:root{--bg:#fff;--fg:#1a1a1a;--muted:#5c5c5c;--line:#e4e4e4}
@media (prefers-color-scheme:dark){:root{--bg:#121212;--fg:#ececec;--muted:#a8a8a8;--line:#2c2c2c}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,-apple-system,Segoe UI,sans-serif}
main{max-width:720px;margin:0 auto;padding:40px 16px 64px}
header nav{display:flex;gap:20px;flex-wrap:wrap;margin-bottom:32px}
a{color:inherit}h1{font-size:1.8rem;line-height:1.25;margin:0 0 8px}h2{font-size:1.15rem;margin:32px 0 8px}
.muted{color:var(--muted)}footer{border-top:1px solid var(--line);margin-top:48px;padding-top:16px;font-size:.9rem;color:var(--muted)}