/* ============================================
   CSS变量定义
   ============================================ */
:root {
  /* 主题色 - 蓝绿色系 */
  --color-primary: #6aada7;
  --color-primary-dark: #00796B;
  --color-primary-light: #B2DFDB;

  /* 强调色 - 珊瑚红 */
  --color-accent: #07C160;
  --color-accent-hover: #06AD56;

  /* 中性色 */
  --color-bg: #F7F9FC;
  --color-surface: #FFFFFF;
  --color-text: #2C3E50;
  --color-text-secondary: #7F8C8D;
  --color-border: #E1E8ED;

  /* 间距系统 */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;

  /* 圆角 */
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-2xl: 16px;
  --radius-full: 9999px;

  /* 阴影 */
  --shadow-xs: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);

  /* 容器 */
  --container-max-width: 1400px;
  --header-height: 70px;
}

/* ============================================
   全局样式重置
   ============================================ */
* {
  padding: 0;
  margin: 0;
  border: 0;
  list-style: none;
  outline: none;
  box-sizing: border-box;
}

html, body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  margin: 0;
  padding: 0;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-primary);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.clearfix::after {
  content: "";
  display: table;
  clear: both;
}

/* ============================================
   容器系统
   ============================================ */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* ============================================
   顶部导航栏
   ============================================ */
.site-header {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-inner {
  display: flex;
  align-items: center;
  height: var(--header-height);
  gap: var(--spacing-xl);
}

.brand-section {
  flex-shrink: 0;
}

.brand-link {
  display: block;
}

.brand-link img {
  height: 50px;
  width: auto;
}

.main-nav {
  flex: 1;
}

.nav-list {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xs);
}

.nav-item {
  position: relative;
}

.nav-item a {
  display: block;
  padding: 0 var(--spacing-md);
  color: rgba(255, 255, 255, 0.9);
  font-size: 16px;
  font-weight: 500;
  height: var(--header-height);
  line-height: var(--header-height);
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
}

.nav-item a:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #ffffff;
}

.nav-item-active a {
  background: rgba(255, 255, 255, 0.2);
  color: #ffffff;
  font-weight: 600;
}

.search-section {
  width: 320px;
  flex-shrink: 0;
}

.search-form {
  display: flex;
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  padding: var(--spacing-xs);
  position: relative;
}

.search-type-box {
  position: absolute;
  left: var(--spacing-sm);
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
}

.search-type-select {
  background: rgba(255, 255, 255, 0.95);
  border: none;
  color: var(--color-text);
  font-size: 13px;
  padding: 0 var(--spacing-md) 0 var(--spacing-sm);
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  height: 28px;
  border-radius: var(--radius-full) 0 0 var(--radius-full);
}

.search-type-select option {
  background: var(--color-surface);
  color: var(--color-text);
}

.search-input {
  flex: 1;
  background: rgba(255, 255, 255, 0.95);
  border: none;
  border-radius: var(--radius-full) 0 0 var(--radius-full);
  padding: 0 45px 0 75px;
  height: 32px;
  font-size: 14px;
  color: var(--color-text);
}

.search-input::placeholder {
  color: #999999;
}

.search-submit {
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  background: var(--color-surface);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.search-submit:hover {
  background: var(--color-bg);
}

.search-icon {
  display: block;
  width: 16px;
  height: 16px;
  background: var(--color-primary);
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230009688' stroke-width='2'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cline x1='16.5' y1='16.5' x2='22' y2='22'/%3E%3C/svg%3E");
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230009688' stroke-width='2'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cline x1='16.5' y1='16.5' x2='22' y2='22'/%3E%3C/svg%3E");
  mask-size: 16px 16px;
  -webkit-mask-size: 16px 16px;
  mask-repeat: no-repeat;
  -webkit-mask-repeat: no-repeat;
  mask-position: center;
  -webkit-mask-position: center;
}

/* ============================================
   面包屑导航
   ============================================ */
.breadcrumb-nav {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  height: 45px;
  flex-wrap: wrap;
}

.breadcrumb-item {
  display: flex;
  align-items: center;
}

.breadcrumb-label {
  color: var(--color-text-secondary);
  font-size: 14px;
  margin-right: var(--spacing-sm);
}

.breadcrumb-item a {
  color: var(--color-text-secondary);
  font-size: 14px;
  transition: color 0.2s ease;
}

.breadcrumb-item a:hover {
  color: var(--color-primary);
}

.breadcrumb-separator {
  margin: 0 var(--spacing-sm);
  color: var(--color-border);
}

/* ============================================
   主内容区域
   ============================================ */
.main-content {
  padding: var(--spacing-xl) 0;
  min-height: calc(100vh - var(--header-height) - 200px);
}

/* ============================================
   页脚
   ============================================ */
.site-footer {
  background: var(--color-text);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--spacing-2px) 0 var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
}

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

.footer-brand-link {
  display: inline-block;
  margin-bottom: var(--spacing-sm);
}

.footer-brand-link img {
  height: 40px;
  width: auto;
}

.footer-slogan {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.5);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-md);
}

.footer-links a {
  color: rgba(255, 255, 255, 0.6);
  font-size: 14px;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
}

.footer-links a:hover {
  color: var(--color-primary);
  background: rgba(255, 255, 255, 0.1);
}

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

.footer-copyright p {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.4);
  margin-bottom: var(--spacing-xs);
}

.footer-copyright a {
  color: rgba(255, 255, 255, 0.4);
  transition: color 0.2s ease;
}

.footer-copyright a:hover {
  color: var(--color-primary);
}

/* ============================================
   返回顶部按钮
   ============================================ */
.back-to-top {
  position: fixed;
  right: 30px;
  bottom: 30px;
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  border-radius: 50%;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s ease;
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 32px rgba(0, 150, 136, 0.4);
}

.back-to-top::before {
  content: "↑";
  display: block;
  width: 100%;
  height: 100%;
  color: white;
  font-size: 20px;
  font-weight: bold;
  text-align: center;
  line-height: 50px;
}

/* ============================================
   首页布局
   ============================================ */
.home-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2xl);
}

.home-section {
  background: var(--color-surface);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.ranking-row-wrapper {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.ranking-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
}

.ranking-row .home-section {
  min-width: 700px;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg) var(--spacing-xl);
  border-bottom: 1px solid var(--color-border);
}

.section-header__title {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.section-icon {
  font-size: 24px;
}

.section-header__more {
  font-size: 14px;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  transition: all 0.2s ease;
}

.section-header__more:hover {
  color: var(--color-primary-dark);
  transform: translateX(4px);
}

/* ============================================
   应用网格系统
   ============================================ */
.app-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--spacing-lg);
  padding: var(--spacing-xl);
}

.app-grid--featured {
  grid-template-columns: repeat(5, 1fr);
}

/* ============================================
   首页资讯区块
   ============================================ */
.home-section--news {
  background: var(--color-surface);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
  padding: var(--spacing-xl);
  padding-bottom: 0;
}

.news-featured-card {
  display: block;
  border-radius: var(--radius-xl);
  overflow: hidden;
  text-decoration: none;
  background: var(--color-bg);
  transition: all 0.3s ease;
}

.news-featured-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.news-featured-card__image {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--color-border);
}

.news-featured-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.news-featured-card:hover .news-featured-card__image img {
  transform: scale(1.05);
}

.news-featured-card__body {
  padding: var(--spacing-md);
}

.news-featured-card__title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.5;
  margin: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.news-list {
  list-style: none;
  padding: var(--spacing-lg) var(--spacing-xl);
  margin: 0;
}

.news-list-item {
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--color-border);
}

.news-list-item:last-child {
  border-bottom: none;
}

.news-list-item__link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  text-decoration: none;
  color: var(--color-text);
  transition: color 0.2s;
}

.news-list-item__link:hover {
  color: var(--color-primary);
}

.news-list-item__dot {
  font-size: 6px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.news-list-item__title {
  font-size: 14px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ============================================
   应用卡片
   ============================================ */
.app-card {
  background: var(--color-bg);
  border-radius: var(--radius-xl);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
}

.app-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  background: var(--color-surface);
}

.app-card__inner {
  display: flex;
  flex-direction: column;
  padding: var(--spacing-lg);
  height: 100%;
  text-decoration: none;
}

.app-card__icon-wrapper {
  width: 90px;
  height: 90px;
  margin: 0 auto var(--spacing-md);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.app-card__icon {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.app-card__title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 var(--spacing-sm);
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.app-card__category {
  font-size: 13px;
  color: var(--color-primary);
  text-align: center;
  display: block;
  margin-bottom: var(--spacing-xs);
}

.app-card__date {
  font-size: 11px;
  color: var(--color-text-secondary);
  text-align: center;
  display: block;
  margin-bottom: var(--spacing-md);
}

.app-card__download {
  margin-top: auto;
  background: var(--color-accent);
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: var(--radius-full);
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
  transition: background 0.2s;
  width: 100%;
}

.app-card__download:hover {
  background: var(--color-accent-hover);
}

/* ============================================
   排行榜
   ============================================ */
.ranking-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  padding: var(--spacing-xl);
}

.ranking-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--color-bg);
  border-radius: var(--radius-xl);
  transition: all 0.2s ease;
}

.ranking-item:hover {
  background: var(--color-surface);
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.ranking-item__number {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  font-weight: 700;
  font-size: 18px;
  border-radius: var(--radius-lg);
  flex-shrink: 0;
}

.ranking-item--rank-1 .ranking-item__number {
  background: linear-gradient(135deg, #FFD700 0%, #FFA500 100%);
  color: #8B4513;
}

.ranking-item--rank-2 .ranking-item__number {
  background: linear-gradient(135deg, #E0E0E0 0%, #BDBDBD 100%);
  color: #424242;
}

.ranking-item--rank-3 .ranking-item__number {
  background: linear-gradient(135deg, #CD7F32 0%, #A0522D 100%);
  color: #FFF;
}

.ranking-item__icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  flex-shrink: 0;
}

.ranking-item__icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.ranking-item__content {
  flex: 1;
  min-width: 0;
}

.ranking-item__title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 var(--spacing-xs);
}

.ranking-item__title a {
  color: inherit;
  text-decoration: none;
}

.ranking-item__title a:hover {
  color: var(--color-primary);
}

.ranking-item__category {
  font-size: 12px;
  color: var(--color-text-secondary);
}

.ranking-item__download {
  padding: 8px 20px;
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 600;
  transition: background 0.2s;
}

.ranking-item__download:hover {
  background: var(--color-primary-dark);
}

/* ============================================
   分类筛选
   ============================================ */
.category-filter {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--spacing-xl);
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
}

.filter-item {
  display: block;
  padding: 8px 20px;
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 14px;
  border-radius: var(--radius-full);
  transition: all 0.2s ease;
}

.filter-item:hover {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
}

.filter-item--active {
  background: var(--color-primary);
  color: white;
}

.filter-item--active:hover {
  background: var(--color-primary-dark);
  color: white;
}

/* ============================================
   产品列表页
   ============================================ */
.product-list-section {
  background: var(--color-surface);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.page-header {
  padding: var(--spacing-xl) var(--spacing-xl) var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.page-header__title {
  font-size: 24px;
  font-weight: 600;
  color: var(--color-text);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-lg);
  padding: var(--spacing-xl);
}

.product-card {
  background: var(--color-bg);
  border-radius: var(--radius-xl);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
}

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

.product-card__inner {
  display: flex;
  flex-direction: column;
  padding: var(--spacing-lg);
  height: 100%;
  text-decoration: none;
}

.product-card__icon-wrapper {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--spacing-md);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.product-card__icon {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-card__title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 var(--spacing-sm);
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.product-card__meta {
  text-align: center;
  margin-bottom: var(--spacing-md);
}

.product-card__category {
  font-size: 12px;
  color: var(--color-primary);
  display: inline-block;
  margin-right: var(--spacing-sm);
}

.product-card__date {
  font-size: 11px;
  color: var(--color-text-secondary);
}

.product-card__download {
  margin-top: auto;
  background: var(--color-accent);
  color: white;
  border: none;
  padding: 8px 16px;
  border-radius: var(--radius-full);
  cursor: pointer;
  font-weight: 600;
  font-size: 13px;
  transition: background 0.2s;
  width: 100%;
}

.product-card__download:hover {
  background: var(--color-accent-hover);
}

/* ============================================
   分页
   ============================================ */
/* ============================================
   分页样式
   ============================================ */
.pagination-wrapper {
  padding: var(--spacing-xl);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.pagination-wrapper .pagination,
.pagination-wrapper ul {
  display: contents;
  margin: 0;
  padding: 0;
  list-style: none;
}

.pagination-wrapper li {
  display: contents;
}

.pagination-wrapper a,
.pagination-wrapper span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 16px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.pagination-wrapper a:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-surface);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.pagination-wrapper .current,
.pagination-wrapper .active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
}

/* ============================================
   产品详情页
   ============================================ */
.product-detail-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

.product-header {
  display: flex;
  gap: var(--spacing-xl);
  padding: var(--spacing-xl);
  background: var(--color-surface);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-sm);
}

.product-header__icon {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  flex-shrink: 0;
  box-shadow: var(--shadow-md);
}

.product-header__icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-header__info {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.product-header__title {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-text);
  margin: 0 0 var(--spacing-md);
}

.product-header__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
}

.meta-item {
  display: flex;
  align-items: center;
}

.meta-label {
  color: var(--color-text-secondary);
  margin-right: var(--spacing-xs);
}

.meta-value {
  color: var(--color-text);
  font-weight: 500;
}

.product-header__action {
  display: flex;
  align-items: center;
}

.download-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 140px;
  height: 140px;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
  border-radius: var(--radius-2xl);
  color: white;
  text-decoration: none;
  box-shadow: var(--shadow-lg);
  transition: all 0.3s ease;
}

.download-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 12px 32px rgba(7, 193, 96, 0.4);
}

.download-btn__icon {
  font-size: 32px;
  margin-bottom: var(--spacing-sm);
}

.download-btn__text {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
}

.download-btn__size {
  font-size: 12px;
  opacity: 0.9;
}

/* 内容导航 */
.content-nav {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  background: var(--color-bg);
  padding: var(--spacing-sm);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
}

.content-nav-item {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: all 0.2s ease;
}

.content-nav-item:hover {
  background: var(--color-surface);
}

.content-nav-item--active {
  background: var(--color-primary);
  color: white;
}

/* 详情区块 */
.detail-section {
  background: var(--color-surface);
  border-radius: var(--radius-2xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-sm);
}

.detail-section__header {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

.detail-section__title {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text);
  margin: 0;
}

/* 截图画廊 */
.screenshots-gallery {
  overflow-x: auto;
}

.screenshots-scroll {
  display: flex;
  gap: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
}

.screenshot-item {
  flex-shrink: 0;
  width: 240px;
  height: 430px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.screenshot-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 介绍内容 */
.description-content {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
}

.description-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  margin: var(--spacing-md) auto;
  box-shadow: var(--shadow-sm);
}

.description-content p {
  margin-bottom: var(--spacing-md);
  text-indent: 2em;
}

.description-content h3 {
  font-size: 18px;
  font-weight: 600;
  margin: var(--spacing-xl) 0 var(--spacing-md);
  color: var(--color-text);
}

/* 信息表格 */
.info-table {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.info-row {
  display: flex;
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--color-border);
}

.info-row:last-child {
  border-bottom: none;
}

.info-label {
  width: 120px;
  color: var(--color-text-secondary);
  flex-shrink: 0;
}

.info-value {
  flex: 1;
  color: var(--color-text);
  font-weight: 500;
}

/* 推荐区块 */
.recommendation-section {
  margin-top: var(--spacing-lg);
}

.recommendation-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

.recommendation-block {
  background: var(--color-surface);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.recommendation-header {
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.recommendation-header__title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin: 0;
}

.mini-app-list {
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.mini-app-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-sm);
  border-radius: var(--radius-lg);
  transition: background 0.2s;
  text-decoration: none;
}

.mini-app-item:hover {
  background: var(--color-bg);
}

.mini-app-item__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  flex-shrink: 0;
}

.mini-app-item__icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.mini-app-item__content {
  flex: 1;
}

.mini-app-item__title {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  margin: 0 0 var(--spacing-xs);
}

.mini-app-item__category {
  font-size: 11px;
  color: var(--color-text-secondary);
}

/* ============================================
   文章列表页
   ============================================ */
.article-list-section {
  background: var(--color-surface);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
  padding: var(--spacing-xl);
}

.article-card {
  background: var(--color-bg);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all 0.3s ease;
}

.article-card:hover {
  background: var(--color-surface);
  box-shadow: var(--shadow-md);
}

.article-card__inner {
  display: flex;
  text-decoration: none;
}

.article-card__thumb {
  width: 200px;
  height: 140px;
  flex-shrink: 0;
}

.article-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-card__content {
  flex: 1;
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.article-card__title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 var(--spacing-sm);
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.article-card__excerpt {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.article-card__meta {
  margin-top: auto;
}

.article-card__date {
  font-size: 12px;
  color: var(--color-text-secondary);
}

/* ============================================
   文章详情页
   ============================================ */
.article-detail {
  background: var(--color-surface);
  border-radius: var(--radius-2xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-sm);
}

.article-header {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.article-header__title {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-text);
  margin: 0 0 var(--spacing-md);
  line-height: 1.4;
}

.article-header__meta {
  display: flex;
  gap: var(--spacing-lg);
}

.meta-icon {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.article-content {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
}

.article-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  margin: var(--spacing-md) auto;
  box-shadow: var(--shadow-sm);
}

.article-content p {
  margin-bottom: var(--spacing-md);
  text-indent: 2em;
}

.article-content h3 {
  font-size: 18px;
  font-weight: 600;
  margin: var(--spacing-xl) 0 var(--spacing-md);
}

/* 相关应用 */
.related-section {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--color-border);
}

.related-header {
  margin-bottom: var(--spacing-lg);
}

.related-header__title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin: 0;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-md);
}

.related-app-card {
  display: block;
  padding: var(--spacing-md);
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: all 0.2s ease;
  text-decoration: none;
}

.related-app-card:hover {
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.related-app-card__icon {
  width: 50px;
  height: 50px;
  margin: 0 auto var(--spacing-sm);
  border-radius: var(--radius-md);
}

.related-app-card__icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.related-app-card__title {
  font-size: 12px;
  font-weight: 500;
  color: var(--color-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ============================================
   404页面
   ============================================ */
.error-page {
  text-align: center;
  padding: 100px 20px;
}

.error-code {
  font-size: 120px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-lg);
  line-height: 1;
}

.error-title {
  font-size: 28px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
}

.error-message {
  font-size: 16px;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
}

.error-actions {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-2xl);
}

.btn {
  display: inline-block;
  padding: 12px 32px;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: all 0.2s ease;
}

.btn--primary {
  background: var(--color-primary);
  color: white;
}

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

.btn--secondary {
  background: var(--color-bg);
  color: var(--color-text);
}

.btn--secondary:hover {
  background: var(--color-border);
}

.error-links {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  display: inline-block;
}

.error-links h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 var(--spacing-md);
}

.quick-links {
  display: flex;
  gap: var(--spacing-sm);
}

.quick-links a {
  padding: 8px 16px;
  background: var(--color-bg);
  color: var(--color-text);
  border-radius: var(--radius-md);
  font-size: 14px;
  transition: all 0.2s ease;
}

.quick-links a:hover {
  background: var(--color-primary);
  color: white;
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1200px) {
  .app-grid,
  .app-grid--featured {
    grid-template-columns: repeat(4, 1fr);
  }

  .product-grid,
  .article-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .related-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 900px) {
  .header-inner {
    flex-wrap: wrap;
    height: auto;
    padding: var(--spacing-md) 0;
  }

  .main-nav {
    order: 3;
    width: 100%;
    margin-top: var(--spacing-md);
  }

  .nav-list {
    overflow-x: auto;
    white-space: nowrap;
  }

  .search-section {
    width: 100%;
    order: 2;
  }

  .product-grid,
  .article-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .app-grid,
  .app-grid--featured {
    grid-template-columns: repeat(3, 1fr);
  }

  .topic-banner-card__title {
    font-size: 16px;
  }

  .product-header {
    flex-direction: column;
    text-align: center;
  }

  .product-header__meta {
    justify-content: center;
  }

  .recommendation-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   文章上下篇 & 相关资讯
   ============================================ */
.article-nav-row {
  display: flex;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--color-border);
  margin-top: var(--spacing-lg);
}

.article-nav-link {
  flex: 1;
  display: block;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--color-bg);
  border-radius: var(--radius-xl);
  text-decoration: none;
  transition: all 0.2s ease;
  min-width: 0;
}

.article-nav-link:hover {
  background: var(--color-primary-light);
}

.article-nav-link__label {
  display: block;
  font-size: 12px;
  color: var(--color-primary);
  margin-bottom: var(--spacing-xs);
}

.article-nav-link__title {
  display: block;
  font-size: 14px;
  color: var(--color-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.article-nav-link--next {
  text-align: right;
}

.article-related-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.article-related-list__item {
  border-bottom: 1px solid var(--color-border);
}

.article-related-list__item:last-child {
  border-bottom: none;
}

.article-related-list__link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) 0;
  text-decoration: none;
  color: var(--color-text);
  transition: color 0.2s;
}

.article-related-list__link:hover {
  color: var(--color-primary);
}

.article-related-list__dot {
  font-size: 6px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.article-related-list__title {
  flex: 1;
  font-size: 14px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

.article-related-list__date {
  font-size: 12px;
  color: var(--color-text-secondary);
  flex-shrink: 0;
}

/* ============================================
   专题模块
   ============================================ */

/* 专题列表页 */
.topic-list-section {
    background: var(--color-surface);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.topic-banner-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    padding: 0 var(--spacing-xl) var(--spacing-xl);
}

.topic-banner-card {
    position: relative;
    display: block;
    border-radius: var(--radius-xl);
    overflow: hidden;
    text-decoration: none;
    aspect-ratio: 16 / 9;
}

.topic-banner-card__image {
    position: absolute;
    inset: 0;
    background: var(--color-border);
}

.topic-banner-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.topic-banner-card:hover .topic-banner-card__image img {
    transform: scale(1.08);
}

.topic-banner-card__overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        0deg,
        rgba(0, 0, 0, 0.7) 0%,
        rgba(0, 0, 0, 0.1) 50%,
        rgba(0, 0, 0, 0.05) 100%
    );
    transition: background 0.3s ease;
}

.topic-banner-card:hover .topic-banner-card__overlay {
    background: linear-gradient(
        0deg,
        rgba(0, 150, 136, 0.85) 0%,
        rgba(0, 150, 136, 0.2) 50%,
        rgba(0, 0, 0, 0.05) 100%
    );
}

.topic-banner-card__body {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-lg);
    z-index: 1;
}

.topic-banner-card__title {
    font-size: 20px;
    font-weight: 700;
    color: #ffffff;
    margin: 0 0 var(--spacing-sm);
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.topic-banner-card__date {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.8);
}

/* 专题详情页 */
.topic-hero-banner {
    position: relative;
    min-height: 320px;
    display: flex;
    align-items: center;
    overflow: hidden;
    margin-bottom: var(--spacing-xl);
}

.topic-hero-banner__bg {
    position: absolute;
    inset: 0;
    background: var(--color-border);
}

.topic-hero-banner__bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.topic-hero-banner__mask {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        rgba(0, 150, 136, 0.88) 0%,
        rgba(0, 121, 107, 0.75) 100%
    );
}

.topic-hero-banner__content {
    position: relative;
    z-index: 1;
    padding: var(--spacing-2xl) 0;
}

.topic-hero-banner__title {
    font-size: 32px;
    font-weight: 700;
    color: #ffffff;
    margin: 0 0 var(--spacing-md);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.topic-hero-banner__date {
    display: inline-block;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-md);
}

.topic-hero-banner__desc {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.85);
    line-height: 1.8;
    max-width: 700px;
}

.topic-app-section {
    background: var(--color-surface);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

@media (max-width: 600px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  .app-grid,
  .product-grid,
  .article-grid,
  .topic-banner-grid {
    grid-template-columns: 1fr;
  }

  .topic-hero-banner {
    min-height: 220px;
  }

  .topic-hero-banner__title {
    font-size: 22px;
  }

  .related-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }
}