diff --git a/lib/bds/desktop/shell_live/post_editor.ex b/lib/bds/desktop/shell_live/post_editor.ex
index a3c31ae..ddba32c 100644
--- a/lib/bds/desktop/shell_live/post_editor.ex
+++ b/lib/bds/desktop/shell_live/post_editor.ex
@@ -140,9 +140,20 @@ defmodule BDS.Desktop.ShellLive.PostEditor do
 
   def set_mode(socket, post_id, mode, reload) do
     workbench = socket.assigns.workbench
+    normalized_mode = normalize_mode(mode)
+
+    if normalized_mode == :preview do
+      case Repo.get(Post, post_id) do
+        %Post{} = post ->
+          _ = Preview.ensure_preview(post.project_id)
+
+        _other ->
+          :ok
+      end
+    end
 
     socket
-    |> assign(:post_editor_modes, Map.put(socket.assigns.post_editor_modes, post_id, normalize_mode(mode)))
+    |> assign(:post_editor_modes, Map.put(socket.assigns.post_editor_modes, post_id, normalized_mode))
     |> reload.(workbench)
   end
 
@@ -870,18 +881,13 @@ defmodule BDS.Desktop.ShellLive.PostEditor do
   defp preview_url(_post, _active_language, _canonical_language, mode) when mode != :preview, do: nil
 
   defp preview_url(%Post{} = post, active_language, canonical_language, :preview) do
-    with {:ok, server} <- Preview.start_preview(post.project_id) do
-      base_url = "http://#{server.host}:#{server.port}"
-      query =
-        %{}
-        |> maybe_put_query("draft", "true")
-        |> maybe_put_query("post_id", post.id)
-        |> maybe_put_query("lang", active_language != canonical_language && active_language)
+    query =
+      %{}
+      |> maybe_put_query("draft", "true")
+      |> maybe_put_query("post_id", post.id)
+      |> maybe_put_query("lang", active_language != canonical_language && active_language)
 
-      base_url <> canonical_preview_path(post.created_at, post.slug) <> "?" <> URI.encode_query(query)
-    else
-      _other -> nil
-    end
+    Preview.base_url() <> canonical_preview_path(post.created_at, post.slug) <> "?" <> URI.encode_query(query)
   end
 
   defp canonical_preview_path(created_at_ms, slug) do
diff --git a/lib/bds/preview.ex b/lib/bds/preview.ex
index 51a24fe..d050e6d 100644
--- a/lib/bds/preview.ex
+++ b/lib/bds/preview.ex
@@ -5,6 +5,7 @@ defmodule BDS.Preview do
 
   alias BDS.Posts
   alias BDS.Posts.Translation
+  alias BDS.PreviewAssets
   alias BDS.Projects
   alias BDS.Repo
   alias BDS.Rendering
@@ -25,6 +26,17 @@ defmodule BDS.Preview do
     )
   end
 
+  def ensure_preview(project_id) when is_binary(project_id) do
+    project = Projects.get_project!(project_id)
+
+    GenServer.call(
+      __MODULE__,
+      {:ensure_preview, project_id, Projects.project_data_dir(project), self()}
+    )
+  end
+
+  def base_url, do: "http://#{@host}:#{@port}"
+
   def stop_preview(project_id) when is_binary(project_id) do
     GenServer.call(__MODULE__, {:stop_preview, project_id})
   end
@@ -48,31 +60,17 @@ defmodule BDS.Preview do
 
   @impl true
   def handle_call({:start_preview, project_id, data_dir, owner_pid}, _from, state) do
-    state = stop_current_server(state)
-    maybe_allow_repo(owner_pid)
+    {reply, next_state} = start_server(state, project_id, data_dir, owner_pid)
+    {:reply, reply, next_state}
+  end
 
-    {:ok, listener} =
-      :gen_tcp.listen(@port, [
-        :binary,
-        packet: :raw,
-        active: false,
-        reuseaddr: true,
-        ip: {127, 0, 0, 1}
-      ])
+  def handle_call({:ensure_preview, project_id, _data_dir, _owner_pid}, _from, %{current: %{project_id: project_id, is_running: true}} = state) do
+    {:reply, {:ok, public_server(state.current)}, state}
+  end
 
-    acceptor_pid = spawn_link(fn -> accept_loop(listener, project_id) end)
-
-    server = %{
-      project_id: project_id,
-      data_dir: data_dir,
-      host: @host,
-      port: @port,
-      is_running: true,
-      listener: listener,
-      acceptor_pid: acceptor_pid
-    }
-
-    {:reply, {:ok, public_server(server)}, %{state | current: server}}
+  def handle_call({:ensure_preview, project_id, data_dir, owner_pid}, _from, state) do
+    {reply, next_state} = start_server(state, project_id, data_dir, owner_pid)
+    {:reply, reply, next_state}
   end
 
   def handle_call({:stop_preview, project_id}, _from, state) do
@@ -141,24 +139,30 @@ defmodule BDS.Preview do
   defp ensure_running(_server, _project_id), do: {:error, :not_running}
 
   defp resolve_request(server, request_path, query_params) do
-    with {:ok, relative_path, kind} <- route_request(request_path) do
-      full_path =
-        case kind do
-          :media -> safe_join(server.data_dir, Path.join(["media", relative_path]))
-          :generated -> safe_join(Path.join(server.data_dir, "html"), relative_path)
-        end
+    case PreviewAssets.response(request_path) do
+      {:ok, response} ->
+        {:ok, response}
 
-      case full_path do
-        {:error, :not_found} ->
-          {:error, :not_found}
+      :error ->
+        with {:ok, relative_path, kind} <- route_request(request_path) do
+          full_path =
+            case kind do
+              :media -> safe_join(server.data_dir, Path.join(["media", relative_path]))
+              :generated -> safe_join(Path.join(server.data_dir, "html"), relative_path)
+            end
 
-        resolved_path ->
-          case read_response(resolved_path) do
-            {:error, :not_found} -> render_not_found_response(server.project_id, query_params)
-            {:ok, response} -> {:ok, apply_response_overrides(response, query_params)}
-            other -> other
+          case full_path do
+            {:error, :not_found} ->
+              {:error, :not_found}
+
+            resolved_path ->
+              case read_response(resolved_path) do
+                {:error, :not_found} -> render_not_found_response(server.project_id, query_params)
+                {:ok, response} -> {:ok, apply_response_overrides(response, query_params)}
+                other -> other
+              end
           end
-      end
+        end
     end
   end
 
@@ -197,8 +201,8 @@ defmodule BDS.Preview do
         %{
           id: translation.id,
           title: translation.title,
-          content: translation.content || "",
-          body: translation.content || "",
+          content: Posts.editor_body(translation),
+          body: Posts.editor_body(translation),
           slug: post.slug,
           language: translation.language,
           excerpt: translation.excerpt,
@@ -209,8 +213,8 @@ defmodule BDS.Preview do
         %{
           id: post.id,
           title: post.title,
-          content: post.content || "",
-          body: post.content || "",
+          content: Posts.editor_body(post),
+          body: Posts.editor_body(post),
           slug: post.slug,
           language: post.language,
           excerpt: post.excerpt,
@@ -385,6 +389,34 @@ defmodule BDS.Preview do
 
   defp stop_current_server(state), do: state
 
+  defp start_server(state, project_id, data_dir, owner_pid) do
+    state = stop_current_server(state)
+    maybe_allow_repo(owner_pid)
+
+    {:ok, listener} =
+      :gen_tcp.listen(@port, [
+        :binary,
+        packet: :raw,
+        active: false,
+        reuseaddr: true,
+        ip: {127, 0, 0, 1}
+      ])
+
+    acceptor_pid = spawn_link(fn -> accept_loop(listener, project_id) end)
+
+    server = %{
+      project_id: project_id,
+      data_dir: data_dir,
+      host: @host,
+      port: @port,
+      is_running: true,
+      listener: listener,
+      acceptor_pid: acceptor_pid
+    }
+
+    {{:ok, public_server(server)}, %{state | current: server}}
+  end
+
   defp public_server(server) do
     Map.take(server, [:project_id, :host, :port, :is_running])
   end
@@ -435,10 +467,23 @@ defmodule BDS.Preview do
 
   defp apply_preview_overrides(body, query_params) when is_binary(body) and is_map(query_params) do
     body
+    |> override_pico_stylesheet_href(normalize_override(query_params["theme"]))
     |> override_html_attribute("data-theme", normalize_override(query_params["theme"]))
     |> override_html_attribute("data-mode", normalize_override(query_params["mode"]))
   end
 
+  defp override_pico_stylesheet_href(body, nil), do: body
+
+  defp override_pico_stylesheet_href(body, theme) do
+    replacement =
+      case theme do
+        "default" -> "/assets/pico.min.css"
+        value -> "/assets/pico.#{value}.min.css"
+      end
+
+    Regex.replace(~r{/assets/pico(?:\.[a-z]+)?\.min\.css}, body, replacement, global: false)
+  end
+
   defp normalize_override(nil), do: nil
   defp normalize_override(""), do: nil
   defp normalize_override(value), do: String.trim(value)
diff --git a/lib/bds/preview_assets.ex b/lib/bds/preview_assets.ex
new file mode 100644
index 0000000..d1db31a
--- /dev/null
+++ b/lib/bds/preview_assets.ex
@@ -0,0 +1,335 @@
+defmodule BDS.PreviewAssets do
+  @moduledoc false
+
+  @theme_tokens %{
+    "amber" => %{light_primary: "#876400", dark_primary: "#c79400"},
+    "blue" => %{light_primary: "#2060df", dark_primary: "#8999f9"},
+    "cyan" => %{light_primary: "#047878", dark_primary: "#0ab1b1"},
+    "fuchsia" => %{light_primary: "#c1208b", dark_primary: "#f869bf"},
+    "green" => %{light_primary: "#33790f", dark_primary: "#4eb31b"},
+    "grey" => %{light_primary: "#6a6a6a", dark_primary: "#9e9e9e"},
+    "indigo" => %{light_primary: "#655cd6", dark_primary: "#a294e5"},
+    "jade" => %{light_primary: "#007a50", dark_primary: "#00b478"},
+    "lime" => %{light_primary: "#577400", dark_primary: "#82ab00"},
+    "orange" => %{light_primary: "#bd3c13", dark_primary: "#f56b3d"},
+    "pink" => %{light_primary: "#c72259", dark_primary: "#f7708e"},
+    "pumpkin" => %{light_primary: "#9c5900", dark_primary: "#e48500"},
+    "purple" => %{light_primary: "#aa40bf", dark_primary: "#d47de4"},
+    "red" => %{light_primary: "#c52f21", dark_primary: "#f17961"},
+    "sand" => %{light_primary: "#6e6a60", dark_primary: "#a39e8f"},
+    "slate" => %{light_primary: "#5d6b89", dark_primary: "#909ebe"},
+    "violet" => %{light_primary: "#8352c5", dark_primary: "#b290d9"},
+    "yellow" => %{light_primary: "#756b00", dark_primary: "#ad9f00"},
+    "zinc" => %{light_primary: "#646b79", dark_primary: "#969eaf"}
+  }
+
+  @highlight_stylesheet """
+  .hljs { color: #e6edf3; background: transparent; display: block; overflow-x: auto; }
+  .hljs-keyword, .hljs-selector-tag, .hljs-literal { color: #ff7b72; }
+  .hljs-string, .hljs-attr { color: #a5d6ff; }
+  .hljs-number, .hljs-title, .hljs-section { color: #f2cc60; }
+  .hljs-comment, .hljs-quote { color: #8b949e; }
+  .hljs-built_in, .hljs-type, .hljs-symbol { color: #7ee787; }
+  """
+
+  @highlight_script "window.hljs = window.hljs || { highlightElement: function () {} };"
+
+  @lightbox_script "window.lightbox = window.lightbox || { option: function () {}, init: function () {} };"
+
+  @calendar_stylesheet """
+  [data-blog-calendar-root] { min-height: 12rem; }
+  [data-blog-calendar-root] button { font: inherit; }
+  """
+
+  @calendar_script """
+  (function () {
+    function Calendar() {}
+    Calendar.prototype.init = function () {};
+    window.VanillaCalendar = window.VanillaCalendar || Calendar;
+    window.VanillaCalendarPro = window.VanillaCalendarPro || Calendar;
+  })();
+  """
+
+  @calendar_runtime """
+  (function () {
+    function toggle(panel, hidden) {
+      if (!panel) {
+        return;
+      }
+
+      if (hidden) {
+        panel.setAttribute('hidden', 'hidden');
+      } else {
+        panel.removeAttribute('hidden');
+      }
+    }
+
+    function init() {
+      var toggleButton = document.querySelector('[data-blog-calendar-toggle]');
+      var closeButton = document.querySelector('[data-blog-calendar-close]');
+      var panel = document.querySelector('[data-blog-calendar-panel]');
+      var status = document.querySelector('[data-blog-calendar-status]');
+
+      if (!toggleButton || !panel) {
+        return;
+      }
+
+      toggleButton.addEventListener('click', function () {
+        var isHidden = panel.hasAttribute('hidden');
+        toggle(panel, !isHidden);
+        if (status && !status.dataset.previewReady) {
+          status.textContent = 'Preview calendar is unavailable in draft mode.';
+          status.dataset.previewReady = 'true';
+        }
+      });
+
+      if (closeButton) {
+        closeButton.addEventListener('click', function () {
+          toggle(panel, true);
+        });
+      }
+    }
+
+    if (document.readyState === 'loading') {
+      document.addEventListener('DOMContentLoaded', init, { once: true });
+    } else {
+      init();
+    }
+  })();
+  """
+
+  @search_runtime """
+  (function () {
+    function setHidden(panel, hidden) {
+      if (!panel) {
+        return;
+      }
+
+      if (hidden) {
+        panel.setAttribute('hidden', 'hidden');
+      } else {
+        panel.removeAttribute('hidden');
+      }
+    }
+
+    function init() {
+      var toggle = document.querySelector('[data-blog-search-toggle]');
+      var panel = document.querySelector('[data-blog-search-panel]');
+      if (!toggle || !panel) {
+        return;
+      }
+
+      toggle.addEventListener('click', function () {
+        setHidden(panel, !panel.hasAttribute('hidden'));
+      });
+
+      document.addEventListener('click', function (event) {
+        if (panel.hasAttribute('hidden')) {
+          return;
+        }
+
+        if (panel.contains(event.target) || toggle.contains(event.target)) {
+          return;
+        }
+
+        setHidden(panel, true);
+      });
+    }
+
+    if (document.readyState === 'loading') {
+      document.addEventListener('DOMContentLoaded', init, { once: true });
+    } else {
+      init();
+    }
+  })();
+  """
+
+  @tag_cloud_runtime """
+  (function () {
+    function init() {}
+    if (document.readyState === 'loading') {
+      document.addEventListener('DOMContentLoaded', init, { once: true });
+    } else {
+      init();
+    }
+  })();
+  """
+
+  @d3_cloud_script """
+  (function () {
+    var layout = {
+      size: function () { return layout; },
+      words: function () { return layout; },
+      padding: function () { return layout; },
+      rotate: function () { return layout; },
+      font: function () { return layout; },
+      fontSize: function () { return layout; },
+      on: function () { return layout; },
+      start: function () { return layout; }
+    };
+
+    window.d3 = window.d3 || {};
+    window.d3.layout = window.d3.layout || {};
+    window.d3.layout.cloud = function () { return layout; };
+  })();
+  """
+
+  def response(pathname) when is_binary(pathname) do
+    case Regex.run(~r{^/assets/([^/]+)$}, pathname) do
+      [_, asset_name] -> build_asset_response(asset_name)
+      _other -> :error
+    end
+  end
+
+  defp build_asset_response(asset_name) do
+    case asset_payload(asset_name) do
+      {:ok, content_type, body} -> {:ok, %{content_type: content_type, body: body}}
+      :error -> :error
+    end
+  end
+
+  defp asset_payload(asset_name) do
+    case Regex.run(~r/^pico(?:\.([a-z]+))?\.min\.css$/, asset_name) do
+      [_, theme] -> {:ok, "text/css", pico_stylesheet(theme)}
+      [single] when single == asset_name -> {:ok, "text/css", pico_stylesheet(nil)}
+      _other -> named_asset_payload(asset_name)
+    end
+  end
+
+  defp named_asset_payload("bds.css"), do: file_asset("bds.css", "text/css")
+  defp named_asset_payload("code-enhancements.js"), do: file_asset("code-enhancements.js", "application/javascript")
+  defp named_asset_payload("highlight.min.css"), do: {:ok, "text/css", @highlight_stylesheet}
+  defp named_asset_payload("highlight.min.js"), do: {:ok, "application/javascript", @highlight_script}
+  defp named_asset_payload("lightbox.min.css"), do: {:ok, "text/css", ""}
+  defp named_asset_payload("lightbox.min.js"), do: {:ok, "application/javascript", @lightbox_script}
+  defp named_asset_payload("vanilla-calendar.min.css"), do: {:ok, "text/css", @calendar_stylesheet}
+  defp named_asset_payload("vanilla-calendar.min.js"), do: {:ok, "application/javascript", @calendar_script}
+  defp named_asset_payload("calendar-runtime.js"), do: {:ok, "application/javascript", @calendar_runtime}
+  defp named_asset_payload("search-runtime.js"), do: {:ok, "application/javascript", @search_runtime}
+  defp named_asset_payload("tag-cloud.js"), do: {:ok, "application/javascript", @tag_cloud_runtime}
+  defp named_asset_payload("d3.layout.cloud.js"), do: {:ok, "application/javascript", @d3_cloud_script}
+  defp named_asset_payload(_asset_name), do: :error
+
+  defp file_asset(filename, content_type) do
+    case File.read(asset_path(filename)) do
+      {:ok, body} -> {:ok, content_type, body}
+      {:error, _reason} -> :error
+    end
+  end
+
+  defp asset_path(filename) do
+    Application.app_dir(:bds, "priv/preview_assets/#{filename}")
+  end
+
+  defp pico_stylesheet(theme) do
+    tokens = Map.get(@theme_tokens, theme || "", %{light_primary: "#2060df", dark_primary: "#8999f9"})
+
+    """
+    :root {
+      color-scheme: light dark;
+      --pico-font-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", sans-serif;
+      --pico-line-height: 1.6;
+      --pico-border-radius: 0.35rem;
+      --pico-background-color: #ffffff;
+      --pico-color: #1f2937;
+      --pico-muted-color: #5d6b89;
+      --pico-muted-border-color: #d6dde8;
+      --pico-card-background-color: #f7f9fc;
+      --pico-primary: #{tokens.light_primary};
+      --pico-primary-hover: #{tokens.light_primary};
+      --pico-primary-focus: rgba(32, 96, 223, 0.16);
+      --pico-primary-inverse: #ffffff;
+      --pico-code-background-color: #1f2937;
+      --pico-code-color: #e6edf3;
+      --pico-ins-color: #2f7a38;
+      --pico-del-color: #b74848;
+      --pico-form-element-background-color: #ffffff;
+      --pico-form-element-border-color: #c7d0dd;
+      --pico-form-element-color: #1f2937;
+    }
+
+    :root[data-mode='light'] {
+      color-scheme: light;
+    }
+
+    :root[data-mode='dark'] {
+      color-scheme: dark;
+      --pico-background-color: #13171f;
+      --pico-color: #e6edf3;
+      --pico-muted-color: #909ebe;
+      --pico-muted-border-color: #2d3645;
+      --pico-card-background-color: #1b2230;
+      --pico-primary: #{tokens.dark_primary};
+      --pico-primary-hover: #{tokens.dark_primary};
+      --pico-primary-focus: rgba(137, 153, 249, 0.18);
+      --pico-code-background-color: #0f1520;
+      --pico-form-element-background-color: #13171f;
+      --pico-form-element-border-color: #364153;
+      --pico-form-element-color: #e6edf3;
+    }
+
+    @media only screen and (prefers-color-scheme: dark) {
+      :root:not([data-mode='light']) {
+        color-scheme: dark;
+        --pico-background-color: #13171f;
+        --pico-color: #e6edf3;
+        --pico-muted-color: #909ebe;
+        --pico-muted-border-color: #2d3645;
+        --pico-card-background-color: #1b2230;
+        --pico-primary: #{tokens.dark_primary};
+        --pico-primary-hover: #{tokens.dark_primary};
+        --pico-primary-focus: rgba(137, 153, 249, 0.18);
+        --pico-code-background-color: #0f1520;
+        --pico-form-element-background-color: #13171f;
+        --pico-form-element-border-color: #364153;
+        --pico-form-element-color: #e6edf3;
+      }
+    }
+
+    * { box-sizing: border-box; }
+    html { font-family: var(--pico-font-family); background: var(--pico-background-color); color: var(--pico-color); }
+    body { margin: 0; font-family: inherit; background: var(--pico-background-color); color: var(--pico-color); line-height: var(--pico-line-height); }
+    h1, h2, h3, h4, h5, h6 { color: inherit; line-height: 1.2; margin: 0 0 0.75rem; }
+    p, ul, ol, pre, table, blockquote { margin: 0 0 1rem; }
+    a { color: var(--pico-primary); }
+    a:hover, a:focus-visible { color: var(--pico-primary-hover); }
+    button, [role='button'], input, textarea, select {
+      font: inherit;
+    }
+    button, [role='button'] {
+      display: inline-flex;
+      align-items: center;
+      justify-content: center;
+      gap: 0.35rem;
+      border: 1px solid var(--pico-form-element-border-color);
+      border-radius: var(--pico-border-radius);
+      background: var(--pico-card-background-color);
+      color: var(--pico-color);
+      padding: 0.45rem 0.8rem;
+      cursor: pointer;
+      text-decoration: none;
+    }
+    input, textarea, select {
+      width: 100%;
+      border: 1px solid var(--pico-form-element-border-color);
+      border-radius: var(--pico-border-radius);
+      padding: 0.55rem 0.7rem;
+      background: var(--pico-form-element-background-color);
+      color: var(--pico-form-element-color);
+    }
+    code, pre, kbd {
+      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
+    }
+    img { max-width: 100%; height: auto; }
+    hr { border: 0; border-top: 1px solid var(--pico-muted-border-color); }
+    table { width: 100%; border-collapse: collapse; }
+    th, td { padding: 0.45rem 0.6rem; border-bottom: 1px solid var(--pico-muted-border-color); text-align: left; }
+    blockquote {
+      margin-left: 0;
+      padding-left: 1rem;
+      border-left: 4px solid var(--pico-muted-border-color);
+      color: var(--pico-muted-color);
+    }
+    """
+  end
+end
diff --git a/lib/bds/rendering.ex b/lib/bds/rendering.ex
index 7edd7bc..77d448f 100644
--- a/lib/bds/rendering.ex
+++ b/lib/bds/rendering.ex
@@ -172,8 +172,18 @@ defmodule BDS.Rendering do
           :page_title,
           Map.get(assigns, "page_title", Map.get(assigns, :title, Map.get(assigns, "title")))
         ),
-      pico_stylesheet_href: default_pico_stylesheet_href(),
-      html_theme_attribute: html_theme_attribute(metadata.pico_theme),
+      pico_stylesheet_href:
+        Map.get(
+          assigns,
+          :pico_stylesheet_href,
+          Map.get(assigns, "pico_stylesheet_href", default_pico_stylesheet_href(metadata.pico_theme))
+        ),
+      html_theme_attribute:
+        Map.get(
+          assigns,
+          :html_theme_attribute,
+          Map.get(assigns, "html_theme_attribute", html_theme_attribute(metadata.pico_theme))
+        ),
       blog_languages: blog_languages(metadata, language),
       alternate_links: alternate_links(canonical_post, project_id, main_language),
       menu_items: menu_items(project_id),
@@ -220,8 +230,18 @@ defmodule BDS.Rendering do
         ),
       page_title: Map.get(assigns, :page_title, Map.get(assigns, "page_title")),
       posts: posts,
-      pico_stylesheet_href: default_pico_stylesheet_href(),
-      html_theme_attribute: html_theme_attribute(metadata.pico_theme),
+      pico_stylesheet_href:
+        Map.get(
+          assigns,
+          :pico_stylesheet_href,
+          Map.get(assigns, "pico_stylesheet_href", default_pico_stylesheet_href(metadata.pico_theme))
+        ),
+      html_theme_attribute:
+        Map.get(
+          assigns,
+          :html_theme_attribute,
+          Map.get(assigns, "html_theme_attribute", html_theme_attribute(metadata.pico_theme))
+        ),
       blog_languages: blog_languages(metadata, language),
       alternate_links: [],
       menu_items: menu_items(project_id),
@@ -267,8 +287,18 @@ defmodule BDS.Rendering do
           :language_prefix,
           Map.get(assigns, "language_prefix", language_prefix(language, main_language))
         ),
-      pico_stylesheet_href: default_pico_stylesheet_href(),
-      html_theme_attribute: html_theme_attribute(metadata.pico_theme),
+      pico_stylesheet_href:
+        Map.get(
+          assigns,
+          :pico_stylesheet_href,
+          Map.get(assigns, "pico_stylesheet_href", default_pico_stylesheet_href(metadata.pico_theme))
+        ),
+      html_theme_attribute:
+        Map.get(
+          assigns,
+          :html_theme_attribute,
+          Map.get(assigns, "html_theme_attribute", html_theme_attribute(metadata.pico_theme))
+        ),
       blog_languages: blog_languages(metadata, language),
       menu_items: menu_items(project_id),
       alternate_links: [],
@@ -695,9 +725,13 @@ defmodule BDS.Rendering do
 
   defp html_theme_attribute(nil), do: nil
   defp html_theme_attribute(""), do: nil
+  defp html_theme_attribute("default"), do: nil
   defp html_theme_attribute(theme), do: ~s(data-theme="#{theme}")
 
-  defp default_pico_stylesheet_href, do: "/assets/pico.min.css"
+  defp default_pico_stylesheet_href(nil), do: "/assets/pico.min.css"
+  defp default_pico_stylesheet_href(""), do: "/assets/pico.min.css"
+  defp default_pico_stylesheet_href("default"), do: "/assets/pico.min.css"
+  defp default_pico_stylesheet_href(theme), do: "/assets/pico.#{theme}.min.css"
 
   defp href_for_language(""), do: "/"
   defp href_for_language(prefix), do: prefix <> "/"
diff --git a/priv/preview_assets/bds.css b/priv/preview_assets/bds.css
new file mode 100644
index 0000000..6e1ef60
--- /dev/null
+++ b/priv/preview_assets/bds.css
@@ -0,0 +1,169 @@
+:root { color-scheme: light dark; }
+@media only screen and (prefers-color-scheme: dark) {
+  :root:not([data-theme]) { --pico-background-color: #13171f; }
+}
+[data-theme='dark'] { --pico-background-color: #13171f; }
+body { max-width: 960px; margin: 0 auto; padding: 2rem 1rem 4rem; background: var(--pico-background-color, var(--background-color)); color: var(--pico-color, var(--color)); }
+main { display: grid; gap: 1rem; }
+.blog-menu { position: relative; display: flex; align-items: baseline; justify-content: space-between; gap: .75rem; border-top: 1px solid var(--pico-muted-border-color, var(--muted-border-color)); border-bottom: 1px solid var(--pico-muted-border-color, var(--muted-border-color)); padding: .4rem 0; margin: -.15rem 0 .2rem; }
+.blog-menu > .blog-menu-list { width: 100%; }
+.blog-menu-list { list-style: none; display: flex; flex-wrap: wrap; align-items: baseline; gap: .25rem .75rem; margin: 0; padding: 0; }
+.blog-menu-item { position: relative; }
+.blog-menu-link { display: inline-flex; align-items: center; color: var(--pico-muted-color, var(--muted-color)); text-decoration: none; font-size: .94rem; line-height: 1.4; padding: .2rem .1rem; }
+.blog-menu-item-with-children > .blog-menu-link::after { content: '▾'; font-size: .7em; margin-left: .38rem; opacity: .72; }
+.blog-menu-link:hover,
+.blog-menu-link:focus-visible { color: var(--pico-color, var(--color)); text-decoration: underline; }
+.blog-menu-submenu { position: absolute; top: calc(100% + .12rem); left: 0; min-width: 12rem; display: none; border: 1px solid var(--pico-muted-border-color, var(--muted-border-color)); background: var(--pico-card-background-color, var(--card-background-color)); padding: .3rem 0; z-index: 10; }
+.blog-menu-submenu .blog-menu-list { flex-direction: column; flex-wrap: nowrap; gap: 0; margin: 0; }
+.blog-menu-submenu .blog-menu-item { display: block; padding: 0; margin: 0; }
+.blog-menu-submenu .blog-menu-link { display: block; padding: .22rem .75rem; font-size: .88rem; line-height: 1.3; }
+.blog-menu-submenu .blog-menu-item a.blog-menu-link { margin: 0; }
+.blog-menu-item-with-children:hover > .blog-menu-submenu,
+.blog-menu-item-with-children:focus-within > .blog-menu-submenu { display: block; }
+.blog-menu-calendar { position: relative; display: inline-flex; align-items: baseline; justify-content: center; margin-left: auto; align-self: baseline; flex-shrink: 0; }
+.blog-menu-calendar-button { display: inline-flex; align-items: center; justify-content: center; width: auto; height: auto; margin: 0; padding: .2rem .1rem; border: 0; background: transparent; color: var(--pico-muted-color, var(--muted-color)); border-radius: 0; cursor: pointer; font: inherit; font-size: .94rem; line-height: 1.4; appearance: none; -webkit-appearance: none; vertical-align: baseline; }
+.blog-menu-calendar-button svg { display: block; width: .9rem; height: .9rem; fill: none; stroke: currentColor; transform: translateY(2px); }
+.blog-menu-calendar-button:hover,
+.blog-menu-calendar-button:focus-visible { color: var(--pico-color, var(--color)); }
+.blog-calendar-panel { position: absolute; top: calc(100% + .15rem); right: 0; width: min(17.5rem, 92vw); border: 1px solid var(--pico-muted-border-color, var(--muted-border-color)); background: var(--pico-card-background-color, var(--card-background-color)); padding: .32rem; z-index: 30; }
+.blog-calendar-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: .1rem; }
+.blog-calendar-header strong { font-size: .9rem; line-height: 1.2; }
+.blog-calendar-close { border: 1px solid var(--pico-muted-border-color, var(--muted-border-color)); background: transparent; color: var(--pico-muted-color, var(--muted-color)); width: 1.35rem; height: 1.35rem; border-radius: .2rem; padding: 0; cursor: pointer; line-height: 1; }
+.blog-calendar-close:hover,
+.blog-calendar-close:focus-visible { color: var(--pico-color, var(--color)); border-color: var(--pico-color, var(--color)); }
+.blog-calendar-content { display: grid; gap: .08rem; }
+.blog-calendar-status { margin: .1rem 0 0; color: var(--pico-muted-color, var(--muted-color)); font-size: .74rem; }
+[data-blog-calendar-root] { font-size: .86rem; }
+[data-blog-calendar-root] [data-vc=header] { margin-bottom: .08rem; }
+[data-blog-calendar-root] [data-vc=month],
+[data-blog-calendar-root] [data-vc=year] { padding: .08rem .18rem; font-size: .9rem; line-height: 1.15; }
+[data-blog-calendar-root] [data-vc=months],
+[data-blog-calendar-root] [data-vc=years] { row-gap: .32rem; }
+[data-blog-calendar-root] [data-vc=years] { grid-template-columns: repeat(4, minmax(0, 1fr)); }
+[data-blog-calendar-root] [data-vc-months-month],
+[data-blog-calendar-root] [data-vc-years-year] { height: 1.72rem; }
+[data-blog-calendar-root] [data-vc-months-month],
+[data-blog-calendar-root] [data-vc-years-year] { word-break: normal; white-space: nowrap; }
+[data-blog-calendar-root] [data-vc-years-year] { min-width: 2.5rem; font-size: .7rem; line-height: 1; }
+[data-blog-calendar-root] [data-vc-week=days] { margin-bottom: .08rem; }
+[data-blog-calendar-root] [data-vc-week-day] { font-size: .68rem; line-height: .9rem; min-width: 1.45rem; }
+[data-blog-calendar-root] [data-vc-date] { padding-top: 0; padding-bottom: 0; }
+[data-blog-calendar-root] [data-vc-date-btn] { min-height: 1.45rem; min-width: 1.45rem; font-size: .68rem; line-height: .9rem; }
+[data-blog-calendar-has-posts='true'] [data-vc-date-btn] {
+  border-color: hsl(var(--blog-calendar-heat-hue, 210) 85% 42% / .95);
+  background-color: hsl(var(--blog-calendar-heat-hue, 210) 88% 52% / var(--blog-calendar-heat-alpha, 0));
+}
+[data-blog-calendar-root] [data-vc-months-month][data-blog-calendar-has-posts='true'],
+[data-blog-calendar-root] [data-vc-years-year][data-blog-calendar-has-posts='true'] {
+  background-color: hsl(var(--blog-calendar-heat-hue, 210) 88% 52% / var(--blog-calendar-heat-alpha, 0));
+  border-color: hsl(var(--blog-calendar-heat-hue, 210) 85% 42% / .95);
+}
+.post { border: 1px solid var(--pico-muted-border-color, var(--muted-border-color)); padding: 1rem; background: var(--pico-card-background-color, var(--card-background-color)); min-width: 0; }
+.post pre { position: relative; overflow-x: auto; max-width: 100%; border: 1px solid var(--pico-muted-border-color, var(--muted-border-color)); border-radius: .3rem; margin: .9rem 0; padding: .85rem .9rem; background: var(--pico-code-background-color, rgba(33, 38, 45, .82)); box-sizing: border-box; }
+.post pre code { display: block; font-size: .88rem; line-height: 1.5; white-space: pre; }
+.code-copy-button {
+  position: absolute;
+  top: .4rem;
+  right: .4rem;
+  border: 1px solid var(--pico-muted-border-color, var(--muted-border-color));
+  background: var(--pico-card-background-color, var(--card-background-color));
+  color: var(--pico-muted-color, var(--muted-color));
+  border-radius: .25rem;
+  width: 1.8rem;
+  height: 1.8rem;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  padding: 0;
+  cursor: pointer;
+  opacity: .88;
+}
+.code-copy-button:hover,
+.code-copy-button:focus-visible { opacity: 1; color: var(--pico-color, var(--color)); }
+.code-copy-icon { font-size: .95rem; line-height: 1; }
+.code-copy-success .code-copy-button { color: var(--pico-ins-color, rgb(53, 117, 56)); border-color: var(--pico-ins-color, rgb(53, 117, 56)); }
+.code-copy-failed .code-copy-button { color: var(--pico-del-color, rgb(183, 72, 72)); border-color: var(--pico-del-color, rgb(183, 72, 72)); }
+.post iframe { width: 100%; min-height: 20rem; }
+.macro-youtube, .macro-vimeo { margin-bottom: 1rem; }
+.macro-gallery, .macro-photo-archive, .macro-tag-cloud { border: 1px dashed var(--pico-muted-border-color, var(--muted-border-color)); padding: .75rem; margin: 1rem 0; }
+.gallery-container { display: grid; gap: .5rem; }
+.macro-gallery.gallery-cols-1 .gallery-container { grid-template-columns: 1fr; }
+.macro-gallery.gallery-cols-2 .gallery-container { grid-template-columns: repeat(2, minmax(0, 1fr)); }
+.macro-gallery.gallery-cols-3 .gallery-container { grid-template-columns: repeat(3, minmax(0, 1fr)); }
+.macro-gallery.gallery-cols-4 .gallery-container { grid-template-columns: repeat(4, minmax(0, 1fr)); }
+.macro-gallery.gallery-cols-5 .gallery-container { grid-template-columns: repeat(5, minmax(0, 1fr)); }
+.macro-gallery.gallery-cols-6 .gallery-container { grid-template-columns: repeat(6, minmax(0, 1fr)); }
+.gallery-item, .photo-archive-item { display: block; overflow: hidden; border-radius: .25rem; }
+.gallery-item img, .photo-archive-item img { display: block; width: 100%; height: auto; aspect-ratio: 1 / 1; object-fit: cover; }
+.lb-nav a, .lb-nav a:hover, .lb-nav a:focus-visible { border: 0; box-shadow: none; outline: none; text-decoration: none; }
+.gallery-caption { margin-top: .5rem; text-align: center; color: var(--pico-muted-color, var(--muted-color)); font-size: .92rem; }
+.gallery-empty, .photo-archive-empty { color: var(--pico-muted-color, var(--muted-color)); font-style: italic; }
+.photo-archive-container { display: grid; gap: 1rem; }
+.photo-archive-month { display: grid; grid-template-columns: 3.25rem 1fr; gap: .75rem; align-items: start; }
+.photo-archive-month-label { display: flex; justify-content: center; align-items: center; }
+.photo-archive-month-label span { writing-mode: vertical-rl; transform: rotate(180deg); letter-spacing: .08em; text-transform: uppercase; color: var(--pico-muted-color, var(--muted-color)); }
+.photo-archive-gallery { display: grid; gap: .5rem; grid-template-columns: repeat(4, minmax(0, 1fr)); }
+.photo-archive-single-month .photo-archive-gallery { grid-template-columns: repeat(5, minmax(0, 1fr)); }
+.macro-tag-cloud { min-height: 14rem; }
+.tag-cloud-canvas { display: block; width: 100%; height: auto; min-height: 12rem; }
+.tag-cloud-empty { color: var(--pico-muted-color, var(--muted-color)); font-style: italic; }
+.archive-day-group { display: grid; grid-template-columns: 5.25rem 1fr; gap: 1.25rem; align-items: stretch; }
+.archive-day-marker { display: flex; justify-content: center; align-items: center; color: var(--pico-muted-color, var(--muted-color)); }
+.archive-day-marker span { writing-mode: vertical-rl; transform: rotate(180deg); letter-spacing: .16em; font-size: 1.05rem; font-weight: 600; text-transform: uppercase; }
+.archive-day-posts { display: grid; gap: 1rem; }
+.archive-day-separator { position: relative; height: 2px; width: 100%; color: var(--pico-color, var(--color)); border-top: 1px solid currentColor; opacity: .18; margin: .45rem 0 .65rem; }
+.archive-day-separator::before { content: ''; position: absolute; inset: 0; background: linear-gradient(to right, transparent 0%, transparent 18%, currentColor 58%, transparent 92%, transparent 100%); opacity: .85; }
+.single-post { margin: 0; padding: 0; background: transparent; border: 0; box-shadow: none; }
+.single-post-taxonomy { display: flex; flex-wrap: wrap; gap: .4rem .45rem; margin: -.1rem 0 .2rem; }
+.single-post-taxonomy-bubble {
+  --bubble-accent: var(--pico-ins-color, rgb(53, 117, 56));
+  --bubble-bg: var(--bubble-accent);
+  display: inline-flex;
+  align-items: center;
+  border: 1px solid var(--bubble-accent);
+  border-radius: 999px;
+  padding: .1rem .5rem;
+  font-size: .74rem;
+  line-height: 1.35;
+  color: #000;
+  background: var(--bubble-bg, var(--bubble-accent));
+  text-decoration: none;
+}
+.single-post-taxonomy-bubble:hover,
+.single-post-taxonomy-bubble:focus-visible { text-decoration: underline; }
+.single-post-taxonomy-bubble-category { --bubble-accent: var(--pico-ins-color, rgb(53, 117, 56)); --bubble-bg: var(--pico-ins-color, rgb(53, 117, 56)); }
+.single-post-taxonomy-bubble-tag { --bubble-accent: var(--pico-del-color, rgb(183, 72, 72)); --bubble-bg: var(--pico-del-color, rgb(183, 72, 72)); }
+.single-post-backlinks { display: flex; flex-wrap: wrap; gap: .4rem .45rem; align-items: center; margin-top: 1.5rem; }
+.single-post-backlinks-label { font-size: .74rem; line-height: 1.35; color: var(--pico-muted-color, var(--muted-color)); margin-right: .15rem; }
+.single-post-backlink-bubble { --bubble-accent: var(--pico-primary, rgb(16, 107, 193)); --bubble-bg: var(--pico-primary, rgb(16, 107, 193)); color: var(--pico-primary-inverse, #fff); }
+.preview-pagination { display: flex; justify-content: space-between; align-items: center; gap: .75rem; margin-top: .25rem; }
+.preview-pagination-link { color: var(--pico-muted-color, var(--muted-color)); text-decoration: none; font-size: .92rem; opacity: .72; transition: opacity .15s ease-in-out; }
+.preview-pagination-link:hover,
+.preview-pagination-link:focus-visible { opacity: 1; text-decoration: underline; }
+.preview-pagination .spacer { flex: 1; }
+.not-found { display: grid; place-items: center; min-height: 48vh; }
+.not-found article { max-width: 32rem; text-align: center; }
+.language-switcher { position: fixed; right: .75rem; top: 1.5rem; display: flex; flex-direction: column; gap: .1rem; z-index: 100; }
+.language-switcher-badge { display: block; padding: .05rem .1rem; font-size: .85rem; line-height: 1.1; text-decoration: none; border: 1px solid transparent; border-radius: .15rem; cursor: pointer; opacity: .7; transition: opacity .15s ease-in-out; }
+.language-switcher-badge:hover,
+.language-switcher-badge:focus-visible { opacity: 1; border-color: var(--pico-color, var(--color)); }
+.language-switcher-badge-current { opacity: 1; border-color: var(--pico-primary, var(--primary)); }
+.blog-search-widget, .blog-search-standalone { position: relative; margin-top: .15rem; }
+.blog-search-standalone { position: fixed; right: .75rem; top: 1.5rem; z-index: 100; }
+.blog-search-toggle { display: inline-flex; align-items: center; justify-content: center; border: 0; background: transparent; color: var(--pico-muted-color, var(--muted-color)); cursor: pointer; padding: .15rem; opacity: .7; transition: opacity .15s ease-in-out; }
+.blog-search-toggle:hover, .blog-search-toggle:focus-visible { opacity: 1; color: var(--pico-color, var(--color)); }
+.blog-search-toggle svg { display: block; }
+.blog-search-panel { position: absolute; top: calc(100% + .25rem); right: 0; width: min(24rem, 90vw); z-index: 40; border: 1px solid var(--pico-muted-border-color, var(--muted-border-color)); background: var(--pico-card-background-color, var(--card-background-color)); padding: .5rem; border-radius: .35rem; box-shadow: 0 4px 24px rgba(0,0,0,.25); }
+.blog-search-panel .pagefind-ui { --pagefind-ui-scale: .8; --pagefind-ui-primary: var(--pico-primary, var(--primary)); --pagefind-ui-text: var(--pico-color, var(--color)); --pagefind-ui-background: var(--pico-card-background-color, var(--card-background-color)); --pagefind-ui-border: var(--pico-muted-border-color, var(--muted-border-color)); --pagefind-ui-tag: var(--pico-muted-border-color, var(--muted-border-color)); --pagefind-ui-border-width: 1px; --pagefind-ui-border-radius: .2rem; --pagefind-ui-image-border-radius: .2rem; --pagefind-ui-image-box-ratio: 0; --pagefind-ui-font: inherit; font-size: .85rem; }
+.blog-search-panel .pagefind-ui__search-input { font-size: .85rem; padding: .3rem .5rem; border: 1px solid var(--pico-muted-border-color, var(--muted-border-color)); background: var(--pico-background-color, var(--background-color)); color: var(--pico-color, var(--color)); border-radius: .2rem; width: 100%; }
+.blog-search-panel .pagefind-ui__search-clear { color: var(--pico-muted-color, var(--muted-color)); background: none; font-size: .8rem; }
+.blog-search-panel .pagefind-ui__search-clear:focus { outline-color: var(--pico-primary, var(--primary)); }
+.blog-search-panel .pagefind-ui__drawer { max-height: min(60vh, 28rem); overflow-y: auto; }
+.blog-search-panel .pagefind-ui__message { color: var(--pico-muted-color, var(--muted-color)); font-size: .78rem; padding: .25rem 0; }
+.blog-search-panel .pagefind-ui__result { border-top: 1px solid var(--pico-muted-border-color, var(--muted-border-color)); padding: .4rem 0; }
+.blog-search-panel .pagefind-ui__result-link { color: var(--pico-primary, var(--primary)); font-size: .85rem; }
+.blog-search-panel .pagefind-ui__result-title { font-size: .85rem; }
+.blog-search-panel .pagefind-ui__result-excerpt { font-size: .78rem; color: var(--pico-muted-color, var(--muted-color)); }
+.blog-search-panel .pagefind-ui__result-excerpt mark { background-color: var(--pico-primary-focus, rgba(255,223,0,.35)); color: inherit; }
+.blog-search-panel .pagefind-ui__button { color: var(--pico-primary, var(--primary)); background: none; border: 1px solid var(--pico-muted-border-color, var(--muted-border-color)); border-radius: .2rem; font-size: .78rem; cursor: pointer; }
+.blog-search-panel .pagefind-ui__button:hover { border-color: var(--pico-primary, var(--primary)); }
\ No newline at end of file
diff --git a/priv/preview_assets/code-enhancements.js b/priv/preview_assets/code-enhancements.js
new file mode 100644
index 0000000..b60cd10
--- /dev/null
+++ b/priv/preview_assets/code-enhancements.js
@@ -0,0 +1,136 @@
+(function () {
+  function resolveCodeLanguage(codeElement) {
+    if (!codeElement) {
+      return '';
+    }
+
+    var direct = codeElement.getAttribute('data-code-language');
+    if (typeof direct === 'string' && direct.trim()) {
+      return direct.trim().toLowerCase();
+    }
+
+    var className = codeElement.className || '';
+    var classMatch = className.match(/(?:^|\s)language-([\w.+-]+)/i);
+    if (classMatch && classMatch[1]) {
+      return classMatch[1].toLowerCase();
+    }
+
+    return '';
+  }
+
+  function fallbackCopy(value) {
+    var textarea = document.createElement('textarea');
+    textarea.value = value;
+    textarea.setAttribute('readonly', 'readonly');
+    textarea.style.position = 'fixed';
+    textarea.style.opacity = '0';
+    textarea.style.pointerEvents = 'none';
+    document.body.appendChild(textarea);
+    textarea.focus();
+    textarea.select();
+
+    try {
+      return document.execCommand('copy');
+    } catch (_) {
+      return false;
+    } finally {
+      document.body.removeChild(textarea);
+    }
+  }
+
+  async function copyCodeToClipboard(value) {
+    if (navigator.clipboard && typeof navigator.clipboard.writeText === 'function') {
+      try {
+        await navigator.clipboard.writeText(value);
+        return true;
+      } catch (_) {
+        return fallbackCopy(value);
+      }
+    }
+
+    return fallbackCopy(value);
+  }
+
+  function ensureCopyButton(preElement, codeElement) {
+    if (!preElement || preElement.querySelector(':scope > .code-copy-button')) {
+      return;
+    }
+
+    preElement.classList.add('code-block-enhanced');
+
+    var button = document.createElement('button');
+    button.type = 'button';
+    button.className = 'code-copy-button';
+    button.setAttribute('aria-hidden', 'true');
+
+    var icon = document.createElement('span');
+    icon.className = 'code-copy-icon';
+    icon.textContent = '⧉';
+    button.appendChild(icon);
+
+    button.addEventListener('click', async function () {
+      var codeText = codeElement.textContent || '';
+      var copied = await copyCodeToClipboard(codeText);
+      preElement.classList.remove('code-copy-failed');
+      preElement.classList.remove('code-copy-success');
+      preElement.classList.add(copied ? 'code-copy-success' : 'code-copy-failed');
+
+      if (copied) {
+        icon.textContent = '✓';
+        window.setTimeout(function () {
+          preElement.classList.remove('code-copy-success');
+          icon.textContent = '⧉';
+        }, 1200);
+        return;
+      }
+
+      window.setTimeout(function () {
+        preElement.classList.remove('code-copy-failed');
+      }, 1200);
+    });
+
+    preElement.appendChild(button);
+  }
+
+  function highlightCodeBlock(codeElement) {
+    var highlighter = window.hljs;
+    if (!highlighter || typeof highlighter.highlightElement !== 'function') {
+      return;
+    }
+
+    if (codeElement.getAttribute('data-code-highlighted') === 'true') {
+      return;
+    }
+
+    try {
+      highlighter.highlightElement(codeElement);
+      codeElement.setAttribute('data-code-highlighted', 'true');
+    } catch (_) {
+    }
+  }
+
+  function initCodeBlocks() {
+    var codeNodes = document.querySelectorAll('pre > code');
+    codeNodes.forEach(function (codeElement) {
+      var preElement = codeElement.parentElement;
+      if (!preElement || preElement.tagName !== 'PRE') {
+        return;
+      }
+
+      var language = resolveCodeLanguage(codeElement);
+      if (language) {
+        codeElement.setAttribute('data-code-language', language);
+        preElement.setAttribute('data-code-language', language);
+      }
+
+      ensureCopyButton(preElement, codeElement);
+      highlightCodeBlock(codeElement);
+    });
+  }
+
+  if (document.readyState === 'loading') {
+    document.addEventListener('DOMContentLoaded', initCodeBlocks, { once: true });
+  } else {
+    initCodeBlocks();
+  }
+})();
\ No newline at end of file
diff --git a/test/bds/preview_test.exs b/test/bds/preview_test.exs
index 9ad72ae..cf4ff77 100644
--- a/test/bds/preview_test.exs
+++ b/test/bds/preview_test.exs
@@ -78,6 +78,16 @@ defmodule BDS.PreviewTest do
     assert {:ok, %{body: "console.log('pagefind')", content_type: "application/javascript"}} =
              BDS.Preview.request(project.id, "/pagefind/pagefind-ui.js")
 
+    assert {:ok, %{body: pico_css, content_type: "text/css"}} =
+         BDS.Preview.request(project.id, "/assets/pico.min.css")
+
+    assert pico_css =~ ":root"
+
+    assert {:ok, %{body: bds_css, content_type: "text/css"}} =
+         BDS.Preview.request(project.id, "/assets/bds.css")
+
+    assert bds_css =~ ".blog-menu"
+
     assert {:ok, %{body: "media body", content_type: "text/plain"}} =
              BDS.Preview.request(project.id, "/media/2026/04/image.txt")
 
@@ -85,6 +95,7 @@ defmodule BDS.PreviewTest do
              BDS.Preview.preview_draft(project.id, "/draft/draft-post", post.id)
 
     assert draft_html =~ "Draft preview body"
+    assert draft_html =~ ~s(href="/assets/pico.min.css")
     assert {:error, :not_found} = BDS.Preview.request(project.id, "/media/../../secret.txt")
 
     assert :ok = BDS.Preview.stop_preview(project.id)
@@ -202,6 +213,40 @@ defmodule BDS.PreviewTest do
     assert :ok = BDS.Preview.stop_preview(project.id)
   end
 
+  test "http draft preview serves published post body from the file-backed canonical route", %{
+    project: project
+  } do
+    :inets.start()
+
+    assert {:ok, post} =
+             Posts.create_post(%{
+               project_id: project.id,
+               title: "Published HTTP Preview",
+               content: "Published body from file",
+               language: "en"
+             })
+
+    assert {:ok, _published} = Posts.publish_post(post.id)
+    assert {:ok, server} = BDS.Preview.start_preview(project.id)
+
+    datetime = DateTime.from_unix!(post.created_at, :millisecond)
+
+    request_url =
+      "http://#{server.host}:#{server.port}/#{datetime.year}/#{String.pad_leading(Integer.to_string(datetime.month), 2, "0")}/#{String.pad_leading(Integer.to_string(datetime.day), 2, "0")}/#{post.slug}?draft=true&post_id=#{post.id}"
+
+    assert {:ok, {{_version, 200, _reason}, _headers, body}} =
+             :httpc.request(
+               :get,
+               {to_charlist(request_url), []},
+               [],
+               body_format: :binary
+             )
+
+    assert body =~ "Published body from file"
+
+    assert :ok = BDS.Preview.stop_preview(project.id)
+  end
+
   test "preview renders not-found template for missing routes and rewrites markdown macros and canonical URLs",
        %{project: project, temp_dir: temp_dir} do
     :inets.start()
@@ -362,12 +407,14 @@ defmodule BDS.PreviewTest do
 
     assert generated_html =~ ~s(data-theme="amber")
     assert generated_html =~ ~s(data-mode="dark")
+    assert generated_html =~ ~s(/assets/pico.amber.min.css)
 
     assert {:ok, %{body: draft_html, content_type: "text/html"}} =
              BDS.Preview.preview_draft(project.id, "/draft/theme-draft?theme=amber&mode=dark", post.id)
 
     assert draft_html =~ ~s(data-theme="amber")
     assert draft_html =~ ~s(data-mode="dark")
+    assert draft_html =~ ~s(/assets/pico.amber.min.css)
 
     assert :ok = BDS.Preview.stop_preview(project.id)
   end