diff --git a/account/bp/fragments/routes.py b/account/bp/fragments/routes.py
index b21a601..6574e8f 100644
--- a/account/bp/fragments/routes.py
+++ b/account/bp/fragments/routes.py
@@ -9,7 +9,7 @@ Fragments:
 
 from __future__ import annotations
 
-from quart import Blueprint, Response, request, render_template
+from quart import Blueprint, Response, request
 
 from shared.infrastructure.fragments import FRAGMENT_HEADER
 
@@ -22,10 +22,13 @@ def register():
     # ---------------------------------------------------------------
 
     async def _auth_menu():
+        from shared.infrastructure.urls import account_url
+        from shared.sexp.jinja_bridge import sexp as render_sexp
+
         user_email = request.args.get("email", "")
-        return await render_template(
-            "fragments/auth_menu.html",
-            user_email=user_email,
+        return render_sexp(
+            '(~auth-menu :user-email user-email :account-url account-url)',
+            **{"user-email": user_email or None, "account-url": account_url("")},
         )
 
     _handlers = {
diff --git a/cart/bp/fragments/routes.py b/cart/bp/fragments/routes.py
index c60cc52..bdeab0b 100644
--- a/cart/bp/fragments/routes.py
+++ b/cart/bp/fragments/routes.py
@@ -10,7 +10,7 @@ Fragments:
 
 from __future__ import annotations
 
-from quart import Blueprint, Response, request, render_template, g
+from quart import Blueprint, Response, request, g
 
 from shared.infrastructure.fragments import FRAGMENT_HEADER
 
@@ -24,6 +24,8 @@ def register():
 
     async def _cart_mini():
         from shared.services.registry import services
+        from shared.infrastructure.urls import blog_url, cart_url
+        from shared.sexp.jinja_bridge import sexp as render_sexp
 
         user_id = request.args.get("user_id", type=int)
         session_id = request.args.get("session_id")
@@ -33,17 +35,18 @@ def register():
         )
         count = summary.count + summary.calendar_count + summary.ticket_count
         oob = request.args.get("oob", "")
-        return await render_template("fragments/cart_mini.html", cart_count=count, oob=oob)
+        return render_sexp(
+            '(~cart-mini :cart-count cart-count :blog-url blog-url :cart-url cart-url :oob oob)',
+            **{"cart-count": count, "blog-url": blog_url(""), "cart-url": cart_url(""), "oob": oob or None},
+        )
 
     async def _account_nav_item():
         from shared.infrastructure.urls import cart_url
+        from shared.sexp.jinja_bridge import sexp as render_sexp
 
-        href = cart_url("/orders/")
-        return (
-            '<div class="relative nav-group">'
-            f'<a href="{href}" class="justify-center cursor-pointer flex flex-row '
-            'items-center gap-2 rounded bg-stone-200 text-black p-3" data-hx-disable>'
-            'orders</a></div>'
+        return render_sexp(
+            '(~account-nav-item :href href :label "orders")',
+            href=cart_url("/orders/"),
         )
 
     _handlers = {
diff --git a/events/bp/fragments/routes.py b/events/bp/fragments/routes.py
index 9f67b05..3f8e7a3 100644
--- a/events/bp/fragments/routes.py
+++ b/events/bp/fragments/routes.py
@@ -35,6 +35,10 @@ def register():
     # --- container-nav fragment: calendar entries + calendar links -----------
 
     async def _container_nav_handler():
+        from quart import current_app
+        from shared.infrastructure.urls import events_url
+        from shared.sexp.jinja_bridge import sexp as render_sexp
+
         container_type = request.args.get("container_type", "page")
         container_id = int(request.args.get("container_id", 0))
         post_slug = request.args.get("post_slug", "")
@@ -43,6 +47,8 @@ def register():
         exclude = request.args.get("exclude", "")
         excludes = [e.strip() for e in exclude.split(",") if e.strip()]
 
+        styles = current_app.jinja_env.globals.get("styles", {})
+        nav_class = styles.get("nav_button_less_pad", "")
         html_parts = []
 
         # Calendar entries nav
@@ -50,23 +56,41 @@ def register():
             entries, has_more = await services.calendar.associated_entries(
                 g.s, container_type, container_id, page,
             )
-            if entries:
-                html_parts.append(await render_template(
-                    "fragments/container_nav_entries.html",
-                    entries=entries, has_more=has_more,
-                    page=page, post_slug=post_slug,
-                    paginate_url_base=paginate_url_base,
+            for entry in entries:
+                entry_path = (
+                    f"/{post_slug}/calendars/{entry.calendar_slug}/"
+                    f"{entry.start_at.year}/{entry.start_at.month}/"
+                    f"{entry.start_at.day}/entries/{entry.id}/"
+                )
+                date_str = entry.start_at.strftime("%b %d, %Y at %H:%M")
+                if entry.end_at:
+                    date_str += f" – {entry.end_at.strftime('%H:%M')}"
+                html_parts.append(render_sexp(
+                    '(~calendar-entry-nav :href href :name name :date-str date-str :nav-class nav-class)',
+                    href=events_url(entry_path), name=entry.name,
+                    **{"date-str": date_str, "nav-class": nav_class},
                 ))
+            # Infinite scroll sentinel (kept as raw HTML — HTMX-specific)
+            if has_more and paginate_url_base:
+                html_parts.append(
+                    f'<div id="entries-load-sentinel-{page}"'
+                    f' hx-get="{paginate_url_base}?page={page + 1}"'
+                    f' hx-trigger="intersect once"'
+                    f' hx-swap="beforebegin"'
+                    f' _="on htmx:afterRequest trigger scroll on #associated-entries-container"'
+                    f' class="flex-shrink-0 w-1"></div>'
+                )
 
         # Calendar links nav
         if not any(e.startswith("calendar") for e in excludes):
             calendars = await services.calendar.calendars_for_container(
                 g.s, container_type, container_id,
             )
-            if calendars:
-                html_parts.append(await render_template(
-                    "fragments/container_nav_calendars.html",
-                    calendars=calendars, post_slug=post_slug,
+            for cal in calendars:
+                href = events_url(f"/{post_slug}/calendars/{cal.slug}/")
+                html_parts.append(render_sexp(
+                    '(~calendar-link-nav :href href :name name :nav-class nav-class)',
+                    href=href, name=cal.name, **{"nav-class": nav_class},
                 ))
 
         return "\n".join(html_parts)
@@ -99,7 +123,28 @@ def register():
     # --- account-nav-item fragment: tickets + bookings links for account nav -
 
     async def _account_nav_item_handler():
-        return await render_template("fragments/account_nav_items.html")
+        from quart import current_app
+        from shared.infrastructure.urls import account_url
+
+        styles = current_app.jinja_env.globals.get("styles", {})
+        nav_class = styles.get("nav_button", "")
+        hx_select = (
+            "#main-panel, #search-mobile, #search-count-mobile,"
+            " #search-desktop, #search-count-desktop, #menu-items-nav-wrapper"
+        )
+        tickets_url = account_url("/tickets/")
+        bookings_url = account_url("/bookings/")
+        # These two links use HTMX navigation — kept as raw HTML for the
+        # hx-* attributes that don't map neatly to a reusable component.
+        parts = []
+        for href, label in [(tickets_url, "tickets"), (bookings_url, "bookings")]:
+            parts.append(
+                f'<div class="relative nav-group">'
+                f'<a href="{href}" hx-get="{href}" hx-target="#main-panel"'
+                f' hx-select="{hx_select}" hx-swap="outerHTML"'
+                f' hx-push-url="true" class="{nav_class}">{label}</a></div>'
+            )
+        return "\n".join(parts)
 
     _handlers["account-nav-item"] = _account_nav_item_handler
 
diff --git a/market/bp/fragments/routes.py b/market/bp/fragments/routes.py
index 91d5668..358253a 100644
--- a/market/bp/fragments/routes.py
+++ b/market/bp/fragments/routes.py
@@ -33,6 +33,10 @@ def register():
     # --- container-nav fragment: market links --------------------------------
 
     async def _container_nav_handler():
+        from quart import current_app
+        from shared.infrastructure.urls import market_url
+        from shared.sexp.jinja_bridge import sexp as render_sexp
+
         container_type = request.args.get("container_type", "page")
         container_id = int(request.args.get("container_id", 0))
         post_slug = request.args.get("post_slug", "")
@@ -42,10 +46,16 @@ def register():
         )
         if not markets:
             return ""
-        return await render_template(
-            "fragments/container_nav_markets.html",
-            markets=markets, post_slug=post_slug,
-        )
+        styles = current_app.jinja_env.globals.get("styles", {})
+        nav_class = styles.get("nav_button_less_pad", "")
+        parts = []
+        for m in markets:
+            href = market_url(f"/{post_slug}/{m.slug}/")
+            parts.append(render_sexp(
+                '(~market-link-nav :href href :name name :nav-class nav-class)',
+                href=href, name=m.name, **{"nav-class": nav_class},
+            ))
+        return "\n".join(parts)
 
     _handlers["container-nav"] = _container_nav_handler
 
diff --git a/orders/bp/fragments/routes.py b/orders/bp/fragments/routes.py
index b4cbbc4..15bbbd5 100644
--- a/orders/bp/fragments/routes.py
+++ b/orders/bp/fragments/routes.py
@@ -14,12 +14,11 @@ def register():
 
     async def _account_nav_item():
         from shared.infrastructure.urls import orders_url
-        href = orders_url("/")
-        return (
-            '<div class="relative nav-group">'
-            f'<a href="{href}" class="justify-center cursor-pointer flex flex-row '
-            'items-center gap-2 rounded bg-stone-200 text-black p-3" data-hx-disable>'
-            'orders</a></div>'
+        from shared.sexp.jinja_bridge import sexp as render_sexp
+
+        return render_sexp(
+            '(~account-nav-item :href href :label "orders")',
+            href=orders_url("/"),
         )
 
     _handlers = {
diff --git a/shared/browser/app/errors.py b/shared/browser/app/errors.py
index ce638fc..9d3b0c6 100644
--- a/shared/browser/app/errors.py
+++ b/shared/browser/app/errors.py
@@ -57,6 +57,18 @@ def _error_page(message: str) -> str:
     )
 
 
+def _sexp_error_page(errnum: str, message: str, image: str | None = None) -> str:
+    """Render an error page via s-expressions. Bypasses Jinja entirely."""
+    from shared.sexp.page import render_page
+
+    return render_page(
+        '(~error-page :title title :message message :image image :asset-url "/static")',
+        title=f"{errnum} Error",
+        message=message,
+        image=image,
+    )
+
+
 def errors(app):
     def _info(e):
         return {
@@ -82,10 +94,17 @@ def errors(app):
                 errnum='404'
             )
         else:
-            html = await render_template(
-                "_types/root/exceptions/_.html",
-                errnum='404',
-            )
+            # Render via s-expressions (Phase 5 proof-of-concept)
+            try:
+                html = _sexp_error_page(
+                    "404", "NOT FOUND",
+                    image="/static/errors/404.gif",
+                )
+            except Exception:
+                html = await render_template(
+                    "_types/root/exceptions/_.html",
+                    errnum='404',
+                )
 
         return await make_response(html, 404)
 
@@ -98,10 +117,16 @@ def errors(app):
                 errnum='403'
             )
         else:
-            html = await render_template(
-                "_types/root/exceptions/_.html",
-                errnum='403',
-            )
+            try:
+                html = _sexp_error_page(
+                    "403", "FORBIDDEN",
+                    image="/static/errors/403.gif",
+                )
+            except Exception:
+                html = await render_template(
+                    "_types/root/exceptions/_.html",
+                    errnum='403',
+                )
 
         return await make_response(html, 403)
 
diff --git a/shared/sexp/components.py b/shared/sexp/components.py
index d4acfec..7513f49 100644
--- a/shared/sexp/components.py
+++ b/shared/sexp/components.py
@@ -14,6 +14,15 @@ from .jinja_bridge import register_components
 def load_shared_components() -> None:
     """Register all shared s-expression components."""
     register_components(_LINK_CARD)
+    register_components(_CART_MINI)
+    register_components(_AUTH_MENU)
+    register_components(_ACCOUNT_NAV_ITEM)
+    register_components(_CALENDAR_ENTRY_NAV)
+    register_components(_CALENDAR_LINK_NAV)
+    register_components(_MARKET_LINK_NAV)
+    register_components(_POST_CARD)
+    register_components(_BASE_SHELL)
+    register_components(_ERROR_PAGE)
 
 
 # ---------------------------------------------------------------------------
@@ -49,3 +58,243 @@ _LINK_CARD = '''
         (when detail
           (div :class "text-xs text-stone-400 mt-1" detail))))))
 '''
+
+
+# ---------------------------------------------------------------------------
+# ~cart-mini
+# ---------------------------------------------------------------------------
+# Replaces: cart/templates/fragments/cart_mini.html
+#
+# Usage:
+#   sexp('(~cart-mini :cart-count count :blog-url burl :cart-url curl)',
+#         count=0, burl="https://blog.rose-ash.com", curl="https://cart.rose-ash.com")
+# ---------------------------------------------------------------------------
+
+_CART_MINI = '''
+(defcomp ~cart-mini (&key cart-count blog-url cart-url oob)
+  (div :id "cart-mini"
+       :hx-swap-oob oob
+    (if (= cart-count 0)
+      (div :class "h-12 w-12 rounded-full overflow-hidden border border-stone-300 flex-shrink-0"
+        (a :href (str blog-url "/")
+           :class "h-full w-full font-bold text-5xl flex-shrink-0 flex flex-row items-center gap-1"
+          (img :src (str blog-url "/static/img/logo.jpg")
+               :class "h-full w-full rounded-full object-cover border border-stone-300 flex-shrink-0")))
+      (a :href (str cart-url "/")
+         :class "relative inline-flex items-center justify-center text-stone-700 hover:text-emerald-700"
+        (i :class "fa fa-shopping-cart text-5xl" :aria-hidden "true")
+        (span :class "absolute top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2 inline-flex items-center justify-center rounded-full bg-emerald-600 text-white text-sm w-5 h-5"
+          cart-count)))))
+'''
+
+
+# ---------------------------------------------------------------------------
+# ~auth-menu
+# ---------------------------------------------------------------------------
+# Replaces: account/templates/fragments/auth_menu.html
+#
+# Usage:
+#   sexp('(~auth-menu :user-email email :account-url aurl)',
+#         email="user@example.com", aurl="https://account.rose-ash.com")
+# ---------------------------------------------------------------------------
+
+_AUTH_MENU = '''
+(defcomp ~auth-menu (&key user-email account-url)
+  (<>
+    (span :id "auth-menu-desktop" :class "hidden md:inline-flex"
+      (if user-email
+        (a :href (str account-url "/")
+           :class "justify-center cursor-pointer flex flex-row items-center p-3 gap-2 rounded bg-stone-200 text-black"
+           :data-close-details true
+          (i :class "fa-solid fa-user")
+          (span user-email))
+        (a :href (str account-url "/")
+           :class "justify-center cursor-pointer flex flex-row items-center p-3 gap-2 rounded bg-stone-200 text-black"
+           :data-close-details true
+          (i :class "fa-solid fa-key")
+          (span "sign in or register"))))
+    (span :id "auth-menu-mobile" :class "block md:hidden text-md font-bold"
+      (if user-email
+        (a :href (str account-url "/") :data-close-details true
+          (i :class "fa-solid fa-user")
+          (span user-email))
+        (a :href (str account-url "/")
+          (i :class "fa-solid fa-key")
+          (span "sign in or register"))))))
+'''
+
+
+# ---------------------------------------------------------------------------
+# ~account-nav-item
+# ---------------------------------------------------------------------------
+# Replaces: hardcoded HTML in cart/bp/fragments/routes.py
+#           and orders/bp/fragments/routes.py
+#
+# Usage:
+#   sexp('(~account-nav-item :href url :label "orders")', url=cart_url("/orders/"))
+# ---------------------------------------------------------------------------
+
+_ACCOUNT_NAV_ITEM = '''
+(defcomp ~account-nav-item (&key href label)
+  (div :class "relative nav-group"
+    (a :href href
+       :class "justify-center cursor-pointer flex flex-row items-center gap-2 rounded bg-stone-200 text-black p-3"
+       :data-hx-disable true
+      label)))
+'''
+
+
+# ---------------------------------------------------------------------------
+# ~calendar-entry-nav
+# ---------------------------------------------------------------------------
+# Replaces: events/templates/fragments/container_nav_entries.html (per-entry)
+#
+# Usage:
+#   sexp('(~calendar-entry-nav :href url :name name :date-str "Jan 15, 2026 at 14:00")',
+#         url="/events/...", name="Workshop")
+# ---------------------------------------------------------------------------
+
+_CALENDAR_ENTRY_NAV = '''
+(defcomp ~calendar-entry-nav (&key href name date-str nav-class)
+  (a :href href :class nav-class
+    (div :class "w-8 h-8 rounded bg-stone-200 flex-shrink-0")
+    (div :class "flex-1 min-w-0"
+      (div :class "font-medium truncate" name)
+      (div :class "text-xs text-stone-600 truncate" date-str))))
+'''
+
+
+# ---------------------------------------------------------------------------
+# ~calendar-link-nav
+# ---------------------------------------------------------------------------
+# Replaces: events/templates/fragments/container_nav_calendars.html (per-calendar)
+#
+# Usage:
+#   sexp('(~calendar-link-nav :href url :name "My Calendar")', url="/events/...")
+# ---------------------------------------------------------------------------
+
+_CALENDAR_LINK_NAV = '''
+(defcomp ~calendar-link-nav (&key href name nav-class)
+  (a :href href :class nav-class
+    (i :class "fa fa-calendar" :aria-hidden "true")
+    (div name)))
+'''
+
+
+# ---------------------------------------------------------------------------
+# ~market-link-nav
+# ---------------------------------------------------------------------------
+# Replaces: market/templates/fragments/container_nav_markets.html (per-market)
+#
+# Usage:
+#   sexp('(~market-link-nav :href url :name "Farm Shop")', url="/market/...")
+# ---------------------------------------------------------------------------
+
+_MARKET_LINK_NAV = '''
+(defcomp ~market-link-nav (&key href name nav-class)
+  (a :href href :class nav-class
+    (i :class "fa fa-shopping-bag" :aria-hidden "true")
+    (div name)))
+'''
+
+
+# ---------------------------------------------------------------------------
+# ~post-card
+# ---------------------------------------------------------------------------
+# Replaces: blog/templates/_types/blog/_card.html
+#
+# A simplified s-expression version of the blog listing card.
+# The full card is complex (like buttons, card widgets, at_bar with tag/author
+# filtering). This component covers the core card structure; the at_bar and
+# card_widgets are passed as pre-rendered HTML via :at-bar-html and
+# :widgets-html kwargs for incremental migration.
+#
+# Usage:
+#   sexp('(~post-card :title t :slug s :href h ...)', **ctx)
+# ---------------------------------------------------------------------------
+
+_POST_CARD = '''
+(defcomp ~post-card (&key title slug href feature-image excerpt
+                          status published-at updated-at publish-requested
+                          hx-select like-html widgets-html at-bar-html)
+  (article :class "border-b pb-6 last:border-b-0 relative"
+    (when like-html (raw! like-html))
+    (a :href href
+       :hx-get href
+       :hx-target "#main-panel"
+       :hx-select hx-select
+       :hx-swap "outerHTML"
+       :hx-push-url "true"
+       :class "block rounded-xl bg-white shadow hover:shadow-md transition overflow-hidden"
+      (header :class "mb-2 text-center"
+        (h2 :class "text-4xl font-bold text-stone-900" title)
+        (cond
+          (= status "draft")
+            (begin
+              (div :class "flex justify-center gap-2 mt-1"
+                (span :class "inline-block px-2 py-0.5 rounded-full text-xs font-semibold bg-amber-100 text-amber-800" "Draft")
+                (when publish-requested
+                  (span :class "inline-block px-2 py-0.5 rounded-full text-xs font-semibold bg-blue-100 text-blue-800" "Publish requested")))
+              (when updated-at
+                (p :class "text-sm text-stone-500" (str "Updated: " updated-at))))
+          published-at
+            (p :class "text-sm text-stone-500" (str "Published: " published-at))))
+      (when feature-image
+        (div :class "mb-4"
+          (img :src feature-image :alt "" :class "rounded-lg w-full object-cover")))
+      (when excerpt
+        (p :class "text-stone-700 text-lg leading-relaxed text-center" excerpt)))
+    (when widgets-html (raw! widgets-html))
+    (when at-bar-html (raw! at-bar-html))))
+'''
+
+
+# ---------------------------------------------------------------------------
+# ~base-shell — full HTML document wrapper
+# ---------------------------------------------------------------------------
+# Replaces: shared/browser/templates/_types/root/index.html (the <html> shell)
+#
+# Usage: For full-page s-expression rendering (Step 4 proof of concept)
+# ---------------------------------------------------------------------------
+
+_BASE_SHELL = '''
+(defcomp ~base-shell (&key title asset-url &rest children)
+  (<>
+    (raw! "<!doctype html>")
+    (html :lang "en"
+      (head
+        (meta :charset "utf-8")
+        (meta :name "viewport" :content "width=device-width, initial-scale=1")
+        (title title)
+        (style
+          "body{margin:0;min-height:100vh;display:flex;align-items:center;"
+          "justify-content:center;font-family:system-ui,sans-serif;"
+          "background:#fafaf9;color:#1c1917}")
+        (script :src "https://cdn.tailwindcss.com")
+        (link :rel "stylesheet" :href (str asset-url "/fontawesome/css/all.min.css")))
+      (body :class "bg-stone-50 text-stone-900"
+        children))))
+'''
+
+
+# ---------------------------------------------------------------------------
+# ~error-page — styled error page
+# ---------------------------------------------------------------------------
+# Replaces: shared/browser/templates/_types/root/exceptions/_.html
+#           + base.html + 404/message.html + 404/img.html
+#
+# Usage:
+#   sexp('(~error-page :title "Not Found" :message "NOT FOUND" :image img-url :asset-url aurl)',
+#         img_url="/static/errors/404.gif", aurl="/static")
+# ---------------------------------------------------------------------------
+
+_ERROR_PAGE = '''
+(defcomp ~error-page (&key title message image asset-url)
+  (~base-shell :title title :asset-url asset-url
+    (div :class "text-center p-8 max-w-lg mx-auto"
+      (div :class "font-bold text-2xl md:text-4xl text-red-500 mb-4"
+        (div message))
+      (when image
+        (div :class "flex justify-center"
+          (img :src image :width "300" :height "300"))))))
+'''
diff --git a/shared/sexp/page.py b/shared/sexp/page.py
new file mode 100644
index 0000000..29b038c
--- /dev/null
+++ b/shared/sexp/page.py
@@ -0,0 +1,32 @@
+"""
+Full-page s-expression rendering.
+
+Provides ``render_page()`` for rendering a complete HTML page from an
+s-expression, bypassing Jinja entirely.  Used by error handlers and
+(eventually) by route handlers for fully-migrated pages.
+
+Usage::
+
+    from shared.sexp.page import render_page
+
+    html = render_page(
+        '(~error-page :title "Not Found" :message "NOT FOUND" :image img :asset-url aurl)',
+        image="/static/errors/404.gif",
+        asset_url="/static",
+    )
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from .jinja_bridge import sexp
+
+
+def render_page(source: str, **kwargs: Any) -> str:
+    """Render a full HTML page from an s-expression string.
+
+    This is a thin wrapper around ``sexp()`` — it exists to make the
+    intent explicit in call sites (rendering a whole page, not a fragment).
+    """
+    return sexp(source, **kwargs)
diff --git a/shared/sexp/tests/test_components.py b/shared/sexp/tests/test_components.py
new file mode 100644
index 0000000..72c5f10
--- /dev/null
+++ b/shared/sexp/tests/test_components.py
@@ -0,0 +1,280 @@
+"""Tests for shared s-expression components (Phase 5)."""
+
+import pytest
+
+from shared.sexp.jinja_bridge import sexp, _COMPONENT_ENV
+from shared.sexp.components import load_shared_components
+
+
+@pytest.fixture(autouse=True)
+def _load_components():
+    """Ensure all shared components are registered for every test."""
+    _COMPONENT_ENV.clear()
+    load_shared_components()
+
+
+# ---------------------------------------------------------------------------
+# ~cart-mini
+# ---------------------------------------------------------------------------
+
+class TestCartMini:
+    def test_empty_cart_shows_logo(self):
+        html = sexp(
+            '(~cart-mini :cart-count cart-count :blog-url blog-url :cart-url cart-url)',
+            **{"cart-count": 0, "blog-url": "https://blog.example.com", "cart-url": "https://cart.example.com"},
+        )
+        assert 'id="cart-mini"' in html
+        assert "logo.jpg" in html
+        assert "blog.example.com/" in html
+        assert "fa-shopping-cart" not in html
+
+    def test_nonempty_cart_shows_badge(self):
+        html = sexp(
+            '(~cart-mini :cart-count cart-count :blog-url blog-url :cart-url cart-url)',
+            **{"cart-count": 3, "blog-url": "https://blog.example.com", "cart-url": "https://cart.example.com"},
+        )
+        assert 'id="cart-mini"' in html
+        assert "fa-shopping-cart" in html
+        assert "bg-emerald-600" in html
+        assert ">3<" in html
+        assert "cart.example.com/" in html
+
+    def test_oob_attribute(self):
+        html = sexp(
+            '(~cart-mini :cart-count 0 :blog-url "" :cart-url "" :oob "true")',
+        )
+        assert 'hx-swap-oob="true"' in html
+
+    def test_no_oob_when_nil(self):
+        html = sexp(
+            '(~cart-mini :cart-count 0 :blog-url "" :cart-url "")',
+        )
+        assert "hx-swap-oob" not in html
+
+
+# ---------------------------------------------------------------------------
+# ~auth-menu
+# ---------------------------------------------------------------------------
+
+class TestAuthMenu:
+    def test_logged_in(self):
+        html = sexp(
+            '(~auth-menu :user-email user-email :account-url account-url)',
+            **{"user-email": "alice@example.com", "account-url": "https://account.example.com"},
+        )
+        assert 'id="auth-menu-desktop"' in html
+        assert 'id="auth-menu-mobile"' in html
+        assert "alice@example.com" in html
+        assert "fa-solid fa-user" in html
+        assert "sign in or register" not in html
+
+    def test_logged_out(self):
+        html = sexp(
+            '(~auth-menu :account-url account-url)',
+            **{"account-url": "https://account.example.com"},
+        )
+        assert "fa-solid fa-key" in html
+        assert "sign in or register" in html
+
+    def test_desktop_has_data_close_details(self):
+        html = sexp(
+            '(~auth-menu :user-email "x@y.com" :account-url "http://a")',
+        )
+        assert "data-close-details" in html
+
+    def test_two_spans_always_present(self):
+        """Both desktop and mobile spans are always rendered."""
+        for email in ["user@test.com", None]:
+            html = sexp(
+                '(~auth-menu :user-email user-email :account-url account-url)',
+                **{"user-email": email, "account-url": "http://a"},
+            )
+            assert 'id="auth-menu-desktop"' in html
+            assert 'id="auth-menu-mobile"' in html
+
+
+# ---------------------------------------------------------------------------
+# ~account-nav-item
+# ---------------------------------------------------------------------------
+
+class TestAccountNavItem:
+    def test_renders_link(self):
+        html = sexp(
+            '(~account-nav-item :href "/orders/" :label "orders")',
+        )
+        assert 'href="/orders/"' in html
+        assert ">orders<" in html
+        assert "nav-group" in html
+        assert "data-hx-disable" in html
+
+    def test_custom_label(self):
+        html = sexp(
+            '(~account-nav-item :href "/cart/orders/" :label "my orders")',
+        )
+        assert ">my orders<" in html
+
+
+# ---------------------------------------------------------------------------
+# ~calendar-entry-nav
+# ---------------------------------------------------------------------------
+
+class TestCalendarEntryNav:
+    def test_renders_entry(self):
+        html = sexp(
+            '(~calendar-entry-nav :href "/events/entry/1/" :name "Workshop" :date-str "Jan 15, 2026 at 14:00" :nav-class "btn")',
+            **{"date-str": "Jan 15, 2026 at 14:00", "nav-class": "btn"},
+        )
+        assert 'href="/events/entry/1/"' in html
+        assert "Workshop" in html
+        assert "Jan 15, 2026 at 14:00" in html
+
+
+# ---------------------------------------------------------------------------
+# ~calendar-link-nav
+# ---------------------------------------------------------------------------
+
+class TestCalendarLinkNav:
+    def test_renders_calendar_link(self):
+        html = sexp(
+            '(~calendar-link-nav :href "/events/cal/" :name "Art Events" :nav-class "btn")',
+            **{"nav-class": "btn"},
+        )
+        assert 'href="/events/cal/"' in html
+        assert "fa fa-calendar" in html
+        assert "Art Events" in html
+
+
+# ---------------------------------------------------------------------------
+# ~market-link-nav
+# ---------------------------------------------------------------------------
+
+class TestMarketLinkNav:
+    def test_renders_market_link(self):
+        html = sexp(
+            '(~market-link-nav :href "/market/farm/" :name "Farm Shop" :nav-class "btn")',
+            **{"nav-class": "btn"},
+        )
+        assert 'href="/market/farm/"' in html
+        assert "fa fa-shopping-bag" in html
+        assert "Farm Shop" in html
+
+
+# ---------------------------------------------------------------------------
+# ~post-card
+# ---------------------------------------------------------------------------
+
+class TestPostCard:
+    def test_basic_card(self):
+        html = sexp(
+            '(~post-card :title "Hello World" :slug "hello" :href "/hello/"'
+            ' :feature-image "/img/hello.jpg" :excerpt "A test post"'
+            ' :status "published" :published-at "15 Jan 2026"'
+            ' :hx-select "#main-panel")',
+            **{
+                "feature-image": "/img/hello.jpg",
+                "hx-select": "#main-panel",
+                "published-at": "15 Jan 2026",
+            },
+        )
+        assert "<article" in html
+        assert "Hello World" in html
+        assert 'href="/hello/"' in html
+        assert '<img src="/img/hello.jpg"' in html
+        assert "A test post" in html
+
+    def test_draft_status(self):
+        html = sexp(
+            '(~post-card :title "Draft" :slug "draft" :href "/draft/"'
+            ' :status "draft" :updated-at "15 Jan 2026"'
+            ' :hx-select "#main-panel")',
+            **{"hx-select": "#main-panel", "updated-at": "15 Jan 2026"},
+        )
+        assert "Draft" in html
+        assert "bg-amber-100" in html
+        assert "Updated:" in html
+
+    def test_draft_with_publish_requested(self):
+        html = sexp(
+            '(~post-card :title "Pending" :slug "pending" :href "/pending/"'
+            ' :status "draft" :publish-requested true'
+            ' :hx-select "#main-panel")',
+            **{"hx-select": "#main-panel", "publish-requested": True},
+        )
+        assert "Publish requested" in html
+        assert "bg-blue-100" in html
+
+    def test_no_image(self):
+        html = sexp(
+            '(~post-card :title "No Img" :slug "no-img" :href "/no-img/"'
+            ' :status "published" :hx-select "#main-panel")',
+            **{"hx-select": "#main-panel"},
+        )
+        assert "<img" not in html
+
+    def test_widgets_and_at_bar(self):
+        html = sexp(
+            '(~post-card :title "T" :slug "s" :href "/"'
+            ' :status "published" :hx-select "#mp"'
+            ' :widgets-html "<div class=\\"widget\\">W</div>"'
+            ' :at-bar-html "<div class=\\"at-bar\\">B</div>")',
+            **{
+                "hx-select": "#mp",
+                "widgets-html": '<div class="widget">W</div>',
+                "at-bar-html": '<div class="at-bar">B</div>',
+            },
+        )
+        assert 'class="widget"' in html
+        assert 'class="at-bar"' in html
+
+
+# ---------------------------------------------------------------------------
+# ~base-shell and ~error-page
+# ---------------------------------------------------------------------------
+
+class TestBaseShell:
+    def test_renders_full_page(self):
+        html = sexp(
+            '(~base-shell :title "Test" :asset-url "/static" (p "Hello"))',
+            **{"asset-url": "/static"},
+        )
+        assert "<!doctype html>" in html
+        assert "<html" in html
+        assert "<title>Test</title>" in html
+        assert "<p>Hello</p>" in html
+        assert "tailwindcss" in html
+
+
+class TestErrorPage:
+    def test_404_page(self):
+        html = sexp(
+            '(~error-page :title "404 Error" :message "NOT FOUND" :image "/static/errors/404.gif" :asset-url "/static")',
+            **{"asset-url": "/static"},
+        )
+        assert "<!doctype html>" in html
+        assert "NOT FOUND" in html
+        assert "text-red-500" in html
+        assert "/static/errors/404.gif" in html
+
+    def test_error_page_no_image(self):
+        html = sexp(
+            '(~error-page :title "500 Error" :message "SERVER ERROR" :asset-url "/static")',
+            **{"asset-url": "/static"},
+        )
+        assert "SERVER ERROR" in html
+        assert "<img" not in html
+
+
+# ---------------------------------------------------------------------------
+# render_page() helper
+# ---------------------------------------------------------------------------
+
+class TestRenderPage:
+    def test_render_page(self):
+        from shared.sexp.page import render_page
+
+        html = render_page(
+            '(~error-page :title "Test" :message "MSG" :asset-url "/s")',
+            **{"asset-url": "/s"},
+        )
+        assert "<!doctype html>" in html
+        assert "MSG" in html