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

:root {
  --bg: #1a1a2e;
  --surface: #16213e;
  --surface2: #0f3460;
  --accent: #e94560;
  --text: #eaeaea;
  --text-dim: #b0b0b0;
  --step-off: #2a2a4a;
  --step-off-hover: #3a3a5a;
  --header-h: 3.2rem;
  --track-h: 3rem;
  --label-w: 17rem;
  --border: #2a2a5a;
}

html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  font-family: 'Courier New', monospace;
  background: var(--bg);
  color: var(--text);
}

#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  padding: 0.5rem;
  gap: 0.4rem;
}

/* HEADER */
#header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.4rem 0.8rem;
  height: var(--header-h);
  flex-shrink: 0;
}

#title-section {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

#app-title {
  font-size: 1.1rem;
  font-weight: bold;
  letter-spacing: 0.15em;
  color: var(--accent);
}

#pattern-label {
  font-size: 0.65rem;
  color: var(--text-dim);
  letter-spacing: 0.1em;
}

#pattern-controls {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

#pat-num {
  font-size: 1rem;
  font-weight: bold;
  min-width: 1.5rem;
  text-align: center;
}

.pat-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 3px;
  padding: 0.1rem 0.4rem;
  cursor: pointer;
  font-size: 0.65rem;
}
.pat-btn:hover { background: var(--accent); }

#transport {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

#bpm-section, #steps-section {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.bpm-label, .steps-label {
  font-size: 0.6rem;
  color: var(--text-dim);
  letter-spacing: 0.1em;
}

#bpm-display, #steps-display {
  font-size: 1.1rem;
  font-weight: bold;
  min-width: 2.5rem;
  text-align: center;
}

#bpm-display {
  cursor: ns-resize;
  user-select: none;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--surface2);
  transition: background 0.1s, border-color 0.1s;
}
#bpm-display:hover { background: #1a3a70; border-color: var(--accent); }
#bpm-display.bpm-editing {
  cursor: text;
  outline: 2px solid var(--accent);
  background: var(--surface);
  user-select: text;
}

.bpm-btn, .steps-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 3px;
  padding: 0.1rem 0.35rem;
  cursor: pointer;
  font-size: 0.55rem;
  line-height: 1;
}
.bpm-btn:hover, .steps-btn:hover { background: var(--surface2); filter: brightness(1.4); }

.transport-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 4px;
  padding: 0.3rem 0.7rem;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  transition: background 0.1s;
}
.transport-btn:hover { background: #1a3a70; }
.transport-btn.active { background: #1a7a30; border-color: #2aaa50; color: #afffbf; }
.transport-btn.danger { border-color: #6a2a2a; }
.transport-btn.danger:hover { background: #6a2020; }
.rand-all-btn { border-color: #6a5a20; color: #ffd866; }
.rand-all-btn:hover { background: #5a4a10; }

/* CHAIN BAR */
#chain-bar {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.25rem 0.8rem;
  height: 2.2rem;
  flex-shrink: 0;
  transition: border-color 0.2s;
}

#chain-bar.chain-active {
  border-color: #2aaa50;
}

.chain-label {
  font-size: 0.6rem;
  color: var(--text-dim);
  letter-spacing: 0.12em;
  flex-shrink: 0;
}

.chain-toggle-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text-dim);
  border-radius: 3px;
  padding: 0.1rem 0.45rem;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  flex-shrink: 0;
  transition: background 0.1s;
}
.chain-toggle-btn.active {
  background: #1a5a30;
  border-color: #2aaa50;
  color: #afffbf;
}

#chain-steps-row {
  display: flex;
  gap: 2px;
  flex: 1;
}

.chain-step-btn {
  flex: 1;
  height: 1.6rem;
  border-radius: 3px;
  border: 1px solid var(--border);
  background: var(--step-off);
  color: var(--text-dim);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.65rem;
  font-weight: bold;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  transition: filter 0.06s;
}
.chain-step-btn:hover { filter: brightness(1.35); }

.chain-step-btn.beat-div { margin-left: 3px; }

.chain-step-btn.chain-current {
  outline: 2px solid rgba(255,255,255,0.9);
  outline-offset: -2px;
  z-index: 2;
}

/* MAIN GRID */
#main-grid {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  gap: 0;
}

#track-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

/* SECTION HEADERS */
.section-header {
  display: flex;
  align-items: center;
  padding: 0.25rem 0.4rem;
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  color: var(--text-dim);
  text-transform: uppercase;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  margin-top: 0.3rem;
}

.section-header:first-child { margin-top: 0; }

/* TRACK ROW */
.track-row {
  display: flex;
  align-items: center;
  height: var(--track-h);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  gap: 2px;
}

.track-label {
  width: var(--label-w);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0 0.4rem;
  border-right: 1px solid var(--border);
  height: 100%;
  background: var(--surface2);
}

.track-color-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.track-name {
  font-size: 0.7rem;
  font-weight: bold;
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.track-mute-btn {
  width: 1.4rem; height: 1.4rem;
  border-radius: 3px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-dim);
  font-size: 0.55rem;
  cursor: pointer;
  font-family: inherit;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.track-mute-btn:hover { background: var(--surface); color: var(--text); }
.track-mute-btn.muted { background: #5a2a2a; color: #ff8888; border-color: #aa4444; }

.track-solo-btn {
  width: 1.4rem; height: 1.4rem;
  border-radius: 3px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-dim);
  font-size: 0.55rem;
  cursor: pointer;
  font-family: inherit;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.track-solo-btn:hover { background: var(--surface); color: var(--text); }
.track-solo-btn.soloed { background: #4a4a1a; color: #ffdd44; border-color: #aaaa33; }

.track-settings-btn {
  width: 1.4rem; height: 1.4rem;
  border-radius: 3px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-dim);
  font-size: 0.7rem;
  cursor: pointer;
  font-family: inherit;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  line-height: 1;
}
.track-settings-btn:hover { background: var(--surface2); color: var(--accent); }

.track-vol {
  width: 3.5rem;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 0.2rem;
  padding: 0 0.3rem;
  border-right: 1px solid var(--border);
  height: 100%;
}

.track-vol input[type=range] {
  width: 100%;
  height: 3px;
  accent-color: var(--accent);
  cursor: pointer;
}

/* STEP GRID */
.step-grid {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 0.2rem 0.3rem;
  overflow: hidden;
}

.step-btn {
  flex: 1;
  height: 2.2rem;
  border-radius: 3px;
  border: 1px solid transparent;
  background: var(--step-off);
  cursor: pointer;
  transition: background 0.06s, transform 0.06s;
  font-size: 0.55rem;
  font-family: inherit;
  color: rgba(255,255,255,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  position: relative;
  overflow: hidden;
  min-width: 0;
}

.step-btn:hover { background: var(--step-off-hover); }

.step-btn.active {
  border-color: rgba(255,255,255,0.3);
  box-shadow: 0 0 6px rgba(255,255,255,0.15);
}

.step-btn.current {
  outline: 2px solid rgba(255,255,255,0.9);
  outline-offset: -2px;
  transform: scaleY(1.05);
  z-index: 2;
}

.step-btn.beat-marker {
  border-left: 2px solid rgba(255,255,255,0.15);
}

.step-note {
  font-size: 0.5rem;
  line-height: 1;
  text-align: center;
  pointer-events: none;
  position: relative;
  z-index: 1;
}

/* Velocity fill — grows from the bottom, behind the note label */
.step-vel-fill {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 0;
  pointer-events: none;
  border-radius: 0 0 2px 2px;
  transition: height 0.08s;
}

/* Dashed border hint for steps with chance < 100% */
.step-btn.low-chance {
  border-style: dashed;
}
.step-btn.low-chance .step-vel-fill {
  opacity: 0.65;
}

/* NOTE PICKER */

/* GROUP DIVIDERS every 4 steps (applied via JS class) */
.step-btn.beat-marker {
  margin-left: 3px;
}

/* NOTE PICKER */
#note-picker {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 100;
}

#note-picker.hidden { display: none; }

#note-picker-inner {
  pointer-events: all;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0;
  min-width: 340px;
  max-width: 92vw;
  box-shadow: 0 8px 32px rgba(0,0,0,0.7);
}

#note-picker-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.8rem 0.4rem;
  cursor: grab;
  border-bottom: 1px solid var(--border);
  user-select: none;
  border-radius: 8px 8px 0 0;
  background: var(--surface2);
}
#note-picker-header:active { cursor: grabbing; }

#note-picker-close-x {
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 0.85rem;
  cursor: pointer;
  padding: 0 0.2rem;
  line-height: 1;
  pointer-events: all;
}
#note-picker-close-x:hover { color: var(--accent); }

#note-picker-title {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  text-align: left;
  pointer-events: none;
}

/* Piano keyboard */
#piano-wrap {
  display: flex;
  overflow-x: auto;
  background: #111;
  border-radius: 4px;
  padding: 0.4rem 0.4rem 0;
  margin: 0.5rem 0.5rem 0.5rem;
  gap: 3px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
#piano-wrap::-webkit-scrollbar { height: 4px; }
#piano-wrap::-webkit-scrollbar-track { background: #111; }
#piano-wrap::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.piano-oct {
  position: relative;
  flex-shrink: 0;
  padding-bottom: 1.2rem;
}

.piano-whites {
  display: flex;
}

.piano-wk {
  width: 1.5rem;
  height: 4rem;
  background: #f0e8cc;
  border: 1px solid #888;
  border-radius: 0 0 4px 4px;
  cursor: pointer;
  font-size: 0;
  color: #555;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 0.15rem;
  transition: background 0.06s;
  position: relative;
  box-sizing: border-box;
  flex-shrink: 0;
}
.piano-wk + .piano-wk { border-left: none; }
.piano-wk:hover { background: #d8d0b8; }
.piano-wk.selected { background: var(--accent) !important; }
.piano-wk.selected .wk-label { color: #fff; }

.wk-label {
  font-size: 0.38rem;
  color: #888;
  text-align: center;
  pointer-events: none;
  position: absolute;
  bottom: 0.2rem;
  left: 0;
  right: 0;
}

.piano-bk {
  position: absolute;
  top: 0;
  width: 0.9rem;
  height: 2.5rem;
  background: #222;
  border: 1px solid #000;
  border-radius: 0 0 3px 3px;
  cursor: pointer;
  z-index: 2;
  transition: background 0.06s;
}
.piano-bk:hover { background: #444; }
.piano-bk.selected { background: var(--accent) !important; border-color: var(--accent); }

/* Probability row */
.note-prob-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.6rem;
  padding: 0 0.7rem;
}

.note-prob-label {
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  width: 3rem;
  flex-shrink: 0;
}

#note-prob-slider {
  flex: 1;
  height: 4px;
  accent-color: var(--accent);
  cursor: pointer;
}

#note-prob-val {
  font-size: 0.7rem;
  min-width: 2.5rem;
  text-align: right;
}

/* Action buttons row */
.note-picker-actions {
  display: flex;
  gap: 0.5rem;
  padding: 0 0.7rem;
}

#note-clear-btn {
  flex: 1;
  padding: 0.4rem;
  border-radius: 4px;
  border: 1px solid #6a2a2a;
  background: #3a1010;
  color: #ff8888;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.7rem;
}
#note-clear-btn:hover { background: #5a1818; }

#note-picker-close {
  flex: 1;
  padding: 0.4rem;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.7rem;
  letter-spacing: 0.05em;
}
#note-picker-close:hover { background: var(--accent); color: #fff; }

/* STEP DETAIL POPUP */
#step-detail {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

#step-detail.hidden { display: none; }

#step-detail-inner {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  min-width: 240px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

#step-detail-title {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  text-align: center;
  margin-bottom: 0.2rem;
}

.detail-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.detail-label {
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  width: 3.5rem;
  flex-shrink: 0;
}

#detail-vel-slider {
  flex: 1;
  height: 4px;
  accent-color: var(--accent);
  cursor: pointer;
}

#detail-vel-val {
  font-size: 0.7rem;
  min-width: 2.5rem;
  text-align: right;
}

.detail-select {
  flex: 1;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 3px;
  padding: 0.2rem 0.3rem;
  font-family: inherit;
  font-size: 0.7rem;
  cursor: pointer;
}

#step-detail-close {
  width: 100%;
  padding: 0.4rem;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.7rem;
  margin-top: 0.2rem;
}
#step-detail-close:hover { background: var(--accent); }

/* Scrollbar styling */
#main-grid::-webkit-scrollbar { width: 6px; }
#main-grid::-webkit-scrollbar-track { background: var(--bg); }
#main-grid::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* TRACK WRAP — outer container for row + inline panel */
.track-wrap {
  display: flex;
  flex-direction: column;
}

.track-wrap.panel-open .track-row {
  border-radius: 4px 4px 0 0;
  border-bottom-color: #1a2a5a;
}

/* INLINE SOUND PANEL */
.track-panel {
  display: none;
  background: #090f1e;
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 6px 6px;
  padding: 0.45rem 0.6rem 0.5rem;
}
.track-panel.open { display: block; }

/* TAB BAR */
.tp-tab-bar {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  margin-bottom: 0.4rem;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid #1a2a4a;
}

.tp-test-btn {
  padding: 0.12rem 0.45rem;
  border-radius: 3px;
  border: 1px solid var(--accent);
  background: transparent;
  color: var(--accent);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.57rem;
  letter-spacing: 0.04em;
  white-space: nowrap;
  flex-shrink: 0;
  transition: background 0.1s, color 0.1s;
}
.tp-test-btn:hover { background: var(--accent); color: #fff; }

.tp-tab {
  padding: 0.12rem 0.45rem;
  border-radius: 3px;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text-dim);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.57rem;
  letter-spacing: 0.06em;
  transition: background 0.1s;
}
.tp-tab:hover { filter: brightness(1.3); }
.tp-tab.active { background: #1e3060; border-color: #4466cc; color: #99bbff; }

/* PANEL BODY */
.tp-body {
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
}

.tp-knobs {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.tp-viz { flex-shrink: 0; }

.tp-viz-canvas {
  display: block;
  border-radius: 4px;
  background: #060c18;
  border: 1px solid #1a2a4a;
}

/* KNOB ROW */
.tp-knob-row {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
  align-items: flex-start;
}

/* INDIVIDUAL KNOB */
.knob-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
  user-select: none;
}
.knob-wrap canvas { cursor: ns-resize; display: block; }

.knob-lbl {
  font-size: 0.44rem;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  text-align: center;
}

.knob-val {
  font-size: 0.5rem;
  color: var(--text);
  text-align: center;
  min-width: 2.8rem;
  font-family: inherit;
}

/* PRESET / WAVE ROWS */
.tp-preset-row { margin-bottom: 0.25rem; }

.tp-select {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 3px;
  padding: 0.15rem 0.3rem;
  font-family: inherit;
  font-size: 0.62rem;
  cursor: pointer;
}

/* OSC tab: preset + waveform on one row */
.tp-osc-top-row {
  display: flex;
  gap: 0.3rem;
  align-items: center;
  margin-bottom: 0.25rem;
}

.tp-preset-sel {
  flex: 1;
  min-width: 0;
  width: auto;
  max-width: 9rem;
}

.tp-wave-select {
  width: 6.5rem;
  flex-shrink: 0;
}

/* Section label within OSC tab (ENV header) */
.tp-section-lbl {
  font-size: 0.44rem;
  letter-spacing: 0.12em;
  color: var(--accent);
  padding: 0.15rem 0 0.1rem;
  border-bottom: 1px solid #2a3a6a;
  margin-bottom: 0.15rem;
  margin-top: 0.1rem;
}

.tp-wave-row {
  display: flex;
  gap: 0.2rem;
  margin-bottom: 0.25rem;
}

.tp-wave-btn {
  flex: 1;
  padding: 0.12rem;
  border-radius: 3px;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text-dim);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.57rem;
  text-align: center;
  letter-spacing: 0.04em;
  transition: background 0.1s;
}
.tp-wave-btn:hover { filter: brightness(1.3); }
.tp-wave-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }

/* FX GROUPS */
.tp-fx-row {
  display: flex;
  gap: 0.7rem;
  align-items: flex-start;
  flex-wrap: wrap;
}

.tp-fx-group {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.tp-fx-lbl {
  font-size: 0.48rem;
  letter-spacing: 0.12em;
  color: var(--accent);
  border-bottom: 1px solid #2a3a6a;
  padding-bottom: 0.1rem;
  margin-bottom: 0.05rem;
}

/* SETTINGS BTN ACTIVE STATE */
.track-settings-btn.active {
  background: #1e3060;
  color: #99bbff;
  border-color: #4466cc;
}

/* RANDOMIZE BUTTONS */
.track-rand-btn {
  width: 1.5rem; height: 1.4rem;
  border-radius: 3px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-dim);
  font-size: 0.6rem;
  cursor: pointer;
  font-family: inherit;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  letter-spacing: 0;
  padding: 0;
}
.track-rand-btn:hover { background: var(--surface2); color: var(--accent); border-color: var(--accent); }
.track-rand-pct-btn { font-size: 0.52rem; }

/* TRACK INSTRUMENT SELECTOR */
.track-instrument-sel {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 3px;
  padding: 0.1rem 0.15rem;
  font-family: inherit;
  font-size: 0.62rem;
  font-weight: bold;
  cursor: pointer;
  min-width: 0;
  letter-spacing: 0.03em;
}
.track-instrument-sel:focus { outline: 1px solid var(--accent); }

/* ADD TRACK BUTTON */
.add-track-btn {
  margin: 0.4rem 0 0.2rem;
  padding: 0.35rem 1rem;
  border-radius: 4px;
  border: 1px dashed var(--border);
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  align-self: flex-start;
  transition: background 0.1s, color 0.1s, border-color 0.1s;
}
.add-track-btn:hover {
  background: var(--surface);
  color: var(--accent);
  border-color: var(--accent);
}

/* MODE BAR */
#mode-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.25rem 0.8rem;
  height: 2rem;
  flex-shrink: 0;
}

.mode-label {
  font-size: 0.58rem;
  color: var(--text-dim);
  letter-spacing: 0.12em;
  flex-shrink: 0;
}

.mode-btn {
  padding: 0.15rem 0.75rem;
  border-radius: 3px;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text-dim);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  transition: background 0.1s, color 0.1s, border-color 0.1s;
}
.mode-btn:hover { filter: brightness(1.35); }
.mode-btn[data-mode="note"].active  { background: #2a2a4a; border-color: #888; color: var(--text); }
.mode-btn[data-mode="prob"].active  { background: #4a3c00; border-color: #e6b800; color: #e6b800; }
.mode-btn[data-mode="tie"].active   { background: #1a3a7a; border-color: #4488ff; color: #aaccff; }
.mode-btn[data-mode="glide"].active { background: #7a3a10; border-color: #ff8844; color: #ffcc88; }

/* KEY / MODE SELECTORS in mode-bar */
.mode-sep {
  width: 1px;
  height: 1.1rem;
  background: var(--border);
  flex-shrink: 0;
}

.key-mode-sel {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 3px;
  padding: 0.1rem 0.25rem;
  font-family: inherit;
  font-size: 0.6rem;
  cursor: pointer;
  width: 2.8rem;
  flex-shrink: 0;
}
.key-mode-sel-wide { width: 6.5rem; }
.key-mode-sel:focus { outline: 1px solid var(--accent); }

/* PIANO — in-scale key highlighting */
.piano-wk.in-scale { background: #c8f0d0; }
.piano-wk.in-scale:hover { background: #a8dab8; }
.piano-wk.in-scale .wk-label { color: #2a7a3a; }
.piano-bk.in-scale { background: #1a5a2a; border-color: #2a7a3a; }
.piano-bk.in-scale:hover { background: #2a7a3a; }

/* SCALE RANDOMIZE BUTTON on synth tracks */
.track-rand-scale-btn { color: #8888ff; border-color: #3333aa; font-size: 0.7rem; }
.track-rand-scale-btn:hover { background: #1a1a5a !important; color: #aaaaff !important; border-color: #6666ff !important; }

/* Mode-specific step highlights */
.step-btn.mode-tie-on {
  background: #1a3a6a !important;
  border-color: #4488ff !important;
  opacity: 1 !important;
}
.step-btn.mode-glide-on {
  background: #6a3a10 !important;
  border-color: #ff8844 !important;
  opacity: 1 !important;
}

.step-btn.step-insertable {
  border: 1px dashed rgba(255,255,255,0.12);
}
.step-btn.step-insertable:hover {
  border-color: rgba(255,255,255,0.3);
  background: rgba(255,255,255,0.06);
}
.step-insert-hint {
  font-size: 0.6rem;
  color: rgba(255,255,255,0.18);
  pointer-events: none;
  position: relative;
  z-index: 1;
}
.step-btn.step-insertable:hover .step-insert-hint {
  color: rgba(255,255,255,0.45);
}

/* TIE / GLIDE BUTTONS in note picker */
.note-tg-row {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.6rem;
  padding: 0 0.7rem;
}

.note-tg-btn {
  flex: 1;
  padding: 0.35rem;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text-dim);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  transition: background 0.1s, color 0.1s, border-color 0.1s;
}
.note-tg-btn:hover { filter: brightness(1.35); }

#note-tie-btn.active {
  background: #1a3a7a;
  border-color: #4488ff;
  color: #aaccff;
}

#note-glide-btn.active {
  background: #7a3a10;
  border-color: #ff8844;
  color: #ffcc88;
}

/* T / G badges on step buttons */
.step-tg-badge {
  position: absolute;
  font-size: 0.36rem;
  line-height: 1;
  font-weight: bold;
  z-index: 3;
  pointer-events: none;
  top: 1px;
}
.step-tie-badge {
  left: 2px;
  color: #88aaff;
}
.step-glide-badge {
  right: 2px;
  color: #ffaa55;
  font-size: 0.5rem;
}

/* CHAIN NOW-PLAYING LABEL */
.chain-now-label {
  font-size: 0.58rem;
  font-weight: bold;
  color: #afffbf;
  background: #1a5a30;
  border: 1px solid #2aaa50;
  border-radius: 3px;
  padding: 0.08rem 0.45rem;
  letter-spacing: 0.06em;
  flex-shrink: 0;
  animation: chain-pulse 0.6s ease-in-out infinite alternate;
}
.chain-now-label.hidden { display: none; }

@keyframes chain-pulse {
  from { opacity: 0.65; }
  to   { opacity: 1; }
}

/* TRACK NAME LABEL */
.track-name-label {
  font-size: 0.62rem;
  font-weight: bold;
  color: var(--text);
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  width: 3.2rem;
  flex-shrink: 0;
  letter-spacing: 0.02em;
  user-select: none;
  transition: color 0.1s;
}
.track-name-label:hover { color: var(--accent); }

.track-rename-input {
  width: 3.2rem;
  background: var(--surface);
  border: 1px solid var(--accent);
  color: var(--text);
  border-radius: 2px;
  padding: 0.1rem 0.2rem;
  font-family: inherit;
  font-size: 0.6rem;
  font-weight: bold;
  outline: none;
  flex-shrink: 0;
}

/* MASTER OUTPUT TRACK */
.master-track-wrap {
  margin-bottom: 3px;
  border-bottom: 2px solid rgba(255,160,64,0.25);
  padding-bottom: 3px;
}

.master-track-row {
  background: #1a1000;
  border-color: rgba(255,160,64,0.35) !important;
}

.master-track-label {
  background: #221500;
  border-right-color: rgba(255,160,64,0.3) !important;
  gap: 0.5rem;
}

.master-track-title {
  font-size: 0.65rem;
  font-weight: bold;
  letter-spacing: 0.15em;
  color: #ffa040;
  flex: 1;
  cursor: default;
}
.master-track-title:hover { color: #ffa040; }

.master-vol {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0 0.8rem;
  border-right: none !important;
}

.master-vol-label {
  font-size: 0.55rem;
  color: #ccaa77;
  letter-spacing: 0.1em;
  flex-shrink: 0;
}

.master-vol-slider {
  flex: 1;
  height: 4px;
  accent-color: #ffa040;
  cursor: pointer;
}

.master-vol-val {
  font-size: 0.65rem;
  color: #ffa040;
  font-weight: bold;
  min-width: 2.5rem;
  text-align: right;
  flex-shrink: 0;
}

.master-panel {
  border-color: rgba(255,160,64,0.25) !important;
  background: #110a00 !important;
}

.master-panel.open {
  display: block;
}

.master-track-wrap.panel-open .master-track-row {
  border-radius: 4px 4px 0 0;
  border-bottom-color: rgba(255,160,64,0.15) !important;
}

.master-fx-lbl {
  color: #ffa040 !important;
  border-bottom-color: rgba(255,160,64,0.3) !important;
}

.master-fx-row {
  flex-wrap: wrap;
}

.master-knob-area {
  flex: 1;
}

.master-tp-viz {
  flex-shrink: 0;
}

.master-panel #settings-btn.active,
#master-settings-btn.active {
  background: #3a2a00;
  color: #ffa040;
  border-color: rgba(255,160,64,0.5);
}

/* ── SONGS BUTTONS ────────────────────────────────────────────────── */
.transport-sep {
  width: 1px;
  height: 1.4rem;
  background: var(--border);
  flex-shrink: 0;
}

.save-btn { border-color: #2a6a3a; }
.save-btn:hover { background: #1a4a2a !important; border-color: #3aaa5a; }
.save-btn.saved { background: #1a4a2a; border-color: #3aaa5a; color: #afffbf; }

.songs-btn { border-color: #2a4a7a; }
.songs-btn:hover { background: #1a3060 !important; border-color: #4a80cc; }

/* ── SONGS OVERLAY ────────────────────────────────────────────────── */
#songs-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
}
#songs-overlay.hidden { display: none; }

#songs-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  width: min(600px, 95vw);
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#songs-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

#songs-panel-title {
  font-size: 0.75rem;
  font-weight: bold;
  letter-spacing: 0.15em;
  color: var(--accent);
}

#songs-panel-close {
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 1rem;
  cursor: pointer;
  padding: 0 0.2rem;
}
#songs-panel-close:hover { color: var(--text); }

#songs-current-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.8rem;
  border-bottom: 1px solid var(--border);
  background: #0f1830;
  flex-shrink: 0;
  flex-wrap: wrap;
}

#songs-current-label {
  font-size: 0.65rem;
  color: var(--text-dim);
  white-space: nowrap;
}

#songs-name-input,
#songs-creator-input {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 4px;
  padding: 0.25rem 0.5rem;
  font-family: inherit;
  font-size: 0.72rem;
}
#songs-name-input { flex: 2; min-width: 100px; }
#songs-creator-input { flex: 1; min-width: 80px; }
#songs-name-input:focus,
#songs-creator-input:focus { outline: 1px solid var(--accent); }

.songs-action-btn {
  background: var(--surface2);
  border: 1px solid #3aaa5a;
  color: #afffbf;
  border-radius: 4px;
  padding: 0.25rem 0.7rem;
  font-family: inherit;
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: background 0.1s;
  white-space: nowrap;
}
.songs-action-btn:hover { background: #1a4a2a; }

#songs-list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.35rem 0.8rem;
  font-size: 0.62rem;
  color: var(--text-dim);
  letter-spacing: 0.08em;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.songs-sm-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  border-radius: 3px;
  padding: 0.1rem 0.4rem;
  font-family: inherit;
  font-size: 0.6rem;
  cursor: pointer;
}
.songs-sm-btn:hover { color: var(--text); border-color: #668; }

#songs-list {
  overflow-y: auto;
  flex: 1;
  padding: 0.3rem 0;
}
#songs-list::-webkit-scrollbar { width: 5px; }
#songs-list::-webkit-scrollbar-track { background: var(--bg); }
#songs-list::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

.songs-loading {
  padding: 1rem;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.72rem;
}

.song-row {
  display: flex;
  align-items: center;
  padding: 0.4rem 0.8rem;
  border-bottom: 1px solid #1a1a3a;
  gap: 0.6rem;
  transition: background 0.1s;
}
.song-row:hover { background: #1a2040; }
.song-row.song-current { background: #0d2030; border-left: 3px solid var(--accent); padding-left: 0.5rem; }

.song-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
}

.song-title {
  font-size: 0.75rem;
  font-weight: bold;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.song-meta {
  font-size: 0.6rem;
  color: var(--text-dim);
}

.song-actions {
  display: flex;
  gap: 0.4rem;
  flex-shrink: 0;
}

/* ── TOOLTIP ──────────────────────────────────────────────────────── */
#gb-tooltip {
  position: fixed;
  background: #0a1220;
  border: 1px solid #4466cc;
  color: #aaccff;
  border-radius: 3px;
  padding: 0.18rem 0.5rem;
  font-family: 'Courier New', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.05em;
  pointer-events: none;
  z-index: 9999;
  opacity: 0;
  transition: opacity 0.1s;
  white-space: nowrap;
  box-shadow: 0 2px 8px rgba(0,0,0,0.4);
}
#gb-tooltip.visible { opacity: 1; }

/* ── RATCHET BADGE on step buttons ───────────────────────────────── */
.step-ratchet-badge {
  position: absolute;
  font-size: 0.34rem;
  line-height: 1;
  font-weight: bold;
  z-index: 3;
  pointer-events: none;
  bottom: 1px;
  right: 2px;
  color: #ffdd44;
  text-shadow: 0 0 3px rgba(0,0,0,0.8);
}

/* ── NOTE RATCHET ROW in note picker ─────────────────────────────── */
.note-ratchet-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.6rem;
  padding: 0 0.7rem;
}

/* ── DELAY SYNC CONTROLS in FX panels ────────────────────────────── */
.tp-delay-sync-row {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  margin-top: 0.2rem;
}

.tp-delay-sync-lbl {
  font-size: 0.44rem;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  flex-shrink: 0;
}

.tp-sync-sel {
  flex: 1;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 3px;
  padding: 0.1rem 0.2rem;
  font-family: inherit;
  font-size: 0.56rem;
  cursor: pointer;
}
.tp-sync-sel.synced {
  border-color: #4488ff;
  color: #aaccff;
}

/* ── TOAST ────────────────────────────────────────────────────────── */
#gb-toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%) translateY(2rem);
  background: #1a3a2a;
  border: 1px solid #3aaa5a;
  color: #afffbf;
  border-radius: 4px;
  padding: 0.4rem 1rem;
  font-family: 'Courier New', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  opacity: 0;
  transition: opacity 0.2s, transform 0.2s;
  pointer-events: none;
  z-index: 999;
}
#gb-toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ── NOTE PICKER NAV BUTTONS ──────────────────────────────────────── */
.note-picker-nav {
  display: flex;
  gap: 0.4rem;
  padding: 0.5rem 0.7rem 0.7rem;
  border-top: 1px solid var(--border);
  margin-top: 0.4rem;
}

.note-nav-btn {
  flex: 1;
  padding: 0.35rem 0.4rem;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.65rem;
  letter-spacing: 0.05em;
  transition: background 0.1s, border-color 0.1s;
}
.note-nav-btn:hover { background: #1a3a70; border-color: #4466cc; }

.note-step-btn {
  border-color: #1a6a3a;
  color: #66ffaa;
  font-weight: bold;
}
.note-step-btn:hover { background: #0a4a28 !important; border-color: #22bb66 !important; }

.note-skip-btn {
  border-color: #6a2a2a;
  color: #ff9999;
}
.note-skip-btn:hover { background: #5a1010 !important; border-color: #aa3333 !important; }

/* ── OCTAVE CONTROLS ──────────────────────────────────────────────── */
#octave-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.3rem 0.7rem;
  background: var(--surface2);
  border-bottom: 1px solid var(--border);
}

#octave-range-label {
  font-size: 0.65rem;
  color: var(--text-dim);
  letter-spacing: 0.08em;
}

.oct-btn {
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.65rem;
  letter-spacing: 0.05em;
  transition: background 0.1s, border-color 0.1s;
}
.oct-btn:hover { background: #1a3a70; border-color: #4466cc; }
.oct-btn:disabled { opacity: 0.35; cursor: not-allowed; }

/* ── DUPLICATE PATTERN BUTTON ─────────────────────────────────────── */
.pat-dup-btn {
  border-color: #2a5a7a;
  color: #88ccff;
}
.pat-dup-btn:hover { background: #1a3a5a !important; border-color: #4488cc; }

/* ── EUCLIDEAN SEQUENCER PANEL ────────────────────────────────────── */
.tp-eucl-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 0.35rem;
}

.tp-eucl-toggle {
  flex: 1;
  padding: 0.3rem 0.6rem;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text-dim);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  transition: background 0.1s, border-color 0.1s, color 0.1s;
}
.tp-eucl-toggle:hover { filter: brightness(1.3); }
.tp-eucl-toggle.active {
  background: #1a5a30;
  border-color: #2aaa50;
  color: #afffbf;
}

.tp-eucl-param-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 0.3rem;
}

.tp-eucl-param-lbl {
  font-size: 0.5rem;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  width: 3.2rem;
  flex-shrink: 0;
}

.tp-eucl-slider {
  flex: 1;
  height: 4px;
  accent-color: var(--accent);
  cursor: pointer;
}

.tp-eucl-param-val {
  font-size: 0.65rem;
  color: var(--text);
  min-width: 1.8rem;
  text-align: right;
  font-weight: bold;
}

.tp-eucl-preview {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
  padding: 0.3rem;
  background: #0a1020;
  border-radius: 4px;
  border: 1px solid #1a2a4a;
  min-height: 1.4rem;
  margin-bottom: 0.35rem;
}

.tp-eucl-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #1a2a4a;
  border: 1px solid #2a3a5a;
  transition: background 0.1s, border-color 0.1s;
}

.tp-eucl-dot.on {
  background: #e94560;
  border-color: #ff6080;
  box-shadow: 0 0 4px rgba(233,69,96,0.4);
}

.tp-eucl-apply-row {
  display: flex;
  gap: 0.4rem;
  margin-top: 0.2rem;
}

.tp-eucl-apply {
  flex: 2;
  padding: 0.35rem 0.5rem;
  border-radius: 4px;
  border: 1px solid #2aaa50;
  background: #1a4a2a;
  color: #afffbf;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.6rem;
  letter-spacing: 0.06em;
  transition: background 0.1s;
}
.tp-eucl-apply:hover { background: #2a6a3a; }

.tp-eucl-fill {
  flex: 1;
  padding: 0.35rem 0.4rem;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text-dim);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.55rem;
  letter-spacing: 0.04em;
  transition: background 0.1s;
}
.tp-eucl-fill:hover { background: #1a3a70; color: var(--text); }