diff --git a/src/pages/RiskAssistantPage.vue b/src/pages/RiskAssistantPage.vue
index 74f0c87..6eb0be7 100644
--- a/src/pages/RiskAssistantPage.vue
+++ b/src/pages/RiskAssistantPage.vue
@@ -590,6 +590,11 @@ async function scrollToBottom(behavior: "smooth" | "auto" = "smooth") {
                 <button
                   type="button"
                   class="assistant-thinking__header"
+                  :disabled="!message.riskResult && !message.responseCard"
+                  :aria-expanded="
+                    (!message.riskResult && !message.responseCard) ||
+                    expandedReplies.has(message.id)
+                  "
                   @click="toggleReply(message.id)"
                 >
                   <span
@@ -603,6 +608,7 @@ async function scrollToBottom(behavior: "smooth" | "auto" = "smooth") {
                     >
                   </span>
                   <ChevronDown
+                    v-if="message.riskResult || message.responseCard"
                     :size="13"
                     class="assistant-thinking__arrow"
                     :class="{ expanded: expandedReplies.has(message.id) }"
@@ -613,6 +619,7 @@ async function scrollToBottom(behavior: "smooth" | "auto" = "smooth") {
                   class="assistant-bubble"
                   :class="{
                     'assistant-bubble--collapsed':
+                      (message.riskResult || message.responseCard) &&
                       !expandedReplies.has(message.id),
                   }"
                 >
@@ -934,6 +941,8 @@ async function scrollToBottom(behavior: "smooth" | "auto" = "smooth") {
   color: var(--color-text-secondary);
   font-size: 13px;
   line-height: 1.65;
+  white-space: pre-wrap;
+  overflow-wrap: anywhere;
 }
 
 .assistant-bubble--collapsed {
@@ -965,7 +974,11 @@ async function scrollToBottom(behavior: "smooth" | "auto" = "smooth") {
   transition: background 0.15s, color 0.15s;
 }
 
-.assistant-thinking__header:hover {
+.assistant-thinking__header:disabled {
+  cursor: default;
+}
+
+.assistant-thinking__header:not(:disabled):hover {
   background: var(--color-bg-warm);
   color: var(--color-text-secondary);
 }