:root{--bg:#F4F7FB;--card:#fff;--ink:#0F172A;--muted:#64748B;--brand:#7C3AED;--line:#E2E8F0}
@media (prefers-color-scheme:dark){:root{--bg:#0B1020;--card:#121A2E;--ink:#E2E8F0;--muted:#94A3B8;--brand:#A78BFA;--line:#1E293B}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif}
main{max-width:720px;margin:0 auto;padding:32px 16px 64px}
.card{background:var(--card);border-radius:20px;padding:28px 24px;box-shadow:0 4px 24px rgba(15,23,42,.06)}
h1{font-size:28px;line-height:1.2;margin:0 0 4px}h2{font-size:18px;margin:28px 0 8px}
p,li{color:var(--ink)}.muted{color:var(--muted);font-size:14px}a{color:var(--brand)}
ul{padding-left:20px}nav{margin-bottom:16px;font-size:14px}nav a{margin-right:12px}
hr{border:0;border-top:1px solid var(--line);margin:40px 0}