A red castle stands on a dark rocky mountain with a bright full moon behind. Its sharp towers and small illuminated windows contrast vividly against the deep blue and purple night sky. Behind the castle, a large, luminous full moon rises, casting a cool glow on the surrounding mountainous silhouettes. The mountain layers fade into the background, creating depth and a serene yet mysterious atmosphere. The color scheme blends dark blues and purples with vibrant highlights from the castle and moon, emphasizing the nighttime setting and the castles imposing presence.