WD4A, CSS & Co. - What is possible with WD4A concerning CSS and jQuery

Hello,

I would like to develop a program that is doing the modern web things like looking cool (with CSS) and Drag & Drop (jQuery UI) but I am not getting the point if this really works well enough with WD4A. I found several hints that I can use themes without the need to use the portal. For Drag & Drop there are also hints like Drag and Drop with Calendar functionality in BSP/WebDynpro The point is that I don't know if this is working good enough..

Could some of you that have been already with this kind of stuff some hints if it is working good and stable? How is it possible to integrate jQuery in a WD4A application?

The other idea is to use BSPs/htmlb to integrate jQuery because this looks easier than working with WD4A.

What do you think about it? Could you give some advice on how to use CSS and jQuery?

Thanks a lot and have a nice weekend,

Vanessa