background 05（c5752ec9）

Use this MotionSites background video as a looping website background asset.
Title: Background 05
Category: background
License: 免费
Video URL: https://d8j0ntlcm91z4.cloudfront.net/user_38xzZboKViGWJOttwIXH07lWA1P/hf_20260418_115655_b4d9cd77-feed-43cd-a198-af78ebdf1f7a.mp4
Local thumbnail: thumbnails/c5752ec9-01a2-44fd-81b4-0a41d79b5025.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.