: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;
            --vision-blue: #4a6fa5;
            --vision-purple: #6f42c1;
        }
         
        .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);
        }
         
        .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;
        }
           
        
        /* Medical-specific styling */
        .medical-alert {
            background-color: rgba(220, 53, 69, 0.1);
            border-left: 4px solid var(--medical-red);
            padding: 1rem;
            margin: 1rem 0;
            border-radius: 0 4px 4px 0;
        }
        
        .normal-range {
            color: var(--medical-green);
            font-weight: 600;
        }
        
        .abnormal-range {
            color: var(--medical-red);
            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);
        }
        
        /* Visual acuity test specific styles */
        .dva-test-area {
            background-color: #f8f9fa;
            border: 2px dashed #dee2e6;
            border-radius: 10px;
            height: 300px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 1.5rem 0;
            position: relative;
            overflow: hidden;
        }
        
        .optotype-container {
            position: relative;
            text-align: center;
        }
        
        .optotype {
            font-size: 6rem;
            font-weight: bold;
            color: #000;
            font-family: 'Arial', sans-serif;
            transition: transform 0.5s ease;
        }
        
        .moving {
            animation: moveOptotype 2s infinite alternate;
        }
        
        @keyframes moveOptotype {
            0% { transform: translateX(-50px) translateY(-30px); }
            100% { transform: translateX(50px) translateY(30px); }
        }
        
        .velocity-control {
            margin: 1rem 0;
        }
        
        .velocity-slider {
            width: 100%;
            height: 10px;
            -webkit-appearance: none;
            background: #e9ecef;
            border-radius: 5px;
            outline: none;
        }
        
        .velocity-slider::-webkit-slider-thumb {
            -webkit-appearance: none;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: var(--primary-color);
            cursor: pointer;
        }
        
        .test-controls {
            display: flex;
            justify-content: center;
            gap: 1rem;
            margin: 1.5rem 0;
            flex-wrap: wrap;
        }
        
        .test-btn {
            padding: 0.75rem 1.5rem;
            border-radius: 6px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .test-btn-primary {
            background-color: var(--primary-color);
            color: white;
        }
        
        .test-btn-primary:hover {
            background-color: var(--accent-color);
        }
        
        .test-btn-secondary {
            background-color: #6c757d;
            color: white;
        }
        
        .test-btn-secondary:hover {
            background-color: #5a6268;
        }
        
        .test-results {
            margin-top: 2rem;
        }
        
        .vision-status {
            padding: 1rem;
            border-radius: 8px;
            margin: 1rem 0;
            border-left: 5px solid;
        }
        
        .vision-normal {
            background-color: rgba(40, 167, 69, 0.1);
            border-left-color: var(--medical-green);
        }
        
        .vision-mild {
            background-color: rgba(255, 193, 7, 0.1);
            border-left-color: var(--medical-yellow);
        }
        
        .vision-moderate {
            background-color: rgba(253, 126, 20, 0.1);
            border-left-color: var(--medical-orange);
        }
        
        .vision-severe {
            background-color: rgba(220, 53, 69, 0.1);
            border-left-color: var(--medical-red);
        }
        
        .vision-status-indicator {
            display: inline-block;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            margin-right: 8px;
        }
        
        .dva-chart-container {
            position: relative;
            height: 300px;
            width: 100%;
            margin: 1.5rem 0;
        }
        
        .test-instructions {
            background-color: rgba(111, 66, 193, 0.1);
            border-left: 4px solid var(--vision-purple);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1rem 0;
        }
        
        .test-log {
            background-color: #f8f9fa;
            border-radius: 6px;
            padding: 1rem;
            margin-top: 1rem;
            max-height: 200px;
            overflow-y: auto;
        }
        
        .log-entry {
            padding: 0.5rem;
            border-bottom: 1px solid #e9ecef;
        }
        
        .log-entry:last-child {
            border-bottom: none;
        }
        
        .log-correct {
            color: var(--medical-green);
        }
        
        .log-incorrect {
            color: var(--medical-red);
        }
        
        .optotype-grid {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 10px;
            margin: 1rem 0;
        }
        
        .optotype-choice {
            background-color: white;
            border: 2px solid #dee2e6;
            border-radius: 8px;
            padding: 1rem;
            text-align: center;
            font-size: 2rem;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .optotype-choice:hover {
            background-color: #f8f9fa;
            border-color: var(--primary-color);
        }
        
        .optotype-choice.selected {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }
        
        .test-progress {
            height: 10px;
            background-color: #e9ecef;
            border-radius: 5px;
            margin: 1rem 0;
            overflow: hidden;
        }
        
        .progress-bar {
            height: 100%;
            background-color: var(--primary-color);
            width: 0%;
            transition: width 0.5s ease;
        }
        
        .distance-indicator {
            position: absolute;
            top: 10px;
            right: 10px;
            background-color: rgba(0, 0, 0, 0.7);
            color: white;
            padding: 5px 10px;
            border-radius: 4px;
            font-size: 0.9rem;
        }
        
        .velocity-indicator {
            position: absolute;
            top: 10px;
            left: 10px;
            background-color: rgba(0, 0, 0, 0.7);
            color: white;
            padding: 5px 10px;
            border-radius: 4px;
            font-size: 0.9rem;
        }