Please generate a high-quality, high-definition poster-style storyboard for "{argument name="subject" default="Street Freestyle Football"} · {argument name="action" default="16-Step Action Breakdown"}." The layout should be a square 4x4 grid, with each cell showing a consecutive action step of the same street football performer in the same setting. The entire image should look like a combination of a high-end sports poster and a technical breakdown instructional board, possessing both visual impact and a clear sense of movement explanation.
[Overall Setting]
Theme: Street freestyle football performance (not a match or drill), where one performer completes a continuous set of tricks.
Atmosphere: Street vibe, urban, cinematic, athletic, cool, and rhythmic.
Background: Set in a {argument name="background" default="nighttime urban small street pitch"} or city square football space, with graffiti walls, wire fences, distant building lights, street lamps, and slightly reflective ground. The environment must be consistent and have a trendy street aesthetic.
[Character Requirements]
