margin: 5px 0;
            border: 1px solid #e0e0e0;
            border-radius: 4px;
            cursor: pointer;
            transition: all 0.2s;
        }
        .measure-item:hover {
            background: #f0f0f0;
            border-color: #007bff;
        }
        .measure-item.selected {
            background: #007bff;
            color: white;
            border-color: #0056b3;
        }
        .category-header {
            font-weight: bold;
            color: #333;
            margin-top: 1