@layer page {
  /* Shared by 7 pages. Extracted from duplicated inline CSS. */
  .chapter-flow {
    border: 1px solid #c7d7eb;
    border-left: 6px solid #0a192f;
    background: #f8fbff;
    padding: 18px 20px;
    margin: 22px 0;
    line-height: 1.9;
  }
  .chapter-flow ol {
    margin: 10px 0 0;
    padding-left: 1.4em;
  }
}