*{box-sizing:border-box}
body{margin:0;min-height:100vh;display:grid;place-items:center;font-family:'Segoe UI',system-ui,-apple-system,Roboto,Arial,sans-serif;
  background:radial-gradient(900px 520px at 100% -8%,rgba(200,155,60,.18),transparent 60%),linear-gradient(160deg,#0c1524,#15223a);color:#0f172a;padding:16px}
.box{width:min(400px,100%);background:#fff;border-radius:16px;padding:28px 26px;box-shadow:0 20px 60px rgba(0,0,0,.35)}
.brand{display:flex;gap:12px;align-items:center;margin-bottom:22px}
.mark{width:46px;height:46px;border-radius:12px;background:linear-gradient(135deg,#123a6b,#c89b3c);display:grid;place-items:center;color:#fff;font-weight:800;font-family:Georgia,serif;flex:none}
.brand strong{display:block;font-family:Georgia,serif;font-size:18px}
.brand span{font-size:11px;color:#64748b;text-transform:uppercase;letter-spacing:.8px}
form{display:flex;flex-direction:column;gap:14px}
label{display:flex;flex-direction:column;gap:5px;font-size:12px;font-weight:700;color:#475569;text-transform:uppercase;letter-spacing:.4px}
input{padding:11px 12px;border:1px solid #cbd5e1;border-radius:10px;font-size:15px;font-family:inherit}
input:focus{outline:none;border-color:#1d5fb8;box-shadow:0 0 0 3px rgba(29,95,184,.15)}
button{margin-top:4px;padding:12px;border:none;border-radius:10px;background:#16456b;color:#fff;font-size:15px;font-weight:700;cursor:pointer}
button:hover{background:#0f2f4a}
.erro{background:#fee2e2;color:#b91c1c;border-radius:9px;padding:9px 11px;font-size:13px;font-weight:600}
.demo{margin:18px 0 0;text-align:center;font-size:12px;color:#94a3b8}