*{box-sizing:border-box}body{color:#e2e8f0;background:#0f172a;margin:0;font-family:Arial,Helvetica,sans-serif}.center{place-items:center;min-height:100vh;padding:16px;display:grid}.card{background:#111827;border:1px solid #334155;border-radius:12px;width:100%;max-width:420px;padding:20px}.title{margin:0 0 16px;font-size:22px}.field{flex-direction:column;gap:6px;margin-bottom:12px;display:flex}.card input{color:#e2e8f0;background:#0b1220;border:1px solid #475569;border-radius:8px;padding:10px 12px}.card button{color:#fff;cursor:pointer;background:#2563eb;border:0;border-radius:8px;width:100%;padding:10px 12px}.error{color:#fca5a5;margin:8px 0}.ok{color:#86efac;margin:8px 0}