diff --git a/poc4_active_source_20260714/src/agent_console/presentation.py b/poc4_active_source_20260714/src/agent_console/presentation.py
index f41326b..a387a50 100644
--- a/poc4_active_source_20260714/src/agent_console/presentation.py
+++ b/poc4_active_source_20260714/src/agent_console/presentation.py
@@ -44,6 +44,18 @@ def apply_console_theme(st: Any, profile: AppProfile) -> None:
         [data-testid="stJson"] code {{
           background:transparent !important; color:var(--console-text) !important;
           -webkit-text-fill-color:var(--console-text) !important; }}
+        /* Chat responses are rendered in a separate Streamlit surface.  Without
+           these rules a dark browser theme can leave the answer card dark while
+           its Markdown keeps the light-theme text color. */
+        div[data-testid="stChatMessage"], div[data-testid="stChatMessageContent"] {{
+          background:#fff !important; color:var(--console-text) !important;
+          border-color:var(--console-border) !important; color-scheme:light !important; }}
+        div[data-testid="stChatMessage"] [data-testid="stMarkdownContainer"],
+        div[data-testid="stChatMessage"] [data-testid="stMarkdownContainer"] *,
+        div[data-testid="stChatMessage"] [data-testid="stCaptionContainer"],
+        div[data-testid="stChatMessage"] [data-testid="stCaptionContainer"] * {{
+          color:var(--console-text) !important;
+          -webkit-text-fill-color:var(--console-text) !important; }}
         div[data-testid="stButton"] > button, div[data-testid="stFormSubmitButton"] > button {{
           background:#fff !important; color:var(--console-text) !important;
           -webkit-text-fill-color:var(--console-text) !important;