body {
            box-sizing: border-box;
            font-family: 'Comic Sans MS', cursive, sans-serif;
            margin: 0;
            padding: 20px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .header {
            text-align: center;
            margin-bottom: 40px;
            color: white;
        }

        .title {
            font-size: 3em;
            margin-bottom: 10px;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }

        .subtitle {
            font-size: 1.3em;
            opacity: 0.9;
            margin-bottom: 20px;
        }

        .welcome-card {
            background: white;
            border-radius: 20px;
            padding: 30px;
            margin-bottom: 40px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
            text-align: center;
        }

        .welcome-text {
            font-size: 1.4em;
            color: #4a5568;
            margin-bottom: 20px;
        }

        .games-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 25px;
            margin-bottom: 40px;
        }

        .game-card {
            background: white;
            border-radius: 20px;
            padding: 30px;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 5px 20px rgba(0,0,0,0.1);
            border: 3px solid transparent;
        }

        .game-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(0,0,0,0.2);
            border-color: #4299e1;
        }

        .game-icon {
            font-size: 4em;
            margin-bottom: 15px;
            display: block;
        }

        .game-title {
            font-size: 1.5em;
            font-weight: bold;
            color: #2d3748;
            margin-bottom: 10px;
        }

        .game-description {
            color: #718096;
            font-size: 1em;
            line-height: 1.5;
            margin-bottom: 15px;
        }

        .difficulty {
            display: inline-block;
            background: #e2e8f0;
            color: #4a5568;
            padding: 5px 15px;
            border-radius: 20px;
            font-size: 0.9em;
            font-weight: bold;
        }

        .difficulty.easy {
            background: #c6f6d5;
            color: #22543d;
        }

        .difficulty.medium {
            background: #fef5e7;
            color: #744210;
        }

        .difficulty.hard {
            background: #fdecea; 
            color: #7a1f1f;     
        }

        .back-btn {
            background: #4299e1;
            color: white;
            border: none;
            padding: 12px 25px;
            border-radius: 25px;
            font-size: 1.1em;
            font-weight: bold;
            cursor: pointer;
            margin-bottom: 20px;
            transition: all 0.3s ease;
            font-family: inherit;
        }

        .back-btn:hover {
            background: #3182ce;
            transform: scale(1.05);
        }

        /* Quiz Styles */
        .quiz-container {
            background: white;
            border-radius: 20px;
            padding: 30px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
            max-width: 600px;
            margin: 0 auto;
            text-align: center;
        }

        .score-board {
            display: flex;
            justify-content: space-between;
            background: #f7fafc;
            padding: 15px;
            border-radius: 15px;
            margin-bottom: 25px;
            font-size: 1.2em;
            font-weight: bold;
        }

        .question-card {
            background: #edf2f7;
            padding: 25px;
            border-radius: 15px;
            margin-bottom: 25px;
            border-left: 5px solid #4299e1;
        }

        .question {
            font-size: 1.4em;
            color: #2d3748;
            margin-bottom: 20px;
            font-weight: bold;
        }

        .options {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 15px;
            margin-bottom: 20px;
        }

        .option {
            background: #4299e1;
            color: white;
            border: none;
            padding: 15px;
            border-radius: 12px;
            font-size: 1.1em;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s ease;
            font-family: inherit;
        }

        .option:hover {
            background: #3182ce;
            transform: translateY(-2px);
        }

        .option.correct {
            background: #38a169;
            animation: bounce 0.6s ease;
        }

        .option.wrong {
            background: #e53e3e;
            animation: shake 0.6s ease;
        }

        .feedback {
            font-size: 1.3em;
            font-weight: bold;
            margin: 15px 0;
            padding: 15px;
            border-radius: 10px;
        }

        .feedback.correct {
            background: #c6f6d5;
            color: #22543d;
        }

        .feedback.wrong {
            background: #fed7d7;
            color: #742a2a;
        }

        .next-btn, .restart-btn {
            background: #ed8936;
            color: white;
            border: none;
            padding: 15px 30px;
            border-radius: 25px;
            font-size: 1.2em;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s ease;
            font-family: inherit;
            margin: 10px;
        }

        .restart-btn {
            background: #38a169;
        }

        .final-score {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 30px;
            border-radius: 20px;
            margin-top: 20px;
        }

        /* Memory Game Styles */
        .memory-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 15px;
            max-width: 400px;
            margin: 20px auto;
        }

        .memory-card {
            aspect-ratio: 1;
            background: #4299e1;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2em;
            cursor: pointer;
            transition: all 0.3s ease;
            color: transparent;
        }

        .memory-card:hover {
            transform: scale(1.05);
        }

        .memory-card.flipped {
            background: #e2e8f0;
            color: #2d3748;
        }

        .memory-card.matched {
            background: #38a169;
            color: white;
        }

        /* Math Game Styles */
        .math-problem {
            font-size: 2.5em;
            color: #2d3748;
            margin: 30px 0;
            font-weight: bold;
        }

        .math-input {
            font-size: 2em;
            padding: 15px;
            border: 3px solid #4299e1;
            border-radius: 10px;
            text-align: center;
            width: 150px;
            margin: 20px;
            font-family: inherit;
        }

        .submit-btn {
            background: #38a169;
            color: white;
            border: none;
            padding: 15px 30px;
            border-radius: 25px;
            font-size: 1.3em;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s ease;
            font-family: inherit;
        }

        @keyframes bounce {
            0%, 20%, 60%, 100% { transform: translateY(0); }
            40% { transform: translateY(-10px); }
            80% { transform: translateY(-5px); }
        }

        @keyframes shake {
            0%, 100% { transform: translateX(0); }
            10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
            20%, 40%, 60%, 80% { transform: translateX(5px); }
        }

        @media (max-width: 768px) {
            .games-grid {
                grid-template-columns: 1fr;
            }
            
            .title {
                font-size: 2.2em;
            }
            
            .options {
                grid-template-columns: 1fr;
            }
            
            .memory-grid {
                grid-template-columns: repeat(3, 1fr);
                max-width: 300px;
            }
        }