.toc-group-title {
  margin: 0 0 12px;
  padding-left: 10px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 750;
  line-height: 1.5;
}
.toc-group + .toc-group {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
}
.mobile-toc .toc-group:first-child { margin-top: 18px; }
.mobile-toc .toc-group .toc { margin-top: 0; }

/* Keep the article outline beside the text, including narrower desktop panes. */
@media screen and (min-width: 820px) {
  .page-layout {
    display: grid;
    max-width: 1480px;
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 32px;
    padding: 0 28px;
  }
  .sidebar { display: block; min-width: 0; }
  .sidebar > nav {
    position: sticky;
    top: 24px;
    max-height: calc(100dvh - 48px);
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: 35px 10px 20px 0;
  }
  .toc-label { margin-bottom: 16px; }
  .toc a { padding-left: 8px; gap: 5px; }
  .toc .toc-level-2 a { padding-left: 12px; }
  .toc a > span:empty { display: none; }
  .mobile-toc { display: none; }
}
@media screen and (min-width: 1200px) {
  .page-layout { grid-template-columns: 210px minmax(0, 1fr); gap: 40px; }
}
@media screen and (max-width: 819px) {
  .page-layout { display: block; }
  .sidebar { display: none; }
  .mobile-toc {
    display: block;
    position: fixed;
    right: 16px;
    bottom: 20px;
    z-index: 40;
    margin: 0;
    padding: 11px 16px;
    max-width: calc(100vw - 32px);
    border: 1px solid var(--rule);
    border-radius: 10px;
    background: var(--paper);
    box-shadow: 0 6px 24px #00000018;
  }
  .mobile-toc[open] { width: 320px; }
  .mobile-toc nav { max-height: 65dvh; overflow-y: auto; overscroll-behavior: contain; }
  .mobile-toc summary { color: var(--ink); cursor: pointer; }
  .mobile-toc .toc { margin-top: 16px; }
  .mobile-toc .toc a > span:empty { display: none; }
}
@media print { .sidebar, .mobile-toc { display: none !important; } }

/* One shared reading column: title, introduction, video, findings and full article. */
main > article {
  width: 100%;
  max-width: 960px;
  margin-inline: auto;
}
main > article :is(.article-header, .article-introduction, .video-intro,
  .execution-showcase, #tldr, .abstract-fold, .article-content, .article-footer) {
  width: 100%;
  max-width: none;
  margin-inline: 0;
}