sass-site/source/assets/sass/components/_sass-syntax-switcher.scss

.ui-helper-reset {
  line-height: inherit;
}

@mixin -active-tab {
  margin: 0;

  a {
    color: var(--sl-color--pale-sky);
    cursor: text;
  }

  &::after,
  &::before {
    --tab-point: 10px;

    bottom: -3px;
    left: 50%;
    border: solid transparent;
    content: ' ';
    height: 0;
    width: 0;
    position: absolute;
    pointer-events: none;
  }

  &::after {
    border-color: transparent;
    border-bottom-color: var(--sl-color--code-background);
    border-width: var(--tab-point);
    margin-left: calc(var(--tab-point) * -1);
  }

  &::before {
    border-color: transparent;
    border-bottom-color: var(--sl-color--code-background-darker);
    border-width: calc(var(--tab-point) + 1px);
    margin-left: calc((var(--tab-point) + 1px) * -1);
  }
}

.ui-tabs {
  &,
  .ui-tabs-nav,
  .ui-tabs-nav li.ui-tabs-active,
  .ui-tabs-panel {
    padding: 0;
  }

  .ui-tabs-panel-inactive {
    display: none;
  }

  .ui-tabs-nav {
    font-size: var(--sl-font-size--small);
    margin-top: var(--sl-gutter--negative);
    margin-left: var(--sl-gutter--negative);

    a {
      border: 0;
      background: none;
    }

    a:focus {
      outline: 0 !important;
      border: none !important;
      box-shadow: none !important;
    }

    .ui-tabs-active {
      @include -active-tab;
    }

    li {
      float: left;
      margin: 0;

      &.css-tab {
        &,
        &.ui-tabs-active {
          margin-left: var(--sl-gutter--double);
        }

        a::before {
          color: var(--sl-color--regent-grey);
          content: '\21d2';
          font-size: var(--sl-font-size--large);
          font-weight: var(--sl-font-weight--bold);
          left: -1.2em;
          position: absolute;
          top: var(--sl-gutter--minus);
        }
      }
    }

    .ui-tabs-anchor {
      padding: var(--sl-gutter--minus) var(--sl-gutter);
    }
  }

  pre {
    margin-top: 0;
  }

  // Carefully calibrated so that the distance between two code blocks in the
  // syntax switcher is exactly equal to two lines, so there's no visual jitter
  // when switching between syntaxes.
  pre + pre {
    margin-top: var(--sl-gutter);
  }
}

.ui-widget.ui-widget-content,
.ui-widget-header,
.ui-state-default,
.ui-widget-content .ui-state-default,
.ui-widget-header .ui-state-default,
.ui-button,
html .ui-button.ui-state-disabled:hover,
html .ui-button.ui-state-disabled:active {
  border: 0;
}

.ui-widget-header {
  font-weight: inherit;
}

.ui-widget {
  font: inherit;
}

.ui-widget-content,
.ui-widget-header,
.ui-state-default,
.ui-widget-content .ui-state-default,
.ui-widget-header .ui-state-default,
.ui-button,
html .ui-button.ui-state-disabled:hover,
html .ui-button.ui-state-disabled:active {
  background: none;
}

.ui-widget-content,
.ui-widget-header {
  color: inherit;
}

.sl-c-callout {
  .ui-state-default,
  .ui-widget-content .ui-state-default,
  .ui-widget-header .ui-state-default,
  .ui-button,
  html .ui-button.ui-state-disabled:hover,
  html .ui-button.ui-state-disabled:active,
  .ui-state-default a,
  .ui-state-default a:link,
  .ui-state-default a:visited,
  a.ui-button,
  a:link.ui-button,
  a:visited.ui-button {
    color: inherit;
  }

  .ui-widget a {
    border: 0;
  }
}

.ui-tabs-panel > h3 {
  position: relative;
  top: 0.45rem;
  margin: 0;
  text-transform: uppercase;
  color: var(--sl-color--hopbush);

  &,
  * {
    font-size: var(--sl-font-size--small);
  }
}

@mixin -split-css-tabs {
  .ui-tabs.can-split {
    .ui-tabs-panel {
      &.scss,
      &.sass {
        width: calc(var(--split-location) - 5px);
        display: inline-block;

        &.ui-tabs-panel-inactive {
          display: none;
        }
      }

      &.css {
        width: calc(100% - var(--split-location) - 5px);
        float: right;

        &.ui-tabs-panel-inactive {
          display: block;
        }
      }
    }

    &.ui-tabs-panel-css-is-active {
      .scss,
      .sass {
        &.ui-tabs-panel.ui-tabs-panel-previously-active {
          display: inline-block;
        }
      }
    }

    .css-tab {
      position: absolute;
      left: calc(var(--split-location) - 1%);

      @include -active-tab;

      &,
      &.ui-tabs-active {
        margin-left: 0;
      }

      ::before {
        content: none;
      }
    }
  }
}

// custom breakpoint to make the split tabs work with a double nav column
@media screen and (width >= 93.75rem) {
  body.documentation {
    @include -split-css-tabs;
  }
}

// custom breakpoint to make the split tabs work with a single nav column
@media screen and (width >= 76rem) {
  body.guide {
    @include -split-css-tabs;
  }
}