High-resolution image of a girl inspired by Steins;Gate, holding a cat while talking on a smartphone. She has a shy and blushing expression, reflecting a sense of nervousness and affection. The girl's casual outfit is in soft, pastel colors like light pink, lavender, and pale yellow. Her hair is slightly messy and tousled, adding to her character's intellectual and slightly rebellious look. The cat she is holding is also in soft, complementary pastel colors. The background is abstract and features muted pastel hues, enhancing the overall serene and whimsical atmosphere of the image. Ultra-detailed, high-resolution, with smooth lines and gentle shading to emphasize the pastel aesthetic.