edit the existing gym render add a dark false ceiling grid throughout the space suspended below any structural elements with a clean uniform pattern ensure soft shadows and subtle highlights under the grid to enhance depth and realism keep all other elements exactly as they are mezzanine staircase weight lifting and cardio equipment functional area with rubber and fake grass flooring materials lighting perspective and depth unchanged the ceiling should integrate seamlessly with the existing artificial lighting without obscuring any gym equipment no people cinematic architectural visualization
