epic photorealistic cinematic sci-fi scene, imax ultra-wide shot, 8k hyper-detailed, physically based rendering, soft volumetric space haze. a colossal l-shaped partial curved-shell megastructure dominates the frame. the left side is an endlessly towering inward-curved arc hull, formed by massive dark metallic concrete panels with dense vertical structural ribs and deep shadowed gaps between them. the curved hull bends downward and transitions into an infinite stepped terraced platform system, receding layer by layer into the cosmic distance. each tier is separated by wide dark void gaps, creating extreme infinite depth, powerful spatial hierarchy and overwhelming scale. the megastructure surface is covered with countless tiny scattered city lights, some areas appear as dark abandoned industrial cavities, while other sections glow with faint warm illumination. a large pale celestial moon or half-finished artificial planet hangs in the dark starry sky at the upper right, with a thin glowing rim light tracing its curved edge. below the megastructure, a misty planetary cloud sea and distant low-altitude city lights stretch across the horizon. cool muted teal-blue color palette, low-key dramatic lighting, solemn desolate sublime atmosphere, deep depth of field, sharp textures, heavy weathering, scratches, erosion, industrial decay and immense cosmic awe. remove all foreground cliff platforms, mechanical ledges, human figures, silhouettes and small foreground objects. no monolith pillar, no solid straight wall, no complete ring-world, no cartoon, no anime, no illustration, no painting, no deformed architecture, no text, no watermark, no ui elements, no bright oversaturated colors, no grain noise artifacts, no extra debris clutter.