@media screen and (max-width:1200px) {

  /* ナビゲーション */
  header .mainNav {
    position: fixed;
    top: 0;
    width: 100%;
    height: calc(var(--dvh, 1vh) * 100);
    padding-top: 30px;
    padding-bottom: 60px;
    background-color: #fff;
    overflow: auto;
  }
  header .mainNav.display {
    left: 0;
    opacity: 1;
    visibility: visible;
    transition: left 0.3s 0.1s, opacity 0.3s 0.3s, visibility 0.1s;
  }
  header .mainNav.hidden {
    left: -100%;
    opacity: 0;
    visibility: hidden;
    transition: left 0.3s 0.3s, opacity 0.3s, visibility 0.1s 0.6s;
  }
  header .mainNav .innerLinks {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    max-width: 600px;
    margin: 0 auto;
  }
  header .mainNav .innerLinks li {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 75px;
    margin-top: 10px;
    border-bottom: 1px solid rgb(51, 51, 51, 0.2);
  }
  /* ナビゲーションバナー */
  header .navigationBanner {
    display: flex;
    justify-content: end;
    align-items: center;
    margin-top: 30px;
  }
  header .navigationBanner img {
    width: 35px;
  }

  /* ナビゲーションボタン */
  header .navBtn {
    display: block;
  }
  header .navBtn .item {
    position: absolute;
    left: 50%;
    height: 1px;
    background-color: #333333;
  }
  /* 未選択時 */
  header .navBtn .item {
    width: 100%;
    transition: top 0.3s 2s, opacity 0.3s 2s, transform 2s, width 0.3s 2s;
  }
  header .navBtn .item:nth-child(1) {
    top: calc((100% / 6) * 2);
    transform: translate(-50%, -50%) rotate(0deg);
  }
  header .navBtn .item:nth-child(2) {
    top: 50%;
    opacity: 1;
    transform: translate(-50%, -50%);
  }
  header .navBtn .item:nth-child(3) {
    top: calc((100% / 6) * 4);
    transform: translate(-50%, -50%) rotate(0deg);
  }
  /* 選択時 */
  header .navBtn.selected .item {
    width: calc(100% - 10px);
    transition: top 0.3s, opacity 0.3s, transform 2s, width 0.3s;
  }
  header .navBtn.selected .item:nth-child(1) {
    top: 50%;
    transform: translate(-50%, -50%) rotate(calc((360deg * 6) + 45deg));
  }
  header .navBtn.selected .item:nth-child(2) {
    top: 50%;
    opacity: 0;
    transform: translate(-50%, -50%);
  }
  header .navBtn.selected .item:nth-child(3) {
    top: 50%;
    transform: translate(-50%, -50%) rotate(calc((360deg * -3) - 45deg));
  }

  /* フッター */
  footer .innerLinks,
  footer .externalLink {
    width: 260px;
    justify-content: start;
    margin-left: auto;
  }
  footer .innerLinks li {
    margin: 15px 0;
  }
  footer .innerLinks button {
    width: 110px;
  }
  footer .externalLink {
    padding: 0;
  }
  footer .externalLink li {
    margin-right: 35px;
  }
  footer .externalLink .snsIcon {
    width: 35px;
    height: 35px;
    margin: 0;
  }
}