/* 基础样式 */
a {
    color: #333;
    text-decoration: none;
  }
  
  a:hover {
    color: #0091ea;
    text-decoration: underline;
  }
  
  a:focus {
    outline: none;
  }
  
  a.button {
    display: inline-block;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    text-align: center;
    color: #fff;
    background-color: #00c853;
    text-decoration: none;
    font-size: 14px;  
    transition: all 0.3s ease-in-out;
  }
  
  a.button:hover {
    opacity: 0.8;
  }
  
  a.copy {
    background-color: #0091ea;
  }
  
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color: #333;
  }
  
  img {
    max-width: 100%;
    height: auto;
    display: block;
  }
  
  /* 页面布局 */
  header {
    padding: 30px;
    background-color: #f0f0f0;
    text-align: center;
  }
  
  main {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 50px;
  }
  
  section {
    margin-right: 50px;
    flex: 1;
  }
  
  ul.resources {
    list-style: none;
  }
  
  li {
    display: flex;
    margin-bottom: 20px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
    overflow: hidden;
  }
  
  .thumbnail {
    flex: 0 0 200px;
    height: 180px;
    background-color: #f0f0f0;
  }
  
  .info {
    margin: 20px;
    flex: 1;
  }
  
  .info h3 {
    font-size: 24px;
    margin-bottom: 10px;
    font-weight: bold;
  }
  
  .info p {
    margin-bottom: 10px;
    font-size: 14px;
  }
  
  .buttons {
    display: flex;
    justify-content: space-between;
    margin-top: 30px;
    margin-bottom: 10px;
  }
  
  .button {
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    text-align: center;
    color: #fff;
    text-decoration: none;
    font-size: 14px;  
    transition: all 0.3s ease-in-out;
  }
  
  .button:hover {
    opacity: 0.8;
  }
  
  .download {
    background-color: #00c853;
  }
  
  .copy {
    background-color: #0091ea;
  }
  
  .copy:focus {
    outline: none;
  }
  
  footer {
    text-align: center;
    padding: 20px;
    background-color: #f0f0f0;
  }
  
  /* 响应式布局 */
  @media screen and (max-width: 768px) {
    main {
      flex-wrap: wrap;
    }
    
    section {
      margin-right: 0;
      margin-bottom: 30px;
    }
    
    .thumbnail {
      display: none;
    }
    
    .info {
      margin-left: 0;
    }
  }