.canvas-preview {
            background: #f1f3f5;
            border-radius: 20px;
            padding: 1rem;
            text-align: center;
            border: 1px solid #e9ecef;
        }
        .canvas-preview canvas {
            max-width: 100%;
            height: auto;
            border-radius: 16px;
            box-shadow: 0 6px 14px rgba(0,0,0,0.1);
            background: white;
        }
        .slider-label {
            font-weight: 600;
            margin-bottom: 0.25rem;
        }
        .param-row {
            margin-bottom: 1.2rem;
        }
        .legend {
            display: flex;
            justify-content: center;
            gap: 1.2rem;
            margin-top: 0.8rem;
            font-size: 0.8rem;
        }