@font-face{font-family:"Source Serif 4";font-style:normal;font-weight:200 900;font-display:swap;src:url(../media/6481e8356700f25f-s.22-vwy_zcz7be.woff2)format("woff2");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";font-style:normal;font-weight:200 900;font-display:swap;src:url(../media/3a41be36334ec777-s.3_q_pmj-3v7pv.woff2)format("woff2");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:"Source Serif 4";font-style:normal;font-weight:200 900;font-display:swap;src:url(../media/6aca2b2dd1e73eb2-s.0kupvvif_223v.woff2)format("woff2");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";font-style:normal;font-weight:200 900;font-display:swap;src:url(../media/f0ca9ca26c218c3f-s.p.11jlrhjosin9v.woff2)format("woff2");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";font-style:normal;font-weight:200 900;font-display:swap;src:url(../media/53184f85607312d4-s.3z1vcboutudqk.woff2)format("woff2");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-20C4,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:"Source Serif 4";font-style:normal;font-weight:200 900;font-display:swap;src:url(../media/7c42b85337e0c4bb-s.p.012bmydply3go.woff2)format("woff2");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 Fallback";src:local(Times New Roman);ascent-override:87.87%;descent-override:28.41%;line-gap-override:0.0%;size-adjust:117.91%}.feXcHq_className{font-family:"Source Serif 4","Source Serif 4 Fallback";font-style:normal}.feXcHq_variable{--font-source-serif:"Source Serif 4", "Source Serif 4 Fallback"}
@font-face{font-family:IBM Plex Sans;font-style:normal;font-weight:400;font-stretch:100%;font-display:swap;src:url(../media/44ed10da57ebfb0e-s.2y65deuc30pmy.woff2)format("woff2");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:IBM Plex Sans;font-style:normal;font-weight:400;font-stretch:100%;font-display:swap;src:url(../media/73263b2957b73100-s.2qt3tdwt-y9x_.woff2)format("woff2");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:IBM Plex Sans;font-style:normal;font-weight:400;font-stretch:100%;font-display:swap;src:url(../media/ab664c0e419cc841-s.3cvcemwuzoywn.woff2)format("woff2");unicode-range:U+370-377,U+37A-37F,U+384-38A,U+38C,U+38E-3A1,U+3A3-3FF}@font-face{font-family:IBM Plex Sans;font-style:normal;font-weight:400;font-stretch:100%;font-display:swap;src:url(../media/6fca7e74603dd412-s.p.02z5rrbg5nt92.woff2)format("woff2");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:IBM Plex Sans;font-style:normal;font-weight:400;font-stretch:100%;font-display:swap;src:url(../media/c1b11b726b36a5e5-s.2rixgazldzomk.woff2)format("woff2");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-20C4,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:IBM Plex Sans;font-style:normal;font-weight:400;font-stretch:100%;font-display:swap;src:url(../media/48eea41d8317494f-s.p.0wiir8udbzjvx.woff2)format("woff2");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:IBM Plex Sans;font-style:normal;font-weight:500;font-stretch:100%;font-display:swap;src:url(../media/44ed10da57ebfb0e-s.2y65deuc30pmy.woff2)format("woff2");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:IBM Plex Sans;font-style:normal;font-weight:500;font-stretch:100%;font-display:swap;src:url(../media/73263b2957b73100-s.2qt3tdwt-y9x_.woff2)format("woff2");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:IBM Plex Sans;font-style:normal;font-weight:500;font-stretch:100%;font-display:swap;src:url(../media/ab664c0e419cc841-s.3cvcemwuzoywn.woff2)format("woff2");unicode-range:U+370-377,U+37A-37F,U+384-38A,U+38C,U+38E-3A1,U+3A3-3FF}@font-face{font-family:IBM Plex Sans;font-style:normal;font-weight:500;font-stretch:100%;font-display:swap;src:url(../media/6fca7e74603dd412-s.p.02z5rrbg5nt92.woff2)format("woff2");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:IBM Plex Sans;font-style:normal;font-weight:500;font-stretch:100%;font-display:swap;src:url(../media/c1b11b726b36a5e5-s.2rixgazldzomk.woff2)format("woff2");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-20C4,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:IBM Plex Sans;font-style:normal;font-weight:500;font-stretch:100%;font-display:swap;src:url(../media/48eea41d8317494f-s.p.0wiir8udbzjvx.woff2)format("woff2");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:IBM Plex Sans;font-style:normal;font-weight:600;font-stretch:100%;font-display:swap;src:url(../media/44ed10da57ebfb0e-s.2y65deuc30pmy.woff2)format("woff2");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:IBM Plex Sans;font-style:normal;font-weight:600;font-stretch:100%;font-display:swap;src:url(../media/73263b2957b73100-s.2qt3tdwt-y9x_.woff2)format("woff2");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:IBM Plex Sans;font-style:normal;font-weight:600;font-stretch:100%;font-display:swap;src:url(../media/ab664c0e419cc841-s.3cvcemwuzoywn.woff2)format("woff2");unicode-range:U+370-377,U+37A-37F,U+384-38A,U+38C,U+38E-3A1,U+3A3-3FF}@font-face{font-family:IBM Plex Sans;font-style:normal;font-weight:600;font-stretch:100%;font-display:swap;src:url(../media/6fca7e74603dd412-s.p.02z5rrbg5nt92.woff2)format("woff2");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:IBM Plex Sans;font-style:normal;font-weight:600;font-stretch:100%;font-display:swap;src:url(../media/c1b11b726b36a5e5-s.2rixgazldzomk.woff2)format("woff2");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-20C4,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:IBM Plex Sans;font-style:normal;font-weight:600;font-stretch:100%;font-display:swap;src:url(../media/48eea41d8317494f-s.p.0wiir8udbzjvx.woff2)format("woff2");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:IBM Plex Sans Fallback;src:local(Arial);ascent-override:101.32%;descent-override:27.18%;line-gap-override:0.0%;size-adjust:101.17%}._MZDmq_className{font-family:IBM Plex Sans,IBM Plex Sans Fallback;font-style:normal}._MZDmq_variable{--font-ibm-plex:"IBM Plex Sans", "IBM Plex Sans Fallback"}
@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,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;--color-canvas:#f2efe7;--color-surface:#f8f6f0;--color-surface-raised:#fcfaf5;--color-ink:#171715;--color-ink-muted:#67635d;--color-line:#d8d4ca;--color-line-strong:#aaa59b;--color-brand:#542a50;--color-brand-hover:#442141;--color-brand-soft:#ece3ea;--color-insight:#c8f04b;--color-insight-soft:#eef8cb;--color-insight-ink:#202410;--color-danger:#8d3340;--color-danger-soft:#f3e4e5;--color-success:#47624b;--color-success-soft:#e5ede5;--color-warning:#756126;--color-warning-soft:#f0ead8;--color-scrim:#17171599;--color-shadow:#1717151a;--font-editorial:var(--font-source-serif), Georgia, "Times New Roman", serif;--font-interface:var(--font-ibm-plex), Arial, sans-serif;--font-math:KaTeX_Main, "STIX Two Math", "Cambria Math", serif;--text-xs:.75rem;--text-sm:.875rem;--text-base:1rem;--text-lg:1.25rem;--text-xl:1.5rem;--text-2xl:clamp(2rem, 4vw, 3.5rem);--text-display:clamp(3rem, 7vw, 6rem);--leading-tight:1.08;--leading-heading:1.18;--leading-body:1.65;--tracking-label:.02em;--space-1:.25rem;--space-2:.5rem;--space-3:.75rem;--space-4:1rem;--space-6:1.5rem;--space-8:2rem;--space-12:3rem;--space-16:4rem;--space-24:6rem;--radius-xs:.125rem;--radius-sm:.25rem;--radius-md:.375rem;--radius-round:999rem;--border-thin:1px;--border-emphasis:2px;--content-max:90rem;--reading-max:70ch;--header-height:4.5rem;--rail-width:15rem;--motion-micro:.15s;--motion-state:.24s;--motion-explain:.56s;--ease-standard:cubic-bezier(.2, 0, 0, 1);--shadow-floating:0 1rem 3rem var(--color-shadow)}
*,:before,:after{box-sizing:border-box}html{background:var(--color-canvas);color:var(--color-ink);font-family:var(--font-interface);scroll-behavior:smooth}body{background:radial-gradient(circle at 82% 4%, var(--color-surface) 0, transparent 30rem), var(--color-canvas);min-height:100vh;font-size:var(--text-base);line-height:var(--leading-body);text-rendering:optimizelegibility;margin:0}button,input,textarea,select{font:inherit}button,a,summary,input{-webkit-tap-highlight-color:transparent}a{color:inherit}img,svg,video{max-width:100%;display:block}::selection{background:var(--color-insight);color:var(--color-insight-ink)}:focus-visible{outline:var(--border-emphasis) solid var(--color-brand);outline-offset:.2rem;box-shadow:0 0 0 .25rem var(--color-insight-soft)}.skip-link{z-index:100;inset:var(--space-3) auto auto var(--space-3);padding:var(--space-2) var(--space-4);border:var(--border-thin) solid var(--color-ink);border-radius:var(--radius-sm);background:var(--color-insight);color:var(--color-insight-ink);transition:translate var(--motion-micro) var(--ease-standard);font-weight:600;position:fixed;translate:0 -200%}.skip-link:focus{translate:0}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}
.visually-hidden{clip:rect(0, 0, 0, 0)!important;white-space:nowrap!important;border:0!important;width:1px!important;height:1px!important;margin:-1px!important;padding:0!important;position:absolute!important;overflow:hidden!important}.container{width:min(100% - clamp(2rem, 6vw, 7rem), var(--content-max));margin-inline:auto}.site-header{z-index:50;min-height:var(--header-height);border-bottom:var(--border-thin) solid var(--color-line);background:color-mix(in srgb, var(--color-canvas) 94%, transparent);-webkit-backdrop-filter:blur(1rem);backdrop-filter:blur(1rem);grid-template-columns:max-content 1fr auto;align-items:center;padding-inline:clamp(1rem,4vw,4rem);display:grid;position:sticky;top:0}.brand{font-family:var(--font-editorial);letter-spacing:-.035em;font-size:clamp(1.65rem,3vw,2.25rem);font-weight:600;line-height:1;text-decoration:none}.desktop-nav{justify-content:center;gap:clamp(var(--space-3), 2vw, var(--space-6));padding-inline:var(--space-6);display:flex}.desktop-nav a{padding-block:var(--space-2);color:var(--color-ink-muted);font-size:var(--text-sm);white-space:nowrap;font-weight:500;text-decoration:none;position:relative}.desktop-nav a:after{height:var(--border-emphasis);background:var(--color-brand);content:"";transition:inset var(--motion-micro) var(--ease-standard);position:absolute;inset:auto 50% 0}.desktop-nav a:hover{color:var(--color-ink)}.desktop-nav a:hover:after{inset-inline:0}.header-actions{align-items:center;gap:var(--space-4);display:flex}.header-actions .search{width:clamp(12rem,19vw,19rem)}.avatar{border-radius:var(--radius-round);background:var(--color-brand);width:2.4rem;height:2.4rem;color:var(--color-surface);font-family:var(--font-editorial);font-size:var(--text-lg);place-items:center;text-decoration:none;display:grid}.mobile-menu{display:none}.search{align-items:center;gap:var(--space-2);min-height:2.75rem;padding-inline:var(--space-3);border:var(--border-thin) solid var(--color-line-strong);border-radius:var(--radius-sm);background:var(--color-surface);color:var(--color-ink-muted);display:flex}.search:focus-within{border-color:var(--color-brand);box-shadow:0 0 0 .2rem var(--color-insight-soft)}.search input{min-width:0;color:var(--color-ink);background:0 0;border:0;outline:0;flex:1}.search input::placeholder{color:var(--color-ink-muted);opacity:.85}.search input::-webkit-search-cancel-button{display:none}.search kbd{color:var(--color-ink-muted);font-size:var(--text-xs)}.button{justify-content:center;align-items:center;gap:var(--space-2);border:var(--border-thin) solid transparent;border-radius:var(--radius-sm);cursor:pointer;font-family:var(--font-interface);transition:background var(--motion-micro) var(--ease-standard), color var(--motion-micro) var(--ease-standard), border-color var(--motion-micro) var(--ease-standard), translate var(--motion-micro) var(--ease-standard);font-weight:600;line-height:1;text-decoration:none;display:inline-flex}.button:hover:not(:disabled){translate:0 -1px}.button:active:not(:disabled){translate:0}.button:disabled{cursor:not-allowed;opacity:.5}.button--sm{min-height:2.25rem;padding:var(--space-2) var(--space-3);font-size:var(--text-sm)}.button--md{min-height:2.75rem;padding:var(--space-3) var(--space-4)}.button--lg{min-height:3.25rem;padding:var(--space-4) var(--space-6);font-size:var(--text-lg)}.button--primary{background:var(--color-brand);color:var(--color-surface)}.button--primary:hover:not(:disabled){background:var(--color-brand-hover)}.button--secondary{border-color:var(--color-line-strong);color:var(--color-ink);background:0 0}.button--secondary:hover:not(:disabled){border-color:var(--color-brand);color:var(--color-brand)}.button--ghost{color:var(--color-brand);background:0 0}.button--ghost:hover:not(:disabled){background:var(--color-brand-soft)}.button--danger{background:var(--color-danger);color:var(--color-surface)}.button svg{width:1.15em;height:1.15em}.text-link{align-items:center;gap:var(--space-2);color:var(--color-brand);text-decoration-thickness:var(--border-thin);text-underline-offset:.25em;font-weight:600;display:inline-flex}.text-link svg{transition:translate var(--motion-micro) var(--ease-standard)}.text-link:hover svg{translate:var(--space-1)}.field{gap:var(--space-2);display:grid}.field__label{font-weight:600;line-height:var(--leading-heading)}.field__hint{color:var(--color-ink-muted);font-size:var(--text-sm)}.field__control{width:100%;min-height:2.9rem;padding-inline:var(--space-3);border:var(--border-thin) solid var(--color-line-strong);border-radius:var(--radius-sm);background:var(--color-surface);color:var(--color-ink);outline:0}.field__control:focus{border-color:var(--color-brand);box-shadow:0 0 0 .2rem var(--color-insight-soft)}.field__error{color:var(--color-danger);font-size:var(--text-sm);font-weight:500}.field--error .field__control{border-color:var(--color-danger)}.breadcrumb{padding-block:var(--space-6);color:var(--color-ink-muted);font-size:var(--text-sm)}.breadcrumb ol{align-items:center;gap:var(--space-2);flex-wrap:wrap;margin:0;padding:0;list-style:none;display:flex}.breadcrumb li{align-items:center;gap:var(--space-2);display:flex}.breadcrumb li:not(:last-child):after{content:"/";color:var(--color-line-strong)}.breadcrumb a{text-underline-offset:.2em;text-decoration-color:#0000}.breadcrumb a:hover{color:var(--color-brand);text-decoration-color:currentColor}.tabs{border-top:var(--border-thin) solid var(--color-line)}.tabs__list{gap:var(--space-6);display:flex;overflow-x:auto}.tabs__list button{min-height:3.25rem;color:var(--color-ink-muted);cursor:pointer;white-space:nowrap;background:0 0;border:0;padding:0;position:relative}.tabs__list button[aria-selected=true]{color:var(--color-brand);font-weight:600}.tabs__list button[aria-selected=true]:after{height:var(--border-emphasis);background:var(--color-brand);content:"";position:absolute;inset:auto 0 0}.tabs__panel{min-height:7rem;padding-block:var(--space-6);font-family:var(--font-editorial);font-size:var(--text-lg)}.divider{height:var(--border-thin);margin-block:var(--space-8);background:var(--color-line);border:0}.divider--labeled{align-items:center;gap:var(--space-4);height:auto;color:var(--color-ink-muted);font-size:var(--text-xs);letter-spacing:var(--tracking-label);text-transform:uppercase;background:0 0;display:flex}.divider--labeled:before,.divider--labeled:after{height:var(--border-thin);background:var(--color-line);content:"";flex:1}.callout{gap:var(--space-3);padding:var(--space-4);border-left:var(--border-emphasis) solid var(--color-brand);background:var(--color-brand-soft);grid-template-columns:auto 1fr;display:grid}.callout strong{margin-bottom:var(--space-1);font-family:var(--font-editorial);font-size:var(--text-lg);display:block}.callout>svg{margin-top:var(--space-1);color:var(--color-brand)}.callout--insight{border-color:var(--color-insight-ink);background:var(--color-insight-soft)}.callout--insight>svg{color:var(--color-insight-ink)}.callout--success{border-color:var(--color-success);background:var(--color-success-soft)}.callout--success>svg{color:var(--color-success)}.callout--warning{border-color:var(--color-warning);background:var(--color-warning-soft)}.callout--warning>svg{color:var(--color-warning)}.callout--danger{border-color:var(--color-danger);background:var(--color-danger-soft)}.callout--danger>svg{color:var(--color-danger)}.dialog{width:min(32rem,100% - 2rem);padding:var(--space-6);border:var(--border-thin) solid var(--color-line-strong);border-radius:var(--radius-md);background:var(--color-surface-raised);color:var(--color-ink);box-shadow:var(--shadow-floating)}.dialog::backdrop{background:var(--color-scrim);-webkit-backdrop-filter:blur(.15rem);backdrop-filter:blur(.15rem)}.dialog__header{justify-content:space-between;align-items:start;gap:var(--space-4);display:flex}.dialog h2{font-family:var(--font-editorial);font-size:var(--text-xl);margin:0}.dialog__actions{justify-content:flex-end;gap:var(--space-2);margin-top:var(--space-6);display:flex}.icon-button{border-radius:var(--radius-sm);width:2.5rem;height:2.5rem;color:var(--color-ink);cursor:pointer;background:0 0;border:0;place-items:center;padding:0;display:grid}.icon-button:hover{background:var(--color-brand-soft)}.skeleton{gap:var(--space-3);min-height:16rem;padding:var(--space-6);border:var(--border-thin) solid var(--color-line);align-content:center;display:grid}.skeleton span{border-radius:var(--radius-xs);background:linear-gradient(90deg, var(--color-line), var(--color-surface), var(--color-line));background-size:200% 100%;height:.8rem;animation:1.5s linear infinite loading;display:block}.skeleton .skeleton__title{width:60%;height:1.5rem;margin-bottom:var(--space-2)}.skeleton .skeleton__line:nth-child(3){width:88%}.skeleton .skeleton__line:last-child{width:72%}@keyframes loading{to{background-position:-200% 0}}.math{font-family:var(--font-math)}.math--inline{white-space:nowrap}.math--display{margin-block:var(--space-6);padding:var(--space-4);background:var(--color-brand-soft);text-align:center;overflow-x:auto}.math--display .katex{font-size:clamp(1.25rem,3vw,2rem)}.figure-frame,.media-frame{border:var(--border-thin) solid var(--color-line);background:color-mix(in srgb, var(--color-surface) 65%, transparent);margin:0}.frame__heading{padding:var(--space-3) var(--space-4);border-bottom:var(--border-thin) solid var(--color-line);justify-content:space-between;align-items:center;display:flex}.frame__heading>span{color:var(--color-ink-muted);font-size:var(--text-xs)}.figure-frame__canvas{min-height:18rem;padding:var(--space-6);place-items:center;display:grid}.figure-frame figcaption,.media-frame figcaption{justify-content:space-between;gap:var(--space-2);padding:var(--space-3) var(--space-4);border-top:var(--border-thin) solid var(--color-line);color:var(--color-ink-muted);font-size:var(--text-sm);flex-wrap:wrap;display:flex}.media-frame__canvas{place-content:center;justify-items:center;gap:var(--space-3);background:var(--color-ink);min-height:22rem;color:var(--color-surface);display:grid}.state-panel{min-height:16rem;padding:var(--space-6);border:var(--border-thin) solid var(--color-line);align-content:center;justify-items:start;display:grid}.state-panel h2{margin:var(--space-3) 0 var(--space-1);font-family:var(--font-editorial);font-size:var(--text-xl)}.state-panel p{margin:0 0 var(--space-4);color:var(--color-ink-muted)}.state-panel>svg{color:var(--color-brand)}.state-panel--error>svg{color:var(--color-danger)}.foundation-home{align-items:center;gap:var(--space-12);min-height:calc(100vh - var(--header-height));padding-block:var(--space-16);grid-template-columns:1.05fr .95fr;display:grid}.foundation-home__copy{padding-left:clamp(0rem, 3vw, var(--space-12))}.eyebrow{margin-bottom:var(--space-4);color:var(--color-brand);font-size:var(--text-xs);letter-spacing:.12em;text-transform:uppercase;font-weight:600;display:block}.foundation-home h1{max-width:13ch;font-family:var(--font-editorial);font-size:var(--text-display);letter-spacing:-.045em;font-weight:500;line-height:var(--leading-tight);margin:0}.foundation-home__copy>p{max-width:57ch;margin-block:var(--space-6);font-family:var(--font-editorial);font-size:var(--text-lg)}.foundation-home__geometry{padding:var(--space-8);border-left:var(--border-thin) solid var(--color-line);position:relative}.foundation-home__geometry svg{color:var(--color-brand)}.foundation-home__geometry circle{fill:var(--color-brand);stroke:var(--color-canvas);stroke-width:3px}.foundation-home__geometry .geo-focus{fill:var(--color-insight);stroke:var(--color-brand)}.geo-line{fill:none;stroke:currentColor;stroke-width:2px}.geo-guide{fill:none;stroke:var(--color-line-strong);stroke-width:1.5px;stroke-dasharray:6 6}.geo-arc{fill:none;stroke:var(--color-line-strong);stroke-width:1.5px}.foundation-home__geometry .math--display{width:72%;margin:-2rem 0 0 auto}.standalone-state{min-height:calc(100vh - var(--header-height));place-items:center;display:grid}.standalone-state .state-panel{width:min(100%,36rem)}.ui-kit{padding-bottom:var(--space-24)}.ui-kit__intro{gap:var(--space-6);padding:var(--space-12) 0 var(--space-16);border-bottom:var(--border-thin) solid var(--color-ink);grid-template-columns:minmax(0,9fr) minmax(12rem,3fr);align-items:end;display:grid}.ui-kit__intro .eyebrow{grid-column:1/-1;margin:0}.ui-kit__intro h1{max-width:16ch;font-family:var(--font-editorial);font-size:var(--text-2xl);letter-spacing:-.035em;font-weight:500;line-height:var(--leading-tight);margin:0}.ui-kit__intro>p{max-width:34ch;font-family:var(--font-editorial);font-size:var(--text-lg);margin:0}.ui-kit__meta{gap:var(--space-6);color:var(--color-ink-muted);font-size:var(--text-xs);text-transform:uppercase;letter-spacing:var(--tracking-label);grid-column:1/-1;display:flex}.ui-section{padding-block:var(--space-16);border-bottom:var(--border-thin) solid var(--color-line)}.section-heading{gap:var(--space-4);margin-bottom:var(--space-8);grid-template-columns:3rem 1fr;display:grid}.section-heading>span{color:var(--color-brand);font-size:var(--text-sm);padding-top:.35rem;font-weight:600}.section-heading h2{font-family:var(--font-editorial);font-size:var(--text-2xl);font-weight:500;line-height:var(--leading-heading);margin:0}.section-heading p{margin:var(--space-2) 0 0;color:var(--color-ink-muted)}.token-grid{border:var(--border-thin) solid var(--color-line);grid-template-columns:repeat(9,1fr);display:grid}.color-token{min-width:0;padding:var(--space-3);border-right:var(--border-thin) solid var(--color-line)}.color-token:last-child{border:0}.color-token__swatch{aspect-ratio:1;margin-bottom:var(--space-3);border:var(--border-thin) solid var(--color-line);display:block}.color-token__swatch--canvas{background:var(--color-canvas)}.color-token__swatch--surface{background:var(--color-surface)}.color-token__swatch--ink{background:var(--color-ink)}.color-token__swatch--line{background:var(--color-line)}.color-token__swatch--brand{background:var(--color-brand)}.color-token__swatch--insight{background:var(--color-insight)}.color-token__swatch--success{background:var(--color-success)}.color-token__swatch--warning{background:var(--color-warning)}.color-token__swatch--danger{background:var(--color-danger)}.color-token strong{font-size:var(--text-xs);text-overflow:ellipsis;white-space:nowrap;display:block;overflow:hidden}.color-token code{color:var(--color-ink-muted);text-overflow:ellipsis;white-space:nowrap;font-size:.65rem;display:block;overflow:hidden}.type-specimen{border-top:var(--border-thin) solid var(--color-line)}.type-specimen>div{padding-block:var(--space-6);border-bottom:var(--border-thin) solid var(--color-line);grid-template-columns:8rem 1fr;align-items:baseline;display:grid}.type-specimen span{color:var(--color-ink-muted);font-size:var(--text-xs);text-transform:uppercase}.type-specimen p{margin:0}.type-display{font-family:var(--font-editorial);font-size:var(--text-2xl);line-height:var(--leading-tight)}.type-heading{font-family:var(--font-editorial);font-size:var(--text-xl);font-weight:600}.type-body{max-width:var(--reading-max);font-family:var(--font-editorial);font-size:var(--text-lg)}.type-interface{font-size:var(--text-sm);letter-spacing:var(--tracking-label);font-weight:600}.math-specimen{gap:var(--space-8);margin-top:var(--space-8);grid-template-columns:1fr 1fr;align-items:center;display:grid}.math-specimen p{font-family:var(--font-editorial);font-size:var(--text-lg)}.component-grid{gap:var(--space-6);display:grid}.component-grid--two{grid-template-columns:repeat(2,minmax(0,1fr))}.component-grid--three{grid-template-columns:repeat(3,minmax(0,1fr))}.specimen{min-width:0;padding:var(--space-6);border:var(--border-thin) solid var(--color-line)}.specimen h3{margin:0 0 var(--space-6);font-family:var(--font-editorial);font-size:var(--text-xl)}.row-wrap{align-items:center;gap:var(--space-3);flex-wrap:wrap;display:flex}.form-stack{gap:var(--space-6);display:grid}.callout-stack{gap:var(--space-3);display:grid}.triangle-demo{color:var(--color-brand);overflow:visible}.triangle-demo path:first-child{fill:none;stroke:currentColor;stroke-width:2px}.triangle-demo circle{fill:var(--color-brand)}.triangle-demo .geo-focus{fill:var(--color-insight);stroke:var(--color-brand);stroke-width:2px}.triangle-demo text{fill:var(--color-ink);font-family:var(--font-editorial);text-anchor:middle;font-size:1.25rem;font-style:italic}.state-grid{margin-top:var(--space-8)}.shell-preview{padding-block:var(--space-16);background:var(--color-surface)}.dashboard-shell{grid-template-columns:var(--rail-width) 1fr;border-block:var(--border-thin) solid var(--color-line);background:var(--color-canvas);min-height:34rem;display:grid}.left-rail{padding:var(--space-8) var(--space-6);border-right:var(--border-thin) solid var(--color-line);flex-direction:column;display:flex}.left-rail>p{margin:0 0 var(--space-4);color:var(--color-ink-muted);font-size:var(--text-xs);letter-spacing:var(--tracking-label);text-transform:uppercase;font-weight:600}.left-rail nav{gap:var(--space-1);display:grid}.left-rail nav a{align-items:center;gap:var(--space-3);padding:var(--space-3);border-left:var(--border-emphasis) solid transparent;color:var(--color-ink-muted);font-size:var(--text-sm);text-decoration:none;display:flex}.left-rail nav a:hover{color:var(--color-ink)}.left-rail nav a[aria-current=page]{border-color:var(--color-brand);background:var(--color-brand-soft);color:var(--color-brand);font-weight:600}.left-rail nav svg{width:1.2rem;height:1.2rem}.left-rail blockquote{padding-top:var(--space-6);border-top:var(--border-thin) solid var(--color-line);color:var(--color-ink-muted);font-family:var(--font-editorial);margin:auto 0 0}.dashboard-content{min-width:0}.shell-preview__content{min-height:100%;padding:clamp(var(--space-8), 7vw, var(--space-24));align-content:center;display:grid}.shell-preview__content h2{font-family:var(--font-editorial);font-size:var(--text-2xl);font-weight:500;line-height:var(--leading-heading);margin:0}.progress-line{max-width:44rem;margin-top:var(--space-12);justify-content:space-between;display:flex;position:relative}.progress-line:before{z-index:0;height:var(--border-thin);background:var(--color-line-strong);content:"";position:absolute;inset:50% 0 auto}.progress-line span{z-index:1;border:var(--border-thin) solid var(--color-line-strong);border-radius:var(--radius-round);background:var(--color-canvas);width:2.3rem;height:2.3rem;font-size:var(--text-sm);place-items:center;display:grid;position:relative}.progress-line .is-complete{border-color:var(--color-brand);background:var(--color-brand);color:var(--color-surface)}.progress-line .is-complete:nth-child(3){border-color:var(--color-brand);background:var(--color-insight);color:var(--color-insight-ink);box-shadow:0 0 0 var(--space-2) var(--color-insight-soft)}@media (max-width:74rem){.desktop-nav{display:none}.site-header{gap:var(--space-3);grid-template-columns:1fr auto auto}.header-actions .search{display:none}.mobile-menu{display:block}.mobile-menu summary{align-items:center;gap:var(--space-2);padding:var(--space-2);border-radius:var(--radius-sm);cursor:pointer;font-size:var(--text-sm);font-weight:600;list-style:none;display:flex}.mobile-menu summary::-webkit-details-marker{display:none}.mobile-menu__panel{inset:var(--header-height) 0 auto;padding:var(--space-4) clamp(1rem, 4vw, 4rem) var(--space-6);border-bottom:var(--border-thin) solid var(--color-line-strong);background:var(--color-surface-raised);box-shadow:var(--shadow-floating);position:absolute;overflow-y:auto}.mobile-menu__panel nav{gap:var(--space-2);margin-top:var(--space-4);grid-template-columns:repeat(4,1fr);display:grid}.mobile-menu__panel nav a{align-items:center;gap:var(--space-2);min-height:3rem;padding:var(--space-2);border-bottom:var(--border-thin) solid var(--color-line);text-decoration:none;display:flex}.mobile-menu__panel nav svg{width:1.15rem}.token-grid{grid-template-columns:repeat(5,1fr)}.color-token{border-bottom:var(--border-thin) solid var(--color-line)}}@media (max-width:50rem){.container{width:min(100% - 2rem, var(--content-max))}.site-header{min-height:4rem;padding-inline:1rem}.avatar{width:2.25rem;height:2.25rem}.mobile-menu summary span{display:none}.mobile-menu__panel{min-height:calc(100dvh - 4rem);inset-block-start:4rem}.mobile-menu__panel nav{grid-template-columns:repeat(2,1fr)}.foundation-home{gap:var(--space-8);min-height:auto;padding-block:var(--space-12);grid-template-columns:1fr}.foundation-home__geometry{border-top:var(--border-thin) solid var(--color-line);padding:var(--space-6) 0;border-left:0}.ui-kit__intro{padding-block:var(--space-8) var(--space-12);grid-template-columns:1fr}.ui-kit__intro .eyebrow,.ui-kit__meta{grid-column:auto}.ui-section{padding-block:var(--space-12)}.section-heading{grid-template-columns:2rem 1fr}.token-grid{grid-template-columns:repeat(3,1fr)}.type-specimen>div{gap:var(--space-2);grid-template-columns:1fr}.math-specimen,.component-grid--two,.component-grid--three{grid-template-columns:1fr}.figure-frame__canvas{min-height:14rem;padding:var(--space-3)}.media-frame__canvas{min-height:16rem}.dashboard-shell{grid-template-columns:1fr}.left-rail{display:none}.shell-preview__content{min-height:27rem;padding:var(--space-8) var(--space-4)}}@media (max-width:28rem){.token-grid{grid-template-columns:repeat(2,1fr)}.ui-kit__meta{gap:var(--space-3);flex-wrap:wrap}.dialog__actions{flex-direction:column-reverse}.dialog__actions .button{width:100%}}.home-page{padding-bottom:var(--space-24)}.home-hero{align-items:center;gap:clamp(var(--space-8), 7vw, var(--space-24));min-height:min(48rem, calc(100vh - var(--header-height)));padding-block:var(--space-16);border-bottom:var(--border-thin) solid var(--color-ink);grid-template-columns:minmax(0,7fr) minmax(20rem,5fr);display:grid}.home-hero__copy h1{max-width:12ch;font-family:var(--font-editorial);font-size:var(--text-display);letter-spacing:-.05em;font-weight:500;line-height:var(--leading-tight);margin:0}.home-hero__copy>p{max-width:56ch;margin-block:var(--space-6);font-family:var(--font-editorial);font-size:var(--text-lg)}.hero-actions{gap:var(--space-3);flex-wrap:wrap;display:flex}.home-hero__figure{padding-left:clamp(var(--space-6), 5vw, var(--space-12));border-left:var(--border-thin) solid var(--color-line-strong)}.factor-figure{align-content:center;gap:var(--space-8);min-height:27rem;display:grid;position:relative}.factor-figure__number{color:var(--color-line-strong);font-family:var(--font-editorial);font-size:clamp(5rem,13vw,11rem);line-height:.8;position:absolute;inset:0 0 auto auto}.factor-figure__grid{z-index:1;gap:clamp(var(--space-3), 2.4vw, var(--space-6));grid-template-columns:repeat(4,1fr);width:min(100%,19rem);display:grid;position:relative}.factor-figure__grid i{aspect-ratio:1;border:var(--border-thin) solid var(--color-brand);border-radius:var(--radius-round);background:var(--color-canvas)}.factor-figure__grid i:nth-child(7){background:var(--color-insight);box-shadow:0 0 0 var(--space-2) var(--color-insight-soft)}.factor-figure p{max-width:31ch;color:var(--color-ink-muted);font-family:var(--font-editorial);font-size:var(--text-lg);margin:0}.continue-strip{gap:var(--space-12);padding-block:var(--space-12);border-bottom:var(--border-thin) solid var(--color-line);grid-template-columns:minmax(0,8fr) minmax(16rem,4fr);display:grid}.continue-strip h2,.home-section h2{margin:var(--space-2) 0;font-family:var(--font-editorial);font-size:var(--text-2xl);font-weight:500;line-height:var(--leading-heading)}.continue-strip p{max-width:58ch;color:var(--color-ink-muted);margin:0}.section-index,.content-kicker{color:var(--color-brand);font-size:var(--text-xs);letter-spacing:var(--tracking-label);text-transform:uppercase;font-weight:600}.continue-strip__progress{align-content:center;gap:var(--space-3);display:grid}.continue-strip__progress>div{font-size:var(--text-sm);justify-content:space-between;display:flex}.continue-strip__progress progress{background:var(--color-line);border:0;width:100%;height:.35rem}.continue-strip__progress progress::-webkit-progress-bar{background:var(--color-line)}.continue-strip__progress progress::-webkit-progress-value{background:var(--color-brand)}.continue-strip__progress progress::-moz-progress-bar{background:var(--color-brand)}.home-section{padding-block:var(--space-16);border-bottom:var(--border-thin) solid var(--color-line)}.home-section>header{margin-bottom:var(--space-8);grid-template-columns:1fr auto;align-items:end;display:grid}.home-section>header .section-index{grid-column:1/-1}.route-preview{gap:var(--space-4);padding:var(--space-8) 0 0;grid-template-columns:repeat(4,1fr);margin:0;list-style:none;display:grid;position:relative}.route-preview:before{height:var(--border-thin);background:var(--color-line-strong);content:"";position:absolute;inset:3rem 6% auto}.route-preview li{gap:var(--space-3);grid-template-columns:auto 1fr;align-items:center;display:grid;position:relative}.route-preview li>span{border:var(--border-thin) solid var(--color-line-strong);border-radius:var(--radius-round);background:var(--color-canvas);width:3rem;height:3rem;font-size:var(--text-sm);place-items:center;display:grid}.route-preview li.is-complete>span{border-color:var(--color-brand);background:var(--color-brand);color:var(--color-surface)}.route-preview li.is-current>span{border-color:var(--color-brand);background:var(--color-insight);box-shadow:0 0 0 var(--space-2) var(--color-insight-soft)}.route-preview strong,.route-preview small{display:block}.route-preview small{color:var(--color-ink-muted)}.editorial-grid{border-block:var(--border-thin) solid var(--color-line);grid-template-columns:2fr repeat(3,1fr);display:grid}.editorial-grid article{min-width:0;padding:var(--space-6);border-right:var(--border-thin) solid var(--color-line)}.editorial-grid article:last-child{border:0}.editorial-grid h3{margin:var(--space-4) 0;font-family:var(--font-editorial);font-size:var(--text-xl);line-height:var(--leading-heading)}.editorial-grid h3 a{text-decoration:none}.editorial-grid h3 a:hover{color:var(--color-brand);text-underline-offset:.2em;text-decoration:underline}.editorial-grid p{color:var(--color-ink-muted);margin:0}.feature-story{background:var(--color-brand-soft)}.feature-story h3{font-size:var(--text-2xl)}.discovery-page{padding-bottom:var(--space-24)}.discovery-header{gap:var(--space-12);padding:var(--space-8) 0 var(--space-12);border-bottom:var(--border-thin) solid var(--color-ink);grid-template-columns:minmax(0,7fr) minmax(18rem,5fr);align-items:end;display:grid}.discovery-header h1,.lesson-hero h1,.mode-page>header h1,.not-found-page h1{max-width:15ch;font-family:var(--font-editorial);font-size:var(--text-2xl);letter-spacing:-.035em;font-weight:500;line-height:var(--leading-heading);margin:0}.discovery-header__copy p{max-width:48ch;font-family:var(--font-editorial);font-size:var(--text-lg);margin:0}.result-count{margin-top:var(--space-4);color:var(--color-ink-muted);font-size:var(--text-sm);display:block}.filter-bar{align-items:end;gap:var(--space-3);padding-block:var(--space-6);border-bottom:var(--border-thin) solid var(--color-line);display:flex}.filter-bar__fields{gap:var(--space-3);flex-wrap:wrap;flex:1;display:flex}.filter-bar label{gap:var(--space-1);min-width:10rem;display:grid}.filter-bar label>span{color:var(--color-ink-muted);font-size:var(--text-xs);font-weight:600}.filter-bar select{min-height:2.5rem;padding-inline:var(--space-3);border:var(--border-thin) solid var(--color-line-strong);border-radius:var(--radius-sm);background:var(--color-surface);color:var(--color-ink)}.filter-reset{padding:var(--space-2);color:var(--color-brand);font-size:var(--text-sm)}.status-pill{align-items:center;gap:var(--space-2);color:var(--color-ink-muted);font-size:var(--text-xs);white-space:nowrap;font-weight:600;display:inline-flex}.status-pill:before{border:var(--border-thin) solid currentColor;border-radius:var(--radius-round);content:"";width:.55rem;height:.55rem}.status-pill--active{color:var(--color-ink)}.status-pill--active:before{border-color:var(--color-brand);background:var(--color-insight);box-shadow:0 0 0 .2rem var(--color-insight-soft)}.status-pill--complete{color:var(--color-brand)}.status-pill--complete:before{background:var(--color-brand)}.empty-results{min-height:20rem;padding:var(--space-8);place-content:center;justify-items:start;display:grid}.empty-results h2{margin:var(--space-3) 0 0;font-family:var(--font-editorial);font-size:var(--text-xl)}.empty-results p{color:var(--color-ink-muted)}.catalog-list{border-bottom:var(--border-thin) solid var(--color-line)}.catalog-row{gap:var(--space-6);padding-block:var(--space-8);border-bottom:var(--border-thin) solid var(--color-line);grid-template-columns:4rem minmax(0,1fr) 9rem;align-items:start;display:grid}.catalog-row:last-child{border:0}.catalog-row__index{color:var(--color-line-strong);font-family:var(--font-editorial);font-size:var(--text-2xl);line-height:1}.catalog-row h2,.exercise-card h2,.key-list h2,.library-grid h2,.exam-list h2,.search-results h2{margin:var(--space-2) 0;font-family:var(--font-editorial);font-size:var(--text-xl);line-height:var(--leading-heading)}.catalog-row h2 a,.exercise-card h2 a,.key-list h2 a,.exam-list h2 a,.search-results h2 a{text-decoration:none}.catalog-row h2 a:hover,.exercise-card h2 a:hover,.key-list h2 a:hover,.exam-list h2 a:hover,.search-results h2 a:hover{color:var(--color-brand);text-underline-offset:.2em;text-decoration:underline}.catalog-row p{max-width:64ch;color:var(--color-ink-muted);margin:0}.catalog-row__meta{justify-items:start;gap:var(--space-2);color:var(--color-ink-muted);font-size:var(--text-sm);display:grid}.exercise-grid{border-bottom:var(--border-thin) solid var(--color-line);grid-template-columns:repeat(3,1fr);display:grid}.exercise-card{min-height:18rem;padding:var(--space-6);border-right:var(--border-thin) solid var(--color-line);border-bottom:var(--border-thin) solid var(--color-line);display:grid}.exercise-card:nth-child(3n){border-right:0}.exercise-card__number{color:var(--color-line-strong);font-family:var(--font-editorial);font-size:var(--text-2xl)}.exercise-card__footer{color:var(--color-ink-muted);font-size:var(--text-sm);justify-content:space-between;align-items:end;margin-top:auto;display:flex}.key-list{margin-top:var(--space-8);border-top:var(--border-thin) solid var(--color-line)}.key-list article{gap:var(--space-6);padding-block:var(--space-6);border-bottom:var(--border-thin) solid var(--color-line);grid-template-columns:1fr auto;display:grid}.key-list article>div:last-child{justify-items:end;gap:var(--space-1);color:var(--color-ink-muted);font-size:var(--text-sm);display:grid}.library-grid{gap:var(--space-8) var(--space-4);padding-block:var(--space-8);grid-template-columns:repeat(3,1fr);display:grid}.library-grid article{border-bottom:var(--border-thin) solid var(--color-line);min-width:0;padding-bottom:var(--space-6)}.library-grid article.is-featured{grid-column:span 2}.library-visual{min-height:14rem;margin-bottom:var(--space-4);background:var(--color-brand-soft);place-items:center;display:grid;position:relative;overflow:hidden}.library-visual>span{z-index:1;font-family:var(--font-editorial);font-size:var(--text-display);position:relative}.library-visual i{border:var(--border-thin) solid var(--color-brand);border-radius:var(--radius-round);width:12rem;height:12rem;position:absolute}.library-visual i:after{border-top:var(--border-thin) solid var(--color-brand);content:"";position:absolute;inset:50% -70% auto;rotate:-28deg}.library-grid p{color:var(--color-ink-muted)}.library-grid small{color:var(--color-brand);font-weight:600}.exam-list{border-top:var(--border-thin) solid var(--color-line)}.exam-list article{gap:var(--space-6);padding-block:var(--space-6);border-bottom:var(--border-thin) solid var(--color-line);grid-template-columns:4rem 1fr auto;align-items:center;display:grid}.exam-list__grade{border:var(--border-thin) solid var(--color-brand);border-radius:var(--radius-round);width:3.5rem;height:3.5rem;color:var(--color-brand);font-family:var(--font-editorial);font-size:var(--text-xl);place-items:center;display:grid}.exam-list p{color:var(--color-ink-muted);margin:0}.grade-switcher{gap:var(--space-2);padding-block:var(--space-6);border-bottom:var(--border-thin) solid var(--color-line);display:flex}.grade-switcher a{padding:var(--space-2) var(--space-4);border:var(--border-thin) solid var(--color-line-strong);border-radius:var(--radius-round);text-decoration:none}.grade-switcher a[aria-current=page]{border-color:var(--color-brand);background:var(--color-brand);color:var(--color-surface)}.roadmap-board{gap:var(--space-12);padding-block:var(--space-12);grid-template-columns:minmax(16rem,4fr) minmax(0,8fr);display:grid}.roadmap-board h2{margin:var(--space-3) 0;font-family:var(--font-editorial);font-size:var(--text-2xl);font-weight:500;line-height:var(--leading-heading)}.roadmap-board header p{color:var(--color-ink-muted)}.knowledge-path{gap:var(--space-6);margin:0;padding:0;list-style:none;display:grid;position:relative}.knowledge-path:before{width:var(--border-thin);background:var(--color-line-strong);content:"";position:absolute;inset:1.6rem auto 1.6rem 1.6rem}.knowledge-path li{gap:var(--space-4);grid-template-columns:3.25rem 1fr;align-items:center;display:grid;position:relative}.knowledge-node{z-index:1;border:var(--border-thin) solid var(--color-line-strong);border-radius:var(--radius-round);background:var(--color-canvas);place-items:center;width:3.25rem;height:3.25rem;display:grid}.knowledge-path li.is-complete .knowledge-node{border-color:var(--color-brand);background:var(--color-brand);color:var(--color-surface)}.knowledge-path li.is-current .knowledge-node{border-color:var(--color-brand);background:var(--color-insight);box-shadow:0 0 0 var(--space-2) var(--color-insight-soft)}.knowledge-path li>div{justify-content:space-between;align-items:center;gap:var(--space-4);padding:var(--space-4);border-bottom:var(--border-thin) solid var(--color-line);display:flex}.knowledge-path a{color:var(--color-brand);font-family:var(--font-editorial);font-size:var(--text-lg);text-underline-offset:.25em;font-weight:600}.roadmap-legend{gap:var(--space-6);padding-block:var(--space-6);border-top:var(--border-thin) solid var(--color-line);flex-wrap:wrap;display:flex}.search-page__form{width:min(100%,48rem);min-height:4rem;margin-block:var(--space-8)}.search-page__form input{font-family:var(--font-editorial);font-size:var(--text-lg)}.search-suggestions{gap:var(--space-3);color:var(--color-ink-muted);flex-wrap:wrap;align-items:center;display:flex}.search-suggestions a{padding:var(--space-1) var(--space-3);border:var(--border-thin) solid var(--color-line-strong);border-radius:var(--radius-round);text-decoration:none}.search-results{border-top:var(--border-thin) solid var(--color-line)}.search-results article{gap:var(--space-4);padding-block:var(--space-6);border-bottom:var(--border-thin) solid var(--color-line);grid-template-columns:3rem 1fr;display:grid}.search-results article>span{color:var(--color-line-strong);font-family:var(--font-editorial);font-size:var(--text-xl)}.search-results small{color:var(--color-brand);text-transform:uppercase;font-weight:600}.search-results p{max-width:60ch;color:var(--color-ink-muted);margin:0}.search-featured{justify-content:space-between;gap:var(--space-6);margin-top:var(--space-12);padding:var(--space-6);border:var(--border-thin) solid var(--color-line);display:flex}.search-featured a{color:var(--color-brand);font-family:var(--font-editorial);font-size:var(--text-lg);font-weight:600}.lesson-page{padding-bottom:var(--space-24)}.lesson-hero{gap:var(--space-12);padding:var(--space-8) 0 var(--space-12);border-bottom:var(--border-thin) solid var(--color-ink);grid-template-columns:minmax(0,8fr) minmax(16rem,4fr);display:grid}.lesson-hero>div>p{max-width:58ch;font-family:var(--font-editorial);font-size:var(--text-lg)}.lesson-hero aside{padding-left:var(--space-6);border-left:var(--border-thin) solid var(--color-line)}.lesson-hero aside>span{color:var(--color-brand);font-size:var(--text-xs);text-transform:uppercase;font-weight:600}.lesson-hero aside ul{padding-left:var(--space-6);margin-bottom:0}.lesson-mode-nav{gap:var(--space-8);border-bottom:var(--border-thin) solid var(--color-line);display:flex}.lesson-mode-nav a{padding-block:var(--space-4);color:var(--color-ink-muted);text-decoration:none;position:relative}.lesson-mode-nav a[aria-current=page]{color:var(--color-brand);font-weight:600}.lesson-mode-nav a[aria-current=page]:after{height:var(--border-emphasis);background:var(--color-brand);content:"";position:absolute;inset:auto 0 -1px}.lesson-preview{max-width:70rem;padding-top:var(--space-12);margin-inline:auto}.lead-question{max-width:58rem;margin-bottom:var(--space-16)}.lead-question>span,.definition-pair>div>span,.lesson-next span,.thinking-note span,.mode-footer+span{color:var(--color-brand);font-size:var(--text-xs);text-transform:uppercase;font-weight:600}.lead-question h2{margin:var(--space-3) 0;font-family:var(--font-editorial);font-size:var(--text-2xl);font-weight:500;line-height:var(--leading-heading)}.lead-question p{color:var(--color-ink-muted);font-family:var(--font-editorial);font-size:var(--text-lg)}.definition-pair{margin-bottom:var(--space-16);border-block:var(--border-thin) solid var(--color-line);grid-template-columns:1fr 1fr;display:grid}.definition-pair>div{padding:var(--space-8)}.definition-pair>div:first-child{border-right:var(--border-thin) solid var(--color-line)}.definition-pair h2{margin:var(--space-3) 0;font-family:var(--font-editorial);font-size:var(--text-xl)}.definition-pair p{font-family:var(--font-editorial);font-size:var(--text-lg)}.factor-demo{gap:var(--space-12);margin-bottom:var(--space-16);grid-template-columns:1fr 1fr;align-items:center;display:grid}.factor-demo__visual{place-content:center;justify-items:center;gap:var(--space-6);background:var(--color-brand-soft);min-height:22rem;display:grid}.factor-demo__visual>div{gap:var(--space-2);display:flex}.factor-demo__visual i{border-radius:var(--radius-round);background:var(--color-brand);width:.8rem;height:.8rem}.factor-demo__visual i:nth-child(7){background:var(--color-insight);box-shadow:0 0 0 var(--space-2) var(--color-insight-soft)}.factor-demo__visual strong{font-family:var(--font-editorial);font-size:var(--text-xl)}.factor-demo h2{font-family:var(--font-editorial);font-size:var(--text-2xl);font-weight:500;line-height:var(--leading-heading)}.factor-demo p{font-family:var(--font-editorial);font-size:var(--text-lg)}.lesson-next{justify-content:space-between;align-items:center;gap:var(--space-6);margin-top:var(--space-12);padding-block:var(--space-8);border-block:var(--border-thin) solid var(--color-ink);display:flex}.lesson-next h2{margin:var(--space-2) 0 0;font-family:var(--font-editorial);font-size:var(--text-xl)}.mode-page>header{padding:var(--space-8) 0 var(--space-12);border-bottom:var(--border-thin) solid var(--color-ink)}.mode-page>header>p{max-width:60ch;font-family:var(--font-editorial);font-size:var(--text-lg)}.practice-list{border-bottom:var(--border-thin) solid var(--color-line)}.practice-list article{gap:var(--space-6);padding-block:var(--space-8);border-bottom:var(--border-thin) solid var(--color-line);grid-template-columns:3rem 1fr auto;align-items:start;display:grid}.practice-list article>span{color:var(--color-line-strong);font-family:var(--font-editorial);font-size:var(--text-2xl)}.practice-list small{color:var(--color-brand);text-transform:uppercase;font-weight:600}.practice-list h2{margin:var(--space-2) 0;font-family:var(--font-editorial);font-size:var(--text-xl)}.practice-list p{color:var(--color-ink-muted);margin:0}.mode-footer{justify-content:space-between;gap:var(--space-6);padding-block:var(--space-6);display:flex}.solution-steps{max-width:56rem;margin:var(--space-12) 0;padding:0;list-style:none;position:relative}.solution-steps:before{width:var(--border-thin);background:var(--color-line);content:"";position:absolute;inset:1.3rem auto 1.3rem 1.3rem}.solution-steps li{gap:var(--space-6);padding-bottom:var(--space-8);grid-template-columns:2.6rem 1fr;display:grid;position:relative}.solution-steps li>span{z-index:1;border:var(--border-thin) solid var(--color-brand);border-radius:var(--radius-round);background:var(--color-canvas);place-items:center;width:2.6rem;height:2.6rem;display:grid}.solution-steps li.is-decision>span{background:var(--color-insight);box-shadow:0 0 0 var(--space-2) var(--color-insight-soft)}.solution-steps h2{margin:0 0 var(--space-2);font-family:var(--font-editorial);font-size:var(--text-xl)}.solution-steps p{font-family:var(--font-editorial);font-size:var(--text-lg);margin:0}.thinking-note{max-width:40rem;padding:var(--space-6);border-left:.4rem solid var(--color-insight);background:var(--color-insight-soft);margin-left:auto}.thinking-note p{margin:var(--space-2) 0 0;font-family:var(--font-editorial);font-size:var(--text-lg)}.exam-intro-grid{margin-block:var(--space-8);border-block:var(--border-thin) solid var(--color-line);grid-template-columns:repeat(3,1fr);display:grid}.exam-intro-grid section{padding:var(--space-6);border-right:var(--border-thin) solid var(--color-line)}.exam-intro-grid section:last-child{border:0}.exam-intro-grid span{font-family:var(--font-editorial);font-size:var(--text-2xl)}.exam-intro-grid p{color:var(--color-ink-muted);margin:0}.exam-scope{max-width:40rem}.exam-scope h2{font-family:var(--font-editorial)}.not-found-page{gap:var(--space-12);min-height:calc(100vh - var(--header-height));padding-block:var(--space-12);grid-template-columns:5fr 7fr;align-items:center;display:grid}.not-found-page__code{color:var(--color-line);font-family:var(--font-editorial);font-size:clamp(8rem,24vw,23rem);line-height:.75}.not-found-page section>p{max-width:52ch;font-family:var(--font-editorial);font-size:var(--text-lg)}.not-found-actions{gap:var(--space-3);margin-block:var(--space-6);flex-wrap:wrap;display:flex}.not-found-page aside{gap:var(--space-2);margin-top:var(--space-8);padding-top:var(--space-6);border-top:var(--border-thin) solid var(--color-line);display:grid}.not-found-page aside span{color:var(--color-ink-muted);font-size:var(--text-xs);text-transform:uppercase}.not-found-page aside a{color:var(--color-brand);font-family:var(--font-editorial);font-size:var(--text-lg);font-weight:600}@media (max-width:64rem){.editorial-grid{grid-template-columns:repeat(3,1fr)}.feature-story{grid-column:1/-1}.exercise-grid,.library-grid{grid-template-columns:repeat(2,1fr)}.exercise-card:nth-child(3n){border-right:var(--border-thin) solid var(--color-line)}.exercise-card:nth-child(2n){border-right:0}.roadmap-board{grid-template-columns:1fr}}@media (max-width:50rem){.home-hero,.continue-strip,.discovery-header,.lesson-hero,.factor-demo,.not-found-page{grid-template-columns:1fr}.home-hero{gap:var(--space-6);min-height:auto;padding-block:var(--space-12)}.home-hero__figure{padding:var(--space-6) 0 0;border-top:var(--border-thin) solid var(--color-line);border-left:0}.factor-figure{min-height:22rem}.continue-strip{gap:var(--space-6)}.home-section>header{grid-template-columns:1fr}.home-section>header .text-link{margin-top:var(--space-3)}.route-preview{grid-template-columns:1fr 1fr}.route-preview:before{display:none}.editorial-grid,.exercise-grid,.library-grid{grid-template-columns:1fr}.editorial-grid article,.exercise-card{border-right:0}.feature-story,.library-grid article.is-featured{grid-column:auto}.discovery-header{gap:var(--space-6);padding-block:var(--space-6) var(--space-8)}.filter-bar{flex-direction:column;align-items:stretch}.filter-bar__fields,.filter-bar label{width:100%}.catalog-row{grid-template-columns:3rem 1fr}.catalog-row__meta{grid-column:2;grid-auto-flow:column;align-items:center}.key-list article{grid-template-columns:1fr}.key-list article>div:last-child{grid-auto-flow:column;justify-content:start;justify-items:start}.exam-list article{grid-template-columns:3.5rem 1fr}.exam-list article>.status-pill{grid-column:2}.lesson-hero aside{padding:var(--space-6) 0 0;border-top:var(--border-thin) solid var(--color-line);border-left:0}.definition-pair{grid-template-columns:1fr}.definition-pair>div:first-child{border-right:0;border-bottom:var(--border-thin) solid var(--color-line)}.factor-demo__visual{min-height:17rem}.lesson-next{flex-direction:column;align-items:stretch}.lesson-next .button{width:100%}.exam-intro-grid{grid-template-columns:1fr}.exam-intro-grid section{border-right:0;border-bottom:var(--border-thin) solid var(--color-line)}.practice-list article{grid-template-columns:2.5rem 1fr}.practice-list article>.status-pill{grid-column:2}.not-found-page__code{font-size:9rem}}@media (max-width:32rem){.hero-actions,.hero-actions .button,.not-found-actions,.not-found-actions .button{width:100%}.route-preview,.catalog-row{grid-template-columns:1fr}.catalog-row__meta{grid-column:auto}.knowledge-path li>div{flex-direction:column;align-items:start}.lesson-mode-nav{gap:var(--space-4)}.mode-footer,.search-featured{flex-direction:column}}.exercise-engine{padding-bottom:var(--space-24)}.exercise-set-header{gap:var(--space-8);padding-block:var(--space-12) var(--space-8);grid-template-columns:minmax(0,1fr) max-content;align-items:end;display:grid}.exercise-set-header h1,.key-access>header h1,.key-gate h1{font-family:var(--font-editorial);font-size:var(--text-2xl);font-weight:500;line-height:var(--leading-heading);margin:0}.exercise-set-header p,.key-access>header p{max-width:var(--reading-max);margin:var(--space-3) 0 0;color:var(--color-ink-muted);font-family:var(--font-editorial);font-size:var(--text-lg)}.exercise-save-status{gap:var(--space-1);min-width:12rem;padding-left:var(--space-4);border-left:var(--border-emphasis) solid var(--color-brand);display:grid}.exercise-save-status span{font-weight:600}.exercise-save-status small{color:var(--color-ink-muted)}.exercise-progress{border-block:var(--border-thin) solid var(--color-line)}.exercise-progress ol{grid-template-columns:repeat(5,minmax(8.5rem,1fr));margin:0;padding:0;list-style:none;display:grid}.exercise-progress li+li{border-left:var(--border-thin) solid var(--color-line)}.exercise-progress button{gap:var(--space-3);width:100%;min-height:5.5rem;padding:var(--space-3);color:var(--color-ink);cursor:pointer;text-align:left;background:0 0;border:0;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;display:grid}.exercise-progress button:hover,.exercise-progress button.is-active{background:var(--color-surface)}.exercise-progress button.is-active{box-shadow:inset 0 calc(-1 * var(--border-emphasis)) var(--color-brand)}.exercise-progress button>span:first-child{color:var(--color-brand);font-size:var(--text-xs);font-weight:600}.exercise-progress button>span:nth-child(2){min-width:0;display:grid}.exercise-progress b,.exercise-progress small{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.exercise-progress b{font-size:var(--text-sm)}.exercise-progress small{color:var(--color-ink-muted);font-size:var(--text-xs)}.exercise-progress__mark{border:var(--border-thin) solid var(--color-line-strong);border-radius:var(--radius-round);width:.7rem;height:.7rem}.exercise-progress__mark--draft{border-color:var(--color-brand)}.exercise-progress__mark--attempted{border-color:var(--color-warning);background:var(--color-warning-soft)}.exercise-progress__mark--correct{border-color:var(--color-success);background:var(--color-success)}.exercise-workspace{gap:clamp(var(--space-8), 5vw, var(--space-16));padding-block:var(--space-12);grid-template-columns:minmax(0,8fr) minmax(16rem,3fr);display:grid}.exercise-main{min-width:0}.exercise-meta{gap:var(--space-2);color:var(--color-ink-muted);font-size:var(--text-xs);letter-spacing:var(--tracking-label);text-transform:uppercase;flex-wrap:wrap;display:flex}.exercise-meta span+span:before{margin-right:var(--space-2);color:var(--color-line-strong);content:"·"}.exercise-main>h2{max-width:27ch;margin:var(--space-4) 0 var(--space-8);font-family:var(--font-editorial);font-size:clamp(1.8rem,4vw,3.25rem);font-weight:500;line-height:var(--leading-heading)}.reasoning-brief{margin-bottom:var(--space-8);border-block:var(--border-thin) solid var(--color-line);grid-template-columns:1fr 1fr;display:grid}.reasoning-brief section{padding:var(--space-5,1.25rem) var(--space-6) var(--space-5,1.25rem) 0}.reasoning-brief section+section{padding-inline:var(--space-6) 0;border-left:var(--border-thin) solid var(--color-line)}.reasoning-brief section>span{color:var(--color-brand);font-size:var(--text-xs);letter-spacing:var(--tracking-label);text-transform:uppercase;font-weight:700}.reasoning-brief ul{margin:var(--space-3) 0 0;padding-left:var(--space-4);font-family:var(--font-editorial);font-size:var(--text-lg)}.exercise-response{gap:var(--space-6);margin-top:var(--space-8);display:grid}.exercise-options{gap:var(--space-3);border:0;grid-template-columns:repeat(2,1fr);margin:0;padding:0;display:grid}.exercise-options legend{margin-bottom:var(--space-3);color:var(--color-ink-muted);font-size:var(--text-sm)}.exercise-options label{cursor:pointer;position:relative}.exercise-options input{opacity:0;position:absolute}.exercise-options label>span{align-items:center;gap:var(--space-4);min-height:4.5rem;padding:var(--space-4);border:var(--border-thin) solid var(--color-line-strong);border-radius:var(--radius-sm);background:var(--color-surface);font-family:var(--font-editorial);font-size:var(--text-xl);display:flex}.exercise-options label b{border:var(--border-thin) solid var(--color-line-strong);border-radius:var(--radius-round);width:2rem;height:2rem;font-family:var(--font-interface);font-size:var(--text-sm);flex:none;place-items:center;display:grid}.exercise-options input:checked+span{border-color:var(--color-brand);background:var(--color-brand-soft);color:var(--color-brand)}.exercise-options input:checked+span b{border-color:var(--color-brand);background:var(--color-brand);color:var(--color-surface)}.exercise-options input:focus-visible+span{outline:var(--border-emphasis) solid var(--color-brand);outline-offset:.2rem;box-shadow:0 0 0 .25rem var(--color-insight-soft)}.exercise-field{gap:var(--space-2);max-width:45rem;display:grid}.exercise-field>span{font-weight:600}.exercise-field input,.exercise-field textarea{border:var(--border-thin) solid var(--color-line-strong);border-radius:var(--radius-sm);background:var(--color-surface);width:100%;color:var(--color-ink);outline:0}.exercise-field input{min-height:3.75rem;padding:var(--space-3) var(--space-4);font-family:var(--font-math);font-size:var(--text-xl)}.exercise-field textarea{resize:vertical;padding:var(--space-4);font-family:var(--font-editorial);font-size:var(--text-lg);line-height:var(--leading-body)}.exercise-field input:focus,.exercise-field textarea:focus{border-color:var(--color-brand);box-shadow:0 0 0 .25rem var(--color-insight-soft)}.exercise-field small{color:var(--color-ink-muted)}.exercise-field__input-wrap{position:relative}.exercise-field__input-wrap>span{top:50%;right:var(--space-4);color:var(--color-ink-muted);position:absolute;translate:0 -50%}.exercise-field__input-wrap:has(>span) input{padding-right:var(--space-12)}.exercise-actions{align-items:center;gap:var(--space-4);display:flex}.exercise-actions>span{color:var(--color-ink-muted);font-size:var(--text-sm)}.exercise-feedback{margin-top:var(--space-6);padding:var(--space-4) var(--space-6);border-left:.3rem solid;outline:0}.exercise-feedback>span{font-size:var(--text-xs);letter-spacing:var(--tracking-label);text-transform:uppercase;font-weight:700}.exercise-feedback p{max-width:var(--reading-max);margin:var(--space-1) 0 0;color:var(--color-ink)}.exercise-feedback--correct{background:var(--color-success-soft);color:var(--color-success)}.exercise-feedback--incorrect{background:var(--color-danger-soft);color:var(--color-danger)}.exercise-feedback--pending_review{background:var(--color-warning-soft);color:var(--color-warning)}.self-review{gap:var(--space-3);margin-top:var(--space-6);padding:var(--space-6);border-block:var(--border-thin) solid var(--color-line);display:grid}.self-review h3,.self-review p{margin:0}.self-review h3{font-family:var(--font-editorial);font-size:var(--text-xl)}.self-review>label{gap:var(--space-3);cursor:pointer;grid-template-columns:auto 1fr;align-items:start;display:grid}.self-review input{width:1.2rem;height:1.2rem;accent-color:var(--color-brand);margin-top:.2rem}.self-review .button{margin-top:var(--space-2);justify-self:start}.attempt-history{margin-top:var(--space-8);border-top:var(--border-thin) solid var(--color-line)}.attempt-history summary{padding-block:var(--space-4);cursor:pointer;font-weight:600}.attempt-history ol{margin:0;padding:0;list-style:none}.attempt-history li{gap:var(--space-4);padding-block:var(--space-3);border-top:var(--border-thin) solid var(--color-line);font-size:var(--text-sm);grid-template-columns:4rem minmax(0,1fr) max-content;display:grid}.attempt-history time,.attempt-history b,.attempt-history>p{color:var(--color-ink-muted)}.attempt-history li>span{overflow-wrap:anywhere}.hint-panel{top:calc(var(--header-height) + var(--space-6));padding:var(--space-6);border-top:var(--border-emphasis) solid var(--color-ink);background:var(--color-surface);align-self:start;position:sticky}.hint-panel h2{font-family:var(--font-editorial);font-size:var(--text-xl);margin:0}.hint-panel>p{margin:var(--space-2) 0 var(--space-6);color:var(--color-ink-muted)}.hint-panel ol{margin:0 0 var(--space-6);padding:0;list-style:none;display:grid}.hint-panel li{gap:var(--space-3);min-height:4.5rem;padding-block:var(--space-3);border-top:var(--border-thin) solid var(--color-line);grid-template-columns:2rem 1fr;display:grid}.hint-panel li>span{border:var(--border-thin) solid var(--color-line-strong);border-radius:var(--radius-round);width:1.7rem;height:1.7rem;color:var(--color-ink-muted);font-size:var(--text-xs);place-items:center;display:grid}.hint-panel li.is-open>span{border-color:var(--color-insight-ink);background:var(--color-insight);color:var(--color-insight-ink)}.hint-panel li b,.hint-panel li small{display:block}.hint-panel li small{color:var(--color-ink-muted)}.hint-panel li p{margin:var(--space-1) 0 0;font-family:var(--font-editorial)}.hint-panel .button{width:100%}.hint-panel__rule{margin-top:var(--space-3);color:var(--color-ink-muted);display:block}.hint-panel .hint-panel__complete{padding:var(--space-3);background:var(--color-insight-soft);color:var(--color-insight-ink);font-size:var(--text-sm);margin:0}.exercise-geometry{margin:var(--space-8) 0;border:var(--border-thin) solid var(--color-line-strong);background:var(--color-surface)}.exercise-geometry__toolbar{gap:var(--space-4);padding:var(--space-3) var(--space-4);border-bottom:var(--border-thin) solid var(--color-line);grid-template-columns:max-content 1fr max-content;align-items:center;display:grid}.exercise-geometry__toolbar input{width:100%;accent-color:var(--color-brand)}.exercise-geometry__toolbar button{color:var(--color-brand);cursor:pointer;text-underline-offset:.2em;background:0 0;border:0;font-weight:600;text-decoration:underline}.exercise-geometry__board{touch-action:none;min-height:19rem}.exercise-geometry figcaption{padding:var(--space-3) var(--space-4);border-top:var(--border-thin) solid var(--color-line);color:var(--color-ink-muted);font-size:var(--text-sm)}.exercise-footer{justify-content:space-between;gap:var(--space-8);padding:var(--space-6);border-block:var(--border-thin) solid var(--color-line);align-items:center;display:flex}.exercise-footer span:first-child{font-size:var(--text-sm);font-weight:700}.exercise-footer p{margin:var(--space-1) 0 0;color:var(--color-ink-muted)}.key-locked{padding:var(--space-3) var(--space-4);border:var(--border-thin) solid var(--color-line-strong);color:var(--color-ink-muted)}.key-access-loading{min-height:16rem;padding-top:var(--space-12);color:var(--color-ink-muted)}.key-gate{place-content:center;justify-items:start;gap:var(--space-4);text-align:left;max-width:42rem;min-height:28rem;margin-inline:auto;display:grid}.key-gate>span{color:var(--color-brand);font-size:3rem;line-height:1}.key-gate p{color:var(--color-ink-muted);font-family:var(--font-editorial);font-size:var(--text-lg);margin:0}.key-access>header{padding-block:var(--space-12) var(--space-8)}.key-exercise-list{margin:0;padding:0;list-style:none}.key-exercise-list>li{gap:var(--space-4);padding-block:var(--space-8);border-top:var(--border-thin) solid var(--color-line);grid-template-columns:4rem minmax(0,1fr);display:grid}.key-exercise-list>li>span{color:var(--color-brand);font-family:var(--font-editorial);font-size:var(--text-xl)}.key-exercise-list h2{margin:var(--space-1) 0 var(--space-3);font-family:var(--font-editorial);font-size:var(--text-xl)}.key-exercise-list small{color:var(--color-brand);text-transform:uppercase;font-weight:600}.key-exercise-list p{max-width:var(--reading-max);color:var(--color-ink-muted)}.key-exercise-list .is-locked{opacity:.62}.key-exercise-list aside{max-width:48rem;margin-top:var(--space-6);padding:var(--space-4);border-left:.35rem solid var(--color-insight);background:var(--color-insight-soft)}.key-exercise-list aside p{margin:var(--space-1) 0 0;color:var(--color-insight-ink)}@media (max-width:72rem){.exercise-progress{overflow-x:auto}.exercise-progress ol{grid-template-columns:repeat(5,12rem);width:max-content}}@media (max-width:56rem){.exercise-set-header,.exercise-workspace{grid-template-columns:1fr}.exercise-save-status{justify-self:start}.hint-panel{grid-row:2;position:static}}@media (max-width:44rem){.exercise-set-header{padding-top:var(--space-8)}.exercise-options,.reasoning-brief{grid-template-columns:1fr}.reasoning-brief section,.reasoning-brief section+section{padding:var(--space-4) 0;border-left:0}.reasoning-brief section+section{border-top:var(--border-thin) solid var(--color-line)}.exercise-actions,.exercise-footer{flex-direction:column;align-items:stretch}.exercise-actions .button,.exercise-footer .button{width:100%}.attempt-history li{grid-template-columns:3.5rem 1fr}.attempt-history li b{grid-column:2}.exercise-geometry__toolbar{grid-template-columns:1fr}.key-exercise-list>li{grid-template-columns:2.5rem minmax(0,1fr)}}.lesson-reading-layout{gap:clamp(var(--space-6), 4vw, var(--space-16));padding-block:var(--space-8) var(--space-24);grid-template-columns:minmax(11rem,2fr) minmax(0,8fr) minmax(0,1fr);align-items:start;display:grid}.lesson-toc{top:calc(var(--header-height) + var(--space-6));color:var(--color-ink-muted);font-size:var(--text-sm);grid-column:1;position:sticky}.lesson-toc summary{cursor:pointer;color:var(--color-ink);font-weight:600}.lesson-toc ol{gap:var(--space-1);margin:var(--space-4) 0 0;border-left:var(--border-thin) solid var(--color-line);padding:0;list-style:none;display:grid}.lesson-toc a{gap:var(--space-2);padding:var(--space-2) 0 var(--space-2) var(--space-3);grid-template-columns:2rem 1fr;text-decoration:none;display:grid}.lesson-toc a:hover{color:var(--color-brand)}.lesson-toc a span{font-size:var(--text-xs);font-variant-numeric:tabular-nums}.lesson-content{grid-column:2;min-width:0}.lesson-block{scroll-margin-top:calc(var(--header-height) + var(--space-6));margin-bottom:clamp(var(--space-12), 7vw, var(--space-24))}.lesson-block__header{max-width:var(--reading-max);margin-bottom:var(--space-6)}.lesson-block__header h2,.lesson-concept h2,.worked-example>h2,.common-mistake h2{margin:var(--space-2) 0;font-family:var(--font-editorial);font-size:clamp(1.75rem,4vw,2.75rem);line-height:var(--leading-heading)}.lesson-block__header p,.lesson-concept>p{max-width:var(--reading-max);color:var(--color-ink-muted);font-family:var(--font-editorial);font-size:var(--text-lg);margin:0}.lesson-video-block{padding-top:var(--space-4)}.video-lesson{border-block:var(--border-thin) solid var(--color-line)}.video-lesson__stage{background:var(--color-ink);position:relative}.video-lesson video{aspect-ratio:16/9;background:var(--color-ink);width:100%}.video-lesson__error{inset:auto var(--space-4) var(--space-4);padding:var(--space-3);background:var(--color-danger-soft);color:var(--color-danger);margin:0;position:absolute}.video-lesson__tools{justify-content:space-between;align-items:center;gap:var(--space-3);padding-block:var(--space-4);display:flex}.video-lesson__tools label{align-items:center;gap:var(--space-2);font-size:var(--text-sm);font-weight:600;display:flex}.video-lesson__tools select{border:var(--border-thin) solid var(--color-line-strong);border-radius:var(--radius-sm);background:var(--color-surface);min-height:2.25rem;color:var(--color-ink)}.video-lesson__caption-note{color:var(--color-ink-muted);font-size:var(--text-sm)}.video-chapters{gap:var(--space-4);padding-block:var(--space-4) var(--space-6);border-top:var(--border-thin) solid var(--color-line);grid-template-columns:8rem 1fr;display:grid}.video-chapters>span{color:var(--color-ink-muted);font-size:var(--text-xs);letter-spacing:var(--tracking-label);text-transform:uppercase;font-weight:600}.video-chapters ol{gap:var(--space-2);grid-template-columns:repeat(3,1fr);margin:0;padding:0;list-style:none;display:grid}.video-chapters button{gap:var(--space-1);width:100%;padding:var(--space-3);border:0;border-left:var(--border-emphasis) solid var(--color-line-strong);color:var(--color-ink);cursor:pointer;text-align:left;background:0 0;display:grid}.video-chapters button:hover{border-color:var(--color-brand);background:var(--color-brand-soft)}.video-chapters time{color:var(--color-brand);font-size:var(--text-xs);font-variant-numeric:tabular-nums;font-weight:600}.lesson-transcript{border-block:var(--border-thin) solid var(--color-line)}.lesson-transcript summary{justify-content:space-between;align-items:baseline;gap:var(--space-4);padding-block:var(--space-4);cursor:pointer;font-weight:600;display:flex}.lesson-transcript summary small{color:var(--color-ink-muted);font-weight:400}.lesson-transcript ol{padding:0 0 var(--space-6);margin:0;list-style:none}.lesson-transcript li{gap:var(--space-4);padding-block:var(--space-3);border-top:var(--border-thin) solid var(--color-line);grid-template-columns:4rem 1fr;display:grid}.lesson-transcript li button{color:var(--color-brand);cursor:pointer;font-variant-numeric:tabular-nums;text-underline-offset:.2em;background:0 0;border:0;align-self:start;padding:0;font-weight:600;text-decoration:underline}.lesson-transcript li p{font-family:var(--font-editorial);font-size:var(--text-lg);margin:0}.lesson-concept{max-width:52rem;padding-left:var(--space-6);border-left:var(--border-emphasis) solid var(--color-brand)}.lesson-definition{gap:var(--space-4) var(--space-8);padding-block:var(--space-6);border-block:var(--border-thin) solid var(--color-line);grid-template-columns:minmax(8rem,2fr) minmax(0,6fr);display:grid}.lesson-definition+.lesson-definition{margin-top:calc(-1 * clamp(var(--space-12), 7vw, var(--space-24)));border-top:0}.lesson-definition>span{color:var(--color-ink-muted);font-size:var(--text-xs);letter-spacing:var(--tracking-label);text-transform:uppercase;grid-row:1/span 2;font-weight:600}.lesson-definition h2{font-family:var(--font-editorial);font-size:var(--text-2xl);margin:0}.lesson-definition p{max-width:var(--reading-max);font-family:var(--font-editorial);font-size:var(--text-lg);margin:0}.lesson-formula{padding:var(--space-6);border-left:.4rem solid var(--color-insight);background:var(--color-insight-soft)}.lesson-formula h2{font-family:var(--font-editorial);margin:0}.lesson-formula p{max-width:var(--reading-max);margin-bottom:0}.lesson-figure{margin:0}.lesson-figure>button{border:var(--border-thin) solid var(--color-line-strong);border-radius:var(--radius-sm);background:var(--color-surface);cursor:zoom-in;width:100%;padding:0;position:relative;overflow:hidden}.lesson-figure>button img{width:100%;height:auto}.lesson-figure>button span{right:var(--space-3);bottom:var(--space-3);padding:var(--space-2) var(--space-3);border:var(--border-thin) solid var(--color-line-strong);background:var(--color-surface-raised);color:var(--color-ink);font-size:var(--text-sm);font-weight:600;position:absolute}.lesson-figure figcaption{max-width:var(--reading-max);padding-top:var(--space-3);color:var(--color-ink-muted);font-size:var(--text-sm)}.figure-lightbox{width:min(94vw,75rem);max-height:92vh;padding:var(--space-4);border:var(--border-thin) solid var(--color-line-strong);background:var(--color-surface-raised);color:var(--color-ink);box-shadow:var(--shadow-floating)}.figure-lightbox::backdrop{background:var(--color-scrim)}.figure-lightbox>div{justify-content:space-between;gap:var(--space-4);padding-bottom:var(--space-3);display:flex}.figure-lightbox>div button{color:var(--color-brand);cursor:pointer;background:0 0;border:0;font-weight:600}.figure-lightbox img{width:100%;height:auto}.factor-graph{gap:var(--space-8);padding-block:var(--space-8);border-block:var(--border-thin) solid var(--color-line);grid-template-columns:minmax(16rem,4fr) minmax(0,7fr);display:grid}.factor-graph__copy h2{margin:var(--space-2) 0;font-family:var(--font-editorial);font-size:var(--text-2xl)}.factor-graph__copy>p{font-family:var(--font-editorial);font-size:var(--text-lg)}.factor-graph__copy>label{margin-top:var(--space-6);font-size:var(--text-sm);font-weight:600;display:block}.factor-graph__control{gap:var(--space-3);margin-top:var(--space-2);grid-template-columns:1fr 4.5rem;align-items:center;display:grid}.factor-graph__control input[type=range]{width:100%;accent-color:var(--color-brand)}.factor-graph__control input[type=number]{border:var(--border-thin) solid var(--color-line-strong);border-radius:var(--radius-sm);background:var(--color-surface);width:100%;min-height:2.75rem;color:var(--color-ink);text-align:center}.factor-graph__result{padding:var(--space-3);border-left:var(--border-emphasis) solid var(--color-insight);background:var(--color-insight-soft);font-family:var(--font-interface)!important;font-size:var(--text-base)!important}.factor-graph__board{border:var(--border-thin) solid var(--color-line-strong);border-radius:var(--radius-sm);background:var(--color-surface-raised);touch-action:none;width:100%;min-height:22rem;position:relative;overflow:hidden}.factor-graph__board svg text{cursor:default;-webkit-user-select:none;user-select:none}.JXGtext{font-family:var(--font-interface);background:0 0;margin:0;padding:0}.factor-table{width:100%;margin-top:var(--space-4);border-collapse:collapse;font-size:var(--text-sm)}.factor-table caption{padding-bottom:var(--space-2);text-align:left;font-weight:600}.factor-table th,.factor-table td{padding:var(--space-2) var(--space-3);border-bottom:var(--border-thin) solid var(--color-line);text-align:left}.lesson-interactive__fallback{margin:var(--space-3) 0 0;color:var(--color-ink-muted);font-size:var(--text-sm)}.worked-example>ol{margin:var(--space-8) 0 0;padding:0;list-style:none}.worked-example>ol li{gap:var(--space-4);padding-block:var(--space-4);border-top:var(--border-thin) solid var(--color-line);grid-template-columns:3rem 1fr;display:grid}.worked-example>ol li>span{color:var(--color-brand);font-weight:600}.worked-example h3{font-family:var(--font-editorial);font-size:var(--text-xl);margin:0}.worked-example li p{margin:var(--space-1) 0 0;color:var(--color-ink-muted);font-family:var(--font-editorial);font-size:var(--text-lg)}.checkpoint{padding:clamp(var(--space-4), 5vw, var(--space-8));border:var(--border-emphasis) solid var(--color-ink);background:var(--color-surface)}.checkpoint__heading{justify-content:space-between;gap:var(--space-4);padding-bottom:var(--space-4);border-bottom:var(--border-thin) solid var(--color-line);display:flex}.checkpoint__heading span{color:var(--color-brand);font-size:var(--text-sm);letter-spacing:var(--tracking-label);text-transform:uppercase;font-weight:700}.checkpoint__heading strong{color:var(--color-ink-muted);font-size:var(--text-sm);font-weight:500}.checkpoint fieldset{padding:var(--space-6) 0;border:0;margin:0}.checkpoint legend{max-width:45rem;font-family:var(--font-editorial);font-size:var(--text-xl);font-weight:600}.checkpoint__options{gap:var(--space-2);margin-top:var(--space-6);grid-template-columns:repeat(4,1fr);display:grid}.checkpoint__options label{cursor:pointer;position:relative}.checkpoint__options input{opacity:0;position:absolute}.checkpoint__options span{border:var(--border-thin) solid var(--color-line-strong);border-radius:var(--radius-sm);background:var(--color-surface-raised);min-height:4rem;font-family:var(--font-editorial);font-size:var(--text-xl);place-items:center;font-weight:600;display:grid}.checkpoint__options input:checked+span{border-color:var(--color-brand);background:var(--color-brand-soft);color:var(--color-brand)}.checkpoint__options input:focus-visible+span{outline:var(--border-emphasis) solid var(--color-brand);outline-offset:.2rem;box-shadow:0 0 0 .25rem var(--color-insight-soft)}.checkpoint__footer{gap:var(--space-4);align-items:start;display:grid}.checkpoint__footer .button{justify-self:start}.checkpoint__feedback{padding:var(--space-3) var(--space-4);border-left:var(--border-emphasis) solid currentColor;margin:0}.checkpoint__feedback--correct{background:var(--color-success-soft);color:var(--color-success)}.checkpoint__feedback--incorrect{background:var(--color-warning-soft);color:var(--color-warning)}.common-mistake{padding:var(--space-6);border-left:var(--border-emphasis) solid var(--color-danger);background:var(--color-danger-soft)}.common-mistake>span{color:var(--color-danger);font-size:var(--text-sm);text-transform:uppercase;font-weight:700}.common-mistake dl{gap:var(--space-6);grid-template-columns:1fr 1fr;margin-bottom:0;display:grid}.common-mistake dt{font-weight:600}.common-mistake dd{margin:var(--space-1) 0 0}.source-note{padding-top:var(--space-4);border-top:var(--border-thin) solid var(--color-line);color:var(--color-ink-muted);font-size:var(--text-sm)}.source-note p{margin:var(--space-1) 0 0}.lesson-completion{justify-content:space-between;align-items:center;gap:var(--space-8);padding:var(--space-8);border-top:var(--border-emphasis) solid var(--color-ink);background:var(--color-insight-soft);display:flex}.lesson-completion span{color:var(--color-brand);font-size:var(--text-sm);text-transform:uppercase;font-weight:700}.lesson-completion h2{margin:var(--space-1) 0;font-family:var(--font-editorial);font-size:var(--text-xl)}.lesson-completion p{max-width:50ch;margin:0}@media (max-width:64rem){.lesson-reading-layout{grid-template-columns:minmax(10rem,2fr) minmax(0,7fr)}.factor-graph{grid-template-columns:1fr}}@media (max-width:50rem){.lesson-reading-layout{padding-top:var(--space-4);display:block}.lesson-toc{margin-bottom:var(--space-8);padding:var(--space-4);border-block:var(--border-thin) solid var(--color-line);position:static}.lesson-toc ol{grid-template-columns:1fr 1fr}.video-chapters,.video-chapters ol,.lesson-definition{grid-template-columns:1fr}.lesson-definition>span{grid-row:auto}.checkpoint__options{grid-template-columns:1fr 1fr}.lesson-completion{flex-direction:column;align-items:stretch}.lesson-completion .button{width:100%}}@media (max-width:32rem){.lesson-toc ol,.checkpoint__options,.common-mistake dl{grid-template-columns:1fr}.video-lesson__tools,.lesson-transcript summary{flex-direction:column;align-items:stretch}.lesson-transcript li{gap:var(--space-2);grid-template-columns:3.5rem 1fr}.lesson-concept{padding-left:var(--space-4)}.factor-graph__board{min-height:18rem}}.exercise-submit-error{margin:var(--space-3) 0 0;padding:var(--space-3) var(--space-4);border-left:var(--border-emphasis) solid var(--color-danger);background:var(--color-danger-soft);color:var(--color-danger)}.key-access__header{justify-content:space-between;align-items:end;gap:var(--space-8);padding-block:var(--space-12) var(--space-8);border-bottom:var(--border-thin) solid var(--color-ink);display:flex}.key-access__trust{gap:var(--space-1);min-width:14rem;padding-left:var(--space-4);border-left:var(--border-emphasis) solid var(--color-success);display:grid}.key-access__trust span{font-weight:600}.key-access__trust small{color:var(--color-ink-muted)}.key-reader{gap:clamp(var(--space-6), 4vw, var(--space-12));padding-block:var(--space-8) var(--space-16);grid-template-columns:minmax(13rem,2.4fr) minmax(0,9.6fr);align-items:start;display:grid}.key-reader__index{top:calc(var(--header-height) + var(--space-4));position:sticky}.key-reader__index>p{margin:0 0 var(--space-3);color:var(--color-ink-muted);font-size:var(--text-xs);letter-spacing:var(--tracking-label);text-transform:uppercase;font-weight:700}.key-reader__index ol{border-top:var(--border-thin) solid var(--color-line);margin:0;padding:0;list-style:none;display:grid}.key-reader__index li{border-bottom:var(--border-thin) solid var(--color-line)}.key-reader__index a,.key-reader__index li>div{gap:var(--space-2);min-height:4.5rem;padding:var(--space-3) var(--space-2);grid-template-columns:2rem 1fr;text-decoration:none;display:grid}.key-reader__index a:hover,.key-reader__index .is-active a{background:var(--color-brand-soft)}.key-reader__index .is-active a{box-shadow:inset var(--border-emphasis) 0 var(--color-brand)}.key-reader__index li>div{color:var(--color-ink-muted);opacity:.7}.key-reader__index a>span:first-child,.key-reader__index li>div>span:first-child{color:var(--color-brand);font-family:var(--font-editorial)}.key-reader__index a>span:last-child,.key-reader__index li>div>span:last-child{align-content:start;gap:var(--space-1);display:grid}.key-reader__index b,.key-reader__index small{line-height:1.35}.key-reader__index small{color:var(--color-ink-muted);font-size:var(--text-xs)}.solution-reader{min-width:0}.solution-reader__intro{max-width:var(--reading-max);padding-bottom:var(--space-8)}.solution-reader__intro h2,.key-selection-locked h2{margin:var(--space-2) 0 var(--space-3);font-family:var(--font-editorial);font-size:clamp(2rem,4vw,3.5rem);font-weight:500;line-height:var(--leading-heading)}.solution-reader__intro>p{font-family:var(--font-editorial);font-size:var(--text-lg);margin:0}.solution-reader__intro>small{margin-top:var(--space-3);color:var(--color-ink-muted);display:block}.solution-reader__body{gap:clamp(var(--space-6), 4vw, var(--space-12));grid-template-columns:minmax(0,7fr) minmax(15rem,4fr);align-items:start;display:grid}.solution-step-progress{justify-content:space-between;align-items:center;gap:var(--space-4);padding-block:var(--space-3);border-block:var(--border-thin) solid var(--color-line);color:var(--color-ink-muted);font-size:var(--text-sm);display:flex}.solution-step-progress>span:last-child{gap:var(--space-1);display:flex}.solution-step-progress i{width:2rem;height:var(--space-1);background:var(--color-line);display:block}.solution-step-progress i.is-open{background:var(--color-brand)}.solution-steps>ol{margin:0 0 var(--space-6);padding:0;list-style:none}.solution-steps>ol>li{padding-block:var(--space-6);border-bottom:var(--border-thin) solid var(--color-line)}.solution-steps>ol>li.is-active{border-bottom-color:var(--color-ink)}.solution-steps li>button{gap:var(--space-3);width:100%;color:var(--color-ink);cursor:pointer;text-align:left;background:0 0;border:0;grid-template-columns:2.5rem 1fr;padding:0;display:grid}.solution-steps li>button>span:first-child{color:var(--color-brand);font-family:var(--font-editorial);font-size:var(--text-xl)}.solution-steps li>button>span:last-child{gap:var(--space-1);display:grid}.solution-steps li>button small{color:var(--color-brand);font-size:var(--text-xs);letter-spacing:var(--tracking-label);text-transform:uppercase;font-weight:700}.solution-steps li>button b{font-family:var(--font-editorial);font-size:var(--text-xl);font-weight:600}.solution-steps li>div{padding-left:calc(2.5rem + var(--space-3))}.solution-steps li>div>p{font-family:var(--font-editorial);font-size:var(--text-lg)}.solution-bridge{gap:var(--space-1);padding:var(--space-4);border-left:.35rem solid var(--color-insight);background:var(--color-insight-soft);color:var(--color-insight-ink);display:grid}.solution-bridge b{font-family:var(--font-interface);font-size:var(--text-xs);letter-spacing:var(--tracking-label);text-transform:uppercase}.solution-reader__margin{top:calc(var(--header-height) + var(--space-4));position:sticky}.solution-figure{padding:var(--space-4);border:var(--border-thin) solid var(--color-line-strong);background:var(--color-surface-raised);margin:0}.solution-figure__label{color:var(--color-brand);font-size:var(--text-xs);letter-spacing:var(--tracking-label);text-transform:uppercase;font-weight:700}.solution-figure h3{margin:var(--space-2) 0 var(--space-4);font-family:var(--font-editorial);font-size:var(--text-xl)}.solution-figure__stage{gap:var(--space-2);min-height:12rem;padding:var(--space-4);background:var(--color-brand-soft);grid-template-columns:repeat(2,minmax(0,1fr));place-content:center;display:grid}.solution-figure__stage span{min-height:3.5rem;padding:var(--space-2);border:var(--border-thin) solid var(--color-brand);background:var(--color-surface-raised);font-family:var(--font-math);text-align:center;place-items:center;font-weight:600;display:grid}.solution-figure--algebra .solution-figure__stage,.solution-figure--counterexample .solution-figure__stage{grid-template-columns:1fr}.solution-figure--rectangle .solution-figure__stage{border:var(--border-emphasis) solid var(--color-brand);background-image:linear-gradient(var(--color-line) var(--border-thin), transparent var(--border-thin)), linear-gradient(90deg, var(--color-line) var(--border-thin), transparent var(--border-thin));background-size:var(--space-4) var(--space-4)}.solution-figure figcaption{margin-top:var(--space-3);color:var(--color-ink-muted);font-size:var(--text-sm)}.solution-sequence-note{max-width:52rem;margin:var(--space-8) 0 0;padding-top:var(--space-4);border-top:var(--border-thin) solid var(--color-line);color:var(--color-ink-muted);font-size:var(--text-sm)}.solution-afterword{gap:var(--space-8);margin-top:var(--space-12);display:grid}.answer-comparison{border-block:var(--border-emphasis) solid var(--color-ink);grid-template-columns:1fr 1fr;display:grid}.answer-comparison>div{min-width:0;padding:var(--space-6)}.answer-comparison>div+div{border-left:var(--border-thin) solid var(--color-line-strong)}.answer-comparison span,.solution-diagnostics span,.thinking-pattern>span{color:var(--color-brand);font-size:var(--text-xs);letter-spacing:var(--tracking-label);text-transform:uppercase;font-weight:700}.answer-comparison>div p{overflow-wrap:anywhere;font-family:var(--font-editorial);font-size:var(--text-lg);margin-bottom:0}.answer-comparison>p{padding:var(--space-3) var(--space-6);border-top:var(--border-thin) solid var(--color-line);color:var(--color-ink-muted);font-size:var(--text-sm);grid-column:1/-1;margin:0}.solution-diagnostics{border-top:var(--border-thin) solid var(--color-line);grid-template-columns:repeat(3,1fr);display:grid}.solution-diagnostics section{padding:var(--space-4);border-bottom:var(--border-thin) solid var(--color-line)}.solution-diagnostics section+section{border-left:var(--border-thin) solid var(--color-line)}.solution-diagnostics p{margin-bottom:0}.thinking-pattern{gap:0 var(--space-8);padding:var(--space-6);border-left:.45rem solid var(--color-insight);background:var(--color-insight-soft);color:var(--color-insight-ink);grid-template-columns:minmax(0,2fr) minmax(12rem,1fr);display:grid}.thinking-pattern>span,.thinking-pattern>h3,.thinking-pattern>p{grid-column:1}.thinking-pattern h3{margin:var(--space-1) 0 0;font-family:var(--font-editorial);font-size:var(--text-xl)}.thinking-pattern>p{font-family:var(--font-editorial);font-size:var(--text-lg);margin-bottom:0}.thinking-pattern>div{align-content:center;gap:var(--space-2);padding-left:var(--space-6);border-left:var(--border-thin) solid var(--color-line-strong);grid-area:1/2/span 3;display:grid}.thinking-pattern a{color:var(--color-brand);font-weight:600}.solution-review-note{gap:var(--space-2) var(--space-6);padding-top:var(--space-4);border-top:var(--border-thin) solid var(--color-line);color:var(--color-ink-muted);font-size:var(--text-xs);flex-wrap:wrap;display:flex}.solution-review-note span:first-child{color:var(--color-success);font-weight:700}.key-selection-locked{max-width:42rem;min-height:28rem;padding-top:var(--space-12)}.key-selection-locked>span{color:var(--color-brand);font-size:3rem}.key-selection-locked>p:not(.eyebrow){color:var(--color-ink-muted);font-family:var(--font-editorial);font-size:var(--text-lg)}@media (max-width:64rem){.key-reader{grid-template-columns:1fr;min-width:0}.key-reader__index{min-width:0;max-width:100%;position:static}.key-reader__index ol{grid-template-columns:none;grid-auto-columns:minmax(10rem,72vw);grid-auto-flow:column;width:100%;max-width:100%;overflow-x:auto}}@media (max-width:50rem){.key-access__header,.solution-reader__body{grid-template-columns:1fr}.key-access__header{display:grid}.key-access__trust{padding:var(--space-3) 0 0;border-top:var(--border-thin) solid var(--color-line);border-left:0}.solution-reader__margin{grid-row:1;position:static}.solution-reader__body>.solution-steps{grid-row:2}.solution-diagnostics,.thinking-pattern{grid-template-columns:1fr}.solution-diagnostics section+section{border-left:0}.thinking-pattern>span,.thinking-pattern>h3,.thinking-pattern>p,.thinking-pattern>div{grid-area:auto/1}.thinking-pattern>div{margin-top:var(--space-4);padding:var(--space-4) 0 0;border-top:var(--border-thin) solid var(--color-line-strong);border-left:0}}@media (max-width:32rem){.answer-comparison{grid-template-columns:1fr}.answer-comparison>div+div{border-top:var(--border-thin) solid var(--color-line-strong);border-left:0}.solution-steps li>div{padding-left:0}}@media print{.key-reader,.solution-reader,.key-access{display:none!important}}