//Off screen

//
//@variables
//

//General
$off-screen-navigation-color: #EFEFEF !default;
$off-screen-navigation-width: 80% !default;
$off-screen-navigation-font-weight: 100 !default;
$off-screen-navigation-background-color: #333 !default;
$off-screen-z-index: 1 !default;
$off-screen-left-padding: 1rem !default;
$off-screen-vertical-padding: 0.7rem !default;
$off-screen-text-shadow-color: $off-screen-navigation-color !default;
$off-screen-text-shadow-alpha: 0.1 !default;

//Links
$off-screen-font-size: 1.2rem !default;
$off-screen-include-link-hover-transition: true !default;
$off-screen-link-padding: 1rem !default;
$include-separator-to-links: true !default;

//List Header
$off-screen-list-header-transform: uppercase !default;
$off-screen-list-header-font-weight: bold !default;
$off-screen-list-header-font-size: 0.7rem !default;

//Divider
$off-screen-divider-color: lighten($off-screen-navigation-background-color, 10%) !default;
$off-screen-divider-margin: 0.21428571rem !default;

//Back link
$off-screen-back-link-padding: 0.5rem 1rem !default;
$off-screen-back-link-font-weight: 300 !default;
$off-screen-back-link-letter-spacing: 1px !default;
$off-screen-back-link-font-size: 0.9rem !default;
$off-screen-back-link-background: rgba(#000, 0.1) !default;
$off-screen-back-link-text-transform: uppercase !default;
$off-screen-back-link-border-color: #000 !default;
$off-screen-back-link-border-alpha: 0.2 !default;

//Header
$off-screen-header-padding: 1rem !default;
$off-screen-header-font-weight: 200 !default;

$off-screen-toggle-menu-left-position: 0.71428571rem !default;
$off-screen-toggle-menu-brand-name-padding-left: $off-screen-toggle-menu-left-position + 1.42857143rem !default;
$off-screen-toggle-color: #FFF !default;

//Menu toggle
$off-screen-toggle-padding-left: px-to-rems(34) !default;

.off-screen {
  .navigation-bar {
    .brand-section {
      .brand-name {
        a {
          padding-left: $off-screen-toggle-padding-left;
          &:before {
            content: '';
            width: 16px;
            height: 0;
            position: absolute;
            left: $off-screen-toggle-menu-left-position;
            top: $navigation-bar-toggle-icon-top-position;
            @include box-shadow(0 10px 0 1px $off-screen-toggle-color,
                                0 16px 0 1px $off-screen-toggle-color,
                                0 22px 0 1px $off-screen-toggle-color);
            display: none;
          }
        }
      }
    }
  }
}

.off-screen {
  position: relative;
  left: 0;
  @include backface-visibility(hidden);


  .off-screen-navigation {
    position: absolute; /* we can't use fixed here :( */
    top: 0;
    left: 0;
    bottom: 0;
    z-index: $off-screen-z-index;
    width: $off-screen-navigation-width;
    height: 100%;
    min-height: 100%;
    @include transform( translate3d(-100%, 0, 0));
    color: darken($off-screen-navigation-color, 10%);

    a {
      text-decoration: none;
    }

    ul {
      margin: 0;
      padding: 0;
      list-style: none;
      background: $off-screen-navigation-background-color;
      li {

        & > a {
          display: block;
          padding: $off-screen-vertical-padding 0 $off-screen-vertical-padding $off-screen-left-padding;
          outline: none;
          font-size: $off-screen-font-size;
          text-shadow: 0 0 1px rgba($off-screen-text-shadow-color, $off-screen-text-shadow-alpha);
          @if($off-screen-include-link-hover-transition){
            @include transition(background 0.3s, box-shadow 0.3s);
          }
        }

        &.off-screen-list-header {
          text-transform: $off-screen-list-header-transform;
          padding-left: $off-screen-left-padding;
          padding-top:  $off-screen-left-padding;
          padding-bottom:  $off-screen-left-padding / 2;
          font-weight: $off-screen-list-header-font-weight;
          font-size: $off-screen-list-header-font-size;
        }

        &.off-screen-divider {
          border-bottom: 1px solid $off-screen-divider-color;
          margin: $off-screen-divider-margin auto;
        }

        a {
          color: $off-screen-navigation-color; 
          padding: $off-screen-link-padding;
        }
      }
    }

    a {
      font-weight: $off-screen-navigation-font-weight;
      @if($include-separator-to-links) {
        border-bottom: 1px solid rgba($off-screen-navigation-color, 0.1);
      }

      &.navigation-back {
        padding: $off-screen-back-link-padding;
        background: $off-screen-back-link-background;
        outline: none;
        color: $off-screen-navigation-color;
        text-transform: $off-screen-back-link-text-transform;
        letter-spacing: $off-screen-back-link-letter-spacing;
        font-weight: $off-screen-back-link-font-weight;
        display: block;
        font-size: $off-screen-back-link-font-size;
        position: relative;
        @include transition(none);
        border-top: 1px solid rgba($off-screen-back-link-border-color, $off-screen-back-link-border-alpha);
        border-bottom: 1px solid rgba($off-screen-back-link-border-color, $off-screen-back-link-border-alpha);

        &:hover {
          background: rgba($off-screen-back-link-border-color,0.1);
        }
      }

      &:hover {
        color: darken($off-screen-navigation-color, 10%);
        background: rgba($off-screen-navigation-background-color, $off-screen-back-link-border-alpha);
      }
    }
  }

}


.off-screen-level {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	background: $off-screen-navigation-background-color;
  @include translate3d(-100%, 0, 0);

  .off-screen-header {
    padding: $off-screen-header-padding;
    font-weight: $off-screen-header-font-weight;
    text-align: center;

    .header {
      color: $off-screen-navigation-color;
    }
  }
}

/* overlays for pusher and for level that gets covered */
.off-screen::after,
.off-screen-level::after,
.off-screen-level::before {
	position: absolute;
	top: 0;
	right: 0;
	width: 0;
	height: 0;
	content: '';
	@include opacity(0);
}

.off-screen::after,
.off-screen-level::after {
  @include transition(opacity 0.3s, width 0.1s 0.3s, height 0.1s 0.3s);
}

.off-screen-level::after {
	z-index: -1;
}

.off-screen.off-screen-pushed::after,
.off-screen-level.off-screen-level-overlay::after {
	width: 100%;
	height: 100%;
	@include opacity(1);
  @include transition(opacity 0.3s);
}

.off-screen,
.off-screen-level {
  @include transition(all 0.5s);
}

/* overlap */
.off-screen-overlap .off-screen-level.off-screen-level-open {
  @include translate3d(-40px, 0, 0);
}

/* First level */
.off-screen-navigation > .off-screen-level,
.off-screnn-navigation > .off-screen-level.off-screen-level-open,
.off-screen-navigation.off-screen-overlap > .off-screen-level,
.off-screen-navigation.off-screen-overlap > .off-screen-level.off-screen-level-open {
  @include translate3d(0, 0, 0);
	@include box-shadow(none);
}

/* cover */
.off-screen-cover .off-screen-level.off-screen-level-open {
  @include translate3d(0, 0, 0);
}

.off-screen-cover .off-screen-level.off-screen-level-open > ul > li > .off-screen-level:not(.off-screen-level-open) {
  @include translate3d(-100%, 0, 0);
}

/* Fallback example for browsers that don't support 3D transforms (and no JS fallback) */
/* We'll show the first level only */
.no-csstransforms3d .off-screen,
.no-js .off-screen {
	padding-left: 300px;
}

.no-csstransforms3d .off-screen-navigation .off-screen-level,
.no-js .off-screen-navigation .off-screen-level {
	display: none;
}

.no-csstransforms3d .off-screen-navigation > .off-screen-level,
.no-js .off-screen-navigation > .off-screen-level {
	display: block;
}