chore: SASS clean up

src/sass/lib/css-vars.scss

@@ -1,5 +1,8 @@
 // Downloaded from https://github.com/malyw/css-vars (and modified)
 
+@use 'sass:list';
+@use 'sass:map';
+
 // global map to be filled via variables
 $css-vars: ();
 
@@ -21,36 +24,35 @@ $css-vars-use-native: false !default;
 
 ///
 // Emulates var() CSS native function behavior
-//
 // $args[0] {String} "--" + variable name
 // [$args[1]] Optional default value if variable is not assigned yet
-//
 // E.G.:
 // color: var(--main-color);
 // background: var(--main-background, green);
 ///
 @function var($args...) {
   // CHECK PARAMS
-  @if (length($args) ==0) {
+  @if length($args) == 0 {
     @error 'Variable name is expected to be passed to the var() function';
   }
-  @if (str-length(nth($args, 1)) < 2 or str-slice(nth($args, 1), 0, 2) != '--') {
+
+  @if str-length(nth($args, 1)) < 2 or str-slice(nth($args, 1), 0, 2) != '--' {
     @error "Variable name is expected to start from '--'";
   }
 
   // PROCESS
-  $var-name: nth($args, 1);
-  $var-value: map-get($css-vars, $var-name);
+  $var-name: list.nth($args, 1);
+  $var-value: map.get($css-vars, $var-name);
 
-  @if ($css-vars-use-native) {
+  @if $css-vars-use-native {
     // CSS variables
     // Native CSS: don't process function in case of native
     @return unquote('var(' + $args + ')');
   } @else {
-    @if ($var-value == null) {
+    @if not $var-value {
       // variable is not provided so far
-      @if (length($args) == 2) {
-        $var-value: nth($args, 2);
+      @if length($args) == 2 {
+        $var-value: list.nth($args, 2);
       }
     }
 
@@ -70,20 +72,21 @@ $css-vars-use-native: false !default;
 ///
 @mixin css-vars($var-map: null) {
   // CHECK PARAMS
-  @if ($var-map == null) {
+  @if not $var-map {
     @error 'Map of variables is expected, instead got: null';
   }
-  @if (type_of($var-map) != map) {
+
+  @if type_of($var-map) != map {
     @error 'Map of variables is expected, instead got another type passed: #{type_of($var, ap)}';
   }
 
   // PROCESS
-  @if ($css-vars-use-native) {
+  @if $css-vars-use-native {
     // CSS variables
     // Native CSS: assign CSS custom properties to the global scope
     @at-root :root {
       @each $var-name, $var-value in $var-map {
-        @if (type_of($var-value) == string) {
+        @if type_of($var-value) == string {
           #{$var-name}: $var-value; // to prevent quotes interpolation
         } @else {
           #{$var-name}: #{$var-value};

src/sass/lib/mixins.scss

@@ -5,10 +5,8 @@
 // Nicer focus styles
 // ---------------------------------------
 @mixin plyr-tab-focus($color: $plyr-tab-focus-color) {
-  outline-color: $color;
+  outline: $color dotted 3px;
   outline-offset: 2px;
-  outline-style: dotted;
-  outline-width: 3px;
 }
 
 // Font smoothing