:root{color-scheme:light dark;--fg:#1d1d1f;--muted:#6e6e73;--bg:#fff;--accent:#b11f4b}
@media (prefers-color-scheme:dark){:root{--fg:#f5f5f7;--muted:#a1a1a6;--bg:#000;--accent:#fd8ea1}}
body{margin:0;font:17px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--fg)}
main{max-width:720px;margin:0 auto;padding:48px 24px}
h1{font-size:34px;line-height:1.2}h2{font-size:22px;margin-top:32px}
a{color:var(--accent)}.muted{color:var(--muted)}nav a{margin-right:16px}