GHI-#36 Implement the LESSCSS styles and variables

index.less

@@ -15,6 +15,7 @@ copyright  Copyright (C) 2016                              +
   > Package Support
       Community
       Core
+  > Theme Settings
 
 [References]
 Nord
@@ -70,3 +71,8 @@ LESSCSS
 @import "styles/package-support/minimap";
 @import "styles/package-support/project-manager";
 @import "styles/package-support/timecop";
+
+/*+----------------+
+  + Theme Settings +
+  +----------------+*/
+@import "styles/ui-theme-settings";

styles/ui-theme-settings.less

@@ -0,0 +1,43 @@
+/*
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+title      UI Theme Settings                               +
+project    nord-atom-ui                                    +
+version                                                    +
+repository https://github.com/arcticicestudio/nord-atom-ui +
+author     Arctic Ice Studio                               +
+email      [email protected]                 +
+copyright  Copyright (C) 2016                              +
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+[Index]
+  > Variables
+  > User Interface
+      Full-Width Tab Sizing
+*/
+/*+-----------+
+  + Variables +
+  +-----------+*/
+@theme-setting-tabsizing: ~'theme-@{ui-theme-name}-tabsizing';
+
+/*+----------------+
+  + User Interface +
+  +----------------+*/
+/*+--- Full Width Tab Sizing ---+*/
+[@{theme-setting-tabsizing}="nofullwidth"] {
+  .theme-setting-tabsizing-nofullwidth();
+}
+
+.theme-setting-tabsizing-nofullwidth() {
+  .tab-bar {
+    width: auto;
+
+    .tab {
+      width: inherit;
+    }
+
+    .tab.active,
+    .tab:hover.active {
+      width: inherit;
+    }
+  }
+}

styles/ui-variables.less

@@ -45,6 +45,7 @@ copyright  Copyright (C) 2016                              +
 /*+------------+
   + Animations +
   +------------+*/
+@ui-theme-name: nord-atom-ui;
 @transition-time: 400ms;
 
 /*+------+