*{margin:0;padding:0;box-sizing:border-box}html,body{width:100%;height:100%;overflow:hidden;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}#app{width:100%;height:100%;display:flex;flex-direction:column;background-color:#1a1a1a;color:#fff;min-width:768px}#game-canvas{flex:1;display:block;background-color:#2d2d2d;margin:0 auto;max-width:100%;max-height:100%}#ui-container{position:relative;width:100%;padding:1rem;background-color:#252525;border-top:2px solid #3a3a3a;display:flex;flex-direction:column;gap:1rem}@media(max-width:768px){#app{min-width:768px}#ui-container{padding:.75rem;gap:.75rem}}.button{padding:.5rem 1rem;font-size:1rem;font-weight:600;border:none;border-radius:4px;cursor:pointer;transition:background-color .2s ease}.button:hover{opacity:.9}.button:active{transform:translateY(1px)}.button-primary{background-color:#4caf50;color:#fff}.button-secondary{background-color:#2196f3;color:#fff}.button-danger{background-color:#f44336;color:#fff}.display-panel{padding:.75rem;background-color:#333;border-radius:4px;font-size:.95rem}.notification-overlay{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);padding:2rem 3rem;background-color:#000000e6;border:3px solid #4CAF50;border-radius:8px;font-size:2rem;font-weight:700;text-align:center;z-index:1000;animation:fadeIn .3s ease}@keyframes fadeIn{0%{opacity:0;transform:translate(-50%,-50%) scale(.9)}to{opacity:1;transform:translate(-50%,-50%) scale(1)}}.error-display{padding:1rem;background-color:#d32f2f;color:#fff;border-radius:4px;font-weight:600;text-align:center}.hidden{display:none!important}