body.auth-body {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: radial-gradient(120% 90% at 50% -10%, var(--color-surface-2), var(--color-surface-1));
  padding: var(--space-3);
}

.auth-card {
  width: 100%;
  max-width: 26rem;
  padding: var(--space-6) var(--space-4);
  border-radius: var(--radius-lg);
}

.auth-brand {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--color-text-primary);
  display: block;
  text-align: center;
  margin-bottom: var(--space-4);
}
.auth-brand span {
  color: var(--color-accent);
}

.auth-title {
  font-size: var(--type-heading-lg);
  text-align: center;
  margin-bottom: var(--space-1);
}
.auth-subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  font-size: var(--type-body-sm);
  margin-bottom: var(--space-4);
}

.field-group {
  margin-bottom: var(--space-3);
}
.field-label {
  display: block;
  font-size: var(--type-body-sm);
  font-weight: 500;
  margin-bottom: 0.4rem;
  color: var(--color-text-primary);
}
.field-input {
  width: 100%;
  padding: 0.8rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface-1);
  color: var(--color-text-primary);
  font-size: var(--type-body);
  font-family: inherit;
  transition: border-color var(--duration-fast) ease;
}
.field-input:focus {
  outline: none;
  border-color: var(--color-accent);
}
.field-input.field-invalid {
  border-color: var(--color-error);
}
.field-error {
  display: none;
  color: var(--color-error);
  font-size: var(--type-caption);
  margin-top: 0.35rem;
}
.field-error.visible {
  display: block;
}

.role-toggle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}
.role-option {
  padding: 0.9rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface-1);
  color: var(--color-text-secondary);
  text-align: center;
  cursor: pointer;
  font-size: var(--type-body-sm);
  font-weight: 500;
  transition: all var(--duration-fast) ease;
}
.role-option.active {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-wash);
}

.auth-submit {
  width: 100%;
  margin-top: var(--space-2);
}

.auth-footer {
  text-align: center;
  margin-top: var(--space-3);
  font-size: var(--type-body-sm);
  color: var(--color-text-secondary);
}
.auth-footer a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
}

.auth-banner {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: var(--type-body-sm);
  margin-bottom: var(--space-3);
  display: none;
}
.auth-banner.visible {
  display: block;
}
.auth-banner-error {
  background: color-mix(in oklch, var(--color-error) 14%, transparent);
  color: var(--color-error);
}
.auth-banner-success {
  background: color-mix(in oklch, var(--color-success) 14%, transparent);
  color: var(--color-success);
}

.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  vertical-align: -3px;
  margin-right: 0.4rem;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}
@media (prefers-reduced-motion: reduce) {
  .spinner {
    animation: none;
  }
}