body { margin: 0; background: #f4f8fa; font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
    color: #2a2a2a; font-size: 14px; font-weight: 300; letter-spacing: 1.5px; line-height: 1.9; }
  .crumb { font-size: 13px; color: #1f7a8c; font-weight: 500; margin-bottom: 6px; }
  .crumb a { color: #1f7a8c; text-decoration: none; }
  h1 { font-size: 22px; font-weight: 600; color: #1f7a8c; margin: 6px 0 6px; }
  .sub { font-size: 15px; font-weight: 500; color: #6b96a0; margin: 0 0 20px; }
  .card { background: #fff; border-radius: 14px; padding: 22px 26px; margin: 18px 0;
    border: 1px solid #e0ecef; box-shadow: 0 2px 8px rgba(31,122,140,.05); }
  .sec { font-size: 18px; font-weight: 600; color: #2a2a2a; margin: 8px 0 14px;
    padding-left: 10px; border-left: 3px solid #1f7a8c; display: flex; align-items: center; }
  .sec span { font-size: 13px; color: #6b96a0; margin-left: 8px; font-weight: 400; }
  .ic { width: 36px; height: 36px; border-radius: 50%; background: #e6f4f7; color: #1f7a8c; display: flex; align-items: center; justify-content: center; font-size: 17px; margin-right: 10px; flex-shrink: 0; }
  h4 { font-size: 15px; font-weight: 500; color: #1f7a8c; margin: 16px 0 8px; }
  ul, ol { margin: 6px 0 12px; padding-left: 22px; }
  li { margin: 6px 0; }
  .em { color: #1f7a8c; font-weight: 500; }
  .fun { background: #eef8fa; border-left: 3px solid #1f7a8c; border-radius: 8px; padding: 12px 16px;
    margin: 12px 0; font-size: 14px; color: #333; }
  .fun b { color: #1f7a8c; }
  .fun i { color: #1f7a8c; margin-right: 6px; }
  .safe { background: #fff; border: 2px solid #1f7a8c; border-radius: 12px; padding: 18px 22px; margin: 16px 0; }
  .safe h4 { margin-top: 0; }
  .quote { font-size: 16px; color: #1f7a8c; font-weight: 500; text-align: center;
    margin: 24px 0 10px; padding: 12px 16px; background: #eef8fa; border-radius: 10px; }
  .end { margin-top: 28px; padding: 16px 20px; background: #e8f1f3; border-radius: 12px;
    font-size: 13px; color: #666; }
  .end i { color: #1f7a8c; margin-right: 6px; }
  ol li::before { content: counter(step); position: absolute; left: 0; top: 0;
    width: 24px; height: 24px; background: #1f7a8c; color: #fff; border-radius: 50%;
    font-size: 13px; font-weight: 600; display: flex; align-items: center; justify-content: center; }