body {
    background-color: #f8f9fa;
}

.content-area {
    background: white;
    padding: 2rem;
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.content-area h3 {
    margin-top: 1.5rem;
    color: #333;
}

.content-area pre {
    background: #f1f3f5;
    padding: 1rem;
    border-radius: 0.25rem;
    overflow-x: auto;
}

.content-area code {
    color: #e83e8c;
}

.quiz-option {
    cursor: pointer;
    padding: 0.75rem 1rem;
    border: 2px solid #dee2e6;
    border-radius: 0.5rem;
    margin-bottom: 0.5rem;
    transition: border-color 0.2s;
}

.quiz-option:hover {
    border-color: #0d6efd;
}

.quiz-option.selected {
    border-color: #0d6efd;
    background-color: #e7f1ff;
}

.quiz-option.correct {
    border-color: #198754;
    background-color: #d1e7dd;
}

.quiz-option.incorrect {
    border-color: #dc3545;
    background-color: #f8d7da;
}

.progress {
    height: 1.5rem;
}