@font-face{font-display:block;font-family:KaTeX_AMS;font-style:normal;font-weight:400;src:url(/_astro/KaTeX_AMS-Regular.BQhdFMY1.woff2) format("woff2"),url(/_astro/KaTeX_AMS-Regular.DMm9YOAa.woff) format("woff"),url(/_astro/KaTeX_AMS-Regular.DRggAlZN.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Caligraphic;font-style:normal;font-weight:700;src:url(/_astro/KaTeX_Caligraphic-Bold.Dq_IR9rO.woff2) format("woff2"),url(/_astro/KaTeX_Caligraphic-Bold.BEiXGLvX.woff) format("woff"),url(/_astro/KaTeX_Caligraphic-Bold.ATXxdsX0.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Caligraphic;font-style:normal;font-weight:400;src:url(/_astro/KaTeX_Caligraphic-Regular.Di6jR-x-.woff2) format("woff2"),url(/_astro/KaTeX_Caligraphic-Regular.CTRA-rTL.woff) format("woff"),url(/_astro/KaTeX_Caligraphic-Regular.wX97UBjC.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Fraktur;font-style:normal;font-weight:700;src:url(/_astro/KaTeX_Fraktur-Bold.CL6g_b3V.woff2) format("woff2"),url(/_astro/KaTeX_Fraktur-Bold.BsDP51OF.woff) format("woff"),url(/_astro/KaTeX_Fraktur-Bold.BdnERNNW.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Fraktur;font-style:normal;font-weight:400;src:url(/_astro/KaTeX_Fraktur-Regular.CTYiF6lA.woff2) format("woff2"),url(/_astro/KaTeX_Fraktur-Regular.Dxdc4cR9.woff) format("woff"),url(/_astro/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(/_astro/KaTeX_Main-Bold.Cx986IdX.woff2) format("woff2"),url(/_astro/KaTeX_Main-Bold.Jm3AIy58.woff) format("woff"),url(/_astro/KaTeX_Main-Bold.waoOVXN0.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:italic;font-weight:700;src:url(/_astro/KaTeX_Main-BoldItalic.DxDJ3AOS.woff2) format("woff2"),url(/_astro/KaTeX_Main-BoldItalic.SpSLRI95.woff) format("woff"),url(/_astro/KaTeX_Main-BoldItalic.DzxPMmG6.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:italic;font-weight:400;src:url(/_astro/KaTeX_Main-Italic.NWA7e6Wa.woff2) format("woff2"),url(/_astro/KaTeX_Main-Italic.BMLOBm91.woff) format("woff"),url(/_astro/KaTeX_Main-Italic.3WenGoN9.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:normal;font-weight:400;src:url(/_astro/KaTeX_Main-Regular.B22Nviop.woff2) format("woff2"),url(/_astro/KaTeX_Main-Regular.Dr94JaBh.woff) format("woff"),url(/_astro/KaTeX_Main-Regular.ypZvNtVU.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Math;font-style:italic;font-weight:700;src:url(/_astro/KaTeX_Math-BoldItalic.CZnvNsCZ.woff2) format("woff2"),url(/_astro/KaTeX_Math-BoldItalic.iY-2wyZ7.woff) format("woff"),url(/_astro/KaTeX_Math-BoldItalic.B3XSjfu4.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Math;font-style:italic;font-weight:400;src:url(/_astro/KaTeX_Math-Italic.t53AETM-.woff2) format("woff2"),url(/_astro/KaTeX_Math-Italic.DA0__PXp.woff) format("woff"),url(/_astro/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(/_astro/KaTeX_SansSerif-Bold.D1sUS0GD.woff2) format("woff2"),url(/_astro/KaTeX_SansSerif-Bold.DbIhKOiC.woff) format("woff"),url(/_astro/KaTeX_SansSerif-Bold.CFMepnvq.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:italic;font-weight:400;src:url(/_astro/KaTeX_SansSerif-Italic.C3H0VqGB.woff2) format("woff2"),url(/_astro/KaTeX_SansSerif-Italic.DN2j7dab.woff) format("woff"),url(/_astro/KaTeX_SansSerif-Italic.YYjJ1zSn.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:normal;font-weight:400;src:url(/_astro/KaTeX_SansSerif-Regular.DDBCnlJ7.woff2) format("woff2"),url(/_astro/KaTeX_SansSerif-Regular.CS6fqUqJ.woff) format("woff"),url(/_astro/KaTeX_SansSerif-Regular.BNo7hRIc.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Script;font-style:normal;font-weight:400;src:url(/_astro/KaTeX_Script-Regular.D3wIWfF6.woff2) format("woff2"),url(/_astro/KaTeX_Script-Regular.D5yQViql.woff) format("woff"),url(/_astro/KaTeX_Script-Regular.C5JkGWo-.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size1;font-style:normal;font-weight:400;src:url(/_astro/KaTeX_Size1-Regular.mCD8mA8B.woff2) format("woff2"),url(/_astro/KaTeX_Size1-Regular.C195tn64.woff) format("woff"),url(/_astro/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(/_astro/KaTeX_Size2-Regular.Dy4dx90m.woff2) format("woff2"),url(/_astro/KaTeX_Size2-Regular.oD1tc_U0.woff) format("woff"),url(/_astro/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(/_astro/KaTeX_Size3-Regular.CTq5MqoE.woff) format("woff"),url(/_astro/KaTeX_Size3-Regular.DgpXs0kz.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size4;font-style:normal;font-weight:400;src:url(/_astro/KaTeX_Size4-Regular.Dl5lxZxV.woff2) format("woff2"),url(/_astro/KaTeX_Size4-Regular.BF-4gkZK.woff) format("woff"),url(/_astro/KaTeX_Size4-Regular.DWFBv043.ttf) format("truetype")}@font-face{font-display:block;font-family:KaTeX_Typewriter;font-style:normal;font-weight:400;src:url(/_astro/KaTeX_Typewriter-Regular.CO6r4hn1.woff2) format("woff2"),url(/_astro/KaTeX_Typewriter-Regular.C0xS9mPB.woff) format("woff"),url(/_astro/KaTeX_Typewriter-Regular.D3Ib7_Hf.ttf) format("truetype")}.katex{font: 1.21em KaTeX_Main,Times New Roman,serif;line-height:1.2;position:relative;text-indent:0;text-rendering:auto}.katex *{-ms-high-contrast-adjust:none!important;border-color:currentColor}.katex .katex-version:after{content:"0.16.45"}.katex .katex-mathml{clip:rect(1px,1px,1px,1px);border:0;height:1px;overflow:hidden;padding:0;position:absolute;width:1px}.katex .katex-html>.newline{display:block}.katex .base{position:relative;white-space:nowrap;width:-moz-min-content;width:min-content}.katex .base,.katex .strut{display:inline-block}.katex .textbf{font-weight:700}.katex .textit{font-style:italic}.katex .textrm{font-family:KaTeX_Main}.katex .textsf{font-family:KaTeX_SansSerif}.katex .texttt{font-family:KaTeX_Typewriter}.katex .mathnormal{font-family:KaTeX_Math;font-style:italic}.katex .mathit{font-family:KaTeX_Main;font-style:italic}.katex .mathrm{font-style:normal}.katex .mathbf{font-family:KaTeX_Main;font-weight:700}.katex .boldsymbol{font-family:KaTeX_Math;font-style:italic;font-weight:700}.katex .amsrm,.katex .mathbb,.katex .textbb{font-family:KaTeX_AMS}.katex .mathcal{font-family:KaTeX_Caligraphic}.katex .mathfrak,.katex .textfrak{font-family:KaTeX_Fraktur}.katex .mathboldfrak,.katex .textboldfrak{font-family:KaTeX_Fraktur;font-weight:700}.katex .mathtt{font-family:KaTeX_Typewriter}.katex .mathscr,.katex .textscr{font-family:KaTeX_Script}.katex .mathsf,.katex .textsf{font-family:KaTeX_SansSerif}.katex .mathboldsf,.katex .textboldsf{font-family:KaTeX_SansSerif;font-weight:700}.katex .mathitsf,.katex .mathsfit,.katex .textitsf{font-family:KaTeX_SansSerif;font-style:italic}.katex .mainrm{font-family:KaTeX_Main;font-style:normal}.katex .vlist-t{border-collapse:collapse;display:inline-table;table-layout:fixed}.katex .vlist-r{display:table-row}.katex .vlist{display:table-cell;position:relative;vertical-align:bottom}.katex .vlist>span{display:block;height:0;position:relative}.katex .vlist>span>span{display:inline-block}.katex .vlist>span>.pstrut{overflow:hidden;width:0}.katex .vlist-t2{margin-right:-2px}.katex .vlist-s{display:table-cell;font-size:1px;min-width:2px;vertical-align:bottom;width:2px}.katex .vbox{align-items:baseline;display:inline-flex;flex-direction:column}.katex .hbox{width:100%}.katex .hbox,.katex .thinbox{display:inline-flex;flex-direction:row}.katex .thinbox{max-width:0;width:0}.katex .msupsub{text-align:left}.katex .mfrac>span>span{text-align:center}.katex .mfrac .frac-line{border-bottom-style:solid;display:inline-block;width:100%}.katex .hdashline,.katex .hline,.katex .mfrac .frac-line,.katex .overline .overline-line,.katex .rule,.katex .underline .underline-line{min-height:1px}.katex .mspace{display:inline-block}.katex .smash{display:inline;line-height:0}.katex .clap,.katex .llap,.katex .rlap{position:relative;width:0}.katex .clap>.inner,.katex .llap>.inner,.katex .rlap>.inner{position:absolute}.katex .clap>.fix,.katex .llap>.fix,.katex .rlap>.fix{display:inline-block}.katex .llap>.inner{right:0}.katex .clap>.inner,.katex .rlap>.inner{left:0}.katex .clap>.inner>span{margin-left:-50%;margin-right:50%}.katex .rule{border:0 solid;display:inline-block;position:relative}.katex .hline,.katex .overline .overline-line,.katex .underline .underline-line{border-bottom-style:solid;display:inline-block;width:100%}.katex .hdashline{border-bottom-style:dashed;display:inline-block;width:100%}.katex .sqrt>.root{margin-left:.2777777778em;margin-right:-.5555555556em}.katex .fontsize-ensurer.reset-size1.size1,.katex .sizing.reset-size1.size1{font-size:1em}.katex .fontsize-ensurer.reset-size1.size2,.katex .sizing.reset-size1.size2{font-size:1.2em}.katex .fontsize-ensurer.reset-size1.size3,.katex .sizing.reset-size1.size3{font-size:1.4em}.katex .fontsize-ensurer.reset-size1.size4,.katex .sizing.reset-size1.size4{font-size:1.6em}.katex .fontsize-ensurer.reset-size1.size5,.katex .sizing.reset-size1.size5{font-size:1.8em}.katex .fontsize-ensurer.reset-size1.size6,.katex .sizing.reset-size1.size6{font-size:2em}.katex .fontsize-ensurer.reset-size1.size7,.katex .sizing.reset-size1.size7{font-size:2.4em}.katex .fontsize-ensurer.reset-size1.size8,.katex .sizing.reset-size1.size8{font-size:2.88em}.katex .fontsize-ensurer.reset-size1.size9,.katex .sizing.reset-size1.size9{font-size:3.456em}.katex .fontsize-ensurer.reset-size1.size10,.katex .sizing.reset-size1.size10{font-size:4.148em}.katex .fontsize-ensurer.reset-size1.size11,.katex .sizing.reset-size1.size11{font-size:4.976em}.katex .fontsize-ensurer.reset-size2.size1,.katex .sizing.reset-size2.size1{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size2.size2,.katex .sizing.reset-size2.size2{font-size:1em}.katex .fontsize-ensurer.reset-size2.size3,.katex .sizing.reset-size2.size3{font-size:1.1666666667em}.katex .fontsize-ensurer.reset-size2.size4,.katex .sizing.reset-size2.size4{font-size:1.3333333333em}.katex .fontsize-ensurer.reset-size2.size5,.katex .sizing.reset-size2.size5{font-size:1.5em}.katex .fontsize-ensurer.reset-size2.size6,.katex .sizing.reset-size2.size6{font-size:1.6666666667em}.katex .fontsize-ensurer.reset-size2.size7,.katex .sizing.reset-size2.size7{font-size:2em}.katex .fontsize-ensurer.reset-size2.size8,.katex .sizing.reset-size2.size8{font-size:2.4em}.katex .fontsize-ensurer.reset-size2.size9,.katex .sizing.reset-size2.size9{font-size:2.88em}.katex .fontsize-ensurer.reset-size2.size10,.katex .sizing.reset-size2.size10{font-size:3.4566666667em}.katex .fontsize-ensurer.reset-size2.size11,.katex .sizing.reset-size2.size11{font-size:4.1466666667em}.katex .fontsize-ensurer.reset-size3.size1,.katex .sizing.reset-size3.size1{font-size:.7142857143em}.katex .fontsize-ensurer.reset-size3.size2,.katex .sizing.reset-size3.size2{font-size:.8571428571em}.katex .fontsize-ensurer.reset-size3.size3,.katex .sizing.reset-size3.size3{font-size:1em}.katex .fontsize-ensurer.reset-size3.size4,.katex .sizing.reset-size3.size4{font-size:1.1428571429em}.katex .fontsize-ensurer.reset-size3.size5,.katex .sizing.reset-size3.size5{font-size:1.2857142857em}.katex .fontsize-ensurer.reset-size3.size6,.katex .sizing.reset-size3.size6{font-size:1.4285714286em}.katex .fontsize-ensurer.reset-size3.size7,.katex .sizing.reset-size3.size7{font-size:1.7142857143em}.katex .fontsize-ensurer.reset-size3.size8,.katex .sizing.reset-size3.size8{font-size:2.0571428571em}.katex .fontsize-ensurer.reset-size3.size9,.katex .sizing.reset-size3.size9{font-size:2.4685714286em}.katex .fontsize-ensurer.reset-size3.size10,.katex .sizing.reset-size3.size10{font-size:2.9628571429em}.katex .fontsize-ensurer.reset-size3.size11,.katex .sizing.reset-size3.size11{font-size:3.5542857143em}.katex .fontsize-ensurer.reset-size4.size1,.katex .sizing.reset-size4.size1{font-size:.625em}.katex .fontsize-ensurer.reset-size4.size2,.katex .sizing.reset-size4.size2{font-size:.75em}.katex .fontsize-ensurer.reset-size4.size3,.katex .sizing.reset-size4.size3{font-size:.875em}.katex .fontsize-ensurer.reset-size4.size4,.katex .sizing.reset-size4.size4{font-size:1em}.katex .fontsize-ensurer.reset-size4.size5,.katex .sizing.reset-size4.size5{font-size:1.125em}.katex .fontsize-ensurer.reset-size4.size6,.katex .sizing.reset-size4.size6{font-size:1.25em}.katex .fontsize-ensurer.reset-size4.size7,.katex .sizing.reset-size4.size7{font-size:1.5em}.katex .fontsize-ensurer.reset-size4.size8,.katex .sizing.reset-size4.size8{font-size:1.8em}.katex .fontsize-ensurer.reset-size4.size9,.katex .sizing.reset-size4.size9{font-size:2.16em}.katex .fontsize-ensurer.reset-size4.size10,.katex .sizing.reset-size4.size10{font-size:2.5925em}.katex .fontsize-ensurer.reset-size4.size11,.katex .sizing.reset-size4.size11{font-size:3.11em}.katex .fontsize-ensurer.reset-size5.size1,.katex .sizing.reset-size5.size1{font-size:.5555555556em}.katex .fontsize-ensurer.reset-size5.size2,.katex .sizing.reset-size5.size2{font-size:.6666666667em}.katex .fontsize-ensurer.reset-size5.size3,.katex .sizing.reset-size5.size3{font-size:.7777777778em}.katex .fontsize-ensurer.reset-size5.size4,.katex .sizing.reset-size5.size4{font-size:.8888888889em}.katex .fontsize-ensurer.reset-size5.size5,.katex .sizing.reset-size5.size5{font-size:1em}.katex .fontsize-ensurer.reset-size5.size6,.katex .sizing.reset-size5.size6{font-size:1.1111111111em}.katex .fontsize-ensurer.reset-size5.size7,.katex .sizing.reset-size5.size7{font-size:1.3333333333em}.katex .fontsize-ensurer.reset-size5.size8,.katex .sizing.reset-size5.size8{font-size:1.6em}.katex .fontsize-ensurer.reset-size5.size9,.katex .sizing.reset-size5.size9{font-size:1.92em}.katex .fontsize-ensurer.reset-size5.size10,.katex .sizing.reset-size5.size10{font-size:2.3044444444em}.katex .fontsize-ensurer.reset-size5.size11,.katex .sizing.reset-size5.size11{font-size:2.7644444444em}.katex .fontsize-ensurer.reset-size6.size1,.katex .sizing.reset-size6.size1{font-size:.5em}.katex .fontsize-ensurer.reset-size6.size2,.katex .sizing.reset-size6.size2{font-size:.6em}.katex .fontsize-ensurer.reset-size6.size3,.katex .sizing.reset-size6.size3{font-size:.7em}.katex .fontsize-ensurer.reset-size6.size4,.katex .sizing.reset-size6.size4{font-size:.8em}.katex .fontsize-ensurer.reset-size6.size5,.katex .sizing.reset-size6.size5{font-size:.9em}.katex .fontsize-ensurer.reset-size6.size6,.katex .sizing.reset-size6.size6{font-size:1em}.katex .fontsize-ensurer.reset-size6.size7,.katex .sizing.reset-size6.size7{font-size:1.2em}.katex .fontsize-ensurer.reset-size6.size8,.katex .sizing.reset-size6.size8{font-size:1.44em}.katex .fontsize-ensurer.reset-size6.size9,.katex .sizing.reset-size6.size9{font-size:1.728em}.katex .fontsize-ensurer.reset-size6.size10,.katex .sizing.reset-size6.size10{font-size:2.074em}.katex .fontsize-ensurer.reset-size6.size11,.katex .sizing.reset-size6.size11{font-size:2.488em}.katex .fontsize-ensurer.reset-size7.size1,.katex .sizing.reset-size7.size1{font-size:.4166666667em}.katex .fontsize-ensurer.reset-size7.size2,.katex .sizing.reset-size7.size2{font-size:.5em}.katex .fontsize-ensurer.reset-size7.size3,.katex .sizing.reset-size7.size3{font-size:.5833333333em}.katex .fontsize-ensurer.reset-size7.size4,.katex .sizing.reset-size7.size4{font-size:.6666666667em}.katex .fontsize-ensurer.reset-size7.size5,.katex .sizing.reset-size7.size5{font-size:.75em}.katex .fontsize-ensurer.reset-size7.size6,.katex .sizing.reset-size7.size6{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size7.size7,.katex .sizing.reset-size7.size7{font-size:1em}.katex .fontsize-ensurer.reset-size7.size8,.katex .sizing.reset-size7.size8{font-size:1.2em}.katex .fontsize-ensurer.reset-size7.size9,.katex .sizing.reset-size7.size9{font-size:1.44em}.katex .fontsize-ensurer.reset-size7.size10,.katex .sizing.reset-size7.size10{font-size:1.7283333333em}.katex .fontsize-ensurer.reset-size7.size11,.katex .sizing.reset-size7.size11{font-size:2.0733333333em}.katex .fontsize-ensurer.reset-size8.size1,.katex .sizing.reset-size8.size1{font-size:.3472222222em}.katex .fontsize-ensurer.reset-size8.size2,.katex .sizing.reset-size8.size2{font-size:.4166666667em}.katex .fontsize-ensurer.reset-size8.size3,.katex .sizing.reset-size8.size3{font-size:.4861111111em}.katex .fontsize-ensurer.reset-size8.size4,.katex .sizing.reset-size8.size4{font-size:.5555555556em}.katex .fontsize-ensurer.reset-size8.size5,.katex .sizing.reset-size8.size5{font-size:.625em}.katex .fontsize-ensurer.reset-size8.size6,.katex .sizing.reset-size8.size6{font-size:.6944444444em}.katex .fontsize-ensurer.reset-size8.size7,.katex .sizing.reset-size8.size7{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size8.size8,.katex .sizing.reset-size8.size8{font-size:1em}.katex .fontsize-ensurer.reset-size8.size9,.katex .sizing.reset-size8.size9{font-size:1.2em}.katex .fontsize-ensurer.reset-size8.size10,.katex .sizing.reset-size8.size10{font-size:1.4402777778em}.katex .fontsize-ensurer.reset-size8.size11,.katex .sizing.reset-size8.size11{font-size:1.7277777778em}.katex .fontsize-ensurer.reset-size9.size1,.katex .sizing.reset-size9.size1{font-size:.2893518519em}.katex .fontsize-ensurer.reset-size9.size2,.katex .sizing.reset-size9.size2{font-size:.3472222222em}.katex .fontsize-ensurer.reset-size9.size3,.katex .sizing.reset-size9.size3{font-size:.4050925926em}.katex .fontsize-ensurer.reset-size9.size4,.katex .sizing.reset-size9.size4{font-size:.462962963em}.katex .fontsize-ensurer.reset-size9.size5,.katex .sizing.reset-size9.size5{font-size:.5208333333em}.katex .fontsize-ensurer.reset-size9.size6,.katex .sizing.reset-size9.size6{font-size:.5787037037em}.katex .fontsize-ensurer.reset-size9.size7,.katex .sizing.reset-size9.size7{font-size:.6944444444em}.katex .fontsize-ensurer.reset-size9.size8,.katex .sizing.reset-size9.size8{font-size:.8333333333em}.katex .fontsize-ensurer.reset-size9.size9,.katex .sizing.reset-size9.size9{font-size:1em}.katex .fontsize-ensurer.reset-size9.size10,.katex .sizing.reset-size9.size10{font-size:1.2002314815em}.katex .fontsize-ensurer.reset-size9.size11,.katex .sizing.reset-size9.size11{font-size:1.4398148148em}.katex .fontsize-ensurer.reset-size10.size1,.katex .sizing.reset-size10.size1{font-size:.2410800386em}.katex .fontsize-ensurer.reset-size10.size2,.katex .sizing.reset-size10.size2{font-size:.2892960463em}.katex .fontsize-ensurer.reset-size10.size3,.katex .sizing.reset-size10.size3{font-size:.337512054em}.katex .fontsize-ensurer.reset-size10.size4,.katex .sizing.reset-size10.size4{font-size:.3857280617em}.katex .fontsize-ensurer.reset-size10.size5,.katex .sizing.reset-size10.size5{font-size:.4339440694em}.katex .fontsize-ensurer.reset-size10.size6,.katex .sizing.reset-size10.size6{font-size:.4821600771em}.katex .fontsize-ensurer.reset-size10.size7,.katex .sizing.reset-size10.size7{font-size:.5785920926em}.katex .fontsize-ensurer.reset-size10.size8,.katex .sizing.reset-size10.size8{font-size:.6943105111em}.katex .fontsize-ensurer.reset-size10.size9,.katex .sizing.reset-size10.size9{font-size:.8331726133em}.katex .fontsize-ensurer.reset-size10.size10,.katex .sizing.reset-size10.size10{font-size:1em}.katex .fontsize-ensurer.reset-size10.size11,.katex .sizing.reset-size10.size11{font-size:1.1996142719em}.katex .fontsize-ensurer.reset-size11.size1,.katex .sizing.reset-size11.size1{font-size:.2009646302em}.katex .fontsize-ensurer.reset-size11.size2,.katex .sizing.reset-size11.size2{font-size:.2411575563em}.katex .fontsize-ensurer.reset-size11.size3,.katex .sizing.reset-size11.size3{font-size:.2813504823em}.katex .fontsize-ensurer.reset-size11.size4,.katex .sizing.reset-size11.size4{font-size:.3215434084em}.katex .fontsize-ensurer.reset-size11.size5,.katex .sizing.reset-size11.size5{font-size:.3617363344em}.katex .fontsize-ensurer.reset-size11.size6,.katex .sizing.reset-size11.size6{font-size:.4019292605em}.katex .fontsize-ensurer.reset-size11.size7,.katex .sizing.reset-size11.size7{font-size:.4823151125em}.katex .fontsize-ensurer.reset-size11.size8,.katex .sizing.reset-size11.size8{font-size:.578778135em}.katex .fontsize-ensurer.reset-size11.size9,.katex .sizing.reset-size11.size9{font-size:.6945337621em}.katex .fontsize-ensurer.reset-size11.size10,.katex .sizing.reset-size11.size10{font-size:.8336012862em}.katex .fontsize-ensurer.reset-size11.size11,.katex .sizing.reset-size11.size11{font-size:1em}.katex .delimsizing.size1{font-family:KaTeX_Size1}.katex .delimsizing.size2{font-family:KaTeX_Size2}.katex .delimsizing.size3{font-family:KaTeX_Size3}.katex .delimsizing.size4{font-family:KaTeX_Size4}.katex .delimsizing.mult .delim-size1>span{font-family:KaTeX_Size1}.katex .delimsizing.mult .delim-size4>span{font-family:KaTeX_Size4}.katex .nulldelimiter{display:inline-block;width:.12em}.katex .delimcenter,.katex .op-symbol{position:relative}.katex .op-symbol.small-op{font-family:KaTeX_Size1}.katex .op-symbol.large-op{font-family:KaTeX_Size2}.katex .accent>.vlist-t,.katex .op-limits>.vlist-t{text-align:center}.katex .accent .accent-body{position:relative}.katex .accent .accent-body:not(.accent-full){width:0}.katex .overlay{display:block}.katex .mtable .vertical-separator{display:inline-block;min-width:1px}.katex .mtable .arraycolsep{display:inline-block}.katex .mtable .col-align-c>.vlist-t{text-align:center}.katex .mtable .col-align-l>.vlist-t{text-align:left}.katex .mtable .col-align-r>.vlist-t{text-align:right}.katex .svg-align{text-align:left}.katex svg{fill:currentColor;stroke:currentColor;display:block;height:inherit;position:absolute;width:100%}.katex svg path{stroke:none}.katex svg{fill-rule:nonzero;fill-opacity:1;stroke-width:1;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1}.katex img{border-style:none;max-height:none;max-width:none;min-height:0;min-width:0}.katex .stretchy{display:block;overflow:hidden;position:relative;width:100%}.katex .stretchy:after,.katex .stretchy:before{content:""}.katex .hide-tail{overflow:hidden;position:relative;width:100%}.katex .halfarrow-left{left:0;overflow:hidden;position:absolute;width:50.2%}.katex .halfarrow-right{overflow:hidden;position:absolute;right:0;width:50.2%}.katex .brace-left{left:0;overflow:hidden;position:absolute;width:25.1%}.katex .brace-center{left:25%;overflow:hidden;position:absolute;width:50%}.katex .brace-right{overflow:hidden;position:absolute;right:0;width:25.1%}.katex .x-arrow-pad{padding:0 .5em}.katex .cd-arrow-pad{padding:0 .55556em 0 .27778em}.katex .mover,.katex .munder,.katex .x-arrow{text-align:center}.katex .boxpad{padding:0 .3em}.katex .fbox,.katex .fcolorbox{border:.04em solid;box-sizing:border-box}.katex .cancel-pad{padding:0 .2em}.katex .cancel-lap{margin-left:-.2em;margin-right:-.2em}.katex .sout{border-bottom-style:solid;border-bottom-width:.08em}.katex .angl{border-right:.049em solid;border-top:.049em solid;box-sizing:border-box;margin-right:.03889em}.katex .anglpad{padding:0 .03889em}.katex .eqn-num:before{content:"(" counter(katexEqnNo) ")";counter-increment:katexEqnNo}.katex .mml-eqn-num:before{content:"(" counter(mmlEqnNo) ")";counter-increment:mmlEqnNo}.katex .mtr-glue{width:50%}.katex .cd-vert-arrow{display:inline-block;position:relative}.katex .cd-label-left{display:inline-block;position:absolute;right:calc(50% + .3em);text-align:left}.katex .cd-label-right{display:inline-block;left:calc(50% + .3em);position:absolute;text-align:right}.katex-display{display:block;margin:1em 0;text-align:center}.katex-display>.katex{display:block;text-align:center;white-space:nowrap}.katex-display>.katex>.katex-html{display:block;position:relative}.katex-display>.katex>.katex-html>.tag{position:absolute;right:0}.katex-display.leqno>.katex>.katex-html>.tag{left:0;right:auto}.katex-display.fleqn>.katex{padding-left:2em;text-align:left}body{counter-reset:katexEqnNo mmlEqnNo}:root{--bg: oklch(98.5% .005 75);--paper: oklch(100% 0 0);--paper-soft: oklch(96.5% .006 75);--paper-warm: oklch(94% .008 75);--paper-2: oklch(97.5% .006 75);--paper-3: oklch(93.5% .007 75);--paper-edge: oklch(78% .008 70);--rule: oklch(86% .006 75);--ink: oklch(22% .014 55);--ink-deep: oklch(16% .014 55);--ink-soft: oklch(36% .014 55);--ink-muted: oklch(50% .012 55);--ink-faint: oklch(64% .008 75);--ink-warm: oklch(30% .018 55);--cinnabar: oklch(45% .2 28);--cinnabar-soft: oklch(96% .025 28);--celadon: oklch(43% .06 170);--celadon-soft: oklch(95% .018 170);--cs-accent: oklch(44% .08 215);--cs-accent-soft: oklch(96% .015 215);--ochre: oklch(52% .09 75);--font-display: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "STSong", Georgia, serif;--font-body: "PingFang SC", "Source Han Sans SC", "Noto Sans SC", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;--font-mono: "IBM Plex Mono", var(--font-mono)}*{box-sizing:border-box}[hidden]{display:none!important}html{background:var(--bg);color:var(--ink);font-family:var(--font-body);letter-spacing:0}html[data-soft-light=true] body{background:var(--paper-soft)}body{margin:0;min-width:320px;background:var(--bg);font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}a{color:inherit;text-decoration:none}button,input,textarea,select{font:inherit}button{cursor:pointer}.site-shell{min-height:100vh}.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:36px;min-height:64px;padding:6px max(28px,calc((100vw - 1320px)/2 + 28px));border-bottom:1px solid var(--ink);background:var(--paper);color:var(--ink)}.wordmark{display:inline-flex;align-items:center;gap:8px;color:var(--ink-deep);font-family:var(--font-display);font-size:22px;font-weight:600;line-height:1;letter-spacing:.08em}.wordmark img{display:block;height:44px;width:auto}.wordmark i{display:block;width:6px;height:6px;border-radius:999px;background:var(--cinnabar)}.nav{display:flex;align-items:center;gap:26px;color:var(--ink-soft);font:13px/1.2 var(--font-body)}.nav a{padding:6px 0;border-bottom:1px solid transparent}.nav a:hover,.nav a[aria-current=page]{background:transparent;border-bottom-color:var(--cinnabar);color:var(--ink-deep)}.folio{margin-left:auto;color:var(--ink-muted);font:11px/1.2 var(--font-mono);letter-spacing:.22em;text-transform:uppercase;white-space:nowrap}.topbar-auth{margin-left:auto;color:var(--ink-soft);font:13px/1.2 var(--font-body)}.folio span{color:var(--cinnabar)}.page{width:min(1320px,calc(100vw - 56px));margin:0 auto;padding:64px 0 96px}.eyebrow{color:var(--ink-muted);font:11px/1.4 var(--font-mono);letter-spacing:.2em;text-transform:uppercase}.button{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;padding:8px 13px;border:1px solid var(--ink);border-radius:0;background:var(--ink);color:#f0eeeb;font:12px/1.2 var(--font-mono);letter-spacing:.12em;text-transform:uppercase}.button.secondary{border-color:var(--ink);background:transparent;color:var(--ink-soft)}.button.ghost{border-color:transparent;background:transparent;color:var(--ink-muted)}.book-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:0;margin-top:36px;border:1px solid var(--ink)}.book-card,.panel{border:1px solid var(--ink);border-radius:0;background:var(--paper)}.book-card{display:grid;grid-template-rows:auto 1fr auto;min-height:360px;padding:36px 36px 30px;border:0;border-right:1px solid var(--ink);background:var(--paper);transition:background .16s ease}.book-card:last-child{border-right:0}.book-card:hover{background:var(--paper-soft)}.book-card h2{margin:8px 0;font-family:var(--font-display);font-size:38px;font-weight:600;letter-spacing:0;line-height:1.1;color:var(--ink-deep)}.book-card p{margin:0;color:var(--ink-soft);font-size:15px;line-height:1.9}.unit-list{display:grid;gap:8px;margin-top:18px}.unit-link{display:grid;grid-template-columns:64px 1fr;gap:12px;min-height:54px;padding:12px 0;border:0;border-bottom:1px dashed var(--paper-edge);border-radius:0;background:transparent}.unit-link:hover{border-color:var(--ink);background:transparent}.unit-no{color:var(--cinnabar);font:11px/1.2 var(--font-mono);letter-spacing:.12em}.unit-title{color:var(--ink);font-family:var(--font-display);font-size:15px;line-height:1.35}.unit-excerpt{margin-top:4px;color:var(--ink-muted);font:12px/1.55 var(--font-body)}.reader-toolbar{display:flex;align-items:baseline;gap:22px;margin-bottom:36px;padding-bottom:18px;border-bottom:1px solid var(--ink)}.reader-toolbar h1{margin:4px 0 0;color:var(--ink-deep);font-family:var(--font-display);font-size:42px;font-weight:500;line-height:1.14;letter-spacing:0}.reader-nav{display:flex;flex-wrap:wrap;gap:8px;justify-content:flex-end;margin-left:auto}.reader-nav-bottom{justify-content:flex-end;margin:48px 0 24px;padding-top:18px;border-top:1px solid var(--ink)}.reader-toc-backdrop{position:fixed;inset:0;z-index:55;border:0;padding:0;background:#2019142e;cursor:default}.reader-toc{position:fixed;top:0;bottom:0;left:0;z-index:60;display:grid;grid-template-rows:auto minmax(0,1fr);width:min(380px,92vw);border-right:1px solid var(--ink);background:var(--paper);box-shadow:1px 0 0 var(--paper-edge)}.reader-toc[hidden]{display:none}.reader-toc-head{display:flex;align-items:flex-start;gap:12px;padding:22px 22px 18px;border-bottom:1px solid var(--ink);background:var(--ink-warm);color:#f0eeeb}.reader-toc-title{display:grid;gap:4px;min-width:0;flex:1;color:inherit;text-decoration:none}.reader-toc-title span{color:#a8a49f;font:10.5px/1.4 var(--font-mono);letter-spacing:.16em;text-transform:uppercase}.reader-toc-title strong{font-family:var(--font-display);font-size:22px;font-weight:500;line-height:1.25}.reader-toc-title em{color:#bab7b2;font:12px/1.4 var(--font-body);font-style:normal}.reader-toc-title:hover strong,.reader-toc-title:focus-visible strong{text-decoration:underline;text-underline-offset:4px}.reader-toc-body{overflow-y:auto;padding:8px 14px 24px}.reader-toc-section+.reader-toc-section{margin-top:18px}.reader-toc-section-head{display:flex;align-items:baseline;gap:10px;padding:12px 8px 8px;border-bottom:1px solid var(--paper-edge)}.reader-toc-section-head h2{margin:0;flex:1;min-width:0;font-family:var(--font-display);font-size:15px;font-weight:500;line-height:1.3;color:var(--ink-deep)}.reader-toc-range{color:var(--cinnabar);font:11px/1.2 var(--font-mono);letter-spacing:.18em;text-transform:uppercase}.reader-toc-count{color:var(--ink-muted);font:11px/1.2 var(--font-mono);letter-spacing:.12em}.reader-toc-units{display:grid;gap:2px;margin:6px 0 0;padding:0;list-style:none}.reader-toc-unit{display:grid;grid-template-columns:36px minmax(0,1fr);gap:4px 10px;align-items:baseline;padding:8px 10px;border:1px solid transparent;color:inherit;text-decoration:none}.reader-toc-unit:hover{border-color:var(--paper-edge);background:var(--paper-soft)}.reader-toc-unit.is-current{border-color:var(--cinnabar);background:var(--paper-soft)}.reader-toc-num{color:var(--ink-muted);font:12px/1.2 var(--font-mono);letter-spacing:.08em}.reader-toc-unit.is-current .reader-toc-num{color:var(--cinnabar)}.reader-toc-text{display:grid;gap:2px;min-width:0}.reader-toc-text strong{color:var(--ink-deep);font-size:14px;font-weight:500;line-height:1.4}.reader-toc-text em{overflow:hidden;color:var(--ink-muted);font:12px/1.45 var(--font-body);font-style:normal;text-overflow:ellipsis;white-space:nowrap}.reader-layout{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(360px,1fr);gap:80px;align-items:start}.text-panel,.side-panel{min-height:calc(100vh - 144px)}.text-panel{padding:0;border:0;background:transparent}.side-panel{display:grid;gap:28px}.section-label{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:24px;padding:10px 0;border-top:1px solid var(--ink-soft);border-bottom:1px solid var(--ink-soft);color:var(--cinnabar);font:11px/1.2 var(--font-mono);letter-spacing:.24em;text-transform:uppercase}.classical-text{color:var(--ink-deep);font-family:var(--font-display);font-size:22px;line-height:2.05;letter-spacing:.012em}html[data-read-size=small] .classical-text{font-size:17px;line-height:2.05}html[data-read-size=small] .source-text-block .classical-text,html[data-read-size=small] .annotation-item p{font-size:13px}html[data-read-size=middle] .classical-text{font-size:clamp(18px,1.4vw,22px);line-height:2.15}html[data-read-size=middle] .source-text-block .classical-text,html[data-read-size=middle] .annotation-item p{font-size:14px}html[data-read-size=large] .classical-text{font-size:24px;line-height:2.28}html[data-read-size=large] .source-text-block .classical-text,html[data-read-size=large] .annotation-item p{font-size:16px}html[data-read-size=small] .note-box textarea{font-size:13px}html[data-read-size=large] .note-box textarea{font-size:16px}.classical-text p{margin:0 0 1em;text-indent:2em}.classical-text .classical-heading{margin:1.35em 0 .55em;color:var(--cinnabar);font-family:var(--font-body);font-size:.82em;font-weight:600;line-height:1.45;letter-spacing:.18em;text-indent:0}.classical-text .classical-heading:first-child{margin-top:0}.classical-text::highlight(dengxia-source-selection){background:#9d3f2f3d;color:inherit}.content-blocks{display:grid;gap:20px}.content-block{scroll-margin-top:84px}.geometry-block,.proposition-statement,.proof-block,.figure-placeholder,.figure-block,.exercise-block,.scene3d-block,.math-block,.cs-block,.extras-block,.vernacular-note-block,.source-text-block{border:1px solid var(--ink);background:var(--paper)}.geometry-block{display:grid;grid-template-columns:96px minmax(0,1fr);gap:18px;align-items:baseline;padding:18px 20px}.geometry-label{color:var(--cinnabar);font:12px/1.4 var(--font-mono);letter-spacing:.1em;white-space:nowrap}.geometry-block p{margin:0;color:var(--ink-deep);font-size:17px;line-height:1.9}.bilingual-line{margin:0}.bilingual-line.line-en{color:var(--ink-muted);font-family:var(--font-body);font-style:italic;font-size:.9em;line-height:1.6;letter-spacing:.005em}.bilingual-line.line-zh{color:var(--ink-deep)}.bilingual-line.line-en+.bilingual-line.line-zh,.bilingual-line.line-zh+.bilingual-line.line-en{margin-top:2px}.classical-text .bilingual-line.line-en,.source-text-block .bilingual-line.line-en{font-size:13.5px}.classical-text .line-vernacular{margin-top:-.45em;color:var(--ink-soft);font-family:var(--font-body);font-size:.74em;line-height:1.72;letter-spacing:0;text-indent:0}.classical-text .line-classical+.line-vernacular,.classical-text .line-zh:not(.line-vernacular)+.line-vernacular{margin-bottom:.85em}.source-text-block .classical-text .line-vernacular{margin-top:-.2em;font-size:.95em;line-height:1.75}.exercise-prompt-body{display:grid;gap:6px;margin:0}.exercise-prompt-body p{margin:0;color:var(--ink-deep);font-size:16px;line-height:1.8}.exercise-prompt-body .bilingual-line.line-zh{font-size:16px}.exercise-prompt-body .bilingual-line.line-en{color:var(--ink-muted);font-size:13.5px}.figcaption-body{display:grid;gap:2px}.figcaption-body p{margin:0}.figcaption-body .bilingual-line.line-en{font-size:12px}.geometry-body{display:grid;gap:4px}.geometry-body .bilingual-line{margin:0}.geometry-body .line-zh{color:var(--ink-deep);font-family:var(--font-display);font-size:17px;line-height:1.85}.geometry-body .line-en{color:var(--ink-muted);font-family:var(--font-body);font-size:14px;font-style:italic;line-height:1.55;letter-spacing:.005em}.proposition-statement{padding:22px 24px}.proposition-body{display:grid;gap:6px}.proposition-body .bilingual-line{margin:0}.proposition-body .line-zh{color:var(--ink-deep);font-family:var(--font-display);font-size:22px;line-height:1.7}.proposition-body .line-en{color:var(--ink-muted);font-family:var(--font-body);font-size:15px;font-style:italic;line-height:1.55;letter-spacing:.005em}.proposition-body .line-zh+.line-en,.proposition-body .line-en+.line-zh{margin-top:2px}.source-text-block{padding:22px 24px;background:var(--paper-soft)}.content-block[data-source-kind]{position:relative}.content-block[data-source-kind=preserved]{border-left:4px solid #2f6f73}.content-block[data-source-kind=simplified]{border-left:4px dashed #92723a;background:repeating-linear-gradient(135deg,rgba(146,114,58,.05),rgba(146,114,58,.05) 6px,transparent 6px,transparent 14px),var(--paper-soft)}.content-block[data-source-kind=expanded]{border-left:4px solid #6b5aa6;box-shadow:inset 0 0 0 1px #6b5aa629}.content-block[data-source-kind=lamplight-original]{border-left:4px solid var(--cinnabar);background:linear-gradient(180deg,#9d3f2f14,#9d3f2f00),var(--paper)}.vernacular-note-block{display:grid;gap:14px;padding:22px 24px;background:linear-gradient(180deg,#9d3f2f0f,#9d3f2f00),var(--paper-soft)}.vernacular-note-body{display:grid;gap:10px}.vernacular-note-body p{margin:0;color:var(--ink-deep);font-size:15.5px;line-height:1.9}.vernacular-note-body p:first-child{font-size:16.5px}.inline-figure{display:block;max-width:560px;margin:16px 0 6px}.inline-figure-image{display:block;width:100%;height:auto;border:1px solid var(--paper-edge);background:var(--paper-warm);cursor:zoom-in}.inline-figure-caption{display:block;margin-top:7px;color:var(--ink-muted);font:12px/1.55 var(--font-body)}.source-text-block .classical-text{margin-top:14px;color:var(--ink-soft);font:14px/1.85 var(--font-body)}.source-text-block .classical-text p{text-indent:0}.proof-block{padding:0}.proof-block summary{display:flex;align-items:center;justify-content:space-between;min-height:50px;padding:14px 18px;border-bottom:1px solid transparent;color:var(--cinnabar);cursor:pointer;font:12px/1.4 var(--font-mono);letter-spacing:.12em;text-transform:uppercase;list-style:none}.proof-block summary::-webkit-details-marker{display:none}.proof-block summary:after{content:"+";color:var(--ink-muted);font-size:18px;line-height:1}.proof-block[open] summary{border-bottom-color:var(--ink)}.proof-block[open] summary:after{content:"-"}.proof-body{display:grid;gap:14px;padding:18px 22px 22px}.proof-body .bilingual-line,.proof-body p{margin:0}.proof-body .line-zh,.proof-line.line-zh,.proof-step-line.line-zh{color:var(--ink-deep);font-size:15px;line-height:1.9}.proof-body .line-en,.proof-line.line-en,.proof-step-line.line-en{color:var(--ink-muted);font-family:var(--font-body);font-size:13.5px;font-style:italic;line-height:1.65;letter-spacing:.005em}.proof-step-block{display:grid;outline:none}.proof-step-block:focus-visible{box-shadow:0 0 0 2px var(--cinnabar-soft) inset}.proof-step-head{display:grid;grid-template-columns:minmax(0,auto) 1fr auto;align-items:center;gap:14px;padding:14px 18px;border-bottom:1px solid var(--paper-edge);background:var(--paper-soft)}.proof-step-title{display:inline-flex;align-items:baseline;gap:8px;color:var(--cinnabar);font:12px/1.4 var(--font-mono);letter-spacing:.12em;text-transform:uppercase}.proof-step-title-en{color:var(--ink-muted);letter-spacing:.08em;font-size:11px;text-transform:uppercase}.proof-step-tracker{display:flex;flex-wrap:wrap;align-items:center;gap:6px;justify-self:end}.proof-step-tracker-dot{display:inline-flex;align-items:center;justify-content:center;min-width:26px;height:22px;padding:0 6px;border:1px solid var(--paper-edge);background:var(--paper);color:var(--ink-muted);font:11px/1 var(--font-mono);letter-spacing:.08em;cursor:pointer;transition:background-color .12s ease,border-color .12s ease,color .12s ease}.proof-step-tracker-dot:hover{border-color:var(--cinnabar);color:var(--cinnabar)}.proof-step-tracker-dot[data-step-state=done]{border-color:var(--ink-soft);color:var(--ink-soft)}.proof-step-tracker-dot[data-step-state=current]{border-color:var(--cinnabar);background:var(--cinnabar);color:var(--paper)}.proof-step-counter{color:var(--ink-muted);font:11px/1 var(--font-mono);letter-spacing:.08em}.proof-step-list{margin:0;padding:4px 0;list-style:none}.proof-step{position:relative;display:grid;grid-template-columns:56px minmax(0,1fr);gap:14px;padding:14px 22px;transition:opacity .16s ease,filter .16s ease}.proof-step+.proof-step{border-top:1px dashed var(--paper-edge)}.proof-step-marker{display:flex;justify-content:center;padding-top:2px;color:var(--ink-muted);font:12px/1 var(--font-mono);letter-spacing:.12em}.proof-step-marker-num{display:inline-flex;align-items:center;justify-content:center;min-width:30px;height:30px;border:1px solid var(--paper-edge);border-radius:999px;color:var(--ink-muted);background:var(--paper)}.proof-step[data-step-state=current] .proof-step-marker-num{border-color:var(--cinnabar);background:var(--cinnabar);color:var(--paper)}.proof-step[data-step-state=done] .proof-step-marker-num{border-color:var(--ink-soft);color:var(--ink-soft)}.proof-step[data-step-state=pending]{opacity:.32}.proof-step[data-step-state=pending] .proof-step-content{filter:blur(2px);-webkit-user-select:none;-moz-user-select:none;user-select:none}.proof-step[data-step-state=current]:before{content:"";position:absolute;left:0;top:10px;bottom:10px;width:3px;background:var(--cinnabar)}.proof-step-content{display:grid;gap:6px}.proof-step-actions{display:flex;flex-wrap:wrap;align-items:center;gap:12px;padding:14px 18px;border-top:1px solid var(--paper-edge);background:var(--paper-soft)}.proof-step-actions-main{display:inline-flex;gap:8px}.proof-step-actions .button{display:inline-flex;align-items:center;gap:6px}.proof-step-actions .button.ghost{margin-left:auto;background:transparent;border-color:var(--paper-edge);color:var(--ink-soft)}.proof-step-actions .button.ghost:hover{border-color:var(--cinnabar);color:var(--cinnabar)}.proof-step-help{color:var(--ink-muted);font:11px/1 var(--font-mono);letter-spacing:.08em;flex-basis:100%;text-align:right}.license-badge{display:inline-flex;flex-wrap:wrap;align-items:center;gap:8px;margin:0 0 18px;padding:8px 10px;border:1px solid var(--paper-edge);border-left:3px solid var(--cs-accent);background:var(--paper);color:var(--ink-soft);font:12px/1.35 var(--font-mono)}.license-badge strong{color:var(--cs-accent);font-weight:700}.math-block,.cs-block,.extras-block{display:grid;gap:14px;padding:20px 22px}.math-block{background:var(--paper-soft)}.cs-block{border-left:4px solid var(--cs-accent);background:var(--paper-soft)}.cs-block .section-label{color:var(--cs-accent);border-color:var(--paper-edge)}.code-block{margin:0}.code-block-toolbar{display:flex;align-items:center;justify-content:space-between;gap:8px 12px;flex-wrap:wrap}.code-block-toolbar span{color:var(--ink-muted);font:11px/1.4 var(--font-mono);letter-spacing:.08em;text-transform:uppercase}.code-copy-button{min-height:32px;padding:6px 10px;font-size:12px}.code-copy-button[disabled]{opacity:.7;cursor:default}.code-block-pre{margin:0;padding:14px 16px;border:1px solid var(--paper-edge);background:var(--paper);color:var(--ink-deep);font:13.5px/1.7 var(--font-mono);overflow-x:auto;-moz-tab-size:2;-o-tab-size:2;tab-size:2}.code-block-pre code,.code-output code,.trace-expression code,.trace-step-body code{font:inherit}.code-output{display:grid;gap:8px;margin:0;padding-top:12px;border-top:1px solid var(--paper-edge)}.code-output span,.trace-expression span{color:var(--ink-muted);font:11px/1.2 var(--font-mono);letter-spacing:.12em;text-transform:uppercase}.code-output pre{margin:0;padding:10px 12px;border:1px solid var(--paper-edge);background:var(--cs-accent-soft);color:var(--ink-deep);font:13px/1.55 var(--font-mono);overflow-x:auto}.trace-expression{display:grid;gap:8px}.trace-expression code{display:block;padding:12px 14px;border:1px solid var(--paper-edge);background:var(--paper);color:var(--ink-deep);font:13.5px/1.65 var(--font-mono);overflow-x:auto}.trace-step-list{display:grid;gap:0;margin:0;padding:0;list-style:none;border-top:1px solid var(--paper-edge)}.trace-step{display:grid;grid-template-columns:42px minmax(0,1fr);gap:12px;padding:13px 0;border-bottom:1px solid var(--paper-edge)}.trace-step-index{color:var(--cs-accent);font:12px/1.5 var(--font-mono);letter-spacing:.08em}.trace-step-body{display:grid;gap:6px}.trace-step-body code{color:var(--ink-deep);font:13.5px/1.65 var(--font-mono);overflow-wrap:anywhere}.trace-step-body p{margin:0;color:var(--ink-muted);font-size:13.5px;line-height:1.65}.extras-block{background:linear-gradient(180deg,#285c7812,#285c7800),var(--paper)}.competition-problem-block{border-color:var(--extras-cold, var(--ink));background:linear-gradient(180deg,#2060911a,#20609105),var(--paper)}.competition-problem-block .math-block-body p,.competition-problem-block .math-block-body .math-line{font-family:var(--font-mono);font-size:14px;line-height:1.85}.math-block-body{display:grid;gap:8px}.math-block-body p,.math-block-body .math-line{margin:0;color:var(--ink-deep);font-size:15.5px;line-height:1.9}.math-block-body .line-en,.math-line.line-en{color:var(--ink-muted);font-family:var(--font-body);font-size:13.5px;font-style:italic;line-height:1.65}.math-expression{padding:12px 14px;border:1px solid var(--paper-edge);background:var(--paper);color:var(--ink-deep);font:15px/1.7 var(--font-mono);overflow-x:auto}.math-step-list{display:grid;gap:10px;margin:0;padding-left:24px}.math-step-list li{padding-left:6px}.math-block-subtitle{color:var(--cinnabar);font:12px/1.4 var(--font-mono);letter-spacing:.12em}.table-scroll{overflow-x:auto}.numerical-table-block table{width:100%;border-collapse:collapse;font-size:14px}.numerical-table-block th,.numerical-table-block td{padding:9px 10px;border:1px solid var(--paper-edge);text-align:left;vertical-align:top}.numerical-table-block th{color:var(--cinnabar);background:var(--paper);font-weight:600}.numerical-table-block p{margin:0}.numerical-table-block figcaption{color:var(--ink-muted);font:12px/1.6 var(--font-body)}.problem-meta{display:flex;flex-wrap:wrap;gap:8px}.problem-meta span{display:inline-flex;align-items:center;min-height:24px;padding:2px 8px;border:1px solid var(--paper-edge);background:var(--extras-cold-soft, var(--paper-soft));color:var(--ink-soft);font:12px/1.2 var(--font-mono)}.fold-block{padding:0}.fold-block summary{display:flex;align-items:center;justify-content:space-between;min-height:48px;padding:13px 18px;color:var(--cinnabar);cursor:pointer;font:12px/1.4 var(--font-mono);letter-spacing:.12em;text-transform:uppercase;list-style:none}.fold-block summary::-webkit-details-marker{display:none}.fold-block summary:after{content:"+";color:var(--ink-muted);font-size:18px;line-height:1}.fold-block[open] summary{border-bottom:1px solid var(--paper-edge)}.fold-block[open] summary:after{content:"-"}.fold-block .math-block-body{padding:18px 22px 22px}@media(max-width:720px){.proof-step-head{grid-template-columns:1fr}.proof-step-tracker,.proof-step-counter{justify-self:start}.proof-step{grid-template-columns:40px minmax(0,1fr);padding:14px 16px}.proof-step-actions-main{flex:1 1 auto}.proof-step-actions .button.ghost{margin-left:0}}.figure-ref,.unit-wikilink{display:inline-flex;align-items:center;min-height:24px;padding:1px 6px;border:1px solid var(--paper-edge);background:var(--paper-soft);color:var(--cinnabar);font:inherit;line-height:1.3;vertical-align:baseline}.figure-ref:hover,.figure-ref.is-highlighted,.unit-wikilink:hover{border-color:var(--cinnabar);background:var(--cinnabar-soft)}.figure-block{display:grid;gap:14px;margin:0;padding:18px}.figure-block svg{display:block;width:100%;aspect-ratio:392 / 292;border:1px solid var(--paper-edge);background:var(--paper-warm)}.figure-element{outline:none;cursor:pointer}.figure-element line,.figure-element path{fill:none;stroke:var(--ink-soft);stroke-width:1.6;vector-effect:non-scaling-stroke}.figure-element circle{fill:var(--paper);stroke:var(--ink-soft);stroke-width:1.6;vector-effect:non-scaling-stroke}.figure-point circle{fill:var(--cinnabar);stroke:var(--paper);stroke-width:1.4}.figure-element text{fill:var(--ink-soft);font-family:var(--font-mono);font-size:11px;line-height:1;letter-spacing:0;pointer-events:none;dominant-baseline:middle;paint-order:stroke;stroke:var(--paper-warm);stroke-width:3.5;stroke-linejoin:round}.figure-point text{fill:var(--ink-deep);font-weight:600;font-size:12px}.figure-angle text{fill:var(--cinnabar);font-size:10.5px}.figure-circle text{fill:var(--ink-muted);font-size:10.5px}.figure-element.is-highlighted line,.figure-element.is-highlighted path{stroke:var(--cinnabar);stroke-width:2.6}.figure-element.is-highlighted circle{stroke:var(--cinnabar);stroke-width:2.4}.figure-element.is-highlighted text{fill:var(--cinnabar)}.figure-point.is-highlighted circle{fill:var(--cinnabar);r:4.5}.figure-block figcaption,.figure-index{display:grid;gap:4px;color:var(--ink-soft);font-size:13px;line-height:1.65}.figure-block figcaption strong,.figure-index strong{color:var(--ink);font:12px/1.4 var(--font-mono);letter-spacing:.12em;text-transform:uppercase}.figure-legend,.figure-index div{display:flex;flex-wrap:wrap;gap:6px}.figure-placeholder-index{display:grid;gap:8px}.figure-index-group{display:grid;gap:6px}.figure-index-group>span{color:var(--ink-muted);font:12px/1.4 var(--font-mono)}.figure-index-group>div{display:flex;flex-wrap:wrap;gap:6px}.figure-placeholder{display:grid;gap:10px;margin:0;padding:16px}.figure-placeholder img,.figure-placeholder-box,.figure-placeholder-svg{display:block;width:100%;border:1px solid var(--ink);background:var(--paper-warm)}.figure-placeholder-svg{aspect-ratio:3 / 2}.figure-block .figure-line line,.figure-block .figure-angle path,.figure-block .figure-circle circle,.figure-placeholder-svg .figure-line line,.figure-placeholder-svg .figure-angle path,.figure-placeholder-svg .figure-circle circle{opacity:.42}.figure-placeholder-plane{fill:var(--paper-warm);stroke:none}.figure-placeholder img{max-height:min(60vh,520px);-o-object-fit:contain;object-fit:contain;cursor:zoom-in}.figure-placeholder-box{aspect-ratio:3 / 2;display:grid;place-items:center;color:var(--ink-muted);font:13px/1.4 var(--font-mono);letter-spacing:.12em}.figure-placeholder figcaption{display:grid;gap:4px;color:var(--ink-soft);font-size:13px;line-height:1.65}.figure-placeholder figcaption strong{color:var(--ink);font:12px/1.4 var(--font-mono);letter-spacing:.12em;text-transform:uppercase}.figure-placeholder-note{margin:0;color:var(--ink-muted);font-size:12px;line-height:1.6}.exercise-block{display:grid;gap:14px;padding:18px}.exercise-prompt{margin:0;color:var(--ink-deep);font-size:16px;line-height:1.8}.exercise-hints{padding:12px;border:1px dashed var(--paper-edge);background:var(--paper-soft)}.exercise-hints summary{color:var(--ink-soft);cursor:pointer;font:12px/1.4 var(--font-mono);letter-spacing:.12em;text-transform:uppercase}.exercise-block textarea,.learning-panel textarea{width:100%;min-height:92px;padding:12px;border:1px solid var(--paper-edge);background:var(--paper);color:var(--ink);resize:vertical}.exercise-actions,.learning-actions{display:flex;flex-wrap:wrap;gap:8px}.exercise-feedback,.empty-note{margin:0;color:var(--ink-soft);font-size:13px;line-height:1.7}.vibe-practice-block{display:grid;gap:12px;padding:18px}.vibe-practice-prompt,.vibe-practice-checklist,.vibe-practice-hint,.vibe-practice-escalation{margin:0;color:var(--ink-deep);font-size:15px;line-height:1.8}.vibe-practice-prompt{display:grid;gap:5px}.vibe-practice-checklist{padding-left:20px}.vibe-practice-hint,.vibe-practice-escalation{padding:10px 12px;border:1px solid var(--paper-edge);background:var(--paper-soft);color:var(--ink-soft)}.scene3d-block{display:grid;gap:12px;margin:0;padding:16px}.scene3d-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(220px,.42fr);gap:14px;align-items:stretch}.scene3d-main{display:grid;gap:9px;min-width:0}.scene3d-stage{position:relative;min-height:360px;aspect-ratio:4 / 3;overflow:hidden;border:1px solid var(--paper-edge);background:var(--paper-warm)}.scene3d-canvas-root,.scene3d-poster{position:absolute;inset:0;width:100%;height:100%}.scene3d-canvas-root{z-index:2}.scene3d-canvas-root:not(.is-ready){pointer-events:none}.scene3d-canvas-root canvas{display:block;width:100%;height:100%}.scene3d-poster{z-index:1;-o-object-fit:cover;object-fit:cover;transition:opacity .18s ease}.scene3d-canvas-root.is-ready+.scene3d-poster{opacity:.14}.scene3d-poster-fallback,.scene3d-status{display:grid;place-items:center;padding:18px;color:var(--ink-muted);font:12px/1.6 var(--font-mono);letter-spacing:.1em;text-align:center}.scene3d-status{min-height:100%;background:#fbf8f1e6}.scene3d-caption{display:grid;gap:4px;color:var(--ink-soft);font-size:13px;line-height:1.65}.scene3d-caption strong{color:var(--ink);font:12px/1.4 var(--font-mono);letter-spacing:.12em;text-transform:uppercase}.scene3d-side{display:grid;align-content:start;gap:14px;padding:12px;border:1px solid var(--paper-edge);background:var(--paper-soft)}.scene3d-side section{display:grid;gap:8px}.scene3d-side h3{margin:0;color:var(--ink-muted);font:11px/1.4 var(--font-mono);letter-spacing:.14em;text-transform:uppercase}.scene3d-button-list{display:grid;gap:7px}.scene3d-select{display:grid;gap:3px;width:100%;padding:9px 10px;border:1px solid var(--paper-edge);background:var(--paper);color:var(--ink);text-align:left}.scene3d-select span{color:var(--ink-deep);font-size:14px;line-height:1.35}.scene3d-select small{color:var(--ink-muted);font-size:12px;line-height:1.55}.scene3d-select:hover,.scene3d-select:focus-visible{border-color:var(--ink);background:var(--paper-soft);outline:none}.scene3d-select.is-highlighted,.scene3d-select[aria-pressed=true]{border-color:var(--cinnabar);background:var(--cinnabar-soft);outline:none}.note-links,.backlink-list{display:grid;gap:8px;margin-top:10px}.note-links{grid-template-columns:auto 1fr;align-items:baseline}.note-links span{color:var(--ink-muted);font:11px/1.4 var(--font-mono);letter-spacing:.14em;text-transform:uppercase}.note-links a,.backlink-item{padding:8px 10px;border:1px solid var(--paper-edge);background:var(--paper-soft)}.backlink-item{display:grid;gap:3px}.backlink-item span{color:var(--ink-muted);font-size:12px;line-height:1.5}.learning-panel{padding:18px}.learning-actions .is-active{border-color:var(--cinnabar);color:var(--cinnabar);background:var(--cinnabar-soft)}.note-box{margin-top:56px;padding:28px 0 24px;border-top:1px solid var(--ink);border-bottom:1px solid var(--ink)}.note-box textarea,.composer textarea{width:100%;border:1px solid var(--paper-edge);border-radius:0;background:var(--paper);color:var(--ink);resize:vertical;outline:none}.note-box textarea{min-height:126px;padding:12px 14px;line-height:1.75}.reasoning{padding:22px}.reasoning ul{margin:0;padding-left:18px;color:var(--ink-soft);line-height:1.8}.annotation-panel{padding:22px}.illustration-panel{display:grid;gap:12px;padding:22px}.illustration-stack{display:grid;gap:12px}.illustration-frame{margin:0;display:grid;gap:8px}.illustration-frame img{display:block;width:100%;max-height:min(55vh,480px);-o-object-fit:contain;object-fit:contain;border-radius:0;border:1px solid var(--ink);background:var(--paper-warm);cursor:zoom-in}.illustration-frame figcaption{color:var(--ink-soft);font:13px/1.7 var(--font-body)}.annotation-list{display:grid;gap:12px}.annotation-item{padding-top:18px;border-top:1px dashed var(--paper-edge)}.annotation-item:first-child{padding-top:0;border-top:0}.annotation-item.is-preferred strong{color:var(--cinnabar)}.annotation-meta{display:flex;justify-content:space-between;gap:10px;align-items:flex-start}.annotation-meta a{flex:0 0 auto;color:var(--cinnabar);font:10.5px/1.45 var(--font-mono);letter-spacing:.14em;text-transform:uppercase}.annotation-meta strong{display:block;font-family:var(--font-display);font-size:18px;line-height:1.2}.annotation-meta span{display:block;margin-top:4px;color:var(--ink-muted);font:10.5px/1.45 var(--font-mono);letter-spacing:.14em;text-transform:uppercase}.annotation-item p{margin:8px 0 0;color:var(--ink-soft);font-size:14px;line-height:1.8;white-space:pre-wrap}.annotation-item.is-missing p{color:var(--ink-muted)}.annotation-missing{font-style:italic}.reader-chat{position:relative;z-index:60}.chat-launcher{position:fixed;right:24px;bottom:24px;z-index:70;display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 16px;border:1px solid var(--ink);border-radius:0;background:var(--ink-warm);color:#f0eeeb;font:12px/1 var(--font-mono);letter-spacing:.14em;text-transform:uppercase}.chat-launcher svg{width:18px;height:18px}.reader-chat[data-open=true] .chat-launcher{background:var(--paper);color:var(--ink)}.chat-backdrop{position:fixed;inset:0;z-index:50;border:0;background:#20191429;cursor:default}.chat-panel{position:fixed;right:24px;bottom:88px;z-index:65;display:grid;grid-template-rows:auto minmax(180px,1fr) auto;width:min(420px,calc(100vw - 32px));min-height:min(560px,calc(100vh - 116px));max-height:calc(100vh - 116px);padding:0;overflow:hidden;border:1px solid var(--ink);background:var(--paper-soft)}.chat-drawer-head{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px;align-items:start;margin-bottom:0;padding:18px 22px 14px;border-bottom:1px solid var(--ink);background:var(--ink-warm);color:#f0eeeb}.chat-drawer-head span{display:block;color:#a8a49f;font:10.5px/1.4 var(--font-mono);letter-spacing:.16em;text-transform:uppercase}.chat-drawer-head strong{display:block;margin-top:5px;font-family:var(--font-display);font-size:18px;font-weight:500;line-height:1.3}.chat-drawer-actions{display:flex;gap:8px;align-items:center}.messages{display:grid;align-content:start;gap:22px;overflow:auto;min-height:0;max-height:none;padding:22px}.message{display:grid;gap:7px;padding:0;border:0;border-radius:0;background:transparent;line-height:1.7;white-space:pre-wrap}.message.user{margin-left:0;padding-left:12px;border-left:2px solid var(--paper-edge);color:var(--ink-soft);background:transparent}.message.assistant{margin-right:0}.message[data-status=failed],.message[data-status=interrupted]{padding-left:12px;border-left:2px solid var(--cinnabar)}.message-role{color:var(--ink-muted);font:10px/1 var(--font-mono);letter-spacing:.2em;text-transform:uppercase}.message.assistant .message-role{color:var(--cinnabar)}.message-answer{white-space:pre-wrap}.message-answer .annotation-citation{color:var(--cinnabar);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}.message-reasoning{margin:0;padding:8px 10px;border:1px solid var(--paper-edge);border-radius:0;background:#f5f0e68a;color:var(--ink-muted);font:11px/1.75 var(--font-body)}.message-reasoning summary{display:inline-flex;align-items:center;gap:6px;color:var(--ink-faint);list-style:none;cursor:pointer;font:11px/1.4 var(--font-body)}.message-reasoning summary::-webkit-details-marker{display:none}.message-reasoning summary:before{content:"›";color:var(--ink-faint);font-size:14px;line-height:1;transform:translateY(-1px)}.message-reasoning[open] summary{margin-bottom:6px}.message-reasoning-body{white-space:pre-wrap}.composer{display:grid;gap:8px;margin-top:0;padding:14px 22px 18px;border-top:1px solid var(--ink)}.composer-selection{margin:0;color:var(--ink-muted);font:11px/1.55 var(--font-mono);letter-spacing:.08em}.composer textarea{min-height:92px;padding:11px 12px;font:14px/1.7 var(--font-body)}.composer-hint{margin:-2px 0 0;color:var(--ink-faint);font:8px/1.3 var(--font-mono);letter-spacing:.02em;opacity:.42}.composer-actions{display:flex;justify-content:space-between;gap:8px;align-items:center}.status{color:var(--ink-muted);font:12px/1.3 var(--font-body)}.session-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.settings-grid{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:18px}.plain-panel{padding:22px}.plain-panel h2{margin:0 0 12px}.plain-panel p,.plain-panel li{color:var(--ink-soft);line-height:1.8}.qa-records{scroll-margin-top:92px}.qa-summary-row{display:flex;flex-wrap:wrap;gap:10px;margin:0 0 14px}.qa-summary-row span{display:inline-flex;align-items:baseline;gap:6px;min-height:34px;padding:7px 10px;border:1px solid var(--paper-edge);background:var(--paper-soft);color:var(--ink-muted);font:12px/1.4 var(--font-body)}.qa-summary-row strong{color:var(--ink);font-size:18px;line-height:1}.qa-record-list{display:grid;gap:12px}.qa-record-card{display:grid;gap:12px;padding:16px 18px;border:1px solid var(--paper-edge);background:#fbf8f1e6}.qa-record-card[data-selected=true]{border-color:var(--ink);border-left-width:4px;border-left-color:var(--cinnabar)}.qa-record-head{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px;align-items:start}.qa-record-head a{color:var(--ink);font-size:18px;line-height:1.35}.qa-record-head a:hover{color:var(--cinnabar)}.qa-record-subtitle,.qa-record-meta,.qa-note-meta{color:var(--ink-muted);font:11px/1.5 var(--font-body);letter-spacing:.12em;text-transform:uppercase}.qa-record-subtitle{display:block;margin-top:4px}.qa-record-meta{white-space:nowrap}.qa-record-body{display:grid;gap:7px}.qa-snippet{position:relative;margin:0;padding-left:34px;color:var(--ink-soft);font:14px/1.75 var(--font-body)}.qa-snippet:before{content:attr(data-label);position:absolute;left:0;top:.2em;width:22px;height:22px;border:1px solid var(--paper-edge);border-radius:999px;display:grid;place-items:center;color:var(--cinnabar);font:11px/1 var(--font-body)}.qa-record-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;padding-top:12px;border-top:1px solid var(--paper-edge)}.qa-record-actions{display:flex;flex-wrap:wrap;gap:8px}.qa-record-toggle{margin:0;padding:6px 0;border:0;background:transparent;color:var(--ink-muted);font:12px/1.5 var(--font-body);letter-spacing:.08em;cursor:pointer;text-align:left}.qa-record-toggle:hover,.qa-record-toggle:focus-visible{color:var(--cinnabar);outline:none}.qa-record-card[data-expanded=true] .qa-record-body{opacity:.6}.qa-record-thread{display:grid;gap:14px;padding:14px 0 4px;border-top:1px solid var(--paper-edge)}.qa-turn{display:grid;gap:6px}.qa-turn--user{padding-left:12px;border-left:2px solid var(--paper-edge);color:var(--ink-soft)}.qa-turn[data-status=failed],.qa-turn[data-status=interrupted]{padding-left:12px;border-left:2px solid var(--cinnabar)}.qa-turn-role{color:var(--ink-muted);font:10px/1 var(--font-mono);letter-spacing:.2em;text-transform:uppercase}.qa-turn--assistant .qa-turn-role{color:var(--cinnabar)}.qa-turn-body{margin:0;color:var(--ink);font:14px/1.8 var(--font-body);white-space:pre-wrap;word-break:break-word}.turn-actions{display:inline-flex;flex-wrap:wrap;gap:8px;margin-top:6px}.turn-action-button{display:inline-flex;align-items:center;gap:5px;padding:4px 10px;border:1px solid var(--paper-edge);border-radius:999px;background:transparent;color:var(--ink-muted);font:11px/1.4 var(--font-body);letter-spacing:.08em;cursor:pointer;transition:color .12s ease,border-color .12s ease,background .12s ease}.turn-action-button svg{width:13px;height:13px}.turn-action-button:hover,.turn-action-button:focus-visible{color:var(--cinnabar);border-color:var(--cinnabar);outline:none}.turn-action-button[disabled]{cursor:progress;opacity:.6}.turn-action-button.is-done{color:var(--cinnabar);border-color:var(--cinnabar)}.qa-empty{margin:10px 0 0;color:var(--ink-muted);font:14px/1.8 var(--font-body)}@media(max-width:980px){.book-grid,.reader-layout,.session-grid,.settings-grid{grid-template-columns:1fr}.reader-layout{gap:56px}.scene3d-layout{grid-template-columns:1fr}.reader-toolbar{align-items:flex-start;flex-direction:column}.reader-nav{justify-content:flex-start}.reader-nav-bottom{margin-top:36px}.text-panel,.side-panel{min-height:auto}.book-card{border-right:0;border-bottom:1px solid var(--ink)}.book-card:last-child{border-bottom:0}}@media(max-width:640px){.topbar{align-items:flex-start;flex-direction:column;gap:12px;padding:14px 18px}.nav{flex-wrap:wrap;gap:18px}.folio{margin-left:0;font-size:10px}.topbar-auth{margin-left:0}.page{width:min(100vw - 36px,1320px);padding-top:36px}.book-card,.plain-panel{padding:18px}.text-panel{padding:0}.geometry-block{grid-template-columns:1fr;gap:8px;padding:16px}.proposition-statement,.figure-placeholder,.scene3d-block{padding:14px}.scene3d-block{overflow:hidden}.scene3d-stage{min-height:0;aspect-ratio:5 / 4}.scene3d-side{padding:10px}.proposition-statement p{font-size:20px}.unit-link{grid-template-columns:48px 1fr}.chat-launcher{right:14px;bottom:14px;min-height:44px;padding:0 14px}.chat-panel{left:12px;right:12px;bottom:0;width:auto;min-height:min(560px,calc(100vh - 42px));max-height:calc(100vh - 42px)}.chat-drawer-head,.qa-record-head{grid-template-columns:1fr}.chat-drawer-actions,.qa-record-actions{justify-content:flex-start}.reader-chat[data-open=true] .composer-actions{display:grid;grid-template-columns:auto minmax(0,1fr);padding-right:96px}.reader-chat[data-open=true] .composer-actions .button{grid-column:1;grid-row:1;justify-self:start}.reader-chat[data-open=true] .composer-actions .status{grid-column:2;grid-row:1;min-width:0;justify-self:end;text-align:right;overflow-wrap:anywhere}}.page-hero,.shelf-hero,.catalog-hero{display:grid;gap:34px;padding:24px 0 56px}.page-hero.compact{padding-bottom:22px}.page-hero h1,.shelf-hero h1,.catalog-hero h1{margin:0;color:var(--ink-deep);font-family:var(--font-display);font-size:88px;font-weight:600;line-height:1.04;letter-spacing:0}.page-hero p,.shelf-hero p,.catalog-hero p{margin:0;max-width:46rem;color:var(--ink-soft);font-size:17px;line-height:1.85}.hero-kicker,.shelf-rail,.hero-stats,.section-kicker,.stat-card span,.settings-toc span,.setting-head span,.pane-kicker{color:var(--ink-muted);font:11px/1.4 var(--font-mono);letter-spacing:.24em;text-transform:uppercase}.shelf-rail,.hero-stats{display:flex;flex-wrap:wrap;gap:10px 12px;align-items:center}.kicker{display:inline-flex;padding:5px 11px;border:1px solid var(--cinnabar);color:var(--cinnabar);font:11px/1.4 var(--font-mono);font-weight:500;letter-spacing:.24em;text-transform:uppercase}.shelf-rail .rail-meta,.hero-stats span{padding:0;border-radius:0;background:transparent;color:var(--ink-muted)}.shelf-quick-jump{margin-top:24px;display:grid;gap:10px}.shelf-section,.work-section,.setting-block{margin-top:0;padding-top:72px;border-top:1px solid var(--ink)}.section-heading,.setting-head{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap;margin-bottom:18px}.section-heading h2,.setting-head h2{margin:0;font-size:28px;line-height:1.15}.section-heading p,.setting-head p{margin:0;color:var(--ink-soft);font:15px/1.7 var(--font-body)}.section-heading a,.section-heading span:last-child{margin-inline-start:auto;color:var(--ink-muted);font:13px/1.4 var(--font-body)}.shelf-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0;border:1px solid var(--ink)}.subject-section-head,.course-map-head{display:flex;align-items:flex-end;justify-content:space-between;gap:18px;margin-bottom:18px}.subject-section-head h2,.course-map-head h3{margin:0;color:var(--ink-deep);font-family:var(--font-display);font-size:34px;line-height:1.1}.subject-section-head p,.course-map-head p{margin:6px 0 0;color:var(--ink-soft);max-width:680px}.catalog-course{margin-top:34px;padding-top:24px;border-top:1px dashed var(--paper-edge)}.course-map-head{align-items:baseline;display:grid}.course-map-head span,.section-kicker{color:var(--cinnabar);font:11px/1.4 var(--font-mono);letter-spacing:.2em;text-transform:uppercase}.pathway-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.pathway-card{display:grid;gap:8px;min-height:138px;padding:18px;border:1px solid var(--paper-edge);background:var(--paper)}.pathway-card:hover{border-color:var(--ink);background:var(--paper-soft)}.pathway-card strong{color:var(--ink);font-size:18px;line-height:1.3}.pathway-card span{color:var(--ink-soft);font-size:14px;line-height:1.7}.shelf-card,.future-book,.catalog-tab,.stat-card,.settings-toc,.setting-block,.record-action,.toggle-row,.size-row,.annot-tab,.history-table-wrap,.rubric-card{border:1px solid var(--paper-edge);border-radius:0;background:var(--paper)}.shelf-card{padding:36px 36px 30px;display:grid;gap:10px;border:0;border-right:1px solid var(--ink)}.shelf-card:last-child{border-right:0}.shelf-card-head{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;color:var(--ink-muted);font:11px/1.4 var(--font-mono);letter-spacing:.24em;text-transform:uppercase}.shelf-card h3{margin:0;color:var(--ink-deep);font-family:var(--font-display);font-size:38px;font-weight:600;letter-spacing:0;line-height:1.1}.native-title{margin:0;color:var(--cinnabar);font:11px/1.4 var(--font-mono);letter-spacing:.18em;text-transform:uppercase}.shelf-lead,.shelf-card blockquote,.future-book p,.catalog-hero p,.pane-head p,.rubric-context p,.toggle-row p,.record-action p,.boundary-box p{margin:0;color:var(--ink-soft);font-size:15px;line-height:1.8}.shelf-card blockquote{padding:22px 0;border-top:1px dashed var(--paper-edge);border-bottom:1px dashed var(--paper-edge);border-left:0;color:var(--ink);font-family:var(--font-display)}.shelf-meta{display:flex;flex-wrap:wrap;gap:8px;color:var(--ink-muted);font:12px/1.4 var(--font-mono)}.shelf-meta span{padding:0;border-radius:0;background:transparent}.shelf-actions,.rubric-foot,.record-actions{display:flex;flex-wrap:wrap;gap:10px}.subject-hero-quote{width:min(740px,100%);margin:10px 0 0;padding:14px 0 0 18px;border-left:3px solid var(--paper-edge);color:var(--ink-soft);font-size:15px;line-height:1.75}.subject-hero-quote p{margin:0}.subject-hero-quote .line-en{color:var(--ink-muted);font-style:italic}.cs-subject-page{--cs-accent: oklch(42% .09 218);--cs-accent-soft: oklch(95% .024 218)}.cs-subject-page .hero-kicker,.cs-subject-page .section-kicker,.cs-subject-page .native-title,.cs-subject-page .history-topic-card span{color:var(--cs-accent)}.cs-subject-page .subject-hero-quote{border-left-color:var(--cs-accent)}.cs-subject-page .history-map-shell{border-color:color-mix(in oklab,var(--cs-accent),var(--ink) 42%)}.cs-subject-page .history-map-scroll{background:linear-gradient(180deg,color-mix(in oklab,var(--cs-accent-soft),white 38%),#f6fafc9e)}.cs-subject-page .history-node-dot{stroke:var(--cs-accent)}.cs-subject-page .history-node-badge,.cs-subject-page .history-node-link.status-online .history-node-status{fill:var(--cs-accent)}.math-history-hero{padding-bottom:34px}.history-map-shell{display:grid;gap:14px;padding:18px;border:1px solid var(--ink);background:var(--paper)}.history-map-head,.shelf-era-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;flex-wrap:wrap}.history-map-head h2,.shelf-era-head h3{margin:0;color:var(--ink-deep);font-family:var(--font-display);font-weight:500;line-height:1.1}.history-map-head h2{font-size:28px}.history-map-head>span:last-child{color:var(--ink-muted);font:12px/1.4 var(--font-body)}.history-map-scroll{overflow-x:auto;border:1px solid var(--paper-edge);background:linear-gradient(180deg,#ffffffb8,#f6f1e6a3);scroll-snap-type:x proximity}.history-map-svg{display:block;width:1900px;max-width:none;height:520px}.history-axis,.history-tick line,.history-node-stem{stroke:var(--paper-edge);stroke-width:2}.history-tick text,.history-node-year,.history-node-status,.history-node-badge{fill:var(--ink-muted);font:20px var(--font-mono);letter-spacing:0}.history-node-card{fill:var(--paper);stroke:var(--paper-edge);stroke-width:2;transition:fill .14s ease,stroke .14s ease}.history-node-dot{fill:var(--paper);stroke:var(--cinnabar);stroke-width:4}.history-node-name{fill:var(--ink-deep);font:600 21px var(--font-body)}.history-node-desc{fill:var(--ink-soft);font:17px var(--font-body)}.history-node-badge{fill:var(--cinnabar);font-size:13px;letter-spacing:.08em}.history-node-link:hover .history-node-card,.history-node-link:focus-visible .history-node-card{fill:var(--paper-soft);stroke:var(--ink)}.history-node-link.status-online .history-node-status{fill:var(--celadon)}.history-node-link.status-draft .history-node-status{fill:var(--ochre)}.history-node-link.status-planned .history-node-dot{stroke:var(--ink-faint)}.history-node-link.history-node-foundation .history-node-card{stroke:color-mix(in oklab,var(--cinnabar),var(--ink) 25%)}.history-node-link.history-node-foundation .history-node-dot{fill:color-mix(in oklab,var(--cinnabar),var(--paper) 78%)}.history-node-link.history-node-qing .history-node-card{stroke:color-mix(in oklab,var(--celadon),var(--ink) 28%)}.history-node-link.history-node-gap .history-node-card{stroke-dasharray:7 5}.classic-shelf-section{padding-top:56px}.shelf-era{display:grid;gap:14px;margin-top:28px}.shelf-era-head{padding-bottom:10px;border-bottom:1px solid var(--paper-edge)}.shelf-era-head h3{font-size:25px}.shelf-era-head p{margin:0;color:var(--ink-soft);font-size:14px;line-height:1.7}.shelf-placeholder{display:flex;justify-content:space-between;gap:18px;padding:16px 18px;border:1px dashed var(--paper-edge);color:var(--ink-muted);background:#fcf9f17a}.shelf-placeholder strong{color:var(--ink-soft);font:12px/1.4 var(--font-mono);letter-spacing:.16em;text-transform:uppercase}.history-topic-section{padding-top:56px}.history-topic-groups{display:grid;gap:28px}.history-topic-group{display:grid;gap:12px}.history-topic-group-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;padding-bottom:8px;border-bottom:1px solid var(--paper-edge)}.history-topic-group-head h3{margin:0;color:var(--ink-deep);font-family:var(--font-display);font-size:24px;font-weight:500}.history-topic-group-head span{color:var(--ink-muted);font:12px/1.4 var(--font-mono)}.history-topic-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-top:1px solid var(--ink);border-left:1px solid var(--ink)}.history-topic-card{display:grid;gap:10px;min-height:214px;padding:22px;border-right:1px solid var(--ink);border-bottom:1px solid var(--ink);background:var(--paper);color:var(--ink-deep)}.history-topic-card:hover,.history-topic-card:focus-visible{background:var(--paper-soft)}.history-topic-card span{color:var(--cinnabar);font:11px/1.4 var(--font-mono);letter-spacing:.14em;text-transform:uppercase}.history-topic-card strong{font-family:var(--font-display);font-size:24px;font-weight:500;line-height:1.2}.history-topic-card em{color:var(--ink-soft);font-style:normal;font-size:14px;line-height:1.75}.math-extra-entry{margin-top:56px;padding-top:22px;border-top:1px solid var(--paper-edge)}.math-extra-entry a{display:flex;align-items:baseline;justify-content:space-between;gap:16px;padding:14px 0;color:var(--ink-muted)}.math-extra-entry a:hover{color:var(--ink-deep)}.math-extra-entry span{font:12px/1.4 var(--font-mono);letter-spacing:.16em;text-transform:uppercase}.math-extra-entry strong{font-family:var(--font-display);font-size:22px;font-weight:500}.extras-page{width:min(1080px,calc(100vw - 56px));margin:0 auto;padding:56px 0 96px;--extras-cold: oklch(42% .09 218);--extras-cold-soft: oklch(95% .025 218)}.extras-page.narrow{width:min(820px,calc(100vw - 56px))}.extras-hero{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;padding-bottom:30px;border-bottom:1px solid var(--ink)}.extras-hero.compact{align-items:center}.extras-hero h1{margin:6px 0 10px;color:var(--ink-deep);font-family:var(--font-display);font-size:clamp(42px,6vw,72px);font-weight:600;line-height:1.02}.extras-hero p{max-width:46rem;margin:0;color:var(--ink-soft);font-size:16px;line-height:1.8}.extras-stats,.extras-problem-actions,.extras-axis-links{display:flex;flex-wrap:wrap;gap:10px}.extras-stats{justify-content:flex-end}.extras-stats span,.extras-axis-links a{padding:5px 9px;border:1px solid var(--paper-edge);color:var(--ink-muted);background:var(--paper);font:12px/1.4 var(--font-mono)}.extras-section{display:grid;gap:16px;padding-top:38px}.extras-section.compact{padding-top:28px}.extras-section-lead{margin:-4px 0 2px;color:var(--ink-soft);font-size:14px;line-height:1.7}.extras-filter{display:flex;flex-wrap:wrap;gap:8px}.extras-filter-stack{display:grid;gap:10px}.extras-filter-pill{padding:7px 12px;border:1px solid var(--paper-edge);color:var(--ink-muted);background:var(--paper);font:12px/1.4 var(--font-mono)}.extras-filter-pill:hover,.extras-filter-pill:focus-visible,.extras-filter-pill.active{border-color:var(--ink);color:var(--ink-deep);background:var(--paper-soft)}.extras-collection-card,.extras-axis-card,.extras-mini-card,.extras-year-card,.extras-topic-card,.extras-problem-card{border:1px solid var(--paper-edge);background:var(--paper)}.extras-discipline-group{display:grid;gap:12px;padding-top:8px}.extras-discipline-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px}.extras-discipline-head h3{margin:0;color:var(--ink-deep);font-family:var(--font-display);font-size:28px;font-weight:500}.extras-discipline-head span{color:var(--ink-muted);font:12px/1.4 var(--font-mono)}.extras-collection-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.extras-collection-card{position:relative;display:grid;grid-template-columns:52px minmax(0,1fr);align-items:start;gap:14px 18px;padding:22px}.extras-collection-card>div:nth-child(2){display:grid;gap:6px}.collection-mark{display:grid;place-items:center;width:44px;aspect-ratio:1;border:1px solid color-mix(in oklab,var(--extras-cold),transparent 35%);color:var(--extras-cold);background:var(--extras-cold-soft);font:700 12px/1 var(--font-mono);letter-spacing:0}.extras-collection-card.discipline-physics{--extras-cold: oklch(45% .095 205);--extras-cold-soft: oklch(96% .03 205)}.extras-collection-card.discipline-logic{--extras-cold: oklch(43% .08 318);--extras-cold-soft: oklch(96% .025 318)}.extras-collection-card.discipline-cs,.extras-discipline-group.discipline-cs{--extras-cold: oklch(42% .08 225);--extras-cold-soft: oklch(96% .026 225);--extras-signal: oklch(45% .08 165)}.extras-placeholder-card{border-color:color-mix(in oklab,var(--extras-cold),transparent 42%);background:linear-gradient(135deg,color-mix(in oklab,var(--extras-cold-soft),transparent 8%),var(--paper) 62%)}.extras-placeholder-card .extras-card-stats span{color:color-mix(in oklab,var(--extras-cold),var(--ink-muted) 28%)}.extras-page.collection-loyd-puzzles,.extras-collection-card.collection-loyd-puzzles{--extras-cold: oklch(44% .14 24);--extras-cold-soft: oklch(96% .035 24);--extras-signal: oklch(43% .1 166)}.extras-page.collection-loyd-puzzles .extras-hero{border-bottom-color:color-mix(in oklab,var(--extras-cold),var(--extras-signal) 40%)}.extras-page.collection-loyd-puzzles .extras-axis-card:nth-child(2),.extras-page.collection-loyd-puzzles .extras-topic-card:nth-child(2n){border-color:color-mix(in oklab,var(--extras-signal),transparent 45%)}.extras-card-kickers{display:flex;flex-wrap:wrap;gap:8px;align-items:center}.extras-collection-card span,.extras-axis-card span{color:var(--extras-cold);font:11px/1.4 var(--font-mono);letter-spacing:.16em;text-transform:uppercase}.extras-collection-card .extras-card-badge{padding:2px 7px;border:1px solid color-mix(in oklab,var(--extras-cold),transparent 45%);color:var(--ink-deep);background:var(--extras-cold-soft);letter-spacing:.08em}.extras-collection-card h3{margin:0;color:var(--ink-deep);font-family:var(--font-display);font-size:36px;line-height:1.1}.extras-collection-card p:not(.native-title){max-width:40rem;margin:0;color:var(--ink-soft);font-size:15px;line-height:1.75}.extras-card-stats,.difficulty-spark,.extras-sample,.extras-collection-card .extras-axis-links,.extras-collection-card>.button{grid-column:2}.extras-card-stats{display:flex;flex-wrap:wrap;gap:8px}.extras-card-stats span{padding:3px 0;color:var(--ink-muted);letter-spacing:.08em}.difficulty-spark{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:5px;align-items:end;height:18px}.difficulty-spark span{width:var(--w);max-width:100%;height:8px;background:color-mix(in oklab,var(--extras-cold),var(--paper) 42%)}.extras-sample{display:grid;gap:3px;padding:9px 10px;border-left:2px solid color-mix(in oklab,var(--extras-cold),transparent 35%);background:color-mix(in oklab,var(--extras-cold-soft),transparent 35%)}.extras-sample span{color:var(--extras-cold)}.extras-sample strong{color:var(--ink-deep);font-size:14px;line-height:1.4}.extras-breadcrumb{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:8px;color:var(--ink-muted);font:12px/1.4 var(--font-mono)}.extras-breadcrumb a{color:inherit}.extras-breadcrumb a:hover{color:var(--ink-deep)}.extras-axis-grid,.extras-mini-grid,.extras-topic-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.extras-axis-card,.extras-mini-card,.extras-topic-card{display:grid;align-content:start;gap:7px;min-height:136px;padding:18px}.extras-axis-card:hover,.extras-mini-card:hover,.extras-year-card:hover,.extras-topic-card:hover,.extras-problem-card:hover{border-color:var(--ink);background:var(--paper-soft)}.extras-axis-card strong,.extras-mini-card strong,.extras-topic-card strong{color:var(--ink-deep);font-family:var(--font-display);font-size:24px;font-weight:500;line-height:1.15}.extras-axis-card em,.extras-mini-card span,.extras-topic-card span,.extras-topic-card em{color:var(--ink-muted);font-style:normal;font-size:13px;line-height:1.6}.extras-year-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(112px,1fr));gap:10px}.extras-year-card{display:grid;gap:2px;padding:16px}.extras-year-card strong{color:var(--ink-deep);font-family:var(--font-display);font-size:28px;font-weight:500;line-height:1.1}.extras-year-card span{color:var(--ink-muted);font:12px/1.4 var(--font-mono)}.extras-problem-list{display:grid;gap:8px;margin:0;padding:0;list-style:none}.extras-problem-card{display:grid;grid-template-columns:96px minmax(0,1fr);gap:6px 14px;align-items:baseline;padding:13px 15px}.extras-problem-card span{grid-row:span 2;color:var(--extras-cold);font:12px/1.4 var(--font-mono)}.extras-problem-card strong{color:var(--ink-deep);font-size:16px;line-height:1.35}.extras-problem-card em{color:var(--ink-muted);font-style:normal;font-size:13px;line-height:1.5}.extras-problem-layout{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:18px;align-items:start;margin-top:24px}.extras-problem-side{position:sticky;top:86px}.extras-meta-list{display:grid;gap:12px;margin:0}.extras-meta-list div{display:grid;gap:3px}.extras-meta-list dt{color:var(--ink-muted);font:11px/1.4 var(--font-mono);letter-spacing:.16em;text-transform:uppercase}.extras-meta-list dd{margin:0;color:var(--ink-soft);font-size:14px;line-height:1.6}.extras-meta-list a{color:var(--extras-cold)}.extras-problem-section{display:grid;gap:14px}.extras-problem-section+.extras-problem-section{margin-top:26px;padding-top:24px;border-top:1px solid var(--paper-edge)}.challenge-badge{width:100%;min-height:42px;margin:0 0 16px;border:1px solid var(--paper-edge);background:var(--paper);color:var(--extras-cold);font:12px/1.4 var(--font-mono);letter-spacing:.12em}.challenge-badge[data-state=done]{border-color:var(--extras-cold);background:var(--extras-cold-soft);color:var(--ink-deep)}.topic-guide-panel{border-top:2px solid var(--ink);border-bottom:1px solid var(--paper-edge);padding:24px 0 22px}.topic-guide-body{color:var(--ink-soft);font-size:16px;line-height:1.85}.topic-guide-body p{margin:0 0 1.1em}.topic-switcher{display:flex;flex-wrap:wrap;gap:8px;padding-top:8px}.topic-switcher a{border:1px solid var(--paper-edge);padding:6px 10px;color:var(--ink-muted);background:var(--paper);font:12px/1.4 var(--font-mono)}.topic-switcher a[aria-current=page]{border-color:var(--extras-cold);color:var(--ink-deep);background:var(--extras-cold-soft)}.future-shelf{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.future-book{padding:18px;display:grid;gap:10px;min-height:180px}.future-book h3{margin:6px 0 0;font-size:24px;line-height:1.1}.catalog-tabs{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:10px;margin:22px 0 18px}.catalog-search{margin-top:22px;display:grid;gap:10px}.catalog-search label{color:var(--ink-muted);font:11px/1.4 var(--font-mono);letter-spacing:.2em;text-transform:uppercase}.catalog-search-box{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:10px;align-items:center}.catalog-search input,.catalog-search-box input{width:100%;min-height:44px;border:1px solid var(--paper-edge);background:var(--paper);color:var(--ink);padding:0 14px}.catalog-results{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:10px}.catalog-result{min-height:112px;padding:14px;display:grid;align-content:start;gap:5px;border:1px solid var(--paper-edge);background:var(--paper)}.catalog-result:hover{border-color:var(--ink);background:var(--paper-soft)}.catalog-result span,.catalog-result em{color:var(--ink-muted);font:11px/1.5 var(--font-body);letter-spacing:.12em;text-transform:uppercase;font-style:normal}.catalog-result strong{color:var(--ink);font-size:17px;line-height:1.3}.catalog-result em{overflow:hidden;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;letter-spacing:0;text-transform:none}.catalog-no-results{margin:0;padding:14px;color:var(--ink-muted);border:1px solid var(--paper-edge);background:var(--paper)}.catalog-tab{padding:16px 18px;text-align:left;display:grid;gap:6px;transition:border-color .14s ease,background .14s ease}.catalog-tab.active,.catalog-tab:hover{border-color:var(--ink);background:var(--paper-soft)}.tab-index,.tab-meta{color:var(--ink-muted);font:11px/1.4 var(--font-body);letter-spacing:.16em;text-transform:uppercase}.tab-title{font-size:22px;line-height:1.15}.catalog-pane{display:none;margin-top:18px}.catalog-pane.active{display:block}.pane-head{display:grid;gap:8px;margin-bottom:22px;padding-bottom:18px;border-bottom:1px solid var(--ink)}.pane-head h2{margin:0;font-size:clamp(34px,4vw,52px);line-height:1}.catalog-section{margin-top:24px}.catalog-section .section-head{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap;margin-bottom:14px;padding-bottom:12px;border-bottom:1px solid var(--paper-edge)}.catalog-section .section-head h3{margin:0;font-size:24px;line-height:1.15}.section-count{margin-inline-start:auto;color:var(--ink-muted);font:12px/1.4 var(--font-body)}.catalog-section-body{display:grid;gap:16px 18px;align-items:start}.catalog-section.has-illustration .catalog-section-body{grid-template-columns:minmax(260px,320px) minmax(0,1fr)}.section-illustration{margin:0;display:grid;gap:8px}.section-illustration img{display:block;width:100%;aspect-ratio:3 / 2;-o-object-fit:cover;object-fit:cover;border:1px solid var(--paper-edge);background:var(--paper-warm)}.section-illustration figcaption{color:var(--ink-soft);font:13px/1.7 var(--font-body)}.entry-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:8px}.entry{display:grid;grid-template-columns:36px minmax(0,1fr);gap:10px;align-items:center;min-height:0;padding:10px 12px;border:1px solid transparent;background:#f5f0e68c;transition:border-color .14s ease,background .14s ease}.entry:hover,.entry.featured{border-color:var(--paper-edge);background:var(--paper-soft)}.entry.featured{background:#dfece49e}.entry-num{color:var(--cinnabar);font:11px/1.2 var(--font-mono);letter-spacing:.1em;text-transform:uppercase}.entry-body{min-width:0;display:grid;gap:2px}.entry-name{display:flex;align-items:baseline;gap:6px;flex-wrap:wrap;color:var(--ink);font-size:14.5px;line-height:1.4}.badge{color:var(--cinnabar);font:11px/1.2 var(--font-mono);letter-spacing:.16em;text-transform:uppercase;border:1px solid var(--cinnabar);padding:1px 5px}.catalog-progress{margin-top:18px}.catalog-progress .progress-inner,.progress-inner{background:var(--paper-3);border:1px solid var(--ink);padding:20px 22px;display:flex;align-items:center;gap:18px;flex-wrap:wrap}.progress-label{color:var(--ink-muted);font:10.5px/1.4 var(--font-body);letter-spacing:.18em;text-transform:uppercase}.progress-bar{flex:1 1 180px;height:6px;min-width:160px;background:var(--rule);position:relative}.progress-fill{position:absolute;inset:0;width:100%;background:var(--cinnabar)}.progress-stat{color:var(--ink);font-size:14px}.stat-strip{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}.stat-card{padding:18px 20px 16px;display:grid;gap:8px}.stat-card strong{font-size:34px;line-height:1}.stat-card em{color:var(--ink-muted);font:12px/1.4 var(--font-body);font-style:normal}.history-table-wrap{overflow:hidden}.session-tools{display:grid;gap:12px;margin-bottom:14px}.record-tabs,.session-filters{display:flex;flex-wrap:wrap;gap:8px;align-items:center}.session-filters input,.session-filters select{min-height:38px;padding:0 10px;border:1px solid var(--paper-edge);background:var(--paper);color:var(--ink)}.session-filters input{flex:1 1 260px}.history-table{width:100%;border-collapse:collapse}.history-table thead th{padding:14px 12px;text-align:start;color:var(--ink-muted);font:10.5px/1.4 var(--font-body);letter-spacing:.18em;text-transform:uppercase;border-bottom:1px solid var(--ink);background:var(--paper-2)}.history-table tbody td{padding:16px 12px;border-bottom:1px solid var(--paper-edge);vertical-align:top}.history-table tbody tr:last-child td{border-bottom:0}.history-table tbody tr:hover{background:var(--paper-2)}.col-date{font:13px/1.6 var(--font-mono)}.col-passage{font-size:15px;line-height:1.5}.col-passage span{display:block;margin-top:4px;color:var(--ink-muted);font:11px/1.4 var(--font-body);letter-spacing:.14em;text-transform:uppercase}.col-stat,.col-action{color:var(--ink-soft);font-size:14px}.col-stat small{display:block;margin-top:3px;color:var(--ink-muted);font:11px/1.3 var(--font-mono)}.rating-low{color:var(--cinnabar);font-weight:600}.rating-ok{color:var(--celadon);font-weight:600}.col-action{text-align:end}.empty-cell{padding:24px 16px!important;color:var(--ink-muted);text-align:center}.settings-layout{display:grid;grid-template-columns:200px minmax(0,1fr);gap:24px;align-items:start}.settings-toc{position:sticky;top:96px;padding:14px;display:grid;gap:10px}.settings-toc a{color:var(--ink-soft);font:14px/1.4 var(--font-body)}.settings-stack{display:grid;gap:18px}.toggle-list{display:grid;gap:12px}.toggle-row,.size-row{padding:18px 20px;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:18px;align-items:center}.toggle-row strong,.size-row strong,.record-action span:first-child,.boundary-box strong{display:block;margin-bottom:6px;font-size:18px;line-height:1.25}.switch{width:50px;height:28px;border:1px solid var(--paper-edge);background:var(--paper-2);position:relative;border-radius:999px}.switch:after{content:"";position:absolute;left:3px;top:3px;width:20px;height:20px;border-radius:50%;background:var(--ink);transition:left .14s ease,background .14s ease}.switch.on{background:var(--cinnabar);border-color:var(--cinnabar)}.switch.on:after{left:25px;background:var(--paper-soft)}.size-row{margin-top:12px}.seg{display:inline-flex;border:1px solid var(--ink);overflow:hidden}.seg button{padding:10px 18px;border-inline-end:1px solid var(--paper-edge);background:var(--paper);color:var(--ink-soft)}.seg button:last-child{border-inline-end:0}.seg button.on{background:var(--ink);color:var(--paper-soft)}.size-preview{margin:0;padding:18px 20px;border-left:2px solid var(--cinnabar);background:#fffcf5b3;font-size:18px;line-height:1.9}.annot-tabs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.annot-tab{padding:18px 18px 16px;display:grid;gap:8px;text-align:left}.annot-tab span{color:var(--cinnabar);font-size:18px}.annot-tab strong{color:var(--ink);font:11px/1.4 var(--font-body);letter-spacing:.16em;text-transform:uppercase}.annot-tab p{margin:0;color:var(--ink-soft);font-size:14px;line-height:1.75}.annot-tab.on,.annot-tab:hover{border-color:var(--ink);background:var(--paper-soft)}.boundary-box{margin-top:14px;padding:18px 20px;border:1px solid var(--paper-edge);background:#dfece499}.record-actions{display:grid;grid-template-columns:repeat(3,minmax(0,1fr))}.record-action{padding:18px 18px 16px;text-align:left}.record-action strong{display:block;margin-top:4px;color:var(--cinnabar);font:11px/1.4 var(--font-body);letter-spacing:.16em;text-transform:uppercase}.record-action.danger{border-color:var(--cinnabar)}.savebar{position:sticky;bottom:16px;margin-top:12px;padding:14px 16px;display:flex;align-items:center;gap:12px;flex-wrap:wrap;background:var(--ink);color:var(--paper-soft)}.savebar .button.secondary{background:transparent;color:var(--paper-soft);border-color:#fbf8f14d}.savebar .button{background:var(--cinnabar);border-color:var(--cinnabar)}.rubric-card{display:grid;grid-template-columns:minmax(0,1fr) minmax(360px,1fr);overflow:hidden}.rubric-context{padding:24px;border-inline-end:1px solid var(--paper-edge);display:grid;gap:14px}.rubric-context .label{color:var(--cinnabar);font:11px/1.4 var(--font-body);letter-spacing:.18em;text-transform:uppercase}.rubric-context h3{margin:0;font-size:28px;line-height:1.15}.rubric-context dl{margin:0;display:grid;grid-template-columns:auto 1fr;gap:8px 12px;padding-top:12px;border-top:1px dashed var(--paper-edge)}.rubric-context dt{color:var(--ink-muted);font:11px/1.4 var(--font-body);letter-spacing:.16em;text-transform:uppercase}.rubric-form{padding:24px;display:grid;gap:16px}.dim{display:grid;grid-template-columns:1fr auto;gap:8px 14px;padding:16px 0;border-bottom:1px dashed var(--paper-edge)}.dim:last-of-type{border-bottom:0}.dim-name{font-size:18px;line-height:1.2}.dim-scale{display:flex;gap:4px;align-items:center}.dim-dot{width:28px;height:28px;border:1px solid var(--paper-edge);background:var(--paper);color:var(--ink-muted);font:11px/1 var(--font-mono)}.dim-dot.on{background:var(--cinnabar);border-color:var(--cinnabar);color:var(--paper-soft)}.rubric-form button:disabled{cursor:not-allowed;opacity:.45}.dim-desc{grid-column:1 / -1;margin:0;color:var(--ink-soft);font-size:14px;line-height:1.7}.rubric-foot .total{margin-right:auto;color:var(--ink-soft);font-size:14px}.rubric-error{color:var(--cinnabar);font-size:13px}button[aria-disabled=true]{opacity:.45;pointer-events:none}@media(max-width:1080px){.shelf-grid,.future-shelf,.record-actions,.stat-strip,.entry-grid,.pathway-grid,.history-topic-grid,.extras-axis-grid,.extras-mini-grid,.extras-topic-grid,.extras-collection-grid,.rubric-card,.settings-layout{grid-template-columns:1fr}.extras-collection-card{grid-template-columns:44px minmax(0,1fr)}.extras-problem-layout{grid-template-columns:1fr}.extras-problem-side,.settings-toc{position:relative;top:0}.shelf-card{border-right:0;border-bottom:1px solid var(--ink)}.shelf-card:last-child{border-bottom:0}}@media(max-width:720px){.page-hero h1,.shelf-hero h1,.catalog-hero h1{font-size:44px}.entry-grid,.catalog-section-body{grid-template-columns:1fr}.catalog-section .section-head,.section-heading,.setting-head,.extras-hero,.subject-section-head{align-items:flex-start;flex-direction:column}.history-map-shell{padding:12px}.history-map-svg{width:1500px;height:430px}.extras-page,.extras-page.narrow{width:min(100% - 28px,1080px);padding-top:34px}.extras-hero h1{font-size:42px}.extras-problem-card{grid-template-columns:1fr}.extras-problem-card span{grid-row:auto}.extras-collection-card{grid-template-columns:1fr}.collection-mark,.extras-card-stats,.difficulty-spark,.extras-sample,.extras-collection-card .extras-axis-links,.extras-collection-card>.button{grid-column:1}.section-heading a,.section-heading span:last-child{margin-inline-start:0}.toggle-row,.size-row{grid-template-columns:1fr}.rubric-context{border-inline-end:0;border-bottom:1px solid var(--paper-edge)}.annot-tabs{grid-template-columns:1fr}}.catalog{width:min(680px,calc(100vw - 56px));margin:0 auto;padding:80px 0 96px}.catalog-intro{display:grid;gap:22px;padding-bottom:48px;border-bottom:1px solid var(--ink)}.catalog-intro h1{margin:0;font-family:var(--font-display);font-size:clamp(48px,7vw,72px);font-weight:600;line-height:1;letter-spacing:-.02em;color:var(--ink-deep)}.catalog-intro p{margin:0;max-width:36rem;color:var(--ink-soft);font-size:17px;line-height:1.85}.catalog-finder{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:10px;align-items:center;margin-top:6px}.catalog-finder input{width:100%;min-height:44px;padding:0 14px;border:1px solid var(--paper-edge);background:var(--paper);color:var(--ink);font:15px/1.4 var(--font-body)}.catalog-finder-results{display:grid;gap:6px;margin-top:-10px}.finder-result{display:grid;gap:3px;padding:12px 14px;border:1px solid var(--paper-edge);background:var(--paper)}.finder-result:hover{border-color:var(--ink);background:var(--paper-soft)}.finder-result-meta{color:var(--ink-muted);font:11px/1.4 var(--font-mono);letter-spacing:.16em;text-transform:uppercase}.finder-result strong{color:var(--ink);font-family:var(--font-display);font-size:17px;line-height:1.3}.finder-result em{color:var(--ink-soft);font-style:normal;font-size:13px;line-height:1.5}.finder-no-results{margin:0;padding:12px 14px;border:1px solid var(--paper-edge);color:var(--ink-muted);font-size:14px}.subject-block{padding-top:56px}.subject-block h2{margin:0 0 8px;font-family:var(--font-display);font-size:32px;font-weight:500;line-height:1.2;letter-spacing:-.01em;color:var(--ink-deep)}.subject-block h2 a{color:inherit}.subject-block h2 a:hover{color:var(--cinnabar)}.subject-desc{margin:0 0 22px;max-width:36rem;color:var(--ink-soft);font-size:15px;line-height:1.75}.course-list{margin:0;padding:0;list-style:none;border-top:1px solid var(--paper-edge)}.course-row{border-bottom:1px solid var(--paper-edge)}.course-row a{display:grid;grid-template-columns:36px minmax(0,1fr) auto;gap:18px;align-items:baseline;padding:18px 0;color:inherit}.course-row a:hover .course-no,.course-row a:hover .course-name strong{color:var(--cinnabar)}.course-no{color:var(--ink-muted);font:11px/1.2 var(--font-mono);letter-spacing:.16em;align-self:center}.course-name{display:grid;gap:4px;min-width:0}.course-name strong{color:var(--ink-deep);font-family:var(--font-display);font-size:19px;font-weight:500;line-height:1.35}.course-name em{color:var(--ink-muted);font-style:normal;font-size:13px;line-height:1.55}.course-meta{align-self:center;white-space:nowrap;color:var(--ink-muted);font:11px/1.4 var(--font-mono);letter-spacing:.14em;text-transform:uppercase}@media(max-width:520px){.catalog{padding:48px 0 64px}.catalog-finder{grid-template-columns:1fr}.course-row a{grid-template-columns:28px minmax(0,1fr);gap:12px;padding:14px 0}.course-meta{grid-column:2;align-self:start}}.lightbox{position:fixed;inset:0;z-index:200;display:grid;place-items:center;background:#0f0a07eb;overscroll-behavior:contain}.lightbox[hidden]{display:none!important}.lightbox-stage{position:relative;width:100%;height:100%;overflow:hidden;touch-action:none;cursor:grab}.lightbox-stage[data-grabbing=true]{cursor:grabbing}.lightbox img{position:absolute;top:50%;left:50%;max-width:90vw;max-height:86vh;width:auto;height:auto;transform:translate(-50%,-50%);transform-origin:center center;-webkit-user-select:none;-moz-user-select:none;user-select:none;-webkit-user-drag:none;-webkit-touch-callout:none;background:var(--paper-warm);box-shadow:0 24px 60px #0009;will-change:transform,opacity}.lightbox img[data-animating=true]{transition:transform .16s ease-out,opacity .16s ease-out}.lightbox-toolbar{position:fixed;top:calc(env(safe-area-inset-top,0px) + 16px);right:calc(env(safe-area-inset-right,0px) + 16px);display:flex;gap:8px;z-index:1}.lightbox-toolbar button{width:40px;height:40px;display:grid;place-items:center;border:1px solid oklch(85% .005 75 / .4);background:#0f0a0799;color:#f0eeeb;font:16px/1 var(--font-mono);cursor:pointer;transition:border-color .12s ease,background .12s ease}.lightbox-toolbar button:hover{border-color:#f0eeeb;background:#0f0a07d9}.lightbox-caption{position:fixed;bottom:calc(env(safe-area-inset-bottom,0px) + 20px);left:50%;transform:translate(-50%);max-width:min(720px,80vw);margin:0;padding:8px 14px;color:#d4d0cb;font:12px/1.5 var(--font-mono);letter-spacing:.08em;text-align:center;background:#0f0a0780;pointer-events:none}.lightbox-caption[hidden]{display:none}.lightbox-hint{position:fixed;top:calc(env(safe-area-inset-top,0px) + 16px);left:16px;margin:0;color:#bab7b2b3;font:11px/1.5 var(--font-mono);letter-spacing:.12em;text-transform:uppercase;pointer-events:none}.lightbox-minimap{position:fixed;top:calc(env(safe-area-inset-top,0px) + 16px);left:50%;transform:translate(-50%);border:1px solid oklch(85% .005 75 / .4);background-color:#0f0a078c;background-size:100% 100%;background-repeat:no-repeat;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);box-shadow:0 8px 24px #00000073;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .16s ease,visibility 0s linear .16s;z-index:1}.lightbox-minimap[data-active=true]{opacity:1;visibility:visible;transition:opacity .16s ease,visibility 0s linear 0s}.lightbox-minimap-viewport{position:absolute;border:1.5px solid oklch(96% .005 75 / .95);background:#f4f1ee1f;box-shadow:0 0 0 1px #0f0a0799;pointer-events:none;box-sizing:border-box}@media(hover:none)and (pointer:coarse){.lightbox-stage{cursor:default}.lightbox img{max-width:100vw;max-height:100vh}.lightbox-toolbar{top:auto;right:auto;left:50%;bottom:calc(env(safe-area-inset-bottom,0px) + 24px);transform:translate(-50%);gap:12px;padding:8px;background:#0f0a078c;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-radius:999px}.lightbox-toolbar button{width:48px;height:48px;border-radius:999px;font-size:20px;border-color:#d0cdca40;background:transparent}.lightbox-hint{top:auto;left:50%;bottom:calc(env(safe-area-inset-bottom,0px) + 92px);transform:translate(-50%);padding:6px 12px;background:#0f0a0766;border-radius:999px;text-align:center}.lightbox-caption{bottom:calc(env(safe-area-inset-bottom,0px) + 124px);font-size:11px;padding:6px 12px;background:#0f0a078c;backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);border-radius:999px}}.map{width:min(1080px,calc(100vw - 56px));margin:0 auto;padding:48px 0 96px}.map-search{display:grid;gap:10px;margin-bottom:28px}.map-tabs{display:flex;flex-wrap:wrap;gap:4px 28px;margin:0 0 36px;padding:0;border-bottom:1px solid var(--ink)}.map-tab{display:inline-flex;align-items:baseline;gap:10px;padding:10px 0 12px;margin-bottom:-1px;border:0;border-bottom:2px solid transparent;background:transparent;color:var(--ink-soft);cursor:pointer;transition:color .12s ease,border-color .12s ease}.map-tab:hover{color:var(--ink-deep)}.map-tab.active{color:var(--ink-deep);border-bottom-color:var(--cinnabar)}.map-tab-title{font-family:var(--font-display);font-size:19px;font-weight:500;line-height:1.3}.map-tab-count{color:var(--ink-muted);font:11px/1.4 var(--font-mono);letter-spacing:.12em}.map-tab.active .map-tab-count{color:var(--cinnabar)}.subject-directory-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:18px;padding-bottom:18px;border-bottom:1px solid var(--paper-edge)}.subject-directory-head h2{margin:4px 0 6px;color:var(--ink-deep);font-family:var(--font-display);font-size:clamp(32px,4vw,46px);font-weight:500;line-height:1.08}.subject-directory-head p{max-width:42rem;margin:0;color:var(--ink-soft);font-size:15px;line-height:1.75}.subject-directory-head>span{flex:0 0 auto;color:var(--ink-muted);font:12px/1.4 var(--font-mono);letter-spacing:.14em;text-transform:uppercase}.book-directory-grid{display:grid;gap:18px}.catalog-book{scroll-margin-top:88px;display:grid;gap:16px;padding:22px;border:1px solid var(--paper-edge);background:#fcf9f1a3;transition:border-color .16s ease,background .16s ease,box-shadow .16s ease}.catalog-book:hover,.catalog-book.is-targeted{border-color:var(--ink);background:var(--paper)}.catalog-book.is-targeted{box-shadow:inset 3px 0 0 var(--cinnabar)}.catalog-book-head,.catalog-book-actions,.book-directory summary,.book-section-head{display:flex;align-items:baseline;justify-content:space-between;gap:14px}.catalog-book-head{color:var(--ink-muted);font:11px/1.4 var(--font-mono);letter-spacing:.16em;text-transform:uppercase}.catalog-book-head span:first-child{color:var(--cinnabar)}.catalog-book-main h3{margin:0;color:var(--ink-deep);font-family:var(--font-display);font-size:clamp(28px,3vw,38px);font-weight:500;line-height:1.08}.catalog-book-main .native-title{margin:4px 0 0;color:var(--ink-muted);font:13px/1.5 var(--font-mono);letter-spacing:.14em;text-transform:uppercase}.catalog-book-main p:not(.native-title){max-width:52rem;margin:10px 0 0;color:var(--ink-soft);font-size:15px;line-height:1.8}.book-section-strip{display:flex;flex-wrap:wrap;gap:8px}.book-section-strip span{padding:5px 8px;border:1px solid var(--paper-edge);color:var(--ink-muted);font:12px/1.4 var(--font-body);background:var(--paper-soft)}.catalog-book-actions{justify-content:flex-start;flex-wrap:wrap}.book-directory{border-top:1px dashed var(--paper-edge)}.book-directory summary{padding-top:14px;color:var(--ink);cursor:pointer;list-style:none}.book-directory summary::-webkit-details-marker{display:none}.book-directory summary span:first-child{font-family:var(--font-display);font-size:19px;line-height:1.3}.book-directory summary span:last-child,.book-section-head .section-count{color:var(--ink-muted);font:12px/1.4 var(--font-mono);letter-spacing:.12em;text-transform:uppercase}.book-directory summary:focus-visible{outline:2px solid var(--cinnabar);outline-offset:4px}.book-section-list{display:grid;gap:22px;margin-top:18px}.book-section{display:grid;gap:10px}.book-section-head{padding-bottom:10px;border-bottom:1px solid var(--paper-edge)}.book-section-head h4{flex:1;margin:0;color:var(--ink-deep);font-family:var(--font-display);font-size:22px;font-weight:500;line-height:1.18}.book-unit-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:6px;margin:0;padding:0;list-style:none}.book-unit-list a{display:grid;grid-template-columns:42px minmax(0,1fr);gap:8px 10px;align-items:baseline;min-height:44px;padding:9px 10px;border:1px solid transparent;color:inherit;background:#f5f0e67a}.book-unit-list a:hover{border-color:var(--paper-edge);background:var(--paper-soft)}.book-unit-list strong{min-width:0;color:var(--ink);font-size:14px;font-weight:500;line-height:1.35}.book-unit-list em{grid-column:2;min-width:0;overflow:hidden;color:var(--ink-muted);font:12px/1.45 var(--font-body);font-style:normal;text-overflow:ellipsis;white-space:nowrap}@media(max-width:720px){.map{width:min(100% - 32px,1080px);padding-top:32px}.catalog-search-box{grid-template-columns:1fr}.map-tabs{gap:4px 18px;margin-bottom:28px}.map-tab-title{font-size:17px}.subject-directory-head,.catalog-book-head,.book-directory summary,.book-section-head{align-items:flex-start;flex-direction:column}.catalog-book{padding:18px}.book-unit-list{grid-template-columns:1fr}}