Implemented phase 4 for the POC prototype in the Website service.

Services/Website/Resources/Static/css/guide.css

@@ -0,0 +1,126 @@
+/* CCN — grading guide. */
+
+.guide,
+.guide__section {
+  display: flex;
+  flex-direction: column;
+}
+
+.guide {
+  gap: var(--space-10);
+}
+
+.guide__head {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-3);
+  max-width: 760px;
+}
+
+.guide__scale {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(72px, 1fr));
+  gap: var(--space-2);
+}
+
+.guide__grade {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 2px;
+  padding: var(--space-2) var(--space-1);
+  border: 1px solid var(--line);
+  border-radius: var(--radius-sm);
+  background: var(--card);
+  color: var(--muted);
+  font-size: 11px;
+  font-weight: 600;
+  letter-spacing: 0.04em;
+}
+
+.guide__grade strong {
+  color: var(--ink);
+  font-family: var(--font-display);
+  font-size: 18px;
+  letter-spacing: 0;
+}
+
+.guide__section {
+  gap: var(--space-5);
+}
+
+.guide__intro {
+  max-width: 720px;
+  color: var(--ink-soft);
+}
+
+.guide__references {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-3);
+}
+
+.guide__reference {
+  display: grid;
+  gap: var(--space-4);
+  align-items: start;
+}
+
+.guide__reference-grade {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-1);
+}
+
+.guide__photo {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  aspect-ratio: 2 / 3;
+  max-width: 140px;
+  padding: var(--space-2);
+  border: 1px dashed var(--rule);
+  border-radius: var(--radius-sm);
+  color: var(--muted);
+  font-size: 11px;
+  font-weight: 600;
+  letter-spacing: 0.08em;
+  text-align: center;
+  text-transform: uppercase;
+}
+
+.guide__reference .type-eyebrow {
+  margin-bottom: var(--space-2);
+}
+
+.guide__allowed {
+  color: var(--good);
+}
+
+.guide__excluded {
+  color: var(--bad);
+}
+
+.guide__defects {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
+  gap: var(--space-4);
+}
+
+.guide__defect {
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+  padding: var(--space-4);
+}
+
+@media (min-width: 1024px) {
+  .guide {
+    padding-top: var(--space-10);
+  }
+
+  .guide__reference {
+    grid-template-columns: 180px 140px minmax(0, 1fr) minmax(0, 1fr);
+    gap: var(--space-6);
+  }
+}

Services/Website/Resources/Static/css/listing.css

@@ -21,6 +21,13 @@
   box-shadow: var(--shadow-cover);
 }
 
+.listing__photos {
+  display: grid;
+  grid-template-columns: repeat(3, minmax(0, 1fr));
+  gap: var(--space-3);
+  padding-top: var(--space-4);
+}
+
 .listing__main {
   display: flex;
   flex: 1 1 auto;

Services/Website/Resources/Static/css/shared.css

@@ -1541,6 +1541,16 @@ textarea.input {
   padding-left: 16cqw;
 }
 
+/* A photo of a copy, cropped to a cover's proportions. */
+.photo {
+  display: block;
+  width: 100%;
+  aspect-ratio: 2 / 3;
+  border-radius: var(--radius-sm);
+  background: var(--tint);
+  object-fit: cover;
+}
+
 /* Listing cards */
 .listing-card {
   position: relative;
@@ -1747,6 +1757,13 @@ textarea.input {
   font-weight: 500;
 }
 
+.select--block {
+  width: 100%;
+  height: var(--control-md);
+  border-color: var(--rule);
+  font-size: 14px;
+}
+
 .sort {
   display: flex;
   align-items: center;

Services/Website/Resources/Static/css/sign-in.css

@@ -69,6 +69,12 @@
   gap: var(--space-7);
 }
 
+.gate__demo {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-3);
+}
+
 .gate__saved {
   display: flex;
   align-items: center;

Services/Website/Resources/Static/css/trade.css

@@ -782,3 +782,117 @@ a.rows__row:hover {
     grid-template-columns: 100px minmax(0, 2fr) 70px minmax(0, 1fr) 340px 130px;
   }
 }
+
+/* ==========================================================================
+   New listing
+   ========================================================================== */
+
+.listing-form,
+.listing-form__form,
+.listing-form__section,
+.listing-form__scope {
+  display: flex;
+  flex-direction: column;
+}
+
+.listing-form {
+  gap: var(--space-6);
+  max-width: calc(880px + 2 * var(--gutter));
+}
+
+.listing-form__head {
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+}
+
+.listing-form__form {
+  gap: var(--space-5);
+}
+
+.listing-form__section {
+  gap: var(--space-5);
+}
+
+.listing-form__scope {
+  gap: var(--space-4);
+}
+
+.listing-form__grid {
+  display: grid;
+  gap: var(--space-4);
+  align-items: start;
+}
+
+.listing-form__modes {
+  display: grid;
+  gap: var(--space-3);
+}
+
+.listing-form__mode {
+  display: flex;
+  align-items: flex-start;
+  gap: var(--space-3);
+  padding: var(--space-4);
+  border: 1px solid var(--rule);
+  border-radius: var(--radius-sm);
+  cursor: pointer;
+}
+
+.listing-form__mode:has(input:checked) {
+  border-color: var(--ink);
+  background: var(--tint);
+}
+
+.listing-form__mode span {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-1);
+  font-size: 14px;
+}
+
+.listing-form__checks {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
+  gap: 10px var(--space-4);
+}
+
+.listing-form__files {
+  padding: var(--space-4);
+  border: 1px dashed var(--rule);
+  border-radius: var(--radius-sm);
+  background: var(--paper);
+  font-size: 13px;
+}
+
+.listing-form__submit {
+  display: flex;
+  justify-content: flex-end;
+  gap: var(--space-3);
+}
+
+.sell__actions {
+  display: flex;
+  flex-wrap: wrap;
+  gap: var(--space-2);
+}
+
+@media (min-width: 600px) {
+  .listing-form__grid {
+    grid-template-columns: repeat(3, minmax(0, 1fr));
+  }
+
+  .listing-form__modes {
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+  }
+
+  .field--wide {
+    grid-column: span 2;
+  }
+}
+
+@media (min-width: 1024px) {
+  .listing-form {
+    padding-top: var(--space-8);
+  }
+}

Services/Website/Resources/Static/js/passkey.js

@@ -0,0 +1,60 @@
+// CCN — passkey sign-in. Without it, or without WebAuthn, the sign-in screen offers the demo sign-in alone.
+
+const form = document.querySelector("[data-passkey-form]");
+const supported = window.PublicKeyCredential
+  && PublicKeyCredential.parseCreationOptionsFromJSON
+  && PublicKeyCredential.parseRequestOptionsFromJSON;
+
+if (form && supported) {
+  const button = form.querySelector("[data-passkey]");
+  const status = form.querySelector("[data-passkey-status]");
+
+  const post = async (path, body) => {
+    const response = await fetch(path, {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify(body),
+    });
+    const answer = await response.json();
+
+    if (!response.ok) {
+      throw new Error(answer.error ?? "Something went wrong. Try again.");
+    }
+
+    return answer;
+  };
+
+  button.hidden = false;
+  button.addEventListener("click", async () => {
+    button.disabled = true;
+    status.textContent = "";
+
+    try {
+      const { mode, options } = await post("/sign-in/passkey/options", { email: form.elements.email.value });
+      let credential;
+
+      if (mode === "create") {
+        // A discoverable passkey, so the next sign-in needs no email.
+        options.authenticatorSelection = { residentKey: "required", userVerification: "preferred" };
+        credential = await navigator.credentials.create({
+          publicKey: PublicKeyCredential.parseCreationOptionsFromJSON(options),
+        });
+      } else {
+        credential = await navigator.credentials.get({
+          publicKey: PublicKeyCredential.parseRequestOptionsFromJSON(options),
+        });
+      }
+
+      const { location } = await post("/sign-in/passkey/finish", {
+        credential: credential.toJSON(),
+        return: form.elements.return.value,
+      });
+
+      window.location.assign(location);
+    } catch (error) {
+      // Dismissing the browser's prompt is not an error worth a message.
+      status.textContent = error.name === "NotAllowedError" ? "" : error.message;
+      button.disabled = false;
+    }
+  });
+}

Services/Website/Resources/Static/js/shared.js

@@ -21,3 +21,22 @@ if (filters) {
   sync();
   desktop.addEventListener("change", sync);
 }
+
+// The new-listing form shows every field without scripts; here, only those that apply to the format and grading picked.
+const listingForm = document.querySelector(".listing-form__form");
+
+if (listingForm) {
+  const apply = () => {
+    const format = listingForm.querySelector("input[name=format]:checked")?.value;
+    const grading = listingForm.querySelector("input[name=grading]:checked")?.value;
+    const single = format === "single-issues";
+    const scopes = { "single-issues": single, collected: !single, slabbed: single && grading === "slabbed" };
+
+    for (const element of listingForm.querySelectorAll("[data-scope]")) {
+      element.hidden = !scopes[element.dataset.scope];
+    }
+  };
+
+  listingForm.addEventListener("change", apply);
+  apply();
+}