@media only screen and (max-width:640px){
    .advantages_detail {
        margin-top: 80px;
    }
    .advantages_detail main {
        width: calc(100% - 32px);
        padding: 20px 16px 0 16px;
        flex-wrap: wrap;
        flex-direction: column-reverse;
    }
    .detail_content {
        max-width: none;
        width: 100%;
        margin-left: 0px;
        margin-bottom: 65px;
    }
    .detail_content .content_inner {
        margin-bottom: 60px;
    }
    .detail_content .product_title {
        margin-bottom: 40px;
        padding-bottom: 13px;
    }
    .product_title h1 {
        font-size: 24px;
    }
    .product_title h1 span {
        font-size: 12px;
    }
    .product_title h1.longtxt {
        line-height: 1.4;
    }
    .product_mainvisual {
        height: auto;
        max-height: none;
        margin-bottom: 70px;
    }
    .product_mainvisual p {
        position: relative;
        top: 0px;
        left: auto;
        margin-left: 8px;
        font-size: 20px;
        line-height: 1.5;
    }
    .product_mainvisual p .narrowleft {
        margin-left: -8px;
    }
    .product_mainvisual p.smaller {
        margin-top: 10px;
        font-size: 16px;
    }
    .product_mainvisual img {
        max-width: 100%;
        width: auto;
        height: auto;
        margin-top: 35px;
        position: relative;
        margin-left: 50%;
        transform: translateX(-50%);
    }
    .product_mainvisual.colorpencil03 img {
        right: 0px;
    }
    .advantages_list {
        width: calc(100% - 16px);
        padding: 0 8px;
    }
    .advantages_list li {
        margin-bottom: 38px;
        flex-wrap: wrap;
    }
    .advantages_list .advantages_item img {
        width: 225px;
        height: 225px;
        margin-right: 0px;
        margin-left: calc(50% - 112.5px);
    }
    .advantages_list .advantages_txt {
        margin-top: 3px;
    }
    .advantages_list .advantages_txt h2 {
        font-size: 32px;
        margin-bottom: 16px;
        margin-left: 48px;
    }
    .advantages_list .advantages_txt h2 span {
        font-size: 14px;
        left: -48px;
        top: 13px;
    }
    .advantages_list .advantages_txt h3 {
        margin-bottom: 12px;
    }
    .advantages_list.pencil04 .advantages_txt h3 {
        line-height: 1.4;
        margin-bottom: 10px;
    }
    .advantages_list .advantages_txt p {
        font-size: 4.2vw;
    }
    .advantages_list .advantages_txt p.small_txt {
        font-size: 12px;
    }
    .advantages_list .advantages_item img.special_img {
        width: 250px;
        height: 233px;
        margin-left: 46px;
        margin-top: -4px;
    }
    .detail_content .lineup_banner {
        margin-bottom: 40px;
    }
    .detail_content .lineup_banner a {
        width: calc(100% - 24px);
        height: auto;
    }
    .detail_content .lineup_banner a img {
        height: auto;
    }
    .back_btn a {
        width: 161px;
        height: 36px;
        border-radius: 18px;
        font-size: 12px;
    }
    .back_btn a::before {
        width: 4px;
        height: 7px;
        left: 14px;
        top: 14px;
    }
    .detail_video {
        margin-top: 0px;
    }
    .detail_video .movie_ttl {
        font-size: 6vw;
        line-height: 1.4;
        margin-bottom: 24px;
    }
    .pv_content {
        width: 100vw;
        max-width: none;
        height: 56.25vw;
        max-height: none;
        margin-left: -16px;
    }
}

























/* ... */