Instructions:
1. Select a trail from the dropdown — its track appears on the map as an orange dashed line
2. Optionally expand Corridor Width to change the search radius (default: 5 km)
3. Click on the map to set the Start point
4. Click again to set the End point — the first leg of your route is calculated automatically
5. Keep clicking to extend the route leg by leg; use Undo Last Pin to remove your last click, or Clear Route to start over
6. Click Download GPX to save the route for Strava, Komoot, Suunto, Garmin, or similar