/* * Campaign template-builder — syntax-highlighting code editor, insert toolbar, guidance callout, * and split live preview (009 / FR-005/006 / US3). * * Registered as a static Filament CSS asset (see AdminPanelProvider::boot) and published verbatim * by `php artisan filament:assets` — NO build step. Filament v5 ships only its own `fi-*` classes * (no raw Tailwind utilities, and it does not scan these Blade views), so EVERYTHING the builder * renders is styled here with dedicated classes. Colours reuse Filament's theme CSS variables * (`--primary-*`, `--gray-*`, resolved per-panel at runtime) with hard fallbacks, and dark mode * hangs off Filament's `.dark` class on . */ /* ======================================================================================= * 1. Code editor — "highlight-over-textarea": a colourised 
 sits exactly behind a
 *    transparent