diff --git a/frontend/src/chat.css b/frontend/src/chat.css
index 79b79d2..1a5f9d5 100644
--- a/frontend/src/chat.css
+++ b/frontend/src/chat.css
@@ -473,3 +473,6 @@ header h1 { font-size: 16px; font-weight: 700; letter-spacing: -.02em; margin: 0
 .viewer-body { flex: 1; overflow: auto; padding: 12px; background: #fff; color: #111; }
 .viewer-body table { border-collapse: collapse; font-size: 12px; }
 .viewer-body td, .viewer-body th { border: 1px solid #ccc; padding: 3px 8px; white-space: nowrap; }
+
+/* === 用户消息：气泡 + 下方附件（同列右对齐） === */
+.msg-stack { display: flex; flex-direction: column; align-items: flex-end; max-width: 100%; }
diff --git a/frontend/src/main.ts b/frontend/src/main.ts
index 1818975..e1ff874 100644
--- a/frontend/src/main.ts
+++ b/frontend/src/main.ts
@@ -57,16 +57,33 @@ function renderPendingAttachment(): void {
 }
 
 function attachmentChipHtml(att: AttachmentRef): string {
-  return '<div class="attach-line"><button class="attach-chip" type="button"'
-    + ' data-ft="' + esc(att.file_type) + '" data-name="' + esc(att.name) + '">📄 ' + esc(att.name) + '</button></div>';
+  return '<button class="attach-chip" type="button"'
+    + ' data-ft="' + esc(att.file_type) + '" data-name="' + esc(att.name) + '">📄 ' + esc(att.name) + '</button>';
 }
 function bindAttachChips(root: HTMLElement): void {
   root.querySelectorAll<HTMLElement>('.attach-chip').forEach((btn) => {
     btn.onclick = () => { void openAttachmentViewer(btn.dataset.ft || 'requirements', btn.dataset.name || ''); };
   });
 }
+// 用户消息：文字在气泡内，附件在气泡**下方**（同一列、右对齐）
 function addUserMsg(text: string, att: AttachmentRef | null): void {
-  const m = addMsg('user', esc(text) + (att ? attachmentChipHtml(att) : ''));
+  const m = document.createElement('div');
+  m.className = 'msg user';
+  const stack = document.createElement('div');
+  stack.className = 'msg-stack';
+  const bubble = document.createElement('div');
+  bubble.className = 'bubble';
+  bubble.innerHTML = esc(text);
+  stack.appendChild(bubble);
+  if (att) {
+    const line = document.createElement('div');
+    line.className = 'attach-line';
+    line.innerHTML = attachmentChipHtml(att);
+    stack.appendChild(line);
+  }
+  m.appendChild(stack);
+  chatEl.appendChild(m);
+  chatEl.scrollTop = chatEl.scrollHeight;
   bindAttachChips(m);
 }
 
diff --git a/src/genesis/server/static/chat.css b/src/genesis/server/static/chat.css
index a85cc7f..c70a817 100644
--- a/src/genesis/server/static/chat.css
+++ b/src/genesis/server/static/chat.css
@@ -1295,3 +1295,9 @@ header h1 {
   padding: 3px 8px;
   white-space: nowrap;
 }
+.msg-stack {
+  display: flex;
+  flex-direction: column;
+  align-items: flex-end;
+  max-width: 100%;
+}
diff --git a/src/genesis/server/static/chat.js b/src/genesis/server/static/chat.js
index 756c5f1..135a1fc 100644
--- a/src/genesis/server/static/chat.js
+++ b/src/genesis/server/static/chat.js
@@ -26948,7 +26948,7 @@ function renderPendingAttachment() {
   };
 }
 function attachmentChipHtml(att) {
-  return '<div class="attach-line"><button class="attach-chip" type="button" data-ft="' + esc(att.file_type) + '" data-name="' + esc(att.name) + '">\u{1F4C4} ' + esc(att.name) + "</button></div>";
+  return '<button class="attach-chip" type="button" data-ft="' + esc(att.file_type) + '" data-name="' + esc(att.name) + '">\u{1F4C4} ' + esc(att.name) + "</button>";
 }
 function bindAttachChips(root) {
   root.querySelectorAll(".attach-chip").forEach((btn) => {
@@ -26958,7 +26958,23 @@ function bindAttachChips(root) {
   });
 }
 function addUserMsg(text, att) {
-  const m = addMsg("user", esc(text) + (att ? attachmentChipHtml(att) : ""));
+  const m = document.createElement("div");
+  m.className = "msg user";
+  const stack = document.createElement("div");
+  stack.className = "msg-stack";
+  const bubble = document.createElement("div");
+  bubble.className = "bubble";
+  bubble.innerHTML = esc(text);
+  stack.appendChild(bubble);
+  if (att) {
+    const line = document.createElement("div");
+    line.className = "attach-line";
+    line.innerHTML = attachmentChipHtml(att);
+    stack.appendChild(line);
+  }
+  m.appendChild(stack);
+  chatEl.appendChild(m);
+  chatEl.scrollTop = chatEl.scrollHeight;
   bindAttachChips(m);
 }
 var pfName = must("pf-name");