/* ── Auth gate ── */
.auth-gate {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.auth-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 2.5rem;
  width: 100%;
  max-width: 360px;
  text-align: center;
}

.auth-logo {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 1.75rem;
}

.auth-input {
  width: 100%;
  padding: 0.65rem 0.9rem;
  font-family: var(--font);
  font-size: 0.95rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--t-fast);
  background: var(--color-bg);
  color: var(--color-text);
}

.auth-input:focus {
  border-color: var(--color-accent);
}

.auth-input.error {
  border-color: #ef4444;
  animation: shake 0.35s ease;
}

.auth-submit {
  width: 100%;
  margin-top: 0.85rem;
}

.auth-error {
  font-size: 0.82rem;
  color: #ef4444;
  margin-top: 0.6rem;
  min-height: 1.2em;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}