@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,math,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:"0.19.0"}.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>.katex-newline{display:block}.katex .katex-base{position:relative;white-space:nowrap;width:-webkit-min-content;width:-moz-min-content;width:min-content}.katex .katex-base,.katex .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 .katex-vbox{align-items:baseline;display:inline-flex;flex-direction:column}.katex .katex-thinbox{display:inline-flex;flex-direction:row;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 .katex-hdashline,.katex .katex-hline,.katex .katex-overline .overline-line,.katex .katex-rule,.katex .katex-underline .underline-line,.katex .mfrac .frac-line{min-height:1px}.katex .mspace{display:inline-block}.katex .katex-smash{display:inline;line-height:0}.katex .clap,.katex .llap,.katex .rlap{position:relative;width:0}.katex .clap>.katex-inner,.katex .llap>.katex-inner,.katex .rlap>.katex-inner{position:absolute}.katex .clap>.katex-fix,.katex .llap>.katex-fix,.katex .rlap>.katex-fix{display:inline-block}.katex .llap>.katex-inner{right:0}.katex .clap>.katex-inner,.katex .rlap>.katex-inner{left:0}.katex .clap>.katex-inner>span{margin-left:-50%;margin-right:50%}.katex .katex-rule{border:0 solid;display:inline-block;position:relative}.katex .katex-hline,.katex .katex-overline .overline-line,.katex .katex-underline .underline-line{border-bottom-style:solid;display:inline-block;width:100%}.katex .katex-hdashline{border-bottom-style:dashed;display:inline-block;width:100%}.katex .sqrt>.katex-root{margin-left:.2777777778em;margin-right:-.5555555556em}.katex .fontsize-ensurer.reset-size1.size1,.katex .katex-sizing.reset-size1.size1{font-size:1em}.katex .fontsize-ensurer.reset-size1.size2,.katex .katex-sizing.reset-size1.size2{font-size:1.2em}.katex .fontsize-ensurer.reset-size1.size3,.katex .katex-sizing.reset-size1.size3{font-size:1.4em}.katex .fontsize-ensurer.reset-size1.size4,.katex .katex-sizing.reset-size1.size4{font-size:1.6em}.katex .fontsize-ensurer.reset-size1.size5,.katex .katex-sizing.reset-size1.size5{font-size:1.8em}.katex .fontsize-ensurer.reset-size1.size6,.katex .katex-sizing.reset-size1.size6{font-size:2em}.katex .fontsize-ensurer.reset-size1.size7,.katex .katex-sizing.reset-size1.size7{font-size:2.4em}.katex .fontsize-ensurer.reset-size1.size8,.katex .katex-sizing.reset-size1.size8{font-size:2.88em}.katex .fontsize-ensurer.reset-size1.size9,.katex .katex-sizing.reset-size1.size9{font-size:3.456em}.katex .fontsize-ensurer.reset-size1.size10,.katex .katex-sizing.reset-size1.size10{font-size:4.148em}.katex .fontsize-ensurer.reset-size1.size11,.katex .katex-sizing.reset-size1.size11{font-size:4.976em}.katex .fontsize-ensurer.reset-size2.size1,.katex .katex-sizing.reset-size2.size1{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size2.size2,.katex .katex-sizing.reset-size2.size2{font-size:1em}.katex .fontsize-ensurer.reset-size2.size3,.katex .katex-sizing.reset-size2.size3{font-size:1.1666666667em}.katex .fontsize-ensurer.reset-size2.size4,.katex .katex-sizing.reset-size2.size4{font-size:1.3333333333em}.katex .fontsize-ensurer.reset-size2.size5,.katex .katex-sizing.reset-size2.size5{font-size:1.5em}.katex .fontsize-ensurer.reset-size2.size6,.katex .katex-sizing.reset-size2.size6{font-size:1.6666666667em}.katex .fontsize-ensurer.reset-size2.size7,.katex .katex-sizing.reset-size2.size7{font-size:2em}.katex .fontsize-ensurer.reset-size2.size8,.katex .katex-sizing.reset-size2.size8{font-size:2.4em}.katex .fontsize-ensurer.reset-size2.size9,.katex .katex-sizing.reset-size2.size9{font-size:2.88em}.katex .fontsize-ensurer.reset-size2.size10,.katex .katex-sizing.reset-size2.size10{font-size:3.4566666667em}.katex .fontsize-ensurer.reset-size2.size11,.katex .katex-sizing.reset-size2.size11{font-size:4.1466666667em}.katex .fontsize-ensurer.reset-size3.size1,.katex .katex-sizing.reset-size3.size1{font-size:.7142857143em}.katex .fontsize-ensurer.reset-size3.size2,.katex .katex-sizing.reset-size3.size2{font-size:.8571428571em}.katex .fontsize-ensurer.reset-size3.size3,.katex .katex-sizing.reset-size3.size3{font-size:1em}.katex .fontsize-ensurer.reset-size3.size4,.katex .katex-sizing.reset-size3.size4{font-size:1.1428571429em}.katex .fontsize-ensurer.reset-size3.size5,.katex .katex-sizing.reset-size3.size5{font-size:1.2857142857em}.katex .fontsize-ensurer.reset-size3.size6,.katex .katex-sizing.reset-size3.size6{font-size:1.4285714286em}.katex .fontsize-ensurer.reset-size3.size7,.katex .katex-sizing.reset-size3.size7{font-size:1.7142857143em}.katex .fontsize-ensurer.reset-size3.size8,.katex .katex-sizing.reset-size3.size8{font-size:2.0571428571em}.katex .fontsize-ensurer.reset-size3.size9,.katex .katex-sizing.reset-size3.size9{font-size:2.4685714286em}.katex .fontsize-ensurer.reset-size3.size10,.katex .katex-sizing.reset-size3.size10{font-size:2.9628571429em}.katex .fontsize-ensurer.reset-size3.size11,.katex .katex-sizing.reset-size3.size11{font-size:3.5542857143em}.katex .fontsize-ensurer.reset-size4.size1,.katex .katex-sizing.reset-size4.size1{font-size:.625em}.katex .fontsize-ensurer.reset-size4.size2,.katex .katex-sizing.reset-size4.size2{font-size:.75em}.katex .fontsize-ensurer.reset-size4.size3,.katex .katex-sizing.reset-size4.size3{font-size:.875em}.katex .fontsize-ensurer.reset-size4.size4,.katex .katex-sizing.reset-size4.size4{font-size:1em}.katex .fontsize-ensurer.reset-size4.size5,.katex .katex-sizing.reset-size4.size5{font-size:1.125em}.katex .fontsize-ensurer.reset-size4.size6,.katex .katex-sizing.reset-size4.size6{font-size:1.25em}.katex .fontsize-ensurer.reset-size4.size7,.katex .katex-sizing.reset-size4.size7{font-size:1.5em}.katex .fontsize-ensurer.reset-size4.size8,.katex .katex-sizing.reset-size4.size8{font-size:1.8em}.katex .fontsize-ensurer.reset-size4.size9,.katex .katex-sizing.reset-size4.size9{font-size:2.16em}.katex .fontsize-ensurer.reset-size4.size10,.katex .katex-sizing.reset-size4.size10{font-size:2.5925em}.katex .fontsize-ensurer.reset-size4.size11,.katex .katex-sizing.reset-size4.size11{font-size:3.11em}.katex .fontsize-ensurer.reset-size5.size1,.katex .katex-sizing.reset-size5.size1{font-size:.5555555556em}.katex .fontsize-ensurer.reset-size5.size2,.katex .katex-sizing.reset-size5.size2{font-size:.6666666667em}.katex .fontsize-ensurer.reset-size5.size3,.katex .katex-sizing.reset-size5.size3{font-size:.7777777778em}.katex .fontsize-ensurer.reset-size5.size4,.katex .katex-sizing.reset-size5.size4{font-size:.8888888889em}.katex .fontsize-ensurer.reset-size5.size5,.katex .katex-sizing.reset-size5.size5{font-size:1em}.katex .fontsize-ensurer.reset-size5.size6,.katex .katex-sizing.reset-size5.size6{font-size:1.1111111111em}.katex .fontsize-ensurer.reset-size5.size7,.katex .katex-sizing.reset-size5.size7{font-size:1.3333333333em}.katex .fontsize-ensurer.reset-size5.size8,.katex .katex-sizing.reset-size5.size8{font-size:1.6em}.katex .fontsize-ensurer.reset-size5.size9,.katex .katex-sizing.reset-size5.size9{font-size:1.92em}.katex .fontsize-ensurer.reset-size5.size10,.katex .katex-sizing.reset-size5.size10{font-size:2.3044444444em}.katex .fontsize-ensurer.reset-size5.size11,.katex .katex-sizing.reset-size5.size11{font-size:2.7644444444em}.katex .fontsize-ensurer.reset-size6.size1,.katex .katex-sizing.reset-size6.size1{font-size:.5em}.katex .fontsize-ensurer.reset-size6.size2,.katex .katex-sizing.reset-size6.size2{font-size:.6em}.katex .fontsize-ensurer.reset-size6.size3,.katex .katex-sizing.reset-size6.size3{font-size:.7em}.katex .fontsize-ensurer.reset-size6.size4,.katex .katex-sizing.reset-size6.size4{font-size:.8em}.katex .fontsize-ensurer.reset-size6.size5,.katex .katex-sizing.reset-size6.size5{font-size:.9em}.katex .fontsize-ensurer.reset-size6.size6,.katex .katex-sizing.reset-size6.size6{font-size:1em}.katex .fontsize-ensurer.reset-size6.size7,.katex .katex-sizing.reset-size6.size7{font-size:1.2em}.katex .fontsize-ensurer.reset-size6.size8,.katex .katex-sizing.reset-size6.size8{font-size:1.44em}.katex .fontsize-ensurer.reset-size6.size9,.katex .katex-sizing.reset-size6.size9{font-size:1.728em}.katex .fontsize-ensurer.reset-size6.size10,.katex .katex-sizing.reset-size6.size10{font-size:2.074em}.katex .fontsize-ensurer.reset-size6.size11,.katex .katex-sizing.reset-size6.size11{font-size:2.488em}.katex .fontsize-ensurer.reset-size7.size1,.katex .katex-sizing.reset-size7.size1{font-size:.4166666667em}.katex .fontsize-ensurer.reset-size7.size2,.katex .katex-sizing.reset-size7.size2{font-size:.5em}.katex .fontsize-ensurer.reset-size7.size3,.katex .katex-sizing.reset-size7.size3{font-size:.5833333333em}.katex .fontsize-ensurer.reset-size7.size4,.katex .katex-sizing.reset-size7.size4{font-size:.6666666667em}.katex .fontsize-ensurer.reset-size7.size5,.katex .katex-sizing.reset-size7.size5{font-size:.75em}.katex .fontsize-ensurer.reset-size7.size6,.katex .katex-sizing.reset-size7.size6{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size7.size7,.katex .katex-sizing.reset-size7.size7{font-size:1em}.katex .fontsize-ensurer.reset-size7.size8,.katex .katex-sizing.reset-size7.size8{font-size:1.2em}.katex .fontsize-ensurer.reset-size7.size9,.katex .katex-sizing.reset-size7.size9{font-size:1.44em}.katex .fontsize-ensurer.reset-size7.size10,.katex .katex-sizing.reset-size7.size10{font-size:1.7283333333em}.katex .fontsize-ensurer.reset-size7.size11,.katex .katex-sizing.reset-size7.size11{font-size:2.0733333333em}.katex .fontsize-ensurer.reset-size8.size1,.katex .katex-sizing.reset-size8.size1{font-size:.3472222222em}.katex .fontsize-ensurer.reset-size8.size2,.katex .katex-sizing.reset-size8.size2{font-size:.4166666667em}.katex .fontsize-ensurer.reset-size8.size3,.katex .katex-sizing.reset-size8.size3{font-size:.4861111111em}.katex .fontsize-ensurer.reset-size8.size4,.katex .katex-sizing.reset-size8.size4{font-size:.5555555556em}.katex .fontsize-ensurer.reset-size8.size5,.katex .katex-sizing.reset-size8.size5{font-size:.625em}.katex .fontsize-ensurer.reset-size8.size6,.katex .katex-sizing.reset-size8.size6{font-size:.6944444444em}.katex .fontsize-ensurer.reset-size8.size7,.katex .katex-sizing.reset-size8.size7{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size8.size8,.katex .katex-sizing.reset-size8.size8{font-size:1em}.katex .fontsize-ensurer.reset-size8.size9,.katex .katex-sizing.reset-size8.size9{font-size:1.2em}.katex .fontsize-ensurer.reset-size8.size10,.katex .katex-sizing.reset-size8.size10{font-size:1.4402777778em}.katex .fontsize-ensurer.reset-size8.size11,.katex .katex-sizing.reset-size8.size11{font-size:1.7277777778em}.katex .fontsize-ensurer.reset-size9.size1,.katex .katex-sizing.reset-size9.size1{font-size:.2893518519em}.katex .fontsize-ensurer.reset-size9.size2,.katex .katex-sizing.reset-size9.size2{font-size:.3472222222em}.katex .fontsize-ensurer.reset-size9.size3,.katex .katex-sizing.reset-size9.size3{font-size:.4050925926em}.katex .fontsize-ensurer.reset-size9.size4,.katex .katex-sizing.reset-size9.size4{font-size:.462962963em}.katex .fontsize-ensurer.reset-size9.size5,.katex .katex-sizing.reset-size9.size5{font-size:.5208333333em}.katex .fontsize-ensurer.reset-size9.size6,.katex .katex-sizing.reset-size9.size6{font-size:.5787037037em}.katex .fontsize-ensurer.reset-size9.size7,.katex .katex-sizing.reset-size9.size7{font-size:.6944444444em}.katex .fontsize-ensurer.reset-size9.size8,.katex .katex-sizing.reset-size9.size8{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size9.size9,.katex .katex-sizing.reset-size9.size9{font-size:1em}.katex .fontsize-ensurer.reset-size9.size10,.katex .katex-sizing.reset-size9.size10{font-size:1.2002314815em}.katex .fontsize-ensurer.reset-size9.size11,.katex .katex-sizing.reset-size9.size11{font-size:1.4398148148em}.katex .fontsize-ensurer.reset-size10.size1,.katex .katex-sizing.reset-size10.size1{font-size:.2410800386em}.katex .fontsize-ensurer.reset-size10.size2,.katex .katex-sizing.reset-size10.size2{font-size:.2892960463em}.katex .fontsize-ensurer.reset-size10.size3,.katex .katex-sizing.reset-size10.size3{font-size:.337512054em}.katex .fontsize-ensurer.reset-size10.size4,.katex .katex-sizing.reset-size10.size4{font-size:.3857280617em}.katex .fontsize-ensurer.reset-size10.size5,.katex .katex-sizing.reset-size10.size5{font-size:.4339440694em}.katex .fontsize-ensurer.reset-size10.size6,.katex .katex-sizing.reset-size10.size6{font-size:.4821600771em}.katex .fontsize-ensurer.reset-size10.size7,.katex .katex-sizing.reset-size10.size7{font-size:.5785920926em}.katex .fontsize-ensurer.reset-size10.size8,.katex .katex-sizing.reset-size10.size8{font-size:.6943105111em}.katex .fontsize-ensurer.reset-size10.size9,.katex .katex-sizing.reset-size10.size9{font-size:.8331726133em}.katex .fontsize-ensurer.reset-size10.size10,.katex .katex-sizing.reset-size10.size10{font-size:1em}.katex .fontsize-ensurer.reset-size10.size11,.katex .katex-sizing.reset-size10.size11{font-size:1.1996142719em}.katex .fontsize-ensurer.reset-size11.size1,.katex .katex-sizing.reset-size11.size1{font-size:.2009646302em}.katex .fontsize-ensurer.reset-size11.size2,.katex .katex-sizing.reset-size11.size2{font-size:.2411575563em}.katex .fontsize-ensurer.reset-size11.size3,.katex .katex-sizing.reset-size11.size3{font-size:.2813504823em}.katex .fontsize-ensurer.reset-size11.size4,.katex .katex-sizing.reset-size11.size4{font-size:.3215434084em}.katex .fontsize-ensurer.reset-size11.size5,.katex .katex-sizing.reset-size11.size5{font-size:.3617363344em}.katex .fontsize-ensurer.reset-size11.size6,.katex .katex-sizing.reset-size11.size6{font-size:.4019292605em}.katex .fontsize-ensurer.reset-size11.size7,.katex .katex-sizing.reset-size11.size7{font-size:.4823151125em}.katex .fontsize-ensurer.reset-size11.size8,.katex .katex-sizing.reset-size11.size8{font-size:.578778135em}.katex .fontsize-ensurer.reset-size11.size9,.katex .katex-sizing.reset-size11.size9{font-size:.6945337621em}.katex .fontsize-ensurer.reset-size11.size10,.katex .katex-sizing.reset-size11.size10{font-size:.8336012862em}.katex .fontsize-ensurer.reset-size11.size11,.katex .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 .katex-accent>.vlist-t,.katex .op-limits>.vlist-t{text-align:center}.katex .katex-accent .accent-body{position:relative}.katex .katex-accent .accent-body:not(.accent-full){width:0}.katex .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 .katex-stretchy{display:block;overflow:hidden;position:relative;width:100%}.katex .katex-stretchy:after,.katex .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 .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 .reflectbox{display:inline-block;transform:scaleX(-1)}.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>.katex-tag{position:absolute;right:0}.katex-display.leqno>.katex>.katex-html>.katex-tag{left:0;right:auto}.katex-display.fleqn>.katex{padding-left:2em;text-align:left}body{counter-reset:katexEqnNo mmlEqnNo}:root{--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;--bg: #faf9f6;--surface: #ffffff;--surface-soft: #f5f7fa;--text: #24364b;--text-strong: #182b43;--muted: #64748a;--border: #e3e8ee;--primary: #3979c5;--primary-hover: #2863a5;--primary-soft: #edf4fd;--focus: #276ab5;--green: #377d5c;--green-soft: #edf6ef;--orange: #a26020;--orange-soft: #fff3e5;--purple: #6d54ad;--purple-soft: #f1edfb;--danger: #e93325;--danger-soft: #fcf1ed;--score-danger: #e93325;--score-danger-soft: #fcf1ed;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-pill: 999px;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 20px;--space-6: 24px;--space-8: 32px;--space-10: 40px;--text-xs: 12px;--text-sm: 14px;--text-base: 16px;--text-lg: 18px;--text-xl: 22px;--text-title: 32px;--shadow: 0 3px 16px rgb(33 55 77 / 3%);--sidebar-width: 280px}.student-theme{--primary: #3979c5;--primary-hover: #2863a5;--primary-soft: #edf4fd;--focus: #276ab5;--bg: #faf9f6}.tone-blue{--tone: #3477be;--tone-soft: #edf5ff;--tone-mid: #d6e9fc}.tone-green{--tone: #438665;--tone-soft: #edf6ef;--tone-mid: #d6eadc}.tone-orange{--tone: #ad6926;--tone-soft: #fff4e7;--tone-mid: #fbe4c4}.tone-purple{--tone: #7354b8;--tone-soft: #f2eefb;--tone-mid: #e4dcf7}.student-account-label>span:last-child{display:flex;align-items:center;gap:var(--space-2)}.student-account-label small{color:var(--muted)}*{box-sizing:border-box}body{margin:0;font-family:var(--font-sans);font-size:var(--text-base);line-height:1.65;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}button,input,select,textarea{font:inherit}button,.button{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);min-height:44px;border:1px solid transparent;border-radius:var(--radius-sm);padding:10px 18px;background:var(--primary);color:var(--surface);font-size:var(--text-sm);font-weight:600;line-height:1.45;cursor:pointer;text-align:center;text-decoration:none}button:hover,.button:hover{background:var(--primary-hover);text-decoration:none}button:disabled{opacity:.5;cursor:default}.secondary{background:var(--surface);color:var(--primary);border-color:var(--border)}.secondary:hover{background:var(--primary-soft);border-color:var(--primary)}.small{padding:8px 14px;min-height:38px}svg{flex-shrink:0;vertical-align:middle}button:focus-visible,a:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--focus);outline-offset:3px}input,select,textarea{width:100%;border:1px solid #cdd7e1;border-radius:var(--radius-sm);background:var(--surface);padding:11px 13px;margin-top:var(--space-2);color:var(--text);min-height:44px}input::placeholder,textarea::placeholder{color:var(--muted)}textarea{min-height:120px;resize:vertical}label{display:block;font-size:var(--text-sm);font-weight:500}h1,h2,h3{color:var(--text-strong);line-height:1.4;overflow-wrap:anywhere}h1{font-size:var(--text-title);letter-spacing:-.6px;margin:6px 0 10px;font-weight:750}h2{font-size:var(--text-xl);margin:0 0 var(--space-3)}h3{font-size:var(--text-lg);margin:var(--space-3) 0;white-space:pre-wrap}p{white-space:pre-wrap;overflow-wrap:anywhere}small{font-size:var(--text-xs)}.muted{color:var(--muted);font-size:var(--text-sm)}.app{height:100vh;min-height:100vh;background:var(--bg);--app-topbar-height: 72px;display:grid;grid-template-rows:var(--app-topbar-height) minmax(0,1fr);overflow:hidden}.app-body{min-width:0;min-height:0;height:calc(100vh - var(--app-topbar-height));display:grid;grid-template-columns:var(--sidebar-width) minmax(0,1fr);align-items:start;overflow:hidden}.skip-link{position:fixed;top:-80px;left:16px;z-index:100;background:#fff;padding:12px}.skip-link:focus{top:12px}.sidebar{width:var(--sidebar-width);position:sticky;top:0;height:100%;background-color:var(--primary-soft);background-image:url(/images/sidebar-study-background-yukeyun-v2.png);background-repeat:no-repeat;background-position:center bottom;background-size:cover;border-right:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;padding:var(--space-8) var(--space-4);display:flex;flex-direction:column;z-index:20}.brand{display:flex;align-items:center;gap:var(--space-3);font-size:28px;color:var(--text-strong);font-weight:750;letter-spacing:1px;padding:0 var(--space-3)}.brand-logo{display:block;width:auto;height:auto;max-width:100%;object-fit:contain}.brand-logo-topbar{width:112px}.brand-logo-auth{width:min(260px,78%);margin:0 auto}.brand-logo-footer{width:82px}.brand:hover{text-decoration:none}.sidebar nav{display:grid;gap:var(--space-2)}.sidebar nav a{display:flex;align-items:center;gap:var(--space-3);padding:13px 16px;color:var(--text);border-radius:var(--radius-md);font-size:15px;font-weight:600;min-height:48px}.sidebar nav a:hover{background:var(--surface-soft);text-decoration:none}.sidebar nav a.active{color:var(--primary);background:#fff;font-weight:650;box-shadow:0 2px 8px #204c781a}.workspace{min-width:0;min-height:0;height:100%;margin-left:0;overflow-x:hidden;overflow-y:auto;background:radial-gradient(ellipse 220px 72px at 16% 3%,rgb(255 255 255 / 52%),transparent 72%),radial-gradient(ellipse 170px 56px at 32% 9%,rgb(255 255 255 / 46%),transparent 72%),radial-gradient(ellipse 260px 86px at 78% 4%,rgb(255 255 255 / 50%),transparent 74%),radial-gradient(ellipse 170px 54px at 91% 12%,rgb(255 255 255 / 45%),transparent 72%),linear-gradient(180deg,#f0f8ff,#f6faff 45%,#fff)}.topbar{width:100%;min-width:0;height:var(--app-topbar-height);position:sticky;top:0;z-index:30;display:flex;align-items:center;gap:var(--space-4);padding:0 var(--space-10);border-bottom:1px solid var(--border);font-size:var(--text-sm);background:var(--surface);color:var(--muted)}.topbar b{color:var(--text-strong)}.topbar-context{display:inline-flex;align-items:center;gap:var(--space-3)}.breadcrumb-divider{padding:0 var(--space-4);color:#96a1af}.workspace-identity{margin-left:auto;display:flex;align-items:center;gap:var(--space-2);color:var(--text)}.identity-icon{width:32px;height:32px;display:grid;place-items:center;border-radius:50%;background:var(--primary-soft);color:var(--primary)}main{max-width:1400px;padding:var(--space-8) var(--space-10) 56px;margin:0 auto;min-height:calc(100vh - 130px)}main:focus{outline:none}.page-heading{display:flex;align-items:center;justify-content:space-between;gap:var(--space-6);margin-bottom:var(--space-8)}.page-heading p{margin:0;color:var(--muted);font-size:var(--text-sm)}.page-heading>.button{flex-shrink:0}.student-home-heading-action{display:flex;align-items:center;gap:var(--space-4);flex-shrink:0}.student-home-heading-illustration{display:block;width:clamp(170px,18vw,260px);max-height:126px;height:auto;object-fit:contain;pointer-events:none}.eyebrow{font-size:10px;font-weight:650;letter-spacing:2px;color:var(--muted)}.card,.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow);padding:var(--space-6);margin-bottom:var(--space-5);min-width:0}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:var(--space-5)}.grid .card{margin:0}.row{display:flex;justify-content:space-between;align-items:center;gap:var(--space-5)}.form{display:grid;gap:var(--space-6);max-width:780px}.form button{justify-self:start}.inline-form{display:flex;align-items:flex-end;gap:var(--space-4);flex-wrap:wrap}.inline-form label{flex:1;min-width:130px}.badge{display:inline-flex;align-items:center;border-radius:var(--radius-pill);padding:5px 12px;font-size:var(--text-xs);font-weight:500;background:#f0f2f5;color:#536276;white-space:nowrap}.subject-badge{background:var(--primary-soft);color:var(--primary);margin-left:var(--space-2)}.subject-picker-actions{display:flex;flex-wrap:wrap;gap:var(--space-3)}.question-editor-page{display:grid;gap:var(--space-5)}.question-editor-toolbar{display:flex;align-items:end;gap:var(--space-5);flex-wrap:wrap;padding:var(--space-5);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg)}.question-editor-toolbar label{min-width:180px}.question-editor-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:var(--space-5);align-items:start}.question-preview-pane,.question-input-pane{min-height:640px;max-height:calc(100vh - 230px);overflow:auto}.question-input-pane{display:grid;gap:var(--space-5)}.rich-editor{display:grid;gap:var(--space-2)}.rich-toolbar{display:flex;align-items:center;flex-wrap:wrap;gap:4px;padding:5px;border:1px solid var(--border);border-bottom:0;border-radius:var(--radius-sm) var(--radius-sm) 0 0;background:var(--surface-soft)}.toolbar-button{min-width:34px;min-height:34px;padding:4px 8px;border:0;background:transparent;color:var(--text);font-weight:600}.toolbar-button:hover{background:var(--primary-soft);color:var(--primary)}.image-button{display:inline-flex;align-items:center;justify-content:center;cursor:pointer}.rich-editor textarea{margin-top:0;min-height:92px;border-radius:0}.rich-editor-preview{min-height:44px;padding:10px 12px;background:var(--surface-soft);border:1px solid var(--border);border-radius:var(--radius-sm);white-space:pre-wrap}.rich-editor-preview .muted{display:block;margin-bottom:4px}.rich-image,.question-images img{display:block;max-width:100%;height:auto;margin:10px 0;border-radius:var(--radius-sm)}.formula[role=button]{cursor:pointer}.blank-line{display:inline-block;width:6em;height:1.05em;border-bottom:2px solid currentColor;vertical-align:baseline;color:var(--text-strong)}.choice-editor{display:grid;gap:var(--space-4)}.choice-editor h3{margin:0}.choice-editor-row{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:var(--space-3);align-items:start;padding:var(--space-3);border:1px solid var(--border);border-radius:var(--radius-sm)}.choice-editor-row .rich-editor{min-width:0}.question-material{padding:var(--space-4);margin:var(--space-4) 0;border-left:3px solid var(--primary);background:var(--surface-soft);white-space:pre-wrap}.subquestion-row{display:grid;gap:var(--space-3);padding:var(--space-4);border:1px solid var(--border);border-radius:var(--radius-sm)}@media(max-width:900px){.question-editor-grid{grid-template-columns:1fr}.question-preview-pane,.question-input-pane{max-height:none}.question-preview-pane{order:2}.question-input-pane{order:1}}.badge.IN_PROGRESS{background:#eaf2fd;color:#2765ae}.badge.SUBMITTED{background:var(--orange-soft);color:var(--orange)}.badge.GRADED{background:var(--green-soft);color:var(--green)}.badge.EXPIRED{background:var(--danger-soft);color:var(--danger)}.avatar{width:42px;height:42px;display:inline-grid;place-items:center;border-radius:50%;background:var(--primary-soft);color:var(--primary);font-size:var(--text-lg);flex-shrink:0}.empty{text-align:center;color:var(--muted);font-size:var(--text-sm);padding:var(--space-10) var(--space-5);border:1px dashed var(--border);border-radius:var(--radius-md);margin:var(--space-4) 0}.error,.success{padding:var(--space-4) var(--space-5);border-radius:var(--radius-md);margin:var(--space-4) 0;font-size:var(--text-sm);overflow-wrap:anywhere}.error{color:var(--danger);background:var(--danger-soft)}.success{background:var(--green-soft);color:var(--green)}details{margin-top:var(--space-4);font-size:var(--text-sm)}summary{cursor:pointer;color:var(--primary);min-height:40px;padding:var(--space-2) 0}details .card{margin-top:var(--space-4);box-shadow:none}.check,.choice{display:flex;gap:var(--space-3);align-items:center}.check input,.choice input{width:18px;height:18px;min-height:0;margin:0;accent-color:var(--primary);flex-shrink:0}.check{font-size:var(--text-base)}.check+.inline-form{margin-top:var(--space-5)}.options{display:grid;gap:var(--space-2);font-size:var(--text-base);color:var(--text)}.options b{display:inline-block;width:28px;color:var(--primary)}.question h3{line-height:1.75}.answer-editor{display:grid;gap:var(--space-3);margin-top:var(--space-5)}.choice{padding:14px 18px;min-height:54px;border:1px solid transparent;background:#f0f5fa;border-radius:var(--radius-md);font-weight:400;cursor:pointer}.choice:hover{border-color:#bed4d0}.choice:has(input:checked){background:var(--primary-soft);border-color:var(--primary)}.answer-display,.feedback{border-top:1px solid var(--border);margin-top:var(--space-5);padding-top:var(--space-3);font-size:var(--text-sm)}.answer-image{display:block;max-width:100%;max-height:400px;border:1px solid var(--border);border-radius:var(--radius-sm);margin-top:var(--space-3)}.feedback .form{max-width:none}.feedback input[type=number]{max-width:180px}.summary-bar{display:flex;align-items:center;justify-content:space-between;gap:var(--space-4);border:1px solid var(--border);background:var(--surface);padding:var(--space-4) var(--space-5);border-radius:var(--radius-md);margin-bottom:var(--space-5);font-size:var(--text-sm)}.actions{display:flex;justify-content:flex-end;gap:var(--space-3)}.editor-fieldset{border:0;margin:0;padding:0;min-width:0}.student-link:hover{border-color:var(--primary);text-decoration:none}.student-link span{font-size:var(--text-sm)}footer{display:flex;align-items:center;justify-content:center;gap:var(--space-2);text-align:center;font-size:10px;letter-spacing:1.5px;color:var(--muted);padding:var(--space-4)}.dashboard-heading{position:relative}.dashboard-heading .page-heading{min-height:100px}.dashboard-heading .eyebrow{display:none}.dashboard-heading .page-heading>div{padding-bottom:20px}.learning-note{position:absolute;left:0;bottom:0;pointer-events:none;display:flex;align-items:center;gap:var(--space-5);color:#86694c;font-size:var(--text-sm)}.learning-note>span{border-bottom:2px solid #edc99c;padding-bottom:3px}.study-illustration{width:140px;height:90px;position:absolute;left:230px;bottom:0;opacity:.9}.metrics{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:var(--space-4);margin-bottom:var(--space-6)}.student-metrics{grid-template-columns:repeat(3,minmax(0,1fr))}.metric{display:flex;align-items:center;gap:var(--space-4);padding:var(--space-6) var(--space-5);border-radius:var(--radius-lg);background:var(--tone-soft)}.metric-icon{width:52px;height:52px;display:grid;place-items:center;background:var(--tone-mid);color:var(--tone);border-radius:50%;flex-shrink:0}.metric-label{font-size:var(--text-sm);color:var(--text)}.metric strong{display:block;font-size:30px;line-height:1.3;color:var(--text-strong);font-variant-numeric:tabular-nums}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:var(--space-4);margin-bottom:var(--space-5)}.section-heading h2{margin:0;font-size:20px}.section-heading a{font-size:var(--text-sm)}.assignment-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,270px),1fr));gap:var(--space-4);align-items:stretch}.assignment-card{border:1px solid var(--border);border-left:4px solid var(--tone-mid);border-radius:var(--radius-md);padding:var(--space-5);background:var(--surface);min-width:0;height:auto;min-height:0;display:flex;flex-direction:column}.student-assignment-section{margin-top:var(--space-8)}.student-assignment-summary{display:flex;gap:var(--space-3);margin:calc(var(--space-4) * -1) 0 var(--space-6);color:var(--muted);font-size:var(--text-sm)}.student-assignment-summary span{padding:var(--space-2) var(--space-3);background:var(--primary-soft);border-radius:var(--radius-pill)}.student-assignment-summary b{color:var(--primary);margin-left:var(--space-1)}.student-assignment-card{display:flex;flex-direction:column;gap:var(--space-3);height:auto;min-height:0;border-left-width:3px}.student-assignment-card.is-completed{border-left-color:var(--tone-mid)}.student-assignment-card.is-expired{opacity:.78}.assignment-card-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:var(--space-3)}.assignment-card-heading .badge{flex-shrink:0}.assignment-subject{color:var(--muted);font-size:var(--text-xs);margin:0}.assignment-meta{display:flex;flex-wrap:wrap;gap:var(--space-2) var(--space-4);color:var(--muted);font-size:var(--text-xs)}.assignment-meta span{display:inline-flex;align-items:center;gap:var(--space-1)}.student-countdown{display:flex;align-items:baseline;justify-content:space-between;padding:var(--space-4);color:var(--primary);background:var(--primary-soft);border-radius:var(--radius-sm)}.student-countdown span{font-size:var(--text-sm)}.student-countdown strong{font-size:28px;font-variant-numeric:tabular-nums}.student-countdown.urgent{color:var(--danger);background:var(--danger-soft)}.student-score-panel{padding:var(--space-4);color:var(--muted);background:var(--score-danger-soft);border-radius:var(--radius-sm);text-align:center}.student-score-panel strong{color:var(--score-danger);font-size:28px;margin:0 var(--space-1)}.student-assignment-card .student-score-panel.is-full-score{background:var(--green-soft)}.student-assignment-card .student-score-panel.is-full-score strong{color:var(--green)}.result-label{font-size:var(--text-base);font-weight:600}.result-label.correct{color:var(--green)}.result-label.partial,.result-label.incorrect{color:var(--score-danger)}.result-label.pending{color:var(--muted)}.mistake-summary-field{display:flex;align-items:flex-start;gap:var(--space-2);min-width:0}.mistake-summary-field svg{flex-shrink:0;margin-top:3px}.mistake-summary-field span{min-width:0;overflow-wrap:anywhere}.question-image-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,180px),1fr));gap:var(--space-3)}.question-image-grid img{max-width:100%;max-height:200px;object-fit:contain}.small-question-editor{min-width:0;margin-top:var(--space-4);padding:var(--space-3);border:1px solid var(--border);border-radius:var(--radius-sm)}.small-question-editor legend{font-weight:600}.question-input-pane>section{margin-top:var(--space-4)}.assignment-edit-question .section-heading,.assignment-edit-question .actions{flex-wrap:wrap}.confirmation-panel{max-width:480px}.assignment-deadline-note{min-height:24px;color:var(--muted);font-size:var(--text-sm);margin:0}.student-assignment-action{margin-top:auto}.student-assignment-action>*{width:100%}.student-assignment-action button.secondary:disabled{color:var(--muted);background:var(--surface-soft);border-color:var(--border)}.assignment-title{display:flex;gap:var(--space-3);align-items:center}.assignment-title h3{font-size:var(--text-base);margin:0 0 var(--space-1);display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;overflow:hidden}.assignment-icon{width:43px;height:48px;display:grid;place-items:center;background:var(--tone-soft);color:var(--tone);border-radius:var(--radius-sm);flex-shrink:0}.assignment-description{font-size:var(--text-sm);color:var(--muted);margin:var(--space-4) 0;line-height:1.8}.assignment-progress{display:flex;align-items:center;gap:var(--space-3);margin:var(--space-5) 0}.assignment-progress>div{flex-shrink:0}.assignment-progress strong{display:block;font-size:var(--text-lg)}.assignment-progress strong small{color:var(--muted);font-size:var(--text-sm);font-weight:400}.assignment-progress .muted{font-size:var(--text-xs)}progress{appearance:none;width:100%;height:9px;overflow:hidden;border:0;border-radius:var(--radius-pill);background:var(--surface-soft);color:var(--primary)}progress::-webkit-progress-bar{background:#e7edf3;border-radius:var(--radius-pill)}progress::-webkit-progress-value{background:var(--tone, var(--primary));border-radius:var(--radius-pill)}progress::-moz-progress-bar{background:var(--tone, var(--primary));border-radius:var(--radius-pill)}.assignment-progress progress{flex:1;min-width:30px}.pending-count{border-left:1px solid var(--border);padding-left:var(--space-3)}.pending-count strong{color:var(--orange)}.allocation-hint{font-size:var(--text-xs)}.assignment-actions>.button{width:100%}.assignment-actions details{margin-top:var(--space-2)}.assignment-actions summary{text-align:center}.snapshot-list .question{padding:var(--space-3)}.snapshot-list h3{font-size:var(--text-sm)}.table-scroll{overflow:auto}.submission-table{width:100%;border-collapse:collapse;text-align:left;font-size:var(--text-sm)}.pagination{display:flex;align-items:center;justify-content:center;gap:var(--space-3);margin-top:var(--space-5);color:var(--muted);font-size:var(--text-sm)}.pagination button{min-width:76px}.pagination-link{min-width:76px;text-align:center}.submission-table th{background:var(--surface-soft);color:var(--muted);font-size:var(--text-xs);font-weight:500;padding:var(--space-3) var(--space-4)}.submission-table th:first-child{border-radius:var(--radius-sm) 0 0 var(--radius-sm)}.submission-table th:last-child{border-radius:0 var(--radius-sm) var(--radius-sm) 0}.submission-table td{padding:var(--space-4);border-bottom:1px solid var(--border)}.submission-table tr:last-child td{border:0}.submission-table td:last-child,.submission-table th:last-child{text-align:right;white-space:nowrap}.student-cell{display:flex;align-items:center;gap:var(--space-3);white-space:nowrap}.avatar[class*=tone-]{background:var(--tone-soft);color:var(--tone)}.focus-mode .workspace{margin-left:0}.focus-mode .app-body{grid-template-columns:minmax(0,1fr);grid-template-rows:minmax(0,1fr)}.focus-mode .topbar{max-width:none;padding:0 max(var(--space-6),calc((100vw - 1280px)/2))}.focus-mode .brand{font-size:25px;color:var(--primary);padding:0}.focus-motto{font-size:var(--text-sm);color:var(--muted)}.focus-mode main{max-width:1320px;padding-top:var(--space-6)}.focus-mode .page-heading{margin-bottom:var(--space-5)}.focus-mode .page-heading h1{font-size:26px}.focus-mode .eyebrow{display:none}.work-heading-action{display:flex;align-items:center;gap:var(--space-3)}.time-note{color:var(--orange);background:var(--orange-soft);padding:7px 12px;border-radius:var(--radius-sm);font-size:var(--text-xs);display:flex;gap:var(--space-2);align-items:center}.countdown-banner{display:inline-flex;align-items:center;gap:var(--space-2);min-width:190px;justify-content:center;padding:12px 18px;color:var(--primary);background:var(--primary-soft);border-radius:var(--radius-md);white-space:nowrap}.countdown-banner strong{font-size:34px;line-height:1;font-variant-numeric:tabular-nums}.countdown-banner.urgent{color:var(--danger);background:var(--danger-soft)}.exam-header{display:grid;grid-template-columns:minmax(250px,1.35fr) minmax(170px,.85fr) minmax(210px,1fr) minmax(175px,.85fr) minmax(155px,.8fr);grid-template-areas:"title time progress deadline score";align-items:center;gap:var(--space-4);margin-bottom:var(--space-5);padding:var(--space-4) var(--space-5);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);box-shadow:var(--shadow)}.exam-title{grid-area:title;display:flex;flex-direction:column;align-items:flex-start;gap:var(--space-3);min-width:0;color:var(--primary)}.exam-title-heading{display:flex;align-items:center;gap:var(--space-3);min-width:0}.exam-title-meta{display:flex;align-items:center;flex-wrap:wrap;gap:var(--space-3);padding-left:42px}.exam-duration{color:var(--muted);font-size:var(--text-sm)}.exam-duration strong{color:var(--text);margin-left:4px;font-size:var(--text-base)}.exam-title h1{margin:0;font-size:22px;line-height:1.25;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.exam-title p{margin:3px 0 0;color:var(--muted);font-size:var(--text-xs)}.exam-time{grid-area:time;display:flex;flex-direction:column;align-items:center;gap:2px;padding:8px 14px;color:var(--primary);background:var(--primary-soft);border-radius:var(--radius-sm);white-space:nowrap}.exam-time span{display:inline-flex;align-items:center;gap:5px;font-size:var(--text-xs);font-weight:600}.exam-time strong{font-size:31px;line-height:1;font-variant-numeric:tabular-nums}.exam-time.urgent{color:var(--danger);background:var(--danger-soft)}.exam-progress{grid-area:progress;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:8px;min-width:0;color:var(--text);font-size:var(--text-xs)}.exam-progress strong{white-space:nowrap}.exam-progress progress{width:100%;min-width:70px;height:9px}.exam-progress span{color:var(--muted);white-space:nowrap}.exam-deadline{grid-area:deadline;display:flex;flex-direction:column;gap:2px;padding:8px 12px;color:var(--muted);background:var(--surface-soft);border-radius:var(--radius-sm);font-size:var(--text-xs)}.exam-deadline strong{color:var(--text);font-size:var(--text-sm)}.exam-deadline small{color:var(--danger)}.exam-score{grid-area:score;display:flex;flex-direction:column;gap:2px;padding:8px 12px;color:var(--muted);background:var(--surface-soft);border-radius:var(--radius-sm);font-size:var(--text-xs);white-space:nowrap}.exam-score strong{color:var(--text);font-size:var(--text-lg);font-variant-numeric:tabular-nums}.exam-score.graded strong{color:var(--score-danger);font-size:22px}.field-hint{display:block;color:var(--muted);font-size:var(--text-xs);font-weight:400;line-height:1.6}.choice-group{display:grid;gap:var(--space-2);border:1px solid var(--border);border-radius:var(--radius-md);padding:var(--space-4)}.choice-group legend{color:var(--text-strong);font-weight:600;padding:0 var(--space-1);display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:3;overflow:hidden;min-height:76px}.work-progress{display:flex;align-items:center;gap:var(--space-5);padding:var(--space-4) var(--space-5);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);margin-bottom:var(--space-5);font-size:var(--text-sm)}.work-progress strong,.work-progress>span{white-space:nowrap}.work-progress b{color:var(--primary);font-size:var(--text-lg);padding:0 var(--space-1)}.work-layout{display:grid;grid-template-columns:265px minmax(0,1fr);gap:var(--space-6);align-items:stretch}.question-sheet{grid-column:2;grid-row:1;min-width:0}.question-nav{grid-column:1;grid-row:1;position:sticky;top:var(--space-5);height:min(620px,calc(100vh - 330px));min-height:420px;box-sizing:border-box;padding:var(--space-5);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg)}.question-nav h2{font-size:var(--text-lg);margin-bottom:var(--space-5)}.question-numbers{display:flex;flex-wrap:wrap;gap:var(--space-2)}.question-numbers button{position:relative;border-radius:10px;width:44px;min-height:44px;aspect-ratio:1;padding:0;background:#eef3f8;color:var(--text);border:1px solid transparent;font-size:var(--text-sm);font-weight:700}.question-numbers button.answered{background:var(--primary);color:#fff}.question-numbers button.current{border:2px solid var(--primary);box-shadow:none}.question-numbers button.current:not(.correct):not(.incorrect){background:var(--primary-soft);color:var(--primary)}.question-number-label{position:relative;z-index:1}.question-check{position:absolute;right:1px;bottom:0;z-index:2;width:14px;height:14px;display:block;color:#fff;font-size:0}.question-check:not(.incorrect):before{content:"";position:absolute;left:4px;top:1px;width:5px;height:9px;border-right:2.1px solid currentColor;border-bottom:2.1px solid currentColor;border-radius:0 0 2px;transform:rotate(45deg)}.question-check.incorrect:before,.question-check.incorrect:after{content:"";position:absolute;left:1.5px;top:6px;width:11px;height:2.1px;border-radius:999px;background:currentColor}.question-check.incorrect:before{transform:rotate(45deg)}.question-check.incorrect:after{transform:rotate(-45deg)}.question-check.partial:after{content:"";position:absolute;left:7.5px;top:5.5px;width:6px;height:2.1px;border-radius:999px;background:currentColor;transform:rotate(45deg)}.question-legend{display:grid;gap:var(--space-2);font-size:var(--text-sm);color:var(--muted);margin:var(--space-4) 0}.question-legend span{font-size:var(--text-base);font-weight:600}.question-legend span{display:flex;align-items:center;gap:5px;min-height:25px}.legend-dot{width:11px;height:11px;border-radius:50%;background:#e6edf4}.legend-dot.done{background:var(--primary)}.legend-dot.current{background:#fff;border:1px solid var(--primary)}.work-layout .question{scroll-margin-top:var(--space-6)}.work-layout .question:focus{outline:2px solid var(--primary);outline-offset:3px}.focus-mode .question h3{font-size:var(--text-lg)}.catalog-filters{display:grid;grid-template-columns:repeat(2,minmax(150px,1fr));gap:var(--space-3);align-items:end;margin-top:var(--space-4)}.directory-form{align-items:end;grid-column:1 / -1}.directory-form label{flex:1}.assignment-bank-filters{grid-template-columns:repeat(2,minmax(160px,1fr))}.selected-question-list{display:grid;gap:var(--space-3);margin:var(--space-5) 0}.selected-question-row{display:flex;flex-wrap:wrap;gap:var(--space-3);align-items:center;padding:var(--space-3);border-bottom:1px solid var(--border)}.selected-question-row .selected-question-stem{flex:1 1 200px;min-width:0;overflow-wrap:anywhere}.selected-question-row label{width:120px}.selected-question-row .actions{margin:0}.selected-question-stem{min-width:0;overflow:hidden}.assignment-bank-panel{margin-top:var(--space-5)}.bank-question-row{justify-content:space-between;gap:var(--space-4)}.modal-backdrop{position:fixed;inset:0;z-index:1000;display:grid;place-items:center;padding:var(--space-6);background:#182b4359}.modal-panel{width:min(920px,100%);max-height:min(820px,calc(100vh - 48px));overflow-y:auto;padding:var(--space-6);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:0 20px 70px #182b4333}.modal-header{display:flex;align-items:flex-start;justify-content:space-between;gap:var(--space-5);margin-bottom:var(--space-5)}.modal-header h2{margin:4px 0}.modal-header p{margin:0}.modal-filters{margin:0 0 var(--space-5)}.question-bank-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--space-4)}.question-bank-card{display:flex;flex-direction:column;gap:var(--space-3);min-height:190px;padding:var(--space-4);background:var(--surface-soft);border:1px solid var(--border);border-radius:var(--radius-md)}.question-bank-card h3{flex:1;margin:0;font-size:var(--text-base)}.question-bank-card button{align-self:flex-start}.submission-toolbar label{min-width:160px}.mistake-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--space-5)}.mistake-card{display:flex;flex-direction:column;min-height:0;height:auto;overflow:visible}.mistake-card-top{flex-wrap:wrap;gap:var(--space-2)}.mistake-thumbnail{width:100%;height:74px;object-fit:contain;border-radius:var(--radius-sm);background:var(--surface-soft)}.mistake-stem{display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:4;overflow:hidden;margin:var(--space-2) 0}.mistake-score{margin-top:auto;color:var(--score-danger);font-size:28px;font-weight:800}.mistake-score-panel{margin-top:auto}.mistake-score span{color:var(--muted);font-size:var(--text-sm);font-weight:600}.mistake-card-actions{display:flex;gap:var(--space-2);margin-top:var(--space-3)}.mistake-detail-button{font-weight:700}.mistake-detail-answer,.mistake-detail-feedback,.mistake-detail-reference{margin-top:var(--space-6);padding-top:var(--space-4);border-top:1px solid var(--border)}.mistake-detail-answer h2,.mistake-detail-feedback h2,.mistake-detail-reference h2{font-size:var(--text-lg)}.mistake-detail-feedback .mistake-score{margin:0}.mistake-toolbar{display:flex;flex-wrap:wrap;align-items:end;gap:var(--space-4);margin-bottom:var(--space-5)}.mistake-toolbar label{flex:1;min-width:160px}.mistake-toolbar select,.mistake-history-selector select{width:100%}.mistake-source{overflow-wrap:anywhere;margin:0}.mistake-error-count{margin:0;color:var(--muted)}.mistake-error-count strong{color:var(--primary)}.mistake-history-selector{margin-bottom:var(--space-5)}.mistake-history-heading{justify-content:space-between;flex-wrap:wrap;gap:var(--space-3)}.mistake-history h2{font-size:var(--text-lg);margin:0 0 var(--space-2)}.mistake-history-heading p{margin:0}.mistake-history .mistake-detail-answer{margin-top:var(--space-4)}@media(max-width:600px){.mistake-toolbar label{min-width:100%}.mistake-card-actions .button{width:100%}}.subquestion-results{display:grid;gap:var(--space-2);margin:var(--space-4) 0}.subquestion-results .row{justify-content:space-between;padding:var(--space-2) var(--space-3);background:var(--surface-soft);border-radius:var(--radius-sm)}.upload-zone{display:flex;align-items:center;justify-content:center;gap:var(--space-4);position:relative;min-height:100px;padding:var(--space-5);border:1px dashed #79a699;background:#f5faf8;border-radius:var(--radius-md);color:var(--primary);cursor:pointer}.upload-zone strong{display:block;font-weight:600;color:var(--text)}.upload-zone small{display:block;font-weight:400;color:var(--muted);margin-top:3px}.upload-zone input{position:absolute;inset:0;width:100%;height:100%;margin:0;opacity:0;cursor:pointer}.upload-zone:focus-within{outline:3px solid var(--focus);outline-offset:3px}.upload-zone:hover{background:var(--primary-soft)}.work-actions{position:sticky;bottom:0;z-index:10;display:flex;gap:var(--space-3);justify-content:space-between;align-items:center;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);padding:var(--space-4);box-shadow:0 -3px 14px #21374d0a;margin-top:var(--space-5)}.work-actions .actions{flex-wrap:wrap}.work-navigation button,.work-back{font-size:var(--text-lg)}.work-navigation button{min-width:132px;min-height:50px}.work-back{margin-left:auto;color:var(--primary);font-weight:700;white-space:nowrap}.student-question-sheet .question{height:min(620px,calc(100vh - 330px));min-height:420px;overflow-y:auto}.teacher-question-sheet .question{min-height:260px}.assignment-edit-question{height:auto;min-height:0}.student-total-score,.student-result-score{color:var(--score-danger);font-size:var(--text-lg);font-weight:700}.student-result-score strong{font-size:28px}.question-numbers button.correct{background:var(--green-soft);color:var(--green);border-color:var(--green)}.question-numbers button.incorrect,.question-numbers button.partial{background:var(--score-danger-soft);color:var(--score-danger);border-color:var(--score-danger)}.question-numbers button.pending{background:#eef3f8;color:var(--text);border-color:transparent}.legend-dot.correct{background:var(--green)}.legend-dot.incorrect,.legend-dot.partial{background:var(--score-danger)}.legend-dot.pending{background:#e6edf4;border:1px solid var(--border)}.question-check.partial,.question-check.incorrect{color:var(--score-danger)}.question-numbers button.correct .question-check{color:var(--green)}.question-check.partial{border:0;background:none;transform:none;clip-path:none}.question-numbers button.incorrect .question-number-label,.question-numbers button.partial .question-number-label{color:var(--score-danger)}.question-numbers button.current{border:2px solid var(--primary)}@media(max-width:760px){.catalog-filters,.assignment-bank-filters{grid-template-columns:1fr}.modal-backdrop{padding:var(--space-3)}.modal-panel{max-height:calc(100vh - 24px);padding:var(--space-4)}.question-bank-grid{grid-template-columns:1fr}.selected-question-row{grid-template-columns:auto minmax(0,1fr)}.selected-question-row label,.selected-question-row button{grid-column:2}.mistake-grid{grid-template-columns:1fr}.mistake-card{height:auto;min-height:0;overflow:visible}.student-question-sheet .question{height:calc(100vh - 360px);min-height:360px}}.work-navigation{display:flex;gap:var(--space-2)}@media(min-width:1500px){.study-illustration{left:380px;width:160px}.dashboard-heading .page-heading{min-height:110px}}@media(max-width:1150px){main{padding:var(--space-6)}.exam-header{grid-template-columns:minmax(220px,1.25fr) minmax(145px,.8fr) minmax(180px,1fr);grid-template-areas:"title time deadline" "title progress score"}.metrics{grid-template-columns:repeat(2,minmax(0,1fr))}.work-layout{grid-template-columns:225px minmax(0,1fr);gap:var(--space-4)}.study-illustration{display:none}.metric{padding:var(--space-5)}}@media(max-width:760px){:root{--text-title: 27px}.sidebar{position:static;width:auto;height:auto;top:auto;padding:var(--space-4);border-right:0;border-bottom:1px solid var(--border)}.brand{padding:0;font-size:24px}.brand-logo-topbar{width:96px}.brand-logo-footer{width:72px}.sidebar nav{display:flex;flex-wrap:wrap;gap:var(--space-1);margin-top:var(--space-4)}.sidebar nav a{padding:9px 11px;font-size:15px;font-weight:600;min-height:42px;gap:var(--space-2)}.sidebar nav svg{width:17px;height:17px}.workspace{margin:0}.app{--app-topbar-height: 56px;grid-template-rows:var(--app-topbar-height) minmax(0,1fr)}.app-body{grid-template-columns:minmax(0,1fr);grid-template-rows:auto minmax(0,1fr)}.topbar{padding:0 var(--space-5);height:56px;font-size:var(--text-xs);gap:var(--space-2)}.topbar-context{flex-shrink:0;gap:0;font-size:0}.topbar-context .breadcrumb-divider{display:none}.topbar>a:not(.brand){min-width:0;flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.topbar>button,.topbar .workspace-identity{flex-shrink:0;white-space:nowrap}.topbar>button{padding:var(--space-2);font-size:var(--text-xs)}.topbar .workspace-identity{gap:var(--space-1);margin-left:0}main{padding:var(--space-6) var(--space-4) var(--space-8)}.page-heading{align-items:flex-start;flex-wrap:wrap;gap:var(--space-4);margin-bottom:var(--space-6)}.page-heading>.button{padding:10px 14px}.student-home-heading-action{width:100%;justify-content:flex-end}.student-home-heading-illustration{width:160px;max-height:78px}.card,.panel{padding:var(--space-5)}.row,.summary-bar{flex-wrap:wrap}.metrics{gap:var(--space-3)}.metric{gap:var(--space-3);padding:var(--space-4)}.metric-icon{width:38px;height:38px}.metric-icon svg{width:21px;height:21px}.metric strong{font-size:26px}.metric-label{font-size:var(--text-xs)}.dashboard-heading .page-heading{min-height:0;margin-bottom:var(--space-3)}.dashboard-heading .page-heading>div{padding-bottom:0}.learning-note{position:static;margin-bottom:var(--space-6)}.section-heading{flex-wrap:wrap}.section-heading h2{font-size:var(--text-lg)}.assignment-grid{grid-template-columns:1fr}.submission-table{min-width:520px}.focus-motto{display:none}.focus-mode .topbar{padding:0 var(--space-4)}.focus-mode main{padding:var(--space-5) var(--space-4) var(--space-8)}.focus-mode .page-heading h1{font-size:23px}.work-heading-action{flex-wrap:wrap}.work-progress{gap:var(--space-3);padding:var(--space-3);font-size:var(--text-xs)}.work-progress b{font-size:var(--text-base)}.work-layout{display:flex;flex-direction:column;gap:var(--space-4)}.question-nav{position:static;width:100%;height:auto;min-height:0;padding:var(--space-4)}.question-nav h2{font-size:var(--text-sm);margin-bottom:var(--space-3)}.question-numbers button{width:38px;min-height:38px}.question-legend{margin-bottom:0}.question-sheet{width:100%}.focus-mode .question{padding:var(--space-4)}.focus-mode .question h3{font-size:var(--text-base)}.choice{padding:var(--space-3);min-height:50px}.work-actions{flex-wrap:wrap;padding:var(--space-3);gap:var(--space-2);padding-bottom:max(var(--space-3),env(safe-area-inset-bottom))}.work-actions .actions{margin-left:auto;gap:var(--space-2)}.work-actions button{padding:10px 12px;font-size:13px}.upload-zone{padding:var(--space-4)}.focus-mode footer{padding-bottom:var(--space-8)}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}.dashboard-heading .page-heading{min-height:86px;margin-bottom:8px}.dashboard-heading .page-heading>div{padding-bottom:0}.learning-note{position:static;margin-bottom:var(--space-6)}.study-illustration{inset:0 170px auto auto}@media(max-width:760px){.exam-header{grid-template-columns:1fr auto;grid-template-areas:"title title" "time score" "progress progress" "deadline deadline";gap:var(--space-3);padding:var(--space-3)}.exam-title{grid-column:auto}.exam-title h1{font-size:19px}.exam-title-meta{padding-left:0}.exam-time{align-items:flex-start}.exam-time strong{font-size:26px}.exam-progress{grid-column:auto;grid-template-columns:auto 1fr auto}.exam-deadline,.exam-score{grid-column:auto}}@media(min-width:1500px){.study-illustration{left:auto;right:190px}}@media(min-width:761px){.assignment-grid{grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr))}}.rich-content{white-space:pre-wrap;overflow-wrap:anywhere}.formula{max-width:100%}.katex-display{overflow-x:auto;overflow-y:hidden;padding:.3rem}.answer-photos{display:grid;gap:1rem}.answer-photos img{max-width:100%;object-fit:contain}.subquestion-row,.subquestion-grading{display:grid;gap:.75rem}.subquestion-grading{margin:1rem 0;padding:1rem;background:var(--surface-muted, #f4f7f5);border-radius:12px}.question-images,.draft-images{display:grid;gap:.75rem;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));margin:1rem 0}.question-images img,.draft-images img{max-width:100%;max-height:420px;object-fit:contain;border-radius:12px}.auth-page{position:relative;min-height:100vh;display:grid;place-items:center;padding:clamp(20px,3vw,40px) 16px;overflow-x:hidden}.auth-background{position:fixed;inset:0;z-index:0;background-color:#9bd9f5;background-image:url(/images/auth-background-yukeyun-v1.png);background-position:center;background-size:cover;background-repeat:no-repeat;pointer-events:none}.auth-panel{position:relative;z-index:1;width:min(100%,460px);margin:0}.auth-form{display:grid;gap:14px;background:var(--surface);padding:28px;border-radius:20px;box-shadow:0 8px 40px #244b7010}.auth-form h1,.auth-form p{margin:0}.auth-form .brand-logo-auth{margin-bottom:2px}.auth-form label{display:grid;gap:6px}.auth-form-registration{gap:12px}.auth-overlay{position:fixed;inset:0;z-index:2000;background:#18304499;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:20px;gap:12px}.auth-overlay .auth-form{width:min(100%,440px)}@media(max-width:760px){.auth-form{padding:24px}}.student-management-card{height:auto;min-height:0;gap:var(--space-3)}.student-management-card .assignment-title{align-items:flex-start}.student-management-card .assignment-meta{min-height:24px}.student-management-card .auth-form{margin-top:var(--space-2);padding:var(--space-4);box-shadow:none;border:1px solid var(--border)}.student-management-actions{display:flex;flex-wrap:wrap;gap:var(--space-2);margin-top:auto}.student-management-actions button{flex:1 1 130px}.student-management-link{display:block;padding-top:var(--space-2);font-size:var(--text-sm)}.invite-panel{padding:var(--space-4);border-radius:var(--radius-sm);background:var(--primary-soft);overflow-wrap:anywhere}.invite-panel-heading{display:flex;justify-content:space-between;align-items:baseline;gap:var(--space-3);color:var(--text-strong);font-weight:650}.invite-panel-heading small{color:var(--muted);font-size:var(--text-xs);font-weight:400;text-align:right}.invite-code-row{display:flex;align-items:center;justify-content:space-between;gap:var(--space-3);margin-top:var(--space-3)}.invite-code-row strong{color:var(--primary);font-size:24px;letter-spacing:3px;font-variant-numeric:tabular-nums}.invite-code-row .button,.invite-code-row button{flex-shrink:0}.invite-empty{margin:var(--space-3) 0 0;color:var(--muted);font-size:var(--text-sm);line-height:1.6}.teacher-view-banner{padding:12px 18px;border-radius:12px;background:var(--primary-soft);color:var(--primary, #3e7bbc)}