.geometry-canvas {
            width: 100%;
            height: auto;
            background-color: #f9f9f9;
            border: 1px solid #ddd;
            border-radius: 8px;
            margin-top: 1rem;
        }
        .canvas-container {
            text-align: center;
            margin-top: 1rem;
        }
        .legend {
            display: flex;
            justify-content: center;
            gap: 2rem;
            margin-top: 0.5rem;
            font-size: 0.85rem;
        }
        .legend-color {
            width: 16px;
            height: 16px;
            border-radius: 2px;
            display: inline-block;
        }
        .mode-switch {
            margin-bottom: 1.2rem;
            padding: 0.8rem;
            background: #f1f5f9;
            border-radius: 48px;
            display: inline-flex;
            gap: 1rem;
        }
        .mode-btn {
            cursor: pointer;
            padding: 0.4rem 1.5rem;
            border-radius: 32px;
            transition: 0.2s;
            font-weight: 500;
        }
        .mode-active {
            background: var(--primary-color);
            color: white;
        }
        .custom-compound {
            margin-top: 0.5rem;
        }