v3.26.3
Cover
Sep. 28, 2026
Document Information [Line Items]  
Document Type S-1
Amendment Flag false
Entity Information [Line Items]  
Entity Registrant Name Calm Seas Acquisition Corp.
Entity Central Index Key 0002154056
Entity Primary SIC Number 6770
Entity Incorporation, State or Country Code E9
Entity Filer Category Non-accelerated Filer
Entity Small Business true
Entity Emerging Growth Company true
Entity Ex Transition Period false
Entity Contact Personnel [Line Items]  
Entity Address, Address Line One 4785 Caughlin Parkway
Entity Address, Address Line Two Reno
Entity Address, City or Town NV
Entity Address, Postal Zip Code 89519
Entity Phone Fax Numbers [Line Items]  
City Area Code 775
Local Phone Number 827-2000
Business Contact [Member]  
Entity Contact Personnel [Line Items]  
Contact Personnel Name Procter Hug IV
Entity Address, Address Line One 4785 Caughlin Parkway
Entity Address, Address Line Two Reno
Entity Address, City or Town NV
Entity Address, Postal Zip Code 89519
Entity Phone Fax Numbers [Line Items]  
City Area Code 775
Local Phone Number 827-2000