.graph-canvas {
            width: 100%;
            background: #fefefe;
            border: 1px solid #dee2e6;
            border-radius: 12px;
            margin-top: 1rem;
            box-shadow: 0 2px 5px rgba(0,0,0,0.05);
        }
        .legend {
            display: flex;
            justify-content: center;
            gap: 1.5rem;
            margin-top: 0.5rem;
        }
        .legend-color {
            width: 18px;
            height: 18px;
            border-radius: 2px;
        }
        .legend-color.curve { background-color: #0d6efd; }
        .legend-color.point { background-color: #dc3545; border-radius: 50%; }
        .coord-input {
            margin-bottom: 0.75rem;
        }
        .card-buffer {
            background: #f8f9fc;
            border-radius: 16px;
        }
        .input-group-custom {
            margin-bottom: 1rem;
        }
        .author-badge {
            background: #eef2fa;
            padding: 1.2rem;
            border-radius: 12px;
        }
        .chemistry-fact {
            background: #e8f0fe;
            border-radius: 20px;
            padding: 1rem;
        }
        .range-warning {
            font-size: 0.85rem;
            margin-top: 0.5rem;
        }