:root{--neon-green: #39ff14;--neon-pink: #ff00e6;--neon-cyan: #00e5ff;--neon-purple: #8a2be2;--gold: #ffd700;--bg: #0b0b12;--bg-dark: #050508;--bg-light: #1a1a2e;--font: "Press Start 2P", "Courier New", monospace;--font-size-xs: 8px;--font-size-sm: 10px;--font-size-md: 12px;--font-size-lg: 16px;--font-size-xl: 20px;--font-size-xxl: 24px}*{box-sizing:border-box}body{background:var(--bg);color:#eee;font-family:var(--font);font-size:var(--font-size-md);margin:0;padding:0;overflow-x:hidden}.app{min-height:100vh;display:flex;flex-direction:column}.app-header{background:linear-gradient(90deg,var(--bg-dark),var(--bg-light),var(--bg-dark));padding:20px;border-bottom:2px solid var(--neon-green);box-shadow:0 0 20px var(--neon-green)}.neon-title{font-size:var(--font-size-xxl);color:var(--neon-green);text-align:center;margin:0;text-shadow:0 0 5px var(--neon-green),0 0 10px var(--neon-green),0 0 15px var(--neon-green);animation:neon-pulse 2s ease-in-out infinite alternate}@keyframes 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#ff3d00}.retro-button.active{background:var(--neon-pink);color:var(--bg-dark);border-color:var(--neon-pink)}.upload-container{max-width:800px;width:100%;text-align:center}.upload-header{margin-bottom:40px}.neon-text{font-size:var(--font-size-xl);color:var(--neon-cyan);text-shadow:0 0 10px var(--neon-cyan);margin-bottom:20px}.upload-subtitle{color:#ccc;font-size:var(--font-size-sm);line-height:1.5}.upload-zone{border:3px dashed var(--neon-green);border-radius:10px;padding:60px 40px;margin:40px 0;cursor:pointer;transition:all .3s ease;background:linear-gradient(135deg,rgba(57,255,20,.1),rgba(0,229,255,.1))}.upload-zone:hover{border-color:var(--neon-cyan);background:linear-gradient(135deg,rgba(57,255,20,.2),rgba(0,229,255,.2));transform:scale(1.02)}.upload-zone.drag-active{border-color:var(--neon-pink);background:linear-gradient(135deg,rgba(255,0,230,.2),rgba(138,43,226,.2))}.upload-zone.uploading{border-color:var(--gold);background:linear-gradient(135deg,rgba(255,215,0,.2),rgba(255,165,0,.2))}.upload-content{display:flex;flex-direction:column;align-items:center;gap:20px}.upload-icon{font-size:60px;animation:bounce 2s infinite}@keyframes bounce{0%,20%,50%,80%,to{transform:translateY(0)}40%{transform:translateY(-10px)}60%{transform:translateY(-5px)}}.upload-content h3{color:var(--neon-green);font-size:var(--font-size-lg);margin:0}.file-types{display:flex;gap:20px;justify-content:center}.file-type{background:var(--neon-green);color:var(--bg-dark);padding:5px 15px;border-radius:15px;font-size:var(--font-size-xs);font-weight:700}.file-limit{color:#999;font-size:var(--font-size-xs)}.upload-progress{display:flex;flex-direction:column;align-items:center;gap:20px}.progress-spinner{position:relative}.spinner{width:50px;height:50px;border:3px solid var(--neon-green);border-top:3px solid transparent;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.progress-bar{width:300px;height:20px;background:var(--bg-dark);border:2px solid var(--neon-green);border-radius:10px;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,var(--neon-green),var(--neon-cyan));transition:width .3s ease;animation:progress-glow 2s ease-in-out infinite alternate}@keyframes progress-glow{0%{box-shadow:0 0 5px var(--neon-green)}to{box-shadow:0 0 20px var(--neon-green)}}.upload-features{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:20px;margin-top:40px}.feature{display:flex;flex-direction:column;align-items:center;gap:10px;padding:20px;background:rgba(57,255,20,.1);border:1px solid var(--neon-green);border-radius:10px}.feature-icon{font-size:30px}.mic-check-container{max-width:900px;width:100%}.mic-check-header{text-align:center;margin-bottom:40px}.mic-check-content{display:grid;grid-template-columns:1fr 1fr;gap:40px;margin-bottom:40px}.mic-section,.webcam-section{background:rgba(57,255,20,.1);border:2px solid var(--neon-green);border-radius:10px;padding:30px}.mic-section h3,.webcam-section h3{color:var(--neon-cyan);margin-bottom:20px;text-align:center}.permission-denied{text-align:center;color:#ff3d00}.mic-status{display:flex;flex-direction:column;align-items:center;gap:20px}.audio-level-display{width:20px;height:200px;background:var(--bg-dark);border:2px solid var(--neon-green);border-radius:10px;position:relative;overflow:hidden}.audio-level-bar{position:absolute;bottom:0;width:100%;transition:height .1s ease;border-radius:8px}.level-text{font-size:var(--font-size-sm);font-weight:700;text-transform:uppercase}.level-text.too-quiet{color:#ff3d00}.level-text.getting-there{color:var(--gold)}.level-text.perfect{color:var(--neon-green)}.level-text.too-loud{color:var(--neon-pink)}.level-value{font-size:var(--font-size-lg);color:var(--neon-cyan)}.motion-toggle{display:flex;flex-direction:column;align-items:center;gap:20px}.webcam-preview{position:relative;border:2px solid var(--neon-pink);border-radius:10px;overflow:hidden}.webcam-feed{width:100%;height:auto;display:block}.motion-indicator{position:absolute;top:10px;right:10px;background:rgba(0,0,0,.7);color:var(--neon-pink);padding:5px 10px;border-radius:5px;font-size:var(--font-size-xs);display:flex;align-items:center;gap:5px}.pulse{animation:pulse 1s infinite}@keyframes 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recording-pulse{0%,to{opacity:1}50%{opacity:.3}}.session-time{color:var(--neon-cyan);font-weight:700}.song-info{background:rgba(0,229,255,.1);border:2px solid var(--neon-cyan);border-radius:10px;padding:20px}.info-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:15px}.info-item{display:flex;justify-content:space-between}.info-item .label{color:var(--neon-cyan);font-size:var(--font-size-xs)}.info-item .value{color:var(--neon-green);font-weight:700}.crt:after{content:"";position:absolute;left:0;top:0;right:0;bottom:0;background:repeating-linear-gradient(to bottom,rgba(255,255,255,.07) 0px,rgba(255,255,255,.07) 1px,transparent 2px,transparent 4px);pointer-events:none;border-radius:10px}.neon-title,.score-value,.current-lyric,.song-info h3{text-shadow:0 0 2px currentColor!important}.video-karaoke-player{width:100%;background:linear-gradient(135deg,#0a0a0a 0%,#1a0a2e 100%);border:3px solid #0ff;border-radius:10px;padding:20px;box-shadow:0 0 30px #00ffff4d}.video-container{position:relative;width:100%;aspect-ratio:16 / 9;background:#000;border:2px solid #f0f;border-radius:8px;overflow:hidden;margin:0 auto 20px}.karaoke-video{width:100%;height:100%;object-fit:contain;display:block}.video-overlay{position:absolute;top:0;left:0;right:0;bottom:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,.3);opacity:0;transition:opacity .3s ease;pointer-events:none}.video-container:hover .video-overlay{opacity:1;pointer-events:all}.play-pause-overlay{width:80px;height:80px;background:rgba(0,255,255,.2);border:3px solid #0ff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:36px;cursor:pointer;transition:all .3s ease}.play-pause-overlay:hover{background:rgba(0,255,255,.4);transform:scale(1.1);box-shadow:0 0 20px #0ff9}.playback-controls{display:flex;flex-direction:column;gap:15px}.progress-section{display:flex;align-items:center;gap:10px}.time-display{font-family:"Press Start 2P",monospace;font-size:12px;color:#0ff;min-width:60px;text-align:center}.progress-bar{flex:1;height:8px;background:#333;border:2px solid #0ff;border-radius:4px;cursor:pointer;position:relative;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,#0ff 0%,#f0f 100%);transition:width .1s linear;box-shadow:0 0 10px #0ff9}.progress-bar:hover{box-shadow:0 0 15px #0ffc}.control-buttons{display:flex;align-items:center;gap:15px;flex-wrap:wrap}.control-btn{font-family:"Press Start 2P",monospace;font-size:12px;padding:12px 20px;background:linear-gradient(135deg,#1a1a2e 0%,#16213e 100%);color:#0ff;border:2px solid #0ff;border-radius:6px;cursor:pointer;transition:all .3s ease;text-transform:uppercase}.control-btn:hover:not(:disabled){background:linear-gradient(135deg,#0ff 0%,#f0f 100%);color:#000;box-shadow:0 0 20px #0ff9;transform:translateY(-2px)}.control-btn:disabled{opacity:.3;cursor:not-allowed}.control-btn.active{background:linear-gradient(135deg,#f0f 0%,#ff0 100%);border-color:#f0f;animation:pulse 1s ease-in-out infinite}@keyframes pulse{0%,to{box-shadow:0 0 15px #f0f9}50%{box-shadow:0 0 30px #ff00ffe6}}.volume-control{display:flex;align-items:center;gap:10px;margin-left:auto}.volume-icon{font-size:20px}.volume-slider{width:100px;height:6px;background:#333;border:1px solid #0ff;border-radius:3px;outline:none;cursor:pointer;-webkit-appearance:none}.volume-slider::-webkit-slider-thumb{-webkit-appearance:none;width:16px;height:16px;background:#0ff;border-radius:50%;cursor:pointer;box-shadow:0 0 10px #0ffc}.volume-slider::-moz-range-thumb{width:16px;height:16px;background:#0ff;border-radius:50%;cursor:pointer;border:none;box-shadow:0 0 10px #0ffc}.sync-control{display:flex;align-items:center;gap:10px}.sync-icon{font-size:20px;cursor:help}.sync-label{font-family:"Press Start 2P",monospace;font-size:10px;color:#0ff;min-width:50px;text-align:right}.sync-slider{width:100px;height:6px;background:#333;border:1px solid #0ff;border-radius:3px;outline:none;cursor:pointer;-webkit-appearance:none}.sync-slider::-webkit-slider-thumb{-webkit-appearance:none;width:16px;height:16px;background:#f0f;border-radius:50%;cursor:pointer;box-shadow:0 0 10px #f0fc}.sync-slider::-moz-range-thumb{width:16px;height:16px;background:#f0f;border-radius:50%;cursor:pointer;border:none;box-shadow:0 0 10px #f0fc}.song-info{text-align:center;padding:15px;background:rgba(0,0,0,.3);border:1px solid #0ff;border-radius:6px}.song-info h3{font-family:"Press Start 2P",monospace;font-size:16px;color:#f0f;margin:0 0 10px;text-shadow:0 0 10px rgba(255,0,255,.8)}.song-metadata{display:flex;justify-content:center;gap:20px;flex-wrap:wrap}.metadata-item{font-family:"Press Start 2P",monospace;font-size:10px;color:#0ff;padding:5px 10px;background:rgba(0,255,255,.1);border:1px solid #0ff;border-radius:4px}.no-song{padding:60px 20px;text-align:center}.no-song p{font-family:"Press Start 2P",monospace;font-size:14px;color:#666}.live-hud{position:relative;width:100%;background:#000;border:3px solid #0ff;border-radius:10px;padding:15px;box-shadow:0 0 30px #00ffff4d;height:fit-content}.hud-canvas{width:100%;height:auto;display:block;border:1px solid #f0f;border-radius:5px;image-rendering:crisp-edges;image-rendering:pixelated}.key-shift-indicator{position:absolute;top:20px;right:20px;font-family:"Press Start 2P",monospace;font-size:12px;color:#ff0;background:rgba(0,0,0,.8);padding:10px 15px;border:2px solid #ff0;border-radius:6px;box-shadow:0 0 15px #ff09;animation:blink 1s ease-in-out infinite}@keyframes blink{0%,to{opacity:1}50%{opacity:.6}}.karaoke-stage{display:grid;grid-template-columns:1fr 500px;gap:20px;padding:20px;background:linear-gradient(135deg,#0a0a0a 0%,#1a0a2e 100%);min-height:100vh;align-items:start}@media (max-width: 1200px){.karaoke-stage{grid-template-columns:1fr;gap:20px}.live-hud canvas{max-width:100%;height:auto}}@media (max-width: 850px){.video-karaoke-player{padding:10px}.video-container{width:100%;aspect-ratio:16 / 9}.control-buttons{flex-direction:column;width:100%}.control-btn{width:100%}.volume-control,.sync-control{margin-left:0;width:100%;justify-content:center}.song-info h3{font-size:12px}.metadata-item{font-size:8px}}