body { font-family: Arial, sans-serif; margin: 0; padding: 0; background: #f9fafb; color: #111; }
header { background: #0f172a; color: white; padding: 20px; text-align: center; }
main { padding: 20px; }
section { margin-bottom: 20px; }
footer { background: #f1f5f9; color: #334155; text-align: center; padding: 10px; font-size: 0.9em; }