Create ONE standalone premium website background, ultrawide 21:9, highest available native detail. Collection: Coastal address. Intended use: Closing call-to-action background. Scene and composition: Very wide open whitewashed terrace framed by soft linen curtains at both outer edges, uninterrupted tranquil sea and sky through center, pale stone foreground for CTA. Style: Premium photorealistic coastal residential architecture photography. Whitewashed mineral plaster, pale natural stone, soft sea-glass water, sandy beige, weathered oak. Luminous marine atmosphere, gentle sea haze, restrained resort-like calm, realistic structural details and natural Mediterranean planting. Keep generous intentional negative space suited to this composition. Exquisite art direction, natural optics, very fine film grain, believable proportions and surfaces. This is an IMAGE ASSET, not a website screenshot. No words, numbers, lettering, logos, watermarks, UI, borders, collages or inset pictures. Do not add a title or any typography.