/* 全局样式 */
  body {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', 'Open Sans', sans-serif;
    background: linear-gradient(135deg, #a1c4fd, #c2e9fb);
    color: #333;
    overflow-x: hidden;
  }

  /* 导航栏 */
  .navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 40px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    z-index: 1000;
  }

  .navbar a {
    text-decoration: none;
    color: #fff;
    margin: 0 15px;
    font-weight: bold;
    transition: color 0.3s ease;
  }

  .navbar a:hover {
    color: #ffd700;
  }

  /* 主要内容区 */
  .container {
    max-width: 1200px;
    margin: 100px auto 50px;
    padding: 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
  }

  /* 卡片样式 */
  .card {
    background: rgba(255, 255, 255, 0.6);
    border-radius: 15px;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    padding: 20px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .card:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 20px rgba(0,0,0,0.3);
  }

  /* 标题样式 */
  h1, h2, h3, h4 {
    color: #2c3e50;
    margin-bottom: 15px;
  }

  h1 {
    font-size: 2.5em;
    text-align: center;
    margin-top: 80px;
  }

  h2 {
    font-size: 2em;
    border-bottom: 2px solid #bdc3c7;
    padding-bottom: 10px;
  }

  /* 段落样式 */
  p {
    line-height: 1.6;
    margin-bottom: 15px;
  }

  /* 列表样式 */
  ul {
    list-style: disc inside;
    margin-bottom: 15px;
  }

  /* 表格样式 */
  table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
  }

  table, th, td {
    border: 1px solid #bdc3c7;
  }

  th, td {
    padding: 10px;
    text-align: left;
  }

  th {
    background: #ecf0f1;
  }

  /* 代码块样式 */
  pre {
    background: #2d3436;
    color: #dfe6e9;
    padding: 15px;
    border-radius: 10px;
    overflow-x: auto;
    font-family: 'Courier New', Courier, monospace;
    margin-bottom: 20px;
  }

  code {
    font-family: 'Courier New', Courier, monospace;
    color: #dfe6e9;
  }

  /* 图片样式 */
  .decorative-image {
    width: 100%;
    height: auto;
    border-radius: 10px;
  }

  /* 响应式设计 */
  @media (max-width: 1440px) {
    .container {
      max-width: 1000px;
    }
  }

  @media (max-width: 1200px) {
    .container {
      max-width: 900px;
    }
  }

  @media (max-width: 1024px) {
    .navbar {
      padding: 15px 30px;
    }
    h1 {
      font-size: 2em;
    }
    .container {
      gap: 20px;
    }
  }

  @media (max-width: 768px) {
    .container {
      grid-template-columns: 1fr;
    }
    .navbar {
      flex-direction: column;
      align-items: flex-start;
    }
  }

  @media (max-width: 480px) {
    .navbar a {
      margin: 5px 0;
    }
    h1 {
      font-size: 1.8em;
    }
  }

  @media (max-width: 320px) {
    .navbar {
      padding: 10px 20px;
    }
    h1 {
      font-size: 1.5em;
    }
  }