发光峡谷上空的漂浮古神殿，纯程序化 Three.js 场景

Build a real-time Three.js scene in a single self-contained HTML file with no external assets: everything must be generated procedurally in code. Show an ancient stone temple with columns and a pitched roof standing on a floating rock island whose underside tapers into a jagged point. Add glowing cyan rune lines along the stonework, lit braziers and hanging banners that move as cloth in the wind. Surround it with floating rock fragments, chains and distant rock spires above a canyon filled with glowing red-orange haze. Set it at dusk with a low sun, purple-orange sky, volumetric god rays and occasional lightning. Open with an elegant title card, then run a slow cinematic camera that moves from the temple front, along the island and underside, to a wide shot of the whole canyon. Done means smooth real-time rendering in a desktop browser with continuous wind, light shafts and drifting debris.