/* ==============================================================================
   🌐 FrankBase Universal Auth & SSO CSS Framework (WCAG 2.1 AA Dual Theme)
   ============================================================================== */

:root {
  --fb-modal-bg: #ffffff;
  --fb-modal-text: #0f172a;
  --fb-modal-sub: #64748b;
  --fb-modal-border: #e2e8f0;
  --fb-modal-shadow: rgba(0, 0, 0, 0.15);
  --fb-modal-primary: #4f46e5;
  --fb-modal-backdrop: rgba(15, 23, 42, 0.65);
}

[data-theme="dark"], body.dark, .dark {
  --fb-modal-bg: #0f172a;
  --fb-modal-text: #f8fafc;
  --fb-modal-sub: #94a3b8;
  --fb-modal-border: #334155;
  --fb-modal-shadow: rgba(0, 0, 0, 0.45);
  --fb-modal-primary: #6366f1;
  --fb-modal-backdrop: rgba(0, 0, 0, 0.8);
}

.fb-auth-modal-backdrop {
  position: fixed;
  inset: 0;
  background: var(--fb-modal-backdrop);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 99999;
  padding: 1rem;
  animation: fbFadeIn 0.2s ease-out forwards;
}

.fb-auth-modal-backdrop.active {
  display: flex;
}

.fb-auth-modal-card {
  position: relative;
  background: var(--fb-modal-bg);
  border: 1px solid var(--fb-modal-border);
  border-radius: 1.5rem;
  max-width: 420px;
  width: 100%;
  padding: 2.25rem 1.75rem;
  text-align: center;
  box-shadow: 0 20px 25px -5px var(--fb-modal-shadow), 0 8px 10px -6px var(--fb-modal-shadow);
  color: var(--fb-modal-text);
  font-family: inherit;
}

.fb-auth-close-btn {
  position: absolute;
  top: 1rem;
  right: 1.25rem;
  background: transparent;
  border: none;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--fb-modal-sub);
  cursor: pointer;
  padding: 0.25rem;
  border-radius: 50%;
  transition: all 0.2s;
}

.fb-auth-close-btn:hover {
  color: var(--fb-modal-text);
  background: var(--fb-modal-border);
}

.fb-auth-brand-badge {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
}

.fb-auth-modal-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 0 0 0.5rem 0;
  color: var(--fb-modal-text);
}

.fb-auth-modal-sub {
  font-size: 0.88rem;
  line-height: 1.5;
  color: var(--fb-modal-sub);
  margin: 0 0 1.75rem 0;
}

.fb-gsi-slot {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 48px;
  margin-bottom: 1.5rem;
}

.fb-auth-modal-footer {
  font-size: 0.75rem;
  color: var(--fb-modal-sub);
  padding-top: 1rem;
  border-top: 1px solid var(--fb-modal-border);
}

@keyframes fbFadeIn {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: scale(1); }
}