diff --git a/src/lib/previewApi.js b/src/lib/previewApi.js
new file mode 100644
index 0000000..d93f435
--- /dev/null
+++ b/src/lib/previewApi.js
@@ -0,0 +1,56 @@
+import { account } from './appwrite'
+
+const PROJECT_ADMIN_URL =
+  import.meta.env.VITE_PROJECT_ADMIN_URL || 'https://project.webklar.com'
+
+// Wie kindsFetch in projectKindsApi.js: der Fehler trägt .status und .data
+// (z. B. 409 { error: 'Preview-Runner ist nicht aktiv' }, 503 bei Überlast).
+async function previewFetch(path, options = {}) {
+  const jwt = await account.createJWT()
+  const response = await fetch(`${PROJECT_ADMIN_URL}${path}`, {
+    ...options,
+    headers: {
+      Authorization: `Bearer ${jwt.jwt}`,
+      'Content-Type': 'application/json',
+      ...options.headers,
+    },
+  })
+  const data = await response.json().catch(() => ({}))
+  if (!response.ok) {
+    const error = new Error(data.error || `API-Fehler ${response.status}`)
+    error.status = response.status
+    error.data = data
+    throw error
+  }
+  return data
+}
+
+const base = (projectId) => `/api/admin/website-projects/${encodeURIComponent(projectId)}/preview`
+
+export function fetchPreview(projectId) {
+  return previewFetch(base(projectId))
+}
+
+export function setPreviewMode(projectId, mode) {
+  return previewFetch(base(projectId), { method: 'PATCH', body: JSON.stringify({ mode }) })
+}
+
+export function savePreviewEnv(projectId, { set = {}, remove = [] } = {}) {
+  return previewFetch(`${base(projectId)}/env`, { method: 'PUT', body: JSON.stringify({ set, remove }) })
+}
+
+export function rebuildPreview(projectId) {
+  return previewFetch(`${base(projectId)}/rebuild`, { method: 'POST' })
+}
+
+export function startPreviewDev(projectId) {
+  return previewFetch(`${base(projectId)}/dev/start`, { method: 'POST' })
+}
+
+export function stopPreviewDev(projectId) {
+  return previewFetch(`${base(projectId)}/dev/stop`, { method: 'POST' })
+}
+
+export function fetchPreviewLog(projectId, runFile) {
+  return previewFetch(`${base(projectId)}/logs/${encodeURIComponent(runFile)}`)
+}
diff --git a/src/lib/previewView.js b/src/lib/previewView.js
new file mode 100644
index 0000000..13a25ed
--- /dev/null
+++ b/src/lib/previewView.js
@@ -0,0 +1,66 @@
+// Anzeige-Logik für den Block "Preview" (Status, Erkennung, Modi)
+
+export const MODE_OPTIONS = [
+  { value: 'auto', label: 'Automatisch' },
+  { value: 'build', label: 'Build' },
+  { value: 'dev', label: 'Dev-Server' },
+  { value: 'off', label: 'Aus' },
+]
+
+const dateFormat = new Intl.DateTimeFormat('de-DE', {
+  timeZone: 'Europe/Berlin',
+  day: '2-digit',
+  month: '2-digit',
+  hour: '2-digit',
+  minute: '2-digit',
+  hourCycle: 'h23',
+})
+
+// "TT.MM. HH:MM" in Europe/Berlin
+function formatBerlin(value) {
+  const d = new Date(value)
+  if (!value || Number.isNaN(d.getTime())) return ''
+  const parts = Object.fromEntries(dateFormat.formatToParts(d).map((p) => [p.type, p.value]))
+  return `${parts.day}.${parts.month}. ${parts.hour}:${parts.minute}`
+}
+
+export function previewStatus(p) {
+  const state = p?.state || 'off'
+  switch (state) {
+    case 'online': {
+      const at = formatBerlin(p.builtAt)
+      const sha = p.builtSha ? String(p.builtSha).slice(0, 7) : ''
+      if (!at) return { color: 'green', text: 'Online' }
+      return { color: 'green', text: `Online seit ${at}${sha ? ` (Build ${sha})` : ''}` }
+    }
+    case 'building':
+      return { color: 'yellow', text: 'Baut gerade …' }
+    case 'starting':
+      return { color: 'yellow', text: 'Dev-Server startet …' }
+    case 'sleeping':
+      return { color: 'yellow', text: 'Dev-Server schläft, startet beim nächsten Aufruf' }
+    case 'failed':
+      return { color: 'red', text: 'Build fehlgeschlagen – letzte funktionierende Version ist online' }
+    default:
+      return { color: 'grey', text: 'Keine Preview' }
+  }
+}
+
+// 'static' | 'build:<pm>' | 'dev:<pm>' | 'build:<framework>:<pm>' ⇒ Anzeigetext
+export function detectedLabel(detected) {
+  if (!detected || typeof detected !== 'string') return ''
+  if (detected === 'static') return 'Statisch'
+  const [kind, ...rest] = detected.split(':')
+  const base = kind === 'build' ? 'Build' : kind === 'dev' ? 'Dev-Server' : ''
+  if (!base || !rest.length || rest.some((x) => !x)) return ''
+  const pm = rest[rest.length - 1]
+  const fw = rest.length > 1 ? rest[0] : ''
+  const fwLabel = fw ? fw.charAt(0).toUpperCase() + fw.slice(1) : ''
+  return `${base} (${fwLabel ? `${fwLabel}, ` : ''}${pm})`
+}
+
+export function modeHint(mode, detected) {
+  if ((mode || 'auto') !== 'auto') return ''
+  const label = detectedLabel(detected)
+  return label ? `Automatisch → ${label}` : ''
+}
diff --git a/tests/unit/previewView.test.mjs b/tests/unit/previewView.test.mjs
new file mode 100644
index 0000000..c6ede46
--- /dev/null
+++ b/tests/unit/previewView.test.mjs
@@ -0,0 +1,63 @@
+import test from 'node:test'
+import assert from 'node:assert/strict'
+import { loadModule } from './load.mjs'
+
+const { previewStatus, detectedLabel, modeHint, MODE_OPTIONS } = await loadModule('src/lib/previewView.js')
+
+test('previewStatus online: Datum in Europe/Berlin und sha7', () => {
+  const s = previewStatus({ state: 'online', builtAt: '2026-09-30T13:05:00Z', builtSha: 'abcdef1234567890' })
+  assert.deepEqual(s, { color: 'green', text: 'Online seit 30.09. 15:05 (Build abcdef1)' })
+})
+
+test('previewStatus online im Winter (MEZ)', () => {
+  const s = previewStatus({ state: 'online', builtAt: '2026-01-05T08:07:00Z', builtSha: 'abcdef1' })
+  assert.equal(s.text, 'Online seit 05.01. 09:07 (Build abcdef1)')
+})
+
+test('previewStatus online ohne Datum/sha bleibt lesbar', () => {
+  assert.deepEqual(previewStatus({ state: 'online' }), { color: 'green', text: 'Online' })
+})
+
+test('previewStatus weitere Zustände', () => {
+  assert.deepEqual(previewStatus({ state: 'building' }), { color: 'yellow', text: 'Baut gerade …' })
+  assert.deepEqual(previewStatus({ state: 'starting' }), { color: 'yellow', text: 'Dev-Server startet …' })
+  assert.deepEqual(previewStatus({ state: 'sleeping' }), { color: 'yellow', text: 'Dev-Server schläft, startet beim nächsten Aufruf' })
+  assert.deepEqual(previewStatus({ state: 'failed' }), { color: 'red', text: 'Build fehlgeschlagen – letzte funktionierende Version ist online' })
+  assert.deepEqual(previewStatus({ state: 'off' }), { color: 'grey', text: 'Keine Preview' })
+})
+
+test('previewStatus leer/unbekannt/null ⇒ grau', () => {
+  const grey = { color: 'grey', text: 'Keine Preview' }
+  assert.deepEqual(previewStatus({ state: '' }), grey)
+  assert.deepEqual(previewStatus({}), grey)
+  assert.deepEqual(previewStatus(null), grey)
+  assert.deepEqual(previewStatus({ state: 'xyz' }), grey)
+})
+
+test('detectedLabel', () => {
+  assert.equal(detectedLabel('static'), 'Statisch')
+  assert.equal(detectedLabel('build:npm'), 'Build (npm)')
+  assert.equal(detectedLabel('dev:pnpm'), 'Dev-Server (pnpm)')
+  assert.equal(detectedLabel('build:vite:npm'), 'Build (Vite, npm)')
+  assert.equal(detectedLabel('dev:npm'), 'Dev-Server (npm)')
+  assert.equal(detectedLabel(''), '')
+  assert.equal(detectedLabel(null), '')
+  assert.equal(detectedLabel('foo:npm'), '')
+})
+
+test('modeHint', () => {
+  assert.equal(modeHint('auto', 'build:npm'), 'Automatisch → Build (npm)')
+  assert.equal(modeHint('auto', 'static'), 'Automatisch → Statisch')
+  assert.equal(modeHint('', 'dev:pnpm'), 'Automatisch → Dev-Server (pnpm)')
+  assert.equal(modeHint('auto', ''), '')
+  assert.equal(modeHint('build', 'build:npm'), '')
+})
+
+test('MODE_OPTIONS', () => {
+  assert.deepEqual(MODE_OPTIONS, [
+    { value: 'auto', label: 'Automatisch' },
+    { value: 'build', label: 'Build' },
+    { value: 'dev', label: 'Dev-Server' },
+    { value: 'off', label: 'Aus' },
+  ])
+})