:root{--bg:#f7f8fa;--card:#fff;--text:#1f2933;--muted:#5f6b7a;--accent:#1a56db;--line:#e3e7ed}
@media (prefers-color-scheme:dark){:root{--bg:#111418;--card:#1a1f26;--text:#e6e9ee;--muted:#9aa5b4;--accent:#7aa2ff;--line:#2a313b}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
header,footer{max-width:820px;margin:0 auto;padding:24px 16px;display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between;align-items:center}
header strong{font-size:18px}nav a,footer a{color:var(--muted);text-decoration:none;margin-left:16px}nav a:hover,footer a:hover{color:var(--accent)}
main{max-width:820px;margin:0 auto;padding:32px 16px;background:var(--card);border:1px solid var(--line);border-radius:12px}
h1{font-size:30px;line-height:1.25;margin:0 0 8px}h2{font-size:20px;margin:32px 0 8px}p,li{color:var(--text)}.muted{color:var(--muted)}
a{color:var(--accent)}footer{font-size:14px;color:var(--muted)}