Vintage Key with Book-Shaped Head

Minimalist flat graphic illustration of a vintage-style key. The key’s head is shaped like a tiny open book with clean, simple lines. The book’s pages are filled with an iridescent gradient in soft pearl, opal, and abalone tones. The shaft and teeth of the key are smooth, geometric outlines, kept simple and modern. Style is vector art, flat illustration, graphic design, coquette aesthetic, subtle bookish theme. White background, no shadows, no photorealism, no 3D rendering.