How to organize a lot of related blocks for facet search programatically?

Question

I am experimenting with Solr search and the Facet API, and I've created a search page that now has about a dozen facet blocks on it.

Right now it just looks like Block 1, Block 2, Block 3, Block 4, etc.

I would like to group these into categories, such as Category A (Blocks 1-3), Category B (Blocks 4-9), and Category C (Blocks 10-12). Ideally these categories would be collapsible.

I already have way too many modules on my site so I want to avoid adding a new module (such as Block Group) to do this.

In this case, is CSS the way to go, or is there some aspect of Drupal that can help with this?

Answer 1

I ended up doing this with Panels. I took the facet blocks and grouped them using mini panels, and then I used Panels Style Collapsible to allow them to be expanded or contracted as necessary.