inner and outer page margins in portrait and landscape orientation

Hello AsciiDoctors,
I'm using
:doctype: book
:media: prepress

The page margins for the left and right pages are defined like this.
page_margin_inner: 0.90in
page_margin_outer: 0.59in

All is working as expected when I create a pdf, the margins are switching between inner and outer for left and right pages. But it's not working for me anymore, when I change the page orientation to landscape.
In landscape orientation the inner and outer margin are still used for the left and right page margin. But the binding margin must be at the top or buttom side now.

Is there any possibility to use different themes for portrait and landscape or any other possibility to rectify this issue?

Heiko