.mb-app {
  --mb-bg: #0d1117;
  --mb-panel: #151b23;
  --mb-panel-2: #1b2430;
  --mb-border: #2b3645;
  --mb-text: #edf2f7;
  --mb-muted: #9aa8b6;
  --mb-accent: #7bc7ff;
  --mb-accent-strong: #36aaf5;
  color: var(--mb-text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.mb-app * { box-sizing: border-box; }

.mb-shell {
  max-width: 1180px;
  margin: 0 auto;
  padding: 24px;
  background: var(--mb-bg);
  border: 1px solid var(--mb-border);
  border-radius: 18px;
}

.mb-header {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-start;
  margin-bottom: 24px;
}

.mb-eyebrow {
  margin: 0 0 6px;
  color: var(--mb-accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .16em;
}

.mb-header h2 { margin: 0; font-size: clamp(24px, 4vw, 38px); line-height: 1.08; }
.mb-subtitle { margin: 8px 0 0; color: var(--mb-muted); }
.mb-status {
  padding: 8px 12px;
  border: 1px solid var(--mb-border);
  border-radius: 999px;
  color: var(--mb-muted);
  font-size: 13px;
  white-space: nowrap;
}

.mb-controls {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 14px;
  padding: 18px;
  background: var(--mb-panel);
  border: 1px solid var(--mb-border);
  border-radius: 14px;
}

.mb-controls label { display: flex; flex-direction: column; gap: 7px; min-width: 0; }
.mb-controls label > span { color: var(--mb-muted); font-size: 12px; font-weight: 700; }
.mb-controls select,
.mb-controls input[type="number"] {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--mb-border);
  border-radius: 9px;
  background: var(--mb-panel-2);
  color: var(--mb-text);
  padding: 8px 10px;
}

.mb-range-control { grid-column: span 2; }
.mb-range-control input { width: 100%; accent-color: var(--mb-accent-strong); }
.mb-range-control small { display: flex; justify-content: space-between; color: var(--mb-muted); font-size: 11px; }
.mb-range-control strong { color: var(--mb-text); }

.mb-actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0; }
.mb-actions button {
  min-height: 42px;
  padding: 10px 16px;
  border: 1px solid var(--mb-border);
  border-radius: 10px;
  background: var(--mb-panel-2);
  color: var(--mb-text);
  font-weight: 750;
  cursor: pointer;
}
.mb-actions button:hover { border-color: var(--mb-accent); }
.mb-actions .mb-primary { background: var(--mb-accent-strong); border-color: var(--mb-accent-strong); color: #06111a; }

.mb-output {
  padding: 18px;
  background: var(--mb-panel);
  border: 1px solid var(--mb-border);
  border-radius: 14px;
}

.mb-output-meta { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 14px; }
.mb-output-meta span {
  padding: 6px 9px;
  border-radius: 7px;
  background: var(--mb-panel-2);
  color: var(--mb-muted);
  font-size: 12px;
}

.mb-chord-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.mb-chord-card {
  position: relative;
  min-height: 150px;
  padding: 16px;
  border: 1px solid var(--mb-border);
  border-radius: 12px;
  background: linear-gradient(180deg, var(--mb-panel-2), #111820);
  overflow: hidden;
}
.mb-chord-index { position: absolute; top: 10px; right: 12px; color: #667383; font-size: 11px; font-weight: 800; }
.mb-roman { color: var(--mb-accent); font-size: 14px; font-weight: 850; }
.mb-chord-name { margin-top: 15px; font-size: 34px; font-weight: 850; letter-spacing: -.03em; }
.mb-notes { margin-top: 12px; color: var(--mb-muted); font-size: 13px; }

.mb-analysis { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 16px; color: var(--mb-muted); font-size: 13px; }
.mb-analysis strong { color: var(--mb-text); }

.mb-debug { margin-top: 14px; color: var(--mb-muted); }
.mb-debug summary { cursor: pointer; font-weight: 700; }
.mb-debug pre { max-height: 300px; overflow: auto; padding: 12px; background: #090d12; border-radius: 10px; font-size: 12px; }

@media (max-width: 900px) {
  .mb-controls { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .mb-chord-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 600px) {
  .mb-shell { padding: 14px; border-radius: 12px; }
  .mb-header { flex-direction: column; }
  .mb-controls { grid-template-columns: 1fr 1fr; padding: 14px; }
  .mb-range-control { grid-column: span 2; }
  .mb-chord-grid { grid-template-columns: 1fr; }
}

/* v0.2 MIDI export */
.mb-actions .mb-midi-button {
  border-color: var(--mb-accent);
  color: var(--mb-accent);
}
.mb-actions .mb-midi-button:hover {
  background: var(--mb-accent);
  color: #06111a;
}
.mb-midi-info {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
  margin-top: 14px;
  padding: 14px 16px;
  border: 1px solid var(--mb-border);
  border-radius: 12px;
  background: var(--mb-panel);
  color: var(--mb-muted);
  font-size: 12px;
}
.mb-midi-info > div:first-child {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.mb-midi-info strong { color: var(--mb-text); }

@media (max-width: 600px) {
  .mb-midi-info { align-items: flex-start; flex-direction: column; }
}

/* v0.3 chord performance */
.mb-performance-line {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-top: 14px;
  padding-top: 10px;
  border-top: 1px solid var(--mb-border);
  color: var(--mb-muted);
  font-size: 11px;
  text-transform: capitalize;
}
.mb-performance-line strong { color: var(--mb-accent); font-weight: 800; }
.mb-voicing-notes { margin-top: 6px; color: #7f8d9c; font-size: 11px; }

/* v0.4 browser playback + MIDI timeline */
.mb-actions .mb-preview-button {
  border-color: #85d9a8;
  color: #a8e8c1;
}
.mb-actions .mb-preview-button:hover:not(:disabled) {
  background: #85d9a8;
  color: #07130d;
}
.mb-actions button:disabled {
  opacity: .42;
  cursor: not-allowed;
}
.mb-preview-panel {
  margin-top: 18px;
  border: 1px solid var(--mb-border);
  border-radius: 12px;
  background: #0b1016;
  overflow: hidden;
}
.mb-preview-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 14px;
  border-bottom: 1px solid var(--mb-border);
  background: #111820;
}
.mb-preview-heading > div:first-child {
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.mb-preview-heading strong { color: var(--mb-text); font-size: 13px; }
.mb-preview-heading span { color: var(--mb-muted); font-size: 11px; }
.mb-transport-readout {
  flex: 0 0 auto;
  color: var(--mb-accent);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  font-weight: 800;
}
.mb-piano-roll {
  max-height: 430px;
  overflow: auto;
  position: relative;
  scrollbar-color: #3b4858 #0b1016;
}
.mb-roll-empty {
  padding: 32px 18px;
  color: var(--mb-muted);
  text-align: center;
  font-size: 12px;
}
.mb-roll-grid {
  display: flex;
  min-width: 760px;
  position: relative;
}
.mb-roll-labels {
  position: sticky;
  left: 0;
  z-index: 8;
  flex: 0 0 var(--mb-roll-label-width, 58px);
  border-right: 1px solid #394554;
  background: #111820;
}
.mb-roll-key {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 8px;
  border-bottom: 1px solid #222c38;
  color: #8190a0;
  font-size: 10px;
  font-variant-numeric: tabular-nums;
}
.mb-roll-key.is-c {
  color: var(--mb-accent);
  font-weight: 800;
}
.mb-roll-lane {
  position: relative;
  flex: 1 1 auto;
  min-width: 700px;
  overflow: hidden;
  background: #0b1016;
}
.mb-roll-row {
  position: absolute;
  left: 0;
  right: 0;
  border-bottom: 1px solid #17202a;
  pointer-events: none;
}
.mb-roll-row.is-black-key { background: rgba(255,255,255,.018); }
.mb-roll-beat-line {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 1px;
  background: #25303d;
  pointer-events: none;
}
.mb-roll-beat-line.is-bar {
  width: 2px;
  background: #465568;
}
.mb-roll-note {
  position: absolute;
  z-index: 3;
  min-width: 3px;
  border: 1px solid #77c6fb;
  border-radius: 3px;
  background: #278fce;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.08);
  overflow: hidden;
}
.mb-roll-note:hover {
  z-index: 5;
  border-color: #d9f1ff;
  filter: brightness(1.18);
}
.mb-roll-playhead {
  position: absolute;
  z-index: 7;
  top: 0;
  bottom: 0;
  width: 2px;
  background: #ffdd70;
  box-shadow: 0 0 8px rgba(255,221,112,.45);
  pointer-events: none;
  transform: translateX(-1px);
}

@media (max-width: 600px) {
  .mb-preview-heading { align-items: flex-start; flex-direction: column; }
  .mb-piano-roll { max-height: 350px; }
  .mb-roll-grid { min-width: 680px; }
}
\n\n/* v0.5 multi-track controls */\n.mb-track-mixer{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:18px 0 14px}.mb-track-row{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:12px 14px;border:1px solid rgba(110,126,143,.35);border-radius:10px;background:rgba(255,255,255,.55)}.mb-track-row>div{display:flex;flex-direction:column;gap:2px}.mb-track-row span{font-size:12px;opacity:.72}.mb-track-row label{display:flex;align-items:center;gap:7px;font-size:13px;font-weight:600;white-space:nowrap}.mb-bass-line{margin-top:8px;padding-top:7px;border-top:1px dashed rgba(110,126,143,.35);font-size:12px;line-height:1.45}.mb-roll-note.is-bass{border-radius:9px;box-shadow:inset 0 0 0 1px rgba(0,0,0,.26);filter:saturate(.75) brightness(.82)}.mb-roll-note.is-chords{border-radius:4px}.mb-actions{flex-wrap:wrap}@media(max-width:760px){.mb-track-mixer{grid-template-columns:1fr}.mb-track-row{align-items:flex-start;flex-direction:column}}\n
/* v0.5.2 timing / quantization */
.mb-actions button.is-active,
.mb-actions button[aria-pressed="true"] {
  border-color: #85d9a8;
  background: #183126;
  color: #b8f0ce;
}