Homepage Hero

//TODO gather these into settings and make sure shared everywhere they need to be
// need to make work with logowidth settings in mixins.scss
$startTextOverlay: 20em;
$startCollapsedCaption: $startTextOverlay;
$introMediumHeightBreakpoint: 800px;
$introSmallHeightBreakpoint: 700px;
$introTinyHeightBreakpoint: 650px;

.image-lead {
  @include respond-to($grid-breakpoint-s) {
    min-height: 500px;
    // on the homepage, the main is under the image lead, so it needs some spacing
    .enhanced & + .wt-grid-main,
    .enhanced & + .scroll-link + .wt-grid-main {
      // there may be a scroll link between the lead and the main
      margin-top: $grid-typo-spacing-m;
    }
  }
  background: $black;
  border-bottom: solid $grid-typo-spacing-xxs $ncLighterBlue;
  overflow: hidden;
  position: relative;

  img {
    height: auto;
    width: 100%;
  }
}

.image-lead__intro-container {
  box-sizing: border-box;

  .enhanced & {
    @include rem(padding-left, $grid-typo-spacing-xs);
    @include rem(padding-right, $grid-typo-spacing-xs);

    @include respond-to($grid-breakpoint-s) {
      left: 0;
      top: $grid-typo-spacing-xxl + $grid-typo-spacing-xl;
    }

    @include respond-to($grid-breakpoint-m) {
      top: $grid-typo-spacing-xxl + $grid-typo-spacing-xl + $grid-typo-spacing-l;
    }

    @media all and (max-height: $introMediumHeightBreakpoint) and (min-width: $grid-breakpoint-s) {
      top: $grid-typo-spacing-xxl + $grid-typo-spacing-xl;
    }

    @media all and (max-height: $introSmallHeightBreakpoint) and (min-width: $grid-breakpoint-s) {
      top: $headerHeightSticky + $secondaryNavHeight + $grid-typo-spacing-l;
    }

    @media all and (max-height: $introTinyHeightBreakpoint) and (min-width: $grid-breakpoint-s) {
      .image-lead__intro-text {
        @include rem(padding, 18px 18px 18px 18px);
        font-family: $supplementaryFont;
        font-size: $leadIntroFontSizeSmall;
        line-height: $leadIntroLineHeightSmall;
        width: 2 * $column + 2 * $column-padding;
      }
    }

    @media print {
      position: static;
    }
    bottom: 0;
    position: absolute;
    width: 100%;
  }
}

.image-lead__intro {
  height: 100%;
  z-index: 2;
}

.image-lead__intro-text {
  @include rem(padding, 18px);
  @include font-size-with-line-height(
    $leadIntroFontSizeSmall,
    $leadIntroLineHeightSmall
  );

  @include respond-to($grid-breakpoint-s) {
    font-size: $leadIntroFontSize;
    line-height: $leadIntroLineHeight;
  }
  background: $leadIntroBackgroundColour;
  border-top: 0;
  color: $white;
  font-family: $supplementaryFont;

  .enhanced & {
    @include respond-to($grid-breakpoint-s) {
      margin: 0;
      min-height: auto;
      width: 4 * $column;
    }

    @media print {
      width: auto;
    }
    width: auto;
  }
}

// here we create a class for each of the brand colours so that DCPs can choose the background colour of the itro in Drupal
@each $name, $colour in $brandColours {
  @include classWithColourModifierForProperty(
    'image-lead__intro-text',
    $name,
    $colour,
    background
  );
}

.image-lead__caption-container {
  .enhanced & {
    @include respond-to($startCollapsedCaption) {
      bottom: 0;
      left: 0;
      position: absolute;
      width: 100%;
    }
    color: $white;

    a {
      color: $white;
      &:hover {
        color: $ncOrange;
      }
    }

    &:before {
      @include gradientBackgroundWithOffset(0);
      @include rem(padding-bottom, $grid-typo-spacing-xl);

      @media print {
        content: none;
      }
      bottom: 0;
      content: '';
      height: $headerHeightNormal;
      position: absolute;
      width: 100%;
    }
  }
}

.enhanced {
  .image-lead__caption-text {
    @include font-size-with-line-height(
      $smallTextFontSize,
      $grid-spacing-unit * 3
    );
    @include rem(padding-top, $grid-spacing-unit);
    box-sizing: border-box;
    margin-bottom: $grid-typo-spacing-m;
    max-width: 8 * $column;
    position: relative;
    // hide the text but lay it out anyway as that keeps the gradient
    visibility: hidden;
    z-index: 1;

    @include respond-to($grid-breakpoint-s) {
      visibility: visible;
    }
  }
}

.image-lead__image-container,
.image-lead__caption-container {
  display: none;

  .enhanced & {
    display: block;
  }
}

.enhanced .image-lead__image-container {
  filter: blur(30px) brightness(110%);
  opacity: 0.7;
}

.enhanced .image-lead__image-container--loaded {
  filter: none;
  opacity: 1;
}

.button.scroll-link {
  @include largeArrowButton('down');
  bottom: 0;
  display: none;
  opacity: 1;
  padding: 0;
  position: absolute;
  right: 0;
  transform: scale(1);
  transition: transform $hoverTransLength, opacity $hoverTransLength;
  z-index: 100; // to infinity and beyond

  @include rem(min-width, $grid-typo-spacing-l); // ovverides button classes

  @include respond-to($grid-breakpoint-s) {
    display: block;
  }

  @media print {
    display: none;
  }
}

.scroll-link--hidden {
  opacity: 0;
  transform: scale(0);
}