报错：

[postcss] It looks like you're trying to use `tailwindcss` directly as a PostCSS plugin. The PostCSS plugin has moved to a separate package, so to continue using Tailwind CSS with PostCSS you'll need to install `@tailwindcss/postcss` and update your PostCSS configuration.

报错原因：tailwindcss升级v4后，PostCSS 插件已移至单独的包中

解决方法：安装“@tailwindcss/postcss”，并修改配置文件

• 安装postcss包

npm install -D @tailwindcss/postcss

• 修改postcss.config.js

module.exports = {
  plugins: {
    '@tailwindcss/postcss': {},
    autoprefixer: {},
  },
}

注意tailwindcss 插件已被替换为 @tailwindcss/postcss

npm run dev 重新启动后报错消失了，但是css样式未生效

• 在globals.css导入

@tailwind utilities;
@import "tailwindcss";

问题就解决了