/* ==================== 全局样式 ==================== */
:root {
  --primary-color: #1890ff;
  --primary-hover: #40a9ff;
  --primary-light: #e6f7ff;
  --text-primary: #262626;
  --text-secondary: #595959;
  --text-tertiary: #8c8c8c;
  --bg-primary: #ffffff;
  --bg-secondary: #fafafa;
  --bg-tertiary: #f5f5f5;
  --border-color: #e8e8e8;
  --border-light: #f0f0f0;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --transition: all 0.3s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--bg-secondary);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ==================== 顶部导航 ==================== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 22px;
  font-weight: 600;
  font-family: 'Noto Serif SC', serif;
}

.logo-icon {
  color: var(--primary-color);
  font-size: 24px;
}

.nav {
  display: flex;
  gap: 32px;
}

.nav-link {
  position: relative;
  font-size: 15px;
  color: var(--text-secondary);
  transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-color);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary-color);
  border-radius: 2px;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-tertiary);
  border-radius: 20px;
  padding: 6px 16px;
  transition: var(--transition);
}

.search-box:focus-within {
  background: #fff;
  box-shadow: 0 0 0 2px var(--primary-color);
}

.search-box input {
  border: none;
  background: transparent;
  outline: none;
  font-size: 14px;
  width: 180px;
  color: var(--text-primary);
}

.search-box input::placeholder {
  color: var(--text-tertiary);
}

.search-btn {
  border: none;
  background: transparent;
  color: var(--text-tertiary);
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  transition: var(--transition);
}

.search-btn:hover {
  color: var(--primary-color);
}

/* ==================== 移动端导航 ==================== */
.mobile-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: #fff;
  border-top: 1px solid var(--border-light);
  padding: 8px 0;
  z-index: 100;
}

.mobile-nav-link {
  flex: 1;
  text-align: center;
  font-size: 12px;
  color: var(--text-tertiary);
  padding: 4px;
}

.mobile-nav-link.active {
  color: var(--primary-color);
}

/* ==================== 主体内容 ==================== */
.main {
  min-height: calc(100vh - 200px);
  padding: 32px 0 64px;
}

/* ==================== 精选轮播 ==================== */
.featured-section {
  margin-bottom: 48px;
}

.featured-carousel {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.featured-slides {
  display: flex;
  transition: transform 0.5s ease;
}

.featured-slide {
  min-width: 100%;
  position: relative;
  height: 400px;
}

.featured-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.featured-slide-content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 48px;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
  color: #fff;
}

.featured-slide-tag {
  display: inline-block;
  background: var(--primary-color);
  padding: 4px 12px;
  border-radius: 4px;
  font-size: 12px;
  margin-bottom: 12px;
}

.featured-slide-title {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 8px;
  font-family: 'Noto Serif SC', serif;
}

.featured-slide-desc {
  font-size: 14px;
  opacity: 0.9;
  max-width: 600px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.featured-dots {
  position: absolute;
  bottom: 16px;
  right: 24px;
  display: flex;
  gap: 8px;
}

.featured-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  cursor: pointer;
  transition: var(--transition);
}

.featured-dot.active {
  background: #fff;
  width: 24px;
  border-radius: 4px;
}

/* ==================== 区块标题 ==================== */
.section-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 24px;
  font-family: 'Noto Serif SC', serif;
}

.title-icon {
  font-size: 22px;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.view-more {
  color: var(--primary-color);
  font-size: 14px;
  transition: var(--transition);
}

.view-more:hover {
  color: var(--primary-hover);
}

/* ==================== 热门分类 ==================== */
.categories-section {
  margin-bottom: 48px;
}

.categories-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
}

.category-card {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 24px 16px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  cursor: pointer;
}

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.category-icon {
  font-size: 32px;
  margin-bottom: 12px;
}

.category-name {
  font-size: 15px;
  font-weight: 500;
  margin-bottom: 4px;
}

.category-count {
  font-size: 12px;
  color: var(--text-tertiary);
}

/* ==================== 文章列表 ==================== */
.articles-section {
  margin-bottom: 48px;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.article-card {
  background: #fff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  cursor: pointer;
  display: flex;
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.article-card-cover {
  width: 220px;
  min-height: 180px;
  overflow: hidden;
}

.article-card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.article-card:hover .article-card-cover img {
  transform: scale(1.05);
}

.article-card-content {
  flex: 1;
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.article-card-category {
  display: inline-block;
  color: var(--primary-color);
  font-size: 12px;
  margin-bottom: 8px;
}

.article-card-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
  font-family: 'Noto Serif SC', serif;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.5;
}

.article-card-summary {
  font-size: 13px;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
  margin-bottom: 12px;
}

.article-card-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 12px;
  color: var(--text-tertiary);
}

.article-card-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.article-card-tags {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.article-tag {
  font-size: 11px;
  padding: 2px 8px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  color: var(--text-secondary);
}

.load-more-box {
  text-align: center;
  margin-top: 32px;
}

.load-more-btn {
  padding: 12px 48px;
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: 24px;
  font-size: 14px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.load-more-btn:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

/* ==================== 热门标签 ==================== */
.tags-section {
  margin-bottom: 48px;
}

.tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.tag-item {
  padding: 8px 16px;
  background: #fff;
  border-radius: 20px;
  font-size: 14px;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  cursor: pointer;
}

.tag-item:hover {
  background: var(--primary-color);
  color: #fff;
  transform: translateY(-2px);
}

/* ==================== 精选商品 ==================== */
.products-section {
  margin-bottom: 48px;
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.product-card {
  background: #fff;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  cursor: pointer;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.product-card-image {
  position: relative;
  padding-top: 100%;
  overflow: hidden;
}

.product-card-image img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-card-platform {
  position: absolute;
  top: 8px;
  left: 8px;
  padding: 2px 8px;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  font-size: 10px;
  border-radius: 4px;
  text-transform: uppercase;
}

.product-card-content {
  padding: 12px;
}

.product-card-title {
  font-size: 13px;
  font-weight: 500;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 8px;
  line-height: 1.4;
}

.product-card-price {
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.price-current {
  font-size: 18px;
  font-weight: 600;
  color: #ff4d4f;
}

.price-original {
  font-size: 12px;
  color: var(--text-tertiary);
  text-decoration: line-through;
}

/* ==================== 返回顶部 ==================== */
.back-to-top {
  position: fixed;
  bottom: 100px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #fff;
  border: none;
  box-shadow: var(--shadow-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 99;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--primary-color);
  color: #fff;
}

/* ==================== 骨架屏 ==================== */
.skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ==================== 页脚 ==================== */
.footer {
  background: #1a1a2e;
  color: rgba(255, 255, 255, 0.8);
  padding: 48px 0 24px;
}

.footer-content {
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
  font-family: 'Noto Serif SC', serif;
}

.footer-desc {
  font-size: 14px;
  margin-bottom: 24px;
  color: rgba(255, 255, 255, 0.6);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-bottom: 24px;
}

.footer-links a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  transition: var(--transition);
}

.footer-links a:hover {
  color: #fff;
}

.footer-copyright {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.4);
}

/* ==================== 响应式 ==================== */
@media (max-width: 1024px) {
  .categories-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .products-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .header .container {
    height: 56px;
  }
  
  .nav {
    display: none;
  }
  
  .search-box {
    display: none;
  }
  
  .mobile-nav {
    display: flex;
  }
  
  .main {
    padding-bottom: 80px;
  }
  
  .featured-slide {
    height: 280px;
  }
  
  .featured-slide-content {
    padding: 24px;
  }
  
  .featured-slide-title {
    font-size: 20px;
  }
  
  .categories-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
  }
  
  .category-card {
    padding: 16px 12px;
  }
  
  .category-icon {
    font-size: 24px;
  }
  
  .articles-grid {
    grid-template-columns: 1fr;
  }
  
  .article-card {
    flex-direction: column;
  }
  
  .article-card-cover {
    width: 100%;
    height: 180px;
  }
  
  .products-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  
  .back-to-top {
    bottom: 80px;
    right: 16px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  
  .logo {
    font-size: 18px;
  }
  
  .section-title {
    font-size: 18px;
  }
  
  .categories-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .article-card-title {
    font-size: 15px;
  }
  
  .tags-cloud {
    gap: 8px;
  }
  
  .tag-item {
    padding: 6px 12px;
    font-size: 12px;
  }
}