/* =========================================================
   COMPONENT: Auth Overlay (Login / Register)
   ========================================================= */

#auth-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
}

#auth-overlay.is-hidden {
  display: none;
}

.auth-card {
  width: 360px;
  max-width: calc(100vw - var(--space-xl));
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-lg);
}

.auth-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: var(--font-size-xl);
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
}
.auth-brand .logo-icon {
  width: 28px;
  height: 28px;
  background: var(--accent-blue);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: 800;
}

.auth-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: var(--space-lg);
}
.auth-tab {
  flex: 1;
  padding: var(--space-sm);
  text-align: center;
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}
.auth-tab:hover {
  color: var(--text-primary);
}
.auth-tab.is-active {
  color: var(--text-primary);
}
.auth-tab.is-active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-blue);
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.auth-submit {
  width: 100%;
  padding: var(--space-md);
  font-weight: 600;
}
.auth-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.auth-error {
  margin-top: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  background: var(--accent-red-dim);
  color: var(--accent-red);
  font-size: var(--font-size-sm);
}

.auth-note {
  margin-top: var(--space-lg);
  text-align: center;
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}