/* ===== Book List ===== */

.news-layout {
    display: flex;
    gap: var(--spacing-xl);
    align-items: start;
}
.news-main {
    flex: 1;
    min-width: 0;
}
.news-sidebar {
    width: 300px;
    flex-shrink: 0;
}

.news-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--c-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}
.aside-card {
    background: var(--c-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}
.aside-card h3 {
    font-size: var(--text-base);
    font-weight: 700;
    padding: 14px 16px;
    color: var(--c-text);
    border-bottom: 1px solid var(--c-border-light);
    display: flex;
    align-items: center;
    gap: 8px;
}
.aside-card h3::before {
    content: '';
    width: 3px;
    height: 14px;
    background: var(--c-primary);
    border-radius: 2px;
    flex-shrink: 0;
}

/* ===== Book Show ===== */

.book-detail {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-lg) var(--spacing-lg);
}

.book-detail-breadcrumb {
  flex-wrap: wrap;
}

.book-detail-layout {
  display: flex;
  gap: var(--spacing-xl);
  align-items: flex-start;
}
.book-detail-main {
  flex: 1;
  min-width: 0;
}

.book-detail-header {
  display: flex;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
  background: var(--c-surface);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
}
.book-detail-cover {
  flex-shrink: 0;
  width: 200px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--c-bg);
  box-shadow: 0 2px 12px rgba(0,0,0,.1);
}
.book-detail-cover img {
  width: 100%;
  display: block;
}
.book-detail-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.book-detail-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--c-text);
  line-height: 1.35;
  margin: 0 0 var(--spacing-md);
}
.book-detail-meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: var(--spacing-lg);
}
.meta-item {
  font-size: var(--text-sm);
  color: var(--c-text-secondary);
  line-height: 1.6;
}
.meta-label {
  color: var(--c-text-muted);
  display: inline-block;
  min-width: 5em;
}
.book-detail-actions {
  display: flex;
  gap: var(--spacing-sm);
}
.book-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
  border: 1px solid var(--c-border);
  color: var(--c-text-secondary);
  background: var(--c-surface);
}
.book-action-btn:hover {
  border-color: var(--c-primary);
  color: var(--c-primary);
  background: var(--c-primary-light);
}
.book-action-buy {
  background: var(--c-primary);
  color: #fff;
  border-color: var(--c-primary);
}
.book-action-buy:hover {
  background: var(--c-primary-hover, #2563eb);
  color: #fff;
}
.book-action-like i {
  color: var(--c-danger);
}

.book-detail-body {
  background: var(--c-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  margin-bottom: var(--spacing-xl);
}
.book-detail-tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--c-border-light);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.book-detail-tabs .tab-item {
  flex-shrink: 0;
  padding: 12px 20px;
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--c-text-secondary);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color .2s, border-color .2s;
  white-space: nowrap;
}
.book-detail-tabs .tab-item:hover {
  color: var(--c-primary);
}
.book-detail-tabs .tab-item.active {
  color: var(--c-primary);
  border-bottom-color: var(--c-primary);
}

.tab-pane {
  display: none;
  padding: var(--spacing-lg);
}
.tab-pane.active {
  display: block;
}
.tab-pane-body {
  font-size: var(--text-sm);
  color: var(--c-text-secondary);
  line-height: 1.8;
}
.tab-pane-body p {
  margin: 0 0 var(--spacing-sm);
}

.intro-section {
  margin-bottom: var(--spacing-md);
  line-height: 1.9;
  color: var(--c-text-secondary);
}
.intro-excerpt {
  margin: 0 0 var(--spacing-md);
}
.book-full-content {
  margin-top: var(--spacing-md);
}

.detail-section {
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--c-border-light);
}
.detail-section:last-child {
  margin-bottom: 0;
}
.detail-section-title {
  font-size: var(--text-md);
  font-weight: 700;
  color: var(--c-text);
  margin: 0 0 var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--c-border-light);
  display: flex;
  align-items: center;
  gap: 8px;
}
.detail-section-title::before {
  content: '';
  width: 3px;
  height: 16px;
  background: var(--c-primary);
  border-radius: 2px;
  flex-shrink: 0;
}
.detail-section-body {
  font-size: var(--text-base);
  color: var(--c-text-secondary);
  line-height: 1.8;
}
.detail-section-body p {
  margin: 0 0 var(--spacing-sm);
}

.book-catalog {
  position: relative;
  max-height: 360px;
  overflow: hidden;
  transition: max-height .4s ease;
}
.book-catalog::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 80px;
  background: linear-gradient(transparent, var(--c-surface));
  pointer-events: none;
  transition: opacity .4s;
}
.book-catalog.expanded {
  max-height: none;
}
.book-catalog.expanded::after {
  opacity: 0;
}
.catalog-inner {
  font-size: var(--text-base);
  line-height: 1.9;
  color: var(--c-text-secondary);
  padding-bottom: 20px;
}
.catalog-toggle {
  text-align: center;
  padding: var(--spacing-sm) 0 0;
}
.catalog-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: var(--text-sm);
  color: var(--c-primary);
  cursor: pointer;
  transition: color .2s;
  user-select: none;
}
.catalog-toggle-btn:hover {
  color: var(--c-primary-hover, #2563eb);
}

.buy-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.buy-link-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  border-radius: 20px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  text-decoration: none;
  font-size: var(--text-sm);
  transition: all .2s;
}
.buy-link-pill:hover {
  border-color: var(--c-primary);
  color: var(--c-primary);
  box-shadow: 0 1px 6px rgba(37,99,235,.15);
}
.buy-link-pill-name {
  font-weight: 500;
  color: var(--c-text);
}
.buy-link-pill:hover .buy-link-pill-name {
  color: var(--c-primary);
}
.buy-link-pill-price {
  font-weight: 700;
  color: var(--c-primary);
  padding: 1px 6px;
  border-radius: 10px;
  background: var(--c-bg);
  font-size: var(--text-xs);
}
.buy-link-pill-arrow {
  color: var(--c-text-muted);
  transition: transform .2s;
}
.buy-link-pill:hover .buy-link-pill-arrow {
  transform: translate(2px, -1px);
  color: var(--c-primary);
}

.ebook-content {
  text-align: center;
  padding: var(--spacing-lg) 0;
}
.ebook-qrcode {
  display: flex;
  justify-content: center;
  margin-bottom: var(--spacing-lg);
}
.ebook-qrcode img {
  width: 4cm;
  border-radius: var(--radius-sm);
  box-shadow: 0 2px 8px rgba(0,0,0,.1);
}
.ebook-hint {
  font-size: var(--text-sm);
  color: var(--c-text-secondary);
  line-height: 1.8;
}
.ebook-code {
  color: var(--c-danger);
  font-weight: 700;
}
.text-muted {
  color: var(--c-text-muted);
}

.book-detail-sidebar {
  width: 300px;
  flex-shrink: 0;
  position: sticky;
  top: var(--spacing-lg);
}
.sidebar-related-list {
  list-style: none;
}
.sidebar-related-list li {
  padding: 10px 16px;
  border-bottom: 1px solid var(--c-border-light);
}
.sidebar-related-list li:last-child {
  border-bottom: none;
}
.sidebar-related-list li a {
  font-size: var(--text-sm);
  color: var(--c-text-secondary);
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color .2s;
  text-decoration: none;
}
.sidebar-related-list li a:hover {
  color: var(--c-primary);
}
@media (max-width: 1023px) {
  .book-detail-layout {
    flex-direction: column;
  }
  .book-detail-sidebar {
    width: 100%;
    position: static;
  }
}
@media (max-width: 767px) {
  .book-detail {
    padding: 0 var(--spacing-md) var(--spacing-md);
  }
  .book-detail-header {
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: var(--spacing-md);
  }
  .book-detail-cover {
    width: 160px;
  }
  .book-detail-meta {
    align-items: center;
  }
  .book-detail-actions {
    justify-content: center;
  }
  .book-detail-title {
    font-size: 18px;
  }
  .book-detail-tabs .tab-item {
    padding: 10px 14px;
    font-size: var(--text-sm);
  }
  .tab-pane {
    padding: var(--spacing-md);
  }
  .buy-link-pill {
    padding: 4px 10px;
    font-size: var(--text-xs);
  }
  .meta-label {
    min-width: 4em;
  }
}