diff --git a/app.py b/app.py
index 5acb1e0..18b26f4 100644
--- a/app.py
+++ b/app.py
@@ -933,7 +933,8 @@ body{background:var(--bg);color:var(--txt);font-family:-apple-system,BlinkMacSys
 .flash.ok{color:var(--grn)}.flash.err{color:var(--red)}
 
 /* ── Port Slots ── */
-.port-pair{display:grid;grid-template-columns:1fr 1fr;gap:.85rem}
+/* port-pair: immer echtes 1fr 1fr, unabhängig vom Explorer */
+.port-pair{display:grid;grid-template-columns:1fr 1fr;gap:.85rem;align-items:start}
 @media(max-width:500px){.port-pair{grid-template-columns:1fr}}
 .port-slot{border:1.5px solid var(--brd);border-radius:var(--r);padding:.85rem;transition:border-color .2s}
 .port-slot.src-on{border-color:var(--grn2)}
@@ -950,12 +951,10 @@ body{background:var(--bg);color:var(--txt);font-family:-apple-system,BlinkMacSys
 .hint-box{font-size:.72rem;color:var(--sub);margin-top:.65rem;padding:.45rem .65rem;background:var(--bg2);border-radius:.4rem;border-left:3px solid var(--brd2);line-height:1.5}
 
 /* ── Port+Explorer grid ── */
-.pex-grid{display:grid;gap:.85rem;grid-template-columns:1fr 1fr}
-@media(max-width:599px){.pex-grid{grid-template-columns:1fr}}
-@media(min-width:960px){.pex-grid{grid-template-columns:1fr 1fr 1.35fr}}
+/* pex-grid: port-pair links, explorer rechts */
+.pex-grid{display:grid;gap:.85rem;grid-template-columns:1fr}
+@media(min-width:960px){.pex-grid{grid-template-columns:1fr auto}.pex-grid .expl-wrap{width:320px}}
 .expl-wrap{border:1px solid var(--brd);border-radius:var(--r);overflow:hidden;display:flex;flex-direction:column}
-@media(max-width:959px){.expl-wrap{grid-column:1/-1}}
-@media(min-width:960px){.expl-wrap{grid-row:1}}
 
 /* ── File Explorer ── */
 .expl-bar{display:flex;align-items:center;gap:.4rem;padding:.55rem .8rem;background:var(--surf2);border-bottom:1px solid var(--brd);flex-shrink:0}
@@ -1083,6 +1082,9 @@ body{background:var(--bg);color:var(--txt);font-family:-apple-system,BlinkMacSys
   <div class="card-body">
     <div class="pex-grid">
 
+      <!-- Quelle + Ziel in eigenem gleichbreiten Grid -->
+      <div class="port-pair">
+
       <!-- Quelle -->
       <div class="port-slot" id="slot-src">
         <div class="role-tag src">▲ Quelle</div>
@@ -1133,6 +1135,8 @@ body{background:var(--bg);color:var(--txt);font-family:-apple-system,BlinkMacSys
         <div class="hint-box">Gerät in den gewünschten Port → aus Liste wählen → Speichern. Ab dann wird dieser Port immer als Ziel verwendet.</div>
       </div>
 
+      </div><!-- /port-pair -->
+
       <!-- File Explorer -->
       <div class="expl-wrap">
         <div class="expl-bar">