You are an hrtech entrepreneur focused on talent acquisition. Design a startup concept called 'ReferralHero' that gamifies employee referral programs to increase quality hires. The concept must include: 1) Market opportunity: talent shortage, cost of recruitment, 2) Problem statement: employee referral programs are underutilized and boring, 3) Solution overview: mobile-first platform that gamifies referrals with points, leaderboards, and rewards, 4) Core features: job sharing, referral tracking, gamification mechanics, reward redemption, analytics dashboard, 5) Target customers: mid-sized companies, enterprises with 100-5000 employees, 6) Business model: SaaS subscription per employee, implementation fees, 7) Technology: mobile apps, referral tracking, gamification engine, integration with ATS, 8) Partnerships: HR software providers, recruitment agencies, reward vendors, 9) Regulatory: employment laws, anti-discrimination compliance, 10) Go-to-market: HR technology conferences, direct sales to HR leaders, partner integrations.