:root{font-family:Noto Sans KR,Poppins,system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:dark;color:#ffffffde;background-color:#010e1f;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}html{overflow:hidden;width:100%;height:100%}body{margin:0;padding:0;min-width:320px;min-height:100vh;max-height:100vh;background-color:#010e1f;overflow:hidden;width:100%;height:100%;position:fixed}h1{font-size:3.2em;line-height:1.1}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}#root{background-color:#010e1f;min-height:100vh}.main-container{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;max-height:100vh;padding:2rem 2rem 6rem;gap:1rem;background-color:#010e1f;position:relative;overflow:hidden;width:100%;box-sizing:border-box}.top-bar{position:absolute;top:1rem;left:1rem;width:calc(100% - 2rem);display:flex;justify-content:flex-start;align-items:center;box-sizing:border-box;z-index:10;padding-right:60px}.logo-container{display:flex;justify-content:center;align-items:center;margin-top:4rem}.main-logo{max-width:267px;width:100%;height:auto;object-fit:contain;animation:fadeIn .3s ease-in,logoGlow 3s ease-in-out infinite;filter:drop-shadow(0 0 10px rgba(59,130,246,.8)) drop-shadow(0 0 20px rgba(59,130,246,.6)) drop-shadow(0 0 30px rgba(59,130,246,.4)) drop-shadow(0 0 40px rgba(59,130,246,.3)) drop-shadow(0 0 50px rgba(59,130,246,.2))}.main-logo.no-animation{animation:fadeIn .3s ease-in,logoGlow 3s ease-in-out infinite}@keyframes fadeIn{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}.game-title{font-family:Do Hyeon,Orbitron,sans-serif;font-size:2.5rem;font-weight:400;color:#fff;text-align:center;margin:0;text-shadow:0 0 10px rgba(59,130,246,.8),0 0 20px rgba(59,130,246,.6),0 0 30px rgba(59,130,246,.4),0 0 40px rgba(59,130,246,.3),0 0 50px rgba(59,130,246,.2),0 2px 5px rgba(0,0,0,.5);animation:fadeIn .3s ease-in 0s both,glow 3s ease-in-out infinite;letter-spacing:.05em;position:relative}@keyframes glow{0%,to{text-shadow:0 0 10px rgba(59,130,246,.8),0 0 20px rgba(59,130,246,.6),0 0 30px rgba(59,130,246,.4),0 0 40px rgba(59,130,246,.3),0 0 50px rgba(59,130,246,.2),0 2px 5px rgba(0,0,0,.5)}50%{text-shadow:0 0 15px rgba(59,130,246,1),0 0 25px rgba(59,130,246,.8),0 0 35px rgba(59,130,246,.6),0 0 45px rgba(59,130,246,.4),0 0 55px rgba(59,130,246,.3),0 0 65px rgba(59,130,246,.2),0 2px 5px rgba(0,0,0,.5)}}@keyframes logoGlow{0%,to{filter:drop-shadow(0 0 10px rgba(59,130,246,.8)) drop-shadow(0 0 20px rgba(59,130,246,.6)) drop-shadow(0 0 30px rgba(59,130,246,.4)) drop-shadow(0 0 40px rgba(59,130,246,.3)) drop-shadow(0 0 50px rgba(59,130,246,.2))}50%{filter:drop-shadow(0 0 15px rgba(59,130,246,.9)) drop-shadow(0 0 25px rgba(59,130,246,.7)) drop-shadow(0 0 35px rgba(59,130,246,.5)) drop-shadow(0 0 45px rgba(59,130,246,.35)) drop-shadow(0 0 55px rgba(59,130,246,.25)) drop-shadow(0 0 65px rgba(59,130,246,.15))}}.button-container{display:flex;flex-direction:column;gap:1.5rem;width:100%;max-width:300px;margin-bottom:8rem}.main-button{width:100%;padding:1rem 2rem;font-family:Noto Sans KR,Poppins,sans-serif;font-size:1.2rem;font-weight:700;border:2px solid transparent;border-radius:12px;cursor:pointer;transition:all .3s ease;color:#fff;text-transform:none;position:relative;overflow:hidden;letter-spacing:.02em}.main-button:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.2),transparent);transition:left 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KR,Poppins,sans-serif;font-size:.9rem;font-weight:400;color:#9ca3afcc;text-align:center;margin:0;letter-spacing:.05em;position:absolute;bottom:2rem;left:50%;transform:translate(-50%);z-index:1;width:100%}.speed-mode-container{display:flex!important;align-items:center;justify-content:center;gap:1rem;position:absolute;bottom:2rem;left:50%;transform:translate(-50%);z-index:100;width:100%;pointer-events:auto;visibility:visible;opacity:1}.speed-mode-text{font-family:Noto Sans KR,Poppins,sans-serif;font-size:.9rem;font-weight:400;color:#fff;letter-spacing:.05em;opacity:.9}.toggle-switch{position:relative;display:inline-block;width:50px;height:26px}.toggle-switch input{opacity:0;width:0;height:0}.toggle-slider{position:absolute;cursor:pointer;inset:0;background-color:#ffffff4d;transition:.3s;border-radius:26px}.toggle-slider:before{position:absolute;content:"";height:20px;width:20px;left:3px;bottom:3px;background-color:#fff;transition:.3s;border-radius:50%}.toggle-switch input:checked+.toggle-slider{background-color:#3b82f6}.toggle-switch input:checked+.toggle-slider:before{transform:translate(24px)}.toggle-switch input:focus+.toggle-slider{box-shadow:0 0 1px #3b82f6}.back-button{font-family:Noto Sans KR,Poppins,sans-serif;font-size:1.2rem;font-weight:500;padding:.4rem .8rem;background:transparent;border:none;color:#ffffffe6;cursor:pointer;transition:all .2s ease;line-height:1}.back-button:hover{color:#fff;transform:translate(-2px)}.back-button:active{transform:translate(0)}.easy-button{background:linear-gradient(135deg,#eab308,#facc15);box-shadow:0 4px 15px #facc154d;border-color:#facc1580}.easy-button:hover{background:linear-gradient(135deg,#facc15,#fde047);transform:translateY(-2px);box-shadow:0 6px 20px #facc1580;border-color:#fde047cc}.medium-button{background:linear-gradient(135deg,#ea580c,#fb923c);box-shadow:0 4px 15px 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.hearts-container{position:absolute;left:50%;transform:translate(-50%)}.hearts-container{display:flex;gap:.5rem;align-items:center}.heart-icon{font-size:1.5rem;line-height:1}.combo-display{z-index:10}.score-display{display:flex;flex-direction:column;align-items:flex-end;gap:.25rem;margin-right:-40px}.score-label{font-family:Noto Sans KR,Poppins,sans-serif;font-size:.75rem;font-weight:500;color:#ffffffb3;text-transform:lowercase;letter-spacing:.05em}.score-value{font-family:Noto Sans KR,Poppins,sans-serif;font-size:1.5rem;font-weight:700;color:#fff;line-height:1}.question-box{background:linear-gradient(135deg,#3b82f640,#9333ea40);border:2px solid rgba(59,130,246,.4);border-radius:16px;padding:2rem;text-align:center;min-height:120px;display:flex;flex-direction:column;align-items:center;justify-content:center;margin-top:4rem;box-shadow:0 4px 20px #3b82f64d;position:relative}.question-number{position:absolute;top:1rem;left:1.5rem;font-family:Noto Sans KR,Poppins,sans-serif;font-size:.9rem;font-weight:600;color:#fffc;letter-spacing:.05em}.question-text{font-family:Noto Sans KR,Poppins,sans-serif;font-size:1.5rem;font-weight:600;color:#fff;margin:0}.timer-box{width:100%;padding:.25rem 0;display:flex;align-items:center;justify-content:center;position:relative}.timer-segments{width:100%;max-width:600px;display:flex;gap:.25rem;height:12px;margin:0 auto}.timer-segment{flex:1;height:100%;border-radius:3px;transition:opacity .3s ease,background-color .3s ease}.timer-segment.active{background:linear-gradient(90deg,#3b82f6,#60a5fa);opacity:1}.timer-segment.inactive{background-color:#ffffff1a;opacity:.3}.timer-value{font-family:Noto Sans KR,Poppins,sans-serif;font-size:1rem;font-weight:600;color:#fff;min-width:3rem;text-align:right}.answer-buttons{display:grid;grid-template-columns:1fr 1fr;gap:1rem;width:100%;max-width:600px;margin:0 auto}.answer-button{font-family:Noto Sans KR,Poppins,sans-serif;font-size:1.1rem;font-weight:600;padding:1.5rem 1rem;background:linear-gradient(135deg,#3b82f633,#9333ea33);border:2px solid rgba(59,130,246,.4);border-radius:12px;color:#fff;cursor:pointer;transition:all .3s ease;min-height:60px;box-shadow:0 2px 10px #3b82f626}.answer-button:hover{background:linear-gradient(135deg,#3b82f64d,#9333ea4d);border-color:#3b82f699;transform:translateY(-2px);box-shadow:0 4px 15px #3b82f640}.answer-button:active{transform:translateY(0);box-shadow:0 2px 8px #3b82f633}.answer-button:disabled{cursor:not-allowed;opacity:.7}.answer-button.correct-answer{background:linear-gradient(135deg,#10b98166,#05966966);border-color:#10b981cc;box-shadow:0 4px 15px #10b98166}.answer-button.wrong-answer{background:linear-gradient(135deg,#ef444466,#dc262666);border-color:#ef4444cc;box-shadow:0 4px 15px #ef444466}.feedback-message{position:absolute;bottom:.5rem;left:50%;transform:translate(-50%);font-family:Noto Sans KR,Poppins,sans-serif;font-size:1rem;font-weight:700;text-align:center;padding:.5rem 2.5rem;border-radius:12px;animation:fadeInScale .3s ease-out;z-index:100;white-space:nowrap;pointer-events:none}@keyframes fadeInScale{0%{opacity:0;transform:translate(-50%) scale(.8)}to{opacity:1;transform:translate(-50%) scale(1)}}.feedback-message.correct{color:#10b981;background:#10b98133;border:2px solid rgba(16,185,129,.5)}.feedback-message.incorrect{color:#ef4444;background:#ef444433;border:2px solid rgba(239,68,68,.5)}.game-over-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#000c;display:flex;align-items:center;justify-content:center;z-index:1000;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.game-over-modal{background:linear-gradient(135deg,#3b82f640,#9333ea40);border:2px solid rgba(59,130,246,.4);border-radius:20px;padding:2rem 1rem;max-width:350px;width:90%;text-align:center;box-shadow:0 10px 40px #3b82f64d;animation:fadeIn .3s ease-in;box-sizing:border-box}.game-over-title{font-family:Do Hyeon,Orbitron,sans-serif;font-size:2.5rem;font-weight:700;color:#fff;margin:0 0 1rem;text-shadow:0 0 20px rgba(255,255,255,.5)}.game-over-score{margin-bottom:2.5rem}.final-score-label{font-family:Noto Sans KR,Poppins,sans-serif;font-size:1rem;font-weight:500;color:#fffc;margin-bottom:1rem}.final-score-value{font-family:Noto Sans KR,Poppins,sans-serif;font-size:3rem;font-weight:700;color:#fff;line-height:1}.new-record-badge{font-family:Noto Sans KR,Poppins,sans-serif;font-size:1.2rem;font-weight:700;color:gold;margin-top:.5rem;text-shadow:0 0 10px rgba(255,215,0,.8);animation:pulse 1s ease-in-out infinite}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.1)}}.game-over-buttons{display:flex;flex-direction:row;gap:1rem;justify-content:center}.game-over-button{flex:1;min-width:0;white-space:nowrap;font-size:.95rem;padding:.85rem .75rem;text-align:center;display:flex;align-items:center;justify-content:center}.high-score-display{display:flex;flex-direction:column;align-items:center;gap:.5rem;margin:2rem 0}.high-score-value{font-family:Do Hyeon,Orbitron,sans-serif;font-size:4rem;font-weight:700;color:gold;text-shadow:0 0 10px rgba(255,215,0,.8),0 0 20px rgba(255,215,0,.6),0 0 30px rgba(255,215,0,.4);line-height:1}.high-score-label{font-family:Noto Sans KR,Poppins,sans-serif;font-size:1.2rem;font-weight:500;color:#fffc}.help-header{display:flex;flex-direction:column;align-items:center;gap:1rem;width:100%;margin-top:7rem;margin-bottom:.2rem}.help-container{display:flex;flex-direction:column;align-items:center;justify-content:flex-start;width:100%;max-width:500px;padding:1rem 1rem 10rem;gap:1.5rem}.help-title{font-family:Do Hyeon,Orbitron,sans-serif;font-size:2.5rem;font-weight:400;color:#fff;text-align:center;margin:0;text-shadow:0 0 10px rgba(59,130,246,.8),0 0 20px rgba(59,130,246,.6),0 0 30px rgba(59,130,246,.4)}.help-page-indicator{font-family:Noto Sans KR,Poppins,sans-serif;font-size:1rem;font-weight:500;color:#ffffffb3;padding:.5rem 1rem;background:#3b82f633;border:1px solid rgba(59,130,246,.4);border-radius:20px}.help-content{display:flex;align-items:center;justify-content:center;gap:.75rem;width:100%;min-height:300px}.help-nav-button{width:0;height:0;border:none;background:transparent;cursor:pointer;transition:all .3s ease;flex-shrink:0;padding:0}.help-nav-prev{border-right:20px solid rgba(59,130,246,.6);border-top:15px solid transparent;border-bottom:15px solid transparent}.help-nav-prev:hover{border-right-color:#3b82f6;transform:translate(-3px);filter:drop-shadow(0 0 8px rgba(59,130,246,.6))}.help-nav-next{border-left:20px solid rgba(59,130,246,.6);border-top:15px solid transparent;border-bottom:15px solid transparent}.help-nav-next:hover{border-left-color:#3b82f6;transform:translate(3px);filter:drop-shadow(0 0 8px rgba(59,130,246,.6))}.help-nav-button:active{transform:translate(0)}.help-page{width:220px;max-width:300px;min-width:220px;background:linear-gradient(135deg,#3b82f640,#9333ea40);border:2px solid rgba(59,130,246,.4);border-radius:16px;padding:1.5rem;text-align:center;box-shadow:0 4px 20px #3b82f64d;display:flex;flex-direction:column;justify-content:flex-start;gap:1rem;min-height:300px}.help-page-title{font-family:Do Hyeon,Orbitron,sans-serif;font-size:1.5rem;font-weight:600;color:#fff;margin:0;text-shadow:0 0 10px rgba(59,130,246,.6)}.help-page-content{font-family:Noto Sans KR,Poppins,sans-serif;font-size:.95rem;font-weight:400;color:#ffffffe6;line-height:1.6;margin:0;white-space:pre-line}.help-dots{display:flex;gap:.75rem;justify-content:center;align-items:center}.help-dot{width:12px;height:12px;border-radius:50%;border:2px solid rgba(255,255,255,.5);background:transparent;cursor:pointer;transition:all .3s ease;padding:0}.help-dot:hover{border-color:#fffc;transform:scale(1.2)}.help-dot.active{background:#3b82f6;border-color:#3b82f6;box-shadow:0 0 10px #3b82f699}.game-over-main-button{background:linear-gradient(135deg,#0891b2,#06b6d4);box-shadow:0 4px 15px #06b6d44d;border-color:#06b6d480}.game-over-main-button:hover{background:linear-gradient(135deg,#06b6d4,#22d3ee);transform:translateY(-2px);box-shadow:0 6px 20px #06b6d480;border-color:#22d3eecc}.game-over-retry-button{background:linear-gradient(135deg,#1e3a8a,#3b82f6);box-shadow:0 4px 15px #3b82f64d;border-color:#3b82f680}.game-over-retry-button:hover{background:linear-gradient(135deg,#3b82f6,#60a5fa);transform:translateY(-2px);box-shadow:0 6px 20px #3b82f680;border-color:#60a5facc}@media(max-width:768px){.main-container{gap:3rem;padding:1rem}.top-bar{top:1rem;left:1rem;max-width:calc(100% - 2rem)}.back-button{font-size:.9rem;padding:.6rem 1.2rem}.main-logo{max-width:200px}.game-title{font-size:1.8rem}.button-container{max-width:280px}.main-button{font-size:1.1rem;padding:.9rem 1.8rem}.game-container{padding:1rem;gap:1.5rem}.question-box{padding:1.5rem;min-height:100px}.question-text{font-size:1.2rem}.answer-buttons{grid-template-columns:1fr;gap:.75rem}.answer-button{font-size:1rem;padding:1.2rem 1rem;min-height:50px}.heart-icon{font-size:1.2rem}.score-label{font-size:.7rem}.score-value{font-size:1.2rem}.button-container{margin-bottom:6rem}.speed-mode-container{bottom:1.5rem;padding:0 1rem}.speed-mode-text{font-size:.85rem}.toggle-switch{width:45px;height:24px}.toggle-slider:before{height:18px;width:18px;left:3px;bottom:3px}.toggle-switch input:checked+.toggle-slider:before{transform:translate(21px)}}