diff --git a/.agents/tasks/dart-sass-site-styles.md b/.agents/tasks/dart-sass-site-styles.md
new file mode 100644
index 00000000..22c79733
--- /dev/null
+++ b/.agents/tasks/dart-sass-site-styles.md
@@ -0,0 +1,59 @@
+---
+slug: dart-sass-site-styles
+branch: get-theme-updates-dart-sass
+owner: claude
+status: in-review
+started: 2026-10-30
+---
+
+## Goal
+
+The site builds on the Dart Sass `site-commons` theme, and its own styles use
+the Sass module system, so `hugo --minify` prints no Sass warnings and the CSS
+stays the same.
+
+## Context
+
+- SpineEventEngine/site-commons#38 — move the theme and its sites from LibSass
+  to Dart Sass. Hugo deprecated LibSass in v0.153.0; Dart Sass 3.0 removes `@import`.
+- The theme update brings in site-commons#39 (jQuery served as a file), #40
+  (Dart Sass) and #41 (`@use`/`@forward`). `theme-main.scss` forwards the theme
+  and Bootstrap, so `@use "theme-main" as *;` gives a partial what `@import` did.
+- Hugo sets `silenceDependencyDeprecations`, which hides deprecations in every
+  file except the entry one. The `sass` CLI with `--verbose` shows them all.
+- Also folds in the Dependabot bumps of #558 (`source-map-js`) and #560
+  (`postcss-selector-parser`, `@fullhuman/postcss-purgecss` 8). Nothing loads
+  PurgeCSS; the CSS is byte-identical with and without them.
+
+## Plan
+
+- [x] `hugo mod get -u github.com/SpineEventEngine/site-commons` in `site/`.
+- [x] Cherry-pick the bumps from #558 and #560.
+- [x] `main.scss` and its partials: `@import` → `@use`, in the same order.
+  - Partials that use theme or Bootstrap members: `@use "theme-main" as *;`.
+  - Partials that use another partial's members `@use` it by a relative path:
+    `base/colors` (variables), `base/common` (`%expandable-title`) and
+    `modules/forms` (`$form-error-color`). `main.scss` loads each of them
+    before its users, so no CSS moves.
+- [x] `map-get()` → `map.get()`, `fade-out()` → `color.adjust($alpha: …)`.
+- [x] Verify: Sass warnings, and the CSS rule by rule against the previous build.
+- [x] Keep Check Links passing. With jQuery no longer inlined (site-commons#39),
+  Lychee reads whole pages and finds 14 links that were already broken.
+  - Point the Gitter link of the 1.0 blog post to where Gitter redirects.
+  - `.lycheeignore` lists the 13 broken in the imported docs, as in
+    SpineEventEngine/documentation#96.
+
+## Log
+
+- 2026-10-30 — theme update: the only Sass warnings left are the 28 `@import`s
+  in `main.scss`. CSS differences are Dart Sass formatting and precision, folded
+  `calc()`, the code-tab indicator's `border-radius: 1px`, no `@extend`ed
+  `.h1`–`.h6`/`.small`/`.mark` selectors (no page uses them), and the medium
+  Roboto Mono `.eot` now pointing to `fonts/robotomono/` (site-commons#41).
+- 2026-10-30 — `@use` move: `hugo --minify` prints no Sass warnings. The `sass`
+  CLI reports 52 fewer deprecations (382 → 330), all the site's own; the rest
+  come from Bootstrap. The CSS has the same 12,764 declarations; one
+  `@extend`ed selector list lists its two selectors in the other order.
+- 2026-10-30 — the CSS now starts with the theme's license comment instead of
+  Bootstrap's. `@use "theme-main"` emits that file's `/*!` header first, and
+  the theme's PostCSS step keeps only the first comment. To fix in `site-commons`.
diff --git a/.github/workflows/check-links.yml b/.github/workflows/check-links.yml
index 3f9b1562..fa41d67b 100644
--- a/.github/workflows/check-links.yml
+++ b/.github/workflows/check-links.yml
@@ -8,6 +8,7 @@ on:
       - 'docs/**'
       - 'site/**'
       - 'lychee.toml'
+      - '.lycheeignore'
       - '.github/workflows/check-links.yml'
   workflow_dispatch:
 
@@ -110,13 +111,13 @@ jobs:
         if: steps.docs.outputs.present == 'true'
         run: hugo env | grep 'github.com/sass/dart-sass'
 
-      # `actions/setup-node@v4` ships with built-in npm caching that hashes
+      # `actions/setup-node` ships with built-in npm caching that hashes
       # the lockfile and restores `~/.npm`. We use that instead of a
-      # standalone `actions/cache@v4` block so there is only one source of
+      # standalone `actions/cache` block so there is only one source of
       # truth for the cache key (no drift between two layers).
       - name: Setup Node
         if: steps.docs.outputs.present == 'true'
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v7
         with:
           node-version: '26'
           cache: 'npm'
@@ -128,7 +129,7 @@ jobs:
       # invalidates the cache deterministically regardless of site root.
       - name: Cache Hugo Modules
         if: steps.docs.outputs.present == 'true'
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: /tmp/hugo_cache
           key: ${{ runner.os }}-hugomod-${{ hashFiles('docs/**/go.sum', 'site/**/go.sum') }}
@@ -152,7 +153,7 @@ jobs:
       # `max_cache_age` expires.
       - name: Cache Lychee results
         if: steps.docs.outputs.present == 'true'
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: .lycheecache
           key: cache-lychee-${{ runner.os }}-${{ hashFiles('lychee.toml') }}
@@ -167,7 +168,7 @@ jobs:
       - name: Cache Lychee executable
         if: steps.docs.outputs.present == 'true'
         id: cache-lychee
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: lychee
           key: ${{ runner.os }}-${{ env.LYCHEE_VERSION_TAG }}-${{ env.LYCHEE_RELEASE }}
@@ -187,7 +188,7 @@ jobs:
       # string when the file is absent, so this guard runs the download iff
       # neither the exact key nor any restore-key restored the binary.
       - name: Download Lychee executable
-        uses: robinraju/release-downloader@v1.7
+        uses: robinraju/release-downloader@v1.13
         if: steps.docs.outputs.present == 'true' && hashFiles('lychee/lychee') == ''
         with:
           repository: "lycheeverse/lychee"
@@ -239,9 +240,32 @@ jobs:
             exit 1
           fi
 
+      # Lychee prints broken links to this step's log only; the run page
+      # shows just "Process completed with exit code 2". `tee` keeps the
+      # report in the log and saves a copy, which the next step adds to the
+      # run summary. (`--output` would not do: it moves the report from the
+      # log to the file.) `pipefail` keeps Lychee's exit code. Without it,
+      # the step would take `tee`'s 0 and pass despite broken links.
       - name: Check links
         if: steps.docs.outputs.present == 'true'
         run: |
+          set -o pipefail
           ./lychee/lychee --config lychee.toml --timeout 60 \
           --base-url http://localhost:1313/ \
-          '${{ steps.docs.outputs.work_dir }}/public/**/*.html'
+          '${{ steps.docs.outputs.work_dir }}/public/**/*.html' \
+          | tee lychee-report.txt
+
+      # Runs after a failed `Check links` too, which is when the report
+      # matters most. `hashFiles` skips this step when Lychee never ran.
+      # `!cancelled()` needs the `${{ }}` wrapper: a bare leading `!` is
+      # a YAML tag.
+      - name: Publish link report
+        if: ${{ !cancelled() && hashFiles('lychee-report.txt') != '' }}
+        run: |
+          {
+            echo '## Link check'
+            echo
+            echo '```text'
+            cat lychee-report.txt
+            echo '```'
+          } >> "$GITHUB_STEP_SUMMARY"
diff --git a/.lycheeignore b/.lycheeignore
new file mode 100644
index 00000000..9c09d7ef
--- /dev/null
+++ b/.lycheeignore
@@ -0,0 +1,23 @@
+# Lychee skips the URLs matching these patterns. It reads this file from the
+# directory it runs in, the repository root. `lychee.toml` comes from `config`
+# and `./config/pull` overwrites it, so links specific to this site go here.
+#
+# Remove a pattern once the module update that fixes its link lands here.
+
+# Broken in the docs of `SpineEventEngine/documentation`, which
+# `site/config/_default/hugo.toml` imports as a module. Fixed by
+# https://github.com/SpineEventEngine/documentation/pull/96.
+^https://stackoverflow\.com/a/31814967/3183076$
+
+# Broken in the docs of `SpineEventEngine/validation`, which come in through
+# `SpineEventEngine/documentation`, so they can only be fixed there.
+# See https://github.com/SpineEventEngine/documentation/issues/97.
+^https://github\.com/SpineEventEngine/validation/blob/master/\.agents/running-builds\.md$
+^https://github\.com/SpineEventEngine/validation/blob/master/\.agents/documentation-guidelines\.md$
+^https://github\.com/SpineEventEngine/embed-code-go/blob/master/EMBEDDING\.md$
+^https://github\.com/SpineEventEngine/embed-code-go/tree/master/bin$
+^https://plugins\.gradle\.org/plugin/io\.spine\.validation$
+# Relative links that resolve outside the module's pages.
+^http://localhost:[0-9]+/06-developers-guide/$
+^http://localhost:[0-9]+/developer/$
+^http://localhost:[0-9]+/typical_custom_option\.jpg$
diff --git a/config b/config
index f5a8d409..0a2a559b 160000
--- a/config
+++ b/config
@@ -1 +1 @@
-Subproject commit f5a8d4093cd9d54b39a13f4da61c2932cc12a909
+Subproject commit 0a2a559ba37c0103f9135850bb770724370e8235
diff --git a/site/assets/scss/base/_colors.scss b/site/assets/scss/base/_colors.scss
index 5f222922..7fad1bda 100755
--- a/site/assets/scss/base/_colors.scss
+++ b/site/assets/scss/base/_colors.scss
@@ -12,6 +12,8 @@
  * and limitations under the License.
  */
 
+@use "theme-main" as *;
+
 /* Extends colors from `site-commons`. */
 
 $nav-blue-gradient: linear-gradient(152deg, #1378da 0%, #0b64cc 100%);
diff --git a/site/assets/scss/base/_common.scss b/site/assets/scss/base/_common.scss
index ee4a0406..61a75a07 100755
--- a/site/assets/scss/base/_common.scss
+++ b/site/assets/scss/base/_common.scss
@@ -12,6 +12,9 @@
  * and limitations under the License.
  */
 
+@use "sass:color";
+@use "theme-main" as *;
+
 .intro-section {
   padding-top: 40px;
   padding-bottom: 48px;
@@ -24,7 +27,7 @@
 
 // Collapsible caret-icon in the mobile navigation and footer.
 .mobile-caret-icon {
-  background: fade-out($white, .97) url('img/icons/caret.svg') no-repeat center/cover;
+  background: color.adjust($white, $alpha: -.97) url('img/icons/caret.svg') no-repeat center/cover;
   opacity: 1;
   cursor: pointer;
   position: absolute;
diff --git a/site/assets/scss/main.scss b/site/assets/scss/main.scss
index ec9ba245..d2233f6a 100644
--- a/site/assets/scss/main.scss
+++ b/site/assets/scss/main.scss
@@ -13,34 +13,34 @@
  */
 
 /* Styles from `SpineEventEngine/site-commons`. */
-@import "theme-main";
+@use "theme-main";
 
-@import "base/colors";
-@import "base/common";
+@use "base/colors";
+@use "base/common";
 
-@import "modules/navbar";
-@import "modules/nav-search";
-@import "modules/buttons";
-@import "modules/footer";
-@import "modules/hero";
-@import "modules/feature-cards";
-@import "modules/call-to-action";
-@import "modules/go-top-button";
-@import "modules/subscribe-container";
-@import "modules/checkbox";
-@import "modules/redirect-screen";
-@import "modules/loader";
-@import "modules/forms";
-@import "modules/result-panel";
-@import "modules/message-modal";
+@use "modules/navbar";
+@use "modules/nav-search";
+@use "modules/buttons";
+@use "modules/footer";
+@use "modules/hero";
+@use "modules/feature-cards";
+@use "modules/call-to-action";
+@use "modules/go-top-button";
+@use "modules/subscribe-container";
+@use "modules/checkbox";
+@use "modules/redirect-screen";
+@use "modules/loader";
+@use "modules/forms";
+@use "modules/result-panel";
+@use "modules/message-modal";
 
-@import "pages/landing";
-@import "pages/release-notes/release-notes";
-@import "pages/release-notes/sidenav";
-@import "pages/faq";
-@import "pages/getting-help";
-@import "pages/about";
-@import "pages/licenses";
-@import "pages/privacy";
-@import "pages/checkout";
-@import "pages/blog";
+@use "pages/landing";
+@use "pages/release-notes/release-notes";
+@use "pages/release-notes/sidenav";
+@use "pages/faq";
+@use "pages/getting-help";
+@use "pages/about";
+@use "pages/licenses";
+@use "pages/privacy";
+@use "pages/checkout";
+@use "pages/blog";
diff --git a/site/assets/scss/modules/_buttons.scss b/site/assets/scss/modules/_buttons.scss
index 19e55837..4fcc2bd6 100644
--- a/site/assets/scss/modules/_buttons.scss
+++ b/site/assets/scss/modules/_buttons.scss
@@ -12,6 +12,8 @@
  * and limitations under the License.
  */
 
+@use "theme-main" as *;
+
 $btn-font-size: 14px;
 $btn-border-radius: $border-radius-m;
 $btn-primary-color: $main-brand-color;
diff --git a/site/assets/scss/modules/_call-to-action.scss b/site/assets/scss/modules/_call-to-action.scss
index f2d41b52..4c3af023 100644
--- a/site/assets/scss/modules/_call-to-action.scss
+++ b/site/assets/scss/modules/_call-to-action.scss
@@ -12,6 +12,9 @@
  * and limitations under the License.
  */
 
+@use "../base/colors" as *;
+@use "theme-main" as *;
+
 .call-to-action {
   background-image: $nav-blue-gradient;
   padding: 80px 0 84px;
diff --git a/site/assets/scss/modules/_checkbox.scss b/site/assets/scss/modules/_checkbox.scss
index 599498e1..bcefceb9 100644
--- a/site/assets/scss/modules/_checkbox.scss
+++ b/site/assets/scss/modules/_checkbox.scss
@@ -12,6 +12,8 @@
  * and limitations under the License.
  */
 
+@use "theme-main" as *;
+
 $checkbox-size: 18px;
 
 .checkbox-container {
diff --git a/site/assets/scss/modules/_feature-cards.scss b/site/assets/scss/modules/_feature-cards.scss
index 97a7a5b7..9f042bf2 100644
--- a/site/assets/scss/modules/_feature-cards.scss
+++ b/site/assets/scss/modules/_feature-cards.scss
@@ -12,6 +12,9 @@
  * and limitations under the License.
  */
 
+@use "../base/colors" as *;
+@use "theme-main" as *;
+
 $feature-card-shadow: 0 1px 3px 0 rgba($footer-color, .08);
 
 .feature-section {
diff --git a/site/assets/scss/modules/_footer.scss b/site/assets/scss/modules/_footer.scss
index 49628f43..088b3a12 100755
--- a/site/assets/scss/modules/_footer.scss
+++ b/site/assets/scss/modules/_footer.scss
@@ -12,6 +12,10 @@
  * and limitations under the License.
  */
 
+@use "sass:color";
+@use "../base/colors" as *;
+@use "theme-main" as *;
+
 $footer-header-color: #54595c;
 $footer-link-color: #b4bcbf;
 $copyright-bg-color: #1e2021;
@@ -58,7 +62,7 @@ footer {
     }
 
     &:focus {
-      color: fade-out($white, .1);
+      color: color.adjust($white, $alpha: -.1);
     }
 
     &::after {
@@ -145,7 +149,7 @@ footer {
           .mobile-caret-icon {
             opacity: 1;
             background-size: contain;
-            background-color: fade-out($white, .97);
+            background-color: color.adjust($white, $alpha: -.97);
             border-radius: 50%;
           }
         }
diff --git a/site/assets/scss/modules/_forms.scss b/site/assets/scss/modules/_forms.scss
index c83493f4..55e4f602 100644
--- a/site/assets/scss/modules/_forms.scss
+++ b/site/assets/scss/modules/_forms.scss
@@ -12,6 +12,8 @@
  * and limitations under the License.
  */
 
+@use "theme-main" as *;
+
 $form-error-color: $red;
 $form-success-color: $green;
 
diff --git a/site/assets/scss/modules/_go-top-button.scss b/site/assets/scss/modules/_go-top-button.scss
index 2d995a2c..298fd36a 100644
--- a/site/assets/scss/modules/_go-top-button.scss
+++ b/site/assets/scss/modules/_go-top-button.scss
@@ -12,6 +12,9 @@
  * and limitations under the License.
  */
 
+@use "sass:map";
+@use "theme-main" as *;
+
 #go-top-button {
   $top-button-size: 60px;
   $top-button-icon-size: $icon-size-l;
@@ -29,7 +32,7 @@
   height: $top-button-size;
   cursor: pointer;
   -webkit-transform: translate3d(0, 0, 0); // Prevents jumping on scroll in Chrome.
-  z-index: map_get($z-index, 'go-top-button');
+  z-index: map.get($z-index, 'go-top-button');
 
   &:after {
     content: "";
diff --git a/site/assets/scss/modules/_hero.scss b/site/assets/scss/modules/_hero.scss
index 949bebdc..299904f6 100755
--- a/site/assets/scss/modules/_hero.scss
+++ b/site/assets/scss/modules/_hero.scss
@@ -12,6 +12,9 @@
  * and limitations under the License.
  */
 
+@use "../base/colors" as *;
+@use "theme-main" as *;
+
 .nav-hero-container {
   background-image: $nav-blue-gradient;
   position: relative;
diff --git a/site/assets/scss/modules/_loader.scss b/site/assets/scss/modules/_loader.scss
index 01320b8a..48ce9412 100644
--- a/site/assets/scss/modules/_loader.scss
+++ b/site/assets/scss/modules/_loader.scss
@@ -12,6 +12,8 @@
  * and limitations under the License.
  */
 
+@use "theme-main" as *;
+
 .loader-container {
   .loader {
     margin: 16px auto 12px;
diff --git a/site/assets/scss/modules/_message-modal.scss b/site/assets/scss/modules/_message-modal.scss
index 42983a3e..629f89c8 100644
--- a/site/assets/scss/modules/_message-modal.scss
+++ b/site/assets/scss/modules/_message-modal.scss
@@ -12,10 +12,13 @@
  * and limitations under the License.
  */
 
+@use "sass:map";
+@use "theme-main" as *;
+
 .message-modal {
   position: fixed;
   inset: 0;
-  z-index: map_get($z-index, 'redirect-screen');
+  z-index: map.get($z-index, 'redirect-screen');
   display: flex;
   align-items: center;
   justify-content: center;
diff --git a/site/assets/scss/modules/_nav-search.scss b/site/assets/scss/modules/_nav-search.scss
index 44f5b407..50162283 100644
--- a/site/assets/scss/modules/_nav-search.scss
+++ b/site/assets/scss/modules/_nav-search.scss
@@ -12,8 +12,11 @@
  * and limitations under the License.
  */
 
+@use "sass:map";
+@use "theme-main" as *;
+
 $docsearch-icon-color: rgba(white, .54);
-$docsearch-mobile-breakpoint: map-get($breakpoints, mobile-navbar);
+$docsearch-mobile-breakpoint: map.get($breakpoints, mobile-navbar);
 $docsearch-algolia-mobile: 750px;
 $docsearch-border-color: #ebedf5;
 
@@ -69,7 +72,7 @@ mark {
 }
 
 .DocSearch-Container {
-  z-index: map_get($z-index, 'search-mobile') !important;
+  z-index: map.get($z-index, 'search-mobile') !important;
 
   @include breakpoint($docsearch-algolia-mobile) {
     position: fixed;
diff --git a/site/assets/scss/modules/_navbar.scss b/site/assets/scss/modules/_navbar.scss
index 515a4b7a..f09cc9a5 100755
--- a/site/assets/scss/modules/_navbar.scss
+++ b/site/assets/scss/modules/_navbar.scss
@@ -12,6 +12,11 @@
  * and limitations under the License.
  */
 
+@use "sass:color";
+@use "sass:map";
+@use "../base/colors" as *;
+@use "theme-main" as *;
+
 .navigation-opened {
   @include breakpoint(mobile-navbar) {
     overflow: hidden;
@@ -27,7 +32,7 @@
 #header {
   width: 100%;
   min-height: $header-height;
-  z-index: map_get($z-index, 'header');
+  z-index: map.get($z-index, 'header');
   position: absolute;
 
   // Fixes the header on the page.
@@ -78,7 +83,7 @@
     @include breakpoint(mobile-navbar) {
       background-color: $footer-color;
       box-shadow: -1px 0px 8px 0px rgba(black, .25);
-      z-index: map_get($z-index, 'nav-mobile');
+      z-index: map.get($z-index, 'nav-mobile');
       display: block;
       position: fixed;
       top: 0;
@@ -94,7 +99,7 @@
         width: 100%;
         height: 56px;
         background-color: rgba($footer-color, .95);
-        z-index: map_get($z-index, 'header');
+        z-index: map.get($z-index, 'header');
         margin: -48px -24px;
       }
     }
@@ -181,7 +186,7 @@
           &:hover {
             opacity: 1;
             background-size: contain;
-            background-color: fade-out($white, .97);
+            background-color: color.adjust($white, $alpha: -.97);
             border-radius: 50%;
           }
         }
@@ -270,7 +275,7 @@
     position: relative;
     transform: rotate(0deg);
     transition: .5s ease-in-out;
-    z-index: map_get($z-index, 'hamburger-menu');
+    z-index: map.get($z-index, 'hamburger-menu');
     cursor: pointer;
   }
 
diff --git a/site/assets/scss/modules/_redirect-screen.scss b/site/assets/scss/modules/_redirect-screen.scss
index 29550b8f..51407108 100644
--- a/site/assets/scss/modules/_redirect-screen.scss
+++ b/site/assets/scss/modules/_redirect-screen.scss
@@ -12,6 +12,9 @@
  * and limitations under the License.
  */
 
+@use "sass:map";
+@use "theme-main" as *;
+
 .redirect-screen {
   // The section will be hidden until the order request button is pressed.
   display: none;
@@ -22,7 +25,7 @@
     right: 0;
     bottom: 0;
     left: 0;
-    z-index: map_get($z-index, 'redirect-screen');
+    z-index: map.get($z-index, 'redirect-screen');
     background-color: rgba(255, 255, 255, .9);
     animation: fadeIn .23s linear forwards;
   }
diff --git a/site/assets/scss/modules/_result-panel.scss b/site/assets/scss/modules/_result-panel.scss
index 9f6facfe..5aaa4e6a 100644
--- a/site/assets/scss/modules/_result-panel.scss
+++ b/site/assets/scss/modules/_result-panel.scss
@@ -12,6 +12,8 @@
  * and limitations under the License.
  */
 
+@use "theme-main" as *;
+
 .error-pages {
   .main {
     display: flex;
diff --git a/site/assets/scss/modules/_subscribe-container.scss b/site/assets/scss/modules/_subscribe-container.scss
index 09f12e08..7ab27e2e 100644
--- a/site/assets/scss/modules/_subscribe-container.scss
+++ b/site/assets/scss/modules/_subscribe-container.scss
@@ -12,6 +12,9 @@
  * and limitations under the License.
  */
 
+@use "../base/colors" as *;
+@use "theme-main" as *;
+
 .subscribe-container {
   $icon-size: 32px;
 
diff --git a/site/assets/scss/pages/_about.scss b/site/assets/scss/pages/_about.scss
index 84d08d80..fdf5942f 100755
--- a/site/assets/scss/pages/_about.scss
+++ b/site/assets/scss/pages/_about.scss
@@ -12,6 +12,9 @@
  * and limitations under the License.
  */
 
+@use "../base/colors" as *;
+@use "theme-main" as *;
+
 .about {
   section {
     h2 {
diff --git a/site/assets/scss/pages/_checkout.scss b/site/assets/scss/pages/_checkout.scss
index a97fd887..0c96db96 100644
--- a/site/assets/scss/pages/_checkout.scss
+++ b/site/assets/scss/pages/_checkout.scss
@@ -12,8 +12,10 @@
  * and limitations under the License.
  */
 
-@import 'libs/country-select/select2';
-@import 'libs/intl-tel-input/intl-tel-input';
+@use "../libs/country-select/select2";
+@use "../libs/intl-tel-input/intl-tel-input";
+@use "../modules/forms" as *;
+@use "theme-main" as *;
 
 $checkout-panel-width: 790px;
 
diff --git a/site/assets/scss/pages/_faq.scss b/site/assets/scss/pages/_faq.scss
index f34688d6..f2571ae4 100644
--- a/site/assets/scss/pages/_faq.scss
+++ b/site/assets/scss/pages/_faq.scss
@@ -12,6 +12,8 @@
  * and limitations under the License.
  */
 
+@use "theme-main" as *;
+
 $icon-right-offset: 48px;
 $content-top-offset: 48px;
 $faq-title-padding: 16px $icon-right-offset;
diff --git a/site/assets/scss/pages/_getting-help.scss b/site/assets/scss/pages/_getting-help.scss
index 9a23c0e5..5ec6a347 100644
--- a/site/assets/scss/pages/_getting-help.scss
+++ b/site/assets/scss/pages/_getting-help.scss
@@ -12,6 +12,8 @@
  * and limitations under the License.
  */
 
+@use "theme-main" as *;
+
 :root {
   --pricing-card-side-padding: 32px;
   --pricing-card-header-side-padding: 32px;
diff --git a/site/assets/scss/pages/_landing.scss b/site/assets/scss/pages/_landing.scss
index f6b3ce1c..0ff583a7 100644
--- a/site/assets/scss/pages/_landing.scss
+++ b/site/assets/scss/pages/_landing.scss
@@ -12,6 +12,9 @@
  * and limitations under the License.
  */
 
+@use "../base/colors" as *;
+@use "theme-main" as *;
+
 .landing-content-container {
   padding: 32px 0 56px;
   position: relative;
diff --git a/site/assets/scss/pages/_licenses.scss b/site/assets/scss/pages/_licenses.scss
index 3d7ba138..0f1e427e 100644
--- a/site/assets/scss/pages/_licenses.scss
+++ b/site/assets/scss/pages/_licenses.scss
@@ -12,6 +12,10 @@
  * and limitations under the License.
  */
 
+@use "../base/colors" as *;
+@use "../base/common" as *;
+@use "theme-main" as *;
+
 $panel-padding: 16px 56px;
 $open-panel-padding: 8px 56px 24px;
 $open-panel-padding-mobile: 0 0 24px;
diff --git a/site/assets/scss/pages/_privacy.scss b/site/assets/scss/pages/_privacy.scss
index 4c4cd9cc..a058e7fe 100644
--- a/site/assets/scss/pages/_privacy.scss
+++ b/site/assets/scss/pages/_privacy.scss
@@ -12,6 +12,8 @@
  * and limitations under the License.
  */
 
+@use "theme-main" as *;
+
 .privacy {
   background-color: var(--body-bg-color);
 
diff --git a/site/assets/scss/pages/blog/_blog-container.scss b/site/assets/scss/pages/blog/_blog-container.scss
index a30bb5de..6e0aedfe 100644
--- a/site/assets/scss/pages/blog/_blog-container.scss
+++ b/site/assets/scss/pages/blog/_blog-container.scss
@@ -12,6 +12,8 @@
  * and limitations under the License.
  */
 
+@use "theme-main" as *;
+
 .blog-container {
   $nav-col-width: 220px;
   $blog-one-column-breakpoint: 1024px;
diff --git a/site/assets/scss/pages/blog/_blog.scss b/site/assets/scss/pages/blog/_blog.scss
index b4f3bc1d..e294effb 100755
--- a/site/assets/scss/pages/blog/_blog.scss
+++ b/site/assets/scss/pages/blog/_blog.scss
@@ -12,6 +12,8 @@
  * and limitations under the License.
  */
 
+@use "theme-main" as *;
+
 .blog {
   background-color: var(--body-bg-color);
 
diff --git a/site/assets/scss/pages/blog/_index.scss b/site/assets/scss/pages/blog/_index.scss
index 1f988b54..722a93cc 100644
--- a/site/assets/scss/pages/blog/_index.scss
+++ b/site/assets/scss/pages/blog/_index.scss
@@ -12,8 +12,8 @@
  * and limitations under the License.
  */
 
-@import "blog-container";
-@import "blog";
-@import "post-navigation";
-@import "post-info";
-@import "post";
+@use "blog-container";
+@use "blog";
+@use "post-navigation";
+@use "post-info";
+@use "post";
diff --git a/site/assets/scss/pages/blog/_post-info.scss b/site/assets/scss/pages/blog/_post-info.scss
index 097e7637..3bfff2ac 100644
--- a/site/assets/scss/pages/blog/_post-info.scss
+++ b/site/assets/scss/pages/blog/_post-info.scss
@@ -12,6 +12,8 @@
  * and limitations under the License.
  */
 
+@use "theme-main" as *;
+
 .post-info {
   margin-bottom: 20px;
 
diff --git a/site/assets/scss/pages/blog/_post-navigation.scss b/site/assets/scss/pages/blog/_post-navigation.scss
index 93b514e4..af8f4329 100644
--- a/site/assets/scss/pages/blog/_post-navigation.scss
+++ b/site/assets/scss/pages/blog/_post-navigation.scss
@@ -12,6 +12,8 @@
  * and limitations under the License.
  */
 
+@use "theme-main" as *;
+
 .post-navigation {
   $nav-item-font-size: 12px;
   $nav-item-color: $gray-700;
diff --git a/site/assets/scss/pages/blog/_post.scss b/site/assets/scss/pages/blog/_post.scss
index 888b7407..51f188da 100644
--- a/site/assets/scss/pages/blog/_post.scss
+++ b/site/assets/scss/pages/blog/_post.scss
@@ -12,6 +12,8 @@
  * and limitations under the License.
  */
 
+@use "theme-main" as *;
+
 .post {
   background-color: var(--body-bg-color);
 
diff --git a/site/assets/scss/pages/release-notes/_release-notes.scss b/site/assets/scss/pages/release-notes/_release-notes.scss
index 6fc11785..1883a79d 100644
--- a/site/assets/scss/pages/release-notes/_release-notes.scss
+++ b/site/assets/scss/pages/release-notes/_release-notes.scss
@@ -12,6 +12,8 @@
  * and limitations under the License.
  */
 
+@use "theme-main" as *;
+
 .release-notes {
   .article-container {
     min-height: 350px;
diff --git a/site/assets/scss/pages/release-notes/_sidenav.scss b/site/assets/scss/pages/release-notes/_sidenav.scss
index fbd6d463..7c4d7c12 100644
--- a/site/assets/scss/pages/release-notes/_sidenav.scss
+++ b/site/assets/scss/pages/release-notes/_sidenav.scss
@@ -12,6 +12,8 @@
  * and limitations under the License.
  */
 
+@use "theme-main" as *;
+
 // Extends styles from `scss/docs/modules/_sidenav.scss`.
 
 $sidenav-first-level-left-padding: 24px;
diff --git a/site/content/blog/spine-event-engine-1-0-is-out/index.md b/site/content/blog/spine-event-engine-1-0-is-out/index.md
index 1f55b9d6..9f53e94e 100644
--- a/site/content/blog/spine-event-engine-1-0-is-out/index.md
+++ b/site/content/blog/spine-event-engine-1-0-is-out/index.md
@@ -49,6 +49,6 @@ integration with web UI. We will announce the updates [@SpineEngine 𝕏][xtwitt
 [protobuf]: https://developers.google.com/protocol-buffers/
 [key-concepts]: docs/introduction/concepts/
 [examples]: https://github.com/spine-examples/
-[gitter-room]: https://gitter.im/SpineEventEngine/community
+[gitter-room]: https://app.gitter.im/#/room/#SpineEventEngine_community:gitter.im
 [spine-github]: https://github.com/SpineEventEngine/
 [xtwitter]: {{% get-site-data "socials.xtwitter" %}}
diff --git a/site/go.mod b/site/go.mod
index 8e4a263d..544f69e4 100644
--- a/site/go.mod
+++ b/site/go.mod
@@ -4,7 +4,7 @@ go 1.27.3
 
 require (
 	github.com/SpineEventEngine/documentation/docs v0.0.0-20261030164337-3045fa4e0dd6 // indirect
-	github.com/SpineEventEngine/site-commons v0.0.0-20261030153256-b79100d8a139 // indirect
+	github.com/SpineEventEngine/site-commons v0.0.0-20261030172811-9216e48eb656 // indirect
 	github.com/SpineEventEngine/validation/docs v0.0.0-20260902132507-6465029c83b9 // indirect
 	github.com/gohugoio/hugo-mod-bootstrap-scss/v5 v5.20300.20800 // indirect
 	github.com/gohugoio/hugo-mod-jslibs-dist/popperjs/v2 v2.21100.20000 // indirect
diff --git a/site/go.sum b/site/go.sum
index a2b7fd06..a5b9f133 100644
--- a/site/go.sum
+++ b/site/go.sum
@@ -12,6 +12,8 @@ github.com/SpineEventEngine/site-commons v0.0.0-20261001182820-d2b63aedd0f4 h1:P
 github.com/SpineEventEngine/site-commons v0.0.0-20261001182820-d2b63aedd0f4/go.mod h1:tkAl4StIREKmz9r5PiJtuDhvwMMkFXKWcaTyxhIikho=
 github.com/SpineEventEngine/site-commons v0.0.0-20261030153256-b79100d8a139 h1:DOYFVaEw9v3dML+40FysPUaTczyqK5+LqWJZQkK4Hs0=
 github.com/SpineEventEngine/site-commons v0.0.0-20261030153256-b79100d8a139/go.mod h1:TfFFABXgPop1uc4eBdfWZF0Es06TGmNHfReiOzkZqrk=
+github.com/SpineEventEngine/site-commons v0.0.0-20261030172811-9216e48eb656 h1:9H15KSiUrQP3U/uhDfVgSXMwqS7ehUppeqtQzRxR6LE=
+github.com/SpineEventEngine/site-commons v0.0.0-20261030172811-9216e48eb656/go.mod h1:TfFFABXgPop1uc4eBdfWZF0Es06TGmNHfReiOzkZqrk=
 github.com/SpineEventEngine/validation/docs v0.0.0-20260205202311-181ba8844107 h1:2DHRIwwLudP6l3Kh7Nd4KR4uXcsDtIAXE9adW68ivME=
 github.com/SpineEventEngine/validation/docs v0.0.0-20260205202311-181ba8844107/go.mod h1:STHyjXejVvPmfrxujfDvhofmjg55mMk+fwI3TVL0b4Y=
 github.com/SpineEventEngine/validation/docs v0.0.0-20260522175555-cf09b4c706ea h1:YEMSlr5KJXkZdK7epMSnN+6HSr2K41n8O3c8OhtF8pM=
diff --git a/site/package-lock.json b/site/package-lock.json
index bf28e081..eb51e566 100644
--- a/site/package-lock.json
+++ b/site/package-lock.json
@@ -9,7 +9,7 @@
       "version": "1.0.0",
       "license": "ISC",
       "devDependencies": {
-        "@fullhuman/postcss-purgecss": "^7.0.2",
+        "@fullhuman/postcss-purgecss": "^8.0.0",
         "autoprefixer": "^10.5.0",
         "intl-tel-input": "18.2.1",
         "postcss": "^8.5.14",
@@ -19,111 +19,54 @@
       }
     },
     "node_modules/@fullhuman/postcss-purgecss": {
-      "version": "7.0.2",
-      "resolved": "https://registry.npmjs.org/@fullhuman/postcss-purgecss/-/postcss-purgecss-7.0.2.tgz",
-      "integrity": "sha512-U4zAXNaVztbDxO9EdcLp51F3UxxYsb/7DN89rFxFJhfk2Wua2pvw2Kf3HdspbPhW/wpHjSjsxWYoIlbTgRSjbQ==",
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/@fullhuman/postcss-purgecss/-/postcss-purgecss-8.0.0.tgz",
+      "integrity": "sha512-fSRaBGf6+DYdfQMxedWfnIW8FSYE1LBpgy16jpK1L2vNb1HgeBRRZ+UX4UokNmW7YEAwPdvwkKdYtlkYpH+Aqg==",
       "dev": true,
+      "license": "MIT",
       "dependencies": {
-        "purgecss": "^7.0.2"
+        "purgecss": "^8.0.0"
       },
       "peerDependencies": {
         "postcss": "^8.0.0"
       }
     },
-    "node_modules/@isaacs/cliui": {
-      "version": "8.0.2",
-      "resolved": "https://registry.npmjs.org/@isaacs/cliui/-/cliui-8.0.2.tgz",
-      "integrity": "sha512-O8jcjabXaleOG9DQ0+ARXWZBTfnP4WNAqzuiJK7ll44AmxGKv/J2M4TPjxjY3znBCfvBXFzucm1twdyFybFqEA==",
-      "dev": true,
-      "dependencies": {
-        "string-width": "^5.1.2",
-        "string-width-cjs": "npm:string-width@^4.2.0",
-        "strip-ansi": "^7.0.1",
-        "strip-ansi-cjs": "npm:strip-ansi@^6.0.1",
-        "wrap-ansi": "^8.1.0",
-        "wrap-ansi-cjs": "npm:wrap-ansi@^7.0.0"
-      },
-      "engines": {
-        "node": ">=12"
-      }
-    },
-    "node_modules/@isaacs/cliui/node_modules/ansi-regex": {
-      "version": "6.2.2",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-6.2.2.tgz",
-      "integrity": "sha512-Bq3SmSpyFHaWjPk8If9yc6svM8c56dB5BAtW4Qbw5jHTwwXXcTLoRMkpDJp6VL0XzlWaCHTXrkFURMYmD0sLqg==",
-      "dev": true,
-      "engines": {
-        "node": ">=12"
-      },
-      "funding": {
-        "url": "https://github.com/chalk/ansi-regex?sponsor=1"
-      }
-    },
-    "node_modules/@isaacs/cliui/node_modules/ansi-styles": {
-      "version": "6.2.3",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-6.2.3.tgz",
-      "integrity": "sha512-4Dj6M28JB+oAH8kFkTLUo+a2jwOFkuqb3yucU0CANcRRUbxS0cP0nZYCGjcc3BNXwRIsUVmDGgzawme7zvJHvg==",
-      "dev": true,
-      "engines": {
-        "node": ">=12"
-      },
-      "funding": {
-        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
-      }
-    },
-    "node_modules/@isaacs/cliui/node_modules/emoji-regex": {
-      "version": "9.2.2",
-      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-9.2.2.tgz",
-      "integrity": "sha512-L18DaJsXSUk2+42pv8mLs5jJT2hqFkFE4j21wOmgbUqsZ2hL72NsUU785g9RXgo3s0ZNgVl42TiHp3ZtOv/Vyg==",
-      "dev": true
-    },
-    "node_modules/@isaacs/cliui/node_modules/string-width": {
-      "version": "5.1.2",
-      "resolved": "https://registry.npmjs.org/string-width/-/string-width-5.1.2.tgz",
-      "integrity": "sha512-HnLOCR3vjcY8beoNLtcjZ5/nxn2afmME6lhrDrebokqMap+XbeW8n9TXpPDOqdGK5qcI3oT0GKTW6wC7EMiVqA==",
+    "node_modules/@nodelib/fs.scandir": {
+      "version": "2.1.5",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz",
+      "integrity": "sha512-vq24Bq3ym5HEQm2NKCr3yXDwjc7vTsEThRDnkp2DK9p1uqLR+DHurm/NOTo0KG7HYHU7eppKZj3MyqYuMBf62g==",
       "dev": true,
+      "license": "MIT",
       "dependencies": {
-        "eastasianwidth": "^0.2.0",
-        "emoji-regex": "^9.2.2",
-        "strip-ansi": "^7.0.1"
+        "@nodelib/fs.stat": "2.0.5",
+        "run-parallel": "^1.1.9"
       },
       "engines": {
-        "node": ">=12"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/sindresorhus"
+        "node": ">= 8"
       }
     },
-    "node_modules/@isaacs/cliui/node_modules/strip-ansi": {
-      "version": "7.1.2",
-      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-7.1.2.tgz",
-      "integrity": "sha512-gmBGslpoQJtgnMAvOVqGZpEz9dyoKTCzy2nfz/n8aIFhN/jCE/rCmcxabB6jOOHV+0WNnylOxaxBQPSvcWklhA==",
+    "node_modules/@nodelib/fs.stat": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.stat/-/fs.stat-2.0.5.tgz",
+      "integrity": "sha512-RkhPPp2zrqDAQA/2jNhnztcPAlv64XdhIp7a7454A5ovI7Bukxgt7MX7udwAu3zg1DcpPU0rz3VV1SeaqvY4+A==",
       "dev": true,
-      "dependencies": {
-        "ansi-regex": "^6.0.1"
-      },
+      "license": "MIT",
       "engines": {
-        "node": ">=12"
-      },
-      "funding": {
-        "url": "https://github.com/chalk/strip-ansi?sponsor=1"
+        "node": ">= 8"
       }
     },
-    "node_modules/@isaacs/cliui/node_modules/wrap-ansi": {
-      "version": "8.1.0",
-      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-8.1.0.tgz",
-      "integrity": "sha512-si7QWI6zUMq56bESFvagtmzMdGOtoxfR+Sez11Mobfc7tm+VkUckk9bW2UeffTGVUbOksxmSw0AA2gs8g71NCQ==",
+    "node_modules/@nodelib/fs.walk": {
+      "version": "1.2.8",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.walk/-/fs.walk-1.2.8.tgz",
+      "integrity": "sha512-oGB+UxlgWcgQkgwo8GcEGwemoTFt3FIO9ababBmaGwXIoBKZ+GTy0pP185beGg7Llih/NSHSV2XAs1lnznocSg==",
       "dev": true,
+      "license": "MIT",
       "dependencies": {
-        "ansi-styles": "^6.1.0",
-        "string-width": "^5.0.1",
-        "strip-ansi": "^7.0.1"
+        "@nodelib/fs.scandir": "2.1.5",
+        "fastq": "^1.6.0"
       },
       "engines": {
-        "node": ">=12"
-      },
-      "funding": {
-        "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
+        "node": ">= 8"
       }
     },
     "node_modules/ansi-regex": {
@@ -200,16 +143,6 @@
         "postcss": "^8.1.0"
       }
     },
-    "node_modules/balanced-match": {
-      "version": "4.0.4",
-      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-4.0.4.tgz",
-      "integrity": "sha512-BLrgEcRTwX2o6gGxGOCNyMvGSp35YofuYzw9h1IMTRmKqttAZZVU67bdb9Pr2vUHA8+j3i2tJfjO6C6+4myGTA==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": "18 || 20 || >=22"
-      }
-    },
     "node_modules/baseline-browser-mapping": {
       "version": "2.11.22",
       "resolved": "https://registry.npmjs.org/baseline-browser-mapping/-/baseline-browser-mapping-2.11.22.tgz",
@@ -235,19 +168,6 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
-    "node_modules/brace-expansion": {
-      "version": "5.0.12",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-5.0.12.tgz",
-      "integrity": "sha512-YovQ3rzhaLMIrDjNDMkNS01tea93qhEhG5xy8f6+R0l+dw3Ki+5sCoIoI942iuLZTHWogWktgwVDhU09iNEimQ==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "balanced-match": "^4.0.2"
-      },
-      "engines": {
-        "node": "20 || >=22"
-      }
-    },
     "node_modules/braces": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/braces/-/braces-3.0.3.tgz",
@@ -376,24 +296,11 @@
       "resolved": "https://registry.npmjs.org/commander/-/commander-12.1.0.tgz",
       "integrity": "sha512-Vw8qHK3bZM9y/P10u3Vib8o/DdkvA2OtPtZvD871QKjy74Wj1WSKFILMPRPSdUSx5RFK1arlJzEtA4PkFgnbuA==",
       "dev": true,
+      "license": "MIT",
       "engines": {
         "node": ">=18"
       }
     },
-    "node_modules/cross-spawn": {
-      "version": "7.0.6",
-      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.6.tgz",
-      "integrity": "sha512-uV2QOWP2nWzsy2aMp8aRibhi9dlzF5Hgh5SHaB9OiTGEyDTiJJyx0uy51QXdyWbtAHNua4XJzUKca3OzKUd3vA==",
-      "dev": true,
-      "dependencies": {
-        "path-key": "^3.1.0",
-        "shebang-command": "^2.0.0",
-        "which": "^2.0.1"
-      },
-      "engines": {
-        "node": ">= 8"
-      }
-    },
     "node_modules/cssesc": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/cssesc/-/cssesc-3.0.0.tgz",
@@ -415,12 +322,6 @@
         "node": ">=4"
       }
     },
-    "node_modules/eastasianwidth": {
-      "version": "0.2.0",
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-      "bin": {
-        "node-which": "bin/node-which"
-      },
-      "engines": {
-        "node": ">= 8"
-      }
-    },
     "node_modules/wrap-ansi": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
@@ -1278,24 +1073,6 @@
         "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
       }
     },
-    "node_modules/wrap-ansi-cjs": {
-      "name": "wrap-ansi",
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
-      "integrity": "sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==",
-      "dev": true,
-      "dependencies": {
-        "ansi-styles": "^4.0.0",
-        "string-width": "^4.1.0",
-        "strip-ansi": "^6.0.0"
-      },
-      "engines": {
-        "node": ">=10"
-      },
-      "funding": {
-        "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
-      }
-    },
     "node_modules/y18n": {
       "version": "5.0.8",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
diff --git a/site/package.json b/site/package.json
index 36a885e5..4e1f9943 100644
--- a/site/package.json
+++ b/site/package.json
@@ -9,7 +9,7 @@
   "author": "",
   "license": "ISC",
   "devDependencies": {
-    "@fullhuman/postcss-purgecss": "^7.0.2",
+    "@fullhuman/postcss-purgecss": "^8.0.0",
     "autoprefixer": "^10.5.0",
     "intl-tel-input": "18.2.1",
     "postcss": "^8.5.14",