:root{--ink:#1d1d1f;--muted:#6e6e73;--accent:#c62828;--bg:#ffffff;--card:#f5f5f7}
@media (prefers-color-scheme:dark){:root{--ink:#f5f5f7;--muted:#a1a1a6;--bg:#000;--card:#1c1c1e}}
*{box-sizing:border-box}body{margin:0;font:17px/1.6 -apple-system,BlinkMacSystemFont,"Hiragino Sans","Segoe UI",sans-serif;color:var(--ink);background:var(--bg)}
main{max-width:720px;margin:0 auto;padding:32px 16px 64px}header a{color:var(--accent);font-weight:700;text-decoration:none;font-size:20px}
h1{font-size:32px;line-height:1.2;margin:24px 0 8px}h2{font-size:21px;margin:32px 0 8px}p,li{color:var(--ink)}.muted{color:var(--muted)}
a{color:var(--accent)}.card{background:var(--card);border-radius:14px;padding:16px 18px;margin:16px 0}nav a{margin-right:16px}footer{margin-top:48px;color:var(--muted);font-size:14px}