/* Botón "Subir arriba" / "TOP" — abajo a la derecha, estilo circular con flecha y texto */

.back-to-top {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 1000;
  width: 3.25rem;
  height: 3.25rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.1rem;
  background: #1a1a1a;
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  text-decoration: none;
  font-family: inherit;
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.back-to-top:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
}

.back-to-top:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 3px;
}

.back-to-top svg {
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
}

.back-to-top span {
  line-height: 1;
}