:root{--bg-primary: #050505;--bg-secondary: #0f0f10;--bg-tertiary: #18181b;--accent-primary: #6d28d9;--accent-glow: #8b5cf6;--accent-success: #10b981;--accent-error: #ef4444;--color-white: #ffffff;--color-blue: #3b82f6;--color-blue-light: #60a5fa;--color-blue-dark: #2563eb;--color-purple: #a855f7;--color-green: #22c55e;--color-green-light: #4ade80;--color-green-dark: #16a34a;--color-amber: #f59e0b;--color-amber-light: #fbbf24;--color-amber-dark: #d97706;--color-red-light: #f87171;--text-primary: #fafafa;--text-secondary: #a1a1aa;--text-tertiary: #71717a;--border-opacity-05: rgba(255, 255, 255, .05);--border-opacity-08: rgba(255, 255, 255, .08);--border-opacity-1: rgba(255, 255, 255, .1);--border-opacity-15: rgba(255, 255, 255, .15);--border-opacity-2: rgba(255, 255, 255, .2);--bg-opacity-03: rgba(255, 255, 255, .03);--bg-opacity-05: rgba(255, 255, 255, .05);--bg-opacity-1: rgba(255, 255, 255, .1);--bg-opacity-15: rgba(255, 255, 255, .15);--bg-tertiary-05: rgba(24, 24, 27, .5);--bg-tertiary-06: rgba(24, 24, 27, .6);--bg-tertiary-07: rgba(24, 24, 27, .7);--bg-black-02: rgba(0, 0, 0, .2);--bg-black-03: rgba(0, 0, 0, .3);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 24px;--radius-full: 9999px;--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 16px;--spacing-lg: 24px;--spacing-xl: 32px;--spacing-2xl: 64px;--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-normal: .3s cubic-bezier(.4, 0, .2, 1);--shadow-glow: 0 0 20px -5px rgba(139, 92, 246, .3)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;width:100%;overflow-x:hidden}body{background-color:var(--bg-primary);color:var(--text-primary);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji",Segoe UI Symbol;line-height:1.5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}button{cursor:pointer;font:inherit;border:none;background:none}.container{max-width:1200px;margin:0 auto;padding:0 var(--spacing-md);min-height:100vh;display:flex;flex-direction:column}.heading-xl{font-size:3rem;font-weight:700;letter-spacing:-.05em;line-height:1.1;background:linear-gradient(to right,var(--color-white),var(--text-secondary));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.heading-lg{font-size:2rem;font-weight:600;letter-spacing:-.03em}.text-muted{color:var(--text-secondary)}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.animate-fade-in{animation:fadeIn var(--transition-normal) forwards}@keyframes pulse-glow{0%,to{box-shadow:0 0 10px -5px var(--accent-glow);opacity:1}50%{box-shadow:0 0 25px -5px var(--accent-glow);opacity:.7}}.btn-primary{background:var(--accent-primary);color:var(--color-white);padding:var(--spacing-md) var(--spacing-xl);border-radius:var(--radius-full);font-weight:600;font-size:1.1rem;transition:all var(--transition-normal);box-shadow:0 4px 15px -3px #7c3aed4d}.btn-primary:hover{background:var(--accent-glow);transform:translateY(-2px);box-shadow:0 8px 25px -5px #7c3aed80}.btn-secondary{background:var(--bg-tertiary);color:var(--text-primary);padding:var(--spacing-sm) var(--spacing-lg);border-radius:var(--radius-full);font-weight:500;transition:background var(--transition-fast);border:1px solid var(--border-opacity-1)}.btn-secondary:hover{background:var(--bg-opacity-1)}.btn-stop{background:var(--accent-error);color:var(--color-white);padding:var(--spacing-sm) var(--spacing-xl);border-radius:var(--radius-full);font-weight:600}.card-glass{background:var(--bg-tertiary-06);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--border-opacity-05);border-radius:var(--radius-lg);padding:var(--spacing-lg);box-shadow:0 4px 30px #0000001a}.metric-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:var(--spacing-md);margin-top:var(--spacing-md)}.metric-item{background:var(--bg-secondary);border-radius:var(--radius-md);padding:var(--spacing-md);text-align:center;border:1px solid var(--border-opacity-05);transition:transform var(--transition-fast),border-color var(--transition-fast)}.metric-item:hover{transform:translateY(-2px);border-color:var(--border-opacity-1)}.metric-item.accent-blue{border-top:2px solid var(--color-blue);background:linear-gradient(180deg,#3b82f61a,#3b82f600)}.metric-item.accent-purple{border-top:2px solid var(--color-purple);background:linear-gradient(180deg,#a855f71a,#a855f700)}.metric-item.accent-green{border-top:2px solid var(--accent-success);background:linear-gradient(180deg,#10b9811a,#10b98100)}.metric-value{display:block;font-size:2rem;font-weight:800;color:var(--text-primary);margin-bottom:var(--spacing-xs)}.metric-label{font-size:.75rem;text-transform:uppercase;letter-spacing:.05em;color:var(--text-secondary);font-weight:600}.metric-footer{display:flex;justify-content:center;gap:var(--spacing-lg);margin-top:var(--spacing-lg);border-top:1px solid var(--border-opacity-05);padding-top:var(--spacing-md)}.metric-subitem{display:flex;flex-direction:column;align-items:center}.metric-subvalue{font-size:1.25rem;font-weight:700;color:var(--text-secondary)}.metric-sublabel{font-size:.7rem;text-transform:uppercase;letter-spacing:.05em;color:var(--text-tertiary)}.session-container{flex:1;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:var(--spacing-xl);text-align:center;min-height:50vh}.visualizer-circle{width:120px;height:120px;border-radius:50%;background:var(--accent-primary);display:flex;align-items:center;justify-content:center;animation:pulse-glow 2s infinite ease-in-out;position:relative}.visualizer-circle:after{content:"";position:absolute;top:-10px;left:-10px;right:-10px;bottom:-10px;border-radius:50%;border:2px solid var(--accent-primary);opacity:.5;animation:breathe 3s infinite ease-in-out}.status-badge{display:inline-flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);background:#7c3aed1a;color:var(--accent-glow);border-radius:var(--radius-full);font-size:.9rem;font-weight:600}.audio-level-bars{display:flex;align-items:flex-end;justify-content:center;gap:6px;height:80px;margin:var(--spacing-lg) 0}.audio-bar{width:12px;min-height:8px;background:linear-gradient(180deg,var(--accent-glow),var(--accent-primary));border-radius:var(--radius-sm);transition:height 80ms ease-out,opacity .15s ease;box-shadow:0 0 10px #8b5cf64d}.live-transcript{font-size:1.1rem;color:var(--text-secondary);min-height:3em;padding:var(--spacing-md);background:var(--bg-opacity-03);border-radius:var(--radius-md);margin:var(--spacing-md) 0;text-align:left;line-height:1.6}.live-transcript-cursor{display:inline-block;width:2px;height:1.2em;background:var(--accent-glow);margin-left:2px;vertical-align:text-bottom;animation:blink 1s infinite}@keyframes blink{0%,50%{opacity:1}51%,to{opacity:0}}.elapsed-timer{font-size:1.5rem;font-weight:600;color:var(--text-primary);font-variant-numeric:tabular-nums;margin-bottom:var(--spacing-sm)}.recording-panel{max-width:450px;width:100%;padding:var(--spacing-xl);background:var(--bg-tertiary-05);border:1px solid var(--border-opacity-05);border-radius:var(--radius-lg);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.device-picker{display:flex;flex-direction:column;gap:var(--spacing-xs);margin-bottom:var(--spacing-lg)}.device-picker-label{font-size:.75rem;text-transform:uppercase;letter-spacing:.05em;color:var(--text-secondary);font-weight:600}.device-picker-select{background:var(--bg-tertiary);color:var(--text-primary);border:1px solid var(--border-opacity-1);border-radius:var(--radius-md);padding:var(--spacing-sm) var(--spacing-md);font-size:.95rem;cursor:pointer;transition:border-color var(--transition-fast);width:100%}.device-picker-select:hover{border-color:var(--border-opacity-2)}.device-picker-select:focus{outline:none;border-color:var(--accent-primary);box-shadow:0 0 0 2px #6d28d933}.device-picker-select option{background:var(--bg-secondary);color:var(--text-primary)}.mic-level-meter{margin-bottom:var(--spacing-lg);padding:var(--spacing-md);background:var(--bg-opacity-03);border-radius:var(--radius-md);border:1px solid var(--border-opacity-05)}.mic-level-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-sm)}.mic-level-label{font-size:.75rem;text-transform:uppercase;letter-spacing:.05em;color:var(--text-secondary);font-weight:600}.mic-level-hint{margin-top:var(--spacing-sm);font-size:.75rem;color:var(--text-tertiary);text-align:center}.dashboard-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-xl);padding-bottom:var(--spacing-lg);border-bottom:1px solid var(--border-opacity-05)}.dashboard-layout{display:flex;flex-direction:column;gap:var(--spacing-lg)}.primary-metrics-grid{display:grid;grid-template-columns:repeat(1,1fr);gap:var(--spacing-md)}@media (min-width: 768px){.primary-metrics-grid{grid-template-columns:repeat(3,1fr)}}.secondary-metrics-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--spacing-md);background:var(--bg-opacity-03);border-radius:var(--radius-md);padding:var(--spacing-md);border:1px solid var(--border-opacity-05)}@media (min-width: 768px){.secondary-metrics-grid{grid-template-columns:repeat(4,1fr)}}.metric-card-premium{position:relative;overflow:hidden;background:var(--bg-opacity-03);border:1px solid var(--border-opacity-05);border-radius:var(--radius-md);padding:var(--spacing-lg) var(--spacing-md);display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;transition:transform var(--transition-fast)}.metric-card-premium:hover{transform:translateY(-2px);background:var(--bg-opacity-05)}.metric-card-premium:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;opacity:.1;z-index:0}.metric-card-premium.pronunciation:before{background:linear-gradient(135deg,var(--accent-success),transparent)}.metric-card-premium.clarity:before{background:linear-gradient(135deg,var(--color-amber),transparent)}.metric-card-premium.cefr:before{background:linear-gradient(135deg,var(--color-blue),transparent)}.metric-card-premium .value{font-size:2.5rem;font-weight:800;margin-bottom:var(--spacing-xs);position:relative;z-index:1}.metric-card-premium.pronunciation .value{color:var(--accent-success);background:linear-gradient(to bottom,var(--color-green-light),var(--color-green-dark));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.metric-card-premium.clarity .value{color:var(--color-amber);background:linear-gradient(to bottom,var(--color-amber-light),var(--color-amber-dark));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.metric-card-premium.cefr .value{color:var(--color-blue);background:linear-gradient(to bottom,var(--color-blue-light),var(--color-blue-dark));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.secondary-stat-item{text-align:center;padding:var(--spacing-xs);position:relative}.secondary-stat-item:not(:first-child):after{content:"";position:absolute;left:0;top:10%;bottom:10%;width:1px;background:var(--border-opacity-05);display:none}.details-grid{display:grid;grid-template-columns:1fr;gap:var(--spacing-lg);margin-top:var(--spacing-sm)}@media (min-width: 1024px){.details-grid{grid-template-columns:1fr 1fr}}.transcript-box{background:var(--bg-black-02);border:1px solid var(--border-opacity-05);border-radius:var(--radius-md);padding:var(--spacing-md)}.teacher-report{background:var(--bg-opacity-03);border:1px solid var(--border-opacity-08);border-radius:var(--radius-md);overflow:hidden;display:flex;flex-direction:column}.text-gradient-pronunciation{background:linear-gradient(to bottom,var(--color-green-light),var(--color-green-dark));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.av-card{background:var(--bg-tertiary-07);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border:1px solid var(--border-opacity-08);border-radius:var(--radius-lg);padding:var(--spacing-lg);margin-bottom:var(--spacing-lg);position:relative;overflow:hidden}.av-card:before{content:"";position:absolute;top:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,rgba(139,92,246,.5),transparent)}.av-header{display:flex;flex-direction:column;gap:var(--spacing-sm);margin-bottom:var(--spacing-md);padding-bottom:var(--spacing-md);border-bottom:1px solid var(--border-opacity-05)}@media (min-width: 400px){.av-header{flex-direction:row;justify-content:space-between;align-items:center}}.av-controls{display:flex;align-items:center;gap:var(--spacing-sm);flex-wrap:wrap;justify-content:center}.av-btn-play{width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,var(--accent-primary),var(--accent-glow));color:#fff;display:flex;align-items:center;justify-content:center;transition:all var(--transition-normal);box-shadow:0 4px 15px -3px #8b5cf666}.av-btn-play:hover{transform:scale(1.08);box-shadow:0 6px 20px -3px #8b5cf699}.av-btn-play:active{transform:scale(.95)}.av-btn-stop{width:36px;height:36px;border-radius:var(--radius-md);background:#ef444426;color:var(--color-red-light);display:flex;align-items:center;justify-content:center;transition:all var(--transition-fast);border:1px solid rgba(239,68,68,.2)}.av-btn-stop:hover{background:#ef444440;border-color:#ef444466}.av-btn-skip{width:36px;height:36px;border-radius:var(--radius-md);background:var(--bg-opacity-08);color:var(--text-secondary);display:flex;align-items:center;justify-content:center;transition:all var(--transition-fast);border:1px solid var(--border-opacity-1)}.av-btn-skip:hover{background:var(--bg-opacity-15);color:var(--text-primary);border-color:var(--border-opacity-2)}.av-speed-control{display:flex;gap:2px;background:var(--bg-opacity-05);border-radius:var(--radius-full);padding:3px}@media (min-width: 400px){.av-speed-control{margin-left:var(--spacing-sm)}}.av-speed-btn{padding:6px 12px;font-size:.75rem;font-weight:600;color:var(--text-secondary);border-radius:var(--radius-full);transition:all var(--transition-fast)}.av-speed-btn:hover{color:var(--text-primary);background:var(--bg-opacity-1)}.av-speed-btn.active{background:var(--accent-primary);color:#fff}.av-time{font-size:.9rem;font-weight:600;font-variant-numeric:tabular-nums;color:var(--text-secondary);background:var(--bg-opacity-05);padding:8px 14px;border-radius:var(--radius-md)}.av-stats-bar{display:flex;gap:var(--spacing-lg);padding:var(--spacing-md);background:var(--bg-opacity-03);border-radius:var(--radius-md);margin-bottom:var(--spacing-md);border:1px solid var(--border-opacity-05)}.av-stat{display:flex;align-items:center;gap:var(--spacing-sm)}.av-stat-icon{width:32px;height:32px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;font-size:.9rem}.av-stat-icon.green{background:#22c55e26;color:var(--color-green-light)}.av-stat-icon.amber{background:#f59e0b26;color:var(--color-amber-light)}.av-stat-icon.red{background:#ef444426;color:var(--color-red-light)}.av-stat-icon.blue{background:#3b82f626;color:var(--color-blue-light)}.av-stat-content{display:flex;flex-direction:column}.av-stat-value{font-size:1.1rem;font-weight:700;color:var(--text-primary);line-height:1}.av-stat-label{font-size:.65rem;text-transform:uppercase;letter-spacing:.05em;color:var(--text-tertiary);margin-top:2px}.av-confidence-gauge{width:48px;height:48px;position:relative}.av-confidence-gauge svg{transform:rotate(-90deg)}.av-confidence-gauge-bg{fill:none;stroke:#ffffff1a;stroke-width:4}.av-confidence-gauge-fill{fill:none;stroke-width:4;stroke-linecap:round;transition:stroke-dashoffset var(--transition-normal)}.av-confidence-gauge-text{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;font-size:.7rem;font-weight:700}.av-waveform{position:relative;min-height:128px;border-radius:var(--radius-md);background:var(--bg-black-02);overflow:hidden}.av-waveform:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;border-radius:var(--radius-md);box-shadow:inset 0 0 20px var(--bg-black-03)}.av-word-active{animation:wordGlow .3s ease-out forwards;z-index:10!important}@keyframes wordGlow{0%{box-shadow:0 0 #8b5cf600;transform:scaleY(1)}to{box-shadow:0 0 20px #8b5cf699,0 0 40px #8b5cf64d;transform:scaleY(1.1)}}.av-tooltip{position:fixed;z-index:1000;background:#18181bf2;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--border-opacity-15);border-radius:var(--radius-md);padding:var(--spacing-sm) var(--spacing-md);pointer-events:none;opacity:0;transform:translateY(4px);transition:opacity .15s ease,transform .15s ease;box-shadow:0 8px 32px #0006;min-width:120px}.av-tooltip.visible{opacity:1;transform:translateY(0)}.av-tooltip-word{font-size:1rem;font-weight:700;color:var(--text-primary);margin-bottom:4px}.av-tooltip-details{display:flex;gap:var(--spacing-md);font-size:.75rem;color:var(--text-secondary)}.av-tooltip-detail{display:flex;align-items:center;gap:4px}.av-tooltip-confidence{display:flex;align-items:center;gap:6px;margin-top:6px;padding-top:6px;border-top:1px solid var(--border-opacity-1)}.av-tooltip-bar{flex:1;height:4px;background:#ffffff1a;border-radius:2px;overflow:hidden}.av-tooltip-bar-fill{height:100%;border-radius:2px;transition:width .2s ease}.av-tooltip-bar-fill.high{background:linear-gradient(90deg,#22c55e,#4ade80)}.av-tooltip-bar-fill.medium{background:linear-gradient(90deg,#f59e0b,#fbbf24)}.av-tooltip-bar-fill.low{background:linear-gradient(90deg,#ef4444,#f87171)}.av-tooltip-score{font-weight:700;min-width:36px;text-align:right}.av-tooltip-score.high{color:var(--color-green-light)}.av-tooltip-score.medium{color:var(--color-amber-light)}.av-tooltip-score.low{color:var(--color-red-light)}.av-legend{display:flex;align-items:center;gap:var(--spacing-sm);margin-top:var(--spacing-md);padding-top:var(--spacing-md);border-top:1px solid var(--border-opacity-05);flex-wrap:wrap}.av-pill{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:var(--radius-full);font-size:.7rem;font-weight:600}.av-pill:before{content:"";width:8px;height:8px;border-radius:50%}.av-pill.green{background:#22c55e1a;color:#4ade80}.av-pill.green:before{background:var(--color-green-light)}.av-pill.yellow{background:#f59e0b1a;color:var(--color-amber-light)}.av-pill.yellow:before{background:var(--color-amber-light)}.av-pill.red{background:#ef44441a;color:var(--color-red-light)}.av-pill.red:before{background:var(--color-red-light)}.av-keyboard-hints{display:flex;gap:var(--spacing-md);margin-left:auto}.av-kbd-hint{display:flex;align-items:center;gap:4px;font-size:.65rem;color:var(--text-tertiary)}.av-kbd{display:inline-flex;align-items:center;justify-content:center;min-width:20px;height:20px;padding:0 5px;background:var(--bg-opacity-08);border:1px solid var(--border-opacity-15);border-radius:4px;font-size:.6rem;font-weight:600;color:var(--text-secondary);text-transform:uppercase}.av-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:var(--spacing-xl);min-height:128px}.av-loading-bars{display:flex;align-items:flex-end;gap:4px;height:40px}.av-loading-bar{width:4px;background:linear-gradient(180deg,var(--accent-glow),var(--accent-primary));border-radius:2px;animation:loadingPulse 1s ease-in-out infinite}.av-loading-bar:nth-child(1){height:60%;animation-delay:0s}.av-loading-bar:nth-child(2){height:100%;animation-delay:.1s}.av-loading-bar:nth-child(3){height:40%;animation-delay:.2s}.av-loading-bar:nth-child(4){height:80%;animation-delay:.3s}.av-loading-bar:nth-child(5){height:50%;animation-delay:.4s}@keyframes loadingPulse{0%,to{opacity:.4;transform:scaleY(1)}50%{opacity:1;transform:scaleY(1.2)}}.av-loading-text{font-size:.8rem;color:var(--text-tertiary)}.av-waveform.playing:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:linear-gradient(90deg,transparent,rgba(139,92,246,.05),transparent);animation:playingShimmer 2s linear infinite;pointer-events:none}@keyframes playingShimmer{0%{transform:translate(-100%)}to{transform:translate(100%)}}@media (max-width: 640px){.av-stats-bar{flex-wrap:wrap;gap:var(--spacing-sm)}.av-stat{flex:1 1 45%}.av-keyboard-hints{display:none}.av-header{flex-wrap:wrap;gap:var(--spacing-sm)}.av-time{order:-1;width:100%;text-align:center;margin-bottom:var(--spacing-xs)}}