:root{--bg:#fff;--fg:#111;--muted:#555}@media (prefers-color-scheme:dark){:root{--bg:#111;--fg:#f2f2f2;--muted:#a0a0a0}}body{background:var(--bg);color:var(--fg);margin:0;font-family:system-ui,sans-serif}main{max-width:40rem;margin:0 auto;padding:4rem 1rem}p{color:var(--muted)}a{color:inherit}