*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;overflow:hidden;background:#0a0a15}#app{position:relative;width:100vw;height:100vh}#gameCanvas{display:block;width:100%;height:100%;position:absolute;top:0;left:0;z-index:10;background:transparent}#uiContainer{position:absolute;top:0;left:0;width:100%;height:100%;pointer-events:none;z-index:20}.screen{position:absolute;top:0;left:0;width:100%;height:100%;display:flex;flex-direction:column;justify-content:center;align-items:center;color:#fff;pointer-events:auto;opacity:1;transition:opacity .3s ease;z-index:20}#menuScreen,#pauseScreen,#gameOverScreen,#modeSelectScreen,#multiplayerModeScreen,#matchmakingScreen,#privateLobbyScreen{background:#000000d9}.primary-button{padding:1rem 3rem;font-size:1.2rem;font-weight:700;color:#fff;background:linear-gradient(135deg,#667eea,#764ba2);border:none;border-radius:50px;cursor:pointer;transition:transform .2s,box-shadow .2s;box-shadow:0 4px 15px #667eea66;margin:.5rem}.primary-button:hover{transform:scale(1.05);box-shadow:0 6px 20px #667eea99}.primary-button:active{transform:scale(.98)}.secondary-button{padding:.75rem 2rem;font-size:1rem;font-weight:700;color:#fff;background:#ffffff1a;border:2px solid rgba(255,255,255,.3);border-radius:50px;cursor:pointer;transition:transform .2s,background .2s;margin:.5rem}.secondary-button:hover{transform:scale(1.05);background:#fff3}.secondary-button:active{transform:scale(.98)}.join-url{padding:1rem;background:#ffffff1a;border-radius:10px;font-family:monospace;font-size:.9rem;max-width:90%;word-break:break-all;margin:1rem 0}.status-message{margin-top:1rem;font-size:1rem;color:#667eea;min-height:1.5rem}.screen.hidden{opacity:0!important;pointer-events:none!important;display:none!important}.screen h1{font-size:3rem;margin-bottom:1rem;text-shadow:0 0 20px rgba(255,255,255,.5)}.screen p{font-size:1.2rem;margin-bottom:2rem;color:#ccc;max-width:500px;text-align:center;padding:0 20px}.screen button{padding:1rem 3rem;font-size:1.2rem;font-weight:700;color:#fff;background:linear-gradient(135deg,#667eea,#764ba2);border:none;border-radius:50px;cursor:pointer;transition:transform .2s,box-shadow .2s;box-shadow:0 4px 15px #667eea66}.screen button:hover{transform:scale(1.05);box-shadow:0 6px 20px #667eea99}.screen button:active{transform:scale(.98)}#splashScreen{background:transparent;padding:20px;z-index:1}.splash-image-container{width:100%;height:100%;display:flex;justify-content:center;align-items:center}.splash-image{display:block;max-width:100%;max-height:100%;object-fit:contain;animation:fadeIn .5s ease-in;opacity:1;transition:opacity .5s ease}.splash-image.dimmed{opacity:.25}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}