body{background-color:#1a1a1a;color:#e0e0e0;font-family:Arial,sans-serif;display:flex;flex-direction:column;align-items:center;margin:0;padding-top:20px;min-height:100vh}h1{color:#4caf50;margin-bottom:20px}#game-container{position:relative;border:3px solid #4CAF50;border-radius:10px;box-shadow:0 0 15px #4caf5080;background-color:#000;width:800px;height:600px;overflow:hidden}canvas{display:block;background-color:#0d0d0d;border-radius:7px}.overlay{position:absolute;top:0;left:0;width:100%;height:100%;background-color:#0a0a0ae6;display:flex;justify-content:center;align-items:center;text-align:center;border-radius:7px;color:#f0f0f0;z-index:20}.overlay-content{background-color:#252525;padding:30px 40px;border-radius:8px;border:1px solid #4CAF50;box-shadow:0 0 10px #00000080;max-width:80%}.overlay-content h2{color:#4caf50;margin-top:0;margin-bottom:15px}.overlay-content p{font-size:1.1em;line-height:1.6}button,.upgrade-button{padding:12px 25px;font-size:18px;font-weight:700;cursor:pointer;background-color:#4caf50;color:#fff;border:none;border-radius:5px;margin-top:20px;transition:background-color .3s ease,transform .1s ease;box-shadow:0 2px 5px #0000004d}button:hover,.upgrade-button:hover{background-color:#5cb85c}button:active,.upgrade-button:active{background-color:#45a049;transform:translateY(1px)}#hud{position:absolute;top:15px;left:15px;color:#fff;font-size:18px;font-weight:700;background-color:#0009;padding:8px 12px;border-radius:5px;border:1px solid #4CAF50;z-index:10}#hud div{margin-bottom:5px}#hud div:last-child{margin-bottom:0}#xpBarContainer{width:150px;height:10px;background-color:#555;border:1px solid #333;border-radius:3px;overflow:hidden}#xpBar{width:0%;height:100%;background-color:#76c7c0;transition:width .2s ease-out}#levelUpScreen .overlay-content{padding:25px}#upgradeOptionsContainer{margin-top:15px;display:flex;flex-direction:column;gap:12px;align-items:stretch}.upgrade-button{padding:12px 15px;font-size:15px;text-align:left;background-color:#3a3a3a;border:1px solid #555;margin-top:0;width:100%;box-sizing:border-box}.upgrade-button:hover{background-color:#4caf50;border-color:#6fbf73;color:#fff}.upgrade-button h4{margin:0 0 5px;color:#76c7c0;font-size:1.1em}.upgrade-button p{margin:0;font-size:.9em;line-height:1.3;color:#ccc}.footer-version{text-align:center;font-size:.95em;color:#aaa;margin-top:30px;margin-bottom:10px;letter-spacing:.02em}.footer-version a{color:#4caf50;text-decoration:none;font-weight:700;transition:color .2s}.footer-version a:hover{color:#76c7c0;text-decoration:underline}@media (max-width: 850px){#game-container{width:95vw;height:71.25vw}canvas{width:100%;height:100%}h1{font-size:1.5em}.overlay-content{padding:20px;max-width:90%}button,.upgrade-button{padding:10px 20px;font-size:16px}#hud{font-size:14px;top:10px;left:10px}#xpBarContainer{width:100px}.upgrade-button{padding:10px 15px;font-size:14px}.upgrade-button h4{font-size:1em}.upgrade-button p{font-size:.85em}}