diff --git a/TODO.md b/TODO.md
index fc2776c..923ef27 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,48 +1,4 @@
 # TODO
 
-## Done
-- [x] Move CSV import from standalone import.php to inline dialog on the list page
-  - [x] Import logic embedded in index.php (processed before render)
-  - [x] `<dialog>` with form, results log, and auto-opens on post-submit
-  - [x] "Importer un CSV" button in list header row next to h1
-  - [x] Nav link to import.php removed; import.php now redirects to /admin/
-  - [x] CSS: `.admin-dialog`, `.admin-list-header`, `.admin-import-log`
-- [x] Create Paramètres page consolidating maintenance toggle and account settings into two sections
-  - [x] New `public/admin/parametres.php` with Maintenance + Compte administrateur sections
-  - [x] Nav updated: “Compte” replaced by “Paramètres” linking to `parametres.php`
-  - [x] Maintenance bar removed from `index.php`
-  - [x] `actions/maintenance.php` and `actions/account.php` redirect to `parametres.php` via POST `redirect` param
-  - [x] CSS added for `.admin-settings-section` and `.admin-maintenance-status`
-- [x] Fix nav logo: revert to "Xamxam", apply display font (Combined), step-2 size, letter-spacing, text-shadow via .nav-logo class
-- [x] Bump all font sizes ~10% across all CSS files (admin, system, search, main, apropos, common, tfe)
-- [x] Migrate to utopia fluid type scale (--step--2 → --step-5) and space scale (--space-3xs → --space-3xl) across all CSS files
-- [x] Split search logic into search.php
-  - [x] `public/search.php` — new page for text-query search results
-  - [x] `public/repertoire.php` — stripped to répertoire index only
-  - [x] `SearchController::handle()` split into `handleSearch()` + `handleRepertoire()`
-  - [x] Search bar (`header.php`, `search-bar.php`) now POSTs to `/search.php`
-  - [x] `tfe.php` `?query=` links updated to `/search.php`
-  - [x] Filter links (`?or[]=`, `?ap[]=`, `?fy[]=`, `?kw[]=`) stay on `repertoire.php`
-- [x] TFE metadata values are hyperlinks to repertoire.php with correct filter/search params
-  - orientation → `or[]`, ap_program → `ap[]`, year → `fy[]`, keywords → `kw[]` (per keyword)
-  - languages, formats → `query=` (text search); jury members → `query=` (text search)
-  - access_type, license_type, file_size_info, context_note, baiu_link remain plain text/links as-is
-- [x] Fix TFE page gradient bleed & layout collapse
-  - [x] Scope `header` nav CSS in common.css to `body > header` (prevents article `<header>` inheriting gradient)
-  - [x] Add `width: 100%` + `align-items: start` to `.tfe-layout` grid
-  - [x] Remove `overflow-y: auto` from `.tfe-main` (was clipping layout)
-- [x] Redesign TFE detail page
-  - [x] Author moved above title (smaller body font)
-  - [x] Remove "← Retour" back link
-  - [x] Split jury promoteurs into interne/externe using `getThesisJury()`
-  - [x] Jury fields order: promoteur interne → externe → président → lecteurs
-  - [x] Contact URL strips `http(s)://` prefix for display
-  - [x] Right-column images get `border-radius: 8px`
-  - [x] Remove orphan `.tfe-back-link` CSS rule
-- [x] Improve À propos page layout
-  - [x] Replace two-column (prose + aside) with sticky-TOC-nav + main-content layout
-  - [x] Sticky left nav with section anchors (À propos, Contacts, Crédits + erg link)
-  - [x] Contacts rendered as bordered rows instead of loose address blocks
-  - [x] Credits rendered as `<dl>` grid with label/value rows
-  - [x] Section dividers (border-bottom) between sections
-  - [x] Responsive: TOC collapses to horizontal bar on mobile
+## Fixes
+- [x] Replace `mb_strlen`/`mb_substr` with `strlen`/`substr` in TfeController, SearchController, Parsedown — mbstring extension not available on production server
diff --git a/src/Parsedown.php b/src/Parsedown.php
index 2f01d5c..4349421 100644
--- a/src/Parsedown.php
+++ b/src/Parsedown.php
@@ -185,7 +185,7 @@ class Parsedown
 
             while (($beforeTab = strstr($line, "\t", true)) !== false)
             {
-                $shortage = 4 - mb_strlen($beforeTab, 'utf-8') % 4;
+                $shortage = 4 - strlen($beforeTab) % 4;
 
                 $line = $beforeTab
                     . str_repeat(' ', $shortage)
diff --git a/src/SearchController.php b/src/SearchController.php
index a474ff6..d837ed0 100644
--- a/src/SearchController.php
+++ b/src/SearchController.php
@@ -211,7 +211,7 @@ class SearchController
             $out = [];
             foreach ($raw as $v) {
                 $v = trim((string)$v);
-                if ($v !== '' && mb_strlen($v) <= $maxLen) {
+                if ($v !== '' && strlen($v) <= $maxLen) {
                     $out[] = $v;
                 }
             }
diff --git a/src/TfeController.php b/src/TfeController.php
index 149cc92..e9b5d0e 100644
--- a/src/TfeController.php
+++ b/src/TfeController.php
@@ -126,8 +126,8 @@ class TfeController
             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) . '…'
+        return strlen($plain) > self::META_MAX_LEN
+            ? substr($plain, 0, self::META_MAX_LEN - 3) . '…'
             : $plain;
     }