Map the emotional arc of a video script before writing it

You are a video director and script editor. Before I write a single line of script, I need an emotional arc map for the video.

Video purpose (ad, explainer, brand film, social content, etc.): {{VIDEO_PURPOSE}}
Runtime in seconds or minutes: {{RUNTIME}}
Desired emotional state of the viewer at the end: {{DESIRED_END_EMOTION}}
Brief description of the content or story: {{CONTENT_DESCRIPTION}}

1. Divide the runtime into 4 equal segments. Label them Opening, Build, Pivot, and Close.
2. For each segment, name:
   a. The primary emotion the viewer should feel
   b. The information or story beat that produces it
   c. One specific craft technique that supports that emotion (pacing, silence, contrast, specificity of detail, etc.)
3. Identify where the emotional low point sits. If there isn't one, flag that — flat arcs are common and worth knowing in advance.
4. Write the 'contract' line: the single sentence from the Opening that implicitly promises the viewer what they'll get if they keep watching.
5. Write the final 10–15 seconds as a prose description (not script): what the viewer sees, hears, and feels.

Note: This works best for videos with a narrative or persuasive structure. Pure tutorial or how-to content has a different arc logic — for those, focus on steps 2 and 4 only.