Move Neon Tan's landing page from bookshop into Hugo

bookshop already supports this: ALLOWED_ORIGIN + CORS on POST
/arc/{code} exist specifically so a page on the brand's own domain can
call it cross-origin. There was no reason for bookshop to also render
the marketing/landing page itself — that put book copy inside a
generic, brand-agnostic Go template shared across every brand instead
of under normal editorial control like every other page on this site.

/books/neon-tan/ is now a plain Hugo page (content/books/neon-tan.md,
no longer draft-only/metadata-only — it's rendered for real via the new
layouts/books/single.html) with a small JS form
(layouts/partials/arc-redeem-form.html, mirroring the existing
course-enroll-form.html pattern) that POSTs form-encoded straight to
shop.michaelferrara.org/arc/neon-tan. bookshop's GET /arc/{code} page
rendering is no longer used for this campaign; only the POST redemption
and the download/Kindle/read/checkout endpoints still are.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

content/_index.md

@@ -5,4 +5,4 @@ description: "TODO: one-line author bio/description"
 
 TODO: Michael's homepage copy goes here.
 
-Get a free short story: [download the reader magnet](https://shop.michaelferrara.org/arc/neon-tan).
+Get a free short story: [download the reader magnet](/books/neon-tan/).

content/books/neon-tan.md

@@ -2,6 +2,20 @@
 title: "Neon Tan"
 author: "Michael Ferrara"
 cover_image: "https://downloads.michaelferrara.org/neon-tan/neon_tan_cover.jpg"
-description: "The world is stranger than it looks and more meaningful than it lets on. You know this. Sign up to my mailing list and I'll send you a story about an AI, a wisecracking seagull, and a song that needs to be heard."
+description: "An AI's trademark silver-blue suit isn't exactly beach-town vibes, but he's determined to land his song a spot on the weekly top 40 countdown anyway. After a string of failed attempts to get noticed by the countdown's enigmatic curator DJ, he and his wisecracking seagull sidekick stumble into an open mic night just as a malware glitch hits, forcing him to trade analysis for improvisation, rallying tourists into one spontaneous singalong to discover connection was never something you could calculate."
-draft: true
+
+# Optional italic line under the title, for handling an objection up front.
+hero_subhead: "A free short story, plus occasional emails when something new comes out."
+
+# Label on the signup form's submit button.
+cta_text: "Send me the story"
+
+# Code of the bookshop ARC campaign this form redeems (see
+# reground-tools/arc-campaign.sh) — shop.michaelferrara.org/arc/<arc_code>.
+arc_code: "neon-tan"
 ---
+The world is stranger than it looks and more meaningful than it lets on.
+
+You know this.
+
+Sign up to my mailing list and I'll send you a story about an AI, a wisecracking seagull, and a song that needs to be heard.

hugo.toml

@@ -13,6 +13,7 @@ disableKinds = ["taxonomy", "term"]
   description = "TODO: one-line author bio/description"
   author = "Michael Ferrara"
   eec_base_url = "https://eec.michaelferrara.org"
+  bookshop_base_url = "https://shop.michaelferrara.org"
 
 [[menu.footer]]
   name = "Contact"

layouts/books/single.html

@@ -0,0 +1,11 @@
+{{ define "main" }}
+<section class="book-hero">
+  <h1>{{ .Title }}</h1>
+  {{ with .Params.cover_image }}<img class="book-cover" src="{{ . }}" alt="{{ $.Title }} cover">{{ end }}
+  {{ with .Params.hero_subhead }}<p class="book-subhead">{{ . }}</p>{{ end }}
+
+  {{ .Content }}
+
+  {{ partial "arc-redeem-form.html" (dict "id" "top" "page" .) }}
+</section>
+{{ end }}

layouts/partials/arc-redeem-form.html

@@ -0,0 +1,61 @@
+{{ $id := .id }}
+{{ $page := .page }}
+<form id="arc-form-{{ $id }}" class="enroll-form">
+  <label for="arc-email-{{ $id }}">Email</label>
+  <input type="email" id="arc-email-{{ $id }}" name="email" required autocomplete="email" placeholder="you@example.com">
+
+  <div class="field-honeypot" aria-hidden="true">
+    <label for="arc-website-{{ $id }}">Leave this field empty</label>
+    <input type="text" id="arc-website-{{ $id }}" name="website" tabindex="-1" autocomplete="off">
+  </div>
+
+  <p class="field-subscribe">
+    <label><input type="checkbox" id="arc-subscribe-{{ $id }}" name="subscribe" value="1"> Keep me posted on new releases and giveaways</label>
+  </p>
+
+  <button type="submit" class="btn">{{ $page.Params.cta_text | default "Send me the story" }}</button>
+</form>
+<p id="arc-status-{{ $id }}" role="status" class="enroll-status"></p>
+
+<script>
+  (function () {
+    var form = document.getElementById("arc-form-{{ $id }}");
+    var status = document.getElementById("arc-status-{{ $id }}");
+    var arcURL = {{ $page.Site.Params.bookshop_base_url }} + "/arc/" + {{ $page.Params.arc_code }};
+    form.addEventListener("submit", function (e) {
+      e.preventDefault();
+      if (form.website.value) return; // honeypot
+      var submitBtn = form.querySelector("button[type=submit]");
+      submitBtn.disabled = true;
+      status.textContent = "Sending…";
+      var body = new URLSearchParams();
+      body.set("email", form.email.value);
+      if (form.subscribe.checked) body.set("subscribe", "1");
+      fetch(arcURL, {
+        method: "POST",
+        headers: { "Content-Type": "application/x-www-form-urlencoded" },
+        body: body.toString()
+      }).then(function (res) {
+        if (res.ok) {
+          form.reset();
+          form.hidden = true;
+          status.textContent = "Check your email — it's on its way.";
+          return;
+        }
+        submitBtn.disabled = false;
+        if (res.status === 400) {
+          status.textContent = "That doesn't look like a valid email address.";
+        } else if (res.status === 429) {
+          status.textContent = "Too many attempts — try again in a minute.";
+        } else if (res.status === 410) {
+          status.textContent = "This giveaway has ended.";
+        } else {
+          status.textContent = "Something went wrong. Try again in a moment.";
+        }
+      }).catch(function () {
+        submitBtn.disabled = false;
+        status.textContent = "Something went wrong. Try again in a moment.";
+      });
+    });
+  })();
+</script>