Create a vibrant hyper-detailed illustration of a retrofuturistic metropolis where Art Nouveau meets cyberpunk, bathed in warm golden-hour sunlight. Massive Art Deco-inspired zeppelins, adorned with intricate brass filigree and crystalline observation decks, float majestically through a cerulean sky dotted with cumulus clouds. The cityscape features a dramatic mix of gleaming chrome-and-glass skyscrapers with impossible geometries and ornate Victorian architecture, their surfaces reflecting prismatic light patterns. A winding azure river, reminiscent of classical oil paintings, bisects the urban landscape, its banks lined with cobblestone promenades and ornamental wrought-iron gaslamps emitting a soft cyan glow. Crowds in a striking blend of contemporary business attire and elaborate steampunk fashion - including top hats, brass goggles, and leather waistcoats - gather along emerald grass embankments. The scene is rendered in a cinematic 16:9 aspect ratio with atmospheric perspective, featuring ray-traced lighting effects and photorealistic textures. The composition follows the rule of thirds, with leading lines drawing the eye from the detailed foreground elements toward the awe-inspiring airships. The color palette combines rich sepia tones with electric teals and metallic golds, creating a harmonious blend of vintage and futuristic aesthetics. Rendered in the style of Studio Ghibli meets Syd Mead, with hints of art by John Harris and Craig Mullins, 8k resolution, volumetric lighting, ambient occlusion.