Fixed mode card arrangement

[fxedel]

The problem with :nth-of-type is, that it only works with tags, not classes. See mdn docs:

The :nth-of-type(an+b) CSS pseudo-class matches an element that has an+b-1 siblings with the same element name before it in the document tree

If a tag is matched by :nth-of-type, it only later checks if it also matches the selector before, e.g. .card.fixture-mode in .card.fixture-mode:nth-of-type. So it's not possible to match every second .card, but only every second section. See this live fiddle showing this problematic.

We could either keep it like this and toggle between even and odd every time sections are added/removed before the modes or we introduce another container around the modes.