Create a simple flat icon for a mobile app user role. Icon: person with a checklist or clipboard, representing a customer placing an order. Style: flat design with long shadow effect, rounded square background (like iOS app icon), background color #E3F2FD (light blue), icon color #1565C0 (dark blue) and white. Size: 1024x1024px. No text. Clean, minimal, professional. Same style as construction helmet with brick wall flat icon.