@mixin box($margin-top) {
  visibility: hidden;
  margin-top: $margin-top;
  position: absolute;
  padding: 15px;
}

.hint {
  position: absolute;
  top: -1000em;
  left: -1000em;
  line-height: 0;
  height: 0;
  font-size: 0;
  color: transparent;
  border: 0 none;
}

.navigation {
  @include unselectable;
  width: 85px;
  position: absolute;
  right: 0;
  top: 0;
  z-index: 3;

  img {
    border: none;
  }

  a.navigation_main, a.navigation_top, a.navigation_index {
    display: none;
  }

  @include phone {
    display: none;
  }

  .navigation_bar_bottom {
    display: none;
  }

  ul {
    margin: 0;
    padding: 0;
  }

  .scroller:after {
    content: " ";
    display: block;
    height: 150px;
    @include background-image(linear-gradient(rgba(53, 53, 53, 1) 0, transparent 100%));
  }

  li {
    list-style-type: none;

    &[tabindex] {
      outline: -webkit-focus-ring-color none 0;
    }

    &.filtered {
      display: none;
    }

    &.animate_in {
      &.moving_forwards {
        @include animation(pageflow-navigation-bar-slide-in-from-bottom 0.4s ease-out);
      }

      &.moving_backwards {
        @include animation(pageflow-navigation-bar-slide-in-from-top 0.4s ease-out);
      }

      &.moving_down {
        @include animation(pageflow-navigation-bar-slide-in-from-right 0.4s ease-out);
      }

      &.moving_up {
        @include animation(pageflow-navigation-bar-slide-in-from-left 0.4s ease-out);
      }
    }

    &.animate_out {
      opacity: 0;

      &.moving_forwards {
        @include animation(pageflow-navigation-bar-slide-out-to-top 0.4s ease-in);
      }

      &.moving_backwards {
        @include animation(pageflow-navigation-bar-slide-out-to-bottom 0.4s ease-in);
      }

      &.moving_down {
        @include animation(pageflow-navigation-bar-slide-out-to-left 0.4s ease-in);
        @include transform(translate3d(-100%, 0, 0));
      }

      &.moving_up {
        @include animation(pageflow-navigation-bar-slide-out-to-right 0.4s ease-in);
        @include transform(translate3d(100%, 0, 0));
      }
    }
  }

  a {
    display: block;

    span {
      display: block;

      &.hidden {
        display: inline;
      }
    }

    &:active {
      outline: none;
    }
  }

  a {
    @include hover {
      + div {
        visibility: visible;
      }
    }
  }

  a:focus + div, .navigation_menu.focused div {
    visibility: visible;
  }

  .navigation_thumbnails a {
    position: relative;
    outline: none;

    &:focus:before {
      content: " ";
      position: absolute;
      top: 0;
      right: 0;
      bottom: 0;
      left: 0;
      border: solid 3px #eee;

      .disable_focus_rect & {
        display: none;
      }
    }
  }

  .navigation_thumbnails li {
    overflow: hidden;
  }

  .navigation_site_detail {
    @include box(-40px);

    img {
      margin-top: 12px;
    }
  }

  .navigation_bg, .navigation_bullet .button {
    margin: auto;
  }

  .navigation_menu_box {
    @include box(0);

    p {
      margin: 0 0 0.5em;
    }
  }

  .navigation_share_box {
    .sub_share {
      display: none;
    }
  }

  .navigation_credits_box {
    min-width: 230px;
    min-height: 4px;

    a.legal, a.copy {
      float: left;
    }
  }

  .navigation_menu {
    @include hover {
      .navigation_menu_box {
        visibility: visible;
      }
    }

    &:focus, &.open {
      .navigation_menu_box {
        visibility: visible;
      }
    }
  }

  &.js {
    position: absolute;
    bottom: 0;

    & > * {
      position: absolute;
      width: 100%;
    }

    & > .navigation_site_detail {
      margin-top: 0;
      width: auto;
    }

    a.navigation_scroll_indicator {
      opacity: 0;
      visibility: hidden;
      @include transition(opacity 0.2s linear, visibility 0.2s);

      &.visible {
        opacity: 1;
        visibility: visible;
      }

      &.bottom {
        z-index: 1;
      }
    }

    .navigation_bar_top {
      a.navigation_main, a.navigation_top, a.navigation_index {
        display: block;
      }
    }

    &.is_animating .scroller:after {
      position: absolute;
      top: 0;
    }

    .scroller {
      overflow: hidden;

      &:after {
        height: 100%;
        width: 100%;
        z-index: 1;
        background-image: none;
      }

      ul {
        position: relative;
        z-index: 2;

        a {
          position: relative;
          padding-bottom: 4px;

          &.active {
            cursor: default;
          }
        }

        img {
          display: block;
        }
      }
    }

    .navigation_bar_bottom {
      display: block;

      .indicator {
        height: 50px;
      }

      .fullscreen {
        height: 44px;
      }
    }

    .navigation_share_box {
      bottom: 48px;
    }

    .navigation_credits_box {
      bottom: 4px;
    }

    .visible {
      visibility: visible;
    }

    .hidden {
      visibility: hidden;
    }

    .volume-control {
      margin: 0 20px;

      .volume-slider {
        width: 100px;
        height: 4px;
      }

      .volume-level {
        height: 100%;
      }
    }
  }
}