{
  "content": {
    "categories": {
      "cat":    ["cats",    ["1f431", "1f408"]],
      "dog":    ["dogs",    ["1f436", "1f415"]],
      "fish":   ["fish",    ["1f41f", "1f420"]],
      "bird":   ["birds",   ["1f426", "1f427"]],
      "star":   ["stars",   ["2b50",  "1f31f"]],
      "heart":  ["hearts",  ["2764",  "1f49c"]],
      "tree":   ["trees",   ["1f332", "1f333"]],
      "flower": ["flowers", ["1f338", "1f33b"]]
    },
    "icon_source": "twemoji_cdn",
    "icon_url_template": "https://cdn.jsdelivr.net/gh/twitter/twemoji@latest/assets/72x72/{codepoint}.png",
    "background_source": "local",
    "backgrounds_dir": "backgrounds/train",
    "background_fallback_url": "https://picsum.photos/seed/{seed}/{w}/{h}"
  },
  "render": {
    "canvas_size": [400, 300],
    "icon_size": 50,
    "tolerance_px": 30,
    "grid_cols": 4,
    "grid_rows": 3,
    "margin": 30,
    "icon_count_range": [8, 8],
    "target_count_range": [3, 3],
    "jitter_px": 8
  }
}