body {
    background-color: #f8f9fa;
    min-height: 100vh;
}

.card {
    border: none;
    border-radius: 10px;
}

.card-header {
    background-color: #fff;
    border-bottom: 2px solid #e9ecef;
    font-weight: 600;
}

.btn {
    border-radius: 5px;
    font-weight: 500;
}

.navbar-brand {
    font-size: 1.5rem;
}

.topic-card {
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.topic-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.answer-option {
    cursor: pointer;
    padding: 15px;
    border: 2px solid #dee2e6;
    border-radius: 8px;
    margin-bottom: 10px;
    transition: all 0.2s;
}

.answer-option:hover {
    border-color: #0d6efd;
    background-color: #f8f9fa;
}

.answer-option.selected {
    border-color: #0d6efd;
    background-color: #e7f3ff;
}

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

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

.answer-option input[type="radio"] {
    cursor: pointer;
    margin-right: 10px;
}