*{margin:0;padding:0;box-sizing:border-box}body{font-family:Orbitron,Segoe UI,Tahoma,Geneva,Verdana,sans-serif;overflow:hidden;background:linear-gradient(135deg,#0a0a1a,#1a0a2e,#0a1a2e);height:100vh;width:100vw}#game-container{width:100%;height:100%;position:relative;background:#050510;z-index:1}canvas{display:block;width:100%;height:100%;position:absolute;top:0;left:0;z-index:1}#ui-overlay{position:absolute;top:0;left:0;width:100%;height:100%;pointer-events:none;z-index:100}#ui-overlay>*{pointer-events:auto}#center-top-display{position:absolute;top:20px;left:50%;transform:translate(-50%);background:#0a0a1ab3;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);padding:15px 30px;border-radius:15px;border:1px solid rgba(0,255,255,.3);box-shadow:0 0 30px #0ff3,inset 0 0 20px #00ffff1a;z-index:101;display:flex;gap:30px;align-items:center;flex-wrap:wrap;justify-content:center}.center-score-item{display:flex;gap:15px;align-items:center}.center-score-item 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#ffffff1a;text-transform:uppercase;letter-spacing:2px;position:relative;overflow:hidden}.game-button:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.3),transparent);transition:left .5s}.game-button:hover:before{left:100%}.game-button:hover{transform:translateY(-3px) scale(1.05);box-shadow:0 0 50px #0ffc,0 8px 30px #00000080,inset 0 0 30px #fff3;background:linear-gradient(135deg,#f0f,#0ff)}.game-button:active{transform:translateY(-1px) scale(1.02)}#final-score{margin:20px 0}#final-score-value{font-size:42px;font-weight:900;background:linear-gradient(135deg,#0ff,#f0f);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;text-shadow:0 0 30px rgba(0,255,255,.8);letter-spacing:2px}.game-over-reason{font-size:24px;font-weight:600;margin:15px 0;color:#fa0;text-shadow:0 0 20px 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#f00c}}.car-upgrade-toast{position:absolute;top:120px;left:50%;transform:translate(-50%);background:#0a0a1af2;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);padding:20px 35px;border-radius:15px;border:2px solid rgba(0,255,255,.6);box-shadow:0 0 30px #00ffff80,0 0 60px #ff00ff4d,inset 0 0 20px #00ffff1a;z-index:250;pointer-events:none;display:flex;align-items:center;gap:15px;min-width:250px;justify-content:center}.car-upgrade-icon{font-size:32px;animation:carUpgradePulse 1s ease-in-out infinite;flex-shrink:0}.car-upgrade-content{display:flex;flex-direction:column;gap:5px}.car-upgrade-text{font-size:18px;font-weight:900;background:linear-gradient(135deg,#0ff,#f0f);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;text-shadow:0 0 20px rgba(0,255,255,.6);letter-spacing:1px}.car-upgrade-level{font-size:14px;font-weight:700;color:#0ff;text-shadow:0 0 15px rgba(0,255,255,.5);letter-spacing:.5px}@keyframes carUpgradePulse{0%,to{transform:scale(1)}50%{transform:scale(1.2) rotate(5deg)}}