diff --git a/CLAUDE.md b/CLAUDE.md
index ce500e3a..b9b91889 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -69,7 +69,8 @@ sessions `devenv` is a shell function wrapping it.
   in `src/lib/i18n/index.ts` gives a page's final URL; use it for canonical, hreflang, sitemap and
   feed links. Host redirects live in `vercel.json` (English pages on .de → www.maxdaten.io, `/` on
   .io → `/en`, www.maxdaten.de → apex), tested in `tests/vercel-redirects.test.ts`.
-- `hero.subheadline` doubles as `meta.description` — keep them in sync.
+- The meta description is the first paragraph of `hero.subheadline` (`heroSummary()`, also on the OG
+  card and in llms.txt); keep that paragraph at 155 characters or fewer.
 - When changing translation text, update `tests/e2e/i18n.test.ts`. `src/lib/i18n/i18n.test.ts`
   enforces identical keys across locales and differing values (except `nav.blog`, `nav.gems`,
   `footer.impressum`, `meta.title`, `services.platform.title`, `services.delivery.title`). Test both
diff --git a/scripts/prod-check.mjs b/scripts/prod-check.mjs
index 59869971..3fbb0aa8 100644
--- a/scripts/prod-check.mjs
+++ b/scripts/prod-check.mjs
@@ -12,6 +12,7 @@ const redirects = [
     [`${de}/en`, 308, `${io}/en`],
     [`${de}${post}`, 308, `${io}${post}`],
     [`${io}/`, 308, '/en'],
+    [`${io}/impressum`, 308, `${de}/impressum`],
 ];
 
 // [url, lang, canonical]
@@ -64,6 +65,20 @@ for (const [url, lang, canonical] of pages) {
     );
 }
 
+// Social cards and the robots Sitemap line must point at the final host, not the build origin.
+const postHtml = await (await get(`${io}${post}`)).text();
+const ogImage = postHtml.match(
+    /<meta property="og:image" content="([^"]+)"/
+)?.[1];
+report(ogImage?.startsWith(`${io}/`), `og:image ${ogImage}`);
+for (const host of [io, de]) {
+    const robots = await (await get(`${host}/robots.txt`)).text();
+    report(
+        robots.includes(`Sitemap: ${io}/sitemap.xml`),
+        `${host}/robots.txt names ${io}/sitemap.xml`
+    );
+}
+
 const headers = (await get(`${io}/en`)).headers;
 report(
     headers.get('content-security-policy')?.includes("frame-ancestors 'none'"),
diff --git a/src/lib/components/atoms/Button.svelte b/src/lib/components/atoms/Button.svelte
index 54df01fd..3bad62ae 100644
--- a/src/lib/components/atoms/Button.svelte
+++ b/src/lib/components/atoms/Button.svelte
@@ -1,5 +1,5 @@
 <script lang="ts">
-    import { HttpRegex } from '#lib/utils/regex.js';
+    import { isExternalHref } from '#lib/i18n/index.js';
     import type { Snippet } from 'svelte';
     import type { ClassValue } from 'svelte/elements';
 
@@ -30,7 +30,7 @@
         ...rest
     }: Props = $props();
 
-    const isExternalLink = $derived(!!href && HttpRegex.test(href));
+    const isExternalLink = $derived(!!href && isExternalHref(href));
     let tag = $derived(href ? 'a' : 'button');
     let linkProps = $derived({
         href,
diff --git a/src/lib/components/atoms/Card.svelte b/src/lib/components/atoms/Card.svelte
index b999a245..18543752 100644
--- a/src/lib/components/atoms/Card.svelte
+++ b/src/lib/components/atoms/Card.svelte
@@ -1,5 +1,5 @@
 <script lang="ts">
-    import { HttpRegex } from '#lib/utils/regex.js';
+    import { isExternalHref } from '#lib/i18n/index.js';
     import type { ClassValue, HTMLAnchorAttributes } from 'svelte/elements';
     import type { Snippet } from 'svelte';
 
@@ -22,7 +22,7 @@
         ...rest
     }: Props = $props();
 
-    const isExternalLink = $derived(!!href && HttpRegex.test(href));
+    const isExternalLink = $derived(!!href && isExternalHref(href));
     let tag = $derived(href ? 'a' : 'article');
     let linkProps = $derived({
         href,
diff --git a/src/lib/components/atoms/RssLink.svelte b/src/lib/components/atoms/RssLink.svelte
index 01e3c1fd..b386f5a1 100644
--- a/src/lib/components/atoms/RssLink.svelte
+++ b/src/lib/components/atoms/RssLink.svelte
@@ -1,15 +1,16 @@
 <script lang="ts">
-    import { resolve } from '$app/paths';
+    import { page } from '$app/state';
     import RssIcon from '#lib/icons/rss.svelte';
     import { getContext } from 'svelte';
-    import { t, type Locale } from '#lib/i18n/index.js';
+    import { siteHref, t, type Locale } from '#lib/i18n/index.js';
 
     const getLocale: () => Locale = getContext('locale');
     let locale = $derived(getLocale());
 </script>
 
+<!-- eslint-disable-next-line svelte/no-navigation-without-resolve -- the feed lives on www.maxdaten.io -->
 <a
-    href={resolve('rss.xml')}
+    href={siteHref('/rss.xml', page.url.origin)}
     target="_blank"
     rel="noopener noreferrer"
     aria-label={t(locale, 'social.rss')}
diff --git a/src/lib/components/molecules/BlogPostCard.svelte b/src/lib/components/molecules/BlogPostCard.svelte
index d1cf5693..49b82737 100644
--- a/src/lib/components/molecules/BlogPostCard.svelte
+++ b/src/lib/components/molecules/BlogPostCard.svelte
@@ -1,5 +1,7 @@
 <script lang="ts">
+    import { page } from '$app/state';
     import Card from '#lib/components/atoms/Card.svelte';
+    import { siteHref } from '#lib/i18n/index.js';
     import Tag from '#lib/components/atoms/Tag.svelte';
     import type { ListingPost } from '#lib/sanity/listing.js';
     import { urlFor, generateSrcSet } from '#lib/sanity/image.js';
@@ -49,7 +51,7 @@
 {/snippet}
 
 <Card
-    href="/{post.slug}"
+    href={siteHref(`/${post.slug}`, page.url.origin)}
     class="blog-post-card"
     image={showImage && hasCoverImage ? sanityImage : undefined}
 >
diff --git a/src/lib/components/molecules/GemCard.svelte b/src/lib/components/molecules/GemCard.svelte
index 1b8248de..c5a4ebef 100644
--- a/src/lib/components/molecules/GemCard.svelte
+++ b/src/lib/components/molecules/GemCard.svelte
@@ -12,6 +12,8 @@
     }
 
     interface Props {
+        /** Anchor id, so internal links to a gem (/gems#slug) land on its card. */
+        id?: string;
         title: string;
         coverImage: string | SanityCoverImage;
         excerpt: string;
@@ -23,6 +25,7 @@
     }
 
     let {
+        id,
         title,
         coverImage,
         excerpt,
@@ -41,7 +44,7 @@
     );
 </script>
 
-<Card {href} target="_self" class="gem-card" data-testid="gem-card">
+<Card {id} {href} target="_self" class="gem-card" data-testid="gem-card">
     {#snippet image()}
         {#if cover}
             <div class="cover-image-container">
diff --git a/src/lib/components/organisms/Footer.svelte b/src/lib/components/organisms/Footer.svelte
index 04c909de..509877cb 100644
--- a/src/lib/components/organisms/Footer.svelte
+++ b/src/lib/components/organisms/Footer.svelte
@@ -1,5 +1,6 @@
 <script lang="ts">
-    import { resolve } from '$app/paths';
+    import { page } from '$app/state';
+    import { siteHref } from '#lib/i18n/index.js';
     import Socials from '#lib/components/molecules/Socials.svelte';
     import RssLink from '#lib/components/atoms/RssLink.svelte';
     import type { Author } from '#lib/utils/types.js';
@@ -10,8 +11,10 @@
 <footer>
     <div class="footer-content">
         <div class="legal">
-            <a href={resolve('impressum')}>Impressum</a>
-            <a href={resolve('datenschutz')}>Datenschutz</a>
+            <!-- eslint-disable svelte/no-navigation-without-resolve -- the legal pages live on maxdaten.de -->
+            <a href={siteHref('/impressum', page.url.origin)}>Impressum</a>
+            <a href={siteHref('/datenschutz', page.url.origin)}>Datenschutz</a>
+            <!-- eslint-enable svelte/no-navigation-without-resolve -->
             <span class="copyright">© {new Date().getFullYear()}</span>
         </div>
         <div class="socials">
diff --git a/src/lib/components/organisms/Header.svelte b/src/lib/components/organisms/Header.svelte
index 57ff9ea1..5f98b13a 100644
--- a/src/lib/components/organisms/Header.svelte
+++ b/src/lib/components/organisms/Header.svelte
@@ -1,11 +1,10 @@
 <script lang="ts">
     import { page } from '$app/state';
-    import { resolve } from '$app/paths';
     import Logo from '#lib/components/atoms/Logo.svelte';
     import RssLink from '#lib/components/atoms/RssLink.svelte';
     import LanguageSwitcher from '#lib/components/molecules/LanguageSwitcher.svelte';
     import { getContext } from 'svelte';
-    import { t, type Locale } from '#lib/i18n/index.js';
+    import { homeHref, siteHref, t, type Locale } from '#lib/i18n/index.js';
 
     interface Props {
         showBackground?: boolean;
@@ -26,20 +25,25 @@
     }
 </script>
 
+<!-- eslint-disable svelte/no-navigation-without-resolve -- siteHref() gives each page's final URL, which may be on the other domain -->
 <header class:has-background={showBackground}>
     <nav class="container">
-        <a class="logo" href={resolve('')} aria-label="maxdaten.io">
+        <a
+            class="logo"
+            href={homeHref(locale, page.url.origin)}
+            aria-label="maxdaten.io"
+        >
             <Logo />
         </a>
         <div class="links">
             <a
-                href={resolve('blog')}
+                href={siteHref('/blog', page.url.origin)}
                 class:active={isActive('/blog')}
                 aria-current={isActive('/blog') ? 'page' : undefined}
                 >{t(locale, 'nav.blog')}</a
             >
             <a
-                href={resolve('gems')}
+                href={siteHref('/gems', page.url.origin)}
                 class:active={isActive('/gems')}
                 aria-current={isActive('/gems') ? 'page' : undefined}
                 >{t(locale, 'nav.gems')}</a
@@ -50,6 +54,8 @@
     </nav>
 </header>
 
+<!-- eslint-enable svelte/no-navigation-without-resolve -->
+
 <style>
     header {
         position: relative;
diff --git a/src/lib/components/organisms/RecentPosts.svelte b/src/lib/components/organisms/RecentPosts.svelte
index 172aee85..726a9032 100644
--- a/src/lib/components/organisms/RecentPosts.svelte
+++ b/src/lib/components/organisms/RecentPosts.svelte
@@ -3,8 +3,9 @@
     import ContentSection from '#lib/components/organisms/ContentSection.svelte';
     import type { ListingPost } from '#lib/sanity/listing.js';
     import Button from '#lib/components/atoms/Button.svelte';
+    import { page } from '$app/state';
     import { getContext } from 'svelte';
-    import { t, type Locale } from '#lib/i18n/index.js';
+    import { siteHref, t, type Locale } from '#lib/i18n/index.js';
 
     interface Props {
         posts: ListingPost[];
@@ -24,7 +25,9 @@
 >
     {#snippet button()}
         <div>
-            <Button href="/blog">{t(locale, 'recentPosts.viewMore')}</Button>
+            <Button href={siteHref('/blog', page.url.origin)}
+                >{t(locale, 'recentPosts.viewMore')}</Button
+            >
         </div>
     {/snippet}
     <!-- Posts are written in English, also on the German home page. -->
diff --git a/src/lib/data/meta.ts b/src/lib/data/meta.ts
index 9fcefe24..542c37b4 100644
--- a/src/lib/data/meta.ts
+++ b/src/lib/data/meta.ts
@@ -3,7 +3,7 @@
 // Via <svelte:head>
 
 import MeSrc from '#lib/assets/images/authors/jloos.png?enhanced';
-import type { Author, BlogPost } from '#lib/utils/types.js';
+import type { Author } from '#lib/utils/types.js';
 import type {
     BlogPosting,
     BreadcrumbList,
@@ -23,6 +23,8 @@ export const description =
 
 export const title = 'Jan-Philip Loos | maxdaten.io';
 
+const portraitUrl = `${siteBaseUrl}${MeSrc?.img.src}`;
+
 /** The author bio lives in Sanity in English; this is its German translation. */
 const germanPersonDescription =
     'Jan-Philip Loos ist Freelance Platform & Product Engineer in Hamburg. Seit über 15 Jahren baut er Produkte und die Plattformen, auf denen sie laufen — von der Mitgründung der Briends GmbH, dem Unternehmen hinter Papego, bis zu Systemen mit 100M+ Requests am Tag. Er schreibt über Platform Engineering, Nix und Continuous Delivery.';
@@ -35,11 +37,10 @@ const organizationDescriptions: Record<Locale, string> = {
 export function getBaseSchema(
     locale: Locale,
     author: Author
-): [WebSite, Person, ProfilePage, Organization, ProfessionalService] {
+): [WebSite, Person, Organization, ProfessionalService] {
     // One name and URL per entity, whatever the page language: answer engines merge entities
     // by @id and distrust ones whose properties disagree.
     const entityName = 'maxdaten.io';
-    const portraitUrl = `${siteBaseUrl}${MeSrc?.img.src}`;
     const desc = {
         person: locale === 'de' ? germanPersonDescription : (author.bio ?? ''),
         organization: organizationDescriptions[locale],
@@ -73,17 +74,6 @@ export function getBaseSchema(
                     url.startsWith('https://') && !url.includes('signal.me')
             ),
         },
-        <WithContext<ProfilePage>>{
-            '@context': 'https://schema.org',
-            '@type': 'ProfilePage',
-            '@id': 'https://maxdaten.io/#profile',
-            url: canonicalUrl('/about/jloos'),
-            inLanguage: 'en-US',
-            mainEntity: {
-                '@id': 'https://maxdaten.io/#jloos',
-            },
-            image: portraitUrl,
-        },
         <WithContext<Organization>>{
             '@context': 'https://schema.org',
             '@type': 'Organization',
@@ -127,11 +117,41 @@ export function getBaseSchema(
     ];
 }
 
+/**
+ * The site author's about page is their ProfilePage. Only that page says so: on every other
+ * page it would claim the page itself is a profile.
+ */
+export function createProfilePageSchema(): WithContext<ProfilePage> {
+    return {
+        '@context': 'https://schema.org',
+        '@type': 'ProfilePage',
+        '@id': 'https://maxdaten.io/#profile',
+        url: canonicalUrl('/about/jloos'),
+        inLanguage: 'en-US',
+        mainEntity: {
+            '@id': 'https://maxdaten.io/#jloos',
+        },
+        image: portraitUrl,
+    };
+}
+
+/** What a BlogPosting needs to know about a post. */
+export type BlogPostingInput = {
+    title: string;
+    date: string;
+    updated: string;
+    excerpt: string;
+    tags: string[];
+    image: string;
+    wordCount?: number;
+    readingTimeMinutes?: number;
+    authorId?: string;
+};
+
 // Simple mapping function for blog posts (not a complex generator)
 export function createBlogPostingSchema(
-    post: BlogPost,
-    pageUrl: string,
-    image: string
+    post: BlogPostingInput,
+    pageUrl: string
 ): WithContext<BlogPosting> {
     return {
         '@context': 'https://schema.org',
@@ -143,7 +163,7 @@ export function createBlogPostingSchema(
         keywords: post.tags,
         url: pageUrl,
         mainEntityOfPage: pageUrl,
-        image,
+        image: post.image,
         inLanguage: 'en',
         ...(post.authorId && {
             author: {
@@ -153,8 +173,8 @@ export function createBlogPostingSchema(
         publisher: {
             '@id': 'https://maxdaten.io/#organization',
         },
+        ...(post.wordCount && { wordCount: post.wordCount }),
         ...(post.readingTimeMinutes && {
-            wordCount: post.readingTimeMinutes * 200, // estimate
             timeRequired: `PT${post.readingTimeMinutes}M`,
         }),
     };
diff --git a/src/lib/i18n/de.ts b/src/lib/i18n/de.ts
index f8595c0e..623ead61 100644
--- a/src/lib/i18n/de.ts
+++ b/src/lib/i18n/de.ts
@@ -6,7 +6,7 @@ export const de: TranslationKeys = {
     'hero.headline': 'Software, die liefert',
     'hero.headlineAccent': 'Systeme, die skalieren',
     'hero.subheadline':
-        'Ich entwickle Ihr digitales Produkt end-to-end und sorge dafür, dass das Wissen in Ihrem Team bleibt — mit Continuous Delivery und Hochverfügbarkeit als Grundlage.<br><br>Freelance Platform & Product Engineer mit 15+ Jahren Erfahrung in Produktentwicklung, Plattform-Architektur und Tech-Leadership — vom Startup bis zu Systemen mit 100M+ Requests am Tag. Hamburg.',
+        'Ich entwickle Ihr Produkt und die Plattform darunter — Kubernetes, Nix, Continuous Delivery. Hands-on in Ihrem Team, und das Wissen bleibt. Hamburg & remote.<br><br>Freelance Platform & Product Engineer mit 15+ Jahren Erfahrung in Produktentwicklung, Plattform-Architektur und Tech-Leadership — vom Startup bis zu Systemen mit 100M+ Requests am Tag.',
     'hero.ctaBook': 'Gespräch buchen',
     'hero.ctaProjects': 'Projekte ansehen',
     'hero.abilityDescription': 'Ausgerollt an 700+ Fielmann-Filialen',
@@ -57,9 +57,7 @@ export const de: TranslationKeys = {
         'Mitgründer des Unternehmens hinter Papego, ausgezeichnet mit dem German Design Award 2018.',
 
     // Meta / SEO
-    'meta.title': 'Jan-Philip Loos | maxdaten.de',
-    'meta.description':
-        'Ich entwickle Ihr digitales Produkt end-to-end und sorge dafür, dass das Wissen in Ihrem Team bleibt — mit Continuous Delivery und Hochverfügbarkeit als Grundlage. Freelance Platform & Product Engineer mit 15+ Jahren Erfahrung in Produktentwicklung, Plattform-Architektur und Tech-Leadership — vom Startup bis zu Systemen mit 100M+ Requests am Tag. Hamburg.',
+    'meta.title': 'Platform & Product Engineer, Hamburg | Jan-Philip Loos',
     'meta.ogImageAlt':
         'Jan-Philip Loos - Software, die liefert. Systeme, die skalieren.',
     'meta.keywords':
diff --git a/src/lib/i18n/en.ts b/src/lib/i18n/en.ts
index 0b48a797..62bd0e15 100644
--- a/src/lib/i18n/en.ts
+++ b/src/lib/i18n/en.ts
@@ -6,7 +6,7 @@ export const en: TranslationKeys = {
     'hero.headline': 'Products that ship',
     'hero.headlineAccent': 'Systems that scale',
     'hero.subheadline':
-        'I build your digital product end to end and make sure the knowledge stays in your team — with continuous delivery and high availability as the foundation.<br><br>Freelance Platform & Product Engineer with 15+ years in product development, platform architecture and tech leadership — from startup to systems at 100M+ requests a day. Hamburg.',
+        'I build your product and the platform under it: Kubernetes, Nix, continuous delivery. Hands-on in your team, and the knowledge stays. Hamburg & remote.<br><br>Freelance Platform & Product Engineer with 15+ years in product development, platform architecture and tech leadership — from startup to systems at 100M+ requests a day.',
     'hero.ctaBook': 'Book a Call',
     'hero.ctaProjects': 'View Projects',
     'hero.abilityDescription': 'Deployed to 700+ retail locations at Fielmann',
@@ -57,9 +57,7 @@ export const en: TranslationKeys = {
         'Co-founded the company behind Papego, winner of the German Design Award 2018.',
 
     // Meta / SEO
-    'meta.title': 'Jan-Philip Loos | maxdaten.io',
-    'meta.description':
-        'I build your digital product end to end and make sure the knowledge stays in your team — with continuous delivery and high availability as the foundation. Freelance Platform & Product Engineer with 15+ years in product development, platform architecture and tech leadership — from startup to systems at 100M+ requests a day. Hamburg.',
+    'meta.title': 'Platform & Product Engineer, Hamburg | Jan-Philip Loos',
     'meta.ogImageAlt':
         'Jan-Philip Loos - Products that ship. Systems that scale.',
     'meta.keywords':
diff --git a/src/lib/i18n/i18n.test.ts b/src/lib/i18n/i18n.test.ts
index 7e0035cf..79c5b063 100644
--- a/src/lib/i18n/i18n.test.ts
+++ b/src/lib/i18n/i18n.test.ts
@@ -6,6 +6,8 @@ import {
     canonicalUrl,
     heroSummary,
     homeHref,
+    siteHref,
+    isExternalHref,
     defaultLocale,
     supportedLocales,
 } from './index';
@@ -32,6 +34,8 @@ describe('i18n', () => {
                 // Service names German buyers use in English.
                 'services.platform.title',
                 'services.delivery.title',
+                // The job title and place, in the English German buyers search for.
+                'meta.title',
             ]);
 
             for (const key of Object.keys(de) as (keyof TranslationKeys)[]) {
@@ -137,6 +141,9 @@ describe('i18n', () => {
             ['https://maxdaten.de', 'en', 'https://www.maxdaten.io/en'],
             ['https://www.maxdaten.io', 'de', 'https://maxdaten.de/'],
             ['https://www.maxdaten.io', 'en', 'https://www.maxdaten.io/en'],
+            // The prerender origin may be a redirecting host.
+            ['https://maxdaten.io', 'en', 'https://www.maxdaten.io/en'],
+            ['https://maxdaten.io', 'de', 'https://maxdaten.de/'],
         ] as const)(
             'links across production domains (%s → %s)',
             (origin, locale, expected) => {
@@ -156,6 +163,45 @@ describe('i18n', () => {
         );
     });
 
+    describe('siteHref()', () => {
+        it.each([
+            ['https://maxdaten.de', '/blog', 'https://www.maxdaten.io/blog'],
+            [
+                'https://maxdaten.de',
+                '/a-post',
+                'https://www.maxdaten.io/a-post',
+            ],
+            [
+                'https://www.maxdaten.io',
+                '/impressum',
+                'https://maxdaten.de/impressum',
+            ],
+            ['https://maxdaten.io', '/gems', 'https://www.maxdaten.io/gems'],
+        ] as const)(
+            'links to the final URL in production (%s, %s)',
+            (origin, path, expected) => {
+                expect(siteHref(path, origin)).toBe(expected);
+            }
+        );
+
+        it('stays on the current host elsewhere', () => {
+            expect(siteHref('/blog', 'http://localhost:5173')).toBe('/blog');
+        });
+    });
+
+    describe('isExternalHref()', () => {
+        it.each([
+            ['https://github.com/MaxDaten', true],
+            ['http://localhost:5173/blog', true],
+            ['https://www.maxdaten.io/blog', false],
+            ['https://maxdaten.de/impressum', false],
+            ['/blog', false],
+            ['mailto:jloos@maxdaten.com', false],
+        ] as const)('%s → %s', (href, expected) => {
+            expect(isExternalHref(href)).toBe(expected);
+        });
+    });
+
     describe('constants', () => {
         it('has "de" as defaultLocale', () => {
             expect(defaultLocale).toBe('de');
diff --git a/src/lib/i18n/index.ts b/src/lib/i18n/index.ts
index 3d83eb8a..de817385 100644
--- a/src/lib/i18n/index.ts
+++ b/src/lib/i18n/index.ts
@@ -54,14 +54,37 @@ export function canonicalUrl(pathname: string): string {
     return new URL(pathname, getSiteBaseUrl(getLocaleFromPath(pathname))).href;
 }
 
-const homePaths: Record<Locale, string> = { de: '/', en: '/en' };
+/** Hosts the site is served from in production, including the redirecting ones. */
+const productionHosts = new Set([
+    'maxdaten.de',
+    'www.maxdaten.de',
+    'maxdaten.io',
+    'www.maxdaten.io',
+]);
+
+function isProductionOrigin(origin: string): boolean {
+    return productionHosts.has(new URL(origin).hostname);
+}
+
+/** An absolute link to another site; siteHref() links to this site's own hosts are internal. */
+export function isExternalHref(href: string): boolean {
+    return /^https?:\/\//.test(href) && !isProductionOrigin(href);
+}
 
 /**
- * Link to a locale's home page. On the production domains the locales live on different hosts,
- * so the link crosses domains; anywhere else (localhost, preview deployments) it stays on the
- * current host.
+ * Link to a page of this site. On the production domains it is the page's final URL, so a link
+ * from a German page to an English one (or the reverse) crosses domains instead of bouncing
+ * through a redirect; anywhere else (localhost, preview deployments) it stays on the current host.
  */
+export function siteHref(pathname: string, currentOrigin: string): string {
+    return isProductionOrigin(currentOrigin)
+        ? canonicalUrl(pathname)
+        : pathname;
+}
+
+const homePaths: Record<Locale, string> = { de: '/', en: '/en' };
+
+/** Link to a locale's home page; see siteHref(). */
 export function homeHref(locale: Locale, currentOrigin: string): string {
-    const onProduction = Object.values(localeDomains).includes(currentOrigin);
-    return onProduction ? canonicalUrl(homePaths[locale]) : homePaths[locale];
+    return siteHref(homePaths[locale], currentOrigin);
 }
diff --git a/src/lib/i18n/types.ts b/src/lib/i18n/types.ts
index ab53f066..4399b6d4 100644
--- a/src/lib/i18n/types.ts
+++ b/src/lib/i18n/types.ts
@@ -50,7 +50,6 @@ export interface TranslationKeys {
 
     // Meta / SEO
     'meta.title': string;
-    'meta.description': string;
     'meta.ogImageAlt': string;
     'meta.keywords': string;
 }
diff --git a/src/lib/sanity/author.ts b/src/lib/sanity/author.ts
index 0d061d15..5afc3ecf 100644
--- a/src/lib/sanity/author.ts
+++ b/src/lib/sanity/author.ts
@@ -2,8 +2,7 @@ import { client } from '#lib/sanity/client.js';
 import { authorBySlugQuery, authorSlugsQuery } from '#lib/sanity/queries.js';
 import type { Author } from '#lib/utils/types.js';
 
-/** The site's own author: the JSON-LD Person, the footer links and llms.txt. */
-export const SITE_AUTHOR = 'jloos';
+export { SITE_AUTHOR } from './site-author.js';
 
 type SanityAuthor = {
     slug: string;
diff --git a/src/lib/sanity/heading-anchors.test.ts b/src/lib/sanity/heading-anchors.test.ts
new file mode 100644
index 00000000..32e590ac
--- /dev/null
+++ b/src/lib/sanity/heading-anchors.test.ts
@@ -0,0 +1,55 @@
+import { describe, expect, it } from 'vitest';
+import { assignHeadingAnchors, headingSlug } from './heading-anchors.js';
+
+const heading = (text: string, style = 'h2') => ({
+    _type: 'block',
+    _key: text,
+    style,
+    markDefs: [],
+    children: [{ _type: 'span', _key: 's', text, marks: [] }],
+});
+
+describe('headingSlug', () => {
+    it.each([
+        [
+            'OpenSSL: Version Drift in the Fields',
+            'openssl-version-drift-in-the-fields',
+        ],
+        ["What's in a name?", 'whats-in-a-name'],
+        ['Übersicht für Größen', 'ubersicht-fur-grossen'],
+        ['  Spaces  around  ', 'spaces-around'],
+    ])('%s → %s', (text, slug) => {
+        expect(headingSlug(text)).toBe(slug);
+    });
+});
+
+describe('assignHeadingAnchors', () => {
+    it('numbers repeated headings', () => {
+        const body = assignHeadingAnchors([
+            heading('Setup'),
+            heading('Usage'),
+            heading('Setup', 'h3'),
+            heading('Setup'),
+        ]);
+        expect(body.map((b) => (b as { _anchor?: string })._anchor)).toEqual([
+            'setup',
+            'usage',
+            'setup-2',
+            'setup-3',
+        ]);
+    });
+
+    it('leaves paragraphs and other blocks alone', () => {
+        const paragraph = heading('Text', 'normal');
+        const code = { _type: 'codeBlock', _key: 'c' };
+        expect(assignHeadingAnchors([paragraph, code])).toEqual([
+            paragraph,
+            code,
+        ]);
+    });
+
+    it('falls back when a heading has no letters to slug', () => {
+        const [block] = assignHeadingAnchors([heading('🚀')]);
+        expect((block as { _anchor?: string })._anchor).toBe('section');
+    });
+});
diff --git a/src/lib/sanity/heading-anchors.ts b/src/lib/sanity/heading-anchors.ts
new file mode 100644
index 00000000..cca8bb56
--- /dev/null
+++ b/src/lib/sanity/heading-anchors.ts
@@ -0,0 +1,41 @@
+const headingStyles = new Set(['h1', 'h2', 'h3', 'h4', 'h5', 'h6']);
+
+/**
+ * URL fragment for a heading: lowercase ASCII words joined by dashes. Accented letters keep
+ * their base letter ("Übersicht" → "ubersicht") instead of vanishing.
+ */
+export function headingSlug(text: string): string {
+    return text
+        .normalize('NFKD')
+        .replace(/\p{M}/gu, '')
+        .replace(/ß/g, 'ss')
+        .toLowerCase()
+        .replace(/[^a-z0-9\s-]/g, '')
+        .trim()
+        .replace(/\s+/g, '-')
+        .replace(/-+/g, '-');
+}
+
+type Block = { _type: string; style?: string; children?: unknown };
+
+function blockText(block: Block): string {
+    const children = (block.children ?? []) as Array<{ text?: string }>;
+    return children.map((child) => child.text ?? '').join('');
+}
+
+/**
+ * Give each top-level heading a unique `_anchor`. Repeated headings get -2, -3, … like GitHub,
+ * so every id on the page is unique and each link lands on its own heading.
+ */
+export function assignHeadingAnchors<T extends Block>(body: T[]): T[] {
+    const seen = new Map<string, number>();
+    return body.map((block) => {
+        if (block._type !== 'block' || !headingStyles.has(block.style ?? '')) {
+            return block;
+        }
+        const base = headingSlug(blockText(block)) || 'section';
+        const count = (seen.get(base) ?? 0) + 1;
+        seen.set(base, count);
+        return { ...block, _anchor: count === 1 ? base : `${base}-${count}` };
+    });
+}
diff --git a/src/lib/sanity/internal-link.test.ts b/src/lib/sanity/internal-link.test.ts
new file mode 100644
index 00000000..6d2b31dc
--- /dev/null
+++ b/src/lib/sanity/internal-link.test.ts
@@ -0,0 +1,21 @@
+import { describe, expect, it } from 'vitest';
+import { internalLinkPath } from './internal-link.js';
+
+describe('internalLinkPath', () => {
+    it('links a post to its page', () => {
+        expect(
+            internalLinkPath({ _type: 'post', slug: { current: 'a-post' } })
+        ).toBe('/a-post');
+    });
+
+    it('links a gem to its card on /gems', () => {
+        expect(
+            internalLinkPath({ _type: 'gem', slug: { current: 'a-gem' } })
+        ).toBe('/gems#a-gem');
+    });
+
+    it('has no path for a missing reference', () => {
+        expect(internalLinkPath(undefined)).toBeUndefined();
+        expect(internalLinkPath({ _type: 'post' })).toBeUndefined();
+    });
+});
diff --git a/src/lib/sanity/internal-link.ts b/src/lib/sanity/internal-link.ts
new file mode 100644
index 00000000..146e50fd
--- /dev/null
+++ b/src/lib/sanity/internal-link.ts
@@ -0,0 +1,17 @@
+/** The target of an internalLink mark, as the post query dereferences it. */
+export type InternalLinkReference = {
+    _type: string;
+    slug?: { current?: string };
+};
+
+/**
+ * Site path of an internal link: a post's own page, or a gem's card on /gems (gems have no page
+ * of their own). Undefined when the reference is missing or unpublished.
+ */
+export function internalLinkPath(
+    reference: InternalLinkReference | undefined
+): string | undefined {
+    const slug = reference?.slug?.current;
+    if (!slug) return undefined;
+    return reference._type === 'gem' ? `/gems#${slug}` : `/${slug}`;
+}
diff --git a/src/lib/sanity/portable-text/Heading.svelte b/src/lib/sanity/portable-text/Heading.svelte
index 70f088dd..9a8ab4da 100644
--- a/src/lib/sanity/portable-text/Heading.svelte
+++ b/src/lib/sanity/portable-text/Heading.svelte
@@ -1,6 +1,7 @@
 <script lang="ts">
     import type { BlockComponentProps } from '@portabletext/svelte';
     import type { Snippet } from 'svelte';
+    import { headingSlug } from '#lib/sanity/heading-anchors.js';
 
     interface Props {
         portableText: BlockComponentProps;
@@ -13,26 +14,17 @@
     // Extract heading level from style (h1, h2, h3, etc.)
     let level = $derived((value.style as string) || 'h2');
 
-    // Generate slug from text content for anchor
-    function generateSlug(text: string): string {
-        return text
-            .toLowerCase()
-            .replace(/[^a-z0-9\s-]/g, '')
-            .replace(/\s+/g, '-')
-            .replace(/-+/g, '-')
-            .trim();
-    }
-
-    // Extract text from children for slug generation
-    let headingText = $derived.by(() => {
-        // Get text from portable text children
+    // Unique per page, assigned by the post load; headings nested in other blocks fall back
+    // to their own text.
+    let slug = $derived.by(() => {
+        const anchor = (value as { _anchor?: unknown })._anchor;
+        if (typeof anchor === 'string') return anchor;
         const children = value.children as Array<{ text?: string }> | undefined;
-        if (!children) return '';
-        return children.map((child) => child.text || '').join('');
+        return headingSlug(
+            children?.map((child) => child.text || '').join('') ?? ''
+        );
     });
 
-    let slug = $derived(generateSlug(headingText));
-
     // Copy anchor URL to clipboard
     async function copyAnchorUrl() {
         const url = `${window.location.origin}${window.location.pathname}#${slug}`;
diff --git a/src/lib/sanity/portable-text/InternalLink.svelte b/src/lib/sanity/portable-text/InternalLink.svelte
index 3544e9c8..7a2b4f00 100644
--- a/src/lib/sanity/portable-text/InternalLink.svelte
+++ b/src/lib/sanity/portable-text/InternalLink.svelte
@@ -1,12 +1,13 @@
 <script lang="ts">
     import type { MarkComponentProps } from '@portabletext/svelte';
     import type { Snippet } from 'svelte';
+    import {
+        internalLinkPath,
+        type InternalLinkReference,
+    } from '#lib/sanity/internal-link.js';
 
     interface InternalLinkValue {
-        reference?: {
-            _type: 'post' | 'gem';
-            slug: { current: string };
-        };
+        reference?: InternalLinkReference;
     }
 
     interface Props {
@@ -17,16 +18,11 @@
     let { portableText, children }: Props = $props();
     let value = $derived(portableText.value);
 
-    // Resolve reference to URL at render time
-    let href = $derived.by(() => {
-        if (!value.reference) return '#';
-        const { _type, slug } = value.reference;
-        return _type === 'post' ? `/${slug.current}` : `/gems#${slug.current}`;
-    });
+    let href = $derived(internalLinkPath(value.reference));
 </script>
 
 <!-- eslint-disable svelte/no-navigation-without-resolve -- Portable text internal link -->
-{#if value.reference}
+{#if href}
     <a {href}>
         {@render children()}
     </a>
diff --git a/src/lib/sanity/portable-text/PortableImage.svelte b/src/lib/sanity/portable-text/PortableImage.svelte
index 9fca70b0..9b618f30 100644
--- a/src/lib/sanity/portable-text/PortableImage.svelte
+++ b/src/lib/sanity/portable-text/PortableImage.svelte
@@ -10,26 +10,36 @@
         };
         alt: string;
         caption?: string;
+        /** Projected by the post query from the asset's metadata. */
+        dimensions?: { width: number; height: number };
+        lqip?: string | null;
     }
 
     interface Props {
         portableText: CustomBlockComponentProps<ImageValue>;
-        lqip?: string;
     }
 
-    let { portableText, lqip }: Props = $props();
+    let { portableText }: Props = $props();
     let value = $derived(portableText.value);
 
     // Generate responsive srcset and default src
     let srcset = $derived(generateSrcSet(value.image));
     let src = $derived(urlFor(value.image).width(1280).auto('format').url());
 
-    // Style object for LQIP placeholder
-    let placeholderStyle = $derived(
-        lqip
-            ? `background-image: url(${lqip}); background-size: cover;`
-            : undefined
-    );
+    // Intrinsic size of the rendered (cropped) image, so the browser reserves its box before it loads.
+    let size = $derived.by(() => {
+        if (!value.dimensions) return undefined;
+        const { width, height } = value.dimensions;
+        const crop = value.image.crop;
+        return {
+            width: Math.round(
+                width * (1 - (crop?.left ?? 0) - (crop?.right ?? 0))
+            ),
+            height: Math.round(
+                height * (1 - (crop?.top ?? 0) - (crop?.bottom ?? 0))
+            ),
+        };
+    });
 </script>
 
 <figure class="portable-image">
@@ -38,8 +48,12 @@
         {srcset}
         sizes="(max-width: 640px) 100vw, (max-width: 1280px) 80vw, 1280px"
         alt={value.alt}
+        width={size?.width}
+        height={size?.height}
         loading="lazy"
-        style={placeholderStyle}
+        decoding="async"
+        style:background-image={value.lqip ? `url(${value.lqip})` : undefined}
+        style:background-size={value.lqip ? 'cover' : undefined}
     />
     {#if value.caption}
         <figcaption>{value.caption}</figcaption>
diff --git a/src/lib/sanity/post-dates.test.ts b/src/lib/sanity/post-dates.test.ts
new file mode 100644
index 00000000..2e07885f
--- /dev/null
+++ b/src/lib/sanity/post-dates.test.ts
@@ -0,0 +1,24 @@
+import { describe, expect, it } from 'vitest';
+import { postModifiedAt } from './post-dates.js';
+
+describe('postModifiedAt', () => {
+    const date = '2026-01-31T12:00:00.000Z';
+    const _updatedAt = '2026-02-04T18:44:11Z';
+    const lastModified = '2026-03-01T00:00:00.000Z';
+
+    it('prefers the editor-set lastModified', () => {
+        expect(postModifiedAt({ date, _updatedAt, lastModified })).toBe(
+            lastModified
+        );
+    });
+
+    it('falls back to the last document edit', () => {
+        expect(postModifiedAt({ date, _updatedAt, lastModified: null })).toBe(
+            _updatedAt
+        );
+    });
+
+    it('falls back to the publish date', () => {
+        expect(postModifiedAt({ date })).toBe(date);
+    });
+});
diff --git a/src/lib/sanity/post-dates.ts b/src/lib/sanity/post-dates.ts
new file mode 100644
index 00000000..5582f2a4
--- /dev/null
+++ b/src/lib/sanity/post-dates.ts
@@ -0,0 +1,13 @@
+type PostDates = {
+    date: string;
+    lastModified?: string | null;
+    _updatedAt?: string | null;
+};
+
+/**
+ * When a post last changed, for machines (sitemap lastmod, JSON-LD dateModified). Editors rarely
+ * set lastModified (shown on the page as "Updated"), so fall back to the document's last edit.
+ */
+export function postModifiedAt(post: PostDates): string {
+    return post.lastModified ?? post._updatedAt ?? post.date;
+}
diff --git a/src/lib/sanity/queries.ts b/src/lib/sanity/queries.ts
index fc596e75..e4eab504 100644
--- a/src/lib/sanity/queries.ts
+++ b/src/lib/sanity/queries.ts
@@ -21,6 +21,11 @@ export const postBySlugQuery = defineQuery(`
             slug
           }
         }
+      },
+      _type == "portableImage" => {
+        "dimensions": image.asset->metadata.dimensions,
+        // A blurred placeholder would show through transparent images.
+        "lqip": select(image.asset->metadata.hasAlpha => null, image.asset->metadata.lqip)
       }
     },
     date,
@@ -29,6 +34,12 @@ export const postBySlugQuery = defineQuery(`
     hidden,
     keywords,
     outroText,
+    seo {
+      metaTitle,
+      metaDescription,
+      noIndex,
+      ogImage
+    },
     author-> {
       "id": slug.current,
       name,
@@ -84,17 +95,31 @@ export const allPostsQuery = defineQuery(`
 `);
 
 /**
- * GROQ query for fetching all posts for RSS feed.
- * Includes full body for HTML rendering.
+ * GROQ query for the sitemap: listed posts that editors haven't marked "No Index".
+ */
+export const sitemapPostsQuery = defineQuery(`
+  *[_type == "post" && !hidden && seo.noIndex != true] | order(date desc) {
+    "slug": slug.current,
+    lastModified,
+    _updatedAt,
+    date
+  }
+`);
+
+/**
+ * GROQ query for fetching all posts for RSS feed (and llms.txt).
+ * Includes full body for HTML rendering. Leaves out hidden and "No Index" posts.
  * Sorted by date descending.
  */
 export const rssPostsQuery = defineQuery(`
-  *[_type == "post" && !hidden] | order(date desc) {
+  *[_type == "post" && !hidden && seo.noIndex != true] | order(date desc) {
     _id,
     title,
     "slug": slug.current,
     excerpt,
     date,
+    lastModified,
+    _updatedAt,
     body[]{
       ...,
       markDefs[]{
diff --git a/src/lib/sanity/reading-time.ts b/src/lib/sanity/reading-time.ts
index a258b7cc..a18a79e9 100644
--- a/src/lib/sanity/reading-time.ts
+++ b/src/lib/sanity/reading-time.ts
@@ -29,6 +29,11 @@ function extractText(blocks: PortableTextBlock[]): string {
         .join(' ');
 }
 
+/** Number of words in the prose of Portable Text blocks (not code or images). */
+export function countWords(blocks: PortableTextBlock[]): number {
+    return extractText(blocks).trim().split(/\s+/).filter(Boolean).length;
+}
+
 /**
  * Calculate reading time in minutes from Portable Text blocks.
  * Uses 200 words per minute as the average reading speed.
@@ -36,12 +41,7 @@ function extractText(blocks: PortableTextBlock[]): string {
 export function calculateReadingTime(
     blocks: PortableTextBlock[]
 ): number | undefined {
-    const text = extractText(blocks);
-    if (!text) {
-        return undefined;
-    }
-
-    const wordCount = text.trim().split(/\s+/).filter(Boolean).length;
+    const wordCount = countWords(blocks);
     const minutes = Math.ceil(wordCount / WORDS_PER_MINUTE);
 
     return minutes > 0 ? minutes : undefined;
diff --git a/src/lib/sanity/site-author.ts b/src/lib/sanity/site-author.ts
new file mode 100644
index 00000000..5d5c27a1
--- /dev/null
+++ b/src/lib/sanity/site-author.ts
@@ -0,0 +1,5 @@
+/**
+ * The site's own author: the JSON-LD Person, the footer links and llms.txt. Its own module so
+ * universal load functions can use it without bundling the Sanity client.
+ */
+export const SITE_AUTHOR = 'jloos';
diff --git a/src/lib/server/llms.test.ts b/src/lib/server/llms.test.ts
index 4f7efcb6..2791731c 100644
--- a/src/lib/server/llms.test.ts
+++ b/src/lib/server/llms.test.ts
@@ -1,5 +1,5 @@
 import { describe, expect, it } from 'vitest';
-import { t } from '#lib/i18n/index.js';
+import { heroSummary } from '#lib/i18n/index.js';
 import { renderLlmsFullTxt, renderLlmsTxt, type LlmsPost } from './llms';
 import type { Author } from '#lib/utils/types.js';
 
@@ -79,7 +79,7 @@ describe('llms.txt', () => {
         expect(txt.split('\n').slice(0, 3)).toEqual([
             '# Jan-Philip Loos',
             '',
-            `> ${t('en', 'meta.description')}`,
+            `> ${heroSummary('en')}`,
         ]);
     });
 
diff --git a/src/lib/server/llms.ts b/src/lib/server/llms.ts
index ede5840d..a1cd4b81 100644
--- a/src/lib/server/llms.ts
+++ b/src/lib/server/llms.ts
@@ -9,7 +9,8 @@ import {
 } from '@portabletext/markdown';
 import type { ArbitraryTypedObject } from '@portabletext/types';
 import type { Author } from '#lib/utils/types.js';
-import { canonicalUrl, localeDomains, t } from '#lib/i18n/index.js';
+import { canonicalUrl, heroSummary, localeDomains } from '#lib/i18n/index.js';
+import { internalLinkPath } from '#lib/sanity/internal-link.js';
 
 export type LlmsPost = {
     title: string;
@@ -36,10 +37,8 @@ const renderers: Partial<PortableTextRenderers> = {
     },
     marks: {
         internalLink: ({ children, value }) => {
-            const slug = value?.reference?.slug?.current;
-            return slug
-                ? `[${children}](${canonicalUrl(`/${slug}`)})`
-                : children;
+            const path = internalLinkPath(value?.reference);
+            return path ? `[${children}](${canonicalUrl(path)})` : children;
         },
     },
 };
@@ -54,7 +53,7 @@ function header(author: Author): string {
     return [
         `# ${author.name}`,
         '',
-        `> ${t('en', 'meta.description')}`,
+        `> ${heroSummary('en')}`,
         '',
         author.bio,
         '',
diff --git a/src/lib/utils/regex.test.ts b/src/lib/utils/regex.test.ts
deleted file mode 100644
index f50b1126..00000000
--- a/src/lib/utils/regex.test.ts
+++ /dev/null
@@ -1,30 +0,0 @@
-import { expect, test, describe } from 'vitest';
-import { HttpRegex } from './regex';
-
-describe('HTTP Regex', () => {
-    test('validates URLs starting with http or https', () => {
-        const validUrls = [
-            'https://example.com',
-            'http://localhost:3000',
-            'https://sub.domain.com/path?query=value',
-            'http://example.com',
-        ];
-
-        validUrls.forEach((url) => {
-            expect(HttpRegex.test(url)).toBe(true);
-        });
-    });
-
-    test('rejects URLs not starting with http or https', () => {
-        const invalidUrls = [
-            'ftp://example.com',
-            'example.com',
-            'www.example.com',
-            'mailto:test@example.com',
-        ];
-
-        invalidUrls.forEach((url) => {
-            expect(HttpRegex.test(url)).toBe(false);
-        });
-    });
-});
diff --git a/src/lib/utils/regex.ts b/src/lib/utils/regex.ts
deleted file mode 100644
index 8397cd0c..00000000
--- a/src/lib/utils/regex.ts
+++ /dev/null
@@ -1 +0,0 @@
-export const HttpRegex = /^((http|https):\/\/)/;
diff --git a/src/lib/utils/types.ts b/src/lib/utils/types.ts
index d8fd23a1..5cfcd415 100644
--- a/src/lib/utils/types.ts
+++ b/src/lib/utils/types.ts
@@ -1,5 +1,5 @@
-import type { Component } from 'svelte';
 import type { PortableTextBlock } from '@portabletext/types';
+import type { SanityImageSource } from '@sanity/image-url';
 
 export type SparkleType = {
     id: string;
@@ -39,21 +39,6 @@ export type Author = {
     };
 };
 
-export type BlogPost = {
-    tags: string[];
-    keywords: string[];
-    hidden: boolean;
-    slug: string;
-    title: string;
-    date: string;
-    updated: string;
-    excerpt: string;
-    readingTimeMinutes: number | undefined;
-    relatedPosts: BlogPost[];
-    content: Component;
-    authorId?: string;
-};
-
 export type GemEntry = {
     title: string;
     description: string;
@@ -77,6 +62,13 @@ export type SanityPost = {
     hidden?: boolean;
     keywords?: string[];
     outroText?: string;
+    /** Editor overrides from the studio's SEO group. */
+    seo?: {
+        metaTitle?: string;
+        metaDescription?: string;
+        noIndex?: boolean;
+        ogImage?: SanityImageSource;
+    };
     author?: {
         id?: string;
         name: string;
diff --git a/src/routes/(de)/+page.server.ts b/src/routes/(de)/+page.server.ts
index a0452b31..7f90e344 100644
--- a/src/routes/(de)/+page.server.ts
+++ b/src/routes/(de)/+page.server.ts
@@ -1,5 +1,10 @@
 import { getListingPosts } from '#lib/sanity/listing.js';
+import { t } from '#lib/i18n/index.js';
 
 export async function load() {
-    return { posts: await getListingPosts(4) };
+    return {
+        posts: await getListingPosts(4),
+        // The home page's title names the offer and stands alone, without the site-name suffix.
+        pageMetaTags: { title: t('de', 'meta.title'), titleTemplate: '%s' },
+    };
 }
diff --git a/src/routes/+error.svelte b/src/routes/+error.svelte
index 5766ebed..1ba183aa 100644
--- a/src/routes/+error.svelte
+++ b/src/routes/+error.svelte
@@ -1,5 +1,6 @@
 <script lang="ts">
     import { page } from '$app/state';
+    import { homeHref } from '#lib/i18n/index.js';
     import Button from '#lib/components/atoms/Button.svelte';
     import Error from '#lib/icons/error.svelte';
 
@@ -22,7 +23,7 @@
             {/if}
         </p>
         <br />
-        <Button href="/">Start over</Button>
+        <Button href={homeHref('en', page.url.origin)}>Start over</Button>
     </div>
 </div>
 
diff --git a/src/routes/+layout.ts b/src/routes/+layout.ts
index a318a4b2..24fe7e2b 100644
--- a/src/routes/+layout.ts
+++ b/src/routes/+layout.ts
@@ -3,6 +3,7 @@ import { getBaseSchema } from '#lib/data/meta.js';
 import { version } from '$app/env';
 import {
     t,
+    heroSummary,
     getLocaleFromPath,
     isTranslatedRoute,
     localeDomains,
@@ -14,10 +15,11 @@ export const prerender = true;
 
 export const load = ({ url, data }) => {
     const locale: Locale = getLocaleFromPath(url.pathname);
-    const ogImageUrl = new URL(`/og/${locale}.jpg?v=${version}`, url.origin)
-        .href;
+    // The prerender origin may be a redirecting host; social cards fetch from the final one.
+    const ogImageUrl = `${localeDomains.en}/og/${locale}.jpg?v=${version}`;
 
-    const description = t(locale, 'meta.description');
+    // The hero's first paragraph, sized to what search results show (≤155 characters).
+    const description = heroSummary(locale);
     const title = t(locale, 'meta.title');
     const ogImageAlt = t(locale, 'meta.ogImageAlt');
     const ogLocale = locale === 'de' ? 'de_DE' : 'en_US';
@@ -58,6 +60,8 @@ export const load = ({ url, data }) => {
         description,
         keywords: t(locale, 'meta.keywords').split(', '),
         canonical: canonicalUrl,
+        // Lets search show the large OG and cover images in results and Discover.
+        additionalRobotsProps: { maxImagePreview: 'large' as const },
         additionalLinkTags: [rssLinkTag, ...hreflangLinkTags],
         openGraph: {
             type: 'website',
diff --git a/src/routes/404/+page.svelte b/src/routes/404/+page.svelte
index b39b0378..650127d2 100644
--- a/src/routes/404/+page.svelte
+++ b/src/routes/404/+page.svelte
@@ -1,4 +1,6 @@
 <script>
+    import { page } from '$app/state';
+    import { homeHref } from '#lib/i18n/index.js';
     import Button from '#lib/components/atoms/Button.svelte';
     import Error from '#lib/icons/error.svelte';
     import { PageTransition } from 'ssgoi';
@@ -16,7 +18,7 @@
                 can't be displayed.
             </p>
             <br />
-            <Button href="/">Start over</Button>
+            <Button href={homeHref('en', page.url.origin)}>Start over</Button>
         </div>
     </div>
 </PageTransition>
diff --git a/src/routes/404/+page.ts b/src/routes/404/+page.ts
new file mode 100644
index 00000000..ab204298
--- /dev/null
+++ b/src/routes/404/+page.ts
@@ -0,0 +1,4 @@
+// A prerendered page that exists only to be shown for missing URLs: never a search result.
+export const load = () => ({
+    pageMetaTags: Object.freeze({ robots: 'noindex,follow' }),
+});
diff --git a/src/routes/[slug]/+page.server.ts b/src/routes/[slug]/+page.server.ts
index f5870274..5a2c60ac 100644
--- a/src/routes/[slug]/+page.server.ts
+++ b/src/routes/[slug]/+page.server.ts
@@ -3,6 +3,7 @@ import { client } from '#lib/sanity/client.js';
 import { postBySlugQuery, allPostSlugsQuery } from '#lib/sanity/queries.js';
 import { error } from '@sveltejs/kit';
 import { highlightCodeBlocks } from '#lib/server/highlight.js';
+import { assignHeadingAnchors } from '#lib/sanity/heading-anchors.js';
 
 export async function entries() {
     const posts = await client.fetch(allPostSlugsQuery);
@@ -20,6 +21,9 @@ export const load: PageServerLoad = async ({ params }) => {
 
     return {
         source: 'sanity' as const,
-        post: { ...post, body: await highlightCodeBlocks(post.body) },
+        post: {
+            ...post,
+            body: assignHeadingAnchors(await highlightCodeBlocks(post.body)),
+        },
     };
 };
diff --git a/src/routes/[slug]/+page.ts b/src/routes/[slug]/+page.ts
index 7d3884fc..f5394928 100644
--- a/src/routes/[slug]/+page.ts
+++ b/src/routes/[slug]/+page.ts
@@ -4,8 +4,12 @@ import type { MetaTagsProps, Twitter } from 'svelte-meta-tags';
 import { createBlogPostingSchema } from '#lib/data/meta.js';
 import type { BlogPosting, BreadcrumbList, WithContext } from 'schema-dts';
 import { version } from '$app/env';
-import { canonicalUrl } from '#lib/i18n/index.js';
+import { canonicalUrl, localeDomains } from '#lib/i18n/index.js';
 import { createBreadcrumbSchema } from '#lib/data/meta.js';
+import { urlFor } from '#lib/sanity/image.js';
+import { postModifiedAt } from '#lib/sanity/post-dates.js';
+import { SITE_AUTHOR } from '#lib/sanity/site-author.js';
+import { calculateReadingTime, countWords } from '#lib/sanity/reading-time.js';
 
 type PageData = PostData & {
     pageMetaTags: MetaTagsProps;
@@ -15,10 +19,21 @@ type PageData = PostData & {
 export const load: PageLoad = async ({ data, url }): Promise<PageData> => {
     const serverData = data as PostData;
     const post = serverData.post as SanityPost;
-    const ogImageUrl = new URL(
-        `${url.pathname}/og.jpg?v=${version}`,
-        url.origin
-    ).href;
+    // Editors can override title, description and social image in the studio's SEO group.
+    const seo = post.seo ?? {};
+    const metaTitle = seo.metaTitle || post.title;
+    const metaDescription = seo.metaDescription || post.excerpt || '';
+    const ogImageUrl = seo.ogImage
+        ? urlFor(seo.ogImage).width(1200).height(630).format('jpg').url()
+        : `${localeDomains.en}${url.pathname}/og.jpg?v=${version}`;
+    // Hidden posts are unlisted, not private: reachable by link, but kept out of search.
+    const noIndex = (post.hidden ?? false) || (seo.noIndex ?? false);
+
+    const pageUrl = canonicalUrl(url.pathname);
+    const authorId = post.author?.id ?? SITE_AUTHOR;
+    const publishedTime = post.date;
+    const modifiedTime = postModifiedAt(post);
+    const tags = post.tags?.map((t) => t.name) ?? [];
 
     // Build schema with Sanity post data
     const pageSchema = post.author
@@ -26,41 +41,45 @@ export const load: PageLoad = async ({ data, url }): Promise<PageData> => {
               createBlogPostingSchema(
                   {
                       title: post.title,
-                      slug: post.slug,
-                      date: post.date,
-                      // Editors rarely set lastModified (shown on the page as "Updated");
-                      // for machines, fall back to the document's last edit.
-                      updated:
-                          post.lastModified ?? post._updatedAt ?? post.date,
-                      excerpt: post.excerpt ?? '',
-                      tags: post.tags?.map((t) => t.name) ?? [],
-                      keywords: post.keywords ?? [],
-                      hidden: post.hidden ?? false,
-                      readingTimeMinutes: undefined,
-                      relatedPosts: [],
-                      content: undefined as unknown as never,
-                      authorId: 'jloos', // TODO: map from Sanity author
+                      date: publishedTime,
+                      updated: modifiedTime,
+                      excerpt: metaDescription,
+                      tags,
+                      // A social-card-sized image, not the full-resolution upload.
+                      image:
+                          post.coverImage?.url && !seo.ogImage
+                              ? urlFor(post.coverImage).width(1200).url()
+                              : ogImageUrl,
+                      wordCount: countWords(post.body),
+                      readingTimeMinutes: calculateReadingTime(post.body),
+                      authorId,
                   },
-                  canonicalUrl(url.pathname),
-                  post.coverImage?.url ?? ogImageUrl
+                  pageUrl
               ),
               createBreadcrumbSchema([
                   ['Home', canonicalUrl('/en')],
                   ['Blog', canonicalUrl('/blog')],
-                  [post.title, canonicalUrl(url.pathname)],
+                  [post.title, pageUrl],
               ]),
           ]
         : [];
 
     const pageMetaTags = Object.freeze({
-        title: post.title,
-        description: post.excerpt ?? '',
-        canonical: canonicalUrl(url.pathname),
+        title: metaTitle,
+        description: metaDescription,
+        canonical: pageUrl,
+        ...(noIndex && { robots: 'noindex,follow' }),
         openGraph: {
-            title: post.title,
-            description: post.excerpt ?? '',
-            url: canonicalUrl(url.pathname),
+            title: metaTitle,
+            description: metaDescription,
+            url: pageUrl,
             type: 'article',
+            article: {
+                publishedTime,
+                modifiedTime,
+                authors: [canonicalUrl(`/about/${authorId}`)],
+                tags,
+            },
             images: [
                 {
                     url: ogImageUrl,
@@ -73,8 +92,8 @@ export const load: PageLoad = async ({ data, url }): Promise<PageData> => {
             ],
         },
         twitter: {
-            title: post.title,
-            description: post.excerpt ?? '',
+            title: metaTitle,
+            description: metaDescription,
             cardType: 'summary_large_image',
             image: ogImageUrl,
             imageAlt: post.title,
diff --git a/src/routes/about/[authorId]/+page.server.ts b/src/routes/about/[authorId]/+page.server.ts
index fe40a5aa..ae5a59bd 100644
--- a/src/routes/about/[authorId]/+page.server.ts
+++ b/src/routes/about/[authorId]/+page.server.ts
@@ -1,5 +1,6 @@
 import { error } from '@sveltejs/kit';
-import { getAuthor, getAuthorSlugs } from '#lib/sanity/author.js';
+import { getAuthor, getAuthorSlugs, SITE_AUTHOR } from '#lib/sanity/author.js';
+import { createProfilePageSchema } from '#lib/data/meta.js';
 import type { PageServerLoad } from './$types';
 
 export const prerender = true;
@@ -24,5 +25,7 @@ export const load: PageServerLoad = async ({ params }) => {
             title: `About ${author.name}`,
             description: author.bio,
         },
+        // The site author is the Person the base JSON-LD describes.
+        pageSchema: authorId === SITE_AUTHOR ? [createProfilePageSchema()] : [],
     };
 };
diff --git a/src/routes/en/+page.server.ts b/src/routes/en/+page.server.ts
index a0452b31..8646069f 100644
--- a/src/routes/en/+page.server.ts
+++ b/src/routes/en/+page.server.ts
@@ -1,5 +1,10 @@
 import { getListingPosts } from '#lib/sanity/listing.js';
+import { t } from '#lib/i18n/index.js';
 
 export async function load() {
-    return { posts: await getListingPosts(4) };
+    return {
+        posts: await getListingPosts(4),
+        // The home page's title names the offer and stands alone, without the site-name suffix.
+        pageMetaTags: { title: t('en', 'meta.title'), titleTemplate: '%s' },
+    };
 }
diff --git a/src/routes/gems/+page.server.ts b/src/routes/gems/+page.server.ts
index f2861163..dddc9dd9 100644
--- a/src/routes/gems/+page.server.ts
+++ b/src/routes/gems/+page.server.ts
@@ -1,5 +1,15 @@
+import type { MetaTagsProps } from 'svelte-meta-tags';
+import type { ItemList, WithContext } from 'schema-dts';
 import { client } from '#lib/sanity/client.js';
 import { allGemsQuery } from '#lib/sanity/queries.js';
+import { canonicalUrl } from '#lib/i18n/index.js';
+import { createBreadcrumbSchema } from '#lib/data/meta.js';
+
+const title = 'Gems of Precious Friends';
+const description =
+    'Projects and channels by friends of Jan-Philip Loos: tools, tutorials and videos worth your time.';
+
+type Gem = { title: string; url: string; description: string };
 
 export async function load({ setHeaders }) {
     setHeaders({
@@ -13,7 +23,44 @@ export async function load({ setHeaders }) {
     const day = new Date().getDay();
     const rotated = rotateArray(gems, day);
 
-    return { gems: rotated };
+    // Without its own tags, /gems inherited the English home page's title and description.
+    const pageMetaTags = Object.freeze({
+        title,
+        description,
+        openGraph: { title, description },
+        twitter: { title, description },
+    }) satisfies MetaTagsProps;
+
+    return {
+        gems: rotated,
+        pageMetaTags,
+        pageSchema: [
+            gemListSchema(gems),
+            createBreadcrumbSchema([
+                ['Home', canonicalUrl('/en')],
+                ['Gems', canonicalUrl('/gems')],
+            ]),
+        ],
+    };
+}
+
+/** The gems in a stable (alphabetical) order, unlike the rotated page. */
+function gemListSchema(gems: Gem[]): WithContext<ItemList> {
+    return {
+        '@context': 'https://schema.org',
+        '@type': 'ItemList',
+        name: title,
+        description,
+        url: canonicalUrl('/gems'),
+        numberOfItems: gems.length,
+        itemListElement: gems.map((gem, index) => ({
+            '@type': 'ListItem',
+            position: index + 1,
+            name: gem.title,
+            description: gem.description,
+            url: gem.url,
+        })),
+    };
 }
 
 function rotateArray<T>(arr: T[], count: number) {
diff --git a/src/routes/gems/+page.svelte b/src/routes/gems/+page.svelte
index 96eef913..af8f0adb 100644
--- a/src/routes/gems/+page.svelte
+++ b/src/routes/gems/+page.svelte
@@ -44,6 +44,7 @@
             <div class="grid">
                 {#each gems as gem, index (index)}
                     <GemCard
+                        id={gem.slug}
                         title={gem.title}
                         coverImage={gem.coverImage || ''}
                         excerpt={gem.description}
diff --git a/src/routes/robots.txt/+server.ts b/src/routes/robots.txt/+server.ts
index dc858b24..3413fe70 100644
--- a/src/routes/robots.txt/+server.ts
+++ b/src/routes/robots.txt/+server.ts
@@ -1,13 +1,31 @@
+import { localeDomains } from '#lib/i18n/index.js';
+
 export const prerender = true;
 
-export async function GET({ url }): Promise<Response> {
-    // prettier-ignore
+/**
+ * Answer engines' search crawlers and the fetchers that act for a user's question. The wildcard
+ * group already allows them; naming them keeps them allowed should the wildcard ever narrow.
+ * Training crawlers (GPTBot, ClaudeBot, Google-Extended, CCBot, …) fall under the wildcard.
+ */
+const answerEngineAgents = [
+    'OAI-SearchBot',
+    'ChatGPT-User',
+    'Claude-SearchBot',
+    'Claude-User',
+    'PerplexityBot',
+    'Perplexity-User',
+];
+
+export async function GET(): Promise<Response> {
     const body = [
-		'User-agent: *',
-		'Allow: /',
-		'',
-		`Sitemap: ${url.origin}/sitemap.xml`
-	].join('\n').trim();
+        'User-agent: *',
+        'Allow: /',
+        '',
+        ...answerEngineAgents.map((agent) => `User-agent: ${agent}`),
+        'Allow: /',
+        '',
+        `Sitemap: ${localeDomains.en}/sitemap.xml`,
+    ].join('\n');
 
     const headers = {
         'Content-Type': 'text/plain',
diff --git a/src/routes/rss.xml/+server.ts b/src/routes/rss.xml/+server.ts
index 34964fe3..88f811ca 100644
--- a/src/routes/rss.xml/+server.ts
+++ b/src/routes/rss.xml/+server.ts
@@ -7,6 +7,14 @@ import type {
     PortableTextMarkDefinition,
 } from '@portabletext/types';
 import { encode } from 'html-entities';
+import type { SanityImageSource } from '@sanity/image-url';
+import { urlFor } from '#lib/sanity/image.js';
+import { postModifiedAt } from '#lib/sanity/post-dates.js';
+import { canonicalUrl } from '#lib/i18n/index.js';
+import {
+    internalLinkPath,
+    type InternalLinkReference,
+} from '#lib/sanity/internal-link.js';
 
 export const prerender = true;
 
@@ -15,6 +23,8 @@ type SanityPostForRss = {
     title: string;
     excerpt?: string;
     date: string;
+    lastModified?: string | null;
+    _updatedAt?: string | null;
     tags?: Array<{ name: string }>;
     body: PortableTextBlock[];
     author?: { name: string };
@@ -40,12 +50,19 @@ const rssComponents = {
         portableImage: ({
             value,
         }: {
-            value: { asset?: { url?: string }; alt?: string; caption?: string };
+            value: {
+                image?: SanityImageSource;
+                alt?: string;
+                caption?: string;
+            };
         }) => {
-            const url = value.asset?.url;
-            if (!url) return '';
+            if (!value.image) return '';
+            const url = encode(urlFor(value.image).width(1280).url());
             const alt = encode(value.alt || '');
-            return `<figure><img src="${url}" alt="${alt}" /></figure>`;
+            const caption = value.caption
+                ? `<figcaption>${encode(value.caption)}</figcaption>`
+                : '';
+            return `<figure><img src="${url}" alt="${alt}" />${caption}</figure>`;
         },
         callout: ({
             value,
@@ -66,11 +83,13 @@ const rssComponents = {
         }: {
             children: string;
             value?: PortableTextMarkDefinition & {
-                reference?: { _type: string; slug?: { current: string } };
+                reference?: InternalLinkReference;
             };
         }) => {
-            const slug = value?.reference?.slug?.current || '';
-            return `<a href="${siteBaseUrl}/${slug}">${children}</a>`;
+            const path = internalLinkPath(value?.reference);
+            return path
+                ? `<a href="${canonicalUrl(path)}">${children}</a>`
+                : children;
         },
         link: ({
             children,
@@ -104,6 +123,10 @@ async function xml(posts: SanityPostForRss[]) {
     const renderedPosts = await Promise.all(
         posts.map(async (post) => await renderPost(post))
     );
+    // The feed changes when a post in it does; a build alone changes nothing.
+    const lastChange = Math.max(
+        ...posts.map((post) => Date.parse(postModifiedAt(post)))
+    );
     return `
 <rss version="2.0"
 	xmlns:content="http://purl.org/rss/1.0/modules/content/"
@@ -116,6 +139,8 @@ async function xml(posts: SanityPostForRss[]) {
     <title>${title}</title>
     <link>${siteBaseUrl}</link>
     <description>${escapeXml(description)}</description>
+    <language>en</language>
+    ${posts.length ? `<lastBuildDate>${new Date(lastChange).toUTCString()}</lastBuildDate>` : ''}
     <image>
       <url>${siteBaseUrl}/favicons/favicon-32x32.png</url>
       <title>${escapeXml(title)}</title>
diff --git a/src/routes/sitemap.xml/+server.ts b/src/routes/sitemap.xml/+server.ts
index e6d8ce8c..e52d0fa6 100644
--- a/src/routes/sitemap.xml/+server.ts
+++ b/src/routes/sitemap.xml/+server.ts
@@ -1,8 +1,9 @@
 import * as sitemap from 'super-sitemap/sveltekit';
 import { client } from '#lib/sanity/client.js';
-import { allPostsQuery } from '#lib/sanity/queries.js';
+import { sitemapPostsQuery } from '#lib/sanity/queries.js';
 import { canonicalUrl } from '#lib/i18n/index.js';
 import { getAuthorSlugs } from '#lib/sanity/author.js';
+import { postModifiedAt } from '#lib/sanity/post-dates.js';
 
 export const prerender = true;
 
@@ -11,12 +12,12 @@ const translatedPaths = new Set(['/']);
 
 export async function GET({ url }) {
     // Get all blog posts from Sanity with lastmod data for parameterized routes
-    const sanityPosts = await client.fetch(allPostsQuery);
+    const sanityPosts = await client.fetch(sitemapPostsQuery);
 
     const blogPostParams = sanityPosts.map(
-        (post: { slug: string; lastModified?: string; date: string }) => ({
+        (post: Parameters<typeof postModifiedAt>[0] & { slug: string }) => ({
             values: [post.slug],
-            lastmod: post.lastModified || post.date,
+            lastmod: postModifiedAt(post),
         })
     );
 
diff --git a/tests/e2e/base.spec.ts b/tests/e2e/base.spec.ts
index 1ee43f1b..c918cda0 100644
--- a/tests/e2e/base.spec.ts
+++ b/tests/e2e/base.spec.ts
@@ -4,7 +4,7 @@ test('homepage has title and navigation', async ({ page }) => {
     await page.goto('/');
 
     // Expect a title "to contain" a substring.
-    await expect(page).toHaveTitle(/maxdaten/);
+    await expect(page).toHaveTitle(/Jan-Philip Loos/);
 
     // Check that main navigation elements are present
     await expect(page.locator('nav')).toBeVisible();
diff --git a/tests/e2e/blog-meta-tags.test.ts b/tests/e2e/blog-meta-tags.test.ts
index a1c19448..2d6ee672 100644
--- a/tests/e2e/blog-meta-tags.test.ts
+++ b/tests/e2e/blog-meta-tags.test.ts
@@ -13,6 +13,12 @@ const blogPosts = [
     { slug: '2025-09-03-tdd-infrastructure-terragrunt' },
 ];
 
+/** The path of an absolute production URL, to request it from the server under test. */
+const localPath = (url: string) => {
+    const { pathname, search } = new URL(url);
+    return pathname + search;
+};
+
 test.describe('Blog Post Meta Tags', () => {
     for (const post of blogPosts) {
         test(`should have valid OpenGraph and Twitter meta tags for ${post.slug}`, async ({
@@ -63,11 +69,14 @@ test.describe('Blog Post Meta Tags', () => {
 
             // If og:image exists, verify it
             if (ogImage) {
-                // expect(ogImage).toMatch(/^https?:\/\//); // Should be absolute URL, but not locally atm
+                // Absolute on the final host, whatever origin the page was rendered on
+                expect(ogImage).toMatch(/^https:\/\/www\.maxdaten\.io\//);
                 expect(twitterCard).toBe('summary_large_image');
 
-                // Verify the image URL is accessible
-                const imageResponse = await page.request.get(ogImage);
+                // Verify the image is served (by this server, not production)
+                const imageResponse = await page.request.get(
+                    localPath(ogImage)
+                );
                 expect(imageResponse.status()).toBe(200);
                 expect(imageResponse.headers()['content-type']).toMatch(
                     /image\/(png|jpeg|jpg|webp)/
@@ -151,11 +160,11 @@ test.describe('Blog Post Meta Tags', () => {
         expect(ogTitle).toBeTruthy();
         expect(ogDescription).toBeTruthy();
         expect(ogImage).toBeTruthy();
-        // expect(ogImage).toMatch(/^https?:\/\//); // Should be absolute URL, but not locally atm
+        expect(ogImage).toMatch(/^https:\/\/www\.maxdaten\.io\//);
 
-        // Verify default image is accessible
+        // Verify default image is served (by this server, not production)
         if (ogImage) {
-            const imageResponse = await page.request.get(ogImage);
+            const imageResponse = await page.request.get(localPath(ogImage));
             expect(imageResponse.status()).toBe(200);
         }
 
diff --git a/tests/e2e/error-page.test.ts b/tests/e2e/error-page.test.ts
index bb686b41..193931a5 100644
--- a/tests/e2e/error-page.test.ts
+++ b/tests/e2e/error-page.test.ts
@@ -6,3 +6,11 @@ test('an unknown page says it was not found', async ({ page }) => {
     expect(response?.status()).toBe(404);
     await expect(page.locator('h1')).toHaveText('Page not found');
 });
+
+test('the prerendered /404 page is kept out of the index', async ({ page }) => {
+    await page.goto('/404');
+    await expect(page.locator('meta[name="robots"]')).toHaveAttribute(
+        'content',
+        /^noindex,follow/
+    );
+});
diff --git a/tests/e2e/geo.test.ts b/tests/e2e/geo.test.ts
index 4a97777f..7cfe1585 100644
--- a/tests/e2e/geo.test.ts
+++ b/tests/e2e/geo.test.ts
@@ -40,7 +40,10 @@ test('/about/jloos is an indexable author page', async ({ page }) => {
 
     const robots = page.locator('meta[name="robots"]');
     await expect(robots).toHaveCount(1);
-    await expect(robots).toHaveAttribute('content', /^index/);
+    await expect(robots).toHaveAttribute(
+        'content',
+        'index,follow,max-image-preview:large'
+    );
     await expect(page.locator('meta[name="description"]')).toHaveCount(1);
     await expect(page.locator('link[rel="canonical"]')).toHaveAttribute(
         'href',
@@ -66,8 +69,11 @@ test('the author page is in the sitemap and is the ProfilePage', async ({
     const sitemap = await (await request.get('/sitemap.xml')).text();
     expect(sitemap).toContain(`<loc>${aboutUrl}</loc>`);
 
-    const profile = byType(await jsonLd(page, '/en'), 'ProfilePage');
+    const profile = byType(await jsonLd(page, '/about/jloos'), 'ProfilePage');
     expect(profile?.url).toBe(aboutUrl);
+
+    // Other pages are not profile pages.
+    expect(byType(await jsonLd(page, '/en'), 'ProfilePage')).toBeUndefined();
 });
 
 type Schema = Record<string, unknown> & { '@type'?: string; '@id'?: string };
@@ -221,3 +227,64 @@ test('the author card and footer use the one contact address', async ({
         ).toHaveAttribute('href', 'mailto:jloos@maxdaten.com');
     }
 });
+
+test('hidden posts stay reachable but out of search', async ({
+    page,
+    request,
+}) => {
+    await page.goto('/2025-07-31-continuous-care-no-to-maintenance-processes');
+    await expect(page.locator('meta[name="robots"]')).toHaveAttribute(
+        'content',
+        /^noindex,follow/
+    );
+
+    await page.goto('/2026-01-31-ship-your-toolchain-not-just-infrastructure');
+    await expect(page.locator('meta[name="robots"]')).toHaveAttribute(
+        'content',
+        /^index,follow/
+    );
+
+    const sitemap = await (await request.get('/sitemap.xml')).text();
+    expect(sitemap).not.toContain('continuous-care-no-to-maintenance');
+});
+
+test('/gems has its own title, description and item list', async ({ page }) => {
+    await page.goto('/gems');
+    await expect(page).toHaveTitle('Gems of Precious Friends | maxdaten.io');
+    const description = await page
+        .locator('meta[name="description"]')
+        .getAttribute('content');
+    expect(description).toMatch(/friends/);
+    await expect(page.locator('meta[property="og:title"]')).toHaveAttribute(
+        'content',
+        'Gems of Precious Friends'
+    );
+
+    const list = byType(await jsonLd(page, '/gems'), 'ItemList');
+    expect(list?.numberOfItems).toBeGreaterThan(0);
+});
+
+test('a post carries article tags, word count and its author', async ({
+    page,
+}) => {
+    const slug = '2026-01-31-ship-your-toolchain-not-just-infrastructure';
+    const graph = await jsonLd(page, `/${slug}`);
+
+    for (const property of [
+        'article:published_time',
+        'article:modified_time',
+    ]) {
+        await expect(
+            page.locator(`meta[property="${property}"]`)
+        ).toHaveAttribute('content', /^\d{4}-\d{2}-\d{2}T/);
+    }
+    await expect(
+        page.locator('meta[property="article:author"]')
+    ).toHaveAttribute('content', aboutUrl);
+
+    const posting = byType(graph, 'BlogPosting');
+    expect(posting?.wordCount).toBeGreaterThan(500);
+    expect(posting?.timeRequired).toMatch(/^PT\d+M$/);
+    expect(posting?.author).toEqual({ '@id': 'https://maxdaten.io/#jloos' });
+    expect(posting?.image).toMatch(/[?&]w=1200/);
+});
diff --git a/tests/e2e/i18n.test.ts b/tests/e2e/i18n.test.ts
index 9100e995..a62ccd62 100644
--- a/tests/e2e/i18n.test.ts
+++ b/tests/e2e/i18n.test.ts
@@ -41,7 +41,7 @@ test.describe('i18n — German home page (/)', () => {
             .locator('meta[name="description"]')
             .getAttribute('content');
         expect(description).toBe(
-            'Ich entwickle Ihr digitales Produkt end-to-end und sorge dafür, dass das Wissen in Ihrem Team bleibt — mit Continuous Delivery und Hochverfügbarkeit als Grundlage. Freelance Platform & Product Engineer mit 15+ Jahren Erfahrung in Produktentwicklung, Plattform-Architektur und Tech-Leadership — vom Startup bis zu Systemen mit 100M+ Requests am Tag. Hamburg.'
+            'Ich entwickle Ihr Produkt und die Plattform darunter — Kubernetes, Nix, Continuous Delivery. Hands-on in Ihrem Team, und das Wissen bleibt. Hamburg & remote.'
         );
     });
 
@@ -77,12 +77,6 @@ test.describe('i18n — German home page (/)', () => {
         expect(canonical).toBe('https://maxdaten.de/');
     });
 
-    test('has titleTemplate with maxdaten.de', async ({ page }) => {
-        await page.goto('/');
-        const title = await page.title();
-        expect(title).toContain('maxdaten.de');
-    });
-
     test('has German keywords in meta tags', async ({ page }) => {
         await page.goto('/');
         const keywords = await page
@@ -126,7 +120,7 @@ test.describe('i18n — English home page (/en/)', () => {
             .locator('meta[name="description"]')
             .getAttribute('content');
         expect(description).toBe(
-            'I build your digital product end to end and make sure the knowledge stays in your team — with continuous delivery and high availability as the foundation. Freelance Platform & Product Engineer with 15+ years in product development, platform architecture and tech leadership — from startup to systems at 100M+ requests a day. Hamburg.'
+            'I build your product and the platform under it: Kubernetes, Nix, continuous delivery. Hands-on in your team, and the knowledge stays. Hamburg & remote.'
         );
     });
 
@@ -158,12 +152,6 @@ test.describe('i18n — English home page (/en/)', () => {
         expect(canonical).toBe('https://www.maxdaten.io/en');
     });
 
-    test('has titleTemplate with maxdaten.io', async ({ page }) => {
-        await page.goto('/en');
-        const title = await page.title();
-        expect(title).toContain('maxdaten.io');
-    });
-
     test('has English keywords in meta tags', async ({ page }) => {
         await page.goto('/en');
         const keywords = await page
@@ -327,3 +315,43 @@ test('outside production the language switcher stays on this host', async ({
         '/en'
     );
 });
+
+test.describe('Home links', () => {
+    test('the logo leads to the home page in the page language', async ({
+        page,
+    }) => {
+        await page.goto('/blog');
+        await expect(page.locator('header a.logo')).toHaveAttribute(
+            'href',
+            '/en'
+        );
+
+        await page.goto('/');
+        await expect(page.locator('header a.logo')).toHaveAttribute(
+            'href',
+            '/'
+        );
+    });
+
+    test('"Start over" on the 404 page leads to the English home', async ({
+        page,
+    }) => {
+        await page.goto('/404');
+        await expect(
+            page.getByRole('link', { name: 'Start over' })
+        ).toHaveAttribute('href', '/en');
+    });
+});
+
+for (const path of ['/', '/en']) {
+    test(`${path} has a title naming the offer`, async ({ page }) => {
+        await page.goto(path);
+        await expect(page).toHaveTitle(
+            'Platform & Product Engineer, Hamburg | Jan-Philip Loos'
+        );
+        await expect(page.locator('meta[property="og:title"]')).toHaveAttribute(
+            'content',
+            'Platform & Product Engineer, Hamburg | Jan-Philip Loos'
+        );
+    });
+}
diff --git a/tests/e2e/images.test.ts b/tests/e2e/images.test.ts
index b2f1721b..4386d06d 100644
--- a/tests/e2e/images.test.ts
+++ b/tests/e2e/images.test.ts
@@ -115,3 +115,16 @@ test('a post cover loads eagerly with high priority', async ({ page }) => {
     await expect(cover).toHaveAttribute('loading', 'eager');
     await expect(cover).toHaveAttribute('fetchpriority', 'high');
 });
+
+test('inline post images reserve their space before loading', async ({
+    page,
+}) => {
+    await page.goto('/2025-09-03-tdd-infrastructure-terragrunt');
+
+    const images = page.locator('figure.portable-image img');
+    expect(await images.count()).toBeGreaterThan(0);
+    for (const img of await images.all()) {
+        await expect(img).toHaveAttribute('width', /^\d+$/);
+        await expect(img).toHaveAttribute('height', /^\d+$/);
+    }
+});
diff --git a/tests/e2e/robots.test.ts b/tests/e2e/robots.test.ts
index 4614fe57..32cca139 100644
--- a/tests/e2e/robots.test.ts
+++ b/tests/e2e/robots.test.ts
@@ -23,10 +23,20 @@ test('/robots.txt is valid', async ({ page }) => {
     // Should contain Allow directive
     expect(lines).toContain('Allow: /');
 
+    // Names the answer engines' search crawlers
+    for (const agent of [
+        'OAI-SearchBot',
+        'Claude-SearchBot',
+        'PerplexityBot',
+    ]) {
+        expect(lines).toContain(`User-agent: ${agent}`);
+    }
+
     // Should contain Sitemap reference
     const sitemapLine = lines.find((line) => line.startsWith('Sitemap:'));
     expect(sitemapLine).toBeTruthy();
-    expect(sitemapLine).toMatch(/Sitemap: https?:\/\/.*\/sitemap\.xml/);
+    // One sitemap for both hosts, on the final English host whatever the build origin
+    expect(sitemapLine).toBe('Sitemap: https://www.maxdaten.io/sitemap.xml');
 
     // Verify sitemap URL is valid
     const sitemapUrl = sitemapLine!.split('Sitemap: ')[1];
diff --git a/tests/e2e/rss.test.ts b/tests/e2e/rss.test.ts
new file mode 100644
index 00000000..079bfe9d
--- /dev/null
+++ b/tests/e2e/rss.test.ts
@@ -0,0 +1,20 @@
+import { expect, test } from '@playwright/test';
+
+test('/rss.xml carries inline post images', async ({ request }) => {
+    const xml = await (await request.get('/rss.xml')).text();
+
+    expect(xml).toMatch(
+        /<figure><img src="https:\/\/cdn\.sanity\.io\/images\/[^"]+" alt="[^"]+" \/>/
+    );
+});
+
+test('/rss.xml names its language and last change', async ({ request }) => {
+    const xml = await (await request.get('/rss.xml')).text();
+    const channel = xml.slice(0, xml.indexOf('<item>'));
+
+    expect(channel).toContain('<language>en</language>');
+    const lastBuild = channel.match(
+        /<lastBuildDate>([^<]+)<\/lastBuildDate>/
+    )?.[1];
+    expect(Number.isNaN(Date.parse(lastBuild ?? ''))).toBe(false);
+});
diff --git a/tests/e2e/sitemap.test.ts b/tests/e2e/sitemap.test.ts
index 6160adf9..6aa6b5dd 100644
--- a/tests/e2e/sitemap.test.ts
+++ b/tests/e2e/sitemap.test.ts
@@ -45,3 +45,14 @@ test('/sitemap.xml lists each page on its final host', async ({ request }) => {
         expect(url.origin, url.href).toBe(expectedOrigin);
     }
 });
+
+test('/sitemap.xml dates a post by its last edit', async ({ request }) => {
+    const xml = await (await request.get('/sitemap.xml')).text();
+    const entry = xml.match(
+        /<url>\s*<loc>[^<]*ship-your-toolchain-not-just-infrastructure<\/loc>[\s\S]*?<\/url>/
+    )?.[0];
+
+    // Published 2026-01-31, last edited later; lastmod must not be the publish date.
+    expect(entry).toMatch(/<lastmod>/);
+    expect(entry).not.toMatch(/<lastmod>2026-01-31/);
+});
diff --git a/tests/vercel-redirects.test.ts b/tests/vercel-redirects.test.ts
index c5f4ebf5..d78f3c85 100644
--- a/tests/vercel-redirects.test.ts
+++ b/tests/vercel-redirects.test.ts
@@ -51,6 +51,8 @@ describe('vercel.json redirects', () => {
             'https://www.maxdaten.io/2026-01-31-ship-your-toolchain-not-just-infrastructure',
         ],
         ['maxdaten.de', '/about/jloos', 'https://www.maxdaten.io/about/jloos'],
+        ['www.maxdaten.io', '/impressum', 'https://maxdaten.de/impressum'],
+        ['www.maxdaten.io', '/datenschutz', 'https://maxdaten.de/datenschutz'],
     ])('%s%s redirects permanently to %s', (host, path, location) => {
         const result = redirect(host, path);
         expect(result?.location).toBe(location);
@@ -73,7 +75,7 @@ describe('vercel.json redirects', () => {
         ['maxdaten.de', '/2026-01-31-ship/og.jpg'],
         ['www.maxdaten.io', '/en'],
         ['www.maxdaten.io', '/blog'],
-        ['www.maxdaten.io', '/impressum'],
+        ['www.maxdaten.io', '/about/jloos'],
     ])('%s%s is served without a redirect', (host, path) => {
         expect(redirect(host, path)).toBeNull();
     });
diff --git a/vercel.json b/vercel.json
index dd0d00ab..63d003a9 100644
--- a/vercel.json
+++ b/vercel.json
@@ -16,6 +16,17 @@
             "destination": "/en",
             "permanent": true
         },
+        {
+            "source": "/:page(impressum|datenschutz)",
+            "has": [
+                {
+                    "type": "host",
+                    "value": "www.maxdaten.io"
+                }
+            ],
+            "destination": "https://maxdaten.de/:page",
+            "permanent": true
+        },
         {
             "source": "/:path(.*)",
             "has": [