/* 全局样式 */
:root {
  --primary-color: #2c3e50;
  --secondary-color: #3498db;
  --accent-color: #e74c3c;
  --light-color: #ecf0f1;
  --dark-color: #2c3e50;
  --text-color: #333;
  --light-text: #fff;
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
body {
  background-color: #f9f9f9;
  color: var(--text-color);
  line-height: 1.6;
}
a {
  text-decoration: none;
  color: var(--secondary-color);
  transition: color 0.3s;
}
a:hover {
  color: var(--accent-color);
}
.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
}
.btn {
  display: inline-block;
  padding: 10px 20px;
  background-color: var(--secondary-color);
  color: white;
  border-radius: 4px;
  font-weight: 600;
  transition: all 0.3s;
  border: none;
  cursor: pointer;
}
.btn:hover {
  background-color: #2980b9;
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}
.btn-accent {
  background-color: var(--accent-color);
}
.btn-accent:hover {
  background-color: #c0392b;
}
.btn-outline {
  background-color: transparent;
  border: 2px solid var(--secondary-color);
  color: var(--secondary-color);
}
.btn-outline:hover {
  background-color: var(--secondary-color);
  color: white;
}
section {
  padding: 80px 0;
}
.section-title {
  text-align: center;
  margin-bottom: 50px;
  position: relative;
}
.section-title h2 {
  font-size: 2.5rem;
  color: var(--primary-color);
  margin-bottom: 15px;
}
.section-title p {
  color: #666;
  max-width: 700px;
  margin: 0 auto;
}
.section-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 3px;
  background-color: var(--secondary-color);
  margin: 20px auto;
}

/* 导航栏样式 */
header {
  background-color: var(--primary-color);
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
  z-index: 1000;
}
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
}
.logo {
  color: var(--light-text);
  font-size: 1.8rem;
  font-weight: 700;
}
.logo span {
  color: var(--secondary-color);
}
.nav-links {
  display: flex;
  list-style: none;
}
.nav-links li {
  margin-left: 30px;
}
.nav-links a {
  color: var(--light-text);
  font-weight: 500;
}
.nav-links a:hover {
  color: var(--secondary-color);
}
.mobile-menu {
  display: none;
  font-size: 1.5rem;
  color: white;
  cursor: pointer;
}

/* 面包屑导航 */
.breadcrumb {
  padding: 15px 0;
  background-color: #f5f5f5;
  font-size: 0.9rem;
}
.breadcrumb a {
  color: #666;
}
.breadcrumb a:hover {
  color: var(--secondary-color);
}
.breadcrumb span {
  color: #999;
  margin: 0 5px;
}

/* 页面内容布局 */
.page-content {
  display: flex;
  gap: 40px;
  margin-top: 40px;
}
.main-content {
  flex: 1;
}
.sidebar {
  width: 300px;
}

/* 教程分类筛选 */
.category-filter {
  background-color: white;
  border-radius: 8px;
  padding: 25px;
  margin-bottom: 30px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}
.category-filter h3 {
  margin-bottom: 20px;
  color: var(--primary-color);
  font-size: 1.3rem;
}
.filter-options {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.filter-btn {
  padding: 8px 16px;
  background-color: #f1f1f1;
  border-radius: 20px;
  font-size: 0.9rem;
  transition: all 0.3s;
  cursor: pointer;
}
.filter-btn:hover,
.filter-btn.active {
  background-color: var(--secondary-color);
  color: white;
}

/* 教程资源网格 */
.learning-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 30px;
}
.learning-card {
  background-color: white;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
  transition: transform 0.3s, box-shadow 0.3s;
}
.learning-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0,0,0,0.1);
}
.card-img {
  height: 180px;
  background-color: var(--secondary-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 2.5rem;
}
.card-content {
  padding: 25px;
}
.card-content h3 {
  margin-bottom: 15px;
  color: var(--primary-color);
  font-size: 1.3rem;
}
.card-content p {
  color: #666;
  margin-bottom: 20px;
  font-size: 0.95rem;
}
.card-meta {
  display: flex;
  justify-content: space-between;
  color: #999;
  font-size: 0.85rem;
  margin-bottom: 15px;
}

/* 侧边栏样式 */
.sidebar-widget {
  background-color: white;
  border-radius: 8px;
  padding: 25px;
  margin-bottom: 30px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}
.sidebar-widget h3 {
  margin-bottom: 20px;
  color: var(--primary-color);
  font-size: 1.3rem;
  position: relative;
  padding-bottom: 10px;
}
.sidebar-widget h3::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 40px;
  height: 2px;
  background-color: var(--secondary-color);
}
.popular-list {
  list-style: none;
}
.popular-list li {
  margin-bottom: 15px;
  padding-bottom: 15px;
  border-bottom: 1px solid #f1f1f1;
}
.popular-list li:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}
.popular-list a {
  display: flex;
  align-items: center;
  color: var(--text-color);
}
.popular-list a:hover {
  color: var(--secondary-color);
}
.popular-list .popular-img {
  width: 60px;
  height: 60px;
  background-color: #f1f1f1;
  border-radius: 4px;
  margin-right: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--secondary-color);
  font-size: 1.5rem;
}
.popular-list .popular-content h4 {
  font-size: 0.95rem;
  margin-bottom: 5px;
}
.popular-list .popular-content .date {
  font-size: 0.8rem;
  color: #999;
}
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.tag {
  padding: 6px 12px;
  background-color: #f1f1f1;
  border-radius: 4px;
  font-size: 0.85rem;
  transition: all 0.3s;
}
.tag:hover {
  background-color: var(--secondary-color);
  color: white;
}

/* 分页样式 */
.pagination {
  display: flex;
  justify-content: center;
  margin-top: 50px;
}
.pagination a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin: 0 5px;
  border-radius: 4px;
  background-color: white;
  color: var(--text-color);
  box-shadow: 0 2px 5px rgba(0,0,0,0.05);
  transition: all 0.3s;
}
.pagination a:hover,
.pagination a.active {
  background-color: var(--secondary-color);
  color: white;
}

/* 文章详情页样式 */
.article-header {
  background-color: white;
  border-radius: 8px;
  padding: 40px;
  margin-bottom: 30px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
  text-align: center;
}
.article-header h1 {
  font-size: 2.2rem;
  color: var(--primary-color);
  margin-bottom: 20px;
  line-height: 1.3;
}
.article-meta {
  display: flex;
  justify-content: center;
  gap: 20px;
  color: #999;
  font-size: 0.9rem;
  margin-bottom: 20px;
}
.article-content {
  background-color: white;
  border-radius: 8px;
  padding: 40px;
  margin-bottom: 30px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}
.article-content h2 {
  color: var(--primary-color);
  margin: 30px 0 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid #f1f1f1;
}
.article-content h3 {
  color: var(--primary-color);
  margin: 25px 0 15px;
}
.article-content p {
  margin-bottom: 20px;
}
.article-content ul,
.article-content ol {
  margin-bottom: 20px;
  padding-left: 20px;
}
.article-content li {
  margin-bottom: 10px;
}
.code-block {
  background-color: #2d2d2d;
  color: #f8f8f2;
  padding: 20px;
  border-radius: 4px;
  margin: 20px 0;
  overflow-x: auto;
  font-family: 'Courier New', monospace;
}
.note-box {
  background-color: #e8f4fd;
  border-left: 4px solid var(--secondary-color);
  padding: 20px;
  margin: 20px 0;
  border-radius: 0 4px 4px 0;
}
.warning-box {
  background-color: #fff8e1;
  border-left: 4px solid #ffc107;
  padding: 20px;
  margin: 20px 0;
  border-radius: 0 4px 4px 0;
}
.article-footer {
  display: flex;
  justify-content: space-between;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid #f1f1f1;
}
.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.article-nav {
  display: flex;
  gap: 15px;
}
.nav-btn {
  padding: 8px 16px;
  background-color: #f1f1f1;
  border-radius: 4px;
  font-size: 0.9rem;
  transition: all 0.3s;
}
.nav-btn:hover {
  background-color: var(--secondary-color);
  color: white;
}

/* 相关文章 */
.related-articles {
  margin-top: 60px;
}
.related-articles h3 {
  margin-bottom: 30px;
  color: var(--primary-color);
  font-size: 1.5rem;
}

/* 英雄区域样式 */
.hero {
  background: linear-gradient(135deg, var(--primary-color) 0%, #34495e 100%);
  color: var(--light-text);
  padding: 120px 0;
  text-align: center;
}
.hero h1 {
  font-size: 3rem;
  margin-bottom: 20px;
}
.hero p {
  font-size: 1.2rem;
  max-width: 700px;
  margin: 0 auto 30px;
  opacity: 0.9;
}

/* 教程资源样式 */
.learning-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}
.card {
  background-color: white;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
  transition: transform 0.3s, box-shadow 0.3s;
}
.card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0,0,0,0.1);
}
.card-img {
  height: 200px;
  background-color: var(--secondary-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 3rem;
}
.card-content {
  padding: 25px;
}
.card-content h3 {
  margin-bottom: 15px;
  color: var(--primary-color);
}
.card-content p {
  color: #666;
  margin-bottom: 20px;
}

/* 合规声明样式 */
.compliance {
  background-color: var(--light-color);
}
.compliance-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}
.compliance-content h3 {
  color: var(--primary-color);
  margin-bottom: 20px;
}
.compliance-content p {
  margin-bottom: 20px;
  text-align: left;
}

/* 下载区域样式 */
.download-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  margin-top: 40px;
}
.download-card {
  background-color: white;
  border-radius: 8px;
  padding: 30px;
  text-align: center;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
  transition: transform 0.3s;
}
.download-card:hover {
  transform: translateY(-5px);
}
.download-card i {
  font-size: 3rem;
  color: var(--secondary-color);
  margin-bottom: 20px;
}
.download-card h3 {
  margin-bottom: 15px;
  color: var(--primary-color);
}
.download-card p {
  color: #666;
  margin-bottom: 20px;
}

/* 下载平台选择 */
.platform-tabs {
  display: flex;
  justify-content: center;
  margin-bottom: 40px;
  flex-wrap: wrap;
  gap: 10px;
}
.platform-tab {
  padding: 12px 24px;
  background-color: white;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s;
  border: 2px solid transparent;
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 500;
  box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}
.platform-tab:hover {
  transform: translateY(-3px);
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}
.platform-tab.active {
  border-color: var(--secondary-color);
  background-color: rgba(52, 152, 219, 0.05);
}
.platform-tab i {
  font-size: 1.5rem;
}

/* 下载内容区域 */
.download-content {
  display: none;
  background-color: white;
  border-radius: 8px;
  padding: 40px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
  margin-bottom: 40px;
}
.download-content.active {
  display: block;
  animation: fadeIn 0.5s ease;
}
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.download-header {
  display: flex;
  align-items: center;
  margin-bottom: 30px;
  gap: 20px;
}
.platform-icon {
  width: 80px;
  height: 80px;
  background-color: var(--secondary-color);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 2.5rem;
}
.platform-info h3 {
  font-size: 1.8rem;
  color: var(--primary-color);
  margin-bottom: 10px;
}
.platform-info p {
  color: #666;
}
.download-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin-bottom: 30px;
}
.download-option {
  background-color: #f9f9f9;
  border-radius: 8px;
  padding: 25px;
  text-align: center;
  transition: all 0.3s;
  border: 1px solid #eee;
}
.download-option:hover {
  transform: translateY(-5px);
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}
.download-option h4 {
  margin-bottom: 15px;
  color: var(--primary-color);
}
.download-option p {
  color: #666;
  margin-bottom: 20px;
  font-size: 0.9rem;
}
.version-info {
  display: flex;
  justify-content: space-between;
  margin-top: 15px;
  font-size: 0.85rem;
  color: #999;
}

/* 安装指南 */
.installation-guide {
  background-color: #f9f9f9;
  border-radius: 8px;
  padding: 30px;
  margin-top: 40px;
}
.installation-guide h3 {
  margin-bottom: 20px;
  color: var(--primary-color);
  font-size: 1.5rem;
}
.guide-steps {
  counter-reset: step-counter;
}
.guide-step {
  margin-bottom: 25px;
  padding-left: 50px;
  position: relative;
}
.guide-step::before {
  counter-increment: step-counter;
  content: counter(step-counter);
  position: absolute;
  left: 0;
  top: 0;
  width: 35px;
  height: 35px;
  background-color: var(--secondary-color);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
}
.guide-step h4 {
  margin-bottom: 10px;
  color: var(--primary-color);
}
.guide-step p {
  color: #666;
}

/* 注意事项 */
.warning-section {
  background-color: #fff8e1;
  border-left: 4px solid #ffc107;
  padding: 30px;
  margin-top: 40px;
  border-radius: 0 8px 8px 0;
}
.warning-section h3 {
  margin-bottom: 15px;
  color: #e74c3c;
  display: flex;
  align-items: center;
  gap: 10px;
}
.warning-section p {
  margin-bottom: 15px;
}
.warning-section ul {
  padding-left: 20px;
  margin-bottom: 15px;
}
.warning-section li {
  margin-bottom: 10px;
}

/* 常见问题 */
.faq-section {
  margin-top: 60px;
}
.faq-item {
  background-color: white;
  border-radius: 8px;
  margin-bottom: 15px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.05);
  overflow: hidden;
}
.faq-question {
  padding: 20px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  color: var(--primary-color);
}
.faq-question:hover {
  background-color: #f9f9f9;
}
.faq-answer {
  padding: 0 20px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}
.faq-item.active .faq-answer {
  padding: 0 20px 20px;
  max-height: 500px;
}
.faq-item.active .faq-question i {
  transform: rotate(180deg);
}
.faq-question i {
  transition: transform 0.3s ease;
}

/* 合规声明内容 */
.compliance-content {
  background-color: white;
  border-radius: 8px;
  padding: 50px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
  margin-bottom: 40px;
}
.compliance-intro {
  text-align: center;
  margin-bottom: 40px;
  padding-bottom: 30px;
  border-bottom: 1px solid #eee;
}
.compliance-intro .icon {
  font-size: 4rem;
  color: var(--secondary-color);
  margin-bottom: 20px;
}
.compliance-intro h1 {
  font-size: 2.5rem;
  color: var(--primary-color);
  margin-bottom: 20px;
}
.compliance-intro p {
  font-size: 1.1rem;
  color: #666;
  max-width: 800px;
  margin: 0 auto;
}

/* 声明条款样式 */
.statement-section {
  margin-bottom: 40px;
}
.statement-section h2 {
  color: var(--primary-color);
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid #eee;
  display: flex;
  align-items: center;
  gap: 10px;
}
.statement-section h2 i {
  color: var(--secondary-color);
}
.statement-section p {
  margin-bottom: 15px;
  color: #555;
}
.statement-section ul {
  padding-left: 20px;
  margin-bottom: 20px;
}
.statement-section li {
  margin-bottom: 10px;
  color: #555;
}

/* 警告框样式 */
.warning-box {
  background-color: #fff8e1;
  border-left: 4px solid #ffc107;
  padding: 25px;
  margin: 30px 0;
  border-radius: 0 8px 8px 0;
}
.warning-box h3 {
  color: #e74c3c;
  margin-bottom: 15px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.warning-box p {
  margin-bottom: 10px;
}
.warning-box ul {
  padding-left: 20px;
}
.warning-box li {
  margin-bottom: 8px;
}

/* 重要声明样式 */
.important-notice {
  background-color: #e8f4fd;
  border-left: 4px solid var(--secondary-color);
  padding: 25px;
  margin: 30px 0;
  border-radius: 0 8px 8px 0;
}
.important-notice h3 {
  color: var(--primary-color);
  margin-bottom: 15px;
  display: flex;
  align-items: center;
  gap: 10px;
}

/* 联系信息样式 */
.contact-info {
  background-color: #f9f9f9;
  border-radius: 8px;
  padding: 30px;
  margin-top: 40px;
}
.contact-info h3 {
  margin-bottom: 20px;
  color: var(--primary-color);
}
.contact-details {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}
.contact-item {
  display: flex;
  align-items: center;
  gap: 15px;
}
.contact-item i {
  font-size: 1.5rem;
  color: var(--secondary-color);
  width: 40px;
  text-align: center;
}

/* 关于我们内容 */
.about-intro {
  background-color: white;
  border-radius: 8px;
  padding: 60px 50px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
  margin-bottom: 60px;
  text-align: center;
}
.about-intro h1 {
  font-size: 2.8rem;
  color: var(--primary-color);
  margin-bottom: 20px;
}
.about-intro p {
  font-size: 1.2rem;
  color: #666;
  max-width: 900px;
  margin: 0 auto 30px;
}
.stats-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
  margin-top: 50px;
}
.stat-item {
  text-align: center;
  padding: 20px;
}
.stat-number {
  font-size: 3rem;
  font-weight: 700;
  color: var(--secondary-color);
  margin-bottom: 10px;
}
.stat-label {
  font-size: 1.1rem;
  color: var(--primary-color);
  font-weight: 500;
}

/* 使命与愿景 */
.mission-vision {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 40px;
  margin-bottom: 60px;
}
.mission-card,
.vision-card {
  background-color: white;
  border-radius: 8px;
  padding: 40px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
  text-align: center;
  transition: transform 0.3s;
}
.mission-card:hover,
.vision-card:hover {
  transform: translateY(-10px);
}
.mission-card i,
.vision-card i {
  font-size: 3.5rem;
  color: var(--secondary-color);
  margin-bottom: 25px;
}
.mission-card h3,
.vision-card h3 {
  font-size: 1.8rem;
  color: var(--primary-color);
  margin-bottom: 20px;
}
.mission-card p,
.vision-card p {
  color: #666;
  line-height: 1.7;
}

/* 团队介绍 */
.team-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}
.team-member {
  background-color: white;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
  transition: transform 0.3s;
}
.team-member:hover {
  transform: translateY(-10px);
}
.member-photo {
  height: 250px;
  background-color: var(--secondary-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 5rem;
}
.member-info {
  padding: 25px;
  text-align: center;
}
.member-info h3 {
  font-size: 1.4rem;
  color: var(--primary-color);
  margin-bottom: 8px;
}
.member-role {
  color: var(--secondary-color);
  font-weight: 500;
  margin-bottom: 15px;
}
.member-bio {
  color: #666;
  margin-bottom: 20px;
  font-size: 0.95rem;
}
.member-social {
  display: flex;
  justify-content: center;
  gap: 15px;
}
.member-social a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: #f1f1f1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s;
}
.member-social a:hover {
  background-color: var(--secondary-color);
  color: white;
}

/* 价值观 */
.values-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  margin-bottom: 60px;
}
.value-card {
  background-color: white;
  border-radius: 8px;
  padding: 30px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
  text-align: center;
  transition: transform 0.3s;
}
.value-card:hover {
  transform: translateY(-5px);
}
.value-icon {
  width: 70px;
  height: 70px;
  background-color: rgba(52, 152, 219, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  color: var(--secondary-color);
  font-size: 1.8rem;
}
.value-card h3 {
  font-size: 1.3rem;
  color: var(--primary-color);
  margin-bottom: 15px;
}
.value-card p {
  color: #666;
  font-size: 0.95rem;
}

/* 发展历程 */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: var(--secondary-color);
  transform: translateX(-50%);
}
.timeline-item {
  position: relative;
  margin-bottom: 50px;
  width: 100%;
}
.timeline-item:nth-child(odd) {
  padding-right: calc(50% + 30px);
  text-align: right;
}
.timeline-item:nth-child(even) {
  padding-left: calc(50% + 30px);
}
.timeline-dot {
  position: absolute;
  left: 50%;
  top: 20px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: var(--secondary-color);
  transform: translateX(-50%);
  z-index: 1;
}
.timeline-content {
  background-color: white;
  border-radius: 8px;
  padding: 25px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}
.timeline-date {
  font-weight: 600;
  color: var(--secondary-color);
  margin-bottom: 10px;
}
.timeline-content h3 {
  font-size: 1.3rem;
  color: var(--primary-color);
  margin-bottom: 10px;
}
.timeline-content p {
  color: #666;
}

/* 联系我们 */
.contact-section {
  background-color: white;
  border-radius: 8px;
  padding: 50px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 40px;
}
.contact-info h3 {
  margin-bottom: 20px;
  color: var(--primary-color);
  font-size: 1.5rem;
}
.contact-details {
  margin-bottom: 30px;
}
.contact-item {
  display: flex;
  align-items: flex-start;
  margin-bottom: 20px;
}
.contact-item i {
  font-size: 1.2rem;
  color: var(--secondary-color);
  margin-right: 15px;
  margin-top: 3px;
  width: 20px;
  text-align: center;
}
.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 12px 15px;
  margin-bottom: 20px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 1rem;
  transition: border-color 0.3s;
}
.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--secondary-color);
  outline: none;
}
.contact-form textarea {
  height: 150px;
  resize: vertical;
}

/* 页脚样式 */
footer {
  background-color: var(--primary-color);
  color: var(--light-text);
  padding: 60px 0 30px;
  margin-top: 80px;
}
.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}
.footer-column h3 {
  margin-bottom: 20px;
  font-size: 1.2rem;
  position: relative;
  padding-bottom: 10px;
}
.footer-column h3::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 40px;
  height: 2px;
  background-color: var(--secondary-color);
}
.footer-links {
  list-style: none;
}
.footer-links li {
  margin-bottom: 10px;
}
.footer-links a {
  color: #bdc3c7;
  transition: color 0.3s;
}
.footer-links a:hover {
  color: var(--secondary-color);
}
.copyright {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid rgba(255,255,255,0.1);
  color: #bdc3c7;
  font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 992px) {
  .page-content {
    flex-direction: column;
  }
  .sidebar {
    width: 100%;
  }
  .download-header {
    flex-direction: column;
    text-align: center;
  }
  .platform-info {
    text-align: center;
  }
}
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    width: 100%;
    background-color: var(--primary-color);
    flex-direction: column;
    padding: 20px 0;
    text-align: center;
  }
  .nav-links.active {
    display: flex;
  }
  .nav-links li {
    margin: 10px 0;
  }
  .mobile-menu {
    display: block;
  }
  .hero h1 {
    font-size: 2.2rem;
  }
  .hero p {
    font-size: 1rem;
  }
  .section-title h2 {
    font-size: 2rem;
  }
  .article-header h1 {
    font-size: 1.8rem;
  }
  .article-content {
    padding: 25px;
  }
  .article-footer {
    flex-direction: column;
    gap: 20px;
  }
  .compliance-content {
    padding: 30px 20px;
  }
  .compliance-intro h1 {
    font-size: 2rem;
  }
  .platform-tabs {
    flex-direction: column;
    align-items: center;
  }
  .platform-tab {
    width: 100%;
    max-width: 300px;
    justify-content: center;
  }
  .download-content {
    padding: 25px;
  }
}