ember glow（3ecd94b3）

Use this MotionSites background video as a looping website background asset.
Title: Ember Glow
Category: background
License: 免费
Video URL: https://d8j0ntlcm91z4.cloudfront.net/user_38xzZboKViGWJOttwIXH07lWA1P/hf_20260402_143803_f635b644-d959-4f16-9d29-cedaeb5c6de0.mp4
Local thumbnail: thumbnails/3ecd94b3-a029-4291-b686-1a1155ba8b40.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.