/* ============================================
   LOADING STATES & SKELETON SCREENS
   ============================================ */

/* Base Skeleton Styles */
.skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
  border-radius: 8px;
  position: relative;
  overflow: hidden;
}

[data-theme="dark"] .skeleton {
  background: linear-gradient(90deg, #1a2332 25%, #2d3748 50%, #1a2332 75%);
  background-size: 200% 100%;
}

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

/* Skeleton Card (for dog profiles, posts) */
.skeleton-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--round);
  padding: 0;
  margin-bottom: 24px;
  overflow: hidden;
}

.skeleton-card-header {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  background: linear-gradient(135deg, #fafbfc 0%, #f0f4f8 100%);
}

[data-theme="dark"] .skeleton-card-header {
  background: linear-gradient(135deg, #1a2332 0%, #2d3748 100%);
}

.skeleton-avatar {
  width: 56px;
  height: 56px;
  border-radius: 10%;
  flex-shrink: 0;
}

.skeleton-header-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.skeleton-text {
  height: 16px;
  border-radius: 4px;
}

.skeleton-text-lg {
  height: 24px;
  border-radius: 6px;
}

.skeleton-text-sm {
  height: 12px;
  border-radius: 3px;
}

.skeleton-image {
  width: 100%;
  height: 300px;
  border-radius: 0;
}

.skeleton-card-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.skeleton-action-bar {
  display: flex;
  gap: 16px;
  padding: 18px 24px;
  border-top: 1px solid var(--border);
}

.skeleton-button {
  width: 100px;
  height: 40px;
  border-radius: 8px;
}

/* Skeleton Feed */
.skeleton-feed {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* Skeleton Grid (for dog cards) */
.skeleton-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

/* Skeleton Stats */
.skeleton-stats {
  display: flex;
  gap: 10px;
  margin-top: 12px;
}

.skeleton-stat {
  flex: 1;
  height: 80px;
  border-radius: 12px;
}

/* Spinner Loading States */
.spinner {
  border: 3px solid rgba(31, 182, 255, 0.1);
  border-top: 3px solid var(--accent);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 0.8s linear infinite;
}

.spinner-sm {
  width: 20px;
  height: 20px;
  border-width: 2px;
}

.spinner-lg {
  width: 60px;
  height: 60px;
  border-width: 4px;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  backdrop-filter: blur(4px);
}

.loading-overlay-content {
  background: var(--card);
  padding: 32px 40px;
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.loading-overlay-content .spinner {
  margin-bottom: 8px;
}

.loading-text {
  color: var(--primary);
  font-weight: 600;
  font-size: 1.1rem;
}

/* Inline Loading State */
.loading-inline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.loading-inline .spinner {
  width: 16px;
  height: 16px;
  border-width: 2px;
}

/* Button Loading State */
.btn-loading {
  position: relative;
  color: transparent !important;
  pointer-events: none;
}

.btn-loading::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  top: 50%;
  left: 50%;
  margin-left: -8px;
  margin-top: -8px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  color: white;
}

/* Progress Bar */
.progress-bar-container {
  width: 100%;
  height: 8px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
  position: relative;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
  border-radius: 999px;
  transition: width 0.3s ease;
  position: relative;
}

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

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

/* Pulsing Dots Loader */
.dots-loader {
  display: inline-flex;
  gap: 8px;
}

.dots-loader span {
  width: 10px;
  height: 10px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse-dot 1.4s infinite ease-in-out both;
}

.dots-loader span:nth-child(1) {
  animation-delay: -0.32s;
}

.dots-loader span:nth-child(2) {
  animation-delay: -0.16s;
}

@keyframes pulse-dot {
  0%, 80%, 100% {
    transform: scale(0.6);
    opacity: 0.4;
  }
  40% {
    transform: scale(1);
    opacity: 1;
  }
}

/* Mobile Skeleton Adjustments */
@media (max-width: 576px) {
  .skeleton-card {
    margin-bottom: 16px;
  }

  .skeleton-image {
    height: 240px;
  }

  .skeleton-card-body {
    padding: 16px;
    gap: 10px;
  }

  .skeleton-action-bar {
    padding: 12px 16px;
    gap: 12px;
  }

  .skeleton-button {
    width: 80px;
    height: 36px;
  }

  .skeleton-avatar {
    width: 48px;
    height: 48px;
  }

  .skeleton-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .loading-overlay-content {
    padding: 24px 28px;
  }
}

/* Accessibility: Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  .skeleton,
  .spinner,
  .progress-bar-indeterminate,
  .dots-loader span {
    animation: none;
  }

  .skeleton {
    background: #e0e0e0;
  }

  [data-theme="dark"] .skeleton {
    background: #2d3748;
  }
}