Improve foundation pile design when empty

qml/FoundationPiles.qml

@@ -7,11 +7,44 @@ Row {
     Repeater {
         model: 4 // Each of the 4 suits
 
-        CardModel {
+        Item {
+            id: foundationPile
+            width: foundationCard.width
+            height: foundationCard.height
+
             required property int index // passed from repeater
 
-            card: GameState.foundation[index].length > 0 ? GameState.foundation[index][0] : null
-            isFaceDown: false
+            CardModel {
+                id: foundationCard
+
+                anchors.fill: parent
+                visible: GameState.foundation[parent.index].length > 0
+
+                card: GameState.foundation[parent.index].length > 0 ? GameState.foundation[parent.index][0] : null
+                isFaceDown: false
+            }
+
+            Rectangle {
+                id: emptyPileRect
+
+                anchors.fill: parent
+                visible: GameState.foundation[parent.index].length === 0
+
+                color: "gray"
+                border.color: "white"
+                border.width: 3
+                opacity: 0.4
+                radius: 10
+
+                Text {
+                    text: "A"
+                    color: "white"
+                    font.pixelSize: 40
+                    font.bold: true
+
+                    anchors.centerIn: parent
+                }
+            }
         }
     }
 }