.auth-gate {
  position: fixed;
  inset: 0;
  z-index: 900;
  display: grid;
  place-items: center;
  padding: 24px;
  background: #eef3f8;
}

.auth-gate[hidden] { display: none; }

.auth-card {
  display: grid;
  gap: 14px;
  width: min(420px, 100%);
  padding: 28px;
  border: 1px solid #cbd8e5;
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 18px 50px rgba(22, 43, 64, .18);
}

.auth-card h2, .auth-card p { margin: 0; }
.auth-card label { display: grid; gap: 6px; }
.auth-card output { min-height: 1.3em; color: #b42318; }