.product-follow-navigation { position: fixed; width: 256px; z-index: 20; opacity: 0; visibility: hidden; pointer-events: none; transition: opacity 200ms ease, visibility 200ms; }
.product-follow-navigation.is-visible { opacity: 1; visibility: visible; pointer-events: auto; }
@media (prefers-reduced-motion: reduce) { .product-follow-navigation { transition: none; } }
/* Compact fallback for the product rail; position follows the existing TOP button. */
.product-navigation-toggle { position:fixed; z-index:9002; min-height:48px; max-width:calc(100vw - 90px); padding:10px 16px; border:1px solid var(--color-border-default); border-radius:24px; background:var(--color-brand-green-dark); color:#fff; font:700 14px/1.4 var(--font-body, sans-serif); box-shadow:0 4px 16px #003d2926; cursor:pointer; }
.product-navigation-toggle[hidden] { display:none; }
.product-navigation-toggle:focus-visible { outline:3px solid var(--color-brand-green-darker); outline-offset:3px; }
.product-follow-navigation.is-compact { z-index:9001; width:min(340px,calc(100vw - 24px)); overflow-y:auto; overscroll-behavior:contain; box-shadow:0 8px 32px #003d2933; border-radius:12px; }
.product-follow-navigation.is-compact .page-navigation__list a { min-height:48px; }