diff --git a/src/components/buyer-tasks/buyer-task-group-card.tsx b/src/components/buyer-tasks/buyer-task-group-card.tsx
index 81a23b8..9d72504 100644
--- a/src/components/buyer-tasks/buyer-task-group-card.tsx
+++ b/src/components/buyer-tasks/buyer-task-group-card.tsx
@@ -67,17 +67,25 @@ export function BuyerTaskGroupCard({
       />
 
       <CardContent className="p-0 pl-3">
-        <div className="flex items-start gap-3 p-3">
+        {/* On mobile the action column drops below the info column so
+            neither gets crushed — the PO number badge no longer wraps
+            mid-number and the buttons get full-width tap targets. On
+            `sm:` and up the original side-by-side layout returns. */}
+        <div className="flex flex-col sm:flex-row sm:items-start gap-3 p-3">
           <div className="min-w-0 flex-1 space-y-1.5">
             {/* PO number + order number on the top row so they're
                 both scannable. The PO number is the headline — the
                 thing the operator needs to find quickly — so it goes
                 first and gets its own visual weight. Only shown when
-                a PO has been generated (po_draft / po_sent tabs). */}
+                a PO has been generated (po_draft / po_sent tabs). The
+                badge uses `whitespace-nowrap` so a long PO number
+                (`PO-26071401`) never breaks mid-string when the info
+                column gets narrow — the parent `flex-wrap` carries
+                it onto the next line as a whole. */}
             <div className="flex items-baseline gap-2 flex-wrap">
               {group.poNumber && (
                 <span
-                  className="inline-flex items-center gap-1 rounded-md border border-warn/40 bg-warn px-2 py-0.5 font-mono text-xs font-bold text-warn-foreground ring-1 ring-inset ring-warn/20 dark:bg-warn/20 dark:border-warn/30 dark:text-warn dark:ring-warn/20"
+                  className="inline-flex items-center gap-1 whitespace-nowrap rounded-md border border-warn/40 bg-warn px-2 py-0.5 font-mono text-xs font-bold text-warn-foreground ring-1 ring-inset ring-warn/20 dark:bg-warn/20 dark:border-warn/30 dark:text-warn dark:ring-warn/20"
                   data-testid={`buyer-task-po-number-${group.groupId}`}
                 >
                   <FileText className="h-3 w-3" />
@@ -88,7 +96,7 @@ export function BuyerTaskGroupCard({
                 {group.orderNumber}
               </span>
               <span
-                className="text-sm font-semibold"
+                className="min-w-0 text-sm font-semibold"
                 // Tint the supplier name with the same colour as the
                 // stripe so the supplier is recognisable even when the
                 // card content overlaps with neighbours.
@@ -117,13 +125,20 @@ export function BuyerTaskGroupCard({
             // recorded `sentAt` (legacy rows predating email_payload,
             // or a fresh po_draft that got flipped straight to
             // po_sent without a successful send).
-            <div className="flex flex-col items-end gap-1">
-              <div className="flex items-center gap-2">
+            //
+            // Mobile (below `sm:`): the buttons stack vertically and
+            // stretch to the full card width so the tap target is easy
+            // to hit; the caption aligns left to sit under the buttons
+            // naturally. On `sm:` and up the original side-by-side
+            // button row + right-aligned caption returns.
+            <div className="flex flex-col items-stretch sm:items-end gap-2">
+              <div className="flex flex-col sm:flex-row gap-2">
                 <Button
                   type="button"
                   onClick={() => onResend?.(group)}
                   disabled={disabled || !onResend}
                   className={cn(
+                    "flex-1 sm:flex-none",
                     RESEND_DEFAULT_CLASS,
                     group.poStatus === "mail_failed" && RESEND_FAILED_CLASS,
                   )}
@@ -136,7 +151,10 @@ export function BuyerTaskGroupCard({
                   type="button"
                   onClick={() => onAction(group)}
                   disabled={disabled}
-                  className={ACTION_CLASS[group.step]}
+                  className={cn(
+                    "flex-1 sm:flex-none",
+                    ACTION_CLASS[group.step],
+                  )}
                   data-testid={`buyer-task-action-${group.groupId}-${group.step}`}
                 >
                   {ACTION_LABEL[group.step]}
@@ -144,7 +162,7 @@ export function BuyerTaskGroupCard({
               </div>
               {group.emailPayload?.sentAt ? (
                 <div
-                  className="text-xs text-muted-foreground text-right leading-tight"
+                  className="text-xs text-muted-foreground text-left sm:text-right leading-tight"
                   data-testid={`buyer-task-sent-info-${group.groupId}`}
                 >
                   {group.emailPayload.to ? (
@@ -169,12 +187,16 @@ export function BuyerTaskGroupCard({
               ) : null}
             </div>
           ) : (
-            // needs_po / po_draft: single button (unchanged behaviour).
+            // needs_po / po_draft: single button. On mobile the button
+            // stretches full-width below the info column (better tap
+            // target, gives the info column all the available width);
+            // on `sm:` it sits inline to the right of the info.
             <Button
               type="button"
               onClick={() => onAction(group)}
               disabled={disabled}
               className={cn(
+                "sm:self-auto self-stretch",
                 ACTION_CLASS[group.step],
                 group.poStatus === "mail_failed" &&
                   "bg-destructive hover:bg-destructive/90 text-destructive-foreground",