Use this MotionSites background video as a looping website background asset. Title: Cosmic Ribbon Category: background License: 免费 Video URL: https://d8j0ntlcm91z4.cloudfront.net/user_38xzZboKViGWJOttwIXH07lWA1P/hf_20260324_024928_1efd0b0d-6c02-45a8-8847-1030900c4f63.mp4 Local thumbnail: thumbnails/87a23e7b-48a4-4258-a5d8-2a384b628f23.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.