{
  "levels": [
    {
      "id": "beginner",
      "name": "Beginner",
      "description": "Basic vocabulary and pronunciation for beginners",
      "color": "#22c55e"
    },
    {
      "id": "elementary",
      "name": "Elementary", 
      "description": "Elementary level vocabulary building",
      "color": "#3b82f6"
    },
    {
      "id": "pre-intermediate",
      "name": "Pre-Intermediate",
      "description": "Pre-intermediate vocabulary and expressions",
      "color": "#f59e0b"
    },
    {
      "id": "upper-intermediate", 
      "name": "Upper-Intermediate",
      "description": "Upper-intermediate complex vocabulary",
      "color": "#f97316"
    },
    {
      "id": "advanced",
      "name": "Advanced",
      "description": "Advanced vocabulary and pronunciation patterns",
      "color": "#ef4444"
    }
  ],
  "lessons": {
    "beginner": [
      {
        "id": "beginner_1",
        "title": "Basic Greetings",
        "description": "Learn how to greet people in English",
        "level": "beginner",
        "vocabulary": [
          {
            "word": "hello",
            "ipa": "/həˈloʊ/",
            "vietnamese": "xin chào",
            "audioUrl": "/api/tts/hello"
          },
          {
            "word": "goodbye", 
            "ipa": "/ɡʊdˈbaɪ/",
            "vietnamese": "tạm biệt",
            "audioUrl": "/api/tts/goodbye"
          },
          {
            "word": "thank",
            "ipa": "/θæŋk/",
            "vietnamese": "cảm ơn",
            "audioUrl": "/api/tts/thank"
          },
          {
            "word": "please",
            "ipa": "/pliːz/",
            "vietnamese": "xin lỗi/làm ơn",
            "audioUrl": "/api/tts/please"
          },
          {
            "word": "sorry",
            "ipa": "/ˈsɔːri/",
            "vietnamese": "xin lỗi",
            "audioUrl": "/api/tts/sorry"
          },
          {
            "word": "excuse",
            "ipa": "/ɪkˈskjuːz/",
            "vietnamese": "xin lỗi/thứ lỗi",
            "audioUrl": "/api/tts/excuse"
          },
          {
            "word": "morning",
            "ipa": "/ˈmɔːrnɪŋ/",
            "vietnamese": "buổi sáng",
            "audioUrl": "/api/tts/morning"
          },
          {
            "word": "evening",
            "ipa": "/ˈiːvnɪŋ/",
            "vietnamese": "buổi tối",
            "audioUrl": "/api/tts/evening"
          },
          {
            "word": "night",
            "ipa": "/naɪt/",
            "vietnamese": "đêm",
            "audioUrl": "/api/tts/night"
          },
          {
            "word": "welcome",
            "ipa": "/ˈwelkəm/",
            "vietnamese": "chào mừng",
            "audioUrl": "/api/tts/welcome"
          }
        ],
        "sentence": {
          "text": "Hello, good morning! Thank you very much.",
          "ipa": "/həˈloʊ ɡʊd ˈmɔːrnɪŋ θæŋk juː ˈveri mʌtʃ/",
          "vietnamese": "Xin chào, chào buổi sáng! Cảm ơn rất nhiều.",
          "audioUrl": "/api/tts/hello-good-morning-thank-you-very-much"
        }
      },
      {
        "id": "beginner_2", 
        "title": "Family Members",
        "description": "Learn family vocabulary and pronunciation",
        "level": "beginner",
        "vocabulary": [
          {
            "word": "family",
            "ipa": "/ˈfæməli/",
            "vietnamese": "gia đình",
            "audioUrl": "/api/tts/family"
          },
          {
            "word": "mother",
            "ipa": "/ˈmʌðər/", 
            "vietnamese": "mẹ",
            "audioUrl": "/api/tts/mother"
          },
          {
            "word": "father",
            "ipa": "/ˈfɑːðər/",
            "vietnamese": "bố",
            "audioUrl": "/api/tts/father"
          },
          {
            "word": "sister",
            "ipa": "/ˈsɪstər/",
            "vietnamese": "chị/em gái",
            "audioUrl": "/api/tts/sister"
          },
          {
            "word": "brother",
            "ipa": "/ˈbrʌðər/",
            "vietnamese": "anh/em trai",
            "audioUrl": "/api/tts/brother"
          },
          {
            "word": "child",
            "ipa": "/tʃaɪld/",
            "vietnamese": "đứa trẻ",
            "audioUrl": "/api/tts/child"
          },
          {
            "word": "parent",
            "ipa": "/ˈperənt/",
            "vietnamese": "cha mẹ",
            "audioUrl": "/api/tts/parent"
          },
          {
            "word": "baby",
            "ipa": "/ˈbeɪbi/",
            "vietnamese": "em bé",
            "audioUrl": "/api/tts/baby"
          },
          {
            "word": "wife",
            "ipa": "/waɪf/",
            "vietnamese": "vợ",
            "audioUrl": "/api/tts/wife"
          },
          {
            "word": "husband",
            "ipa": "/ˈhʌzbənd/",
            "vietnamese": "chồng",
            "audioUrl": "/api/tts/husband"
          }
        ],
        "sentence": {
          "text": "My family has a mother, father, sister and brother.",
          "ipa": "/maɪ ˈfæməli hæz ə ˈmʌðər ˈfɑːðər ˈsɪstər ænd ˈbrʌðər/",
          "vietnamese": "Gia đình tôi có mẹ, bố, chị gái và anh trai.",
          "audioUrl": "/api/tts/my-family-has-a-mother-father-sister-and-brother"
        }
      }
    ],
    "elementary": [
      {
        "id": "elementary_1",
        "title": "Daily Activities",
        "description": "Learn vocabulary for daily activities",
        "level": "elementary",
        "vocabulary": [
          {
            "word": "breakfast",
            "ipa": "/ˈbrekfəst/",
            "vietnamese": "bữa sáng",
            "audioUrl": "/api/tts/breakfast"
          },
          {
            "word": "lunch",
            "ipa": "/lʌntʃ/",
            "vietnamese": "bữa trưa",
            "audioUrl": "/api/tts/lunch"
          },
          {
            "word": "dinner",
            "ipa": "/ˈdɪnər/",
            "vietnamese": "bữa tối",
            "audioUrl": "/api/tts/dinner"
          },
          {
            "word": "school",
            "ipa": "/skuːl/",
            "vietnamese": "trường học",
            "audioUrl": "/api/tts/school"
          },
          {
            "word": "work",
            "ipa": "/wɜːrk/",
            "vietnamese": "làm việc",
            "audioUrl": "/api/tts/work"
          },
          {
            "word": "exercise",
            "ipa": "/ˈeksərsaɪz/",
            "vietnamese": "tập thể dục",
            "audioUrl": "/api/tts/exercise"
          },
          {
            "word": "sleep",
            "ipa": "/sliːp/",
            "vietnamese": "ngủ",
            "audioUrl": "/api/tts/sleep"
          },
          {
            "word": "study",
            "ipa": "/ˈstʌdi/",
            "vietnamese": "học tập",
            "audioUrl": "/api/tts/study"
          },
          {
            "word": "homework",
            "ipa": "/ˈhoʊmwɜːrk/",
            "vietnamese": "bài tập về nhà",
            "audioUrl": "/api/tts/homework"
          },
          {
            "word": "television",
            "ipa": "/ˈtelɪvɪʒn/",
            "vietnamese": "ti vi",
            "audioUrl": "/api/tts/television"
          }
        ],
        "sentence": {
          "text": "I eat breakfast, go to school, and do my homework every day.",
          "ipa": "/aɪ iːt ˈbrekfəst ɡoʊ tuː skuːl ænd duː maɪ ˈhoʊmwɜːrk ˈevri deɪ/",
          "vietnamese": "Tôi ăn sáng, đi học và làm bài tập về nhà mỗi ngày.",
          "audioUrl": "/api/tts/i-eat-breakfast-go-to-school-and-do-my-homework-every-day"
        }
      }
    ],
    "pre-intermediate": [
      {
        "id": "pre_intermediate_1",
        "title": "Travel & Transportation",
        "description": "Learn travel-related vocabulary",
        "level": "pre-intermediate",
        "vocabulary": [
          {
            "word": "airport",
            "ipa": "/ˈerˌpɔːrt/",
            "vietnamese": "sân bay",
            "audioUrl": "/api/tts/airport"
          },
          {
            "word": "passport",
            "ipa": "/ˈpæspɔːrt/",
            "vietnamese": "hộ chiếu",
            "audioUrl": "/api/tts/passport"
          },
          {
            "word": "luggage",
            "ipa": "/ˈlʌɡɪdʒ/",
            "vietnamese": "hành lý",
            "audioUrl": "/api/tts/luggage"
          },
          {
            "word": "ticket",
            "ipa": "/ˈtɪkɪt/",
            "vietnamese": "vé",
            "audioUrl": "/api/tts/ticket"
          },
          {
            "word": "destination",
            "ipa": "/ˌdestɪˈneɪʃn/",
            "vietnamese": "điểm đến",
            "audioUrl": "/api/tts/destination"
          },
          {
            "word": "journey",
            "ipa": "/ˈdʒɜːrni/",
            "vietnamese": "hành trình",
            "audioUrl": "/api/tts/journey"
          },
          {
            "word": "adventure",
            "ipa": "/ədˈventʃər/",
            "vietnamese": "phiêu lưu",
            "audioUrl": "/api/tts/adventure"
          },
          {
            "word": "reservation",
            "ipa": "/ˌrezərˈveɪʃn/",
            "vietnamese": "đặt chỗ",
            "audioUrl": "/api/tts/reservation"
          },
          {
            "word": "accommodation",
            "ipa": "/əˌkɑːməˈdeɪʃn/",
            "vietnamese": "chỗ ở",
            "audioUrl": "/api/tts/accommodation"
          },
          {
            "word": "schedule",
            "ipa": "/ˈskedʒuːl/",
            "vietnamese": "lịch trình",
            "audioUrl": "/api/tts/schedule"
          }
        ],
        "sentence": {
          "text": "I need to check my passport and luggage before the journey to my destination.",
          "ipa": "/aɪ niːd tuː tʃek maɪ ˈpæspɔːrt ænd ˈlʌɡɪdʒ bɪˈfɔːr ðə ˈdʒɜːrni tuː maɪ ˌdestɪˈneɪʃn/",
          "vietnamese": "Tôi cần kiểm tra hộ chiếu và hành lý trước chuyến đi đến điểm đến của mình.",
          "audioUrl": "/api/tts/i-need-to-check-my-passport-and-luggage-before-the-journey-to-my-destination"
        }
      }
    ],
    "upper-intermediate": [
      {
        "id": "upper_intermediate_1",
        "title": "Business & Professional",
        "description": "Learn business and professional vocabulary",
        "level": "upper-intermediate",
        "vocabulary": [
          {
            "word": "presentation",
            "ipa": "/ˌpriːzenˈteɪʃn/",
            "vietnamese": "bài thuyết trình",
            "audioUrl": "/api/tts/presentation"
          },
          {
            "word": "negotiation",
            "ipa": "/nɪˌɡoʊʃiˈeɪʃn/",
            "vietnamese": "đàm phán",
            "audioUrl": "/api/tts/negotiation"
          },
          {
            "word": "collaboration",
            "ipa": "/kəˌlæbəˈreɪʃn/",
            "vietnamese": "hợp tác",
            "audioUrl": "/api/tts/collaboration"
          },
          {
            "word": "achievement",
            "ipa": "/əˈtʃiːvmənt/",
            "vietnamese": "thành tựu",
            "audioUrl": "/api/tts/achievement"
          },
          {
            "word": "responsibility",
            "ipa": "/rɪˌspɑːnsəˈbɪləti/",
            "vietnamese": "trách nhiệm",
            "audioUrl": "/api/tts/responsibility"
          },
          {
            "word": "opportunity",
            "ipa": "/ˌɑːpərˈtuːnəti/",
            "vietnamese": "cơ hội",
            "audioUrl": "/api/tts/opportunity"
          },
          {
            "word": "efficiency",
            "ipa": "/ɪˈfɪʃnsi/",
            "vietnamese": "hiệu quả",
            "audioUrl": "/api/tts/efficiency"
          },
          {
            "word": "innovation",
            "ipa": "/ˌɪnəˈveɪʃn/",
            "vietnamese": "đổi mới",
            "audioUrl": "/api/tts/innovation"
          },
          {
            "word": "development",
            "ipa": "/dɪˈveləpmənt/",
            "vietnamese": "phát triển",
            "audioUrl": "/api/tts/development"
          },
          {
            "word": "implementation",
            "ipa": "/ˌɪmplɪmenˈteɪʃn/",
            "vietnamese": "thực hiện",
            "audioUrl": "/api/tts/implementation"
          }
        ],
        "sentence": {
          "text": "Successful collaboration and innovation lead to efficient implementation of business development strategies.",
          "ipa": "/səkˈsesfl kəˌlæbəˈreɪʃn ænd ˌɪnəˈveɪʃn liːd tuː ɪˈfɪʃnt ˌɪmplɪmenˈteɪʃn ʌv ˈbɪznəs dɪˈveləpmənt ˈstrætədʒiz/",
          "vietnamese": "Hợp tác thành công và đổi mới dẫn đến việc thực hiện hiệu quả các chiến lược phát triển kinh doanh.",
          "audioUrl": "/api/tts/successful-collaboration-and-innovation-lead-to-efficient-implementation-of-business-development-strategies"
        }
      }
    ],
    "advanced": [
      {
        "id": "advanced_1",
        "title": "Academic & Scientific",
        "description": "Learn advanced academic and scientific vocabulary",
        "level": "advanced",
        "vocabulary": [
          {
            "word": "hypothesis",
            "ipa": "/haɪˈpɑːθəsɪs/",
            "vietnamese": "giả thuyết",
            "audioUrl": "/api/tts/hypothesis"
          },
          {
            "word": "methodology",
            "ipa": "/ˌmeθəˈdɑːlədʒi/",
            "vietnamese": "phương pháp luận",
            "audioUrl": "/api/tts/methodology"
          },
          {
            "word": "phenomenon",
            "ipa": "/fəˈnɑːmɪnən/",
            "vietnamese": "hiện tượng",
            "audioUrl": "/api/tts/phenomenon"
          },
          {
            "word": "theoretical",
            "ipa": "/ˌθiːəˈretɪkl/",
            "vietnamese": "lý thuyết",
            "audioUrl": "/api/tts/theoretical"
          },
          {
            "word": "empirical",
            "ipa": "/ɪmˈpɪrɪkl/",
            "vietnamese": "thực nghiệm",
            "audioUrl": "/api/tts/empirical"
          },
          {
            "word": "comprehensive",
            "ipa": "/ˌkɑːmprɪˈhensɪv/",
            "vietnamese": "toàn diện",
            "audioUrl": "/api/tts/comprehensive"
          },
          {
            "word": "sophisticated",
            "ipa": "/səˈfɪstɪkeɪtɪd/",
            "vietnamese": "tinh vi",
            "audioUrl": "/api/tts/sophisticated"
          },
          {
            "word": "prerequisite",
            "ipa": "/priːˈrekwəzɪt/",
            "vietnamese": "điều kiện tiên quyết",
            "audioUrl": "/api/tts/prerequisite"
          },
          {
            "word": "substantiate",
            "ipa": "/səbˈstænʃieɪt/",
            "vietnamese": "chứng minh",
            "audioUrl": "/api/tts/substantiate"
          },
          {
            "word": "paradigm",
            "ipa": "/ˈpærədaɪm/",
            "vietnamese": "mô hình",
            "audioUrl": "/api/tts/paradigm"
          }
        ],
        "sentence": {
          "text": "The comprehensive methodology requires sophisticated theoretical frameworks to substantiate empirical hypotheses about complex phenomena.",
          "ipa": "/ðə ˌkɑːmprɪˈhensɪv ˌmeθəˈdɑːlədʒi rɪˈkwaɪərz səˈfɪstɪkeɪtɪd ˌθiːəˈretɪkl ˈfreɪmwɜːrks tuː səbˈstænʃieɪt ɪmˈpɪrɪkl haɪˈpɑːθəsiz əˈbaʊt kəmˈpleks fəˈnɑːmɪnə/",
          "vietnamese": "Phương pháp luận toàn diện đòi hỏi các khung lý thuyết tinh vi để chứng minh các giả thuyết thực nghiệm về các hiện tượng phức tạp.",
          "audioUrl": "/api/tts/the-comprehensive-methodology-requires-sophisticated-theoretical-frameworks-to-substantiate-empirical-hypotheses-about-complex-phenomena"
        }
      }
    ]
  }
}