diff --git a/data_visualization/css/layout.css b/data_visualization/css/layout.css
new file mode 100644
index 0000000..49918ab
--- /dev/null
+++ b/data_visualization/css/layout.css
@@ -0,0 +1,99 @@
+:root {
+  --primary: #2a6fb0;
+  --secondary: #f3f4f6;
+  --text-color: #1c1c1c;
+  --spacing-sm: 0.5rem;
+  --spacing-md: 1rem;
+  --spacing-lg: 2rem;
+  --font-base: 'Arial', sans-serif;
+  --border-radius: 0.5rem;
+  --breakpoint-md: 768px;
+}
+
+/* =============================
+   Panel Layouts
+   ============================= */
+
+.data-panel {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  gap: var(--spacing-lg);
+  padding: var(--spacing-lg);
+  background-color: var(--secondary);
+  border-radius: var(--border-radius);
+  color: var(--text-color);
+  font-family: var(--font-base);
+}
+
+.data-panel__section {
+  background-color: #fff;
+  border-radius: var(--border-radius);
+  padding: var(--spacing-md);
+  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
+  overflow: hidden;
+}
+
+.image-gallery {
+  display: flex;
+  flex-wrap: wrap;
+  gap: var(--spacing-md);
+  padding: var(--spacing-md);
+  justify-content: center;
+  background-color: var(--secondary);
+  border-radius: var(--border-radius);
+}
+
+.image-gallery__item {
+  flex: 1 1 calc(25% - var(--spacing-md));
+  background-color: #fff;
+  border-radius: var(--border-radius);
+  overflow: hidden;
+  aspect-ratio: 1 / 1;
+  position: relative;
+}
+
+.image-gallery__item:hover {
+  outline: 2px solid var(--primary);
+  cursor: zoom-in;
+}
+
+/* =============================
+   Responsive Design
+   ============================= */
+
+@media (max-width: 768px) {
+  .data-panel {
+    grid-template-columns: 1fr;
+    gap: var(--spacing-md);
+  }
+
+  .image-gallery {
+    flex-direction: column;
+    align-items: center;
+  }
+
+  .image-gallery__item {
+    flex: 1 1 100%;
+    max-width: 90%;
+  }
+}
+
+/* =============================
+   Footer (Copyright)
+   ============================= */
+
+footer {
+  text-align: center;
+  padding: var(--spacing-md);
+  font-size: 0.9rem;
+  color: var(--text-color);
+  background-color: #e5e7eb;
+}
+
+footer p {
+  margin: 0;
+}
+
+footer p::after {
+  content: " © 2026 Donau2Space.de";
+}
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