.quiz-container {
            background: white;
            border-radius: 12px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            padding: 2rem;
            margin: 2rem auto;
            max-width: 800px;
        }
        
        .quiz-header {
            background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
            color: white;
            padding: 1.5rem;
            border-radius: 8px 8px 0 0;
            margin: -2rem -2rem 2rem -2rem;
        }
        
        .progress {
            height: 8px;
            margin: 1.5rem 0;
        }
        
        .progress-bar {
            background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
        }
        
        .option-btn {
            text-align: left;
            padding: 1rem 1.5rem;
            margin: 0.5rem 0;
            border: 2px solid #e2e8f0;
            border-radius: 8px;
            transition: all 0.3s ease;
            background: white;
        }
        
        .option-btn:hover {
            border-color: #4f46e5;
            background: #f8fafc;
        }
        
        .option-btn.correct {
            background: #dcfce7;
            border-color: #22c55e;
            color: #166534;
        }
        
        .option-btn.incorrect {
            background: #fee2e2;
            border-color: #ef4444;
            color: #b91c1c;
        }
        
        .option-btn:disabled {
            cursor: not-allowed;
        }
        
        .score-display {
            font-size: 1.5rem;
            font-weight: bold;
            color: #4f46e5;
        }
        
        .quiz-result {
            text-align: center;
            padding: 2rem;
        }
        
        .result-icon {
            font-size: 4rem;
            margin-bottom: 1rem;
        }
        
        .restart-btn, #next-btn {
            background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
            border: none;
            padding: 0.75rem 2rem;
            font-size: 1.1rem;
            margin-top: 1rem;
        }
        
        .quiz-timer {
            background: #f1f5f9;
            padding: 0.5rem 1rem;
            border-radius: 20px;
            font-weight: bold;
            color: #4f46e5;
        }
        
        .exit-btn {
            background: #6b7280;
            border: none;
            padding: 0.75rem 2rem;
            font-size: 1.1rem;
        }
        
        .exit-btn:hover {
            background: #4b5563;
        }
        
        .button-group {
            display: flex;
            justify-content: center;
            gap: 1rem;
            margin-top: 1.5rem;
        }
        
        /* Explanation styling */
        .explanation-container {
            background-color: #f8f9fa;
            border-left: 4px solid #4f46e5;
            padding: 1rem 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
            display: none;
        }
        
        .explanation-title {
            font-weight: bold;
            color: #4f46e5;
            margin-bottom: 0.5rem;
        }
        
        /* Center the exit button in quiz game */
        #quiz-game .text-center .exit-btn {
            margin-top: 1rem;
            display: inline-block;
        }
        
        /* Fix for button alignment */
        .text-center .btn {
            margin: 0 5px;
        }