diff --git a/lib/berrypod_web/live/admin/email_settings.ex b/lib/berrypod_web/live/admin/email_settings.ex
index 236cbe0..9ef0c19 100644
--- a/lib/berrypod_web/live/admin/email_settings.ex
+++ b/lib/berrypod_web/live/admin/email_settings.ex
@@ -221,10 +221,11 @@ defmodule BerrypodWeb.Admin.EmailSettings do
             </fieldset>
           </div>
 
-          <%!-- Steps 2 & 3 for each adapter (CSS :has(:checked) shows the active one) --%>
+          <%!-- Steps 2 & 3: config for each adapter (hidden keeps HTML correct without CSS) --%>
           <.adapter_config
             :for={adapter <- @all_adapters}
             adapter={adapter}
+            selected={@adapter_key == adapter.key}
             values={@all_values[adapter.key] || %{}}
             field_errors={if(@adapter_key == adapter.key, do: @field_errors, else: %{})}
             env_locked={@env_locked}
@@ -346,13 +347,14 @@ defmodule BerrypodWeb.Admin.EmailSettings do
   # ── Local components ──
 
   attr :adapter, :map, required: true
+  attr :selected, :boolean, default: false
   attr :values, :map, required: true
   attr :field_errors, :map, required: true
   attr :env_locked, :boolean, required: true
 
   defp adapter_config(assigns) do
     ~H"""
-    <div class="admin-adapter-config" data-adapter={@adapter.key}>
+    <div hidden={!@selected} class="admin-adapter-config" data-adapter={@adapter.key}>
       <%!-- Create an account (providers with sign-up URLs) --%>
       <div :if={@adapter.url} class="admin-setup-step">
         <div class="admin-setup-step-header">
@@ -433,14 +435,14 @@ defmodule BerrypodWeb.Admin.EmailSettings do
         disabled={@disabled}
         class="card-radio-input"
       />
-      <span class="card-radio-name">
+      <div class="card-radio-name">
         {@adapter.name}
         <span :if={@adapter.recommended} class="card-radio-badge card-radio-recommended">
           Recommended
         </span>
-      </span>
-      <span :if={@adapter.free_tier} class="card-radio-description">{@adapter.free_tier}</span>
-      <span :if={@adapter.setup_hint} class="card-radio-description">{@adapter.setup_hint}</span>
+      </div>
+      <div :if={@adapter.free_tier} class="card-radio-description">{@adapter.free_tier}</div>
+      <div :if={@adapter.setup_hint} class="card-radio-description">{@adapter.setup_hint}</div>
     </label>
     """
   end
diff --git a/test/berrypod_web/live/admin/email_settings_test.exs b/test/berrypod_web/live/admin/email_settings_test.exs
index 2c75c8b..0b3fe29 100644
--- a/test/berrypod_web/live/admin/email_settings_test.exs
+++ b/test/berrypod_web/live/admin/email_settings_test.exs
@@ -251,6 +251,22 @@ defmodule BerrypodWeb.Admin.EmailSettingsTest do
       assert html =~ "Email provider"
       assert html =~ "sr-only"
     end
+
+    test "only selected adapter config is visible (hidden attribute)", %{conn: conn} do
+      {:ok, view, _html} = live(conn, ~p"/admin/settings/email")
+
+      # Select SMTP
+      view
+      |> form("form[phx-change=\"form_change\"]", %{email: %{adapter: "smtp"}})
+      |> render_change()
+
+      # SMTP should not be hidden
+      refute has_element?(view, ~s([data-adapter="smtp"][hidden]))
+      # Others should be hidden
+      assert has_element?(view, ~s([data-adapter="brevo"][hidden]))
+      assert has_element?(view, ~s([data-adapter="sendgrid"][hidden]))
+      assert has_element?(view, ~s([data-adapter="postal"][hidden]))
+    end
   end
 
   describe "unauthenticated" do