smooth cinematic loop animation of a school banner, text slowly fades out while the building remains visible, then text gently fades back in, very soft opacity transition, no sudden changes, slow and elegant motion, background building stays sharp and stable, subtle light movement across the building, gentle camera breathing effect (slight zoom in and out), seamless loop, text disappears and reappears smoothly, professional youtube background animation, minimal motion, calm and clean style, 4K, ultra smooth