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app.py

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+"""Main Streamlit app — sidebar routing."""
+import streamlit as st
+
+# Page config must be called first
+st.set_page_config(
+    page_title="AI 학습 플랫폼 | 타이타닉 ML/DL",
+    page_icon="🤖",
+    layout="wide",
+    initial_sidebar_state="expanded",
+)
+
+# Import pages
+from views import home, ml_lab, dl_lab, roadmap, career
+
+PAGES = {
+    "홈 (EDA)": home,
+    "ML 실습": ml_lab,
+    "딥러닝 실습": dl_lab,
+    "학습 로드맵": roadmap,
+    "AI 직무 분석": career,
+}
+
+ICONS = {
+    "홈 (EDA)": "🏠",
+    "ML 실습": "🔬",
+    "딥러닝 실습": "🧠",
+    "학습 로드맵": "🗺️",
+    "AI 직무 분석": "💼",
+}
+
+# ── Session state for active page ──
+if "page" not in st.session_state:
+    st.session_state.page = "홈 (EDA)"
+
+page_keys = list(PAGES.keys())
+active_idx = page_keys.index(st.session_state.page) + 1  # 1-based for CSS nth-of-type
+
+# ── CSS: hide auto nav, style sidebar buttons ──
+st.markdown(f"""
+<style>
+[data-testid="stSidebarNav"] {{
+    display: none;
+}}
+section[data-testid="stSidebar"] .stButton button {{
+    width: 100%;
+    text-align: left;
+    background-color: transparent;
+    border: none;
+    border-radius: 6px;
+    padding: 8px 14px;
+    font-size: 14px;
+    cursor: pointer;
+    transition: background-color 0.15s;
+}}
+section[data-testid="stSidebar"] .stButton button:hover {{
+    background-color: rgba(255, 255, 255, 0.08);
+}}
+section[data-testid="stSidebar"] .stButton:nth-of-type({active_idx}) button {{
+    background-color: rgba(99, 155, 255, 0.22) !important;
+    border-left: 3px solid #639BFF !important;
+    font-weight: 600;
+}}
+</style>
+""", unsafe_allow_html=True)
+
+# ── Sidebar navigation ──
+st.sidebar.title("AI 학습 플랫폼")
+st.sidebar.markdown("타이타닉으로 배우는 ML/DL")
+st.sidebar.markdown("---")
+
+for page_name in page_keys:
+    if st.sidebar.button(f"{ICONS[page_name]}  {page_name}", key=f"nav_{page_name}"):
+        st.session_state.page = page_name
+        st.rerun()
+
+st.sidebar.markdown("---")
+st.sidebar.markdown("""
+**데이터**: Seaborn Titanic
+**프레임워크**: sklearn + PyTorch
+**배포**: Hugging Face Spaces
+""")
+
+# ── Route to selected page ──
+PAGES[st.session_state.page].show()