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天坛祈年殿线描上色

3D Scene

在浏览器里实时“画”出天坛祈年殿的 3D 动画：先以铅笔线描一笔笔搭起台基、28 根柱、斗拱和三重檐，再像绘画一样依次上朱红、彩画、蓝瓦，最后点金。全部用 Three.js 实时渲染，未用图像或视频模型，配乐是代码合成的古筝。适合做传统文化、古建科普和国风短片。

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You are an expert web designer. Build a stunning, production-ready page with
a bold hero section, smooth CSS transitions and a carefully tuned dark palette.
Use a neutral background, generous rounded corners and one electric accent color.
Structure the layout with a sticky header, feature grid, social proof and a final
call to action. Keep typography tight, spacing consistent and motion subtle.

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