:root{--bg-primary: #131317;--bg-secondary: #1a1a20;--bg-card: rgba(26, 26, 32, .8);--bg-card-hover: rgba(35, 35, 44, .8);--bg-glass: rgba(255, 255, 255, .04);--border-glass: rgba(255, 255, 255, .08);--text-primary: #d8d8dc;--text-secondary: #8a8a94;--text-muted: #55555e;--accent-cyan: #7a9ec2;--accent-cyan-dim: rgba(122, 158, 194, .15);--accent-magenta: #7a9ec2;--accent-magenta-dim: rgba(122, 158, 194, .15);--accent-green: #5cb85c;--accent-green-dim: rgba(92, 184, 92, .15);--accent-red: #c9534f;--accent-red-dim: rgba(201, 83, 79, .15);--accent-yellow: #c9a55a;--gap-xs: 4px;--gap-sm: 8px;--gap-md: 16px;--gap-lg: 24px;--gap-xl: 32px;--radius-sm: 6px;--radius-md: 12px;--radius-lg: 20px;--radius-full: 9999px;--shadow-glow-cyan: 0 0 12px rgba(122, 158, 194, .2);--shadow-glow-magenta: 0 0 12px rgba(122, 158, 194, .2);--shadow-glow-green: 0 0 16px rgba(92, 184, 92, .25);--shadow-glow-red: 0 0 16px rgba(201, 83, 79, .25);--transition-fast: .15s ease;--transition-normal: .3s ease;--transition-slow: .5s ease}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:Inter,system-ui,-apple-system,sans-serif;background:var(--bg-primary);color:var(--text-primary);min-height:100vh;overflow-x:hidden}#app{max-width:900px;margin:0 auto;padding:0 var(--gap-md)}.hidden{display:none!important}.app-header{padding:var(--gap-lg) 0 var(--gap-md)}.header-content{display:flex;align-items:center;justify-content:space-between;gap:var(--gap-md)}.logo{display:flex;align-items:center;gap:var(--gap-sm);font-size:1.3rem;font-weight:700;letter-spacing:-.02em}.logo-icon{font-size:1.5rem}.logo-text{color:var(--accent-cyan)}.logo-badge{font-size:.55rem;font-weight:700;letter-spacing:.1em;padding:2px 8px;border-radius:var(--radius-full);background:var(--accent-magenta-dim);color:var(--accent-magenta);border:1px solid rgba(255,0,229,.3)}.score-display{display:flex;align-items:center;gap:var(--gap-sm);padding:var(--gap-sm) var(--gap-md);border-radius:var(--radius-md);background:var(--bg-glass);border:1px solid var(--border-glass);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.score-label{font-size:.65rem;font-weight:600;letter-spacing:.12em;color:var(--text-muted)}.score-value{font-family:JetBrains Mono,monospace;font-size:1rem;font-weight:500;color:var(--accent-cyan)}.score-percent{font-family:JetBrains Mono,monospace;font-size:.8rem;color:var(--text-secondary)}.drop-zone{display:flex;align-items:center;justify-content:center;min-height:400px;border:2px dashed var(--border-glass);border-radius:var(--radius-lg);background:var(--bg-glass);transition:all var(--transition-normal);cursor:pointer;margin-top:var(--gap-lg)}.drop-zone.drag-over{border-color:var(--accent-cyan);background:var(--accent-cyan-dim);box-shadow:var(--shadow-glow-cyan)}.drop-zone-content{text-align:center;padding:var(--gap-xl)}.drop-icon{margin-bottom:var(--gap-md);color:var(--text-muted)}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.drop-text{font-size:1.1rem;font-weight:500;color:var(--text-primary);margin-bottom:var(--gap-sm)}.drop-subtext{font-size:.85rem;color:var(--text-muted);margin-bottom:var(--gap-md)}.file-select-btn{display:inline-block;padding:10px 28px;border-radius:var(--radius-full);background:var(--accent-cyan);color:#0a0a1a;font-weight:600;font-size:.9rem;cursor:pointer;transition:all var(--transition-fast);border:none}.file-select-btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-glow-cyan)}.drop-hint{margin-top:var(--gap-md);font-size:.75rem;color:var(--text-muted)}.file-info{display:flex;align-items:center;gap:var(--gap-sm);padding:var(--gap-sm) var(--gap-md);border-radius:var(--radius-md);background:var(--bg-glass);border:1px solid var(--border-glass);margin-bottom:var(--gap-md)}.file-icon{font-size:1.1rem}.file-name{flex:1;font-size:.85rem;font-weight:500;color:var(--text-secondary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.change-file-btn{background:none;border:1px solid var(--border-glass);border-radius:var(--radius-sm);padding:4px 8px;color:var(--text-muted);cursor:pointer;transition:all var(--transition-fast)}.change-file-btn:hover{color:var(--accent-cyan);border-color:var(--accent-cyan)}.waveform-container{position:relative;height:120px;border-radius:var(--radius-md);background:var(--bg-secondary);border:1px solid var(--border-glass);overflow:hidden;cursor:pointer;margin-bottom:var(--gap-md)}#waveformCanvas{width:100%;height:100%;display:block}.playhead{position:absolute;top:0;left:0;width:2px;height:100%;background:var(--accent-cyan);box-shadow:0 0 8px var(--accent-cyan);pointer-events:none;transition:left .05s linear;z-index:2}.time-overlay{position:absolute;bottom:6px;left:10px;right:10px;display:flex;justify-content:space-between;font-family:JetBrains Mono,monospace;font-size:.7rem;color:var(--text-muted);pointer-events:none;z-index:3}.transport-controls{display:flex;align-items:center;justify-content:space-between;padding:var(--gap-sm) var(--gap-md);border-radius:var(--radius-md);background:var(--bg-glass);border:1px solid var(--border-glass);margin-bottom:var(--gap-lg)}.transport-buttons{display:flex;align-items:center;gap:var(--gap-sm)}.transport-btn{display:flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:var(--radius-sm);background:none;border:1px solid transparent;color:var(--text-secondary);cursor:pointer;transition:all var(--transition-fast)}.transport-btn:hover{color:var(--text-primary);background:#ffffff0d;border-color:var(--border-glass)}.transport-btn.play-btn{width:48px;height:48px;border-radius:50%;background:var(--accent-cyan);color:#0a0a1a;border:none}.transport-btn.play-btn:hover{transform:scale(1.05);box-shadow:var(--shadow-glow-cyan)}.volume-control{display:flex;align-items:center;gap:var(--gap-sm);color:var(--text-muted)}.volume-slider{width:100px;height:4px;-webkit-appearance:none;appearance:none;border-radius:2px;background:#ffffff1a;outline:none}.volume-slider::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:14px;height:14px;border-radius:50%;background:var(--accent-cyan);cursor:pointer;border:none}.volume-slider::-moz-range-thumb{width:14px;height:14px;border-radius:50%;background:var(--accent-cyan);cursor:pointer;border:none}.eq-section{padding:var(--gap-lg);border-radius:var(--radius-lg);background:var(--bg-card);border:1px solid var(--border-glass);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);margin-bottom:var(--gap-lg)}.eq-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--gap-md)}.eq-title{font-size:.8rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--text-secondary)}.eq-reset-btn{font-size:.7rem;font-weight:500;padding:4px 14px;border-radius:var(--radius-full);background:none;border:1px solid var(--border-glass);color:var(--text-muted);cursor:pointer;transition:all var(--transition-fast)}.eq-reset-btn:hover{border-color:var(--accent-cyan);color:var(--accent-cyan)}.eq-curve-container{width:100%;height:100px;border-radius:var(--radius-sm);background:#0000004d;margin-bottom:var(--gap-lg);overflow:hidden}#eqCurveCanvas{width:100%;height:100%;display:block}.eq-bands{display:flex;justify-content:space-around;gap:var(--gap-md)}.eq-band{display:flex;flex-direction:column;align-items:center;gap:var(--gap-xs);flex:1}.band-label{font-size:.65rem;font-weight:600;letter-spacing:.1em;color:var(--text-muted);text-transform:uppercase}.band-freq{font-family:JetBrains Mono,monospace;font-size:.7rem;font-weight:500;color:var(--accent-cyan)}.band-slider-container{width:40px;height:160px;display:flex;align-items:center;justify-content:center;position:relative}.eq-slider{-webkit-appearance:none;appearance:none;width:140px;height:6px;border-radius:3px;background:#ffffff1a;outline:none;transform:rotate(-90deg);transform-origin:center center}.eq-slider::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:20px;height:20px;border-radius:50%;background:var(--text-primary);border:3px solid var(--accent-cyan);cursor:pointer;box-shadow:0 0 10px #00e5ff4d;transition:box-shadow var(--transition-fast)}.eq-slider::-webkit-slider-thumb:hover{box-shadow:0 0 16px #00e5ff80}.eq-slider::-moz-range-thumb{width:20px;height:20px;border-radius:50%;background:var(--text-primary);border:3px solid var(--accent-cyan);cursor:pointer;box-shadow:0 0 10px #00e5ff4d}.band-value{font-family:JetBrains Mono,monospace;font-size:.7rem;color:var(--text-secondary);min-width:55px;text-align:center}.quiz-section{position:relative;padding:var(--gap-lg);border-radius:var(--radius-lg);background:var(--bg-card);border:1px solid var(--border-glass);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);margin-bottom:var(--gap-xl);text-align:center}.quiz-status{display:flex;align-items:center;justify-content:center;gap:var(--gap-md);margin-bottom:var(--gap-lg)}.quiz-round{font-size:.7rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--text-muted);padding:2px 10px;border-radius:var(--radius-full);background:var(--bg-glass);border:1px solid var(--border-glass)}.quiz-active-band{font-family:JetBrains Mono,monospace;font-size:.75rem;font-weight:600;padding:2px 12px;border-radius:var(--radius-full);background:var(--accent-cyan-dim);color:var(--accent-cyan);border:1px solid rgba(122,158,194,.3)}.quiz-prompt{font-size:1.2rem;font-weight:600}.eq-band.disabled{opacity:.25;pointer-events:none}.eq-band.active .band-freq{color:var(--accent-cyan);font-weight:600}.band-stats{padding:var(--gap-lg);border-radius:var(--radius-lg);background:var(--bg-card);border:1px solid var(--border-glass);margin-bottom:var(--gap-xl)}.band-stats-title{font-size:.75rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--text-secondary);margin-bottom:var(--gap-md)}.band-stats-grid{display:flex;flex-direction:column;gap:var(--gap-sm)}.band-stat-item{display:grid;grid-template-columns:60px 1fr 50px;align-items:center;gap:var(--gap-sm)}.band-stat-name{font-family:JetBrains Mono,monospace;font-size:.7rem;color:var(--text-secondary)}.band-stat-bar{height:6px;border-radius:3px;background:#ffffff0f;overflow:hidden}.band-stat-fill{height:100%;border-radius:3px;background:var(--accent-cyan);width:0%;transition:width var(--transition-normal)}.band-stat-value{font-family:JetBrains Mono,monospace;font-size:.7rem;color:var(--text-muted);text-align:right}.quiz-buttons{display:flex;justify-content:center;gap:var(--gap-lg)}.quiz-btn{display:flex;flex-direction:column;align-items:center;gap:var(--gap-xs);padding:var(--gap-md) var(--gap-xl);border-radius:var(--radius-md);border:2px solid transparent;cursor:pointer;transition:all var(--transition-normal);min-width:140px}.quiz-btn-yes{background:var(--accent-green-dim);border-color:#0f83;color:var(--accent-green)}.quiz-btn-yes:hover{border-color:var(--accent-green);box-shadow:var(--shadow-glow-green);transform:translateY(-2px)}.quiz-btn-no{background:var(--accent-red-dim);border-color:#f463;color:var(--accent-red)}.quiz-btn-no:hover{border-color:var(--accent-red);box-shadow:var(--shadow-glow-red);transform:translateY(-2px)}.quiz-btn-icon{font-size:2rem;font-weight:700;line-height:1}.quiz-btn-label{font-size:.75rem;font-weight:500}.quiz-btn:disabled{opacity:.4;cursor:default;transform:none!important;box-shadow:none!important}.quiz-result{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--gap-md);border-radius:var(--radius-lg);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);z-index:10;animation:fadeIn .3s ease}.quiz-result.correct{background:#00ff881a;border:2px solid rgba(0,255,136,.3)}.quiz-result.incorrect{background:#ff44661a;border:2px solid rgba(255,68,102,.3)}@keyframes fadeIn{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}.result-icon{font-size:3.5rem;animation:popIn .4s cubic-bezier(.175,.885,.32,1.275)}@keyframes popIn{0%{transform:scale(0)}to{transform:scale(1)}}.result-text{font-size:1.3rem;font-weight:700}.result-detail{font-size:.85rem;color:var(--text-secondary)}.next-btn{margin-top:var(--gap-sm);padding:10px 32px;border-radius:var(--radius-full);background:#ffffff1a;border:1px solid rgba(255,255,255,.2);color:var(--text-primary);font-weight:600;font-size:.85rem;cursor:pointer;transition:all var(--transition-fast)}.next-btn:hover{background:#ffffff26;transform:translateY(-1px)}@keyframes shake{0%,to{transform:translate(0)}20%,60%{transform:translate(-6px)}40%,80%{transform:translate(6px)}}.shake{animation:shake .5s ease}@media(max-width:640px){.header-content{flex-direction:column;align-items:flex-start}.eq-bands{gap:var(--gap-sm)}.band-slider-container{height:120px}.eq-slider{width:100px}.quiz-buttons{gap:var(--gap-md)}.quiz-btn{padding:var(--gap-md);min-width:110px}.transport-buttons{gap:var(--gap-xs)}.volume-slider{width:70px}}