Dark-UCM troch car-dochao

CSS extension that applies a modern dark reskin to the UCM Virtual Campus (Moodle) https://cvdof.ucm.es/moodle/

It improves contrast, readability, and overall visual consistency without changing core functionality. Designed to reduce eye strain during long study sessions, especially at night, it refines colors, spacing, and typography while staying aligned with the original layout. (Functionality or readability may be affected)