diff --git a/dist/index.d.ts b/dist/index.d.ts
index b41d7e1..3d4b2b0 100644
--- a/dist/index.d.ts
+++ b/dist/index.d.ts
@@ -30,6 +30,7 @@ export { getGlobal, getSiteIntegrations, getSiteSettings, SITE_INTEGRATIONS_SLUG
 export { buildSecurityHeaders } from './modules/security/index.js';
 export type { BuildSecurityHeadersArgs, SecurityHeader } from './modules/security/index.js';
 export { buildIconsMetadata, buildOrganizationJsonLd, validateFaviconField, } from './modules/seo/index.js';
+export { buildBreadcrumbJsonLd, buildSiteNavigationJsonLd, buildWebSiteJsonLd, } from './modules/seo/index.js';
 export type { PageMetadata, SeoMeta, SeoOption } from './modules/seo/index.js';
 export { buildHreflangAlternates, buildMetadata, composeTitle } from './modules/seo/index.js';
 export type { AutoFillMapping, RobotsRules, SitemapEntry } from './modules/seo/index.js';
diff --git a/dist/index.js b/dist/index.js
index 29d5f2f..8245f36 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -19,6 +19,9 @@ export { ALL_SYSTEM_PAGE_ROLES, getSystemPagePath } from './modules/pages/index.
 export { getGlobal, getSiteIntegrations, getSiteSettings, SITE_INTEGRATIONS_SLUG, SITE_SETTINGS_SLUG } from './modules/payload/index.js';
 export { buildSecurityHeaders } from './modules/security/index.js';
 export { buildIconsMetadata, buildOrganizationJsonLd, validateFaviconField } from './modules/seo/index.js';
+// Structured data (schema.org JSON-LD) — brand/sitelink signals for Google.
+// WebSite (+ optional SearchAction), BreadcrumbList (per page), SiteNavigation.
+export { buildBreadcrumbJsonLd, buildSiteNavigationJsonLd, buildWebSiteJsonLd } from './modules/seo/index.js';
 export { buildHreflangAlternates, buildMetadata, composeTitle } from './modules/seo/index.js';
 export { buildAutoFillMetaHook, buildRobots, buildSitemapEntries, createMetadataGenerator, createPageMetadata, injectAutoFillMeta } from './modules/seo/index.js';
 export { buildSlugField, toSlug } from './modules/slug/index.js';
diff --git a/dist/index.js.map b/dist/index.js.map
index 6c2bc83..b8741f1 100644
--- a/dist/index.js.map
+++ b/dist/index.js.map
@@ -1 +1 @@
-{"version":3,"sources":["../src/index.ts"],"sourcesContent":["export type { AccessOption, Role } from './modules/access/index.js'\nexport {\n  adminOnly,\n  adminOnlyField,\n  adminOrEditor,\n  adminOrEditorField,\n  adminOrSelf,\n  authenticated,\n  hasMinimumRole,\n  isAdmin,\n  isEditor,\n  requireRole,\n  requireRoleField,\n  ROLE_HIERARCHY,\n} from './modules/access/index.js'\nexport type { AnalyticsConfig } from './modules/analytics/index.js'\nexport { getAnalyticsConfig } from './modules/analytics/index.js'\nexport {\n  ACCEPT_ALL_CONSENT,\n  CONSENT_CATEGORIES,\n  CONSENT_COOKIE,\n  CONSENT_MAX_AGE,\n  CONSENT_VERSION,\n  DEFAULT_CONSENT,\n  getConsentTexts,\n  parseConsent,\n  REJECT_ALL_CONSENT,\n  serializeConsent,\n  setDefaultConsent,\n  updateConsent,\n} from './modules/consent/index.js'\nexport type { ConsentCategory, ConsentState, ConsentTexts } from './modules/consent/index.js'\nexport type {\n  ContentCollectionOption,\n  ContentOption,\n  ResolvedRoute,\n} from './modules/content/index.js'\nexport {\n  archiveFieldName,\n  buildArchivePath,\n  buildEntryPath,\n  getArchiveEntries,\n  parsePageParam,\n  resolveRoute,\n} from './modules/content/index.js'\nexport type { ArchiveEntries } from './modules/content/index.js'\nexport { graphAdapter } from './modules/email/graphAdapter.js'\nexport type { GraphAdapterArgs } from './modules/email/graphAdapter.js'\nexport { mailAdapter } from './modules/email/mailAdapter.js'\nexport type { MailAdapterArgs } from './modules/email/mailAdapter.js'\n// Imported straight from the file, NOT from ./modules/email/index.js — that\n// barrel re-exports sendEmail, which imports 'server-only' and would crash when\n// Payload loads the config (or runs generate:importmap) as a plain Node script.\nexport { panelSmtpAdapter } from './modules/email/panelSmtpAdapter.js'\nexport type { PanelSmtpAdapterArgs } from './modules/email/panelSmtpAdapter.js'\nexport { buildFormsPlugin } from './modules/forms/formsPluginConfig.js'\nexport type {\n  FormsCollectionOverrides,\n  FormsFieldsOverride,\n  FormsOption,\n} from './modules/forms/types.js'\nexport { createContentHelpers } from './modules/frontend/index.js'\nexport type { I18nConfig, LocaleDefinition, LocalizedSlugs } from './modules/i18n/index.js'\nexport {\n  buildLocalizedPath,\n  getDefaultLocale,\n  getLocaleCodes,\n  getLocaleDefinition,\n  getLocalizedSlugs,\n  isValidLocale,\n  LOCALE_COOKIE_NAME,\n  matchAcceptLanguage,\n  negotiateLocale,\n  switchLocalePath,\n} from './modules/i18n/index.js'\nexport type { LocaleMiddlewareResult } from './modules/i18n/index.js'\nexport { createLocaleMiddleware, DEFAULT_MIDDLEWARE_MATCHER } from './modules/i18n/index.js'\n// Media — filename normalization hook for upload collections (Media).\nexport { normalizeFilename, normalizeFilenameHook } from './modules/media/index.js'\nexport {\n  getNotificationTexts,\n  NOTIFICATION_FALLBACK,\n  resolveFormMessage,\n} from './modules/notifications/index.js'\nexport type {\n  FormNotificationTexts,\n  NotificationsData,\n  NotificationTexts,\n} from './modules/notifications/index.js'\nexport type { PagesOption, SystemPageRole } from './modules/pages/index.js'\nexport { ALL_SYSTEM_PAGE_ROLES, getSystemPagePath } from './modules/pages/index.js'\nexport type { GlobalQueryOptions } from './modules/payload/index.js'\nexport {\n  getGlobal,\n  getSiteIntegrations,\n  getSiteSettings,\n  SITE_INTEGRATIONS_SLUG,\n  SITE_SETTINGS_SLUG,\n} from './modules/payload/index.js'\nexport { buildSecurityHeaders } from './modules/security/index.js'\nexport type { BuildSecurityHeadersArgs, SecurityHeader } from './modules/security/index.js'\nexport {\n  buildIconsMetadata,\n  buildOrganizationJsonLd,\n  validateFaviconField,\n} from './modules/seo/index.js'\nexport type { PageMetadata, SeoMeta, SeoOption } from './modules/seo/index.js'\nexport { buildHreflangAlternates, buildMetadata, composeTitle } from './modules/seo/index.js'\nexport type { AutoFillMapping, RobotsRules, SitemapEntry } from './modules/seo/index.js'\nexport {\n  buildAutoFillMetaHook,\n  buildRobots,\n  buildSitemapEntries,\n  createMetadataGenerator,\n  createPageMetadata,\n  injectAutoFillMeta,\n} from './modules/seo/index.js'\nexport { buildSlugField, toSlug } from './modules/slug/index.js'\n// Storage — Cloudflare R2 media offload, configured from .env.\nexport { buildR2Storage } from './modules/storage/index.js'\n\nexport { ipalKit } from './plugin.js'\nexport type { IpalOptions } from './types.js'\n"],"names":["adminOnly","adminOnlyField","adminOrEditor","adminOrEditorField","adminOrSelf","authenticated","hasMinimumRole","isAdmin","isEditor","requireRole","requireRoleField","ROLE_HIERARCHY","getAnalyticsConfig","ACCEPT_ALL_CONSENT","CONSENT_CATEGORIES","CONSENT_COOKIE","CONSENT_MAX_AGE","CONSENT_VERSION","DEFAULT_CONSENT","getConsentTexts","parseConsent","REJECT_ALL_CONSENT","serializeConsent","setDefaultConsent","updateConsent","archiveFieldName","buildArchivePath","buildEntryPath","getArchiveEntries","parsePageParam","resolveRoute","graphAdapter","mailAdapter","panelSmtpAdapter","buildFormsPlugin","createContentHelpers","buildLocalizedPath","getDefaultLocale","getLocaleCodes","getLocaleDefinition","getLocalizedSlugs","isValidLocale","LOCALE_COOKIE_NAME","matchAcceptLanguage","negotiateLocale","switchLocalePath","createLocaleMiddleware","DEFAULT_MIDDLEWARE_MATCHER","normalizeFilename","normalizeFilenameHook","getNotificationTexts","NOTIFICATION_FALLBACK","resolveFormMessage","ALL_SYSTEM_PAGE_ROLES","getSystemPagePath","getGlobal","getSiteIntegrations","getSiteSettings","SITE_INTEGRATIONS_SLUG","SITE_SETTINGS_SLUG","buildSecurityHeaders","buildIconsMetadata","buildOrganizationJsonLd","validateFaviconField","buildHreflangAlternates","buildMetadata","composeTitle","buildAutoFillMetaHook","buildRobots","buildSitemapEntries","createMetadataGenerator","createPageMetadata","injectAutoFillMeta","buildSlugField","toSlug","buildR2Storage","ipalKit"],"mappings":"AACA,SACEA,SAAS,EACTC,cAAc,EACdC,aAAa,EACbC,kBAAkB,EAClBC,WAAW,EACXC,aAAa,EACbC,cAAc,EACdC,OAAO,EACPC,QAAQ,EACRC,WAAW,EACXC,gBAAgB,EAChBC,cAAc,QACT,4BAA2B;AAElC,SAASC,kBAAkB,QAAQ,+BAA8B;AACjE,SACEC,kBAAkB,EAClBC,kBAAkB,EAClBC,cAAc,EACdC,eAAe,EACfC,eAAe,EACfC,eAAe,EACfC,eAAe,EACfC,YAAY,EACZC,kBAAkB,EAClBC,gBAAgB,EAChBC,iBAAiB,EACjBC,aAAa,QACR,6BAA4B;AAOnC,SACEC,gBAAgB,EAChBC,gBAAgB,EAChBC,cAAc,EACdC,iBAAiB,EACjBC,cAAc,EACdC,YAAY,QACP,6BAA4B;AAEnC,SAASC,YAAY,QAAQ,kCAAiC;AAE9D,SAASC,WAAW,QAAQ,iCAAgC;AAE5D,4EAA4E;AAC5E,gFAAgF;AAChF,gFAAgF;AAChF,SAASC,gBAAgB,QAAQ,sCAAqC;AAEtE,SAASC,gBAAgB,QAAQ,uCAAsC;AAMvE,SAASC,oBAAoB,QAAQ,8BAA6B;AAElE,SACEC,kBAAkB,EAClBC,gBAAgB,EAChBC,cAAc,EACdC,mBAAmB,EACnBC,iBAAiB,EACjBC,aAAa,EACbC,kBAAkB,EAClBC,mBAAmB,EACnBC,eAAe,EACfC,gBAAgB,QACX,0BAAyB;AAEhC,SAASC,sBAAsB,EAAEC,0BAA0B,QAAQ,0BAAyB;AAC5F,sEAAsE;AACtE,SAASC,iBAAiB,EAAEC,qBAAqB,QAAQ,2BAA0B;AACnF,SACEC,oBAAoB,EACpBC,qBAAqB,EACrBC,kBAAkB,QACb,mCAAkC;AAOzC,SAASC,qBAAqB,EAAEC,iBAAiB,QAAQ,2BAA0B;AAEnF,SACEC,SAAS,EACTC,mBAAmB,EACnBC,eAAe,EACfC,sBAAsB,EACtBC,kBAAkB,QACb,6BAA4B;AACnC,SAASC,oBAAoB,QAAQ,8BAA6B;AAElE,SACEC,kBAAkB,EAClBC,uBAAuB,EACvBC,oBAAoB,QACf,yBAAwB;AAE/B,SAASC,uBAAuB,EAAEC,aAAa,EAAEC,YAAY,QAAQ,yBAAwB;AAE7F,SACEC,qBAAqB,EACrBC,WAAW,EACXC,mBAAmB,EACnBC,uBAAuB,EACvBC,kBAAkB,EAClBC,kBAAkB,QACb,yBAAwB;AAC/B,SAASC,cAAc,EAAEC,MAAM,QAAQ,0BAAyB;AAChE,+DAA+D;AAC/D,SAASC,cAAc,QAAQ,6BAA4B;AAE3D,SAASC,OAAO,QAAQ,cAAa"}
\ No newline at end of file
+{"version":3,"sources":["../src/index.ts"],"sourcesContent":["export type { AccessOption, Role } from './modules/access/index.js'\nexport {\n  adminOnly,\n  adminOnlyField,\n  adminOrEditor,\n  adminOrEditorField,\n  adminOrSelf,\n  authenticated,\n  hasMinimumRole,\n  isAdmin,\n  isEditor,\n  requireRole,\n  requireRoleField,\n  ROLE_HIERARCHY,\n} from './modules/access/index.js'\nexport type { AnalyticsConfig } from './modules/analytics/index.js'\nexport { getAnalyticsConfig } from './modules/analytics/index.js'\nexport {\n  ACCEPT_ALL_CONSENT,\n  CONSENT_CATEGORIES,\n  CONSENT_COOKIE,\n  CONSENT_MAX_AGE,\n  CONSENT_VERSION,\n  DEFAULT_CONSENT,\n  getConsentTexts,\n  parseConsent,\n  REJECT_ALL_CONSENT,\n  serializeConsent,\n  setDefaultConsent,\n  updateConsent,\n} from './modules/consent/index.js'\nexport type { ConsentCategory, ConsentState, ConsentTexts } from './modules/consent/index.js'\nexport type {\n  ContentCollectionOption,\n  ContentOption,\n  ResolvedRoute,\n} from './modules/content/index.js'\nexport {\n  archiveFieldName,\n  buildArchivePath,\n  buildEntryPath,\n  getArchiveEntries,\n  parsePageParam,\n  resolveRoute,\n} from './modules/content/index.js'\nexport type { ArchiveEntries } from './modules/content/index.js'\nexport { graphAdapter } from './modules/email/graphAdapter.js'\nexport type { GraphAdapterArgs } from './modules/email/graphAdapter.js'\nexport { mailAdapter } from './modules/email/mailAdapter.js'\nexport type { MailAdapterArgs } from './modules/email/mailAdapter.js'\n// Imported straight from the file, NOT from ./modules/email/index.js — that\n// barrel re-exports sendEmail, which imports 'server-only' and would crash when\n// Payload loads the config (or runs generate:importmap) as a plain Node script.\nexport { panelSmtpAdapter } from './modules/email/panelSmtpAdapter.js'\nexport type { PanelSmtpAdapterArgs } from './modules/email/panelSmtpAdapter.js'\nexport { buildFormsPlugin } from './modules/forms/formsPluginConfig.js'\nexport type {\n  FormsCollectionOverrides,\n  FormsFieldsOverride,\n  FormsOption,\n} from './modules/forms/types.js'\nexport { createContentHelpers } from './modules/frontend/index.js'\nexport type { I18nConfig, LocaleDefinition, LocalizedSlugs } from './modules/i18n/index.js'\nexport {\n  buildLocalizedPath,\n  getDefaultLocale,\n  getLocaleCodes,\n  getLocaleDefinition,\n  getLocalizedSlugs,\n  isValidLocale,\n  LOCALE_COOKIE_NAME,\n  matchAcceptLanguage,\n  negotiateLocale,\n  switchLocalePath,\n} from './modules/i18n/index.js'\nexport type { LocaleMiddlewareResult } from './modules/i18n/index.js'\nexport { createLocaleMiddleware, DEFAULT_MIDDLEWARE_MATCHER } from './modules/i18n/index.js'\n// Media — filename normalization hook for upload collections (Media).\nexport { normalizeFilename, normalizeFilenameHook } from './modules/media/index.js'\nexport {\n  getNotificationTexts,\n  NOTIFICATION_FALLBACK,\n  resolveFormMessage,\n} from './modules/notifications/index.js'\nexport type {\n  FormNotificationTexts,\n  NotificationsData,\n  NotificationTexts,\n} from './modules/notifications/index.js'\nexport type { PagesOption, SystemPageRole } from './modules/pages/index.js'\nexport { ALL_SYSTEM_PAGE_ROLES, getSystemPagePath } from './modules/pages/index.js'\nexport type { GlobalQueryOptions } from './modules/payload/index.js'\nexport {\n  getGlobal,\n  getSiteIntegrations,\n  getSiteSettings,\n  SITE_INTEGRATIONS_SLUG,\n  SITE_SETTINGS_SLUG,\n} from './modules/payload/index.js'\nexport { buildSecurityHeaders } from './modules/security/index.js'\nexport type { BuildSecurityHeadersArgs, SecurityHeader } from './modules/security/index.js'\nexport {\n  buildIconsMetadata,\n  buildOrganizationJsonLd,\n  validateFaviconField,\n} from './modules/seo/index.js'\n// Structured data (schema.org JSON-LD) — brand/sitelink signals for Google.\n// WebSite (+ optional SearchAction), BreadcrumbList (per page), SiteNavigation.\nexport {\n  buildBreadcrumbJsonLd,\n  buildSiteNavigationJsonLd,\n  buildWebSiteJsonLd,\n} from './modules/seo/index.js'\nexport type { PageMetadata, SeoMeta, SeoOption } from './modules/seo/index.js'\nexport { buildHreflangAlternates, buildMetadata, composeTitle } from './modules/seo/index.js'\nexport type { AutoFillMapping, RobotsRules, SitemapEntry } from './modules/seo/index.js'\nexport {\n  buildAutoFillMetaHook,\n  buildRobots,\n  buildSitemapEntries,\n  createMetadataGenerator,\n  createPageMetadata,\n  injectAutoFillMeta,\n} from './modules/seo/index.js'\nexport { buildSlugField, toSlug } from './modules/slug/index.js'\n// Storage — Cloudflare R2 media offload, configured from .env.\nexport { buildR2Storage } from './modules/storage/index.js'\n\nexport { ipalKit } from './plugin.js'\nexport type { IpalOptions } from './types.js'\n"],"names":["adminOnly","adminOnlyField","adminOrEditor","adminOrEditorField","adminOrSelf","authenticated","hasMinimumRole","isAdmin","isEditor","requireRole","requireRoleField","ROLE_HIERARCHY","getAnalyticsConfig","ACCEPT_ALL_CONSENT","CONSENT_CATEGORIES","CONSENT_COOKIE","CONSENT_MAX_AGE","CONSENT_VERSION","DEFAULT_CONSENT","getConsentTexts","parseConsent","REJECT_ALL_CONSENT","serializeConsent","setDefaultConsent","updateConsent","archiveFieldName","buildArchivePath","buildEntryPath","getArchiveEntries","parsePageParam","resolveRoute","graphAdapter","mailAdapter","panelSmtpAdapter","buildFormsPlugin","createContentHelpers","buildLocalizedPath","getDefaultLocale","getLocaleCodes","getLocaleDefinition","getLocalizedSlugs","isValidLocale","LOCALE_COOKIE_NAME","matchAcceptLanguage","negotiateLocale","switchLocalePath","createLocaleMiddleware","DEFAULT_MIDDLEWARE_MATCHER","normalizeFilename","normalizeFilenameHook","getNotificationTexts","NOTIFICATION_FALLBACK","resolveFormMessage","ALL_SYSTEM_PAGE_ROLES","getSystemPagePath","getGlobal","getSiteIntegrations","getSiteSettings","SITE_INTEGRATIONS_SLUG","SITE_SETTINGS_SLUG","buildSecurityHeaders","buildIconsMetadata","buildOrganizationJsonLd","validateFaviconField","buildBreadcrumbJsonLd","buildSiteNavigationJsonLd","buildWebSiteJsonLd","buildHreflangAlternates","buildMetadata","composeTitle","buildAutoFillMetaHook","buildRobots","buildSitemapEntries","createMetadataGenerator","createPageMetadata","injectAutoFillMeta","buildSlugField","toSlug","buildR2Storage","ipalKit"],"mappings":"AACA,SACEA,SAAS,EACTC,cAAc,EACdC,aAAa,EACbC,kBAAkB,EAClBC,WAAW,EACXC,aAAa,EACbC,cAAc,EACdC,OAAO,EACPC,QAAQ,EACRC,WAAW,EACXC,gBAAgB,EAChBC,cAAc,QACT,4BAA2B;AAElC,SAASC,kBAAkB,QAAQ,+BAA8B;AACjE,SACEC,kBAAkB,EAClBC,kBAAkB,EAClBC,cAAc,EACdC,eAAe,EACfC,eAAe,EACfC,eAAe,EACfC,eAAe,EACfC,YAAY,EACZC,kBAAkB,EAClBC,gBAAgB,EAChBC,iBAAiB,EACjBC,aAAa,QACR,6BAA4B;AAOnC,SACEC,gBAAgB,EAChBC,gBAAgB,EAChBC,cAAc,EACdC,iBAAiB,EACjBC,cAAc,EACdC,YAAY,QACP,6BAA4B;AAEnC,SAASC,YAAY,QAAQ,kCAAiC;AAE9D,SAASC,WAAW,QAAQ,iCAAgC;AAE5D,4EAA4E;AAC5E,gFAAgF;AAChF,gFAAgF;AAChF,SAASC,gBAAgB,QAAQ,sCAAqC;AAEtE,SAASC,gBAAgB,QAAQ,uCAAsC;AAMvE,SAASC,oBAAoB,QAAQ,8BAA6B;AAElE,SACEC,kBAAkB,EAClBC,gBAAgB,EAChBC,cAAc,EACdC,mBAAmB,EACnBC,iBAAiB,EACjBC,aAAa,EACbC,kBAAkB,EAClBC,mBAAmB,EACnBC,eAAe,EACfC,gBAAgB,QACX,0BAAyB;AAEhC,SAASC,sBAAsB,EAAEC,0BAA0B,QAAQ,0BAAyB;AAC5F,sEAAsE;AACtE,SAASC,iBAAiB,EAAEC,qBAAqB,QAAQ,2BAA0B;AACnF,SACEC,oBAAoB,EACpBC,qBAAqB,EACrBC,kBAAkB,QACb,mCAAkC;AAOzC,SAASC,qBAAqB,EAAEC,iBAAiB,QAAQ,2BAA0B;AAEnF,SACEC,SAAS,EACTC,mBAAmB,EACnBC,eAAe,EACfC,sBAAsB,EACtBC,kBAAkB,QACb,6BAA4B;AACnC,SAASC,oBAAoB,QAAQ,8BAA6B;AAElE,SACEC,kBAAkB,EAClBC,uBAAuB,EACvBC,oBAAoB,QACf,yBAAwB;AAC/B,4EAA4E;AAC5E,gFAAgF;AAChF,SACEC,qBAAqB,EACrBC,yBAAyB,EACzBC,kBAAkB,QACb,yBAAwB;AAE/B,SAASC,uBAAuB,EAAEC,aAAa,EAAEC,YAAY,QAAQ,yBAAwB;AAE7F,SACEC,qBAAqB,EACrBC,WAAW,EACXC,mBAAmB,EACnBC,uBAAuB,EACvBC,kBAAkB,EAClBC,kBAAkB,QACb,yBAAwB;AAC/B,SAASC,cAAc,EAAEC,MAAM,QAAQ,0BAAyB;AAChE,+DAA+D;AAC/D,SAASC,cAAc,QAAQ,6BAA4B;AAE3D,SAASC,OAAO,QAAQ,cAAa"}
\ No newline at end of file
diff --git a/dist/modules/seo/buildBreadcrumbJsonLd.d.ts b/dist/modules/seo/buildBreadcrumbJsonLd.d.ts
new file mode 100644
index 0000000..90e5eb3
--- /dev/null
+++ b/dist/modules/seo/buildBreadcrumbJsonLd.d.ts
@@ -0,0 +1,40 @@
+type Crumb = {
+    /** Visible name of the breadcrumb (e.g. 'Usługi'). */
+    name: string;
+    /** Absolute URL of this crumb (e.g. 'https://example.com/pl/uslugi'). */
+    url: string;
+};
+/**
+ * Builds BreadcrumbList JSON-LD (schema.org) for a page's position in the site
+ * hierarchy. Google can show breadcrumbs in the result (Dom › Usługi › Detailing)
+ * and uses them to understand structure — a signal that helps navigational
+ * results and sitelinks.
+ *
+ * Unlike Organization/WebSite (site-wide, root layout), breadcrumbs are
+ * PER-PAGE — build them from the page's ancestry and emit on that page:
+ *
+ *   import { buildBreadcrumbJsonLd } from '@intecion/ipal-kit'
+ *   const jsonLd = buildBreadcrumbJsonLd([
+ *     { name: 'Strona główna', url: `${base}/pl` },
+ *     { name: 'Usługi', url: `${base}/pl/uslugi` },
+ *     { name: 'Detailing', url: `${base}/pl/uslugi/detailing` },
+ *   ])
+ *   <script type="application/ld+json" ... />
+ *
+ * The crumb data comes from the page's real position (parent pages / URL path),
+ * NOT hardcoded. Derive it from the resolved route, not a static list.
+ *
+ * Returns null for an empty/single crumb list — a one-item breadcrumb isn't
+ * meaningful and shouldn't be emitted.
+ */
+export declare function buildBreadcrumbJsonLd(crumbs: Crumb[]): {
+    '@context': string;
+    '@type': string;
+    itemListElement: {
+        name: string;
+        '@type': string;
+        item: string;
+        position: number;
+    }[];
+} | null;
+export {};
diff --git a/dist/modules/seo/buildBreadcrumbJsonLd.js b/dist/modules/seo/buildBreadcrumbJsonLd.js
new file mode 100644
index 0000000..e3335b4
--- /dev/null
+++ b/dist/modules/seo/buildBreadcrumbJsonLd.js
@@ -0,0 +1,39 @@
+/**
+ * Builds BreadcrumbList JSON-LD (schema.org) for a page's position in the site
+ * hierarchy. Google can show breadcrumbs in the result (Dom › Usługi › Detailing)
+ * and uses them to understand structure — a signal that helps navigational
+ * results and sitelinks.
+ *
+ * Unlike Organization/WebSite (site-wide, root layout), breadcrumbs are
+ * PER-PAGE — build them from the page's ancestry and emit on that page:
+ *
+ *   import { buildBreadcrumbJsonLd } from '@intecion/ipal-kit'
+ *   const jsonLd = buildBreadcrumbJsonLd([
+ *     { name: 'Strona główna', url: `${base}/pl` },
+ *     { name: 'Usługi', url: `${base}/pl/uslugi` },
+ *     { name: 'Detailing', url: `${base}/pl/uslugi/detailing` },
+ *   ])
+ *   <script type="application/ld+json" ... />
+ *
+ * The crumb data comes from the page's real position (parent pages / URL path),
+ * NOT hardcoded. Derive it from the resolved route, not a static list.
+ *
+ * Returns null for an empty/single crumb list — a one-item breadcrumb isn't
+ * meaningful and shouldn't be emitted.
+ */ export function buildBreadcrumbJsonLd(crumbs) {
+    if (!crumbs || crumbs.length < 2) {
+        return null;
+    }
+    return {
+        '@context': 'https://schema.org',
+        '@type': 'BreadcrumbList',
+        itemListElement: crumbs.map((crumb, index)=>({
+                name: crumb.name,
+                '@type': 'ListItem',
+                item: crumb.url,
+                position: index + 1
+            }))
+    };
+}
+
+//# sourceMappingURL=buildBreadcrumbJsonLd.js.map
\ No newline at end of file
diff --git a/dist/modules/seo/buildBreadcrumbJsonLd.js.map b/dist/modules/seo/buildBreadcrumbJsonLd.js.map
new file mode 100644
index 0000000..f4050c6
--- /dev/null
+++ b/dist/modules/seo/buildBreadcrumbJsonLd.js.map
@@ -0,0 +1 @@
+{"version":3,"sources":["../../../src/modules/seo/buildBreadcrumbJsonLd.ts"],"sourcesContent":["type Crumb = {\n  /** Visible name of the breadcrumb (e.g. 'Usługi'). */\n  name: string\n  /** Absolute URL of this crumb (e.g. 'https://example.com/pl/uslugi'). */\n  url: string\n}\n\n/**\n * Builds BreadcrumbList JSON-LD (schema.org) for a page's position in the site\n * hierarchy. Google can show breadcrumbs in the result (Dom › Usługi › Detailing)\n * and uses them to understand structure — a signal that helps navigational\n * results and sitelinks.\n *\n * Unlike Organization/WebSite (site-wide, root layout), breadcrumbs are\n * PER-PAGE — build them from the page's ancestry and emit on that page:\n *\n *   import { buildBreadcrumbJsonLd } from '@intecion/ipal-kit'\n *   const jsonLd = buildBreadcrumbJsonLd([\n *     { name: 'Strona główna', url: `${base}/pl` },\n *     { name: 'Usługi', url: `${base}/pl/uslugi` },\n *     { name: 'Detailing', url: `${base}/pl/uslugi/detailing` },\n *   ])\n *   <script type=\"application/ld+json\" ... />\n *\n * The crumb data comes from the page's real position (parent pages / URL path),\n * NOT hardcoded. Derive it from the resolved route, not a static list.\n *\n * Returns null for an empty/single crumb list — a one-item breadcrumb isn't\n * meaningful and shouldn't be emitted.\n */\nexport function buildBreadcrumbJsonLd(crumbs: Crumb[]) {\n  if (!crumbs || crumbs.length < 2) {return null}\n\n  return {\n    '@context': 'https://schema.org',\n    '@type': 'BreadcrumbList',\n    itemListElement: crumbs.map((crumb, index) => ({\n      name: crumb.name,\n      '@type': 'ListItem',\n      item: crumb.url,\n      position: index + 1,\n    })),\n  }\n}\n"],"names":["buildBreadcrumbJsonLd","crumbs","length","itemListElement","map","crumb","index","name","item","url","position"],"mappings":"AAOA;;;;;;;;;;;;;;;;;;;;;;CAsBC,GACD,OAAO,SAASA,sBAAsBC,MAAe;IACnD,IAAI,CAACA,UAAUA,OAAOC,MAAM,GAAG,GAAG;QAAC,OAAO;IAAI;IAE9C,OAAO;QACL,YAAY;QACZ,SAAS;QACTC,iBAAiBF,OAAOG,GAAG,CAAC,CAACC,OAAOC,QAAW,CAAA;gBAC7CC,MAAMF,MAAME,IAAI;gBAChB,SAAS;gBACTC,MAAMH,MAAMI,GAAG;gBACfC,UAAUJ,QAAQ;YACpB,CAAA;IACF;AACF"}
\ No newline at end of file
diff --git a/dist/modules/seo/buildSiteNavigationJsonLd.d.ts b/dist/modules/seo/buildSiteNavigationJsonLd.d.ts
new file mode 100644
index 0000000..85285b8
--- /dev/null
+++ b/dist/modules/seo/buildSiteNavigationJsonLd.d.ts
@@ -0,0 +1,35 @@
+type NavItem = {
+    /** Visible label (e.g. 'Usługi'). */
+    name: string;
+    /** Absolute URL (e.g. 'https://example.com/pl/uslugi'). */
+    url: string;
+};
+/**
+ * Builds SiteNavigationElement JSON-LD (schema.org) from the main navigation —
+ * declares the site's primary nav as structured data. A weaker sitelinks signal
+ * than WebSite/breadcrumbs, but cheap: it tells Google which pages are the main
+ * navigation targets.
+ *
+ * Feed it the SAME nav items the header renders (from the panel/nav global), so
+ * the structured data matches the visible menu — not a separate hardcoded list.
+ *
+ *   import { buildSiteNavigationJsonLd } from '@intecion/ipal-kit'
+ *   const jsonLd = buildSiteNavigationJsonLd(
+ *     navItems.map(i => ({ name: i.label, url: `${base}${i.href}` }))
+ *   )
+ *   <script type="application/ld+json" ... />
+ *
+ * Emit once (site-wide, root layout). Data from the nav source, never hardcoded.
+ * Returns null for empty nav.
+ */
+export declare function buildSiteNavigationJsonLd(items: NavItem[]): {
+    '@context': string;
+    '@type': string;
+    itemListElement: {
+        name: string;
+        '@type': string;
+        position: number;
+        url: string;
+    }[];
+} | null;
+export {};
diff --git a/dist/modules/seo/buildSiteNavigationJsonLd.js b/dist/modules/seo/buildSiteNavigationJsonLd.js
new file mode 100644
index 0000000..64e9218
--- /dev/null
+++ b/dist/modules/seo/buildSiteNavigationJsonLd.js
@@ -0,0 +1,34 @@
+/**
+ * Builds SiteNavigationElement JSON-LD (schema.org) from the main navigation —
+ * declares the site's primary nav as structured data. A weaker sitelinks signal
+ * than WebSite/breadcrumbs, but cheap: it tells Google which pages are the main
+ * navigation targets.
+ *
+ * Feed it the SAME nav items the header renders (from the panel/nav global), so
+ * the structured data matches the visible menu — not a separate hardcoded list.
+ *
+ *   import { buildSiteNavigationJsonLd } from '@intecion/ipal-kit'
+ *   const jsonLd = buildSiteNavigationJsonLd(
+ *     navItems.map(i => ({ name: i.label, url: `${base}${i.href}` }))
+ *   )
+ *   <script type="application/ld+json" ... />
+ *
+ * Emit once (site-wide, root layout). Data from the nav source, never hardcoded.
+ * Returns null for empty nav.
+ */ export function buildSiteNavigationJsonLd(items) {
+    if (!items || items.length === 0) {
+        return null;
+    }
+    return {
+        '@context': 'https://schema.org',
+        '@type': 'ItemList',
+        itemListElement: items.map((item, index)=>({
+                name: item.name,
+                '@type': 'SiteNavigationElement',
+                position: index + 1,
+                url: item.url
+            }))
+    };
+}
+
+//# sourceMappingURL=buildSiteNavigationJsonLd.js.map
\ No newline at end of file
diff --git a/dist/modules/seo/buildSiteNavigationJsonLd.js.map b/dist/modules/seo/buildSiteNavigationJsonLd.js.map
new file mode 100644
index 0000000..82188be
--- /dev/null
+++ b/dist/modules/seo/buildSiteNavigationJsonLd.js.map
@@ -0,0 +1 @@
+{"version":3,"sources":["../../../src/modules/seo/buildSiteNavigationJsonLd.ts"],"sourcesContent":["type NavItem = {\n  /** Visible label (e.g. 'Usługi'). */\n  name: string\n  /** Absolute URL (e.g. 'https://example.com/pl/uslugi'). */\n  url: string\n}\n\n/**\n * Builds SiteNavigationElement JSON-LD (schema.org) from the main navigation —\n * declares the site's primary nav as structured data. A weaker sitelinks signal\n * than WebSite/breadcrumbs, but cheap: it tells Google which pages are the main\n * navigation targets.\n *\n * Feed it the SAME nav items the header renders (from the panel/nav global), so\n * the structured data matches the visible menu — not a separate hardcoded list.\n *\n *   import { buildSiteNavigationJsonLd } from '@intecion/ipal-kit'\n *   const jsonLd = buildSiteNavigationJsonLd(\n *     navItems.map(i => ({ name: i.label, url: `${base}${i.href}` }))\n *   )\n *   <script type=\"application/ld+json\" ... />\n *\n * Emit once (site-wide, root layout). Data from the nav source, never hardcoded.\n * Returns null for empty nav.\n */\nexport function buildSiteNavigationJsonLd(items: NavItem[]) {\n  if (!items || items.length === 0) {return null}\n\n  return {\n    '@context': 'https://schema.org',\n    '@type': 'ItemList',\n    itemListElement: items.map((item, index) => ({\n      name: item.name,\n      '@type': 'SiteNavigationElement',\n      position: index + 1,\n      url: item.url,\n    })),\n  }\n}\n"],"names":["buildSiteNavigationJsonLd","items","length","itemListElement","map","item","index","name","position","url"],"mappings":"AAOA;;;;;;;;;;;;;;;;;CAiBC,GACD,OAAO,SAASA,0BAA0BC,KAAgB;IACxD,IAAI,CAACA,SAASA,MAAMC,MAAM,KAAK,GAAG;QAAC,OAAO;IAAI;IAE9C,OAAO;QACL,YAAY;QACZ,SAAS;QACTC,iBAAiBF,MAAMG,GAAG,CAAC,CAACC,MAAMC,QAAW,CAAA;gBAC3CC,MAAMF,KAAKE,IAAI;gBACf,SAAS;gBACTC,UAAUF,QAAQ;gBAClBG,KAAKJ,KAAKI,GAAG;YACf,CAAA;IACF;AACF"}
\ No newline at end of file
diff --git a/dist/modules/seo/buildWebSiteJsonLd.d.ts b/dist/modules/seo/buildWebSiteJsonLd.d.ts
new file mode 100644
index 0000000..3e32b4c
--- /dev/null
+++ b/dist/modules/seo/buildWebSiteJsonLd.d.ts
@@ -0,0 +1,55 @@
+type SearchActionConfig = {
+    /**
+     * URL template for site search, with {search_term_string} placeholder.
+     * e.g. 'https://example.com/szukaj?q={search_term_string}'. Only include if
+     * the site actually HAS a working search page — a SearchAction pointing at a
+     * non-existent search does more harm than good.
+     */
+    target: string;
+};
+type WebSiteJsonLdArgs = {
+    /** Site name (from panel — siteName). */
+    name: string;
+    /**
+     * Optional site search. Enables the "sitelinks searchbox" — a search field
+     * Google may show under the brand result. Only pass when a real search page
+     * exists. Omit entirely otherwise.
+     */
+    search?: SearchActionConfig;
+    /** Absolute site URL (https://…). */
+    url: string;
+};
+/**
+ * Builds WebSite JSON-LD (schema.org). Two jobs:
+ *  - Declares the site + name (helps Google associate brand queries with the site).
+ *  - Optionally declares a SearchAction, which is what can produce the "sitelinks
+ *    searchbox" (a search field under the brand result in Google).
+ *
+ * IMPORTANT — sitelinks (the sub-links under a result) CANNOT be forced. No
+ * schema guarantees them; Google generates them algorithmically from site
+ * structure, internal links, clear titles, and ranking. This schema is a SIGNAL
+ * that improves the odds and can enable the searchbox — not a switch. Manage
+ * expectations accordingly (see docs/seo.md).
+ *
+ * Emit once in the ROOT layout (site-wide), from panel data:
+ *
+ *   import { buildWebSiteJsonLd } from '@intecion/ipal-kit'
+ *   const jsonLd = buildWebSiteJsonLd({ name: settings.siteName, url: baseUrl })
+ *   <script type="application/ld+json"
+ *     dangerouslySetInnerHTML={{ __html: JSON.stringify(jsonLd) }} />
+ */
+export declare function buildWebSiteJsonLd({ name, search, url }: WebSiteJsonLdArgs): {
+    potentialAction?: {
+        '@type': string;
+        'query-input': string;
+        target: {
+            '@type': string;
+            urlTemplate: string;
+        };
+    } | undefined;
+    name: string;
+    '@context': string;
+    '@type': string;
+    url: string;
+};
+export {};
diff --git a/dist/modules/seo/buildWebSiteJsonLd.js b/dist/modules/seo/buildWebSiteJsonLd.js
new file mode 100644
index 0000000..8c01edb
--- /dev/null
+++ b/dist/modules/seo/buildWebSiteJsonLd.js
@@ -0,0 +1,38 @@
+/**
+ * Builds WebSite JSON-LD (schema.org). Two jobs:
+ *  - Declares the site + name (helps Google associate brand queries with the site).
+ *  - Optionally declares a SearchAction, which is what can produce the "sitelinks
+ *    searchbox" (a search field under the brand result in Google).
+ *
+ * IMPORTANT — sitelinks (the sub-links under a result) CANNOT be forced. No
+ * schema guarantees them; Google generates them algorithmically from site
+ * structure, internal links, clear titles, and ranking. This schema is a SIGNAL
+ * that improves the odds and can enable the searchbox — not a switch. Manage
+ * expectations accordingly (see docs/seo.md).
+ *
+ * Emit once in the ROOT layout (site-wide), from panel data:
+ *
+ *   import { buildWebSiteJsonLd } from '@intecion/ipal-kit'
+ *   const jsonLd = buildWebSiteJsonLd({ name: settings.siteName, url: baseUrl })
+ *   <script type="application/ld+json"
+ *     dangerouslySetInnerHTML={{ __html: JSON.stringify(jsonLd) }} />
+ */ export function buildWebSiteJsonLd({ name, search, url }) {
+    return {
+        name,
+        '@context': 'https://schema.org',
+        '@type': 'WebSite',
+        url,
+        ...search ? {
+            potentialAction: {
+                '@type': 'SearchAction',
+                'query-input': 'required name=search_term_string',
+                target: {
+                    '@type': 'EntryPoint',
+                    urlTemplate: search.target
+                }
+            }
+        } : {}
+    };
+}
+
+//# sourceMappingURL=buildWebSiteJsonLd.js.map
\ No newline at end of file
diff --git a/dist/modules/seo/buildWebSiteJsonLd.js.map b/dist/modules/seo/buildWebSiteJsonLd.js.map
new file mode 100644
index 0000000..f3055c6
--- /dev/null
+++ b/dist/modules/seo/buildWebSiteJsonLd.js.map
@@ -0,0 +1 @@
+{"version":3,"sources":["../../../src/modules/seo/buildWebSiteJsonLd.ts"],"sourcesContent":["type SearchActionConfig = {\n  /**\n   * URL template for site search, with {search_term_string} placeholder.\n   * e.g. 'https://example.com/szukaj?q={search_term_string}'. Only include if\n   * the site actually HAS a working search page — a SearchAction pointing at a\n   * non-existent search does more harm than good.\n   */\n  target: string\n}\n\ntype WebSiteJsonLdArgs = {\n  /** Site name (from panel — siteName). */\n  name: string\n  /**\n   * Optional site search. Enables the \"sitelinks searchbox\" — a search field\n   * Google may show under the brand result. Only pass when a real search page\n   * exists. Omit entirely otherwise.\n   */\n  search?: SearchActionConfig\n  /** Absolute site URL (https://…). */\n  url: string\n}\n\n/**\n * Builds WebSite JSON-LD (schema.org). Two jobs:\n *  - Declares the site + name (helps Google associate brand queries with the site).\n *  - Optionally declares a SearchAction, which is what can produce the \"sitelinks\n *    searchbox\" (a search field under the brand result in Google).\n *\n * IMPORTANT — sitelinks (the sub-links under a result) CANNOT be forced. No\n * schema guarantees them; Google generates them algorithmically from site\n * structure, internal links, clear titles, and ranking. This schema is a SIGNAL\n * that improves the odds and can enable the searchbox — not a switch. Manage\n * expectations accordingly (see docs/seo.md).\n *\n * Emit once in the ROOT layout (site-wide), from panel data:\n *\n *   import { buildWebSiteJsonLd } from '@intecion/ipal-kit'\n *   const jsonLd = buildWebSiteJsonLd({ name: settings.siteName, url: baseUrl })\n *   <script type=\"application/ld+json\"\n *     dangerouslySetInnerHTML={{ __html: JSON.stringify(jsonLd) }} />\n */\nexport function buildWebSiteJsonLd({ name, search, url }: WebSiteJsonLdArgs) {\n  return {\n    name,\n    '@context': 'https://schema.org',\n    '@type': 'WebSite',\n    url,\n    ...(search\n      ? {\n          potentialAction: {\n            '@type': 'SearchAction',\n            'query-input': 'required name=search_term_string',\n            target: {\n              '@type': 'EntryPoint',\n              urlTemplate: search.target,\n            },\n          },\n        }\n      : {}),\n  }\n}\n"],"names":["buildWebSiteJsonLd","name","search","url","potentialAction","target","urlTemplate"],"mappings":"AAuBA;;;;;;;;;;;;;;;;;;CAkBC,GACD,OAAO,SAASA,mBAAmB,EAAEC,IAAI,EAAEC,MAAM,EAAEC,GAAG,EAAqB;IACzE,OAAO;QACLF;QACA,YAAY;QACZ,SAAS;QACTE;QACA,GAAID,SACA;YACEE,iBAAiB;gBACf,SAAS;gBACT,eAAe;gBACfC,QAAQ;oBACN,SAAS;oBACTC,aAAaJ,OAAOG,MAAM;gBAC5B;YACF;QACF,IACA,CAAC,CAAC;IACR;AACF"}
\ No newline at end of file
diff --git a/dist/modules/seo/hreflang.d.ts b/dist/modules/seo/hreflang.d.ts
index f559f0d..ee7756a 100644
--- a/dist/modules/seo/hreflang.d.ts
+++ b/dist/modules/seo/hreflang.d.ts
@@ -15,20 +15,28 @@ type BuildHreflangArgs = {
     slugs: LocalizedSlugs;
 };
 /**
- * Builds a map of locale → URL for hreflang alternate links, suitable for
  * Next.js Metadata `alternates.languages`.
  *
  * Bridges SEO and i18n: for each configured locale that the document has a
  * slug in, it produces the locale-aware path (via buildLocalizedPath),
  * optionally prefixed with an absolute origin.
  *
+ * Also emits `x-default` pointing at the default locale — the version Google
+ * serves when the user's language/region matches no hreflang, and the fallback
+ * when the root ('/') redirect is ambiguous (Googlebot with no/foreign
+ * Accept-Language).
+ *
  * @example
  * buildHreflangAlternates({
  *   slugs: { pl: 'o-nas', en: 'about' },
  *   config,
  *   baseUrl: 'https://example.com',
  * })
- * // → { pl: 'https://example.com/pl/o-nas', en: 'https://example.com/en/about' }
+ * // → {
+ * //   pl: 'https://example.com/pl/o-nas',
+ * //   en: 'https://example.com/en/about',
+ * //   'x-default': 'https://example.com/pl/o-nas',
+ * // }
  */
 export declare function buildHreflangAlternates({ baseUrl, config, homeSlug, prefix, slugs, }: BuildHreflangArgs): Record<string, string>;
 export {};
diff --git a/dist/modules/seo/hreflang.js b/dist/modules/seo/hreflang.js
index 0a74d4e..d122773 100644
--- a/dist/modules/seo/hreflang.js
+++ b/dist/modules/seo/hreflang.js
@@ -1,19 +1,27 @@
-import { buildLocalizedPath, getLocaleCodes } from '../i18n/index.js';
+import { buildLocalizedPath, getDefaultLocale, getLocaleCodes } from '../i18n/index.js';
 /**
- * Builds a map of locale → URL for hreflang alternate links, suitable for
  * Next.js Metadata `alternates.languages`.
  *
  * Bridges SEO and i18n: for each configured locale that the document has a
  * slug in, it produces the locale-aware path (via buildLocalizedPath),
  * optionally prefixed with an absolute origin.
  *
+ * Also emits `x-default` pointing at the default locale — the version Google
+ * serves when the user's language/region matches no hreflang, and the fallback
+ * when the root ('/') redirect is ambiguous (Googlebot with no/foreign
+ * Accept-Language).
+ *
  * @example
  * buildHreflangAlternates({
  *   slugs: { pl: 'o-nas', en: 'about' },
  *   config,
  *   baseUrl: 'https://example.com',
  * })
- * // → { pl: 'https://example.com/pl/o-nas', en: 'https://example.com/en/about' }
+ * // → {
+ * //   pl: 'https://example.com/pl/o-nas',
+ * //   en: 'https://example.com/en/about',
+ * //   'x-default': 'https://example.com/pl/o-nas',
+ * // }
  */ export function buildHreflangAlternates({ baseUrl, config, homeSlug = 'home', prefix, slugs }) {
     const origin = baseUrl?.replace(/\/$/, '') ?? '';
     const alternates = {};
@@ -29,6 +37,15 @@ import { buildLocalizedPath, getLocaleCodes } from '../i18n/index.js';
             alternates[locale] = `${origin}${path}`;
         }
     }
+    // x-default: the version Google serves when the user's language/region doesn't
+    // match any hreflang — and, crucially here, the fallback when the root ('/')
+    // redirect is ambiguous (Googlebot with no/foreign Accept-Language). Point it
+    // at the default locale (the primary market) so search shows that version by
+    // default instead of guessing. Only set when the default locale has a URL.
+    const defaultLocalePath = alternates[getDefaultLocale(config)];
+    if (defaultLocalePath) {
+        alternates['x-default'] = defaultLocalePath;
+    }
     return alternates;
 }
 
diff --git a/dist/modules/seo/hreflang.js.map b/dist/modules/seo/hreflang.js.map
index 4ca97fe..677a9db 100644
--- a/dist/modules/seo/hreflang.js.map
+++ b/dist/modules/seo/hreflang.js.map
@@ -1 +1 @@
-{"version":3,"sources":["../../../src/modules/seo/hreflang.ts"],"sourcesContent":["import type { I18nConfig, LocalizedSlugs } from '../i18n/index.js'\n\nimport { buildLocalizedPath, getLocaleCodes } from '../i18n/index.js'\n\ntype BuildHreflangArgs = {\n  /** Absolute site origin, e.g. 'https://example.com'. Omit for relative paths. */\n  baseUrl?: string\n  config: I18nConfig\n  /** Home slug that collapses to the locale root. Defaults to 'home'. */\n  homeSlug?: string\n  /**\n   * Localized segment the document lives under (an archive page's slugs),\n   * e.g. { pl: 'artykuly', en: 'articles' }. Locales missing from the prefix\n   * are omitted — an entry with no archive in that language has no URL there.\n   */\n  prefix?: LocalizedSlugs\n  /** slug per locale for the current document, e.g. { pl: 'o-nas', en: 'about' } */\n  slugs: LocalizedSlugs\n}\n\n/**\n * Builds a map of locale → URL for hreflang alternate links, suitable for\n * Next.js Metadata `alternates.languages`.\n *\n * Bridges SEO and i18n: for each configured locale that the document has a\n * slug in, it produces the locale-aware path (via buildLocalizedPath),\n * optionally prefixed with an absolute origin.\n *\n * @example\n * buildHreflangAlternates({\n *   slugs: { pl: 'o-nas', en: 'about' },\n *   config,\n *   baseUrl: 'https://example.com',\n * })\n * // → { pl: 'https://example.com/pl/o-nas', en: 'https://example.com/en/about' }\n */\nexport function buildHreflangAlternates({\n  baseUrl,\n  config,\n  homeSlug = 'home',\n  prefix,\n  slugs,\n}: BuildHreflangArgs): Record<string, string> {\n  const origin = baseUrl?.replace(/\\/$/, '') ?? ''\n  const alternates: Record<string, string> = {}\n\n  for (const locale of getLocaleCodes(config)) {\n    const path = buildLocalizedPath({ config, homeSlug, locale, prefix, slugs })\n    if (path) {\n      alternates[locale] = `${origin}${path}`\n    }\n  }\n\n  return alternates\n}\n"],"names":["buildLocalizedPath","getLocaleCodes","buildHreflangAlternates","baseUrl","config","homeSlug","prefix","slugs","origin","replace","alternates","locale","path"],"mappings":"AAEA,SAASA,kBAAkB,EAAEC,cAAc,QAAQ,mBAAkB;AAkBrE;;;;;;;;;;;;;;;CAeC,GACD,OAAO,SAASC,wBAAwB,EACtCC,OAAO,EACPC,MAAM,EACNC,WAAW,MAAM,EACjBC,MAAM,EACNC,KAAK,EACa;IAClB,MAAMC,SAASL,SAASM,QAAQ,OAAO,OAAO;IAC9C,MAAMC,aAAqC,CAAC;IAE5C,KAAK,MAAMC,UAAUV,eAAeG,QAAS;QAC3C,MAAMQ,OAAOZ,mBAAmB;YAAEI;YAAQC;YAAUM;YAAQL;YAAQC;QAAM;QAC1E,IAAIK,MAAM;YACRF,UAAU,CAACC,OAAO,GAAG,GAAGH,SAASI,MAAM;QACzC;IACF;IAEA,OAAOF;AACT"}
\ No newline at end of file
+{"version":3,"sources":["../../../src/modules/seo/hreflang.ts"],"sourcesContent":["import type { I18nConfig, LocalizedSlugs } from '../i18n/index.js'\n\nimport { buildLocalizedPath, getDefaultLocale, getLocaleCodes } from '../i18n/index.js'\n\ntype BuildHreflangArgs = {\n  /** Absolute site origin, e.g. 'https://example.com'. Omit for relative paths. */\n  baseUrl?: string\n  config: I18nConfig\n  /** Home slug that collapses to the locale root. Defaults to 'home'. */\n  homeSlug?: string\n  /**\n   * Localized segment the document lives under (an archive page's slugs),\n   * e.g. { pl: 'artykuly', en: 'articles' }. Locales missing from the prefix\n   * are omitted — an entry with no archive in that language has no URL there.\n   */\n  prefix?: LocalizedSlugs\n  /** slug per locale for the current document, e.g. { pl: 'o-nas', en: 'about' } */\n  slugs: LocalizedSlugs\n}\n\n/**\n * Next.js Metadata `alternates.languages`.\n *\n * Bridges SEO and i18n: for each configured locale that the document has a\n * slug in, it produces the locale-aware path (via buildLocalizedPath),\n * optionally prefixed with an absolute origin.\n *\n * Also emits `x-default` pointing at the default locale — the version Google\n * serves when the user's language/region matches no hreflang, and the fallback\n * when the root ('/') redirect is ambiguous (Googlebot with no/foreign\n * Accept-Language).\n *\n * @example\n * buildHreflangAlternates({\n *   slugs: { pl: 'o-nas', en: 'about' },\n *   config,\n *   baseUrl: 'https://example.com',\n * })\n * // → {\n * //   pl: 'https://example.com/pl/o-nas',\n * //   en: 'https://example.com/en/about',\n * //   'x-default': 'https://example.com/pl/o-nas',\n * // }\n */\nexport function buildHreflangAlternates({\n  baseUrl,\n  config,\n  homeSlug = 'home',\n  prefix,\n  slugs,\n}: BuildHreflangArgs): Record<string, string> {\n  const origin = baseUrl?.replace(/\\/$/, '') ?? ''\n  const alternates: Record<string, string> = {}\n\n  for (const locale of getLocaleCodes(config)) {\n    const path = buildLocalizedPath({ config, homeSlug, locale, prefix, slugs })\n    if (path) {\n      alternates[locale] = `${origin}${path}`\n    }\n  }\n\n  // x-default: the version Google serves when the user's language/region doesn't\n  // match any hreflang — and, crucially here, the fallback when the root ('/')\n  // redirect is ambiguous (Googlebot with no/foreign Accept-Language). Point it\n  // at the default locale (the primary market) so search shows that version by\n  // default instead of guessing. Only set when the default locale has a URL.\n  const defaultLocalePath = alternates[getDefaultLocale(config)]\n  if (defaultLocalePath) {\n    alternates['x-default'] = defaultLocalePath\n  }\n\n  return alternates\n}\n"],"names":["buildLocalizedPath","getDefaultLocale","getLocaleCodes","buildHreflangAlternates","baseUrl","config","homeSlug","prefix","slugs","origin","replace","alternates","locale","path","defaultLocalePath"],"mappings":"AAEA,SAASA,kBAAkB,EAAEC,gBAAgB,EAAEC,cAAc,QAAQ,mBAAkB;AAkBvF;;;;;;;;;;;;;;;;;;;;;;;CAuBC,GACD,OAAO,SAASC,wBAAwB,EACtCC,OAAO,EACPC,MAAM,EACNC,WAAW,MAAM,EACjBC,MAAM,EACNC,KAAK,EACa;IAClB,MAAMC,SAASL,SAASM,QAAQ,OAAO,OAAO;IAC9C,MAAMC,aAAqC,CAAC;IAE5C,KAAK,MAAMC,UAAUV,eAAeG,QAAS;QAC3C,MAAMQ,OAAOb,mBAAmB;YAAEK;YAAQC;YAAUM;YAAQL;YAAQC;QAAM;QAC1E,IAAIK,MAAM;YACRF,UAAU,CAACC,OAAO,GAAG,GAAGH,SAASI,MAAM;QACzC;IACF;IAEA,+EAA+E;IAC/E,6EAA6E;IAC7E,8EAA8E;IAC9E,6EAA6E;IAC7E,2EAA2E;IAC3E,MAAMC,oBAAoBH,UAAU,CAACV,iBAAiBI,QAAQ;IAC9D,IAAIS,mBAAmB;QACrBH,UAAU,CAAC,YAAY,GAAGG;IAC5B;IAEA,OAAOH;AACT"}
\ No newline at end of file
diff --git a/dist/modules/seo/index.d.ts b/dist/modules/seo/index.d.ts
index fd06c04..5072e81 100644
--- a/dist/modules/seo/index.d.ts
+++ b/dist/modules/seo/index.d.ts
@@ -1,5 +1,6 @@
 export { buildAutoFillMetaHook } from './autoFillMeta.js';
 export type { AutoFillMapping } from './autoFillMeta.js';
+export { buildBreadcrumbJsonLd } from './buildBreadcrumbJsonLd.js';
 export { buildIconsMetadata } from './buildIconsMetadata.js';
 export { buildMetadata } from './buildMetadata.js';
 export type { PageMetadata } from './buildMetadata.js';
@@ -8,6 +9,8 @@ export { buildRobots } from './buildRobots.js';
 export type { RobotsRules } from './buildRobots.js';
 export { buildSitemapEntries } from './buildSitemapEntries.js';
 export type { SitemapEntry } from './buildSitemapEntries.js';
+export { buildSiteNavigationJsonLd } from './buildSiteNavigationJsonLd.js';
+export { buildWebSiteJsonLd } from './buildWebSiteJsonLd.js';
 export { composeTitle } from './composeTitle.js';
 export type { TitleOrder } from './composeTitle.js';
 export { createMetadataGenerator } from './createMetadataGenerator.js';
diff --git a/dist/modules/seo/index.js b/dist/modules/seo/index.js
index d07a4ec..9b1e53d 100644
--- a/dist/modules/seo/index.js
+++ b/dist/modules/seo/index.js
@@ -1,9 +1,12 @@
 export { buildAutoFillMetaHook } from './autoFillMeta.js';
+export { buildBreadcrumbJsonLd } from './buildBreadcrumbJsonLd.js';
 export { buildIconsMetadata } from './buildIconsMetadata.js';
 export { buildMetadata } from './buildMetadata.js';
 export { buildOrganizationJsonLd } from './buildOrganizationJsonLd.js';
 export { buildRobots } from './buildRobots.js';
 export { buildSitemapEntries } from './buildSitemapEntries.js';
+export { buildSiteNavigationJsonLd } from './buildSiteNavigationJsonLd.js';
+export { buildWebSiteJsonLd } from './buildWebSiteJsonLd.js';
 export { composeTitle } from './composeTitle.js';
 export { createMetadataGenerator } from './createMetadataGenerator.js';
 export { createPageMetadata } from './createPageMetadata.js';
diff --git a/dist/modules/seo/index.js.map b/dist/modules/seo/index.js.map
index d96211c..4a74dd8 100644
--- a/dist/modules/seo/index.js.map
+++ b/dist/modules/seo/index.js.map
@@ -1 +1 @@
-{"version":3,"sources":["../../../src/modules/seo/index.ts"],"sourcesContent":["export { buildAutoFillMetaHook } from './autoFillMeta.js'\nexport type { AutoFillMapping } from './autoFillMeta.js'\nexport { buildIconsMetadata } from './buildIconsMetadata.js'\nexport { buildMetadata } from './buildMetadata.js'\nexport type { PageMetadata } from './buildMetadata.js'\nexport { buildOrganizationJsonLd } from './buildOrganizationJsonLd.js'\nexport { buildRobots } from './buildRobots.js'\nexport type { RobotsRules } from './buildRobots.js'\nexport { buildSitemapEntries } from './buildSitemapEntries.js'\nexport type { SitemapEntry } from './buildSitemapEntries.js'\nexport { composeTitle } from './composeTitle.js'\nexport type { TitleOrder } from './composeTitle.js'\nexport { createMetadataGenerator } from './createMetadataGenerator.js'\nexport { createPageMetadata } from './createPageMetadata.js'\nexport { buildHreflangAlternates } from './hreflang.js'\nexport { injectAutoFillMeta } from './injectAutoFillMeta.js'\nexport { injectSeoTabs } from './injectSeoTabs.js'\nexport { readSiteMetaConfig } from './readSiteMetaConfig.js'\nexport type { SiteMetaConfig } from './readSiteMetaConfig.js'\nexport { buildSeoPlugin } from './seoPluginConfig.js'\nexport { slugsAcrossLocales } from './slugsAcrossLocales.js'\nexport type { SeoMeta, SeoOption } from './types.js'\nexport { validateFaviconField } from './validateFavicon.js'\n"],"names":["buildAutoFillMetaHook","buildIconsMetadata","buildMetadata","buildOrganizationJsonLd","buildRobots","buildSitemapEntries","composeTitle","createMetadataGenerator","createPageMetadata","buildHreflangAlternates","injectAutoFillMeta","injectSeoTabs","readSiteMetaConfig","buildSeoPlugin","slugsAcrossLocales","validateFaviconField"],"mappings":"AAAA,SAASA,qBAAqB,QAAQ,oBAAmB;AAEzD,SAASC,kBAAkB,QAAQ,0BAAyB;AAC5D,SAASC,aAAa,QAAQ,qBAAoB;AAElD,SAASC,uBAAuB,QAAQ,+BAA8B;AACtE,SAASC,WAAW,QAAQ,mBAAkB;AAE9C,SAASC,mBAAmB,QAAQ,2BAA0B;AAE9D,SAASC,YAAY,QAAQ,oBAAmB;AAEhD,SAASC,uBAAuB,QAAQ,+BAA8B;AACtE,SAASC,kBAAkB,QAAQ,0BAAyB;AAC5D,SAASC,uBAAuB,QAAQ,gBAAe;AACvD,SAASC,kBAAkB,QAAQ,0BAAyB;AAC5D,SAASC,aAAa,QAAQ,qBAAoB;AAClD,SAASC,kBAAkB,QAAQ,0BAAyB;AAE5D,SAASC,cAAc,QAAQ,uBAAsB;AACrD,SAASC,kBAAkB,QAAQ,0BAAyB;AAE5D,SAASC,oBAAoB,QAAQ,uBAAsB"}
\ No newline at end of file
+{"version":3,"sources":["../../../src/modules/seo/index.ts"],"sourcesContent":["export { buildAutoFillMetaHook } from './autoFillMeta.js'\nexport type { AutoFillMapping } from './autoFillMeta.js'\nexport { buildBreadcrumbJsonLd } from './buildBreadcrumbJsonLd.js'\nexport { buildIconsMetadata } from './buildIconsMetadata.js'\nexport { buildMetadata } from './buildMetadata.js'\nexport type { PageMetadata } from './buildMetadata.js'\nexport { buildOrganizationJsonLd } from './buildOrganizationJsonLd.js'\nexport { buildRobots } from './buildRobots.js'\nexport type { RobotsRules } from './buildRobots.js'\nexport { buildSitemapEntries } from './buildSitemapEntries.js'\nexport type { SitemapEntry } from './buildSitemapEntries.js'\nexport { buildSiteNavigationJsonLd } from './buildSiteNavigationJsonLd.js'\nexport { buildWebSiteJsonLd } from './buildWebSiteJsonLd.js'\nexport { composeTitle } from './composeTitle.js'\nexport type { TitleOrder } from './composeTitle.js'\nexport { createMetadataGenerator } from './createMetadataGenerator.js'\nexport { createPageMetadata } from './createPageMetadata.js'\nexport { buildHreflangAlternates } from './hreflang.js'\nexport { injectAutoFillMeta } from './injectAutoFillMeta.js'\nexport { injectSeoTabs } from './injectSeoTabs.js'\nexport { readSiteMetaConfig } from './readSiteMetaConfig.js'\nexport type { SiteMetaConfig } from './readSiteMetaConfig.js'\nexport { buildSeoPlugin } from './seoPluginConfig.js'\nexport { slugsAcrossLocales } from './slugsAcrossLocales.js'\nexport type { SeoMeta, SeoOption } from './types.js'\nexport { validateFaviconField } from './validateFavicon.js'\n"],"names":["buildAutoFillMetaHook","buildBreadcrumbJsonLd","buildIconsMetadata","buildMetadata","buildOrganizationJsonLd","buildRobots","buildSitemapEntries","buildSiteNavigationJsonLd","buildWebSiteJsonLd","composeTitle","createMetadataGenerator","createPageMetadata","buildHreflangAlternates","injectAutoFillMeta","injectSeoTabs","readSiteMetaConfig","buildSeoPlugin","slugsAcrossLocales","validateFaviconField"],"mappings":"AAAA,SAASA,qBAAqB,QAAQ,oBAAmB;AAEzD,SAASC,qBAAqB,QAAQ,6BAA4B;AAClE,SAASC,kBAAkB,QAAQ,0BAAyB;AAC5D,SAASC,aAAa,QAAQ,qBAAoB;AAElD,SAASC,uBAAuB,QAAQ,+BAA8B;AACtE,SAASC,WAAW,QAAQ,mBAAkB;AAE9C,SAASC,mBAAmB,QAAQ,2BAA0B;AAE9D,SAASC,yBAAyB,QAAQ,iCAAgC;AAC1E,SAASC,kBAAkB,QAAQ,0BAAyB;AAC5D,SAASC,YAAY,QAAQ,oBAAmB;AAEhD,SAASC,uBAAuB,QAAQ,+BAA8B;AACtE,SAASC,kBAAkB,QAAQ,0BAAyB;AAC5D,SAASC,uBAAuB,QAAQ,gBAAe;AACvD,SAASC,kBAAkB,QAAQ,0BAAyB;AAC5D,SAASC,aAAa,QAAQ,qBAAoB;AAClD,SAASC,kBAAkB,QAAQ,0BAAyB;AAE5D,SAASC,cAAc,QAAQ,uBAAsB;AACrD,SAASC,kBAAkB,QAAQ,0BAAyB;AAE5D,SAASC,oBAAoB,QAAQ,uBAAsB"}
\ No newline at end of file
diff --git a/docs/seo.md b/docs/seo.md
index 243f256..aabb63f 100644
--- a/docs/seo.md
+++ b/docs/seo.md
@@ -254,6 +254,19 @@ części — dodasz, gdyby realnie było ich tyle. Jedna sitemapa wystarcza do ~
 Favicon i structured data wpływają na to, jak strona wygląda w wynikach Google.
 Plugin generuje jedno i drugie z panelu — projekt tylko wpina w root layout.
 
+### Favicon — format: PNG, nie SVG (ważne)
+
+**Dla Google użyj PNG (≥48×48), nie SVG.** Zweryfikowane: Google niezawodnie
+wspiera PNG i ICO, ale **SVG w wynikach Google jest zawodny** — często pokazuje
+glob mimo że w karcie przeglądarki favicon renderuje się dobrze. Oficjalna
+dokumentacja Google nie wymienia SVG. Jeśli zależy Ci na faviconie w wyszukiwarce
+— wgraj PNG.
+
+- **PNG ≥48×48** (idealnie 96 lub 192), kwadratowy → działa w Google ✓
+- **SVG** → działa w przeglądarce, ale w Google glob (zawodne) ✗
+- Walidacja pola favicon OSTRZEGA, gdy wgrasz SVG (żebyś wiedział, że dla search
+  potrzebny PNG).
+
 ### Favicon — dlaczego się nie pokazywał
 
 Google ma twarde wymogi: `<link rel="icon">` w `<head>`, kwadratowy, **≥48×48px**,
@@ -326,4 +339,201 @@ favicon URL jest publiczny (nie za auth).
    z poprawnym URL.
 2. Otwórz sam URL favicon w przeglądarce — obraz się pokazuje, ≥48×48.
 3. Rich Results Test (Google) — wklej URL strony, sprawdź Organization.
-4. Search Console → poproś o ponowne indeksowanie strony głównej.
\ No newline at end of file
+4. Search Console → poproś o ponowne indeksowanie strony głównej.
+
+## Ręczne rozszerzenia SEO/PWA (manifest itp.) — z panelu, NIE hardkod
+
+Niektóre rzeczy SEO/PWA są na tyle projekt-specyficzne i jednorazowe, że plugin
+ich nie dostarcza (byłoby przeinżynierowaniem). Robisz je w projekcie — ALE
+poprawnie: czytając z panelu/env, nie zaszywając wartości klienta.
+
+> **Zasada:** nawet gdy coś robisz ręcznie w projekcie, dane (nazwa, kolory,
+> opis, logo) czytaj z panelu (SiteSettings) albo env. Zaszyta nazwa/kolor
+> klienta = antywzorzec (patrz standardy-kodu.md). Manifest „R Custom Cars" z
+> hardkodem zadziała tylko dla jednego klienta.
+
+### Web App Manifest (PWA) — jak zrobić DOBRZE
+
+```ts
+// app/manifest.ts
+import type { MetadataRoute } from 'next'
+import { getCachedPayload } from '@/lib/content'
+import { getSiteSettings } from '@intecion/ipal-kit'
+import type { SiteSetting } from '@/payload-types'
+
+export default async function manifest(): Promise<MetadataRoute.Manifest> {
+  const payload = await getCachedPayload()
+  const settings = await getSiteSettings<SiteSetting>(payload, { locale: 'pl' as never })
+
+  // Wszystko z panelu — zero hardkodu. Ikona z pola logo/favicon (upload),
+  // nie ze statycznej ścieżki.
+  const iconUrl =
+    typeof settings.logo === 'object' && settings.logo?.url ? settings.logo.url : undefined
+
+  return {
+    name: settings.siteName ?? '',
+    short_name: settings.siteName ?? '',          // albo osobne pole, jeśli dodasz
+    start_url: '/',
+    display: 'standalone',
+    ...(iconUrl
+      ? { icons: [{ src: iconUrl, sizes: 'any', type: 'image/svg+xml' }] }
+      : {}),
+    // description / theme_color / background_color:
+    // jeśli klient ich potrzebuje, DODAJ POLA w SiteSettings i czytaj stąd —
+    // NIE wpisuj '#d4af37' na sztywno. Bez pól — pomiń (manifest działa bez nich).
+  }
+}
+```
+
+**Kontrast — czego NIE robić** (realny błąd z sesji):
+
+```ts
+// ŹLE — wszystko zaszyte, zadziała tylko dla jednego klienta
+let name = 'R Custom Cars'                          // hardkod nazwy
+short_name: 'RCC',                                  // hardkod
+description: 'Custom car styling...',               // hardkod
+background_color: '#08080a', theme_color: '#d4af37', // hardkod kolorów
+icons: [{ src: '/logo/rcc-logo.svg' }]              // statyczna ścieżka, nie panel
+```
+
+Jeśli klient potrzebuje kolorów motywu / opisu w manifeście — **dodaj pola**
+`themeColor`, `manifestDescription` w SiteSettings (SiteSettingsFields przez
+opcje pluginu) i czytaj z panelu. Wtedy redaktor je zmienia, i nie są zaszyte.
+
+### Inne ręczne rozszerzenia — ta sama zasada
+
+Cokolwiek dodajesz ręcznie (dodatkowe meta tagi, structured data konkretnego
+typu, itp.):
+- dane z panelu (SiteSettings / pola strony) albo env
+- nic zaszytego per klient (nazwa, kolor, adres, domena)
+- jeśli to uniwersalne i powtarzalne → rozważ zgłoszenie do pluginu zamiast
+  ręcznie (patrz ANTIGRAVITY-ZASADY-AGENT.md A0)
+
+## SEO wielojęzyczne — hreflang, x-default, redirect roota
+
+Przekierowanie `/` → `/pl` (negocjacja locale) może wpływać na SEO. Kluczowe:
+plugin generuje hreflang, więc Google rozumie, że `/pl` i `/en` to wersje
+językowe (nie duplikaty). Ale są niuanse.
+
+### hreflang + x-default (generowane przez plugin)
+
+`buildHreflangAlternates` generuje `alternates.languages` z wpisami per locale
+ORAZ **`x-default`** wskazujący na defaultLocale. x-default mówi Google: „gdy
+język/region użytkownika nie pasuje do żadnej wersji, użyj TEJ" — co pokrywa
+sytuację roota (Googlebot bez preferencji językowej). Bez x-default Google
+zgadywałby; z nim dostaje jasną wskazówkę (domyślnie pl).
+
+Działa automatycznie przez createPageMetadata (canonical + hreflang + x-default).
+
+### Redirect roota — na co uważać
+
+- **307 (temporary)** na `/` → `/pl` — plugin tak robi. Dla warunkowego redirectu
+  (zależnego od negocjacji) to obronne. Google i tak podąża.
+- **Negocjacja Accept-Language** — Googlebot bywa z `Accept-Language: en` albo
+  bez. Może trafić na `/en`. x-default (→ pl) łagodzi to: Google wie, że
+  domyślna wersja to polska.
+- **Root nie ma własnej treści** — cała moc idzie przez redirect na locale. To
+  normalne dla i18n stron, hreflang to obsługuje.
+
+### Weryfikacja SEO wielojęzycznego
+
+1. Search Console → Inspekcja URL dla `/` — zobacz, na co Google przekierowuje
+   i co indeksuje.
+2. Sprawdź, czy `/pl` i `/en` są indeksowane osobno (nie jako duplikaty).
+3. Rich Results / źródło strony → potwierdź `<link rel="alternate" hreflang="...">`
+   z wpisami per locale + `hreflang="x-default"`.
+4. Search Console → raport Międzynarodowe targetowanie (jeśli dostępny) — błędy
+   hreflang.
+
+### Częste błędy (nie rób tak)
+
+- Brak hreflang → Google traktuje wersje jako duplikaty (plugin to ma, nie usuwaj).
+- Zaszyta mapa ścieżek zamiast getLocalizedSlugs → hreflang się rozjedzie z bazą.
+- `noindex` na `/pl` przez pomyłkę → wypada z indeksu. Sprawdź robots meta.
+- Redirect roota na twardo 301 do jednego języka → tracisz negocjację i drugą
+  wersję. Zostaw negocjację + hreflang.
+
+## Sitelinks i structured data (branding w wynikach Google)
+
+Cel: żeby wyszukanie marki („rcustomcars") pokazało stronę główną + podlinki
+(sitelinks) z opisami. Ważne — **sitelinków NIE DA SIĘ wymusić.** Google
+generuje je algorytmicznie ze struktury strony, linkowania wewnętrznego, jasnych
+tytułów i rankingu. Żaden kod ich nie włączy. Plugin dostarcza SYGNAŁY, które
+zwiększają szansę — nie gwarancję.
+
+### Co realnie wpływa na sitelinki (kolejność wg wagi)
+
+1. **Ranking na 1. stronie Google** — bez tego sitelinków nie ma. To robota SEO
+   (treść, linki), nie kodu.
+2. **Czysta struktura + jasne tytuły** — logiczna hierarchia stron, opisowe title
+   (nie „Strona 1"). Patrz fundamenty-projektu.md.
+3. **Linkowanie wewnętrzne** — ważne strony podlinkowane z głównej.
+4. **Structured data** (poniżej) — sygnał pomocniczy, nie przełącznik.
+5. **Sitemap + robots** — żeby Google w ogóle widział wszystkie strony (patrz
+   niżej — to fundament, sprawdź czy działa!).
+
+### Structured data z pluginu — 3 helpery
+
+Wszystkie emitowane jako `<script type="application/ld+json">`, dane z panelu.
+
+**1. WebSite + SearchAction (największy realny efekt)** — może dać sitelinks
+searchbox (pole wyszukiwania pod wynikiem marki). RAZ w root layout:
+```tsx
+import { buildWebSiteJsonLd } from '@intecion/ipal-kit'
+const jsonLd = buildWebSiteJsonLd({
+  name: settings.siteName,
+  url: baseUrl,
+  // TYLKO jeśli masz działającą stronę wyszukiwania:
+  search: { target: `${baseUrl}/szukaj?q={search_term_string}` },
+})
+```
+Pomiń `search`, jeśli nie ma realnej wyszukiwarki — SearchAction wskazujący na
+nieistniejącą stronę szkodzi.
+
+**2. BreadcrumbList (realny efekt)** — okruszki w wynikach (Dom › Usługi ›
+Detailing) + Google rozumie hierarchię. PER STRONA, z pozycji strony:
+```tsx
+import { buildBreadcrumbJsonLd } from '@intecion/ipal-kit'
+const jsonLd = buildBreadcrumbJsonLd([
+  { name: 'Strona główna', url: `${base}/pl` },
+  { name: 'Usługi', url: `${base}/pl/uslugi` },
+  { name: 'Detailing', url: `${base}/pl/uslugi/detailing` },
+])
+```
+Okruszki buduj z RZECZYWISTEJ pozycji strony (resolveRoute / ścieżka URL), NIE z
+zaszytej listy.
+
+**3. SiteNavigationElement (słabszy, tani)** — nawigacja jako dane. RAZ, z tych
+samych pozycji co menu w headerze:
+```tsx
+import { buildSiteNavigationJsonLd } from '@intecion/ipal-kit'
+const jsonLd = buildSiteNavigationJsonLd(
+  navItems.map(i => ({ name: i.label, url: `${base}${i.href}` }))
+)
+```
+Dane z tego samego źródła co widoczne menu — nie osobna zaszyta lista.
+
+### Realne oczekiwania (ważne)
+
+- Structured data **nie gwarantuje** sitelinków — to sygnał wśród wielu.
+- Efekt (jeśli będzie) pojawia się **po tygodniach**, gdy Google przecrawluje i
+  strona rankuje.
+- Największy wpływ ma **ranking + struktura + linkowanie**, nie schema. Schema
+  pomaga Google zrozumieć, ale nie zastąpi bycia na 1. stronie.
+- Weryfikuj: Google Rich Results Test (czy schema poprawna) + Search Console
+  (co Google pokazuje dla marki).
+
+### To, co ZALEŻY OD PROJEKTU (obowiązki wpięcia)
+
+Plugin dostarcza helpery — projekt MUSI je wpiąć i podać dane z panelu:
+
+- [ ] `buildWebSiteJsonLd` w root layout (search tylko jeśli jest wyszukiwarka)
+- [ ] `buildOrganizationJsonLd` w root layout (logo, nazwa)
+- [ ] `buildBreadcrumbJsonLd` na podstronach (z realnej ścieżki)
+- [ ] `buildSiteNavigationJsonLd` z pozycji menu (jeśli jest header nav)
+- [ ] `app/robots.ts` i `app/sitemap.ts` wystawione (patrz niżej — bez tego
+  Google nie widzi stron!)
+- [ ] Jasne, opisowe tytuły stron (nie generyczne)
+- [ ] Logiczna hierarchia + linkowanie wewnętrzne z głównej
+
+Dane WSZĘDZIE z panelu (siteName, nav, logo), nigdy zaszyte.
\ No newline at end of file
diff --git a/src/index.ts b/src/index.ts
index 0984c2e..a3937ea 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -104,6 +104,13 @@ export {
   buildOrganizationJsonLd,
   validateFaviconField,
 } from './modules/seo/index.js'
+// Structured data (schema.org JSON-LD) — brand/sitelink signals for Google.
+// WebSite (+ optional SearchAction), BreadcrumbList (per page), SiteNavigation.
+export {
+  buildBreadcrumbJsonLd,
+  buildSiteNavigationJsonLd,
+  buildWebSiteJsonLd,
+} from './modules/seo/index.js'
 export type { PageMetadata, SeoMeta, SeoOption } from './modules/seo/index.js'
 export { buildHreflangAlternates, buildMetadata, composeTitle } from './modules/seo/index.js'
 export type { AutoFillMapping, RobotsRules, SitemapEntry } from './modules/seo/index.js'
diff --git a/src/modules/seo/buildBreadcrumbJsonLd.ts b/src/modules/seo/buildBreadcrumbJsonLd.ts
new file mode 100644
index 0000000..f2b105c
--- /dev/null
+++ b/src/modules/seo/buildBreadcrumbJsonLd.ts
@@ -0,0 +1,44 @@
+type Crumb = {
+  /** Visible name of the breadcrumb (e.g. 'Usługi'). */
+  name: string
+  /** Absolute URL of this crumb (e.g. 'https://example.com/pl/uslugi'). */
+  url: string
+}
+
+/**
+ * Builds BreadcrumbList JSON-LD (schema.org) for a page's position in the site
+ * hierarchy. Google can show breadcrumbs in the result (Dom › Usługi › Detailing)
+ * and uses them to understand structure — a signal that helps navigational
+ * results and sitelinks.
+ *
+ * Unlike Organization/WebSite (site-wide, root layout), breadcrumbs are
+ * PER-PAGE — build them from the page's ancestry and emit on that page:
+ *
+ *   import { buildBreadcrumbJsonLd } from '@intecion/ipal-kit'
+ *   const jsonLd = buildBreadcrumbJsonLd([
+ *     { name: 'Strona główna', url: `${base}/pl` },
+ *     { name: 'Usługi', url: `${base}/pl/uslugi` },
+ *     { name: 'Detailing', url: `${base}/pl/uslugi/detailing` },
+ *   ])
+ *   <script type="application/ld+json" ... />
+ *
+ * The crumb data comes from the page's real position (parent pages / URL path),
+ * NOT hardcoded. Derive it from the resolved route, not a static list.
+ *
+ * Returns null for an empty/single crumb list — a one-item breadcrumb isn't
+ * meaningful and shouldn't be emitted.
+ */
+export function buildBreadcrumbJsonLd(crumbs: Crumb[]) {
+  if (!crumbs || crumbs.length < 2) {return null}
+
+  return {
+    '@context': 'https://schema.org',
+    '@type': 'BreadcrumbList',
+    itemListElement: crumbs.map((crumb, index) => ({
+      name: crumb.name,
+      '@type': 'ListItem',
+      item: crumb.url,
+      position: index + 1,
+    })),
+  }
+}
diff --git a/src/modules/seo/buildSiteNavigationJsonLd.ts b/src/modules/seo/buildSiteNavigationJsonLd.ts
new file mode 100644
index 0000000..b3b8110
--- /dev/null
+++ b/src/modules/seo/buildSiteNavigationJsonLd.ts
@@ -0,0 +1,39 @@
+type NavItem = {
+  /** Visible label (e.g. 'Usługi'). */
+  name: string
+  /** Absolute URL (e.g. 'https://example.com/pl/uslugi'). */
+  url: string
+}
+
+/**
+ * Builds SiteNavigationElement JSON-LD (schema.org) from the main navigation —
+ * declares the site's primary nav as structured data. A weaker sitelinks signal
+ * than WebSite/breadcrumbs, but cheap: it tells Google which pages are the main
+ * navigation targets.
+ *
+ * Feed it the SAME nav items the header renders (from the panel/nav global), so
+ * the structured data matches the visible menu — not a separate hardcoded list.
+ *
+ *   import { buildSiteNavigationJsonLd } from '@intecion/ipal-kit'
+ *   const jsonLd = buildSiteNavigationJsonLd(
+ *     navItems.map(i => ({ name: i.label, url: `${base}${i.href}` }))
+ *   )
+ *   <script type="application/ld+json" ... />
+ *
+ * Emit once (site-wide, root layout). Data from the nav source, never hardcoded.
+ * Returns null for empty nav.
+ */
+export function buildSiteNavigationJsonLd(items: NavItem[]) {
+  if (!items || items.length === 0) {return null}
+
+  return {
+    '@context': 'https://schema.org',
+    '@type': 'ItemList',
+    itemListElement: items.map((item, index) => ({
+      name: item.name,
+      '@type': 'SiteNavigationElement',
+      position: index + 1,
+      url: item.url,
+    })),
+  }
+}
diff --git a/src/modules/seo/buildWebSiteJsonLd.ts b/src/modules/seo/buildWebSiteJsonLd.ts
new file mode 100644
index 0000000..6734e37
--- /dev/null
+++ b/src/modules/seo/buildWebSiteJsonLd.ts
@@ -0,0 +1,62 @@
+type SearchActionConfig = {
+  /**
+   * URL template for site search, with {search_term_string} placeholder.
+   * e.g. 'https://example.com/szukaj?q={search_term_string}'. Only include if
+   * the site actually HAS a working search page — a SearchAction pointing at a
+   * non-existent search does more harm than good.
+   */
+  target: string
+}
+
+type WebSiteJsonLdArgs = {
+  /** Site name (from panel — siteName). */
+  name: string
+  /**
+   * Optional site search. Enables the "sitelinks searchbox" — a search field
+   * Google may show under the brand result. Only pass when a real search page
+   * exists. Omit entirely otherwise.
+   */
+  search?: SearchActionConfig
+  /** Absolute site URL (https://…). */
+  url: string
+}
+
+/**
+ * Builds WebSite JSON-LD (schema.org). Two jobs:
+ *  - Declares the site + name (helps Google associate brand queries with the site).
+ *  - Optionally declares a SearchAction, which is what can produce the "sitelinks
+ *    searchbox" (a search field under the brand result in Google).
+ *
+ * IMPORTANT — sitelinks (the sub-links under a result) CANNOT be forced. No
+ * schema guarantees them; Google generates them algorithmically from site
+ * structure, internal links, clear titles, and ranking. This schema is a SIGNAL
+ * that improves the odds and can enable the searchbox — not a switch. Manage
+ * expectations accordingly (see docs/seo.md).
+ *
+ * Emit once in the ROOT layout (site-wide), from panel data:
+ *
+ *   import { buildWebSiteJsonLd } from '@intecion/ipal-kit'
+ *   const jsonLd = buildWebSiteJsonLd({ name: settings.siteName, url: baseUrl })
+ *   <script type="application/ld+json"
+ *     dangerouslySetInnerHTML={{ __html: JSON.stringify(jsonLd) }} />
+ */
+export function buildWebSiteJsonLd({ name, search, url }: WebSiteJsonLdArgs) {
+  return {
+    name,
+    '@context': 'https://schema.org',
+    '@type': 'WebSite',
+    url,
+    ...(search
+      ? {
+          potentialAction: {
+            '@type': 'SearchAction',
+            'query-input': 'required name=search_term_string',
+            target: {
+              '@type': 'EntryPoint',
+              urlTemplate: search.target,
+            },
+          },
+        }
+      : {}),
+  }
+}
diff --git a/src/modules/seo/hreflang.ts b/src/modules/seo/hreflang.ts
index d4b349c..0bad089 100644
--- a/src/modules/seo/hreflang.ts
+++ b/src/modules/seo/hreflang.ts
@@ -1,6 +1,6 @@
 import type { I18nConfig, LocalizedSlugs } from '../i18n/index.js'
 
-import { buildLocalizedPath, getLocaleCodes } from '../i18n/index.js'
+import { buildLocalizedPath, getDefaultLocale, getLocaleCodes } from '../i18n/index.js'
 
 type BuildHreflangArgs = {
   /** Absolute site origin, e.g. 'https://example.com'. Omit for relative paths. */
@@ -19,20 +19,28 @@ type BuildHreflangArgs = {
 }
 
 /**
- * Builds a map of locale → URL for hreflang alternate links, suitable for
  * Next.js Metadata `alternates.languages`.
  *
  * Bridges SEO and i18n: for each configured locale that the document has a
  * slug in, it produces the locale-aware path (via buildLocalizedPath),
  * optionally prefixed with an absolute origin.
  *
+ * Also emits `x-default` pointing at the default locale — the version Google
+ * serves when the user's language/region matches no hreflang, and the fallback
+ * when the root ('/') redirect is ambiguous (Googlebot with no/foreign
+ * Accept-Language).
+ *
  * @example
  * buildHreflangAlternates({
  *   slugs: { pl: 'o-nas', en: 'about' },
  *   config,
  *   baseUrl: 'https://example.com',
  * })
- * // → { pl: 'https://example.com/pl/o-nas', en: 'https://example.com/en/about' }
+ * // → {
+ * //   pl: 'https://example.com/pl/o-nas',
+ * //   en: 'https://example.com/en/about',
+ * //   'x-default': 'https://example.com/pl/o-nas',
+ * // }
  */
 export function buildHreflangAlternates({
   baseUrl,
@@ -51,5 +59,15 @@ export function buildHreflangAlternates({
     }
   }
 
+  // x-default: the version Google serves when the user's language/region doesn't
+  // match any hreflang — and, crucially here, the fallback when the root ('/')
+  // redirect is ambiguous (Googlebot with no/foreign Accept-Language). Point it
+  // at the default locale (the primary market) so search shows that version by
+  // default instead of guessing. Only set when the default locale has a URL.
+  const defaultLocalePath = alternates[getDefaultLocale(config)]
+  if (defaultLocalePath) {
+    alternates['x-default'] = defaultLocalePath
+  }
+
   return alternates
 }
diff --git a/src/modules/seo/index.ts b/src/modules/seo/index.ts
index 86c3338..90a4a8c 100644
--- a/src/modules/seo/index.ts
+++ b/src/modules/seo/index.ts
@@ -1,5 +1,6 @@
 export { buildAutoFillMetaHook } from './autoFillMeta.js'
 export type { AutoFillMapping } from './autoFillMeta.js'
+export { buildBreadcrumbJsonLd } from './buildBreadcrumbJsonLd.js'
 export { buildIconsMetadata } from './buildIconsMetadata.js'
 export { buildMetadata } from './buildMetadata.js'
 export type { PageMetadata } from './buildMetadata.js'
@@ -8,6 +9,8 @@ export { buildRobots } from './buildRobots.js'
 export type { RobotsRules } from './buildRobots.js'
 export { buildSitemapEntries } from './buildSitemapEntries.js'
 export type { SitemapEntry } from './buildSitemapEntries.js'
+export { buildSiteNavigationJsonLd } from './buildSiteNavigationJsonLd.js'
+export { buildWebSiteJsonLd } from './buildWebSiteJsonLd.js'
 export { composeTitle } from './composeTitle.js'
 export type { TitleOrder } from './composeTitle.js'
 export { createMetadataGenerator } from './createMetadataGenerator.js'