.chart-container {
            background: white;
            border-radius: 12px;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
            padding: 25px;
            width: 280px;
            max-width: 90%;
            margin: 0 auto;
        }

        .title {
            text-align: center;
            font-size: 14px;
            margin-bottom: 25px;
            color: #2c3e50;
            font-weight: 600;
            padding-bottom: 15px;
            border-bottom: 2px solid #eee;
        }

        .node {
            cursor: pointer;
            margin-left: 10px;
            position: relative;
            transition: all 0.3s ease;
        }

        .node:hover {
            background-color: rgba(52, 152, 219, 0.05);
            border-radius: 4px;
        }

        .node--internal>.node-content {
            font-weight: 600;
            color: #2c3e50;
        }

        .node--leaf>.node-content {
            color: #34495e;
            margin-left: 10px;
        }

        .node-content {
            display: flex;
            align-items: center;
            padding: 6px 10px;
            border-radius: 4px;
            transition: background-color 0.2s;
        }

        .node-content:hover {
            background-color: #f8f9fa;
        }

        .toggle {
            display: inline-block;
            width: 0;
            height: 0;
            margin-right: 10px;
            cursor: pointer;
            transition: transform 0.3s ease;
        }

        .toggle--down {
            border-left: 6px solid transparent;
            border-right: 6px solid transparent;
            border-top: 10px solid #3498db;
        }

        /* .toggle--right {
            border-top: 6px solid transparent;
            border-bottom: 6px solid transparent;
            border-left: 10px solid #95a5a6;
        } */
        .children {
            margin-left: 10px;
            border-left: 2px solid #ecf0f1;
            transition: all 0.3s ease;
        }

        .collapsed .children {
            display: none;
        }

        .collapsed .toggle--down {
            transform: rotate(-90deg);
        }

        .count-badge {
            background-color: #3498db;
            color: white;
            padding: 2px 8px;
            border-radius: 12px;
            font-size: 12px;
            margin-left: 8px;
            font-weight: normal;
        }

        .node--leaf .count-badge {
            background-color: #7f8c8d;
        }

        .selected {
            background-color: #e0f0ff;
            border-radius: 3px;
        }

        .search-container {
            margin-bottom: 20px;
            display: flex;
            gap: 10px;
        }

        .search-input {
            flex: 1;
            padding: 10px 15px;
            border: 1px solid #ddd;
            border-radius: 6px;
            font-size: 14px;
            transition: border-color 0.3s;
        }

        .search-input:focus {
            outline: none;
            border-color: #3498db;
            box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
        }

        .btn {
            padding: 10px 15px;
            background: #3498db;
            color: white;
            border: none;
            border-radius: 6px;
            cursor: pointer;
            font-size: 14px;
            transition: background 0.3s;
        }

        .btn:hover {
            background: #2980b9;
        }

        .stats {
            text-align: center;
            margin-top: 20px;
            padding-top: 15px;
            border-top: 1px solid #eee;
            color: #7f8c8d;
            font-size: 14px;
        }