export interface Word {
  id: string;
  word: string;
  definition: string;
  example: string;
  category: string;
  difficulty: 'easy' | 'medium' | 'hard';
}

export interface WordAttempt {
  correct: number;
  incorrect: number;
  lastSeen: string;
}

export interface UserProgress {
  masteredWords: string[];
  attempts: Record<string, WordAttempt>;
  totalStars: number;
  lastPlayed: string;
}