// Elevator - Scroll back to top utility CSS
// ==========================================

.elevator {
  display: inline-block;
  height: 48px;
  width: 48px;
  position: fixed;
  right: 20px;
  bottom: 20px;
  box-shadow: 0 0 10px fade(black, 5%); // rgba(0, 0, 0, 0.05);
  overflow: hidden;
  white-space: nowrap;
  cursor: pointer;
  border-radius: 50%;
  text-decoration: none;
  background-image: none;
  background: fade(black, 70%); // rgba(0, 0, 0, 0.7);
  -webkit-transition: all 0.3s ease;
  -moz-transition: all 0.3s ease;
  -ms-transition: all 0.3s ease;
  -o-transition: all 0.3s ease;
  transition: all 0.3s ease;
  visibility: hidden;
  opacity: 0;
  &.elevator-is-visible {
    /* the button becomes visible */
    visibility: visible;
    opacity: 1;
    z-index: 999;
  }
  .fa {
    color: white;
    margin: 0;
    padding: 0;
    position: relative;
    left: 14.5px;
    top: 12.5px;
    font-size: 20px;
    -webkit-transition: all 0.3s ease;
    -moz-transition: all 0.3s ease;
    -ms-transition: all 0.3s ease;
    -o-transition: all 0.3s ease;
    transition: all 0.3s ease;
  }
  &:hover {
    background: fade(black, 80%); // rgba(0, 0, 0, 0.8);
    .fa {
      color: white; // #fff
      top: 5px;
    }
  }
  @media (max-width: 768px) {
    /* only show elevator on desktop screen */
    display: none !important;
  }
}


/**
 * Junk for a demo page
 */
body{background: #eee ;font-family: 'Open Sans', sans-serif;}h3{font-size: 30px; font-weight: 400;text-align: center;margin-top: 50px;}h3 i{color: #444;}
.alert {
   margin: 25px 25% 0 25%;
   &.alert-info {
     @media (max-width: 768px) {
       display: none !important;
     }
   }
   &.alert-warning {
     @media (min-width: 768px) {
       display: none !important;
     }
  } 
}

(function ($) {
  'use strict';

  // Elevator - Scroll back to top utility JS
  // ========================================

  // append necessary class
  // should have already contain wrapper on a page.
  // <div class="elevator-wrapper"></div>
  $('.elevator-wrapper').append('<div class="elevator"><i class="fa fa-chevron-up" aria-hidden="true"></i></div>');

  // browser window scroll (in pixels) after which the "back to top" link is shown
  var offset = 300,
    // duration of the top scrolling animation (in ms)
    scroll_top_duration = 700,
    // grab the "back to top" link
    $back_to_top = $('.elevator');

  // hide or show the "back to top" link
  $(window).scroll(function () {
    ($(this).scrollTop() > offset) ? $back_to_top.addClass('elevator-is-visible') : $back_to_top.removeClass('elevator-is-visible');
  });

  // smooth scroll to top
  $back_to_top.on('click', function (event) {
    event.preventDefault();
    $('body,html').animate({
      scrollTop: 0
      }, scroll_top_duration
    );
  });

})(jQuery);