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Phase 1 of the "fully MUI" CSS cleanup. - base.css 429->317: drop dead .admin-sidebar/header/card/modal, .admin-drag-handle/-kbd/-mono/-error-stack/-loading and the unused float/pulse keyframes. Keep reset, typography, scrollbar, ::view-transition cross-fade, the live .admin-spinner (App.tsx pre-React loader) and all utility classes. - attendance.css 456->24: keep only the Leaflet .attendance-location-map rules; the old hand-rolled Attendance page is MUI now. - offers.css 642->417: keep only the Quill (.admin-rich-editor/.ql-*) and .admin-rich-text-view rules; drop the dead offers table / filter / lang-badge / row-state rules. - plan.css deleted: the grid already lives in PlanGrid's styled() wrapper; the last consumer (.plan-cat-color) is now an sx-styled Box input in PlanCategoriesModal. tsc -b --noEmit and npm run build both clean. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>