Condensed Balance Sheets - USD ($)	Jun. 30, 2026	Dec. 31, 2025
Current assets:
Cash	$ 1,233	$ 1,233
Prepaid expenses	50,208	1,773
Total current assets	51,441	3,006
Investment held in Trust Account	4,804,622	4,800,584
Total assets	4,856,063	4,803,590
Current liabilities:
Accounts payable and accrued expenses	1,558,917	1,462,474
Due to HCYC	892,301	752,363
Total current liabilities	4,642,746	4,292,037
Deferred underwriting commission	2,415,000	2,415,000
Total liabilities	7,057,746	6,707,037
Temporary Equity:
Ordinary shares subject to possible redemption, 411,232 and 417,436 shares at redemption value of $11.68 and $11.50 per share as of June 30, 2026 and December 31, 2025, respectively	4,804,622	4,800,584
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 June 30, 2026 and December 31, 2025, respectively	214	214
Additional paid-in capital
Accumulated deficit	(7,006,519)	(6,704,245)
Total Shareholders’ Deficit	(7,006,305)	(6,704,031)
Total Liabilities, Temporary Equity and Shareholders’ Deficit	4,856,063	4,803,590
Related Party [Member]
Current liabilities:
Promissory notes – related party	1,262,500	1,262,500
Due to related parties	$ 929,028	$ 814,700

Due to HCYC.

No definition available.

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

- Definition

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.