Cycling Helmet Engineering Poster with Airflow Visualization

Create a 4:5 vertical professional cycling helmet promotional poster. The core composition is 'Airflow Cross-Section Doors'. A structurally realistic road cycling helmet is suspended in the center of the frame at a side two-thirds angle. The shell is matte ivory white; the internal EPS buffer layer and black straps are naturally visible only at the ventilation holes. Three evenly spaced thin rectangular wind tunnel door frames stand vertically in front of the helmet, and two narrower door frames stand behind, forming a clear foreground-background space. Four semi-transparent cobalt blue airflow bands with real volume enter from the left, passing through the front door frames and helmet ventilation holes. Each airflow band is compressed and split within different channels, then recombines into two smooth wakes at the rear. The airflow bands cannot pass through the solid shell and must not become glowing neon lines. The door frame surfaces use light gray metal, with extremely thin fluorescent orange edges added at the cross-sections to emphasize airflow entry and exit. The title 'AERO' is placed vertically on the far right, maintaining large spacing between letters; two wake streams pass through the negative space between letters without obscuring readability. Only 'VENT 18 / ROAD HELMET' is retained in the bottom left corner. The background is a clean cold-gray studio, with soft shadows on the ground formed jointly by the helmet, door frames, and airflow. Use a combination of high-speed product photography and engineering aesthetics, emphasizing real shell curvature, channel logic, and airflow dynamics. Complete opaque rectangular background, no transparent corners, no alpha masks, no edge feathering. No riders, no bicycles, no exploded views, no HUD parameters, no cyberpunk, no existing brand logos, no watermarks.