.ls-scroll-top {
  position: fixed;
  right: 1.25rem; /* запасной вариант до расчёта по контейнеру */
  bottom: 2rem;
  z-index: 9998;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: var(--color-navy, #003b6f);
  color: #fff;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(0, 59, 111, 0.22);
  opacity: 0;
  visibility: hidden;
  transform: translateY(0.75rem);
  transition:
    opacity 0.25s ease,
    transform 0.25s ease,
    visibility 0.25s ease,
    background-color 0.15s ease;
}

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

.ls-scroll-top:hover {
  background: var(--color-navy-deep, #002a4f);
}

.ls-scroll-top:focus-visible {
  outline: 2px solid var(--color-orange, #ff8c2a);
  outline-offset: 2px;
}

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

@media (max-width: 767px) {
  .ls-scroll-top {
    bottom: 1.25rem;
    width: 2.75rem;
    height: 2.75rem;
  }
}