扁平化手绘风世界害虫日蚊虫场景插画海报

Minimalist flat vector poster, environmental pest control theme, soft light cyan to mint green gradient background, large bold Chinese title "世界害虫日" (we'll replace with your slogan) at the top, subtitle text below, clean and simple illustration of a green park scene: two stylized trees (one dark green, one light green), grass at the bottom, light blue abstract water shape, four simple black line-art insects (mosquito, fly) arranged around, a green arc connecting them, natural and eco-friendly atmosphere, solid color blocks, smooth lines, no complex textures, no shadows, high contrast, professional poster design, no logo, no date, 8K, high resolution, sharp edges, printable