*{box-sizing:border-box}

:root{
  --bg:#07080a;
  --panel:#0d1014;
  --panel-2:#0a0c10;
  --line:rgba(255,255,255,.07);
  --line-2:rgba(255,255,255,.14);
  --text:#edf2f7;
  --muted:#7e8794;
  --soft:#596473;
  --accent:#79d8ff;
  --accent-soft:rgba(121,216,255,.08);
}

html,body{
  margin:0;
  min-height:100%;
  background:var(--bg);
  color:var(--text);
  font-family:"Segoe UI Variable","Segoe UI",Arial,sans-serif;
}

button,input,label{font:inherit}
button{color:inherit}
input[type="range"]{width:100%;accent-color:var(--accent)}

.app{
  min-height:100vh;
  display:grid;
  grid-template-columns:190px minmax(0,1fr);
}

.sidebar{
  min-height:100vh;
  padding:22px 16px;
  border-right:1px solid var(--line);
  background:#090a0d;
  display:flex;
  flex-direction:column;
  gap:28px;
}

.brand{
  display:flex;
  align-items:center;
  gap:11px;
}

.brand-mark{
  width:40px;
  height:40px;
  display:grid;
  place-items:center;
  border:1px solid var(--line-2);
  font-size:11px;
  letter-spacing:.14em;
  font-weight:700;
}

.brand strong{
  display:block;
  font-size:12px;
  letter-spacing:.15em;
  font-weight:600;
}

.brand small{
  display:block;
  margin-top:3px;
  color:var(--muted);
  font-size:11px;
}

.label{
  color:var(--accent);
  font-size:9px;
  letter-spacing:.18em;
}

.side-block{
  display:grid;
  gap:7px;
}

.file-button,
.visual-mode,
.side-actions button,
.wave-mode,
.edit-tools button,
.transport button,
.pair-buttons button{
  border:1px solid var(--line);
  background:transparent;
  cursor:pointer;
  transition:.15s ease;
}

.file-button{
  padding:10px 11px;
  text-align:center;
  font-size:12px;
}

#audioFile{display:none}

.visual-mode{
  text-align:left;
  padding:8px 10px;
  color:#8893a1;
  font-size:12px;
}

.visual-mode:hover,
.visual-mode.active,
.wave-mode:hover,
.wave-mode.active,
.edit-tools button:hover:not(:disabled),
.side-actions button:hover,
.transport button:hover:not(:disabled),
.pair-buttons button:hover:not(:disabled),
.file-button:hover{
  color:#f0f6fa;
  border-color:rgba(121,216,255,.28);
  background:rgba(121,216,255,.04);
}

.visual-mode.active,
.wave-mode.active{
  background:var(--accent-soft);
}

.side-actions{
  gap:6px;
}

.side-actions button{
  padding:9px;
  font-size:11px;
}

.side-foot{
  margin-top:auto;
  padding-top:14px;
  border-top:1px solid var(--line);
  color:var(--soft);
  font-size:10px;
}

.side-foot small{
  display:block;
  margin-top:3px;
}

.workspace{
  width:100%;
  max-width:1600px;
  margin:auto;
  padding:22px 26px 28px;
}

.topbar{
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  gap:20px;
  padding-bottom:16px;
  border-bottom:1px solid var(--line);
}

.track-title h1{
  margin:7px 0 0;
  font-size:clamp(20px,2.1vw,29px);
  font-weight:300;
  letter-spacing:-.02em;
}

.meta{
  display:flex;
  gap:14px;
  flex-wrap:wrap;
  justify-content:flex-end;
}

.meta div{
  min-width:90px;
  padding-left:10px;
  border-left:1px solid var(--line);
}

.meta span,
.control-head span{
  display:block;
  color:var(--soft);
  font-size:9px;
  letter-spacing:.14em;
}

.meta strong,
.control-head strong{
  display:block;
  margin-top:4px;
  font-size:12px;
  font-weight:600;
}

.visual-panel,
.wave-panel{
  margin-top:16px;
}

.visual-panel{
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  background:#040507;
}

.panel-head{
  height:40px;
  padding:0 2px;
  display:flex;
  justify-content:space-between;
  align-items:center;
}

.panel-head>div{
  display:flex;
  align-items:center;
  gap:10px;
}

.panel-head strong{
  font-size:11px;
  letter-spacing:.12em;
  font-weight:500;
  color:#d2dbe4;
}

.panel-head>span{
  color:rgba(255,255,255,.28);
  font-size:9px;
  letter-spacing:.12em;
}

.gpu-wrap{
  position:relative;
  height:430px;
  overflow:hidden;
  background:#030408;
}
#shaderCanvas,#visualCanvas{
  position:absolute;
  inset:0;
  display:block;
  width:100%;
  height:100%;
}
#shaderCanvas{z-index:1;}
#visualCanvas{z-index:2;pointer-events:none;}
.gpu-badge{
  position:absolute;
  right:12px;
  bottom:10px;
  z-index:3;
  padding:5px 8px;
  border:1px solid rgba(121,216,255,.12);
  background:rgba(4,6,10,.44);
  color:rgba(180,228,248,.42);
  font-size:8px;
  letter-spacing:.16em;
  pointer-events:none;
}

.wave-panel{
  border-top:1px solid var(--line);
}

.wave-toolbar{
  padding:10px 0;
  display:flex;
  justify-content:space-between;
  gap:12px;
  flex-wrap:wrap;
}

.wave-modes,
.edit-tools{
  display:flex;
  gap:6px;
  flex-wrap:wrap;
}

.wave-mode,
.edit-tools button{
  height:32px;
  padding:0 10px;
  font-size:11px;
}

.edit-tools button:disabled,
.transport button:disabled,
.pair-buttons button:disabled{
  opacity:.32;
  cursor:default;
}

.selection-info{
  min-height:24px;
  padding-bottom:6px;
  color:var(--muted);
  font-size:10px;
}

.wave-scroll{
  overflow-x:auto;
  overflow-y:hidden;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  background:var(--panel);
}

.wave-inner{
  position:relative;
  min-width:100%;
  height:245px;
}

#waveform{
  display:block;
  width:100%;
  height:100%;
  cursor:pointer;
}

.empty-state{
  position:absolute;
  inset:0;
  display:grid;
  place-content:center;
  text-align:center;
  pointer-events:none;
}

.empty-state strong{
  font-size:16px;
  font-weight:300;
}

.empty-state span{
  margin-top:5px;
  color:var(--muted);
  font-size:11px;
}

.playhead{
  position:absolute;
  top:0;
  bottom:0;
  width:1px;
  left:0;
  background:var(--accent);
  box-shadow:0 0 10px rgba(121,216,255,.28);
  opacity:0;
  z-index:4;
  pointer-events:none;
}

.selection-fill{
  position:absolute;
  top:0;
  bottom:0;
  display:none;
  background:rgba(121,216,255,.07);
  z-index:2;
  pointer-events:none;
}

.marker{
  position:absolute;
  top:0;
  bottom:0;
  width:1px;
  display:none;
  background:rgba(121,216,255,.68);
  z-index:3;
  pointer-events:none;
}

.marker::after{
  content:"";
  position:absolute;
  top:8px;
  left:-3px;
  width:7px;
  height:7px;
  border-radius:50%;
  background:var(--accent);
}

.marker-end{
  background:rgba(255,255,255,.36);
}

.marker-end::after{
  background:#fff;
}

.seek-row{
  display:grid;
  grid-template-columns:70px minmax(0,1fr) 70px;
  gap:10px;
  align-items:center;
  padding-top:9px;
  color:var(--muted);
  font-size:10px;
}

.seek-row span:last-child{text-align:right}

.transport{
  display:flex;
  justify-content:center;
  gap:7px;
  padding:12px 0 4px;
}

.transport button{
  min-width:72px;
  height:38px;
  font-size:11px;
}

.transport .play{
  min-width:120px;
  background:var(--accent-soft);
  border-color:rgba(121,216,255,.28);
  font-weight:700;
  letter-spacing:.14em;
}

.controls{
  margin-top:18px;
  display:grid;
  grid-template-columns:minmax(0,1.7fr) minmax(280px,.8fr);
  gap:18px;
}

.control-group{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:10px 14px;
}

.visual-controls{
  grid-template-columns:1fr 1fr;
}

.control{
  padding-top:11px;
  border-top:1px solid var(--line);
  min-width:0;
}

.control-head{
  display:flex;
  justify-content:space-between;
  margin-bottom:9px;
}

.pair-buttons{
  display:flex;
  gap:6px;
}

.pair-buttons button{
  flex:1;
  height:32px;
  font-size:10px;
}

@media(max-width:1200px){
  .controls{
    grid-template-columns:1fr;
  }

  .control-group{
    grid-template-columns:repeat(4,minmax(0,1fr));
  }

  .visual-controls{
    grid-template-columns:repeat(4,minmax(0,1fr));
  }
}

@media(max-width:900px){
  .app{grid-template-columns:1fr}
  .sidebar{
    min-height:auto;
    border-right:0;
    border-bottom:1px solid var(--line);
  }
  .topbar{flex-direction:column}
  .meta{justify-content:flex-start}
  .control-group,
  .visual-controls{
    grid-template-columns:1fr 1fr;
  }
}

@media(max-width:620px){
  .workspace{padding:16px 12px 24px}
  .meta{display:grid;grid-template-columns:1fr 1fr;width:100%}
  .control-group,
  .visual-controls{
    grid-template-columns:1fr;
  }
  #visualCanvas{height:260px}
  .wave-inner{height:210px}
}


/* v1.0 tweaks */
.sidebar{gap:22px;}
.side-block:nth-of-type(2){max-height:420px;overflow:auto;padding-right:2px;}
.side-block:nth-of-type(2)::-webkit-scrollbar{width:6px;}
.side-block:nth-of-type(2)::-webkit-scrollbar-thumb{background:rgba(255,255,255,.08);}
.visual-mode{font-size:11px;line-height:1.25;}


/* v1.2 stability / visual polish */
.track-title{min-width:0;max-width:min(720px,58vw)}
.track-title h1{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.visual-panel{box-shadow:inset 0 0 80px rgba(0,0,0,.28)}
#visualCanvas{min-height:360px}
.wave-inner.live-wave #waveform{filter:drop-shadow(0 0 7px rgba(121,216,255,.18))}
.wave-status-note{color:#6f7b89;font-size:10px;letter-spacing:.05em}
@media(max-width:900px){.track-title{max-width:100%}.track-title h1{white-space:normal}}

/* v1.3 performance */
.visual-controls{grid-template-columns:repeat(5,minmax(0,1fr));}
#visualCanvas{image-rendering:auto;}
@media(max-width:1200px){.visual-controls{grid-template-columns:repeat(3,minmax(0,1fr));}}
@media(max-width:700px){.visual-controls{grid-template-columns:1fr 1fr;}}


/* v1.5 - follow waveform, visual untouched */
.wave-stage{
  position:relative;
  overflow:hidden;
}
.wave-scroll{
  overflow:hidden!important;
  position:relative;
}
.wave-inner{
  will-change:transform;
  transform:translateX(0);
}
.playhead{
  left:50%!important;
  top:0!important;
  bottom:0!important;
  transform:translateX(-.5px);
  z-index:20!important;
  opacity:0;
  background:#79d8ff!important;
  box-shadow:0 0 12px rgba(121,216,255,.42)!important;
}
.wave-inner.live-wave{
  width:100%!important;
}


/* v1.6 beat-engine indicator */
.beat-meta strong{transition:color .08s ease,text-shadow .08s ease}
.beat-meta.beat-hit strong{color:#fff;text-shadow:0 0 12px rgba(121,216,255,.9)}
.beat-meta.beat-mid strong{color:#bfc9ff}
.beat-meta.beat-high strong{color:#ffd1f6}

/* v2.0 GPU */
.visual-panel{position:relative;box-shadow:inset 0 0 90px rgba(0,0,0,.35)}
.side-block:nth-of-type(2){max-height:520px;overflow:auto;padding-right:2px}
.side-block:nth-of-type(2)::-webkit-scrollbar{width:5px}
.side-block:nth-of-type(2)::-webkit-scrollbar-thumb{background:rgba(255,255,255,.08)}
.track-title h1{max-width:720px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
@media(max-width:620px){.gpu-wrap{height:300px!important}}
#shaderCanvas,#visualCanvas{height:100%!important;min-height:0!important;max-height:none!important}