body {
    font-family: Arial, sans-serif;
    margin: 20px auto;
    max-width: 800px;
    padding: 10px;
    background-color: #f9f9f9;
    line-height: 1.6;
    color: #333;
}

h1 {
    text-align: center;
    font-size: 2em;
    padding-bottom: 20px;
    color: #2c3e50;
}

.part-section {
    margin-bottom: 40px;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    background-color: #fff;
}

.part-title {
    font-size: 1.5em;
    font-weight: bold;
    margin-bottom: 15px;
    color: #1abc9c;
    border-bottom: 2px solid #1abc9c;
    padding-bottom: 5px;
}

.question {
    margin-bottom: 20px;
}

.answers {
    margin-left: 20px;
}

.answers label {
    display: block;
    margin-bottom: 10px;
    cursor: pointer;
}

input[type="radio"] {
    margin-right: 10px;
}

.correct {
    color: #27ae60;
    font-weight: bold;
}

.wrong {
    color: #e74c3c;
    font-weight: bold;
}

.description {
    font-style: italic;
    margin-top: 10px;
    color: #555;
}

#submit-btn {
    display: block;
    margin: 20px auto;
    padding: 10px 20px;
    font-size: 1.2em;
    font-weight: bold;
    color: #fff;
    background-color: #3498db;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

#submit-btn:hover {
    background-color: #2980b9;
}

#results {
    margin-top: 30px;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    background-color: #fff;
}

.result {
    margin-top: 10px;
}

.pass {
    color: #27ae60;
    font-weight: bold;
    font-size: 1.8em;
}

.fail {
    color: #e74c3c;
    font-weight: bold;
    font-size: 1.8em;
}