Note that you don't need any @ sigil inside this @case because it contains condition { CSS } pairs; where something like "default" or "otherwise" can be recognized as a special condition word without a sigil. Selectors do not appear there; "otherwise" isn't syntactically a selector for some <otherwise> tag.
I got it down to one @ sygil to write a long conditional ladder with any number of conditions and a default.
It could be called @cond, in the Lisp style; not a lot of people know that though.
The first condition that is true fires; the rest are then ignored, so the order of the cases matters. Many languages call that sort of thing using "case" terminology.
Probably a diagnostic in the browser console is worthwhile if the always true "otherwise" condition is followed by anything.
