diff --git a/public/offline.html b/public/offline.html
new file mode 100644
index 0000000..cf6a8a0
--- /dev/null
+++ b/public/offline.html
@@ -0,0 +1,87 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">
+  <meta name="theme-color" content="#166534">
+  <title>Offline — Route Commerce</title>
+  <style>
+    :root {
+      --color-bg: #ffffff;
+      --color-surface: #faf8f5;
+      --color-text: #1d1d1f;
+      --color-text-muted: #424245;
+      --color-accent: #166534;
+      --color-warning: #854d0e;
+    }
+    * { box-sizing: border-box; }
+    html, body { margin: 0; padding: 0; }
+    body {
+      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Manrope, system-ui, sans-serif;
+      background: var(--color-surface);
+      color: var(--color-text);
+      min-height: 100vh;
+      display: flex;
+      align-items: center;
+      justify-content: center;
+      padding: 24px;
+      -webkit-font-smoothing: antialiased;
+    }
+    .card {
+      max-width: 480px;
+      width: 100%;
+      background: var(--color-bg);
+      border-radius: 24px;
+      padding: 48px 32px;
+      text-align: center;
+      box-shadow: 0 4px 24px rgba(0,0,0,0.06);
+    }
+    .icon {
+      width: 64px;
+      height: 64px;
+      margin: 0 auto 24px;
+      background: var(--color-warning);
+      color: white;
+      border-radius: 16px;
+      display: flex;
+      align-items: center;
+      justify-content: center;
+      font-size: 32px;
+    }
+    h1 {
+      font-family: Fraunces, Georgia, serif;
+      font-size: 32px;
+      font-weight: 600;
+      margin: 0 0 12px;
+      letter-spacing: -0.01em;
+    }
+    p {
+      font-size: 18px;
+      line-height: 1.45;
+      color: var(--color-text-muted);
+      margin: 0 0 24px;
+    }
+    button {
+      background: var(--color-accent);
+      color: white;
+      border: 0;
+      border-radius: 12px;
+      padding: 16px 32px;
+      font-size: 15px;
+      font-weight: 600;
+      letter-spacing: 0.02em;
+      cursor: pointer;
+      min-height: 56px;
+    }
+    button:active { opacity: 0.85; }
+  </style>
+</head>
+<body>
+  <div class="card" role="status">
+    <div class="icon" aria-hidden="true">📡</div>
+    <h1>You're offline</h1>
+    <p>This page isn't available without a connection. Cached pages will still work. Your changes will sync when you're back online.</p>
+    <button type="button" onclick="location.reload()">Try again</button>
+  </div>
+</body>
+</html>
