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This full-screen 'Celebration' effect in Apple Messages fills the viewport with a dense, energetic burst of glowing golden particles. Triggered during message composition, the particles explode from the center, scaling up and drifting outward with a soft bokeh blur. Over several seconds, the particles disperse, losing opacity and dissolving into the dark background, leaving a clean interface. The motion combines rapid expansion with a slow, elegant decay, creating a premium and celebratory atmosphere.
