/* Table of contents for posts. Built by toc.js; load after sidenotes.css. */

.post-body h2 { scroll-margin-top: 1.5rem; }

/* Default (narrow screens): collapsible box at the top of the article */
.toc details {
  border: var(--border-width) solid var(--border);
  border-radius: var(--standard-border-radius);
  background: var(--accent-bg);
  padding: 0.5rem 1rem;
  margin-bottom: 2rem;
  font-size: 0.95rem;
}
.toc summary { cursor: pointer; font-weight: bold; color: var(--text-light); }
.toc ol { margin: 0.5rem 0 0; padding-left: 1.25rem; }
.toc li { margin: 0.25rem 0; }
.toc a { text-decoration: none; color: var(--text-light); }
.toc a:hover,
.toc a[aria-current] { color: var(--accent); }

/* Wide screens: float in the left margin and stay in view while scrolling */
@media (min-width: 80rem) {
  /* Re-center the article column with room on both sides (TOC left, sidenotes right) */
  body { grid-template-columns: minmax(16rem, 1fr) min(45rem, 90%) minmax(18rem, 1fr) 0; }
  main { position: relative; }

  .toc {
    position: absolute;           /* spans the full height of <main>... */
    top: 4rem; bottom: 0;         /* start level with the article title */
    right: calc(100% + 2rem);
    width: 13rem;
  }
  .toc details {
    position: sticky;             /* ...so the list can stick inside it */
    top: 2rem;
    max-height: calc(100vh - 4rem);
    overflow-y: auto;
    overflow-x: hidden;
    margin: 0;
    padding: 0;
    border: 0;
    border-radius: 0;
    background: none;
    font-size: 0.85rem;
    line-height: 1.4;
  }
  .toc summary {
    pointer-events: none;         /* can't collapse it while it's a sidebar */
    list-style: none;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.75rem;
    margin-bottom: 0.5rem;
  }
  .toc summary::-webkit-details-marker { display: none; }
  .toc ol {
    list-style: none;
    padding-left: 0;
    border-left: 2px solid var(--border);
  }
  .toc li { margin: 0; }
  .toc a {
    display: block;
    padding: 0.2rem 0 0.2rem 0.75rem;
    margin-left: -2px;
    border-left: 2px solid transparent;
  }
  .toc a[aria-current] { border-left-color: var(--accent); }
}