/* Subtle desktop section rail (right edge) */
.section-rail {
  position: fixed;
  top: 50%;
  right: max(12px, calc((100vw - var(--max, 1180px)) / 2 - 28px));
  transform: translateY(-50%);
  z-index: 40;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s ease, visibility 0.35s ease;
}

.section-rail.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.section-rail-list {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
  padding: 10px 6px;
}

.section-rail-item {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  appearance: none;
  border: 0;
  background: transparent;
  color: rgba(186, 214, 255, 0.72);
  cursor: pointer;
  padding: 2px 0;
  pointer-events: auto;
}

.section-rail-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  border: 1px solid rgba(143, 180, 230, 0.35);
  background: rgba(8, 16, 30, 0.55);
  box-shadow: 0 0 0 1px rgba(5, 10, 20, 0.35);
  transition: transform 0.28s ease, background 0.28s ease, border-color 0.28s ease, box-shadow 0.28s ease;
}

.section-rail-label {
  position: absolute;
  right: 18px;
  white-space: nowrap;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: rgba(210, 228, 255, 0.78);
  background: rgba(7, 12, 22, 0.72);
  border: 1px solid rgba(140, 180, 255, 0.12);
  border-radius: 999px;
  padding: 4px 9px;
  opacity: 0;
  transform: translateX(6px);
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.section-rail-item:hover .section-rail-label,
.section-rail-item:focus-visible .section-rail-label,
.section-rail-item.is-active .section-rail-label {
  opacity: 1;
  transform: translateX(0);
}

.section-rail-item:hover .section-rail-dot,
.section-rail-item:focus-visible .section-rail-dot {
  border-color: rgba(143, 211, 255, 0.7);
  background: rgba(143, 211, 255, 0.35);
  transform: scale(1.15);
  outline: none;
}

.section-rail-item.is-active .section-rail-dot {
  border-color: rgba(143, 211, 255, 0.85);
  background: #8fd3ff;
  box-shadow: 0 0 0 3px rgba(143, 211, 255, 0.14);
  transform: scale(1.2);
}

.section-rail-item:focus-visible {
  outline: none;
}

@media (max-width: 1100px) {
  .section-rail {
    display: none !important;
  }
}

@media (prefers-reduced-motion: reduce) {
  .section-rail,
  .section-rail-dot,
  .section-rail-label {
    transition: none;
  }
}