.stack__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-4);
  margin-top: var(--sp-6);
}

.stack__col {
  border-left: 1px solid var(--param-cyan);
  padding-left: var(--sp-3);
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.stack__col-title {
  font-family: var(--ff-mono);
  font-size: var(--fs-mono-xs);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--param-cyan);
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--hairline);
}

.stack__list {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.stack__item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--ff-ui);
  font-size: var(--fs-sm);
  color: var(--ash);
}
.stack__item::before {
  content: '';
  width: 4px;
  height: 4px;
  background: var(--param-cyan);
  flex-shrink: 0;
}

@media (max-width: 900px) { .stack__grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .stack__grid { grid-template-columns: 1fr; } }