body {
    font-family: "微软雅黑", sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f5f5f5;
  }
  
  .main-container {
    max-width: 1200px;
    margin: 0 auto;
    background-color: white;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    border-radius: 8px;
    overflow: hidden;
  }
  
  .banner {
    width: 100%;
    background-color: #fff;
    text-align: center;
    padding: 10px 0;
  }
  
  .banner-img {
    width: 100%;
    max-width: 1200px;
    height: auto;
    display: block;
    margin: 0 auto;
  }
  
  .menu {
    display: flex;
    justify-content: center;
    background-color: #fff;
    padding: 15px 0;
    border-bottom: 2px solid red;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);;
  }
  
  .menu a {
    margin: 0 20px;
    text-decoration: none;
    font-size: 30px;
    color: #333;
    padding: 8px 5px;
    transition: all 0.3s ease;
    position: relative;
  }
  
  .menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: transparent;
  }
  
  .menu a:hover {
    color: #e60012;
  }
  
  .menu a:hover::after {
    background-color: #e60012;
  }
  
  .menu a.active {
    color: #e60012;
  }
  
  .menu a.active::after {
    background-color: #e60012;
  }
  
  .content {
    padding: 30px;
    background-color: white;
  }
  
  .content-item {
    display: none;
    text-align: left;
  }
  
  #aiguo {
    display: block;
  }
  
  .content-item:target {
    display: block;
  }
  
  #mingli:target ~ #aiguo,
  #tuanjie:target ~ #aiguo,
  #qinjian:target ~ #aiguo,
  #jingye:target ~ #aiguo {
    display: none;
  }
  
  .content-item p {
    font-size: 16px;
    line-height: 1.8;
    color: #333;
    margin: 0 0 15px 0;
    text-indent: 2em;
  }
  
  .content-item p:last-child {
    margin-bottom: 0;
  }
  
  @media (max-width: 768px) {
    .main-container {
      border-radius: 0;
    }
    
    .menu {
      flex-wrap: wrap;
    }
    
    .menu a {
      margin: 5px 10px;
      font-size: 16px;
    }
    
    .content {
      padding: 20px 15px;
    }
  }