diff --git a/ventures/havre/index.html b/ventures/havre/index.html
index 1d4b656..4cfbee9 100644
--- a/ventures/havre/index.html
+++ b/ventures/havre/index.html
@@ -24,6 +24,7 @@
 <link rel="stylesheet" href="style.css">
 <script type="module" src="app.js"></script>
 <script src="update.js" defer></script>
+<script src="split.js" defer></script>
 </head>
 <body>
 <a class="skip" href="#chat">skip to the chat</a>
diff --git a/ventures/havre/split.js b/ventures/havre/split.js
new file mode 100644
index 0000000..7762609
--- /dev/null
+++ b/ventures/havre/split.js
@@ -0,0 +1,54 @@
+// split.js: on a wide screen, the line between the list (chats / characters / harbor) and the chat can be dragged, or
+// moved with the arrow keys once focused. Double-click (or Home) puts it back. The width is kept in this browser.
+// Below 1040px the two take turns on screen, so there is nothing to drag and the divider hides (style.css).
+(() => {
+  const KEY = "havre.split", MIN = 320, CHAT_MIN = 380;
+  const get = () => { try { return JSON.parse(localStorage.getItem(KEY)); } catch { return null; } };
+  const put = (v) => { try { v == null ? localStorage.removeItem(KEY) : localStorage.setItem(KEY, JSON.stringify(v)); } catch { /* not kept */ } };
+  function start() {
+    const studio = document.getElementById("studio"), chars = document.getElementById("chars"), chat = document.getElementById("chat");
+    if (!studio || !chars || !chat) return;
+    const bar = document.createElement("div");
+    bar.className = "splitter";
+    bar.tabIndex = 0;
+    bar.setAttribute("role", "separator");
+    bar.setAttribute("aria-orientation", "vertical");
+    bar.setAttribute("aria-controls", "chars");
+    bar.setAttribute("aria-label", "Resize the list and the chat");
+    bar.title = "drag to resize · double-click to reset";
+    chat.before(bar);
+    const wide = () => window.matchMedia("(min-width: 1041px)").matches;
+    const clamp = (w) => Math.round(Math.max(MIN, Math.min(w, studio.clientWidth - CHAT_MIN - bar.offsetWidth)));
+    function set(w, keep = true) {
+      if (w == null || !wide()) { chars.style.flex = ""; bar.removeAttribute("aria-valuenow"); if (w == null && keep) put(null); return; }
+      w = clamp(w);
+      chars.style.flex = `0 0 ${w}px`;
+      bar.setAttribute("aria-valuenow", String(w));
+      if (keep) put(w);
+    }
+    set(get(), false);
+    window.addEventListener("resize", () => set(get(), false));
+    bar.addEventListener("pointerdown", (e) => {
+      if (!wide() || e.button !== 0) return;
+      e.preventDefault();
+      bar.setPointerCapture(e.pointerId);
+      const left = chars.getBoundingClientRect().left;
+      document.body.classList.add("splitting");
+      const move = (ev) => set(ev.clientX - left);
+      const up = () => { bar.removeEventListener("pointermove", move); bar.removeEventListener("pointerup", up); bar.removeEventListener("pointercancel", up); document.body.classList.remove("splitting"); };
+      bar.addEventListener("pointermove", move);
+      bar.addEventListener("pointerup", up);
+      bar.addEventListener("pointercancel", up);
+    });
+    bar.addEventListener("dblclick", () => set(null));
+    bar.addEventListener("keydown", (e) => {
+      const now = chars.getBoundingClientRect().width, step = e.shiftKey ? 80 : 20;
+      if (e.key === "ArrowLeft") set(now - step);
+      else if (e.key === "ArrowRight") set(now + step);
+      else if (e.key === "Home") set(null);
+      else return;
+      e.preventDefault();
+    });
+  }
+  if (document.readyState === "loading") document.addEventListener("DOMContentLoaded", start); else start();
+})();
diff --git a/ventures/havre/style.css b/ventures/havre/style.css
index e9f033d..b39c110 100644
--- a/ventures/havre/style.css
+++ b/ventures/havre/style.css
@@ -144,6 +144,10 @@ input:disabled, textarea:disabled, select:disabled { background: var(--well); co
 /* ---------- the studio: characters | chat ---------- */
 .studio { display: flex; flex-wrap: wrap; align-items: flex-start; border-bottom: 2px solid var(--ink); }
 .chars { flex: 1.15 1 560px; min-width: 0; align-self: stretch; border-right: 1px solid var(--ink); }
+/* the line between the list and the chat, to drag (split.js) */
+.splitter { flex: 0 0 7px; align-self: stretch; margin-left: -4px; margin-right: -3px; position: relative; z-index: 2; cursor: col-resize; touch-action: none; }
+.splitter:hover, .splitter:focus-visible, .splitting .splitter { background: var(--hi); outline: none; }
+body.splitting { cursor: col-resize; user-select: none; }
 .chat {
   flex: 1 1 440px; min-width: 0; display: flex; flex-direction: column;
   position: sticky; top: 0; max-height: 100vh;
@@ -504,6 +508,7 @@ p.note { padding: 8px 10px; border: 1px solid var(--ink); background: var(--hi);
 
 /* ---------- narrow screens ---------- */
 @media (max-width: 1040px) {
+  .splitter { display: none; }
   .chars { border-right: 0; border-bottom: 1px solid var(--ink); }
   /* one at a time, like a phone's messages: the list, or the chat. In the chat the left column's tabs stay above it,
      without their panels, so CHATS / CHARACTERS / HARBOR are always one tap away */
diff --git a/ventures/havre/update.js b/ventures/havre/update.js
index 5309d00..92ac252 100644
--- a/ventures/havre/update.js
+++ b/ventures/havre/update.js
@@ -4,7 +4,7 @@
 // Checking fetches with cache: "reload", which also refreshes the browser's copies, so the reload gets the new files.
 (() => {
   const FILES = ["./", "app.js", "style.css", "workflows.js", "abilities.js", "card.js", "venice.js", "memory.js",
-    "threads.js", "media.js", "backup.js", "theme.js"];
+    "threads.js", "media.js", "backup.js", "theme.js", "split.js"];
   let base = null, shown = false, busy = false;
   async function print() {
     const parts = await Promise.all(FILES.map((f) => fetch(f, { cache: "reload" }).then((r) => (r.ok ? r.text() : "")).catch(() => null)));