One sheet of paper. Two living dragons.

Create a stunning, cinematic, interactive 3D animation as one complete HTML file: ORIGAMI DRAGON METAMORPHOSIS. Begin with a single square sheet of metallic paper floating above a carved stone pedestal in a moonlit Japanese temple courtyard. The paper must visibly fold through multiple coherent stages—creases, angular intermediate forms, articulated head, wings, legs and tail—until it becomes an elegant, highly detailed origami dragon. Do not hide the transformation with a cut, flash, fade or camera obstruction: the folding process itself must remain clearly visible and spatially continuous. After forming, the dragon must awaken, unfold and articulate its wings, launch from the pedestal, fly a complete cinematic path around the courtyard, bank and turn naturally, move its segmented tail, and breathe a luminous stream of fire made from thousands of dynamic particles that illuminate the dragon and environment. Add drifting embers, paper fibers, mist, moonlight, moving shadows, reflective metallic folds, torii gates, stone lanterns and wind-blown foliage. The dragon must return to the pedestal and visibly unfold back into the original square sheet for a seamless loop. Technical and interaction requirements: - True 3D perspective rendered with WebGL; Three.js from a public CDN is allowed, but all scene code, shaders, styles and UI must be contained in this one HTML file. - Use procedural geometry only: no downloaded 3D models, images, textures, video or other external art assets. - Use at least 20,000 animated particles across fire, embers, atmospheric dust and transformation accents. - Smooth animation targeting 60 fps with adaptive quality if necessary. - Cinematic bloom, depth, fog, shadows and color grading. - Slow automatic camera movement plus mouse/touch drag to orbit and wheel/pinch to zoom. - Include camera presets, including a button named HERO VIEW, and a subtle HUD showing FPS, particle count, camera azimuth and elevation. - Make the composition beautiful, mysterious and production-quality on desktop and mobile. Output only the complete HTML file in a single fenced html block, with no omitted sections or placeholder code.