# Systems Index

> **Last Updated**: 2026-04-30

## Index

| Priority | System | Layer | Category | Status | Design Doc |
|---------|--------|-------|----------|--------|------------|
| 1 | Node System (节点系统) | Game Flow | Level/World | Approved | `design/gdd/node-system.md` |
| 2 | Combat System (战斗系统) | Gameplay | Combat | Approved | `docs/CombatNodeArchitecture.md` |
| 3 | Tower Assembly (塔组装系统) | Gameplay | Economy | Approved | `design/gdd/tower-assembly.md` |
| 4 | Shop System (商店系统) | Gameplay | Economy | Approved | `design/gdd/shop.md` |
| 5 | Event System (事件系统) | Gameplay | Narrative | Approved | `design/gdd/event-system.md` |
| 6 | Progression (成长系统) | Meta | Progression | Approved | `design/gdd/progression.md` |
| 7 | Tag System (标签系统) | Gameplay | Combat | Approved | `design/gdd/tag-system.md` |

## Progress Tracker

- **Total Systems**: 7
- **Designed**: 0
- **Approved**: 7 (Combat, Tower Assembly, Node System, Progression, Shop, Event, Tag)

## Layer Definitions

| Layer | Description |
|-------|-------------|
| Meta | Outer loop (progression, unlocks) |
| Game Flow | Navigation, state machine, save/load |
| Gameplay | Core game mechanics |
| Foundation | Engine integration, services |

## Category Definitions

- **Combat**: Damage, health, enemy AI, tower behavior
- **Economy**: Currency, shop, crafting, loot
- **Level/World**: Maps, nodes, terrain, world state
- **Progression**: XP, levels, unlocks, meta progression
- **Narrative**: Events, dialogue, story beats