@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:"0.19.1"}.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{color-scheme:light;--bg: #f3efe4;--bg-deep: #ece5d5;--surface: #fffdf7;--surface-soft: #f8f4e9;--surface-tint: #f1ebdc;--ink: #1d272b;--ink-soft: #344147;--muted: #6d746f;--muted-light: #8a8f88;--line: #d8d0bf;--line-strong: #bcb29d;--amber: #b45309;--amber-dark: #8a3f07;--amber-soft: #f4dfc3;--teal: #0f766e;--teal-soft: #d7ece7;--red: #b42318;--red-soft: #f7ded9;--violet: #6d28d9;--violet-soft: #eae2fb;--green: #3f6212;--shadow: 0 18px 50px rgba(52, 43, 25, .08);--shadow-soft: 0 8px 24px rgba(52, 43, 25, .06);--serif: "Iowan Old Style", "Palatino Linotype", "Songti SC", "STSong", "Noto Serif CJK SC", serif;--sans: "Avenir Next", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;--mono: "SFMono-Regular", "Cascadia Code", "Consolas", monospace;--radius: 18px;--radius-sm: 12px}*{box-sizing:border-box}html{min-width:320px;background:var(--bg);scroll-behavior:smooth}body{margin:0;min-height:100vh;color:var(--ink);font-family:var(--sans);font-size:15px;line-height:1.65;background-color:var(--bg);background-image:radial-gradient(circle at 14% -10%,rgba(180,83,9,.1),transparent 34rem),radial-gradient(circle at 88% 3%,rgba(15,118,110,.08),transparent 30rem),linear-gradient(rgba(70,62,45,.028) 1px,transparent 1px),linear-gradient(90deg,rgba(70,62,45,.028) 1px,transparent 1px);background-size:auto,auto,32px 32px,32px 32px;-webkit-font-smoothing:antialiased}button,input,textarea,select{font:inherit;color:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed}a{color:var(--amber-dark)}h1,h2,h3,h4,p{margin-top:0}h1,h2,h3{font-family:var(--serif);letter-spacing:-.02em;line-height:1.15}::selection{color:#fff;background:var(--amber)}:focus-visible{outline:2px solid var(--amber);outline-offset:3px}.app-shell{min-height:100vh}.app-main{padding:34px 22px 60px}.page{width:min(1160px,100%);margin:0 auto}.page-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:30px;margin-bottom:30px}.page-heading h1{margin:5px 0 8px;font-size:clamp(36px,5vw,58px)}.page-subtitle{max-width:620px;margin:0;color:var(--muted)}.eyebrow,.card-eyebrow{color:var(--amber-dark);font-size:11px;font-weight:700;letter-spacing:.14em;text-transform:uppercase}.section-heading-row,.section-title-row{display:flex;align-items:flex-end;justify-content:space-between;gap:24px}.section-heading-row h2,.section-title-row h2{margin:4px 0 0;font-size:clamp(24px,3vw,34px)}.page-footnote{margin-top:44px;padding-top:18px;border-top:1px solid var(--line);color:var(--muted);font-size:12px;text-align:center}.small-note{color:var(--muted);font-size:12px}.muted-text{color:var(--muted)}.teal-text{color:var(--teal)}.due-text{color:var(--red)!important}.app-header{position:sticky;top:0;z-index:40;border-bottom:1px solid rgba(188,178,157,.65);background:#f6f2e8e6;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px)}.header-inner{display:flex;align-items:center;justify-content:space-between;width:min(1220px,100%);height:68px;margin:0 auto;padding:0 24px;gap:26px}.brand{display:inline-flex;align-items:center;gap:11px;padding:0;border:0;background:transparent;text-align:left}.brand-mark{display:grid;place-items:center;width:38px;height:38px;border-radius:50%;color:#fff8e8;background:var(--ink);font-family:var(--serif);font-size:24px;font-style:italic;line-height:1}.brand-text{display:flex;flex-direction:column;line-height:1.15}.brand-text strong{font-family:var(--serif);font-size:17px;letter-spacing:.01em}.brand-text small{margin-top:2px;color:var(--muted);font-size:10px;letter-spacing:.08em}.main-nav{display:flex;align-items:center;gap:5px}.main-nav button{position:relative;padding:8px 14px;border:0;border-radius:999px;background:transparent;color:var(--muted);font-size:13px;font-weight:600;transition:color .15s ease,background .15s ease}.main-nav button:hover{color:var(--ink);background:#fffdf7cc}.main-nav button.active{color:var(--ink);background:var(--surface);box-shadow:inset 0 0 0 1px var(--line)}.nav-dot{position:absolute;top:5px;right:7px;width:6px;height:6px;border-radius:50%;background:var(--red);box-shadow:0 0 0 2px var(--bg)}.header-side{display:flex;align-items:center;gap:9px}.rank-chip{display:flex;align-items:center;gap:8px;padding:5px 10px;border:1px solid var(--line);border-radius:999px;background:#fffdf7a6;font-size:11px}.rank-chip span{color:var(--amber-dark);font-weight:700}.rank-chip strong{color:var(--muted);font-size:10px}.data-button{padding:7px 12px;border:1px solid var(--line-strong);border-radius:999px;background:transparent;color:var(--ink-soft);font-size:12px;font-weight:700}.data-button:hover{background:var(--surface)}.button{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:42px;padding:10px 18px;border:1px solid transparent;border-radius:999px;font-size:13px;font-weight:700;letter-spacing:.01em;transition:transform .12s ease,background .15s ease,color .15s ease,box-shadow .15s ease}.button:not(:disabled):hover{transform:translateY(-1px)}.button:disabled{opacity:.45}.button.primary{color:#fffaf0;background:var(--amber);box-shadow:0 8px 20px #b453092e}.button.primary:not(:disabled):hover{background:var(--amber-dark)}.button.ink{color:#fffaf0;background:var(--ink)}.button.ink:not(:disabled):hover{background:#10181b}.button.ghost{border-color:var(--line-strong);color:var(--ink);background:#fffdf78c}.button.ghost:not(:disabled):hover{background:var(--surface)}.button.danger{color:#fff;background:var(--red)}.button.large{min-height:50px;padding:13px 24px;font-size:14px}.button.small{min-height:34px;padding:7px 13px;font-size:12px}.button.full-width{width:100%}.button-arrow{font-family:var(--sans);font-size:16px;font-weight:400}.text-link,.text-button{padding:0;border:0;background:transparent;color:var(--amber-dark);font-size:13px;font-weight:700}.text-link:hover,.text-button:hover{text-decoration:underline;text-underline-offset:3px}.back-link{margin-bottom:18px;padding:0;border:0;background:transparent;color:var(--muted);font-size:12px;font-weight:700}.back-link:hover{color:var(--amber-dark)}.icon-button{display:grid;place-items:center;width:34px;height:34px;padding:0;border:1px solid var(--line);border-radius:50%;background:transparent;font-size:22px;line-height:1}.icon-button:hover{background:var(--surface-soft)}.inline-actions{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}.badge,.muted-chip,.tier-chip{display:inline-flex;align-items:center;min-height:24px;padding:3px 9px;border:1px solid var(--line);border-radius:999px;font-size:10px;font-weight:700;letter-spacing:.02em;white-space:nowrap}.badge.difficulty{border-color:transparent}.difficulty-基础{color:#475569;background:#eef2f4}.difficulty-进阶{color:#9a3412;background:#ffedd5}.difficulty-挑战{color:#6d28d9;background:var(--violet-soft)}.muted-chip{color:var(--muted);background:transparent}.source-tag{display:inline-flex;align-items:center;padding:1px 5px;border-radius:3px;color:var(--muted-light);background:#6d746f14;font-size:8px;font-weight:600;white-space:nowrap}.source-tag.adapted{color:#7c4a13;background:#f8ecd8}.tier-basic{color:var(--teal);border-color:#b9dcd4;background:var(--teal-soft)}.tier-advanced{color:var(--amber-dark);border-color:#edcfa4;background:var(--amber-soft)}.tier-boss{color:#fff;border-color:var(--ink);background:var(--ink)}.tier-trial{color:var(--violet);border-color:#d8c8f7;background:var(--violet-soft)}.status-pill{display:inline-flex;align-items:center;min-height:23px;padding:2px 8px;border-radius:999px;font-family:var(--sans);font-size:10px;font-weight:700;letter-spacing:.03em}.status-pill.cleared{color:var(--teal);background:var(--teal-soft)}.status-pill.pending{color:var(--amber-dark);background:var(--amber-soft)}.status-pill.locked{color:var(--muted);background:var(--surface-tint)}.stars{display:inline-flex;gap:1px;color:var(--line-strong);line-height:1;letter-spacing:0}.star{font-size:17px}.star.on{color:#c27803}.star.off{color:#d8d1c2}.stars-small .star{font-size:12px}.progress{width:100%;height:6px;overflow:hidden;border-radius:999px;background:#6b5f4621}.progress-fill{display:block;height:100%;border-radius:inherit;background:var(--amber);transition:width .4s ease}.progress-teal .progress-fill{background:var(--teal)}.progress-violet .progress-fill{background:var(--violet)}.home-hero{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(320px,.75fr);align-items:stretch;gap:36px;padding:34px 0 46px}.hero-copy{padding:26px 0 10px}.hero-copy h1{margin:14px 0 20px;font-size:clamp(48px,6.4vw,84px);font-weight:500;line-height:1.02}.hero-copy h1 span{color:var(--amber);font-style:italic}.lede{max-width:650px;margin-bottom:26px;color:var(--ink-soft);font-size:15px;line-height:1.9}.hero-actions{display:flex;flex-wrap:wrap;gap:10px}.rank-card{display:flex;flex-direction:column;justify-content:space-between;min-height:420px;padding:28px;border-radius:26px;color:#f8f2e4;background:radial-gradient(circle at 88% 6%,rgba(215,158,65,.2),transparent 14rem),linear-gradient(160deg,#202c30,#161f22 70%);box-shadow:var(--shadow)}.rank-card-top{display:flex;align-items:center;justify-content:space-between}.rank-kicker{color:#cec5b4;font-size:10px;letter-spacing:.16em}.rank-index{color:#9d9588;font-family:var(--mono);font-size:10px;letter-spacing:.08em}.rank-title{display:flex;flex-direction:column;margin:28px 0 10px}.rank-title strong{font-family:var(--serif);font-size:44px;font-weight:500;letter-spacing:.08em}.rank-title span{margin-top:3px;color:#d6c39e;font-family:var(--serif);font-size:17px;font-style:italic}.xp-number{margin:4px 0 22px;color:#bdb4a4;font-size:12px;letter-spacing:.1em}.xp-number span{color:#fff;font-family:var(--serif);font-size:32px;letter-spacing:0}.rank-card .progress{height:5px;background:#ffffff21}.rank-card .progress-fill{background:#d7a044}.rank-next{margin:12px 0 26px;color:#b8b0a2;font-size:11px}.rank-mini-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;padding-top:20px;border-top:1px solid rgba(255,255,255,.12)}.rank-mini-grid div{display:flex;flex-direction:column;gap:4px}.rank-mini-grid span{color:#9f978a;font-size:9px;letter-spacing:.08em}.rank-mini-grid strong{font-size:12px;font-weight:600}.rank-mini-grid .teal-text{color:#8fd8c7}.rank-mini-grid .muted-text{color:#a8a298}.dashboard-grid{display:grid;grid-template-columns:1.22fr 1fr 1fr;gap:16px;margin-bottom:52px}.continue-card,.review-card,.recent-card{display:flex;flex-direction:column;min-height:236px;padding:24px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow-soft)}.continue-card{color:#f7f1e5;border-color:#243136;background:radial-gradient(circle at 95% 0%,rgba(180,83,9,.26),transparent 15rem),#243136}.continue-card .card-eyebrow{color:#d7a044}.continue-card h2{margin:6px 0 10px;font-size:29px;font-weight:500}.continue-card p{color:#b9c0bd;font-size:13px}.continue-row{display:flex;align-items:center;flex-wrap:wrap;gap:12px;margin-top:auto}.continue-card .button.ink{color:var(--ink);background:#f5ecdb}.continue-card .small-note{color:#aeb6b3}.review-card h2,.recent-card h2{margin:4px 0 9px;font-size:25px;font-weight:500}.review-card p,.recent-card p{color:var(--muted);font-size:13px}.next-review-copy{margin:-5px 0 12px!important;color:var(--amber-dark)!important;font-size:10px!important}.review-card.has-due{border-color:#e5bfb7;background:linear-gradient(145deg,#fffaf2,#fdf1ed)}.review-card-head{display:flex;align-items:center;justify-content:space-between}.red-dot-label{display:inline-flex;align-items:center;gap:6px;color:var(--red);font-size:10px;font-weight:700}.red-dot-label:before{width:6px;height:6px;border-radius:50%;background:var(--red);content:""}.recent-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.recent-stats{display:flex;flex-wrap:wrap;gap:12px;margin:6px 0 14px;color:var(--muted);font-size:11px}.xp-chip{color:var(--amber-dark);font-weight:700}.recent-card .text-link{margin-top:auto;align-self:flex-start}.home-map-section{padding-top:4px}.chapter-mini-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:13px;margin-top:18px}.chapter-mini{position:relative;display:flex;flex-direction:column;align-items:stretch;min-height:208px;padding:19px;overflow:hidden;border:1px solid var(--line);border-radius:16px;background:var(--surface);text-align:left;transition:transform .16s ease,box-shadow .16s ease}.chapter-mini:before{position:absolute;top:0;left:0;width:100%;height:3px;background:var(--chapter-accent);content:""}.chapter-mini:hover{transform:translateY(-3px);box-shadow:var(--shadow-soft)}.chapter-mini.locked{background:#f8f4e9a8}.chapter-mini.locked:before{opacity:.35}.chapter-mini-head{display:flex;justify-content:space-between;align-items:center}.chapter-no{color:var(--chapter-accent);font-family:var(--mono);font-size:11px;font-weight:700}.chapter-state{color:var(--muted);font-size:10px;font-weight:700}.chapter-state.cleared{color:var(--teal)}.chapter-mini h3{margin:10px 0 4px;font-size:20px;font-weight:500}.chapter-mini p{min-height:36px;margin-bottom:16px;color:var(--muted);font-size:11px}.chapter-mini .progress{height:4px;margin-bottom:13px}.mini-levels{display:flex;flex-direction:column;gap:5px;margin-top:auto}.mini-level{display:flex;align-items:center;justify-content:space-between}.mini-level em{color:var(--muted);font-size:9px;font-style:normal;letter-spacing:.04em}.map-summary{min-width:230px;padding:16px 20px;border:1px solid var(--line);border-radius:16px;background:#fffdf7a6}.summary-number{display:flex;align-items:baseline;gap:6px}.summary-number strong{font-family:var(--serif);font-size:34px;font-weight:500}.summary-number span{color:var(--muted);font-size:11px}.summary-meta{display:flex;flex-direction:column;gap:2px;margin-top:4px;color:var(--muted);font-size:10px}.unlock-banner{display:flex;align-items:center;justify-content:space-between;gap:30px;margin-bottom:22px;padding:22px 26px;border:1px solid #e1c596;border-radius:var(--radius);background:linear-gradient(135deg,#fff9eb,#f6e7c9)}.unlock-banner h2{margin:4px 0 3px;font-size:26px;font-weight:500}.unlock-banner p{margin:0;color:#735b34;font-size:12px}.unlock-actions{display:flex;flex-wrap:wrap;gap:9px}.chapter-stack{display:flex;flex-direction:column;gap:18px}.chapter-panel{position:relative;padding:24px;overflow:hidden;border:1px solid var(--line);border-radius:22px;background:var(--surface);box-shadow:var(--shadow-soft)}.chapter-panel:before{position:absolute;top:0;left:0;width:4px;height:100%;background:var(--chapter-accent);content:""}.chapter-panel.chapter-locked{background:#f9f5ecb8}.chapter-panel.chapter-locked:before{opacity:.4}.chapter-panel-head{display:flex;align-items:center;justify-content:space-between;gap:30px;margin-bottom:22px}.chapter-title-block{display:flex;align-items:center;gap:16px;min-width:0}.chapter-index{display:flex;flex-direction:column;align-items:center;justify-content:center;width:54px;height:62px;flex:0 0 auto;border-right:1px solid var(--line);color:var(--chapter-accent)}.chapter-index span{font-family:var(--mono);font-size:8px;letter-spacing:.12em}.chapter-index strong{font-family:var(--serif);font-size:28px;font-weight:500;line-height:1}.chapter-title-line{display:flex;align-items:center;flex-wrap:wrap;gap:8px}.chapter-title-line h2{margin:0;font-size:clamp(22px,2.7vw,31px);font-weight:500}.chapter-title-block p{margin:3px 0 0;color:var(--muted);font-size:11px}.chapter-score{width:190px;flex:0 0 auto}.chapter-score>span{display:block;margin-bottom:6px;color:var(--muted);font-size:10px;text-align:right}.level-track{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.level-track-item{position:relative;min-width:0}.track-connector{position:absolute;top:36px;left:-14px;width:14px;height:1px;background:var(--line-strong)}.level-node{position:relative;display:flex;flex-direction:column;width:100%;min-height:212px;padding:16px;border:1px solid var(--line);border-radius:15px;background:var(--surface-soft);text-align:left;transition:transform .16s ease,border-color .16s ease,box-shadow .16s ease}.level-node:not(.locked):hover{transform:translateY(-2px);border-color:var(--line-strong);box-shadow:0 10px 24px #342b1912}.level-node.locked{color:#7d7b73;border-style:dashed;background:#f5f1e8;opacity:.82}.level-node.has-stars{border-color:#d9bf91}.level-node.boss{color:#f5eee1;border-color:#2e3b3f;background:radial-gradient(circle at 100% 0%,rgba(180,83,9,.25),transparent 10rem),#29363a}.level-node.boss.locked{color:#9aa19e;border-color:#4d585b;background:#303a3d}.node-topline{display:flex;align-items:center;justify-content:space-between;gap:8px}.node-code{color:var(--muted);font-family:var(--mono);font-size:8px;letter-spacing:.05em}.level-node.boss .node-code{color:#aab1ad}.lock-mark{color:var(--muted);font-size:9px;font-weight:700}.level-node.boss .lock-mark{color:#c7a879}.node-title{display:flex;align-items:center;gap:7px;margin:12px 0 6px}.node-title h3{margin:0;font-size:19px;font-weight:500}.boss-mark{padding:1px 5px;border:1px solid rgba(215,160,68,.5);border-radius:3px;color:#e2b66d;font-family:var(--mono);font-size:7px;letter-spacing:.08em}.level-node>p{min-height:36px;margin-bottom:10px;color:var(--muted);font-size:10px;line-height:1.55}.level-node.boss>p{color:#aeb6b3}.node-meta{display:flex;align-items:center;flex-wrap:wrap;gap:7px;margin-top:auto}.level-node.boss .badge.difficulty{color:#f1d8a9;background:#d7a04426}.node-count{color:var(--muted);font-size:9px}.level-node.boss .node-count{color:#9fa8a5}.node-enter,.node-lock-copy{display:block;margin-top:12px;padding-top:10px;border-top:1px solid var(--line);font-size:9px;line-height:1.5}.node-enter{color:var(--amber-dark);font-weight:700}.level-node.boss .node-enter{color:#e2b66d;border-top-color:#ffffff1f}.node-lock-copy{color:var(--muted)}.level-node.boss .node-lock-copy{border-top-color:#ffffff1a;color:#aab1ad}.chapter-unlock-inline{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-top:16px;padding:12px 15px;border:1px solid #e3cba3;border-radius:11px;color:#725a33;background:#fdf5e5;font-size:11px}.map-legend{display:flex;flex-wrap:wrap;gap:24px;margin-top:26px;padding:16px 0;border-top:1px solid var(--line);color:var(--muted);font-size:10px}.map-legend>div{display:flex;align-items:center;gap:7px}.legend-dot{width:7px;height:7px;border-radius:50%;background:var(--line-strong)}.legend-dot.cleared{background:var(--teal)}.legend-dot.pending{background:var(--amber)}.legend-dot.locked{background:var(--muted-light)}.lock-detail{display:flex;flex-direction:column;align-items:center;text-align:center}.lock-icon,.lock-emblem{display:grid;place-items:center;width:58px;height:58px;margin-bottom:16px;border:1px solid var(--line-strong);border-radius:50%;color:var(--muted);font-family:var(--serif);font-size:18px}.lock-detail>p{margin-bottom:16px;color:var(--ink-soft)}.lock-rules,.lock-rule-list{display:flex;flex-direction:column;gap:6px;width:100%;margin-bottom:20px;padding:14px;border-radius:10px;background:var(--surface-soft);color:var(--muted);font-size:11px;text-align:left}.lock-rule-list{max-width:520px;margin:14px 0 0}.level-page{max-width:1080px}.level-hero{display:flex;align-items:flex-end;justify-content:space-between;gap:26px;margin-bottom:22px;padding:28px 30px;border:1px solid var(--line);border-radius:22px;background:radial-gradient(circle at 97% 5%,rgba(180,83,9,.12),transparent 20rem),var(--surface);box-shadow:var(--shadow-soft)}.level-hero h1{margin:6px 0 7px;font-size:clamp(38px,5vw,60px);font-weight:500}.level-hero-main>p{margin-bottom:15px;color:var(--muted)}.level-tag-row{display:flex;align-items:center;flex-wrap:wrap;gap:8px}.level-hero-side{display:flex;flex-direction:column;align-items:flex-end;flex:0 0 auto;padding-left:24px;border-left:1px solid var(--line)}.level-hero-side span{color:var(--muted);font-size:10px}.level-hero-side strong{margin:2px 0 8px;font-family:var(--serif);font-size:30px;font-weight:500}.locked-panel{display:flex;align-items:center;gap:20px;margin-bottom:20px;padding:22px 24px;border:1px dashed var(--line-strong);border-radius:var(--radius);background:#f8f4e9cc}.locked-panel>div:nth-child(2){flex:1}.locked-panel h2{margin:0 0 4px;font-size:26px;font-weight:500}.locked-panel p{margin:0;color:var(--muted)}.session-banner{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:18px;padding:16px 20px;border:1px solid #c9d9d4;border-radius:13px;background:#f2f9f6}.session-banner strong{font-family:var(--serif);font-size:19px;font-weight:500}.session-banner p{margin:2px 0 0;color:var(--muted);font-size:11px}.level-detail-grid{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(280px,.72fr);gap:18px;align-items:start}.goal-card,.level-question-preview{padding:26px;border:1px solid var(--line);border-radius:20px;background:var(--surface);box-shadow:var(--shadow-soft)}.goal-count{color:var(--muted);font-family:var(--mono);font-size:10px}.goal-block{margin-top:24px;padding-top:20px;border-top:1px solid var(--line)}.goal-block h3{margin-bottom:11px;color:var(--muted);font-family:var(--sans);font-size:10px;font-weight:700;letter-spacing:.12em;text-transform:uppercase}.distribution-row{display:flex;flex-wrap:wrap;gap:8px}.distribution-chip{display:flex;align-items:baseline;gap:7px;min-width:102px;padding:9px 12px;border:1px solid var(--line);border-radius:10px;background:var(--surface-soft)}.distribution-chip strong{font-family:var(--serif);font-size:24px;font-weight:500}.distribution-chip span{color:var(--muted);font-size:10px}.distribution-chip.type-choice{border-left:3px solid var(--teal)}.distribution-chip.type-judge{border-left:3px solid #64748b}.distribution-chip.type-solution{border-left:3px solid var(--amber)}.rule-list{display:flex;flex-direction:column;gap:10px;margin:0;padding:0;list-style:none}.rule-list li{display:flex;align-items:flex-start;gap:10px;color:var(--ink-soft);font-size:12px}.star-rule{flex:0 0 38px;padding-top:2px;color:var(--amber-dark);font-family:var(--mono);font-size:9px;font-weight:700}.goal-metrics{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:22px 0}.goal-metrics>div{display:flex;flex-direction:column;padding:14px;border-radius:11px;background:var(--surface-soft)}.goal-metrics span{color:var(--muted);font-size:9px;letter-spacing:.08em}.goal-metrics strong{margin:3px 0;font-family:var(--serif);font-size:21px;font-weight:500}.goal-metrics small{color:var(--muted-light);font-size:9px}.start-note{margin:10px 0 0;color:var(--muted);font-size:10px;text-align:center}.level-question-preview{position:sticky;top:90px}.question-preview-list{display:flex;flex-direction:column;gap:0;margin:18px 0;padding:0;list-style:none}.question-preview-list li{display:flex;gap:12px;padding:13px 0;border-bottom:1px solid var(--line)}.question-preview-list li:last-child{border-bottom:0}.preview-index{color:var(--muted-light);font-family:var(--mono);font-size:9px}.question-preview-list strong{display:block;font-size:12px;font-weight:600}.preview-meta{display:flex;align-items:center;gap:6px;margin-top:4px;color:var(--muted);font-size:9px}.goal-progress-note{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:9px;margin-top:12px;padding-top:16px;border-top:1px solid var(--line);color:var(--muted);font-size:10px}.focus-shell{min-height:100vh;background:radial-gradient(circle at 12% 0%,rgba(180,83,9,.08),transparent 26rem),var(--bg)}.play-header{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:16px;width:min(980px,100%);margin:0 auto;padding:19px 22px 15px}.play-exit{justify-self:start;padding:6px 0;border:0;background:transparent;color:var(--muted);font-size:11px;font-weight:700}.play-exit:hover{color:var(--red)}.play-title{display:flex;flex-direction:column;align-items:center;line-height:1.2}.play-title span{color:var(--amber-dark);font-size:9px;font-weight:700;letter-spacing:.12em}.play-title strong{margin-top:3px;font-family:var(--serif);font-size:19px;font-weight:500}.play-progress-text{justify-self:end;color:var(--muted);font-family:var(--mono);font-size:10px}.play-progress-line{width:min(980px,calc(100% - 44px));height:3px;margin:0 auto;overflow:hidden;border-radius:999px;background:#6b5f461f}.play-progress-line span{display:block;height:100%;border-radius:inherit;background:var(--amber);transition:width .3s ease}.play-main{width:min(880px,calc(100% - 32px));margin:0 auto;padding:23px 0 150px}.play-statusbar{display:flex;align-items:center;gap:26px;margin-bottom:14px;padding:10px 16px;border:1px solid var(--line);border-radius:11px;background:#fffdf799}.play-statusbar>div{display:flex;align-items:center;gap:7px}.play-statusbar>div+div{padding-left:24px;border-left:1px solid var(--line)}.play-statusbar span{color:var(--muted);font-size:9px;letter-spacing:.05em}.play-statusbar strong{font-family:var(--mono);font-size:12px;font-weight:600}.play-statusbar .combo-on{color:var(--amber-dark)}.question-card{padding:clamp(22px,5vw,42px);border:1px solid var(--line);border-radius:22px;background:var(--surface);box-shadow:var(--shadow)}.question-meta{display:flex;align-items:center;flex-wrap:wrap;gap:9px;margin-bottom:24px;color:var(--muted);font-size:10px}.question-number{color:var(--amber-dark);font-family:var(--mono);font-size:10px;font-weight:700}.question-meta span+span:before{margin-right:9px;color:var(--line-strong);content:"·"}.question-stem{margin-bottom:28px;font-family:var(--serif);font-size:clamp(19px,2.5vw,24px);line-height:1.9}.option-list{display:flex;flex-direction:column;gap:10px}.option-button{display:grid;grid-template-columns:26px 22px minmax(0,1fr);align-items:center;gap:8px;width:100%;padding:14px 17px;border:1px solid var(--line);border-radius:12px;background:var(--surface-soft);text-align:left;transition:border-color .15s ease,background .15s ease,transform .12s ease}.option-button:not(:disabled):hover{transform:translate(2px);border-color:var(--line-strong);background:#fffaf0}.option-button.selected{border-color:var(--amber);background:#fff8e9;box-shadow:inset 0 0 0 1px var(--amber)}.option-button.locked{opacity:.8}.option-key{display:grid;place-items:center;width:22px;height:22px;border:1px solid var(--line);border-radius:5px;color:var(--muted);font-family:var(--mono);font-size:9px}.option-button.selected .option-key{color:#fff;border-color:var(--amber);background:var(--amber)}.option-letter{color:var(--amber-dark);font-family:var(--serif);font-size:15px;font-weight:700}.option-text{font-size:15px}.judge-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}.judge-button{display:flex;align-items:center;justify-content:center;gap:10px;min-height:76px;border:1px solid var(--line);border-radius:14px;background:var(--surface-soft);font-family:var(--serif);font-size:21px;transition:border-color .15s ease,background .15s ease}.judge-button:not(:disabled):hover{border-color:var(--line-strong);background:#fffaf0}.judge-button.selected{border-color:var(--amber);background:#fff8e9;box-shadow:inset 0 0 0 1px var(--amber)}.judge-key{color:var(--muted);font-family:var(--mono);font-size:9px}.solution-area{display:flex;flex-direction:column;gap:8px}.solution-area label{color:var(--muted);font-size:10px;font-weight:700;letter-spacing:.08em}.solution-area textarea{width:100%;padding:16px;resize:vertical;border:1px solid var(--line);border-radius:12px;outline:0;background:var(--surface-soft);font-family:var(--sans);font-size:14px;line-height:1.8}.solution-area textarea:focus{border-color:var(--amber);background:#fffdf7;box-shadow:0 0 0 3px #b4530917}.solution-area textarea:disabled{opacity:.8}.input-hint{color:var(--muted-light);font-size:9px}.recorded-note{display:flex;align-items:center;flex-wrap:wrap;gap:9px;margin-top:24px;padding:13px 15px;border:1px dashed #b9d8cf;border-radius:10px;color:#35645a;background:#f3f9f6;font-size:11px}.sealed-mark{padding:2px 7px;border-radius:999px;color:#fff;background:var(--teal);font-size:9px;font-weight:700}.keyboard-hints{display:flex;flex-wrap:wrap;gap:16px;margin-top:13px;padding:0 4px;color:var(--muted-light);font-size:9px}.keyboard-hints span:before{margin-right:5px;color:var(--line-strong);content:"⌨"}.play-footer{position:fixed;z-index:30;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:14px max(22px,calc((100vw - 880px)/2));border-top:1px solid var(--line);background:#f7f3e9f0;-webkit-backdrop-filter:blur(15px);backdrop-filter:blur(15px)}.play-footer-side{display:flex;align-items:center;gap:12px;color:var(--muted);font-size:9px}.play-primary{min-width:170px}.focus-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;padding:30px;text-align:center}.focus-empty h1{margin-bottom:8px;font-size:38px;font-weight:500}.focus-empty p{color:var(--muted)}.math-text{white-space:pre-wrap;overflow-wrap:anywhere}.math-inline{display:inline-block;max-width:100%;overflow-x:auto;overflow-y:hidden;vertical-align:bottom;overscroll-behavior:contain}.math-block{display:block;max-width:100%;margin:8px 0;overflow-x:auto;overflow-y:hidden;white-space:normal;overscroll-behavior:contain}.math-block .katex-display{margin:.35em 0;overflow-x:auto;overflow-y:hidden;padding:.1em 0}.katex{font-size:1.04em}.katex-display>.katex{white-space:normal}.result-page{max-width:1060px}.final-result-page{display:flex;flex-direction:column}.final-result-page>.back-link{order:0;align-self:flex-start}.final-result-page>.result-hero{order:1}.final-result-page>.result-metrics-grid{order:2}.final-result-page>.answer-review-section{order:3;margin-top:20px}.final-result-page>.result-compare-card{order:4}.final-result-page>.result-encouragement-section{order:5}.final-result-page>.result-two-col{order:6}.final-result-page>.result-actions{order:7}.result-hero{position:relative;padding:36px 36px 40px;overflow:hidden;border:1px solid var(--line);border-radius:24px;background:radial-gradient(circle at 50% 0%,rgba(180,83,9,.09),transparent 26rem),var(--surface);text-align:center;box-shadow:var(--shadow-soft)}.result-perfect .result-hero{background:radial-gradient(circle at 50% 0%,rgba(199,120,3,.17),transparent 30rem),linear-gradient(180deg,#fffdf7,#fbf4e5)}.result-eyebrow{color:var(--amber-dark);font-size:10px;font-weight:700;letter-spacing:.14em;text-transform:uppercase}.result-stars{display:flex;justify-content:center;gap:9px;margin:15px 0 12px}.result-star{color:#ddd4c3;font-size:clamp(48px,9vw,76px);line-height:1;transform:scale(.85);opacity:.65}.result-star.lit{color:#c27803;opacity:1;text-shadow:0 8px 22px rgba(194,120,3,.2);animation:star-pop .55s cubic-bezier(.18,.89,.32,1.28) both}@keyframes star-pop{0%{transform:scale(.35) rotate(-14deg);opacity:0}65%{transform:scale(1.14) rotate(3deg);opacity:1}to{transform:scale(1) rotate(0);opacity:1}}.result-hero h1{margin:8px 0 4px;font-size:clamp(36px,5vw,55px);font-weight:500}.result-subline{margin-bottom:8px;color:var(--muted);font-size:10px}.result-headline{margin:12px 0 4px;color:var(--amber-dark);font-family:var(--serif);font-size:20px}.result-encouragement-section{margin-bottom:16px;padding:22px 26px;border:1px solid #e2d3b5;border-radius:var(--radius);background:linear-gradient(135deg,#fffaf0,#fbf3e3)}.result-encouragement{max-width:800px;margin:8px 0 0;color:var(--ink-soft);font-family:var(--serif);font-size:17px;line-height:1.9}.record-flag{display:inline-flex;padding:4px 11px;border-radius:999px;color:#fff;background:var(--teal);font-size:9px;font-weight:700;letter-spacing:.05em}.record-flag.neutral{color:var(--muted);background:var(--surface-tint)}.result-metrics-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:11px;margin:16px 0}.metric-card{display:flex;flex-direction:column;padding:19px;border:1px solid var(--line);border-radius:15px;background:var(--surface)}.metric-card span{color:var(--muted);font-size:9px;letter-spacing:.06em}.metric-card strong{margin:4px 0 2px;font-family:var(--serif);font-size:27px;font-weight:500}.metric-card small{color:var(--muted-light);font-size:9px}.xp-metric strong{color:var(--amber-dark)}.result-compare-card{display:grid;grid-template-columns:1fr auto;gap:24px;margin-bottom:16px;padding:24px 26px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}.result-compare-card h2{margin:4px 0;font-size:28px;font-weight:500}.result-compare-card p{margin:0;color:var(--muted);font-size:12px}.compare-stars{display:flex;gap:24px}.compare-stars>div{display:flex;flex-direction:column;align-items:flex-end;gap:5px}.compare-stars span{color:var(--muted);font-size:9px}.next-star-hint{display:flex;flex-direction:column;gap:3px;grid-column:1 / -1;padding-top:14px;border-top:1px solid var(--line);font-size:11px}.next-star-hint strong{color:var(--amber-dark);font-size:10px}.next-star-hint span{color:var(--muted)}.result-two-col{display:grid;grid-template-columns:1fr;gap:16px;margin-bottom:16px}.advice-card,.xp-rank-card{padding:24px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}.advice-card h2,.xp-rank-card h2{margin:4px 0 8px;font-size:25px;font-weight:500}.suggestion-list{display:flex;flex-direction:column;gap:13px;margin:16px 0 0;padding:0;list-style:none;counter-reset:advice}.suggestion-list li{position:relative;padding-left:30px;color:var(--ink-soft);font-size:12px;line-height:1.7;counter-increment:advice}.suggestion-list li:before{position:absolute;top:1px;left:0;display:grid;place-items:center;width:19px;height:19px;border-radius:50%;color:var(--amber-dark);background:var(--amber-soft);font-family:var(--mono);font-size:8px;content:counter(advice)}.xp-rank-head{display:flex;align-items:flex-start;justify-content:space-between;gap:14px}.xp-rank-head p{margin:0;color:var(--muted);font-size:10px}.xp-big{color:var(--amber-dark);font-family:var(--serif);font-size:31px}.xp-rank-card .progress{margin:18px 0 7px}.rank-progress-copy{display:flex;justify-content:space-between;color:var(--muted);font-size:9px}.trial-note,.xp-zero-note{margin:12px 0 0;padding:8px 10px;border-radius:8px;color:var(--muted);background:var(--surface-soft);font-size:10px}.unlock-list{display:flex;flex-direction:column;gap:7px;margin-top:18px;padding-top:16px;border-top:1px solid var(--line)}.unlock-title{color:var(--muted);font-size:9px;font-weight:700;letter-spacing:.09em}.unlock-chip{display:flex;align-items:center;gap:8px;padding:8px 10px;border:1px solid #b9dcd4;border-radius:8px;background:#f0f9f6;color:var(--ink);font-size:11px;text-align:left}.unlock-chip span{padding:1px 5px;border-radius:3px;color:#fff;background:var(--teal);font-size:8px}.unlock-chip.pending{border-color:#e3cba3;background:#fdf5e5}.unlock-chip.pending span{background:var(--amber)}.chapter-clear-note{margin-top:4px;color:var(--muted);font-size:10px;line-height:1.6}.answer-review-section{margin-top:34px}.review-count{color:var(--muted);font-family:var(--mono);font-size:10px}.review-list{display:flex;flex-direction:column;gap:13px;margin-top:18px}.review-item{padding:22px 24px;border:1px solid var(--line);border-radius:16px;background:var(--surface)}.review-item-head{display:flex;align-items:center;flex-wrap:wrap;gap:9px;margin-bottom:14px}.review-number{color:var(--muted-light);font-family:var(--mono);font-size:9px}.review-tags{display:flex;align-items:center;flex-wrap:wrap;gap:5px}.result-badge,.pending-status{margin-left:auto;padding:3px 9px;border-radius:999px;font-size:9px;font-weight:700}.result-badge.correct{color:var(--teal);background:var(--teal-soft)}.result-badge.partial{color:var(--amber-dark);background:var(--amber-soft)}.result-badge.wrong{color:var(--red);background:var(--red-soft)}.review-time{color:var(--muted-light);font-family:var(--mono);font-size:9px}.review-stem{margin-bottom:15px;font-family:var(--serif);font-size:18px;line-height:1.8}.answer-pair{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:12px}.response-box,.correct-box,.reference-box{padding:13px 15px;border:1px solid var(--line);border-radius:10px;background:var(--surface-soft)}.response-label{display:block;margin-bottom:5px;color:var(--muted);font-size:9px;font-weight:700;letter-spacing:.07em}.response-content{font-size:12px;white-space:pre-wrap;overflow-wrap:anywhere}.response-content.empty,.empty-response{color:var(--muted-light);font-style:italic}.choice-response{display:inline-flex;align-items:baseline;flex-wrap:wrap;gap:6px;white-space:normal}.answer-option-letter{display:inline-grid;place-items:center;min-width:19px;height:19px;border:1px solid var(--line-strong);border-radius:4px;color:var(--amber-dark);font-family:var(--mono);font-size:9px}.solution-response{white-space:pre-wrap}.reference-answer{font-size:13px;line-height:1.7}.correct-box{border-color:#c9dfd9;background:#f4faf8}.explanation-box{margin-top:10px;padding:14px 16px;border-left:2px solid var(--line-strong);background:#fbf8f0;color:var(--ink-soft);font-size:12px;line-height:1.8}.explanation-box>span:first-child{display:block;margin-bottom:4px;color:var(--muted);font-size:9px;font-weight:700;letter-spacing:.08em}.result-actions{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-top:32px}.abandon-note{max-width:600px;margin:14px auto;padding:10px 14px;border-radius:8px;color:#7b4a18;background:#fdf0dc;font-size:11px}.pending-hero{padding-top:32px}.pending-star-display{display:flex;justify-content:center;gap:8px;margin:16px 0 8px}.pending-star-display span{color:#ded5c4;font-size:clamp(44px,8vw,68px);line-height:1}.pending-callout{display:flex;flex-direction:column;gap:3px;max-width:720px;margin:18px auto 0;padding:14px 18px;border:1px solid #e3cba3;border-radius:10px;background:#fdf5e5;text-align:left}.pending-callout strong{color:var(--amber-dark);font-family:var(--serif);font-size:17px;font-weight:500}.pending-callout span{color:#735b34;font-size:11px}.review-section{margin-top:30px}.auto-note{max-width:300px;color:var(--muted);font-size:10px;text-align:right}.pending-review-item .pending-status{color:var(--amber-dark);background:var(--amber-soft)}.pending-review-item .response-box{margin-bottom:12px}.reference-box{margin-top:12px;border-color:#d9c9a8;background:#fffbf2}.self-grade-row{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;margin-top:14px;padding-top:14px;border-top:1px solid var(--line)}.self-grade-row>span{color:var(--ink-soft);font-size:11px;font-weight:600}.segmented{display:inline-flex;padding:3px;border:1px solid var(--line);border-radius:999px;background:var(--surface-soft)}.segmented button{padding:6px 12px;border:0;border-radius:999px;background:transparent;color:var(--muted);font-size:10px;font-weight:700}.segmented button.active{color:#fff;background:var(--amber)}.pending-status-note{margin-top:8px;color:var(--muted);font-size:10px}.pending-final-bar{position:sticky;bottom:18px;display:flex;align-items:center;justify-content:space-between;gap:20px;margin-top:24px;padding:16px 20px;border:1px solid var(--line-strong);border-radius:16px;background:#fffdf7f2;box-shadow:var(--shadow);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.pending-final-bar>div{display:flex;align-items:baseline;gap:5px}.pending-final-bar strong{color:var(--amber-dark);font-family:var(--serif);font-size:25px;font-weight:500}.pending-final-bar span{color:var(--muted);font-size:10px}.pending-footnote{margin:13px 0 0;color:var(--muted);font-size:10px;text-align:center}.wrong-heading{align-items:flex-end}.wrong-summary{display:flex;gap:24px;padding:15px 20px;border:1px solid var(--line);border-radius:14px;background:#fffdf7b3}.wrong-summary>div{display:flex;flex-direction:column;align-items:flex-end}.wrong-summary strong{font-family:var(--serif);font-size:25px;font-weight:500;line-height:1.1}.wrong-summary span{color:var(--muted);font-size:9px}.trial-card{display:flex;align-items:center;justify-content:space-between;gap:26px;margin-bottom:15px;padding:25px 28px;overflow:hidden;border:1px solid #2f3d41;border-radius:20px;color:#f7f1e5;background:radial-gradient(circle at 92% 0%,rgba(180,83,9,.3),transparent 18rem),#263438}.trial-card.trial-due{background:radial-gradient(circle at 92% 0%,rgba(180,83,9,.4),transparent 20rem),linear-gradient(135deg,#2b373a,#202b2f)}.trial-kicker{display:flex;align-items:center;gap:7px;margin-bottom:5px;color:#d7a044;font-size:9px;font-weight:700;letter-spacing:.1em}.trial-dot{width:6px;height:6px;border-radius:50%;background:#d7a044}.trial-copy h2{margin:0 0 4px;font-size:33px;font-weight:500}.trial-copy p{max-width:700px;margin:0;color:#b7c0bd;font-size:11px}.trial-copy .small-note{display:block;margin-top:6px;color:#d9c7a7}.trial-actions{display:flex;flex-direction:column;align-items:flex-end;gap:6px;flex:0 0 auto}.trial-actions .button.primary{color:var(--ink);background:#f3e5cd;box-shadow:none}.trial-actions>span{color:#9eaaa7;font-size:9px}.mastery-panel{display:grid;grid-template-columns:1fr minmax(300px,.8fr);align-items:center;gap:30px;margin-bottom:14px;padding:20px 24px;border:1px solid var(--line);border-radius:15px;background:var(--surface)}.mastery-copy h2{margin:3px 0;font-size:24px;font-weight:500}.mastery-copy p{margin:0;color:var(--muted);font-size:11px}.mastery-copy strong{color:var(--ink)}.mastery-visual{display:flex;flex-direction:column;gap:5px}.mastery-visual>span{color:var(--muted);font-size:9px;text-align:right}.wrong-toolbar{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;margin:20px 0 14px}.filter-chips{display:flex;flex-wrap:wrap;gap:5px}.filter-chips button,.view-toggle button{padding:6px 10px;border:1px solid transparent;border-radius:999px;background:transparent;color:var(--muted);font-size:10px;font-weight:600}.filter-chips button:hover,.view-toggle button:hover{color:var(--ink);background:var(--surface)}.filter-chips button.active,.view-toggle button.active{color:var(--ink);border-color:var(--line);background:var(--surface)}.filter-chips button span{margin-left:3px;color:var(--muted-light);font-size:8px}.view-toggle{display:flex;flex:0 0 auto;padding:3px;border:1px solid var(--line);border-radius:999px;background:var(--surface-soft)}.wrong-list{display:flex;flex-direction:column;gap:12px}.wrong-item{padding:20px 22px;border:1px solid var(--line);border-radius:16px;background:var(--surface)}.wrong-item.is-due{border-color:#e3bfb7;box-shadow:inset 3px 0 0 var(--red)}.wrong-item-top{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:9px;margin-bottom:10px}.wrong-tags{display:flex;align-items:center;flex-wrap:wrap;gap:5px}.chapter-tag{color:var(--amber-dark);font-family:var(--serif);font-size:12px;font-weight:600}.due-pill{color:var(--muted);font-size:9px;font-weight:600}.due-pill.due{color:var(--red)}.wrong-stem{margin-bottom:13px;font-family:var(--serif);font-size:17px;line-height:1.8}.wrong-metrics{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:7px;margin-bottom:12px}.wrong-metrics>div{display:flex;flex-direction:column;padding:8px 10px;border-radius:8px;background:var(--surface-soft)}.wrong-metrics span{color:var(--muted);font-size:8px}.wrong-metrics strong{margin-top:1px;font-size:10px;font-weight:600}.wrong-details{margin-bottom:11px}.wrong-details summary{color:var(--amber-dark);font-size:10px;font-weight:700;cursor:pointer}.wrong-details summary:hover{text-decoration:underline;text-underline-offset:3px}.wrong-reference{margin-top:10px;padding:12px 14px;border:1px solid #d7e5e0;border-radius:9px;background:#f5faf8}.wrong-actions{display:flex;align-items:center;flex-wrap:wrap;gap:12px;padding-top:11px;border-top:1px solid var(--line)}.review-prompt{color:var(--muted);font-size:9px}.review-buttons{display:flex;gap:5px}.review-quality{padding:5px 11px;border:1px solid var(--line);border-radius:999px;background:transparent;font-size:9px;font-weight:700}.review-quality:hover{color:#fff}.review-quality.quality-1:hover{border-color:var(--red);background:var(--red)}.review-quality.quality-3:hover{border-color:var(--amber);background:var(--amber)}.review-quality.quality-5:hover{border-color:var(--teal);background:var(--teal)}.archive-button{margin-left:auto;color:var(--muted);font-size:9px}.wrong-empty{min-height:330px}.empty-mark{display:grid;place-items:center;width:54px;height:54px;margin-bottom:14px;border:1px solid var(--line-strong);border-radius:50%;color:var(--muted);font-family:var(--serif);font-size:24px}.modal-backdrop{position:fixed;z-index:100;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;padding:22px;background:#181d1e7a;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);animation:fade-in .18s ease both}@keyframes fade-in{0%{opacity:0}to{opacity:1}}.modal-card{width:min(520px,100%);max-height:min(88vh,900px);overflow:auto;border:1px solid var(--line);border-radius:20px;background:var(--surface);box-shadow:0 30px 90px #1217183d;animation:modal-in .22s cubic-bezier(.2,.8,.3,1) both}.modal-card.modal-wide{width:min(840px,100%)}@keyframes modal-in{0%{transform:translateY(14px) scale(.985);opacity:0}to{transform:translateY(0) scale(1);opacity:1}}.modal-head{position:sticky;top:0;z-index:3;display:flex;align-items:center;justify-content:space-between;padding:18px 22px;border-bottom:1px solid var(--line);background:#fffdf7f5;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.modal-head h2{margin:0;font-size:22px;font-weight:500}.modal-body{padding:22px}.modal-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:20px}.confirm-copy p{margin:0;color:var(--ink-soft);font-size:13px;line-height:1.8}.data-tabs{display:flex;gap:4px;padding:4px;margin-bottom:20px;border:1px solid var(--line);border-radius:999px;background:var(--surface-soft)}.data-tabs button{flex:1;padding:7px 12px;border:0;border-radius:999px;background:transparent;color:var(--muted);font-size:11px;font-weight:700}.data-tabs button.active{color:var(--ink);background:var(--surface);box-shadow:0 1px 5px #28221614}.data-summary{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-bottom:18px}.data-summary>div{display:flex;align-items:baseline;gap:4px;padding:10px 12px;border-radius:9px;background:var(--surface-soft)}.data-summary strong{font-family:var(--serif);font-size:22px;font-weight:500}.data-summary span{color:var(--muted);font-size:9px}.data-section{display:flex;align-items:flex-start;justify-content:space-between;gap:22px;padding:17px 0;border-top:1px solid var(--line)}.data-section h3{margin:0 0 4px;font-family:var(--sans);font-size:12px;font-weight:700}.data-section p{margin:0;color:var(--muted);font-size:10px;line-height:1.7}.data-section>.button{flex:0 0 auto}.danger-copy strong{color:var(--red)}.file-name{display:inline-block;margin-left:8px;color:var(--muted);font-size:9px}.restore-confirm{display:flex;align-items:center;flex-wrap:wrap;gap:9px;margin-top:10px;padding:9px 11px;border:1px solid #e5bfb7;border-radius:8px;background:#fdf2ef;color:#7b3026;font-size:10px}.form-error{margin-top:10px;padding:9px 11px;border:1px solid #ecc6be;border-radius:8px;color:var(--red);background:#fdf2ef;font-size:10px;line-height:1.7}.pre-wrap{white-space:pre-wrap}.data-footnote{margin:12px 0 0;padding-top:14px;border-top:1px solid var(--line);color:var(--muted-light);font-size:9px;text-align:center}.bank-intro{display:block}.bank-intro code{padding:1px 4px;border-radius:3px;background:var(--surface-tint);font-family:var(--mono);font-size:9px}.bank-actions{display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin-bottom:14px}.bank-editor-label{display:block;margin-bottom:6px;color:var(--muted);font-size:9px;font-weight:700;letter-spacing:.08em}.bank-editor{width:100%;padding:13px;resize:vertical;border:1px solid var(--line);border-radius:10px;outline:0;background:#fbf8f0;font-family:var(--mono);font-size:10px;line-height:1.7}.bank-editor:focus{border-color:var(--amber);background:#fffdf7}.bank-footer{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-top:12px}.bank-footer>span{color:var(--muted);font-size:9px}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:340px;padding:40px 24px;color:var(--muted);text-align:center}.empty-state h1,.empty-state h2{margin-bottom:8px;color:var(--ink);font-weight:500}.empty-state p{max-width:520px;margin-bottom:18px;font-size:12px}.result-error{min-height:60vh}.boot-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;padding:30px;text-align:center}.boot-mark{display:grid;place-items:center;width:62px;height:62px;border-radius:50%;color:#fff8e8;background:var(--ink);font-family:var(--serif);font-size:38px;font-style:italic}.boot-screen h1{margin:18px 0 4px;font-size:40px;font-weight:500}.boot-screen p{max-width:560px;color:var(--muted);font-size:11px}.boot-bar{width:180px;height:3px;margin-top:13px;overflow:hidden;border-radius:999px;background:#6b5f4626}.boot-bar span{display:block;width:40%;height:100%;border-radius:inherit;background:var(--amber);animation:boot-slide 1.15s ease-in-out infinite}@keyframes boot-slide{0%{transform:translate(-110%)}to{transform:translate(350%)}}.boot-error .boot-mark{color:var(--red);background:var(--red-soft);font-family:var(--sans);font-style:normal}.toast{position:fixed;z-index:200;bottom:26px;left:50%;max-width:min(90vw,540px);padding:10px 16px;transform:translate(-50%);border:1px solid #3b474a;border-radius:999px;color:#f9f4e8;background:#1e282bf2;box-shadow:0 12px 35px #14191a33;font-size:11px;text-align:center;animation:toast-in .2s ease both}@keyframes toast-in{0%{transform:translate(-50%,8px);opacity:0}to{transform:translate(-50%);opacity:1}}@media(max-width:1080px){.chapter-mini-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.dashboard-grid{grid-template-columns:1fr 1fr}.continue-card{grid-column:1 / -1}.level-detail-grid{grid-template-columns:minmax(0,1.35fr) minmax(260px,.7fr)}}@media(max-width:900px){.home-hero{grid-template-columns:1fr;gap:24px;padding-top:18px}.rank-card{min-height:330px}.hero-copy h1{font-size:clamp(46px,11vw,70px)}.chapter-panel-head{align-items:flex-start;flex-direction:column;gap:14px}.chapter-score{width:100%}.chapter-score>span{text-align:left}.level-track{grid-template-columns:1fr}.track-connector{display:none}.level-node,.node-lock-copy{min-height:0}.level-detail-grid{grid-template-columns:1fr}.level-question-preview{position:static}.level-hero{align-items:flex-start;flex-direction:column}.level-hero-side{align-items:flex-start;padding:14px 0 0;border-top:1px solid var(--line);border-left:0}.result-two-col{grid-template-columns:1fr}.result-metrics-grid{grid-template-columns:1fr 1fr}.mastery-panel{grid-template-columns:1fr;gap:16px}.trial-card{align-items:flex-start;flex-direction:column}.trial-actions{align-items:flex-start}.wrong-toolbar{flex-direction:column}.page-heading{align-items:flex-start;flex-direction:column}.map-summary{width:100%}.wrong-summary{width:100%;justify-content:space-between}.wrong-summary>div{align-items:flex-start}.chapter-mini-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:680px){.app-main{padding:22px 14px 46px}.header-inner{height:60px;padding:0 14px;gap:10px}.brand-text small{display:none}.brand-mark{width:33px;height:33px;font-size:20px}.brand-text strong{font-size:15px}.main-nav{gap:1px}.main-nav button{padding:7px 8px;font-size:11px}.rank-chip{display:none}.data-button{padding:6px 9px;font-size:10px}.home-hero{padding-top:12px}.hero-copy h1{font-size:clamp(42px,12.5vw,58px)}.lede{font-size:13px}.rank-card{min-height:310px;padding:22px}.rank-title strong{font-size:37px}.dashboard-grid{grid-template-columns:1fr}.continue-card,.review-card,.recent-card{min-height:210px}.chapter-mini-grid{grid-template-columns:1fr}.chapter-mini{min-height:172px}.page-heading h1{font-size:39px}.chapter-panel{padding:18px 15px}.chapter-title-block{align-items:flex-start;gap:10px}.chapter-index{width:40px;height:50px}.chapter-index strong{font-size:22px}.chapter-title-line h2{font-size:23px}.unlock-banner{align-items:flex-start;flex-direction:column;padding:18px}.level-hero{padding:20px}.level-hero h1{font-size:39px}.goal-card,.level-question-preview{padding:19px}.goal-metrics{grid-template-columns:1fr}.locked-panel{align-items:flex-start;flex-direction:column}.distribution-chip{flex:1}.level-detail-grid{gap:12px}.play-header{grid-template-columns:auto 1fr auto;gap:7px;padding:15px 14px 11px}.play-title strong{font-size:15px}.play-title span,.play-progress-text{font-size:8px}.play-exit{font-size:10px}.play-main{width:calc(100% - 20px);padding-top:14px;padding-bottom:160px}.play-statusbar{display:grid;grid-template-columns:1fr 1fr;gap:8px 12px;padding:10px 13px}.play-statusbar>div+div{padding-left:0;border-left:0}.play-statusbar>div{justify-content:space-between}.question-card{padding:20px 16px;border-radius:17px}.question-stem{font-size:18px}.option-button{grid-template-columns:22px 18px minmax(0,1fr);padding:12px}.option-text{font-size:14px}.judge-button{min-height:64px;font-size:18px}.keyboard-hints{display:none}.play-footer{align-items:stretch;flex-direction:column;gap:8px;padding:10px 12px max(10px,env(safe-area-inset-bottom))}.play-footer-side{justify-content:space-between;order:2}.play-primary{width:100%;min-height:48px;order:1}.result-hero{padding:27px 18px 30px}.result-hero h1{font-size:38px}.result-metrics-grid{gap:7px}.metric-card{padding:14px}.metric-card strong{font-size:22px}.result-compare-card{grid-template-columns:1fr;padding:19px}.compare-stars{justify-content:flex-start}.compare-stars>div{align-items:flex-start}.answer-pair{grid-template-columns:1fr}.review-item{padding:17px 15px}.review-stem{font-size:16px}.review-time{display:none}.result-badge{margin-left:0}.advice-card,.xp-rank-card{padding:19px}.pending-final-bar{align-items:stretch;flex-direction:column;gap:10px;bottom:8px}.pending-final-bar .button,.segmented{width:100%}.segmented button{flex:1}.self-grade-row{align-items:flex-start;flex-direction:column}.trial-card{padding:20px}.trial-copy h2{font-size:28px}.wrong-summary{gap:14px;padding:12px 14px}.wrong-metrics{grid-template-columns:1fr 1fr}.wrong-metrics>div:last-child{grid-column:1 / -1}.wrong-actions{align-items:flex-start}.archive-button{margin-left:0}.filter-chips{gap:3px}.filter-chips button{padding:5px 7px;font-size:9px}.modal-backdrop{align-items:flex-end;padding:0}.modal-card{width:100%;max-height:92vh;border-radius:20px 20px 0 0}.modal-body{padding:17px}.data-section{align-items:flex-start;flex-direction:column;gap:10px}.data-summary{grid-template-columns:1fr 1fr}.bank-footer{align-items:stretch;flex-direction:column}.result-actions{flex-direction:column}.result-actions .button{width:100%}.toast{bottom:86px;width:max-content;max-width:92vw}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}.review-explanation{margin-top:10px;border-top:1px dashed var(--line)}.review-explanation>summary{padding:10px 0 4px;color:var(--amber-dark);font-size:10px;font-weight:700;letter-spacing:.04em;cursor:pointer;list-style:none}.review-explanation>summary::-webkit-details-marker{display:none}.review-explanation>summary:before{content:"▸ "}.review-explanation[open]>summary:before{content:"▾ "}.review-explanation>summary:hover{text-decoration:underline}.review-explanation .explanation-box{margin-top:4px}.install-hint{display:none}@media(max-width:680px){.solution-area textarea,.bank-editor{font-size:16px;line-height:1.7}.install-hint{display:flex;align-items:flex-start;gap:12px;margin:14px 0 18px;padding:14px 15px;border:1px solid var(--line);border-radius:14px;background:#fffdf7e6}.install-hint strong{display:block;margin-bottom:4px;font-size:13px}.install-hint p{margin:0;color:var(--muted);font-size:11px;line-height:1.7}.install-hint .button{flex:none;align-self:center}}.app-header{padding-top:env(safe-area-inset-top)}.play-header{padding-top:calc(19px + env(safe-area-inset-top))}@media(max-width:680px){.modal-body{padding-bottom:calc(17px + env(safe-area-inset-bottom))}}.community-page{display:flex;flex-direction:column;gap:18px}.community-heading{align-items:flex-start}.community-heading-actions{display:flex;gap:8px;flex-wrap:wrap}.community-banner{padding:16px 18px;border:1px solid var(--line);border-radius:16px;background:#fffdf7b3}.community-banner strong{display:block;font-size:14px}.community-banner p{margin:6px 0 0;color:var(--muted);font-size:12px;line-height:1.7}.community-banner code{font-family:var(--mono);font-size:11px}.community-banner.unavailable{border-left:3px solid var(--red);background:var(--red-soft)}.community-banner.warn{border-left:3px solid var(--amber);background:#fdf6e8}.community-banner.info{border-left:3px solid var(--teal);background:#f2f8f5}.community-banner.offline{border-left:3px solid var(--muted)}.community-banner.inline{margin:12px 0}.community-notice{padding:11px 15px;border:1px solid rgba(180,83,9,.3);border-radius:12px;color:var(--amber-dark);background:#fdf3e4;font-size:12px}.community-notice.floating{position:fixed;z-index:120;bottom:100px;left:50%;max-width:min(92vw,480px);transform:translate(-50%);box-shadow:0 10px 30px #0000001f}.community-toolbar{display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;padding:14px 16px;border:1px solid var(--line);border-radius:16px;background:#fffdf799}.community-selects{display:flex;flex-wrap:wrap;gap:10px}.community-selects label{display:flex;gap:6px;align-items:center;color:var(--muted);font-size:11px}.community-selects select{padding:7px 10px;border:1px solid var(--line);border-radius:9px;background:var(--surface);font:inherit;font-size:12px;color:var(--ink)}.community-actions{display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between}.community-count{color:var(--muted);font-size:12px}.community-action-buttons{display:flex;flex-wrap:wrap;gap:8px}.community-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.community-card{display:flex;flex-direction:column;gap:12px;padding:18px;border:1px solid var(--line);border-radius:18px;background:var(--surface)}.community-card-head{display:flex;gap:10px;align-items:flex-start;justify-content:space-between}.community-tags{display:flex;flex-wrap:wrap;gap:6px}.community-report{flex:none;color:var(--muted);font-size:11px}.community-stem{color:var(--ink);font-family:var(--serif);font-size:15px;line-height:1.7}.community-card-foot{display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;padding-top:10px;border-top:1px dashed var(--line);color:var(--muted-light);font-size:10px}.community-more{display:flex;justify-content:center}.community-skeleton{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.skeleton-card{height:150px;border-radius:18px;background:linear-gradient(100deg,#f1ece1,#f8f4ea,#f1ece1);background-size:200% 100%;animation:community-shimmer 1.4s ease-in-out infinite}@keyframes community-shimmer{0%{background-position:100% 0}to{background-position:-100% 0}}.community-rules{padding:14px 18px;border:1px solid var(--line);border-radius:14px;background:#fffdf799;font-size:12px}.community-rules ul{margin:8px 0 0 18px;padding:0;color:var(--muted);line-height:1.8}.upload-grid{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(260px,.9fr);gap:20px;align-items:start}.upload-card{display:flex;flex-direction:column;padding:22px;border:1px solid var(--line);border-radius:20px;background:var(--surface)}.upload-preview{position:sticky;top:90px;display:flex;flex-direction:column;gap:10px;padding:20px;border:1px solid var(--line);border-radius:18px;background:#fbf8f0}.preview-stem{font-family:var(--serif);font-size:15px;line-height:1.8}.preview-meta{display:flex;justify-content:space-between;color:var(--muted);font-size:10px}.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px;color:var(--ink-soft);font-size:11px;font-weight:600}.field input,.field textarea,.field select{width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:10px;outline:0;background:#fffdf7;color:var(--ink);font:inherit;font-size:13px;font-weight:400}.field textarea{resize:vertical;line-height:1.7}.field input:focus,.field textarea:focus,.field select:focus{border-color:var(--amber);box-shadow:0 0 0 3px #b4530914}.field-hint{display:flex;gap:8px;justify-content:space-between;color:var(--muted-light);font-size:10px;font-weight:400}.field-error{color:var(--red);font-size:10px;font-style:normal;font-weight:400}.field-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.field-row.three{grid-template-columns:repeat(3,minmax(0,1fr))}.option-editor{display:flex;flex-direction:column;gap:8px}.option-editor-row{display:flex;gap:8px;align-items:center}.option-editor-row input{flex:1}.option-editor-actions{display:flex;gap:10px;align-items:center;margin-top:8px}.community-success{display:flex;flex-direction:column;gap:12px;align-items:center;max-width:640px;margin:40px auto;padding:34px;border:1px solid var(--line);border-radius:22px;background:var(--surface);text-align:center}.community-success h1{font-family:var(--serif);font-size:34px}.community-focus .play-title strong{max-width:40vw;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.community-skip{margin-top:8px;color:var(--muted);font-size:11px}.community-grade-page{display:flex;flex-direction:column;gap:16px;max-width:820px;margin:0 auto;padding-bottom:120px}.community-grade-head h1{margin:6px 0;font-family:var(--serif);font-size:34px}.community-grade-head p{color:var(--muted);font-size:12px;line-height:1.8}.community-grade-item{display:flex;flex-direction:column;gap:10px;padding:18px;border:1px solid var(--line);border-radius:16px;background:var(--surface)}.community-grade-tags{display:flex;flex-wrap:wrap;gap:6px}.community-result-hero{display:flex;flex-direction:column;gap:8px;align-items:flex-start;padding:26px;border:1px solid var(--line);border-radius:22px;background:radial-gradient(circle at 90% 10%,rgba(180,83,9,.08),transparent 22rem),var(--surface)}.community-result-hero h1{font-family:var(--serif);font-size:42px}.community-result-xp{display:flex;gap:8px;align-items:baseline}.community-result-xp strong{color:var(--amber-dark);font-family:var(--serif);font-size:46px}.community-result-xp span{color:var(--muted);font-size:11px}.community-result-list{display:flex;flex-direction:column;gap:12px}.community-result-foot{display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;margin-top:8px;color:var(--muted);font-size:10px}.community-wrong-note{color:var(--red)}.account-card{display:flex;flex-direction:column;gap:14px;padding:20px;border:1px solid var(--line);border-radius:18px;background:var(--surface)}.account-head{display:flex;gap:12px;align-items:flex-start;justify-content:space-between}.account-head h2{margin:4px 0;font-family:var(--serif);font-size:28px}.account-actions{display:flex;gap:8px}.account-forms{display:grid;grid-template-columns:minmax(0,1fr);gap:14px;max-width:560px}.account-form,.my-submission-list{display:flex;flex-direction:column;gap:10px}.my-submission{display:flex;flex-direction:column;gap:8px;padding:16px;border:1px solid var(--line);border-radius:14px;background:var(--surface)}.my-submission-stem{font-family:var(--serif);font-size:14px;line-height:1.7}.my-submission-foot{display:flex;justify-content:space-between;color:var(--muted);font-size:10px}.danger-text{color:var(--red)!important}.source-tag.community{border-color:#0f766e4d;background:#eef7f4;color:#0f766e}.home-community{display:flex;gap:20px;align-items:center;justify-content:space-between;margin-top:20px;padding:22px 24px;border:1px solid var(--line);border-radius:20px;background:linear-gradient(120deg,#fbf8f0,#f4efe2)}.home-community h2{margin:4px 0 6px;font-family:var(--serif);font-size:27px}.home-community p{max-width:640px;color:var(--muted);font-size:12px;line-height:1.8}.home-community-actions{display:flex;flex:none;flex-wrap:wrap;gap:8px}.map-community-entry{display:flex;gap:14px;align-items:center;justify-content:space-between;margin-top:14px;padding:14px 18px;border:1px solid var(--line);border-radius:14px;background:#fffdf7a6}.map-community-entry div{display:flex;flex-direction:column;gap:3px}.map-community-entry strong{font-family:var(--serif);font-size:17px}.map-community-entry span:last-child{color:var(--muted);font-size:11px}@media(max-width:900px){.community-list,.community-skeleton,.upload-grid{grid-template-columns:1fr}.upload-preview{position:static}.home-community{flex-direction:column;align-items:flex-start}}@media(max-width:680px){.main-nav button{padding:7px 6px;font-size:10px}.community-heading-actions{width:100%}.community-heading-actions .button{flex:1}.field-row,.field-row.three{grid-template-columns:1fr}.community-toolbar{flex-direction:column;align-items:stretch}.community-actions{flex-direction:column;align-items:flex-start}.community-action-buttons{width:100%}.community-action-buttons .button{flex:1}.community-grade-head h1{font-size:30px}.community-result-hero h1{font-size:34px}.map-community-entry{flex-direction:column;align-items:flex-start}}.scratch-fab{position:fixed;right:18px;bottom:86px;z-index:60;display:inline-flex;align-items:center;gap:6px;padding:11px 16px;border:1px solid var(--line-strong);border-radius:999px;background:#fffdf7f0;color:var(--ink);box-shadow:var(--shadow-soft);font-size:13px;font-weight:700;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.scratch-fab:hover{border-color:var(--amber);color:var(--amber-dark)}.scratchpad-panel{position:fixed;top:84px;right:16px;z-index:70;display:flex;flex-direction:column;gap:10px;width:min(380px,calc(100vw - 24px));max-height:calc(100vh - 100px);overflow-y:auto;padding:12px;border:1px solid var(--line);border-radius:18px;background:#fffdf7f0;box-shadow:0 24px 70px #2a231638;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s ease,visibility .2s ease,transform .2s ease;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}.scratchpad-panel.is-open{opacity:1;visibility:visible;pointer-events:auto}.scratchpad-head{display:flex;align-items:flex-start;justify-content:space-between;gap:10px;padding:4px 2px 2px;cursor:grab;-webkit-user-select:none;user-select:none;touch-action:none}.scratchpad-head:active{cursor:grabbing}.scratchpad-head div{display:flex;flex-direction:column;gap:1px}.scratchpad-kicker{color:var(--muted);font-size:9px;font-weight:700;letter-spacing:.16em;text-transform:uppercase}.scratchpad-head strong{font-family:var(--serif);font-size:18px}.scratchpad-toolbar{display:flex;flex-wrap:wrap;gap:5px}.scratch-tool{display:inline-flex;align-items:center;gap:5px;padding:6px 9px;border:1px solid var(--line);border-radius:999px;background:var(--surface-soft);color:var(--ink-soft);font-size:11px;font-weight:600}.scratch-tool.active{border-color:var(--ink);background:var(--ink);color:#fffdf7}.scratch-tool.clear{margin-left:auto;color:var(--red)}.scratch-swatch{width:10px;height:10px;border-radius:50%;border:1px solid rgba(0,0,0,.18)}.scratch-swatch.black{background:#1f1b16}.scratch-swatch.red{background:#c0392b}.scratch-swatch.eraser{background:#fff}.scratchpad-canvas{display:block;width:100%;height:auto;border:1px solid var(--line);border-radius:10px;background:#fff;touch-action:none;box-shadow:inset 0 0 0 1px #ffffffb3}.scratchpad-note{margin:0;color:var(--muted);font-size:10px;line-height:1.7}.scratch-open{margin-top:10px}.scratch-preview-image{display:block;width:100%;max-height:68vh;object-fit:contain;border:1px solid var(--line);border-radius:12px;background:#fff}.home-flashcards{display:flex;gap:20px;align-items:center;justify-content:space-between;margin-top:20px;padding:22px 24px;border:1px solid var(--line);border-radius:20px;background:linear-gradient(120deg,#efe8f7,#f8f4e9 62%)}.home-flashcards h2{margin:4px 0 6px;font-family:var(--serif);font-size:27px}.home-flashcards p{max-width:680px;color:var(--muted);font-size:12px;line-height:1.8}.home-flashcards-actions{display:flex;flex:none;flex-direction:column;align-items:flex-end;gap:7px}.flashcards-page{max-width:920px}.flashcards-head{display:flex;gap:24px;align-items:flex-end;justify-content:space-between;margin:10px 0 18px}.flashcards-head h1{margin:4px 0 6px;font-family:var(--serif);font-size:clamp(30px,4vw,44px);line-height:1.1}.flashcards-head p{max-width:620px;color:var(--muted);font-size:12px;line-height:1.8}.flashcards-stats{display:flex;flex:none;gap:22px}.flashcards-stats div{display:flex;flex-direction:column;align-items:flex-end;gap:1px}.flashcards-stats strong{font-family:var(--serif);font-size:30px;line-height:1}.flashcards-stats span{color:var(--muted);font-size:10px}.flashcards-progress{height:5px;margin-bottom:18px;overflow:hidden;border-radius:999px;background:var(--surface-tint)}.flashcards-progress span{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--violet),var(--amber));transition:width .35s ease}.flashcards-stage{perspective:1400px}.flashcard-scene{position:relative;width:100%;height:390px;outline:none;cursor:pointer}.flashcard-scene:focus-visible{border-radius:22px;box-shadow:0 0 0 3px #6d28d959}.flashcard-inner{position:absolute;top:0;right:0;bottom:0;left:0;transform-style:preserve-3d;transition:transform .58s cubic-bezier(.2,.75,.2,1)}.flashcard-scene.is-flipped .flashcard-inner{transform:rotateY(180deg)}.flashcard-face{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;gap:12px;padding:24px 26px;overflow-y:auto;border:1px solid var(--line);border-radius:22px;background:var(--surface);box-shadow:var(--shadow);backface-visibility:hidden;-webkit-backface-visibility:hidden}.flashcard-back{background:linear-gradient(160deg,#f7f2e5,#f1e8f8);transform:rotateY(180deg)}.flashcard-meta{display:flex;align-items:center;justify-content:space-between;gap:10px;color:var(--muted);font-size:10px;font-weight:600;letter-spacing:.08em;text-transform:uppercase}.flashcard-topic{padding:3px 8px;border-radius:999px;background:var(--violet-soft);color:var(--violet);letter-spacing:.04em}.flashcard-body{flex:1;display:flex;align-items:center;justify-content:center;overflow-y:auto}.flashcard-text{width:100%;font-family:var(--serif);font-size:clamp(19px,2.4vw,25px);line-height:1.85;text-align:center}.flashcard-text .math-inline,.flashcard-text .math-block{font-size:1.05em}.flashcard-hint{color:var(--muted-light);font-size:10px;letter-spacing:.1em;text-align:center;text-transform:uppercase}.flashcards-actions{display:flex;justify-content:center;gap:12px;margin-top:20px}.flashcards-actions .button{min-width:150px;justify-content:center}.flashcard-forgot{border:1px solid rgba(180,35,24,.35);background:var(--red-soft);color:var(--red)}.flashcard-forgot:hover{border-color:var(--red)}.flashcards-hint{margin-top:10px;color:var(--muted);font-size:11px;text-align:center}.flashcards-empty{display:flex;flex-direction:column;align-items:center;max-width:640px;margin:8vh auto 0;padding:40px 26px;border:1px solid var(--line);border-radius:24px;background:var(--surface);text-align:center;box-shadow:var(--shadow-soft)}.flashcards-empty-mark{display:grid;place-items:center;width:58px;height:58px;margin-bottom:14px;border-radius:50%;background:var(--ink);color:#fff8e8;font-family:var(--serif);font-size:30px}.flashcards-empty h1{margin:4px 0 8px;font-family:var(--serif);font-size:34px}.flashcards-empty p{max-width:500px;color:var(--muted);font-size:13px;line-height:1.8}.flashcards-empty-actions{display:flex;gap:10px;margin-top:18px}@media(max-width:720px){.scratch-fab{right:12px;bottom:76px;padding:10px 14px}.scratchpad-panel{top:76px;right:8px;width:calc(100vw - 16px);max-height:calc(100vh - 92px)}.home-flashcards{flex-direction:column;align-items:flex-start}.home-flashcards-actions{align-items:flex-start}.flashcards-head{flex-direction:column;align-items:flex-start}.flashcards-stats{gap:18px}.flashcards-stats div{align-items:flex-start}.flashcard-scene{height:430px}.flashcard-face{padding:18px 16px}.flashcards-actions .button{min-width:0;flex:1}.flashcards-empty{margin-top:5vh;padding:28px 18px}}.math-keyboard{margin-top:10px}.math-keyboard-toggle{display:inline-flex;align-items:center;gap:8px;padding:7px 12px;border:1px solid var(--line);border-radius:999px;background:var(--surface-soft);color:var(--ink-soft);font-size:11px;font-weight:700}.math-keyboard-toggle:hover{border-color:var(--violet);color:var(--violet)}.math-keyboard-toggle span{color:var(--muted);font-size:9px;font-weight:500}.math-keyboard-panel{margin-top:8px;padding:10px;border:1px solid var(--line);border-radius:14px;background:#fffdf7d9}.math-keyboard-grid{display:grid;grid-template-columns:repeat(8,minmax(0,1fr));gap:5px}.math-key{height:34px;padding:0 2px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink);font-family:var(--serif);font-size:16px;line-height:1}.math-key:hover{border-color:var(--violet);background:var(--violet-soft);color:var(--violet)}.math-keyboard-note{margin:8px 2px 0;color:var(--muted);font-size:10px;line-height:1.6}.solution-preview{margin-top:10px;padding:10px 12px;border-left:3px solid var(--violet);border-radius:0 10px 10px 0;background:var(--violet-soft)}.solution-preview-label{display:block;margin-bottom:3px;color:var(--violet);font-size:9px;font-weight:700;letter-spacing:.12em}.solution-preview-body{overflow-x:auto;color:var(--ink-soft);font-size:14px;line-height:1.8}.play-header-right{display:flex;align-items:center;justify-content:flex-end;gap:10px}.formula-trigger{flex:none;padding:6px 10px;border:1px solid var(--line);border-radius:999px;background:var(--surface);color:var(--ink-soft);font-size:10px;font-weight:700;white-space:nowrap}.formula-trigger:hover{border-color:var(--amber);color:var(--amber-dark)}.cheat-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:80;background:#1d272b52;opacity:0;visibility:hidden;transition:opacity .22s ease,visibility .22s ease;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.cheat-backdrop.is-open{opacity:1;visibility:visible}.cheat-drawer{position:fixed;top:0;right:0;z-index:81;display:flex;flex-direction:column;width:min(440px,100vw);height:100vh;border-left:1px solid var(--line);background:var(--surface);box-shadow:-24px 0 60px #2a23162e;transform:translate(100%);transition:transform .25s cubic-bezier(.2,.75,.2,1)}.cheat-drawer.is-open{transform:translate(0)}.cheat-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;padding:22px 22px 14px;border-bottom:1px solid var(--line)}.cheat-kicker{color:var(--amber-dark);font-size:9px;font-weight:700;letter-spacing:.14em}.cheat-head h2{margin:2px 0 4px;font-family:var(--serif);font-size:32px;line-height:1}.cheat-head p{margin:0;color:var(--muted);font-size:11px;line-height:1.7}.cheat-tabs{display:flex;gap:4px;padding:10px 16px;overflow-x:auto;border-bottom:1px solid var(--line)}.cheat-tabs button{flex:none;padding:6px 9px;border:1px solid transparent;border-radius:999px;background:transparent;color:var(--muted);font-size:10px;font-weight:600}.cheat-tabs button:hover{color:var(--ink);background:var(--surface-soft)}.cheat-tabs button.active{border-color:var(--line);background:var(--surface-soft);color:var(--ink)}.cheat-body{flex:1;overflow-y:auto;padding:4px 22px 20px}.cheat-entry{padding:13px 0;border-bottom:1px dashed var(--line)}.cheat-entry-head{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:10px;font-weight:700;letter-spacing:.08em;text-transform:uppercase}.cheat-formula{margin-top:5px;overflow-x:auto;color:var(--ink);font-size:15px;line-height:1.5}.cheat-note{margin:3px 0 0;color:var(--muted);font-size:10px}.cheat-foot{padding:10px 22px calc(12px + env(safe-area-inset-bottom));border-top:1px solid var(--line);color:var(--muted-light);font-size:9px;letter-spacing:.08em}.wrong-export{margin-left:auto;flex:none}.pdf-export-root{line-height:1.7}.pdf-header{padding-bottom:14px;margin-bottom:14px;border-bottom:2px solid #1d272b}.pdf-brand{color:#b45309;font-size:10px;font-weight:700;letter-spacing:.16em}.pdf-header h1{margin:3px 0 4px;font-family:Songti SC,SimSun,serif;font-size:28px;line-height:1.1}.pdf-header p{margin:0;color:#6d746f;font-size:10px}.pdf-note{margin-top:3px!important;color:#8a8f88!important}.pdf-item{margin:0 0 18px;padding:14px 16px;border:1px solid #d8d0bf;border-radius:10px;break-inside:avoid;page-break-inside:avoid;background:#fffdf7}.pdf-item-head{display:flex;align-items:center;gap:8px;color:#6d746f;font-size:9px;font-weight:700}.pdf-index{display:inline-grid;place-items:center;width:22px;height:22px;border-radius:50%;background:#1d272b;color:#fff8e8;font-family:Courier New,monospace;font-size:10px}.pdf-topic{margin-left:auto;color:#6d28d9}.pdf-stem{margin:10px 0;font-size:13px;line-height:1.8}.pdf-section{margin-top:9px}.pdf-label{margin-bottom:4px;color:#8a8f88;font-size:8px;font-weight:700;letter-spacing:.1em;text-transform:uppercase}.pdf-options{display:grid;grid-template-columns:1fr 1fr;gap:4px 12px}.pdf-option{display:flex;gap:5px;align-items:flex-start;padding:4px 6px;border:1px solid #e4ddcf;border-radius:6px;font-size:11px;line-height:1.6}.pdf-option strong{flex:none;color:#344147}.pdf-option.correct{border-color:#0f766e;background:#d7ece7}.pdf-option em{margin-left:auto;color:#0f766e;font-style:normal;font-weight:700}.pdf-answer-text,.pdf-explanation{font-size:12px;line-height:1.75}.pdf-explanation{color:#344147}.pdf-scratch{margin-top:10px}.pdf-scratch img{display:block;width:100%;max-height:300px;object-fit:contain;border:1px solid #d8d0bf;border-radius:6px;background:#fff}.pdf-workarea{margin-top:10px}.pdf-lines{display:flex;flex-direction:column;gap:14px;padding-top:8px}.pdf-lines span{display:block;height:1px;border-bottom:1px solid #d8d0bf}.pdf-footer{margin-top:16px;padding-top:8px;border-top:1px solid #d8d0bf;color:#8a8f88;font-size:8px;letter-spacing:.1em;text-align:center}.pdf-export-status{position:fixed;top:16px;left:50%;z-index:9999;transform:translate(-50%);padding:9px 16px;border-radius:999px;background:#1d272b;color:#fff8e8;font-size:11px;font-weight:600;box-shadow:0 8px 24px #00000040}.pdf-math-inline,.pdf-math-block{color:#1d272b}.pdf-math-block{margin:4px 0;overflow-x:auto}@media(max-width:680px){.play-header-right{gap:5px}.formula-trigger{padding:5px 7px;font-size:9px}.math-keyboard-grid{grid-template-columns:repeat(6,minmax(0,1fr))}.wrong-toolbar{flex-wrap:wrap}.wrong-export{width:100%;margin-left:0}.cheat-head{padding:18px 16px 12px}.cheat-body{padding:4px 16px 18px}.pdf-options{grid-template-columns:1fr}}.targeted-zone{margin-top:18px;padding:20px 22px;border:1px solid rgba(180,83,9,.38);border-radius:20px;background:linear-gradient(120deg,#fbf3e4,#f6efe2 55%,#f2e9dc);box-shadow:var(--shadow-soft)}.targeted-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:18px}.targeted-heading h2{margin:3px 0 5px;font-family:var(--serif);font-size:27px}.targeted-heading p{max-width:720px;margin:0;color:var(--muted);font-size:11px;line-height:1.8}.targeted-count{flex:none;padding:5px 10px;border-radius:999px;background:var(--surface);color:var(--amber-dark);font-size:10px;font-weight:700}.targeted-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:10px;margin-top:14px}.targeted-card{display:flex;flex-direction:column;gap:5px;padding:14px 16px;border:1px solid var(--line);border-radius:14px;background:#fffdf7cc}.targeted-card-top{display:flex;justify-content:space-between;gap:8px;color:var(--muted);font-size:9px;font-weight:700;letter-spacing:.08em}.targeted-card h3{margin:2px 0;font-family:var(--serif);font-size:22px}.targeted-card p{flex:1;margin:0;color:var(--muted);font-size:10px;line-height:1.7}.targeted-card .button{align-self:flex-start;margin-top:6px}.home-exam{display:flex;gap:20px;align-items:center;justify-content:space-between;margin-top:20px;padding:22px 24px;border:1px solid rgba(15,118,110,.25);border-radius:20px;background:linear-gradient(120deg,#e8f2ee,#f8f4e9 62%)}.home-exam h2{margin:4px 0 6px;font-family:var(--serif);font-size:27px}.home-exam p{max-width:700px;color:var(--muted);font-size:12px;line-height:1.8}.home-exam-actions{display:flex;flex:none;flex-direction:column;align-items:flex-end;gap:7px}.exam-page{max-width:980px}.exam-hero{padding:28px 30px;border:1px solid var(--line);border-radius:24px;background:radial-gradient(circle at 90% 10%,rgba(15,118,110,.13),transparent 18rem),linear-gradient(125deg,#fbf8ef,#f1ece0);box-shadow:var(--shadow-soft)}.exam-hero h1{max-width:780px;margin:4px 0 10px;font-family:var(--serif);font-size:clamp(32px,4.5vw,50px);line-height:1.08}.exam-hero p{max-width:760px;margin:0;color:var(--muted);font-size:13px;line-height:1.8}.exam-hero-rules{display:flex;flex-wrap:wrap;gap:6px;margin-top:16px}.exam-hero-rules span{padding:5px 9px;border:1px solid var(--line);border-radius:999px;background:#fffdf7b3;color:var(--ink-soft);font-size:10px;font-weight:600}.exam-resume,.exam-last-result{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-top:18px;padding:18px 22px;border:1px solid rgba(180,83,9,.35);border-radius:18px;background:#fbf3e5}.exam-resume h2,.exam-last-result h2{margin:2px 0 3px;font-family:var(--serif);font-size:26px}.exam-resume p,.exam-last-result p{margin:0;color:var(--muted);font-size:11px}.exam-resume-side{display:flex;align-items:center;gap:16px}.exam-resume-clock{display:flex;flex-direction:column;align-items:flex-end;gap:1px}.exam-resume-clock span{color:var(--muted);font-size:9px}.exam-resume-clock strong{font-family:var(--mono);font-size:20px}.exam-options{margin-top:24px}.exam-difficulty-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.exam-difficulty-card{display:flex;flex-direction:column;gap:8px;padding:18px;border:1px solid var(--line);border-radius:16px;background:var(--surface);box-shadow:var(--shadow-soft)}.exam-difficulty-top{display:flex;justify-content:space-between;gap:8px;color:var(--muted);font-size:9px;font-weight:700;letter-spacing:.08em}.exam-difficulty-top strong{color:var(--ink-soft)}.exam-difficulty-card p{margin:0;color:var(--muted);font-size:11px;line-height:1.75}.exam-difficulty-card ul{margin:0;padding-left:16px;color:var(--ink-soft);font-size:10px;line-height:1.9}.exam-difficulty-card .button{margin-top:auto;justify-content:center}.exam-rules-card{display:grid;grid-template-columns:240px 1fr;gap:24px;margin-top:18px;padding:20px 24px;border:1px solid var(--line);border-radius:18px;background:var(--surface-soft)}.exam-rules-card h2{margin:3px 0 0;font-family:var(--serif);font-size:25px;line-height:1.2}.exam-rules-card ol{margin:0;padding-left:18px;color:var(--ink-soft);font-size:11px;line-height:1.9}.exam-play-header{grid-template-columns:1fr auto 1fr}.exam-timer{display:flex;flex-direction:column;align-items:flex-end;gap:0;justify-self:end}.exam-timer span{color:var(--muted);font-size:8px;letter-spacing:.12em}.exam-timer strong{color:var(--ink);font-family:var(--mono);font-size:22px;line-height:1.1}.exam-timer.urgent strong{color:var(--red)}.exam-main{max-width:900px}.exam-question-card{min-height:360px}.exam-nav{display:grid;grid-template-columns:repeat(8,minmax(0,1fr));gap:6px;width:100%;margin:14px auto 0}.exam-nav-button{height:32px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--muted);font-family:var(--mono);font-size:10px;font-weight:700}.exam-nav-button.answered{border-color:#0f766e66;background:var(--teal-soft);color:var(--teal)}.exam-nav-button.current{border-color:var(--ink);background:var(--ink);color:#fff8e7}.exam-footer{align-items:center}.exam-footer .play-footer-side{display:flex;gap:14px;align-items:center}.exam-footer .text-button:disabled{cursor:not-allowed;opacity:.4}.exam-result-hero{padding:24px 28px;border:1px solid var(--line);border-radius:22px;background:linear-gradient(125deg,#fbf8ef,#eef4f0);text-align:center;box-shadow:var(--shadow-soft)}.exam-result-hero h1{margin:4px 0 6px;font-family:var(--serif);font-size:clamp(32px,4vw,46px)}.exam-result-hero p{margin:0;color:var(--muted);font-size:11px}.exam-score-display{display:flex;align-items:baseline;justify-content:center;gap:8px;margin:14px 0 4px}.exam-score-display strong{font-family:var(--serif);font-size:72px;line-height:.95;color:var(--ink)}.exam-score-display span{color:var(--muted);font-size:16px}.exam-report-metrics{display:flex;justify-content:center;gap:28px;margin-top:14px}.exam-report-metrics div{display:flex;flex-direction:column;align-items:center;gap:2px}.exam-report-metrics span{color:var(--muted);font-size:9px}.exam-report-metrics strong{font-family:var(--serif);font-size:22px}.exam-section-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-top:16px}.exam-stat-card{display:flex;flex-direction:column;gap:3px;padding:14px 16px;border:1px solid var(--line);border-radius:14px;background:var(--surface)}.exam-stat-card span{color:var(--muted);font-size:9px;font-weight:700;letter-spacing:.1em}.exam-stat-card strong{font-family:var(--serif);font-size:24px}.exam-stat-card small{color:var(--muted);font-size:10px}.exam-wrong-report{margin-top:24px}.exam-wrong-list{display:flex;flex-direction:column;gap:12px}.exam-wrong-item{padding:16px 18px;border:1px solid var(--line);border-radius:14px;background:var(--surface)}.exam-perfect-note{padding:22px;border:1px dashed var(--line-strong);border-radius:14px;color:var(--teal);font-family:var(--serif);font-size:18px;text-align:center}.exam-self-grade-list{margin-top:18px}.exam-self-grade-item{margin-top:12px;padding:16px 18px;border:1px solid var(--line);border-radius:16px;background:var(--surface)}.exam-self-grade-head{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:8px;color:var(--muted);font-size:10px;font-weight:700}@media(max-width:820px){.home-exam,.exam-resume,.exam-last-result{flex-direction:column;align-items:flex-start}.home-exam-actions,.exam-resume-side{align-items:flex-start;flex-wrap:wrap}.exam-difficulty-grid{grid-template-columns:1fr}.exam-rules-card{grid-template-columns:1fr;gap:10px}.targeted-heading{flex-direction:column}.exam-nav{grid-template-columns:repeat(4,minmax(0,1fr))}.exam-section-stats{grid-template-columns:1fr}.exam-report-metrics{gap:18px}.exam-score-display strong{font-size:58px}.exam-play-header{grid-template-columns:1fr auto}.exam-play-header .play-title{display:none}}.profile-title{display:inline-flex;align-items:center;margin-top:6px;padding:3px 8px;border:1px solid rgba(244,223,195,.35);border-radius:999px;color:var(--amber-soft);font-size:9px;font-weight:700;letter-spacing:.06em}.home-achievements{display:flex;gap:20px;align-items:center;justify-content:space-between;margin-top:20px;padding:22px 24px;border:1px solid rgba(109,40,217,.22);border-radius:20px;background:linear-gradient(120deg,#f0eaf9,#f8f4e9 65%)}.home-achievements h2{margin:4px 0 6px;font-family:var(--serif);font-size:27px}.home-achievements p{max-width:700px;color:var(--muted);font-size:12px;line-height:1.8}.achievements-page{max-width:940px}.achievements-head{display:flex;gap:20px;align-items:flex-end;justify-content:space-between;margin:10px 0 20px}.achievements-head h1{margin:4px 0 6px;font-family:var(--serif);font-size:clamp(34px,5vw,50px);line-height:1.05}.achievements-head p{max-width:620px;color:var(--muted);font-size:12px;line-height:1.8}.achievements-count{display:flex;align-items:baseline;gap:4px;flex:none}.achievements-count strong{font-family:var(--serif);font-size:44px;line-height:1}.achievements-count span{color:var(--muted);font-size:10px}.achievement-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:12px}.achievement-card{display:flex;gap:14px;align-items:flex-start;padding:18px;border:1px solid var(--line);border-radius:18px;background:var(--surface);box-shadow:var(--shadow-soft)}.achievement-card.locked{background:var(--surface-soft);filter:grayscale(.7);opacity:.72}.achievement-medal{display:grid;place-items:center;width:54px;height:54px;flex:none;border-radius:50%;border:2px solid var(--line-strong);background:var(--surface-tint);color:var(--muted);font-family:var(--serif);font-size:24px;font-weight:700}.achievement-card.unlocked .achievement-medal{border-color:var(--amber);background:radial-gradient(circle at 35% 25%,#fff6df,#f4dfc3);color:var(--amber-dark);box-shadow:0 0 0 5px #b453091a}.achievement-copy{flex:1;display:flex;flex-direction:column;gap:4px}.achievement-state{color:var(--muted);font-size:8px;font-weight:700;letter-spacing:.14em;text-transform:uppercase}.achievement-card.unlocked .achievement-state{color:var(--teal)}.achievement-copy h2{margin:0;font-family:var(--serif);font-size:24px}.achievement-copy p{margin:0;color:var(--muted);font-size:11px;line-height:1.7}.achievement-progress{display:flex;align-items:center;gap:8px;margin-top:3px}.achievement-progress>span{flex:none;color:var(--muted);font-family:var(--mono);font-size:9px}.achievement-date{color:var(--muted-light);font-size:9px}.blind-box-fab{position:fixed;left:18px;bottom:22px;z-index:55;display:flex;align-items:center;gap:10px;padding:10px 14px;border:1px solid var(--amber);border-radius:16px;background:#fffdf7f5;box-shadow:var(--shadow);text-align:left;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.blind-box-fab.claimed{border-color:var(--line);filter:grayscale(.8);opacity:.72}.blind-box-fab-copy{display:flex;flex-direction:column;gap:0}.blind-box-fab-copy strong{font-family:var(--serif);font-size:16px}.blind-box-fab-copy small{color:var(--muted);font-size:9px}.blind-box-fab-icon{position:relative;display:block;width:40px;height:38px;flex:none;animation:blind-shake 1.6s ease-in-out infinite}.blind-box-fab.claimed .blind-box-fab-icon{animation:none}.blind-box-fab.opening .blind-box-fab-icon{animation:blind-shake .45s ease-in-out infinite}.blind-box-fab-lid{position:absolute;left:2px;top:0;width:36px;height:10px;border-radius:4px 4px 2px 2px;background:var(--amber)}.blind-box-fab-body{position:absolute;left:4px;bottom:0;display:grid;place-items:center;width:32px;height:27px;border:2px solid var(--amber);border-radius:3px 3px 6px 6px;background:var(--amber-soft);color:var(--amber-dark);font-family:var(--serif);font-size:17px;font-weight:700}.blind-box-stage{display:flex;flex-direction:column;align-items:center;gap:16px;padding:8px 4px 4px;text-align:center}.blind-box-big{position:relative;width:120px;height:120px;animation:blind-shake 1.6s ease-in-out infinite}.blind-box-big-lid{position:absolute;left:8px;top:2px;width:104px;height:28px;border-radius:8px 8px 4px 4px;background:linear-gradient(120deg,#c46a12,var(--amber));box-shadow:0 4px #8a3f0740;transition:transform .5s ease}.blind-box-big-body{position:absolute;left:14px;top:28px;display:grid;place-items:center;width:92px;height:88px;border:3px solid var(--amber);border-radius:4px 4px 12px 12px;background:linear-gradient(150deg,#f9ebd2,var(--amber-soft));color:var(--amber-dark);font-family:var(--serif);font-size:44px;font-weight:700;transition:transform .5s ease}.blind-box-big.is-opening{animation:blind-shake .35s ease-in-out infinite}.blind-box-big.is-open .blind-box-big-lid{transform:translateY(-22px) rotate(-9deg)}.blind-box-big.is-open .blind-box-big-body{transform:scale(.95)}.blind-reward{display:flex;flex-direction:column;align-items:center;gap:6px;max-width:420px}.blind-reward strong{font-family:var(--serif);font-size:28px;line-height:1.3}.blind-reward p{margin:0;color:var(--muted);font-size:11px}.blind-reward .button{margin-top:6px}.blind-opening-copy strong{font-family:var(--serif);font-size:24px}.blind-opening-copy p{margin:2px 0 0;color:var(--muted);font-size:11px}@keyframes blind-shake{0%,to{transform:rotate(-4deg)}50%{transform:rotate(4deg)}}@media(max-width:720px){.home-achievements,.achievements-head{flex-direction:column;align-items:flex-start}.achievement-grid{grid-template-columns:1fr}.blind-box-fab{left:10px;bottom:12px;padding:8px 10px}.blind-box-fab-copy small{display:none}}.install-fab{position:fixed;right:18px;bottom:22px;z-index:55;display:flex;align-items:center;gap:9px;padding:9px 13px;border:1px solid var(--line-strong);border-radius:14px;background:#fffdf7f5;box-shadow:var(--shadow-soft);text-align:left;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.install-fab:hover{border-color:var(--amber)}.install-fab-icon{display:grid;place-items:center;width:30px;height:30px;flex:none;border-radius:50%;background:var(--ink);color:#fff8e7;font-family:var(--mono);font-size:17px;font-weight:700}.install-fab span:last-child{display:flex;flex-direction:column;gap:0}.install-fab strong{font-family:var(--serif);font-size:14px}.install-fab small{color:var(--muted);font-size:9px}.install-help{display:flex;flex-direction:column;gap:12px}.install-help p{margin:0;color:var(--ink-soft);font-size:13px;line-height:1.85}.install-help-tips{display:flex;flex-direction:column;gap:4px;padding:10px 12px;border-left:3px solid var(--amber);border-radius:0 8px 8px 0;background:var(--surface-soft);color:var(--muted);font-size:10px;line-height:1.7}.install-help .button{align-self:flex-start}.install-help-actions{display:flex;flex-wrap:wrap;gap:8px}@media(max-width:720px){.install-fab{right:10px;bottom:12px;padding:7px 10px}.install-fab small{display:none}}
