Split-screen banner composition: LEFT SIDE - old rusty cast-iron radiator in desaturated cold blue-gray tones, cracked paint, poor condition, muted lighting creating negative mood (40% of image). RIGHT SIDE - brand new sleek WH Steel tubular radiator in pristine white, vibrant warm lighting with orange-red gradient background, modern clean design, positive energy (60% of image). Bold diagonal split line separating past/future, dramatic before-after contrast storytelling, sharp focus on new radiator showing premium quality and 2.5mm thick steel construction details. ТЕКСТ НА БАННЕРЕ (СТРОГО НА РУССКОМ): "Дизайн-радиатор WH от 11 000 ₽". High-impact visual narrative driving upgrade psychology.