/* 重置样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f5f5f5;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  background-color: #fff;
}

/* 头部样式 */
.header {
  background-color: #2c3e50;
  color: #fff;
  padding: 1rem 0;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.logo h1 {
  text-align: center;
  font-size: 1.8rem;
  margin-bottom: 1rem;
}

.nav ul {
  display: flex;
  justify-content: center;
  list-style: none;
}

.nav li {
  margin: 0 1rem;
}

.nav a {
  color: #fff;
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  transition: background-color 0.3s;
}

.nav a:hover,
.nav a.active {
  background-color: #3498db;
}

/* 横幅样式 */
.banner {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #fff;
  text-align: center;
  padding: 4rem 1rem;
}

.banner-content h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.banner-content p {
  font-size: 1.2rem;
  margin-bottom: 2rem;
}

.banner-buttons {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn-primary,
.btn-secondary {
  display: inline-block;
  padding: 0.8rem 2rem;
  text-decoration: none;
  border-radius: 30px;
  font-weight: bold;
  transition: transform 0.3s, box-shadow 0.3s;
}

.btn-primary {
  background-color: #fff;
  color: #667eea;
}

.btn-secondary {
  background-color: transparent;
  color: #fff;
  border: 2px solid #fff;
}

.btn-primary:hover,
.btn-secondary:hover {
  transform: translateY(-3px);
  box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

/* 主要内容样式 */
.main {
  padding: 2rem 1rem;
}

.features h2,
.news h2,
.knowledge-section h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 2rem;
  color: #2c3e50;
}

/* 功能卡片样式 */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.feature-card {
  background-color: #fff;
  border-radius: 10px;
  padding: 2rem;
  text-align: center;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
  transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: #2c3e50;
}

.feature-card p {
  margin-bottom: 1rem;
  color: #666;
}

.btn-link {
  display: inline-block;
  color: #3498db;
  text-decoration: none;
  font-weight: bold;
  transition: color 0.3s;
}

.btn-link:hover {
  color: #2980b9;
}

/* 新闻列表样式 */
.news-list {
  max-width: 800px;
  margin: 0 auto;
}

.news-item {
  background-color: #fff;
  border-radius: 10px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.news-item h3 {
  font-size: 1.3rem;
  margin-bottom: 0.5rem;
  color: #2c3e50;
}

.news-date {
  color: #7f8c8d;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

/* 知识库样式 */
.knowledge-category {
  margin-bottom: 3rem;
  padding: 2rem;
  background-color: #fff;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.knowledge-category h3 {
  font-size: 1.8rem;
  color: #2c3e50;
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid #3498db;
}

.knowledge-content h4 {
  font-size: 1.3rem;
  margin: 1.5rem 0 1rem 0;
  color: #34495e;
}

.knowledge-content ul,
.knowledge-content ol {
  margin-left: 2rem;
  margin-bottom: 1rem;
}

.knowledge-content li {
  margin-bottom: 0.5rem;
}

.knowledge-content p {
  margin-bottom: 1rem;
  line-height: 1.8;
}

/* 页脚样式 */
.footer {
  background-color: #2c3e50;
  color: #fff;
  text-align: center;
  padding: 2rem 1rem;
  margin-top: 2rem;
}

.footer-content p {
  margin-bottom: 0.5rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .nav ul {
    flex-direction: column;
    align-items: center;
  }
  
  .nav li {
    margin: 0.5rem 0;
  }
  
  .banner-content h2 {
    font-size: 2rem;
  }
  
  .feature-grid {
    grid-template-columns: 1fr;
  }
  
  .banner-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .btn-primary,
  .btn-secondary {
    width: 80%;
    text-align: center;
  }
}