Pick a real brand. Write a creative brief with all 8 fields. Produce a 30-second spec spot in AI-first workflow, delivered in 16:9, 9:16, and 1:1. Ship it with 3 different hook variants, each as its own :06 bumper. Document the brief, shot list with retries, and a 200-word rationale on which hook you'd put media weight behind and why. Deliverables: all four MP4s (hero + 3 bumpers), brief doc, shot list, rationale.