Creating a responsive menu system for a site with a lot of content I am currently creating a website which has a lot of content - text. For this I need a serious menu structure with 5-10 menu items per menu and at least 15 menu-blocks per main menu item. 

Further it has to be accessible via mobile. 

Till now I have used panels and added menus inside the panels. But mobile isn't to happy about that and the list-names in the menus overlap the content. 

How would you go about solving this issue? I trust you experts here! :-)
for creating responsive menu you have lots of projects 

below are some 

https://www.drupal.org/project/responsive_menus

https://www.drupal.org/project/responsive_navigation

https://www.drupal.org/project/responsive_dropdown_menus

https://www.drupal.org/project/responsive_menu

try any one will help you out.