diff --git a/assets/css/custom.css b/assets/css/custom.css
index b30b4bc..ea37b32 100644
--- a/assets/css/custom.css
+++ b/assets/css/custom.css
@@ -276,48 +276,17 @@ body:not(.home) .menu { display: none; }
 }
 .proj-path__seg--last { font-weight: 700; }
 
-/* secret `doom` — a small window floating over the site, sized to the 4:3 game */
-.doom-window {
-  position: fixed;
-  top: 50%;
-  left: 50%;
-  transform: translate(-50%, -50%);
-  width: min(92vw, 640px);
-  z-index: 9999;
-  display: flex;
-  flex-direction: column;
-  background: #000;
-  border: 1px solid var(--color-text-primary);
-  box-shadow: 0 12px 48px rgba(0, 0, 0, 0.45);
-}
-.doom-window__bar {
-  display: flex;
-  align-items: center;
-  justify-content: space-between;
-  padding: 0.25rem 0.25rem 0.25rem 0.6rem;
-  font-family: var(--font-family-mono);
-  font-size: var(--font-size-small);
-  color: #fff;
-  background: #000;
-  cursor: move;
-  user-select: none;
-}
-.doom-window__close {
-  cursor: pointer;
-  color: #fff;
-  background: none;
-  border: none;
-  font: inherit;
-  line-height: 1;
-  padding: 0 0.6ch;
-}
-.doom-window__close:hover { color: #000; background: #fff; }
-.doom-window iframe {
+/* secret `doom` — runs inline as doom.sh inside a fake .doom folder, same
+   file-listing chrome as any other page. sized to the classic 4:3 game. */
+.doom-player {
   width: 100%;
   aspect-ratio: 4 / 3;
-  height: auto;
-  border: 0;
   background: #000;
+}
+.doom-player iframe {
+  width: 100%;
+  height: 100%;
+  border: 0;
   display: block;
 }
 
diff --git a/assets/js/shell.js b/assets/js/shell.js
index efd4749..53f11be 100644
--- a/assets/js/shell.js
+++ b/assets/js/shell.js
@@ -203,50 +203,44 @@
     setTimeout(function () { pre.remove(); }, 4200);
   }
 
-  // secret: `doom` boots shareware DOOM (id Software) in a draggable window
+  // secret: `doom` cds into a fake ".doom" folder and runs doom.sh — shareware
+  // DOOM (id Software), embedded inline in the same file-listing chrome as any
+  // other page (not a floating window). ".." is a real link back to wherever
+  // you typed the command from, so leaving is just normal navigation — nav.js's
+  // pjax swap restores the real page (and real breadcrumb) on its own.
   function doom() {
-    if (document.querySelector(".doom-window")) return;
-    var win = document.createElement("div");
-    win.className = "doom-window";
-    var bar = document.createElement("div");
-    bar.className = "doom-window__bar";
-    var label = document.createElement("span");
-    label.className = "doom-window__title";
-    label.textContent = "doom";
-    var close = document.createElement("button");
-    close.className = "doom-window__close";
-    close.setAttribute("aria-label", "close");
-    close.textContent = "✕";
-    var frame = document.createElement("iframe");
-    frame.src = "https://archive.org/embed/DoomsharewareEpisode";
-    frame.setAttribute("allowfullscreen", "");
-    frame.allow = "fullscreen; autoplay; gamepad";
-    bar.appendChild(label);
-    bar.appendChild(close);
-    win.appendChild(bar);
-    win.appendChild(frame);
-    document.body.appendChild(win);
+    var main = document.getElementById("main-content");
+    if (!main || document.querySelector(".doom-embed")) return;
+    var back = window.location.pathname + window.location.search;
 
-    function kill() { win.remove(); document.removeEventListener("keydown", esc); }
-    function esc(e) { if (e.key === "Escape") kill(); }
-    close.addEventListener("click", kill);
-    document.addEventListener("keydown", esc);
+    var pathEl = document.querySelector(".prompt__path");
+    if (pathEl && /\$$/.test(pathEl.innerHTML)) {
+      pathEl.innerHTML = pathEl.innerHTML.replace(/\$$/, '/<span class="prompt__seg">.doom</span>$');
+    }
 
-    // drag by the title bar (shield the iframe so it doesn't swallow the mouse)
-    bar.addEventListener("mousedown", function (e) {
-      if (e.target === close) return;
-      var r = win.getBoundingClientRect();
-      win.style.left = r.left + "px";
-      win.style.top = r.top + "px";
-      win.style.transform = "none";
-      var dx = e.clientX - r.left, dy = e.clientY - r.top;
-      frame.style.pointerEvents = "none";
-      function mv(ev) { win.style.left = (ev.clientX - dx) + "px"; win.style.top = (ev.clientY - dy) + "px"; }
-      function up() { frame.style.pointerEvents = ""; document.removeEventListener("mousemove", mv); document.removeEventListener("mouseup", up); }
-      document.addEventListener("mousemove", mv);
-      document.addEventListener("mouseup", up);
-      e.preventDefault();
-    });
+    main.innerHTML =
+      '<div class="tui tui--files filebrowser doom-embed">' +
+        '<p class="tui__cmd"><span class="tui__sym">$</span> ls</p>' +
+        '<p class="tui__cmd tui__total">total 1</p>' +
+        '<ul class="tui__ls">' +
+          '<li><a href="' + back + '" data-name="..">' +
+            '<span class="tui__perm">drwxr-xr-x</span><span class="tui__name">..</span>' +
+          '</a></li>' +
+          '<li><a data-name="doom.sh" class="is-selected">' +
+            '<span class="tui__perm">-rwxr-xr-x</span><span class="tui__name">doom.sh</span>' +
+          '</a></li>' +
+        '</ul>' +
+        '<figure class="tui__preview">' +
+          '<div class="doom-player">' +
+            '<iframe src="https://archive.org/embed/DoomsharewareEpisode" allowfullscreen allow="fullscreen; autoplay; gamepad"></iframe>' +
+          '</div>' +
+          '<figcaption class="tui__status">doom.sh — running</figcaption>' +
+        '</figure>' +
+      '</div>';
+
+    // re-run the same wiring a real pjax navigation would (file-row hover/
+    // click, route rebuilding) against this injected markup
+    document.dispatchEvent(new CustomEvent("pjax:load"));
   }
 
   function egg(lc, raw) {