GSAP Motion

Use this skill to add motion that clarifies state, hierarchy, navigation, storytelling, or direct manipulation in modern web interfaces.

Prefer the simplest durable tool:

• Use CSS transitions or keyframes for simple hover, focus, opacity, transform, and one-off state changes.
• Use GSAP Core for precise sequencing, interruption control, complex transforms, and animation that must be coordinated across elements.
• Use timelines when multiple animations need shared timing, labels, pause/resume, or reversal.
• Use ScrollTrigger for scroll-linked reveals, pinned sections, progress, and scroll storytelling.
• Use Flip for layout reordering, drag/drop transitions, masonry changes, filters, and route-level layout continuity.
• Use SplitText only when text animation is central to the experience and accessibility/fallbacks are handled.

Operating Rules

• Motion must serve a product purpose: orientation, feedback, emphasis, continuity, or delight.
• Keep motion mobile-first and fast. Default to shorter durations, clear easing, and fewer moving parts on small screens.
• Respect prefers-reduced-motion; provide meaningful reduced or disabled motion paths.
• Animate transform and opacity whenever possible. Avoid animating layout-heavy properties in high-frequency motion.
• In React, scope animations to component lifecycles and clean up all GSAP instances, triggers, media queries, and observers.
• In Next.js, keep GSAP code on the client side and avoid server-side access to window, document, or DOM refs.
• Avoid decorative motion that competes with reading, decision-making, forms, navigation, or primary content.

Routing

Read only what is relevant to the current task:

• For choosing CSS vs GSAP and selecting a pattern, read references/decision-guide.md.
• For GSAP basics, tweens, eases, utilities, cleanup, and defaults, read references/gsap-core.md.
• For sequencing, labels, shared control, and reversible UI motion, read references/timelines.md.
• For scroll reveals, pinned sections, scrubbed scenes, and responsive scroll behavior, read references/scrolltrigger.md.
• For React component integration, refs, useGSAP, context, and cleanup, read references/react.md.
• For Next.js App Router, client components, dynamic import, SSR boundaries, and route transitions, read references/nextjs.md.
• For accessibility, reduced motion, focus, vestibular safety, and text animation caveats, read references/accessibility.md.
• For rendering performance, layout thrash, GPU compositing, and testing, read references/performance.md.
• For breakpoints, input modes, resize behavior, and mobile-first defaults, read references/responsive-motion.md.
• For motion strategy, hierarchy, personality, and microinteractions, read references/motion-design.md.
• For common mistakes and when not to animate, read references/anti-patterns.md.

Use examples only as adaptation references, not as fixed templates:

• examples/hero.tsx for staged hero entrances.
• examples/section-reveal.tsx for progressive section reveals.
• examples/stagger-cards.tsx for card grids and ranking lists.
• examples/scroll-storytelling.tsx for ScrollTrigger scenes.
• examples/flip-layout.tsx for layout reorder/filter transitions.
• examples/reduced-motion.tsx for reduced-motion handling.

Delivery Checklist

Before finishing a frontend motion task:

• Confirm motion still works when content length changes.
• Confirm cleanup prevents duplicated animations after remounts or route changes.
• Confirm keyboard and screen-reader flows remain usable.
• Confirm reduced-motion behavior is present.
• Confirm mobile and desktop timing, spacing, and trigger points feel appropriate.
• Confirm no important text or controls are obscured during animation.