diff --git a/smartylint/checkout.tpl b/smartylint/checkout.tpl
new file mode 100644
index 0000000..ee010e9
--- /dev/null
+++ b/smartylint/checkout.tpl
@@ -0,0 +1,58 @@
+{include file="header.tpl" page_title="Checkout"}
+
+<section class="checkout">
+    <h1>Review your order</h1>
+
+    {if $cart.items}
+        <table class="cart-summary">
+            <thead>
+                <tr><th>Item</th><th>Qty</th><th>Price</th></tr>
+            </thead>
+            <tbody>
+                {foreach $cart.items as $line}
+                    <tr>
+                        <td>{$line.name}</td>
+                        <td>{$line.quantity}</td>
+                        <td>{$line.subtotal|string_format:"%.2f"}</td>
+                    </tr>
+                {/foreach}
+            </tbody>
+        </table>
+
+        <form action="/checkout/place-order" method="post">
+            <fieldset>
+                <legend>Shipping</legend>
+                <label>Full name <input type="text" name="name" value="{$buyer.name}"></label>
+                <label>Address <input type="text" name="address" value="{$buyer.address}"></label>
+                <label>City <input type="text" name="city" value="{$buyer.city}"></label>
+
+                <label>
+                    Method
+                    <select name="shipping_method">
+                        <option value="standard">Standard</option>
+                        <option value="express">Express</option>
+                    </select>
+                </label>
+
+                {if $shipping_method == "express"}
+                    <p class="note">Express delivery adds {$express_fee|string_format:"%.2f"}.</p>
+
+                {if $promo_code == "WELCOME10"}
+                    <p class="note">Promo applied: 10% off.</p>
+                {/if}
+            </fieldset>
+
+            <fieldset>
+                <legend>Payment</legend>
+                <label>Card number <input type="text" name="card"></label>
+                <label>Coupon <input type="text" name="coupon" value="{$applied_coupon}"></label>
+            </fieldset>
+
+            <button type="submit">Place order</button>
+        </form>
+    {else}
+        <p>Your cart is empty. <a href="/products">Browse products</a>.</p>
+    {/if}
+</section>
+
+{include file="footer.tpl"}
diff --git a/smartylint/email_order.tpl b/smartylint/email_order.tpl
new file mode 100644
index 0000000..2d9a531
--- /dev/null
+++ b/smartylint/email_order.tpl
@@ -0,0 +1,34 @@
+{* order confirmation email — plain text + html sections *}
+
+Subject: Your Demoapp order #{$order.id} is confirmed
+
+Hi {$buyer.name},
+
+Thanks for your order! Here's a summary:
+
+Order #{$order.id}
+Placed: {$order.placed_at}
+Total: {$order.total|string_format:"%.2f"}
+
+Items:
+{foreach $order.items as $line}
+- {$line.name} x {$line.quantity} = {$line.subtotal|string_format:"%.2f"}
+{/foreach}
+
+Shipping to:
+{$buyer.address}
+{$buyer.city}, {$buyer.region} {$buyer.postal_code}
+
+{php}
+    $tracking = isset($order['tracking_number']) ? $order['tracking_number'] : 'pending';
+    echo "Tracking: " . $tracking . "\n";
+{/php}
+
+Track your order:
+https://demoapp.example.com/orders/{$order.id}/track
+
+Questions? Reply to this email or visit https://demoapp.example.com/help.
+
+— The Demoapp team
+
+{*  *}
diff --git a/smartylint/footer.tpl b/smartylint/footer.tpl
new file mode 100644
index 0000000..54b8ee8
--- /dev/null
+++ b/smartylint/footer.tpl
@@ -0,0 +1,35 @@
+    </main>
+
+    <footer class="site-footer">
+        {* *}
+
+        {if true}
+            <div class="footer-links">
+                <a href="/about">About</a>
+                <a href="/help">Help</a>
+                <a href="/privacy">Privacy</a>
+            </div>
+        {/if}
+
+        {if $show_newsletter}
+        {/if}
+
+        {foreach $social_links as $link}
+        {/foreach}
+
+        <div class="copyright">
+            <p>&copy; {$current_year} Demoapp.</p>
+            <p>Build {$build_id|@default:"dev"}</p>
+        </div>
+
+        {if $debug == "true"}
+            <pre class="debug">
+                {$debug_payload}
+            </pre>
+        {/if}
+    </footer>
+
+    {include file=tracking.tpl}
+    {include file="scripts.tpl"}
+</body>
+</html>
diff --git a/smartylint/header.tpl b/smartylint/header.tpl
new file mode 100644
index 0000000..2d872eb
--- /dev/null
+++ b/smartylint/header.tpl
@@ -0,0 +1,38 @@
+{* *}
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>{$page_title} - Demoapp Store</title>
+    <meta name="description" content="{$meta_description}">
+
+    {include file=meta.tpl}
+    {include file="styles.tpl" theme=$current_theme}
+
+    <link rel="canonical" href="https://demoapp.example.com/{$canonical_path}>
+</head>
+<body class="page-{$page_class}">
+
+    <header class="site-header">
+        <a href="/" class="logo">{$site_name}</a>
+
+        <nav class="primary-nav">
+            <ul>
+                {foreach $nav_items as $item}
+                    <li><a href="{$item.url}">{$item.label}</a></li>
+                {/foreach}
+            </ul>
+        </nav>
+
+        {if $cart_count}
+            <a href="/cart" class="cart-link">
+                Cart ({$cart_count})
+            </a>
+        {/if}
+
+        {if $logged_in}
+            <span class="user-greeting">Welcome, {$user_name}!</span>
+        {/if}
+    </header>
+
+    <main class="container">
diff --git a/smartylint/product_detail.tpl b/smartylint/product_detail.tpl
new file mode 100644
index 0000000..fe95f1b
--- /dev/null
+++ b/smartylint/product_detail.tpl
@@ -0,0 +1,54 @@
+{include file="header.tpl" page_title=$Product.name}
+
+<article class="product-detail">
+    <div class="gallery">
+        {foreach $Product.images as $Image}
+            <img src="{$Image.url}" alt="{$Image.alt|@default:""}">
+        {/foreach}
+    </div>
+
+    <div class="info">
+        <h1>{$Product.name}</h1>
+        <p class="sku">SKU: {$Product.sku|@default:"n/a"}</p>
+        <p class="price">{$Product.price|string_format:"%.2f"}</p>
+
+        <div class="description">
+            {$Product.long_description}
+        </div>
+
+        {if $Product.in_stock}
+            <form action="/cart/add" method="post">
+                <input type="hidden" name="product_id" value="{$Product.id}">
+                <label>
+                    Quantity:
+                    <input type="number" name="qty" min="1" value="1">
+                </label>
+                <button type="submit">Add to cart</button>
+            </form>
+        {/if}
+    </div>
+
+    <section class="reviews">
+        <h2>Customer reviews</h2>
+        {foreach $Reviews as $Review}
+            <article class="review">
+                <header>
+                    <strong>{$Review.author_name}</strong>
+                    <time>{$Review.created_at|@default:"recently"}</time>
+                </header>
+                <p>{$Review.body}</p>
+            </article>
+        {/foreach}
+    </section>
+
+    {if $RelatedProducts}
+        <aside class="related">
+            <h2>You may also like</h2>
+            {foreach $RelatedProducts as $Related}
+                <a href="/products/{$Related.slug}">{$Related.name}</a>
+            {/foreach}
+        </aside>
+    {/if}
+</article>
+
+{include file="footer.tpl"}
diff --git a/smartylint/product_list.tpl b/smartylint/product_list.tpl
new file mode 100644
index 0000000..84cc436
--- /dev/null
+++ b/smartylint/product_list.tpl
@@ -0,0 +1,41 @@
+{include file=header.tpl page_title="All Products"}
+
+<section class="product-grid">
+    <h1>{$category_name}</h1>
+
+    <p class="result-count">
+        Showing {$result_count} results for "{$search_query}"
+    </p>
+
+    {if $products}
+        <ul class="products">
+            {foreach $products as $product}
+                <li class="product-card" data-id="{$product.id}">
+                    <a href="/products/{$product.slug}">
+                        <img src="{$product.image_url}" alt="{$product.name}">
+                        <h2>{$product.name}</h2>
+                        <p class="price">{$product.price|string_format:"%.2f"}</p>
+                        <p class="description">{$product.short_description}</p>
+                    </a>
+
+                    {if $product.on_sale}
+                        <span class="sale-badge">{$product.discount_label}</span>
+                    {/if}
+
+                    <button data-product="{$product.id}" data-name={$product.name}>
+                        Add to cart
+                    </button>
+                </li>
+        </ul>
+    {else}
+        <p>No products matched your filters.</p>
+    {/if}
+
+    <nav class="pagination">
+        {foreach $pages as $page}
+            <a href="?page={$page}">{$page}</a>
+        {/foreach}
+    </nav>
+</section>
+
+{include file="footer.tpl"}