内置背景图来源与许可（均可商用）
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选型原则：实拍光斑 / 纹理 / 柔和虚化，适合毛玻璃字幕条；避免纯色渐变与细节过实的实景。

1. city_night_bokeh.jpg
   Unsplash — https://unsplash.com/photos/oVB0A8Br0mI
   License: Unsplash License

2. blue_street_bokeh.jpg
   Unsplash — https://unsplash.com/photos/ftHKGXCyQiQ
   License: Unsplash License

3. warm_fairy_lights.jpg
   Pexels — Madison Inouye
   https://www.pexels.com/photo/3728297/
   License: Pexels License

4. green_nature_bokeh.jpg
   Unsplash — xiao ying (@zh369_)
   https://unsplash.com/photos/0CV-4dIL_eI
   License: Unsplash License

5. blue_marble.jpg
   Unsplash — Aleksandra Khaprenko (@xaprrr)
   https://unsplash.com/photos/0PPw9irzLIw
   License: Unsplash License

6. soft_clouds.jpg
   Unsplash — https://unsplash.com/photos/P8VMwYFY-Es
   License: Unsplash License

7. warm_light_flare.jpg
   Unsplash — Liana S (@cherstve_pechivo)
   https://unsplash.com/photos/kWEW965_5Y0
   License: Unsplash License

Unsplash License: https://unsplash.com/license
Pexels License: https://www.pexels.com/license/
