We are building a fun Flip Card Memory Game. Start with a playful home screen that has a big, friendly title at the top saying "Flip Card Memory Game" and a short subtitle underneath saying "Choose your topic to start playing." Below that, show three large colorful cards with emojis and labels for Animals, Fruits, and Space. When a person clicks one of these cards, they should be taken to the game for that topic. The whole page should feel bright, rounded, kid-friendly, and cheerful with a fun, bold font and smooth hover or tap effects. Make sure it looks good on both phones and laptops.