/* =========================================================
   shape-category-list.css
   Responsibility: ShapeCategoryList container, ShapeCategoryItem
   layout, hover effects, ActiveShapeCategoryItem highlight,
   and empty state display.
   Phase Coverage: 1.2
   ========================================================= */

/* ── Category List Container ─────────────────────────────── */
#ShapeCategoryList {
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 6px 5px;
  gap: 2px;
  flex-shrink: 0;
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
  /* Height is controlled dynamically via JS / splitter */
}

#ShapeCategoryList::-webkit-scrollbar {
  width: 3px;
}

#ShapeCategoryList::-webkit-scrollbar-track {
  background: transparent;
}

#ShapeCategoryList::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}

/* ── Category Item ───────────────────────────────────────── */
.ShapeCategoryItem {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 7px 10px 7px 11px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--t-fast), border-color var(--t-fast), color var(--t-fast);
  position: relative;
  color: var(--color-text-secondary);
  font-size: 12px;
  font-weight: 500;
  border: 1px solid transparent;
  user-select: none;
  outline: none;
  overflow: hidden;
}

.ShapeCategoryItem::before {
  content: '';
  position: absolute;
  left: 0;
  top: 22%;
  height: 56%;
  width: 3px;
  background: transparent;
  border-radius: 0 2px 2px 0;
  transition: background var(--t-fast);
}

.ShapeCategoryItem:hover {
  background: var(--color-surface-hover);
  color: var(--color-text-primary);
  border-color: var(--color-border);
}

.ShapeCategoryItem:focus-visible {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px var(--color-accent-glow);
}

/* ── Active (Selected) Category ─────────────────────────── */
.ShapeCategoryItem.ActiveShapeCategoryItem {
  background: var(--color-accent-glow);
  color: var(--color-text-accent);
  border-color: rgba(99, 102, 241, 0.25);
  font-weight: 600;
}

.ShapeCategoryItem.ActiveShapeCategoryItem::before {
  background: var(--color-accent);
}

/* ── Category Icon ───────────────────────────────────────── */
.category-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.75;
  transition: opacity var(--t-fast);
}

.category-icon svg {
  width: 18px;
  height: 18px;
}

.ShapeCategoryItem:hover .category-icon,
.ShapeCategoryItem.ActiveShapeCategoryItem .category-icon {
  opacity: 1;
}

/* ── Category Name ───────────────────────────────────────── */
.category-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

/* ── Item Count Badge ────────────────────────────────────── */
.category-count {
  font-size: 10px;
  font-weight: 600;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 1px 6px;
  border-radius: 10px;
  color: var(--color-text-muted);
  flex-shrink: 0;
  min-width: 22px;
  text-align: center;
  transition: background var(--t-fast), color var(--t-fast), border-color var(--t-fast);
}

.ShapeCategoryItem.ActiveShapeCategoryItem .category-count {
  background: rgba(99, 102, 241, 0.18);
  border-color: rgba(99, 102, 241, 0.3);
  color: var(--color-accent-light);
}

/* ── Empty State ─────────────────────────────────────────── */
.category-list-empty {
  padding: 20px 14px;
  text-align: center;
  font-size: 12px;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* ── Category List Label (section header) ────────────────── */
.category-list-label {
  padding: 8px 12px 4px;
  font-size: 10px;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
}