', unsafe_allow_html=True)\n\n st.markdown('', unsafe_allow_html=True)\n\n\n# ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ\n# β VIEW 1: UPLOAD β\n# β FIX: Removed rb-page/rb-center wrapper divs. β\n# β stMainBlockContainer already centers to 860px. β\n# β All content now flows top-to-bottom in the same DOM. β\n# ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ\nif v == \"upload\":\n\n # Hero β rendered as pure HTML block, flows first\n st.markdown(f\"\"\"\n
\n
Upload your Textbook
\n
Drop any PDF β algorithms, CS, math, science β and ResolvaBot will extract, chunk, and index it for AI-powered Q&A.
\n\"\"\", unsafe_allow_html=True)\n\n # API keys (compact, only when no key)\n if not (has_groq or has_openai):\n with st.expander(\"π Set LLM API Key (required for answers)\", expanded=True):\n k1, k2 = st.columns(2)\n with k1:\n gk = st.text_input(\"Groq Key (free)\", value=st.session_state.groq_key,\n type=\"password\", placeholder=\"gsk_...\", help=\"console.groq.com\")\n if gk != st.session_state.groq_key:\n st.session_state.groq_key=gk; os.environ[\"GROQ_API_KEY\"]=gk; st.rerun()\n with k2:\n ok = st.text_input(\"OpenAI Key\", value=st.session_state.openai_key,\n type=\"password\", placeholder=\"sk-...\")\n if ok != st.session_state.openai_key:\n st.session_state.openai_key=ok; os.environ[\"OPENAI_API_KEY\"]=ok; st.rerun()\n\n # Two-column layout β placed AFTER hero in the same flow\n lc, rc = st.columns([1.1, 0.9], gap=\"medium\")\n\n with lc:\n st.markdown(\"\"\"
\n
\n
π
\n
PDF Textbook
Drag & drop or browse
\n
\n
\"\"\", unsafe_allow_html=True)\n\n if st.session_state.indexed:\n st.markdown(f\"\"\"
\"\"\", unsafe_allow_html=True)\n\n step_placeholders = []\n for i, (icon, name, desc) in enumerate(STEPS, 1):\n is_last = (i == len(STEPS))\n if s >= i: sc,nc,bc,bl,nl = \"done\",\"pn-d\",\"pbdg-d\",\"β Done\",\"dn\"\n elif s==i-1 and uploaded and not st.session_state.indexed:\n sc,nc,bc,bl,nl = \"actv\",\"pn-a\",\"pbdg-a\",\"Runningβ¦\",\"av\"\n else: sc,nc,bc,bl,nl = \"\",\"pn-i\",\"pbdg-i\",str(i),\"\"\n conn = \"\" if is_last else f'
', unsafe_allow_html=True)\n\n if msg.get(\"passages\"):\n with st.expander(f\"π {len(msg['passages'])} source passages\", expanded=False):\n for j, r in enumerate(msg[\"passages\"][:6], 1):\n pg = f\"Page {r['page']}\" if r.get(\"page\",-1)>0 else \"Summary\"\n scr = r.get(\"rrf_score\",0)\n txt = r[\"text\"]\n cr = sum(1 for c in txt if c in \"{}()<>;=\") / max(len(txt),1)\n st.markdown(f'
#{j} Β· {pg}{scr:.4f}
', unsafe_allow_html=True)\n if cr > 0.06: st.code(txt, language=detect_lang(txt))\n else: st.markdown(f'
\n\"\"\", unsafe_allow_html=True)\n\n question = st.chat_input(\"Ask anything about the textbookβ¦\")\n\n st.markdown(f'
Enter to send
', unsafe_allow_html=True)\n st.markdown('
', unsafe_allow_html=True)\n\n if question:\n st.session_state.history.append({\"role\":\"user\",\"content\":question})\n with st.spinner(\"\"):\n from question_answering import answer_question\n results = st.session_state.retriever.retrieve(question, top_k=8)\n result = answer_question(question, results, use_llm=True)\n st.session_state.cur_passages = results\n st.session_state.history.append({\n \"role\":\"assistant\",\"content\":result[\"answer\"],\n \"source\":result[\"source\"],\"model\":result[\"model\"],\n \"llm_error\":result.get(\"llm_error\"),\"passages\":results,\n })\n st.rerun()\n\n# ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ\n# β VIEW 3: SOURCES & PDF (FIX 6) β\n# β FIX: Removed fixed-position outer container. β\n# β Content now flows directly in stMainBlockContainer. β\n# β PDF iframe uses full column width and tall height. β\n# ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ\nelif v == \"sources\":\n if not st.session_state.indexed:\n st.warning(\"Upload and index a PDF first.\")\n if st.button(\"β Go to Upload\"): go(\"upload\")\n else:\n passages = (\n st.session_state.history[-1].get(\"passages\",[])\n if st.session_state.history and st.session_state.history[-1][\"role\"]==\"assistant\"\n else st.session_state.cur_passages\n )\n fname = st.session_state.last_file or \"document.pdf\"\n n_pages = st.session_state.pages\n\n # Sources page: PDF viewer takes full width, passages shown below\n st.markdown(f\"\"\"\n
\n
\n π\n PDF Viewer Β· {n_pages} pages\n {fname}\n
\n\"\"\", unsafe_allow_html=True)\n\n if st.session_state.last_file_bytes:\n b64 = base64.b64encode(st.session_state.last_file_bytes).decode()\n st.markdown(f\"\"\"\n\n\"\"\", unsafe_allow_html=True)\n else:\n st.markdown(\n f'