thermal glow

Use this MotionSites background video as a looping website background asset.
Title: Thermal Glow
Category: background
License: 免费
Video URL: https://d8j0ntlcm91z4.cloudfront.net/user_38xzZboKViGWJOttwIXH07lWA1P/hf_20260324_151826_c7218672-6e92-402c-9e45-f1e0f454bdc4.mp4
Local thumbnail: thumbnails/6fc06197-eac1-49fe-a89a-50c71e325df2.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.