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      * {
        transition: all 0.3s;
      }
      section {
        max-width: calc(1220px + 16px * 2);
        margin: 0 auto;
        padding: 0 16px;
      }

      .section-full {
        max-width: 100%;
      }

      /* 网站列表部分样式 */

      .letter li,
      .list li .span-letter {
        width: 32px;
        height: 32px;
        border-radius: 6px;
        display: flex;
        justify-content: center;
        align-items: center;
        font-size: 22px;
        font-weight: bold;
        cursor: pointer;
        background-color: white;
      }
      .letter li:last-child {
        width: 48px;
      }
      .letter li:hover {
        background-color: #0c53fe;
        color: white;
      }
      .list li .span-letter.active {
        background-color: #e1e2e4;
      }
      .list ul::before {
        content: "";
        display: block;
        width: 0;
        height: 100%;
        position: absolute;
        left: 15px;
        top: 0;
        border-left: 2px dashed #c0c0c0;
        z-index: 0;
      }
      .list li {
        position: relative;
        display: flex;
        justify-content: start;
        align-items: start;
        margin-bottom: 32px;
        z-index: 1;
      }
      .list li .span-letter {
        min-width: 32px;
        margin-right: 24px;
      }
      .list li:last-child .span-letter {
        min-width: 48px;
        margin-right: 8px;
      }
      .list-sites {
        display: flex;
        flex-wrap: wrap;
        row-gap: 12px;
        column-gap: 12px;
      }
      .list-sites span {
        display: block;
        padding: 4px 8px;
        border-radius: 12px;
        font-size: 18px;
        background-color: #dbe1e5;
        min-width: 117px;
        text-align: center;
      }
      /* .list-sites span:hover {
        color: #0c53fe;
        text-decoration: underline;
      } */
      /*定义滚动条宽高及背景，宽高分别对应横竖滚动条的尺寸*/
      .list::-webkit-scrollbar {
        width: 12px;
        height: 12px;
        border-radius: 12px;
      }
      /*定义滑块，内阴影及圆角*/
      .list::-webkit-scrollbar-thumb {
        /*width: 10px;*/
        height: 20px;
        border-radius: 12px;
        background-color: #dbe1e5;
      }
      @media (max-width: 1023.98px) {
        .letter li,
        .list li .span-letter {
          width: 28px;
          height: 28px;
          font-size: 18px;
        }
        .letter li:last-child {
          width: 42px;
        }
        .list ul::before {
          left: 13px;
        }
        .list li .span-letter {
          min-width: 28px;
          margin-right: 20px;
        }
        .list li:last-child .span-letter {
          min-width: 42px;
          margin-right: 6px;
        }
        .list-sites span {
          font-size: 16px;
        }
      }