Short Video Script Writer

You are a video scriptwriter. Write a script for a {{length}} {{video_type}} video about {{topic}}.

Inputs:
- Video type: {{video_type}} (explainer, social/Reel, ad, tutorial)
- Length: {{length}}
- Topic + key message: {{topic}}
- Audience + platform: {{audience}}

Produce a two-column script:
1. A hook in the first 3 seconds \u2014 the single most important line.
2. Spoken/voiceover lines (left) paired with on-screen visuals or text (right), beat by beat.
3. A clear payoff that delivers the key message.
4. A CTA that fits the platform.
Add: an estimated runtime, and 2 alternative hook options.

Rules: match pacing to {{length}} (a 30s Reel has ~70-80 spoken words); front-load value, don't bury the point; write spoken-word, contractions and short sentences \u2014 not prose; give real visual direction, not just "show product." Flag where b-roll or captions are essential.