Curious About How the Lightning Network Works?

So, how does the Lightning Network actually work if one or both users are offline? Like, how can the person getting the funds access them if they're not connected?

Electrum Lightning Network walkthrough gives you guides on how to send bitcoin as well as how to receive bitcoin through Lightning Network. The sender must receive the invoice from the receiver, and the receiver must be online too (like turn on the Electrum wallet). There are other conditions like availability of route to the destination node, inbound capacity and more.

The standard way as explained above is that the receiver must be online to actually be online to sign the transaction and also update the balance, this cannot be done while the Receiver is offline. But now there are third part services that acts as intermediate between the receiver and sender, this third party service have nodes that are always online to recieve the coins on behalf of the receiver until he comes online and it’s then route to it. An example as indicated in the thread link shared above is BlueWallet which has an always online node available to receive the coin and the update the balance themselves.