Empty background for a 2D survival cartoon: an empty hospital corridor at night, a hospital bed with wheels, a wheelchair, doors with small windows, a flickering ceiling light, an exit sign shape without letters. No people, no blood, no readable text. Composition: the upper third is a calm plain wall, the lower third is clear empty floor. Muted cold green-blue palette, 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.
