/* =============================================================================
   Skeleton Loading Component
   TASK-053: Skeleton loading styles
   ============================================================================= */

.billing-skeleton {
  animation: billing-skeleton-fade 1s ease-in-out infinite;
}

@keyframes billing-skeleton-fade {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.billing-skeleton__card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-md);
}

.billing-skeleton__card--lg {
  min-height: 120px;
}

.billing-skeleton__line {
  background: var(--border-default);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-sm);
}

.billing-skeleton__line--xs {
  height: 12px;
}

.billing-skeleton__line--sm {
  height: 16px;
}

.billing-skeleton__line--md {
  height: 20px;
}

.billing-skeleton__line--lg {
  height: 28px;
}

.billing-skeleton__line--xl {
  height: 36px;
}

.billing-skeleton__row {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.billing-skeleton__row--transaction {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--border-default);
}

.billing-skeleton__row--transaction:last-child {
  border-bottom: none;
}

.billing-skeleton__circle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--border-default);
  flex-shrink: 0;
}

.billing-skeleton__content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.billing-skeleton__button {
  height: 40px;
  background: var(--border-default);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
}

.billing-skeleton__divider {
  height: 1px;
  background: var(--border-default);
  margin: var(--space-md) 0;
}

.billing-skeleton__section {
  margin-top: var(--space-lg);
}