I've not done any browser testing or responsive design stuff yet so it's likely going to be an absolute mess on mobile right now but I've got the fundamentals and basic functionality working over the past few days.

I've made a build you can play around with if you like React App

Please keep in mind that player search doesn't work yet and the advanced setting don't do anything (though the animation looks sick in my opinion). I'm also planning to make it so the player listings only show players that use your selected hero.