:root { --bg:#f5f5f7; --card:#fff; --ink:#1d1d1f; --muted:#6e6e73; --accent:#4f46e5; --line:#e5e5ea; }
@media (prefers-color-scheme: dark) { :root { --bg:#000; --card:#1c1c1e; --ink:#f5f5f7; --muted:#a1a1a6; --accent:#8b85ff; --line:#2c2c2e; } }
* { box-sizing: border-box; }
body { margin:0; background:var(--bg); color:var(--ink); font:17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif; -webkit-text-size-adjust:100%; }
main { max-width:720px; margin:0 auto; padding:40px 16px 64px; }
header { display:flex; align-items:center; gap:12px; margin-bottom:28px; }
.logo { width:44px; height:44px; border-radius:11px; background:linear-gradient(135deg,var(--accent),#7c3aed); display:grid; place-items:center; color:#fff; font-size:22px; }
h1 { font-size:30px; line-height:1.2; margin:0; }
h2 { font-size:21px; margin:32px 0 8px; }
h3 { font-size:17px; margin:20px 0 4px; }
p, li { color:var(--ink); }
.muted { color:var(--muted); font-size:15px; }
.card { background:var(--card); border-radius:16px; padding:20px; margin:16px 0; border:1px solid var(--line); }
a { color:var(--accent); text-decoration:none; } a:hover { text-decoration:underline; }
details { background:var(--card); border:1px solid var(--line); border-radius:14px; padding:14px 18px; margin:10px 0; }
summary { font-weight:600; cursor:pointer; }
nav { display:flex; gap:18px; margin-top:40px; font-size:15px; flex-wrap:wrap; }
ul { padding-left:22px; }