diff --git a/modules/NotifCard.qml b/modules/NotifCard.qml
index bd19ee0..fa4b8da 100644
--- a/modules/NotifCard.qml
+++ b/modules/NotifCard.qml
@@ -28,7 +28,7 @@ Item {
     Rectangle {
         anchors.fill: parent
         color: _hover.hovered ? M.Theme.base02 : M.Theme.base01
-        opacity: Math.max(M.Theme.barOpacity, 0.9)
+        opacity: _hover.hovered ? 1.0 : Math.max(M.Theme.barOpacity, 0.9)
         radius: M.Theme.radius
 
         Behavior on color {
diff --git a/modules/NotifCenter.qml b/modules/NotifCenter.qml
index ee07ebf..8b54608 100644
--- a/modules/NotifCenter.qml
+++ b/modules/NotifCenter.qml
@@ -67,6 +67,18 @@ M.HoverPanel {
 
     property var _pendingDismissIds: []
 
+    // Collapsed groups set — reassign to trigger reactivity
+    property var _collapsedGroups: ({})
+
+    function _toggleCollapse(appName) {
+        const next = Object.assign({}, _collapsedGroups);
+        if (next[appName])
+            delete next[appName];
+        else
+            next[appName] = true;
+        _collapsedGroups = next;
+    }
+
     // Group notifications by appName, sorted by max urgency desc then most recent time desc
     readonly property var _groups: {
         const map = {};
@@ -93,21 +105,26 @@ M.HoverPanel {
         });
     }
 
-    // Flat model: group header followed by its notifications
+    // Flat model: group header followed by its notifications (omitted when collapsed)
     readonly property var _flatModel: {
         const arr = [];
         for (const g of _groups) {
+            const collapsed = !!_collapsedGroups[g.appName];
             arr.push({
                 type: "header",
                 appName: g.appName,
                 appIcon: g.appIcon,
-                count: g.notifs.length
+                count: g.notifs.length,
+                collapsed: collapsed,
+                summaries: g.notifs.map(n => n.summary || "").filter(Boolean).join("  ·  ")
             });
-            for (const n of g.notifs)
-                arr.push({
-                    type: "notif",
-                    data: n
-                });
+            if (!collapsed) {
+                for (const n of g.notifs)
+                    arr.push({
+                        type: "notif",
+                        data: n
+                    });
+            }
         }
         return arr;
     }
@@ -218,11 +235,25 @@ M.HoverPanel {
             readonly property var _notif: _type === "notif" ? modelData.data : null
 
             width: menuWindow.contentWidth
-            height: _targetHeight * _heightScale
+            height: _displayTargetHeight * _heightScale
             clip: true
             opacity: 0
 
-            readonly property real _targetHeight: _type === "header" ? 28 : _notifCard.implicitHeight
+            readonly property real _targetHeight: {
+                if (_type === "header")
+                    return modelData.collapsed ? (28 + M.Theme.fontSize + 4) : 28;
+                return _notifCard.implicitHeight;
+            }
+
+            // Animated version of _targetHeight — smoothly transitions header height on collapse
+            property real _displayTargetHeight: _targetHeight
+            Behavior on _displayTargetHeight {
+                NumberAnimation {
+                    duration: 150
+                    easing.type: Easing.OutCubic
+                }
+            }
+
             property real _heightScale: 1
             property bool _skipDismiss: false
 
@@ -257,11 +288,29 @@ M.HoverPanel {
                 visible: notifDelegate._type === "header"
                 anchors.fill: parent
 
+                HoverHandler {
+                    id: _headerHover
+                }
+
+                // Tap target for collapse — covers header row only, excludes dismiss button
+                Item {
+                    anchors.left: parent.left
+                    anchors.right: _groupDismissBtn.left
+                    anchors.top: parent.top
+                    height: 28
+
+                    TapHandler {
+                        cursorShape: Qt.PointingHandCursor
+                        onTapped: menuWindow._toggleCollapse(notifDelegate.modelData.appName)
+                    }
+                }
+
                 Image {
                     id: _headerIcon
                     anchors.left: parent.left
                     anchors.leftMargin: 10
-                    anchors.verticalCenter: parent.verticalCenter
+                    anchors.top: parent.top
+                    anchors.topMargin: (28 - height) / 2
                     width: M.Theme.fontSize + 2
                     height: M.Theme.fontSize + 2
                     source: {
@@ -278,12 +327,29 @@ M.HoverPanel {
                     asynchronous: true
                 }
 
+                // Collapse chevron
+                Text {
+                    id: _chevron
+                    anchors.right: _groupDismissBtn.left
+                    anchors.rightMargin: 8
+                    anchors.top: parent.top
+                    height: 28
+                    verticalAlignment: Text.AlignVCenter
+                    text: notifDelegate._type === "header" && notifDelegate.modelData.collapsed ? "\u25B8" : "\u25BE"
+                    color: M.Theme.base04
+                    font.pixelSize: M.Theme.fontSize - 2
+                    font.family: M.Theme.fontFamily
+                }
+
+                // App name
                 Text {
                     anchors.left: _headerIcon.visible ? _headerIcon.right : parent.left
                     anchors.leftMargin: _headerIcon.visible ? 6 : 10
-                    anchors.right: _groupDismissBtn.left
-                    anchors.rightMargin: 6
-                    anchors.verticalCenter: parent.verticalCenter
+                    anchors.right: _chevron.left
+                    anchors.rightMargin: 4
+                    anchors.top: parent.top
+                    height: 28
+                    verticalAlignment: Text.AlignVCenter
                     text: notifDelegate._type === "header" ? (notifDelegate.modelData.appName || "Unknown") : ""
                     color: M.Theme.base05
                     font.pixelSize: M.Theme.fontSize - 1
@@ -292,28 +358,50 @@ M.HoverPanel {
                     elide: Text.ElideRight
                 }
 
+                // Dismiss button — opacity-hidden when header not hovered
                 Text {
                     id: _groupDismissBtn
                     anchors.right: parent.right
                     anchors.rightMargin: 10
-                    anchors.verticalCenter: parent.verticalCenter
+                    anchors.top: parent.top
+                    height: 28
+                    verticalAlignment: Text.AlignVCenter
                     text: "\uF1F8"
-                    color: _groupDismissArea.containsMouse ? M.Theme.base08 : M.Theme.base04
+                    color: _groupDismissHover.hovered ? M.Theme.base08 : M.Theme.base04
                     font.pixelSize: M.Theme.fontSize - 1
                     font.family: M.Theme.iconFontFamily
+                    opacity: _headerHover.hovered ? 1 : 0
 
-                    MouseArea {
-                        id: _groupDismissArea
-                        anchors.fill: parent
-                        anchors.margins: -4
-                        hoverEnabled: true
+                    HoverHandler {
+                        id: _groupDismissHover
+                    }
+
+                    TapHandler {
                         cursorShape: Qt.PointingHandCursor
-                        onClicked: {
+                        onTapped: {
                             if (notifDelegate._type === "header")
                                 menuWindow._cascadeGroupDismiss(notifDelegate.modelData.appName);
                         }
                     }
                 }
+
+                // Collapsed preview: notification summaries on a subtitle row
+                Text {
+                    visible: notifDelegate._type === "header" && notifDelegate.modelData.collapsed
+                    anchors.left: parent.left
+                    anchors.leftMargin: 10
+                    anchors.right: parent.right
+                    anchors.rightMargin: 10
+                    anchors.top: parent.top
+                    anchors.topMargin: 28
+                    height: M.Theme.fontSize + 4
+                    verticalAlignment: Text.AlignVCenter
+                    text: notifDelegate._type === "header" ? (notifDelegate.modelData.summaries ?? "") : ""
+                    elide: Text.ElideRight
+                    font.pixelSize: M.Theme.fontSize - 2
+                    font.family: M.Theme.fontFamily
+                    color: M.Theme.base04
+                }
             }
 
             // ---- Individual notification ----