Fix light mode nav invisible, logo § calligraphié, typo ronde fine

- Navigation : btn-ghost, active-class, footer, nav mobile → CSS vars adaptatifs
- Overrides light mode renforcés avec !important (scoped styles compatibles)
- btn-primary garde text-white en light mode (fond coloré)
- Logo : symbole § calligraphié SVG inline remplace lucide-book-open
- Logo text : font-display weight 300 (ronde fine) + text-gradient
- Logo SVG aussi exporté en /public/images/logo-section.svg
- Header/footer : backgrounds et bordures via CSS vars

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/components/layout/NavMobile.vue

@@ -11,7 +11,7 @@
     <Transition name="slide-menu">
       <nav
         v-if="open"
-        class="fixed inset-y-0 right-0 z-50 w-72 bg-surface-600 border-l border-white/8 p-6 shadow-2xl"
+        class="fixed inset-y-0 right-0 z-50 w-72 bg-[hsl(var(--color-surface))] border-l border-[hsl(var(--color-text)/0.1)] p-6 shadow-2xl"
         aria-label="Menu mobile"
       >
         <div class="flex items-center justify-between mb-8">
@@ -29,7 +29,7 @@
           <li v-for="item in nav" :key="item.to">
             <NuxtLink
               :to="item.to"
-              class="flex items-center gap-3 rounded-lg px-4 py-3 text-base font-medium transition-colors hover:bg-white/5"
+              class="flex items-center gap-3 rounded-lg px-4 py-3 text-base font-medium text-[hsl(var(--color-text)/0.7)] transition-colors hover:bg-[hsl(var(--color-text)/0.06)] hover:text-[hsl(var(--color-text))]"
               active-class="bg-primary/10 text-primary"
               @click="emit('update:open', false)"
             >

app/components/layout/TheFooter.vue

@@ -1,5 +1,5 @@
 <template>
-  <footer class="footer-wrap border-t border-white/8 bg-surface-600">
+  <footer class="footer-wrap border-t border-[hsl(var(--color-text)/0.1)] bg-[hsl(var(--color-surface))]">
     <!-- Shadok pattern -->
     <svg class="footer-shadok-pattern" viewBox="0 0 400 80" fill="none" aria-hidden="true">
       <g transform="translate(20,10)">
@@ -42,7 +42,7 @@
     <div class="container-content px-4 py-8 relative z-1">
       <div class="flex flex-col items-center gap-4 md:flex-row md:justify-between">
         <!-- Credits -->
-        <p class="text-sm text-white/40">
+        <p class="text-sm text-[hsl(var(--color-text)/0.4)]">
           {{ site?.footer.credits }}
         </p>
 
@@ -52,7 +52,7 @@
             v-for="link in site?.footer.links"
             :key="link.to"
             :to="link.to"
-            class="text-sm text-white/40 transition-colors hover:text-white/70"
+            class="text-sm text-[hsl(var(--color-text)/0.4)] transition-colors hover:text-[hsl(var(--color-text)/0.7)]"
           >
             {{ link.label }}
           </NuxtLink>

app/components/layout/TheHeader.vue

@@ -1,10 +1,17 @@
 <template>
-  <header class="sticky top-0 z-40 border-b border-white/8 bg-surface-bg/80 backdrop-blur-xl">
+  <header class="sticky top-0 z-40 border-b border-[hsl(var(--color-text)/0.08)] bg-[hsl(var(--color-bg)/0.85)] backdrop-blur-xl">
     <div class="container-content flex h-[var(--header-height)] items-center justify-between px-4">
       <!-- Logo -->
-      <NuxtLink to="/" class="flex items-center gap-2 text-lg tracking-tight">
-        <div class="i-lucide-book-open h-6 w-6 text-primary" />
-        <span class="font-calligraphy font-bold text-gradient text-xl italic">{{ site?.identity.name }}</span>
+      <NuxtLink to="/" class="logo-link flex items-center gap-2.5">
+        <svg class="logo-section" viewBox="0 0 64 80" fill="none" aria-hidden="true">
+          <path d="M38 8 C28 6 18 10 18 20 C18 28 26 32 34 34 C42 36 48 40 48 48 C48 52 46 55 42 57 L44 40 C44 36 40 32 34 30 C28 28 22 24 22 18 C22 14 24 11 28 10Z" fill="currentColor" opacity="0.9"/>
+          <path d="M26 72 C36 74 46 70 46 60 C46 52 38 48 30 46 C22 44 16 40 16 32 C16 28 18 25 22 23 L20 40 C20 44 24 48 30 50 C36 52 42 56 42 62 C42 66 40 69 36 70Z" fill="currentColor" opacity="0.9"/>
+          <path d="M20 16 C20 8 28 4 36 6 C42 8 46 14 44 20" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" fill="none" opacity="0.7"/>
+          <path d="M44 64 C44 72 36 76 28 74 C22 72 18 66 20 60" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" fill="none" opacity="0.7"/>
+          <path d="M36 4 Q42 2 46 6" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" fill="none" opacity="0.5"/>
+          <path d="M28 76 Q22 78 18 74" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" fill="none" opacity="0.5"/>
+        </svg>
+        <span class="logo-text">{{ site?.identity.name }}</span>
       </NuxtLink>
 
       <!-- Desktop navigation -->
@@ -14,7 +21,7 @@
           :key="item.to"
           :to="item.to"
           class="btn-ghost text-sm"
-          active-class="text-white! bg-white/5"
+          active-class="!text-[hsl(var(--color-text))] bg-[hsl(var(--color-text)/0.06)]"
         >
           {{ item.label }}
         </NuxtLink>
@@ -40,3 +47,30 @@
 const { data: site } = await useSiteContent()
 const isMobileMenuOpen = ref(false)
 </script>
+
+<style scoped>
+.logo-link {
+  transition: opacity 0.2s;
+}
+.logo-link:hover {
+  opacity: 0.8;
+}
+
+.logo-section {
+  width: 1.6rem;
+  height: 2rem;
+  color: hsl(var(--color-primary));
+  flex-shrink: 0;
+}
+
+.logo-text {
+  font-family: var(--font-display);
+  font-weight: 300;
+  font-size: 1.25rem;
+  letter-spacing: 0.04em;
+  background-image: linear-gradient(to right, hsl(var(--color-primary)), hsl(var(--color-accent)));
+  -webkit-background-clip: text;
+  background-clip: text;
+  -webkit-text-fill-color: transparent;
+}
+</style>