diff --git a/src/lib/components/Header.svelte b/src/lib/components/Header.svelte
index c2755a6..f8f973c 100644
--- a/src/lib/components/Header.svelte
+++ b/src/lib/components/Header.svelte
@@ -64,6 +64,11 @@
         } else {
             searchOpen = false;
             menuOpen = true;
+            // Sektion der aktuellen Seite direkt aufgeklappt zeigen.
+            openSubmenu =
+                links.find(
+                    (l) => l.children && l.children.length > 0 && isActiveTree(l, $page.url.pathname),
+                )?.label ?? null;
         }
     }
 
@@ -111,7 +116,7 @@
 
 <header
     id="horizontal-navigation"
-    class="relative sticky top-0 z-20 border-b border-white/30 shadow-2xl backdrop-blur-md bg-wald-50"
+    class="relative sticky top-0 z-20 border-b border-white/30 shadow-2xl bg-wald-50"
 >
     <span class="gradient-blob-bg-inner" aria-hidden="true"></span>
     <div class="relative flex items-center justify-between container-custom py-2">
@@ -122,11 +127,11 @@
         >
             {#if logoSvgHtml}
                 <span
-                    class="logo-svg h-10 w-auto inline-flex items-center text-inherit [&_svg]:block [&_svg]:h-full [&_svg]:w-auto [&_svg]:max-h-10"
+                    class="logo-svg h-8 lg:h-10 w-auto inline-flex items-center text-inherit [&_svg]:block [&_svg]:h-full [&_svg]:w-auto [&_svg]:max-h-8 lg:[&_svg]:max-h-10"
                     aria-hidden="true">{@html logoSvgHtml}</span
                 >
             {:else if logoUrl && logoUrl.trim() !== ""}
-                <img src={logoUrl} alt="" class="h-10 w-auto object-contain" />
+                <img src={logoUrl} alt="" class="h-8 lg:h-10 w-auto object-contain" />
             {:else}
                 <span>{t(T.site_name_fallback)}</span>
             {/if}
@@ -242,7 +247,7 @@
         <div class="lg:hidden flex items-center gap-1">
             <button
                 type="button"
-                class="p-2 rounded-xs transition-colors flex items-center justify-center"
+                class="rounded-full border border-wald-700/15 bg-wald-700/8 px-2.5 py-1 transition-opacity hover:opacity-70 inline-flex items-center justify-center"
                 aria-label={searchOpen
                     ? t(T.header_search_close)
                     : t(T.header_search_open)}
@@ -253,20 +258,20 @@
                 {#if searchOpen}
                     <Icon
                         icon="lucide:x"
-                        class="text-2xl text-error!"
+                        class="text-sm text-error!"
                         aria-hidden="true"
                     />
                 {:else}
                     <Icon
                         icon="lucide:search"
-                        class="text-2xl"
+                        class="text-sm"
                         aria-hidden="true"
                     />
                 {/if}
             </button>
             <button
                 type="button"
-                class="p-2 -mr-2 hover:bg-stein-0/10 rounded-xs transition-colors flex items-center justify-center"
+                class="-mr-1 inline-flex items-center gap-1.5 rounded-full border border-wald-700/15 bg-wald-700/8 px-2.5 py-1 transition-opacity hover:opacity-70"
                 aria-label={menuOpen
                     ? t(T.header_menu_close)
                     : t(T.header_menu_open)}
@@ -280,14 +285,11 @@
                         : t(T.header_menu_open)}</span
                 >
                 {#if menuOpen}
-                    <Icon
-                        icon="lucide:x"
-                        class="text-2xl"
-                        aria-hidden="true"
-                    />
+                    <Icon icon="lucide:x" class="text-sm" aria-hidden="true" />
                 {:else}
-                    <Icon icon="lucide:menu" class="text-2xl" aria-hidden="true" />
+                    <Icon icon="lucide:menu" class="text-sm" aria-hidden="true" />
                 {/if}
+                <span class="text-[.7rem] leading-none" aria-hidden="true">{menuOpen ? "Schließen" : "Menü"}</span>
             </button>
         </div>
     </div>
@@ -298,7 +300,7 @@
     {#if menuOpen}
         <div
             id="mobile-nav"
-            class="lg:hidden border-t border-stein-0/10 bg-stein-900/98 backdrop-blur max-h-[calc(100dvh-3.5rem)] overflow-y-auto overscroll-contain"
+            class="lg:hidden absolute left-0 right-0 top-full z-30 shadow-2xl border-t border-stein-0/10 bg-stein-900/90 backdrop-blur-lg max-h-[calc(100dvh-3.5rem)] overflow-y-auto overscroll-contain"
             role="dialog"
             aria-label="Navigation"
             in:slide={{ duration: 200 }}
@@ -308,6 +310,10 @@
                 class="container-custom pt-4 pb-[calc(2rem+env(safe-area-inset-bottom))] flex flex-col gap-1"
                 aria-label={t(T.header_nav_aria)}
             >
+                <div class="grid grid-cols-2 gap-2 pb-3 mb-1 border-b border-stein-0/10">
+                    <a href="/mitmachen/" class="btn-primary btn-sm justify-center" onclick={closeMenu}>Mitmachen</a>
+                    <a href="/termin-melden" class="btn-warning btn-sm justify-center" onclick={closeMenu}>Termin melden</a>
+                </div>
                 {#each links as link}
                     {@const active = isActiveTree(link, $page.url.pathname)}
                     {#if link.children && link.children.length > 0}
@@ -328,7 +334,7 @@
                                         {@const pActive = isActiveLink(link.href, $page.url.pathname)}
                                         <a
                                             href={link.href}
-                                            class="block py-2 px-3 text-sm {pActive ? 'font-bold text-wald-300' : 'text-stein-200 hover:text-stein-0'}"
+                                            class="block py-3 px-3 text-sm {pActive ? 'font-bold text-wald-300' : 'text-stein-200 hover:text-stein-0'}"
                                             aria-current={pActive ? "page" : undefined}
                                             onclick={closeMenu}
                                         >
@@ -339,7 +345,7 @@
                                         {@const cActive = isActiveLink(child.href, $page.url.pathname)}
                                         <a
                                             href={child.href}
-                                            class="block py-2 px-3 text-sm {cActive ? 'font-bold text-wald-300' : 'text-stein-200 hover:text-stein-0'}"
+                                            class="block py-3 px-3 text-sm {cActive ? 'font-bold text-wald-300' : 'text-stein-200 hover:text-stein-0'}"
                                             aria-current={cActive ? "page" : undefined}
                                             onclick={closeMenu}
                                         >
diff --git a/src/lib/iconify-lucide-subset.generated.json b/src/lib/iconify-lucide-subset.generated.json
index c767c3f..00df499 100644
--- a/src/lib/iconify-lucide-subset.generated.json
+++ b/src/lib/iconify-lucide-subset.generated.json
@@ -129,6 +129,9 @@
     "calendar-search": {
       "body": "<g fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\"><path d=\"M16 2v4m5 5.75V6a2 2 0 0 0-2-2H5a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h7.25M22 22l-1.875-1.875M3 10h18M8 2v4\"/><circle cx=\"18\" cy=\"18\" r=\"3\"/></g>"
     },
+    "plus": {
+      "body": "<path fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M5 12h14m-7-7v14\"/>"
+    },
     "calendar-plus": {
       "body": "<path fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M16 19h6M16 2v4m3 10v6m2-9.402V6a2 2 0 0 0-2-2H5a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h8.5M3 10h18M8 2v4\"/>"
     },