diff --git a/lib/mv_web/live/components/add_filter_builder_component.ex b/lib/mv_web/live/components/add_filter_builder_component.ex
index ccafd01e..fc1ee34b 100644
--- a/lib/mv_web/live/components/add_filter_builder_component.ex
+++ b/lib/mv_web/live/components/add_filter_builder_component.ex
@@ -1190,13 +1190,20 @@ defmodule MvWeb.Components.AddFilterBuilderComponent do
   slot :inner_block, required: true
 
   # Shared two-state join toggle used by the boolean and is/is-not controls
-  # (Task 5): a `join-item` button label wrapping a hidden radio, with a visible
+  # (Task 5): a `join-item` button label wrapping a native radio, with a visible
   # selected state (`btn-primary` when the radio is checked) and an optional
   # leading icon. Consistent look across every two-state selector.
+  #
+  # The radio is `sr-only` (visually hidden) rather than `hidden`/`display:none`
+  # so it stays keyboard-focusable and in the tab order: Tab reaches the group,
+  # native same-`name` radio semantics move the selection with the arrow keys
+  # (WCAG 2.1.1). `has-[:focus-visible]:*` surfaces a visible ring on the styled
+  # label while its input has keyboard focus (WCAG 2.4.7); `z-10` lifts the
+  # focused item so the ring is not clipped by adjacent join-items.
   defp toggle_option(assigns) do
     ~H"""
-    <label class="join-item btn btn-sm gap-1 has-[:checked]:btn-primary">
-      <input type="radio" name={@name} value={@value} class="hidden" checked={@checked} />
+    <label class="join-item btn btn-sm gap-1 has-[:checked]:btn-primary has-[:focus-visible]:z-10 has-[:focus-visible]:ring-2 has-[:focus-visible]:ring-offset-2 has-[:focus-visible]:ring-offset-base-100 has-[:focus-visible]:ring-base-content/60">
+      <input type="radio" name={@name} value={@value} class="sr-only" checked={@checked} />
       <.icon :if={@icon} name={@icon} class="size-3.5" />
       {render_slot(@inner_block)}
     </label>
diff --git a/test/mv_web/member_live/index_add_filter_flow_test.exs b/test/mv_web/member_live/index_add_filter_flow_test.exs
index acee2755..d52bd32c 100644
--- a/test/mv_web/member_live/index_add_filter_flow_test.exs
+++ b/test/mv_web/member_live/index_add_filter_flow_test.exs
@@ -82,6 +82,33 @@ defmodule MvWeb.MemberLive.IndexAddFilterFlowTest do
     refute has_element?(view, "[data-testid='filter-chip']")
   end
 
+  describe "§3.7 join-toggles are keyboard-operable (WCAG 2.1.1 / 2.4.7)" do
+    test "the shared toggle radios are focusable (not display:none) with a visible focus ring",
+         %{conn: conn} do
+      {:ok, view, _html} = live(conn, ~p"/members")
+
+      pick_field(view, "group")
+
+      scope = "[data-testid='value-control-group']"
+
+      assert has_element?(view, "#{scope} input[type='radio']"),
+             "expected the join-toggle to render native radio inputs"
+
+      # A `hidden`/`display:none` (or negative-tabindex) input is skipped by Tab
+      # and cannot be reached with the keyboard — the WCAG 2.1.1 failure.
+      refute has_element?(view, "#{scope} input[type='radio'].hidden"),
+             "toggle radio must not be display:none-hidden (keyboard-unreachable)"
+
+      refute has_element?(view, "#{scope} input[type='radio'][tabindex='-1']"),
+             "toggle radio must stay in the natural tab order (no tabindex=-1)"
+
+      # WCAG 2.4.7: the styled label must surface a visible focus indicator when
+      # its (visually-hidden) input is keyboard-focused.
+      assert render(element(view, scope)) =~ "focus-visible",
+             "toggle label must carry a :focus-visible ring indicator"
+    end
+  end
+
   defp refute_patched(view) do
     assert_raise ArgumentError, fn -> assert_patch(view, 50) end
   end