veza/apps/web/src/components/layout/PageTransition.tsx

import { motion } from 'framer-motion';
import { useLocation } from 'react-router-dom';
import { ReactNode, useMemo } from 'react';

interface PageTransitionProps {
  children: ReactNode;
}

/**
 * S5.3: Subtile page transitions (Linear-style fade + slide-up)
 * Respects prefers-reduced-motion for accessibility.
 */
export function PageTransition({ children }: PageTransitionProps) {
  const location = useLocation();

  const prefersReducedMotion = useMemo(
    () =>
      typeof window !== 'undefined' &&
      window.matchMedia('(prefers-reduced-motion: reduce)').matches,
    [],
  );

  if (prefersReducedMotion) {
    return <div key={location.pathname}>{children}</div>;
  }

  return (
    <motion.div
      key={location.pathname}
      initial={{ opacity: 0, y: 8 }}
      animate={{ opacity: 1, y: 0 }}
      exit={{ opacity: 0, y: -8 }}
      transition={{
        duration: 0.2,
        ease: [0.25, 0.1, 0.25, 1],
      }}
    >
      {children}
    </motion.div>
  );
}