studio - revises button styling/states for primary nav

common/static/sass/_mixins.scss

@@ -190,6 +190,27 @@
   }
 }
 
+// simple nav button styling - should we move this elsewhere?
+.btn-nav-simple {
+  @extend .btn;
+  @extend .btn-pill;
+  padding:($baseline/4) ($baseline/2);
+  border-width: 1px;
+  border-style: solid;
+  border-color: transparent;
+  text-align: center;
+
+  &:hover, &:active {
+    @extend .fake-link;
+    border-color: $gray-l3;
+  }
+
+  &.current, &.active {
+    @include box-shadow(inset 0 1px 2px 1px $shadow);
+    border-color: $gray-l2;
+  }
+}
+
 // UI archetypes - well
 .ui-well {
   @include box-shadow(inset 0 1px 2px 1px $shadow);