diff --git a/visualization_tool/css/layout.css b/visualization_tool/css/layout.css
new file mode 100644
index 0000000..be0ea9d
--- /dev/null
+++ b/visualization_tool/css/layout.css
@@ -0,0 +1,80 @@
+:root {
+  --primary: #2c3e50;
+  --background: #f8f9fa;
+  --text-color: #222;
+  --critical: #e74c3c;
+  --spacing-sm: 0.5rem;
+  --spacing-md: 1rem;
+  --spacing-lg: 2rem;
+  --border-radius: 4px;
+  --max-width: 1200px;
+}
+
+/* =========================
+   App-Struktur
+   ========================= */
+body {
+  margin: 0;
+  font-family: sans-serif;
+  color: var(--text-color);
+  background-color: var(--background);
+  display: flex;
+  flex-direction: column;
+  min-height: 100vh;
+}
+
+.app-header {
+  background-color: var(--primary);
+  color: #fff;
+  padding: var(--spacing-md);
+  text-align: center;
+  flex-shrink: 0;
+}
+
+.results-section {
+  display: flex;
+  flex-direction: row;
+  gap: var(--spacing-lg);
+  justify-content: space-between;
+  align-items: flex-start;
+  flex: 1;
+  max-width: var(--max-width);
+  margin: var(--spacing-lg) auto;
+  padding: 0 var(--spacing-md);
+}
+
+.results-section .table-container {
+  flex: 2;
+  overflow-x: auto;
+}
+
+.chart-panel {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  gap: var(--spacing-md);
+  background-color: #fff;
+  border: 1px solid #ddd;
+  border-radius: var(--border-radius);
+  padding: var(--spacing-md);
+}
+
+.app-footer {
+  background-color: var(--primary);
+  color: #fff;
+  text-align: center;
+  padding: var(--spacing-sm);
+  flex-shrink: 0;
+}
+
+/* =========================
+   Responsive Behavior
+   ========================= */
+@media (max-width: 800px) {
+  .results-section {
+    flex-direction: column;
+  }
+  .chart-panel {
+    width: 100%;
+  }
+}
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