artwork/usr/share/themes/Lubuntu-default/gtk-3.0/gtk-widgets-backdrop.css

/* NOTES to contributors:
 * use 4 spaces intends, and keep code ALIGNED and ORDERED */

GtkWindow:backdrop {
    color: mix (@fg_color, @bg_color, 0.17);
}

* {
    /* inherit the color from parent by default */
    color: inherit;
    background-color: @bg_color;
}

/******************
 * common effects *
 ******************/
/* border and inner stroke */
.frame:backdrop,
.notebook:backdrop {
    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (shade (@bg_color, 0.86)),
                                           to (shade (@bg_color, 0.82)));
}

.notebook tab:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@bg_color, 0.99)),
                                     color-stop (0.80, shade (@bg_color, 0.97)),
                                     to (shade (@bg_color, 0.94)));

    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (shade (@bg_color, 0.9)),
                                           to (shade (@bg_color, 0.87)));
    -unico-inner-stroke-color: alpha (shade (@bg_color, 1.26), 0.3);
}

.notebook tab:active:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@bg_color, 1.1)),
                                     to (shade (@bg_color, 1.01)));

    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (shade (@bg_color, 0.92)),
                                           to (shade (@bg_color, 0.86)));
}

/**********
 * button *
 **********/
GtkComboBox:backdrop,
.button:backdrop,
GtkComboBox.combobox-entry .button:backdrop,
GtkScale.slider:backdrop,
GtkScale.slider.vertical:backdrop,
.notebook .button:backdrop,
.inline-toolbar.toolbar .button:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@bg_color, 1.03)),
                                     to (shade (@bg_color, 0.97)));
    border-top-color: shade (@bg_color, 0.86);
    border-right-color: shade (@bg_color, 0.82);
    border-bottom-color: shade (@bg_color, 0.76);
    border-left-color: shade (@bg_color, 0.82);

    color: mix (@fg_color, @bg_color, 0.2);
    text-shadow: 0 1px alpha (shade (@button_bg_color, 1.25), 0.16);

    -unico-border-gradient: none;
    -unico-glow-radius: 0;
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@bg_color, 1.05)),
                                                 to (shade (@bg_color, 0.985)));
}

.button:hover:backdrop,
GtkComboBox.combobox-entry .button:hover:backdrop,
GtkScale.slider:hover:backdrop,
GtkScale.slider.vertical:hover:backdrop,
.notebook .button:hover:backdrop,
.inline-toolbar.toolbar .button:hover:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@bg_color, 1.16)),
                                     to (shade (@bg_color, 0.95)));
    border-top-color: shade (@bg_color, 0.85);
    border-right-color: shade (@bg_color, 0.82);
    border-bottom-color: shade (@bg_color, 0.67);
    border-left-color: shade (@bg_color, 0.82);

    -unico-border-gradient: none;
    -unico-glow-color: shade (@bg_color, 1.07);
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@bg_color, 1.21)),
                                                 to (shade (@bg_color, 1.02)));
}

.button:active:backdrop,
GtkComboBox.combobox-entry .button:active:backdrop,
.notebook .button:active:backdrop,
.inline-toolbar.toolbar .button:active:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@bg_color, 0.9)),
                                     to (shade (@bg_color, 0.95)));
    border-top-color: shade (@bg_color, 0.62);
    border-right-color: shade (@bg_color, 0.72);
    border-bottom-color: shade (@bg_color, 0.76);
    border-left-color: shade (@bg_color, 0.72);

    -unico-border-gradient: none;
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@bg_color, 0.85)),
                                                 to (shade (@bg_color, 0.9)));
}

.button:active:hover:backdrop,
GtkComboBox.combobox-entry .button:active:hover:backdrop,
.notebook .button:active:hover:backdrop,
.inline-toolbar.toolbar .button:active:hover:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@bg_color, 0.95)),
                                     to (shade (@bg_color, 1.0)));
    border-top-color: shade (@bg_color, 0.64);
    border-right-color: shade (@bg_color, 0.74);
    border-bottom-color: shade (@bg_color, 0.79);
    border-left-color: shade (@bg_color, 0.74);

    -unico-border-gradient: none;
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@bg_color, 0.93)),
                                                 to (shade (@bg_color, 0.94)));
}

.button:insensitive:backdrop,
GtkComboBox.combobox-entry .button:insensitive:backdrop,
.notebook .button:insensitive:backdrop,
.inline-toolbar.toolbar .button:insensitive:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@bg_color, 1.06)),
                                     to (shade (@bg_color, 0.98)));
    border-top-color: shade (@bg_color, 0.86);
    border-right-color: shade (@bg_color, 0.86);
    border-bottom-color: shade (@bg_color, 0.86);
    border-left-color: shade (@bg_color, 0.9);

    -unico-border-gradient: none;
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@bg_color, 1.1)),
                                                 to (shade (@bg_color, 1.0)));
}

/* default button */
.button.default:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (mix (shade (@backdrop_selected_bg_color, 1.16), @bg_color, 0.3)),
                                     to (mix (shade (@backdrop_selected_bg_color, 0.84), @bg_color, 0.3)));

    text-shadow: 0 1px alpha (shade (@backdrop_selected_bg_color, 1.26), 0.4);

    -unico-focus-border-color: @transparent;
    -unico-focus-outer-stroke-color: alpha (@backdrop_selected_bg_color, 0.2);

    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (mix (shade (@backdrop_selected_bg_color, 0.8), @bg_color, 0.3)),
                                           to (mix (shade (@backdrop_selected_bg_color, 0.64), @bg_color, 0.3)));
    -unico-glow-radius: 0;
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (mix (shade (@backdrop_selected_bg_color, 1.26), @bg_color, 0.3)),
                                                 to (mix (shade (@backdrop_selected_bg_color, 0.9), @bg_color, 0.3)));
}

.button.default:hover:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (mix (shade (@backdrop_selected_bg_color, 1.21), @bg_color, 0.3)),
                                     to (mix (shade (@backdrop_selected_bg_color, 0.89), @bg_color, 0.3)));

    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (mix (shade (@backdrop_selected_bg_color, 0.83), @bg_color, 0.3)),
                                           to (mix (shade (@backdrop_selected_bg_color, 0.67), @bg_color, 0.3)));
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (mix (shade (@backdrop_selected_bg_color, 1.3), @bg_color, 0.3)),
                                                 to (mix (shade (@backdrop_selected_bg_color, 0.95), @bg_color, 0.3)));
}

.button.default:active:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (mix (shade (@backdrop_selected_bg_color, 0.95), @bg_color, 0.3)),
                                     to (mix (shade (@backdrop_selected_bg_color, 1.05), @bg_color, 0.3)));

    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (mix (shade (@backdrop_selected_bg_color, 0.7), @bg_color, 0.3)),
                                           to (mix (shade (@backdrop_selected_bg_color, 0.7), @bg_color, 0.3)));
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (mix (shade (@backdrop_selected_bg_color, 0.9), @bg_color, 0.3)),
                                                 to (mix (shade (@backdrop_selected_bg_color, 1.0), @bg_color, 0.3)));
}

.button.default:active:hover:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (mix (shade (@backdrop_selected_bg_color, 1.0), @bg_color, 0.3)),
                                     to (mix (shade (@backdrop_selected_bg_color, 1.1), @bg_color, 0.3)));

    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (mix (shade (@backdrop_selected_bg_color, 0.7), @bg_color, 0.3)),
                                           to (mix (shade (@backdrop_selected_bg_color, 0.7), @bg_color, 0.3)));
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (mix (shade (@backdrop_selected_bg_color, 0.95), @bg_color, 0.3)),
                                                 to (mix (shade (@backdrop_selected_bg_color, 1.05), @bg_color, 0.3)));
}

.button.default:insensitive:backdrop {
    -unico-glow-radius: 0;
}

/* Middle button */
.linked .entry:backdrop,
.linked .button:backdrop,
.linked .button:active:backdrop,
.linked .button:active:hover:backdrop,
.linked .button:insensitive:backdrop,
.primary-toolbar .linked .entry:backdrop,
.primary-toolbar .linked .button:backdrop,
.primary-toolbar .linked .button:active:backdrop,
.primary-toolbar .linked .button:active:hover:backdrop,
.primary-toolbar .linked .button:insensitive:backdrop,
.menubar.toolbar .linked .entry:backdrop,
.menubar.toolbar .linked .button:backdrop,
.menubar.toolbar .linked .button:active:backdrop,
.menubar.toolbar .linked .button:active:hover:backdrop,
.menubar.toolbar .linked .button:insensitive:backdrop,
.header-bar .linked .entry:backdrop,
.header-bar .linked .button:backdrop,
.header-bar .linked .button:active:backdrop,
.header-bar .linked .button:active:hover:backdrop,
.header-bar .linked .button:insensitive:backdrop {
    border-width: 1px;
    border-right-width: 0;

    border-radius: 0;

    -unico-outer-stroke-width: 1px 0 1px 0;
}

/* Leftmost button */
.linked .entry:first-child:backdrop,
.linked .button:first-child:backdrop,
.linked .button:active:first-child:backdrop,
.linked .button:active:hover:first-child:backdrop,
.linked .button:insensitive:first-child:backdrop,
.primary-toolbar .linked .entry:first-child:backdrop,
.primary-toolbar .linked .button:first-child:backdrop,
.primary-toolbar .linked .button:active:first-child:backdrop,
.primary-toolbar .linked .button:active:hover:first-child:backdrop,
.primary-toolbar .linked .button:insensitive:first-child:backdrop,
.menubar.toolbar .linked .entry:first-child:backdrop,
.menubar.toolbar .linked .button:first-child:backdrop,
.menubar.toolbar .linked .button:active:first-child:backdrop,
.menubar.toolbar .linked .button:active:hover:first-child:backdrop,
.menubar.toolbar .linked .button:insensitive:first-child:backdrop,
.header-bar .linked .entry:first-child:backdrop,
.header-bar .linked .button:first-child:backdrop,
.header-bar .linked .button:active:first-child:backdrop,
.header-bar .linked .button:active:hover:first-child:backdrop,
.header-bar .linked .button:insensitive:first-child:backdrop {
    border-width: 1px;
    border-right-width: 0;

    border-radius: 3px;
    border-bottom-right-radius: 0;
    border-top-right-radius: 0;

    -unico-outer-stroke-width: 1px 0 1px 1px;
}

/* Rightmost button */
.linked .entry:last-child:backdrop,
.linked .button:last-child:backdrop,
.linked .button:active:last-child:backdrop,
.linked .button:active:hover:last-child:backdrop,
.linked .button:insensitive:last-child:backdrop,
.primary-toolbar .linked .entry:last-child:backdrop,
.primary-toolbar .linked .button:last-child:backdrop,
.primary-toolbar .linked .button:active:last-child:backdrop,
.primary-toolbar .linked .button:active:hover:last-child:backdrop,
.primary-toolbar .linked .button:insensitive:last-child:backdrop,
.menubar.toolbar .linked .entry:last-child:backdrop,
.menubar.toolbar .linked .button:last-child:backdrop,
.menubar.toolbar .linked .button:active:last-child:backdrop,
.menubar.toolbar .linked .button:active:hover:last-child:backdrop,
.menubar.toolbar .linked .button:insensitive:last-child:backdrop,
.header-bar .linked .entry:last-child:backdrop,
.header-bar .linked .button:last-child:backdrop,
.header-bar .linked .button:active:last-child:backdrop,
.header-bar .linked .button:active:hover:last-child:backdrop,
.header-bar .linked .button:insensitive:last-child:backdrop {
    border-width: 1px;

    border-radius: 3px;
    border-bottom-left-radius: 0;
    border-top-left-radius: 0;

    -unico-outer-stroke-width: 1px 1px 1px 0;
}

/* Linked single button */
.linked .entry:only-child:backdrop,
.linked .button:only-child:backdrop,
.linked .button:active:only-child:backdrop,
.linked .button:active:hover:only-child:backdrop,
.linked .button:insensitive:only-child:backdrop,
.primary-toolbar .linked .entry:only-child:backdrop,
.primary-toolbar .linked .button:only-child:backdrop,
.primary-toolbar .linked .button:active:only-child:backdrop,
.primary-toolbar .linked .button:active:hover:only-child:backdrop,
.primary-toolbar .linked .button:insensitive:only-child:backdrop,
.menubar.toolbar .linked .entry:only-child:backdrop,
.menubar.toolbar .linked .button:only-child:backdrop,
.menubar.toolbar .linked .button:active:only-child:backdrop,
.menubar.toolbar .linked .button:active:hover:only-child:backdrop,
.menubar.toolbar .linked .button:insensitive:only-child:backdrop,
.header-bar .linked .entry:only-child:backdrop,
.header-bar .linked .button:only-child:backdrop,
.header-bar .linked .button:active:only-child:backdrop,
.header-bar .linked .button:active:hover:only-child:backdrop,
.header-bar .linked .button:insensitive:only-child:backdrop {
    border-width: 1px;

    border-radius: 3px;

    -unico-outer-stroke-width: 1px;
}

/****************
 * cell and row *
 ****************/
.cell:backdrop {
    background-color: mix (@base_color, @bg_color, 0.4);
    border-radius: 0;
    border-width: 0;
}

row:selected:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@backdrop_selected_bg_color, 1.06)),
                                     to (shade (@backdrop_selected_bg_color, 1.0)));
    border-top-color: shade (@backdrop_selected_bg_color, 0.98);
    border-style: solid;
    border-width: 1px 0 0 0;

    color: @backdrop_selected_fg_color;
}

/*******************
 * check and radio *
 *******************/
.check row:selected:backdrop,
.radio row:selected:backdrop,
.check:backdrop,
.check row:backdrop,
.radio:backdrop,
.radio row:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (mix (shade (@base_color, 0.98), @bg_color, 0.4)),
                                     to (mix (@base_color, @bg_color, 0.4)));
    border-top-color: shade (@bg_color, 0.72);
    border-right-color: shade (@bg_color, 0.82);
    border-bottom-color: shade (@bg_color, 0.88);
    border-left-color: shade (@bg_color, 0.82);
    border-style: solid;
    border-width: 1px;

    color: mix (@fg_color, @base_color, 0.2);

    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (alpha (shade (@bg_color, 0.05), 0.02)),
                                                 to (alpha (shade (@bg_color, 0.05), 0.01)));
}

.check:backdrop,
.check row:backdrop {
    border-radius: 3px;
}

.radio:backdrop,
.radio row:backdrop {
    border-radius: 10px;
}

/* FIXME (Cimi) this is horrible */
.check:active:backdrop,
.check row:selected:active:backdrop,
.check row:selected:focused:active:backdrop,
.notebook .check:active:backdrop,
.notebook .radio:active:backdrop,
.radio:active:backdrop,
.radio row:selected:active:backdrop,
.radio row:selected:focused:active:backdrop,
.check:inconsistent:backdrop,
.check row:selected:inconsistent:backdrop,
.check row:selected:focused:inconsistent:backdrop,
.notebook .check:inconsistent:backdrop,
.notebook .radio:inconsistent:backdrop,
.radio:inconsistent:backdrop,
.radio row:selected:inconsistent:backdrop,
.radio row:selected:focused:inconsistent:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@backdrop_selected_bg_color, 1.06)),
                                     to (shade (@backdrop_selected_bg_color, 0.94)));

    -unico-bullet-color: shade (@backdrop_selected_bg_color, 0.54);
    -unico-bullet-outline-color: shade (@backdrop_selected_bg_color, 1.12);

    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (shade (@backdrop_selected_bg_color, 0.78)),
                                           to (shade (@backdrop_selected_bg_color, 0.74)));
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@backdrop_selected_bg_color, 1.08)),
                                                 to (shade (@backdrop_selected_bg_color, 0.96)));
    -unico-outer-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (alpha (shade (@bg_color, 0.05), 0.01)),
                                                 to (alpha (shade (@bg_color, 0.05), 0.03)));
    -unico-outer-stroke-width: 1px;
}

/* FIXME (Cimi) this is horrible */
.check:active:hover:backdrop,
.check row:selected:active:hover:backdrop,
.check row:selected:focused:active:hover:backdrop,
.notebook .check:active:hover:backdrop,
.notebook .radio:active:hover:backdrop,
.radio:active:hover:backdrop,
.radio row:selected:active:hover:backdrop,
.radio row:selected:focused:active:hover:backdrop
.check:active:hover:inconsistent:backdrop,
.check row:selected:active:hover:inconsistent:backdrop,
.check row:selected:focused:active:hover:inconsistent:backdrop,
.notebook .check:active:hover:inconsistent:backdrop,
.notebook .radio:active:hover:inconsistent:backdrop,
.radio:active:hover:inconsistent:backdrop,
.radio row:selected:active:hover:inconsistent:backdrop,
.radio row:selected:focused:active:hover:inconsistent:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@backdrop_selected_bg_color, 1.1)),
                                     to (shade (@backdrop_selected_bg_color, 0.98)));

    -unico-bullet-color: shade (@backdrop_selected_bg_color, 0.54);
    -unico-bullet-outline-color: shade (@backdrop_selected_bg_color, 1.14);

    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (shade (@backdrop_selected_bg_color, 0.8)),
                                           to (shade (@backdrop_selected_bg_color, 0.76)));
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@backdrop_selected_bg_color, 1.12)),
                                                 to (shade (@backdrop_selected_bg_color, 1.0)));
}

.check:insensitive:backdrop,
.radio:insensitive:backdrop {
    background-color: shade (@bg_color, 0.98);
    background-image: none;

    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (alpha (shade (@bg_color, 0.05), 0.02)),
                                                 to (alpha (shade (@bg_color, 0.05), 0.01)));
}

.check:insensitive:active:backdrop,
.radio:insensitive:active:backdrop,
.check:insensitive:inconsistent:backdrop,
.radio:insensitive:inconsistent:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@bg_color, 1.0)),
                                     to (shade (@bg_color, 0.94)));

    -unico-bullet-color: shade (@bg_color, 0.7);
    -unico-bullet-outline-color: shade (@bg_color, 1.0);

    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (shade (@bg_color, 0.86)),
                                           to (shade (@bg_color, 0.8)));
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@bg_color, 1.02)),
                                                 to (shade (@bg_color, 0.96)));
}

/*****************
 * column-header *
 *****************/
column-header .button:backdrop,
column-header .button:active:backdrop,
.notebook column-header .button:backdrop,
.notebook column-header .button:active:backdrop {
    border-radius: 0;
    border-width: 0 1px 1px 0;

    -unico-glow-radius: 0;
    -unico-outer-stroke-width: 0;
}

column-header .button:backdrop,
.notebook column-header .button:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@bg_color, 1.04)),
                                     to (shade (@bg_color, 0.98)));

    text-shadow: 0 1px alpha (shade (@bg_color, 1.25), 0.4);

    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (shade (@bg_color, 0.88)),
                                           to (shade (@bg_color, 0.84)));
    -unico-glow-color: shade (@bg_color, 1.02);
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@bg_color, 1.07)),
                                                 to (shade (@bg_color, 1.01)));
}

column-header .button:hover:backdrop,
.notebook column-header .button:hover:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@bg_color, 1.06)),
                                     to (shade (@bg_color, 1.0)));

    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (shade (@bg_color, 0.9)),
                                           to (shade (@bg_color, 0.86)));
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@bg_color, 1.09)),
                                                 to (shade (@bg_color, 1.03)));
}

column-header:nth-child(last) .button:backdrop {
    border-width: 0 0 1px 0;
}

/******************
 * combobox entry *
 ******************/
GtkComboBox.combobox-entry .button:backdrop,
GtkComboBox.combobox-entry .button:hover:backdrop,
GtkComboBox.combobox-entry .button:active:backdrop,
GtkComboBox.combobox-entry .button:insensitive:backdrop {
    border-top-color: shade (@bg_color, 0.64);
    border-right-color: shade (@bg_color, 0.8);
    border-bottom-color: shade (@bg_color, 0.86);
    border-left-color: shade (@bg_color, 0.76);
}

/*********
 * entry *
 *********/
.entry:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (mix (shade (@base_color, 0.98), @bg_color, 0.4)),
                                     to (mix (@base_color, @bg_color, 0.4)));
    border-top-color: shade (@bg_color, 0.72);
    border-right-color: shade (@bg_color, 0.82);
    border-bottom-color: shade (@bg_color, 0.88);
    border-left-color: shade (@bg_color, 0.82);

    color: mix (@fg_color, @base_color, 0.2);

    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (alpha (shade (@bg_color, 0.05), 0.02)),
                                                 to (alpha (shade (@bg_color, 0.05), 0.01)));
}

.entry:selected:backdrop,
.entry:selected:focused:backdrop {
    background-color: @backdrop_selected_bg_color;

    color: @backdrop_selected_fg_color;
}

.entry:focused:backdrop {
    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (shade (@backdrop_selected_bg_color, 0.75)),
                                           to (shade (@backdrop_selected_bg_color, 0.8)));
    -unico-inner-stroke-color: alpha (@backdrop_selected_bg_color, 0.3);
    -unico-inner-stroke-gradient: none;
}

.entry:insensitive:backdrop {
    background-color: shade (@bg_color, 0.98);
    background-image: none;

    color: mix (@text_color, @base_color, 0.5);

    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (alpha (shade (@bg_color, 0.05), 0.02)),
                                                 to (alpha (shade (@bg_color, 0.05), 0.01)));
}

/************
 * expander *
 ************/
.expander:backdrop {
}

/*********
 * frame *
 *********/
.frame:backdrop {
}

/************
 * iconview *
 ************/
GtkIconView.view.cell:selected:backdrop,
GtkIconView.view.cell:selected:focused:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@backdrop_selected_bg_color, 1.0)),
                                     to (shade (@backdrop_selected_bg_color, 0.9)));
    border-radius: 4px;
    border-style: solid;
    border-width: 1px;

    color: @backdrop_selected_fg_color;

    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (shade (@backdrop_selected_bg_color, 0.7)),
                                           to (shade (@backdrop_selected_bg_color, 0.7)));
    -unico-glow-radius: 8;
    -unico-glow-color: shade (@backdrop_selected_bg_color, 1.3);
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@backdrop_selected_bg_color, 1.2)),
                                                 to (shade (@backdrop_selected_bg_color, 1.08)));
    -unico-inner-stroke-width: 1px;
}

.rubberband:backdrop {
    background-color: alpha (@backdrop_selected_bg_color, 0.35);
    border-color: @backdrop_selected_bg_color;
    border-radius: 0;
    border-style: solid;
    border-width: 1px;
}

/***********
 * infobar *
 ***********/
.info:backdrop {
}

.warning:backdrop {
}

.question:backdrop {
}

.error:backdrop {
}

/***********
 * menubar *
 ***********/
.menubar:backdrop,
.menubar .menuitem:backdrop {
    color: shade (#a39e9a, 0.86); /* metacity unfocused color */
}

/************
 * notebook *
 ************/
.notebook:backdrop {
    background-color: shade (@bg_color, 1.01);
}

/*************************
 * progressbar and scale *
 *************************/
.scale.highlight.left:backdrop,
.progressbar:backdrop,
.progressbar row:backdrop,
.progressbar row:hover:backdrop,
.progressbar row:selected:backdrop,
.progressbar row:selected:focused:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@backdrop_selected_bg_color, 1.05)),
                                     to (shade (@backdrop_selected_bg_color, 0.95)));
    border-width: 1px;

    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (shade (@backdrop_selected_bg_color, 0.8)),
                                           to (shade (@backdrop_selected_bg_color, 0.8)));
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@backdrop_selected_bg_color, 1.07)),
                                                 to (shade (@backdrop_selected_bg_color, 0.965)));
    -unico-outer-stroke-color: @transparent;
    -unico-outer-stroke-gradient: none;
    -unico-outer-stroke-width: 0;
}

.scale.highlight.bottom:backdrop,
.progressbar.vertical:backdrop {
    background-image: -gtk-gradient (linear, left top, right top,
                                    from (shade (@backdrop_selected_bg_color, 1.05)),
                                    to (shade (@backdrop_selected_bg_color, 0.95)));

    -unico-border-gradient: -gtk-gradient (linear, left top, right top,
                                           from (shade (@backdrop_selected_bg_color, 0.86)),
                                           to (shade (@backdrop_selected_bg_color, 0.86)));
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, right top,
                                                 from (shade (@backdrop_selected_bg_color, 1.07)),
                                                 to (shade (@backdrop_selected_bg_color, 0.965)));
}

.scale.highlight.left:insensitive:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@bg_color, 0.98)),
                                     to (shade (@bg_color, 0.88)));

    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (shade (@bg_color, 0.82)),
                                           to (shade (@bg_color, 0.82)));
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@bg_color, 1.0)),
                                                 to (shade (@bg_color, 0.90)));
}

.scale.highlight.bottom:insensitive:backdrop {
    background-image: -gtk-gradient (linear, left top, right top,
                                     from (shade (@bg_color, 0.98)),
                                     to (shade (@bg_color, 0.88)));

    -unico-border-gradient: -gtk-gradient (linear, left top, right top,
                                           from (shade (@bg_color, 0.82)),
                                           to (shade (@bg_color, 0.82)));
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, right top,
                                                 from (shade (@bg_color, 1.0)),
                                                 to (shade (@bg_color, 0.90)));
}

.trough:backdrop,
.trough row:backdrop,
.trough row:hover:backdrop,
.trough row:selected:backdrop,
.trough row:selected:focused:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@bg_color, 0.94)),
                                     to (shade (@bg_color, 0.98)));

    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (shade (@bg_color, 0.85)),
                                           to (shade (@bg_color, 1.05)));
}

.trough.vertical:backdrop {
    background-image: -gtk-gradient (linear, left top, right top,
                                     from (shade (@bg_color, 0.94)),
                                     to (shade (@bg_color, 0.98)));

    -unico-border-gradient: -gtk-gradient (linear, left top, right top,
                                           from (shade (@bg_color, 0.85)),
                                           to (shade (@bg_color, 1.05)));
}

GtkScale.slider:backdrop {
    background-image: url("assets/slider_backdrop.png");
}

GtkScale.slider:hover:backdrop {
    background-image: url("assets/slider_prelight.png");
}

GtkScale.slider:insensitive:backdrop {
    background-image: url("assets/slider_insensitive_backdrop.png");
}

GtkScale.slider.vertical:backdrop {
    background-image: url("assets/slider_vertical_backdrop.png");
}

GtkScale.slider.vertical:hover:backdrop {
    background-image: url("assets/slider_prelight_vertical.png");
}

GtkScale.slider.vertical:insensitive:backdrop {
    background-image: url("assets/slider_vertical_insensitive_backdrop.png");
}

GtkScale.mark:backdrop {
}

/*******************
 * scrolled window *
 *******************/
GtkScrolledWindow.frame:backdrop {
}

/*************
 * separator *
 *************/
.separator:backdrop {
    border-color: shade (@bg_color, 0.92);

    -unico-inner-stroke-color: alpha (shade (@bg_color, 1.26), 0.4);
}

.button .separator:backdrop,
.button.separator:backdrop {
    border-color: shade (@bg_color, 0.86);

    -unico-inner-stroke-color: alpha (shade (@bg_color, 1.26), 0.5);
}

.notebook .button .separator:backdrop,
.notebook .button.separator:backdrop {
    border-color: shade (@bg_color, 0.86);

    -unico-inner-stroke-color: alpha (shade (@bg_color, 1.26), 0.5);
}

.button .separator:insensitive:backdrop,
.button.separator:insensitive:backdrop {
    border-color: shade (@bg_color, 0.92);

    -unico-inner-stroke-color: alpha (shade (@bg_color, 1.26), 0.6);
}

.notebook .button .separator:insensitive:backdrop,
.notebook .button.separator:insensitive:backdrop {
    border-color: shade (@bg_color, 0.92);

    -unico-inner-stroke-color: alpha (shade (@bg_color, 1.26), 0.6);
}

/***********
 * sidebar *
 ***********/
.sidebar row:selected:backdrop {
    text-shadow: 0 1px shade (@backdrop_selected_bg_color, 0.7);
}

/**************
 * spinbutton *
 **************/
.spinbutton.button:backdrop,
.notebook .spinbutton.button:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@bg_color, 1.06)),
                                     to (shade (@bg_color, 0.94)));
    border-top-color: shade (@bg_color, 0.72);
    border-right-color: shade (@bg_color, 0.82);
    border-bottom-color: shade (@bg_color, 0.88);
    border-left-color: shade (@bg_color, 0.82);

    -unico-border-gradient: none;
}

/***********
 * spinner *
 ***********/
.menu.spinner:backdrop,
.primary-toolbar .spinner:backdrop,
.primary-toolbar .spinner:backdrop,
.menubar.toolbar .spinner:backdrop,
.menubar.toolbar .spinner:backdrop,
.header-bar .spinner:backdrop,
.header-bar .spinner:backdrop {
    color: @backdrop_selected_bg_color;
}

/*************
 * statusbar *
 *************/
GtkStatusbar:backdrop {
}

/**********
 * switch *
 **********/
GtkSwitch:backdrop {
    border-radius: 4px;
    padding: 0;

    -unico-focus-border-radius: 4;
    -unico-focus-border-color: alpha (@backdrop_selected_bg_color, 0.3);
    -unico-focus-fill-color: @transparent;
}

GtkSwitch.trough:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@bg_color, 0.89)),
                                     to (shade (@bg_color, 0.96)));

    color: mix (@fg_color, @bg_color, 0.17);
    text-shadow: 0 1px alpha (shade (@bg_color, 1.25), 0.3);

    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (shade (@bg_color, 0.75)),
                                           to (shade (@bg_color, 0.78)));
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@bg_color, 0.85)),
                                                 to (shade (@bg_color, 0.92)));
}

GtkSwitch.trough:active:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@backdrop_selected_bg_color, 0.93)),
                                     to (shade (@backdrop_selected_bg_color, 0.99)));

    color: @backdrop_selected_fg_color;
    text-shadow: 0 1px alpha (shade (@backdrop_selected_bg_color, 1.25), 0.4);

    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (shade (@backdrop_selected_bg_color, 0.75)),
                                           to (shade (@backdrop_selected_bg_color, 0.78)));
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@backdrop_selected_bg_color, 0.86)),
                                                 to (shade (@backdrop_selected_bg_color, 0.94)));
}

GtkSwitch.trough:insensitive:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@bg_color, 0.95)),
                                     to (shade (@bg_color, 0.99)));

    color: mix (shade (@bg_color, 0.6), @bg_color, 0.17);
    text-shadow: 0 1px alpha (shade (@bg_color, 1.25), 0.5);

    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (shade (@bg_color, 0.8)),
                                           to (shade (@bg_color, 0.84)));
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@bg_color, 0.91)),
                                                 to (shade (@bg_color, 0.965)));
}

GtkSwitch.slider:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@bg_color, 1.06)),
                                     to (shade (@bg_color, 0.94)));

    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (shade (@bg_color, 0.75)),
                                           to (shade (@bg_color, 0.78)));
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@bg_color, 1.08)),
                                                 to (shade (@bg_color, 0.96)));
}

GtkSwitch.slider:insensitive:backdrop {
    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (shade (@bg_color, 0.8)),
                                           to (shade (@bg_color, 0.84)));
}

/************
 * textview *
 ************/
GtkTextView:backdrop {
    background-color: mix (@base_color, @bg_color, 0.4);
}

/***********
 * toolbar *
 ***********/
.toolbar:backdrop {
    border-style: none;
}

/* primary-toolbar */
.primary-toolbar:backdrop,
.primary-toolbar .toolbar:backdrop,
.primary-toolbar.toolbar:backdrop,
.menubar.toolbar .toolbar:backdrop,
.menubar.toolbar.toolbar:backdrop,
.header-bar .toolbar:backdrop,
.header-bar.toolbar:backdrop {
    background-color: @dark_bg_color;
    background-image: none;
    border-bottom-color: shade (@dark_bg_color, 0.94);
    border-style: solid;
    border-width: 0 0 1px 0;
    padding: 2px;

    color: shade (#a39e9a, 0.86); /* metacity unfocused color */
    text-shadow: 0 1px shade (@dark_bg_color, 1.06);

    -unico-border-gradient: none;
    -unico-inner-stroke-gradient: none;
    -unico-inner-stroke-width: 0;
}

.primary-toolbar :insensitive:backdrop,
.menubar.toolbar :insensitive:backdrop,
.header-bar :insensitive:backdrop {
    text-shadow: 0 -1px shade (@dark_bg_color, 0.82);
}

.primary-toolbar GtkComboBox:backdrop,
.primary-toolbar .button *:backdrop,
.primary-toolbar .button:backdrop,
.menubar.toolbar GtkComboBox:backdrop,
.menubar.toolbar .button *:backdrop,
.menubar.toolbar .button:backdrop,
.header-bar GtkComboBox:backdrop,
.header-bar .button *:backdrop,
.header-bar .button:backdrop {
    background-color: @transparent;
    background-image: none;
    border-color: @transparent;
    border-radius: 3px;
    border-width: 1px;
    padding: 2px;

    color: shade (#a39e9a, 0.86); /* metacity unfocused color */
    text-shadow: 0 1px shade (@dark_bg_color, 1.06);

    /* This breaks Gtk+ 3.5.x, lp #1015497. */
    /* transition: 0ms ease-in-out; */

    -unico-focus-border-radius: 4;
    -unico-focus-border-color: alpha (@backdrop_selected_bg_color, 0.5);
    -unico-focus-fill-color: alpha (@backdrop_selected_bg_color, 0.2);
    -unico-focus-outer-stroke-color: @transparent;

    -unico-border-gradient: none;
    -unico-glow-radius: 0;
    -unico-inner-stroke-width: 0;
    -unico-outer-stroke-width: 0;
}

.primary-toolbar .button *:hover:backdrop,
.menubar.toolbar .button *:hover:backdrop,
.header-bar .button *:hover:backdrop {
    color: shade (shade (#a39e9a, 0.86), 1.1);
}

.primary-toolbar .raised .button:backdrop,
.primary-toolbar .raised.button:backdrop,
.primary-toolbar .button:hover:backdrop,
.primary-toolbar .button:active:backdrop,
.primary-toolbar .button:insensitive:backdrop,
.menubar.toolbar .raised .button:backdrop,
.menubar.toolbar .raised.button:backdrop,
.menubar.toolbar .button:hover:backdrop,
.menubar.toolbar .button:active:backdrop,
.menubar.toolbar .button:insensitive:backdrop,
.header-bar .raised .button:backdrop,
.header-bar .raised.button:backdrop,
.header-bar .button:hover:backdrop,
.header-bar .button:active:backdrop,
.header-bar .button:insensitive:backdrop {
    border-width: 1px;

    /* This breaks Gtk+ 3.5.x, lp #1015497. */
    /* transition: 0ms ease-in-out; */

    -unico-focus-border-radius: 0;
    -unico-focus-fill-color: @transparent;
    -unico-focus-border-color: @transparent;
    -unico-focus-outer-stroke-color: @transparent;

    -unico-inner-stroke-width: 1px;
    -unico-outer-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@dark_bg_color, 1.01)),
                                                 to (shade (@dark_bg_color, 1.06)));
    -unico-outer-stroke-width: 1px;
}

.primary-toolbar GtkComboBox.combobox-entry .button:backdrop,
.menubar.toolbar GtkComboBox.combobox-entry .button:backdrop,
.header-bar GtkComboBox.combobox-entry .button:backdrop {
    -unico-inner-stroke-width: 1px;
    -unico-outer-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@dark_bg_color, 1.01)),
                                                 to (shade (@dark_bg_color, 1.06)));
}

.primary-toolbar GtkComboBox.combobox-entry .button:backdrop,
.primary-toolbar .raised .button:backdrop,
.primary-toolbar .raised.button:backdrop,
.primary-toolbar .button:hover:backdrop,
.menubar.toolbar GtkComboBox.combobox-entry .button:backdrop,
.menubar.toolbar .raised .button:backdrop,
.menubar.toolbar .raised.button:backdrop,
.menubar.toolbar .button:hover:backdrop,
.header-bar GtkComboBox.combobox-entry .button:backdrop,
.header-bar .raised .button:backdrop,
.header-bar .raised.button:backdrop,
.header-bar .button:hover:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@dark_bg_color, 1.06)),
                                     to (shade (@dark_bg_color, 0.98)));

    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (shade (@dark_bg_color, 0.9)),
                                           to (shade (@dark_bg_color, 0.87)));
    -unico-glow-radius: 0;
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@dark_bg_color, 1.12)),
                                                 to (shade (@dark_bg_color, 1.02)));
}

.primary-toolbar .button:active:backdrop,
.menubar.toolbar .button:active:backdrop,
.header-bar .button:active:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@dark_bg_color, 0.9)),
                                     to (shade (@dark_bg_color, 0.95)));

    text-shadow: 0 1px shade (@dark_bg_color, 0.95);

    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (shade (@dark_bg_color, 0.75)),
                                           to (shade (@dark_bg_color, 0.85)));
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@dark_bg_color, 0.88)),
                                                 to (shade (@dark_bg_color, 0.93)))
}

.primary-toolbar .button:active:hover:backdrop,
.menubar.toolbar .button:active:hover:backdrop,
.header-bar .button:active:hover:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@dark_bg_color, 0.95)),
                                     to (shade (@dark_bg_color, 1.0)));

    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (shade (@dark_bg_color, 0.75)),
                                           to (shade (@dark_bg_color, 0.85)));
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@dark_bg_color, 0.93)),
                                                 to (shade (@dark_bg_color, 0.94)))
}

.primary-toolbar .button:active:insensitive:backdrop,
.primary-toolbar .button:insensitive:backdrop,
.menubar.toolbar .button:active:insensitive:backdrop,
.menubar.toolbar .button:insensitive:backdrop,
.header-bar .button:active:insensitive:backdrop,
.header-bar .button:insensitive:backdrop {
    text-shadow: none;

    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (shade (@dark_bg_color, 0.85)),
                                           to (shade (@dark_bg_color, 0.95)));
    -unico-glow-radius: 0;
    -unico-outer-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@dark_bg_color, 1.01)),
                                                 to (shade (@dark_bg_color, 1.06)));
}

.primary-toolbar .button:insensitive:backdrop,
.menubar.toolbar .button:insensitive:backdrop,
.header-bar .button:insensitive:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@dark_bg_color, 1.01)),
                                     to (shade (@dark_bg_color, 0.99)));

    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@dark_bg_color, 1.1)),
                                                 to (shade (@dark_bg_color, 1.04)));
}

.primary-toolbar .button:active:insensitive:backdrop,
.menubar.toolbar .button:active:insensitive:backdrop,
.header-bar .button:active:insensitive:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@dark_bg_color, 0.94)),
                                     to (shade (@dark_bg_color, 1.02)));

    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@dark_bg_color, 0.92)),
                                                 to (shade (@dark_bg_color, 1.0)));
}

.primary-toolbar .entry:backdrop,
.primary-toolbar .entry:active:backdrop,
.primary-toolbar .entry:focused:backdrop,
.menubar.toolbar .entry:backdrop,
.menubar.toolbar .entry:active:backdrop,
.menubar.toolbar .entry:focused:backdrop,
.header-bar .entry:backdrop,
.header-bar .entry:active:backdrop,
.header-bar .entry:focused:backdrop {
    border-radius: 3px;

    color: @text_color;

    -unico-outer-stroke-width: 1px;
    -unico-outer-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@dark_bg_color, 1.01)),
                                                 to (shade (@dark_bg_color, 1.06)));
}

.primary-toolbar .entry:backdrop,
.menubar.toolbar .entry:backdrop,
.header-bar .entry:backdrop {
    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (shade (@dark_bg_color, 0.75)),
                                           to (shade (@dark_bg_color, 0.95)));
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (alpha (shade (@bg_color, 0.05), 0.02)),
                                                 to (alpha (shade (@bg_color, 0.05), 0.01)));
}

.primary-toolbar .entry:insensitive:backdrop,
.menubar.toolbar .entry:insensitive:backdrop,
.header-bar .entry:insensitive:backdrop {
    -unico-outer-stroke-width: 1px;
    -unico-outer-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@dark_bg_color, 1.01)),
                                                 to (shade (@dark_bg_color, 1.06)));
}

.primary-toolbar .entry:focused:backdrop,
.menubar.toolbar .entry:focused:backdrop,
.header-bar .entry:focused:backdrop {
    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (shade (@backdrop_selected_bg_color, 0.75)),
                                           to (shade (@backdrop_selected_bg_color, 0.8)));
    -unico-inner-stroke-color: alpha (@backdrop_selected_bg_color, 0.2);
    -unico-inner-stroke-gradient: none;
}

.primary-toolbar GtkSeparatorToolItem:backdrop,
.primary-toolbar .separator:backdrop,
.primary-toolbar .separator:insensitive:backdrop,
.menubar.toolbar GtkSeparatorToolItem:backdrop,
.menubar.toolbar .separator:backdrop,
.menubar.toolbar .separator:insensitive:backdrop,
.header-bar GtkSeparatorToolItem:backdrop,
.header-bar .separator:backdrop,
.header-bar .separator:insensitive:backdrop {
    border-color: shade (@dark_bg_color, 0.94);
    border-style: solid;

    -unico-border-gradient: none;
    -unico-inner-stroke-color: shade (@dark_bg_color, 1.04);
    -unico-inner-stroke-gradient: none;
}

/* inline-toolbar */
.inline-toolbar.toolbar:backdrop {
    -GtkToolbar-button-relief: normal;

    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (#f2f1ef, 0.96)),
                                     color-stop (0.08, #f2f1ef),
                                     to (#ffffff));
    border-radius: 0;
    border-style: solid;
    border-width: 1px;
    padding: 3px 4px 4px 4px;
}

.inline-toolbar.toolbar:nth-child(last):backdrop {
    border-bottom-color: shade (@bg_color, 0.76);
    border-color: shade (@bg_color, 0.8);
    border-radius: 0 0 3px 3px;
    border-width: 0 1px 1px 1px;
}

.inline-toolbar.toolbar .button:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@bg_color, 1.06)),
                                     to (shade (@bg_color, 0.94)));
    border-radius: 0;
    border-style: solid;
    border-width: 1px 0 1px 1px;
    padding: 1px;

    icon-shadow: 0 1px shade (@bg_color, 1.16);

    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@bg_color, 1.09)),
                                                 to (shade (@bg_color, 0.97)));
    -unico-outer-stroke-width: 1px 0 1px 0;
    -unico-outer-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (alpha (shade (@bg_color, 0.05), 0.01)),
                                                 to (alpha (shade (@bg_color, 0.05), 0.03)));
}

.inline-toolbar.toolbar .button *:active:backdrop,
.inline-toolbar.toolbar .button *:insensitive:backdrop,
.inline-toolbar.toolbar GtkToolButton .button:active:backdrop,
.inline-toolbar.toolbar GtkToolButton .button:insensitive:backdrop {
    -unico-outer-stroke-width: 1px 0 1px 0;
    -unico-outer-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (alpha (shade (@bg_color, 0.05), 0.008)),
                                                 to (alpha (shade (@bg_color, 0.05), 0.01)));
}

.inline-toolbar.toolbar .button *:insensitive:backdrop,
.inline-toolbar.toolbar GtkToolButton .button:insensitive:backdrop {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@bg_color, 1.02)),
                                     to (shade (@bg_color, 0.98)));

    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (shade (@bg_color, 0.85)),
                                           to (shade (@bg_color, 0.8)));
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@bg_color, 1.16)),
                                                 to (shade (@bg_color, 1.0)));
}

.inline-toolbar.toolbar .button:nth-child(first):backdrop,
.inline-toolbar.toolbar GtkToolButton:nth-child(first) .button:backdrop {
    border-radius: 3px 0 0 3px;

    -unico-outer-stroke-width: 1px 0 1px 1px;
}

.inline-toolbar.toolbar .button:nth-child(last):backdrop,
.inline-toolbar.toolbar GtkToolButton:nth-child(last) .button:backdrop {
    border-radius: 0 3px 3px 0;
    border-width: 1px;

    -unico-outer-stroke-width: 1px 1px 1px 0;
}

/************
 * treeview *
 ************/
GtkTreeView .entry:backdrop {
}

/************
 * viewport *
 ************/
GtkViewport.frame:backdrop {
}

/*****************************************************************************
 * states [please keep this section at the end of the file (CSS precedence)] *
 *****************************************************************************/
*:insensitive:backdrop {
    color: mix (shade (@bg_color, 0.6), @bg_color, 0.2);
    text-shadow: 0 1px alpha (shade (@bg_color, 1.25), 0.5);
}

*:selected:backdrop,
*:selected:focused:backdrop {
    background-color: @backdrop_selected_bg_color;

    color: @backdrop_selected_fg_color;
}