A professional, high-contrast book cover for an audiobook titled "Înger și demon" (Angel and Demon) by Sidney Sheldon. The visual style should be a dramatic, cinematic thriller with a touch of gothic elegance. The main imagery features a split composition: on one side, a silhouette of a radiant angel with subtle, glowing wings, embodying purity and hope. On the other side, a shadowed, menacing figure of a demon with sharp, angular features and smoldering eyes, representing darkness and corruption. Between them, a single, dramatic line or crack that symbolizes their intertwined destinies and the conflict between them. Subtle elements like swirling dark smoke or ethereal light could be incorporated to enhance the mood. The color palette should be a stark contrast between deep, velvety blacks, fiery reds, and stark whites or pale golds. The mood is intense, suspenseful, and slightly ominous. Composition should be balanced but dynamic, with the figures facing each other or in a powerful stance of confrontation. A subtle texture that suggests ancient paper or leather could be applied. The overall aesthetic should be striking and instantly communicate the thriller genre and the duality of the title. Aspect ratio: 1024x1024.