:root{--bg:#fff;--fg:#1a1a1a;--muted:#5b5b5b;--line:#e6e6e6;--accent:#2563eb}
@media (prefers-color-scheme:dark){:root{--bg:#111;--fg:#eee;--muted:#a3a3a3;--line:#2a2a2a;--accent:#60a5fa}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,-apple-system,Segoe UI,Roboto,sans-serif}
main{max-width:720px;margin:0 auto;padding:48px 16px}h1{font-size:2rem;margin:0 0 .5rem}h2{font-size:1.15rem;margin-top:2rem}
p,li{color:var(--fg)}.muted{color:var(--muted)}a{color:var(--accent)}nav{display:flex;gap:16px;flex-wrap:wrap;border-top:1px solid var(--line);margin-top:48px;padding-top:16px;font-size:.9rem}
.btn{display:inline-block;margin-top:16px;padding:10px 18px;border-radius:8px;background:var(--accent);color:#fff;text-decoration:none}