暗夜紫色光带

Use this MotionSites background video as a looping website background asset.
Title: Motion Background 16
Category: background
License: 付费
Video URL: https://stream.mux.com/9njY8qDfS02Uvbll018C8CK39p5EksK7mn02DDC1zYvppI.m3u8
Local thumbnail: thumbnails/f5d3ac80-1840-42b4-84e9-5d8c48ba78d7.png
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.