* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Microsoft YaHei', sans-serif; background: #f5f7fa; color: #333; }
.seo-layout { display: flex; min-height: calc(100vh - 52px); }
.seo-sidebar { width: 260px; background: white; border-right: 1px solid #e8e8e8; overflow-y: auto; flex-shrink: 0; padding: 10px 0; }
.seo-main { flex: 1; padding: 0 24px 30px; }
.breadcrumb { padding: 14px 0; font-size: 13px; color: #999; }
.breadcrumb a { color: #1890ff; text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb span { margin: 0 6px; color: #ccc; }
.category-hero { background: white; border-radius: 8px; padding: 24px; margin-bottom: 20px; display: flex; gap: 20px; align-items: center; }
.category-hero img { width: 180px; height: 130px; object-fit: cover; border-radius: 8px; flex-shrink: 0; }
.category-hero h2 { font-size: 20px; margin-bottom: 6px; }
.category-hero p { color: #666; line-height: 1.8; font-size: 14px; }
.section-title { font-size: 18px; font-weight: 600; margin: 24px 0 16px; padding-left: 10px; border-left: 3px solid #1890ff; }
.children-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 14px; margin-bottom: 30px; }
.children-card { background: white; border-radius: 8px; overflow: hidden; transition: all 0.2s; border: 1px solid #f0f0f0; text-decoration: none; color: inherit; display: block; }
.children-card:hover { box-shadow: 0 4px 16px rgba(0,0,0,.1); transform: translateY(-2px); }
.children-card img { width: 100%; height: 130px; object-fit: cover; }
.children-card .card-body { padding: 10px 12px; }
.children-card h3 { font-size: 14px; }
.model-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 14px; margin-bottom: 30px; }
.model-card { background: white; border-radius: 8px; overflow: hidden; transition: all 0.2s; border: 1px solid #f0f0f0; text-decoration: none; color: inherit; display: block; }
.model-card:hover { box-shadow: 0 4px 12px rgba(0,0,0,.1); border-color: #1890ff; }
.model-card img { width: 100%; height: 130px; object-fit: contain; padding: 8px; background: #fafafa; }
.model-card .card-info { padding: 8px 12px; border-top: 1px solid #f0f0f0; text-align: center; }
.model-card .card-info h4 { font-size: 13px; }
.model-card .card-btn { display: block; text-align: center; padding: 6px; background: #1890ff; color: white; font-size: 12px; border-radius: 0 0 8px 8px; }
.empty-tip { text-align: center; padding: 40px; color: #ccc; }
.seo-footer { text-align: center; padding: 24px; color: #999; font-size: 12px; border-top: 1px solid #eee; margin-top: 20px; }
/* 目录树 */
.tree-link { display: flex; align-items: center; gap: 4px; padding: 5px 8px; font-size: 13px; text-decoration: none; color: #333; transition: background 0.15s; }
.tree-link:hover { background: #f0f5ff; }
.tree-link.active { background: #e6f7ff; color: #1890ff; font-weight: 500; }
.tree-arrow { width: 14px; font-size: 8px; color: #999; flex-shrink: 0; text-align: center; cursor: pointer; }
.tree-icon { width: 40px; height: 30px; border-radius: 4px; overflow: hidden; flex-shrink: 0; background: #f5f5f5; }
.tree-icon img { width: 100%; height: 100%; object-fit: cover; }
.tree-text { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }