body { font-family: Arial, sans-serif; background-color: #f4f4f4; }
header { background: #0044cc; color: white; padding: 10px 0; text-align: center; }
nav ul { list-style-type: none; padding: 0; }
nav ul li { display: inline; margin: 0 20px; }
main { max-width: 800px; margin: 20px auto; padding: 20px; background: white; border-radius: 8px; box-shadow: 0 0 10px rgba(0,0,0,0.1); }
section { margin-bottom: 20px; }
footer { text-align: center; padding: 10px 0; background: #0044cc; color: white; }