{
  "$schema": "urn:prism:schema:v1:spec",
  "title": "Quarterly revenue — theme category_styles by quarter",
  "data": {
    "values": [
      {"quarter": "Q1", "revenue": 120},
      {"quarter": "Q2", "revenue": 145},
      {"quarter": "Q3", "revenue": 138},
      {"quarter": "Q4", "revenue": 172}
    ]
  },
  "mark": "bar",
  "encoding": {
    "x": {"field": "quarter", "type": "nominal"},
    "y": {"field": "revenue", "type": "quantitative"}
  },
  "theme": {
    "name": "light",
    "category_styles": {
      "quarter": {
        "Q1": {"fill": "#4c78a8"},
        "Q2": {"fill": "#f58518"},
        "Q3": {"fill": "#54a24b"},
        "Q4": {"fill": "#e45756"}
      }
    }
  }
}