: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;
        }
    
        .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);
        }
    
        .summary-card {
            background: white;
            border-radius: 8px;
            padding: 1.5rem;
            border: 1px solid var(--border-color);
            margin-bottom: 1.5rem;
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
        }
        
        .summary-value {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 0.5rem;
        }
        
        .summary-label {
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        
        /* Chart Container */
        .chart-container {
            position: relative;
            height: 400px;
            width: 100%;
            margin: 2rem 0;
        }
        
        /* Financial Summary */
        .financial-summary {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin: 2rem 0;
        }
        
        .financial-item {
            background: white;
            border-radius: 8px;
            padding: 1.5rem;
            border: 1px solid var(--border-color);
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
        }
        
        .financial-item h4 {
            font-size: 1rem;
            color: var(--text-muted);
            margin-bottom: 0.5rem;
        }
        
        .financial-item .value {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary-color);
        }
        
        .financial-item .detail {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-top: 0.5rem;
        }
         
        /* Responsive Adjustments */
        @media (max-width: 768px) { 
            .financial-summary {
                grid-template-columns: 1fr;
            }
        }
        
        /* Toggle switch for calculation modes */
        .calculation-modes {
            display: flex;
            background-color: var(--light-gray);
            border-radius: 6px;
            padding: 4px;
            margin-bottom: 1.5rem;
            flex-wrap: wrap;
        }
        
        .mode-btn {
            flex: 1;
            text-align: center;
            padding: 0.75rem;
            border-radius: 4px;
            cursor: pointer;
            transition: all 0.3s;
            font-weight: 600;
            min-width: 120px;
            margin: 2px;
        }
        
        .mode-btn.active {
            background-color: var(--primary-color);
            color: white;
        }
        
        /* Range slider styling */
        .form-range {
            width: 100%;
            height: 1rem;
            padding: 0;
            background-color: transparent;
            -webkit-appearance: none;
        }
        
        .form-range:focus {
            outline: none;
        }
        
        .form-range::-webkit-slider-thumb {
            width: 1rem;
            height: 1rem;
            margin-top: -0.5rem;
            background-color: var(--primary-color);
            border: 0;
            border-radius: 1rem;
            -webkit-appearance: none;
        }
        
        .form-range::-webkit-slider-runnable-track {
            width: 100%;
            height: 0.5rem;
            cursor: pointer;
            animate: 0.2s;
            background: var(--light-gray);
            border-radius: 0.5rem;
        }
        
        .slider-value {
            background-color: var(--primary-color);
            color: white;
            padding: 0.25rem 0.5rem;
            border-radius: 4px;
            font-size: 0.8rem;
            margin-left: 0.5rem;
        }
        
        /* Input group styling */
        .input-group {
            margin-bottom: 1rem;
        }
        
        /* Mode-specific form styling */
        .mode-form {
            display: none;
        }
        
        .mode-form.active {
            display: block;
        }
        
        /* Comparison table */
        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
        }
        
        .comparison-table th, .comparison-table td {
            padding: 0.75rem;
            text-align: left;
            border-bottom: 1px solid var(--border-color);
        }
        
        .comparison-table th {
            background-color: var(--light-gray);
            font-weight: 600;
        }
        
        .comparison-table tr:hover {
            background-color: rgba(44, 125, 160, 0.05);
        }
        
        /* Generating indicator */
        .generating-indicator {
            display: none;
            background-color: var(--light-gray);
            padding: 1rem;
            text-align: center;
            border-radius: 6px;
            margin: 1.5rem 0;
        }
        
        /* Vessel diagram */
        .vessel-diagram {
            width: 100%;
            max-width: 300px;
            margin: 1rem auto;
            text-align: center;
        }
        
        .vessel-body {
            width: 80%;
            height: 120px;
            background-color: #e9ecef;
            border-radius: 10px;
            margin: 0 auto;
            position: relative;
            border: 2px solid #adb5bd;
        }
        
        .vessel-head {
            width: 80%;
            height: 40px;
            background-color: #6c757d;
            border-radius: 50% 50% 0 0;
            position: absolute;
            top: -20px;
            left: 10%;
        }
        
        .vessel-nozzle {
            width: 20px;
            height: 20px;
            background-color: #495057;
            border-radius: 50%;
            position: absolute;
            top: 30px;
            right: 10px;
        }
        
        .vessel-support {
            width: 60%;
            height: 10px;
            background-color: #495057;
            position: absolute;
            bottom: -10px;
            left: 20%;
        }
        
        .vessel-label {
            width: 15px;
            height: 15px;
            background-color: var(--primary-color);
            border-radius: 50%;
            position: absolute;
        }
        
        .vessel-diameter {
            top: 20px;
            left: 10px;
        }
        
        .vessel-length {
            bottom: 20px;
            right: 10px;
        }
        
        .vessel-labels {
            display: flex;
            justify-content: space-between;
            margin-top: 10px;
        }
        
        .vessel-label-text {
            font-size: 0.8rem;
            color: var(--text-muted);
        }
        
        /* Vessel head types */
        .vessel-head-types {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 1rem;
            margin: 1.5rem 0;
        }
        
        .vessel-type {
            text-align: center;
            padding: 1rem;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .vessel-type:hover, .vessel-type.active {
            border-color: var(--primary-color);
            background-color: rgba(44, 125, 160, 0.05);
        }
        
        .vessel-type-icon {
            font-size: 2rem;
            color: var(--primary-color);
            margin-bottom: 0.5rem;
        }
        
        /* Material properties table */
        .material-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
        }
        
        .material-table th, .material-table td {
            padding: 0.75rem;
            text-align: left;
            border-bottom: 1px solid var(--border-color);
        }
        
        .material-table th {
            background-color: var(--light-gray);
            font-weight: 600;
        }
        
        .material-table tr:hover {
            background-color: rgba(44, 125, 160, 0.05);
        }
        
        /* Pressure chart */
        .pressure-chart {
            width: 100%;
            height: 300px;
            background-color: white;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            margin: 1rem 0;
            position: relative;
        }
        
        .chart-grid {
            position: absolute;
            width: 100%;
            height: 100%;
            background-image: 
                linear-gradient(to right, rgba(0,0,0,0.05) 1px, transparent 1px),
                linear-gradient(to bottom, rgba(0,0,0,0.05) 1px, transparent 1px);
            background-size: 20px 20px;
        }
        
        .chart-line {
            position: absolute;
            background-color: var(--primary-color);
            height: 2px;
            width: 100%;
            top: 0;
            left: 0;
        }