/* Category tree - self-contained scroll region */
.categoryTree {
  flex: 1;
  overflow-y: auto;
  padding: var(--node-editor-space-xs) 0;
  min-height: 0;
}

/* Scrollbar styling */
.categoryTree::-webkit-scrollbar {
  width: var(--node-editor-space-sm);
}

.categoryTree::-webkit-scrollbar-track {
  background: transparent;
}

.categoryTree::-webkit-scrollbar-thumb {
  background: var(--node-editor-scroll-bar-thumb-color);
  border-radius: var(--node-editor-control-border-radius);
}

.categoryTree::-webkit-scrollbar-thumb:hover {
  background: var(--node-editor-active-scroll-bar-thumb-color);
}

.categoryTree {
  scrollbar-width: thin;
  scrollbar-color: var(--node-editor-scroll-bar-thumb-color) transparent;
}

/* Tree item styles */
.treeItem {
  display: flex;
  flex-direction: column;
}

.treeItemHeader {
  display: flex;
  align-items: center;
  gap: var(--node-editor-space-xs);
  padding: var(--node-editor-space-xs) var(--node-editor-space-md);
  padding-right: var(--node-editor-space-sm);
  cursor: pointer;
  transition: background-color var(--node-editor-transition-duration) ease;
  font-size: var(--node-editor-inspector-font-size-body);
  color: var(--node-editor-text-color);
  min-height: 28px;
  box-sizing: border-box;
}

.treeItemHeader:hover {
  background: var(--node-editor-control-hover-background);
}

.treeItemHeader[data-is-selected="true"] {
  background: var(--node-editor-selected-control-color);
  color: var(--node-editor-selected-control-text-color);
}

.expandButton {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  color: inherit;
  flex-shrink: 0;
}

.expandIcon {
  font-size: 8px;
  transition: transform var(--node-editor-transition-duration) ease;
  display: inline-block;
}

.expandIcon[data-expanded="true"] {
  transform: rotate(90deg);
}

.expandPlaceholder {
  width: 16px;
  flex-shrink: 0;
}

.categoryLabel {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.categoryCount {
  font-size: var(--node-editor-inspector-font-size-meta);
  color: var(--node-editor-tertiary-label-color);
  flex-shrink: 0;
}

.treeItemHeader[data-is-selected="true"] .categoryCount {
  color: inherit;
  opacity: 0.8;
}

.treeChildren {
  display: flex;
  flex-direction: column;
}