Merge PR #4: normalize SEO metadata and document structure

Reviewed and corrected. Verification: 47 tests passed; production build and source lint passed; all 15 routes have one title, description, canonical, main and h1; OG assets return HTTP 200.

privat/CV/andreknie.de/index.html

@@ -4,8 +4,19 @@
     <meta charset="UTF-8" />
     <link rel="icon" type="image/png" href="/logos/favicon.png" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>Dr. André Knie — KI, Transformation & Leadership</title>
-    <meta name="description" content="Nüchterne KI-Expertise für Mittelstand, Verwaltung und Hochschulen. Souverän, praktisch, evidenzbasiert." />
+    <title data-seo-fallback>Dr. André Knie – Digitale Souveränität und KI</title>
+    <meta data-seo-fallback name="description" content="Dr. André Knie unterstützt Organisationen dabei, digitale Souveränität zu erlangen und sicher von KI zu profitieren." />
+    <link data-seo-fallback rel="canonical" href="https://andreknie.de/" />
+    <meta data-seo-fallback property="og:type" content="website" />
+    <meta data-seo-fallback property="og:url" content="https://andreknie.de/" />
+    <meta data-seo-fallback property="og:title" content="Dr. André Knie – Digitale Souveränität und KI" />
+    <meta data-seo-fallback property="og:description" content="Dr. André Knie unterstützt Organisationen dabei, digitale Souveränität zu erlangen und sicher von KI zu profitieren." />
+    <meta data-seo-fallback property="og:image" content="https://andreknie.de/images/andre-knie.webp" />
+    <meta data-seo-fallback name="twitter:card" content="summary_large_image" />
+    <meta data-seo-fallback name="twitter:url" content="https://andreknie.de/" />
+    <meta data-seo-fallback name="twitter:title" content="Dr. André Knie – Digitale Souveränität und KI" />
+    <meta data-seo-fallback name="twitter:description" content="Dr. André Knie unterstützt Organisationen dabei, digitale Souveränität zu erlangen und sicher von KI zu profitieren." />
+    <meta data-seo-fallback name="twitter:image" content="https://andreknie.de/images/andre-knie.webp" />
     <!-- Umami Analytics -->
     <script
       defer

privat/CV/andreknie.de/plugins/vite-plugin-content.js

@@ -25,7 +25,7 @@ function readContentDir(subdir) {
         return {
           ...data,
           slug,
-          body: marked(content),
+          body: renderMarkdownContent(content),
           _source: `${subdir}/${filename}`
         }
       }
@@ -41,6 +41,18 @@ function readContentDir(subdir) {
     .filter(Boolean)
 }
 
+export function renderMarkdownContent(content) {
+  const tokens = marked.lexer(content)
+  const firstContentToken = tokens.findIndex(token => token.type !== 'space')
+  const firstToken = tokens[firstContentToken]
+
+  if (firstToken?.type === 'heading' && firstToken.depth === 1) {
+    tokens.splice(firstContentToken, 1)
+  }
+
+  return marked.parser(tokens)
+}
+
 function readMetaFile(filename) {
   const filepath = join(CONTENT_DIR, 'meta', filename)
   if (!existsSync(filepath)) return null

privat/CV/andreknie.de/plugins/vite-plugin-content.test.js

@@ -0,0 +1,19 @@
+import { describe, expect, it } from 'vitest'
+import { renderMarkdownContent } from './vite-plugin-content.js'
+
+describe('markdown content rendering', () => {
+  it('removes only an initial level-one heading', () => {
+    const html = renderMarkdownContent('# Duplicate title\n\nIntro\n\n## Section')
+
+    expect(html).not.toContain('<h1>Duplicate title</h1>')
+    expect(html).toContain('<p>Intro</p>')
+    expect(html).toContain('<h2>Section</h2>')
+  })
+
+  it('keeps content when no initial level-one heading exists', () => {
+    const html = renderMarkdownContent('Intro\n\n# Deliberate heading')
+
+    expect(html).toContain('<p>Intro</p>')
+    expect(html).toContain('<h1>Deliberate heading</h1>')
+  })
+})

privat/CV/andreknie.de/server/index.test.js

@@ -96,4 +96,37 @@ describe('backend mail safety', () => {
     expect(await reserveToken(token)).toMatchObject({ status: 'processing' })
     await releaseToken(token)
   })
+
+  it('rejects unknown resources before any notification is sent', async () => {
+    const response = await fetch(`${baseUrl}/api/resource-download`, {
+      method: 'POST',
+      headers: { 'content-type': 'application/json' },
+      body: JSON.stringify({
+        name: 'Test',
+        email: 'test@example.invalid',
+        company: 'Synthetic Test',
+        resource_id: 'does-not-exist',
+      }),
+    })
+
+    expect(response.status).toBe(400)
+    expect((await response.json()).errors.resource_id).toBeTruthy()
+  })
+
+  it('silently accepts resource honeypot submissions', async () => {
+    const response = await fetch(`${baseUrl}/api/resource-download`, {
+      method: 'POST',
+      headers: { 'content-type': 'application/json' },
+      body: JSON.stringify({
+        name: 'Test',
+        email: 'test@example.invalid',
+        company: 'Synthetic Test',
+        resource_id: 'does-not-exist',
+        company_website: 'https://bot.example.invalid',
+      }),
+    })
+
+    expect(response.status).toBe(201)
+    expect((await response.json()).ok).toBe(true)
+  })
 })

privat/CV/andreknie.de/server/routes/resource-download.js

@@ -1,27 +1,19 @@
 import { Router } from 'express'
-import { readFileSync, writeFileSync, existsSync } from 'fs'
+import { existsSync, readdirSync } from 'fs'
 import { join, dirname } from 'path'
 import { fileURLToPath } from 'url'
-import { Mutex } from 'async-mutex'
 import { resourceLimiter } from '../middleware/rateLimiter.js'
 import { antiSpam } from '../middleware/antiSpam.js'
+import { sendStakeholderNotification, MailerNotReadyError } from '../services/mailer.js'
 
 const __dirname = dirname(fileURLToPath(import.meta.url))
-const LEADS_FILE = join(__dirname, '..', 'data', 'leads.json')
-const leadsMutex = new Mutex()
+const RESOURCES_DIR = join(__dirname, '..', '..', 'public', 'resources')
 
-// Only alphanumeric + hyphen resource IDs are allowed. This prevents path
-// traversal (e.g. "../../etc/passwd") when building the download URL.
-const RESOURCE_ID_PATTERN = /^[a-z0-9]+(-[a-z0-9]+)*$/
-
-function loadLeads() {
-  if (!existsSync(LEADS_FILE)) return []
-  try { return JSON.parse(readFileSync(LEADS_FILE, 'utf-8')) }
-  catch { return [] }
-}
-
-function saveLeads(leads) {
-  writeFileSync(LEADS_FILE, JSON.stringify(leads, null, 2), 'utf-8')
+export function getAvailableResourceIds() {
+  if (!existsSync(RESOURCES_DIR)) return []
+  return readdirSync(RESOURCES_DIR, { withFileTypes: true })
+    .filter(entry => entry.isFile() && entry.name.endsWith('.pdf') && entry.name !== 'speaker-cv-andre-knie.pdf')
+    .map(entry => entry.name.slice(0, -4))
 }
 
 const router = Router()
@@ -34,26 +26,18 @@ router.post('/', resourceLimiter, antiSpam, async (req, res) => {
   if (!email || !/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email)) errors.email = 'Gültige E-Mail erforderlich.'
   if (!company || company.trim().length === 0) errors.company = 'Unternehmen ist erforderlich.'
   if (company && company.length > 150) errors.company = 'Max. 150 Zeichen.'
-  if (!resource_id || !RESOURCE_ID_PATTERN.test(resource_id)) errors.resource_id = 'Ungültige Resource-ID.'
-
-  if (Object.keys(errors).length > 0) {
-    return res.status(400).json({ errors })
+  if (!resource_id || !getAvailableResourceIds().includes(resource_id)) {
+    errors.resource_id = 'Diese Ressource ist derzeit nicht verfügbar.'
   }
 
-  await leadsMutex.runExclusive(async () => {
-    const leads = loadLeads()
-    leads.push({
-      name,
-      email,
-      company,
-      resource_id,
-      timestamp: new Date().toISOString(),
-    })
-    saveLeads(leads)
-  })
+  if (Object.keys(errors).length > 0) return res.status(400).json({ errors })
 
-  // Return download URL (resource files are in public/resources/)
-  res.json({ ok: true, download_url: `/resources/${resource_id}.pdf` })
+  try {
+    await sendStakeholderNotification('resource-download', { name, email, company, resource_id })
+    res.status(202).json({ ok: true, message: 'Danke! Wir prüfen die Anfrage und melden uns bei dir.' })
+  } catch (error) {
+    res.status(error instanceof MailerNotReadyError ? 503 : 502).json({ error: 'Die Anfrage konnte derzeit nicht übermittelt werden.' })
+  }
 })
 
 export default router

privat/CV/andreknie.de/server/services/mailer.js

@@ -59,20 +59,30 @@ export async function sendStakeholderNotification(type, data) {
   const subjects = {
     contact: `Neue Kontaktanfrage von ${data.name}`,
     'talk-request': `Neue Vortragsanfrage von ${data.name}`,
+    'resource-download': `Ressourcenanfrage von ${data.name}`,
   }
 
-  const body = Object.entries(data)
-    .map(([key, val]) => `${key}: ${val}`)
-    .join('\n')
+  const body = buildStakeholderMessage(type, data)
 
   await t.sendMail({
     from: SMTP_USER,
-    to: STAKEHOLDER_EMAIL,
+    to: type === 'resource-download' ? 'kontakt@d-hive.de' : STAKEHOLDER_EMAIL,
     subject: subjects[type] || `Neue Anfrage (${type})`,
     text: body,
   })
 }
 
+export function buildStakeholderMessage(type, data) {
+  const fields = Object.entries(data).map(([key, val]) => `${key}: ${val}`)
+  if (type !== 'resource-download') return fields.join('\n')
+
+  return [
+    'Bitte die angefragten Inhalte prüfen und bei positiver Prüfung ein aktuelles Profil von André verschicken.',
+    '',
+    ...fields,
+  ].join('\n')
+}
+
 export { STAKEHOLDER_EMAIL, BASE_URL }
 
 /**

privat/CV/andreknie.de/server/services/mailer.test.js

@@ -1,5 +1,10 @@
 import { describe, expect, it } from 'vitest'
-import { isMailerReady, MailerNotReadyError, sendConfirmationEmail } from './mailer.js'
+import {
+  buildStakeholderMessage,
+  isMailerReady,
+  MailerNotReadyError,
+  sendConfirmationEmail,
+} from './mailer.js'
 
 describe('mailer readiness', () => {
   it('reports missing SMTP configuration without exposing credentials', async () => {
@@ -10,3 +15,24 @@ describe('mailer readiness', () => {
       .rejects.toMatchObject({ code: 'MAILER_NOT_READY' })
   })
 })
+
+describe('stakeholder notification content', () => {
+  const data = {
+    name: 'Synthetic Test',
+    email: 'test@example.invalid',
+  }
+
+  it('adds the manual profile instruction to resource requests', () => {
+    const message = buildStakeholderMessage('resource-download', data)
+
+    expect(message).toContain('ein aktuelles Profil von André verschicken')
+    expect(message).toContain('name: Synthetic Test')
+  })
+
+  it('does not add the resource instruction to contact notifications', () => {
+    const message = buildStakeholderMessage('contact', data)
+
+    expect(message).not.toContain('ein aktuelles Profil von André verschicken')
+    expect(message).toBe('name: Synthetic Test\nemail: test@example.invalid')
+  })
+})

privat/CV/andreknie.de/src/components/BottomDock.css

@@ -114,6 +114,23 @@
 }
 
 @media (max-width: 600px) {
-  .dock { gap: 6px; padding: 6px 8px; }
-  .dock-item { width: 38px; height: 38px; }
+  .dock-container {
+    bottom: max(12px, env(safe-area-inset-bottom));
+    max-width: calc(100vw - 24px);
+  }
+
+  .dock {
+    gap: 6px;
+    padding: 6px 8px;
+    max-width: 100%;
+  }
+
+  .dock-item-wrapper-secondary {
+    display: none;
+  }
+
+  .dock-item {
+    width: 44px;
+    height: 44px;
+  }
 }

privat/CV/andreknie.de/src/components/BottomDock.jsx

@@ -10,22 +10,27 @@ export default function BottomDock() {
     { label: 'Home', path: '/', icon: <Home size={20} /> },
     { label: 'Artikel', path: '/artikel', icon: <Newspaper size={20} /> },
     { label: 'Kniepunkt', path: '/kniepunkt', icon: <span style={{ fontWeight: 800, fontSize: '1.2rem', fontFamily: 'serif' }}>K</span> },
-    { label: 'Podcast', path: '/podcast', icon: <Mic size={20} /> },
+    { label: 'Podcast', path: '/podcast', icon: <Mic size={20} />, secondary: true },
     { label: 'Speaking', path: '/speaking', icon: <MessageSquare size={20} /> },
-    { label: 'Beratung', path: '/consulting', icon: <Briefcase size={20} /> },
-    { label: 'Über mich', path: '/ueber-mich', icon: <User size={20} /> },
+    { label: 'Beratung', path: '/consulting', icon: <Briefcase size={20} />, secondary: true },
+    { label: 'Über mich', path: '/ueber-mich', icon: <User size={20} />, secondary: true },
     { label: 'Kontakt', path: '/kontakt', icon: <Mail size={20} /> },
   ]
 
   return (
     <div className="dock-container">
-      <nav className="dock">
+      <nav className="dock" aria-label="Schnellnavigation">
         {items.map((item) => {
           const isActive = location.pathname === item.path
           return (
-            <div className="dock-item-wrapper" key={item.path}>
+            <div className={`dock-item-wrapper${item.secondary ? ' dock-item-wrapper-secondary' : ''}`} key={item.path}>
               <span className="dock-tooltip">{item.label}</span>
-              <Link to={item.path} className={`dock-item ${isActive ? 'active' : ''}`}>
+              <Link
+                to={item.path}
+                className={`dock-item ${isActive ? 'active' : ''}`}
+                aria-label={item.label}
+                aria-current={isActive ? 'page' : undefined}
+              >
                 {item.icon}
               </Link>
             </div>

privat/CV/andreknie.de/src/components/BottomDock.test.jsx

@@ -0,0 +1,30 @@
+import React from 'react'
+import { describe, expect, it } from 'vitest'
+import { render } from '@testing-library/react'
+import { MemoryRouter } from 'react-router-dom'
+import { readFileSync } from 'fs'
+import { join } from 'path'
+import BottomDock from './BottomDock'
+
+describe('BottomDock', () => {
+  it('keeps secondary links available on desktop and marks them for mobile hiding', () => {
+    const { container } = render(
+      <MemoryRouter initialEntries={['/']}>
+        <BottomDock />
+      </MemoryRouter>,
+    )
+
+    expect(container.querySelectorAll('.dock-item')).toHaveLength(8)
+    expect(container.querySelectorAll('.dock-item-wrapper-secondary')).toHaveLength(3)
+    expect(container.querySelectorAll('.dock-item[aria-label]')).toHaveLength(8)
+  })
+
+  it('reserves mobile space and keeps touch targets at least 44 pixels', () => {
+    const css = readFileSync(join(process.cwd(), 'src', 'components', 'BottomDock.css'), 'utf-8')
+    const mobileRule = css.match(/@media \(max-width: 600px\) \{([\s\S]*)\}\s*$/)
+
+    expect(mobileRule?.[1]).toContain('dock-item-wrapper-secondary')
+    expect(mobileRule?.[1]).toMatch(/width: 44px/)
+    expect(mobileRule?.[1]).toMatch(/height: 44px/)
+  })
+})

privat/CV/andreknie.de/src/components/SEOHead.jsx

@@ -1,33 +1,36 @@
-import React from 'react'
+import React, { useEffect } from 'react'
 import { Helmet } from 'react-helmet-async'
+import { absoluteUrl, BRAND_SUFFIX, DEFAULT_DESCRIPTION, DEFAULT_IMAGE, DEFAULT_TITLE, normalizeTitle } from './seo.js'
 
-export default function SEOHead({ title, description, url, image, type = 'website' }) {
-  const defaultTitle = "Dr. André Knie - Experte für Digitale Souveränität"
-  const defaultDescription = "Dr. André Knie unterstützt Organisationen dabei, digitale Souveränität zu erlangen und sicher von KI zu profitieren."
+export default function SEOHead({ title, description, url, image, type = 'website', noindex = false }) {
+  const pageTitle = normalizeTitle(title)
+  const siteTitle = pageTitle === DEFAULT_TITLE ? pageTitle : `${pageTitle}${BRAND_SUFFIX}`
+  const siteDescription = description || DEFAULT_DESCRIPTION
+  const canonicalUrl = absoluteUrl(url || '/', '/')
+  const imageUrl = absoluteUrl(image, DEFAULT_IMAGE)
 
-  const siteTitle = title ? `${title} | Dr. André Knie` : defaultTitle
-  const siteDesc = description || defaultDescription
-  const siteUrl = url ? `https://andreknie.de${url}` : "https://andreknie.de"
-  const siteImage = image || "https://andreknie.de/images/og-image.webp"
+  useEffect(() => {
+    document.head.querySelectorAll('[data-seo-fallback]').forEach(node => node.remove())
+  }, [])
 
   return (
     <Helmet>
       <title>{siteTitle}</title>
-      <meta name="description" content={siteDesc} />
+      <meta name="description" content={siteDescription} />
+      <link rel="canonical" href={canonicalUrl} />
+      {noindex && <meta name="robots" content="noindex,follow" />}
 
-      {/* Open Graph / Facebook */}
       <meta property="og:type" content={type} />
-      <meta property="og:url" content={siteUrl} />
+      <meta property="og:url" content={canonicalUrl} />
       <meta property="og:title" content={siteTitle} />
-      <meta property="og:description" content={siteDesc} />
-      <meta property="og:image" content={siteImage} />
+      <meta property="og:description" content={siteDescription} />
+      <meta property="og:image" content={imageUrl} />
 
-      {/* Twitter */}
-      <meta property="twitter:card" content="summary_large_image" />
-      <meta property="twitter:url" content={siteUrl} />
-      <meta property="twitter:title" content={siteTitle} />
-      <meta property="twitter:description" content={siteDesc} />
-      <meta property="twitter:image" content={siteImage} />
+      <meta name="twitter:card" content="summary_large_image" />
+      <meta name="twitter:url" content={canonicalUrl} />
+      <meta name="twitter:title" content={siteTitle} />
+      <meta name="twitter:description" content={siteDescription} />
+      <meta name="twitter:image" content={imageUrl} />
     </Helmet>
   )
 }

privat/CV/andreknie.de/src/components/SEOHead.test.jsx

@@ -0,0 +1,62 @@
+import React from 'react'
+import { afterEach, describe, expect, it } from 'vitest'
+import { render, cleanup } from '@testing-library/react'
+import { HelmetProvider } from 'react-helmet-async'
+import SEOHead from './SEOHead'
+import { BRAND_SUFFIX } from './seo.js'
+
+afterEach(() => {
+  cleanup()
+  document.head.querySelectorAll('[data-rh="true"]').forEach(node => node.remove())
+})
+
+describe('SEOHead', () => {
+  it('renders one branded title, description, and canonical link', () => {
+    render(
+      <HelmetProvider>
+        <SEOHead title={`Artikel${BRAND_SUFFIX}`} description="Synthetic description" url="/artikel" />
+      </HelmetProvider>,
+    )
+
+    expect(document.head.querySelectorAll('title')).toHaveLength(1)
+    expect(document.title).toBe(`Artikel${BRAND_SUFFIX}`)
+    expect(document.title.match(/Dr\. André Knie/g)).toHaveLength(1)
+    expect(document.head.querySelectorAll('meta[name="description"]')).toHaveLength(1)
+    expect(document.head.querySelector('link[rel="canonical"]')?.getAttribute('href')).toBe('https://andreknie.de/artikel')
+  })
+
+  it('replaces static fallback metadata instead of duplicating it', () => {
+    document.head.insertAdjacentHTML('beforeend', `
+      <title data-seo-fallback>Fallback</title>
+      <meta data-seo-fallback name="description" content="Fallback description">
+      <link data-seo-fallback rel="canonical" href="https://andreknie.de/">
+    `)
+
+    render(
+      <HelmetProvider>
+        <SEOHead title="Artikel" description="Article description" url="/artikel" />
+      </HelmetProvider>,
+    )
+
+    expect(document.head.querySelectorAll('[data-seo-fallback]')).toHaveLength(0)
+    expect(document.head.querySelectorAll('title')).toHaveLength(1)
+    expect(document.head.querySelectorAll('meta[name="description"]')).toHaveLength(1)
+    expect(document.head.querySelectorAll('link[rel="canonical"]')).toHaveLength(1)
+  })
+
+  it('normalizes relative and absolute image URLs', () => {
+    const { rerender } = render(
+      <HelmetProvider>
+        <SEOHead title="Test" image="/images/andre-knie.webp" />
+      </HelmetProvider>,
+    )
+
+    expect(document.head.querySelector('meta[property="og:image"]')?.getAttribute('content')).toBe('https://andreknie.de/images/andre-knie.webp')
+    rerender(
+      <HelmetProvider>
+        <SEOHead title="Test" image="https://cdn.example.invalid/image.webp" />
+      </HelmetProvider>,
+    )
+    expect(document.head.querySelector('meta[property="og:image"]')?.getAttribute('content')).toBe('https://cdn.example.invalid/image.webp')
+  })
+})

privat/CV/andreknie.de/src/components/seo.js

@@ -0,0 +1,16 @@
+export const SITE_URL = 'https://andreknie.de'
+export const BRAND_SUFFIX = ' | Dr. André Knie'
+export const DEFAULT_TITLE = 'Dr. André Knie – Digitale Souveränität und KI'
+export const DEFAULT_DESCRIPTION = 'Dr. André Knie unterstützt Organisationen dabei, digitale Souveränität zu erlangen und sicher von KI zu profitieren.'
+export const DEFAULT_IMAGE = '/images/andre-knie.webp'
+
+export function absoluteUrl(value, fallback) {
+  const candidate = value || fallback
+  if (/^https?:\/\//i.test(candidate)) return candidate
+  return new URL(candidate.startsWith('/') ? candidate : `/${candidate}`, SITE_URL).href
+}
+
+export function normalizeTitle(title) {
+  if (!title) return DEFAULT_TITLE
+  return title.endsWith(BRAND_SUFFIX) ? title.slice(0, -BRAND_SUFFIX.length) : title
+}

privat/CV/andreknie.de/src/index.css

@@ -42,6 +42,9 @@
   --radius-md: 16px;
   --radius-lg: 24px;
   --radius-pill: 50px;
+
+  /* Space reserved for the fixed mobile navigation dock. */
+  --dock-content-space: 0px;
 }
 
 /* ==========================================================================
@@ -65,6 +68,13 @@ body {
   font-weight: var(--font-weight-normal);
   line-height: 1.6;
   overflow-x: hidden;
+  padding-bottom: var(--dock-content-space);
+}
+
+@media (max-width: 600px) {
+  :root {
+    --dock-content-space: calc(88px + env(safe-area-inset-bottom));
+  }
 }
 
 h1, h2, h3, h4, h5, h6 {

privat/CV/andreknie.de/src/pages/About.jsx

@@ -2,6 +2,7 @@ import React from 'react'
 import { useMeta } from '../hooks/useContent'
 import { ExternalLink, Globe } from 'lucide-react'
 import SpeakerCvRequest from '../components/SpeakerCvRequest'
+import SEOHead from '../components/SEOHead'
 
 export default function About() {
   const { profile, about } = useMeta()
@@ -12,6 +13,7 @@ export default function About() {
 
   return (
     <main style={{ paddingTop: '120px', minHeight: '100vh' }}>
+      <SEOHead title="Über mich" description="Über Dr. André Knie, seine Arbeit, Stationen und Perspektive auf KI und digitale Souveränität." url="/ueber-mich" />
       <div className="app-container" style={{ maxWidth: '800px' }}>
         <div className="section-header">
           <h1 className="section-title">Über <span className="text-gradient">mich</span></h1>

privat/CV/andreknie.de/src/pages/ArticleSingle.jsx

@@ -11,10 +11,16 @@ export default function ArticleSingle() {
 
   if (!post) {
     return (
-      <div className="page-container app-container" style={{ textAlign: 'center', paddingTop: '150px' }}>
-        <h2>Artikel nicht gefunden</h2>
+      <main className="page-container app-container" style={{ textAlign: 'center', paddingTop: '150px' }}>
+        <SEOHead
+          title="Artikel nicht gefunden"
+          description="Der angeforderte Artikel wurde nicht gefunden."
+          url={`/artikel/${slug}`}
+          noindex
+        />
+        <h1>Artikel nicht gefunden</h1>
         <Link to="/artikel" className="primary-button" style={{ marginTop: '20px' }}>Zurück zur Übersicht</Link>
-      </div>
+      </main>
     )
   }
 
@@ -23,9 +29,11 @@ export default function ArticleSingle() {
     : ''
 
   return (
-    <div className="page-container article-single-page">
+    <main className="page-container article-single-page">
       <SEOHead
-        title={`${post.title} | Dr. André Knie`} 
+        url={`/artikel/${post.slug}`}
+        type="article"
+        title={post.title}
         description={post.excerpt || post.title}
       />
       <div className="app-container" style={{ maxWidth: '800px', margin: '0 auto', paddingTop: '120px' }}>
@@ -48,6 +56,6 @@ export default function ArticleSingle() {
           />
         </article>
       </div>
-    </div>
+    </main>
   )
 }

privat/CV/andreknie.de/src/pages/Articles.jsx

@@ -20,9 +20,10 @@ export default function Articles() {
   })
 
   return (
-    <div className="page-container articles-page">
+    <main className="page-container articles-page">
       <SEOHead
-        title="Artikel & Beiträge | Dr. André Knie" 
+        url="/artikel"
+        title="Artikel & Beiträge"
         description="Aktuelle Artikel und LinkedIn-Beiträge zu den Themen Softwareentwicklung, Leadership und Technologie."
       />
       <header className="page-header">
@@ -102,6 +103,6 @@ export default function Articles() {
           <p className="no-articles">Keine Artikel für diese Suche gefunden.</p>
         )}
       </section>
-    </div>
+    </main>
   )
 }

privat/CV/andreknie.de/src/pages/Confirmation.jsx

@@ -13,6 +13,8 @@ export default function Confirmation() {
       <SEOHead 
         title={isSuccess ? "Vielen Dank" : "Ein Fehler ist aufgetreten"} 
         description={isSuccess ? "Ihre Nachricht wurde erfolgreich gesendet." : "Es gab ein Problem beim Senden Ihrer Nachricht."}
+        url="/bestaetigung"
+        noindex
       />
       <main style={{ paddingTop: '120px', minHeight: '100vh', display: 'flex', alignItems: 'center', justifyContent: 'center' }}>
         <div className="app-container" style={{ textAlign: 'center', maxWidth: '600px' }}>

privat/CV/andreknie.de/src/pages/Consulting.jsx

@@ -1,6 +1,7 @@
 import React from 'react'
 import { useContent, useMeta } from '../hooks/useContent'
 import ServiceAccordion from '../components/ServiceAccordion'
+import SEOHead from '../components/SEOHead'
 
 export default function Consulting() {
   const { items } = useContent('consulting', { pageSize: 10 })
@@ -8,6 +9,7 @@ export default function Consulting() {
 
   return (
     <main style={{ paddingTop: '120px', minHeight: '100vh' }}>
+      <SEOHead title="Beratung" description="Beratung zu KI-Strategie, digitaler Souveränität und praktischer Transformation." url="/consulting" />
       <div className="app-container">
         <div className="section-header">
           <h1 className="section-title"><span className="text-gradient">Leistungen</span></h1>

privat/CV/andreknie.de/src/pages/Contact.jsx

@@ -1,6 +1,7 @@
 import React, { useState } from 'react'
 import { useFormSubmit } from '../hooks/useFormSubmit'
 import { validateContact } from '../utils/validation'
+import SEOHead from '../components/SEOHead'
 
 export default function Contact() {
   const [form, setForm] = useState({ name: '', email: '', message: '', company_website: '' })
@@ -18,6 +19,7 @@ export default function Contact() {
   if (success) {
     return (
       <main style={{ paddingTop: '120px', minHeight: '100vh' }}>
+        <SEOHead title="Kontakt" description="Nimm Kontakt zu Dr. André Knie auf." url="/kontakt" />
         <div className="app-container" style={{ textAlign: 'center', maxWidth: '600px' }}>
           <h1 style={{ marginBottom: '16px' }}>Nachricht gesendet</h1>
           <p style={{ color: 'var(--text-secondary)' }}>Du erhältst eine Bestätigungs-E-Mail. Bitte klicke den Link darin, damit deine Nachricht weitergeleitet wird.</p>
@@ -28,6 +30,7 @@ export default function Contact() {
 
   return (
     <main style={{ paddingTop: '120px', minHeight: '100vh' }}>
+      <SEOHead title="Kontakt" description="Nimm Kontakt zu Dr. André Knie auf." url="/kontakt" />
       <div className="app-container" style={{ maxWidth: '600px' }}>
         <div className="section-header">
           <h1 className="section-title"><span className="text-gradient">Kontakt</span></h1>

privat/CV/andreknie.de/src/pages/Datenschutz.jsx

@@ -1,8 +1,10 @@
 import React from 'react'
+import SEOHead from '../components/SEOHead'
 
 export default function Datenschutz() {
   return (
     <main style={{ paddingTop: '120px', minHeight: '100vh' }}>
+      <SEOHead title="Datenschutz" description="Datenschutzerklärung von andreknie.de." url="/datenschutz" />
       <div className="app-container" style={{ maxWidth: '700px' }}>
         <h1 style={{ marginBottom: '32px' }}>Datenschutzerklärung</h1>
         <div style={{ color: 'var(--text-secondary)', lineHeight: 1.8 }}>
@@ -24,8 +26,8 @@ export default function Datenschutz() {
           <p><strong style={{ color: 'var(--text-primary)' }}>4. Newsletter (Double-Opt-In)</strong></p>
           <p>Für die Newsletter-Anmeldung wird Ihre E-Mail-Adresse bis zur Bestätigung temporär gespeichert. Nach erfolgreicher Bestätigung wird sie als aktives Abonnement gespeichert, bis Sie sich abmelden. Eine Abmeldung können Sie jederzeit per E-Mail an <a href="mailto:kontakt@d-hive.de">kontakt@d-hive.de</a> mit dem Hinweis „Newsletter abbestellen“ veranlassen.</p>
 
-          <p><strong style={{ color: 'var(--text-primary)' }}>5. Ressourcen-Downloads</strong></p>
-          <p>Für einen Ressourcen-Download werden Name, E-Mail-Adresse, Unternehmen, angeforderte Ressource und Zeitpunkt gespeichert. Die Daten dienen der Bearbeitung der Download-Anfrage und der Beziehungspflege. Sie werden gelöscht, sobald der Zweck entfällt oder Sie die Löschung unter <a href="mailto:datenschutz@d-hive.de">datenschutz@d-hive.de</a> anfordern.</p>
+          <p><strong style={{ color: 'var(--text-primary)' }}>5. Ressourcenanfragen</strong></p>
+          <p>Für eine Ressourcenanfrage werden Name, E-Mail-Adresse, Unternehmen und die angeforderte Ressource ausschließlich an <a href="mailto:kontakt@d-hive.de">kontakt@d-hive.de</a> übermittelt. Es erfolgt kein automatischer Download und kein automatischer Versand. Die Anfrage dient der Prüfung, ob André ein aktuelles Profil verschickt. Eine lokale Lead-Datei wird dabei nicht angelegt.</p>
 
           <p><strong style={{ color: 'var(--text-primary)' }}>6. Speaker-CV-Anfrage</strong></p>
           <p>Für die Speaker-CV-Anfrage werden Name, E-Mail-Adresse, Nachricht und Zeitpunkt gespeichert. Die Daten werden nach erfolgreichem Versand des CV zur Bearbeitung und Beziehungspflege gespeichert und gelöscht, sobald der Zweck entfällt oder Sie die Löschung unter <a href="mailto:datenschutz@d-hive.de">datenschutz@d-hive.de</a> anfordern.</p>

privat/CV/andreknie.de/src/pages/Home.css

@@ -12,6 +12,46 @@
   box-sizing: border-box;
 }
 
+@media (max-width: 600px) {
+  .hero {
+    padding-top: 100px;
+    padding-bottom: calc(60px + var(--dock-content-space));
+  }
+
+  .hero-photo {
+    width: 140px;
+    height: 140px;
+    margin-bottom: 16px;
+  }
+
+  .hero h1 {
+    font-size: 2.25rem;
+    margin-bottom: 8px;
+  }
+
+  .hero-roles {
+    font-size: 1rem;
+    margin-bottom: 12px;
+  }
+
+  .hero-subtext {
+    font-size: 1rem;
+    line-height: 1.45;
+    margin-bottom: 24px;
+  }
+
+  .hero-actions {
+    flex-wrap: nowrap;
+    gap: 10px;
+  }
+
+  .hero-actions .primary-button,
+  .hero-actions .secondary-button {
+    padding: 12px 18px;
+    font-size: 0.95rem;
+  }
+}
+
 .hero-content {
   position: relative;
   z-index: 10;

privat/CV/andreknie.de/src/pages/Home.jsx

@@ -6,6 +6,7 @@ import UpcomingEvents from '../components/UpcomingEvents'
 import StatsCube from '../components/StatsCube'
 import DotCloudIcon from '../components/DotCloudIcon'
 import PhotoBand from '../components/PhotoBand'
+import SEOHead from '../components/SEOHead'
 import './Home.css'
 
 const PHOTO_BAND_IMAGES = [
@@ -21,6 +22,7 @@ export default function Home() {
 
   return (
     <main>
+      <SEOHead url="/" />
       {/* Hero */}
       <section className="hero">
         <div className="app-container hero-content">

privat/CV/andreknie.de/src/pages/Impressum.jsx

@@ -1,8 +1,10 @@
 import React from 'react'
+import SEOHead from '../components/SEOHead'
 
 export default function Impressum() {
   return (
     <main style={{ paddingTop: '120px', minHeight: '100vh' }}>
+      <SEOHead title="Impressum" description="Impressum von andreknie.de." url="/impressum" />
       <div className="app-container" style={{ maxWidth: '700px' }}>
         <h1 style={{ marginBottom: '32px' }}>Impressum</h1>
         <div style={{ color: 'var(--text-secondary)', lineHeight: 1.8 }}>

privat/CV/andreknie.de/src/pages/Kniepunkt.jsx

@@ -4,6 +4,7 @@ import { Search } from 'lucide-react'
 import { useContent } from '../hooks/useContent'
 import { formatDate } from '../utils/formatDate'
 import { decodeHtml } from '../utils/decodeHtml'
+import SEOHead from '../components/SEOHead'
 
 export default function Kniepunkt() {
   const [searchQuery, setSearchQuery] = useState('')
@@ -21,6 +22,7 @@ export default function Kniepunkt() {
 
   return (
     <main style={{ paddingTop: '120px', minHeight: '100vh' }}>
+      <SEOHead title="Kniepunkt" description="Die Kniepunkt-Kolumne von Dr. André Knie über KI, Technologie und die Absurditäten des digitalen Wandels." url="/kniepunkt" />
       <div className="app-container">
         <div className="section-header">
           <h1 className="section-title"><span className="text-gradient">Kniepunkt</span></h1>

privat/CV/andreknie.de/src/pages/KniepunktIssue.jsx

@@ -2,6 +2,7 @@ import React from 'react'
 import { useParams, Link } from 'react-router-dom'
 import { useContentItem } from '../hooks/useContent'
 import { formatDate } from '../utils/formatDate'
+import SEOHead from '../components/SEOHead'
 
 export default function KniepunktIssue() {
   const { slug } = useParams()
@@ -10,6 +11,7 @@ export default function KniepunktIssue() {
   if (!issue) {
     return (
       <main style={{ paddingTop: '120px', minHeight: '100vh' }}>
+        <SEOHead title="Kniepunkt-Ausgabe nicht gefunden" description="Die angeforderte Kniepunkt-Ausgabe wurde nicht gefunden." noindex url={`/kniepunkt/${slug}`} />
         <div className="app-container" style={{ textAlign: 'center' }}>
           <h1>Ausgabe nicht gefunden</h1>
           <p style={{ color: 'var(--text-secondary)' }}>Diese Kniepunkt-Ausgabe existiert nicht.</p>
@@ -21,6 +23,7 @@ export default function KniepunktIssue() {
 
   return (
     <main style={{ paddingTop: '120px', minHeight: '100vh' }}>
+      <SEOHead title={issue.title} description={issue.summary || issue.title} url={`/kniepunkt/${issue.slug}`} type="article" image={issue.image} />
       <div className="app-container" style={{ maxWidth: '700px' }}>
         <Link to="/kniepunkt" style={{ color: 'var(--text-secondary)', fontSize: '0.9rem', marginBottom: '24px', display: 'inline-block' }}>&larr; Alle Ausgaben</Link>
         <h1 style={{ marginBottom: '12px' }}>{issue.title}</h1>

privat/CV/andreknie.de/src/pages/NotFound.jsx

@@ -1,9 +1,11 @@
 import React from 'react'
 import { Link } from 'react-router-dom'
+import SEOHead from '../components/SEOHead'
 
 export default function NotFound() {
   return (
     <main style={{ paddingTop: '120px', minHeight: '100vh', display: 'flex', alignItems: 'center', justifyContent: 'center' }}>
+      <SEOHead title="Seite nicht gefunden" description="Die angeforderte Seite wurde nicht gefunden." noindex url="/404" />
       <div className="app-container" style={{ textAlign: 'center' }}>
         <h1 style={{ fontSize: '6rem', marginBottom: '16px' }}><span className="text-gradient">404</span></h1>
         <p style={{ color: 'var(--text-secondary)', fontSize: '1.2rem', marginBottom: '32px' }}>Diese Seite existiert nicht.</p>

privat/CV/andreknie.de/src/pages/Podcast.jsx

@@ -2,6 +2,7 @@ import React from 'react'
 import { useContent } from '../hooks/useContent'
 import { formatDate } from '../utils/formatDate'
 import { ExternalLink } from 'lucide-react'
+import SEOHead from '../components/SEOHead'
 
 export default function Podcast() {
   const { items: allEpisodes } = useContent('podcast', { visibility: 'all', pageSize: 100 })
@@ -13,6 +14,7 @@ export default function Podcast() {
 
   return (
     <main style={{ paddingTop: '120px', minHeight: '100vh' }}>
+      <SEOHead title="Podcast" description="Podcasts, Gastauftritte und Gespräche von und mit Dr. André Knie über KI, Transformation und Leadership." url="/podcast" />
       <div className="app-container" style={{ maxWidth: '800px', margin: '0 auto' }}>
         <div className="section-header">
           <h1 className="section-title"><span className="text-gradient">Podcast</span></h1>

privat/CV/andreknie.de/src/pages/Resources.jsx

@@ -1,29 +1,112 @@
-import React from 'react'
+import React, { useState } from 'react'
 import { useContent } from '../hooks/useContent'
+import { useFormSubmit } from '../hooks/useFormSubmit'
+import { validateResourceDownload } from '../utils/validation'
+import SEOHead from '../components/SEOHead'
+
+const inputStyle = {
+  width: '100%',
+  padding: '12px',
+  background: 'var(--bg-elevated)',
+  border: '1px solid var(--glass-border)',
+  borderRadius: 'var(--radius-sm)',
+  color: 'var(--text-primary)',
+  fontSize: '1rem',
+}
+
+function ResourceRequestForm({ resource, onCancel }) {
+  const resourceId = resource.id || resource.slug
+  const [form, setForm] = useState({ name: '', email: '', company: '', resource_id: resourceId, company_website: '' })
+  const { submit, loading, success, errors, serverError } = useFormSubmit('/api/resource-download', validateResourceDownload)
+
+  function updateField(event) {
+    setForm(prev => ({ ...prev, [event.target.name]: event.target.value }))
+  }
+
+  async function handleSubmit(event) {
+    event.preventDefault()
+    await submit(form)
+  }
+
+  return (
+    <div className="glass-panel" style={{ padding: '24px', marginTop: '24px' }}>
+      {success ? (
+        <p style={{ margin: 0, color: 'var(--text-primary)' }}>
+          Danke! Wir prüfen die Anfrage und melden uns bei dir.
+        </p>
+      ) : (
+        <form onSubmit={handleSubmit} noValidate>
+          <h2 style={{ fontSize: '1.25rem', marginBottom: '8px' }}>Material anfragen</h2>
+          <p style={{ color: 'var(--text-secondary)', marginTop: 0 }}>
+            Wir prüfen die Anfrage. Bei positiver Prüfung verschickt André ein aktuelles Profil persönlich.
+          </p>
+
+          <div aria-hidden="true" style={{ position: 'absolute', left: '-9999px', width: '1px', height: '1px', overflow: 'hidden' }}>
+            <label htmlFor="resource-company-website">Firmen-Website (bitte leer lassen)</label>
+            <input id="resource-company-website" name="company_website" tabIndex={-1} autoComplete="off" value={form.company_website} onChange={updateField} />
+          </div>
+
+          <input type="hidden" name="resource_id" value={resourceId} />
+
+          <label htmlFor="resource-name">Name</label>
+          <input id="resource-name" name="name" value={form.name} onChange={updateField} style={inputStyle} autoComplete="name" aria-invalid={Boolean(errors.name)} />
+          {errors.name && <p role="alert" style={{ color: '#ff4444', margin: '4px 0 12px' }}>{errors.name}</p>}
+
+          <label htmlFor="resource-email">E-Mail</label>
+          <input id="resource-email" name="email" type="email" value={form.email} onChange={updateField} style={inputStyle} autoComplete="email" aria-invalid={Boolean(errors.email)} />
+          {errors.email && <p role="alert" style={{ color: '#ff4444', margin: '4px 0 12px' }}>{errors.email}</p>}
+
+          <label htmlFor="resource-company">Unternehmen</label>
+          <input id="resource-company" name="company" value={form.company} onChange={updateField} style={inputStyle} autoComplete="organization" aria-invalid={Boolean(errors.company)} />
+          {errors.company && <p role="alert" style={{ color: '#ff4444', margin: '4px 0 12px' }}>{errors.company}</p>}
+
+          {serverError && <p role="alert" style={{ color: '#ff4444' }}>{serverError}</p>}
+          {errors.resource_id && <p role="alert" style={{ color: '#ff4444' }}>{errors.resource_id}</p>}
+
+          <div style={{ display: 'flex', gap: '12px', marginTop: '20px', flexWrap: 'wrap' }}>
+            <button type="submit" className="primary-button" disabled={loading}>
+              {loading ? 'Wird gesendet...' : 'Anfrage senden'}
+            </button>
+            <button type="button" className="secondary-button" onClick={onCancel}>Abbrechen</button>
+          </div>
+        </form>
+      )}
+    </div>
+  )
+}
 
 export default function Resources() {
   const { items } = useContent('resources', { pageSize: 20 })
+  const [selectedResource, setSelectedResource] = useState(null)
 
   return (
     <main style={{ paddingTop: '120px', minHeight: '100vh' }}>
+      <SEOHead title="Ressourcen" description="Ausgewählte Materialien und Profile von Dr. André Knie auf Anfrage." url="/resources" />
       <div className="app-container">
         <div className="section-header">
           <h1 className="section-title"><span className="text-gradient">Ressourcen</span></h1>
-          <p className="section-subtitle">Praktische Materialien zum Download.</p>
+          <p className="section-subtitle">Materialien auf Anfrage. Jede Anfrage wird zunächst geprüft.</p>
         </div>
 
         <div style={{ display: 'grid', gap: '20px', maxWidth: '700px', margin: '0 auto' }}>
-          {items.map(res => (
-            <div key={res.id || res.slug} className="glass-panel" style={{ padding: '24px', display: 'flex', justifyContent: 'space-between', alignItems: 'center', gap: '16px' }}>
+          {items.map(resource => {
+            const resourceId = resource.id || resource.slug
+            const selected = selectedResource === resourceId
+            return (
+              <div key={resourceId} className="glass-panel" style={{ padding: '24px' }}>
+                <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', gap: '16px', flexWrap: 'wrap' }}>
                   <div>
-                <h3 style={{ marginBottom: '4px', fontSize: '1.1rem' }}>{res.title}</h3>
-                <p style={{ color: 'var(--text-secondary)', margin: 0, fontSize: '0.9rem' }}>{res.description}</p>
+                    <h2 style={{ marginBottom: '4px', fontSize: '1.1rem' }}>{resource.title}</h2>
+                    <p style={{ color: 'var(--text-secondary)', margin: 0, fontSize: '0.9rem' }}>{resource.description}</p>
                   </div>
-              <button className="primary-button" style={{ padding: '10px 20px', fontSize: '0.9rem', whiteSpace: 'nowrap' }}>
-                Download
+                  <button type="button" className="primary-button" onClick={() => setSelectedResource(selected ? null : resourceId)} style={{ padding: '10px 20px', fontSize: '0.9rem', whiteSpace: 'nowrap' }}>
+                    {selected ? 'Schließen' : 'Material anfragen'}
                   </button>
                 </div>
-          ))}
+                {selected && <ResourceRequestForm key={resourceId} resource={resource} onCancel={() => setSelectedResource(null)} />}
+              </div>
+            )
+          })}
           {items.length === 0 && <p style={{ textAlign: 'center', color: 'var(--text-secondary)' }}>Ressourcen werden vorbereitet.</p>}
         </div>
       </div>

privat/CV/andreknie.de/src/pages/Speaking.jsx

@@ -1,6 +1,7 @@
 import React from 'react'
 import { useContent, useMeta } from '../hooks/useContent'
 import SpeakingAccordion from '../components/SpeakingAccordion'
+import SEOHead from '../components/SEOHead'
 
 export default function Speaking() {
   const { items: allTalks } = useContent('talks', { visibility: 'all', pageSize: 100 })
@@ -9,6 +10,7 @@ export default function Speaking() {
 
   return (
     <main style={{ paddingTop: '120px', minHeight: '100vh' }}>
+      <SEOHead title="Speaking" description="Keynotes, Workshops und Panels von Dr. André Knie zu KI, Transformation und Leadership." url="/speaking" />
       <div className="app-container">
         <div className="section-header">
           <h1 className="section-title"><span className="text-gradient">Speaking</span></h1>

privat/CV/andreknie.de/src/utils/validation.js

@@ -41,6 +41,6 @@ export function validateResourceDownload(data) {
   if (!data.email || !validateEmail(data.email)) errors.email = 'Gültige E-Mail-Adresse erforderlich.'
   if (!data.company || data.company.trim().length === 0) errors.company = 'Unternehmen ist erforderlich.'
   if (data.company && data.company.length > 150) errors.company = 'Unternehmen darf maximal 150 Zeichen lang sein.'
-  if (!data.resource_id) errors.resource_id = 'Resource-ID fehlt.'
+  if (!data.resource_id || !/^[a-z0-9]+(?:-[a-z0-9]+)*$/.test(data.resource_id)) errors.resource_id = 'Resource-ID fehlt oder ist ungültig.'
   return { valid: Object.keys(errors).length === 0, errors }
 }

privat/CV/andreknie.de/src/utils/validation.test.js

@@ -125,4 +125,10 @@ describe('validateResourceDownload', () => {
     expect(result.valid).toBe(false)
     expect(result.errors.resource_id).toBeTruthy()
   })
+
+  it('fails for a resource id that could escape the resource naming scheme', () => {
+    const result = validateResourceDownload({ ...valid, resource_id: '../profile' })
+    expect(result.valid).toBe(false)
+    expect(result.errors.resource_id).toBeTruthy()
+  })
 })