diff --git a/src/components/primitives/Callout.astro b/src/components/primitives/Callout.astro
new file mode 100644
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+++ b/src/components/primitives/Callout.astro
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+---
+// Callout — gold-background emphasis block. Covers the two existing variants
+// the source uses:
+//   • `variant="label"` (default) — 150px label + body. Matches `.callout`.
+//   • `variant="split"` — 2 equal columns; the named `aside` slot fills the
+//     right column. Matches the full-guide `.thesis` (where the right side
+//     holds a "signal" visualisation).
+//
+// Background is always `var(--gold)`. The label uses the Eyebrow treatment.
+// The body slot expects a `<strong>` for the `clamp(22px, 3vw, 36px)`
+// emphasis; without one, the body falls back to inherited body type.
+
+interface Props {
+  /** Short uppercase label, same treatment as Eyebrow. */
+  label: string;
+  /** Colour tone for the label. */
+  tone?: 'accent' | 'gold' | 'red';
+  /** Layout variant. Defaults to the label+body `.callout` shape. */
+  variant?: 'label' | 'split';
+}
+
+const { label, tone = 'accent', variant = 'label' } = Astro.props;
+---
+
+<section class:list={['callout', `variant-${variant}`]}>
+  <span class:list={['label', `tone-${tone}`]}>{label}</span>
+  <div class="body"><slot /></div>
+  {
+    variant === 'split' && (
+      <div class="aside">
+        <slot name="aside" />
+      </div>
+    )
+  }
+</section>
+
+<style>
+  .callout {
+    display: grid;
+    grid-template-columns: 150px 1fr;
+    gap: 30px;
+    margin-top: 70px;
+    padding: 27px;
+    background: var(--gold);
+  }
+
+  /* Thesis variant: 2 equal columns with the right column reserved for the
+     aside slot. Matches full-guide `.thesis`. */
+  .callout.variant-split {
+    grid-template-columns: 1fr 1fr;
+    align-items: center;
+    margin-top: 0;
+    margin-bottom: 110px;
+    padding: 28px;
+  }
+  .callout.variant-split .body {
+    display: grid;
+    gap: 16px;
+  }
+
+  /* The label spans the eyebrow treatment. In `split` mode it lives inside
+     the first column alongside the body, so it sits as a stack item. */
+  .label {
+    font:
+      600 var(--step-0) 'DM Mono',
+      monospace;
+    letter-spacing: 0.1em;
+    text-transform: uppercase;
+  }
+  .callout.variant-split .label {
+    align-self: start;
+  }
+
+  /* The body renders the slot verbatim; the strong treatment that the source
+     markup uses is set here so the call site can just write <strong>…</strong>. */
+  .body :global(strong) {
+    max-width: 850px;
+    font-size: clamp(22px, 3vw, 36px);
+    line-height: 1.1;
+  }
+  .callout.variant-split .body :global(strong) {
+    font-size: clamp(24px, 4vw, 46px);
+    line-height: 1.05;
+    letter-spacing: -0.04em;
+  }
+
+  .tone-accent {
+    color: var(--accent);
+  }
+  .tone-gold {
+    color: var(--gold);
+  }
+  .tone-red {
+    color: var(--red);
+  }
+
+  @media (max-width: 800px) {
+    .callout,
+    .callout.variant-split {
+      grid-template-columns: 1fr;
+    }
+  }
+</style>
diff --git a/src/components/primitives/CodeBlock.astro b/src/components/primitives/CodeBlock.astro
new file mode 100644
index 0000000..ac910ee
--- /dev/null
+++ b/src/components/primitives/CodeBlock.astro
@@ -0,0 +1,50 @@
+---
+// CodeBlock — `<pre>` on `--ink` with gold text. Default treatment matches
+// `.worktrees pre` from `styles.css` and the dark pre blocks across the
+// guide (rule stage-detail, skill-detail, example-grid, copy-lab, prompt-card,
+// install-skills). It is the one canonical "code on dark" surface — every
+// page-level variation (the `.skills>pre` lighter text, the `.builder-artifact`
+// grid backdrop, etc.) layers extra styles on top via the call site.
+//
+// `tone` flips between the warm `--gold` (default) and the lighter `--paper`
+// for the few blocks that read as documentation rather than terminal output.
+
+interface Props {
+  /** Text colour, mapped to a token. Default is the warm gold used on every
+   *  current `.worktrees pre` and rule `.stage-detail pre` style. */
+  tone?: 'gold' | 'paper';
+  /** Optional accessible label. Use when the contents have no heading context. */
+  label?: string;
+}
+
+const { tone = 'gold', label } = Astro.props;
+---
+
+<pre class:list={['code-block', `tone-${tone}`]} aria-label={label}>
+  <code><slot /></code>
+</pre>
+
+<style>
+  .code-block {
+    margin: 32px 0 0;
+    padding: 20px;
+    overflow: auto;
+    color: var(--gold);
+    background: var(--ink);
+  }
+
+  /* Deliberately no font declaration. `.worktrees pre` — the block this
+     component reproduces — sets none either, so the text inherits the UA
+     default for `pre`. Declaring one here would change how the page renders,
+     which is a redesign, not a refactor.
+     Two *other* legacy blocks do set one, and neither is this component's job:
+     `chapters.css .panel code` (14px/1.8 ui-monospace) and
+     `skills-review/styles.css .preview code` (12px/1.65 ui-monospace). Whoever
+     migrates those needs tokens for them first. */
+
+  /* Lighter text used by `.skills>pre` and a handful of preview blocks where
+     the content reads as documentation rather than a terminal session. */
+  .tone-paper {
+    color: var(--paper);
+  }
+</style>
diff --git a/src/components/primitives/Eyebrow.astro b/src/components/primitives/Eyebrow.astro
new file mode 100644
index 0000000..82ad33b
--- /dev/null
+++ b/src/components/primitives/Eyebrow.astro
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+---
+// Eyebrow — the small uppercase monospace label that opens almost every
+// section on the guide surface. Single most repeated treatment on the site
+// (19+ HTML occurrences) and a signature of the design.
+//
+// `tone` maps directly to the design-system tokens. Pages inside a `--deep`
+// surface (e.g. `.worktrees`) pass `tone="gold"` so the label stays readable
+// on the dark background. Chapters pages (drifted palette) use `tone="red"`.
+//
+// The font stack keeps 'DM Mono' first — when the broken @font-face gets
+// fixed, the intended face will render. Today it falls through to the generic
+// monospace, which is what the site has been rendering all along.
+
+interface Props {
+  /** Short uppercase label, rendered literally. Wrap in markup at the call site
+   *  if you need an inline icon or emphasis inside the eyebrow. */
+  label: string;
+  /** Colour tone. Maps to a token; defaults to the guide-surface accent. */
+  tone?: 'accent' | 'gold' | 'red';
+  /** Element override. The default `<p>` matches the source markup; pass
+   *  `"span"` when the eyebrow sits inside another block. */
+  as?: 'p' | 'span' | 'div';
+}
+
+const { label, tone = 'accent', as: Tag = 'p' } = Astro.props;
+---
+
+<Tag class:list={['eyebrow', `tone-${tone}`]}>{label}</Tag>
+
+<style>
+  .eyebrow {
+    margin: 0;
+    /* UNRESOLVED — this consolidates three drifted legacy declarations and
+       matches none of them exactly:
+         styles.css              500 10px 'DM Mono', monospace   .1em
+         chapters.css            700 11px monospace              .12em
+         skills-review/styles.css 700 10px monospace             .1em
+       `var(--step-0)` (11px) is task 02's decided token, so the size is
+       deliberate. The 600 weight is not — legacy uses 500 and 700, never 600.
+       Settle this with the font decision in .agents/context/design-system.md;
+       until then this renders slightly differently from every source block. */
+    font:
+      600 var(--step-0) 'DM Mono',
+      monospace;
+    letter-spacing: 0.1em;
+    text-transform: uppercase;
+  }
+  .tone-accent {
+    color: var(--accent);
+  }
+  .tone-gold {
+    color: var(--gold);
+  }
+  .tone-red {
+    color: var(--red);
+  }
+</style>
diff --git a/src/components/primitives/Rule.astro b/src/components/primitives/Rule.astro
new file mode 100644
index 0000000..a0fafb1
--- /dev/null
+++ b/src/components/primitives/Rule.astro
@@ -0,0 +1,69 @@
+---
+// Rule — the gold-top-border section divider. One occurrence today
+// (`<aside class="rule">` in the full guide), built so the next page that
+// needs the same beat doesn't reinvent it.
+//
+// Layout is a 150px label column + body, matching `styles.css`'s `.rule`:
+// 2-column grid, 30px gap, 4px solid var(--gold) top border, 22px top
+// padding, 55px top margin. The body expects a single `<strong>` to carry
+// the `clamp(24px, 3.3vw, 42px)` emphasis; anything else falls back to body
+// type via the default slot.
+
+interface Props {
+  /** Short uppercase label, same treatment as Eyebrow but rendered as a
+   *  `<span>` so it can live inside an `<aside>`. */
+  label: string;
+  /** Colour tone for the label. */
+  tone?: 'accent' | 'gold' | 'red';
+}
+
+const { label, tone = 'accent' } = Astro.props;
+---
+
+<aside class="rule">
+  <span class:list={['label', `tone-${tone}`]}>{label}</span>
+  <div class="body"><slot /></div>
+</aside>
+
+<style>
+  .rule {
+    display: grid;
+    grid-template-columns: 150px 1fr;
+    gap: 30px;
+    margin-top: 55px;
+    padding-top: 22px;
+    border-top: 4px solid var(--gold);
+  }
+
+  .label {
+    font:
+      600 var(--step-0) 'DM Mono',
+      monospace;
+    letter-spacing: 0.1em;
+    text-transform: uppercase;
+  }
+
+  /* The body renders the slot verbatim; the strong treatment that the source
+     markup uses is set here so the call site can just write <strong>…</strong>. */
+  .body :global(strong) {
+    max-width: 850px;
+    font-size: clamp(24px, 3.3vw, 42px);
+    line-height: 1.12;
+  }
+
+  .tone-accent {
+    color: var(--accent);
+  }
+  .tone-gold {
+    color: var(--gold);
+  }
+  .tone-red {
+    color: var(--red);
+  }
+
+  @media (max-width: 800px) {
+    .rule {
+      grid-template-columns: 1fr;
+    }
+  }
+</style>