Membretes profesionales estilo art déco monocromo A4

Print-ready letterhead template for membretes profesionales (tech / SaaS). Company brief: membretes profesionales. Style: art deco, monochrome elegant palette. Header band with placeholder logo + company name. Footer strip with placeholder address, phone, email, website, registration number. Watermark: subtle logo mark. Generous text area for body copy. A4 portrait, no watermarks (other than chosen design). No real registration numbers or addresses — use clean placeholders. No fake government seals. Target search intent (rendered visually, no on-image text): "membretes profesionales" (es).