.section-navigation-shell{position:sticky;top:max(8px,env(safe-area-inset-top));z-index:30;padding:4px;border:1px solid rgb(var(--ff-border)/.45);border-radius:20px;background:rgb(var(--ff-surface)/.94);box-shadow:0 8px 28px rgb(var(--ff-fg)/.08),inset 0 1px 0 rgb(var(--ff-surface)/.8);isolation:isolate}@supports ((backdrop-filter:blur(16px)) or (-webkit-backdrop-filter:blur(16px))){.section-navigation-shell{background:radial-gradient(ellipse at 90% 0,rgb(209 190 228/.14),transparent 70%),linear-gradient(180deg,rgb(var(--ff-bg)/.94),rgb(var(--ff-bg)/.83) 45%,rgb(var(--ff-bg)/.42)),linear-gradient(135deg,rgb(var(--ff-surface)/.9),rgb(var(--ff-surface-2)/.82));background-clip:padding-box;backdrop-filter:blur(20px) saturate(1.2);-webkit-backdrop-filter:blur(20px) saturate(1.2)}}@media(prefers-reduced-transparency:reduce){.section-navigation-shell{background:rgb(var(--ff-surface));backdrop-filter:none;-webkit-backdrop-filter:none}}@media(forced-colors:active){.section-navigation-shell{border-color:ButtonText;background:Canvas;box-shadow:none;backdrop-filter:none;-webkit-backdrop-filter:none}}