{
  "schema_version": 1,
  "chart_type": "matrix",
  "mark": "heatmap",
  "meta": {
    "title": "Support Tickets by Day and Shift",
    "quality_profile": "showcase"
  },
  "data": {
    "columns": [
      { "id": "shift", "type": "string",
        "values": ["Morning", "Morning", "Morning", "Morning", "Morning", "Morning", "Morning",
                   "Afternoon", "Afternoon", "Afternoon", "Afternoon", "Afternoon", "Afternoon", "Afternoon",
                   "Night", "Night", "Night", "Night", "Night", "Night", "Night"] },
      { "id": "day", "type": "string",
        "values": ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun",
                   "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun",
                   "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"] },
      { "id": "tickets", "type": "number", "unit": "tickets",
        "values": [48, 41, 39, 37, 44, 12, 9,
                   62, 55, 51, 49, 58, 18, 14,
                   21, 17, 15, 16, 24, 8, 6] }
    ]
  },
  "encoding": {
    "row": { "column": "shift" },
    "column": { "column": "day" },
    "value": { "column": "tickets" }
  },
  "scale": { "kind": "sequential" },
  "cards": [
    { "title": "Takeaway", "items": ["Afternoon shifts carry the heaviest load every weekday, peaking Monday.", "Weekend volume drops to roughly a fifth of weekday volume across all shifts."] }
  ]
}