темную

темную

"Темную" means "dark" (feminine singular accusative form).

Here, 'темную' is used as an adjective describing 'atmosфера' in accusative case, matching the noun it modifies.

В комнате была темную атмосферу.

There was a dark atmosphere in the room.

Here, 'темную' describes 'ночь', which is in accusative case due to its role as the direct object of the verb 'вспомнил'.

Он вспомнил темную ночь в лесу.

He remembered a dark night in the forest.

In this context, 'темную' modifies 'куртку' (accusative singular feminine) as a descriptive adjective.

Она надела темную куртку, чтобы согреться.

She put on a dark jacket to keep warm.