*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background:#0a0a0f;color:#fff;overflow:hidden}#game-container{width:100vw;height:100vh;position:relative}#game-canvas{width:100%;height:100%;display:block}#hud{position:absolute;top:20px;left:20px;display:flex;flex-direction:column;gap:20px;pointer-events:none;z-index:100}#score-container,#level-container,#lines-container,#next-piece-container{background:#000000b3;border:2px solid rgba(0,255,255,.5);border-radius:10px;padding:15px 25px;min-width:150px;box-shadow:0 0 20px #0ff3}.hud-label{font-size:12px;color:#0ff;letter-spacing:2px;margin-bottom:5px}#score,#level,#lines{font-size:32px;font-weight:700;color:#fff;text-shadow:0 0 10px rgba(255,255,255,.5)}#next-piece-preview{width:100px;height:100px;margin-top:10px}#controls-help{position:absolute;bottom:20px;right:20px;background:#000000b3;border:2px solid rgba(255,0,255,.5);border-radius:10px;padding:15px 20px;font-size:11px;pointer-events:none;z-index:100;box-shadow:0 0 20px #f0f3}.help-title{font-size:12px;color:#f0f;letter-spacing:2px;margin-bottom:10px;border-bottom:1px solid rgba(255,0,255,.3);padding-bottom:5px}.help-section{margin:5px 0;color:#aaa}.key{display:inline-block;background:#ffffff1a;padding:2px 6px;border-radius:3px;color:#fff;margin-right:5px;font-family:monospace}#menu,#pause-menu{position:absolute;top:0;left:0;width:100%;height:100%;display:flex;justify-content:center;align-items:center;z-index:200;background:#000000d9;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);transition:opacity .3s ease}#gameover-menu{position:absolute;top:0;left:0;width:100%;height:100%;display:flex;justify-content:center;align-items:center;z-index:200;background:#00000080;transition:opacity .3s ease;pointer-events:none}#gameover-menu.menu-visible{opacity:1}#gameover-menu #gameover-content{pointer-events:auto}.menu-visible{opacity:1;pointer-events:auto}.menu-hidden{opacity:0;pointer-events:none}#menu-content,#pause-content,#gameover-content{text-align:center;animation:fadeIn .5s ease;pointer-events:auto;position:relative;z-index:210}@keyframes fadeIn{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}.game-title{font-size:72px;font-weight:700;background:linear-gradient(135deg,#0ff,#f0f,#ff0);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;text-shadow:none;margin-bottom:10px;letter-spacing:5px}.game-subtitle{font-size:24px;color:#888;margin-bottom:50px;letter-spacing:3px}.menu-title{font-size:48px;color:#fff;margin-bottom:40px;text-shadow:0 0 20px rgba(255,255,255,.5)}.menu-button{display:block;width:250px;margin:15px auto;padding:15px 30px;font-size:18px;font-weight:700;color:#fff;background:transparent;border:2px solid #00ffff;border-radius:5px;cursor:pointer;letter-spacing:2px;transition:all .3s ease;pointer-events:auto;position:relative;z-index:220}.menu-button:hover{background:#0ff3;box-shadow:0 0 30px #00ffff80;transform:scale(1.05)}.menu-button:active{transform:scale(.98)}#final-score-container{margin-bottom:40px}.final-label{font-size:16px;color:#0ff;letter-spacing:2px;margin-bottom:10px}#final-score{font-size:64px;font-weight:700;color:#fff;text-shadow:0 0 20px rgba(255,255,255,.5)}.combo-notification{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-size:48px;font-weight:700;color:#ff0;text-shadow:0 0 30px rgba(255,255,0,.8);animation:comboPopup 1s ease forwards;pointer-events:none;z-index:150}@keyframes comboPopup{0%{opacity:0;transform:translate(-50%,-50%) scale(.5)}20%{opacity:1;transform:translate(-50%,-50%) scale(1.2)}to{opacity:0;transform:translate(-50%,-70%) scale(1)}}.line-clear-effect{position:absolute;width:100%;height:100%;top:0;left:0;background:radial-gradient(ellipse at center,rgba(255,255,255,.3) 0%,transparent 70%);animation:lineClearFlash .3s ease forwards;pointer-events:none;z-index:50}@keyframes lineClearFlash{0%{opacity:1}to{opacity:0}}@media (max-width: 768px){#hud{top:10px;left:10px;gap:10px}#score-container,#level-container,#lines-container{padding:10px 15px;min-width:100px}.hud-label{font-size:10px}#score,#level,#lines{font-size:24px}#controls-help{display:none}.game-title{font-size:48px}.game-subtitle{font-size:16px}.menu-button{width:200px;padding:12px 20px;font-size:14px}}