diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 0000000..e5fac2c
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,7 @@
+.git
+.pi
+.pi-subagents
+node_modules
+npm-debug.log*
+Dockerfile
+README.md
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..658aeeb
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,15 @@
+FROM node:22-bookworm-slim
+
+WORKDIR /app
+ENV NODE_ENV=production
+
+COPY package.json package-lock.json ./
+RUN npm ci --omit=dev
+
+COPY public ./public
+COPY server ./server
+COPY shared ./shared
+
+USER node
+EXPOSE 8090
+CMD ["node", "server/index.js"]
diff --git a/public/app.css b/public/app.css
index c7fcc75..d5df6e6 100644
--- a/public/app.css
+++ b/public/app.css
@@ -377,6 +377,70 @@ body.show-fids .field[data-fid]::after{ opacity:1; }
 .sw-ref{ background:var(--ink-3); border-top:1px dashed var(--ink-3); background:none; height:0; border-bottom:1.5px dashed var(--ink-3); }
 .curve-wrap{ border-radius:var(--radius-md); overflow:hidden; border:1px solid var(--line); }
 
+/* ─── PWA and mobile layout ───────────────────────────────────────────── */
+.connection-status{
+  position:sticky; top:var(--header-h); z-index:29; padding:8px 14px;
+  background:var(--warn-bg); border-bottom:1px solid #E8D49E; color:#705318;
+  font-size:13px; font-weight:600; text-align:center;
+}
+.connection-status.hidden{ display:none; }
+
+@media (max-width:720px){
+  :root{ --header-h:auto; }
+  body{ font-size:16px; padding-bottom:env(safe-area-inset-bottom); }
+  .app-header{
+    position:sticky; padding:10px 12px; gap:10px;
+    padding-top:max(10px, env(safe-area-inset-top));
+  }
+  .brand{ width:100%; justify-content:space-between; }
+  .brand-mark{ font-size:24px; }
+  .brand-text h1{ font-size:16px; }
+  .brand-sub{ font-size:12px; }
+  .section-nav{ width:100%; order:2; margin:0 -2px; }
+  .section-nav a{ min-height:40px; display:inline-flex; align-items:center; padding:7px 12px; }
+  .header-actions{
+    order:3; width:100%; display:grid; grid-template-columns:repeat(3, minmax(0, 1fr)); gap:7px;
+  }
+  .header-divider{ display:none; }
+  .ghost-btn, .primary-btn, label.filebtn{
+    min-height:44px; padding:8px 6px; font-size:12px; text-align:center;
+  }
+  .autosave-chip{ grid-column:1 / -1; justify-content:center; min-height:32px; margin:0; }
+  .workspace-grid{ padding:14px 10px 48px; gap:14px; }
+  .panel-card{ margin-bottom:14px; border-radius:12px; }
+  .panel-head{ padding:14px; align-items:flex-start; }
+  .panel-head h2{ font-size:16px; padding-top:4px; }
+  .panel-body{ padding:14px; }
+  .field-grid{ grid-template-columns:1fr; gap:12px; }
+  .field-input, .text-input{ min-height:44px; font-size:16px; }
+  .field-input.sm{ font-size:16px; }
+  .segmented{ display:flex; width:100%; }
+  .seg-opt{ flex:1 1 auto; }
+  .seg-opt span{ min-height:40px; display:flex; align-items:center; justify-content:center; padding:6px 9px; text-align:center; white-space:normal; }
+  .chip-group{ gap:7px; }
+  .chip-opt{ flex:1 1 auto; }
+  .chip-opt span{ min-height:40px; justify-content:center; width:100%; padding:7px 10px; text-align:center; }
+  .blend-card{ padding:12px; gap:10px; }
+  .blend-remove, .actuator-remove, .icon-btn{ min-width:44px; min-height:44px; }
+  .milestone-row, .milestone-row.log-row{ padding:12px 0; }
+  .milestone-plan{ min-height:40px; display:flex; align-items:center; justify-content:center; }
+  .actuator-step{ gap:0; }
+  .actuator-rail{ display:none; }
+  .actuator-card{ padding:12px; }
+  .dock-card{ padding:14px; border-radius:12px; }
+  .checks-grid{ grid-template-columns:1fr; }
+  .check-tile{ min-height:76px; }
+  .curve-wrap{ overflow-x:auto; }
+  #curve-svg-live{ min-width:520px; }
+  .drawer{ width:100%; max-width:none; }
+  .drawer-head{ padding:14px; }
+  .drawer-body{ padding:14px; }
+}
+
+@media (prefers-reduced-motion:reduce){
+  *, *::before, *::after{ animation-duration:.01ms !important; animation-iteration-count:1 !important; scroll-behavior:auto !important; transition-duration:.01ms !important; }
+}
+
 /* ─── Print: hide the screen shell, show the paper worksheet ───────────── */
 #print-sheet{ display:none; }
 .pv{ display:none; }
diff --git a/public/icon.svg b/public/icon.svg
new file mode 100644
index 0000000..6a8986c
--- /dev/null
+++ b/public/icon.svg
@@ -0,0 +1,7 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512">
+  <rect width="512" height="512" rx="96" fill="#FBF8F4"/>
+  <circle cx="256" cy="256" r="176" fill="#A8481A"/>
+  <path fill="#FBF8F4" d="M166 166h180v45h-135v90h116v45H211v-90h-45z"/>
+  <path fill="#FBEFE6" d="M256 118c43 54 71 91 71 133a71 71 0 1 1-142 0c0-42 28-79 71-133Z" opacity=".9"/>
+  <path fill="#A8481A" d="M233 189c-13 22-20 42-20 60a43 43 0 1 0 86 0c0-18-7-38-20-60 3 10 4 19 4 28 0 23-12 42-27 42s-27-19-27-42c0-9 1-18 4-28Z"/>
+</svg>
diff --git a/public/index.html b/public/index.html
index adb2e20..ca9f4a0 100644
--- a/public/index.html
+++ b/public/index.html
@@ -4,6 +4,12 @@
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <title>Roast Planner</title>
+<meta name="theme-color" content="#A8481A">
+<meta name="apple-mobile-web-app-capable" content="yes">
+<meta name="apple-mobile-web-app-status-bar-style" content="default">
+<link rel="manifest" href="/manifest.webmanifest">
+<link rel="icon" href="/icon.svg" type="image/svg+xml">
+<link rel="apple-touch-icon" href="/icon.svg">
 <link rel="stylesheet" href="/worksheet.css" media="print">
 <link rel="stylesheet" href="/app.css">
 </head>
@@ -41,6 +47,7 @@
   </div>
 </header>
 
+<div class="connection-status hidden" id="connection-status" role="status" aria-live="polite"></div>
 <div class="drawer-overlay hidden" id="drawer-overlay"></div>
 
 <aside class="drawer hidden" id="panel-prefill" aria-hidden="true">
diff --git a/public/js/main.js b/public/js/main.js
index 4074e31..8eb658d 100644
--- a/public/js/main.js
+++ b/public/js/main.js
@@ -494,6 +494,27 @@ function wireToolbar() {
   });
 }
 
+function wirePwa() {
+  const status = document.getElementById("connection-status");
+  const renderConnection = () => {
+    const offline = !navigator.onLine;
+    status.classList.toggle("hidden", !offline);
+    status.textContent = offline ? "Offline — changes continue saving on this device." : "";
+  };
+
+  window.addEventListener("online", renderConnection);
+  window.addEventListener("offline", renderConnection);
+  renderConnection();
+
+  if ("serviceWorker" in navigator) {
+    window.addEventListener("load", () => {
+      navigator.serviceWorker.register("/sw.js").catch((error) => {
+        console.warn("Service worker registration failed:", error);
+      });
+    });
+  }
+}
+
 function wireSectionNav() {
   const links = [...document.querySelectorAll(".section-nav a")];
   const sections = links
@@ -523,6 +544,7 @@ function init() {
   wireForm();
   wireDrawers();
   wireToolbar();
+  wirePwa();
   wireSectionNav();
   initPrefillPanel({ state, renderBlendRows: renderBlend, renderActuatorRows: renderActuators, renderFormFromPlan, recompute });
   initAlogPanel({ state, recompute });
diff --git a/public/manifest.webmanifest b/public/manifest.webmanifest
new file mode 100644
index 0000000..f43a742
--- /dev/null
+++ b/public/manifest.webmanifest
@@ -0,0 +1,18 @@
+{
+  "name": "Roast Planner",
+  "short_name": "Roast Planner",
+  "description": "Plan, record, and compare coffee roasts.",
+  "start_url": "/",
+  "scope": "/",
+  "display": "standalone",
+  "background_color": "#FBF8F4",
+  "theme_color": "#A8481A",
+  "icons": [
+    {
+      "src": "/icon.svg",
+      "sizes": "any",
+      "type": "image/svg+xml",
+      "purpose": "any maskable"
+    }
+  ]
+}
diff --git a/public/sw.js b/public/sw.js
new file mode 100644
index 0000000..4c880e0
--- /dev/null
+++ b/public/sw.js
@@ -0,0 +1,57 @@
+const CACHE_NAME = "roast-planner-static-v1";
+const APP_SHELL = [
+  "/",
+  "/index.html",
+  "/app.css",
+  "/manifest.webmanifest",
+  "/icon.svg",
+  "/js/main.js",
+  "/js/prefill-ui.js",
+  "/js/alog-ui.js",
+  "/js/print.js",
+  "/shared/fields.js",
+  "/shared/ledger.js",
+  "/shared/time.js",
+  "/shared/reference-data.js",
+  "/shared/curve.js",
+];
+
+self.addEventListener("install", (event) => {
+  event.waitUntil(caches.open(CACHE_NAME).then((cache) => cache.addAll(APP_SHELL)));
+  self.skipWaiting();
+});
+
+self.addEventListener("activate", (event) => {
+  event.waitUntil(
+    caches.keys().then((keys) => Promise.all(keys.filter((key) => key !== CACHE_NAME).map((key) => caches.delete(key)))),
+  );
+  self.clients.claim();
+});
+
+self.addEventListener("fetch", (event) => {
+  const { request } = event;
+  let url;
+  try {
+    url = new URL(request.url);
+  } catch {
+    return;
+  }
+  if (request.method !== "GET" || url.origin !== self.location.origin || url.pathname.startsWith("/api/")) return;
+
+  if (request.mode === "navigate") {
+    event.respondWith(fetch(request).catch(() => caches.match("/index.html")));
+    return;
+  }
+
+  event.respondWith(
+    caches.match(request).then((cached) => {
+      const update = fetch(request)
+        .then((response) => {
+          if (response.ok) caches.open(CACHE_NAME).then((cache) => cache.put(request, response.clone()));
+          return response;
+        })
+        .catch(() => cached);
+      return cached ?? update;
+    }),
+  );
+});