@function gtkalpha($c,$a) {
  @return unquote("alpha(#{$c},#{$a})");
}

$ease-out-quad: cubic-bezier(0.25, 0.46, 0.45, 0.94);

* {
  background-clip: padding-box;
  -GtkToolButton-icon-spacing: 4;
  -GtkTextView-error-underline-color: $error_color;
  -GtkPaned-handle-size: 1;

  -GtkCheckButton-indicator-size: 16;
  -GtkCheckMenuItem-indicator-size: 16;

  // The size for scrollbars. The slider is 2px smaller, but we keep it
  // up so that the whole area is sensitive to button presses for the
  // slider. The stepper button is larger in both directions, the slider
  // only in the width

  -GtkScrolledWindow-scrollbar-spacing: 0;
  -GtkScrolledWindow-scrollbars-within-bevel: 1;

  -GtkToolItemGroup-expander-size: 11;
  -GtkExpander-expander-size: 16;
  -GtkTreeView-expander-size: 11;

  -GtkTreeView-horizontal-separator: 4;

  -GtkMenu-horizontal-padding: 0;
  -GtkMenu-vertical-padding: 0;

  -GtkWidget-link-color: $link_color;
  -GtkWidget-visited-link-color: $link_visited_color;

  -GtkWidget-focus-padding: 2;    // FIXME: do we still need these?
  -GtkWidget-focus-line-width: 1; //

  -GtkWidget-text-handle-width: 20;
  -GtkWidget-text-handle-height: 20;

  -GtkDialog-button-spacing: 4;
  -GtkDialog-action-area-border: 0;

  -GtkStatusbar-shadow-type: none;

  // We use the outline properties to signal the focus properties
  // to the adwaita engine: using real CSS properties is faster,
  // and we don't use any outlines for now.

  outline-color: transparentize($fg_color, 0.7);
  outline-style: dashed;
  outline-offset: -3px;
  outline-width: 1px;
  outline-radius: 2px;
}


/***************
 * Base States *
 ***************/

.background {
  color: $fg_color;
  background-color: transparentize($bg_color, 0.001); // without this headerbar transparency doesn't seem to work
}

/*
   These wildcard seems unavoidable, need to investigate.
   Wildcards are bad and troublesome, use them with care,
   or better, just don't.
   Everytime a wildcard is used a kitten dies, painfully.
*/

*:insensitive {
  -gtk-image-effect: dim;
}

.gtkstyle-fallback {
  background-color: $bg_color;
  color: $fg_color;
  &:prelight {
    background-color: lighten($bg_color, 10%);
    color: $fg_color;
  }
  &:active {
    background-color: darken($bg_color, 10%);
    color: $fg_color;
  }
  &:insensitive {
    background-color: $insensitive_bg_color;
    color: $insensitive_fg_color;
  }
  &:selected {
    background-color: $selected_bg_color;
    color: $selected_fg_color;
  }
}

.view {
  color: $text_color;
  background-color: $base_color;

  &:selected,
  &:selected:focus,
  &:selected:hover {
    @extend %selected_items;
  }
  &.dim-label { 
    color: transparentize($text_color, 0.45);

    &:selected, &:selected:focus {
      color: transparentize($selected_fg_color, 0.35);
      text-shadow: none;
    }
  }
}

.rubberband {
  border: 1px solid $selected_bg_color;
  background-color: transparentize($selected_bg_color,0.8);
}

.label {
  &.separator {
    color: $fg_color;
    @extend .dim-label;
  }
  &:selected,
  &:selected:focus,
  &:selected:hover {
    @extend %selected_items;
  }
  &:insensitive {
    color: $insensitive_fg_color;
  }
}

.dim-label {
  opacity: 0.55;
}

GtkAssistant {
  .sidebar {
    background-color: $base_color;
    border-top: 1px solid $borders_color;
    &:dir(ltr) { border-right: 1px solid $borders_color; }
    &:dir(rtl) { border-left: 1px solid $borders_color; }
  }
  &.csd .sidebar { border-top-style: none; }
  .sidebar .label {
    padding: 6px 12px;
  }
  .sidebar .label.highlight {
    background-color: $selected_bg_color;
    color: $selected_fg_color;
  }
}

GtkTextView { // This will get overridden by .view, needed by gedit line numbers
  background-color: mix($bg_color, $base_color, 50%);
}

.grid-child {
  padding: 3px;
  border-radius: 3px;
  &:selected {
    @extend %selected_items;
    outline-offset: -2px;
  }
}

%osd, .osd {
  color: $osd_fg_color;
  border: none;
  background-color: $osd_bg_color;
  background-clip: padding-box;
  outline-color: transparentize($osd_fg_color, 0.7);
  box-shadow: none;
}

/**********************
 * Spinner Animations *
 **********************/

@keyframes spin {
  to { -gtk-icon-transform: rotate(1turn); }
}

.spinner {
  background-image: none;
  background-color: blue;
  opacity: 0; // non spinning spinner makes no sense
  -gtk-icon-source: -gtk-icontheme('process-working-symbolic');

  &:active {
    opacity: 1;
    animation: spin 1s linear infinite;

    &:insensitive {
      opacity: 0.5;
    }
  }
}

/****************
 * Text Entries *
 ****************/

.entry {
  border: 1px solid;
  padding: 5px 8px 6px;

  border-radius: 15px;
  transition: all 200ms $ease-out-quad;
  @include entry(normal);

  .header-bar & { padding: 6px 11px; }

  //&.image { // icons inside the entry
  //  &.left { padding-left: 0; }
  //  &.right { padding-right: 0; }
  //}
  &.image { padding-left: 3px; padding-right: 3px; }

  &.flat, &.flat:focus {
    padding: 2px;
    @include entry(normal);
    border: none;
    border-radius: 0;
  }

  &:focus { @include entry(focus); }

  &:insensitive { @include entry(insensitive); }

  &:selected,
  &:selected:focus {
    background-color: $selected_bg_color;
    color: $selected_fg_color;
  }

  &.progressbar {
    margin: 2px;
    border-radius: 0;
    border-width: 0 0 2px;
    border-color: $selected_bg_color;
    border-style: solid;
    background-image: none;
    background-color: transparent;
    box-shadow: none;
  }

  .linked > & { //FIXME: use same buttons linking logic and template
    &:first-child {
      border-top-right-radius: 0;
      border-bottom-right-radius: 0;
      &:dir(rtl) { border-right-style: none;}
    }
    &:last-child {
      border-top-left-radius: 0;
      border-bottom-left-radius: 0;
      border-left-style: none;
      &:dir(rtl) { border-left-style: solid; }
    }
  }

  &.error {
    color: white;
    border-color: $error_color;
    background-image: linear-gradient(to bottom, mix($error_color, $base_color, 80%));
    &:focus {
      background-image: linear-gradient(to bottom, $error_color);
      color: white;
    }
    &:selected, &:selected:focus {
      background-color: white;
      color: $error_color;
    }
  }

  &.warning {
    color: white;
    border-color: $warning_color;
    background-image: linear-gradient(to bottom, mix($warning_color, $base_color, 80%));
    &:focus {
      background-image: linear-gradient(to bottom, $warning_color);
      color: white;
    }
    &:selected, &:selected:focus {
      background-color: white;
      color: $warning_color;
    }
  }

  &.image { // entry icons colors
    color: mix($fg_color,$base_color,80%);
    &:hover { color: $fg_color; }
    &:active { color: $selected_bg_color; }
  }

  .linked.vertical > & { //FIXME comment stuff and make the whole thing smarter.
    border-bottom-color: mix($borders_color, $base_color, 30%);
    box-shadow: none;
    @extend %linked_vertical;

    &:focus {
      border-color: $selected_bg_color;
      box-shadow: 0 -1px 0 0 $selected_bg_color;
      @extend %linked_vertical;
    }

    &:insensitive {
      border-bottom-color: mix($borders_color, $base_color, 30%);
      @extend %linked_vertical;
    }

    &:first-child {
      border-bottom-color: mix($borders_color, $base_color, 30%);

      &:focus {
        border-bottom-color: $selected_bg_color;
        box-shadow: none;
      }

      &:insensitive {
        border-bottom-color: mix($borders_color, $base_color, 30%);
        @extend %linked_vertical:first-child;
      }
    }

    &:last-child {
      border-bottom-color: rgba(0,0,0,0.14);
      &:focus {
        border-bottom-color: $selected_bg_color;
        box-shadow: 0 -1px 0 0 $selected_bg_color;
        @extend %linked_vertical:last-child;
      }

      &:insensitive {
        border-bottom-color: rgba(0,0,0,0.14);
        @extend %linked_vertical:last-child;

      }
    }
  }

//  .osd & {
//    @include entry(osd);
//    &:focus { @include entry(osd-focus); }
//    &:insensitive { @include entry(osd-insensitive); }
//  }
}

/***********
 * Buttons *
 ***********/

// stuff for .needs-attention
$_dot_color: $selected_bg_color;

@keyframes needs_attention {
  from {
    background-image: -gtk-gradient(radial,
                                    center center, 0,
                                    center center, 0.01,
                                    to($_dot_color),
                                    to(transparent));
  }
  to {
    background-image: -gtk-gradient(radial,
                                    center center, 0,
                                    center center, 0.5,
                                    to($selected_bg_color),
                                    to(transparent));
  }
}


.button {
  $_button_transition: all 200ms $ease-out-quad;

  transition: $_button_transition;
  border: 1px solid;
  border-radius: 3px;
  padding: 5px 8px;

  .header-bar & { padding: 6px 11px; }

  @include button(normal);

  &.flat { 
    @include button(undecorated);
    background-color: transparentize($bg_color, 1);
    // to avoid adiacent buttons borders clashing when transitioning, the transition on the normal state is set
    // to none, while it's added back in the hover state, so the button decoration will fade in on hover, but
    // it won't fade out when the pointer leave the button allocation area. To make the transition more evident
    // in this case the duration is increased.
    transition: none;
    &:hover {
      transition: $_button_transition;
      transition-duration: 350ms;
      &:active { transition: $_button_transition; }
    }
  }
  &:hover {
    @include button(hover);
    -gtk-image-effect: highlight;
  }
  &:active, &:checked {
    @include button(active);
    transition-duration: 50ms;
  }
  &.flat:insensitive {
    @include button(undecorated);
  }
  &:insensitive {
    @include button(insensitive);
    &:active, &:checked {
      @include button(insensitive-active);
    }
  }
  // big standalone buttons like in Documents pager
  &.osd {
    outline-color: transparentize($osd_fg_color, 0.7);

    @include button(osd);
    background-color: $osd_bg_color;

    &.image-button { padding: 10px; }

    &:hover { @include button(osd-hover); border-color: transparentize($osd_fg_color, 0.7)}
    &:active, &:checked { @include button(osd-active); }
    &:insensitive { @include button(osd-insensitive); }
  }

  //overlay / OSD style
  .osd & {
    @include button(osd);
    // there's a problem with sass which prevents it to extend the linked
    // placeholder as expected, it should just be "@extend %linked;", the
    // placeholder is basically replicated here
    //
    // Workaround START
    border-radius: 0;
    border-left-style: none;
    border-right-style: none;

    &:dir(rtl) {
      border-radius: 0;
      border-right-style: none;
      border-left-style: none
    }
    &:first-child {
      border-radius: 3px 0 0 3px;
      border-left-style: solid;
    }
    &:last-child {
      border-radius: 0 3px 3px 0;
      border-right-style: solid;

      &:dir(rtl) { border-left-style: solid; }
    }
    &:only-child {
      border-radius: 3px;
      border-style: solid;
    }
    // Workaround END
    &:hover {
      @include button(osd-hover);
      @extend %linked;
    }
    &:active, &:checked {
      @include button(osd-active);
      @extend %linked;
    }
    &:insensitive {
      @include button(osd-insensitive);
      @extend %linked;
    }

    &.flat {
      @include button(undecorated);
      box-shadow: none;
      &:hover {
        @include button(osd-hover);
      }
      &:insensitive {
        @include button(osd-insensitive);
        background-image: none;
      }
      &:active, &:checked {
        @include button(osd-active);
      }
    }
  }
  // Suggested and Destructive Action buttons
  @each $b_type, $b_color in (suggested-action, $suggested_color),
                             (destructive-action, $destructive_color) {
    &.#{$b_type} {
      color: $selected_fg_color;
      border-color: $b_color;
      background-color: $b_color;

      &.flat {
        @include button(undecorated);
        color: $b_color;
      }
      &:hover {
        color: $selected_fg_color;
        border-color: lighten($b_color, 9%);
        background-color: lighten($b_color, 9%);
      }
      &:active, &:checked {
        color: $selected_fg_color;
        border-color: darken($b_color, 7%);
        background-color: darken($b_color, 7%);
      }
      &.flat:insensitive {

      }
      &:insensitive {
        color: transparentize($selected_fg_color, 0.4);
        border-color: transparentize($b_color, 0.35);
        background-color: transparentize($b_color, 0.35);

        &:active, &:checked {

        }
      }
    }
  }

  &.image-button { padding: 8px; }

  .header-bar &.image-button { padding: 6px 9px; }

  &.text-button {
    padding-left: 16px;
    padding-right: 16px;
  }

  .header-bar &.text-button { padding: 6px 16px; }

  &.text-button.image-button {
    // those buttons needs uneven horizontal padding, we want the icon side
    // to have the image-button padding, while the text side the text-button
    // one, so we're adding the missing padding to the label depending on
    // its position inside the button
    padding: 4px 8px 5px; // same as .button
    GtkLabel:first-child { padding-left: 8px; }
    GtkLabel:last-child { padding-right: 8px; }
  }

  .header-bar &.text-button.image-button { padding: 6px 16px; }

  .stack-switcher > & {
    // to position the needs attention dot, padding is added to the button
    // child, a label needs just lateral padding while an icon needs vertical
    // padding added too.

    outline-offset: -3px; // needs to be set or it gets overridden by GtkRadioButton outline-offset

    > GtkLabel {
      padding-left: 6px;  // label padding
      padding-right: 6px; //
    }
    > GtkImage {
      padding-left: 6px;
      padding-right: 6px;
      padding-top: 5px;
      padding-bottom: 5px;
    }

    .header-bar > GtkLabel { padding: 6px 10px; }

    &.text-button { padding: 5px 10px; }

    .header-bar &.text-button { padding: 6px 10px; }

    &.image-button { padding: 1px 3px; }

    &.needs-attention > .label,
    &.needs-attention > GtkImage { @extend %needs_attention; }
    &.needs-attention:active > .label,
    &.needs-attention:active > GtkImage,
    &.needs-attention:checked > .label,
    &.needs-attention:checked > GtkImage {
      animation: none;
      background-image: none;
    }
  }

  %needs_attention {
    animation: needs_attention 150ms ease-in;
    background-image: -gtk-gradient(radial,
                                    center center, 0,
                                    center center, 0.5,
                                    to($_dot_color),
                                    to(transparent));
    background-size: 6px 6px, 6px 6px;
    background-repeat: no-repeat;
    background-position: right 3px, right 4px;

    &:dir(rtl) {
      background-position: left 3px, left 4px;
    }
  }

  //inline-toolbar buttons
  .inline-toolbar &, .inline-toolbar &:backdrop {
    border-radius: 2px;
    border-width: 1px;
    @extend %linked;
  }

  .linked > &,
  .linked > &:hover,
  .linked > &:active,
  .linked > &:checked { @extend %linked; }

  .linked.vertical > &,
  .linked.vertical > &:hover,
  .linked.vertical > &:active,
  .linked.vertical > &:checked { @extend %linked_vertical; }
}

// all the following is for the +|- buttons on inline toolbars, that way
// should really be deprecated...
.inline-toolbar GtkToolButton > .button { // redefining the button look is
                                          // needed since those are flat...
  @include button(normal);
  &:hover { @include button(hover); }
  &:active,
  &:checked{ @include button(active); }
  &:insensitive { @include button(insensitive); }
  &:insensitive:active,
  &:insensitive:checked { @include button(insensitive-active); }
}

// More inline toolbar buttons
.inline-toolbar.toolbar GtkToolButton {
  & > .button.flat { @extend %linked_middle; }
  &:dir(rtl) > .button.flat { @extend %linked_middle:dir(rtl); }
  &:first-child > .button.flat { @extend %linked:first-child; }
  &:last-child > .button.flat { @extend %linked:last-child; }
  &:last-child:dir(rtl) > .button.flat { @extend %linked:last-child:dir(rtl); }
  &:only-child > .button.flat { @extend %linked:only-child; }
}

%linked_middle {
  border-radius: 0;
  border-left-style: none;
  border-right-style: none;

  &:hover {
    box-shadow: inset 1px 0 $selected_bg_color, inset -1px 0 $selected_bg_color;
  }

  &:dir(rtl) {
    border-radius: 0; // needed when including %linked_middle:dir(rtl)
  }
}

%linked {
  @extend %linked_middle;

  &:first-child {
    border-radius: 3px 0 0 3px;
    border-left-style: solid;

    &:hover { box-shadow: inset -1px 0 $selected_bg_color; }
  }
  &:last-child {
    border-radius: 0 3px 3px 0;
    border-right-style: solid;

    &:hover { box-shadow: inset 1px 0 $selected_bg_color; }

    &:dir(rtl) { border-bottom-left-radius: 0; }

  }
  &:only-child {
    border-radius: 3px;
    border-style: solid;

    &:hover { box-shadow: none; }
  }
}

%linked_vertical_middle {
  border-style: solid;
  border-bottom-style: none;
  border-top-style: none;
  border-radius: 0;

  &:hover { box-shadow: inset 0 1px $selected_bg_color, inset 0 -1px $selected_bg_color; }
}

%linked_vertical{
  @extend %linked_vertical_middle;

  &:first-child {
    border-radius: 3px 3px 0 0;
    border-top-style: solid;

    &:hover { box-shadow: inset 0 -1px $selected_bg_color; }
  }
  &:last-child {
    border-radius: 0 0 3px 3px;
    border-bottom-style: solid;

    &:hover { box-shadow: inset 0 1px $selected_bg_color; }
  }
  &:only-child {
    border-radius: 3px;
    border-style: solid;

    &:hover { box-shadow: none; }
  }
}

%undecorated_button {
  border-color: transparent;
  background-color: transparent;
  background-image: none;
  box-shadow: none;
}

/* menu buttons */
.menuitem.button.flat {
  transition: none;
  @extend %undecorated_button;
  outline-offset: -1px;
  border-radius: 2px;

  &:hover { background-color: mix($fg_color,$bg_color,5%); }
  &:selected, &:checked, &:active {
    @extend %selected_items;
  }
}

/*********
 * Links *
 *********/

*:link {
  color: $link_color;
  &:visited {
    color: $link_visited_color;
    *:selected & { color: mix($selected_fg_color, $selected_bg_color, 60%); }
  }
  &:hover {
    color: lighten($link_color,10%);
    *:selected & { color: mix($selected_fg_color, $selected_bg_color, 90%); }
  }
  &:active {
    color: $link_color;
    *:selected & { color: mix($selected_fg_color, $selected_bg_color, 80%); }
  }
  &:selected, *:selected & {
    color: mix($selected_fg_color, $selected_bg_color, 80%);
  }
}

.button:link, .button:visited {
  @extend %undecorated_button;
  @extend *:link;
  &:hover, &:active, &:checked {
    @extend %undecorated_button;
  }
}

/*****************
 * GtkSpinButton *
 *****************/

.spinbutton {
  border-radius: 3px;

  .button {
    background-image: none;
    border: 1px solid transparentize($borders_color,0.4);
    border-style: none none none solid;
    color: mix($fg_color,$base_color,95%);
    border-radius: 0;
    box-shadow: none;
  //  padding-left: 6px;
  //  padding-right: 6px;
    &:dir(rtl) { border-style: none solid none none; }
    &:first-child { color: red; }
    &:hover {
      color: $selected_bg_color;
    }
    &:insensitive {
      color: $insensitive_fg_color;
    }
    &:active {
      background-color: $selected_bg_color;
      color: $selected_fg_color;
    }
  }

//  .osd & {
//    .button {
//      @include button(undecorated);
//      color: $osd_fg_color;
//      border-style: none none none solid;
//      border-color: transparentize($osd_borders_color, 0.3);
//      border-radius: 0;
//      box-shadow: none;
//      &:dir(rtl) { border-style: none solid none none; }
//      &:hover {
//        @include button(undecorated);
//        color: $osd_fg_color;
//        border-color: transparentize(opacify($osd_borders_color, 1), 0.5);
//        background-color: transparentize($osd_fg_color, 0.9);
//        box-shadow: none;
//      }
//      &:insensitive {
//        @include button(undecorated);
//        color: $osd_insensitive_fg_color;
//        border-color: transparentize(opacify($osd_borders_color, 1), 0.5);
//        box-shadow: none;
//      }
//      &:last-child { border-radius: 0 2px 2px 0; }
//      &:dir(rtl):first-child { border-radius: 2px 0 0 2px; }
//    }
//  }

  &.vertical, &.vertical:dir(rtl) {
    .button {
      &:first-child {
        @extend %top_button;
        @include button(normal);
        &:active {
          @extend %top_button;
          @include button(active);
        }
        &:hover {
          @extend %top_button;
          @include button(hover);
        }
        &:insensitive {
          @extend %top_button;
          @include button(insensitive);
        }
      }
      &:last-child {
        @extend %bottom_button;
        @include button(normal);
        &:active {
          @extend %bottom_button;
          @include button(active);
        }
        &:hover {
          @extend %bottom_button;
          @include button(hover);
        }
        &:insensitive {
          @extend %bottom_button;
          @include button(insensitive);
        }
      }
    }
    &.entry {
      // we should remove the bottom edge hilight here, but seems
      // like buttons are on top of it so it doesn't show up
      border-radius: 0;
      padding-left: 5px;
      padding-right: 5px;
    }
    %top_button {
      border-radius: 2px 2px 0 0;
      border-style: solid solid none solid;
    }
    %bottom_button {
      border-radius: 0 0 2px 2px;
      border-style: none solid solid solid;
    }
  }
  GtkTreeView & {
    &.entry, &.entry:focus {
      padding: 1px;
      border-width: 1px 0;
      border-color: $selected_bg_color;
      border-radius: 0;
      box-shadow: none;
    }
  }
}

/**************
 * ComboBoxes *
 **************/
GtkComboBox {
  > .button { padding-top: 3px; padding-bottom: 4px; } // Otherwise combos
                                                       // are bigger then
                                                       // buttons
  -GtkComboBox-arrow-scaling: 0.5;
  -GtkComboBox-shadow-type: none;

  &:insensitive {
    color: $insensitive_fg_color;
  }

  .separator.vertical {
    // always disable separators
    -GtkWidget-wide-separators: true;
  }

  &.combobox-entry .entry {
    @extend %linked;

    border-right-style: none;
    &:dir(rtl) { border-left-style: none; }
  }

  &.combobox-entry .button {
    @extend %linked;

    color: transparentize($fg_color, 0.4);
    background-color: $button_border;
    border-color: $button_border;

    &:hover {
      background-color: lighten($button_border, 5%);
      border-color: $selected_bg_color;
      box-shadow: -1px 0 $selected_bg_color;
    }

    &:active, &:checked { @include button(active); }

    &:insensitive { opacity: 0.5 }
  }
}

.linked > GtkComboBox > .button {
  // the combo is a composite widget so the way we do button linking doesn't
  // work, special case needed. See
  // https://bugzilla.gnome.org/show_bug.cgi?id=733979
  &:dir(ltr) { @extend %linked_middle; } // specificity bump
  &:dir(rtl) { @extend %linked_middle:dir(rtl); }
}
.linked > GtkComboBox:first-child > .button {
  @extend %linked:first-child;
}
.linked > GtkComboBox:last-child > .button {
  @extend %linked:last-child;
}
.linked > GtkComboBox:only-child > .button {
  @extend %linked:only-child;
}
.linked.vertical > GtkComboBoxText > .button,
.linked.vertical > GtkComboBox > .button { @extend %linked_vertical_middle; }
.linked.vertical > GtkComboBoxText:first-child > .button,
.linked.vertical > GtkComboBox:first-child > .button { @extend %linked_vertical:first-child; }
.linked.vertical > GtkComboBoxText:last-child > .button,
.linked.vertical > GtkComboBox:last-child > .button { @extend %linked_vertical:last-child; }
.linked.vertical > GtkComboBoxText:only-child > .button,
.linked.vertical > GtkComboBox:only-child > .button { @extend %linked_vertical:only-child; }

/************
 * Toolbars *
 ************/
.toolbar {
  -GtkWidget-window-dragging: true;
  padding: 4px;
  background-color: $bg_color;
  .osd &, &.osd {
    padding: 7px;
    border: none;
    border-radius: 4px;
    background-color: $osd_bg_color;
  }
}

.primary-toolbar {
  color: $header_fg;
  background-color: opacify($header_bg, 1);
  box-shadow: none;
  border-width: 0 0 1px 0;
  border-style: solid;
  border-image: linear-gradient(to bottom, opacify($header_bg, 1),
                                           darken($header_bg, 7%)) 1 0 1 0; //temporary hack for rhythmbox 3.1

  &:backdrop { background-color: lighten(opacify($header_bg, 1), 3%); }

  .separator { @extend %header_separator; }

  @extend %header_widgets;
}

.inline-toolbar {
  @extend .toolbar;
  background-color: darken($bg_color, 3%);
  border-style: solid;
  border-color: $borders_color;
  border-width: 0 1px 1px;
  padding: 3px;
  border-radius: 0  0 3px 3px;
}

.search-bar {
  background-color: $bg_color;
  border-style: solid;
  border-color: $borders_color;
  border-width: 0 0 1px;
  padding: 3px;
  //box-shadow: inset 0 1px 2px rgba(0,0,0,0.25);
}

.action-bar { background-color: darken($bg_color, 3%) }

/***************
 * Header bars *
 ***************/

.header-bar {
  padding: 7px 7px 6px 7px;

  border-width: 0 0 1px;
  border-style: solid;
  border-radius: 0;
  border-color: darken($header_bg, 7%);

  color: $header_fg;
  background-color: $header_bg;

  &:backdrop {
    color: transparentize($header_fg, 0.3);
    background-color: lighten($header_bg, 3%);
  }

  .title {
    font-weight: bold;
    padding: 0px 12px;
  }

  .subtitle {
    font-size: smaller;
    padding: 0 12px;
    @extend .dim-label;
  }

  // Selectionmode
  &.selection-mode {
    color: $selected_fg_color;
    background-color: $selection_mode_bg;
    border-color: darken($selection_mode_bg, 4%);
    box-shadow: none;

    &:backdrop {
      background-color: $selection_mode_bg;
      color: transparentize($selected_fg_color, 0.4);
    }

    .subtitle:link { @extend *:link:selected;  }

    .button {
      color: $selected_fg_color;
      outline-color: transparentize($selected_fg_color, 0.7);
      background-color: transparentize($selected_fg_color, 1);
      border-color: transparentize($selected_fg_color, 1);

      &.flat {
        @include button(undecorated);
        color: $selected_fg_color;
        background-color: transparentize($selected_fg_color, 1);
      }
      &:hover {
        color: $selected_fg_color;
        outline-color: transparentize($selected_fg_color, 0.7);
        background-color: transparentize($selected_fg_color, 0.95);
        border-color: transparentize($selected_fg_color, 0.5);
      }
      &:active, &:checked {
        color: $selected_fg_color;
        outline-color: transparentize($selected_fg_color, 0.7);
        background-color: transparentize(black, 0.8);
        border-color: transparentize(black, 0.8);
      }
      &:insensitive {
        color: transparentize($selected_fg_color, 0.6);
        background-color: transparentize($selected_fg_color, 1);
        border-color: transparentize($selected_fg_color, 1);

        &:active, &:checked {
          color: transparentize($selected_fg_color, 0.6);
          background-color: transparentize(black, 0.85);
          border-color: transparentize(black, 0.85);
        }
      }
    }

    .selection-menu {
      box-shadow: none;
      padding-left: 10px;
      padding-right: 10px;
      GtkArrow { -GtkArrow-arrow-scaling: 1; }
      .arrow {
        -gtk-icon-source: -gtk-icontheme('pan-down-symbolic');
      }
    }
    .maximized & { background-color: opacify($selection_mode_bg, 1); }
  }

  .tiled &, .tiled &:backdrop,
  .maximized &, .maximized &:backdrop {
    border-radius: 0; // squared corners when the window is max'd or tiled
  }

  .maximized & {
    background-color: opacify($header_bg, 1);

    &:backdrop { background-color: opacify(lighten($header_bg, 3%), 1); }
  }

  &.default-decoration {
    padding-top: 5px;	    // less padding for ssd
    padding-bottom: 5px;  //
    background-color: opacify($header_bg, 1);
    border-bottom-width: 0;

    &:backdrop { background-color: lighten(opacify($header_bg, 1), 3%); }
  }
}

.titlebar {
  padding-left: 7px;
  padding-right: 7px;
  border-radius: 4px 4px 0 0;
  color: $header_fg;
  box-shadow: inset 0  1px lighten($header_bg, 3%);

  &:backdrop { color: transparentize($header_fg, 0.3); }
}

// Only extending .header-bar avoids some problems (Gnome Documents searchbar)
.header-bar {
  .header-bar-separator,
  & > GtkBox > .separator.vertical { @extend %header_separator; }

  @extend %header_widgets;
}

%header_separator {
  -GtkWidget-wide-separators: true;
  -GtkWidget-separator-width: 1px;
  border-width: 0 1px;
  border-image: linear-gradient(to bottom,
                                transparentize($header_fg, 1) 25%,
                                transparentize($header_fg, 0.65) 25%,
                                transparentize($header_fg, 0.65) 75%,
                                transparentize($header_fg, 1) 75%) 0 1/0 1px stretch;

  &:backdrop { opacity: 0.6; }
}

%header_widgets {
  // Header-bar Entries
  .entry {
    @include entry(header-normal);

    &:backdrop { opacity: 0.85; }

    &:focus { @include entry(header-focus); }
    &:insensitive { @include entry(header-insensitive); }

    &:selected:focus {
      background-color: $selected_fg_color;
      color: $selected_bg_color;
    }
  }

  // Header-bar Buttons
  .button {

    @include button(header-normal);

    &:backdrop { opacity: 0.7; }

    &:hover { @include button(header-hover); }
    &:active, &:checked { @include button(header-active); }
    &:insensitive { @include button(header-insensitive); }
    &:insensitive:active, &:insensitive:checked { @include button(header-insensitive-active); }
  }

    .linked > .button { border-radius: 3px; border-style: solid}

    .linked > .button:hover { box-shadow: none; }

    .linked.stack-switcher > .button,
    .linked.path-bar > .button {
      @include button(header-hover);

      &:hover { border-color: $selected_bg_color; }
      &:active, &:checked { @include button(header-active); }

      @extend %linked;
    }

  // Suggested and Destructive Action buttons
  @each $b_type, $b_color in (suggested-action, $suggested_color),
                             (destructive-action, $destructive_color) {
    .button.#{$b_type} {
      color: $selected_fg_color;
      border-color: $b_color;
      background-color: $b_color;

      &.flat {
        @include button(undecorated);
        color: $b_color;
      }
      &:hover {
        color: $selected_fg_color;
        border-color: lighten($b_color, 9%);
        background-color: lighten($b_color, 9%);
      }
      &:active, &:checked {
        color: $selected_fg_color;
        border-color: darken($b_color, 7%);
        background-color: darken($b_color, 7%);
      }
      &.flat:insensitive {

      }
      &:insensitive {
        color: transparentize($selected_fg_color, 0.4);
        border-color: transparentize($b_color, 0.35);
        background-color: transparentize($b_color, 0.35);

        &:active, &:checked {

        }
      }
    }
    .button.#{$b_type}:backdrop,
    .button.#{$b_type}:backdrop {
      opacity: 0.8;
    }
  }

  // Header-bar Spinbuttons
  & .spinbutton {

      &:focus .button { color: $selected_fg_color; }

      .button {
        color: $header_fg;

        &:hover { background-color: rgba(255,255,255,0.1); border-color: transparent; }
        &:insensitive { color: transparentize($header_fg, 0.3); }
        &:active { background-color: rgba(0,0,0,0.1); }
    }
  }

  // Header-bar ComboBoxes
  & GtkComboBox{
    &:insensitive { color: transparentize($header_fg, 0.6); }

    &.combobox-entry .button {
      @include entry(header-normal);

      &:hover { @include entry(header-focus); }
      &:insensitive { @include entry(header-insensitive); }
    }
  }

  // Header-bar Switches
  GtkSwitch {
    &:backdrop { opacity: 0.75; }
  }

  GtkProgressBar {

    &.trough { background-color: transparentize($header_fg, 0.65); }

    &:backdrop { opacity: 0.75; }
  }

  .scale {

    &:backdrop { opacity: 0.75; }

    &.trough {
      background-image: linear-gradient(to bottom, transparentize($header_fg, 0.65));

      &:insensitive { background-image: linear-gradient(to bottom, transparentize($header_fg, 0.7)); }
    }
    &.slider {
      background-image: linear-gradient(to bottom, mix($base_color, $header_bg, 90%));

      &:insensitive { background-image: linear-gradient(to bottom, mix($base_color, $header_bg, 40%)); }
    }
  }
}

/************
 * Pathbars *
 ************/

.path-bar .button {
  //padding: 5px 6px 6px;
  &:first-child { padding-left: 8px; }
  &:last-child { padding-right: 8px; }
  &:only-child {
    padding-left: 12px;
    padding-right: 12px;
  }

  // the following is for spacing the icon and the label inside the home button
  GtkLabel:last-child { padding-left: 2px; }
  GtkLabel:first-child { padding-right: 2px; }
  GtkLabel:only-child { padding-right: 0; padding-left: 0; }
  //GtkImage { padding-top: 1px; }
}

/**************
 * Tree Views *
 **************/
GtkTreeView.view {                                      // treeview grid lines and expanders, unfortunatelly
                                                        // the tree lines color can't be set
  -GtkTreeView-grid-line-width: 1;
  -GtkTreeView-grid-line-pattern: '';
  -GtkTreeView-tree-line-width: 1;
  -GtkTreeView-tree-line-pattern: '';
  -GtkTreeView-expander-size: 16;

  border-left-color: transparentize($fg_color, 0.85);   // this is actually the tree lines color,
  border-top-color: transparentize(black, 0.9);         // while this is the grid lines color, better then nothing

  &:selected {
    border-radius: 0;
    border-left-color: mix($selected_fg_color, $selected_bg_color, 50%);
    border-top-color: transparentize($fg_color, 0.9);   // doesn't work unfortunatelly
  }

  &:insensitive {
    color: $insensitive_fg_color;
    &:selected {
      color: mix($selected_fg_color, $selected_bg_color, 40%);
    }
  }

  &.dnd {
    border-style: solid none;
    border-width: 1px;
    border-color: mix($fg_color, $selected_bg_color, 50%);
  }

  &.expander {
    -gtk-icon-source: -gtk-icontheme('pan-end-symbolic');
    &:dir(rtl) { -gtk-icon-source: -gtk-icontheme('pan-end-symbolic-rtl'); }

    color: mix($fg_color, $base_color, 50%);

    &:hover { color: $fg_color; }

    &:selected {
      color: mix($selected_fg_color, $selected_bg_color, 70%);
      &:hover { color: $selected_fg_color; }
    }

    &:checked {
      -gtk-icon-source: -gtk-icontheme('pan-down-symbolic');
    }
  }

  &.progressbar { // progress bar in treeviews
    color: $selected_fg_color;
    border-radius: 3px;

    &:selected {
      color: $selected_bg_color;
      box-shadow: none;
      background-color: $selected_fg_color;
    }
  }

  &.trough, &.trough:selected { // progress bar trough in treeviews
    background-color: $button_border;
    border-radius: 3px;
    border-width: 0;
  }
}

column-header {
  .button {
    @extend %column_header_button;
    $_column_header_color: mix($fg_color,$base_color,80%);
    color: $_column_header_color;
    background-color: $base_color;
    &:hover {
      @extend %column_header_button;
      color: $selected_bg_color;
      box-shadow: none;
      transition: none; //I shouldn't need this
    }
    &:active {
      @extend %column_header_button;
      color: $fg_color;
      transition: none; //I shouldn't need this
    }
    &.dnd {
      @extend column-header.button.dnd;
    }
  }
  &:last-child .button,
  &:last-child.button { //treeview-like derived widgets in Banshee and Evolution
    border-right-style: none;
    border-image: none;
  }
}

column-header.button.dnd { // for treeview-like derive widgets
  transition: none;
  color: $selected_bg_color;
  box-shadow: inset 1px 1px 0 1px $selected_bg_color,
              inset -1px 0 0 1px $selected_bg_color,
              inset 1px 1px $base_color, inset -1px 0 $base_color;;
  &:active { @extend column-header.button.dnd; }
  &:selected { @extend column-header.button.dnd; }
  &:hover { @extend column-header.button.dnd; }
}

%column_header_button {
  padding: 3px 6px;
  background-image: none;
  border-style: none solid none none;
  border-radius: 0;
  border-image: linear-gradient(to bottom,
                                transparentize(black, 1) 20%,
                                transparentize(black, 0.89) 20%,
                                transparentize(black, 0.89) 80%,
                                transparentize(black, 1) 80%) 0 1 0 0 / 0 1px 0 0 stretch;

  &:active { background-color: $base_color; }
  &:insensitive {
    border-color: $bg_color;
    background-image: none;
  }
}

/*********
 * Menus *
 *********/
.menubar {
  -GtkWidget-window-dragging: true;
  padding: 0px;
  background-color: opacify($header_bg, 1);
  color: $header_fg;

  &:backdrop { background-color: lighten(opacify($header_bg, 1), 3%); }

  & > .menuitem {
    padding: 6px 8px;
    border: solid transparent;
    border-width: 0;

    &:hover { //Seems like it :hover even with keyboard focus
      background-color: $selected_bg_color;
      color: $selected_fg_color;
    }
    &:insensitive {
      color: transparentize($header_fg, 0.6);
      border-color: transparent;
    }
  }
}

.menu, .popup {
  margin: 4px;
  padding: 0;
  border-radius: 0;
  background-color: $base_color;
  border: 1px solid $borders_color;

  .csd & {
    padding: 4px 0px;
    border-radius: 3px;
    border: none;
  }

  .menuitem {
    padding: 5px;
    &:hover {
      color: $fg_color;
      background-color: transparentize(black, 0.96);
      border: solid transparentize(black, 0.92);
      border-width: 1px 0 1px 0;
    }
    &:insensitive {
      color: $insensitive_fg_color;
    }

    &.separator { color: $base_color; }

    //submenu indicators
    &.arrow { -gtk-icon-source: -gtk-icontheme('pan-end-symbolic'); }
    &.arrow:dir(rtl) {-gtk-icon-source:-gtk-icontheme('pan-end-symbolic-rtl'); }
  }
  &.button { // overlow buttons
    @extend %undecorated_button;
    border-style: none;
    border-radius: 0;
    &.top { border-bottom: 1px solid mix($fg_color, $base_color, 10%); }
    &.bottom { border-top: 1px solid mix($fg_color, $base_color, 10%); }
    &:hover { background-color: mix($fg_color, $base_color, 10%); }
    &:insensitive {
      color: transparent;
      background-color: transparent;
      border-color: transparent ;
    }
  }
}

.menuitem .accelerator { color: gtkalpha(currentColor,0.55); }

/************
 * Popovers *
 ************/

.popover {
  padding: 2px;
  border: 1px solid darken($borders_color, 5%);
  border-radius: 3px;
  background-clip: border-box;
  background-color: $base_color;

  box-shadow: 0 2px 6px 1px transparentize(black, 0.93);

  & .separator { color: transparentize(black, 1); }
  .label.separator { @extend .label.separator; } // Noice

  > .list,
  > .view,
  > .toolbar,
  &.osd > .toolbar {
    border-style: none;
    background-color: transparent;
  }
  &.osd { @extend %osd; }
}

//touch selection handlebars for the Popover.osd above
.entry.cursor-handle,
.cursor-handle {
  background-color: transparent;
  background-image: none;
  box-shadow: none;
  border-style: none;
  &.top { -gtk-icon-source: -gtk-icontheme('selection-start-symbolic'); }
  &.bottom { -gtk-icon-source: -gtk-icontheme('selection-end-symbolic'); }
}

/*****************
 * Notebooks and *
 * Tabs          *
 *****************/

.notebook {
  // Through me you go to the grief wracked city;
  // Through me you go to everlasting pain;
  // Through me you go a pass among lost souls.
  // ...
  // Abandon all hope — Ye Who Enter Here
  padding: 0;
  background-color: darken($base_color, 0.5%);
  -GtkNotebook-initial-gap: 10;
  -GtkNotebook-arrow-spacing: 5;
  -GtkNotebook-tab-curvature: 0;
  -GtkNotebook-tab-overlap: -8;
  -GtkNotebook-has-tab-gap: false;
  -GtkWidget-focus-padding: 0;
  -GtkWidget-focus-line-width: 0;
  transition: all 200ms $ease-out-quad;

  &.frame {
    border: 1px solid $borders_color;
    // FIXME doesn't work
    &.top { border-top-width: 0; }
    &.bottom { border-bottom-width: 0; }
    &.right { border-right-width: 0; }
    &.left { border-left-width: 0; }
  }
  &.header {
    // FIXME: double borders in some case, can't fix it w/o a class tho
    // FIXME: doesn't work on dark var
    background-color: $base_color;

    // this is the shading of the header behind the tabs
    &.frame {
      border: 1px solid $borders_color;
      &.top { border-bottom-width: 0; }
      &.bottom { border-top-width: 0; }
      &.right { border-left-width: 0; }
      &.left { border-right-width: 0; }
    }

    $_header_border: lighten($borders_color, 5%);
    &.top {
      box-shadow: inset 0 -1px $_header_border; // border
    }
    &.bottom {
      box-shadow: inset 0 1px $_header_border;
    }
    &.right {
      box-shadow: inset 1px 0 $_header_border;
    }
    &.left {
      box-shadow: inset -1px 0 $_header_border;
    }
  }
  tab {
    border-width: 0;
    border-style: solid;
    border-color: transparent;
    background-color: transparent;
    outline-color: transparent;

    outline-offset: 0;

    //vertical tab sizing
    $vt_vpadding: 5px;
    $vt_hpadding: 20px;
    // horizontal tab sizing
    $ht_vpadding: 5px;
    $ht_hpadding: 20px;

    //FIXME: we get double border in some cases, not considering the broken
    //notebook content frame...
    &.top, &.bottom { padding: $vt_vpadding $vt_hpadding; }
    &.left, &.right { padding: $ht_vpadding $ht_hpadding; }

    &.reorderable-page {
      &.top, &.bottom {
        padding-left: 12px;  // for a nicer close button
        padding-right: 12px; // placement
        //border-left-width: 1px;
        //border-right-width: 1px;
      }
      &.left, &.right {
        //border-bottom-width: 1px;
        //border-top-width: 1px;
      }
    }
    @each $_tab in (top, bottom, right, left) {
      &.reorderable-page.#{$_tab}, &.#{$_tab} {
        border-color: transparent;
        &:hover, &.prelight-page {
          border-color: transparentize($borders_color, 0.5);
          border-width: 1px;
          border-#{$_tab}-width: 0;
          background-color: transparentize($bg_color,0.8);
        }
        &:active, &.active-page, &.active-page:hover {
          border-width: 1px;
          border-#{$_tab}-width: 0;
          border-color: $borders_color;
          background-color: transparentize(black, 0.98);
          &:hover { background-color: transparentize(black, 0.98); }
        }
      }
    }
    GtkLabel { //tab text
      padding: 0 2px; // needed for a nicer focus ring
      font-weight: bold;
      color: $insensitive_fg_color;
    }
    .prelight-page GtkLabel, GtkLabel.prelight-page {
      // prelight tab text
      color: mix($fg_color, $insensitive_fg_color, 50%);
    }
    .active-page GtkLabel, GtkLabel.active-page {
      // active tab text
      color: $fg_color;
    }
    .button { //tab close button
      padding: 0;
      @extend %undecorated_button;
      color: mix($bg_color, $fg_color, 35%);

      &:hover {
        color: lighten(red, 15%);
      }
      &:active {
        color: $selected_bg_color;
      }
      & > GtkImage { // this is a hack which makes tabs grow
        padding: 2px;
      }
    }
  }
  &.arrow {
    color: $insensitive_fg_color;
    &:hover { color: mix($fg_color, $insensitive_fg_color, 50%); }
    &:active { color: $fg_color; }
    &:insensitive {
      color: transparentize($insensitive_fg_color,0.7);
    }
  }
}

/**************
 * Scrollbars *
 **************/

$_scrollbar_bg_color: darken($base_color, 1%);

.scrollbar {
  -GtkRange-slider-width: 13;
  -GtkRange-trough-border: 1;
  -GtkScrollbar-has-backward-stepper: false;
  -GtkScrollbar-has-forward-stepper: false;
  -GtkScrollbar-min-slider-length: 42; // minimum size for the slider.
                                       // sadly can't be in '.slider'
                                       // where it belongs
  -GtkRange-stepper-spacing: 0;
  -GtkRange-trough-under-steppers: 1;

  $_slider_margin: 3px;
  $_slider_fine_tune_margin: 4px;

  .button {
    border: none;
  }

  &.overlay-indicator {
    &:not(.dragging):not(.hovering) { // Overlay scrolling indicator
      opacity: 0.4;

      -GtkRange-slider-width: 6px;

      .slider {
        margin: 0;
        background-color: mix($fg_color, $bg_color, 70%);
        border: 1px solid transparentize(white, 0.4);
        background-clip: padding-box;
      }

      .trough {
        border-style: none;
        background-color: transparent;
      }

      // w/o the following margin tweaks the slider shrinks when hovering/dragging
      &.vertical .slider {
        margin-top: $_slider_margin - 1px;
        margin-bottom: $_slider_margin - 1px;
      }

      &.horizontal .slider {
        margin-left: $_slider_margin - 1px;
        margin-right: $_slider_margin - 1px;
      }

    }

    &.dragging,
    &.hovering { opacity: 0.99; }
  }

  // trough coloring
  .trough {
    background-color: $_scrollbar_bg_color;
    border: 1px none $borders_color;
  }

  // slider coloring
  .slider {
    background-color: mix($fg_color, $bg_color, 40%);

    &:hover { background-color: mix($fg_color, $bg_color, 30%); }

    &:prelight:active { background-color: $selected_bg_color;}

    &:insensitive {
      background-color: transparent;
    }
  }

  // sizing
  .slider {
    border-radius: 100px;
    margin: $_slider_margin;
  }

  &.fine-tune .slider { margin: $_slider_fine_tune_margin; }

  &.vertical {

    .slider {
      margin-left: 1px + $_slider_margin;

      &:dir(rtl) {
        margin-left: $_slider_margin;
        margin-right: 1px + $_slider_margin;
      }
    }

    &.fine-tune .slider {
      margin-left: 1px + $_slider_fine_tune_margin;

      &:dir(rtl) {
        margin-left: $_slider_fine_tune_margin;
        margin-right: 1px + $_slider_fine_tune_margin;
      }
    }

    .trough {
      border-left-style: solid;

      &:dir(rtl) {
        border-left-style: none;
        border-right-style: solid;
      }
    }
  }

  &.horizontal {

    .slider { margin-top: 1px + $_slider_margin; }

    &.fine-tune .slider { margin-top: 1px + $_slider_fine_tune_margin; }

    .trough { border-top-style: solid; }
  }
}

.scrollbars-junction,
.scrollbars-junction.frame { // the small square between two scrollbars
  border-color: transparent;
  // the border image is used to add the missing dot between the borders, details, details, details...
  border-image: linear-gradient(to bottom, $borders_color 1px, transparent 1px) 0 0 0 1 / 0 1px stretch;
  background-color: $_scrollbar_bg_color;

  &:dir(rtl) { border-image-slice: 0 1 0 0; }
}


/**********
 * Switch *
 **********/
GtkSwitch {
  font: 1;
  -GtkSwitch-slider-width: 41;

  &.trough, &.slider {
    background-size: 52px 24px;
    background-repeat: no-repeat;
    background-position: right center;
    color: transparent;
    border-color: transparent;
    border-image: none;
    border-style: none;
    box-shadow: none;

    &:dir(rtl) { background-position: left center; }
  }
}

@each $i,$j in ('',''), ('.header-bar ','-header'), ('.list-row:selected ','-selected') {

  @each $k,$l in ('',''),
                 (':active','-active'),
                 (':insensitive','-insensitive'),
                 (':active:insensitive','-active-insensitive') {

    // load switch troughs from .png files in assets directory

    #{$i}GtkSwitch.trough#{$k} {
      background-image: -gtk-scaled(url("assets/switch#{$l}#{$j}.png"),url("assets/switch#{$l}#{$j}@2.png"));
    }

    // load switch sliders from .png files in assets directory

    //#{$i}GtkSwitch.slider#{$k} {
    //  background-image: -gtk-scaled(url("assets/switch-slider#{$l}#{$j}.png"),url("assets/switch-slider#{$l}#{$j}@2.png"));
    //}
  }
}

/*************************
 * Check and Radio items *
 *************************/

// draw regular check and radio items using our PNG assets
// all assets are rendered from assets.svg. never add pngs directly

@each $w,$a in ('check', 'checkbox'),
               ('radio','radio') {

  //standard checks and radios
  @each $s,$as in ('','-unchecked'),
                  (':insensitive','-unchecked-insensitive'),
                  (':inconsistent', '-mixed'),
                  (':inconsistent:insensitive', '-mixed-insensitive'),
                  (':checked', '-checked'),
                  (':checked:insensitive','-checked-insensitive') {
    .#{$w}#{$s} {
      -gtk-icon-source: -gtk-scaled(url("assets/#{$a}#{$as}.png"),
                                    url("assets/#{$a}#{$as}@2.png"));
    }
    // the borders of checks and radios are
    // too similar in luminosity to the selected background color, hence
    // we need special casing.
    GtkTreeView.view.#{$w}#{$s}:selected,
    .list-row:selected .#{$w}#{$s} {
      -gtk-icon-source: -gtk-scaled(url("assets/#{$a}#{$as}-selected.png"),
                                    url("assets/#{$a}#{$as}-selected@2.png"));
    }
  }
}

//selection-mode
@each $s,$as in ('','-selectionmode'),
                  (':checked', '-checked-selectionmode') {
  GtkIconView.view.check#{$s},
  GtkFlowBox.view.check#{$s} {
    -gtk-icon-source: -gtk-scaled(url("assets/checkbox#{$as}.png"),
                                    url("assets/checkbox#{$as}@2.png"));
    background-color: transparent;
  }
}

GtkCheckButton.text-button, GtkRadioButton.text-button {
  // this is for a nice focus on check and radios text
  padding: 1px 2px 4px;
  outline-offset: 0;
  &:insensitive,
  &:insensitive:active,
  &:insensitive:inconsistent {
    // set insensitive color, which is overriden otherwise
    color: $insensitive_fg_color;
  }
}

/************
 * GtkScale *
 ************/
.scale {
  -GtkScale-slider-length: 15;
  -GtkRange-slider-width: 15;
  -GtkRange-trough-border: 0;
  outline-offset: -1px;
  outline-radius: 2px;
  //@include _shadows(_button_shadow(normal));

  &.trough { margin: 5px; }
  &.fine-tune {
    &.trough { border-radius: 5px; margin: 3px; }
  }
  &.slider {
    background-clip: border-box;
    background-image: linear-gradient(to bottom, $base_color);
    border: 1px solid $selected_bg_color;
    border-radius: 50%;
    box-shadow: none;

    &:hover {
    background-image: linear-gradient(to bottom, $selected_bg_color);
    border-color: $selected_bg_color;
    }
    &:insensitive {
      background-image: linear-gradient(to bottom, mix($base_color, $bg_color, 55%));
      border-color: mix($selected_bg_color, $bg_color, 55%);
    }
    &:active {
      background-image: linear-gradient(to bottom, darken($selected_bg_color, 10%));
      border-color: darken($selected_bg_color, 10%);
    }
    //OSD sliders
    .osd & {
      background-image: linear-gradient(to bottom, $osd_bg_color);
      border-color: $selected_bg_color;

      &:hover { background-image: linear-gradient(to bottom, $selected_bg_color); }
      &:active {
        background-image: linear-gradient(to bottom, darken($selected_bg_color, 10%));
        border-color: darken($selected_bg_color, 10%);
      }
    }
    //selected list-row sliders
    .list-row:selected & {
      background-image: linear-gradient(to bottom, $selected_fg_color);
      border-color: $selected_fg_color;

      &:hover {
        background-image: linear-gradient(to bottom, mix($selected_fg_color, $selected_bg_color, 85%));
        border-color: mix($selected_fg_color, $selected_bg_color, 85%);
      }
      &:active {
        background-image: linear-gradient(to bottom, mix($selected_fg_color, $selected_bg_color, 50%));
        border-color: mix($selected_fg_color, $selected_bg_color, 50%);
      }
      &:insensitive{
        background-image: linear-gradient(to bottom, mix($selected_fg_color, $selected_bg_color, 55%));
        border-color: mix($selected_fg_color, $selected_bg_color, 55%);
      }
    }
  }
  &.trough {
    border: none;
    border-radius: 2.5px;
    background-image: linear-gradient(to bottom, $button_border);
    &.highlight {
      background-image: linear-gradient(to bottom, $selected_bg_color);

      &:insensitive {
        background-image: linear-gradient(to bottom, transparentize($selected_bg_color, 0.45));
      }
    }
    &:insensitive {
      background-image: linear-gradient(to bottom, transparentize($button_border, 0.45));
    }

    //OSD troughs
    .osd & {
      background-image: linear-gradient(to bottom, lighten($osd_bg_color, 7%));
      outline-color: transparentize($osd_fg_color, 0.8);
      &.highlight {
        background-image: none;
        background-image: linear-gradient(to bottom, $selected_bg_color);
      }
      &:insensitive {  }
    }
    // troughs in selected list-rows
    .list-row:selected & {
      background-image: linear-gradient(to bottom, transparentize(black, 0.8));

      &.highlight {
        background-image: linear-gradient(to bottom, $selected_fg_color);

        &:insensitive { background-image: linear-gradient(to bottom, mix($selected_fg_color, $selected_bg_color, 55%)); }
      }
      &:insensitive { background-image: linear-gradient(to bottom, transparentize(black, 0.9)); }
    }
  }
}

/*****************
 * Progress bars *
 *****************/

GtkProgressBar {
  padding: 0;
  font-size: smaller;
  color: transparentize($fg_color, 0.3);
  //@include _shadows(_button_shadow(normal));

  &.osd {
    -GtkProgressBar-xspacing: 0;
    -GtkProgressBar-yspacing: 0;
    -GtkProgressBar-min-horizontal-bar-height: 3;
  }
}

// moving bit
.progressbar {
  background-color: $selected_bg_color;
  border: none;
  border-radius: 3px;
  box-shadow: none; //needed for clipping
  &.left.right {

  }
  &.osd {
    background-color: $selected_bg_color;
  }
}

.osd .scale.progressbar {
  background-color: $selected_bg_color;
}

// background
GtkProgressBar.trough {
  border: none;
  border-radius: 3px;
  background-color: $button_border;

  &.osd {
    border-style: none;
    background-color: transparent;
    box-shadow: none;
    //FIXME: there is a margin on top
  }
}

/*************
 * Level Bar *
 *************/

GtkLevelBar {
  -GtkLevelBar-min-block-width: 34;
  -GtkLevelBar-min-block-height: 3;
}

GtkLevelBar.vertical {
  -GtkLevelBar-min-block-width: 3;
  -GtkLevelBar-min-block-height: 34;
}

.level-bar {
  &.trough {
    @extend GtkProgressBar.trough;
    padding: 3px;
    border-radius: 4px;
  }
  &.fill-block {
    // FIXME: it would be nice to set make fill blocks bigger, but we'd need
    // :nth-child working on discrete indicators
    border: 1px solid $selected_bg_color;
    background-color: $selected_bg_color;
    border-radius: 2px;

    &.indicator-discrete {
      &.horizontal { margin: 0 1px; }
      &.vertical { margin: 1px 0; }
    }
    &.level-high {
      border-color: $success_color;
      background-color: $success_color;
    }
    &.level-low {
      border-color: $warning_color;
      background-color: $warning_color;
    }
    &.empty-fill-block {
      background-color: transparentize($fg_color,0.8);
      border-color: transparentize($fg_color,0.8);
    }
  }
}


/**********
 * Frames *
 **********/
.frame {
  border: 1px solid $borders_color;
  &.flat { border-style: none; }
  padding: 0;
  &.action-bar {
    padding: 6px;
    border-width: 1px 0 0;
  }
}

GtkScrolledWindow {
  GtkViewport.frame { // avoid double borders when viewport inside
                      // scrolled window
    border-style: none;
  }
}

//vbox and hbox separators
.separator {
  // always disable separators
  // -GtkWidget-wide-separators: true;
  color: transparentize(black, 0.9);

  // Font and File button separators
  GtkFileChooserButton &,
  GtkFontButton &,
  GtkFileChooserButton &.vertical,
  GtkFontButton &.vertical {
    // always disable separators
    -GtkWidget-wide-separators: true;
  }
}

/*********
 * Lists *
 *********/

.list, .list-row {
  background-color: $base_color;
  border-color: $borders_color;
}

.list-row,
.grid-child {
  padding: 2px;
}

.list-row.button {
  @extend %undecorated_button;
  background-color: transparentize(black, 1); // for the transition
  border-style: none; // I need no borders here
  border-radius: 0;   // and no rounded corners
  box-shadow: none;   // and no box-shadow
  &:hover {
    background-color: transparentize(black, 0.95);
  }
  &:active {
    color: $fg_color;
  }
  &:selected {
    &:active { color: $selected_fg_color; }
    &:hover { background-color: mix(black, $selected_bg_color, 10%); }
    &:insensitive {
      color: transparentize($selected_fg_color, 0.3);
      background-color: transparentize($selected_bg_color, 0.3);
      .label { color: inherit; }
    }
  }
}

.list-row:selected {
  @extend %selected_items;
  .button { @extend %selected-button }
}

// transition
.list-row, list-row.button {
  transition: all 300ms $ease-out-quad;
  &:hover { transition: none; }
}

/*********************
 * App Notifications *
 *********************/

.app-notification,
.app-notification.frame {
  padding: 10px;
  border-radius: 0 0 2.5px 2.5px;
  border-width: 0 1px 1px;
  border-style: solid;
  border-color: rgba(0,0,0,0.2);
  background-color: $base_color;

  background-clip: padding-box;
}

/*************
 * Expanders *
 *************/

.expander {
  -gtk-icon-source: -gtk-icontheme('pan-end-symbolic');
  &:dir(rtl) { -gtk-icon-source: -gtk-icontheme('pan-end-symbolic-rtl'); }
  &:hover { color: lighten($fg_color,30%); } //only lightens the arrow
  &:checked { -gtk-icon-source: -gtk-icontheme('pan-down-symbolic'); }
}

/************
 * Calendar *
 ***********/
GtkCalendar {
  border: 1px solid $borders_color;
  border-radius: 3px;
  padding: 2px;

  &:selected {
    background-color: $selected_bg_color;
    color: $selected_fg_color;
    border-radius: 1.5px;
  }
  &.header {
    color: $fg_color;
    border: none;
    border-radius: 0;
  }
  &.button, &.button:focus {
    color: transparentize($fg_color,0.55);
    box-shadow: none;
    border: none;
    &:hover {
      color: $fg_color;
    }
  }
  &.highlight { color: gtkalpha(currentColor,0.55); }
}

/***********
 * Dialogs *
 ***********/
.message-dialog .dialog-action-area .button {
  padding: 8px;
}

.message-dialog { // Message Dialog styling
  -GtkDialog-button-spacing: 0;

  .titlebar { background-color: $header_bg; border-bottom: 1px solid darken($header_bg, 7%) }

  &.csd { // rounded bottom border styling for csd version
    &.background {
      border-bottom-left-radius: 3px;
      border-bottom-right-radius: 3px;
      border: none;
    }
    .dialog-action-area .button {
      padding: 8px;
      border-radius: 0;

      @extend %middle_button;

      &:hover, &:active, &:insensitive {
        @extend %middle_button;
      }

      &:focus {
        color: $selected_bg_color;

        &:active, &:checked { color: $selected_fg_color; }
      }

//      @each $b_type, $b_color in (suggested-action, $selected_bg_color),
//                                 (destructive-action, $destructive_color) {
//        &.#{$b_type} {
//          @include button(normal, $b_color, white, $edge:none);
//          @extend %middle_button;
//          &:hover {
//            @include button(hover, $b_color, white, $edge:none);
//            @extend %middle_button;
//          }
//          &:active {
//            @include button(active, $b_color, white, $edge:none);
//            @extend %middle_button;
//          }
//          &:insensitive {
//            @include button(insensitive, $edge:none);
//           @extend %middle_button;
//          }
//        }
//      }
      &:first-child{ @extend %first_button; }
      &:last-child { @extend %last_button; }
    }
    %middle_button {
      border-right-style: none;
      border-bottom-style: none;
    }
    %last_button {
      border-bottom-right-radius: 3px;
    }
    %first_button {
      border-left-style: none;
      border-bottom-left-radius: 3px;
    }
  }
}

GtkFileChooserDialog {
  .search-bar {
    background-color: $bg_color;
    border-color: $borders_color;
    box-shadow: none;
  }
  .dialog-action-box {
    border-top: 1px solid $borders_color;
  }
}

/***********
 * Sidebar *
 ***********/
.sidebar {
  border: none;
  background-color: $bg_color;

  &:selected {
    background-color: $selected_bg_color;
  }
}

// Places sidebar is a special case, since the view here have to look like chrome not content, so we override text color
GtkPlacesSidebar.sidebar .view {

  color: $fg_color;
  background-color: transparent;

  &:selected {
    color: $selected_fg_color;
    background-color: $selected_bg_color;
  }

  &.separator { @extend .separator; }
}

.sidebar-item {
  padding: 10px 4px;
  > GtkLabel {
    padding-left: 6px;
    padding-right: 6px;
  }
  &.needs-attention > GtkLabel {
    @extend %needs_attention;
    background-size: 6px 6px, 0 0;
  }
}

//
// Paned
//
GtkPaned {                        // this is for the standard paned separator

  -GtkPaned-handle-size: 1;       // sets separator width

  -gtk-icon-source: none;         // removes handle decoration
  margin: 0 8px 8px 0;            // drag area of the separator, not a real margin

  &:dir(rtl) {
    margin-right: 0;
    margin-left: 8px;
  }
  .pane-separator {
    background-color: $borders_color;
  }
}

GtkPaned.wide {                     // this is for the paned with wide separator
  -GtkPaned-handle-size: 5;         // wider separator here
  margin: 0;                        // no need of the invisible drag area so, reset margin
  .pane-separator {
    background-color: transparent;
    border-style: none solid;
    border-color: $borders_color;
    border-width: 1px;
  }
  &.vertical .pane-separator { border-style: solid none;}
}

/**************
 * GtkInfoBar *
 **************/
GtkInfoBar {
  border-style: none;

  .button { @extend %selected-button }
}

.info,
.question,
.warning,
.error {
  background-color: $selected_bg_color;
  color: $selected_fg_color;
}


//
// Buttons on selected backgrounds
//
%selected-button {
  color: $selected_fg_color;
  outline-color: transparentize($selected_fg_color, 0.7);
  background-color: transparentize($selected_fg_color, 1);
  border-color: transparentize($selected_fg_color, 0.5);

  &.flat {
    @include button(undecorated);
    color: $selected_fg_color;
    background-color: transparentize($selected_fg_color, 1);
  }
  &:hover {
    color: $selected_fg_color;
    outline-color: transparentize($selected_fg_color, 0.7);
    background-color: transparentize($selected_fg_color, 0.8);
    border-color: transparentize($selected_fg_color, 0.2);
  }
  &:active, &:checked {
    color: $selected_fg_color;
    outline-color: transparentize($selected_fg_color, 0.7);
    background-color: transparentize(black, 0.8);
    border-color: transparentize($selected_fg_color, 0.2);
  }
  &:insensitive {
    color: transparentize($selected_fg_color, 0.6);
    background-color: transparentize($selected_fg_color, 1);
    border-color: transparentize($selected_fg_color, 0.8);

    &:active, &:checked {
      color: transparentize($selected_fg_color, 0.6);
      background-color: transparentize(black, 0.9);
      border-color: transparentize($selected_fg_color, 0.8);
    }
  }
}

/************
 * Tooltips *
 ************/
.tooltip {
  &.background {
    // background-color needs to be set this way otherwise it gets drawn twice
    // see https://bugzilla.gnome.org/show_bug.cgi?id=736155 for details.
    background-color: $tooltip_bg;
    background-clip: padding-box;
  }

  color: $tooltip_fg;
  border-radius: 2px;

  &.window-frame.csd {
    background-color: transparent;
  }
}

.tooltip * { //Yeah this is ugly
  padding: 4px;
  background-color: transparent;
  color: inherit; // just to be sure
}

/*****************
 * Color Chooser *
 *****************/

GtkColorSwatch {
  // This widget is made of two boxes one on top of the other, the lower box is GtkColorSwatch {} the other one
  // is GtkColorSwatch .overlay {}, GtkColorSwatch has the programmatically set background, so most of the style
  // is applied to the overlay box.

  // take care of colorswatches on selected elements
  :selected & {
    box-shadow: none;
    &.overlay, &.overlay:hover {
      border-color: $selected_fg_color;
    }
  }

  // border rounding
  &.top {
    border-top-left-radius: 3px;
    border-top-right-radius: 3px;
  }
  &.bottom {
    border-bottom-left-radius: 3px;
    border-bottom-right-radius: 3px;
  }
  &.left, &:first-child, &:first-child .overlay {
    border-top-left-radius: 3px;
    border-bottom-left-radius: 3px;
  }
  &.right, &:last-child, &:last-child .overlay {
    border-top-right-radius: 3px;
    border-bottom-right-radius: 3px;
  }
  &:only-child, &:only-child .overlay {
    border-radius: 3px;
  }
  // nth-child works just on the custom colors row

  // hover effect
  &:hover,
  &:hover:selected {
    background-image: linear-gradient(to bottom, transparentize(white, 0.8));
  }

  // no hover effect for the colorswatch in the color editor
  GtkColorEditor & {
    border-radius: 3px; // same radius as the entry
    &:hover {
      background-image: none;
    }
  }

  // indicator and keynav outline colors, color-dark is a color with luminosity lower then 50%
  &.color-dark {
    color: white;
    outline-color: transparentize(black, 0.7);
  }
  &.color-light {
    color: black;
    outline-color: transparentize(white, 0.5);
  }

  // border color
  &.overlay,
  &.overlay:selected {
    border: 1px solid transparentize(black, 0.85);
    &:hover { border-color: transparentize(black, 0.75); }
  }

  // make the add color button looks like, well, a button
  &#add-color-button {
    border-style: solid; // the borders are drawn by the overlay for standard colorswatches to have them semi
    border-width: 1px;   // translucent on the colored background, here it's not necessary so they need to be set
    @include button(normal);
    &:hover { @include button(hover); }
    .overlay { @include button(undecorated); } // reset the overlay to not cover the button style underneath
  }
}

GtkColorButton.button {
  padding: 4px; // Uniform padding on the GtkColorButton

  GtkColorSwatch { border-radius: 0; }
}

/********
 * Misc *
 ********/
.scale-popup .button { // +/- buttons on GtkVolumeButton popup
  padding: 6px;
  &:hover {
    @include button(hover);
  }
}

GtkVolumeButton.button { padding: 8px; }

/**********************
 * Window Decorations *
 *********************/

.window-frame {
  border-radius: 4px 4px 0 0;
  // lamefun trick to get rounded borders regardless of CSD use
  border-width: 0px;

  // this needs to be transparent
  // see bug #722563
  $_wm_border: transparentize(black, 0.9);
  $_wm_border_backdrop: transparentize(black, 0.9);

  box-shadow: 0 0 0 1px $_wm_border, 0 4px 8px 1px $_wm_border;

  /* this is used for the resize cursor area */
  margin: 10px;

  &:backdrop {
    box-shadow: 0 0 0 1px $_wm_border, 0 4px 5px 2px $_wm_border_backdrop;
  }
  &.tiled {
    border-radius: 0;
  }
  // server-side decorations as used by mutter
  &.ssd {
    border-radius: 4px 4px 0 0;
    box-shadow: 0 0 0 1px $_wm_border;
  }
  &.csd {
    &.popup, &.menu {
      border-radius: 3px;
      box-shadow: 0 3px 6px $_wm_border,
                  0 0 0 1px $_wm_border;
    }
    &.tooltip {
      border-radius: 2px;
      box-shadow: 0 1px 3px 1px $_wm_border;
    }
    &.message-dialog {
      border-radius: 3px;
      box-shadow: 0 1px 6px $_wm_border;
    }
  }
  &.solid-csd {
    border-radius: 0;
    margin: 1px;
    background-color: $header_bg;
    box-shadow: none;
  }
}

//
// Titlebuttons
//
.header-bar,
.titlebar {

  &.default-decoration .button.titlebutton { // no vertical padding for ssd buttons
    padding-top: 0px;                        // already handled by the titlebar-padding
    padding-bottom: 0px;
  }

  .button.titlebutton {
    padding: 7px 4px;

    @include button(undecorated);
    border-width: 0;

    &:hover {
      @include button(header-hover);
    }
    &:active, &:checked {
      @include button(header-active);
    }
    //&:backdrop { color: $wm_unfocused_title; }

    &.close, &.maximize, &.minimize {

      color: transparent;
      background-color: transparent;
      background-position: center;
      background-repeat: no-repeat;

      &:backdrop { opacity: 1; }
    }

    &.close { background-image: -gtk-scaled(url('assets/titlebutton-close.png'),url('assets/titlebutton-close@2.png')); }
    &.close:backdrop { background-image: -gtk-scaled(url('assets/titlebutton-close-backdrop.png'),url('assets/titlebutton-close-backdrop@2.png')); }
    &.close:hover { background-image: -gtk-scaled(url('assets/titlebutton-close-hover.png'),url('assets/titlebutton-close-hover@2.png')); }
    &.close:active { background-image: -gtk-scaled(url('assets/titlebutton-close-active.png'),url('assets/titlebutton-close-active@2.png')); }

    &.maximize { background-image: -gtk-scaled(url('assets/titlebutton-max.png'),url('assets/titlebutton-max@2.png')); }
    &.maximize:backdrop { background-image: -gtk-scaled(url('assets/titlebutton-max-backdrop.png'),url('assets/titlebutton-max-backdrop@2.png')); }
    &.maximize:hover { background-image: -gtk-scaled(url('assets/titlebutton-max-hover.png'),url('assets/titlebutton-max-hover@2.png')); }
    &.maximize:active { background-image: -gtk-scaled(url('assets/titlebutton-max-active.png'),url('assets/titlebutton-max-active@2.png')); }

    &.minimize { background-image: -gtk-scaled(url('assets/titlebutton-min.png'),url('assets/titlebutton-min@2.png')); }
    &.minimize:backdrop { background-image: -gtk-scaled(url('assets/titlebutton-min-backdrop.png'),url('assets/titlebutton-min-backdrop@2.png')); }
    &.minimize:hover { background-image: -gtk-scaled(url('assets/titlebutton-min-hover.png'),url('assets/titlebutton-min-hover@2.png')); }
    &.minimize:active { background-image: -gtk-scaled(url('assets/titlebutton-min-active.png'),url('assets/titlebutton-min-active@2.png')); }
  }
}


// catch all extend :)

%dark_button {
  color: $header_fg;
  background-color: lighten($header_bg, 12.5%);

  GtkLabel, GtkImage { color: $header_fg; }

  &:hover {
    color: $header_fg;
    background-color: lighten($header_bg, 15%);

    GtkLabel, GtkImage { color: $header_fg; }
  }
  &:active, &:checked {
    color: $selected_bg_color;
    background-image: none;
    background-color: transparentize(darken($header_bg, 10%), 0.4);
    border-color: transparentize(darken($header_bg, 14%), 0.4);

    GtkLabel, GtkImage { color: $selected_bg_color; }
  }
}

%selected_items {
  background-image: none;
  background-color: $selected_bg_color;
  color: $selected_fg_color;
  outline-color: transparentize($selected_fg_color, 0.7);
}

/* Decouple the font of context menus from their entry/textview */
.touch-selection,
.context-menu {
  font: initial;
}

.monospace {
  font: Monospace;
}

//
// Overshoot
//
// This is used by GtkScrolledWindow, when content is touch-dragged past boundaries.
// This draws a box on top of the content, the size changes programmatically.
.overshoot {
  &.top { @include overshoot(top); }
  &.bottom { @include overshoot(bottom); }
  &.left { @include overshoot(left); }
  &.right { @include overshoot(right); }
}

//
// Undershoot
//
// Overflow indication, works similarly to the overshoot, the size if fixed tho.
.undershoot {
  &.top { @include undershoot(top); }
  &.bottom { @include undershoot(bottom); }
  &.left { @include undershoot(left); }
  &.right { @include undershoot(right); }
}