:root {
  --bg: #0a0a0f;
  --surface: #14141f;
  --surface-light: #1e1e2e;
  --border: #2a2a3a;
  --text: #c8c8d4;
  --text-dim: #6a6a7a;
  --accent: #ff6b35;
  --accent-glow: #ff8c5a;
  --green: #00e676;
  --red: #ff1744;
  --channel-w: 220px;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, 'SF Pro Display', 'Helvetica Neue', sans-serif;
  overflow-x: auto;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ========== TOP BAR ========== */
#top-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  font-size: 28px;
  font-weight: 900;
  color: var(--accent);
  letter-spacing: -2px;
  text-shadow: 0 0 20px rgba(255,107,53,0.4);
}

.master-section {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.master-section label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-dim);
}

#master-volume {
  width: 80px;
  accent-color: var(--accent);
}

.vu-meter {
  font-family: 'SF Mono', monospace;
  font-size: 12px;
  color: var(--green);
  min-width: 40px;
}

.global-bpm {
  display: flex;
  flex-direction: column;
  align-items: center;
}

#master-bpm {
  font-size: 32px;
  font-weight: 700;
  color: var(--accent);
  font-family: 'SF Mono', monospace;
}

.global-bpm label {
  font-size: 9px;
  color: var(--text-dim);
  letter-spacing: 2px;
}

.btn-sync {
  background: var(--accent);
  color: #000;
  border: none;
  padding: 8px 16px;
  border-radius: 4px;
  font-weight: 700;
  font-size: 12px;
  cursor: pointer;
  letter-spacing: 1px;
}

.btn-sync:hover {
  background: var(--accent-glow);
  box-shadow: 0 0 16px rgba(255,107,53,0.3);
}

/* ========== CHANNEL GRID ========== */
#channel-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  padding: 8px;
  flex: 1;
  max-width: calc(var(--channel-w) * 4 + 40px);
  margin: 0 auto;
}

/* ========== CHANNEL BOX ========== */
.channel-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: var(--channel-w);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.channel-box.playing {
  border-color: var(--green);
  box-shadow: 0 0 12px rgba(0,230,118,0.15);
}

.channel-box.beat-flash {
  border-color: var(--accent);
  box-shadow: 0 0 16px rgba(255,107,53,0.3);
}

.ch-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 4px;
}

.ch-number {
  font-weight: 700;
  font-size: 14px;
  color: var(--accent);
  font-family: 'SF Mono', monospace;
}

.ch-bpm {
  font-size: 11px;
  color: var(--text-dim);
  font-family: 'SF Mono', monospace;
}

.btn-sync-sm {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-dim);
  border-radius: 3px;
  width: 24px;
  height: 24px;
  font-size: 12px;
  cursor: pointer;
}
.btn-sync-sm:hover { border-color: var(--accent); color: var(--accent); }
.btn-sync-sm.locked { background: var(--accent); color: #000; border-color: var(--accent); }

/* Waveform */
.ch-waveform {
  height: 48px;
  background: #000;
  border-radius: 3px;
  overflow: hidden;
}

.waveform-canvas {
  width: 100%;
  height: 100%;
}

/* Track info */
.ch-track-info {
  display: flex;
  justify-content: space-between;
  font-size: 10px;
}

.ch-track-name {
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 120px;
}

.ch-folder {
  color: var(--text-dim);
  font-family: 'SF Mono', monospace;
  font-size: 9px;
}

/* Transport buttons */
.ch-transport {
  display: flex;
  gap: 4px;
}

.ch-transport button {
  flex: 1;
  background: var(--surface-light);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 4px;
  border-radius: 3px;
  font-size: 12px;
  cursor: pointer;
}

.ch-play:hover { border-color: var(--green); color: var(--green); }
.ch-stop:hover { border-color: var(--red); color: var(--red); }
.ch-cue:hover { border-color: var(--accent); color: var(--accent); }

/* Controls */
.ch-controls {
  display: flex;
  gap: 4px;
}

.ch-knob-row, .ch-fader-row {
  display: flex;
  gap: 6px;
  justify-content: center;
}

.knob-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.knob-group label {
  font-size: 8px;
  color: var(--text-dim);
  letter-spacing: 1px;
}

.knob {
  width: 40px;
  height: 24px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--surface-light);
  border-radius: 12px;
  outline: none;
  writing-mode: bt-lr;
  accent-color: var(--accent);
}

.knob::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 10px;
  height: 10px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
}

.fader {
  width: 20px;
  height: 60px;
  writing-mode: bt-lr;
  accent-color: var(--accent);
}

/* Load button */
.ch-load {
  display: flex;
  gap: 4px;
}

.ch-browse {
  flex: 1;
  background: var(--surface-light);
  border: 1px dashed var(--border);
  color: var(--text-dim);
  padding: 6px;
  border-radius: 4px;
  font-size: 11px;
  cursor: pointer;
}

.ch-browse:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ========== TRANSPORT ========== */
#transport {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 8px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  position: sticky;
  bottom: 0;
}

#transport button {
  background: var(--surface-light);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 24px;
  border-radius: 4px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}

#play-all:hover { border-color: var(--green); color: var(--green); }
#stop-all:hover { border-color: var(--red); color: var(--red); }

#global-status {
  font-size: 11px;
  color: var(--text-dim);
  font-family: 'SF Mono', monospace;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 960px) {
  #channel-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 500px) {
  #channel-grid {
    grid-template-columns: 1fr;
  }
  :root { --channel-w: 100%; }
}