# PRD: Card Evolution System

**This document has been refactored into chapters. See [prd-evolution/README.md](prd-evolution/README.md).**

The monolithic PRD was split into 14 chapter files at v4.0 for maintainability.
All content is preserved — nothing was removed, only reorganized.

## Quick Links

| Chapter | File |
|---------|------|
| Index + Executive Summary | [README.md](prd-evolution/README.md) |
| Business Objectives | [01-objectives.md](prd-evolution/01-objectives.md) |
| Architecture | [02-architecture.md](prd-evolution/02-architecture.md) |
| Evolution Tracks | [03-tracks.md](prd-evolution/03-tracks.md) |
| Milestones | [04-milestones.md](prd-evolution/04-milestones.md) |
| Rating Boosts | [05-rating-boosts.md](prd-evolution/05-rating-boosts.md) |
| Database Schema | [06-database.md](prd-evolution/06-database.md) |
| Variant System | [07-variant-system.md](prd-evolution/07-variant-system.md) |
| Display, Visuals, Animated Cards | [08-display.md](prd-evolution/08-display.md) |
| Integrations | [09-integrations.md](prd-evolution/09-integrations.md) |
| Economy | [10-economy.md](prd-evolution/10-economy.md) |
| Safeguards | [11-safeguards.md](prd-evolution/11-safeguards.md) |
| API Endpoints | [12-api.md](prd-evolution/12-api.md) |
| Implementation + Checklists | [13-implementation.md](prd-evolution/13-implementation.md) |
| Risks + Open Questions | [14-risks.md](prd-evolution/14-risks.md) |