Build an AI fitness workout planner web app. Let users set goals, experience level, available equipment, workout days, session length, and limitations; generate a weekly plan; view each workout with exercises, sets, reps, rest, and form notes; check off completed sessions; log weights and reps; see progress charts; swap exercises; and ask an AI coach to adapt the next week. Include onboarding, calendar, workout detail, progress dashboard, and settings screens. Use an energetic but calm visual system with dark navy, electric lime, and generous cards.