protected function setClasses()
    {
        $classes = array();

        if (isset($this->current_route['pattern'])) {
            $pattern = $this->current_route['pattern'] ? $this->current_route['pattern'] : 'front';
            foreach (explode('/', $pattern) as $part) {
                if (ctype_alpha($part)) {
                    $classes[] = "gc-$part";
                }
            }
        }

        if ($this->is_maintenance) {
            $classes[] = "gc-maintenance";
        }

        $this->data['_classes'] = $classes;
    }