.area-explorer {
  display: grid;
  gap: var(--space-4, 1rem);
  color: var(--color-text, #172033);
}

.area-explorer__controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr));
  gap: var(--space-3, .75rem);
  align-items: end;
}

.area-explorer__select-label,
.area-explorer__split-slider {
  display: grid;
  gap: .4rem;
  font-weight: 700;
}

.area-explorer__select {
  min-height: 44px;
  width: 100%;
  border: 1px solid var(--color-border, #cbd5e1);
  border-radius: .65rem;
  padding: .55rem .7rem;
  background: var(--color-surface, #fff);
  color: inherit;
}

.area-explorer__limit-controls {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .75rem;
}

.area-explorer__button-row {
  display: flex;
  gap: .5rem;
  flex-wrap: wrap;
}

.area-explorer__button,
.area-explorer__split-remove {
  min-height: 44px;
  border: 1px solid var(--mode-accent, #3157a4);
  border-radius: .7rem;
  padding: .55rem .8rem;
  background: var(--mode-accent, #3157a4);
  color: var(--mode-accent-text, #fff);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.area-explorer__button--secondary,
.area-explorer__split-remove {
  background: var(--color-surface, #fff);
  color: var(--color-text, #172033);
  border-color: var(--color-border-strong, #94a3b8);
}

.area-explorer__button:disabled {
  opacity: .5;
  cursor: not-allowed;
}

.area-explorer__card {
  border: 1px solid var(--color-border, #d7dce5);
  border-radius: 1rem;
  background: var(--color-surface, #fff);
  overflow: hidden;
}

.area-explorer__card-heading {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
  padding: .85rem 1rem .15rem;
}

.area-explorer__title {
  margin: 0;
  font-size: 1rem;
}

.area-explorer__expression {
  margin: 0;
  font-weight: 700;
  color: var(--color-text-muted, #526075);
}

.area-explorer__diagram {
  min-width: 0;
}


.area-explorer .diagram-primitives__tone--area-positive { color: #0F766E; }
.area-explorer .diagram-primitives__tone--area-negative { color: #B54708; }
.area-explorer .diagram-primitives__tone--root { color: #667085; }
.area-explorer .diagram-primitives__tone--limit { color: #7A5AF8; }
.area-explorer .diagram-primitives__tone--split { color: #475467; }

.area-explorer__region--positive {
  stroke: currentColor;
  stroke-width: 2.5px;
  stroke-dasharray: none;
}

.area-explorer__region--negative {
  stroke: currentColor;
  stroke-width: 2.5px;
  stroke-dasharray: 10 8;
}

.area-explorer__region-sign {
  font-size: 28px;
  font-weight: 900;
  paint-order: stroke;
  stroke: var(--color-surface, #fff);
  stroke-width: 5px;
  stroke-linejoin: round;
}

.area-explorer__root-guide {
  opacity: .32;
  stroke-width: 1.5px;
}

.area-explorer__root-label {
  font-size: 13px;
  font-weight: 700;
}

.area-explorer__limit-guide {
  opacity: .68;
  stroke-width: 2px;
}

.area-explorer__split-guide {
  opacity: .48;
  stroke-width: 1.5px;
  stroke-dasharray: 2 9;
}

.area-explorer__split-label,
.area-explorer__limit-label {
  font-size: 14px;
  font-weight: 800;
  paint-order: stroke;
  stroke: var(--color-surface, #fff);
  stroke-width: 4px;
}

.area-explorer__legend {
  display: flex;
  flex-wrap: wrap;
  gap: .55rem;
  font-size: .9rem;
}

.area-explorer__legend-item {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  border: 1px solid var(--color-border, #d7dce5);
  border-radius: 999px;
  padding: .35rem .65rem;
  background: var(--color-surface, #fff);
}

.area-explorer__legend-item > span {
  display: inline-grid;
  place-items: center;
  min-width: 1.45rem;
  min-height: 1.45rem;
  border-radius: .35rem;
  font-weight: 900;
}

.area-explorer__legend-item--positive > span {
  border: 2px solid currentColor;
}

.area-explorer__legend-item--negative > span {
  border: 2px dashed currentColor;
}

.area-explorer__legend-item--split > span {
  border-left: 2px dotted currentColor;
  border-right: 2px dotted currentColor;
}

.area-explorer__readout {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 150px), 1fr));
  gap: .65rem;
}

.area-explorer__metric {
  display: grid;
  gap: .2rem;
  min-width: 0;
  border: 1px solid var(--color-border, #d7dce5);
  border-radius: .8rem;
  padding: .7rem .8rem;
  background: var(--color-surface, #fff);
}

.area-explorer__metric span {
  color: var(--color-text-muted, #526075);
  font-size: .78rem;
  font-weight: 700;
}

.area-explorer__metric strong {
  font-size: 1.05rem;
  overflow-wrap: anywhere;
}

.area-explorer__metric--secondary strong {
  font-size: .9rem;
}

.area-explorer__split-controls {
  display: grid;
  gap: .6rem;
}

.area-explorer__split-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: .75rem;
  align-items: end;
  border: 1px solid var(--color-border, #d7dce5);
  border-radius: .8rem;
  padding: .7rem .8rem;
  background: var(--color-surface, #fff);
}

.area-explorer__split-heading-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.area-explorer__split-input {
  width: 100%;
  min-height: var(--touch-target-min, 44px);
}

.area-explorer__split-empty,
.area-explorer__note {
  margin: 0;
  color: var(--color-text-muted, #526075);
}

.area-explorer__note {
  padding: .8rem 1rem;
  border-left: 4px solid var(--mode-accent, #3157a4);
  background: var(--mode-soft, #eef3ff);
  border-radius: .3rem .8rem .8rem .3rem;
}

@media (max-width: 980px) {
  .area-explorer__controls {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr);
  }

  .area-explorer__button-row {
    grid-column: 1 / -1;
  }

  .area-explorer__readout {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .area-explorer__controls,
  .area-explorer__limit-controls,
  .area-explorer__readout {
    grid-template-columns: 1fr;
  }

  .area-explorer__button-row {
    grid-column: auto;
  }

  .area-explorer__card-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: .25rem;
  }

  .area-explorer__split-row {
    grid-template-columns: 1fr;
  }

  .area-explorer__split-remove {
    justify-self: start;
  }
}