update BG, tile

scripts/managers/stop_n_go_manager.gd

@@ -46,6 +46,7 @@ const TILE_START = 3 # Start Line
 const TILE_FINISH = 3 # Finish Line
 const TILE_SAFE = 2 # Green Safe Zone
 const TILE_OBSTACLE = 4 # Wall
+const TILE_LIGHTNING_STONE = 15 # Ancient Rock with Lightning Symbol
 
 var hud_layer: CanvasLayer
 var mission_label: Label
@@ -709,8 +710,8 @@ func _spawn_powerup_tiles():
 	for i in range(PERMANENT_POWERUP_LOCATIONS.size()):
 		var pos = PERMANENT_POWERUP_LOCATIONS[i]
 		
-		# Set Floor 0 beneath power-up to ID 1 (Hover pattern) - Static PADS
-		gridmap.set_cell_item(Vector3i(pos.x, 0, pos.y), 1)
+		# Set Floor 0 beneath power-up to ID 15 (Ancient Lightning Stone)
+		gridmap.set_cell_item(Vector3i(pos.x, 0, pos.y), TILE_LIGHTNING_STONE)
 		
 		# Cycle through the available power-up types
 		var tile_id = POWERUP_TILES[i % POWERUP_TILES.size()]
@@ -720,7 +721,7 @@ func _spawn_powerup_tiles():
 		
 		# Sync both floor and tile to all clients and host
 		if can_rpc():
-			main.rpc("sync_grid_item", pos.x, 0, pos.y, 1) # Sync floor change (Pad on)
+			main.rpc("sync_grid_item", pos.x, 0, pos.y, TILE_LIGHTNING_STONE) # Sync floor change (Stone on)
 			main.rpc("sync_grid_item", pos.x, 1, pos.y, tile_id) # Sync power-up
 	
 	powerups_spawned = true