/* ========== 左侧分类导航 ========== */
.sidebar {
  position: fixed;
  left: 0;
  top: 60px;
  bottom: 0;
  width: 240px;
  background: #fff;
  padding: 20px 0;
  overflow-y: auto;
  z-index: 99;
  border-right: 1px solid var(--border);
}

.sidebar::-webkit-scrollbar {
  width: 4px;
}

.sidebar::-webkit-scrollbar-thumb {
  background: #ddd;
  border-radius: 2px;
}

.category-list {
  list-style: none;
}

.category-list .category-item {
  margin-bottom: 2px;
}

.category-list .category-item a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  color: #666;
  text-decoration: none;
  font-size: 14px;
  transition: all 0.2s;
}

.category-list .category-item a:hover {
  background: #f5f5f5;
  color: #333;
}

.category-list .category-item.active a {
  background: #fff0f0;
  color: #e60023;
  font-weight: 500;
}

/* ========== 右侧内容区 ========== */
.content {
  margin-left: 240px;
  margin-top: 60px;
  min-height: calc(100vh - 60px);
  display: flex;
  flex-direction: column;
}

/* 分类标题 */
.content-header {
  background: #fff;
  padding: 24px 24px 16px;
  display: flex;
  align-items: center;
  gap: 16px;
  border-bottom: 1px solid var(--border);
}

.category-title {
  font-size: 20px;
  font-weight: 600;
  color: #333;
}

.category-count {
  font-size: 14px;
  color: #999;
}

/* ========== 筛选栏 ========== */
.filter-bar {
  background: #fff;
  padding: 0 24px;
}

/* 类别筛选 */
.category-filter {
  display: flex;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid #f0f0f0;
  position: relative;
}

.category-filter-inner {
  flex: 1;
  overflow: hidden;
}

.category-tags-scroll {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.category-tags-scroll::-webkit-scrollbar {
  display: none;
}

.category-tag {
  flex-shrink: 0;
  padding: 6px 14px;
  border: 1px solid #e5e5e5;
  border-radius: 4px;
  background: #fff;
  font-size: 13px;
  color: #666;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s;
}

.category-tag:hover {
  border-color: #e60023;
  color: #e60023;
}

.category-tag.active {
  background: #e60023;
  border-color: #e60023;
  color: #fff;
}

.category-more-btn {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 12px;
  border: none;
  background: #fff;
  color: #666;
  font-size: 13px;
  cursor: pointer;
  transition: color 0.2s;
}

.category-more-btn:hover {
  color: #e60023;
}

.category-arrow {
  transition: transform 0.2s;
}

.category-more-btn.active .category-arrow {
  transform: rotate(180deg);
}

/* 下拉展开更多类别 */
.category-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 60px;
  background: #fff;
  border: 1px solid #e5e5e5;
  border-radius: 8px;
  padding: 12px;
  display: none;
  flex-wrap: wrap;
  gap: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  z-index: 10;
}

.category-dropdown.show {
  display: flex;
}

/* 格式筛选 */
.format-filter {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid #f0f0f0;
}

.filter-label {
  font-size: 14px;
  color: #999;
  flex-shrink: 0;
}

.filter-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.filter-tag {
  padding: 4px 12px;
  border: 1px solid #e5e5e5;
  border-radius: 4px;
  background: #fff;
  font-size: 13px;
  color: #666;
  cursor: pointer;
  transition: all 0.2s;
}

.filter-tag:hover {
  border-color: #e60023;
  color: #e60023;
}

.filter-tag.active {
  background: #e60023;
  border-color: #e60023;
  color: #fff;
}

/* 排序 */
.sort-filter {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
}

.sort-tabs {
  display: flex;
  gap: 4px;
}

.sort-tab {
  padding: 6px 14px;
  border: none;
  background: transparent;
  font-size: 14px;
  color: #666;
  cursor: pointer;
  transition: all 0.2s;
  border-radius: 4px;
}

.sort-tab:hover {
  background: #f5f5f5;
  color: #333;
}

.sort-tab.active {
  background: #fff0f0;
  color: #e60023;
  font-weight: 500;
}

/* ========== 素材列表 ========== */
.material-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  padding: 16px 24px;
  flex: 1;
}

.material-card {
  background: #fff;
  border-radius: 8px;
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

.material-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}

.material-thumb {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  background: #f0f0f0;
  display: block;
}

.material-info {
  padding: 12px;
}

.material-title {
  font-size: 14px;
  color: #333;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.4;
}

.material-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: #999;
}

.material-format {
  padding: 2px 6px;
  background: #f5f5f5;
  border-radius: 2px;
  font-weight: 500;
}

.material-stats {
  display: flex;
  align-items: center;
  gap: 8px;
}

.material-stats span {
  display: flex;
  align-items: center;
  gap: 2px;
}

/* ========== 分页 ========== */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 30px 24px;
  background: #fff;
  margin-top: auto;
  border-top: 1px solid var(--border);
}

.page-btn {
  padding: 8px 16px;
  border: 1px solid #e5e5e5;
  border-radius: 4px;
  background: #fff;
  font-size: 14px;
  color: #666;
  cursor: pointer;
  transition: all 0.2s;
}

.page-btn:hover:not(:disabled) {
  border-color: #e60023;
  color: #e60023;
}

.page-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.page-numbers {
  display: flex;
  align-items: center;
  gap: 4px;
}

.page-num {
  min-width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid #e5e5e5;
  border-radius: 4px;
  background: #fff;
  font-size: 14px;
  color: #666;
  cursor: pointer;
  transition: all 0.2s;
}

.page-num:hover {
  border-color: #e60023;
  color: #e60023;
}

.page-num.active {
  background: #e60023;
  border-color: #e60023;
  color: #fff;
}

.page-ellipsis {
  padding: 0 8px;
  color: #999;
}

.page-jump {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: 16px;
  font-size: 14px;
  color: #666;
}

.page-input {
  width: 50px;
  height: 32px;
  border: 1px solid #e5e5e5;
  border-radius: 4px;
  padding: 0 8px;
  text-align: center;
  font-size: 14px;
}

.page-jump-btn {
  padding: 6px 12px;
  border: 1px solid #e5e5e5;
  border-radius: 4px;
  background: #fff;
  font-size: 14px;
  color: #666;
  cursor: pointer;
  transition: all 0.2s;
}

.page-jump-btn:hover {
  border-color: #e60023;
  color: #e60023;
}

/* ========== 响应式 ========== */
@media (max-width: 1200px) {
  .material-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 900px) {
  .sidebar {
    display: none;
  }
  
  .content {
    margin-left: 0;
  }
  
  .material-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .material-list {
    grid-template-columns: 1fr;
  }
  
  .format-filter,
  .sort-filter {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}