v3.26.1
Cover - $ / shares
6 Months Ended
Jun. 30, 2026
Aug. 14, 2026
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Jun. 30, 2026  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2026  
Current Fiscal Year End Date --12-31  
Entity File Number 001-43139  
Entity Registrant Name ClearThink 1 Acquisition Corp.  
Entity Central Index Key 0002094073  
Entity Tax Identification Number 00-0000000  
Entity Incorporation, State or Country Code E9  
Entity Address, Address Line One 150 E. Palmetto Park Road  
Entity Address, Address Line Two Suite 202  
Entity Address, City or Town Boca Raton  
Entity Address, State or Province FL  
Entity Address, Postal Zip Code 33432  
City Area Code (561)  
Local Phone Number 358-3696  
Entity Current Reporting Status No  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Elected Not To Use the Extended Transition Period false  
Entity Shell Company true  
Units, each consisting of one Class A Ordinary Share and one Right to receive one-fifth (1/5) of one Class A Ordinary Share    
Title of 12(b) Security Units, each consisting of one Class A Ordinary Share and one Right to receive one-fifth (1/5) of one Class A Ordinary Share  
Trading Symbol CTAAU  
Security Exchange Name NASDAQ  
Class A Ordinary Shares, par value $0.0001 per share    
Title of 12(b) Security Class A Ordinary Shares, par value $0.0001 per share  
Trading Symbol CTAA  
Security Exchange Name NASDAQ  
Rights, each entitling the holder to receive one-fifth (1/5) of one Class A Ordinary Share [Member]    
Title of 12(b) Security Rights, each entitling the holder to receive one-fifth (1/5) of one Class A Ordinary Share  
Trading Symbol CTAAR  
Security Exchange Name NASDAQ  
Common Class A [Member]    
Entity Common Stock, Shares Outstanding   12,830,000
Entity Listing, Par Value Per Share $ 0.0001  
Common Class B [Member]    
Entity Common Stock, Shares Outstanding   4,171,667
Entity Listing, Par Value Per Share $ 0.0001