/* ============================================
   Modal System — Auth & Payment
   ============================================ */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(11, 31, 51, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  padding: var(--fb-space-4);
}

.modal-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--fb-white);
  border-radius: var(--fb-radius-xl);
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(20px) scale(0.96);
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.modal-overlay.is-open .modal {
  transform: translateY(0) scale(1);
}

.modal__header {
  padding: var(--fb-space-6) var(--fb-space-6) 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal__title {
  font-size: var(--fb-text-xl);
  font-weight: var(--fb-weight-bold);
  color: var(--fb-gray-900);
}

.modal__close {
  width: 36px;
  height: 36px;
  border-radius: var(--fb-radius-full);
  border: none;
  background: var(--fb-gray-100);
  color: var(--fb-gray-500);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.modal__close:hover {
  background: var(--fb-gray-200);
  color: var(--fb-gray-900);
}

.modal__body {
  padding: var(--fb-space-5) var(--fb-space-6);
}

.modal__footer {
  padding: 0 var(--fb-space-6) var(--fb-space-6);
  text-align: center;
}

/* OAuth buttons */
.oauth-grid {
  display: grid;
  gap: var(--fb-space-3);
  margin-bottom: var(--fb-space-5);
}

.oauth-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--fb-space-3);
  padding: var(--fb-space-3) var(--fb-space-4);
  border-radius: var(--fb-radius-md);
  border: 1px solid var(--fb-gray-200);
  background: var(--fb-white);
  color: var(--fb-gray-900);
  font-weight: var(--fb-weight-medium);
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}

.oauth-btn:hover {
  background: var(--fb-gray-50);
  border-color: var(--fb-gray-300);
}

.oauth-btn--vk { border-left: 3px solid #0077FF; }
.oauth-btn--google { border-left: 3px solid #EA4335; }
.oauth-btn--yandex { border-left: 3px solid #FC3F1D; }

.oauth-btn svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

/* Divider */
.modal-divider {
  display: flex;
  align-items: center;
  gap: var(--fb-space-3);
  margin: var(--fb-space-5) 0;
  color: var(--fb-gray-400);
  font-size: var(--fb-text-sm);
}

.modal-divider::before,
.modal-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--fb-gray-100);
}

/* Payment modal specific */
.modal--payment {
  max-width: 560px;
}

.paywall-modal__inner {
  display: grid;
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .paywall-modal__inner {
    grid-template-columns: 1.2fr 1fr;
  }
}

.paywall-modal__content {
  padding: var(--fb-space-6);
}

.paywall-modal__visual {
  background: var(--fb-blue-50);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--fb-space-6);
  min-height: 200px;
}

.paywall-modal__price {
  display: flex;
  align-items: baseline;
  gap: var(--fb-space-3);
  margin: var(--fb-space-4) 0;
}

.paywall-modal__amount {
  font-size: var(--fb-text-3xl);
  font-weight: var(--fb-weight-bold);
  color: var(--fb-gray-900);
  font-family: var(--fb-font-mono);
}

.paywall-modal__original {
  font-size: var(--fb-text-base);
  color: var(--fb-gray-400);
  text-decoration: line-through;
}

.paywall-modal__discount {
  background: var(--fb-green-500);
  color: white;
  font-size: var(--fb-text-xs);
  font-weight: var(--fb-weight-bold);
  padding: 2px 8px;
  border-radius: var(--fb-radius-full);
}

/* Security badge */
.security-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--fb-space-2);
  padding: var(--fb-space-3);
  background: var(--fb-green-50);
  border-radius: var(--fb-radius-md);
  font-size: var(--fb-text-sm);
  color: var(--fb-green-500);
  margin-top: var(--fb-space-4);
}

/* Form errors in modal */
.modal-error {
  background: var(--fb-red-50);
  color: var(--fb-red-500);
  padding: var(--fb-space-3) var(--fb-space-4);
  border-radius: var(--fb-radius-md);
  font-size: var(--fb-text-sm);
  margin-bottom: var(--fb-space-4);
  display: none;
}

.modal-error.is-visible { display: block; }

/* Animations */
@keyframes modalPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.02); }
}

.modal.is-pulsing {
  animation: modalPulse 0.3s ease;
}

/* Responsive */
@media (max-width: 480px) {
  .modal { border-radius: var(--fb-radius-lg); }
  .modal__body { padding: var(--fb-space-4); }
  .modal__header { padding: var(--fb-space-4) var(--fb-space-4) 0; }
}

/* Payment pending loader */
.payment-loader {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--fb-brand-gradient);
  animation: payment-pulse 1.5s ease-in-out infinite;
  margin: 0 auto;
}
@keyframes payment-pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(0.85); opacity: 0.7; }
}