/* Enhanced Loading States CSS */

/* ===== LOADING SPINNERS ===== */

.loading-spinner {
  animation: spin 1s linear infinite;
  margin: 0 auto;
  border: 2px solid var(--border-color);
  border-top: 2px solid var(--primary-color);
  border-radius: 50%;
  width: 24px;
  height: 24px;
}

.inline-spinner {
  display: inline-block;
  animation: spin 1s linear infinite;
  margin-right: 8px;
  border: 2px solid var(--border-color);
  border-top: 2px solid var(--primary-color);
  border-radius: 50%;
  width: 16px;
  height: 16px;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(360deg);
  }
}

/* ===== SKELETON LOADERS ===== */

.skeleton-loading {
  pointer-events: none;
  user-select: none;
}

.skeleton-artwork,
.skeleton-title,
.skeleton-artist,
.skeleton-meta,
.skeleton-description,
.skeleton-badge,
.skeleton-timestamp {
  animation: skeleton-loading 1.5s ease-in-out infinite;
  border-radius: var(--border-radius-sm);
  background: linear-gradient(
    90deg,
    var(--bg-alt) 25%,
    rgb(255 255 255 / 50%) 50%,
    var(--bg-alt) 75%
  );
  background-size: 200% 100%;
}

.skeleton-artwork {
  border-radius: var(--border-radius);
  width: var(--artwork-size);
  height: var(--artwork-size);
}

.skeleton-title {
  margin-bottom: 8px;
  width: 70%;
  height: 24px;
}

.skeleton-artist {
  margin-bottom: 6px;
  width: 50%;
  height: 18px;
}

.skeleton-meta {
  margin-bottom: 12px;
  width: 40%;
  height: 16px;
}

.skeleton-description {
  margin-bottom: 8px;
  width: 100%;
  height: 16px;
}

.skeleton-description:nth-child(2) {
  width: 85%;
}

.skeleton-description:nth-child(3) {
  width: 60%;
}

.skeleton-badge {
  border-radius: 10px;
  width: 60px;
  height: 20px;
}

.skeleton-timestamp {
  width: 80px;
  height: 14px;
}

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

  100% {
    background-position: 200% 0;
  }
}

/* ===== SKELETON GRID ===== */

.skeleton-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
  gap: var(--space-lg);
  padding: var(--space-lg);
}

.skeleton-grid .loading-text {
  display: flex;
  grid-column: 1 / -1;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-xl);
  color: var(--text-muted);
  text-align: center;
}

/* ===== PROGRESSIVE LOADER ===== */

.progressive-loader {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
  padding: var(--space-2xl);
  text-align: center;
}

.loading-stages {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  min-width: 250px;
}

.stage {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  opacity: 0.4;
  transition: var(--transition);
  border-radius: var(--border-radius-sm);
  padding: var(--space-sm) var(--space-md);
}

.stage.active {
  opacity: 1;
  background: rgb(22 163 74 / 10%);
  color: var(--primary-color);
}

.stage.complete {
  opacity: 0.6;
  color: var(--text-muted);
}

.stage.complete .stage-icon {
  filter: grayscale(1);
}

.stage-icon {
  transition: var(--transition);
  font-size: 1.2em;
}

.stage.active .stage-icon {
  animation: pulse 2s ease-in-out infinite;
}

.stage-text {
  font-weight: 500;
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.1);
  }
}

/* ===== INLINE LOADERS ===== */

.inline-loader {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--text-muted);
  font-size: 0.9em;
}

/* ===== LOADING OVERLAYS ===== */

.loading-overlay {
  display: flex;
  position: absolute;
  justify-content: center;
  align-items: center;
  z-index: 10;
  backdrop-filter: blur(2px);
  inset: 0;
  border-radius: var(--border-radius);
  background: rgb(248 249 250 / 90%);
}

.loading-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  box-shadow: var(--shadow-md);
  border-radius: var(--border-radius);
  background: white;
  padding: var(--space-lg);
}

/* ===== ENHANCED EXISTING LOADING STATE ===== */

.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
  padding: var(--space-2xl);
  color: var(--text-muted);
}

.loading::before {
  animation: spin 1s linear infinite;
  border: 3px solid var(--border-color);
  border-top: 3px solid var(--primary-color);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  content: '';
}

/* ===== TRACK ENRICHMENT LOADING ===== */

.loading-enrichment {
  opacity: 0.8;
  transition: var(--transition);
}

.loading-pulse {
  animation: loading-pulse 2s ease-in-out infinite;
}

@keyframes loading-pulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 1;
  }

  50% {
    transform: scale(1.02);
    opacity: 0.7;
  }
}

.track-enrichment-status {
  margin-top: var(--space-sm);
  color: var(--text-muted);
  font-size: 0.85em;
}

/* ===== LOADING TRANSITIONS ===== */

.loading-active {
  transition:
    opacity 0.2s ease,
    transform 0.2s ease;
}

.fade-transition {
  transform: translateY(10px);
  opacity: 0;
  transition:
    opacity 0.3s ease,
    transform 0.3s ease;
}

.fade-transition.loaded {
  transform: translateY(0);
  opacity: 1;
}

/* ===== DARK THEME ADJUSTMENTS ===== */

[data-theme='dark'] .skeleton-artwork,
[data-theme='dark'] .skeleton-title,
[data-theme='dark'] .skeleton-artist,
[data-theme='dark'] .skeleton-meta,
[data-theme='dark'] .skeleton-description,
[data-theme='dark'] .skeleton-badge,
[data-theme='dark'] .skeleton-timestamp {
  background: linear-gradient(
    90deg,
    #374151 25%,
    rgb(75 85 99 / 50%) 50%,
    #374151 75%
  );
  background-size: 200% 100%;
}

[data-theme='dark'] .loading-overlay {
  background: rgb(31 41 55 / 90%);
}

[data-theme='dark'] .loading-content {
  background: #374151;
  color: #f9fafb;
}

[data-theme='dark'] .stage.active {
  background: rgb(99 102 241 / 20%);
  color: #c7d2fe;
}

/* ===== MOBILE RESPONSIVENESS ===== */

@media (max-width: 768px) {
  .skeleton-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
    padding: var(--space-md);
  }

  .progressive-loader {
    padding: var(--space-lg);
  }

  .loading-stages {
    min-width: auto;
  }

  .stage {
    padding: var(--space-sm);
    font-size: 0.9em;
  }
}

/* ===== ACCESSIBILITY ===== */

@media (prefers-reduced-motion: reduce) {
  .loading-spinner,
  .inline-spinner,
  .skeleton-loading *,
  .stage.active .stage-icon {
    animation: none;
  }

  .skeleton-artwork,
  .skeleton-title,
  .skeleton-artist,
  .skeleton-meta,
  .skeleton-description,
  .skeleton-badge,
  .skeleton-timestamp {
    background: var(--bg-alt);
  }
}

/* ===== INFINITE SCROLL LOADING ===== */

.loading-more {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl) var(--space-md);
  margin-top: var(--space-lg);
}

.loading-more-spinner {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  color: var(--text-secondary);
  font-size: 0.95em;
}

.loading-more-spinner .spinner {
  animation: spin 1s linear infinite;
  border: 2px solid var(--border-color);
  border-top: 2px solid var(--primary-color);
  border-radius: 50%;
  width: 20px;
  height: 20px;
}

.loading-more-error {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-lg);
  color: var(--text-secondary);
  text-align: center;
}

.loading-more-error p {
  margin: 0;
  font-size: 0.95em;
}

.loading-more-error .btn {
  padding: var(--space-sm) var(--space-lg);
  font-size: 0.9em;
}

#scroll-sentinel {
  height: 1px;
  opacity: 0;
  pointer-events: none;
}