:root{--primary: #06B6D4;--primary-dark: #0891B2;--bg-base: #0F0F0F;--bg-elevated: #1A1A1A;--bg-hover: #252525;--border: rgba(255, 255, 255, .06);--border-strong: rgba(255, 255, 255, .12);--text-primary: #FFFFFF;--text-secondary: rgba(255, 255, 255, .65);--text-tertiary: rgba(255, 255, 255, .45);--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 20px;--space-6: 24px;--space-8: 32px;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 14px;--radius-full: 9999px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,system-ui,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}button{font-family:inherit;cursor:pointer;border:none;background:none}.ytms-sidebar{position:fixed;left:10px;top:0;width:64px;height:100vh;background:#14161eb3;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-left:1px solid rgba(255,255,255,.06);border-right:1px solid rgba(255,255,255,.06);z-index:100;transition:width .2s cubic-bezier(.4,0,.2,1);overflow:hidden;display:none;flex-direction:column}.ytms-sidebar:hover{width:280px;box-shadow:4px 0 16px #0006}body.player-active .ytms-sidebar{display:flex!important}body.player-active .yt-multitrack-controls{margin-left:48px}body.player-active .yt-timeline-container{margin-left:0}body.player-active .yt-main{margin-left:15px}body.player-active .split-topbar{padding-left:calc(48px + var(--space-4));margin-top:48px}.mastering-topbar{height:48px;background:#0009;border-bottom:1px solid rgba(255,255,255,.06);display:flex;align-items:center;padding:0 24px 0 80px;position:fixed;top:0;left:0;right:0;z-index:20;backdrop-filter:blur(12px)}.nav-logo{display:flex;align-items:center;gap:8px;text-decoration:none;font-weight:700;font-size:14px;color:#fff}.nav-logo-icon{width:24px;height:24px}.cyan{color:#06b6d4}.ytms-sidebar-logo{width:64px;height:103.5px;box-sizing:border-box;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-bottom:12px;border-bottom:1px solid rgba(255,255,255,.06);padding:8px 0}.ytms-logo-link{display:flex;align-items:center;justify-content:center;text-decoration:none;width:100%;height:100%;transition:all .2s ease;border-radius:8px}.ytms-logo-link:hover{background:#06b6d414}.ytms-logo-container{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px}.ytms-logo-wave{width:28px;height:28px;flex-shrink:0}.ytms-logo-link:hover .ytms-logo-wave path{stroke:#0ea5e9}.ytms-logo-text{display:block!important;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:10px;font-weight:800;color:#06b6d4!important;text-align:center;letter-spacing:.3px;text-transform:none;opacity:1!important;margin:0;line-height:1}.ytms-logo-link:hover .ytms-logo-text{color:#0ea5e9!important}.ytms-sidebar:hover .ytms-sidebar-logo{width:240px;justify-content:flex-start;padding-left:16px}.ytms-sidebar:hover .ytms-logo-container{flex-direction:row;gap:10px}.ytms-sidebar:hover .ytms-logo-text{font-size:14px;font-weight:700;letter-spacing:-.02em}@keyframes wave-opacity{0%,to{opacity:1}50%{opacity:.5}}.wave-path-1{animation:wave-opacity 2s ease-in-out infinite}.wave-path-2{animation:wave-opacity 2s ease-in-out infinite .3s}.wave-path-3{animation:wave-opacity 2s ease-in-out infinite .6s}@media (pointer: coarse) and (hover: none){.wave-path-1,.wave-path-2,.wave-path-3{animation:none}}.ytms-sidebar-nav{width:100%;display:flex;flex-direction:column;gap:4px;padding:0;flex:1;overflow-y:auto;overflow-x:hidden}.ytms-sidebar-nav::-webkit-scrollbar{width:3px}.ytms-sidebar-nav::-webkit-scrollbar-thumb{background:#ffffff1a}.ytms-nav-item{width:64px;height:48px;display:flex;align-items:center;justify-content:center;color:#666;text-decoration:none;font-size:14px;font-weight:500;transition:all .2s ease;position:relative;border-radius:8px;flex-shrink:0}.ytms-sidebar:hover .ytms-nav-item{width:100%;justify-content:flex-start;padding:0 12px}.ytms-nav-item svg{width:22px;height:22px;flex-shrink:0}.ytms-nav-item span:first-of-type{display:none;margin-left:12px}.ytms-sidebar:hover .ytms-nav-item span:first-of-type{display:inline}.ytms-nav-item:hover{background:#ffffff0d;color:#06b6d4}.ytms-nav-item.active{background:#06b6d41a;color:#06b6d4}.ytms-nav-item.active:before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:3px;height:24px;background:#06b6d4;border-radius:0 2px 2px 0}.ytms-badge{display:none;padding:2px 6px;background:#06b6d426;border:1px solid rgba(6,182,212,.3);border-radius:4px;font-size:9px;font-weight:700;color:#06b6d4;text-transform:uppercase;margin-left:auto}.ytms-sidebar:hover .ytms-badge{display:inline-flex}.ytms-sidebar-section,.ytms-sidebar-footer{display:none}.ytms-sidebar:hover .ytms-sidebar-section,.ytms-sidebar:hover .ytms-sidebar-footer{display:block}.ytms-sidebar-section{width:100%;padding:16px 12px;border-top:1px solid rgba(255,255,255,.06)}.ytms-section-header{margin-bottom:12px}.ytms-section-header h3{font-size:11px;font-weight:700;color:#fff6;letter-spacing:.1em;text-transform:uppercase;margin:0}.ytms-new-setlist{width:100%;display:flex;align-items:center;gap:8px;padding:10px 12px;background:transparent;border:1px dashed rgba(6,182,212,.3);border-radius:8px;color:#06b6d4;font-size:13px;font-weight:600;cursor:pointer;transition:all .2s ease;margin-bottom:12px}.ytms-new-setlist:hover{background:#06b6d40d;border-color:#06b6d480}.ytms-setlists{display:flex;flex-direction:column;gap:4px}.ytms-setlist-item{padding:8px 12px;background:#ffffff08;border-radius:6px;color:#fff9;font-size:13px;cursor:pointer;transition:all .2s ease}.ytms-setlist-item:hover{background:#ffffff0f;color:#ffffffe6}.ytms-sidebar-footer{height:80px;box-sizing:border-box;display:flex;align-items:center;padding:0 12px;border-top:1px solid rgba(255,255,255,.08);margin-top:auto;flex-shrink:0}.ytms-user-profile{display:flex;align-items:center;gap:12px;padding:4px;border-radius:8px;cursor:pointer;transition:background .2s ease}.ytms-user-profile:hover{background:#ffffff0d}.ytms-user-avatar{width:32px;height:32px;border-radius:50%;overflow:hidden;flex-shrink:0;background:#06b6d433;border:2px solid rgba(6,182,212,.3)}.ytms-user-avatar img{width:100%;height:100%;object-fit:cover}.ytms-user-info{flex:1;overflow:hidden;opacity:0;transition:opacity .2s ease}.ytms-sidebar:hover .ytms-user-info{opacity:1}.ytms-user-name{font-size:13px;font-weight:600;color:#fff;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.ytms-user-plan{font-size:11px;color:#fff6}.ytms-sidebar-toggle,.ytms-sidebar-overlay{display:none!important}@media (max-width: 768px){.ytms-sidebar{display:none!important}}.split-upload-container{padding:var(--space-8) var(--space-6);max-width:1200px;margin:0 auto;position:relative;z-index:1;min-height:100vh;display:flex;flex-direction:column;justify-content:center}.split-bg-images{position:fixed;inset:0;z-index:-2}.split-bg-image{position:absolute;inset:0;background-size:cover;background-position:center;opacity:0;transition:opacity 2s ease-in-out}.split-bg-image.active{opacity:1}.split-bg-overlay{position:fixed;inset:0;background:linear-gradient(135deg,#0f0f0ff2,#0f0f0fd9,#0f0f0ff2);backdrop-filter:blur(8px);z-index:-1}.split-header{text-align:center;margin-bottom:var(--space-8);position:relative;z-index:1}.split-title{font-size:32px;font-weight:700;color:var(--text-primary);margin-bottom:var(--space-2);letter-spacing:-.5px}.split-subtitle{font-size:15px;color:var(--text-secondary);font-weight:400;line-height:1.5}.split-tabs{display:flex;gap:0;border-bottom:1px solid var(--border);margin-bottom:var(--space-8);justify-content:center;position:relative;z-index:1}.split-tab{padding:var(--space-4) var(--space-6);color:var(--text-tertiary);font-size:14px;font-weight:600;position:relative;transition:color .2s ease;display:flex;align-items:center;gap:var(--space-2)}.split-tab:hover{color:var(--text-secondary)}.split-tab.active{color:var(--text-primary)}.split-tab.active:after{content:"";position:absolute;bottom:-1px;left:0;right:0;height:2px;background:var(--primary)}.split-tab-content{display:none;position:relative;z-index:1}.split-tab-content.active{display:block}.split-dropzone{border:2px dashed var(--border);border-radius:var(--radius-lg);padding:var(--space-12);text-align:center;cursor:pointer;transition:all .2s ease;background:var(--bg-elevated);position:relative;z-index:1}.split-dropzone:hover{border-color:var(--border-strong);background:var(--bg-hover)}.split-dropzone.dragover{border-color:var(--primary);border-style:solid;background:#06b6d40d}.split-drop-icon{width:64px;height:64px;margin:0 auto var(--space-6);border-radius:var(--radius-full);background:var(--primary);display:flex;align-items:center;justify-content:center;color:#000}.split-drop-icon svg{width:28px;height:28px}.split-drop-main{font-size:16px;font-weight:600;color:var(--text-primary);margin-bottom:var(--space-2)}.split-drop-formats{font-size:13px;color:var(--text-tertiary)}.split-options{margin-top:var(--space-8);position:relative;z-index:1}.split-options-label{font-size:14px;color:var(--text-secondary);margin-bottom:var(--space-4);font-weight:600;text-align:center}.split-stems-selector{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-4);max-width:480px;margin:0 auto var(--space-6);position:relative;z-index:1}.split-stem-btn{padding:var(--space-5);background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-md);cursor:pointer;transition:all .2s ease;display:flex;flex-direction:column;align-items:center;gap:var(--space-2)}.split-stem-btn:hover{background:var(--bg-hover);border-color:var(--border-strong)}.split-stem-btn.active{background:#06b6d414;border-color:var(--primary)}.split-stem-number{font-size:28px;font-weight:700;color:var(--primary)}.split-stem-desc{font-size:12px;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px;font-weight:600}.split-stems-info{display:flex;gap:var(--space-3);justify-content:center;flex-wrap:wrap}.split-stem-tag{padding:var(--space-2) var(--space-4);background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-full);font-size:13px;color:var(--text-secondary);font-weight:500}.split-cloud-placeholder{text-align:center;padding:var(--space-12);color:var(--text-tertiary)}.split-player-container{position:fixed;inset:0;background:linear-gradient(180deg,#1c1e2a,#15161d 55%,#101015);display:flex;flex-direction:column}.split-topbar{height:56px;background:#14161eb3;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid rgba(255,255,255,.06);display:flex;align-items:center;justify-content:space-between;padding:0 var(--space-4);flex-shrink:0}.split-topbar-left{display:flex;align-items:center;gap:var(--space-4);flex:1}.split-back-btn{width:32px;height:32px;border-radius:var(--radius-sm);background:transparent;display:flex;align-items:center;justify-content:center;color:var(--text-primary);transition:all .2s ease}.split-back-btn:hover{background:var(--bg-hover)}.split-song-info{display:flex;align-items:center;gap:var(--space-3)}.split-song-thumb{width:36px;height:36px;border-radius:4px;background:linear-gradient(135deg,var(--primary),var(--primary-dark));display:flex;align-items:center;justify-content:center;color:#fff;flex-shrink:0}.split-song-title{font-size:14px;font-weight:600;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:300px}.split-topbar-center{display:flex;align-items:center;gap:var(--space-3)}.split-topbar-right{display:flex;align-items:center;gap:var(--space-2);flex:1;justify-content:flex-end}.split-top-btn{height:32px;padding:0 var(--space-4);background:linear-gradient(#06b6d41a,#06b6d41a),#16171f;border:1px solid rgba(6,182,212,.18);border-radius:var(--radius-sm);color:var(--text-secondary);font-size:13px;font-weight:600;transition:all .2s ease;display:flex;align-items:center;gap:var(--space-2);white-space:nowrap}.split-top-btn:hover{filter:brightness(1.12);border-color:#06b6d459;color:#fff}.split-top-btn.primary{background:linear-gradient(135deg,#06b6d4,#8b5cf6,#ec4899);color:#fff;border-color:transparent;font-weight:700}.split-top-btn.primary:hover{filter:brightness(1.08);border-color:transparent}.split-top-btn svg{width:14px;height:14px}.split-info-pill{height:32px;padding:0 var(--space-3);background:linear-gradient(#06b6d41a,#06b6d41a),#16171f;border:1px solid rgba(6,182,212,.18);border-radius:var(--radius-sm);color:var(--text-primary);font-size:13px;font-weight:600;display:flex;align-items:center;gap:var(--space-2);cursor:pointer;transition:all .2s ease}.split-info-pill:hover{filter:brightness(1.12);border-color:#06b6d459}.split-info-pill svg{width:14px;height:14px}.split-info-pill.disabled{opacity:.3;cursor:not-allowed;pointer-events:none}.yt-main{flex:1;display:flex;overflow:hidden}.yt-multitrack-container{width:100%;display:flex;overflow-y:auto;overflow-x:hidden;scrollbar-width:thin;scrollbar-color:var(--bg-hover) transparent}.yt-multitrack-container::-webkit-scrollbar{width:4px}.yt-multitrack-container::-webkit-scrollbar-thumb{background:var(--bg-hover);border-radius:10px}.yt-multitrack-controls{display:flex;flex-direction:column;width:220px;min-height:100%;padding:var(--space-6) 0;background:#1c1e2a8c;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-right:1px solid rgba(255,255,255,.06);flex-shrink:0}.yt-channel-container{height:72px;display:flex;padding:var(--space-4) var(--space-5);transition:background .15s ease;align-items:center}.yt-channel-container:hover{background:var(--bg-hover)}.yt-channel-column{display:flex}.yt-channel-column:first-child{flex:1;padding-right:var(--space-4);flex-direction:column;justify-content:center}.yt-channel-column:nth-child(2){align-items:center;padding-bottom:6px}.yt-channel-line{display:flex;align-items:center;margin-bottom:var(--space-2)}.yt-channel-title{font-size:13px;font-weight:600;color:var(--text-primary);margin-left:var(--space-2)}.yt-controls-container{display:flex;gap:2px}.yt-controls-button{width:20px;height:20px;border-radius:4px;display:flex;align-items:center;justify-content:center;transition:all .15s ease}.yt-button-mute{background:#ffffff1a;color:#fff9}.yt-button-mute:hover{background:#ffffff26;color:#ffffffe6}.yt-button-mute.muted{background:#ffd70026;color:gold}.yt-button-solo{background:#ffffff1a;color:#fff9}.yt-button-solo:hover{background:#ffffff26;color:#ffffffe6}.yt-button-solo.active{background:gold;color:#000}.yt-button-download{background:#06b6d41a;color:#06b6d4cc}.yt-button-download:hover{background:#06b6d433;color:#06b6d4}.yt-input-range-container{height:20px;display:flex;align-items:center}.yt-input-range{width:100%;height:2px;cursor:pointer;border-radius:2px;background:#ffffff1a;-webkit-appearance:none;appearance:none;background-size:0;background-repeat:no-repeat;background-image:linear-gradient(90deg,var(--primary),var(--primary))}.yt-input-range::-webkit-slider-thumb{-webkit-appearance:none;width:14px;height:14px;border-radius:50%;background:var(--bg-base);border:2px solid var(--primary);cursor:pointer;transition:all .15s ease}.yt-input-range::-moz-range-thumb{width:14px;height:14px;border-radius:50%;background:var(--bg-base);border:2px solid var(--primary);cursor:pointer;transition:all .15s ease}.yt-input-range:hover::-webkit-slider-thumb{transform:scale(1.15)}.yt-input-range:hover::-moz-range-thumb{transform:scale(1.15)}.yt-pan-container,.yt-pan-visual{position:relative;width:28px;height:28px}.yt-pan-marker{z-index:3;left:50%;top:50%;width:0;height:0;position:absolute;transform-origin:center center;transition:transform .1s ease}.yt-pan-marker span{left:-1px;bottom:1px;width:2px;height:12px;position:absolute;background:var(--primary);border-radius:1px}.yt-pan-left{top:0;left:0;bottom:0;overflow:hidden;position:absolute;transform:scaleX(-1);width:14px;z-index:1}.yt-pan-left .yt-pan-circular{margin-left:-14px}.yt-pan-right{top:0;right:0;bottom:0;overflow:hidden;position:absolute;width:14px;z-index:1}.yt-pan-right .yt-pan-circular{margin-left:-14px}.yt-pan-circular{width:28px;height:28px;position:relative;border-radius:50%;background:conic-gradient(from 270deg,#06b6d4 0deg calc(var(--pan-fill, 50) * 1%),#06b6d426 calc(var(--pan-fill, 50) * 1%) 100%);border:2px solid rgba(6,182,212,.4);transition:background .15s ease}.yt-pan-circular[data-pan="0"]{background:#06b6d426;border-color:#06b6d44d}.yt-pan-left .yt-pan-circular{background:conic-gradient(from 0deg,rgba(6,182,212,.5) 0deg,rgba(6,182,212,.5) 180deg,transparent 180deg)}.yt-pan-right .yt-pan-circular{background:conic-gradient(from 180deg,rgba(6,182,212,.5) 0deg,rgba(6,182,212,.5) 180deg,transparent 180deg)}.yt-pan-inner{z-index:2;top:50%;left:50%;width:20px;height:20px;position:absolute;border-radius:50%;background:var(--bg-elevated);transform:translate(-50%,-50%)}.yt-pan-range{z-index:4;top:0;left:-4px;width:36px;opacity:0;position:absolute;transform:rotate(270deg);cursor:move;-webkit-appearance:none;appearance:none}.yt-pan-label-left,.yt-pan-label-right{position:absolute;bottom:-6px;opacity:.4;font-size:10px;color:var(--text-tertiary)}.yt-pan-label-left{left:0}.yt-pan-label-right{right:0}.yt-button-reset{font-size:13px;font-weight:600;margin:var(--space-5) auto;padding:var(--space-3) var(--space-6);background:linear-gradient(#06b6d41a,#06b6d41a),#16171f;border:1px solid rgba(6,182,212,.18);color:var(--text-primary);border-radius:var(--radius-sm);transition:all .2s ease}.yt-button-reset:hover{filter:brightness(1.12);border-color:#06b6d459}.yt-timeline-container{flex:1;display:flex;flex-direction:column;padding:0 var(--space-6) var(--space-6);background:transparent}.yt-timeline-content{position:relative;min-height:320px}.yt-timeline-cursor-container{z-index:6;top:0;left:0;width:100%;height:32px;position:absolute}.yt-timeline-cursor-range{opacity:0;z-index:2;height:28px;cursor:pointer;width:100%;position:relative;-webkit-appearance:none;appearance:none}.yt-timeline-needle{z-index:1;top:0;left:0;width:2px;height:100%;position:absolute;background:#fff;will-change:transform;transition:none;pointer-events:none;transform:translate(0)}.yt-timeline-needle svg{position:relative;left:-6px;top:0}.yt-waveforms-container{z-index:1;top:0;left:0;right:0;position:absolute;display:flex;flex-direction:column;padding-top:32px;gap:var(--space-2)}.yt-waveform-master{width:100%;height:52px;margin-bottom:var(--space-2)}.yt-waveform-master canvas{width:100%;height:52px;background:transparent!important}.yt-waveform{height:52px;border-radius:var(--radius-md);margin-bottom:var(--space-2);position:relative;overflow:hidden;background:#06b6d41f!important;border:1px solid rgba(6,182,212,.2);transition:all .2s ease}.yt-waveform:hover{background:#06b6d42e!important;border-color:#06b6d466}.yt-waveform canvas{width:100%;height:52px;background:transparent!important}.yt-metronome-container{z-index:6;display:flex;position:absolute;bottom:var(--space-6);left:var(--space-3);gap:var(--space-1)}.yt-metronome-button{font-size:13px;font-weight:600;padding:var(--space-1) var(--space-4);min-width:48px;height:24px;border-radius:var(--radius-sm);color:var(--text-secondary);background:var(--bg-elevated);border:1px solid var(--border);transition:all .15s ease}.yt-metronome-button:hover{background:var(--bg-hover);color:var(--text-primary)}.yt-metronome-button.active{background:var(--text-primary);color:#000;border-color:var(--text-primary)}.split-player-bar{height:80px;background:#14161eb3;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-top:1px solid rgba(255,255,255,.06);display:flex;align-items:center;padding:0 var(--space-6);gap:var(--space-6);flex-shrink:0;justify-content:center;padding-left:280px!important}.split-volume-btn{width:32px;height:32px;border-radius:var(--radius-sm);background:transparent;display:flex;align-items:center;justify-content:center;color:var(--text-primary);transition:all .2s ease;margin-right:auto}.split-volume-btn:hover{background:var(--bg-hover)}.split-volume-btn svg{width:20px;height:20px}.split-transport{display:flex;align-items:center;gap:var(--space-2);position:absolute;left:50%;transform:translate(-50%);margin-bottom:27px}.split-transport-btn{width:32px;height:32px;border-radius:var(--radius-sm);background:transparent;display:flex;align-items:center;justify-content:center;color:var(--text-primary);transition:all .2s ease}.split-transport-btn:hover{background:var(--bg-hover)}.split-transport-btn.active{color:#06b6d4}.split-transport-btn svg{width:18px;height:18px}.split-play-btn{width:40px;height:40px;border-radius:var(--radius-full);background:linear-gradient(135deg,#06b6d4,#8b5cf6,#ec4899);display:flex;align-items:center;justify-content:center;color:#fff;transition:all .2s ease;flex-shrink:0}.split-play-btn:hover{transform:scale(1.05)}.split-play-btn:active{transform:scale(.98)}.split-play-btn svg{width:20px;height:20px}.split-timeline-bar{flex:1;display:flex;flex-direction:column;gap:var(--space-2)}.split-timeline-times{display:flex;justify-content:space-between;font-size:12px;color:var(--text-tertiary);font-weight:500;font-variant-numeric:tabular-nums}.split-timeline-track{height:4px;background:#ffffff1a;border-radius:2px;position:relative;cursor:pointer}.split-timeline-progress{position:absolute;left:0;top:0;height:100%;background:var(--text-primary);border-radius:2px;transition:width .1s linear}@media (pointer: coarse) and (hover: none){.split-timeline-progress{transition:none}.yt-timeline-needle{will-change:transform}}.split-timeline-thumb{position:absolute;top:50%;right:-6px;transform:translateY(-50%);width:12px;height:12px;background:#fff;border-radius:50%;transition:transform .15s ease}.split-timeline-track:hover .split-timeline-thumb{transform:translateY(-50%) scale(1.2)}.split-player-controls{display:flex;align-items:center;gap:var(--space-2)}.split-player-control-btn{height:32px;padding:0 var(--space-4);background:linear-gradient(#06b6d41a,#06b6d41a),#16171f;border:1px solid rgba(6,182,212,.18);border-radius:var(--radius-sm);color:var(--text-secondary);font-size:13px;font-weight:600;transition:all .2s ease;display:flex;align-items:center;gap:var(--space-2)}.split-player-control-btn:hover{filter:brightness(1.12);border-color:#06b6d459;color:#fff}.split-player-control-btn.active{background:linear-gradient(135deg,#06b6d4,#8b5cf6,#ec4899);border-color:transparent;color:#fff}.split-player-control-btn svg{width:14px;height:14px}@media (max-width: 768px){.split-upload-container{padding:var(--space-6) var(--space-4)}.split-title{font-size:24px}.split-stems-selector{grid-template-columns:repeat(2,1fr)}.yt-multitrack-controls{width:100%;padding:var(--space-6) var(--space-4)}.yt-timeline-container{display:none}.split-topbar{padding:0 var(--space-3)}.split-player-bar{padding:0 var(--space-4);gap:var(--space-4)}.split-play-btn{width:36px;height:36px}.ytms-sidebar{width:100%;left:-100%}.ytms-sidebar.open{left:0}.ytms-sidebar-toggle{left:16px;top:16px}}@media (min-width: 769px){.yt-multitrack-controls{width:220px}}button:focus-visible{outline:2px solid var(--primary);outline-offset:2px}.split-dropdown{position:absolute;background:var(--bg-elevated);border:1px solid var(--border-strong);border-radius:var(--radius-lg);box-shadow:0 8px 32px #0006;min-width:280px;overflow:hidden;z-index:1000}.split-dropdown-header{padding:var(--space-4) var(--space-5);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}.split-dropdown-header h3{font-size:14px;font-weight:600;color:var(--text-primary)}.split-dropdown-close{width:28px;height:28px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;color:var(--text-secondary);transition:all .2s ease}.split-dropdown-close:hover{background:var(--bg-hover);color:var(--text-primary)}.split-dropdown-body{padding:var(--space-5)}.split-value-display{display:flex;align-items:center;justify-content:center;gap:var(--space-4);margin-bottom:var(--space-5)}.split-value-btn{width:40px;height:40px;border-radius:var(--radius-sm);background:var(--bg-hover);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;color:var(--text-primary);transition:all .2s ease}.split-value-btn:hover{background:var(--bg-base);border-color:var(--border-strong)}.split-value-main{text-align:center;min-width:100px}.split-value-number{font-size:48px;font-weight:700;color:var(--text-primary);line-height:1}.split-value-label{font-size:13px;color:var(--text-tertiary);margin-top:var(--space-2)}.split-tuning-selector{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--space-5);padding:var(--space-3) var(--space-4);background:var(--bg-base);border-radius:var(--radius-sm)}.split-tuning-selector label{font-size:13px;color:var(--text-secondary);font-weight:500}.split-tuning-selector select{background:var(--bg-hover);border:1px solid var(--border);color:var(--text-primary);padding:var(--space-2) var(--space-3);border-radius:var(--radius-sm);font-size:13px;cursor:pointer}.split-toggle-row{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--space-5)}.split-toggle-row label{font-size:14px;color:var(--text-secondary);font-weight:500}.split-toggle{position:relative;display:inline-block;width:44px;height:24px}.split-toggle input{opacity:0;width:0;height:0}.split-toggle-slider{position:absolute;cursor:pointer;inset:0;background:var(--bg-hover);border:1px solid var(--border);border-radius:12px;transition:all .3s ease}.split-toggle-slider:before{position:absolute;content:"";height:18px;width:18px;left:2px;bottom:2px;background:var(--text-tertiary);border-radius:50%;transition:all .3s ease}.split-toggle input:checked+.split-toggle-slider{background:var(--primary);border-color:var(--primary)}.split-toggle input:checked+.split-toggle-slider:before{background:#000;transform:translate(20px)}.split-count-label{font-size:13px;color:var(--text-secondary);text-align:center;margin-bottom:var(--space-4)}.split-reset-btn{width:100%;padding:var(--space-3);background:var(--bg-hover);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-primary);font-size:14px;font-weight:600;transition:all .2s ease}.split-reset-btn:hover{background:var(--bg-base);border-color:var(--border-strong)}.split-fullscreen-panel{position:fixed;inset:0;background:var(--bg-base);z-index:9999;display:none;flex-direction:column;overflow:hidden}.lyrics-panel-header{padding:var(--space-5) var(--space-6);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}.lyrics-panel-header h2{font-size:18px;font-weight:600;color:var(--text-primary)}.lyrics-edit-btn{display:flex;align-items:center;gap:var(--space-2);padding:var(--space-2) var(--space-4);background:var(--bg-hover);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-secondary);font-size:13px;font-weight:600;transition:all .2s ease}.lyrics-edit-btn:hover{background:var(--bg-elevated);color:var(--text-primary)}.lyrics-panel-content{flex:1;overflow-y:auto;padding:var(--space-8) var(--space-6);max-width:800px;margin:0 auto;width:100%}.lyrics-line{font-size:18px;line-height:2;color:var(--text-secondary);margin-bottom:var(--space-4);transition:color .2s ease}.lyrics-line:hover{color:var(--text-primary)}.lyrics-empty{text-align:center;padding:var(--space-12);color:var(--text-tertiary)}.lyrics-empty svg{margin-bottom:var(--space-6)}.lyrics-empty h3{font-size:18px;color:var(--text-secondary);margin-bottom:var(--space-2)}.lyrics-editor{width:100%;min-height:400px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-md);padding:var(--space-5);color:var(--text-primary);font-size:16px;line-height:1.8;font-family:inherit;resize:vertical}.lyrics-edit-actions{display:flex;gap:var(--space-3);margin-top:var(--space-5)}.lyrics-save-btn,.lyrics-cancel-btn{flex:1;padding:var(--space-3);border-radius:var(--radius-sm);font-size:14px;font-weight:600;transition:all .2s ease}.lyrics-save-btn{background:var(--primary);color:#000}.lyrics-save-btn:hover{background:var(--primary-dark)}.lyrics-cancel-btn{background:var(--bg-hover);border:1px solid var(--border);color:var(--text-primary)}.lyrics-cancel-btn:hover{background:var(--bg-elevated)}.chords-panel{flex-direction:row}.chords-panel-sidebar{width:280px;background:var(--bg-elevated);border-right:1px solid var(--border);padding:var(--space-6);display:flex;flex-direction:column}.sidebar-track-control{flex:1;display:flex;flex-direction:column;gap:var(--space-4)}.sidebar-track-item{display:flex;flex-direction:column;gap:var(--space-2)}.track-label{display:flex;align-items:center;gap:var(--space-2);font-size:13px;color:var(--text-secondary)}.track-mute-btn,.track-solo-btn{width:24px;height:24px;border-radius:4px;background:var(--bg-hover);border:1px solid var(--border);font-size:11px;font-weight:700;color:var(--text-tertiary);transition:all .2s ease}.track-mute-btn:hover,.track-solo-btn:hover{background:#ffd7001a;color:gold}.track-solo-btn.active{background:gold;color:#000;border-color:gold}.track-volume-slider{width:100%}.sidebar-reset-btn{padding:var(--space-3);background:var(--bg-hover);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-primary);font-size:13px;font-weight:600;margin-top:var(--space-4)}.chords-panel-main{flex:1;display:flex;flex-direction:column;overflow:hidden}.chords-panel-header{padding:var(--space-5) var(--space-6);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}.chords-difficulty-selector{display:flex;gap:var(--space-2)}.difficulty-btn{padding:var(--space-2) var(--space-4);background:var(--bg-hover);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-secondary);font-size:13px;font-weight:600;transition:all .2s ease}.difficulty-btn:hover{background:var(--bg-elevated);color:var(--text-primary)}.difficulty-btn.active{background:var(--primary);border-color:var(--primary);color:#000}.chords-panel-content{flex:1;overflow-y:auto;padding:var(--space-8)}.chord-diagrams-row{display:flex;gap:var(--space-6);margin-bottom:var(--space-6);flex-wrap:wrap}.chord-diagrams-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:var(--space-6)}.chord-diagram{display:flex;flex-direction:column;align-items:center;gap:var(--space-3)}.chord-fretboard{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-md);padding:var(--space-4)}.chord-name{font-size:16px;font-weight:700;color:var(--text-primary)}.lyrics-line-with-chords{font-size:16px;line-height:2;color:var(--text-secondary);margin-bottom:var(--space-5)}.chords-empty{text-align:center;padding:var(--space-12);color:var(--text-tertiary)}.split-drawer-panel{position:fixed;top:0;right:0;bottom:0;width:360px;background:var(--bg-elevated);border-left:1px solid var(--border);box-shadow:-4px 0 24px #0006;z-index:9999;transform:translate(100%);transition:transform .3s ease;display:flex;flex-direction:column}.split-drawer-panel.active{transform:translate(0)}.sections-panel-header{padding:var(--space-5) var(--space-6);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}.sections-panel-header h2{font-size:18px;font-weight:600;color:var(--text-primary)}.sections-panel-close{width:28px;height:28px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;color:var(--text-secondary);transition:all .2s ease}.sections-panel-close:hover{background:var(--bg-hover);color:var(--text-primary)}.sections-panel-content{flex:1;overflow-y:auto;padding:var(--space-5)}.sections-loading,.sections-empty{text-align:center;padding:var(--space-12) var(--space-6);color:var(--text-tertiary)}.sections-loading-icon{margin-bottom:var(--space-5)}.sections-loading-text{font-size:16px;font-weight:600;color:var(--text-secondary);margin-bottom:var(--space-2)}.sections-loading-subtext{font-size:13px}.sections-analyze-btn{margin-top:var(--space-5);padding:var(--space-3) var(--space-5);background:var(--primary);color:#000;border-radius:var(--radius-sm);font-size:14px;font-weight:600}.sections-list{display:flex;flex-direction:column;gap:var(--space-2)}.section-item{padding:var(--space-4);background:var(--bg-base);border:1px solid var(--border);border-radius:var(--radius-md);display:flex;align-items:center;gap:var(--space-3);cursor:pointer;transition:all .2s ease}.section-item:hover{background:var(--bg-hover);border-color:var(--border-strong)}.section-icon{font-size:24px}.section-info{flex:1}.section-name{font-size:14px;font-weight:600;color:var(--text-primary);margin-bottom:var(--space-1)}.section-time{font-size:12px;color:var(--text-tertiary)}.section-duration{font-size:13px;color:var(--text-secondary);font-variant-numeric:tabular-nums}.sections-panel-footer{padding:var(--space-4);border-top:1px solid var(--border);display:flex;gap:var(--space-2)}.sections-footer-btn{flex:1;padding:var(--space-3);background:var(--bg-hover);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-secondary);font-size:13px;font-weight:600;display:flex;align-items:center;justify-content:center;gap:var(--space-2);transition:all .2s ease}.sections-footer-btn:hover{background:var(--bg-elevated);color:var(--text-primary)}.sections-footer-btn.active{background:var(--primary);border-color:var(--primary);color:#000}.yt-pan-knob{width:22px;height:22px;border-radius:50%;cursor:pointer;position:relative;background:radial-gradient(circle at 35% 30%,#4a4a4a,#1a1a1a);border:1px solid #555;box-shadow:0 2px 4px #00000080,inset 0 1px #ffffff1a}.yt-pan-knob:hover{border-color:#06b6d4;box-shadow:0 0 6px #06b6d466}.yt-pan-indicator{position:absolute;width:2px;height:7px;background:#06b6d4;top:2px;left:50%;transform:translate(-50%);border-radius:1px;transform-origin:center 9px}.split-engine-selector{background:#ffffff08;border:1px solid rgba(255,255,255,.06);border-radius:12px;padding:20px;margin:20px 0}.split-engine-title{font-size:12px;color:#ffffff80;margin:0 0 14px;text-transform:uppercase;letter-spacing:1.2px;font-weight:600}.split-engine-options{display:flex;gap:12px;margin-bottom:14px}.split-engine-option{flex:1;cursor:pointer;background:#ffffff0a;border:2px solid rgba(255,255,255,.06);border-radius:10px;padding:14px 16px;transition:all .2s ease;display:flex;align-items:flex-start;gap:12px}.split-engine-option:hover{background:#ffffff0f;border-color:#06b6d44d}.split-engine-option.active{border-color:#06b6d4;background:#06b6d414;box-shadow:0 0 0 1px #06b6d44d}.split-engine-option input[type=radio]{margin:4px 0 0;accent-color:#06B6D4;flex-shrink:0}.split-engine-content{flex:1}.split-engine-name{color:#fff;font-weight:600;font-size:14px;display:flex;align-items:center;gap:8px}.split-engine-badge{display:inline-block;background:linear-gradient(135deg,#06b6d4,#0891b2);color:#fff;font-size:9px;padding:2px 7px;border-radius:4px;font-weight:700;letter-spacing:.5px;box-shadow:0 0 8px #06b6d466}.split-engine-desc{color:#ffffff8c;font-size:12px;margin-top:4px}.split-engine-meta{display:flex;gap:10px;margin-top:6px;font-size:11px}.split-engine-tokens{color:#06b6d4;font-weight:600}.split-engine-uses{color:#fff6}.split-engine-info{font-size:12px;color:#ffffff80;line-height:1.5;padding-top:12px;border-top:1px solid rgba(255,255,255,.06)}.split-stem-btn.disabled{opacity:.35;pointer-events:none;cursor:not-allowed}@media (max-width: 640px){.split-engine-options{flex-direction:column}.split-engine-selector{padding:16px}}