diff --git a/public/index.php b/public/index.php
index 90af0d6..ec3d9a8 100644
--- a/public/index.php
+++ b/public/index.php
@@ -26,19 +26,22 @@ switch ($action) {
     case 'create':
         requireAuth();
 
-        $title        = $_POST['title']        ?? '';
-        $content      = $_POST['content']      ?? '';
-        $postSlug     = $_POST['slug']          ?? '';
-        $published    = isset($_POST['published']);
-        $published_at = str_replace('T', ' ', $_POST['published_at'] ?? date('Y-m-d H:i:s'));
-        $errors       = [];
+        $title          = $_POST['title']           ?? '';
+        $content        = $_POST['content']         ?? '';
+        $postSlug       = $_POST['slug']             ?? '';
+        $published      = isset($_POST['published']);
+        $published_at   = str_replace('T', ' ', $_POST['published_at'] ?? date('Y-m-d H:i:s'));
+        $seoTitle       = $_POST['seo_title']        ?? '';
+        $seoDescription = $_POST['seo_description']  ?? '';
+        $ogImage        = $_POST['og_image']         ?? '';
+        $errors         = [];
 
         if ($_SERVER['REQUEST_METHOD'] === 'POST') {
             if (trim($title) === '') {
                 $errors[] = 'Le titre est obligatoire.';
             }
             if (empty($errors)) {
-                $newUuid = $articles->create($title, $content, $published, $postSlug, $published_at, currentUserEmail() ?? '');
+                $newUuid = $articles->create($title, $content, $published, $postSlug, $published_at, currentUserEmail() ?? '', $seoTitle, $seoDescription, $ogImage);
 
                 foreach ($_FILES['files']['tmp_name'] ?? [] as $i => $tmpName) {
                     if ($_FILES['files']['error'][$i] === UPLOAD_ERR_OK) {
@@ -105,13 +108,16 @@ switch ($action) {
             exit;
         }
 
-        $title        = $_POST['title']        ?? $article['title'];
-        $content      = $_POST['content']      ?? $article['content'];
-        $postSlug     = $_POST['slug']          ?? $article['slug'];
-        $published    = isset($_POST['published']) ? true : $article['published'];
-        $published_at = $_POST['published_at']
+        $title          = $_POST['title']           ?? $article['title'];
+        $content        = $_POST['content']         ?? $article['content'];
+        $postSlug       = $_POST['slug']             ?? $article['slug'];
+        $published      = isset($_POST['published']) ? true : $article['published'];
+        $published_at   = $_POST['published_at']
             ?? date('Y-m-d\TH:i', strtotime((string)($article['published_at'] ?? 'now')));
-        $errors = [];
+        $seoTitle       = $_POST['seo_title']        ?? ($article['seo_title'] ?? '');
+        $seoDescription = $_POST['seo_description']  ?? ($article['seo_description'] ?? '');
+        $ogImage        = $_POST['og_image']         ?? ($article['og_image'] ?? '');
+        $errors         = [];
 
         if ($_SERVER['REQUEST_METHOD'] === 'POST') {
             if (trim($title) === '') {
@@ -125,7 +131,10 @@ switch ($action) {
                     $published,
                     $_POST['slug'] ?? '',
                     str_replace('T', ' ', $_POST['published_at'] ?? ''),
-                    $_POST['revision_comment'] ?? ''
+                    $_POST['revision_comment'] ?? '',
+                    $_POST['seo_title'] ?? '',
+                    $_POST['seo_description'] ?? '',
+                    $_POST['og_image'] ?? ''
                 );
 
                 foreach ($_FILES['files']['tmp_name'] ?? [] as $i => $tmpName) {
@@ -150,6 +159,15 @@ switch ($action) {
         include BASE_PATH . '/templates/post_form.php';
         break;
 
+    case 'delete_file':
+        requireAuth();
+        $fileName = basename($_POST['name'] ?? '');
+        if ($uuid !== '' && $fileName !== '' && $fileName[0] !== '.') {
+            $articles->deleteFile($uuid, $fileName);
+        }
+        header('Location: /?action=edit&uuid=' . rawurlencode($uuid));
+        exit;
+
     case 'delete':
         requireAuth();
         if ($uuid !== '') {
diff --git a/src/ArticleManager.php b/src/ArticleManager.php
index 6b72298..a85f58b 100644
--- a/src/ArticleManager.php
+++ b/src/ArticleManager.php
@@ -69,7 +69,7 @@ class ArticleManager
     //  Écriture
     // ------------------------------------------------------------------ //
 
-    public function create(string $title, string $content, bool $published, string $slug = '', string $publishedAt = '', string $author = ''): string
+    public function create(string $title, string $content, bool $published, string $slug = '', string $publishedAt = '', string $author = '', string $seoTitle = '', string $seoDescription = '', string $ogImage = ''): string
     {
         $uuid        = $this->generateUuid();
         $slug        = $slug !== '' ? $this->sanitizeSlug($slug) : $this->generateSlug($title);
@@ -82,15 +82,18 @@ class ArticleManager
         mkdir($dir . '/files', 0755, true);
 
         $meta = [
-            'uuid'         => $uuid,
-            'slug'         => $slug,
-            'title'        => $title,
-            'author'       => $author,
-            'published'    => $published,
-            'published_at' => $publishedAt,
-            'created_at'   => $now,
-            'updated_at'   => $now,
-            'revisions'    => [],
+            'uuid'            => $uuid,
+            'slug'            => $slug,
+            'title'           => $title,
+            'author'          => $author,
+            'published'       => $published,
+            'published_at'    => $publishedAt,
+            'created_at'      => $now,
+            'updated_at'      => $now,
+            'revisions'       => [],
+            'seo_title'       => $seoTitle,
+            'seo_description' => $seoDescription,
+            'og_image'        => $ogImage,
         ];
         $this->writeMeta($dir, $meta);
         file_put_contents($dir . '/index.md', ltrim($content));
@@ -98,7 +101,7 @@ class ArticleManager
         return $uuid;
     }
 
-    public function update(string $uuid, string $title, string $content, bool $published, string $slug, string $publishedAt, string $revisionComment = ''): void
+    public function update(string $uuid, string $title, string $content, bool $published, string $slug, string $publishedAt, string $revisionComment = '', string $seoTitle = '', string $seoDescription = '', string $ogImage = ''): void
     {
         $article = $this->getByUuid($uuid);
         if (!$article) {
@@ -113,15 +116,18 @@ class ArticleManager
         }
 
         $meta = [
-            'uuid'         => $uuid,
-            'slug'         => $slug,
-            'title'        => $title,
-            'author'       => $article['author'] ?? '',
-            'published'    => $published,
-            'published_at' => $publishedAt !== '' ? $publishedAt : ($article['published_at'] ?? date('Y-m-d H:i:s')),
-            'created_at'   => $article['created_at'] ?? date('Y-m-d H:i:s'),
-            'updated_at'   => date('Y-m-d H:i:s'),
-            'revisions'    => $revisions,
+            'uuid'            => $uuid,
+            'slug'            => $slug,
+            'title'           => $title,
+            'author'          => $article['author'] ?? '',
+            'published'       => $published,
+            'published_at'    => $publishedAt !== '' ? $publishedAt : ($article['published_at'] ?? date('Y-m-d H:i:s')),
+            'created_at'      => $article['created_at'] ?? date('Y-m-d H:i:s'),
+            'updated_at'      => date('Y-m-d H:i:s'),
+            'revisions'       => $revisions,
+            'seo_title'       => $seoTitle,
+            'seo_description' => $seoDescription,
+            'og_image'        => $ogImage,
         ];
         $dir = $this->dataDir . '/' . $uuid;
         $this->writeMeta($dir, $meta);
@@ -173,6 +179,22 @@ class ArticleManager
         return $files;
     }
 
+    public function deleteFile(string $uuid, string $name): bool
+    {
+        if (!$this->isValidUuid($uuid)) {
+            return false;
+        }
+        $name = basename($name);
+        if ($name === '' || $name[0] === '.') {
+            return false;
+        }
+        $path = $this->dataDir . '/' . $uuid . '/files/' . $name;
+        if (!is_file($path)) {
+            return false;
+        }
+        return unlink($path);
+    }
+
     public function addFile(string $uuid, array $uploadedFile): ?string
     {
         if (!$this->isValidUuid($uuid)) {
diff --git a/templates/layout.php b/templates/layout.php
index 03ef155..109b77b 100644
--- a/templates/layout.php
+++ b/templates/layout.php
@@ -2,25 +2,28 @@
 <html lang="fr">
 <head>
     <meta charset="UTF-8">
-    <title><?= htmlspecialchars($title ?? 'varlog') ?></title>
+    <title><?= htmlspecialchars(($seoTitle ?? '') ?: ($title ?? 'varlog')) ?></title>
     <meta name="viewport" content="width=device-width, initial-scale=1">
 
     <!-- SEO -->
-    <meta name="description" content="Varlog est un journal personnel en ligne de Cédrix développé par ces soins. Informatique, hack et loisirs techniques.">
+    <meta name="description" content="<?= htmlspecialchars(($seoDescription ?? '') ?: 'Varlog est un journal personnel en ligne de Cédrix. Informatique, hack et loisirs techniques.') ?>">
     <meta name="robots" content="index, follow">
 
     <!-- Open Graph -->
-    <meta property="og:title" content="<?= htmlspecialchars($title ?? 'varlog') ?>">
-    <meta property="og:description" content="Découvrez les derniers articles publiés sur le journal personnel varlog.">
-    <meta property="og:type" content="website">
+    <meta property="og:title" content="<?= htmlspecialchars(($seoTitle ?? '') ?: ($title ?? 'varlog')) ?>">
+    <meta property="og:description" content="<?= htmlspecialchars(($seoDescription ?? '') ?: 'Découvrez les derniers articles publiés sur le journal personnel varlog.') ?>">
+    <meta property="og:type" content="<?= htmlspecialchars($ogType ?? 'website') ?>">
     <meta property="og:locale" content="fr_FR">
-    <meta property="og:url" content="https://varlog.a5l.fr/">
+    <meta property="og:url" content="<?= htmlspecialchars($ogUrl ?? APP_URL) ?>">
     <meta property="og:site_name" content="varlog">
     <?php if (!empty($ogImage ?? '')): ?>
     <meta property="og:image" content="<?= htmlspecialchars($ogImage) ?>">
     <meta property="og:image:width" content="1200">
     <meta property="og:image:height" content="630">
     <?php endif; ?>
+    <?php if (!empty($articlePublishedAt ?? '')): ?>
+    <meta property="article:published_time" content="<?= htmlspecialchars(date('c', strtotime((string)$articlePublishedAt))) ?>">
+    <?php endif; ?>
 
     <!-- RSS autodiscovery -->
     <link rel="alternate" type="application/rss+xml" title="varlog" href="/feed">
diff --git a/templates/post_form.php b/templates/post_form.php
index 021f61a..10190aa 100644
--- a/templates/post_form.php
+++ b/templates/post_form.php
@@ -73,14 +73,50 @@ $dateValue = isset($published_at)
     <?php if ($action === 'edit' && !empty($existingFiles)): ?>
         <div class="mb-3">
             <p class="form-label">Fichiers existants</p>
-            <ul class="list-unstyled">
-                <?php foreach ($existingFiles as $f): ?>
-                    <li>
-                        <code><?= htmlspecialchars($f['name']) ?></code>
-                        <small class="text-muted ms-2"><?= htmlspecialchars(number_format($f['size'] / 1024, 1)) ?> Ko</small>
-                    </li>
+            <div class="list-group">
+                <?php foreach ($existingFiles as $i => $f): ?>
+                    <?php $fileUrl = '/file?uuid=' . rawurlencode($uuid) . '&name=' . rawurlencode($f['name']); ?>
+                    <div class="list-group-item d-flex align-items-center gap-3 py-2">
+                        <?php if ($f['is_image']): ?>
+                            <a href="<?= htmlspecialchars($fileUrl) ?>" target="_blank" rel="noopener">
+                                <img src="<?= htmlspecialchars($fileUrl) ?>" alt=""
+                                     style="width:48px;height:48px;object-fit:cover;border-radius:4px;flex-shrink:0">
+                            </a>
+                        <?php else: ?>
+                            <a href="<?= htmlspecialchars($fileUrl) ?>" target="_blank" rel="noopener"
+                               style="width:48px;text-align:center;font-size:1.5rem;flex-shrink:0;text-decoration:none">
+                                <?php
+                                $icon = match(true) {
+                                    str_starts_with($f['mime'], 'video/') => '🎬',
+                                    str_starts_with($f['mime'], 'audio/') => '🎵',
+                                    $f['mime'] === 'application/pdf'      => '📑',
+                                    default                               => '📄',
+                                };
+                            echo $icon;
+                            ?>
+                            </a>
+                        <?php endif; ?>
+                        <div class="flex-grow-1 overflow-hidden">
+                            <code class="d-block text-truncate"><?= htmlspecialchars($f['name']) ?></code>
+                            <small class="text-muted">
+                                <?= htmlspecialchars(number_format($f['size'] / 1024, 1)) ?> Ko
+                                &mdash; <?= htmlspecialchars($f['mime']) ?>
+                            </small>
+                        </div>
+                        <div class="d-flex gap-2 flex-shrink-0">
+                            <button type="button" class="btn btn-sm btn-outline-secondary"
+                                    onclick="copyMdRef(<?= htmlspecialchars(json_encode($f['name'])) ?>, <?= $f['is_image'] ? 'true' : 'false' ?>, this)">
+                                Référence MD
+                            </button>
+                            <button type="submit" form="del-file-<?= $i ?>"
+                                    class="btn btn-sm btn-outline-danger"
+                                    onclick="return confirm('Supprimer « <?= htmlspecialchars(addslashes($f['name'])) ?> » définitivement ?')">
+                                Supprimer
+                            </button>
+                        </div>
+                    </div>
                 <?php endforeach; ?>
-            </ul>
+            </div>
         </div>
     <?php endif; ?>
 
@@ -92,10 +128,70 @@ $dateValue = isset($published_at)
     </div>
     <?php endif; ?>
 
+    <div class="card mb-3 border-secondary">
+        <div class="card-header bg-transparent py-2">
+            <button class="btn btn-sm btn-link text-secondary text-decoration-none p-0 fw-semibold"
+                    type="button" data-bs-toggle="collapse" data-bs-target="#seoPanel" aria-expanded="false">
+                ▸ SEO — titre, description, image
+            </button>
+        </div>
+        <div class="collapse" id="seoPanel">
+            <div class="card-body">
+                <div class="mb-3">
+                    <label for="seo_title" class="form-label">
+                        Titre SEO
+                        <small class="text-muted">(balise &lt;title&gt; et og:title)</small>
+                    </label>
+                    <input type="text" class="form-control" id="seo_title" name="seo_title"
+                           maxlength="70"
+                           value="<?= htmlspecialchars($seoTitle ?? '') ?>"
+                           placeholder="Généré automatiquement depuis le titre">
+                    <div class="d-flex justify-content-between mt-1">
+                        <small class="text-muted">Idéal : 30–60 caractères</small>
+                        <small id="seo_title_counter" class="text-muted">0 / 60</small>
+                    </div>
+                </div>
+
+                <div class="mb-3">
+                    <label for="seo_description" class="form-label">
+                        Description SEO
+                        <small class="text-muted">(meta description et og:description)</small>
+                    </label>
+                    <textarea class="form-control" id="seo_description" name="seo_description"
+                              rows="3" maxlength="200"
+                              placeholder="Générée automatiquement depuis le début du contenu"><?= htmlspecialchars($seoDescription ?? '') ?></textarea>
+                    <div class="d-flex justify-content-between mt-1">
+                        <small class="text-muted">Idéal : 120–155 caractères</small>
+                        <small id="seo_desc_counter" class="text-muted">0 / 155</small>
+                    </div>
+                </div>
+
+                <div class="mb-2">
+                    <label for="og_image" class="form-label">
+                        Image Open Graph
+                        <small class="text-muted">(URL absolue, optionnel)</small>
+                    </label>
+                    <input type="url" class="form-control font-monospace" id="og_image" name="og_image"
+                           value="<?= htmlspecialchars($ogImage ?? '') ?>"
+                           placeholder="https://varlog.a5l.fr/…">
+                </div>
+            </div>
+        </div>
+    </div>
+
     <button type="submit" class="btn btn-success">Enregistrer</button>
     <a href="/" class="btn btn-secondary">Annuler</a>
 </form>
 
+<?php if ($action === 'edit' && !empty($existingFiles)): ?>
+    <?php foreach ($existingFiles as $i => $f): ?>
+    <form id="del-file-<?= $i ?>" method="POST"
+          action="/?action=delete_file&uuid=<?= rawurlencode($uuid) ?>">
+        <input type="hidden" name="name" value="<?= htmlspecialchars($f['name']) ?>">
+    </form>
+    <?php endforeach; ?>
+<?php endif; ?>
+
 <script>
 function slugify(s) {
     const map = {'à':'a','â':'a','ä':'a','é':'e','è':'e','ê':'e','ë':'e','î':'i','ï':'i','ô':'o','ö':'o','ù':'u','û':'u','ü':'u','ç':'c','æ':'ae','œ':'oe'};
@@ -121,6 +217,15 @@ document.getElementById('slug').addEventListener('input', function() {
     const s = document.getElementById('slug');
     if (s.value !== '') s._auto = false;
 })();
+
+function copyMdRef(name, isImage, btn) {
+    const ref = isImage ? `![](${name})` : `[${name}](${name})`;
+    navigator.clipboard.writeText(ref).then(() => {
+        const orig = btn.textContent;
+        btn.textContent = 'Copié !';
+        setTimeout(() => { btn.textContent = orig; }, 1500);
+    });
+}
 </script>
 
 <?php
diff --git a/templates/post_view.php b/templates/post_view.php
index 238515b..ffac604 100644
--- a/templates/post_view.php
+++ b/templates/post_view.php
@@ -87,6 +87,12 @@ $ogImage   = $coverFile !== ''
 <?php endif; ?>
 
 <?php
-$content = ob_get_clean();
-$title   = htmlspecialchars($article['title']);
+$content            = ob_get_clean();
+$title              = htmlspecialchars($article['title']);
+$seoTitle           = ($article['seo_title'] ?? '') ?: $article['title'];
+$seoDescription     = $article['seo_description'] ?? '';
+$ogImage            = $article['og_image'] ?? '';
+$ogType             = 'article';
+$ogUrl              = url('post/' . rawurlencode($article['slug'] ?? ''));
+$articlePublishedAt = $article['published_at'] ?? '';
 include __DIR__ . '/layout.php';