$heading: rgba(255, 255, 255, 0.6);
$separator: rgba(255, 255, 255, 0.2);

%subheading {
  color: $heading;
  font-size: 0.8rem;
  font-weight: 400;
  margin: 0;
}

@mixin header {
  display: grid;
  grid-template-areas: "icon primary" "icon secondary";
  grid-template-rows: 1fr 1fr;
  grid-template-columns: 3rem 1fr;
  padding: 1rem;

  .site-name {
    grid-area: primary;
    padding-left: 1rem;
    font-size: 1.25rem;
    font-weight: unset;
    color: var(--site-primary);
    margin: 0;
    white-space: nowrap;
    overflow-x: hidden;
    text-overflow: ellipsis;
  }

  .admin-name {
    grid-area: secondary;
    color: white;
    padding-left: 1rem;
    @extend %subheading;
    opacity: 0.75;
    white-space: nowrap;
    overflow-x: hidden;
    text-overflow: ellipsis;
  }

  .site-icon {
    grid-area: icon;
    display: flex;
    background-color: var(--site-primary);
    color: var(--site-on-primary);
    width: 3rem;
    height: 3rem;
    align-items: center;
    justify-content: space-around;
    text-transform: capitalize;
    font-size: 2rem;
    border-radius: 0.25rem;
  }
}

%navigation {
  background: black;
  color: white;
  padding-bottom: 2rem;
  --site-link: white;

  > * {
    transition: opacity 0.25s;
  }

  &:not([aria-expanded]) {
    > * {
      opacity: 0;
    }
  }

  header {
    @include header;
    border-bottom: 1px solid $separator;
  }

  ul,
  li {
    padding: 0;
    list-style: none;
    font-size: var(--heading--h6);
  }

  .filter {
    margin: 1rem calc(1rem - 5px) 0;
    position: relative;

    input {
      width: 100%;
      border: none;
      border-radius: 1px;
    }

    // keyboard shortcut
    &::after {
      content: "G";
      position: absolute;
      display: block;
      top: 4px;
      bottom: 4px;
      right: 4px;
      width: auto;
      border-radius: 2px;
      border: 1px solid #aaa;
      color: #888;
      padding: 6px 0.3rem 0 0.3rem;
      font-size: 0.8rem;
      pointer-events: none;
    }

    &:has(input:focus),
    &:has(input:hover) {
      &::after {
        opacity: 0;
      }
    }
  }

  li > span {
    display: block;
    padding: 1.25rem 1rem 0.25rem;
    color: $heading;
  }

  > ul > li > span {
    border-top: 1px solid $separator;
    margin-top: 1rem;
    padding: 1.25rem 1rem 0.25rem;
    @extend %subheading;
  }

  li li li > a[href] {
    padding-left: 2.5rem;
  }

  li > a[href] {
    display: block;
    padding: 0.75rem 1rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  li > a[href]:hover,
  li > a[href]:focus {
    background: rgba(255, 255, 255, 0.2);
    text-decoration: none;
  }
}

.navigation-collapse {
  width: 2rem;
  border-radius: 50%;
  margin-top: 1rem;
  justify-self: right;
  align-self: start;
  background-color: white;
  box-shadow: 0px 1px 7px 2px rgba(0, 0, 0, 0.1);
  visibility: hidden;
  opacity: 0;
  transform: translateX(50%);
  transition:
    opacity 0.25s,
    background-color 0.25s;
  cursor: pointer;

  nav[aria-expanded] + & {
    transform: translateX(50%) rotate(180deg);
  }

  nav:hover + &,
  &:hover {
    visibility: visible;
    opacity: 1;
  }

  &:hover {
    background-color: var(--site-primary);
  }
}