:root{color-scheme:light dark;--fg:#1d1d1f;--bg:#fff;--muted:#555}
@media (prefers-color-scheme:dark){:root{--fg:#eee;--bg:#161618;--muted:#aaa}}
body{background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,sans-serif;max-width:42rem;margin:0 auto;padding:2rem 16px}
h1{font-size:1.6rem;margin-bottom:.25rem}p.sub,footer{color:var(--muted)}a{color:inherit}