.algorithm-demo {
  --algorithm-border: var(--table-border-color);
  --algorithm-surface: var(--quote-bg);
  --algorithm-active: color-mix(in srgb, var(--links) 20%, var(--bg));
  margin: 1.5rem 0 2.25rem;
  padding: 1rem;
  border: 1px solid var(--algorithm-border);
  border-radius: 12px;
  background: var(--algorithm-surface);
}

.algorithm-demo-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  justify-content: center;
  gap: 0.65rem;
}

.algorithm-demo-field {
  display: grid;
  gap: 0.25rem;
  color: var(--icons);
  font-size: 0.88em;
}

.algorithm-demo select,
.algorithm-demo button {
  min-height: 40px;
  padding: 0.48rem 0.75rem;
  border: 1px solid var(--algorithm-border);
  border-radius: 7px;
  background: var(--bg);
  color: var(--fg);
  cursor: pointer;
  font: inherit;
}

.algorithm-demo button:hover:not(:disabled) {
  background: var(--table-header-bg);
}

.algorithm-demo button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.binary-search-stage {
  padding: 1.4rem 0 0.7rem;
}

.binary-search-array {
  display: grid;
  grid-template-columns: repeat(9, minmax(2.25rem, 1fr));
  gap: 0.4rem;
}

.binary-search-cell {
  position: relative;
  display: grid;
  min-height: 64px;
  place-items: center;
  border: 1px solid var(--algorithm-border);
  border-radius: 7px;
  background: var(--bg);
  font-family: var(--mono-font);
  font-variant-numeric: tabular-nums;
  transition: opacity 180ms ease, transform 180ms ease, background-color 180ms ease;
}

.binary-search-cell.is-outside {
  opacity: 0.28;
}

.binary-search-cell.is-next {
  transform: translateY(-4px);
  border-color: var(--links);
  background: var(--algorithm-active);
}

.binary-search-cell.is-result {
  border-color: var(--links);
  background: var(--algorithm-active);
  font-weight: 700;
}

.binary-search-index {
  position: absolute;
  inset-block-end: 0.24rem;
  color: var(--icons);
  font-size: 0.7em;
}

.binary-search-marker {
  position: absolute;
  inset-block-start: -1.2rem;
  color: var(--links);
  font-family: var(--mono-font);
  font-size: 0.72em;
  font-weight: 700;
}

.binary-search-range,
.algorithm-demo-status {
  text-align: center;
}

.binary-search-range {
  margin-top: 0.65rem;
  color: var(--icons);
  font-family: var(--mono-font);
  font-size: 0.88em;
}

.algorithm-demo-status {
  min-height: 2.8rem;
  margin: 0.65rem 0 0;
}

@media (max-width: 560px) {
  .algorithm-demo {
    padding: 0.75rem;
  }

  .binary-search-array {
    gap: 0.2rem;
    grid-template-columns: repeat(9, minmax(1.85rem, 1fr));
  }

  .binary-search-cell {
    min-height: 56px;
    font-size: 0.82em;
  }

  .algorithm-demo-controls button {
    min-height: 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .binary-search-cell {
    transition: none;
  }
}