Memory Game

Requirements

• Display twelve face-down cards containing six pairs. Card markup and CSS are supplied.
• Shuffle a new deck using the supplied stable card IDs. Clicking a card reveals it.
• Allow at most two unmatched cards to be revealed. Ignore an already revealed or matched card.
• Count one move when the second card is revealed. Keep matching cards face-up and disable them.
• Keep a mismatched pair visible for 600 ms, blocking other picks until both hide.
• Show a win message after all six pairs are matched. Restart shuffles the deck and resets moves and matches.
• Restart and unmount must cancel any pending mismatch timeout.

Examples

Input: Reveal two matching cards
Output: 1 move; both cards remain face-up