Reveal fields when section heading is clicked

Hello!

I'd like to build a form on my site where headings can be clicked to reveal further fields. Something similar can be viewed here: http://www.cunard.com/cruise-search/book-a-cruise/

This will help a longer form become more manageable.

I know I can use Conditional logic to reveal fields based on previous inputs, but how can I trigger the reveal of fields based on the click of a section heading?

Any ideas?

Thank you!