diff --git a/VERSION b/VERSION
new file mode 100644
index 0000000..b2580f2
--- /dev/null
+++ b/VERSION
@@ -0,0 +1 @@
+2026.05.18.1
diff --git a/docs/portal_sync_flow.md b/docs/portal_sync_flow.md
new file mode 100644
index 0000000..99f2d43
--- /dev/null
+++ b/docs/portal_sync_flow.md
@@ -0,0 +1,34 @@
+# Portal Sync Flow
+
+## Ziel
+
+Der Styleguide bleibt in diesem Repository die Source of Truth. Das Portal holt den Stand versioniert als `public/assets/styleguide.upstream.css`.
+
+## Vorbereitung
+
+- Version in `VERSION` erhoehen, sobald ein freigegebener Stand vorliegt.
+- Aenderungen im Styleguide committen und pushen.
+
+## Sync ausfuehren
+
+Beispiel:
+
+```bash
+./scripts/sync_styleguide_to_portal.sh \
+  --portal-repo "/Users/mathias/Documents/Dokumente Chouchou/Codebases/WebApp_Aktienberater" \
+  --commit-portal
+```
+
+## Ergebnis im Portalrepo
+
+- `public/assets/styleguide.upstream.css` aktualisiert
+- `public/assets/styleguide.upstream.meta.json` aktualisiert (Version, Commit, Zeitstempel)
+- Optional: automatischer Commit + Push im Portalrepo
+
+## Standardprozess je Release
+
+1. Styleguide aendern
+2. `VERSION` erhoehen
+3. Styleguide commit + push
+4. Sync-Skript ausfuehren
+5. Portal Smoke-Test
diff --git a/scripts/sync_styleguide_to_portal.sh b/scripts/sync_styleguide_to_portal.sh
new file mode 100755
index 0000000..a37f4d5
--- /dev/null
+++ b/scripts/sync_styleguide_to_portal.sh
@@ -0,0 +1,103 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+STYLEGUIDE_REPO_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
+SOURCE_CSS="$STYLEGUIDE_REPO_ROOT/styleguide.css"
+VERSION_FILE="$STYLEGUIDE_REPO_ROOT/VERSION"
+
+PORTAL_REPO_PATH=""
+PORTAL_CSS_REL="public/assets/styleguide.upstream.css"
+PORTAL_META_REL="public/assets/styleguide.upstream.meta.json"
+COMMIT_IN_PORTAL="false"
+
+usage() {
+  cat <<USAGE
+Usage:
+  $(basename "$0") --portal-repo <path> [--commit-portal]
+
+Options:
+  --portal-repo <path>   Absolute path to portal repository root.
+  --commit-portal        Create commit in portal repo after sync.
+  -h, --help             Show this help.
+USAGE
+}
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --portal-repo)
+      PORTAL_REPO_PATH="${2:-}"
+      shift 2
+      ;;
+    --commit-portal)
+      COMMIT_IN_PORTAL="true"
+      shift
+      ;;
+    -h|--help)
+      usage
+      exit 0
+      ;;
+    *)
+      echo "Unknown argument: $1" >&2
+      usage
+      exit 1
+      ;;
+  esac
+done
+
+if [[ -z "$PORTAL_REPO_PATH" ]]; then
+  echo "Missing required argument: --portal-repo" >&2
+  usage
+  exit 1
+fi
+
+if [[ ! -f "$SOURCE_CSS" ]]; then
+  echo "Source CSS not found: $SOURCE_CSS" >&2
+  exit 1
+fi
+
+if [[ ! -f "$VERSION_FILE" ]]; then
+  echo "Version file not found: $VERSION_FILE" >&2
+  exit 1
+fi
+
+if [[ ! -d "$PORTAL_REPO_PATH/.git" ]]; then
+  echo "Portal repo is not a git repository: $PORTAL_REPO_PATH" >&2
+  exit 1
+fi
+
+PORTAL_CSS_PATH="$PORTAL_REPO_PATH/$PORTAL_CSS_REL"
+PORTAL_META_PATH="$PORTAL_REPO_PATH/$PORTAL_META_REL"
+
+mkdir -p "$(dirname "$PORTAL_CSS_PATH")"
+
+cp "$SOURCE_CSS" "$PORTAL_CSS_PATH"
+
+STYLEGUIDE_VERSION="$(tr -d '[:space:]' < "$VERSION_FILE")"
+STYLEGUIDE_COMMIT="$(git -C "$STYLEGUIDE_REPO_ROOT" rev-parse --short HEAD)"
+SYNCED_AT="$(date -u +"%Y-%m-%dT%H:%M:%SZ")"
+
+cat > "$PORTAL_META_PATH" <<META
+{
+  "styleguideVersion": "$STYLEGUIDE_VERSION",
+  "styleguideCommit": "$STYLEGUIDE_COMMIT",
+  "syncedAtUtc": "$SYNCED_AT",
+  "sourceRepo": "$STYLEGUIDE_REPO_ROOT"
+}
+META
+
+if [[ "$COMMIT_IN_PORTAL" == "true" ]]; then
+  git -C "$PORTAL_REPO_PATH" add "$PORTAL_CSS_REL" "$PORTAL_META_REL"
+  if ! git -C "$PORTAL_REPO_PATH" diff --cached --quiet; then
+    git -C "$PORTAL_REPO_PATH" commit -m "Sync styleguide $STYLEGUIDE_VERSION"
+    git -C "$PORTAL_REPO_PATH" push
+    echo "Portal repo synced and pushed."
+  else
+    echo "No changes to commit in portal repo."
+  fi
+else
+  echo "Portal files updated locally (no commit requested)."
+fi
+
+echo "Synced $SOURCE_CSS -> $PORTAL_CSS_PATH"
+echo "Metadata written: $PORTAL_META_PATH"