:root {
  --bg-void: #0c0c0e;
  --chassis: #19191c;
  --panel: #212125;
  --panel-raised: #2a2a2f;
  --metal-line: #38383e;
  --metal-line-light: #48484f;
  --led-green: #5fd97a;
  --led-amber: #f0a83c;
  --led-red: #e5484d;
  --text-label: #d6d4ce;
  --text-dim: #86868d;
  --accent: #ff8a3d;

  --font-display: 'JetBrains Mono', 'Courier New', monospace;
  --font-label: 'Barlow Condensed', sans-serif;
  --font-body: 'Inter', sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg-void);
  color: var(--text-label);
  font-family: var(--font-body);
  -webkit-tap-highlight-color: transparent;
}

body {
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: 20px 12px 40px;
}

.rack-frame {
  width: 100%;
  max-width: 440px;
  background: var(--chassis);
  border: 1px solid var(--metal-line);
  border-radius: 10px;
  padding: 14px;
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.5), inset 0 0 0 1px rgba(255, 255, 255, 0.02);
}

/* ---------- Brand plate ---------- */
.brand-plate {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 6px 8px 14px;
  border-bottom: 1px solid var(--metal-line);
  margin-bottom: 14px;
}

.brand-plate .brand-name {
  font-family: var(--font-label);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: 2px;
  color: var(--text-label);
}

.brand-plate .brand-sub {
  font-family: var(--font-label);
  font-size: 12px;
  letter-spacing: 1.5px;
  color: var(--text-dim);
  text-transform: uppercase;
}

/* ---------- Rack module panel (screwed-in unit look) ---------- */
.module {
  position: relative;
  background:
    radial-gradient(circle at 14px 14px, var(--metal-line-light) 1.4px, transparent 1.6px),
    radial-gradient(circle at calc(100% - 14px) 14px, var(--metal-line-light) 1.4px, transparent 1.6px),
    radial-gradient(circle at 14px calc(100% - 14px), var(--metal-line-light) 1.4px, transparent 1.6px),
    radial-gradient(circle at calc(100% - 14px) calc(100% - 14px), var(--metal-line-light) 1.4px, transparent 1.6px),
    linear-gradient(180deg, var(--panel-raised), var(--panel));
  border: 1px solid var(--metal-line);
  border-radius: 6px;
  padding: 16px 18px;
  margin-bottom: 12px;
}

.module-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.module-label {
  font-family: var(--font-label);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 2.5px;
  color: var(--text-dim);
  text-transform: uppercase;
}

.track-count {
  font-family: var(--font-display);
  font-size: 11px;
  color: var(--text-dim);
}

.power-led {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #3a1c14;
  box-shadow: inset 0 0 2px rgba(0, 0, 0, 0.6);
  transition: background 0.15s, box-shadow 0.15s;
}

.power-led.on {
  background: var(--led-green);
  box-shadow: 0 0 8px var(--led-green), 0 0 2px var(--led-green);
}

/* ---------- LCD readout ---------- */
.lcd-display {
  background: #0a0f0a;
  border: 1px solid #1c2b1c;
  border-radius: 4px;
  padding: 10px 12px;
  margin-bottom: 14px;
}

.track-title {
  font-family: var(--font-display);
  font-size: 13px;
  color: var(--led-green);
  text-shadow: 0 0 6px rgba(95, 217, 122, 0.45);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 4px;
}

.track-time {
  font-family: var(--font-display);
  font-size: 11px;
  color: #3f7a4d;
}

/* ---------- VU meters ---------- */
.vu-meters {
  display: flex;
  gap: 10px;
  margin-bottom: 14px;
}

.vu-channel {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 8px;
}

.vu-ch-label {
  font-family: var(--font-display);
  font-size: 10px;
  color: var(--text-dim);
  width: 10px;
}

.vu-bar {
  --level: 0;
  position: relative;
  flex: 1;
  height: 14px;
  border-radius: 2px;
  background:
    repeating-linear-gradient(90deg, #0a0a0b 0 2px, transparent 2px 5px),
    #141416;
  border: 1px solid var(--metal-line);
  overflow: hidden;
}

.vu-bar::after {
  content: '';
  position: absolute;
  inset: 0;
  width: calc(var(--level) * 100%);
  background: linear-gradient(90deg, var(--led-green) 0%, var(--led-green) 55%, var(--led-amber) 80%, var(--led-red) 96%);
  transition: width 0.05s linear;
}

/* ---------- Transport ---------- */
.transport {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}

.rack-btn {
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--text-label);
  background: linear-gradient(180deg, #34343a, #2a2a2f);
  border: 1px solid var(--metal-line-light);
  border-radius: 5px;
  padding: 9px 12px;
  cursor: pointer;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.04) inset, 0 2px 3px rgba(0, 0, 0, 0.3);
}

.rack-btn:active {
  transform: translateY(1px);
  box-shadow: none;
}

.rack-btn-primary {
  flex: 1;
  background: linear-gradient(180deg, #ff9a52, var(--accent));
  border-color: #c96a2a;
  color: #221208;
  font-weight: 700;
}

#btnOpen {
  margin-left: auto;
  font-size: 12px;
  font-family: var(--font-label);
  letter-spacing: 1px;
}

/* ---------- Sliders (seek / volume) ---------- */
input[type='range'] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 2px;
  background: #141416;
  border: 1px solid var(--metal-line);
  outline: none;
}

input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: linear-gradient(180deg, #e8e6e1, #b9b7b2);
  border: 1px solid #6b6b70;
  cursor: pointer;
  margin-top: -1px;
}

input[type='range']::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: linear-gradient(180deg, #e8e6e1, #b9b7b2);
  border: 1px solid #6b6b70;
  cursor: pointer;
}

.seek-slider { margin-bottom: 14px; }

.volume-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.knob-label {
  font-family: var(--font-label);
  font-size: 12px;
  letter-spacing: 1.5px;
  color: var(--text-dim);
  width: 34px;
}

#volumeVal {
  font-family: var(--font-display);
  font-size: 11px;
  color: var(--text-dim);
  width: 34px;
  text-align: right;
}

.rack-select {
  width: 100%;
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--text-label);
  background: linear-gradient(180deg, #26262b, #1e1e22);
  border: 1px solid var(--metal-line-light);
  border-radius: 5px;
  padding: 9px 10px;
  margin-bottom: 12px;
}

/* ---------- EQ rack ---------- */
.fader-value {
  font-family: var(--font-display);
  font-size: 11px;
  color: var(--text-dim);
}

.rack-btn-small {
  font-size: 10px;
  padding: 4px 10px;
  letter-spacing: 1px;
}

.eq-rack {
  display: flex;
  justify-content: space-between;
  gap: 6px;
  padding-top: 4px;
}

.eq-band {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  flex: 1;
}

.eq-band-val {
  font-family: var(--font-display);
  font-size: 10px;
  color: var(--accent);
  min-height: 12px;
}

.eq-band-label {
  font-family: var(--font-display);
  font-size: 10px;
  color: var(--text-dim);
}

.eq-slider-wrap {
  height: 130px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.eq-slider {
  width: 110px;
  transform: rotate(-90deg);
  margin: 0;
}

.dlms-sublabel {
  display: block;
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 1.5px;
  color: var(--accent);
  text-transform: uppercase;
  margin: 4px 0 8px;
  padding-top: 6px;
  border-top: 1px dashed var(--metal-line);
}

.dlms-sublabel:first-of-type {
  border-top: none;
  padding-top: 0;
}

/* ---------- Crossover rows ---------- */
.dsp-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.dsp-row .knob-label {
  width: 56px;
  flex-shrink: 0;
}

.dsp-row .fader-value {
  width: 56px;
  flex-shrink: 0;
  text-align: right;
}

/* ---------- Playlist ---------- */
.playlist-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 220px;
  overflow-y: auto;
}

.playlist-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 6px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 13px;
}

.playlist-item:hover { background: rgba(255, 255, 255, 0.03); }

.playlist-item.active {
  background: rgba(255, 138, 61, 0.1);
  color: var(--accent);
}

.track-index {
  font-family: var(--font-display);
  font-size: 11px;
  color: var(--text-dim);
}

.playlist-item.active .track-index { color: var(--accent); }

.track-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.playlist-empty {
  font-size: 12px;
  color: var(--text-dim);
  padding: 10px 6px;
}

/* ---------- Tabs ---------- */
.rack-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
}

.tab {
  flex: 1 1 30%;
  font-family: var(--font-label);
  font-size: 12px;
  letter-spacing: 1.2px;
  color: var(--text-dim);
  background: var(--panel);
  border: 1px solid var(--metal-line);
  border-radius: 4px;
  padding: 8px 4px;
  cursor: pointer;
  text-transform: uppercase;
}

.tab.active {
  color: var(--accent);
  border-color: #6b4322;
  background: linear-gradient(180deg, #2c221a, var(--panel));
}

/* ---------- Panels / placeholders ---------- */
.module-group { display: none; }
.module-group.active { display: block; }

.coming-soon {
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.6;
}

.preset-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 6px;
  border-bottom: 1px solid var(--metal-line);
  font-size: 13px;
}

.preset-item .track-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ---------- Scrollbar (webkit) ---------- */
.playlist-list::-webkit-scrollbar { width: 6px; }
.playlist-list::-webkit-scrollbar-thumb {
  background: var(--metal-line-light);
  border-radius: 3px;
}

@media (max-width: 380px) {
  .rack-frame { padding: 10px; }
  .module { padding: 14px; }
}