body { background-color: #f8f9fa; }
        .question-card, .related-card, .sidebar-card {
            background-color: #fff;
            border: 1px solid #dee2e6;
            border-radius: 0.25rem;
            margin-bottom: 1.5rem;
            box-shadow: 0 0.125rem 0.25rem rgba(0,0,0,.075);
        }
        .question-card .card-body, .related-card .card-body { padding: 2rem; }
        .question-text {
            font-size: 1.1rem;
            line-height: 1.6;
            margin-bottom: 1.5rem;
        }
        .options-list { list-style-type: none; padding-left: 0; }
        .options-list li {
            padding: 0.75rem 1.25rem;
            margin-bottom: 0.5rem;
            border: 1px solid #ddd;
            border-radius: 0.25rem;
        }
        .answer-reveal-section {
            display: none;
            margin-top: 1.5rem;
            padding: 1rem;
            border-radius: 0.25rem;
            background-color: #e9f7ef;
            border-left: 4px solid #28a745;
        }
        .related-questions-header {
            font-size: 1.5rem;
            font-weight: 600;
            margin-top: 2rem;
            margin-bottom: 1rem;
            border-bottom: 2px solid #007bff;
            padding-bottom: 0.5rem;
        }
        .sidebar-card .list-group-item a {
            color: #333;
            text-decoration: none;
            font-weight: 500;
        }
        .sidebar-card .list-group-item a:hover { color: #0056b3; }
    .view-the-answer {
        background-color: #007bff;
        color: #fff;
        border: none;
        padding: 0.5rem 1rem;
        border-radius: 0.25rem;
        cursor: pointer;
        font-size: 1rem;
        transition: background-color 0.3s ease;
    }
    .view-the-answer:hover { background-color: #0056b3; }