/* 🌲 R2 폴더 트리 뷰 스타일 */
          .r2-tree-container {
            user-select: none;
            font-size: 0.82rem;
            color: #334155;
          }
          .r2-tree-node {
            display: flex;
            align-items: center;
            padding: 4px 6px;
            border-radius: 6px;
            cursor: pointer;
            transition: all 0.15s ease;
            gap: 4px;
            margin-bottom: 1px;
          }
          .r2-tree-node:hover {
            background-color: #e2e8f0;
            color: #0f172a;
          }
          .r2-tree-node.is-active {
            background-color: #0284c7 !important;
            color: #ffffff !important;
            font-weight: 700;
          }
          .r2-tree-node.is-active .r2-tree-icon {
            color: #ffffff;
          }
          .r2-tree-toggle {
            width: 18px;
            height: 18px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 0.70rem;
            color: #64748b;
            border-radius: 4px;
            cursor: pointer;
            transition: transform 0.15s;
          }
          .r2-tree-toggle:hover {
            background: rgba(0,0,0,0.06);
          }
          .r2-tree-toggle.is-empty {
            visibility: hidden;
          }
          .r2-tree-children {
            padding-left: 16px;
            border-left: 1px dashed #cbd5e1;
            margin-left: 8px;
          }