Meaning of 真っ in Japanese

外は真っ暗だった。
It was pitch black outside.

いつも真っ向勝負だけでなく、たまには虚虚実実の駆け引きとやらもやってみたいよね。
We have to be ready not only for a straightforward test of strength, but also for a struggle in which every strategy comes into play.

コンサートの真最中に劇場を出なければならなかった。
I had to leave the theatre in the middle of the concert.

トムは仕事のことでは真っ正直だ。
Tom is scrupulous in matters of business.

花は今や真っ盛りです。
The flowers are at their best now.

真っ赤な夕焼けは明日の晴天を告げた。
The deep red of the setting sun portended fine weather.

そいつは真っ赤なうそだ。
That's a blessed lie.

あすの朝まっさきにそれを片付けます。
I'll do that first thing in the morning.

彼は真っ昼間に車を盗まれた。
He had his car stolen in broad daylight.