@font-face{font-display:block;font-family:KaTeX_AMS;font-style:normal;font-weight:400;src:url(/assets/KaTeX_AMS-Regular-BQhdFMY1.woff2)format("woff2"),url(/assets/KaTeX_AMS-Regular-DMm9YOAa.woff)format("woff"),url(/assets/KaTeX_AMS-Regular-DRggAlZN.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Caligraphic;font-style:normal;font-weight:700;src:url(/assets/KaTeX_Caligraphic-Bold-Dq_IR9rO.woff2)format("woff2"),url(/assets/KaTeX_Caligraphic-Bold-BEiXGLvX.woff)format("woff"),url(/assets/KaTeX_Caligraphic-Bold-ATXxdsX0.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Caligraphic;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Caligraphic-Regular-Di6jR-x-.woff2)format("woff2"),url(/assets/KaTeX_Caligraphic-Regular-CTRA-rTL.woff)format("woff"),url(/assets/KaTeX_Caligraphic-Regular-wX97UBjC.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Fraktur;font-style:normal;font-weight:700;src:url(/assets/KaTeX_Fraktur-Bold-CL6g_b3V.woff2)format("woff2"),url(/assets/KaTeX_Fraktur-Bold-BsDP51OF.woff)format("woff"),url(/assets/KaTeX_Fraktur-Bold-BdnERNNW.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Fraktur;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Fraktur-Regular-CTYiF6lA.woff2)format("woff2"),url(/assets/KaTeX_Fraktur-Regular-Dxdc4cR9.woff)format("woff"),url(/assets/KaTeX_Fraktur-Regular-CB_wures.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:normal;font-weight:700;src:url(/assets/KaTeX_Main-Bold-Cx986IdX.woff2)format("woff2"),url(/assets/KaTeX_Main-Bold-Jm3AIy58.woff)format("woff"),url(/assets/KaTeX_Main-Bold-waoOVXN0.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:italic;font-weight:700;src:url(/assets/KaTeX_Main-BoldItalic-DxDJ3AOS.woff2)format("woff2"),url(/assets/KaTeX_Main-BoldItalic-SpSLRI95.woff)format("woff"),url(/assets/KaTeX_Main-BoldItalic-DzxPMmG6.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:italic;font-weight:400;src:url(/assets/KaTeX_Main-Italic-NWA7e6Wa.woff2)format("woff2"),url(/assets/KaTeX_Main-Italic-BMLOBm91.woff)format("woff"),url(/assets/KaTeX_Main-Italic-3WenGoN9.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Main-Regular-B22Nviop.woff2)format("woff2"),url(/assets/KaTeX_Main-Regular-Dr94JaBh.woff)format("woff"),url(/assets/KaTeX_Main-Regular-ypZvNtVU.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Math;font-style:italic;font-weight:700;src:url(/assets/KaTeX_Math-BoldItalic-CZnvNsCZ.woff2)format("woff2"),url(/assets/KaTeX_Math-BoldItalic-iY-2wyZ7.woff)format("woff"),url(/assets/KaTeX_Math-BoldItalic-B3XSjfu4.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Math;font-style:italic;font-weight:400;src:url(/assets/KaTeX_Math-Italic-t53AETM-.woff2)format("woff2"),url(/assets/KaTeX_Math-Italic-DA0__PXp.woff)format("woff"),url(/assets/KaTeX_Math-Italic-flOr_0UB.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:normal;font-weight:700;src:url(/assets/KaTeX_SansSerif-Bold-D1sUS0GD.woff2)format("woff2"),url(/assets/KaTeX_SansSerif-Bold-DbIhKOiC.woff)format("woff"),url(/assets/KaTeX_SansSerif-Bold-CFMepnvq.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:italic;font-weight:400;src:url(/assets/KaTeX_SansSerif-Italic-C3H0VqGB.woff2)format("woff2"),url(/assets/KaTeX_SansSerif-Italic-DN2j7dab.woff)format("woff"),url(/assets/KaTeX_SansSerif-Italic-YYjJ1zSn.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:normal;font-weight:400;src:url(/assets/KaTeX_SansSerif-Regular-DDBCnlJ7.woff2)format("woff2"),url(/assets/KaTeX_SansSerif-Regular-CS6fqUqJ.woff)format("woff"),url(/assets/KaTeX_SansSerif-Regular-BNo7hRIc.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Script;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Script-Regular-D3wIWfF6.woff2)format("woff2"),url(/assets/KaTeX_Script-Regular-D5yQViql.woff)format("woff"),url(/assets/KaTeX_Script-Regular-C5JkGWo-.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size1;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Size1-Regular-mCD8mA8B.woff2)format("woff2"),url(/assets/KaTeX_Size1-Regular-C195tn64.woff)format("woff"),url(/assets/KaTeX_Size1-Regular-Dbsnue_I.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size2;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Size2-Regular-Dy4dx90m.woff2)format("woff2"),url(/assets/KaTeX_Size2-Regular-oD1tc_U0.woff)format("woff"),url(/assets/KaTeX_Size2-Regular-B7gKUWhC.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size3;font-style:normal;font-weight:400;src:url(data:font/woff2;base64,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)format("woff2"),url(/assets/KaTeX_Size3-Regular-CTq5MqoE.woff)format("woff"),url(/assets/KaTeX_Size3-Regular-DgpXs0kz.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size4;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Size4-Regular-Dl5lxZxV.woff2)format("woff2"),url(/assets/KaTeX_Size4-Regular-BF-4gkZK.woff)format("woff"),url(/assets/KaTeX_Size4-Regular-DWFBv043.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Typewriter;font-style:normal;font-weight:400;src:url(/assets/KaTeX_Typewriter-Regular-CO6r4hn1.woff2)format("woff2"),url(/assets/KaTeX_Typewriter-Regular-C0xS9mPB.woff)format("woff"),url(/assets/KaTeX_Typewriter-Regular-D3Ib7_Hf.ttf)format("truetype")}.katex{text-indent:0;text-rendering:auto;font:1.21em/1.2 KaTeX_Main,math,Times New Roman,serif;position:relative}.katex *{border-color:currentColor;-ms-high-contrast-adjust:none!important}.katex .katex-version:after{content:"0.19.1"}.katex .katex-mathml{clip-path:inset(50%);border:0;width:1px;height:1px;padding:0;position:absolute;overflow:hidden}.katex .katex-html>.katex-newline{display:block}.katex .katex-base{white-space:nowrap;width:min-content;position:relative}.katex .katex-base,.katex .katex-strut{display:inline-block}.katex .textbf{font-weight:700}.katex .textit{font-style:italic}.katex .textrm{font-family:KaTeX_Main}.katex .textsf{font-family:KaTeX_SansSerif}.katex .texttt{font-family:KaTeX_Typewriter}.katex .mathnormal{font-family:KaTeX_Math;font-style:italic}.katex .mathit{font-family:KaTeX_Main;font-style:italic}.katex .mathrm{font-style:normal}.katex .mathbf{font-family:KaTeX_Main;font-weight:700}.katex .boldsymbol{font-family:KaTeX_Math;font-style:italic;font-weight:700}.katex .amsrm,.katex .mathbb,.katex .textbb{font-family:KaTeX_AMS}.katex .mathcal{font-family:KaTeX_Caligraphic}.katex .mathfrak,.katex .textfrak{font-family:KaTeX_Fraktur}.katex .mathboldfrak,.katex .textboldfrak{font-family:KaTeX_Fraktur;font-weight:700}.katex .mathtt{font-family:KaTeX_Typewriter}.katex .mathscr,.katex .textscr{font-family:KaTeX_Script}.katex .mathsf,.katex .textsf{font-family:KaTeX_SansSerif}.katex .mathboldsf,.katex .textboldsf{font-family:KaTeX_SansSerif;font-weight:700}.katex .mathitsf,.katex .mathsfit,.katex .textitsf{font-family:KaTeX_SansSerif;font-style:italic}.katex .mainrm{font-family:KaTeX_Main;font-style:normal}.katex .vlist-t{border-collapse:collapse;table-layout:fixed;display:inline-table}.katex .vlist-r{display:table-row}.katex .vlist{vertical-align:bottom;display:table-cell;position:relative}.katex .vlist>span{height:0;display:block;position:relative}.katex .vlist>span>span{display:inline-block}.katex .vlist>span>.pstrut{width:0;overflow:hidden}.katex .vlist-t2{margin-right:-2px}.katex .vlist-s{vertical-align:bottom;width:2px;min-width:2px;font-size:1px;display:table-cell}.katex .katex-vbox{flex-direction:column;align-items:baseline;display:inline-flex}.katex .katex-thinbox{flex-direction:row;width:0;max-width:0;display:inline-flex}.katex .msupsub{text-align:left}.katex .mfrac>span>span{text-align:center}.katex .mfrac .frac-line{border-bottom-style:solid;width:100%;display:inline-block}.katex .katex-hdashline,.katex .katex-hline,.katex .katex-overline .overline-line,.katex .katex-rule,.katex .katex-underline .underline-line,.katex .mfrac .frac-line{min-height:1px}.katex .mspace{display:inline-block}.katex .katex-smash{line-height:0;display:inline}.katex .clap,.katex .llap,.katex .rlap{width:0;position:relative}.katex .clap>.katex-inner,.katex .llap>.katex-inner,.katex .rlap>.katex-inner{position:absolute}.katex .clap>.katex-fix,.katex .llap>.katex-fix,.katex .rlap>.katex-fix{display:inline-block}.katex .llap>.katex-inner{right:0}.katex .clap>.katex-inner,.katex .rlap>.katex-inner{left:0}.katex .clap>.katex-inner>span{margin-left:-50%;margin-right:50%}.katex .katex-rule{border:0 solid;display:inline-block;position:relative}.katex .katex-hline,.katex .katex-overline .overline-line,.katex .katex-underline .underline-line{border-bottom-style:solid;width:100%;display:inline-block}.katex .katex-hdashline{border-bottom-style:dashed;width:100%;display:inline-block}.katex .sqrt>.katex-root{margin-left:.277778em;margin-right:-.555556em}.katex .fontsize-ensurer.reset-size1.size1,.katex .katex-sizing.reset-size1.size1{font-size:1em}.katex .fontsize-ensurer.reset-size1.size2,.katex .katex-sizing.reset-size1.size2{font-size:1.2em}.katex .fontsize-ensurer.reset-size1.size3,.katex .katex-sizing.reset-size1.size3{font-size:1.4em}.katex .fontsize-ensurer.reset-size1.size4,.katex .katex-sizing.reset-size1.size4{font-size:1.6em}.katex .fontsize-ensurer.reset-size1.size5,.katex .katex-sizing.reset-size1.size5{font-size:1.8em}.katex .fontsize-ensurer.reset-size1.size6,.katex .katex-sizing.reset-size1.size6{font-size:2em}.katex .fontsize-ensurer.reset-size1.size7,.katex .katex-sizing.reset-size1.size7{font-size:2.4em}.katex .fontsize-ensurer.reset-size1.size8,.katex .katex-sizing.reset-size1.size8{font-size:2.88em}.katex .fontsize-ensurer.reset-size1.size9,.katex .katex-sizing.reset-size1.size9{font-size:3.456em}.katex .fontsize-ensurer.reset-size1.size10,.katex .katex-sizing.reset-size1.size10{font-size:4.148em}.katex .fontsize-ensurer.reset-size1.size11,.katex .katex-sizing.reset-size1.size11{font-size:4.976em}.katex .fontsize-ensurer.reset-size2.size1,.katex .katex-sizing.reset-size2.size1{font-size:.833333em}.katex .fontsize-ensurer.reset-size2.size2,.katex .katex-sizing.reset-size2.size2{font-size:1em}.katex .fontsize-ensurer.reset-size2.size3,.katex .katex-sizing.reset-size2.size3{font-size:1.16667em}.katex .fontsize-ensurer.reset-size2.size4,.katex .katex-sizing.reset-size2.size4{font-size:1.33333em}.katex .fontsize-ensurer.reset-size2.size5,.katex .katex-sizing.reset-size2.size5{font-size:1.5em}.katex .fontsize-ensurer.reset-size2.size6,.katex .katex-sizing.reset-size2.size6{font-size:1.66667em}.katex .fontsize-ensurer.reset-size2.size7,.katex .katex-sizing.reset-size2.size7{font-size:2em}.katex .fontsize-ensurer.reset-size2.size8,.katex .katex-sizing.reset-size2.size8{font-size:2.4em}.katex .fontsize-ensurer.reset-size2.size9,.katex .katex-sizing.reset-size2.size9{font-size:2.88em}.katex .fontsize-ensurer.reset-size2.size10,.katex .katex-sizing.reset-size2.size10{font-size:3.45667em}.katex .fontsize-ensurer.reset-size2.size11,.katex .katex-sizing.reset-size2.size11{font-size:4.14667em}.katex .fontsize-ensurer.reset-size3.size1,.katex .katex-sizing.reset-size3.size1{font-size:.714286em}.katex .fontsize-ensurer.reset-size3.size2,.katex .katex-sizing.reset-size3.size2{font-size:.857143em}.katex .fontsize-ensurer.reset-size3.size3,.katex .katex-sizing.reset-size3.size3{font-size:1em}.katex .fontsize-ensurer.reset-size3.size4,.katex .katex-sizing.reset-size3.size4{font-size:1.14286em}.katex .fontsize-ensurer.reset-size3.size5,.katex .katex-sizing.reset-size3.size5{font-size:1.28571em}.katex .fontsize-ensurer.reset-size3.size6,.katex .katex-sizing.reset-size3.size6{font-size:1.42857em}.katex .fontsize-ensurer.reset-size3.size7,.katex .katex-sizing.reset-size3.size7{font-size:1.71429em}.katex .fontsize-ensurer.reset-size3.size8,.katex .katex-sizing.reset-size3.size8{font-size:2.05714em}.katex .fontsize-ensurer.reset-size3.size9,.katex .katex-sizing.reset-size3.size9{font-size:2.46857em}.katex .fontsize-ensurer.reset-size3.size10,.katex .katex-sizing.reset-size3.size10{font-size:2.96286em}.katex .fontsize-ensurer.reset-size3.size11,.katex .katex-sizing.reset-size3.size11{font-size:3.55429em}.katex .fontsize-ensurer.reset-size4.size1,.katex .katex-sizing.reset-size4.size1{font-size:.625em}.katex .fontsize-ensurer.reset-size4.size2,.katex .katex-sizing.reset-size4.size2{font-size:.75em}.katex .fontsize-ensurer.reset-size4.size3,.katex .katex-sizing.reset-size4.size3{font-size:.875em}.katex .fontsize-ensurer.reset-size4.size4,.katex .katex-sizing.reset-size4.size4{font-size:1em}.katex .fontsize-ensurer.reset-size4.size5,.katex .katex-sizing.reset-size4.size5{font-size:1.125em}.katex .fontsize-ensurer.reset-size4.size6,.katex .katex-sizing.reset-size4.size6{font-size:1.25em}.katex .fontsize-ensurer.reset-size4.size7,.katex .katex-sizing.reset-size4.size7{font-size:1.5em}.katex .fontsize-ensurer.reset-size4.size8,.katex .katex-sizing.reset-size4.size8{font-size:1.8em}.katex .fontsize-ensurer.reset-size4.size9,.katex .katex-sizing.reset-size4.size9{font-size:2.16em}.katex .fontsize-ensurer.reset-size4.size10,.katex .katex-sizing.reset-size4.size10{font-size:2.5925em}.katex .fontsize-ensurer.reset-size4.size11,.katex .katex-sizing.reset-size4.size11{font-size:3.11em}.katex .fontsize-ensurer.reset-size5.size1,.katex .katex-sizing.reset-size5.size1{font-size:.555556em}.katex .fontsize-ensurer.reset-size5.size2,.katex .katex-sizing.reset-size5.size2{font-size:.666667em}.katex .fontsize-ensurer.reset-size5.size3,.katex .katex-sizing.reset-size5.size3{font-size:.777778em}.katex .fontsize-ensurer.reset-size5.size4,.katex .katex-sizing.reset-size5.size4{font-size:.888889em}.katex .fontsize-ensurer.reset-size5.size5,.katex .katex-sizing.reset-size5.size5{font-size:1em}.katex .fontsize-ensurer.reset-size5.size6,.katex .katex-sizing.reset-size5.size6{font-size:1.11111em}.katex .fontsize-ensurer.reset-size5.size7,.katex .katex-sizing.reset-size5.size7{font-size:1.33333em}.katex .fontsize-ensurer.reset-size5.size8,.katex .katex-sizing.reset-size5.size8{font-size:1.6em}.katex .fontsize-ensurer.reset-size5.size9,.katex .katex-sizing.reset-size5.size9{font-size:1.92em}.katex .fontsize-ensurer.reset-size5.size10,.katex .katex-sizing.reset-size5.size10{font-size:2.30444em}.katex .fontsize-ensurer.reset-size5.size11,.katex .katex-sizing.reset-size5.size11{font-size:2.76444em}.katex .fontsize-ensurer.reset-size6.size1,.katex .katex-sizing.reset-size6.size1{font-size:.5em}.katex .fontsize-ensurer.reset-size6.size2,.katex .katex-sizing.reset-size6.size2{font-size:.6em}.katex .fontsize-ensurer.reset-size6.size3,.katex .katex-sizing.reset-size6.size3{font-size:.7em}.katex .fontsize-ensurer.reset-size6.size4,.katex .katex-sizing.reset-size6.size4{font-size:.8em}.katex .fontsize-ensurer.reset-size6.size5,.katex .katex-sizing.reset-size6.size5{font-size:.9em}.katex .fontsize-ensurer.reset-size6.size6,.katex .katex-sizing.reset-size6.size6{font-size:1em}.katex .fontsize-ensurer.reset-size6.size7,.katex .katex-sizing.reset-size6.size7{font-size:1.2em}.katex .fontsize-ensurer.reset-size6.size8,.katex .katex-sizing.reset-size6.size8{font-size:1.44em}.katex .fontsize-ensurer.reset-size6.size9,.katex .katex-sizing.reset-size6.size9{font-size:1.728em}.katex .fontsize-ensurer.reset-size6.size10,.katex .katex-sizing.reset-size6.size10{font-size:2.074em}.katex .fontsize-ensurer.reset-size6.size11,.katex .katex-sizing.reset-size6.size11{font-size:2.488em}.katex .fontsize-ensurer.reset-size7.size1,.katex .katex-sizing.reset-size7.size1{font-size:.416667em}.katex .fontsize-ensurer.reset-size7.size2,.katex .katex-sizing.reset-size7.size2{font-size:.5em}.katex .fontsize-ensurer.reset-size7.size3,.katex .katex-sizing.reset-size7.size3{font-size:.583333em}.katex .fontsize-ensurer.reset-size7.size4,.katex .katex-sizing.reset-size7.size4{font-size:.666667em}.katex .fontsize-ensurer.reset-size7.size5,.katex .katex-sizing.reset-size7.size5{font-size:.75em}.katex .fontsize-ensurer.reset-size7.size6,.katex .katex-sizing.reset-size7.size6{font-size:.833333em}.katex .fontsize-ensurer.reset-size7.size7,.katex .katex-sizing.reset-size7.size7{font-size:1em}.katex .fontsize-ensurer.reset-size7.size8,.katex .katex-sizing.reset-size7.size8{font-size:1.2em}.katex .fontsize-ensurer.reset-size7.size9,.katex .katex-sizing.reset-size7.size9{font-size:1.44em}.katex .fontsize-ensurer.reset-size7.size10,.katex .katex-sizing.reset-size7.size10{font-size:1.72833em}.katex .fontsize-ensurer.reset-size7.size11,.katex .katex-sizing.reset-size7.size11{font-size:2.07333em}.katex .fontsize-ensurer.reset-size8.size1,.katex .katex-sizing.reset-size8.size1{font-size:.347222em}.katex .fontsize-ensurer.reset-size8.size2,.katex .katex-sizing.reset-size8.size2{font-size:.416667em}.katex .fontsize-ensurer.reset-size8.size3,.katex .katex-sizing.reset-size8.size3{font-size:.486111em}.katex .fontsize-ensurer.reset-size8.size4,.katex .katex-sizing.reset-size8.size4{font-size:.555556em}.katex .fontsize-ensurer.reset-size8.size5,.katex .katex-sizing.reset-size8.size5{font-size:.625em}.katex .fontsize-ensurer.reset-size8.size6,.katex .katex-sizing.reset-size8.size6{font-size:.694444em}.katex .fontsize-ensurer.reset-size8.size7,.katex .katex-sizing.reset-size8.size7{font-size:.833333em}.katex .fontsize-ensurer.reset-size8.size8,.katex .katex-sizing.reset-size8.size8{font-size:1em}.katex .fontsize-ensurer.reset-size8.size9,.katex .katex-sizing.reset-size8.size9{font-size:1.2em}.katex .fontsize-ensurer.reset-size8.size10,.katex .katex-sizing.reset-size8.size10{font-size:1.44028em}.katex .fontsize-ensurer.reset-size8.size11,.katex .katex-sizing.reset-size8.size11{font-size:1.72778em}.katex .fontsize-ensurer.reset-size9.size1,.katex .katex-sizing.reset-size9.size1{font-size:.289352em}.katex .fontsize-ensurer.reset-size9.size2,.katex .katex-sizing.reset-size9.size2{font-size:.347222em}.katex .fontsize-ensurer.reset-size9.size3,.katex .katex-sizing.reset-size9.size3{font-size:.405093em}.katex .fontsize-ensurer.reset-size9.size4,.katex .katex-sizing.reset-size9.size4{font-size:.462963em}.katex .fontsize-ensurer.reset-size9.size5,.katex .katex-sizing.reset-size9.size5{font-size:.520833em}.katex .fontsize-ensurer.reset-size9.size6,.katex .katex-sizing.reset-size9.size6{font-size:.578704em}.katex .fontsize-ensurer.reset-size9.size7,.katex .katex-sizing.reset-size9.size7{font-size:.694444em}.katex .fontsize-ensurer.reset-size9.size8,.katex .katex-sizing.reset-size9.size8{font-size:.833333em}.katex .fontsize-ensurer.reset-size9.size9,.katex .katex-sizing.reset-size9.size9{font-size:1em}.katex .fontsize-ensurer.reset-size9.size10,.katex .katex-sizing.reset-size9.size10{font-size:1.20023em}.katex .fontsize-ensurer.reset-size9.size11,.katex .katex-sizing.reset-size9.size11{font-size:1.43981em}.katex .fontsize-ensurer.reset-size10.size1,.katex .katex-sizing.reset-size10.size1{font-size:.24108em}.katex .fontsize-ensurer.reset-size10.size2,.katex .katex-sizing.reset-size10.size2{font-size:.289296em}.katex .fontsize-ensurer.reset-size10.size3,.katex .katex-sizing.reset-size10.size3{font-size:.337512em}.katex .fontsize-ensurer.reset-size10.size4,.katex .katex-sizing.reset-size10.size4{font-size:.385728em}.katex .fontsize-ensurer.reset-size10.size5,.katex .katex-sizing.reset-size10.size5{font-size:.433944em}.katex .fontsize-ensurer.reset-size10.size6,.katex .katex-sizing.reset-size10.size6{font-size:.48216em}.katex .fontsize-ensurer.reset-size10.size7,.katex .katex-sizing.reset-size10.size7{font-size:.578592em}.katex .fontsize-ensurer.reset-size10.size8,.katex .katex-sizing.reset-size10.size8{font-size:.694311em}.katex .fontsize-ensurer.reset-size10.size9,.katex .katex-sizing.reset-size10.size9{font-size:.833173em}.katex .fontsize-ensurer.reset-size10.size10,.katex .katex-sizing.reset-size10.size10{font-size:1em}.katex .fontsize-ensurer.reset-size10.size11,.katex .katex-sizing.reset-size10.size11{font-size:1.19961em}.katex .fontsize-ensurer.reset-size11.size1,.katex .katex-sizing.reset-size11.size1{font-size:.200965em}.katex .fontsize-ensurer.reset-size11.size2,.katex .katex-sizing.reset-size11.size2{font-size:.241158em}.katex .fontsize-ensurer.reset-size11.size3,.katex .katex-sizing.reset-size11.size3{font-size:.281351em}.katex .fontsize-ensurer.reset-size11.size4,.katex .katex-sizing.reset-size11.size4{font-size:.321543em}.katex .fontsize-ensurer.reset-size11.size5,.katex .katex-sizing.reset-size11.size5{font-size:.361736em}.katex .fontsize-ensurer.reset-size11.size6,.katex .katex-sizing.reset-size11.size6{font-size:.401929em}.katex .fontsize-ensurer.reset-size11.size7,.katex .katex-sizing.reset-size11.size7{font-size:.482315em}.katex .fontsize-ensurer.reset-size11.size8,.katex .katex-sizing.reset-size11.size8{font-size:.578778em}.katex .fontsize-ensurer.reset-size11.size9,.katex .katex-sizing.reset-size11.size9{font-size:.694534em}.katex .fontsize-ensurer.reset-size11.size10,.katex .katex-sizing.reset-size11.size10{font-size:.833601em}.katex .fontsize-ensurer.reset-size11.size11,.katex .katex-sizing.reset-size11.size11{font-size:1em}.katex .delimsizing.size1{font-family:KaTeX_Size1}.katex .delimsizing.size2{font-family:KaTeX_Size2}.katex .delimsizing.size3{font-family:KaTeX_Size3}.katex .delimsizing.size4{font-family:KaTeX_Size4}.katex .delimsizing.mult .delim-size1>span{font-family:KaTeX_Size1}.katex .delimsizing.mult .delim-size4>span{font-family:KaTeX_Size4}.katex .nulldelimiter{width:.12em;display:inline-block}.katex .delimcenter,.katex .op-symbol{position:relative}.katex .op-symbol.small-op{font-family:KaTeX_Size1}.katex .op-symbol.large-op{font-family:KaTeX_Size2}.katex .katex-accent>.vlist-t,.katex .op-limits>.vlist-t{text-align:center}.katex .katex-accent .accent-body{position:relative}.katex .katex-accent .accent-body:not(.accent-full){width:0}.katex .katex-overlay{display:block}.katex .mtable .vertical-separator{min-width:1px;display:inline-block}.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;height:inherit;width:100%;display:block;position:absolute}.katex svg path{stroke:none}.katex svg{fill-rule:nonzero;fill-opacity:1;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1}.katex img{border-style:none;min-width:0;max-width:none;min-height:0;max-height:none}.katex .katex-stretchy{width:100%;display:block;position:relative;overflow:hidden}.katex .katex-stretchy:after,.katex .katex-stretchy:before{content:""}.katex .hide-tail{width:100%;position:relative;overflow:hidden}.katex .halfarrow-left{width:50.2%;position:absolute;left:0;overflow:hidden}.katex .halfarrow-right{width:50.2%;position:absolute;right:0;overflow:hidden}.katex .brace-left{width:25.1%;position:absolute;left:0;overflow:hidden}.katex .brace-center{width:50%;position:absolute;left:25%;overflow:hidden}.katex .brace-right{width:25.1%;position:absolute;right:0;overflow:hidden}.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{box-sizing:border-box;border:.04em solid}.katex .cancel-pad{padding:0 .2em}.katex .cancel-lap{margin-left:-.2em;margin-right:-.2em}.katex .katex-sout{border-bottom-style:solid;border-bottom-width:.08em}.katex .angl{box-sizing:border-box;border-top:.049em solid;border-right:.049em solid;margin-right:.03889em}.katex .anglpad{padding:0 .03889em}.katex .reflectbox{display:inline-block;transform:scaleX(-1)}.katex .eqn-num:before{content:"(" counter(katexEqnNo) ")";counter-increment:katexEqnNo}.katex .mml-eqn-num:before{content:"(" counter(mmlEqnNo) ")";counter-increment:mmlEqnNo}.katex .mtr-glue{width:50%}.katex .cd-vert-arrow{display:inline-block;position:relative}.katex .cd-label-left{text-align:left;display:inline-block;position:absolute;right:calc(50% + .3em)}.katex .cd-label-right{text-align:right;display:inline-block;position:absolute;left:calc(50% + .3em)}.katex-display{text-align:center;margin:1em 0;display:block}.katex-display>.katex{text-align:center;white-space:nowrap;display:block}.katex-display>.katex>.katex-html{display:block;position:relative}.katex-display>.katex>.katex-html>.katex-tag{position:absolute;right:0}.katex-display.leqno>.katex>.katex-html>.katex-tag{left:0;right:auto}.katex-display.fleqn>.katex{text-align:left;padding-left:2em}body{counter-reset:katexEqnNo mmlEqnNo}:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--paper:#f4f1e8;--paper-deep:#ebe5d6;--ink:#141414;--muted:#5c5a52;--cobalt:#1f3a8a;--copper:#b45309;--acid:#2f6b4f;--hazard:#b42318;--rule:#d8d2c4;--surface:#fffdf7;--surface-2:#f8f4e9;--radius:14px;--shadow:4px 4px 0 #14141414;--font-display:"Instrument Serif", Georgia, "Times New Roman", serif;--font-ui:"IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;--font-mono:"IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;--rule-width:1.5px;--rule-strong:2px;--paper-lines:#1414140b;--shadow-hard:3px 3px 0 #14141429;--page-max:1180px;--measure:64ch;--gutter:clamp(1rem, 4vw, 2.5rem);--space-xs:6px;--space-sm:12px;--space-md:20px;--space-lg:32px;--space-xl:56px;--ease:cubic-bezier(.22, .61, .36, 1)}:root[data-theme=dark]{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--paper:#121212;--paper-deep:#1b1b1b;--ink:#f2eee4;--muted:#b7b0a3;--cobalt:#8ba3ff;--copper:#f2b544;--acid:#7bc59a;--hazard:#ff8a80;--rule:#33312c;--surface:#1a1a18;--surface-2:#22211e;--shadow:4px 4px 0 #00000059;--paper-lines:#f2eee40d;--shadow-hard:3px 3px 0 #0000008c}@font-face{font-family:Instrument Serif;font-style:normal;font-display:swap;font-weight:400;src:url(/assets/instrument-serif-latin-400-normal-DnYpCC2O.woff2)format("woff2"),url(/assets/instrument-serif-latin-400-normal-BVbkICAY.woff)format("woff")}@font-face{font-family:IBM Plex Sans;font-style:normal;font-display:swap;font-weight:400;src:url(/assets/ibm-plex-sans-latin-400-normal-CDDApCn2.woff2)format("woff2"),url(/assets/ibm-plex-sans-latin-400-normal-CYLoc0-x.woff)format("woff")}@font-face{font-family:IBM Plex Sans;font-style:normal;font-display:swap;font-weight:500;src:url(/assets/ibm-plex-sans-latin-500-normal-6ng42L7E.woff2)format("woff2"),url(/assets/ibm-plex-sans-latin-500-normal-BgVn5rGT.woff)format("woff")}@font-face{font-family:IBM Plex Sans;font-style:normal;font-display:swap;font-weight:600;src:url(/assets/ibm-plex-sans-latin-600-normal-CuJfVYMP.woff2)format("woff2"),url(/assets/ibm-plex-sans-latin-600-normal-Cu4Hd6ag.woff)format("woff")}@font-face{font-family:IBM Plex Mono;font-style:normal;font-display:swap;font-weight:400;src:url(/assets/ibm-plex-mono-latin-400-normal-DMJ8VG8y.woff2)format("woff2"),url(/assets/ibm-plex-mono-latin-400-normal-CvHOgSBP.woff)format("woff")}@font-face{font-family:IBM Plex Mono;font-style:normal;font-display:swap;font-weight:500;src:url(/assets/ibm-plex-mono-latin-500-normal-DSY6xOcd.woff2)format("woff2"),url(/assets/ibm-plex-mono-latin-500-normal-CB9ihrfo.woff)format("woff")}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;-moz-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}body{background-color:var(--paper);min-height:100vh;color:var(--ink);font-family:var(--font-ui);font-synthesis-weight:none;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;margin:0;font-size:1rem;line-height:1.6;overflow-x:clip}body:before{content:"";z-index:0;pointer-events:none;background-image:repeating-linear-gradient(to bottom, var(--paper-lines) 0 1px, transparent 1px 32px);position:fixed;inset:0}h1,h2,h3,h4{font-family:var(--font-display);letter-spacing:-.012em;text-wrap:balance;margin:0;font-weight:400;line-height:1.04}p{margin:0}a{color:var(--cobalt);text-underline-offset:3px;text-decoration-line:underline;text-decoration-thickness:1.5px;-webkit-text-decoration-color:color-mix(in srgb, currentColor 45%, transparent);text-decoration-color:color-mix(in srgb, currentColor 45%, transparent);transition:color .12s var(--ease), text-decoration-color .12s var(--ease)}a:hover{color:var(--copper);text-decoration-color:currentColor}:where(a,button,[tabindex]):focus-visible{outline:2.5px solid var(--cobalt);outline-offset:3px;border-radius:3px}:root[data-theme=dark] :where(a,button,[tabindex]):focus-visible{outline-color:var(--copper)}::selection{background:var(--cobalt);color:var(--paper)}:root[data-theme=dark] ::selection{background:var(--copper);color:#141414}img,svg{max-width:100%;display:block}button{font:inherit;color:inherit}.sr-only{clip-path:inset(50%);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,:before,:after{transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}.site{z-index:1;flex-direction:column;min-height:100dvh;display:flex;position:relative}.skip-link{z-index:200;background:var(--ink);color:var(--paper);border:2px solid var(--ink);font-family:var(--font-mono);letter-spacing:.09em;text-transform:uppercase;transition:transform .14s var(--ease);border-radius:6px;padding:9px 14px;font-size:11.5px;text-decoration:none;position:fixed;top:10px;left:12px;transform:translateY(-180%)}.skip-link:focus,.skip-link:focus-visible{color:var(--paper);outline-color:var(--copper);transform:translateY(0)}.site-header{z-index:60;padding:10px var(--gutter) 0;padding-inline:max(var(--gutter), calc((100% - var(--page-max)) / 2 + var(--gutter)));background:var(--paper);border-bottom:var(--rule-strong) solid var(--ink);grid-template-columns:auto minmax(0,1fr) auto;grid-template-areas:"brand nav tools";align-items:end;gap:0 clamp(14px,2.4vw,30px);display:grid;position:sticky;top:0}.brand-link{color:var(--ink);grid-area:brand;align-self:center;padding-block:8px 12px;text-decoration:none}.brand-link:hover{color:var(--ink)}.brand{align-items:center;gap:11px;display:inline-flex}.brand-mark{width:34px;height:36px;color:var(--cobalt);transition:color .14s var(--ease), transform .14s var(--ease);flex:none}.brand-link:hover .brand-mark{color:var(--copper);transform:rotate(-4deg)}.brand-mark-ring{fill:none;stroke:currentColor;stroke-width:2.2px;stroke-linejoin:round}.brand-mark-core{fill:none;stroke:var(--copper);stroke-width:2.2px}.brand-mark-tick{stroke:var(--copper);stroke-width:2.2px;stroke-linecap:round}.brand-text{flex-direction:column;gap:3px;display:flex}.brand-name{font-family:var(--font-display);letter-spacing:-.02em;font-size:1.7rem;line-height:.92}.brand-sub{font-family:var(--font-mono);letter-spacing:.18em;text-transform:uppercase;color:var(--muted);white-space:nowrap;font-size:9.5px;font-weight:500}.site-nav{max-width:100%;margin-bottom:calc(-1 * var(--rule-strong));grid-area:nav;justify-self:end;align-items:stretch;gap:2px;display:flex}.site-nav a{border:var(--rule-width) solid transparent;border-bottom:var(--rule-strong) solid transparent;min-height:42px;color:var(--muted);font-family:var(--font-mono);letter-spacing:.09em;text-transform:uppercase;white-space:nowrap;transition:background-color .12s var(--ease), color .12s var(--ease), border-color .12s var(--ease);border-radius:7px 7px 0 0;align-items:center;padding:0 13px;font-size:11.5px;font-weight:500;text-decoration:none;display:inline-flex}.site-nav a:hover{color:var(--ink);background:var(--surface-2);border-color:var(--rule);border-bottom-color:#0000}.site-nav a[aria-current=page]{color:var(--ink);background:var(--surface);border-color:var(--ink);border-bottom-color:var(--surface);box-shadow:inset 0 3px 0 var(--copper)}.header-tools{grid-area:tools;align-self:center;align-items:center;gap:clamp(8px,1.4vw,16px);padding-block:8px 10px;display:flex}.nav-more{border-bottom:2px solid color-mix(in srgb, var(--copper) 45%, transparent);color:var(--copper);font-family:var(--font-mono);letter-spacing:.09em;text-transform:uppercase;white-space:nowrap;transition:border-color .12s var(--ease), color .12s var(--ease);padding:5px 1px;font-size:11.5px;font-weight:500;text-decoration:none}.nav-more:hover,.nav-more[aria-current=page]{color:var(--copper);border-bottom-color:var(--copper)}.theme-toggle{background:var(--surface);width:42px;height:42px;color:var(--ink);border:var(--rule-width) solid var(--ink);box-shadow:var(--shadow-hard);cursor:pointer;transition:transform .12s var(--ease), box-shadow .12s var(--ease), background-color .12s var(--ease), color .12s var(--ease);border-radius:7px;place-items:center;padding:0;display:inline-grid}.theme-toggle svg{width:19px;height:19px}.theme-toggle:hover{background:var(--surface-2);color:var(--copper);box-shadow:4px 4px 0 color-mix(in srgb, var(--ink) 22%, transparent);transform:translate(-1px,-1px)}.theme-toggle:active{box-shadow:1px 1px 0 color-mix(in srgb, var(--ink) 22%, transparent);transform:translate(2px,2px)}.site-main{width:100%;max-width:var(--page-max);padding:clamp(28px, 5vw, 60px) var(--gutter) clamp(48px, 7vw, 96px);flex:1;margin-inline:auto}.site-footer{border-top:var(--rule-strong) solid var(--ink);background:var(--surface-2);padding:22px var(--gutter) 28px}.footer-inner{max-width:var(--page-max);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px 32px;margin-inline:auto;display:flex}.footer-copy{flex-direction:column;gap:6px;display:flex}.footer-copy p{max-width:68ch;color:var(--muted);font-family:var(--font-mono);letter-spacing:.015em;font-size:11.5px;line-height:1.65}.footer-copy a{color:var(--ink);text-decoration-thickness:2px;-webkit-text-decoration-color:var(--copper);text-decoration-color:var(--copper);text-underline-offset:4px}.footer-copy a:hover{color:var(--copper)}.footer-stamp{border:var(--rule-width) dashed var(--copper);color:var(--copper);font-family:var(--font-mono);letter-spacing:.18em;text-transform:uppercase;border-radius:5px;gap:2px;padding:6px 10px 5px;font-size:10px;font-weight:500;line-height:1.25;display:grid;transform:rotate(-2deg)}.footer-stamp span{color:var(--muted);letter-spacing:.13em;font-size:8.5px}.rich-text{font-family:inherit;font-size:inherit;line-height:inherit}.rich-text sub,.rich-text sup{font-size:.72em;line-height:0}.tex{font-family:var(--font-display);font-size:1em;line-height:1.2;display:inline}.tex .katex{font-size:1em}.tex-display{display:block}.math-block{max-width:100%;margin-block:var(--space-sm);font-family:var(--font-display);text-align:center;padding-block:2px;display:block;overflow:auto hidden}.math-block .katex-display{margin:0}.choice-list{gap:10px;display:grid}.choice{grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:8px;display:grid}.choice-card{background:var(--surface);width:100%;min-height:48px;color:var(--ink);border:1.5px solid var(--rule);font-family:var(--font-ui);text-align:left;cursor:pointer;transition:border-color .12s var(--ease), background-color .12s var(--ease);border-radius:12px;align-items:flex-start;gap:12px;padding:12px 14px;font-size:1rem;line-height:1.5;display:flex}.choice-card:hover:not(:disabled){border-color:var(--cobalt)}.choice-card:disabled{cursor:default}.choice-card:focus-visible{outline:2px solid var(--cobalt);outline-offset:-3px;border-radius:12px}.choice-letter{background:var(--surface-2);width:24px;height:24px;color:var(--muted);border:1.5px solid var(--rule);font-family:var(--font-mono);transition:background-color .12s var(--ease), border-color .12s var(--ease), color .12s var(--ease);border-radius:6px;flex:none;place-items:center;font-size:12px;line-height:1;display:inline-grid}.choice-body{flex:1;min-width:0}.choice.is-picked .choice-card{border:2px solid var(--cobalt);background:color-mix(in srgb, var(--cobalt) 9%, var(--surface))}.choice.is-picked .choice-letter{border-color:var(--cobalt);color:var(--cobalt)}.choice.is-right .choice-card{border:2px solid var(--acid);background:color-mix(in srgb, var(--acid) 10%, var(--surface))}.choice.is-right .choice-letter{background:var(--acid);border-color:var(--acid);color:var(--surface)}.choice.is-wrong .choice-card{border:2px solid var(--hazard);background:color-mix(in srgb, var(--hazard) 10%, var(--surface))}.choice.is-wrong .choice-letter{background:var(--hazard);border-color:var(--hazard);color:var(--surface)}.choice-strike{min-width:44px;min-height:44px;color:var(--muted);font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;cursor:pointer;transition:color .12s var(--ease), border-color .12s var(--ease);background:0 0;border:1.5px solid #0000;border-radius:8px;padding:0 8px;font-size:11px;font-weight:500;line-height:1.2}.choice-strike:hover:not(:disabled){color:var(--ink);border-color:var(--rule)}.choice-strike[aria-pressed=true]{color:var(--copper);border-color:color-mix(in srgb, var(--copper) 45%, transparent)}.choice-strike:disabled{cursor:default;opacity:.45}.choice-strike:focus-visible{outline:2px solid var(--cobalt);outline-offset:2px}.choice.is-struck .choice-body{opacity:.55;text-decoration:line-through;text-decoration-thickness:1.5px}.choice:has(.choice-strike[aria-pressed=true]) .choice-body{opacity:.55;text-decoration:line-through;text-decoration-thickness:1.5px}.badge{background:var(--surface-2);color:var(--muted);border:1px solid var(--rule);font-family:var(--font-mono);letter-spacing:.06em;text-transform:uppercase;white-space:nowrap;vertical-align:middle;border-radius:999px;align-items:center;gap:5px;padding:2px 8px;font-size:10.5px;font-weight:500;line-height:1.5;display:inline-flex}.badge .icon{width:13px;height:13px}.badge[data-domain=general]{color:var(--cobalt);border-color:color-mix(in srgb, var(--cobalt) 35%, var(--rule));background:color-mix(in srgb, var(--cobalt) 7%, var(--surface-2))}.badge[data-domain=physical]{color:var(--copper);border-color:color-mix(in srgb, var(--copper) 35%, var(--rule));background:color-mix(in srgb, var(--copper) 8%, var(--surface-2))}.badge[data-domain=analytical]{color:var(--acid);border-color:color-mix(in srgb, var(--acid) 35%, var(--rule));background:color-mix(in srgb, var(--acid) 8%, var(--surface-2))}.badge[data-domain=organic]{color:var(--hazard);border-color:color-mix(in srgb, var(--hazard) 32%, var(--rule));background:color-mix(in srgb, var(--hazard) 7%, var(--surface-2))}.badge[data-domain=laboratory]{color:var(--ink);border-color:color-mix(in srgb, var(--ink) 30%, var(--rule))}.badge[data-difficulty=foundation]{color:var(--acid);border-color:color-mix(in srgb, var(--acid) 35%, var(--rule))}.badge[data-difficulty=standard]{color:var(--cobalt);border-color:color-mix(in srgb, var(--cobalt) 32%, var(--rule))}.badge[data-difficulty=olympiad]{color:var(--copper);border-color:color-mix(in srgb, var(--copper) 40%, var(--rule))}.badge[data-status=verified]{color:var(--acid);border-color:color-mix(in srgb, var(--acid) 35%, var(--rule));background:color-mix(in srgb, var(--acid) 8%, var(--surface-2))}.badge[data-status=flagged]{color:var(--hazard);border-color:color-mix(in srgb, var(--hazard) 35%, var(--rule));background:color-mix(in srgb, var(--hazard) 8%, var(--surface-2))}.section-head{margin-block:var(--space-xl) var(--space-md);grid-template-columns:minmax(0,1fr) auto;grid-template-areas:"eyebrow actions""title actions""lede actions";align-items:end;gap:6px 24px;display:grid}.section-eyebrow{color:var(--copper);font-family:var(--font-mono);letter-spacing:.16em;text-transform:uppercase;grid-area:eyebrow;align-items:center;gap:10px;font-size:11px;font-weight:500;display:flex}.section-eyebrow:before{content:"";width:26px;height:var(--rule-width);background:currentColor;flex:none}.section-head h2{font-family:var(--font-display);grid-area:title;font-size:clamp(1.7rem,3.6vw,2.4rem)}.section-lede{max-width:60ch;color:var(--muted);grid-area:lede;font-size:1.02rem;line-height:1.55}.section-actions{flex-wrap:wrap;grid-area:actions;justify-content:flex-end;place-self:end;gap:8px;display:flex}.bar{background:var(--surface-2);border:1px solid var(--rule);border-radius:999px;width:100%;height:8px;overflow:hidden}.bar-fill{background:var(--cobalt);border-radius:inherit;height:100%;transition:width .24s var(--ease);display:block}.bar[data-tone=cobalt] .bar-fill{background:var(--cobalt)}.bar[data-tone=acid] .bar-fill{background:var(--acid)}.bar[data-tone=copper] .bar-fill{background:var(--copper)}.bar[data-tone=hazard] .bar-fill{background:var(--hazard)}.progress-ring{color:var(--cobalt);place-items:center;display:inline-grid}.progress-ring>*{grid-area:1/1}.progress-ring svg{transform:rotate(-90deg)}.progress-ring-track{stroke:var(--rule)}.progress-ring-fill{stroke:currentColor}.progress-ring-value{color:var(--ink);font-family:var(--font-mono);letter-spacing:.02em;font-size:12px;font-weight:500}.progress-ring[data-tone=acid]{color:var(--acid)}.progress-ring[data-tone=copper]{color:var(--copper)}.progress-ring[data-tone=hazard]{color:var(--hazard)}.icon{vertical-align:-.15em;flex:none;display:inline-block}@media (max-width:700px){.section-head{grid-template-columns:minmax(0,1fr);grid-template-areas:"eyebrow""title""lede""actions"}.section-actions{justify-content:flex-start;justify-self:start}}@media (prefers-reduced-motion:reduce){.choice-card,.choice-letter,.choice-strike,.bar-fill{transition:none}}.page{max-width:var(--measure)}.page-eyebrow{color:var(--copper);font-family:var(--font-mono);letter-spacing:.16em;text-transform:uppercase;align-items:center;gap:10px;margin-bottom:16px;font-size:11px;font-weight:500;display:flex}.page-eyebrow:before{content:"";width:26px;height:var(--rule-width);background:currentColor}.page h1{max-width:18ch;font-size:clamp(2.6rem,6.4vw,4.25rem)}.page-lede{max-width:52ch;color:var(--muted);margin-top:18px;font-size:clamp(1.05rem,1.6vw,1.25rem);line-height:1.55}.page-note{background:var(--surface);border:var(--rule-width) solid var(--rule);border-left:5px solid var(--cobalt);box-shadow:var(--shadow);color:var(--muted);font-family:var(--font-mono);letter-spacing:.01em;border-radius:0 10px 10px 0;margin-top:34px;padding:15px 18px;font-size:12px;line-height:1.7}@media (max-width:560px){.page-note{margin-top:28px}}.home{max-width:var(--page-max);grid-template-columns:minmax(0,1fr);margin-inline:auto;display:grid}html{scrollbar-width:thin;scrollbar-color:var(--copper) var(--paper-deep)}html::-webkit-scrollbar{width:10px}html::-webkit-scrollbar-track{background:var(--paper-deep)}html::-webkit-scrollbar-thumb{background:color-mix(in srgb, var(--copper) 62%, var(--paper-deep));border:2px solid var(--paper-deep);border-radius:8px}html::-webkit-scrollbar-thumb:hover{background:var(--copper)}.sample-card .math-block{scrollbar-width:thin;scrollbar-color:var(--copper) var(--surface-2)}.home-hero{gap:var(--space-xl);padding-bottom:var(--space-xl);border-bottom:1px solid var(--rule);grid-template-columns:minmax(0,1fr);align-items:start;display:grid}.home-hero-copy{gap:var(--space-md);align-content:start;min-width:0;display:grid}.home-eyebrow{color:var(--copper);font-family:var(--font-mono);letter-spacing:.16em;text-transform:uppercase;align-items:center;gap:10px;font-size:11px;font-weight:500;line-height:1.5;display:flex}.home-eyebrow:before{content:"";width:30px;height:var(--rule-width);background:currentColor;flex:none}.home-hero h1{letter-spacing:-.022em;max-width:14ch;font-size:clamp(2.9rem,6.2vw,5rem);line-height:.98}.home-hero-accent{color:var(--copper);font-style:italic}.home-lede{max-width:48ch;color:var(--muted);font-size:clamp(1.02rem,1.5vw,1.18rem);line-height:1.6}.home-trust{color:var(--muted);font-family:var(--font-mono);letter-spacing:.12em;text-transform:uppercase;flex-wrap:wrap;align-items:center;gap:4px 0;margin:0;padding:0;font-size:10.5px;font-weight:500;line-height:1.7;list-style:none;display:flex}.home-trust li{padding-inline:10px}.home-trust li:first-child{padding-left:0}.home-trust li+li{border-left:1px solid var(--rule)}.home-ctas{gap:var(--space-sm);margin-top:var(--space-xs);flex-wrap:wrap;align-items:center;display:flex}.home-button{border:var(--rule-width) solid transparent;min-height:46px;font-family:var(--font-mono);letter-spacing:.08em;text-align:center;text-transform:uppercase;cursor:pointer;transition:transform .12s var(--ease), box-shadow .12s var(--ease), background-color .12s var(--ease), border-color .12s var(--ease), color .12s var(--ease);border-radius:10px;justify-content:center;align-items:center;gap:9px;padding:11px 18px;font-size:11.5px;font-weight:500;line-height:1.25;text-decoration:none;display:inline-flex}.home-button:focus-visible{outline:2.5px solid var(--copper);outline-offset:3px}.home-button:disabled{opacity:.45;cursor:not-allowed;box-shadow:none;transform:none}.home-button-primary{background:var(--cobalt);color:var(--paper);border-color:var(--cobalt);box-shadow:var(--shadow-hard)}.home-button-primary:hover{background:var(--cobalt);color:var(--paper);box-shadow:4px 4px 0 color-mix(in srgb, var(--ink) 26%, transparent);transform:translate(-1px,-1px)}.home-button-primary:active{box-shadow:1px 1px 0 color-mix(in srgb, var(--ink) 26%, transparent);transform:translate(2px,2px)}.home-button-secondary{background:var(--surface);color:var(--ink);border-color:var(--rule);box-shadow:var(--shadow)}.home-button-secondary:hover{color:var(--copper);border-color:var(--copper);box-shadow:var(--shadow-hard);transform:translate(-1px,-1px)}.home-button-secondary:active{box-shadow:1px 1px 0 color-mix(in srgb, var(--ink) 22%, transparent);transform:translate(1px,1px)}.home-hero-sample{min-width:0}.sample-card{padding:calc(var(--space-lg) + 4px) var(--space-md) var(--space-md);background:var(--surface);border:var(--rule-width) solid var(--rule);border-top:5px solid var(--copper);border-radius:var(--radius);box-shadow:var(--shadow);overflow-wrap:break-word;margin-top:24px;position:relative}.sample-card-label{transform-origin:0 100%;background:var(--copper);color:var(--paper);font-family:var(--font-mono);letter-spacing:.14em;text-transform:uppercase;border-radius:5px 5px 0 0;padding:4px 10px 3px;font-size:10px;font-weight:500;line-height:1.4;position:absolute;top:-5px;left:18px;transform:translateY(-100%)rotate(-1deg)}.sample-meta{margin-bottom:var(--space-sm);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px 12px;display:flex}.sample-topic{color:var(--muted);font-family:var(--font-mono);letter-spacing:.09em;text-transform:uppercase;font-size:10.5px;font-weight:500;line-height:1.5}.sample-badges{flex-wrap:wrap;gap:6px;display:flex}.sample-stem{margin-bottom:var(--space-md);overflow-wrap:break-word;font-size:1.02rem;line-height:1.6}.sample-card .choice{grid-template-columns:minmax(0,1fr)}.sample-card .choice-strike{display:none}.sample-check{width:100%;margin-top:var(--space-md)}.sample-result{margin-top:var(--space-md);padding:var(--space-sm) var(--space-md);background:var(--surface-2);border:var(--rule-width) solid var(--rule);border-left:5px solid var(--rule);box-shadow:var(--shadow);border-radius:0 10px 10px 0}.sample-result[data-verdict=correct]{border-left-color:var(--acid)}.sample-result[data-verdict=wrong]{border-left-color:var(--hazard)}.sample-result:focus{outline:2.5px solid var(--cobalt);outline-offset:3px}.sample-verdict{font-family:var(--font-display);font-size:1.22rem;line-height:1.2}.sample-result[data-verdict=correct] .sample-verdict{color:var(--acid)}.sample-result[data-verdict=wrong] .sample-verdict{color:var(--hazard)}.sample-answer{color:var(--muted);font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;margin-top:4px;font-size:11px;line-height:1.6}.sample-answer strong{color:var(--ink);font-weight:500}.sample-explanation-label{margin-top:var(--space-sm);color:var(--copper);font-family:var(--font-mono);letter-spacing:.14em;text-transform:uppercase;font-size:10px;font-weight:500;line-height:1.5}.sample-explanation{margin-top:4px;font-size:.95rem;line-height:1.62}.sample-another{margin-top:var(--space-sm)}.home-start-grid{gap:var(--space-md);grid-template-columns:minmax(0,1fr);display:grid}.home-start-card{padding:var(--space-md);background:var(--surface);border:var(--rule-width) solid var(--rule);border-radius:var(--radius);box-shadow:var(--shadow);color:var(--ink);transition:transform .14s var(--ease), box-shadow .14s var(--ease), border-color .14s var(--ease);grid-template-rows:auto auto 1fr auto;gap:6px;text-decoration:none;display:grid}.home-start-card:hover{color:var(--ink);border-color:var(--copper);box-shadow:var(--shadow-hard);transform:translate(-2px,-2px)}.home-start-card:focus-visible{outline:2.5px solid var(--cobalt);outline-offset:3px}.home-start-icon{background:color-mix(in srgb, var(--cobalt) 8%, var(--surface-2));width:42px;height:42px;color:var(--cobalt);border:1px solid color-mix(in srgb, var(--cobalt) 28%, var(--rule));border-radius:10px;place-items:center;margin-bottom:4px;display:inline-grid}.home-start-card h3{font-size:1.4rem;line-height:1.08}.home-start-card p{color:var(--muted);font-size:.95rem;line-height:1.5}.home-start-go{color:var(--copper);font-family:var(--font-mono);letter-spacing:.1em;text-transform:uppercase;align-items:center;gap:6px;margin-top:6px;font-size:10.5px;font-weight:500;display:inline-flex}.home-coverage-panels{gap:var(--space-md);grid-template-columns:minmax(0,1fr);display:grid}.home-coverage-panel{min-width:0;padding:var(--space-md);background:var(--surface);border:var(--rule-width) solid var(--rule);border-radius:var(--radius);box-shadow:var(--shadow)}.home-coverage-panel h3{margin-bottom:var(--space-sm);color:var(--copper);font-family:var(--font-mono);letter-spacing:.14em;text-transform:uppercase;font-size:10.5px;font-weight:500;line-height:1.5}.home-coverage-list{gap:10px;margin:0;padding:0;list-style:none;display:grid}.home-coverage-row{grid-template-columns:minmax(88px,130px) minmax(0,1fr);align-items:center;gap:8px;display:grid}.home-coverage-label{min-width:0;font-size:.92rem;line-height:1.4}.home-coverage-label .badge{text-overflow:ellipsis;max-width:100%;overflow:hidden}.home-coverage-meter{grid-template-columns:minmax(0,1fr) 4ch;align-items:center;gap:8px;min-width:0;display:grid}.home-coverage-count{color:var(--muted);font-family:var(--font-mono);font-variant-numeric:tabular-nums;text-align:right;font-size:11.5px;line-height:1.4}.home-coverage-note{margin-top:var(--space-sm);color:var(--muted);font-family:var(--font-mono);letter-spacing:.04em;font-size:10.5px;line-height:1.55}.home-papers{margin-top:var(--space-lg)}.home-papers-head{margin-bottom:var(--space-sm);flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:6px 16px;display:flex}.home-papers-head h3{font-size:clamp(1.4rem,2.6vw,1.8rem)}.home-papers-note{color:var(--muted);font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;font-size:10.5px}.home-papers-grid{gap:var(--space-md);grid-template-columns:minmax(0,1fr);display:grid}.home-paper{gap:var(--space-sm);min-width:0;padding:var(--space-md);background:var(--surface);border:var(--rule-width) solid var(--rule);border-top:3px solid var(--cobalt);border-radius:var(--radius);box-shadow:var(--shadow);flex-direction:column;display:flex}.home-paper[data-kind=lab]{border-top-color:var(--copper)}.home-paper-icon{color:var(--cobalt)}.home-paper[data-kind=lab] .home-paper-icon{color:var(--copper)}.home-paper h3{font-size:1.28rem;line-height:1.1}.home-paper-meta{color:var(--muted);font-family:var(--font-mono);letter-spacing:.1em;text-transform:uppercase;align-items:baseline;gap:6px;font-size:10.5px;line-height:1.4;display:flex}.home-paper-count{color:var(--ink);letter-spacing:0;font-size:1.35rem;line-height:1}.home-paper-copy{color:var(--muted);font-size:.93rem;line-height:1.5}.home-paper-link{min-height:44px;color:var(--cobalt);border-bottom:2px solid color-mix(in srgb, var(--cobalt) 35%, transparent);font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;align-self:flex-start;align-items:center;gap:6px;margin-top:auto;font-size:11px;font-weight:500;line-height:1.3;text-decoration:none;display:inline-flex}.home-paper-link:hover{color:var(--copper);border-bottom-color:var(--copper)}.home-paper-link:focus-visible{outline:2.5px solid var(--cobalt);outline-offset:3px}.home-note{margin-top:var(--space-md);background:var(--surface-2);border:var(--rule-width) solid var(--rule);border-left:4px solid var(--copper);color:var(--muted);font-family:var(--font-mono);letter-spacing:.01em;border-radius:0 8px 8px 0;padding:12px 16px;font-size:11.5px;line-height:1.7}.home-note a{width:-moz-fit-content;width:fit-content;min-height:44px;color:var(--ink);-webkit-text-decoration-color:var(--copper);text-decoration-color:var(--copper);text-underline-offset:4px;align-items:center;display:flex}.home-note a:hover{color:var(--copper)}.home-steps{grid-template-columns:repeat(4,minmax(0,1fr));gap:0;margin:0;padding:0;list-style:none;display:grid}.home-step{min-width:0;padding:0 var(--space-md);border-left:1px solid var(--rule);align-content:start;gap:6px;display:grid}.home-step:first-child{border-left:0;padding-left:0}.home-step:last-child{padding-right:0}.home-step-index{color:var(--copper);font-family:var(--font-mono);letter-spacing:.14em;font-size:10.5px;font-weight:500;line-height:1.5}.home-step h3{font-size:1.35rem}.home-step p{color:var(--muted);font-size:.93rem;line-height:1.52}.home-honesty{justify-content:space-between;align-items:center;gap:var(--space-sm) var(--space-lg);margin-top:var(--space-xl);padding:var(--space-md);background:var(--paper-deep);border-top:var(--rule-strong) solid var(--ink);border-radius:0 0 var(--radius) var(--radius);flex-wrap:wrap;display:flex}.home-honesty p{max-width:78ch;color:var(--muted);font-family:var(--font-mono);letter-spacing:.01em;font-size:12px;line-height:1.7}.home-honesty a{min-height:44px;color:var(--ink);font-family:var(--font-mono);-webkit-text-decoration-color:var(--copper);text-decoration-color:var(--copper);text-underline-offset:4px;align-items:center;font-size:12px;display:inline-flex}.home-honesty a:hover{color:var(--copper)}@media (min-width:760px){.home-start-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}@media (min-width:860px){.home-coverage-panels{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (min-width:980px){.home-hero{grid-template-columns:minmax(0,1.04fr) minmax(0,.96fr);gap:clamp(2.5rem,5vw,4.75rem)}.home-papers-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (min-width:1440px){.home-papers-grid{grid-template-columns:repeat(4,minmax(0,1fr))}}@media (max-width:480px){.home-ctas{grid-template-columns:minmax(0,1fr);display:grid}.home-trust{letter-spacing:.1em;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 0;font-size:10px;display:grid}.home-trust li{padding-inline:8px}.home-trust li:nth-child(odd){border-left:0;padding-left:0}.home-trust li:nth-child(2n){border-left:1px solid var(--rule)}.sample-card{padding-inline:var(--space-sm)}.home-coverage-row{grid-template-columns:minmax(0,1fr);gap:4px}.home-coverage-count{text-align:left}.home-steps{grid-template-columns:minmax(0,1fr)}.home-step{padding:var(--space-md) 0;border-left:0;border-top:1px solid var(--rule)}.home-step:first-child{border-top:0;padding-top:0}.home-step:last-child{padding-bottom:0}}@media (prefers-reduced-motion:reduce){.home-button,.home-start-card{transition:none}}.bank{max-width:var(--page-max);grid-template-columns:minmax(0,1fr);margin-inline:auto;display:grid}.bank-head{gap:var(--space-sm);margin-bottom:var(--space-lg);padding-bottom:var(--space-md);border-bottom:1px solid var(--rule);display:grid}.bank-eyebrow{color:var(--copper);font-family:var(--font-mono);letter-spacing:.16em;text-transform:uppercase;align-items:center;gap:10px;font-size:11px;font-weight:500;line-height:1.5;display:flex}.bank-eyebrow:before{content:"";width:30px;height:var(--rule-width);background:currentColor;flex:none}.bank h1{letter-spacing:-.02em;max-width:20ch;font-size:clamp(2.4rem,5vw,3.6rem);line-height:1}.bank-lede{max-width:64ch;color:var(--muted);font-size:1.02rem;line-height:1.6}.bank-search{min-height:52px;margin-bottom:var(--space-md);background:var(--surface);border:var(--rule-width) solid var(--rule);box-shadow:var(--shadow);transition:border-color .12s var(--ease), box-shadow .12s var(--ease);border-radius:12px;align-items:center;gap:10px;padding:0 14px;display:flex}.bank-search:focus-within{border-color:var(--cobalt);outline:2.5px solid var(--cobalt);outline-offset:2px;box-shadow:var(--shadow-hard)}.bank-search .icon{color:var(--copper);flex:none}.bank-search input{min-width:0;min-height:48px;color:var(--ink);font-family:var(--font-ui);background:0 0;border:0;flex:1;padding:0;font-size:1rem;line-height:1.5}.bank-search input:focus{outline:none}.bank-search input::placeholder{color:var(--muted);opacity:.85}.bank-filters-toggle{margin-bottom:var(--space-md);display:none}.bank-filters-badge{background:var(--copper);min-width:20px;height:20px;color:var(--paper);border-radius:999px;place-items:center;padding:0 5px;font-size:10.5px;font-weight:500;line-height:1;display:inline-grid}.bank-layout{gap:var(--space-lg);grid-template-columns:minmax(0,1fr);align-items:start;display:grid}.bank-rail{gap:var(--space-md);min-width:0;padding:var(--space-md);background:var(--surface);border:var(--rule-width) solid var(--rule);border-top:4px solid var(--cobalt);border-radius:var(--radius);box-shadow:var(--shadow);display:grid}.bank-rail-title{color:var(--copper);font-family:var(--font-mono);letter-spacing:.14em;text-transform:uppercase;font-size:10.5px;font-weight:500;line-height:1.5}.bank-field{gap:6px;min-width:0;display:grid}.bank-field label{color:var(--muted);font-family:var(--font-mono);letter-spacing:.12em;text-transform:uppercase;font-size:10.5px;font-weight:500;line-height:1.4}.bank-field select{background:var(--surface-2);width:100%;min-height:44px;color:var(--ink);border:1.5px solid var(--rule);font-family:var(--font-ui);cursor:pointer;transition:border-color .12s var(--ease);border-radius:10px;padding:10px 12px;font-size:.95rem;line-height:1.4}.bank-field select:hover{border-color:var(--copper)}.bank-field select:focus-visible{outline:2.5px solid var(--cobalt);outline-offset:2px}.bank-results{gap:var(--space-md);align-content:start;min-width:0;display:grid}.bank-results-head{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px 16px;display:flex}.bank-count{color:var(--muted);font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;font-size:11.5px;font-weight:500;line-height:1.5}.bank-reset{min-height:44px}.bank-more{min-height:48px;margin-top:var(--space-xs);justify-self:center}.bank-more-count{border-left:1px solid var(--rule);color:var(--muted);letter-spacing:.06em;margin-left:2px;padding-left:8px;font-size:10.5px}.bank-list{gap:var(--space-md);grid-template-columns:minmax(0,1fr);display:grid}.question-card{min-width:0;padding:var(--space-md);background:var(--surface);border:var(--rule-width) solid var(--rule);border-left:4px solid var(--cobalt);border-radius:var(--radius);box-shadow:var(--shadow);transition:transform .14s var(--ease), box-shadow .14s var(--ease), border-color .14s var(--ease);align-content:start;gap:10px;display:grid}.question-card:hover{border-color:var(--copper);box-shadow:var(--shadow-hard);transform:translate(-2px,-2px)}.question-card[data-domain=general]{border-left-color:var(--cobalt)}.question-card[data-domain=physical]{border-left-color:var(--copper)}.question-card[data-domain=analytical]{border-left-color:var(--acid)}.question-card[data-domain=organic]{border-left-color:var(--hazard)}.question-card[data-domain=laboratory]{border-left-color:var(--ink)}.question-card-top{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:6px 10px;display:flex}.question-card-id{min-width:0;color:var(--muted);font-family:var(--font-mono);letter-spacing:.05em;overflow-wrap:anywhere;font-size:10.5px;line-height:1.5}.question-card-stash{color:var(--copper);font-family:var(--font-mono);letter-spacing:.1em;text-transform:uppercase;align-items:center;gap:4px;font-size:10px;font-weight:500;line-height:1.4;display:inline-flex}.question-card-badges{flex-wrap:wrap;gap:6px;display:flex}.question-card-stem{-webkit-line-clamp:3;overflow-wrap:break-word;-webkit-box-orient:vertical;font-size:.97rem;line-height:1.55;display:-webkit-box;overflow:hidden}.question-card-foot{border-top:1px solid var(--rule);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:6px 10px;margin-top:auto;padding-top:10px;display:flex}.question-card-topic{min-width:0;color:var(--muted);font-family:var(--font-mono);letter-spacing:.07em;text-transform:uppercase;overflow-wrap:anywhere;font-size:10px;line-height:1.5}.question-card-open{min-height:44px;color:var(--cobalt);font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;transition:color .12s var(--ease), border-color .12s var(--ease);border-bottom:2px solid #0000;align-items:center;gap:4px;padding:0 4px;font-size:11px;font-weight:500;line-height:1.3;text-decoration:none;display:inline-flex}.question-card-open:hover{color:var(--copper);border-bottom-color:var(--copper)}.bank-empty{padding:var(--space-lg) var(--space-md);background:var(--surface-2);border:var(--rule-width) dashed var(--rule);border-left:4px solid var(--copper);border-radius:0 var(--radius) var(--radius) 0}.bank-empty-title{font-family:var(--font-display);font-size:1.4rem;line-height:1.15}.bank-empty-copy{color:var(--muted);margin-top:6px;font-size:.95rem;line-height:1.55}.question{gap:var(--space-md);grid-template-columns:minmax(0,1fr);max-width:820px;margin-inline:auto;display:grid}.question-crumbs{color:var(--muted);font-family:var(--font-mono);letter-spacing:.07em;text-transform:uppercase;flex-wrap:wrap;align-items:center;gap:8px;font-size:11px;line-height:1.5;display:flex}.question-crumbs a{min-height:44px;color:var(--cobalt);align-items:center;gap:6px;text-decoration:none;display:inline-flex}.question-crumbs a:hover,.question-crumbs>.icon{color:var(--copper)}.question-crumbs span{overflow-wrap:anywhere;min-width:0}.question-head{padding-bottom:var(--space-md);border-bottom:1px solid var(--rule);gap:10px;display:grid}.question-eyebrow{color:var(--copper);font-family:var(--font-mono);letter-spacing:.14em;text-transform:uppercase;align-items:center;gap:10px;font-size:11px;font-weight:500;line-height:1.5;display:flex}.question-eyebrow:before{content:"";width:26px;height:var(--rule-width);background:currentColor;flex:none}.question-head h1{letter-spacing:-.02em;font-size:clamp(2rem,4.4vw,3rem);line-height:1.02}.question-head h1:focus{outline:2.5px solid var(--cobalt);outline-offset:3px}.question-badges{flex-wrap:wrap;gap:6px;display:flex}.question-sheet{min-width:0;padding:var(--space-md);background:var(--surface);border:var(--rule-width) solid var(--rule);border-top:5px solid var(--copper);border-radius:var(--radius);box-shadow:var(--shadow);overflow-wrap:break-word}.question-stem-label{margin-bottom:var(--space-xs);color:var(--copper);font-family:var(--font-mono);letter-spacing:.14em;text-transform:uppercase;font-size:10px;font-weight:500;line-height:1.5}.question-stem{margin-bottom:var(--space-md);font-size:1.05rem;line-height:1.65}.question-sheet .choice{grid-template-columns:minmax(0,1fr)}.question-sheet .choice-strike{display:none}.question-actions{align-items:center;gap:var(--space-sm);margin-top:var(--space-md);flex-wrap:wrap;display:flex}.question-check{min-width:132px}.question-stash[aria-pressed=true]{color:var(--copper);border-color:var(--copper);background:color-mix(in srgb, var(--copper) 9%, var(--surface))}.question-verdict{margin-top:var(--space-md);padding:var(--space-sm) var(--space-md);background:var(--surface-2);border:var(--rule-width) solid var(--rule);border-left:5px solid var(--rule);box-shadow:var(--shadow);border-radius:0 10px 10px 0}.question-verdict[data-verdict=correct]{border-left-color:var(--acid)}.question-verdict[data-verdict=wrong]{border-left-color:var(--hazard)}.question-verdict:focus{outline:2.5px solid var(--cobalt);outline-offset:3px}.question-verdict-line{font-family:var(--font-display);font-size:1.3rem;line-height:1.2}.question-verdict[data-verdict=correct] .question-verdict-line{color:var(--acid)}.question-verdict[data-verdict=wrong] .question-verdict-line{color:var(--hazard)}.question-verdict-answer{color:var(--muted);font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;margin-top:4px;font-size:11px;line-height:1.6}.question-verdict-answer strong{color:var(--ink);font-weight:500}.question-solution{margin-top:var(--space-md);padding:var(--space-md);background:var(--surface-2);border:var(--rule-width) solid var(--rule);border-left:5px solid var(--cobalt);border-radius:0 10px 10px 0}.question-solution:focus{outline:2.5px solid var(--cobalt);outline-offset:3px}.question-solution-label{color:var(--copper);font-family:var(--font-mono);letter-spacing:.14em;text-transform:uppercase;font-size:10px;font-weight:500;line-height:1.5}.solution-paragraph{overflow-wrap:break-word;margin-top:8px;font-size:.98rem;line-height:1.65}.question-verified-note{margin-top:var(--space-sm);padding-top:var(--space-sm);border-top:1px solid var(--rule);color:var(--muted);font-family:var(--font-mono);letter-spacing:.03em;font-size:10.5px;line-height:1.6}.question-solution .math-block,.question-stem .math-block,.question-card-stem .math-block{scrollbar-width:thin;scrollbar-color:var(--copper) var(--surface-2)}.question-solution .math-block::-webkit-scrollbar{height:8px}.question-stem .math-block::-webkit-scrollbar{height:8px}.question-card-stem .math-block::-webkit-scrollbar{height:8px}.question-solution .math-block::-webkit-scrollbar-track{background:var(--surface-2)}.question-stem .math-block::-webkit-scrollbar-track{background:var(--surface-2)}.question-card-stem .math-block::-webkit-scrollbar-track{background:var(--surface-2)}.question-solution .math-block::-webkit-scrollbar-thumb{background:color-mix(in srgb, var(--copper) 62%, var(--surface-2));border-radius:8px}.question-stem .math-block::-webkit-scrollbar-thumb{background:color-mix(in srgb, var(--copper) 62%, var(--surface-2));border-radius:8px}.question-card-stem .math-block::-webkit-scrollbar-thumb{background:color-mix(in srgb, var(--copper) 62%, var(--surface-2));border-radius:8px}.question-nav{justify-content:space-between;align-items:stretch;gap:var(--space-sm);margin-top:var(--space-xs);flex-wrap:wrap;display:flex}.question-nav-link{background:var(--surface);max-width:100%;min-height:52px;color:var(--ink);border:var(--rule-width) solid var(--rule);box-shadow:var(--shadow);font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;transition:transform .12s var(--ease), box-shadow .12s var(--ease), border-color .12s var(--ease), color .12s var(--ease);border-radius:10px;flex:200px;align-items:center;gap:9px;padding:10px 14px;font-size:11px;font-weight:500;line-height:1.3;text-decoration:none;display:inline-flex}.question-nav-link:hover{color:var(--copper);border-color:var(--copper);box-shadow:var(--shadow-hard);transform:translate(-1px,-1px)}.question-nav-next{text-align:right;justify-content:flex-end}.question-nav-link.is-disabled{opacity:.45;cursor:default;box-shadow:none}.question-nav-link.is-disabled:hover{color:var(--ink);border-color:var(--rule);box-shadow:none;transform:none}.question-nav-text{gap:2px;min-width:0;display:grid}.question-nav-id{color:var(--muted);letter-spacing:.03em;text-transform:none;overflow-wrap:anywhere;font-size:9.5px;font-weight:400;line-height:1.4}.question-report{margin-top:var(--space-sm);padding:var(--space-md);background:var(--paper-deep);border-top:var(--rule-strong) solid var(--ink);border-radius:0 0 var(--radius) var(--radius);gap:10px;display:grid}.question-report-label{font-family:var(--font-display);font-size:1.4rem;line-height:1.1}.question-report-copy{max-width:68ch;color:var(--muted);font-size:.95rem;line-height:1.55}.question-report-actions{gap:var(--space-sm);flex-wrap:wrap;margin-top:4px;display:flex}.question-copy-note{color:var(--acid);font-family:var(--font-mono);letter-spacing:.05em;font-size:11px;line-height:1.6}.question-copy-note[data-tone=hazard]{color:var(--hazard)}.question-diagnostics{background:var(--surface);border:1px solid var(--rule);color:var(--ink);font-family:var(--font-mono);white-space:pre-wrap;overflow-wrap:anywhere;border-radius:8px;margin:0;padding:12px 14px;font-size:11.5px;line-height:1.7}.question-missing-back{width:-moz-fit-content;width:fit-content;margin-top:var(--space-lg)}.question-missing code{background:var(--surface-2);border:1px solid var(--rule);font-family:var(--font-mono);overflow-wrap:anywhere;border-radius:5px;padding:1px 6px;font-size:.9em}@media (min-width:980px){.bank-layout{grid-template-columns:272px minmax(0,1fr)}.bank-rail{position:sticky;top:84px}}@media (min-width:1100px){.bank-list{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (max-width:979px){.bank-filters-toggle{display:inline-flex}.bank-rail{display:none}.bank-rail[data-open=true]{display:grid}}@media (max-width:480px){.bank-results-head{align-items:stretch}.bank-reset{width:100%}.question-actions{grid-template-columns:minmax(0,1fr);display:grid}.question-check{width:100%}.question-report-actions{grid-template-columns:minmax(0,1fr);display:grid}.question-nav-link{flex-basis:100%}}@media (prefers-reduced-motion:reduce){.bank-search,.bank-field select,.question-card,.question-card-open,.question-nav-link{transition:none}}.practice{gap:var(--space-md);max-width:var(--page-max);grid-template-columns:minmax(0,1fr);margin-inline:auto;display:grid}.practice-head{gap:var(--space-sm);padding-bottom:var(--space-md);border-bottom:1px solid var(--rule);display:grid}.practice-eyebrow{color:var(--copper);font-family:var(--font-mono);letter-spacing:.16em;text-transform:uppercase;align-items:center;gap:10px;font-size:11px;font-weight:500;line-height:1.5;display:flex}.practice-eyebrow:before{content:"";width:30px;height:var(--rule-width);background:currentColor;flex:none}.practice h1{letter-spacing:-.02em;max-width:20ch;font-size:clamp(2.4rem,5vw,3.6rem);line-height:1}.practice-lede{max-width:64ch;color:var(--muted);font-size:1.02rem;line-height:1.6}.practice-presets{gap:var(--space-sm);grid-template-columns:repeat(auto-fill,minmax(220px,1fr));display:grid}.practice-preset{background:var(--surface);min-width:0;color:var(--ink);border:var(--rule-width) solid var(--rule);box-shadow:var(--shadow);text-align:left;cursor:pointer;transition:transform .12s var(--ease), box-shadow .12s var(--ease), border-color .12s var(--ease), background-color .12s var(--ease);border-radius:12px;grid-template-columns:auto minmax(0,1fr);grid-template-areas:"icon name""copy copy";align-items:center;gap:8px 10px;padding:14px 16px;display:grid}.practice-preset .icon{color:var(--copper);grid-area:icon}.practice-preset:hover{border-color:var(--copper);box-shadow:var(--shadow-hard);transform:translate(-1px,-1px)}.practice-preset:focus-visible{outline:2.5px solid var(--cobalt);outline-offset:3px}.practice-preset[aria-pressed=true]{border-color:var(--cobalt);background:color-mix(in srgb, var(--cobalt) 7%, var(--surface));box-shadow:var(--shadow-hard)}.practice-preset[aria-pressed=true] .icon,.practice-preset[aria-pressed=true] .practice-preset-name{color:var(--cobalt)}.practice-preset-name{font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;grid-area:name;font-size:12px;font-weight:500;line-height:1.4}.practice-preset-copy{color:var(--muted);grid-area:copy;font-size:.88rem;line-height:1.5}.practice-option{max-width:420px}.practice-custom{gap:var(--space-md);min-width:0;display:grid}.practice-custom .bank-search{margin-bottom:0}.practice-custom-fields{gap:var(--space-sm);grid-template-columns:repeat(auto-fill,minmax(180px,1fr));display:grid}.practice-modes{gap:var(--space-sm);flex-wrap:wrap;display:flex}.practice-mode[aria-pressed=true]{color:var(--cobalt);border-color:var(--cobalt);background:color-mix(in srgb, var(--cobalt) 9%, var(--surface))}.practice-summary{gap:var(--space-sm);padding:var(--space-md);background:var(--surface);border:var(--rule-width) solid var(--rule);border-top:4px solid var(--copper);border-radius:var(--radius);box-shadow:var(--shadow);justify-items:start;display:grid}.practice-count{font-family:var(--font-display);font-size:1.7rem;line-height:1.1}.practice-empty{max-width:64ch;color:var(--muted);font-size:.95rem;line-height:1.6}.practice-limit{color:var(--muted);font-family:var(--font-mono);letter-spacing:.05em;font-size:11px;line-height:1.7}.practice-start{margin-top:4px}.drill{gap:var(--space-md);max-width:var(--page-max);grid-template-columns:minmax(0,1fr);margin-inline:auto;display:grid}.drill-head{justify-content:space-between;align-items:flex-end;gap:var(--space-sm);padding-bottom:var(--space-md);border-bottom:1px solid var(--rule);flex-wrap:wrap;display:flex}.drill-head-copy{gap:var(--space-sm);min-width:0;display:grid}.drill-eyebrow{color:var(--copper);font-family:var(--font-mono);letter-spacing:.16em;text-transform:uppercase;align-items:center;gap:10px;font-size:11px;font-weight:500;line-height:1.5;display:flex}.drill-eyebrow:before{content:"";width:30px;height:var(--rule-width);background:currentColor;flex:none}.drill h1{letter-spacing:-.02em;overflow-wrap:anywhere;max-width:24ch;font-size:clamp(2rem,4.4vw,3rem);line-height:1.02}.drill-submit{flex:none}.drill-meta{font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;flex-wrap:wrap;align-items:center;gap:6px 18px;font-size:11px;font-weight:500;line-height:1.6;display:flex}.drill-position{color:var(--ink)}.drill-meta-item{color:var(--muted)}.drill-timer{color:var(--cobalt);font-variant-numeric:tabular-nums;align-items:center;gap:6px;margin-left:auto;display:inline-flex}.drill-timer[data-tone=hazard]{color:var(--hazard)}.drill-layout{gap:var(--space-lg);grid-template-columns:minmax(0,1fr);align-items:start;display:grid}.drill-main{gap:var(--space-md);min-width:0;display:grid}.drill-sheet{min-width:0;padding:var(--space-md);background:var(--surface);border:var(--rule-width) solid var(--rule);border-top:5px solid var(--copper);border-radius:var(--radius);box-shadow:var(--shadow);overflow-wrap:break-word}.drill-sheet .question-badges{margin-bottom:var(--space-sm)}.drill-note{color:var(--muted);font-family:var(--font-mono);letter-spacing:.05em;font-size:11px;line-height:1.6}.drill-flag[aria-pressed=true]{color:var(--copper);border-color:var(--copper);background:color-mix(in srgb, var(--copper) 9%, var(--surface))}button.question-nav-link{cursor:pointer}button.question-nav-link:disabled{opacity:.45;cursor:not-allowed;box-shadow:none}button.question-nav-link:disabled:hover{color:var(--ink);border-color:var(--rule);box-shadow:none;transform:none}.drill-rail{gap:var(--space-md);min-width:0;padding:var(--space-md);background:var(--surface);border:var(--rule-width) solid var(--rule);border-top:4px solid var(--cobalt);border-radius:var(--radius);box-shadow:var(--shadow);display:grid}.question-map{grid-template-columns:repeat(auto-fill,minmax(38px,1fr));gap:6px;display:grid}.question-map-cell{background:var(--surface-2);min-height:38px;color:var(--muted);border:1.5px solid var(--rule);font-family:var(--font-mono);cursor:pointer;transition:border-color .12s var(--ease), color .12s var(--ease), background-color .12s var(--ease);border-radius:8px;place-items:center;padding:4px;font-size:11.5px;font-weight:500;line-height:1;display:grid;position:relative}.question-map-cell:hover{border-color:var(--copper);color:var(--copper)}.question-map-cell:focus-visible{outline:2.5px solid var(--cobalt);outline-offset:2px}.question-map-cell[data-answered=true]{background:color-mix(in srgb, var(--cobalt) 12%, var(--surface));border-color:var(--cobalt);color:var(--cobalt)}.question-map-cell[data-flagged=true]:after{content:"";background:var(--copper);border-radius:2px;width:7px;height:7px;position:absolute;top:3px;right:3px}.question-map-cell[data-current=true]{border-color:var(--ink);box-shadow:0 0 0 1.5px var(--ink);color:var(--ink)}.drill-legend{color:var(--muted);font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;flex-wrap:wrap;gap:6px 14px;margin:0;padding:0;font-size:10px;line-height:1.6;list-style:none;display:flex}.drill-legend li{align-items:center;gap:6px;display:inline-flex}.drill-swatch{background:var(--surface-2);border:1.5px solid var(--rule);border-radius:4px;width:12px;height:12px}.drill-swatch[data-state=answered]{background:color-mix(in srgb, var(--cobalt) 18%, var(--surface));border-color:var(--cobalt)}.drill-swatch[data-state=flagged]{background:var(--copper);border-color:var(--copper)}.drill-swatch[data-state=current]{border-color:var(--ink);box-shadow:0 0 0 1px var(--ink)}.drill-stats{padding-top:var(--space-sm);border-top:1px solid var(--rule);color:var(--muted);font-family:var(--font-mono);letter-spacing:.05em;gap:4px;font-size:11px;line-height:1.7;display:grid}.drill-modal-backdrop{z-index:100;padding:var(--space-md);background:color-mix(in srgb, var(--ink) 45%, transparent);place-items:center;display:grid;position:fixed;inset:0}.drill-modal{gap:var(--space-sm);width:min(430px,100%);max-height:calc(100dvh - 2 * var(--space-md));padding:var(--space-md);background:var(--surface);border:var(--rule-width) solid var(--rule);border-top:5px solid var(--copper);border-radius:var(--radius);box-shadow:var(--shadow-hard);display:grid;overflow-y:auto}.drill-modal h2{font-size:1.6rem;line-height:1.1}.drill-modal-counts{color:var(--copper);font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;font-size:12px;font-weight:500;line-height:1.6}.drill-modal-copy{color:var(--muted);font-size:.95rem;line-height:1.6}.drill-modal-actions{gap:var(--space-sm);flex-wrap:wrap;margin-top:4px;display:flex}.drill-modal-actions .home-button{flex:140px}.drill-missing-back{width:-moz-fit-content;width:fit-content;margin-top:var(--space-lg)}.drill-missing code{background:var(--surface-2);border:1px solid var(--rule);font-family:var(--font-mono);overflow-wrap:anywhere;border-radius:5px;padding:1px 6px;font-size:.9em}.drill-finished-actions{gap:var(--space-sm);margin-top:var(--space-lg);flex-wrap:wrap;display:flex}@media (min-width:980px){.drill-layout{grid-template-columns:minmax(0,1fr) 280px}.drill-rail{position:sticky;top:84px}}@media (max-width:480px){.practice-presets{grid-template-columns:minmax(0,1fr)}.practice-modes .home-button{flex:140px}.drill-head{flex-direction:column;align-items:stretch}.drill-submit{width:100%}.drill-timer{margin-left:0}.drill-modal-actions{grid-template-columns:minmax(0,1fr);display:grid}}@media (prefers-reduced-motion:reduce){.practice-preset,.question-map-cell{transition:none}}.results,.progress,.review{gap:var(--space-md);max-width:var(--page-max);grid-template-columns:minmax(0,1fr);margin-inline:auto;display:grid}.results-actions{flex-wrap:wrap;gap:8px;display:flex}.results-score{gap:var(--space-sm);grid-template-columns:repeat(4,minmax(0,1fr));display:grid}.results-stat{padding:var(--space-sm) var(--space-md);background:var(--surface);border:var(--rule-width) solid var(--rule);border-top:4px solid var(--cobalt);border-radius:var(--radius);box-shadow:var(--shadow);gap:4px;display:grid}.results-stat-value{font-family:var(--font-display);overflow-wrap:anywhere;font-size:clamp(1.5rem,3vw,2.1rem);line-height:1.05}.results-stat-label{color:var(--muted);font-family:var(--font-mono);letter-spacing:.14em;text-transform:uppercase;font-size:10.5px}.results-breakdown{gap:var(--space-md);grid-template-columns:repeat(auto-fit,minmax(260px,1fr));display:grid}.results-review-title{margin-bottom:var(--space-sm);font-family:var(--font-display);font-size:clamp(1.5rem,3vw,2rem)}.results-review{gap:var(--space-sm);display:grid}.results-question{padding:var(--space-md);background:var(--surface);border:var(--rule-width) solid var(--rule);border-left:5px solid var(--acid);box-shadow:var(--shadow);border-radius:0 10px 10px 0}.results-question[data-verdict=wrong]{border-left-color:var(--hazard)}.results-question-head{margin-bottom:var(--space-sm);flex-wrap:wrap;align-items:baseline;gap:6px 12px;display:flex}.results-question-index{color:var(--muted);font-family:var(--font-mono);letter-spacing:.12em;text-transform:uppercase;font-size:10.5px}.results-question-topic{font-family:var(--font-display);color:var(--ink);font-size:1.3rem;text-decoration:none}.results-question-topic:hover{color:var(--cobalt);text-decoration:underline}.results-verdict{border:1px solid var(--rule);font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;border-radius:999px;margin-left:auto;padding:2px 9px;font-size:10.5px}.results-verdict[data-verdict=correct]{color:var(--acid);border-color:color-mix(in srgb, var(--acid) 35%, var(--rule));background:color-mix(in srgb, var(--acid) 8%, var(--surface-2))}.results-verdict[data-verdict=wrong]{color:var(--hazard);border-color:color-mix(in srgb, var(--hazard) 35%, var(--rule));background:color-mix(in srgb, var(--hazard) 8%, var(--surface-2))}.results-verdict[data-verdict=unseen]{color:var(--muted)}.results-answer{margin-block:var(--space-sm);font-family:var(--font-mono);letter-spacing:.04em;flex-wrap:wrap;gap:6px 10px;font-size:12px;display:flex}.results-answer strong{color:var(--cobalt)}.results-answer-sep{color:var(--muted)}.results-question .question-solution{margin-top:var(--space-sm)}.results-foot{margin-top:var(--space-sm);flex-wrap:wrap;gap:8px;display:flex}.progress-kpis{gap:var(--space-sm);grid-template-columns:repeat(4,minmax(0,1fr)) auto;align-items:stretch;display:grid}.progress-kpi{padding:var(--space-sm) var(--space-md);background:var(--surface);border:var(--rule-width) solid var(--rule);border-radius:var(--radius);box-shadow:var(--shadow);align-content:center;gap:4px;display:grid}.progress-kpi-value{font-family:var(--font-display);font-size:clamp(1.6rem,3vw,2.2rem);line-height:1.05}.progress-kpi-label{color:var(--muted);font-family:var(--font-mono);letter-spacing:.14em;text-transform:uppercase;font-size:10.5px}.progress-ring-wrap{padding:var(--space-sm);background:var(--surface);border:var(--rule-width) solid var(--rule);border-radius:var(--radius);box-shadow:var(--shadow);place-items:center;display:grid}.progress-weak-list,.progress-recent{gap:8px;margin:0;padding:0;list-style:none;display:grid}.progress-weak-item{padding:var(--space-sm) var(--space-md);background:var(--surface);border:var(--rule-width) solid var(--rule);border-left:5px solid var(--hazard);border-radius:0 10px 10px 0;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px 16px;display:flex}.progress-weak-copy{gap:2px;min-width:0;display:grid}.progress-weak-topic{font-size:1.02rem}.progress-recent-item{padding:9px var(--space-md);background:var(--surface);border:var(--rule-width) solid var(--rule);border-radius:8px;grid-template-columns:minmax(0,1fr) auto auto auto;align-items:center;gap:8px 14px;display:grid}.progress-recent-topic{text-overflow:ellipsis;white-space:nowrap;min-width:0;overflow:hidden}.progress-recent-item .results-verdict{margin-left:0}.progress-recent-meta{color:var(--muted);font-family:var(--font-mono);letter-spacing:.04em;text-transform:capitalize;font-size:11px}.progress-data{padding:var(--space-md);background:var(--surface);border:var(--rule-width) solid var(--rule);border-top:4px solid var(--copper);border-radius:var(--radius);box-shadow:var(--shadow)}.progress-sync{margin-bottom:var(--space-sm);color:var(--muted);font-family:var(--font-mono);letter-spacing:.05em;font-size:11px}.progress-data-actions{flex-wrap:wrap;gap:8px;display:flex}.progress-reset{color:var(--hazard)}.review-toolbar{justify-content:space-between;align-items:center;gap:var(--space-sm);flex-wrap:wrap;display:flex}.review-tabs{flex-wrap:wrap;gap:6px;display:flex}.review-tab{background:var(--surface);border:var(--rule-width) solid var(--rule);color:var(--muted);font-family:var(--font-mono);letter-spacing:.06em;text-transform:uppercase;cursor:pointer;transition:color .16s var(--ease), border-color .16s var(--ease);border-radius:999px;align-items:center;gap:8px;padding:9px 16px;font-size:12px;display:inline-flex}.review-tab:hover{color:var(--ink);border-color:var(--cobalt)}.review-tab:focus-visible{outline:2px solid var(--cobalt);outline-offset:2px}.review-tab[aria-selected=true]{color:var(--surface);background:var(--cobalt);border-color:var(--cobalt)}.review-tab-count{background:color-mix(in srgb, var(--ink) 10%, transparent);font-variant-numeric:tabular-nums;border-radius:999px;place-items:center;min-width:20px;height:20px;padding-inline:5px;font-size:11px;display:inline-grid}.review-tab[aria-selected=true] .review-tab-count{background:color-mix(in srgb, var(--surface) 24%, transparent)}.review-list{gap:var(--space-sm);margin:0;padding:0;list-style:none;display:grid}.review-item{padding:var(--space-md);background:var(--surface);border:var(--rule-width) solid var(--rule);border-radius:var(--radius);box-shadow:var(--shadow);flex-wrap:wrap;justify-content:space-between;align-items:flex-start;gap:12px 18px;display:flex}.review-item-copy{flex:320px;gap:6px;min-width:0;display:grid}.review-topic{font-family:var(--font-display);color:var(--ink);font-size:1.25rem;text-decoration:none}.review-topic:hover{color:var(--cobalt);text-decoration:underline}.review-stem{color:var(--muted);font-size:.95rem;line-height:1.55}.review-last{color:var(--muted);font-family:var(--font-mono);letter-spacing:.04em;align-items:center;gap:8px;font-size:11px;display:flex}.review-last .results-verdict{margin-left:0}.review-item-actions{flex-wrap:wrap;gap:8px;display:flex}@media (max-width:900px){.progress-kpis{grid-template-columns:repeat(2,minmax(0,1fr))}.progress-ring-wrap{grid-column:1/-1}}@media (max-width:560px){.results-score{grid-template-columns:repeat(2,minmax(0,1fr))}.results-actions .home-button{flex:140px}.progress-recent-item{grid-template-columns:minmax(0,1fr) auto}.progress-recent-meta{grid-column:1/-1}.review-toolbar{flex-direction:column;align-items:stretch}.review-item-actions{width:100%}.review-item-actions .home-button{flex:120px}}@media (prefers-reduced-motion:reduce){.review-tab{transition:none}}.ref-page{width:100%}.ref-head{max-width:76ch}.ref-head h1{max-width:20ch;font-size:clamp(2.6rem,6.4vw,4.25rem)}.ref-lede{max-width:62ch;color:var(--muted);margin-top:18px;font-size:clamp(1.05rem,1.6vw,1.25rem);line-height:1.6}.ref-note{background:var(--surface);border:var(--rule-width) solid var(--rule);border-left:4px solid var(--copper);max-width:68ch;color:var(--muted);font-family:var(--font-mono);border-radius:0 9px 9px 0;margin-top:22px;padding:13px 16px;font-size:12px;line-height:1.7}.ref-note-inline{background:0 0;border:0;border-radius:0;max-width:44ch;margin-top:0;padding:0;font-size:11.5px}.ref-actions{flex-wrap:wrap;align-items:center;gap:12px 18px;margin-top:26px;display:flex}.ref-back{color:var(--muted);font-family:var(--font-mono);letter-spacing:.04em;align-items:center;gap:7px;margin-bottom:26px;font-size:11.5px;text-decoration:none;display:inline-flex}.ref-back:hover{color:var(--copper)}.ref-grid{grid-template-columns:repeat(auto-fill,minmax(min(100%,280px),1fr));gap:18px;margin-top:38px;display:grid}.ref-grid-notes{grid-template-columns:repeat(auto-fill,minmax(min(100%,310px),1fr))}.ref-card{background:var(--surface);border:var(--rule-width) solid var(--rule);border-radius:var(--radius);box-shadow:var(--shadow);color:var(--ink);transition:transform .13s var(--ease), box-shadow .13s var(--ease), border-color .13s var(--ease);flex-direction:column;gap:10px;padding:20px 20px 18px;text-decoration:none;display:flex}.ref-card:hover{border-color:var(--ink);box-shadow:var(--shadow-hard);transform:translate(-2px,-2px)}.ref-card:focus-visible{outline:2.5px solid var(--copper);outline-offset:3px}.ref-card h2{font-family:var(--font-display);margin:0;font-size:clamp(1.35rem,2.2vw,1.65rem);line-height:1.15}.ref-card p{color:var(--muted);margin:0;font-size:14px;line-height:1.6}.ref-card-kicker{color:var(--copper);font-family:var(--font-mono);letter-spacing:.14em;text-transform:uppercase;font-size:10.5px;font-weight:500}.ref-card-meta{color:var(--muted);font-family:var(--font-mono);letter-spacing:.02em;margin-top:auto;font-size:10.5px}.ref-card-go{color:var(--cobalt);font-family:var(--font-mono);letter-spacing:.06em;text-transform:uppercase;align-items:center;gap:5px;font-size:11px;font-weight:500;display:inline-flex}.note-card:nth-child(3n+1){border-top:4px solid var(--cobalt)}.note-card:nth-child(3n+2){border-top:4px solid var(--copper)}.note-card:nth-child(3n),.lab-card:nth-child(2n){border-top:4px solid var(--acid)}.lab-card:nth-child(odd){border-top:4px solid var(--copper)}.ref-detail{max-width:1040px}.ref-section{margin-top:clamp(32px,5vw,48px);scroll-margin-top:96px}.ref-section h2{font-family:var(--font-display);margin-bottom:14px;font-size:clamp(1.55rem,3vw,2.05rem);line-height:1.15}.ref-prose{max-width:72ch;color:var(--ink);font-size:15.5px;line-height:1.75}.ref-prose+.ref-prose{margin-top:14px}.ref-list{max-width:72ch;color:var(--ink);margin:0;padding-left:1.25em;font-size:14.5px;line-height:1.7}.ref-list li+li{margin-top:7px}.ref-list-traps li::marker{color:var(--hazard)}.ref-list-check li::marker{color:var(--acid)}.ref-list-steps li::marker{color:var(--cobalt);font-family:var(--font-mono);font-weight:600}.ref-two-col{grid-template-columns:repeat(2,minmax(0,1fr));gap:clamp(24px,5vw,48px);display:grid}.formula-list{gap:10px;margin:0;padding:0;list-style:none;display:grid}.formula-list li{background:var(--surface);border:var(--rule-width) solid var(--rule);border-left:4px solid var(--cobalt);border-radius:0 9px 9px 0;padding:12px 16px;font-size:15px;overflow-x:auto}.ref-cta{background:var(--surface-2);border:var(--rule-strong) solid var(--ink);border-radius:var(--radius);box-shadow:var(--shadow-hard);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:18px 28px;margin-top:clamp(36px,5vw,56px);padding:22px 24px;display:flex}.ref-cta h2{font-family:var(--font-display);margin:0 0 4px;font-size:1.5rem}.ref-cta p{color:var(--muted);margin:0;font-size:14px}.ref-pager{border-top:var(--rule-width) solid var(--rule);grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:42px;padding-top:24px;display:grid}.ref-pager-link{background:var(--surface);border:var(--rule-width) solid var(--rule);color:var(--ink);border-radius:10px;flex-direction:column;gap:5px;padding:14px 16px;font-size:13.5px;line-height:1.45;text-decoration:none;display:flex}.ref-pager-link:hover{border-color:var(--copper);color:var(--copper)}.ref-pager-next{text-align:right}.ref-pager-next span:last-child{justify-content:flex-end;align-items:center;gap:5px;display:inline-flex}.ref-pager-label{color:var(--muted);font-family:var(--font-mono);letter-spacing:.12em;text-transform:uppercase;font-size:10px}.formula-toc{background:var(--surface);border:var(--rule-width) solid var(--rule);border-radius:10px;flex-wrap:wrap;gap:7px 14px;margin-top:30px;padding:14px 16px;display:flex}.formula-toc a{color:var(--cobalt);font-family:var(--font-mono);letter-spacing:.03em;text-underline-offset:3px;font-size:11px;text-decoration-thickness:1.5px}.formula-toc a:hover{color:var(--copper)}.formula-section-head{flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:8px 16px;margin-bottom:10px;display:flex}.formula-section-head h2{margin:0}.formula-section-head .badge{text-decoration:none}.formula-section .ref-prose{margin-bottom:20px}.formula-grid{grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr));gap:14px;display:grid}.formula-card{background:var(--surface);border:var(--rule-width) solid var(--rule);min-width:0;box-shadow:var(--shadow);border-radius:11px;flex-direction:column;gap:9px;padding:16px 18px;display:flex}.formula-card h3{color:var(--muted);font-family:var(--font-mono);letter-spacing:.1em;text-transform:uppercase;margin:0;font-size:10.5px;font-weight:500}.formula-expression{color:var(--ink);padding:2px 0;font-size:15px;overflow-x:auto}.formula-expression .tex-display,.formula-expression .katex-display{margin:0}.formula-card p{color:var(--muted);margin:0;font-size:12.5px;line-height:1.55}.formula-table-wrap{border:var(--rule-width) solid var(--rule);background:var(--surface);border-radius:11px;overflow-x:auto}.formula-table{border-collapse:collapse;width:100%;min-width:620px;font-size:13.5px}.formula-table th,.formula-table td{text-align:left;vertical-align:top;border-bottom:var(--rule-width) solid var(--rule);padding:10px 14px}.formula-table thead th{background:var(--surface-2);color:var(--muted);font-family:var(--font-mono);letter-spacing:.1em;text-transform:uppercase;font-size:10px;font-weight:500}.formula-table tbody tr:last-child th,.formula-table tbody tr:last-child td{border-bottom:0}.formula-symbol{font-family:var(--font-mono);white-space:nowrap;font-weight:600}.formula-value{font-family:var(--font-mono);white-space:nowrap;font-size:12.5px}.formula-unit{color:var(--muted);white-space:nowrap}.formula-table-note{color:var(--muted);margin-top:3px;font-size:11.5px;display:block}.rule-grid{grid-template-columns:repeat(auto-fit,minmax(min(100%,280px),1fr));gap:16px;display:grid}.rule-card{background:var(--surface);border:var(--rule-width) solid var(--rule);border-top:4px solid var(--acid);box-shadow:var(--shadow);border-radius:11px;padding:18px 20px}.rule-card h3{font-family:var(--font-display);margin:0 0 10px;font-size:1.25rem}.rule-card .ref-list{font-size:13.5px}.activity-list{counter-reset:activity;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:8px;margin:18px 0 0;padding:0;list-style:none;display:grid}.activity-list li{counter-increment:activity;background:var(--surface);border:var(--rule-width) solid var(--rule);font-family:var(--font-mono);border-radius:8px;align-items:center;gap:9px;padding:8px 12px;font-size:12.5px;display:flex}.activity-list li:before{content:counter(activity);background:var(--surface-2);border:1px solid var(--rule);width:20px;height:20px;color:var(--muted);border-radius:999px;flex:none;place-items:center;font-size:9.5px;display:inline-grid}.periodic-layout{grid-template-columns:minmax(0,1fr) minmax(240px,300px);align-items:start;gap:clamp(20px,3vw,34px);margin-top:32px;display:grid}.periodic-scroll{background:var(--surface);border:var(--rule-width) solid var(--rule);border-radius:var(--radius);min-width:0;box-shadow:var(--shadow);padding:4px 4px 18px;overflow-x:auto}.periodic-grid{grid-template-rows:22px repeat(7,minmax(50px,auto)) 22px minmax(50px,auto) minmax(50px,auto);grid-template-columns:repeat(18,minmax(46px,1fr));gap:4px;min-width:900px;padding:10px;display:grid}.periodic-group-label{color:var(--muted);font-family:var(--font-mono);text-align:center;align-self:center;font-size:9px}.element-cell{background:var(--surface-2);border:1px solid var(--rule);min-height:50px;color:var(--ink);cursor:pointer;text-align:center;transition:transform .1s var(--ease), border-color .1s var(--ease), box-shadow .1s var(--ease);border-radius:5px;flex-direction:column;justify-content:space-between;align-items:stretch;padding:3px 4px 4px;display:flex;overflow:hidden}.element-cell:hover,.element-cell:focus-visible{z-index:1;border-color:var(--ink);box-shadow:var(--shadow-hard);outline:none;transform:translate(-1px,-1px)}.element-cell:focus-visible{outline:2px solid var(--copper);outline-offset:1px}.element-cell[data-selected=true]{border-color:var(--ink);box-shadow:inset 0 0 0 2px var(--ink)}.element-z{font-family:var(--font-mono);opacity:.7;align-self:flex-start;font-size:8.5px;line-height:1}.element-symbol{font-family:var(--font-display);font-size:1.18rem;line-height:1}.element-mass{font-family:var(--font-mono);text-overflow:ellipsis;white-space:nowrap;opacity:.7;font-size:7.5px;line-height:1;overflow:hidden}.periodic-series-marker,.periodic-series-label{background:var(--surface-2);border:1px dashed var(--rule);min-height:50px;color:var(--muted);cursor:pointer;font-family:var(--font-mono);letter-spacing:.04em;border-radius:5px;place-items:center;padding:2px;font-size:9.5px;display:grid}.periodic-series-label{text-transform:uppercase;writing-mode:vertical-rl;border-style:solid;justify-items:start;min-height:50px;padding-left:4px;font-size:8.5px;transform:rotate(180deg)}.periodic-series-marker:hover,.periodic-series-label:hover{color:var(--copper);border-color:var(--copper)}.periodic-series-marker:focus-visible,.periodic-series-label:focus-visible{outline:2px solid var(--copper);outline-offset:1px}.element-cell[data-category=alkali-metal]{background:color-mix(in srgb, var(--copper) 13%, var(--surface-2));border-color:color-mix(in srgb, var(--copper) 32%, var(--rule))}.element-cell[data-category=alkaline-earth-metal]{background:color-mix(in srgb, #d97706 12%, var(--surface-2));border-color:color-mix(in srgb, #d97706 30%, var(--rule))}.element-cell[data-category=transition-metal]{background:color-mix(in srgb, var(--cobalt) 9%, var(--surface-2));border-color:color-mix(in srgb, var(--cobalt) 26%, var(--rule))}.element-cell[data-category=post-transition-metal]{background:color-mix(in srgb, #0f766e 10%, var(--surface-2));border-color:color-mix(in srgb, #0f766e 28%, var(--rule))}.element-cell[data-category=metalloid]{background:color-mix(in srgb, #a16207 13%, var(--surface-2));border-color:color-mix(in srgb, #a16207 30%, var(--rule))}.element-cell[data-category=nonmetal]{background:color-mix(in srgb, var(--acid) 12%, var(--surface-2));border-color:color-mix(in srgb, var(--acid) 30%, var(--rule))}.element-cell[data-category=halogen]{background:color-mix(in srgb, #15803d 14%, var(--surface-2));border-color:color-mix(in srgb, #15803d 32%, var(--rule))}.element-cell[data-category=noble-gas]{background:color-mix(in srgb, #7e22ce 10%, var(--surface-2));border-color:color-mix(in srgb, #7e22ce 28%, var(--rule))}.element-cell[data-category=lanthanide]{background:color-mix(in srgb, #be185d 10%, var(--surface-2));border-color:color-mix(in srgb, #be185d 28%, var(--rule))}.element-cell[data-category=actinide]{background:color-mix(in srgb, #92400e 11%, var(--surface-2));border-color:color-mix(in srgb, #92400e 30%, var(--rule))}.element-panel{background:var(--surface);border:var(--rule-strong) solid var(--ink);border-radius:var(--radius);box-shadow:var(--shadow-hard);padding:22px 22px 20px;position:sticky;top:92px}.element-panel-head{align-items:center;gap:16px;display:flex}.element-panel-symbol{background:var(--surface-2);border:var(--rule-strong) solid var(--ink);width:72px;height:72px;font-family:var(--font-display);border-radius:10px;flex:none;place-items:center;font-size:2.4rem;line-height:1;display:grid}.element-panel-kicker{color:var(--copper);font-family:var(--font-mono);letter-spacing:.12em;text-transform:uppercase;margin:0 0 2px;font-size:9.5px}.element-panel h2{font-family:var(--font-display);margin:0;font-size:1.75rem;line-height:1.1}.element-panel-meta{color:var(--muted);margin:4px 0 0;font-size:11.5px;line-height:1.45}.element-facts{border-top:var(--rule-width) solid var(--rule);border-bottom:var(--rule-width) solid var(--rule);grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:18px 0;padding:14px 0;display:grid}.element-facts dt{color:var(--muted);font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;font-size:9px}.element-facts dd{margin:2px 0 0;font-size:14px;font-weight:500}.element-panel-actions{gap:9px;display:grid}.element-panel-actions .home-button{min-height:40px;padding:8px 12px;font-size:12.5px}.element-panel-note{color:var(--muted);font-family:var(--font-mono);margin:16px 0 0;font-size:10px;line-height:1.6}.periodic-legend{flex-wrap:wrap;gap:8px 16px;margin:26px 0 0;padding:0;list-style:none;display:flex}.periodic-legend li{color:var(--muted);font-family:var(--font-mono);align-items:center;gap:6px;font-size:10px;display:inline-flex}.periodic-legend-swatch{border:1px solid var(--rule);border-radius:3px;width:12px;height:12px}.periodic-legend li[data-category=alkali-metal] .periodic-legend-swatch{background:color-mix(in srgb, var(--copper) 28%, var(--surface-2))}.periodic-legend li[data-category=alkaline-earth-metal] .periodic-legend-swatch{background:color-mix(in srgb, #d97706 28%, var(--surface-2))}.periodic-legend li[data-category=transition-metal] .periodic-legend-swatch{background:color-mix(in srgb, var(--cobalt) 25%, var(--surface-2))}.periodic-legend li[data-category=post-transition-metal] .periodic-legend-swatch{background:color-mix(in srgb, #0f766e 25%, var(--surface-2))}.periodic-legend li[data-category=metalloid] .periodic-legend-swatch{background:color-mix(in srgb, #a16207 28%, var(--surface-2))}.periodic-legend li[data-category=nonmetal] .periodic-legend-swatch{background:color-mix(in srgb, var(--acid) 25%, var(--surface-2))}.periodic-legend li[data-category=halogen] .periodic-legend-swatch{background:color-mix(in srgb, #15803d 28%, var(--surface-2))}.periodic-legend li[data-category=noble-gas] .periodic-legend-swatch{background:color-mix(in srgb, #7e22ce 24%, var(--surface-2))}.periodic-legend li[data-category=lanthanide] .periodic-legend-swatch{background:color-mix(in srgb, #be185d 24%, var(--surface-2))}.periodic-legend li[data-category=actinide] .periodic-legend-swatch{background:color-mix(in srgb, #92400e 26%, var(--surface-2))}.guide-banner{background:color-mix(in srgb, var(--cobalt) 6%, var(--surface));border:var(--rule-width) solid var(--rule);border-left:5px solid var(--cobalt);border-radius:0 10px 10px 0;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px 24px;margin-top:30px;padding:18px 20px;display:flex}.guide-banner p{max-width:74ch;margin:0;font-size:13.5px;line-height:1.65}.guide-banner-date{color:var(--muted);font-family:var(--font-mono);letter-spacing:.04em;font-size:10.5px}.guide-toc{background:var(--surface);border:var(--rule-width) solid var(--rule);border-radius:10px;flex-wrap:wrap;gap:7px 14px;margin-top:22px;padding:14px 16px;display:flex}.guide-toc a{color:var(--cobalt);font-family:var(--font-mono);letter-spacing:.02em;text-underline-offset:3px;font-size:11px;text-decoration-thickness:1.5px}.guide-toc a:hover{color:var(--copper)}.guide-section{border-bottom:var(--rule-width) solid var(--rule);max-width:82ch;padding-bottom:8px}.guide-section:last-child{border-bottom:0}.guide-section-head{flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:8px 16px;margin-bottom:10px;display:flex}.guide-section-head h2{margin:0}.guide-summary{color:var(--copper);font-family:var(--font-mono);margin:0 0 14px;font-size:12px;line-height:1.6}.guide-section .ref-prose+.ref-prose{margin-top:12px}.guide-points{background:var(--surface);border:var(--rule-width) solid var(--rule);border-radius:9px;margin-top:16px;padding:14px 18px 14px 2.1em}.guide-sources{background:var(--surface-2);border-radius:9px;margin-top:18px;padding:14px 18px}.guide-sources h3{color:var(--muted);font-family:var(--font-mono);letter-spacing:.1em;text-transform:uppercase;margin:0 0 8px;font-size:10px;font-weight:500}.guide-sources ul{margin:0;padding-left:1.15em;font-size:12.5px;line-height:1.6}.guide-sources li+li{margin-top:5px}.guide-sources a{color:var(--cobalt);text-underline-offset:2px}.guide-sources span{color:var(--muted)}.audit-grid{grid-template-columns:repeat(auto-fit,minmax(min(45%,150px),1fr));gap:12px;margin-bottom:22px;display:grid}.audit-stat{background:var(--surface);border:var(--rule-width) solid var(--rule);border-top:4px solid var(--cobalt);box-shadow:var(--shadow);border-radius:10px;flex-direction:column;gap:4px;padding:16px 18px;display:flex}.audit-value{font-family:var(--font-display);font-size:2rem;line-height:1}.audit-label{color:var(--muted);font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;font-size:9.5px}.correction-list{gap:8px;margin-top:18px;display:grid}.correction-row{background:var(--surface);border:var(--rule-width) solid var(--rule);border-left:4px solid var(--hazard);border-radius:0 8px 8px 0;grid-template-columns:minmax(120px,auto) minmax(0,1fr);align-items:baseline;gap:8px 16px;padding:10px 14px;font-size:12.5px;line-height:1.55;display:grid}.correction-row code{color:var(--hazard);font-family:var(--font-mono);font-size:11px}.correction-row span{color:var(--muted)}.about-page code{background:var(--surface-2);border:1px solid var(--rule);font-family:var(--font-mono);border-radius:4px;padding:1px 5px;font-size:.9em}.notfound-page .ref-grid{margin-top:34px}.nav-more-menu{position:relative}.nav-more-menu>summary{cursor:pointer;list-style:none}.nav-more-menu>summary::-webkit-details-marker{display:none}.nav-more-menu>summary:after{content:" ▾";font-size:9px}.nav-more-menu[open]>summary{color:var(--copper);border-bottom-color:var(--copper)}.nav-more-panel{z-index:70;background:var(--surface);border:var(--rule-strong) solid var(--ink);min-width:190px;box-shadow:var(--shadow-hard);border-radius:10px;padding:6px;display:grid;position:absolute;top:calc(100% + 12px);right:0}.nav-more-panel a{color:var(--ink);font-family:var(--font-mono);letter-spacing:.04em;white-space:nowrap;border-radius:6px;padding:9px 12px;font-size:11px;text-decoration:none}.nav-more-panel a:hover,.nav-more-panel a[aria-current=page]{background:var(--surface-2);color:var(--copper)}.account-menu{position:relative}.account-menu>summary{cursor:pointer;list-style:none}.account-menu>summary::-webkit-details-marker{display:none}.account-summary{align-items:center;gap:6px;display:inline-flex}.account-menu[open]>summary{color:var(--copper);border-bottom-color:var(--copper)}.account-dot{background:var(--muted);border-radius:50%;width:7px;height:7px}.account-dot-syncing{background:var(--copper);animation:account-pulse .9s var(--ease) infinite alternate}.account-dot-synced{background:var(--acid)}.account-dot-error{background:var(--hazard)}@keyframes account-pulse{0%{opacity:.35}to{opacity:1}}.account-panel{z-index:70;width:min(288px, calc(100vw - 2 * var(--gutter)));background:var(--surface);border:var(--rule-strong) solid var(--ink);box-shadow:var(--shadow-hard);text-align:left;border-radius:10px;gap:10px;padding:14px;display:grid;position:absolute;top:calc(100% + 12px);right:0}.account-body{gap:10px;margin:0;display:grid}.account-heading{color:var(--copper);font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;margin:0;font-size:11px;font-weight:500}.account-copy{color:var(--muted);margin:0;font-size:12px;line-height:1.5}.account-email{color:var(--ink);font-family:var(--font-mono);overflow-wrap:anywhere;margin:0;font-size:12px}.account-status{font-family:var(--font-mono);letter-spacing:.04em;margin:0;font-size:11px}.account-status-offline{color:var(--muted)}.account-status-syncing{color:var(--copper)}.account-status-synced{color:var(--acid)}.account-status-error{color:var(--hazard)}.account-message{background:var(--surface-2);border-left:3px solid var(--copper);color:var(--ink);overflow-wrap:anywhere;border-radius:0 6px 6px 0;margin:0;padding:6px 8px;font-size:12px;line-height:1.5}.account-field{gap:4px;display:grid}.account-field>span{color:var(--muted);font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;font-size:10.5px}.account-field input{background:var(--surface-2);border:var(--rule-width) solid var(--rule);color:var(--ink);font-family:var(--font-ui);border-radius:6px;padding:8px 10px;font-size:13px}.account-field input:focus-visible{border-color:var(--copper);outline:2px solid color-mix(in srgb, var(--copper) 45%, transparent);outline-offset:1px}.account-actions{flex-wrap:wrap;gap:8px;display:flex}.account-button{background:var(--ink);color:var(--paper);cursor:pointer;font-family:var(--font-mono);letter-spacing:.06em;text-transform:uppercase;transition:transform .12s var(--ease), opacity .12s var(--ease);border:none;border-radius:6px;padding:9px 12px;font-size:11px;font-weight:500}.account-button:hover:not(:disabled){transform:translate(-1px,-1px)}.account-button:active:not(:disabled){transform:translate(1px,1px)}.account-button:disabled{cursor:default;opacity:.55}.account-button-quiet{border:var(--rule-width) solid var(--rule);color:var(--ink);background:0 0}.account-switch{color:var(--cobalt);cursor:pointer;text-underline-offset:2px;background:0 0;border:none;justify-self:start;padding:0;font-size:12px;text-decoration:underline}.account-footnote{border-top:1px solid var(--rule);color:var(--muted);margin:0;padding-top:8px;font-size:10.5px;line-height:1.5}@media (max-width:1160px){.periodic-layout{grid-template-columns:minmax(0,1fr)}.element-panel{grid-template-columns:auto minmax(0,1fr);gap:0 24px;display:grid;position:static}.element-panel-head{grid-row:span 2}.element-facts{border-top:0;margin-top:0}.element-panel-actions,.element-panel-note{grid-column:1/-1}}@media (max-width:760px){.ref-two-col,.ref-pager{grid-template-columns:minmax(0,1fr)}.ref-pager-next{text-align:left}.ref-pager-next span:last-child{justify-content:flex-start}.element-panel{grid-template-columns:minmax(0,1fr)}.element-panel-head{grid-row:auto}.element-facts{border-top:var(--rule-width) solid var(--rule)}.audit-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.correction-row{grid-template-columns:minmax(0,1fr)}}@media (max-width:560px){.ref-actions .home-button{flex:160px}.ref-cta .home-button{width:100%}.periodic-legend{gap:6px 12px}.formula-toc,.guide-toc{gap:6px 11px}}@media (prefers-reduced-motion:reduce){.ref-card,.element-cell{transition:none}}@media print{.site-header,.site-footer,.ref-back,.ref-actions,.formula-toc,.guide-toc,.ref-cta,.ref-pager,.periodic-layout,.periodic-legend{display:none!important}.site-main{padding:0}.ref-section{margin-top:20px}.formula-card,.rule-card,.formula-table,.guide-banner,.guide-points{break-inside:avoid;box-shadow:none!important}.formula-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}.update-toast{right:max(16px, calc((100vw - var(--page-max)) / 2));z-index:90;background:var(--surface);border:var(--rule-strong) solid var(--ink);border-radius:var(--radius);width:min(420px,100vw - 32px);box-shadow:var(--shadow-hard);gap:12px;padding:16px 18px;display:grid;position:fixed;bottom:18px}.update-toast p{margin:0;font-size:13px;line-height:1.55}.update-toast-actions{flex-wrap:wrap;gap:8px;display:flex}.update-toast-actions .home-button{min-height:38px;padding:7px 14px;font-size:12.5px}@media (max-width:560px){.update-toast{width:auto;left:16px;right:16px}}.install-prompt{background:var(--surface);border:var(--rule-width) solid var(--ink);box-shadow:var(--shadow-hard);border-radius:7px;align-items:stretch;display:inline-flex}.install-prompt-action{min-height:42px;color:var(--ink);font-family:var(--font-mono);letter-spacing:.09em;text-transform:uppercase;white-space:nowrap;cursor:pointer;transition:background-color .12s var(--ease), color .12s var(--ease);background:0 0;border:0;border-radius:6px 0 0 6px;justify-content:center;align-items:center;gap:7px;padding:0 12px;font-size:11.5px;font-weight:500;display:inline-flex}.install-prompt-action svg{flex:none;width:16px;height:16px}.install-prompt-action:hover{background:var(--surface-2);color:var(--copper)}.install-prompt-dismiss{border:0;border-left:var(--rule-width) solid var(--rule);width:30px;color:var(--muted);cursor:pointer;transition:background-color .12s var(--ease), color .12s var(--ease);background:0 0;border-radius:0 6px 6px 0;place-items:center;padding:0;display:inline-grid}.install-prompt-dismiss svg{width:13px;height:13px}.install-prompt-dismiss:hover{background:var(--surface-2);color:var(--hazard)}@media (max-width:1200px){.install-prompt-action{width:42px;padding:0}.install-prompt-action span{display:none}}@media (max-width:560px){.install-prompt{box-shadow:2px 2px 0 color-mix(in srgb, var(--ink) 20%, transparent)}.install-prompt-action{width:44px;min-height:44px}.install-prompt-dismiss{width:32px}}@media (max-width:980px){.site-header{grid-template-columns:minmax(0,1fr) auto;grid-template-areas:"brand tools""nav nav";align-items:center;gap:0 12px;padding-top:8px}.brand-link{padding-block:4px 2px}.header-tools{padding-block:6px 8px}.site-nav{overscroll-behavior-x:contain;scrollbar-width:none;margin-inline:calc(-1 * var(--gutter));margin-bottom:calc(-1 * var(--rule-strong));padding-inline:var(--gutter);scroll-padding-inline:var(--gutter);justify-content:flex-start;justify-self:stretch;overflow-x:auto}.site-nav::-webkit-scrollbar{display:none}.site-nav a{min-height:44px;padding-inline:12px}.site-nav a:focus-visible{outline-offset:-3px}.nav-more{align-items:center;min-height:44px;display:inline-flex}.account-summary{min-height:44px}}@media (max-width:560px){.brand{gap:9px}.brand-mark{width:29px;height:31px}.brand-name{font-size:1.5rem}.brand-sub{letter-spacing:.15em;font-size:8.5px}.header-tools{gap:8px}.nav-more{font-size:10.5px}.theme-toggle{width:44px;height:44px;box-shadow:2px 2px 0 color-mix(in srgb, var(--ink) 20%, transparent)}.site-nav a{padding-inline:11px;font-size:11px}.site-main{padding-block:26px 64px}.footer-inner{align-items:flex-start}}@media (min-width:1440px){.site-main{padding-block:64px 104px}}