.header {
  position: absolute;
  inset: 0 0 auto;
  z-index: 99;
  display: flex;
  gap: 1.5rem;
  align-items: end;
  padding: 2rem 1.25rem 1.25rem;
  @media (min-width: 1200px) {
    padding-inline: 2.5rem 0;
  }
  
  & .header-links {
    display: none;
    gap: 2rem;
    position: relative;
    padding: 0 2.5rem 0.75rem 1.5rem;
    line-height: 1.25;
    font-size: 1.25rem;
    @media (min-width: 1200px) {
      display: flex;
    }
    &::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: 0;
      width: 100%;
      height: 4px;
      opacity: 80%;
      background-image: 
        repeating-linear-gradient(
          90deg,
          var(--snow) 0px,
          var(--snow) 1px,
          transparent 1px,
          transparent 8px
        ),
        linear-gradient(
          to top,
          var(--snow) 1px,
          transparent 1px
        );
      background-size: 
        100% 3px,
        100% 4px;
      background-position: 
        top left,
        bottom left;
      background-repeat: 
        repeat-x,
        no-repeat;
    }
  }
}

.header-nav__trigger {
  width: 3rem;
  height: 3rem;
  display: flex;
  cursor: pointer;
  position: relative;

  & .header-nav__trigger-toggle {
    top: 50%;
    left: 50%;
    transform-origin: center;
    transform: translate(-50%, -50%);
    border-radius: 1px;
    height: 2px;
    width: 1.25rem;
    display: block;
    background-color: var(--white);
    position: absolute;
    transition: all 150ms ease;

    &::before,
    &::after {
      content: "";
      top: 0;
      left: 0;
      border-radius: 1px;
      height: 2px;
      width: 1.25rem;
      display: block;
      background-color: var(--white);
      position: absolute;
      transition: all 150ms ease;
    }

    &::before {
      animation: toggler-top 800ms ease forwards;
    }

    &::after {
      animation: toggler-bottom 800ms ease forwards;
    }
  }

  &.active .header-nav__trigger-toggle {
    transition-delay: 200ms;
    transform: translate(-50%, -50%) rotate(135deg);

    &::before {
      animation: toggler-top-open 800ms ease forwards;
    }

    &::after {
      animation: toggler-bottom-open 800ms ease forwards;
    }
  }
}

.header-nav__content {
  position: fixed;
  top: 0;
  left: 0;
  padding-top: 10rem;
  height: 100%;
  width: 100%;
  background-color: var(--ink);
  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 {
    display: none;
  }
}

/** 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;
}