:root{color-scheme:light;--ink:#171918;--paper:#f3f0e7;--muted:#545850;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:24px}
body{margin:0}
a{color:inherit;text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:5px}
a:focus-visible{outline:3px solid currentColor;outline-offset:6px}
.skip{position:fixed;top:-100px;left:20px;z-index:10;background:var(--paper);padding:15px}
.skip:focus{top:15px}
.top{padding:28px 5%;display:flex;align-items:center;justify-content:space-between;gap:24px;border-bottom:1px solid #17191830}
.brand{font-size:19px;font-weight:800;letter-spacing:-.7px;line-height:1;position:relative;white-space:nowrap}
.brand-dot{position:static;margin-left:8px;font-size:1em;color:#4a5be2;vertical-align:baseline}
.top nav{display:flex;align-items:center;gap:22px;font-size:14px;line-height:1}
.top nav a{display:inline-flex;align-items:center;min-height:32px;white-space:nowrap}
.hero{background:var(--ink);color:var(--paper);padding:34px 5% 70px;overflow:hidden}
.hero-top{display:flex;justify-content:space-between;gap:20px;font:11px monospace;letter-spacing:1px;color:#c8ccc5}
.hero h1{position:relative;max-width:1250px;margin:65px 0 58px;font-size:clamp(68px,11.5vw,172px);line-height:.92;letter-spacing:-.075em;font-weight:600}
.hero em{font-style:normal;color:#d4ed98}
.asterisk{position:absolute;right:3%;top:5px;color:#d4ed98;font-size:1.5em;font-weight:400;line-height:.8;transform:rotate(12deg)}
.hero-bottom{display:grid;grid-template-columns:1fr 1fr;gap:10%;max-width:1160px}
.hero-bottom>p{font-size:clamp(22px,2.3vw,32px);line-height:1.3;letter-spacing:-.025em;margin:0}
.hero-bottom div>p{font-size:17px;line-height:1.65;max-width:430px;margin:0 0 26px;color:#ced0c9}
.button{display:inline-flex;justify-content:space-between;gap:42px;padding:15px 20px;border:1px solid currentColor;font-size:14px}
.button:hover{background:#d4ed98;color:var(--ink);border-color:#d4ed98;text-decoration:none}
.label{font:11px monospace;letter-spacing:1.4px}
.chapter-nav{display:grid;grid-template-columns:repeat(4,1fr);border-block:1px solid #17191840}
.chapter-nav a{display:flex;justify-content:space-between;gap:12px;padding:24px 22px;font-size:14px;border-right:1px solid #17191840}
.chapter-nav a:last-child{border-right:0}
.chapter-nav a:hover{background:#e3e5d9;text-decoration:none}
.chapter-nav a span:first-child{font:11px monospace;color:var(--muted)}
.chapter{padding:80px 5%}
.define{background:#d8def6}
.prove{background:#d4ed98}
.explain{background:#f3f0e7}
.propose{background:#e9e4f8}
.chapter-heading{display:grid;grid-template-columns:1.4fr 1fr;gap:10%;align-items:end;margin-bottom:55px}
.chapter h2,.practice h2{font-size:clamp(42px,5.5vw,80px);line-height:1.02;letter-spacing:-.055em;font-weight:500;margin:22px 0 0}
.chapter-heading>p{font-size:18px;line-height:1.55;max-width:440px;margin:0}
.articles{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0 38px}
.article{border-top:1px solid #17191855;padding:25px 0 32px;display:flex;flex-direction:column;align-items:start}
.article-number{font:10px monospace;letter-spacing:1.1px}
.article h3{font-size:24px;line-height:1.22;letter-spacing:-.7px;margin:24px 0 16px;font-weight:600}
.article p{font-size:15px;line-height:1.65;margin:0 0 24px}
.read{margin-top:auto;font-size:13px;font-weight:600;display:flex;justify-content:space-between;width:100%;gap:20px}
.article--planned{border-top-style:dashed}
.article-status{margin-top:auto;padding-top:18px;font:10px monospace;letter-spacing:1px;text-transform:uppercase;color:var(--muted)}
.practice{position:relative;isolation:isolate;overflow:hidden;min-height:580px;background:#090b0d;color:#f3f0e7;padding:80px 5%;display:flex;align-items:center}
.practice-copy{z-index:1;position:relative}
.practice p{font-size:18px;line-height:1.7;margin:24px 0 30px;color:#c8ccc5}
.practice img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:65% center;z-index:-2}
.practice::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,#090b0d 5%,#090b0d99 16%,transparent 42%);z-index:-1}
footer{padding:32px 5%;display:flex;align-items:center;justify-content:space-between;gap:24px}
footer p,footer>a:last-child{font-size:12px}
footer p{color:var(--muted)}
@media(min-width:1600px){.hero,.chapter,.practice{padding-left:max(5%,calc((100% - 1440px)/2));padding-right:max(5%,calc((100% - 1440px)/2))}
}
@media(max-width:900px){.asterisk{font-size:1em;right:0}
.hero h1{font-size:12vw}
.articles{grid-template-columns:repeat(2,minmax(0,1fr))}
.chapter-nav a{font-size:12px;padding:20px 12px}
.chapter-heading{gap:35px}
.chapter-heading>p{font-size:16px}
}
@media(max-width:600px){.top{align-items:start;padding-block:22px;gap:10px}
.brand{font-size:16px}
.brand-dot{display:none}
.top nav{gap:14px;flex-wrap:wrap;justify-content:end;max-width:190px;font-size:12px}
.hero{padding-top:25px;padding-bottom:42px}
.hero-top{font-size:9px;flex-direction:column;gap:10px}
.hero h1{font-size:clamp(54px,13vw,78px);margin:44px 0 35px}
.asterisk{display:none}
.hero-bottom{grid-template-columns:1fr;gap:22px}
.hero-bottom div>p{font-size:15px}
.chapter-nav{grid-template-columns:1fr}
.chapter-nav a{border-right:0;border-bottom:1px solid #17191830;font-size:13px;padding:18px 5%}
.chapter-nav a:last-child{border-bottom:0}
.chapter{padding-block:48px}
.chapter-heading{grid-template-columns:1fr;gap:24px;margin-bottom:35px}
.articles{grid-template-columns:1fr}
.article h3{font-size:25px}
.practice{min-height:600px;align-items:start;padding-block:50px}
.practice img{object-fit:contain;object-position:center bottom;opacity:.8}
.practice::after{background:linear-gradient(#090b0d 8%,#090b0d80 28%,transparent 58%)}
footer{align-items:start;flex-direction:column;gap:14px}
footer p{margin:0}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}
}