:root{color-scheme:light dark;--fg:#1c1c1e;--bg:#ffffff;--muted:#6e6e73;--accent:#0a66c2;--card:#f5f5f7}
@media (prefers-color-scheme:dark){:root{--fg:#f2f2f7;--bg:#111114;--muted:#a1a1a6;--accent:#6ab0ff;--card:#1c1c21}}
*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--fg);background:var(--bg);line-height:1.55}
main{max-width:720px;margin:0 auto;padding:48px 24px 64px}header{display:flex;align-items:center;justify-content:space-between;margin-bottom:40px}
header a{color:var(--fg);text-decoration:none;font-weight:600}nav a{margin-left:20px;color:var(--muted);font-weight:500}
h1{font-size:2rem;margin:0 0 8px}h2{font-size:1.2rem;margin:32px 0 8px}p,li{color:var(--fg)}.muted{color:var(--muted)}
.card{background:var(--card);border-radius:14px;padding:20px 24px;margin:20px 0}footer{margin-top:48px;color:var(--muted);font-size:.9rem}
footer a{color:var(--muted)}