:root{color-scheme:dark;--bg:#05060a;--panel:#0c0d15;--line:#292b39;--fg:#f1f3fa;--muted:#abb2c3;--lime:#c8ff2e;--purple:#7b61ff;font-family:Inter,system-ui,sans-serif;background:var(--bg);color:var(--fg);line-height:1.65}*{box-sizing:border-box}body{margin:0;background:radial-gradient(circle at 85% 10%,rgba(123,97,255,.16),transparent 30%),var(--bg)}a{color:var(--lime);text-underline-offset:4px}.wrap{width:min(920px,calc(100% - 36px));margin:auto}.top{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:22px 0;border-bottom:1px solid var(--line)}.brand{color:var(--fg);font:700 19px/1 Space Grotesk,system-ui;text-decoration:none}.brand b{color:var(--lime)}.top nav{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:8px 18px}.top nav a{color:var(--muted);font-size:13px;text-decoration:none}.top nav a:hover{color:var(--lime)}main{padding:70px 0}.eyebrow{color:var(--lime);font-size:12px;font-weight:700;letter-spacing:.14em;text-transform:uppercase}.hero h1{max-width:820px;margin:14px 0 20px;font:700 clamp(40px,8vw,72px)/.98 Space Grotesk,system-ui;letter-spacing:-.055em}.hero .lead{max-width:720px;color:#c6ccda;font-size:18px}.cta{display:inline-flex;margin-top:24px;padding:14px 21px;border-radius:999px;background:var(--lime);color:#080a0e;font-weight:800;text-decoration:none;box-shadow:4px 4px 0 var(--purple)}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin:50px 0}.card,section{padding:28px;border:1px solid var(--line);border-radius:20px;background:rgba(12,13,21,.92)}h2{margin:0 0 14px;font:650 clamp(26px,4vw,36px)/1.1 Space Grotesk,system-ui;letter-spacing:-.035em}h3{margin:0 0 8px;font:650 20px/1.2 Space Grotesk,system-ui}p,li{color:var(--muted)}section{margin-top:18px}section ul{padding-left:20px}.formula{overflow:auto;padding:15px;border-radius:12px;background:#181a29;color:#e8eaf2;font:13px/1.6 ui-monospace,monospace}.note{border-left:3px solid var(--lime);padding-left:16px}.sources{font-size:13px}.foot{display:flex;justify-content:space-between;gap:16px;padding:28px 0 40px;border-top:1px solid var(--line);color:var(--muted);font-size:13px}.foot nav{display:flex;flex-wrap:wrap;gap:8px 16px}.foot a{color:var(--muted)}@media(max-width:650px){main{padding:46px 0}.top{align-items:flex-start}.top nav{gap:6px 12px}.grid{grid-template-columns:1fr;margin:36px 0}.card,section{padding:22px}.foot{flex-direction:column}}