*{margin:0;padding:0;box-sizing:border-box}body{font-family:Arial,sans-serif;background-color:#121212;color:#fff;overflow:hidden}.game-container{position:relative;width:100vw;height:100vh;display:flex;justify-content:center;align-items:center}#game-ui{position:absolute;top:0;left:0;width:100%;z-index:2;pointer-events:none}#game-canvas{position:absolute;top:0;left:0;width:100%;height:100%;z-index:1;will-change:transform;cursor:default}.clickable{cursor:pointer!important}#score-container,#lives-container,#time-container,#streak-container{position:absolute;z-index:2;padding:10px 15px;background-color:#000c;color:#fff;border-radius:5px;font-size:1.2em;box-shadow:0 2px 4px #0000004d;text-shadow:1px 1px 1px rgba(0,0,0,.7);border:1px solid rgba(255,255,255,.1)}#score-container:before{content:"Score: "}#time-container:before{content:"Time: "}#streak-container:before{content:"Streak: "}#score-container{top:10px;left:10px}#lives-container{top:10px;right:10px;display:flex;align-items:center;justify-content:center}#lives-hearts{display:flex;gap:5px}.heart-icon{width:25px;height:25px;background-image:url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%23e74c3c"><path d="M12 21.35l-1.45-1.32C5.4 15.36 2 12.28 2 8.5 2 5.42 4.42 3 7.5 3c1.74 0 3.41.81 4.5 2.09C13.09 3.81 14.76 3 16.5 3 19.58 3 22 5.42 22 8.5c0 3.78-3.4 6.86-8.55 11.54L12 21.35z"/></svg>');background-repeat:no-repeat;background-position:center;background-size:contain;transition:transform .3s ease,opacity .3s ease}.heart-icon.empty{background-image:url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%23555555"><path d="M12 21.35l-1.45-1.32C5.4 15.36 2 12.28 2 8.5 2 5.42 4.42 3 7.5 3c1.74 0 3.41.81 4.5 2.09C13.09 3.81 14.76 3 16.5 3 19.58 3 22 5.42 22 8.5c0 3.78-3.4 6.86-8.55 11.54L12 21.35z"/></svg>');opacity:.5}.heart-icon.damaged{transform:scale(1.2);animation:heart-pulse .5s ease}@keyframes heart-pulse{0%{transform:scale(1)}50%{transform:scale(1.3)}to{transform:scale(1)}}#time-container{top:10px;left:50%;transform:translate(-50%)}#streak-container{top:60px;right:10px;transition:all .3s ease}#streak-container.active{background-color:#f39c12e6;transform:scale(1.1);box-shadow:0 0 10px #f39c1280}#answer-modal{position:absolute;z-index:5;background-color:#ffffff80;border-radius:10px;padding:15px;width:250px;text-align:center;box-shadow:0 0 20px #000000b3,0 0 40px #00000080;border:3px solid #000;transform:none}#answer-modal:before{content:"";position:absolute;top:-15px;left:50%;transform:translate(-50%);border-width:0 15px 15px 15px;border-style:solid;border-color:transparent transparent #000 transparent;z-index:3}@keyframes shake{0%,to{transform:translate(0) rotate(0)}10%,90%{transform:translate(-4px,-4px) rotate(-1deg)}20%,80%{transform:translate(8px,8px) rotate(1deg)}30%,70%{transform:translate(-12px,-8px) rotate(-2deg)}40%,60%{transform:translate(12px,8px) rotate(2deg)}50%{transform:translate(-12px,-12px) rotate(-1deg)}}.shake{animation:shake .4s cubic-bezier(.25,.04,.45,.97) both}@keyframes earthHit{0%{filter:brightness(1)}30%{filter:brightness(1.8)}to{filter:brightness(1)}}.earth-hit{animation:earthHit .25s ease-out}.problem-display{font-size:1.6em;margin-bottom:15px;font-weight:700;color:#000;text-shadow:1px 1px 2px rgba(0,0,0,.2);font-family:Arial,sans-serif}.answer-options{display:grid;grid-template-columns:1fr 1fr;gap:10px}.answer-btn{padding:10px;font-size:1.2em;background-color:#000;color:#fff;border:2px solid #000;border-radius:8px;cursor:pointer;transition:all .2s ease;font-family:Arial,sans-serif;font-weight:700}.answer-btn:hover{background-color:#333;transform:scale(1.05);transition:all .2s ease}.hidden{display:none!important}#game-over,#start-screen{position:absolute;z-index:10;background-color:#000c;width:100%;height:100%;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:20px}#game-over{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);background-color:#000c;padding:2rem;border-radius:10px;text-align:center;color:#fff;z-index:10}#game-over h2{color:#ff4757;font-size:2.5rem;margin-bottom:1rem}#game-over p{margin-bottom:1rem;font-size:1.2rem}.new-high-score{color:gold;font-size:1.5rem!important;font-weight:700;margin:1rem 0;animation:pulse 1.5s infinite}@keyframes pulse{0%{transform:scale(1)}50%{transform:scale(1.1)}to{transform:scale(1)}}.welcome-image-container{margin:15px auto;max-width:600px;width:100%}.welcome-image{width:100%;height:auto;border-radius:10px;box-shadow:0 0 20px #3b82f680;margin-bottom:15px}#game-tip-container{margin:15px auto;padding:10px 15px;background-color:#34495eb3;border-radius:8px;border-left:4px solid #3498db;max-width:90%}.game-tip{font-size:1.1rem;color:#ecf0f1;font-style:italic;margin:0;line-height:1.4}.game-tip:before{content:"💡 Tip: ";font-weight:700;color:#f1c40f}#restart-btn,#start-btn{padding:12px 25px;font-size:1.2em;background-color:#2ecc71;color:#fff;border:none;border-radius:5px;cursor:pointer;margin-top:20px;transition:background-color .2s}#restart-btn:hover,#start-btn:hover{background-color:#27ae60}h1{font-size:2.5em;margin-bottom:15px;color:#3498db}h2{font-size:2em;margin-bottom:15px;color:#e74c3c}p{margin-bottom:15px;font-size:1.2em}p.version{font-size:.9em;color:#aaa;margin-top:10px;margin-bottom:20px}@media screen and (max-width: 768px){#score-container,#lives-container,#time-container,#streak-container{padding:5px 8px;font-size:.9em;background-color:#0009;border:none;box-shadow:none}#score-container{top:5px;left:5px}#lives-container{top:5px;right:5px}#time-container{top:5px;left:50%;transform:translate(-50%);font-size:.85em}#streak-container{top:40px;right:5px;font-size:.85em}.heart-icon{width:18px;height:18px}}@media screen and (max-width: 480px){#score-container,#lives-container,#time-container,#streak-container{padding:3px 6px;font-size:.8em;background-color:#00000080}#score-container{top:3px;left:3px;background-image:url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%23ffffff"><path d="M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm0 18c-4.41 0-8-3.59-8-8s3.59-8 8-8 8 3.59 8 8-3.59 8-8 8zm.31-8.86c-1.77-.45-2.34-.94-2.34-1.67 0-.84.79-1.43 2.1-1.43 1.38 0 1.9.66 1.94 1.64h1.71c-.05-1.34-.87-2.57-2.49-2.97V5H10.9v1.69c-1.51.32-2.72 1.3-2.72 2.81 0 1.79 1.49 2.69 3.66 3.21 1.95.46 2.34 1.15 2.34 1.87 0 .53-.39 1.39-2.1 1.39-1.6 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