Same Theme on External Pages

Hi Can anybody help?

I wish to create some external pages outside of WordPress that look the same as the Graphene theme in order to use some PHP scripts not available within WordPress.

I am usnig the standard black theme color.

I wish the user experience to be seamless and using the same menu buttons and colors outside of WordPress would help.

Do I need some graphics or is the menu bar entirely CSS?

Is there a way on making these external pages behave like Graphene on a mobile?Ipad compatibility side? I.e. the resizing and usability side?

Any help would be much appreciated.