:root{color-scheme:light dark;font-family:system-ui,-apple-system,sans-serif}body{margin:0;display:flex;min-height:100vh;align-items:center;justify-content:center;background:#f6f6f7}.card{width:min(420px,92vw);padding:32px;background:#fff;border-radius:12px;box-shadow:0 1px 3px #0000001a}.card h1{margin:0 0 16px;font-size:20px}@media(prefers-color-scheme:dark){body{background:#111}.card{background:#1b1b1b;box-shadow:none;border:1px solid #2a2a2a}}