/*
============================================================
MVP Algebra 1 — Theme Engine styles (shared)
© 2026 Alondra Delgado. All rights reserved.
Part of the MVP Algebra 1 platform.
Phase 2 — Pass A / Batch A.4 (critical-path CSS split).
Extracted VERBATIM from drill.html (theme variables L37–105 +
rich animated backgrounds L117–457). "Refactoring is a MOVE, not a
REDESIGN" (CLAUDE.md §12.2): no theme value (color, font, gradient,
animation timing, decoration parameter) is changed here.
This file is the theme system's CSS half. It is loaded via a
render-blocking in each consuming page's (BEFORE the
page's inline