:root {
            --primary-color: #2c7da0;
            --secondary-color: #a9d6e5;
            --accent-color: #01497c;
            --light-gray: #f8f9fa;
            --border-color: #eaeaea;
            --text-color: #333;
            --text-muted: #6c757d;
            --success-color: #28a745;
            --warning-color: #ffc107;
            --epi-color: #6f42c1;
            --infectious-color: #e83e8c;
        }
        .page-header {
            background: linear-gradient(135deg, rgba(169, 214, 229, 0.4) 0%, rgba(44, 125, 160, 0.4) 100%);
            padding: 1.5rem 0;
            margin-bottom: 2rem;
            border-bottom: 1px solid rgba(44, 125, 160, 0.2);
            position: relative;
            overflow: hidden;  color: var(--text-color);
        }
        .breadcrumb {
            background-color: transparent;
            padding: 0.5rem 0;
            margin-bottom: 0.5rem;
        }
        .breadcrumb-item a {
            color: var(--text-muted);
            text-decoration: none;
        }
        .breadcrumb-item.active {
            color: var(--text-color);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 1rem;
            margin: 1.5rem 0;
        }
        .stat-card {
            background: white;
            padding: 1rem;
            border-radius: 6px;
            border: 1px solid var(--border-color);
            text-align: center;
        }
        .stat-value {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary-color);
            line-height: 1.2;
        }
        .stat-label {
            color: var(--text-muted);
            font-size: 0.9rem;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }
        .stat-note {
            font-size: 0.8rem;
            color: var(--text-muted);
        }
        .epi-box {
            background-color: rgba(111, 66, 193, 0.05);
            border-left: 3px solid var(--epi-color);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
        }
        .preset-examples {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .preset-btn {
            background-color: rgba(44, 125, 160, 0.1);
            border: 1px solid rgba(44, 125, 160, 0.2);
            border-radius: 4px;
            padding: 0.5rem 0.75rem;
            font-size: 0.9rem;
            color: var(--primary-color);
            cursor: pointer;
            transition: all 0.2s;
        }
        .preset-btn:hover {
            background-color: rgba(44, 125, 160, 0.2);
            transform: translateY(-2px);
        }
        .graph-legend {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 1.5rem;
            margin-top: 1rem;
        }
        .legend-item {
            display: flex;
            align-items: center;
        }
        .legend-color {
            width: 20px;
            height: 4px;
            margin-right: 0.5rem;
        }
        .legend-sus { background-color: #2c7da0; }
        .legend-exp { background-color: #ffc107; }
        .legend-inf { background-color: #e83e8c; }
        .legend-rec { background-color: #28a745; }
        .derivative-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
        }
        .derivative-table th, .derivative-table td {
            padding: 0.75rem;
            text-align: left;
            border: 1px solid var(--border-color);
        }
        .derivative-table th {
            background-color: var(--light-gray);
            font-weight: 600;
        }
        .derivative-table tr:nth-child(even) {
            background-color: rgba(44, 125, 160, 0.05);
        }