/* 图书详情页 — 对齐参考布局 */

.page-book-detail .main-content.book-detail-page {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 24px 48px;
  width: 100%;
  box-sizing: border-box;
}

.page-book-detail .page-wrap {
  background: var(--bg-page);
}

/* 顶栏：面包屑 + 搜索 */
.book-detail-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.book-detail-breadcrumb {
  margin: 0;
  font-size: 14px;
  color: var(--text-muted);
  flex: 1;
  min-width: 200px;
}

.book-detail-breadcrumb a {
  color: var(--text-secondary);
}

.book-detail-breadcrumb a:hover {
  color: var(--primary);
}

.book-detail-breadcrumb .sep {
  margin: 0 6px;
  color: #ccc;
}

.book-detail-search {
  display: flex;
  align-items: center;
  gap: 0;
  flex-shrink: 0;
  min-width: 280px;
  max-width: 420px;
  flex: 0 1 420px;
}

.book-detail-search input {
  flex: 1;
  min-width: 0;
  height: 36px;
  padding: 0 14px;
  border: 1px solid #ddd;
  border-right: none;
  border-radius: 4px 0 0 4px;
  font-size: 14px;
  outline: none;
  box-sizing: border-box;
}

.book-detail-search input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(255, 107, 53, 0.12);
}

.book-detail-search-btn {
  height: 36px;
  padding: 0 22px;
  border: none;
  border-radius: 0 4px 4px 0;
  background: var(--primary);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.2s;
}

.book-detail-search-btn:hover {
  background: var(--primary-dark);
}

/* 主体：左内容 + 右侧栏 */
.book-detail-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 0;
  align-items: start;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 4px;
}

.book-detail-main {
  min-width: 0;
  border-right: 1px solid var(--border);
}

/* 图书信息头 */
.book-detail-hero {
  display: flex;
  gap: 28px;
  padding: 28px 32px 24px;
  border-bottom: 1px solid var(--border);
}

.book-detail-cover {
  flex-shrink: 0;
  width: 160px;
}

.book-detail-cover img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: contain;
}

.book-detail-summary {
  flex: 1;
  min-width: 0;
}

.book-detail-title-row {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin: 0 0 16px;
  min-width: 0;
}

.book-detail-title {
  flex: 1;
  min-width: 0;
  margin: 0;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text);
}

.book-detail-fav-btn {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  margin-top: 2px;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  border-radius: 4px;
  transition: background 0.2s, transform 0.15s;
}

.book-detail-fav-btn:hover {
  background: var(--primary-bg);
}

.book-detail-fav-btn.is-active {
  background: var(--primary-bg);
}

.book-detail-fav-icon {
  display: block;
  width: 24px;
  height: 24px;
  object-fit: contain;
}

.book-detail-meta-list {
  margin: 0 0 14px;
}

.book-detail-meta-list p {
  margin: 0 0 8px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-secondary);
}

.book-detail-meta-list .label {
  color: var(--text-muted);
}

.book-detail-meta-list .level-tag {
  display: inline-block;
  padding: 1px 8px;
  border: 1px solid #ddd;
  border-radius: 2px;
  background: #fafafa;
  color: var(--text-secondary);
  font-size: 13px;
}

/* 选项卡 */
.book-detail-tabs {
  padding: 0 32px 32px;
}

.book-detail-tablist {
  display: flex;
  gap: 0;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
  border-bottom: 1px solid var(--border);
}

.book-detail-tablist button {
  position: relative;
  margin: 0;
  padding: 12px 28px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 15px;
  font-family: inherit;
  cursor: pointer;
  transition: color 0.2s;
}

.book-detail-tablist button:hover {
  color: var(--text);
}

.book-detail-tablist button.is-active {
  color: var(--primary);
  font-weight: 600;
}

.book-detail-tablist button.is-active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: var(--primary);
}

.book-detail-tabpanel {
  display: none;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-secondary);
}

.book-detail-tabpanel.is-active {
  display: block;
}

.book-detail-tabpanel p {
  margin: 0 0 14px;
  text-align: justify;
}

.book-detail-catalog-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.book-detail-catalog-list li {
  padding: 10px 0;
  border-bottom: 1px dashed var(--border);
  font-size: 14px;
  color: var(--text-secondary);
}

.book-detail-micro-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.book-detail-micro-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}

.book-detail-micro-title {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
}

.book-detail-micro-play {
  flex-shrink: 0;
  display: block;
  width: 18px;
  height: 18px;
  object-fit: contain;
}

.book-detail-micro-name {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.book-detail-micro-actions {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  gap: 8px;
}

.book-detail-micro-actions .book-detail-btn {
  min-width: 56px;
  height: 30px;
  padding: 0 12px;
  font-size: 13px;
}

/* 微课：观看 / 下载按钮 */
.book-detail-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 64px;
  height: 32px;
  padding: 0 16px;
  border-radius: 4px;
  font-size: 14px;
  font-family: inherit;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  box-sizing: border-box;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.book-detail-btn--outline {
  border: 1px solid var(--primary);
  background: #fff;
  color: var(--primary);
}

.book-detail-btn--outline:hover {
  background: var(--primary-bg);
}

.book-detail-btn--primary {
  border: 1px solid var(--primary);
  background: var(--primary);
  color: #fff;
}

.book-detail-btn--primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
}

/* 右侧资源栏 */
.book-detail-sidebar {
  padding: 20px 16px 24px;
  min-width: 0;
}

.book-detail-resource-block {
  margin-bottom: 28px;
}

.book-detail-resource-block:last-child {
  margin-bottom: 0;
}

.book-detail-resource-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 14px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.book-detail-resource-head::before {
  content: "";
  width: 3px;
  height: 16px;
  background: var(--primary);
  border-radius: 2px;
  flex-shrink: 0;
}

.book-detail-resource-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.book-detail-resource-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid #f5f5f5;
  font-size: 14px;
  color: var(--text-secondary);
}

.book-detail-resource-list li:last-child {
  border-bottom: none;
}

.book-detail-resource-icon {
  flex-shrink: 0;
  display: block;
  width: 22px;
  height: 22px;
  object-fit: contain;
}

.book-detail-resource-name {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.book-detail-resource-dl {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 0;
  border-radius: 4px;
  transition: background 0.2s;
}

.book-detail-resource-dl:hover {
  background: var(--primary-bg);
}

.book-detail-resource-dl img {
  display: block;
  width: 20px;
  height: 20px;
  object-fit: contain;
}

.book-detail-empty {
  padding: 48px 24px;
  text-align: center;
  color: var(--text-muted);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 4px;
}

@media (max-width: 992px) {
  .page-book-detail .page-wrap {
    padding-top: 0;
  }

  .book-detail-body {
    grid-template-columns: 1fr;
  }

  .book-detail-main {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .book-detail-hero {
    flex-direction: column;
    padding: 20px;
  }

  .book-detail-cover {
    width: 140px;
    margin: 0 auto;
  }

  .book-detail-tabs {
    padding: 0 20px 24px;
  }

  .book-detail-tablist {
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .book-detail-tablist::-webkit-scrollbar {
    display: none;
  }

  .book-detail-tablist button {
    flex-shrink: 0;
    white-space: nowrap;
  }

  .book-detail-sidebar {
    padding: 16px;
  }
}

@media (max-width: 768px) {
  .page-book-detail .main-content.book-detail-page {
    padding: 12px 12px 32px;
  }

  .book-detail-topbar {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    margin-bottom: 12px;
  }

  .book-detail-breadcrumb {
    min-width: 0;
    font-size: 12px;
    overflow-x: auto;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
  }

  .book-detail-search {
    max-width: none;
    flex: 1;
    min-width: 0;
    width: 100%;
  }

  .book-detail-search input {
    font-size: 16px;
  }

  .book-detail-hero {
    padding: 16px;
    gap: 16px;
  }

  .book-detail-cover {
    width: 120px;
  }

  .book-detail-title {
    font-size: 17px;
  }

  .book-detail-tabs {
    padding: 0 16px 20px;
  }

  .book-detail-tablist {
    margin-bottom: 14px;
  }

  .book-detail-meta-list p {
    font-size: 13px;
  }

  .book-detail-micro-list li {
    flex-wrap: nowrap;
    align-items: center;
    gap: 8px;
    padding: 10px 0;
  }

  .book-detail-micro-title {
    font-size: 13px;
  }

  .book-detail-micro-play {
    width: 16px;
    height: 16px;
  }

  .book-detail-micro-actions {
    flex-shrink: 0;
    width: auto;
    gap: 6px;
  }

  .book-detail-micro-actions .book-detail-btn {
    flex: none;
    min-width: 48px;
    height: 28px;
    padding: 0 10px;
    font-size: 12px;
  }

  .book-detail-resource-list li {
    flex-wrap: wrap;
  }

  .book-detail-resource-name {
    white-space: normal;
  }
}

/* 收藏等操作页面提示 */
.book-detail-tip {
  position: fixed;
  left: 50%;
  top: 50%;
  z-index: 2000;
  max-width: calc(100vw - 48px);
  padding: 11px 22px;
  border-radius: 4px;
  background: rgba(51, 51, 51, 0.88);
  color: #fff;
  font-size: 14px;
  line-height: 1.4;
  text-align: center;
  white-space: nowrap;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
  transform: translate(-50%, calc(-50% + 12px));
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    opacity 0.25s ease,
    transform 0.25s ease,
    visibility 0.25s ease;
}

.book-detail-tip.is-show {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, -50%);
}