.quiz-container {
        font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        max-width: 800px;
        margin: 20px auto;
        padding: 20px;
        background-color: #f9f9f9;
        border-radius: 8px;
        border: 1px solid #ddd;
    }
    .quiz-header {
        text-align: center;
        color: #003366;
        border-bottom: 2px solid #003366;
        padding-bottom: 10px;
    }
    .question-block {
        background: white;
        margin-bottom: 15px;
        padding: 15px;
        border-left: 5px solid #003366;
        box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    }
    .question-text {
        font-weight: bold;
        display: block;
        margin-bottom: 10px;
    }
    .options {
        list-style-type: none;
        padding-left: 0;
    }
    .options li {
        margin-bottom: 5px;
    }
    details {
        margin-top: 10px;
        padding: 10px;
        background: #e7f3fe;
        border-radius: 4px;
        cursor: pointer;
    }
    summary {
        font-weight: bold;
        color: #0056b3;
    }
    .explanation {
        margin-top: 5px;
        font-size: 0.9em;
        color: #333;
    }