{
  "$schema": "https://hyperframes.heygen.com/schema/registry-item.json",
  "name": "echo-trail",
  "type": "hyperframes:component",
  "title": "Echo Trail",
  "description": "A moving element renders with N ghosted copies of itself at t minus i times delta, opacity stepped down per ghost; one traversal, echoes collapsing into the settled element at rest.",
  "tags": ["motion-primitive", "demonstrate", "trail", "onion-skin", "ghosts", "deterministic"],
  "jobs": ["demonstrate"],
  "family": "demonstrate",
  "profile": "onion-skin",
  "evidence": "Wave L5 frame study: generalized onion skin from the trails contact sheets",
  "syncPoints": [{ "id": "travel-complete", "phase": "in", "offset": 2.1 }],
  "files": [
    {
      "path": "echo-trail.html",
      "target": "compositions/components/echo-trail.html",
      "type": "hyperframes:snippet"
    }
  ],
  "variables": [
    {
      "id": "echoes",
      "type": "number",
      "role": "style",
      "label": "Echoes",
      "description": "Ghost copy count, clamped 2 to 6.",
      "default": 4
    },
    {
      "id": "delta",
      "type": "number",
      "role": "timing",
      "label": "Delta",
      "description": "Lag between successive ghosts in seconds, clamped 0.03 to 0.3.",
      "default": 0.09
    },
    {
      "id": "path",
      "type": "enum",
      "role": "timing",
      "label": "Path",
      "description": "Authored traversal preset.",
      "default": "sweep",
      "options": [
        { "value": "sweep", "label": "Sweep" },
        { "value": "rise", "label": "Rise" },
        { "value": "arc", "label": "Arc" }
      ]
    },
    {
      "id": "accent",
      "type": "enum",
      "role": "style",
      "label": "Accent",
      "description": "Subject accent color: green rides --brand, blue rides --accent, violet rides --accent-2.",
      "default": "green",
      "options": [
        { "value": "green", "label": "Green" },
        { "value": "blue", "label": "Blue" },
        { "value": "violet", "label": "Violet" }
      ]
    },
    {
      "id": "exit",
      "type": "enum",
      "role": "timing",
      "label": "Exit",
      "description": "Optional departure. Default none: the settled element holds until the frame cuts.",
      "default": "none",
      "options": [
        { "value": "none", "label": "None" },
        { "value": "fade", "label": "Fade" },
        { "value": "up", "label": "Up" }
      ]
    }
  ]
}