Demo enhancements

demo/app-root.ts

@@ -1,26 +1,101 @@
 import { html, LitElement } from 'lit';
 import { customElement } from 'lit/decorators.js';
+// unsafeHTML is needed to render dynamic custom-element tag names;
+// Lit's html`` tag cannot render variable tag names directly.
+import { unsafeHTML } from 'lit/directives/unsafe-html.js';
 
-import '@src/elements/ia-button/ia-button-story';
-import '@src/labs/ia-snow/ia-snow-story';
-import '@src/elements/ia-combo-box/ia-combo-box-story';
-import '@src/elements/ia-status-indicator/ia-status-indicator-story';
+const storyModules = import.meta.glob(
+  ['../src/elements/**/*-story.ts', '../src/labs/**/*-story.ts'],
+  { eager: true }
+);
+
+const storyEntries = Object.keys(storyModules)
+  .map(path => {
+    const labs = path.includes('/src/labs/');
+    const parts = path.split('/');
+    const tag = parts[parts.length - 2];
+    return { tag, storyTag: `${tag}-story`, id: `elem-${tag}`, labs };
+  })
+  .sort((a, b) => a.tag.localeCompare(b.tag));
+
+const productionEntries = storyEntries.filter(e => !e.labs);
+const labsEntries       = storyEntries.filter(e => e.labs);
+const ALL_ENTRIES       = [...productionEntries, ...labsEntries];
 
 @customElement('app-root')
 export class AppRoot extends LitElement {
+  createRenderRoot() { return this; }
+
+  private _observer?: IntersectionObserver;
+
   render() {
     return html`
-      <h1>🏛️ Internet Archive Elements ⚛️</h1>
+      <nav id="ia-sidebar">
+        <h2>Production-Ready</h2>
+        ${productionEntries.map(e => html`<a href="#${e.id}">&lt;${e.tag}&gt;</a>`)}
+        <h2>Labs 🧪</h2>
+        ${labsEntries.map(e => html`<a href="#${e.id}">&lt;${e.tag}&gt;</a>`)}
+      </nav>
+      <div id="ia-content">
+        <h1>Internet Archive Elements</h1>
+        <h2>Production-Ready Elements</h2>
+        ${productionEntries.map(e => html`
+          <div id="${e.id}" class="ia-anchor">
+            ${unsafeHTML(`<${e.storyTag}></${e.storyTag}>`)}
+          </div>
+        `)}
+        <h2>Labs Elements</h2>
+        ${labsEntries.map(e => html`
+          <div id="${e.id}" class="ia-anchor">
+            ${unsafeHTML(`<${e.storyTag}></${e.storyTag}>`)}
+          </div>
+        `)}
+      </div>
+    `;
+  }
 
-      <h2>🚀 Production-Ready Elements</h2>
+  firstUpdated() {
+    const allIds = ALL_ENTRIES.map(e => e.id);
 
-      <ia-status-indicator-story></ia-status-indicator-story>
-      <ia-combo-box-story></ia-combo-box-story>
+    const links = Object.fromEntries(
+      allIds.map(id => [id, this.querySelector(`#ia-sidebar a[href="#${id}"]`)])
+    );
 
-      <h2>🧪 Labs Elements</h2>
+    const visible = new Set<string>();
 
-      <ia-snow-story></ia-snow-story>
-      <ia-button-story></ia-button-story>
-    `;
+    // Only anchors in the top 30% of the viewport count as "active".
+    // The first (topmost) visible anchor wins.
+    this._observer = new IntersectionObserver(
+      entries => {
+        for (const entry of entries) {
+          if (entry.isIntersecting) visible.add(entry.target.id);
+          else visible.delete(entry.target.id);
+        }
+        const activeId = allIds.find(id => visible.has(id)) ?? allIds[0];
+        allIds.forEach(id => links[id]?.classList.toggle('active', id === activeId));
+      },
+      { rootMargin: '0px 0px -70% 0px' },
+    );
+
+    allIds.forEach(id => {
+      const el = document.getElementById(id);
+      if (el) this._observer!.observe(el);
+    });
+
+    allIds.forEach(id => {
+      links[id]?.addEventListener('click', (e: Event) => {
+        e.preventDefault();
+        const el = document.getElementById(id);
+        if (el) {
+          const top = el.getBoundingClientRect().top + window.scrollY;
+          window.scrollTo({ top: Math.max(0, top - 16), behavior: 'smooth' });
+        }
+      });
+    });
+  }
+
+  disconnectedCallback() {
+    super.disconnectedCallback();
+    this._observer?.disconnect();
   }
 }

demo/index.css

@@ -1,5 +1,5 @@
 :root {
-  font-family: system-ui, Avenir, Helvetica, Arial, sans-serif;
+  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
   line-height: 1.5;
   font-weight: 400;
 
@@ -24,7 +24,89 @@ a:hover {
 }
 
 body {
-  margin: 1rem;
+  margin: 0;
   min-width: 320px;
   min-height: 100vh;
+  display: flex;
+}
+
+app-root {
+  display: contents;
+}
+
+#ia-sidebar {
+  width: 200px;
+  flex-shrink: 0;
+  position: sticky;
+  top: 0;
+  height: 100vh;
+  border-right: 1px solid #ddd;
+  padding: 1rem 0;
+  box-sizing: border-box;
+  overflow-y: auto;
+}
+
+#ia-sidebar h2 {
+  font-size: 0.7rem;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.08em;
+  color: #767676;
+  padding: 0 1rem;
+  margin: 0 0 0.5rem;
+}
+
+#ia-sidebar a {
+  display: block;
+  font-size: 0.82rem;
+  font-weight: 400;
+  color: #444;
+  text-decoration: none;
+  padding: 0.3rem 1rem;
+  border-left: 3px solid transparent;
+  transition: background 0.1s, color 0.1s, border-color 0.1s;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+#ia-sidebar a:hover {
+  background: #f0f0f0;
+  color: #213547;
+}
+
+#ia-sidebar a.active {
+  color: #194880;
+  border-left-color: #194880;
+  background: #f0f4f9;
+  font-weight: 600;
+}
+
+#ia-content {
+  flex: 1;
+  padding: 0.75rem 1rem;
+  padding-bottom: 100vh;
+  min-width: 0;
+}
+
+.ia-anchor {
+  scroll-margin-top: 16px;
+}
+
+.ia-anchor > * {
+  display: block;
+  margin-bottom: 0.5rem;
+}
+
+#ia-content h1 {
+  font-size: 1.4rem;
+  margin: 0 0 0.25rem;
+  display: flex;
+  align-items: center;
+}
+
+#ia-content h2 {
+  font-size: 1.1rem;
+  font-weight: 600;
+  margin: 0.75rem 0 0.25rem;
 }

demo/story-components/story-prop-settings.ts

@@ -45,7 +45,6 @@ export class StoryPropsSettings extends LitElement {
     if (!this.propInputData) return nothing;
 
     return html`
-      <h3>Properties</h3>
       <div class="settings-options">
         <table>
           ${this.propInputData.settings.map(

demo/story-components/story-styles-settings.ts

@@ -30,7 +30,6 @@ export class StoryStylesSettings extends LitElement {
     if (!this.styleInputData) return nothing;
 
     return html`
-      <h3>Styles</h3>
       <div class="settings-options">
         <table>
           ${this.styleInputData.settings.map(