: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;
            --fitness-green: #198754;
            --fitness-blue: #0d6efd;
            --fitness-orange: #fd7e14;
            --fitness-purple: #6f42c1;
        }
        
    
        /* Summary */
        .fitness-summary {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin: 2rem 0;
        }
        
        .fitness-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);
            text-align: center;
        }
        
        .fitness-item h4 {
            font-size: 1rem;
            color: var(--text-muted);
            margin-bottom: 0.5rem;
        }
        
        .fitness-item .value {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
        }
        
        .fitness-age-value {
            font-size: 3rem;
            font-weight: 800;
            line-height: 1;
        }
        
        .age-younger {
            color: var(--fitness-green);
        }
        
        .age-same {
            color: var(--fitness-blue);
        }
        
        .age-older {
            color: var(--fitness-orange);
        }
        
        .fitness-item .detail {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-top: 0.5rem;
        }
         
        .fitness-info-box {
            background-color: rgba(25, 135, 84, 0.05);
            border-left: 3px solid var(--fitness-green);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
        }
         
        /* Responsive Adjustments */
        @media (max-width: 768px) {
            .tool-card {
                padding: 1.5rem;
            }
            
            .fitness-summary {
                grid-template-columns: 1fr;
            }
        }
        
        /* Tabs for different input methods */
        .input-method-tabs {
            display: flex;
            border-bottom: 1px solid var(--border-color);
            margin-bottom: 1.5rem;
            flex-wrap: wrap;
        }
        
        .input-tab {
            padding: 0.75rem 1.5rem;
            cursor: pointer;
            font-weight: 600;
            border-bottom: 3px solid transparent;
            transition: all 0.3s;
        }
        
        .input-tab.active {
            color: var(--primary-color);
            border-bottom: 3px solid var(--primary-color);
            background-color: rgba(44, 125, 160, 0.05);
        }
        
        .input-tab-content {
            display: none;
        }
        
        .input-tab-content.active {
            display: block;
        }
        
        /* Fitness-specific styling */
        .fitness-alert {
            background-color: rgba(220, 53, 69, 0.1);
            border-left: 4px solid var(--danger-color);
            padding: 1rem;
            margin: 1rem 0;
            border-radius: 0 4px 4px 0;
        }
        
        .good-range {
            color: var(--fitness-green);
            font-weight: 600;
        }
        
        .average-range {
            color: var(--fitness-blue);
            font-weight: 600;
        }
        
        .poor-range {
            color: var(--fitness-orange);
            font-weight: 600;
        }
        
        .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(44, 125, 160, 0.05);
        }
        
        .generating-indicator {
            display: none;
            text-align: center;
            padding: 1rem;
            color: var(--text-muted);
        }
        
        /* Fitness age specific styles */
        .fitness-classification {
            padding: 1rem;
            border-radius: 8px;
            margin: 1rem 0;
            border-left: 5px solid;
        }
        
        .fitness-excellent {
            background-color: rgba(25, 135, 84, 0.1);
            border-left-color: var(--fitness-green);
        }
        
        .fitness-good {
            background-color: rgba(13, 110, 253, 0.1);
            border-left-color: var(--fitness-blue);
        }
        
        .fitness-fair {
            background-color: rgba(255, 193, 7, 0.1);
            border-left-color: var(--warning-color);
        }
        
        .fitness-poor {
            background-color: rgba(253, 126, 20, 0.1);
            border-left-color: var(--fitness-orange);
        }
        
        .fitness-very-poor {
            background-color: rgba(220, 53, 69, 0.1);
            border-left-color: var(--danger-color);
        }
        
        .fitness-chart-container {
            position: relative;
            height: 300px;
            width: 100%;
            margin: 1.5rem 0;
        }
        
        .fitness-status-indicator {
            display: inline-block;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            margin-right: 8px;
        }
        
        .status-excellent {
            background-color: var(--fitness-green);
        }
        
        .status-good {
            background-color: var(--fitness-blue);
        }
        
        .status-fair {
            background-color: var(--warning-color);
        }
        
        .status-poor {
            background-color: var(--fitness-orange);
        }
        
        .status-very-poor {
            background-color: var(--danger-color);
        }
        
        /* Progress bars */
        .fitness-factor-progress {
            margin-bottom: 1rem;
        }
        
        .progress-label {
            display: flex;
            justify-content: space-between;
            margin-bottom: 0.25rem;
        }
        
        .progress-bar-custom {
            height: 10px;
            border-radius: 5px;
            background-color: #e9ecef;
            overflow: hidden;
        }
        
        .progress-fill {
            height: 100%;
            border-radius: 5px;
            transition: width 0.5s ease-in-out;
        }
        
        /* Age comparison */
        .age-comparison {
            display: flex;
            justify-content: space-around;
            align-items: center;
            margin: 2rem 0;
            padding: 2rem;
            background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
            border-radius: 12px;
            border: 1px solid var(--border-color);
        }
        
        .age-box {
            text-align: center;
            padding: 1.5rem;
            border-radius: 8px;
            background-color: white;
            box-shadow: 0 4px 6px rgba(0,0,0,0.05);
            min-width: 150px;
        }
        
        .age-box h4 {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 0.5rem;
        }
        
        .age-box .age-value {
            font-size: 2.5rem;
            font-weight: 800;
            line-height: 1;
        }
        
        .age-difference {
            font-size: 1.5rem;
            font-weight: 700;
            padding: 1rem 2rem;
            border-radius: 8px;
            background-color: white;
            box-shadow: 0 4px 6px rgba(0,0,0,0.05);
        }
        
        .difference-positive {
            color: var(--fitness-green);
        }
        
        .difference-negative {
            color: var(--fitness-orange);
        }
        
        .difference-neutral {
            color: var(--fitness-blue);
        }
        
        /* Factor scoring */
        .factor-score {
            display: inline-block;
            padding: 0.25rem 0.5rem;
            border-radius: 4px;
            font-weight: 600;
            font-size: 0.8rem;
            margin-left: 0.5rem;
        }
        
        .score-excellent {
            background-color: rgba(25, 135, 84, 0.1);
            color: var(--fitness-green);
        }
        
        .score-good {
            background-color: rgba(13, 110, 253, 0.1);
            color: var(--fitness-blue);
        }
        
        .score-fair {
            background-color: rgba(255, 193, 7, 0.1);
            color: var(--warning-color);
        }
        
        .score-poor {
            background-color: rgba(253, 126, 20, 0.1);
            color: var(--fitness-orange);
        }
        
        .score-very-poor {
            background-color: rgba(220, 53, 69, 0.1);
            color: var(--danger-color);
        }
        
        /* Recommendations */
        .recommendation-card {
            background-color: white;
            border-radius: 8px;
            padding: 1.5rem;
            margin-bottom: 1rem;
            border: 1px solid var(--border-color);
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
        }
        
        .recommendation-card h5 {
            color: var(--primary-color);
            margin-bottom: 0.75rem;
            display: flex;
            align-items: center;
        }
        
        .recommendation-icon {
            width: 30px;
            height: 30px;
            border-radius: 50%;
            background-color: rgba(44, 125, 160, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 0.75rem;
            color: var(--primary-color);
        }
        
        /* Validation message */
        .validation-message {
            padding: 0.5rem;
            border-radius: 4px;
            margin-bottom: 1rem;
            font-size: 0.9rem;
        }
        
        .validation-success {
            background-color: rgba(25, 135, 84, 0.1);
            color: var(--fitness-green);
            border-left: 3px solid var(--fitness-green);
        }
        
        .validation-error {
            background-color: rgba(220, 53, 69, 0.1);
            color: var(--danger-color);
            border-left: 3px solid var(--danger-color);
        }
        
        /* Input validation state */
        .validation-icon {
            position: absolute;
            right: 10px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 1rem;
        }
        
        .validation-valid {
            color: var(--fitness-green);
        }
        
        .validation-invalid {
            color: var(--danger-color);
        }
        
        .input-with-validation {
            position: relative;
        }
        
        /* Percentile display */
        .percentile-display {
            display: inline-block;
            padding: 0.5rem 1rem;
            background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
            border-radius: 8px;
            font-weight: 600;
            margin: 0.5rem 0;
        }
        
        .percentile-high {
            color: var(--fitness-green);
            background: linear-gradient(135deg, rgba(25, 135, 84, 0.1) 0%, rgba(25, 135, 84, 0.05) 100%);
        }
        
        .percentile-medium {
            color: var(--fitness-blue);
            background: linear-gradient(135deg, rgba(13, 110, 253, 0.1) 0%, rgba(13, 110, 253, 0.05) 100%);
        }
        
        .percentile-low {
            color: var(--fitness-orange);
            background: linear-gradient(135deg, rgba(253, 126, 20, 0.1) 0%, rgba(253, 126, 20, 0.05) 100%);
        }
         
        
        /* Action buttons */
        .action-btns {
            display: flex;
            gap: 0.5rem;
        }