//
// Suffix
//

$asset_suffix: if($variant == 'dark', '-dark', '');


//
// transitions
//

%transition {
  // do not include sizing factors and text colors/shadows
  transition-property: opacity,
                       border-color,
                       border-image,
                       background-color,
                       background-image,
                       box-shadow,
                       icon-shadow;
  transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
  transition-duration: 0.2s;
}


/*****************
 * Common States *
 *****************/

* {
  @extend %transition; // global transition setting

  padding: 0;
  background-clip: padding-box;

  -GtkToolButton-icon-spacing: 4;
  -GtkTextView-error-underline-color: $error_color;

  -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;

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

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

  -GtkWidget-text-handle-width: 16;
  -GtkWidget-text-handle-height: 16;

  -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-style: solid;
  outline-width: 2px;
  outline-color: $track_color;
  outline-offset: -4px;
  outline-radius: 2px;

  // disable foreground-shadows as default
  text-shadow: none;
  icon-shadow: none;
}


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

.background {
  background-color: $bg_color;
  color: $fg_color;
}

// 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;
}

// for backdrop, tone down element surfaces with transparentize
%fade_effect {
  *:backdrop {
    opacity: 0.75;
    transition: 0.2s;
  }
}

.gtkstyle-fallback {
  background-color: $bg_color;
  color: $fg_color;
  &:prelight {
    background-color: darken($bg_color, 5%);
    color: $fg_color;
  }
  &:active {
    background-color: darken($bg_color, 10%);
    color: $fg_color;
  }
  &:insensitive {
    background-color: $bg_color;
    color: $insensitive_fg_color;
  }
  &:selected {
    background-color: $selected_bg_color;
    color: $selected_fg_color;
  }
}

.view {
  @extend .list-row.activatable;
  background-color: $base_color;
  color: $fg_color;
  &:hover,
  &:active,
  &:selected { border-radius: 2px; }
  &:insensitive {
    color: $insensitive_fg_color;
  }
  &:selected { @extend %selected_items; }
}

.rubberband {
  border: 1px solid $secondary_selected_bg_color;
  background-color: gtkopacity($secondary_selected_bg_color, 0.2);
}

.label {
  &.separator {
    color: $fg_color;
    @extend .dim-label;
  }

  &:selected,
  &:selected:focus,
  &:selected:hover {
    @extend %selected_items;
  }
  &:insensitive { color: $insensitive_fg_color; }

  // always use dark foreground in Gnome-Software
  &.kudo-label {
    color: $fixed_fg_color;
  }
}

.dim-label {
  opacity: 0.55;
}

GtkAssistant {
  // sidebar styling
  .sidebar {
    padding: 0.5em 0;
    &:dir(ltr) { border-right: 1px solid $borders_color; }
    &:dir(rtl) { border-left: 1px solid $borders_color; }

    .label {
      padding: 0.7em 1em 0.8em;
      color: $secondary_fg_color;
      font-weight: 500;
      &.highlight { color: $selected_bg_color; }
    }
  }

  // header-bar styling
  .header-bar {
    // apply suggested-action button for "Next" and "Back"
    // last -> "cancel", nth -> "Next" and "Back", that's weird.
    .button.flat:not(:last-child) {
      @include button(normal);
      background-color: $suggested_color;
      color: $secondary_selected_fg_color;
      &:hover {
        @include button(hover);
        color: $selected_fg_color;
      }
      &:active {
        @include button(active);
        color: $selected_fg_color;
        background-color: $selected_bg_color;
      }
      &:checked {
        @include button(checked);
        background-color: mix($selected_fg_color, $suggested_color, 20%);
        color: $selected_fg_color;
      }
      &:insensitive { @include button(insensitive); }
    }
  }
}

GtkTextView { // This will get overridden by .view,
              // needed by gedit line numbers
  background-color: $secondary_dark_color;
}

.grid-child {
  // outline-offset: -2px;
  padding: 4px;
  border-radius: 2px;
  &:selected { @extend %selected_items; }
}

%osd, .osd {
  opacity: 0.9;
}


/*********************
 * Spinner Animation *
 *********************/

@keyframes colorful_bar {
  0% {
    -gtk-icon-source: url("assets/bar-red.svg");
    -gtk-icon-transform: scale(0, 1.0);
  }
  24.9% {
    -gtk-icon-source: url("assets/bar-red.svg");
    -gtk-icon-transform: scale(1.0, 1.0);
  }
  25% {
    -gtk-icon-source: url("assets/bar-yellow.svg");
    -gtk-icon-transform: scale(1.0, 1.0);
  }
  49.9% {
    -gtk-icon-source: url("assets/bar-yellow.svg");
    -gtk-icon-transform: scale(0, 1.0);
  }
  50% {
    -gtk-icon-source: url("assets/bar-green.svg");
    -gtk-icon-transform: scale(0, 1.0);
  }
  74.9% {
    -gtk-icon-source: url("assets/bar-green.svg");
    -gtk-icon-transform: scale(1.0, 1.0);
  }
  75% {
    -gtk-icon-source: url("assets/bar-blue.svg");
    -gtk-icon-transform: scale(1.0, 1.0);
  }
  99.9% {
    -gtk-icon-source: url("assets/bar-blue.svg");
    -gtk-icon-transform: scale(0, 1.0);
  }
  100% {
    -gtk-icon-source: url("assets/bar-red.svg");
    -gtk-icon-transform: scale(0, 1.0);
  }
}

.spinner {
  background-color: blue;
  background-image: none;
  opacity: 0; // non spinning spinner makes no sense
  -gtk-icon-source: url("assets/bar-red.svg");
  &:active {
    opacity: 1.0;
    animation: colorful_bar 2s linear infinite;
    &:insensitive { opacity: 0.4; }
    &:backdrop { opacity: 1.0; }
  }
  &:backdrop { opacity: 0; }
}


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

.entry {
  padding: 0.75em 1em 0.8em;
  @include entry(normal);
  &:focus { @include entry(focus); }
  &:insensitive { @include entry(insensitive); }

  &.flat {
    @include entry(flat-normal);
    &:focus { @include entry(flat-focus); }
    &:insensitive { @include entry(flat-insensitive); }
  }

  &:selected { @extend %selected_items; }

  &.image { // icons inside the entry
    &.left { padding-left: 0.1em; }
    &.right { padding-right: 0.1em; }
  }

  &.progressbar { @extend %entry_progressbar; }

  .linked > &:not(.flat),
  .linked.vertical > &:not(.flat) {
    @extend .entry.flat;
    border-radius: 0;
    outline-radius: 0;
  }

  // entry error and warning style
  @each $e_type, $e_color in (error, $error_color),
                             (warning, $warning_color) {
    &.#{$e_type} {
      @include entry(normal, $e_color);
      &:focus { @include entry(focus, $e_color); }
      &:insensitive { @include entry(insensitive, $e_color); }
      &.flat {
        @include entry(flat-normal, $e_color);
        &:focus { @include entry(flat-focus, $e_color); }
        &:insensitive { @include entry(flat-insensitive, $e_color); }
      }
    }
  }

  &.image { // entry icons colors
    &:not(:hover):not(:active) { color: gtkalpha(currentColor, 0.75); }
    &:active { color: $selected_bg_color; }
    &:insensitive { color: gtkalpha(currentColor, 0.6); }
  }

  GtkTreeView & { // reset styling inside tree-view
    &.flat:focus {
      padding: 1px;
      border-radius: 0;
      border-image: none;
      background-color: $base_color;
      color: $fg_color;
      box-shadow: none;
      transition: none;
      &:selected { @extend %selected_items; }
    }
    &:insensitive,
    &.flat:insensitive { color: $insensitive_fg_color; }
  }

  .osd & {
  }
}


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

// stuff for .needs-attention
@keyframes needs_attention {
  from {
    background-image: -gtk-gradient(radial,
                                    center center, 0,
                                    center center, 0.001,
                                    to($selected_bg_color),
                                    to(transparent));
  }
  to {
    background-image: -gtk-gradient(radial,
                                    center center, 0,
                                    center center, 0.5,
                                    to($selected_bg_color),
                                    to(transparent));
  }
}

.button {
  padding: 0.7em 1em 0.8em;
  border-radius: 2px;
  background-repeat: no-repeat;
  background-position: center, center;
  background-size: 3em * 2 / 0.8 3em * 2 / 0.8, auto;
  font-weight: 500;
  @include button(normal);
  &:hover { @include button(hover); }
  &:active { @include button(active); }
  &:insensitive { @include button(insensitive); }
  &:checked { @include button(checked); }
  &:checked:insensitive { @include button(checked-insensitive); }

  &.flat {
    @include button(flat-normal);
    &:hover { @include button(flat-hover); }
    &:active { @include button(flat-active); }
    &:insensitive { @include button(flat-insensitive); }
    &:checked { @include button(flat-checked); }
    &:checked:insensitive { @include button(flat-checked-insensitive); }
    .linked > & {
      border-radius: 2px;
      &.image-button {
        outline-radius: 100px;
        border-radius: 100px;
      }
    }
  }

  // big standalone buttons like in Documents pager
  &.osd {
    &.image-button {
      @extend .button.flat;
      @extend %image_button;
      padding: 1.3em;
      background-color: $inverted_dark_color;
      &:not(:active):not(:insensitive):not(hover) {
        color: $secondary_accent_color;
      }
      &:hover {
        color: $accent_color;
        background-color: gtkopacity($inverted_dark_color, 0.7);
        background-image: linear-gradient(to bottom, $track_color);
      }
      &:active {
        color: $accent_color;
        background-color: gtkopacity($inverted_dark_color, 0.7);
        background-image: linear-gradient(to bottom, $accent_fill_color);
      }
    }
    &:insensitive { opacity: 0; }
  }

  // overlay / OSD style
  .osd & {
  }

  // Suggested and Destructive Action buttons
  @each $b_type, $b_color in (suggested-action, $suggested_color),
                             (destructive-action, $destructive_color) {
    &.#{$b_type} {
      background-color: $b_color;
      color: $secondary_selected_fg_color;
      &:hover {
        @include button(hover);
        background-color: $b_color;
        color: $selected_fg_color;
      }
      &:active {
        @include button(active);
        background-color: $selected_bg_color;
        color: $selected_fg_color;
      }
      &:checked { background-color: mix($selected_fg_color, $b_color, 20%); }
      &:insensitive {
        @include button(insensitive, $b_color,
                                     $insensitive_selected_fg_color);
      }

      &.flat {
        background-color: transparent;
        color: $b_color;
        &:hover { @include button(flat-hover, $track_color, $b_color);
        }
        &:active {
          @include button(flat-active);
          background-color: gtkalpha($selected_bg_color, 0.2);
          color: $selected_bg_color;
        }
        &:checked { @include button(flat-checked, $b_color, $selected_fg_color); }
        &:insensitive {
          @include button(flat-insensitive, $b_color,
                                            $insensitive_selected_fg_color);
        }
      }
    }
  }

  &.image-button { @extend %image_button; }

  &.text-button {
    padding-left: 1.2em;
    padding-right: 1.2em;
    font-weight: 700;
  }

  &.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: 0.7em 1em 0.8em; // same as .button
    outline-radius: 2px;
    border-radius: 2px;
    background-size: 3em * 2 / 0.8 3em * 2 / 0.8, auto;
    .label:first-child { padding-left: 0.5em; }
    .label:last-child { padding-right: 0.5em; }
  }

  .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: -0.2em; // needs to be set or it gets overriden 
                            // by GtkRadioButton outline-offset

    > .label {
      padding-left: 0.5em;  // label padding
      padding-right: 0.5em; //
    }

    > GtkImage {
      padding-left: 0.5em;   // image padding
      padding-right: 0.5em;  //
      padding-top: 0.2em;    //
      padding-bottom: 0.2em; //
    }

    &.text-button {
      padding: 0.7em 1em 0.8em; // needed or it will get overridden
    }

    &.image-button {
      // we want image buttons to have a 1:1 aspect ratio, so compensation
      // of the padding added to the GtkImage is needed
      padding: 0.5em 0.3em;
    }

    &.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;
    }
  }

  // inline-toolbar buttons
  .inline-toolbar &,
  .action-bar &,
  .inline-toolbar .linked > &,
  .action-bar .linked > & {
    &, &:not(.text-button).image-button {
      @extend .button.flat;
      padding: 0.75em;
      border-radius: 100px;
      outline-radius: 100px;
    }

    &.text-button {
      border-radius: 2px;
      outline-radius: 2px;
    }
  }

  .inline-toolbar .stack-switcher > &,
  .action-bar .stack-switcher > & {
    &, &:not(.text-button).image-button {
      @extend .button.flat;
      padding: 0.5em 0.25em;
      border-radius: 100px;
      outline-radius: 100px;
    }
  }

  .primary-toolbar & { icon-shadow: none; } // tango icons don't need shadows

  // mimic tab-switcher-ish button array
  // horizontal array
  .linked > &:not(.flat):not(:only-child) { @extend %linked_middle; }
  .linked > &,
  .linked > & .image-button,
  .linked > & .text-button {
    @extend %linked_middle;
    @extend %button_array;
  }
  // vertical array
  .linked.vertical > &:not(:only-child) { @extend %linked_vertical_middle; }
  .linked.vertical > &,
  .linked.vertical > & .image-button,
  .linked.vertical > & .text-button {
    @extend %linked_vertical_middle;
    @extend %button_vertical_array;
  }
}

%button_array {
  @include button(flat-normal);
  border-radius: 0;
  outline-radius: 0;
  color: $secondary_fg_color;
  border-image: -gtk-gradient(radial,
                              center bottom, 0,
                              center bottom, 0.5,
                              to($track_color),
                              to(transparent))
                              0 0 1 / 0 0 1px;
  &:hover {
    @include button(flat-hover);
    border-radius: 0;
    border-image: -gtk-gradient(radial,
                                center bottom, 0,
                                center bottom, 0.5,
                                to($track_color),
                                to(transparent))
                                0 0 2 / 0 0 2px;
  }
  &:active,
  &:checked {
    @include button(flat-checked);
    border-radius: 0;
    color: $fg_color;
    background-color: transparent;
    border-image: -gtk-gradient(radial,
                                center bottom, 0,
                                center bottom, 0.5,
                                to($selected_bg_color),
                                to(transparent))
                                0 0 2 / 0 0 2px;
    &:hover { background-color: gtkalpha($secondary_fg_color, 0.1); }
    &:insensitive {
      @include button(flat-checked-insensitive);
      color: $insensitive_fg_color;
      background-color: transparent;
      border-image: -gtk-gradient(radial,
                                  center bottom, 0,
                                  center bottom, 0.5,
                                  to(gtkopacity($selected_bg_color, 0.2)),
                                  to(transparent))
                                  0 0 2 / 0 0 2px;
      > .label { color: inherit; }
    }
  }
  &:insensitive {
    @include button(flat-insensitive);
    border-radius: 0;
    color: $insensitive_fg_color;
    background-color: transparent;
    border-image: -gtk-gradient(radial,
                                center bottom, 0,
                                center bottom, 0.5,
                                to($track_color),
                                to(transparent))
                                0 0 1 / 0 0 1px;
  }
}

%button_vertical_array {
  @include button(flat-normal);
  border-image: none;
  border-width: 0;
  outline-radius: 0;
  color: $secondary_fg_color;
  &:hover {
    @include button(flat-hover);
    &:dir(ltr) { box-shadow: inset 2px 0 $track_color; }
    &:dir(rtl) { box-shadow: inset -2px 0 $track_color; }
  }
  &:active,
  &:checked {
    @include button(flat-checked);
    color: $fg_color;
    background-color: transparent;
    &:dir(ltr) { box-shadow: inset 2px 0 $selected_bg_color; }
    &:dir(rtl) { box-shadow: inset -2px 0 $selected_bg_color; }
    &:hover { background-color: gtkalpha(currentColor, 0.1); }
    &:insensitive {
      @include button(flat-checked-insensitive);
      color: $insensitive_fg_color;
      background-color: transparent;
      &:dir(ltr) { box-shadow: inset 2px 0 gtkopacity($selected_bg_color, 0.2); }
      &:dir(ltr) { box-shadow: inset -2px 0 gtkopacity($selected_bg_color, 0.2); }
      > .label { color: inherit; }
    }
  }
  &:insensitive {
    @include button(flat-insensitive);
    color: $insensitive_fg_color;
    background-color: transparent;
    &:dir(ltr) { box-shadow: inset 1px 0 $track_color; }
    &:dir(rtl) { box-shadow: inset -1px 0 $track_color; }
  }

  &:dir(ltr) { box-shadow: inset 1px 0 $track_color; }
  &:dir(rtl) { box-shadow: inset -1px 0 $track_color; }
}

%image_button {
  padding: 1em;
  outline-radius: 100px;
  border-radius: 100px;
  background-size: 3em * 1 / 0.8 3em * 1 / 0.8, auto;
}

%needs_attention {
  background-repeat: no-repeat;
  background-position: right 3px;
  background-size: 0.4em 0.4em;
  animation: needs_attention 0.2s cubic-bezier(0.4, 0, 0.2, 1) forwards;
  transition: none;

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

// 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...
  outline-radius: 100px;
  border-radius: 100px;
}

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

%linked_middle { border-radius: 0; }

%linked {
  outline-radius: 2px;
  @extend %linked_middle;
  &:first-child {
    border-top-left-radius: 2px;
    border-bottom-left-radius: 2px;
  }
  &:last-child {
    border-top-right-radius: 2px;
    border-bottom-right-radius: 2px;
  }
  &:only-child { border-radius: 2px; }
}

%linked_vertical_middle { border-radius: 0; }

%linked_vertical{
  outline-radius: 2px;
  @extend %linked_vertical_middle;
  &:first-child {
    border-top-left-radius: 2px;
    border-top-right-radius: 2px;
  }
  &:last-child {
    border-bottom-left-radius: 2px;
    border-bottom-right-radius: 2px;
  }
  &:only-child { border-radius: 2px; }
}

// menu buttons
.menuitem.button.flat {
  transition: none;
  &:selected { @extend %selected_items; }
}

GtkColorButton.button {
  padding: 0.4em 0.6em 0.5em; // Uniform padding on the GtkColorButton

  GtkColorSwatch:first-child:last-child { // :first-child:last-child for a 
                                          // specificity bump, it gets 
                                          // overridden by the
                                          // colorpicker style, otherwise
    border-radius: 2px;
    box-shadow: $z-depth-1;
  }

  &,
  GtkColorSwatch {
    &:insensitive {
      box-shadow: none;
      opacity: 0.4;
    }
  }
}

// button box is always shown with flat-buttons
GtkButtonBox > .button {
  @include button(flat-normal);
  color: $secondary_accent_color;
  font-weight: 700;
  &:hover {
    @include button(flat-hover);
    color: $accent_color;
  }
  &:active {
    @include button(flat-active);
    color: $accent_color;
  }
  &:insensitive { @include button(flat-insensitive); }
  &:checked {
    @include button(flat-checked);
    color: $accent_color;
  }
  &:checked:insensitive {
    @include button(flat-checked-insensitive);
    color: gtkopacity($accent_color, 0.4);
  }
}


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

*:link {
  color: $link_color;
  &:hover, &:active { color: $link_color; }
  &:visited {
    color: $link_visited_color;
    &:hover, &:active { color: $link_visited_color; }
    *:selected & { color: mix($selected_fg_color, $selected_bg_color, 60%); }
  }
  &:selected,
  *:selected & {
    color: mix($selected_fg_color, $selected_bg_color, 80%);
  }
  &:insensitive { opacity: 0.4; }
}

.button:link,
.button:visited {
  @extend *:link;
  & > .label { text-decoration-line: underline; }
}


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

.spinbutton {
  .button,
  .osd & .button {
    padding: 0.4em;
    border: solid 0.35em transparent;
    border-radius: 100px;
    outline-radius: 100px;
    background: none;
    box-shadow: none;
    color: $secondary_fg_color;
    &:not(:last-child) { // '-' button
      &:hover {
        @include button(flat-hover);
        background: none;
        color: $error_color;
      }
      &:active {
        @include button(flat-active);
        background-color: $track_color;
        color: $error_color;
      }
      &:insensitive {
        @include button(flat-insensitive);
        background: none;
        color: $insensitive_fg_color;
      }
    }
    &:last-child { // '+' button
      &:hover {
        @include button(flat-hover);
        background: none;
        color: $success_color;
      }
      &:active {
        @include button(flat-active);
        background-color: $track_color;
        color: $success_color;
      }
      &:insensitive {
        @include button(flat-insensitive);
        background: none;
        color: $insensitive_fg_color;
      }
    }
  }

  &.vertical { // FIXME: try using linking templates for
               // vertically linked stuff
    padding: 0.5em 0;

    .button {
      padding: 0.2em 0;
      border: solid 0.5em transparent;
      border-radius: 200px;
      outline-radius: 200px;
      background: none;
      box-shadow: none;
      color: $secondary_fg_color;
      &:first-child { // '+' button
        &:hover {
          @include button(flat-hover);
          background: none;
          color: $success_color;
	}
        &:active {
          @include button(flat-active);
          background-color: $track_color;
          color: $success_color;
        }
        &:insensitive {
          @include button(flat-insensitive);
          background: none;
          color: $insensitive_fg_color;
        }
      }
      &:last-child { // '-' button
        &:hover {
          @include button(flat-hover);
          background: none;
          color: $error_color;
	}
        &:active {
          @include button(flat-active);
          background-color: $track_color;
          color: $error_color;
        }
        &:insensitive {
          @include button(flat-insensitive);
          background: none;
          color: $insensitive_fg_color;
        }
      }
    }

    &.entry {
    }
  }

  GtkTreeView & { // reset styling inside tree-view
    &.entry:focus {
      padding: 1px;
      border-radius: 0;
      border-width: 0;
      background-color: $base_color;
      color: $fg_color;
      box-shadow: none;
      &:selected { @extend %selected_items; }
    }
  }
}


/**************
 * ComboBoxes *
 **************/

GtkComboBox {
  > .the-button-in-the-combobox {
    // Otherwise combos are bigger than buttons
    padding: 0.35em 0.5em 0.45em;
  }

  -GtkComboBox-arrow-scaling: 0.5;
  -GtkComboBox-shadow-type: none;

  .menu { padding: 2px 0; }
  .menu .menuitem { padding: 0.35em 0.5em 0.45em; }

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

  .button { // combobox-button styling
    @extend %button_array;
    border-radius: 0;
    padding: 0.5em 0.5em 0.55em;  // FIXME: need a bit more padding
    color: $secondary_fg_color;
    &:hover,
    &:active,
    &:checked {
      @include button(flat-normal);
      @extend %button_array:active;
      background-color: transparent;
      &:insensitive {
        color: $insensitive_fg_color;
      }
    }
    &:insensitive {
      color: $insensitive_fg_color;
      background-color: transparent;
    }
  }

  &.combobox-entry {
    padding: 0;

    .entry {
    }

    .button { padding: 0 0.7em; }
  }
}

.linked.vertical > GtkComboBox {
  .button { // vertical combobox-button styling
    @extend %button_vertical_array;
    padding: 0.35em 0.5em 0.45em;
    border-radius: 0;
    color: $secondary_fg_color;
  }
}

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

// stop using rounded-borders
.linked > GtkComboBox:first-child > .the-button-in-the-combobox,
.linked > GtkComboBoxText:first-child > .the-button-in-the-combobox,
.linked > GtkComboBox:last-child > .the-button-in-the-combobox,
.linked > GtkComboBoxText:last-child > .the-button-in-the-combobox,
.linked > GtkComboBox:only-child > .the-button-in-the-combobox,
.linked > GtkComboBoxText:only-child > .the-button-in-the-combobox {
  @extend %linked_middle;
}
.linked.vertical > GtkComboBoxText > .the-button-in-the-combobox,
.linked.vertical > GtkComboBox > .the-button-in-the-combobox,
.linked.vertical > GtkComboBoxText:first-child > .the-button-in-the-combobox,
.linked.vertical > GtkComboBox:first-child > .the-button-in-the-combobox,
.linked.vertical > GtkComboBoxText:last-child > .the-button-in-the-combobox,
.linked.vertical > GtkComboBox:last-child > .the-button-in-the-combobox,
.linked.vertical > GtkComboBoxText:only-child > .the-button-in-the-combobox,
.linked.vertical > GtkComboBox:only-child > .the-button-in-the-combobox {
  @extend %linked_vertical_middle;
}


/************
 * Toolbars *
 ************/

.toolbar {
  -GtkWidget-window-dragging: true;

  padding: 0.4em;
  border-width: 0;
  background-color: $bg_color;
  color: $secondary_fg_color;
  // draw shadows
  box-shadow: if($variant == 'light', $toolbar-shadow-light,
                                      $toolbar-shadow-dark);
  &.vertical,
  .inline-toolbar &,
  GtkPaned &,
  GtkEventBox &,
  GtkGrid &.primary-toolbar { // stop drawing fake-shadows
    box-shadow: none;
  }

  .osd &, &.osd {
    padding: 3px;
    border-style: solid;
    border-width: 9px;
    border-image: -gtk-scaled(url("assets/osd-shadow#{$asset_suffix}.png"),
                              url("assets/osd-shadow#{$asset_suffix}@2.png"))
                  10 / 10px stretch;
    border-radius: 2px;
    box-shadow: none;
    color: $inverted_fg_color;
    background-color: $inverted_dark_color;
    &:backdrop {
      border-image: -gtk-scaled(url("assets/osd-shadow-backdrop#{$asset_suffix}.png"),
                                url("assets/osd-shadow-backdrop#{$asset_suffix}@2.png"))
                    10 / 10px stretch;
    }

    .button {
      @extend .button.flat;
      &:not(:active):not(:insensitive):not(hover) {
        color: $secondary_accent_color;
      }
      &:hover,
      &:active { color: $accent_color; }
      &:active,
      &:checked {
        border-image: none;
        box-shadow: none;
      }
      &:insensitive { color: gtkopacity($accent_color, 0.4); }
    }

    .label { padding: 0 1em; }
  }

  .button { // use flat-buttons
    @extend .button.flat;
    border-image: -gtk-gradient(radial,
                                center bottom, 0,
                                center bottom, 0.001,
                                to($track_color),
                                to(transparent))
                                0 0 0 / 0 0 0px;
    color: $secondary_fg_color;
    box-shadow: none;
    &:hover {
      border-image: none;
      color: $fg_color;
      box-shadow: none;
    }
    &:checked {
      border-image: -gtk-gradient(radial,
                                  center bottom, 0,
                                  center bottom, 0.5,
                                  to($selected_bg_color),
                                  to(transparent))
                                  0 0 2 / 0 0 2px;
      background: transparent;
      color: $fg_color;
      box-shadow: none;
      &:insensitive {
        border-image: none;
        background: transparent;
        color: $insensitive_fg_color;
        box-shadow: none;
        > .label { color: inherit; }
      }
    }
    &:insensitive {
      border-image: none;
      background-color: transparent;
      color: $insensitive_secondary_fg_color;
      box-shadow: none;
    }

    .image-button {
      border-radius: 100px;
      outline-radius: 100px;
    }
  }

  & .linked > .button {
    border-radius: 100px;
    outline-radius: 100px;
    &:hover { background-color: transparent; } // remove double-background
    &:not(:checked) {
      border-radius: 100px;
      outline-radius: 100px;
    }
  }
  & .linked > .button.text-button:not(.image-button) { // revive underlines
    @extend %button_array;
  }
}

// searchbar, location-bar & inline-toolbar
.inline-toolbar {
  padding: 0.4em;
  border-style: solid;
  border-width: 0 1px 1px;
  border-color: $borders_color;
  background-color: $secondary_dark_color;
  box-shadow: if($variant == 'light', $inline-shadow-light,
                                      $inline-shadow-dark);
}

.search-bar,
.location-bar {
  padding: 0.4em;
  border-style: solid;
  border-width: 0 0 1px;
  border-color: $borders_color;
  background-color: $secondary_dark_color;

  // use flat circle-button for '+', 'x', etc...
  .button.raised {
    padding: 0.75em;
    border-radius: 100px;
    outline-radius: 100px;
  }
}


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

.titlebar,
.header-bar {
  @extend %fade_effect;

  -GtkPaned-handle-size: 0; // FIXME: workaround for ugly Gedit!

  padding: 0.4em;
  border-width: 1px 0 1px;
  border-style: solid;
  // do not use transparentize
  border-top-color: $top_edge_border_color;
  border-bottom-color: $solid_dark_borders_color;
  background-color: $inverted_dark_color;
  background-clip: border-box;

  // basic text colours
  color: $inverted_secondary_fg_color;
  .label { // FIXME: only for insensitive state!
    &:checked {
      &:insensitive { color: $insensitive_inverted_fg_color; }
    }
    &:insensitive { color: $insensitive_inverted_secondary_fg_color; }
  }

  // titles
  .title {
    padding-left: 1em;
    padding-right: 1em;
    color: $inverted_fg_color;
    font-weight: 700;
    &:backdrop { @extend .dim-label; }
  }

  .subtitle {
    @extend .dim-label;
    padding-left: 1em;
    padding-right: 1em;
    color: $inverted_secondary_fg_color;
    font-size: 90%;
    &:backdrop { @extend .dim-label; }
  }

  // separator
  .header-bar-separator,
  & > GtkBox > .separator.vertical,
  & > GtkBox > GtkBox > .separator.vertical {
    -GtkWidget-separator-width: 0;
    border: 0 none transparent;
    color: transparent;
  }

  // button styling
  .button:not(.suggested-action):not(.destructive-action) {
    @extend .button.flat;
    border-image: -gtk-gradient(radial,
                                center bottom, 0,
                                center bottom, 0.001,
                                to($track_color),
                                to(transparent))
                                0 0 0 / 0 0 0px;
    color: $inverted_secondary_fg_color;
    &:hover { color: $inverted_fg_color; }
    &:checked {
      border-image: -gtk-gradient(radial,
                                  center bottom, 0,
                                  center bottom, 0.5,
                                  to($selected_bg_color),
                                  to(transparent))
                                  0 0 2 / 0 0 2px;
      background-color: transparent;
      color: $inverted_fg_color;
      // &:active { transition: none; }
      &:insensitive {
        background-color: transparent;
        color: $insensitive_inverted_fg_color;
        > .label { color: inherit; }
      }
    }
    &:insensitive { color: $insensitive_inverted_secondary_fg_color; }
  }

  .button,
  .linked > .button,
  .button.suggested-action,
  .button.destructive-action {
    &, & .label.text-button {
      color: $inverted_secondary_fg_color;
      &:hover { color: $inverted_fg_color; }
      &:checked {
        color: $inverted_fg_color;
        &:insensitive { color: $insensitive_inverted_fg_color; }
      }
      &:insensitive { color: $insensitive_inverted_secondary_fg_color; }
    }

    .label.text-button { // workaround for Gnome-Software
      border-image: none;
      box-shadow: none;
    }
  }

  // force to draw circle flat buttons as default
  .button:not(.suggested-action):not(.destructive-action) {
    border-radius: 100px;
    outline-radius: 100px;
    &.text-button {
      border-radius: 2px;
      outline-radius: 2px;
      &.image-button {
        border-radius: 2px;
        outline-radius: 2px;
      }
    }
  }

  // entry styling
  .entry,
  .linked > .entry {
    color: $inverted_secondary_fg_color;
    &:focus { color: $inverted_fg_color; }
    &:insensitive { color: $insensitive_inverted_secondary_fg_color; }
  }

  // combobox styling
  GtkComboBox,
  .linked > GtkComboBox {
    &.combobox-entry {
      .entry {
        color: $inverted_secondary_fg_color;
        &:focus { color: $inverted_fg_color; }
        &:insensitive { color: $insensitive_inverted_secondary_fg_color; }
      }

      .button {
        color: $inverted_secondary_fg_color;
        &:hover { color: $inverted_fg_color; }
        &:checked {
          color: $inverted_fg_color;
          &:insensitive { color: $insensitive_inverted_fg_color; }
        }
        &:insensitive { color: $insensitive_inverted_secondary_fg_color; }
      }
    }
  }

  // menu styling
  .menu .menuitem { // reset text colour
    color: $secondary_fg_color;
    &:hover { color: $fg_color; }

    .label {
      &:insensitive { color: $insensitive_fg_color; }
    }

    .accelerator { color: gtkalpha(currentColor, 0.6); }

    .separator { color: $borders_color; }
  }

  // pop-over styling
  .popover .button.flat {
    color: $secondary_fg_color;
    &:hover { color: $fg_color; }

    .label {
      &:hover { color: $fg_color; }
      &:insensitive { color: $insensitive_fg_color; }
    }
  }

  // switch styling
  GtkSwitch {
    &.trough {
      background-color: gtkopacity($inverted_secondary_fg_color, 0.1);
      &:active {
        background-color: gtkopacity($selected_bg_color, 0.2);
        &:insensitive { background-color: gtkopacity($selected_bg_color, 0.2); }
      }
      &:insensitive {
        color: $insensitive_inverted_fg_color;
        background-color: $track_color;
      }
    }

    &.slider {
      background-color: $inverted_bg_color;
      &:hover {
        background-image: linear-gradient(to bottom,
                                          gtkalpha($selected_fg_color, 0.2));
      }
      &:active {
        background-color: $selected_bg_color;
        &:insensitive { background-color: #3F4E56; }
      }
      &:insensitive { background-color: #3F4E56; }
    }
  }


  // selection-mode styling
  &.selection-mode {
    border-width: 1px 0 1px 0; // remove side borders
    border-top-color: $highlight_color;
    border-bottom-color: transparent;
    background-color: $selected_bg_color;
    color: $selected_fg_color;

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

    .button,
    .button.text-button,
    .flat.selection-menu,
    .text-button.selection-menu,
    .button.image-button {
      border-image: -gtk-gradient(radial,
                                  center bottom, 0,
                                  center bottom, 0.001,
                                  to($selected_fg_color),
                                  to(transparent))
                                  0 0 0 / 0 0 0px;
      color: $secondary_selected_fg_color;
      background-color: transparent;
      &:hover,
      &:active,
      &:checked { color: $selected_fg_color; }
      &:insensitive { color: $insensitive_inverted_secondary_fg_color; }
      &:checked {
        border-image: -gtk-gradient(radial,
                                    center bottom, 0,
                                    center bottom, 0.5,
                                    to($selected_fg_color),
                                    to(transparent))
                                    0 0 2 / 0 0 2px;
        color: $selected_fg_color;
        background-color: transparent;
        &:insensitive {
          color: $insensitive_selected_fg_color;
          > .label { color: inherit; }
        }
      }

      &.suggested-action {
        // NOTE: do not use @extend .button;
        @include button(normal);
        &:hover { @include button(hover); }
        &:active { @include button(active); }
        &:insensitive { @include button(insensitive); }
      }
    }

    .button:not(.suggested-action):not(.destructive-action) {
      border-radius: 100px;
      outline-radius: 100px;
      &.text-button,
      &.flat.selection-menu {
        border-radius: 2px;
        outline-radius: 2px;
        &.image-button {
          border-radius: 100px;
          outline-radius: 100px;
        }
      }
    }

    .entry {
      color: $inverted_secondary_fg_color;
      &:focus { color: $inverted_fg_color; }
      &:insensitive { color: $insensitive_inverted_secondary_fg_color; }
    }

    .selection-menu {
      padding-left: 1.2em;
      padding-right: 1.2em;

      GtkArrow { -GtkArrow-arrow-scaling: 1; }

      .arrow { -gtk-icon-source: -gtk-icontheme('pan-down-symbolic'); }
    }
  }

  // misc
  .tiled &  {
    @extend %tiled_integration;
    transition: none;
  }
  .maximized & {
    @extend %maxd_integration;
    transition: none;
  }

  &.default-decoration { // FIXME: do not use scalable units
    padding: 5.3px;
    border-width: 0;

    .title { // fade_effect doesn't work
      color: $inverted_fg_color;
      &:backdrop { color: gtkopacity($inverted_fg_color, 0.4); }
    }

    .button.titlebutton {
      padding: 4px;
      color: $inverted_secondary_fg_color;
      &:hover,
      &:active { color: $inverted_fg_color; }
      &:backdrop { color: gtkopacity($inverted_fg_color, 0.4); }
    }
  }
}

.header-bar { // draw hilight and shadows
  .csd &,
  GtkBox &:only-child {
    box-shadow: if($variant == 'light', $header-shadow-light,
                                        $header-shadow-dark);

    .tiled &  { @extend %tiled_integration; }
    .maximized & { @extend %maxd_integration; }
  }

  // override unwanted side-borders
  GtkBox &:not(:only-child):first-child,
  GtkBox &:not(:only-child):last-child {
    border-left-color: $inverted_dark_color;
    border-right-color: $inverted_dark_color;

    .tiled &,
    .maximized & {
      border-left-color: $panel_bg_color;
      border-right-color: $panel_bg_color;
    }
  }

  // Remove unneeded side shadows with dirty hacks
  GtkBox &:not(:only-child):last-child {
    &:dir(ltr) {
      box-shadow: if($variant == 'light', $sub-header-shadow-light-ltr,
                                          $sub-header-shadow-dark-ltr);

      .tiled &  { @extend %tiled_integration; }
      .maximized & { @extend %maxd_integration; }
    }
    &:dir(rtl) {
      box-shadow: if($variant == 'light', $sub-header-shadow-light-rtl,
                                          $sub-header-shadow-dark-rtl);

      .tiled &  { @extend %tiled_integration; }
      .maximized & { @extend %maxd_integration; }
    }
  }

  // draw paned-separator with border
  GtkPaned &:not(:only-child):last-child {
    &:dir(ltr) {
      border-left: 1px solid $solid_dark_borders_color;

      .tiled &  { @extend %tiled_integration; }
      .maximized & { @extend %maxd_integration; }
    }
    &:dir(rtl) {
      border-right: 1px solid $solid_dark_borders_color;

      .tiled &  { @extend %tiled_integration; }
      .maximized & { @extend %maxd_integration; }
    }
  }
}

.header-bar.selection-mode { // selection-mode specific
  GtkBox & { // Remove unneeded side shadows with dirty hacks
    &:not(:only-child):last-child {
      &:dir(ltr) {
        box-shadow: if($variant == 'light', $selected-header-shadow-light-ltr,
                                            $selected-header-shadow-dark-ltr);

        .tiled &  { @extend %tiled_integration; }
        .maximized & { @extend %maxd_integration; }
      }
      &:dir(rtl) {
        box-shadow: if($variant == 'light', $selected-header-shadow-light-rtl,
                                            $selected-header-shadow-dark-rtl);

        .tiled &  { @extend %tiled_integration; }
        .maximized & { @extend %maxd_integration; }
      }
    }
  }
}

.header-bar,
.titlebar { // set rounded corners
  border-top-left-radius: 2px;
  border-top-right-radius: 2px;

  GtkBox &:not(:last-child):not(.titlebar) {
    &:dir(ltr) {
      border-top-left-radius: 2px;
      border-top-right-radius: 0;
    }
    &:dir(rtl) {
      border-top-left-radius: 0;
      border-top-right-radius: 2px;
    }
  }

  GtkBox &:last-child:not(.titlebar) {
    &:dir(ltr) { border-top-left-radius: 0; }
    &:dir(rtl) { border-top-right-radius: 0; }
  }
}

// squared corners when the window is max'd or tiled
%tiled_integration {
  border-radius: 0;
  border-color: $panel_bg_color;
  border-width: 2px 0 0 0;
  border-top-color: $secondary_selected_bg_color;
  background-color: $panel_bg_color;
  box-shadow: none;
  &:backdrop { border-top-color: $track_color; }
}

%maxd_integration {
  border-radius: 0;
  border-color: $panel_bg_color;
  border-width: 1px 0 0 0;
  background-color: $panel_bg_color;
  box-shadow: none;
}


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

.path-bar .button {
  padding: 0.3em 0.7em 0.4em;

  &.image-button { padding: 0.7em; }

  &:only-child { padding: 0.3em 0.7em 0.4em; }

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

  GtkImage { padding-top: 1px; }
}


/**************
 * Tree Views *
 **************/

GtkTreeView.view {
  @at-root * {
    -GtkTreeView-horizontal-separator: 4;
    -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: $track_color;  // this is actually the tree lines color,
  border-top-color: $borders_color; // while this is the grid lines color,
                                    // better then nothing

  &.rubberband { @extend .rubberband; } // to avoid borders being overridden
                                        // by the previously set props

  border-radius: 0; // rest border radius in lists

  &:hover,
  &:selected { border-radius: 0; }

  // override foreground colours
  &, & .entry,
  & .entry > .label {
    color: $secondary_fg_color;
    &:hover,
    &:active,
    &:focus { color: $fg_color; }
    &:selected { color: $selected_fg_color; }
    &:insensitive {
      color: $insensitive_fg_color;
      &:selected { color: $insensitive_selected_fg_color; }
    }
  }

  .separator {
    &, &:hover { color: $borders_color; }
  }

  // clear backgrounds
  background-color: transparent;
  background-image: none;
  box-shadow: none;

  &.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'); }
    &:checked { -gtk-icon-source: -gtk-icontheme('pan-down-symbolic'); }
    &:selected {
      color: gtkopacity($selected_fg_color, 0.75);
      &:hover, &:active { color: $selected_fg_color; }
    }
  }

  &.progressbar { // progress bar in treeviews
    @extend %treeview_progressbar;
    border-color: $accent_color;
    &:selected { border-color: currentColor; }
  }

  &.trough { // progress bar trough in treeviews
    @extend %treeview_progressbar;
    border-color: gtkopacity($accent_color, 0.2);
    &:selected { border-color: $track_color; }
  }

  &, GtkPaned & { // redraw some stuff for RhythmBox
    background-color: $base_color;

    &:hover,
   .list-row:hover { color: $fg_color; }
    &:selected,
    .list-row:selected { @extend %selected_items; }
  }
}

column-header {
  .button {
    @extend .list-row.activatable;
    padding: 0.3em 0.4em 0.35em;
    border-style: none solid solid none;
    border-width: 1px;
    border-color: $borders_color;
    border-radius: 0;
    background-color: $base_color;
    color: $tertiary_fg_color;
    box-shadow: none;
    &:hover,
    &:active {
      color: $fg_color;
      box-shadow: none;
    }
    &:insensitive { background-color: $base_color; }
    &.dnd { @extend column-header.button.dnd; }
  }

  &:last-child .button,
  &:last-child.button { // treeview-like derived widgets
                        // in Banshee and Evolution
    border-right-style: none;
  }

  GtkPaned & { // redraw some stuff for RhythmBox
    .button {
      background-color: $base_color;
      // background-image: linear-gradient(to bottom, $bg_color);
      &:insensitive { background-color: $base_color; }
    }

    &:not(:first-child):not(:last-child) {
      &.button,
      & .button { border-style: none solid solid none; }
    }
    &, &:only-child,
    &:first-child,
    &:last-child {
      &.button,
      & .button { border-style: none none solid none; }
    }
  }
}

column-header.button.dnd { // for treeview-like derive widgets
  // transition: none;
  border-left-style: solid;
  color: $selected_bg_color;
}


/*********
 * Menus *
 *********/

.menubar {
  -GtkWidget-window-dragging: true;
  padding: 0;
  box-shadow: $menubar-shadow;
  background-color: $inverted_dark_color;
  color: $inverted_secondary_fg_color; // FIXME: Gtk+3 firefox needs this!

  & > .menuitem {
    padding: 0.4em 0.6em;
    color: $inverted_secondary_fg_color;
    &:hover { // Seems like it :hover even with keyboard focus
      color: $inverted_fg_color;
      box-shadow: inset 0 -2px $selected_bg_color;
    }
    &:insensitive {
      color: $insensitive_inverted_fg_color;
      box-shadow: none;
    }
  }

  .tiled &,
  .maximized & {
    background-color: $panel_bg_color;
    box-shadow: none;
  }
}

.menu {
  margin: 4px 0;
  padding: 4px 0;
  border-width: 1px; // adds borders in a non composited env
  border-style: solid;
  border-color: $base_color transparent transparent;
  background-color: $secondary_base_color;

  .csd & { // axes borders in a composited env
    border-width: 1px;
    border-radius: 2px;
    border-color: $base_color transparent transparent;
  }

  .menuitem {
    transition: none;
    padding: 0.4em 0.4em 0.5em;
    color: $secondary_fg_color;
    font: initial;
    text-shadow: none;
    &:hover {
      transition: none;
      color: $fg_color;
      background-color: gtkalpha(currentColor, 0.1);
    }
    &:insensitive { color: $insensitive_fg_color; }

    // submenu indicators
    &.arrow {
      -gtk-icon-source: -gtk-icontheme('pan-end-symbolic');
      &:insensitive { color: $insensitive_fg_color; }
    }
    &.arrow:dir(rtl) {-gtk-icon-source:-gtk-icontheme('pan-end-symbolic-rtl'); }
  }

  &.button { // overlow buttons
    border-style: none;
    border-radius: 0;
    background-color: $secondary_base_color;
    &:hover { background-color: $secondary_dark_color; }
    &:insensitive {
      color: transparent;
      background-color: transparent;
      border-color: transparent ;
    }

    &.top { border-bottom: 1px solid $borders_color; }
    &.bottom { border-top: 1px solid $borders_color; }
  }

  // use asymmetric separators
  GtkSeparatorMenuItem {
    &:dir(ltr) {
      padding-left: 2.4em;
      padding-right: 0;
    }
    &:dir(rtl) {
      padding-left: 0;
      padding-right: 2.4em;
    }
  }
}

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

  .separator { color: $borders_color; }
}

.csd.popup { border-radius: 2px; }


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

.popover {
  padding: 2px;
  border: 1px solid;
  border-color: $base_color $secondary_base_color $secondary_base_color;
  border-radius: 2px;
  background-color: $secondary_base_color;
  box-shadow:  $z-depth-3;
  &:backdrop { box-shadow: $z-depth-1; }

  > .list,
  > .view,
  > .toolbar,
  &.osd > .toolbar {
    border-style: none;
    border-image: none;
    background-color: transparent;
    transition: none;
  }

  .button.menuitem.flat,
  .button.flat {
    transition: none;
    background-color: transparent;
    background-size: 8em * 1 / 0.8 8em * 1 / 0.8, auto;
    color: $secondary_fg_color;
    font: initial;
    &:hover {
      background-color: transparent; // remove double-bg
      color: $fg_color;
    }

    // FIXME: label padding is ugly
    // vertical padding of GtkMenuItem * 0.5
    .label { padding: 0.2em 0 0.25em; }
  }

  .linked > .button {
    // @extend .button.flat;
    @include button(flat-normal);
    @extend %button_array;
    color: $secondary_fg_color;
    &:hover { @include button(flat-hover); }
    &:active { @include button(flat-active); }
    &:insensitive { @include button(flat-nsensitive); }
    &:checked {
      @include button(flat-checked);
      color: $fg_color;
      background-color: transparent;
    }
    &:checked:insensitive { @include button(flat-checked-insensitive); }
  }

  // hide trough in popover
  .scrollbar.trough {
    background-color: transparent;
    border: 1px none transparent;
  }

  &.osd { @extend %osd; }
}


/*****************
 * 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: $base_color;
  -GtkNotebook-initial-gap: 6;
  -GtkNotebook-arrow-spacing: 5;
  -GtkNotebook-tab-curvature: 0;
  -GtkNotebook-tab-overlap: 1;
  -GtkNotebook-has-tab-gap: false;
  -GtkWidget-focus-padding: 0;
  -GtkWidget-focus-line-width: 0;

  &.frame {
    border: 1px solid $borders_color;
    @each $_tab, $_border in (top, top),
                             (bottom, bottom),
                             (left, left),
                             (right, right) {
      &.#{$_tab} {
        border-#{$_border}-color: $base_color;
      }
    }
  }

  &.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: $bg_color;

    // this is the shading of the header behind the tabs
    &.frame { border: none; }

    @each $_header, $_border in (top, 0 -1px),
                                (bottom, 0 1px),
                                (left, -1px 0),
                                (right, 1px 0) {
      &.#{$_header} { box-shadow: inset #{$_border} $borders_color; }
    }
  }

  tab {
    outline-offset: 0;
    border-width: 0;
    border-style: solid;
    border-color: transparent;
    background-color: transparent;

    $tab_indicator_size: 2px;
    // vertical tab sizing
    $vt_vpadding: 0.5em;
    $vt_hpadding: 1.2em;
    // horizontal tab sizing
    $ht_vpadding: 0.5em;
    $ht_hpadding: 1.2em;

    // 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 {
      -GtkNotebook-tab-overlap: 1;
      &.top,
      &.bottom {
        padding-left: 1.2em;  // for a nicer close button
        padding-right: 1.2em; // placement
        border-left-width: 1px;
        border-right-width: 1px;
      }
      &.left,
      &.right {
        border-bottom-width: 1px;
        border-top-width: 1px;
      }
    }

    @each $_tab, $_border in (top, bottom),
                             (bottom, top),
                             (left, right),
                             (right, left) {
      &.#{$_tab} {
        // padding-#{$_border}: ($vt_vpadding -$tab_indicator_size);
        border-#{$_border}-width: $tab_indicator_size;
      }
    }

    // here's the interesting stuff
    &:hover,
    &.prelight-page { border-color: $track_color; }
    &:active,
    &.active-page { border-color: $selected_bg_color; }

    @each $_tab, $_border in (top, bottom),
                             (bottom, top),
                             (left, right),
                             (right, left) {
      &.reorderable-page.#{$_tab} {
        border-color: transparent;
        &:hover, &.prelight-page {
          border-color: $borders_color;
          border-#{$_border}-width: 1px;
          border-#{$_border}-color: $borders_color;
          background-color: $base_color;
          box-shadow: none;
        }
        &:active, &.active-page {
          border-color: $borders_color;
          border-#{$_border}-width: 2px;
          border-#{$_border}-color: $selected_bg_color;
          background-color: $base_color;
          box-shadow: if($variant == 'light', $tab-shadow-light,
                                              $tab-shadow-dark);
        }
      }
    }

    .label { // tab text
      // needed for a nicer focus ring
      // and to prevent unexpected offset on reorderable-page,
      // set same padding with .button > GtkImage
      padding: 0.5em;
      font-weight: 700;
      color: $tertiary_fg_color;
    }
    .prelight-page .label,
    .label.prelight-page { // hover tab text
      color: $fg_color;
    }
    .active-page .label,
    .label.active-page { // active tab text
      color: $fg_color;
    }

    .button { // tab close button
      @extend %image_button;
      padding: 0;
      background-size: 3em * 1 / 0.8 3em * 1 / 0.8, auto;
      @include button(flat-normal);
      color: $tertiary_fg_color;
      &:hover { @include button(flat-hover); }
      &:active { @include button(flat-active); }
      &:insensitive { @include button(flat-insensitive); }

      & > GtkImage { // this is a hack which makes tabs grow
        padding: 0.6em;
      }
    }
    .prelight-page .button,
    &:hover .button { // hover tab close button
      color: $fg_color;
    }
    .active-page .button,
    &:hover .button { // active tab close button
      color: $fg_color;
    }
  }

  &.arrow {
    color: $tertiary_fg_color;
    &:hover,
    &:active { color: $fg_color; }
    &:insensitive { color: $insensitive_secondary_fg_color; }
  }

  &:not(.reorderable-page) > .entry { @extend .entry.flat; }
}


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

@keyframes slow_down_ltr {
  to { margin-right: 0; }
}

@keyframes slow_down_rtl {
  to { margin-left: 0; }
}

@keyframes slow_down_horz {
  to { margin-top: 0; }
}

.scrollbar {
  -GtkRange-slider-width: 12;
  -GtkRange-trough-border: 0;
  -GtkScrollbar-has-backward-stepper: false;
  -GtkScrollbar-has-forward-stepper: false;
  -GtkScrollbar-min-slider-length: 32;
                                   // minimum size for the slider.
                                   // sadly can't be in '.slider'
                                   // where it belongs
  -GtkRange-stepper-spacing: 0;
  -GtkRange-trough-under-steppers: 1;

  .button { border: none; }

  &.overlay-indicator {
    &:not(.dragging):not(.hovering) { // Overlay scrolling indicator
      -GtkRange-slider-width: 10px; // actually 10 - 4 -> 6px slider

      .slider {
        margin: 0;
        border: none;
      }

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

      // w/o the following margin tweaks the slider shrinks when
      // hovering/dragging
      &.vertical .slider {
        margin-top: 0;
        margin-bottom: 0;
        &:dir(ltr) {
          margin-left: 0;
          margin-right: 6px;
        }
        &:dir(ltr) {
          margin-left: 6px;
          margin-right: 0;
        }
      }
      &.horizontal .slider {
        margin-top: 6px;
        margin-bottom: 0;
        margin-left: 0;
        margin-right: 0;
      }
    }

    &.dragging,
    &.hovering {
      .trough { background-color: gtkopacity($base_color, 0.55); }
    }

    &.hovering { // slow-down when deforming
      &.vertical .slider {
        &:dir(ltr) { animation: slow_down_ltr 0.2s linear forwards; }
        &:dir(rtl) { animation: slow_down_rtl 0.2s linear forwards; }
      }
      &.horizontal .slider { animation: slow_down_horz 0.2s linear forwards; }
    }
  }

  // trough coloring
  .trough {
    border: none;
    background-color: $base_color;
  }

  // slider coloring
  .slider {
    background-color: gtkopacity($tertiary_fg_color, 0.55);
    &:hover { background-color: gtkopacity($secondary_fg_color, 0.55); }
    &:active { background-color: $fg_color; }
    &:insensitive { opacity: 0.4; }
  }

  // sizing
  .slider {
    border-radius: 0;
    margin: 0;
  }

  &.fine-tune .slider { margin: 0; }

  &.vertical {
    .slider { margin: 0; }
    &.fine-tune .slider { margin: 0; }
  }

  &.horizontal {
    .slider { margin: 0; }
    &.fine-tune .slider { margin: 0; }
  }
}

.scrollbars-junction,
.scrollbars-junction.frame { // the small square between two scrollbars
  border: none;
  background-color: $base_color;
}


/**********
 * Switch *
 **********/

GtkSwitch {
  -GtkSwitch-slider-width: 20px; // 55px is the right value to make it as tall
                                 // as buttons, not doing that for now
  -GtkSwitch-slider-height: 20px;

  outline-offset: -4px;
  outline-radius: 100px;
  font-size: 0;

  &.trough {
    // similar to the .scale
    border: 8px solid transparent;
    border-radius: 100px;
    background-color: $track_color;
    &:active {
      background-color: gtkopacity($selected_bg_color, 0.2);
      &:insensitive { background-color: gtkopacity($selected_bg_color, 0.2); }
    }
    &:insensitive {
      color: $insensitive_fg_color;
      background-color: $track_color;
    }
  }

  &.slider {
    padding: 4px;
    border-radius: 100px;
    outline-radius: 100px;
    @include button(normal);
    &:hover {
      @include button(hover);
      background-image: linear-gradient(to bottom,
                                        gtkalpha($selected_fg_color, 0.2));
    }
    &:active {
      @include button(checked);
      &:hover { box-shadow: $z-depth-2; }
      &:insensitive {
        @include button(checked-insensitive);
        // do not use any transparentized materials
        background-color: if($variant == 'light', #F0F2F3, #3F4E56);
        background-image: none;
        box-shadow: none;
      }
    }
    &:insensitive {
      background-color: if($variant == 'light', #F0F2F3, #3F4E56);
      background-image: none;
      box-shadow: none;
    }
  }

  .list-row:selected & { // return to monochrome
    &.trough {
      background-color: $bg_color;
      &:active {
        background-color: $secondary_dark_color;
        &:insensitive { background-color: $secondary_dark_color; }
      }
    }

    &.slider {
      background-color: $bg_color;
      &:hover {
        background-image: linear-gradient(to bottom,
                                          gtkalpha($selected_fg_color, 0.2));
      }
      &:active {
        background-color: $base_color;
        &:hover { box-shadow: $z-depth-2; }
      }
    }
  }

  // special case inside the grid container,
  // need to protect geometry by using pixmaps images...
  GtkGrid & {
    -GtkSwitch-slider-width: 40;
    -GtkSwitch-slider-height: 20;
    font-size: 0;
    outline-color: transparent;

    &.trough,
    &.slider { // reset all of default switches
      &,
      &:hover,
      &:active,
      &:active:hover,
      &:active:insensitive,
      &:insensitive {
        padding: 0;
        border: 4px solid transparent;
        color: transparent;
        background: none;
        background-image: none;
        background-size: 40px 20px;
        background-repeat: no-repeat;
        background-position: right center;
        box-shadow: none;

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

    &.trough { // use ugly pixmaps
      background-image: -gtk-scaled(
                        url("assets/toggle-off#{$asset_suffix}.png"),
                        url("assets/toggle-off#{$asset_suffix}@2.png"));
      &:hover {
        background-image: -gtk-scaled(
                          url("assets/toggle-off-hover#{$asset_suffix}.png"),
                          url("assets/toggle-off-hover#{$asset_suffix}@2.png"));
      }
      &:active {
        background-image: -gtk-scaled(url("assets/toggle-on.png"),
                                      url("assets/toggle-on@2.png"));
        &:hover {
          background-image: -gtk-scaled(url("assets/toggle-on-hover.png"),
                                        url("assets/toggle-on-hover@2.png"));
        }
        &:insensitive {
          background-image: -gtk-scaled(
                            url("assets/toggle-on-insensitive#{$asset_suffix}.png"),
                            url("assets/toggle-on-insensitive#{$asset_suffix}@2.png"));
        }
      }
      &:insensitive {
        background-image: -gtk-scaled(
                          url("assets/toggle-off-insensitive#{$asset_suffix}.png"),
                          url("assets/toggle-off-insensitive#{$asset_suffix}@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'),
                  (':hover', '-unchecked-active'),
                  (':active', '-unchecked-active'),
                  (':insensitive','-unchecked-insensitive'),
                  (':inconsistent', '-mixed'),
                  (':inconsistent:hover', '-mixed-active'),
                  (':inconsistent:active', '-mixed-active'),
                  (':inconsistent:insensitive', '-mixed-insensitive'),
                  (':checked', '-checked'),
                  (':checked:hover', '-checked-active'),
                  (':checked:active', '-checked-active'),
                  (':checked:insensitive','-checked-insensitive') {
    .#{$w}#{$s} {
      -gtk-icon-source: -gtk-scaled(url("assets/#{$a}#{$as}#{$asset_suffix}.png"),
                                    url("assets/#{$a}#{$as}#{$asset_suffix}@2.png"));
      icon-shadow: none;
    }
  }

  // menu
  @each $s,$as in ('',''),
                  // (':active', '-checked'),
                  (':insensitive','-insensitive'),
                  (':inconsistent', '-mixed'),
                  // (':inconsistent:active', '-mixed'),
                  (':inconsistent:insensitive', '-mixed-insensitive'),
                  (':checked', '-checked'),
                  // (':checked:active', '-checked'),
                  (':checked:insensitive','-checked-insensitive') {
    .menu .menuitem.#{$w}#{$s} {
      -gtk-icon-source: -gtk-scaled(url("assets/#{$a}#{$as}-symbolic#{$asset_suffix}.png"),
                                    url("assets/#{$a}#{$as}-symbolic#{$asset_suffix}@2.png"));
      icon-shadow: none;
      &:hover {
        -gtk-icon-source: -gtk-scaled(url("assets/#{$a}#{$as}-symbolic#{$asset_suffix}.png"),
                                      url("assets/#{$a}#{$as}-symbolic#{$asset_suffix}@2.png"));
      }
    }
  }
}

// check/radio inside selected-rows
@each $w,$a in ('check', 'checkbox'),
               ('radio','radio') {

  // standard checks and radios
  @each $s,$as in ('','-unchecked'),
                  (':active', '-unchecked'),
                  (':inconsistent', '-mixed'),
                  (':inconsistent:active', '-mixed'),
                  (':checked', '-checked'),
                  (':checked:active', '-checked') {
    .view,
    .list-row,
    .list-row.activatable {
      .#{$w}:selected#{$s},
      .#{$w}:selected:focus#{$s} {
        -gtk-icon-source: -gtk-scaled(url("assets/#{$a}#{$as}-selected.png"),
                                      url("assets/#{$a}#{$as}-selected@2.png"));
        icon-shadow: none;
      }
      // use dark variant for insensitive states
      #{$w}:selected:insensitive,
      #{$w}:selected:focus:insensitive {
        -gtk-icon-source: -gtk-scaled(url("assets/#{$a}-unchecked-insensitive-dark.png"),
                                      url("assets/#{$a}-unchecked-insensitive-dark@2.png"));
      }
      #{$w}:selected:inconsistent:insensitive,
      #{$w}:selected:focus:inconsistent:insensitive {
        -gtk-icon-source: -gtk-scaled(url("assets/#{$a}-mixed-insensitive-dark.png"),
                                      url("assets/#{$a}-mixed-insensitive-dark@2.png"));
      }
      #{$w}:selected:checked:insensitive,
      #{$w}:selected:focus:checked:insensitive {
        -gtk-icon-source: -gtk-scaled(url("assets/#{$a}-checked-insensitive-dark.png"),
                                      url("assets/#{$a}-checked-insensitive-dark@2.png"));
      }
    }
  }
}

// selection-mode
@each $s,$as in ('','-selectionmode'),
                  (':hover', '-active-selectionmode'),
                  (':active', '-active-selectionmode'),
                  (':insensitive', '-insensitive-selectionmode'),
                  (':checked', '-checked-selectionmode'),
                  (':checked:hover', '-checked-active-selectionmode'),
                  (':checked:active', '-checked-active-selectionmode'),
                  (':insensitive:checked', '-checked-insensitive-selectionmode') {
  .view.content-view.check#{$s}:not(.list) {
    -gtk-icon-source: -gtk-scaled(url("assets/checkbox#{$as}#{$asset_suffix}.png"),
                                  url("assets/checkbox#{$as}#{$asset_suffix}@2.png"));
    background-color: transparent;
  }
}

GtkCheckButton.text-button,
GtkRadioButton.text-button {
  // this is for a nice focus on check and radios text
  padding: 0.2em 0.5em;
  outline-offset: 0;
  color: $secondary_fg_color;
  &:hover,
  &:active,
  &:checked { color: $fg_color; }
  &:insensitive,
  &:insensitive:active,
  &:insensitive:inconsistent {
    // set insensitive color, which is overriden otherwise
    color: $insensitive_fg_color;
  }
}


/************
 * GtkScale *
 ************/

.scale,
.scale.scale-has-marks-above.scale-has-marks-below,
.scale.vertical.scale-has-marks-above.scale-has-marks-below {
  // FIXME: rationalize
  -GtkScale-slider-length: 20;
  -GtkRange-slider-width: 20;
  -GtkRange-trough-border: 2;
  outline-offset: -8px;
  outline-radius: 100px;

  &.fine-tune {
    // outline-offset: -6px;
    &.slider { background-size: 80%; }
    &.trough {
      // margin: 8px;
      // border-radius: 100px;
    }
  }

  &.slider {
    &:not(:hover):not(:active) { background-size: 80%; }
      // @include entry(normal);
      // border-radius: 50%;
      // background-color: $accent_color;
      @each $s,$as in ('',''),
                  //  (':hover','-hover'),
                      (':active','-active'),
                      (':insensitive','-insensitive') {
        &.slider#{$s} {
          $_url: 'assets/slider#{$as}#{$asset_suffix}';
          border-style: none;
          border-radius: 0;
          background-color: transparent;
          background-image: -gtk-scaled(url('#{$_url}.png'),
                            url('#{$_url}@2.png'));
          background-repeat: no-repeat;
          background-position: center;
          box-shadow: none;
        }
      }
    &:hover {
      // @include entry(focus);
      // border-radius: 50%; // needed for double marks scales
    }
    &:insensitive {
      // @include entry(insensitive);
      // border-radius: 50%;  // overridden
    }

    // OSD sliders
    .osd & {
    }
  }

  &.trough {
    margin: 11px;
    border-radius: 0;
    background-color: $track_color;
    &.highlight {
      background-color: $accent_color;
      &:insensitive { background-color: $track_color; }
    }
    &:insensitive { color: $insensitive_fg_color; }

    // OSD troughs
    .osd & {
    }
  }
  // marks color
  &.separator { color: $track_color; }

  // scales on selected list rows
  .list-row:selected & {
  }
}

@each $d,$dn in ('', 'horz'),
                ('.vertical', 'vert') {
  @each $w,$we in  ('scale-has-marks-below','scale_marks_below'),
                   ('scale-has-marks-above','scale_marks_above') {
    .scale#{$d}.#{$w} {
      -GtkScale-slider-length: 20;
      -GtkRange-slider-width: 25;
      -GtkRange-trough-border: 1;

      @extend %#{$we}_#{$dn};

      @each $s,$as in ('',''),
                      // (':hover','-hover'),
                      (':active','-active'),
                      (':insensitive','-insensitive') {
        &.slider#{$s} {
          $_url: 'assets/slider-#{$dn}-#{$w}#{$as}#{$asset_suffix}';
          border-style: none;
          border-radius: 0;
          background-color: transparent;
          background-image: -gtk-scaled(url('#{$_url}.png'),
                            url('#{$_url}@2.png'));
          background-repeat: no-repeat;
          background-position: center;
          box-shadow: none;
        }
      }
    }
  }
}

%scale_marks_above_horz {
  .trough { margin: 15px 10px 10px; }
  // &.fine-tune .trough { margin: 13px 8px 8px; }
}
%scale_marks_below_horz {
  .trough { margin: 10px 10px 15px; }
  // &.fine-tune .trough { margin: 8px 8px 13px; }
}
%scale_marks_above_vert {
  .trough { margin: 10px 10px 10px 15px; }
  // &.fine-tune .trough { margin: 8px 8px 8px 13px; }
}
%scale_marks_below_vert {
  .trough { margin: 10px 15px 10px 10px; }
  // &.fine-tune .trough { margin: 8px 13px 8px 8px; }
}


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

GtkProgressBar {
  -GtkProgressBar-min-horizontal-bar-height: 4;
  -GtkProgressBar-min-vertical-bar-width: 4;
  padding: 0;
  font-size: 90%;
  color: $tertiary_fg_color;

  &.osd {
    -GtkProgressBar-xspacing: 0;
    -GtkProgressBar-yspacing: 0;
    -GtkProgressBar-min-horizontal-bar-height: 4;
  }

  &.trough { // background
    border-radius: 0;
    background-color: gtkopacity($accent_color, 0.2);

    &.osd {
      border-style: none;
      box-shadow: none;
      background-color: gtkopacity($accent_color, 0.2);
    }
  }
}

// moving bit
.progressbar {
  border-radius: 0;
  background-color: $accent_color;

  &.left {
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
  }
  &.right {
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
  }
  &.left.right {
    box-shadow: none;
  }

  &.vertical {
    &.top {
      border-top-left-radius: 0;
      border-top-right-radius: 0;
    }
    &.bottom {
      border-bottom-left-radius: 0;
      border-bottom-right-radius: 0;
      box-shadow: none;
    }
  }

  &.osd {
    background-image: none;
    background-color: $accent_color;
    border-style: none;
    border-radius: 0;
  }
}

%entry_progressbar { // progress inside .entry
  border-style: none none solid;
  border-width: 2px;
  border-image: -gtk-gradient(radial,
                              center bottom, 0,
                              center bottom, 0.5,
                              to($accent_color),
                              to(transparent))
                              0 0 2 / 0 0 2px;
  border-radius: 0;
  box-shadow: none;
  background-color: transparent;
  background-image: none;
}

%treeview_progressbar { // progress inside GtkTreeView
  border-style: none none solid;
  border-width: 4px;
  border-radius: 0;
  box-shadow: none;
  background-color: transparent;
  background-image: none;
}


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

.level-bar {
  box-shadow: $z-depth-1; // needs to be set here to avoid clipping
  -GtkLevelBar-min-block-width: 36;
  -GtkLevelBar-min-block-height: 4;

  &.vertical {
    -GtkLevelBar-min-block-width: 4;
    -GtkLevelBar-min-block-height: 36;
  }

  &.trough {
    padding: 2px;
    border-radius: 2px;
    box-shadow: $z-depth-1;
    &:insensitive { box-shadow: none; }
    &.indicator-discrete {
      &.horizontal { padding: 2px 1px; }
      &.vertical { padding: 1px 2px; }
    }
  }

  &.fill-block {
    // FIXME: it would be nice to set make fill blocks bigger, but we'd need
    // :nth-child working on discrete indicators
    background-color: $accent_color;
    border-radius: 0;
    box-shadow: none;
    &.indicator-discrete {
      &.horizontal { margin: 0 1px; }
      &.vertical { margin: 1px 0; }
    }
    &.level-high { background-color: $success_color; }
    &.level-low { background-color: $accent_color; }
    &.empty-fill-block { background-color: $track_color; }
  }
}


/**********
 * Frames *
 **********/

.frame {
  border: 1px solid $borders_color;
  padding: 0;

  &.flat { border-style: none; }

  &.action-bar {
    padding: 0.4em;
    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: $borders_color;

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


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

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

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

.list-row.activatable {
  // let's take care of background colors
  background-image: -gtk-gradient(radial,
                                  center center, 0,
                                  center center, 0.5,
                                  to(gtkalpha(currentColor, 0)),
                                  to(transparent)),
                    linear-gradient(to bottom, gtkalpha(currentColor, 0));
  background-repeat: no-repeat;
  background-position: center, center;
  background-size: 192px * 1 / 0.8 192px * 1 / 0.8, auto;
  &:hover {
    background-image: -gtk-gradient(radial,
                                    center center, 0,
                                    center center, 0.5,
                                    to(gtkalpha(currentColor, 0)),
                                    to(transparent)),
                      linear-gradient(to bottom, gtkalpha(currentColor, 0.05));
  }
  &:active {
    animation: list_ripple_effect 0.2s cubic-bezier(0.4, 0, 0.2, 1) forwards;
  }
  &:insensitive {color: $insensitive_fg_color; }
}

.list-row:selected {
  @extend %selected_items;
  .button {
    &:insensitive { color: $insensitive_secondary_selected_fg_color; }
    &.flat {
      color: $secondary_selected_fg_color;
      &:hover, &:active { color: $selected_fg_color; }
      &:insensitive { color: $insensitive_secondary_selected_fg_color; }
    }
  }
}

// button spacing
.list-row {
  .button.image-button {
    padding: 0.4em;
    background-size: 2em * 1 / 0.8 2em * 1 / 0.8, auto;
  }
}

// transition
.list-row {
  &:hover { transition: none; }
}


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

.app-notification,
.app-notification.frame {
  @extend %osd;
  @extend .toolbar.osd;
  .button {
  }
}


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

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

  &:checked { -gtk-icon-source: -gtk-icontheme('pan-down-symbolic'); }
  &:not(:hover):not(:active) { color: gtkalpha(currentColor, 0.75); }
  &:selected { color: $selected_fg_color; }

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


/************
 * Calendar *
 ***********/

GtkCalendar {
  margin: 0.6em 0;
  padding: 0.4em 0.1em 0.2em;
  border: 1px solid $borders_color;
  color: $fg_color;
  &:selected {
    border: none;
    border-radius: 100px;
    color: $selected_fg_color;
    background-color: transparent;
    background-image: -gtk-scaled(url("assets/calendar-day-selected.png"),
                                  url("assets/calendar-day-selected@2.png"));
    background-size: 2em 2em;
    background-position: center top;
    background-repeat: no-repeat;
  }

  &.header {
    border: 1px solid transparent;
    border-bottom-color: $borders_color;
    border-radius: 0;
  }

  &.button {
    @include button(flat-normal);
    color: gtkalpha(currentColor, 0.20);
    &:hover { @include button(flat-hover); }
    &:active { @include button(flat-active); }
    &:insensitive { @include button(flat-insensitive); }
  }

  &:inconsistent { color: gtkalpha(currentColor, 0.20); }
  &.highlight {
    color: gtkalpha(currentColor, 0.55);
    font-size: 90%;
    font-weight: 500;
  }
}


/***********
 * Dialogs *
 ***********/

.message-dialog { // Message Dialog styling
  color: $inverted_fg_color;

  &.background {
    background-color: $inverted_dark_color;
    opacity: 0.9;
  }

  .titlebar {
    border-style: none;
    color: $inverted_fg_color;
    background-color: $inverted_dark_color;
  }

  .entry {
    color: $inverted_fg_color;
    &:focus { color: $selected_fg_color; }
    &:insensitive { color: $insensitive_inverted_fg_color; }
  }

  .button { // set foregrounds for fallback-mode
    color: $secondary_accent_color;
    &:hover,
    &:active,
    &:checked { color: $accent_color; }
    &:insensitive { color: $insensitive_inverted_fg_color; }
  }
  .linked > .button {
    border: 2px solid transparent;
    border-radius: 2px;
    border-image: none;
    box-shadow: none;
  }

  // always use dark variant for check/radio icons
  @each $s,$as in ('','-unchecked'),
                  (':hover', '-unchecked-active'),
                  (':active', '-unchecked-active'),
                  (':insensitive','-unchecked-insensitive'),
                  (':inconsistent', '-mixed'),
                  (':inconsistent:hover', '-mixed-active'),
                  (':inconsistent:active', '-mixed-active'),
                  (':inconsistent:insensitive', '-mixed-insensitive'),
                  (':checked', '-checked'),
                  (':checked:hover', '-checked-active'),
                  (':checked:active', '-checked-active'),
                  (':checked:insensitive','-checked-insensitive') {
    .check#{$s} {
      -gtk-icon-source: -gtk-scaled(url("assets/checkbox#{$as}-dark.png"),
                                    url("assets/checkbox#{$as}-dark@2.png"));
    }
    .radio#{$s} {
      -gtk-icon-source: -gtk-scaled(url("assets/radio#{$as}-dark.png"),
                                    url("assets/radio#{$as}-dark@2.png"));
    }
  }

  GtkCheckButton.text-button,
  GtkRadioButton.text-button {
    color: $inverted_secondary_fg_color;
    &:hover,
    &:active,
    &:checked { color: $inverted_fg_color; }
    &:insensitive,
    &:insensitive:active,
    &:insensitive:inconsistent {
      // set insensitive color, which is overriden otherwise
      color: $insensitive_inverted_fg_color;
    }
  }

  &.csd { // rounded bottom border styling for csd version
    &.background {
      // bigger radius for better antialiasing
      border-bottom-left-radius: 2px;
      border-bottom-right-radius: 2px;
    }

    .dialog-action-area {
      .button,
      .linked > .button {
        @extend .button.flat;
        padding: 0.7em 1em 0.8em;
        border: 2px solid transparent;
        border-radius: 0;
        color: $secondary_accent_color;
        background-size: 192px * 1 / 0.8 192px * 1 / 0.8, auto;
        &:hover {
          @include button(flat-hover);
          color: $accent_color;
        }
        &:active {
          @include button(flat-active);
          color: $accent_color;
        }
        &:checked {
          @include button(flat-checked);
          color: $secondary_accent_color;
        }
        &:insensitive { @include button(flat-insensitive); }

        &:first-child {
          border-bottom-left-radius: 2px;
          border-right-width: 0;
        }
        &:last-child {
          border-bottom-right-radius: 2px;
          border-left-width: 0;
        }
      }
    }
  }
}

GtkFileChooserDialog {
  .search-bar {
    // background-color: $base_color;
    // border-color: $bg_color;
  }

  .dialog-action-box { border-top: 1px solid $borders_color; }
}


/***********
 * Sidebar *
 ***********/

.sidebar {
  border: none;
  color: $secondary_fg_color;

  &, .list { // draw shadows
    &:dir(ltr) { box-shadow: if($variant == 'light', $sidebar-light-ltr,
                                                     $sidebar-dark-ltr);
    }
    &:dir(rtl) { box-shadow: if($variant == 'light', $sidebar-light-rtl,
                                                     $sidebar-dark-rtl);
    }
  }

  // remove background from child-elements
  GtkTreeView.view,
  .frame,
  .list { background-color: transparent; }

  GtkTreeView.view {
    box-shadow: none;
    &:selected,
    .list-row:selected { @extend %selected_items; }
  }

  // fill actual background
  background-color: $secondary_dark_color;
  .frame .list { box-shadow: none; }

  // disable shadows on overshoot/undershoot area
  // of gtk3-demo's sidebar
  .overshoot,
  .undershoot { box-shadow: none; }
}

GtkSidebarRow {
  &.list-row {
    padding: 0; // Needs overriding of the GtkListBoxRow padding
    color: $secondary_fg_color;
    font-weight: 500;
    &:hover { color: $fg_color; }
    &:selected {
      color: $selected_bg_color;
      background-color: transparent;
    }
    &:backdrop { opacity: 1.0; }
  }

  // Using margins/padding directly in the SidebarRow
  // will make the animation of the new bookmark row jump
  .sidebar-revealer { padding: 0.2em 1.1em 0.2em 1em; }

  .sidebar-icon {
    opacity: 0.75; // dim the device icons
    &:dir(ltr) { padding-right: 0.6em; }
    &:dir(rtl) { padding-left: 0.6em; }
  }

  .sidebar-label {
    &:dir(ltr) { padding-right: 0.1em; }
    &:dir(rtl) { padding-left: 0.1em; }
  }
}

GtkPlacesSidebar.sidebar {
  // in the sidebar case it makes no sense to click the selected row
  // .list-row:selected:active { box-shadow: none; }

  // looks like the label doesn't get all the states so work around
  .list-row:selected:insensitive .label { color: $insensitive_selected_fg_color; }

  .list-row:selected { // 'eject' button
    .sidebar-button.button {
      color: $secondary_selected_bg_color;
      &:hover,
      &:active { color: $selected_bg_color; }
    }
  }

  .sidebar-placeholder-row { border: solid 1px $selected_bg_color; }

  .sidebar-new-bookmark-row { color: $selected_bg_color; }

  // @at-root needded to not change the specificity making button styling
  // inheritance broken so istead of
  // "GtkPlacesSidebar.sidebar .sidebar-button.button" [specificity 0,0,3,1]
  // the extended selector ".sidebar-button.button" [specificity 0,0,2,0]
  @at-root .sidebar-button.button { 
    &.image-button {
      padding: 4px;
      color: $secondary_fg_color;
      &:hover,
      &:active,
      &:checked { color: $fg_color; }
    }

    @extend .button.flat;
    // border-radius: 100%;
    // outline-radius: 100%;
  }

  // this is for indicating which sidebar row generated a popover
  // see https://bugzilla.gnome.org/show_bug.cgi?id=754411
  .has-open-popup {
    @extend .list-row.activatable:active;
    transition: none;
  }
}

.sidebar-item {
  padding: 0.8em 0.6em;
  > .label {
    padding-left: 0.4em;
    padding-right: 0.4em;
  }

  &.needs-attention > .label { @extend %needs_attention; }
}

GtkStackSidebar {
  .sidebar-item {
    padding: 0.8em 0.6em;
    > .label {
      padding-left: 0.4em;
      padding-right: 0.4em;
    }
    color: $secondary_fg_color;
    font-weight: 500;
    &:hover { color: $fg_color; }
    &:selected {
      color: $selected_bg_color;
      background-color: transparent;
    }
    &:backdrop { opacity: 1.0; }
  }

  .frame .list { // draw shadows
    // dim background with alpha-blending
    background-color: if($variant == 'light', rgba(12, 18, 0, 0.01),
                                              rgba(18, 22, 0, 0.04));

    &:dir(ltr) { box-shadow: if($variant == 'light', $sidebar-light-ltr,
                                                     $sidebar-dark-ltr);
    }
    &:dir(rtl) { box-shadow: if($variant == 'light', $sidebar-light-rtl,
                                                     $sidebar-dark-rtl);
    }
  }

  // remove unwanted separator
  .separator { -GtkWidget-wide-separators: true; }
}


/*********
 * 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: 6; // 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 {
  padding: 0.4em;
  border-width: 0 0 1px;
  border-style: solid;
  // do not use transparentize
  border-color: $solid_light_borders_color;
  background-color: $secondary_dark_color;
}

.info,
.question,
.warning,
.error { // always use dark foreground colour
  color: $secondary_fixed_fg_color;

  .button {
    @extend .button.flat;
    color: $secondary_fixed_fg_color;
    &:insensitive { color: $insensitive_fixed_fg_color; }
    &.flat {
      color: $secondary_fixed_fg_color;
      &:hover, &:active { color: $fixed_fg_color; }
      &:insensitive { color: $insensitive_fixed_fg_color; }
    }
  }

  .label:selected,
  .label:selected:focus,
  .label:selected:hover {
    background-color: darken($selected_bg_color, 10%);
  }

  // use 'white' bit and trough
  GtkProgressBar.trough { background-color: gtkopacity($selected_fg_color, 0.2); }
  .progressbar { background-color: $selected_fg_color; }
}

.info { background-color: $info_bg_color; }

.question { background-color: $question_bg_color; }

.warning { background-color: $warning_bg_color; }

.error { // use white text for this
  color: $selected_fg_color;
  background-color: $error_bg_color;
}


/************
 * 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: gtkopacity($inverted_dark_color, 0.9);
  }

  color: $inverted_fg_color;
  padding: 0.2em; // not working
  border-radius: 2px;
  box-shadow: none; // otherwise it gets inherited by windowframe.csd

  // FIXME: we need a border or tooltips vanish on black background.
  &.window-frame.csd {
    background-color: transparent;
  }
}

.tooltip * { // Yeah this is ugly
  padding: 0.2em;
  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.

  box-shadow: $z-depth-1;

  // we need to re-set the shadow here since it get axed by the previous bit
  &:selected {
  }

  // base color corners rounding
  // to avoid the artifacts caused by rounded corner anti-aliasing the base
  // color sports a bigger radius.
  // nth-child is needed by the custom color strip.
  // The :not() madness is needed since actually the overlay is selectable
  // by GtkColorSwatch > .overlay and GtkColorSwatch.overlay,
  // I know it's weird, but this is gtk+, not a browser.
  &.top {
    border-top-left-radius: 2px;
    border-top-right-radius: 2px;
  }
  &.bottom {
    border-bottom-left-radius: 2px;
    border-bottom-right-radius: 2px;
  }
  &.left, &:first-child:not(.overlay):not(.top) {
    border-top-left-radius: 2px;
    border-bottom-left-radius: 2px;
  }
  &.right, &:last-child:not(.overlay):not(.bottom) {
    border-top-right-radius: 2px;
    border-bottom-right-radius: 2px;
  }
  &:only-child:not(.overlay) { border-radius: 2px; }

  // overlay corner rounding
  &.top > .overlay {
    border-top-left-radius: 2px;
    border-top-right-radius: 2px;
  }
  &.bottom > .overlay {
    border-bottom-left-radius: 2px;
    border-bottom-right-radius: 2px;
  }
  &:first-child:not(.top) > .overlay {
    border-top-left-radius: 2px;
    border-bottom-left-radius: 2px;
  }
  &:last-child:not(.bottom) > .overlay {
    border-top-right-radius: 2px;
    border-bottom-right-radius: 2px;
  }
  &:only-child > .overlay { border-radius: 2px; }

  // hover effect
  &:hover { box-shadow: $z-depth-2; }

  // no hover effect for the colorswatch in the color editor
  GtkColorEditor & {
    border-radius: 2px; // same radius as the entry
    &:hover { box-shadow: $z-depth-1; }
  }

  // indicator and keynav outline colors
  &.color-dark { color: #FFFFFF; }
  &.color-light { color: gtkopacity(#000000, 0.8); }

  // border color
  &.overlay,
  &.overlay:selected {
  }

  // make the add color button looks like, well, a button
  &#add-color-button {
  background-image: linear-gradient(to right,
                                    $error_bg_color 25%,
                                    $warning_bg_color 25%,
                                    $warning_bg_color 50%,
                                    $info_bg_color 50%,
                                    $info_bg_color 75%,
                                    $question_bg_color 75%);
  color: #FFFFFF;
  }
}


/********
 * Misc *
 ********/

// content view (grid/list)
.content-view {
  background-color: $bg_color;
  // &:hover { -gtk-image-effect: highlight; }

  &.rubberband { @extend .rubberband; }
}

.scale-popup {
  .osd & { @extend %osd; }

  .osd & .button.flat {  // FIXME: quick hack, redo properly
  }

  .osd & .vertical .button,
  & .vertical .button { // +/- buttons on GtkVolumeButton popup
    border-radius: 100px;
    outline-radius: 100px;
    background-color: transparent;
    color: $secondary_fg_color;
    &:first-child { // '+' button
      &:hover {
        @include button(flat-hover);
        background: none;
        color: $success_color;
      }
      &:insensitive {
        @include button(flat-insensitive);
        background: none;
        color: gtkalpha($success_color, 0.4);
      }
    }
    &:last-child { // '-' button
      &:hover {
        @include button(flat-hover);
        background: none;
        color: $error_color;
      }
      &:insensitive {
        @include button(flat-insensitive);
        background: none;
        color: gtkalpha($error_color, 0.4);
      }
    }
  }

  .osd & .button,
  .button {
    border-radius: 100px;
    outline-radius: 100px;
    background-color: transparent;
    color: $secondary_fg_color;
    &:first-child { // '-' button
      &:hover {
        @include button(flat-hover);
        background: none;
        color: $error_color;
      }
      &:insensitive {
        @include button(flat-insensitive);
        background: none;
        color: gtkalpha($error_color, 0.4);
      }
    }
    &:last-child { // '+' button
      &:hover {
        @include button(flat-hover);
        background: none;
        color: $success_color;
      }
      &:insensitive {
        @include button(flat-insensitive);
        background: none;
        color: gtkalpha($success_color, 0.4);
      }
    }
  }
}

GtkScaleButton.button,
GtkVolumeButton.button {
  // I assume both are image-button *by default*
  // with the image-button/text-button classes automagically applied
  // depending on the button child these selectors can be deleted.
  @extend %image_button;
  @extend .button.flat;
  border-radius: 100px;
  outline-radius: 100px;

  &.text-button {
    border-radius: 2px;
    outline-radius: 2px;
  }
}

.floating-bar {
  @extend %osd;
  padding: 0.1em 0 0.2em;
  border: 1px solid transparent;
  border-radius: 0;
  color: $inverted_secondary_fg_color;
  background-color: $inverted_dark_color;
  transition: none;

  .button {
    padding: 0.3em;
    margin: 0 0.3em;
    color: $secondary_accent_color;
    &:hover,
    &:active,
    &:checked { color: $accent_color; }
    &:insensitive { color: gtkopacity($accent_color, 0.4); }
  }
}

.floating-bar.bottom {
  &.left { // axes left border and border radius
    border-width: 1px 1px 0 0;
    border-radius: 0 2px + 1px 0 0;
  }

  &.right { // axes right border and border radius
    border-width: 1px 0 0 1px;
    border-radius: 2px + 1px 0 0 0;
  }
}


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

.window-frame {
  transition: none;
  border-radius: 2px 2px 0 0;
  box-shadow: $z-depth-4;

  // FIXME: rationalize window-frame shadows

  // this is used for the resize cursor area
  margin: 8px;

  &:backdrop { box-shadow: $z-depth-2; }

  &.maximized,
  &.tiled {
    border-radius: 0;
    transition: none;

    &.ssd .titlebar { box-shadow: none; }
  }

  &.popup { box-shadow: none; }

  // server-side decorations as used by mutter
  &.ssd {
    // just doing borders, wm draws actual shadows
    // otherwise incorrect shadows are appeared
    box-shadow: 0 0 0 1px transparent;

    .titlebar {
      // revive top-edge highlight border
      box-shadow: inset 0 1px $highlight_color;
    }

    .tiled .titlebar {
      @extend %tiled_integration;
      transition: none;
    }
    .maximized .titlebar {
      @extend %maxd_integration;
      transition: none;
    }
  }

  &.csd {
    &.popup {
      border-radius: 2px;
      box-shadow: $z-depth-3;
    }
    &.tooltip {
      border-radius: 2px;
      box-shadow: $z-depth-2;
    }
    &.message-dialog {
      border-radius: 2px;
      box-shadow: $z-depth-4;
      &:backdrop { box-shadow: $z-depth-2; }
    }
  }

  &.solid-csd {
    border-radius: 2px 2px 0 0;
    margin: -1px;
    background-color: $bg_color;
    border: none;
    box-shadow: none;
  }
}

// Window manager buttons
.csd .header-bar,
.csd .titlebar {
  & .button.titlebutton,
  &.selection-mode .button.titlebutton {
    @extend %image_button;

    &.close,
    &.minimize,
    &.maximize {
      &:hover:backdrop,
      &:active:backdrop { opacity: 1.0; }

      > GtkImage {
        color: transparent;
        background-size: 16px 16px;
        background-repeat: no-repeat;
        background-position: center;
      }
    }

    // raised 'Close' button
    &.close {
      > GtkImage {
        background-image: -gtk-scaled(url("assets/window-close.png"),
                                      url("assets/window-close@2.png"));
      }

      &:hover {
        @include button(hover);
        color: $selected_fg_color;
        background-color: $destructive_color;

        > GtkImage {
          background-image: -gtk-scaled(url("assets/window-close-active.png"),
                                        url("assets/window-close-active@2.png"));
        }
      }
      &:active {
        @include button(active);
        color: $selected_fg_color;
        background-color: $selected_bg_color;

        > GtkImage {
          background-image: -gtk-scaled(url("assets/window-close-active.png"),
                                        url("assets/window-close-active@2.png"));
        }
      }
    }

    &.minimize {
      > GtkImage {
        background-image: -gtk-scaled(url("assets/window-minimize.png"),
                                      url("assets/window-minimize@2.png"));
      }

      &:hover,
      &:active {
        > GtkImage {
          background-image: -gtk-scaled(url("assets/window-minimize-active.png"),
                                        url("assets/window-minimize-active@2.png"));
        }
      }
    }

    &.maximize {
      > GtkImage {
        background-image: -gtk-scaled(url("assets/window-maximize.png"),
                                      url("assets/window-maximize@2.png"));
      }

      &:hover,
      &:active {
        > GtkImage {
          background-image: -gtk-scaled(url("assets/window-maximize-active.png"),
                                        url("assets/window-maximize-active@2.png"));
        }
      }
    }
  }
}

.maximized.csd .header-bar,
.maximized.csd .titlebar {
  .button.titlebutton,
  &.selection-mode .button.titlebutton {
    &.maximize {
      > GtkImage {
        background-image: -gtk-scaled(url("assets/window-unmaximize.png"),
                                      url("assets/window-unmaximize@2.png"));
      }

      &:hover,
      &:active {
        > GtkImage {
          background-image: -gtk-scaled(url("assets/window-unmaximize-active.png"),
                                        url("assets/window-unmaximize-active@2.png"));
        }
      }
    }
  }
}

// specific button styling for SSDs
.ssd .titlebar {
  .button.titlebutton {
    padding: 6px;

    &.close,
    &.minimize,
    &.maximize { // reset styling
      color: transparent;
      background-size: 28px 28px;
      background-repeat: no-repeat;
      background-position: center;
      background: none;
      box-shadow: none;
      &:backdrop,
      &:hover:backdrop,
      &:active:backdrop { color: transparent; }
    }

    @each $_class,
          $_state,
          $_shadow in ('', '', none),
                      (':hover', '-hover', $z-depth-2),
                      (':active', '-active', $z-depth-2),
                      (':backdrop', '-backdrop', none),
                      (':backdrop:hover', '-backdrop-hover', $z-depth-2),
                      (':backdrop:active', '-backdrop-active', $z-depth-2) {
      &.close#{$_class} {
        background-image: -gtk-scaled(
                          url("assets/window-close-ssd#{$_state}.png"),
                          url("assets/window-close-ssd#{$_state}@2.png"));
        box-shadow: #{$_shadow};
      }
    }

    @each $_class, $_state in ('', ''),
                              (':hover', '-hover'),
                              (':active', '-active'),
                              (':backdrop', '-backdrop'),
                              (':backdrop:hover', '-backdrop-hover'),
                              (':backdrop:active', '-backdrop-active') {
      &.minimize#{$_class} {
        background-image: -gtk-scaled(
                          url("assets/window-minimize-ssd#{$_state}.png"),
                          url("assets/window-minimize-ssd#{$_state}@2.png"));
      }
    }

    @each $_class, $_state in ('', ''),
                              (':hover', '-hover'),
                              (':active', '-active'),
                              (':backdrop', '-backdrop'),
                              (':backdrop:hover', '-backdrop-hover'),
                              (':backdrop:active', '-backdrop-active') {
      &.maximize#{$_class} {
        background-image: -gtk-scaled(
                          url("assets/window-maximize-ssd#{$_state}.png"),
                          url("assets/window-maximize-ssd#{$_state}@2.png"));
      }
    }
  }
}

.maximized.ssd .titlebar {
  .button.titlebutton {
    @each $_class, $_state in ('', ''),
                              (':hover', '-hover'),
                              (':active', '-active'),
                              (':backdrop', '-backdrop'),
                              (':backdrop:hover', '-backdrop-hover'),
                              (':backdrop:active', '-backdrop-active') {
      &.maximize#{$_class} {
        background-image: -gtk-scaled(
                          url("assets/window-unmaximize-ssd#{$_state}.png"),
                          url("assets/window-unmaximize-ssd#{$_state}@2.png"));
      }
    }
  }
}

// catch all extend :)

%selected_items {
  background-color: $selected_bg_color;
  color: $selected_fg_color;
  &:insensitive { color: $insensitive_selected_fg_color; }
  &:backdrop {
    &:insensitive { color: $insensitive_selected_fg_color; }
  }
}

.monospace {
  font-family: Monospace;
}


/**********************
 * Touch Copy & Paste *
 *********************/

// touch selection handlebars for the Popover.osd above
.entry.cursor-handle,
.cursor-handle {
  border-style: none;
  background-color: $accent_color;
  background-image: none;
  box-shadow: none;

  @each $s,$as in ('',''),
                  (':hover','-hover'),
                  (':active','-active') {
                    // no need for insensitive and backdrop
                    &.top#{$s}:dir(ltr),
                    &.bottom#{$s}:dir(rtl) {
                      $_url: 'assets/text-select-start#{$as}#{$asset_suffix}';
                      -gtk-icon-source: -gtk-scaled(url('#{$_url}.png'),
                                        url('#{$_url}@2.png'));
                      padding-left: 0.8em;
                    }
                    &.bottom#{$s}:dir(ltr),
                    &.top#{$s}:dir(rtl) {
                      $_url: 'assets/text-select-end#{$as}#{$asset_suffix}';
                      -gtk-icon-source: -gtk-scaled(url('#{$_url}.png'),
                                        url('#{$_url}@2.png'));
                      padding-right: 0.8em;
                    }
                    &.insertion-cursor#{$s}:dir(ltr),
                    &.insertion-cursor#{$s}:dir(rtl) {
                      $_url: 'assets/slider-horz-scale-has-marks-above#{$as}#{$asset_suffix}';
                      -gtk-icon-source: -gtk-scaled(url('#{$_url}.png'),
                                        url('#{$_url}@2.png'));
     }
  }
}

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

.touch-selection {
  font: initial;
  color: $fg_color;
  background-color: $base_color;
  box-shadow: $z-depth-2;
  &:backdrop { box-shadow: $z-depth-1; }

  .button {
  }
}

// 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); }
}

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

  GtkBox > GtkScrlledWindow & {
    &.top { @include undershoot(top, $bg_color); }
    &.bottom { @include undershoot(bottom, $bg_color); }
    &.left { @include undershoot(left, $bg_color); }
    &.right { @include undershoot(right, $bg_color); }
  }

  .sidebar & {
    &.top { @include undershoot(top, $secondary_dark_color); }
    &.bottom { @include undershoot(bottom, $secondary_dark_color); }
    &.left { @include undershoot(left, $secondary_dark_color); }
    &.right { @include undershoot(right, $secondary_dark_color); }
  }
}