diff --git a/index.html b/index.html
index eba9396..88245f3 100644
--- a/index.html
+++ b/index.html
@@ -3072,7 +3072,7 @@
     ${esc(id.nom)}<span class="hero-name-line2">${esc(id.prenom)}</span>
   </h1>
   <p class="hero-subtitle">${esc(id.accroche)}</p>
-  <div style="margin-top:20px;display:inline-block"><a href="infrastructure.html" class="infra-btn">⚡ Voir mon infrastructure</a></div>
+  <div style="margin-top:20px;display:inline-block"><a id="infraBtn" href="infrastructure.html" class="infra-btn">⚡ Voir mon infrastructure</a></div>
   <div class="hero-stats">
     ${d.stats.map(s => `
     <div class="stat-box">
@@ -3239,6 +3239,9 @@
     const cvAllowed = ['ux', 'dsi'];
     const cvFile = cvAllowed.includes(cvParam) ? `cv-data-${cvParam}.json` : 'cv-data.json';
 
+    const infraBtn = document.getElementById('infraBtn');
+    if (infraBtn && cvParam) infraBtn.href = `infrastructure.html?cv=${cvParam}`;
+
     fetch(cvFile)
       .then(r => {
         if (!r.ok) throw new Error('Impossible de charger ' + cvFile + ' (code ' + r.status + ')');
diff --git a/infrastructure.html b/infrastructure.html
index 5295f73..264d4ce 100644
--- a/infrastructure.html
+++ b/infrastructure.html
@@ -716,7 +716,7 @@
 <body>
   <main class="page">
     <section class="tagline" style="margin: 0 auto 18px;">
-      <div style="text-align:left;margin-bottom:10px"><a href="index.html" style="color:var(--muted);font-size:12px;text-decoration:none;letter-spacing:.08em;text-transform:uppercase;">← Retour au CV</a></div>
+      <div style="text-align:left;margin-bottom:10px"><a id="backBtn" href="index.html" style="color:var(--muted);font-size:12px;text-decoration:none;letter-spacing:.08em;text-transform:uppercase;">← Retour au CV</a></div>
       <h1><span class="blue-text">MON CODE.</span> <span class="green-text">MON INFRASTRUCTURE.</span> <span
           class="orange-text">MA MAÎTRISE.</span></h1>
       <p>Liberté, performance et sécurité au service de mon identité professionnelle.</p>
@@ -978,6 +978,10 @@
 
 
   </main>
+<script>
+  const cv = new URLSearchParams(window.location.search).get('cv');
+  if (cv) document.getElementById('backBtn').href = `index.html?cv=${cv}`;
+</script>
 </body>
 
 </html>
\ No newline at end of file
