wicked_pdf ignoring styles, print media type

# Rails 3.2.9, Ruby 1.9.3
# wicked_pdf (0.9.2)
# wkhtmltopdf (0.1.2)
# wkhtmltopdf-binary (0.9.9.1)

# Gemfile
gem 'wicked_pdf'
gem "wkhtmltopdf-binary", "~> 0.9.9.1"

# config/application.rb
require 'wicked_pdf'
config.middleware.use "WickedPdf::Middleware", :print_media_type => true

# views/shared/_header.html.erb
<%= stylesheet_link_tag "application", :media => "all" %>

# assets/stylesheets/application.css
@media print {
    .navbar {display: none;}
}

# controllers/statements_controller.rb
# doesn't seem to be picking up any of the rendering options
  def show
    @statements = Statements.find_by_id(params[:id])
    respond_to do |format|
      format.html
      format.pdf do
        render :pdf => 'file_name',
          :template => 'statements/show',
          :handlers => [:erb],
          :formats => [:pdf],
          :print_media_type => true,
          :disable_links => true,
          :disable_internal_links => true,
          :margin => {:top => 300}
      end
    end
  end

# views/statements/show.html.erb
<p><%= link_to 'Create PDF document', statement_path(@statement, :format => :pdf) %></p>
<%= render :partial => 'show' %>

# views/statements/_show.html.erb
# irrelevant - working just fine

# views/statements/show.pdf.erb
# Also tried renaming to show.pdf.html.erb, then specifying in
# controllers/statements_controller.rb under :template - no change.
# Attempting separate template only because it's not picking up
# print media type (to be able to style with @media)
<h1>TEST PDF</h1>