diff --git a/static/css/conversations.css b/static/css/conversations.css
index 5a704d6..c961dbb 100644
--- a/static/css/conversations.css
+++ b/static/css/conversations.css
@@ -1491,3 +1491,167 @@ mark.search-highlight {
         animation: slide-up 0.2s ease-out;
     }
 }
+
+/* ============================================================
+ * NEW MESSAGE MODAL
+ * ============================================================ */
+
+.modal-overlay {
+    position: fixed;
+    inset: 0;
+    background: rgba(0, 0, 0, 0.45);
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    z-index: 1100;
+}
+
+.modal-overlay .modal-content {
+    background: var(--conv-surface);
+    border-radius: var(--conv-radius-lg);
+    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
+    width: 90%;
+    max-width: 520px;
+    max-height: 80vh;
+    display: flex;
+    flex-direction: column;
+    overflow: hidden;
+}
+
+.modal-overlay .modal-header {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    padding: 16px 20px;
+    border-bottom: 1px solid var(--conv-border);
+}
+
+.modal-overlay .modal-header h3 {
+    margin: 0;
+    font-size: 17px;
+    font-weight: 600;
+    color: var(--conv-text-primary);
+}
+
+.modal-overlay .modal-close {
+    background: none;
+    border: none;
+    font-size: 22px;
+    color: var(--conv-text-muted);
+    cursor: pointer;
+    padding: 0 4px;
+    line-height: 1;
+}
+.modal-overlay .modal-close:hover {
+    color: var(--conv-text-primary);
+}
+
+.modal-overlay .modal-body {
+    padding: 16px 20px;
+    flex: 1;
+    overflow-y: auto;
+}
+
+.modal-overlay .recipient-input {
+    margin-bottom: 12px;
+}
+
+.modal-overlay .recipient-input label {
+    font-size: 14px;
+    font-weight: 500;
+    color: var(--conv-text-secondary);
+    margin-right: 8px;
+}
+
+.modal-overlay .recipient-input input[type="text"] {
+    width: 100%;
+    padding: 10px 12px;
+    border: 1px solid var(--conv-border);
+    border-radius: var(--conv-radius);
+    font-size: 14px;
+    margin-top: 6px;
+    outline: none;
+    transition: border-color 0.15s;
+    box-sizing: border-box;
+}
+.modal-overlay .recipient-input input[type="text"]:focus {
+    border-color: var(--conv-primary);
+}
+
+.modal-overlay .recipient-suggestions {
+    border: 1px solid var(--conv-border);
+    border-radius: var(--conv-radius);
+    margin-top: 4px;
+    max-height: 200px;
+    overflow-y: auto;
+    background: var(--conv-surface);
+}
+.modal-overlay .recipient-suggestions:empty {
+    display: none;
+}
+
+.modal-overlay .selected-recipients {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 4px;
+    margin-top: 8px;
+}
+
+.modal-overlay #newMessageEditor {
+    min-height: 120px;
+    border: 1px solid var(--conv-border);
+    border-radius: var(--conv-radius);
+}
+
+.modal-overlay .ql-toolbar.ql-snow {
+    border: none;
+    border-bottom: 1px solid var(--conv-border);
+    padding: 6px 8px;
+}
+
+.modal-overlay .ql-container.ql-snow {
+    border: none;
+    font-size: 14px;
+}
+
+.modal-overlay .modal-footer {
+    display: flex;
+    justify-content: flex-end;
+    gap: 8px;
+    padding: 12px 20px;
+    border-top: 1px solid var(--conv-border);
+}
+
+.modal-overlay .modal-footer button {
+    padding: 8px 20px;
+    border-radius: var(--conv-radius);
+    font-size: 14px;
+    font-weight: 500;
+    cursor: pointer;
+    border: none;
+    transition: background 0.15s;
+}
+
+.modal-overlay .btn-secondary {
+    background: var(--conv-surface-secondary);
+    color: var(--conv-text-primary);
+}
+.modal-overlay .btn-secondary:hover {
+    background: var(--conv-border);
+}
+
+.modal-overlay .btn-primary {
+    background: var(--conv-primary);
+    color: #fff;
+}
+.modal-overlay .btn-primary:hover {
+    background: var(--conv-primary-hover);
+}
+
+@media (max-width: 768px) {
+    .modal-overlay .modal-content {
+        width: 95%;
+        max-height: 90vh;
+        border-radius: var(--conv-radius);
+    }
+}
diff --git a/templates/messages/conversations.html b/templates/messages/conversations.html
index b5178fe..0f8388a 100644
--- a/templates/messages/conversations.html
+++ b/templates/messages/conversations.html
@@ -5,7 +5,7 @@
 
 {% block head_extra %}
 <link rel="stylesheet" href="{{ url_for('static', filename='css/quill.snow.css') }}">
-<link rel="stylesheet" href="{{ url_for('static', filename='css/conversations.css') }}?v=10">
+<link rel="stylesheet" href="{{ url_for('static', filename='css/conversations.css') }}?v=11">
 <script src="{{ url_for('static', filename='js/vendor/quill.js') }}"></script>
 <style>
   footer { display: none !important; }