:root {
  --sidebar-width: 3.75rem;
  
  @media screen and (min-width: 1024px) {
    --sidebar-width: 6.25rem;
  }
}

.header {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 99;
  width: calc(100% - var(--sidebar-width));
}

.sidebar {
  width: var(--sidebar-width);
  box-shadow: var(--elevation);
  position: fixed;
  top: 0;
  right: 0;
  height: 100%;
  background-color: var(--white);
}

.header-nav__trigger {
  display: flex;
  cursor: pointer;
  position: relative;
  background: var(--grad-green);
  padding-top: 2.5rem;
  padding-bottom: 2rem;

  & .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: 6rem;
  padding-right: var(--sidebar-width);
  height: 100%;
  width: 100%;
  background-color: var(--dark-green);
  transition: all 400ms ease;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  z-index: -1;
  color: var(--ink);
}

.header-menu {
  position: relative;
  
  & .header-menu__trigger {
    cursor: pointer;
  }
  
  & .header-menu__content {
  	transition: all 400ms ease;
    position: absolute;
    bottom: 8px;
    right: calc(100% + 8px);
    min-width: 160px;
  }
}

@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;
}