@import"https://fonts.googleapis.com/css2?family=Archivo:wght@400;600;800&display=swap";@font-face{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-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-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-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-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-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-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-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-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-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-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-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-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-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-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-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-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-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-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-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{font: 1.21em KaTeX_Main,Times New Roman,serif;line-height:1.2;text-indent:0;text-rendering:auto}.katex *{-ms-high-contrast-adjust:none!important;border-color:currentColor}.katex .katex-version:after{content:"0.16.11"}.katex .katex-mathml{clip:rect(1px,1px,1px,1px);border:0;height:1px;overflow:hidden;padding:0;position:absolute;width:1px}.katex .katex-html>.newline{display:block}.katex .base{position:relative;white-space:nowrap;width:-webkit-min-content;width:-moz-min-content;width:min-content}.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 .textitsf{font-family:KaTeX_SansSerif;font-style:italic}.katex .mainrm{font-family:KaTeX_Main;font-style:normal}.katex .vlist-t{border-collapse:collapse;display:inline-table;table-layout:fixed}.katex .vlist-r{display:table-row}.katex .vlist{display:table-cell;position:relative;vertical-align:bottom}.katex .vlist>span{display:block;height:0;position:relative}.katex .vlist>span>span{display:inline-block}.katex .vlist>span>.pstrut{overflow:hidden;width:0}.katex .vlist-t2{margin-right:-2px}.katex .vlist-s{display:table-cell;font-size:1px;min-width:2px;vertical-align:bottom;width:2px}.katex .vbox{align-items:baseline;display:inline-flex;flex-direction:column}.katex .hbox{width:100%}.katex .hbox,.katex .thinbox{display:inline-flex;flex-direction:row}.katex .thinbox{max-width:0;width:0}.katex .msupsub{text-align:left}.katex .mfrac>span>span{text-align:center}.katex .mfrac .frac-line{border-bottom-style:solid;display:inline-block;width:100%}.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 .clap,.katex .llap,.katex .rlap{position:relative;width:0}.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;display:inline-block;width:100%}.katex .hdashline{border-bottom-style:dashed;display:inline-block;width:100%}.katex .sqrt>.root{margin-left:.2777777778em;margin-right:-.5555555556em}.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:.8333333333em}.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:1.1666666667em}.katex .fontsize-ensurer.reset-size2.size4,.katex .sizing.reset-size2.size4{font-size:1.3333333333em}.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:1.6666666667em}.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:3.4566666667em}.katex .fontsize-ensurer.reset-size2.size11,.katex .sizing.reset-size2.size11{font-size:4.1466666667em}.katex .fontsize-ensurer.reset-size3.size1,.katex .sizing.reset-size3.size1{font-size:.7142857143em}.katex .fontsize-ensurer.reset-size3.size2,.katex .sizing.reset-size3.size2{font-size:.8571428571em}.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:1.1428571429em}.katex .fontsize-ensurer.reset-size3.size5,.katex .sizing.reset-size3.size5{font-size:1.2857142857em}.katex .fontsize-ensurer.reset-size3.size6,.katex .sizing.reset-size3.size6{font-size:1.4285714286em}.katex .fontsize-ensurer.reset-size3.size7,.katex .sizing.reset-size3.size7{font-size:1.7142857143em}.katex .fontsize-ensurer.reset-size3.size8,.katex .sizing.reset-size3.size8{font-size:2.0571428571em}.katex .fontsize-ensurer.reset-size3.size9,.katex .sizing.reset-size3.size9{font-size:2.4685714286em}.katex .fontsize-ensurer.reset-size3.size10,.katex .sizing.reset-size3.size10{font-size:2.9628571429em}.katex .fontsize-ensurer.reset-size3.size11,.katex .sizing.reset-size3.size11{font-size:3.5542857143em}.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:.5555555556em}.katex .fontsize-ensurer.reset-size5.size2,.katex .sizing.reset-size5.size2{font-size:.6666666667em}.katex .fontsize-ensurer.reset-size5.size3,.katex .sizing.reset-size5.size3{font-size:.7777777778em}.katex .fontsize-ensurer.reset-size5.size4,.katex .sizing.reset-size5.size4{font-size:.8888888889em}.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:1.1111111111em}.katex .fontsize-ensurer.reset-size5.size7,.katex .sizing.reset-size5.size7{font-size:1.3333333333em}.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:2.3044444444em}.katex .fontsize-ensurer.reset-size5.size11,.katex .sizing.reset-size5.size11{font-size:2.7644444444em}.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:.4166666667em}.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:.5833333333em}.katex .fontsize-ensurer.reset-size7.size4,.katex .sizing.reset-size7.size4{font-size:.6666666667em}.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:.8333333333em}.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:1.7283333333em}.katex .fontsize-ensurer.reset-size7.size11,.katex .sizing.reset-size7.size11{font-size:2.0733333333em}.katex .fontsize-ensurer.reset-size8.size1,.katex .sizing.reset-size8.size1{font-size:.3472222222em}.katex .fontsize-ensurer.reset-size8.size2,.katex .sizing.reset-size8.size2{font-size:.4166666667em}.katex .fontsize-ensurer.reset-size8.size3,.katex .sizing.reset-size8.size3{font-size:.4861111111em}.katex .fontsize-ensurer.reset-size8.size4,.katex .sizing.reset-size8.size4{font-size:.5555555556em}.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:.6944444444em}.katex .fontsize-ensurer.reset-size8.size7,.katex .sizing.reset-size8.size7{font-size:.8333333333em}.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:1.4402777778em}.katex .fontsize-ensurer.reset-size8.size11,.katex .sizing.reset-size8.size11{font-size:1.7277777778em}.katex .fontsize-ensurer.reset-size9.size1,.katex .sizing.reset-size9.size1{font-size:.2893518519em}.katex .fontsize-ensurer.reset-size9.size2,.katex .sizing.reset-size9.size2{font-size:.3472222222em}.katex .fontsize-ensurer.reset-size9.size3,.katex .sizing.reset-size9.size3{font-size:.4050925926em}.katex .fontsize-ensurer.reset-size9.size4,.katex .sizing.reset-size9.size4{font-size:.462962963em}.katex .fontsize-ensurer.reset-size9.size5,.katex .sizing.reset-size9.size5{font-size:.5208333333em}.katex .fontsize-ensurer.reset-size9.size6,.katex .sizing.reset-size9.size6{font-size:.5787037037em}.katex .fontsize-ensurer.reset-size9.size7,.katex .sizing.reset-size9.size7{font-size:.6944444444em}.katex .fontsize-ensurer.reset-size9.size8,.katex .sizing.reset-size9.size8{font-size:.8333333333em}.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:1.2002314815em}.katex .fontsize-ensurer.reset-size9.size11,.katex .sizing.reset-size9.size11{font-size:1.4398148148em}.katex .fontsize-ensurer.reset-size10.size1,.katex .sizing.reset-size10.size1{font-size:.2410800386em}.katex .fontsize-ensurer.reset-size10.size2,.katex .sizing.reset-size10.size2{font-size:.2892960463em}.katex .fontsize-ensurer.reset-size10.size3,.katex .sizing.reset-size10.size3{font-size:.337512054em}.katex .fontsize-ensurer.reset-size10.size4,.katex .sizing.reset-size10.size4{font-size:.3857280617em}.katex .fontsize-ensurer.reset-size10.size5,.katex .sizing.reset-size10.size5{font-size:.4339440694em}.katex .fontsize-ensurer.reset-size10.size6,.katex .sizing.reset-size10.size6{font-size:.4821600771em}.katex .fontsize-ensurer.reset-size10.size7,.katex .sizing.reset-size10.size7{font-size:.5785920926em}.katex .fontsize-ensurer.reset-size10.size8,.katex .sizing.reset-size10.size8{font-size:.6943105111em}.katex .fontsize-ensurer.reset-size10.size9,.katex .sizing.reset-size10.size9{font-size:.8331726133em}.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:1.1996142719em}.katex .fontsize-ensurer.reset-size11.size1,.katex .sizing.reset-size11.size1{font-size:.2009646302em}.katex .fontsize-ensurer.reset-size11.size2,.katex .sizing.reset-size11.size2{font-size:.2411575563em}.katex .fontsize-ensurer.reset-size11.size3,.katex .sizing.reset-size11.size3{font-size:.2813504823em}.katex .fontsize-ensurer.reset-size11.size4,.katex .sizing.reset-size11.size4{font-size:.3215434084em}.katex .fontsize-ensurer.reset-size11.size5,.katex .sizing.reset-size11.size5{font-size:.3617363344em}.katex .fontsize-ensurer.reset-size11.size6,.katex .sizing.reset-size11.size6{font-size:.4019292605em}.katex .fontsize-ensurer.reset-size11.size7,.katex .sizing.reset-size11.size7{font-size:.4823151125em}.katex .fontsize-ensurer.reset-size11.size8,.katex .sizing.reset-size11.size8{font-size:.578778135em}.katex .fontsize-ensurer.reset-size11.size9,.katex .sizing.reset-size11.size9{font-size:.6945337621em}.katex .fontsize-ensurer.reset-size11.size10,.katex .sizing.reset-size11.size10{font-size:.8336012862em}.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{display:inline-block;width:.12em}.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{display:inline-block;min-width:1px}.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;fill-rule:nonzero;fill-opacity:1;stroke-width:1;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;display:block;height:inherit;position:absolute;width:100%}.katex svg path{stroke:none}.katex img{border-style:none;max-height:none;max-width:none;min-height:0;min-width:0}.katex .stretchy{display:block;overflow:hidden;position:relative;width:100%}.katex .stretchy:after,.katex .stretchy:before{content:""}.katex .hide-tail{overflow:hidden;position:relative;width:100%}.katex .halfarrow-left{left:0;overflow:hidden;position:absolute;width:50.2%}.katex .halfarrow-right{overflow:hidden;position:absolute;right:0;width:50.2%}.katex .brace-left{left:0;overflow:hidden;position:absolute;width:25.1%}.katex .brace-center{left:25%;overflow:hidden;position:absolute;width:50%}.katex .brace-right{overflow:hidden;position:absolute;right:0;width:25.1%}.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{border:.04em solid;box-sizing:border-box}.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{border-right:.049em solid;border-top:.049em solid;box-sizing:border-box;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{display:inline-block;position:absolute;right:calc(50% + .3em);text-align:left}.katex .cd-label-right{display:inline-block;left:calc(50% + .3em);position:absolute;text-align:right}.katex-display{display:block;margin:1em 0;text-align:center}.katex-display>.katex{display:block;text-align:center;white-space:nowrap}.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{padding-left:2em;text-align:left}body{counter-reset:katexEqnNo mmlEqnNo}:root{--color-bg: #f3f2f2;--color-surface: #eae9e9;--color-text: #201e1d;--color-accent: #ec3013;--color-accent-2: #e15b47;--color-divider: color-mix(in srgb, #201e1d 40%, transparent);--color-neutral-100: #f8f4f4;--color-neutral-200: #eae7e7;--color-neutral-300: #d7d3d3;--color-neutral-400: #bab6b6;--color-neutral-500: #9b9797;--color-neutral-600: #7d7979;--color-neutral-700: #605d5d;--color-neutral-800: #444141;--color-neutral-900: #2d2b2b;--color-accent-100: #fff2ef;--color-accent-200: #ffe0d9;--color-accent-300: #ffc4b8;--color-accent-400: #ff9783;--color-accent-500: #ff563c;--color-accent-600: #dd2b0f;--color-accent-700: #ae1800;--color-accent-800: #7c1405;--color-accent-900: #4d170e;--color-accent-2-100: #fff2ef;--color-accent-2-200: #ffe0da;--color-accent-2-300: #ffc4b9;--color-accent-2-400: #ff9784;--color-accent-2-500: #ef6853;--color-accent-2-600: #c94b39;--color-accent-2-700: #9e3526;--color-accent-2-800: #71261b;--color-accent-2-900: #471d16;--font-heading: "Archivo", system-ui, sans-serif;--font-heading-weight: 800;--font-body: "Archivo", system-ui, sans-serif;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-6: 24px;--space-8: 32px;--radius-sm: 0px;--radius-md: 0px;--radius-lg: 0px;--shadow-sm: 0 1px 2px color-mix(in srgb, #2d2b2b 14%, transparent);--shadow-md: 0 3px 10px color-mix(in srgb, #2d2b2b 16%, transparent);--shadow-lg: 0 12px 32px color-mix(in srgb, #2d2b2b 22%, transparent)}body{background:var(--color-bg);color:var(--color-text);font-family:var(--font-body)}h1,h2,h3,h4{font-family:var(--font-heading);font-weight:var(--font-heading-weight)}.grayscale{filter:grayscale(1) contrast(1.08)}*,*:before,*:after{box-sizing:border-box}body{margin:0;font-size:15px;line-height:1.55;font-weight:400}h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);font-weight:var(--font-heading-weight);line-height:1.12;letter-spacing:-.015em;margin:0 0 var(--space-2)}h1{font-size:42px}h2{font-size:32px}h3{font-size:25px}h4{font-size:20px}h5{font-size:16px}h6{font-size:13px}h6{letter-spacing:.08em;text-transform:uppercase}p{margin:0 0 var(--space-3)}a{color:var(--color-accent);text-underline-offset:3px}img{display:block;max-width:100%}figure{margin:0}figcaption{font-size:11px;margin-top:var(--space-1);color:color-mix(in srgb,var(--color-text) 55%,transparent)}.text-muted{color:color-mix(in srgb,var(--color-text) 55%,transparent)}:focus{outline:none}:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}::selection{background:color-mix(in srgb,var(--color-accent) 30%,transparent)}.hr{height:2px;border:0;margin:var(--space-4) 0;background:var(--color-divider)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;cursor:pointer;text-decoration:none;font-family:var(--font-heading);font-weight:var(--font-heading-weight);font-size:14px;line-height:1.2;color:var(--color-text);background:transparent;border:1px solid transparent;padding:var(--space-2) calc(var(--space-3) * 1.2);border-radius:var(--radius-md)}.btn svg{display:block}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-primary{background:var(--color-accent);color:var(--color-bg)}.btn-primary:hover{background:var(--color-accent-600)}.btn-primary:active{background:var(--color-accent-700)}.btn-secondary{border-color:var(--color-divider)}.btn-secondary:hover{background:color-mix(in srgb,var(--color-text) 7%,transparent)}.btn-secondary:active{background:color-mix(in srgb,var(--color-text) 14%,transparent)}.btn-ghost{color:var(--color-accent);padding-inline:var(--space-1)}.btn-ghost:hover{background:color-mix(in srgb,var(--color-accent) 10%,transparent)}.btn-ghost:active{background:color-mix(in srgb,var(--color-accent) 18%,transparent)}.btn-icon{width:36px;height:36px;padding:0}.btn-block{width:100%;margin-top:var(--space-2);justify-content:flex-start;text-align:left}.field>label{display:block;font-size:12px;margin-bottom:5px;color:color-mix(in srgb,var(--color-text) 70%,transparent)}.input{width:100%;min-height:36px;padding:6px 10px;font:inherit;font-size:14px;color:var(--color-text);caret-color:var(--color-accent);background:var(--color-surface);border:1px solid var(--color-divider);border-radius:var(--radius-md)}.input:hover{border-color:color-mix(in srgb,var(--color-text) 45%,transparent)}.input:focus-visible{border-color:var(--color-accent);outline-offset:0}textarea.input{min-height:90px;resize:vertical}.radio{display:inline-flex;align-items:center;gap:8px;cursor:pointer;font-size:14px}.radio input,.seg-opt input{position:absolute;opacity:0;width:0;height:0;pointer-events:none}.radio .dot{width:16px;height:16px;flex:none;border-radius:50%;border:1.5px solid var(--color-divider)}.radio:hover .dot{border-color:var(--color-accent)}.radio input:checked+.dot{border-color:var(--color-accent);background:var(--color-accent);box-shadow:inset 0 0 0 4px var(--color-bg)}.radio input:focus-visible+.dot{outline:2px solid var(--color-accent);outline-offset:2px}.seg{display:inline-flex;overflow:hidden;border:1px solid var(--color-divider);border-radius:var(--radius-md)}.seg-opt{display:inline-flex;align-items:center;gap:6px;padding:7px 12px;font-size:13px;cursor:pointer}.seg-opt+.seg-opt{border-left:1px solid var(--color-divider)}.seg-opt:has(input:checked){background:var(--color-accent);color:var(--color-bg)}.seg-opt:not(:has(input:checked)):hover{background:color-mix(in srgb,var(--color-text) 7%,transparent)}.seg-opt:has(input:focus-visible){outline:2px solid var(--color-accent);outline-offset:-2px}.card{display:flex;flex-direction:column;gap:var(--space-2);padding:var(--space-3);border-radius:var(--radius-md);background:var(--color-surface)}.card-kicker{font-size:10px;letter-spacing:.1em;text-transform:uppercase;color:var(--color-accent)}.card-title{font-family:var(--font-heading);font-weight:var(--font-heading-weight);font-size:17px;line-height:1.2}.card-body{margin:0;font-size:13px;opacity:.8;flex:1}.card-meta{display:flex;align-items:center;gap:6px;font-size:11px;color:color-mix(in srgb,var(--color-text) 50%,transparent)}.elev-sm{box-shadow:var(--shadow-sm)}.elev-md{box-shadow:var(--shadow-md)}.elev-lg{box-shadow:var(--shadow-lg)}.tag{display:inline-flex;align-items:center;font-size:11px;letter-spacing:.02em;padding:3px 10px;border-radius:calc(var(--radius-md) * .75)}.tag-accent{background:var(--color-accent-100);color:var(--color-accent-800)}.tag-accent-2{background:var(--color-accent-2-100);color:var(--color-accent-2-800)}.tag-neutral{background:var(--color-neutral-100);color:var(--color-neutral-800)}.tag-outline{border:1px solid var(--color-accent);color:var(--color-accent)}.nav{display:flex;align-items:center;gap:var(--space-4);padding:var(--space-3) var(--space-4);border-bottom:2px solid var(--color-divider)}.nav-brand{font-family:var(--font-heading);font-weight:var(--font-heading-weight);font-size:18px;margin-right:auto}.nav a{color:inherit;text-decoration:none;font-size:14px}.nav a:hover,.nav a[aria-current=page]{color:var(--color-accent)}.table{width:100%;border-collapse:collapse;font-size:14px}.table th{text-align:left;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:color-mix(in srgb,var(--color-text) 60%,transparent);padding:var(--space-2);border-bottom:2px solid var(--color-divider)}.table td{padding:var(--space-2);border-bottom:1px solid var(--color-divider)}.table tbody tr:hover{background:color-mix(in srgb,var(--color-text) 4%,transparent)}.dialog-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;display:grid;place-items:center;padding:var(--space-4);background:color-mix(in srgb,var(--color-neutral-900) 50%,transparent)}.dialog{width:min(440px,100%);display:flex;flex-direction:column;gap:var(--space-3);padding:var(--space-4);border-radius:var(--radius-lg);background:var(--color-surface);box-shadow:var(--shadow-lg)}.dialog-title{font-family:var(--font-heading);font-weight:var(--font-heading-weight);font-size:20px}.dialog-body{font-size:14px;opacity:.85}.dialog-actions{display:flex;justify-content:flex-end;gap:var(--space-2);margin-top:var(--space-2)}@media (prefers-color-scheme: dark){:root:not([data-theme=light]){--color-bg: #161514;--color-surface: #232120;--color-text: #f0eeed;--color-accent: #ff563c;--color-divider: color-mix(in srgb, #f0eeed 32%, transparent);--color-neutral-100: #2d2b2b;--color-neutral-200: #444141;--color-neutral-300: #605d5d;--color-neutral-400: #7d7979;--color-neutral-600: #bab6b6;--color-neutral-700: #d7d3d3;--color-neutral-800: #eae7e7;--color-neutral-900: #f8f4f4;--color-accent-100: #4d170e;--color-accent-200: #7c1405;--color-accent-300: #ae1800;--color-accent-400: #dd2b0f;--color-accent-600: #ff9783;--color-accent-700: #ffc4b8;--color-accent-800: #ffe0d9;--color-accent-900: #fff2ef;color-scheme:dark}}:root[data-theme=dark]{--color-bg: #161514;--color-surface: #232120;--color-text: #f0eeed;--color-accent: #ff563c;--color-divider: color-mix(in srgb, #f0eeed 32%, transparent);--color-neutral-100: #2d2b2b;--color-neutral-200: #444141;--color-neutral-300: #605d5d;--color-neutral-400: #7d7979;--color-neutral-600: #bab6b6;--color-neutral-700: #d7d3d3;--color-neutral-800: #eae7e7;--color-neutral-900: #f8f4f4;--color-accent-100: #4d170e;--color-accent-200: #7c1405;--color-accent-300: #ae1800;--color-accent-400: #dd2b0f;--color-accent-600: #ff9783;--color-accent-700: #ffc4b8;--color-accent-800: #ffe0d9;--color-accent-900: #fff2ef;color-scheme:dark}:root[data-theme=light]{color-scheme:light}body{background:var(--color-bg);color:var(--color-text);-webkit-text-size-adjust:100%}a{color:var(--color-accent-700)}a:hover{color:var(--color-accent)}.md{min-width:0;overflow-wrap:anywhere}.md p{margin:0 0 12px}.md p:last-child{margin-bottom:0}.md ul,.md ol{margin:0 0 12px;padding-left:22px}.md li{margin:4px 0}.md strong{font-weight:600}.md h1,.md h2,.md h3{font-size:20px;margin:16px 0 8px}.md h4,.md h5,.md h6{font-size:16px;letter-spacing:0;text-transform:none;margin:14px 0 6px}.md .katex-display{overflow-x:auto;overflow-y:hidden;margin:12px 0;padding:6px 0;-webkit-overflow-scrolling:touch}.md .katex{font-size:1.08em}.app{min-height:100vh;display:flex;flex-direction:column;font-family:var(--font-body)}.app-nav{position:sticky;top:0;z-index:10;background:var(--color-bg);padding:10px 20px;gap:8px}.brand{background:none;border:0;padding:8px 0;color:inherit;cursor:pointer;text-align:left;display:flex;align-items:center;gap:10px;min-height:44px}.brand-mark{width:22px;height:22px;display:block;flex:none}.icon-44{width:44px;height:44px}.signout{min-height:44px;padding:0 10px;font-weight:600}.main{width:100%;max-width:760px;margin:0 auto;padding:28px 20px 96px;display:flex;flex-direction:column;gap:28px}.stack{display:flex;flex-direction:column}.gap-6{gap:6px}.gap-8{gap:8px}.gap-10{gap:10px}.gap-12{gap:12px}.gap-14{gap:14px}.gap-16{gap:16px}.gap-20{gap:20px}.gap-24{gap:24px}.row{display:flex;gap:12px;flex-wrap:wrap}.start{align-self:flex-start}.m0{margin:0}.h1{margin:0;font-size:clamp(32px,8vw,42px)}.h1-sm{margin:0;font-size:clamp(30px,7vw,40px)}.kicker{margin:0;color:var(--color-accent-700)}.num{font-weight:800;font-size:15px;color:var(--color-accent-700)}.muted-14{font-size:14px}.lede{margin:0;font-size:16px}.reading{font-size:16px;line-height:1.65}.rule-top{border-top:2px solid var(--color-divider)}.section-foot{border-top:2px solid var(--color-divider);padding-top:24px}.btn.lg{min-height:52px;padding:12px 20px;font-size:16px;justify-content:flex-start}.btn.xl{min-height:56px;padding:14px 22px;font-size:17px;justify-content:flex-start;min-width:240px}.btn.md{min-height:52px;padding:12px 18px;font-size:15px;justify-content:flex-start}.btn.sm{min-height:44px;padding:10px 16px}.btn-back{align-self:flex-start;min-height:44px;font-weight:600;padding:0 6px 0 0;gap:6px}.tag.strong{font-weight:600}.nowrap{white-space:nowrap}.field-lg{min-height:52px;font-size:17px}.field-md{min-height:48px;font-size:16px}.list-row{all:unset;box-sizing:border-box;width:100%;cursor:pointer;display:grid;align-items:center}.list-row:hover{background:color-mix(in srgb,var(--color-text) 5%,transparent)}.list-row:focus-visible{outline:2px solid var(--color-accent);outline-offset:-2px}.course-row{grid-template-columns:minmax(0,1fr) auto;gap:6px 16px;padding:20px 4px;border-bottom:2px solid var(--color-divider);min-height:72px}.course-name{font-family:var(--font-heading);font-weight:800;font-size:20px;line-height:1.2}.course-chev{grid-row:span 2}.progress-line{display:flex;align-items:center;gap:12px;min-width:0}.bar{flex:1;max-width:220px;height:4px;background:var(--color-neutral-300);display:block}.bar>span{display:block;height:4px;background:var(--color-accent)}.olist{list-style:none;margin:0;padding:0;border-top:2px solid var(--color-divider)}.olist>li{border-bottom:1px solid var(--color-divider)}.topic-row{grid-template-columns:36px minmax(0,1fr) auto;gap:12px;padding:14px 4px;min-height:64px}.topic-title{font-size:16px;font-weight:600;line-height:1.3}.add-row{display:grid;grid-template-columns:36px minmax(0,1fr) auto;gap:12px;align-items:center;padding:10px 0;min-height:56px}.icon-btn-hover:hover{background:color-mix(in srgb,var(--color-text) 7%,transparent)}.past-row{grid-template-columns:minmax(0,1fr) auto;gap:12px;padding:12px 4px;border-bottom:1px solid var(--color-divider);min-height:56px}.ellipsis{font-size:15px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.topic-controls{display:flex;flex-wrap:wrap;gap:12px;align-items:stretch}.seg-diff{flex:1 1 280px;max-width:360px}.seg-diff .seg-opt{flex:1;justify-content:flex-start;padding:12px 16px;font-size:15px;min-height:52px}.get-q{flex:1 1 200px;max-width:320px}.stem{font-size:18px;font-weight:500;line-height:1.65;padding:20px;background:var(--color-surface);border-top:2px solid var(--color-text)}.part-head{display:grid;grid-template-columns:36px minmax(0,1fr);gap:4px;font-size:18px;font-weight:500;line-height:1.6;align-items:baseline}.part-label{font-weight:800}.seg-mode .seg-opt{padding:10px 16px;font-size:15px;min-height:44px}.answer-text{font-size:16px;line-height:1.5;padding:12px 14px;resize:vertical;font-family:var(--font-body)}.preview{display:flex;flex-direction:column;gap:6px;padding:12px 14px;background:var(--color-surface);border-left:2px solid var(--color-divider)}.preview-label{font-size:12px;letter-spacing:.08em;text-transform:uppercase}.photo-pick{display:flex;flex-direction:column;gap:12px;padding:18px 16px;border:2px dashed var(--color-divider);background:var(--color-surface)}.photo-pick-title{font-family:var(--font-heading);font-weight:800;font-size:17px}.photo-btn{position:relative;gap:8px;cursor:pointer}.photo-btn input{position:absolute;opacity:0;width:1px;height:1px;pointer-events:none}.photo-btn:focus-within{outline:2px solid var(--color-accent);outline-offset:2px}.photo-preview{width:100%;height:min(380px,70vw);object-fit:contain;background:var(--color-surface);border:2px solid var(--color-divider)}.photo-submitted{width:100%;height:min(360px,70vw);object-fit:contain;border:2px solid var(--color-divider)}.btn.type-toggle{padding-left:0;padding-right:0;color:var(--color-accent-700);text-decoration:underline;text-underline-offset:3px}.btn-link{background:none;border:0;padding:4px 0;font:inherit;color:var(--color-accent-700);text-decoration:underline;text-underline-offset:3px;cursor:pointer}.btn-link:hover{color:var(--color-accent)}.feedback{border-top:2px solid var(--color-text);padding-top:16px}details>summary.work-summary{cursor:pointer;min-height:44px;display:flex;align-items:center;font-weight:600}.chat{border-top:2px solid var(--color-divider);padding-top:20px}.msg-user{align-self:flex-end;max-width:85%;padding:12px 14px;background:var(--color-text);color:var(--color-bg);font-size:15px;white-space:pre-wrap;line-height:1.5}.msg-ai{max-width:100%;padding:2px 0 2px 14px;border-left:2px solid var(--color-accent);font-size:16px;line-height:1.65;min-width:0}.chat-input{display:flex;gap:8px;align-items:stretch}.chat-input textarea{flex:1;min-height:52px;font-size:16px;padding:12px;resize:none}.send{min-height:52px;min-width:52px;padding:0 16px;justify-content:flex-start}.exam-top{display:flex;justify-content:space-between;align-items:center;gap:12px}.steps{display:flex;gap:4px}.step{all:unset;cursor:pointer;flex:1;height:20px;display:flex;align-items:center}.step:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.step>span{display:block;width:100%;height:4px;background:var(--color-neutral-300)}.step.done>span{background:var(--color-accent)}.step.current>span{background:var(--color-text)}.step.problem>span{background:var(--c-ref)}.exam-title{margin:6px 0 0;font-size:clamp(24px,6vw,30px)}.exam-actions{border-top:2px solid var(--color-divider);padding-top:20px}.exam-actions .btn-primary{flex:1 1 220px;max-width:320px;min-width:0}.score-row{display:flex;align-items:baseline;gap:16px;flex-wrap:wrap;border-top:2px solid var(--color-text);padding-top:16px}.big-score{font-family:var(--font-heading);font-weight:800;font-size:clamp(56px,16vw,88px);line-height:1;letter-spacing:-.03em}.pct{font-size:18px;font-weight:600}.table-wrap{overflow-x:auto}.table td{padding:12px 8px}.r{text-align:right}.lost{font-weight:800}.lost.pos{color:var(--color-accent-700)}.res-item{border-top:1px solid var(--color-divider)}.res-item>summary{cursor:pointer;list-style:none;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px;align-items:center;padding:14px 4px;min-height:56px}.res-item>summary::-webkit-details-marker{display:none}.res-q{font-size:15px;line-height:1.6;padding:14px;background:var(--color-surface)}.res-fb{font-size:15px;line-height:1.6;padding-left:14px;border-left:2px solid var(--color-accent)}.error{display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px;padding:10px 14px;border-left:2px solid var(--color-accent);background:var(--color-accent-100);color:var(--color-accent-800);font-size:15px}.error .btn{min-height:44px;font-weight:600}.viz{margin:12px 0;color:var(--color-text)}.viz svg{display:block;width:100%;height:auto;max-width:600px;overflow:visible}.viz svg text{fill:currentColor;font-family:var(--font-body)}.viz svg [stroke]:not([stroke=none]){stroke:currentColor}.viz svg [fill]:not([fill=none]){fill:currentColor}.viz svg [fill=white],.viz svg [fill="#fff"],.viz svg [fill="#ffffff"],.viz svg [fill="#FFFFFF"]{fill:var(--color-bg)}.viz svg .accent,.viz svg .accent[stroke]{stroke:var(--color-accent)}.viz svg .accent[fill]:not([fill=none]),.viz svg text.accent,.viz svg .accent-fill{fill:var(--color-accent)}.plot .grid{stroke:color-mix(in srgb,var(--color-text) 12%,transparent);stroke-width:1}.plot .frame{fill:none;stroke:var(--color-divider);stroke-width:1}.plot .axis{stroke:color-mix(in srgb,var(--color-text) 55%,transparent);stroke-width:1.5}.plot .guide{stroke:currentColor;stroke-width:1.25;stroke-dasharray:5 4;opacity:.7}.plot .curve{fill:none;stroke:currentColor;stroke-width:2.25;stroke-linejoin:round}.plot .curve.accent{stroke:var(--color-accent);stroke-width:2.75}.plot .curve.dashed{stroke-dasharray:8 5}.plot .dot{fill:currentColor}.plot .dot.accent-fill{fill:var(--color-accent)}.viz svg.plot{max-width:460px}.plot .tick{font-size:13px;opacity:.75}.plot .label{font-size:14px;font-weight:600}.plot .halo{paint-order:stroke;stroke:var(--color-bg);stroke-width:4px;stroke-linejoin:round}.stem .plot .halo{stroke:var(--color-surface)}.viz-error{font-size:14px;color:var(--color-accent-700)}.options{display:flex;flex-direction:column;gap:8px}.option{position:relative;display:grid;grid-template-columns:28px minmax(0,1fr);gap:8px;align-items:baseline;padding:12px 14px;min-height:52px;border:1px solid var(--color-divider);cursor:pointer;font-size:16px;line-height:1.5}.option input{position:absolute;opacity:0;width:0;height:0;pointer-events:none}.option:hover{background:color-mix(in srgb,var(--color-text) 5%,transparent)}.option:has(input:checked){border-color:var(--color-accent);box-shadow:inset 0 0 0 1px var(--color-accent);background:var(--color-accent-100)}.option:has(input:focus-visible){outline:2px solid var(--color-accent);outline-offset:2px}.option-letter{font-weight:800}.option:has(input:checked) .option-letter{color:var(--color-accent-700)}.catalog-row{grid-template-columns:minmax(0,1fr) auto;gap:16px;padding:14px 4px;border-bottom:1px solid var(--color-divider);min-height:64px}.catalog-row:disabled{cursor:default;opacity:.6}.catalog-row:disabled:hover{background:none}.catalog-desc{font-size:13px;line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.part-head.with-ask{grid-template-columns:36px minmax(0,1fr) auto}.part-head .ask{align-self:start;min-height:44px;margin-top:-10px;font-weight:600}.chips{display:flex;flex-wrap:wrap;align-items:center;gap:8px}.chip{min-height:44px;min-width:44px;padding:8px 12px}.practice-row{grid-template-columns:minmax(0,1fr) auto auto;gap:12px;padding:10px 4px;border-bottom:1px solid var(--color-divider);min-height:52px}.practice-row .q-num{font-size:15px;font-weight:600}.mode-switch .seg-opt{min-height:44px;padding:8px 12px;font-size:14px;font-weight:600}.section-head{display:flex;align-items:center;justify-content:space-between;gap:8px 16px;flex-wrap:wrap}.user-block+.user-block{padding-top:8px}@media (max-width: 420px){.app-nav{padding:10px 16px;gap:4px}.mode-switch .seg-opt{padding:8px 9px}.signout{padding:0 6px}}.admin-topic-row{grid-template-columns:36px minmax(0,1fr) auto}.status-line{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 0;border-bottom:1px solid var(--color-divider);font-size:15px;min-height:48px}.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border-top:2px solid var(--color-text)}.stat{display:flex;flex-direction:column;gap:2px;padding:14px 12px 14px 0}.stat-value{font-family:var(--font-heading);font-weight:800;font-size:28px;line-height:1.1}.stat-label{font-size:13px;color:color-mix(in srgb,var(--color-text) 65%,transparent)}.seg-tabs{align-self:flex-start;max-width:100%;flex-wrap:wrap;overflow:visible}.seg-tabs .seg-opt{border-bottom:1px solid var(--color-divider);margin-bottom:-1px}.seg-tabs .seg-opt{min-height:44px;padding:10px 16px;font-size:15px;font-weight:600}.panel{padding:16px;background:var(--color-surface);border-top:2px solid var(--color-text)}.table-toolbar{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.table-search{flex:1 1 220px;max-width:360px}.data-table{font-size:15px}.data-table th{white-space:nowrap}.data-table td{padding:10px 8px;vertical-align:middle}.data-table tr.clickable{cursor:pointer}.th-sort{all:unset;cursor:pointer;text-transform:inherit;letter-spacing:inherit}.th-sort:focus-visible,.row-open:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.row-open{all:unset;cursor:pointer;display:block}.cell-name{font-weight:600;overflow-wrap:break-word}.cell-course{min-width:180px}.cell-code{font-weight:700}.cell-course .cell-name{font-weight:500}.cell-tag{margin-left:8px;vertical-align:middle;font-size:11px}.meter{display:inline-flex;align-items:center;gap:8px;min-width:110px}.meter .bar{flex:1;min-width:48px;max-width:120px}@media (max-width: 560px){.stats{grid-template-columns:repeat(2,minmax(0,1fr))}.data-table .wide{display:none}.data-table{font-size:14px}.data-table td,.data-table th{padding-left:6px;padding-right:6px}.meter{min-width:0}.meter .bar{min-width:32px}}.check{display:inline-flex;align-items:center;gap:10px;min-height:44px;font-size:16px;cursor:pointer;align-self:flex-start}.check input{width:20px;height:20px;accent-color:var(--color-accent)}.steppers{display:flex;flex-wrap:wrap;gap:12px 20px}.stepper{display:flex;flex-direction:column;gap:6px;font-size:14px}.stepper-box{display:inline-flex}.stepper-box .btn{width:44px;min-height:44px;padding:0;justify-content:center;font-size:20px}.stepper-box .input{width:56px;min-height:44px;text-align:center;font-size:16px;border-radius:0;-moz-appearance:textfield}.stepper-box .input::-webkit-inner-spin-button,.stepper-box .input::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}.run-bar{max-width:none;height:6px}.run-bar>span{height:6px;transition:width .3s}.job-list{list-style:none;margin:0;padding:0;border-top:1px solid var(--color-divider);max-height:360px;overflow-y:auto}.job{display:grid;grid-template-columns:22px minmax(0,1fr) auto;gap:10px;align-items:baseline;padding:8px 2px;border-bottom:1px solid var(--color-divider);font-size:15px}.job-icon{text-align:center;font-weight:800}.job.done .job-icon{color:var(--color-accent-700)}.job.failed .job-icon,.job-error{color:var(--color-accent-800)}.job.queued{color:color-mix(in srgb,var(--color-text) 55%,transparent)}.job-error{display:block;font-size:13px}.job-time{font-size:13px;color:color-mix(in srgb,var(--color-text) 65%,transparent);font-variant-numeric:tabular-nums}.spinner{display:inline-block;width:12px;height:12px;border:2px solid var(--color-accent);border-right-color:transparent;border-radius:50%;animation:spin .8s linear infinite;vertical-align:-1px}@keyframes spin{to{transform:rotate(360deg)}}@media (prefers-reduced-motion: reduce){.spinner{animation-duration:2.4s}}.flag-open{align-self:flex-start;min-height:44px;gap:8px;font-size:14px;font-weight:600;color:color-mix(in srgb,var(--color-text) 70%,transparent);padding:0 6px 0 0}.flag-open:hover{color:var(--color-accent-700)}.flag-done{display:inline-flex;align-items:center;gap:6px}.flag-form{padding:16px;background:var(--color-surface);border-left:2px solid var(--color-accent)}.flag-cats{border:0;margin:0;padding:0}.flag-cat{font-size:15px;min-height:40px;align-items:center}.flag-thanks{padding:12px 16px;background:var(--color-accent-100);border-left:2px solid var(--color-accent);color:var(--color-accent-800);font-size:15px;line-height:1.5}.cell-snippet{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-width:160px}.seg-opt.seg-sm{min-height:40px;padding:8px 12px;font-size:14px;font-weight:600}.flag-quote{margin:0;padding:12px 16px;border-left:2px solid var(--color-accent);background:var(--color-surface);font-size:17px;line-height:1.55;white-space:pre-wrap}@media (max-width: 420px){.seg-tabs .seg-opt{padding:10px 11px;font-size:14px}}.photo-loading{display:grid;place-items:center;font-size:15px}.photo-status{font-size:15px;min-height:24px}.photo-status .spinner{margin-right:6px}.photo-ok{color:var(--color-accent-700);font-weight:700}.photo-err{color:var(--color-accent-800)}.photo-err .btn{min-height:36px;padding:4px 8px;font-weight:600}.card-list,.sort-menu{display:none}@media (max-width: 560px){.table-wrap.has-cards{display:none}.sort-menu{display:flex;align-items:center;gap:8px;flex:1 1 100%}.sort-menu select{flex:1;min-width:0}.table-search{max-width:none}.card-list{display:block;list-style:none;margin:0;padding:0;border-top:2px solid var(--color-divider)}.card-row{all:unset;box-sizing:border-box;width:100%;cursor:pointer;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px;align-items:center;padding:12px 2px;border-bottom:1px solid var(--color-divider);min-height:60px}.card-row:focus-visible{outline:2px solid var(--color-accent);outline-offset:-2px}.card-main{display:flex;flex-direction:column;gap:3px;min-width:0}.card-title{font-weight:700;font-size:16px;overflow-wrap:anywhere}.card-meta{font-size:13px;color:color-mix(in srgb,var(--color-text) 65%,transparent);line-height:1.4;overflow-wrap:anywhere}.card-side{display:flex;flex-direction:column;align-items:flex-end;gap:4px;font-size:13px;text-align:right}}.refresher-row{grid-template-columns:minmax(0,1fr) auto auto;padding:12px 4px}.crop{position:relative;overflow:hidden;touch-action:none;user-select:none;-webkit-user-select:none;background:#000;align-self:center;max-width:100%}.crop img{display:block;max-width:100%;max-height:60vh;width:auto;height:auto;pointer-events:none}.crop-rect{position:absolute;box-shadow:0 0 0 9999px #0000008c;outline:2px solid #fff;cursor:move;touch-action:none}.crop-handle{position:absolute;width:28px;height:28px;background:transparent;touch-action:none}.crop-handle:after{content:"";position:absolute;width:14px;height:14px;background:#fff;border:2px solid var(--color-accent)}.crop-handle.nw{left:-14px;top:-14px;cursor:nwse-resize}.crop-handle.nw:after{left:7px;top:7px}.crop-handle.ne{right:-14px;top:-14px;cursor:nesw-resize}.crop-handle.ne:after{right:7px;top:7px}.crop-handle.sw{left:-14px;bottom:-14px;cursor:nesw-resize}.crop-handle.sw:after{left:7px;bottom:7px}.crop-handle.se{right:-14px;bottom:-14px;cursor:nwse-resize}.crop-handle.se:after{right:7px;bottom:7px}.visually-hidden{position:absolute;width:1px;height:1px;opacity:0;overflow:hidden;pointer-events:none}.camera{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;background:#000;color:#fff;display:flex;flex-direction:column}.camera video{flex:1;min-height:0;width:100%;object-fit:contain;background:#000}.camera-msg{position:absolute;left:20px;right:20px;top:40%;text-align:center;font-size:16px;line-height:1.5;margin:0;align-items:center}.camera-bar{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:16px 20px calc(20px + env(safe-area-inset-bottom))}.camera-text{background:none;border:0;color:#fff;font-weight:600;font-size:16px;min-height:48px;justify-self:start}.camera-text:last-child{justify-self:end}.camera-tip{position:absolute;left:50%;top:16px;transform:translate(-50%);width:min(560px,calc(100% - 32px));margin:0;padding:10px 14px;background:#0009;font-size:15px;line-height:1.45;text-align:center}.shutter{width:76px;height:76px;border-radius:50%;border:5px solid #fff;background:#ffffff4d;cursor:pointer;padding:0}.shutter:active{background:#fff}.shutter:disabled{opacity:.4}.shutter:focus-visible{outline:3px solid var(--color-accent);outline-offset:4px}.feedback.is-correct h4{color:var(--color-accent-700)}.solution{padding:12px 14px;background:var(--color-surface);border-left:2px solid var(--color-accent)}.result-summary.is-correct{color:var(--color-accent-700)}.result-parts{border-top:2px solid var(--color-divider)}.result-part{padding:16px 0;border-bottom:1px solid var(--color-divider);display:flex;flex-direction:column;gap:10px}.result-head{display:grid;grid-template-columns:36px minmax(0,1fr) auto;gap:4px 10px;align-items:start;font-size:17px;line-height:1.55}.result-head .part-label{padding-top:1px}.result-head .tag{margin-top:3px}.result-head:not(:has(.part-label)){grid-template-columns:minmax(0,1fr) auto}.result-body{padding-left:46px}.result-head:not(:has(.part-label))+.result-body{padding-left:0}.result-k{font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:color-mix(in srgb,var(--color-text) 60%,transparent)}.part-actions{display:flex;gap:4px;flex-wrap:wrap;margin-left:-10px}.part-actions .btn{min-height:40px;font-weight:600}.chat-inline{padding:12px 14px;background:var(--color-surface);border-left:2px solid var(--color-accent)}.chat-inline .msg-user,.chat-inline .msg-ai{font-size:15px}.ask-all{font-weight:600;padding-left:0}.ask-part svg,.ask-whole svg{margin-right:6px}.legacy-feedback summary{cursor:pointer}@media (max-width: 480px){.result-body{padding-left:0}}.danger-zone{padding-top:24px;border-top:2px solid var(--color-divider)}.unlock-box{padding:14px 16px;border:2px solid var(--color-accent);background:var(--color-surface)}.topic-row.locked .topic-title{opacity:.7}.exam-mid{padding:4px 0 8px}.group{border-bottom:1px solid var(--color-divider)}.group.sub{border-bottom:0;border-top:1px solid var(--color-divider)}.group-head{list-style:none;display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:52px;padding:10px 4px;cursor:pointer;font-size:16px;font-weight:600}.group-head::-webkit-details-marker{display:none}.group-head:before{content:"";flex:none;width:7px;height:7px;margin:0 4px 0 2px;border-right:2px solid var(--color-accent-700);border-bottom:2px solid var(--color-accent-700);transform:rotate(-45deg);transition:transform .15s}.group[open]>.group-head:before{transform:rotate(45deg)}.group-head>span:first-of-type{flex:1;min-width:0}.group.sub>.group-head{font-size:15px;font-weight:500;padding-left:18px;min-height:46px}.group-body{padding-left:14px}.group.sub .group-body{padding-left:18px}.course-line{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 4px;min-height:52px;text-align:left;width:100%;border-top:1px solid var(--color-divider)}.course-line-name{font-size:15px;font-weight:600}.course-line.is-enrolled,.course-line.is-completed{box-shadow:inset 3px 0 0 var(--line-mark);padding-left:10px;background:color-mix(in srgb,var(--line-mark) 6%,transparent)}.course-line.is-enrolled{--line-mark: var(--color-accent)}.course-line.is-completed{--line-mark: var(--easy)}.course-line .tag svg{margin-right:3px;vertical-align:-2px}.admin-topic-li{display:flex;align-items:center;gap:8px;border-bottom:1px solid var(--color-divider)}.admin-topic-li>.list-row{flex:1;min-width:0;border-bottom:0}.fill-cell{flex:none;display:flex;justify-content:flex-end;min-width:92px}.content-line{display:flex;flex-wrap:wrap;gap:4px 12px;font-size:13px;color:var(--color-text);opacity:.85}.have{font-weight:700;color:var(--color-accent-700)}.have.ok{color:inherit;font-weight:600;opacity:.8}.solution.worked{line-height:1.7}.option.static{cursor:default}.option.static.correct{grid-template-columns:28px minmax(0,1fr) auto;border-color:var(--easy);box-shadow:inset 0 0 0 1px var(--easy);background:color-mix(in srgb,var(--easy) 12%,var(--color-bg))}.option.static.correct .option-letter{color:var(--easy)}.option-correct{align-self:center;font-size:13px;font-weight:700;color:var(--easy);white-space:nowrap}:root{--easy: #1e7d45;--medium: #a86400;--hard: #c0262d;--all: var(--color-neutral-600)}@media (prefers-color-scheme: dark){:root:not([data-theme=light]){--easy: #5fd08f;--medium: #f2b14c;--hard: #ff7b7f}}:root[data-theme=dark]{--easy: #5fd08f;--medium: #f2b14c;--hard: #ff7b7f}.diff-easy{--diff: var(--easy)}.diff-medium{--diff: var(--medium)}.diff-hard{--diff: var(--hard)}.diff-all{--diff: var(--all)}.diff-chips{display:flex;flex-wrap:wrap;gap:6px}.diff-chip{display:inline-flex;gap:4px;align-items:baseline;padding:3px 8px;font-size:13px;border:1.5px solid var(--diff);background:color-mix(in srgb,var(--diff) 12%,transparent);white-space:nowrap}.diff-chip>b{color:var(--diff);font-weight:700}.diff-chip .have.ok{color:inherit}.diff-section{display:flex;flex-direction:column;gap:14px;padding:14px 14px 6px;border-left:4px solid var(--diff);background:color-mix(in srgb,var(--diff) 7%,transparent)}.diff-title{color:var(--diff)}.seg-diff .seg-opt{box-shadow:inset 4px 0 0 var(--diff)}.seg-diff .seg-opt:has(input:checked){background:var(--diff);color:#fff}:root[data-theme=dark] .seg-diff .seg-opt:has(input:checked){color:#161514}@media (prefers-color-scheme: dark){:root:not([data-theme=light]) .seg-diff .seg-opt:has(input:checked){color:#161514}}.fill-backdrop{z-index:50}.fill-dialog{width:min(520px,100%);max-height:calc(100dvh - 32px);overflow-y:auto;border-radius:0}.diff-easy .stepper label,.diff-medium .stepper label,.diff-hard .stepper label{color:var(--diff);font-weight:700}.fill-dialog .dialog-actions{position:sticky;bottom:calc(-1 * var(--space-4));margin:0 calc(-1 * var(--space-4)) calc(-1 * var(--space-4));padding:12px var(--space-4);background:var(--color-surface);border-top:1px solid var(--color-divider)}.work-list{display:flex;flex-direction:column}.work-row{display:grid;grid-template-columns:minmax(0,1fr) auto 18px;align-items:center;gap:10px;min-height:52px;padding:8px 2px;text-align:left;width:100%;border:0;border-top:1px solid color-mix(in srgb,var(--diff) 35%,transparent);background:none;cursor:pointer;color:inherit;font:inherit;box-shadow:none}.work-row:hover .work-title{text-decoration:underline}.work-title{font-size:15px;font-weight:600;min-width:0}.work-tag{font-size:12px;font-weight:700;padding:3px 8px;white-space:nowrap;border:1px solid currentColor}.st-ok{color:var(--easy)}.st-review{color:var(--hard)}.st-none{color:var(--color-neutral-600)}.st-example{color:var(--medium)}.q-title{margin:-4px 0 0;font-size:22px;line-height:1.25}text-align: left; font: inherit; color: var(--color-text); cursor: pointer; background: var(--color-surface); border: 2px solid color-mix(in srgb,var(--color-text) 70%,transparent); box-shadow: 0 3px 0 color-mix(in srgb,var(--color-text) 70%,transparent); transition: transform .08s,box-shadow .08s,background .15s; } .pick-label{font-size:14px;font-weight:700}color: var(--diff); background: color-mix(in srgb,var(--diff) 12%,var(--color-bg)); border: 2px solid var(--diff); box-shadow: 0 3px 0 var(--diff); transition: transform .08s,box-shadow .08s; } .notice{padding:12px 14px;font-size:15px;line-height:1.5;border-left:3px solid var(--medium);background:color-mix(in srgb,var(--medium) 12%,transparent)}.confirm-dialog{width:min(440px,100%);border-radius:0;gap:12px;display:flex;flex-direction:column}.quiz-box{padding:16px;background:var(--color-surface);align-items:flex-start}.quiz-box>.stack,.quiz-box>.work-row{width:100%}.quiz-status{font-size:14px;font-weight:700;color:var(--medium)}.quiz-row{padding-left:12px;border-left:4px solid var(--diff);background:color-mix(in srgb,var(--diff) 8%,transparent);margin-bottom:4px;border-top:0}.quiz-q-meta{font-size:12px;font-weight:700;color:var(--diff)}.strong-btn{border:2px solid var(--color-text)}.ai-note{display:flex;gap:10px;align-items:flex-start;padding:12px 14px;font-size:14px;line-height:1.5;background:color-mix(in srgb,var(--color-text) 6%,transparent);border-left:3px solid var(--color-text)}.ai-note>svg{flex:none;margin-top:3px}.ai-note.small{padding:8px 12px;font-size:13px;border-left-width:2px}.access-tag{display:inline-flex;align-items:center;gap:4px;width:fit-content;padding:3px 9px;font-size:12px;font-weight:700;white-space:nowrap;border:1.5px solid currentColor}.access-full{color:var(--easy);background:color-mix(in srgb,var(--easy) 12%,transparent)}.access-preview{color:var(--medium);border-style:dashed}.access-free{color:var(--color-text)}.access-own{color:var(--color-accent-700)}.access-ai{color:color-mix(in srgb,var(--color-text) 65%,transparent);border-color:transparent;padding-left:0}.prep-box{padding:14px 16px;border:2px solid var(--medium);background:color-mix(in srgb,var(--medium) 8%,transparent)}.h-section{margin:0;font-size:22px}.level-head{margin:8px 0 0;font-size:18px;padding-bottom:6px;border-bottom:2px solid var(--color-text)}.subject-head{margin:0;font-size:13px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--color-accent-700)}.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}@media (max-width: 560px){.stats{grid-template-columns:repeat(2,minmax(0,1fr))}}.stat{display:flex;flex-direction:column;gap:2px;padding:12px 14px;background:var(--color-surface);min-width:0}.stat-k{font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;opacity:.7}.stat-v{font-family:var(--font-heading);font-size:30px;font-weight:800;line-height:1.1}.stat-note{font-size:13px;opacity:.75}.resume{display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%;padding:14px 16px;text-align:left;font:inherit;cursor:pointer;color:var(--color-bg);background:var(--color-text);border:0}.resume:hover{background:color-mix(in srgb,var(--color-text) 88%,var(--color-accent))}.resume-k{font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;opacity:.75}.resume-title{font-family:var(--font-heading);font-size:17px;font-weight:700}.course-card{display:flex;flex-direction:column;gap:14px;padding:16px;background:var(--color-surface);border-left:4px solid var(--color-text)}.course-card.card-full{border-left-color:var(--easy)}.course-card.card-preview{border-left:4px dashed var(--medium)}.course-card-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;padding:0;text-align:left;font:inherit;color:inherit;background:none;border:0;cursor:pointer}.course-card-head:hover .course-card-name{text-decoration:underline}.course-card-name{font-family:var(--font-heading);font-size:19px;font-weight:700;line-height:1.25}.seg-bar{display:flex;height:10px;width:100%;background:color-mix(in srgb,var(--color-text) 14%,transparent)}.seg-passed{background:var(--color-accent)}.seg-practicing{background:color-mix(in srgb,var(--color-accent) 35%,transparent)}.breakdown{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px 16px;margin:0}@media (max-width: 420px){.breakdown{grid-template-columns:1fr}}.breakdown dt{font-size:12px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;opacity:.65}.breakdown dd{margin:0;font-size:14px}.course-card-foot{display:flex;flex-wrap:wrap;gap:8px;align-items:center}.course-card-foot:empty{display:none}.trophy{color:var(--medium);display:inline-flex}.order-note{margin-top:-8px}.tag-lock{display:inline-flex;align-items:center;gap:4px;color:var(--color-text);background:color-mix(in srgb,var(--color-text) 12%,transparent);font-weight:600}.tag-wait{display:inline-flex;align-items:center;gap:4px;color:var(--color-neutral-700);border:1.5px dashed currentColor;background:none;font-weight:600}.tag-skip{display:inline-flex;align-items:center;gap:4px;color:var(--medium);border:1.5px solid currentColor;background:none;font-weight:600}.topic-row.waiting .topic-title,.topic-row.waiting .num{opacity:.55}.topic-row.waiting{background:repeating-linear-gradient(-45deg,transparent 0 10px,color-mix(in srgb,var(--color-text) 4%,transparent) 10px 20px)}.wait-box{padding:12px 14px;font-size:14px;line-height:1.5;border:1.5px dashed color-mix(in srgb,var(--color-text) 50%,transparent);display:flex;flex-direction:column;gap:6px;align-items:flex-start}.wait-box .btn svg,.topic-end .btn svg{margin-right:4px}.topic-end{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;padding-top:16px;border-top:1px solid var(--color-divider)}.seg-skipped{background:repeating-linear-gradient(-45deg,var(--medium) 0 3px,color-mix(in srgb,var(--medium) 40%,transparent) 3px 6px)}.ratio{display:flex;flex-direction:column;gap:4px}.ratio-bar{display:block;height:4px;max-width:160px;background:color-mix(in srgb,var(--color-text) 14%,transparent)}.ratio-bar>span{display:block;height:4px;background:var(--easy)}.understood{align-items:flex-start}.understood-btn{min-height:48px;padding:10px 18px;border:2px solid var(--easy);color:var(--easy)}.understood-btn.on{background:var(--easy);color:#fff}:root[data-theme=dark] .understood-btn.on{color:#161514}@media (prefers-color-scheme: dark){:root:not([data-theme=light]) .understood-btn.on{color:#161514}}.mark{display:inline-block;padding:3px 9px;font-size:13px;font-weight:800;white-space:nowrap;border:1.5px solid currentColor;font-variant-numeric:tabular-nums}.mark-zero{color:var(--hard);background:color-mix(in srgb,var(--hard) 12%,transparent)}.mark-part{color:var(--medium);background:color-mix(in srgb,var(--medium) 12%,transparent)}.mark-full{color:var(--easy);background:color-mix(in srgb,var(--easy) 12%,transparent)}.result-summary .mark{font-size:18px;padding:4px 12px}.practice-pct{font-size:15px}.back-links{display:flex;flex-wrap:wrap;gap:8px;padding-top:16px;border-top:1px solid var(--color-divider)}.back-links .btn{min-height:48px;border:2px solid color-mix(in srgb,var(--color-text) 70%,transparent);text-align:left}.danger-text{color:var(--hard)}.confirm-dialog .check{font-size:15px}.grades-course{padding:16px;background:var(--color-surface)}.grades-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;padding:0;text-align:left;font:inherit;color:inherit;background:none;border:0;cursor:pointer}.grades-head:hover .course-card-name{text-decoration:underline}.grade-list{display:flex;flex-direction:column}.grade-row{display:grid;grid-template-columns:minmax(0,1fr) auto 18px;align-items:center;gap:10px;min-height:52px;padding:8px 2px;text-align:left;width:100%;border:0;border-top:1px solid var(--color-divider);background:none;color:inherit;font:inherit}button.grade-row{cursor:pointer}button.grade-row:hover .work-title{text-decoration:underline}.worksheet-items{margin:0;padding-left:22px;display:flex;flex-direction:column;gap:8px}.worksheet-items li{display:flex;flex-wrap:wrap;gap:4px 14px;align-items:baseline}.worksheet-answer{color:var(--easy);font-size:14px}:root{--c-overview: #2f5fa8;--c-quiz: #7a3fa0;--c-sheet: #0f7c7c}@media (prefers-color-scheme: dark){:root:not([data-theme=light]){--c-overview: #8fb4ff;--c-quiz: #d4a3f5;--c-sheet: #6fd6d6}}:root[data-theme=dark]{--c-overview: #8fb4ff;--c-quiz: #d4a3f5;--c-sheet: #6fd6d6}.content-overview{--diff: var(--c-overview)}.content-quiz{--diff: var(--c-quiz)}.content-sheet{--diff: var(--c-sheet)}.diff-chip.missing{border-style:dashed;background:transparent}.bulk-list{border-top:1px solid var(--color-divider)}.bulk-row{width:100%;display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:10px;align-items:center;padding:8px 2px;border-bottom:1px solid var(--color-divider)}.bulk-name{font-weight:600;min-width:0}.sheet-box{padding:16px;border:2px solid var(--c-sheet);background:color-mix(in srgb,var(--c-sheet) 9%,var(--color-bg))}.sheet-box>.row svg,.sheet-title{color:var(--c-sheet)}.sheet-box .work-row{border-top-color:color-mix(in srgb,var(--c-sheet) 35%,transparent)}.sheet-btn{background:var(--c-sheet);border-color:var(--c-sheet);color:#fff}.sheet-btn:hover{background:color-mix(in srgb,var(--c-sheet) 85%,#000)}:root[data-theme=dark] .sheet-btn{color:#161514}@media (prefers-color-scheme: dark){:root:not([data-theme=light]) .sheet-btn{color:#161514}}.app-footer{display:flex;flex-wrap:wrap;gap:6px 18px;justify-content:center;padding:32px 16px 28px;font-size:13px;color:color-mix(in srgb,var(--color-text) 60%,transparent)}.app-footer a{color:inherit}.auth-links{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px}.legal-body h2{font-size:19px;margin:24px 0 8px}.legal-body ul{padding-left:20px}.legal-body li{margin-bottom:6px}.part-head.no-label{grid-template-columns:minmax(0,1fr)}.part-head.no-label.with-ask{grid-template-columns:minmax(0,1fr) auto}.convo-row{grid-template-columns:minmax(0,1fr) auto;gap:10px;padding:12px 4px;border-bottom:1px solid var(--color-divider);text-align:left;width:100%}.convo-first{font-size:14px;font-style:italic;color:color-mix(in srgb,var(--color-text) 75%,transparent)}:root{--c-ref: #a3520c}@media (prefers-color-scheme: dark){:root:not([data-theme=light]){--c-ref: #f5a65b}}:root[data-theme=dark]{--c-ref: #f5a65b}.refresher-box{padding:16px;border:2px solid var(--c-ref);background:color-mix(in srgb,var(--c-ref) 9%,var(--color-bg));align-items:flex-start}.refresher-box>.row{width:100%}.refresher-box>.row svg,.refresher-title{color:var(--c-ref)}.refresher-hide{color:var(--color-text);opacity:.75}.refresher-hide svg{margin-right:2px}.refresher-btn{background:var(--c-ref);border-color:var(--c-ref);color:#fff}.refresher-btn:hover{background:color-mix(in srgb,var(--c-ref) 85%,#000)}:root[data-theme=dark] .refresher-btn{color:#161514}@media (prefers-color-scheme: dark){:root:not([data-theme=light]) .refresher-btn{color:#161514}}.unit-current{background:color-mix(in srgb,var(--color-accent) 6%,transparent);box-shadow:inset 3px 0 0 var(--color-accent)}.unit-current .topic-row:hover{background:color-mix(in srgb,var(--color-accent) 6%,transparent)}.unit-now{font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--color-accent)}.topic-row>:last-child>svg{flex:none;opacity:.45}.topic-row:hover>:last-child>svg{opacity:.9}.topic-actions{display:flex;gap:8px;flex-wrap:wrap;align-items:center;padding:0 4px 14px 52px}.topic-actions .btn svg{margin-right:6px}.exam-summary{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px}.exam-sum-card{all:unset;box-sizing:border-box;cursor:pointer;display:flex;flex-direction:column;gap:2px;padding:12px 14px;border:2px solid var(--diff, var(--color-divider));background:color-mix(in srgb,var(--diff, transparent) 9%,var(--color-bg))}.exam-sum-card.ok{--diff: var(--easy)}.exam-sum-card.low{--diff: var(--hard)}.exam-sum-card.empty{cursor:default;border-style:dashed}.exam-sum-card:not(.empty):hover{background:color-mix(in srgb,var(--diff) 15%,var(--color-bg))}.exam-sum-k{font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase}.exam-sum-v{font-size:30px;font-weight:800;line-height:1.1;color:var(--diff, inherit)}.exam-result{all:unset;box-sizing:border-box;cursor:pointer;display:flex;flex-direction:column;gap:6px;padding:14px 16px;border:2px solid var(--diff);background:color-mix(in srgb,var(--diff) 9%,var(--color-bg))}.exam-result.ok{--diff: var(--easy)}.exam-result.low{--diff: var(--hard)}.exam-result:hover{background:color-mix(in srgb,var(--diff) 15%,var(--color-bg))}.exam-result>.row svg{color:var(--diff)}.exam-result-k{font-size:15px;font-weight:700}.exam-result-v{font-size:36px;font-weight:800;line-height:1;color:var(--diff)}.exam-result-score{font-size:17px;font-weight:700}.exam-result-link{display:inline-flex;align-items:center;gap:2px;font-size:14px;font-weight:600;color:var(--color-accent)}.leave-course{padding-top:16px;border-top:1px solid var(--color-divider)}.year-head{font-size:13px;font-weight:600;color:color-mix(in srgb,var(--color-text) 65%,transparent);padding:4px 4px 2px}.catalog-year+.catalog-year{margin-top:6px}.transcript-row{grid-template-columns:minmax(0,1fr) auto;gap:12px;padding:12px 4px;border-bottom:1px solid var(--color-divider);min-height:60px}.transcript-course{font-size:15px}.transcript-course b{margin-right:4px}.transcript-grade{align-items:flex-end;gap:2px}.transcript-letter{font-size:13px;font-weight:700}@media print{.app-nav,.app-footer,.no-print,.btn-back,.record-tabs{display:none!important}body{background:#fff;color:#000}}.jump-links{display:flex;flex-wrap:wrap;gap:6px}.jump{all:unset;box-sizing:border-box;cursor:pointer;font-size:14px;font-weight:600;padding:6px 12px;min-height:36px;display:inline-flex;align-items:center;border:1.5px solid var(--c, color-mix(in srgb, var(--color-text) 35%, transparent));color:var(--c, var(--color-text))}.jump:hover{background:color-mix(in srgb,var(--c, var(--color-text)) 10%,transparent)}.jump:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.jump-overview{--c: var(--c-overview)}.jump-tutor{--c: var(--c-tutor)}.jump-sheet{--c: var(--c-sheet)}.jump-quiz{--c: var(--c-quiz)}.jump-target{scroll-margin-top:76px}.overview-title{color:var(--c-overview)}.overview-collapsed{all:unset;cursor:pointer;font-size:14px;color:color-mix(in srgb,var(--color-text) 65%,transparent);padding:10px 12px;border:1.5px dashed color-mix(in srgb,var(--c-overview) 50%,transparent)}.credits-btn b{margin-left:6px;padding:0 7px;background:var(--color-text);color:var(--color-bg);font-size:13px;line-height:20px}.credits-btn svg:first-child{margin-right:4px}.credits-total{font-size:17px}.credits-total b{font-size:24px}.credits-line{all:unset;cursor:pointer;font-size:13px;color:color-mix(in srgb,var(--color-text) 65%,transparent)}.credits-line:hover{color:var(--color-text);text-decoration:underline}.credits-line:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.credits-out{display:flex;flex-direction:column;gap:10px;align-items:flex-start;padding:12px 14px;font-size:14px;line-height:1.5;border-left:3px solid var(--color-accent);background:color-mix(in srgb,var(--color-accent) 9%,transparent)}.packs{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:14px 10px;padding-top:8px}.pack{all:unset;box-sizing:border-box;cursor:pointer;display:flex;flex-direction:column;align-items:flex-start;gap:2px;padding:14px 16px;border:2px solid var(--color-divider);background:var(--color-surface)}.pack:hover:not(:disabled){border-color:var(--color-accent)}.pack:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.pack:disabled{opacity:.6;cursor:default}.pack-n{font-size:30px;font-weight:800;line-height:1.1}.pack-k{font-size:13px;font-weight:700;letter-spacing:.06em;text-transform:uppercase}.pack-price{margin-top:8px;font-size:18px;font-weight:700;color:var(--color-accent)}.pack{position:relative}.pack.best{border-color:var(--color-accent);background:linear-gradient(160deg,color-mix(in srgb,var(--color-accent) 12%,var(--color-surface)),var(--color-surface) 70%);box-shadow:0 6px 18px color-mix(in srgb,var(--color-accent) 22%,transparent)}.pack-ribbon{position:absolute;top:-11px;right:10px;display:inline-flex;align-items:center;gap:4px;padding:3px 9px;font-size:11px;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:#fff;background:linear-gradient(90deg,var(--color-accent),var(--color-accent-2));box-shadow:0 2px 6px color-mix(in srgb,var(--color-accent) 35%,transparent)}.credit-row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px;align-items:center;padding:10px 4px;border-bottom:1px solid var(--color-divider)}.credit-what{font-size:14px;overflow-wrap:anywhere}.credit-title{font-size:13px;overflow-wrap:anywhere}.credit-row.link{all:unset;box-sizing:border-box;width:100%;cursor:pointer;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px;align-items:center;padding:10px 4px;border-bottom:1px solid var(--color-divider)}.credit-row.link:hover{background:color-mix(in srgb,var(--color-text) 5%,transparent)}.credit-row.link:focus-visible{outline:2px solid var(--color-accent);outline-offset:-2px}.credit-row.link svg{opacity:.5}.chat-collapsed{all:unset;box-sizing:border-box;cursor:pointer;width:100%;display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:12px;align-items:center;padding:12px 14px;border:1.5px solid var(--c-tutor);background:color-mix(in srgb,var(--c-tutor) 7%,var(--color-bg))}.chat-collapsed:hover{background:color-mix(in srgb,var(--c-tutor) 12%,var(--color-bg))}.chat-collapsed:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.chat-collapsed>svg{color:var(--c-tutor)}.chat-collapsed-title{font-size:15px;font-weight:700}.chat-collapsed-meta{font-size:13px;color:color-mix(in srgb,var(--color-text) 65%,transparent)}.chat-collapsed-cta{display:inline-flex;align-items:center;gap:2px;font-size:14px;font-weight:700;color:var(--c-tutor)}.credit-amt{font-weight:800;font-size:15px}.credit-amt.plus{color:var(--easy)}.credit-amt.minus{color:color-mix(in srgb,var(--color-text) 70%,transparent)}.bonus-badge{display:flex;gap:10px;align-items:flex-start;padding:10px 12px;font-size:14px;line-height:1.45;border:1.5px dashed var(--easy);background:color-mix(in srgb,var(--easy) 10%,transparent)}.bonus-badge svg{flex:none;margin-top:2px;color:var(--easy)}.test-pay-note{display:block;padding:10px 12px;font-size:14px;line-height:1.45;border:1.5px dashed var(--c-sheet);background:color-mix(in srgb,var(--c-sheet) 10%,transparent)}.test-pay-note code{font-family:var(--font-mono, ui-monospace, monospace);font-weight:700;white-space:nowrap}.account{position:relative}.account-btn{all:unset;box-sizing:border-box;cursor:pointer;display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:4px 8px 4px 4px;border:1px solid transparent}.account-btn:hover,.account-btn[aria-expanded=true]{border-color:var(--color-divider);background:color-mix(in srgb,var(--color-text) 5%,transparent)}.account-btn:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.account-btn>svg{opacity:.7;transition:transform .15s}.account-btn[aria-expanded=true]>svg{transform:rotate(180deg)}.avatar{width:32px;height:32px;flex:none;display:inline-flex;align-items:center;justify-content:center;background:var(--color-text);color:var(--color-bg);font-family:var(--font-heading);font-weight:800;font-size:15px}.avatar.lg{width:40px;height:40px;font-size:18px}.account-name{font-size:14px;font-weight:600;max-width:140px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}@media (max-width: 480px){.account-name{display:none}}.account-menu{position:absolute;right:0;top:calc(100% + 6px);z-index:20;width:260px;max-width:calc(100vw - 32px);background:var(--color-bg);border:1px solid var(--color-divider);box-shadow:0 10px 30px #00000024;animation:menu-in .12s ease-out}@keyframes menu-in{0%{opacity:0;transform:translateY(-4px)}}.account-head{display:flex;align-items:center;gap:12px;padding:14px 16px;border-bottom:1px solid var(--color-divider)}.account-head-name{font-weight:700;font-size:15px;overflow:hidden;text-overflow:ellipsis}.account-head-email{font-size:12px;color:color-mix(in srgb,var(--color-text) 60%,transparent);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.account-group{padding:6px 0}.account-group+.account-group{border-top:1px solid var(--color-divider)}.account-item{all:unset;box-sizing:border-box;cursor:pointer;width:100%;display:flex;align-items:center;gap:12px;min-height:44px;padding:8px 16px;font-size:15px}.account-item:hover,.account-item:focus-visible{background:color-mix(in srgb,var(--color-text) 6%,transparent)}.account-item.current{box-shadow:inset 3px 0 0 var(--color-accent)}.account-item>svg{flex:none;opacity:.75}.account-item-label{flex:1}.account-badge{font-size:13px;font-weight:700;padding:1px 8px;background:color-mix(in srgb,var(--easy) 14%,transparent);color:var(--easy)}.account-badge.out{background:color-mix(in srgb,var(--color-accent) 14%,transparent);color:var(--color-accent)}.switch{width:34px;height:20px;flex:none;position:relative;background:var(--color-neutral-300);border-radius:10px;transition:background .15s}.switch>span{position:absolute;top:2px;left:2px;width:16px;height:16px;border-radius:50%;background:#fff;transition:transform .15s}.switch.on{background:var(--color-accent)}.switch.on>span{transform:translate(14px)}.record-tabs{display:flex;gap:24px;border-bottom:1px solid var(--color-divider)}.record-tab{all:unset;cursor:pointer;padding:10px 0;margin-bottom:-1px;font-size:15px;font-weight:600;color:color-mix(in srgb,var(--color-text) 60%,transparent);border-bottom:2px solid transparent}.record-tab:hover{color:var(--color-text)}.record-tab.on{color:var(--color-text);border-bottom-color:var(--color-accent)}.record-tab:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.nav-home{all:unset;box-sizing:border-box;cursor:pointer;display:inline-flex;align-items:center;gap:7px;min-height:44px;padding:0 12px;font-size:14px;font-weight:600;border:1px solid transparent}.nav-home:hover{background:color-mix(in srgb,var(--color-text) 6%,transparent)}.nav-home:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.nav-home.on{color:var(--color-accent);box-shadow:inset 0 -2px 0 var(--color-accent)}@media (max-width: 480px){.app-nav:has(.mode-switch) .nav-home-label{display:none}.nav-home{padding:0 10px}}:root{--c-tutor: #b02a78}@media (prefers-color-scheme: dark){:root:not([data-theme=light]){--c-tutor: #f08cc6}}:root[data-theme=dark]{--c-tutor: #f08cc6}.tutor-box{padding:16px;border:2px solid var(--c-tutor);background:color-mix(in srgb,var(--c-tutor) 8%,var(--color-bg));align-items:flex-start}.tutor-box>.row svg,.tutor-title{color:var(--c-tutor)}.tutor-btn{background:var(--c-tutor);border-color:var(--c-tutor);color:#fff}.tutor-btn:hover{background:color-mix(in srgb,var(--c-tutor) 85%,#000)}:root[data-theme=dark] .tutor-btn{color:#161514}@media (prefers-color-scheme: dark){:root:not([data-theme=light]) .tutor-btn{color:#161514}}.tutor-outline{border-color:var(--c-tutor);color:var(--c-tutor)}.tutor-outline:hover{background:color-mix(in srgb,var(--c-tutor) 10%,transparent)}.credits-card{all:unset;box-sizing:border-box;cursor:pointer;display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:14px;align-items:center;padding:14px 16px;border:2px solid var(--c-tutor);background:color-mix(in srgb,var(--c-tutor) 8%,var(--color-bg))}.credits-card:hover{background:color-mix(in srgb,var(--c-tutor) 13%,var(--color-bg))}.credits-card:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.credits-card-icon{width:44px;height:44px;display:inline-flex;align-items:center;justify-content:center;background:var(--c-tutor);color:#fff}:root[data-theme=dark] .credits-card-icon{color:#161514}@media (prefers-color-scheme: dark){:root:not([data-theme=light]) .credits-card-icon{color:#161514}}.credits-card-k{font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--c-tutor)}.credits-card-v{font-size:16px}.credits-card-v b{font-family:var(--font-heading);font-size:26px;font-weight:800;line-height:1;margin-right:4px}.credits-card-note{font-size:13px;color:color-mix(in srgb,var(--color-text) 65%,transparent)}.credits-card-cta{display:inline-flex;align-items:center;gap:2px;font-size:14px;font-weight:700;color:var(--c-tutor);white-space:nowrap}.credits-card.out{border-color:var(--color-accent)}@media (max-width: 420px){.credits-card{grid-template-columns:auto minmax(0,1fr)}.credits-card-cta{grid-column:2}}.stats-6{grid-template-columns:repeat(3,minmax(0,1fr))}@media (max-width: 560px){.stats-6{grid-template-columns:repeat(2,minmax(0,1fr))}}.stat-practice{box-shadow:inset 0 3px 0 var(--k-practice)}.stat-worksheet{box-shadow:inset 0 3px 0 var(--k-worksheet)}.stat-courses{box-shadow:inset 0 3px 0 var(--k-example)}.stat-units{box-shadow:inset 0 3px 0 var(--k-quiz)}.stat-exams{box-shadow:inset 0 3px 0 var(--k-exam)}.stat-tutor{box-shadow:inset 0 3px 0 var(--k-tutor)}:root{--k-practice: var(--color-accent);--k-worksheet: var(--c-sheet);--k-example: var(--c-overview);--k-quiz: var(--c-quiz);--k-exam: var(--easy);--k-tutor: var(--c-tutor)}.seg-practice{background:var(--k-practice)}.seg-worksheet{background:var(--k-worksheet)}.seg-example{background:var(--k-example)}.seg-quiz{background:var(--k-quiz)}.seg-exam{background:var(--k-exam)}.seg-tutor{background:var(--k-tutor)}.activity{display:flex;flex-direction:column;gap:12px;padding:14px 16px 12px;background:var(--color-surface)}.activity-head{display:flex;justify-content:space-between;align-items:flex-start;gap:10px;flex-wrap:wrap}.activity-title{font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;opacity:.7}.activity-range{display:inline-flex;border:1px solid var(--color-divider)}.activity-range button{all:unset;cursor:pointer;padding:5px 10px;font-size:12px;font-weight:600}.activity-range button+button{border-left:1px solid var(--color-divider)}.activity-range button.on{background:var(--color-text);color:var(--color-bg)}.activity-range button:focus-visible{outline:2px solid var(--color-accent);outline-offset:-2px}.activity-plot{display:grid;grid-template-columns:auto minmax(0,1fr);column-gap:6px;row-gap:4px}.activity-grid{display:flex;flex-direction:column;justify-content:space-between;height:140px;font-size:11px;line-height:1;text-align:right;color:color-mix(in srgb,var(--color-text) 55%,transparent)}.activity-bars{display:flex;align-items:flex-end;height:140px;border-bottom:1px solid var(--color-divider);background:linear-gradient(to bottom,color-mix(in srgb,var(--color-text) 9%,transparent) 1px,transparent 1px) 0 0 / 100% 70px}.activity-col{flex:1;min-width:0;height:100%;display:flex;align-items:flex-end}.activity-col:hover{background:color-mix(in srgb,var(--color-text) 5%,transparent)}.activity-col{gap:1px}.activity-bar{flex:1;min-width:0;display:block}.activity-bar[style*="height: 0%"]{visibility:hidden}.activity-days{display:flex;font-size:10px;color:color-mix(in srgb,var(--color-text) 60%,transparent)}.activity-days>span{flex:1;min-width:0;display:flex;justify-content:flex-end;white-space:nowrap;overflow:visible}.activity-legend{display:flex;flex-wrap:wrap;gap:6px 14px;font-size:12px}.activity-legend span{display:inline-flex;align-items:center;gap:6px}.activity-legend i{width:10px;height:10px;display:inline-block}.thread-tag{display:inline-flex;align-items:center;gap:3px;font-size:12px;font-weight:700;color:var(--c-tutor);padding:2px 6px;border:1px solid color-mix(in srgb,var(--c-tutor) 45%,transparent)}.fill-course{padding:16px;border:2px solid var(--color-accent);background:color-mix(in srgb,var(--color-accent) 6%,var(--color-bg));align-items:flex-start}.job-details>summary{cursor:pointer}.photo-problem{display:flex;gap:12px;align-items:flex-start;padding:14px 16px;border:2px solid var(--c-ref);background:color-mix(in srgb,var(--c-ref) 9%,var(--color-bg));font-size:15px;line-height:1.5}.photo-problem>svg{color:var(--c-ref);flex:none;margin-top:1px}:root{--c-gift: #8f6a00}@media (prefers-color-scheme: dark){:root:not([data-theme=light]){--c-gift: #f0c75e}}:root[data-theme=dark]{--c-gift: #f0c75e}.account-btn{position:relative}.avatar-dot{position:absolute;left:27px;top:2px;width:11px;height:11px;border-radius:50%;background:var(--c-gift);box-shadow:0 0 0 2px var(--color-bg)}.account-badge.reward{background:color-mix(in srgb,var(--c-gift) 16%,transparent);color:var(--c-gift);white-space:nowrap}.reward-banner{all:unset;box-sizing:border-box;display:grid;grid-template-columns:auto minmax(0,1fr);gap:14px;align-items:center;padding:14px 16px;border:2px solid var(--c-gift);background:color-mix(in srgb,var(--c-gift) 9%,var(--color-bg))}.reward-banner.link{cursor:pointer}.reward-banner.link:hover{background:color-mix(in srgb,var(--c-gift) 14%,var(--color-bg))}.reward-banner.link:focus-visible{outline:2px solid var(--c-gift);outline-offset:2px}.reward-icon{width:44px;height:44px;display:inline-flex;align-items:center;justify-content:center;background:var(--c-gift);color:#fff}:root[data-theme=dark] .reward-icon{color:#161514}@media (prefers-color-scheme: dark){:root:not([data-theme=light]) .reward-icon{color:#161514}}.reward-k{font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--c-gift)}.reward-v{font-size:17px;line-height:1.3}.reward-note{font-size:13px;opacity:.75}.reward-badge{border-color:var(--c-gift);background:color-mix(in srgb,var(--c-gift) 10%,transparent)}.reward-badge svg{color:var(--c-gift)}.price-was{opacity:.6;font-weight:400}.price-now{color:var(--c-gift)}.btn-primary .price-now{color:inherit}.referral-code-box{padding:16px;background:var(--color-surface)}.referral-code{font-family:var(--font-heading);font-weight:800;font-size:32px;letter-spacing:.12em}.referral-link{font-size:15px;overflow-wrap:anywhere;min-width:0}.referral-steps{margin:0;padding-left:22px;display:flex;flex-direction:column;gap:6px;font-size:15px}.reward-status.available{background:color-mix(in srgb,var(--c-gift) 16%,transparent);color:var(--c-gift)}.reward-status.used{background:var(--color-neutral-100);color:var(--color-neutral-800)}.reward-status.revoked{border:1px solid var(--color-divider);opacity:.7}.feedback-dialog{width:min(520px,100%)}.feedback-dialog .seg{flex-wrap:wrap}.feedback-thumb{width:96px;height:72px;object-fit:cover;border:1px solid var(--color-divider)}.feedback-item{display:flex;flex-direction:column;gap:10px;padding:14px 16px;background:var(--color-surface);border-left:4px solid var(--color-divider)}.feedback-item.new{border-left-color:var(--color-accent)}.feedback-msg{white-space:pre-wrap;overflow-wrap:anywhere;font-size:15px;line-height:1.55}.feedback-shot img{max-width:min(420px,100%);max-height:320px;object-fit:contain;border:1px solid var(--color-divider)}.feedback-kind.bug{background:color-mix(in srgb,var(--hard) 14%,transparent);color:var(--hard)}.feedback-kind.idea{background:color-mix(in srgb,var(--c-overview) 14%,transparent);color:var(--c-overview)}.feedback-kind.other{background:var(--color-neutral-100);color:var(--color-neutral-800)}.reward-banner.tester{border-color:var(--c-sheet);background:color-mix(in srgb,var(--c-sheet) 9%,var(--color-bg))}.reward-banner.tester .reward-icon{background:var(--c-sheet)}.reward-banner.tester .reward-k{color:var(--c-sheet)}.account-badge.tester{background:color-mix(in srgb,var(--c-sheet) 16%,transparent);color:var(--c-sheet);white-space:nowrap}.price-free{color:var(--c-sheet)}.unlock-box.tester{border-color:var(--c-sheet)}.unlock-box.tester>.row svg{color:var(--c-sheet)}.tester-btn{background:var(--c-sheet);color:#fff}.tester-btn:hover{background:color-mix(in srgb,var(--c-sheet) 85%,#000)}:root[data-theme=dark] .tester-btn{color:#161514}@media (prefers-color-scheme: dark){:root:not([data-theme=light]) .tester-btn{color:#161514}}.tester-code{display:flex;flex-direction:column;gap:8px;padding:12px 14px;background:var(--color-surface);border-left:4px solid var(--color-divider)}.tester-code.on{border-left-color:var(--c-sheet)}.tester-code-name{font-family:var(--font-heading);font-weight:800;font-size:18px;letter-spacing:.06em}.tester-state.on{background:color-mix(in srgb,var(--c-sheet) 16%,transparent);color:var(--c-sheet)}.tester-state.off,.tester-state.expired,.tester-state.used-up{background:var(--color-neutral-100);color:var(--color-neutral-800)}.avatar-dot.tester{background:var(--c-sheet)}.code-cell{font-size:13px;font-weight:600;white-space:nowrap}.code-cell.tester{color:var(--c-sheet)}.code-cell.friend{color:var(--c-gift)}.code-facts{margin:0;display:grid;grid-template-columns:max-content minmax(0,1fr);gap:6px 16px;font-size:14px}.code-facts>div{display:contents}.code-facts dt{color:color-mix(in srgb,var(--color-text) 65%,transparent)}.code-facts dd{margin:0;min-width:0;overflow-wrap:anywhere}.credit-row>.btn-link{justify-self:start;text-align:left}.tour{position:fixed;top:0;right:0;bottom:0;left:0;z-index:300}.tour-block{position:absolute;top:0;right:0;bottom:0;left:0}.tour-dim{position:absolute;top:0;right:0;bottom:0;left:0;background:#0000008c}.tour-spot{position:fixed;box-shadow:0 0 0 200vmax #0000008c;outline:3px solid var(--color-accent);outline-offset:0;pointer-events:none}html.touring,html.touring body{overflow:hidden;overscroll-behavior:none}.tour{touch-action:none}:root{--tour-card: #ffffff}@media (prefers-color-scheme: dark){:root:not([data-theme=light]){--tour-card: #34312f}}:root[data-theme=dark]{--tour-card: #34312f}.tour-card{position:fixed;display:flex;flex-direction:column;gap:8px;padding:18px 18px 14px;background:var(--tour-card);color:var(--color-text);border:2px solid var(--color-text);border-top:6px solid var(--color-accent);box-shadow:0 14px 44px #00000080;max-width:calc(100vw - 24px)}.tour-count{font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--color-accent-700)}.tour-title{margin:0;font-size:20px}.tour-body{margin:0;font-size:15px;line-height:1.5}.tour-actions{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-top:6px;flex-wrap:wrap}.part-thread{border:1px solid var(--color-border, color-mix(in srgb, var(--color-text) 15%, transparent));background:var(--color-bg)}.part-thread>summary{cursor:pointer;list-style:none;display:flex;align-items:center;gap:8px;padding:10px 12px;font-size:14px;font-weight:600}.part-thread>summary::-webkit-details-marker{display:none}.part-thread>summary:after{content:"";margin-left:auto;width:7px;height:7px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg);transition:transform .15s}.part-thread[open]>summary:after{transform:rotate(-135deg)}.part-thread-body{padding:4px 12px 12px}.first-pick{padding:18px 20px;border:2px solid var(--color-accent);background:var(--color-surface)}.my-courses-empty{margin:0;padding:16px;border:1.5px dashed color-mix(in srgb,var(--color-text) 25%,transparent);font-size:15px}.refund-box{padding:12px 14px;border:1.5px dashed color-mix(in srgb,var(--color-text) 30%,transparent)}.credits-area{display:flex;flex-direction:column}.credits-area .credits-card{border-top:none}.ask-card{all:unset;box-sizing:border-box;cursor:pointer;display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:14px;align-items:center;padding:16px;background:var(--c-tutor);color:#fff;border:2px solid var(--c-tutor)}.ask-card:hover{background:color-mix(in srgb,var(--c-tutor) 88%,#000)}.ask-card:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.ask-card-icon{width:44px;height:44px;display:inline-flex;align-items:center;justify-content:center;border:2px solid currentColor}.ask-card-title{font-family:var(--font-heading);font-size:20px;font-weight:800}.ask-card-note{font-size:14px;line-height:1.4;opacity:.92}:root[data-theme=dark] .ask-card{color:#161514}@media (prefers-color-scheme: dark){:root:not([data-theme=light]) .ask-card{color:#161514}}.ask-user{align-self:flex-end;align-items:flex-end;max-width:85%}.ask-user .msg-user{max-width:100%}.ask-photo{max-width:min(320px,100%);max-height:320px;object-fit:contain;border:2px solid var(--color-divider);background:var(--color-surface)}.ask-box{padding:14px;background:var(--color-surface);border-left:2px solid var(--c-tutor)}.ask-title{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.char-count{font-size:13px;color:color-mix(in srgb,var(--color-text) 65%,transparent)}.char-count.over{color:var(--color-accent-700, var(--color-accent));font-weight:600}.ask-history{all:unset;box-sizing:border-box;cursor:pointer;display:grid;grid-template-columns:auto 1fr auto;gap:10px;align-items:center;padding:11px 16px;font-size:15px;font-weight:700;color:var(--c-tutor);border:2px solid var(--c-tutor);border-top:none;background:color-mix(in srgb,var(--c-tutor) 4%,var(--color-bg))}.ask-history:hover{background:color-mix(in srgb,var(--c-tutor) 10%,var(--color-bg))}.ask-history:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.declined-note{font-size:13px;color:color-mix(in srgb,var(--color-text) 65%,transparent)}.welcome-item{display:grid;grid-template-columns:auto 1fr;gap:14px;align-items:start;padding:16px;background:var(--color-surface);border-left:3px solid var(--c-sheet);font-size:15px;line-height:1.5}.welcome-icon{width:40px;height:40px;display:inline-flex;align-items:center;justify-content:center;color:var(--c-sheet);border:2px solid currentColor}.tester-welcome-toggle{font-size:13px}.tag-pending{border:1.5px dashed color-mix(in srgb,var(--color-text) 40%,transparent);color:color-mix(in srgb,var(--color-text) 70%,transparent)}.rest-box{padding:16px;border:1.5px dashed color-mix(in srgb,var(--color-text) 30%,transparent)}.my-report{display:flex;flex-direction:column;gap:8px;padding:14px 16px;background:var(--color-surface);border-left:3px solid color-mix(in srgb,var(--color-text) 25%,transparent)}.my-report.unread{border-left-color:var(--color-accent)}.my-report-msg{white-space:pre-wrap;font-size:15px;line-height:1.5}.my-report-status.resolved,.my-report-status.fixed,.my-report-status.removed{color:var(--easy);border-color:var(--easy)}.my-report-reply{padding:10px 12px;background:var(--color-bg);border-left:3px solid var(--c-tutor);font-size:15px;line-height:1.5;white-space:pre-wrap}.my-report-reply-k{display:block;font-size:12px;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:var(--c-tutor);margin-bottom:4px}.reply-box{display:flex;flex-direction:column;gap:8px}.reply-box textarea{min-height:72px}.report-msg{display:flex;flex-direction:column;gap:4px;padding:10px 12px;font-size:15px;line-height:1.5;white-space:pre-wrap;background:var(--color-bg)}.report-msg.admin{border-left:3px solid var(--c-tutor)}.report-msg.user{border-left:3px solid color-mix(in srgb,var(--color-text) 35%,transparent)}.report-msg-k{font-size:12px;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:color-mix(in srgb,var(--color-text) 60%,transparent)}.report-msg.admin .report-msg-k{color:var(--c-tutor)}.report-msg-photo{max-width:min(260px,100%);max-height:260px;object-fit:contain;border:2px solid var(--color-divider)}.answer-box{padding:12px;border:1.5px dashed var(--c-tutor)}.cell-email{font-size:12px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.user-email{font-size:15px;overflow-wrap:anywhere}.bg-job{padding-top:10px;border-top:1px solid var(--color-divider)}.bg-job:first-of-type{border-top:none;padding-top:0}.funnel{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px}.funnel-step{display:flex;flex-direction:column;gap:4px;padding:12px 14px;background:var(--color-surface)}.funnel-n{font-family:var(--font-heading);font-size:28px;font-weight:800;line-height:1}.funnel-k{font-size:13px;font-weight:600}.data-table .right,.data-table th.right{text-align:right}.funnel-step .bar{flex:none;height:6px;margin-top:auto}.fz-visitors{background:color-mix(in srgb,var(--color-text) 35%,transparent)}.fz-guests{background:#ff8a3c}.fz-guest_enrolled{background:#ffc93c}.fz-signup_views{background:var(--c-overview)}.fz-submitted{background:var(--c-quiz)}.fz-confirmed{background:var(--easy)}.funnel-table tr.clickable{cursor:pointer}.funnel-table tr.clickable:hover td{background:color-mix(in srgb,var(--color-text) 5%,transparent)}.funnel-table tr.picked td{background:color-mix(in srgb,var(--color-accent) 10%,transparent)}.fz-mobile{background:var(--c-tutor)}.fz-desktop{background:var(--c-overview)}.brand-by{font-weight:500;font-size:.8em;color:color-mix(in srgb,var(--color-text) 60%,transparent)}.signup-hero{display:flex;flex-direction:column;gap:12px;padding:20px;border:2px solid var(--color-accent);background:linear-gradient(135deg,color-mix(in srgb,var(--color-accent) 14%,var(--color-bg)),color-mix(in srgb,var(--c-tutor) 10%,var(--color-bg)));overflow:hidden}.signup-hero.tester{border-color:var(--c-sheet);background:linear-gradient(135deg,color-mix(in srgb,var(--c-sheet) 18%,var(--color-bg)),color-mix(in srgb,var(--c-gift, var(--medium)) 14%,var(--color-bg)))}.signup-badge{align-self:flex-start;display:inline-flex;align-items:center;gap:6px;padding:4px 10px;font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;background:var(--color-text);color:var(--color-bg)}.signup-big{margin:0;font-family:var(--font-heading);font-size:clamp(26px,7vw,36px);font-weight:800;line-height:1.1}.signup-free{color:var(--c-sheet);background:color-mix(in srgb,var(--c-sheet) 15%,transparent);padding:0 6px}.signup-sub{margin:0;font-size:16px;line-height:1.5}.signup-sub s{opacity:.6}.signup-perks{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px;font-size:15px;line-height:1.45}.signup-perks li{display:grid;grid-template-columns:auto 1fr;gap:10px;align-items:start}.signup-perks svg{margin-top:2px;color:var(--color-accent)}.signup-ribbon{margin:2px -20px;overflow:hidden;-webkit-mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent);mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent)}.signup-ribbon-track{display:flex;gap:8px;width:max-content;animation:signup-scroll 40s linear infinite}.signup-chip{white-space:nowrap;font-size:13px;font-weight:700;padding:6px 10px;background:var(--color-bg);border:1.5px solid color-mix(in srgb,var(--color-text) 25%,transparent)}@keyframes signup-scroll{to{transform:translate(-50%)}}@media (prefers-reduced-motion: reduce){.signup-ribbon-track{animation:none;flex-wrap:wrap;width:auto}.signup-ribbon{-webkit-mask-image:none;mask-image:none;margin:0}}.google-btn{justify-content:center;gap:10px}.google-btn.btn-primary{justify-content:center;min-width:0;width:100%}.google-logo{display:inline-flex;padding:4px;background:#fff}.code-label{font-weight:600;font-size:15px}.code-input{font-size:18px;letter-spacing:.08em;text-transform:uppercase}.code-ok{color:#16a34a;font-weight:600;font-size:14px}.code-bad{color:var(--color-accent);font-size:14px}.early-banner{position:relative;overflow:hidden;display:flex;flex-direction:column;gap:14px;align-items:flex-start;padding:32px 24px;background:linear-gradient(120deg,#ff563c,#ff8a3c 45%,#ffc93c);background-size:200% 200%;animation:early-shift 8s ease-in-out infinite;color:#1a1210}.early-banner .signup-badge{background:#1a1210;color:#fff}.early-big{margin:0;font-size:clamp(32px,7vw,52px);line-height:1.05;font-weight:900;letter-spacing:-.02em}.early-hl{background:#1a1210;color:#ffc93c;padding:0 8px}.early-sub{margin:0;font-size:18px;font-weight:600;max-width:520px}.early-spark{position:absolute;color:#fff;opacity:.85;animation:early-twinkle 2.4s ease-in-out infinite;pointer-events:none}.early-spark.s1{top:14px;right:22px;font-size:30px}.early-spark.s2{top:58px;right:70px;font-size:16px;animation-delay:.8s}.early-spark.s3{bottom:18px;right:34px;font-size:22px;animation-delay:1.5s}.early-gift{display:grid;grid-template-columns:auto 1fr;gap:16px;align-items:start;padding:20px;background:var(--color-surface);border:3px solid #ff8a3c;font-size:16px;line-height:1.5}.early-gift-icon{width:52px;height:52px;display:inline-flex;align-items:center;justify-content:center;background:#ff8a3c;color:#1a1210}.early-gift-title{font-size:20px}.early-ask{font-size:15px;line-height:1.55;color:color-mix(in srgb,var(--color-text) 80%,transparent);max-width:600px}@keyframes early-shift{0%,to{background-position:0% 50%}50%{background-position:100% 50%}}@keyframes early-twinkle{0%,to{transform:scale(1) rotate(0);opacity:.85}50%{transform:scale(1.35) rotate(20deg);opacity:.4}}@media (prefers-reduced-motion: reduce){.early-banner,.early-spark{animation:none}}.how-it-works{list-style:none;margin:0;padding:16px 18px;display:grid;gap:10px;background:var(--color-surface);border-left:4px solid #16a34a;font-size:15px;line-height:1.45}.how-it-works li{display:grid;grid-template-columns:auto 1fr;gap:10px;align-items:start}.how-it-works li>svg{margin-top:2px;color:#16a34a}.how-it-works li:last-child>svg{color:var(--color-accent)}.free-note{display:inline-flex;gap:6px;align-items:flex-start;font-size:14px;color:#16a34a;font-weight:600}.early-banner.plain{background:linear-gradient(120deg,#2b6cb0,#3c9cff,#5ad1c8);background-size:200% 200%;color:#fff}.early-banner.plain .early-hl{background:#fff;color:#2b6cb0}.early-banner.plain .signup-badge{background:#fff;color:#1a1210}.guest-nav{margin-left:auto;align-items:center}.guest-nav .btn{white-space:nowrap}.guest-card{display:grid;grid-template-columns:auto 1fr;gap:14px;align-items:start;text-align:left;padding:18px;border:3px solid #ff8a3c;background:color-mix(in srgb,#ff8a3c 10%,var(--color-surface));color:inherit;font:inherit;cursor:pointer;width:100%}.guest-card-icon{width:46px;height:46px;display:inline-flex;align-items:center;justify-content:center;background:#ff8a3c;color:#1a1210}.guest-card-k{font-size:13px;font-weight:700;text-transform:uppercase;letter-spacing:.05em}.guest-card-v{font-size:18px;line-height:1.3}.guest-card-note{font-size:14px;color:color-mix(in srgb,var(--color-text) 75%,transparent)}.guest-card-cta{grid-column:2;display:inline-flex;align-items:center;gap:4px;font-weight:800;color:var(--color-accent)}@media (max-width: 520px){.guest-nav .guest-signin{display:none}.app-nav:has(.guest-nav) .brand-by{display:none}.app-nav:has(.guest-nav) .nav-home-label{display:none}}.or-line{display:flex;align-items:center;gap:12px;color:color-mix(in srgb,var(--color-text) 55%,transparent);font-size:14px;font-weight:600;text-transform:uppercase;letter-spacing:.08em}.or-line:before,.or-line:after{content:"";flex:1;border-top:1px solid var(--color-divider)}.guest-btn{justify-content:center;gap:6px;font-weight:800;background:var(--color-text);color:var(--color-bg);border:3px solid var(--color-text)}.guest-btn:hover:not(:disabled){background:color-mix(in srgb,var(--color-text) 85%,var(--color-accent));color:var(--color-bg)}.guest-btn-note{margin-top:-4px}.guest-top{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;width:100%;padding:14px 16px;cursor:pointer;background:var(--color-text);color:var(--color-bg);border:none;font:inherit;font-size:14px;text-align:left}.guest-top b{font-size:16px}.guest-top-cta{display:inline-flex;align-items:center;gap:4px;font-weight:800;font-size:15px;color:#ffc93c;white-space:nowrap}.code-box{padding:16px;background:var(--color-surface);border:2px dashed color-mix(in srgb,var(--color-text) 35%,transparent)}.code-row .code-input{flex:1;min-width:0}.splash{gap:56px;max-width:760px;margin:0 auto;padding-bottom:32px}.splash-hero{position:relative;overflow:hidden;display:flex;flex-direction:column;gap:18px;align-items:flex-start;padding:28px 22px 24px;background:linear-gradient(150deg,color-mix(in srgb,#ff563c 16%,var(--color-bg)) 0%,var(--color-bg) 55%,color-mix(in srgb,#3c9cff 14%,var(--color-bg)) 100%);border:2px solid var(--color-text)}.splash-glow{position:absolute;width:320px;height:320px;right:-120px;top:-140px;border-radius:50%;pointer-events:none;background:radial-gradient(circle,color-mix(in srgb,#ffc93c 55%,transparent),transparent 70%);animation:early-twinkle 6s ease-in-out infinite}.splash-title{margin:0;font-size:clamp(36px,9vw,64px);line-height:1.02;font-weight:900;letter-spacing:-.03em;position:relative}.splash-hl{background:linear-gradient(90deg,#ff563c,#ff8a3c 60%,#ffc93c);-webkit-background-clip:text;background-clip:text;color:transparent}.splash-sub{margin:0;font-size:17px;line-height:1.5;max-width:600px;position:relative}.splash-stats{display:flex;flex-wrap:wrap;gap:8px;position:relative}.splash-stats span{padding:6px 10px;border:1.5px solid color-mix(in srgb,var(--color-text) 40%,transparent);background:var(--color-bg);font-size:14px}.splash-cta{width:100%;max-width:520px;position:relative}.splash-section{display:flex;flex-direction:column;gap:14px}.splash-h2{margin:0;font-size:clamp(26px,6vw,38px);line-height:1.1;font-weight:900;letter-spacing:-.02em}.demo{display:flex;flex-direction:column;gap:10px;padding:18px;background:var(--color-surface);border:2px solid var(--color-divider)}.demo-photo{display:flex;flex-direction:column;gap:6px;padding:16px;background:#fffdf5;color:#1a1210;border:1px solid #e5dcc2;transform:rotate(-1.2deg);box-shadow:0 6px 16px #0000001f;font-family:Comic Sans MS,Bradley Hand,cursive;font-size:18px;max-width:360px}.demo-photo-tag{display:inline-flex;gap:4px;align-items:center;font:600 12px/1 system-ui,sans-serif;color:#7a6a40;text-transform:uppercase;letter-spacing:.05em}.demo-work{color:#b4261a}.demo-msg{max-width:88%;padding:12px 14px;font-size:15px;line-height:1.5}.demo-msg.me{align-self:flex-end;background:var(--color-text);color:var(--color-bg)}.demo-msg.tutor{align-self:flex-start;background:var(--color-bg);border-left:4px solid #16a34a}.demo-note{font-size:12px;color:color-mix(in srgb,var(--color-text) 60%,transparent)}.splash-steps{list-style:none;margin:0;padding:0;display:grid;gap:12px}.splash-steps li{display:grid;grid-template-columns:auto 1fr;gap:14px;align-items:start;font-size:16px;line-height:1.5}.step-n{width:36px;height:36px;display:inline-flex;align-items:center;justify-content:center;background:var(--color-accent);color:#fff;font-weight:900;font-size:18px}.splash-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px}.splash-card{display:flex;flex-direction:column;gap:6px;padding:16px;background:var(--color-surface);border-top:4px solid var(--color-accent);font-size:15px;line-height:1.45}.splash-card:nth-child(2){border-top-color:#16a34a}.splash-card:nth-child(3){border-top-color:#3c9cff}.splash-card:nth-child(4){border-top-color:#ffc93c}.splash-card svg{color:var(--color-accent)}.faq{display:flex;flex-direction:column;border-top:1px solid var(--color-divider)}.faq details{border-bottom:1px solid var(--color-divider);padding:14px 0}.faq summary{cursor:pointer;font-weight:700;font-size:16px}.faq p{margin:10px 0 0;font-size:15px;line-height:1.55}.splash-final{display:flex;flex-direction:column;gap:12px;padding:24px 22px;background:var(--color-text);color:var(--color-bg)}.splash-final .text-muted,.splash-final .muted-14{color:color-mix(in srgb,var(--color-bg) 70%,transparent)}.splash-final a{color:#ffc93c}.splash-final .guest-btn{background:var(--color-bg);color:var(--color-text);border-color:var(--color-bg)}.splash-final .or-line{color:color-mix(in srgb,var(--color-bg) 60%,transparent)}.splash-final .or-line:before,.splash-final .or-line:after{border-color:color-mix(in srgb,var(--color-bg) 30%,transparent)}.splash{width:100%;min-width:0}.splash>*{min-width:0;max-width:100%}.splash .signup-ribbon{overflow:hidden;max-width:100%}.free-offer{display:grid;grid-template-columns:auto 1fr;gap:14px;align-items:start;padding:18px;border:3px solid #ff8a3c;background:color-mix(in srgb,#ffc93c 14%,var(--color-surface));font-size:15px;line-height:1.5}.free-offer-icon{width:50px;height:50px;display:inline-flex;align-items:center;justify-content:center;background:#ff8a3c;color:#1a1210}.free-offer-title{font-size:19px;line-height:1.25}.free-offer-code{font-family:ui-monospace,Menlo,monospace;font-weight:800;padding:1px 6px;background:var(--color-text);color:#ffc93c;letter-spacing:.04em;white-space:nowrap}.banner-btn{position:relative;background:#fff;color:#1a1210;border:none;font-weight:800;display:inline-flex;align-items:center;gap:4px}.banner-btn:hover{background:#ffc93c}.banner-ask{position:relative;display:flex;flex-direction:column;gap:12px;align-items:flex-start;margin-top:4px;padding:16px;background:#ffffff29;border-left:4px solid #fff;font-size:16px;line-height:1.5}.lock-tag{display:inline-flex;align-items:center;gap:4px;margin-left:8px;padding:2px 8px;font-size:12px;font-weight:800;vertical-align:middle;background:var(--color-text);color:var(--color-bg);text-transform:uppercase;letter-spacing:.04em}.credits-area.locked .ask-card-icon,.credits-area.locked .credits-card-icon{opacity:.6}.locked-section{position:relative}.locked-content{filter:blur(5px);opacity:.55;pointer-events:none;-webkit-user-select:none;user-select:none}.locked-overlay{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;padding:20px;text-align:center;background:color-mix(in srgb,var(--color-bg) 35%,transparent);border:2px dashed color-mix(in srgb,var(--color-text) 40%,transparent);color:inherit;font:inherit;font-size:15px;line-height:1.45;cursor:pointer}.locked-overlay b{font-size:20px}.locked-overlay>span:not(.lock-tag):not(.locked-cta){max-width:360px}.locked-cta{display:inline-flex;align-items:center;gap:4px;font-weight:800;color:var(--color-accent)}.guest-start{padding:12px 14px;background:color-mix(in srgb,#3c9cff 12%,var(--color-surface));border-left:4px solid #3c9cff;font-size:15px;line-height:1.5}.fz-landing{background:color-mix(in srgb,var(--color-text) 35%,transparent)}.fz-landing_devices{background:var(--c-overview)}.fz-first_logins{background:var(--easy)}.fz-first_logins_guest{background:#ffc93c}.course-card-foot .card-leave{margin-left:auto}.mono{font-family:ui-monospace,Menlo,monospace;letter-spacing:.02em}.submit-hint{display:inline-flex;gap:6px;font-size:15px;font-weight:600;color:var(--color-accent)}
