diff --git a/TODO.md b/TODO.md
index 09ab492..de69c4f 100644
--- a/TODO.md
+++ b/TODO.md
@@ -347,7 +347,7 @@ Goal: rename the tables and column to the canonical M2M pattern (`tags`, `thesis
 
 ### A — SQLite / Query performance
 
-- [ ] **WAL mode** — set `PRAGMA journal_mode = WAL` and `PRAGMA synchronous = NORMAL` in `Database::__construct()` after `foreign_keys = ON`.
+- [x] **WAL mode** — set `PRAGMA journal_mode = WAL` and `PRAGMA synchronous = NORMAL` in `Database::__construct()` after `foreign_keys = ON`.
       Eliminates full-database read-locks on every write; makes concurrent PHP-FPM workers safe.
       Also add `PRAGMA cache_size = -8000` (≈8 MB page cache) while there.
 
@@ -1308,27 +1308,14 @@ Current state: **zero ARIA attributes, zero skip links, zero focus-visible style
 
 These are things that must be added once and apply everywhere:
 
-- [ ] **Add `.sr-only` utility class to `common.css`** — needed for skip links, visually-hidden
-      labels, and screen-reader-only context text referenced throughout this audit:
-      ```css
-      .sr-only {
-        position: absolute;
-        width: 1px;
-        height: 1px;
-        padding: 0;
-        margin: -1px;
-        overflow: hidden;
-        clip: rect(0,0,0,0);
-        white-space: nowrap;
-        border: 0;
-      }
-      ```
+- [x] **Add `.sr-only` utility class to `common.css`** — needed for skip links, visually-hidden
+      labels, and screen-reader-only context text referenced throughout this audit.
 
-- [ ] **Add skip-to-content link in all page templates** — as described in 2.4.1 above. This
-      one change has the highest impact-per-line-of-code ratio of any item in this audit.
+- [x] **Add skip-to-content link in all page templates** — added to all 5 public pages and
+      admin head template; `id="main-content"` added to every `<main>` in the codebase.
 
-- [ ] **Add global `:focus-visible` rule in `common.css` and `admin.css`** — as described in
-      2.4.7. Second highest impact item.
+- [x] **Add global `:focus-visible` rule in `common.css` and `admin.css`** — consistent
+      2px purple outline with 2px offset; `prefers-reduced-motion` guard also added.
 
-- [ ] **Remove all `outline: none` declarations that have no replacement focus style** —
-      `common.css:125`, `admin.css:121`, `admin.css:323`, `search.css:241`.
+- [x] **Remove all `outline: none` declarations that have no replacement focus style** —
+      removed from `common.css`, `admin.css` (×2), and `search.css`.
diff --git a/public/admin/account.php b/public/admin/account.php
index d60af2f..c203ef9 100644
--- a/public/admin/account.php
+++ b/public/admin/account.php
@@ -18,7 +18,7 @@ if (empty($_SESSION['csrf_token'])) {
 ?>
 <?php require_once APP_ROOT . '/templates/admin/head.php'; ?>
 
-<main class="admin-main">
+<main class="admin-main" id="main-content">
     <h1 class="admin-page-title">Compte administrateur</h1>
 
     <?php if ($error): ?>
diff --git a/public/admin/add.php b/public/admin/add.php
index a853187..175ac7d 100644
--- a/public/admin/add.php
+++ b/public/admin/add.php
@@ -41,7 +41,7 @@ function wasSelected($key, $value) {
 ?>
 <?php require_once APP_ROOT . '/templates/admin/head.php'; ?>
 
-<main class="admin-main">
+<main class="admin-main" id="main-content">
     <h1 class="admin-page-title">Ajouter un TFE</h1>
 
     <?php if ($error): ?>
diff --git a/public/admin/edit.php b/public/admin/edit.php
index 1562721..a295d3c 100644
--- a/public/admin/edit.php
+++ b/public/admin/edit.php
@@ -234,7 +234,7 @@ try {
 ?>
 <?php require_once APP_ROOT . '/templates/admin/head.php'; ?>
 
-<main class="admin-main">
+<main class="admin-main" id="main-content">
     <h1 class="admin-page-title">Modifier un TFE</h1>
 
     <?php if ($error): ?>
diff --git a/public/admin/import.php b/public/admin/import.php
index 1231882..10ed528 100644
--- a/public/admin/import.php
+++ b/public/admin/import.php
@@ -279,7 +279,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_FILES['csv_file'])) {
 ?>
 <?php require_once APP_ROOT . '/templates/admin/head.php'; ?>
 
-<main class="admin-main">
+<main class="admin-main" id="main-content">
     <h1 class="admin-page-title">Importer une liste de TFE</h1>
 
     <?php if (!empty($errors)): ?>
diff --git a/public/admin/index.php b/public/admin/index.php
index 881a644..e99cad0 100644
--- a/public/admin/index.php
+++ b/public/admin/index.php
@@ -62,7 +62,7 @@ document.addEventListener('DOMContentLoaded', () => {
 });
 </script>
 
-<main class="admin-main">
+<main class="admin-main" id="main-content">
     <h1 class="admin-page-title">Liste des TFE</h1>
 
     <?php if (isset($_SESSION['error'])): ?>
diff --git a/public/admin/pages-edit.php b/public/admin/pages-edit.php
index df999c7..5bfd8db 100644
--- a/public/admin/pages-edit.php
+++ b/public/admin/pages-edit.php
@@ -33,7 +33,7 @@ $pageTitle = "Éditer : " . htmlspecialchars($page['title']);
 
 <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/easymde/dist/easymde.min.css">
 
-<main class="admin-main">
+<main class="admin-main" id="main-content">
     <h1 class="admin-page-title">Éditer : <?= htmlspecialchars($page['title']) ?></h1>
 
     <form action="/admin/actions/page.php" method="post" class="admin-form">
diff --git a/public/admin/pages.php b/public/admin/pages.php
index 7f01879..904080c 100644
--- a/public/admin/pages.php
+++ b/public/admin/pages.php
@@ -20,7 +20,7 @@ unset($_SESSION['success']);
 ?>
 <?php require_once APP_ROOT . '/templates/admin/head.php'; ?>
 
-<main class="admin-main">
+<main class="admin-main" id="main-content">
     <h1 class="admin-page-title">Pages statiques</h1>
 
     <?php if ($success): ?>
diff --git a/public/admin/system.php b/public/admin/system.php
index a8b12d2..ce58af3 100644
--- a/public/admin/system.php
+++ b/public/admin/system.php
@@ -601,7 +601,7 @@ require_once APP_ROOT . '/templates/admin/head.php';
 .nginx-location { color: #79dac8; }
 </style>
 
-<main class="admin-main">
+<main class="admin-main" id="main-content">
     <h1 class="admin-page-title">Système</h1>
 
     <p class="sys-refresh-note">
diff --git a/public/admin/tags.php b/public/admin/tags.php
index 235270b..f668022 100644
--- a/public/admin/tags.php
+++ b/public/admin/tags.php
@@ -24,7 +24,7 @@ unset($_SESSION['admin_error'], $_SESSION['admin_success']);
 ?>
 <?php require_once APP_ROOT . '/templates/admin/head.php'; ?>
 
-<main class="admin-main">
+<main class="admin-main" id="main-content">
     <h1 class="admin-page-title">Mots-clés (<?= count($tags) ?>)</h1>
 
     <?php if ($error): ?>
diff --git a/public/admin/thanks.php b/public/admin/thanks.php
index bd37dce..0e51e31 100644
--- a/public/admin/thanks.php
+++ b/public/admin/thanks.php
@@ -73,7 +73,7 @@ $pageTitle = "Récapitulatif TFE";
 ?>
 <?php require_once APP_ROOT . '/templates/admin/head.php'; ?>
 
-<main class="admin-main">
+<main class="admin-main" id="main-content">
     <h1 class="admin-page-title">Récapitulatif TFE</h1>
 
     <?php if ($error): ?>
diff --git a/public/apropos.php b/public/apropos.php
index f5f5758..6755582 100644
--- a/public/apropos.php
+++ b/public/apropos.php
@@ -46,11 +46,12 @@ $aboutHtml = $pd->text($rawContent);
     <?php endif; ?>
 </head>
 <body class="apropos-body">
+    <a href="#main-content" class="skip-link">Aller au contenu principal</a>
 
     <?php include APP_ROOT . '/templates/nav.php'; ?>
     <?php include APP_ROOT . '/templates/search-bar.php'; ?>
 
-    <main class="apropos-main">
+    <main class="apropos-main" id="main-content">
         <div class="apropos-layout">
 
             <!-- LEFT: main text (from DB, Markdown-rendered) -->
diff --git a/public/assets/admin.css b/public/assets/admin.css
index 1c8e048..f9f83d5 100644
--- a/public/assets/admin.css
+++ b/public/assets/admin.css
@@ -118,7 +118,6 @@ html, body {
   font-size: 0.92rem;
   font-family: inherit;
   padding: 0.4rem 0;
-  outline: none;
   border-radius: 0;
   transition: border-color 0.15s;
   -webkit-appearance: none;
@@ -320,7 +319,6 @@ html, body {
   font-size: 0.88rem;
   font-family: inherit;
   padding: 0.45rem 0.75rem;
-  outline: none;
   cursor: pointer;
 }
 
@@ -808,3 +806,42 @@ html, body {
   font-size: 0.9rem;
   line-height: 1.5;
 }
+
+/* ============================================================
+   ACCESSIBILITY UTILITIES
+   ============================================================ */
+
+/* Consistent keyboard-focus outline for admin interactive elements */
+:focus-visible {
+  outline: 2px solid var(--admin-purple);
+  outline-offset: 2px;
+}
+
+/* Skip-to-admin-content link */
+.skip-link {
+  position: absolute;
+  top: -999px;
+  left: 1rem;
+  z-index: 9999;
+  padding: 0.5rem 1rem;
+  background: var(--admin-purple);
+  color: #fff;
+  font-size: 0.9rem;
+  font-weight: 600;
+  text-decoration: none;
+  border-radius: 0 0 4px 4px;
+}
+
+.skip-link:focus {
+  top: 0;
+}
+
+/* Respect user motion preferences */
+@media (prefers-reduced-motion: reduce) {
+  *,
+  *::before,
+  *::after {
+    transition-duration: 0.01ms !important;
+    animation-duration: 0.01ms !important;
+  }
+}
diff --git a/public/assets/common.css b/public/assets/common.css
index 1104d3d..5ce5329 100644
--- a/public/assets/common.css
+++ b/public/assets/common.css
@@ -122,7 +122,6 @@ a:hover {
 .site-search__input {
   flex: 1;
   border: none;
-  outline: none;
   font-size: 0.95rem;
   color: var(--black);
   background: transparent;
@@ -133,3 +132,55 @@ a:hover {
 .site-search__input::placeholder {
   color: #aaa;
 }
+
+/* ============================================================
+   ACCESSIBILITY UTILITIES
+   ============================================================ */
+
+/* Visually-hidden but screen-reader-accessible */
+.sr-only {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  padding: 0;
+  margin: -1px;
+  overflow: hidden;
+  clip: rect(0, 0, 0, 0);
+  white-space: nowrap;
+  border: 0;
+}
+
+/* Skip-to-content link (visible only on keyboard focus) */
+.skip-link {
+  position: absolute;
+  top: -999px;
+  left: 1rem;
+  z-index: 9999;
+  padding: 0.5rem 1rem;
+  background: var(--purple);
+  color: var(--white);
+  font-size: 0.9rem;
+  font-weight: 600;
+  text-decoration: none;
+  border-radius: 0 0 4px 4px;
+}
+
+.skip-link:focus {
+  top: 0;
+}
+
+/* Consistent keyboard-focus outline for all interactive elements */
+:focus-visible {
+  outline: 2px solid var(--purple);
+  outline-offset: 2px;
+}
+
+/* Respect user motion preferences */
+@media (prefers-reduced-motion: reduce) {
+  *,
+  *::before,
+  *::after {
+    transition-duration: 0.01ms !important;
+    animation-duration: 0.01ms !important;
+  }
+}
diff --git a/public/assets/search.css b/public/assets/search.css
index 1d08c1a..3caa90f 100644
--- a/public/assets/search.css
+++ b/public/assets/search.css
@@ -238,7 +238,6 @@ html, body {
   padding: 0.2rem 0.5rem;
   background: var(--white);
   color: var(--black);
-  outline: none;
   font-family: inherit;
   cursor: pointer;
 }
diff --git a/public/index.php b/public/index.php
index ae3e5fd..222fc77 100644
--- a/public/index.php
+++ b/public/index.php
@@ -82,6 +82,7 @@ $currentNav = '';
     <?php endif; ?>
 </head>
 <body class="home-body">
+    <a href="#main-content" class="skip-link">Aller au contenu principal</a>
 
     <?php include APP_ROOT . '/templates/nav.php'; ?>
     <?php include APP_ROOT . '/templates/search-bar.php'; ?>
@@ -97,7 +98,7 @@ $currentNav = '';
     </div>
     <?php endif; ?>
 
-    <main class="home-main">
+    <main class="home-main" id="main-content">
         <div class="cards-container">
             <?php foreach ($itemsToLoad as $item): ?>
                 <a href="tfe.php?id=<?= (int)$item["id"] ?>" class="card-link">
diff --git a/public/licence.php b/public/licence.php
index a02ad5a..6e4bee2 100644
--- a/public/licence.php
+++ b/public/licence.php
@@ -41,11 +41,12 @@ $html = $pd->text($content);
     <?php endif; ?>
 </head>
 <body class="apropos-body">
+    <a href="#main-content" class="skip-link">Aller au contenu principal</a>
 
     <?php include APP_ROOT . '/templates/nav.php'; ?>
     <?php include APP_ROOT . '/templates/search-bar.php'; ?>
 
-    <main class="apropos-main">
+    <main class="apropos-main" id="main-content">
         <div class="apropos-layout">
             <div class="apropos-left">
                 <div class="apropos-description apropos-page-content">
diff --git a/public/search.php b/public/search.php
index 5909088..4e22096 100644
--- a/public/search.php
+++ b/public/search.php
@@ -83,6 +83,7 @@ $searchBarValue = $_GET['query'] ?? '';
     <?php endif; ?>
 </head>
 <body class="search-body">
+    <a href="#main-content" class="skip-link">Aller au contenu principal</a>
 
     <?php include APP_ROOT . '/templates/nav.php'; ?>
     <?php include APP_ROOT . '/templates/search-bar.php'; ?>
@@ -140,7 +141,7 @@ $searchBarValue = $_GET['query'] ?? '';
         <a href="search.php" class="search-reset-link">Réinitialiser</a>
     </form>
 
-    <main class="search-main">
+    <main class="search-main" id="main-content">
         <div class="search-results-view">
             <p class="search-results-header"><?= $totalItems ?> résultat<?= $totalItems > 1 ? 's' : '' ?></p>
 
@@ -173,7 +174,7 @@ $searchBarValue = $_GET['query'] ?? '';
 
     <?php else: ?>
     <!-- ── RÉPERTOIRE INDEX VIEW ─────────────────────────── -->
-    <main class="search-main">
+    <main class="search-main" id="main-content">
         <div class="repertoire-index">
 
             <!-- ANNÉES -->
diff --git a/public/tfe.php b/public/tfe.php
index 9e44183..27e0304 100644
--- a/public/tfe.php
+++ b/public/tfe.php
@@ -39,11 +39,12 @@ $currentNav = '';
     <?php endif; ?>
 </head>
 <body class="tfe-body">
+    <a href="#main-content" class="skip-link">Aller au contenu principal</a>
 
     <?php include APP_ROOT . '/templates/nav.php'; ?>
     <?php include APP_ROOT . '/templates/search-bar.php'; ?>
 
-    <main class="tfe-main">
+    <main class="tfe-main" id="main-content">
         <div class="tfe-layout">
 
             <!-- LEFT: info -->
diff --git a/src/Database.php b/src/Database.php
index d7e8b04..173d97f 100644
--- a/src/Database.php
+++ b/src/Database.php
@@ -24,8 +24,11 @@ class Database {
             $this->pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
             $this->pdo->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
 
-            // Enable foreign key constraints
+            // Enable foreign key constraints + performance pragmas
             $this->pdo->exec('PRAGMA foreign_keys = ON');
+            $this->pdo->exec('PRAGMA journal_mode = WAL');
+            $this->pdo->exec('PRAGMA synchronous = NORMAL');
+            $this->pdo->exec('PRAGMA cache_size = -8000');
         } catch (PDOException $e) {
             error_log("Database connection failed: " . $e->getMessage());
             throw new Exception("Impossible de se connecter à la base de données.");
diff --git a/src/cache/rate_limit/ad921d60486366258809553a3db49a4a.json b/src/cache/rate_limit/ad921d60486366258809553a3db49a4a.json
index 196b222..a2b2955 100644
--- a/src/cache/rate_limit/ad921d60486366258809553a3db49a4a.json
+++ b/src/cache/rate_limit/ad921d60486366258809553a3db49a4a.json
@@ -1 +1 @@
-[1774547615,1774547646]
\ No newline at end of file
+[1774615474]
\ No newline at end of file
diff --git a/storage/test.db b/storage/test.db
index 916a045..cfe9a81 100644
Binary files a/storage/test.db and b/storage/test.db differ
diff --git a/templates/admin/head.php b/templates/admin/head.php
index 74e287e..16ae287 100644
--- a/templates/admin/head.php
+++ b/templates/admin/head.php
@@ -18,7 +18,8 @@
     <?php endif; ?>
 </head>
 <body class="admin-body">
-    <nav class="admin-nav">
+    <a href="#main-content" class="skip-link">Aller au contenu principal</a>
+    <nav class="admin-nav" aria-label="Navigation admin">
         <a href="/admin/" class="admin-nav__logo">Posterg</a>
         <?php
         $currentPage = basename($_SERVER['PHP_SELF']);