@media (max-width: 768px) {

  /* Default CSS */
  body {
    font-size: 18px;
    width: 100vw;
  }

  section {
    padding: 20px;
  }

  .upper-bg {
    height: 814px;
    position: relative;
  }

  .container {
    height: 3570px;
    /* overflow: hidden; */
    position: relative;
    max-width: 100vw;
  }

  /* ########################### section: Header ################################## */
  header {
    width: 100vw;
  }

  .header-inner {
    padding: 0 20px;
  }

  .gnb {
    display: none;
  }

  .hide-burger {
    display: block;
  }

  /* ############################################ side-bar ############################################# */
  .side-bar-bg {
    position: fixed;
    background-color: rgba(0, 0, 0, 0.4);
    width: 100vw;
    height: 100vh;
    left: 0;
    top: 0;
    z-index: -1;
  }

  #side-bar {
    position: fixed;
    right: 0;
    width: 250px;
    height: 100vh;
    right: 0;
    z-index: 9999998;
  }

  #side-bar a:hover {
    background-color: var(--primary);
    color: #fff;
  }

  #side-bar>a:nth-child(1) {
    top: 0%;
  }

  #side-bar>a:nth-child(2) {
    top: 20%;
  }

  #side-bar>a:nth-child(3) {
    top: 40%;
  }

  #side-bar>a:nth-child(4) {
    top: 60%;
  }

  .hide-bar {
    display: none;
  }

  .side-bar-content {
    display: block;

  }

  .side-bar-main {
    display: block;
    text-align: center;
    height: 8%;
    padding: 10% 0;
    font-size: 24px;
    font-family: var(--textB);
    background-color: #eee;
    box-shadow: -4px 4px 10px #1f2023a4;
    transition: 0.3s;
  }

  .side-bar-sub {
    font-family: var(--textB);
    background-color: rgb(255, 255, 255);
    display: none;
  }

  .side-bar-sub a {
    display: block;
    padding: 12px;
    text-align: center;
  }

  .active-sidebar {
    background-color: var(--primary);
    color: #fff;
  }


  /* ########################### section: Welcome ################################## */
  .welcome-slider {
    display: none;
  }

  /* scroll-mouse */
  .scroll-mouse {
    padding-top: 810px;
  }

  /* ########################### btn: contact ################################## */
  .contact {
    display: none;
  }

  /* ########################### mobile-only ################################## */
  .mobile-text {
    position: absolute;
    display: block;
    padding-top: 305px;
    padding-left: calc(50% - 105px);
    font-family: var(--indextitle)
  }

  .mobile-text div {
    font-size: 35px;
    font-family: var(--indextitle);
    line-height: 45px;
    color: var(--highlight);
    text-align: center;
  }

  .mobile-text div:nth-child(2) span,
  .mobile-text div:nth-child(4) span {
    color: var(--primary);
    font-family: var(--indextitle);
  }

  #angular {
    top: calc(50% - 134px);
    left: calc(50% - 134px);
    display: block;
    position: absolute;
    animation: angular1 2.5s 1s linear infinite;
  }

  @keyframes angular1 {
    to {
      transform: rotate(360deg);
    }
  }

  /* ########################### news ################################## */
  .news {
    position: absolute;
    top: 824px;
    height: 860px;
  }

  .news-inner {
    height: 100%;
    width: 100%;
  }

  .contents {
    height: 131px;
    width: 321px;
    margin: auto;
  }

  .title1 {
    width: 321px;
    padding-top: 10px;
    position: relative;
  }

  .btn-more {
    width: 78px;
    margin-top: 20px;
    float: right;
  }

  .card {
    clear: both;
    width: 321px;
    height: 251px;
    margin-top: 20px;
  }

  .card:first-child {
    margin-top: 30px;
  }

  .card img {
    height: 131px;
    width: 321px;
  }

  .card table {
    width: 321px;
  }

  .card table tr {
    width: 321px;
  }

  .cards-text-dummi {
    width: 321px;
  }

  .news-title {
    width: 321px;
  }

  /* ########################### solutions ################################## */
  .solutions {
    top: 1760px;
    height: 620px;
  }

  .solutions-inner {
    width: 100%;
  }

  .title2 {
    top: 15px;
  }

  .contents2 {
    position: relative;
    height: 589px;
    width: 321px;
    margin: auto;
  }

  .sol-img {
    flex-direction: column;

  }

  .sol-img a img {
    width: 321px;
    margin: 0 20px 20px 0;
  }

  /* ########################### customers ################################## */
  .customers {
    height: 717px;
    top: 2395px;
  }

  .contents3 {
    position: relative;
    width: 321px;
    height: 717px;
    padding-top: 30px;
  }

  .title3 {
    width: 321px;
  }

  .web-img {
    display: none;
  }

  .mobile-img {
    display: block;
    padding-top: 80px;
    margin: auto;
    width: 100%;
  }

  /* ########################### footer ################################## */
  footer {
    height: 457px;
    z-index: -1;
    margin-top: 70px;
  }

  .footer-inner {
    position: relative;
    width: 100%;
    height: 443px;
    /* border: 1px solid palevioletred; */
    margin: auto !important;
    padding: 0 20px;
    margin-bottom: 57px !important;
  }

  .footer-logo {
    height: 43px;
    width: 260px;
    padding-top: 40px;
    float: left;
  }

  .footer-text {
    padding-top: 80px;
  }

  .contact-us {
    display: block;
    margin-top: auto !important;
    height: 130px;
    width: 100%;
    float: right;
    padding-top: 10px;
    border-top: 2px solid var(--highlight);
  }

  .contact-us p {
    font-size: 14px;
    margin: -1px !important;
    line-height: 1.55em;
  }

  .contactTitle {
    font-size: 20px;
    font-family: var(--indextitle);
    margin-bottom: -3px !important;
  }

  /* support-you box  */
  .footer-text2 {
    padding-top: 90px;
    display: block;
    float: none;
  }

  .support-you {
    display: auto !important;
    height: 100px;
    width: 100%;
    margin-top: 0px !important;
    margin-right: 0px !important;
    border-top: 2px solid var(--highlight);
  }

  .supportTitle {
    margin-top: 200px;
    font-size: 20px;
    font-family: var(--indextitle);
    margin-bottom: -3px !important;
    height: 32px;
  }

  .support-you p {
    font-size: 14px;
    margin: -1px !important;
  }

  .copyright {
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 57px;
    border-top: 2px solid var(--highlight);
    text-align: center;
    line-height: 57px;
    font-size: 14px;

  }

  .faq {
    right: 20px;
  }

}


/* ########################################################## tablet pc only ##################################################### */


@media (min-width: 769px) and (max-width: 1280px) {

  /* Default CSS */
  body {
    font-size: 18px;
    width: 100vw;
  }

  section {
    padding: 20px;
  }

  .upper-bg {
    height: 970px;
    z-index: -2;
  }

  .container {
    height: 3460px;
    overflow: hidden;
    position: relative;
  }


  /* ########################### section: Header ################################## */
  header {
    width: 100vw;
  }

  .header-inner {
    padding: 0 100px;
  }

  .gnb {
    display: none;
  }

  .hide-burger {
    display: block;
  }

  /* ############################################ side-bar ############################################# */
  .side-bar-bg {
    position: fixed;
    background-color: rgba(0, 0, 0, 0.4);
    width: 100vw;
    height: 100vh;
    left: 0;
    top: 0;
    z-index: -1;
  }

  #side-bar {
    position: fixed;
    right: 80px;
    width: 250px;
    height: 100vh;
    z-index: 998;
  }

  #side-bar a:hover {
    background-color: var(--primary);
    color: white;
  }

  #side-bar>a:nth-child(1) {
    top: 0%;
  }

  #side-bar>a:nth-child(2) {
    top: 25%;
  }

  #side-bar>a:nth-child(3) {
    top: 50%;
  }

  #side-bar>a:nth-child(4) {
    top: 75%;
  }

  .hide-bar {
    display: none;
  }

  .side-bar-content {
    display: block;

  }

  .side-bar-main {
    display: block;
    text-align: center;
    height: 10%;
    padding: 15% 0;
    font-size: 24px;
    font-family: var(textB);
    background-color: #eee;
    box-shadow: -4px 4px 10px #1f2023a4;
    transition: 0.3s;
  }

  .side-bar-sub {
    font-family: var(--textB);
    background-color: rgb(155, 155, 155);
    display: none;
  }

  .side-bar-sub a {
    display: block;
    padding: calc(25px/4);
    text-align: center;
  }

  .active-sidebar {
    background-color: var(--primary);
    color: white;
  }

  /* ########################### btn: contact ################################## */
  .contact {
    display: none;
  }

  /* ########################### section: Welcome ################################## */
  .welcome-slider>div {
    position: relative;
  }

  .slide-upper {
    width: 800px;
  }

  /* ########################### news ################################## */
  .news {
    position: absolute;
    top: 970px;
    height: 860px;
  }

  .contents {
    height: 131px;
    width: 321px;
  }

  .title1 {
    width: 321px;
    padding-top: 10px;
    position: relative;
  }

  .btn-more {
    width: 78px;
    margin-top: 20px;
    float: right;
  }

  .card {
    clear: both;
    width: 321px;
    height: 212px;
    margin-top: 40px;
  }

  .card:first-child {
    margin-top: 30px;
  }

  .card img {
    height: 131px;
    width: 321px;
  }

  .card table {
    width: 321px;
  }

  .card table tr {
    width: 321px;
  }

  /* ########################### solutions ################################## */
  .solutions {
    top: 1830px;
    height: 620px;
  }

  .solutions-inner {
    width: 100%;
  }

  .title2 {
    top: 15px;
  }

  .contents2 {
    position: relative;
    height: 589px;
    width: 321px;
    margin: auto;
  }

  .sol-img {
    flex-direction: column;

  }

  .sol-img a img {
    width: 321px;
    margin: 0 20px 20px 0;
  }

  /* ########################### customers ################################## */
  .customers {
    height: 717px;
    top: 2450px;
  }

  .contents3 {
    position: relative;
    width: 321px;
    height: 717px;
    padding-top: 30px;
  }

  .title3 {
    width: 321px;
    top: 15px;
  }

  .web-img {
    display: none;
  }

  .mobile-img {
    display: block;
    padding-top: 80px;
    margin: auto;
    width: 100%;
  }

  /* ########################### footer ################################## */
  footer {
    height: 300px;
  }

  .footer-inner {
    padding: 0 100px;
  }

  /* ############################ FAQ ####################################### */
  .faq {
    right: 20px;
  }
}