.header {
  position: sticky;
  top: 0;
  z-index: 99;
  padding: 1.5rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 2rem;
  border-bottom: 1px solid hsl(from var(--ink) h s l / 40%);
  background-color: var(--off-white);
  @media (min-width: 768px) {
    padding-left: 2.5rem;
    padding-right: 2.5rem;
  }
  @media (min-width: 1200px) {
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
  }
  
  & .header__logo {
    flex: 1 1 0;
    & a {
      display: block;
      width: 6.5rem;
      & img {
        width: 100%;
      }
    }
    @media (min-width: 1200px) {
      flex: 0 0 auto;
      width: 30rem;
      & a {
        width: 8.875rem;
      }
    }
  }
  
  & .header__contact-buttons {
    display: none;
    width: 30rem;
    align-items: center;
    justify-content: end;
    gap: 0.5rem;
    @media (min-width: 1200px) {
      display: flex;
    }
  }
}

.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(--ink);
    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(--ink);
      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(--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 {
    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;
}