Use the uploaded padded benthic crab as the exact locked identity, shell shape, mottled blue-bronze pattern, two eye stalks, two claws, eight walking legs, joints, proportions and premium painted 2.5D material reference. On the existing mathematically pure black #000000 matte with a completely fixed camera, create one uninterrupted five-second reversible localized walking half-cycle. Keep the complete crab centered inside the central 70 percent with no frame travel and no generated floor. The body makes one small lateral weight transfer while the eight legs articulate in coherent alternating phases; both claws stay heavy and controlled, and the eye stalks make tiny independent corrections. Preserve a stable readable three-quarter frontal silhouette. The movement must remain believable when played backward; runtime owns the lower-corridor route. NEGATIVE PROMPT: No background, seabed, sand, rock, shadow plate, water, particles, camera movement, zoom, cut, traversal, approach to camera, turn away, full rotation, jump, burrow, attack, claw snap, extra or missing legs, fused legs, broken joints, extra claws, missing eye stalk, changed shell, rubber body, frame-edge contact, cropping, rigid card slide, fade, ghost, crossfade, duplicate, morphing, blur, freeze, text, logo, UI or reels.
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