feat: hero effect with dynamic navbar height and inline title

app/layouts/topnav.vue

@@ -8,24 +8,10 @@
         <div class="absolute inset-0 bg-[radial-gradient(ellipse_at_center,_var(--tw-gradient-stops))] from-primary/20 via-transparent to-transparent" />
       </template>
 
-      <!-- Hero title (home page only, fades on scroll) -->
-      <div
-        v-if="isHomePage"
-        class="absolute left-0 right-0 text-center pointer-events-none z-20"
-        :style="heroTitleStyle"
-      >
-        <h1 class="text-4xl lg:text-5xl font-bold text-white mb-2">
-          {{ $t('hero.title', 'Оптовая торговля') }}
-        </h1>
-        <p class="text-lg text-white/70">
-          {{ $t('hero.subtitle', 'Найдите лучших поставщиков и товары') }}
-        </p>
-      </div>
-
-      <!-- MainNavigation - same everywhere, centered vertically on home page -->
+      <!-- MainNavigation - dynamic height on home page -->
       <MainNavigation
         class="relative z-10"
-        :style="mainNavStyle"
+        :height="isHomePage ? heroHeight : 100"
         :session-checked="sessionChecked"
         :logged-in="isLoggedIn"
         :user-avatar-svg="userAvatarSvg"
@@ -58,7 +44,19 @@
         @update:search-query="searchQuery = $event"
         @update-quantity="setQuantity"
         @search="onSearch"
-      />
+      >
+        <!-- Hero content for home page -->
+        <template v-if="isHomePage && collapseProgress < 1" #hero>
+          <div class="text-center mb-4" :style="{ opacity: 1 - collapseProgress }">
+            <h1 class="text-4xl lg:text-5xl font-bold text-white mb-2">
+              {{ $t('hero.title', 'Оптовая торговля') }}
+            </h1>
+            <p class="text-lg text-white/70">
+              {{ $t('hero.subtitle', 'Найдите лучших поставщиков и товары') }}
+            </p>
+          </div>
+        </template>
+      </MainNavigation>
 
       <!-- Sub Navigation (section-specific tabs) - only for non-catalog/non-home sections -->
       <SubNavigation
@@ -177,12 +175,8 @@ const hasSubNav = computed(() => !isHomePage.value && !isCatalogSection.value)
 const canCollapse = computed(() => hasSubNav.value)
 const isHeaderCollapsed = computed(() => canCollapse.value && isCollapsed.value)
 
-// Header container style - dynamic height for home page, transform for SubNav pages
+// Header container style - transform for SubNav pages
 const headerContainerStyle = computed(() => {
-  if (isHomePage.value) {
-    // Home page: height changes from heroHeight to 100px on scroll
-    return { height: `${heroHeight.value}px` }
-  }
   if (hasSubNav.value) {
     // SubNav pages: slide up on scroll
     return { transform: `translateY(${headerOffset.value}px)` }
@@ -190,25 +184,6 @@ const headerContainerStyle = computed(() => {
   return {}
 })
 
-// MainNavigation style - centered vertically on home page, normal on other pages
-const mainNavStyle = computed(() => {
-  if (!isHomePage.value) return {}
-  // Center MainNav (100px) in container: margin-top = (height - 100) / 2
-  const marginTop = Math.max(0, (heroHeight.value - 100) / 2)
-  return { marginTop: `${marginTop}px` }
-})
-
-// Hero title style - positioned above MainNav, fades on scroll
-const heroTitleStyle = computed(() => {
-  // Position title above the centered MainNav
-  const navMarginTop = Math.max(0, (heroHeight.value - 100) / 2)
-  const titleBottom = heroHeight.value - navMarginTop + 20 // 20px gap above nav
-  return {
-    bottom: `${titleBottom}px`,
-    opacity: 1 - collapseProgress.value,
-    transform: `translateY(${collapseProgress.value * -20}px)`
-  }
-})
 
 // Main content padding-top to compensate for fixed header
 const mainStyle = computed(() => {