Develop an intriguing book cover for a science fiction novel. The scene depicts a futuristic city at night, with glowing skyscrapers and flying cars crossing the dark sky. In the center of the cover, a pair of protagonists gazes at the city from a terrace, exchanging a look filled with hope and mystery. The book title, "Horizons Beyond," should be displayed in elegant letters that blend with the city lights. The color palette consists mainly of dark blues, deep purples, and neon accents. This is a portrait of the characters' relationship and the possibilities of the world around them. Detailed digital illustration, --ar 16:9 --v 5.

(nsfw:1.5),verybadimagenegative_v1.3, ng_deepnegative_v1_75t, (ugly face:0.8),cross-eyed,sketches, (worst quality:2), (low quality:2), (normal quality:2), lowres, normal quality, ((monochrome)), ((grayscale)), skin spots, acnes, skin blemishes, bad anatomy, DeepNegative, facing away, tilted head, {Multiple people}, lowres, bad anatomy, bad hands, text, error, missing fingers, extra digit, fewer digits, cropped, worstquality, low quality, normal quality, jpegartifacts, signature, watermark, username, blurry, bad feet, cropped, poorly drawn hands, poorly drawn face, mutation, deformed, worst quality, low quality, normal quality, jpeg artifacts, signature, watermark, extra fingers, fewer digits, extra limbs, extra arms,extra legs, malformed limbs, fused fingers, too many fingers, long neck, cross-eyed,mutated hands, polar lowres, bad body, bad proportions, gross proportions, text, error, missing fingers, missing arms, missing legs, extra digit, extra arms, extra leg, extra foot, ((repeating hair))