body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    background-color: #f9f9f9;
    color: #333;
}

header {
    background-color: #007bff;
    color: white;
    padding: 1rem;
    text-align: center;
}

main {
    padding: 1rem;
}

h2 {
    margin-top: 2rem;
}

.description ul {
    padding-left: 1.5rem;
}

.device-section {
    margin-top: 2rem;
}

.image-row {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

.image-row img {
    max-width: 100%;
    height: auto;
    width: 30%;
    border: 1px solid #ccc;
    border-radius: 8px;
}

/* スマートフォン表示時のスタイル */
@media screen and (max-width: 768px) {
    .image-row {
        flex-direction: column;
        align-items: center;
    }

    .image-row img {
        width: 90%;
    }
}