: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;
            --medical-red: #dc3545;
            --medical-green: #198754;
            --medical-yellow: #ffc107;
            --medical-orange: #fd7e14;
            --lung-color: #0d6efd;
            --lung-light: #6ea8fe;
            --lung-dark: #0a58ca;
        }
         
        .page-header {
            background: linear-gradient(135deg, rgba(13, 110, 253, 0.1) 0%, rgba(10, 88, 202, 0.1) 100%);
            padding: 1.5rem 0;
            margin-bottom: 2rem;
            border-bottom: 1px solid rgba(13, 110, 253, 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);
        }
         
        .result-title {
            font-weight: 600;
            margin-bottom: 0.75rem;
            color: var(--lung-color);
        }
        
        /* Risk Level Cards */
        .risk-level-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);
        }
        
        .risk-low {
            border-left: 5px solid var(--medical-green);
        }
        
        .risk-moderate {
            border-left: 5px solid var(--medical-yellow);
        }
        
        .risk-high {
            border-left: 5px solid var(--medical-orange);
        }
        
        .risk-very-high {
            border-left: 5px solid var(--medical-red);
        }
        
        .risk-value {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
        }
        
        .risk-label {
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        
        /* Lung Cancer Types */
        .cancer-types {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 0.5rem;
            margin: 1.5rem 0;
        }
        
        .cancer-type {
            background: white;
            border-radius: 6px;
            padding: 1rem;
            border: 1px solid var(--border-color);
            text-align: center;
            position: relative;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .cancer-type:hover {
            transform: translateY(-3px);
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        }
        
        .cancer-type.active {
            border: 2px solid var(--lung-color);
            background-color: rgba(13, 110, 253, 0.05);
        }
        
        .cancer-type-name {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 0.25rem;
        }
        
        .cancer-type-desc {
            font-size: 0.85rem;
            color: var(--text-muted);
        }
        
        /* Risk Factors Grid */
        .risk-factors-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1rem;
            margin: 1.5rem 0;
        }
        
        .risk-factor-card {
            background: white;
            border-radius: 8px;
            padding: 1.25rem;
            border: 1px solid var(--border-color);
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
            display: flex;
            flex-direction: column;
        }
        
        .risk-factor-card.high-risk {
            border: 2px solid var(--medical-red);
            background-color: rgba(220, 53, 69, 0.05);
        }
        
        .risk-factor-card.moderate-risk {
            border: 2px solid var(--medical-yellow);
            background-color: rgba(255, 193, 7, 0.05);
        }
        
        .risk-factor-card.low-risk {
            border: 2px solid var(--medical-green);
            background-color: rgba(40, 167, 69, 0.05);
        }
        
        .risk-factor-title {
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--text-color);
            display: flex;
            align-items: center;
        }
        
        .risk-factor-icon {
            margin-right: 0.5rem;
            font-size: 1.2rem;
        }
        
        .risk-factor-score {
            font-size: 1.25rem;
            font-weight: 700;
            margin-top: 0.5rem;
        }
        
        .risk-factor-desc {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-top: 0.5rem;
        }
        
        /* Chart Container */
        .chart-container {
            position: relative;
            height: 400px;
            width: 100%;
            margin: 2rem 0;
        }
        
        /* Content Sections */
        .section-title {
            font-weight: 600;
            margin-bottom: 1rem;
            color: var(--lung-color);
            padding-bottom: 0.5rem;
            border-bottom: 1px solid var(--border-color);
        }
        
        .usage-step {
            display: flex;
            margin-bottom: 1.5rem;
            align-items: flex-start;
        }
        
        .step-number {
            width: 28px;
            height: 28px;
            background-color: var(--lung-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 1rem;
            flex-shrink: 0;
            font-weight: 600;
            font-size: 0.9rem;
        }
        
        .info-box {
            background-color: rgba(110, 168, 254, 0.1);
            border-left: 3px solid var(--lung-color);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
        }
        
        .medical-info-box {
            background-color: rgba(220, 53, 69, 0.05);
            border-left: 3px solid var(--medical-red);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
        }
        
        .prevention-box {
            background-color: rgba(13, 110, 253, 0.05);
            border-left: 3px solid var(--lung-light);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
        }
         
        /* Responsive Adjustments */
        @media (max-width: 768px) {
 
            .risk-factors-grid {
                grid-template-columns: 1fr;
            }
            
            .cancer-types {
                grid-template-columns: repeat(2, 1fr);
            }
        }
         
        /* Reference table */
        .reference-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
        }
        
        .reference-table th, .reference-table td {
            padding: 0.75rem;
            text-align: left;
            border: 1px solid var(--border-color);
        }
        
        .reference-table th {
            background-color: var(--light-gray);
            font-weight: 600;
        }
        
        .reference-table tr:nth-child(even) {
            background-color: rgba(13, 110, 253, 0.05);
        }
         
        /* Risk Score Bar */
        .risk-score-bar {
            width: 100%;
            height: 20px;
            background-color: #e9ecef;
            border-radius: 10px;
            margin: 1.5rem 0;
            overflow: hidden;
            position: relative;
        }
        
        .risk-score-fill {
            height: 100%;
            border-radius: 10px;
            transition: width 1s ease-in-out;
        }
        
        .risk-marker {
            position: absolute;
            top: -25px;
            transform: translateX(-50%);
            font-size: 0.8rem;
            font-weight: 600;
        }
        
        .risk-marker::after {
            content: '';
            position: absolute;
            top: 20px;
            left: 50%;
            transform: translateX(-50%);
            width: 2px;
            height: 10px;
            background-color: var(--text-muted);
        }
        
        /* Prevention Tips */
        .prevention-tips {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1rem;
            margin: 1.5rem 0;
        }
        
        .prevention-tip {
            background: white;
            border-radius: 8px;
            padding: 1.25rem;
            border: 1px solid var(--border-color);
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
            display: flex;
            align-items: flex-start;
        }
        
        .prevention-icon {
            width: 48px;
            height: 48px;
            border-radius: 8px;
            background-color: rgba(110, 168, 254, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 1rem;
            color: var(--lung-light);
            font-size: 1.25rem;
            flex-shrink: 0;
        }
        
        .prevention-title {
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--text-color);
        }
        
        .prevention-desc {
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        
        /* Form Range Custom */
        .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(--lung-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(--lung-color);
            color: white;
            padding: 0.25rem 0.5rem;
            border-radius: 4px;
            font-size: 0.8rem;
            margin-left: 0.5rem;
        }
        
        /* Risk Chart Styling */
        .risk-chart-container {
            position: relative;
            height: 350px;
            width: 100%;
            margin: 1.5rem 0;
        }
        
        /* Collapsible section styles */
        .collapsible-section {
            margin: 1.5rem 0;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            overflow: hidden;
        }
        
        .collapsible-header {
            background-color: var(--light-gray);
            padding: 1rem 1.5rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-bottom: 1px solid transparent;
            transition: background-color 0.3s;
        }
        
        .collapsible-header:hover {
            background-color: rgba(13, 110, 253, 0.05);
        }
        
        .collapsible-header.active {
            border-bottom: 1px solid var(--border-color);
        }
        
        .collapsible-content {
            padding: 1.5rem;
            display: none;
        }
        
        .collapsible-content.show {
            display: block;
        }
        
        .collapsible-icon {
            transition: transform 0.3s;
        }
        
        .collapsible-header.active .collapsible-icon {
            transform: rotate(180deg);
        }
        
        /* Smoking History Calculator */
        .smoking-calculator {
            background-color: rgba(13, 110, 253, 0.05);
            border-radius: 8px;
            padding: 1.5rem;
            margin: 1.5rem 0;
            border: 1px solid rgba(13, 110, 253, 0.2);
        }
        
        /* Pack-Year Calculator */
        .pack-year-calculator {
            background-color: rgba(220, 53, 69, 0.05);
            border-radius: 8px;
            padding: 1.5rem;
            margin: 1.5rem 0;
            border: 1px solid rgba(220, 53, 69, 0.2);
        }