diff --git a/.taskfiles/frontend.yml b/.taskfiles/frontend.yml
index 6a3e394f6d..e737f897f2 100644
--- a/.taskfiles/frontend.yml
+++ b/.taskfiles/frontend.yml
@@ -263,6 +263,16 @@ tasks:
       - task: lint:eslint
       - task: lint:dpdm
       - task: lint:colors
+      - task: lint:css
+
+  lint:css:
+    desc: "Lint stylesheets for duplicate selectors"
+    deps: [install]
+    cmds:
+      # Covers the whole editor tree, including the portal/processor layer and
+      # public/css. Vendored CSS and build output are excluded via ignoreFiles
+      # in stylelint.config.mjs.
+      - npx stylelint "editor/**/*.css"
 
   lint:colors:
     desc: "Enforce theme tokens — no hardcoded colours or raw primitives in components"
diff --git a/frontend/editor/public/css/cookieconsentCustomisation.css b/frontend/editor/public/css/cookieconsentCustomisation.css
index 25ec0fd527..78fd3d13d4 100644
--- a/frontend/editor/public/css/cookieconsentCustomisation.css
+++ b/frontend/editor/public/css/cookieconsentCustomisation.css
@@ -130,21 +130,35 @@
   opacity: 0 !important; /* Keep invisible but functional */
 }
 
+/* Track: flat fill in both themes, no outline ring or border */
 #cc-main .toggle__icon {
   display: flex !important;
   align-items: center !important;
   justify-content: flex-start !important;
+  background: var(--cc-toggle-off-bg) !important;
+  border: none !important;
+  box-shadow: none !important;
+  transition: background-color 150ms ease !important;
 }
 
+/* Thumb: small plain circle, vertically centred, no drop shadow */
 #cc-main .toggle__icon-circle {
   display: block !important;
   position: absolute !important;
-  transition: transform 0.25s ease !important;
+  width: 14px !important;
+  height: 14px !important;
+  top: 3px !important;
+  left: 2.5px !important;
+  box-shadow: none !important;
+  transition:
+    transform 150ms ease,
+    background-color 150ms ease !important;
 }
 
+/* Mantine switches have no check/cross glyph inside the thumb */
 #cc-main .toggle__icon-on,
 #cc-main .toggle__icon-off {
-  display: flex !important;
+  display: none !important;
   align-items: center !important;
   justify-content: center !important;
   position: absolute !important;
@@ -152,15 +166,11 @@
   height: 100% !important;
 }
 
-/* Ensure toggles are visible in both themes */
-#cc-main .toggle__icon {
-  background: var(--cc-toggle-off-bg) !important;
-  border: 1px solid var(--cc-toggle-off-bg) !important;
-}
-
+/* Checked track visible in both themes, same flat Mantine look */
 #cc-main .section__toggle:checked ~ .toggle__icon {
   background: var(--cc-toggle-on-bg) !important;
-  border: 1px solid var(--cc-toggle-on-bg) !important;
+  border: none !important;
+  box-shadow: none !important;
 }
 
 /* Ensure toggle text is visible */
@@ -226,18 +236,6 @@
   border-radius: 1000px !important;
 }
 
-/* Track: flat fill, no outline ring or border */
-#cc-main .toggle__icon {
-  border: none !important;
-  box-shadow: none !important;
-  transition: background-color 150ms ease !important;
-}
-
-#cc-main .section__toggle:checked ~ .toggle__icon {
-  border: none !important;
-  box-shadow: none !important;
-}
-
 /* Always-enabled categories = Mantine disabled switch (must out-prioritise
    the !important checked-track rule above) */
 #cc-main .section__toggle:checked:disabled ~ .toggle__icon {
@@ -250,25 +248,7 @@
   cursor: not-allowed !important;
 }
 
-/* Thumb: small plain circle, vertically centred, no drop shadow */
-#cc-main .toggle__icon-circle {
-  width: 14px !important;
-  height: 14px !important;
-  top: 3px !important;
-  left: 2.5px !important;
-  box-shadow: none !important;
-  transition:
-    transform 150ms ease,
-    background-color 150ms ease !important;
-}
-
 /* Checked thumb travel: 38 − 14 − 2.5 = 21.5px end position */
 #cc-main .section__toggle:checked ~ .toggle__icon .toggle__icon-circle {
   transform: translateX(19px) !important;
 }
-
-/* Mantine switches have no check/cross glyph inside the thumb */
-#cc-main .toggle__icon-on,
-#cc-main .toggle__icon-off {
-  display: none !important;
-}
diff --git a/frontend/editor/src/core/components/fileEditor/FileEditor.module.css b/frontend/editor/src/core/components/fileEditor/FileEditor.module.css
index aa89d250e1..c5770f1ea7 100644
--- a/frontend/editor/src/core/components/fileEditor/FileEditor.module.css
+++ b/frontend/editor/src/core/components/fileEditor/FileEditor.module.css
@@ -320,11 +320,6 @@
   color: var(--c-text-muted); /* subtitle text */
 }
 
-/* Light mode selected header stroke override */
-:global([data-mantine-color-scheme="light"]) .card[data-selected="true"] {
-  outline-color: var(--c-primary);
-}
-
 /* =========================
    Add File Card Styles
    ========================= */
diff --git a/frontend/editor/src/core/components/filesPage/FilesPage.css b/frontend/editor/src/core/components/filesPage/FilesPage.css
index dfdb35dcb7..9de4a276aa 100644
--- a/frontend/editor/src/core/components/filesPage/FilesPage.css
+++ b/frontend/editor/src/core/components/filesPage/FilesPage.css
@@ -156,6 +156,11 @@
   flex-shrink: 0;
   flex-wrap: wrap;
   min-height: 3rem;
+  /* Safety net - the content should always fit thanks to the shrink rules on
+     `.files-page-toolbar-actions` below, but if a future addition ever breaks
+     that, this stops the action group bleeding into sibling areas (notably the
+     details panel on the right). */
+  overflow-x: hidden;
 }
 
 .files-page-toolbar-info {
@@ -210,13 +215,6 @@
 .files-page-toolbar-actions .mantine-SegmentedControl-root {
   flex-shrink: 0;
 }
-/* Clip overflow on the toolbar itself as a safety net - the content
-   should always fit thanks to the rules above, but if a future addition
-   ever breaks that, this prevents the action group from bleeding into
-   sibling areas (notably the details panel on the right). */
-.files-page-toolbar {
-  overflow-x: hidden;
-}
 
 .files-page-toolbar-divider {
   width: 1px;
@@ -1319,9 +1317,6 @@
     gap: 0.3rem;
     flex-wrap: nowrap;
   }
-  .files-page-search {
-    flex: 1 1 100%;
-  }
   .files-page-breadcrumbs {
     font-size: 0.85rem;
     flex-wrap: nowrap;
diff --git a/frontend/editor/src/core/components/shared/FileSidebar.css b/frontend/editor/src/core/components/shared/FileSidebar.css
index 5832609680..7dce3d32b9 100644
--- a/frontend/editor/src/core/components/shared/FileSidebar.css
+++ b/frontend/editor/src/core/components/shared/FileSidebar.css
@@ -447,19 +447,14 @@
 }
 
 .file-sidebar-section-header {
+  position: relative;
   display: flex;
   align-items: center;
   justify-content: space-between;
   gap: 8px;
-  padding: 12px 14px 6px 14px;
+  padding: 10px 14px 6px 14px;
   margin: 4px 0 0 0;
-}
-
-.file-sidebar-section-header {
-  position: relative;
   border-top: 1px solid var(--c-border-subtle);
-  padding-top: 10px;
-  margin-top: 4px;
   flex-shrink: 0;
 }
 
diff --git a/frontend/editor/src/core/components/shared/FileSidebarFileItem.css b/frontend/editor/src/core/components/shared/FileSidebarFileItem.css
index 4d742f7be6..d43385ece0 100644
--- a/frontend/editor/src/core/components/shared/FileSidebarFileItem.css
+++ b/frontend/editor/src/core/components/shared/FileSidebarFileItem.css
@@ -56,12 +56,6 @@
   pointer-events: auto;
 }
 
-/* Always reserve space for action buttons so file name truncation dots (...)
-   never bleed under action buttons or overlap their outline/focus box. */
-.file-sidebar-file-info {
-  padding-right: 3.75rem;
-}
-
 .file-sidebar-file-item:hover:not(.selected) {
   background-color: color-mix(in srgb, var(--c-primary) 6%, transparent);
 }
@@ -173,6 +167,9 @@
 .file-sidebar-file-info {
   flex: 1;
   min-width: 0;
+  /* Always reserve space for action buttons so file name truncation dots (...)
+     never bleed under action buttons or overlap their outline/focus box. */
+  padding-right: 3.75rem;
 }
 
 .file-sidebar-file-name {
diff --git a/frontend/editor/src/core/components/tools/ToolPanel.css b/frontend/editor/src/core/components/tools/ToolPanel.css
index 8a2d17f3fa..5ba31e5b86 100644
--- a/frontend/editor/src/core/components/tools/ToolPanel.css
+++ b/frontend/editor/src/core/components/tools/ToolPanel.css
@@ -9,113 +9,6 @@
   flex-shrink: 0;
 }
 
-/* CSS Custom Properties for Fullscreen Mode */
-.tool-panel__fullscreen-surface-inner {
-  --fullscreen-bg-surface-1: color-mix(
-    in srgb,
-    var(--c-bg-raised) 96%,
-    transparent
-  );
-  --fullscreen-bg-surface-2: color-mix(in srgb, var(--c-bg) 90%, transparent);
-  --fullscreen-bg-header: var(--c-bg-raised);
-  --fullscreen-bg-controls-1: var(--c-bg-raised);
-  --fullscreen-bg-controls-2: color-mix(
-    in srgb,
-    var(--c-bg-raised) 95%,
-    var(--c-bg)
-  );
-  --fullscreen-bg-body-1: color-mix(in srgb, var(--c-bg) 86%, transparent);
-  --fullscreen-bg-body-2: color-mix(
-    in srgb,
-    var(--c-bg-raised) 78%,
-    transparent
-  );
-  --fullscreen-bg-group: color-mix(
-    in srgb,
-    var(--c-bg-raised) 82%,
-    transparent
-  );
-  --fullscreen-bg-item: color-mix(in srgb, var(--c-bg-raised) 88%, transparent);
-  --fullscreen-bg-list-item: color-mix(
-    in srgb,
-    var(--c-bg-raised) 86%,
-    transparent
-  );
-  --fullscreen-bg-icon-detailed: color-mix(
-    in srgb,
-    var(--c-surface-sunken) 75%,
-    transparent
-  );
-  --fullscreen-bg-icon-compact: color-mix(
-    in srgb,
-    var(--c-surface-sunken) 70%,
-    transparent
-  );
-  --fullscreen-border-subtle-75: color-mix(
-    in srgb,
-    var(--c-border-subtle) 75%,
-    transparent
-  );
-  --fullscreen-border-subtle-70: color-mix(
-    in srgb,
-    var(--c-border-subtle) 70%,
-    transparent
-  );
-  --fullscreen-border-subtle-65: color-mix(
-    in srgb,
-    var(--c-border-subtle) 65%,
-    transparent
-  );
-  --fullscreen-border-favorites: color-mix(
-    in srgb,
-    var(--special-color-favorites) 25%,
-    var(--c-border-subtle)
-  );
-  --fullscreen-border-recommended: color-mix(
-    in srgb,
-    var(--special-color-recommended) 25%,
-    var(--c-border-subtle)
-  );
-  --fullscreen-shadow-primary: color-mix(
-    in srgb,
-    var(--shadow-color, color-mix(in srgb, black 55%, transparent)) 25%,
-    transparent
-  );
-  --fullscreen-shadow-secondary: color-mix(
-    in srgb,
-    var(--shadow-color, color-mix(in srgb, black 35%, transparent)) 30%,
-    transparent
-  );
-  --fullscreen-shadow-group: color-mix(
-    in srgb,
-    var(--shadow-color, color-mix(in srgb, black 45%, transparent)) 18%,
-    transparent
-  );
-  --fullscreen-accent-hover: color-mix(
-    in srgb,
-    var(--c-text) 20%,
-    var(--c-border-subtle)
-  );
-  --fullscreen-accent-selected: color-mix(
-    in srgb,
-    var(--c-text) 30%,
-    var(--c-border-subtle)
-  );
-  --fullscreen-accent-ring: color-mix(in srgb, var(--c-text) 15%, transparent);
-  --fullscreen-accent-list-bg: color-mix(
-    in srgb,
-    var(--c-text) 8%,
-    var(--c-bg-raised)
-  );
-  --fullscreen-accent-list-border: color-mix(
-    in srgb,
-    var(--c-text) 20%,
-    var(--c-border-subtle)
-  );
-  --fullscreen-text-icon: var(--c-text);
-  --fullscreen-text-icon-compact: var(--c-text);
-}
-
 .tool-panel {
   position: relative;
   transition:
@@ -373,6 +266,110 @@
   --fullscreen-anim-out-duration: var(--fullscreen-anim-duration-out);
   animation: tool-panel-fullscreen-slide-in var(--fullscreen-anim-in-duration)
     ease forwards;
+
+  --fullscreen-bg-surface-1: color-mix(
+    in srgb,
+    var(--c-bg-raised) 96%,
+    transparent
+  );
+  --fullscreen-bg-surface-2: color-mix(in srgb, var(--c-bg) 90%, transparent);
+  --fullscreen-bg-header: var(--c-bg-raised);
+  --fullscreen-bg-controls-1: var(--c-bg-raised);
+  --fullscreen-bg-controls-2: color-mix(
+    in srgb,
+    var(--c-bg-raised) 95%,
+    var(--c-bg)
+  );
+  --fullscreen-bg-body-1: color-mix(in srgb, var(--c-bg) 86%, transparent);
+  --fullscreen-bg-body-2: color-mix(
+    in srgb,
+    var(--c-bg-raised) 78%,
+    transparent
+  );
+  --fullscreen-bg-group: color-mix(
+    in srgb,
+    var(--c-bg-raised) 82%,
+    transparent
+  );
+  --fullscreen-bg-item: color-mix(in srgb, var(--c-bg-raised) 88%, transparent);
+  --fullscreen-bg-list-item: color-mix(
+    in srgb,
+    var(--c-bg-raised) 86%,
+    transparent
+  );
+  --fullscreen-bg-icon-detailed: color-mix(
+    in srgb,
+    var(--c-surface-sunken) 75%,
+    transparent
+  );
+  --fullscreen-bg-icon-compact: color-mix(
+    in srgb,
+    var(--c-surface-sunken) 70%,
+    transparent
+  );
+  --fullscreen-border-subtle-75: color-mix(
+    in srgb,
+    var(--c-border-subtle) 75%,
+    transparent
+  );
+  --fullscreen-border-subtle-70: color-mix(
+    in srgb,
+    var(--c-border-subtle) 70%,
+    transparent
+  );
+  --fullscreen-border-subtle-65: color-mix(
+    in srgb,
+    var(--c-border-subtle) 65%,
+    transparent
+  );
+  --fullscreen-border-favorites: color-mix(
+    in srgb,
+    var(--special-color-favorites) 25%,
+    var(--c-border-subtle)
+  );
+  --fullscreen-border-recommended: color-mix(
+    in srgb,
+    var(--special-color-recommended) 25%,
+    var(--c-border-subtle)
+  );
+  --fullscreen-shadow-primary: color-mix(
+    in srgb,
+    var(--shadow-color, color-mix(in srgb, black 55%, transparent)) 25%,
+    transparent
+  );
+  --fullscreen-shadow-secondary: color-mix(
+    in srgb,
+    var(--shadow-color, color-mix(in srgb, black 35%, transparent)) 30%,
+    transparent
+  );
+  --fullscreen-shadow-group: color-mix(
+    in srgb,
+    var(--shadow-color, color-mix(in srgb, black 45%, transparent)) 18%,
+    transparent
+  );
+  --fullscreen-accent-hover: color-mix(
+    in srgb,
+    var(--c-text) 20%,
+    var(--c-border-subtle)
+  );
+  --fullscreen-accent-selected: color-mix(
+    in srgb,
+    var(--c-text) 30%,
+    var(--c-border-subtle)
+  );
+  --fullscreen-accent-ring: color-mix(in srgb, var(--c-text) 15%, transparent);
+  --fullscreen-accent-list-bg: color-mix(
+    in srgb,
+    var(--c-text) 8%,
+    var(--c-bg-raised)
+  );
+  --fullscreen-accent-list-border: color-mix(
+    in srgb,
+    var(--c-text) 20%,
+    var(--c-border-subtle)
+  );
+  --fullscreen-text-icon: var(--c-text);
+  --fullscreen-text-icon-compact: var(--c-text);
 }
 
 .tool-panel__fullscreen-surface-inner--exiting {
@@ -428,8 +425,15 @@
   flex: 1 1 auto;
 }
 
+/* Used by both FullscreenToolSurface and DetailedToolItem. */
 .tool-panel__fullscreen-body {
-  flex: 1;
+  display: flex;
+  flex-direction: column;
+  gap: 0.4rem;
+  text-align: left;
+  /* Prevent long content (names, descriptions, shortcuts) from overflowing */
+  flex: 1 1 auto;
+  min-width: 0;
   min-height: 0;
   background: transparent;
 }
@@ -639,16 +643,6 @@
   z-index: var(--z-fullscreen-icon-svg);
 }
 
-.tool-panel__fullscreen-body {
-  display: flex;
-  flex-direction: column;
-  gap: 0.4rem;
-  text-align: left;
-  /* Prevent long content (names, descriptions, shortcuts) from overflowing */
-  flex: 1 1 auto;
-  min-width: 0;
-}
-
 .tool-panel__fullscreen-name {
   color: var(--c-text);
   font-size: 13px !important;
diff --git a/frontend/editor/src/core/components/tools/addPageNumbers/PageNumberPreview.module.css b/frontend/editor/src/core/components/tools/addPageNumbers/PageNumberPreview.module.css
index d2ae85a88b..34760f83f2 100644
--- a/frontend/editor/src/core/components/tools/addPageNumbers/PageNumberPreview.module.css
+++ b/frontend/editor/src/core/components/tools/addPageNumbers/PageNumberPreview.module.css
@@ -52,6 +52,7 @@
   user-select: none;
   font-weight: 600;
   position: relative;
+  padding: 8px;
 }
 
 /* Position numbers at edges within each tile with extra top/bottom spacing */
@@ -98,11 +99,6 @@
   padding-bottom: 4px;
 } /* bottom-right */
 
-/* Base padding for all tiles */
-.gridTile {
-  padding: 8px;
-}
-
 .gridTileSelected,
 .gridTileHovered {
   border: 2px solid var(--c-primary);
diff --git a/frontend/editor/src/core/components/tools/compare/compareView.css b/frontend/editor/src/core/components/tools/compare/compareView.css
index aaa703fcc1..c33abfc0ca 100644
--- a/frontend/editor/src/core/components/tools/compare/compareView.css
+++ b/frontend/editor/src/core/components/tools/compare/compareView.css
@@ -1,5 +1,6 @@
 .compare-dropdown-scrollwrap {
   position: relative;
+  margin: 0;
 }
 
 .compare-dropdown-sticky {
@@ -138,20 +139,11 @@
   border-radius: 8px !important; /* match dropdown container radius */
 }
 
-/* Ensure options text uses full width inside wider dropdown */
-.compare-dropdown-option__text {
-  max-width: 100%;
-}
-
 /* Remove default padding inside Mantine options list so sticky header touches edges */
 .compare-changes-dropdown .mantine-Combobox-options {
   padding: 0 !important;
 }
 
-.compare-dropdown-scrollwrap {
-  margin: 0;
-}
-
 /* Ensure search field sits flush and does not overflow */
 .compare-changes-dropdown .mantine-Combobox-search {
   box-sizing: border-box;
@@ -435,6 +427,7 @@
   overflow: hidden;
   text-overflow: ellipsis;
   line-clamp: 3;
+  max-width: 100%;
 }
 
 /* Non-sticky in-flow group headers; sticky handled by floating header */
diff --git a/frontend/editor/src/core/components/tools/validateSignature/reportView/styles.css b/frontend/editor/src/core/components/tools/validateSignature/reportView/styles.css
index b4c9e1c815..e6cb96be3b 100644
--- a/frontend/editor/src/core/components/tools/validateSignature/reportView/styles.css
+++ b/frontend/editor/src/core/components/tools/validateSignature/reportView/styles.css
@@ -8,13 +8,14 @@
   display: flex;
   flex-direction: column;
   gap: 4px;
+  color: var(--c-text) !important;
 }
 
 .field-value {
-  border: 1px solid rgb(var(--pdf-light-box-border));
+  border: 1px solid var(--c-border) !important;
   border-radius: 8px;
   padding: 0.65rem 0.75rem;
-  background-color: rgb(var(--pdf-light-box-bg));
+  background-color: var(--c-surface-raised) !important;
   min-height: 44px;
 }
 
@@ -65,16 +66,6 @@
   overflow-y: auto;
 }
 
-/* Keep field blocks stable colors across themes */
-.field-value {
-  border: 1px solid var(--c-border) !important;
-  background-color: var(--c-surface-raised) !important;
-}
-
-.field-container {
-  color: var(--c-text) !important;
-}
-
 /* Thumbnail preview styles */
 .thumbnail-container {
   width: 140px;
diff --git a/frontend/editor/src/core/components/viewer/AttachmentSidebar.css b/frontend/editor/src/core/components/viewer/AttachmentSidebar.css
index addaca8979..1afd184bc6 100644
--- a/frontend/editor/src/core/components/viewer/AttachmentSidebar.css
+++ b/frontend/editor/src/core/components/viewer/AttachmentSidebar.css
@@ -5,6 +5,7 @@
   display: flex;
   flex-direction: column;
   gap: 0.25rem;
+  animation: attachment-fade-in 0.2s ease;
 }
 
 /* Attachment Items */
@@ -91,10 +92,6 @@
   }
 }
 
-.attachment-list {
-  animation: attachment-fade-in 0.2s ease;
-}
-
 /* Accessibility & Reduced Motion */
 @media (prefers-reduced-motion: reduce) {
   .attachment-item,
diff --git a/frontend/editor/src/core/components/viewer/BookmarkSidebar.css b/frontend/editor/src/core/components/viewer/BookmarkSidebar.css
index 5d8beab4e0..8ec9b1d1db 100644
--- a/frontend/editor/src/core/components/viewer/BookmarkSidebar.css
+++ b/frontend/editor/src/core/components/viewer/BookmarkSidebar.css
@@ -108,6 +108,7 @@
   flex-direction: column;
   gap: 0.25rem;
   margin-top: 0.25rem;
+  animation: bookmark-fade-in 0.2s ease;
 }
 
 /* Smooth expand/collapse animation */
@@ -122,10 +123,6 @@
   }
 }
 
-.bookmark-item__children {
-  animation: bookmark-fade-in 0.2s ease;
-}
-
 /* Accessibility & Reduced Motion */
 @media (prefers-reduced-motion: reduce) {
   .bookmark-item,
diff --git a/frontend/editor/src/core/components/viewer/LayerSidebar.css b/frontend/editor/src/core/components/viewer/LayerSidebar.css
index 305853ec9f..3b4394d3ad 100644
--- a/frontend/editor/src/core/components/viewer/LayerSidebar.css
+++ b/frontend/editor/src/core/components/viewer/LayerSidebar.css
@@ -100,6 +100,7 @@
     color-mix(in srgb, var(--c-border-subtle) 60%, transparent);
   margin-left: 0.875rem;
   padding-left: 0.25rem;
+  animation: layer-fade-in 0.15s ease;
 }
 
 /* Footer with Apply button */
@@ -133,10 +134,6 @@
   }
 }
 
-.layer-item__children {
-  animation: layer-fade-in 0.15s ease;
-}
-
 /* Accessibility & Reduced Motion */
 @media (prefers-reduced-motion: reduce) {
   .layer-item,
diff --git a/frontend/editor/src/core/styles/theme.css b/frontend/editor/src/core/styles/theme.css
index c8a1663b4c..de6c18614e 100644
--- a/frontend/editor/src/core/styles/theme.css
+++ b/frontend/editor/src/core/styles/theme.css
@@ -49,11 +49,9 @@
     var(--p-green-500) 30%,
     transparent
   ); /* Green border for active badge */
-}
 
-/* CSS variables for Tailwind + Mantine integration */
+  /* CSS variables for Tailwind + Mantine integration */
 
-:root {
   /* Global animation durations */
   --fullscreen-anim-duration-in: 0.28s;
   --fullscreen-anim-duration-out: 0.22s;
@@ -284,12 +282,25 @@
   --dropdown-panel-bg: var(--mantine-color-white);
   --dropdown-panel-border: var(--mantine-color-gray-4);
   --dropdown-group-label: var(--mantine-color-gray-6);
-}
 
-/* Onboarding (light mode) */
-:root {
+  /* Onboarding (light mode) */
   --onboarding-step-active: var(--p-gray-800);
   --onboarding-step-inactive: var(--p-gray-300);
+
+  /* PDF Link Overlay (viewer) */
+  --link-hover-bg: color-mix(in srgb, var(--p-blue-500) 10%, transparent);
+  --link-hover-border: color-mix(in srgb, var(--p-blue-500) 32%, transparent);
+  --link-hover-shadow:
+    inset 0 0 0 1px rgba(255, 255, 255, 0.35),
+    0 1px 4px color-mix(in srgb, var(--p-azure-500) 12%, transparent);
+  --link-focus-ring: color-mix(in srgb, var(--p-blue-500) 25%, transparent);
+  --link-toolbar-bg: color-mix(in srgb, var(--p-blue-700) 88%, transparent);
+  --link-toolbar-border: rgba(255, 255, 255, 0.1);
+  --link-toolbar-shadow:
+    0 12px 40px rgba(0, 0, 0, 0.2), 0 4px 12px rgba(0, 0, 0, 0.16),
+    0 0 0 0.5px rgba(255, 255, 255, 0.05);
+
+  --shadow-color: color-mix(in srgb, var(--p-blue-700) 55%, transparent);
 }
 
 [data-mantine-color-scheme="dark"] {
@@ -484,6 +495,19 @@
   --dropdown-panel-bg: var(--mantine-color-dark-7);
   --dropdown-panel-border: var(--mantine-color-dark-4);
   --dropdown-group-label: var(--mantine-color-dark-2);
+
+  /* PDF Link Overlay (viewer) */
+  --link-hover-bg: color-mix(in srgb, var(--p-blue-500) 14%, transparent);
+  --link-hover-border: color-mix(in srgb, var(--p-blue-500) 38%, transparent);
+  --link-hover-shadow:
+    inset 0 0 0 1px rgba(255, 255, 255, 0.1),
+    0 1px 4px color-mix(in srgb, var(--p-c-4f8ef5) 18%, transparent);
+  --link-focus-ring: color-mix(in srgb, var(--p-blue-500) 30%, transparent);
+  --link-toolbar-bg: color-mix(in srgb, var(--p-blue-700) 94%, transparent);
+  --link-toolbar-border: rgba(255, 255, 255, 0.07);
+  --link-toolbar-shadow:
+    0 12px 40px rgba(0, 0, 0, 0.5), 0 4px 12px rgba(0, 0, 0, 0.35),
+    0 0 0 0.5px rgba(255, 255, 255, 0.04);
 }
 
 /* Dropzone drop state styling */
@@ -581,34 +605,6 @@
     border-color 0.2s ease;
 }
 /* ── PDF Link Overlay (viewer) ── */
-:root {
-  --link-hover-bg: color-mix(in srgb, var(--p-blue-500) 10%, transparent);
-  --link-hover-border: color-mix(in srgb, var(--p-blue-500) 32%, transparent);
-  --link-hover-shadow:
-    inset 0 0 0 1px rgba(255, 255, 255, 0.35),
-    0 1px 4px color-mix(in srgb, var(--p-azure-500) 12%, transparent);
-  --link-focus-ring: color-mix(in srgb, var(--p-blue-500) 25%, transparent);
-  --link-toolbar-bg: color-mix(in srgb, var(--p-blue-700) 88%, transparent);
-  --link-toolbar-border: rgba(255, 255, 255, 0.1);
-  --link-toolbar-shadow:
-    0 12px 40px rgba(0, 0, 0, 0.2), 0 4px 12px rgba(0, 0, 0, 0.16),
-    0 0 0 0.5px rgba(255, 255, 255, 0.05);
-}
-
-[data-mantine-color-scheme="dark"] {
-  --link-hover-bg: color-mix(in srgb, var(--p-blue-500) 14%, transparent);
-  --link-hover-border: color-mix(in srgb, var(--p-blue-500) 38%, transparent);
-  --link-hover-shadow:
-    inset 0 0 0 1px rgba(255, 255, 255, 0.1),
-    0 1px 4px color-mix(in srgb, var(--p-c-4f8ef5) 18%, transparent);
-  --link-focus-ring: color-mix(in srgb, var(--p-blue-500) 30%, transparent);
-  --link-toolbar-bg: color-mix(in srgb, var(--p-blue-700) 94%, transparent);
-  --link-toolbar-border: rgba(255, 255, 255, 0.07);
-  --link-toolbar-shadow:
-    0 12px 40px rgba(0, 0, 0, 0.5), 0 4px 12px rgba(0, 0, 0, 0.35),
-    0 0 0 0.5px rgba(255, 255, 255, 0.04);
-}
-
 /* ── Link hit-area ── */
 .pdf-link-overlay {
   position: absolute;
@@ -739,28 +735,13 @@
 
 .pdf-link-toolbar-btn:hover {
   background: rgba(255, 255, 255, 0.08);
-}
-
-.pdf-link-toolbar-btn--delete:hover {
-  background: color-mix(in srgb, var(--p-red-500) 15%, transparent);
-  color: var(--p-art-red-light);
-}
-
-.pdf-link-toolbar-sep {
-  width: 1px;
-  height: 12px;
-  background: rgba(255, 255, 255, 0.12);
-  margin: 0 4px;
+  color: #fff;
 }
 
 .pdf-link-toolbar-btn:last-child {
   border-radius: 0 9px 9px 0;
 }
 
-.pdf-link-toolbar-btn:hover {
-  color: #fff;
-}
-
 .pdf-link-toolbar-btn--delete {
   padding: 0 10px;
 }
@@ -770,25 +751,22 @@
   color: var(--p-red-400);
 }
 
-.pdf-link-toolbar-btn--go:hover {
-  background: rgba(255, 255, 255, 0.08);
-}
-
 .pdf-link-toolbar-btn--go {
   min-width: 0;
 }
 
+.pdf-link-toolbar-btn--go:hover {
+  background: rgba(255, 255, 255, 0.08);
+}
+
 .pdf-link-toolbar-sep {
   width: 1px;
   height: 16px;
   background: rgba(255, 255, 255, 0.1);
+  margin: 0 4px;
   flex-shrink: 0;
 }
 
-:root {
-  --shadow-color: color-mix(in srgb, var(--p-blue-700) 55%, transparent);
-}
-
 [data-theme="dark"] {
   --shadow-color: rgba(0, 0, 0, 0.88);
 }
diff --git a/frontend/editor/src/core/tokens/tokens.css b/frontend/editor/src/core/tokens/tokens.css
index 6f4a5f5204..c36fae35fc 100644
--- a/frontend/editor/src/core/tokens/tokens.css
+++ b/frontend/editor/src/core/tokens/tokens.css
@@ -153,6 +153,27 @@
     var(--p-red-500) 50%,
     var(--p-red-600) 100%
   );
+
+  /* Code palette — theme-aware: a light GitHub-style box in light mode, the
+     dark terminal palette in dark mode. (CodeBlock renders plain text, so only
+     the base colours are load-bearing; the syntax slots are kept for future
+     Shiki. */
+  --code-bg: var(--p-c-f6f8fa);
+  --code-bg-alt: var(--p-c-eef1f4);
+  --code-bg-header: var(--p-c-eaeef2);
+  --code-text: var(--p-c-1f2328);
+  --code-dim: var(--p-c-656d76);
+  --code-muted: var(--p-c-8c959f);
+  --code-keyword: var(--p-c-cf222e);
+  --code-string: var(--p-code-string);
+  --code-number: var(--p-c-0550ae);
+  --code-fn: var(--p-c-8250df);
+  --code-type: var(--p-code-type);
+  --code-property: var(--p-c-0550ae);
+  --code-comment: var(--p-c-6e7781);
+  --code-border: var(--p-c-d0d7de);
+  /* Window-chrome traffic-light dots in the code-block header. */
+  --code-dot: var(--p-c-d0d7de);
 }
 
 [data-theme="dark"] {
@@ -224,31 +245,8 @@
     var(--p-blue-600) 50%,
     var(--p-blue-700) 100%
   );
-}
 
-/* Code palette — theme-aware: a light GitHub-style box in light mode, the dark
-   terminal palette in dark mode. (CodeBlock renders plain text, so only the
-   base colours are load-bearing; the syntax slots are kept for future Shiki. */
-:root,
-[data-theme="light"] {
-  --code-bg: var(--p-c-f6f8fa);
-  --code-bg-alt: var(--p-c-eef1f4);
-  --code-bg-header: var(--p-c-eaeef2);
-  --code-text: var(--p-c-1f2328);
-  --code-dim: var(--p-c-656d76);
-  --code-muted: var(--p-c-8c959f);
-  --code-keyword: var(--p-c-cf222e);
-  --code-string: var(--p-code-string);
-  --code-number: var(--p-c-0550ae);
-  --code-fn: var(--p-c-8250df);
-  --code-type: var(--p-code-type);
-  --code-property: var(--p-c-0550ae);
-  --code-comment: var(--p-c-6e7781);
-  --code-border: var(--p-c-d0d7de);
-  /* Window-chrome traffic-light dots in the code-block header. */
-  --code-dot: var(--p-c-d0d7de);
-}
-[data-theme="dark"] {
+  /* Code palette */
   --code-bg: var(--p-c-0f172a);
   --code-bg-alt: var(--p-c-1e293b);
   --code-bg-header: var(--p-c-1a2332);
diff --git a/frontend/editor/src/core/ui/Checkbox.css b/frontend/editor/src/core/ui/Checkbox.css
index f20358f1aa..44082d51d9 100644
--- a/frontend/editor/src/core/ui/Checkbox.css
+++ b/frontend/editor/src/core/ui/Checkbox.css
@@ -61,18 +61,16 @@
 .sui-check--mixed .sui-check__tick {
   opacity: 0;
 }
-.sui-check--mixed .sui-check__dash {
-  position: absolute;
-  width: 0.5rem;
-  height: 2px;
-  background: var(--color-text-on-accent);
-  border-radius: 1px;
-}
 .sui-check__dash {
   display: none;
 }
 .sui-check--mixed .sui-check__dash {
   display: block;
+  position: absolute;
+  width: 0.5rem;
+  height: 2px;
+  background: var(--color-text-on-accent);
+  border-radius: 1px;
 }
 
 .sui-check__icon {
diff --git a/frontend/editor/src/portal/components/billing/billing.css b/frontend/editor/src/portal/components/billing/billing.css
index cfcbf50697..2f39fa0506 100644
--- a/frontend/editor/src/portal/components/billing/billing.css
+++ b/frontend/editor/src/portal/components/billing/billing.css
@@ -1276,10 +1276,12 @@
   flex-direction: column;
   gap: 1.25rem;
 }
+/* Shared by the calculator and payment steps, kept compact so the payment step
+   fits without scrolling. */
 .portal-billing__bundle-fields {
   display: flex;
   flex-direction: column;
-  gap: 1rem;
+  gap: 0.625rem;
 }
 .portal-billing__bundle-field-label {
   font-size: 0.8125rem;
@@ -1460,12 +1462,6 @@
   padding-top: 0.75rem;
   border-top: 1px solid var(--c-border-subtle);
 }
-/* Recipient fields on the payment step, kept compact so the step fits without scrolling. */
-.portal-billing__bundle-fields {
-  display: flex;
-  flex-direction: column;
-  gap: 0.625rem;
-}
 /* Company name + PO number share a row. */
 .portal-billing__bundle-field-row {
   display: flex;
diff --git a/frontend/editor/src/portal/views/Sources.css b/frontend/editor/src/portal/views/Sources.css
index 5ca4064e65..132c137c89 100644
--- a/frontend/editor/src/portal/views/Sources.css
+++ b/frontend/editor/src/portal/views/Sources.css
@@ -560,70 +560,6 @@
   outline-offset: -1px;
 }
 
-.portal-sources__connections {
-  margin-top: 1.5rem;
-}
-
-.portal-sources__connections-title {
-  font-size: 0.875rem;
-  font-weight: 600;
-  color: var(--c-text-muted);
-  margin: 0 0 0.5rem;
-}
-
-.portal-sources__connections-list {
-  list-style: none;
-  margin: 0;
-  padding: 0;
-  display: flex;
-  flex-direction: column;
-  gap: 0.25rem;
-}
-
-.portal-sources__connections-row {
-  display: flex;
-  align-items: center;
-  gap: 0.75rem;
-  padding: 0.375rem 0;
-  border-bottom: 1px solid var(--color-border-2);
-}
-
-.portal-sources__connections-name {
-  font-weight: 500;
-  color: var(--c-text);
-}
-
-.portal-sources__connections-bucket {
-  color: var(--c-text-subtle);
-  font-size: 0.8125rem;
-}
-
-.portal-sources__connections-actions {
-  margin-left: auto;
-  display: flex;
-  gap: 0.25rem;
-}
-
-.portal-sources__connections-head {
-  display: flex;
-  align-items: center;
-  justify-content: space-between;
-  gap: 1rem;
-  margin-bottom: 0.5rem;
-}
-
-.portal-sources__connections-sub {
-  color: var(--c-text-subtle);
-  font-size: 0.875rem;
-  margin: 0;
-}
-
-.portal-sources__connections-actions {
-  display: inline-flex;
-  gap: 0.25rem;
-  justify-content: flex-end;
-}
-
 /* ---- Integration picker ---------------------------------------------------------------------
    A searchable grid of what we can connect to. Sized so a full category is visible without
    scrolling on a laptop, and so the search box is the first thing focus lands on. */
diff --git a/frontend/editor/src/proprietary/auth/ui/auth.css b/frontend/editor/src/proprietary/auth/ui/auth.css
index e4337af2d6..9bc175efdd 100644
--- a/frontend/editor/src/proprietary/auth/ui/auth.css
+++ b/frontend/editor/src/proprietary/auth/ui/auth.css
@@ -766,12 +766,6 @@
   min-height: 0;
 }
 
-.oauth-container-fullwidth {
-  display: flex;
-  flex-direction: column;
-  gap: 0.75rem;
-}
-
 .oauth-button-fullwidth {
   width: 100%;
   display: flex;
diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index 86c998e997..1838e5637d 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -132,6 +132,7 @@
         "puppeteer": "^24.25.0",
         "rollup-plugin-visualizer": "^7.0.1",
         "storybook": "^9.1.20",
+        "stylelint": "^17.14.1",
         "tsx": "^4.22.4",
         "typescript": "npm:@typescript/typescript6@^6.0.2",
         "typescript-eslint": "^8.61.1",
@@ -546,6 +547,67 @@
         "node": ">=18"
       }
     },
+    "node_modules/@cacheable/memory": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/@cacheable/memory/-/memory-2.2.0.tgz",
+      "integrity": "sha512-CTLKqLItRCEixEAewD3/j9DB3/o96gpTPD4eJ1v+DGOlxZRZncRQkGYqqnAGCscYd6RNeXfGeiuCphsPtqyIfQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@cacheable/utils": "^2.5.0",
+        "@keyv/bigmap": "^1.3.1",
+        "hookified": "^1.15.1",
+        "keyv": "^5.6.0"
+      }
+    },
+    "node_modules/@cacheable/memory/node_modules/@keyv/bigmap": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/@keyv/bigmap/-/bigmap-1.3.1.tgz",
+      "integrity": "sha512-WbzE9sdmQtKy8vrNPa9BRnwZh5UF4s1KTmSK0KUVLo3eff5BlQNNWDnFOouNpKfPKDnms9xynJjsMYjMaT/aFQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "hashery": "^1.4.0",
+        "hookified": "^1.15.0"
+      },
+      "engines": {
+        "node": ">= 18"
+      },
+      "peerDependencies": {
+        "keyv": "^5.6.0"
+      }
+    },
+    "node_modules/@cacheable/memory/node_modules/keyv": {
+      "version": "5.6.0",
+      "resolved": "https://registry.npmjs.org/keyv/-/keyv-5.6.0.tgz",
+      "integrity": "sha512-CYDD3SOtsHtyXeEORYRx2qBtpDJFjRTGXUtmNEMGyzYOKj1TE3tycdlho7kA1Ufx9OYWZzg52QFBGALTirzDSw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@keyv/serialize": "^1.1.1"
+      }
+    },
+    "node_modules/@cacheable/utils": {
+      "version": "2.5.0",
+      "resolved": "https://registry.npmjs.org/@cacheable/utils/-/utils-2.5.0.tgz",
+      "integrity": "sha512-buipgOVDkkPXNR5+xBpDw7Zk2n1EvU7qBJCNUcL7rhQ//kfpOXPAvQ511Os0vpLYJ1pZnvudNytkQt2hst3wqA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "hashery": "^1.5.1",
+        "keyv": "^5.6.0"
+      }
+    },
+    "node_modules/@cacheable/utils/node_modules/keyv": {
+      "version": "5.6.0",
+      "resolved": "https://registry.npmjs.org/keyv/-/keyv-5.6.0.tgz",
+      "integrity": "sha512-CYDD3SOtsHtyXeEORYRx2qBtpDJFjRTGXUtmNEMGyzYOKj1TE3tycdlho7kA1Ufx9OYWZzg52QFBGALTirzDSw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@keyv/serialize": "^1.1.1"
+      }
+    },
     "node_modules/@cantoo/pdf-lib": {
       "version": "2.6.5",
       "resolved": "https://registry.npmjs.org/@cantoo/pdf-lib/-/pdf-lib-2.6.5.tgz",
@@ -582,9 +644,9 @@
       }
     },
     "node_modules/@csstools/css-calc": {
-      "version": "3.1.1",
-      "resolved": "https://registry.npmjs.org/@csstools/css-calc/-/css-calc-3.1.1.tgz",
-      "integrity": "sha512-HJ26Z/vmsZQqs/o3a6bgKslXGFAungXGbinULZO3eMsOyNJHeBBZfup5FiZInOghgoM4Hwnmw+OgbJCNg1wwUQ==",
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/@csstools/css-calc/-/css-calc-3.3.0.tgz",
+      "integrity": "sha512-c5ihYsPkdG6JCkU2zTMm4+k6r7RXuGxtWYhu5DHMIiF1FHzrfmHL5so11AoFpUv/tu61xfcmT4AmKoFfMPoqdQ==",
       "dev": true,
       "funding": [
         {
@@ -657,9 +719,9 @@
       }
     },
     "node_modules/@csstools/css-syntax-patches-for-csstree": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/@csstools/css-syntax-patches-for-csstree/-/css-syntax-patches-for-csstree-1.1.1.tgz",
-      "integrity": "sha512-BvqN0AMWNAnLk9G8jnUT77D+mUbY/H2b3uDTvg2isJkHaOufUE2R3AOwxWo7VBQKT1lOdwdvorddo2B/lk64+w==",
+      "version": "1.1.7",
+      "resolved": "https://registry.npmjs.org/@csstools/css-syntax-patches-for-csstree/-/css-syntax-patches-for-csstree-1.1.7.tgz",
+      "integrity": "sha512-fQ+05118eQS1cofO3aJpB5efgpBZMvIzwr/sbC8kDLVA5XLG8q1kJV5yzrUAI1f7lvhPnm8fgIjzFB8/O/5Dig==",
       "dev": true,
       "funding": [
         {
@@ -701,6 +763,76 @@
         "node": ">=20.19.0"
       }
     },
+    "node_modules/@csstools/media-query-list-parser": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/@csstools/media-query-list-parser/-/media-query-list-parser-5.0.0.tgz",
+      "integrity": "sha512-T9lXmZOfnam3eMERPsszjY5NK0jX8RmThmmm99FZ8b7z8yMaFZWKwLWGZuTwdO3ddRY5fy13GmmEYZXB4I98Eg==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=20.19.0"
+      },
+      "peerDependencies": {
+        "@csstools/css-parser-algorithms": "^4.0.0",
+        "@csstools/css-tokenizer": "^4.0.0"
+      }
+    },
+    "node_modules/@csstools/selector-resolve-nested": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/@csstools/selector-resolve-nested/-/selector-resolve-nested-4.0.1.tgz",
+      "integrity": "sha512-j3vdQu0XwLME5qOTWxm8cnmvsf423R2YL6DbKklCHZwkDm7UdKNu6RPlw4REIJhSlKBICY3B70/7QZdicLqZgg==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT-0",
+      "engines": {
+        "node": ">=20.19.0"
+      },
+      "peerDependencies": {
+        "postcss-selector-parser": "^7.1.1"
+      }
+    },
+    "node_modules/@csstools/selector-specificity": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/@csstools/selector-specificity/-/selector-specificity-6.0.0.tgz",
+      "integrity": "sha512-4sSgl78OtOXEX/2d++8A83zHNTgwCJMaR24FvsYL7Uf/VS8HZk9PTwR51elTbGqMuwH3szLvvOXEaVnqn0Z3zA==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT-0",
+      "engines": {
+        "node": ">=20.19.0"
+      },
+      "peerDependencies": {
+        "postcss-selector-parser": "^7.1.1"
+      }
+    },
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+        "lodash.truncate": "^4.4.2",
+        "slice-ansi": "^4.0.0",
+        "string-width": "^4.2.3",
+        "strip-ansi": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=10.0.0"
+      }
+    },
+    "node_modules/table/node_modules/ajv": {
+      "version": "8.20.0",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-8.20.0.tgz",
+      "integrity": "sha512-Thbli+OlOj+iMPYFBVBfJ3OmCAnaSyNn4M1vz9T6Gka5Jt9ba/HIR56joy65tY6kx/FCF5VXNB819Y7/GUrBGA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "fast-deep-equal": "^3.1.3",
+        "fast-uri": "^3.0.1",
+        "json-schema-traverse": "^1.0.0",
+        "require-from-string": "^2.0.2"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/epoberezkin"
+      }
+    },
+    "node_modules/table/node_modules/emoji-regex": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
+      "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/table/node_modules/json-schema-traverse": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-1.0.0.tgz",
+      "integrity": "sha512-NM8/P9n3XjXhIZn1lLhkFaACTOURQXjWhV4BA/RnOv8xvgqtqpAX9IO4mRQxSx1Rlo4tqzeqb0sOlruaOy3dug==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/table/node_modules/string-width": {
+      "version": "4.2.3",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+      "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "emoji-regex": "^8.0.0",
+        "is-fullwidth-code-point": "^3.0.0",
+        "strip-ansi": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/table/node_modules/strip-ansi": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+      "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^5.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/tablemark": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/tablemark/-/tablemark-4.1.0.tgz",
@@ -17642,6 +18526,19 @@
       "dev": true,
       "license": "ISC"
     },
+    "node_modules/write-file-atomic": {
+      "version": "7.0.1",
+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-7.0.1.tgz",
+      "integrity": "sha512-OTIk8iR8/aCRWBqvxrzxR0hgxWpnYBblY1S5hDWBQfk/VFmJwzmJgQFN3WsoUKHISv2eAwe+PpbUzyL1CKTLXg==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "signal-exit": "^4.0.1"
+      },
+      "engines": {
+        "node": "^20.17.0 || >=22.9.0"
+      }
+    },
     "node_modules/ws": {
       "version": "8.21.0",
       "resolved": "https://registry.npmjs.org/ws/-/ws-8.21.0.tgz",
diff --git a/frontend/package.json b/frontend/package.json
index 404366383a..a527bcf06f 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -154,6 +154,7 @@
     "puppeteer": "^24.25.0",
     "rollup-plugin-visualizer": "^7.0.1",
     "storybook": "^9.1.20",
+    "stylelint": "^17.14.1",
     "tsx": "^4.22.4",
     "typescript": "npm:@typescript/typescript6@^6.0.2",
     "typescript-eslint": "^8.61.1",
diff --git a/frontend/stylelint.config.mjs b/frontend/stylelint.config.mjs
new file mode 100644
index 0000000000..2781e78516
--- /dev/null
+++ b/frontend/stylelint.config.mjs
@@ -0,0 +1,13 @@
+// Deliberately minimal: Prettier owns formatting and `task frontend:lint:colors`
+// owns the theme tokens, so this only carries rules that catch real bugs.
+export default {
+  ignoreFiles: [
+    "**/dist/**",
+    "**/src-tauri/**",
+    // Vendored third-party CSS (its first-party customisation file IS linted).
+    "**/editor/public/css/cookieconsent.css",
+  ],
+  rules: {
+    "no-duplicate-selectors": true,
+  },
+};