: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;
            --danger-color: #dc3545;
            --roi-color: #6f42c1;
            --profit-color: #20c997;
        }
     .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);
        }
        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(44, 125, 160, 0.15);
        }
        .roi-positive {
            color: var(--success-color);
        }
        .roi-negative {
            color: var(--danger-color);
        }
        .roi-neutral {
            color: var(--warning-color);
        }
        .kpi-card {
            background: white;
            border-radius: 8px;
            padding: 1.25rem;
            border: 1px solid var(--border-color);
            text-align: center;
            height: 100%;
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
        }
        .kpi-value {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 0.25rem;
        }
        .kpi-label {
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        .formula-box {
            background-color: rgba(111, 66, 193, 0.05);
            border-left: 3px solid var(--roi-color);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
        }
        @media (max-width: 768px) {
            }
        .calculation-step {
            margin-bottom: 1.5rem;
            padding-bottom: 1.5rem;
            border-bottom: 1px dashed var(--border-color);
        }
        .scenario-examples {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .scenario-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;
        }
        .scenario-btn:hover {
            background-color: rgba(44, 125, 160, 0.2);
            transform: translateY(-2px);
        }
        .metric-card {
            border-radius: 8px;
            padding: 1.25rem;
            margin-bottom: 1rem;
            border: 1px solid var(--border-color);
        }
        .metric-value {
            font-size: 1.5rem;
            font-weight: 700;
        }
        .metric-label {
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        .metric-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
        }
        .metric-table th, .metric-table td {
            padding: 0.75rem;
            text-align: left;
            border: 1px solid var(--border-color);
        }
        .metric-table th {
            background-color: var(--light-gray);
            font-weight: 600;
        }
        .metric-table tr:nth-child(even) {
            background-color: rgba(44, 125, 160, 0.05);
        }
        .profit-indicator {
            display: inline-flex;
            align-items: center;
            padding: 0.25rem 0.75rem;
            border-radius: 20px;
            font-size: 0.9rem;
            font-weight: 600;
        }
        .profit-positive {
            background-color: rgba(40, 167, 69, 0.1);
            color: var(--success-color);
        }
        .profit-negative {
            background-color: rgba(220, 53, 69, 0.1);
            color: var(--danger-color);
        }
        .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: 20px;
            border-radius: 4px;
            margin-right: 0.5rem;
        }
        .investment-color {
            background-color: rgba(44, 125, 160, 0.8);
        }
        .revenue-color {
            background-color: rgba(32, 201, 151, 0.8);
        }
        .profit-color {
            background-color: rgba(111, 66, 193, 0.8);
        }