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h1{color:red;margin-bottom:20px;font-size:36px;letter-spacing:3px}.game-over-message p{margin-bottom:30px;font-size:18px;color:#ccc}#restart-button{background:#06f;color:#fff;border:none;padding:12px 24px;font-size:16px;border-radius:5px;cursor:pointer;transition:background .3s;letter-spacing:1px;font-weight:700}#restart-button:hover{background:#05c}.pause-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background-color:#0009;display:flex;flex-direction:column;align-items:center;justify-content:center;z-index:2000;font-family:monospace;color:#fff}.pause-overlay .pause-title{color:#ffff64;font-size:32px;margin-bottom:10px;text-align:center}.pause-overlay .pause-subtitle{color:#c8c8c8;font-size:16px;margin-bottom:40px;text-align:center}.pause-overlay .pause-instructions{color:#ffff64;font-size:14px;margin-top:40px;text-align:center}.reactor-countdown-overlay{position:fixed;top:80px;left:50%;transform:translate(-50%);width:auto;height:auto;background:#ff00001a;display:flex;justify-content:center;align-items:center;flex-direction:row;z-index:9999;animation:pulse 1s infinite;padding:20px;border-radius:10px}.reactor-countdown-overlay.hidden{display:none}.reactor-warning-text{font-family:Courier New,monospace;font-size:3rem;font-weight:700;color:red;text-shadow:0 0 20px #ff0000;margin-right:20px;animation:flicker .5s infinite}.reactor-countdown-number{font-family:Courier New,monospace;font-size:2.5rem;font-weight:700;color:#fff;text-shadow:0 0 30px #ff0000;border:3px solid #ff0000;padding:10px 20px;background:#000c;border-radius:10px}.reactor-countdown-number.critical{color:red;font-size:3rem}.reactor-countdown-number.warning{color:#f80;font-size:2.8rem}.reactor-countdown-number.normal{color:#fff;font-size:2.5rem}@keyframes 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