Learn Spanish (Latin America): La sopa de tomate está súper deliciosa.

No, súper never changes its form. Here it acts as an intensifier (functioning like a prefix or adverb), not a normal adjective. Whether you are describing one feminine soup or multiple masculine tacos, it stays exactly the same: súper deliciosa or súper deliciosos.

Is súper always written as a separate word with an accent mark?

In casual, everyday writing (like text messages and social media), native speakers write súper deliciosa as two words constantly. However, the official spelling rule from the Royal Spanish Academy says it should be attached directly to the adjective as a prefix without an accent mark: superdeliciosa. It is helpful to understand both the official rule and how people actually write in real life!

Why use está instead of es? Isn't being delicious a characteristic of the soup?

Using estar with food means you are commenting on how it tastes to you right now. It is similar to saying "this soup is tasting delicious." If you used es, you would be making a general statement about tomato soup as a concept (meaning "tomato soup is a delicious type of food"). Está deliciosa focuses on your immediate, personal experience of eating this specific bowl.

Why is it sopa de tomate rather than just tomate sopa?