Reduce sidebar top spacing above LiiS logo

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app.py

@@ -118,7 +118,12 @@ st.markdown(f"""
     .stSuccess, .stInfo {{ border-radius: 8px; }}
     .stDataFrame {{ border-radius: 8px; }}
     .streamlit-expanderHeader {{ border-radius: 8px; }}
-    [data-testid="stSidebar"] > div:first-child {{ padding-top: 1rem; }}
+    [data-testid="stSidebar"] > div:first-child {{ padding-top: 0rem; }}
+    [data-testid="stSidebar"] [data-testid="stVerticalBlock"] {{ gap: 0.5rem; }}
+    [data-testid="stSidebar"] .block-container {{ padding-top: 0; }}
+    section[data-testid="stSidebar"] {{ top: 0; padding-top: 0; }}
+    [data-testid="stSidebarCollapsedControl"] {{ top: 0.5rem; }}
+    [data-testid="stSidebar"] [data-testid="stMarkdown"]:first-child {{ margin-top: 0; }}
 </style>
 """, unsafe_allow_html=True)