Update app.py

app.py

@@ -22,16 +22,6 @@ if NASA_API_KEY is None:
 # Must be the first Streamlit command!
 st.set_page_config(page_title="HAL - NASA ChatBot", page_icon="🚀")
 
-# --- Helper to load spaCy model with fallback ---
-def load_spacy_model():
-    try:
-        return spacy.load("en_core_web_sm")
-    except OSError:
-        subprocess.run(["python", "-m", "spacy", "download", "en_core_web_sm"], check=True)
-        return spacy.load("en_core_web_sm")
-
-nlp_spacy = load_spacy_model()
-
 # --- Initialize Session State Variables ---
 if "chat_history" not in st.session_state:
     st.session_state.chat_history = [{"role": "assistant", "content": "Hello! How can I assist you today?"}]
@@ -40,38 +30,6 @@ if "response_ready" not in st.session_state:
 if "follow_up" not in st.session_state:
     st.session_state.follow_up = ""
 
-# --- Appearance CSS ---
-st.markdown("""
-    <style>
-    .user-msg {
-        background-color: #696969;
-        color: white;
-        padding: 10px;
-        border-radius: 10px;
-        margin-bottom: 5px;
-        width: fit-content;
-        max-width: 80%;
-    }
-    .assistant-msg {
-        background-color: #333333;
-        color: white;
-        padding: 10px;
-        border-radius: 10px;
-        margin-bottom: 5px;
-        width: fit-content;
-        max-width: 80%;
-    }
-    .container {
-        display: flex;
-        flex-direction: column;
-        align-items: flex-start;
-    }
-    @media (max-width: 600px) {
-        .user-msg, .assistant-msg { font-size: 16px; max-width: 100%; }
-    }
-    </style>
-""", unsafe_allow_html=True)
-
 # --- Set Up Model & API Functions ---
 model_id = "mistralai/Mistral-7B-Instruct-v0.3"
 sentiment_analyzer = pipeline(
@@ -80,6 +38,16 @@ sentiment_analyzer = pipeline(
     revision="714eb0f"
 )
 
+# --- Helper to load spaCy model with fallback ---
+def load_spacy_model():
+    try:
+        return spacy.load("en_core_web_sm")
+    except OSError:
+        subprocess.run(["python", "-m", "spacy", "download", "en_core_web_sm"], check=True)
+        return spacy.load("en_core_web_sm")
+
+nlp_spacy = load_spacy_model()
+
 def get_llm_hf_inference(model_id=model_id, max_new_tokens=128, temperature=0.7):
     return HuggingFaceEndpoint(
         repo_id=model_id,
@@ -220,6 +188,38 @@ if st.sidebar.button("Reset Chat"):
     st.session_state.follow_up = ""
     st.experimental_rerun()
 
+# --- Appearance CSS ---
+st.markdown("""
+    <style>
+    .user-msg {
+        background-color: #696969;
+        color: white;
+        padding: 10px;
+        border-radius: 10px;
+        margin-bottom: 5px;
+        width: fit-content;
+        max-width: 80%;
+    }
+    .assistant-msg {
+        background-color: #333333;
+        color: white;
+        padding: 10px;
+        border-radius: 10px;
+        margin-bottom: 5px;
+        width: fit-content;
+        max-width: 80%;
+    }
+    .container {
+        display: flex;
+        flex-direction: column;
+        align-items: flex-start;
+    }
+    @media (max-width: 600px) {
+        .user-msg, .assistant-msg { font-size: 16px; max-width: 100%; }
+    }
+    </style>
+""", unsafe_allow_html=True)
+
 st.markdown("<div class='container'>", unsafe_allow_html=True)
 for message in st.session_state.chat_history:
     if message["role"] == "user":