:root {
  --bg: #0a0a0a;
  --fg: #e5e5e5;
  --muted: #9b9b9b;
  --accent: #ffffff;
  --line: rgba(255,255,255,0.08);
  --grid: rgba(255,255,255,0.05);
  --active: #00ffd0;
}

* { box-sizing: border-box; }
html, body, #app { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 13px/1.4 system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
}

.topbar {
  display: grid;
  grid-template-columns: 180px 1fr auto;
  gap: 16px;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: linear-gradient(180deg, rgba(10,10,10,0.95), rgba(10,10,10,0.75));
  backdrop-filter: blur(6px);
  z-index: 10;
}

.brand {
  letter-spacing: 0.25em;
  font-weight: 700;
}

.transport, .io { display: flex; align-items: center; gap: 12px; }

.control { display: flex; align-items: center; gap: 8px; color: var(--muted); }
.control input[type="number"], .control select {
  background: transparent; border: 1px solid var(--line); color: var(--fg);
  outline: none; padding: 4px 6px; border-radius: 4px; width: 72px;
}
.control input[type="range"] { width: 120px; }

.control.checkbox { 
  display: flex; 
  align-items: center; 
  gap: 6px; 
  color: var(--muted); 
  cursor: pointer;
}
.control.checkbox input[type="checkbox"] {
  width: auto;
  margin: 0;
  cursor: pointer;
}

.btn {
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--line);
  padding: 6px 10px;
  border-radius: 4px;
  cursor: pointer;
}
.btn:hover { border-color: rgba(255,255,255,0.2); }
.btn.subtle { color: var(--muted); }
.btn.full { width: 100%; text-align: left; }

.main {
  display: grid;
  grid-template-columns: 240px 1fr;
  height: calc(100% - 56px);
}
.sidebar {
  border-right: 1px solid var(--line);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.section-title { color: var(--muted); letter-spacing: 0.18em; font-size: 11px; }
.row { display: flex; gap: 8px; align-items: center; }
.list { width: 100%; background: transparent; color: var(--fg); border: 1px solid var(--line); border-radius: 4px; height: 120px; }
.song-list { margin: 0; padding-left: 18px; color: var(--muted); max-height: 160px; overflow: auto; }
.divider { height: 1px; background: var(--line); margin: 8px 0; }
.hint { color: var(--muted); font-size: 11px; margin-top: 8px; }

.tracks { position: relative; overflow: auto; }
.tracks-container {
  display: flex; flex-direction: column; gap: 8px; padding: 16px;
}

.track {
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}
.track-head {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  padding: 8px 10px;
  background: rgba(255,255,255,0.02);
  border-bottom: 1px solid var(--line);
}
.track-title { letter-spacing: 0.12em; color: var(--muted); }
.track-controls { display: flex; gap: 8px; align-items: center; }
.track-controls input, .track-controls select { width: auto; }

.steps {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(24px, 1fr);
  gap: 1px;
  background: var(--grid);
  padding: 1px;
}
.step {
  background: rgba(255,255,255,0.03);
  height: 28px;
  display: flex; align-items: center; justify-content: center;
  color: var(--muted);
  cursor: pointer;
  position: relative;
}
.step.active { background: rgba(255,255,255,0.08); color: var(--fg); }
.step.playhead::after {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0; width: 2px;
  background: var(--active);
}

#viz {
  position: fixed; inset: 0;
  z-index: -1;
  pointer-events: none;
}

/* Minimal micro-animations */
.pulse { animation: pulse 0.25s ease-out; }
@keyframes pulse {
  from { box-shadow: 0 0 0px rgba(0,255,208,0.0); }
  to { box-shadow: 0 0 24px rgba(0,255,208,0.15); }
}