#mdcv4-app {
    max-width: 900px;
    margin: 40px auto;
    padding: 20px;
}

.card {
    background: #ffffff;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.08);
}

.card h1 {
    font-size: 42px;
    margin-bottom: 10px;
}

.card h2 {
    margin-bottom: 25px;
}

.question-option {
    width: 100%;
    display: block;
    padding: 14px;
    margin-bottom: 10px;
    border: 1px solid #d9d9d9;
    background: white;
    border-radius: 8px;
    cursor: pointer;
    transition: all .2s ease;
}

.question-option:hover {
    background: #0057b8;
    color: white;
}

.card input {
    width: 100%;
    padding: 12px;
    margin-top: 12px;
    margin-bottom: 12px;
    border: 1px solid #d9d9d9;
    border-radius: 8px;
}

.card button {
    width: 100%;
    background: #0057b8;
    color: white;
    border: 0;
    border-radius: 8px;
    padding: 14px;
    cursor: pointer;
}

.card button:hover {
    background: #003f85;
}

canvas {
    max-height: 400px;
}

@media (max-width: 768px) {

    .card {
        padding: 20px;
    }

    .card h1 {
        font-size: 30px;
    }
}