body { font-family: Arial; background: #f0f0f0; margin: 0; padding: 0; }
header, footer { background: #333; color: white; text-align: center; padding: 1em; }
nav { background: #eee; text-align: center; padding: 1em; }
nav a { margin: 0 10px; color: #333; text-decoration: none; }
main { max-width: 900px; background: white; margin: 20px auto; padding: 20px; }
form input, form textarea { width: 100%; margin-bottom: 10px; padding: 8px; }
.section { margin-top: 20px; }