united-tattoo/docs/stories/pub-2-parallax-split-hero.md

UT-PUB-02 — Parallax and Split-Screen Hero Sections

Status

Ready for Dev

Story

As a visitor,
I want smooth, layered parallax and split‑screen hero sections on key pages,
so that the site feels immersive and visually engaging without sacrificing performance or accessibility.

Acceptance Criteria

1. Given I’m on the homepage or an artist page
   When I scroll
   Then layered visuals and split sections animate smoothly within performance budgets (no noticeable jank; respects prefers‑reduced‑motion)

Tasks / Subtasks

• Define UX and constraints (AC: 1)
  • Specify max parallax depth, layers, and scroll ranges (mobile/desktop)
  • Document fallback behavior for prefers-reduced-motion: reduce (animations disabled or simplified)
  • Establish performance budgets: LCP target, avoid layout shift, minimal main thread cost
• Implement homepage hero enhancements (AC: 1)
  • Update/extend components/hero-section.tsx for layered composition (foreground text, midground overlays, background image)
  • Use CSS transforms and opacity for motion; avoid heavy JS; throttle with requestAnimationFrame
  • Guard with use client only where needed; ensure SSR compatibility for static layers
• Implement artist page split‑screen/hero (AC: 1)
  • Add or update hero for artist pages (e.g., components/artists-page-section.tsx / components/artist-portfolio.tsx) to support split‑screen layout (image/story)
  • Ensure composition adapts at breakpoints (stack on mobile, split at md+)
• Motion system & accessibility (AC: 1)
  • Respect prefers-reduced-motion; expose CSS class or data attribute to disable animations
  • Use tailwindcss-animate classes for subtle transitions; avoid inline animation CSS
  • Ensure focus order and headings are unaffected by decorative layers (decorative images aria-hidden)
• Smooth scrolling integration (AC: 1)
  • If Lenis is enabled, verify no conflict with parallax updates (no double scroll handlers)
  • Disable or degrade parallax effect when smooth scroll is off or reduced motion is on
• Performance validation (AC: 1)
  • Audit LCP/INP locally; ensure no long tasks > 50ms introduced by parallax logic
  • Validate no layout shift (CLS) from parallax layers; use fixed heights/aspect‑ratio placeholders
• Tests and checks (AC: 1)
  • RTL tests validate presence of hero layers and reduced‑motion fallback class toggles
  • Add visual acceptance notes and manual test plan for scroll behavior across sm/md/lg

Dev Notes

Pulled from project artifacts (do not invent):

• docs/PRD.md (Epic C — Public Website)
  • UT‑PUB‑02: Smooth, performant parallax/split‑screen hero on homepage and artist pages
  • Visual emphasis with high‑quality photography; mobile‑first responsiveness (C1–C3)
• docs/ui-architecture.md
  • Use Tailwind v4 utilities; ShadCN/Radix for a11y components; use tailwindcss-animate and Lenis; avoid heavy JS animation libs
  • Accessibility baseline WCAG AA; focus visible; avoid keyboard traps; keep components presentational with side‑effects in hooks
  • Performance: prefer server components; client JS only when necessary; lazy‑load heavy modules
• Existing Source Tree (verify before edits)
  • components/hero-section.tsx (homepage hero)
  • components/artists-page-section.tsx, components/artist-portfolio.tsx (artist views)
  • components/section-header.tsx, components/smooth-scroll-provider.tsx (potential integration points)

Testing (from docs/ui-architecture.md: Testing Requirements/Best Practices)

• Unit/Component: Vitest + RTL; deterministic; verify reduced‑motion behavior and layer presence
• E2E (later): confirm smooth scroll and no jank on critical scroll ranges in preview env
• Targets: No CLS from hero; initial render stable with defined heights/placeholders

Change Log

Date	Version	Description	Author
2025-09-19	0.2	PO validation: Ready for Dev	Product Owner
2025-09-19	0.1	Initial draft of PUB‑02 story	Scrum Master

Dev Agent Record

Agent Model Used

Debug Log References

Completion Notes List

File List

QA Results