Widescreen YouTube channel banner 2560x1440 for jazz lounge, dark warm gradient background from deep navy blue to rich charcoal, soft golden ambient light spreading from center, subtle smoke and warm bokeh lights, elegant jazz club atmosphere, large text in bottom left corner "Gregory Jazz Lounge" in gold and white, small saxophone silhouette in background (blurred, artistic), cinematic lighting, luxurious, professional, high contrast, 8k, no watermark, 16:9
