/* ============================================
   Element Tree Styles
   ============================================ */

#element-tree {
    height: 100%;
    overflow-y: auto;
    padding: 16px;
}

/* Empty State */
.tree-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    text-align: center;
    color: #9ca3af;
}

.tree-empty-icon {
    font-size: 48px;
    margin-bottom: 12px;
    opacity: 0.5;
}

.tree-empty-state p {
    font-size: 14px;
    margin: 0;
}

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

.tree-node-li {
    margin-bottom: 4px;
}

/* Tree Node */
.tree-node {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 13px;
    user-select: none;
}

.tree-node:hover {
    background: #f9fafb;
}

.tree-node.selected {
    background: #dbeafe;
    color: #1e40af;
    font-weight: 500;
}

/* Tree Toggle */
.tree-toggle {
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 10px;
    color: #9ca3af;
    transition: transform 0.2s ease;
}

.tree-node-li.expanded > .tree-node .tree-toggle {
    transform: rotate(90deg);
}

/* Tree Icon */
.tree-icon {
    flex-shrink: 0;
    font-size: 16px;
    line-height: 1;
}

/* Tree Label */
.tree-label {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Tree Badge */
.tree-badge {
    font-size: 10px;
    padding: 2px 6px;
    background: #f3f4f6;
    border-radius: 3px;
    color: #6b7280;
    font-weight: 500;
}

/* Tree Children */
.tree-children {
    list-style: none;
    padding-left: 24px;
    margin: 4px 0 0 0;
    display: none;
}

.tree-node-li.expanded > .tree-children {
    display: block;
}

/* Node Types */
.tree-node-container {
    font-weight: 500;
}

.tree-node-column {
    font-weight: 500;
    color: #4b5563;
}

.tree-node-element {
    font-weight: 400;
}

/* Readonly Badge */
.tree-node-readonly {
    background: rgba(251, 191, 36, 0.05);
}

.tree-readonly-badge {
    font-size: 12px;
    color: #f59e0b;
}

/* Scrollbar */
#element-tree::-webkit-scrollbar {
    width: 6px;
}

#element-tree::-webkit-scrollbar-track {
    background: transparent;
}

#element-tree::-webkit-scrollbar-thumb {
    background: #d1d5db;
    border-radius: 3px;
}

#element-tree::-webkit-scrollbar-thumb:hover {
    background: #9ca3af;
}