$placeholder-bg-size: 450px;

/*
 * Base carbon ads style
 */

@mixin carbon-style {
  .carbon-img,
  .carbon-text,
  .carbon-poweredby {
    text-decoration: none;
  }

  // Increase hit area
  .carbon-text,
  .carbon-poweredby {
    padding-top: 4px;
    padding-bottom: 4px;
  }

  .carbon-img > img {
    width: 83px; // 13:10 ratio
    height: 64px;
    box-shadow: $shadow3;
    border-radius: 3px;
    background: rgba($gray-text, 0.2);
    color: transparent;
  }

  .carbon-img:hover img {
    transform: translate3d(0, -1px, 0);
    box-shadow: $shadow6;
  }

  .carbon-text,
  .carbon-text:visited {
    color: $base-text;
  }

  // Allow line breaks
  .carbon-text::after {
    content: '  ';
  }

  .carbon-text:hover,
  .carbon-poweredby:hover {
    color: $base-b;
  }

  .carbon-poweredby,
  .carbon-poweredby:visited {
    white-space: nowrap;
    color: $gray-text;
  }
}

/*
 * Carbon ads
 *
 *     .HeadlinePub
 *       div#carbonads
 *         span
 *           span.carbon-wrap
 *             a.carbon-img > img
 *             a.carbon-text {description}
 *           a.carbon-poweredby {powered by Carbon}
 */

.HeadlinePub {
  @include carbon-style;

  & {
    position: relative;
    display: block;
    margin-left: auto;
    margin-right: auto;
  }

  // Hide placeholders after carbon has loaded
  #carbonads ~ .placeholder {
    opacity: 0;
    transition: opacity 250ms linear;
    pointer-events: none;
  }

  & > .placeholder {
    background-image: linear-gradient(
      92deg,
      rgba($gray-text, 0.1),
      rgba($gray-text, 0.17) 15%,
      rgba($gray-text, 0.1) 30%
    );
    background-size: $placeholder-bg-size 100%;
    animation: 2.5s ease-in-out infinite placeholder-swish;
    border-radius: 3px;
    position: absolute;
    display: block;
  }

  & > .placeholder.-one {
    left: 0;
    top: 0;
    width: 83px;
    height: 64px;
  }

  & > .placeholder.-two,
  & > .placeholder.-three,
  & > .placeholder.-four {
    left: 99px;
    top: 6px;
    height: 8px;
    width: 280px;
  }

  & > .placeholder.-three {
    top: 28px;
  }

  & > .placeholder.-four {
    top: 50px;
    width: 80px;
  }

  // Make the ad show up above the placeholder
  #carbonads {
    position: relative;
    z-index: 1;
  }

  // Carbon wrapper
  &,
  & > div > span {
    display: block;
    width: 380px;
    height: 64px;
    text-align: left;
  }

  .HighlightPubFirstLine & > div > span:first-line {
    font-weight: bold;
  }

  // Clearfix
  & > div > span::after {
    content: '';
    display: table;
    clear: both;
    zoom: 1;
  }

  .carbon-img {
    float: left;
    margin-right: 16px;
  }
}

#carbonads {
  animation: 250ms ease-out pub-text-enter;
}

@keyframes placeholder-swish {
  0% {
    background-position: ($placeholder-bg-size * -1 / 3) 0%;
  }

  50% {
    background-position: ($placeholder-bg-size * 2 / 3) 0%;
  }

  100% {
    background-position: ($placeholder-bg-size * 2 / 3) 0%;
  }
}

@keyframes pub-text-enter {
  0% {
    opacity: 0;
    transform: scale(0.97);
  }

  100% {
    opacity: 1;
  }
}