.loader {
  display: flex;
  gap: 4px;
  position: fixed;
  z-index: 2000;
  inset: 0;
  background: rgba(255,255,255,0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  }

.bar {
  width: 6px;
  height: 20px;
  background: #212529;
  animation: pulse 0.7s infinite ease-in-out;
  opacity: 0.6;
  margin: -1px;
  display: inline-block;
}

.bar:nth-child(1) {
  --scale: 1.2; /* pequeña */
  animation-delay: 0s;
}

.bar:nth-child(2) {
  --scale: 2; /* mediana */
  animation-delay: 0.1s;
}

.bar:nth-child(3) {
  --scale: 2.5;   /* grande */
  animation-delay: 0.2s;
}

.bar:nth-child(4) {
  --scale: 2; /* mediana */
  animation-delay: 0.3s;
}

.bar:nth-child(5) {
  --scale: 1.2; /* pequeña */
  animation-delay: 0.4s;
}

@keyframes pulse {
  0%, 100% {
    transform: scaleY(1);
  }
  50% {
    transform: scaleY(var(--scale));
  }
}