气球之城

风格提示词：

cinematic European comic illustration, strong expressive ink linework, refined Franco-Belgian comic elegance, illustrated travel book from another era, dreamy scale of classic sci-fi illustration, huge atmospheric environments, endless sky, distant layered landscapes, poetic retro-futurist worldbuilding, quiet cinematic storytelling, nostalgic and slightly melancholic mood, restrained warm palette with soft cool contrasts, hand-drawn architectural detail, delicate contour lines, airy perspective depth, elegant environmental composition, visual novel atmosphere, atmospheric animation background concept art, subtle literary stillness, grand scenery overwhelming tiny human presence, non-glossy, non-photorealistic, not childish, not manga comedy, not modern game UI, no text, no watermark