Diseño de Póster Moderno Azul Estilo Suizo

Generate a clean, Google-style modern poster on a warm white background using a strict grid, generous whitespace, and bold Helvetica/Google Sans–like typography, with a subtle abstract geometric accent in Google primary colors (blue #4285F4, red #EA4335, yellow #FBBC05, green #34A853) in the top-left, and the exact text centered-left with clear hierarchy: “PRODUCTIVITY SUMMIT 2026” (huge bold), “Work smarter with AI + design systems” (medium), “March 12, 2026 • 10:00 AM • San Francisco” (small), and a bottom CTA “REGISTER NOW” inside a simple rounded rectangle, plus a small empty QR placeholder box bottom-right; output 1080×1350, ultra-sharp, high contrast, minimal, no mockup, no extra text, no logos, no watermark.