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+# Environment Variable Implementation Summary
+
+This document summarizes the implementation of environment variable support for UnitForge, making the application configurable without code changes.
+
+## Overview
+
+The implementation adds comprehensive environment variable support to UnitForge, allowing configuration of:
+- Application metadata (name, version, description)
+- External links (GitHub, documentation, bug reports)
+- Server settings (host, port, debug mode)
+- CORS configuration
+- Contact information
+
+## Files Modified
+
+### Core Configuration
+- **`backend/app/core/config.py`** - New configuration module with Settings class
+- **`.env.example`** - Template for environment variables
+- **`docs/ENVIRONMENT.md`** - Comprehensive documentation
+
+### Application Integration
+- **`backend/app/main.py`** - Updated to use settings and inject template context
+- **`backend/cli/__init__.py`** - Updated to use configurable app name and version
+- **`backend/__init__.py`** - Updated to use environment variables for metadata
+
+### Templates
+- **`frontend/templates/index.html`** - Updated to use template variables
+- **`frontend/templates/templates.html`** - Updated to use template variables  
+- **`frontend/templates/editor.html`** - Updated to use template variables
+
+### Build and Development
+- **`pyproject.toml`** - Added python-dotenv dependency
+- **`docker-compose.yml`** - Added env_file support to all services
+- **`Makefile`** - Added .env file creation during setup
+- **`check-uv.sh`** - Updated to use environment variable for GitHub URL
+
+## Key Features
+
+### 1. Configuration Management
+```python
+from app.core.config import settings
+
+# Access configuration
+print(settings.app_name)
+print(settings.github_url)
+```
+
+### 2. Template Integration
+HTML templates automatically receive configuration variables:
+```html
+<title>{{ app_name }} - Page Title</title>
+<a href="{{ github_url }}">GitHub</a>
+```
+
+### 3. Environment File Support
+- Automatic loading of `.env` files using python-dotenv
+- Fallback to default values when variables are not set
+- Docker Compose integration
+
+### 4. Development Workflow
+- `make setup-dev` automatically creates `.env` from template
+- Environment variables override defaults
+- No code changes needed for different deployments
+
+## Configuration Variables
+
+### Application Settings
+```bash
+APP_NAME=UnitForge
+APP_VERSION=1.0.0
+APP_DESCRIPTION=Create, validate, and manage systemd unit files
+```
+
+### External Links
+```bash
+GITHUB_URL=https://github.com/will666/unitforge
+DOCUMENTATION_URL=https://unitforge.readthedocs.io/
+BUG_REPORTS_URL=https://github.com/will666/unitforge/issues
+```
+
+### Server Configuration
+```bash
+HOST=0.0.0.0
+PORT=8000
+DEBUG=false
+CORS_ORIGINS=*
+```
+
+### Contact Information
+```bash
+CONTACT_EMAIL=contact@unitforge.dev
+```
+
+## Benefits
+
+1. **Deployment Flexibility** - Same codebase works across environments
+2. **Customization** - Easy branding and configuration changes
+3. **Security** - Sensitive values can be set via environment
+4. **Container Ready** - Full Docker and Kubernetes support
+5. **Developer Friendly** - Automatic setup and clear documentation
+
+## Usage Examples
+
+### Development Override
+```bash
+# Temporary override for testing
+GITHUB_URL="https://github.com/myorg/fork" python -m uvicorn backend.app.main:app
+```
+
+### Production Deployment
+```bash
+# Production .env file
+APP_NAME=UnitForge Production
+DEBUG=false
+HOST=0.0.0.0
+PORT=80
+GITHUB_URL=https://github.com/mycompany/unitforge
+SECRET_KEY=production-secret-key
+```
+
+### Docker Deployment
+```yaml
+# docker-compose.yml automatically loads .env
+services:
+  unitforge:
+    env_file: .env
+    environment:
+      - DEBUG=false  # Override specific values
+```
+
+## Testing
+
+All changes have been validated:
+- ✅ Configuration loads correctly with defaults
+- ✅ Environment variables override defaults
+- ✅ Templates render with injected variables
+- ✅ CLI shows configured app name and version
+- ✅ Docker Compose loads environment files
+- ✅ No linting errors or diagnostics issues
+
+## Migration Path
+
+For existing deployments:
+1. Copy `.env.example` to `.env`
+2. Customize values as needed
+3. No code changes required
+4. Templates automatically use new variables
+
+## Future Enhancements
+
+Potential additions:
+- Database configuration via environment
+- Email service configuration
+- Logging configuration
+- Feature flags
+- API rate limiting settings
+- Theme customization variables
+
+## Conclusion
+
+This implementation provides a robust, flexible configuration system that follows modern application development best practices while maintaining backward compatibility and ease of use.
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