.reference-subject-controls {
  display: grid;
  grid-template-columns: minmax(180px, 260px) minmax(0, 1fr);
  gap: 10px 14px;
  align-items: end;
  margin-top: 8px;
}

.reference-subject-controls .field {
  max-width: 260px;
}

.custom-reference-panel {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 14px;
  padding: 12px;
  border: 1px solid var(--rule);
  background: var(--paper);
}

.custom-reference-source,
.custom-reference-scale {
  min-width: 0;
}

.custom-reference-source {
  display: grid;
  gap: 7px;
}

.custom-reference-source textarea {
  min-height: 112px;
  resize: vertical;
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 8px 9px;
  color: var(--ink);
  background: var(--paper);
  font: 0.78rem/1.35 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.custom-reference-source textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
  outline: none;
}

.custom-reference-file {
  display: grid;
  gap: 4px;
  color: var(--ink-2);
  font-size: 0.72rem;
}

.custom-reference-file input[type='file'] {
  height: auto;
  padding: 6px 8px;
  font-size: 0.8rem;
}

.custom-reference-scale {
  display: grid;
  align-content: start;
  gap: 8px;
}

.custom-reference-scale-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr) minmax(64px, 0.7fr);
  gap: 6px;
}

.custom-reference-scale button {
  min-height: 36px;
  border: 1px solid var(--ink);
  border-radius: 2px;
  padding: 0 12px;
  color: var(--paper);
  background: var(--ink);
  cursor: pointer;
}

.custom-reference-scale button:hover {
  opacity: 0.88;
}

.custom-reference-help,
.custom-reference-bounds,
.custom-reference-status {
  margin: 0;
  color: var(--ink-2);
  font-size: 0.75rem;
}

.custom-reference-status {
  min-height: 1.35em;
}

.custom-svg-measurement {
  position: absolute;
  left: -100000px;
  top: -100000px;
  width: 1000px;
  height: 1000px;
  overflow: visible;
  visibility: hidden;
  pointer-events: none;
}

@media (max-width: 720px) {
  .reference-subject-controls,
  .custom-reference-panel {
    grid-template-columns: 1fr;
  }

  .custom-reference-panel {
    grid-column: 1;
  }

  .reference-subject-controls .field {
    max-width: none;
  }
}