Weekly Dynamics of Psychopathological and Symptom Networks During Mindfulness-Based Interventions for Emotional Distress

The goal of this clinical study is to learn how Mindfulness Intervention for Emotional Distress (MIED) helps people with emotional distress and how their symptoms and psychological patterns change over time. The main questions it aims to answer are: * How do the relationships between emotions, thoughts, and behaviors change week by week during mindfulness training? * Which psychological skills, such as distress tolerance or cognitive flexibility, improve first and lead to later emotional relief? Two groups will be compared - one that takes part in an online mindfulness intervention and one that waits to join - to see how the intervention changes emotional and psychological networks over time. Participants will: * Complete a 7-week online self-guided Mindfulness Intervention for Emotional Distress（iMIED） designed for people experiencing high emotional distress. * Fill out short weekly questionnaires about their emotions, thoughts, and behaviors before, during, and after the course (9 times in total). * Receive access to the mindfulness program after the study if they are in the wait-list group. This study includes about 500 adults aged 18 and older who feel anxious, depressed, or emotionally distressed but have no major psychiatric disorders. By tracking weekly changes, the research aims to identify how mindfulness intervention leads to emotional improvement and which skills play the most important roles in that process.