.sertonix-scroll-top {
  position: fixed;
  left: 20px;
  bottom: 20px;
  z-index: 10040;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid rgba(16, 95, 171, 0.2);
  border-radius: 50%;
  background: #fff;
  color: #105fab;
  box-shadow: 0 4px 16px rgba(12, 88, 163, 0.18);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition:
    opacity 0.25s ease,
    visibility 0.25s ease,
    transform 0.25s ease,
    background-color 0.2s ease,
    border-color 0.2s ease,
    box-shadow 0.2s ease;
}

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

.sertonix-scroll-top:hover {
  background: #105fab;
  border-color: #105fab;
  color: #fff;
  box-shadow: 0 6px 20px rgba(12, 88, 163, 0.28);
}

.sertonix-scroll-top:focus-visible {
  outline: 2px solid #129fe1;
  outline-offset: 2px;
}

.sertonix-scroll-top svg {
  display: block;
  width: 18px;
  height: 18px;
}

@media (max-width: 767px) {
  .sertonix-scroll-top {
    left: 16px;
    bottom: 16px;
    width: 40px;
    height: 40px;
  }
}

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