create a modern and sleek app icon for the qrcode brand pro application, featuring a stylized combination of a qr code and a professional logo element, set against a clean and simple background, with a dominant color scheme of deep blues and whites, and bold sans-serif font with the initials QB or a stylized QR pattern incorporated into the design, incorporating subtle gradients and shadow effects to give the icon a sense of depth and dimension, with the qr code element possibly being integrated into a shield or a badge to convey a sense of security and professionalism, and the overall design being optimized for various mobile platforms and screen resolutions.