public function renderStyles()
    {
        $this->loadPackageCss();

        if (empty($this->styles)) {
            return PHP_EOL;
        }

        $assets = [];

        foreach ($this->sort($this->styles) as $handle => $data) {
            $assets[] = $this->getCss($handle);
        }

        return implode(PHP_EOL, $assets);
    }