/* Unified left sidebar: chapters + inline expandable section index.
   Pairs with assets/sidebar-merge.js and format.html.toc-location: left. */

#quarto-sidebar .sidebar-item-container {
  display: flex;
  align-items: center;
}

.chapter-toc-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.1rem;
  height: 1.1rem;
  flex: 0 0 auto;
  margin-right: 0.15rem;
  color: var(--bs-secondary-color, #6c757d);
  cursor: pointer;
  transition: transform 0.15s ease-in-out;
  visibility: hidden;
}

/* only show the toggle once we know (or are about to check) there's content */
li.sidebar-item:hover > .sidebar-item-container > .chapter-toc-toggle,
li.sidebar-item.chapter-expanded > .sidebar-item-container > .chapter-toc-toggle,
li.sidebar-item.chapter-toc-loading > .sidebar-item-container > .chapter-toc-toggle {
  visibility: visible;
}

li.sidebar-item.chapter-toc-empty > .sidebar-item-container > .chapter-toc-toggle {
  visibility: hidden !important;
}

li.sidebar-item.chapter-expanded > .sidebar-item-container > .chapter-toc-toggle {
  transform: rotate(90deg);
}

li.sidebar-item.chapter-toc-loading > .sidebar-item-container > .chapter-toc-toggle {
  animation: chapter-toc-spin 1s linear infinite;
}

@keyframes chapter-toc-spin {
  to { transform: rotate(360deg); }
}

/* Touch devices have no :hover, and Quarto's own off-canvas sidebar takes
   over at this same breakpoint (991.98px) — make the toggle permanently
   visible and give it a larger tap target there, instead of relying on
   hover-to-reveal (which would make it undiscoverable on mobile). */
@media (hover: none), (max-width: 991.98px) {
  .chapter-toc-toggle {
    visibility: visible;
    width: 1.8rem;
    height: 1.8rem;
    margin-right: 0.1rem;
    margin-left: -0.35rem;
  }
  li.sidebar-item.chapter-toc-empty > .sidebar-item-container > .chapter-toc-toggle {
    visibility: hidden !important;
  }
}

.chapter-toc-nested {
  display: none;
  list-style: none;
  padding-left: 1.05rem;
  margin: 0.15rem 0 0.4rem 0;
  border-left: 1px solid var(--bs-border-color, #dee2e6);
}

li.sidebar-item.chapter-expanded > .chapter-toc-nested {
  display: block;
}

.chapter-toc-nested a {
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--bs-body-color, #495057);
}

.chapter-toc-nested a.active {
  font-weight: 600;
  color: var(--bs-link-color, #4F704F);
}

.chapter-toc-nested ul {
  list-style: none;
  padding-left: 0.85rem;
  margin: 0;
}

/* .chapter-toc-nested is applied either directly to a <ul> (lazily fetched
   chapters) or to a <nav> wrapping a <ul> (the active chapter's live TOC,
   relocated as a whole to preserve Quarto's scroll-tracking); zero out the
   browser's default <ul> padding for the latter case. */
.chapter-toc-nested > ul {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.chapter-toc-nested .header-section-number {
  color: var(--bs-secondary-color, #6c757d);
  margin-right: 0.25rem;
}