diff --git a/bincio/serve/server.py b/bincio/serve/server.py
index e5a3812..d9a8e7d 100644
--- a/bincio/serve/server.py
+++ b/bincio/serve/server.py
@@ -2750,7 +2750,7 @@ async def list_ideas(
         idea["vote_count"] = len(votes)
         idea["my_vote"] = user.handle in votes
         ideas.append(idea)
-    ideas.sort(key=lambda x: (-x["vote_count"], -x["created_at"]))
+    ideas.sort(key=lambda x: (x.get("status") == "done", -x["vote_count"], -x["created_at"]))
     return JSONResponse({"ideas": ideas})
 
 
@@ -2806,6 +2806,28 @@ async def toggle_idea_vote(
     return JSONResponse({"voted": voted, "votes": len(votes)})
 
 
+@app.post("/api/ideas/{idea_id}/status")
+async def toggle_idea_status(
+    idea_id: str,
+    bincio_session: Optional[str] = Cookie(default=None),
+) -> JSONResponse:
+    user = _require_user(bincio_session)
+    if not user.is_admin:
+        raise HTTPException(403, "Forbidden")
+    dd = _get_data_dir()
+    path = _ideas_dir(dd) / f"{idea_id}.json"
+    if not path.exists():
+        raise HTTPException(404, "Not found")
+    with open(path, "r+", encoding="utf-8") as f:
+        _fcntl.flock(f, _fcntl.LOCK_EX)
+        idea = json.load(f)
+        idea["status"] = "open" if idea.get("status") == "done" else "done"
+        f.seek(0)
+        f.truncate()
+        json.dump(idea, f, ensure_ascii=False, indent=2)
+    return JSONResponse({"status": idea["status"]})
+
+
 @app.delete("/api/ideas/{idea_id}")
 async def delete_idea(
     idea_id: str,
diff --git a/site/src/components/IdeasPage.svelte b/site/src/components/IdeasPage.svelte
index c0f95d7..9807638 100644
--- a/site/src/components/IdeasPage.svelte
+++ b/site/src/components/IdeasPage.svelte
@@ -10,6 +10,7 @@
     votes: string[];
     vote_count: number;
     my_vote: boolean;
+    status?: string;
   }
 
   let ideas: Idea[] = [];
@@ -108,6 +109,22 @@
     }
   }
 
+  async function toggleStatus(idea: Idea) {
+    const r = await fetch(`/api/ideas/${idea.id}/status`, {
+      method: 'POST',
+      credentials: 'include',
+    });
+    if (r.ok) {
+      const d = await r.json();
+      idea.status = d.status;
+      ideas = [...ideas].sort((a, b) =>
+        (a.status === 'done' ? 1 : 0) - (b.status === 'done' ? 1 : 0) ||
+        b.vote_count - a.vote_count ||
+        b.created_at - a.created_at
+      );
+    }
+  }
+
   async function deleteIdea(idea: Idea) {
     if (!confirm(`Delete "${idea.title}"?`)) return;
     const r = await fetch(`/api/ideas/${idea.id}`, {
@@ -170,7 +187,11 @@
   {:else}
     <ul class="space-y-3">
       {#each ideas as idea (idea.id)}
-        <li class="rounded-xl border px-4 py-3 flex gap-3" style="background: var(--bg-card); border-color: var(--border)">
+        {@const done = idea.status === 'done'}
+        <li
+          class="rounded-xl border px-4 py-3 flex gap-3 transition-opacity"
+          style="background: var(--bg-card); border-color: var(--border); opacity: {done ? '0.55' : '1'}"
+        >
           <!-- Vote button -->
           <div class="flex flex-col items-center shrink-0 pt-0.5">
             <button
@@ -189,15 +210,27 @@
           <!-- Content -->
           <div class="flex-1 min-w-0">
             <div class="flex items-start justify-between gap-2">
-              <p class="font-medium text-sm" style="color: var(--text-primary)">{idea.title}</p>
-              {#if isAdmin || idea.author === myHandle}
-                <button
-                  on:click={() => deleteIdea(idea)}
-                  class="shrink-0 text-xs px-1.5 py-0.5 rounded transition-colors hover:text-red-400"
-                  style="color: var(--text-5)"
-                  title="Delete"
-                >×</button>
-              {/if}
+              <p class="font-medium text-sm" style="color: var(--text-primary)">
+                {#if done}<span class="mr-1.5 text-green-500">✓</span>{/if}{idea.title}
+              </p>
+              <div class="flex items-center gap-1 shrink-0">
+                {#if isAdmin}
+                  <button
+                    on:click={() => toggleStatus(idea)}
+                    class="text-xs px-1.5 py-0.5 rounded transition-colors"
+                    style="color: {done ? 'var(--text-5)' : 'var(--accent)'}; border: 1px solid {done ? 'var(--border-sub)' : 'var(--accent)'}"
+                    title={done ? 'Mark as open' : 'Mark as done'}
+                  >{done ? 'reopen' : 'done'}</button>
+                {/if}
+                {#if isAdmin || idea.author === myHandle}
+                  <button
+                    on:click={() => deleteIdea(idea)}
+                    class="text-xs px-1.5 py-0.5 rounded transition-colors hover:text-red-400"
+                    style="color: var(--text-5)"
+                    title="Delete"
+                  >×</button>
+                {/if}
+              </div>
             </div>
             {#if idea.body}
               <p class="text-xs mt-1" style="color: var(--text-4)">{idea.body}</p>