v3.26.1

Cover - $ / shares	3 Months Ended
Cover - $ / shares	Mar. 31, 2026	May 15, 2026
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Mar. 31, 2026
Document Fiscal Period Focus	Q1
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		12,515,000
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

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Clearthink 1 Acquisition Corp. 10-Q