Empty background for a 2D survival cartoon: a looted supermarket aisle, half-empty shelves, a few boxes and cans on the floor, a fallen price stand, flickering fluorescent lights. No people, no readable text or brands. Composition: the upper third is plain ceiling with lights, the lower third is clear empty floor. Muted cold palette with a sickly green light, soft vignette. Same drawing style as the attached reference: 2D cartoon, hand-drawn look, thick black outlines, flat colors with simple soft shading, no texture. Vertical 9:16 (1080x1920). Keep all important objects inside the central 80% of the width.
