/* Up / Down — extreme right, vertically centered */
.page-nav-v {
  position: fixed;
  top: 50%;
  right: 16px;
  transform: translateY(-50%);
  z-index: 1002;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.page-nav-v__btn {
  appearance: none;
  background: transparent;
  border: 0;
  padding: 0.35rem;
  margin: 0;
  cursor: pointer;
  font-family: inherit;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #000;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  line-height: 1;
  transition: opacity 0.3s ease, color 0.3s ease;
}

.page-nav-v__btn svg {
  display: block;
  width: 14px;
  height: 14px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.75;
  stroke-linecap: square;
  stroke-linejoin: miter;
}

.page-nav-v__btn span {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  letter-spacing: 0.75px;
  font-weight: 500;
}

.page-nav-v__btn:hover {
  opacity: 0.55;
}

.page-nav-v__btn:focus-visible {
  outline: 2px solid #151515;
  outline-offset: 4px;
}

.page-nav-v__btn.is-disabled {
  opacity: 0.25;
  pointer-events: none;
}

.dark-scheme .page-nav-v__btn,
.page-nav-v.dark .page-nav-v__btn {
  color: #fff;
}

@media (max-width: 767px) {
  .page-nav-v {
    display: none;
  }
}