/* ============================================================
   VOLTLINE — instrument panel
   Tactile hardware styling: brushed-metal faceplates, knurled
   rotary knobs, inset jack wells, warm signal LEDs, key bed.
   ============================================================ */

/* ---------- Rack chassis ---------- */
.rig{
  margin-top:3rem;
  border:1px solid var(--hairline-strong);
  background:
    linear-gradient(180deg,rgba(255,255,255,.03),transparent 14%),
    repeating-linear-gradient(90deg,rgba(255,255,255,.012) 0 2px,transparent 2px 5px),
    linear-gradient(180deg,var(--panel-hi),var(--panel) 30%,var(--panel-lo));
  box-shadow:inset 0 1px 0 rgba(255,255,255,.06), 0 30px 70px -35px #000;
  padding:1.1rem;
  position:relative;
}
.rig::before,.rig::after{ /* rack screws */
  content:"";position:absolute;top:.55rem;width:.7rem;height:.7rem;border-radius:50%;
  background:radial-gradient(circle at 35% 30%,#3a443c,#141815 70%);
  box-shadow:inset 0 0 0 1px rgba(0,0,0,.7), 0 1px 0 rgba(255,255,255,.05);
}
.rig::before{left:.55rem}
.rig::after{right:.55rem}
.rig-head{
  display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap;
  border-bottom:1px solid var(--hairline);
  padding:.15rem .5rem .8rem 2.2rem;
}
.rig-model{
  font-family:var(--mono);font-size:.66rem;letter-spacing:.24em;text-transform:uppercase;
  color:var(--text-faint);display:flex;align-items:center;gap:.8rem;
}
.rig-model b{color:var(--accent);font-weight:600;letter-spacing:.24em}
.rig-status{display:flex;align-items:center;gap:1.1rem;font-family:var(--mono);font-size:.64rem;letter-spacing:.14em;color:var(--text-faint)}
.led{width:.55rem;height:.55rem;border-radius:50%;background:#222823;box-shadow:inset 0 0 0 1px rgba(0,0,0,.8)}
.led.warm{background:var(--warm);box-shadow:0 0 8px var(--warm-glow),inset 0 0 0 1px rgba(0,0,0,.4)}
.led.volt{background:var(--accent);box-shadow:0 0 8px var(--accent-glow),inset 0 0 0 1px rgba(0,0,0,.4)}
.led.red{background:var(--red);box-shadow:0 0 8px rgba(255,93,77,.5)}
.led.blink{animation:ledblink .5s steps(2,start) infinite}
@keyframes ledblink{to{opacity:.35}}

/* ---------- Panel grid layout ---------- */
.panel-grid{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1.15fr) minmax(0,1fr);
  gap:1px;background:var(--hairline);
  border:1px solid var(--hairline);
  margin-top:1rem;
}
.module{
  background:linear-gradient(180deg,var(--panel-hi),var(--panel));
  padding:1rem .9rem 1.1rem;
  display:flex;flex-direction:column;gap:.85rem;
  min-width:0;
}
.module-title{
  font-family:var(--mono);font-size:.62rem;letter-spacing:.22em;text-transform:uppercase;
  color:var(--text-muted);margin:0;display:flex;justify-content:space-between;align-items:baseline;gap:.5rem;
}
.module-title span{color:var(--text-faint);letter-spacing:.1em}

@media(max-width:980px){
  .panel-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .module.span-2{grid-column:span 2}
}
@media(max-width:640px){
  .panel-grid{grid-template-columns:1fr}
  .module.span-2{grid-column:auto}
}

/* ---------- Knobs ---------- */
.knob-row{display:flex;gap:1.1rem;flex-wrap:wrap;justify-content:space-around}
.knob{
  --val:0;            /* 0..1 */
  width:4.4rem;flex:none;text-align:center;position:relative;
}
.knob-dial{
  width:3.2rem;height:3.2rem;margin:0 auto;
  border-radius:50%;
  border:1px solid var(--hairline-strong);
  background:
    conic-gradient(from calc(-135deg + var(--ang,0deg)), transparent 0 0),
    repeating-conic-gradient(#262e28 0deg 4deg, #1b211d 4deg 8deg),
    radial-gradient(circle at 38% 32%, #303a33, #171d19 70%);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.08), 0 4px 10px -4px #000;
  position:relative;cursor:ns-resize;
  transition:border-color var(--fast) var(--ease);
}
.knob-dial:hover{border-color:var(--accent)}
.knob-dial:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.knob-dial::before{ /* pointer line */
  content:"";position:absolute;left:50%;top:50%;
  width:2px;height:44%;
  background:var(--accent);
  transform-origin:50% 100%;
  transform:translate(-50%,-100%) rotate(var(--needle,0deg));
  box-shadow:0 0 6px var(--accent-glow);
  border-radius:1px;
}
.knob-name{
  font-family:var(--mono);font-size:.58rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--text-muted);margin:.5rem 0 .1rem;
}
.knob-val{font-family:var(--mono);font-size:.66rem;color:var(--accent)}
.knob-arc{position:absolute;inset:0;pointer-events:none}

/* ---------- Switches / selectors ---------- */
.seg{display:inline-flex;border:1px solid var(--hairline-strong);background:var(--panel-lo)}
.seg button{
  font-family:var(--mono);font-size:.62rem;letter-spacing:.12em;text-transform:uppercase;
  padding:.5rem .7rem;border:0;background:none;color:var(--text-muted);
  border-right:1px solid var(--hairline);
  display:flex;align-items:center;gap:.4rem;
  transition:color var(--fast) var(--ease),background var(--fast) var(--ease);
}
.seg button:last-child{border-right:0}
.seg button svg{width:.95rem;height:.95rem}
.seg button:hover{color:var(--text)}
.seg button[aria-pressed="true"]{background:var(--accent-dim);color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}

.toggle{
  display:inline-flex;align-items:center;gap:.6rem;
  font-family:var(--mono);font-size:.62rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--text-muted);background:none;border:1px solid var(--hairline-strong);
  padding:.45rem .7rem;transition:color var(--fast) var(--ease),border-color var(--fast) var(--ease);
}
.toggle .led{flex:none}
.toggle:hover{color:var(--text)}
.toggle[aria-pressed="true"]{color:var(--accent);border-color:var(--accent)}
.toggle.danger[aria-pressed="true"]{color:var(--red);border-color:var(--red)}

/* ---------- Scope ---------- */
.scope-well{
  border:1px solid var(--hairline-strong);
  background:radial-gradient(ellipse at center,#0d130e 0%,#070a08 100%);
  box-shadow:inset 0 0 30px rgba(0,0,0,.9), inset 0 0 0 1px rgba(0,0,0,.6);
  position:relative;padding:.4rem;
}
.scope-well canvas{width:100%;height:120px;display:block}
.scope-well::after{ /* glass reflection */
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(115deg,rgba(255,255,255,.05) 0 18%,transparent 30%);
}
.scope-tag{
  position:absolute;top:.6rem;left:.8rem;z-index:2;
  font-family:var(--mono);font-size:.56rem;letter-spacing:.2em;text-transform:uppercase;color:var(--text-faint);
}
.scope-hz{
  position:absolute;top:.6rem;right:.8rem;z-index:2;
  font-family:var(--mono);font-size:.56rem;letter-spacing:.14em;color:var(--accent);
}

/* ---------- Presets browser ---------- */
.preset-list{
  list-style:none;margin:0;padding:0;max-height:9.2rem;overflow:auto;
  border:1px solid var(--hairline);background:var(--panel-lo);
}
.preset-list li{border-bottom:1px solid var(--hairline)}
.preset-list li:last-child{border-bottom:0}
.preset-btn{
  width:100%;display:flex;justify-content:space-between;align-items:center;gap:.6rem;
  background:none;border:0;padding:.5rem .7rem;text-align:left;
  font-family:var(--mono);font-size:.68rem;letter-spacing:.08em;color:var(--text-muted);
  transition:background var(--fast) var(--ease),color var(--fast) var(--ease);
}
.preset-btn small{color:var(--text-faint);letter-spacing:.04em}
.preset-btn:hover{background:var(--accent-dim);color:var(--text)}
.preset-btn[aria-pressed="true"]{color:var(--accent);background:var(--accent-dim);box-shadow:inset 2px 0 0 var(--accent)}
.preset-name-row{display:flex;gap:.5rem;align-items:center}
.preset-name-row input[type="text"]{
  flex:1;min-width:0;background:var(--panel-lo);color:var(--text);
  border:1px solid var(--hairline-strong);padding:.5rem .7rem;
  font-family:var(--mono);font-size:.72rem;letter-spacing:.06em;
}
.preset-name-row input[type="text"]:focus-visible{outline:2px solid var(--accent);outline-offset:1px}
.preset-name-row .btn{font-size:.68rem;padding:.45rem .8rem;letter-spacing:.08em;font-family:var(--mono);text-transform:uppercase}
.preset-actions{display:flex;gap:.5rem;flex-wrap:wrap}
.preset-actions .btn{font-size:.68rem;padding:.45rem .7rem;letter-spacing:.08em;font-family:var(--mono);text-transform:uppercase}
.file-input{position:absolute;width:1px;height:1px;opacity:0;overflow:hidden}

/* ---------- Keyboard ---------- */
.keybed{
  margin-top:1rem;
  border:1px solid var(--hairline-strong);
  background:linear-gradient(180deg,#1a201c,#10140f);
  box-shadow:inset 0 2px 12px rgba(0,0,0,.7);
  padding:.7rem .7rem 1rem;
  position:relative;
}
.keybed-meta{
  display:flex;justify-content:space-between;align-items:center;gap:1rem;flex-wrap:wrap;
  font-family:var(--mono);font-size:.6rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--text-faint);padding:0 .2rem .6rem;
}
.keybed-meta kbd{
  font-family:var(--mono);font-size:.62rem;color:var(--accent);
  border:1px solid var(--hairline-strong);padding:.05rem .35rem;background:var(--panel-lo);
}
.keys{position:relative;height:120px;user-select:none;-webkit-user-select:none;touch-action:manipulation}
.key{
  position:absolute;top:0;height:100%;
  border:1px solid #050705;border-radius:0 0 3px 3px;
  background:linear-gradient(180deg,#e8ece6 0%,#cfd6cc 82%,#b9c2b6 100%);
  box-shadow:inset 0 -6px 10px -6px rgba(0,0,0,.5), 0 3px 6px rgba(0,0,0,.5);
  cursor:pointer;
  transition:transform 60ms var(--ease),background 60ms var(--ease);
}
.key .cap{
  position:absolute;bottom:.35rem;left:0;right:0;text-align:center;
  font-family:var(--mono);font-size:.56rem;color:#5c665c;pointer-events:none;
}
.key.active{
  transform:translateY(2px);
  background:linear-gradient(180deg,#f4ffd0 0%,var(--accent) 100%);
  box-shadow:inset 0 -4px 8px -4px rgba(0,0,0,.35), 0 0 14px var(--accent-glow);
}
.key.black{
  height:62%;width:calc(var(--bw));z-index:3;
  background:linear-gradient(180deg,#2c332d 0%,#151915 78%,#0a0c0a 100%);
  box-shadow:inset 0 -5px 8px -5px rgba(255,255,255,.12), 0 4px 8px rgba(0,0,0,.75);
}
.key.black .cap{color:#79847a;bottom:.25rem}
.key.black.active{
  background:linear-gradient(180deg,#39421f 0%,#232a12 100%);
  box-shadow:inset 0 0 0 1px var(--accent), 0 0 12px var(--accent-glow);
}
.key:focus-visible{outline:2px solid var(--accent);outline-offset:-2px;z-index:5}

/* ---------- Sequencer ---------- */
.seq{
  border:1px solid var(--hairline);background:var(--panel-lo);
  padding:.9rem;display:grid;gap:.7rem;
}
.seq-transport{display:flex;align-items:center;gap:.7rem;flex-wrap:wrap}
.seq-transport .btn{font-family:var(--mono);font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;padding:.5rem .8rem}
.tempo{display:flex;align-items:center;gap:.55rem;font-family:var(--mono);font-size:.62rem;letter-spacing:.14em;text-transform:uppercase;color:var(--text-muted)}
.tempo input[type="range"]{accent-color:var(--accent);width:7rem}
.tempo output{color:var(--accent);min-width:3.6rem}
.seq-track{display:grid;grid-template-columns:5.2rem repeat(16,minmax(0,1fr));gap:3px;align-items:center}
.seq-lane-label{
  font-family:var(--mono);font-size:.56rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--text-faint);text-align:right;padding-right:.5rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.step{
  position:relative;aspect-ratio:1/.82;min-height:1.5rem;
  border:1px solid var(--hairline);background:var(--surface);
  cursor:pointer;padding:0;
  transition:background var(--fast) var(--ease),border-color var(--fast) var(--ease);
}
.step:nth-child(4n+2){border-left-color:var(--hairline-strong)} /* beat markers */
.step:hover{border-color:var(--accent)}
.step.on{background:var(--accent-dim);border-color:var(--accent)}
.step.on::after{
  content:"";position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  width:38%;height:38%;border-radius:50%;background:var(--accent);
}
.step.cue{box-shadow:inset 0 0 0 2px var(--warm), 0 0 10px var(--warm-glow)}
.step.cue.on::after{background:var(--warm)}
.seq-note{
  font-family:var(--mono);font-size:.54rem;color:var(--text-faint);
  position:absolute;bottom:1px;left:2px;pointer-events:none;
}
@media(max-width:640px){
  .seq-track{grid-template-columns:3.4rem repeat(16,minmax(0,1fr))}
  .keys{height:96px}
}

/* ---------- Volume meter ---------- */
.meter{display:flex;align-items:center;gap:.5rem;font-family:var(--mono);font-size:.6rem;letter-spacing:.12em;color:var(--text-faint)}
.meter-bars{display:flex;gap:2px}
.meter-bars i{width:5px;height:12px;background:#222823;box-shadow:inset 0 0 0 1px rgba(0,0,0,.6)}
.meter-bars i.lit{background:var(--accent);box-shadow:0 0 6px var(--accent-glow)}
.meter-bars i.hot{background:var(--warm);box-shadow:0 0 6px var(--warm-glow)}