/**
 * Skeleton Loading Styles
 * Dark/Light mode compatible
 * Responsive design
 */

/* Skeleton Wrapper */
.skeleton-wrapper {
  width: 100%;
  padding: 20px 0;
}

.skeleton-loading-message {
  text-align: center;
  font-size: 14px;
  color: var(--coms-meta, #999);
  margin-bottom: 20px;
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}

/* Skeleton Grid Layout */
.skeleton-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  padding: 0;
}

/* Responsive Grid */
@media (max-width: 1200px) {
  .skeleton-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .skeleton-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
  }
}

@media (max-width: 480px) {
  .skeleton-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
}

/* Book Card Skeleton */
.skeleton-book-card {
  background: var(--block-bg, #fff);
  border-radius: 8px;
  padding: 12px;
  overflow: hidden;
}

.skeleton-cover {
  width: 100%;
  padding-bottom: 150%; /* 2:3 aspect ratio */
  border-radius: 6px;
  margin-bottom: 12px;
  position: relative;
  overflow: hidden;
}

.skeleton-title {
  height: 18px;
  border-radius: 4px;
  margin-bottom: 8px;
  width: 90%;
}

.skeleton-author {
  height: 14px;
  border-radius: 4px;
  margin-bottom: 8px;
  width: 70%;
}

.skeleton-meta {
  height: 12px;
  border-radius: 4px;
  width: 50%;
}

/* List Item Skeleton */
.skeleton-list-item {
  display: flex;
  align-items: center;
  gap: 15px;
  padding: 15px;
  background: var(--block-bg, #fff);
  border-radius: 8px;
  margin-bottom: 10px;
}

.skeleton-avatar {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  flex-shrink: 0;
}

.skeleton-text-block {
  flex: 1;
}

.skeleton-text {
  height: 14px;
  border-radius: 4px;
  margin-bottom: 8px;
  width: 100%;
}

.skeleton-text.short {
  width: 60%;
}

/* Detail Page Skeleton */
.skeleton-detail {
  background: var(--block-bg, #fff);
  border-radius: 8px;
  padding: 20px;
}

.skeleton-hero {
  width: 100%;
  height: 300px;
  border-radius: 8px;
  margin-bottom: 20px;
}

.skeleton-content {
  padding: 20px 0;
}

/* Skeleton Element Base */
.skeleton-cover,
.skeleton-title,
.skeleton-author,
.skeleton-meta,
.skeleton-avatar,
.skeleton-text,
.skeleton-hero {
  background: linear-gradient(
    90deg,
    var(--skeleton-base, #e0e0e0) 0%,
    var(--skeleton-highlight, #f5f5f5) 50%,
    var(--skeleton-base, #e0e0e0) 100%
  );
  background-size: 200% 100%;
  animation: skeleton-shimmer 2s ease-in-out infinite;
}

/* Dark Mode Colors */
html.darktheme .skeleton-cover,
html.darktheme .skeleton-title,
html.darktheme .skeleton-author,
html.darktheme .skeleton-meta,
html.darktheme .skeleton-avatar,
html.darktheme .skeleton-text,
html.darktheme .skeleton-hero {
  --skeleton-base: #2a2d3a;
  --skeleton-highlight: #363a4f;
  background: linear-gradient(
    90deg,
    var(--skeleton-base) 0%,
    var(--skeleton-highlight) 50%,
    var(--skeleton-base) 100%
  );
}

/* Light Mode Colors */
html:not(.darktheme) .skeleton-cover,
html:not(.darktheme) .skeleton-title,
html:not(.darktheme) .skeleton-author,
html:not(.darktheme) .skeleton-meta,
html:not(.darktheme) .skeleton-avatar,
html:not(.darktheme) .skeleton-text,
html:not(.darktheme) .skeleton-hero {
  --skeleton-base: #e0e0e0;
  --skeleton-highlight: #f5f5f5;
}

/* Shimmer Animation */
@keyframes skeleton-shimmer {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* Pulse Animation */
@keyframes skeleton-pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.6;
  }
}

/* Append Wrapper (for infinite scroll) */
.skeleton-append-wrapper {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 20px;
}

@media (max-width: 1200px) {
  .skeleton-append-wrapper {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .skeleton-append-wrapper {
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
  }
}

/* Smooth Fade In */
.skeleton-loading {
  animation: skeleton-fade-in 0.3s ease-in-out;
}

@keyframes skeleton-fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Accessibility */
.skeleton-wrapper[aria-busy="true"] {
  pointer-events: none;
}

/* Performance Optimization */
.skeleton-cover,
.skeleton-title,
.skeleton-author,
.skeleton-meta,
.skeleton-avatar,
.skeleton-text,
.skeleton-hero {
  will-change: background-position;
}