@media screen and (max-width: 768px) {
  .top__mainvisual--concept {
    background-image: url(../img/shang/line_oa_chat_200513_152731.jpg);
  }
}

@media screen and (min-width: 769px) {
  .top__mainvisual--concept {
    background-image: url(../img/shang/line_oa_chat_200513_152731.jpg);
  }
}

@media screen and (max-width: 768px) {
  .top__mainvisual--product {
    background-image: url(../img/shang/line_oa_chat_200513_152733.jpg);
    background-size: 100%;
  }
}

@media screen and (min-width: 769px) {
  .top__mainvisual--product {
    background-image: url(../img/shang/line_oa_chat_200513_152733.jpg);
    background-size: 100%;
  }
}

@media screen and (max-width: 768px) {
  .top__mainvisual--regular {
    background-image: url(../img/shang/line_oa_chat_200513_152738.jpg);
    background-size: 100%;
  }
}

@media screen and (min-width: 769px) {
  .top__mainvisual--regular {
    background-image: url(../img/shang/line_oa_chat_200513_152738.jpg);
    background-size: 100%;
  }
}

@media screen and (max-width: 768px) {
  .technology {
    margin-top: 56px;
  }

  .technology__visual {
    padding-bottom: 43.36%;
    background-image: url(../img/shang/line_oa_chat_200513_152744.jpg);
  }
}

@media screen and (min-width: 769px) {
  .technology {
    position: relative;
    margin-top: 106px;
  }

  .technology__visual {
    margin-top: 102px;
    padding-bottom: 26%;
    background-image: url(../img/shang/line_oa_chat_200513_152744.jpg);
    background-position: center;
    background-size: cover;
    background-attachment: fixed;
  }
}

.concept__body {
  padding: 63px 1rem;
  min-height: 463px;
}
@media screen and (min-width: 769px) {
  .concept__body {
    padding: 63px 17% 0 13%;
    min-height: 463px;
  }
}