:root{color-scheme:light dark;--bg:#fff;--fg:#1a1a1a;--muted:#555;--link:#0b57d0;--line:#ddd}
@media (prefers-color-scheme:dark){:root{--bg:#121212;--fg:#eee;--muted:#aaa;--link:#8ab4f8;--line:#333}}
body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
main{max-width:720px;margin:0 auto;padding:32px 20px 64px}
header nav{max-width:720px;margin:0 auto;padding:16px 20px;border-bottom:1px solid var(--line);display:flex;gap:20px;flex-wrap:wrap}
a{color:var(--link)} h1{font-size:2rem;line-height:1.2;margin:0 0 .5em} h2{font-size:1.25rem;margin:1.8em 0 .4em}
.muted{color:var(--muted)} footer{max-width:720px;margin:0 auto;padding:20px;border-top:1px solid var(--line);color:var(--muted);font-size:.9rem}