body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

.navbar {
    background-color: #333;
    color: white;
    padding: 10px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar h1 {
    margin: 0;
    font-size: 24px;
}

.score, .question-count {
    font-size: 18px;
}

.quiz-container {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.question-slide {
    text-align: center;
}

h2 {
    color: #333;
}

#question-text {
    font-size: 20px;
    margin-bottom: 20px;
}

.option {
    display: block;
    margin: 10px auto;
    padding: 10px;
    width: 80%;
    background-color: #f9f9f9;
    border: 1px solid #ddd;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}

.option:hover {
    background-color: #e0e0e0;
}

.option.selected {
    background-color: #d3e4ff;
}

.option.correct {
    background-color: #d4edda;
    border-color: #28a745;
}

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

.explanation {
    margin-top: 20px;
    padding: 10px;
    background-color: #e9ecef;
    border-radius: 4px;
}

.explanation.hidden {
    display: none;
}

.button-group {
    margin-top: 20px;
}

button {
    padding: 10px 20px;
    margin: 0 10px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}

#submit-btn {
    background-color: #007bff;
    color: white;
}

#submit-btn:disabled {
    background-color: #6c757d;
    cursor: not-allowed;
}

#next-btn {
    background-color: #28a745;
    color: white;
}

#next-btn:disabled {
    background-color: #6c757d;
    cursor: not-allowed;
}