diff --git a/css/main.css b/css/main.css
index 60ad909..7077513 100644
--- a/css/main.css
+++ b/css/main.css
@@ -1,5 +1,5 @@
 /* =========================
-   Allgemeine Einstellungen
+   Modernes Responsive Design
 ========================= */
 
 * {
@@ -8,27 +8,29 @@
   box-sizing: border-box;
 }
 
-html {
-  font-size: 16px;
-  scroll-behavior: smooth;
+:root {
+
+  /* Farbpalette */
+  --primary: #2563eb;
+  --primary-dark: #1d4ed8;
+  --background: #f5f7fb;
+  --surface: #ffffff;
+  --text: #1e293b;
+  --text-light: #64748b;
+  --border: #e2e8f0;
+
+  /* Schatten */
+  --shadow: 0 8px 25px rgba(0,0,0,0.08);
+
+  /* Rundungen */
+  --radius: 16px;
 }
 
 body {
-  font-family: Arial, Helvetica, sans-serif;
+  font-family: "Segoe UI", Arial, sans-serif;
+  background: var(--background);
+  color: var(--text);
   line-height: 1.6;
-  background-color: #f4f6f9;
-  color: #222;
-}
-
-/* =========================
-   Layout
-========================= */
-
-.container {
-  width: 90%;
-  max-width: 1200px;
-  margin: auto;
-  padding: 20px;
 }
 
 /* =========================
@@ -36,47 +38,110 @@ body {
 ========================= */
 
 header {
-  background: #1e3a5f;
-  color: white;
-  padding: 20px 0;
-  text-align: center;
+  background: var(--surface);
+  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
+  position: sticky;
+  top: 0;
+  z-index: 1000;
 }
 
-header h1 {
-  font-size: 2rem;
+.header-container {
+  max-width: 1200px;
+  margin: auto;
+  padding: 16px 24px;
+
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  gap: 20px;
+}
+
+/* Logo */
+
+.logo {
+  font-size: 1.5rem;
+  font-weight: 700;
+  color: var(--primary);
 }
 
 /* =========================
    Navigation
 ========================= */
 
-nav {
-  background: #16324f;
-}
-
 nav ul {
   list-style: none;
-  display: flex;
-  justify-content: center;
-  flex-wrap: wrap;
-}
 
-nav li {
-  margin: 0;
+  display: flex;
+  align-items: center;
+  gap: 18px;
 }
 
 nav a {
-  display: block;
-  padding: 15px 20px;
-  color: white;
   text-decoration: none;
-  transition: background 0.3s ease;
+  color: var(--text);
+  font-weight: 500;
+  transition: 0.25s ease;
+  padding: 8px 14px;
+  border-radius: 10px;
 }
 
 nav a:hover,
 nav a:focus {
-  background: #28527a;
+  background: #eff6ff;
+  color: var(--primary);
+}
+
+/* =========================
+   Suchfeld
+========================= */
+
+.search-box {
+  display: flex;
+  gap: 10px;
+}
+
+.search-box input {
+  padding: 10px 14px;
+  border: 1px solid var(--border);
+  border-radius: 10px;
   outline: none;
+  min-width: 220px;
+}
+
+.search-box input:focus {
+  border-color: var(--primary);
+}
+
+/* =========================
+   Buttons
+========================= */
+
+.btn {
+  padding: 10px 18px;
+  border-radius: 10px;
+  text-decoration: none;
+  font-weight: 600;
+  transition: 0.25s ease;
+  border: none;
+  cursor: pointer;
+}
+
+.btn-primary {
+  background: var(--primary);
+  color: white;
+}
+
+.btn-primary:hover {
+  background: var(--primary-dark);
+}
+
+.btn-secondary {
+  background: #eff6ff;
+  color: var(--primary);
+}
+
+.btn-secondary:hover {
+  background: #dbeafe;
 }
 
 /* =========================
@@ -84,81 +149,69 @@ nav a:focus {
 ========================= */
 
 main {
-  padding: 40px 0;
+  max-width: 1200px;
+  margin: 50px auto;
+  padding: 0 24px;
 }
 
-/* Flexbox-Layout */
+/* Hero Section */
 
-.content {
-  display: flex;
-  gap: 20px;
-  align-items: stretch;
-  flex-wrap: wrap;
+.hero {
+  background: linear-gradient(
+          135deg,
+          #2563eb,
+          #3b82f6
+  );
+
+  color: white;
+  padding: 80px 40px;
+  border-radius: var(--radius);
+  text-align: center;
+  box-shadow: var(--shadow);
+
+  margin-bottom: 50px;
+}
+
+.hero h1 {
+  font-size: 3rem;
+  margin-bottom: 20px;
+}
+
+.hero p {
+  max-width: 800px;
+  margin: auto;
+  font-size: 1.1rem;
+}
+
+/* =========================
+   Karten / Inhalte
+========================= */
+
+.content-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
+  gap: 24px;
 }
 
 .card {
-  flex: 1 1 300px;
-  background: white;
-  padding: 20px;
-  border-radius: 10px;
-  box-shadow: 0 3px 10px rgba(0,0,0,0.1);
+  background: var(--surface);
+  border-radius: var(--radius);
+  padding: 28px;
+  box-shadow: var(--shadow);
+  transition: 0.3s ease;
 }
 
-/* =========================
-   Bilder / Medien
-========================= */
-
-img,
-video {
-  max-width: 100%;
-  height: auto;
-  border-radius: 8px;
+.card:hover {
+  transform: translateY(-5px);
 }
 
-/* =========================
-   Tabellen
-========================= */
-
-.table-wrapper {
-  overflow-x: auto;
+.card h2 {
+  margin-bottom: 14px;
+  color: var(--primary);
 }
 
-table {
-  width: 100%;
-  border-collapse: collapse;
-  background: white;
-}
-
-th,
-td {
-  padding: 12px;
-  border: 1px solid #ccc;
-  text-align: left;
-}
-
-th {
-  background-color: #1e3a5f;
-  color: white;
-}
-
-/* =========================
-   Buttons
-========================= */
-
-button,
-.btn {
-  background-color: #1e3a5f;
-  color: white;
-  border: none;
-  padding: 12px 18px;
-  border-radius: 6px;
-  cursor: pointer;
-  transition: background 0.3s ease;
-}
-
-button:hover,
-.btn:hover {
-  background-color: #28527a;
+.card p {
+  color: var(--text-light);
 }
 
 /* =========================
@@ -166,11 +219,30 @@ button:hover,
 ========================= */
 
 footer {
-  background: #1e3a5f;
-  color: white;
-  text-align: center;
-  padding: 20px;
-  margin-top: 40px;
+  margin-top: 80px;
+  background: var(--surface);
+  border-top: 1px solid var(--border);
+}
+
+.footer-container {
+  max-width: 1200px;
+  margin: auto;
+  padding: 24px;
+
+  display: flex;
+  justify-content: center;
+  gap: 30px;
+  flex-wrap: wrap;
+}
+
+footer a {
+  text-decoration: none;
+  color: var(--text-light);
+  transition: 0.25s ease;
+}
+
+footer a:hover {
+  color: var(--primary);
 }
 
 /* =========================
@@ -178,8 +250,9 @@ footer {
 ========================= */
 
 a:focus,
-button:focus {
-  outline: 3px solid #ffbf47;
+button:focus,
+input:focus {
+  outline: 3px solid #93c5fd;
   outline-offset: 2px;
 }
 
@@ -187,66 +260,61 @@ button:focus {
    Responsive Design
 ========================= */
 
-/* Tablets */
+/* Tablet */
 
-@media (max-width: 992px) {
+@media (max-width: 900px) {
 
-  header h1 {
-    font-size: 1.7rem;
+  .header-container {
+    flex-direction: column;
+    align-items: stretch;
   }
 
   nav ul {
     justify-content: center;
+    flex-wrap: wrap;
   }
 
-  .content {
-    flex-direction: column;
+  .search-box {
+    justify-content: center;
+  }
+
+  .hero h1 {
+    font-size: 2.3rem;
   }
 }
 
-/* Smartphones */
+/* Smartphone */
 
 @media (max-width: 600px) {
 
-  body {
-    font-size: 15px;
+  .hero {
+    padding: 50px 25px;
   }
 
-  header {
-    padding: 15px 10px;
+  .hero h1 {
+    font-size: 2rem;
   }
 
-  header h1 {
-    font-size: 1.4rem;
+  .hero p {
+    font-size: 1rem;
   }
 
   nav ul {
     flex-direction: column;
+    gap: 10px;
   }
 
-  nav a {
+  .search-box {
+    flex-direction: column;
+  }
+
+  .search-box input {
+    width: 100%;
+    min-width: unset;
+  }
+
+  .btn {
+    width: 100%;
     text-align: center;
-    border-top: 1px solid rgba(255,255,255,0.1);
-  }
-
-  .container {
-    width: 95%;
-  }
-
-  .card {
-    padding: 15px;
-  }
-}
-
-/* Große Bildschirme */
-
-@media (min-width: 1400px) {
-
-  body {
-    font-size: 18px;
-  }
-
-  .container {
-    max-width: 1400px;
   }
 }
\ No newline at end of file