Use this MotionSites background video as a looping website background asset. Title: Motion BG 57 Category: background License: 免费 Video URL: https://d8j0ntlcm91z4.cloudfront.net/user_38xzZboKViGWJOttwIXH07lWA1P/hf_20260422_191657_800d4e1f-7ab3-41af-90b6-9bd3039eb294.mp4 Local thumbnail: thumbnails/9afea34a-841d-4513-bbed-ce30a2288488.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.