Page Manager URL arguments This seems like it should be simple, but I can't figure out how to get Page Manager and Pathauto to play nice together.

I'm trying to use Page Manager/Panels for a set of pages of a specific node type.  If I use the built-in (System) "node-view" page, the URLs work fine...

/content/nice-clean-node-title

But if I try to create my own Pages, I'm forced to use the node id as an argument?

/content/1

When you get to the arguments for a URL, there is no option to use node title.

My question is... how do I create variants within Page Manager that deliver node content in different ways based on a (clean) URL...

/content/some-node-title/overview

/content/some-node-title/detail

/content/some-node-title/specs

etc.

Am I missing something?  Or is this really difficult to achieve with Drupal?
Node titles are not unique, so they cannot be used directly. You need to create page with nice, machine-readable, numerical ID, and then assign it it's own URL Alias. Works similar in Drupal from 5 to 8 as far as I know, menu names might be a bit different, that's all.

Pathauto is nice automation for aliases, but only on nodes. There was already similar, but not identical question with some answers.