"Design a modern logo for 'TransmiBand,' a wristband used for contactless payments in public transportation (Transmilenio in Colombia). The logo should feature a sleek and stylized wristband in the center, with subtle waves emanating from it to represent wireless payment technology. Include a small, minimalist bus or metro icon near the wristband to hint at public transportation. Use a vibrant color palette with red, gray, and green tones to represent urban mobility and modernity. The typography should be smooth, fluid, and contemporary, reflecting ease of use and quickness." --s 750