.quiz-container {
            background: white;
            border-radius: 20px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
            width: 100%;
            max-width: 600px;
            overflow: hidden;
            position: relative;
        }

        .progress-bar {
            height: 6px;
            background: #e0e6ed;
            position: relative;
        }

        .progress-fill {
            height: 100%;
            background: linear-gradient(90deg, #4facfe 0%, #00f2fe 100%);
            transition: width 0.5s ease;
            width: 0%;
        }

        .quiz-header {
            padding: 30px 40px 20px;
            text-align: center;
            border-bottom: 1px solid #e0e6ed;
        }

        .question-counter {
            font-size: 16px;
            color: #666;
            margin-bottom: 10px;
        }

        .quiz-title {
            font-size: 28px;
            color: #2d3748;
            font-weight: 600;
        }

        .questions-container {
            position: relative;
            height: 400px;
            overflow: hidden;
        }

        .question-slide {
            position: absolute;
            width: 100%;
            height: 100%;
            padding: 40px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            transform: translateX(100%);
            transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
            opacity: 0;
        }

        .question-slide.active {
            transform: translateX(0);
            opacity: 1;
        }

        .question-slide.prev {
            transform: translateX(-100%);
            opacity: 0;
        }

        .question {
            font-size: 22px;
            color: #2d3748;
            margin-bottom: 30px;
            line-height: 1.4;
            font-weight: 500;
        }

        .answers {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .answer-btn {
            background: #f7fafc;
            border: 2px solid #e2e8f0;
            border-radius: 12px;
            padding: 18px 24px;
            font-size: 16px;
            color: #4a5568;
            cursor: pointer;
            transition: all 0.3s ease;
            text-align: left;
            position: relative;
            overflow: hidden;
        }

        .answer-btn:hover {
            background: #edf2f7;
            border-color: #cbd5e0;
            transform: translateY(-2px);
        }

        .answer-btn.selected {
            background: #ebf8ff;
            border-color: #3182ce;
            color: #2b6cb0;
        }

        .answer-btn.correct {
            background: #f0fff4;
            border-color: #38a169;
            color: #2f855a;
        }

        .answer-btn.incorrect {
            background: #fed7d7;
            border-color: #e53e3e;
            color: #c53030;
        }

        .quiz-controls {
            padding: 30px 40px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: #f8f9fa;
        }

        .control-btn {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            border-radius: 10px;
            padding: 12px 30px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
        }

        .control-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
        }

        .control-btn:disabled {
            background: #a0aec0;
            cursor: not-allowed;
            transform: none;
            box-shadow: none;
        }

        .score-display {
            text-align: center;
            padding: 60px 40px;
            display: none;
        }

        .score-display.show {
            display: block;
        }

        .score-title {
            font-size: 32px;
            color: #2d3748;
            margin-bottom: 20px;
            font-weight: 700;
        }

        .score-result {
            font-size: 48px;
            font-weight: 800;
            margin-bottom: 20px;
        }

        .score-excellent {
            color: #38a169;
        }

        .score-good {
            color: #3182ce;
        }

        .score-average {
            color: #d69e2e;
        }

        .score-poor {
            color: #e53e3e;
        }

        .score-message {
            font-size: 18px;
            color: #666;
            margin-bottom: 30px;
        }

        .restart-btn {
            background: linear-gradient(135deg, #48bb78 0%, #38a169 100%);
            color: white;
            border: none;
            border-radius: 12px;
            padding: 15px 40px;
            font-size: 18px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(72, 187, 120, 0.3);
        }

        .restart-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(72, 187, 120, 0.4);
        }

        @media (max-width: 600px) {
            .quiz-container {
                margin: 10px;
                border-radius: 15px;
            }
            
            .quiz-header, .quiz-controls {
                padding: 20px;
            }
            
            .question-slide {
                padding: 20px;
            }
            
            .question {
                font-size: 20px;
            }
            
            .quiz-title {
                font-size: 24px;
            }
        }