:root{color-scheme:light dark;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}body{margin:0;min-height:100vh;display:grid;place-items:center;background:#0e0f13;color:#e8e8ea}.card{width:min(92vw,22rem);padding:2rem;border-radius:16px;background:#17181f;box-shadow:0 12px 40px #00000059;text-align:center}.card h1{margin:0 0 .5rem;font-size:1.75rem;letter-spacing:.02em}.card p{margin:0 0 1.5rem}.muted{color:#9a9aa6}.error{color:#ff8080}.card button{cursor:pointer;padding:.7rem 1.4rem;border:0;border-radius:10px;font-size:1rem;color:#fff;background:#6a49f2}.card button:hover{background:#5a3fd6}