diff --git a/docs/styleguide/docs/portal_sync_flow.md b/docs/styleguide/docs/portal_sync_flow.md
index e0a3f54..952e999 100644
--- a/docs/styleguide/docs/portal_sync_flow.md
+++ b/docs/styleguide/docs/portal_sync_flow.md
@@ -7,6 +7,7 @@ Der Styleguide bleibt in diesem Repository die Source of Truth. Der Sync verteil
 - den deploy-relevanten CSS-Upstream versioniert als `public/assets/styleguide.upstream.css`
 - die vollstaendige Styleguide-Dokumentation gespiegelt nach `docs/styleguide`
 - die portal-spezifische Fertig-CSS-Datei als `public/assets/styles.css`
+- die konsumierbare Large-Table-Runtime als `public/scripts/large-table-column-resize.js`
 
 Zielrepos:
 
@@ -31,8 +32,10 @@ Beispiel:
 
 - `public/assets/styleguide.upstream.css` aktualisiert
 - `public/assets/styleguide.upstream.meta.json` aktualisiert (Version, Commit, Zeitstempel)
-- `docs/styleguide` gespiegelt (mit `--delete`, ohne `.git`, `.codex`, `AGENTS.md`, `scripts/`)
+- `docs/styleguide` gespiegelt (mit `--delete`, ohne `.git`, `.codex`, `AGENTS.md` und interne `scripts/`)
+- `public/scripts/large-table-column-resize.js` aus der Styleguide-Source-of-Truth kopiert
 - `public/assets/styles.css` aktualisiert
+- `public/scripts/large-table-column-resize.js` aktualisiert; lokale Portal-Kopien sind nicht zulässig
 - Optional: automatischer Commit + Push im Portalrepo
 
 ## Standardprozess je Release
@@ -42,3 +45,18 @@ Beispiel:
 3. Styleguide commit + push
 4. Sync-Skript ausfuehren
 5. Beide Portalrepos Smoke-Testen
+
+## Large-Table-Runtime
+
+Die Runtime liegt ausschließlich im Styleguide unter `scripts/large-table-column-resize.js`.
+Der Sync kopiert nur diese explizit freigegebene Runtime nach `public/scripts/`; andere
+Styleguide-Scripts wie Prüf- und Sync-Shellscripts werden nicht in `docs/styleguide/scripts/`
+gespiegelt. Dadurch bleibt der Styleguide die Source of Truth und ein erneuter Sync
+überschreibt die Portaldatei kontrolliert.
+
+Für den Smoke-Test in beiden Portalen ist zu prüfen:
+
+- `public/scripts/large-table-column-resize.js` ist vorhanden und unter `/scripts/large-table-column-resize.js` ladbar.
+- Die Large-Table-Seite lädt die Runtime ohne lokale Inline- oder Duplikatimplementierung.
+- Nach einer Spaltenbreitenänderung wird der Eintrag unter `sg:large-table:column-widths:<key>` gespeichert.
+- Ein erneuter Sync ersetzt die Datei aus der Styleguide-Quelle.
diff --git a/public/assets/styleguide.upstream.meta.json b/public/assets/styleguide.upstream.meta.json
index 6436eb1..9a0c4d9 100644
--- a/public/assets/styleguide.upstream.meta.json
+++ b/public/assets/styleguide.upstream.meta.json
@@ -1,7 +1,7 @@
 {
   "styleguideVersion": "2026.05.18.2",
-  "styleguideCommit": "5134b61",
-  "syncedAtUtc": "2026-09-27T06:20:05Z",
+  "styleguideCommit": "09966ce",
+  "syncedAtUtc": "2026-09-27T06:25:30Z",
   "sourceRepo": "/Users/mathias/Documents/Dokumente Chouchou/Codebases/Styleguide",
   "mirroredDocsPath": "docs/styleguide"
 }
diff --git a/public/scripts/large-table-column-resize.js b/public/scripts/large-table-column-resize.js
new file mode 100644
index 0000000..194e7a8
--- /dev/null
+++ b/public/scripts/large-table-column-resize.js
@@ -0,0 +1,242 @@
+(function initLargeTableColumnResizeModule() {
+  const STORAGE_PREFIX = 'sg:large-table:column-widths:';
+  const STORAGE_VERSION = 1;
+  const DEFAULT_MIN_WIDTH = 128;
+  const KEYBOARD_STEP = 8;
+  const KEYBOARD_LARGE_STEP = 40;
+  let activeResize = null;
+
+  const getTables = (root) => root.querySelectorAll('[data-component="large-table"][data-column-resize="true"]');
+
+  const getColumnHeaders = (table) => Array.from(
+    table.querySelectorAll('[data-component-part="large-table-header-row"] [role="columnheader"]'),
+  );
+
+  const getMinWidth = (table) => {
+    const configured = table.dataset.columnMinWidth;
+    const value = configured || getComputedStyle(table).getPropertyValue('--large-table-column-min-width').trim();
+    if (!value) {
+      return DEFAULT_MIN_WIDTH;
+    }
+
+    const probe = document.createElement('span');
+    probe.style.cssText = `position:absolute;width:${value};visibility:hidden;`;
+    table.appendChild(probe);
+    const width = probe.getBoundingClientRect().width;
+    probe.remove();
+    return width > 0 ? width : DEFAULT_MIN_WIDTH;
+  };
+
+  const parseDefaultWidth = (rawValue, tableWidth) => {
+    if (!rawValue) {
+      return null;
+    }
+    const value = Number.parseFloat(rawValue);
+    if (!Number.isFinite(value) || value <= 0) {
+      return null;
+    }
+    if (rawValue.trim().endsWith('%')) {
+      return tableWidth * value / 100;
+    }
+    if (rawValue.trim().endsWith('fr')) {
+      return value;
+    }
+    return value;
+  };
+
+  const normalizeWidths = (widths, tableWidth, minWidth) => {
+    const safeWidths = widths.map((width) => Math.max(minWidth, width));
+    const total = safeWidths.reduce((sum, width) => sum + width, 0);
+    if (total <= 0) {
+      return Array(widths.length).fill(Math.max(minWidth, tableWidth / widths.length));
+    }
+    if (widths.some((width) => width !== width)) {
+      return Array(widths.length).fill(Math.max(minWidth, tableWidth / widths.length));
+    }
+    return safeWidths.map((width) => width * tableWidth / total);
+  };
+
+  const getDefaultWidths = (table, headers, minWidth) => {
+    const tableWidth = Math.max(table.clientWidth, minWidth * headers.length);
+    const configured = headers.map((header) => parseDefaultWidth(header.dataset.defaultWidth, tableWidth));
+    if (configured.some((width) => width === null)) {
+      return Array(headers.length).fill(Math.max(minWidth, tableWidth / headers.length));
+    }
+    return normalizeWidths(configured, tableWidth, minWidth);
+  };
+
+  const getStorageKey = (table) => `${STORAGE_PREFIX}${table.dataset.columnResizeKey || ''}`;
+
+  const readStoredWidths = (table, count, minWidth) => {
+    const key = getStorageKey(table);
+    if (!table.dataset.columnResizeKey) {
+      return null;
+    }
+    try {
+      if (!window.localStorage) {
+        return null;
+      }
+      const stored = JSON.parse(window.localStorage.getItem(key));
+      if (stored?.version !== STORAGE_VERSION || !Array.isArray(stored.widths) || stored.widths.length !== count) {
+        return null;
+      }
+      if (stored.widths.some((width) => !Number.isFinite(width) || width < minWidth)) {
+        return null;
+      }
+      return stored.widths;
+    } catch (error) {
+      return null;
+    }
+  };
+
+  const writeStoredWidths = (table, widths) => {
+    if (!table.dataset.columnResizeKey) {
+      return;
+    }
+    try {
+      if (!window.localStorage) {
+        return;
+      }
+      window.localStorage.setItem(getStorageKey(table), JSON.stringify({
+        version: STORAGE_VERSION,
+        widths: widths.map((width) => Math.round(width)),
+      }));
+    } catch (error) {
+      // Storage can be unavailable in privacy-restricted browser contexts.
+    }
+  };
+
+  const updateHandleState = (table, widths, minWidth) => {
+    const handles = table.querySelectorAll('[data-large-table-resize-handle]');
+    handles.forEach((handle) => {
+      const index = Number.parseInt(handle.dataset.largeTableResizeHandle, 10);
+      const current = widths[index];
+      const maximum = Math.max(minWidth, widths[index] + widths[index + 1] - minWidth);
+      if (table.id) {
+        handle.setAttribute('aria-controls', table.id);
+      }
+      handle.setAttribute('aria-valuemin', String(Math.round(minWidth)));
+      handle.setAttribute('aria-valuemax', String(Math.round(maximum)));
+      handle.setAttribute('aria-valuenow', String(Math.round(current)));
+      handle.setAttribute('aria-valuetext', `${Math.round(current)} Pixel`);
+    });
+  };
+
+  const applyWidths = (table, widths, minWidth) => {
+    const safeWidths = widths.map((width) => Math.max(minWidth, width));
+    const total = safeWidths.reduce((sum, width) => sum + width, 0);
+    table.style.setProperty('--large-table-grid-template-columns', safeWidths.map((width) => `${width}px`).join(' '));
+    table.style.setProperty('--large-table-grid-min-width', `${Math.ceil(total)}px`);
+    table._largeTableColumnWidths = safeWidths;
+    updateHandleState(table, safeWidths, minWidth);
+  };
+
+  const resetWidths = (table) => {
+    const headers = getColumnHeaders(table);
+    const minWidth = getMinWidth(table);
+    const widths = getDefaultWidths(table, headers, minWidth);
+    try {
+      window.localStorage.removeItem(getStorageKey(table));
+    } catch (error) {
+      // Storage can be unavailable in privacy-restricted browser contexts.
+    }
+    applyWidths(table, widths, minWidth);
+  };
+
+  const resizeColumn = (table, index, delta, persist) => {
+    const widths = [...table._largeTableColumnWidths];
+    const minWidth = getMinWidth(table);
+    const nextLeft = Math.max(minWidth, Math.min(widths[index] + widths[index + 1] - minWidth, widths[index] + delta));
+    const appliedDelta = nextLeft - widths[index];
+    widths[index] = nextLeft;
+    widths[index + 1] -= appliedDelta;
+    applyWidths(table, widths, minWidth);
+    if (persist) {
+      writeStoredWidths(table, widths);
+    }
+  };
+
+  const initTable = (table) => {
+    const headers = getColumnHeaders(table);
+    if (headers.length < 2) {
+      return;
+    }
+    const minWidth = getMinWidth(table);
+    const stored = readStoredWidths(table, headers.length, minWidth);
+    applyWidths(table, stored || getDefaultWidths(table, headers, minWidth), minWidth);
+
+    if (table.dataset.largeTableResizeInitialized === 'true') {
+      return;
+    }
+    table.dataset.largeTableResizeInitialized = 'true';
+
+    table.addEventListener('pointerdown', (event) => {
+      const handle = event.target.closest('[data-large-table-resize-handle]');
+      if (!handle || !table.contains(handle)) {
+        return;
+      }
+      event.preventDefault();
+      activeResize = {
+        table,
+        handle,
+        index: Number.parseInt(handle.dataset.largeTableResizeHandle, 10),
+        startX: event.clientX,
+        startWidths: [...table._largeTableColumnWidths],
+      };
+      handle.dataset.largeTableResizeActive = 'true';
+      table.dataset.columnResizeState = 'resizing';
+      handle.setPointerCapture?.(event.pointerId);
+    });
+
+    table.addEventListener('pointermove', (event) => {
+      if (!activeResize || activeResize.table !== table) {
+        return;
+      }
+      applyWidths(table, activeResize.startWidths, getMinWidth(table));
+      resizeColumn(table, activeResize.index, event.clientX - activeResize.startX, false);
+    });
+
+    table.addEventListener('pointerup', () => {
+      if (!activeResize || activeResize.table !== table) {
+        return;
+      }
+      writeStoredWidths(table, table._largeTableColumnWidths);
+      activeResize.handle.dataset.largeTableResizeActive = 'false';
+      table.dataset.columnResizeState = 'idle';
+      activeResize = null;
+    });
+
+    table.addEventListener('keydown', (event) => {
+      const handle = event.target.closest('[data-large-table-resize-handle]');
+      if (!handle || !table.contains(handle)) {
+        return;
+      }
+      const index = Number.parseInt(handle.dataset.largeTableResizeHandle, 10);
+      const step = event.shiftKey ? KEYBOARD_LARGE_STEP : KEYBOARD_STEP;
+      if (event.key === 'ArrowLeft' || event.key === 'ArrowRight') {
+        event.preventDefault();
+        resizeColumn(table, index, event.key === 'ArrowRight' ? step : -step, true);
+      } else if (event.key === 'Home' || event.key === 'End') {
+        event.preventDefault();
+        const minWidth = getMinWidth(table);
+        const current = table._largeTableColumnWidths[index];
+        const target = event.key === 'Home' ? minWidth : current + table._largeTableColumnWidths[index + 1] - minWidth;
+        resizeColumn(table, index, target - current, true);
+      }
+    });
+
+    table.addEventListener('click', (event) => {
+      const reset = event.target.closest('[data-large-table-reset-widths]');
+      if (reset && table.contains(reset)) {
+        resetWidths(table);
+      }
+    });
+  };
+
+  window.sgInitLargeTableColumnResize = (options = {}) => {
+    const root = options.root || document;
+    getTables(root).forEach(initTable);
+  };
+
+  document.addEventListener('DOMContentLoaded', () => window.sgInitLargeTableColumnResize(), { once: true });
+})();