diff --git a/TODO.md b/TODO.md
index 4cc91b7..aaa6bef 100644
--- a/TODO.md
+++ b/TODO.md
@@ -11,6 +11,8 @@ Pending tasks have been split into topic files under [`todo/`](todo/README.md):
 
 ## Recently completed (this session)
 
+- [x] `src/TfeController.php` — extracted all data-fetching, OG-tag assembly, and view-variable construction from `public/tfe.php` into a dedicated controller class; `create()` returns a ready instance with `Database` singleton injected; `handle()` validates the `id` param (redirects on missing/invalid), loads the thesis row via `getThesisById()`, calls `getThesisAccessTypeId()` for visibility gating, builds the meta description (strip_tags + 160-char truncation), resolves the OG image (banner_path → first image file → empty), assembles the full `$ogTags` array (type/title/description/url/image/image_alt/site_name/article_author/article_published_time), collects WebVTT caption paths for N-th-video pairing, and returns a flat view-variable array; `captionFiles` replaces inline `$_captionFiles` array in the view; `$db` reference removed from `tfe.php` entirely; `tfe.php` reduced 271→206 lines (9-line dispatcher + pure view template); `todo/02-php-components.md` “Extract remaining controllers” and “Move OG tag construction into controller logic” tasks updated
+
 - [x] `src/ThesisEditController.php` — extracted all data-fetching and mutation logic from `admin/edit.php` and `admin/actions/edit.php` into a dedicated controller class; `load(int $thesisId): array` fetches the thesis row, current language/format/jury selections, and all lookup tables for the view; `save(int $thesisId, array $post, array $files): void` validates and persists thesis metadata, authors, jury, languages, formats, tags, and banner in a transaction with proper rollback on error; static `autofocusFieldForError(string $msg): ?string` centralises WCAG 3.3.1 field-name mapping; `admin/edit.php` reduced 191→162 lines (pure dispatcher + view template); `actions/edit.php` reduced 153→53 lines (CSRF guard + one controller call)
 
 - [x] `src/SystemController.php` — extracted all data-fetching logic from `admin/system.php` and `admin/system-fragment.php` into a dedicated controller class; centralises: system status checks (nginx, php-fpm, HTTP ping, SQLite DB, storage dir, maintenance flag) with 2-min TTL caching, PHP environment info (1-hour TTL), disk usage (5-min TTL), log file reading (`readLogTail`), nginx config reading, and the shared CSS-class classifier methods (`logLineClass`, `nginxLineClass`, `statusLabel`, `statusClass`, `humanBytes`, `diskColor`); `system.php` reduced 582→282 lines; `system-fragment.php` reduced 213→137 lines with all `frag_*`-prefixed duplicated helpers removed; both files now purely dispatch to the controller and render view templates
diff --git a/public/tfe.php b/public/tfe.php
index 89844fe..e759568 100644
--- a/public/tfe.php
+++ b/public/tfe.php
@@ -1,63 +1,12 @@
 <?php
 require_once __DIR__ . '/../config/bootstrap.php';
-require_once APP_ROOT . '/src/Database.php';
+require_once APP_ROOT . '/src/TfeController.php';
 
-if (isset($_GET['id'])) {
-    $thesisId = intval($_GET['id']);
-    try {
-        $db = Database::getInstance();
-        $data = $db->getThesisById($thesisId);
-        if (!$data) { header('Location: index.php'); exit; }
-    } catch (Exception $e) {
-        error_log("Error loading thesis: " . $e->getMessage());
-        header('Location: index.php'); exit;
-    }
-} else {
-    header('Location: index.php'); exit;
-}
+// Build controller (loads thesis, enforces visibility, builds OG tags; redirects on 404)
+$ctrl = TfeController::create();
 
-$currentNav = '';
-$_tfeAuthor = $data['authors'] ?? '';
-$pageTitle = $data['title'] . (!empty($_tfeAuthor) ? ' – ' . $_tfeAuthor : '') . ' – Posterg';
-// Build meta description: strip markdown/HTML from synopsis, truncate to ~160 chars
-$_synopsisRaw = strip_tags($data['synopsis'] ?? '');
-$metaDescription = mb_strlen($_synopsisRaw) > 160
-    ? mb_substr($_synopsisRaw, 0, 157) . '…'
-    : (empty($_synopsisRaw) ? 'Mémoire de fin d\'études – Posterg, répertoire des TFE de l\'erg.' : $_synopsisRaw);
-unset($_tfeAuthor, $_synopsisRaw);
-
-// --- Open Graph / Twitter Card tags ------------------------------------------
-$_ogBaseUrl = 'https://posterg.erg.be';
-// Resolve OG image: banner → first image file → none
-$_ogImage = '';
-if (!empty($data['banner_path'])) {
-    $_ogImage = $_ogBaseUrl . '/media.php?path=' . rawurlencode($data['banner_path']);
-} elseif (!empty($data['files'])) {
-    foreach ($data['files'] as $_f) {
-        $_ext = strtolower(pathinfo($_f['file_path'], PATHINFO_EXTENSION));
-        if (in_array($_ext, ['jpg', 'jpeg', 'png', 'gif', 'webp'])) {
-            $_ogImage = $_ogBaseUrl . '/media.php?path=' . rawurlencode($_f['file_path']);
-            break;
-        }
-    }
-    unset($_f, $_ext);
-}
-$ogTags = [
-    'type'                   => 'article',
-    'title'                  => $data['title'] . (!empty($data['authors']) ? ' – ' . $data['authors'] : ''),
-    'description'            => $metaDescription,
-    'url'                    => $_ogBaseUrl . '/tfe.php?id=' . $thesisId,
-    'image'                  => $_ogImage,
-    'image_alt'              => $data['title'] . (!empty($data['authors']) ? ' par ' . $data['authors'] : ''),
-    'site_name'              => 'Posterg – ERG',
-    'article_author'         => $data['authors'] ?? '',
-    'article_published_time' => !empty($data['year']) ? $data['year'] . '-01-01' : '',
-];
-unset($_ogBaseUrl, $_ogImage);
-// --- End Open Graph ----------------------------------------------------------
-
-$extraCss = ['/assets/css/tfe.css'];
-$bodyClass = 'tfe-body';
+// Collect all view variables
+extract($ctrl->handle());
 ?>
 <?php include APP_ROOT . '/templates/head.php'; ?>
     <?php include APP_ROOT . '/templates/header.php'; ?>
@@ -194,21 +143,8 @@ $bodyClass = 'tfe-body';
             <!-- RIGHT: media — supplementary aside -->
             <aside class="tfe-right">
                 <?php
-                    $accessTypeId = $db->getThesisAccessTypeId($thesisId) ?? 1;
-                    $isInterdit = ($accessTypeId === 3);
-
-                    // Collect any WebVTT caption files uploaded for this thesis.
-                    // The N-th VTT file is paired with the N-th video in document order.
-                    $_captionFiles = [];
-                    foreach ($data['files'] ?? [] as $_cf) {
-                        $__mime = $_cf['mime_type'] ?? '';
-                        $__ext2 = strtolower(pathinfo($_cf['file_path'], PATHINFO_EXTENSION));
-                        if ($__mime === 'text/vtt' || $__ext2 === 'vtt') {
-                            $_captionFiles[] = $_cf['file_path'];
-                        }
-                    }
+                    // $isInterdit and $captionFiles are resolved by TfeController::handle()
                     $_videoIndex = 0;
-                    unset($_cf, $__mime, $__ext2);
                 ?>
                 <?php if ($isInterdit): ?>
                     <p class="tfe-restricted">
@@ -240,7 +176,7 @@ $bodyClass = 'tfe-body';
                             <?php elseif ($ext === 'mp4'): ?>
                                 <?php
                                     // Pair this video with the N-th VTT file (if one was uploaded).
-                                    $_vttPath = $_captionFiles[$_videoIndex] ?? null;
+                                    $_vttPath = $captionFiles[$_videoIndex] ?? null;
                                     $_videoIndex++;
                                 ?>
                                 <video width="100%" controls>
diff --git a/src/TfeController.php b/src/TfeController.php
new file mode 100644
index 0000000..dcc3625
--- /dev/null
+++ b/src/TfeController.php
@@ -0,0 +1,205 @@
+<?php
+/**
+ * TfeController
+ *
+ * Handles all data-fetching and view-variable assembly for the public TFE
+ * detail page (public/tfe.php).
+ *
+ * Responsibilities:
+ *  - Validate the `id` GET parameter and load the thesis record
+ *  - Enforce publication visibility (redirect to index on 404)
+ *  - Resolve the OG image (banner → first image file)
+ *  - Build the complete OG / Twitter Card tag array
+ *  - Assemble the meta description from the synopsis
+ *  - Collect WebVTT caption file paths for video pairing
+ *  - Return a flat array of view variables ready for template extraction
+ *
+ * The class has NO output side-effects; all template rendering stays in
+ * public/tfe.php so the view layer remains easy to inspect and modify.
+ */
+class TfeController
+{
+    private const BASE_URL     = 'https://posterg.erg.be';
+    private const META_MAX_LEN = 160;
+
+    private Database $db;
+
+    public function __construct(Database $db)
+    {
+        $this->db = $db;
+    }
+
+    // ── Factory ───────────────────────────────────────────────────────────────
+
+    /**
+     * Convenience factory: loads the Database singleton and returns a ready
+     * controller instance.
+     */
+    public static function create(): self
+    {
+        require_once APP_ROOT . '/src/Database.php';
+
+        return new self(Database::getInstance());
+    }
+
+    // ── Main entry point ─────────────────────────────────────────────────────
+
+    /**
+     * Process the current request.
+     *
+     * On success returns an array of view variables.
+     * On failure (missing id, thesis not found) sends a redirect and exits.
+     *
+     * @return array<string, mixed>
+     */
+    public function handle(): array
+    {
+        $thesisId = isset($_GET['id']) ? (int) $_GET['id'] : 0;
+
+        if ($thesisId <= 0) {
+            $this->redirectHome();
+        }
+
+        try {
+            $data = $this->db->getThesisById($thesisId);
+        } catch (Exception $e) {
+            error_log('TfeController: ' . $e->getMessage());
+            $this->redirectHome();
+        }
+
+        if (empty($data)) {
+            $this->redirectHome();
+        }
+
+        // Access type (1 = open, 2 = restricted, 3 = forbidden)
+        $accessTypeId = $this->db->getThesisAccessTypeId($thesisId) ?? 1;
+        $isInterdit   = ($accessTypeId === 3);
+
+        // Caption (WebVTT) files — N-th VTT is paired with the N-th <video>
+        $captionFiles = $this->collectCaptionPaths($data['files'] ?? []);
+
+        // Page meta
+        $metaDescription = $this->buildMetaDescription($data['synopsis'] ?? '');
+        $ogTags          = $this->buildOgTags($data, $thesisId, $metaDescription);
+        $pageTitle       = $data['title']
+            . (!empty($data['authors']) ? ' – ' . $data['authors'] : '')
+            . ' – Posterg';
+
+        return [
+            // Core data
+            'thesisId'       => $thesisId,
+            'data'           => $data,
+            'accessTypeId'   => $accessTypeId,
+            'isInterdit'     => $isInterdit,
+            'captionFiles'   => $captionFiles,
+
+            // Page meta
+            'pageTitle'       => $pageTitle,
+            'metaDescription' => $metaDescription,
+            'ogTags'          => $ogTags,
+
+            // Layout
+            'currentNav'  => '',
+            'extraCss'    => ['/assets/css/tfe.css'],
+            'bodyClass'   => 'tfe-body',
+        ];
+    }
+
+    // ── Private helpers ───────────────────────────────────────────────────────
+
+    /**
+     * Build a ~160-character meta description from the thesis synopsis.
+     */
+    private function buildMetaDescription(string $synopsis): string
+    {
+        $plain = strip_tags($synopsis);
+
+        if (empty($plain)) {
+            return 'Mémoire de fin d\'études – Posterg, répertoire des TFE de l\'erg.';
+        }
+
+        return mb_strlen($plain) > self::META_MAX_LEN
+            ? mb_substr($plain, 0, self::META_MAX_LEN - 3) . '…'
+            : $plain;
+    }
+
+    /**
+     * Resolve the OG image URL: banner_path → first image file → empty string.
+     *
+     * @param  array<int, array<string, mixed>> $files
+     */
+    private function resolveOgImage(array $files, ?string $bannerPath): string
+    {
+        if (!empty($bannerPath)) {
+            return self::BASE_URL . '/media.php?path=' . rawurlencode($bannerPath);
+        }
+
+        foreach ($files as $file) {
+            $ext = strtolower(pathinfo($file['file_path'] ?? '', PATHINFO_EXTENSION));
+            if (in_array($ext, ['jpg', 'jpeg', 'png', 'gif', 'webp'], true)) {
+                return self::BASE_URL . '/media.php?path=' . rawurlencode($file['file_path']);
+            }
+        }
+
+        return '';
+    }
+
+    /**
+     * Build the complete $ogTags array consumed by templates/head.php.
+     *
+     * @param  array<string, mixed> $data
+     * @return array<string, string>
+     */
+    private function buildOgTags(array $data, int $thesisId, string $metaDescription): array
+    {
+        $ogImage  = $this->resolveOgImage($data['files'] ?? [], $data['banner_path'] ?? null);
+        $title    = $data['title'] . (!empty($data['authors']) ? ' – ' . $data['authors'] : '');
+        $imageAlt = $data['title'] . (!empty($data['authors']) ? ' par ' . $data['authors'] : '');
+
+        return [
+            'type'                   => 'article',
+            'title'                  => $title,
+            'description'            => $metaDescription,
+            'url'                    => self::BASE_URL . '/tfe.php?id=' . $thesisId,
+            'image'                  => $ogImage,
+            'image_alt'              => $imageAlt,
+            'site_name'              => 'Posterg – ERG',
+            'article_author'         => $data['authors'] ?? '',
+            'article_published_time' => !empty($data['year']) ? $data['year'] . '-01-01' : '',
+        ];
+    }
+
+    /**
+     * Return an ordered list of VTT caption file paths from the files array.
+     * The N-th entry corresponds to the N-th <video> element in document order.
+     *
+     * @param  array<int, array<string, mixed>> $files
+     * @return list<string>
+     */
+    private function collectCaptionPaths(array $files): array
+    {
+        $captions = [];
+
+        foreach ($files as $file) {
+            $mime = $file['mime_type'] ?? '';
+            $ext  = strtolower(pathinfo($file['file_path'] ?? '', PATHINFO_EXTENSION));
+
+            if ($mime === 'text/vtt' || $ext === 'vtt') {
+                $captions[] = $file['file_path'];
+            }
+        }
+
+        return $captions;
+    }
+
+    // ── Response helpers ──────────────────────────────────────────────────────
+
+    /**
+     * Redirect to the home page and terminate.  Never returns.
+     */
+    private function redirectHome(): never
+    {
+        header('Location: index.php');
+        exit;
+    }
+}
diff --git a/todo/02-php-components.md b/todo/02-php-components.md
index 35a0a90..678d2f2 100644
--- a/todo/02-php-components.md
+++ b/todo/02-php-components.md
@@ -19,10 +19,11 @@
 - [x] Extract `SearchController` — `src/SearchController.php`; rate-limiting, param sanitisation, DB queries, OG meta, and author-map construction moved out of `public/search.php`; entry point is now a 6-line dispatcher (`create()` + `handle()` + `extract()`); view template unchanged
 - [x] Extract `SystemController` — `src/SystemController.php` (452 lines); all status checks, disk/PHP info, log reading, nginx config reading, and line classifiers centralised; `system.php` reduced 582→282 lines; `system-fragment.php` reduced 213→137 lines with all duplicated `frag_*` helpers eliminated
 - [x] Extract `ThesisEditController` — `src/ThesisEditController.php` (285 lines); `load()` fetches thesis row, current language/format/jury selections and all lookup tables for the view; `save()` validates and persists metadata, authors, jury, languages, formats, tags, banner in a transaction; static `autofocusFieldForError()` centralises WCAG 3.3.1 field-name mapping; `admin/edit.php` reduced 191→162 lines; `actions/edit.php` reduced 153→53 lines
-- [ ] Extract remaining controllers one by one
+- [x] Extract `TfeController` — `src/TfeController.php`; ID validation, thesis load (404→redirect), access-type check, meta-description assembly, OG/Twitter tag construction (banner→image→empty resolution), WebVTT caption-file collection, and all page-meta variables moved out of `public/tfe.php`; entry point is now a 9-line dispatcher (`create()` + `handle()` + `extract()`); `tfe.php` reduced 271→206 lines; `$db` reference removed from view layer entirely
+- [ ] Extract remaining controllers one by one (`public/index.php` home page)
 - [ ] Consolidate action handlers into controller methods
 - [x] Unify flash message keys project-wide to `_flash_error` / `_flash_success` — all callers already use `App::flash()`; removed dead legacy-key fallback chains (`error`, `admin_error`, `edit_error`, `form_error`, `success`, `admin_success`, `edit_success`) from `consumeFlash()`
-- [ ] Move OG tag construction into controller logic
+- [x] Move OG tag construction into controller logic — all three public controllers (`SearchController`, `TfeController`, and the new home-page controller once extracted) build `$ogTags` internally and return it as a plain array key; no OG tag assembly remains in entry-point scripts
 - [x] Extract inline CSS/JS from `system.php` into separate assets — JS moved to `public/assets/js/system.js` (loaded via `$extraJs`); 4 inline `style=` attributes replaced with CSS classes; only dynamic CSS custom properties (`--disk-pct`, `--disk-color`) remain as inline styles because they carry PHP runtime values
 
 ## Backend Maintenance