offline warning

src/lib/components/Offline.svelte

@@ -0,0 +1,72 @@
+<div class="offline-container">
+  <div class="flicker">
+    <svg
+      xmlns="http://www.w3.org/2000/svg"
+      width="48"
+      height="48"
+      viewBox="0 0 24 24"
+    >
+      <path
+        fill="currentColor"
+        d="M2.28 3L1 4.27l1.47 1.47c-.43.26-.86.55-1.27.86L3 9c.53-.4 1.08-.75 1.66-1.07l2.23 2.23c-.74.34-1.45.75-2.09 1.24l1.8 2.4c.78-.58 1.66-1.03 2.6-1.33L11.75 15c-1.25.07-2.41.5-3.35 1.2L12 21l2.46-3.27L17.74 21L19 19.72M12 3c-2.15 0-4.2.38-6.1 1.07l2.39 2.4C9.5 6.16 10.72 6 12 6c3.38 0 6.5 1.11 9 3l1.8-2.4C19.79 4.34 16.06 3 12 3m0 6c-.38 0-.75 0-1.12.05l3.19 3.2c1.22.28 2.36.82 3.33 1.55l1.8-2.4C17.2 9.89 14.7 9 12 9"
+      ></path>
+    </svg>
+    <h1>YOU ARE OFFLINE</h1>
+  </div>
+  <p>Please check your internet connection.</p>
+  <p class="explanation">
+    An internet connection is required to sync your wallet and make
+    transactions.
+  </p>
+</div>
+
+<style>
+  .offline-container {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    height: 100vh;
+    text-align: center;
+    color: var(--text-color);
+    font-family: "Press Start 2P", "VT323", monospace, sans-serif;
+    text-shadow: 1px 1px 0 #000;
+  }
+
+  h1 {
+    font-size: 2rem;
+    font-weight: bold;
+    text-transform: uppercase;
+    margin-top: 1rem;
+    color: var(--primary-color);
+  }
+
+  p {
+    font-size: 1rem;
+    margin-top: 1rem;
+    color: var(--accent-color);
+  }
+
+  .explanation {
+    margin-top: 2rem;
+    max-width: 40ch;
+    line-height: 1.5;
+    color: var(--text-color);
+    font-size: 0.8rem;
+    opacity: 0.8;
+  }
+
+  .flicker {
+    animation: flicker 1.5s infinite;
+  }
+
+  @keyframes flicker {
+    0%,
+    100% {
+      opacity: 1;
+    }
+    50% {
+      opacity: 0.7;
+    }
+  }
+</style>

src/lib/online.svelte.ts

@@ -0,0 +1,24 @@
+import { writable } from "svelte/store";
+
+function createOnline() {
+  const { subscribe, set } = writable(navigator.onLine);
+
+  function handleOnline() {
+    set(true);
+  }
+
+  function handleOffline() {
+    set(false);
+  }
+
+  if (typeof window !== "undefined") {
+    window.addEventListener("online", handleOnline);
+    window.addEventListener("offline", handleOffline);
+  }
+
+  return {
+    subscribe,
+  };
+}
+
+export const online = createOnline();

src/routes/+layout.svelte

@@ -94,7 +94,9 @@
 </svelte:head>
 
 <div class="retro-shader">
-  {#if showInstallPrompt && deferredPrompt}
+  {#if !$online}
+    <Offline />
+  {:else if showInstallPrompt && deferredPrompt}
     <InstallPrompt onInstall={handleInstallClick} />
   {:else if showSplash}
     <SplashScreen closing={closingSplash} />