* { margin: 0; padding: 0; box-sizing: border-box; }
  body {
    width: 900px;
    margin: 0 auto;
    font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    background: linear-gradient(180deg, #eaf4f6 0%, #f4f9fa 40%, #ffffff 100%);
    color: #333;
    -webkit-font-smoothing: antialiased;
  }
  .wrap { padding: 40px 60px 30px; }

  /* 章节标题 */
  .sec {
    display: flex;
    align-items: center;
    margin: 30px 0 14px;
  }
  .sec .bar {
    width: 5px; height: 22px;
    background: #0d9488;
    border-radius: 3px;
    margin-right: 10px;
  }
  .sec h2 {
    font-size: 18px;
    color: #0f4c5c;
    font-weight: 700;
  }
  .sec .letter {
    display: inline-block;
    width: 24px; height: 24px;
    line-height: 24px;
    text-align: center;
    background: #0d9488;
    color: #fff;
    border-radius: 50%;
    font-size: 13px;
    font-weight: 700;
    margin-right: 10px;
  }

  /* 正文 */
  p.body {
    font-size: 13px;
    line-height: 1.85;
    color: #3a3a3a;
    margin-bottom: 12px;
    text-align: justify;
  }
  .lead {
    background: #ffffff;
    border-left: 4px solid #0d9488;
    padding: 14px 18px;
    border-radius: 0 10px 10px 0;
    font-size: 13px;
    line-height: 1.85;
    color: #3a3a3a;
    margin: 8px 0 16px;
    box-shadow: 0 2px 10px rgba(15,76,92,0.06);
  }

  /* 列表 */
  ul.dot { list-style: none; margin: 8px 0 14px; }
  ul.dot li {
    font-size: 13px;
    line-height: 1.8;
    color: #3a3a3a;
    padding-left: 22px;
    position: relative;
    margin-bottom: 6px;
  }
  ul.dot li::before {
    content: "";
    position: absolute;
    left: 5px; top: 11px;
    width: 7px; height: 7px;
    background: #0d9488;
    border-radius: 50%;
  }

  /* 步骤 */
  .step {
    display: flex;
    margin: 18px 0 8px;
    align-items: flex-start;
  }
  .step .num {
    flex: 0 0 24px;
    height: 24px;
    line-height: 24px;
    text-align: center;
    background: #0f4c5c;
    color: #fff;
    border-radius: 50%;
    font-size: 12px;
    font-weight: 700;
    margin-right: 12px;
    margin-top: 2px;
  }
  .step .txt {
    font-size: 13px;
    line-height: 1.8;
    color: #3a3a3a;
  }
  .path {
    font-family: "SF Mono", Menlo, monospace;
    background: #e6f4f4;
    color: #0f4c5c;
    padding: 1px 6px;
    border-radius: 4px;
    font-size: 12px;
  }

  /* 图片 */
  figure {
    margin: 12px 0 18px;
    text-align: center;
  }
  figure img {
    max-width: 100%;
    border: 1px solid #dfe8ea;
    border-radius: 8px;
    box-shadow: 0 4px 14px rgba(15,76,92,0.08);
  }
  figcaption {
    font-size: 11.5px;
    color: #8a9aa2;
    margin-top: 6px;
  }
  .img-row {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin: 12px 0 18px;
  }
  .img-row figure { margin: 0; flex: 1; }