Generate a set of vector hibiscus flowers with a minimalist design. Ensure each flower has a gray, unfilled stem and dark red petals. Simplify the details for a clean and elegant appearance. These flowers are intended for use in a product design, so make sure the stem is gray without fill, and the petals are a deep, dark red. Ensure easy integration and a seamless standout. #VectorFlowers #MinimalistDesign #Hibiscus