Correction du placement du logo et du subtitle dans le branding

static/css/app.css

@@ -350,7 +350,8 @@ body {
     display: flex;
     align-items: center;
     justify-content: space-between;
-    height: 64px;
+    height: auto;
+    min-height: 64px;
     padding: 0 var(--gutter);
     background: var(--nav-bg);
     -webkit-backdrop-filter: blur(10px);
@@ -438,12 +439,21 @@ body {
 }
 
 .brand {
+    display: flex;
+    flex-direction: column;
+    gap: 2px;
     font-size: clamp(1.1rem, 2vw, 1.5rem);
     font-weight: 600;
     letter-spacing: 0.2cm;
     font-variant: small-caps;
 }
 
+.brand-title {
+    display: inline-flex;
+    align-items: center;
+    gap: 10px;
+}
+
 /* Logo inside brand: keep it within navbar height */
 .brand .logo {
     max-height: 64px;
@@ -455,6 +465,7 @@ body {
 .subtitle {
     font-size: 1rem;
     letter-spacing: 0.05cm;
+    margin-top: 2px;
 }
 
 a.site-nav-link,