/* 基本样式设置 */
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }

  body {
    font-family: 'Roboto', sans-serif;
    background: linear-gradient(135deg, #2c3e50, #3498db);
    color: #ffffff;
    line-height: 1.6;
    padding: 20px;
  }

  h1, h2, h3 {
    font-weight: 700;
    margin-bottom: 15px;
  }

  h1 {
    font-size: 2.5em;
    letter-spacing: 2px;
    text-align: center;
    margin-top: 20px;
  }

  h2 {
    font-size: 2em;
    margin-top: 30px;
    border-bottom: 2px solid #ffffff;
    padding-bottom: 10px;
  }

  h3 {
    font-size: 1.5em;
    margin-top: 25px;
  }

  p {
    font-size: 1em;
    margin-bottom: 15px;
  }

  /* 导航栏样式 */
  .navbar {
    display: flex;
    justify-content: center;
    background: rgba(0, 0, 0, 0.6);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
  }

  .nav-item {
    margin: 0 20px;
    color: #ffffff;
    text-decoration: none;
    font-size: 1.1em;
    transition: color 0.3s ease;
  }

  .nav-item:hover {
    color: #ffcc00;
  }

  /* 主容器样式 */
  .container {
    max-width: 1200px;
    margin: auto;
    padding: 20px;
  }

  /* 卡片布局 */
  .card-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 30px;
  }

  .card {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.3);
    transition: transform 0.3s ease, background 0.3s ease;
  }

  .card:hover {
    transform: translateY(-10px);
    background: rgba(255, 255, 255, 0.2);
  }

  .card img {
    width: 100%;
    border-radius: 10px;
    margin-bottom: 15px;
  }

  /* 示例数据展示样式 */
  .example-section {
    background: rgba(44, 62, 80, 0.8);
    padding: 30px;
    border-radius: 15px;
    margin-top: 40px;
  }

  .example-section h2 {
    text-align: center;
    margin-bottom: 20px;
  }

  .example-section pre {
    background: rgba(0, 0, 0, 0.7);
    padding: 15px;
    border-radius: 10px;
    overflow-x: auto;
    margin-bottom: 15px;
  }

  .example-section code {
    color: #ffcc00;
    font-family: 'Courier New', Courier, monospace;
  }

  /* 响应式设计 */
  @media (max-width: 768px) {
    h1 {
      font-size: 2em;
    }

    .nav-item {
      margin: 0 10px;
      font-size: 1em;
    }
  }

  @media (max-width: 480px) {
    .navbar {
      flex-direction: column;
    }

    .nav-item {
      margin: 10px 0;
    }
  }

  /* 按钮样式 */
  .button {
    background-color: #e74c3c;
    border: none;
    padding: 10px 20px;
    color: #ffffff;
    font-size: 1em;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.3s ease;
    text-decoration: none;
    display: inline-block;
  }

  .button:hover {
    background-color: #c0392b;
  }

  /* 底部提示样式 */
  .footer-note {
    text-align: center;
    margin-top: 50px;
    font-size: 1.2em;
    color: #bdc3c7;
  }