: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;
            --game-color-1: #e63946;
            --game-color-2: #a8dadc;
            --game-color-3: #457b9d;
            --game-color-4: #1d3557;
            --game-color-5: #f4a261;
        } 
        .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);
        }
         
        /* Game Styles */
        .game-container {
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 2rem 0;
        }
        
        .game-board {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            grid-gap: 20px;
            margin: 2rem 0;
            max-width: 500px;
            width: 100%;
        }
        
        .game-tile {
            aspect-ratio: 1;
            border-radius: 12px;
            cursor: pointer;
            transition: all 0.2s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2rem;
            font-weight: bold;
            color: white;
            box-shadow: 0 4px 6px rgba(0,0,0,0.1);
            user-select: none;
        }
        
        .game-tile:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(0,0,0,0.15);
        }
        
        .game-tile.active {
            transform: scale(0.95);
            box-shadow: 0 2px 4px rgba(0,0,0,0.2);
        }
        
        .tile-1 { background-color: var(--game-color-1); }
        .tile-2 { background-color: var(--game-color-2); color: #333; }
        .tile-3 { background-color: var(--game-color-3); }
        .tile-4 { background-color: var(--game-color-4); }
        .tile-5 { background-color: var(--game-color-5); color: #333; }
        .tile-6 { background-color: var(--primary-color); }
        
        .game-controls {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin: 2rem 0;
            justify-content: center;
        }
        
        .game-stats {
            display: flex;
            justify-content: space-around;
            width: 100%; 
            margin: 1.5rem 0;
            flex-wrap: wrap;
        }
        
        .stat-item {
            text-align: center;
            padding: 1rem;
            min-width: 150px;
        }
        
        .stat-value {
            font-size: 2rem;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 0.5rem;
        }
        
        .stat-label {
            color: var(--text-muted);
            font-size: 0.9rem;
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        
        .game-progress {
            width: 100%; 
            margin: 1.5rem 0;
        }
        
        .progress-bar {
            height: 10px;
            border-radius: 5px;
            overflow: hidden;
            background-color: #e9ecef;
        }
        
        .progress-fill {
            height: 100%;
            background-color: var(--primary-color);
            width: 0%;
            transition: width 0.5s ease;
        }
        
        .game-message {
            text-align: center;
            padding: 1rem;
            margin: 1rem 0;
            border-radius: 8px;
            font-weight: 600;
            min-height: 60px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .message-waiting {
            background-color: rgba(255, 193, 7, 0.1);
            color: #856404;
        }
        
        .message-playing {
            background-color: rgba(0, 123, 255, 0.1);
            color: #004085;
        }
        
        .message-success {
            background-color: rgba(40, 167, 69, 0.1);
            color: #155724;
        }
        
        .message-error {
            background-color: rgba(220, 53, 69, 0.1);
            color: #721c24;
        }
        
        .difficulty-selector {
            display: flex;
            background-color: var(--light-gray);
            border-radius: 6px;
            padding: 4px;
            margin-bottom: 1.5rem;
            flex-wrap: wrap;
        }
        
        .difficulty-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;
        }
        
        .difficulty-btn.active {
            background-color: var(--primary-color);
            color: white;
        }
         
        /* Responsive Adjustments */
        @media (max-width: 768px) { 
            .game-board {
                grid-gap: 15px;
            }
            
            .game-stats {
                flex-direction: column;
                align-items: center;
            }
            
            .stat-item {
                min-width: 100%;
                padding: 0.5rem 0;
            }
        }
        
        /* Animations */
        @keyframes pulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.1); }
            100% { transform: scale(1); }
        }
        
        .pulse {
            animation: pulse 0.5s ease-in-out;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }
        
        .fade-in {
            animation: fadeIn 0.3s ease-in;
        }
        
        /* Leaderboard */
        .leaderboard {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
        }
        
        .leaderboard th, .leaderboard td {
            padding: 0.75rem;
            text-align: left;
            border-bottom: 1px solid var(--border-color);
        }
        
        .leaderboard th {
            background-color: var(--light-gray);
            font-weight: 600;
        }
        
        .leaderboard tr:nth-child(even) {
            background-color: rgba(44, 125, 160, 0.05);
        }
        
        .leaderboard tr:hover {
            background-color: rgba(44, 125, 160, 0.1);
        }
        
        .medal {
            display: inline-block;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            margin-right: 8px;
            text-align: center;
            line-height: 20px;
            font-size: 12px;
            font-weight: bold;
        }
        
        .gold { background-color: gold; color: #333; }
        .silver { background-color: silver; color: #333; }
        .bronze { background-color: #cd7f32; color: white; }
        
        /* Memory Tips */
        .memory-tip {
            background-color: rgba(40, 167, 69, 0.05);
            border-left: 3px solid var(--success-color);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1rem 0;
        }
        
        .cognitive-skill {
            display: inline-block;
            background-color: rgba(44, 125, 160, 0.1);
            color: var(--primary-color);
            padding: 0.25rem 0.5rem;
            border-radius: 4px;
            margin: 0.25rem;
            font-size: 0.9rem;
        }