Prohibits specified puberty blockers, cross‑sex hormones, and sex‑related surgeries for people under 18 and creates a private right to sue providers, hospitals, and clinics that participate. The law defines key terms and narrow exceptions (medically necessary care, treatment of complications, other serious organ conditions, and detransition care), requires providers to meet a high evidentiary standard before invoking exceptions, shifts certain burdens to providers in litigation, sets long statutes of limitation for claims, and includes a severability rule.