_theme.scss
    
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            $dark-theme: false !default; 
        
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            $light-topbar: false !default; 
        
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            $compact: false !default; 
        
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            $toolkit: "none" !default; 
        
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            $asset-suffix: if($dark-theme, "-dark", ""); 
        
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            // 
        
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            // Sizes 
        
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            // 
        
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            $container-padding: 6px; 
        
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            $small-size: 24px; 
        
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            $medium-size: 36px; 
        
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            $large-size: 48px; 
        
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            @if $compact { 
        
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              $container-padding: 4px; 
        
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              $small-size: 24px; 
        
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              $medium-size: 32px; 
        
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              $large-size: 40px; 
        
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            } 
        
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            $bar-size: 4px; 
        
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            $menuitem-size: 28px; 
        
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            // 
        
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            // Radii 
        
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            // 
        
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            $corner-radius: 4px; 
        
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            $circular-radius: 9999px; 
        
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            // 
        
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            // Durations 
        
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            // 
        
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            $duration: 75ms; 
        
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            $ripple-fade-in-duration: 225ms; 
        
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            $ripple-fade-out-duration: 300ms; 
        
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            $ripple-fade-out-opacity-duration: 1200ms; 
        
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            // 
        
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            // Timing functions 
        
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            // 
        
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            $ease: cubic-bezier(.4, 0, .2, 1); 
        
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            $ease-out: cubic-bezier(0, 0, .2, 1); 
        
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            $ease-in: cubic-bezier(.4, 0, 1, 1); 
        
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            $ease-in-out: cubic-bezier(.4, 0, .6, 1); 
        
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            // 
        
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            // Transition shorthands 
        
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            // 
        
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            $transition: all $duration $ease-out; 
        
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            $transition-shadow: box-shadow $duration $ease-out; 
        
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            // 
        
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            // Shadows 
        
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            // 
        
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            // Values are based on: 
        
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            // https://github.com/material-components/material-components-web/blob/master/packages/mdc-elevation/_elevation-theme.scss 
        
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            $shadow-z1: 
        
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              0 2px 1px -1px rgba(black, .2), 
        
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              0 1px 1px 0 rgba(black, .14), 
        
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              0 1px 3px 0 rgba(black, .12); 
        
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            $shadow-z2: 
        
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              0 3px 1px -2px rgba(black, .2), 
        
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              0 2px 2px 0 rgba(black, .14), 
        
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              0 1px 5px 0 rgba(black, .12); 
        
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            $shadow-z3: 
        
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              0 3px 3px -2px rgba(black, .2), 
        
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              0 3px 4px 0 rgba(black, .14), 
        
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              0 1px 8px 0 rgba(black, .12); 
        
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            $shadow-z4: 
        
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              0 2px 4px -1px rgba(black, .2), 
        
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              0 4px 5px 0 rgba(black, .14), 
        
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              0 1px 10px 0 rgba(black, .12); 
        
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            $shadow-z6: 
        
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              0 3px 5px -1px rgba(black, .2), 
        
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              0 6px 10px 0 rgba(black, .14), 
        
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              0 1px 18px 0 rgba(black, .12); 
        
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            $shadow-z8: 
        
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              0 5px 5px -3px rgba(black, .2), 
        
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              0 8px 10px 1px rgba(black, .14), 
        
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              0 3px 14px 2px rgba(black, .12); 
        
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            $shadow-z12: 
        
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              0 7px 8px -4px rgba(black, .2), 
        
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              0 12px 17px 2px rgba(black, .14), 
        
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              0 5px 22px 4px rgba(black, .12); 
        
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            $shadow-z16: 
        
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              0 8px 10px -5px rgba(black, .2), 
        
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              0 16px 24px 2px rgba(black, .14), 
        
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              0 6px 30px 5px rgba(black, .12); 
        
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            $shadow-z24: 
        
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              0 11px 15px -7px rgba(black, .2), 
        
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              0 24px 38px 3px rgba(black, .14), 
        
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              0 9px 46px 8px rgba(black, .12); 
        
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            $text-shadow: 
        
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              0 1px 1px rgba(black, .2), 
        
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              0 1px 2px rgba(black, .14), 
        
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              0 1px 3px rgba(black, .12); 
        
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            // workaround for selection-mode checkboxes 
        
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            $icon-shadow-z2: 
        
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              0 1px 1px rgba(black, .2), 
        
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              0 2px 2px rgba(black, .14), 
        
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              0 1px 5px rgba(black, .12); 
        
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            $icon-shadow-z4: 
        
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              0 2px 3px rgba(black, .2), 
        
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              0 4px 5px rgba(black, .14), 
        
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              0 1px 10px rgba(black, .12); 
        
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            // Note that GTK 3 does not support blur below 2px, 
        
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            // and its blur is huge compared to web rendering. 
        
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            // See: https://gitlab.gnome.org/GNOME/gtk/issues/511 
        
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            @if $toolkit == "gtk3" { 
        
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              $shadow-z1: 
        
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                0 2px 2px -2px rgba(black, .3), 
        
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                0 1px 2px -1px rgba(black, .24), 
        
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                0 1px 2px -.6px rgba(black, .17); 
        
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              $shadow-z2: 
        
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                0 3px 2px -3px rgba(black, .3), 
        
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                0 2px 2px -1px rgba(black, .24), 
        
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                0 1px (5px * .6) 0 rgba(black, .12); 
        
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              $shadow-z3: 
        
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                0 3px 2px -2px rgba(black, .2), 
        
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                0 3px (4px * .6) 0 rgba(black, .14), 
        
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                0 1px (8px * .6) 0 rgba(black, .12); 
        
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              $shadow-z4: 
        
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                0 2px (4px * .6) -1px rgba(black, .2), 
        
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                0 4px (5px * .6) 0 rgba(black, .14), 
        
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                0 1px (10px * .6) 0 rgba(black, .12); 
        
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              $shadow-z6: 
        
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                0 3px (5px * .6) -1px rgba(black, .2), 
        
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                0 6px (10px * .6) 0 rgba(black, .14), 
        
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                0 1px (18px * .6) 0 rgba(black, .12); 
        
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              $shadow-z8: 
        
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                0 5px (5px * .6) -3px rgba(black, .2), 
        
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                0 8px (10px * .6) 1px rgba(black, .14), 
        
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                0 3px (14px * .6) 2px rgba(black, .12); 
        
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              $shadow-z12: 
        
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                0 7px (8px * .6) -4px rgba(black, .2), 
        
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                0 12px (17px * .6) 2px rgba(black, .14), 
        
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                0 5px (22px * .6) 4px rgba(black, .12); 
        
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              $shadow-z16: 
        
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                0 8px (10px * .6) -5px rgba(black, .2), 
        
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                0 16px (24px * .6) 2px rgba(black, .14), 
        
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                0 6px (30px * .6) 5px rgba(black, .12); 
        
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              $shadow-z24: 
        
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                0 11px (15px * .6) -7px rgba(black, .2), 
        
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                0 24px (38px * .6) 3px rgba(black, .14), 
        
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                0 9px (46px * .6) 8px rgba(black, .12); 
        
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              $text-shadow: 
        
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                0 1px 1px rgba(black, .2), 
        
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                0 1px 2px rgba(black, .14), 
        
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                0 1px 3px rgba(black, .12); 
        
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              $icon-shadow-z2: 
        
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                0 1px 1px rgba(black, .2), 
        
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                0 2px 2px rgba(black, .14), 
        
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                0 1px (5px * .6) rgba(black, .12); 
        
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              $icon-shadow-z4: 
        
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                0 2px 2px rgba(black, .2), 
        
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                0 4px (5px * .6) rgba(black, .14), 
        
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                0 1px (10px * .6) rgba(black, .12); 
        
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            } 
        
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            @if $toolkit == "st" { 
        
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              $shadow-z1: 0 1px 1px rgba(black, .36); 
        
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              $shadow-z2: 0 1px 2px rgba(black, .4); 
        
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              $shadow-z4: 0 2px 8px rgba(black, .44); 
        
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              $shadow-z8: 0 5px 16px rgba(black, .5); 
        
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              $shadow-z16: 0 8px 24px rgba(black, .68); // TODO 
        
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            } 
        
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