merge css and scss in laravel mix

This is my code:

mix.js('resources/assets/js/app.js', 'public/js')
   .sass('resources/assets/sass/app.scss', 'resources/assets/css')
   .styles([
     'resources/assets/css/animate.min.css'
   ],'resources/assets/css/style.css')
   .combine(['resources/assets/css/style.css','resources/assets/css/app.css'], 'public/css/app.css');

and results:

\js\app.js   928 kB

\resources\assets\css\app.css   185 kB

\resources\assets\css\style.css  52.8 kB

\css\all.css  52.8 kB

 You can see,It can merge app.css with style.css. output is only style.css as all.css

what is wrong?

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