Use this MotionSites background video as a looping website background asset. Title: Vapor Trail Category: background License: 免费 Video URL: https://d8j0ntlcm91z4.cloudfront.net/user_38xzZboKViGWJOttwIXH07lWA1P/hf_20260306_074215_04640ca7-042c-45d6-bb56-58b1e8a42489.mp4 Local thumbnail: thumbnails/7dfb4d5d-230f-44ae-9c2b-2684f35e7d78.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.