A Multi-Center Randomized Controlled Trial on the Impact of Disease Subtype-Based Active Video Education on Bowel Preparation Quality in Patients With Inflammatory Bowel Disease

Inclusion Criteria: 1. Age between 18 and 75 years, inclusive. 2. Confirmed diagnosis of Ulcerative Colitis (UC) or Crohn's disease (CD) according to standard clinical guidelines. 3. Scheduled for elective colonoscopy for IBD monitoring or disease activity assessment. 4. Able to understand written and verbal instructions and to use a smartphone to view video education materials. 5. Voluntary participation with written informed consent. Exclusion Criteria: 1. Absolute contraindications to colonoscopy, including acute gastrointestinal perforation, fulminant colitis, toxic megacolon, or hemodynamic instability. 2. History of total or subtotal colectomy. 3. Acute or chronic intestinal obstruction. 4. Severe cardiac, pulmonary, hepatic, or renal insufficiency (eGFR \<30 mL/min/1.73m², NYHA class III/IV). 5. Severe psychiatric or cognitive impairment that prevents understanding of the study requirements. 6. Inability or unwillingness to provide written informed consent. 7. Pregnant or breastfeeding women.