background 03（cbcac203）

Use this MotionSites background video as a looping website background asset.
Title: Background 03
Category: background
License: 付费
Video URL: https://d8j0ntlcm91z4.cloudfront.net/user_38xzZboKViGWJOttwIXH07lWA1P/hf_20260421_072701_f6a01abb-eb30-4559-9d6e-774362defbc3.mp4
Local thumbnail: thumbnails/cbcac203-8074-4576-bfe8-24abd6235bb8.jpg
Implementation requirements:
- Render the video as a muted, autoplay, looped, playsInline background layer.
- Use object-fit: cover and keep the focal motion visible on desktop and mobile.
- Add a readable overlay only when foreground text needs contrast.
- Keep controls hidden for decorative background use, and provide a poster/thumbnail fallback.
- Respect the MotionSites authorization state before using this asset in a commercial project.