Build — Scroll to Top Button

What Was Added

Scroll to Top

Fixed button — bottom-right corner, 24px from edges
Auto-show — hidden at top, fades in after scrolling 200px
Smooth scroll — window.scrollTo({top:0, behavior:'smooth'})
Throttled — uses requestAnimationFrame to avoid scroll jank
44px tap target — mobile-friendly, thumb-reachable
Hover state — inverts to accent background on hover
Accessible — aria-label="Scroll to top"

Files Changed

index.html — CSS (.scroll-top), HTML button, JS scroll listener

Review

Verified

Button hidden when scrollY < 200
Button visible when scrollY > 200
Smooth fade transition (opacity 0.3s)
Click scrolls to top smoothly
z-index 80 — below tab bar (90) and nav (100)
Dark theme matches: #1A1A1A bg, accent border
Works on all 5 tabs