/* ============================================================
   FOUR-TRACK STUDIO — modern, clean UI
   ============================================================ */

:root{
  --bg:#0e1116;
  --bg-grad:radial-gradient(1200px 600px at 50% -10%, #1a2030 0%, #0e1116 60%);
  --panel:#161b22;
  --panel-2:#1c232e;
  --panel-3:#222b38;
  --panel-soft:#1a2029;
  --stroke:#2a3340;
  --stroke-soft:#232b36;
  --text:#e6edf3;
  --text-dim:#8b949e;
  --text-faint:#5d6673;
  --accent:#4d8dff;
  --accent-soft:rgba(77,141,255,.14);
  --accent-2:#7ee787;
  --warn:#f0883e;
  --danger:#ff5c5c;
  --rec:#ff4d4d;
  --shadow:0 8px 28px rgba(0,0,0,.45);
  --shadow-sm:0 2px 8px rgba(0,0,0,.35);
  --radius:14px;
  --radius-sm:9px;
  --radius-xs:6px;
  --mono:'SF Mono', ui-monospace, 'Cascadia Code', 'JetBrains Mono', Menlo, Consolas, monospace;
  --sans:'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

*{box-sizing:border-box; margin:0; padding:0;}

html,body{
  height:100%;
  font-family:var(--sans);
  color:var(--text);
  background:var(--bg);
  background-image:var(--bg-grad);
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow:auto;
}

button{ font-family:inherit; cursor:pointer; }
input{ font-family:inherit; }

/* ====== MACHINE FRAME ====== */
.machine{
  max-width:1320px;
  margin:0 auto;
  padding:22px 22px 40px;
  display:flex;
  flex-direction:column;
  gap:14px;
}

/* ====== BRAND PLATE ====== */
.brandplate{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  padding:20px 28px;
  background:linear-gradient(180deg, var(--panel-2), var(--panel));
  border:1px solid var(--stroke);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}
.brand-center{ text-align:center; }
.brand-eyebrow{
  font:600 10px/1 var(--sans);
  letter-spacing:.32em;
  color:var(--text-faint);
  text-transform:uppercase;
}
.brand-name{
  font:700 30px/1.1 var(--sans);
  letter-spacing:-.02em;
  margin:6px 0 4px;
  color:var(--text);
}
.brand-name .amp{ color:var(--accent); font-size:.8em; margin:0 4px; }
.brand-sub{
  font:500 10px/1 var(--mono);
  letter-spacing:.18em;
  color:var(--text-faint);
}

/* ====== REELS (modern, minimal) ====== */
.reel{
  width:58px; height:58px; border-radius:50%;
  background:radial-gradient(circle at 50% 50%, var(--panel-3), var(--panel));
  border:1px solid var(--stroke);
  position:relative;
  flex:0 0 auto;
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.03), var(--shadow-sm);
}
.reel-left,.reel-right{ display:block; }
.reel-hub{
  position:absolute; inset:42%;
  border-radius:50%;
  background:var(--accent);
  box-shadow:0 0 10px var(--accent-soft);
}
.reel-spoke{
  position:absolute; left:50%; top:50%;
  width:2px; height:46%;
  margin-left:-1px; margin-top:-46%;
  background:var(--stroke);
  transform-origin:50% 100%;
}
.reel-spoke:nth-child(2){transform:rotate(0deg);}
.reel-spoke:nth-child(3){transform:rotate(60deg);}
.reel-spoke:nth-child(4){transform:rotate(120deg);}
.reel-spoke:nth-child(5){transform:rotate(180deg);}
.reel-spoke:nth-child(6){transform:rotate(240deg);}
.reel-spoke:nth-child(7){transform:rotate(300deg);}
.reel.spinning .reel-spoke{ animation:spin 1.4s linear infinite; }
@keyframes spin{ to{ transform:rotate(360deg);} }
/* spinning override per spoke: animate the whole reel instead */
.reel.spinning{ animation:spin 1.4s linear infinite; }
.reel.spinning .reel-spoke{ animation:none; }

/* ====== METER BRIDGE ====== */
.meterbridge{
  display:grid;
  grid-template-columns: 220px 1fr 320px;
  gap:14px;
  align-items:stretch;
}
@media (max-width:980px){
  .meterbridge{ grid-template-columns:1fr; }
}

.meters-wrap,
.controls-panel,
.transport{
  background:linear-gradient(180deg, var(--panel-2), var(--panel));
  border:1px solid var(--stroke);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  padding:16px 18px;
}

.meter-label{
  font:600 10px/1 var(--sans);
  letter-spacing:.22em;
  color:var(--text-faint);
  margin-bottom:10px;
  text-transform:uppercase;
}

/* VU meters */
.vu-meter{
  position:relative;
  display:inline-block;
  width:34px; height:120px;
  margin-right:10px;
  background:var(--panel-soft);
  border:1px solid var(--stroke-soft);
  border-radius:var(--radius-xs);
  vertical-align:bottom;
}
.vu-track{
  position:absolute; left:0; right:0; bottom:0; height:100%;
  overflow:hidden; border-radius:var(--radius-xs); pointer-events:none;
}
.vu-needle{
  position:absolute; bottom:0; left:0; right:0; height:0%;
  background:linear-gradient(180deg,
    rgba(255,92,92,.9) 0 12%,
    rgba(240,136,62,.9) 12% 32%,
    rgba(126,231,135,.9) 32% 100%);
  transition:height .05s linear;
  border-radius:0 0 var(--radius-xs) var(--radius-xs);
}
.vu-scale{ position:absolute; top:0; left:100%; margin-left:6px; height:100%; }
.vu-scale span{
  position:absolute; left:0;
  font:500 8px/1 var(--mono);
  color:var(--text-faint);
  transform:translateY(50%);
  white-space:nowrap;
}
.vu-scale span.red{ color:var(--danger); }
.vu-channel{
  margin-top:8px;
  font:600 10px/1 var(--mono);
  letter-spacing:.3em;
  color:var(--text-faint);
}

/* ====== TRANSPORT ====== */
.transport{
  display:flex;
  align-items:center;
  gap:14px;
  flex-wrap:wrap;
}
.tbtn{
  width:46px; height:46px;
  border-radius:12px;
  border:1px solid var(--stroke);
  background:var(--panel-3);
  display:grid; place-items:center;
  transition:transform .12s ease, background .15s ease, border-color .15s ease, box-shadow .15s ease;
  box-shadow:var(--shadow-sm);
}
.tbtn svg{ width:20px; height:20px; fill:var(--text-dim); stroke:var(--text-dim); stroke-width:1.5; transition:fill .15s, stroke .15s; }
.tbtn:hover{ background:#27313f; transform:translateY(-1px); }
.tbtn:hover svg{ fill:var(--text); stroke:var(--text); }
.tbtn:active{ transform:translateY(0); }
.tbtn.rewind svg{ transform:scaleX(-1); }
.tbtn.stop.active{ background:rgba(255,170,60,.18); border-color:rgba(255,170,60,.5); }
.tbtn.stop.active svg{ fill:var(--accent); stroke:var(--accent); }
.tbtn.loop{ }
.tbtn.loop svg{ fill:none; stroke:currentColor; stroke-width:1.8; stroke-linecap:round; stroke-linejoin:round; }
.tbtn.loop.active{ background:rgba(58,174,255,.16); border-color:rgba(58,174,255,.5); color:#5db6ff; }
.tbtn.loop.active svg{ stroke:#5db6ff; }
.tbtn.play.active{
  background:var(--accent); border-color:transparent;
  box-shadow:0 0 0 3px var(--accent-soft), var(--shadow-sm);
}
.tbtn.play.active svg{ fill:#fff; stroke:#fff; }
.tbtn.rec.active{
  background:var(--rec); border-color:transparent;
  box-shadow:0 0 0 3px rgba(255,77,77,.22), var(--shadow-sm);
  animation:pulseRec 1.2s ease-in-out infinite;
}
.tbtn.rec.active svg{ fill:#fff; stroke:#fff; }
@keyframes pulseRec{ 0%,100%{ box-shadow:0 0 0 3px rgba(255,77,77,.22), var(--shadow-sm);} 50%{ box-shadow:0 0 0 6px rgba(255,77,77,.32), var(--shadow-sm);} }

.timecode{
  font:600 22px/1 var(--mono);
  letter-spacing:.04em;
  color:var(--text);
  background:var(--panel-soft);
  border:1px solid var(--stroke-soft);
  border-radius:10px;
  padding:8px 14px;
  margin-left:auto;
  min-width:118px; text-align:center;
}

.rec-lamp{
  font:700 10px/1 var(--sans);
  letter-spacing:.2em;
  padding:6px 10px;
  border-radius:6px;
  background:var(--panel-soft);
  border:1px solid var(--stroke-soft);
  color:var(--text-faint);
  transition:all .2s ease;
}
.rec-lamp.on{
  color:#fff;
  background:var(--rec);
  border-color:transparent;
  box-shadow:0 0 14px rgba(255,77,77,.55);
}

/* ====== CONTROLS PANEL ====== */
.controls-panel{
  display:grid;
  grid-template-columns:repeat(2, 1fr);
  gap:14px 18px;
}
.ctrl-group{ display:flex; flex-direction:column; gap:8px; }
.ctrl-label{
  font:600 10px/1 var(--sans);
  letter-spacing:.2em;
  color:var(--text-faint);
  text-transform:uppercase;
}

.toggle{
  height:34px;
  border-radius:9px;
  border:1px solid var(--stroke);
  background:var(--panel-3);
  color:var(--text-dim);
  font:600 12px/1 var(--sans);
  letter-spacing:.08em;
  transition:all .15s ease;
}
.toggle:hover{ background:#27313f; color:var(--text); }
.toggle.small{ padding:0 12px; }
.toggle[data-on="true"], .toggle.active{
  background:var(--accent); color:#fff; border-color:transparent;
  box-shadow:0 0 0 3px var(--accent-soft);
}

.knob-row{ display:flex; align-items:center; gap:8px; }
.knob-btn{
  width:30px; height:30px; border-radius:8px;
  border:1px solid var(--stroke); background:var(--panel-3);
  color:var(--text); font-size:16px; font-weight:600;
  display:grid; place-items:center;
  transition:background .15s, transform .1s;
}
.knob-btn:hover{ background:#27313f; }
.knob-btn:active{ transform:scale(.92); }
.bpm-val{
  font:600 16px/1 var(--mono);
  color:var(--text);
  min-width:34px; text-align:center;
}

/* sliders */
.slider{
  -webkit-appearance:none; appearance:none;
  width:100%; height:5px; border-radius:5px;
  background:var(--stroke);
  outline:none;
}
.slider::-webkit-slider-thumb{
  -webkit-appearance:none; appearance:none;
  width:16px; height:16px; border-radius:50%;
  background:var(--accent); border:2px solid #fff;
  cursor:pointer; box-shadow:0 2px 6px rgba(0,0,0,.4);
  transition:transform .12s;
}
.slider::-webkit-slider-thumb:hover{ transform:scale(1.15); }
.slider::-moz-range-thumb{
  width:16px; height:16px; border-radius:50%;
  background:var(--accent); border:2px solid #fff; cursor:pointer;
}
.master-slider{ background:var(--stroke); }

/* ====== TRACKS ====== */
.tracks{ display:flex; flex-direction:column; gap:8px; }

.track{
  display:grid;
  grid-template-columns:240px 1fr;
  gap:0;
  background:var(--panel);
  border:1px solid var(--stroke);
  border-radius:var(--radius);
  overflow:hidden;
  box-shadow:var(--shadow-sm);
  transition:border-color .15s ease;
}
.track:hover{ border-color:#303a48; }

.track-controls{
  display:grid;
  grid-template-columns:auto auto 1fr;
  grid-template-rows:auto auto auto;
  gap:6px 10px;
  padding:12px 14px;
  align-items:center;
  border-right:1px solid var(--stroke-soft);
  background:linear-gradient(180deg, var(--panel-2), var(--panel));
}

.track-name{
  grid-column:1 / 4;
  display:flex; align-items:center; gap:10px;
}
.tname{
  font:700 13px/1 var(--sans);
  letter-spacing:.04em;
  color:var(--text);
  cursor:text;
}
.tnum{
  font:600 9px/1 var(--mono);
  letter-spacing:.14em;
  color:var(--text-faint);
  padding:3px 7px;
  background:var(--panel-soft);
  border:1px solid var(--stroke-soft);
  border-radius:5px;
}

.arm-btn{
  grid-column:1 / 2;
  width:30px; height:30px; border-radius:50%;
  border:1px solid var(--stroke);
  background:var(--panel-3);
  color:var(--text-faint);
  font-size:12px;
  display:grid; place-items:center;
  transition:all .15s ease;
}
.arm-btn:hover{ color:var(--text); border-color:var(--rec); }
.arm-btn.armed{
  background:var(--rec); color:#fff; border-color:transparent;
  box-shadow:0 0 0 3px rgba(255,77,77,.22);
  animation:pulseRec 1.4s ease-in-out infinite;
}

.mute-solo{ grid-column:2 / 3; display:flex; gap:5px; }
.ms-btn{
  width:30px; height:26px; border-radius:6px;
  border:1px solid var(--stroke); background:var(--panel-3);
  color:var(--text-dim); font:700 11px/1 var(--sans);
  display:grid; place-items:center;
  transition:all .12s ease;
}
.ms-btn:hover{ color:var(--text); }
.ms-btn.mute.active{
  background:var(--warn); color:#1a1106; border-color:transparent;
}
.ms-btn.solo.active{
  background:var(--accent-2); color:#06140a; border-color:transparent;
}

.pan-wrap{ grid-column:3 / 4; display:flex; flex-direction:column; align-items:center; gap:3px; }
.pan-label{
  font:600 8px/1 var(--sans); letter-spacing:.18em;
  color:var(--text-faint);
}
.pan-knob{
  width:28px; height:28px; border-radius:50%;
  background:radial-gradient(circle at 35% 30%, var(--panel-3), #0c1015);
  border:1px solid var(--stroke);
  position:relative;
  cursor:ns-resize;
  transition:border-color .15s;
}
.pan-knob::after{
  content:''; position:absolute; left:50%; top:3px;
  width:2px; height:9px; margin-left:-1px;
  background:var(--accent); border-radius:2px;
}
.pan-knob:hover{ border-color:var(--accent); }

.vol-wrap{ grid-column:1 / 4; display:flex; flex-direction:column; gap:5px; }
.vol-label{
  font:600 8px/1 var(--sans); letter-spacing:.18em;
  color:var(--text-faint);
}
.vol-slider{
  -webkit-appearance:none; appearance:none;
  width:100%; height:5px; border-radius:5px;
  background:var(--stroke); outline:none;
}
.vol-slider::-webkit-slider-thumb{
  -webkit-appearance:none; appearance:none;
  width:14px; height:14px; border-radius:50%;
  background:var(--text); border:2px solid var(--panel);
  cursor:pointer; box-shadow:0 2px 5px rgba(0,0,0,.4);
}
.vol-slider::-moz-range-thumb{
  width:14px; height:14px; border-radius:50%;
  background:var(--text); border:2px solid var(--panel); cursor:pointer;
}

/* ====== WAVEFORM AREA ====== */
.wf-wrap{
  position:relative;
  height:96px;
  background:
    linear-gradient(180deg, transparent 49.5%, rgba(255,255,255,.04) 49.5% 50.5%, transparent 50.5%),
    var(--panel-soft);
  cursor:text;
}
.wf-canvas{ position:absolute; inset:0; width:100%; height:96px; }
.wf-empty{
  position:absolute; inset:0;
  display:grid; place-items:center;
  font:500 11px/1 var(--mono);
  letter-spacing:.1em;
  color:var(--text-faint);
  pointer-events:none;
}
.wf-playhead{
  position:absolute; top:0; bottom:0; width:2px;
  background:rgba(255,255,255,.7);
  opacity:0; pointer-events:none;
  box-shadow:0 0 8px rgba(255,255,255,.4);
}
.wf-clip{
  position:absolute; top:0; bottom:0;
  border-left:1px solid rgba(255,255,255,.18);
}
.wf-clip-head{
  position:absolute; top:0; left:0; right:0; height:12px;
  background:linear-gradient(180deg, rgba(255,255,255,.10), transparent);
  cursor:grab;
}
.wf-clip-head:active{ cursor:grabbing; }

/* ====== TIMELINE ====== */
.timeline-wrap{
  background:var(--panel);
  border:1px solid var(--stroke);
  border-radius:var(--radius);
  box-shadow:var(--shadow-sm);
  overflow:hidden;
}
.timeline-ruler{
  position:relative;
  height:30px;
  background:var(--panel-soft);
  border-bottom:1px solid var(--stroke-soft);
}
.ruler-tick{
  position:absolute; top:0; bottom:0;
  width:1px; background:var(--stroke);
  opacity:.5;
}
.ruler-tick.major{ opacity:.8; }
.ruler-tick.major span{
  position:absolute; left:5px; top:9px;
  font:500 9px/1 var(--mono);
  color:var(--text-faint);
  white-space:nowrap;
}
.timeline-body{
  position:relative;
  height:30px;
  background:repeating-linear-gradient(90deg, var(--panel) 0, var(--panel) 99px, var(--stroke-soft) 99px, var(--stroke-soft) 100px);
  cursor:pointer;
}
/* loop region overlay */
.loop-region{
  position:absolute; top:0; bottom:0;
  left:0; width:0;
  background:linear-gradient(90deg, rgba(58,174,255,.16), rgba(58,174,255,.10));
  border-left:2px solid rgba(58,174,255,.7);
  border-right:2px solid rgba(58,174,255,.7);
  z-index:4; cursor:grab;
  display:none;
}
.loop-region.active{ display:block; }
.loop-region.dragging{ cursor:grabbing; }
.loop-handle{
  position:absolute; top:-2px; bottom:-2px; width:8px;
  background:#3aaeff;
  border-radius:2px;
  cursor:ew-resize;
  box-shadow:0 0 6px rgba(58,174,255,.6);
  z-index:6;
}
.loop-left{ left:-4px; }
.loop-right{ right:-4px; }
.loop-handle::after{
  content:''; position:absolute; top:50%; left:50%;
  transform:translate(-50%,-50%);
  width:2px; height:8px; background:rgba(255,255,255,.7);
}
/* per-track loop overlay inside each waveform lane */
.wf-loop{
  position:absolute; top:0; bottom:0;
  left:0; width:0;
  background:rgba(58,174,255,.10);
  border-left:1px solid rgba(58,174,255,.5);
  border-right:1px solid rgba(58,174,255,.5);
  pointer-events:none;
  display:none; z-index:2;
}
.wf-loop.active{ display:block; }
.playhead{
  position:absolute; top:-30px; bottom:0; width:2px;
  background:var(--accent);
  pointer-events:none;
  box-shadow:0 0 10px var(--accent-soft);
  z-index:5;
}
.playhead::before{
  content:''; position:absolute; top:-1px; left:-5px;
  width:12px; height:12px; border-radius:2px;
  background:var(--accent);
  transform:rotate(45deg);
}

/* ====== HELP / STATUS ====== */
.helpbar{
  display:flex; align-items:center; justify-content:space-between; gap:16px;
  padding:12px 18px;
  background:var(--panel);
  border:1px solid var(--stroke);
  border-radius:var(--radius);
  font:400 12px/1.5 var(--sans);
  color:var(--text-dim);
  flex-wrap:wrap;
}
.helpbar b{ color:var(--text); font-weight:600; }

.status{
  font:600 11px/1 var(--mono);
  letter-spacing:.14em;
  padding:6px 12px;
  border-radius:6px;
  background:var(--panel-soft);
  border:1px solid var(--stroke-soft);
  color:var(--text-dim);
  white-space:nowrap;
}
.status.busy{ color:var(--accent); border-color:var(--accent-soft); }
.status.rec{ color:var(--rec); border-color:rgba(255,77,77,.3); }

/* ====== SCROLLBAR ====== */
::-webkit-scrollbar{ width:10px; height:10px; }
::-webkit-scrollbar-track{ background:transparent; }
::-webkit-scrollbar-thumb{ background:var(--stroke); border-radius:10px; border:2px solid var(--bg); }
::-webkit-scrollbar-thumb:hover{ background:#3a4654; }