diff --git a/.gitignore b/.gitignore
index e46600e..ae17148 100644
--- a/.gitignore
+++ b/.gitignore
@@ -43,3 +43,6 @@ next-env.d.ts
 # source media (web versions live in public/)
 content/*.mp4
 content/*.pdf
+
+# source copies of screen markers (served from public/set/markers)
+content/screen_markers/
diff --git a/README.md b/README.md
index 8c9fdec..f36becb 100644
--- a/README.md
+++ b/README.md
@@ -21,6 +21,24 @@ All copy (studio info, services, projects, contact email) lives in
 - **Logo:** the fox mark is a vector in `components/Fox.tsx` / `public/fox.svg`,
   traced from `G:\_ADMIN\TWOTALESLOGO.png`. Favicons are `app/icon.png` and `app/apple-icon.png`.
 
+## On-set screen markers (`/set`)
+
+`twotalesvfx.com/set` is a tool page for production crews (not linked from the site,
+not indexed). It lists screen-tracking marker images, highlights the one matching the
+device it's opened on, and shows it full-screen in one tap. It works offline after the
+first visit.
+
+To add a device, drop PNGs into `public/set/markers/` named like:
+
+```
+markers_phone_iPhone-Pro_1179x2556.png                  # full dot grid
+edge-markers_phone_iPhone-Pro_2556x1179_landscape.png   # edges only
+markers_laptop_1920x1080.png                            # name is optional
+```
+
+Kinds: `phone`, `tablet`, `laptop`, `monitor`. Any other PNG shows under "Other".
+Bump `CACHE` in `public/set/sw.js` when replacing an existing image so phones fetch the new one.
+
 ## Structure
 
 ```
diff --git a/app/(site)/layout.tsx b/app/(site)/layout.tsx
new file mode 100644
index 0000000..ab84dca
--- /dev/null
+++ b/app/(site)/layout.tsx
@@ -0,0 +1,13 @@
+import Footer from "@/components/Footer";
+import Header from "@/components/Header";
+
+// Marketing pages: header, footer and film grain. Tools like /set live outside this group.
+export default function SiteLayout({ children }: { children: React.ReactNode }) {
+  return (
+    <div className="grain flex min-h-dvh flex-col">
+      <Header />
+      <main className="flex-1">{children}</main>
+      <Footer />
+    </div>
+  );
+}
diff --git a/app/page.tsx b/app/(site)/page.tsx
similarity index 100%
rename from app/page.tsx
rename to app/(site)/page.tsx
diff --git a/app/work/[slug]/page.tsx b/app/(site)/work/[slug]/page.tsx
similarity index 100%
rename from app/work/[slug]/page.tsx
rename to app/(site)/work/[slug]/page.tsx
diff --git a/app/work/page.tsx b/app/(site)/work/page.tsx
similarity index 100%
rename from app/work/page.tsx
rename to app/(site)/work/page.tsx
diff --git a/app/layout.tsx b/app/layout.tsx
index d3f46c8..daabcff 100644
--- a/app/layout.tsx
+++ b/app/layout.tsx
@@ -1,7 +1,5 @@
 import type { Metadata, Viewport } from "next";
 import { Geist, Geist_Mono, Josefin_Sans } from "next/font/google";
-import Header from "@/components/Header";
-import Footer from "@/components/Footer";
 import { site } from "@/content/site";
 import "./globals.css";
 
@@ -40,11 +38,7 @@ export default function RootLayout({ children }: LayoutProps<"/">) {
       lang="en"
       className={`${geistSans.variable} ${geistMono.variable} ${josefin.variable} antialiased`}
     >
-      <body className="grain flex min-h-dvh flex-col font-sans">
-        <Header />
-        <main className="flex-1">{children}</main>
-        <Footer />
-      </body>
+      <body className="min-h-dvh font-sans">{children}</body>
     </html>
   );
 }
diff --git a/app/not-found.tsx b/app/not-found.tsx
index 2078c4b..375696a 100644
--- a/app/not-found.tsx
+++ b/app/not-found.tsx
@@ -1,18 +1,30 @@
 import Link from "next/link";
+import Footer from "@/components/Footer";
 import Fox from "@/components/Fox";
+import Header from "@/components/Header";
 
 export default function NotFound() {
   return (
-    <div className="flex min-h-[80vh] flex-col items-center justify-center px-5 text-center">
-      <Fox className="h-16 w-16 text-white/20" />
-      <p className="mt-8 font-mono text-xs tracking-[0.3em] text-accent uppercase">Error 404 · Frame missing</p>
-      <h1 className="mt-4 font-display text-5xl font-thin uppercase md:text-7xl">Shot not found</h1>
-      <Link
-        href="/"
-        className="mt-10 border border-white/25 px-6 py-3.5 font-mono text-xs tracking-[0.2em] uppercase hover:border-fg"
-      >
-        Back to home
-      </Link>
+    <div className="grain flex min-h-dvh flex-col">
+      <Header />
+      <main className="flex-1">
+        <div className="flex min-h-[80vh] flex-col items-center justify-center px-5 text-center">
+          <Fox className="h-16 w-16 text-white/20" />
+          <p className="mt-8 font-mono text-xs tracking-[0.3em] text-accent uppercase">
+            Error 404 · Frame missing
+          </p>
+          <h1 className="mt-4 font-display text-5xl font-thin uppercase md:text-7xl">
+            Shot not found
+          </h1>
+          <Link
+            href="/"
+            className="mt-10 border border-white/25 px-6 py-3.5 font-mono text-xs tracking-[0.2em] uppercase hover:border-fg"
+          >
+            Back to home
+          </Link>
+        </div>
+      </main>
+      <Footer />
     </div>
   );
 }
diff --git a/app/set/page.tsx b/app/set/page.tsx
new file mode 100644
index 0000000..57ddae4
--- /dev/null
+++ b/app/set/page.tsx
@@ -0,0 +1,27 @@
+import type { Metadata, Viewport } from "next";
+import MarkerPicker from "@/components/set/MarkerPicker";
+import { loadMarkers } from "@/lib/markers";
+
+// On-set screen tracking markers. Deliberately not linked from the site,
+// kept out of search results and the sitemap.
+export const metadata: Metadata = {
+  title: "Screen markers",
+  description: "Two Tales VFX screen tracking markers for production crews.",
+  robots: { index: false, follow: false },
+  manifest: "/set/manifest.webmanifest",
+  appleWebApp: { capable: true, title: "Markers", statusBarStyle: "black-translucent" },
+};
+
+export const viewport: Viewport = {
+  themeColor: "#000000",
+  viewportFit: "cover",
+};
+
+export default function SetPage() {
+  const { screens, extras } = loadMarkers();
+  return (
+    <main className="min-h-dvh bg-ink">
+      <MarkerPicker screens={screens} extras={extras} />
+    </main>
+  );
+}
diff --git a/components/set/MarkerPicker.tsx b/components/set/MarkerPicker.tsx
new file mode 100644
index 0000000..50211c5
--- /dev/null
+++ b/components/set/MarkerPicker.tsx
@@ -0,0 +1,445 @@
+"use client";
+
+import { useCallback, useEffect, useMemo, useRef, useState, useSyncExternalStore } from "react";
+import type { Kind, MarkerExtra, MarkerScreen } from "@/lib/markers";
+
+type Mode = "full" | "edge";
+type Showing = { src: string; label: string; detail: string; screen?: MarkerScreen; extra?: MarkerExtra };
+
+const KIND_LABEL: Record<Kind, string> = { phone: "Phones", tablet: "Tablets", laptop: "Laptops", monitor: "Monitors" };
+const MODE_KEY = "ttvfx-set-mode";
+
+function detectScreen() {
+  const dpr = window.devicePixelRatio || 1;
+  let w = Math.round(window.screen.width * dpr);
+  let h = Math.round(window.screen.height * dpr);
+  const landscape = window.matchMedia("(orientation: landscape)").matches;
+  // iOS reports screen size in portrait regardless of rotation
+  if (landscape !== w > h) [w, h] = [h, w];
+  return { w, h, landscape };
+}
+
+function bestMatch(screens: MarkerScreen[], w: number, h: number) {
+  const pool = screens.filter((s) => s.width > s.height === w > h);
+  const candidates = pool.length ? pool : screens;
+  let best: { s: MarkerScreen; score: number } | null = null;
+  for (const s of candidates) {
+    const aspect = Math.abs(s.width / s.height - w / h);
+    const size = Math.abs(s.width * s.height - w * h) / (s.width * s.height);
+    const score = aspect * 10 + size;
+    if (!best || score < best.score) best = { s, score };
+  }
+  if (!best) return null;
+  const exact = Math.abs(best.s.width - w) <= 2 && Math.abs(best.s.height - h) <= 2;
+  return { screen: best.s, exact };
+}
+
+function srcFor(s: MarkerScreen, mode: Mode) {
+  return (mode === "edge" ? s.edge : s.full) ?? s.full ?? s.edge ?? "";
+}
+
+function Shape({ w, h, active }: { w: number; h: number; active?: boolean }) {
+  const scale = 34 / Math.max(w, h);
+  return (
+    <span className="flex h-10 w-10 shrink-0 items-center justify-center">
+      <span
+        className={`block rounded-[3px] border-2 ${active ? "border-accent bg-accent/20" : "border-white/60"}`}
+        style={{ width: Math.max(10, w * scale), height: Math.max(10, h * scale) }}
+      />
+    </span>
+  );
+}
+
+// --- Browser-owned state, read via useSyncExternalStore -------------------
+// The URL hash says which marker is open (#<screen-id>/<full|edge> or #<extra-id>),
+// so share links, refresh and the back button all behave the same way.
+const HASH_EVENT = "ttvfx-set-hash";
+const MODE_EVENT = "ttvfx-set-mode";
+
+function subscribe(events: string[]) {
+  return (cb: () => void) => {
+    events.forEach((e) => window.addEventListener(e, cb));
+    return () => events.forEach((e) => window.removeEventListener(e, cb));
+  };
+}
+const subscribeHash = subscribe(["popstate", "hashchange", HASH_EVENT]);
+const subscribeMode = subscribe(["storage", MODE_EVENT]);
+const subscribeScreen = subscribe(["resize", "orientationchange"]);
+
+function setHash(hash: string, push: boolean) {
+  history[push ? "pushState" : "replaceState"]({ marker: Boolean(hash) }, "", hash || location.pathname);
+  window.dispatchEvent(new Event(HASH_EVENT));
+}
+
+function readMode(): Mode {
+  try {
+    return localStorage.getItem(MODE_KEY) === "edge" ? "edge" : "full";
+  } catch {
+    return "full";
+  }
+}
+function writeMode(m: Mode) {
+  try {
+    localStorage.setItem(MODE_KEY, m);
+  } catch {}
+  window.dispatchEvent(new Event(MODE_EVENT));
+}
+
+function screenKey() {
+  const { w, h } = detectScreen();
+  return w > 0 && h > 0 ? `${w}x${h}` : ""; // some browsers report 0×0 while hidden
+}
+
+function iosNeedsTip() {
+  const ios = /iPhone|iPod/.test(navigator.userAgent);
+  const standalone = window.matchMedia("(display-mode: standalone), (display-mode: fullscreen)").matches;
+  return ios && !standalone;
+}
+
+function requestFullscreen() {
+  if (document.fullscreenEnabled && !document.fullscreenElement) {
+    document.documentElement.requestFullscreen?.().catch(() => {});
+  }
+}
+
+export default function MarkerPicker({ screens, extras }: { screens: MarkerScreen[]; extras: MarkerExtra[] }) {
+  const hash = useSyncExternalStore(subscribeHash, () => location.hash, () => "");
+  const mode = useSyncExternalStore(subscribeMode, readMode, () => "full" as Mode);
+  const key = useSyncExternalStore(subscribeScreen, screenKey, () => "");
+  const iosTip = useSyncExternalStore(() => () => {}, iosNeedsTip, () => false);
+  const [offline, setOffline] = useState<"idle" | "saving" | "ready">("idle");
+
+  const device = useMemo(() => {
+    if (!key) return null;
+    const [w, h] = key.split("x").map(Number);
+    return { w, h };
+  }, [key]);
+  const match = useMemo(() => (device ? bestMatch(screens, device.w, device.h) : null), [device, screens]);
+
+  // What the viewer shows, derived from the hash
+  const showing = useMemo<(Showing & { mode: Mode }) | null>(() => {
+    const [id, m] = hash.slice(1).split("/");
+    if (!id) return null;
+    const viewMode: Mode = m === "edge" ? "edge" : "full";
+    const s = screens.find((x) => x.id === id);
+    if (s)
+      return {
+        src: srcFor(s, viewMode),
+        label: s.name,
+        detail: `${s.width}×${s.height}${s.landscape ? " · landscape" : ""}`,
+        screen: s,
+        mode: viewMode,
+      };
+    const e = extras.find((x) => x.id === id);
+    return e ? { src: e.src, label: e.name, detail: "", extra: e, mode: viewMode } : null;
+  }, [hash, screens, extras]);
+
+  // Leave browser full screen whenever the viewer closes (incl. back button)
+  useEffect(() => {
+    if (!showing && document.fullscreenElement) document.exitFullscreen?.().catch(() => {});
+  }, [showing]);
+
+  // Offline: register the service worker, then warm its cache with every marker
+  useEffect(() => {
+    if (process.env.NODE_ENV !== "production" || !("serviceWorker" in navigator)) return;
+    navigator.serviceWorker
+      .register("/set/sw.js", { scope: "/set/" })
+      .then(async () => {
+        setOffline("saving");
+        const urls = [...screens.flatMap((s) => [s.full, s.edge]), ...extras.map((e) => e.src)].filter(Boolean) as string[];
+        await Promise.all(urls.map((u) => fetch(u).catch(() => null)));
+        setOffline("ready");
+      })
+      .catch(() => {});
+  }, [screens, extras]);
+
+  const showScreen = (s: MarkerScreen) => {
+    setHash(`#${s.id}/${mode}`, true);
+    requestFullscreen();
+  };
+  const showExtra = (e: MarkerExtra) => {
+    setHash(`#${e.id}`, true);
+    requestFullscreen();
+  };
+  const close = useCallback(() => {
+    if (history.state?.marker) history.back();
+    else setHash("", false);
+  }, []);
+  const switchMode = useCallback(
+    (m: Mode) => {
+      writeMode(m);
+      if (showing?.screen) setHash(`#${showing.screen.id}/${m}`, false);
+    },
+    [showing],
+  );
+  const chooseMode = writeMode;
+
+  const grouped = useMemo(() => {
+    const out = new Map<Kind, MarkerScreen[]>();
+    for (const s of screens) out.set(s.kind, [...(out.get(s.kind) ?? []), s]);
+    return [...out.entries()];
+  }, [screens]);
+
+  return (
+    <div className="mx-auto max-w-2xl px-4 pt-6 pb-24">
+      <header className="flex items-start justify-between gap-4">
+        <div>
+          <p className="font-mono text-[11px] tracking-[0.25em] text-accent uppercase">Two Tales VFX · On set</p>
+          <h1 className="mt-1 font-display text-3xl font-light tracking-wide uppercase">Screen markers</h1>
+        </div>
+        <p className="pt-1 text-right font-mono text-[11px] leading-relaxed text-muted">
+          {offline === "ready" ? "✓ Works offline" : offline === "saving" ? "Saving for offline…" : ""}
+        </p>
+      </header>
+
+      {/* Marker style */}
+      <div className="mt-6 grid grid-cols-2 gap-2 rounded-xl bg-white/5 p-1.5" role="radiogroup" aria-label="Marker style">
+        {(
+          [
+            ["full", "Full grid", "Dots across the whole screen"],
+            ["edge", "Edges only", "Clear centre for actors' hands"],
+          ] as const
+        ).map(([m, label, hint]) => (
+          <button
+            key={m}
+            type="button"
+            role="radio"
+            aria-checked={mode === m}
+            onClick={() => chooseMode(m)}
+            className={`min-h-16 rounded-lg px-3 py-2.5 text-left transition-colors ${
+              mode === m ? "bg-fg text-ink" : "text-fg hover:bg-white/5"
+            }`}
+          >
+            <span className="block text-base font-medium">{label}</span>
+            <span className={`block text-xs ${mode === m ? "text-ink/70" : "text-muted"}`}>{hint}</span>
+          </button>
+        ))}
+      </div>
+
+      {/* This screen */}
+      {match && device && (
+        <section className="mt-6">
+          <h2 className="mb-2 font-mono text-[11px] tracking-[0.25em] text-muted uppercase">This screen</h2>
+          <button
+            type="button"
+            onClick={() => showScreen(match.screen)}
+            className="flex min-h-24 w-full items-center gap-4 rounded-xl border-2 border-accent bg-accent/10 px-4 py-4 text-left active:bg-accent/25"
+          >
+            <Shape w={match.screen.width} h={match.screen.height} active />
+            <span className="min-w-0 flex-1">
+              <span className="block text-xl font-medium">{match.screen.name}</span>
+              <span className="block font-mono text-xs text-muted">
+                {match.screen.width}×{match.screen.height}
+                {match.screen.landscape ? " · landscape" : ""} ·{" "}
+                {match.exact ? "exact match" : `closest to ${device.w}×${device.h}`}
+              </span>
+            </span>
+            <span className="shrink-0 rounded-lg bg-accent px-4 py-3 text-sm font-semibold text-ink">Show</span>
+          </button>
+        </section>
+      )}
+
+      {iosTip && (
+        <p className="mt-4 rounded-lg bg-white/5 px-4 py-3 text-sm leading-relaxed text-muted">
+          <span className="text-fg">iPhone tip:</span> Safari can&apos;t hide its bars. For true full screen tap{" "}
+          <span className="text-fg">Share → Add to Home Screen</span> once, then open “Markers” from the home screen.
+        </p>
+      )}
+
+      {/* All screens */}
+      {grouped.map(([kind, list]) => (
+        <section key={kind} className="mt-8">
+          <h2 className="mb-2 font-mono text-[11px] tracking-[0.25em] text-muted uppercase">{KIND_LABEL[kind]}</h2>
+          <ul className="divide-y divide-white/10 overflow-hidden rounded-xl bg-white/[0.04]">
+            {list.map((s) => {
+              const isMatch = match?.screen.id === s.id;
+              return (
+                <li key={s.id}>
+                  <button
+                    type="button"
+                    onClick={() => showScreen(s)}
+                    className="flex min-h-16 w-full items-center gap-4 px-4 py-3 text-left active:bg-white/10"
+                  >
+                    <Shape w={s.width} h={s.height} active={isMatch} />
+                    <span className="min-w-0 flex-1">
+                      <span className="block text-base">{s.name}</span>
+                      <span className="block font-mono text-xs text-muted">
+                        {s.width}×{s.height}
+                        {s.landscape ? " · landscape" : " · portrait"}
+                      </span>
+                    </span>
+                    {isMatch && <span className="font-mono text-[10px] tracking-widest text-accent uppercase">This</span>}
+                    <span className="text-xl text-muted" aria-hidden="true">
+                      ›
+                    </span>
+                  </button>
+                </li>
+              );
+            })}
+          </ul>
+        </section>
+      ))}
+
+      {extras.length > 0 && (
+        <section className="mt-8">
+          <h2 className="mb-2 font-mono text-[11px] tracking-[0.25em] text-muted uppercase">Other</h2>
+          <ul className="divide-y divide-white/10 overflow-hidden rounded-xl bg-white/[0.04]">
+            {extras.map((e) => (
+              <li key={e.id}>
+                <button
+                  type="button"
+                  onClick={() => showExtra(e)}
+                  className="flex min-h-16 w-full items-center gap-4 px-4 py-3 text-left active:bg-white/10"
+                >
+                  <span className="flex h-10 w-10 shrink-0 items-center justify-center">
+                    <span className="block h-7 w-7 rounded-[3px] bg-[#808080]" />
+                  </span>
+                  <span className="flex-1 text-base">{e.name}</span>
+                  <span className="text-xl text-muted" aria-hidden="true">
+                    ›
+                  </span>
+                </button>
+              </li>
+            ))}
+          </ul>
+        </section>
+      )}
+
+      <p className="mt-10 text-center text-xs leading-relaxed text-muted">
+        Tap the image for controls · Back or Esc to close · Screen stays awake while showing
+      </p>
+
+      {showing && (
+        <Viewer showing={showing} mode={showing.mode} onMode={switchMode} onClose={close} />
+      )}
+    </div>
+  );
+}
+
+function Viewer({
+  showing,
+  mode,
+  onMode,
+  onClose,
+}: {
+  showing: Showing;
+  mode: Mode;
+  onMode: (m: Mode) => void;
+  onClose: () => void;
+}) {
+  const [controls, setControls] = useState(false);
+  const [fullscreen, setFullscreen] = useState(false);
+  const hideTimer = useRef<number | undefined>(undefined);
+  // Stretch to fill when the image's shape is close to the visible area (markers sit on
+  // the real screen edges); otherwise fit it whole so the dots stay round.
+  const viewport = useSyncExternalStore(subscribeScreen, () => `${innerWidth}x${innerHeight}`, () => "1x1");
+  const fit = useMemo(() => {
+    if (!showing.screen) return "object-cover";
+    const [vw, vh] = viewport.split("x").map(Number);
+    const ratio = showing.screen.width / showing.screen.height / (vw / vh);
+    return Math.abs(ratio - 1) <= 0.15 ? "object-fill" : "object-contain";
+  }, [showing.screen, viewport]);
+  const canFullscreen = typeof document !== "undefined" && document.fullscreenEnabled;
+
+  // Keep the screen awake while a marker is up
+  useEffect(() => {
+    let lock: WakeLockSentinel | null = null;
+    const acquire = async () => {
+      try {
+        lock = (await navigator.wakeLock?.request("screen")) ?? null;
+      } catch {}
+    };
+    const onVisible = () => document.visibilityState === "visible" && acquire();
+    acquire();
+    document.addEventListener("visibilitychange", onVisible);
+    document.body.style.overflow = "hidden";
+    return () => {
+      document.removeEventListener("visibilitychange", onVisible);
+      document.body.style.overflow = "";
+      lock?.release().catch(() => {});
+    };
+  }, []);
+
+  useEffect(() => {
+    const onFs = () => setFullscreen(Boolean(document.fullscreenElement));
+    onFs();
+    document.addEventListener("fullscreenchange", onFs);
+    const onKey = (e: KeyboardEvent) => {
+      if (e.key === "Escape" && !document.fullscreenElement) onClose();
+      if (e.key === "f") onMode("full");
+      if (e.key === "e") onMode("edge");
+      if (e.key === " ") setControls((v) => !v);
+    };
+    document.addEventListener("keydown", onKey);
+    return () => {
+      document.removeEventListener("fullscreenchange", onFs);
+      document.removeEventListener("keydown", onKey);
+    };
+  }, [onClose, onMode]);
+
+  const poke = () => {
+    window.clearTimeout(hideTimer.current);
+    setControls((v) => {
+      if (!v) hideTimer.current = window.setTimeout(() => setControls(false), 4000);
+      return !v;
+    });
+  };
+
+  return (
+    <div
+      className={`fixed inset-0 z-[100] bg-black ${controls ? "" : "cursor-none"}`}
+      onClick={() => {
+        if (canFullscreen && !document.fullscreenElement) document.documentElement.requestFullscreen?.().catch(() => {});
+        poke();
+      }}
+    >
+      {/* eslint-disable-next-line @next/next/no-img-element */}
+      <img src={showing.src} alt={showing.label} className={`h-full w-full select-none ${fit}`} draggable={false} />
+
+      {canFullscreen && !fullscreen && !controls && (
+        <p className="pointer-events-none absolute inset-x-0 bottom-6 text-center font-mono text-xs text-white/70">
+          Tap for full screen
+        </p>
+      )}
+
+      {controls && (
+        <div
+          className="absolute inset-x-0 top-0 flex flex-wrap items-center gap-2 bg-black/85 px-3 pt-[max(0.75rem,env(safe-area-inset-top))] pb-3"
+          onClick={(e) => e.stopPropagation()}
+        >
+          <button
+            type="button"
+            onClick={onClose}
+            className="min-h-12 rounded-lg bg-white/10 px-4 text-sm font-medium text-fg active:bg-white/20"
+          >
+            ✕ Close
+          </button>
+          {showing.screen && (
+            <div className="flex rounded-lg bg-white/10 p-1">
+              {(["full", "edge"] as const).map((m) => (
+                <button
+                  key={m}
+                  type="button"
+                  onClick={() => onMode(m)}
+                  className={`min-h-10 rounded-md px-3 text-sm ${mode === m ? "bg-fg text-ink" : "text-fg"}`}
+                >
+                  {m === "full" ? "Full grid" : "Edges"}
+                </button>
+              ))}
+            </div>
+          )}
+          <span className="min-w-0 flex-1 truncate px-1 text-right font-mono text-xs text-white/70">
+            {showing.label} {showing.detail && `· ${showing.detail}`}
+          </span>
+          <a
+            href={showing.src}
+            download
+            className="flex min-h-12 items-center rounded-lg bg-white/10 px-4 text-sm text-fg active:bg-white/20"
+          >
+            Save
+          </a>
+        </div>
+      )}
+    </div>
+  );
+}
diff --git a/docker/nginx.conf b/docker/nginx.conf
index 2e350bc..20f95db 100644
--- a/docker/nginx.conf
+++ b/docker/nginx.conf
@@ -23,6 +23,16 @@ server {
         add_header Cache-Control "public, max-age=604800";
     }
 
+    # Offline worker for /set must always be revalidated so updates roll out
+    location = /set/sw.js {
+        add_header Cache-Control "no-cache";
+    }
+
+    location ~* \.webmanifest$ {
+        types { application/manifest+json webmanifest; }
+        add_header Cache-Control "no-cache";
+    }
+
     error_page 404 /404.html;
 
     gzip on;
diff --git a/lib/markers.ts b/lib/markers.ts
new file mode 100644
index 0000000..d6792d6
--- /dev/null
+++ b/lib/markers.ts
@@ -0,0 +1,85 @@
+import fs from "node:fs";
+import path from "node:path";
+
+// Screen-tracking marker images for on-set use (served at /set).
+// Files live in public/set/markers and are discovered at build time, so adding
+// a device is just dropping in a PNG named like:
+//   markers_phone_iPhone-Pro_1179x2556.png
+//   edge-markers_phone_iPhone-Pro_2556x1179_landscape.png
+//   markers_laptop_1920x1080.png            (no device name)
+//   plain_grey_128.png                      (anything else = "extra")
+
+export type Kind = "phone" | "tablet" | "laptop" | "monitor";
+
+export type MarkerScreen = {
+  id: string; // stable key, e.g. "phone-iphone-pro-1179x2556"
+  kind: Kind;
+  name: string; // "iPhone Pro"
+  width: number;
+  height: number;
+  landscape: boolean;
+  full?: string; // /set/markers/markers_….png
+  edge?: string; // /set/markers/edge-markers_….png
+};
+
+export type MarkerExtra = { id: string; name: string; src: string };
+
+const DIR = path.join(process.cwd(), "public", "set", "markers");
+const URL_BASE = "/set/markers/";
+const ORDER: Kind[] = ["phone", "tablet", "laptop", "monitor"];
+
+const PATTERN = /^(edge-markers|markers)_(phone|tablet|laptop|monitor)_(?:(.+?)_)?(\d+)x(\d+)(_landscape)?\.png$/i;
+
+function prettyName(raw: string | undefined, kind: Kind, w: number, h: number) {
+  if (!raw) {
+    if (kind === "laptop" && Math.max(w, h) === 1920) return "Laptop Full HD";
+    return `${kind[0].toUpperCase()}${kind.slice(1)} ${w}×${h}`;
+  }
+  return raw
+    .replace(/-/g, " ")
+    .replace(/ProMax/g, "Pro Max")
+    .replace(/(\d+(\.\d+)?)$/, "$1″")
+    .replace(/^4K$/, "4K Monitor");
+}
+
+export function loadMarkers(): { screens: MarkerScreen[]; extras: MarkerExtra[] } {
+  const files = fs.existsSync(DIR) ? fs.readdirSync(DIR).filter((f) => f.toLowerCase().endsWith(".png")) : [];
+  const screens = new Map<string, MarkerScreen>();
+  const extras: MarkerExtra[] = [];
+
+  for (const file of files.sort()) {
+    const m = file.match(PATTERN);
+    if (!m) {
+      const name = file
+        .replace(/\.png$/i, "")
+        .replace(/[_-]+/g, " ")
+        .replace(/\b\w/g, (c) => c.toUpperCase());
+      extras.push({ id: file.replace(/\.png$/i, "").toLowerCase(), name, src: URL_BASE + file });
+      continue;
+    }
+    const [, variant, kindRaw, rawName, w, h, land] = m;
+    const kind = kindRaw.toLowerCase() as Kind;
+    const width = Number(w);
+    const height = Number(h);
+    const id = `${kind}-${(rawName ?? "generic").toLowerCase()}-${width}x${height}`;
+    const screen = screens.get(id) ?? {
+      id,
+      kind,
+      name: prettyName(rawName, kind, width, height),
+      width,
+      height,
+      landscape: Boolean(land) || width > height,
+    };
+    if (variant.toLowerCase() === "edge-markers") screen.edge = URL_BASE + file;
+    else screen.full = URL_BASE + file;
+    screens.set(id, screen);
+  }
+
+  const sorted = [...screens.values()].sort(
+    (a, b) =>
+      ORDER.indexOf(a.kind) - ORDER.indexOf(b.kind) ||
+      a.name.localeCompare(b.name) ||
+      Number(a.landscape) - Number(b.landscape),
+  );
+  return { screens: sorted, extras };
+}
diff --git a/public/set/manifest.webmanifest b/public/set/manifest.webmanifest
new file mode 100644
index 0000000..3dadc39
--- /dev/null
+++ b/public/set/manifest.webmanifest
@@ -0,0 +1,14 @@
+{
+  "name": "Two Tales VFX Screen Markers",
+  "short_name": "Markers",
+  "start_url": "/set/",
+  "scope": "/set/",
+  "display": "fullscreen",
+  "orientation": "any",
+  "background_color": "#000000",
+  "theme_color": "#000000",
+  "icons": [
+    { "src": "/icon.png", "sizes": "512x512", "type": "image/png" },
+    { "src": "/apple-icon.png", "sizes": "180x180", "type": "image/png" }
+  ]
+}
diff --git a/public/set/markers/edge-markers_laptop_1920x1080.png b/public/set/markers/edge-markers_laptop_1920x1080.png
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index 0000000..29e521c
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diff --git a/public/set/markers/edge-markers_laptop_MacBook-Pro_3024x1964.png b/public/set/markers/edge-markers_laptop_MacBook-Pro_3024x1964.png
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index 0000000..0fa9086
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diff --git a/public/set/markers/edge-markers_laptop_MacBook_2560x1600.png b/public/set/markers/edge-markers_laptop_MacBook_2560x1600.png
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index 0000000..ec80058
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diff --git a/public/set/markers/edge-markers_monitor_4K_3840x2160.png b/public/set/markers/edge-markers_monitor_4K_3840x2160.png
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index 0000000..ec9c981
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diff --git a/public/set/markers/edge-markers_phone_Android_1080x2400.png b/public/set/markers/edge-markers_phone_Android_1080x2400.png
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index 0000000..37aa06f
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diff --git a/public/set/markers/edge-markers_phone_Android_2400x1080_landscape.png b/public/set/markers/edge-markers_phone_Android_2400x1080_landscape.png
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diff --git a/public/set/markers/edge-markers_phone_iPhone-ProMax_1290x2796.png b/public/set/markers/edge-markers_phone_iPhone-ProMax_1290x2796.png
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index 0000000..31020ab
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diff --git a/public/set/markers/edge-markers_phone_iPhone-ProMax_2796x1290_landscape.png b/public/set/markers/edge-markers_phone_iPhone-ProMax_2796x1290_landscape.png
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index 0000000..09e6e67
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diff --git a/public/set/markers/edge-markers_phone_iPhone-Pro_1179x2556.png b/public/set/markers/edge-markers_phone_iPhone-Pro_1179x2556.png
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diff --git a/public/set/markers/edge-markers_phone_iPhone-Pro_2556x1179_landscape.png b/public/set/markers/edge-markers_phone_iPhone-Pro_2556x1179_landscape.png
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index 0000000..3692a59
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diff --git a/public/set/markers/edge-markers_phone_iPhone_1170x2532.png b/public/set/markers/edge-markers_phone_iPhone_1170x2532.png
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index 0000000..e02389c
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diff --git a/public/set/markers/edge-markers_phone_iPhone_2532x1170_landscape.png b/public/set/markers/edge-markers_phone_iPhone_2532x1170_landscape.png
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index 0000000..9b14284
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diff --git a/public/set/markers/edge-markers_tablet_iPad-Pro-12.9_2048x2732.png b/public/set/markers/edge-markers_tablet_iPad-Pro-12.9_2048x2732.png
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index 0000000..2bb20cb
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diff --git a/public/set/markers/edge-markers_tablet_iPad_1640x2360.png b/public/set/markers/edge-markers_tablet_iPad_1640x2360.png
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diff --git a/public/set/markers/markers_laptop_1920x1080.png b/public/set/markers/markers_laptop_1920x1080.png
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diff --git a/public/set/markers/markers_laptop_MacBook-Pro_3024x1964.png b/public/set/markers/markers_laptop_MacBook-Pro_3024x1964.png
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diff --git a/public/set/markers/markers_laptop_MacBook_2560x1600.png b/public/set/markers/markers_laptop_MacBook_2560x1600.png
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diff --git a/public/set/markers/markers_monitor_4K_3840x2160.png b/public/set/markers/markers_monitor_4K_3840x2160.png
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index 0000000..859c08b
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diff --git a/public/set/markers/markers_phone_Android_1080x2400.png b/public/set/markers/markers_phone_Android_1080x2400.png
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index 0000000..c010a61
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diff --git a/public/set/markers/markers_phone_Android_2400x1080_landscape.png b/public/set/markers/markers_phone_Android_2400x1080_landscape.png
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diff --git a/public/set/markers/markers_phone_iPhone_1170x2532.png b/public/set/markers/markers_phone_iPhone_1170x2532.png
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diff --git a/public/set/markers/markers_phone_iPhone_2532x1170_landscape.png b/public/set/markers/markers_phone_iPhone_2532x1170_landscape.png
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diff --git a/public/set/markers/markers_tablet_iPad-Pro-12.9_2048x2732.png b/public/set/markers/markers_tablet_iPad-Pro-12.9_2048x2732.png
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diff --git a/public/set/markers/markers_tablet_iPad_1640x2360.png b/public/set/markers/markers_tablet_iPad_1640x2360.png
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diff --git a/public/set/markers/plain_grey_128.png b/public/set/markers/plain_grey_128.png
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diff --git a/public/set/sw.js b/public/set/sw.js
new file mode 100644
index 0000000..64e8860
--- /dev/null
+++ b/public/set/sw.js
@@ -0,0 +1,54 @@
+// Offline cache for /set (screen markers). Crews often have no signal on set:
+// once the page has loaded once, it and every marker image work offline.
+const CACHE = "ttvfx-set-v1";
+
+self.addEventListener("install", (event) => {
+  event.waitUntil(caches.open(CACHE).then((c) => c.addAll(["/set/"])).then(() => self.skipWaiting()));
+});
+
+self.addEventListener("activate", (event) => {
+  event.waitUntil(
+    caches
+      .keys()
+      .then((keys) => Promise.all(keys.filter((k) => k.startsWith("ttvfx-set-") && k !== CACHE).map((k) => caches.delete(k))))
+      .then(() => self.clients.claim()),
+  );
+});
+
+self.addEventListener("fetch", (event) => {
+  const req = event.request;
+  if (req.method !== "GET") return;
+  const url = new URL(req.url);
+  if (url.origin !== self.location.origin) return;
+
+  // Page: network first so updates arrive, cached copy when offline
+  if (req.mode === "navigate") {
+    event.respondWith(
+      fetch(req)
+        .then((res) => {
+          const copy = res.clone();
+          caches.open(CACHE).then((c) => c.put("/set/", copy));
+          return res;
+        })
+        .catch(() => caches.match("/set/")),
+    );
+    return;
+  }
+
+  // Marker images, build assets, fonts, icons: cache first
+  if (url.pathname.startsWith("/set/") || url.pathname.startsWith("/_next/") || /\.(png|woff2|webmanifest)$/.test(url.pathname)) {
+    event.respondWith(
+      caches.match(req).then(
+        (hit) =>
+          hit ||
+          fetch(req).then((res) => {
+            if (res.ok) {
+              const copy = res.clone();
+              caches.open(CACHE).then((c) => c.put(req, copy));
+            }
+            return res;
+          }),
+      ),
+    );
+  }
+});