/* 样式与之前一致，此处省略以节省篇幅，请从上一版本复制完整样式 */
/* 为了完整性，保留之前所有样式，但实际使用时请复制完整 CSS */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
:root {
  --primary: #2563eb;
  --primary-light: #3b82f6;
  --primary-dark: #1d4ed8;
  --primary-bg: #eff6ff;
  --primary-border: #bfdbfe;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 4px 16px rgba(0, 0, 0, 0.04);
  --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.08);
  --transition: 0.25s ease;
  --font: -apple-system, BlinkMacSystemFont, 'Poppins', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

.resource-section {
  width: 100%;
  max-width: 1200px;
  margin: 40px auto;
  height: 780px;
  max-height: 92vh;
  background: #ffffff;
  border-radius: 18px;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.08);
  display: flex;
  overflow: hidden;
  border: 1px solid var(--gray-200);
  position: relative;
}
.category-sidebar {
  width: 320px;
  min-width: 200px;
  background: var(--gray-50);
  border-right: 1px solid var(--gray-200);
  display: flex;
  flex-direction: column;
  padding: 20px 0 16px 0;
  overflow-y: auto;
  flex-shrink: 0;
}
.category-sidebar-header {
  padding: 0 18px 16px 18px;
  font-size: 15px;
  font-weight: 600;
  color: var(--gray-700);
  letter-spacing: 0.3px;
  border-bottom: 1px solid var(--gray-200);
  display: flex;
  align-items: center;
  gap: 8px;
}
.category-sidebar-header span {
  font-size: 18px;
}
.category-list {
  list-style: none;
  padding: 12px 10px 0 10px;
  flex: 1;
}
.category-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 16px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-600);
  margin-bottom: 3px;
  position: relative;
  user-select: none;
}
.category-item:hover {
  background: var(--gray-200);
  color: var(--gray-800);
}
.category-item.active {
  background: var(--primary-bg);
  color: var(--primary);
  font-weight: 600;
  box-shadow: inset 3px 0 0 var(--primary);
}
.category-item .cat-icon {
  font-size: 18px;
  max-width: 40px;
  text-align: center;
  flex-shrink: 0;
}
.category-item .cat-icon img {
  width: 100%;
}
.category-item .cat-name {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.category-item .cat-badge {
  background: var(--gray-200);
  color: var(--gray-600);
  font-size: 11px;
  font-weight: 600;
  padding: 2px 10px;
  border-radius: 30px;
  flex-shrink: 0;
  transition: all var(--transition);
}
.category-item.active .cat-badge {
  background: var(--primary-border);
  color: var(--primary);
}
.main-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: #ffffff;
  min-width: 0;
}
.product-list-area {
  padding: 18px 24px 12px 24px;
  border-bottom: 1px solid var(--gray-200);
  flex-shrink: 0;
  min-height: 280px;
  max-height: 350px;
  display: flex;
  flex-direction: column;
}
.product-list-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  flex-shrink: 0;
}
.product-list-header h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--gray-800);
}
.product-list-header .product-count {
  font-size: 13px;
  color: var(--gray-500);
  background: var(--gray-100);
  padding: 2px 12px;
  border-radius: 30px;
  flex-shrink: 0;
}
.product-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  overflow-y: auto;
  padding: 2px 0 6px 0;
  flex: 1;
  align-content: flex-start;
}
.product-grid::-webkit-scrollbar {
  width: 4px;
}
.product-grid::-webkit-scrollbar-track {
  background: transparent;
}
.product-grid::-webkit-scrollbar-thumb {
  background: var(--gray-300);
  border-radius: 10px;
}
.product-card {
  flex: 0 0 auto;
  max-width: 198px;
  padding: 12px 16px;
  background: var(--gray-50);
  border: 1.5px solid var(--gray-200);
  border-radius: 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-700);
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  text-align: center;
  gap: 6px;
  flex-direction: column;
}
.product-card:hover {
  background: var(--primary-bg);
  border-color: var(--primary-border);
  color: var(--primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-hover);
}
.product-card.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}
.product-card .p-icon {
  font-size: 15px;
  max-width: 110px;
}
.product-card .p-icon img {
  width: 100%;
}
.empty-products {
  color: var(--gray-400);
  font-size: 14px;
  padding: 20px 0;
  text-align: center;
  width: 100%;
}
.resource-detail-area {
  flex: 1;
  padding: 16px 24px 20px 24px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-height: 300px;
  background: #ffffff;
}
.resource-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--gray-400);
  gap: 8px;
}
.resource-placeholder .big-icon {
  font-size: 42px;
  opacity: 0.5;
}
.resource-placeholder p {
  font-size: 15px;
}
.section-tabs {
  display: flex;
  gap: 4px;
  border-bottom: 2px solid var(--gray-200);
  padding-bottom: 0;
  flex-shrink: 0;
  overflow-x: auto;
  flex-wrap: nowrap;
  margin-bottom: 12px;
}
.section-tabs::-webkit-scrollbar {
  height: 2px;
}
.section-tabs::-webkit-scrollbar-thumb {
  background: var(--gray-300);
  border-radius: 10px;
}
.section-tab {
  padding: 8px 5px 10px 5px;
  font-size: 13px;
  font-weight: 500;
  color: var(--gray-500);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: all var(--transition);
  white-space: nowrap;
  user-select: none;
  background: transparent;
  border-top: none;
  border-left: none;
  border-right: none;
  font-family: inherit;
  display: flex;
  align-items: center;
  gap: 6px;
}
.section-tab:hover {
  color: var(--gray-700);
  background: var(--gray-50);
  border-radius: 6px 6px 0 0;
}
.section-tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  font-weight: 600;
}
.section-tab .tab-icon {
  font-size: 15px;
}
.section-tab .tab-count {
  font-size: 11px;
  background: var(--gray-200);
  color: var(--gray-600);
  padding: 0 8px;
  border-radius: 30px;
  font-weight: 500;
  min-width: 20px;
  text-align: center;
}
.section-tab.active .tab-count {
  background: var(--primary-border);
  color: var(--primary);
}
.article-content {
  flex: 1;
  overflow-y: auto;
  padding: 4px 4px 4px 4px;
  margin-top: 2px;
  display: flex;
  flex-direction: column;
}
.article-content::-webkit-scrollbar {
  width: 5px;
}
.article-content::-webkit-scrollbar-track {
  background: transparent;
}
.article-content::-webkit-scrollbar-thumb {
  background: var(--gray-300);
  border-radius: 10px;
}
.article-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  animation: fadeIn 0.3s ease;
}
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.article-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: var(--gray-50);
  border-radius: 8px;
  border: 1px solid var(--gray-100);
  transition: all var(--transition);
}
.article-item:hover {
  background: var(--primary-bg);
  border-color: var(--primary-border);
}
.article-item .a-icon {
  font-size: 18px;
  width: 32px;
  text-align: center;
  flex-shrink: 0;
  color: var(--primary);
}
.article-item .a-title {
  flex: 1;
  font-size: 14px;
  color: var(--gray-700);
  font-weight: 450;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.article-item .a-link {
  font-size: 12px;
  color: var(--primary);
  background: transparent;
  border: 1px solid var(--primary-border);
  padding: 4px 14px;
  border-radius: 20px;
  cursor: pointer;
  transition: all var(--transition);
  font-weight: 500;
  flex-shrink: 0;
  text-decoration: none;
}
.article-item .a-link:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.article-empty {
  color: var(--gray-400);
  font-size: 14px;
  text-align: center;
  padding: 30px 0;
}
.pagination-controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  padding: 12px 0 4px 0;
  flex-shrink: 0;
  border-top: 1px solid var(--gray-100);
  margin-top: 8px;
}
.pagination-controls button {
  padding: 4px 16px;
  border: 1px solid var(--gray-300);
  border-radius: 6px;
  background: #fff;
  color: var(--gray-700);
  cursor: pointer;
  font-size: 13px;
  transition: all var(--transition);
}
.pagination-controls button:hover:not(:disabled) {
  background: var(--primary-bg);
  border-color: var(--primary);
  color: var(--primary);
}
.pagination-controls button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.pagination-controls .page-info {
  font-size: 13px;
  color: var(--gray-600);
}
.loading-spinner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: 14px;
  color: var(--gray-500);
}
.loading-spinner .spinner {
  width: 36px;
  height: 36px;
  border: 3.5px solid var(--gray-200);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}
.loading-spinner p {
  font-size: 14px;
}
@media (max-width: 900px) {
  .resource-section {
    height: auto;
    max-height: 98vh;
    flex-direction: column;
    border-radius: 14px;
  }
  .category-sidebar {
    width: 100%;
    min-width: unset;
    flex-direction: row;
    padding: 10px 16px;
    border-right: none;
    border-bottom: 1px solid var(--gray-200);
    overflow-x: auto;
    overflow-y: visible;
    flex-shrink: 0;
    background: var(--gray-50);
  }
  .category-sidebar-header {
    display: none;
  }
  .category-list {
    display: flex;
    gap: 4px;
    padding: 0;
    flex: 1;
    overflow-x: auto;
  }
  .category-item .cat-icon {
    font-size: 17px;
    max-width: 30px;
  }
  .category-item {
    padding: 3px 12px;
    font-size: 14px;
    gap: 4px;
    white-space: nowrap;
    margin-bottom: 0;
    flex-shrink: 0;
    border-radius: 30px;
  }
  .category-item.active {
    box-shadow: none;
    background: var(--primary);
    color: #fff;
  }
  .category-item.active .cat-badge {
    background: rgba(255, 255, 255, 0.3);
    color: #fff;
  }
  .category-item .cat-badge {
    display: none;
  }
  .product-list-area {
    max-height: 300px;
    min-height: 100px;
    padding: 14px 16px 10px 16px;
  }
  .resource-detail-area {
    padding: 14px 16px 16px 16px;
    min-height: 200px;
  }
  .product-grid {
    gap: 8px;
  }
  .product-card {
    font-size: 12px;
    padding: 6px 14px;
    max-width: 48%;
  }
}
@media (max-width: 500px) {
  body {
    padding: 10px;
  }
  .resource-section {
    border-radius: 10px;
  }
  .section-tab {
    padding: 6px 12px 8px 12px;
    font-size: 12px;
  }
  .section-tab .tab-count {
    font-size: 10px;
    padding: 0 6px;
  }
  .article-item {
    padding: 8px 12px;
    flex-wrap: wrap;
  }
  .article-item .a-title {
    font-size: 13px;
    white-space: normal;
  }
}