:root{font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color-scheme:light dark}body{margin:0;min-height:100vh;display:grid;place-items:center;background:#f6f7f9}@media(prefers-color-scheme:dark){body{background:#16181d;color:#e6e6e6}}#root{width:100%;max-width:420px;padding:24px}.card{text-align:center;padding:32px;border-radius:12px;background:#7f7f7f0f}