uc-progress-bar {
  --l-progress-value: 0;

  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  pointer-events: none;
  transition: opacity 0.3s;
  opacity: 1;
}

uc-progress-bar.uc-progress-bar--hidden {
  opacity: 0;
}

uc-progress-bar .uc-progress {
  position: absolute;
  width: calc(var(--l-progress-value) * 1%);
  height: 100%;
  background-color: var(--uc-primary);
  transform: translateX(0);
  opacity: 1;
  transition:
    width 0.6s,
    opacity 0.3s;
}

uc-progress-bar .uc-progress--hidden {
  opacity: 0;
}

uc-progress-bar .uc-fake-progress {
  --l-fake-progress-width: 30;

  position: absolute;
  width: calc(var(--l-fake-progress-width) * 1%);
  height: 100%;
  background-color: var(--uc-primary);
  animation: fake-progress-animation 1s ease-in-out infinite;
  opacity: 1;
  transition: opacity 0.3s;
  z-index: 1;
}

uc-progress-bar .uc-fake-progress--hidden {
  opacity: 0;
  animation: none;
}

@keyframes fake-progress-animation {
  from {
    transform: translateX(-100%);
  }

  to {
    transform: translateX(calc(100 / var(--l-fake-progress-width) * 100 * 1%));
  }
}