diff --git a/src/layouts/BaseLayout.astro b/src/layouts/BaseLayout.astro
index 95e5aa3..c82ebe9 100644
--- a/src/layouts/BaseLayout.astro
+++ b/src/layouts/BaseLayout.astro
@@ -24,7 +24,10 @@ const pageTitle = title ? `${title} · ${site.name}` : site.name;
       <div class="container topbar-inner">
         <a class="brand brand-mobile" href="/"><img src="/images/logo-text.webp" alt="Swansea Airport" /></a>
         <details class="mobile-nav">
-          <summary></summary>
+          <summary aria-label="Main menu">
+            <span class="mobile-nav-icon" aria-hidden="true"></span>
+            <span>Menu</span>
+          </summary>
           <div class="mobile-nav-panel">
             {site.navigation.map((item) => (
               item.children ? (
diff --git a/src/styles/global.css b/src/styles/global.css
index 97248ef..a9dec57 100644
--- a/src/styles/global.css
+++ b/src/styles/global.css
@@ -190,34 +190,91 @@ img {
 
 .mobile-nav > summary {
   list-style: none;
-  display: flex;
+  display: inline-flex;
   align-items: center;
   justify-content: center;
-  min-height: 2.75rem;
-  min-width: 2.75rem;
-  padding: 0;
+  gap: 0.45rem;
+  min-height: 3rem;
+  min-width: 5.5rem;
+  padding: 0 0.85rem;
   border: 1px solid var(--line);
-  border-radius: 0.7rem;
-  background: linear-gradient(180deg, rgba(255, 255, 255, 0.95), rgba(228, 240, 252, 0.95));
-  color: var(--brand);
+  border-radius: 0.85rem;
+  background: var(--brand);
+  color: #ffffff;
   font-weight: 800;
-  font-size: 1.4rem;
+  font-size: 0.96rem;
+  line-height: 1;
   cursor: pointer;
-  box-shadow: var(--shadow);
+  box-shadow: 0 12px 28px rgba(11, 79, 122, 0.22);
+  text-decoration: none;
+}
+
+.mobile-nav > summary span:not(.mobile-nav-icon) {
+  display: block;
+  line-height: 1;
+}
+
+.mobile-nav > summary:hover,
+.mobile-nav > summary:focus-visible {
+  background: #083c5f;
+}
+
+.mobile-nav > summary:focus-visible {
+  outline: 3px solid rgba(246, 181, 56, 0.72);
+  outline-offset: 3px;
 }
 
 .mobile-nav > summary::-webkit-details-marker {
   display: none;
 }
 
-.mobile-nav > summary::before {
-  content: '☰';
-  line-height: 1;
+.mobile-nav-icon {
+  position: relative;
+  display: block;
+  width: 1.2rem;
+  height: 0.9rem;
+  flex: 0 0 auto;
+  border-block: 0.18rem solid currentColor;
 }
 
-.mobile-nav[open] > summary::before {
-  content: '✕';
-  font-size: 1.2rem;
+.mobile-nav-icon::before,
+.mobile-nav-icon::after {
+  content: '';
+  position: absolute;
+  left: 0;
+  width: 100%;
+  height: 0.18rem;
+  border-radius: 999px;
+  background: currentColor;
+}
+
+.mobile-nav-icon::before {
+  top: 50%;
+  transform: translateY(-50%);
+}
+
+.mobile-nav-icon::after {
+  display: none;
+}
+
+.mobile-nav[open] .mobile-nav-icon {
+  width: 1rem;
+  height: 1rem;
+  border-block: 0;
+}
+
+.mobile-nav[open] .mobile-nav-icon::before,
+.mobile-nav[open] .mobile-nav-icon::after {
+  display: block;
+  top: 50%;
+}
+
+.mobile-nav[open] .mobile-nav-icon::before {
+  transform: translateY(-50%) rotate(45deg);
+}
+
+.mobile-nav[open] .mobile-nav-icon::after {
+  transform: translateY(-50%) rotate(-45deg);
 }
 
 .mobile-nav-panel {
@@ -903,6 +960,16 @@ section {
     max-height: 2rem;
   }
 
+  @media (max-width: 390px) {
+    .topbar-inner {
+      gap: 0.65rem;
+    }
+
+    .brand-mobile img {
+      max-width: min(12rem, 58vw);
+    }
+  }
+
   .runway-facts-table {
     min-width: 38rem;
   }