Design a modern and minimalist icon of a smartphone with a glowing screen, depicting a messaging app open, featuring two chat bubbles inside. The icon should have a sleek, rounded rectangular shape with a soft gradient background in pastel colors, and the smartphone should have a subtle shadow to give it depth. Use a clean and simple line art style for the phone and the chat bubbles, ensuring the design is easily recognizable at various sizes.

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Design a modern and minimalist icon of a smartphone with a glowing screen, depicting a messaging app open, featuring two chat bubbles inside. The icon should have a sleek, rounded rectangular shape with a soft gradient background in pastel colors, and the smartphone should have a subtle shadow to give it depth. Use a clean and simple line art style for the phone and the chat bubbles, ensuring the design is easily recognizable at various sizes.