*{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;background:#111;color:#eee;font-family:system-ui,sans-serif;overflow:hidden;overscroll-behavior:none}#app{height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.5rem;padding:.5rem}#game-container{width:min(90vw,400px);flex:1 1 auto;min-height:0;display:flex;align-items:center;justify-content:center}#board{background:#000;touch-action:none;border:3px solid transparent;border-image:linear-gradient(135deg,#2979ff,#ff1744) 1}#hud{width:min(90vw,400px);font-size:1rem;display:flex;flex-wrap:wrap;justify-content:center;gap:1rem}#hud canvas{display:block;background:#000;margin-top:.25rem}.overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#000000d9;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1rem;z-index:10}.hidden{display:none}button{padding:.75rem 1.5rem;font-size:1.1rem;cursor:pointer}#touch-controls{width:min(90vw,400px);display:flex;justify-content:center;gap:.5rem}#btn-help{border-radius:50%;padding:.75rem;width:3rem;height:3rem;line-height:1}#tutorial-list{text-align:left;line-height:1.8}#game-container.paused canvas{filter:brightness(.4)}