/**
 * FrontBlocks Table of Contents.
 */

.frbl-toc,
.frbl-toc--collapsible {
  --frbl-toc-accent: #0073aa;
  box-sizing: border-box;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 4px;
  padding: 1em 1.25em;
  margin: 0 0 1.5em;
}

.frbl-toc *,
.frbl-toc--collapsible * {
  box-sizing: inherit;
}

.frbl-toc__title {
  margin: 0 0 0.5em;
  font-weight: 600;
}

.frbl-toc--collapsible > summary.frbl-toc__title {
  cursor: pointer;
  margin: 0;
  list-style: none;
}

.frbl-toc--collapsible > summary.frbl-toc__title::-webkit-details-marker {
  display: none;
}

.frbl-toc--collapsible > summary.frbl-toc__title::before {
  content: '▸';
  display: inline-block;
  margin-right: 0.4em;
  transition: transform 150ms ease;
}

.frbl-toc--collapsible[open] > summary.frbl-toc__title::before {
  transform: rotate(90deg);
}

.frbl-toc--collapsible > .frbl-toc__nav {
  margin-top: 0.75em;
}

.frbl-toc__list {
  margin: 0;
  padding: 0 0 0 1.25em;
}

.frbl-toc__list--plain {
  list-style: none;
  padding-left: 0;
}

.frbl-toc__item {
  margin: 0.25em 0;
}

.frbl-toc__item--level-3 {
  margin-left: 1em;
}

.frbl-toc__item--level-4 {
  margin-left: 2em;
}

.frbl-toc__item--level-5 {
  margin-left: 3em;
}

.frbl-toc__item--level-6 {
  margin-left: 4em;
}

.frbl-toc__link {
  text-decoration: none;
  color: inherit;
}

.frbl-toc__link:hover {
  text-decoration: underline;
}

.frbl-toc__link[aria-current='location'] {
  font-weight: 600;
  color: var(--frbl-toc-accent);
}

.frbl-toc__link:focus-visible {
  outline: 2px solid var(--frbl-toc-accent);
  outline-offset: 2px;
}

.frbl-toc--sticky {
  position: sticky;
  top: 1em;
  max-height: calc(100vh - 2em);
  overflow-y: auto;
}

/* Headings targeted by a Table of Contents link get tabindex="-1" so they
 * can receive focus programmatically. Scoped to [data-frbl-toc-heading]
 * rather than a bare [tabindex="-1"] selector, so this doesn't affect
 * focus styling on unrelated tabindex="-1" elements elsewhere on the site. */
[data-frbl-toc-heading]:focus {
  outline: 2px solid var(--frbl-toc-accent);
  outline-offset: 4px;
}

@media (prefers-reduced-motion: reduce) {
  .frbl-toc,
  .frbl-toc--collapsible,
  .frbl-toc--collapsible > summary.frbl-toc__title::before {
    transition: none;
  }

  html {
    scroll-behavior: auto;
  }
}