Condensed Balance Sheets - USD ($)	Sep. 30, 2025	Dec. 31, 2024
Current assets:
Cash	$ 1,281	$ 1,425
Prepaid expenses	25,464	15,313
Total current assets	26,745	16,738
Investment held in Trust Account	16,023,769	15,240,284
Total assets	16,050,514	15,257,022
Current liabilities:
Accounts payable and accrued expenses	1,334,872	1,500,701
Due to HCYC	586,553
Total current liabilities	3,968,625	3,331,500
Deferred underwriting commission	2,415,000	2,415,000
Total liabilities	6,383,625	5,746,500
Commitments and Contingencies (Note 6)
Ordinary shares subject to possible redemption, 1,335,250 shares at redemption value of $12.00 and $11.41 per share as of September 30, 2025 and December 31, 2024 respectively	16,023,769	15,240,284
Shareholders’ Deficit:
Preferred shares, $0.0001 par value; 1,000,000 shares authorized; none issued and outstanding
Ordinary Shares, $0.0001 par value; 200,000,000 shares authorized; 2,134,200 shares issued and outstanding at September 30, 2025 and December 31, 2024 respectively	214	214
Additional paid-in capital
Accumulated deficit	(6,357,094)	(5,729,976)
Total Shareholders’ Deficit	(6,356,880)	(5,729,762)
Total Liabilities, Temporary Equity and Shareholders’ Deficit	16,050,514	15,257,022
Related Party [Member]
Current liabilities:
Promissory notes – related party	1,262,500	1,262,500
Due to related parties	$ 784,700	$ 568,299

Due to HCYC.

No definition available.

Name:	ATMC_DueToHcyc
Namespace Prefix:	ATMC_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).