diff --git a/src/main/frontend/node-editor/node-editor.js b/src/main/frontend/node-editor/node-editor.js
index 631cfe7..ab17f33 100644
--- a/src/main/frontend/node-editor/node-editor.js
+++ b/src/main/frontend/node-editor/node-editor.js
@@ -5,7 +5,7 @@ import 'drawflow/dist/drawflow.min.css';
 // senkrecht in den Eingang des Ziels eintritt, bevor sie abbiegt.
 const EXIT_STUB = 5;
 
-function customCurvature(sx, sy, ex, ey) {
+function verticalCurvature(sx, sy, ex, ey) {
     const dx = ex - sx;
     const minOffset = 40;
 
@@ -31,8 +31,147 @@ function customCurvature(sx, sy, ex, ey) {
     return ` M ${sx} ${sy} L ${sx} ${sy2} C ${c1x} ${c1y} ${c2x} ${c2y} ${ex} ${ey2} L ${ex} ${ey}`;
 }
 
+// --- Hindernis-bewusste Linienführung -------------------------------------
+// Ports liegen oben (Eingang) und unten (Ausgang). Damit Linien nach
+// Möglichkeit nicht über andere Kacheln (oder bei Rückwärtskanten über Quell-/
+// Zielkachel) laufen, werden kreuzende Verbindungen seitlich an den Kacheln
+// vorbei über eine freie Spalte umgeleitet.
+const ROUTE_STUB = 16;    // senkrechte Aus-/Eintrittsstrecke an den Ports
+const ROUTE_PAD = 18;     // Sicherheitsabstand um jede Kachel
+const ROUTE_RADIUS = 14;  // Eckenradius der Umleitung
+
+// Alle Knoten-Rechtecke (Canvas-Koordinaten, inkl. Sicherheitsabstand).
+function nodeRects(state) {
+    const rects = [];
+    state.container.querySelectorAll('.drawflow-node').forEach(el => {
+        const left = parseFloat(el.style.left) || 0;
+        const top = parseFloat(el.style.top) || 0;
+        const w = el.offsetWidth || 0;
+        const h = el.offsetHeight || 0;
+        if (!w || !h) return;
+        rects.push({
+            left: left - ROUTE_PAD, top: top - ROUTE_PAD,
+            right: left + w + ROUTE_PAD, bottom: top + h + ROUTE_PAD
+        });
+    });
+    return rects;
+}
+
+// Rechtecke ohne die Quell-/Zielkachel (die die Endpunkte enthalten).
+function withoutEndpointRects(rects, sx, sy, ex, ey) {
+    return rects.filter(r => {
+        const hasStart = sx >= r.left && sx <= r.right && sy >= r.top && sy <= r.bottom;
+        const hasEnd = ex >= r.left && ex <= r.right && ey >= r.top && ey <= r.bottom;
+        return !hasStart && !hasEnd;
+    });
+}
+
+function pointInAnyRect(x, y, rects) {
+    return rects.some(r => x >= r.left && x <= r.right && y >= r.top && y <= r.bottom);
+}
+
+// Tastet einen beliebigen SVG-Pfad ab und prüft, ob er über eine Kachel läuft.
+function pathHits(d, rects) {
+    if (!rects.length) return false;
+    const p = document.createElementNS('http://www.w3.org/2000/svg', 'path');
+    p.setAttribute('d', d);
+    let total = 0;
+    try { total = p.getTotalLength(); } catch (e) { return false; }
+    if (!total) return false;
+    const steps = Math.max(16, Math.min(120, Math.round(total / 10)));
+    for (let i = 1; i < steps; i++) {
+        const pt = p.getPointAtLength((i / steps) * total);
+        if (pointInAnyRect(pt.x, pt.y, rects)) return true;
+    }
+    return false;
+}
+
+// Treffer-Test für achsenparallele Wegpunkte (Segment-BBox == Segment).
+function segmentsHit(points, rects) {
+    for (let i = 0; i < points.length - 1; i++) {
+        const a = points[i], b = points[i + 1];
+        const left = Math.min(a.x, b.x), right = Math.max(a.x, b.x);
+        const top = Math.min(a.y, b.y), bottom = Math.max(a.y, b.y);
+        if (rects.some(r => right >= r.left && left <= r.right && bottom >= r.top && top <= r.bottom)) {
+            return true;
+        }
+    }
+    return false;
+}
+
+// Wegpunkte: aus dem Ausgang nach unten, über eine freie Spalte (channelX)
+// und von oben in den Eingang.
+function channelWaypoints(sx, sy, ex, ey, channelX) {
+    const ay = sy + ROUTE_STUB;
+    const by = ey - ROUTE_STUB;
+    return [
+        { x: sx, y: sy }, { x: sx, y: ay }, { x: channelX, y: ay },
+        { x: channelX, y: by }, { x: ex, y: by }, { x: ex, y: ey }
+    ];
+}
+
+// Glatter Pfad mit abgerundeten Ecken durch achsenparallele Wegpunkte.
+function roundedPath(pts, radius) {
+    const points = [];
+    for (const p of pts) {
+        const last = points[points.length - 1];
+        if (!last || Math.abs(last.x - p.x) > 0.5 || Math.abs(last.y - p.y) > 0.5) points.push(p);
+    }
+    if (points.length < 2) return '';
+    if (points.length === 2) {
+        return `M ${points[0].x} ${points[0].y} L ${points[1].x} ${points[1].y}`;
+    }
+    let d = `M ${points[0].x} ${points[0].y}`;
+    for (let i = 1; i < points.length - 1; i++) {
+        const p0 = points[i - 1], p1 = points[i], p2 = points[i + 1];
+        const v1x = p1.x - p0.x, v1y = p1.y - p0.y;
+        const v2x = p2.x - p1.x, v2y = p2.y - p1.y;
+        const len1 = Math.hypot(v1x, v1y) || 1;
+        const len2 = Math.hypot(v2x, v2y) || 1;
+        const rr = Math.min(radius, len1 / 2, len2 / 2);
+        const s1x = p1.x - (v1x / len1) * rr, s1y = p1.y - (v1y / len1) * rr;
+        const e1x = p1.x + (v2x / len2) * rr, e1y = p1.y + (v2y / len2) * rr;
+        d += ` L ${s1x} ${s1y} Q ${p1.x} ${p1.y} ${e1x} ${e1y}`;
+    }
+    const last = points[points.length - 1];
+    d += ` L ${last.x} ${last.y}`;
+    return d;
+}
+
+// Liefert den SVG-Pfad einer Verbindung – direkt, falls frei, sonst umgeleitet.
+function routeConnection(state, sx, sy, ex, ey) {
+    const direct = verticalCurvature(sx, sy, ex, ey);
+    const all = nodeRects(state);
+    const others = withoutEndpointRects(all, sx, sy, ex, ey);
+
+    // Klare Vorwärtskante ohne fremde Kachel im Weg -> bisherige Kurve behalten.
+    const isBackward = ey < sy + 2 * ROUTE_STUB;
+    if (!isBackward && !pathHits(direct, others)) return direct;
+
+    // Bei Rückwärtskanten auch um Quell-/Zielkachel herum, bei Vorwärtskanten
+    // nur um fremde Kacheln.
+    const candidates = isBackward ? all : others;
+    const spanTop = Math.min(sy, ey) - ROUTE_STUB;
+    const spanBottom = Math.max(sy, ey) + ROUTE_STUB;
+    const blockers = candidates.filter(r => r.bottom > spanTop && r.top < spanBottom);
+    if (!blockers.length) return direct;
+
+    const ref = (sx + ex) / 2;
+    const leftX = Math.min(...blockers.map(r => r.left)) - ROUTE_PAD;
+    const rightX = Math.max(...blockers.map(r => r.right)) + ROUTE_PAD;
+    const first = Math.abs(leftX - ref) <= Math.abs(rightX - ref) ? leftX : rightX;
+    const second = first === leftX ? rightX : leftX;
+
+    let wp = channelWaypoints(sx, sy, ex, ey, first);
+    if (segmentsHit(wp, others)) {
+        const alt = channelWaypoints(sx, sy, ex, ey, second);
+        if (!segmentsHit(alt, others)) wp = alt;
+    }
+    return roundedPath(wp, ROUTE_RADIUS);
+}
+
 if (Drawflow && Drawflow.prototype) {
-    Drawflow.prototype.createCurvature = customCurvature;
+    Drawflow.prototype.createCurvature = verticalCurvature;
 }
 
 const editors = new WeakMap();
@@ -82,7 +221,6 @@ function attach(host) {
     editor.reroute = true;
     editor.reroute_fix_curvature = true;
     editor.curvature = 0.5;
-    editor.createCurvature = customCurvature;
     editor.start();
 
     const state = {
@@ -92,6 +230,13 @@ function attach(host) {
     };
     editors.set(host, state);
 
+    // Hindernis-bewusste Linienführung. Reroute-Teilsegmente
+    // (type != 'openclose') nutzen die einfache vertikale Kurve.
+    editor.createCurvature = (sx, sy, ex, ey, curvature, type) =>
+        (type && type !== 'openclose')
+            ? verticalCurvature(sx, sy, ex, ey)
+            : routeConnection(state, sx, sy, ex, ey);
+
     container.addEventListener('dragover', e => {
         e.preventDefault();
         e.dataTransfer.dropEffect = 'copy';
diff --git a/src/main/frontend/node-editor/script-editor.js b/src/main/frontend/node-editor/script-editor.js
index 53774de..89ce244 100644
--- a/src/main/frontend/node-editor/script-editor.js
+++ b/src/main/frontend/node-editor/script-editor.js
@@ -30,6 +30,136 @@ function horizontalCurvature(sx, sy, ex, ey) {
     return ` M ${sx} ${sy} C ${sx + offset} ${sy} ${ex - offset} ${ey} ${ex} ${ey}`;
 }
 
+// --- Hindernis-bewusste Linienführung -------------------------------------
+// createCurvature kennt nur die Endpunkte der Verbindung. Damit Linien nach
+// Möglichkeit nicht über andere Kacheln laufen, lesen wir die Knoten-Rechtecke
+// (in Canvas-Koordinaten) direkt aus dem DOM und leiten eine kreuzende Linie
+// über einen freien horizontalen Kanal ober- oder unterhalb der Kacheln um.
+
+const ROUTE_STUB = 26;    // waagerechte Aus-/Eintrittsstrecke an den Ports
+const ROUTE_PAD = 14;     // Sicherheitsabstand um jede Kachel
+const ROUTE_RADIUS = 12;  // Eckenradius der Umleitung
+
+// Knoten-Rechtecke als Hindernisse; Quell-/Zielknoten (die die Endpunkte
+// enthalten) werden ausgeschlossen.
+function obstacleRects(state, sx, sy, ex, ey) {
+    const rects = [];
+    state.container.querySelectorAll('.drawflow-node').forEach(el => {
+        const left = parseFloat(el.style.left) || 0;
+        const top = parseFloat(el.style.top) || 0;
+        const w = el.offsetWidth || 0;
+        const h = el.offsetHeight || 0;
+        if (!w || !h) return;
+        const r = {
+            left: left - ROUTE_PAD, top: top - ROUTE_PAD,
+            right: left + w + ROUTE_PAD, bottom: top + h + ROUTE_PAD
+        };
+        const hasStart = sx >= r.left && sx <= r.right && sy >= r.top && sy <= r.bottom;
+        const hasEnd = ex >= r.left && ex <= r.right && ey >= r.top && ey <= r.bottom;
+        if (hasStart || hasEnd) return;
+        rects.push(r);
+    });
+    return rects;
+}
+
+function pointInAnyRect(x, y, rects) {
+    return rects.some(r => x >= r.left && x <= r.right && y >= r.top && y <= r.bottom);
+}
+
+// Läuft die (abgetastete) Bézier-Kurve über eine Kachel?
+function bezierHits(sx, sy, c1x, c1y, c2x, c2y, ex, ey, rects) {
+    const N = 24;
+    for (let i = 1; i < N; i++) {
+        const t = i / N, u = 1 - t;
+        const x = u * u * u * sx + 3 * u * u * t * c1x + 3 * u * t * t * c2x + t * t * t * ex;
+        const y = u * u * u * sy + 3 * u * u * t * c1y + 3 * u * t * t * c2y + t * t * t * ey;
+        if (pointInAnyRect(x, y, rects)) return true;
+    }
+    return false;
+}
+
+// Treffer-Test für eine achsenparallele Wegpunktkette (Segment-BBox == Segment).
+function segmentsHit(points, rects) {
+    for (let i = 0; i < points.length - 1; i++) {
+        const a = points[i], b = points[i + 1];
+        const left = Math.min(a.x, b.x), right = Math.max(a.x, b.x);
+        const top = Math.min(a.y, b.y), bottom = Math.max(a.y, b.y);
+        if (rects.some(r => right >= r.left && left <= r.right && bottom >= r.top && top <= r.bottom)) {
+            return true;
+        }
+    }
+    return false;
+}
+
+// Wegpunkte: Aus dem Port heraus, über einen Kanal auf Höhe channelY und in
+// den Zielport hinein.
+function channelWaypoints(sx, sy, ex, ey, channelY) {
+    const ax = sx + ROUTE_STUB;
+    const bx = ex - ROUTE_STUB;
+    return [
+        { x: sx, y: sy }, { x: ax, y: sy }, { x: ax, y: channelY },
+        { x: bx, y: channelY }, { x: bx, y: ey }, { x: ex, y: ey }
+    ];
+}
+
+// Glatter Pfad mit abgerundeten Ecken durch achsenparallele Wegpunkte.
+function roundedPath(pts, radius) {
+    const points = [];
+    for (const p of pts) {
+        const last = points[points.length - 1];
+        if (!last || Math.abs(last.x - p.x) > 0.5 || Math.abs(last.y - p.y) > 0.5) points.push(p);
+    }
+    if (points.length < 2) return '';
+    if (points.length === 2) {
+        return `M ${points[0].x} ${points[0].y} L ${points[1].x} ${points[1].y}`;
+    }
+    let d = `M ${points[0].x} ${points[0].y}`;
+    for (let i = 1; i < points.length - 1; i++) {
+        const p0 = points[i - 1], p1 = points[i], p2 = points[i + 1];
+        const v1x = p1.x - p0.x, v1y = p1.y - p0.y;
+        const v2x = p2.x - p1.x, v2y = p2.y - p1.y;
+        const len1 = Math.hypot(v1x, v1y) || 1;
+        const len2 = Math.hypot(v2x, v2y) || 1;
+        const rr = Math.min(radius, len1 / 2, len2 / 2);
+        const s1x = p1.x - (v1x / len1) * rr, s1y = p1.y - (v1y / len1) * rr;
+        const e1x = p1.x + (v2x / len2) * rr, e1y = p1.y + (v2y / len2) * rr;
+        d += ` L ${s1x} ${s1y} Q ${p1.x} ${p1.y} ${e1x} ${e1y}`;
+    }
+    const last = points[points.length - 1];
+    d += ` L ${last.x} ${last.y}`;
+    return d;
+}
+
+// Liefert den SVG-Pfad einer Verbindung – direkt, falls frei, sonst umgeleitet.
+function routeConnection(state, sx, sy, ex, ey) {
+    const offset = Math.max(Math.abs(ex - sx) * 0.5, 40);
+    const c1x = sx + offset, c2x = ex - offset;
+    const direct = ` M ${sx} ${sy} C ${c1x} ${sy} ${c2x} ${ey} ${ex} ${ey}`;
+
+    const rects = obstacleRects(state, sx, sy, ex, ey);
+    if (rects.length === 0 || !bezierHits(sx, sy, c1x, sy, c2x, ey, ex, ey, rects)) {
+        return direct;
+    }
+
+    // Kacheln, die im waagerechten Bereich zwischen Quelle und Ziel liegen.
+    const spanLeft = Math.min(sx, ex), spanRight = Math.max(sx, ex);
+    const blockers = rects.filter(r => r.right > spanLeft && r.left < spanRight);
+    if (blockers.length === 0) return direct;
+
+    const ref = (sy + ey) / 2;
+    const aboveY = Math.min(...blockers.map(r => r.top)) - ROUTE_PAD;
+    const belowY = Math.max(...blockers.map(r => r.bottom)) + ROUTE_PAD;
+    const first = Math.abs(aboveY - ref) <= Math.abs(belowY - ref) ? aboveY : belowY;
+    const second = first === aboveY ? belowY : aboveY;
+
+    let wp = channelWaypoints(sx, sy, ex, ey, first);
+    if (segmentsHit(wp, rects)) {
+        const alt = channelWaypoints(sx, sy, ex, ey, second);
+        if (!segmentsHit(alt, rects)) wp = alt;
+    }
+    return roundedPath(wp, ROUTE_RADIUS);
+}
+
 // Drag-Start für die Operator-Kacheln (einmalig global registrieren).
 if (!window.__scriptEditorDragInit) {
     window.__scriptEditorDragInit = true;
@@ -218,13 +348,19 @@ function attach(host) {
 
     const editor = new Drawflow(container);
     editor.reroute = true;
-    // Eigene horizontale Kurvenführung (überschreibt die vertikale aus dem Workflow-Editor).
-    editor.createCurvature = horizontalCurvature;
     editor.start();
 
     const state = { editor, container, counter: 0, variables: [] };
     scriptEditors.set(host, state);
 
+    // Hindernis-bewusste, horizontale Linienführung (statt der vertikalen aus
+    // dem Workflow-Editor). Für Verbindungssegmente mit Reroute-Punkten
+    // (type != 'openclose') greift die einfache Kurve.
+    editor.createCurvature = (sx, sy, ex, ey, curvature, type) =>
+        (type && type !== 'openclose')
+            ? horizontalCurvature(sx, sy, ex, ey)
+            : routeConnection(state, sx, sy, ex, ey);
+
     container.addEventListener('dragover', e => {
         e.preventDefault();
         if (e.dataTransfer) e.dataTransfer.dropEffect = 'copy';