.top-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  z-index: 10000;
  pointer-events: none;
  opacity: 0;
  transform: translateY(-6px);
  transition: opacity 140ms ease, transform 140ms ease;
}

.top-progress--background {
  height: 6px;
  opacity: 0;
}

.top-progress--active {
  opacity: 0.85;
  transform: translateY(0);
}

.top-progress--active.top-progress--background {
  opacity: 0.55;
}

.top-progress__bar {
  position: relative;
  overflow: hidden;
  width: 100%;
  height: 100%;
  transform-origin: 0 50%;
  transform: scaleX(0);
  transition: transform 260ms ease;
  /* Smooth continuous gradient "slide" (no discrete stripes). Implemented via ::before to avoid jump-back. */
  background: transparent;
  box-shadow: 0 0 10px rgba(59, 166, 246, 0.25);
}

.top-progress__bar::before {
  content: '';
  position: absolute;
  inset: 0;
  width: 200%;
  height: 100%;
  background: linear-gradient(
    90deg,
    var(--color-info),
    var(--color-primary-pink),
    var(--color-accent),
    var(--color-warning),
    var(--color-info)
  );
  transform: translateX(0);
  animation: top-progress-pan 8s linear infinite;
}

@keyframes top-progress-pan {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-50%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .top-progress__bar::before {
    animation: none;
    background: var(--color-accent);
    width: 100%;
    transform: none;
  }
}