:root {
            --primary: #2c7da0;
            --primary-dark: #1e6091;
            --secondary: #61a5c2;
            --light-bg: #f8fafc;
        }
        .integral-expression {
            font-size: 1.3rem;
            font-weight: 500;
            color: var(--primary);
            background: #eef6fc;
            padding: 10px 18px;
            border-radius: 16px;
            font-family: 'SF Mono', 'Courier New', monospace;
            word-break: break-word;
        }
        .graph-container {
            margin-top: 1.8rem;
        }
        .function-canvas {
            width: 100%;
            max-width: 800px;
            height: auto;
            background: #fff;
            border-radius: 1.5rem;
            box-shadow: 0 4px 12px rgba(0,0,0,0.05);
            border: 1px solid #e9edf2;
        }
        .legend-color {
            width: 20px;
            height: 20px;
            display: inline-block;
            border-radius: 4px;
            margin-right: 8px;
            vertical-align: middle;
        }
        .legend-color.func { background: #1e466e; }
        .legend-color.antideriv { background: #2e8b57; }
        .legend-color.grid { background: #b9c8e0; }
        .slider-custom {
            width: 100%;
            margin: 0.5rem 0;
        }
        .badge-c {
            background: #e9ecef;
            color: #2c3e50;
            font-family: monospace;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            }