:root { 
            --accent-color: #c97e3a;
            --light-gray: #f8f4ef;
            --border-color: #e2dcd5;
            --text-muted: #6c6863;
        }
    .author-bio{display:block}
        .math-box, .deep-dive, .canvas-compare {
            display: flex;
            flex-wrap: wrap;
            gap: 2rem;
            justify-content: center;
            margin: 1.5rem 0;
        }
        .canvas-panel {
            flex: 1;
            min-width: 260px;
            text-align: center;
            background: #fefaf5;
            border-radius: 28px;
            padding: 1rem;
            box-shadow: 0 5px 12px rgba(0,0,0,0.05);
        }
        .canvas-panel canvas {
            width: 100%;
            height: auto;
            border-radius: 20px;
            background: #eae3da;
            box-shadow: 0 6px 14px rgba(0,0,0,0.1);
            max-height: 400px;
            object-fit: contain;
        }
        .slider-label {
            font-weight: 500;
            margin-top: 0.8rem;
        }
        .legend-item {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            margin-right: 1.2rem;
        }
        .btn-oil {
            background: var(--primary-color);
            color: white;
            border: none;
            transition: 0.2s;
        }
        .btn-oil:hover {
            background: #ad6b34;
        }
        .example-sample {
            cursor: pointer;
            transition: 0.2s;
        }
        .example-sample:hover {
            opacity: 0.8;
            transform: scale(0.98);
        }
        button:disabled {
            opacity: 0.6;
        }
        .related-tools-container @media (max-width: 768px) {
            .canvas-compare { flex-direction: column; }
        }
        .brush-value {
            font-weight: 600;
            background: #e9ecef;
            padding: 2px 10px;
            border-radius: 30px;
            font-size: 0.9rem;
        }