/* ── STACK TÉCNICO ── */
#stack {
  padding: 120px 5%;
  background: var(--bg);
}

.stack-wrapper {
  max-width: 1100px;
  margin: 0 auto;
}

/* ── GRID DE CATEGORÍAS ── */
.stack-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 64px;
}

.stack-category {
  background: var(--bg2);
  border: 0.5px solid var(--border);
  border-radius: 14px;
  padding: 28px;
  opacity: 0;
  transform: translateY(24px);
}

.stack-category.visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.stack-category-label {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.stack-category-label.teal {
  color: var(--teal);
}

.stack-category-label::before {
  content: '';
  display: block;
  width: 16px;
  height: 1px;
  background: currentColor;
}

/* ── PILLS DE TECNOLOGÍAS ── */
.stack-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.stack-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: 20px;
  background: rgba(55, 138, 221, 0.08);
  color: var(--blue-lt);
  border: 0.5px solid rgba(55, 138, 221, 0.18);
  transition: background 0.2s, border-color 0.2s, transform 0.15s;
  cursor: default;
}

.stack-pill:hover {
  background: rgba(55, 138, 221, 0.16);
  border-color: rgba(55, 138, 221, 0.4);
  transform: translateY(-2px);
}

.stack-pill.teal {
  background: rgba(29, 158, 117, 0.08);
  color: var(--teal);
  border-color: rgba(29, 158, 117, 0.18);
}

.stack-pill.teal:hover {
  background: rgba(29, 158, 117, 0.16);
  border-color: rgba(29, 158, 117, 0.4);
}

.stack-pill.muted {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
  border-color: rgba(255, 255, 255, 0.08);
}

.stack-pill.muted:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.15);
}

/* Punto indicador dentro del pill */
.stack-pill-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.6;
  flex-shrink: 0;
}

/* ── BARRA DE CONFIANZA ── */
.stack-trust {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  padding: 40px;
  background: var(--bg2);
  border: 0.5px solid var(--border);
  border-radius: 14px;
  flex-wrap: wrap;
  opacity: 0;
  transform: translateY(20px);
}

.stack-trust.visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.5s ease 0.3s, transform 0.5s ease 0.3s;
}

.stack-trust-item {
  text-align: center;
}

.stack-trust-num {
  font-family: var(--font-head);
  font-size: 28px;
  font-weight: 800;
  color: var(--blue);
  line-height: 1;
  letter-spacing: -1px;
  margin-bottom: 4px;
}

.stack-trust-num.teal {
  color: var(--teal);
}

.stack-trust-label {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 300;
}

.stack-trust-divider {
  width: 0.5px;
  height: 40px;
  background: var(--border);
}

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  .stack-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 560px) {
  #stack { padding: 80px 5%; }

  .stack-grid {
    grid-template-columns: 1fr;
  }

  .stack-trust {
    gap: 28px;
    padding: 28px;
  }

  .stack-trust-divider {
    display: none;
  }
}