[theme] replace all hardcoded colors by css vars and drop ununsed vars

searx/static/themes/simple/src/less/toolkit.less

@@ -49,8 +49,8 @@ html.js .show_if_nojs {
 
 .badge {
   display: inline-block;
-  color: #fff;
-  background-color: #777;
+  color: var(--color-toolkit-badge-font);
+  background-color: var(--color-toolkit-badge-background);
   text-align: center;
   white-space: nowrap;
   vertical-align: baseline;
@@ -64,8 +64,8 @@ kbd {
   padding: 2px 4px;
   margin: 1px;
   font-size: 90%;
-  color: white;
-  background: black;
+  color: var(--color-toolkit-kbd-font);
+  background: var(--color-toolkit-kbd-background);
 }
 
 // table
@@ -122,7 +122,7 @@ div.selectable_url {
   position: relative;
   padding: 1em 1em 1em 2.7em;
   margin: 0 0 1em 0;
-  border: 1px solid black;
+  border: 1px solid var(--color-toolkit-dialog-border);
   border-radius: 4px;
   text-align: left;
 
@@ -191,7 +191,7 @@ div.selectable_url {
 .dialog-modal {
   .dialog();
 
-  background: white;
+  background: var(--color-toolkit-dialog-background);
   position: fixed;
   top: 50%;
   left: 50%;
@@ -244,7 +244,7 @@ div.selectable_url {
     margin: 0 0.7em;
     letter-spacing: 0.5px;
     text-transform: uppercase;
-    border: solid white;
+    border: solid var(--color-toolkit-tabs-label-border);
     border-width: 0 0 2px 0;
 
     .disable-user-select();
@@ -260,7 +260,7 @@ div.selectable_url {
     min-width: 100%;
     padding: 0.7rem 0;
     box-sizing: border-box;
-    border-top: 1px solid black;
+    border-top: 1px solid var(--color-toolkit-tabs-section-border);
     display: none;
   }
 
@@ -327,7 +327,7 @@ select {
     -webkit-appearance: none;
     -moz-appearance: none;
     border: none;
-    border-bottom: 1px solid #d7d7d7;
+    border-bottom: 1px solid var(--color-toolkit-select-border);
     background: url(data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0idXRmLTgiPz4KPCFET0NUWVBFIHN2ZyBQVUJMSUMgIi0vL1czQy8vRFREIFNWRyAxLjEvL0VOIiAiaHR0cDovL3d3dy53My5vcmcvR3JhcGhpY3MvU1ZHLzEuMS9EVEQvc3ZnMTEuZHRkIj4KPHN2ZyB2ZXJzaW9uPSIxLjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgeD0iMHB4IiB5PSIwcHgiIHdpZHRoPSI1MTJweCIgaGVpZ2h0PSI1MTJweCIgdmlld0JveD0iMCAwIDUxMiA1MTIiIGVuYWJsZS1iYWNrZ3JvdW5kPSJuZXcgMCAwIDUxMiA1MTIiIHhtbDpzcGFjZT0icHJlc2VydmUiPjxnPjxwb2x5Z29uIHBvaW50cz0iMTI4LDE5MiAyNTYsMzIwIDM4NCwxOTIiLz48L2c+PC9zdmc+Cg==) no-repeat;
     background-position-x: 105%;
     background-size: 2em;
@@ -347,7 +347,7 @@ select {
     display: inline-block;
     width: 40px;
     height: 10px;
-    background: #dcdcdc;
+    background: var(--color-toolkit-checkbox-onoff-background);
     margin: 8px 1rem;
     position: relative;
     border-radius: 50px;
@@ -360,10 +360,10 @@ select {
       top: -5px;
       cursor: pointer;
       border-radius: 50px;
-      box-shadow: 0 3px 5px 0 rgba(0, 0, 0, 0.3);
+      box-shadow: 0 3px 5px 0 var(--color-toolkit-checkbox-onoff-label-shadow);
       transition: all 0.4s ease;
       left: 27px;
-      background-color: #3498db;
+      background-color: var(--color-toolkit-checkbox-onoff-label-background);
     }
 
     input[type=checkbox] {
@@ -371,7 +371,7 @@ select {
 
       &:checked + label {
         left: -5px;
-        background: #dcdcdc;
+        background: var(--color-toolkit-checkbox-onoff-checked-background);
       }
     }
   }
@@ -391,9 +391,9 @@ select {
       position: absolute;
       top: 0;
       left: 0;
-      background: white;
+      background: var(--color-toolkit-checkbox-label-background);
       border-radius: 4px;
-      box-shadow: inset 0 1px 1px white, 0 1px 4px rgba(0, 0, 0, 0.5);
+      box-shadow: inset 0 1px 1px var(--color-toolkit-checkbox-label-shadow1), 0 1px 4px var(--color-toolkit-checkbox-label-shadow2);
 
       &::after {
         content: '';
@@ -402,7 +402,7 @@ select {
         position: absolute;
         top: 4px;
         left: 4px;
-        border: 3px solid #333;
+        border: 3px solid var(--color-toolkit-checkbox-label-border);
         border-top: none;
         border-right: none;
         background: transparent;
@@ -415,7 +415,7 @@ select {
       visibility: hidden;
 
       &:checked + label::after {
-        border-color: #3498db;
+        border-color: var(--color-toolkit-checkbox-input-border);
         opacity: 1;
       }
     }
@@ -453,10 +453,10 @@ select {
   font-size: 10px;
   position: relative;
   text-indent: -9999em;
-  border-top: 0.5em solid rgba(0, 0, 0, 0.2);
-  border-right: 0.5em solid rgba(0, 0, 0, 0.2);
-  border-bottom: 0.5em solid rgba(0, 0, 0, 0.2);
-  border-left: 0.5em solid rgba(255, 255, 255, 0);
+  border-top: 0.5em solid var(--color-toolkit-loader-border);
+  border-right: 0.5em solid var(--color-toolkit-loader-border);
+  border-bottom: 0.5em solid var(--color-toolkit-loader-border);
+  border-left: 0.5em solid var(--color-toolkit-loader-borderleft);
   -webkit-transform: translateZ(0);
   -ms-transform: translateZ(0);
   transform: translateZ(0);
@@ -494,9 +494,9 @@ select {
   position: absolute;
   padding: 0.5rem 1rem;
   margin: 0 0 0 2rem;
-  border: 1px solid #ddd;
-  box-shadow: 2px 2px 2px 0 rgba(0, 0, 0, 0.1);
-  background: white;
+  border: 1px solid var(--color-toolkit-engine-tooltip-border);
+  box-shadow: 2px 2px 2px 0 var(--color-toolkit-engine-tooltip-shadow);
+  background: var(--color-toolkit-engine-tooltip-background);
   font-size: 14px;
   font-weight: normal;
   z-index: 1000000;