.collatz-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            margin: 1rem 0;
        }
        .stat-card {
            background: var(--light-gray, #f8f9fa);
            border-radius: 8px;
            padding: 0.8rem 1.2rem;
            flex: 1;
            min-width: 120px;
            text-align: center;
            border-left: 4px solid var(--primary-color, #0d6efd);
        }
        .stat-value {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary-color);
        }
        .sequence-box {
            background-color: #f1f3f5;
            max-height: 200px;
            overflow-y: auto;
            font-family: monospace;
            font-size: 0.85rem;
            padding: 1rem;
            border-radius: 8px;
            white-space: pre-wrap;
            word-break: break-all;
        }
        canvas#collatzChart {
            width: 100%;
            height: auto;
            background: #fefefe;
        }
        .btn-sm-icon {
            padding: 0.25rem 0.5rem;
            font-size: 0.8rem;
        }
        .legend-chart {
            display: flex;
            justify-content: center;
            gap: 1rem;
            margin-top: 0.5rem;
            font-size: 0.8rem;
        }
        .deep-dive {
            margin: 1.8rem 0;
            text-align: justify;
        }
        .property-table td, .record-badge {
            background-color: #e9ecef;
            border-radius: 20px;
            padding: 0.1rem 0.6rem;
            font-size: 0.7rem;
            font-weight: 500;
        }