:root{--bg:#f6f7f9;--card:#fff;--fg:#1c1e21;--muted:#5f6670;--accent:#3a6df0;--line:#e3e6ea}
@media (prefers-color-scheme:dark){:root{--bg:#121417;--card:#1b1e22;--fg:#e8eaed;--muted:#9aa1ab;--accent:#7aa2ff;--line:#2b2f35}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif}
main{max-width:720px;margin:0 auto;padding:40px 16px 64px}
header{display:flex;align-items:center;gap:14px;margin-bottom:8px}
header img{width:56px;height:56px;border-radius:13px}
h1{font-size:28px;line-height:1.2;margin:0}
h2{font-size:20px;margin:32px 0 8px}
h3{font-size:16px;margin:20px 0 4px}
p,li{color:var(--fg)}
.muted{color:var(--muted);font-size:14px}
a{color:var(--accent)}
section{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:4px 22px 18px;margin-top:20px}
nav{font-size:14px;margin-top:6px}
ol li,ul li{margin:4px 0}
footer{margin-top:32px;font-size:13px;color:var(--muted)}