.limit-expression {
            font-size: 1.25rem;
            font-weight: 500;
            color: var(--primary-color);
            background: #f8f9fa;
            padding: 8px 12px;
            border-radius: 6px;
        }
        .graph-container {
            margin-top: 1.5rem;
            text-align: center;
        }
        .function-canvas {
            width: 100%;
            height: auto;
            background: #fefefe;
            border: 1px solid #ddd;
            border-radius: 12px;
            box-shadow: 0 2px 6px rgba(0,0,0,0.05);
        }
        .legend {
            display: flex;
            justify-content: center;
            gap: 1.5rem;
            margin-top: 0.6rem;
            font-size: 0.85rem;
        }
        .legend-color {
            width: 18px;
            height: 18px;
            display: inline-block;
            border-radius: 2px;
            margin-right: 6px;
            vertical-align: middle;
        }
        .legend-color.original { background-color: #2c3e50; border-radius: 4px; }
        .legend-color.point { background-color: #e74c3c; border-radius: 50%; width: 12px; height: 12px; margin-right: 8px; }
        .legend-color.grid { background-color: #ccc; }
        .legend-color.asymptote { background-color: #ff6b6b; border-radius: 2px; }
        .limit-symbol {
            font-size: 1.3rem;
            font-family: 'Times New Roman', serif;
        }
        .badge-direction {
            font-size: 0.8rem;
            vertical-align: middle;
            margin-left: 8px;
        }