App 更新公告方形

Square 1:1 social media announcement card. Soft mint-to-lavender pastel gradient background. Centered upper area shows a clean flat illustration of an abstract floating mobile app icon (rounded square with a generic dashboard symbol inside, soft drop shadow). Below the icon a two-line bold sans-serif headline reads "Brand new home screen — Now live". Bottom shows a thin pill-shaped CTA button reading "See What's New". Generous whitespace, modern flat illustration aesthetic. No real brand name, no logo, no watermark. Crisp typography rendering, premium social ad design quality.