:root{--bg-dark: #0a0b10;--panel-bg: rgba(20, 22, 37, .85);--neon-cyan: #00f0ff;--neon-pink: #ff007f;--neon-green: #39ff14;--neon-yellow: #fff01f;--text-light: #f0f4f8;--border-glow: 0 0 10px rgba(0, 240, 255, .3)}body{margin:0;font-family:Segoe UI,Roboto,Helvetica,Arial,sans-serif;background-color:var(--bg-dark);color:var(--text-light);overflow-x:hidden}.game-container{display:flex;flex-direction:column;min-height:100vh;background:radial-gradient(circle at center,#15182d,#080912);padding:20px;box-sizing:border-box;position:relative}.top-bar{display:flex;justify-content:space-between;align-items:center;padding-bottom:15px;border-bottom:1px solid rgba(255,255,255,.1);margin-bottom:20px}.logo-text{font-size:1.5rem;font-weight:800;background:linear-gradient(45deg,var(--neon-cyan),var(--neon-pink));-webkit-background-clip:text;-webkit-text-fill-color:transparent;display:flex;align-items:center;gap:8px}.badge{font-size:.75rem;background:var(--neon-pink);color:#fff;padding:2px 6px;border-radius:4px;-webkit-text-fill-color:#fff}.icon-btn{background:#ffffff1a;border:none;color:#fff;padding:8px;border-radius:50%;cursor:pointer;transition:all .2s}.icon-btn:hover{background:#fff3;transform:scale(1.1)}.screen{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;max-width:1200px;width:100%;margin:0 auto}.start-screen{text-align:center;position:relative}.hero-section{position:relative;margin-bottom:40px}.logo-container{margin-bottom:20px}.glowing-title{font-size:4rem;font-weight:900;text-transform:uppercase;letter-spacing:4px;color:#fff;text-shadow:0 0 10px var(--neon-cyan),0 0 30px var(--neon-cyan)}.sub-title{font-size:2.5rem;font-weight:800;color:var(--neon-pink);text-shadow:0 0 10px var(--neon-pink);margin-top:-10px}.description{font-size:1.1rem;max-width:600px;color:#a0aec0;line-height:1.6}.high-score-badge{background:#fff01f1a;border:1px solid var(--neon-yellow);padding:10px 20px;border-radius:30px;display:flex;align-items:center;gap:10px;font-size:1.1rem;margin-bottom:30px;box-shadow:0 0 15px #fff01f33}.gold-icon{color:var(--neon-yellow)}.highlight{color:var(--neon-yellow);font-size:1.3rem}.mode-selection{display:flex;gap:20px;margin-bottom:40px}.btn{display:flex;align-items:center;gap:10px;padding:15px 30px;font-size:1.2rem;font-weight:700;border:none;border-radius:12px;cursor:pointer;transition:all .2s}.btn-primary{background:linear-gradient(135deg,var(--neon-cyan),#0082ff);color:#000;box-shadow:0 0 20px #00f0ff66}.btn-primary:hover{transform:translateY(-3px);box-shadow:0 0 30px #00f0ff99}.btn-secondary{background:linear-gradient(135deg,var(--neon-pink),#b30059);color:#fff;box-shadow:0 0 20px #ff007f66}.btn-secondary:hover{transform:translateY(-3px);box-shadow:0 0 30px #ff007f99}.keyboard-tips{color:#718096;font-size:.9rem;background:#0000004d;padding:15px 30px;border-radius:10px;border:1px solid rgba(255,255,255,.05)}.keyboard-tips kbd{background:#2d3748;color:#fff;padding:2px 6px;border-radius:4px;font-size:.8rem;margin:0 2px;border-bottom:2px solid #1a202c}.space-tip{margin-top:10px;color:var(--neon-cyan);animation:pulse 1.5s infinite}.play-screen{width:100%}.level-header{display:flex;justify-content:space-between;align-items:center;width:100%;margin-bottom:15px}.level-badge{background:var(--neon-cyan);color:#000;font-weight:900;padding:6px 16px;border-radius:20px;box-shadow:0 0 10px var(--neon-cyan)}.question-counter{font-size:1.2rem;font-weight:700}.difficulty-indicator{font-weight:600}.timer-section{width:100%;margin-bottom:25px}.timer-bar-container{width:100%;height:10px;background:#ffffff1a;border-radius:5px;overflow:hidden;margin-bottom:8px}.timer-bar{height:100%;background:linear-gradient(90deg,var(--neon-green),var(--neon-cyan));transition:width .1s linear}.timer-bar.danger{background:var(--neon-pink);animation:flash .5s infinite alternate}.timer-text{text-align:right;font-size:.9rem;color:#a0aec0}.time-num{font-size:1.1rem;font-weight:800;color:#fff}.gameplay-layout{display:grid;gap:20px;width:100%}.single-layout{grid-template-columns:300px 1fr}.dual-layout{grid-template-columns:280px 1fr 280px}.player-panel{background:var(--panel-bg);border-radius:16px;padding:20px;border:1px solid rgba(255,255,255,.1);display:flex;flex-direction:column;gap:15px;position:relative;transition:all .3s}.p1-theme{border-left:5px solid var(--neon-pink)}.p2-theme{border-left:5px solid var(--neon-cyan)}.player-panel.eliminated{opacity:.4;filter:grayscale(100%)}.panel-header{display:flex;justify-content:space-between;align-items:center}.player-title{display:flex;align-items:center;gap:6px;font-weight:700}.lives-row{display:flex;gap:4px}.heart-icon.filled{color:var(--neon-pink);fill:var(--neon-pink);filter:drop-shadow(0 0 4px var(--neon-pink))}.heart-icon.empty{color:#4a5568}.score-box{background:#0003;padding:15px;border-radius:10px;text-align:center;display:flex;flex-direction:column}.score-box .label{font-size:.8rem;color:#718096}.score-box .score-value{font-size:2.2rem;font-weight:900;color:#fff}.stat-row{display:flex;justify-content:space-between;font-size:.95rem}.target-tip{color:var(--neon-green)}.btn-revive{background:#ff007f33;border:1px solid var(--neon-pink);color:#fff;padding:8px;border-radius:8px;cursor:pointer;font-size:.85rem;transition:all .2s}.btn-revive:hover{background:var(--neon-pink);color:#000}.key-guide{margin-top:auto;font-size:.8rem;color:#718096;display:flex;justify-content:space-between;align-items:center}.keys-row kbd{background:#1a202c;padding:2px 5px;border-radius:3px;margin-left:3px}.question-center-card{display:flex;flex-direction:column;gap:20px}.question-card{background:#0006;border:2px solid rgba(255,255,255,.1);border-radius:20px;padding:40px;text-align:center;box-shadow:inset 0 0 20px #0009}.question-text{font-size:2.6rem;font-weight:800;letter-spacing:2px;line-height:1.3}.options-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:15px}.option-btn{background:#ffffff0d;border:1px solid rgba(255,255,255,.1);border-radius:12px;padding:20px;cursor:pointer;position:relative;transition:all .2s;display:flex;justify-content:center;align-items:center}.option-btn:hover{background:#ffffff1a;border-color:var(--neon-cyan);transform:translateY(-2px)}.opt-val{font-size:1.8rem;font-weight:700;color:#fff}.opt-labels{position:absolute;bottom:8px;right:8px;display:flex;gap:4px}.p1-key-label{background:var(--neon-pink);color:#fff;font-size:.7rem;padding:1px 4px;border-radius:3px}.p2-key-label{background:var(--neon-cyan);color:#000;font-size:.7rem;padding:1px 4px;border-radius:3px}.p1-correct-highlight{border-color:var(--neon-green)!important;background:#39ff141a!important;box-shadow:0 0 15px #39ff144d}.p2-correct-highlight{border-color:var(--neon-cyan)!important;background:#00f0ff1a!important;box-shadow:0 0 15px #00f0ff4d}.feedback-row{display:flex;justify-content:center;gap:20px}.feedback-badge{padding:8px 16px;border-radius:8px;font-weight:700}.feedback-badge.correct{background:#39ff1433;color:var(--neon-green);border:1px solid var(--neon-green)}.feedback-badge.wrong{background:#ff007f33;color:var(--neon-pink);border:1px solid var(--neon-pink)}.transition-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#0a0b10f2;display:flex;justify-content:center;align-items:center;z-index:100}.transition-content{text-align:center;padding:40px;border-radius:20px;border:1px solid var(--neon-cyan);background:#0009;box-shadow:0 0 30px #00f0ff4d}.transition-content h2{font-size:2rem;margin:20px 0}.gameover-screen{text-align:center}.gameover-header{margin-bottom:30px}.glowing-title-red{font-size:4rem;font-weight:900;color:#fff;text-shadow:0 0 10px var(--neon-pink),0 0 30px var(--neon-pink)}.results-container{width:100%;max-width:600px;margin-bottom:40px}.result-card{background:var(--panel-bg);border-radius:16px;padding:30px;border:1px solid rgba(255,255,255,.1)}.result-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-top:20px}.result-item{display:flex;flex-direction:column;background:#0000004d;padding:15px;border-radius:10px}.result-item .val{font-size:2rem;font-weight:800}.new-record-tag{margin-top:20px;background:#fff01f1a;border:1px solid var(--neon-yellow);padding:10px;border-radius:8px;color:var(--neon-yellow);display:flex;align-items:center;justify-content:center;gap:8px}.dual-comparison{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-top:20px}.player-final{flex:1;padding:20px;border-radius:12px;background:#0000004d}.player-final.winner{border:2px solid var(--neon-green);box-shadow:0 0 15px #39ff1433}.vs-divider{font-size:1.5rem;font-weight:800;color:#718096}.action-buttons{display:flex;gap:20px}@keyframes pulse{0%{opacity:.6}50%{opacity:1}to{opacity:.6}}@keyframes flash{0%{opacity:1}to{opacity:.4}}@media (max-width: 768px){.single-layout,.dual-layout{grid-template-columns:1fr}.glowing-title{font-size:2.5rem}.sub-title{font-size:1.8rem}.question-text{font-size:2rem}.opt-val{font-size:1.3rem}}