Clinical Research Directory

Inclusion Criteria: -Age ≥ 60 years, regardless of gender. Willing and able to provide signed informed consent. Exclusion Criteria: * Corrected visual acuity insufficient to see text/images on a mobile phone screen. * Corrected hearing inability to hear prompts at the phone's maximum volume. Severe upper limb dysfunction (e.g., severe arthritis, Parkinson's tremor) preventing stable phone operation. * Does not own a smartphone, or owns one that cannot properly run WeChat mini-programs. * History of severe mental illness (e.g., major depressive disorder, bipolar disorder, schizophrenia). * History of long-term alcohol or substance abuse. * Hospitalization, emergency visit, or major life event (e.g., myocardial infarction, marriage/divorce, fall) within the past month. * Use of antipsychotics, antidepressants, antiepileptics, sedatives, or plans to use them within the next two weeks. * Planned travel (e.g., inter-city) or other major arrangements likely to interrupt study participation within the next two weeks.