Beachside amphitheater, constructivist architecture style, curved lines, geometric shapes, modern materials, glass, steel, concrete, angular pillars, stairs, ramps, bold color schemes, vibrant beach balls, lifeguards, sailboats, surfboards, seagulls flying overhead, sunny day, clear blue sky, fluffy white clouds, gentle sea breeze, waves crashing against the shore, sandy dunes, beach towels, sunglasses, summer hats, people relaxing, playing, or exercising in the background, panoramic view, low-angle shot, dramatic lighting, bold composition, 3D rendering.