Füge Navigation und umfassende SEO-Optimierung hinzu

- Sticky Navigation mit Logo und Menü-Links
- Mobile Hamburger-Menü mit Smooth Scroll
- Back-to-Top Button mit Scroll-Effekt
- Umfassende SEO Meta-Tags (Keywords, Description, Geo)
- Open Graph und Twitter Card Tags für Social Media
- Schema.org strukturierte Daten (InsuranceAgency, Person)
- robots.txt und sitemap.xml für Suchmaschinen
- Canonical URLs auf allen Seiten
- Local SEO Optimierung für Kallmünz/Regensburg

style.css

@@ -26,6 +26,110 @@ body {
     line-height: 1.6;
     color: var(--text-dark);
     background-color: var(--white);
+    padding-top: 70px;
+}
+
+/* Navigation */
+.navbar {
+    position: fixed;
+    top: 0;
+    left: 0;
+    right: 0;
+    background-color: var(--white);
+    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
+    z-index: 1000;
+    transition: all 0.3s ease;
+}
+
+.navbar.scrolled {
+    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.15);
+}
+
+.nav-content {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    padding: 15px 0;
+}
+
+.nav-logo {
+    display: flex;
+    align-items: center;
+    gap: 12px;
+    text-decoration: none;
+    color: var(--primary-color);
+    font-weight: 700;
+    font-size: 1.1rem;
+}
+
+.nav-logo-img {
+    height: 40px;
+    width: auto;
+}
+
+.nav-menu {
+    display: flex;
+    list-style: none;
+    gap: 35px;
+    margin: 0;
+}
+
+.nav-link {
+    text-decoration: none;
+    color: var(--text-dark);
+    font-weight: 600;
+    font-size: 1rem;
+    transition: color 0.3s ease;
+    position: relative;
+}
+
+.nav-link::after {
+    content: '';
+    position: absolute;
+    bottom: -5px;
+    left: 0;
+    width: 0;
+    height: 2px;
+    background-color: var(--primary-color);
+    transition: width 0.3s ease;
+}
+
+.nav-link:hover {
+    color: var(--primary-color);
+}
+
+.nav-link:hover::after {
+    width: 100%;
+}
+
+.nav-toggle {
+    display: none;
+    flex-direction: column;
+    gap: 5px;
+    background: none;
+    border: none;
+    cursor: pointer;
+    padding: 5px;
+}
+
+.nav-toggle span {
+    width: 25px;
+    height: 3px;
+    background-color: var(--primary-color);
+    transition: all 0.3s ease;
+    border-radius: 3px;
+}
+
+.nav-toggle.active span:nth-child(1) {
+    transform: rotate(45deg) translate(8px, 8px);
+}
+
+.nav-toggle.active span:nth-child(2) {
+    opacity: 0;
+}
+
+.nav-toggle.active span:nth-child(3) {
+    transform: rotate(-45deg) translate(7px, -7px);
 }
 
 .container {
@@ -346,6 +450,45 @@ body {
     height: 450px;
 }
 
+/* Back to Top Button */
+.back-to-top {
+    position: fixed;
+    bottom: 30px;
+    right: 30px;
+    width: 50px;
+    height: 50px;
+    background-color: var(--primary-color);
+    color: var(--white);
+    border: none;
+    border-radius: 50%;
+    cursor: pointer;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    box-shadow: var(--shadow-lg);
+    opacity: 0;
+    visibility: hidden;
+    transform: translateY(20px);
+    transition: all 0.3s ease;
+    z-index: 1000;
+}
+
+.back-to-top.visible {
+    opacity: 1;
+    visibility: visible;
+    transform: translateY(0);
+}
+
+.back-to-top:hover {
+    background-color: var(--secondary-color);
+    transform: translateY(-3px);
+    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.2);
+}
+
+.back-to-top:active {
+    transform: translateY(-1px);
+}
+
 /* Footer */
 .footer {
     background-color: var(--primary-color);
@@ -375,6 +518,45 @@ body {
 
 /* Responsive Design */
 @media (max-width: 968px) {
+    .nav-toggle {
+        display: flex;
+    }
+    
+    .nav-menu {
+        position: fixed;
+        top: 70px;
+        left: -100%;
+        flex-direction: column;
+        background-color: var(--white);
+        width: 100%;
+        text-align: center;
+        transition: left 0.3s ease;
+        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.1);
+        padding: 20px 0;
+        gap: 0;
+    }
+    
+    .nav-menu.active {
+        left: 0;
+    }
+    
+    .nav-menu li {
+        padding: 15px 0;
+        border-bottom: 1px solid #f0f0f0;
+    }
+    
+    .nav-menu li:last-child {
+        border-bottom: none;
+    }
+    
+    .nav-link::after {
+        display: none;
+    }
+    
+    body {
+        padding-top: 70px;
+    }
+    
     .hero-content {
         grid-template-columns: 1fr;
         gap: 40px;