DELETED:
- All 50+ PHP pages, templates, includes
- app.css and app-v2.css (1782 + 700 lines of accumulated CSS)

CREATED:
- app/core/ — SPA engine (router, state, api, audio, haptics, particles, animate)
- app/screens/ — ES module screens (home, login + placeholders for all routes)
- app/styles/ — Design token system + animations + components
- index.php — now serves SPA shell for all non-API routes

ARCHITECTURE:
- Vanilla JS SPA with ES Modules (no build step, no framework)
- History API router with animated transitions
- Web Audio API synthesizer for game sounds
- Canvas particle system (confetti, coin bursts)
- Web Animations API for juice (number tickers, fly-to, pop, shake)
- Haptic feedback patterns via navigator.vibrate
- Game engines load on-demand as classic scripts (zero modifications)

API endpoints (24) completely unchanged. Game engine JS (25 files) unchanged.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>