:root { --bg: #0f1b2d; --card: #fff; --text: #1c2630; --muted: #5b6b7a; --line: #c9d2db; --brand: #0b5cad; --danger: #b3261e; }
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; display: grid; place-items: center; padding: 16px;
  font: 16px/1.4 system-ui, -apple-system, "Segoe UI", sans-serif; color: var(--text);
  background: linear-gradient(135deg, #0f1b2d, #0b5cad);
}
.card { width: 100%; max-width: 380px; background: var(--card); border-radius: 12px; padding: 32px 28px; box-shadow: 0 10px 40px rgba(0,0,0,.35); }
.logo { width: 48px; height: 48px; border-radius: 12px; background: var(--brand); color: #fff; font-weight: 700; font-size: 26px; display: grid; place-items: center; margin: 0 auto 12px; }
h1 { margin: 0; text-align: center; font-size: 24px; }
.sub { margin: 4px 0 24px; text-align: center; color: var(--muted); font-size: 14px; }
label { display: block; margin: 14px 0 6px; font-size: 14px; font-weight: 600; }
input { width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; font: inherit; }
input:focus { outline: 2px solid var(--brand); border-color: transparent; }
#code { letter-spacing: .4em; text-align: center; font-size: 20px; }
button { width: 100%; margin-top: 22px; padding: 11px; border: 0; border-radius: 8px; background: var(--brand); color: #fff; font: inherit; font-weight: 600; cursor: pointer; }
button:disabled { opacity: .6; cursor: wait; }
.error { margin: 14px 0 0; color: var(--danger); font-size: 14px; }
[hidden] { display: none !important; }