diff --git a/platform/footer.php b/platform/footer.php
index 4401c63..655a87a 100644
--- a/platform/footer.php
+++ b/platform/footer.php
@@ -240,4 +240,34 @@ function platform_render_footer(array $opts = []): void
     }
 
     echo '</footer>';
+    platform_render_for_sale_badge($opts);
+}
+
+/** Bottom-right “FOR SALE” ribbon → Contact us (landing page 12). */
+function platform_render_for_sale_badge(array $opts = []): void
+{
+    if (array_key_exists('for_sale_badge', $opts) && !$opts['for_sale_badge']) {
+        return;
+    }
+    $cfg = platform_footer_config();
+    if (array_key_exists('for_sale_badge', $cfg) && !$cfg['for_sale_badge']) {
+        return;
+    }
+    $url = trim((string) ($opts['for_sale_badge_url'] ?? ($cfg['for_sale_badge_url'] ?? '')));
+    if ($url === '') {
+        $url = 'https://apps.f0xx.org/app/androidcast_project/?page=12';
+    }
+    echo '<a href="' . platform_footer_h($url) . '" class="platform-for-sale-badge"'
+        . ' title="Contact us" aria-label="For sale — contact us">';
+    echo '<span class="platform-for-sale-badge__outer">';
+    echo '<span class="platform-for-sale-badge__inner">';
+    echo '<span class="platform-for-sale-badge__letters" aria-hidden="true">';
+    foreach (str_split('FOR SALE') as $ch) {
+        if ($ch === ' ') {
+            echo '<span class="platform-for-sale-badge__space"></span>';
+            continue;
+        }
+        echo '<span class="platform-for-sale-badge__letter">' . platform_footer_h($ch) . '</span>';
+    }
+    echo '</span></span></span></a>';
 }