diff --git a/conversations.php b/conversations.php
index f247cc9..f8be997 100644
--- a/conversations.php
+++ b/conversations.php
@@ -772,6 +772,10 @@
                 this.conversations = [];
                 // Track shown notifications to avoid duplicates from polling
                 this._shownNotifications = new Set();
+                // Track notifications the user dismissed/read locally so they don't reappear
+                this._dismissedNotifications = new Set();
+                // Map of pending ack notifications to retry marking as read (nid => notification)
+                this._pendingAck = new Map();
                 // Message pagination / loading state
                 this.messageLimit = 50;
                 this.loadingMessages = false;
@@ -793,6 +797,8 @@
                 this.setupEventListeners();
                 this.setupAutoRefresh();
                 this.setupNotificationPolling();
+                // start background retry loop to ack dismissed notifications on server
+                this.setupNotificationAckRetry && this.setupNotificationAckRetry();
             }
 
             setupNotificationPolling() {
@@ -820,6 +826,48 @@
                 }
             }
 
+            // Try to mark a notification as read on the server. Returns true on success.
+            async ackNotification(notification) {
+                if (!notification || !notification.id) return true; // nothing to ack on server
+                try {
+                    const resp = await fetch('api/mark_notification_read.php', {
+                        method: 'POST',
+                        headers: {'Content-Type':'application/json'},
+                        body: JSON.stringify({ id: notification.id })
+                    });
+                    if (!resp.ok) {
+                        console.warn('ackNotification: server responded with', resp.status);
+                        return false;
+                    }
+                    const j = await resp.json().catch(() => null);
+                    return !!(j && j.success) || resp.ok;
+                } catch (e) {
+                    console.warn('ackNotification failed', e);
+                    return false;
+                }
+            }
+
+            setupNotificationAckRetry() {
+                if (this._ackInterval) return;
+                this._ackInterval = setInterval(async () => {
+                    if (this._pendingAck.size === 0) return;
+                    for (const [nid, notification] of Array.from(this._pendingAck.entries())) {
+                        try {
+                            const ok = await this.ackNotification(notification);
+                            if (ok) {
+                                this._pendingAck.delete(nid);
+                                this._dismissedNotifications.add(nid);
+                                console.debug('Ack retry succeeded for', nid);
+                            } else {
+                                console.debug('Ack retry still failing for', nid);
+                            }
+                        } catch (e) {
+                            console.warn('Ack retry error for', nid, e);
+                        }
+                    }
+                }, 30000); // every 30s
+            }
+
             async showNotificationToast(notification) {
                 // Create or reuse container
                 const containerId = 'notification-toasts';
@@ -860,7 +908,7 @@
                 const actions = document.createElement('div');
                 actions.className = 'nt-actions';
 
-                const removeToast = () => {
+                const removeToastLocal = () => {
                     if (toast.parentNode) toast.remove();
                     if (this._shownNotifications.has(nid)) this._shownNotifications.delete(nid);
                 };
@@ -868,6 +916,33 @@
                 const openBtn = document.createElement('button');
                 openBtn.className = notification.cool ? 'btn btn-sm btn-light' : 'btn btn-sm btn-primary';
                 openBtn.textContent = 'Abrir';
+                openBtn.onclick = async () => {
+                    // Try ack on server; if fails, schedule retry. Always mark as dismissed locally so it won't reappear.
+                    try {
+                        const ok = await this.ackNotification(notification);
+                        if (ok) {
+                            this._dismissedNotifications.add(nid);
+                            this._pendingAck.delete(nid);
+                        } else {
+                            this._pendingAck.set(nid, notification);
+                        }
+                    } catch (e) { this._pendingAck.set(nid, notification); }
+                    removeToastLocal();
+                    // navigate to conv if present
+                    let data = {};
+                    try { data = notification.data ? JSON.parse(notification.data) : {}; } catch(e) {}
+                    const userId = data.user_id || notification.user_id;
+                    if (userId) {
+                        const conv = this.conversations.find(c => c.user_id == userId);
+                        if (conv) {
+                            this.openConversation(conv.user_id, conv.name, conv.phone_number);
+                        } else {
+                            this.openConversation(userId, 'Usuario', '');
+                        }
+                    }
+                };
+                openBtn.className = notification.cool ? 'btn btn-sm btn-light' : 'btn btn-sm btn-primary';
+                openBtn.textContent = 'Abrir';
                 openBtn.onclick = async () => {
                     try {
                         await fetch('api/mark_notification_read.php', {method:'POST', headers:{'Content-Type':'application/json'}, body: JSON.stringify({id: notification.id})});
@@ -892,9 +967,15 @@
                 dismiss.title = 'Descartar';
                 dismiss.onclick = async () => {
                     try {
-                        await fetch('api/mark_notification_read.php', {method:'POST', headers:{'Content-Type':'application/json'}, body: JSON.stringify({id: notification.id})});
-                    } catch(e) { console.warn('mark_notification_read failed', e); }
-                    removeToast();
+                        const ok = await this.ackNotification(notification);
+                        if (ok) {
+                            this._dismissedNotifications.add(nid);
+                            this._pendingAck.delete(nid);
+                        } else {
+                            this._pendingAck.set(nid, notification);
+                        }
+                    } catch(e) { this._pendingAck.set(nid, notification); }
+                    removeToastLocal();
                 };
 
                 actions.appendChild(openBtn);
@@ -908,7 +989,21 @@
                 let timeout = notification.duration ? Number(notification.duration) : (notification.cool ? 15000 : 8000);
                 if (!isFinite(timeout) || timeout <= 0) timeout = (notification.cool ? 15000 : 8000);
                 timeout = Math.max(timeout, _minToastDuration);
-                setTimeout(removeToast, timeout);
+                setTimeout(() => {
+                    // on automatic timeout, attempt ack and schedule retry if needed
+                    (async () => {
+                        try {
+                            const ok = await this.ackNotification(notification);
+                            if (ok) {
+                                this._dismissedNotifications.add(nid);
+                                this._pendingAck.delete(nid);
+                            } else {
+                                this._pendingAck.set(nid, notification);
+                            }
+                        } catch (e) { this._pendingAck.set(nid, notification); }
+                        removeToastLocal();
+                    })();
+                }, timeout);
             }
 
             setupEventListeners() {