@font-face{font-display:block;font-family:KaTeX_AMS;font-style:normal;font-weight:400;src:url(/assets/KaTeX_AMS-Regular-BQhdFMY1.woff2)format("woff2"),url(/assets/KaTeX_AMS-Regular-DMm9YOAa.woff)format("woff"),url(/assets/KaTeX_AMS-Regular-DRggAlZN.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Caligraphic;font-style:normal;font-weight:700;src:url(/assets/KaTeX_Caligraphic-Bold-Dq_IR9rO.woff2)format("woff2"),url(/assets/KaTeX_Caligraphic-Bold-BEiXGLvX.woff)format("woff"),url(/assets/KaTeX_Caligraphic-Bold-ATXxdsX0.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Caligraphic;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Caligraphic-Regular-Di6jR-x-.woff2)format("woff2"),url(/assets/KaTeX_Caligraphic-Regular-CTRA-rTL.woff)format("woff"),url(/assets/KaTeX_Caligraphic-Regular-wX97UBjC.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Fraktur;font-style:normal;font-weight:700;src:url(/assets/KaTeX_Fraktur-Bold-CL6g_b3V.woff2)format("woff2"),url(/assets/KaTeX_Fraktur-Bold-BsDP51OF.woff)format("woff"),url(/assets/KaTeX_Fraktur-Bold-BdnERNNW.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Fraktur;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Fraktur-Regular-CTYiF6lA.woff2)format("woff2"),url(/assets/KaTeX_Fraktur-Regular-Dxdc4cR9.woff)format("woff"),url(/assets/KaTeX_Fraktur-Regular-CB_wures.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:normal;font-weight:700;src:url(/assets/KaTeX_Main-Bold-Cx986IdX.woff2)format("woff2"),url(/assets/KaTeX_Main-Bold-Jm3AIy58.woff)format("woff"),url(/assets/KaTeX_Main-Bold-waoOVXN0.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:italic;font-weight:700;src:url(/assets/KaTeX_Main-BoldItalic-DxDJ3AOS.woff2)format("woff2"),url(/assets/KaTeX_Main-BoldItalic-SpSLRI95.woff)format("woff"),url(/assets/KaTeX_Main-BoldItalic-DzxPMmG6.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:italic;font-weight:400;src:url(/assets/KaTeX_Main-Italic-NWA7e6Wa.woff2)format("woff2"),url(/assets/KaTeX_Main-Italic-BMLOBm91.woff)format("woff"),url(/assets/KaTeX_Main-Italic-3WenGoN9.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Main-Regular-B22Nviop.woff2)format("woff2"),url(/assets/KaTeX_Main-Regular-Dr94JaBh.woff)format("woff"),url(/assets/KaTeX_Main-Regular-ypZvNtVU.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Math;font-style:italic;font-weight:700;src:url(/assets/KaTeX_Math-BoldItalic-CZnvNsCZ.woff2)format("woff2"),url(/assets/KaTeX_Math-BoldItalic-iY-2wyZ7.woff)format("woff"),url(/assets/KaTeX_Math-BoldItalic-B3XSjfu4.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Math;font-style:italic;font-weight:400;src:url(/assets/KaTeX_Math-Italic-t53AETM-.woff2)format("woff2"),url(/assets/KaTeX_Math-Italic-DA0__PXp.woff)format("woff"),url(/assets/KaTeX_Math-Italic-flOr_0UB.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:normal;font-weight:700;src:url(/assets/KaTeX_SansSerif-Bold-D1sUS0GD.woff2)format("woff2"),url(/assets/KaTeX_SansSerif-Bold-DbIhKOiC.woff)format("woff"),url(/assets/KaTeX_SansSerif-Bold-CFMepnvq.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:italic;font-weight:400;src:url(/assets/KaTeX_SansSerif-Italic-C3H0VqGB.woff2)format("woff2"),url(/assets/KaTeX_SansSerif-Italic-DN2j7dab.woff)format("woff"),url(/assets/KaTeX_SansSerif-Italic-YYjJ1zSn.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:normal;font-weight:400;src:url(/assets/KaTeX_SansSerif-Regular-DDBCnlJ7.woff2)format("woff2"),url(/assets/KaTeX_SansSerif-Regular-CS6fqUqJ.woff)format("woff"),url(/assets/KaTeX_SansSerif-Regular-BNo7hRIc.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Script;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Script-Regular-D3wIWfF6.woff2)format("woff2"),url(/assets/KaTeX_Script-Regular-D5yQViql.woff)format("woff"),url(/assets/KaTeX_Script-Regular-C5JkGWo-.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size1;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Size1-Regular-mCD8mA8B.woff2)format("woff2"),url(/assets/KaTeX_Size1-Regular-C195tn64.woff)format("woff"),url(/assets/KaTeX_Size1-Regular-Dbsnue_I.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size2;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Size2-Regular-Dy4dx90m.woff2)format("woff2"),url(/assets/KaTeX_Size2-Regular-oD1tc_U0.woff)format("woff"),url(/assets/KaTeX_Size2-Regular-B7gKUWhC.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size3;font-style:normal;font-weight:400;src:url(data:font/woff2;base64,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)format("woff2"),url(/assets/KaTeX_Size3-Regular-CTq5MqoE.woff)format("woff"),url(/assets/KaTeX_Size3-Regular-DgpXs0kz.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size4;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Size4-Regular-Dl5lxZxV.woff2)format("woff2"),url(/assets/KaTeX_Size4-Regular-BF-4gkZK.woff)format("woff"),url(/assets/KaTeX_Size4-Regular-DWFBv043.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Typewriter;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Typewriter-Regular-CO6r4hn1.woff2)format("woff2"),url(/assets/KaTeX_Typewriter-Regular-C0xS9mPB.woff)format("woff"),url(/assets/KaTeX_Typewriter-Regular-D3Ib7_Hf.ttf)format("truetype")}.katex{text-indent:0;text-rendering:auto;font:1.21em/1.2 KaTeX_Main,Times New Roman,serif;position:relative}.katex *{border-color:currentColor;-ms-high-contrast-adjust:none!important}.katex .katex-version:after{content:"0.16.47"}.katex .katex-mathml{clip-path:inset(50%);border:0;width:1px;height:1px;padding:0;position:absolute;overflow:hidden}.katex .katex-html>.newline{display:block}.katex .base{white-space:nowrap;width:min-content;position:relative}.katex .base,.katex .strut{display:inline-block}.katex .textbf{font-weight:700}.katex .textit{font-style:italic}.katex .textrm{font-family:KaTeX_Main}.katex .textsf{font-family:KaTeX_SansSerif}.katex .texttt{font-family:KaTeX_Typewriter}.katex .mathnormal{font-family:KaTeX_Math;font-style:italic}.katex .mathit{font-family:KaTeX_Main;font-style:italic}.katex .mathrm{font-style:normal}.katex .mathbf{font-family:KaTeX_Main;font-weight:700}.katex .boldsymbol{font-family:KaTeX_Math;font-style:italic;font-weight:700}.katex .amsrm,.katex .mathbb,.katex .textbb{font-family:KaTeX_AMS}.katex .mathcal{font-family:KaTeX_Caligraphic}.katex .mathfrak,.katex .textfrak{font-family:KaTeX_Fraktur}.katex .mathboldfrak,.katex .textboldfrak{font-family:KaTeX_Fraktur;font-weight:700}.katex .mathtt{font-family:KaTeX_Typewriter}.katex .mathscr,.katex .textscr{font-family:KaTeX_Script}.katex .mathsf,.katex .textsf{font-family:KaTeX_SansSerif}.katex .mathboldsf,.katex .textboldsf{font-family:KaTeX_SansSerif;font-weight:700}.katex .mathitsf,.katex .mathsfit,.katex .textitsf{font-family:KaTeX_SansSerif;font-style:italic}.katex .mainrm{font-family:KaTeX_Main;font-style:normal}.katex .vlist-t{border-collapse:collapse;table-layout:fixed;display:inline-table}.katex .vlist-r{display:table-row}.katex .vlist{vertical-align:bottom;display:table-cell;position:relative}.katex .vlist>span{height:0;display:block;position:relative}.katex .vlist>span>span{display:inline-block}.katex .vlist>span>.pstrut{width:0;overflow:hidden}.katex .vlist-t2{margin-right:-2px}.katex .vlist-s{vertical-align:bottom;width:2px;min-width:2px;font-size:1px;display:table-cell}.katex .vbox{flex-direction:column;align-items:baseline;display:inline-flex}.katex .hbox{width:100%}.katex .hbox,.katex .thinbox{flex-direction:row;display:inline-flex}.katex .thinbox{width:0;max-width:0}.katex .msupsub{text-align:left}.katex .mfrac>span>span{text-align:center}.katex .mfrac .frac-line{border-bottom-style:solid;width:100%;display:inline-block}.katex .hdashline,.katex .hline,.katex .mfrac .frac-line,.katex .overline .overline-line,.katex .rule,.katex .underline .underline-line{min-height:1px}.katex .mspace{display:inline-block}.katex .smash{line-height:0;display:inline}.katex .clap,.katex .llap,.katex .rlap{width:0;position:relative}.katex .clap>.inner,.katex .llap>.inner,.katex .rlap>.inner{position:absolute}.katex .clap>.fix,.katex .llap>.fix,.katex .rlap>.fix{display:inline-block}.katex .llap>.inner{right:0}.katex .clap>.inner,.katex .rlap>.inner{left:0}.katex .clap>.inner>span{margin-left:-50%;margin-right:50%}.katex .rule{border:0 solid;display:inline-block;position:relative}.katex .hline,.katex .overline .overline-line,.katex .underline .underline-line{border-bottom-style:solid;width:100%;display:inline-block}.katex .hdashline{border-bottom-style:dashed;width:100%;display:inline-block}.katex .sqrt>.root{margin-left:.277778em;margin-right:-.555556em}.katex .fontsize-ensurer.reset-size1.size1,.katex .sizing.reset-size1.size1{font-size:1em}.katex .fontsize-ensurer.reset-size1.size2,.katex .sizing.reset-size1.size2{font-size:1.2em}.katex .fontsize-ensurer.reset-size1.size3,.katex .sizing.reset-size1.size3{font-size:1.4em}.katex .fontsize-ensurer.reset-size1.size4,.katex .sizing.reset-size1.size4{font-size:1.6em}.katex .fontsize-ensurer.reset-size1.size5,.katex .sizing.reset-size1.size5{font-size:1.8em}.katex .fontsize-ensurer.reset-size1.size6,.katex .sizing.reset-size1.size6{font-size:2em}.katex .fontsize-ensurer.reset-size1.size7,.katex .sizing.reset-size1.size7{font-size:2.4em}.katex .fontsize-ensurer.reset-size1.size8,.katex .sizing.reset-size1.size8{font-size:2.88em}.katex .fontsize-ensurer.reset-size1.size9,.katex .sizing.reset-size1.size9{font-size:3.456em}.katex .fontsize-ensurer.reset-size1.size10,.katex .sizing.reset-size1.size10{font-size:4.148em}.katex .fontsize-ensurer.reset-size1.size11,.katex .sizing.reset-size1.size11{font-size:4.976em}.katex .fontsize-ensurer.reset-size2.size1,.katex .sizing.reset-size2.size1{font-size:.833333em}.katex .fontsize-ensurer.reset-size2.size2,.katex .sizing.reset-size2.size2{font-size:1em}.katex .fontsize-ensurer.reset-size2.size3,.katex .sizing.reset-size2.size3{font-size:1.16667em}.katex .fontsize-ensurer.reset-size2.size4,.katex .sizing.reset-size2.size4{font-size:1.33333em}.katex .fontsize-ensurer.reset-size2.size5,.katex .sizing.reset-size2.size5{font-size:1.5em}.katex .fontsize-ensurer.reset-size2.size6,.katex .sizing.reset-size2.size6{font-size:1.66667em}.katex .fontsize-ensurer.reset-size2.size7,.katex .sizing.reset-size2.size7{font-size:2em}.katex .fontsize-ensurer.reset-size2.size8,.katex .sizing.reset-size2.size8{font-size:2.4em}.katex .fontsize-ensurer.reset-size2.size9,.katex .sizing.reset-size2.size9{font-size:2.88em}.katex .fontsize-ensurer.reset-size2.size10,.katex .sizing.reset-size2.size10{font-size:3.45667em}.katex .fontsize-ensurer.reset-size2.size11,.katex .sizing.reset-size2.size11{font-size:4.14667em}.katex .fontsize-ensurer.reset-size3.size1,.katex .sizing.reset-size3.size1{font-size:.714286em}.katex .fontsize-ensurer.reset-size3.size2,.katex .sizing.reset-size3.size2{font-size:.857143em}.katex .fontsize-ensurer.reset-size3.size3,.katex .sizing.reset-size3.size3{font-size:1em}.katex .fontsize-ensurer.reset-size3.size4,.katex .sizing.reset-size3.size4{font-size:1.14286em}.katex .fontsize-ensurer.reset-size3.size5,.katex .sizing.reset-size3.size5{font-size:1.28571em}.katex .fontsize-ensurer.reset-size3.size6,.katex .sizing.reset-size3.size6{font-size:1.42857em}.katex .fontsize-ensurer.reset-size3.size7,.katex .sizing.reset-size3.size7{font-size:1.71429em}.katex .fontsize-ensurer.reset-size3.size8,.katex .sizing.reset-size3.size8{font-size:2.05714em}.katex .fontsize-ensurer.reset-size3.size9,.katex .sizing.reset-size3.size9{font-size:2.46857em}.katex .fontsize-ensurer.reset-size3.size10,.katex .sizing.reset-size3.size10{font-size:2.96286em}.katex .fontsize-ensurer.reset-size3.size11,.katex .sizing.reset-size3.size11{font-size:3.55429em}.katex .fontsize-ensurer.reset-size4.size1,.katex .sizing.reset-size4.size1{font-size:.625em}.katex .fontsize-ensurer.reset-size4.size2,.katex .sizing.reset-size4.size2{font-size:.75em}.katex .fontsize-ensurer.reset-size4.size3,.katex .sizing.reset-size4.size3{font-size:.875em}.katex .fontsize-ensurer.reset-size4.size4,.katex .sizing.reset-size4.size4{font-size:1em}.katex .fontsize-ensurer.reset-size4.size5,.katex .sizing.reset-size4.size5{font-size:1.125em}.katex .fontsize-ensurer.reset-size4.size6,.katex .sizing.reset-size4.size6{font-size:1.25em}.katex .fontsize-ensurer.reset-size4.size7,.katex .sizing.reset-size4.size7{font-size:1.5em}.katex .fontsize-ensurer.reset-size4.size8,.katex .sizing.reset-size4.size8{font-size:1.8em}.katex .fontsize-ensurer.reset-size4.size9,.katex .sizing.reset-size4.size9{font-size:2.16em}.katex .fontsize-ensurer.reset-size4.size10,.katex .sizing.reset-size4.size10{font-size:2.5925em}.katex .fontsize-ensurer.reset-size4.size11,.katex .sizing.reset-size4.size11{font-size:3.11em}.katex .fontsize-ensurer.reset-size5.size1,.katex .sizing.reset-size5.size1{font-size:.555556em}.katex .fontsize-ensurer.reset-size5.size2,.katex .sizing.reset-size5.size2{font-size:.666667em}.katex .fontsize-ensurer.reset-size5.size3,.katex .sizing.reset-size5.size3{font-size:.777778em}.katex .fontsize-ensurer.reset-size5.size4,.katex .sizing.reset-size5.size4{font-size:.888889em}.katex .fontsize-ensurer.reset-size5.size5,.katex .sizing.reset-size5.size5{font-size:1em}.katex .fontsize-ensurer.reset-size5.size6,.katex .sizing.reset-size5.size6{font-size:1.11111em}.katex .fontsize-ensurer.reset-size5.size7,.katex .sizing.reset-size5.size7{font-size:1.33333em}.katex .fontsize-ensurer.reset-size5.size8,.katex .sizing.reset-size5.size8{font-size:1.6em}.katex .fontsize-ensurer.reset-size5.size9,.katex .sizing.reset-size5.size9{font-size:1.92em}.katex .fontsize-ensurer.reset-size5.size10,.katex .sizing.reset-size5.size10{font-size:2.30444em}.katex .fontsize-ensurer.reset-size5.size11,.katex .sizing.reset-size5.size11{font-size:2.76444em}.katex .fontsize-ensurer.reset-size6.size1,.katex .sizing.reset-size6.size1{font-size:.5em}.katex .fontsize-ensurer.reset-size6.size2,.katex .sizing.reset-size6.size2{font-size:.6em}.katex .fontsize-ensurer.reset-size6.size3,.katex .sizing.reset-size6.size3{font-size:.7em}.katex .fontsize-ensurer.reset-size6.size4,.katex .sizing.reset-size6.size4{font-size:.8em}.katex .fontsize-ensurer.reset-size6.size5,.katex .sizing.reset-size6.size5{font-size:.9em}.katex .fontsize-ensurer.reset-size6.size6,.katex .sizing.reset-size6.size6{font-size:1em}.katex .fontsize-ensurer.reset-size6.size7,.katex .sizing.reset-size6.size7{font-size:1.2em}.katex .fontsize-ensurer.reset-size6.size8,.katex .sizing.reset-size6.size8{font-size:1.44em}.katex .fontsize-ensurer.reset-size6.size9,.katex .sizing.reset-size6.size9{font-size:1.728em}.katex .fontsize-ensurer.reset-size6.size10,.katex .sizing.reset-size6.size10{font-size:2.074em}.katex .fontsize-ensurer.reset-size6.size11,.katex .sizing.reset-size6.size11{font-size:2.488em}.katex .fontsize-ensurer.reset-size7.size1,.katex .sizing.reset-size7.size1{font-size:.416667em}.katex .fontsize-ensurer.reset-size7.size2,.katex .sizing.reset-size7.size2{font-size:.5em}.katex .fontsize-ensurer.reset-size7.size3,.katex .sizing.reset-size7.size3{font-size:.583333em}.katex .fontsize-ensurer.reset-size7.size4,.katex .sizing.reset-size7.size4{font-size:.666667em}.katex .fontsize-ensurer.reset-size7.size5,.katex .sizing.reset-size7.size5{font-size:.75em}.katex .fontsize-ensurer.reset-size7.size6,.katex .sizing.reset-size7.size6{font-size:.833333em}.katex .fontsize-ensurer.reset-size7.size7,.katex .sizing.reset-size7.size7{font-size:1em}.katex .fontsize-ensurer.reset-size7.size8,.katex .sizing.reset-size7.size8{font-size:1.2em}.katex .fontsize-ensurer.reset-size7.size9,.katex .sizing.reset-size7.size9{font-size:1.44em}.katex .fontsize-ensurer.reset-size7.size10,.katex .sizing.reset-size7.size10{font-size:1.72833em}.katex .fontsize-ensurer.reset-size7.size11,.katex .sizing.reset-size7.size11{font-size:2.07333em}.katex .fontsize-ensurer.reset-size8.size1,.katex .sizing.reset-size8.size1{font-size:.347222em}.katex .fontsize-ensurer.reset-size8.size2,.katex .sizing.reset-size8.size2{font-size:.416667em}.katex .fontsize-ensurer.reset-size8.size3,.katex .sizing.reset-size8.size3{font-size:.486111em}.katex .fontsize-ensurer.reset-size8.size4,.katex .sizing.reset-size8.size4{font-size:.555556em}.katex .fontsize-ensurer.reset-size8.size5,.katex .sizing.reset-size8.size5{font-size:.625em}.katex .fontsize-ensurer.reset-size8.size6,.katex .sizing.reset-size8.size6{font-size:.694444em}.katex .fontsize-ensurer.reset-size8.size7,.katex .sizing.reset-size8.size7{font-size:.833333em}.katex .fontsize-ensurer.reset-size8.size8,.katex .sizing.reset-size8.size8{font-size:1em}.katex .fontsize-ensurer.reset-size8.size9,.katex .sizing.reset-size8.size9{font-size:1.2em}.katex .fontsize-ensurer.reset-size8.size10,.katex .sizing.reset-size8.size10{font-size:1.44028em}.katex .fontsize-ensurer.reset-size8.size11,.katex .sizing.reset-size8.size11{font-size:1.72778em}.katex .fontsize-ensurer.reset-size9.size1,.katex .sizing.reset-size9.size1{font-size:.289352em}.katex .fontsize-ensurer.reset-size9.size2,.katex .sizing.reset-size9.size2{font-size:.347222em}.katex .fontsize-ensurer.reset-size9.size3,.katex .sizing.reset-size9.size3{font-size:.405093em}.katex .fontsize-ensurer.reset-size9.size4,.katex .sizing.reset-size9.size4{font-size:.462963em}.katex .fontsize-ensurer.reset-size9.size5,.katex .sizing.reset-size9.size5{font-size:.520833em}.katex .fontsize-ensurer.reset-size9.size6,.katex .sizing.reset-size9.size6{font-size:.578704em}.katex .fontsize-ensurer.reset-size9.size7,.katex .sizing.reset-size9.size7{font-size:.694444em}.katex .fontsize-ensurer.reset-size9.size8,.katex .sizing.reset-size9.size8{font-size:.833333em}.katex .fontsize-ensurer.reset-size9.size9,.katex .sizing.reset-size9.size9{font-size:1em}.katex .fontsize-ensurer.reset-size9.size10,.katex .sizing.reset-size9.size10{font-size:1.20023em}.katex .fontsize-ensurer.reset-size9.size11,.katex .sizing.reset-size9.size11{font-size:1.43981em}.katex .fontsize-ensurer.reset-size10.size1,.katex .sizing.reset-size10.size1{font-size:.24108em}.katex .fontsize-ensurer.reset-size10.size2,.katex .sizing.reset-size10.size2{font-size:.289296em}.katex .fontsize-ensurer.reset-size10.size3,.katex .sizing.reset-size10.size3{font-size:.337512em}.katex .fontsize-ensurer.reset-size10.size4,.katex .sizing.reset-size10.size4{font-size:.385728em}.katex .fontsize-ensurer.reset-size10.size5,.katex .sizing.reset-size10.size5{font-size:.433944em}.katex .fontsize-ensurer.reset-size10.size6,.katex .sizing.reset-size10.size6{font-size:.48216em}.katex .fontsize-ensurer.reset-size10.size7,.katex .sizing.reset-size10.size7{font-size:.578592em}.katex .fontsize-ensurer.reset-size10.size8,.katex .sizing.reset-size10.size8{font-size:.694311em}.katex .fontsize-ensurer.reset-size10.size9,.katex .sizing.reset-size10.size9{font-size:.833173em}.katex .fontsize-ensurer.reset-size10.size10,.katex .sizing.reset-size10.size10{font-size:1em}.katex .fontsize-ensurer.reset-size10.size11,.katex .sizing.reset-size10.size11{font-size:1.19961em}.katex .fontsize-ensurer.reset-size11.size1,.katex .sizing.reset-size11.size1{font-size:.200965em}.katex .fontsize-ensurer.reset-size11.size2,.katex .sizing.reset-size11.size2{font-size:.241158em}.katex .fontsize-ensurer.reset-size11.size3,.katex .sizing.reset-size11.size3{font-size:.281351em}.katex .fontsize-ensurer.reset-size11.size4,.katex .sizing.reset-size11.size4{font-size:.321543em}.katex .fontsize-ensurer.reset-size11.size5,.katex .sizing.reset-size11.size5{font-size:.361736em}.katex .fontsize-ensurer.reset-size11.size6,.katex .sizing.reset-size11.size6{font-size:.401929em}.katex .fontsize-ensurer.reset-size11.size7,.katex .sizing.reset-size11.size7{font-size:.482315em}.katex .fontsize-ensurer.reset-size11.size8,.katex .sizing.reset-size11.size8{font-size:.578778em}.katex .fontsize-ensurer.reset-size11.size9,.katex .sizing.reset-size11.size9{font-size:.694534em}.katex .fontsize-ensurer.reset-size11.size10,.katex .sizing.reset-size11.size10{font-size:.833601em}.katex .fontsize-ensurer.reset-size11.size11,.katex .sizing.reset-size11.size11{font-size:1em}.katex .delimsizing.size1{font-family:KaTeX_Size1}.katex .delimsizing.size2{font-family:KaTeX_Size2}.katex .delimsizing.size3{font-family:KaTeX_Size3}.katex .delimsizing.size4{font-family:KaTeX_Size4}.katex .delimsizing.mult .delim-size1>span{font-family:KaTeX_Size1}.katex .delimsizing.mult .delim-size4>span{font-family:KaTeX_Size4}.katex .nulldelimiter{width:.12em;display:inline-block}.katex .delimcenter,.katex .op-symbol{position:relative}.katex .op-symbol.small-op{font-family:KaTeX_Size1}.katex .op-symbol.large-op{font-family:KaTeX_Size2}.katex .accent>.vlist-t,.katex .op-limits>.vlist-t{text-align:center}.katex .accent .accent-body{position:relative}.katex .accent .accent-body:not(.accent-full){width:0}.katex .overlay{display:block}.katex .mtable .vertical-separator{min-width:1px;display:inline-block}.katex .mtable .arraycolsep{display:inline-block}.katex .mtable .col-align-c>.vlist-t{text-align:center}.katex .mtable .col-align-l>.vlist-t{text-align:left}.katex .mtable .col-align-r>.vlist-t{text-align:right}.katex .svg-align{text-align:left}.katex svg{fill:currentColor;stroke:currentColor;height:inherit;width:100%;display:block;position:absolute}.katex svg path{stroke:none}.katex svg{fill-rule:nonzero;fill-opacity:1;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1}.katex img{border-style:none;min-width:0;max-width:none;min-height:0;max-height:none}.katex .stretchy{width:100%;display:block;position:relative;overflow:hidden}.katex .stretchy:after,.katex .stretchy:before{content:""}.katex .hide-tail{width:100%;position:relative;overflow:hidden}.katex .halfarrow-left{width:50.2%;position:absolute;left:0;overflow:hidden}.katex .halfarrow-right{width:50.2%;position:absolute;right:0;overflow:hidden}.katex .brace-left{width:25.1%;position:absolute;left:0;overflow:hidden}.katex .brace-center{width:50%;position:absolute;left:25%;overflow:hidden}.katex .brace-right{width:25.1%;position:absolute;right:0;overflow:hidden}.katex .x-arrow-pad{padding:0 .5em}.katex .cd-arrow-pad{padding:0 .55556em 0 .27778em}.katex .mover,.katex .munder,.katex .x-arrow{text-align:center}.katex .boxpad{padding:0 .3em}.katex .fbox,.katex .fcolorbox{box-sizing:border-box;border:.04em solid}.katex .cancel-pad{padding:0 .2em}.katex .cancel-lap{margin-left:-.2em;margin-right:-.2em}.katex .sout{border-bottom-style:solid;border-bottom-width:.08em}.katex .angl{box-sizing:border-box;border-top:.049em solid;border-right:.049em solid;margin-right:.03889em}.katex .anglpad{padding:0 .03889em}.katex .eqn-num:before{content:"(" counter(katexEqnNo) ")";counter-increment:katexEqnNo}.katex .mml-eqn-num:before{content:"(" counter(mmlEqnNo) ")";counter-increment:mmlEqnNo}.katex .mtr-glue{width:50%}.katex .cd-vert-arrow{display:inline-block;position:relative}.katex .cd-label-left{text-align:left;display:inline-block;position:absolute;right:calc(50% + .3em)}.katex .cd-label-right{text-align:right;display:inline-block;position:absolute;left:calc(50% + .3em)}.katex-display{text-align:center;margin:1em 0;display:block}.katex-display>.katex{text-align:center;white-space:nowrap;display:block}.katex-display>.katex>.katex-html{display:block;position:relative}.katex-display>.katex>.katex-html>.tag{position:absolute;right:0}.katex-display.leqno>.katex>.katex-html>.tag{left:0;right:auto}.katex-display.fleqn>.katex{text-align:left;padding-left:2em}body{counter-reset:katexEqnNo mmlEqnNo}.jxgbox{-ms-touch-action:none;background-color:#fff;border:1px solid #356aa0;border-radius:10px;margin:0;position:relative;overflow:hidden}.jxgbox svg text{cursor:default;-webkit-user-select:none;user-select:none}.JXGtext{background-color:#0000;margin:0;padding:0;font-family:Courier,monospace}.JXGinfobox{border:0 #000}.jxgbox :focus{outline-width:.5px;outline-style:dotted}.JXG_navigation{z-index:100;cursor:pointer;background-color:#0000;padding:2px;font-size:14px;position:absolute;bottom:5px;right:5px}.JXG_navigation_button{color:#666}.JXG_navigation_button:hover{background:#b8b8b880;border-radius:2px}.JXG_navigation_button svg{padding:0;position:relative;top:.2em}.JXG_wrap_private:fullscreen{background-color:#ccc;width:100%;height:100%;padding:0}.JXG_wrap_private:fullscreen{background-color:#ccc;width:100%;height:100%;padding:0}.smart-label-solid{color:#fff;text-align:center;vertical-align:middle;border-radius:150px;margin:0;padding:1px 7px}.smart-label-outline{color:#000;text-align:center;vertical-align:middle;background-color:#fff;border:2px solid #000;border-radius:15px;margin:0;padding:1px 7px}.smart-label-pure{color:#000;text-align:center;vertical-align:middle;background-color:#0000;border:none;border-radius:15px;margin:0;padding:20px 7px 1px}.smart-label-line,.smart-label-point{background-color:#0072b2;border-color:#0072b2}.smart-label-point{margin-top:12px}.smart-label-angle{background-color:#e69f00;border-color:#e69f00;padding:1px 7px}.smart-label-polygon,.smart-label-circle{color:#000;background-color:#f0e442;border-color:#f0e442;padding:1px 7px}@layer properties{@supports (((-webkit-hyphens:none)) and (not (margin-trim:inline))) or ((-moz-orient:inline) and (not (color:rgb(from red r g b)))){*,:before,:after,::backdrop{--tw-rotate-x:initial;--tw-rotate-y:initial;--tw-rotate-z:initial;--tw-skew-x:initial;--tw-skew-y:initial;--tw-border-style:solid;--tw-outline-style:solid;--tw-blur:initial;--tw-brightness:initial;--tw-contrast:initial;--tw-grayscale:initial;--tw-hue-rotate:initial;--tw-invert:initial;--tw-opacity:initial;--tw-saturate:initial;--tw-sepia:initial;--tw-drop-shadow:initial;--tw-drop-shadow-color:initial;--tw-drop-shadow-alpha:100%;--tw-drop-shadow-size:initial}}}@layer theme{:root,:host{--font-sans:ui-sans-serif, system-ui, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";--font-mono:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;--spacing:.25rem;--radius-lg:.5rem;--shadow-sm:0 1px 3px 0 #0000001a, 0 1px 2px -1px #0000001a;--shadow-md:0 4px 6px -1px #0000001a, 0 2px 4px -2px #0000001a;--default-transition-duration:.15s;--default-transition-timing-function:cubic-bezier(.4, 0, .2, 1);--default-font-family:var(--font-sans);--default-mono-font-family:var(--font-mono)}}@layer base{*,:after,:before,::backdrop{box-sizing:border-box;border:0 solid;margin:0;padding:0}::file-selector-button{box-sizing:border-box;border:0 solid;margin:0;padding:0}html,:host{-webkit-text-size-adjust:100%;tab-size:4;line-height:1.5;font-family:var(--default-font-family,ui-sans-serif, system-ui, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji");font-feature-settings:var(--default-font-feature-settings,normal);font-variation-settings:var(--default-font-variation-settings,normal);-webkit-tap-highlight-color:transparent}hr{height:0;color:inherit;border-top-width:1px}abbr:where([title]){-webkit-text-decoration:underline dotted;text-decoration:underline dotted}h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}a{color:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,samp,pre{font-family:var(--default-mono-font-family,ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace);font-feature-settings:var(--default-mono-font-feature-settings,normal);font-variation-settings:var(--default-mono-font-variation-settings,normal);font-size:1em}small{font-size:80%}sub,sup{vertical-align:baseline;font-size:75%;line-height:0;position:relative}sub{bottom:-.25em}sup{top:-.5em}table{text-indent:0;border-color:inherit;border-collapse:collapse}:-moz-focusring{outline:auto}progress{vertical-align:baseline}summary{display:list-item}ol,ul,menu{list-style:none}img,svg,video,canvas,audio,iframe,embed,object{vertical-align:middle;display:block}img,video{max-width:100%;height:auto}button,input,select,optgroup,textarea{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}::file-selector-button{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}:where(select:is([multiple],[size])) optgroup{font-weight:bolder}:where(select:is([multiple],[size])) optgroup option{padding-inline-start:20px}::file-selector-button{margin-inline-end:4px}::placeholder{opacity:1}@supports (not ((-webkit-appearance:-apple-pay-button))) or (contain-intrinsic-size:1px){::placeholder{color:currentColor}@supports (color:color-mix(in lab, red, red)){::placeholder{color:color-mix(in oklab, currentcolor 50%, transparent)}}}textarea{resize:vertical}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-date-and-time-value{min-height:1lh;text-align:inherit}::-webkit-datetime-edit{display:inline-flex}::-webkit-datetime-edit-fields-wrapper{padding:0}::-webkit-datetime-edit{padding-block:0}::-webkit-datetime-edit-year-field{padding-block:0}::-webkit-datetime-edit-month-field{padding-block:0}::-webkit-datetime-edit-day-field{padding-block:0}::-webkit-datetime-edit-hour-field{padding-block:0}::-webkit-datetime-edit-minute-field{padding-block:0}::-webkit-datetime-edit-second-field{padding-block:0}::-webkit-datetime-edit-millisecond-field{padding-block:0}::-webkit-datetime-edit-meridiem-field{padding-block:0}::-webkit-calendar-picker-indicator{line-height:1}:-moz-ui-invalid{box-shadow:none}button,input:where([type=button],[type=reset],[type=submit]){appearance:button}::file-selector-button{appearance:button}::-webkit-inner-spin-button{height:auto}::-webkit-outer-spin-button{height:auto}[hidden]:where(:not([hidden=until-found])){display:none!important}}@layer components;@layer utilities{.collapse{visibility:collapse}.visible{visibility:visible}.sr-only{clip-path:inset(50%);white-space:nowrap;border-width:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.absolute{position:absolute}.fixed{position:fixed}.relative{position:relative}.static{position:static}.start{inset-inline-start:var(--spacing)}.end{inset-inline-end:var(--spacing)}.z-1{z-index:1}.block{display:block}.contents{display:contents}.flex{display:flex}.grid{display:grid}.hidden{display:none}.inline{display:inline}.table{display:table}.h-28{height:calc(var(--spacing) * 28)}.border-collapse{border-collapse:collapse}.transform{transform:var(--tw-rotate-x,) var(--tw-rotate-y,) var(--tw-rotate-z,) var(--tw-skew-x,) var(--tw-skew-y,)}.flex-wrap{flex-wrap:wrap}.rounded{border-radius:.25rem}.border{border-style:var(--tw-border-style);border-width:1px}.lowercase{text-transform:lowercase}.italic{font-style:italic}.underline{text-decoration-line:underline}.outline{outline-style:var(--tw-outline-style);outline-width:1px}.filter{filter:var(--tw-blur,) var(--tw-brightness,) var(--tw-contrast,) var(--tw-grayscale,) var(--tw-hue-rotate,) var(--tw-invert,) var(--tw-saturate,) var(--tw-sepia,) var(--tw-drop-shadow,)}.transition{transition-property:color,background-color,border-color,outline-color,text-decoration-color,fill,stroke,--tw-gradient-from,--tw-gradient-via,--tw-gradient-to,opacity,box-shadow,transform,translate,scale,rotate,filter,-webkit-backdrop-filter,backdrop-filter,display,content-visibility,overlay,pointer-events;transition-timing-function:var(--tw-ease,var(--default-transition-timing-function));transition-duration:var(--tw-duration,var(--default-transition-duration))}}:root{--navy-950:#0d0828;--navy-900:#130a3a;--navy-800:#1d1252;--violet-800:#5b21b6;--violet-700:#6930df;--violet-600:#7c3aed;--violet-500:#8b5cf6;--violet-400:#a78bfa;--violet-300:#c4b5fd;--violet-200:#ddd6fe;--violet-100:#ede9fe;--violet-50:#f5f3ff;--teal-600:#0d9488;--teal-500:#14b8a6;--teal-100:#ccfbf1;--coral-900:#831843;--coral-700:#be185d;--coral-600:#e11d65;--coral-500:#f43f78;--coral-100:#fce7f3;--blue-600:#4f46e5;--blue-100:#e0e7ff;--amber-500:#f59e0b;--green-900:#14532d;--green-700:#15803d;--green-600:#16a34a;--green-500:#22c55e;--green-300:#86efac;--green-100:#dcfce7;--ink:#14112d;--ink-soft:#55516b;--ink-faint:#827d99;--line:#e8e6f1;--line-strong:#ded9ec;--surface:#fff;--surface-soft:#f7f7fb;--surface-violet:#faf8ff;--page:#f5f5fa;--shadow-sm:0 8px 26px #2c1e5512;--shadow-md:0 22px 60px #2d1b5e1c;--shadow-violet:0 18px 48px #7c3aed47;--radius-sm:12px;--radius:18px;--radius-lg:26px}*{box-sizing:border-box}html{scroll-behavior:smooth;background:var(--page)}body{color:var(--ink);background:var(--page);-webkit-font-smoothing:antialiased;margin:0;font-family:Inter,Segoe UI,Roboto,Helvetica,Arial,Noto Sans Arabic,sans-serif}button,input,select,textarea{color:inherit;font:inherit}button,a{-webkit-tap-highlight-color:transparent}a{color:inherit;text-decoration:none}button{border:0}button:not(:disabled),a{cursor:pointer}h1,h2,h3,p{margin-top:0}::selection{color:#fff;background:var(--violet-600)}:focus-visible{outline-offset:3px;outline:3px solid #8b5cf6a6}.site-root{min-height:100vh;color:var(--ink);background:var(--page);transition:color .25s,background .25s}.site-root.theme-dark{--ink:#f8f7ff;--ink-soft:#c3bed7;--ink-faint:#918aa9;--line:#33265d;--line-strong:#45326f;--surface:#18102f;--surface-soft:#21163c;--surface-violet:#1e1438;--page:#0d0921;--shadow-sm:0 8px 26px #00000038;--shadow-md:0 22px 60px #0000004d}.skip-link{z-index:999;color:#fff;background:var(--violet-600);border-radius:8px;padding:10px 14px;transition:transform .2s;position:fixed;top:12px;left:12px;transform:translateY(-150%)}.skip-link:focus{transform:translateY(0)}.brand{color:var(--ink);letter-spacing:-.04em;align-items:center;gap:9px;font-size:16px;font-weight:800;display:inline-flex}.brand-light{color:#fff}.brand-logo{object-fit:contain;flex:none;width:112px;height:auto;display:block}.brand-logo-icon{width:34px;height:34px}.brand-compact{gap:0}.brand-mark{color:#fff;background:linear-gradient(135deg, var(--violet-400), var(--violet-700));border-radius:10px;place-items:center;width:34px;height:34px;display:grid;box-shadow:0 7px 18px #7c3aed4d}.brand-compact .brand-mark{width:32px;height:32px}.button{border:1px solid #0000;border-radius:12px;justify-content:center;align-items:center;gap:9px;min-height:43px;padding:0 18px;font-size:14px;font-weight:750;line-height:1;transition:transform .2s,border-color .2s,background .2s,box-shadow .2s;display:inline-flex}.button:hover{transform:translateY(-2px)}.button-lg{border-radius:14px;min-height:50px;padding:0 23px}.button-primary{color:#fff;background:linear-gradient(135deg,#8b5cf6 0%,#6d28d9 100%);box-shadow:0 12px 30px #7c3aed40}.button-primary:hover{box-shadow:0 17px 36px #7c3aed57}.button-secondary{color:var(--violet-700);border-color:var(--line-strong);background:var(--surface)}.theme-dark .button-secondary{color:var(--violet-400)}.button-ghost-light{color:#fff;background:#ffffff0a;border-color:#ffffff3d}.button-white{color:var(--navy-900);background:#fff;box-shadow:0 12px 28px #0f08333d}.button-full{width:100%}.icon-button{border:1px solid var(--line);width:40px;height:40px;color:var(--ink-soft);background:var(--surface);border-radius:11px;flex:none;place-items:center;transition:color .2s,border-color .2s,background .2s;display:grid}.icon-button:hover{color:var(--violet-600);border-color:var(--violet-400)}.language-toggle{border:1px solid var(--line);min-height:40px;color:var(--ink-soft);background:var(--surface);cursor:pointer;border-radius:11px;align-items:center;gap:6px;padding:0 11px;font-size:12px;font-weight:750;transition:color .2s,border-color .2s,background .2s;display:inline-flex}.language-toggle:hover{color:var(--violet-600);border-color:var(--violet-400)}.language-toggle .lang-chevron{transition:transform .2s}.language-toggle .lang-chevron.open{transform:rotate(180deg)}.language-toggle-subtle,button.language-toggle.language-toggle-subtle{-webkit-backdrop-filter:blur(10px);color:#fff!important;background:#ffffff1a!important;border-color:#fff3!important}.language-toggle-subtle:hover,button.language-toggle.language-toggle-subtle:hover{color:#fff!important;background:#ffffff2e!important;border-color:#fff6!important}.language-toggle-subtle *,button.language-toggle.language-toggle-subtle *{color:#fff!important;stroke:#fff!important}.language-dropdown{background:var(--surface);border:1px solid var(--line);z-index:200;border-radius:14px;flex-direction:column;gap:2px;min-width:150px;padding:6px;display:flex;position:absolute;top:calc(100% + 8px);right:0;box-shadow:0 8px 24px #0000001f}.language-toggle-wrapper:has(.language-toggle-subtle) .language-dropdown{background:#1e1b4b;border-color:#a78bfa40;box-shadow:0 12px 32px #00000073}.language-dropdown-item{width:100%;color:var(--ink-soft);cursor:pointer;background:0 0;border:none;border-radius:9px;align-items:center;gap:8px;padding:9px 12px;font-size:13px;font-weight:550;transition:background .15s,color .15s;display:flex}.language-dropdown-item small{opacity:.5;margin-inline-start:auto;font-size:11px;font-weight:700}.language-dropdown-item:hover{background:var(--violet-100);color:var(--violet-700)}.language-dropdown-item.active{background:var(--violet-100);color:var(--violet-600);font-weight:650}.language-toggle-wrapper:has(.language-toggle-subtle) .language-dropdown-item{color:#ffffffb3}.language-toggle-wrapper:has(.language-toggle-subtle) .language-dropdown-item:hover{color:#fff;background:#ffffff1a}.language-toggle-wrapper:has(.language-toggle-subtle) .language-dropdown-item.active{color:#c4b5fd;background:#7c3aed4d}.eyebrow{color:var(--violet-600);letter-spacing:.13em;text-transform:uppercase;margin-bottom:12px;font-size:11px;font-weight:800;display:inline-block}.hero-eyebrow{color:#c4b5fd}.card-kicker{color:var(--ink-faint);letter-spacing:.07em;text-transform:uppercase;margin-bottom:7px;font-size:11px;font-weight:750;display:block}.status-chip{color:#ddd6fe;background:#7c3aed33;border:1px solid #a78bfa40;border-radius:999px;align-items:center;gap:6px;width:fit-content;min-height:27px;padding:0 9px;font-size:10px;font-weight:750;display:inline-flex}.status-chip.success{color:var(--green-600);background:var(--green-100);border-color:#22c55e40}.status-chip.coral{color:var(--coral-600);background:var(--coral-100);border-color:#f43f7833}.landing{color:var(--ink);background:#fff;overflow:hidden}.theme-dark .landing{background:var(--page)}.landing-hero{color:#fff;background:radial-gradient(circle at 77% 30%,#7c3aed6e,#0000 27%),radial-gradient(circle at 12% 100%,#4c1d95b3,#0000 38%),linear-gradient(135deg,#0d0728 0%,#13083f 48%,#27105d 100%);min-height:760px;position:relative;overflow:hidden}.landing-hero:before{content:"";background-image:linear-gradient(#ffffff06 1px,#0000 1px),linear-gradient(90deg,#ffffff06 1px,#0000 1px);background-size:52px 52px;position:absolute;inset:0;-webkit-mask-image:linear-gradient(#000,#0000 90%);mask-image:linear-gradient(#000,#0000 90%)}.hero-orb{filter:blur(80px);pointer-events:none;border-radius:999px;position:absolute}.hero-orb-one{background:#8b5cf647;width:280px;height:280px;top:90px;right:10%}.hero-orb-two{background:#4c1d9552;width:330px;height:230px;bottom:-80px;left:24%}.landing-nav{z-index:5;justify-content:space-between;align-items:center;width:min(1200px,100% - 48px);min-height:82px;margin:0 auto;display:flex;position:relative}.landing-links{color:#ffffffad;align-items:center;gap:30px;font-size:12px;font-weight:650;display:flex}.landing-links a:hover{color:#fff}.landing-actions{align-items:center;gap:9px;display:flex}.nav-signin{color:#fff;background:linear-gradient(135deg,#8b5cf6,#6d28d9);border-radius:11px;align-items:center;min-height:40px;padding:0 16px;font-size:12px;font-weight:750;display:inline-flex;box-shadow:0 9px 24px #7c3aed47}.hero-theme{color:#fff;background:#ffffff0d;border-color:#ffffff24}.hero-grid{z-index:2;grid-template-columns:minmax(0,.92fr) minmax(460px,1.08fr);align-items:center;gap:70px;width:min(1200px,100% - 48px);margin:0 auto;padding:92px 0 86px;display:grid;position:relative}.hero-copy{max-width:580px}.hero-copy h1{letter-spacing:-.064em;margin-bottom:24px;font-size:clamp(48px,5.4vw,76px);line-height:.98}.hero-copy h1 span{color:#a78bfa}.hero-copy>p{color:#ffffffb8;max-width:560px;margin-bottom:31px;font-size:17px;line-height:1.72}.hero-ctas{flex-wrap:wrap;gap:12px;display:flex}.hero-proof{color:#ffffff9e;flex-wrap:wrap;gap:12px 24px;margin-top:34px;font-size:11px;display:flex}.hero-proof span{align-items:center;gap:6px;display:inline-flex}.hero-proof svg{color:#5eead4}.hero-preview{min-height:472px;position:relative}.preview-window{z-index:2;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);background:#0c0825e0;border:1px solid #ffffff26;border-radius:24px;width:min(530px,100%);position:absolute;top:46px;right:3%;overflow:hidden;transform:perspective(1200px)rotateY(-4deg)rotateX(1deg);box-shadow:0 36px 100px #0000006b,0 0 70px #7c3aed33}.preview-topbar{border-bottom:1px solid #ffffff14;justify-content:space-between;align-items:center;min-height:52px;padding:0 17px;display:flex}.preview-topbar .brand-logo-icon{width:26px;height:26px}.preview-dots{gap:5px;display:flex}.preview-dots span{background:#ffffff42;border-radius:50%;width:5px;height:5px}.preview-body{min-height:348px;display:flex}.preview-rail{border-right:1px solid #ffffff14;flex-direction:column;align-items:center;gap:13px;width:54px;padding-top:19px;display:flex}.preview-rail span{color:#ffffff61;border-radius:8px;place-items:center;width:29px;height:29px;display:grid}.preview-rail span.active{color:#fff;background:var(--violet-600)}.preview-content{flex:1;padding:22px}.preview-welcome{flex-direction:column;gap:3px;display:flex}.preview-welcome span{color:#a78bfa;text-transform:uppercase;font-size:8px}.preview-welcome strong{font-size:16px}.preview-mastery{background:linear-gradient(135deg,#7c3aed2e,#ffffff08);border:1px solid #ffffff14;border-radius:14px;align-items:center;gap:15px;margin-top:17px;padding:15px;display:flex}.mini-ring{background:conic-gradient(#5eead4 0%, #ffffff17 0);border-radius:50%;place-items:center;width:56px;height:56px;display:grid}.mini-ring:before{content:"";background:#1b1047;border-radius:50%;width:43px;height:43px;position:absolute}.mini-ring span{z-index:1;font-size:11px;font-weight:800}.preview-mastery>div:last-child{flex-direction:column;display:flex}.preview-mastery small{color:#ffffff7a;font-size:8px}.preview-mastery strong{margin:3px 0;font-size:17px}.preview-mastery em{color:#c4b5fd;font-size:8px;font-style:normal}.preview-cards{grid-template-columns:repeat(3,1fr);gap:8px;margin-top:13px;display:grid}.preview-cards span{color:#ffffffb8;background:#ffffff08;border:1px solid #ffffff14;border-radius:11px;flex-direction:column;justify-content:space-between;min-height:70px;padding:11px;font-size:8px;display:flex}.preview-cards span:nth-child(2) svg{color:#5eead4}.preview-cards span:nth-child(3) svg{color:#f9a8d4}.preview-next{background:#7c3aed1f;border:1px solid #a78bfa4d;border-radius:12px;align-items:center;gap:10px;margin-top:13px;padding:11px 13px;display:flex}.preview-next>svg:first-child{color:#a78bfa}.preview-next div{flex-direction:column;flex:1;gap:2px;display:flex}.preview-next small{color:#ffffff6e;font-size:7px}.preview-next strong{font-size:9px}.formula-chip{z-index:4;color:#ddd6fe;-webkit-backdrop-filter:blur(13px);backdrop-filter:blur(13px);background:linear-gradient(135deg,#7c3aed61,#ffffff12);border:1px solid #ffffff2e;border-radius:13px;padding:12px 17px;font-family:Georgia,serif;position:absolute;box-shadow:0 18px 42px #0000003d}.formula-one{top:3px;right:20px;transform:rotate(4deg)}.formula-two{z-index:5;bottom:10px;right:-12px;transform:rotate(-4deg)}.section{width:min(1160px,100% - 48px);margin:0 auto;padding:105px 0}.section-heading h2,.product-story-copy h2,.final-cta h2{letter-spacing:-.048em;margin-bottom:0;font-size:clamp(32px,4vw,52px);line-height:1.08}.split-heading{grid-template-columns:1.1fr .9fr;align-items:end;gap:90px;margin-bottom:42px;display:grid}.split-heading p,.product-story-copy>p{color:var(--ink-soft);margin-bottom:0;line-height:1.75}.centered{text-align:center;max-width:720px;margin:0 auto 48px}.compact-heading{max-width:760px}.benefit-grid{grid-template-columns:repeat(4,1fr);gap:15px;display:grid}.benefit-card{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);min-height:250px;box-shadow:var(--shadow-sm);padding:28px}.icon-tile,.subject-icon,.continue-icon,.quick-icon,.objective-icon,.auth-icon,.setup-icon,.step-icon{border-radius:13px;place-items:center;width:44px;height:44px;display:grid}.tile-1,.tone-violet{color:var(--violet-600);background:var(--violet-100)}.tile-2,.tone-teal{color:var(--teal-600);background:var(--teal-100)}.tile-3,.tone-coral{color:var(--coral-600);background:var(--coral-100)}.tile-4,.tone-blue{color:var(--blue-600);background:var(--blue-100)}.benefit-card h3{letter-spacing:-.02em;margin:27px 0 10px;font-size:17px}.benefit-card p{color:var(--ink-soft);margin-bottom:0;font-size:13px;line-height:1.65}.method-section{background:var(--surface-violet);width:100%;max-width:none;padding-left:max(24px,50% - 580px);padding-right:max(24px,50% - 580px)}.method-steps{grid-template-columns:repeat(4,1fr);gap:13px;display:grid}.method-step{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);min-height:250px;padding:28px 25px;position:relative}.step-number{border:4px solid var(--surface-violet);color:#fff;background:var(--violet-600);border-radius:50%;place-items:center;width:30px;height:30px;font-size:11px;font-weight:800;display:grid;position:absolute;top:-13px;left:24px}.step-icon{color:var(--violet-600);background:var(--violet-50);margin-top:10px}.method-step h3{margin:24px 0 10px;font-size:18px}.method-step p{color:var(--ink-soft);margin-bottom:0;font-size:13px;line-height:1.65}.step-arrow{z-index:2;color:var(--violet-400);position:absolute;top:50%;right:-18px}.rtl .step-arrow{left:-18px;right:auto;transform:rotate(180deg)}.product-story{grid-template-columns:.82fr 1.18fr;align-items:center;gap:80px;display:grid}.product-story-copy h2{margin-bottom:22px}.feature-list{gap:13px;margin:28px 0;padding:0;list-style:none;display:grid}.feature-list li{align-items:center;gap:10px;font-size:14px;font-weight:700;display:flex}.feature-list svg{color:var(--teal-500)}.text-link{color:var(--violet-600);align-items:center;gap:8px;font-size:13px;font-weight:800;display:inline-flex}.roadmap-showcase{border-radius:var(--radius-lg);min-height:460px;box-shadow:var(--shadow-md);background:radial-gradient(circle at 85% 10%,#a78bfa38,#0000 32%),linear-gradient(145deg,#fbfaff,#f2edff);border:1px solid #ded6f3;padding:29px;position:relative}.theme-dark .roadmap-showcase{border-color:var(--line);background:linear-gradient(145deg,#1c1238,#140d2b)}.roadmap-showcase-head{justify-content:space-between;align-items:center;display:flex}.roadmap-showcase-head div{flex-direction:column;gap:4px;display:flex}.roadmap-showcase-head span{color:var(--violet-600);text-transform:uppercase;font-size:10px;font-weight:750}.roadmap-showcase-head strong{font-size:20px}.progress-pill{box-shadow:var(--shadow-sm);background:#fff;border-radius:999px;padding:7px 10px;color:var(--violet-700)!important}.roadmap-line{background:linear-gradient(90deg, var(--violet-500) 0 8%, #d8d3e5 8%);height:2px;position:absolute;top:154px;left:80px;right:80px}.roadmap-nodes{z-index:2;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:56px;display:grid;position:relative}.roadmap-node{text-align:center;flex-direction:column;align-items:center;display:flex}.node-bubble{background:#fff;border:5px solid #f6f3ff;border-radius:50%;place-items:center;width:54px;height:54px;display:grid;box-shadow:0 8px 22px #3c256b21}.node-done .node-bubble{color:#fff;background:var(--green-500)}.node-current .node-bubble{color:#fff;background:var(--violet-600);box-shadow:0 0 0 7px #7c3aed1f,0 10px 25px #7c3aed42}.node-locked .node-bubble{color:#aaa5b7;background:#e8e5ee}.roadmap-node small{color:var(--ink-faint);margin-top:12px;font-size:9px}.roadmap-node strong{max-width:90px;margin-top:4px;font-size:11px}.roadmap-current-card{box-shadow:var(--shadow-sm);background:#ffffffbd;border:1px solid #7c3aed2b;border-radius:15px;align-items:center;gap:13px;margin-top:52px;padding:15px;display:flex}.theme-dark .roadmap-current-card{background:#ffffff0a}.roadmap-current-card>div{flex-direction:column;flex:1;min-width:0;display:flex}.roadmap-current-card small{color:var(--ink-faint);text-transform:uppercase;font-size:9px}.roadmap-current-card strong{text-overflow:ellipsis;white-space:nowrap;margin:3px 0;font-size:13px;overflow:hidden}.roadmap-current-card div span{color:var(--ink-faint);align-items:center;gap:4px;font-size:10px;display:flex}.roadmap-current-card>a{color:#fff;background:var(--violet-600);border-radius:10px;place-items:center;width:38px;height:38px;display:grid}.subjects-section{padding-top:40px}.subject-showcase-grid{grid-template-columns:repeat(3,1fr);gap:15px;display:grid}.subject-card{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);min-height:135px;box-shadow:var(--shadow-sm);align-items:center;gap:16px;padding:24px;display:flex;position:relative}.subject-card:hover{border-color:var(--violet-400)}.subject-icon.large{border-radius:17px;width:58px;height:58px}.subject-card div{min-width:0}.subject-card h3{margin-bottom:7px;font-size:16px}.subject-card p{color:var(--ink-faint);margin-bottom:0;font-size:11px}.subject-arrow{color:var(--violet-600);margin-left:auto}.rtl .subject-arrow{margin-left:0;margin-right:auto}.rtl .subject-arrow.arrow-icon{transform:rotate(180deg)}.locked-subject{opacity:.67}.faq-section{background:var(--surface-violet);width:100%;max-width:none;padding-left:max(24px,50% - 450px);padding-right:max(24px,50% - 450px)}.faq-list{gap:10px;display:grid}.faq-item{border:1px solid var(--line);background:var(--surface);border-radius:15px}.faq-item button{text-align:start;background:0 0;justify-content:space-between;align-items:center;width:100%;min-height:62px;padding:0 20px;font-weight:750;display:flex}.faq-item button svg{transition:transform .2s}.faq-item.open button svg{transform:rotate(45deg)}.faq-item p{color:var(--ink-soft);margin:-4px 20px 20px;font-size:14px;line-height:1.65}.final-cta{border-radius:var(--radius-lg);background:radial-gradient(circle at 10% 30%,#a78bfa3d,#0000 26%),linear-gradient(135deg,#f8f5ff,#ede9fe);border:1px solid #ddd4fb;grid-template-columns:auto 1fr auto;align-items:center;gap:20px;width:min(1160px,100% - 48px);margin:80px auto;padding:38px 44px;display:grid}.theme-dark .final-cta{border-color:var(--line);background:linear-gradient(135deg,#211441,#17102f)}.final-cta-icon{color:#fff;background:linear-gradient(135deg, var(--violet-500), var(--violet-700));border-radius:20px;place-items:center;width:66px;height:66px;display:grid;transform:rotate(-5deg)}.final-cta h2{margin-bottom:7px;font-size:25px}.final-cta p{color:var(--ink-soft);margin-bottom:0;font-size:13px}.landing-footer{border-top:1px solid var(--line);grid-template-columns:1fr auto auto;align-items:center;gap:40px;width:min(1160px,100% - 48px);margin:0 auto;padding:45px 0;display:grid}.landing-footer>div:first-child p{color:var(--ink-faint);margin:8px 0 0;font-size:11px}.footer-links{color:var(--ink-soft);gap:22px;font-size:11px;display:flex}.landing-footer>p{color:var(--ink-faint);margin:0;font-size:10px}.auth-page{background:var(--surface);grid-template-columns:minmax(420px,.85fr) minmax(520px,1.15fr);min-height:100vh;display:grid}.auth-visual{color:#fff;background:radial-gradient(circle at 80% 35%,#8b5cf659,#0000 30%),linear-gradient(145deg,#0d0728,#28105e);flex-direction:column;padding:42px 56px;display:flex;position:relative;overflow:hidden}.auth-visual:before{opacity:.45;content:"";background-image:linear-gradient(#ffffff08 1px,#0000 1px),linear-gradient(90deg,#ffffff08 1px,#0000 1px);background-size:48px 48px;position:absolute;inset:0}.auth-back{z-index:2;color:#ffffffa3;align-items:center;gap:6px;font-size:12px;display:flex;position:absolute;top:45px;right:40px}.rtl .auth-back{left:40px;right:auto}.auth-visual .brand{z-index:2;position:relative}.auth-science-decor{z-index:1;pointer-events:none;position:absolute;inset:0;overflow:hidden}.auth-formula{color:#ede9feb8;letter-spacing:.02em;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);transform:rotate(var(--formula-angle,0deg));background:#7c3aed1a;border:1px solid #c4b5fd33;border-radius:13px;align-items:baseline;gap:2px;padding:10px 15px;font-family:Georgia,Times New Roman,serif;font-size:17px;display:inline-flex;position:absolute;box-shadow:0 16px 42px #09042033}.auth-formula sup,.auth-formula sub{font-size:.66em}.auth-formula-energy{--formula-angle:-5deg;top:17%;left:13%}.auth-formula-force{--formula-angle:4deg;top:28%;right:9%}.auth-formula-limit{--formula-angle:-3deg;top:43%;right:17%}.auth-formula-motion{--formula-angle:3deg;bottom:23%;right:7%}.auth-atom-mark,.auth-sigma-mark{color:#a78bfa33;position:absolute}.auth-atom-mark{top:8%;right:19%;transform:rotate(12deg)}.auth-sigma-mark{bottom:13%;left:13%;transform:rotate(-8deg)}.auth-visual-copy{z-index:2;max-width:470px;margin:auto 0 30px;position:relative}.auth-visual-copy h1{letter-spacing:-.055em;margin-bottom:18px;font-size:clamp(42px,5vw,64px);line-height:1.02}.auth-visual-copy p{color:#ffffffab;line-height:1.7}.auth-roadmap-mini{z-index:2;align-items:center;gap:0;margin-bottom:34px;display:flex;position:relative}.auth-roadmap-mini span{color:#ffffff80;background:#241052;border:4px solid #ffffff14;border-radius:50%;place-items:center;width:44px;height:44px;display:grid}.auth-roadmap-mini span.done{color:#fff;background:var(--green-500)}.auth-roadmap-mini span.current{color:#fff;background:var(--violet-600);box-shadow:0 0 0 8px #8b5cf624}.auth-roadmap-mini i{background:linear-gradient(90deg, var(--violet-700), var(--violet-400));width:70px;height:2px}.auth-quote{z-index:2;color:#ffffffa6;max-width:430px;margin-bottom:0;font-size:12px;line-height:1.6;position:relative}.auth-form-side{place-items:center;padding:80px 40px;display:grid;position:relative}.auth-top-actions{position:absolute;top:28px;right:32px}.rtl .auth-top-actions{left:32px;right:auto}.auth-form{width:min(430px,100%)}.auth-icon,.setup-icon{width:50px;height:50px;color:var(--violet-600);background:var(--violet-100)}.auth-form h2{letter-spacing:-.04em;margin:21px 0 9px;font-size:30px}.auth-form>p{color:var(--ink-soft);margin-bottom:28px;font-size:13px;line-height:1.55}.auth-form>label,.settings-form-grid label,.answer-field{flex-direction:column;gap:8px;margin-bottom:17px;display:flex}.auth-form label>span,.settings-form-grid label>span,.answer-field>span{color:var(--ink-soft);font-size:11px;font-weight:750}.auth-form input,.settings-form-grid input,.settings-form-grid select,.answer-field input,.answer-field textarea,.search-field input{border:1px solid var(--line-strong);background:var(--surface);border-radius:12px;outline:none;width:100%;min-height:48px;padding:0 14px;font-size:13px;transition:border-color .2s,box-shadow .2s}.auth-form input:focus,.settings-form-grid input:focus,.settings-form-grid select:focus,.answer-field input:focus,.answer-field textarea:focus{border-color:var(--violet-500);box-shadow:0 0 0 4px #8b5cf61a}.auth-form-row{justify-content:space-between;align-items:center;margin:4px 0 22px;font-size:11px;display:flex}.checkbox-label{align-items:center;flex-direction:row!important;gap:7px!important;margin:0!important;display:flex!important}.checkbox-label input{width:15px;min-height:15px;accent-color:var(--violet-600)}.auth-form-row a,.auth-switch a{color:var(--violet-600);font-weight:750}.auth-switch{text-align:center;margin:22px 0 15px!important}.auth-form>small{color:var(--ink-faint);text-align:center;font-size:9px;display:block}.success-panel{color:var(--green-600);background:var(--green-100);border:1px solid #22c55e40;border-radius:12px;align-items:center;gap:11px;margin-bottom:16px;padding:14px;display:flex}.success-panel div{flex-direction:column;gap:2px;display:flex}.success-panel span{font-size:11px}.setup-page{background:radial-gradient(circle at 50% 0%, #8b5cf61f, transparent 30%), var(--page);min-height:100vh;padding:0 24px 60px}.setup-topbar{justify-content:space-between;align-items:center;width:min(1040px,100%);min-height:80px;margin:0 auto;display:flex}.setup-topbar>span{color:var(--ink-faint);font-size:11px;font-weight:750}.setup-progress{gap:7px;width:min(560px,100%);margin:5px auto 35px;display:flex}.setup-progress span{background:var(--line);border-radius:999px;flex:1;height:4px}.setup-progress span.active{background:var(--violet-600)}.setup-card{border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--surface);width:min(780px,100%);box-shadow:var(--shadow-md);text-align:center;margin:0 auto;padding:48px}.setup-icon{margin:0 auto}.setup-card>h1{letter-spacing:-.04em;margin:22px 0 8px;font-size:34px}.setup-card>p,.setup-question>p{color:var(--ink-soft);font-size:13px;line-height:1.6}.setup-question{margin:36px 0 22px}.setup-question h2{margin-bottom:7px;font-size:20px}.choice-grid{gap:13px;display:grid}.choice-grid.two{grid-template-columns:repeat(2,1fr)}.choice-grid.three{grid-template-columns:repeat(3,1fr)}.choice-card{border:1px solid var(--line-strong);background:var(--surface-soft);border-radius:16px;flex-direction:column;justify-content:center;align-items:center;gap:12px;min-height:138px;padding:20px;display:flex;position:relative}.choice-card:hover,.choice-card.selected{border-color:var(--violet-500)}.choice-card.selected{background:var(--violet-50);box-shadow:0 0 0 3px #8b5cf614}.theme-dark .choice-card.selected{background:#7c3aed24}.choice-card>span{width:42px;height:42px;color:var(--violet-600);background:var(--violet-100);border-radius:12px;place-items:center;font-size:14px;font-weight:800;display:grid}.choice-card strong{font-size:13px}.choice-card>svg{color:var(--violet-600);position:absolute;top:12px;right:12px}.rtl .choice-card>svg{left:12px;right:auto}.branch-choice{min-height:160px}.setup-actions{justify-content:flex-end;gap:10px;margin-top:34px;display:flex}.rtl .setup-actions{justify-content:flex-start}.home-shell,.secondary-shell{background:var(--page);min-height:100vh}.app-header{z-index:30;border-bottom:1px solid var(--line);background:var(--surface);justify-content:space-between;align-items:center;min-height:72px;padding:0 max(24px,50% - 620px);display:flex;position:sticky;top:0}@supports (color:color-mix(in lab, red, red)){.app-header{background:color-mix(in srgb, var(--surface) 90%, transparent)}}.app-header{-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px)}.app-header-compact{padding:0 28px}.app-header-brand,.app-header-actions{align-items:center;gap:9px;display:flex}.notification-button{position:relative}.notification-button>span{border:1px solid var(--surface);background:var(--coral-500);border-radius:50%;width:6px;height:6px;position:absolute;top:8px;right:8px}.notif-wrapper{position:relative}.notif-tooltip{white-space:nowrap;background:var(--surface-raised,var(--surface));border:1px solid var(--line);color:var(--text-secondary,var(--muted));z-index:100;border-radius:10px;align-items:center;gap:8px;padding:10px 16px;font-size:.82rem;animation:.18s notifFadeIn;display:flex;position:absolute;top:calc(100% + 8px);right:0;box-shadow:0 6px 24px #0000001f}[dir=rtl] .notif-tooltip{left:0;right:auto}.notif-tooltip svg{opacity:.5;flex-shrink:0}@keyframes notifFadeIn{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}.header-search-bar{background:var(--surface);border:1px solid var(--primary,var(--teal-500));box-shadow:0 0 0 3px var(--primary,var(--teal-500));border-radius:10px;align-items:center;gap:6px;padding:4px 8px 4px 12px;display:flex}@supports (color:color-mix(in lab, red, red)){.header-search-bar{box-shadow:0 0 0 3px color-mix(in srgb, var(--primary,var(--teal-500)) 12%, transparent)}}.header-search-bar{min-width:180px;max-width:280px;animation:.2s searchBarIn}.header-search-bar svg{color:var(--muted);flex-shrink:0}.header-search-bar input{color:var(--text);background:0 0;border:none;outline:none;flex:1;min-width:0;padding:4px 0;font-size:.82rem}.header-search-bar input::placeholder{color:var(--muted)}.header-search-close{background:var(--line);width:22px;height:22px;color:var(--muted);cursor:pointer;border:none;border-radius:6px;place-items:center;padding:0;transition:background .15s,color .15s;display:grid}.header-search-close:hover{background:var(--text-secondary,var(--muted));color:var(--surface)}@keyframes searchBarIn{0%{opacity:0;max-width:40px}to{opacity:1;max-width:280px}}::highlight(search-results){background-color:var(--primary,var(--teal-500))}@supports (color:color-mix(in lab, red, red)){::highlight(search-results){background-color:color-mix(in srgb, var(--primary,var(--teal-500)) 30%, transparent)}}::highlight(search-results){color:inherit}.language-toggle-wrapper{display:inline-block;position:relative}.language-toggle{border:1px solid var(--line);background:var(--surface);height:36px;color:var(--text);cursor:pointer;border-radius:10px;align-items:center;gap:6px;padding:0 10px;font-size:.82rem;font-weight:500;transition:all .15s;display:flex}.language-toggle:hover,.language-toggle.open{border-color:var(--violet-500);color:var(--violet-600);background:var(--surface-raised,var(--surface))}.lang-chevron{transition:transform .2s}.lang-chevron.open{transform:rotate(180deg)}.language-dropdown{background:var(--surface);border:1px solid var(--line);z-index:1000;border-radius:12px;flex-direction:column;gap:3px;min-width:140px;padding:6px;animation:.18s notifFadeIn;display:flex;position:absolute;top:calc(100% + 8px);right:0;box-shadow:0 8px 30px #0000001f}[dir=rtl] .language-dropdown{left:0;right:auto}.language-dropdown-item{width:100%;color:var(--text);cursor:pointer;background:0 0;border:none;border-radius:8px;justify-content:space-between;align-items:center;padding:8px 10px;font-size:.85rem;font-weight:500;transition:background .12s;display:flex}.language-dropdown-item small{color:var(--muted);font-size:.72rem;font-weight:600}.language-dropdown-item:hover{background:var(--surface-raised,var(--line))}.language-dropdown-item.active{color:var(--violet-600);background:var(--violet-100);font-weight:600}.language-dropdown-item.active small{color:var(--violet-600)}.settings-logout{justify-content:flex-end;margin-top:28px;display:flex}.button-logout{color:#ef4444;background:#ef444414;border:1px solid #ef444433;font-weight:500;transition:all .18s}.button-logout:hover{color:#fff;background:#ef4444;border-color:#ef4444}.profile-chip{border:1px solid var(--line);background:var(--surface);border-radius:12px;align-items:center;gap:9px;padding:5px 8px 5px 5px;display:flex}.profile-chip>span{color:#fff;background:linear-gradient(135deg, var(--violet-500), var(--violet-700));border-radius:9px;place-items:center;width:32px;height:32px;font-size:12px;font-weight:800;display:grid}.profile-chip>div{flex-direction:column;gap:1px;display:flex}.profile-chip strong{font-size:10px}.profile-chip small{color:var(--ink-faint);font-size:8px}.profile-chip-active{cursor:default;pointer-events:none;border-color:var(--violet-500);background:var(--violet-500)}@supports (color:color-mix(in lab, red, red)){.profile-chip-active{background:color-mix(in srgb, var(--violet-500) 8%, var(--surface))}}.home-main{width:min(1240px,100% - 48px);margin:0 auto;padding:38px 0 75px}.welcome-row{justify-content:space-between;align-items:flex-end;margin-bottom:27px;display:flex}.welcome-row h1{letter-spacing:-.04em;margin-bottom:7px;font-size:31px}.welcome-row p{color:var(--ink-soft);margin-bottom:0;font-size:13px}.streak-chip{color:#b45309;background:#fff7ed;border:1px solid #f59e0b33;border-radius:11px;align-items:center;gap:7px;min-height:38px;padding:0 12px;font-size:11px;font-weight:750;display:inline-flex}.streak-chip svg{color:var(--amber-500)}.home-hero-grid{grid-template-columns:1.18fr .82fr;gap:17px;display:grid}.continue-card,.progress-card,.mini-roadmap-card,.objective-card,.featured-subject,.chapter-card,.global-practice-banner,.roadmap-page-card,.lesson-card,.exercise-workspace,.lesson-progress-card,.save-resource-card,.help-card,.practice-feature,.exercise-card,.exam-feature,.exam-row,.notebook-card,.readiness-card,.kpi-card,.activity-chart-card,.mastery-list-card,.recommendation-card,.settings-card,.exam-question-panel,.question-navigator{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow-sm)}.continue-card{color:#fff;min-height:342px;box-shadow:var(--shadow-violet);background:radial-gradient(circle at 86% 27%,#8b5cf6a6,#0000 27%),linear-gradient(135deg,#150941,#3b147d);border-color:#ffffff14;padding:29px;position:relative;overflow:hidden}.continue-card-top{justify-content:space-between;align-items:center;display:flex}.continue-icon{color:#ddd6fe;background:#ffffff1a}.continue-card .card-kicker{color:#c4b5fd;margin-top:26px}.continue-card h2{z-index:2;letter-spacing:-.04em;max-width:540px;margin-bottom:9px;font-size:28px;line-height:1.16;position:relative}.continue-card>p{z-index:2;color:#ffffffa6;font-size:12px;position:relative}.continue-meta{flex-wrap:wrap;gap:15px;margin:17px 0;display:flex}.continue-meta span,.exercise-meta span{color:#ffffffa8;align-items:center;gap:6px;font-size:10px;display:inline-flex}.continue-progress{align-items:center;gap:10px;max-width:430px;display:flex}.continue-progress>span{background:#ffffff21;border-radius:999px;flex:1;height:5px;overflow:hidden}.continue-progress i{border-radius:inherit;background:linear-gradient(90deg,#5eead4,#a7f3d0);height:100%;display:block}.continue-progress strong{font-size:10px}.continue-actions{z-index:3;gap:9px;margin-top:23px;display:flex;position:relative}.continue-decoration{color:#ffffff30;pointer-events:none;width:200px;height:210px;font-family:Georgia,serif;position:absolute;top:55px;right:23px}.continue-decoration span{font-size:36px;position:absolute;top:8px;right:12px}.continue-decoration em{font-size:25px;font-style:normal;position:absolute;bottom:22px;right:20px;transform:rotate(-8deg)}.continue-decoration i{border-bottom:1px solid #ffffff29;border-left:1px solid #ffffff29;width:135px;height:70px;position:absolute;top:75px;right:22px;transform:skewY(-12deg)}.progress-card{min-height:342px;padding:27px}.card-header{justify-content:space-between;align-items:flex-start;gap:14px;display:flex}.card-header h2{letter-spacing:-.03em;margin-bottom:0;font-size:18px}.compact-link{white-space:nowrap}.progress-overview{align-items:center;gap:25px;margin-top:29px;display:flex}.progress-ring{--progress:0;background:conic-gradient(var(--teal-500) calc(var(--progress) * 1%), var(--line) 0);border-radius:50%;flex:none;place-items:center;width:104px;height:104px;display:grid;position:relative}.progress-ring:before{background:var(--surface);content:"";border-radius:50%;width:78px;height:78px;position:absolute}.progress-ring span{z-index:2;font-size:20px;font-weight:850;position:relative}.progress-stats{flex:1;grid-template-columns:1fr 1fr;gap:15px;display:grid}.progress-stats div{flex-direction:column;gap:3px;display:flex}.progress-stats strong{font-size:15px}.progress-stats span{color:var(--ink-faint);font-size:9px}.mini-chart{align-items:flex-end;gap:9px;height:66px;margin-top:22px;display:flex}.mini-chart>span{background:var(--surface-soft);border-radius:4px;flex:1;height:100%;position:relative;overflow:hidden}.mini-chart i{background:linear-gradient(to top, var(--violet-600), #c4b5fd);border-radius:4px;position:absolute;bottom:0;left:0;right:0}.home-section{margin-top:39px}.section-title-row{justify-content:space-between;align-items:flex-end;margin-bottom:17px;display:flex}.section-title-row h2{letter-spacing:-.035em;margin-bottom:0;font-size:22px}.quick-grid{grid-template-columns:repeat(5,1fr);gap:13px;display:grid}.quick-card{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);min-height:190px;box-shadow:var(--shadow-sm);padding:20px;transition:transform .2s,border-color .2s;position:relative}.quick-card:hover{border-color:var(--violet-400);transform:translateY(-3px)}.quick-card h3{margin:20px 0 8px;font-size:15px}.quick-card p{color:var(--ink-soft);margin-bottom:0;font-size:10px;line-height:1.55}.quick-arrow{color:var(--violet-600);position:absolute;bottom:16px;right:16px}.rtl .quick-arrow{left:16px;right:auto;transform:rotate(180deg)}.quick-card-disabled{opacity:.55}.soon-badge{color:var(--violet-600);background:var(--violet-100);border-radius:999px;padding:4px 7px;font-size:8px;font-weight:800;position:absolute;top:16px;right:16px}.rtl .soon-badge{left:16px;right:auto}.home-bottom-grid{grid-template-columns:1.1fr .9fr;gap:15px;margin-top:17px;display:grid}.mini-roadmap-card,.objective-card{min-height:190px;padding:24px}.card-header>a{color:var(--violet-600);font-size:10px;font-weight:750}.home-roadmap{grid-template-columns:repeat(5,1fr);gap:8px;margin-top:28px;display:grid;position:relative}.home-roadmap:before{z-index:0;background:var(--line);content:"";height:2px;position:absolute;top:17px;left:8%;right:8%}.home-roadmap-node{z-index:1;text-align:center;flex-direction:column;align-items:center;gap:8px;display:flex;position:relative}.home-roadmap-node>span{border:4px solid var(--surface);width:35px;height:35px;color:var(--ink-faint);background:var(--surface-soft);border-radius:50%;place-items:center;font-size:10px;font-weight:800;display:grid}.home-roadmap-node.done>span{color:#fff;background:var(--green-500)}.home-roadmap-node.current>span{color:#fff;background:var(--violet-600);box-shadow:0 0 0 5px #8b5cf61f}.home-roadmap-node small{max-width:78px;color:var(--ink-soft);font-size:8px}.objective-card{background:radial-gradient(circle at 100% 0%, #8b5cf61f, transparent 35%), var(--surface);grid-template-columns:auto 1fr;align-items:start;gap:14px;display:grid}.objective-icon{color:var(--violet-600);background:var(--violet-100)}.objective-card h2{margin-bottom:6px;font-size:17px}.objective-card p{color:var(--ink-soft);margin-bottom:0;font-size:10px;line-height:1.5}.objective-card .button{grid-column:2;justify-self:start}.secondary-shell{grid-template-columns:232px minmax(0,1fr);transition:grid-template-columns .25s;display:grid}.secondary-shell.sidebar-collapsed{grid-template-columns:76px minmax(0,1fr)}.sidebar{z-index:45;color:#fff;background:radial-gradient(circle at 20% 0,#7c3aed57,#0000 24%),linear-gradient(#110832,#160b3b);flex-direction:column;height:100vh;padding:20px 15px;display:flex;position:sticky;top:0}.sidebar .brand{color:#fff}.sidebar-head{justify-content:space-between;align-items:center;min-height:52px;padding:0 5px;display:flex}.sidebar-nav{gap:5px;margin-top:25px;display:grid}.sidebar-link{color:#ffffff8c;border-radius:11px;align-items:center;gap:12px;min-height:44px;padding:0 13px;font-size:11px;font-weight:650;display:flex;position:relative}.sidebar-link:hover{color:#fff;background:#ffffff0f}.sidebar-link.active{color:#fff;background:linear-gradient(135deg,#8b5cf6f2,#6d28d9f2);box-shadow:0 8px 20px #6d28d947}.sidebar-link small{color:#c4b5fd;background:#ffffff14;border-radius:999px;margin-left:auto;padding:3px 6px;font-size:7px}.rtl .sidebar-link small{margin-left:0;margin-right:auto}.sidebar-bottom{gap:5px;margin-top:auto;display:grid}.sidebar-collapse{color:#ffffff7a;background:#ffffff0a;border-radius:11px;align-items:center;gap:12px;min-height:42px;padding:0 13px;font-size:10px;display:flex}.sidebar-collapsed .sidebar-head{justify-content:center}.sidebar-collapsed .sidebar-link,.sidebar-collapsed .sidebar-collapse{justify-content:center;padding:0}.secondary-content{min-width:0}.page-main{width:min(1180px,100% - 56px);margin:0 auto;padding:38px 0 70px}.page-heading{justify-content:space-between;align-items:flex-end;gap:30px;margin-bottom:28px;display:flex}.page-heading h1{letter-spacing:-.05em;margin-bottom:7px;font-size:clamp(29px,3vw,40px)}.page-heading p{max-width:670px;color:var(--ink-soft);margin-bottom:0;font-size:13px;line-height:1.6}.search-field{border:1px solid var(--line);background:var(--surface);border-radius:11px;align-items:center;gap:8px;padding:0 12px;display:flex}.search-field input{background:0 0;border:0;min-height:40px;padding:0}.compact-search{width:220px}.featured-subject{background:radial-gradient(circle at 80% 30%, #8b5cf630, transparent 30%), linear-gradient(135deg, var(--surface), var(--surface-violet));border-color:#ded3fb;grid-template-columns:1.1fr .9fr;min-height:365px;display:grid;position:relative;overflow:hidden}.featured-subject-stack{gap:18px;display:grid}.featured-subject-content{z-index:2;padding:37px;position:relative}.featured-subject-content>.status-chip{position:absolute;top:38px;left:110px}.rtl .featured-subject-content>.status-chip{left:auto;right:110px}.featured-subject h2{letter-spacing:-.04em;margin:29px 0 10px;font-size:30px}.featured-subject-content>p{max-width:540px;color:var(--ink-soft);font-size:13px;line-height:1.65}.featured-stats{gap:32px;margin:25px 0;display:flex}.featured-stats span{color:var(--ink-faint);flex-direction:column;gap:2px;font-size:9px;display:flex}.featured-stats strong{color:var(--ink);font-size:17px}.featured-math-visual{min-height:360px;position:relative}.math-graph{border-bottom:2px solid #7c3aed3b;border-left:2px solid #7c3aed3b;width:260px;height:180px;position:absolute;bottom:55px;right:22%}.math-graph:before{opacity:.42;content:"";background-image:linear-gradient(#7c3aed21 1px,#0000 1px),linear-gradient(90deg,#7c3aed21 1px,#0000 1px);background-size:26px 26px;position:absolute;inset:0}.math-graph i{border-top:4px solid var(--violet-500);border-radius:50%;width:220px;height:80px;position:absolute;top:69px;left:18px;transform:rotate(-10deg)}.math-graph b{border:3px solid var(--violet-500);background:var(--surface);border-radius:50%;width:11px;height:11px;position:absolute;top:104px;left:126px}.math-float{color:var(--violet-600);box-shadow:var(--shadow-sm);background:#ffffffad;border:1px solid #7c3aed26;border-radius:12px;padding:10px 14px;font-family:Georgia,serif;position:absolute}.math-float.one{top:45px;right:16%}.math-float.two{font-size:25px;top:115px;left:4%}.math-float.three{bottom:50px;right:7%}.featured-physics-subject{border-color:var(--violet-500)}@supports (color:color-mix(in lab, red, red)){.featured-physics-subject{border-color:color-mix(in srgb, var(--violet-500) 28%, var(--line))}}.featured-physics-subject{background:radial-gradient(circle at 79% 28%, #8b5cf633, transparent 31%), radial-gradient(circle at 93% 80%, #4c1d951a, transparent 28%), linear-gradient(135deg, var(--surface), var(--surface-violet))}.featured-physics-subject .button-primary{border-color:var(--violet-600);background:var(--violet-600);box-shadow:0 10px 24px #6d28d933}.featured-physics-visual{min-height:360px;position:relative}.physics-float{z-index:2;color:var(--violet-700);background:var(--surface);border:1px solid #7c3aed33;border-radius:12px;padding:9px 13px;position:absolute}@supports (color:color-mix(in lab, red, red)){.physics-float{background:color-mix(in srgb, var(--surface) 80%, transparent)}}.physics-float{box-shadow:var(--shadow-sm);font-family:Georgia,serif;font-size:14px;font-weight:700}.physics-float.one{top:43px;right:14%}.physics-float.two{font-size:27px;top:112px;left:5%}.physics-float.three{bottom:42px;right:8%}.physics-wave-line{justify-content:space-between;align-items:center;width:min(330px,76%);height:105px;display:flex;position:absolute;top:47%;right:11%}.physics-wave-line:before{content:"";background:linear-gradient(90deg,#0000,#7c3aed6b,#0000);height:2px;position:absolute;left:0;right:0}.physics-wave-line i{z-index:1;border:3px solid var(--violet-500);background:var(--surface);border-radius:50%;width:13px;height:13px;position:relative;box-shadow:0 5px 14px #6d28d933}.physics-wave-line i:first-child,.physics-wave-line i:nth-child(7){transform:translateY(0)}.physics-wave-line i:nth-child(2),.physics-wave-line i:nth-child(6){transform:translateY(-31px)}.physics-wave-line i:nth-child(3),.physics-wave-line i:nth-child(5){transform:translateY(31px)}.physics-wave-line i:nth-child(4){transform:translateY(0)}.physics-orbit{border:1px solid #7c3aed38;border-radius:50%;place-items:center;width:78px;height:78px;display:grid;position:absolute;bottom:38px;left:8%;box-shadow:0 0 0 15px #8b5cf60e,0 0 0 30px #4c1d9508}.physics-orbit span{width:52px;height:52px;color:var(--violet-700);background:var(--violet-100);border-radius:17px;place-items:center;display:grid}@supports (color:color-mix(in lab, red, red)){.physics-orbit span{background:color-mix(in srgb, var(--violet-100) 74%, var(--surface))}}.subject-showcase-grid-upcoming{grid-template-columns:minmax(280px,1fr) 2fr}.subject-row-title{margin-top:37px}.domain-tabs,.lesson-tabs,.notebook-tabs{scrollbar-width:none;gap:7px;padding-bottom:2px;display:flex;overflow-x:auto}.domain-tabs button,.lesson-tabs button,.notebook-tabs button{border:1px solid var(--line);min-height:40px;color:var(--ink-soft);background:var(--surface);white-space:nowrap;border-radius:10px;align-items:center;gap:8px;padding:0 15px;font-size:11px;font-weight:700;display:inline-flex}.domain-tabs button.active,.lesson-tabs button.active,.notebook-tabs button.active{color:#fff;border-color:var(--violet-600);background:var(--violet-600)}.chapter-grid{grid-template-columns:repeat(2,1fr);gap:15px;margin-top:18px;display:grid}.chapter-card{min-height:245px;padding:25px;transition:transform .2s,border-color .2s}.chapter-card:hover{border-color:var(--violet-400);transform:translateY(-3px)}.chapter-card-head{justify-content:space-between;align-items:center;display:flex}.chapter-card-head>span:last-child{color:var(--ink-faint);font-size:10px;font-weight:750}.course-symbol-tile{border:1px solid #ffffff9e;border-radius:15px;flex:none;place-items:center;width:48px;height:48px;display:grid;overflow:hidden;box-shadow:inset 0 1px #ffffff94,0 8px 18px #2c1e551a}.course-symbol-mark{letter-spacing:-.07em;font-family:Georgia,Times New Roman,serif;font-size:21px;font-style:italic;font-weight:800;line-height:1}.course-symbol-hero{width:60px;height:60px;box-shadow:none;border-radius:18px}.course-symbol-hero .course-symbol-mark{font-size:25px}.course-symbol-limits{color:#6d28d9;background:linear-gradient(145deg,#f1eaff,#ddd0ff)}.course-symbol-derivative{color:#1d4ed8;background:linear-gradient(145deg,#e9f2ff,#cfe1ff)}.course-symbol-sequences{color:#0f766e;background:linear-gradient(145deg,#e0faf5,#bff2e8)}.course-symbol-primitives{color:#be185d;background:linear-gradient(145deg,#fff0f7,#ffd8e9)}.course-symbol-logarithms{color:#7e22ce;background:linear-gradient(145deg,#f6ebff,#e8d1ff)}.course-symbol-complex{color:#0369a1;background:linear-gradient(145deg,#e6f7ff,#c9ebff)}.course-symbol-exponentials{color:#b45309;background:linear-gradient(145deg,#fff7df,#ffe8aa)}.course-symbol-integrals{color:#0e7490;background:linear-gradient(145deg,#e7fbff,#c6f2fa)}.course-symbol-differential{color:#5b21b6;background:linear-gradient(145deg,#f1eaff,#dcd0ff)}.course-symbol-space{color:#4338ca;background:linear-gradient(145deg,#eef2ff,#d9e0ff)}.course-symbol-counting{color:#7c3aed;background:linear-gradient(145deg,#f5efff,#e4d5ff)}.course-symbol-waves{color:#0369a1;background:linear-gradient(145deg,#e6f7ff,#bfe8ff)}.course-symbol-periodic-waves{color:#6d28d9;background:linear-gradient(145deg,#f1eaff,#d9ccff)}.course-symbol-light-wave{color:#b45309;background:linear-gradient(145deg,#fff7df,#ffe3a3)}.course-symbol-radioactive-decay{color:#6d28d9;background:linear-gradient(145deg,#f4edff,#dfd0ff)}.course-symbol-nuclear-energy{color:#5b21b6;background:linear-gradient(145deg,#f3efff,#dcd1ff)}.course-symbol-dipole-rc{color:#6d28d9;background:linear-gradient(145deg,#f4efff,#ddd2ff)}.course-symbol-dipole-rl{color:#6d28d9;background:linear-gradient(145deg,#f5f0ff,#ded2ff)}.course-symbol-circuit-rlc{color:#6d28d9;background:linear-gradient(145deg,#f6f1ff,#ddd0ff)}.course-symbol-forced-rlc{color:#5b21b6;background:linear-gradient(145deg,#faf7ff,#e5d7ff)}.course-symbol-electromagnetic{color:#6d28d9;background:linear-gradient(145deg,#f7f2ff,#ddd3ff)}.course-symbol-amplitude-modulation{color:#7c3aed;background:linear-gradient(145deg,#faf5ff,#e8d9ff)}.course-symbol-reaction-kinetics{color:#6d28d9;background:linear-gradient(145deg,#faf5ff,#e6ddff)}.course-symbol-cellular-energy{color:#6d28d9;background:linear-gradient(145deg,#f7f2ff,#dcd1ff)}.course-symbol-philosophy{color:#7e22ce;background:linear-gradient(145deg,#f7efff,#dfccff)}.course-symbol-english{color:#6d28d9;background:linear-gradient(145deg,#f1eaff,#d9ccff)}.course-symbol-default{color:var(--violet-600);background:var(--violet-100)}.course-symbol-limits .course-symbol-mark,.course-symbol-logarithms .course-symbol-mark,.course-symbol-periodic-waves .course-symbol-mark,.course-symbol-light-wave .course-symbol-mark{letter-spacing:-.09em;font-size:18px}.course-symbol-radioactive-decay .course-symbol-mark{letter-spacing:-.06em;font-size:16px}.course-symbol-nuclear-energy .course-symbol-mark{letter-spacing:-.06em;font-size:17px}.course-symbol-dipole-rc .course-symbol-mark,.course-symbol-dipole-rl .course-symbol-mark{letter-spacing:-.04em;font-size:16px}.course-symbol-circuit-rlc .course-symbol-mark{letter-spacing:-.05em;font-size:13px}.course-symbol-forced-rlc .course-symbol-mark{letter-spacing:-.07em;font-size:13px}.course-symbol-electromagnetic .course-symbol-mark{letter-spacing:-.08em;font-size:12px}.course-symbol-amplitude-modulation .course-symbol-mark{letter-spacing:-.04em;font-size:16px;font-style:normal}.course-symbol-reaction-kinetics .course-symbol-mark{letter-spacing:-.08em;font-size:.8em}.course-symbol-cellular-energy .course-symbol-mark{letter-spacing:-.04em;font-size:14px;font-style:normal}.theme-dark .course-symbol-tile{filter:saturate(.82)brightness(.82);border-color:#ffffff1a}.course-home-identity{align-items:center;gap:18px;display:flex}.course-home-identity .course-eyebrow{margin:0}.chapter-card h2{margin:21px 0 7px;font-size:20px}.chapter-card>p{color:var(--ink-soft);font-size:11px}.chapter-progress>span,.mastery-row>span{background:var(--line);border-radius:999px;height:5px;display:block;overflow:hidden}.chapter-progress i,.mastery-row i{border-radius:inherit;background:linear-gradient(90deg, var(--violet-600), var(--teal-500));height:100%;display:block}.chapter-card-footer{color:var(--violet-600);justify-content:space-between;align-items:center;margin-top:20px;font-size:11px;font-weight:800;display:flex}.global-practice-banner,.recommendation-card{align-items:center;gap:15px;margin-top:18px;padding:22px;display:flex}.global-practice-banner>div,.recommendation-card>div{flex:1}.global-practice-banner h2,.recommendation-card h2{margin-bottom:5px;font-size:17px}.global-practice-banner p,.recommendation-card p{color:var(--ink-soft);margin-bottom:0;font-size:10px}.breadcrumbs{color:var(--ink-faint);flex-wrap:wrap;gap:5px;margin-bottom:19px;font-size:10px;display:flex}.breadcrumbs span{align-items:center;gap:5px;display:inline-flex}.rtl .breadcrumbs svg{transform:rotate(180deg)}.chapter-readiness{border:1px solid var(--line);background:var(--surface);border-radius:13px;align-items:center;gap:10px;padding:10px 14px;display:flex}.chapter-readiness>span{color:var(--violet-600);font-size:23px;font-weight:850}.chapter-readiness div{flex-direction:column;display:flex}.chapter-readiness strong{font-size:10px}.chapter-readiness small{color:var(--ink-faint);font-size:8px}.roadmap-page-card{background:radial-gradient(circle at 90% 5%, #8b5cf61a, transparent 26%), var(--surface);padding:38px;position:relative;overflow:hidden}.roadmap-page-line{z-index:0;background:linear-gradient(var(--violet-600) 0 8%, var(--line) 8%);width:2px;position:absolute;top:70px;bottom:70px;left:64px}.rtl .roadmap-page-line{left:auto;right:64px}.roadmap-page-nodes{z-index:1;gap:15px;display:grid;position:relative}.roadmap-page-node{grid-template-columns:54px 1fr;align-items:center;gap:20px;display:grid}.roadmap-page-bubble{border:5px solid var(--surface);width:54px;height:54px;color:var(--ink-faint);background:var(--surface-soft);box-shadow:var(--shadow-sm);border-radius:50%;place-items:center;display:grid}.roadmap-page-node.done .roadmap-page-bubble{color:#fff;background:var(--green-500)}.roadmap-page-node.current .roadmap-page-bubble{color:#fff;background:var(--violet-600);box-shadow:0 0 0 7px #8b5cf61a, var(--shadow-sm)}.roadmap-page-node.checkpoint .roadmap-page-bubble{color:#fff;background:var(--amber-500)}.roadmap-page-node.locked .roadmap-page-bubble{color:#aaa5b7;background:#ebe9f0}.roadmap-node-card{border:1px solid var(--line);background:var(--surface-soft);border-radius:14px;grid-template-columns:1fr auto;align-items:center;gap:14px;padding:18px 20px;display:grid}.roadmap-page-node.current .roadmap-node-card{background:var(--violet-50);border-color:#8b5cf666}.theme-dark .roadmap-page-node.current .roadmap-node-card{background:#7c3aed1f}.roadmap-node-card small{color:var(--ink-faint);text-transform:uppercase;font-size:8px}.roadmap-node-card h2{margin:4px 0;font-size:15px}.roadmap-node-card div>span{color:var(--ink-faint);align-items:center;gap:4px;font-size:9px;display:flex}.node-status{color:var(--ink-faint);background:var(--line);border-radius:999px;padding:6px 9px;font-size:8px;font-weight:800}.status-done{color:var(--green-600);background:var(--green-100)}.status-current{color:var(--violet-600);background:var(--violet-100)}.status-checkpoint{color:#b45309;background:#fef3c7}.roadmap-node-card>p{color:var(--ink-faint);grid-column:1/-1;margin:-5px 0 0;font-size:9px}.learn-layout{grid-template-columns:minmax(0,1fr) 270px;gap:18px;display:grid}.learn-main{min-width:0}.learn-heading{justify-content:space-between;align-items:flex-end;gap:20px;margin-bottom:23px;display:flex}.learn-heading h1{letter-spacing:-.04em;margin-bottom:0;font-size:30px}.autosave-state{color:var(--green-600);align-items:center;gap:5px;font-size:9px;display:inline-flex}.lesson-tabs{margin-bottom:15px}.lesson-tabs button{padding:0 12px}.lesson-tabs button>span{width:20px;height:20px;color:var(--ink-faint);background:var(--surface-soft);border-radius:50%;place-items:center;font-size:8px;display:grid}.lesson-tabs button.active>span{color:var(--violet-600);background:#fff}.lesson-card,.exercise-workspace{min-height:510px;padding:35px}.lesson-label{color:var(--violet-600);letter-spacing:.08em;text-transform:uppercase;align-items:center;gap:6px;margin-bottom:18px;font-size:9px;font-weight:800;display:inline-flex}.lesson-card>h2,.exercise-prompt h2{letter-spacing:-.035em;margin-bottom:15px;font-size:25px}.lesson-card>p{max-width:740px;color:var(--ink-soft);font-size:14px;line-height:1.8}.composition-visual{background:var(--surface-violet);border:1px dashed #d5caef;border-radius:16px;justify-content:center;align-items:center;gap:15px;margin:33px 0;padding:30px;display:flex}.function-box{border:1px solid var(--line-strong);background:var(--surface);border-radius:13px;place-items:center;min-width:76px;height:55px;font-family:Georgia,serif;font-size:18px;font-weight:700;display:grid}.function-box.accent{color:var(--violet-700);background:var(--violet-100);border-color:#c4b5fd}.function-box.accent-two{color:var(--teal-600);background:var(--teal-100);border-color:#99f6e4}.lesson-callout,.bac-points,.hint-panel,.feedback-panel{border-radius:13px;align-items:flex-start;gap:12px;margin:24px 0;padding:16px;display:flex}.lesson-callout{color:var(--violet-700);background:var(--violet-50)}.lesson-callout p,.bac-points p,.hint-panel p,.feedback-panel p{color:var(--ink-soft);margin:4px 0 0;font-size:11px;line-height:1.55}.method-list,.guided-steps{gap:12px;margin:26px 0;display:grid}.method-list>div,.guided-steps>div{border:1px solid var(--line);background:var(--surface-soft);border-radius:13px;align-items:center;gap:13px;padding:16px;display:flex}.method-list span,.guided-steps span{width:31px;height:31px;color:var(--violet-600);background:var(--violet-100);border-radius:9px;flex:none;place-items:center;font-size:10px;font-weight:800;display:grid}.method-list p,.guided-steps p{margin:0;font-size:12px}.bac-points{color:#b45309;background:#fff7ed}.guided-card>h2{color:var(--violet-700);margin-bottom:27px;font-family:Georgia,serif;font-size:30px}.formula-prompt,.exam-formula{border:1px solid var(--line);background:var(--surface-violet);text-align:center;border-radius:14px;padding:23px;font-family:Georgia,serif;font-size:23px}.exercise-prompt{margin-bottom:26px}.answer-field textarea{resize:vertical;min-height:190px;padding-top:14px}.science-keyboard{border:1px solid var(--line);background:var(--surface-soft);direction:ltr;border-radius:12px;grid-template-columns:repeat(6,1fr);gap:6px;margin:14px 0 18px;padding:10px;display:grid}.science-keyboard button{border:1px solid var(--line);background:var(--surface);border-radius:8px;min-height:37px;font-family:Georgia,serif;font-size:12px}.science-keyboard button:hover{color:var(--violet-600);border-color:var(--violet-400)}.feedback-panel.correct{color:var(--green-600);background:var(--green-100);border:1px solid #22c55e33}.feedback-panel.incorrect{color:var(--coral-600);background:var(--coral-100);border:1px solid #f43f782e}.hint-panel{color:#b45309;background:#fff7ed}.workspace-actions{justify-content:space-between;gap:10px;margin-top:22px;display:flex}.learn-side-panel{align-content:start;gap:12px;padding-top:51px;display:grid}.lesson-progress-card{padding:19px}.lesson-progress-card .chapter-progress{margin:13px 0 17px}.lesson-progress-card ul{gap:8px;margin:0;padding:0;list-style:none;display:grid}.lesson-progress-card li{min-height:33px;color:var(--ink-faint);align-items:center;gap:8px;font-size:9px;display:flex}.lesson-progress-card li>span{border:1px solid var(--line);border-radius:7px;place-items:center;width:23px;height:23px;font-size:8px;display:grid}.lesson-progress-card li.active{color:var(--violet-600);font-weight:800}.lesson-progress-card li.active>span{color:#fff;border-color:var(--violet-600);background:var(--violet-600)}.lesson-progress-card li.done>span{color:var(--green-600);background:var(--green-100)}.save-resource-card,.help-card{text-align:start;align-items:center;gap:10px;width:100%;padding:15px;display:flex}.save-resource-card>svg{color:var(--violet-600)}.save-resource-card div,.help-card div{flex-direction:column;gap:2px;display:flex}.save-resource-card strong,.help-card strong{font-size:10px}.save-resource-card span{color:var(--ink-faint);font-size:8px}.help-card{color:var(--teal-600);background:var(--teal-100)}.help-card p{color:#0f766e;margin:0;font-size:8px}.filter-bar{flex-wrap:wrap;gap:8px;margin-bottom:17px;display:flex}.filter-bar button{border:1px solid var(--line);min-height:39px;color:var(--ink-soft);background:var(--surface);border-radius:10px;align-items:center;gap:7px;padding:0 12px;font-size:10px;display:inline-flex}.practice-feature{color:#fff;background:radial-gradient(circle at 80% 35%,#5eead42e,#0000 28%),linear-gradient(135deg,#150a42,#3a1976);border-color:#ffffff14;min-height:305px;padding:35px;position:relative;overflow:hidden}.practice-feature>div:first-child{z-index:2;max-width:590px;position:relative}.practice-feature h2{margin:22px 0 10px;font-size:29px}.practice-feature p{color:#ffffffab;font-size:13px}.practice-orbit{border:1px solid #ffffff21;border-radius:50%;width:210px;height:210px;position:absolute;top:38px;right:9%}.practice-orbit:before,.practice-orbit:after{content:"";border:1px solid #ffffff1a;border-radius:50%;position:absolute;inset:25px}.practice-orbit:after{inset:55px}.practice-orbit span{color:#5eead4;background:#ffffff1a;border-radius:20px;place-items:center;width:70px;height:70px;display:grid;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.practice-orbit i,.practice-orbit b{background:var(--violet-400);width:13px;height:13px;box-shadow:0 0 20px var(--violet-400);border-radius:50%;position:absolute}.practice-orbit i{top:18px;left:55px}.practice-orbit b{background:var(--teal-500);box-shadow:0 0 20px var(--teal-500);bottom:58px;right:11px}.exercise-card-grid{grid-template-columns:repeat(3,1fr);gap:14px;display:grid}.exercise-course-feature{border:1px solid var(--violet-200);background:linear-gradient(135deg, var(--surface), var(--violet-100));box-shadow:var(--shadow-sm);border-radius:22px;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:22px;margin:24px 0;padding:26px;display:grid}.exercise-course-feature-icon{color:#fff;background:var(--violet-600);border-radius:18px;place-items:center;width:62px;height:62px;display:grid}.exercise-course-feature h2{color:var(--ink);margin:5px 0 7px}.exercise-course-feature p{max-width:720px;color:var(--ink-soft);margin:0;line-height:1.55}.exercise-course-feature-meta{color:var(--violet-700);gap:16px;margin-top:13px;font-size:13px;font-weight:700;display:flex}.exercise-course-feature-meta span{align-items:center;gap:6px;display:inline-flex}.series-exercise-page{max-width:900px;margin:30px auto 70px}.series-exercise-header{justify-content:space-between;align-items:flex-end;gap:28px;margin:16px 0 20px;display:flex}.series-exercise-header h1{color:var(--ink);margin:7px 0 8px;font-size:clamp(27px,4vw,40px)}.series-exercise-header p{max-width:680px;color:var(--ink-soft);margin:0;line-height:1.6}.series-exercise-counter{min-width:90px;color:var(--violet-700);background:var(--violet-100);border-radius:16px;flex-direction:column;align-items:center;padding:14px 18px;display:flex}.series-exercise-counter strong{font-size:25px}.series-exercise-counter span{font-size:12px;font-weight:700}.series-exercise-progress{background:var(--line);border-radius:999px;height:7px;overflow:hidden}.series-exercise-progress span{border-radius:inherit;background:var(--violet-600);height:100%;transition:width .25s;display:block}.series-exercise-picker{z-index:4;border:1px solid var(--line);background:var(--surface);border-radius:16px;margin:16px 0 22px;padding:8px;position:sticky;top:12px;overflow-x:auto}@supports (color:color-mix(in lab, red, red)){.series-exercise-picker{background:color-mix(in srgb, var(--surface) 92%, transparent)}}.series-exercise-picker{box-shadow:var(--shadow-sm);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);scrollbar-width:thin;overscroll-behavior-inline:contain}.series-exercise-picker>div{gap:8px;width:max-content;min-width:100%;display:flex}.series-exercise-picker button{border:1px solid var(--line);min-width:68px;color:var(--ink-soft);background:var(--surface);cursor:pointer;border-radius:11px;justify-content:center;align-items:center;gap:6px;padding:9px 11px;transition:border-color .18s,color .18s,background .18s,transform .18s;display:flex}.series-exercise-picker button:hover{border-color:var(--violet-300);color:var(--violet-700);transform:translateY(-1px)}.series-exercise-picker button.visited{color:var(--violet-700);background:var(--violet-100)}.series-exercise-picker button.active{border-color:var(--violet-600);color:#fff;background:var(--violet-600)}.series-exercise-picker button small{font-size:10px;font-weight:700}.series-exercise-picker button strong{font-size:14px}.series-exercise-stepper{justify-content:center;align-items:center;max-width:430px;margin:22px auto;display:flex}.series-exercise-stepper>span{color:var(--ink-soft);align-items:center;gap:8px;font-size:13px;font-weight:700;display:flex}.series-exercise-stepper i{border:1px solid var(--line);background:var(--surface);border-radius:50%;place-items:center;width:28px;height:28px;font-style:normal;display:grid}.series-exercise-stepper>span.active,.series-exercise-stepper>span.done{color:var(--violet-700)}.series-exercise-stepper>span.active i,.series-exercise-stepper>span.done i{border-color:var(--violet-600);color:#fff;background:var(--violet-600)}.series-exercise-stepper>b{background:var(--violet-200);width:90px;height:2px;margin:0 12px}.series-content-card{border:1px solid var(--line);background:var(--surface);box-shadow:var(--shadow-md);border-radius:24px;padding:clamp(24px,5vw,42px)}.series-card-heading{color:var(--violet-700);text-transform:uppercase;letter-spacing:.04em;justify-content:space-between;align-items:center;gap:16px;font-size:13px;font-weight:800;display:flex}.series-card-heading span,.series-card-heading small{align-items:center;gap:7px;display:inline-flex}.series-card-heading.correction{color:var(--violet-700)}.series-content-card h2{color:var(--ink);margin:15px 0 10px;font-size:clamp(23px,3vw,31px)}.series-content-card>p{color:var(--ink-soft);white-space:pre-line;line-height:1.65}.series-formulas{gap:12px;margin:24px 0;display:grid}.series-formulas>div{border:1px solid var(--violet-200);background:var(--violet-100);text-align:center;border-radius:14px;padding:18px;overflow-x:auto}.series-source-visual{border:1px solid var(--violet-200);background:var(--surface-soft);border-radius:16px;margin:24px 0;padding:18px}.series-source-visual figcaption{color:var(--violet-700);text-transform:uppercase;letter-spacing:.04em;margin-bottom:14px;font-size:12px;font-weight:800}.series-source-crops>div{gap:16px;display:grid}.series-source-crops img{border:1px solid var(--line);object-fit:contain;background:#fff;border-radius:10px;width:auto;max-width:100%;max-height:620px;margin:0 auto;display:block}.series-source-table-scroll{border:1px solid var(--line);background:#fff;border-radius:10px;max-width:100%;overflow-x:auto}.series-source-table{border-collapse:collapse;width:100%;min-width:620px;color:var(--ink);text-align:center}.series-source-table caption{color:var(--violet-800);text-align:left;padding:12px 14px;font-weight:800}.series-source-table th,.series-source-table td{border:1px solid var(--line);vertical-align:middle;padding:12px 14px}.series-source-table th{background:var(--violet-100);color:var(--violet-800);font-weight:800}.series-source-table tbody td:first-child{font-weight:750}.series-source-visual-grid{grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:16px;display:grid}.series-source-visual-stage{border:1px solid var(--line);background:var(--surface);border-radius:13px;justify-items:center;gap:8px;padding:14px;display:grid}.series-source-visual-stage svg{aspect-ratio:1;width:min(100%,280px)}.series-source-visual-stage polyline{fill:var(--violet-100)}@supports (color:color-mix(in lab, red, red)){.series-source-visual-stage polyline{fill:color-mix(in srgb, var(--violet-100) 65%, transparent)}}.series-source-visual-stage polyline{stroke:var(--violet-700);stroke-width:2.25px;stroke-linecap:round;stroke-linejoin:round}.series-source-visual-stage strong{color:var(--violet-800);font-size:16px}.series-primitive-graphs>.series-primitive-graph-panel{max-width:470px;margin:0 auto 18px}.series-primitive-graph-choices{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;display:grid}.series-primitive-graph-panel{border:1px solid var(--line);background:var(--surface);text-align:center;border-radius:13px;padding:13px}.series-primitive-graph-panel>strong{color:var(--ink);margin-bottom:8px;display:block}.series-primitive-graph-panel svg{border:1px solid var(--line);background:#fff;width:100%;display:block}.series-log-study-figure svg{border:1px solid var(--line);background:#fff;border-radius:12px;width:100%;max-width:760px;margin:0 auto;display:block}.series-log-study-figure svg pattern path{fill:none;stroke:var(--ink-soft)}@supports (color:color-mix(in lab, red, red)){.series-log-study-figure svg pattern path{stroke:color-mix(in srgb, var(--ink-soft) 18%, transparent)}}.series-log-study-figure svg pattern path{stroke-width:1px}.series-log-study-figure .axis{stroke:var(--ink);stroke-width:1.5px}.series-log-study-figure .curve{fill:none;stroke:var(--violet-700);stroke-width:4px;stroke-linecap:round}.series-log-study-figure .asymptote,.series-log-study-figure .vertical-asymptote{stroke:var(--coral-600);stroke-width:2px;stroke-dasharray:8 7}.series-log-study-figure text{fill:var(--coral-700);font-size:15px;font-weight:800}.series-complex-plane svg{border:1px solid var(--line);background:#fff;border-radius:12px;width:100%;max-width:760px;margin:0 auto;display:block}.series-complex-plane pattern path{fill:none;stroke:var(--ink-soft)}@supports (color:color-mix(in lab, red, red)){.series-complex-plane pattern path{stroke:color-mix(in srgb, var(--ink-soft) 17%, transparent)}}.series-complex-plane pattern path{stroke-width:1px}.series-complex-plane .axis{stroke:var(--ink);stroke-width:1.6px}.series-complex-plane .segment,.series-complex-plane .circle,.series-complex-plane .construction{fill:none;stroke:var(--violet-700);stroke-width:3px}.series-complex-plane .construction{stroke:var(--coral-600);stroke-dasharray:8 7}.series-complex-plane .point{fill:var(--violet-700);stroke:#fff;stroke-width:2px}.series-complex-plane text{fill:var(--ink);font-size:16px;font-weight:800}.series-primitive-graph-panel pattern path{fill:none;stroke:#d8d8df;stroke-width:.7px}.series-primitive-graph-panel .axis{stroke:#23202d;stroke-width:2px}.series-primitive-graph-panel .curve{fill:none;stroke:var(--violet-700);stroke-width:3.25px;stroke-linecap:round;stroke-linejoin:round}@media (width<=620px){.series-primitive-graph-choices{grid-template-columns:1fr}}.series-source{color:var(--ink-soft);align-items:center;gap:7px;font-size:12px;display:flex}.series-correction-card>ol{gap:13px;margin:24px 0;padding:0;list-style:none;display:grid}.series-correction-card>ol>li{background:var(--surface-soft);border-radius:13px;grid-template-columns:30px minmax(0,1fr);align-items:start;gap:12px;min-width:0;padding:15px;display:grid}.series-correction-card>ol>li>i{color:#fff;background:var(--violet-600);border-radius:50%;place-items:center;width:28px;height:28px;font-size:12px;font-style:normal;font-weight:800;display:grid}.series-correction-card>ol>li>p{width:100%;min-width:0;color:var(--ink);white-space:pre-line;overflow-wrap:normal;word-break:normal;margin:2px 0 0;line-height:1.65}.series-correction-card>ol>li>p>.inline-math-text{width:100%;max-width:100%;display:block}.series-correction-card>ol>li .inline-math-text .katex-display{box-sizing:border-box;width:100%;max-width:100%;margin:12px 0;padding-bottom:4px;display:block;overflow:auto hidden}.series-correction-card>ol>li .katex-display>.katex{white-space:nowrap;min-width:max-content;display:inline-block}.series-final-answer{border:1px solid var(--violet-300);color:var(--violet-800);background:var(--violet-100);border-radius:15px;gap:12px;padding:18px;display:flex}.series-final-answer p{margin:5px 0 0}.series-card-actions{justify-content:space-between;gap:14px;margin-top:28px;display:flex}@media (width<=720px){.exercise-course-feature{grid-template-columns:1fr}.exercise-course-feature>.button{width:100%}.series-exercise-header{align-items:flex-start}.series-exercise-counter{min-width:72px}.series-card-actions{flex-direction:column-reverse}.series-card-actions .button{width:100%}}.exercise-card{min-height:260px;padding:23px}.exercise-card-head{justify-content:space-between;align-items:center;display:flex}.difficulty{border-radius:999px;padding:5px 8px;font-size:8px;font-weight:750}.difficulty-1{color:#b45309;background:#fef3c7}.difficulty-2{color:var(--green-600);background:var(--green-100)}.difficulty-3{color:var(--coral-600);background:var(--coral-100)}.exercise-card h3{margin:22px 0 8px;font-size:17px}.exercise-card>p{min-height:52px;color:var(--ink-soft);font-size:11px;line-height:1.55}.exercise-card .exercise-meta{gap:13px;margin:16px 0;display:flex}.exercise-card .exercise-meta span{color:var(--ink-faint)}.exercise-card>a{color:var(--violet-600);justify-content:space-between;align-items:center;font-size:10px;font-weight:800;display:flex}.exam-feature{background:radial-gradient(circle at 85% 20%, #f43f781a, transparent 27%), var(--surface);grid-template-columns:1.25fr .75fr;min-height:350px;display:grid;overflow:hidden}.exam-feature-copy{padding:36px}.exam-feature h2{margin:22px 0 10px;font-size:29px}.exam-feature-copy>p{max-width:640px;color:var(--ink-soft);font-size:12px;line-height:1.65}.exam-facts{gap:28px;margin:25px 0;display:flex}.exam-facts>span{align-items:center;gap:8px;display:flex}.exam-facts svg{color:var(--violet-600)}.exam-facts div{flex-direction:column;gap:2px;display:flex}.exam-facts small{color:var(--ink-faint);font-size:8px}.exam-facts strong{font-size:12px}.exam-paper{color:#332b48;background:#fff;border:1px solid #e7e2ee;border-radius:8px;place-self:center;width:230px;min-height:280px;padding:28px;position:relative;transform:rotate(3deg);box-shadow:20px 24px 50px #2f1d522b}.exam-paper:before{z-index:-1;content:"";background:#f9f7fd;border:1px solid #e7e2ee;border-radius:8px;position:absolute;inset:8px -10px -10px 10px}.exam-paper span{color:var(--violet-600);letter-spacing:.12em;font-size:8px;font-weight:800;display:block}.exam-paper strong{margin:10px 0 28px;font-size:19px;display:block}.exam-paper i{background:#eeeaf4;border-radius:999px;height:5px;margin:10px 0;display:block}.exam-paper i:nth-of-type(2){width:80%}.exam-paper i:nth-of-type(3){width:62%}.exam-paper em{color:var(--coral-500);font-size:14px;font-style:normal;font-weight:800;position:absolute;bottom:19px;right:20px}.exam-list{gap:10px;display:grid}.exam-row{grid-template-columns:auto minmax(0,1fr) 95px 95px 38px;align-items:center;gap:15px;padding:16px 18px;display:grid}.exam-row-icon{border-radius:12px;place-items:center;width:44px;height:44px;display:grid}.exam-row h3{margin-bottom:4px;font-size:14px}.exam-row p{color:var(--ink-faint);margin-bottom:0;font-size:9px}.exam-row>span:not(.exam-row-icon){flex-direction:column;gap:3px;display:flex}.exam-row small{color:var(--ink-faint);font-size:8px}.exam-row strong{font-size:10px}.exam-row>a{width:35px;height:35px;color:var(--violet-600);background:var(--violet-50);border-radius:9px;place-items:center;display:grid}.exam-workspace-head{justify-content:space-between;align-items:center;margin-bottom:20px;display:flex}.exam-workspace-head h1{margin-bottom:0;font-size:28px}.exam-timer{color:var(--coral-600);background:var(--coral-100);border:1px solid #f43f7833;border-radius:11px;align-items:center;gap:8px;padding:11px 14px;font-weight:800;display:flex}.exam-workspace-grid{grid-template-columns:minmax(0,1fr) 250px;gap:15px;display:grid}.exam-question-panel{padding:30px}.question-toolbar{color:var(--ink-faint);justify-content:space-between;align-items:center;margin-bottom:25px;font-size:10px;display:flex}.question-toolbar button{color:var(--ink-faint);background:var(--surface-soft);border-radius:8px;align-items:center;gap:6px;padding:7px 9px;font-size:9px;display:inline-flex}.question-toolbar button.active{color:var(--coral-600);background:var(--coral-100)}.exam-question-panel h2{margin-bottom:21px;font-size:19px}.exam-formula{margin-bottom:25px}.compact-keyboard{grid-template-columns:repeat(10,1fr)}.question-navigator{align-self:start;padding:20px}.question-navigator>strong{margin-bottom:15px;font-size:13px;display:block}.question-navigator>div:first-of-type{grid-template-columns:repeat(4,1fr);gap:7px;display:grid}.question-navigator button:not(.button){border:1px solid var(--line);background:var(--surface-soft);border-radius:8px;min-height:36px;font-size:10px}.question-navigator button.active{color:#fff;border-color:var(--violet-600);background:var(--violet-600)}.question-navigator button.answered:not(.active){color:var(--green-600);background:var(--green-100);border-color:#22c55e33}.navigator-legend{color:var(--ink-faint);gap:7px;margin:18px 0;font-size:8px;display:grid}.navigator-legend span{align-items:center;gap:6px;display:flex}.navigator-legend i{border:1px solid var(--line);background:var(--surface-soft);border-radius:2px;width:8px;height:8px}.navigator-legend i.answered{border-color:var(--green-500);background:var(--green-100)}.notebook-toolbar{justify-content:space-between;align-items:center;gap:18px;margin-bottom:17px;display:flex}.notebook-tabs button span{background:var(--surface-soft);border-radius:999px;padding:3px 6px;font-size:8px}.notebook-tabs button.active span{color:var(--violet-600);background:#fff}.notebook-grid{grid-template-columns:repeat(3,1fr);gap:14px;display:grid}.notebook-card{min-height:260px;padding:22px}.notebook-card-head{justify-content:space-between;align-items:center;display:flex}.notebook-card-head button,.notebook-card-footer button{width:34px;height:34px;color:var(--violet-600);background:var(--surface-soft);border-radius:9px;place-items:center;display:grid}.note-tag{color:var(--violet-600);background:var(--violet-50);border-radius:999px;margin-top:19px;padding:5px 8px;font-size:8px;font-weight:750;display:inline-block}.notebook-card h2{margin:13px 0 8px;font-size:16px}.notebook-card>p{min-height:56px;color:var(--ink-soft);font-size:11px;line-height:1.55}.notebook-card-footer{border-top:1px solid var(--line);justify-content:space-between;align-items:center;margin-top:19px;padding-top:14px;display:flex}.notebook-card-footer>span{color:var(--ink-faint);align-items:center;gap:5px;font-size:8px;display:flex}.notebook-card-footer button{width:28px;height:28px;font-size:10px}.progress-kpi-grid{grid-template-columns:1.5fr repeat(3,.5fr);gap:13px;display:grid}.readiness-card{align-items:center;gap:25px;padding:24px;display:flex}.progress-ring.large{width:116px;height:116px}.progress-ring.large:before{width:86px;height:86px}.readiness-card h2{margin:5px 0;font-size:19px}.readiness-card p{color:var(--green-600);margin:0;font-size:9px}.kpi-card{flex-direction:column;justify-content:space-between;padding:19px;display:flex}.kpi-card strong{margin-top:17px;font-size:23px}.kpi-card p{color:var(--ink-faint);margin-bottom:0;font-size:9px}.progress-content-grid{grid-template-columns:1.1fr .9fr;gap:14px;margin-top:14px;display:grid}.activity-chart-card,.mastery-list-card{min-height:315px;padding:24px}.activity-chart-card .card-header>span{color:var(--violet-600);font-size:17px;font-weight:850}.activity-bars{align-items:flex-end;gap:13px;height:205px;margin-top:22px;display:flex}.activity-bars>div{flex-direction:column;flex:1;align-items:center;gap:8px;height:100%;display:flex}.activity-bars span{background:var(--surface-soft);border-radius:6px;width:100%;height:100%;position:relative;overflow:hidden}.activity-bars i{background:linear-gradient(to top, var(--violet-600), #c4b5fd);border-radius:6px;position:absolute;bottom:0;left:0;right:0}.activity-bars small{color:var(--ink-faint);font-size:8px}.mastery-list-card .card-header{margin-bottom:26px}.mastery-row{margin-bottom:22px}.mastery-row>div{justify-content:space-between;margin-bottom:8px;font-size:10px;display:flex}.mastery-row strong{color:var(--violet-600)}.mastery-row-link{color:inherit;text-decoration:none;transition:opacity .18s;display:block}.mastery-row-link:hover{opacity:.78}.progress-empty-copy{color:var(--ink-soft);font-size:12px;line-height:1.55}.progress-subject-summary{margin-top:14px;padding:24px}.progress-summary-total{color:var(--violet-600);font-size:11px;font-weight:800}.progress-subject-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px 26px;margin-top:25px;display:grid}.progress-subject-row>div{justify-content:space-between;align-items:center;gap:12px;margin-bottom:8px;font-size:11px;display:flex}.progress-subject-row>div span{color:var(--violet-600);font-weight:850}.progress-subject-row>span{background:var(--surface-soft);border-radius:999px;height:7px;display:block;overflow:hidden}.progress-subject-row i{border-radius:inherit;background:linear-gradient(90deg, var(--violet-600), var(--teal-500));height:100%;transition:width .35s;display:block}.settings-back-button{border:1px solid var(--line);background:var(--surface);color:var(--ink-secondary);cursor:pointer;border-radius:10px;align-items:center;gap:6px;margin-bottom:8px;padding:6px 14px 6px 10px;font-size:13px;font-weight:600;transition:background .18s,color .18s,border-color .18s;display:inline-flex}.settings-back-button:hover{background:var(--surface-hover);color:var(--ink);border-color:var(--violet-400)}.rtl .settings-back-button svg{transform:scaleX(-1)}.settings-stack{gap:14px;display:grid}.settings-card{padding:25px}.settings-card-title{align-items:flex-start;gap:12px;margin-bottom:23px;display:flex}.settings-card-title>svg{color:var(--violet-600)}.settings-card-title h2{margin-bottom:4px;font-size:16px}.settings-card-title p{color:var(--ink-faint);margin-bottom:0;font-size:9px}.settings-form-grid{grid-template-columns:repeat(2,1fr);gap:14px;display:grid}.settings-form-grid label{margin:0}.settings-field-help{color:var(--ink-faint);font-size:10px;line-height:1.5}.setup-program-select{border:1px solid var(--line);background:var(--surface);width:100%;min-height:52px;color:var(--text);font:inherit;border-radius:14px;padding:0 44px 0 16px;font-weight:650}.course-language-note,.interface-language-explainer{border:1px solid var(--primary);align-items:center;gap:9px;margin-top:12px;padding:11px 13px;display:flex}@supports (color:color-mix(in lab, red, red)){.course-language-note,.interface-language-explainer{border:1px solid color-mix(in srgb, var(--primary) 18%, var(--line))}}.course-language-note,.interface-language-explainer{background:var(--primary);border-radius:12px}@supports (color:color-mix(in lab, red, red)){.course-language-note,.interface-language-explainer{background:color-mix(in srgb, var(--primary) 7%, var(--surface))}}.course-language-note,.interface-language-explainer{color:var(--muted);line-height:1.5}.course-language-note svg,.interface-language-explainer svg{color:var(--primary);flex:none}.course-language-field{color:var(--muted);align-items:center;gap:5px;display:flex}.course-language-field svg{color:var(--primary)}.program-context-banner{border:1px solid var(--primary);grid-template-columns:auto minmax(0,1fr) auto auto;align-items:center;gap:13px;margin:0 0 22px;padding:13px 15px;display:grid}@supports (color:color-mix(in lab, red, red)){.program-context-banner{border:1px solid color-mix(in srgb, var(--primary) 18%, var(--line))}}.program-context-banner{background:var(--primary);border-radius:15px}@supports (color:color-mix(in lab, red, red)){.program-context-banner{background:color-mix(in srgb, var(--primary) 6%, var(--surface))}}.program-context-banner>span:first-child{background:var(--primary);border-radius:11px;place-items:center;width:38px;height:38px;display:grid}@supports (color:color-mix(in lab, red, red)){.program-context-banner>span:first-child{background:color-mix(in srgb, var(--primary) 12%, var(--surface))}}.program-context-banner>span:first-child{color:var(--primary)}.program-context-banner div{gap:2px;min-width:0;display:grid}.program-context-banner small{color:var(--muted)}.program-context-banner strong{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.program-context-banner>a{color:var(--primary);font-weight:750}.program-language-badge{background:var(--surface);color:var(--primary);white-space:nowrap;border-radius:999px;padding:6px 9px;font-size:.78rem;font-weight:750}.program-empty-state{border:1px dashed var(--primary);grid-column:1/-1;justify-items:center;gap:9px;padding:42px 22px;display:grid}@supports (color:color-mix(in lab, red, red)){.program-empty-state{border:1px dashed color-mix(in srgb, var(--primary) 28%, var(--line))}}.program-empty-state{background:var(--primary);border-radius:18px}@supports (color:color-mix(in lab, red, red)){.program-empty-state{background:color-mix(in srgb, var(--primary) 4%, var(--surface))}}.program-empty-state{text-align:center}.program-empty-state>svg{color:var(--primary)}.program-empty-state h2,.program-empty-state p{margin:0}.program-empty-state p{color:var(--muted)}.curriculum-subject-list{gap:18px;display:grid}.curriculum-subject-card{--subject-card-bg:var(--primary)}@supports (color:color-mix(in lab, red, red)){.curriculum-subject-card{--subject-card-bg:color-mix(in srgb, var(--primary) 11%, var(--surface))}}.curriculum-subject-card{border:2px solid var(--primary);grid-template-columns:minmax(0,1fr) clamp(280px,35vw,430px);min-height:280px;display:grid;position:relative;overflow:hidden}@supports (color:color-mix(in lab, red, red)){.curriculum-subject-card{border:2px solid color-mix(in srgb, var(--primary) 46%, var(--line))}}.curriculum-subject-card{background:radial-gradient(circle at 12% 12%, var(--primary), transparent 48%), var(--subject-card-bg);border-radius:24px}@supports (color:color-mix(in lab, red, red)){.curriculum-subject-card{background:radial-gradient(circle at 12% 12%, color-mix(in srgb, var(--primary) 16%, transparent), transparent 48%), var(--subject-card-bg)}}.curriculum-subject-card{box-shadow:inset 0 0 0 1px var(--primary), 0 16px 38px var(--primary)}@supports (color:color-mix(in lab, red, red)){.curriculum-subject-card{box-shadow:inset 0 0 0 1px color-mix(in srgb, var(--primary) 4%, transparent), 0 16px 38px color-mix(in srgb, var(--primary) 7%, transparent)}}.curriculum-subject-card.coming-soon{--subject-card-bg:var(--primary)}@supports (color:color-mix(in lab, red, red)){.curriculum-subject-card.coming-soon{--subject-card-bg:color-mix(in srgb, var(--primary) 6%, var(--surface))}}.curriculum-subject-card.coming-soon{border-color:var(--primary)}@supports (color:color-mix(in lab, red, red)){.curriculum-subject-card.coming-soon{border-color:color-mix(in srgb, var(--primary) 38%, var(--line))}}.curriculum-subject-card.coming-soon{box-shadow:none;border-style:dashed}.curriculum-subject-content{z-index:2;flex-direction:column;align-items:flex-start;padding:clamp(24px,3vw,36px);display:flex;position:relative}.curriculum-subject-topline{align-items:center;gap:10px;width:100%;margin-bottom:18px;display:flex}.curriculum-subject-topline .subject-icon.large{flex:none;width:48px;height:48px}.subject-coefficient{border:1px solid var(--primary);padding:6px 10px}@supports (color:color-mix(in lab, red, red)){.subject-coefficient{border:1px solid color-mix(in srgb, var(--primary) 15%, var(--line))}}.subject-coefficient{background:var(--primary);border-radius:999px}@supports (color:color-mix(in lab, red, red)){.subject-coefficient{background:color-mix(in srgb, var(--primary) 6%, var(--surface))}}.subject-coefficient{color:var(--text);white-space:nowrap;font-size:.78rem;font-weight:800}.curriculum-subject-card.coming-soon .status-chip{border-color:var(--primary)}@supports (color:color-mix(in lab, red, red)){.curriculum-subject-card.coming-soon .status-chip{border-color:color-mix(in srgb, var(--primary) 38%, var(--line))}}.curriculum-subject-card.coming-soon .status-chip{color:var(--primary)}@supports (color:color-mix(in lab, red, red)){.curriculum-subject-card.coming-soon .status-chip{color:color-mix(in srgb, var(--primary) 88%, var(--text))}}.curriculum-subject-card.coming-soon .status-chip{background:var(--primary)}@supports (color:color-mix(in lab, red, red)){.curriculum-subject-card.coming-soon .status-chip{background:color-mix(in srgb, var(--primary) 13%, var(--surface))}}.curriculum-subject-card.coming-soon .status-chip{font-size:.72rem}.curriculum-subject-card h2{color:var(--text);margin:0 0 9px;font-size:clamp(1.35rem,2.2vw,1.85rem);line-height:1.14}.curriculum-subject-card p{max-width:630px;color:var(--muted);margin:0 0 18px;line-height:1.65}.curriculum-subject-meta{color:var(--muted);flex-wrap:wrap;align-items:center;gap:10px 18px;margin-bottom:22px;font-size:.88rem;display:flex}.curriculum-subject-meta span{align-items:center;gap:6px;display:inline-flex}.curriculum-subject-meta svg{color:var(--primary)}.curriculum-subject-meta strong{color:var(--text)}.curriculum-subject-progress{width:min(100%,630px);margin:-8px 0 20px}.curriculum-subject-progress>span{background:var(--line);border-radius:999px;height:6px;display:block;overflow:hidden}@supports (color:color-mix(in lab, red, red)){.curriculum-subject-progress>span{background:color-mix(in srgb, var(--line) 78%, transparent)}}.curriculum-subject-progress i{border-radius:inherit;background:linear-gradient(90deg, var(--violet-600), var(--teal-500));height:100%;transition:width .35s;display:block}.curriculum-subject-content>.button,.curriculum-soon-label{margin-top:auto}.curriculum-soon-label{border:1px solid var(--primary);align-items:center;min-height:42px;padding:0 14px;display:inline-flex}@supports (color:color-mix(in lab, red, red)){.curriculum-soon-label{border:1px solid color-mix(in srgb, var(--primary) 30%, var(--line))}}.curriculum-soon-label{background:var(--primary);border-radius:12px}@supports (color:color-mix(in lab, red, red)){.curriculum-soon-label{background:color-mix(in srgb, var(--primary) 13%, var(--surface))}}.curriculum-soon-label{color:var(--primary)}@supports (color:color-mix(in lab, red, red)){.curriculum-soon-label{color:color-mix(in srgb, var(--primary) 88%, var(--text))}}.curriculum-soon-label{cursor:not-allowed;opacity:.82;font-size:.88rem;font-weight:800}.curriculum-subject-art{background:var(--subject-card-bg);min-width:0;position:relative}.curriculum-subject-art:after{z-index:1;background:linear-gradient(90deg, var(--subject-card-bg) 0%, var(--subject-card-bg) 18%, var(--subject-card-bg) 39%, transparent 68%);position:absolute;inset:0}@supports (color:color-mix(in lab, red, red)){.curriculum-subject-art:after{background:linear-gradient(90deg, var(--subject-card-bg) 0%, color-mix(in srgb, var(--subject-card-bg) 86%, transparent) 18%, color-mix(in srgb, var(--subject-card-bg) 42%, transparent) 39%, transparent 68%)}}.curriculum-subject-art:after{content:"";pointer-events:none}.curriculum-subject-art img{object-fit:cover;object-position:center;opacity:.82;width:100%;height:100%;min-height:280px;display:block;-webkit-mask-image:linear-gradient(90deg,#0000 0%,#00000029 18%,#000000b3 48%,#000 76%);mask-image:linear-gradient(90deg,#0000 0%,#00000029 18%,#000000b3 48%,#000 76%);-webkit-mask-size:100% 100%;mask-size:100% 100%;-webkit-mask-repeat:no-repeat;mask-repeat:no-repeat}.curriculum-subject-art-fallback{width:100%;height:100%;min-height:280px;color:var(--primary);place-items:center;display:grid}@supports (color:color-mix(in lab, red, red)){.curriculum-subject-art-fallback{color:color-mix(in srgb, var(--primary) 68%, var(--muted))}}.curriculum-subject-art-fallback{background:radial-gradient(circle, var(--primary), transparent 62%)}@supports (color:color-mix(in lab, red, red)){.curriculum-subject-art-fallback{background:radial-gradient(circle, color-mix(in srgb, var(--primary) 18%, transparent), transparent 62%)}}.program-catalog-error{border:1px solid var(--danger);margin-bottom:18px;padding:12px 14px}@supports (color:color-mix(in lab, red, red)){.program-catalog-error{border:1px solid color-mix(in srgb, var(--danger) 38%, var(--line))}}.program-catalog-error{background:var(--danger);border-radius:12px}@supports (color:color-mix(in lab, red, red)){.program-catalog-error{background:color-mix(in srgb, var(--danger) 8%, var(--surface))}}.program-catalog-error{color:var(--text)}.curriculum-subject-card.coming-soon .curriculum-subject-art img{filter:saturate(.78);opacity:.68}.rtl .curriculum-subject-art:after{background:linear-gradient(270deg, var(--subject-card-bg) 0%, var(--subject-card-bg) 18%, var(--subject-card-bg) 39%, transparent 68%)}@supports (color:color-mix(in lab, red, red)){.rtl .curriculum-subject-art:after{background:linear-gradient(270deg, var(--subject-card-bg) 0%, color-mix(in srgb, var(--subject-card-bg) 86%, transparent) 18%, color-mix(in srgb, var(--subject-card-bg) 42%, transparent) 39%, transparent 68%)}}.rtl .curriculum-subject-art img{-webkit-mask-image:linear-gradient(270deg,#0000 0%,#00000029 18%,#000000b3 48%,#000 76%);mask-image:linear-gradient(270deg,#0000 0%,#00000029 18%,#000000b3 48%,#000 76%)}@media (width<=720px){.program-context-banner{grid-template-columns:auto minmax(0,1fr) auto}.program-language-badge{grid-column:2/-1;justify-self:start}.curriculum-subject-card{grid-template-columns:minmax(0,1fr) clamp(110px,28vw,180px);min-height:250px}.curriculum-subject-content{padding:22px}.curriculum-subject-art img{opacity:.74;min-height:250px}}@media (width<=520px){.curriculum-subject-card{min-height:0;display:block}.curriculum-subject-art{display:none}.curriculum-subject-topline{flex-wrap:wrap;align-items:flex-start}}.settings-form-grid input,.settings-form-grid select{min-height:43px}.toggle-row{justify-content:space-between;align-items:center;display:flex}.toggle-row>div{flex-direction:column;gap:4px;display:flex}.toggle-row strong{font-size:11px}.toggle-row span{color:var(--ink-faint);font-size:9px}.toggle-row input{appearance:none;background:var(--line-strong);border-radius:999px;width:42px;height:23px;transition:background .2s;position:relative}.toggle-row input:before{content:"";background:#fff;border-radius:50%;width:17px;height:17px;transition:transform .2s;position:absolute;top:3px;left:3px;box-shadow:0 2px 6px #00000029}.toggle-row input:checked{background:var(--violet-600)}.toggle-row input:checked:before{transform:translate(19px)}.rtl .toggle-row input:before{left:auto;right:3px}.rtl .toggle-row input:checked:before{transform:translate(-19px)}.theme-choices{grid-template-columns:repeat(2,minmax(0,220px));gap:10px;display:grid}.theme-choices button{border:1px solid var(--line);text-align:start;background:var(--surface-soft);border-radius:13px;grid-template-columns:auto 1fr auto;align-items:center;gap:10px;min-height:88px;padding:16px;display:grid}.theme-choices button.selected{color:var(--violet-600);border-color:var(--violet-500);background:var(--violet-50)}.theme-dark .theme-choices button.selected{background:#7c3aed21}.settings-save{justify-content:flex-end;display:flex}.rtl .settings-save{justify-content:flex-start}.ai-coming-page,.not-found{border:1px solid var(--line);border-radius:var(--radius-lg);background:radial-gradient(circle at 50% 32%, #8b5cf629, transparent 30%), var(--surface);text-align:center;flex-direction:column;justify-content:center;align-items:center;min-height:620px;padding:40px;display:flex;position:relative;overflow:hidden}.ai-glow{filter:blur(60px);background:#8b5cf638;border-radius:50%;width:180px;height:180px;position:absolute;top:90px}.ai-icon{z-index:1;width:84px;height:84px;color:var(--violet-600);background:var(--violet-100);box-shadow:var(--shadow-violet);border:1px solid #8b5cf633;border-radius:25px;place-items:center;margin-bottom:20px;display:grid;position:relative}.ai-coming-page h1,.not-found h1{letter-spacing:-.05em;max-width:680px;margin:20px 0 12px;font-size:clamp(32px,4vw,47px)}.ai-coming-page>p,.not-found p{max-width:620px;color:var(--ink-soft);margin-bottom:25px;line-height:1.7}.ai-feature-list{flex-wrap:wrap;justify-content:center;gap:10px 19px;margin-bottom:27px;display:flex}.ai-feature-list span{color:var(--ink-soft);align-items:center;gap:6px;font-size:11px;display:inline-flex}.ai-feature-list svg{color:var(--teal-500)}.not-found>span{color:var(--violet-100);text-shadow:-1px 0 var(--violet-500), 0 1px var(--violet-500), 1px 0 var(--violet-500), 0 -1px var(--violet-500);font-size:110px;font-weight:900;line-height:.85}.toast{z-index:100;min-height:48px;color:var(--green-600);background:var(--surface);box-shadow:var(--shadow-md);border:1px solid #22c55e38;border-radius:12px;align-items:center;gap:9px;padding:0 15px;font-size:11px;font-weight:750;animation:.25s both toast-in;display:flex;position:fixed;bottom:24px;right:24px}.rtl .toast{left:24px;right:auto}.mobile-menu-button,.sidebar-close-mobile,.mobile-bottom-nav,.mobile-overlay{display:none}@keyframes toast-in{0%{opacity:0;transform:translateY(10px)}}@media (width<=1100px){.landing-links{display:none}.hero-grid{grid-template-columns:1fr .95fr;gap:30px}.quick-grid,.progress-kpi-grid{grid-template-columns:repeat(3,1fr)}.readiness-card{grid-column:1/-1}.practice-orbit{opacity:.6}}@media (width<=900px){.hero-grid{grid-template-columns:1fr;padding-top:70px}.hero-copy{max-width:700px}.hero-preview{min-height:430px}.preview-window{right:50%;transform:translate(50%)}.split-heading,.product-story{grid-template-columns:1fr;gap:35px}.benefit-grid,.method-steps{grid-template-columns:repeat(2,1fr)}.step-arrow{display:none}.auth-page{grid-template-columns:1fr}.auth-visual{min-height:360px}.auth-visual-copy{margin-top:90px}.auth-roadmap-mini,.auth-quote,.auth-formula-motion,.auth-sigma-mark{display:none}.secondary-shell,.secondary-shell.sidebar-collapsed{display:block}.sidebar{width:250px;transition:transform .25s;position:fixed;top:0;left:0;transform:translate(-104%)}.rtl .sidebar{left:auto;right:0;transform:translate(104%)}.sidebar.mobile-open{transform:translate(0)}.sidebar-collapsed .sidebar{width:250px}.sidebar-collapsed .sidebar-head{justify-content:space-between}.sidebar-collapsed .sidebar .brand span,.sidebar-collapsed .sidebar-link span,.sidebar-collapsed .sidebar-link small,.sidebar-collapsed .sidebar-collapse span{display:inline}.sidebar-collapsed .sidebar .brand{display:inline-flex}.sidebar-collapsed .sidebar-link,.sidebar-collapsed .sidebar-collapse{justify-content:flex-start;padding:0 13px}.mobile-overlay.visible{z-index:40;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:#0905198c;display:block;position:fixed;inset:0}.mobile-menu-button,.sidebar-close-mobile{display:grid}.sidebar-close-mobile{color:#fff;background:#ffffff0d;border-color:#ffffff1f}.sidebar-collapse{display:none}.home-hero-grid,.home-bottom-grid,.featured-subject,.exam-feature,.progress-content-grid,.learn-layout,.exam-workspace-grid{grid-template-columns:1fr}.learn-side-panel{grid-row:1;grid-template-columns:1fr 1fr;padding-top:0}.lesson-progress-card{grid-column:1/-1}.featured-math-visual,.featured-physics-visual{min-height:260px}.chapter-grid{grid-template-columns:1fr 1fr}.notebook-grid,.exercise-card-grid{grid-template-columns:repeat(2,1fr)}.notebook-toolbar{flex-direction:column;align-items:stretch}.compact-search{width:100%}.exam-paper{margin-bottom:40px}.question-navigator{order:-1}}@media (width<=680px){.landing-nav,.hero-grid,.section,.final-cta,.landing-footer,.home-main{width:min(100% - 30px,1160px)}.landing-nav{min-height:68px}.landing-actions .hero-theme,.landing-actions .nav-signin{display:none}.hero-grid{padding-top:50px}.hero-copy h1{font-size:45px}.hero-copy>p{font-size:15px}.hero-ctas{flex-direction:column;align-items:stretch}.hero-ctas .button{width:100%}.hero-preview{min-height:350px}.preview-window{width:100%;top:28px}.formula-chip{display:none}.section{padding:75px 0}.method-section,.faq-section{width:100%;padding-left:15px;padding-right:15px}.benefit-grid,.method-steps,.subject-showcase-grid,.quick-grid,.chapter-grid,.exercise-card-grid,.notebook-grid,.settings-form-grid{grid-template-columns:1fr}.final-cta{grid-template-columns:1fr;justify-items:start;padding:30px}.landing-footer{grid-template-columns:1fr}.footer-links{flex-wrap:wrap}.auth-visual{min-height:290px;padding:28px}.auth-back{top:31px;right:25px}.rtl .auth-back{left:25px}.auth-visual-copy{margin-top:80px}.auth-visual-copy h1{font-size:38px}.auth-formula{padding:8px 11px;font-size:14px}.auth-formula-energy{top:22%;left:8%}.auth-formula-force{top:35%;right:7%}.auth-formula-limit{top:15%;right:27%}.auth-atom-mark{top:7%;right:7%}.auth-form-side{padding:75px 22px 45px}.setup-card{padding:30px 20px}.choice-grid.two,.choice-grid.three{grid-template-columns:1fr}.choice-card{min-height:100px}.setup-actions{grid-template-columns:1fr;display:grid}.setup-actions .button{width:100%}.app-header{min-height:64px;padding:0 15px}.app-header-actions>.icon-button:first-child,.app-header-actions .language-toggle,.profile-chip>div,.profile-chip>svg{display:none}.profile-chip{padding:4px}.home-main{padding-top:27px;padding-bottom:100px}.welcome-row{flex-direction:column;align-items:flex-start;gap:15px}.continue-card{min-height:390px;padding:23px}.continue-decoration{opacity:.45}.progress-overview{align-items:flex-start}.progress-stats{grid-template-columns:1fr}.quick-grid{grid-template-columns:repeat(2,1fr)}.quick-card{min-height:180px}.home-roadmap{grid-template-columns:repeat(5,90px);padding-bottom:7px;overflow-x:auto}.objective-card{grid-template-columns:1fr}.objective-card .button{grid-column:1}.page-main{width:calc(100% - 30px);padding-top:26px;padding-bottom:100px}.page-heading,.learn-heading,.exam-workspace-head{flex-direction:column;align-items:flex-start}.page-heading .button,.page-heading .compact-search{width:100%}.featured-subject-content{padding:25px}.featured-subject-content>.status-chip{margin-top:15px;position:static}.featured-stats{justify-content:space-between;gap:15px}.math-graph{width:235px;right:50%;transform:translate(50%)}.roadmap-page-card,.lesson-card,.exercise-workspace,.exam-question-panel{padding:22px 18px}.roadmap-page-line{left:45px}.rtl .roadmap-page-line{right:45px}.roadmap-page-node{grid-template-columns:45px 1fr;gap:10px}.roadmap-page-bubble{width:45px;height:45px}.roadmap-node-card{grid-template-columns:1fr}.node-status{justify-self:start}.learn-side-panel{grid-template-columns:1fr}.lesson-progress-card{grid-column:auto}.science-keyboard{grid-template-columns:repeat(4,1fr)}.composition-visual{gap:7px;padding:20px 8px}.function-box{min-width:58px;height:49px;font-size:14px}.practice-orbit{opacity:.28;right:-50px}.exam-facts{flex-direction:column;align-items:flex-start}.exam-row{grid-template-columns:auto 1fr auto}.exam-row>span:not(.exam-row-icon){display:none}.notebook-tabs{width:100%}.progress-kpi-grid{grid-template-columns:1fr}.readiness-card{flex-direction:column;grid-column:auto;align-items:flex-start}.global-practice-banner,.recommendation-card{flex-direction:column;align-items:flex-start}.theme-choices{grid-template-columns:1fr}.mobile-bottom-nav{z-index:35;border:1px solid var(--line);background:var(--surface);border-radius:16px;grid-template-columns:repeat(6,1fr);padding:7px;display:grid;position:fixed;bottom:10px;left:10px;right:10px}@supports (color:color-mix(in lab, red, red)){.mobile-bottom-nav{background:color-mix(in srgb, var(--surface) 92%, transparent)}}.mobile-bottom-nav{box-shadow:var(--shadow-md);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px)}.mobile-bottom-nav a{min-height:48px;color:var(--ink-faint);border-radius:11px;flex-direction:column;justify-content:center;align-items:center;gap:4px;font-size:7px;display:flex}.mobile-bottom-nav a.active{color:var(--violet-600);background:var(--violet-50)}.theme-dark .mobile-bottom-nav a.active{background:#7c3aed24}.toast{justify-content:center;bottom:80px;left:15px;right:15px}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}.limit-course-page,.limit-method-page,.reasoning-page{min-width:0}.limit-page-heading,.reasoning-heading{justify-content:space-between;align-items:flex-end;gap:28px;margin-bottom:25px;display:flex}.limit-page-heading h1,.reasoning-heading h1{letter-spacing:-.052em;max-width:780px;margin-bottom:8px;font-size:clamp(30px,4vw,43px);line-height:1.06}.limit-page-heading p,.reasoning-heading p{max-width:720px;color:var(--ink-soft);margin-bottom:0;font-size:13px;line-height:1.65}.beginner-badge{min-height:38px;color:var(--violet-700);background:var(--violet-50);border:1px solid #7c3aed33;border-radius:999px;flex:none;align-items:center;gap:7px;padding:0 12px;font-size:9px;font-weight:800;display:inline-flex}.theme-dark .beginner-badge{color:var(--violet-400);background:#7c3aed1f}.chapter-part-rail{border:1px solid var(--line);background:var(--surface);box-shadow:var(--shadow-sm);scrollbar-width:thin;border-radius:15px;grid-template-columns:repeat(8,minmax(115px,1fr));gap:7px;margin-bottom:18px;padding:8px;display:grid;overflow-x:auto}.chapter-part-rail>div{min-height:62px;color:var(--ink-faint);background:var(--surface-soft);border:1px solid #0000;border-radius:11px;align-items:center;gap:8px;padding:10px;display:flex}.chapter-part-rail>div.current{color:var(--violet-700);background:var(--violet-50);border-color:#7c3aed38}.theme-dark .chapter-part-rail>div.current{color:var(--violet-400);background:#7c3aed1f}.chapter-part-rail>div>span{width:25px;height:25px;color:var(--ink-faint);background:var(--surface);border-radius:8px;flex:none;place-items:center;font-size:8px;font-weight:850;display:grid}.chapter-part-rail>div.current>span{color:#fff;background:var(--violet-600)}.chapter-part-rail small{font-size:8px;font-weight:700;line-height:1.35}.concept-deck-layout{grid-template-columns:minmax(0,1fr) 275px;gap:16px;display:grid}.concept-deck,.lesson-outline-card,.source-note-card,.pdf-grounding-note,.method-decision-card,.method-tool-card,.method-sequence,.exercise-statement-card,.reasoning-canvas-card,.piece-palette,.exercise-next-card,.beginner-empty-card{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow-sm)}.concept-deck{overflow:hidden}.concept-deck-tabs{border-bottom:1px solid var(--line);background:var(--surface-soft);grid-template-columns:repeat(4,1fr);gap:1px;padding:8px;display:grid}.concept-deck-tabs button{min-height:48px;color:var(--ink-faint);background:0 0;border:1px solid #0000;border-radius:10px;justify-content:center;align-items:center;gap:7px;padding:0 10px;font-size:9px;font-weight:750;display:flex}.concept-deck-tabs button:hover,.concept-deck-tabs button.seen{color:var(--violet-600)}.concept-deck-tabs button.active{color:var(--violet-700);background:var(--surface);border-color:#7c3aed30;box-shadow:0 5px 16px #452b740f}.theme-dark .concept-deck-tabs button.active{color:var(--violet-400)}.concept-deck-tabs button>span{width:22px;height:22px;color:var(--ink-faint);background:var(--line);border-radius:7px;place-items:center;font-size:8px;display:grid}.concept-deck-tabs button.active>span{color:#fff;background:var(--violet-600)}.concept-deck-tabs button.seen>span{color:var(--green-600);background:var(--green-100)}.concept-card-body{background:radial-gradient(circle at 95% 4%, #8b5cf614, transparent 24%), var(--surface);min-height:565px;padding:42px;position:relative}.concept-card-body>h2{letter-spacing:-.045em;max-width:700px;margin-bottom:14px;font-size:clamp(25px,3vw,34px);line-height:1.12}.concept-card-body>p{max-width:740px;color:var(--ink-soft);font-size:14px;line-height:1.75}.concept-card-icon{width:49px;height:49px;color:var(--violet-600);background:var(--violet-100);border-radius:15px;place-items:center;display:grid;position:absolute;top:35px;right:38px}.rtl .concept-card-icon{left:38px;right:auto}.concept-card-icon.tone-teal{color:var(--teal-600);background:var(--teal-100)}.concept-card-icon.tone-coral{color:var(--coral-600);background:var(--coral-100)}.limit-intuition{background:var(--surface-violet);border:1px dashed #7c3aed47;border-radius:17px;grid-template-columns:1fr auto 1fr;align-items:center;gap:16px;max-width:720px;margin:32px 0;padding:24px;display:grid}.limit-intuition>div{grid-template-columns:repeat(4,1fr);gap:7px;display:grid}.limit-intuition span{color:var(--ink-faint);grid-column:1/-1;font-size:9px;font-weight:800}.limit-intuition b,.limit-intuition em{border:1px solid var(--line);background:var(--surface);border-radius:9px;place-items:center;min-height:38px;font-family:Georgia,serif;font-size:12px;font-style:normal;display:grid}.limit-intuition em{color:#fff;border-color:var(--violet-600);background:var(--violet-600);font-weight:800}.concept-card-body .lesson-callout{max-width:720px}.success-callout{color:var(--green-600);background:var(--green-100)}.limit-notation{border:1px solid var(--line);background:var(--surface-violet);border-radius:17px;justify-content:center;align-items:center;gap:16px;min-height:155px;margin:26px 0 18px;font-family:Georgia,serif;font-size:33px;display:flex}.notation-limit{font-size:38px}.notation-under{color:var(--violet-600);align-self:flex-end;margin:0 0 38px -54px;font-family:Inter,Segoe UI,sans-serif;font-size:11px;font-weight:800}.notation-function{color:var(--violet-700);background:var(--violet-100);border-radius:11px;padding:9px 12px}.notation-result{color:var(--teal-600);background:var(--teal-100);border-radius:11px;padding:9px 15px}.notation-explainer{grid-template-columns:repeat(3,1fr);gap:9px;display:grid}.notation-explainer>div{border:1px solid var(--line);background:var(--surface-soft);border-radius:12px;flex-direction:column;gap:5px;min-height:76px;padding:14px;display:flex}.notation-explainer strong{color:var(--violet-600);font-family:Georgia,serif;font-size:15px}.notation-explainer span{color:var(--ink-soft);font-size:9px}.one-sided-note{grid-template-columns:1fr 1fr;gap:9px;margin-top:18px;display:grid}.one-sided-note>div{border:1px solid var(--line);border-radius:11px;justify-content:space-between;align-items:center;gap:10px;min-height:58px;padding:13px;display:flex}.one-sided-note>div strong{color:var(--violet-600);font-family:Georgia,serif}.one-sided-note>div span{color:var(--ink-faint);font-size:9px}.one-sided-note>p{color:var(--ink-soft);background:var(--surface-soft);border-radius:11px;grid-column:1/-1;margin:2px 0 0;padding:12px 14px;font-size:10px;line-height:1.55}.graph-card-body{padding-bottom:30px}.interactive-limit-graph{border:1px solid var(--line);background:var(--surface-soft);border-radius:16px;margin-top:22px;padding:18px}.graph-copy{justify-content:space-between;align-items:center;gap:15px;margin-bottom:10px;display:flex}.graph-copy>div:first-child{flex-direction:column;gap:3px;display:flex}.graph-copy span{color:var(--ink-faint);text-transform:uppercase;font-size:8px;font-weight:750}.graph-copy strong{font-size:12px}.graph-side-buttons{gap:6px;display:flex}.graph-side-buttons button{border:1px solid var(--line);min-height:33px;color:var(--violet-600);background:var(--surface);border-radius:9px;padding:0 10px;font-size:8px;font-weight:750}.interactive-limit-graph canvas{border:1px solid var(--line);background:var(--surface);border-radius:12px;width:100%;height:318px;display:block}.interactive-limit-graph input[type=range]{width:100%;accent-color:var(--violet-600);margin:17px 0 9px}.graph-observation{color:var(--teal-600);background:var(--teal-100);border-radius:11px;align-items:flex-start;gap:9px;padding:12px 13px;display:flex}.graph-observation p{color:#0f766e;margin:0;font-size:9px;line-height:1.55}.continuity-equation{border:1px solid var(--line);background:var(--surface-violet);border-radius:17px;justify-content:center;align-items:center;gap:14px;margin:29px 0;padding:29px 18px;font-family:Georgia,serif;font-size:20px;display:flex}.continuity-equation span{color:var(--violet-700);background:var(--surface);border:1px solid #7c3aed24;border-radius:10px;padding:11px 13px}.continuity-equation b{color:var(--teal-600)}.continuity-checklist{grid-template-columns:repeat(3,1fr);gap:9px;display:grid}.continuity-checklist>div{border:1px solid var(--line);background:var(--surface-soft);border-radius:12px;align-items:center;gap:9px;padding:14px;display:flex}.continuity-checklist span{width:28px;height:28px;color:var(--violet-600);background:var(--violet-100);border-radius:8px;flex:none;place-items:center;font-size:9px;font-weight:850;display:grid}.continuity-checklist p{margin:0;font-size:9px;line-height:1.4}.concept-deck-footer{border-top:1px solid var(--line);background:var(--surface-soft);justify-content:space-between;align-items:center;gap:10px;padding:17px 22px;display:flex}.concept-deck-footer button:disabled{cursor:not-allowed;opacity:.4;transform:none}.concept-side-stack{align-content:start;gap:11px;display:grid}.lesson-outline-card{padding:19px}.lesson-outline-card .card-header{font-size:10px}.lesson-outline-card .card-header>span{color:var(--violet-600);font-weight:850}.lesson-outline-card .chapter-progress{margin:13px 0 17px}.lesson-outline-card ul{gap:7px;margin:0;padding:0;list-style:none;display:grid}.lesson-outline-card li{min-height:34px;color:var(--ink-faint);align-items:center;gap:8px;font-size:9px;display:flex}.lesson-outline-card li>span{background:var(--surface-soft);border-radius:7px;flex:none;place-items:center;width:23px;height:23px;font-size:8px;display:grid}.lesson-outline-card li.active{color:var(--violet-600);font-weight:800}.lesson-outline-card li.active>span{color:#fff;background:var(--violet-600)}.lesson-outline-card li.done>span{color:var(--green-600);background:var(--green-100)}.source-note-card{width:100%;min-height:72px;color:var(--violet-600);text-align:start;align-items:center;gap:11px;padding:15px;display:flex}.source-note-card:hover{border-color:var(--violet-400)}.source-note-card div{flex-direction:column;gap:3px;display:flex}.source-note-card strong{font-size:10px}.source-note-card span{color:var(--ink-faint);font-size:8px}.pdf-grounding-note{color:var(--teal-600);background:var(--teal-100);align-items:flex-start;gap:9px;padding:14px;display:flex}@supports (color:color-mix(in lab, red, red)){.pdf-grounding-note{background:color-mix(in srgb, var(--teal-100) 62%, var(--surface))}}.pdf-grounding-note p{color:var(--ink-soft);margin:0;font-size:8px;line-height:1.55}.method-decision-card{background:radial-gradient(circle at 95% 5%, #8b5cf617, transparent 27%), var(--surface);margin-bottom:16px;padding:27px}.method-decision-head{align-items:center;gap:12px;display:flex}.method-decision-head>span{color:#fff;background:var(--violet-600);border-radius:12px;place-items:center;width:40px;height:40px;font-size:10px;font-weight:850;display:grid}.method-decision-head small{color:var(--ink-faint);text-transform:uppercase;font-size:8px;font-weight:800}.method-decision-head h2{margin:3px 0 0;font-size:20px}.method-shape-grid{grid-template-columns:repeat(4,1fr);gap:9px;margin:24px 0 15px;display:grid}.method-shape-grid button{border:1px solid var(--line);background:var(--surface-soft);border-radius:13px;flex-direction:column;justify-content:center;align-items:center;gap:7px;min-height:96px;display:flex}.method-shape-grid button:hover,.method-shape-grid button.active{color:var(--violet-600);border-color:var(--violet-400);background:var(--violet-50)}.theme-dark .method-shape-grid button.active{background:#7c3aed1f}.method-shape-grid button>span{font-family:Georgia,serif;font-size:19px;font-weight:800}.method-shape-grid button small{color:var(--ink-faint);font-size:8px}.method-recommendation{color:var(--violet-600);background:var(--violet-50);border-radius:12px;align-items:flex-start;gap:11px;padding:15px;display:flex}.theme-dark .method-recommendation{background:#7c3aed1f}.method-recommendation strong{font-size:11px}.method-recommendation p{color:var(--ink-soft);margin:4px 0 0;font-size:9px}.method-card-grid{grid-template-columns:repeat(4,1fr);gap:12px;display:grid}.method-tool-card{border-top:4px solid var(--violet-500);min-height:225px;padding:21px}.method-tool-card.tone-teal{border-top-color:var(--teal-500)}.method-tool-card.tone-coral{border-top-color:var(--coral-500)}.method-tool-card.tone-amber{border-top-color:var(--amber-500)}.method-tool-card>span{color:var(--ink-faint);font-size:9px;font-weight:850}.method-tool-card h2{margin:25px 0 9px;font-size:16px;line-height:1.25}.method-tool-card p{min-height:56px;color:var(--ink-soft);font-size:9px;line-height:1.55}.method-tool-card code{color:var(--violet-700);background:var(--surface-soft);white-space:normal;border-radius:9px;padding:10px;font-family:Georgia,serif;font-size:10px;display:block}.method-sequence{grid-template-columns:repeat(7,auto);justify-content:space-between;align-items:center;gap:10px;margin-top:16px;padding:21px;display:grid}.method-sequence>div{grid-template-columns:auto 1fr;align-items:center;gap:3px 9px;display:grid}.method-sequence>div>span{color:#fff;background:var(--violet-600);border-radius:9px;grid-row:1/3;place-items:center;width:30px;height:30px;font-size:9px;font-weight:850;display:grid}.method-sequence strong{font-size:10px}.method-sequence small{color:var(--ink-faint);font-size:8px}.method-sequence>svg{color:var(--violet-400)}.rtl .method-sequence>svg{transform:rotate(180deg)}.method-page-actions{justify-content:space-between;gap:10px;margin-top:18px;display:flex}.reasoning-method-rail{border:1px solid var(--line);background:var(--surface);border-radius:14px;grid-template-columns:repeat(4,1fr);gap:1px;margin-bottom:14px;padding:7px;display:grid}.reasoning-method-rail>div{min-height:47px;color:var(--ink-faint);justify-content:center;align-items:center;gap:8px;font-size:9px;display:flex}.reasoning-method-rail>div>span{background:var(--surface-soft);border-radius:8px;place-items:center;width:24px;height:24px;font-size:8px;display:grid}.reasoning-method-rail>div.active{color:var(--violet-600);background:var(--violet-50);border-radius:10px}.theme-dark .reasoning-method-rail>div.active{background:#7c3aed1f}.reasoning-method-rail>div.active>span{color:#fff;background:var(--violet-600)}.reasoning-method-rail>div.done{color:var(--green-600)}.reasoning-method-rail>div.done>span{color:var(--green-600);background:var(--green-100)}.exercise-statement-card{background:radial-gradient(circle at 96% 10%, #14b8a614, transparent 26%), var(--surface);margin-bottom:14px;padding:25px 28px}.exercise-statement-top{justify-content:space-between;align-items:flex-start;display:flex}.exercise-statement-top>span:last-child{color:var(--green-600);background:var(--green-100);border-radius:999px;padding:5px 8px;font-size:8px;font-weight:800}.exercise-statement-card>p{margin:2px 0 20px;font-size:15px;font-weight:700}.exercise-piecewise-formula{border:1px solid var(--line);background:var(--surface-soft);border-radius:14px;align-items:center;gap:14px;max-width:660px;padding:18px 20px;font-family:Georgia,serif;font-size:18px;display:flex}.exercise-piecewise-formula>div{border-left:2px solid var(--violet-500);grid-template-columns:auto auto;gap:8px 13px;padding-left:18px;display:grid}.exercise-piecewise-formula strong{font-size:16px}.exercise-piecewise-formula small{color:var(--ink-faint);align-self:center;font-family:Inter,Segoe UI,sans-serif;font-size:8px}.reasoning-workspace-grid{grid-template-columns:minmax(0,1fr) 295px;align-items:start;gap:14px;display:grid}.reasoning-canvas-card{min-width:0;padding:25px}.reasoning-canvas-head{justify-content:space-between;align-items:flex-start;gap:15px;margin-bottom:18px;display:flex}.reasoning-canvas-head h2{margin:4px 0 0;font-size:20px}.reasoning-canvas-head>div:last-child{gap:6px;display:flex}.reasoning-canvas-head>div:last-child button{border:1px solid var(--line);width:35px;height:35px;color:var(--ink-faint);background:var(--surface-soft);border-radius:9px;place-items:center;display:grid}.reasoning-canvas-head button:disabled{cursor:not-allowed;opacity:.35}.reasoning-dropzone{background:linear-gradient(#7c3aed06, #7c3aed06), var(--surface-soft);border:1.5px dashed #d8ccec;border-radius:15px;align-content:center;gap:9px;min-height:245px;padding:14px;display:grid}.reasoning-dropzone.has-pieces{align-content:start}.dropzone-empty{max-width:390px;color:var(--violet-600);text-align:center;flex-direction:column;justify-self:center;align-items:center;display:flex}.dropzone-empty strong{margin-top:11px;font-size:11px}.dropzone-empty p{color:var(--ink-faint);margin:6px 0 0;font-size:9px;line-height:1.55}.reasoning-block{border:1px solid var(--line);background:var(--surface);border-radius:12px;overflow:hidden;box-shadow:0 5px 16px #36215b0d}.reasoning-block-main{grid-template-columns:auto auto minmax(0,1fr) auto;align-items:center;gap:9px;min-height:67px;padding:10px 12px;display:grid}.reasoning-block-main>svg{color:var(--ink-faint)}.reasoning-step-number{width:30px;height:30px;color:var(--violet-600);background:var(--violet-100);border-radius:9px;place-items:center;font-size:8px;font-weight:850;display:grid}.reasoning-formula{flex-direction:column;gap:4px;min-width:0;display:flex}.reasoning-formula>small{color:var(--ink-faint);text-transform:uppercase;font-size:7px;font-weight:800}.reasoning-formula>span{font-family:Georgia,serif;font-size:13px;line-height:1.6}.reasoning-formula input{border:1px solid var(--violet-400);min-height:28px;color:var(--violet-700);background:var(--violet-50);text-align:center;border-radius:7px;margin:0 3px;padding:0 6px;font-family:Inter,Segoe UI,sans-serif;font-size:10px;font-weight:800}.theme-dark .reasoning-formula input{color:var(--violet-400);background:#7c3aed1f}.reasoning-block-main>button{width:31px;height:31px;color:var(--ink-faint);background:var(--surface-soft);border-radius:8px;place-items:center;display:grid}.reasoning-block-detail{border-top:1px solid var(--line);background:var(--surface-soft);align-items:flex-end;gap:10px;padding:12px 14px 14px 84px;display:flex}.rtl .reasoning-block-detail{padding-left:14px;padding-right:84px}.reasoning-block-detail label{flex:1}.reasoning-block-detail label>span{color:var(--ink-faint);margin-bottom:6px;font-size:8px;display:block}.reasoning-block-detail textarea{border:1px solid var(--line);background:var(--surface);resize:vertical;border-radius:9px;width:100%;min-height:58px;padding:9px 10px;font-size:9px}.reasoning-block-detail>button{min-height:34px;color:var(--coral-600);background:var(--coral-100);border-radius:8px;padding:0 10px;font-size:8px;font-weight:750}.scratchpad-field{margin-top:14px;display:block}.scratchpad-field>span{color:var(--ink-soft);margin-bottom:7px;font-size:9px;font-weight:800;display:block}.scratchpad-field textarea{border:1px solid var(--line);background:var(--surface-soft);resize:vertical;border-radius:12px;width:100%;min-height:105px;padding:13px;font-family:Georgia,serif;font-size:14px}.quick-symbols{flex-wrap:wrap;gap:6px;margin-top:8px;display:flex}.quick-symbols button{border:1px solid var(--line);min-width:43px;min-height:33px;color:var(--violet-700);background:var(--surface);border-radius:8px;padding:0 9px;font-family:Georgia,serif;font-size:11px}.quick-symbols button:hover{border-color:var(--violet-400);background:var(--violet-50)}.builder-feedback,.progressive-hint{border-radius:12px;align-items:flex-start;gap:11px;margin-top:14px;padding:14px;display:flex}.builder-feedback.correct{color:var(--green-600);background:var(--green-100);border:1px solid #22c55e33}.builder-feedback.incomplete,.progressive-hint{color:#b45309;background:#fff7ed;border:1px solid #f59e0b33}.theme-dark .builder-feedback.incomplete,.theme-dark .progressive-hint{color:#fbbf24;background:#f59e0b1c}.builder-feedback strong,.progressive-hint strong{font-size:10px}.builder-feedback p,.progressive-hint p{color:var(--ink-soft);margin:4px 0 0;font-size:9px;line-height:1.55}.reasoning-actions{justify-content:space-between;gap:10px;margin-top:18px;display:flex}.piece-palette{padding:18px;position:sticky;top:90px}.piece-palette-head{align-items:center;gap:10px;margin-bottom:18px;display:flex}.palette-icon{width:40px;height:40px;color:var(--violet-600);background:var(--violet-100);border-radius:12px;place-items:center;display:grid}.piece-palette-head div{flex-direction:column;gap:2px;display:flex}.piece-palette-head strong{font-size:11px}.piece-palette-head p{color:var(--ink-faint);margin:0;font-size:8px}.piece-palette section{margin-top:14px}.piece-palette h3{color:var(--ink-faint);letter-spacing:.08em;text-transform:uppercase;margin-bottom:7px;font-size:8px}.piece-palette section>div{gap:7px;display:grid}.puzzle-piece{min-height:55px;color:var(--violet-700);background:var(--violet-50);text-align:start;border:1px solid #7c3aed33;border-radius:11px 15px 15px 11px;flex-direction:column;justify-content:center;gap:3px;padding:9px 19px 9px 13px;transition:transform .18s,border-color .18s;display:flex;position:relative;overflow:visible}.puzzle-piece:after{background:inherit;content:"";border:1px solid #7c3aed33;border-left:0;border-radius:0 50% 50% 0;width:14px;height:14px;position:absolute;top:50%;right:-7px;transform:translateY(-50%)}.rtl .puzzle-piece{border-radius:15px 11px 11px 15px;padding-left:19px;padding-right:13px}.rtl .puzzle-piece:after{border-left:1px solid #7c3aed33;border-right:0;border-radius:50% 0 0 50%;left:-7px;right:auto}.puzzle-piece:hover{border-color:var(--violet-500);transform:translate(-3px)}.rtl .puzzle-piece:hover{transform:translate(3px)}.puzzle-piece>span{font-family:Georgia,serif;font-size:11px;font-weight:800}.puzzle-piece small{color:var(--ink-faint);font-family:Inter,Segoe UI,sans-serif;font-size:7px}.puzzle-piece.piece-transformer{color:var(--teal-600);background:var(--teal-100);border-color:#14b8a63b}.puzzle-piece.piece-calculer{color:#b45309;background:#fff7ed;border-color:#f59e0b3b}.puzzle-piece.piece-conclure{color:var(--green-600);background:var(--green-100);border-color:#22c55e3b}.palette-tip{color:var(--violet-600);background:var(--surface-soft);border-radius:10px;align-items:flex-start;gap:8px;margin-top:17px;padding:11px;display:flex}.palette-tip p{color:var(--ink-soft);margin:0;font-size:8px;line-height:1.5}.exercise-next-card{justify-content:space-between;align-items:center;gap:18px;margin-top:14px;padding:22px 24px;display:flex}.exercise-next-card h2{margin:4px 0;font-size:16px}.exercise-next-card p{color:var(--ink-faint);margin:0;font-family:Georgia,serif;font-size:11px}.beginner-empty-card{text-align:center;background:radial-gradient(circle at 50% 35%, #8b5cf61c, transparent 30%), var(--surface);flex-direction:column;justify-content:center;align-items:center;min-height:410px;padding:35px;display:flex}.beginner-empty-icon{width:62px;height:62px;color:var(--violet-600);background:var(--violet-100);border-radius:19px;place-items:center;margin-bottom:18px;display:grid}.beginner-empty-card h2{margin:6px 0 8px;font-size:22px}.beginner-empty-card p{max-width:500px;color:var(--ink-soft);margin-bottom:20px;font-size:11px;line-height:1.65}.beginner-chart:after{width:100%;color:var(--ink-faint);content:"Ta première activité apparaîtra ici";text-align:center;align-self:center;font-size:8px}.rtl .beginner-chart:after{content:"سيظهر أول نشاط لك هنا"}@media (width<=1080px){.concept-deck-layout,.reasoning-workspace-grid{grid-template-columns:minmax(0,1fr) 245px}.method-card-grid{grid-template-columns:repeat(2,1fr)}.method-sequence{grid-template-columns:repeat(4,1fr)}.method-sequence>svg{display:none}}@media (width<=900px){.concept-deck-layout,.reasoning-workspace-grid{grid-template-columns:1fr}.concept-side-stack{grid-row:1;grid-template-columns:1fr 1fr}.lesson-outline-card{grid-column:1/-1}.piece-palette{grid-row:1;position:static}.piece-palette>section{vertical-align:top;width:calc(50% - 6px);display:inline-block}.piece-palette>section:nth-of-type(2n){margin-left:8px}.rtl .piece-palette>section:nth-of-type(2n){margin-left:0;margin-right:8px}}@media (width<=680px){.limit-page-heading,.reasoning-heading{flex-direction:column;align-items:flex-start}.limit-page-heading h1,.reasoning-heading h1{font-size:32px}.chapter-part-rail{grid-template-columns:repeat(8,138px)}.concept-deck-tabs{grid-template-columns:repeat(4,120px);overflow-x:auto}.concept-card-body{min-height:0;padding:27px 20px}.concept-card-icon{margin-bottom:17px;position:static}.limit-intuition,.notation-explainer,.one-sided-note,.continuity-checklist,.method-shape-grid,.method-card-grid{grid-template-columns:1fr}.limit-intuition{justify-items:center}.limit-intuition>svg{transform:rotate(90deg)}.limit-notation{gap:9px;min-height:120px;font-size:22px}.notation-limit{font-size:27px}.notation-under{margin:0 0 29px -40px;font-size:8px}.one-sided-note>p{grid-column:auto}.graph-copy,.exercise-next-card{flex-direction:column;align-items:flex-start}.interactive-limit-graph{padding:10px}.interactive-limit-graph canvas{height:270px}.continuity-equation{flex-wrap:wrap;gap:8px;font-size:15px}.concept-deck-footer,.method-page-actions,.reasoning-actions{flex-direction:column;align-items:stretch}.concept-deck-footer .button,.method-page-actions .button,.reasoning-actions .button{width:100%}.concept-side-stack{grid-template-columns:1fr}.lesson-outline-card{grid-column:auto}.method-shape-grid,.method-sequence,.reasoning-method-rail{grid-template-columns:1fr 1fr}.exercise-piecewise-formula{flex-direction:column;align-items:flex-start;font-size:15px}.reasoning-canvas-card{padding:17px}.reasoning-block-main{grid-template-columns:auto auto minmax(0,1fr)}.reasoning-block-main>svg{display:none}.reasoning-block-main>button{grid-column:3;justify-self:end}.reasoning-formula{grid-column:2/4}.reasoning-block-detail,.rtl .reasoning-block-detail{flex-direction:column;align-items:stretch;padding:12px}.piece-palette>section{width:100%;display:block}.piece-palette>section:nth-of-type(2n),.rtl .piece-palette>section:nth-of-type(2n){margin-left:0;margin-right:0}}.pdf-course-page,.pdf-exercise-bank,.pdf-solver-page{gap:24px;display:grid}.pdf-course-hero,.pdf-bank-hero,.pdf-solver-heading{background:radial-gradient(circle at 88% 10%, #14b8a621, transparent 29%), radial-gradient(circle at 12% 100%, #8b5cf61f, transparent 38%), var(--surface);box-shadow:var(--shadow-sm);border:1px solid #8b5cf62e;border-radius:24px;justify-content:space-between;align-items:flex-end;gap:30px;padding:30px 32px;display:flex;position:relative;overflow:hidden}.pdf-course-hero:after,.pdf-bank-hero:after{content:"";border:1px solid #8b5cf621;border-radius:50%;width:160px;height:160px;position:absolute;top:-74px;right:15%}.pdf-course-hero>div:first-child,.pdf-bank-hero>div:first-child,.pdf-solver-heading>div{z-index:1;max-width:760px;position:relative}.pdf-course-hero h1,.pdf-bank-hero h1,.pdf-solver-heading h1{letter-spacing:-.045em;max-width:820px;margin:9px 0 10px;font-size:clamp(31px,4vw,48px);line-height:1.04}.pdf-course-hero p,.pdf-bank-hero p,.pdf-solver-heading p{max-width:720px;color:var(--ink-soft);margin:0;font-size:15px;line-height:1.72}.pdf-course-hero>.button,.pdf-bank-hero>.button,.pdf-solver-heading>.button{z-index:1;flex:none;position:relative}.pdf-course-meta{flex-wrap:wrap;gap:9px;margin-top:19px;display:flex}.pdf-course-meta span{border:1px solid var(--line);color:var(--ink-soft);background:var(--surface);border-radius:999px;align-items:center;gap:6px;padding:8px 10px;display:inline-flex}@supports (color:color-mix(in lab, red, red)){.pdf-course-meta span{background:color-mix(in srgb, var(--surface) 82%, var(--violet-50))}}.pdf-course-meta span{font-size:12px;font-weight:700}.pdf-course-layout{grid-template-columns:294px minmax(0,1fr);align-items:start;gap:22px;display:grid}.pdf-course-outline{border:1px solid var(--line);background:var(--surface);box-shadow:var(--shadow-sm);border-radius:20px;position:sticky;top:82px;overflow:hidden}.pdf-outline-heading{border-bottom:1px solid var(--line);justify-content:space-between;align-items:flex-end;gap:12px;padding:18px 18px 14px;display:flex}.pdf-outline-heading span{font-size:13px;font-weight:800}.pdf-outline-heading small{color:var(--teal-600);font-size:10px;font-weight:800}.pdf-course-outline nav{gap:5px;padding:9px;display:grid}.pdf-course-outline nav a{border:1px solid #0000;border-radius:13px;grid-template-columns:30px minmax(0,1fr) auto;align-items:center;gap:10px;min-height:61px;padding:9px 8px;transition:border-color .18s,background .18s,transform .18s;display:grid}.pdf-course-outline nav a:hover{border-color:var(--line);background:var(--surface-soft);transform:translate(2px)}.pdf-course-outline nav a.active{background:linear-gradient(135deg,#8b5cf621,#14b8a612);border-color:#8b5cf633}.pdf-course-outline nav a>span{border:1px solid var(--line);width:30px;height:30px;color:var(--ink-soft);background:var(--surface);border-radius:9px;place-items:center;font-size:12px;font-weight:850;display:grid}.pdf-course-outline nav a.active>span{color:#fff;background:var(--violet-600);border-color:#0000}.pdf-course-outline nav strong{text-overflow:ellipsis;margin-bottom:4px;font-size:11px;line-height:1.3;display:block;overflow:hidden}.pdf-course-outline nav small{color:var(--ink-faint);font-size:10px;display:block}.pdf-course-outline nav svg{color:var(--ink-faint)}.pdf-source-note{color:var(--ink-soft);background:var(--surface-soft);border-radius:12px;align-items:flex-start;gap:9px;margin:0 10px 10px;padding:12px;display:flex}.pdf-source-note svg{color:var(--violet-600);flex:none}.pdf-source-note p{margin:0;font-size:10px;line-height:1.55}.pdf-lesson-content{min-width:0}.pdf-section-intro,.pdf-bank-section-heading,.pdf-builder-heading{justify-content:space-between;align-items:flex-end;gap:20px;margin-bottom:14px;display:flex}.pdf-section-intro span,.pdf-bank-section-heading>div>span,.pdf-builder-heading>div>span{color:var(--violet-600);letter-spacing:.08em;text-transform:uppercase;font-size:11px;font-weight:850}.pdf-section-intro h2,.pdf-bank-section-heading h2,.pdf-builder-heading h2{letter-spacing:-.03em;margin:5px 0 0;font-size:22px}.pdf-section-intro>small,.pdf-builder-heading>small{border:1px solid var(--line);color:var(--ink-soft);background:var(--surface);border-radius:999px;padding:7px 10px;font-size:11px;font-weight:750}.pdf-lesson-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;display:grid}.pdf-lesson-card{border:1px solid var(--line);background:var(--surface);border-radius:19px;min-width:0;padding:22px;box-shadow:0 10px 28px #2c1e550b}.pdf-lesson-card.wide{grid-column:1/-1}.pdf-card-topline{justify-content:space-between;align-items:center;gap:16px;margin-bottom:13px;display:flex}.pdf-card-topline>span{color:var(--violet-600);letter-spacing:.07em;text-transform:uppercase;font-size:10px;font-weight:850}.pdf-card-topline>small,.pdf-exercise-source{color:var(--ink-faint);text-align:right;align-items:center;gap:5px;font-size:9px;font-weight:650;display:inline-flex}.pdf-lesson-card>h2{letter-spacing:-.025em;margin-bottom:8px;font-size:19px;line-height:1.2}.pdf-lesson-card>p{color:var(--ink-soft);margin-bottom:14px;font-size:13px;line-height:1.68}.pdf-formula-stack,.pdf-problem-formulas{gap:7px;display:grid}.pdf-formula-stack>div,.pdf-problem-formulas>div{color:var(--ink);white-space:nowrap;background:linear-gradient(135deg,#8b5cf613,#14b8a609);border:1px solid #8b5cf621;border-radius:11px;padding:10px 12px;font-family:Cambria Math,Cambria,Times New Roman,serif;font-size:15px;font-weight:650;line-height:1.45;overflow-x:auto}.pdf-card-list{gap:8px;margin:13px 0 0;padding:0;list-style:none;display:grid}.pdf-card-list li{color:var(--ink-soft);align-items:flex-start;gap:8px;font-size:12px;line-height:1.5;display:flex}.pdf-card-list svg{color:var(--teal-600);flex:none;margin-top:2px}.pdf-warning{color:var(--ink-soft);background:#f59e0b14;border:1px solid #f59e0b3d;border-radius:11px;align-items:flex-start;gap:8px;margin-top:13px;padding:11px 12px;font-size:11px;font-weight:650;line-height:1.5;display:flex}.pdf-warning svg{color:var(--amber-500);flex:none}.pdf-table-wrap{border:1px solid var(--line);border-radius:12px;margin-top:13px;overflow-x:auto}.pdf-table-wrap table{border-collapse:collapse;width:100%;font-size:12px}.pdf-table-wrap th,.pdf-table-wrap td{border-bottom:1px solid var(--line);text-align:left;padding:10px 12px}.pdf-table-wrap th{color:var(--ink-soft);background:var(--surface-soft);text-transform:uppercase;font-size:10px}.pdf-table-wrap tr:last-child td{border-bottom:0}.pdf-interactive{border:1px solid var(--line);background:var(--surface-soft);border-radius:15px;gap:10px;margin-top:16px;padding:13px;display:grid}.pdf-interactive-head{justify-content:space-between;align-items:center;gap:15px;display:flex}.pdf-interactive-head>div:first-child{gap:3px;display:grid}.pdf-interactive-head span{color:var(--ink-faint);text-transform:uppercase;font-size:10px;font-weight:750}.pdf-interactive-head strong{font-family:Cambria Math,Cambria,serif;font-size:14px}.pdf-interactive-head>div:last-child{gap:6px;display:flex}.pdf-interactive-head button{border:1px solid var(--line);color:var(--violet-600);background:var(--surface);border-radius:8px;padding:7px 9px;font-size:10px;font-weight:750}.pdf-interactive canvas{border:1px solid var(--line);background:var(--surface);border-radius:11px;width:100%;height:300px;display:block}.pdf-interactive input[type=range]{width:100%;accent-color:var(--violet-600)}.pdf-observation{color:var(--ink-soft);align-items:flex-start;gap:8px;margin:0;font-weight:650;display:flex;font-size:11px!important;line-height:1.55!important}.pdf-observation svg{color:var(--teal-600);flex:none}.pdf-part-navigation{grid-template-columns:1fr 1fr;gap:12px;margin-top:18px;display:grid}.pdf-part-navigation .button{min-height:59px}.pdf-part-navigation .button:first-of-type{justify-self:start}.pdf-part-navigation .button:last-of-type{justify-self:end}.pdf-part-navigation .button span{text-align:left;gap:4px;display:grid}.pdf-part-navigation .button small{opacity:.72;text-transform:uppercase;font-size:9px}.pdf-bank-counts{z-index:1;grid-template-columns:1fr 1fr;gap:9px;min-width:270px;display:grid;position:relative}.pdf-bank-counts span{border:1px solid var(--line);background:var(--surface);border-radius:17px;align-content:center;gap:4px;min-height:105px;padding:17px;display:grid}@supports (color:color-mix(in lab, red, red)){.pdf-bank-counts span{background:color-mix(in srgb, var(--surface) 88%, var(--violet-50))}}.pdf-bank-counts span{color:var(--ink-soft);text-align:center;font-size:10px;font-weight:700}.pdf-bank-counts strong{color:var(--violet-600);font-size:29px}.pdf-bank-section,.pdf-supplement-section{border:1px solid var(--line);background:var(--surface);box-shadow:var(--shadow-sm);border-radius:22px;padding:23px}.pdf-exercise-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;display:grid}.pdf-exercise-card{border:1px solid var(--line);background:linear-gradient(145deg, #8b5cf60a, transparent 42%), var(--surface);border-radius:16px;flex-direction:column;min-width:0;min-height:298px;padding:18px;transition:border-color .18s,transform .18s,box-shadow .18s;display:flex}.pdf-exercise-card:hover{border-color:#8b5cf659;transform:translateY(-3px);box-shadow:0 14px 32px #2c1e5514}.pdf-exercise-card-head{justify-content:space-between;align-items:center;gap:8px;margin-bottom:15px;display:flex}.pdf-exercise-card-head>span{color:var(--violet-600);text-transform:uppercase;font-size:10px;font-weight:850}.pdf-exercise-card-head small{color:var(--teal-600);background:var(--teal-100);border-radius:999px;padding:5px 7px;font-size:8px;font-weight:850}.theme-dark .pdf-exercise-card-head small{background:#14b8a61f}.pdf-exercise-card h3{letter-spacing:-.02em;margin-bottom:8px;font-size:17px}.pdf-exercise-card>p{color:var(--ink-soft);-webkit-line-clamp:4;-webkit-box-orient:vertical;margin-bottom:13px;font-size:11px;line-height:1.6;display:-webkit-box;overflow:hidden}.pdf-exercise-method{color:var(--ink-soft);align-items:center;gap:6px;margin-bottom:9px;font-size:10px;font-weight:750;display:flex}.pdf-exercise-method svg{color:var(--coral-500)}.pdf-exercise-card>a{border-top:1px solid var(--line);color:var(--violet-600);justify-content:space-between;align-items:center;gap:10px;margin-top:auto;padding-top:13px;font-size:11px;font-weight:850;display:flex}.pdf-supplement-section{background:radial-gradient(circle at 100% 0, #14b8a612, transparent 27%), var(--surface)}.pdf-supplement-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;display:grid}.pdf-supplement-grid article{border:1px solid var(--line);background:var(--surface-soft);border-radius:14px;padding:17px}.pdf-supplement-grid span{color:var(--teal-600);letter-spacing:.08em;text-transform:uppercase;font-size:9px;font-weight:850}.pdf-supplement-grid h3{margin:6px 0 7px;font-size:14px}.pdf-supplement-grid p{color:var(--ink-soft);margin:0;font-size:10px;line-height:1.55}.pdf-solver-heading{align-items:center;padding:24px 27px}.pdf-solver-heading h1{font-size:clamp(28px,3vw,39px)}.pdf-solver-layout{grid-template-columns:minmax(0,1fr) 292px;align-items:start;gap:18px;display:grid}.pdf-solver-main{gap:14px;min-width:0;display:grid}.pdf-problem-card,.pdf-reasoning-builder,.pdf-correction-card,.pdf-method-card,.pdf-workspace-tip{border:1px solid var(--line);background:var(--surface);box-shadow:var(--shadow-sm);border-radius:19px}.pdf-problem-card{background:radial-gradient(circle at 92% 0, #8b5cf61c, transparent 31%), var(--surface);padding:22px}.pdf-problem-topline{justify-content:space-between;align-items:center;gap:14px;margin-bottom:19px;display:flex}.pdf-problem-topline span{color:var(--ink-faint);align-items:center;gap:6px;font-size:10px;font-weight:700;display:inline-flex}.pdf-problem-topline small{color:var(--violet-600);background:var(--violet-100);border-radius:999px;padding:6px 9px;font-size:9px;font-weight:850}.theme-dark .pdf-problem-topline small{background:#8b5cf624}.pdf-problem-label{color:var(--coral-500);letter-spacing:.08em;text-transform:uppercase;font-size:10px;font-weight:850}.pdf-problem-card h2{max-width:820px;margin:7px 0 17px;font-size:18px;line-height:1.5}.pdf-reasoning-builder{padding:22px}.pdf-builder-heading>div>span{align-items:center;gap:6px;display:inline-flex}.reasoning-piece-palette{border:1px solid var(--line);background:var(--surface-soft);border-radius:13px;flex-wrap:wrap;gap:8px;padding:14px;display:flex}.reasoning-piece-palette button{min-height:36px;color:var(--violet-700);background:var(--surface);border:1px solid #8b5cf638;border-radius:9px 12px 12px 9px;align-items:center;gap:6px;padding:7px 10px;font-family:Cambria Math,Cambria,serif;font-size:12px;font-weight:700;transition:color .18s,background .18s,transform .18s;display:inline-flex}.reasoning-piece-palette button:hover{color:#fff;background:var(--violet-600);transform:translateY(-2px)}.theme-dark .reasoning-piece-palette button{color:var(--violet-400)}.reasoning-custom-piece{gap:7px;margin-top:13px;display:grid}.reasoning-custom-piece label,.pdf-scratchpad>span{color:var(--ink-soft);font-size:10px;font-weight:800}.reasoning-custom-piece>div{grid-template-columns:minmax(0,1fr) auto;gap:8px;display:grid}.reasoning-custom-piece input{border:1px solid var(--line);background:var(--surface);border-radius:10px;outline:0;min-width:0;min-height:42px;padding:0 12px}.reasoning-custom-piece input:focus{border-color:var(--violet-500);box-shadow:0 0 0 3px #8b5cf61a}.reasoning-custom-piece button{color:#fff;background:var(--violet-600);border-radius:10px;align-items:center;gap:6px;padding:0 13px;font-size:11px;font-weight:800;display:inline-flex}.reasoning-sequence{border:1px dashed var(--line-strong);background:linear-gradient(90deg, transparent 98%, #8b5cf60a 98%), var(--surface);background-size:28px 100%;border-radius:14px;flex-wrap:wrap;align-content:flex-start;gap:8px;min-height:104px;margin-top:13px;padding:14px;display:flex}.reasoning-piece-selected{min-height:39px;color:var(--ink);background:var(--surface);border:1px solid #14b8a645;border-radius:10px;grid-template-columns:22px auto 14px;align-items:center;gap:7px;padding:6px 9px 6px 6px;display:inline-grid}@supports (color:color-mix(in lab, red, red)){.reasoning-piece-selected{background:color-mix(in srgb, var(--surface) 88%, var(--teal-100))}}.reasoning-piece-selected>span{color:#fff;background:var(--teal-600);border-radius:7px;place-items:center;width:22px;height:22px;font-family:Inter,sans-serif;font-size:9px;font-weight:850;display:grid}.reasoning-piece-selected strong{font-size:12px}.reasoning-piece-selected svg{color:var(--ink-faint)}.reasoning-empty{width:100%;color:var(--ink-faint);text-align:center;justify-content:center;align-items:center;gap:9px;display:flex}.reasoning-empty p{margin:0;font-size:11px}.pdf-scratchpad{gap:7px;margin-top:14px;display:grid}.pdf-scratchpad textarea{resize:vertical;border:1px solid var(--line);background:repeating-linear-gradient(to bottom, var(--surface) 0, var(--surface) 31px, var(--line) 32px);border-radius:13px;outline:0;width:100%;min-height:165px;padding:15px;font-family:Cambria Math,Cambria,serif;font-size:15px;line-height:32px}.pdf-scratchpad textarea:focus{border-color:var(--violet-500);box-shadow:0 0 0 3px #8b5cf61a}.pdf-correction-card{overflow:hidden}.pdf-correction-card>button{background:var(--surface);justify-content:space-between;align-items:center;gap:15px;width:100%;padding:17px 20px;display:flex}.pdf-correction-card>button>span{text-align:left;align-items:center;gap:11px;display:flex}.pdf-correction-card>button>span>svg{color:var(--violet-600)}.pdf-correction-card>button strong,.pdf-correction-card>button small{display:block}.pdf-correction-card>button strong{margin-bottom:3px;font-size:13px}.pdf-correction-card>button small{color:var(--ink-faint);font-size:10px}.pdf-correction-content{border-top:1px solid var(--line);padding:0 20px 20px}.pdf-correction-content ol{gap:8px;margin:16px 0;padding-left:22px;display:grid}.pdf-correction-content li{color:var(--ink-soft);padding-left:4px;font-size:12px;line-height:1.55}.pdf-correction-content>div{color:var(--teal-600);background:#14b8a617;border-radius:11px;align-items:flex-start;gap:9px;padding:12px;display:flex}.pdf-correction-content>div p{margin:0;font-family:Cambria Math,Cambria,serif;font-size:14px;font-weight:700}.pdf-solver-side{gap:12px;display:grid;position:sticky;top:82px}.pdf-method-card{padding:18px}.pdf-method-card>span{color:var(--violet-600);letter-spacing:.07em;text-transform:uppercase;align-items:center;gap:7px;font-size:9px;font-weight:850;display:flex}.pdf-method-card>h2{margin:8px 0 15px;font-size:18px}.pdf-method-card ol{gap:9px;margin:0;padding:0;list-style:none;display:grid}.pdf-method-card li{grid-template-columns:25px minmax(0,1fr);align-items:start;gap:8px;display:grid}.pdf-method-card li>span{width:25px;height:25px;color:var(--violet-600);background:var(--violet-100);border-radius:8px;place-items:center;font-size:9px;font-weight:850;display:grid}.theme-dark .pdf-method-card li>span{background:#8b5cf624}.pdf-method-card li p{color:var(--ink-soft);margin:3px 0 0;font-size:10px;line-height:1.5}.pdf-method-card>button{border:1px solid var(--line);width:100%;min-height:39px;color:var(--violet-600);background:var(--surface-soft);border-radius:10px;justify-content:center;align-items:center;gap:7px;margin-top:15px;font-size:10px;font-weight:850;display:flex}.pdf-method-card>button:disabled{color:var(--ink-faint);cursor:default}.pdf-workspace-tip{background:linear-gradient(135deg,#14b8a617,#8b5cf60d);align-items:flex-start;gap:10px;padding:15px;display:flex}.pdf-workspace-tip>svg{color:var(--teal-600);flex:none}.pdf-workspace-tip strong{margin-bottom:5px;font-size:11px;display:block}.pdf-workspace-tip p{color:var(--ink-soft);margin:0;font-size:9px;line-height:1.55}.pdf-exercise-navigation{justify-content:space-between;gap:12px;display:flex}.rtl .pdf-course-outline nav a:hover{transform:translate(-2px)}.rtl .pdf-course-outline nav svg,.rtl .pdf-exercise-card>a svg,.rtl .pdf-correction-card>button>svg{transform:rotate(180deg)}@media (width<=1180px){.pdf-course-layout{grid-template-columns:250px minmax(0,1fr)}.pdf-exercise-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (width<=980px){.pdf-course-layout,.pdf-solver-layout{grid-template-columns:1fr}.pdf-course-outline,.pdf-solver-side{position:static}.pdf-course-outline nav{grid-template-columns:repeat(8,220px);overflow-x:auto}.pdf-source-note{display:none}.pdf-solver-side{grid-row:1;grid-template-columns:1fr 1fr}}@media (width<=760px){.pdf-course-hero,.pdf-bank-hero,.pdf-solver-heading{flex-direction:column;align-items:flex-start;padding:23px 20px}.pdf-course-hero>.button,.pdf-solver-heading>.button{width:100%}.pdf-lesson-grid,.pdf-part-navigation,.pdf-exercise-grid,.pdf-supplement-grid{grid-template-columns:1fr}.pdf-lesson-card.wide{grid-column:auto}.pdf-card-topline,.pdf-problem-topline{flex-direction:column;align-items:flex-start}.pdf-card-topline>small{text-align:left}.pdf-part-navigation .button{width:100%;justify-self:stretch!important}.pdf-bank-counts{width:100%;min-width:0}.pdf-solver-side{grid-template-columns:1fr}}.course-learning-hero{padding:23px 26px}.course-learning-hero h1{font-size:clamp(28px,3.6vw,41px)}.course-learning-hero p{max-width:66ch;font-size:14px;line-height:1.62}.course-goals{padding:0;display:block}.course-goals>summary{cursor:pointer;justify-content:space-between;align-items:center;gap:14px;min-height:54px;padding:12px 17px;list-style:none;display:flex}.course-goals>summary::-webkit-details-marker{display:none}.course-map>summary::-webkit-details-marker{display:none}.course-storyline>summary::-webkit-details-marker{display:none}.course-goals>summary>span{color:var(--teal-600);align-items:center;gap:8px;font-size:12px;font-weight:850;display:inline-flex}.course-goals>summary small{color:var(--ink-faint);font-size:11px;font-weight:750}.course-goals[open]>summary{border-bottom:1px solid var(--line)}.course-goals ul{padding:15px 17px 17px}.guided-course-layout{grid-template-columns:minmax(0,1fr);gap:13px;display:grid}.course-map{max-height:none;position:static;overflow:visible}.course-map>summary{cursor:pointer;list-style:none}.course-map[open]>summary{border-bottom:1px solid var(--line)}.course-map[open] nav{grid-template-columns:repeat(3,minmax(0,1fr))}.course-map .pdf-source-note{margin-top:2px}.course-storyline{background:linear-gradient(125deg, #14b8a614, transparent 48%), var(--surface);box-shadow:var(--shadow-sm);border:1px solid #14b8a63d;border-radius:18px;margin-bottom:12px;overflow:hidden}.course-storyline>summary{cursor:pointer;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:14px;min-height:72px;padding:14px 17px;list-style:none;display:grid}.course-storyline>summary>span{color:var(--teal-600);letter-spacing:.05em;text-transform:uppercase;align-items:center;gap:7px;font-size:10px;font-weight:900;display:inline-flex}.course-storyline>summary strong{font-size:16px;line-height:1.4}.course-storyline>summary>svg{color:var(--ink-faint);transition:transform .18s}.course-storyline[open]>summary>svg{transform:rotate(90deg)}.course-storyline>div{border-top:1px solid var(--line);gap:14px;padding:0 17px 17px;display:grid}.course-storyline>div>p{max-width:68ch;color:var(--ink-soft);margin:15px 0 0;font-size:15px;line-height:1.65}.course-storyline ol{grid-template-columns:repeat(3,minmax(0,1fr));gap:9px;margin:0;padding:0;list-style:none;display:grid}.course-storyline li{border:1px solid var(--line);color:var(--ink-soft);background:var(--surface);border-radius:12px;grid-template-columns:30px minmax(0,1fr);align-items:center;gap:9px;padding:10px;display:grid}@supports (color:color-mix(in lab, red, red)){.course-storyline li{background:color-mix(in srgb, var(--surface) 88%, var(--teal-100))}}.course-storyline li{font-size:12px;font-weight:750;line-height:1.4}.course-storyline li span{width:30px;height:30px;color:var(--teal-600);background:var(--teal-500);border-radius:9px;place-items:center;display:grid}@supports (color:color-mix(in lab, red, red)){.course-storyline li span{background:color-mix(in srgb, var(--teal-500) 12%, var(--surface))}}.course-storyline li span{font-size:10px;font-weight:900}.course-storyline>div>small{color:var(--ink-soft);align-items:flex-start;gap:7px;font-size:12px;font-weight:750;line-height:1.5;display:flex}.course-storyline>div>small svg{color:var(--violet-600);flex:none}.course-logic-bridge{border-right:1px solid var(--line);border-left:1px solid var(--line);background:var(--surface-soft);grid-template-columns:minmax(0,.8fr) auto minmax(0,1.15fr) auto minmax(0,.8fr);align-items:stretch;gap:7px;padding:10px;display:grid}.course-logic-bridge>div{border-radius:10px;align-content:center;gap:4px;min-width:0;padding:7px 9px;display:grid}.course-logic-bridge>div.current{background:var(--surface);box-shadow:var(--shadow-sm)}.course-logic-bridge small{color:var(--ink-faint);letter-spacing:.04em;text-transform:uppercase;font-size:9px;font-weight:850}.course-logic-bridge span,.course-logic-bridge strong{color:var(--ink-soft);text-overflow:ellipsis;white-space:nowrap;font-size:11px;line-height:1.35;overflow:hidden}.course-logic-bridge strong{color:var(--ink)}.course-logic-bridge>svg{color:var(--ink-faint);align-self:center}.course-concept-card{min-height:0}.course-card-content{padding:clamp(24px,3.5vw,38px)}.course-chapter-label{color:var(--violet-600);letter-spacing:.04em;text-transform:uppercase;margin-bottom:13px;font-size:11px;font-weight:900;display:inline-flex}.course-card-opening{max-width:68ch;margin-bottom:25px}.course-card-opening>h2{margin-bottom:12px;font-size:clamp(25px,3vw,35px);line-height:1.12}.course-card-opening>p:last-child{color:var(--ink-faint);margin:10px 0 0;font-size:12px;font-weight:750}.course-explanation-path{gap:0;max-width:920px;display:grid}.course-explanation-step{grid-template-columns:36px minmax(0,1fr);gap:15px;padding-bottom:28px;display:grid;position:relative}.course-explanation-step:not(:last-child):before{background:var(--stage-color);border-radius:999px;width:2px;position:absolute;top:34px;bottom:0;left:17px}@supports (color:color-mix(in lab, red, red)){.course-explanation-step:not(:last-child):before{background:color-mix(in srgb, var(--stage-color) 22%, var(--line))}}.course-explanation-step:not(:last-child):before{content:""}.course-step-marker{z-index:1;border:1px solid var(--stage-color);place-items:center;width:36px;height:36px;display:grid}@supports (color:color-mix(in lab, red, red)){.course-step-marker{border:1px solid color-mix(in srgb, var(--stage-color) 24%, var(--line))}}.course-step-marker{color:var(--stage-color);background:var(--surface);border-radius:11px;font-size:11px;font-weight:900}.course-explanation-step>div{min-width:0}.course-step-kicker{color:var(--stage-color);letter-spacing:.045em;text-transform:uppercase;margin:2px 0 11px;font-size:11px;font-weight:900;display:block}.course-formulas,.course-step-list,.course-table-wrap,.course-trap{margin-bottom:0}.course-formulas>div{font-size:clamp(15px,2vw,18px)}.course-step-list p,.course-trap p{font-size:14px;line-height:1.58}.course-teach-back{background:var(--teal-100);border:1px solid #14b8a63d;border-radius:14px;max-width:860px;margin-top:4px}@supports (color:color-mix(in lab, red, red)){.course-teach-back{background:color-mix(in srgb, var(--teal-100) 35%, var(--surface))}}.course-teach-back>summary{min-height:52px;color:var(--teal-600);cursor:pointer;align-items:center;gap:8px;padding:10px 14px;font-size:12px;font-weight:850;list-style:none;display:flex}.course-teach-back>summary::-webkit-details-marker{display:none}.course-teach-back>div{padding:0 14px 14px 38px}.course-teach-back strong{text-transform:uppercase;margin-bottom:5px;font-size:11px;display:block}.course-teach-back p{max-width:65ch;color:var(--ink-soft);margin:0;font-size:14px;line-height:1.6}.course-source{opacity:.72}.course-worked-example{background:var(--surface-soft);border:1px solid #f9737540;border-radius:16px;overflow:hidden}.course-worked-heading{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:12px;min-height:48px;padding:10px 13px;display:flex}.course-worked-heading span{color:var(--coral-600);text-transform:uppercase;font-size:11px;font-weight:900}.course-worked-heading small{color:var(--ink-faint);font-size:10px;font-weight:750}.course-worked-example ol{gap:8px;margin:0;padding:13px;list-style:none;display:grid}.course-worked-example li{grid-template-columns:30px minmax(0,1fr);align-items:center;gap:9px;display:grid}.course-worked-example li>span{width:30px;height:30px;color:var(--coral-600);background:var(--coral-500);border-radius:9px;place-items:center;display:grid}@supports (color:color-mix(in lab, red, red)){.course-worked-example li>span{background:color-mix(in srgb, var(--coral-500) 11%, var(--surface))}}.course-worked-example li>span{font-size:10px;font-weight:900}.course-worked-example li>div{color:var(--ink);background:var(--surface);white-space:nowrap;border-radius:10px;padding:11px 12px;font-family:Cambria Math,Cambria,Times New Roman,serif;font-size:17px;font-weight:650;overflow-x:auto}.course-worked-prompt{border-top:1px solid var(--line);gap:8px;padding:14px;display:grid}.course-worked-prompt>span{color:var(--coral-600);text-transform:uppercase;font-size:10px;font-weight:900}.course-worked-prompt p{max-width:60ch;color:var(--ink-soft);margin:0;font-size:14px;line-height:1.55}.course-worked-prompt button{width:fit-content;min-height:44px;color:var(--coral-600);background:var(--surface);border:1px solid #f973754d;border-radius:10px;align-items:center;gap:6px;padding:0 12px;font-size:12px;font-weight:850;display:inline-flex}.course-worked-complete{border-top:1px solid var(--line);color:var(--green-600);align-items:flex-start;gap:7px;margin:0;padding:12px 14px;font-size:12px;font-weight:750;line-height:1.5;display:flex}.course-check-feedback{justify-content:space-between;align-items:flex-start;gap:12px;margin-top:12px;display:flex}.course-check-feedback p{margin:0;font-size:13px;line-height:1.55}.course-check-feedback.correct p{color:var(--green-600)}.course-check-feedback.incorrect p{color:var(--coral-600)}.course-check-feedback button{border:1px solid var(--line);min-height:44px;color:var(--ink-soft);background:var(--surface);border-radius:10px;flex:none;padding:0 12px;font-size:11px;font-weight:800}.learning-approach-table{border-top:1px solid var(--line);grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;padding:12px 14px;display:grid}.learning-approach-table>div{gap:6px;display:grid}.learning-approach-table strong{color:var(--ink-soft);font-size:11px}.learning-approach-table button{border:1px solid var(--line);min-height:42px;color:var(--ink-soft);background:var(--surface-soft);border-radius:9px;justify-content:space-between;align-items:center;gap:8px;padding:7px 9px;font-family:Cambria Math,Cambria,serif;font-size:12px;display:flex}.learning-approach-table button span{color:var(--teal-600)}.learning-prediction{border-top:1px solid var(--line);gap:9px;padding:13px 16px 16px;display:grid}.learning-prediction>span{color:var(--ink);font-size:13px;font-weight:800}.learning-prediction>div{gap:7px;display:flex}.learning-prediction button,.learning-side-choice button{border:1px solid var(--line);min-width:44px;min-height:44px;color:var(--ink-soft);background:var(--surface);border-radius:10px;padding:0 11px;font-size:12px;font-weight:850}.learning-prediction button[aria-pressed=true],.learning-side-choice button.active{color:#fff;border-color:var(--violet-600);background:var(--violet-600)}.learning-prediction p{color:var(--ink-soft);align-items:flex-start;gap:7px;margin:0;font-size:12px;line-height:1.55;display:flex}.continuity-prediction{background:var(--surface-soft);border-radius:11px;justify-content:space-between;align-items:center;gap:12px;margin:0 14px 14px;padding:12px;display:flex}.continuity-prediction>span{max-width:58ch;color:var(--ink-soft);font-size:12px;font-weight:750;line-height:1.5}.continuity-prediction button{min-height:44px;color:var(--violet-600);background:var(--surface);border:1px solid #8b5cf640;border-radius:10px;flex:none;padding:0 12px;font-size:11px;font-weight:850}.learning-side-choice{grid-auto-flow:column;gap:5px!important;display:flex!important}.sign-reasoning-flow{grid-template-columns:minmax(0,1fr) auto minmax(0,1fr) auto minmax(0,1fr) auto minmax(0,1fr);align-items:center;gap:7px;padding:20px 14px;display:grid}.sign-reasoning-flow>div{border:1px solid var(--line);background:var(--surface-soft);text-align:center;border-radius:12px;align-content:center;gap:6px;min-height:76px;padding:10px;display:grid}.sign-reasoning-flow small{color:var(--ink-faint);text-transform:uppercase;font-size:9px;font-weight:800}.sign-reasoning-flow strong{font-family:Cambria Math,Cambria,serif;font-size:13px;line-height:1.4}.sign-reasoning-flow>svg{color:var(--ink-faint)}.learning-interactive-head span,.learning-range span,.learning-range-pair span,.learning-interactive>p,.learning-result{font-size:12px}.course-card-navigation>.primary span{min-width:0}.course-card-navigation>.primary span:not(small){overflow:hidden}.course-card-navigation>.primary{min-width:0}.course-card-navigation>.primary span{line-height:1.3;display:grid}.course-practice-handoff{grid-template-columns:repeat(3,minmax(0,1fr))}.course-practice-handoff>div{background:var(--teal-100);border:1px solid #14b8a638;border-radius:13px;align-content:start;gap:8px;min-height:132px;padding:14px;display:grid}@supports (color:color-mix(in lab, red, red)){.course-practice-handoff>div{background:color-mix(in srgb, var(--teal-100) 32%, var(--surface))}}.course-practice-handoff>div small{color:var(--teal-600);text-transform:uppercase;align-items:center;gap:6px;font-size:9px;font-weight:850;display:flex}.course-practice-handoff>div strong{font-size:12px;line-height:1.4}.course-practice-handoff>div span{color:var(--ink-soft);font-size:10px;line-height:1.5}.one-sided-lab .learning-choice-tabs{grid-template-columns:repeat(2,minmax(0,1fr))}.approach-number-line{grid-template-columns:1fr 1fr;gap:8px;padding:24px 18px 16px;display:grid}.approach-number-line .side-label{color:var(--ink-faint);text-align:center;font-size:10px;font-weight:800}.number-line-track{grid-column:1/-1;grid-template-columns:1fr 36px 1fr;align-items:center;height:54px;display:grid;position:relative}.number-line-track:before{background:var(--line);content:"";height:2px;position:absolute;left:0;right:0}.number-line-track i{z-index:1;border-radius:999px;height:10px}.number-line-track .left-region{background:var(--violet-500)}.number-line-track .right-region{background:var(--teal-500)}.approach-number-line.endpoint .left-region{opacity:.12;background:repeating-linear-gradient(45deg, var(--ink-faint), var(--ink-faint) 3px, transparent 3px, transparent 7px)}.number-line-track strong{z-index:2;border:3px solid var(--surface);color:#fff;background:var(--violet-600);width:36px;height:36px;box-shadow:0 0 0 1px var(--violet-600);border-radius:50%;place-items:center;font-family:Cambria Math,Cambria,serif;display:grid}.approach-number-line>p{color:var(--ink-soft);text-align:center;grid-column:1/-1;margin:0;font-size:12px;line-height:1.55}.side-prediction{border-top:1px solid var(--line);gap:10px;padding:14px 16px 17px;display:grid}.side-prediction>span{color:var(--ink);font-size:13px;font-weight:850}.side-prediction>div{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;display:grid}.side-prediction>div button,.side-check-button{border:1px solid var(--line);min-height:44px;color:var(--ink-soft);background:var(--surface);border-radius:10px;padding:8px 11px;font-size:11px;font-weight:800}.side-prediction>div button[aria-pressed=true]{color:#fff;border-color:var(--violet-600);background:var(--violet-600)}.side-check-button{width:fit-content;color:var(--violet-600);border-color:#8b5cf64d}.side-prediction>p{align-items:flex-start;gap:7px;margin:0;font-size:12px;font-weight:750;line-height:1.55;display:flex}.side-prediction>p.correct{color:var(--green-600)}.side-prediction>p.incorrect{color:var(--coral-600)}.domain-gate-flow{grid-template-columns:minmax(0,1fr) auto minmax(0,1fr) auto minmax(0,1fr);align-items:center;gap:8px;padding:22px 15px;display:grid}.domain-gate-flow>div{border:1px solid var(--line);background:var(--surface-soft);text-align:center;border-radius:12px;align-content:center;gap:7px;min-height:86px;padding:11px;display:grid}.domain-gate-flow small{color:var(--ink-faint);text-transform:uppercase;font-size:9px;font-weight:850}.domain-gate-flow strong{font-family:Cambria Math,Cambria,serif;font-size:14px;line-height:1.45}.domain-gate-flow>svg{color:var(--ink-faint)}@media (width>=981px){.pdf-solver-side{overscroll-behavior:contain;scrollbar-width:thin;max-height:calc(100vh - 96px);padding-right:3px;overflow-y:auto}}@media (width<=980px){.course-map[open] nav{grid-template-columns:repeat(2,minmax(0,1fr))}.course-logic-bridge{grid-template-columns:minmax(0,1fr) auto minmax(0,1.2fr)}.course-logic-bridge>div:nth-of-type(3),.course-logic-bridge>svg:last-of-type{display:none}.sign-reasoning-flow{grid-template-columns:repeat(2,minmax(0,1fr))}.sign-reasoning-flow>svg,.domain-gate-flow>svg{display:none}.domain-gate-flow{grid-template-columns:repeat(3,minmax(0,1fr))}}@media (width<=760px){.course-learning-hero{padding:19px;display:grid}.course-learning-hero>.button{justify-content:center;width:100%}.course-goals ul,.course-storyline ol,.course-map[open] nav,.learning-approach-table,.course-practice-handoff{grid-template-columns:1fr}.course-storyline>summary{grid-template-columns:minmax(0,1fr) auto}.course-storyline>summary>span{grid-column:1/-1}.course-logic-bridge{grid-template-columns:1fr}.course-logic-bridge>div:not(.current),.course-logic-bridge>svg{display:none}.course-card-content{padding:22px 17px 25px}.course-card-rail{width:44px}.course-concept-card{grid-template-columns:44px minmax(0,1fr)}.course-card-opening>h2{font-size:clamp(24px,8vw,31px)}.course-card-body{font-size:16px}.course-explanation-step{grid-template-columns:32px minmax(0,1fr);gap:11px}.course-step-marker{width:32px;height:32px}.course-explanation-step:not(:last-child):before{top:30px;left:15px}.course-quick-check>div{grid-template-columns:1fr}.course-check-feedback{display:grid}.course-worked-heading{flex-direction:column;align-items:flex-start}.learning-interactive canvas{height:250px}.learning-interactive-head{flex-direction:column;align-items:flex-start}.continuity-prediction{flex-direction:column;align-items:stretch}.learning-side-choice{width:100%}.learning-side-choice button{flex:1}.sign-reasoning-flow,.side-prediction>div,.domain-gate-flow{grid-template-columns:1fr}.course-card-navigation{bottom:calc(68px + env(safe-area-inset-bottom))}}@media (width<=520px){.course-card-rail{display:none}.course-concept-card{grid-template-columns:minmax(0,1fr)}.course-card-content{padding-inline:15px}.course-player-toolbar{flex-direction:column;align-items:flex-start}.course-player-toolbar button{justify-content:center;width:100%}.pdf-course-hero h1,.pdf-bank-hero h1,.pdf-solver-heading h1{font-size:29px}.pdf-course-hero,.pdf-bank-hero,.pdf-bank-section,.pdf-supplement-section,.pdf-solver-heading,.pdf-lesson-card,.pdf-problem-card,.pdf-reasoning-builder{border-radius:17px;padding:17px}.pdf-course-meta,.pdf-section-intro,.pdf-bank-section-heading,.pdf-builder-heading{flex-direction:column;align-items:flex-start}.pdf-bank-section-heading>.button{width:100%}.pdf-interactive-head{flex-direction:column;align-items:flex-start}.pdf-interactive canvas{height:245px}.reasoning-custom-piece>div{grid-template-columns:1fr}.reasoning-custom-piece button{justify-content:center;min-height:40px}.pdf-exercise-navigation{flex-direction:column}.pdf-exercise-navigation .button{width:100%}}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.pdf-course-hero.compact{align-items:center;padding-block:24px}.course-learning-hero{align-items:center}.course-goals{background:linear-gradient(120deg, #14b8a617, transparent 48%), var(--surface);box-shadow:var(--shadow-sm);border:1px solid #14b8a633;border-radius:18px;grid-template-columns:210px minmax(0,1fr);align-items:start;gap:18px;padding:18px 20px;display:grid}.course-goals>div>span{color:var(--teal-600);letter-spacing:.04em;text-transform:uppercase;align-items:center;gap:8px;font-size:11px;font-weight:850;display:inline-flex}.course-goals ul{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:0;padding:0;list-style:none;display:grid}.course-goals li{color:var(--ink-soft);align-items:flex-start;gap:8px;font-size:11px;font-weight:700;line-height:1.5;display:flex}.course-goals li svg{color:#fff;background:var(--teal-500);border-radius:50%;flex:none;width:18px;height:18px;padding:3px}.pdf-course-outline{overscroll-behavior:contain;scrollbar-width:thin;max-height:calc(100vh - 100px);overflow-y:auto}.course-player{scroll-margin-top:92px}.course-player-toolbar{border:1px solid var(--line);background:var(--surface);border-bottom:0;border-radius:19px 19px 0 0;justify-content:space-between;align-items:center;gap:18px;padding:15px 18px;display:flex}.course-player-toolbar>div{gap:4px;min-width:0;display:grid}.course-player-toolbar span{color:var(--violet-600);letter-spacing:.07em;text-transform:uppercase;font-size:9px;font-weight:850}.course-player-toolbar strong{text-overflow:ellipsis;white-space:nowrap;font-size:13px;overflow:hidden}.course-player-toolbar button{border:1px solid var(--line);min-height:44px;color:var(--ink-soft);background:var(--surface-soft);border-radius:11px;flex:none;align-items:center;gap:7px;padding:0 12px;font-size:10px;font-weight:800;display:inline-flex}.course-player-toolbar button:hover{color:var(--violet-600);border-color:#8b5cf64d}.course-card-progress{background:var(--line);width:100%;height:5px;accent-color:var(--violet-600);border:0;display:block;overflow:hidden}.course-card-progress::-webkit-progress-bar{background:var(--line)}.course-card-progress::-webkit-progress-value{background:linear-gradient(90deg, var(--violet-600), var(--teal-500));border-radius:999px}.course-card-progress::-moz-progress-bar{background:linear-gradient(90deg, var(--violet-600), var(--teal-500));border-radius:999px}.course-concept-card{--stage-color:var(--violet-600);border:1px solid var(--line);background:radial-gradient(circle at 100% 0, #8b5cf614, transparent 30%), var(--surface);min-height:560px;box-shadow:var(--shadow-sm);border-top:0;border-radius:0 0 22px 22px;grid-template-columns:54px minmax(0,1fr);display:grid}.course-concept-card.stage-definition{--stage-color:var(--blue-600)}.course-concept-card.stage-method{--stage-color:var(--teal-600)}.course-concept-card.stage-example{--stage-color:var(--coral-500)}.course-concept-card.stage-recap{--stage-color:var(--green-600)}.course-card-rail{border-right:1px solid var(--line);background:var(--surface-soft);align-content:start;justify-items:center;gap:12px;padding-top:30px;display:grid}@supports (color:color-mix(in lab, red, red)){.course-card-rail{background:color-mix(in srgb, var(--surface-soft) 82%, transparent)}}.course-card-rail span{color:#fff;background:var(--stage-color);width:31px;height:31px;box-shadow:0 8px 20px var(--stage-color);border-radius:10px;place-items:center;display:grid}@supports (color:color-mix(in lab, red, red)){.course-card-rail span{box-shadow:0 8px 20px color-mix(in srgb, var(--stage-color) 28%, transparent)}}.course-card-rail span{font-size:9px;font-weight:900}.course-card-rail i{background:linear-gradient(var(--stage-color), transparent);opacity:.35;border-radius:999px;width:2px;height:95px}.course-card-content{min-width:0;padding:clamp(25px,4vw,46px)}.course-card-header{justify-content:space-between;align-items:center;margin-bottom:20px;display:flex}.course-card-header>div{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.course-stage{border:1px solid var(--stage-color);align-items:center;min-height:29px;padding:0 10px;display:inline-flex}@supports (color:color-mix(in lab, red, red)){.course-stage{border:1px solid color-mix(in srgb, var(--stage-color) 24%, transparent)}}.course-stage{color:var(--stage-color);background:var(--stage-color);border-radius:999px}@supports (color:color-mix(in lab, red, red)){.course-stage{background:color-mix(in srgb, var(--stage-color) 8%, var(--surface))}}.course-stage{letter-spacing:.07em;text-transform:uppercase;font-size:9px;font-weight:900}.course-card-header small{color:var(--ink-faint);font-size:10px;font-weight:750}.course-concept-card h2{letter-spacing:-.046em;max-width:780px;margin-bottom:13px;font-size:clamp(25px,3.2vw,38px);line-height:1.08}.course-card-question{max-width:780px;color:var(--stage-color);margin-bottom:10px;font-size:15px;font-weight:850;line-height:1.45}.course-card-body{max-width:790px;color:var(--ink-soft);margin-bottom:20px;font-size:14px;line-height:1.76}.course-bridge{border-left:3px solid var(--teal-500);background:var(--teal-100);border-radius:0 12px 12px 0;align-items:flex-start;gap:10px;max-width:790px;margin-bottom:18px;padding:12px 14px;display:flex}@supports (color:color-mix(in lab, red, red)){.course-bridge{background:color-mix(in srgb, var(--teal-100) 38%, var(--surface))}}.course-bridge svg{color:var(--teal-600);flex:none;margin-top:2px}.course-bridge p{color:var(--ink-soft);margin:0;font-size:11px;font-weight:700;line-height:1.55}.course-formulas{gap:8px;max-width:860px;margin-bottom:20px;display:grid}.course-formulas>div{border:1px solid var(--stage-color);padding:12px 14px;overflow-x:auto}@supports (color:color-mix(in lab, red, red)){.course-formulas>div{border:1px solid color-mix(in srgb, var(--stage-color) 18%, var(--line))}}.course-formulas>div{color:var(--ink);background:linear-gradient(125deg, var(--stage-color), var(--surface));border-radius:12px}@supports (color:color-mix(in lab, red, red)){.course-formulas>div{background:linear-gradient(125deg, color-mix(in srgb, var(--stage-color) 8%, var(--surface)), var(--surface))}}.course-formulas>div{white-space:nowrap;font-family:Cambria Math,Cambria,Times New Roman,serif;font-size:clamp(14px,2vw,17px);font-weight:650;line-height:1.5}.course-step-list{gap:10px;max-width:830px;margin:0 0 20px;padding:0;list-style:none;display:grid}.course-step-list li{grid-template-columns:30px minmax(0,1fr);align-items:start;gap:11px;display:grid}.course-step-list li>span{width:30px;height:30px;color:var(--stage-color);background:var(--stage-color);border-radius:9px;place-items:center;display:grid}@supports (color:color-mix(in lab, red, red)){.course-step-list li>span{background:color-mix(in srgb, var(--stage-color) 10%, var(--surface))}}.course-step-list li>span{font-size:10px;font-weight:900}.course-step-list p{color:var(--ink-soft);margin:4px 0 0;font-size:12px;line-height:1.55}.course-table-wrap{border:1px solid var(--line);border-radius:14px;max-width:880px;margin-bottom:20px;overflow-x:auto}.course-table-wrap table{border-collapse:collapse;width:100%;min-width:520px;font-size:11px}.course-table-wrap th,.course-table-wrap td{border-right:1px solid var(--line);border-bottom:1px solid var(--line);text-align:left;padding:11px 12px}.course-table-wrap th{color:var(--ink-soft);background:var(--surface-soft);letter-spacing:.04em;text-transform:uppercase;font-size:9px}.course-table-wrap tr:last-child td{border-bottom:0}.course-table-wrap th:last-child,.course-table-wrap td:last-child{border-right:0}.course-trap{background:#f59e0b14;border:1px solid #f59e0b40;border-radius:13px;align-items:flex-start;gap:11px;max-width:820px;margin-bottom:20px;padding:14px;display:flex}.course-trap svg{color:var(--amber-500);flex:none}.course-trap strong{margin-bottom:4px;font-size:11px;display:block}.course-trap p{color:var(--ink-soft);margin:0;font-size:11px;line-height:1.55}.course-source{border-top:1px solid var(--line);max-width:830px;margin-top:22px}.course-source summary{min-height:44px;color:var(--ink-faint);cursor:pointer;align-items:center;gap:7px;font-size:9px;font-weight:750;display:inline-flex}.course-source p{color:var(--ink-faint);margin:0 0 12px;font-size:10px;line-height:1.55}.course-quick-check{background:radial-gradient(circle at 100% 0, #8b5cf61a, transparent 34%), var(--surface-soft);border:1px solid #7c3aed2e;border-radius:16px;max-width:820px;margin-top:20px;padding:17px}.course-quick-check>span{color:var(--violet-600);letter-spacing:.06em;text-transform:uppercase;align-items:center;gap:7px;font-size:9px;font-weight:900;display:inline-flex}.course-quick-check h3{margin:8px 0 12px;font-size:15px;line-height:1.45}.course-quick-check>div{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;display:grid}.course-quick-check button{border:1px solid var(--line);background:var(--surface);text-align:left;border-radius:11px;align-items:center;gap:9px;min-height:48px;padding:8px 11px;font-size:11px;font-weight:700;display:flex}.course-quick-check button>span{width:25px;height:25px;color:var(--violet-600);background:var(--violet-100);border-radius:8px;flex:none;place-items:center;font-size:9px;font-weight:900;display:grid}.course-quick-check button.selected.correct{background:var(--green-100);border-color:#16a34a6b}@supports (color:color-mix(in lab, red, red)){.course-quick-check button.selected.correct{background:color-mix(in srgb, var(--green-100) 52%, var(--surface))}}.course-quick-check button.selected.incorrect{background:var(--coral-100);border-color:#e11d6559}@supports (color:color-mix(in lab, red, red)){.course-quick-check button.selected.incorrect{background:color-mix(in srgb, var(--coral-100) 45%, var(--surface))}}.course-quick-check>p{margin:12px 0 0;font-size:11px;line-height:1.55}.course-quick-check>p.correct{color:var(--green-600)}.course-quick-check>p.incorrect{color:var(--coral-600)}.learning-interactive{background:var(--surface);border:1px solid #8b5cf633;border-radius:18px;max-width:880px;margin:22px 0;overflow:hidden;box-shadow:0 12px 34px #2c1e5512}.learning-interactive-head{border-bottom:1px solid var(--line);background:var(--surface-soft);justify-content:space-between;align-items:center;gap:14px;padding:14px 16px;display:flex}.learning-interactive-head>div{gap:3px;display:grid}.learning-interactive-head span{color:var(--ink-soft);letter-spacing:.05em;text-transform:uppercase;font-size:9px;font-weight:850}.learning-interactive-head output{color:var(--violet-600);font-family:Cambria Math,Cambria,serif;font-size:13px;font-weight:800}.learning-interactive-head button{border:1px solid var(--line);min-height:44px;color:var(--ink-soft);background:var(--surface);border-radius:10px;align-items:center;gap:7px;padding:0 11px;font-size:9px;font-weight:800;display:inline-flex}.learning-interactive canvas{background:var(--surface);width:100%;height:290px;display:block}.learning-range,.learning-range-pair{border-top:1px solid var(--line);gap:8px;padding:12px 16px;display:grid}.learning-range-pair{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.learning-range-pair label{gap:8px;display:grid}.learning-range span,.learning-range-pair span{color:var(--ink-soft);font-size:9px;font-weight:800}.learning-range input,.learning-range-pair input{width:100%;min-height:24px;accent-color:var(--violet-600)}.learning-interactive>p{color:var(--ink-soft);align-items:flex-start;gap:8px;margin:0;padding:13px 16px 16px;font-size:10px;font-weight:700;line-height:1.55;display:flex}.learning-interactive>p svg{color:var(--teal-600);flex:none}.learning-choice-tabs{border-bottom:1px solid var(--line);background:var(--surface-soft);grid-template-columns:repeat(3,1fr);gap:5px;padding:8px;display:grid}.learning-choice-tabs button{min-height:44px;color:var(--ink-soft);background:0 0;border:1px solid #0000;border-radius:10px;padding:0 8px;font-size:9px;font-weight:800}.learning-choice-tabs button.active{color:var(--violet-600);background:var(--surface);box-shadow:var(--shadow-sm);border-color:#8b5cf638}.learning-result{color:var(--ink-soft);background:var(--surface-soft);border-radius:11px;align-items:flex-start;gap:9px;margin:0 14px 14px;padding:12px;font-size:10px;line-height:1.5;display:flex}.learning-result svg{color:var(--violet-600);flex:none}.learning-select{align-items:center;gap:7px;display:flex}.learning-select select{border:1px solid var(--line);background:var(--surface);border-radius:9px;outline:0;min-width:62px;min-height:40px;padding:0 8px}.composition-machine{padding-bottom:2px}.machine-flow{align-items:center;gap:10px;padding:28px 16px;display:flex;overflow-x:auto}.machine-flow>svg{width:18px;color:var(--ink-faint);flex:none}.machine-flow>div,.machine-value{background:linear-gradient(135deg, var(--violet-50), var(--surface));text-align:center;border:1px solid #8b5cf638;border-radius:13px;place-content:center;gap:5px;min-width:118px;min-height:66px;padding:10px;display:grid}.theme-dark .machine-flow>div,.theme-dark .machine-value{background:var(--violet-600)}@supports (color:color-mix(in lab, red, red)){.theme-dark .machine-flow>div,.theme-dark .machine-value{background:color-mix(in srgb, var(--violet-600) 10%, var(--surface))}}.machine-flow small{color:var(--ink-faint);text-transform:uppercase;font-size:8px}.machine-flow strong,.machine-value{font-family:Cambria Math,Cambria,serif;font-size:12px}.course-card-navigation{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:13px;display:grid}.course-card-navigation>button,.course-card-navigation>a{border:1px solid var(--line);min-height:64px;color:var(--ink-soft);background:var(--surface);box-shadow:var(--shadow-sm);text-align:left;border-radius:15px;justify-content:space-between;align-items:center;gap:12px;padding:10px 15px;font-size:11px;font-weight:850;display:flex}.course-card-navigation>:disabled{opacity:.42;cursor:default}.course-card-navigation>.primary{color:#fff;background:linear-gradient(135deg, var(--violet-600), var(--violet-700));box-shadow:var(--shadow-violet);border-color:#0000}.course-card-navigation span{gap:3px;display:grid}.course-card-navigation small{opacity:.7;letter-spacing:.05em;text-transform:uppercase;font-size:8px}.course-revision-list{gap:14px;display:grid}.course-concept-card.revision{border-top:1px solid var(--line);border-radius:20px;min-height:0}.course-practice-preview{background:radial-gradient(circle at 100% 0, #14b8a61c, transparent 32%), var(--surface);box-shadow:var(--shadow-sm);border:1px solid #14b8a638;border-radius:19px;gap:15px;margin-top:18px;padding:21px;display:grid}.course-practice-preview>div:first-child>span{color:var(--teal-600);letter-spacing:.07em;text-transform:uppercase;font-size:9px;font-weight:900}.course-practice-preview h2{margin:6px 0 0;font-size:19px}.course-practice-preview>div:last-child{grid-template-columns:repeat(3,minmax(0,1fr));gap:9px;display:grid}.course-practice-preview a{border:1px solid var(--line);background:var(--surface-soft);border-radius:13px;align-content:start;gap:7px;min-width:0;min-height:110px;padding:13px;display:grid}.course-practice-preview a:hover{border-color:#8b5cf64d;transform:translateY(-2px)}.course-practice-preview a small{color:var(--violet-600);text-transform:uppercase;font-size:8px;font-weight:850}.course-practice-preview a strong{text-overflow:ellipsis;white-space:nowrap;font-size:12px;overflow:hidden}.course-practice-preview a span{color:var(--ink-soft);-webkit-line-clamp:2;-webkit-box-orient:vertical;font-size:9px;line-height:1.5;display:-webkit-box;overflow:hidden}.exercise-part-label{font-weight:800;color:var(--teal-600)!important;margin:-6px 0 8px!important;font-size:9px!important}.exercise-filter-row{scrollbar-width:thin;gap:7px;margin:0 0 17px;padding-bottom:6px;display:flex;overflow-x:auto}.exercise-filter-row button{border:1px solid var(--line);min-height:44px;color:var(--ink-soft);background:var(--surface-soft);border-radius:999px;flex:none;padding:0 12px;font-size:9px;font-weight:800}.exercise-filter-row button.active{color:#fff;background:var(--violet-600);border-color:#0000}.domain-tab-count{min-width:20px;height:20px;color:var(--ink-soft);background:var(--surface-soft);border-radius:999px;place-items:center;padding:0 6px;font-size:10px;line-height:1;display:inline-grid}.domain-tabs button.active .domain-tab-count{color:var(--violet-700);background:#fff}.simplified-solver{grid-template-columns:minmax(0,1fr)}.simplified-solver .pdf-solver-main{width:min(100%,1040px);margin-inline:auto}.exercise-method-access{background:var(--surface);box-shadow:var(--shadow-sm);border:1px solid #7c3aed33;border-radius:18px;overflow:hidden}.exercise-method-trigger{width:100%;min-height:72px;color:var(--ink);background:radial-gradient(circle at 100% 0, #8b5cf61f, transparent 38%), var(--surface);text-align:left;grid-template-columns:38px minmax(0,1fr) 24px;align-items:center;gap:12px;padding:14px 18px;display:grid}.exercise-method-trigger>svg:first-child{width:38px;height:38px;color:var(--violet-600);background:var(--violet-100);border-radius:12px;padding:9px;display:grid}.theme-dark .exercise-method-trigger>svg:first-child{background:#8b5cf629}.exercise-method-trigger strong,.exercise-method-trigger small{display:block}.exercise-method-trigger strong{margin-bottom:4px;font-size:13px}.exercise-method-trigger small{color:var(--ink-soft);font-size:10px;line-height:1.45}.exercise-method-trigger>svg:last-child{color:var(--violet-600);transition:transform .18s}.exercise-method-trigger[aria-expanded=true]>svg:last-child{transform:rotate(90deg)}.exercise-method-step{border-top:1px solid var(--line);background:var(--violet-100);padding:20px}@supports (color:color-mix(in lab, red, red)){.exercise-method-step{background:color-mix(in srgb, var(--violet-100) 25%, var(--surface))}}.exercise-method-step>div:first-child{justify-content:space-between;align-items:center;gap:12px;display:flex}.exercise-method-step>div:first-child span{color:var(--violet-600);letter-spacing:.07em;text-transform:uppercase;font-size:9px;font-weight:900}.exercise-method-step>div:first-child small{color:var(--ink-soft);background:var(--surface);border-radius:999px;padding:5px 8px;font-size:9px;font-weight:800}.exercise-method-step>p{max-width:860px;color:var(--ink-soft);margin:9px 0 0;font-size:clamp(14px,1.25vw,16px);font-weight:560;line-height:1.7}.exercise-method-step>p .katex{color:var(--violet-700);font-size:1.08em}.exercise-method-step>h2{max-width:900px;color:var(--ink);letter-spacing:-.02em;margin:16px 0 0;font-size:clamp(18px,1.8vw,22px);line-height:1.42}.exercise-method-checkpoint{background:var(--teal-100);border:1px solid #14b8a640;border-radius:11px;align-items:flex-start;gap:10px;max-width:860px;margin-top:16px;padding:12px 13px;display:flex}@supports (color:color-mix(in lab, red, red)){.exercise-method-checkpoint{background:color-mix(in srgb, var(--teal-100) 42%, var(--surface))}}.exercise-method-checkpoint>svg{color:var(--teal-600);flex:none;margin-top:1px}.exercise-method-checkpoint strong,.exercise-method-checkpoint span{display:block}.exercise-method-checkpoint strong{color:var(--ink);margin-bottom:3px;font-size:10px}.exercise-method-checkpoint span{color:var(--ink-soft);font-size:11px;line-height:1.55}.exercise-method-actions{justify-content:flex-end;gap:8px;margin-top:17px;display:flex}.exercise-method-actions button{border:1px solid var(--line);min-height:42px;color:var(--ink-soft);background:var(--surface);border-radius:10px;justify-content:center;align-items:center;gap:7px;padding:0 13px;font-size:10px;font-weight:850;display:inline-flex}.exercise-method-actions button.primary{color:#fff;background:var(--violet-600);border-color:#0000}.exercise-method-actions button:disabled{opacity:.45}.exercise-answer-checker{background:radial-gradient(circle at 100% 0, #8b5cf61c, transparent 42%), var(--surface-soft);border:1px solid #7c3aed38;border-radius:15px;gap:12px;margin-top:18px;padding:18px;display:grid}.exercise-answer-heading{justify-content:space-between;align-items:flex-end;gap:15px;display:flex}.exercise-answer-heading span,.exercise-answer-heading strong{display:block}.exercise-answer-heading span{color:var(--violet-600);letter-spacing:.07em;text-transform:uppercase;margin-bottom:4px;font-size:9px;font-weight:900}.exercise-answer-heading strong{font-size:13px}.exercise-answer-heading small,.exercise-answer-note{color:var(--ink-faint);font-size:9px}.exercise-answer-row{grid-template-columns:minmax(0,1fr) auto;gap:9px;display:grid}.exercise-answer-row input{border:1px solid var(--line-strong);width:100%;min-width:0;min-height:50px;color:var(--ink);background:var(--surface);border-radius:11px;outline:0;padding:0 14px;font-family:Cambria Math,Cambria,serif;font-size:15px}.exercise-answer-row input:focus{border-color:var(--violet-500);box-shadow:0 0 0 3px #8b5cf61c}.exercise-answer-row button{color:#fff;background:var(--violet-600);border-radius:11px;justify-content:center;align-items:center;gap:7px;min-height:50px;padding:0 17px;font-size:11px;font-weight:850;display:inline-flex}.exercise-answer-feedback{border:1px solid #0000;border-radius:11px;align-items:flex-start;gap:10px;padding:12px 13px;display:flex}.exercise-answer-feedback>svg{flex:none;margin-top:1px}.exercise-answer-feedback strong,.exercise-answer-feedback p{margin:0;display:block}.exercise-answer-feedback strong{margin-bottom:3px;font-size:11px}.exercise-answer-feedback p{font-size:9px;line-height:1.5}.exercise-answer-feedback.correct{color:var(--teal-600);background:#14b8a617;border-color:#14b8a63d}.exercise-answer-feedback.incomplete{color:var(--amber-600);background:#f59e0b17;border-color:#f59e0b40}.exercise-answer-feedback.incorrect{color:var(--coral-500);background:#f4725917;border-color:#f4725940}.exercise-answer-note{margin:0;line-height:1.5}.pdf-correction-card>button:disabled{opacity:.62;cursor:not-allowed}@media (width<=680px){.exercise-answer-heading,.exercise-method-actions{flex-direction:column;align-items:flex-start}.exercise-answer-row{grid-template-columns:1fr}.exercise-answer-row button,.exercise-method-actions button{width:100%}}.exercise-paths{border:1px solid var(--line);background:radial-gradient(circle at 8% 0, #7c3aed17, transparent 28%), var(--surface);box-shadow:var(--shadow-sm);border-radius:22px;padding:23px}.exercise-path-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;display:grid}.exercise-path-grid>button{border:1px solid var(--line);min-width:0;min-height:174px;color:var(--ink);background:var(--surface-soft);text-align:left;border-radius:16px;align-content:start;justify-items:start;gap:7px;padding:17px;transition:border-color .18s,transform .18s,background .18s;display:grid}.exercise-path-grid>button:hover,.exercise-path-grid>button.active{background:var(--surface);border-color:#7c3aed6b}@supports (color:color-mix(in lab, red, red)){.exercise-path-grid>button:hover,.exercise-path-grid>button.active{background:color-mix(in srgb, var(--surface) 90%, var(--violet-100))}}.exercise-path-grid>button:hover,.exercise-path-grid>button.active{transform:translateY(-2px)}.exercise-path-grid>button.active{box-shadow:inset 0 0 0 1px #7c3aed33}.exercise-path-icon{width:37px;height:37px;color:var(--violet-600);background:var(--surface);border-radius:12px;place-items:center;display:grid}@supports (color:color-mix(in lab, red, red)){.exercise-path-icon{background:color-mix(in srgb, var(--surface) 74%, var(--violet-100))}}.exercise-path-grid small{color:var(--violet-600);letter-spacing:.045em;text-transform:uppercase;font-size:9px;font-weight:850}.exercise-path-grid strong{font-size:15px}.exercise-path-grid p{color:var(--ink-soft);margin:0;font-size:10px;line-height:1.55}.exercise-search-row{grid-template-columns:minmax(220px,1fr) minmax(145px,.32fr) minmax(165px,.36fr) auto;gap:8px;margin-bottom:13px;display:grid}.exercise-search-row label,.exercise-search-row input,.exercise-search-row select,.exercise-search-row>button{min-width:0}.exercise-search-row input,.exercise-search-row select,.exercise-search-row>button{border:1px solid var(--line);width:100%;min-height:43px;color:var(--ink);background:var(--surface-soft);font:inherit;border-radius:12px;padding:0 12px;font-size:10px;font-weight:720}.exercise-search-row input:focus,.exercise-search-row select:focus{border-color:var(--violet-500);outline:3px solid #7c3aed1c}.exercise-search-row>button{color:var(--violet-600);cursor:pointer}.exercise-format-line{color:var(--ink-soft);flex-wrap:wrap;gap:7px 12px;margin:0 0 10px;font-size:9px;font-weight:780;display:flex}.exercise-format-line span{align-items:center;gap:5px;display:inline-flex}.exercise-format-line span:first-child{color:var(--violet-600)}.exercise-skill-list{flex-wrap:wrap;gap:5px;margin-bottom:12px;display:flex}.exercise-skill-list span{border:1px solid var(--line);padding:4px 7px}@supports (color:color-mix(in lab, red, red)){.exercise-skill-list span{border:1px solid color-mix(in srgb, var(--line) 78%, var(--violet-200))}}.exercise-skill-list span{color:var(--ink-soft);background:var(--surface-soft);border-radius:999px;font-size:8px;font-weight:750}.pdf-exercise-card .exercise-level{color:var(--violet-700);background:var(--surface)}@supports (color:color-mix(in lab, red, red)){.pdf-exercise-card .exercise-level{background:color-mix(in srgb, var(--surface) 72%, var(--violet-100))}}.pdf-exercise-card .level-intermediaire{color:#4f46e5;background:#6366f11a}.pdf-exercise-card .level-niveau-bac{color:#b45309;background:#f59e0b1f}.pdf-exercise-card .level-expert{color:#be185d;background:#ec48991a}.difficulty-card-expert{background:linear-gradient(145deg, #ec48990e, transparent 44%), var(--surface);border-color:#ec489933}.exercise-empty-state{border:1px dashed var(--line);min-height:230px;color:var(--ink-soft);text-align:center;border-radius:17px;align-content:center;place-items:center;gap:8px;padding:28px;display:grid}.exercise-empty-state svg,.exercise-empty-state h3{color:var(--violet-600)}.exercise-empty-state p{margin:0 0 6px;font-size:11px}.exercise-visual-lab{border-top:1px solid var(--line);gap:8px;margin-top:18px;padding-top:17px;display:grid}.exercise-visual-lab>span{color:var(--violet-600);align-items:center;gap:6px;font-size:10px;font-weight:850;display:inline-flex}.exercise-visual-lab>p{color:var(--ink-soft);margin:0;font-size:10px;line-height:1.55}@media (width<=1040px){.exercise-path-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.exercise-search-row{grid-template-columns:minmax(0,1fr) minmax(140px,.45fr)}}@media (width<=680px){.exercise-paths,.pdf-bank-section,.pdf-supplement-section{padding:16px}.exercise-path-grid,.exercise-search-row{grid-template-columns:1fr}.exercise-path-grid>button{min-height:0}}.solver-heading-actions{z-index:1;justify-items:end;gap:8px;display:grid;position:relative}.solver-heading-actions>span{color:var(--teal-600);align-items:center;gap:6px;font-size:9px;font-weight:800;display:inline-flex}.high-ux-solver{grid-template-columns:minmax(0,1fr) 330px}.formula-workbench,.notebook-workspace,.puzzle-deck{border:1px solid var(--line);background:var(--surface);box-shadow:var(--shadow-sm);border-radius:19px}.formula-workbench,.notebook-workspace{padding:22px}.formula-workbench-actions{flex-wrap:wrap;gap:8px;margin-bottom:12px;display:flex}.formula-workbench-actions button{border:1px solid var(--line);min-height:44px;color:var(--violet-600);background:var(--surface-soft);border-radius:10px;align-items:center;gap:7px;padding:0 12px;font-size:10px;font-weight:800;display:inline-flex}.formula-workbench-actions button:disabled{color:var(--ink-faint);opacity:.6}.formula-lines{gap:9px;display:grid}.formula-line{border:1px solid var(--line);background:var(--surface-soft);border-radius:14px;grid-template-columns:62px minmax(0,1fr) 42px;align-items:stretch;min-width:0;transition:border-color .18s,box-shadow .18s;display:grid}.formula-line.active{border-color:#8b5cf67a;box-shadow:0 0 0 3px #8b5cf614}.formula-line-number{border-right:1px solid var(--line);text-align:center;background:0 0;border-radius:13px 0 0 13px;place-content:center;gap:3px;display:grid}.formula-line-number>span{width:30px;height:30px;color:var(--violet-600);background:var(--violet-100);border-radius:9px;place-items:center;font-size:10px;font-weight:900;display:grid}.theme-dark .formula-line-number>span{background:#8b5cf626}.formula-line-number small{color:var(--ink-faint);text-transform:uppercase;font-size:7px}.formula-line-content{flex-wrap:wrap;align-content:center;gap:7px;min-width:0;min-height:76px;padding:10px;display:flex}.formula-line-content>p{color:var(--ink-faint);align-self:center;margin:0;font-family:Inter,sans-serif;font-size:10px}.formula-line-actions{border-left:1px solid var(--line);align-content:center;gap:3px;padding:5px;display:grid}.formula-line-actions button{width:32px;min-height:32px;color:var(--ink-faint);background:0 0;border-radius:8px;place-items:center;display:grid}.formula-line-actions button:hover{color:var(--violet-600);background:var(--surface)}.formula-line-actions button:disabled{opacity:.3}.formula-token{min-height:39px;color:var(--ink);background:var(--surface);border:1px solid #7c3aed38;border-radius:9px 13px 13px 9px;align-items:center;gap:4px;padding:4px 5px 4px 10px;font-family:Cambria Math,Cambria,serif;font-size:13px;font-weight:700;display:inline-flex}.formula-token.editable{background:var(--teal-100);border-style:dashed;border-color:#14b8a68c}@supports (color:color-mix(in lab, red, red)){.formula-token.editable{background:color-mix(in srgb, var(--teal-100) 34%, var(--surface))}}.formula-token input{border:0;border-bottom:2px solid var(--teal-500);text-align:center;background:0 0;outline:0;width:clamp(60px,10vw,115px);min-height:30px;padding:0 7px;font-family:Cambria Math,Cambria,serif}.formula-token>button{width:28px;min-height:28px;color:var(--ink-faint);background:0 0;border-radius:8px;place-items:center;display:grid}.formula-token>button:hover{color:#fff;background:var(--coral-500)}.formula-preview{border:1px dashed var(--line-strong);background:var(--surface-soft);border-radius:12px;gap:7px;margin-top:12px;padding:13px;display:grid}.formula-preview>span{color:var(--ink-faint);letter-spacing:.05em;text-transform:uppercase;font-size:8px;font-weight:850}.formula-preview output{white-space:pre-wrap;min-height:21px;font-family:Cambria Math,Cambria,serif;font-size:13px;line-height:1.7;overflow-x:auto}.notebook-heading{justify-content:space-between;align-items:flex-end;gap:15px;margin-bottom:14px;display:flex}.notebook-heading>div>span{color:var(--teal-600);letter-spacing:.06em;text-transform:uppercase;align-items:center;gap:7px;font-size:9px;font-weight:900;display:inline-flex}.notebook-heading h2{margin:6px 0 0;font-size:19px}.notebook-heading small{color:var(--ink-faint);font-size:9px}.notebook-formula-composer{background:radial-gradient(circle at 100% 0, #8b5cf61a, transparent 40%), var(--surface-soft);border:1px solid #7c3aed38;border-radius:14px;gap:10px;margin-top:18px;padding:14px;display:grid}.notebook-composer-heading{justify-content:space-between;align-items:flex-start;gap:12px;display:flex}.notebook-composer-heading>div:first-child span,.notebook-composer-heading>div:first-child strong{display:block}.notebook-composer-heading>div:first-child span{color:var(--violet-600);letter-spacing:.07em;text-transform:uppercase;margin-bottom:4px;font-size:8px;font-weight:900}.notebook-composer-heading>div:first-child strong{font-size:11px;line-height:1.45}.notebook-composer-heading>div:last-child{flex-wrap:wrap;justify-content:flex-end;gap:6px;display:flex}.notebook-composer-heading button{border:1px solid var(--line);min-height:34px;color:var(--ink-soft);background:var(--surface);border-radius:8px;align-items:center;gap:6px;padding:0 9px;font-size:8px;font-weight:800;display:inline-flex}.notebook-composer-heading button:disabled,.notebook-composer-actions button:disabled,.notebook-manual-entry>button:disabled{cursor:not-allowed;opacity:.42}.notebook-formula-stage{min-height:92px;color:var(--ink-faint);background:var(--surface);text-align:center;border:1px dashed #7c3aed4d;border-radius:12px;justify-content:center;align-items:center;padding:18px;display:flex;overflow-x:auto}.notebook-formula-stage.has-formula{color:var(--ink);border-style:solid;box-shadow:inset 0 0 0 1px #8b5cf60a}.notebook-formula-stage .katex{color:var(--ink);font-size:clamp(1.16em,2vw,1.45em)}.notebook-manual-entry{grid-template-columns:minmax(0,1fr) auto;align-items:end;gap:8px;display:grid}.notebook-manual-entry label>span{color:var(--ink-soft);margin-bottom:5px;font-size:9px;font-weight:750;display:block}.notebook-manual-entry input{border:1px solid var(--line-strong);width:100%;min-height:42px;color:var(--ink);background:var(--surface);border-radius:9px;outline:0;padding:0 12px;font-family:Cambria Math,Cambria,serif;font-size:13px}.notebook-manual-entry input:focus{border-color:var(--violet-500);box-shadow:0 0 0 3px #8b5cf61a}.notebook-manual-entry>button,.notebook-composer-actions>button{color:#fff;background:var(--violet-600);border-radius:9px;justify-content:center;align-items:center;gap:6px;min-height:42px;padding:0 13px;font-size:9px;font-weight:850;display:inline-flex}.notebook-composer-actions{justify-content:flex-end;display:flex}.notebook-formula-lines{border:1px solid var(--line);background:var(--surface);border-radius:13px;margin-top:10px;overflow:hidden}.notebook-formula-lines>div{border-bottom:1px solid var(--line);background:var(--surface-soft);justify-content:space-between;align-items:center;gap:10px;min-height:42px;padding:8px 12px;display:flex}.notebook-formula-lines>div strong{font-size:10px}.notebook-formula-lines>div small{color:var(--ink-faint);font-size:8px}.notebook-formula-lines ol{gap:0;margin:0;padding:0;list-style:none;display:grid}.notebook-formula-lines li{border-bottom:1px solid var(--line);grid-template-columns:30px minmax(0,1fr) auto;align-items:center;gap:10px;min-width:0;padding:12px;display:grid}.notebook-formula-lines li:last-child{border-bottom:0}.notebook-formula-lines li>span{width:26px;height:26px;color:var(--violet-700);background:var(--violet-100);border-radius:8px;place-items:center;font-size:9px;font-weight:900;display:grid}.notebook-formula-lines li>div:nth-child(2){min-width:0;padding-block:4px;overflow-x:auto}.notebook-formula-lines li>div:nth-child(2) .katex{font-size:1.06em}.notebook-formula-lines li>div:last-child{gap:5px;display:flex}.notebook-formula-lines li button{border:1px solid var(--line);min-height:32px;color:var(--ink-soft);background:var(--surface-soft);border-radius:8px;padding:0 8px;font-size:8px;font-weight:800}.notebook-tool-heading{justify-content:space-between;align-items:center;gap:12px;margin:18px 0 8px;display:flex}.notebook-tool-heading.compact{margin-top:10px}.notebook-symbols.compact{flex-wrap:wrap;overflow-x:visible}.notebook-symbols.compact button{min-width:38px;min-height:38px}.notebook-tool-heading strong,.notebook-tool-heading small{display:block}.notebook-tool-heading strong{color:var(--ink);font-size:12px}.notebook-tool-heading small{color:var(--ink-faint);margin-top:3px;font-size:9px}.notebook-symbols{border:1px solid var(--line);background:var(--surface-soft);scrollbar-width:thin;border-radius:12px;gap:6px;padding:9px;display:flex;overflow-x:auto}.notebook-symbols button{border:1px solid var(--line);min-width:44px;min-height:44px;color:var(--violet-700);background:var(--surface);border-radius:9px;flex:none;padding:0 9px;font-family:Cambria Math,Cambria,serif;font-size:13px;font-weight:750}.notebook-symbols button:hover,.notebook-symbols button:focus-visible{background:var(--violet-100);border-color:#7c3aed75}@supports (color:color-mix(in lab, red, red)){.notebook-symbols button:hover,.notebook-symbols button:focus-visible{background:color-mix(in srgb, var(--violet-100) 58%, var(--surface))}}.notebook-symbols button:hover,.notebook-symbols button:focus-visible{transform:translateY(-1px)}.notebook-symbols button .katex{font-size:1.08em}.theme-dark .notebook-symbols button{color:var(--violet-400)}.notebook-custom-tools{border:1px solid var(--line);background:var(--surface-soft);border-radius:13px;margin-top:9px}.notebook-custom-tools summary{cursor:pointer;justify-content:space-between;align-items:center;gap:14px;min-height:52px;padding:10px 13px;list-style:none;display:flex}.notebook-custom-tools summary::-webkit-details-marker{display:none}.notebook-custom-tools summary>span{color:var(--violet-700);align-items:center;gap:7px;font-size:11px;font-weight:850;display:inline-flex}.notebook-custom-tools summary>span svg{background:var(--violet-100);border-radius:6px;padding:3px}.notebook-custom-tools summary>small{color:var(--ink-faint);font-size:9px}.notebook-custom-tools[open] summary{border-bottom:1px solid var(--line)}.notebook-template-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;padding:12px;display:grid}.notebook-template-grid>section{border:1px solid var(--line);background:var(--surface);border-radius:11px;flex-direction:column;gap:10px;min-width:0;padding:12px;display:flex}.notebook-template-grid>section>div:first-child{justify-content:space-between;align-items:center;gap:8px;min-height:29px;display:flex}.notebook-template-grid>section>div:first-child strong{font-size:10px}.notebook-template-grid>section>div:first-child .katex{color:var(--violet-700);font-size:1.02em}.notebook-template-fields{grid-template-columns:repeat(2,minmax(0,1fr));gap:7px;display:grid}.notebook-template-fields.limit-fields{grid-template-columns:.72fr 1fr 1.3fr}.notebook-template-fields label span{color:var(--ink-faint);margin-bottom:4px;font-size:8px;font-weight:750;display:block}.notebook-template-fields input,.notebook-template-fields select{border:1px solid var(--line-strong);width:100%;min-width:0;height:36px;color:var(--ink);background:var(--surface-soft);border-radius:8px;outline:0;padding:0 8px;font-size:10px}.notebook-template-fields input:focus,.notebook-template-fields select:focus{border-color:var(--violet-500);box-shadow:0 0 0 3px #8b5cf61a}.notebook-template-grid>section>button{min-height:38px;color:var(--violet-700);background:var(--violet-100);border:1px solid #7c3aed40;border-radius:9px;justify-content:center;align-items:center;gap:6px;margin-top:auto;display:inline-flex}@supports (color:color-mix(in lab, red, red)){.notebook-template-grid>section>button{background:color-mix(in srgb, var(--violet-100) 44%, var(--surface))}}.notebook-template-grid>section>button{font-size:9px;font-weight:850}.notebook-math-preview{background:var(--violet-100);border:1px dashed #7c3aed52;border-radius:11px;gap:7px;margin-top:9px;padding:12px 13px;display:grid}@supports (color:color-mix(in lab, red, red)){.notebook-math-preview{background:color-mix(in srgb, var(--violet-100) 25%, var(--surface))}}.notebook-math-preview>span{color:var(--violet-600);letter-spacing:.07em;text-transform:uppercase;font-size:8px;font-weight:900}.notebook-math-preview>div{color:var(--ink);white-space:pre-wrap;font-size:14px;line-height:1.7;overflow-x:auto}@media (width<=860px){.notebook-template-grid{grid-template-columns:1fr}.notebook-custom-tools summary{flex-direction:column;justify-content:center;align-items:flex-start}.notebook-composer-heading{flex-direction:column}.notebook-composer-heading>div:last-child{justify-content:flex-start;width:100%}}@media (width<=520px){.notebook-template-fields.limit-fields{grid-template-columns:repeat(2,minmax(0,1fr))}.notebook-template-fields.limit-fields label:last-child{grid-column:1/-1}.notebook-manual-entry{grid-template-columns:1fr}.notebook-manual-entry>button,.notebook-composer-actions>button{width:100%}.notebook-formula-lines li{grid-template-columns:28px minmax(0,1fr)}.notebook-formula-lines li>div:last-child{grid-column:2}}.notebook-workspace .pdf-scratchpad{margin-top:10px}.notebook-workspace .pdf-scratchpad textarea{min-height:260px}.puzzle-deck{overflow:hidden}.puzzle-deck-heading{border-bottom:1px solid var(--line);background:radial-gradient(circle at 100% 0, #8b5cf621, transparent 45%), var(--surface-soft);padding:17px}.puzzle-deck-heading>span{color:var(--violet-600);letter-spacing:.05em;text-transform:uppercase;align-items:center;gap:7px;font-size:10px;font-weight:900;display:inline-flex}.puzzle-deck-heading p{color:var(--ink-soft);margin:8px 0 0;font-size:9px;line-height:1.55}.puzzle-group{border-bottom:1px solid var(--line);padding:14px 15px}.puzzle-group:last-child{border-bottom:0}.puzzle-group h3{color:var(--ink-soft);letter-spacing:.06em;text-transform:uppercase;margin-bottom:9px;font-size:9px}.puzzle-group>div{flex-wrap:wrap;gap:6px;display:flex}.puzzle-group button{min-height:44px;color:var(--violet-700);background:var(--surface);text-align:left;border:1px solid #7c3aed30;border-radius:9px 12px 12px 9px;align-items:center;gap:5px;padding:6px 9px;font-family:Cambria Math,Cambria,serif;font-size:11px;font-weight:750;display:inline-flex}.theme-dark .puzzle-group button{color:var(--violet-400)}.puzzle-group button:hover{color:#fff;background:var(--violet-600);border-color:#0000;transform:translateY(-1px)}.puzzle-group button.editable{color:var(--teal-600);border-style:dashed;border-color:#14b8a65c}.puzzle-group button.editable:hover{color:#fff;background:var(--teal-600)}@media (width<=1180px){.course-goals{grid-template-columns:170px minmax(0,1fr)}.course-goals ul{grid-template-columns:1fr}.high-ux-solver{grid-template-columns:minmax(0,1fr) 300px}}@media (width<=980px){.pdf-course-outline{max-height:none;overflow:visible}.pdf-course-outline nav{scroll-snap-type:x proximity;grid-template-columns:none;grid-auto-columns:minmax(220px,260px);grid-auto-flow:column;overflow-x:auto}.pdf-course-outline nav a{scroll-snap-align:start}.course-concept-card{min-height:500px}.pdf-solver-side{grid-row:auto;grid-template-columns:minmax(0,.78fr) minmax(0,1.22fr)}.pdf-workspace-tip{grid-column:1/-1}}@media (width<=760px){.course-goals{grid-template-columns:1fr}.course-player-toolbar{flex-direction:column;align-items:flex-start}.course-player-toolbar button{justify-content:center;width:100%}.course-concept-card{grid-template-columns:42px minmax(0,1fr);min-height:0}.course-card-rail{padding-top:24px}.course-card-rail span{width:27px;height:27px}.course-card-content{padding:24px 19px}.course-quick-check>div,.learning-range-pair,.course-card-navigation,.course-practice-preview>div:last-child{grid-template-columns:1fr}.learning-interactive canvas{height:250px}.learning-interactive-head{flex-direction:column;align-items:flex-start}.learning-interactive-head>button{justify-content:center;width:100%}.course-card-navigation{z-index:20;position:sticky;bottom:78px}.course-card-navigation>button,.course-card-navigation>a{min-height:56px}.formula-workbench,.notebook-workspace{padding:17px}.notebook-heading,.solver-heading-actions{flex-direction:column;place-items:flex-start stretch;width:100%}.solver-heading-actions>.button{width:100%}.pdf-solver-side{grid-template-columns:1fr}.pdf-workspace-tip{grid-column:auto}}@media (width<=520px){.course-goals,.formula-workbench,.notebook-workspace{border-radius:16px;padding:15px}.course-concept-card{display:block}.course-card-rail{display:none}.course-card-content{padding:22px 17px}.course-card-header>div{flex-direction:column;align-items:flex-start}.course-concept-card h2{font-size:27px}.course-card-question{font-size:14px}.learning-choice-tabs{grid-template-columns:1fr}.machine-flow{padding-block:20px}.formula-line{grid-template-columns:48px minmax(0,1fr)}.formula-line-actions{border-top:1px solid var(--line);border-left:0;grid-area:2/1/auto/-1;grid-template-columns:repeat(4,1fr)}.formula-line-actions button{width:auto;min-height:40px}.formula-line-number{min-height:76px}.formula-token{max-width:100%}.formula-token input{width:70px}.notebook-workspace .pdf-scratchpad textarea{min-height:220px}.course-card-navigation{bottom:76px}}.mobile-puzzle-drawer{display:none}.method-diagnosis{background:var(--teal-100);border:1px solid #14b8a633;border-radius:11px;margin-bottom:14px;padding:12px}@supports (color:color-mix(in lab, red, red)){.method-diagnosis{background:color-mix(in srgb, var(--teal-100) 34%, var(--surface))}}.method-diagnosis strong{color:var(--teal-600);letter-spacing:.06em;text-transform:uppercase;margin-bottom:4px;font-size:8px;display:block}.method-diagnosis p{color:var(--ink-soft);margin:0;font-size:10px;line-height:1.55}.method-revealed-hints{gap:7px;margin-top:13px;display:grid}.method-revealed-hints p{color:var(--ink-soft);background:#f59e0b14;border-radius:9px;align-items:flex-start;gap:7px;margin:0;padding:9px;font-size:9px;line-height:1.5;display:flex}.method-revealed-hints svg{color:var(--amber-500);flex:none}.formula-line{grid-template-columns:62px minmax(0,1fr) 54px}.formula-line-actions button,.formula-token>button{width:44px;min-height:44px}.formula-token{min-height:48px}.formula-token input:focus-visible,.learning-select select:focus-visible{outline-offset:2px;border-color:var(--violet-500);outline:3px solid #8b5cf68c}.learning-range input,.learning-range-pair input{min-height:44px}@media (width<=980px){.pdf-solver-side>.puzzle-deck{display:none}.mobile-puzzle-drawer{z-index:60;width:min(370px,100vw - 36px);display:block;position:fixed;bottom:18px;right:18px}.mobile-puzzle-drawer>summary{color:#fff;background:linear-gradient(135deg, var(--violet-700), var(--violet-600));min-height:56px;box-shadow:var(--shadow-violet);cursor:pointer;border:1px solid #8b5cf647;border-radius:15px;justify-content:space-between;align-items:center;gap:12px;padding:10px 14px;list-style:none;display:flex}.mobile-puzzle-drawer>summary::-webkit-details-marker{display:none}.mobile-puzzle-drawer>summary>span{align-items:center;gap:8px;font-size:11px;font-weight:850;display:inline-flex}.mobile-puzzle-drawer>summary small{opacity:.76;font-size:8px}.mobile-puzzle-drawer[open]{border:1px solid var(--line);background:var(--surface);width:min(430px,100vw - 36px);box-shadow:var(--shadow-md);overscroll-behavior:contain;border-radius:18px;top:76px;bottom:18px;right:18px;overflow-y:auto}.mobile-puzzle-drawer[open]>summary{z-index:2;box-shadow:none;border-radius:17px 17px 0 0;position:sticky;top:0}.mobile-puzzle-drawer>.puzzle-deck{box-shadow:none;border:0;border-radius:0 0 17px 17px}}@media (width<=760px){.pdf-course-layout{flex-direction:column;display:flex}.pdf-lesson-content{order:1}.pdf-course-outline{order:2;width:100%}.course-card-navigation{grid-template-columns:56px minmax(0,1fr)}.course-card-navigation>:first-child{justify-content:center;padding-inline:10px}.course-card-navigation>:first-child span{display:none}.formula-line{grid-template-columns:56px minmax(0,1fr)}.formula-line-actions button{min-height:44px}.mobile-puzzle-drawer{width:min(370px,100vw - 24px);bottom:82px;right:12px}.mobile-puzzle-drawer[open]{width:min(430px,100vw - 24px);top:68px;bottom:82px;right:12px}}.pdf-course-page .course-goals{padding:0;display:block}.pdf-course-page .course-goals[open] ul{padding:15px 17px 17px}.pdf-course-page .guided-course-layout{grid-template-columns:minmax(0,1fr);gap:13px;display:grid}.pdf-course-page .course-map{max-height:none;position:static;overflow:visible}.pdf-course-page .course-concept-card{min-height:0}.pdf-course-page .course-card-content{padding:clamp(24px,3.5vw,38px)}.pdf-course-page .course-card-opening>h2{margin-bottom:12px;font-size:clamp(25px,3vw,35px);line-height:1.12}.pdf-course-page .course-card-body{max-width:66ch;margin-bottom:16px;font-size:17px;line-height:1.68}.pdf-course-page .course-formulas,.pdf-course-page .course-step-list,.pdf-course-page .course-table-wrap,.pdf-course-page .course-trap{margin-bottom:0}.pdf-course-page .course-step-list p,.pdf-course-page .course-trap p{font-size:14px;line-height:1.58}.pdf-course-page .learning-interactive-head span,.pdf-course-page .learning-range span,.pdf-course-page .learning-range-pair span,.pdf-course-page .learning-interactive>p,.pdf-course-page .learning-result{font-size:12px}@media (width<=760px){.pdf-course-page .course-learning-hero{padding-block:17px}.pdf-course-page .course-learning-hero>div>p{display:none}.pdf-course-page .guided-course-layout{grid-template-columns:minmax(0,1fr);display:grid}.pdf-course-page .course-map{order:2;width:100%}.pdf-course-page .pdf-lesson-content{order:1}.pdf-course-page .course-card-content{padding:22px 17px 25px}.pdf-course-page .course-card-body{font-size:16px}.pdf-course-page .course-card-navigation{bottom:calc(68px + env(safe-area-inset-bottom))}}@media (width<=520px){.pdf-course-page .course-card-rail{display:none}.pdf-course-page .course-concept-card{grid-template-columns:minmax(0,1fr)}.pdf-course-page .course-card-content{padding-inline:15px}}.course-viewer-page{width:100%;color:var(--ink)}.course-crumbs{min-width:0;color:var(--ink-faint);white-space:nowrap;align-items:center;gap:7px;margin-bottom:22px;font-size:11px;font-weight:650;display:flex}.course-crumbs a{transition:color .18s}.course-crumbs a:hover{color:var(--violet-600)}.course-crumbs span{color:var(--ink-soft);text-overflow:ellipsis;overflow:hidden}.course-eyebrow{color:var(--violet-600);letter-spacing:.1em;text-transform:uppercase;align-items:center;gap:7px;font-size:10px;font-weight:850;display:inline-flex}.theme-dark .course-eyebrow{color:var(--violet-400)}.course-home-hero{background:radial-gradient(circle at 83% 16%, #8b5cf638, transparent 27%), linear-gradient(135deg, var(--surface), var(--surface-violet));box-shadow:var(--shadow-md);border:1px solid #8b5cf629;border-radius:28px;grid-template-columns:minmax(0,1.45fr) minmax(280px,.55fr);align-items:center;gap:clamp(34px,6vw,88px);padding:clamp(34px,5vw,64px);display:grid;position:relative;overflow:hidden}.course-home-hero:after{content:"";pointer-events:none;border:1px solid #8b5cf629;border-radius:50%;width:260px;height:260px;position:absolute;top:-90px;right:-75px;box-shadow:0 0 0 38px #8b5cf609,0 0 0 76px #8b5cf606}.course-home-hero h1,.course-part-hero h1{letter-spacing:-.055em;margin:13px 0;font-size:clamp(35px,5vw,59px);line-height:1.03}.course-home-hero>div:first-child>p{max-width:700px;color:var(--ink-soft);margin:0;font-size:15px;line-height:1.7}.course-home-actions{flex-wrap:wrap;align-items:center;gap:16px;margin-top:26px;display:flex}.course-home-actions>span{color:var(--ink-faint);font-size:11px;font-weight:650}.course-home-summary{z-index:1;border:1px solid var(--line);background:var(--surface);border-radius:20px;gap:10px;padding:14px;display:grid;position:relative}@supports (color:color-mix(in lab, red, red)){.course-home-summary{background:color-mix(in srgb, var(--surface) 84%, transparent)}}.course-home-summary{-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}.course-home-summary span{min-height:54px;color:var(--ink-soft);background:var(--surface-soft);border-radius:13px;grid-template-columns:44px 1fr;align-items:center;gap:11px;padding:9px 12px;font-size:11px;font-weight:650;display:grid}.course-home-summary strong{color:var(--violet-600);letter-spacing:-.04em;font-size:23px}.theme-dark .course-home-summary strong{color:var(--violet-400)}.course-parts-section{margin-top:48px}.course-section-heading{justify-content:space-between;align-items:end;gap:24px;margin-bottom:21px;display:flex}.course-section-heading h2{letter-spacing:-.045em;margin:7px 0 0;font-size:clamp(25px,3vw,35px)}.course-section-heading>p{max-width:420px;color:var(--ink-soft);margin:0;font-size:12px;line-height:1.6}.course-part-grid,.course-card-list,.course-card-outline ol{padding:0;list-style:none}.course-part-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:13px;margin:0;display:grid}.course-part-card{border:1px solid var(--line);background:var(--surface);min-height:164px;box-shadow:var(--shadow-sm);border-radius:20px;grid-template-columns:56px minmax(0,1fr) 30px;align-items:start;gap:16px;padding:22px;transition:transform .2s,border-color .2s,box-shadow .2s;display:grid;position:relative}.course-part-card:hover{border-color:#7c3aed57;transform:translateY(-3px);box-shadow:0 18px 44px #2c1e551c}.course-part-number{width:52px;height:52px;color:var(--violet-700);background:var(--violet-100);border-radius:16px;place-items:center;font-size:16px;font-weight:900;display:grid}.theme-dark .course-part-number{color:#ddd2ff;background:#7c3aed38}.course-part-count{color:var(--ink-faint);letter-spacing:.08em;text-transform:uppercase;font-size:9px;font-weight:800}.course-part-card h3{letter-spacing:-.025em;margin:6px 0 15px;font-size:17px;line-height:1.28}.course-part-types{flex-wrap:wrap;gap:6px;display:flex}.course-part-progress{align-items:center;gap:8px;margin-top:14px;display:flex}.course-part-progress>span{background:var(--line);border-radius:999px;flex:1;height:5px;display:block;overflow:hidden}.course-part-progress i{border-radius:inherit;background:linear-gradient(90deg, var(--violet-600), var(--teal-500));height:100%;transition:width .3s;display:block}.course-part-progress strong{min-width:28px;color:var(--violet-600);text-align:right;font-size:9px}.course-part-arrow{color:var(--violet-600);align-self:center;transition:transform .18s}.course-part-card:hover .course-part-arrow{transform:translate(3px)}.course-type-badge{letter-spacing:.025em;white-space:nowrap;border-radius:999px;align-items:center;gap:5px;width:fit-content;padding:5px 8px;font-size:8px;font-weight:820;line-height:1;display:inline-flex}.course-type-badge.tone-violet{color:#6d28d9;background:#ede9fe}.course-type-badge.tone-blue{color:#3730a3;background:#e0e7ff}.course-type-badge.tone-teal{color:#0f766e;background:#ccfbf1}.course-type-badge.tone-amber{color:#a15806;background:#fef3c7}.course-type-badge.tone-coral{color:#be185d;background:#fce7f3}.course-type-badge.tone-slate{color:#565269;background:#eeedf3}.theme-dark .course-type-badge{filter:saturate(.8)brightness(.82)}.course-part-hero{border:1px solid var(--line);background:radial-gradient(circle at 90% 10%, #8b5cf629, transparent 30%), var(--surface);box-shadow:var(--shadow-sm);border-radius:24px;justify-content:space-between;align-items:end;gap:30px;margin-bottom:23px;padding:31px 34px;display:flex}.course-part-hero h1{margin-block:8px 9px;font-size:clamp(30px,4vw,45px)}.course-part-hero p{max-width:640px;color:var(--ink-soft);margin:0;font-size:13px;line-height:1.62}.course-part-switcher-shell{margin-bottom:18px;position:relative}.course-part-switcher{border:1px solid var(--line);background:var(--surface);scroll-behavior:smooth;scrollbar-width:none;scroll-snap-type:x proximity;border-radius:17px;gap:7px;margin:0;padding:6px 53px;display:flex;overflow-x:auto}.course-part-switcher::-webkit-scrollbar{display:none}.course-part-switcher a{min-width:0;min-height:58px;color:var(--ink-soft);scroll-snap-align:start;border-radius:12px;flex:0 0 clamp(230px,28vw,310px);align-items:center;gap:11px;padding:10px 13px;font-size:10px;font-weight:750;line-height:1.35;display:inline-flex}.course-part-switcher a .course-part-switcher-title{white-space:normal;min-width:0;display:block;overflow:hidden}.course-part-switcher-title .inline-math-text{text-overflow:ellipsis;display:block;overflow:hidden}.course-part-switcher-title small{color:var(--ink-faint);margin-top:4px;font-size:9px;font-weight:800;display:block}.course-part-switcher a.active .course-part-switcher-title small{color:#ffffffb8}.course-part-switcher a>span:first-child{width:26px;height:26px;color:var(--violet-700);background:var(--violet-100);border-radius:8px;flex:none;place-items:center;font-weight:900;display:grid}.course-part-switcher a.active{color:#fff;background:linear-gradient(135deg, var(--violet-600), #5b21b6)}.course-part-switcher a.active>span:first-child{color:#fff;background:#ffffff29}.course-part-scroll-button{z-index:3;border:1px solid var(--violet-600);place-items:center;width:38px;height:38px;display:grid;position:absolute;top:50%}@supports (color:color-mix(in lab, red, red)){.course-part-scroll-button{border:1px solid color-mix(in srgb, var(--violet-600) 24%, var(--line))}}.course-part-scroll-button{color:var(--violet-700);background:var(--surface);border-radius:12px}@supports (color:color-mix(in lab, red, red)){.course-part-scroll-button{background:color-mix(in srgb, var(--surface) 92%, transparent)}}.course-part-scroll-button{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);transition:opacity .18s,transform .18s,background .18s;transform:translateY(-50%);box-shadow:0 7px 20px #2c1e5526}.course-part-scroll-button.previous{left:9px}.course-part-scroll-button.next{right:9px}.course-part-scroll-button:hover:not(:disabled){color:#fff;background:var(--violet-600);transform:translateY(-50%)scale(1.04)}.course-part-scroll-button:disabled{opacity:.24;cursor:default;box-shadow:none}.course-card-list{gap:9px;margin:0;display:grid}.course-content-language{width:100%}.course-content-ar .course-reading-body,.course-content-ar .course-home-hero,.course-content-ar .course-part-hero{text-align:right}.course-content-ar .course-markdown ul,.course-content-ar .course-markdown ol{padding-left:0;padding-right:25px}.course-content-ar .course-markdown blockquote{border-right:4px solid var(--card-accent,var(--violet-600));border-left:0;border-radius:13px 4px 4px 13px}.course-content-ar .course-card-list-item{border-right:3px solid var(--card-accent);border-left:1px solid var(--line)}.course-content-ar .course-part-arrow,.course-content-ar .course-card-list-item>svg,.course-content-ar .course-part-sequence svg,.course-content-ar .course-card-nav svg{transform:scaleX(-1)}.course-empty-part{border:1px solid var(--line);background:var(--surface);border-radius:18px;align-items:flex-start;gap:14px;margin:0 0 20px;padding:20px 22px;display:flex}@supports (color:color-mix(in lab, red, red)){.course-empty-part{background:color-mix(in srgb, var(--surface) 92%, var(--violet-500))}}.course-empty-part-icon{width:42px;height:42px;color:var(--violet-700);background:var(--violet-500);border-radius:13px;flex:none;place-items:center;display:grid}@supports (color:color-mix(in lab, red, red)){.course-empty-part-icon{background:color-mix(in srgb, var(--violet-500) 14%, var(--surface))}}.course-empty-part h2{margin:0 0 5px;font-size:16px}.course-empty-part p{max-width:64ch;color:var(--ink-secondary);margin:0;line-height:1.6}.course-card-list-item{--card-accent:var(--violet-600);border:1px solid var(--line);border-left:3px solid var(--card-accent);background:var(--surface);border-radius:16px;grid-template-columns:44px 42px minmax(0,1fr) 24px;align-items:center;gap:13px;min-height:91px;padding:13px 18px;transition:transform .18s,border-color .18s,box-shadow .18s;display:grid;box-shadow:0 5px 18px #2c1e5509}.course-card-list-item:hover{border-color:var(--card-accent)}@supports (color:color-mix(in lab, red, red)){.course-card-list-item:hover{border-color:color-mix(in srgb, var(--card-accent) 35%, var(--line))}}.course-card-list-item:hover{box-shadow:var(--shadow-sm);transform:translate(3px)}.course-card-list-item.tone-teal{--card-accent:var(--teal-600)}.course-card-list-item.tone-blue{--card-accent:var(--blue-600)}.course-card-list-item.tone-amber{--card-accent:var(--amber-500)}.course-card-list-item.tone-coral{--card-accent:var(--coral-600)}.course-card-list-item.tone-slate{--card-accent:#777288}.course-card-order{color:var(--ink-faint);text-align:center;font-size:12px;font-weight:850}.course-card-list-icon{width:39px;height:39px;color:var(--card-accent);background:var(--surface-soft);border-radius:12px;place-items:center;display:grid}.course-card-list-copy{justify-items:start;gap:7px;display:grid}.course-card-list-copy strong{font-size:14px;line-height:1.25}.course-card-list-copy small{color:var(--ink-faint);font-size:9px}.course-card-list-item.viewed{border-color:var(--card-accent)}@supports (color:color-mix(in lab, red, red)){.course-card-list-item.viewed{border-color:color-mix(in srgb, var(--card-accent) 26%, var(--line))}}.course-card-list-item.viewed{background:var(--card-accent)}@supports (color:color-mix(in lab, red, red)){.course-card-list-item.viewed{background:color-mix(in srgb, var(--card-accent) 3%, var(--surface))}}.course-card-viewed{align-items:center;gap:4px;font-weight:800;display:inline-flex;color:var(--teal-600)!important}.course-inline-progress,.course-card-progress-label{color:var(--violet-600);font-weight:800}.course-card-progress-label{margin-left:7px}.course-card-list-item>svg{color:var(--ink-faint)}.course-part-sequence,.course-card-nav{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:20px;display:grid}.course-part-sequence>a,.course-card-nav>a{border:1px solid var(--line);min-width:0;min-height:70px;color:var(--ink-soft);background:var(--surface);border-radius:15px;align-items:center;gap:13px;padding:14px 17px;transition:border-color .18s,transform .18s;display:flex}.course-part-sequence>a:hover,.course-card-nav>a:hover{border-color:#7c3aed66;transform:translateY(-2px)}.course-part-sequence>a:last-child,.course-card-nav>a:last-child{text-align:right;justify-content:flex-end}.course-part-sequence span,.course-card-nav span{gap:4px;min-width:0;display:grid}.course-part-sequence small,.course-card-nav small{color:var(--ink-faint);letter-spacing:.05em;text-transform:uppercase;font-size:8px;font-weight:750}.course-part-sequence span:not(:empty),.course-card-nav strong{text-overflow:ellipsis;white-space:nowrap;font-size:11px;overflow:hidden}.course-card-part-jump{border:1px solid var(--line);background:var(--surface);border-radius:14px;justify-content:space-between;align-items:center;gap:13px;margin-bottom:13px;padding:10px 13px;display:flex}.course-card-part-jump>span{color:var(--ink-faint);letter-spacing:.09em;text-transform:uppercase;font-size:9px;font-weight:850}.course-card-part-jump>div{gap:6px;display:flex}.course-card-part-jump a{width:30px;height:30px;color:var(--ink-soft);background:var(--surface-soft);border-radius:9px;place-items:center;font-size:10px;font-weight:850;display:grid}.course-card-part-jump a.active{color:#fff;background:var(--violet-600);box-shadow:0 7px 16px #7c3aed3d}.course-card-layout{grid-template-columns:minmax(0,1fr) 276px;align-items:start;gap:16px;display:grid}.course-reading-card{--card-accent:var(--violet-600);border:1px solid var(--line);border-top:4px solid var(--card-accent);background:var(--surface);box-shadow:var(--shadow-md);border-radius:22px;overflow:hidden}.course-reading-card.tone-teal{--card-accent:var(--teal-600)}.course-reading-card.tone-blue{--card-accent:var(--blue-600)}.course-reading-card.tone-amber{--card-accent:var(--amber-500)}.course-reading-card.tone-coral{--card-accent:var(--coral-600)}.course-reading-card.tone-slate{--card-accent:#777288}.course-reading-header{border-bottom:1px solid var(--line);background:radial-gradient(circle at 95% 0%, var(--card-accent), transparent 31%), var(--surface);grid-template-columns:48px minmax(0,1fr);align-items:start;gap:16px;padding:clamp(24px,4vw,38px) clamp(20px,5vw,48px) 25px;display:grid}@supports (color:color-mix(in lab, red, red)){.course-reading-header{background:radial-gradient(circle at 95% 0%, color-mix(in srgb, var(--card-accent) 13%, transparent), transparent 31%), var(--surface)}}.course-reading-icon{width:47px;height:47px;color:var(--card-accent);background:var(--surface-soft);border-radius:15px;place-items:center;display:grid}.course-reading-meta{color:var(--ink-faint);flex-wrap:wrap;align-items:center;gap:9px;font-size:9px;font-weight:700;display:flex}.course-reading-header h1{letter-spacing:-.045em;max-width:760px;margin:11px 0 12px;font-size:clamp(27px,4vw,40px);line-height:1.08}.course-reading-header>div:last-child>p{flex-wrap:wrap;gap:7px;margin:0;display:flex}.course-reading-header>div:last-child>p span{color:var(--ink-faint);font-size:9px;font-weight:650}.course-prerequisites{border-bottom:1px solid var(--line);background:var(--surface-soft);flex-wrap:wrap;align-items:center;gap:7px;padding:13px clamp(20px,5vw,48px);display:flex}.course-prerequisites>span{color:var(--ink-faint);letter-spacing:.04em;text-transform:uppercase;font-size:9px;font-weight:800}.course-prerequisites a{border:1px solid var(--line);color:var(--violet-700);background:var(--surface);border-radius:999px;padding:5px 9px;font-size:9px;font-weight:750}.theme-dark .course-prerequisites a{color:var(--violet-400)}.course-reading-body{max-width:850px;min-height:310px;padding:clamp(27px,5vw,50px) clamp(20px,6vw,62px)}.course-markdown{max-width:70ch;color:var(--ink);font-size:16px;line-height:1.78}.course-markdown+.course-markdown,.course-markdown+.course-graph,.course-graph+.course-markdown,.course-geogebra+.course-markdown{margin-top:27px}.course-markdown>:first-child{margin-top:0}.course-markdown>:last-child{margin-bottom:0}.course-markdown h2,.course-markdown h3,.course-markdown h4{letter-spacing:-.025em;margin:1.5em 0 .55em;line-height:1.25}.course-markdown h2{font-size:24px}.course-markdown h3{font-size:20px}.course-markdown h4{font-size:17px}.course-markdown p{margin:0 0 1.15em}.course-markdown strong{color:var(--ink);font-weight:800}.course-markdown ul,.course-markdown ol{gap:8px;margin:0 0 1.3em;padding-left:25px;display:grid}.course-markdown li::marker{color:var(--card-accent,var(--violet-600));font-weight:850}.course-markdown blockquote{border-left:4px solid var(--card-accent,var(--violet-600));color:var(--ink-soft);background:var(--surface-soft);border-radius:4px 13px 13px 4px;grid-template-columns:24px minmax(0,1fr);gap:10px;margin:22px 0;padding:17px 19px;display:grid}.course-markdown blockquote>svg{color:var(--card-accent,var(--violet-600));margin-top:4px}.course-markdown blockquote p:last-child{margin-bottom:0}.course-markdown a{color:var(--violet-600);text-underline-offset:3px;font-weight:700;-webkit-text-decoration:underline #7c3aed4d;text-decoration:underline #7c3aed4d}.course-markdown :not(pre)>code{color:var(--violet-700);background:var(--violet-50);border-radius:5px;padding:2px 5px;font-size:.9em}.course-markdown pre{box-sizing:border-box;border:1px solid var(--line);max-width:100%;color:var(--ink-soft);background:var(--surface-soft);white-space:pre-wrap;overflow-wrap:anywhere;word-break:break-word;scrollbar-width:thin;border-radius:12px;margin:1.2em 0 1.35em;padding:14px 16px;overflow-x:auto}.course-markdown pre code{max-width:100%;font:inherit;white-space:inherit;line-height:1.55;display:block}.course-markdown .katex-display{box-sizing:border-box;border:1px solid var(--card-accent,var(--violet-600));width:100%;max-width:100%;margin:1.7em 0 1.85em;padding:14px 18px 16px;overflow:auto hidden}@supports (color:color-mix(in lab, red, red)){.course-markdown .katex-display{border:1px solid color-mix(in srgb, var(--card-accent,var(--violet-600)) 12%, var(--line))}}.course-markdown .katex-display{background:var(--surface-soft);border-radius:13px}@supports (color:color-mix(in lab, red, red)){.course-markdown .katex-display{background:color-mix(in srgb, var(--surface-soft) 76%, transparent)}}.course-markdown .katex-display{caret-color:#0000;overscroll-behavior-x:contain;scrollbar-color:var(--card-accent,var(--violet-600)) transparent}@supports (color:color-mix(in lab, red, red)){.course-markdown .katex-display{scrollbar-color:color-mix(in srgb, var(--card-accent,var(--violet-600)) 34%, transparent) transparent}}.course-markdown .katex-display{scrollbar-width:thin;-webkit-overflow-scrolling:touch}.course-markdown .katex-display>.katex{white-space:nowrap;min-width:max-content;padding:2px 8px;line-height:1.42;display:inline-block}.course-markdown .katex{caret-color:#0000;font-size:1.11em}.course-markdown p>.katex,.course-markdown li>.katex{margin-inline:.08em}.course-markdown .katex-display::-webkit-scrollbar{height:7px}.course-markdown .katex-display::-webkit-scrollbar-thumb{background:var(--card-accent,var(--violet-600));border-radius:999px}@supports (color:color-mix(in lab, red, red)){.course-markdown .katex-display::-webkit-scrollbar-thumb{background:color-mix(in srgb, var(--card-accent,var(--violet-600)) 32%, transparent)}}.course-table-scroll{border:1px solid var(--line);border-radius:14px;margin:21px 0;overflow-x:auto}.course-table-scroll table{border-collapse:collapse;width:100%;min-width:540px;font-size:13px}.course-table-scroll th,.course-table-scroll td{border-right:1px solid var(--line);border-bottom:1px solid var(--line);text-align:center;padding:12px 13px}.course-table-scroll th{color:var(--ink);background:var(--surface-soft);font-weight:800}.course-table-scroll tr:last-child td{border-bottom:0}.course-table-scroll th:last-child,.course-table-scroll td:last-child{border-right:0}.course-card-outline{border:1px solid var(--line);background:var(--surface);max-height:calc(100vh - 102px);box-shadow:var(--shadow-sm);border-radius:18px;position:sticky;top:82px;overflow:hidden}.course-outline-heading{border-bottom:1px solid var(--line);gap:5px;padding:16px 17px;display:grid}.course-outline-heading span{color:var(--ink-faint);letter-spacing:.08em;text-transform:uppercase;font-size:8px;font-weight:850}.course-outline-heading strong{font-size:12px;line-height:1.35}.course-card-outline ol{scrollbar-width:thin;max-height:calc(100vh - 235px);margin:0;padding:8px;overflow-y:auto}.course-card-outline li+li{margin-top:3px}.course-card-outline li a{min-height:45px;color:var(--ink-soft);border-radius:10px;grid-template-columns:25px minmax(0,1fr);align-items:center;gap:8px;padding:7px 8px;display:grid}.course-card-outline li a:hover{background:var(--surface-soft)}.course-card-outline li a.active{color:var(--violet-700);background:var(--violet-50)}.theme-dark .course-card-outline li a.active{color:#d8ccff;background:#7c3aed2e}.course-card-outline li a>span{width:24px;height:24px;color:var(--ink-faint);background:var(--surface-soft);border-radius:8px;place-items:center;font-size:8px;font-weight:850;display:grid}.course-card-outline li a.active>span{color:#fff;background:var(--violet-600)}.course-card-outline li strong{text-overflow:ellipsis;white-space:nowrap;font-size:9px;line-height:1.25;overflow:hidden}.course-outline-back{border-top:1px solid var(--line);min-height:43px;color:var(--violet-600);background:var(--surface-soft);justify-content:center;align-items:center;gap:7px;font-size:9px;font-weight:800;display:flex}.course-reading-card .course-card-nav{border-top:1px solid var(--line);background:var(--surface-soft);margin:0;padding:18px clamp(20px,5vw,48px) 25px}.course-reading-card .course-card-nav>a{background:var(--surface)}.course-graph,.course-geogebra{border:1px solid var(--line);background:#fff;border-radius:18px;max-width:100%;margin:27px 0 0;overflow:hidden;box-shadow:0 10px 30px #2c1e5514}.course-graph-toolbar{color:#625d75;background:#faf9fd;border-bottom:1px solid #ebe9f2;justify-content:space-between;align-items:center;gap:12px;padding:10px 12px;display:flex}.course-graph-toolbar>span{letter-spacing:.07em;text-transform:uppercase;font-size:9px;font-weight:850}.course-graph-toolbar>div{gap:6px;display:flex}.course-graph-toolbar button,.course-embed-error button,.course-embed-error a{color:#504b64;cursor:pointer;background:#fff;border:1px solid #e2dfeb;border-radius:9px;align-items:center;gap:6px;min-height:31px;padding:0 9px;font-size:9px;font-weight:750;display:inline-flex}.course-graph-board{background:#fff;width:100%;height:clamp(320px,48vw,460px);border:0!important}.course-graph figcaption,.course-geogebra figcaption{color:#504b64;background:#fff;padding:11px 15px 4px;font-size:11px;font-weight:700;line-height:1.5}.course-graph-hint{color:#8a849a;background:#fff;margin:0;padding:3px 15px 12px;font-size:9px}.course-physics-visual{background:radial-gradient(circle at 12% 0,#7c3aed1a,#0000 32%),#fff}.course-physics-intro{gap:5px;padding:17px 18px 12px;display:grid}.course-physics-intro strong{color:#21183f;font-size:clamp(14px,2vw,18px)}.course-physics-intro p{color:#625d75;max-width:72ch;margin:0;font-size:11px;line-height:1.6}.course-physics-stage{background:#fff;border-block:1px solid #eeeaf6;width:100%;min-height:320px;overflow:hidden}.course-physics-stage canvas{max-width:100%;display:block}.course-physics-controls{color:#625d75;background:#fff;grid-template-columns:auto minmax(120px,1fr) 42px;align-items:center;gap:11px;padding:11px 15px 8px;font-size:10px;font-weight:750;display:grid}.course-physics-controls input{accent-color:#7c3aed;cursor:ew-resize;width:100%}.course-physics-controls span{color:#7c3aed;text-align:right}.course-counting-visual{background:radial-gradient(circle at 8% 5%,#7c3aed14,#0000 28%),#fff}.course-counting-head{gap:5px;padding:18px 18px 12px;display:grid}.course-counting-head>strong{color:#241b45;font-size:16px}.course-counting-head p{color:#6f6882;margin:0;font-size:12px;line-height:1.6}.course-counting-levels{grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:8px;padding:0 18px 14px;display:grid}.course-counting-levels>span{color:#9a94aa;background:#faf9fdb3;border:1px dashed #ddd7eb;border-radius:11px;gap:2px;padding:9px 11px;font-size:11px;font-weight:700;display:grid}.course-counting-levels>span.is-visible{color:#5b21b6;background:#f6f1ff;border-style:solid;border-color:#d6c5ff}.course-counting-levels small{color:#918aa2;letter-spacing:.05em;text-transform:uppercase;font-size:8px}.course-counting-paths{grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:9px;padding:0 18px 16px;display:grid}.course-counting-paths>button{color:#3e3657;text-align:left;cursor:pointer;background:#ffffffe0;border:1px solid #e6e1ef;border-radius:13px;justify-content:space-between;align-items:center;gap:10px;min-width:0;min-height:67px;padding:10px;transition:border-color .16s,background .16s,transform .16s;display:flex}.course-counting-paths>button:hover,.course-counting-paths>button.is-selected{background:#faf7ff;border-color:#a78bfa;transform:translateY(-1px)}.course-counting-branch{align-items:center;gap:6px;min-width:0;display:flex}.course-counting-node{color:#5b21b6;background:#eee7ff;border-radius:10px;place-items:center;gap:1px;min-width:43px;padding:6px 8px;display:grid;position:relative}.course-counting-node+.course-counting-node:before{content:"→";color:#aaa1bd;position:absolute;left:-14px}.course-counting-node small,.course-counting-outcome small{color:#81798f;white-space:nowrap;font-size:8px}.pdf-problem-formulas .inline-math-text,.pdf-problem-formulas .katex{font-size:1.04em}.pdf-problem-formulas .katex{line-height:1.65}.course-counting-pending{color:#9b94aa;font-size:18px}.course-counting-outcome{color:#0f766e;flex:none;justify-items:end;gap:2px;display:grid}.course-counting-actions{color:#5b21b6;justify-content:center;align-items:center;min-height:48px;padding:0 18px 14px;font-size:12px;display:flex}.course-counting-actions button{color:#fff;cursor:pointer;background:linear-gradient(135deg,#7c3aed,#5b21b6);border:0;border-radius:11px;min-height:38px;padding:0 15px;font-size:11px;font-weight:800}.course-venn-stage{width:min(420px,100% - 36px);height:210px;margin:4px auto 12px;position:relative}.course-venn-instruction{color:#6d647e;text-align:center;margin:0 18px 8px;font-size:11px;font-weight:650;line-height:1.5}.course-venn-circle{border:3px solid;border-radius:50%;width:190px;height:190px;position:absolute;top:15px}.course-venn-circle.is-left{left:40px}.course-venn-circle.is-right{right:40px}.course-venn-circle strong{font-size:18px;position:absolute;top:18px}.course-venn-circle.is-left strong{left:35px}.course-venn-circle.is-right strong{right:35px}.course-venn-region-button{z-index:3;color:#241b45;cursor:pointer;background:#fffffff5;border:1px solid #d9d0e9;border-radius:14px;place-items:center;gap:1px;width:76px;min-height:62px;padding:7px 5px;transition:all .16s;display:grid;position:absolute;top:87px;box-shadow:0 5px 14px #36265d14}.course-venn-region-button strong{font-size:17px;font-weight:900}.course-venn-region-button span{color:#746c84;font-size:9px;font-weight:700}.course-venn-region-button.is-left{left:73px}.course-venn-region-button.is-intersection{left:calc(50% - 38px)}.course-venn-region-button.is-right{right:73px}.course-venn-region-button.is-selected{color:#fff;background:#6d28d9;border-color:#7c3aed;transform:translateY(-3px);box-shadow:0 8px 20px #6d28d93d}.course-venn-region-button.is-selected span{color:#ede9fe}.course-venn-controls{flex-wrap:wrap;justify-content:center;gap:7px;padding:0 18px 10px;display:flex}.course-venn-controls button{color:#5d566f;cursor:pointer;background:#fff;border:1px solid #ded7ea;border-radius:10px;min-height:34px;padding:0 11px;font-size:10px;font-weight:750}.course-venn-controls button.is-selected{color:#5b21b6;background:#f5f0ff;border-color:#a78bfa}.course-venn-reading{color:#5f5871;text-align:center;background:#faf9fd;border-radius:11px;justify-items:center;gap:4px;min-height:47px;margin:0 18px 8px;padding:11px 14px;font-size:10px;line-height:1.45;display:grid}.course-venn-reading strong{color:#4c1d95;font-size:11px}.course-venn-summary{color:#625a74;background:#fff;border:1px solid #e8e1f3;border-radius:12px;gap:5px;margin:0 18px 10px;padding:11px 14px;font-size:10px;display:grid}.course-venn-summary span:last-child{color:#5b21b6}@media (width<=560px){.course-venn-stage{height:184px}.course-venn-circle{width:164px;height:164px}.course-venn-circle.is-left{left:22px}.course-venn-circle.is-right{right:22px}.course-venn-region-button{width:60px;top:74px}.course-venn-region-button.is-left{left:50px}.course-venn-region-button.is-intersection{left:calc(50% - 30px)}.course-venn-region-button.is-right{right:50px}}.course-graph-error,.course-embed-error,.course-embed-status{color:#625d75;text-align:center;place-content:center;justify-items:center;gap:10px;min-height:190px;padding:25px;display:grid}.course-graph-error span{font-size:11px}.course-graph.is-expanded{z-index:120;border-radius:20px;grid-template-rows:auto minmax(0,1fr) auto auto;margin:0;display:grid;position:fixed;inset:18px;box-shadow:0 24px 90px #0d08286b}.course-graph.is-expanded .course-graph-board{height:100%;min-height:0}.course-geogebra-stage{background:#fff;width:100%}.course-embed-status{pointer-events:none;margin-top:-100%}.course-embed-error{flex-wrap:wrap;min-height:120px;display:flex}.course-embed-error strong{width:100%}.course-missing-view{min-height:470px;color:var(--ink-soft);text-align:center;place-content:center;justify-items:center;padding:40px;display:grid}.course-missing-view>svg{color:var(--violet-600)}.course-missing-view h1{color:var(--ink);letter-spacing:-.04em;margin:17px 0 7px;font-size:30px}.course-missing-view p{max-width:470px;margin:0 0 22px;font-size:13px;line-height:1.6}@media (width<=1020px){.course-home-hero{grid-template-columns:1fr}.course-home-summary{grid-template-columns:repeat(3,minmax(0,1fr))}.course-home-summary span{grid-template-columns:1fr;gap:3px}.course-card-layout{grid-template-columns:minmax(0,1fr)}.course-card-outline{max-height:none;position:static}.course-card-outline ol{grid-template-columns:repeat(2,minmax(0,1fr));max-height:none;display:grid;overflow:visible}}@media (width<=760px){.course-crumbs{margin-bottom:15px;padding-bottom:4px;overflow-x:auto}.course-home-hero{border-radius:21px;gap:26px;padding:27px 21px}.course-home-hero h1{font-size:38px}.course-home-summary{grid-template-columns:1fr}.course-home-summary span{grid-template-columns:44px 1fr}.course-section-heading,.course-part-hero{flex-direction:column;align-items:flex-start}.course-section-heading>p{max-width:none}.course-part-grid{grid-template-columns:1fr}.course-part-card{min-height:145px;padding:18px}.course-part-hero{padding:24px 21px}.course-part-hero .button{width:100%}.course-part-switcher{padding-inline:49px}.course-part-switcher a{flex-basis:min(276px,100vw - 128px)}.course-card-list-item{grid-template-columns:34px 38px minmax(0,1fr) 18px;gap:9px;padding-inline:11px}.course-reading-header{grid-template-columns:40px minmax(0,1fr);gap:12px}.course-reading-icon{width:40px;height:40px}.course-reading-body{min-height:240px}.course-markdown{font-size:15.5px;line-height:1.72}.course-card-outline ol,.course-card-nav,.course-part-sequence{grid-template-columns:1fr}.course-card-nav>span,.course-part-sequence>span{display:none}.course-graph-toolbar button{color:#0000;width:32px;padding:0 8px;overflow:hidden}.course-graph-toolbar button svg{color:#504b64;flex:none}.course-graph-board{height:330px}.course-physics-intro{padding-inline:14px}.course-physics-stage{min-height:320px}.course-graph.is-expanded{inset:8px}}@media (width<=480px){.course-part-card{grid-template-columns:46px minmax(0,1fr) 20px;gap:12px}.course-part-number{border-radius:13px;width:44px;height:44px}.course-part-types .course-type-badge:nth-child(n+3),.course-card-list-icon{display:none}.course-card-list-item{grid-template-columns:31px minmax(0,1fr) 17px}.course-card-part-jump{flex-direction:column;align-items:flex-start}.course-card-part-jump>div{justify-content:space-between;width:100%}.course-reading-header{grid-template-columns:1fr}.course-reading-icon{display:none}.course-reading-header h1{font-size:28px}.course-reading-card .course-card-nav{padding-inline:13px}.course-card-nav strong{max-width:210px}}.rtl .continue-card,[dir=rtl] .continue-card{background:radial-gradient(circle at 14% 27%,#8b5cf6a6,#0000 27%),linear-gradient(225deg,#150941,#3b147d)}.rtl .continue-decoration,[dir=rtl] .continue-decoration{left:23px!important;right:auto!important}.rtl .continue-decoration span,[dir=rtl] .continue-decoration span{left:12px!important;right:auto!important}.rtl .continue-decoration em,[dir=rtl] .continue-decoration em{transform:rotate(8deg);left:20px!important;right:auto!important}.rtl .continue-decoration i,[dir=rtl] .continue-decoration i{transform:skewY(12deg);left:22px!important;right:auto!important}.rtl .practice-feature,[dir=rtl] .practice-feature{background:radial-gradient(circle at 20% 35%,#5eead42e,#0000 28%),linear-gradient(225deg,#150a42,#3a1976)}.rtl .practice-orbit,[dir=rtl] .practice-orbit{left:9%!important;right:auto!important}.rtl .exam-feature,[dir=rtl] .exam-feature{background:radial-gradient(circle at 15% 20%, #f43f781a, transparent 27%), var(--surface);grid-template-columns:.75fr 1.25fr}.rtl .exam-paper,[dir=rtl] .exam-paper{transform:rotate(-3deg)}.rtl .practice-feature>div:first-child,[dir=rtl] .practice-feature>div:first-child,.rtl .continue-card h2,[dir=rtl] .continue-card h2,.rtl .continue-card>p,[dir=rtl] .continue-card>p{text-align:right}.inline-math-text{display:inline}.inline-math-text .katex{color:inherit;font-size:1em}.inline-math-text .katex-display{margin:0;display:inline}.qcm-subject-title p{max-width:620px;color:var(--ink-soft);margin:8px 0 0;font-size:12px;line-height:1.6}.qcm-subject-grid{margin:20px 0 38px}.qcm-subject-card{width:100%;color:var(--ink);font:inherit;text-align:left;cursor:pointer;transition:transform .2s,box-shadow .2s,border-color .2s}.qcm-subject-card:not(:disabled):hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.qcm-subject-card-selected{border-color:var(--violet-400);background:var(--violet-50);box-shadow:0 0 0 3px var(--violet-400)}@supports (color:color-mix(in lab, red, red)){.qcm-subject-card-selected{box-shadow:0 0 0 3px color-mix(in srgb, var(--violet-400) 14%, transparent)}}.theme-dark .qcm-subject-card-selected{background:var(--violet-600)}@supports (color:color-mix(in lab, red, red)){.theme-dark .qcm-subject-card-selected{background:color-mix(in srgb, var(--violet-600) 12%, var(--surface))}}.qcm-subject-card:disabled{cursor:not-allowed}.rtl .qcm-subject-card,[dir=rtl] .qcm-subject-card{text-align:right}.qcm-subject-results{scroll-margin-top:90px}.qcm-catalog-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px;margin-top:24px;margin-bottom:48px;display:grid}.qcm-catalog-card{background:var(--surface);border:1px solid var(--line);border-radius:20px;flex-direction:column;padding:24px;transition:transform .2s,box-shadow .2s,border-color .2s;display:flex;box-shadow:0 4px 12px #00000005}.qcm-catalog-card:hover{border-color:#7c3aed33;transform:translateY(-2px);box-shadow:0 12px 24px #0000000d}.qcm-catalog-card-disabled{opacity:.7;pointer-events:none}.qcm-catalog-card-header{justify-content:space-between;align-items:center;margin-bottom:16px;display:flex}.qcm-catalog-card h3{color:var(--ink);margin:0 0 16px;font-size:18px;line-height:1.3}.qcm-catalog-facts{flex-wrap:wrap;gap:16px;margin-bottom:24px;display:flex}.qcm-catalog-facts>span{color:var(--ink-faint);align-items:center;gap:8px;display:flex}.qcm-catalog-facts div{flex-direction:column;display:flex}.qcm-catalog-facts small{text-transform:uppercase;letter-spacing:.05em;font-size:11px;font-weight:600}.qcm-catalog-facts strong{color:var(--ink);font-size:14px}.quiz-mode-selection{max-width:820px;margin:40px auto}.quiz-mode-heading{text-align:center;max-width:650px;margin:0 auto 28px}.quiz-mode-heading h1{color:var(--ink);margin:8px 0 24px;font-size:clamp(25px,4vw,34px)}.quiz-mode-heading h2{color:var(--ink);margin:8px 0 10px;font-size:clamp(21px,3vw,28px)}.quiz-mode-heading p{color:var(--ink-soft);margin:0;line-height:1.65}.quiz-mode-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;display:grid}.quiz-mode-card{border:1px solid var(--line);min-height:300px;color:var(--ink);background:var(--surface);box-shadow:var(--shadow-sm);text-align:left;cursor:pointer;border-radius:20px;flex-direction:column;align-items:flex-start;padding:28px;transition:transform .2s,border-color .2s,box-shadow .2s;display:flex}.quiz-mode-card:hover{border-color:var(--violet-400);box-shadow:var(--shadow-md);transform:translateY(-3px)}.quiz-mode-card-selected{border-color:var(--violet-600);box-shadow:0 0 0 3px var(--violet-100), var(--shadow-md);transform:translateY(-3px)}.quiz-mode-icon{width:54px;height:54px;color:var(--violet-700);background:var(--violet-100);border-radius:16px;place-items:center;margin-bottom:22px;display:grid}.quiz-mode-card>strong{margin-bottom:10px;font-size:19px}.quiz-mode-card>p{color:var(--ink-soft);flex:1;margin:0 0 24px;font-size:14px;line-height:1.65}.quiz-mode-card>.button{pointer-events:none;width:100%}[dir=rtl] .quiz-mode-card{text-align:right;align-items:flex-start}.quiz-mode-preference-card{border:1px solid var(--line);background:var(--surface);max-width:620px;box-shadow:var(--shadow-sm);border-radius:18px;margin:22px auto 0;padding:22px}.quiz-mode-preference-card>strong{color:var(--ink);margin-bottom:14px;display:block}.quiz-mode-preference-card label{cursor:pointer;border-radius:12px;align-items:flex-start;gap:12px;padding:12px;display:flex}.quiz-mode-preference-card label:hover{background:var(--violet-100)}.quiz-mode-preference-card input{accent-color:var(--violet-600);margin-top:4px}.quiz-mode-preference-card label span,.quiz-mode-preference-card label small{display:block}.quiz-mode-preference-card label b{color:var(--ink)}.quiz-mode-preference-card label small,.quiz-mode-preference-card>p{color:var(--ink-soft);line-height:1.5}.quiz-mode-preference-card>p{margin:12px 0 16px;font-size:13px}.quiz-ready{text-align:center;max-width:600px;margin:40px auto}.quiz-back-link{color:var(--ink-soft);align-items:center;gap:8px;margin-bottom:32px;font-size:14px;font-weight:600;text-decoration:none;display:inline-flex}.quiz-back-link:hover{color:var(--violet-600)}.quiz-ready-hero{margin-bottom:40px}.quiz-ready-icon{background:var(--violet-100);width:80px;height:80px;color:var(--violet-600);border-radius:24px;justify-content:center;align-items:center;margin-bottom:24px;display:inline-flex}.quiz-ready-hero h1{color:var(--ink);margin:8px 0 16px;font-size:32px}.quiz-ready-hero p{color:var(--ink-soft);font-size:16px;line-height:1.6}.quiz-ready-facts{justify-content:center;gap:32px;margin-top:24px;display:flex}.quiz-ready-facts>div{background:var(--surface-alt);color:var(--ink);border-radius:100px;align-items:center;gap:8px;padding:12px 20px;font-size:15px;display:flex}.quiz-rules-card{background:var(--surface);border:1px solid var(--line);text-align:left;border-radius:16px;margin-bottom:32px;padding:24px}[dir=rtl] .quiz-rules-card{text-align:right}.quiz-rules-card h3{color:var(--ink);margin:0 0 16px;font-size:16px}.quiz-rules-card ul{gap:12px;margin:0;padding:0;list-style:none;display:grid}.quiz-rules-card li{color:var(--ink-soft);padding-left:24px;font-size:15px;position:relative}[dir=rtl] .quiz-rules-card li{padding-left:0;padding-right:24px}.quiz-rules-card li:before{content:"•";color:var(--violet-500);font-weight:700;position:absolute;left:0}[dir=rtl] .quiz-rules-card li:before{left:auto;right:0}.quiz-workspace{max-width:1000px;margin:0 auto;padding:24px 0}.quiz-workspace-header{justify-content:space-between;align-items:center;margin-bottom:24px;display:flex}.quiz-workspace-title{flex-direction:column;display:flex}.quiz-question-counter{color:var(--ink);font-size:24px;font-weight:800}.quiz-timer{background:var(--surface);border:1px solid var(--line);color:var(--ink);border-radius:100px;align-items:center;gap:8px;padding:8px 16px;font-family:monospace;font-size:18px;font-weight:700;display:flex;box-shadow:0 2px 8px #0000000d}.quiz-timer-warning{color:var(--coral-600);background:var(--coral-100);border-color:#f43f784d;animation:1s infinite pulse}.quiz-mode-badge{border:1px solid var(--violet-300);min-height:42px;color:var(--violet-800);background:var(--violet-100);border-radius:999px;align-items:center;gap:8px;padding:0 15px;font-size:13px;font-weight:750;display:inline-flex}@keyframes pulse{50%{opacity:.5}}.quiz-progress-bar{background:var(--line);border-radius:3px;height:6px;margin-bottom:32px;overflow:hidden}.quiz-progress-fill{background:var(--violet-500);height:100%;transition:width .3s}.quiz-workspace-grid{grid-template-columns:1fr 280px;gap:32px;display:grid}@media (width<=900px){.quiz-mode-grid,.quiz-workspace-grid{grid-template-columns:1fr}.quiz-navigator{order:-1}}.quiz-question-panel{flex-direction:column;display:flex}.quiz-question-text{color:var(--ink);margin-bottom:32px;font-size:20px;line-height:1.6}.quiz-math-text{min-width:0}.quiz-math-text .katex{caret-color:#0000;max-width:100%;font-size:1.08em}.quiz-question-text .quiz-math-text .katex,.quiz-correction-question .quiz-math-text .katex{font-size:1.12em}.quiz-math-text .katex-display{box-sizing:border-box;border:1px solid var(--violet-600);max-width:100%;margin:1em 0;padding:10px 12px;overflow:auto hidden}@supports (color:color-mix(in lab, red, red)){.quiz-math-text .katex-display{border:1px solid color-mix(in srgb, var(--violet-600) 12%, var(--line))}}.quiz-math-text .katex-display{background:var(--surface-soft);border-radius:11px}@supports (color:color-mix(in lab, red, red)){.quiz-math-text .katex-display{background:color-mix(in srgb, var(--surface-soft) 76%, transparent)}}.quiz-math-text .katex-display{scrollbar-width:thin}.quiz-math-text .katex-display>.katex{white-space:nowrap;min-width:max-content;padding:2px 6px;line-height:1.42;display:inline-block}.quiz-options{gap:16px;margin-bottom:40px;display:grid}.quiz-option{background:var(--surface);border:2px solid var(--line);cursor:pointer;text-align:left;border-radius:16px;align-items:center;gap:16px;padding:16px 20px;transition:all .2s;display:flex}[dir=rtl] .quiz-option{text-align:right}.quiz-option:hover{border-color:var(--violet-300);background:var(--violet-100)}.quiz-option-selected{border-color:var(--violet-500);background:var(--violet-100);box-shadow:0 4px 12px #7c3aed26}.quiz-option-key{background:var(--line);width:32px;height:32px;color:var(--ink-soft);border-radius:8px;justify-content:center;align-items:center;font-size:14px;font-weight:700;display:flex}.quiz-option-selected .quiz-option-key{background:var(--violet-500);color:#fff}.quiz-option:disabled{cursor:default;opacity:1}.quiz-option-correct,.quiz-option-correct:hover{border-color:var(--green-500);background:var(--green-100);box-shadow:0 4px 12px var(--green-500)}@supports (color:color-mix(in lab, red, red)){.quiz-option-correct,.quiz-option-correct:hover{box-shadow:0 4px 12px color-mix(in srgb, var(--green-500) 14%, transparent)}}.quiz-option-correct .quiz-option-key{color:#fff;background:var(--green-600)}.quiz-option-incorrect,.quiz-option-incorrect:hover{border-color:var(--coral-600);background:var(--coral-100);box-shadow:0 4px 12px var(--coral-600)}@supports (color:color-mix(in lab, red, red)){.quiz-option-incorrect,.quiz-option-incorrect:hover{box-shadow:0 4px 12px color-mix(in srgb, var(--coral-600) 12%, transparent)}}.quiz-option-incorrect .quiz-option-key{color:#fff;background:var(--coral-600)}.quiz-immediate-feedback{border:1px solid var(--line);background:var(--surface);border-radius:16px;gap:16px;margin:-16px 0 32px;padding:20px;display:grid}.quiz-immediate-feedback-correct{border-color:var(--green-500)}@supports (color:color-mix(in lab, red, red)){.quiz-immediate-feedback-correct{border-color:color-mix(in srgb, var(--green-500) 36%, var(--line))}}.quiz-immediate-feedback-incorrect{border-color:var(--coral-600)}@supports (color:color-mix(in lab, red, red)){.quiz-immediate-feedback-incorrect{border-color:color-mix(in srgb, var(--coral-600) 34%, var(--line))}}.quiz-immediate-feedback-title,.quiz-immediate-correct-answer{align-items:center;gap:9px;display:flex}.quiz-immediate-feedback-correct .quiz-immediate-feedback-title{color:var(--green-700)}.quiz-immediate-feedback-incorrect .quiz-immediate-feedback-title{color:var(--coral-700)}.quiz-immediate-correct-answer{color:var(--ink-soft);background:var(--green-100);border-radius:11px;flex-wrap:wrap;padding:12px 14px}.quiz-immediate-correct-answer b{color:var(--green-700)}.quiz-immediate-explanation{border-top:1px solid var(--line);color:var(--ink);padding-top:15px;line-height:1.65}.quiz-immediate-explanation>strong{color:var(--violet-700);letter-spacing:.05em;text-transform:uppercase;margin-bottom:7px;font-size:12px;display:block}.quiz-option-text{color:var(--ink);flex:1;font-size:16px;line-height:1.5}.quiz-nav-buttons{justify-content:space-between;margin-top:auto;display:flex}.quiz-navigator{background:var(--surface);border:1px solid var(--line);border-radius:20px;flex-direction:column;padding:24px;display:flex}.quiz-navigator strong{color:var(--ink);margin-bottom:16px;font-size:16px}.quiz-navigator-grid{grid-template-columns:repeat(5,1fr);gap:10px;margin-bottom:24px;display:grid}.quiz-nav-dot{aspect-ratio:1;border:1px solid var(--line);color:var(--ink-soft);cursor:pointer;background:0 0;border-radius:8px;justify-content:center;align-items:center;font-size:14px;font-weight:600;transition:all .2s;display:flex}.quiz-nav-dot:hover{border-color:var(--violet-400)}.quiz-nav-dot-answered{background:var(--violet-100);border-color:var(--violet-300);color:var(--violet-800)}.quiz-nav-dot-current{border-color:var(--violet-500);color:var(--violet-700);border-width:2px;box-shadow:0 0 0 3px #7c3aed33}.quiz-navigator-legend{color:var(--ink-soft);gap:16px;margin-bottom:24px;font-size:13px;display:flex}.quiz-navigator-legend span{align-items:center;gap:6px;display:flex}.quiz-navigator-legend i{border-radius:3px;width:12px;height:12px}.dot-answered{background:var(--violet-100);border:1px solid var(--violet-300)}.dot-current{border:2px solid var(--violet-500)}.quiz-navigator-summary{border-top:1px solid var(--line);text-align:center;color:var(--ink);margin-bottom:16px;padding-top:24px;font-size:18px;font-weight:700}.quiz-results{max-width:800px;margin:0 auto;padding:40px 0}.quiz-score-hero{border-radius:24px;align-items:center;gap:40px;margin-bottom:32px;padding:40px;display:flex}.quiz-score-passed{background:var(--green-100);color:var(--green-900)}.quiz-score-failed{background:var(--coral-100);color:var(--coral-900)}.quiz-score-ring{width:140px;height:140px;position:relative}.quiz-score-svg{width:100%;height:100%;transform:rotate(-90deg)}.quiz-score-bg{fill:none;stroke:#0000001a;stroke-width:8px}.quiz-score-fg{fill:none;stroke:currentColor;stroke-width:8px;stroke-linecap:round;transition:stroke-dashoffset 1s ease-out}.quiz-score-value{flex-direction:column;justify-content:center;align-items:center;display:flex;position:absolute;inset:0}.quiz-score-value strong{font-size:42px;font-weight:900;line-height:1}.quiz-score-value span{opacity:.7;font-size:16px;font-weight:700}.quiz-score-info h1{margin:0 0 8px;font-size:32px}.quiz-score-course{opacity:.8;margin-bottom:16px;font-size:18px}.quiz-score-message{margin-bottom:24px;font-size:18px;font-weight:600}.quiz-score-stats{gap:24px;display:flex}.quiz-score-stats span{align-items:center;gap:8px;font-size:15px;font-weight:600;display:flex}.quiz-result-actions{justify-content:center;gap:16px;margin-bottom:48px;display:flex}.quiz-correction{background:var(--surface);border:1px solid var(--line);border-radius:24px;padding:32px}.quiz-correction h2{color:var(--ink);margin-bottom:32px;font-size:24px}.quiz-correction-list{gap:24px;margin:0;padding:0;list-style:none;display:grid}.quiz-correction-item{border:1px solid var(--line);background:var(--surface-alt);border-radius:16px;padding:24px}.quiz-correction-correct{border-color:#22c55e4d;box-shadow:0 4px 12px #22c55e0d}.quiz-correction-incorrect{border-color:#f43f784d;box-shadow:0 4px 12px #f43f780d}.quiz-correction-header{margin-bottom:16px}.quiz-correction-number{align-items:center;gap:8px;font-size:15px;font-weight:700;display:inline-flex}.quiz-correction-correct .quiz-correction-number{color:var(--green-600)}.quiz-correction-incorrect .quiz-correction-number{color:var(--coral-600)}.quiz-correction-question{color:var(--ink);margin-bottom:24px;font-size:18px;line-height:1.5}.quiz-correction-answers{flex-direction:column;gap:12px;margin-bottom:24px;display:flex}.quiz-correction-user-answer,.quiz-correction-correct-answer{background:var(--surface);border:1px solid var(--line);border-radius:12px;align-items:center;gap:16px;padding:12px 16px;display:flex}.quiz-answer-label{text-transform:uppercase;border-radius:6px;padding:4px 8px;font-size:12px;font-weight:700}.quiz-answer-label.incorrect{background:var(--coral-100);color:var(--coral-700)}.quiz-answer-label.correct{background:var(--green-100);color:var(--green-700)}.quiz-answer-label.correct-alt{background:var(--surface-alt);color:var(--ink-soft)}.quiz-answer-key{font-size:16px;font-weight:800}.quiz-answer-key.correct{color:var(--green-600)}.quiz-correction-explanation{border-top:1px solid var(--line);color:var(--ink);padding-top:24px;line-height:1.6}.quiz-correction-explanation strong{color:var(--violet-600);text-transform:uppercase;letter-spacing:.05em;margin-bottom:8px;font-size:14px;display:block}.testez-vous-cta{background:linear-gradient(135deg, var(--violet-100), var(--violet-200));border:1px solid var(--violet-300);border-radius:24px;margin-top:48px;padding:32px}.testez-vous-content{align-items:center;gap:24px;display:flex}.testez-vous-icon{width:64px;height:64px;color:var(--violet-600);background:#fff;border-radius:20px;justify-content:center;align-items:center;display:flex;box-shadow:0 8px 16px #7c3aed26}.testez-vous-content h3{color:var(--ink);margin:0 0 8px;font-size:24px}.testez-vous-content p{color:var(--ink-soft);margin:0;font-size:16px}.testez-vous-content .button{margin-left:auto}[dir=rtl] .testez-vous-content .button{margin-left:0;margin-right:auto}@media (width<=768px){.testez-vous-content{text-align:center;flex-direction:column}.testez-vous-content .button{width:100%;margin:16px auto 0}}.quiz-card-nav-link{background:var(--violet-100);border-color:var(--violet-300)}.quiz-card-nav-link:hover{background:var(--violet-200)}.quiz-card-nav-link *{color:var(--violet-800)!important}@media (width<=680px){.progress-subject-grid{grid-template-columns:1fr}.course-card-progress-label{width:100%;margin-left:0}}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}