Main Menu: Academics

.main-nav {
    background-color: $lehigh-brown;

  .main-menu {
    display: flex;
    flex-direction: column;
    border-top: 2px solid $white;
    @include reset-list-nav;

    @media (min-width: $break-desktop) {
      flex-direction: row;
      justify-content: flex-end;
      border: 0;
    }

    &__item {
      margin: 0;
      border-top: 1px solid $white;
      @media (min-width: $break-desktop) {
        margin: 0 $space-double 0 0;
        border: 0;
      }

    }

    .main-menu__link {
      width: 100%;
      padding: 0.5em 1em;
      border: 0;
      font-size: 1.5rem;
      color: $white;
      background-color: transparent;
      @media (min-width: $break-desktop) {
        width: auto;
        padding: 0;
      }

      &:hover,
      &:focus {
        text-decoration: none;
        color: $gold;
      }

      &--with-sub {
        &::after {
          position: relative;
          left: 3px;
          color: $white;
          display: inline-block;
          content: "\f107";
          font-family: $font-awesome;
          transform: rotate(-90deg);
          @media (min-width: $break-desktop) {
            transform: rotate(0);
          }
        }
      }

      &--sub {
        &:hover,
        &:focus {
          text-decoration: underline;
        }
      }
    }

    &--sub-nav {
      position: absolute;
      top: 10rem;
      left: 0;
      height: inherit;
      width: 100%;
      background-color: rgba(255, 255, 255, 0.9);
      backdrop-filter: blur(10px);

      .menu-toggle__toggleable-content-wrapper {
        padding: $space-double;
        @media (min-width: $break-desktop) {
          padding: 0 $space-triple $space-quintuple;
          height: 80vh;
          overflow-y: auto;
          text-align: center;
        }
      }

      &.show {
        visibility: visible;
      }

      .main-menu--sub {
        list-style: none;
        margin: $space-double 0 0 0;
        padding: 0;
        @media (min-width: $break-desktop) {
          margin: $space-quintuple 0 0 0;
          padding: 0 $space-quadruple 0 0;
          display: inline-block;
          vertical-align: top;
          text-align: left;
        }

        li {
          &.title {
            color: $grey_dark;
            font-size: 1.5rem;
            font-weight: bold;
            margin: 0 0 $space 0;

            a {
              color: $grey_dark;
              font-size: 1.5rem;
              font-weight: bold;
              margin: 0 0 $space 0;
              text-decoration: none;

              &:hover {
                text-decoration: none;
              }
            }
          }

          &.sub-title {
            color: $black;
            font-size: 1.25rem;
            font-weight: bold;
            margin: 1.5rem 0 $space-one-half 0;

            a {
              color: $black;
              font-size: 1.25rem;
              font-weight: bold;
              margin: 1.5rem 0 $space-one-half 0;
              text-decoration: none;

              &:hover {
                text-decoration: none;
              }
            }
          }

          margin: 0 0 $space-one-fourth 0;

          .main-menu__link {
            color: $black;
            font-size: 1.25rem;
          }

          &:last-of-type {
            margin: 0;
          }
        }
      }

      .main-menu--stacked {
        display: flex;
        flex-direction: column;

        .main-menu--sub {
          &:last-of-type {
            margin: $space-quadruple 0 0 0;

            li {
              margin: $space-one-half 0;

              &:last-of-type {
                margin: $space-one-half 0 0 0;
              }
            }
          }
        }
      }

      .decoration {
        display: none;
        position: absolute;
        bottom: 0;
        right: 0;
        overflow: hidden;
        @media (min-width: $break-desktop) {
          display: block;
        }

        &::before {
          content: '';
          display: block;
          position: relative;
          top: 0;
          width: 0;
          height: 0;
          border-top: 200px solid transparent;
          border-right: 200px solid $lehigh-brown;
        }
      }
    }
    .two {
      .decoration {
        &::before {
          border-right: 200px solid $red;
        }
      }
    }
  }

  .js-menu-toggle__toggleable__close {
    @include css-art--x;
    position: absolute;
    top: $space-double;
    right: $space-double;
    width: $space-double;
    height: $space-double;
    border: 0;
    background: transparent;
    appearance: none;
    cursor: pointer;

    // Change close icon color
    &:hover,
    &:focus {
      &:before,
      &:after {
        background: $blue_k60;
      }
    }
  }
}

.sticky .main-nav .main-menu--sub-nav {
  position: fixed;
  top: 121px;
}

// Open and Shut Styles
// -----------------------------------------------------------------------------
/// Visibility has to have a different delay on default state vs open state
/// Adding mixin so transitions are managed in one place instead of 2
@mixin main-menu__item__transitions($is-open: true) {
  $visibility-delay: 0s;
  @if $is-open == false {
    $visibility-delay: 0.4s;
  }
  transition: visibility 0s $visibility-delay;
  @media (min-width: $break-desktop) {
    // sass-lint:disable indentation
    transition:
      visibility 0s $visibility-delay,
      height 0.25s ease-out,
      box-shadow 0.4s ease-out;
    // sass-lint:enable indentation
  }
}

%main-menu__item--shut {
  @include main-menu__item__transitions(false);
  position: absolute;
  top: 0;
  left: 100vw;
  z-index: -2;
  width: 100%;
  // Last number is measured height of mobile header
  min-height: calc(100vh - 139px);
  max-height: calc(100vh - 139px);
  visibility: hidden;
  overflow-y: scroll;
  @media (min-width: $break-desktop) {
    position: absolute;
    top: 100%;
    left: 50%;
    height: 0;
    min-height: 0;
    max-height: 99999em;
    overflow: hidden;
    transform: translate(-50%);
  }
}

.main-nav .main-menu--sub-nav {
  .main-menu__item--sub {
    background-color: $white;
  }

  &.js-menu-toggle__toggleable--open {
    .main-menu__item--sub {
      background-color: inherit;
    }
  }
}

%main-menu__item--open {
  @include main-menu__item__transitions();
  // Default, it'll be overridden by JS
  overflow-y: scroll;
  visibility: visible;
  @media (min-width: $break-desktop) {
    height: calc(100vh - #{vr(4)});
  }

  .js & {
    box-shadow: 0 18px 54px 18px rgba($black, 0.22);
  }

  // If there's a height style on the tag JS has height, so we don't need scroll
  &[style*='height'] {
    @media ($break-desktop) {
      overflow: hidden;
    }
  }

}

// No JS solution
// sass-lint:disable no-mergeable-selectors
.main-menu__link--toggle {
  ~ .menu-toggle__toggleable {
    @extend %main-menu__item--shut;
  }

  &:checked ~ .menu-toggle__toggleable {
    @extend %main-menu__item--open;
  }
}

// JS Solution (which is more accessible)
.main-menu--sub-nav {
  &.js-menu-toggle__toggleable {
    @extend %main-menu__item--shut;
  }

  &.js-menu-toggle__toggleable--open {
    @extend %main-menu__item--open;
  }
}
// sass-lint:enable no-mergeable-selectors