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+# Configuration Guide
+
+This guide covers the configuration options for ACC Server Manager.
+
+## Environment Variables
+
+### Required Variables (Auto-generated)
+
+These are automatically created by the setup script:
+
+- `JWT_SECRET` - Authentication token secret
+- `APP_SECRET` - Application encryption key
+- `ENCRYPTION_KEY` - Database encryption key
+
+### Optional Variables
+
+| Variable | Description | Default |
+|----------|-------------|---------|
+| `PORT` | Web server port | `3000` |
+| `DB_NAME` | Database filename | `acc.db` |
+| `STEAMCMD_PATH` | Path to SteamCMD | `c:\steamcmd\steamcmd.exe` |
+| `NSSM_PATH` | Path to NSSM | `.\nssm.exe` |
+| `CORS_ALLOWED_ORIGIN` | Allowed CORS origins | `http://localhost:5173` |
+
+## Setting Environment Variables
+
+### Temporary (Current Session)
+
+```powershell
+# PowerShell
+$env:PORT = "8080"
+$env:STEAMCMD_PATH = "D:\tools\steamcmd\steamcmd.exe"
+```
+
+### Permanent (System-wide)
+
+1. Open System Properties → Advanced → Environment Variables
+2. Add new system variables with desired values
+3. Restart the application
+
+## Server Configuration
+
+### ACC Server Settings
+
+Each ACC server instance has its own configuration managed through the web interface:
+
+- **Server Name** - Display name in the manager
+- **Port Settings** - TCP/UDP ports (auto-assigned or manual)
+- **Configuration Files** - Edit `configuration.json`, `settings.json`, etc.
+
+### Firewall Rules
+
+The application automatically manages Windows Firewall rules for ACC servers:
+
+- Creates inbound rules for TCP and UDP ports
+- Names rules as "ACC Server - [ServerName]"
+- Removes rules when server is deleted
+
+## Security Configuration
+
+### Password Requirements
+
+- Minimum 8 characters
+- Mix of uppercase, lowercase, numbers
+- Special characters recommended
+
+### Session Management
+
+- JWT tokens expire after 24 hours
+- Refresh tokens available for extended sessions
+- Configurable timeout in future releases
+
+## Database
+
+### SQLite Configuration
+
+- Database file: `acc.db` (configurable via `DB_NAME`)
+- Automatic backups: Not yet implemented
+- Location: Application root directory
+
+### Data Encryption
+
+Sensitive data is encrypted using AES-256:
+
+- Steam credentials
+- User passwords (bcrypt)
+- API keys
+
+## Logging
+
+### Log Files
+
+Located in `logs/` directory:
+
+- `app.log` - General application logs
+- `error.log` - Error messages
+- `access.log` - HTTP access logs
+
+### Log Rotation
+
+Currently manual - delete old logs periodically.
+
+## Performance Tuning
+
+### Database Optimization
+
+- Use SSD for database location
+- Regular VACUUM operations recommended
+- Keep database size under 1GB
+
+### Memory Usage
+
+- Base usage: ~50MB
+- Per server instance: ~10MB
+- Caching: ~100MB
+
+## Advanced Configuration
+
+### Custom Ports
+
+To use custom port ranges for ACC servers:
+
+1. Log into web interface
+2. Go to Settings → Server Defaults
+3. Set port range (e.g., 9600-9700)
+
+### Multiple IPs
+
+If your server has multiple network interfaces:
+
+1. ACC servers will bind to all interfaces by default
+2. Configure specific IPs in ACC server settings files
+
+## Configuration Best Practices
+
+1. **Backup your `.env` file** - Contains encryption keys
+2. **Use strong passwords** - Especially for admin account
+3. **Regular updates** - Keep ACC Server Manager updated
+4. **Monitor logs** - Check for errors or warnings
+5. **Test changes** - Verify configuration changes work as expected