:root{--bg:#0f1115;--card:#171a21;--text:#e8eaf0;--muted:#9aa3b2;--accent:#e0443e;--line:#262b36}
@media (prefers-color-scheme:light){:root{--bg:#f6f7f9;--card:#fff;--text:#1a1d24;--muted:#5b6473;--line:#e1e4ea}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font:17px/1.65 system-ui,-apple-system,Segoe UI,Roboto,sans-serif}
main{max-width:720px;margin:0 auto;padding:48px 20px 72px}
h1{font-size:2rem;margin:0 0 .25rem}
h2{font-size:1.15rem;margin:2rem 0 .4rem}
p,li{color:var(--text)}
.sub{color:var(--muted);margin:0 0 2rem}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px 22px;margin:1.2rem 0}
a{color:var(--accent)}
nav{margin:0 0 2rem;display:flex;gap:18px}
footer{margin-top:3rem;color:var(--muted);font-size:.9rem}