:root{color-scheme:light dark;--fg:#1d1d1f;--muted:#6e6e73;--bg:#fff;--accent:#0071e3}
@media (prefers-color-scheme:dark){:root{--fg:#f5f5f7;--muted:#a1a1a6;--bg:#000;--accent:#2997ff}}
body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.6 -apple-system,BlinkMacSystemFont,"Apple SD Gothic Neo",sans-serif}
main{max-width:680px;margin:0 auto;padding:48px 16px}
h1{font-size:32px;line-height:1.2}h2{font-size:21px;margin-top:32px}
p,li{color:var(--fg)}small,.muted{color:var(--muted)}a{color:var(--accent)}
nav{display:flex;gap:16px;font-size:15px;margin-bottom:32px}