# Proposal

## Why

The current default arena is 400×400 logical pixels (50×50 cells), too small for comfortable exploration. The arena should occupy about 80% of a FullHD screen, adapting to the actual output size and scale.

## What Changes

- Use `wl_output` mode dimensions to compute a default logical window size equal to 80% of the output, divided by the active scale.
- Keep the 8 px logical cell size; grid dimensions derive from the logical window size.
- Preserve resizable behavior and grid recalculation on resize.
- Provide a sensible fallback when output info is unavailable.

## Capabilities

### New Capabilities

- `arena-sizing`: output-aware default arena size (~80% of screen) with fallback and resize handling.

### Modified Capabilities

None.

## Impact

- Affected code: `wlgol.c` (output mode handling, default size calculation, canvas/grid resize).
- No new dependencies.