Dodging Panache while Unaware of an Attack

[Cao Phen]

Dodging Panache wrote:

At 1st level, when an opponent attempts a melee attack against the swashbuckler, the swashbuckler can as an immediate action spend 1 panache point to move 5 feet; doing so grants the swashbuckler a dodge bonus to AC equal to her Charisma modif ier (minimum 0) against the triggering attack. This movement doesn’t negate the attack, which is still resolved as if the swashbuckler had not moved from the original square. This movement is not a 5-foot step; it provokes attacks of opportunity from creatures other than the one who triggered this deed. The swashbuckler can only perform this deed while wearing light or no armor, and while carrying no heavier than a light load.

It states that the it is prohibited from use if not wearing light or no armor, but is it usable while unaware or flat-footed, like if attacked by a large creature in darkness?

[Trekkie90909]

Flat Footed Condition wrote:

A character who has not yet acted during a combat is flat-footed, unable to react normally to the situation. A flat-footed character loses his Dexterity bonus to AC and Combat Maneuver Defense (CMD) (if any) and cannot make attacks of opportunity, unless he has the Combat Reflexes feat or Uncanny Dodge class ability.

Characters with Uncanny Dodge retain their Dexterity bonus to their AC and can make attacks of opportunity before they have acted in the first round of combat.

The inability to react would include the inability to take immediate actions.