diff --git a/themes/bonsai/layouts/_default/manifest.webmanifest b/themes/bonsai/layouts/_default/manifest.webmanifest
new file mode 100644
index 0000000..25156ad
--- /dev/null
+++ b/themes/bonsai/layouts/_default/manifest.webmanifest
@@ -0,0 +1,31 @@
+{{- $name := site.Params.name | default site.Title -}}
+{{- $shortName := site.Params.shortName | default (substr $name 0 12) -}}
+{{- $themeColor := site.Params.themeColor | default "#8b3a2b" -}}
+{{- $bgColor := site.Params.themeBackground | default "#f4efe6" -}}
+{{- /* start_url and scope use relURL so subpath deployments (e.g. GitHub Pages
+       project sites at /repo/) install correctly. */ -}}
+{{- $root := "/" | relURL -}}
+{{- $hasIcons := or site.Params.appleTouchIcon site.Params.faviconSvg -}}
+{
+  "name": "{{ $name }}",
+  "short_name": "{{ $shortName }}",
+  "start_url": "{{ $root }}",
+  "scope": "{{ $root }}",
+  "display": "minimal-ui",
+  "background_color": "{{ $bgColor }}",
+  "theme_color": "{{ $themeColor }}"
+  {{- if $hasIcons -}}
+  ,
+  "icons": [
+    {{- $first := true -}}
+    {{- with site.Params.appleTouchIcon -}}
+      {{- if $first }}{{ $first = false }}{{ else }},{{ end }}
+      { "src": "{{ . | relURL }}", "sizes": "180x180", "type": "image/png" }
+    {{- end -}}
+    {{- with site.Params.faviconSvg -}}
+      {{- if $first }}{{ $first = false }}{{ else }},{{ end }}
+      { "src": "{{ . | relURL }}", "sizes": "any", "type": "image/svg+xml" }
+    {{- end -}}
+  ]
+  {{- end }}
+}
diff --git a/themes/bonsai/layouts/_default/vcard.vcf b/themes/bonsai/layouts/_default/vcard.vcf
new file mode 100644
index 0000000..bfe888e
--- /dev/null
+++ b/themes/bonsai/layouts/_default/vcard.vcf
@@ -0,0 +1,22 @@
+{{- $name := site.Params.name | default site.Title -}}
+{{- /* Flatten links + sections for URL lines. */ -}}
+{{- $allLinks := slice -}}
+{{- if site.Params.sections -}}
+  {{- range site.Params.sections -}}{{- range .links -}}{{- $allLinks = $allLinks | append . -}}{{- end -}}{{- end -}}
+{{- else -}}{{- $allLinks = site.Params.links -}}{{- end -}}
+BEGIN:VCARD
+VERSION:3.0
+FN:{{ $name }}
+{{ with site.Params.jobTitle }}TITLE:{{ . }}
+{{ end -}}
+{{ with site.Params.email }}EMAIL:{{ . }}
+{{ end -}}
+{{ with site.Params.location }}ADR:;;{{ . }};;;;
+{{ end -}}
+URL:{{ site.BaseURL }}
+{{ range $allLinks -}}
+{{- if and .url (not (or (strings.HasPrefix .url "mailto:") (strings.HasPrefix .url "tel:"))) -}}
+URL;TYPE={{ .title | upper }}:{{ .url }}
+{{ end -}}
+{{- end -}}
+END:VCARD
diff --git a/themes/bonsai/layouts/partials/qr-block.html b/themes/bonsai/layouts/partials/qr-block.html
new file mode 100644
index 0000000..deec835
--- /dev/null
+++ b/themes/bonsai/layouts/partials/qr-block.html
@@ -0,0 +1,15 @@
+{{- /* Render a QR code of the current page Permalink inside a collapsible <details>.
+       Gated by site.Params.qr = true. Uses Hugo's built-in images.QR (≥ 0.140).
+       The PNG is generated at build time and cached under resources/_gen/. */ -}}
+{{- if site.Params.qr -}}
+{{- $url := .Permalink -}}
+{{- $qr := images.QR $url (dict "level" "medium" "scale" 4) -}}
+{{- $showLabel := i18n "show_qr" | default "Show QR code" -}}
+{{- $alt := i18n "qr_alt" | default "QR code linking to this page" -}}
+<details class="bio__qr">
+  <summary>{{ $showLabel }}</summary>
+  <img class="bio__qr-img" src="{{ $qr.RelPermalink }}"
+       width="{{ $qr.Width }}" height="{{ $qr.Height }}"
+       alt="{{ $alt }}" loading="lazy" decoding="async" />
+</details>
+{{- end -}}
diff --git a/themes/bonsai/layouts/partials/schema-website.html b/themes/bonsai/layouts/partials/schema-website.html
new file mode 100644
index 0000000..ee203d1
--- /dev/null
+++ b/themes/bonsai/layouts/partials/schema-website.html
@@ -0,0 +1,14 @@
+{{- /* Optional WebSite JSON-LD for rich-snippet eligibility.
+       Off by default — opt in via params.schemaWebSite = true. */ -}}
+{{- if site.Params.schemaWebSite -}}
+{{- $name := site.Params.name | default site.Title -}}
+{{- $payload := dict
+  "@context" "https://schema.org"
+  "@type"    "WebSite"
+  "name"     $name
+  "url"      site.BaseURL
+  "inLanguage" (site.Language.LanguageCode | default site.LanguageCode | default "en")
+-}}
+{{- with site.Params.bio -}}{{- $payload = merge $payload (dict "description" .) -}}{{- end -}}
+<script type="application/ld+json">{{ $payload | jsonify | safeJS }}</script>
+{{- end -}}
diff --git a/themes/bonsai/layouts/partials/share-button.html b/themes/bonsai/layouts/partials/share-button.html
new file mode 100644
index 0000000..22e7f7a
--- /dev/null
+++ b/themes/bonsai/layouts/partials/share-button.html
@@ -0,0 +1,19 @@
+{{- /* Render a share button. Uses navigator.share (Web Share API) when available;
+       falls back to clipboard.writeText with a small toast.
+       Loaded only when site.Params.share = true (gated by caller). */ -}}
+{{- $name := site.Params.name | default site.Title -}}
+{{- $shareLabel := i18n "share_label" | default "Share this page" -}}
+{{- $copied := i18n "share_copied" | default "Link copied" -}}
+{{- $failed := i18n "share_failed" | default "Could not share" -}}
+<button type="button"
+        class="bio__share"
+        data-bonsai-share
+        data-share-url="{{ .Permalink }}"
+        data-share-title="{{ $name }}"
+        data-toast-copied="{{ $copied }}"
+        data-toast-failed="{{ $failed }}"
+        aria-label="{{ $shareLabel }}">
+  <span class="bio__share-icon" aria-hidden="true">{{ partial "icon.html" "share" }}</span>
+  <span class="bio__share-label">{{ $shareLabel }}</span>
+</button>
+<output class="bio__share-toast" role="status" aria-live="polite" hidden></output>