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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<title>LexAI</title>
<link rel="icon" href="data:image/svg+xml,<svg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 100 100%22><text y=%22.9em%22 font-size=%2290%22>βš–οΈ</text></svg>">
<link href="https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,500;1,400&family=DM+Mono:wght@400;500&display=swap" rel="stylesheet">
<style>
  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

  :root {
    --bg:            #f7f4ef;
    --surface:       #ffffff;
    --surface2:      #f0ede8;
    --border:        rgba(0,0,0,0.08);
    --border2:       rgba(0,0,0,0.14);
    --text:          #1a1714;
    --muted:         #8a8480;
    --accent:        #b5601a;
    --accent-dim:    rgba(181,96,26,0.08);
    --accent-border: rgba(181,96,26,0.25);
    --green:         #2d7a4f;
    --green-bg:      #edf7f2;
    --red:           #b83030;
    --red-bg:        #fdf0f0;
    --amber:         #b87c10;
    --amber-bg:      #fdf6e8;
    --radius:        14px;

    /* model colours */
    --qwen:          #5b4fcf;
    --qwen-bg:       rgba(91,79,207,0.08);
    --qwen-border:   rgba(91,79,207,0.25);
    --llama:         #1a7a5e;
    --llama-bg:      rgba(26,122,94,0.08);
    --llama-border:  rgba(26,122,94,0.25);
  }

  html, body {
    min-height: 100vh;
    background: var(--bg);
    color: var(--text);
    font-family: 'DM Mono', monospace;
    font-size: 13px;
    line-height: 1.6;
  }

  .shell { max-width: 740px; margin: 0 auto; padding: 0 24px 80px; }

  /* ── Header ── */
  header {
    padding: 48px 0 36px;
    border-bottom: 1px solid var(--border2);
    margin-bottom: 32px;
    animation: fadeDown 0.5s ease both;
  }
  .logo {
    font-family: 'Playfair Display', Georgia, serif;
    font-size: 32px;
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: 10px;
  }
  .logo-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); display: inline-block; margin-bottom: 2px; }
  .tagline  { font-size: 11px; color: var(--muted); letter-spacing: 0.1em; text-transform: uppercase; margin-top: 6px; }

  /* ── Cards ── */
  .stack { display: flex; flex-direction: column; gap: 16px; }

  .card {
    background: var(--surface);
    border: 1px solid var(--border2);
    border-radius: var(--radius);
    padding: 22px 24px;
    animation: fadeUp 0.45s ease both;
    position: relative;
    overflow: hidden;
  }
  .card::before {
    content: '';
    position: absolute;
    left: 0; top: 0; bottom: 0;
    width: 3px;
    background: var(--border2);
    border-radius: 3px 0 0 3px;
  }
  .card.active::before { background: var(--accent); }
  .card.done::before   { background: var(--green); }
  .card:nth-child(2)   { animation-delay: 0.07s; }
  .card:nth-child(3)   { animation-delay: 0.14s; }

  .card-title { font-size: 13px; font-weight: 500; color: var(--text); margin-bottom: 14px; }

  /* ── Inputs ── */
  input[type=text] {
    width: 100%;
    background: var(--surface2);
    border: 1px solid var(--border2);
    border-radius: 8px;
    color: var(--text);
    font-family: 'DM Mono', monospace;
    font-size: 12px;
    padding: 10px 14px;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
  }
  input[type=text]:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-dim); }
  input[type=text]::placeholder { color: var(--muted); }
  .query-input { font-family: 'Playfair Display', Georgia, serif !important; font-size: 16px !important; padding: 14px 16px !important; }
  .query-input::placeholder { font-style: italic; }

  /* ── Buttons ── */
  .btn {
    font-family: 'DM Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.06em;
    padding: 10px 20px;
    border-radius: 8px;
    border: 1px solid var(--border2);
    background: var(--surface);
    color: var(--text);
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.15s;
  }
  .btn:hover   { background: var(--surface2); }
  .btn:active  { transform: scale(0.98); }
  .btn.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
  .btn.primary:hover { opacity: 0.88; }
  .btn:disabled { opacity: 0.35; cursor: not-allowed; transform: none; }

  .row { display: flex; gap: 8px; align-items: stretch; }
  .row input { flex: 1; }

  /* ── Status pills ── */
  .pill {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 7px 12px;
    border-radius: 8px;
    font-size: 11px;
    margin-top: 10px;
    border: 1px solid transparent;
    transition: all 0.3s;
  }
  .pill.idle  { background: var(--surface2); color: var(--muted); border-color: var(--border2); }
  .pill.amber { background: var(--amber-bg); color: var(--amber); border-color: rgba(184,124,16,0.25); }
  .pill.green { background: var(--green-bg); color: var(--green); border-color: rgba(45,122,79,0.25); }
  .pill.red   { background: var(--red-bg);   color: var(--red);   border-color: rgba(184,48,48,0.25); }
  .pill-dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; flex-shrink: 0; }
  .pill.amber .pill-dot { animation: pulse 1s infinite; }

  /* ── Drop zone ── */
  .drop {
    border: 1.5px dashed var(--border2);
    border-radius: 10px;
    padding: 32px 20px;
    text-align: center;
    cursor: pointer;
    position: relative;
    transition: all 0.2s;
    background: var(--surface2);
  }
  .drop:hover, .drop.over { border-color: var(--accent); background: var(--accent-dim); }
  .drop input  { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%; }
  .drop p      { color: var(--muted); font-size: 12px; }
  .drop strong { color: var(--text); }
  #file-chip {
    display: none;
    margin-top: 10px;
    background: var(--accent-dim);
    color: var(--accent);
    border: 1px solid var(--accent-border);
    border-radius: 6px;
    padding: 6px 12px;
    font-size: 11px;
    word-break: break-all;
  }

  /* ── Model switcher ── */
  .model-switcher {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
  }
  .model-label {
    font-size: 11px;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    flex-shrink: 0;
  }
  .model-tabs {
    display: flex;
    background: var(--surface2);
    border: 1px solid var(--border2);
    border-radius: 9px;
    padding: 3px;
    gap: 3px;
  }
  .model-tab {
    font-family: 'DM Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.05em;
    padding: 6px 16px;
    border-radius: 6px;
    border: none;
    background: transparent;
    color: var(--muted);
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
  }
  .model-tab:hover { color: var(--text); }
  .model-tab.active[data-model="qwen"] {
    background: var(--qwen-bg);
    color: var(--qwen);
    border: 1px solid var(--qwen-border);
    box-shadow: 0 1px 3px rgba(91,79,207,0.12);
  }
  .model-tab.active[data-model="llama"] {
    background: var(--llama-bg);
    color: var(--llama);
    border: 1px solid var(--llama-border);
    box-shadow: 0 1px 3px rgba(26,122,94,0.12);
  }
  .model-icon { font-size: 13px; }

  /* model badge shown in answer card */
  .model-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 10px;
    padding: 3px 9px;
    border-radius: 20px;
    margin-bottom: 12px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
  }
  .model-badge.qwen  { background: var(--qwen-bg);  color: var(--qwen);  border: 1px solid var(--qwen-border); }
  .model-badge.llama { background: var(--llama-bg); color: var(--llama); border: 1px solid var(--llama-border); }

  /* ── Answer ── */
  #query-card  { display: none; }
  #answer-card { display: none; }

  .answer-body { background: var(--surface2); border-radius: 10px; padding: 20px 22px; }
  .answer-text {
    font-family: 'Playfair Display', Georgia, serif;
    font-size: 17px;
    line-height: 1.9;
    color: var(--text);
    white-space: pre-wrap;
  }
  .cite-label { font-size: 10px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); margin: 14px 0 8px; }
  .cite-tags  { display: flex; flex-wrap: wrap; gap: 6px; }
  .cite-tag   {
    font-size: 10px;
    padding: 4px 10px;
    border-radius: 20px;
    background: var(--accent-dim);
    color: var(--accent);
    border: 1px solid var(--accent-border);
  }

  /* ── Spinner ── */
  .spin {
    display: inline-block;
    width: 10px; height: 10px;
    border: 1.5px solid var(--border2);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: rotate 0.6s linear infinite;
  }

  /* ── Animations ── */
  @keyframes fadeDown { from { opacity:0; transform:translateY(-10px); } to { opacity:1; transform:translateY(0); } }
  @keyframes fadeUp   { from { opacity:0; transform:translateY(12px);  } to { opacity:1; transform:translateY(0); } }
  @keyframes rotate   { to { transform:rotate(360deg); } }
  @keyframes pulse    { 0%,100%{opacity:1} 50%{opacity:0.3} }
  @keyframes slideIn  { from { opacity:0; transform:translateY(10px); } to { opacity:1; transform:translateY(0); } }
</style>
</head>
<body>
<div class="shell">
  <header>
    <div class="logo"><span class="logo-dot"></span>LexAI</div>
    <div class="tagline">Constitutional Document Intelligence</div>
  </header>

  <div class="stack">

    <!-- ── UPLOAD ── -->
    <div class="card active" id="card-upload">
      <div class="card-title">Upload documents</div>
      <p style="font-size:11px;color:var(--muted);margin-bottom:14px">Upload both PDFs β€” they will be merged into one searchable index.</p>

      <!-- English -->
      <div style="margin-bottom:14px">
        <div style="font-size:11px;text-transform:uppercase;letter-spacing:0.08em;color:var(--muted);margin-bottom:6px">πŸ‡¬πŸ‡§ English PDF</div>
        <div class="drop" id="drop-en">
          <input type="file" id="file-input-en" accept=".pdf"/>
          <div style="font-size:20px;opacity:0.3;margin-bottom:6px">↑</div>
          <p><strong>Drop English PDF</strong> or click to browse</p>
        </div>
        <div id="file-chip-en" style="display:none;margin-top:8px;background:var(--accent-dim);color:var(--accent);border:1px solid var(--accent-border);border-radius:6px;padding:6px 12px;font-size:11px;word-break:break-all;"></div>
        <button class="btn primary" id="upload-btn-en" style="width:100%;margin-top:8px" disabled>Index English PDF</button>
        <div class="pill idle" id="pill-en" style="margin-top:8px"><span class="pill-dot"></span><span id="msg-en">No file selected</span></div>
      </div>

      <!-- Arabic -->
      <div>
        <div style="font-size:11px;text-transform:uppercase;letter-spacing:0.08em;color:var(--muted);margin-bottom:6px">πŸ‡ͺπŸ‡¬ Arabic PDF</div>
        <div class="drop" id="drop-ar">
          <input type="file" id="file-input-ar" accept=".pdf"/>
          <div style="font-size:20px;opacity:0.3;margin-bottom:6px">↑</div>
          <p><strong>Drop Arabic PDF</strong> or click to browse</p>
        </div>
        <div id="file-chip-ar" style="display:none;margin-top:8px;background:var(--accent-dim);color:var(--accent);border:1px solid var(--accent-border);border-radius:6px;padding:6px 12px;font-size:11px;word-break:break-all;"></div>
        <button class="btn primary" id="upload-btn-ar" style="width:100%;margin-top:8px" disabled>Index Arabic PDF</button>
        <div class="pill idle" id="pill-ar" style="margin-top:8px"><span class="pill-dot"></span><span id="msg-ar">No file selected</span></div>
      </div>
    </div>

    <!-- ── QUERY ── hidden until upload done -->
    <div class="card active" id="query-card">
      <div class="card-title">Ask a question</div>

      <!-- Model switcher -->
      <div class="model-switcher">
        <span class="model-label">Model</span>
        <div class="model-tabs" role="group" aria-label="Model selection">
          <button class="model-tab active" data-model="qwen" id="tab-qwen" title="Qwen3-32b β€” best for Arabic + multilingual RAG">
            <span class="model-icon">🧠</span> Qwen
          </button>
          <button class="model-tab" data-model="llama" id="tab-llama" title="LLaMA 3.3-70b β€” best reasoning & summarisation">
            <span class="model-icon">πŸ¦™</span> LLaMA
          </button>
        </div>
      </div>

      <div class="row">
        <input type="text" class="query-input" id="query-input" placeholder="What does Article 15 say about…"/>
        <button class="btn primary" id="ask-btn">Ask β†’</button>
      </div>
    </div>

    <!-- ── ANSWER ── hidden until query done -->
    <div class="card done" id="answer-card">
      <div class="card-title">Answer</div>
      <div class="answer-body">
        <div id="model-badge-wrap"></div>
        <div class="answer-text" id="answer-text"></div>
        <div class="cite-label">Sources</div>
        <div class="cite-tags" id="cite-tags"></div>
      </div>
    </div>

  </div><!-- .stack -->
</div><!-- .shell -->

<script>
  // ── API base URL β€” change if you expose via ngrok ────────────────────────
  const API = "";  // HF Spaces: same-origin, no host needed

  const $ = id => document.getElementById(id);

  // ── Model state ───────────────────────────────────────────────────────────
  let activeModel = "qwen";

  document.querySelectorAll(".model-tab").forEach(tab => {
    tab.addEventListener("click", () => {
      document.querySelectorAll(".model-tab").forEach(t => t.classList.remove("active"));
      tab.classList.add("active");
      activeModel = tab.dataset.model;
    });
  });

  // ── Upload logic ──────────────────────────────────────────────────────────
  function setupUpload({ dropId, inputId, chipId, btnId, pillId, msgId, endpoint }) {
    const drop = $(dropId);
    const input = $(inputId);
    const chip  = $(chipId);
    const btn   = $(btnId);
    const msg   = $(msgId);
    const pill  = $(pillId);
    let file = null;

    function setPill(state, text) {
      pill.className = "pill " + state;
      msg.textContent = text;
    }

    function applyFile(f) {
      if (!f || f.type !== "application/pdf") return;
      file = f;
      chip.style.display = "block";
      chip.textContent = "πŸ“„ " + f.name + " β€” " + (f.size / 1024).toFixed(0) + " KB";
      btn.disabled = false;
      setPill("amber", "Ready β€” click to index");
    }

    input.addEventListener("change", () => applyFile(input.files[0]));
    drop.addEventListener("dragover",  e => { e.preventDefault(); drop.classList.add("over"); });
    drop.addEventListener("dragleave", ()  => drop.classList.remove("over"));
    drop.addEventListener("drop", e => { e.preventDefault(); drop.classList.remove("over"); applyFile(e.dataTransfer.files[0]); });

    btn.addEventListener("click", async () => {
      if (!file) return;
      setPill("amber", "Uploading & indexing…");
      btn.disabled = true;
      btn.innerHTML = '<span class="spin"></span> Processing…';

      const fd = new FormData();
      fd.append("file", file);

      try {
        const r = await fetch(API + endpoint, { method: "POST", body: fd });
        if (!r.ok) {
          const err = await r.json().catch(() => ({}));
          throw new Error(err.detail || r.statusText);
        }
        const data = await r.json();
        setPill("green", data.message);

        // Show query card once at least one PDF is indexed
        $("query-card").style.display = "block";
        $("query-card").style.animation = "slideIn 0.4s ease both";
        $("query-input").focus();

      } catch(e) {
        setPill("red", "Failed: " + e.message);
      }

      btn.disabled = false;
      btn.textContent = btn.id.includes("en") ? "Index English PDF" : "Index Arabic PDF";
    });
  }

  setupUpload({ dropId:"drop-en", inputId:"file-input-en", chipId:"file-chip-en", btnId:"upload-btn-en", pillId:"pill-en", msgId:"msg-en", endpoint:"/upload/english" });
  setupUpload({ dropId:"drop-ar", inputId:"file-input-ar", chipId:"file-chip-ar", btnId:"upload-btn-ar", pillId:"pill-ar", msgId:"msg-ar", endpoint:"/upload/arabic"  });

  // ── Query logic ───────────────────────────────────────────────────────────
  async function ask() {
    const q = $("query-input").value.trim();
    if (!q) return;

    $("ask-btn").innerHTML = '<span class="spin"></span>';
    $("ask-btn").disabled = true;
    $("answer-card").style.display = "none";

    try {
      const r = await fetch(API + "/query", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ query: q, model: activeModel, lang: "auto" }),
      });

      if (!r.ok) {
        const err = await r.json().catch(() => ({}));
        throw new Error(err.detail || r.statusText);
      }

      const j = await r.json();

      // model badge
      const badge = document.createElement("span");
      badge.className = "model-badge " + (j.model_used || activeModel);
      const icons = { qwen: "🧠", llama: "πŸ¦™" };
      badge.textContent = (icons[j.model_used] || "") + " " + (j.model_used || activeModel).toUpperCase();
      $("model-badge-wrap").innerHTML = "";
      $("model-badge-wrap").appendChild(badge);

      $("answer-text").textContent = j.answer || "No answer returned.";

      $("cite-tags").innerHTML = "";
      (j.citations || []).forEach(c => {
        const t = document.createElement("span");
        t.className = "cite-tag";
        t.textContent = c;
        $("cite-tags").appendChild(t);
      });

      $("answer-card").style.display = "block";
      $("answer-card").style.animation = "slideIn 0.4s ease both";

    } catch(e) {
      $("answer-text").textContent = "Error: " + e.message;
      $("model-badge-wrap").innerHTML = "";
      $("answer-card").style.display = "block";
    }

    $("ask-btn").textContent = "Ask β†’";
    $("ask-btn").disabled = false;
  }

  $("ask-btn").addEventListener("click", ask);
  $("query-input").addEventListener("keydown", e => { if (e.key === "Enter") ask(); });
</script>
</body>
</html>