*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;-webkit-font-smoothing:antialiased}
body{font-family:'Inter',-apple-system,system-ui,sans-serif;background:#050A05;color:#E2E8F0;min-height:100vh;overflow:hidden}
#app{width:100vw;height:100vh;position:relative}
.screen{position:absolute;inset:0;display:none;flex-direction:column;align-items:center;justify-content:center;padding:20px}
.screen.active{display:flex}

.title{font-size:2rem;font-weight:700;text-align:center;background:linear-gradient(135deg,#00FF41,#39FF14);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:4px;font-family:'JetBrains Mono',monospace}
.subtitle{font-size:.85rem;color:#39FF14aa;margin-bottom:20px;font-family:'JetBrains Mono',monospace}

.mode-options{display:flex;flex-direction:column;gap:10px;width:240px}
.btn-mode{padding:12px 24px;border:1px solid rgba(0,255,65,0.2);border-radius:8px;background:rgba(0,255,65,0.06);color:#00FF41;font-family:'JetBrains Mono',monospace;font-size:.9rem;font-weight:700;cursor:pointer;transition:all .25s ease}
.btn-mode:hover{background:rgba(0,255,65,0.15);border-color:rgba(0,255,65,0.4);transform:translateY(-2px);box-shadow:0 0 20px rgba(0,255,65,0.15)}
.btn-mode.secondary{color:#64748B;border-color:rgba(100,116,139,0.2);background:transparent}
.hs-mini{margin-top:16px;font-size:.72rem;color:#39FF14aa;font-family:'JetBrains Mono',monospace}

/* HUD */
.hud{display:flex;gap:24px;padding:10px 16px;justify-content:center;align-items:center}
.hud-item{display:flex;flex-direction:column;align-items:center;gap:2px}
.hud-label{font-size:.6rem;text-transform:uppercase;color:#39FF1488;letter-spacing:.06em;font-family:'JetBrains Mono',monospace}
.hud-value{font-family:'JetBrains Mono',monospace;font-weight:700;font-size:1.1rem;color:#00FF41}
.hud-value.combo{color:#F59E0B}
.hud-value.timer{color:#06B6D4}

/* Challenge */
.challenge-area{text-align:center;margin:16px 0}
.challenge-label{font-size:.7rem;text-transform:uppercase;color:#39FF1488;letter-spacing:.1em;font-family:'JetBrains Mono',monospace;margin-bottom:6px}
.challenge-value{font-family:'JetBrains Mono',monospace;font-size:2.4rem;font-weight:700;color:#00FF41;text-shadow:0 0 20px rgba(0,255,65,0.3);letter-spacing:.15em;margin-bottom:12px}

/* Bit display */
.bit-display{display:flex;gap:6px;justify-content:center;flex-wrap:wrap;margin-bottom:8px}
.bit{width:36px;height:36px;border:1px solid rgba(0,255,65,0.2);border-radius:4px;display:flex;align-items:center;justify-content:center;font-family:'JetBrains Mono',monospace;font-weight:700;font-size:1rem;background:rgba(0,255,65,0.04);color:#00FF41;transition:all .2s ease}
.bit.on{background:rgba(0,255,65,0.2);color:#00FF41;text-shadow:0 0 8px rgba(0,255,65,0.5);box-shadow:0 0 8px rgba(0,255,65,0.15)}
.bit.off{color:#39FF1444}
.bit-label{font-size:.5rem;color:#39FF1466;font-family:'JetBrains Mono',monospace;margin-top:2px;text-align:center;width:36px}

/* Input */
.input-area{display:flex;gap:8px;margin:12px 0}
.answer-input{padding:10px 16px;background:rgba(0,255,65,0.04);border:1px solid rgba(0,255,65,0.2);border-radius:8px;color:#00FF41;font-family:'JetBrains Mono',monospace;font-size:1.1rem;font-weight:700;width:200px;text-align:center;outline:none;transition:border-color .25s ease}
.answer-input:focus{border-color:#00FF41;box-shadow:0 0 12px rgba(0,255,65,0.15)}
.btn-submit{padding:10px 18px;border:1px solid rgba(0,255,65,0.3);border-radius:8px;background:rgba(0,255,65,0.1);color:#00FF41;font-size:1.1rem;cursor:pointer;transition:all .2s ease}
.btn-submit:hover{background:rgba(0,255,65,0.2)}

/* Power-ups */
.power-ups{display:flex;gap:8px;margin:8px 0}
.pu-btn{padding:6px 12px;border:1px solid rgba(245,158,11,0.2);border-radius:6px;background:rgba(245,158,11,0.06);color:#F59E0B;font-family:'JetBrains Mono',monospace;font-size:.72rem;cursor:pointer;transition:all .2s ease}
.pu-btn:hover{background:rgba(245,158,11,0.15)}
.pu-btn:disabled{opacity:0.3;cursor:not-allowed}

/* Feedback */
.feedback{font-family:'JetBrains Mono',monospace;font-size:1rem;font-weight:700;height:32px;line-height:32px;margin-top:8px}
.feedback.correct{color:#00FF41;text-shadow:0 0 10px rgba(0,255,65,0.4)}
.feedback.wrong{color:#EF4444}

/* Game Over */
.over-title{font-size:1.6rem;color:#00FF41;font-family:'JetBrains Mono',monospace;margin-bottom:8px}
.final-score{font-family:'JetBrains Mono',monospace;font-size:2.2rem;font-weight:700;color:#00FF41;text-shadow:0 0 20px rgba(0,255,65,0.3);margin-bottom:4px}
.final-stats{font-size:.78rem;color:#39FF1488;margin-bottom:20px;font-family:'JetBrains Mono',monospace}
.hs-title{color:#F59E0B;font-size:.85rem;margin:20px 0 8px;font-family:'JetBrains Mono',monospace}
.hs-list{font-family:'JetBrains Mono',monospace;font-size:.72rem;color:#39FF1488;line-height:1.8}

/* Float */
.float-score{position:fixed;font-family:'JetBrains Mono',monospace;font-weight:700;font-size:1.1rem;pointer-events:none;z-index:100;animation:floatUp .8s ease-out forwards}
@keyframes floatUp{0%{opacity:1;transform:translateY(0)}100%{opacity:0;transform:translateY(-60px)}}

@media(max-width:640px){.title{font-size:1.4rem}.challenge-value{font-size:1.6rem}.bit{width:28px;height:28px;font-size:.8rem}}