* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; background: #0a0e27; }
body {
  font-family: Inter, system-ui, -apple-system, "Segoe UI", sans-serif;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 16px;
}
.card {
  width: 100%;
  max-width: 380px;
  background: #161b40;
  border: 1px solid #2a3170;
  border-radius: 16px;
  padding: 32px 28px;
  box-shadow: 0 0 40px -10px rgba(168, 85, 247, .45);
}
h1 { font-size: 20px; line-height: 1.3; margin: 0 0 4px; }
.sub { margin: 0 0 24px; color: #94a3b8; font-size: 14px; }
label { display: block; font-size: 13px; font-weight: 600; color: #cbd5e1; margin: 16px 0 6px; }
input {
  width: 100%;
  padding: 10px 12px;
  font-size: 15px;
  color: #fff;
  background: #10163a;
  border: 1px solid #2a3170;
  border-radius: 8px;
  outline: none;
}
input:focus { border-color: #a855f7; box-shadow: 0 0 0 3px rgba(168, 85, 247, .25); }
#totp { letter-spacing: 4px; font-variant-numeric: tabular-nums; }
button {
  width: 100%;
  margin-top: 24px;
  padding: 11px 12px;
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(90deg, #a855f7, #ec4899);
  border: 0;
  border-radius: 8px;
  cursor: pointer;
}
button:disabled { opacity: .6; cursor: wait; }
.error {
  margin-bottom: 8px;
  padding: 10px 12px;
  font-size: 14px;
  color: #fecaca;
  background: rgba(239, 68, 68, .12);
  border: 1px solid rgba(239, 68, 68, .4);
  border-radius: 8px;
}