body {
  font-family: Arial, sans-serif;
  margin: 0;
  line-height: 1.6;
  background: #f9f9f9;
  color: #333;
}

header {
  background: #336699;
  color: white;
  padding: 2rem;
  text-align: center;
}

nav {
  background: #eee;
  text-align: center;
  padding: 1rem;
}
nav a {
  margin: 0 1rem;
  text-decoration: none;
  color: #336699;
  font-weight: bold;
}
nav a:hover {
  text-decoration: underline;
}

main {
  padding: 2rem;
}

section {
  margin-bottom: 2rem;
}

footer {
  text-align: center;
  padding: 1rem;
  background: #ddd;
  font-size: 0.9rem;
}

/* Standardbild für größere Bildschirme (z.B. Desktop) */
img.desktop {
  display: block;
}

/* Kleinere Bilder für Smartphones */
img.mobile {
  display: none;
}

@media (max-width: 600px) {
  /* Bei Bildschirmen bis 600px Breite */
  img.desktop {
    display: none;
  }
  img.mobile {
    display: block;
  }
}