{
  "type": "object",
  "properties": {
    "group_id": {"type": "string", "pattern": "^[a-z0-9][a-z0-9_]*$"},
    "rationale_summary": {"type": "string"},
    "floor_plans": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "fp_id": {"type": "string", "pattern": "^[a-z0-9][a-z0-9_]*$"},
          "sub_location": {"type": "string", "pattern": "^[a-z0-9][a-z0-9_]*$"},
          "scope": {"type": "string"},
          "depends_on_fp": {
            "type": "array",
            "items": {"type": "string"}
          }
        },
        "required": ["fp_id", "sub_location", "scope", "depends_on_fp"],
        "additionalProperties": false
      }
    },
    "backgrounds": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "loc_id": {"type": "string", "pattern": "^L[0-9]+$"},
          "space_key_hint": {
            "type": "string",
            "enum": ["main", "kitchen", "rooftop", "stairs", "yard", "exterior", "office"]
          },
          "time_phase": {
            "type": "string",
            "enum": ["dawn", "morning", "day", "dusk", "night"]
          },
          "state_class": {
            "type": "string",
            "enum": [
              "normal", "quiet", "busy", "busy_exit", "ransacked",
              "clean_after", "blood_scene", "intrusion", "arrival",
              "evidence_display", "dream_or_vision_state"
            ]
          },
          "sub_location_label": {"type": "string"},
          "state_label_raw": {"type": "string"},
          "depends_on_fp": {
            "type": "array",
            "items": {"type": "string"},
            "minItems": 1
          },
          "depends_on_bg": {
            "type": "array",
            "items": {"type": "string"}
          },
          "applies_to_shots": {
            "type": "array",
            "items": {"type": "string"}
          }
        },
        "required": [
          "loc_id", "space_key_hint", "time_phase", "state_class",
          "sub_location_label", "state_label_raw",
          "depends_on_fp", "depends_on_bg", "applies_to_shots"
        ],
        "additionalProperties": false
      }
    }
  },
  "required": ["group_id", "rationale_summary", "floor_plans", "backgrounds"],
  "additionalProperties": false
}