Create a high-resolution, abstract ambient background in cool blues (navy → royal → light blue). No objects, people, or text. Use a soft vertical gradient with subtle wave/bokeh texture: the top 60% should be distinctly darker for white text readability; the bottom 40% should fade toward near-white so it visually blends into the next white section. Add a slight vignette on the sides, preserve generous centered negative space for headings, and avoid busy patterns. Include light film grain/dither to prevent b

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