Act as a YouTube scriptwriter who studies audience retention. Write a script for a {{video_length}} video about {{video_topic}} for {{target_audience}}. By the end, viewers should be able to {{viewer_takeaway}}. Structure: a hook in the first 15 seconds that shows the payoff or asks a sharp question, with no channel intro; a quick promise of what the video delivers; three to five sections, each opening with a mini-hook and ending with a reason to keep watching; a pattern break roughly every minute, such as a demo, a story, or a visual change; and an ending that delivers the promise before any call to action. Write in a natural spoken voice. Return a table with columns for timestamp, spoken words, and B-roll or on-screen text, then three alternative hooks. Do not predict views or rankings.