/* ========================================
   MARKETPLACE CATEGORY TREE NAVIGATION
   Hierarchical, collapsible category tree
   No JavaScript - pure CSS with checkboxes
   ======================================== */

:root {
  --tree-indent: 1.25rem;
  --tree-bg: #ffffff;
  --tree-border: #e5e7eb;
  --tree-text: #374151;
  --tree-hover-bg: #f9fafb;
  --tree-active-bg: rgba(184, 134, 11, 0.08);
  --tree-active-border: #B8860B;
  --tree-gold: #B8860B;
  --tree-gold-dark: #9B7209;
  --tree-transition: 200ms ease;
}

/* Category Tree Container */
.category-tree-sidebar {
  background: var(--tree-bg);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
  border: 1px solid var(--tree-border);
}

.category-tree-header {
  padding: 1rem 1.25rem;
  background: linear-gradient(to bottom, #f9fafb, #ffffff);
  border-bottom: 1px solid var(--tree-border);
}

.category-tree-title {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--tree-text);
}

/* Tree List */
.category-tree-list {
  list-style: none;
  margin: 0;
  padding: 0.5rem 0;
}

.category-tree-item {
  position: relative;
  margin: 0;
}

/* Hide checkbox (used for toggle state) */
.category-toggle {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

/* Category Container */
.category-container {
  display: flex;
  align-items: center;
  position: relative;
  padding: 0;
}

/* Category Link */
.category-link {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1rem;
  color: var(--tree-text);
  text-decoration: none;
  font-size: 0.875rem;
  transition: all var(--tree-transition);
  border-left: 3px solid transparent;
  position: relative;
}

.category-link:hover {
  background: var(--tree-hover-bg);
  color: var(--tree-gold-dark);
}

.category-link:focus {
  outline: 2px solid var(--tree-gold);
  outline-offset: -2px;
  z-index: 1;
}

/* Active category (current page) */
.category-link.active {
  background: var(--tree-active-bg);
  color: var(--tree-gold-dark);
  font-weight: 600;
  border-left-color: var(--tree-active-border);
}

/* On path to current (parent categories) */
.category-tree-item.on-path > .category-container > .category-link {
  font-weight: 500;
  color: var(--tree-gold-dark);
}

/* Category Icon - SVG icons */
.category-icon {
  width: 1.125rem;
  height: 1.125rem;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--tree-text);
}

.category-icon svg {
  width: 100%;
  height: 100%;
  display: block;
  stroke: currentColor;
}

.category-link.active .category-icon {
  color: var(--tree-gold-dark);
}

.category-link:hover .category-icon {
  color: var(--tree-gold);
}

/* Category Name */
.category-name {
  flex: 1;
  line-height: 1.4;
}

/* Category Count (number of offerings) */
.category-count {
  font-size: 0.75rem;
  color: #9ca3af;
  font-weight: 500;
  margin-left: auto;
  padding: 0.125rem 0.375rem;
  background: #f3f4f6;
  border-radius: 10px;
  flex-shrink: 0;
}

.category-link.active .category-count {
  background: rgba(184, 134, 11, 0.15);
  color: var(--tree-gold-dark);
}

/* Toggle Button */
.category-toggle-btn {
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border-radius: 4px;
  transition: all var(--tree-transition);
  margin-right: 0.25rem;
  color: #9ca3af;
}

.category-toggle-btn:hover {
  background: var(--tree-hover-bg);
  color: var(--tree-gold);
}

.category-toggle-btn:focus {
  outline: 2px solid var(--tree-gold);
  outline-offset: 2px;
}

.toggle-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.25rem;
  height: 1.25rem;
  transition: transform 0.3s ease;
  color: #9ca3af;
}

.toggle-icon svg {
  width: 0.875rem;
  height: 0.875rem;
  display: block;
  stroke: currentColor;
  stroke-width: 2.5;
}

.category-toggle-btn:hover .toggle-icon {
  color: var(--tree-gold);
}

/* Rotate icon when expanded */
.category-toggle:checked + .category-container .toggle-icon {
  transform: rotate(90deg);
}

/* Children List */
.category-children {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: all 0.3s ease;
  background: #fafafa;
}

/* Show children when expanded */
.category-toggle:checked ~ .category-children {
  max-height: 2000px;
  opacity: 1;
  padding: 0.25rem 0;
}

/* Indent nested categories */
.category-children .category-link {
  padding-left: calc(1rem + var(--tree-indent));
}

.category-children .category-children .category-link {
  padding-left: calc(1rem + var(--tree-indent) * 2);
}

.category-children .category-children .category-children .category-link {
  padding-left: calc(1rem + var(--tree-indent) * 3);
}

.category-children .category-children .category-children .category-children .category-link {
  padding-left: calc(1rem + var(--tree-indent) * 4);
}

/* Visual hierarchy with different backgrounds */
.category-children {
  background: #fafafa;
}

.category-children .category-children {
  background: #f5f5f5;
}

.category-children .category-children .category-children {
  background: #f0f0f0;
}

/* Responsive Adjustments */
@media (max-width: 992px) {
  .category-tree-sidebar {
    margin-bottom: 1.5rem;
  }

  .category-link {
    font-size: 0.9375rem;
    padding: 0.75rem 1rem;
  }
}

/* Print Styles */
@media print {
  .category-tree-sidebar {
    display: none;
  }
}