XP System: Each review grants XP based on its length:
- Any review: 50 XP minimum
- Over 50 words: 100 XP
- Over 100 words: 150 XP
- Over 150 words: 200 XP
- Over 200 words: 250 XP
- Over 250 words: 300 XP
- Over 300 words: 350 XP
- Over 350 words: 400 XP
- Over 400 words: 450 XP
- Over 450 words: 500 XP (max)
Every 100 XP = 1 level. Level badge color changes at certain breakpoints.
