/* ===== Folder Tree Panel ===== */
.folder-tree-panel {
    width: 250px;
    min-width: 150px;
    background: var(--bg-secondary);
    border-right: none;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    flex-shrink: 0;
}

.tree-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 8px 12px;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
}

.tree-header-status {
    color: var(--text-secondary);
    font-size: 10px;
    letter-spacing: 0;
}

.tree-header-status.warning {
    color: #d6b35f;
}

.tree-container {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 4px 0;
}

/* ===== Tree Node ===== */
.tree-node {
    user-select: none;
}

.tree-node-row {
    display: flex;
    align-items: center;
    padding: 2px 8px;
    cursor: pointer;
    white-space: nowrap;
    font-size: 13px;
    height: 24px;
    transition: background 0.1s;
}

.tree-node-row:hover {
    background: var(--bg-hover);
}

.tree-node-row.selected {
    background: var(--bg-active);
}

.tree-node-row.active {
    background: var(--bg-active);
}

.tree-indent {
    display: inline-block;
    width: 16px;
    flex-shrink: 0;
}

.tree-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    font-size: 10px;
    color: var(--text-secondary);
    transition: transform 0.15s;
}

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

.tree-toggle.leaf {
    visibility: hidden;
}

.tree-icon {
    margin-right: 4px;
    font-size: 14px;
    flex-shrink: 0;
}

.tree-label {
    overflow: hidden;
    text-overflow: ellipsis;
}

.tree-node-badge {
    margin-left: auto;
    padding: 1px 6px;
    border-radius: 999px;
    background: rgba(0, 122, 204, 0.16);
    color: var(--text-accent);
    font-size: 10px;
    line-height: 1.5;
}

.tree-node-badge-warning {
    background: rgba(255, 166, 0, 0.16);
    color: #d6b35f;
}

.tree-children {
    overflow: hidden;
}

.tree-children.collapsed {
    display: none;
}

.tree-node-checkbox {
    margin-right: 4px;
    accent-color: var(--border-focus);
    flex-shrink: 0;
}

.tree-file-info {
    display: flex;
    align-items: center;
    padding: 1px 8px;
    height: 20px;
    white-space: nowrap;
    user-select: none;
}

.tree-file-count-label {
    font-size: 11px;
    color: var(--text-secondary);
    opacity: 0.7;
    font-style: italic;
}

.tree-file-info-warning .tree-file-count-label {
    color: #d6b35f;
    opacity: 1;
}