body { font-family: Arial, sans-serif; margin: 0; background: #f5f5f5; }
.container { max-width: 800px; margin: 0 auto; padding: 20px; }
nav a { margin-right: 12px; text-decoration: none; color: #333; }
.card { background: #fff; padding: 16px; margin: 16px 0; border-radius: 8px; box-shadow: 0 2px 5px rgba(0,0,0,0.1); }
.footer { text-align: center; margin-top: 20px; color: #666; }