A calm, cinematic ambient background video designed for long music live streams. Slow and smooth camera movement, no sudden cuts. Abstract city lights, soft gradients, subtle light particles floating in the air. Warm and cool tones balanced, slightly dreamy atmosphere. Minimal motion, loop-friendly, relaxing and aesthetic. No people, no text, no logos. High quality, cinematic lighting, depth of field. Feels like a modern digital art installation. 8 seconds.