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After · Noise 颗粒 渐变上叠 SVG feTurbulence 颗粒 + 低频烟雾纹理，插画用 mask 只给图形加颗粒，全页一层 canvas 动态胶片颗粒（prefers-reduced-motion 时静止）。 / SVG feTurbulence grain + smoke on gradients, masked grain on art, ~12fps canvas film grain (static if reduced motion). Hand-written, no lib. Press b to flip.

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