Merge pull request 'fix: show 'not available on mobile' message instead of broken layout' (#3) from fix/mobile-not-available into main

Reviewed-on: #3

src/main.js

@@ -1128,25 +1128,39 @@ function handleResize(state) {
 
 // --- Bootstrap ---------------------------------------------------------------
 
-async function init() {
+// --- Mobile Detection --------------------------------------------------------
-    log.info("NetWatch starting");
 
-    // Mobile detection — show a friendly message and bail out early
+function isMobile() {
-    if (window.innerWidth < 768) {
+    // Check both user agent and viewport width for robust detection
+    const uaMatch =
+        /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(
+            navigator.userAgent,
+        );
+    const narrowViewport = window.innerWidth <= 768;
+    return uaMatch || narrowViewport;
+}
+
+function buildMobileUI() {
     const app = document.getElementById("app");
     app.innerHTML = `
     <div class="mx-auto px-[5%] py-8">
       <header class="mb-8">
         <h1 class="text-3xl font-bold text-white"><a href="https://git.eeqj.de/sneak/netwatch" target="_blank" rel="noopener" class="underline decoration-dashed decoration-gray-500 underline-offset-4">NetWatch</a> by <a href="https://sneak.berlin" target="_blank" rel="noopener" class="text-blue-400 underline hover:text-blue-300">@sneak</a></h1>
-            <p class="text-gray-400 mt-2">Real-time network connectivity monitor</p>
+        <p class="text-gray-400 text-sm mt-2">Real-time network latency monitor</p>
       </header>
-          <div style="display:flex;align-items:center;justify-content:center;min-height:50vh;">
+      <div style="margin: 2rem auto; max-width: 500px; padding: 3rem 2rem; background: rgba(31, 41, 55, 0.7); border: 1px solid rgba(75, 85, 99, 0.5); border-radius: 1rem; text-align: center;">
-            <div style="background:#1f2937;border:1px solid #374151;border-radius:12px;padding:2rem 1.5rem;text-align:center;max-width:90vw;">
+        <p style="font-size: 1.5rem; font-weight: 600; color: #d1d5db;">Not yet available on mobile.</p>
-              <p style="font-size:1.25rem;color:#e5e7eb;margin:0;">Not yet available on mobile.</p>
+        <p style="font-size: 0.875rem; color: #6b7280; margin-top: 1rem;">Please visit on a desktop browser for the full experience.</p>
-            </div>
       </div>
     </div>`;
-        log.info("Mobile viewport detected — skipping monitor startup");
+}
+
+async function init() {
+    log.info("NetWatch starting");
+
+    if (isMobile()) {
+        log.info("Mobile device detected — showing placeholder");
+        buildMobileUI();
         return;
     }