JSON 进阶模板（推荐给 Agent 调用）

{
  "type": "Movie Poster",
  "theme": "Interstellar Journey",
  "typography": {
    "headline": "BEYOND STARS",
    "subheading": "A New Era Begins",
    "layout": "Centered, bold cinematic font, bottom heavy"
  },
  "visuals": {
    "subject": "Silhouette of an astronaut looking at a glowing nebula",
    "style": "Cinematic lighting, high contrast, dramatic shadows",
    "color_palette": "Deep space blue, glowing orange accents"
  },
  "vibe": "Epic, mysterious, vast"
}