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逐帧确定性渲染蝴蝶动画

Motion Graphics

以 X 光风格蝴蝶演示“每一帧只由帧号决定”的代码视频方法：固定画布、无窗口引擎按帧号调用绘制函数、ffmpeg 编码，再做三轮自动检查。示例循环 720 帧、12 秒，首帧与末帧逐像素一致。适合做技术方法讲解、动效制作流程分享和开发者向科普短片。

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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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