.input-group-custom {
            margin-bottom: 1rem;
        }.author-bio{display:block}
        .deep-dive {
            margin: 1.8rem 0;
        }
        .coeff-grid {
            display: grid;
            grid-template-columns: auto 1fr auto 1fr auto 1fr;
            gap: 0.5rem;
            align-items: center;
            margin-bottom: 1rem;
        }
        .coeff-grid-3d {
            display: grid;
            grid-template-columns: repeat(6, auto) 1fr;
            gap: 0.5rem;
            align-items: center;
        }
        .equation-row {
            margin-bottom: 0.75rem;
            align-items: center;
        }
        .tab-content {
            padding-top: 1.2rem;
        }
        .system-badge {
            background-color: rgba(70,130,180,0.1);
            padding: 0.3rem 0.8rem;
            border-radius: 20px;
            display: inline-block;
            font-size: 0.8rem;
        }
        .canvas-container {
            text-align: center;
            margin-top: 1rem;
            background-color: #fafafc;
            border-radius: 12px;
        }
        .geometry-canvas {
            width: 100%;
            height: auto;
            background-color: #ffffff;
            border: 1px solid #ddd;
            border-radius: 8px;
            margin-top: 0.5rem;
        }
        .legend {
            display: flex;
            justify-content: center;
            gap: 1.8rem;
            margin: 0.5rem 0;
            font-size: 0.85rem;
        }
        .legend-item {
            display: flex;
            align-items: center;
            gap: 0.3rem;
        }
        .legend-color {
            width: 16px;
            height: 16px;
            border-radius: 2px;
        }
        .legend-color.red { background-color: #dc3545; width: 18px; }
        .legend-color.blue { background-color: #0d6efd; }
        .matrix-vis {
            background: #f8f9fa;
            padding: 1rem;
            font-family: monospace;
            border-radius: 10px;
        }
        .test-badge {
            background-color: #d1e7dd;
            color: #0f5132;
            padding: 0.2rem 0.5rem;
            border-radius: 20px;
            font-size: 0.8rem;
            display: inline-block;
        }
        .warning-badge {
            background-color: #fff3cd;
            color: #856404;
            font-size: 0.8rem;
            border-radius: 12px;
            padding: 0.2rem 0.6rem;
            margin-left: 0.5rem;
        }