:root{color-scheme:dark;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{min-height:100vh;background:#0a0a0a;color:#fafafa}.screen{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:2rem;max-width:480px;margin:0 auto}.btn{border:none;border-radius:.75rem;padding:1rem 2.5rem;font-size:1.1rem;font-weight:700;cursor:pointer;transition:transform .1s,box-shadow .1s;letter-spacing:.02em}.btn:active{transform:scale(.97)}.btn-primary{background:linear-gradient(135deg,#6366f1,#a855f7);color:#fff;box-shadow:0 4px 24px #6366f166}.btn-primary:hover{box-shadow:0 6px 32px #6366f199;transform:translateY(-1px)}.start-screen{text-align:center;gap:1.25rem}.logo-icon{font-size:4rem;margin-bottom:.5rem;animation:pulse 2s ease-in-out infinite}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.1)}}.start-screen h1{font-size:2.5rem;font-weight:800;letter-spacing:-.03em;background:linear-gradient(135deg,#6366f1,#a855f7,#ec4899);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.subtitle{color:#fff9;font-size:1rem;max-width:320px;line-height:1.6}.level-preview{display:flex;gap:.4rem;flex-wrap:wrap;justify-content:center;margin:.5rem 0}.level-badge{width:2rem;height:2rem;border-radius:.4rem;background:#ffffff0f;border:1px solid rgba(255,255,255,.1);display:flex;align-items:center;justify-content:center;font-size:.75rem;font-weight:700;color:#fff6}.instructions{display:flex;flex-direction:column;gap:.6rem;margin-top:.5rem}.instruction-row{display:flex;align-items:center;gap:.75rem;font-size:.9rem;color:#ffffff80}.instruction-icon{font-size:1.1rem;width:1.5rem;text-align:center}.gameover-screen{text-align:center;gap:1.5rem}.gameover-icon{font-size:4rem}.gameover-screen h1{font-size:2.2rem;font-weight:800;color:#f87171}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:.75rem;width:100%}.stat-card{background:#ffffff0a;border:1px solid rgba(255,255,255,.08);border-radius:.75rem;padding:1rem .5rem;text-align:center}.stat-value{font-size:1.6rem;font-weight:800;color:#a78bfa}.stat-label{font-size:.7rem;text-transform:uppercase;letter-spacing:.1em;color:#fff6;margin-top:.25rem}.accuracy-row{display:flex;align-items:center;gap:.75rem;font-size:1rem}.accuracy-label{color:#ffffff80}.accuracy-value{font-weight:800;color:#22c55e}.levelup-screen{text-align:center;gap:1rem;animation:fadeInUp .4s ease-out}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.levelup-icon{font-size:3.5rem}.levelup-screen h1{font-size:2rem;font-weight:800;background:linear-gradient(135deg,#fbbf24,#f59e0b);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.level-label{font-size:1.1rem;color:#fff9}.level-info{display:flex;flex-direction:column;gap:.5rem;background:#ffffff0a;border:1px solid rgba(255,255,255,.08);border-radius:.75rem;padding:1rem 1.25rem;width:100%}.info-item{display:flex;align-items:center;gap:.75rem;font-size:.95rem;color:#ffffffb3}.info-icon{font-size:1rem;width:1.5rem;text-align:center}.playing-screen{gap:1rem;padding-top:1.5rem;width:100%}.game-header{display:flex;justify-content:space-between;align-items:center;width:100%}.header-left{display:flex;align-items:center;gap:.6rem}.level-tag{background:#6366f126;color:#818cf8;font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.1em;padding:.25rem .5rem;border-radius:.3rem}.level-name{font-size:.85rem;color:#ffffff80}.header-right{text-align:right}.score-display{font-size:1.8rem;font-weight:800;background:linear-gradient(135deg,#fbbf24,#f59e0b);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1.1}.score-label{font-size:.65rem;text-transform:uppercase;letter-spacing:.1em;color:#ffffff4d}.progress-bar{width:100%;height:1.2rem;background:#ffffff0f;border-radius:.6rem;overflow:hidden;position:relative}.progress-fill{height:100%;background:linear-gradient(90deg,#6366f1,#a855f7);border-radius:.6rem;transition:width .4s ease-out}.progress-text{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;font-size:.65rem;font-weight:700;color:#fffc;text-shadow:0 1px 2px rgba(0,0,0,.5)}.timer-bar{width:100%;height:.35rem;background:#ffffff0f;border-radius:.2rem;overflow:hidden}.timer-fill{height:100%;background:#22c55e;border-radius:.2rem;transition:width 1s linear,background .3s}.timer-fill.timer-low{background:#fbbf24}.timer-fill.timer-critical{background:#ef4444;animation:timerPulse .5s ease-in-out infinite}@keyframes timerPulse{0%,to{opacity:1}50%{opacity:.6}}.timer-text{font-size:1.2rem;font-weight:700;text-align:center;font-variant-numeric:tabular-nums;color:#22c55e}.timer-text.timer-low{color:#fbbf24}.timer-text.timer-critical{color:#ef4444;animation:timerPulse .5s ease-in-out infinite}.problem-card{width:100%;background:#ffffff0a;border:2px solid rgba(255,255,255,.08);border-radius:1rem;padding:2rem 1.5rem;text-align:center;transition:border-color .3s,background .3s}.problem-card.correct{border-color:#22c55e;background:#22c55e14}.problem-card.wrong{border-color:#ef4444;background:#ef444414}.problem-text{font-size:2.5rem;font-weight:800;letter-spacing:-.02em;font-variant-numeric:tabular-nums}.problem-equals{font-size:1.5rem;color:#ffffff4d;margin:.25rem 0}.answer-input{background:#ffffff0f;border:2px solid rgba(255,255,255,.15);border-radius:.6rem;padding:.75rem 1rem;font-size:1.8rem;font-weight:700;color:#fafafa;text-align:center;width:100%;max-width:200px;outline:none;transition:border-color .2s;font-variant-numeric:tabular-nums;-moz-appearance:textfield}.answer-input::-webkit-inner-spin-button,.answer-input::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}.answer-input:focus{border-color:#6366f1}.answer-input.correct{border-color:#22c55e}.answer-input.wrong{border-color:#ef4444}.feedback-text{font-size:1rem;font-weight:700;margin-top:.75rem}.feedback-text.correct{color:#22c55e}.feedback-text.wrong{color:#ef4444}.stats-row{display:flex;justify-content:center;gap:2rem;width:100%}.mini-stat{display:flex;flex-direction:column;align-items:center;gap:.15rem}.mini-stat-value{font-size:1.2rem;font-weight:800;color:#a78bfa}.mini-stat-label{font-size:.6rem;text-transform:uppercase;letter-spacing:.1em;color:#ffffff59}@media(max-width:480px){.screen{padding:1.25rem}.start-screen h1,.problem-text{font-size:2rem}.answer-input{font-size:1.5rem}}