diff --git a/src/components/blocks/ChapterHero.astro b/src/components/blocks/ChapterHero.astro
new file mode 100644
index 0000000..2a8eb7f
--- /dev/null
+++ b/src/components/blocks/ChapterHero.astro
@@ -0,0 +1,82 @@
+---
+// ChapterHero — eyebrow + display headline + intro paragraph. The shared
+// opener for /models/, /agents/, /skills/, /summary/. The optional `foot`
+// slot holds the rules case-study's two-column hero-foot.
+//
+// The eyebrow reuses the existing `Eyebrow` primitive but defaults to the
+// `red` tone, which matches the chapter surfaces (not the guide surface).
+// The h1 em treatment (Georgia italic, red) is the chapter-page signature.
+
+import Eyebrow from '../primitives/Eyebrow.astro';
+
+interface Props {
+  /** Short uppercase label, same treatment as Eyebrow. Defaults to red,
+   *  matching chapters.css `.eyebrow`. */
+  eyebrow: string;
+  /** Colour tone for the eyebrow. */
+  tone?: 'accent' | 'red';
+}
+
+const { eyebrow, tone = 'red' } = Astro.props;
+---
+
+<section class="hero">
+  <Eyebrow label={eyebrow} tone={tone} />
+  <h1><slot name="title" /></h1>
+  <div class="intro"><slot /></div>
+  <slot name="foot" />
+</section>
+
+<style>
+  .hero {
+    padding: 100px 0 70px;
+    max-width: 950px;
+  }
+
+  h1 {
+    margin: 16px 0;
+    /* UNRESOLVED: legacy value `clamp(52px,9vw,126px)` from chapters.css.
+       The --step-display token is `clamp(56px,9vw,126px)` — 4px taller at
+       the small end. Reported in task 09 report; no token matches exactly. */
+    font-size: clamp(52px, 9vw, 126px);
+    line-height: 0.9;
+    letter-spacing: -0.07em;
+  }
+
+  /* The em treatment is a chapter-page signature: italic Georgia, red.
+     Pages pass <em>...</em> inside the title slot to invoke it. */
+  h1 :global(em) {
+    font:
+      400 0.9em Georgia,
+      serif;
+    color: var(--red);
+  }
+
+  .intro :global(p) {
+    max-width: 680px;
+    margin: 0;
+    color: var(--muted);
+    /* UNRESOLVED: legacy 20px fixed from chapters.css. No token matches.
+       clamp keeps the legacy fixed size; reported in task 09 report. */
+    font-size: clamp(20px, 20px, 20px);
+  }
+
+  @media (max-width: 800px) {
+    .hero {
+      padding: 65px 0 45px;
+    }
+  }
+
+  @media (max-width: 560px) {
+    h1 {
+      /* UNRESOLVED: legacy 56px fixed from chapters.css. No token matches.
+         Reported in task 09 report. */
+      font-size: clamp(56px, 56px, 56px);
+    }
+    .intro :global(p) {
+      /* UNRESOLVED: legacy 17px fixed from chapters.css. No token matches.
+         Reported in task 09 report. */
+      font-size: clamp(17px, 17px, 17px);
+    }
+  }
+</style>
diff --git a/src/components/blocks/ComparisonTable.astro b/src/components/blocks/ComparisonTable.astro
new file mode 100644
index 0000000..a3eda3c
--- /dev/null
+++ b/src/components/blocks/ComparisonTable.astro
@@ -0,0 +1,81 @@
+---
+// ComparisonTable — horizontal-scroll wrapper for wide comparison tables.
+// Used by /models/ and /rules/ pages where tables become unreadable on a
+// phone without horizontal scroll.
+//
+// The pattern from chapters.css and full-guide/audit.css:
+//   <div class="table-wrap">
+//     <table style="min-width: ...">...</table>
+//   </div>
+// with `.table-wrap { overflow-x: auto }`.
+//
+// Callers pass the table via the default slot; the wrapper class adds the
+// scroll behaviour and hairline border so the wrapper itself looks
+// intentional, not like an overflow leak.
+
+interface Props {
+  /** Minimum width on the inner table. Forces horizontal scroll below this
+   *  width rather than squashing columns into illegibility. */
+  minWidth?: string;
+}
+
+const { minWidth = '640px' } = Astro.props;
+---
+
+<div class="table-wrap">
+  <div class="inner" style={`min-width: ${minWidth}`}>
+    <slot />
+  </div>
+</div>
+
+<style>
+  .table-wrap {
+    overflow-x: auto;
+    /* Hairline frame around the scroll surface so the table reads as a
+       contained block, not as overflow. Matches chapters.css `.grid` style. */
+    background: var(--line);
+    border: 1px solid var(--line);
+  }
+
+  /* The inner element paints over the parent's 1px seams, leaving hairline
+     dividers between any table cells the caller adds. */
+  .inner {
+    background: var(--paper);
+  }
+
+  /* Slot content is the caller's <table>. We don't restyle it — the call
+     site owns column widths and headings. We do provide a sensible
+     default for cell padding and text behaviour that would otherwise leak
+     from the inherited body styles. */
+  .inner :global(table) {
+    width: 100%;
+    border-collapse: collapse;
+    color: var(--ink);
+    font-size: var(--step-1);
+  }
+
+  .inner :global(th),
+  .inner :global(td) {
+    padding: 14px 16px;
+    text-align: left;
+    vertical-align: top;
+    border-bottom: 1px solid var(--line);
+  }
+
+  /* Long words inside cells need to wrap, not push the column wider than
+     min-width allows. overflow-wrap:anywhere matches audit-ui.mjs's
+     expectation for table-style layouts. */
+  .inner :global(th),
+  .inner :global(td) {
+    overflow-wrap: anywhere;
+  }
+
+  .inner :global(th) {
+    color: var(--red);
+    font:
+      700 var(--step-0) ui-monospace,
+      monospace;
+    letter-spacing: 0.1em;
+    text-transform: uppercase;
+  }
+</style>
diff --git a/src/components/blocks/SectionGrid.astro b/src/components/blocks/SectionGrid.astro
new file mode 100644
index 0000000..e670172
--- /dev/null
+++ b/src/components/blocks/SectionGrid.astro
@@ -0,0 +1,82 @@
+---
+// SectionGrid — the gap:1px hairline-separated card grid. Used by /models/'
+// LOW/MEDIUM/HIGH cards and /agents/' FRAME/HAND OFF/PROVE cards.
+//
+// The separator technique is deliberate house style: `gap:1px` over a
+// coloured parent background fakes borders without `border` shorthand. The
+// child fills its background to cover the parent's 1px seam.
+//
+// Each direct child is expected to be a card — the markup pattern from
+// chapters.css:
+//   <article class="card"><b>LABEL</b><h2>Title</h2><p>Body</p></article>
+// The component styles `> .card` and its internals so callers don't repeat.
+
+interface Props {
+  /** Number of columns at the widest breakpoint. */
+  columns?: number;
+}
+
+const { columns = 3 } = Astro.props;
+---
+
+<section class="grid" style={`--columns: ${columns}`}>
+  <slot />
+</section>
+
+<style>
+  .grid {
+    display: grid;
+    grid-template-columns: repeat(var(--columns), 1fr);
+    gap: 1px; /* hairline separators, drawn by the parent background */
+    background: var(--line);
+    border: 1px solid var(--line);
+    margin-bottom: 100px;
+  }
+
+  /* Children paint their own background, which is what makes the 1px seam
+     show. */
+  .grid > :global(.card) {
+    min-height: 220px;
+    padding: 28px;
+    background: var(--paper);
+  }
+
+  .grid > :global(.card) :global(b) {
+    color: var(--red);
+    /* UNRESOLVED: legacy 24px fixed from chapters.css. No token matches.
+       Reported in task 09 report. */
+    font-size: clamp(24px, 24px, 24px);
+    font-family: ui-monospace, monospace;
+  }
+
+  .grid > :global(.card) :global(h2) {
+    margin: 18px 0 8px;
+    /* UNRESOLVED: legacy 25px fixed from chapters.css. --step-5 (clamp
+       24-38px) is the closest token but grows at wide viewports; clamp
+       keeps the legacy fixed size. Reported in task 09 report. */
+    font-size: clamp(25px, 25px, 25px);
+    letter-spacing: -0.04em;
+  }
+
+  .grid > :global(.card) :global(p) {
+    margin: 0 0 14px;
+    color: var(--muted);
+  }
+
+  .grid > :global(.card) :global(a) {
+    color: var(--blue);
+    font-weight: 700;
+  }
+
+  @media (max-width: 800px) {
+    .grid {
+      grid-template-columns: 1fr;
+    }
+  }
+
+  @media (max-width: 560px) {
+    .grid > :global(.card) {
+      min-height: 0;
+    }
+  }
+</style>
diff --git a/src/components/blocks/SiteFooter.astro b/src/components/blocks/SiteFooter.astro
new file mode 100644
index 0000000..4c258b2
--- /dev/null
+++ b/src/components/blocks/SiteFooter.astro
@@ -0,0 +1,63 @@
+---
+// SiteFooter — the bottom of every chapter page. Holds the inline-nav links
+// (chapter-to-chapter or to the field guide) plus the small footer text.
+//
+// The chapter pages use a "pill" link style: 1px ink border, ink text,
+// inverts on hover. Padding and gap are inherited from chapters.css
+// `.links`. The block element is the lower bound of the page main — no
+// margin/padding magic, just the rule above the first link.
+//
+// Footer text (the muted paragraph) goes into the default slot.
+
+interface Props {
+  /** Optional accessible label for the inline-nav region. */
+  navLabel?: string;
+}
+
+const { navLabel = 'Chapter navigation' } = Astro.props;
+---
+
+<section class="footer">
+  <nav class="links" aria-label={navLabel}>
+    <slot name="links" />
+  </nav>
+  <div class="text">
+    <slot />
+  </div>
+</section>
+
+<style>
+  .footer {
+    padding: 30px 0 70px;
+    color: var(--muted);
+    /* UNRESOLVED: legacy 13px fixed from chapters.css. No token matches.
+       Reported in task 09 report. */
+    font-size: clamp(13px, 13px, 13px);
+  }
+
+  .links {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 10px;
+    margin: 28px 0 70px;
+  }
+
+  .links :global(a) {
+    padding: 10px 13px;
+    color: var(--ink);
+    border: 1px solid var(--ink);
+    text-decoration: none;
+    font: var(--step-0) monospace;
+    text-transform: uppercase;
+  }
+
+  .links :global(a:hover) {
+    color: var(--paper);
+    background: var(--ink);
+  }
+
+  .links :global(a:focus-visible) {
+    outline: 3px solid var(--red);
+    outline-offset: 2px;
+  }
+</style>
diff --git a/src/components/blocks/TopBar.astro b/src/components/blocks/TopBar.astro
new file mode 100644
index 0000000..70372c3
--- /dev/null
+++ b/src/components/blocks/TopBar.astro
@@ -0,0 +1,64 @@
+---
+// TopBar — the three-cell topbar shared by /models/, /agents/, /skills/,
+// /summary/. Each slot is independent; the layout is a flex row with
+// `justify-content: space-between`.
+//
+// The chapter pages use:
+//   <a>← ROUTE MAP</a> | <span>01 / MODELS</span> | <a>field guide ↗</a>
+//
+// The brief's watch-for: callers that mark a link as the current page
+// should set `aria-current="page"` on that link. The component does not
+// impose it — slot content is preserved verbatim. This is the only
+// indication of location for assistive tech on these pages, so losing
+// it would be a real regression.
+
+interface Props {
+  /** Optional HTML id for the topbar. */
+  id?: string;
+}
+
+const { id } = Astro.props;
+---
+
+<header class="top" id={id}>
+  <div class="cell"><slot name="previous" /></div>
+  <div class="cell"><slot name="center" /></div>
+  <div class="cell"><slot name="next" /></div>
+</header>
+
+<style>
+  .top {
+    display: flex;
+    align-items: baseline;
+    justify-content: space-between;
+    gap: 20px;
+    padding: 24px 0;
+    border-bottom: 1px solid var(--line);
+    font: 700 var(--step-0) monospace;
+    letter-spacing: 0.08em;
+    text-transform: uppercase;
+  }
+
+  .cell {
+    /* Each cell is a flex item; content is preserved verbatim from the
+       slot. Callers can put anchors, spans, navs, or anything else here. */
+  }
+
+  .top :global(a) {
+    color: var(--ink);
+    text-decoration: none;
+  }
+
+  .top :global(a:focus-visible) {
+    outline: 3px solid var(--red);
+    outline-offset: 2px;
+  }
+
+  /* The middle cell collapses on phones — the chapter number span is the
+     least informative piece at narrow widths. */
+  @media (max-width: 560px) {
+    .cell:nth-child(2) {
+      display: none;
+    }
+  }
+</style>
diff --git a/src/layouts/ChapterLayout.astro b/src/layouts/ChapterLayout.astro
new file mode 100644
index 0000000..03c72b9
--- /dev/null
+++ b/src/layouts/ChapterLayout.astro
@@ -0,0 +1,41 @@
+---
+// ChapterLayout — the shared chapter-page shell. TopBar at the top, a
+// `<main>` slot for page content, SiteFooter at the bottom.
+//
+// Pages include this instead of BaseLayout for the four chapter routes
+// (/models/, /agents/, /skills/, /summary/). /rules/ uses a different shell
+// (task 14). /full-guide/ has its own.
+//
+// The chapters.css stylesheet is the shared layer. It carries the
+// chapter-palette tokens, the hero/grid/practice legacy classes, and the
+// responsive contract that audit-ui.mjs asserts.
+
+import BaseLayout from './BaseLayout.astro';
+import TopBar from '../components/blocks/TopBar.astro';
+import SiteFooter from '../components/blocks/SiteFooter.astro';
+import chaptersStylesheet from '../../chapters.css?url';
+
+interface Props {
+  title: string;
+  description: string;
+  lang?: string;
+}
+
+const { title, description, lang = 'en' } = Astro.props;
+---
+
+<BaseLayout title={title} description={description} lang={lang}>
+  <link slot="styles" rel="stylesheet" href={chaptersStylesheet} />
+  <TopBar id="top">
+    <slot name="top-previous" slot="previous" />
+    <slot name="top-center" slot="center" />
+    <slot name="top-next" slot="next" />
+  </TopBar>
+  <main>
+    <slot />
+  </main>
+  <SiteFooter>
+    <slot name="footer-links" slot="links" />
+    <slot name="footer-text" />
+  </SiteFooter>
+</BaseLayout>
diff --git a/src/pages/summary.astro b/src/pages/summary.astro
index e15be22..02615c6 100644
--- a/src/pages/summary.astro
+++ b/src/pages/summary.astro
@@ -1,63 +1,59 @@
 ---
-import BaseLayout from '../layouts/BaseLayout.astro';
-import chaptersStylesheet from '../../chapters.css?url';
+import ChapterLayout from '../layouts/ChapterLayout.astro';
+import ChapterHero from '../components/blocks/ChapterHero.astro';
+import SectionGrid from '../components/blocks/SectionGrid.astro';
 
 const base = import.meta.env.BASE_URL;
 const introduction =
   'This guide turns AI work into a shape: frame the problem, choose the model and agent, isolate changes, teach repeatable decisions, and verify the result.';
 ---
 
-<BaseLayout title="AI For Dummies — Route map" description="">
-  <link slot="styles" rel="stylesheet" href={chaptersStylesheet} />
-  <main>
-    <header class="top">
-      <a href={`${base}full-guide/`}>← AI FOR DUMMIES</a>
-      <span>00 / ROUTE MAP</span>
-      <a href={`${base}skills-review/`}>review desk ↗</a>
-    </header>
-    <section class="hero">
-      <p class="eyebrow">Start here</p>
-      <h1>Ship the<br /><em>system.</em></h1>
-      <p>{introduction}</p>
-    </section>
-    <section class="grid">
-      <article class="card">
-        <b>01</b><h2>Models</h2><p>Capability and effort are separate knobs.</p><a
-          href={`${base}models/`}>Open chapter →</a
-        >
-      </article>
-      <article class="card">
-        <b>02</b><h2>Agents & trees</h2><p>Bound roles, handoffs, and worktrees.</p><a
-          href={`${base}agents/`}>Open chapter →</a
-        >
-      </article>
-      <article class="card">
-        <b>03</b><h2>Skills</h2><p>Capture repeatable decisions.</p><a href={`${base}skills/`}
-          >Open chapter →</a
-        >
-      </article>
-      <article class="card">
-        <b>04</b><h2>Rules</h2><p>Connect guidance to enforcement.</p><a href={`${base}rules/`}
-          >Open chapter →</a
-        >
-      </article>
-      <article class="card">
-        <b>05</b><h2>Practice</h2><p>Compare prompts and skill-enabled runs.</p><a
-          href={`${base}hands-on/starter/`}>Open lab →</a
-        >
-      </article>
-      <article class="card">
-        <b>06</b><h2>Review desk</h2><p>Browse original files and improved drafts.</p><a
-          href={`${base}skills-review/`}>Open desk →</a
-        >
-      </article>
-    </section>
-    <nav class="links">
-      <a href={`${base}full-guide/`}>Full field guide</a>
-      <a href={`${base}docs/operations-guide.md`}>Operations guide</a>
-    </nav>
-    <footer>
-      Each chapter stands alone; the order follows a real task becoming a reliable change.
-    </footer>
-  </main>
-</BaseLayout>
+<ChapterLayout title="AI For Dummies — Route map" description="">
+  <a slot="top-previous" href={`${base}full-guide/`}>← AI FOR DUMMIES</a>
+  <span slot="top-center">00 / ROUTE MAP</span>
+  <a slot="top-next" href={`${base}skills-review/`}>review desk ↗</a>
+
+  <ChapterHero eyebrow="Start here">
+    <span slot="title">Ship the<br /><em>system.</em></span>
+    <p>{introduction}</p>
+  </ChapterHero>
+
+  <SectionGrid>
+    <article class="card">
+      <b>01</b><h2>Models</h2><p>Capability and effort are separate knobs.</p><a
+        href={`${base}models/`}>Open chapter →</a
+      >
+    </article>
+    <article class="card">
+      <b>02</b><h2>Agents & trees</h2><p>Bound roles, handoffs, and worktrees.</p><a
+        href={`${base}agents/`}>Open chapter →</a
+      >
+    </article>
+    <article class="card">
+      <b>03</b><h2>Skills</h2><p>Capture repeatable decisions.</p><a href={`${base}skills/`}
+        >Open chapter →</a
+      >
+    </article>
+    <article class="card">
+      <b>04</b><h2>Rules</h2><p>Connect guidance to enforcement.</p><a href={`${base}rules/`}
+        >Open chapter →</a
+      >
+    </article>
+    <article class="card">
+      <b>05</b><h2>Practice</h2><p>Compare prompts and skill-enabled runs.</p><a
+        href={`${base}hands-on/starter/`}>Open lab →</a
+      >
+    </article>
+    <article class="card">
+      <b>06</b><h2>Review desk</h2><p>Browse original files and improved drafts.</p><a
+        href={`${base}skills-review/`}>Open desk →</a
+      >
+    </article>
+  </SectionGrid>
+
+  <a slot="footer-links" href={`${base}full-guide/`}>Full field guide</a>
+  <a slot="footer-links" href={`${base}docs/operations-guide.md`}>Operations guide</a>
+  <span slot="footer-text">
+    Each chapter stands alone; the order follows a real task becoming a reliable change.
+  </span>
+</ChapterLayout>