Očigledno je kartica u novčaniku.

Because očigledno is not directly describing kartica here.

In this sentence, očigledno means something like obviously or it is obvious. Serbian often uses the neuter singular in this kind of impersonal construction:

• Očigledno je... = It is obvious...
• Moguće je... = It is possible...
• Važno je... = It is important...

So it does not agree with kartica.

If it did agree with kartica, you would get očigledna kartica, which would mean an obvious card. That is a different idea.

Je is the 3rd person singular present of biti = to be.

So in this sentence it is the equivalent of is.

A very literal breakdown is:

• Očigledno je = It is obvious / Obviously
• kartica = the card / a card
• u novčaniku = in the wallet

Because je is a clitic in Serbian, and clitics normally go in the second position of the clause.

That is why Serbian often places je very early:

• Kartica je u novčaniku.
• Očigledno je kartica u novčaniku.

A native English speaker may expect something like Očigledno kartica je..., but that is not the normal Serbian pattern. Standard Serbian prefers the clitic je in the second slot.

Yes, you can think of it that way.

The fuller, more explicit version is:

• Očigledno je da je kartica u novčaniku.

That literally means It is obvious that the card is in the wallet.

The given sentence is more compact. Serbian often allows this kind of compression when the meaning is clear. A learner should recognize that the fuller da version is very common and often easier to understand at first.

Novčaniku is locative singular of novčanik = wallet.

It appears after u because u with a meaning of location takes the locative:

• u novčaniku = in the wallet

Compare that with motion toward something, where u takes the accusative:

• Stavljam karticu u novčanik. = I am putting the card into the wallet.

So:

• u novčaniku = location, already inside
• u novčanik = movement into

Kartica is in the nominative singular.

It is the subject of the sentence, so nominative is exactly what you would expect.

Basic form:

• kartica = nominative singular

Some other forms you might see:

• kartice = genitive singular / nominative plural, depending on context
• karticu = accusative singular
• kartici = dative/locative singular

Because Serbian has no articles.

So kartica can mean:

• a card
• the card

and novčanik can mean:

• a wallet
• the wallet

The exact meaning depends on context.

That is very normal in Serbian. Learners have to get used to understanding definiteness from the situation rather than from a separate word like the.

Yes. Serbian word order is more flexible than English, but the different versions can sound more or less natural depending on emphasis.

Possible versions include:

• Kartica je u novčaniku. = neutral statement
• Kartica je očigledno u novčaniku. = emphasis on obviously
• Očigledno, kartica je u novčaniku. = Obviously, the card is in the wallet
• U novčaniku je kartica. = stronger focus on in the wallet

The given order is understandable, but in everyday speech many speakers might prefer one of the alternatives above, especially Kartica je očigledno u novčaniku or Očigledno je da je kartica u novčaniku.

It is understandable, but many learners will more often hear one of these:

• Kartica je očigledno u novčaniku.
• Očigledno, kartica je u novčaniku.
• Očigledno je da je kartica u novčaniku.

The given sentence feels a bit compressed. It is useful to understand, but for active speaking, the alternatives above may sound more natural and easier to produce.

No. Kartica is a general word for a card, and the exact type depends on context.

It can mean things like:

• a bank card
• an ID card
• a membership card
• a SIM card

So if the sentence is shown without context, kartica is simply card. The surrounding situation tells you which kind.