diff --git a/admin-ui/.gitignore b/admin-ui/.gitignore
new file mode 100644
index 0000000..4d26965
--- /dev/null
+++ b/admin-ui/.gitignore
@@ -0,0 +1,2 @@
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diff --git a/admin-ui/package-lock.json b/admin-ui/package-lock.json
new file mode 100644
index 0000000..c7c8bcf
--- /dev/null
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diff --git a/admin-ui/package.json b/admin-ui/package.json
new file mode 100644
index 0000000..7b9c391
--- /dev/null
+++ b/admin-ui/package.json
@@ -0,0 +1,13 @@
+{
+  "name": "jellyfin-lessons-admin-ui",
+  "version": "1.0.0",
+  "description": "Web admin UI for managing Jellyfin Lessons",
+  "main": "server.js",
+  "scripts": {
+    "start": "node server.js"
+  },
+  "dependencies": {
+    "better-sqlite3": "^11.0.0",
+    "express": "^4.21.0"
+  }
+}
diff --git a/admin-ui/public/index.html b/admin-ui/public/index.html
new file mode 100644
index 0000000..b37696b
--- /dev/null
+++ b/admin-ui/public/index.html
@@ -0,0 +1,408 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Jellyfin Lessons — Admin</title>
+  <style>
+    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
+    body {
+      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+      background: #f5f5f5; color: #333; min-height: 100vh;
+    }
+    #app { display: flex; min-height: 100vh; }
+    /* Sidebar */
+    #sidebar {
+      width: 280px; background: #1a1a2e; color: #eee;
+      display: flex; flex-direction: column; flex-shrink: 0;
+    }
+    #sidebar h2 {
+      padding: 20px; font-size: 18px; border-bottom: 1px solid #333;
+      display: flex; justify-content: space-between; align-items: center;
+    }
+    #sidebar h2 button {
+      background: #0f3460; color: #e94560; border: none; padding: 6px 14px;
+      border-radius: 4px; cursor: pointer; font-size: 13px; font-weight: 600;
+    }
+    #sidebar h2 button:hover { background: #16213e; }
+    #lesson-list { flex: 1; overflow-y: auto; padding: 10px 0; }
+    .grade-group { margin-bottom: 4px; }
+    .grade-header {
+      padding: 8px 20px; font-size: 12px; font-weight: 700; text-transform: uppercase;
+      color: #999; cursor: pointer; user-select: none;
+    }
+    .grade-header:hover { color: #e94560; }
+    .grade-header::before { content: '▸ '; display: inline-block; transition: transform 0.2s; font-size: 10px; }
+    .grade-header.open::before { transform: rotate(90deg); }
+    .grade-lessons { display: none; }
+    .grade-lessons.open { display: block; }
+    .lesson-item {
+      padding: 8px 20px 8px 32px; cursor: pointer; font-size: 14px;
+      border-left: 3px solid transparent; transition: all 0.15s;
+    }
+    .lesson-item:hover { background: #16213e; }
+    .lesson-item.active { background: #0f3460; border-left-color: #e94560; font-weight: 600; }
+    .lesson-item .subject-tag {
+      font-size: 11px; color: #888; display: block;
+    }
+    /* Main */
+    #main {
+      flex: 1; padding: 30px 40px; overflow-y: auto;
+    }
+    #main h1 { font-size: 24px; margin-bottom: 24px; color: #1a1a2e; }
+    #editor { max-width: 800px; }
+    .field { margin-bottom: 16px; }
+    .field label {
+      display: block; font-size: 13px; font-weight: 600; margin-bottom: 4px; color: #555;
+    }
+    .field input, .field textarea, .field select {
+      width: 100%; padding: 8px 12px; border: 1px solid #ccc; border-radius: 4px;
+      font-size: 14px; font-family: inherit;
+    }
+    .field textarea { resize: vertical; }
+    .field textarea#typst-source {
+      font-family: 'Fira Code', 'Cascadia Code', 'JetBrains Mono', monospace;
+      min-height: 300px; tab-size: 2;
+    }
+    .row { display: flex; gap: 16px; }
+    .row .field { flex: 1; }
+    .btn-row { display: flex; gap: 10px; margin-top: 20px; }
+    button {
+      padding: 10px 20px; border: none; border-radius: 4px; cursor: pointer;
+      font-size: 14px; font-weight: 600; transition: background 0.15s;
+    }
+    .btn-primary { background: #e94560; color: #fff; }
+    .btn-primary:hover { background: #c73650; }
+    .btn-secondary { background: #0f3460; color: #eee; }
+    .btn-secondary:hover { background: #16213e; }
+    .btn-danger { background: #dc3545; color: #fff; }
+    .btn-danger:hover { background: #b52a38; }
+
+    /* Status */
+    #status { margin-top: 12px; font-size: 13px; min-height: 20px; }
+    .status-ok { color: #28a745; }
+    .status-err { color: #dc3545; }
+
+    /* Preview */
+    #preview-section { margin-top: 24px; }
+    #preview-section h3 {
+      font-size: 16px; margin-bottom: 10px; color: #1a1a2e;
+    }
+    #preview-frame {
+      width: 100%; min-height: 400px; border: 1px solid #ddd; border-radius: 4px;
+      background: #fff;
+    }
+    #preview-frame iframe {
+      width: 100%; height: 500px; border: none;
+    }
+
+    /* Media items */
+    #media-section { margin-top: 24px; border-top: 1px solid #ddd; padding-top: 16px; }
+    #media-section h3 { font-size: 16px; margin-bottom: 10px; color: #1a1a2e; }
+    .media-row {
+      display: flex; gap: 8px; align-items: center; margin-bottom: 8px;
+    }
+    .media-row input { flex: 1; }
+    .media-row input.sort { width: 70px; flex: none; }
+    .media-row button {
+      padding: 6px 12px; font-size: 12px; background: #666; color: #fff; border-radius: 4px;
+    }
+    .media-row button:hover { background: #444; }
+    .add-media-btn { background: #0f3460; color: #eee; margin-top: 4px; }
+    .add-media-btn:hover { background: #16213e; }
+
+    /* Empty state */
+    .empty-state {
+      text-align: center; padding: 60px 20px; color: #999;
+    }
+    .empty-state p { font-size: 16px; }
+  </style>
+</head>
+<body>
+<div id="app">
+  <div id="sidebar">
+    <h2>Lessons <button onclick="newLesson()" title="New Lesson">+ New</button></h2>
+    <div id="lesson-list"><div class="empty-state"><p>Loading…</p></div></div>
+  </div>
+  <div id="main">
+    <h1>Lesson Editor</h1>
+    <div id="editor" style="display:none;">
+      <div class="row">
+        <div class="field"><label>Title</label><input id="title" placeholder="Lesson title"></div>
+        <div class="field"><label>Subject</label><input id="subject" placeholder="e.g. Math, History"></div>
+      </div>
+      <div class="row">
+        <div class="field"><label>Grade</label><input id="grade" type="number" placeholder="Grade level" min="0"></div>
+        <div class="field"><label>Date</label><input id="lesson-date" type="date"></div>
+      </div>
+      <div class="field"><label>Description</label><textarea id="description" rows="2" placeholder="Brief description of the lesson"></textarea></div>
+      <div class="field"><label>Typst Source</label><textarea id="typst-source" placeholder="#set page(width: auto, height: auto, margin: 15pt)
+#set text(font: &quot;Linux Libertine&quot;, size: 12pt)
+
+= Lesson Title
+
+Your content here..."></textarea></div>
+      <div class="btn-row">
+        <button class="btn-secondary" onclick="compilePreview()">Preview</button>
+        <button class="btn-primary" onclick="saveLesson()">Save</button>
+        <button class="btn-danger" onclick="deleteLesson()" id="delete-btn" style="display:none;">Delete</button>
+      </div>
+      <div id="status"></div>
+
+      <div id="preview-section" style="display:none;">
+        <h3>Preview</h3>
+        <div id="preview-frame"></div>
+      </div>
+
+      <div id="media-section">
+        <h3>Media Items</h3>
+        <div id="media-list"></div>
+        <button class="add-media-btn" onclick="addMediaItem()">+ Add Media Item</button>
+      </div>
+    </div>
+    <div class="empty-state" id="no-selection">
+      <p>Select a lesson from the sidebar or create a new one.</p>
+    </div>
+  </div>
+</div>
+
+<script>
+const API = '/api/lessons';
+let currentLesson = null;
+let allLessons = [];
+
+// --- Sidebar ---
+async function loadLessons() {
+  try {
+    const res = await fetch(API);
+    allLessons = await res.json();
+    renderSidebar();
+  } catch (e) {
+    document.getElementById('lesson-list').innerHTML = '<div class="empty-state"><p>Error loading lessons</p></div>';
+  }
+}
+
+function renderSidebar() {
+  const container = document.getElementById('lesson-list');
+  if (allLessons.length === 0) {
+    container.innerHTML = '<div class="empty-state"><p>No lessons yet</p></div>';
+    return;
+  }
+  // Group by grade
+  const byGrade = {};
+  for (const l of allLessons) {
+    const g = l.grade ?? 'Ungrouped';
+    if (!byGrade[g]) byGrade[g] = [];
+    byGrade[g].push(l);
+  }
+  const sortedGrades = Object.keys(byGrade).sort((a, b) => {
+    if (a === 'Ungrouped') return 1;
+    if (b === 'Ungrouped') return -1;
+    return Number(a) - Number(b);
+  });
+
+  let html = '';
+  for (const grade of sortedGrades) {
+    const label = grade === 'Ungrouped' ? 'Ungrouped' : `Grade ${grade}`;
+    html += `<div class="grade-group">
+      <div class="grade-header open" onclick="toggleGrade(this)">${label} (${byGrade[grade].length})</div>
+      <div class="grade-lessons open">`;
+    for (const l of byGrade[grade].sort((a, b) => a.title.localeCompare(b.title))) {
+      const active = currentLesson && currentLesson.id === l.id ? ' active' : '';
+      const subject = l.subject ? `<span class="subject-tag">${escHtml(l.subject)}</span>` : '';
+      html += `<div class="lesson-item${active}" onclick="selectLesson(${l.id})">
+        ${escHtml(l.title)}${subject}
+      </div>`;
+    }
+    html += '</div></div>';
+  }
+  container.innerHTML = html;
+}
+
+function toggleGrade(el) {
+  el.classList.toggle('open');
+  el.nextElementSibling.classList.toggle('open');
+}
+
+function escHtml(s) {
+  if (!s) return '';
+  return s.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;');
+}
+
+// --- Editor ---
+async function selectLesson(id) {
+  try {
+    const res = await fetch(`${API}/${id}`);
+    if (!res.ok) throw new Error('Not found');
+    currentLesson = await res.json();
+    renderSidebar();
+    showEditor();
+  } catch (e) {
+    setStatus('Error loading lesson: ' + e.message, 'err');
+  }
+}
+
+function newLesson() {
+  currentLesson = {
+    id: null, title: '', grade: '', subject: '', lesson_date: '',
+    description: '', source_path: '', compiled_html: '', mediaItems: []
+  };
+  renderSidebar();
+  showEditor();
+}
+
+function showEditor() {
+  document.getElementById('editor').style.display = 'block';
+  document.getElementById('no-selection').style.display = 'none';
+  document.getElementById('delete-btn').style.display = currentLesson.id ? 'inline-block' : 'none';
+  document.getElementById('preview-section').style.display = 'none';
+
+  document.getElementById('title').value = currentLesson.title || '';
+  document.getElementById('subject').value = currentLesson.subject || '';
+  document.getElementById('grade').value = currentLesson.grade ?? '';
+  document.getElementById('lesson-date').value = currentLesson.lesson_date || '';
+  document.getElementById('description').value = currentLesson.description || '';
+  document.getElementById('typst-source').value = currentLesson.source_path || '';
+  document.getElementById('status').textContent = '';
+
+  renderMediaItems();
+}
+
+// --- Media Items ---
+function renderMediaItems() {
+  const container = document.getElementById('media-list');
+  const items = currentLesson.mediaItems || [];
+  let html = '';
+  items.forEach((item, i) => {
+    html += `<div class="media-row">
+      <input type="text" value="${escHtml(item.jellyfin_item_id)}"
+             onchange="updateMediaItem(${i}, 'jellyfinItemId', this.value)" placeholder="Jellyfin Item UUID">
+      <input type="number" class="sort" value="${item.sort_order || 0}"
+             onchange="updateMediaItem(${i}, 'sortOrder', parseInt(this.value) || 0)" placeholder="Order" min="0">
+      <button onclick="removeMediaItem(${i})">✕</button>
+    </div>`;
+  });
+  container.innerHTML = html;
+}
+
+function addMediaItem() {
+  if (!currentLesson) return;
+  if (!currentLesson.mediaItems) currentLesson.mediaItems = [];
+  currentLesson.mediaItems.push({ jellyfinItemId: '', sortOrder: currentLesson.mediaItems.length });
+  renderMediaItems();
+}
+
+function updateMediaItem(index, key, value) {
+  if (!currentLesson || !currentLesson.mediaItems) return;
+  currentLesson.mediaItems[index][key] = value;
+}
+
+function removeMediaItem(index) {
+  if (!currentLesson || !currentLesson.mediaItems) return;
+  currentLesson.mediaItems.splice(index, 1);
+  renderMediaItems();
+}
+
+// --- Compile ---
+async function compilePreview() {
+  const typst = document.getElementById('typst-source').value;
+  if (!typst.trim()) {
+    setStatus('Typst source is empty', 'err');
+    return;
+  }
+  setStatus('Compiling…', '');
+  try {
+    const res = await fetch('/api/compile', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ typst })
+    });
+    if (!res.ok) {
+      const err = await res.json();
+      throw new Error(err.error || 'Compilation failed');
+    }
+    const data = await res.json();
+    // Show in iframe for proper rendering
+    const frame = document.getElementById('preview-frame');
+    frame.innerHTML = `<iframe srcdoc="${data.html.replace(/"/g, '&quot;')}"></iframe>`;
+    document.getElementById('preview-section').style.display = 'block';
+    // Also store compiled HTML
+    currentLesson.compiled_html = data.html;
+    setStatus('Compiled successfully', 'ok');
+  } catch (e) {
+    setStatus('Compile error: ' + e.message, 'err');
+    document.getElementById('preview-section').style.display = 'block';
+    document.getElementById('preview-frame').innerHTML =
+      `<pre style="padding:16px;color:#dc3545;white-space:pre-wrap;">${escHtml(e.message)}</pre>`;
+  }
+}
+
+// --- Save ---
+async function saveLesson() {
+  const title = document.getElementById('title').value.trim();
+  if (!title) { setStatus('Title is required', 'err'); return; }
+
+  // Re-read fields to capture last-seen media items
+  const body = {
+    id: currentLesson.id || undefined,
+    title,
+    grade: parseInt(document.getElementById('grade').value) || null,
+    subject: document.getElementById('subject').value.trim() || null,
+    lessonDate: document.getElementById('lesson-date').value || null,
+    description: document.getElementById('description').value.trim() || null,
+    sourcePath: document.getElementById('typst-source').value,
+    compiledHtml: currentLesson.compiled_html || null,
+    mediaItems: (currentLesson.mediaItems || []).map(m => ({
+      jellyfinItemId: m.jellyfinItemId,
+      sortOrder: m.sortOrder
+    }))
+  };
+
+  setStatus('Saving…', '');
+  try {
+    const res = await fetch(API, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify(body)
+    });
+    if (!res.ok) {
+      const err = await res.json();
+      throw new Error(err.error || 'Save failed');
+    }
+    currentLesson = await res.json();
+    setStatus('Saved!', 'ok');
+    loadLessons();
+    showEditor();
+  } catch (e) {
+    setStatus('Save error: ' + e.message, 'err');
+  }
+}
+
+// --- Delete ---
+async function deleteLesson() {
+  if (!currentLesson || !currentLesson.id) return;
+  if (!confirm(`Delete "${currentLesson.title}"? This cannot be undone.`)) return;
+  try {
+    const res = await fetch(`${API}/${currentLesson.id}`, { method: 'DELETE' });
+    if (!res.ok) throw new Error('Delete failed');
+    currentLesson = null;
+    setStatus('');
+    loadLessons();
+    document.getElementById('editor').style.display = 'none';
+    document.getElementById('no-selection').style.display = 'block';
+  } catch (e) {
+    setStatus('Delete error: ' + e.message, 'err');
+  }
+}
+
+function setStatus(msg, cls) {
+  const el = document.getElementById('status');
+  el.textContent = msg;
+  el.className = cls ? 'status-' + cls : '';
+}
+
+// Init
+loadLessons();
+</script>
+</body>
+</html>
diff --git a/admin-ui/server.js b/admin-ui/server.js
new file mode 100644
index 0000000..14ba129
--- /dev/null
+++ b/admin-ui/server.js
@@ -0,0 +1,175 @@
+const express = require('express');
+const Database = require('better-sqlite3');
+const path = require('path');
+const fs = require('fs');
+const os = require('os');
+const { execSync } = require('child_process');
+
+const app = express();
+const PORT = 3099;
+
+// DB path shared with plugin
+const DB_PATH = path.join(os.homedir(), '.local', 'share', 'jellyfin-lessons', 'lessons.db');
+
+// Ensure DB directory exists
+fs.mkdirSync(path.dirname(DB_PATH), { recursive: true });
+
+const db = new Database(DB_PATH);
+
+// UUID helper
+function generateId() {
+  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, c => {
+    const r = Math.random() * 16 | 0;
+    return (c === 'x' ? r : (r & 0x3 | 0x8)).toString(16);
+  });
+}
+
+// Initialize schema — must match plugin Data/LessonStore.cs
+const now = () => new Date().toISOString();
+db.exec(`
+  CREATE TABLE IF NOT EXISTS lessons (
+    id TEXT PRIMARY KEY,
+    title TEXT NOT NULL,
+    grade INTEGER NOT NULL,
+    subject TEXT NOT NULL,
+    lesson_date TEXT NOT NULL,
+    description TEXT,
+    source_path TEXT NOT NULL,
+    compiled_html TEXT,
+    created_at TEXT NOT NULL,
+    updated_at TEXT NOT NULL
+  );
+
+  CREATE TABLE IF NOT EXISTS lesson_media (
+    lesson_id TEXT NOT NULL,
+    jellyfin_item_id TEXT NOT NULL,
+    sort_order INTEGER NOT NULL DEFAULT 0,
+    PRIMARY KEY (lesson_id, jellyfin_item_id),
+    FOREIGN KEY (lesson_id) REFERENCES lessons(id) ON DELETE CASCADE
+  );
+`);
+
+// Middleware
+app.use(express.json({ limit: '10mb' }));
+app.use(express.static(path.join(__dirname, 'public')));
+
+// CORS for local dev
+app.use((req, res, next) => {
+  res.header('Access-Control-Allow-Origin', '*');
+  res.header('Access-Control-Allow-Methods', 'GET, POST, DELETE, OPTIONS');
+  res.header('Access-Control-Allow-Headers', 'Content-Type');
+  if (req.method === 'OPTIONS') return res.sendStatus(200);
+  next();
+});
+
+// GET /api/lessons — list all lessons
+app.get('/api/lessons', (req, res) => {
+  try {
+    const lessons = db.prepare('SELECT * FROM lessons ORDER BY updated_at DESC').all();
+    res.json(lessons);
+  } catch (err) {
+    res.status(500).json({ error: err.message });
+  }
+});
+
+// GET /api/lessons/:id — single lesson with media items
+app.get('/api/lessons/:id', (req, res) => {
+  try {
+    const lesson = db.prepare('SELECT * FROM lessons WHERE id = ?').get(req.params.id);
+    if (!lesson) return res.status(404).json({ error: 'Lesson not found' });
+    const mediaItems = db.prepare('SELECT * FROM lesson_media WHERE lesson_id = ? ORDER BY sort_order').all(req.params.id);
+    res.json({ ...lesson, mediaItems });
+  } catch (err) {
+    res.status(500).json({ error: err.message });
+  }
+});
+
+// POST /api/lessons — create or update lesson
+app.post('/api/lessons', (req, res) => {
+  try {
+    const { id, title, grade, subject, lessonDate, description, sourcePath, compiledHtml, mediaItems } = req.body;
+
+    if (!title) return res.status(400).json({ error: 'Title is required' });
+
+    const upsertLesson = db.transaction(() => {
+      let lessonId = id || generateId();
+      const ts = now();
+      const existing = id ? db.prepare('SELECT created_at FROM lessons WHERE id = ?').get(id) : null;
+      const createdAt = existing ? existing.created_at : ts;
+
+      db.prepare(`
+        INSERT INTO lessons (id, title, grade, subject, lesson_date, description, source_path, compiled_html, created_at, updated_at)
+        VALUES (@id, @title, @grade, @subject, @lesson_date, @description, @source_path, @compiled_html, @created_at, @updated_at)
+        ON CONFLICT(id) DO UPDATE SET
+          title = excluded.title, grade = excluded.grade, subject = excluded.subject,
+          lesson_date = excluded.lesson_date, description = excluded.description,
+          source_path = excluded.source_path, compiled_html = excluded.compiled_html,
+          updated_at = excluded.updated_at
+      `).run({
+        id: lessonId, title, grade: grade || 0,
+        subject: subject || '', lesson_date: lessonDate || new Date().toISOString().split('T')[0],
+        description: description || null, source_path: sourcePath || '',
+        compiled_html: compiledHtml || null, created_at: createdAt, updated_at: ts
+      });
+
+      // Replace media items
+      db.prepare('DELETE FROM lesson_media WHERE lesson_id = ?').run(lessonId);
+      if (mediaItems && Array.isArray(mediaItems)) {
+        const insertMedia = db.prepare('INSERT INTO lesson_media (lesson_id, jellyfin_item_id, sort_order) VALUES (?, ?, ?)');
+        for (const item of mediaItems) {
+          insertMedia.run(lessonId, item.jellyfinItemId, item.sortOrder || 0);
+        }
+      }
+
+      return lessonId;
+    });
+
+    const lessonId = upsertLesson();
+    const lesson = db.prepare('SELECT * FROM lessons WHERE id = ?').get(lessonId);
+    const media = db.prepare('SELECT * FROM lesson_media WHERE lesson_id = ? ORDER BY sort_order').all(lessonId);
+    res.json({ ...lesson, mediaItems: media });
+  } catch (err) {
+    res.status(500).json({ error: err.message });
+  }
+});
+
+// DELETE /api/lessons/:id
+app.delete('/api/lessons/:id', (req, res) => {
+  try {
+    const result = db.prepare('DELETE FROM lessons WHERE id = ?').run(req.params.id);
+    if (result.changes === 0) return res.status(404).json({ error: 'Lesson not found' });
+    res.json({ deleted: true });
+  } catch (err) {
+    res.status(500).json({ error: err.message });
+  }
+});
+
+// POST /api/compile — compile Typst to HTML
+app.post('/api/compile', (req, res) => {
+  try {
+    const { typst } = req.body;
+    if (!typst) return res.status(400).json({ error: 'typst source is required' });
+
+    // Write to temp file
+    const tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'typst-'));
+    const srcFile = path.join(tmpDir, 'lesson.typ');
+    const outFile = path.join(tmpDir, 'lesson.html');
+
+    fs.writeFileSync(srcFile, typst);
+
+    try {
+      execSync(`typst compile "${srcFile}" "${outFile}"`, { timeout: 10000, encoding: 'utf8' });
+      const html = fs.readFileSync(outFile, 'utf8');
+      res.json({ html });
+    } finally {
+      // Cleanup
+      fs.rmSync(tmpDir, { recursive: true, force: true });
+    }
+  } catch (err) {
+    res.status(500).json({ error: err.stderr || err.message });
+  }
+});
+
+app.listen(PORT, () => {
+  console.log(`Jellyfin Lessons Admin UI running at http://localhost:${PORT}`);
+});
diff --git a/flake.nix b/flake.nix
index 2645a68..114ed09 100644
--- a/flake.nix
+++ b/flake.nix
@@ -68,5 +68,50 @@
           ) { };
         }
       );
+
+      nixosModules.default =
+        { config, lib, pkgs, ... }:
+        let
+          cfg = config.services.jellyfin-lessons;
+        in
+        {
+          options.services.jellyfin-lessons = {
+            enable = lib.mkEnableOption "Jellyfin Lessons plugin";
+            dataDir = lib.mkOption {
+              type = lib.types.str;
+              default = "/var/lib/jellyfin-lessons";
+              description = "Directory for lessons database";
+            };
+            adminPort = lib.mkOption {
+              type = lib.types.port;
+              default = 3099;
+              description = "Port for admin UI";
+            };
+          };
+
+          config = lib.mkIf cfg.enable {
+            # Copy plugin DLL to Jellyfin plugins directory on jellyfin preStart
+            systemd.services.jellyfin = {
+              preStart = let
+                pluginPkg = self.packages.${pkgs.system}.default;
+              in ''
+                mkdir -p /var/lib/jellyfin/plugins/Lessons
+                cp -f ${pluginPkg}/lib/jellyfin-lessons/*.dll /var/lib/jellyfin/plugins/Lessons/
+              '';
+            };
+
+            # Admin UI as a user systemd service
+            systemd.user.services.jellyfin-lessons-admin = {
+              description = "Jellyfin Lessons Admin UI";
+              after = [ "network.target" ];
+              wantedBy = [ "default.target" ];
+              serviceConfig = {
+                ExecStart = "${pkgs.nodejs}/bin/node ${self}/admin-ui/server.js";
+                Restart = "on-failure";
+                Environment = "PORT=${toString cfg.adminPort}";
+              };
+            };
+          };
+        };
     };
 }
diff --git a/plugin/Api/LessonsController.cs b/plugin/Api/LessonsController.cs
index aad1b18..d2f53c8 100644
--- a/plugin/Api/LessonsController.cs
+++ b/plugin/Api/LessonsController.cs
@@ -31,4 +31,35 @@ public class LessonsController : ControllerBase
 
         return Ok(summaries);
     }
+
+    [HttpGet("Detail")]
+    public IActionResult Detail([FromQuery] string id)
+    {
+        if (string.IsNullOrEmpty(id))
+            return BadRequest("Lesson id is required.");
+
+        var lesson = _store.GetLessonById(id);
+        if (lesson == null)
+            return NotFound();
+
+        return Ok(new
+        {
+            id = lesson.Id,
+            title = lesson.Title,
+            grade = lesson.Grade,
+            subject = lesson.Subject,
+            lessonDate = lesson.LessonDate,
+            description = lesson.Description,
+            sourcePath = lesson.SourcePath,
+            compiledHtml = lesson.CompiledHtml,
+            createdAt = lesson.CreatedAt,
+            updatedAt = lesson.UpdatedAt,
+            mediaItems = lesson.MediaItems.Select(m => new
+            {
+                lessonId = m.LessonId,
+                jellyfinItemId = m.JellyfinItemId,
+                sortOrder = m.SortOrder
+            })
+        });
+    }
 }
diff --git a/plugin/Configuration/lessonsPage.html b/plugin/Configuration/lessonsPage.html
index 30034e4..c226509 100644
--- a/plugin/Configuration/lessonsPage.html
+++ b/plugin/Configuration/lessonsPage.html
@@ -23,6 +23,32 @@
             margin-bottom: 1em;
             color: #fff;
         }
+        h2 {
+            font-size: 1.3em;
+            font-weight: 600;
+            color: #fff;
+            margin: 0.5em 0;
+        }
+
+        /* Back button */
+        .back-btn {
+            display: inline-block;
+            background: #2a2a2a;
+            color: #00a4dc;
+            border: 1px solid #444;
+            border-radius: 4px;
+            padding: 0.4em 0.8em;
+            cursor: pointer;
+            font-size: 0.9em;
+            margin-bottom: 1em;
+            transition: background 0.2s, border-color 0.2s;
+        }
+        .back-btn:hover {
+            background: #333;
+            border-color: #00a4dc;
+        }
+
+        /* List view */
         .grade-group {
             margin-bottom: 2em;
         }
@@ -57,40 +83,158 @@
             color: #999;
             margin-top: 0.25em;
         }
-        .empty-state {
-            text-align: center;
-            padding: 3em;
+
+        /* Detail view */
+        .detail-meta {
+            color: #aaa;
+            font-size: 0.9em;
+            margin-bottom: 1.5em;
+        }
+        .detail-meta span {
+            margin-right: 1.5em;
+        }
+        .detail-body {
+            background: #1a1a1a;
+            border: 1px solid #333;
+            border-radius: 6px;
+            padding: 1.5em;
+            margin-bottom: 2em;
+            line-height: 1.6;
+            overflow-wrap: break-word;
+        }
+        .detail-body h1, .detail-body h2, .detail-body h3 {
+            color: #fff;
+            margin-top: 1.2em;
+            margin-bottom: 0.5em;
+        }
+        .detail-body h1 { font-size: 1.5em; }
+        .detail-body h2 { font-size: 1.3em; }
+        .detail-body h3 { font-size: 1.1em; }
+        .detail-body p { margin: 0.5em 0; }
+        .detail-body ul, .detail-body ol { padding-left: 1.5em; }
+        .detail-body img { max-width: 100%; border-radius: 4px; }
+        .detail-body table { border-collapse: collapse; width: 100%; }
+        .detail-body td, .detail-body th { border: 1px solid #444; padding: 0.4em 0.6em; }
+        .detail-body a { color: #00a4dc; }
+
+        /* Media section */
+        .media-section {
+            margin-bottom: 2em;
+        }
+        .media-section h2 {
+            margin-bottom: 0.75em;
+        }
+        .media-grid {
+            display: grid;
+            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
+            gap: 0.75em;
+        }
+        .media-card {
+            background: #1a1a1a;
+            border: 1px solid #333;
+            border-radius: 6px;
+            overflow: hidden;
+            cursor: pointer;
+            transition: background 0.2s, border-color 0.2s;
+        }
+        .media-card:hover {
+            background: #222;
+            border-color: #00a4dc;
+        }
+        .media-thumb {
+            width: 100%;
+            height: 112px;
+            object-fit: cover;
+            background: #252525;
+            display: block;
+        }
+        .media-thumb-placeholder {
+            width: 100%;
+            height: 112px;
+            background: #252525;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            font-size: 2em;
+            color: #555;
+        }
+        .media-info {
+            padding: 0.5em 0.6em;
+        }
+        .media-name {
+            font-weight: 600;
+            font-size: 0.9em;
+            color: #fff;
+            white-space: nowrap;
+            overflow: hidden;
+            text-overflow: ellipsis;
+        }
+        .media-duration {
+            font-size: 0.8em;
+            color: #888;
+            margin-top: 0.15em;
+        }
+        .media-loading {
             color: #666;
+            font-size: 0.85em;
+            padding: 0.5em 0;
         }
-        .error-state {
+
+        /* States */
+        .empty-state, .error-state, .loading {
             text-align: center;
             padding: 3em;
-            color: #c44;
-        }
-        .loading {
-            text-align: center;
-            padding: 3em;
-            color: #666;
         }
+        .empty-state { color: #666; }
+        .error-state { color: #c44; }
+        .loading { color: #666; }
     </style>
 </head>
 <body>
     <div class="page">
-        <h1>📚 Lessons</h1>
+        <h1 id="page-title">📚 Lessons</h1>
         <div id="content" class="loading">Loading lessons&hellip;</div>
     </div>
 
     <script>
         (function() {
             var container = document.getElementById('content');
+            var pageTitle = document.getElementById('page-title');
+            var currentView = 'list'; // 'list' | 'detail'
 
-            function apiUrl() {
-                // Use the Jellyfin base URL from the current page context
-                var base = window.location.origin;
-                return base + '/Plugins/Lessons/List';
+            function apiBase() {
+                return window.location.origin + '/Plugins/Lessons';
             }
 
-            function renderLessons(lessons) {
+            function esc(str) {
+                if (!str) return '';
+                var div = document.createElement('div');
+                div.appendChild(document.createTextNode(str));
+                return div.innerHTML;
+            }
+
+            function formatDuration(ticks) {
+                if (!ticks && ticks !== 0) return '';
+                var totalSeconds = Math.floor(ticks / 10000000);
+                var hours = Math.floor(totalSeconds / 3600);
+                var minutes = Math.floor((totalSeconds % 3600) / 60);
+                var seconds = totalSeconds % 60;
+                if (hours > 0) {
+                    return hours + ':' + pad(minutes) + ':' + pad(seconds);
+                }
+                return minutes + ':' + pad(seconds);
+            }
+
+            function pad(n) {
+                return n < 10 ? '0' + n : '' + n;
+            }
+
+            // --- List view ---
+
+            function renderList(lessons) {
+                currentView = 'list';
+                pageTitle.textContent = '📚 Lessons';
+
                 if (!lessons || lessons.length === 0) {
                     container.className = 'empty-state';
                     container.innerHTML = '<p>No lessons found. Lessons will appear here after you build them.</p>';
@@ -111,7 +255,7 @@
                     html += '<div class="grade-group">';
                     html += '<div class="grade-header">Grade ' + grade + '</div>';
                     gradeMap[grade].forEach(function(l) {
-                        html += '<div class="lesson-card">';
+                        html += '<div class="lesson-card" data-lesson-id="' + esc(l.id) + '" onclick="viewLesson(\'' + esc(l.id) + '\')">';
                         html += '<div class="lesson-title">' + esc(l.title) + '</div>';
                         html += '<div class="lesson-meta">';
                         html += esc(l.subject || '');
@@ -128,24 +272,188 @@
                 container.innerHTML = html;
             }
 
-            function esc(str) {
-                var div = document.createElement('div');
-                div.appendChild(document.createTextNode(str));
-                return div.innerHTML;
+            // --- Detail view ---
+
+            function renderDetail(lesson) {
+                currentView = 'detail';
+                pageTitle.textContent = lesson.title;
+
+                var html = '';
+
+                // Back button
+                html += '<button class="back-btn" onclick="showList()">← Back to Lessons</button>';
+
+                // Metadata
+                html += '<div class="detail-meta">';
+                html += '<span>Grade ' + esc(String(lesson.grade)) + '</span>';
+                html += '<span>' + esc(lesson.subject) + '</span>';
+                if (lesson.lessonDate) html += '<span>' + esc(lesson.lessonDate) + '</span>';
+                html += '</div>';
+
+                if (lesson.description) {
+                    html += '<div class="detail-meta">' + esc(lesson.description) + '</div>';
+                }
+
+                // Compiled HTML body
+                if (lesson.compiledHtml) {
+                    html += '<div class="detail-body">' + lesson.compiledHtml + '</div>';
+                } else {
+                    html += '<div class="detail-body" style="color:#666;">No lesson content available.</div>';
+                }
+
+                // Media section
+                if (lesson.mediaItems && lesson.mediaItems.length > 0) {
+                    html += '<div class="media-section">';
+                    html += '<h2>📺 Media</h2>';
+                    html += '<div class="media-grid" id="media-grid">';
+                    html += '<div class="media-loading">Loading media details&hellip;</div>';
+                    html += '</div>';
+                    html += '</div>';
+
+                    container.innerHTML = html;
+
+                    // Fetch media details asynchronously
+                    loadMediaItems(lesson.mediaItems);
+                } else {
+                    container.innerHTML = html;
+                }
             }
 
-            fetch(apiUrl())
-                .then(function(resp) {
-                    if (!resp.ok) throw new Error('HTTP ' + resp.status);
-                    return resp.json();
-                })
-                .then(function(data) {
-                    renderLessons(data);
-                })
-                .catch(function(err) {
-                    container.className = 'error-state';
-                    container.innerHTML = '<p>Failed to load lessons: ' + esc(err.message) + '</p>';
+            function loadMediaItems(mediaItems) {
+                var grid = document.getElementById('media-grid');
+                if (!grid) return;
+
+                var userId = null;
+                try {
+                    userId = Dashboard.getCurrentUserId();
+                } catch (e) {
+                    // Dashboard may not be available in all contexts
+                }
+
+                if (!userId) {
+                    grid.innerHTML = '<div class="media-loading">Unable to identify user for media playback.</div>';
+                    return;
+                }
+
+                var promises = mediaItems.map(function(m) {
+                    return fetch('/Users/' + userId + '/Items/' + m.jellyfinItemId)
+                        .then(function(r) {
+                            if (!r.ok) throw new Error('HTTP ' + r.status);
+                            return r.json();
+                        })
+                        .then(function(item) {
+                            return renderMediaCard(item);
+                        })
+                        .catch(function(err) {
+                            return '<div class="media-card" style="cursor:default;opacity:0.6;">' +
+                                '<div class="media-thumb-placeholder">⚠️</div>' +
+                                '<div class="media-info">' +
+                                '<div class="media-name">' + esc(m.jellyfinItemId) + '</div>' +
+                                '<div class="media-duration">Unavailable</div>' +
+                                '</div></div>';
+                        });
                 });
+
+                Promise.all(promises).then(function(cards) {
+                    grid.innerHTML = cards.join('');
+                });
+            }
+
+            function renderMediaCard(item) {
+                var imageTag = '';
+                if (item.ImageTags && item.ImageTags.Primary) {
+                    var imgUrl = window.ApiClient.getScaledImageUrl(item.Id, { type: 'Primary', tag: item.ImageTags.Primary });
+                    imageTag = '<img class="media-thumb" src="' + imgUrl + '" alt="' + esc(item.Name) + '">';
+                } else if (item.BackdropImageTags && item.BackdropImageTags.length > 0) {
+                    var backdropUrl = window.ApiClient.getScaledImageUrl(item.Id, { type: 'Backdrop', tag: item.BackdropImageTags[0] });
+                    imageTag = '<img class="media-thumb" src="' + backdropUrl + '" alt="' + esc(item.Name) + '">';
+                } else {
+                    imageTag = '<div class="media-thumb-placeholder">▶️</div>';
+                }
+
+                var durationStr = '';
+                if (item.RunTimeTicks) {
+                    durationStr = formatDuration(item.RunTimeTicks);
+                }
+
+                // Use JSON.stringify to safely embed the item for the click handler
+                var itemJson = JSON.stringify(item).replace(/'/g, "\\'").replace(/"/g, '&quot;');
+
+                return '<div class="media-card" onclick="playMedia(\'' + item.Id + '\')">' +
+                    imageTag +
+                    '<div class="media-info">' +
+                    '<div class="media-name">' + esc(item.Name) + '</div>' +
+                    (durationStr ? '<div class="media-duration">' + esc(durationStr) + '</div>' : '') +
+                    '</div></div>';
+            }
+
+            // --- Navigation & playback (exposed globally for onclick handlers) ---
+
+            window.viewLesson = function(id) {
+                container.className = 'loading';
+                container.innerHTML = 'Loading lesson&hellip;';
+
+                fetch(apiBase() + '/Detail?id=' + encodeURIComponent(id))
+                    .then(function(resp) {
+                        if (!resp.ok) throw new Error('HTTP ' + resp.status);
+                        return resp.json();
+                    })
+                    .then(function(lesson) {
+                        renderDetail(lesson);
+                    })
+                    .catch(function(err) {
+                        container.className = 'error-state';
+                        container.innerHTML = '<p>Failed to load lesson: ' + esc(err.message) + '</p>' +
+                            '<button class="back-btn" onclick="showList()">← Back to Lessons</button>';
+                    });
+            };
+
+            window.showList = function() {
+                container.className = 'loading';
+                container.innerHTML = 'Loading lessons&hellip;';
+
+                fetch(apiBase() + '/List')
+                    .then(function(resp) {
+                        if (!resp.ok) throw new Error('HTTP ' + resp.status);
+                        return resp.json();
+                    })
+                    .then(function(data) {
+                        renderList(data);
+                    })
+                    .catch(function(err) {
+                        container.className = 'error-state';
+                        container.innerHTML = '<p>Failed to load lessons: ' + esc(err.message) + '</p>';
+                    });
+            };
+
+            window.playMedia = function(itemId) {
+                // Use Jellyfin's appRouter to navigate to the item detail/player
+                try {
+                    if (window.appRouter && typeof window.appRouter.showItem === 'function') {
+                        window.appRouter.showItem(itemId);
+                    } else if (window.ApiClient && typeof window.ApiClient.getItem === 'function') {
+                        var userId = Dashboard.getCurrentUserId();
+                        window.ApiClient.getItem(userId, itemId).then(function(item) {
+                            if (window.appRouter) {
+                                window.appRouter.showItem(item);
+                            } else if (window.Dashboard && window.Dashboard.navigate) {
+                                Dashboard.navigate('itemdetails.html?id=' + itemId);
+                            } else {
+                                window.location.href = '#!/details?id=' + itemId;
+                            }
+                        });
+                    } else {
+                        // Fallback: navigate to item details page directly
+                        window.location.href = '#!/details?id=' + itemId;
+                    }
+                } catch (e) {
+                    // Last resort fallback
+                    window.location.href = '#!/details?id=' + itemId;
+                }
+            };
+
+            // --- Initial load ---
+            showList();
         })();
     </script>
 </body>