/m-scroll-fx — Scroll Effects

Reveal: elements fade in + translate up 20-30px on viewport entry.\n- threshold: 0.1\n- Stagger siblings 80-120ms\n- One-shot (don't re-hide)\n\nParallax: background layers at different scroll rates.\n- Use CSS scroll-driven animations where supported\n- Keep subtle (0.1-0.3 rate difference)\n\nRespect prefers-reduced-motion.