.instrumented-formula-builder {
  margin-top: .85rem;
  border: 1px solid var(--ksi-border);
  border-radius: .65rem;
  background: color-mix(in srgb, var(--bs-card-bg) 92%, var(--ksi-accent) 8%);
  overflow: hidden;
}

.instrumented-formula-builder__header,
.instrumented-formula-builder__footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .6rem;
  padding: .65rem .75rem;
}

.instrumented-formula-builder__header {
  border-bottom: 1px solid var(--ksi-border);
}

.instrumented-formula-builder__title {
  color: var(--ksi-ink);
  font-size: .82rem;
  font-weight: 760;
}

.instrumented-formula-builder__help,
.instrumented-formula-builder__status {
  color: var(--ksi-muted);
  font-size: .72rem;
}

.instrumented-formula-builder__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
}

.formula-builder-zoom__value {
  min-width: 3.75rem;
  font-variant-numeric: tabular-nums;
}

.instrumented-formula-builder__layout {
  display: grid;
  grid-template-columns: minmax(180px, 230px) minmax(0, 1fr);
  min-height: 570px;
}

.formula-builder-palette {
  padding: .65rem;
  border-right: 1px solid var(--ksi-border);
  background: color-mix(in srgb, var(--bs-body-bg) 86%, var(--ksi-accent) 14%);
  overflow: auto;
}

.formula-builder-palette__group + .formula-builder-palette__group {
  margin-top: .75rem;
}

.formula-builder-palette__title {
  margin-bottom: .35rem;
  color: var(--ksi-muted);
  font-size: .64rem;
  font-weight: 780;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.formula-builder-palette__buttons {
  display: flex;
  flex-wrap: wrap;
  gap: .3rem;
}

.formula-builder-module-chip {
  padding: .32rem .45rem;
  border: 1px solid var(--ksi-border);
  border-radius: .35rem;
  background: var(--bs-card-bg);
  color: var(--ksi-ink);
  font-size: .68rem;
  font-weight: 680;
  line-height: 1.15;
  cursor: grab;
}

.formula-builder-module-chip:hover,
.formula-builder-module-chip:focus-visible {
  border-color: var(--ksi-accent);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--ksi-accent) 20%, transparent);
}

.formula-builder-module-chip--pitch { border-left: 4px solid #5b8def; }
.formula-builder-module-chip--voice { border-left: 4px solid #8b67d5; }
.formula-builder-module-chip--compose { border-left: 4px solid #b0772f; }
.formula-builder-module-chip--transform { border-left: 4px solid #bd5e88; }
.formula-builder-module-chip--output { border-left: 4px solid #4f8f69; }
.formula-builder-module-chip--rhythm { border-left: 4px solid #2b9c9c; }
.formula-builder-module-chip--neutral { border-left: 4px solid #7b838b; }

.formula-builder-viewport {
  position: relative;
  min-width: 0;
  overflow: auto;
  background-color: color-mix(in srgb, var(--bs-body-bg) 92%, var(--ksi-accent) 8%);
  background-image:
    linear-gradient(color-mix(in srgb, var(--ksi-border) 42%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--ksi-border) 42%, transparent) 1px, transparent 1px);
  background-size: 24px 24px;
}

.formula-builder-surface {
  position: relative;
  width: 1580px;
  height: 2200px;
}

.formula-builder-zone {
  --node-accent: var(--ksi-accent);
  position: absolute;
  z-index: 0;
  min-width: 300px;
  min-height: 180px;
  overflow: hidden;
  resize: both;
  border: 2px dashed color-mix(in srgb, var(--ksi-accent) 52%, var(--ksi-border));
  border-radius: .75rem;
  background: color-mix(in srgb, var(--ksi-accent) 7%, transparent);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--bs-card-bg) 65%, transparent);
}

.formula-builder-zone__header {
  display: flex;
  align-items: center;
  gap: .5rem;
  min-height: 2rem;
  padding: .32rem .45rem;
  border-bottom: 1px dashed color-mix(in srgb, var(--ksi-accent) 42%, var(--ksi-border));
  background: color-mix(in srgb, var(--bs-card-bg) 82%, var(--ksi-accent) 18%);
  cursor: move;
  touch-action: none;
  user-select: none;
}

.formula-builder-zone__label {
  min-width: 7rem;
  max-width: 16rem;
  padding: .16rem .3rem;
  border: 1px solid transparent;
  border-radius: .25rem;
  background: transparent;
  color: var(--ksi-ink);
  font-size: .7rem;
  font-weight: 760;
}

.formula-builder-zone__label:focus {
  border-color: var(--ksi-accent);
  background: var(--bs-card-bg);
  outline: 0;
}

.formula-builder-zone__summary {
  margin-left: auto;
  color: var(--ksi-muted);
  font-size: .62rem;
  white-space: nowrap;
}

.formula-builder-zone__remove {
  width: 1.35rem;
  height: 1.35rem;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--ksi-muted);
  font-size: 1rem;
  line-height: 1;
}

.formula-builder-zone__remove:hover,
.formula-builder-zone__remove:focus-visible {
  background: var(--bs-danger);
  color: #fff;
}

.formula-builder-zone--transform-drop.is-transform-over {
  border-color: #bd5e88;
  background: color-mix(in srgb, #bd5e88 15%, transparent);
  box-shadow: 0 0 0 5px color-mix(in srgb, #bd5e88 24%, transparent) inset;
}

.formula-builder-zone--transform-drop.is-transform-over .formula-builder-zone__header::after {
  margin-left: .35rem;
  color: #bd5e88;
  content: "attach transform to group";
  font-size: .58rem;
  font-weight: 780;
}

.formula-builder-zone__ports {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.formula-builder-zone__timeline {
  position: absolute;
  right: .55rem;
  bottom: .35rem;
  left: .55rem;
  z-index: 3;
  display: flex;
  justify-content: space-between;
  pointer-events: none;
}

.formula-builder-zone .formula-builder-zone-port {
  position: absolute;
  top: 50%;
  z-index: 3;
  pointer-events: auto;
}

.formula-builder-zone-port--input {
  left: .25rem;
}

.formula-builder-zone-port--output {
  right: .25rem;
  margin-left: 0;
}

.formula-builder-wires {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
}

.formula-builder-wire {
  fill: none;
  stroke: color-mix(in srgb, var(--ksi-accent) 76%, var(--ksi-ink));
  stroke-width: 3;
  vector-effect: non-scaling-stroke;
}

.formula-builder-time-wire {
  fill: none;
  stroke: color-mix(in srgb, #8b67d5 78%, var(--ksi-ink));
  stroke-width: 2.5;
  stroke-dasharray: 7 5;
  vector-effect: non-scaling-stroke;
  pointer-events: none;
}

.formula-builder-time-wire-hit {
  fill: none;
  stroke: transparent;
  stroke-width: 14;
  pointer-events: stroke;
  cursor: pointer;
}

.formula-builder-wire-hit {
  fill: none;
  stroke: transparent;
  stroke-width: 16;
  pointer-events: stroke;
  cursor: pointer;
}

.formula-builder-wire-hit:hover + .formula-builder-wire,
.formula-builder-wire:hover {
  stroke: var(--bs-danger);
}

.formula-builder-node {
  position: absolute;
  z-index: 2;
  width: 230px;
  border: 1px solid color-mix(in srgb, var(--ksi-border) 78%, var(--node-accent, var(--ksi-accent)) 22%);
  border-radius: .5rem;
  background: color-mix(in srgb, var(--bs-card-bg) 96%, var(--node-accent, var(--ksi-accent)) 4%);
  box-shadow: 0 .35rem 1rem color-mix(in srgb, #000 12%, transparent);
}

.formula-builder-node.is-in-zone {
  box-shadow:
    0 0 0 2px color-mix(in srgb, var(--ksi-accent) 28%, transparent),
    0 .35rem 1rem color-mix(in srgb, #000 12%, transparent);
}

.formula-builder-node.is-selected {
  border-color: var(--ksi-accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--ksi-accent) 30%, transparent);
}

.formula-builder-node--source-drop::after {
  position: absolute;
  top: .35rem;
  right: 2rem;
  padding: .12rem .3rem;
  border: 1px dashed color-mix(in srgb, #bd5e88 60%, var(--ksi-border));
  border-radius: .25rem;
  background: color-mix(in srgb, var(--bs-card-bg) 88%, #bd5e88 12%);
  color: color-mix(in srgb, #bd5e88 74%, var(--ksi-ink));
  content: "drop transform";
  font-size: .5rem;
  font-weight: 760;
  letter-spacing: .02em;
  pointer-events: none;
}

.formula-builder-node--source-drop.is-transform-over {
  border-color: #bd5e88;
  box-shadow: 0 0 0 4px color-mix(in srgb, #bd5e88 28%, transparent);
}

.formula-builder-node--pitch { --node-accent: #5b8def; }
.formula-builder-node--voice { --node-accent: #8b67d5; }
.formula-builder-node--compose { --node-accent: #b0772f; }
.formula-builder-node--transform { --node-accent: #bd5e88; }
.formula-builder-node--output { --node-accent: #4f8f69; }
.formula-builder-node--rhythm { --node-accent: #2b9c9c; }
.formula-builder-node--neutral { --node-accent: #7b838b; }

.formula-builder-node__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .5rem;
  min-height: 2rem;
  padding: .38rem .5rem;
  border-bottom: 1px solid var(--ksi-border);
  border-radius: .48rem .48rem 0 0;
  background: color-mix(in srgb, var(--bs-card-bg) 76%, var(--node-accent) 24%);
  color: var(--ksi-ink);
  font-size: .72rem;
  font-weight: 760;
  cursor: move;
  touch-action: none;
  user-select: none;
}

.formula-builder-node__remove {
  width: 1.35rem;
  height: 1.35rem;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--ksi-muted);
  font-size: 1rem;
  line-height: 1;
}

.formula-builder-node__remove:hover,
.formula-builder-node__remove:focus-visible {
  background: var(--bs-danger);
  color: #fff;
}

.formula-builder-selection-rect {
  position: absolute;
  z-index: 6;
  border: 1px solid color-mix(in srgb, var(--ksi-accent) 82%, white);
  border-radius: .25rem;
  background: color-mix(in srgb, var(--ksi-accent) 18%, transparent);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--ksi-accent) 20%, transparent) inset;
  pointer-events: none;
}

.formula-builder-node__ports {
  display: flex;
  justify-content: space-between;
  height: 0;
  padding: 0 .45rem;
}

.formula-builder-port {
  position: relative;
  z-index: 3;
  width: 1rem;
  height: 1rem;
  padding: 0;
  transform: translateY(-50%);
  border: 2px solid var(--bs-card-bg);
  border-radius: 50%;
  background: var(--node-accent);
  box-shadow: 0 0 0 1px var(--ksi-border);
  cursor: crosshair;
}

.formula-builder-port--output {
  margin-left: auto;
}

.formula-builder-port.is-pending {
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--node-accent) 35%, transparent);
}

.formula-builder-node__body {
  display: grid;
  gap: .4rem;
  padding: .7rem .55rem .55rem;
}

.formula-builder-node__timeline {
  display: flex;
  min-height: 1.5rem;
  align-items: center;
  justify-content: space-between;
  gap: .5rem;
  padding: .2rem .45rem .35rem;
}

.formula-builder-time-port {
  display: inline-flex;
  align-items: center;
  gap: .2rem;
  padding: .15rem .2rem;
  border: 0;
  border-radius: .3rem;
  background: transparent;
  color: color-mix(in srgb, #8b67d5 76%, var(--ksi-ink));
  font: 750 .56rem/1 var(--bs-font-monospace);
  white-space: nowrap;
  cursor: crosshair;
}

.formula-builder-time-port::before {
  width: .58rem;
  height: .58rem;
  border: 2px solid var(--bs-card-bg);
  border-radius: 50%;
  background: #8b67d5;
  box-shadow: 0 0 0 1px var(--ksi-border);
  content: "";
}

.formula-builder-time-port--output {
  flex-direction: row-reverse;
}

.formula-builder-time-port:hover,
.formula-builder-time-port:focus-visible,
.formula-builder-time-port.is-pending {
  background: color-mix(in srgb, #8b67d5 18%, transparent);
  outline: 1px solid color-mix(in srgb, #8b67d5 55%, transparent);
}

.formula-builder-node__field {
  display: grid;
  gap: .18rem;
  min-width: 0;
  color: var(--ksi-muted);
  font-size: .62rem;
  font-weight: 680;
}

.formula-builder-node__field input,
.formula-builder-node__field select,
.formula-builder-node__field textarea {
  width: 100%;
  min-width: 0;
  padding: .28rem .35rem;
  border: 1px solid var(--ksi-border);
  border-radius: .3rem;
  background: color-mix(in srgb, var(--bs-body-bg) 88%, var(--bs-card-bg) 12%);
  color: var(--ksi-ink);
  font: 650 .68rem/1.25 var(--bs-font-monospace);
}

.instrumented-formula-builder__footer {
  align-items: flex-start;
  border-top: 1px solid var(--ksi-border);
}

.formula-builder-preview {
  flex: 1 1 30rem;
  max-height: 8rem;
  margin: 0;
  padding: .5rem .6rem;
  border: 1px solid var(--ksi-border);
  border-radius: .4rem;
  background: color-mix(in srgb, var(--bs-body-bg) 90%, var(--ksi-accent) 10%);
  color: var(--ksi-ink);
  font-size: .7rem;
  white-space: pre-wrap;
  overflow: auto;
}

.formula-builder-preview.is-error {
  border-color: var(--bs-danger);
  color: var(--bs-danger);
}

@media (max-width: 991.98px) {
  .instrumented-formula-builder__layout {
    grid-template-columns: 1fr;
  }

  .formula-builder-palette {
    max-height: 220px;
    border-right: 0;
    border-bottom: 1px solid var(--ksi-border);
  }

  .formula-builder-viewport {
    min-height: 520px;
  }
}