diff --git a/visualization_tool/css/layout.css b/visualization_tool/css/layout.css
new file mode 100644
index 0000000..15c578b
--- /dev/null
+++ b/visualization_tool/css/layout.css
@@ -0,0 +1,150 @@
+:root {
+  --color-bg: #f9fafb;
+  --color-surface: #ffffff;
+  --color-primary: #2b6cb0;
+  --color-accent: #3182ce;
+  --color-border: #e2e8f0;
+  --color-text: #1a202c;
+  --spacing-xs: 0.25rem;
+  --spacing-sm: 0.5rem;
+  --spacing-md: 1rem;
+  --spacing-lg: 2rem;
+  --font-base: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+  --radius-sm: 4px;
+  --radius-md: 6px;
+  --max-width: 1200px;
+}
+
+/* =============================
+   Header & Footer
+   ============================= */
+.app-header,
+.app-footer {
+  background-color: var(--color-surface);
+  color: var(--color-text);
+  padding: var(--spacing-md) var(--spacing-lg);
+  border-bottom: 1px solid var(--color-border);
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+}
+
+.app-header {
+  position: sticky;
+  top: 0;
+  z-index: 1000;
+}
+
+.app-footer {
+  border-top: 1px solid var(--color-border);
+  border-bottom: none;
+  justify-content: center;
+  font-size: 0.9rem;
+  text-align: center;
+}
+
+/* =============================
+   Main Dashboard Layout
+   ============================= */
+.app-main {
+  flex: 1;
+  background-color: var(--color-bg);
+  padding: var(--spacing-md);
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+}
+
+.metrics-dashboard {
+  width: 100%;
+  max-width: var(--max-width);
+  display: grid;
+  grid-template-columns: 1fr;
+  gap: var(--spacing-lg);
+}
+
+/* =============================
+   Section Panels
+   ============================= */
+.charts-section,
+.metrics-table {
+  background-color: var(--color-surface);
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius-md);
+  padding: var(--spacing-md);
+  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
+}
+
+.charts-section {
+  display: flex;
+  flex-direction: column;
+  gap: var(--spacing-md);
+}
+
+.metrics-table {
+  overflow-x: auto;
+}
+
+/* =============================
+   Filter Controls
+   ============================= */
+.filter-controls {
+  display: flex;
+  align-items: center;
+  justify-content: flex-end;
+  gap: var(--spacing-sm);
+  margin-bottom: var(--spacing-md);
+}
+
+.filter-controls button {
+  background-color: var(--color-primary);
+  color: #fff;
+  border: none;
+  border-radius: var(--radius-sm);
+  padding: var(--spacing-sm) var(--spacing-md);
+  cursor: pointer;
+  transition: background-color 0.2s ease;
+}
+
+.filter-controls button:hover,
+.filter-controls button:focus {
+  background-color: var(--color-accent);
+}
+
+.filter-controls button.active {
+  background-color: var(--color-accent);
+  font-weight: 600;
+}
+
+/* =============================
+   Responsive Design
+   ============================= */
+@media (min-width: 640px) {
+  .metrics-dashboard {
+    grid-template-columns: repeat(2, 1fr);
+  }
+}
+
+@media (min-width: 1024px) {
+  .metrics-dashboard {
+    grid-template-columns: repeat(3, 1fr);
+  }
+}
+
+/* =============================
+   Accessibility Helpers
+   ============================= */
+:focus {
+  outline: 2px solid var(--color-accent);
+  outline-offset: 2px;
+}
+
+/* =============================
+   Footer Copyright
+   ============================= */
+.app-footer::after {
+  content: '© 2026 Donau2Space.de';
+  display: block;
+  margin-top: var(--spacing-xs);
+  color: var(--color-text);
+} 
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