diff --git a/src/client/ClanModal.ts b/src/client/ClanModal.ts
index d5c2c468e..e4b1b0886 100644
--- a/src/client/ClanModal.ts
+++ b/src/client/ClanModal.ts
@@ -16,6 +16,7 @@ import "./components/clan/ClanTransferView";
 import "./components/ConfirmDialog";
 import "./components/CopyButton";
 import { modalHeader } from "./components/ui/ModalHeader";
+import { modalRouter } from "./ModalRouter";
 import { translateText } from "./Utils";
 
 type View =
@@ -153,6 +154,7 @@ export class ClanModal extends BaseModal {
         this.selectedClanTag = "";
         this.myRole = null;
         this.detailCache = null;
+        modalRouter.syncArgs("clan", { clan: null });
       },
       ariaLabel,
       rightContent: clan ? this.tagPill(clan.tag) : undefined,
@@ -399,6 +401,7 @@ export class ClanModal extends BaseModal {
   private openDetail(tag: string) {
     this.selectedClanTag = tag;
     this.view = "detail";
+    modalRouter.syncArgs("clan", { clan: tag });
   }
 
   private renderMyClans() {
diff --git a/src/client/ModalRouter.ts b/src/client/ModalRouter.ts
index a2224f86e..377827db2 100644
--- a/src/client/ModalRouter.ts
+++ b/src/client/ModalRouter.ts
@@ -123,6 +123,24 @@ class ModalRouter {
     this.replaceHash("#" + params.toString());
   }
 
+  /** Called when a router-managed modal changes non-tab route state. */
+  syncArgs(name: string, args: Record<string, unknown>): void {
+    if (this.routingFromUrl) return;
+    if (this.currentName !== name) return;
+    const params = this.currentHashParams();
+    params.set("modal", name);
+    for (const [key, value] of Object.entries(args)) {
+      if (key === "modal") continue;
+      if (value === undefined || value === null || value === "") {
+        params.delete(key);
+        continue;
+      }
+      if (typeof value === "object") continue;
+      params.set(key, String(value));
+    }
+    this.replaceHash("#" + params.toString());
+  }
+
   /** True if the current hash is `#modal=...`. */
   isHashRouted(): boolean {
     const hash = window.location.hash;