body {
    font-family: Arial, sans-serif;
    background: #f4f4f4;
}

main {
    padding: 2rem;
}

.product-container {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.image-section {
    background: #fff;
    padding: 1rem;
    max-width: 320px;
    border: 1px solid #aaa;
}

.image-section img#mainImage {
    width: 100%;
    margin-bottom: 1rem;
}

.thumbnails {
    display: flex;
    gap: 1rem;
}

.thumbnails img.thumbnail {
    width: 30%;
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: border 0.3s;
}

.thumbnails img.thumbnail.selected {
    border-bottom: 3px solid red;
}

form {
    border: 1px solid #aaa;
    min-width: 250px;
    background: #fff;
    padding: 1rem;
}

form div {
    border: 1px solid #ccc;
    border-radius: 8px;
    margin-bottom: 1rem;
    padding: 1rem;
}

form label {
    display: block;
}

#submitBtn {
    color: white;
    border: none;
    border-radius: 6px;
    box-shadow: 2px 2px 4px #ccc;
    width: 100%;
    padding: 0.6rem;
    cursor: not-allowed;
    font-weight: bold;
    background: #003366;
}

#submitBtn:enabled {
    cursor: pointer;
    background: #0066cc;
}

footer {
    color: white;
    background: grey;
    text-align: center;
    padding: 0.5rem;
    margin-top: 2rem;

}