Heart Voice: Starry Journey - A Digital ACT Intervention for ASD Caregivers

The goal of this clinical trial is to evaluate the effectiveness of the "Heart Voice: Starry Journey" program, a family-centric and Acceptance and Commitment Therapy (ACT)-based digital narrative intervention, in improving psychological flexibility and mental health among primary caregivers of children with Autism Spectrum Disorder (ASD). The main questions it aims to answer are:

1. Does the "Heart Voice: Starry Journey" intervention lead to a greater improvement in psychological flexibility among caregivers of children with ASD, compared to a control group? 2. Does the "Heart Voice: Starry Journey" intervention lead to a greater reduction in symptoms of anxiety and depression among caregivers of children with ASD, compared to a control group? Researchers will compare the intervention group (using the "Heart Voice: Starry Journey" program) with a wait-list control group (receiving usual care and access to the intervention after the trial) to see if the digital intervention is more effective.

Participants in the intervention group will:

* Use the "Heart Voice: Starry Journey" mobile application over a 6-week period, engaging with interactive stories and ACT-based exercises. * Complete a series of online questionnaires about their psychological flexibility, anxiety, depression, and caregiver burden at the beginning of the study, immediately after the 6-week intervention, and at a follow-up time point (1 months later).

Participants in the wait-list control group will:

* Continue with their usual care routines during the study period. * Complete the same series of online questionnaires at the same time points as the intervention group.