Fixed lighting

internal/maps/plains.go

@@ -11,7 +11,19 @@ import (
 func CreatePlains(screenWidth, screenHeight float64) *Map {
 	m := NewMap("plains", 1, "Plains", screenWidth, screenHeight)
 	m.BackgroundColor = color.NRGBA{R: 135, G: 206, B: 235, A: 255}
-	m.TimeOfDay = Daytime
+	m.Lighting = LightConfig{
+		AmbientBrightness: 0.3,
+		Sources: []LightSource{
+			{
+				X:              screenWidth - 80,
+				Y:              80,
+				Radius:         600,
+				Color:          color.RGBA{R: 255, G: 250, B: 220, A: 255},
+				Intensity:      0.7,
+				ShadowDarkness: 0.5,
+			},
+		},
+	}
 
 	// ground surface
 	groundColor := color.NRGBA{R: 34, G: 139, B: 34, A: 255}