The trick is NOT the prompt. It is one rule: every frame is a pure function of time.
song -> numpy beat grid -> Opus 5.5 writes one HTML file -> Playwright renders -> ffmpeg blends
step 1 -> pick a royalty-free track around 120 BPM
step 2 -> give Opus 5.5 8 to 12 UI states: button, loader, toggle, chart, command palette
step 3 -> one HTML file, 1440x1440, every style computed inside seek(t). no CSS transitions, no timers
step 4 -> springs as closed-form math, so any frame renders in any order
step 5 -> numpy finds the beats, every UI sound lands on a measured peak
step 6 -> Playwright shoots 4 subframes per frame, ffmpeg tmix blends them into 60fps motion blur
step 7 -> render one frame per beat first, fix what is off the grid, then the full render
the math:
120 BPM x 7 bars = 28 beats = 14 seconds
14 s x 60 fps x 4 subframes = 3,360 browser renders
关键不在于提示词，而在于一条规则：每一帧都是时间的纯函数。
歌曲 -> numpy 节拍网格 -> Opus 5.5 生成一个 HTML 文件 -> Playwright 渲染 -> ffmpeg 混合
步骤 1 -> 选择一首约 120 BPM 的免版税曲目
步骤 2 -> 向 Opus 5.5 提供 8 到 12 种 UI 状态：按钮、加载器、开关、图表、命令面板
步骤 3 -> 单个 HTML 文件，尺寸 1440x1440，所有样式在 seek(t) 内计算。不使用 CSS 过渡，不使用定时器
步骤 4 -> 弹簧效果采用闭式数学公式，确保任意帧可按任意顺序渲染
步骤 5 -> numpy 识别节拍，使每个 UI 音效都落在测量到的峰值上
步骤 6 -> Playwright 每帧拍摄 4 个子帧，ffmpeg tmix 将其混合为 60fps 的运动模糊
步骤 7 -> 先按节拍渲染单帧，修正偏离网格的部分，再进行完整渲染
数学计算：
120 BPM x 7 小节 = 28 拍 = 14 秒
14 秒 x 60 fps x 4 子帧 = 3,360 次浏览器渲染
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