stylized sci-fi map 3d model

Create a single isolated game environment shell for a stylized sci-fi map. A large square floor platform with clean, solid geometry and raised perimeter walls around the outer edges. The floor should be wide and mostly flat, suitable as the base for a first-person shooter map. The perimeter walls should be tall enough that a player cannot jump over them, approximately 2.5 to 3 meters high. Add slight height variation to some wall sections to make the shape visually interesting, but keep the playable floor completely open. Style: stylized semi-realistic sci-fi, clean futuristic architecture, subtle panel details, dark blue-grey metal and concrete materials, slightly worn but not damaged, high-quality game environment appearance. IMPORTANT: Only create the floor platform and outer walls. No buildings. No trees. No vegetation. No furniture. No props. No characters. No vehicles. No stairs. No doors. No roof. No decorations in the center. No surrounding environment. No floating objects.