/* 基础重置 */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: system-ui, -apple-system, sans-serif; line-height: 1.6; color: #333; }
a { color: #0066cc; text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; display: block; }

/* 容器 */
.container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }
.narrow { max-width: 800px; }

/* 头部 */
header { background: #1a1a1a; color: #fff; padding: 1rem 0; }
header .container { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; }
header h1 { font-size: 1.5rem; }
header h1 a { color: #fff; text-decoration: none; }
header nav a { color: #fff; margin-left: 1.5rem; }
header nav a:hover { color: #0099ff; }

/* 底部 */
footer { background: #f5f5f5; padding: 2rem 0; margin-top: 4rem; text-align: center; }
footer p { margin: 0.5rem 0; font-size: 0.95rem; color: #666; }

/* 按钮 */
.btn, .btn-small { display: inline-block; padding: 0.75rem 1.5rem; background: #0066cc; color: #fff !important; border-radius: 4px; text-decoration: none; font-weight: 500; transition: background 0.2s; }
.btn:hover, .btn-small:hover { background: #0052a3; text-decoration: none; }
.btn-small { padding: 0.5rem 1rem; font-size: 0.9rem; }

/* 面包屑 */
.breadcrumb { padding: 1rem 0; font-size: 0.9rem; color: #666; }
.breadcrumb a { color: #0066cc; }

/* 首页 Hero */
.hero { text-align: center; padding: 3rem 0; }
.hero h1 { font-size: 2.5rem; margin-bottom: 1rem; }
.hero .certs { color: #0a0; margin: 1rem 0; font-weight: 500; }

/* 网格 */
.product-grid, .category-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1.5rem; margin: 2rem 0; }
.category-card { display: block; padding: 2rem; background: #f8f8f8; border-radius: 8px; text-align: center; transition: transform 0.2s, box-shadow 0.2s; }
.category-card:hover { transform: translateY(-4px); box-shadow: 0 4px 12px rgba(0,0,0,0.1); text-decoration: none; }

/* 产品卡片 */
.product-card { background: #fff; border: 1px solid #e0e0e0; border-radius: 8px; overflow: hidden; transition: box-shadow 0.2s; }
.product-card:hover { box-shadow: 0 4px 12px rgba(0,0,0,0.12); }
.card-img { aspect-ratio: 1; overflow: hidden; background: #f9f9f9; }
.card-img img { width: 100%; height: 100%; object-fit: cover; }
.product-card h3 { font-size: 1rem; margin: 1rem 1rem 0.5rem; min-height: 2.4em; }
.card-meta { font-size: 0.85rem; color: #666; margin: 0 1rem; }
.card-meta span::after { content: " • "; }
.card-meta span:last-child::after { content: ""; }
.card-certs { font-size: 0.8rem; color: #0a0; margin: 0.5rem 1rem; }
.product-card .btn-small { margin: 1rem; }

/* 产品详情 */
.product-top { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; margin: 2rem 0; }
.gallery-main img { width: 100%; border-radius: 8px; border: 1px solid #e0e0e0; }
.gallery-thumbs { display: grid; grid-template-columns: repeat(auto-fill, minmax(80px, 1fr)); gap: 0.5rem; margin-top: 1rem; }
.thumb { border: 2px solid transparent; border-radius: 4px; overflow: hidden; cursor: pointer; background: #fff; }
.thumb.active { border-color: #0066cc; }
.thumb img { width: 100%; aspect-ratio: 1; object-fit: cover; }
.product-info h1 { font-size: 1.8rem; margin-bottom: 1rem; }
.key-specs { list-style: none; margin: 1.5rem 0; }
.key-specs li { display: flex; justify-content: space-between; padding: 0.5rem 0; border-bottom: 1px solid #f0f0f0; }
.key-specs strong { font-weight: 600; color: #666; }
.cats a { display: inline-block; padding: 0.25rem 0.75rem; background: #f0f0f0; border-radius: 4px; margin: 0.25rem; font-size: 0.9rem; }
.product-body { margin: 3rem 0; }
.product-body h2 { margin-top: 2rem; }
.product-body table { width: 100%; border-collapse: collapse; margin: 1rem 0; }
.product-body th, .product-body td { border: 1px solid #e0e0e0; padding: 0.75rem; text-align: left; }
.product-body th { background: #f8f8f8; font-weight: 600; }
.related { margin: 3rem 0; }

/* 筛选栏 */
.filter-bar { display: flex; gap: 1rem; margin: 2rem 0; flex-wrap: wrap; }
#productSearch { flex: 1; min-width: 200px; padding: 0.75rem; border: 1px solid #ddd; border-radius: 4px; }
#catFilter { padding: 0.75rem; border: 1px solid #ddd; border-radius: 4px; }
#resultCount { align-self: center; color: #666; font-size: 0.9rem; }
.grid-item { transition: opacity 0.2s; }
.grid-item.hidden { display: none; }

/* 表单 */
form label { display: block; margin-top: 1rem; font-weight: 600; }
form input, form textarea, form select { width: 100%; padding: 0.75rem; margin-top: 0.25rem; border: 1px solid #ddd; border-radius: 4px; font-family: inherit; }
form button { margin-top: 1.5rem; }
.prose { line-height: 1.8; }
.prose h2 { margin-top: 2rem; }
.prose p { margin: 1rem 0; }

/* 响应式 */
@media (max-width: 768px) {
  .product-top { grid-template-columns: 1fr; }
  header .container { flex-direction: column; align-items: flex-start; }
  header nav { margin-top: 1rem; }
  header nav a { margin-left: 0; margin-right: 1rem; }
  .hero h1 { font-size: 1.8rem; }
  .product-grid, .category-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
  .post-item { grid-template-columns: 1fr; }
  .post-cover img { aspect-ratio: 16/9; }
}

/* ---------- Blog ---------- */
.lead-block { margin-bottom: 2rem; color: #555; }

.post-list { display: flex; flex-direction: column; gap: 2rem; margin: 2rem 0; }
.post-item { display: grid; grid-template-columns: 260px 1fr; gap: 1.5rem; padding-bottom: 2rem; border-bottom: 1px solid #eee; }
.post-item:last-child { border-bottom: none; }
.post-cover { display: block; border-radius: 8px; overflow: hidden; background: #f5f5f5; }
.post-cover img { width: 100%; aspect-ratio: 4/3; object-fit: cover; }
.post-body h2 { font-size: 1.35rem; margin-bottom: 0.35rem; }
.post-body h2 a { color: #1a1a1a; }
.post-meta { font-size: 0.85rem; color: #888; margin-bottom: 0.75rem; }
.post-summary { color: #555; margin-bottom: 1rem; }

.post { margin: 1rem 0 3rem; }
.post-header h1 { font-size: 2rem; line-height: 1.25; margin-bottom: 0.5rem; }
.post-cover-full { width: 100%; border-radius: 8px; margin: 1.5rem 0; }

.toc { background: #f8f8f8; border-left: 3px solid #0066cc; padding: 1rem 1.25rem; margin: 2rem 0; font-size: 0.92rem; }
.toc strong { display: block; margin-bottom: 0.5rem; }
.toc ul { margin: 0; padding-left: 1.1rem; }
.toc li { margin: 0.25rem 0; }

.prose h2 { margin-top: 2.5rem; font-size: 1.5rem; }
.prose h3 { margin-top: 1.75rem; font-size: 1.15rem; }
.prose ul, .prose ol { margin: 1rem 0 1rem 1.5rem; }
.prose li { margin: 0.4rem 0; }
.prose table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; font-size: 0.95rem; }
.prose th, .prose td { border: 1px solid #e0e0e0; padding: 0.65rem 0.75rem; text-align: left; }
.prose th { background: #f8f8f8; font-weight: 600; }
.prose blockquote { border-left: 3px solid #ddd; margin: 1.5rem 0; padding-left: 1rem; color: #666; }
.prose code { background: #f4f4f4; padding: 0.15em 0.4em; border-radius: 3px; font-size: 0.9em; }

.post-cta { background: #f8f8f8; border-radius: 8px; padding: 2rem; margin: 3rem 0; text-align: center; }
.post-cta h2 { margin-top: 0; }
.post-cta p { color: #555; margin-bottom: 1.25rem; }

.home-blog { margin: 4rem 0; }
.post-teasers { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.5rem; margin-top: 2rem; }
.post-teaser { border: 1px solid #e8e8e8; border-radius: 8px; padding: 1.5rem; }
.post-teaser h3 { font-size: 1.1rem; line-height: 1.35; margin-bottom: 0.4rem; }
.post-teaser h3 a { color: #1a1a1a; }
.post-teaser p { color: #555; font-size: 0.92rem; margin-bottom: 1rem; }

.page-list { list-style: none; }
.page-list li { padding: 0.5rem 0; border-bottom: 1px solid #f0f0f0; }