diff --git a/landing/src/App.jsx b/landing/src/App.jsx
index d22f5bd..e1ac3ec 100644
--- a/landing/src/App.jsx
+++ b/landing/src/App.jsx
@@ -755,10 +755,10 @@ function HeroGraph({ className = '' }) {
   }, [])
 
   return (
-    <div ref={containerRef} className={`relative w-full max-w-2xl mx-auto lg:mx-0 ${className}`} data-reveal data-hero-galaxy>
+    <div ref={containerRef} className={`relative w-full max-w-2xl mx-auto lg:mx-0 hero-graph ${className}`} data-reveal data-hero-galaxy>
       <canvas
         ref={canvasRef}
-        className="block w-full h-[40svh] sm:h-[clamp(420px,92vw,560px)]"
+        className="block w-full h-[40svh] sm:h-[clamp(420px,92vw,560px)] lg:h-[clamp(560px,46vw,700px)]"
         aria-label="Arbre de famille animé"
       />
     </div>
diff --git a/landing/src/index.css b/landing/src/index.css
index 74fb20d..0b22ce7 100644
--- a/landing/src/index.css
+++ b/landing/src/index.css
@@ -87,6 +87,10 @@ em.s { font-style: italic; font-weight: 300; }
 .hero-txt { display: grid; gap: 24px; justify-items: start; }
 .hero-txt .t-d1 { max-width: 17ch; font-size: clamp(40px, 4.6vw, 64px); line-height: 1.04; }
 .hero-txt .lede { max-width: 44ch; }
+/* Le visuel du hero déborde sur la marge droite, jamais au-delà de l'écran (24px de garde pour la barre de défilement) */
+@media (min-width: 1024px) {
+  .hero-graph { max-width: none; margin-left: -40px; width: calc(100% + 40px + var(--gut) + max(0px, (100vw - 1200px) / 2) - 24px); }
+}
 .ctas { display: flex; gap: 10px; flex-wrap: wrap; }
 
 @keyframes rise { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }