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

:root {
  /* ── Foundation ── */
  --bg-app:             #08090A;   /* body, mode-btn-area */
  --bg-editor:          #1A1E20;   /* piano-roll-area */
  --bg-sidebar:         #141719;   /* track-label, ruler-area */
  --bg-toolbar:         #111315;   /* toolbar */
  --bg-elevated:        #181B1D;   /* kit popup */
  --bg-surface:         #151819;   /* track-area, mode-btn */
  --bg-base:            #202426;   /* buttons, step cells, inputs, bar-action */
  --bg-hover:           #2A3033;   /* hover state (controls); secondary border use */
  --bg-hover-strong:    #343B3F;   /* toolbar btn hover; kit popup border */

  --step-bg-top:        #8E9799;   /* step cell idle gradient top */
  --step-bg-bottom:     #626A6E;   /* step cell idle gradient bottom */
  --step-border:        #B2BCC0;   /* step cell idle border */

  /* ── Text ── */
  --text-primary:       #ccc;
  --text-secondary:     #bbb;
  --text-inactive:      #888;      /* toolbar labels, step divider */
  --text-muted:         #666;      /* filenames, kit popup title, sample-filename */
  --text-step-num:      #555;
  --text-ghost:         #444;      /* empty placeholders, kit-preset--empty */
  --text-dim:           #777;      /* mode-btn inactive */
  --text-white:         #fff;

  /* ── Borders ── */
  --border-strong:      #555;      /* toolbar btn, number inputs */
  --border-mid:         #444;      /* step cells, pads, bar-action-btn */
  --border-subtle:      #333;      /* toolbar bottom, row separators, bottom-panel top */
  --border-faint:       #2e2e2e;   /* track-row, bottom-row inner separators */
  --border-kit-hover:   #5a5a5a;   /* kit-preset:hover border */

  /* ── Accent ── */
  --accent:             #4a7fa5;
  --accent-border:      #6aafd6;
  --accent-deep:        #1e2d3d;   /* mode-btn.active bg */
  --accent-deep-border: #3a6a8a;   /* mode-btn.active border */
  --accent-bright:      #7acbf5;   /* step.on.playing bg */

  /* ── States ── */
  --playing:            #e8e8e8;   /* playhead, step.playing border */
  --playing-bg:         #4A7FA5;   /* pad.playing-now bg — blue flash */
  --playing-border:     #7ACBF5;   /* pad.playing-now border — bright blue */

  /* ── Pads ── */
  --pad-text:           #6E7A7E;   /* pad label — embedded in material */
  --pad-empty-text:     #444C4F;   /* empty pad label — barely visible */
  --pad-bg-top:         #4B5254;   /* pad resting gradient top */
  --pad-bg-bottom:      #313637;   /* pad resting gradient bottom */
  --pad-border:         #565E60;   /* pad resting border */
  --pad-empty-bg-top:   #2B2F31;   /* empty pad gradient top */
  --pad-empty-bg-bottom:#1C1F20;   /* empty pad gradient bottom */
  --pad-empty-border:   #393E40;   /* empty pad border */
  --pad-active-border:  rgba(195,208,212,0.85); /* selected pad — neutral steel frame */

  /* ── Radius ── */
  --radius-sm:          3px;       /* step cells */
  --radius:             4px;       /* buttons, inputs, bar-action, kit-preset */
  --radius-md:          6px;       /* pads */
  --radius-lg:          8px;       /* kit popup */
}

html {
  height: 100%;
  overflow: hidden;
}

body {
  background: var(--bg-app);
  color: var(--text-primary);
  font-family: system-ui, sans-serif;
  font-size: 13px;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  touch-action: manipulation;
}

body.standalone-active {
  height: var(--real-vh, 100dvh);
}

body.standalone-active .arrangement { flex: 1; }

body.standalone-active #track1-row,
body.standalone-active #track2-row,
body.standalone-active #track3-row,
body.standalone-active #track4-row {
  height: 36px;
}

body.standalone-active .toolbar button,
body.standalone-active .bpm-pill {
  height: 32px;
  box-sizing: border-box;
}

body.standalone-active .bpm-pill {
  align-items: center;
}

body.standalone-active .bar-actions-row { height: 36px; }

body.standalone-active .bar-action-btn {
  height: 28px;
  padding: 0 7px;
  box-sizing: border-box;
}

body.standalone-active .mode-switch-row {
  height: calc(56px + env(safe-area-inset-bottom, 0px));
}

body.standalone-active .mode-btn-area {
  padding-top: 8px;
  padding-bottom: 8px;
}

body.standalone-active .pad-mode-row { height: 36px; }

body.standalone-active .step-seq-row  { height: 108px; }
body.standalone-active .pads-row      { height: 210px; }

body.standalone-active:not(.mix-active):not(.keys-active) .arrangement   { flex: none; }
body.standalone-active:not(.mix-active):not(.keys-active) .bottom-panel  { flex: 1; }
body.standalone-active:not(.mix-active):not(.keys-active) .pad-controls-row {
  height: 112px;
  padding: 8px 0;
  margin-top: auto;
}

body.standalone-active .pad-mode-row #btn-kit,
body.standalone-active .pad-mode-row #btn-weak,
body.standalone-active .pad-mode-row #btn-nudge {
  height: 28px;
}

body.standalone-active .pad-mode-row #btn-kit {
  margin-left: 0;
  width: 76px;
  flex-direction: row;
  gap: 4px;
}

body.standalone-active .pad-mode-row #btn-kit::before {
  align-self: center;
  margin-left: 0;
}

body.standalone-active .pad-mode-row #btn-nudge {
  margin-right: 0;
}

body.standalone-active .piano-roll-controls #btn-load-sample,
body.standalone-active .piano-roll-controls #btn-chord,
body.standalone-active .piano-roll-controls #btn-move,
body.standalone-active .piano-roll-controls #btn-piano-hzoom,
body.standalone-active .piano-roll-controls .piano-range-btn {
  height: 28px;
}

/* Toolbar */

.toolbar {
  display: flex;
  align-items: center;
  padding: calc(8px + env(safe-area-inset-top, 0px)) 0 8px 0;
  background: var(--bg-toolbar);
  border-bottom: 1px solid var(--border-subtle);
  flex-shrink: 0;
}

.toolbar-menu-zone {
  width: 60px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.toolbar-main {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 12px 0 0;
  min-width: 0;
  overflow-x: auto;
}

.toolbar-main button {
  min-width: 58px;
  text-align: center;
}

.toolbar button {
  background: var(--bg-hover);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 4px 10px;
  cursor: pointer;
  font-size: 12px;
}

#btn-proj-menu {
  background: var(--bg-base);
  border-color: var(--border-strong);
}

.toolbar button:hover:not(:disabled) {
  background: var(--bg-hover-strong);
}

.toolbar button:disabled {
  opacity: 0.4;
  cursor: default;
}

.toolbar button.active {
  background: var(--accent);
  border-color: var(--accent-border);
  color: var(--text-white);
}

.toolbar label {
  color: var(--text-inactive);
}

.bpm-pill {
  display: flex;
  align-items: baseline;
  gap: 3px;
  background: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 2px 7px;
  margin-left: auto;
}

.bpm-pill input[type="number"] {
  width: 38px;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 13px;
  font-weight: 500;
  text-align: right;
  padding: 0;
  -moz-appearance: textfield;
}

.bpm-pill input[type="number"]::-webkit-inner-spin-button,
.bpm-pill input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
}

.bpm-pill label {
  color: var(--text-inactive);
  font-size: 9px;
  cursor: pointer;
}

#btn-proj-menu {
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

#proj-menu {
  position: fixed;
  top: auto;
  left: 4px;
  background: rgba(22, 26, 29, 0.52);
  -webkit-backdrop-filter: blur(24px) saturate(160%);
  backdrop-filter: blur(24px) saturate(160%);
  border: 1px solid rgba(255, 255, 255, 0.10);
  border-radius: 12px;
  padding: 5px;
  z-index: 200;
  min-width: 170px;
  box-shadow:
    0 24px 48px rgba(0, 0, 0, 0.65),
    0 6px 16px rgba(0, 0, 0, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.07);
  display: flex;
  flex-direction: column;
  gap: 2px;
}
#proj-menu[hidden] { display: none; }

#proj-menu button {
  width: 100%;
  background: transparent;
  border: none;
  border-radius: 8px;
  color: rgba(215, 225, 230, 0.92);
  font-size: 14px;
  padding: 0 14px;
  height: 44px;
  display: flex;
  align-items: center;
  text-align: left;
  cursor: pointer;
  letter-spacing: 0.01em;
}

#proj-menu button:hover {
  background: rgba(255, 255, 255, 0.09);
  color: #fff;
}

#proj-menu button:active {
  background: rgba(255, 255, 255, 0.14);
}

#proj-menu button + button {
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 0 0 8px 8px;
}

#proj-menu button:first-of-type {
  border-radius: 8px 8px 0 0;
}


/* Arrangement */

.arrangement {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Rows */

.ruler-row,
.track-row {
  display: flex;
  align-items: stretch;
}

.ruler-row {
  height: 24px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--border-subtle);
}

.track-row {
  height: 80px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--border-faint);
}

/* Track labels */

.track-label {
  width: 60px;
  flex-shrink: 0;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 6px 6px;
  gap: 2px;
}

.track-title {
  color: var(--text-secondary);
  font-weight: 500;
}

.track-filename {
  color: var(--text-muted);
  font-size: 10px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  width: 100%;
}

/* Ruler area */

.ruler-area {
  flex: 1;
  overflow: hidden;
  background: var(--bg-sidebar);
}

#ruler-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* Loop Strip */

.loop-strip-row {
  display: flex;
  align-items: stretch;
  height: 10px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--border-faint);
}

.loop-strip-area {
  flex: 1;
  overflow: hidden;
  background: var(--bg-surface);
  position: relative;
}

#loop-strip-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* Track area */

.track-area {
  flex: 1;
  position: relative;
  background: var(--bg-surface);
  overflow: hidden;
}

.ruler-area,
.loop-strip-area,
#track1-area,
#track2-area,
#track3-area,
#track4-area {
  touch-action: none;
  -webkit-touch-callout: none;
  user-select: none;
  -webkit-user-select: none;
}

.track-area--empty {
  display: flex;
  align-items: center;
  padding-left: 14px;
  border: 1px dashed var(--border-subtle);
  border-left: none;
}

.track-placeholder {
  color: var(--text-ghost);
  font-size: 11px;
  font-style: italic;
}

/* Waveform canvas */

#waveform-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* Playhead */

#playhead {
  position: absolute;
  top: 0;
  left: 0;
  width: 1px;
  height: 100%;
  background: var(--playing);
  pointer-events: none;
  display: none;
}

/* Track 2 — увеличенная высота для overview */

#track1-row { height: 60px; }
#track2-row { height: 60px; }
#track3-row { height: 60px; }
#track4-row { height: 60px; }

#track3-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

#track2-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

#track4-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* ── Track label — action controls ─────────────────────────────── */
.track-label--action {
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  align-items: center;
  justify-content: center;
  padding: 2px;
}
.track-label--action:active { background: rgba(255,255,255,0.03); }
.arrangement--compact .track-label--action { padding: 2px 4px; }
@media (hover: hover) and (pointer: fine) {
  .track-label--action:hover .track-action-pill { border-color: rgba(255,255,255,0.18); }
}

/* ── Track action pill ──────────────────────────────────────────── */
.track-action-pill {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 3px;
  padding: 4px 4px;
  border-radius: 4px;
  background: var(--bg-base);
  border: 1px solid var(--border-mid);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.03em;
  white-space: nowrap;
  width: 100%;
  height: 100%;
  box-sizing: border-box;
}
.arrangement--compact .track-action-pill { padding: 1px 4px; font-size: 9px; }

/* ── Rec label — Track 4 ─────────────────────────────────────────── */
.rec-dot {
  font-size: 8px;
  line-height: 1;
  color: rgba(175,65,65,0.80);
}
.rec-text {
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.02em;
}
#track4-rec-label[data-rec-state="armed"] .rec-dot   { color: rgba(180,140,60,0.85); }
#track4-rec-label[data-rec-state="armed"] .rec-text  { color: rgba(195,205,210,0.75); }
#track4-rec-label[data-rec-state="count-in"] .rec-dot   { color: rgba(200,80,80,0.95); }
#track4-rec-label[data-rec-state="count-in"] .rec-text  { color: rgba(200,210,215,0.85); }
#track4-rec-label[data-rec-state="recording"] .rec-dot  { color: rgba(210,80,80,1.0); }
#track4-rec-label[data-rec-state="recording"] .rec-text { color: rgba(218,224,228,0.88); }
#track4-rec-label[data-rec-state="mic-checking"] .rec-dot  { color: rgba(180,160,70,0.85); }
#track4-rec-label[data-rec-state="mic-checking"] .rec-text { color: rgba(195,205,210,0.75); }
#track4-rec-label[data-rec-state="mic-ready"] .rec-dot  { color: rgba(175,190,195,0.95); }
#track4-rec-label[data-rec-state="mic-ready"] .rec-text { color: rgba(215,224,228,0.88); }
#track4-rec-label[data-rec-state="mic-denied"] .rec-dot  { color: rgba(210,75,55,0.90); }
#track4-rec-label[data-rec-state="mic-denied"] .rec-text { color: rgba(210,195,195,0.80); }
#track4-rec-label[data-rec-state="armed"] .track-action-pill        { border-color: rgba(180,140,60,0.30); }
#track4-rec-label[data-rec-state="mic-checking"] .track-action-pill { border-color: rgba(180,160,70,0.28); }
#track4-rec-label[data-rec-state="mic-ready"] .track-action-pill    { border-color: rgba(175,190,195,0.30); }
#track4-rec-label[data-rec-state="mic-denied"] .track-action-pill   { border-color: rgba(200,80,80,0.40); }
#track4-rec-label[data-rec-state="count-in"] .track-action-pill     { border-color: rgba(200,80,80,0.48); }
#track4-rec-label[data-rec-state="recording"] .track-action-pill    { border-color: rgba(200,80,80,0.58); background: rgba(200,80,80,0.07); }
.arrangement--compact #track4-rec-label .rec-dot  { font-size: 6px; }
.arrangement--compact #track4-rec-label .rec-text { font-size: 9px; }

/* ── Load label — Track 1 ───────────────────────────────────────── */
.track-action-pill--load { color: var(--text-secondary); }
#track1-load-label .track-filename { display: none; }

/* ── Compact arrangement — visual-only ──────────────────────────── */
.arrangement--compact #track1-area,
.arrangement--compact #track2-area,
.arrangement--compact #track3-area,
.arrangement--compact #track4-area {
  display: flex;
  align-items: center;
}

.arrangement--compact #waveform-canvas,
.arrangement--compact #track2-canvas,
.arrangement--compact #track3-canvas,
.arrangement--compact #track4-canvas {
  height: 20px;
}

.arrangement--compact #track1-row { height: 20px; }
.arrangement--compact #track2-row { height: 20px; }
.arrangement--compact #track3-row { height: 20px; }
.arrangement--compact #track4-row { height: 20px; }

#compact-toggle { cursor: pointer; user-select: none; -webkit-user-select: none; }

/* Bottom panel */

.bottom-panel {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border-subtle);
}

body.mix-active .arrangement   { flex: none; }
body.mix-active .bottom-panel  { flex: 1; }
body.keys-active .arrangement  { flex: 1; }

.bottom-row {
  display: flex;
  align-items: stretch;
  border-bottom: 1px solid var(--border-faint);
  flex-shrink: 0;
}

.bar-actions-row   { height: 36px; border-bottom: none; }
.step-seq-row      { height: 120px; }
.pad-mode-row      { height: 36px; }
.pad-controls-row  { height: 60px; }
.pads-row          { height: 220px; }

#pad-controls-canvas {
  flex: 1;
  min-width: 0;
  min-height: 0;
  display: block;
  width: auto;
  height: auto;
  touch-action: none;
  -webkit-touch-callout: none;
  user-select: none;
  -webkit-user-select: none;
}

.bar-actions-area {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 8px;
}

.bar-action-btn {
  background: var(--bg-base);
  border: 1px solid var(--border-mid);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 11px;
  padding: 4px 10px;
  cursor: pointer;
}

#btn-duplicate, #btn-copy, #btn-paste, #btn-clear {
  flex: 1;
  text-align: center;
}

#btn-loop-prev, #btn-loop-next {
  flex: 0.5;
  text-align: center;
}
.bar-action-btn:hover:not(:disabled) { background: var(--bg-hover); }
.bar-action-btn:disabled { opacity: 0.35; cursor: default; }

.step-seq-section {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(2, 1fr);
  gap: 4px;
  padding: 8px;
  overflow: hidden;
  -webkit-touch-callout: none;
  user-select: none;
  -webkit-user-select: none;
}

.drum-pads-section {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(4, 1fr);
  gap: 6px;
  padding: 8px;
  -webkit-touch-callout: none;
  user-select: none;
  -webkit-user-select: none;
}

/* Step cells — 4 состояния */

.step {
  position: relative;
  background: linear-gradient(180deg, var(--step-bg-top), var(--step-bg-bottom));
  border: 1px solid var(--step-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  padding: 2px;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.35),
    inset 0 -1px 0 rgba(0,0,0,0.25),
    0 1px 2px rgba(0,0,0,0.45);
}
.step.on         { background: var(--accent); border-color: var(--accent-border); }
.step.playing    { border-color: var(--playing); box-shadow: inset 0 0 0 1px var(--playing); }
.step.on.playing { background: var(--accent-bright); border-color: var(--playing); }
.step.nudge-selected {
  outline: 2px solid rgba(255,255,255,0.85);
  outline-offset: -2px;
}
.nudge-bar {
  position: absolute;
  bottom: 3px;
  height: 4px;
  background: rgba(200,220,230,0.80);
  border-radius: 1px;
  pointer-events: none;
}

@media (hover: hover) and (pointer: fine) {
  .step:hover { background: var(--bg-hover); }
}

.step-num {
  font-size: 9px;
  color: var(--text-step-num);
  pointer-events: none;
  line-height: 1;
}

/* Drum pads */

.pad {
  background: linear-gradient(180deg, var(--pad-bg-top), var(--pad-bg-bottom));
  border: 1px solid var(--pad-border);
  border-radius: var(--radius-md);
  color: var(--pad-text);
  cursor: pointer;
  font-size: 10px;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.11),
    inset 0 -2px 0 rgba(0,0,0,0.55),
    0 3px 7px rgba(0,0,0,0.7),
    0 1px 3px rgba(0,0,0,0.4);
}
.pad.empty { background: linear-gradient(180deg, var(--pad-empty-bg-top), var(--pad-empty-bg-bottom)); border-color: var(--pad-empty-border); color: var(--pad-empty-text); }
.pad:hover                { background: var(--bg-hover); }
.pad.has-steps            { border-color: var(--pad-border); color: rgba(210,220,224,0.90); text-shadow: 0 0 5px rgba(200,215,222,0.65), 0 0 10px rgba(180,200,210,0.28); }
.pad.active               { background: linear-gradient(180deg, var(--pad-bg-top), var(--pad-bg-bottom)); border-color: var(--pad-active-border); box-shadow: inset 0 0 0 1px rgba(255,255,255,0.14), inset 0 1px 0 rgba(255,255,255,0.11), inset 0 -2px 0 rgba(0,0,0,0.55), 0 3px 7px rgba(0,0,0,0.7), 0 1px 3px rgba(0,0,0,0.4); }
.pad.active.has-steps     { background: linear-gradient(180deg, var(--pad-bg-top), var(--pad-bg-bottom)); border-color: var(--pad-active-border); box-shadow: inset 0 0 0 1px rgba(255,255,255,0.14), inset 0 1px 0 rgba(255,255,255,0.11), inset 0 -2px 0 rgba(0,0,0,0.55), 0 3px 7px rgba(0,0,0,0.7), 0 1px 3px rgba(0,0,0,0.4); }
.pad.playing-now,
.pad.active.playing-now   { background: var(--playing-bg); border-color: var(--playing-border); box-shadow: 0 0 8px rgba(122,203,245,0.5); }

/* Pad mode row — separate row above knobs */

.pad-mode-row {
  align-items: center;
  gap: 6px;
  padding: 0 7px;
}

.pad-mode-row #btn-kit {
  margin-left: 0;
  flex-shrink: 0;
  width: 76px;
  height: 26px;
  background: linear-gradient(180deg, #262C2E, #1A2022);
  border: 1px solid #363D40;
  border-top-color: #4A5255;
  border-radius: var(--radius);
  color: rgba(105, 115, 120, 0.90);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  gap: 4px;
  box-shadow:
    0 1px 0 rgba(255,255,255,0.06),
    inset 0 1px 0 rgba(255,255,255,0.16),
    inset 0 -2px 0 rgba(0,0,0,0.42),
    0 3px 6px rgba(0,0,0,0.48);
  text-shadow: 0 1px 2px rgba(0,0,0,0.55);
  transition: background 0.08s, color 0.08s, border-color 0.08s;
}
.pad-mode-row #btn-kit::before {
  content: 'PACK ▼';
  font-size: 8px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: rgba(118, 128, 132, 0.68);
  text-shadow: none;
  line-height: 1;
  align-self: center;
  margin-left: 0;
}
.pad-mode-row #btn-kit:hover {
  border-color: #4A5255;
  border-top-color: #5A6468;
  color: rgba(130, 140, 145, 0.98);
}
.pad-mode-row #btn-kit:active {
  background: linear-gradient(180deg, #2A3032, #1E2426);
  box-shadow: inset 0 2px 5px rgba(0,0,0,0.55), inset 0 1px 0 rgba(0,0,0,0.25), 0 1px 3px rgba(0,0,0,0.35);
}

.pad-mode-row #btn-nudge {
  margin-right: 0;
  flex-shrink: 0;
  width: 44px;
  height: 26px;
  background: linear-gradient(180deg, #262C2E, #1A2022);
  border: 1px solid #363D40;
  border-top-color: #4A5255;
  border-radius: var(--radius);
  color: rgba(105,115,120,0.90);
  font-size: 10px;
  font-weight: 600;
  cursor: pointer;
  box-shadow:
    0 1px 0 rgba(255,255,255,0.06),
    inset 0 1px 0 rgba(255,255,255,0.16),
    inset 0 -2px 0 rgba(0,0,0,0.42),
    0 3px 6px rgba(0,0,0,0.48);
  transition: background 0.08s, color 0.08s, border-color 0.08s;
}
.pad-mode-row #btn-nudge.active {
  background: linear-gradient(180deg, #262C2E, #1A2022);
  border-color: #4A5255;
  color: rgba(215,228,232,0.98);
  text-shadow: 0 0 6px rgba(195,215,220,0.70), 0 0 12px rgba(195,215,220,0.35);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.30),
    inset 0 -2px 0 rgba(0,0,0,0.50),
    0 0 8px rgba(195,210,215,0.30),
    0 3px 6px rgba(0,0,0,0.48);
}
.pad-mode-row #btn-weak {
  margin-left: auto;
  flex-shrink: 0;
  width: 44px;
  height: 26px;
  background: linear-gradient(180deg, #262C2E, #1A2022);
  border: 1px solid #363D40;
  border-top-color: #4A5255;
  border-radius: var(--radius);
  color: rgba(105,115,120,0.90);
  font-size: 10px;
  font-weight: 600;
  cursor: pointer;
  box-shadow:
    0 1px 0 rgba(255,255,255,0.06),
    inset 0 1px 0 rgba(255,255,255,0.16),
    inset 0 -2px 0 rgba(0,0,0,0.42),
    0 3px 6px rgba(0,0,0,0.48);
  transition: background 0.08s, color 0.08s, border-color 0.08s;
}
.pad-mode-row #btn-weak.active {
  background: linear-gradient(180deg, #262C2E, #1A2022);
  border-color: #4A5255;
  color: rgba(215,228,232,0.98);
  text-shadow: 0 0 6px rgba(195,215,220,0.70), 0 0 12px rgba(195,215,220,0.35);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.30),
    inset 0 -2px 0 rgba(0,0,0,0.50),
    0 0 8px rgba(195,210,215,0.30),
    0 3px 6px rgba(0,0,0,0.48);
}
.step.on.weak {
  opacity: 0.5;
}

/* Kit popup */

.kit-popup {
  display: none;
  position: fixed;
  background: rgba(22, 26, 29, 0.52);
  -webkit-backdrop-filter: blur(24px) saturate(160%);
  backdrop-filter: blur(24px) saturate(160%);
  border: 1px solid rgba(255, 255, 255, 0.10);
  border-radius: 12px;
  padding: 5px;
  z-index: 200;
  min-width: 120px;
  box-shadow:
    0 24px 48px rgba(0,0,0,0.65),
    0 6px 16px rgba(0,0,0,0.45),
    inset 0 1px 0 rgba(255,255,255,0.07);
}
.kit-popup.open { display: flex; flex-direction: column; gap: 2px; }

.kit-popup-title { display: none; }

.kit-preset {
  background: transparent;
  border: none;
  border-radius: 8px;
  color: rgba(215, 225, 230, 0.92);
  font-size: 14px;
  font-weight: 600;
  padding: 0 14px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  cursor: pointer;
  letter-spacing: 0.01em;
  transition: background 0.08s, color 0.08s;
}
.kit-preset + .kit-preset {
  border-top: 1px solid rgba(255,255,255,0.07);
  border-radius: 0 0 8px 8px;
}
.kit-preset:first-of-type { border-radius: 8px 8px 0 0; }
.kit-preset:hover { background: rgba(255,255,255,0.09); color: #fff; }
.kit-preset:active { background: rgba(255,255,255,0.14); }
.kit-preset--active {
  color: rgba(232, 238, 240, 0.95);
  background: rgba(255,255,255,0.06);
}
.kit-preset--empty {
  opacity: 0.32;
  cursor: default;
}
.kit-preset--empty:hover { background: transparent; }

.kit-user-section { border-bottom: 1px solid rgba(255,255,255,0.1); margin-bottom: 4px; padding-bottom: 4px; }
.kit-user-row { display: flex; align-items: center; gap: 4px; }
.kit-user-row .kit-preset { flex: 1; }
.kit-delete-btn { background: transparent; border: none; color: rgba(255,255,255,0.4); font-size: 12px; padding: 4px 6px; cursor: pointer; border-radius: 4px; }
.kit-delete-btn:hover { color: #ff6b6b; background: rgba(255,100,100,0.1); }
.kit-import-btn { width: 100%; background: transparent; border: 1px dashed rgba(255,255,255,0.25); color: rgba(255,255,255,0.6); border-radius: 6px; padding: 7px; margin-top: 4px; cursor: pointer; font-size: 13px; }
.kit-import-btn:hover { border-color: rgba(255,255,255,0.5); color: #fff; }

/* Piano Roll */

.piano-roll-row {
  flex: 1;
  display: flex;
  min-height: 200px;
  border-top: 1px solid var(--border-faint);
  border-bottom: 1px solid var(--border-faint);
}

.piano-roll-area {
  flex: 1;
  position: relative;
  background: var(--bg-editor);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

#piano-roll-canvas {
  flex: 1;
  display: block;
  width: 100%;
  touch-action: none;
  -webkit-touch-callout: none;
  user-select: none;
  -webkit-user-select: none;
}

.piano-roll-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  min-width: 0;
  background: var(--bg-app);
  border-bottom: 1px solid var(--border-faint);
}

.piano-roll-controls #btn-load-sample,
.piano-roll-controls #btn-chord,
.piano-roll-controls #btn-move,
.piano-roll-controls #btn-piano-hzoom,
.piano-roll-controls .piano-range-btn {
  height: 26px;
  padding: 0 8px;
  background: linear-gradient(180deg, #262C2E, #1A2022);
  border: 1px solid #363D40;
  border-top-color: #4A5255;
  border-radius: var(--radius);
  color: rgba(105,115,120,0.90);
  font-size: 10px;
  font-weight: 600;
  cursor: pointer;
  box-shadow:
    0 1px 0 rgba(255,255,255,0.06),
    inset 0 1px 0 rgba(255,255,255,0.16),
    inset 0 -2px 0 rgba(0,0,0,0.42),
    0 3px 6px rgba(0,0,0,0.48);
  transition: background 0.08s, color 0.08s, border-color 0.08s;
}
@media (hover: hover) and (pointer: fine) {
  .piano-roll-controls #btn-load-sample:hover,
  .piano-roll-controls #btn-chord:hover,
  .piano-roll-controls #btn-move:hover,
  .piano-roll-controls #btn-piano-hzoom:hover,
  .piano-roll-controls .piano-range-btn:hover {
    border-color: #4A5255;
    border-top-color: #5A6468;
    color: rgba(130,140,145,0.98);
  }
}
.piano-roll-controls #btn-load-sample:active,
.piano-roll-controls #btn-chord:active,
.piano-roll-controls #btn-move:active,
.piano-roll-controls #btn-piano-hzoom:active,
.piano-roll-controls .piano-range-btn:active {
  background: linear-gradient(180deg, #2A3032, #1E2426);
  box-shadow: inset 0 2px 5px rgba(0,0,0,0.55), inset 0 1px 0 rgba(0,0,0,0.25), 0 1px 3px rgba(0,0,0,0.35);
}
.piano-roll-controls #btn-piano-hzoom.active,
.piano-roll-controls #btn-chord.active,
.piano-roll-controls #btn-move.active {
  border-color: #4A5255;
  color: rgba(215,228,232,0.98);
  text-shadow: 0 0 6px rgba(195,215,220,0.70), 0 0 12px rgba(195,215,220,0.35);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.30),
    inset 0 -2px 0 rgba(0,0,0,0.50),
    0 0 8px rgba(195,210,215,0.30),
    0 3px 6px rgba(0,0,0,0.48);
}

#sample-filename {
  flex: 1;
  color: var(--text-muted);
  font-size: 11px;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.piano-roll-controls #btn-load-sample {
  width: 76px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.piano-roll-controls #btn-chord {
  width: 44px;
  padding: 0;
}
.piano-roll-controls #btn-move {
  width: 44px;
  padding: 0;
}
.piano-roll-controls #btn-piano-hzoom {
  width: 44px;
}
.piano-range-controls {
  display: flex;
  align-items: center;
  gap: 6px;
}


.piano-range-btn {
  min-width: 22px;
  padding: 0 4px;
}

/* Mixer */

.mixer-row {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  border-bottom: 1px solid var(--border-faint);
}

.mixer-placeholder {
  color: var(--text-muted);
  font-size: 13px;
  letter-spacing: 0.05em;
}

.mixer-channels {
  display: flex;
  width: 100%;
  height: 100%;
  gap: 6px;
  -webkit-touch-callout: none;
  user-select: none;
  -webkit-user-select: none;
  padding: 10px 8px 8px;
  box-sizing: border-box;
  touch-action: none;
}

.mix-channel {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: linear-gradient(180deg, #2A3033, #1E2528);
  border: 1px solid #353D40;
  border-top-color: #3E4850;
  border-radius: 6px;
  padding: 8px 4px 16px;
  box-sizing: border-box;
  box-shadow: 0 2px 6px rgba(0,0,0,0.35), inset 0 1px 0 rgba(255,255,255,0.04);
}

.mix-icon {
  width: 20px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ch-color, rgba(170,178,180,0.70));
  flex-shrink: 0;
}

.mix-label {
  font-size: 10px;
  color: rgba(170,178,180,0.70);
  letter-spacing: 0.06em;
  margin: 3px 0 2px;
  flex-shrink: 0;
}

.mix-divider {
  width: 75%;
  height: 1px;
  background: var(--ch-color, rgba(170,178,180,0.70));
  opacity: 0.35;
  margin-bottom: 6px;
  border-radius: 1px;
  flex-shrink: 0;
}

.mix-fader-slot {
  flex: 1;
  width: 24px;
  position: relative;
  margin: 2px 0 6px;
  cursor: pointer;
  touch-action: none;
}

.mix-fader-slot::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  transform: translateX(-50%);
  background: var(--ch-color, rgba(170,178,180,0.70));
  opacity: 0.12;
  border-radius: 1px;
}

.mix-fader-slot::after {
  content: '';
  position: absolute;
  left: 50%;
  top: calc(var(--cap-top, 0px) + 12px);
  bottom: 0;
  width: 2px;
  transform: translateX(-50%);
  background: var(--ch-color, rgba(170,178,180,0.70));
  opacity: 0.65;
  border-radius: 1px;
}

.mix-fader-cap {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 56px;
  height: 24px;
  border-radius: 5px;
  background: linear-gradient(180deg, #323839, #1E2224);
  border: 1px solid #444C4E;
  border-top-color: #7A8488;
  box-shadow: 0 2px 6px rgba(0,0,0,0.70), inset 0 1px 0 rgba(255,255,255,0.16);
  cursor: grab;
  touch-action: none;
  z-index: 1;
}

.mix-fader-cap::after {
  content: '';
  position: absolute;
  left: 18%;
  right: 18%;
  top: 50%;
  transform: translateY(-50%);
  height: 1px;
  background: rgba(255,255,255,0.28);
  border-radius: 1px;
  box-shadow: 0 1px 0 rgba(0,0,0,0.45);
  pointer-events: none;
}

.mix-fader-cap.dragging { cursor: grabbing; }

.mix-level-bar {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 6px;
  height: 0%;
  background: var(--ch-color, rgba(170,178,180,0.60));
  border-radius: 2px 2px 0 0;
  opacity: 0.65;
  pointer-events: none;
  z-index: 0;
}

.mix-btns {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}

.mix-btn {
  width: 36px;
  height: 28px;
  border-radius: 4px;
  background: linear-gradient(180deg, #161A1C, #0F1214);
  border: 1px solid #262D30;
  color: rgba(140,148,152,0.90);
  font-size: 10px;
  font-weight: 600;
  cursor: pointer;
  letter-spacing: 0.02em;
  box-shadow: 0 3px 0 rgba(0,0,0,0.45), inset 0 1px 0 rgba(255,255,255,0.05);
  -webkit-tap-highlight-color: transparent;
}

.mix-btn.active {
  background: linear-gradient(180deg, #252B2E, #1B2023);
  border-color: #363D40;
  color: rgba(232,238,240,0.90);
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.50), inset 0 1px 0 rgba(255,255,255,0.08);
  text-shadow: 0 0 5px rgba(210,225,235,0.75), 0 0 12px rgba(190,210,225,0.35);
}

/* Mode switch */

.mode-switch-row {
  height: calc(44px + env(safe-area-inset-bottom, 0px));
  padding-bottom: env(safe-area-inset-bottom, 0px);
  display: flex;
  flex-shrink: 0;
  border-top: 1px solid var(--border-subtle);
}

.mode-btn-area {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  background: var(--bg-app);
}

.mode-btn {
  flex: 1;
  background: linear-gradient(180deg, #161A1C, #0F1214);
  border: 1px solid #262D30;
  border-radius: var(--radius);
  color: rgba(110, 118, 121, 0.85);
  font-size: 13px;
  cursor: pointer;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  text-shadow:
    0 -1px 0 rgba(0,0,0,0.55),
    0  1px 0 rgba(255,255,255,0.055);
  box-shadow:
    0 4px 0 rgba(0,0,0,0.50),
    inset 0 1px 0 rgba(255,255,255,0.07);
  transition: background 0.1s, color 0.1s, text-shadow 0.1s, box-shadow 0.08s, transform 0.08s;
}
.mode-btn svg { flex-shrink: 0; opacity: 0.72; filter: drop-shadow(0 1px 0 rgba(255,255,255,0.045)); }
.mode-btn:hover  { background: #1E2529; color: var(--text-secondary); }
.mode-btn.active {
  background: linear-gradient(180deg, #252B2E, #1B2023);
  border-color: #363D40;
  color: rgba(232,238,240,0.90);
  font-weight: 500;
  text-shadow:
    0 0 5px rgba(210,225,235,0.75),
    0 0 12px rgba(190,210,225,0.35);
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.50);
}
.mode-btn.active svg {
  opacity: 1;
  filter: drop-shadow(0 0 4px rgba(210,225,235,0.60));
}

/* ── Mobile: portrait (narrow screens) ──────────────────────────────────────── */

@media (max-width: 600px) {
  .toolbar {
    padding: calc(6px + env(safe-area-inset-top, 0px)) 0 6px 0;
  }

  .toolbar-main {
    gap: 8px;
    padding: 0 8px 0 0;
  }

  .toolbar button {
    padding: 4px 7px;
    font-size: 11px;
    height: 26px;
    box-sizing: border-box;
    white-space: nowrap;
    flex-shrink: 0;
  }

  #btn-proj-menu {
    font-size: 16px;
    min-width: 44px;
  }

  .toolbar label {
    font-size: 10px;
  }

  .bpm-pill {
    height: 26px;
    padding: 0 7px;
    box-sizing: border-box;
  }

  .bpm-pill label {
    font-size: 9px;
  }

  .bpm-pill input[type="number"] {
    font-size: 16px;
    width: 30px;
  }

  .bar-actions-area {
    gap: 4px;
    padding: 0 6px;
  }

  .bar-action-btn {
    padding: 4px 7px;
    white-space: nowrap;
    flex-shrink: 0;
  }

  .ruler-row       { height: 20px; }
  .loop-strip-row  { height: 8px; }
  #track1-row      { height: 34px; }
  #track2-row      { height: 34px; }
  #track3-row      { height: 34px; }
  #track4-row      { height: 34px; }
  .bar-actions-row { height: 30px; }

  .arrangement      { flex: none; }
  .step-seq-row     { height: 92px; }
  .pad-mode-row     { height: 44px; }
  .pad-controls-row { height: 70px; }
  .pads-row         { height: 176px; }
  .mode-switch-row  { height: calc(44px + env(safe-area-inset-bottom, 0px)); }

  .piano-roll-row  { min-height: 120px; }
  .mixer-row       { min-height: 120px; }

  .mode-btn { font-size: 14px; }

  .piano-roll-controls {
    padding: 4px 6px;
    gap: 6px;
  }
}

/* ── PWA standalone: fill empty space in arrangement ──────────────────────── */

@media (display-mode: standalone) {
  .arrangement { flex: 1; }
  #track1-row,
  #track2-row,
  #track3-row,
  #track4-row {
    flex-grow: 1;
    height: 40px;
  }
  .step-seq-row     { height: 92px; }
  .pad-mode-row     { height: 44px; }
  .pad-controls-row { height: 70px; }
}

/* ── Mobile: landscape (low-height screens) ─────────────────────────────────── */

@media (max-height: 500px) {
  .toolbar {
    padding: 4px 0;
  }

  .toolbar-main {
    padding: 0 8px 0 0;
    gap: 4px;
    overflow-x: auto;
  }

  .toolbar button {
    padding: 3px 6px;
    font-size: 11px;
    white-space: nowrap;
    flex-shrink: 0;
  }

  .toolbar label {
    font-size: 10px;
  }

  .bpm-pill input[type="number"] {
    font-size: 16px;
    width: 30px;
  }

  .ruler-row        { height: 18px; }
  .loop-strip-row   { height: 7px; }
  #track1-row       { height: 30px; }
  #track2-row       { height: 50px; }
  #track4-row       { height: 30px; }

  .bar-actions-row  { height: 28px; }
  .step-seq-row     { height: 80px; }
  .pad-mode-row     { height: 26px; }
  .pad-controls-row { height: 44px; }
  .pads-row         { height: 130px; }

  .bar-actions-area {
    overflow-x: auto;
    flex-wrap: nowrap;
  }

  .bar-action-btn {
    padding: 3px 6px;
    font-size: 10px;
    white-space: nowrap;
    flex-shrink: 0;
  }
}

.rec-hint {
  position: fixed;
  bottom: 120px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0,0,0,0.75);
  color: #fff;
  padding: 10px 18px;
  border-radius: 20px;
  font-size: 14px;
  white-space: nowrap;
  pointer-events: none;
  transition: opacity 0.4s;
  z-index: 999;
}
.rec-hint.hidden { opacity: 0; }

/* Unsaved Changes Modal */
.unsaved-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 500;
}
.unsaved-modal-overlay[hidden] { display: none; }
.unsaved-modal-box {
  background: rgba(22, 26, 29, 0.96);
  -webkit-backdrop-filter: blur(24px) saturate(160%);
  backdrop-filter: blur(24px) saturate(160%);
  border: 1px solid rgba(255, 255, 255, 0.10);
  border-radius: 14px;
  padding: 20px 16px 12px;
  width: min(300px, calc(100vw - 32px));
  box-shadow:
    0 24px 48px rgba(0, 0, 0, 0.70),
    inset 0 1px 0 rgba(255, 255, 255, 0.07);
}
#unsaved-modal-text {
  color: rgba(215, 225, 230, 0.92);
  font-size: 15px;
  line-height: 1.45;
  margin-bottom: 16px;
  padding: 0 2px;
}
.unsaved-modal-btns {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.unsaved-modal-btns button {
  width: 100%;
  background: transparent;
  border: none;
  border-radius: 8px;
  color: rgba(215, 225, 230, 0.92);
  font-size: 14px;
  padding: 0 14px;
  height: 44px;
  display: flex;
  align-items: center;
  cursor: pointer;
  letter-spacing: 0.01em;
  -webkit-tap-highlight-color: transparent;
}
.unsaved-modal-btns button + button {
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 0 0 8px 8px;
}
.unsaved-modal-btns button:first-child {
  border-radius: 8px 8px 0 0;
}
.unsaved-modal-btns button:hover { background: rgba(255,255,255,0.09); color: #fff; }
.unsaved-modal-btns button:active { background: rgba(255,255,255,0.14); }
#unsaved-btn-save { color: #4A9EFF; }
#unsaved-btn-save:hover { color: #6BB3FF; }