body { font-family: Arial, sans-serif; margin: 0; padding: 0; line-height: 1.6; }
header, footer { background: #111; color: #fff; padding: 16px; }
nav a, footer a { color: #fff; margin-right: 12px; text-decoration: none; }
main { max-width: 1100px; margin: 0 auto; padding: 24px; }
section { margin-bottom: 32px; }
.card { border: 1px solid #ddd; padding: 16px; margin-bottom: 16px; }