sass-site/source/assets/css/components/_lists.scss

.sl-c-list {

  &,
  &-horizontal-wrapper ul,
  &-navigation-wrapper ul {
    margin: 0;
    padding: 0;
    list-style: none;
  }

  &-horizontal-wrapper {

    @include sl-breakpoint--large {

      ul {
        display: flex;
        margin: {
          right: -0.5rem;
          left:  -0.5rem;
        };
      }

      li {
        padding: {
          right: .5rem;
          left:  .5rem;
        };
      }
    }
  }

  &-navigation-wrapper {
    position: relative;

    li {
      margin: .5rem 0;
      line-height: 1.25;
    }

    &--collapsible {
      ul ul a { padding-left: 1rem; }
      ul ul ul a { padding-left: 2rem; }
      ul ul ul ul a { padding-left: 3rem; }

      a {
        border: none;
        cursor: pointer;
        display: block;
        margin: -0.5rem 0;
        padding: 0.3rem;
        width: 100%;

        &:hover { background-color: $sl-color--dawn-pink; }
      }

      li.overview a {
        font-size: $sl-font-size--small;
        &:not(.selected) { color: transparentize($sl-color--midnight-blue, 0.5); }
      }

      li a {
        &.section {
          &::after {
            content: "▶";
            float: right;
            font-size: 0.5em;
            text-align: center;
            margin-top: 5px;
            transition: transform 0.1s;
            width: 19px;
          }

          &.open::after { transform: rotate(90deg); }

          + ul { display: none; }
          &.open + ul { display: block; }
        }

        &.selected {
          font-weight: bold;
          &:not(.section) { background-color: $sl-color--dawn-pink; }
        }
      }
    }
  }
}

.sl-c-description-list--horizontal {
  margin: {
    right: -1rem;
    left: -1rem;
  };

  &,
  > div { display: flex; }

  > div {
    border-left: 1px solid $sl-color--iron;
    padding: 0 1rem;

    &:first-child { border: 0; }
  }

  .compatibility {
    font-weight: 600;
    opacity: 0.5;

    + div { border: 0; }
  }

  dt,
  dd {
    padding-left: 1rem;

    &:first-child { padding-left: 0; }
  }

  &.impl-status {
    font-size: 0.8em;
    margin-top: -1em;

    a {
      transition: transform 0.1s;
      border-bottom: none;
      background: none;
      cursor: pointer;
      width: 19px;
      text-align: center;
      transform-origin: 8px 11px;

      &.expanded { transform: rotate(90deg); }
    }
  }
}