# Architecture
 
This page defines the architectural patterns and layering used in the GregCore Modmanager.

## Current State
- **GregCore Modmanager** is the Avalonia UI-based desktop application.
- It targets **.NET 9** for optimal performance and cross-platform compatibility.

## Layering
The project follows a strict 4-layer separation:
1. **Presentation**: Avalonia UI and ViewModels.
2. **Domain**: Business logic and interfaces.
3. **Infrastructure**: Steam API, Telemetry, and Persistence.
4. **Extensions**: MelonLoader plugins (.NET 6).

## Migration Strategy
1. Keep MAUI app functional while introducing Avalonia in parallel.
2. Move reusable business logic from MAUI-only concerns into shared services.
3. Replace page-by-page UI workflows in Avalonia.
4. Transition packaging and release channels to multi-platform outputs.

## Design Constraints
- Compact information density for usability.
- Keyboard-first interaction patterns.
- Strict Steam publish cooldown enforcement.
- Fully custom window chrome to avoid duplicate title bars.