/* 基础样式 */
  body {
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #1E1E1E, #2C2C2C);
    color: #FFFFFF;
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
  }

  h1, h2, h3, h4 {
    color: #00BFFF;
    text-align: center;
    margin-top: 20px;
    margin-bottom: 10px;
  }

  h1 {
    font-size: 2.5em;
    font-weight: bold;
  }

  h2 {
    font-size: 2em;
    margin-top: 30px;
  }

  h3 {
    font-size: 1.75em;
    margin-top: 25px;
  }

  h4 {
    font-size: 1.5em;
    margin-top: 20px;
  }

  p {
    max-width: 800px;
    margin: 0 auto 20px auto;
    padding: 0 20px;
    font-size: 1em;
    color: #E0E0E0;
  }

  ul, ol {
    max-width: 800px;
    margin: 0 auto 20px auto;
    padding: 0 40px;
    color: #E0E0E0;
  }

  li {
    margin-bottom: 10px;
  }

  pre {
    background: #2C2C2C;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    max-width: 800px;
    margin: 0 auto 20px auto;
  }

  code {
    color: #00BFFF;
    font-family: 'Courier New', Courier, monospace;
  }

  table {
    width: 90%;
    max-width: 800px;
    margin: 20px auto;
    border-collapse: collapse;
    background: #2C2C2C;
  }

  th, td {
    border: 1px solid #444444;
    padding: 10px;
    text-align: left;
  }

  th {
    background: #00BFFF;
    color: #1E1E1E;
  }

  a {
    color: #9C27B0;
    text-decoration: none;
  }

  a:hover {
    text-decoration: underline;
  }

  /* 卡片网格布局 */
  .card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    padding: 40px 20px;
    max-width: 1200px;
    margin: 0 auto;
  }

  .card {
    background-color: #1E1E1E;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
  }

  .card img {
    width: 100%;
    height: auto;
    border-radius: 5px;
  }

  .card h3 {
    margin: 15px 0 10px 0;
    color: #00BFFF;
    font-size: 1.5em;
  }

  .card p {
    flex-grow: 1;
    text-align: center;
    color: #E0E0E0;
  }

  .card a {
    background: linear-gradient(45deg, #00BFFF, #9C27B0);
    padding: 10px 20px;
    border-radius: 5px;
    color: #FFFFFF;
    transition: background 0.3s ease;
  }

  .card a:hover {
    background: linear-gradient(45deg, #9C27B0, #00BFFF);
  }

  .card:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.4);
  }

  /* 示例数据展示 */
  .demo-section {
    background: #2C2C2C;
    padding: 40px 20px;
    max-width: 1000px;
    margin: 40px auto;
    border-radius: 10px;
  }

  .demo-section h2 {
    color: #FF5722;
  }

  /* 响应式设计 */
  @media (max-width: 1440px) {
    body {
      padding: 10px;
    }
  }

  @media (max-width: 1200px) {
    .card-grid {
      padding: 30px 10px;
    }

    .card {
      padding: 15px;
    }
  }

  @media (max-width: 1024px) {
    .card-grid {
      grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }
  }

  @media (max-width: 768px) {
    h1 {
      font-size: 2em;
    }

    h2 {
      font-size: 1.75em;
    }

    h3 {
      font-size: 1.5em;
    }

    h4 {
      font-size: 1.25em;
    }

    p, ul, ol, table {
      padding: 0 10px;
    }

    .card-grid {
      grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
      gap: 15px;
    }
  }

  @media (max-width: 480px) {
    h1 {
      font-size: 1.75em;
    }

    .card-grid {
      grid-template-columns: 1fr;
      padding: 20px 5px;
    }

    .card {
      padding: 10px;
    }

    .card h3 {
      font-size: 1.25em;
    }

    .card p {
      font-size: 0.9em;
    }

    .demo-section table {
      font-size: 0.8em;
    }
  }

  @media (max-width: 320px) {
    h1 {
      font-size: 1.5em;
    }

    .card-grid {
      grid-template-columns: 1fr;
      padding: 15px 5px;
    }

    .card h3 {
      font-size: 1.1em;
    }

    .card p {
      font-size: 0.8em;
    }
  }

  /* 提示信息 */
  .reference-note {
    text-align: center;
    font-size: 1em;
    color: #FF9800;
    margin: 20px 0;
  }