.scroll-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-text-on-primary);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s ease;
  z-index: 100;
}

[data-theme="dark"] .scroll-to-top {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

.scroll-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-to-top:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

.scroll-to-top:active {
  transform: translateY(0);
}

.scroll-to-top i {
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

@media (max-width: 640px) {
  .scroll-to-top {
    bottom: 16px;
    right: 16px;
    width: 44px;
    height: 44px;
  }

  .scroll-to-top i {
    font-size: 18px;
  }
}