body {
    color: white;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    margin: 0;
    line-height: 1.8em;
}

.background {
    background: url("../images/background.webp") no-repeat;
    background-size: cover;
    top: 0;
    left: 0;
    z-index: -1;
    width: 100%;
    height: 100%;
    display: block;
    position: fixed;
}

main {
    margin: 0 auto;
    max-width: 1280px;
}

.button {
    transition: transform 0.1s ease;
    position: relative;
    display: inline-block;
    cursor: pointer;
}

.button:hover {
    transform: scale(1.1);
}

.button:active {
    transform: scale(1.05);
}

.button img {
    display: block;
}

.button-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 24px;
    font-weight: bold;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.7);
}

section {
    padding: 20px;
}

.multiline-layout {
    display: flex;
    min-height: 300px;
}

.header-left {
    flex: 1;
}

.header-right {
    flex: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
}

.title {
    font-size: 20px;
    margin-bottom: 20px;
}

.icon {
    border-radius: 50%;
    border: 5px solid white;
    box-shadow: 0 10px 25px 0 rgba(0, 0, 0, 0.25);
    display: block;
    margin: auto;
    width: 50%;
    margin-top: 40px;
}

.section-left {
    flex: 1;
    margin-right: 20px;
}

.section-right {
    flex: 1;
}

.demoimage {
    max-width: 100%;
    height: auto;
    padding-top: 20px;
}

footer p {
    text-align: center;
}

a {
    color: #B0C4DE; /* 薄い青色 */
    text-decoration: none; /* 下線を消す */
}

a:hover {
    color: #ADD8E6; /* ホバー時の色を変更 */
}

@media (max-width: 768px) {
    main {
        flex-direction: column;
        margin: 10px;
    }

    section {
        display: block;
    }

    .multiline-layout {
        display: block;
    }

    .icon {
        width: 40%;
    }

    .section-left {
        margin: 0;
        margin-top: 20px;
    }

    .demoimage {
        padding-top: 0;
    }
}