Smart architecture is intelligent. It may be the work of an intelligent designer who succeeds in finding his way through a tricky design situation with surprising simplicity. But there can also be an intelligent building or space that interacts with its environment and which adapts to the user's wishes. Smart architecture is not complicated. It may well be complex but it is no more complex than necessary.
Smart architecture is sometimes surprisingly simple.
A smart solution is often the kind of solution that is obvious after the event. If only I'd thought of that myself'. Simple solutions are anything but dumb. Smart architecture is beautiful and elegant. In the same way that a good solution for a mathematical theorem can be beautiful and elegant.