body{margin:0;min-height:100vh;display:grid;place-items:center;background:#f6f7f9;color:#14181f;font:16px/1.5 system-ui,-apple-system,"Segoe UI",sans-serif}
main{max-width:420px;margin:16px;padding:32px;background:#fff;border:1px solid #dfe3ea;border-radius:12px}
h1{font-size:22px;margin:0 0 8px}p{margin:0 0 20px;color:#4a5363}.error{color:#b42318}
button{font:inherit;font-weight:600;padding:10px 18px;border-radius:8px;border:0;background:#14181f;color:#fff;cursor:pointer}
button:disabled{opacity:.6;cursor:wait}
@media (prefers-color-scheme:dark){body{background:#0f1217;color:#e7eaf0}main{background:#171b22;border-color:#2a303b}p{color:#a8b0bf}button{background:#e7eaf0;color:#0f1217}}