// Back to top link
//
// The one and only anchor link that brings user back to top
// when hitting the rock bottom.

.site-footer .top {
  background-color: transparent;

  // Makes it 50x50
  padding: 16px;

  svg {
    align-items: center;
    display: flex;
    fill: var(--color-top-arrow-dark);
    height: 18px;
    justify-content: center;
    margin: 0;
    opacity: .8;
    transition: all .3s ease;
    width: 18px;

    @media (max-width: $container-mobile) {
      height: 15px;
      width: 15px;
    }
  }

  &:hover,
  &:focus,
  &:active {
    opacity: 1;

    svg {
      transform: translateY(-.5rem);
    }
  }
}

.site-footer .back-to-top {
  align-items: center;
  bottom: 1rem;
  display: flex;
  justify-content: center;
  margin: 0;
  opacity: 0;
  position: fixed;
  right: 1rem;
  text-decoration: none;
  transition: opacity $transition-duration 0s, visibility 0s $transition-duration;
  z-index: 9999;

  // Accessibility: Change color based on background color the element is on
  &.has-light-bg svg {
    fill: var(--color-top-arrow-dark);
  }

  &.has-dark-bg svg {
    fill: var(--color-top-arrow-light);
  }

  &.is-visible,
  &.fade-out {
    transition: opacity $transition-duration 0s, visibility 0s 0s;
  }

  &.is-visible { // The button becomes visible
    opacity: 1;
  }

  &.fade-out { // If the user keeps scrolling down, the button is out of focus and becomes less visible
    opacity: 1;

    &:focus,
    &:hover {
      opacity: 1;
    }
  }
}