/* Navigation and tree styles */

/* Tree list customization */
.tree small {
  display: block;
  font-style: italic;
  color: var(--text-color-alt);
  margin-top: 5px;
  margin-bottom: 10px;
}

.tree li {
  margin-bottom: 10px;
  position: relative;
  padding-left: 1.5ch;
  margin-left: 1.5ch;
  border-left: var(--border-thickness) solid var(--text-color);
}

.tree li:before {
  position: absolute;
  display: block;
  top: calc(var(--line-height) / 2);
  left: 0;
  content: "";
  width: 1ch;
  border-bottom: var(--border-thickness) solid var(--text-color);
}

.tree li:last-child {
  border-left: none;
}

.tree li:last-child:after {
  position: absolute;
  display: block;
  top: 0;
  left: 0;
  content: "";
  height: calc(var(--line-height) / 2);
  border-left: var(--border-thickness) solid var(--text-color);
}

.tree a {
  font-weight: var(--font-weight-medium);
}

/* Ensure TOC blog item has proper bullet */
nav#TOC ul.incremental > li {
  list-style-type: square;
}

/* Reset specific blog list item styles to maintain bullet */
nav#TOC ul.incremental > li:last-child {
  border-left: none;
  padding-left: 0;
  margin-left: 0;
}

nav#TOC ul.incremental > li:last-child:before,
nav#TOC ul.incremental > li:last-child:after {
  display: none;
}

/* Style nested tree in TOC specifically */
nav#TOC .tree {
  margin-top: 5px;
}

nav#TOC .tree li {
  position: relative;
  padding-left: 1.5ch;
  margin-left: 1.5ch;
  border-left: var(--border-thickness) solid var(--text-color);
  list-style-type: none;
}

nav#TOC .tree li:before {
  position: absolute;
  display: block;
  top: calc(var(--line-height) / 2);
  left: 0;
  content: "";
  width: 1ch;
  border-bottom: var(--border-thickness) solid var(--text-color);
}

nav#TOC .tree li:last-child {
  border-left: none;
}

nav#TOC .tree li:last-child:after {
  position: absolute;
  display: block;
  top: 0;
  left: 0;
  content: "";
  height: calc(var(--line-height) / 2);
  border-left: var(--border-thickness) solid var(--text-color);
}