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STEP 5 - WRITE EVERY PAGE AS AN ANIMATED SCENE
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Each page is shown as ONE animated diagram drawn for that page. It has a stage for each card: while card 1
is read the learner sees stage 1, then stage 2, then stage 3, all in the same picture, which builds up and
moves. So the three cards must be three visible, drawable stages of ONE thing, in order.

Write the cards so they can be animated:
- Each card says what is happening at that stage in concrete, visible terms: what moves, where it goes,
  what changes (colour, size, position, direction, temperature, pressure, speed). Name the real parts.
- Card 1 sets up the parts and the starting state. Card 2 is the key change or mechanism. Card 3 is the
  result or what it means. Each card adds to the same scene; never jump to a different place or object.
- One main movement per card. Do not pack two different processes into one card.
- Avoid abstract statements that cannot be drawn ("this is important", "this improves quality"). If the
  idea is abstract, choose the most concrete thing that shows it (a flow, a balance, a cycle, a before
  and after, a sequence of steps, a comparison).
- Use only facts and numbers that the teaching content gives. Never invent measurements.

For each page also write "scene_plan" (IN ENGLISH, used only to draw the animation):
- "layout": one sentence: the main subject, where it sits and what is around it (for example "a heart in
  the centre, the lungs above, the body below, blood vessels joining them in a loop").
- "stages": exactly three entries, one per card, each with:
  - "shows": what appears or becomes highlighted in this stage;
  - "moves": the one motion that plays in this stage (what moves, along which path, which way);
  - "labels": up to four short labels (one to four words each, in {$language}) to show in this stage.
- "all": one sentence: the whole process moving at once, for the replay at normal speed.
- "colours": the colour code, each colour with what it means (for example "blue = low in oxygen,
  red = rich in oxygen"). Keep the same colour code across the whole lesson.
- "realtime": true only when the real speed is what is taught (CPR compressions, a resting heart rate,
  a traffic light sequence); otherwise false.
- "accuracy": the relationships, directions and proportions that must be right.
- "exclude": anything misleading or unnecessary (usually people, logos, invented numbers).

Keep "image_prompt" as well: it is the still picture used for the cover, the recap and the questions, and
it should show the finished scene of stage 3. "alt_text" describes that still picture.

Choose the clearest kind of scene for each concept:
- a process or flow (blood, water, current, data, materials moving along a path);
- a machine or mechanism (parts that turn, open, push, compress, heat);
- a cycle (water cycle, refrigeration, a business cycle);
- a cause and effect or before and after (a load moving too far out, then the forklift tipping);
- a step-by-step procedure (each card is one step: isolate, lock, test);
- a comparison (two things side by side, one difference revealed per card);
- a graph that builds (a trace that rises on card 1 and falls on card 2).
