Sustav e-Građani danas radi bez problema.

Because the grammatical subject is sustav = system, and sustav is singular.

So the structure is:

• Sustav = subject, singular
• e-Građani = the name of the system
• radi = works / is functioning, 3rd person singular

Even though građani by itself means citizens and is plural, here it is part of the official name e-Građani. The verb agrees with sustav, not with građani.

Here radi means works, is working, or is functioning.

It is from the verb raditi, which can mean:

• to work in the sense of having a job
• to work / function for machines, systems, websites, devices, etc.

In this sentence, it clearly means that the system is functioning properly.

So:

• Sustav radi. = The system works / is working.

Radi is the 3rd person singular present tense of raditi.

A few present-tense forms are:

• ja radim = I work
• ti radiš = you work
• on/ona/ono radi = he/she/it works

Since sustav is singular, Croatian uses radi.

Croatian does not have articles like the or a/an.

So where English says:

• the system
• a system

Croatian simply says:

• sustav

Whether it means a system or the system depends on context. In this sentence, English naturally translates it as the e-Građani system.

Here e-Građani is being used as the official name of the platform/system, and names like this are often left unchanged, especially in formal or technical language.

So:

• Sustav e-Građani = the e-Građani system

You can think of e-Građani here as a name placed after sustav to specify which system it is.

A learner may expect a plural agreement because građani is a normal plural noun by itself, but in this sentence it behaves as part of a proper name, not as the grammatical head of the phrase.

Danas means today.

It is an adverb of time, and it tells you when the system is working without problems.

Croatian word order is flexible, so danas can often move around depending on emphasis. For example:

• Sustav e-Građani danas radi bez problema.
• Danas sustav e-Građani radi bez problema.

Both are possible. The original sentence is a very natural neutral order.

Bez problema literally means without problem or without problems, but idiomatically it means:

• without any problems
• smoothly
• fine

The preposition bez always takes the genitive case.

So:

• dictionary form: problem
• after bez: problema

This is why it is bez problema, not bez problem.

Formally, problema here is the genitive singular form of problem.

But in everyday meaning, bez problema is often understood idiomatically as:

• without any problem
• without any problems
• no problem / no issues

So even though the Croatian form is singular, English may translate it more naturally with a plural.

Yes, that is grammatically possible, but it sounds less natural in English.

More natural English translations would be:

• The e-Građani system is working fine today.
• The e-Građani system is working without problems today.
• Today, the e-Građani system is working normally.
• The e-Građani system is functioning properly today.

So the Croatian sentence is simple, but the best English translation depends on natural English style, not just word-for-word matching.

Yes. Croatian allows more flexible word order than English.

For example, these are possible:

• Sustav e-Građani danas radi bez problema.
• Danas sustav e-Građani radi bez problema.
• Sustav e-Građani radi danas bez problema.

The basic meaning stays the same, but the emphasis changes slightly.

The original version sounds neutral and natural:

• first the topic: Sustav e-Građani
• then time: danas
• then the verb and manner: radi bez problema

Context and usage tell you that e-Građani is the name of a government platform/service.

So sustav e-Građani is best understood as:

• the e-Građani system

not as a literal possessive phrase like:

• the system of e-citizens

This is common with names of services, websites, apps, and institutions: a general noun like sustav, portal, or aplikacija is followed by the official name.

Građani is pronounced approximately like GRAH-jah-nee, though not exactly in English sounds.

A few pronunciation notes:

• gr = as written
• a = short a
• đ = a soft sound somewhat like the j in judge, but lighter
• ani = ah-nee

So e-Građani is roughly eh-GRAH-jah-nee.

The letter đ is different from d and dj in English spelling, so it takes some practice.