Add Fabric specific styles and Fluent theme

documentDBFabric.less contains all styles for Fabric.
We use React.lazy to import them conditionally at
runtime preventing webpack from preprocessing
them into main.css.

less/Common/Constants.less

@@ -10,6 +10,7 @@
 @DataExplorerFont: wf_segoe-ui_normal, "Segoe UI", "Segoe WP", Tahoma, Arial, sans-serif;
 @SemiboldFont: "Segoe UI Semibold", "Segoe UI", "Segoe WP", Tahoma, Arial, sans-serif;
 @GrayScale: "grayscale()";
+@NoColor: "brightness(0) saturate(100%)";
 
 @xSmallFontSize: 4px;
 @smallFontSize: 8px;
@@ -147,14 +148,39 @@
 // CommandBar
 @CommandBarButtonHeight: 40px;
 
+/**********************************************************************************
+                              Portal Consts
+/**********************************************************************************/
+
+@PortalAccentMediumHigh: #0058ad;
+@PortalAccentMedium: #004e87;
+@PortalAccentLight: #eef7ff;
+@PortalAccentAccentExtra: #ddf0ff;
+
+/**********************************************************************************
+                              Fabric Consts
+/**********************************************************************************/
+
+@FabricBoxBorderRadius: 8px;
+@FabricBoxBorderShadow: 0 0 2px rgba(0, 0, 0, 0.12), 0 2px 4px rgba(0, 0, 0, 0.14);
+@FabricBoxMargin: 8px;
+
+@FabricAccentMediumHigh: #0c695a;
+@FabricAccentMedium: #117865;
+@FabricAccentLight: #f5f5f5;
+@FabricAccentExtra: #ebebeb;
+
+@FabricButtonBorderRadius: 4px;
+
+
 /**********************************************************************************
                               Common Flex Property
 /**********************************************************************************/
 
 .flex-display(@display: flex) {
-  display: ~"-webkit-@{display}";
-  display: ~"-ms-@{display}box"; // IE10 uses -ms-flexbox
-  display: ~"-ms-@{display}"; // IE11
+  display:~"-webkit-@{display}";
+  display:~"-ms-@{display}box"; // IE10 uses -ms-flexbox
+  display:~"-ms-@{display}"; // IE11
   display: @display;
 }
 
@@ -168,13 +194,15 @@
                                  High contrast mode active
 **************************************************************************************/
 
-@media all and (-ms-high-contrast: none), (-ms-high-contrast: active) {
+@media all and (-ms-high-contrast: none),
+(-ms-high-contrast: active) {
+
   .selectedRadio,
   .selectedRadio:hover,
   .selectedRadio:active,
   .selectedRadio.dirty,
-  .tab [type="radio"]:checked ~ label,
-  .tab [type="radio"]:checked ~ label:hover {
+  .tab [type="radio"]:checked~label,
+  .tab [type="radio"]:checked~label:hover {
     -ms-high-contrast-adjust: none;
     -webkit-text-fill-color: HighlightText;
     color: HighlightText;
@@ -183,6 +211,7 @@
   }
 
   .queryMetricsSummaryTuple {
+
     th,
     td {
       &:nth-child(2) {
@@ -302,4 +331,4 @@
   width: 0;
   height: 0;
   border-color: @InfoPointerColor transparent;
-}
+}

less/documentDBFabric.less

@@ -0,0 +1,144 @@
+@import "./Common/Constants";
+
+body {
+  background-color: #f5f5f5;
+}
+
+#divExplorer {
+  background-color: #f5f5f5;
+}
+
+.resourceTreeAndTabs {
+  border-radius: @FabricBoxBorderRadius;
+  box-shadow: @FabricBoxBorderShadow;
+  margin: @FabricBoxMargin;
+  margin-top: 4px;
+  background-color: #ffffff;
+}
+
+.tabsManagerContainer {
+  background-color: #fafafa
+}
+
+.nav-tabs-margin {
+  padding-top: 8px;
+  background-color: #fafafa
+}
+
+.commandBarContainer {
+  background-color: #ffffff;
+  border-bottom: none;
+  border-radius: @FabricBoxBorderRadius;
+  box-shadow: @FabricBoxBorderShadow;
+  margin: @FabricBoxMargin;
+  padding-top: 2px;
+}
+
+.dividerContainer {
+  padding: @SmallSpace 0px @SmallSpace 0px;
+  .flex-display();
+
+  span {
+    border-left: @ButtonBorderWidth solid @BaseMedium;
+    margin: 0 10px 0 10px;
+  }
+}
+
+.nav-tabs>li.active>.tabNavContentContainer,
+.nav-tabs>li.active>.tabNavContentContainer:focus,
+.nav-tabs>li.active>.tabNavContentContainer:hover {
+  color: #555;
+  cursor: default;
+  background-color: @BaseLight;
+  border-color: @BaseMedium;
+  border-bottom-color: @BaseLight;
+  border-style: solid;
+  border-width: 1px;
+  height: @ActiveTabHeight;
+  width: @ActiveTabWidth;
+}
+
+
+.resourceTree {
+  padding: 12px;
+}
+
+.accordion {
+  .accordionItemContainer {
+    .accordionItemHeader {
+      border-radius: 4px;
+    }
+  }
+}
+
+.treeComponent {
+  .nodeItem {
+    &:focus {
+      outline: 2px @FabricAccentMedium;
+    }
+
+    .treeNodeHeader {
+      padding: 5px 5px;
+      border-radius: 4px;
+
+      &:hover {
+        background-color: @FabricAccentLight;
+
+        .treeMenuEllipsis {
+          opacity: 1;
+        }
+      }
+
+      &.showingMenu {
+        background-color: #eee;
+      }
+    }
+
+    .selected {
+      &>.treeNodeHeader {
+        background-color: @FabricAccentExtra;
+      }
+    }
+  }
+}
+
+
+.dataExplorerErrorConsoleContainer {
+  border-radius: @FabricBoxBorderRadius;
+  box-shadow: @FabricBoxBorderShadow;
+  margin: @FabricBoxMargin;
+  width: auto;
+  align-self: auto;
+}
+
+
+
+.filterbtnstyle {
+  background: #fff;
+  color: #000;
+  border: solid 1px #d1d1d1;
+  border-radius: 4px;
+}
+
+.filterbtnstyle:hover {
+  background: @FabricAccentLight;
+  color: #000;
+  border: solid 1px #d1d1d1;
+}
+
+.filterbtnstyle:active {
+  background: @FabricAccentLight;
+  color: #000;
+  border: solid 1px #d1d1d1;
+}
+
+.filterbtnstyle:focus {
+  background: #fff;
+  color: #000;
+  border: solid 1px #d1d1d1;
+}
+
+
+.gridRowSelected .tabdocumentsGridElement:hover {
+  background-color: @FabricAccentLight !important;
+}