Design a mobile app for a medical appointment and record management system targeting a diabetes care center. The app should include interfaces for three types of users: patients, doctors, and administrators.

Key screens to include:

Patient interface:

Login/Register

Dashboard with upcoming appointments and notifications

Book appointment (choose doctor, date, time)

View and manage existing appointments

Access medical records (diagnoses, prescriptions, lab results)

Receive reminders and alerts

Doctor interface:

Login

View daily/weekly appointment schedule

Access and update patient medical records

Write prescriptions, request lab tests

Administrator interface:

Login

Manage users (patients, doctors)

View hospital stats (appointment stats, doctor availability)

Assign access rights

The design should be clean, user-friendly, and optimized for mobile. Use clear navigation and appropriate icons for healthcare. Prioritize accessibility and simplicity.