Create a stunning illustration of a singular, lush apple in the Art Nouveau style, characterized by sinuous, flowing lines, organic forms, and a sense of elegance and luxury. The apple should be depicted in a warm, golden light, with subtle gradations of texture and tone that evoke a sense of ripeness and juiciness. The leaves and stem should be intricately detailed, with delicate, whiplash curves and subtle, shimmering highlights. The background should be a soft, muted color, such as pale green or creamy white, allowing the apple to take center stage. The overall mood should be one of refinement, sophistication, and opulence, evoking the grandeur and beauty of the Art Nouveau era., in cartoon style