:root{ --tps-blue:#3598db; }

  .tps-article{
    font-family:system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
    line-height:1.55;
  }

  /* Headings in brand color (force override theme CSS) */
  .tps-article h1,
  .tps-article h2,
  .tps-article h3,
  .tps-article h4{
    color:var(--tps-blue) !important;
    font-weight:800;
    letter-spacing:-0.2px;
  }

  /* Optional: keep hierarchy clean */
  .tps-article h1{ font-size:34px; line-height:1.15; margin:0 0 12px 0; }
  .tps-article h2{ font-size:26px; line-height:1.2;  margin:26px 0 10px 0; }
  .tps-article h3{ font-size:20px; line-height:1.25; margin:18px 0 8px 0; }
  .tps-article h4{ font-size:16px; line-height:1.3;  margin:14px 0 6px 0; }

  /* TOC box */
  .tps-article .tps-toc{
    border:1px solid #e5e5e5;
    border-radius:12px;
    padding:14px;
    margin:0 0 18px 0;
    background:#ffffff;
  }

  /* CTA / callout */
  .tps-article .tps-callout{
    margin:16px 0;
    padding:14px;
    border-left:4px solid var(--tps-blue);
    background:#f6fbff;
    border-radius:10px;
  }