• Free canvas for transitions between scenes (page turn, wipe, reveal, dissolve, iris).
• Basic timing: duration, easing, direction, optional hold.
• Optional from/to stills or solid plates for preview.
• SFX hooks (whoosh, click) aligned with the presentation sound map.

Renderer endpoint for this kind is not live yet — the document shape below is the contract we will implement on Modal (same Worker proxy pattern as presentations).

{
  "version": 1,
  "kind": "motion",
  "canvas": {
    "aspect": "16:9",
    "quality": "m"
  },
  "background": {
    "style": "solid",
    "color": "#000000"
  },
  "timing": {
    "total_duration_sec": 1.6
  },
  "sounds": {
    "enabled": true,
    "whoosh": "whoosh"
  },
  "motion": {
    "effect": "page_turn",
    "duration_sec": 1.2,
    "easing": "smooth",
    "direction": "left",
    "hold_sec": 0.2,
    "from": {
      "color": "#071221"
    },
    "to": {
      "color": "#0B1F17"
    }
  }
}