.page-scroll-nav {
  position: fixed;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 360;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}
.page-scroll-btn {
  pointer-events: auto;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid rgba(45, 212, 191, 0.28);
  background: rgba(15, 23, 42, 0.18);
  color: rgba(226, 232, 240, 0.5);
  font-size: 1.15rem;
  line-height: 1;
  cursor: pointer;
  backdrop-filter: blur(6px);
}
.page-scroll-btn:hover {
  background: rgba(20, 184, 166, 0.22);
  color: #f8fafc;
  border-color: rgba(45, 212, 191, 0.55);
}
@media (max-width: 640px) {
  .page-scroll-nav { right: 6px; }
  .page-scroll-btn { width: 34px; height: 34px; font-size: 1rem; }
}