Children’s Storybook

Create a structured Children’s Storybook document.
Primary brief:
{{brief}}

Reference directions: "Little lion learns courage" and "Cloud who wanted to sing".
Audience: {{audience}}
Tone: {{tone}}
Detail level: {{detail_level}}
Output mode: {{output_mode}}
Image density: {{image_density}}

Return strict JSON only with this shape:
{
  "title": "...",
  "sections": [
    { "heading": "...", "body": "...", "bullets": ["...", "..."], "image_prompt": "...", "image_url": "..." }
  ]
}
If output_mode is text-only, omit image_prompt and image_url from each section.
If output_mode is text-and-images, add image_prompt fields for the strongest scenes or pages.
If output_mode is images-only, keep copy minimal and let image_prompt lead each section.
Make the document clear, polished, and mobile-readable. Do not wrap the JSON in markdown fences.