How to Say "civic" in Spanish
The most common Spanish word for “civic” is “ciudadano” — use 'ciudadano' when referring to the rights, duties, or responsibilities associated with being a member of a city or country, emphasizing active participation..
ciudadano
thiu-da-DHAH-noh (Spain) / siu-da-DHAH-noh (Latin America)/θjuðaˈðano/ (Spain) / /sjuðaˈðano/ (Latin America)

Examples
Es importante promover la participación ciudadana.
It is important to promote civic participation.
La responsabilidad ciudadana incluye cuidar el medio ambiente.
Citizen responsibility includes taking care of the environment.
Adjective Agreement
When used as an adjective, 'ciudadano' must agree in gender and number with the noun it describes. For example, 'responsabilidad ciudadana' (feminine singular) or 'deberes ciudadanos' (masculine plural).
civil
/see-VEEL//θiˈβil/

Examples
La guerra civil dividió al país en dos bandos.
The civil war divided the country into two sides.
Todos los empleados son civiles, no hay personal militar.
All the employees are civilian, there is no military staff.
La sociedad civil pidió más transparencia al gobierno.
Civil society asked the government for more transparency.
Adjective Agreement
Since 'civil' ends in -l, it is the same for both masculine and feminine nouns (e.g., 'el código civil' and 'la guerra civil'). It only changes form for plural: 'civiles'.
Confusing 'Civil' and 'Civic'
Mistake: “Using 'cívico' when referring to non-military life.”
Correction: Use 'civil' for non-military/general citizenry matters. 'Cívico' is usually reserved for duties or behavior related to being a good citizen (e.g., 'deber cívico' - civic duty).
Ciudadano vs. Civil
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