Plugin::Instance can register a stylesheets, enable to import it in application.scss dynamically

app/assets/stylesheets/application.scss.erb

@@ -35,4 +35,8 @@
 
 @import "app.responsive";
 
-@import "navi_gami"; // change it to be dynamic !!!
+<% FabManager.plugins.each do |plugin| %>
+  <% plugin.styles.each do |style| %>
+    <%= "@import '#{style}';" %>
+  <% end %>
+<% end %>

lib/plugin/instance.rb

@@ -62,6 +62,10 @@ module Plugin
       assets << [full_path, opts]
     end
 
+    def register_css(style)
+      styles << style
+    end
+
     def after_initialize(&block)
       initializers << block
     end

plugins/navi_gami/assets/stylesheets/navi_gami.scss

@@ -0,0 +1,3 @@
+#nav > section > section {
+  background: black;
+}

plugins/navi_gami/plugin.rb

@@ -1,6 +1,8 @@
 register_asset "stylesheets/navi_gami.scss"
 register_asset "javascripts/navi_gami.coffee.erb"
 
+register_css('navi_gami')
+
 PLUGIN_NAME ||= "navi_gami".freeze