* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    background: white;
    min-height: 100vh;
    box-shadow: 0 0 20px rgba(0,0,0,0.1);
}

.header {
    background: linear-gradient(135deg, #2c3e50, #3498db);
    color: white;
    padding: 2rem;
    text-align: center;
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

.content {
    padding: 2rem;
}

.page {
    display: none;
}

.page.active {
    display: block;
}

.progress-bar {
    width: 100%;
    height: 20px;
    background-color: #e0e0e0;
    border-radius: 10px;
    margin-bottom: 2rem;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #3498db, #2ecc71);
    transition: width 0.3s ease;
}

.section-info {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    border-left: 4px solid #3498db;
}

.question-card {
    background: white;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.question-number {
    color: #3498db;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.question-text {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #2c3e50;
}

.options {
    list-style: none;
}

.option {
    margin-bottom: 0.8rem;
    padding: 0.8rem;
    border: 2px solid #e0e0e0;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.option:hover {
    border-color: #3498db;
    background-color: #f8f9fa;
}

.option.selected {
    border-color: #3498db;
    background-color: #e3f2fd;
}

.option input[type="radio"] {
    margin-right: 0.8rem;
}

.navigation {
    display: flex;
    justify-content: space-between;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid #eee;
}

.btn {
    background: #3498db;
    color: white;
    border: none;
    padding: 0.8rem 2rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    transition: background 0.3s ease;
}

.btn:hover {
    background: #2980b9;
}

.btn:disabled {
    background: #bdc3c7;
    cursor: not-allowed;
}

.btn-secondary {
    background: #95a5a6;
}

.btn-secondary:hover {
    background: #7f8c8d;
}

.btn-success {
    background: #27ae60;
}

.btn-success:hover {
    background: #229954;
}

.results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.score-card {
    background: white;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.score-value {
    font-size: 2.5rem;
    font-weight: bold;
    color: #3498db;
    margin-bottom: 0.5rem;
}

.score-label {
    color: #7f8c8d;
    font-weight: 600;
}

.chart-container {
    background: white;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 2rem;
    text-align: center;
}

.recommendations {
    background: #f8f9fa;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 2rem;
}

.recommendations h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

.recommendations ul {
    list-style-type: disc;
    margin-left: 2rem;
}

.recommendations li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.review-item {
    background: white;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.answer-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin: 1rem 0;
}

.user-answer, .correct-answer {
    padding: 1rem;
    border-radius: 6px;
}

.user-answer {
    background: #ffebee;
    border: 1px solid #ef5350;
}

.correct-answer {
    background: #e8f5e8;
    border: 1px solid #4caf50;
}

.user-answer.correct {
    background: #e8f5e8;
    border: 1px solid #4caf50;
}

.explanation {
    background: #f0f8ff;
    border: 1px solid #2196f3;
    border-radius: 6px;
    padding: 1rem;
    margin-top: 1rem;
}

.section-navigation {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.section-btn {
    background: #ecf0f1;
    color: #2c3e50;
    border: 2px solid #bdc3c7;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.section-btn.active {
    background: #3498db;
    color: white;
    border-color: #2980b9;
}

.section-btn.completed {
    background: #27ae60;
    color: white;
    border-color: #229954;
}

@media (max-width: 768px) {
    .results-grid {
        grid-template-columns: 1fr;
    }
    
    .answer-comparison {
        grid-template-columns: 1fr;
    }
    
    .navigation {
        flex-direction: column;
        gap: 1rem;
    }
    
    .section-navigation {
        flex-direction: column;
    }
}