隐私政策

1. Data We Collect

• Account Data: nickname (required), optional email, sign‑in records.
• Learning Data: learning loops, uploaded documents/text, questions & answers, quiz results, study reports.
• Voice & Audio Data: your recordings for pronunciation practice and the derived features needed for feedback (e.g., pitch/f0, intensity, duration, pauses).
• Device & Logs: browser/device info, IP (for security/abuse prevention), error logs, and performance metrics.
• Communications & Feedback: content you provide when contacting us (e.g., support requests, surveys).

2. How We Use Data

• To provide, maintain, and improve features (learning loops, AI question generation, quizzes, pronunciation practice, speech reports).
• To personalize your experience (difficulty/scene recommendations, question generation, feedback visualizations).
• For account and security purposes (authentication, risk control, troubleshooting, abuse prevention).
• To meet legal obligations and respond to rights requests (deletion, record retention).
• For analytics and model improvement using de‑identified and aggregated data.

3. Legal Bases (where applicable)

• Contract necessity: to deliver the Services you request.
• Consent: e.g., optional email notifications or experimental features.
• Legitimate interests: e.g., improving Services and ensuring security without overriding your rights and freedoms.

4. Cookies & Local Storage

We use cookies, localStorage, or similar technologies to store session tokens, language, and UI preferences to support sign‑in and a better experience. You can manage these in your browser settings, which may affect functionality.

5. Sharing & Processing

We do not sell your personal data. We may work with bound processors to deliver the Services and share data only to the extent necessary for them to perform their duties:

• Identity, database, and object storage providers (for secure account, question bank, document, and audio storage).
• Speech and NLP providers (for TTS/ASR/scoring and question generation capabilities).
• Logging and monitoring (for troubleshooting and performance monitoring only).

We require processors to follow confidentiality, security, and compliance obligations and to refrain from using your data for unrelated purposes.

6. Data Retention

We keep personal data for as long as necessary to fulfill the purposes in this Policy. When you request deletion or when retention is no longer required, we delete or anonymize data as mandated by applicable law, while retaining any records required for legal obligations or dispute resolution.

7. Security Measures

• Industry‑standard protections for data in transit and at rest with least‑privilege access control.
• Ongoing log auditing and risk assessments to mitigate unauthorized access, disclosure, alteration, or destruction.

8. International Transfers

Your data may be processed or stored outside your country/region. We apply appropriate safeguards required by applicable data‑protection laws (e.g., standard contractual clauses or equivalent mechanisms).

9. Children & Minors

The Services are not intended for children under 13. Minors should use the Services only with parental/guardian consent and supervision.

10. Your Rights & Requests

• Access & Rectification: view and update your account and learning data.
• Deletion: delete your account or specific content where permitted by law (irreversible).
• Withdraw Consent: withdraw consent‑based processing without affecting prior lawful processing.
• Complaints: lodge complaints with a competent supervisory authority.

To exercise these rights, use in‑app “Settings → Support”. We respond within statutory timeframes.

11. Changes to this Policy

We may update this Policy from time to time. Material changes will be communicated in‑product or via other reasonable means. Continued use after the effective date constitutes acceptance of the updated Policy.

12. Contact Us

If you have questions or requests regarding this Policy, contact us via in‑app support. If you cannot sign in, use the contact channel shown on the sign‑in page (e.g., WeChat).