GPT-6 Luna in a raw API call

Koi Pond Garden: A calm, interactive Japanese garden seen from above at a gentle three-quarter angle, centred on a koi pond. The water must read as clear and refractive: you can see the pebbled pond floor and the koi through it, distorted by soft ripples, with caustic light patterns moving across the bottom and a subtle surface reflection and sheen. At least seven koi with detailed, varied patterned skin (kohaku, showa, ogon, tancho and similar), flowing fins and tails, swim naturally in smooth, unhurried curves, avoid each other and the pond edge, and occasionally rise near the surface. Surround the pond with natural stones and mossy rocks of varied shapes and textures, grasses, a few plants and flowers, floating lily pads (some with blossoms), and at least one small stone lantern or similar garden detail. Lighting should be warm and soft, with believable shadows.

Interaction: clicking or tapping the water drops a few food pellets that splash, float and slowly sink; nearby koi notice them, swarm toward them and visibly eat them (each pellet disappears when a fish reaches it), then disperse. At least two frogs sit on lily pads; clicking or tapping a frog makes it leap in an arc to another pad or into the water with a splash and rings of ripples. Clicking the water anywhere also sends out ripples. The camera can be orbited gently with a drag and zoomed within limits, but must not flip under the ground.

Build it as ONE self-contained HTML file with inline CSS and JavaScript. You may load three.js (and its addons) from a public CDN via an import map or script tag; no other external requests (no image, texture, model or audio files): make every texture and shape in code (procedural canvas textures, shaders or geometry). It must work when opened directly from disk in a current desktop or mobile browser, support both mouse and touch, fit the window responsively, keep a smooth frame rate, and run without console errors. Output ONLY the complete HTML file, starting with <!DOCTYPE html> and ending with </html>, with no explanation or markdown fences.

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