.header {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 99;
  display: grid;
  grid-template-areas: "logo menu";
  grid-template-columns: 1fr auto;
  gap: 2rem;
  
  @media (min-width: 768px) {
    grid-template-areas: "menu logo contact";
    grid-template-columns: 1fr auto 1fr;
  }
  
  & .menu {
    grid-area: menu;
  }
  & .logo {
    grid-area: logo;
  }
  & .contact {
    grid-area: contact;
  }
}

.header-nav__trigger {
  width: 3rem;
  height: 3rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  cursor: pointer;
  position: relative;
  font-size: 0.75rem;
  letter-spacing: 0.32em;
  line-height: 1.25;
  font-family: var(--font-sans);
  font-weight: 300;
  text-align: center;
  color: var(--snow);

  & .header-nav__trigger-toggle {
    height: 1px;
    width: 2.75rem;
    display: block;
    background-color: var(--white);
  }
  & .header-nav__trigger-toggle-2 {
    height: 1px;
    width: 1.875rem;
    display: block;
    background-color: var(--white);
  }
}

.header-nav__content {
  position: fixed;
  top: 0;
  left: 0;
  padding-top: 6rem;
  height: 100%;
  width: 100%;
  background-color: var(--white);
  transition: all 400ms ease;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  z-index: -1;
  color: var(--ink);
}

@media screen and (min-width: 1200px) {
  .header-nav__content,
  .header-nav__trigger {
  }
}

/** Keyframes **/
@keyframes toggler-top-open {
  0% {
    transform: translateY(6px);
  }

  30% {
    transform: translateY(0);
  }

  to {
    transform: translateY(0);
  }
}

@keyframes toggler-bottom-open {
  0% {
    transform: translateY(-6px);
  }

  30% {
    transform: translateY(0);
  }

  to {
    transform: translateY(0) rotate(90deg);
  }
}

@keyframes toggler-bottom {
  0% {
    transform: translateY(0);
  }

  30% {
    transform: translateY(0);
  }

  to {
    transform: translateY(6px);
  }
}

@keyframes toggler-top {
  0% {
    transform: translateY(0) rotate(90deg);
  }

  30% {
    transform: translateY(0);
  }

  to {
    transform: translateY(-6px);
  }
}

/**
 * 開発時にLoading Spinnerで隠れないようにするためのスタイル
 */
.loading-spinner {
  display: none;
}