Write a complete YouTube video script in a {{tone}} tone for {{target_audience}} about {{topic}} to sell {{product}}. The script should run 12–15 minutes. Include: a hook, introduction, 4–6 main content segments with B-roll notes and engagement cues, a climax with a key insight, a conclusion with CTA, and YouTube optimization (5 title options, description template, 15 tags, thumbnail concept, card timestamps). Keep under 1800 words. Paste any relevant background information after these instructions before running.