/* ─── design tokens ─────────────────────────────────────────────────────── */
:root {
  /* § 1 — color system */
  --bg:        #0a0b0f;
  --panel:     #13151c;
  --panel-2:   #1a1d26;
  --panel-3:   #232732;
  --line:      rgba(255,255,255,0.07);
  --line-dk:   rgba(0,0,0,0.45);
  --ink:       #e6e8ee;
  --dim:       #8a90a0;
  --faint:     #5a6072;
  --acc:       #54f0c8;
  --acc-dim:   #2e8a74;
  --hot:       #ff5b9e;
  --warn:      #ffd24a;
  --ink-on-acc: #04201a;  /* text colour on --acc background; override per theme */
  --tab-on-ink: var(--acc); /* active-tab text colour; override when --panel-3 is dark */
  --tab-bg:     var(--panel-3); /* active-tab pill fill; decoupled from hover surface */
  --meter-lo:  #54f0c8;
  --meter-mid: #ffd24a;
  --meter-hi:  #ff5b6b;

  /* component tokens — themed per [data-theme] */
  --cell:         #0d1020;   /* empty drum cell */
  --cell-alt:     #111828;   /* bar-alt cell */
  --hit1:         #3a5890;   /* groove hit gradient top */
  --hit2:         #1c2f54;   /* groove hit gradient bottom */
  --roll-bg:      #0f121a;   /* piano-roll / bass lane (white key) */
  --roll-bg-blk:  #0c0e14;   /* piano-roll / bass lane (black key) */
  --roll-note:    var(--acc); /* note blocks + bass notes */
  --grid-line:    #2a2e3a;   /* roll / scope gridlines */
  --scope:        #7dffe0;   /* scope trace */
  --playhead:     #ffffff;   /* roll / scope playhead */

  /* screen / glow */
  --screen-bg:   #07080d;
  --screen-glow: rgba(84,240,200,0.06);

  /* cabinet chrome — kept for screws */
  --chrome-hi:  #3a3e4e;
  --chrome-mid: #22252f;
  --chrome-lo:  #12141a;
  --bevel-hi:   rgba(255,255,255,0.06);
  --bevel-lo:   rgba(0,0,0,0.45);
}

/* ─── reset ─────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }

/* ─── page background ───────────────────────────────────────────────────── */
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 32px 16px 48px;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, #0d1120 0%, #05060a 100%);
  /* § 2 — system-sans body font */
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  font-size: 12px;
  font-weight: 500;
  line-height: 1.5;
  color: var(--ink);
}

/* § 2 — mono utility: numeric readouts */
.mono,
#bpmv,
.vhcell,
.vrow .vl,
.knob-lbl {
  font-family: ui-monospace, Menlo, monospace;
}

/* ─── cabinet frame — lightened from original ───────────────────────────── */
.cabinet {
  width: 100%;
  max-width: 1280px;
  border-radius: 18px;
  padding: 24px 22px 28px;
  position: relative;
  overflow: visible;

  /* subtle sheen only — no loud brushed-metal stripes */
  background: linear-gradient(
    170deg,
    var(--chrome-hi)  0%,
    var(--chrome-mid) 40%,
    var(--chrome-lo)  70%,
    #1a1c24           100%
  );

  box-shadow:
    inset 0 1px 0 var(--bevel-hi),
    inset 0 -1px 0 var(--bevel-lo),
    inset 1px 0 0 var(--bevel-hi),
    inset -1px 0 0 var(--bevel-lo),
    0 8px 48px rgba(0,0,0,0.7),
    0 2px 8px rgba(0,0,0,0.5);
}

/* screw accents */
.cabinet-corners { pointer-events: none; }
.screw {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #4a4e5e, #1a1c22);
  box-shadow:
    inset 0 1px 1px rgba(255,255,255,0.18),
    inset 0 -1px 1px rgba(0,0,0,0.5),
    0 0 0 1px rgba(0,0,0,0.4);
}
.screw::after {
  content: '';
  position: absolute;
  top: 50%; left: 20%; right: 20%;
  height: 1px;
  background: rgba(0,0,0,0.5);
  transform: translateY(-50%) rotate(45deg);
}
.screw.tl { top: 12px;  left: 12px;  }
.screw.tr { top: 12px;  right: 12px; }
.screw.bl { bottom: 12px; left: 12px; }
.screw.br { bottom: 12px; right: 12px; }

/* inner panel */
.cabinet-inner {
  position: relative;
  background: var(--bg);
  border-radius: 10px;
  padding: 18px 18px 20px;
  box-shadow:
    inset 0 2px 6px rgba(0,0,0,0.6),
    inset 0 1px 0 rgba(0,0,0,0.4);
}

/* ─── soft cabinet vignette — pointer-events:none preserved ─────────────── */
.crt-vignette {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 51;
  background: radial-gradient(ellipse at center,
    transparent 55%,
    rgba(0,0,0,0.22) 80%,
    rgba(0,0,0,0.45) 100%);
  border-radius: 18px;
}

/* ─── § 2 — title bar (tier 1) ──────────────────────────────────────────── */
.titlebar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
  gap: 12px;
}
.titlebar-tools {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}
/* Tool chrome — smaller, visually secondary vs transport */
.titlebar-tools select,
.titlebar-tools button {
  height: 26px;
  font-size: 11px;
  padding: 0 10px;
  color: var(--dim);
  background: transparent;
  border-color: var(--line);
  box-shadow: none;
}
.titlebar-tools select {
  padding-right: 26px;
}
.titlebar-tools button {
  width: 26px;
  padding: 0;
  font-size: 13px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.titlebar-tools button:hover,
.titlebar-tools select:hover {
  background-color: var(--panel-2);
  border-color: var(--acc-dim);
  color: var(--ink);
}

h1 {
  font-size: 18px;
  font-weight: 700;
  margin: 0;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--dim);
  text-shadow: 0 0 12px rgba(84,240,200,0.3);
}

/* ─── § 3 — unified control base ───────────────────────────────────────── */
button, select {
  font-family: inherit;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  height: 30px;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--ink);
  padding: 0 12px;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.04),
    inset 0 -1px 0 rgba(0,0,0,0.25),
    0 1px 3px rgba(0,0,0,0.35);
  transition: background 0.1s, border-color 0.1s, box-shadow 0.1s;
}
button:hover, select:hover {
  background-color: var(--panel-3);   /* not `background:` — shorthand would wipe the select chevron */
  border-color: var(--acc-dim);
}
button:active {
  box-shadow:
    inset 0 2px 4px rgba(0,0,0,0.45),
    inset 0 -1px 0 rgba(255,255,255,0.03);
  transform: translateY(1px);
}
button:focus-visible, select:focus-visible {
  outline: 2px solid var(--acc);
  outline-offset: 1px;
}

/* § 3 — select: explicit chevron */
select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%238a90a0'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 28px;
}

/* ─── § 3 — play button ─────────────────────────────────────────────────── */
#play {
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--acc) 82%, #fff) 0%,
    var(--acc) 55%,
    color-mix(in srgb, var(--acc) 80%, #000) 100%);
  color: var(--ink-on-acc);
  border-color: color-mix(in srgb, var(--acc) 70%, #000);
  font-weight: 700;
  min-width: 100px;
  letter-spacing: 0.05em;
  text-shadow: 0 1px 0 rgba(255,255,255,0.2);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.35),
    inset 0 -2px 0 rgba(0,0,0,0.25),
    0 0 12px color-mix(in srgb, var(--acc) 50%, transparent),
    0 2px 6px rgba(0,0,0,0.45);
}
#play:hover {
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--acc) 90%, #fff) 0%,
    color-mix(in srgb, var(--acc) 95%, #fff) 50%,
    color-mix(in srgb, var(--acc) 85%, #000) 100%);
  border-color: color-mix(in srgb, var(--acc) 75%, #000);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.4),
    inset 0 -2px 0 rgba(0,0,0,0.2),
    0 0 20px color-mix(in srgb, var(--acc) 65%, transparent),
    0 2px 6px rgba(0,0,0,0.4);
}
#play.on {
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--hot) 82%, #fff) 0%,
    var(--hot) 55%,
    color-mix(in srgb, var(--hot) 80%, #000) 100%);
  border-color: color-mix(in srgb, var(--hot) 70%, #000);
  color: #fff;
  text-shadow: 0 1px 0 rgba(0,0,0,0.35);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.3),
    inset 0 -2px 0 rgba(0,0,0,0.25),
    0 0 16px color-mix(in srgb, var(--hot) 55%, transparent),
    0 2px 6px rgba(0,0,0,0.45);
}

/* ─── § 3 — segmented tab control ──────────────────────────────────────── */
/* song credit — inline subtitle below the song selector */
#credit {
  font-size: 10px;
  color: var(--faint);
  min-height: 12px;
  letter-spacing: 0.02em;
  font-style: italic;
  line-height: 1.2;
}
#credit:not(:empty)::before { content: '♪ '; font-style: normal; opacity: 0.7; }

.vtabs {
  display: flex;
  gap: 6px;
  align-items: center;
  margin-bottom: 12px;
  padding: 0;
  background: transparent;
  border: none;
  box-shadow: none;
}
/* "VIEW" label to the left of the Scope toggle */
.vtabs-lbl {
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
  padding-right: 2px;
  user-select: none;
}
/* Scope is now a standalone toggle button, not a full-width pill strip */
.vtabs button {
  flex: 0 0 auto;
  height: 28px;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--dim);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.04),
    inset 0 -1px 0 rgba(0,0,0,0.25),
    0 1px 3px rgba(0,0,0,0.35);
  padding: 0 14px;
  transition: background 0.12s, color 0.12s, border-color 0.12s, box-shadow 0.12s;
}
.vtabs button:hover {
  background: var(--panel-3);
  border-color: var(--acc-dim);
  color: var(--ink);
}
.vtabs button.on {
  background: rgba(84,240,200,0.10);
  border-color: var(--acc);
  color: var(--acc);
  box-shadow:
    inset 0 -2px 0 var(--acc),
    inset 0 1px 0 rgba(84,240,200,0.08);
}
.vtabs button:focus-visible {
  outline: 2px solid var(--acc);
  outline-offset: 1px;
}
.vtab-lane { font-size: 11px; text-transform: capitalize; }

/* ─── tempo range ────────────────────────────────────────────────────────── */
input[type=range] {
  accent-color: var(--acc);
  height: 4px;
  cursor: pointer;
}

/* ─── § 8 — transport bar ───────────────────────────────────────────────── */
.transport {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-bottom: 16px;
}
.transport-tempo {
  display: flex;
  align-items: center;
  gap: 8px;
}
.transport-bpm-val {
  font-size: 13px;
  font-family: ui-monospace, Menlo, monospace;
  color: var(--ink);
  min-width: 3ch;
  text-align: right;
}
.transport-song {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

/* ─── § 4 — section panels ──────────────────────────────────────────────── */
/* Common panel chrome applied to the main content areas */
#viz,
#strips,
#fills,
#master,
#arrange {
  /* soft top-light → bottom-shade sheen (derived from --panel) so panels read
     as smooth surfaces in every theme, not flat matte cards on dark */
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--panel) 86%, #fff) 0%,
    var(--panel) 48%,
    color-mix(in srgb, var(--panel) 92%, #000) 100%);
  border-radius: 10px;
  border: 1px solid var(--line);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.06),
    0 1px 4px rgba(0,0,0,0.45);
  margin-bottom: 12px;
}

/* ─── CRT screen / viz area ──────────────────────────────────────────────── */
#viz {
  position: relative;
  padding: 10px 10px 8px;
  background: var(--screen-bg);
  /* Frame the screen with the theme hairline so the bezel reads on EVERY theme —
     on dark a black ring vanished against the near-black body. */
  border: 1px solid var(--line);

  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.06),
    inset 0 2px 14px rgba(0,0,0,0.85),
    inset 0 0 40px rgba(0,0,0,0.5),
    0 0 0 1px var(--line),
    0 0 24px var(--screen-glow);

  outline: 1px solid rgba(0,0,0,0.30);
  outline-offset: -2px;
}

/* ─── lane strips panel ──────────────────────────────────────────────────── */
#strips {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-width: 100%;
  padding: 12px;
  margin-top: 0;
}

/* ─── fills panel ────────────────────────────────────────────────────────── */
#fills {
  padding: 12px 16px;
}

/* ─── master panel ───────────────────────────────────────────────────────── */
#master {
  padding: 12px 16px;
}

/* ─── arrangement panel ──────────────────────────────────────────────────── */
#arrange {
  padding: 12px 16px;
}

/* ─── beat-number header row ────────────────────────────────────────────── */
.vhead {
  display: flex;
  gap: 3px;
  align-items: center;
  margin: 0 0 2px;
}
.vhl {
  width: 46px;
  flex: 0 0 46px;
}
.vhcell {
  flex: 1;
  height: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 8px;
  color: transparent;
  user-select: none;
  pointer-events: none;
}
.vhcell.beat {
  color: var(--dim);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-shadow: 0 0 6px rgba(84,240,200,0.4);
}

/* ─── grid rows ──────────────────────────────────────────────────────────── */
.vrow {
  display: flex;
  gap: 3px;
  align-items: center;
  margin: 3px 0;
}
.vrow .vl {
  width: 46px;
  font-size: 10px;
  color: var(--dim);
  text-align: right;
  padding-right: 4px;
  flex: 0 0 46px;
  letter-spacing: 0.04em;
  display: flex;
  align-items: center;
  justify-content: flex-end;
}
.vrow .vl-lbl { line-height: 1; }
.vrow .vr { flex: 0 0 auto; display: flex; gap: 2px; align-items: center; padding-left: 5px; }
.vrow.silenced > .vc,
.vrow.silenced > .vl > .vl-lbl { opacity: 0.3; transition: opacity .15s; }

/* ─── per-drum mute/solo buttons ─────────────────────────────────────────── */
.dvm, .dvs {
  width: 14px; height: 14px; flex: 0 0 14px; padding: 0; border-radius: 3px;
  font: 700 8px ui-monospace,Menlo,monospace; color: var(--dim);
  border: 1px solid var(--line); cursor: pointer; transition: .12s;
  background: linear-gradient(180deg, #22252f, #15171f);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.04), 0 1px 2px rgba(0,0,0,.4);
  line-height: 14px; text-align: center;
  display: inline-flex; align-items: center; justify-content: center;
}
.dvm:hover, .dvs:hover { border-color: var(--acc-dim); }
.dvm.muted {
  color: #fff1e8; border-color: #a8391c;
  background: linear-gradient(180deg, #ff7a3d, #d6481e);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.2), 0 0 6px rgba(255,90,40,.5);
}
.dvs.soloed {
  color: #04201a; border-color: #2eaa8a;
  background: linear-gradient(180deg, #63f8d4, #3dd6b0);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.2), 0 0 6px rgba(84,240,200,.5);
}
.vrow .vr .dvm, .vrow .vr .dvs { margin: 0; }

/* ─── step cells ─────────────────────────────────────────────────────────── */
.vc {
  flex: 1;
  height: 18px;
  border-radius: 3px;
  background: var(--cell);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 9px;
  color: #cfe0ff;
  cursor: pointer;
  position: relative;
  z-index: 2;
  transition: box-shadow 0.08s;
}

/* § 6 — alternating beat-group shading: odd beat-groups slightly lighter */
.vc.bar-alt { background: var(--cell-alt); }

/* § 6 — beat lines: stronger left border at beat starts */
.vc.beat {
  background: var(--cell);
  box-shadow: inset 1px 0 0 rgba(255,255,255,0.10);
}
.vc.bar-alt.beat { background: var(--cell-alt); }

/* § 6 — downbeat (step 0): even stronger marker */
.vc.downbeat {
  box-shadow: inset 2px 0 0 rgba(84,240,200,0.35);
}

/* § 6 — hit cells: subtle vertical gradient + soft teal glow */
.vc.hit {
  background: linear-gradient(180deg, var(--hit1) 0%, color-mix(in srgb, var(--hit1) 60%, var(--hit2)) 60%, var(--hit2) 100%);
  color: #cfe0ff;
  box-shadow:
    0 0 6px rgba(84,240,200,0.35),
    inset 0 1px 0 rgba(100,180,255,0.25),
    inset 0 -1px 0 rgba(0,0,0,0.3);
}
.vc.hit.bar-alt {
  background: linear-gradient(180deg, var(--hit1) 0%, color-mix(in srgb, var(--hit1) 60%, var(--hit2)) 60%, var(--hit2) 100%);
  filter: brightness(1.05);
}

/* § 6 — added cells: amber gradient, distinct from hit */
.vc.added {
  background: linear-gradient(180deg, #ffdd70 0%, #e8b830 60%, #c49420 100%);
  color: #2a1a00;
  box-shadow:
    0 0 7px rgba(255,210,74,0.45),
    inset 0 1px 0 rgba(255,255,200,0.35),
    inset 0 -1px 0 rgba(0,0,0,0.2);
}

/* § 6 — removed cells: ghost outline, clearly distinct */
.vc.removed {
  background: var(--cell);
  outline: 1px dashed rgba(180,140,60,0.55);
  outline-offset: -2px;
}
.vc.removed.bar-alt {
  background: var(--cell-alt);
}

/* § 6 — playhead: crisp --acc ring + faint column tint */
.vc.now {
  outline: 2px solid var(--acc);
  outline-offset: -2px;
  box-shadow: 0 0 8px rgba(84,240,200,0.30);
  background: rgba(84,240,200,0.06);
}
.vc.hit.now {
  outline: 2px solid var(--acc);
  outline-offset: -2px;
  box-shadow:
    0 0 10px rgba(84,240,200,0.55),
    0 0 4px rgba(255,255,255,0.25),
    inset 0 1px 0 rgba(100,220,200,0.3);
}
.vc.added.now {
  outline: 2px solid var(--acc);
  outline-offset: -2px;
  box-shadow:
    0 0 10px rgba(255,210,74,0.65),
    0 0 4px rgba(84,240,200,0.35);
}

/* ─── bar selector ───────────────────────────────────────────────────────── */
.barsel {
  display: flex;
  gap: 6px;
  align-items: center;
  margin-bottom: 8px;
  font-size: 11px;
  color: var(--dim);
}
.bsel {
  height: 26px;
  padding: 0 11px;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--ink);
  cursor: pointer;
  font-size: 12px;
}
.bsel.on {
  background: var(--acc);
  border-color: var(--acc);
  color: #04201a;
  font-weight: 700;
  box-shadow: 0 0 8px rgba(84,240,200,0.35);
}
.bsel.playing {
  outline: 2px solid var(--hot);
  outline-offset: 2px;
  box-shadow: 0 0 8px rgba(255,91,158,0.3);
}
.cyc {
  height: 26px;
  padding: 0 10px;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--ink);
  cursor: pointer;
  font-size: 12px;
}
.cyc.on {
  background: rgba(84,240,200,0.10);
  border-color: var(--acc);
  color: var(--acc);
}

/* ─── melody piano-roll canvas ──────────────────────────────────────────── */
#mroll {
  display: block;
  width: 100%;
  background: #07080d;
  border-radius: 6px;
  cursor: crosshair;
  position: relative;
  z-index: 2;
}

/* ─── bass roll canvas ──────────────────────────────────────────────────── */
#broll {
  display: block;
  width: 100%;
  background: #07080d;
  border-radius: 6px;
  position: relative;
  z-index: 2;
}

/* ─── scope canvas + bar ────────────────────────────────────────────────── */
#scope-canvas {
  display: block;
  width: 100%;
  background: #0b0d12;
  border-radius: 6px;
  position: relative;
  z-index: 2;
}
.scope-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
  position: relative;
  z-index: 2;
  font-size: 11px;
  color: var(--dim);
}
.scope-bar select {
  background: var(--panel-2);
  color: var(--acc);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0 28px 0 4px;
  font: inherit;
  cursor: pointer;
  height: 26px;
}

/* ─── § 5 — lane strips: aligned shared grid ────────────────────────────── */
.lane {
  display: grid;
  /* drag | name | pattern-select | meter | MIX | TONE | FX | M/S | actions */
  grid-template-columns: 16px 64px minmax(150px,220px) 10px auto auto auto 56px auto;
  column-gap: 12px;
  align-items: center;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 12px;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.03),
    0 1px 2px rgba(0,0,0,0.3);
}

/* § 2 — section header labels */
.lane .name {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
}
.lane select { width: 100%; }

/* dim non-audible lane */
.mute.on {
  background: #3a1622;
  border-color: #5a2030;
  color: #ff7da6;
}
.lane.silenced > :not(.msgroup) { opacity: .4; transition: opacity .15s; }

.mctl { display:flex; gap:8px; align-items:center; }
.mctl select { width:auto; }
.mctl select[data-lane] { flex:1; }
.mctl select[data-tone] { flex:0 0 auto; color:var(--dim); }

/* ─── § 5 — knob groups ─────────────────────────────────────────────────── */
.kgroup {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
}
.kgroup-lbl {
  font-size: 8px;
  font-weight: 600;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--faint);
  white-space: nowrap;
}
.kgroup-knobs {
  display: flex;
  flex-direction: row;
  gap: 10px;
  align-items: center;
}
/* hairline divider between groups (not on the first) */
.kgroup + .kgroup {
  border-left: 1px solid var(--line);
  padding-left: 12px;
  margin-left: 2px;
}

/* legacy .knobs kept for master strip compatibility */
.knobs {
  display: flex;
  flex-direction: row;
  gap: 10px;
  align-items: center;
}
.knob {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  user-select: none;
}
.knob-dial {
  width: 32px; height: 32px; border-radius: 50%; position: relative; cursor: ns-resize;
  background: radial-gradient(circle at 38% 32%, #3a3e4e, #15171f 70%);
  box-shadow:
    inset 0 1px 1px rgba(255,255,255,0.15),
    inset 0 -2px 3px rgba(0,0,0,0.6),
    0 1px 2px rgba(0,0,0,0.5);
}
.knob-ind {
  position: absolute; top: 3px; left: 50%; width: 2px; height: 11px;
  background: var(--acc); border-radius: 1px;
  transform-origin: 50% 13px;
  transform: translateX(-50%) rotate(-135deg);
  box-shadow: 0 0 4px var(--acc);
}
/* § 2 — control label: 9px / 600 / .06em / uppercase / --faint */
.knob-lbl {
  font-size: 9px;
  font-weight: 600;
  color: var(--faint);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* ─── mute / solo buttons ────────────────────────────────────────────────── */
.mute, .solo {
  width: 26px; height: 26px; flex: 0 0 26px; padding: 0; border-radius: 6px;
  font: 700 11px ui-monospace,Menlo,monospace; color: var(--dim);
  border: 1px solid var(--line); cursor: pointer; transition: .12s;
  background: var(--panel-2);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.04), inset 0 -1px 2px rgba(0,0,0,.3), 0 1px 2px rgba(0,0,0,.3);
}
.mute:hover, .solo:hover { border-color: var(--acc-dim); background: var(--panel-3); }
.mute.muted {
  color: #fff1e8; border-color: #a8391c;
  background: linear-gradient(180deg, #ff7a3d, #d6481e);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.3), 0 0 12px rgba(255,90,40,.6), 0 1px 2px rgba(0,0,0,.4);
  text-shadow: 0 1px 0 rgba(0,0,0,.3);
}
.solo.soloed {
  color: #04201a; border-color: #2eaa8a;
  background: linear-gradient(180deg, #63f8d4, #3dd6b0);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.3), 0 0 12px rgba(84,240,200,.6), 0 1px 2px rgba(0,0,0,.4);
  text-shadow: 0 1px 0 rgba(255,255,255,.2);
}

/* ─── § 5 — mute/solo group (no caption labels; letters + tooltip suffice) ── */
.msgroup { display:flex; gap:6px; align-items:center; justify-content:center; }
/* .ctrl-lbl suppressed — captions removed per §3 */
.ctrl-lbl { display: none; }

/* ─── § 7 — per-lane level meter ────────────────────────────────────────── */
.lvl {
  width: 8px;
  height: 40px;
  background: var(--screen-bg);
  border: 1px solid var(--line);
  border-radius: 3px;
  overflow: hidden;
  position: relative;
  align-self: center;
}
.lvl-fill {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 0%;
  background: linear-gradient(
    to top,
    var(--meter-lo)  0%,
    var(--meter-mid) 65%,
    var(--meter-hi)  100%
  );
  /* Size the gradient to the FULL well (40px) anchored at the bottom, so a
     growing fill REVEALS the fixed gradient upward instead of squashing it. */
  background-size: 100% 40px;
  background-position: left bottom;
  background-repeat: no-repeat;
  border-radius: 2px;
  transition: height 0.04s linear;
}

/* ─── master stereo meter wrapper (two .lvl bars side by side) ─────────── */
.lvl-stereo {
  display: flex;
  flex-direction: row;
  gap: 3px;
  align-items: center;
}

/* ─── fills row (panel chrome via #fills) ───────────────────────────────── */
.fillsrow {
  display: flex;
  gap: 6px;
  align-items: center;
  flex-wrap: wrap;
  row-gap: 6px;
}
/* § 2 — section header */
.fillsrow .flbl {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--faint);
  text-transform: uppercase;
  flex: 0 0 auto;
  margin-right: 2px;
}

/* § 8 — fill trigger buttons: unified control base, compact */
.fillbtn {
  height: 30px;
  padding: 0 10px;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--dim);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.04),
    inset 0 -1px 0 rgba(0,0,0,0.25),
    0 1px 2px rgba(0,0,0,0.3);
  transition: background 0.1s, border-color 0.1s, color 0.1s;
}
.fillbtn:hover {
  background: var(--panel-3);
  border-color: var(--acc-dim);
  color: var(--ink);
}
.fillbtn:focus-visible {
  outline: 2px solid var(--acc);
  outline-offset: 1px;
}
.fillbtn.firing {
  background: linear-gradient(180deg, #ff7ab8 0%, #e03e84 50%, #be1f65 100%);
  border-color: #be1f65;
  color: #fff;
  font-weight: 700;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.25),
    0 0 10px rgba(255,91,158,0.5);
}

/* § 8 — fill chain chips: small --panel-2 pills */
.fillchain {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  align-items: center;
  min-height: 24px;
  margin-left: 4px;
}
.fillchip {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  border-radius: 10px;
  font-size: 10px;
  letter-spacing: 0.04em;
  background: var(--panel-2);
  border: 1px solid var(--line);
  color: var(--dim);
  cursor: pointer;
  user-select: none;
  transition: background 0.1s, border-color 0.1s;
}
.fillchip:hover { background: var(--panel-3); border-color: var(--acc-dim); color: var(--ink); }
/* § 8 — .next chip: --acc ring (next-to-fire) */
.fillchip.next {
  border-color: var(--acc);
  color: var(--acc);
  box-shadow: 0 0 0 1px rgba(84,240,200,0.25), 0 0 6px rgba(84,240,200,0.2);
}

/* § 8 — clear button: subtle icon button */
.fillclear {
  padding: 0 8px;
  border-radius: 6px;
  height: 24px;
  font-size: 12px;
  color: var(--faint);
  background: transparent;
  border: 1px solid transparent;
  box-shadow: none;
  opacity: 0.7;
  transition: opacity 0.1s, color 0.1s, border-color 0.1s;
}
.fillclear:hover {
  opacity: 1;
  color: var(--hot);
  border-color: rgba(255,91,158,0.4);
  background: transparent;
}

/* ─── master FX strip (panel chrome via #master) ────────────────────────── */
.masterfx {
  display: flex;
  align-items: center;
  gap: 14px;
}
/* § 2 — section header */
.masterfx .mlbl {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--faint);
  text-transform: uppercase;
}

/* ─── arrangement UI (panel chrome via #arrange) ────────────────────────── */
.arrange-head {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 8px;
}
/* § 2 — section header */
.albl {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--faint);
  text-transform: uppercase;
  margin-right: 4px;
}

/* § 8 — Live/Song mode button: segmented-control style consistent with view tabs */
#modeBtn {
  /* base styles inherited from button {}; tweak to match segmented-control look */
  min-width: 80px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  height: 28px;
  border-radius: 6px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  color: var(--dim);
}
/* Song mode: teal accent — matches the active vtabs tab style */
#modeBtn.song {
  background: rgba(84,240,200,0.10);
  border-color: var(--acc);
  color: var(--acc);
  box-shadow:
    inset 0 -2px 0 var(--acc),
    inset 0 1px 0 rgba(84,240,200,0.08);
}

/* § 8 — timeline cells: panel radius/border, section accent colors, --acc on active */
.timeline { display: flex; gap: 4px; flex-wrap: wrap; }
.tcell {
  flex: 0 0 auto;
  min-width: 54px;
  padding: 7px 10px;
  border-radius: 6px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  font-size: 10px;
  color: var(--dim);
  text-align: center;
  opacity: 0.7;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  transition: opacity 0.1s, box-shadow 0.1s, outline-color 0.1s;
}
/* § 8 — active cell: --acc ring consistent with the rest of the control system */
.tcell.on {
  opacity: 1;
  outline: 2px solid var(--acc);
  outline-offset: 1px;
  color: var(--ink);
  box-shadow: 0 0 8px rgba(84,240,200,0.2);
}
.tcell-name { font-weight: 600; font-size: 10px; letter-spacing: 0.04em; }
.tcell-fill { font-size: 8px; color: var(--acc); opacity: 0.8; }

/* ─── transport key group ────────────────────────────────────────────────── */
.transport-key {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* KEY quantize toggle */
.key-q {
  width: auto;
  padding: 0 7px;
  font-size: 10px;
  letter-spacing: 0.04em;
  color: var(--dim);
  border-color: var(--line);
}
.key-q.on {
  background: rgba(84,240,200,0.12);
  border-color: var(--acc);
  color: var(--acc);
  box-shadow:
    inset 0 -1px 0 var(--acc),
    inset 0 1px 0 rgba(84,240,200,0.06);
}

/* ─── transport: shared label style (muted) ──────────────────────────────── */
.transport-lbl {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--faint);
}

/* ─── transport: vertical dividers between chunks ───────────────────────── */
.transport-divider {
  width: 1px;
  align-self: stretch;
  background: var(--line);
  margin: 0 4px;
  flex-shrink: 0;
}

/* ─── key stepper: tight unit wrapping − value + ───────────────────────── */
.key-stepper {
  display: inline-flex;
  align-items: center;
  gap: 0;
  border: 1px solid var(--line);
  border-radius: 5px;
  overflow: hidden;
  background: var(--panel-3);
}
.key-stepper button {
  width: 22px;
  height: 22px;
  border: none;
  border-radius: 0;
  background: transparent;
  color: var(--ink);
  font-size: 14px;
  line-height: 1;
  box-shadow: none;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.key-stepper button:hover { background: var(--panel-2); border-color: transparent; }
.key-stepper button:active { background: var(--acc-dim); }
.key-stepper #keyv {
  font-size: 12px;
  font-family: ui-monospace, Menlo, monospace;
  color: var(--ink);
  min-width: 3ch;
  text-align: center;
  padding: 0 2px;
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
  line-height: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* ─── song-wrap: selector + inline credit stacked ───────────────────────── */
.song-wrap {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

/* ─── transport-bpm-unit: muted ─────────────────────────────────────────── */
.transport-bpm-unit {
  font-size: 9px;
  color: var(--faint);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ─── colour themes — each block overrides design tokens only ────────────── */

[data-theme="light"] {
  --bg:          #e8eaef;
  --panel:       #ffffff;
  --panel-2:     #f1f3f7;
  --panel-3:     #e3e6ec;
  --line:        rgba(0,0,0,.12);
  --line-dk:     rgba(0,0,0,.18);
  --ink:         #1b1e26;
  --dim:         #565c6b;
  --faint:       #9298a8;
  --acc:         #0e9c80;
  --acc-dim:     #5cc3ad;
  --hot:         #d8357d;
  --ink-on-acc:  #ffffff;
  --warn:        #b8860a;
  --meter-lo:    #0e9c80;
  --meter-mid:   #b8860a;
  --meter-hi:    #d8357d;
  --cell:        #dfe3ea;
  --cell-alt:    #e8ebf1;
  --hit1:        #5b86d6;
  --hit2:        #3f6bc0;
  --roll-bg:     #eef1f6;
  --roll-bg-blk: #e2e6ee;
  --grid-line:   #c4ccd8;
  --scope:       #0e9c80;
  --playhead:    #1b1e26;
  --screen-bg:   #eef1f6;
  --screen-glow: transparent;
  --chrome-hi:   #d0d3dc;
  --chrome-mid:  #c0c4cd;
  --chrome-lo:   #b0b4bd;
  --bevel-hi:    rgba(255,255,255,0.6);
  --bevel-lo:    rgba(0,0,0,0.1);
}
/* disable dark glows on light theme */
[data-theme="light"] #viz,
[data-theme="light"] .vc.hit { box-shadow: none; }
[data-theme="light"] h1 { text-shadow: none; }

[data-theme="beige"] {
  --bg:          #cfc6b0;
  --panel:       #efe9d8;
  --panel-2:     #e5dec9;
  --panel-3:     #d7cfb6;
  --line:        rgba(70,58,34,.18);
  --line-dk:     rgba(70,58,34,.30);
  --ink:         #2c281e;
  --dim:         #6a6250;
  --faint:       #948b74;
  --acc:         #b06a22;
  --acc-dim:     #cf9b5e;
  --hot:         #b0405f;
  --ink-on-acc:  #ffffff;
  --warn:        #8a7212;
  --meter-lo:    #b06a22;
  --meter-mid:   #8a7212;
  --meter-hi:    #b0405f;
  --cell:        #c9c0a8;
  --cell-alt:    #d3cab2;
  --hit1:        #b58a4a;
  --hit2:        #8f6a2e;
  --roll-bg:     #ded6c0;
  --roll-bg-blk: #d3cab2;
  --grid-line:   #b7ad92;
  --scope:       #b06a22;
  --playhead:    #2c281e;
  --screen-bg:   #ded6c0;
  --screen-glow: transparent;
  --chrome-hi:   #b8ae98;
  --chrome-mid:  #a8a090;
  --chrome-lo:   #988e78;
  --bevel-hi:    rgba(255,255,255,0.4);
  --bevel-lo:    rgba(0,0,0,0.15);
}
[data-theme="beige"] #viz,
[data-theme="beige"] .vc.hit { box-shadow: none; }
[data-theme="beige"] h1 { text-shadow: none; }

[data-theme="playdate"] {
  /* BODY — yellow plastic, with Panic's signature PURPLE as the accent */
  --bg:          #caa600;
  --panel:       #ffd11a;
  --panel-2:     #f4c200;
  --panel-3:     #ffe066;   /* light hover surface (dark text stays legible) */
  --tab-bg:      #1a1500;   /* active-tab pill stays near-black */
  --line:        rgba(0,0,0,.30);
  --line-dk:     rgba(0,0,0,.45);
  --ink:         #1a1500;
  --dim:         #5a4900;
  --faint:       #8a7400;
  --acc:         #6a2ce0;   /* Panic purple — play, knobs, selection */
  --acc-dim:     #4a1ea0;
  --hot:         #ff4d8d;
  --warn:        #8a5a00;
  --meter-lo:    #6a2ce0;
  --meter-mid:   #c8a000;
  --meter-hi:    #ff4d8d;
  --ink-on-acc:  #ffffff;   /* white text on the purple play button */
  --tab-on-ink:  #ffe27a;   /* yellow label on the near-black active pill */
  --chrome-hi:   #d0a800;
  --chrome-mid:  #c09800;
  --chrome-lo:   #b08a00;
  --bevel-hi:    rgba(255,255,255,0.3);
  --bevel-lo:    rgba(0,0,0,0.2);
  /* SCREEN — reflective 1-bit Sharp LCD: silvery grey with dark content */
  --screen-bg:   #b6b8ac;
  --screen-glow: rgba(0,0,0,0.05);
  --roll-bg:     #bcbeb2;
  --roll-bg-blk: #b0b2a6;
  --roll-note:   #1a1a12;
  --grid-line:   #989a8c;
  --scope:       #2a2a1e;
  --playhead:    #6a2ce0;   /* purple playhead pops on the grey screen */
  --cell:        #b6b8ac;
  --cell-alt:    #bec0b4;
  --hit1:        #3a3a2e;
  --hit2:        #1a1a12;
}
[data-theme="playdate"] h1 { text-shadow: none; }
/* Signature purple surround behind the yellow device (Panic marketing look). */
[data-theme="playdate"] body {
  background: radial-gradient(ellipse 90% 70% at 50% 0%, #7b3cff 0%, #5b22d6 100%);
}
/* Light 1-bit screen: soften the deep inset glow so #viz reads as a pale LCD. */
[data-theme="playdate"] #viz {
  box-shadow:
    inset 0 0 0 1px rgba(0,0,0,0.15),
    inset 0 2px 8px rgba(0,0,0,0.18),
    0 0 0 1px rgba(0,0,0,0.3);
}

[data-theme="purple"] {
  --bg:          #140a22;
  --panel:       #1e1034;
  --panel-2:     #291745;
  --panel-3:     #38215c;
  --line:        rgba(255,255,255,.09);
  --line-dk:     rgba(0,0,0,.5);
  --ink:         #f1e7ff;
  --dim:         #b29cd2;
  --faint:       #7a6a9c;
  --acc:         #c77dff;
  --acc-dim:     #8a4fd0;
  --hot:         #ff5bb0;
  --ink-on-acc:  #1a0f2e;
  --warn:        #ffd24a;
  --meter-lo:    #c77dff;
  --meter-mid:   #ffd24a;
  --meter-hi:    #ff5bb0;
  --cell:        #1a0f2e;
  --cell-alt:    #221340;
  --hit1:        #7d4fd0;
  --hit2:        #4f2e8a;
  --roll-bg:     #190d2c;
  --roll-bg-blk: #140a22;
  --grid-line:   #3a2860;
  --scope:       #e0a8ff;
  --playhead:    #ffffff;
  --screen-bg:   #0d0718;
  --screen-glow: rgba(199,125,255,0.08);
  --chrome-hi:   #3a2060;
  --chrome-mid:  #2a1448;
  --chrome-lo:   #1c0e30;
}

[data-theme="gameboy"] {
  /* BODY — light-grey plastic + magenta A/B accent */
  --bg:          #b0b0a2;
  --panel:       #d2d2c4;
  --panel-2:     #c6c6b8;
  --panel-3:     #adafa0;
  --line:        rgba(0,0,0,.16);
  --line-dk:     rgba(0,0,0,.30);
  --ink:         #2e2e28;
  --dim:         #5a5a50;
  --faint:       #86867a;
  --acc:         #b53a5b;
  --acc-dim:     #8a2a44;
  --hot:         #b53a5b;
  --warn:        #7a7a14;
  --ink-on-acc:  #ffffff;
  --tab-on-ink:  #b53a5b;
  --meter-lo:    #8bac0f;
  --meter-mid:   #6f8f12;
  --meter-hi:    #b53a5b;
  --chrome-hi:   #c0c0b2;
  --chrome-mid:  #aeae9e;
  --chrome-lo:   #9c9c8c;
  --bevel-hi:    rgba(255,255,255,0.45);
  --bevel-lo:    rgba(0,0,0,0.18);
  /* SCREEN — olive-green LCD, dark-green content */
  --screen-bg:   #9bbc0f;
  --screen-glow: rgba(155,188,15,0.12);
  --roll-bg:     #8bac0f;
  --roll-bg-blk: #7e9d0d;
  --roll-note:   #0f380f;
  --grid-line:   #6f8f0d;
  --scope:       #0f380f;
  --playhead:    #0f380f;
  --cell:        #8bac0f;
  --cell-alt:    #93b412;
  --hit1:        #306230;
  --hit2:        #0f380f;
}
/* neutralise dark glows on the olive LCD screen */
[data-theme="gameboy"] #viz {
  box-shadow:
    inset 0 0 0 1px rgba(0,0,0,0.15),
    inset 0 2px 8px rgba(0,0,0,0.25),
    0 0 0 1px rgba(0,0,0,0.3),
    0 0 16px var(--screen-glow);
}
/* Game Boy theme: GROOVEBOX™ as a navy rounded plastic-stamped wordmark,
   in the spirit of the console's silkscreened logo on the grey shell. */
[data-theme="gameboy"] h1 {
  color: #2a2a78;
  font-family: 'Arial Rounded MT Bold', 'Helvetica Rounded', 'Trebuchet MS', system-ui, sans-serif;
  font-weight: 800;
  font-style: italic;
  letter-spacing: 0.01em;
  text-shadow: 0 1px 0 rgba(255,255,255,0.45);   /* embossed-on-plastic */
}
[data-theme="gameboy"] h1::after {
  content: '™';
  font-size: 0.42em;
  font-style: normal;
  font-weight: 600;
  vertical-align: 0.7em;
  margin-left: 3px;
  letter-spacing: 0;
}
/* Game Boy is a two-accent palette: navy BLUE for the silkscreened labels/logo,
   magenta for the interactive controls (A/B buttons → play, knobs, active states).
   Tint the body section labels blue to match the console. */
[data-theme="gameboy"] .lane .name,
[data-theme="gameboy"] .kgroup-lbl,
[data-theme="gameboy"] .fillsrow .flbl,
[data-theme="gameboy"] .masterfx .mlbl,
[data-theme="gameboy"] .albl,
[data-theme="gameboy"] .transport-lbl {
  color: #2a2a78;
  font-weight: 800;
}

[data-theme="amber"] {
  --bg:          #080500;
  --panel:       #110c03;
  --panel-2:     #1b1408;
  --panel-3:     #2a200e;
  --line:        rgba(255,176,0,.16);
  --line-dk:     rgba(0,0,0,.5);
  --ink:         #ffcf7a;
  --dim:         #b87f20;
  --faint:       #7a5410;
  --acc:         #ffb000;
  --acc-dim:     #a06e00;
  --hot:         #ff6a3d;
  --ink-on-acc:  #1b1400;
  --warn:        #ffd24a;
  --meter-lo:    #ffb000;
  --meter-mid:   #ffd24a;
  --meter-hi:    #ff6a3d;
  --cell:        #140d02;
  --cell-alt:    #1e1506;
  --hit1:        #b87f20;
  --hit2:        #7a5410;
  --roll-bg:     #140d02;
  --roll-bg-blk: #0d0800;
  --grid-line:   #3a2c0e;
  --scope:       #ffd24a;
  --playhead:    #ffcf7a;
  --screen-bg:   #050300;
  --screen-glow: rgba(255,176,0,0.08);
  --chrome-hi:   #3a2c0e;
  --chrome-mid:  #2a200e;
  --chrome-lo:   #1b1408;
}

[data-theme="r1"] {
  /* BODY — Rabbit orange + white/black UI */
  --bg:          #d63e00;
  --panel:       #fe5000;
  --panel-2:     #e84800;
  --panel-3:     #161616;
  --line:        rgba(0,0,0,.26);
  --line-dk:     rgba(0,0,0,.40);
  --ink:         #ffffff;
  --dim:         #ffd2bf;
  --faint:       #ffae8c;
  --acc:         #ffffff;
  --acc-dim:     #cccccc;
  --hot:         #ff2d00;
  --warn:        #ffd24a;
  --ink-on-acc:  #161616;
  --tab-on-ink:  #ffffff;
  --meter-lo:    #ff7836;
  --meter-mid:   #ffd24a;
  --meter-hi:    #ff2d00;
  --chrome-hi:   #ff6a20;
  --chrome-mid:  #e84800;
  --chrome-lo:   #c83e00;
  --bevel-hi:    rgba(255,255,255,0.18);
  --bevel-lo:    rgba(0,0,0,0.35);
  /* SCREEN — true black, white content, orange highlight */
  --screen-bg:   #000000;
  --screen-glow: rgba(255,80,0,0.10);
  --roll-bg:     #0a0a0a;
  --roll-bg-blk: #050505;
  --roll-note:   #ffffff;
  --grid-line:   #242424;
  --scope:       #ffffff;
  --playhead:    #ff5000;
  --cell:        #0a0a0a;
  --cell-alt:    #141414;
  --hit1:        #ff7836;
  --hit2:        #d64800;
}

/* ─── § 5 — lane actions: dup + remove buttons ────────────────────────────── */
.lane-actions {
  display: flex;
  gap: 4px;
  align-items: center;
}

/* Shared base for dup and remove — small icon buttons */
.lane-dup, .lane-rm {
  width: 24px; height: 24px; flex: 0 0 24px;
  padding: 0;
  border-radius: 5px;
  font-size: 13px;
  line-height: 1;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--faint);
  box-shadow: none;
  transition: background 0.1s, color 0.1s, border-color 0.1s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.lane-dup:hover {
  background: var(--panel-3);
  border-color: var(--acc-dim);
  color: var(--acc);
}
.lane-rm:hover:not(:disabled) {
  background: rgba(255,91,158,0.10);
  border-color: rgba(255,91,158,0.4);
  color: var(--hot);
}
.lane-rm:disabled {
  opacity: 0.25;
  cursor: not-allowed;
}

/* ─── § 5 — lane edit button ───────────────────────────────────────────────── */
/* Old-school radio-SELECT push button: raised at rest, latched (pushed-in + lit)
   when this lane is the one open in the editor. Only one latched at a time. */
.lane-edit {
  width: 40px; height: 24px; flex: 0 0 40px;
  padding: 0;
  border-radius: 4px;
  font-size: 8px; font-weight: 700; letter-spacing: 0.08em;
  line-height: 1;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--panel-3), var(--panel-2));
  color: var(--faint);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.06), 0 1px 2px rgba(0,0,0,0.4);
  transition: background 0.1s, color 0.1s, border-color 0.1s, box-shadow 0.12s, transform 0.06s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.lane-edit:hover:not(:disabled) {
  border-color: var(--acc-dim);
  color: var(--acc);
}
.lane-edit:disabled {
  opacity: 0.2;
  cursor: not-allowed;
}
/* Latched/lit state — the lane whose editor is currently open (the "selected" one) */
.lane-edit.editing {
  background: var(--acc);
  border-color: color-mix(in srgb, var(--acc) 60%, #000);
  color: var(--ink-on-acc);
  transform: translateY(1px);
  box-shadow:
    inset 0 2px 4px rgba(0,0,0,0.4),
    0 0 8px color-mix(in srgb, var(--acc) 55%, transparent);
}

/* Editing lane strip: subtle teal left border highlight */
.lane.editing {
  border-left: 2px solid var(--acc);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.03),
    0 1px 2px rgba(0,0,0,0.3),
    0 0 0 1px rgba(84,240,200,0.08);
}

/* ─── § 5 — inline lane rename input ───────────────────────────────────────── */
.lane-rename-input {
  font-family: inherit;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink);
  background: var(--panel-3);
  border: 1px solid var(--acc-dim);
  border-radius: 4px;
  padding: 1px 5px;
  height: 22px;
  width: 60px;
  outline: none;
  box-shadow: 0 0 0 2px rgba(84,240,200,0.15);
}

/* ─── § 5 — add-lane button + menu ─────────────────────────────────────────── */
.addlane-wrap {
  position: relative;
  display: flex;
  align-items: center;
  padding: 4px 0 0;
}

.addlane-btn {
  height: 26px;
  padding: 0 12px;
  border-radius: 6px;
  border: 1px dashed var(--line);
  background: transparent;
  color: var(--faint);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  box-shadow: none;
  transition: background 0.1s, color 0.1s, border-color 0.1s;
}
.addlane-btn:hover {
  background: var(--panel-2);
  border-color: var(--acc-dim);
  color: var(--acc);
  border-style: solid;
}

.addlane-menu {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 2px;
  background: var(--panel-3);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.45);
  min-width: 110px;
}
.addlane-menu[hidden] { display: none; }
.addlane-menu button {
  width: 100%;
  height: 28px;
  text-align: left;
  padding: 0 10px;
  border-radius: 5px;
  border: none;
  background: transparent;
  color: var(--dim);
  font-size: 12px;
  font-weight: 500;
  box-shadow: none;
  transition: background 0.08s, color 0.08s;
}
.addlane-menu button:hover {
  background: var(--panel-2);
  color: var(--ink);
  border-color: transparent;
}

/* ─── § 5 — drag handle ─────────────────────────────────────────────────────── */
.lane-drag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 24px;
  font-size: 14px;
  color: var(--faint);
  cursor: grab;
  user-select: none;
  opacity: 0.45;
  transition: opacity 0.1s, color 0.1s;
  line-height: 1;
}
.lane-drag:hover { opacity: 1; color: var(--dim); }
.lane-drag:active { cursor: grabbing; }

/* ─── Dragging state ─────────────────────────────────────────────────────────── */
.lane.dragging {
  opacity: 0.45;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.03),
    0 1px 2px rgba(0,0,0,0.3);
}

/* ─── Drop-position indicators ───────────────────────────────────────────────── */
.lane.drop-above {
  border-top: 2px solid var(--acc);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.03),
    0 1px 2px rgba(0,0,0,0.3),
    0 -2px 8px rgba(84,240,200,0.25);
}
.lane.drop-below {
  border-bottom: 2px solid var(--acc);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.03),
    0 1px 2px rgba(0,0,0,0.3),
    0 2px 8px rgba(84,240,200,0.25);
}

/* ─── Piano ⇄ Blocks roll-mode toggle ──────────────────────────────────────── */
.roll-mode-bar {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-bottom: 6px;
}
.roll-mode-lbl {
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
  padding-right: 4px;
  user-select: none;
}
.roll-mode-btn {
  height: 22px;
  padding: 0 10px;
  border-radius: 5px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--dim);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.04em;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.04),
    inset 0 -1px 0 rgba(0,0,0,0.2);
  transition: background 0.1s, color 0.1s, border-color 0.1s;
}
.roll-mode-btn:hover {
  background: var(--panel-3);
  border-color: var(--acc-dim);
  color: var(--ink);
}
.roll-mode-btn.rm-on {
  background: rgba(84,240,200,0.10);
  border-color: var(--acc);
  color: var(--acc);
  box-shadow:
    inset 0 -2px 0 var(--acc),
    inset 0 1px 0 rgba(84,240,200,0.08);
}

/* ─── Blocks grid (pitch × step DOM grid) ───────────────────────────────────── */
/* Outer scroll wrapper: constrain height so ~25 pitch rows fit */
.bg-scroll {
  overflow-y: auto;
  max-height: 200px;
  border-radius: 4px;
}
/* The grid container: rows are stacked flex lines */
.bg-grid {
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
}
/* Each row (header + pitch rows) is a flex line */
.bg-row {
  display: flex;
  gap: 1px;
  align-items: center;
}
/* Header row (bar numbers) */
.bg-head-row {
  margin-bottom: 2px;
}
.bg-hcell {
  flex: 1;
  height: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 8px;
  color: transparent;
  user-select: none;
  pointer-events: none;
}
.bg-hcell.beat { color: var(--dim); font-weight: 600; }
.bg-hcell.downbeat { color: var(--acc); font-weight: 700; }

/* Pitch label cell (left column) */
.bg-lbl {
  flex: 0 0 30px;
  height: 10px;
  font-size: 7px;
  font-family: ui-monospace, Menlo, monospace;
  color: transparent;          /* only C-notes get visible labels */
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 3px;
  user-select: none;
  pointer-events: none;
}
/* Show label only on C rows (non-empty lbl text) */
.bg-lbl:not(:empty) { color: var(--faint); }
.bg-blk .bg-lbl:not(:empty) { color: var(--dim); }

/* Step cells — compact height for pitch-density */
.bg-grid .vc {
  flex: 1;
  height: 10px;
  border-radius: 2px;
  min-width: 0;
  cursor: default;
}
.bg-grid[data-lv="melody"] .vc { cursor: crosshair; }

/* ─── § 4 — section drag-reorder wrappers ────────────────────────────────────── */
/* .sec wraps each top-level section so the .sec-drag handle persists across
   re-renders (renderStrips/renderFills etc. rebuild section innerHTML, not .sec) */
.sec {
  position: relative;
}

.sec-drag {
  position: absolute;
  top: 50%;
  left: 4px;
  transform: translateY(-50%);
  width: 12px;
  height: 22px;
  font-size: 13px;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--faint);
  opacity: 0.35;
  cursor: grab;
  user-select: none;
  z-index: 5;
  transition: opacity 0.1s, color 0.1s;
}
.sec-drag:hover { opacity: 0.9; color: var(--dim); }
.sec-drag:active { cursor: grabbing; }

/* Dragging state for a section wrapper */
.sec.sec-dragging { opacity: 0.45; }

/* Drop indicators */
.sec.sec-drop-above {
  outline: 2px solid var(--acc);
  outline-offset: 2px;
  box-shadow: 0 -3px 10px rgba(84,240,200,0.25);
}
.sec.sec-drop-below {
  outline: 2px solid var(--acc);
  outline-offset: 2px;
  box-shadow: 0 3px 10px rgba(84,240,200,0.25);
}

/* ─── Transport actions group (View + Help) ──────────────────────────────────── */
.transport-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: 4px;
}

/* ─── View-settings popover ──────────────────────────────────────────────────── */
.vs-wrap {
  position: relative;
}
#viewsettings {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  z-index: 200;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
  min-width: 210px;
}
#viewsettings[hidden] { display: none; }
.vs-title {
  display: block;
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 8px;
}
.vs-presets {
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}
.vs-preset-lbl {
  display: block;
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 5px;
}
.vs-preset-btns {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
#viewsettings .vs-preset-btn {
  display: block !important;
  width: 100% !important;
  box-sizing: border-box;
  height: 26px;
  padding: 4px 10px;
  border-radius: 5px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--dim);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-align: center;
  white-space: nowrap;
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.04),
    inset 0 -1px 0 rgba(0,0,0,0.2);
  transition: background 0.1s, border-color 0.1s, color 0.1s;
}
.vs-preset-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}
.vs-preset-btn:hover {
  background: var(--panel-3);
  border-color: var(--acc-dim);
  color: var(--ink);
}
.vs-preset-btn.on {
  background: rgba(84,240,200,0.10);
  border-color: var(--acc);
  color: var(--acc);
  box-shadow:
    inset 0 -2px 0 var(--acc),
    inset 0 1px 0 rgba(84,240,200,0.08);
}
.vs-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 3px 0;
  font-size: 11px;
  color: var(--ink);
  cursor: pointer;
}
.vs-row input[type="checkbox"] {
  accent-color: var(--acc);
  width: 13px;
  height: 13px;
  cursor: pointer;
  flex: 0 0 auto;
}

/* ─── Help modal ─────────────────────────────────────────────────────────────── */
#help-modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
}
#help-modal[hidden] { display: none; }
#help-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.65);
}
#help-modal-box {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 24px 28px 28px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.6);
  max-width: 640px;
  width: calc(100vw - 48px);
  max-height: calc(100vh - 80px);
  overflow-y: auto;
  z-index: 1;
}
#help-modal-box h2 {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--dim);
  margin: 0 0 18px;
}
#help-modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 26px;
  height: 26px;
  padding: 0;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--faint);
  font-size: 13px;
  box-shadow: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.1s, color 0.1s;
}
#help-modal-close:hover {
  background: var(--panel-3);
  color: var(--ink);
}
.help-sections {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px 28px;
}
.help-section h3 {
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
  margin: 0 0 8px;
}
.help-section dl {
  margin: 0;
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 10px;
  row-gap: 4px;
  align-items: baseline;
}
.help-section dt {
  font-size: 11px;
  font-weight: 700;
  color: var(--ink);
  white-space: nowrap;
}
.help-section dd {
  font-size: 11px;
  color: var(--dim);
  margin: 0;
}

/* ─── Global hide-knob rules ─────────────────────────────────────────────────── */
body.hide-k-vol  .knob[data-k="vol"]  { display: none; }
body.hide-k-pan  .knob[data-k="pan"]  { display: none; }
body.hide-k-cut  .knob[data-k="cut"]  { display: none; }
body.hide-k-res  .knob[data-k="res"]  { display: none; }
body.hide-k-drv  .knob[data-k="drv"]  { display: none; }
body.hide-k-dly  .knob[data-k="dly"]  { display: none; }
body.hide-k-fdbk .knob[data-k="fdbk"] { display: none; }
body.hide-k-cho  .knob[data-k="cho"]  { display: none; }
body.hide-k-wob  .knob[data-k="wob"]  { display: none; }
body.hide-k-cru  .knob[data-k="cru"]  { display: none; }
body.hide-k-vrb  .knob[data-k="vrb"]  { display: none; }
body.hide-k-cmp  .knob[data-k="cmp"]  { display: none; }
body.hide-k-bal  .knob[data-k="bal"]  { display: none; }
body.hide-k-wid  .knob[data-k="wid"]  { display: none; }
body.hide-k-lo   .knob[data-k="lo"]   { display: none; }
body.hide-k-hi   .knob[data-k="hi"]   { display: none; }