@font-face{font-family:"Source Sans 3 Variable";font-style:normal;font-display:swap;font-weight:200 900;src:url(../media/source-sans-3-cyrillic-ext-wght-normal.3dr-dgdzidi0_.woff2)format("woff2-variations");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:"Source Sans 3 Variable";font-style:normal;font-display:swap;font-weight:200 900;src:url(../media/source-sans-3-cyrillic-wght-normal.2rcjvmmvk3bh-.woff2)format("woff2-variations");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:"Source Sans 3 Variable";font-style:normal;font-display:swap;font-weight:200 900;src:url(../media/source-sans-3-greek-ext-wght-normal.0wpy8o7woho9l.woff2)format("woff2-variations");unicode-range:U+1F??}@font-face{font-family:"Source Sans 3 Variable";font-style:normal;font-display:swap;font-weight:200 900;src:url(../media/source-sans-3-greek-wght-normal.37txlz2jx52f0.woff2)format("woff2-variations");unicode-range:U+370-377,U+37A-37F,U+384-38A,U+38C,U+38E-3A1,U+3A3-3FF}@font-face{font-family:"Source Sans 3 Variable";font-style:normal;font-display:swap;font-weight:200 900;src:url(../media/source-sans-3-vietnamese-wght-normal.0txey9puiotzv.woff2)format("woff2-variations");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:"Source Sans 3 Variable";font-style:normal;font-display:swap;font-weight:200 900;src:url(../media/source-sans-3-latin-ext-wght-normal.1zvx38bd_81k2.woff2)format("woff2-variations");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:"Source Sans 3 Variable";font-style:normal;font-display:swap;font-weight:200 900;src:url(../media/source-sans-3-latin-wght-normal.3y33ar50ixvlj.woff2)format("woff2-variations");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Source Serif 4 Variable";font-style:normal;font-display:swap;font-weight:200 900;src:url(../media/source-serif-4-cyrillic-ext-wght-normal.2kae4mag_ci76.woff2)format("woff2-variations");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:"Source Serif 4 Variable";font-style:normal;font-display:swap;font-weight:200 900;src:url(../media/source-serif-4-cyrillic-wght-normal.3xa2i83o_snvh.woff2)format("woff2-variations");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:"Source Serif 4 Variable";font-style:normal;font-display:swap;font-weight:200 900;src:url(../media/source-serif-4-greek-wght-normal.2o0sqdvwgj5-x.woff2)format("woff2-variations");unicode-range:U+370-377,U+37A-37F,U+384-38A,U+38C,U+38E-3A1,U+3A3-3FF}@font-face{font-family:"Source Serif 4 Variable";font-style:normal;font-display:swap;font-weight:200 900;src:url(../media/source-serif-4-vietnamese-wght-normal.0j5w2zedxs_uw.woff2)format("woff2-variations");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:"Source Serif 4 Variable";font-style:normal;font-display:swap;font-weight:200 900;src:url(../media/source-serif-4-latin-ext-wght-normal.36uylrv_m5wdg.woff2)format("woff2-variations");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:"Source Serif 4 Variable";font-style:normal;font-display:swap;font-weight:200 900;src:url(../media/source-serif-4-latin-wght-normal.3_g1pg7bqcyap.woff2)format("woff2-variations");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-display:block;font-family:KaTeX_AMS;font-style:normal;font-weight:400;src:url(../media/KaTeX_AMS-Regular.25ieegmnh38ts.woff2)format("woff2"),url(../media/KaTeX_AMS-Regular.10y3kupq4t663.woff)format("woff"),url(../media/KaTeX_AMS-Regular.418dr7cz3fo2x.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Caligraphic;font-style:normal;font-weight:700;src:url(../media/KaTeX_Caligraphic-Bold.06b-ya9t43ioz.woff2)format("woff2"),url(../media/KaTeX_Caligraphic-Bold.2vmk2hva4ctha.woff)format("woff"),url(../media/KaTeX_Caligraphic-Bold.40ltxhe834pns.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Caligraphic;font-style:normal;font-weight:400;src:url(../media/KaTeX_Caligraphic-Regular.2eph4dlhid_m9.woff2)format("woff2"),url(../media/KaTeX_Caligraphic-Regular.3gxeetazf831f.woff)format("woff"),url(../media/KaTeX_Caligraphic-Regular.07-7u27-nhn_r.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Fraktur;font-style:normal;font-weight:700;src:url(../media/KaTeX_Fraktur-Bold.2sasz-d-jtw8y.woff2)format("woff2"),url(../media/KaTeX_Fraktur-Bold.1alcy76__wdj2.woff)format("woff"),url(../media/KaTeX_Fraktur-Bold.19yqa_tc9d_gx.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Fraktur;font-style:normal;font-weight:400;src:url(../media/KaTeX_Fraktur-Regular.2d10y4xmjvzlf.woff2)format("woff2"),url(../media/KaTeX_Fraktur-Regular.110oo81prr9n5.woff)format("woff"),url(../media/KaTeX_Fraktur-Regular.2qhy34r6a05dn.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:normal;font-weight:700;src:url(../media/KaTeX_Main-Bold.3-rowy8o6_4ky.woff2)format("woff2"),url(../media/KaTeX_Main-Bold.0v1esh257kqpe.woff)format("woff"),url(../media/KaTeX_Main-Bold.0us_n0tnxlxu7.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:italic;font-weight:700;src:url(../media/KaTeX_Main-BoldItalic.14r2naom8mrec.woff2)format("woff2"),url(../media/KaTeX_Main-BoldItalic.13355ck5zr48q.woff)format("woff"),url(../media/KaTeX_Main-BoldItalic.3x_u9cepaced0.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:italic;font-weight:400;src:url(../media/KaTeX_Main-Italic.0lig0v9j0700p.woff2)format("woff2"),url(../media/KaTeX_Main-Italic.0afv392dj4w59.woff)format("woff"),url(../media/KaTeX_Main-Italic.2hkw3230mfwcv.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Main;font-style:normal;font-weight:400;src:url(../media/KaTeX_Main-Regular.1ryvsdzh2w1_e.woff2)format("woff2"),url(../media/KaTeX_Main-Regular.15u8r3b2y7fv4.woff)format("woff"),url(../media/KaTeX_Main-Regular.0symfa7dqj6jd.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Math;font-style:italic;font-weight:700;src:url(../media/KaTeX_Math-BoldItalic.1oopuu636h4il.woff2)format("woff2"),url(../media/KaTeX_Math-BoldItalic.12pl58orkw9rg.woff)format("woff"),url(../media/KaTeX_Math-BoldItalic.0y5w36a5aq__2.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Math;font-style:italic;font-weight:400;src:url(../media/KaTeX_Math-Italic.32405s1aq8vas.woff2)format("woff2"),url(../media/KaTeX_Math-Italic.0w0b1ugh62cfr.woff)format("woff"),url(../media/KaTeX_Math-Italic.2vkekfblmz5nb.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:normal;font-weight:700;src:url(../media/KaTeX_SansSerif-Bold.0h3wi2z_eouyg.woff2)format("woff2"),url(../media/KaTeX_SansSerif-Bold.1ovw5p-yjp56g.woff)format("woff"),url(../media/KaTeX_SansSerif-Bold.2d03q85pwxpti.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:italic;font-weight:400;src:url(../media/KaTeX_SansSerif-Italic.0wkjc4dm2kcit.woff2)format("woff2"),url(../media/KaTeX_SansSerif-Italic.1qavw__2zz8gk.woff)format("woff"),url(../media/KaTeX_SansSerif-Italic.3i-q087b23-m8.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_SansSerif;font-style:normal;font-weight:400;src:url(../media/KaTeX_SansSerif-Regular.2peiewu59z3d-.woff2)format("woff2"),url(../media/KaTeX_SansSerif-Regular.1i4afx8nk8n4r.woff)format("woff"),url(../media/KaTeX_SansSerif-Regular.31pbu25feko_c.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Script;font-style:normal;font-weight:400;src:url(../media/KaTeX_Script-Regular.11h14300o9pd0.woff2)format("woff2"),url(../media/KaTeX_Script-Regular.3110jb9c-bxna.woff)format("woff"),url(../media/KaTeX_Script-Regular.28p_x7iz71ofe.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size1;font-style:normal;font-weight:400;src:url(../media/KaTeX_Size1-Regular.03lhvx36ekcou.woff2)format("woff2"),url(../media/KaTeX_Size1-Regular.1slf4bh0hc6vm.woff)format("woff"),url(../media/KaTeX_Size1-Regular.1y57-ck23ey8c.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size2;font-style:normal;font-weight:400;src:url(../media/KaTeX_Size2-Regular.14s5gg-puz6h-.woff2)format("woff2"),url(../media/KaTeX_Size2-Regular.0-kwyvx03omo8.woff)format("woff"),url(../media/KaTeX_Size2-Regular.2u0s-b07k2o9m.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size3;font-style:normal;font-weight:400;src:url(../media/KaTeX_Size3-Regular.1n1rgzz84z8r9.woff2)format("woff2"),url(../media/KaTeX_Size3-Regular.04o9a_02gu_e8.woff)format("woff"),url(../media/KaTeX_Size3-Regular.1pkn-dge4q0fv.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Size4;font-style:normal;font-weight:400;src:url(../media/KaTeX_Size4-Regular.2sgotkdv3dcyv.woff2)format("woff2"),url(../media/KaTeX_Size4-Regular.3p2r1l7xmebxv.woff)format("woff"),url(../media/KaTeX_Size4-Regular.2uelkfk2yna5e.ttf)format("truetype")}@font-face{font-display:block;font-family:KaTeX_Typewriter;font-style:normal;font-weight:400;src:url(../media/KaTeX_Typewriter-Regular.11gr2d2wuwz77.woff2)format("woff2"),url(../media/KaTeX_Typewriter-Regular.12f8myjij3617.woff)format("woff"),url(../media/KaTeX_Typewriter-Regular.3nee9kjfy6nm8.ttf)format("truetype")}.katex{text-indent:0;text-rendering:auto;font:1.21em/1.2 KaTeX_Main,Times New Roman,serif;position:relative}.katex *{border-color:currentColor;-ms-high-contrast-adjust:none!important}.katex .katex-version:after{content:"0.18.1"}.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 .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:#f4f0e7;--surface:#fffdf8;--surface-2:#ebe6da;--ink:#172235;--muted:#647081;--line:#d8d1c2;--accent:#285c86;--accent-2:#183f61;--good:#1d6b4c;--bad:#a13d39;--focus:#ea9c35;--shadow:0 8px 30px #27303a14}:root[data-theme=dark]{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--paper:#101720;--surface:#17212d;--surface-2:#202c39;--ink:#edf1f5;--muted:#a9b3bf;--line:#354252;--accent:#82b9e3;--accent-2:#b8d9f2;--good:#73cda5;--bad:#f09a94;--focus:#ffbd69;--shadow:0 8px 30px #0000003d}@media (prefers-color-scheme:dark){:root[data-theme=system]{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--paper:#101720;--surface:#17212d;--surface-2:#202c39;--ink:#edf1f5;--muted:#a9b3bf;--line:#354252;--accent:#82b9e3;--accent-2:#b8d9f2;--good:#73cda5;--bad:#f09a94;--focus:#ffbd69;--shadow:0 8px 30px #0000003d}}*{box-sizing:border-box}html,body{background:var(--paper);min-height:100%;color:var(--ink);margin:0;font-family:"Source Sans 3 Variable",system-ui,sans-serif}button,input,select,textarea{font:inherit;color:inherit}button,a,input,select,textarea{outline:none}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid var(--focus);outline-offset:2px}button{cursor:pointer}p{line-height:1.55}.practice-shell{min-height:100vh}.practice-header{border-bottom:1px solid var(--line);background:color-mix(in srgb,var(--surface) 90%,transparent);z-index:5;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);justify-content:space-between;align-items:center;height:76px;padding:12px 28px;display:flex;position:sticky;top:0}.product-name{color:var(--accent);letter-spacing:.07em;text-transform:uppercase;margin:0;font-size:12px;font-weight:760}.practice-header h1{margin:2px 0 0;font-family:"Source Serif 4 Variable",serif;font-size:25px;line-height:1}.header-actions{align-items:center;gap:10px;display:flex}.mode-chip,.sync-chip,.account-link{border:1px solid var(--line);border-radius:4px;padding:6px 9px;font-size:12px;text-decoration:none}.mode-chip{color:var(--accent);font-weight:800}.sync-chip[data-status=offline]{color:var(--bad)}.practice-grid{grid-template-columns:220px minmax(420px,760px) 300px;gap:24px;max-width:1360px;margin:auto;padding:28px;display:grid}.filter-rail,.activity-rail{align-self:start;position:sticky;top:104px}.filter-rail,.notes-panel,.stats-panel,.recent-panel,.settings-panel{background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:16px}.filter-rail h2,.activity-rail h2{margin:0 0 14px;font-family:"Source Serif 4 Variable",serif;font-size:17px}.filter-rail label,.timezone-field{color:var(--muted);gap:5px;margin-bottom:12px;font-size:13px;display:grid}.filter-rail select,.timezone-field input,.auth-card input{background:var(--paper);border:1px solid var(--line);border-radius:4px;width:100%;padding:9px}.primary-button,.secondary-button{border-radius:4px;padding:9px 14px;font-weight:700;transition:background-color .18s,border-color .18s,transform .18s}.primary-button{border:1px solid var(--accent-2);background:var(--accent-2);color:var(--surface)}.secondary-button{border:1px solid var(--line);background:var(--surface)}.primary-button:hover,.secondary-button:hover{transform:translateY(-1px)}button:disabled{opacity:.48;cursor:not-allowed;transform:none}.filter-rail>.secondary-button{width:100%}.limit-meter{border-top:1px solid var(--line);margin-top:16px;padding-top:14px}.limit-meter div{justify-content:space-between;font-size:13px;display:flex}.limit-meter progress{width:100%;accent-color:var(--accent)}.question-paper{background:var(--surface);border:1px solid var(--line);min-height:720px;box-shadow:var(--shadow);border-radius:7px;padding:32px}.question-meta{flex-wrap:wrap;gap:6px;display:flex}.question-meta span{color:var(--muted);border-right:1px solid var(--line);padding-right:7px;font-size:12px}.question-heading{grid-template-columns:44px 1fr;gap:14px;margin:26px 0 10px;display:grid}.question-number{color:var(--accent);font-family:"Source Serif 4 Variable",serif;font-size:32px}.development-label{text-transform:uppercase;letter-spacing:.08em;color:var(--good);margin:0;font-size:11px;font-weight:750}.stem{margin:8px 0;font-family:"Source Serif 4 Variable",serif;font-size:20px;line-height:1.65}.translation-toggle{color:var(--accent);background:0 0;border:0;padding:5px 0}.translated-stem,.stimulus{border-left:3px solid var(--accent);background:var(--paper);padding:10px 14px}.stimulus h2{font-size:15px}.question-table{border-collapse:collapse;width:100%;margin:18px 0}.question-table caption{text-align:left;margin-bottom:6px;font-weight:700}.question-table th,.question-table td{border:1px solid var(--line);text-align:center;padding:9px}.question-graph{width:100%;max-width:520px;color:var(--ink);margin:18px auto;display:block}.graph-wrap{margin:18px 0}.graph-wrap svg{width:100%;max-width:520px;color:var(--ink);margin:auto;display:block}.graph-axis{stroke:var(--muted);stroke-width:1.3px}.graph-midline{stroke:var(--line);stroke-width:1.2px;stroke-dasharray:6 5}.graph-curve{fill:none;stroke:var(--accent-2);stroke-width:3px;stroke-linecap:round;stroke-linejoin:round}.graph-wrap text{fill:var(--muted);font-size:12px}.graph-wrap figcaption{max-width:520px;color:var(--muted);margin:8px auto 0;font-size:13px}.inline-help,.calculator-guide{border-top:1px solid var(--line);margin-top:15px;padding:10px 0}.inline-help summary,.calculator-guide summary,.feedback summary{cursor:pointer;color:var(--accent);font-weight:700}.options{border:0;gap:9px;margin:24px 0;padding:0;display:grid}.option{border:1px solid var(--line);cursor:pointer;border-radius:5px;grid-template-columns:20px 31px 1fr;align-items:center;gap:8px;padding:13px;display:grid}.option:hover,.option.selected{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 7%,var(--surface))}.option.correct{border-color:var(--good)}.option.incorrect{border-color:var(--bad)}.option-label{font-family:"Source Serif 4 Variable",serif;font-weight:800}.hint-stack{gap:7px;display:grid}.hint{background:var(--paper);grid-template-columns:25px 1fr;gap:8px;padding:9px;display:grid}.hint>span{color:var(--accent);font-weight:800}.hint-body{min-width:0;margin:0}.question-actions{justify-content:space-between;margin-top:18px;display:flex}.status-message{color:var(--muted)}.question-empty{justify-items:start;gap:14px;padding:8px 0;display:grid}.question-empty p{color:var(--muted);margin:0}.limit-notice{border:1px solid var(--focus);margin-top:18px;padding:14px}.feedback{border-top:3px solid var(--good);margin-top:24px;padding-top:16px}.feedback.is-incorrect{border-color:var(--bad)}.feedback h2,.feedback h3{font-family:"Source Serif 4 Variable",serif}.feedback details{background:var(--paper);padding:14px}.secondary-language{color:var(--muted)}.option-reasons div{border-top:1px solid var(--line);grid-template-columns:30px 1fr;padding:7px;display:grid}.option-reasons dt{font-weight:800}.option-reasons dd{margin:0}.activity-rail{gap:14px;display:grid}.section-heading{justify-content:space-between;align-items:center;gap:8px;display:flex}.section-heading h2{margin:0}.section-heading>span{color:var(--muted);font-size:12px}.bookmark{border:1px solid var(--line);background:0 0;border-radius:4px;padding:5px 8px}.bookmark.active{color:var(--good);border-color:var(--good)}.notes-panel textarea{resize:vertical;background:var(--paper);border:1px solid var(--line);width:100%;min-height:90px;margin-top:12px;padding:9px}.notes-panel small,.stats-disclaimer,.sample-line{color:var(--muted);font-size:12px}.stat-grid{grid-template-columns:1fr 1fr;gap:8px;display:grid}.stat-grid div{background:var(--paper);padding:9px}.stat-grid dt{color:var(--muted);font-size:11px}.stat-grid dd{margin:0;font-family:"Source Serif 4 Variable",serif;font-size:22px}.distribution{font-size:12px}.distribution div{border-bottom:1px solid var(--line);justify-content:space-between;padding:4px;display:flex}.recent-panel ol{padding:0;list-style:none}.recent-panel li{border-bottom:1px solid var(--line);grid-template-columns:1fr auto;margin:8px 0;padding-bottom:7px;display:grid}.recent-panel small{color:var(--muted);grid-column:1/-1}.setting-row{margin:12px 0}.setting-row>span,.timezone-field>span{color:var(--muted);margin-bottom:5px;font-size:12px;display:block}.segmented{grid-template-columns:1fr 1fr;display:grid}.segmented-three{grid-template-columns:repeat(3,1fr)}.segmented button{border:1px solid var(--line);background:var(--paper);padding:6px 3px;font-size:12px}.segmented button.active{background:var(--accent-2);color:var(--surface);border-color:var(--accent-2)}.setting-note{color:var(--muted);font-size:12px}.auth-shell{place-items:center;min-height:100vh;padding:32px;display:grid}.back-link{color:var(--accent);position:absolute;top:24px;left:28px}.auth-card{background:var(--surface);border:1px solid var(--line);width:min(440px,100%);box-shadow:var(--shadow);padding:32px}.auth-card h1{font-family:"Source Serif 4 Variable",serif}.auth-card form,.auth-card label{gap:10px;margin:22px 0;display:grid}.auth-card>.secondary-button{width:100%}.sr-only{clip:rect(0,0,0,0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.katex-display{padding:4px;overflow:auto hidden}@media (max-width:1050px){.practice-grid{grid-template-columns:180px 1fr}.activity-rail{grid-column:1/-1;grid-template-columns:repeat(2,1fr);position:static}.settings-panel{grid-column:1/-1}}@media (max-width:680px){.practice-header{height:auto;min-height:68px;padding:10px 14px}.practice-header h1{font-size:19px}.mode-chip{display:none}.sync-chip{text-overflow:ellipsis;white-space:nowrap;max-width:118px;overflow:hidden}.practice-grid{padding:10px;display:block}.filter-rail,.activity-rail{position:static}.filter-rail{grid-template-columns:repeat(3,minmax(0,1fr));gap:7px;margin-bottom:10px;padding:10px;display:grid}.filter-rail h2,.filter-rail>.secondary-button,.limit-meter{grid-column:1/-1}.filter-rail label{min-width:0;margin:0}.filter-rail select{width:100%;min-width:0;padding:7px 3px}.question-paper{min-height:0;padding:18px 14px}.question-heading{grid-template-columns:32px 1fr;gap:8px;margin-top:18px}.question-number{font-size:25px}.stem{font-size:18px}.question-meta span{font-size:10px}.option{grid-template-columns:18px 27px minmax(0,1fr);padding:11px 8px}.question-actions{gap:8px}.question-actions button{flex:1}.activity-rail{grid-template-columns:1fr;margin-top:10px;display:grid}.auth-shell{padding:14px}.auth-card{padding:22px}.practice-shell,.practice-grid,.question-paper,.activity-rail{max-width:100%;overflow-x:hidden}}@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}.skip-link{z-index:50;background:var(--ink);color:var(--surface);padding:10px 14px;position:fixed;top:-60px;left:16px}.skip-link:focus{top:12px}.public-shell{background:var(--paper);min-height:100vh}.public-header{border-bottom:1px solid var(--line);background:color-mix(in srgb,var(--surface) 93%,transparent);z-index:20;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);grid-template-columns:minmax(210px,1fr) auto minmax(210px,1fr);align-items:center;gap:24px;min-height:82px;padding:13px clamp(18px,4vw,64px);display:grid;position:sticky;top:0}.public-brand{color:var(--ink);align-items:center;gap:11px;font-family:"Source Serif 4 Variable",serif;font-size:18px;font-weight:700;text-decoration:none;display:flex}.public-brand__mark{border:1px solid var(--ink);place-items:center;width:39px;height:39px;font-size:24px;font-style:italic;display:grid}.public-brand small{color:var(--muted);text-transform:uppercase;letter-spacing:.14em;font-family:"Source Sans 3 Variable",sans-serif;font-size:10px;display:block}.public-header nav{gap:clamp(14px,2.4vw,34px);display:flex}.public-header nav a,.public-header__actions a{color:var(--ink);font-size:14px;text-decoration:none}.public-header nav a:hover,.locale-switch:hover{text-underline-offset:5px;text-decoration:underline}.public-header__actions{justify-self:end;align-items:center;gap:13px;display:flex}.public-cta{background:var(--ink);border:1px solid var(--ink);justify-content:center;align-items:center;min-height:42px;font-weight:700;text-decoration:none;transition:transform .18s,background-color .18s;display:inline-flex;color:var(--surface)!important;padding:9px 16px!important}.public-cta:hover{transform:translateY(-2px)}.public-footer{border-top:1px solid var(--line);color:var(--muted);justify-content:space-between;gap:30px;margin-top:100px;padding:30px clamp(18px,5vw,80px);display:flex}.public-footer p{max-width:700px;margin:0}.public-footer div{gap:18px;display:flex}.public-footer a{color:var(--ink)}.public-kicker{color:var(--accent);letter-spacing:.13em;text-transform:uppercase;margin:0 0 12px;font-size:12px;font-weight:800}.public-hero{border-bottom:1px solid var(--line);background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-position:-1px -1px;background-size:32px 32px;padding:clamp(74px,10vw,150px) clamp(20px,8vw,130px) clamp(64px,9vw,118px)}.public-hero>*{max-width:1050px}.public-hero h1{letter-spacing:-.052em;text-wrap:balance;margin:0;font-family:"Source Serif 4 Variable",serif;font-size:clamp(46px,7.6vw,112px);font-weight:520;line-height:.97}.public-hero__lede{max-width:760px;color:var(--muted);text-wrap:pretty;margin:31px 0 0;font-size:clamp(18px,2.1vw,25px);line-height:1.52}.hero-actions{align-items:center;gap:22px;margin-top:34px;display:flex}.hero-actions>a:not(.public-cta){color:var(--ink);text-underline-offset:5px}.editorial-grid{border-left:1px solid var(--line);grid-template-columns:repeat(3,1fr);max-width:1320px;margin:auto;display:grid}.editorial-grid article{border-right:1px solid var(--line);padding:54px 36px}.editorial-grid span,.sample-card>span,.unit-ledger span,.exam-ledger span{font-variant-numeric:tabular-nums;color:var(--accent);letter-spacing:.12em;font-size:12px}.editorial-grid h2{font-family:"Source Serif 4 Variable",serif;font-size:28px;font-weight:580}.editorial-grid p{color:var(--muted)}.public-section{max-width:1320px;margin:110px auto;padding:0 36px}.section-title{grid-template-columns:1fr 2fr;align-items:end;margin-bottom:36px;display:grid}.section-title h2{letter-spacing:-.035em;margin:0;font-family:"Source Serif 4 Variable",serif;font-size:clamp(36px,5vw,68px);font-weight:520}.sample-grid{border-top:1px solid var(--line);border-left:1px solid var(--line);grid-template-columns:repeat(3,1fr);display:grid}.sample-card{border-right:1px solid var(--line);border-bottom:1px solid var(--line);min-height:210px;color:var(--ink);padding:26px;text-decoration:none;transition:background-color .18s,transform .18s}.sample-card:hover{background:var(--surface);transform:translateY(-2px)}.sample-card p{color:var(--muted);margin:30px 0 6px;font-size:12px}.sample-card h3{margin:0 0 20px;font-family:"Source Serif 4 Variable",serif;font-size:23px}.sample-card small{color:var(--muted);text-transform:capitalize}.unit-ledger{max-width:1240px;margin:90px auto}.unit-ledger>a{border-bottom:1px solid var(--line);color:var(--ink);grid-template-columns:140px 1fr auto;align-items:center;gap:30px;padding:42px 24px;text-decoration:none;display:grid}.unit-ledger>a:first-child{border-top:1px solid var(--line)}.unit-ledger h2{margin:0;font-family:"Source Serif 4 Variable",serif;font-size:clamp(26px,3vw,42px);font-weight:540}.unit-ledger p{color:var(--muted)}.public-prose{max-width:880px;font-size:19px}.public-prose h2{font-family:"Source Serif 4 Variable",serif;font-size:42px;font-weight:550}.public-prose li{padding:7px 0}.knowledge-layout{grid-template-columns:210px minmax(0,820px) 240px;gap:42px;max-width:1450px;margin:0 auto;padding:60px 34px;display:grid}.knowledge-toc,.knowledge-index{align-self:start;position:sticky;top:120px}.knowledge-toc{gap:13px;display:grid}.knowledge-toc a{color:var(--muted);border-bottom:1px solid var(--line);padding-bottom:10px;text-decoration:none}.knowledge-toc a:hover{color:var(--ink)}.knowledge-index{border-left:1px solid var(--line);padding-left:24px}.knowledge-index .katex-display{font-size:.8em}.knowledge-index dl{font-size:13px}.knowledge-index dt{color:var(--muted);margin-top:16px}.knowledge-index dd{word-break:break-word;margin:4px 0}.knowledge-article .public-hero{background:0 0;padding:58px 0}.knowledge-article .public-hero h1{font-size:clamp(48px,6vw,78px)}.knowledge-article>section{border-top:1px solid var(--line);padding:58px 0;scroll-margin-top:120px;font-size:18px}.knowledge-article>section h2{font-family:"Source Serif 4 Variable",serif;font-size:34px;font-weight:560}.comparison-note{border:1px solid var(--line);background:var(--surface);margin-top:32px;padding:24px}.bilingual-derivation{border-left:3px solid var(--accent);background:var(--surface);color:var(--muted);padding:20px}.representation{border:1px solid var(--line);background:var(--surface)}.representation__heading{border-bottom:1px solid var(--line);justify-content:space-between;gap:18px;padding:24px;display:flex}.representation__heading h2{margin:0!important;font-size:26px!important}.representation__tabs{grid-template-columns:repeat(2,1fr);min-width:230px;display:grid}.representation__tabs button{border:1px solid var(--line);background:var(--paper);margin:-1px 0 0 -1px;padding:8px}.representation__tabs button[aria-selected=true]{background:var(--ink);color:var(--surface)}.representation__stage{place-items:center;min-height:330px;padding:28px;display:grid}.representation__equation{max-width:100%;font-size:clamp(18px,3vw,30px);overflow:hidden}.representation__context{max-width:540px;font-family:"Source Serif 4 Variable",serif;font-size:24px;line-height:1.55}.representation__graph{width:100%;margin:0}.representation__graph svg{width:100%;color:var(--ink)}.representation__graph text{fill:var(--muted);font-size:12px}.graph-point{fill:var(--accent)}.representation__proof{border-top:1px solid var(--line);color:var(--muted);margin:0;padding:14px 24px;font-size:13px}.public-table{border-collapse:collapse;min-width:330px}.public-table th,.public-table td{border:1px solid var(--line);text-align:center;padding:10px 24px}.exam-ledger{border:1px solid var(--line);grid-template-columns:1fr 1fr;max-width:1080px;margin:90px auto;display:grid}.exam-ledger article{padding:50px}.exam-ledger article+article{border-left:1px solid var(--line)}.exam-ledger h2{margin:20px 0 0;font-family:"Source Serif 4 Variable",serif;font-size:68px}.calculator-paths{max-width:1120px;margin:90px auto}.calculator-paths article{border-bottom:1px solid var(--line);grid-template-columns:140px 1.5fr 1fr;gap:30px;padding:34px 20px;display:grid}.calculator-paths h2{margin:0;font-family:"Source Serif 4 Variable",serif;font-size:24px;font-weight:540}.calculator-paths p{margin:0}.glossary{max-width:1180px;margin:80px auto}.glossary article{border-bottom:1px solid var(--line);grid-template-columns:240px 1fr 1fr;gap:30px;padding:38px 20px;scroll-margin-top:110px;display:grid}.glossary article:first-child{border-top:1px solid var(--line)}.glossary h2{text-transform:lowercase;margin:0;font-family:"Source Serif 4 Variable",serif;font-size:34px}.glossary header p{color:var(--accent)}.glossary h3{text-transform:uppercase;letter-spacing:.1em;color:var(--muted);font-size:12px}.sample-page{max-width:1020px;margin:0 auto;padding:40px 28px}.sample-breadcrumb{color:var(--muted);align-items:center;gap:9px;margin-bottom:42px;font-size:13px;display:flex}.sample-breadcrumb a{color:var(--ink)}.sample-question{background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);padding:clamp(24px,5vw,66px)}.sample-question__meta{color:var(--muted);flex-wrap:wrap;gap:9px;font-size:12px;display:flex}.sample-question__meta span{border-right:1px solid var(--line);padding-right:9px}.sample-question__stem{margin:42px 0 20px;font-family:"Source Serif 4 Variable",serif;font-size:clamp(24px,3vw,38px);font-weight:520;line-height:1.5}.sample-question__translation{border-left:3px solid var(--accent);background:var(--paper);padding:18px;font-size:17px}.public-stimulus{border:1px solid var(--line);background:var(--paper);margin:32px 0;padding:24px}.public-stimulus h2{font-family:"Source Serif 4 Variable",serif}.sample-options{gap:10px;margin:34px 0;padding-left:40px;display:grid}.sample-options li{border-bottom:1px solid var(--line);padding:13px 16px}.sample-options li::marker{font-family:"Source Serif 4 Variable",serif;font-weight:800}.sample-options .is-answer{border-color:var(--good);background:color-mix(in srgb,var(--good) 7%,var(--surface))}.sample-solution{border-top:3px solid var(--good);margin-top:54px;padding-top:30px}.sample-solution h2,.sample-solution h3{font-family:"Source Serif 4 Variable",serif}.sample-solution>ol li{padding:7px}.sample-reasons>div{border-top:1px solid var(--line);grid-template-columns:38px 1fr;padding:12px 0;display:grid}.sample-reasons dt{font-weight:800}.sample-reasons dd{margin:0}.review-stamp{border-top:1px solid var(--line);color:var(--muted);flex-wrap:wrap;gap:18px;margin-top:42px;padding-top:18px;font-size:12px;display:flex}.language-gate{text-align:center;place-content:center;min-height:100vh;padding:24px;display:grid}.language-gate h1{margin:0;font-family:"Source Serif 4 Variable",serif;font-size:clamp(38px,7vw,78px)}.language-gate__links{justify-content:center;gap:12px;margin-top:24px;display:flex}.language-gate__links a{border:1px solid var(--ink);min-width:120px;color:var(--ink);padding:12px;text-decoration:none}.language-gate__links a:first-child{background:var(--ink);color:var(--surface)}@media (max-width:1100px){.public-header{grid-template-columns:1fr auto}.public-header nav{border-top:1px solid var(--line);grid-area:2/1/auto/-1;justify-content:center;padding-top:10px}.knowledge-layout{grid-template-columns:160px minmax(0,1fr)}.knowledge-index{display:none}.sample-grid{grid-template-columns:repeat(2,1fr)}}@media (max-width:720px){.public-header{flex-wrap:wrap;gap:12px;padding:12px 14px;display:flex;position:static}.public-brand{margin-right:auto}.public-header nav{order:3;justify-content:flex-start;width:100%;padding:10px 0 0;overflow-x:auto}.public-header nav a{white-space:nowrap}.public-header__actions .locale-switch{font-size:12px}.public-header__actions .public-cta{min-height:38px;padding:7px 10px!important}.public-hero{padding:68px 18px}.public-hero h1{font-size:clamp(45px,15vw,70px)}.hero-actions{flex-direction:column;align-items:flex-start}.editorial-grid,.sample-grid,.exam-ledger{grid-template-columns:1fr}.editorial-grid,.sample-grid{border-left:0}.editorial-grid article,.sample-card{border-left:1px solid var(--line)}.public-section{margin:72px auto;padding:0 18px}.section-title{grid-template-columns:1fr;gap:10px}.unit-ledger{margin:55px 18px}.unit-ledger>a{grid-template-columns:1fr;gap:10px;padding:30px 8px}.knowledge-layout{padding:20px 16px;display:block}.knowledge-toc{margin-bottom:24px;display:flex;position:static;overflow-x:auto}.knowledge-toc a{white-space:nowrap}.knowledge-article .public-hero{padding-top:30px}.knowledge-article>section{padding:42px 0}.representation__heading{display:block}.representation__tabs{min-width:0;margin-top:18px}.representation__stage{min-height:290px;padding:12px}.representation__equation{font-size:15px}.representation__context{font-size:19px}.exam-ledger{margin:55px 18px}.exam-ledger article+article{border-left:0;border-top:1px solid var(--line)}.calculator-paths,.glossary{margin:55px 18px}.calculator-paths article,.glossary article{grid-template-columns:1fr;gap:10px;padding:28px 0}.sample-page{padding:24px 10px}.sample-question{padding:23px 14px}.sample-question__stem{font-size:24px}.sample-breadcrumb{white-space:nowrap;overflow-x:auto}.review-stamp,.public-footer{display:grid}.public-footer{margin-top:60px;padding:24px 18px}.public-footer div{display:grid}.table-scroll{max-width:100%;overflow-x:auto}.public-shell,.sample-page,.knowledge-layout{max-width:100%;overflow-x:hidden}}.frq-preview{max-width:1020px}.frq-preview__header{margin-bottom:38px}.frq-preview__header h1{margin:0 0 12px;font-family:"Source Serif 4 Variable",serif;font-size:clamp(30px,4vw,52px)}.frq-preview__header p{color:var(--muted);max-width:760px}.frq-preview__header nav{flex-wrap:wrap;gap:10px;margin-top:16px;display:flex}.frq-preview__header nav a{color:var(--accent);border:1px solid var(--line);padding:5px 9px;font-size:13px;text-decoration:none}.frq-preview__question{margin-bottom:44px}.frq-preview__title{margin:26px 0 4px;font-family:"Source Serif 4 Variable",serif;font-size:clamp(23px,3vw,34px)}.frq-preview__subtitle{color:var(--muted);margin:0 0 8px}.frq-zh{color:var(--muted);margin-top:8px}.frq-zh summary{cursor:pointer;color:var(--accent);font-size:13px}.frq-zh p{border-left:3px solid var(--accent);background:var(--paper);margin:8px 0 0;padding:10px 14px}.frq-preview__part{border-top:1px solid var(--line);margin-top:30px;padding-top:18px}.frq-preview__part h3{margin:0 0 10px;font-family:"Source Serif 4 Variable",serif}.frq-preview__part h3 small{color:var(--muted);font-family:"Source Sans 3 Variable",sans-serif}.frq-preview__solution{border:1px solid var(--line);background:var(--paper);margin-top:14px;padding:12px 16px}.frq-preview__solution summary{cursor:pointer;font-weight:700}.frq-preview__solution li{padding:5px 0}.frq-preview__answer{border-top:1px solid var(--line);padding-top:10px}.frq-preview__zh-line{color:var(--muted);margin:4px 0 0;font-size:14px}.frq-preview__zh-inline{color:var(--muted);font-size:13px}.frq-preview__criterion{border:1px solid var(--line);background:var(--surface);margin-top:14px;padding:16px 18px}.frq-preview__criterion h4{margin:0 0 10px}.frq-preview__criterion code{background:var(--surface-2);padding:2px 7px}.frq-preview__criterion dt{color:var(--muted);text-transform:uppercase;letter-spacing:.08em;margin-top:12px;font-size:12px}.frq-preview__criterion dd{margin:4px 0 0}.frq-preview__criterion ul{margin:4px 0 0;padding-left:20px}.frq-preview__calculator{border:1px dashed var(--line);background:var(--paper);padding:14px}.frq-preview__teaching{border-top:3px solid var(--accent);margin-top:40px;padding-top:22px}.frq-preview__teaching h3{font-family:"Source Serif 4 Variable",serif}.frq-preview__teaching blockquote{border-left:3px solid var(--good);background:var(--surface);margin:6px 0 0;padding:10px 14px}.frq-preview__teaching li{padding:6px 0}.frq-preview .katex-display{overflow:auto hidden}.frq-preview .graph-wrap svg{width:100%;height:auto;color:var(--ink)}.frq-preview .graph-wrap text{fill:var(--muted);font-size:11px}@media (max-width:720px){.frq-preview__question{padding:20px 12px}.frq-preview__criterion{padding:12px 10px}.frq-preview__header nav{gap:6px}.frq-preview,.frq-preview__question{max-width:100%;overflow-x:hidden}}.public-brand__mark{object-fit:cover;width:42px;height:42px;box-shadow:0 2px 7px color-mix(in srgb,var(--ink) 18%,transparent);border:0;border-radius:10px;flex:none;display:block}.frq-harness{max-width:860px;margin:0 auto;padding:40px 18px}.frq-harness h1{margin:0 0 12px;font-family:"Source Serif 4 Variable",serif;font-size:clamp(26px,4vw,42px)}.frq-harness>p{color:var(--muted);max-width:680px}.frq-harness__client section{border-top:1px solid var(--line);margin-top:30px;padding-top:16px}.frq-harness__client h2{margin:0 0 12px;font-family:"Source Serif 4 Variable",serif;font-size:20px}.frq-harness__client label{margin-bottom:10px;display:block}.frq-harness__client select,.frq-harness__client input[type=text],.frq-harness__client input:not([type]){border:1px solid var(--line);background:var(--surface);min-width:0;max-width:100%;color:var(--ink);padding:6px 8px}.frq-harness__client button{border:1px solid var(--ink);background:var(--surface);color:var(--ink);cursor:pointer;margin:4px 8px 4px 0;padding:8px 14px}.frq-harness__client button:disabled{opacity:.45;cursor:default}.frq-harness__client pre{white-space:pre-wrap;word-break:break-word;border:1px solid var(--line);background:var(--paper);max-width:100%;padding:12px;font-size:12px;overflow-x:auto}@media (max-width:720px){.frq-harness{max-width:100%;padding:24px 12px;overflow-x:hidden}}
