$gallerybox-screen-sm-width: 768px !default;
$gallerybox-screen-sm-height: 600px !default;


html.gallerybox-open {
  overflow: hidden;
  position: fixed;
  width: 100%;
}

.gallerybox,
.gallerybox-overlay,
.gallerybox-images,
.gallerybox-image {
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
}

.gallerybox-overlay,
.gallerybox-images,
.gallerybox-image,
.gallerybox-image-inner {
  position: absolute;
}

.gallerybox {
  display: none;
  position: fixed;
  overflow: hidden;
  z-index: 10000;

  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;

  &.open {
    display: block;
  }
}

.gallerybox-overlay {
  background: #000;

  @media (min-width: $gallerybox-screen-sm-width) {
    background: rgba(#000, 0.8);
  }

  opacity: 0;

  -webkit-transition: opacity 0.2s;
  transition: opacity 0.2s;
}

.opening .gallerybox-overlay {
  opacity: 1;
}

.gallerybox-images {
  @media (min-height: $gallerybox-screen-sm-height) {
    top: 40px;
    bottom: 40px;
  }
}

.opened .gallerybox-image {
  -webkit-transition: -webkit-transform 0.6s, transform 0.6s;
  transition: -webkit-transform 0.6s,
              transform 0.6s;
}

.panning {
  .gallerybox-overlay,
  .gallerybox-sep,
  .gallerybox-image {
    -webkit-transition: none;
    transition: none;
  }
}

.init .gallerybox-image {
  visibility: hidden;
  -webkit-transition: none;
  transition: none;
}

.gallerybox-image {
  text-align: center;
  display: none;

  -webkit-transition: -webkit-transform 0.3s, transform 0.3s;
  transition: -webkit-transform 0.3s,
              transform 0.3s;

  &.active, &.prev, &.next {
    display: block;
  }

  &.active {
    z-index: 1;

    -webkit-transform: translateX(0);
    transform: translateX(0);
  }

  &.prev {
    -webkit-transform: translateX(-100%);
    transform: translateX(-100%);
  }

  &.next {
    -webkit-transform: translateX(100%);
    transform: translateX(100%);
  }
}

.gallerybox-image-inner {
  top: 0;
  left: 0;
  right: 0;
  height: 100%;

  @media (min-width: $gallerybox-screen-sm-width) {
    left: 65px;
    right: 65px;
  }
}

.gallerybox-img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;

  position: relative;
  top: 50%;
  margin: 0 auto;

  -webkit-transform: translateY(-50%);
  transform: translateY(-50%);
}

@media (min-width: $gallerybox-screen-sm-width) {
  .opened .gallerybox-img {
    -webkit-box-shadow: 0 2px 20px #000;
            box-shadow: 0 2px 20px #000;
  }
}

@media (max-width: $gallerybox-screen-sm-width - 1) {
  .gallerybox-sep {
    display: none;
    position: absolute;
    width: 10%;
    height: 100%;
    background: #000;

    -webkit-transition: -webkit-transform 0.5s, transform 0.5s;
    transition: -webkit-transform 0.5s,
                transform 0.5s;
  }

  .gallerybox-sep-left {
    left: 0;
  }

  .gallerybox-sep-right {
    right: 0;
  }

  .opened .gallerybox-sep {
    display: block;
  }

  .pan-vertical .gallerybox-sep {
    display: none !important;
  }

  .active {
    .gallerybox-sep-left {
      -webkit-transform: translateX(-100%);
      transform: translateX(-100%);
    }

    .gallerybox-sep-right {
      -webkit-transform: translateX(100%);
      transform: translateX(100%);
    }
  }
}

.gallerybox-control {
  -ms-touch-action: manipulation;
      touch-action: manipulation;
  cursor: pointer;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
  border: 0;
  outline: none;
  padding: 12px;
  line-height: 1;

  z-index: 2;

  -webkit-transition: opacity 0.2s;
  transition: opacity 0.2s;

  opacity: 0;

  &, &:hover, &:active, &:focus {
    color: #fff;
  }
}

.opening .gallerybox-control {
  opacity: 0.5;

  @media (min-width: $gallerybox-screen-sm-width) {
    &:hover {
      opacity: 1;
    }
  }
}

.gallerybox-close {
  position: absolute;
  top: 0;
  right: 0;
}

.gallerybox-prev,
.gallerybox-next {
  position: absolute;
  top: 50%;
  margin-top: -32px;
}

.gallerybox-prev {
  left: 0;
}

.gallerybox-next {
  right: 0;
}

.hide-controls {
  @media (max-width: ($gallerybox-screen-sm-width - 1)) {
    .gallerybox-prev,
    .gallerybox-next {
      opacity: 0;
      pointer-events: none;
    }
  }

  @media (max-height: ($gallerybox-screen-sm-height - 1)) {
    .gallerybox-close {
      opacity: 0;
      pointer-events: none;
    }
  }
}