body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      margin: 0;
      padding: 0;
      background: #fafafa;
      color: #333;
      line-height: 1.6;
    }
    .container {
      max-width: 800px;
      margin: 0 auto;
      padding: 20px;
      background: #fff;
    }
    h1 {
      font-size: 1.8em;
      margin-bottom: 0.6em;
      text-align: center;
    }
    h2 {
      font-size: 1.2em;
      margin-top: 1.4em;
      margin-bottom: 0.6em;
    }
    p {
      margin: 0.5em 0;
      text-align: justify;
    }
    ul {
      padding-left: 20px;
    }
     /* 表格容器：让小屏幕可以横向滚动 */
    .table-wrapper {
      width: 100%;
      overflow-x: auto;
      -webkit-overflow-scrolling: touch;
      margin: 1em 0;
    }

    /* 基础表格样式 */
    table {
      width: 100%;
      border-collapse: collapse;
      font-size: 0.95em;
      min-width: 500px; /* 避免内容挤压 */
    }
    table th,
    table td {
      border: 1px solid #ddd;
      padding: 10px;
      text-align: left;
      white-space: nowrap; /* 避免文字换行撑高单元格 */
    }
    table th {
      background-color: #f5f5f5;
      font-weight: bold;
    }
    table tr:nth-child(even) {
      background-color: #fafafa;
    }
    table tr:hover {
      background-color: #f0f8ff;
    }
    .footer {
      margin-top: 2em;
      font-size: 0.9em;
      color: #666;
      text-align: center;
    }