I don’t remember but chatgpt does:

You’re not misremembering at all — Blade Runner (1982) definitely includes Art Nouveau influences, though it’s more subtle and mixed in with other architectural styles, especially Art Deco, futurist cyberpunk, and brutalism.

The most prominent example of Art Nouveau is Sebastian’s apartment, with its ornate interiors, curving lines, and whimsical, decorative elements. You can also see flourishes of it in some of the neon signage, detailing in the buildings, and the organic-mechanical fusion that defines the film’s aesthetic. Director Ridley Scott and the design team drew on a wide range of architectural and visual influences to create that dense, layered urban landscape — Art Nouveau was definitely part of that visual stew.