.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 48;
  background: transparent;
  pointer-events: none;
}

.scroll-progress__bar {
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-deep), var(--accent));
  box-shadow: 0 0 12px rgba(255, 61, 143, 0.6);
  transition: width 0.08s linear;
}

@media (prefers-reduced-motion: reduce) {
  .scroll-progress__bar {
    transition: none;
  }
}

.back-to-top {
  position: fixed;
  right: clamp(1rem, 3vw, 2rem);
  bottom: clamp(1rem, 3vw, 2rem);
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border: none;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-deep), var(--accent));
  color: var(--surface);
  font-size: 1.1rem;
  box-shadow: 0 12px 28px -10px rgba(255, 61, 143, 0.6);
  cursor: pointer;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition:
    opacity 0.3s ease,
    transform 0.3s ease;
}

.back-to-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top:hover {
  box-shadow: 0 14px 32px -8px rgba(255, 61, 143, 0.75);
}

@media (prefers-reduced-motion: reduce) {
  .back-to-top {
    transition: opacity 0.3s ease;
  }
}

@media (max-width: 480px) {
  .back-to-top {
    width: 2.6rem;
    height: 2.6rem;
    font-size: 1rem;
  }
}