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Accrued Liabilities and Other Payables (Details) - USD ($)	Jun. 30, 2025	Dec. 31, 2024
Accrued liabilities and other payables	$ 30,423	$ 63,415
Credit card payable [Member]
Accrued liabilities and other payables	26,496	58,269
Payroll tax payable [Member]
Accrued liabilities and other payables	$ 3,927	$ 5,146

X

- Definition

Amount of liabilities incurred and payable to vendors for goods and services received classified as other, and expenses incurred but not yet paid, payable within one year or the operating cycle, if longer.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherAccountsPayableAndAccruedLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=class_CreditCardPayableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=class_PayrollTaxPayableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: