{
  "contents": [
    {
      "role": "user",
      "parts": [
        {
          "text": "Create a premium advertising keyframe for an invented brand called Aster: one matte cobalt reusable bottle with a plain unmarked body, standing upright on a pale stone plinth. Soft daylight from camera left, subtle rim light, realistic material, three-quarter product view, clean warm-grey studio background. Keep the bottle silhouette undistorted. Reserve the upper-right quarter as uncluttered negative space for separately composited copy. Landscape composition. No people, no lettering, no watermark-like graphic, no extra bottle, no medical or environmental claims."
        }
      ]
    }
  ],
  "generationConfig": {
    "responseModalities": [
      "TEXT",
      "IMAGE"
    ],
    "imageConfig": {
      "aspectRatio": "16:9"
    }
  }
}