/**
 * BannerCast - Loading States
 * 
 * Spinner, skeleton loaders, and button loading states
 */

/* ================================
   SPINNER
   ================================ */

.loading-spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.loading-spinner--sm {
  width: 14px;
  height: 14px;
  border-width: 2px;
}

.loading-spinner--lg {
  width: 32px;
  height: 32px;
  border-width: 3px;
}

.loading-spinner--xl {
  width: 48px;
  height: 48px;
  border-width: 4px;
}

/* Color variants */
.loading-spinner--primary {
  border-color: var(--color-primary-glow);
  border-top-color: var(--color-primary);
}

.loading-spinner--white {
  border-color: rgba(255, 255, 255, 0.3);
  border-top-color: white;
}

.loading-spinner--dark {
  border-color: rgba(0, 0, 0, 0.1);
  border-top-color: var(--color-text);
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ================================
   SKELETON LOADER
   ================================ */

.loading-skeleton {
  background: linear-gradient(
    90deg,
    var(--color-bg-tertiary) 25%,
    var(--color-bg-secondary) 50%,
    var(--color-bg-tertiary) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

.loading-skeleton--text {
  height: 1em;
  width: 100%;
  margin-bottom: 0.5em;
}

.loading-skeleton--text:last-child {
  width: 70%;
}

.loading-skeleton--title {
  height: 1.5em;
  width: 60%;
  margin-bottom: 1em;
}

.loading-skeleton--avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
}

.loading-skeleton--button {
  height: 44px;
  width: 120px;
  border-radius: var(--radius-md);
}

.loading-skeleton--card {
  height: 200px;
  border-radius: var(--radius-md);
}

.loading-skeleton--input {
  height: 44px;
  border-radius: var(--radius-md);
}

@keyframes skeleton-shimmer {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* ================================
   BUTTON LOADING STATE
   ================================ */

.btn.loading {
  position: relative;
  pointer-events: none;
  color: transparent !important;
}

.btn.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 18px;
  height: 18px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* Adjust spinner color based on button variant */
.btn-primary.loading::after,
.btn-secondary.loading::after,
.btn-danger.loading::after {
  border-color: rgba(255, 255, 255, 0.3);
  border-top-color: white;
}

.btn-outline.loading::after,
.btn-ghost.loading::after {
  border-color: var(--color-border);
  border-top-color: var(--color-primary);
}

/* Small button spinner */
.btn-sm.loading::after {
  width: 14px;
  height: 14px;
  border-width: 2px;
}

/* Large button spinner */
.btn-lg.loading::after {
  width: 22px;
  height: 22px;
  border-width: 2.5px;
}

/* Button with spinner beside text (alternative) */
.btn.loading-inline {
  pointer-events: none;
  opacity: 0.8;
}

.btn.loading-inline .loading-spinner {
  margin-right: var(--spacing-xs);
  vertical-align: middle;
}

/* ================================
   LOADING OVERLAY
   ================================ */

.loading-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(10, 10, 16, 0.8);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  z-index: var(--z-modal);
  border-radius: inherit;
}

.loading-overlay--transparent {
  background: rgba(10, 10, 16, 0.5);
}

.loading-overlay-text {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* ================================
   LOADING TOAST (special variant)
   ================================ */

.toast--loading {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.toast--loading .loading-spinner {
  flex-shrink: 0;
}

/* ================================
   PAGE LOADING STATE
   ================================ */

.page-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  gap: var(--spacing-md);
}

.page-loading-text {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* ================================
   PROGRESS BAR (optional)
   ================================ */

.loading-progress {
  width: 100%;
  height: 4px;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.loading-progress-bar {
  height: 100%;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  transition: width 0.3s ease;
}

.loading-progress-bar--indeterminate {
  width: 30%;
  animation: progress-indeterminate 1.5s ease-in-out infinite;
}

@keyframes progress-indeterminate {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(400%);
  }
}

/* ================================
   UTILITY CLASSES
   ================================ */

/* Hide element and show loading */
.is-loading {
  position: relative;
}

.is-loading > *:not(.loading-overlay):not(.loading-spinner) {
  opacity: 0.3;
  pointer-events: none;
}

/* Pulse animation for subtle loading indication */
.loading-pulse {
  animation: loading-pulse 2s ease-in-out infinite;
}

@keyframes loading-pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}