@font-face{font-display:block;font-family:KaTeX_AMS;font-style:normal;font-weight:400;src:url(/assets/KaTeX_AMS-Regular-BQhdFMY1.woff2) format("woff2"),url(/assets/KaTeX_AMS-Regular-DMm9YOAa.woff) format("woff"),url(/assets/KaTeX_AMS-Regular-DRggAlZN.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Caligraphic;font-style:normal;font-weight:700;src:url(/assets/KaTeX_Caligraphic-Bold-Dq_IR9rO.woff2) format("woff2"),url(/assets/KaTeX_Caligraphic-Bold-BEiXGLvX.woff) format("woff"),url(/assets/KaTeX_Caligraphic-Bold-ATXxdsX0.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Caligraphic;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Caligraphic-Regular-Di6jR-x-.woff2) format("woff2"),url(/assets/KaTeX_Caligraphic-Regular-CTRA-rTL.woff) format("woff"),url(/assets/KaTeX_Caligraphic-Regular-wX97UBjC.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Fraktur;font-style:normal;font-weight:700;src:url(/assets/KaTeX_Fraktur-Bold-CL6g_b3V.woff2) format("woff2"),url(/assets/KaTeX_Fraktur-Bold-BsDP51OF.woff) format("woff"),url(/assets/KaTeX_Fraktur-Bold-BdnERNNW.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Fraktur;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Fraktur-Regular-CTYiF6lA.woff2) format("woff2"),url(/assets/KaTeX_Fraktur-Regular-Dxdc4cR9.woff) format("woff"),url(/assets/KaTeX_Fraktur-Regular-CB_wures.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:normal;font-weight:700;src:url(/assets/KaTeX_Main-Bold-Cx986IdX.woff2) format("woff2"),url(/assets/KaTeX_Main-Bold-Jm3AIy58.woff) format("woff"),url(/assets/KaTeX_Main-Bold-waoOVXN0.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:italic;font-weight:700;src:url(/assets/KaTeX_Main-BoldItalic-DxDJ3AOS.woff2) format("woff2"),url(/assets/KaTeX_Main-BoldItalic-SpSLRI95.woff) format("woff"),url(/assets/KaTeX_Main-BoldItalic-DzxPMmG6.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:italic;font-weight:400;src:url(/assets/KaTeX_Main-Italic-NWA7e6Wa.woff2) format("woff2"),url(/assets/KaTeX_Main-Italic-BMLOBm91.woff) format("woff"),url(/assets/KaTeX_Main-Italic-3WenGoN9.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Main-Regular-B22Nviop.woff2) format("woff2"),url(/assets/KaTeX_Main-Regular-Dr94JaBh.woff) format("woff"),url(/assets/KaTeX_Main-Regular-ypZvNtVU.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Math;font-style:italic;font-weight:700;src:url(/assets/KaTeX_Math-BoldItalic-CZnvNsCZ.woff2) format("woff2"),url(/assets/KaTeX_Math-BoldItalic-iY-2wyZ7.woff) format("woff"),url(/assets/KaTeX_Math-BoldItalic-B3XSjfu4.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Math;font-style:italic;font-weight:400;src:url(/assets/KaTeX_Math-Italic-t53AETM-.woff2) format("woff2"),url(/assets/KaTeX_Math-Italic-DA0__PXp.woff) format("woff"),url(/assets/KaTeX_Math-Italic-flOr_0UB.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:normal;font-weight:700;src:url(/assets/KaTeX_SansSerif-Bold-D1sUS0GD.woff2) format("woff2"),url(/assets/KaTeX_SansSerif-Bold-DbIhKOiC.woff) format("woff"),url(/assets/KaTeX_SansSerif-Bold-CFMepnvq.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:italic;font-weight:400;src:url(/assets/KaTeX_SansSerif-Italic-C3H0VqGB.woff2) format("woff2"),url(/assets/KaTeX_SansSerif-Italic-DN2j7dab.woff) format("woff"),url(/assets/KaTeX_SansSerif-Italic-YYjJ1zSn.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:normal;font-weight:400;src:url(/assets/KaTeX_SansSerif-Regular-DDBCnlJ7.woff2) format("woff2"),url(/assets/KaTeX_SansSerif-Regular-CS6fqUqJ.woff) format("woff"),url(/assets/KaTeX_SansSerif-Regular-BNo7hRIc.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Script;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Script-Regular-D3wIWfF6.woff2) format("woff2"),url(/assets/KaTeX_Script-Regular-D5yQViql.woff) format("woff"),url(/assets/KaTeX_Script-Regular-C5JkGWo-.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size1;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Size1-Regular-mCD8mA8B.woff2) format("woff2"),url(/assets/KaTeX_Size1-Regular-C195tn64.woff) format("woff"),url(/assets/KaTeX_Size1-Regular-Dbsnue_I.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size2;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Size2-Regular-Dy4dx90m.woff2) format("woff2"),url(/assets/KaTeX_Size2-Regular-oD1tc_U0.woff) format("woff"),url(/assets/KaTeX_Size2-Regular-B7gKUWhC.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size3;font-style:normal;font-weight:400;src:url(data:font/woff2;base64,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) format("woff2"),url(/assets/KaTeX_Size3-Regular-CTq5MqoE.woff) format("woff"),url(/assets/KaTeX_Size3-Regular-DgpXs0kz.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size4;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Size4-Regular-Dl5lxZxV.woff2) format("woff2"),url(/assets/KaTeX_Size4-Regular-BF-4gkZK.woff) format("woff"),url(/assets/KaTeX_Size4-Regular-DWFBv043.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Typewriter;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Typewriter-Regular-CO6r4hn1.woff2) format("woff2"),url(/assets/KaTeX_Typewriter-Regular-C0xS9mPB.woff) format("woff"),url(/assets/KaTeX_Typewriter-Regular-D3Ib7_Hf.ttf) format("truetype")}.katex{font: 1.21em KaTeX_Main,Times New Roman,serif;line-height:1.2;position:relative;text-indent:0;text-rendering:auto}.katex *{-ms-high-contrast-adjust:none!important;border-color:currentColor}.katex .katex-version:after{content:"0.17.0"}.katex .katex-mathml{border:0;-webkit-clip-path:inset(50%);clip-path:inset(50%);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 .mathsfit,.katex .textitsf{font-family:KaTeX_SansSerif;font-style:italic}.katex .mainrm{font-family:KaTeX_Main;font-style:normal}.katex .vlist-t{border-collapse:collapse;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 .smash{display:inline;line-height:0}.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;display:block;height:inherit;position:absolute;width:100%}.katex svg path{stroke:none}.katex svg{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}.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}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/inter-cyrillic-ext-wght-normal-BOeWTOD4.woff2) format("woff2-variations");unicode-range:U+0460-052F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/inter-cyrillic-wght-normal-DqGufNeO.woff2) format("woff2-variations");unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/inter-greek-ext-wght-normal-DlzME5K_.woff2) format("woff2-variations");unicode-range:U+1F00-1FFF}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/inter-greek-wght-normal-CkhJZR-_.woff2) format("woff2-variations");unicode-range:U+0370-0377,U+037A-037F,U+0384-038A,U+038C,U+038E-03A1,U+03A3-03FF}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/inter-vietnamese-wght-normal-CBcvBZtf.woff2) format("woff2-variations");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/inter-latin-ext-wght-normal-DO1Apj_S.woff2) format("woff2-variations");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/inter-latin-wght-normal-Dx4kXJAl.woff2) format("woff2-variations");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:Inter Tight Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/inter-tight-cyrillic-ext-wght-normal-okcGN4Nq.woff2) format("woff2-variations");unicode-range:U+0460-052F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:Inter Tight Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/inter-tight-cyrillic-wght-normal-BS41q_Tv.woff2) format("woff2-variations");unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}@font-face{font-family:Inter Tight Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/inter-tight-greek-ext-wght-normal-DQgQPNk4.woff2) format("woff2-variations");unicode-range:U+1F00-1FFF}@font-face{font-family:Inter Tight Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/inter-tight-greek-wght-normal-sS1B39LI.woff2) format("woff2-variations");unicode-range:U+0370-0377,U+037A-037F,U+0384-038A,U+038C,U+038E-03A1,U+03A3-03FF}@font-face{font-family:Inter Tight Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/inter-tight-vietnamese-wght-normal-TKKdAiBA.woff2) format("woff2-variations");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}@font-face{font-family:Inter Tight Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/inter-tight-latin-ext-wght-normal-B4u9PlvR.woff2) format("woff2-variations");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:Inter Tight Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/inter-tight-latin-wght-normal-DX-nOvPD.woff2) format("woff2-variations");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}:root{color-scheme:light;--ground: #F3F5F6;--paper: var(--ground);--surface: #FFFFFF;--surface-raised: #EBF1F2;--surface-sunken: #EEF1F3;--ink: #171B1E;--ink-dim: #586269;--muted: var(--ink-dim);--ink-faint: #66707A;--line: #E9EDEF;--line-strong: #D3DADE;--accent: #1B6B73;--accent-soft: #DFF0F1;--accent-dark: #145A61;--accent-ink: #F2F4F5;--accent-warm: #9A5A33;--accent-warm-soft: #F6E9E0;--marker-edge: #AEB8BF;--tutor-bubble: #E7F1F1;--danger: #B4515C;--danger-soft: #F8E6E8;--building: #8A6210;--building-soft: #F3EAD0;--fig-original: #B25E17;--fig-image: #2F6FC0;--fig-invariant: #C62828;--fig-second: #8A57CE;--fig-guess: #6C747C;--font-sans: "Inter Variable", "Inter", "Segoe UI", system-ui, sans-serif;--font-display: "Inter Tight Variable", "Inter Tight", "Space Grotesk", var(--font-sans);--font-serif: var(--font-display);--font-mono: ui-monospace, monospace;--bp-wide: 880px;--shadow-soft: 0 6px 20px rgba(30, 40, 44, .07);--shadow-lift: 0 3px 12px rgba(30, 40, 44, .07);--wash-shadow: none;--e1: none;--e2: 0 6px 20px rgba(30,40,44,.07);--ehover: 0 3px 12px rgba(30,40,44,.07);--radius-card: 20px;--radius-ctl: 14px;--radius-btn: 14px;--radius-pill: 999px;--r-card: var(--radius-card);--r-ctl: var(--radius-ctl);--r-btn: var(--radius-btn);--r-pill: var(--radius-pill);--gutter: 16px;--gap-group: 10px;--gap-section: 26px;--h1: 28px;--h1lh: 1.14;--tr: -.016em;--body: 15px;--bodylh: 1.55;--label: 13px;--wt-display: 600;--warm: var(--accent-warm);--warm-soft: var(--accent-warm-soft);--bubble: var(--tutor-bubble);--btn-primary-shadow: none;--btn-primary-shadow-hover: none;--btn-primary-shadow-active: none;--btn-primary-border: transparent;--btn-primary-hover-bg: color-mix(in srgb, var(--accent) 94%, #000);--btn-primary-active-y: 1px;--btn-secondary-bg: var(--surface);--btn-secondary-border: var(--line-strong);--btn-secondary-shadow: none;--seg-track-bg: var(--surface-sunken);--seg-track-shadow: none;--seg-thumb-bg: var(--surface);--seg-thumb-border: var(--line-strong);--seg-thumb-shadow: 0 1px 2px rgba(15,26,28,.12);--seg-active-fg: var(--accent);--chip-answer-bg: var(--surface);--chip-answer-border: var(--line-strong);--chip-answer-shadow: none;--key-bg: var(--surface);--key-border: var(--line-strong);--key-shadow: none;--field-focus-shadow: 0 0 0 1px var(--accent);--send-shadow: none;--board-border: transparent;--board-shadow: none;--board-spine-display: block;--card-raise: var(--wash-shadow)}[data-theme=dark]{color-scheme:dark;--ground: #14181A;--surface: #1D2225;--surface-raised: #232D2E;--surface-sunken: #191D20;--ink: #EAEEF0;--ink-dim: #9FA8AF;--ink-faint: #8B949D;--line: #2A3034;--line-strong: #3A4248;--accent: #6FC4CA;--accent-soft: rgba(111, 196, 202, .14);--accent-dark: #93D4D8;--accent-ink: #0F1A1C;--accent-warm: #D2925F;--accent-warm-soft: rgba(210, 146, 95, .15);--marker-edge: #5B636B;--tutor-bubble: #1E2A2B;--danger: #D07F88;--danger-soft: #33232A;--building: #E2B95B;--building-soft: #2E2915;--fig-original: #E7975A;--fig-image: #74AEEE;--fig-invariant: #F4584E;--fig-second: #BB9BF0;--fig-guess: #98A0A8;--shadow-soft: 0 8px 26px rgba(0, 0, 0, .4);--shadow-lift: 0 4px 14px rgba(0, 0, 0, .34);--wash-shadow: none;--e1: none;--e2: 0 8px 26px rgba(0,0,0,.4);--ehover: 0 4px 14px rgba(0,0,0,.34);--btn-primary-shadow: none;--btn-primary-shadow-hover: none;--btn-primary-shadow-active: none;--btn-primary-border: transparent;--btn-secondary-shadow: none;--seg-track-shadow: none;--seg-thumb-shadow: 0 1px 2px rgba(0,0,0,.5);--chip-answer-shadow: none;--key-shadow: none;--send-shadow: none;--board-shadow: none;--card-raise: var(--wash-shadow)}[data-controls=set]{--btn-primary-shadow: none;--btn-primary-shadow-hover: none;--btn-primary-shadow-active: none;--btn-primary-border: color-mix(in srgb, var(--accent) 84%, #000);--btn-primary-hover-bg: var(--accent-dark);--btn-primary-active-y: 0px;--btn-secondary-bg: transparent;--btn-secondary-border: var(--line-strong);--btn-secondary-shadow: none;--seg-track-bg: var(--surface-sunken);--seg-track-shadow: none;--seg-thumb-bg: var(--accent);--seg-thumb-border: transparent;--seg-thumb-shadow: none;--seg-active-fg: var(--accent-ink);--chip-answer-bg: var(--accent-soft);--chip-answer-border: transparent;--chip-answer-shadow: none;--key-bg: var(--surface-sunken);--key-border: var(--line);--key-shadow: none;--field-focus-shadow: none;--send-shadow: none;--board-border: var(--line-strong);--board-shadow: none;--board-spine-display: none;--card-raise: none}html{background:var(--paper)}body{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@media (prefers-color-scheme: dark){html:not([data-theme]){background:#15181b}}.tutor-root{max-width:720px;margin:0 auto;height:100dvh;display:flex;flex-direction:column;background:var(--surface);font-family:var(--font-sans);color:var(--ink)}.tutor-body{flex:1;min-height:0;display:flex;flex-direction:column;background:var(--ground)}.confirm-slot{padding:12px 14px 0}.board-region{display:flex;flex-direction:column;min-height:0}.board-region .confirm-slot{order:0}.board-region .tutor-workspace{order:1}.tutor-workspace{background:var(--paper);border-bottom:1px solid var(--line);padding:10px 16px 12px;display:flex;flex-direction:column;max-height:40dvh;overflow-y:auto}.tutor-chat{flex:1;min-height:0;display:flex;flex-direction:column}@media (min-width: 880px){.tutor-root{max-width:1100px}.tutor-body{flex-direction:row;gap:24px;padding-right:8px}.tutor-chat{flex:4 1 0;order:1;min-width:0}.board-region{flex:6 1 0;order:2;min-width:0;min-height:0;border-left:1px solid var(--line)}.board-region--split{overflow-y:auto}.tutor-workspace{flex:1 1 0;order:1;min-width:0;min-height:0;max-height:none;overflow-y:auto;border-bottom:none;border-left:none;padding:20px}.board-region--split .tutor-workspace{flex:0 0 auto;overflow:visible}.confirm-slot{flex:1 1 0;order:0;min-width:0;overflow-y:auto;padding:20px}.board-region--split .confirm-slot{flex:0 0 auto;overflow:visible}.confirm-slot .photo-confirm,.confirm-slot .photo-board{max-height:none}.ws-toggle{display:none}.ws-body.ws-collapsed{display:flex}}.ws-body{display:flex;flex-direction:column}.ws-body.ws-collapsed{display:none}.ws-card{position:relative;overflow:hidden;background:var(--surface);border:1px solid var(--board-border);border-radius:var(--radius-card);box-shadow:var(--board-shadow);padding:14px 14px 12px;display:flex;flex-direction:column;gap:6px}.ws-card .ws-row{border-bottom:1px solid var(--line);padding-bottom:6px}.ws-card .ws-segment>.ws-row:last-child{border-bottom:none;padding-bottom:0}.ws-card:before{content:"";position:absolute;top:0;left:0;bottom:0;width:3px;background:var(--accent);display:var(--board-spine-display)}.ws-card--empty{align-items:center;justify-content:center;text-align:center;min-height:128px;background-image:repeating-linear-gradient(transparent 0,transparent 31px,var(--line) 31px,var(--line) 32px)}@media (min-width: 880px){.ws-body{flex:1;min-height:0}.ws-card{flex:1 0 auto}.ws-card--empty{flex:0 0 auto;min-height:240px}}.ws-row{font-size:13px;line-height:1.4}.photo-board{font-size:13px;line-height:1.4;max-height:30dvh;overflow-y:auto;overflow-x:hidden}.photo-board-row{margin:2px 0;overflow:hidden}.photo-board-row .katex-display{margin:0;text-align:left}.photo-confirm{max-height:52dvh;overflow-y:auto}.katex{color:var(--ink)}.ws-figure{color:var(--ink);flex:1 1 auto;min-width:0}.ws-figure>svg{display:block;width:100%;height:auto}.glyph-check{border-radius:3px;padding:0 1.5px;background:var(--accent-soft)}@media (min-width: 880px){.ws-row{font-size:14.5px;line-height:1.5}.photo-board{font-size:15px;line-height:1.5;max-height:44dvh}.photo-confirm{max-height:none;overflow-y:visible}}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 18px;border-radius:var(--radius-btn);font-family:var(--font-display);font-weight:600;font-size:15px;line-height:1;white-space:nowrap;cursor:pointer;border:1px solid transparent;transition:background .15s ease,box-shadow .12s ease,border-color .15s ease,color .15s ease,transform .06s ease}@media (min-width: 880px){.btn{min-height:44px}}.btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.btn:disabled,.btn.is-disabled{cursor:default;opacity:.4;box-shadow:none;transform:none}.btn-primary{min-width:140px;background:var(--accent);color:var(--accent-ink);border:1px solid var(--btn-primary-border);box-shadow:var(--btn-primary-shadow)}.btn-primary:hover:not(:disabled){background:var(--btn-primary-hover-bg);box-shadow:var(--btn-primary-shadow-hover)}.btn-primary:active:not(:disabled){transform:translateY(1px);box-shadow:none}.btn-secondary{min-width:140px;font-weight:500;background:transparent;color:var(--ink);border:1px solid var(--ink-dim);box-shadow:none}.btn-secondary:hover:not(:disabled){background:var(--accent-soft);border-color:var(--accent);color:var(--accent)}.btn-secondary:active:not(:disabled){transform:translateY(1px)}.btn-tertiary{min-width:0;min-height:44px;padding:0 8px;background:transparent;color:var(--accent);border:none;font-weight:600}.btn-tertiary:hover:not(:disabled){color:var(--accent-dark);background:transparent}.icon-btn{width:44px;height:44px;flex:none;display:inline-flex;align-items:center;justify-content:center;background:transparent;color:var(--ink-dim);border:1px solid var(--line-strong);border-radius:var(--r-ctl);cursor:pointer;transition:background .15s ease,color .15s ease,border-color .15s ease}.icon-btn svg{width:22px;height:22px}.icon-btn:hover:not(:disabled){background:var(--accent-soft);color:var(--accent);border-color:var(--accent)}.icon-btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.icon-btn:disabled{opacity:.4;cursor:default}.chip-answer,.chip-action{font-weight:600;font-family:inherit;cursor:pointer;border-radius:999px;transition:background .15s ease,box-shadow .15s ease,border-color .15s ease,color .15s ease,transform .06s ease}.chip-answer{background:var(--chip-answer-bg);color:var(--accent);border:1px solid var(--chip-answer-border);box-shadow:var(--chip-answer-shadow)}.chip-answer:hover:not(:disabled){border-color:var(--accent);background:var(--accent-soft);transform:translateY(-1px)}.chip-action{background:transparent;color:var(--accent);border:1px solid var(--line-strong)}.chip-action:hover:not(:disabled){border-color:var(--accent);background:var(--accent-soft)}.chip-answer:focus-visible,.chip-action:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.chip-answer:disabled,.chip-action:disabled{cursor:default;opacity:.6}@media (prefers-reduced-motion: reduce){.chip-answer:hover:not(:disabled){transform:none}}.mode-toggle{display:flex;padding:2px;border-radius:999px;background:var(--seg-track-bg);box-shadow:var(--seg-track-shadow)}.mode-seg{font-size:12px;font-weight:600;padding:5px 11px;border-radius:999px;border:1px solid transparent;background:transparent;color:var(--ink-dim);cursor:pointer;font-family:inherit;white-space:nowrap;transition:background .15s ease,color .15s ease,box-shadow .15s ease,border-color .15s ease}.mode-seg[aria-pressed=true]{background:var(--seg-thumb-bg);border-color:var(--seg-thumb-border);box-shadow:var(--seg-thumb-shadow);color:var(--seg-active-fg)}.mode-seg:focus-visible{outline:2px solid var(--accent);outline-offset:2px}@media (prefers-reduced-motion: reduce){.mode-seg{transition:color .15s ease,background .15s ease}}.topic-card{display:flex;justify-content:space-between;align-items:center;gap:12px;width:100%;text-align:left;padding:15px 16px;border:1px solid var(--line);border-radius:var(--radius-card);background:var(--surface);box-shadow:var(--shadow-soft);color:var(--ink);font-family:inherit;cursor:pointer;margin-bottom:10px;transition:box-shadow .15s ease,border-color .15s ease,transform .1s ease}.topic-card:hover:not(:disabled){box-shadow:var(--shadow-lift);border-color:var(--accent);transform:translateY(-1px)}.topic-card:active:not(:disabled){transform:translateY(0);box-shadow:var(--shadow-soft)}.topic-card:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.topic-card:disabled{cursor:default;opacity:.6}.topic-card .topic-arrow{color:var(--muted);transition:color .15s ease,transform .15s ease}.topic-card:hover .topic-arrow{color:var(--accent);transform:translate(2px)}.home{max-width:620px;margin:0 auto;padding:18px 20px 20px;box-sizing:border-box;height:100dvh;display:flex;flex-direction:column;overflow:hidden}@media (min-width: 880px){.home{max-width:640px;padding-top:40px}}.home-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}.wordmark{font-family:var(--font-display);font-size:15px;font-weight:700;letter-spacing:-.01em;color:var(--accent-warm)}.home-h1{font-family:var(--font-display);font-weight:600;font-size:28px;line-height:1.14;letter-spacing:-.016em;color:var(--ink);margin:0;max-width:20ch;text-wrap:balance}@media (min-width: 880px){.home-h1{font-size:32px}}.home-primary{margin-top:20px}.home-upload{width:100%}@media (min-width: 880px){.home-upload{width:auto}}.upload-help{font-size:14px;color:var(--ink-dim);margin:10px 2px 0;line-height:1.5}.home-rule{border:0;height:1px;background:var(--line);margin:32px 0 20px}.home-error{margin:0 0 16px;padding:12px 14px;border:1px solid var(--line);border-radius:8px;background:var(--danger-soft);color:var(--ink);font-size:14px}.home-resume{margin:16px 18px 0}.home-progress{width:100%;margin-top:20px}@media (min-width: 880px){.home-progress{width:auto}}.home-greet{font-family:var(--font-display);font-weight:600;font-size:28px;line-height:1.14;letter-spacing:-.016em;color:var(--ink);margin:2px 0 6px;max-width:20ch;text-wrap:balance}@media (min-width: 880px){.home-greet{font-size:32px}}.home-sub{font-size:14px;color:var(--ink-dim);line-height:1.5;margin:0 0 16px;max-width:42ch}.home-entry{margin-top:2px}.home-composer{background:var(--surface);border:1px solid transparent;border-radius:var(--radius-card);overflow:hidden;transition:border-color .15s ease,box-shadow .15s ease}.home-composer:focus-within{border-color:var(--accent);box-shadow:var(--field-focus-shadow)}.home-composer-field{display:block;width:100%;box-sizing:border-box;border:0;background:transparent;resize:none;outline:none;color:var(--ink);font-family:inherit;font-size:15px;line-height:1.45;padding:15px 16px 6px;min-height:58px}.home-composer-field::placeholder{color:var(--ink-faint)}.home-composer-bar{display:flex;align-items:center;gap:10px;padding:8px 10px 10px 12px}.home-composer-cam{flex:none;width:34px;height:34px;display:inline-flex;align-items:center;justify-content:center;border-radius:var(--radius-ctl);background:var(--surface-sunken);border:1px solid var(--line);color:var(--ink-dim);cursor:pointer;transition:border-color .15s ease,color .15s ease,background .15s ease}.home-composer-cam:hover:not(:disabled){border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}.home-composer-cam:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.home-composer-cam:disabled{opacity:.5;cursor:default}.home-composer-hint{flex:1;min-width:0;font-size:12.5px;color:var(--ink-faint);display:inline-flex;align-items:center;gap:8px}.home-composer-spring{flex:1}.home-composer-send{flex:none;width:34px;height:34px;display:inline-flex;align-items:center;justify-content:center;border-radius:var(--radius-pill);background:var(--accent);color:var(--accent-ink);border:0;cursor:pointer;box-shadow:var(--send-shadow);transition:opacity .15s ease}.home-composer-send:disabled{opacity:.4;cursor:default;box-shadow:none}.home-composer-send:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.starter-chip{font-family:var(--font-sans);font-size:13px;font-weight:500;color:var(--ink-dim);background:var(--surface);border:1px solid var(--line-strong);border-radius:var(--radius-pill);padding:8px 13px;cursor:pointer;transition:border-color .15s ease,background .15s ease,color .15s ease}.starter-chip:hover:not(:disabled){border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}.starter-chip:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.starter-chip:disabled{opacity:.5;cursor:default}.topic-list-wrap{position:relative;margin-top:4px;flex:1 1 auto;min-height:0;display:flex;flex-direction:column}.topic-list{flex:1 1 auto;min-height:0;overflow-y:auto;overscroll-behavior:contain;scrollbar-gutter:stable}.topic-list-wrap:after{content:"";position:absolute;left:0;right:0;bottom:0;height:28px;background:linear-gradient(to bottom,transparent,var(--ground));pointer-events:none;opacity:0;transition:opacity .15s ease}.topic-list-wrap[data-more=true]:after{opacity:1}.topic-empty{padding:18px 4px;color:var(--ink-dim);font-size:14px;line-height:1.6}.topic-row{position:relative;overflow:hidden;box-sizing:border-box;display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%;text-align:left;padding:0 4px;min-height:56px;background:transparent;border:0;border-top:1px solid var(--line);color:var(--ink);font-family:inherit;cursor:pointer;transition:background .15s ease-out,transform .15s ease-out}@media (min-width: 880px){.topic-row{min-height:60px}}.topic-row:before{content:"";position:absolute;left:0;top:0;bottom:0;width:2px;background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform .08s ease-out}.topic-row:first-child{border-top:none}.topic-row:hover:not(:disabled){background:var(--surface-raised);transform:translate(1px)}.topic-row:hover:not(:disabled):before{transform:scaleX(1)}.topic-row:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}.topic-row:disabled{cursor:default;opacity:.55}.topic-row .name{font-family:var(--font-display);font-size:17px;font-weight:500;text-transform:capitalize}.topic-row .topic-arrow{color:var(--ink-dim);display:inline-flex;transition:color .15s ease-out,transform .15s ease-out}.topic-row:hover:not(:disabled) .topic-arrow{color:var(--accent);transform:translate(2px)}.picker-card{position:relative;display:flex;align-items:flex-start;justify-content:space-between;gap:10px;width:100%;text-align:left;padding:13px 14px;border-radius:12px;background:var(--surface);border:1px solid var(--line);color:var(--ink);font-family:inherit;cursor:pointer;transition:background .15s ease-out,transform .15s ease-out,box-shadow .15s ease-out,border-color .15s ease-out}.picker-card:before{content:"";position:absolute;left:0;top:8px;bottom:8px;width:2px;border-radius:2px;background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform .08s ease-out}.picker-card.suggested{border-color:var(--accent)}.picker-card:hover:not(:disabled){background:var(--surface-raised);transform:translate(1px);box-shadow:var(--shadow-soft)}.picker-card:hover:not(:disabled):before{transform:scaleX(1)}.picker-card:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.picker-card:disabled{cursor:default;opacity:.6}.picker-card>span:not(:first-child){margin-top:2px}.picker-card>svg{flex-shrink:0;margin-top:3px}@media (min-width: 880px){.home{padding-top:48px}}@media (prefers-reduced-motion: reduce){.topic-row,.topic-row .topic-arrow,.topic-row:before,.picker-card,.picker-card:before{transition:none}.topic-row:hover:not(:disabled),.picker-card:hover:not(:disabled){transform:none}.topic-row:hover:not(:disabled) .topic-arrow{transform:none}}.spinner{width:14px;height:14px;flex:none;border-radius:50%;border:2px solid currentColor;border-top-color:transparent;display:inline-block;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media (prefers-reduced-motion: reduce){.spinner{animation:none;opacity:.5}}.symbol-key{font-size:14px;font-family:var(--font-mono);padding:5px 10px;border-radius:var(--r-ctl);border:1px solid var(--key-border);background:var(--key-bg);color:var(--ink);box-shadow:var(--key-shadow);cursor:pointer;flex-shrink:0;transition:border-color .15s ease,background .15s ease,box-shadow .15s ease}.symbol-key:hover{border-color:var(--accent);background:var(--accent-soft)}.symbol-key:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.chat-input{border:1px solid var(--line);background:var(--paper);outline:none;transition:border-color .15s ease,box-shadow .15s ease}.chat-input:focus{border-color:var(--accent);box-shadow:var(--field-focus-shadow)}@media (prefers-reduced-motion: reduce){.btn,.icon-btn,.topic-card,.topic-card .topic-arrow,.symbol-key,.chat-input{transition:none}.btn:active:not(:disabled),.topic-card:hover:not(:disabled){transform:none}}@keyframes ws-row-in{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.ws-row{animation:ws-row-in .22s ease-out}@media (prefers-reduced-motion: reduce){.ws-row{animation:none}}.stream-caret{margin-left:1px;color:var(--accent);opacity:.7;animation:stream-blink 1s steps(2,start) infinite}@keyframes stream-blink{to{opacity:0}}@media (prefers-reduced-motion: reduce){.stream-caret{animation:none}}:root{--picker-row-h: 46px;--picker-rows: 6.5;--picker-panel-h: calc(var(--picker-rows) * var(--picker-row-h))}@media (min-width: 720px){:root{--picker-rows: 8.5}}.course-select{position:relative;margin:0 0 4px}.course-tile{width:100%;box-sizing:border-box;display:flex;align-items:center;gap:12px;min-height:52px;padding:0 13px;-webkit-appearance:none;-moz-appearance:none;appearance:none;cursor:pointer;font-family:inherit;text-align:left;background:var(--surface);color:var(--ink);border:1px solid var(--line);border-radius:var(--radius-ctl);transition:background .15s ease-out,border-color .15s ease-out}.course-tile:hover{background:var(--surface-raised)}.course-tile:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.course-mark{flex:none;width:36px;height:36px;border-radius:8px;display:inline-flex;align-items:center;justify-content:center;background:var(--accent-warm-soft);color:var(--accent-warm);font-family:var(--font-display);font-size:17px;line-height:1}.course-name{font-family:var(--font-display);font-weight:600;font-size:16px;letter-spacing:-.01em;color:var(--ink);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.course-count{margin-left:auto;flex:none;font-size:12.5px;color:var(--ink-dim)}.course-chevron{flex:none;width:8px;height:8px;margin:-3px 2px 0;border-right:1.5px solid var(--ink-dim);border-bottom:1.5px solid var(--ink-dim);transform:rotate(45deg);transition:transform .18s ease-out}.course-select.is-open .course-chevron{transform:rotate(-135deg);margin-top:2px}.course-popover{position:absolute;top:calc(100% + 6px);left:0;right:0;z-index:40;list-style:none;margin:0;padding:0;background:var(--surface);border:1px solid var(--line);border-radius:8px;box-shadow:var(--card-raise);max-height:312px;overflow-y:auto}.course-option{width:100%;box-sizing:border-box;display:flex;align-items:center;gap:12px;min-height:52px;padding:0 12px;-webkit-appearance:none;-moz-appearance:none;appearance:none;cursor:pointer;font-family:inherit;text-align:left;background:transparent;color:var(--ink);border:0;border-top:1px solid var(--line);border-left:3px solid transparent;transition:background .15s ease-out}.course-popover li:first-child .course-option{border-top:none}.course-option:hover{background:var(--surface-raised)}.course-option:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}.course-option[aria-current=true]{border-left-color:var(--accent);background:var(--accent-soft)}.course-option[aria-current=true] .course-name{color:var(--accent)}@media (prefers-reduced-motion: reduce){.course-chevron{transition:none}}.topic-filter{position:relative;margin:12px 0 10px}.topic-filter .glyph{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--ink-faint);pointer-events:none;display:inline-flex}.topic-filter input{width:100%;box-sizing:border-box;font-family:inherit;font-size:14.5px;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);padding:10px 12px 10px 36px}.topic-filter input::placeholder{color:var(--ink-faint)}.topic-filter input:focus-visible{outline:2px solid var(--accent);outline-offset:-1px}@media (prefers-reduced-motion: reduce){.topic-row,.topic-row:before,.topic-row .topic-arrow{transition:none!important}.topic-row:hover:not(:disabled){transform:none}.topic-row:hover:not(:disabled):before{transform:scaleX(0)}.topic-row:hover:not(:disabled) .topic-arrow{transform:none}}.verify-note{order:2;flex:0 0 auto;display:flex;gap:10px;align-items:flex-start;margin:10px 16px 0;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:var(--paper)}.verify-note-body{font-size:12.5px;line-height:1.5;color:var(--ink-dim);font-family:var(--font-serif);flex:1}.verify-note-dismiss{border:none;background:none;cursor:pointer;padding:0 2px;color:var(--ink-faint);font-size:12.5px;font-family:inherit;flex-shrink:0}@media (min-width: 900px){.verify-note{margin:0 0 12px}}.typing-dot{width:6px;height:6px;border-radius:50%;background:var(--ink-dim);opacity:.35;animation:typing-pulse 1.2s ease-in-out infinite}.typing-dot:nth-child(2){animation-delay:.18s}.typing-dot:nth-child(3){animation-delay:.36s}@keyframes typing-pulse{0%,60%,to{opacity:.35;transform:translateY(0)}30%{opacity:.9;transform:translateY(-2px)}}@media (prefers-reduced-motion: reduce){.typing-dot{animation:none;opacity:.55}}.session-header{display:grid;grid-template-columns:minmax(0,1fr) auto;grid-template-areas:"course session" "context context";align-items:center;row-gap:7px;column-gap:10px;padding:10px 16px 9px;border-bottom:1px solid var(--line)}.sh-course{grid-area:course}.sh-session{grid-area:session;display:flex;align-items:center;gap:8px;justify-self:end}.sh-context{grid-area:context;display:flex;align-items:center;gap:10px;min-width:0}.sh-goal{flex:1;min-width:0}.sh-rail{display:flex;align-items:center;gap:4px;margin-left:auto;flex-shrink:0}.session-header .course-short{display:none}@media (max-width: 559px){.session-header .course-full{display:none}.session-header .course-short{display:inline}}@media (min-width: 880px){.session-header{grid-template-columns:auto minmax(0,1fr) auto;grid-template-areas:"course context session";column-gap:14px}}.btn-feedback{display:inline-flex;align-items:center;gap:5px;font-family:inherit;font-size:12px;font-weight:600;color:var(--accent);background:transparent;border:none;border-radius:999px;padding:4px 10px;cursor:pointer;white-space:nowrap;transition:background .15s ease-out}.btn-feedback:hover{background:var(--accent-soft)}.btn-feedback:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.concept-row{position:relative;overflow:hidden;transition:background .15s ease-out,transform .15s ease-out,box-shadow .15s ease-out}.concept-row:before{content:"";position:absolute;left:0;top:0;bottom:0;width:2px;background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform 80ms ease-out}.concept-row:hover{background:var(--surface-raised);transform:translate(1px);box-shadow:var(--shadow-lift)}.concept-row:hover:before{transform:scaleX(1)}.concept-row:active{transform:translate(0);box-shadow:var(--shadow-soft)}.concept-row:focus-visible{outline:2px solid var(--accent);outline-offset:2px}@media (prefers-reduced-motion: reduce){.concept-row,.concept-row:before{transition:none}.concept-row:hover{transform:none}.concept-row:hover:before{transform:scaleX(0)}}.prog{max-width:640px;margin:0 auto;padding:16px 16px 24px;width:100%;box-sizing:border-box}@media (min-width: 880px){.prog{padding-top:32px}}.prog-top{margin:0 0 2px}.prog-home{margin-left:-8px}.prog-title{font-family:var(--font-display);font-weight:600;font-size:26px;line-height:1.15;letter-spacing:-.015em;color:var(--ink);margin:2px 0 0}@media (min-width: 880px){.prog-title{font-size:30px}}.prog-course{margin:14px 0 0}.resume{display:flex;flex-direction:column;align-items:stretch;gap:12px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);padding:14px 15px;box-shadow:var(--wash-shadow);margin:14px 0 0}.resume-l{min-width:0;flex:1}.resume-eyebrow{font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-faint)}.resume-topic{font-family:var(--font-display);font-weight:600;font-size:17px;letter-spacing:-.012em;margin:4px 0 3px;line-height:1.25;color:var(--ink)}.resume-cap{font-size:13px;color:var(--ink-dim)}.resume .btn{flex:none;width:100%;min-width:0}@media (min-width: 520px){.resume{flex-direction:row;align-items:center;gap:16px}.resume .btn{width:auto;min-width:140px}.resume-topic{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}}.reentry{position:relative;display:flex;flex-direction:column;gap:12px;background:var(--accent-soft);border:0;border-radius:var(--radius-card);padding:14px 15px;box-shadow:none;margin:4px 0 16px}.reentry-top{display:flex;align-items:center;justify-content:space-between}.reentry-body{display:flex;align-items:flex-start;gap:11px}.reentry-icon{flex:none;width:34px;height:34px;border-radius:var(--radius-ctl);background:var(--accent-warm-soft);color:var(--accent-warm);display:flex;align-items:center;justify-content:center}.reentry-l{min-width:0;flex:1}.reentry-eyebrow{font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-faint)}.reentry-headline{font-family:var(--font-display);font-weight:600;font-size:16px;letter-spacing:-.012em;margin:1px 0 0;line-height:1.3;color:var(--ink)}.reentry-detail{font-size:13px;color:var(--ink-dim);margin-top:2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.reentry .btn{flex:none;width:100%;min-width:0}.reentry-x{width:28px;height:28px;padding:0;margin:-4px -4px 0 0;display:flex;align-items:center;justify-content:center;border:0;border-radius:var(--radius-ctl);background:transparent;color:var(--ink-faint);font-size:20px;line-height:1;cursor:pointer;transition:background .15s ease,color .15s ease}.reentry-x:hover{background:color-mix(in srgb,var(--ink) 8%,transparent);color:var(--ink-dim)}.reentry-x:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.prog-summary{display:flex;align-items:center;gap:14px;margin:14px 0 0;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);padding:14px 15px;box-shadow:var(--wash-shadow)}.prog-sum-head{font-family:var(--font-display);font-weight:600;font-size:15px;letter-spacing:-.008em;color:var(--ink);text-transform:capitalize;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.topic-switch{display:flex;gap:8px;overflow-x:auto;margin:14px -16px 0;padding:2px 16px;scrollbar-width:none;-webkit-overflow-scrolling:touch;-webkit-mask-image:linear-gradient(90deg,#000 92%,transparent);mask-image:linear-gradient(90deg,#000 92%,transparent)}.topic-switch::-webkit-scrollbar{display:none}.topic-switch-btn{flex:none;min-height:36px;padding:0 14px;border-radius:var(--radius-pill);font-family:var(--font-sans);font-weight:500;font-size:13px;white-space:nowrap;cursor:pointer;text-transform:capitalize;background:var(--surface);color:var(--ink-dim);border:1px solid var(--line-strong);transition:background .15s ease,color .15s ease,border-color .15s ease}.topic-switch-btn:hover{border-color:var(--accent);color:var(--accent)}.topic-switch-btn.is-active{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}.topic-switch-btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.prog-body{margin-top:10px}.prog-concept{position:relative;overflow:hidden;box-sizing:border-box;display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%;text-align:left;min-height:56px;padding:0 4px;background:transparent;border:0;border-top:1px solid var(--line);color:var(--ink);font-family:inherit;cursor:pointer;transition:background .15s ease-out,transform .15s ease-out}.prog-concept:first-child{border-top:none}.prog-concept:before{content:"";position:absolute;left:0;top:0;bottom:0;width:2px;background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform .08s ease-out}.prog-concept.is-shaky:before{transform:scaleX(1)}.prog-concept:hover{background:var(--surface-raised);transform:translate(1px)}.prog-concept:hover:before{transform:scaleX(1)}.prog-concept:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}.pc-name{font-size:16px;font-weight:500}.pc-word{flex:none;font-size:13px;font-weight:600}.prog-empty{padding:28px 4px}.prog-empty p{color:var(--ink-dim);font-size:15px;line-height:1.5;margin:0 0 16px}@media (prefers-reduced-motion: reduce){.prog-concept,.prog-concept:before{transition:none}.prog-concept:hover{transform:none}.prog-concept:not(.is-shaky):hover:before{transform:scaleX(0)}}.paper{padding:0 18px 28px;max-width:720px;margin:0 auto}.paper-head{padding:18px 0 10px}.paper-title{font-family:var(--font-display);font-size:20px;font-weight:600;line-height:1.25;color:var(--ink);margin:4px 0 0}.paper-status{display:flex;flex-wrap:wrap;gap:6px 14px;align-items:baseline;margin-top:8px;font-size:14px;color:var(--ink-dim);line-height:1.5}.paper-status .is-strong{color:var(--ink);font-weight:500}.paper-clock{color:var(--ink-dim);font-variant-numeric:tabular-nums}.paper-clock.is-last{color:var(--ink);font-weight:500}.clock-choice{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 16px;margin:10px 2px 0;font-size:14px}.clock-choice-label{color:var(--ink-faint)}.clock-choice button{background:none;border:0;padding:2px 0;font:inherit;font-size:14px;color:var(--ink-dim);cursor:pointer;border-bottom:1.5px solid transparent;border-radius:0}.clock-choice button[aria-checked=true]{color:var(--ink);font-weight:500;border-bottom-color:var(--ink)}.clock-choice button:disabled{cursor:default;opacity:.6}.scheme{margin-top:12px}.scheme-heading{font-family:var(--font-display);font-size:15px;font-weight:600;color:var(--ink);margin:0}.scheme-lines{margin:8px 0 0;padding:0 0 0 18px;color:var(--ink);font-size:15px;line-height:1.55}.scheme-lines li+li{margin-top:6px}.scheme-says{margin-top:10px}.scheme-says-toggle{background:none;border:0;padding:0;font:inherit;font-size:14px;color:var(--ink-dim);cursor:pointer;border-bottom:1.5px solid var(--line);border-radius:0}.scheme-says-toggle[aria-expanded=true]{color:var(--ink);border-bottom-color:var(--ink)}.scheme-says-list{margin:8px 0 0;padding:0 0 0 18px;color:var(--ink-dim);font-size:14px;line-height:1.5}.scheme-rule{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 16px;margin:14px 2px 0;font-size:14px}.scheme-rule button{background:none;border:0;padding:2px 0;font:inherit;font-size:14px;color:var(--ink-dim);cursor:pointer;border-bottom:1.5px solid transparent;border-radius:0}.scheme-rule button[aria-checked=true]{color:var(--ink);font-weight:500;border-bottom-color:var(--ink)}.scheme-rule button:disabled{cursor:default;opacity:.6}.scheme-nums{display:flex;flex-wrap:wrap;gap:10px 18px;margin:10px 2px 0}.scheme-num{display:flex;flex-direction:column;gap:4px;font-size:13px;color:var(--ink-dim)}.scheme-num input{width:120px;padding:8px 10px;font:inherit;font-size:15px;color:var(--ink);background:var(--surface);border:1px solid var(--board-border);border-radius:8px}.scheme-num input:focus{outline:none;border-color:var(--accent);box-shadow:var(--field-focus-shadow)}.paper-score{font-variant-numeric:tabular-nums}.paper-item-mark{display:flex;align-items:baseline;gap:10px;white-space:nowrap}.paper-note{font-size:14px;color:var(--ink-faint);line-height:1.5;margin:6px 0 0}.paper-list{display:flex;flex-direction:column;gap:12px;margin-top:14px}.paper-item{background:var(--surface);border:1px solid var(--board-border);border-radius:var(--radius-card);box-shadow:var(--board-shadow);padding:14px 14px 12px}.paper-item-head{display:flex;align-items:baseline;justify-content:space-between;gap:10px}.paper-item-num{font-family:var(--font-display);font-weight:600;font-size:15px;color:var(--ink)}.paper-item-pts{font-size:12.5px;color:var(--ink-faint);white-space:nowrap}.paper-item-badge{font-size:11px;font-weight:600;letter-spacing:.3px;text-transform:uppercase;white-space:nowrap}.paper-item-badge.tone-ok{color:var(--ink-dim)}.paper-item-badge.tone-accent{color:var(--accent)}.paper-item-badge.tone-neutral{color:var(--ink-faint)}.paper-stmt{margin-top:8px;color:var(--ink);font-size:15px;line-height:1.55;overflow-x:auto}.paper-stmt .katex-display{margin:6px 0}.paper-options{display:flex;flex-direction:column;gap:8px;margin-top:12px}.paper-option{display:flex;align-items:flex-start;gap:10px;width:100%;text-align:left;padding:10px 12px;border-radius:10px;font-family:inherit;font-size:14.5px;line-height:1.45;color:var(--ink);cursor:pointer;background:var(--surface);border:1px solid var(--line-strong);box-shadow:var(--key-shadow);transition:border-color .15s ease-out,background .15s ease-out,transform .15s ease-out}.paper-option:hover:not(:disabled){border-color:var(--accent);background:var(--accent-soft);transform:translateY(-1px)}.paper-option:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.paper-option[aria-checked=true]{border-color:var(--accent);background:var(--accent-soft)}.paper-option:disabled{cursor:default}.paper-option-mark{flex-shrink:0;width:20px;height:20px;border-radius:6px;margin-top:1px;border:1.5px solid var(--marker-edge);display:inline-flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;color:var(--accent-ink);background:transparent}.paper-option[role=radio] .paper-option-mark{border-radius:50%}.paper-option[aria-checked=true] .paper-option-mark{background:var(--accent);border-color:var(--accent)}.paper-option-label{font-weight:600;color:var(--ink-dim);flex-shrink:0;min-width:16px}.paper-option-text{min-width:0;flex:1;overflow-x:auto}.paper-free{margin-top:12px}.paper-free textarea{width:100%;min-height:96px;resize:vertical;box-sizing:border-box;padding:10px 12px;border-radius:10px;font:inherit;font-size:15px;line-height:1.5;color:var(--ink);background:var(--surface-sunken);border:1px solid var(--line);outline:none;transition:border-color .15s ease,box-shadow .15s ease}.paper-free textarea:focus{border-color:var(--accent);box-shadow:var(--field-focus-shadow)}.paper-free textarea:disabled{color:var(--ink-dim)}.paper-symbols{display:flex;gap:6px;padding:8px 0 0;overflow-x:auto}.paper-saved{font-size:12px;color:var(--ink-faint);margin-top:6px;min-height:16px}.paper-foot{position:sticky;bottom:0;padding:12px 0 14px;margin-top:16px;background:linear-gradient(to bottom,transparent,var(--ground) 30%)}.paper-foot .btn-primary{width:100%}.paper-confirm{display:flex;flex-wrap:wrap;align-items:center;gap:10px 12px;padding:12px 14px;border:1px solid var(--line);border-radius:10px;background:var(--surface);color:var(--ink);font-size:14px;margin-bottom:10px}.paper-confirm .btn{min-width:0}.paper-review-open{margin-top:12px}.paper-error{margin:12px 0 0;padding:12px 14px;border:1px solid var(--line);border-radius:8px;background:var(--danger-soft);color:var(--ink);font-size:14px}.paper-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px}.home-secondary{margin-top:14px;width:100%}@media (min-width: 880px){.home-secondary{width:auto}.paper-foot .btn-primary{width:auto;min-width:220px}}.dest-shell{height:100dvh;position:relative;display:flex;flex-direction:column;background:var(--ground);color:var(--ink);font-family:var(--font-sans)}.dest-scroll{flex:1 1 auto;min-height:0;overflow-y:auto;overscroll-behavior:contain;display:flex;flex-direction:column;-webkit-overflow-scrolling:touch;padding-bottom:calc(84px + env(safe-area-inset-bottom,0px))}.home-dest,.practice,.exams{max-width:640px;margin:0 auto;width:100%;box-sizing:border-box;padding:16px 16px 24px}.practice{flex:1 1 auto;min-height:0;display:flex;flex-direction:column;padding-bottom:8px}.dest-scroll .prog{padding-bottom:24px}@media (min-width: 880px){.home-dest,.practice,.exams{max-width:660px;padding-top:40px}}.home-dest .home-primary{margin-top:20px}.upload-cta{display:inline-flex;align-items:center;justify-content:center;gap:10px}.upload-cta svg{flex:none}.exam-loading{color:var(--muted);font-size:14px;padding:8px 2px}.exam-list{display:flex;flex-direction:column;gap:10px}.exam-row{display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%;box-sizing:border-box;text-align:left;padding:14px 16px;border:1px solid var(--line);border-radius:var(--radius-card);background:var(--surface);cursor:pointer;transition:background .15s ease,border-color .15s ease,transform .15s ease}.exam-row:hover{background:var(--surface-raised);border-color:var(--accent);transform:translate(1px)}.exam-row:active{transform:translate(0)}.exam-row:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.exam-row-l{display:flex;flex-direction:column;gap:3px;min-width:0}.exam-title{font-family:var(--font-display);font-size:16px;font-weight:500;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.exam-sub{font-size:12.5px;color:var(--ink-dim)}.exam-state{flex:none;font-size:12px;font-weight:600;padding:4px 11px;border-radius:999px;background:var(--surface-sunken);color:var(--ink-dim);white-space:nowrap}.exam-state-submitted{background:var(--accent-soft);color:var(--accent)}.exam-state-in_progress{background:var(--accent-warm-soft);color:var(--accent-warm)}.dest-nav{position:absolute;left:50%;transform:translate(-50%);bottom:calc(14px + env(safe-area-inset-bottom,0px));z-index:20;display:flex;gap:2px;padding:6px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-pill);box-shadow:var(--shadow-soft);max-width:calc(100% - 32px)}.dest-nav-btn{flex:0 0 auto;display:flex;flex-direction:column;align-items:center;gap:2px;padding:7px 15px;border:none;background:none;cursor:pointer;color:var(--ink-faint);border-radius:var(--radius-pill);transition:color .15s ease,background .15s ease}.dest-nav-btn:hover{color:var(--ink)}.dest-nav-label{font-size:10.5px;font-weight:600;letter-spacing:.01em}@media (min-width: 880px){.dest-shell{flex-direction:row}.dest-nav{position:static;transform:none;order:-1;flex-direction:column;justify-content:flex-start;gap:4px;width:104px;max-width:none;border:none;border-right:1px solid var(--line);border-radius:0;box-shadow:none;background:var(--surface);padding:28px 12px}.dest-nav-btn{flex:none;padding:11px 6px;gap:5px;border-radius:var(--radius-ctl)}.dest-nav-label{font-size:12px}.dest-scroll{padding-bottom:0}}.dest-shell{font-family:var(--font-sans)}.dest-scroll{display:block}.appbar{display:flex;align-items:center;justify-content:space-between;padding:16px var(--gutter) 10px}.appbar-wm{font-family:var(--font-display);font-weight:700;letter-spacing:-.01em;color:var(--warm);font-size:15px}.pad,.home-hero{width:100%;box-sizing:border-box}.pad{padding:6px var(--gutter) 20px}.home-hero{padding:8px var(--gutter) 20px}@media (min-width: 880px){.pad,.home-hero{max-width:640px;margin:0 auto;padding-top:30px}}.page-title{margin:2px 0 14px;font-family:var(--font-display);font-size:var(--h1);font-weight:var(--wt-display);letter-spacing:var(--tr);line-height:var(--h1lh);color:var(--ink)}.home-greet{margin:0 0 6px;font-family:var(--font-display);font-size:var(--h1);font-weight:var(--wt-display);letter-spacing:var(--tr);line-height:var(--h1lh);color:var(--ink);text-wrap:balance}.home-sub{margin:0 0 16px;font-size:14px;color:var(--ink-dim);line-height:1.5}.home-entry{margin-top:4px}@media (min-width: 880px){.home-greet{font-size:calc(var(--h1) * 1.15)}}.composer{background:var(--surface);border:1px solid transparent;border-radius:var(--r-card);box-shadow:var(--e1);overflow:hidden;transition:border-color .15s ease,box-shadow .15s ease}.composer:focus-within{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent)}.composer.big .composer-field{min-height:64px}.composer-field{padding:15px 16px 6px}.composer-input{display:block;width:100%;box-sizing:border-box;border:0;background:transparent;resize:none;outline:none;color:var(--ink);font-family:var(--font-sans);font-size:15px;line-height:1.4;padding:0}.composer-input::placeholder{color:var(--ink-faint)}.composer-bar{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:8px 10px 10px 12px}.composer-cam{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:var(--r-ctl);background:var(--surface-sunken);border:1px solid var(--line);color:var(--ink-dim);cursor:pointer}.composer-cam:hover:not(:disabled){border-color:var(--accent);color:var(--accent)}.composer-cam:disabled{opacity:.5;cursor:default}.composer-hint{font-size:12px;color:var(--ink-faint);flex:1}.composer-spring{flex:1}.composer-send{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:999px;background:var(--accent);color:var(--accent-ink);border:0;cursor:pointer;flex:none}.composer-send:disabled{opacity:.4;cursor:default}.composer-cam:focus-visible,.composer-send:focus-visible,.chip:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.starters{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}.chip{font-family:var(--font-sans);font-size:13px;font-weight:500;color:var(--ink-dim);background:var(--surface);border:1px solid var(--line-strong);border-radius:var(--r-pill);padding:8px 13px;cursor:pointer;transition:border-color .15s ease,color .15s ease}.chip:hover:not(:disabled){border-color:var(--accent);color:var(--accent)}.chip:disabled{opacity:.5;cursor:default}.reentry{position:relative;background:var(--accent-soft);border:0;border-radius:var(--r-card);padding:14px 15px;box-shadow:var(--e1);margin:0 0 16px}.reentry-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}.eyebrow{font-size:11.5px;font-weight:600;letter-spacing:.01em;color:var(--ink-faint)}.reentry-body{display:flex;gap:11px;align-items:flex-start;margin-bottom:12px}.reentry-icon{width:34px;height:34px;border-radius:var(--r-ctl);background:var(--warm-soft);color:var(--warm);display:flex;align-items:center;justify-content:center;flex:none}.reentry-head{font-family:var(--font-display);font-size:15px;font-weight:600;letter-spacing:-.005em;color:var(--ink)}.reentry-sub{font-size:13px;color:var(--ink-dim);margin-top:2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.reentry-cta{width:100%}.ghosticon-sm{width:30px;height:30px;display:inline-flex;align-items:center;justify-content:center;border:none;background:transparent;color:var(--ink-faint);cursor:pointer;border-radius:var(--r-ctl);font-size:20px;line-height:1}.ghosticon-sm:hover{color:var(--ink-dim)}.section-label{font-size:var(--label);color:var(--ink-faint);font-weight:600;letter-spacing:.01em;margin:0 0 9px}.section-label.mt{margin-top:var(--gap-section)}.coursebar{display:flex;align-items:center;gap:10px;width:100%;box-sizing:border-box;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-ctl);padding:11px 13px;cursor:pointer;box-shadow:var(--e1);margin-bottom:14px;-webkit-appearance:none;-moz-appearance:none;appearance:none;text-align:left}.course-glyph{width:30px;height:30px;flex:none;border-radius:8px;background:var(--warm-soft);color:var(--warm);display:flex;align-items:center;justify-content:center;font-size:16px;font-weight:600}.coursebar .course-name{flex:1;text-align:left;font-family:var(--font-display);font-size:15px;font-weight:600;letter-spacing:-.005em;color:var(--ink);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.coursebar>svg{color:var(--ink-faint);flex:none}.chiprow{display:flex;gap:8px;overflow-x:auto;padding:0 var(--gutter);margin:0 calc(-1 * var(--gutter)) 4px;scrollbar-width:none;-webkit-mask-image:linear-gradient(90deg,#000 90%,transparent);mask-image:linear-gradient(90deg,#000 90%,transparent)}.chiprow::-webkit-scrollbar{display:none}.tchip{white-space:nowrap;font-family:var(--font-sans);font-size:13px;font-weight:500;color:var(--ink-dim);background:var(--surface);border:1px solid var(--line-strong);border-radius:var(--r-pill);padding:8px 13px;cursor:pointer;flex:none}.tchip.on{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}.tchip:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.rowlist{margin-top:8px}.rowlist.tight .listrow{padding:12px 2px}.listrow{display:flex;align-items:center;gap:12px;width:100%;box-sizing:border-box;text-align:left;background:none;border:0;border-bottom:1px solid var(--line);padding:14px 2px;cursor:pointer;color:var(--ink);-webkit-appearance:none;-moz-appearance:none;appearance:none}.listrow:last-child{border-bottom:0}.listrow:hover:not(:disabled) .row-t{color:var(--accent)}.listrow:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}.row-t{flex:1;min-width:0;font-family:var(--font-sans);font-size:15px;font-weight:500;letter-spacing:-.005em;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.status{flex:none;font-size:12.5px;font-weight:600}.status.solid{color:var(--accent-dark)}.status.learning{color:var(--building)}.status.notyet{color:var(--ink-faint)}.listrow>svg{color:var(--ink-dim);flex:none}.listrow:active:not(:disabled){background:var(--line)}.prog-summary{display:flex;align-items:center;gap:14px;background:var(--surface);border:0;border-radius:var(--r-card);padding:14px 15px;box-shadow:var(--e1);margin-bottom:14px}.prog-ring{flex:none;width:60px;height:60px;display:block}.prog-sum-txt{min-width:0}.prog-sum-head{font-family:var(--font-display);font-size:15px;font-weight:600;letter-spacing:-.005em;color:var(--ink);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.prog-sum-sub{font-size:13px;color:var(--ink-dim);margin-top:2px}.paperlist{display:flex;flex-direction:column;gap:10px}.paperrow{display:flex;align-items:center;gap:12px;width:100%;box-sizing:border-box;text-align:left;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);padding:14px 15px;cursor:pointer;box-shadow:var(--e1);-webkit-appearance:none;-moz-appearance:none;appearance:none}.paper-main{flex:1;min-width:0;display:flex;flex-direction:column;gap:3px}.paper-t{font-family:var(--font-display);font-size:15px;font-weight:600;letter-spacing:-.005em;color:var(--ink);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.paper-m{font-size:12.5px;color:var(--ink-dim)}.pstate{flex:none;font-size:12px;font-weight:600;padding:5px 10px;border-radius:var(--r-pill)}.pstate.submitted{background:var(--accent-soft);color:var(--accent)}.pstate.in_progress{background:var(--building-soft);color:var(--building)}.pstate.draft{background:var(--surface-sunken);color:var(--ink-faint);border:1px solid var(--line)}.paperrow:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.empty{text-align:center;padding:40px 20px}.empty-ic{width:56px;height:56px;margin:0 auto 14px;border-radius:16px;background:var(--surface-sunken);color:var(--ink-faint);display:flex;align-items:center;justify-content:center}.empty-copy{font-size:14px;color:var(--ink-dim);line-height:1.55;max-width:280px;margin:0 auto}.dest-nav{position:absolute;left:50%;transform:translate(-50%);bottom:calc(14px + env(safe-area-inset-bottom,0px));z-index:20;display:flex;gap:2px;padding:6px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-pill);box-shadow:var(--e2);max-width:calc(100% - 32px)}.dest-nav-wm,.dest-nav-theme{display:none}.dest-nav-btn{flex:0 0 auto;display:flex;flex-direction:column;align-items:center;gap:2px;padding:7px 14px;border:none;background:none;cursor:pointer;color:var(--ink-faint);border-radius:var(--r-pill);font-family:var(--font-sans);transition:color .15s ease,background .15s ease}.dest-nav-btn.is-active{color:var(--accent);background:var(--accent-soft)}.dest-nav-ico{display:inline-flex}.dest-nav-ico svg{width:20px;height:20px}.dest-nav-label{font-size:10.5px;font-weight:500;letter-spacing:.01em}.dest-nav-btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}@media (min-width: 880px){.dest-shell{flex-direction:row}.dest-nav{position:static;transform:none;order:-1;z-index:auto;flex-direction:column;align-items:stretch;justify-content:flex-start;width:212px;max-width:none;gap:2px;border:none;border-right:1px solid var(--line);border-radius:0;box-shadow:none;background:var(--surface);padding:20px 12px}.dest-nav-wm{display:block;font-family:var(--font-display);font-weight:700;letter-spacing:-.01em;color:var(--warm);font-size:15px;padding:4px 10px 18px}.dest-nav-btn{flex:none;flex-direction:row;justify-content:flex-start;gap:11px;padding:9px 11px;border-radius:var(--r-ctl);color:var(--ink-dim)}.dest-nav-btn.is-active{background:var(--accent-soft);color:var(--accent)}.dest-nav-label{font-size:14px;font-weight:500;letter-spacing:-.005em}.dest-nav-theme{display:inline-flex;align-items:center;justify-content:center;margin-top:auto;width:38px;height:38px;border-radius:var(--r-ctl);border:1px solid var(--line);background:transparent;color:var(--ink-dim);cursor:pointer}.dest-nav-theme:hover{color:var(--accent);border-color:var(--accent)}.dest-scroll{padding-bottom:0}.appbar{display:none}}.dest-shell .course-select{margin:0 0 14px}.dest-shell .course-tile{min-height:0;padding:11px 13px;box-shadow:var(--e1);margin:0;border-radius:var(--r-ctl)}.dest-shell .course-mark{width:30px;height:30px;font-size:16px;border-radius:8px}.dest-shell .course-tile .course-name{font-size:15px}.bubble{max-width:86%;box-sizing:border-box;font-family:var(--font-sans);font-size:15px;line-height:1.5;padding:11px 13px;border-radius:14px;box-shadow:none}.bubble.tutor{background:var(--tutor-bubble);color:var(--ink);border-top-left-radius:4px}.bubble.student{background:var(--accent-soft);color:var(--accent);border-top-right-radius:4px;font-weight:500}.think-bubble{background:var(--tutor-bubble);border-radius:4px 14px 14px;padding:13px 15px;display:inline-flex;gap:5px;align-items:center}.row-t,.tchip,.prog-sum-head,.paper-t{text-transform:none}@media (min-width: 1024px){:root{--h1: 36px;--body: 16.5px;--label: 13.5px;--gutter: 28px;--gap-section: 34px;--gap-group: 12px}.pad,.practice,.exams,.prog{max-width:820px;padding-top:48px}.home-hero{max-width:760px;padding-top:52px}.page-title{margin-bottom:22px}.home-sub{font-size:16.5px;margin-bottom:20px}.composer.big .composer-field{min-height:84px}.composer-field{padding:20px 22px 10px}.composer-input{font-size:17.5px;line-height:1.45}.composer-cam,.composer-send{width:42px;height:42px}.starters{gap:10px;margin-top:18px}.chip{font-size:15px;padding:10px 16px}.dest-shell .course-tile{padding:15px 18px}.dest-shell .course-tile .course-name{font-size:16.5px}.dest-shell .course-mark{width:34px;height:34px;font-size:18px}.chiprow{gap:10px}.tchip{font-size:15px;padding:10px 16px}.listrow{padding:18px 4px;gap:14px}.rowlist.tight .listrow{padding:15px 4px}.row-t{font-size:16.5px}.status{font-size:13.5px}.section-label{margin-bottom:11px}.reentry{padding:18px 20px}.btn{min-height:50px;padding:0 22px;font-size:16px}.bubble{font-size:16.5px;padding:13px 16px}.chip-answer,.chip-action{font-size:16px;padding:11px 17px}}.appbar-spacer{flex:1}.acct-icon-btn{position:relative;width:38px;height:38px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);background:var(--surface);color:var(--ink-dim);border-radius:var(--r-ctl);cursor:pointer;transition:color .15s ease,border-color .15s ease,background .15s ease}.acct-icon-btn:hover{color:var(--accent);border-color:var(--accent)}.acct-icon-btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.acct-icon-dot{position:absolute;top:3px;right:3px;width:8px;height:8px;border-radius:50%;background:var(--accent-warm);border:2px solid var(--surface)}.dest-nav-account{display:none}@media (min-width: 880px){.dest-nav-account{position:relative;display:inline-flex;align-items:center;justify-content:center;margin-top:auto;width:38px;height:38px;border-radius:var(--r-ctl);border:1px solid var(--line);background:transparent;color:var(--ink-dim);cursor:pointer;transition:color .15s ease,border-color .15s ease}.dest-nav-account:hover{color:var(--accent);border-color:var(--accent)}.dest-nav-account:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.dest-nav-account .acct-icon-dot{border-color:var(--ground)}}.acct-scrim{position:fixed;top:0;right:0;bottom:0;left:0;z-index:60;background:#0a101257;display:flex;align-items:flex-end;justify-content:center;animation:acct-scrim-in .18s ease}[data-theme=dark] .acct-scrim{background:#00000080}@keyframes acct-scrim-in{0%{opacity:0}to{opacity:1}}.acct-panel{position:relative;width:100%;background:var(--surface);color:var(--ink);border:1px solid var(--line);border-bottom:none;border-radius:22px 22px 0 0;padding:10px 20px calc(22px + env(safe-area-inset-bottom,0px));box-shadow:0 -10px 40px #1e282c24;animation:acct-sheet-in .26s cubic-bezier(.32,.72,0,1)}[data-theme=dark] .acct-panel{box-shadow:0 -10px 44px #00000080}@keyframes acct-sheet-in{0%{transform:translateY(102%)}to{transform:translateY(0)}}.acct-grab{width:36px;height:4px;border-radius:2px;background:var(--line-strong);opacity:.8;margin:2px auto 12px}.acct-head{display:flex;align-items:center;gap:12px;padding:2px 0 0}.acct-avatar{flex:none;width:44px;height:44px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;background:var(--accent-warm-soft);color:var(--accent-warm)}.acct-avatar.is-account{background:var(--accent-soft);color:var(--accent-dark)}.acct-id{min-width:0;flex:1}.acct-eyebrow{font-size:11.5px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-faint)}.acct-name{font-family:var(--font-display);font-weight:600;font-size:18px;letter-spacing:-.01em;margin-top:1px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.acct-x{flex:none;width:32px;height:32px;border:none;background:none;color:var(--ink-faint);font-size:22px;line-height:1;cursor:pointer;border-radius:var(--r-ctl)}.acct-x:hover{background:var(--surface-sunken);color:var(--ink)}.acct-block{width:100%;margin-top:14px}.acct-field{width:100%;box-sizing:border-box;font-size:15px;padding:11px 13px;border-radius:var(--r-ctl);border:1px solid var(--line-strong);background:var(--surface-sunken);color:inherit;margin-top:16px;font-family:var(--font-sans)}.acct-field::placeholder{color:var(--ink-faint)}.acct-field:focus{outline:none;border-color:var(--accent);box-shadow:var(--field-focus-shadow)}.acct-error{font-size:12.5px;color:var(--danger);margin-top:8px}.acct-note{font-size:12.5px;color:var(--ink-dim);line-height:1.5;margin:12px 0 0}.acct-note-center{text-align:center;color:var(--ink-faint)}.acct-sep-none{display:none}.acct-pref{display:flex;align-items:center;gap:12px;margin-top:18px;padding-top:18px;border-top:1px solid var(--line)}.acct-pref-label{flex:1;font-family:var(--font-display);font-weight:600;font-size:15px}.theme-seg{display:inline-flex;background:var(--surface-sunken);border:1px solid var(--line);border-radius:var(--r-pill);padding:3px}.theme-seg button{border:none;background:none;font-family:var(--font-sans);font-size:13px;font-weight:600;color:var(--ink-dim);padding:6px 13px;border-radius:var(--r-pill);cursor:pointer;display:inline-flex;align-items:center;gap:5px}.theme-seg button:hover{color:var(--ink)}.theme-seg button.is-on{background:var(--surface);color:var(--accent);box-shadow:0 1px 2px #0f1a1c1f}[data-theme=dark] .theme-seg button.is-on{box-shadow:none;border:1px solid var(--line-strong)}.theme-seg button:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.acct-danger{margin-top:18px}.acct-danger-link{background:none;border:none;font-family:var(--font-sans);font-size:13px;font-weight:500;color:var(--danger);cursor:pointer;padding:6px 0}.acct-danger-link:hover{text-decoration:underline}.acct-danger-title{display:block;font-family:var(--font-display);font-weight:600;font-size:15px}.acct-row2{display:flex;gap:8px;margin-top:12px}.acct-row2 .btn{flex:1;min-width:0}.btn-danger{background:var(--danger);color:#fff;border-color:transparent}.btn-danger:hover:not(:disabled){background:color-mix(in srgb,var(--danger) 88%,#000)}[data-theme=dark] .btn-danger{color:#1a1113}.acct-sent{padding-top:6px}.acct-sent-title{display:block;font-family:var(--font-display);font-weight:600;font-size:16px}@media (min-width: 880px){.acct-scrim{background:transparent;align-items:flex-end;justify-content:flex-start}[data-theme=dark] .acct-scrim{background:transparent}.acct-panel{width:340px;margin:0 0 16px 224px;border:1px solid var(--line);border-radius:var(--r-card);border-bottom:1px solid var(--line);padding:18px;box-shadow:var(--shadow-soft),0 12px 40px #1e282c29;animation:acct-pop-in .18s ease}[data-theme=dark] .acct-panel{box-shadow:0 14px 44px #00000080}@keyframes acct-pop-in{0%{opacity:0;transform:translateY(8px) scale(.98)}to{opacity:1;transform:none}}.acct-grab{display:none}}@media (prefers-reduced-motion: reduce){.acct-scrim,.acct-panel{animation:none}}:where(#root *){min-width:0}body{overflow-wrap:anywhere}.katex,.katex *,pre,code{overflow-wrap:normal}.dest-scroll,.tutor-chat,.tutor-workspace,.confirm-slot,.topic-list,.board-region{overflow-x:hidden}html,body,#root,.dest-shell,.tutor-root,.tutor-body,.home,.pad,.home-hero,.practice,.exams{overflow-x:clip}.reentry-head,.claim-card .reentry-sub{white-space:normal}.ws-cell{flex:1 1 auto;min-width:0;max-width:100%;overflow-x:auto;overflow-y:hidden;scrollbar-width:thin;-webkit-overflow-scrolling:touch}.ws-cell .katex-display{margin:0}@media (max-width: 879px){.dest-nav{position:static;transform:none;order:2;flex:none;align-self:center;margin:8px auto calc(12px + env(safe-area-inset-bottom,0px))}.dest-scroll{padding-bottom:12px;scroll-padding-bottom:12px}}@media (max-width: 879px){.dest-nav[inert]{visibility:hidden}}.acct-panel{max-height:100%;overflow-y:auto;box-sizing:border-box}.auth-banner{margin:8px 12px;padding:10px 12px;border-radius:var(--r-ctl);background:var(--accent-soft);border:1px solid var(--line);display:flex;align-items:center;gap:10px;font-size:14px;color:var(--ink)}.auth-banner .auth-banner-text{flex:1}.auth-banner .auth-banner-x{background:none;border:none;color:var(--ink-dim);cursor:pointer;font-size:18px;line-height:1}.name-prompt{margin:0 12px 8px;padding:12px;border-radius:var(--r-card);background:var(--surface);box-shadow:var(--e1)}.name-prompt-label{display:block;font-family:var(--font-display);font-weight:600;font-size:15px;margin-bottom:8px}.name-prompt-row{display:flex;gap:8px}.name-prompt-row .acct-field{flex:1}.name-prompt-row .btn{flex:none}.acct-email{font-size:12.5px;color:var(--ink-dim);margin-top:2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.acct-name-row{display:flex;gap:8px;margin-top:14px}.acct-name-row .acct-field{flex:1}.acct-name-row .btn{flex:none}.acct-name-label{display:block;font-family:var(--font-display);font-weight:600;font-size:15px;margin-top:18px}
