<style>
  /* Grundlayout */
  body {
    font-family: "Inter", Arial, sans-serif;
    background: #eef2f7;
    margin: 0;
    padding: 0;
    line-height: 1.7;
    color: #2c3e50;
  }

  /* Header */
  header {
    background: linear-gradient(135deg, #4c8dff, #0066ff);
    color: white;
    padding: 25px 15px;
    text-align: center;
    font-size: 1.8rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.15);
  }

  /* Navigation */
  nav {
    margin-top: 12px;
  }

  nav a {
    color: white;
    text-decoration: none;
    margin: 0 12px;
    font-weight: 500;
    padding: 6px 10px;
    border-radius: 6px;
    transition: background 0.2s;
  }

  nav a:hover {
    background: rgba(255,255,255,0.25);
  }

  /* Hauptbereich */
  main {
    max-width: 900px;
    margin: 30px auto;
    background: white;
    padding: 30px;
    border-radius: 18px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
  }

  /* Footer */
  footer {
    text-align: center;
    padding: 20px;
    background: #0066ff;
    color: white;
    margin-top: 40px;
    font-size: 0.95rem;
    letter-spacing: 0.3px;
  }

  /* Mobile Navigation */
  @media (max-width: 600px) {
    nav a {
      display: block;
      margin: 10px 0;
      padding: 10px;
      background: rgba(255,255,255,0.15);
    }

    main {
      margin: 15px;
      padding: 20px;
    }
  }
</style>
