rework popup system
add reset css
finish rework popup system + little css
add first cards animation in backlog
if level is less than 5 complexity is divided by 2
add class when dragEnter for visual drop
add gauge into backlog to user see when loose
add text in first popup
down complexity when level < 5 + improve gauge backlog css
improve new dev visu
add bonus sytem
pause backlog when pause game
css improvement