export default defineConfig({
  shortcuts: [
    ['root', 'selector-[:root]:[--varname:200,0,0]']
  ],
  theme: {
    colors: {
      // ...
      'veryCool': '#0000ff',
      'mainColor': 'rgb(253, 230, 139)',
			'cv': 'rgb(var(--varname))'
    },
    container: {
      center: true,
    }
  },
}

• 这个配置，varname 不生效

• mainColor 写成 main-color 不生效，可能不支持 kebab-case

According to the provided configuration, Unocss does not support camelCase custom color names. The custom color name 'mainColor' should be written in kebab-case as 'main-color' instead. Additionally, the variable 'varname' is not working as expected in this configuration.