:root {
  color-scheme: dark;
  --bg: #061117;
  --panel: rgba(10, 27, 35, 0.84);
  --panel-border: rgba(175, 222, 231, 0.14);
  --text: #edf8f6;
  --muted: #86a6aa;
  --cyan: #64e5df;
  --gold: #ffc65a;
  --key-size: 84px;
  --key-height: calc(var(--key-size) * 1.1547);
  --board-width-units: 12;
  --board-height-units: 9;
  --overview-height: 72px;
  font-family: ui-rounded, "SF Pro Rounded", "SF Pro Display", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-tap-highlight-color: transparent;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  overscroll-behavior: none;
  touch-action: none;
}

button,
select,
input {
  font: inherit;
}

button,
select {
  color: inherit;
}

button {
  border: 0;
}

.instrument {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 420px;
  overflow: hidden;
  background:
    radial-gradient(circle at 12% 8%, rgba(47, 185, 194, 0.16), transparent 30%),
    radial-gradient(circle at 88% 92%, rgba(242, 162, 58, 0.12), transparent 31%),
    linear-gradient(150deg, #071821 0%, #061117 48%, #0b1518 100%);
}

.instrument::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.32;
  background-image:
    linear-gradient(rgba(154, 224, 226, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(154, 224, 226, 0.02) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: linear-gradient(to bottom, black, transparent 74%);
}

.topbar {
  position: relative;
  z-index: 5;
  height: calc(76px + env(safe-area-inset-top));
  padding: max(12px, env(safe-area-inset-top)) max(20px, env(safe-area-inset-right)) 12px max(20px, env(safe-area-inset-left));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border-bottom: 1px solid var(--panel-border);
  background: linear-gradient(180deg, rgba(6, 18, 24, 0.96), rgba(6, 18, 24, 0.72));
  backdrop-filter: blur(22px) saturate(140%);
  -webkit-backdrop-filter: blur(22px) saturate(140%);
}

.brand {
  min-width: max-content;
  display: grid;
  grid-template-columns: 44px auto;
  grid-template-rows: 1fr auto;
  column-gap: 11px;
  align-items: center;
}

.brand-mark {
  position: relative;
  grid-row: 1 / 3;
  width: 42px;
  height: 42px;
}

.brand-mark i {
  position: absolute;
  width: 20px;
  height: 23px;
  clip-path: polygon(50% 0, 100% 25%, 100% 75%, 50% 100%, 0 75%, 0 25%);
  background: linear-gradient(145deg, #91f5eb, #2fb9c2);
  box-shadow: 0 0 14px rgba(100, 229, 223, 0.35);
}

.brand-mark i:nth-child(1) { left: 0; top: 10px; }
.brand-mark i:nth-child(2) { left: 17px; top: 0; background: linear-gradient(145deg, #ffd67e, #dc8f35); }
.brand-mark i:nth-child(3) { left: 17px; top: 20px; background: linear-gradient(145deg, #61d5df, #247f91); }

.brand-name {
  align-self: end;
  font-size: 1.32rem;
  font-weight: 760;
  letter-spacing: 0.14em;
  line-height: 1;
}

.brand-sub {
  align-self: start;
  margin-top: 5px;
  color: var(--muted);
  font-size: 0.58rem;
  font-weight: 650;
  letter-spacing: 0.18em;
}

.controls {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 9px;
}

.control-select,
.volume-control {
  height: 46px;
  padding: 6px 12px;
  display: grid;
  align-content: center;
  gap: 2px;
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  background: rgba(12, 31, 39, 0.72);
}

.control-select span,
.volume-control span,
.transpose-control small {
  color: var(--muted);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  line-height: 1;
}

.control-select select {
  min-width: 94px;
  padding: 0 20px 0 0;
  border: 0;
  outline: 0;
  appearance: none;
  background: linear-gradient(45deg, transparent 50%, var(--muted) 50%) right 2px center / 5px 5px no-repeat;
  font-size: 0.82rem;
  font-weight: 640;
}

.transpose-control {
  height: 46px;
  display: flex;
  align-items: center;
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  overflow: hidden;
  background: rgba(12, 31, 39, 0.72);
}

.transpose-control > span {
  width: 46px;
  display: grid;
  place-items: center;
  gap: 2px;
}

.transpose-control strong {
  font-size: 0.86rem;
  line-height: 1;
}

.mini-button {
  width: 36px;
  height: 100%;
  background: transparent;
  color: var(--cyan);
  font-size: 1.2rem;
}

.mini-button:active,
.mini-button:focus-visible {
  background: rgba(100, 229, 223, 0.13);
  outline: none;
}

.mini-button:disabled {
  color: #3e565b;
  background: transparent;
}

.toggle-button,
.panic-button,
.labels-button {
  height: 46px;
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  background: rgba(12, 31, 39, 0.72);
  color: #bbd0d2;
  font-size: 0.82rem;
  font-weight: 650;
}

.toggle-button {
  padding: 0 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toggle-light {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #50646a;
  box-shadow: 0 0 0 3px rgba(80, 100, 106, 0.16);
}

.toggle-button[aria-pressed="true"] {
  color: #fff4cf;
  border-color: rgba(255, 198, 90, 0.42);
  background: rgba(119, 76, 21, 0.38);
}

.toggle-button[aria-pressed="true"] .toggle-light {
  background: var(--gold);
  box-shadow: 0 0 12px rgba(255, 198, 90, 0.8);
}

.performance-toggles {
  position: absolute;
  z-index: 13;
  display: flex;
  gap: 7px;
  transition: opacity 180ms ease;
}

.performance-layout-select {
  min-width: 112px;
  height: 42px;
  padding: 5px 11px;
  display: grid;
  align-content: center;
  gap: 1px;
  border: 1px solid rgba(100, 229, 223, 0.28);
  border-radius: 14px;
  color: #d8f4f2;
  background: rgba(5, 19, 25, 0.78);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.28), inset 0 1px 0 rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.performance-layout-select > span {
  color: #7f9ea2;
  font-size: 0.58rem;
  font-weight: 690;
  letter-spacing: 0.08em;
  line-height: 1;
}

.performance-layout-select select {
  min-width: 0;
  width: 100%;
  padding: 0 18px 0 0;
  border: 0;
  outline: 0;
  appearance: none;
  color: #d8f4f2;
  color-scheme: light;
  background: linear-gradient(45deg, transparent 50%, var(--cyan) 50%) right 2px center / 5px 5px no-repeat;
  font-size: 0.76rem;
  font-weight: 740;
  line-height: 1.2;
}

.performance-layout-select select:focus-visible {
  border-radius: 5px;
  box-shadow: 0 0 0 2px rgba(100, 229, 223, 0.24);
}

.performance-layout-select option {
  color: #10252b;
  background: #f5fbfa;
}

.performance-toggle-button {
  min-width: 70px;
  height: 42px;
  padding: 0 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid rgba(172, 215, 217, 0.24);
  border-radius: 14px;
  color: #c4d8d9;
  background: rgba(5, 19, 25, 0.72);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.28), inset 0 1px 0 rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  font-size: 0.78rem;
  font-weight: 720;
  touch-action: manipulation;
  transition: opacity 180ms ease, transform 70ms ease, background 140ms ease;
}

.performance-toggle-button[aria-pressed="true"] {
  color: #fff2c8;
  border-color: rgba(255, 198, 90, 0.58);
  background: rgba(92, 60, 18, 0.76);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3), 0 0 18px rgba(255, 198, 90, 0.16);
}

.performance-toggle-button[aria-pressed="true"] .toggle-light {
  background: var(--gold);
  box-shadow: 0 0 12px rgba(255, 198, 90, 0.82);
}

.performance-toggle-button:active {
  transform: translateY(1px) scale(0.97);
}

.volume-control {
  width: 116px;
}

.volume-control input {
  width: 92px;
  height: 12px;
  margin: 1px 0 0;
  accent-color: var(--cyan);
}

.play-surface {
  --overview-reserve: 0px;
  position: absolute;
  inset: 0;
  z-index: 2;
  height: 100%;
  padding: 0;
}

.play-surface.has-overview {
  --overview-reserve: calc(max(4px, env(safe-area-inset-top)) + 36px);
}

.status-row,
.bottom-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.layout-readout {
  min-width: 265px;
  display: flex;
  align-items: center;
  gap: 9px;
  color: #c6dcdd;
  font-size: 0.76rem;
  font-weight: 690;
  letter-spacing: 0.04em;
}

.layout-name {
  padding: 5px 9px;
  border: 1px solid rgba(100, 229, 223, 0.18);
  border-radius: 9px;
  color: #d8f4f2;
  background: rgba(16, 44, 51, 0.62);
  font-size: 0.72rem;
  font-weight: 690;
}

.layout-picker {
  position: relative;
  display: flex;
  align-items: center;
}

.layout-picker select {
  min-width: 128px;
  padding: 5px 20px 5px 8px;
  border: 1px solid rgba(100, 229, 223, 0.18);
  border-radius: 9px;
  outline: none;
  appearance: none;
  color: #d8f4f2;
  background:
    linear-gradient(45deg, transparent 50%, var(--cyan) 50%) right 8px center / 5px 5px no-repeat,
    rgba(16, 44, 51, 0.62);
  font-size: 0.72rem;
  font-weight: 690;
}

.layout-picker select:focus-visible {
  border-color: rgba(100, 229, 223, 0.62);
  box-shadow: 0 0 0 3px rgba(100, 229, 223, 0.1);
}

.pulse {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 11px rgba(100, 229, 223, 0.7);
}

.interval-hint {
  padding-left: 9px;
  border-left: 1px solid rgba(141, 178, 181, 0.2);
  color: var(--muted);
  font-weight: 480;
  letter-spacing: 0;
}

.note-readout {
  min-width: 0;
  display: flex;
  align-items: baseline;
  gap: 9px;
  text-align: center;
}

.note-name {
  max-width: 360px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.92rem;
  font-weight: 740;
  letter-spacing: 0.03em;
}

.note-detail {
  color: var(--muted);
  font-size: 0.7rem;
}

.labels-button {
  width: 62px;
  height: 32px;
  color: var(--cyan);
}

.labels-button[aria-pressed="false"] {
  color: var(--muted);
  background: transparent;
}

.keyboard-viewport {
  position: absolute;
  inset: var(--overview-reserve) 0 0;
  width: 100%;
  height: auto;
  overflow: hidden;
  border: 0;
  border-radius: 0;
  background:
    linear-gradient(115deg, rgba(18, 44, 51, 0.5), rgba(5, 16, 21, 0.72)),
    radial-gradient(circle at 50% 50%, rgba(70, 153, 157, 0.08), transparent 68%);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.035),
    0 20px 60px rgba(0, 0, 0, 0.18);
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

.keyboard-viewport::before,
.keyboard-viewport::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  z-index: 5;
  width: 26px;
  pointer-events: none;
}

.keyboard-viewport::before { left: 0; background: linear-gradient(90deg, rgba(4, 14, 18, 0.7), transparent); }
.keyboard-viewport::after { right: 0; background: linear-gradient(-90deg, rgba(4, 14, 18, 0.7), transparent); }

.keyboard {
  position: absolute;
  left: 50%;
  top: 50%;
  width: calc(var(--board-width-units) * var(--key-size));
  height: calc(var(--board-height-units) * var(--key-size));
  contain: layout paint style;
  transform: translate3d(calc(-50% + var(--pan-x, 0px)), -50%, 0);
  will-change: transform;
  touch-action: none;
}

.keyboard-overview {
  position: absolute;
  top: max(4px, env(safe-area-inset-top));
  left: 50%;
  z-index: 10;
  width: min(380px, calc(100% - 48px));
  height: var(--overview-height);
  opacity: 0;
  pointer-events: none;
  border: 1px solid rgba(151, 222, 224, 0.22);
  border-radius: 11px;
  background: rgba(4, 17, 23, 0.76);
  box-shadow: 0 5px 18px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transform: translate(-50%, -6px);
  transition: opacity 180ms ease, transform 180ms ease;
  touch-action: none;
}

.keyboard-overview.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, 0);
}

.keyboard-overview canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.overview-window {
  position: absolute;
  top: 2px;
  bottom: 2px;
  left: 0;
  width: 0;
  pointer-events: none;
  border: 1.5px solid rgba(167, 255, 247, 0.98);
  border-radius: 5px;
  background: rgba(100, 229, 223, 0.1);
  box-shadow: 0 0 10px rgba(100, 229, 223, 0.18), inset 0 0 0 1px rgba(2, 12, 16, 0.34);
  transform: translate3d(0, 0, 0);
  will-change: transform, width;
}

.hex-key {
  --key-a: #17333d;
  --key-b: #0d2029;
  --key-edge: rgba(116, 162, 169, 0.31);
  --key-glow: rgba(55, 119, 128, 0.2);
  position: absolute;
  left: calc(var(--x) * var(--key-size));
  top: calc(var(--y) * var(--key-size));
  width: calc(var(--key-size) - 4px);
  height: calc(var(--key-height) - 4px);
  padding: 0;
  display: grid;
  place-items: center;
  clip-path: polygon(50% 0, 100% 25%, 100% 75%, 50% 100%, 0 75%, 0 25%);
  background:
    radial-gradient(circle at 42% 32%, rgba(255, 255, 255, 0.12), transparent 34%),
    linear-gradient(145deg, var(--skin-key-a, var(--key-a)), var(--skin-key-b, var(--key-b)));
  filter: none;
  color: #afc9cc;
  cursor: pointer;
  touch-action: none;
  transform: rotate(-16.14deg);
  transition: transform 48ms ease-out, color 48ms ease-out;
}

.hex-key::before {
  content: "";
  position: absolute;
  inset: 4px;
  clip-path: inherit;
  border: 1px solid var(--skin-key-edge, var(--key-edge));
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.025), transparent 53%);
  box-shadow: inset 0 0 0 1px var(--instrument-color, transparent);
}

.hex-key::after {
  content: "";
  position: absolute;
  inset: 8px;
  opacity: 0;
  clip-path: inherit;
  background: radial-gradient(circle at 45% 36%, rgba(255, 255, 255, 0.72), rgba(255, 255, 255, 0.08) 42%, transparent 70%);
  transform: scale(0.82);
  transition: opacity 40ms ease-out, transform 70ms cubic-bezier(0.2, 0.9, 0.25, 1.35);
  pointer-events: none;
}

.hex-key.scale-key {
  --key-a: #18434b;
  --key-b: #0c2832;
  --key-edge: rgba(92, 214, 213, 0.42);
  color: #d1f2f0;
}

.hex-key.tonic-key {
  --key-a: #5a4325;
  --key-b: #2b2117;
  --key-edge: rgba(255, 198, 90, 0.6);
  color: #ffe8ad;
}

.hex-key.instrument-key {
  color: #f5fbfb;
  filter: none;
}

.keyboard[data-skin="piano"] .hex-key.natural-key {
  --skin-key-a: #fffefa;
  --skin-key-b: #cfd5d6;
  --skin-key-edge: rgba(255, 255, 255, 0.82);
  color: #172126;
}

.keyboard[data-skin="piano"] .hex-key.sharp-key {
  --skin-key-a: #293238;
  --skin-key-b: #070b0e;
  --skin-key-edge: rgba(173, 191, 197, 0.38);
  color: #f3f7f7;
}

.keyboard[data-skin="piano"] .hex-key.tonic-key {
  --skin-key-a: #fff6d7;
  --skin-key-b: #d9c88d;
  color: #3b3019;
}

.keyboard[data-skin="piano"] .hex-key.instrument-key::before {
  border-width: 2px;
  border-color: var(--instrument-color);
}

.keyboard[data-skin="wood"] .hex-key {
  --skin-key-a: #885b35;
  --skin-key-b: #392518;
  --skin-key-edge: rgba(224, 175, 115, 0.5);
  color: #fff0d8;
}

.keyboard[data-skin="wood"] .hex-key.sharp-key {
  --skin-key-a: #4a3425;
  --skin-key-b: #21170f;
  color: #e8d5bd;
}

.keyboard[data-skin="wood"] .hex-key.tonic-key {
  --skin-key-a: #b77a35;
  --skin-key-b: #533218;
}

.keyboard[data-skin="wood"] .hex-key.instrument-key::before {
  border-width: 2px;
  border-color: var(--instrument-color);
}

.hex-key.is-active {
  z-index: 4;
  color: white;
  transform: rotate(-16.14deg) translateY(3px) scale(0.905);
  filter: none;
}

.hex-key.is-active::before {
  background: radial-gradient(circle, rgba(255, 255, 255, 0.32), transparent 65%);
}

.hex-key.is-active::after {
  opacity: 0.82;
  transform: scale(1);
}

.key-label {
  position: relative;
  z-index: 2;
  display: grid;
  place-items: center;
  line-height: 1;
  pointer-events: none;
}

.key-label strong {
  font-size: calc(var(--key-size) * 0.2);
  font-weight: 650;
  letter-spacing: -0.04em;
}

.key-label small {
  margin-top: 4px;
  color: currentColor;
  opacity: 0.52;
  font-size: calc(var(--key-size) * 0.105);
  font-weight: 600;
}

.key-label i {
  margin-top: 3px;
  padding: 2px 4px;
  border: 1px solid currentColor;
  border-radius: 5px;
  opacity: 0.72;
  font-size: clamp(7px, calc(var(--key-size) * 0.08), 10px);
  font-style: normal;
  font-weight: 760;
  letter-spacing: 0.02em;
  line-height: 1;
}

.keyboard.hide-labels .key-label {
  opacity: 0;
}

.legend {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--muted);
  font-size: 0.67rem;
}

.legend span {
  display: flex;
  align-items: center;
  gap: 5px;
}

.swatch {
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: #162c35;
  border: 1px solid rgba(116, 162, 169, 0.4);
}

.swatch.tonic { background: #5a4325; border-color: var(--gold); }
.swatch.scale { background: #18434b; border-color: #5cd6d5; }

.bottom-row p {
  margin: 0;
  color: #607e83;
  font-size: 0.65rem;
}

.panic-button {
  height: 30px;
  padding: 0 11px;
  color: #9db5b7;
  font-size: 0.67rem;
  background: transparent;
}

.panic-button:active {
  color: #ffd0bd;
  background: rgba(177, 79, 50, 0.18);
}

.settings-handle {
  position: absolute;
  left: 50%;
  bottom: max(8px, env(safe-area-inset-bottom));
  z-index: 12;
  width: 74px;
  height: 28px;
  padding: 0;
  display: grid;
  place-items: center;
  border: 1px solid rgba(161, 217, 220, 0.13);
  border-radius: 999px;
  background: rgba(6, 20, 26, 0.46);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transform: translateX(-50%);
  transition: opacity 180ms ease, transform 180ms ease;
}

.settings-handle span,
.sheet-grabber span {
  display: block;
  width: 34px;
  height: 4px;
  border-radius: 99px;
  background: rgba(188, 226, 228, 0.72);
  box-shadow: 0 0 12px rgba(100, 229, 223, 0.2);
}

.settings-backdrop {
  position: absolute;
  inset: 0;
  z-index: 24;
  opacity: 0;
  pointer-events: none;
  background: rgba(1, 8, 11, 0.48);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  transition: opacity 220ms ease;
}

.settings-sheet {
  position: absolute;
  left: 50%;
  bottom: 0;
  z-index: 25;
  width: min(920px, calc(100% - 24px));
  max-height: min(72vh, 520px);
  padding: 7px 20px max(14px, env(safe-area-inset-bottom));
  overflow: auto;
  border: 1px solid rgba(164, 222, 224, 0.2);
  border-bottom: 0;
  border-radius: 28px 28px 0 0;
  background:
    radial-gradient(circle at 50% 0, rgba(62, 156, 162, 0.16), transparent 45%),
    rgba(7, 23, 30, 0.97);
  box-shadow: 0 -22px 70px rgba(0, 0, 0, 0.48), inset 0 1px 0 rgba(255, 255, 255, 0.04);
  transform: translate(-50%, calc(100% + 18px));
  transition: transform 280ms cubic-bezier(0.2, 0.82, 0.22, 1);
  pointer-events: none;
}

.settings-open .settings-backdrop {
  opacity: 1;
  pointer-events: auto;
}

.settings-open .settings-sheet {
  transform: translate(-50%, 0);
  pointer-events: auto;
}

.settings-open .settings-handle {
  opacity: 0;
  transform: translate(-50%, 18px);
  pointer-events: none;
}

.settings-open .performance-toggles {
  opacity: 0;
  pointer-events: none;
}

.sheet-grabber {
  width: 100%;
  height: 22px;
  padding: 0;
  display: grid;
  place-items: center;
  background: transparent;
}

.sheet-header {
  min-height: 56px;
  display: grid;
  grid-template-columns: 1fr minmax(180px, auto) 1fr;
  align-items: center;
  gap: 18px;
  border-bottom: 1px solid rgba(159, 207, 210, 0.12);
}

.sheet-header > div:first-child {
  display: grid;
  gap: 5px;
}

.sheet-header strong {
  font-size: 1.03rem;
  letter-spacing: 0.04em;
}

.sheet-header small {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  font-size: 0.69rem;
}

.sheet-header .note-readout {
  justify-self: center;
}

.done-button {
  justify-self: end;
  padding: 8px 14px;
  border-radius: 11px;
  color: var(--cyan);
  background: rgba(100, 229, 223, 0.1);
  font-size: 0.78rem;
  font-weight: 700;
}

.sheet-controls {
  width: 100%;
  margin-top: 14px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.count-control {
  height: 58px;
  min-width: 0;
  padding: 7px 9px;
  display: grid;
  align-content: center;
  gap: 3px;
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  background: rgba(12, 31, 39, 0.72);
}

.count-control > span {
  color: var(--muted);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
}

.count-control > div {
  display: grid;
  grid-template-columns: 34px 1fr 34px;
  align-items: center;
  text-align: center;
}

.column-count-control > div {
  grid-template-columns: 42px 28px minmax(28px, 1fr) 28px 42px;
  gap: 3px;
}

.count-control .bound-button {
  padding: 0 4px;
  color: #a9d9d8;
  font-size: 0.62rem;
  font-weight: 750;
  letter-spacing: 0.02em;
}

.count-control button {
  height: 26px;
  border-radius: 8px;
  color: var(--cyan);
  background: rgba(100, 229, 223, 0.08);
  font-size: 1rem;
}

.count-control button:disabled {
  color: #435b60;
  background: transparent;
}

.count-control strong {
  font-size: 0.82rem;
}

.settings-sheet .control-select,
.settings-sheet .volume-control,
.settings-sheet .transpose-control,
.settings-sheet .toggle-button,
.settings-sheet .labels-button,
.settings-sheet .panic-button {
  width: auto;
  height: 58px;
  min-width: 0;
}

.settings-sheet .control-select select {
  min-width: 0;
  width: 100%;
}

/* iPad/Safari may open a native light picker even when the page is dark. */
.settings-sheet select {
  color: #d8f4f2;
  color-scheme: light;
}

.settings-sheet select option,
.settings-sheet select optgroup {
  color: #10252b;
  background: #f5fbfa;
}

.settings-sheet .volume-control input {
  width: 100%;
}

.settings-sheet .labels-button,
.settings-sheet .panic-button {
  padding: 0 10px;
  border: 1px solid var(--panel-border);
  background: rgba(12, 31, 39, 0.72);
  color: #bbd0d2;
  font-size: 0.78rem;
}

.settings-sheet .labels-button[aria-pressed="true"] {
  color: var(--cyan);
  border-color: rgba(100, 229, 223, 0.3);
}

.settings-sheet .panic-button {
  color: #e8b4a2;
}

.ensemble-legend {
  grid-column: 1 / -1;
  min-height: 58px;
  padding: 9px 12px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 7px 13px;
  border: 1px solid rgba(164, 222, 224, 0.16);
  border-radius: 12px;
  background: rgba(8, 25, 32, 0.74);
  color: #c7dbdc;
  font-size: 0.7rem;
}

.ensemble-legend[hidden] {
  display: none;
}

.ensemble-legend strong {
  color: #eff8f7;
  font-size: 0.74rem;
}

.ensemble-legend span {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  white-space: nowrap;
}

.ensemble-legend span i {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--legend-color);
  box-shadow: 0 0 8px var(--legend-color);
}

.ensemble-legend small {
  margin-left: auto;
  color: var(--muted);
  font-size: 0.66rem;
}

.sheet-tip {
  margin: 11px 0 0;
  color: #68868a;
  text-align: center;
  font-size: 0.65rem;
}

.sheet-tip a {
  color: #88cac8;
  text-decoration: none;
  border-bottom: 1px solid rgba(136, 202, 200, 0.35);
}

.start-overlay {
  position: absolute;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  background: rgba(3, 12, 16, 0.58);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: opacity 280ms ease, visibility 280ms ease;
}

.start-overlay.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.start-overlay button {
  min-width: 260px;
  padding: 24px 34px 22px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(111, 225, 221, 0.38);
  border-radius: 24px;
  color: var(--text);
  background: linear-gradient(155deg, rgba(25, 69, 76, 0.96), rgba(9, 30, 38, 0.96));
  box-shadow: 0 22px 70px rgba(0, 0, 0, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.start-icon {
  width: 52px;
  height: 52px;
  margin-bottom: 12px;
  display: grid;
  place-items: center;
  border-radius: 18px;
  color: #082126;
  background: var(--cyan);
  box-shadow: 0 0 25px rgba(100, 229, 223, 0.35);
  font-size: 1.65rem;
  font-weight: 800;
}

.start-overlay strong {
  font-size: 1.12rem;
}

.start-overlay small {
  margin-top: 7px;
  color: #9ab7b9;
  font-size: 0.76rem;
}

.rotate-hint {
  display: none;
}

@media (max-width: 900px) {
  .brand-sub,
  .volume-control,
  .interval-hint,
  .bottom-row p {
    display: none;
  }

  .brand {
    grid-template-columns: 39px auto;
  }

  .brand-mark {
    transform: scale(0.87);
    transform-origin: left center;
  }

  .layout-readout {
    min-width: auto;
  }

  .layout-picker select {
    min-width: 118px;
  }

  .performance-layout-select {
    min-width: 104px;
    padding-inline: 9px;
  }

  .performance-toggle-button {
    min-width: 64px;
    padding-inline: 10px;
  }

  .settings-sheet {
    width: calc(100% - 14px);
    padding-inline: 14px;
  }

  .sheet-controls {
    grid-template-columns: repeat(3, 1fr);
  }

  .sheet-header {
    grid-template-columns: 1fr auto;
  }

  .sheet-header .note-readout {
    display: none;
  }
}

@media (max-width: 1080px) {
  .brand-sub,
  .volume-control {
    display: none;
  }

  .topbar {
    gap: 10px;
  }

  .settings-sheet .volume-control {
    display: grid;
  }
}

@media (max-height: 560px) and (orientation: landscape) {
  .topbar {
    height: calc(64px + env(safe-area-inset-top));
    padding-top: max(7px, env(safe-area-inset-top));
    padding-bottom: 7px;
  }

  .control-select,
  .transpose-control,
  .toggle-button {
    height: 42px;
  }

  .brand-mark { transform: scale(0.78); transform-origin: left center; }
  .brand-name { font-size: 1.12rem; }
  .bottom-row { min-height: 0; }
}

@media (orientation: portrait) and (max-width: 900px) {
  .topbar,
  .play-surface,
  .start-overlay,
  .settings-handle,
  .settings-sheet,
  .settings-backdrop {
    display: none;
  }

  .rotate-hint {
    position: absolute;
    inset: 0;
    z-index: 50;
    display: grid;
    place-content: center;
    justify-items: center;
    gap: 9px;
    text-align: center;
    background: radial-gradient(circle at center, #10323a, #061117 64%);
  }

  .rotate-hint span {
    display: grid;
    place-items: center;
    width: 64px;
    height: 64px;
    margin-bottom: 12px;
    border: 1px solid rgba(100, 229, 223, 0.42);
    border-radius: 22px;
    color: var(--cyan);
    font-size: 2.1rem;
  }

  .rotate-hint strong { font-size: 1.2rem; }
  .rotate-hint small { color: var(--muted); font-size: 0.82rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.001ms !important;
  }
}