@media screen and (max-width: 768px) {
  .header-content {
    width: 90%;
    padding: 16px 0 16px;
  }

  .left-header, .right-header {
    display: none;
  }

  .mobile-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
  }

  .mobile-header .logo {
    display: block;
    height: 40px;
  }

  .mobile-header .nav-links {
    justify-content: right;
    display: flex;
    width: 100%;
  }
 .mobile-header .nav-link {
    font-style: normal;
    font-weight: bold;
    font-size: 16px;
    line-height: 19px;
    padding-left: 5px;
    color: #FFFFFF;
    flex: 1;
    text-align: right;
    vertical-align: middle;
  }

  .mobile-header .nav-link > a,
  .mobile-header .nav-link > a:link,
  .mobile-header .nav-link > a:visited,
  .mobile-header .nav-link > a:hover {
    text-decoration: none;
    color: #FFFFFF;
  }

  main .card {
    width: 90%;
    padding: 24px 0 0 0;
  }

  .card h2 {
    font-size: 20px;
    line-height: 1.2;
    padding: 14px 97px 0 5.71%;
    text-align: left;
  }

  .card .introduction {
    margin: 30px 24px 16px;
    width: auto;
    text-align: left;
    font-size: 14px;
    line-height: 1.57;
    font-weight: 400;
  }

  .card .download-buttons {
    margin-bottom: 24px;
    flex-direction: column;
    gap: 34px;
  }

  .card #introduction-image {
    top: 13px;
    width: 97px;
    height: 102px;
  }

  .card .bottom {
    padding: 40px 24px;
    flex-direction: column;
    text-align: center;
  }

  .card .bottom .requirements {
    width: 100%;
    margin-top: 24px;
  }

  .card .bottom .requirements p {
    display: flex;
    text-align: left;
  }
  .card .bottom .requirements p:not(:last-child) {
    margin-bottom: 24px;
  }

  .card .bottom .requirements span {
    flex: 1;
    margin-right: 16px;
    max-width: 95px;
  }

  .guide-section {
    padding: 40px 0 40px;
  }

  .guide-contents {
    width: 90%;
  }

  .guide-contents h2 {
    font-size: 16px;
  }

  .guide-contents > div {
    flex-direction: column;
    margin-top: 16px;
  }

  .guide-contents .menu {
    width: 100%;
    max-width: 100%;
    flex: none;
  }

  .guide-contents .menu ul {
    display: none;
  }

  .guide-contents .menu .mobile-menu {
    display: block;
    position: relative;
    width: 100%;
    background-color: rgb(44, 49, 52);
    border-radius: 10px;
  }

  .guide-contents .menu .mobile-menu select {
    width: 100%;
    height: 64px;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    margin: 0;
    background-color: rgb(44, 49, 52);
    border: 0;
    outline: 0;
    padding-left: 24px;
    font-size: 18px;
    font-weight: 500;
    text-decoration: none;
    color: rgb(246, 94, 114);
  }

  .guide-contents .menu div.mobile-menu::after {
    display: block;
    position: absolute;
    width: 14px;
    height: 8px;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    content: " ";
    background: url(../assets/images/chevron_down.png) 0 0 no-repeat;
    background-size: contain;
  }

  .guide-contents .menu .mobile-menu option:not(:checked) {
    color: #fff;
  }

  .guide-contents .articles {
    margin: 32px 0 0;
  }

  .guide-contents article h2 {
    font-size: 24px;
    margin-bottom: 0;
  }

  .guide-contents article h3 {
    font-size: 18px;
  }

  .guide-contents article h4 {
    margin: 0 0 8px;    
  }

  .guide-contents article p {
    margin: 0 0 16px;
  }

  .guide-contents article img {
    margin: 0 0 16px;
  }

  .pre-footer h4 {
    font-size: 18px;
  }

  .pre-footer-inner {
    width: 90%;
    padding-top: 40px;
    padding-bottom: 48px;
  }

  .pre-footer-inner .products {
    flex-direction: column;
  }

  .pre-footer-inner .products a {
    line-height: 0;
  }

  .pre-footer-inner .products a:not(:last-child) {
    margin-bottom: 24px;
  }

  .pre-footer-inner .products img {
    width: 100%;
  }

  footer .footer-inner {
    flex-direction: column;
    padding: 40px 0;
    height: 197px;
  }

  footer .footer-inner .company {
    flex-direction: column;
  }

  footer .footer-inner .company span {
    margin: 16px 0 0;
  }
}