feat: add validated appearance palettes

docs/THEMING.md

@@ -4,6 +4,9 @@ GovOPlaN supports `system`, `light`, and `dark` as persisted user preferences.
 `system` follows `prefers-color-scheme` live; it is not resolved permanently at
 save time. Core applies the resolved mode through `data-theme` on the document
 root and exposes the selected preference through `data-theme-preference`.
+Each user may also choose a validated `default`, `civic_blue`, `forest`, or
+`plum` accent palette. Core applies it through `data-palette`; every module
+inherits the result through semantic tokens without module-specific CSS.
 
 ## Ownership
 
@@ -12,17 +15,28 @@ root and exposes the selected preference through `data-theme-preference`.
 - Modules consume semantic tokens such as `--surface`, `--text`, `--line`, and
   the status token families. They may define domain aliases whose values resolve
   to shared tokens.
-- User preference selects the mode. Tenant and system policy may provide a
-  future default, but must not silently replace an explicit user choice.
+- User preference selects the mode and palette. Invalid stored palette values
+  fail safely to `default`; the profile API accepts only the supported preset
+  identifiers. Tenant and system policy may provide a future default, but must
+  not silently replace an explicit user choice.
 - Tenant branding is a separate policy surface and must preserve contrast and
   status semantics in both modes.
 
+## Palette safety and scope
+
+The current slice is intentionally user-level. The Settings preview shows the
+chosen accent in every applicable light/dark preview before Save, and Reset
+palette returns the draft to the GovOPlaN default before persistence. Presets
+are checked for WCAG AA contrast in the theme contract. Arbitrary token
+overrides, tenant/system defaults, branding import/export, and policy locks are
+not inferred from this preference and require their own governed follow-up.
+
 Do not introduce fixed foreground/background colors in a module merely to make
 one mode look correct. Add or reuse a semantic Core token, then define both
 light and dark values. Bitmap content and externally authored HTML are exempt,
 but their surrounding controls must still use the shared tokens.
 
-`npm run test:theme-contract` verifies the root behavior and representative
+`npm run test:theme-contract` verifies root mode/palette behavior, preset
+contrast, and representative
 Campaign, Calendar, Files, and Mail token consumption. The check runs before a
 production WebUI build.
-

docs/UI_UX_DECISION_LEDGER.md

@@ -165,13 +165,17 @@ Decision: the WebUI shell exposes a small, stable appearance contract based on
 shared CSS tokens and persisted user preference selection.
 
 - Core applies `system`, `light`, and `dark` preferences at the document root.
+- Core applies validated user accent presets through `data-palette`; palette
+  values change semantic tokens globally and never require module CSS changes.
 - Core owns shared tokens such as `--bg`, `--bar`, `--panel`, `--surface`,
   `--line`, `--line-dark`, `--text`, `--text-strong`, `--muted`, semantic
   status colors, radii, shadows, and disabled-control colors.
 - Modules must style new UI with these tokens and shared controls. Module-local
   CSS may tune layout and spacing, but it must not introduce a separate
   appearance system.
-- Appearance controls live in user settings first. Tenant defaults and policy
+- Appearance controls live in user settings first. The user preference wins
+  over future tenant and system defaults unless a separately documented policy
+  lock is introduced. Tenant defaults and policy
   enforcement can be added later without changing the token contract.
 - Visual preview in settings is illustrative; it must reflect token families,
   not become a second theme implementation.

src/govoplan_core/api/v1/schemas.py

@@ -110,6 +110,7 @@ class UserUiPreferences(BaseModel):
     reduce_motion: bool = False
     sticky_section_sidebars: bool = True
     theme: Literal["system", "light", "dark"] = "system"
+    palette: Literal["default", "civic_blue", "forest", "plum"] = "default"
     navigation: NavigationPreferencesPayload | None = None
 
 

tests/test_api_smoke.py

@@ -6464,6 +6464,7 @@ class ApiSmokeTests(unittest.TestCase):
                     "reduce_motion": True,
                     "sticky_section_sidebars": False,
                     "theme": "dark",
+                    "palette": "civic_blue",
                     "navigation": {
                         "contract_version": "1",
                         "order": ["files.navigation.files", "mail.navigation.mail"],
@@ -6483,6 +6484,7 @@ class ApiSmokeTests(unittest.TestCase):
                 "reduce_motion": True,
                 "sticky_section_sidebars": False,
                 "theme": "dark",
+                "palette": "civic_blue",
                 "navigation": {
                     "contract_version": "1",
                     "order": ["files.navigation.files", "mail.navigation.mail"],
@@ -6507,11 +6509,21 @@ class ApiSmokeTests(unittest.TestCase):
             },
         )
         self.assertEqual(rejected_lock.status_code, 422, rejected_lock.text)
+        rejected_palette = self.client.patch(
+            "/api/v1/auth/profile",
+            headers=headers,
+            json={"ui_preferences": {"palette": "low_contrast_custom"}},
+        )
+        self.assertEqual(rejected_palette.status_code, 422, rejected_palette.text)
         refreshed = self.client.get("/api/v1/auth/me", headers=headers)
         self.assertEqual(refreshed.status_code, 200, refreshed.text)
         self.assertEqual(refreshed.json()["user"]["display_name"], "Global Account Name")
         self.assertEqual(refreshed.json()["user"]["tenant_display_name"], "Tenant Alias")
         self.assertEqual(refreshed.json()["user"]["ui_preferences"]["theme"], "dark")
+        self.assertEqual(
+            refreshed.json()["user"]["ui_preferences"]["palette"],
+            "civic_blue",
+        )
         self.assertFalse(refreshed.json()["user"]["ui_preferences"]["show_inline_help_hints"])
 
         roles = self.client.get("/api/v1/admin/system/roles", headers=headers)

webui/scripts/test-theme-contract.mjs

@@ -12,9 +12,24 @@ assert.match(tokens, /:root\[data-theme="dark"\]/, "dark token overrides are req
 assert.match(tokens, /color-scheme:\s*dark/, "native controls must receive the dark color scheme");
 assert.match(app, /matchMedia\?\.\("\(prefers-color-scheme: dark\)"\)/, "system theme must follow OS changes");
 assert.match(app, /dataset\.themePreference/, "the selected preference must remain inspectable");
+assert.match(app, /dataset\.palette/, "the selected palette must be applied at the document root");
 for (const theme of ["system", "light", "dark"]) {
   assert.match(settings, new RegExp(`value:\\s*"${theme}"`), `Settings must expose ${theme}`);
 }
+for (const palette of ["default", "civic_blue", "forest", "plum"]) {
+  assert.match(settings, new RegExp(`value:\\s*"${palette}"`), `Settings must expose ${palette}`);
+}
+
+const paletteContrasts = [
+  { selector: "civic_blue", accent: "#245f91", foreground: "#ffffff" },
+  { selector: "forest", accent: "#276749", foreground: "#ffffff" },
+  { selector: "plum", accent: "#704b78", foreground: "#ffffff" }
+];
+for (const palette of paletteContrasts) {
+  assert.match(tokens, new RegExp(`data-palette="${palette.selector}"[\\s\\S]*?--accent:\\s*${palette.accent}`, "i"));
+  assert.ok(contrastRatio(palette.accent, palette.foreground) >= 4.5, `${palette.selector} accent contrast must meet WCAG AA`);
+}
+assert.ok(contrastRatio("#ef6b3a", "#242424") >= 4.5, "default accent badge contrast must meet WCAG AA");
 
 const representativeModules = [
   "govoplan-campaign/webui/src/styles/campaign-workspace.css",
@@ -28,3 +43,15 @@ for (const relativePath of representativeModules) {
 }
 
 console.log("Theme contract passed for core and representative module surfaces.");
+
+function contrastRatio(first, second) {
+  const left = relativeLuminance(first);
+  const right = relativeLuminance(second);
+  return (Math.max(left, right) + 0.05) / (Math.min(left, right) + 0.05);
+}
+
+function relativeLuminance(color) {
+  const channels = color.slice(1).match(/../g).map((value) => parseInt(value, 16) / 255);
+  const linear = channels.map((value) => value <= 0.04045 ? value / 12.92 : ((value + 0.055) / 1.055) ** 2.4);
+  return 0.2126 * linear[0] + 0.7152 * linear[1] + 0.0722 * linear[2];
+}

webui/src/App.tsx

@@ -3,7 +3,7 @@ import { lazy, useEffect, useMemo, useState } from "react";
 import { fetchSession, fetchShellAuth, updateProfile } from "./api/auth";
 import { fetchPlatformModules, fetchPlatformPublicModules, fetchPlatformStatus } from "./api/platform";
 import { AUTH_REQUIRED_EVENT, isApiError, loadApiSettings, saveApiSettings, type AuthRequiredEventDetail } from "./api/client";
-import type { ApiSettings, AuthInfo, AuthSessionInfo, AuthUpdate, AuthUser, EffectiveViewProjection, LoginResponse, PlatformModuleInfo, PlatformPublicModuleInfo, PlatformWebModule, UserUiPreferences, ViewsRuntimeUiCapability } from "./types";
+import type { ApiSettings, AuthInfo, AuthSessionInfo, AuthUpdate, AuthUser, EffectiveViewProjection, LoginResponse, PlatformModuleInfo, PlatformPublicModuleInfo, PlatformWebModule, UserUiPalette, UserUiPreferences, ViewsRuntimeUiCapability } from "./types";
 import AppShell from "./layout/AppShell";
 import PublicLandingPage from "./features/auth/PublicLandingPage";
 import LoginModal from "./features/auth/LoginModal";
@@ -35,7 +35,8 @@ const DEFAULT_UI_PREFERENCES: UserUiPreferences = {
   show_inline_help_hints: true,
   reduce_motion: false,
   sticky_section_sidebars: true,
-  theme: "system"
+  theme: "system",
+  palette: "default"
 };
 
 export default function App() {
@@ -389,6 +390,7 @@ export default function App() {
     root.classList.toggle("ui-hide-help-hints", !preferences.show_inline_help_hints);
     root.classList.toggle("ui-reduce-motion", preferences.reduce_motion);
     root.classList.toggle("ui-no-sticky-section-sidebars", !preferences.sticky_section_sidebars);
+    root.dataset.palette = normalizeUiPalette(preferences.palette);
 
     const systemDarkQuery = window.matchMedia?.("(prefers-color-scheme: dark)") ?? null;
     const applyTheme = () => {
@@ -413,7 +415,8 @@ export default function App() {
     auth?.user.ui_preferences?.show_inline_help_hints,
     auth?.user.ui_preferences?.reduce_motion,
     auth?.user.ui_preferences?.sticky_section_sidebars,
-    auth?.user.ui_preferences?.theme
+    auth?.user.ui_preferences?.theme,
+    auth?.user.ui_preferences?.palette
   ]);
 
   useEffect(() => {
@@ -716,10 +719,17 @@ function normalizeUiPreferences(value: Partial<UserUiPreferences> | null | undef
     show_inline_help_hints: Boolean(value?.show_inline_help_hints ?? DEFAULT_UI_PREFERENCES.show_inline_help_hints),
     reduce_motion: Boolean(value?.reduce_motion ?? DEFAULT_UI_PREFERENCES.reduce_motion),
     sticky_section_sidebars: Boolean(value?.sticky_section_sidebars ?? DEFAULT_UI_PREFERENCES.sticky_section_sidebars),
-    theme
+    theme,
+    palette: normalizeUiPalette(value?.palette)
   };
 }
 
+function normalizeUiPalette(value: UserUiPalette | string | null | undefined): UserUiPalette {
+  return value === "civic_blue" || value === "forest" || value === "plum"
+    ? value
+    : "default";
+}
+
 function mergeWebModules(localModules: PlatformWebModule[], remoteModules: PlatformWebModule[]): PlatformWebModule[] {
   if (remoteModules.length === 0) return localModules;
   const seen = new Set(localModules.map((module) => module.id));

webui/src/features/settings/SettingsPage.tsx

@@ -2,7 +2,7 @@ import DescriptionList from "../../components/DescriptionList";
 import ContentGrid, { FormGrid } from "../../components/ContentGrid";
 import { useEffect, useMemo, useState } from "react";
 import { useSearchParams } from "react-router";
-import type { ApiSettings, AuthInfo, AuthUpdate, FilesConnectorsUiCapability, MailProfilesUiCapability, NavigationPreferences, SettingsSectionContribution, SettingsSectionsUiCapability, UserUiPreferences, UserUiTheme } from "../../types";
+import type { ApiSettings, AuthInfo, AuthUpdate, FilesConnectorsUiCapability, MailProfilesUiCapability, NavigationPreferences, SettingsSectionContribution, SettingsSectionsUiCapability, UserUiPalette, UserUiPreferences, UserUiTheme } from "../../types";
 import Card from "../../components/Card";
 import FormField from "../../components/FormField";
 import PasswordField from "../../components/PasswordField";
@@ -35,7 +35,8 @@ const DEFAULT_UI_PREFERENCES: UserUiPreferences = {
   show_inline_help_hints: true,
   reduce_motion: false,
   sticky_section_sidebars: true,
-  theme: "system"
+  theme: "system",
+  palette: "default"
 };
 
 const UI_THEME_OPTIONS: Array<{ value: UserUiTheme; label: string }> = [
@@ -44,6 +45,13 @@ const UI_THEME_OPTIONS: Array<{ value: UserUiTheme; label: string }> = [
   { value: "dark", label: "i18n:govoplan-core.dark_theme.164a90d9" }
 ];
 
+const UI_PALETTE_OPTIONS: Array<{ value: UserUiPalette; label: string }> = [
+  { value: "default", label: "i18n:govoplan-core.palette_default" },
+  { value: "civic_blue", label: "i18n:govoplan-core.palette_civic_blue" },
+  { value: "forest", label: "i18n:govoplan-core.palette_forest" },
+  { value: "plum", label: "i18n:govoplan-core.palette_plum" }
+];
+
 const SETTINGS_DOCUMENTATION = {
   contextId: "core.settings",
   documentationType: "user" as const
@@ -155,6 +163,7 @@ export default function SettingsPage({
   const [reduceMotion, setReduceMotion] = useState(currentUiPreferences.reduce_motion);
   const [stickySections, setStickySections] = useState(currentUiPreferences.sticky_section_sidebars);
   const [theme, setTheme] = useState<UserUiTheme>(currentUiPreferences.theme);
+  const [palette, setPalette] = useState<UserUiPalette>(currentUiPreferences.palette);
   const [navigation, setNavigation] = useState<NavigationPreferences | null>(currentUiPreferences.navigation ?? null);
   const [uiBusy, setUiBusy] = useState(false);
   const [uiResult, setUiResult] = useState("");
@@ -171,6 +180,7 @@ export default function SettingsPage({
     reduceMotion !== currentUiPreferences.reduce_motion ||
     stickySections !== currentUiPreferences.sticky_section_sidebars ||
     theme !== currentUiPreferences.theme ||
+    palette !== currentUiPreferences.palette ||
     JSON.stringify(navigation) !== JSON.stringify(currentUiPreferences.navigation ?? null);
 
   useUnsavedDraftGuard({
@@ -225,6 +235,7 @@ export default function SettingsPage({
     setReduceMotion(currentUiPreferences.reduce_motion);
     setStickySections(currentUiPreferences.sticky_section_sidebars);
     setTheme(currentUiPreferences.theme);
+    setPalette(currentUiPreferences.palette);
     setNavigation(currentUiPreferences.navigation ?? null);
   }, [
     currentUiPreferences.compact_tables,
@@ -232,6 +243,7 @@ export default function SettingsPage({
     currentUiPreferences.reduce_motion,
     currentUiPreferences.sticky_section_sidebars,
     currentUiPreferences.theme,
+    currentUiPreferences.palette,
     currentUiPreferences.navigation
   ]);
 
@@ -271,6 +283,7 @@ export default function SettingsPage({
     setReduceMotion(currentUiPreferences.reduce_motion);
     setStickySections(currentUiPreferences.sticky_section_sidebars);
     setTheme(currentUiPreferences.theme);
+    setPalette(currentUiPreferences.palette);
     setNavigation(currentUiPreferences.navigation ?? null);
   }
 
@@ -281,6 +294,7 @@ export default function SettingsPage({
       reduce_motion: reduceMotion,
       sticky_section_sidebars: stickySections,
       theme,
+      palette,
       navigation
     };
   }
@@ -473,15 +487,36 @@ export default function SettingsPage({
                       width="fill"
                       ariaLabel="i18n:govoplan-core.theme.a797e309" />
                   </FormField>
-                  <ThemePreview theme={theme} />
+                  <FormField
+                    label="i18n:govoplan-core.color_palette"
+                    help="i18n:govoplan-core.color_palette_help"
+                  >
+                    <select
+                      value={palette}
+                      onChange={(event) => setPalette(event.target.value as UserUiPalette)}
+                    >
+                      {UI_PALETTE_OPTIONS.map((item) => (
+                        <option key={item.value} value={item.value}>{item.label}</option>
+                      ))}
+                    </select>
+                  </FormField>
+                  <div className="button-row compact-actions">
+                    <Button onClick={() => setPalette("default")} disabled={palette === "default"}>
+                      i18n:govoplan-core.reset_palette
+                    </Button>
+                  </div>
+                  <ThemePreview theme={theme} palette={palette} />
                   <DescriptionList variant="inline" density="compact">
                     <div><dt>i18n:govoplan-core.theme.a797e309</dt><dd>{themeLabel(theme)}</dd></div>
-                    <div><dt>i18n:govoplan-core.accent_color.e49578ed</dt><dd>i18n:govoplan-core.default_brand_accent.606ae693</dd></div>
+                    <div><dt>i18n:govoplan-core.accent_color.e49578ed</dt><dd>{paletteLabel(palette)}</dd></div>
+                    <div><dt>i18n:govoplan-core.accessibility</dt><dd>i18n:govoplan-core.palette_contrast_validated</dd></div>
+                    <div><dt>i18n:govoplan-core.advanced_theme_overrides</dt><dd>i18n:govoplan-core.not_configured</dd></div>
                     <div><dt>i18n:govoplan-core.language.89b86ab0</dt><dd>{languageLabel}</dd></div>
                     <div><dt>i18n:govoplan-core.enabled.df174a3f</dt><dd>{enabledLanguages.map((item) => item.code.toUpperCase()).join(", ")}</dd></div>
                     <div><dt>i18n:govoplan-core.available.7c62a142</dt><dd>{availableLanguages.map((item) => item.code.toUpperCase()).join(", ")}</dd></div>
                     <div><dt>i18n:govoplan-core.density.f9160c22</dt><dd>{compactTables ? "i18n:govoplan-core.compact_preview.3e06901d" : "i18n:govoplan-core.comfortable.2313707a"}</dd></div>
                   </DescriptionList>
+                  <p className="muted small-note">i18n:govoplan-core.advanced_theme_overrides_follow_up</p>
                 </FormGrid>
               </Card>
             </ContentGrid>
@@ -616,20 +651,31 @@ function normalizeUiPreferences(value: Partial<UserUiPreferences> | null | undef
     reduce_motion: Boolean(value?.reduce_motion ?? DEFAULT_UI_PREFERENCES.reduce_motion),
     sticky_section_sidebars: Boolean(value?.sticky_section_sidebars ?? DEFAULT_UI_PREFERENCES.sticky_section_sidebars),
     theme,
+    palette: normalizeUiPalette(value?.palette),
     navigation: value?.navigation ?? null
   };
 }
 
+function normalizeUiPalette(value: UserUiPalette | string | null | undefined): UserUiPalette {
+  return UI_PALETTE_OPTIONS.some((item) => item.value === value)
+    ? value as UserUiPalette
+    : "default";
+}
+
 function themeLabel(value: UserUiTheme): string {
   return UI_THEME_OPTIONS.find((item) => item.value === value)?.label ?? UI_THEME_OPTIONS[0].label;
 }
 
-function ThemePreview({ theme }: {theme: UserUiTheme;}) {
+function paletteLabel(value: UserUiPalette): string {
+  return UI_PALETTE_OPTIONS.find((item) => item.value === value)?.label ?? UI_PALETTE_OPTIONS[0].label;
+}
+
+function ThemePreview({ theme, palette }: {theme: UserUiTheme;palette: UserUiPalette;}) {
   const variants: UserUiTheme[] = theme === "system" ? ["light", "dark"] : [theme];
   return (
     <div className="theme-preview-list" aria-label="i18n:govoplan-core.theme.a797e309">
       {variants.map((variant) =>
-      <div key={variant} className="theme-preview" data-preview-theme={variant}>
+      <div key={variant} className="theme-preview" data-preview-theme={variant} data-preview-palette={palette}>
           <div className="theme-preview-header">
             <span>{themeLabel(variant)}</span>
             <i />

webui/src/i18n/generatedTranslations.ts

@@ -2,6 +2,18 @@ import type { PlatformTranslations } from "../types";
 
 export const generatedTranslations: PlatformTranslations = {
   "en": {
+    "i18n:govoplan-core.color_palette": "Color palette",
+    "i18n:govoplan-core.color_palette_help": "Choose a validated accent palette. It applies to every module through shared semantic tokens.",
+    "i18n:govoplan-core.palette_default": "GovOPlaN default",
+    "i18n:govoplan-core.palette_civic_blue": "Civic blue",
+    "i18n:govoplan-core.palette_forest": "Forest",
+    "i18n:govoplan-core.palette_plum": "Plum",
+    "i18n:govoplan-core.reset_palette": "Reset palette",
+    "i18n:govoplan-core.accessibility": "Accessibility",
+    "i18n:govoplan-core.palette_contrast_validated": "Validated preset contrast",
+    "i18n:govoplan-core.advanced_theme_overrides": "Advanced custom overrides",
+    "i18n:govoplan-core.not_configured": "Not configured",
+    "i18n:govoplan-core.advanced_theme_overrides_follow_up": "Arbitrary token overrides require separate tenant branding policy and accessibility safeguards.",
     "i18n:govoplan-core.standard_folder_mappings": "Standard folder mappings",
     "i18n:govoplan-core.standard_folder_mappings_help": "Map each standard mailbox role to a folder exposed by this IMAP account. Leave a field empty to use automatic detection.",
     "i18n:govoplan-core.inbox_folder": "Inbox folder",
@@ -689,6 +701,18 @@ export const generatedTranslations: PlatformTranslations = {
     "i18n:govoplan-core.temporal_selection_invalid": "The selected data state is invalid."
   },
   "de": {
+    "i18n:govoplan-core.color_palette": "Farbpalette",
+    "i18n:govoplan-core.color_palette_help": "Wählen Sie eine geprüfte Akzentpalette. Sie gilt über gemeinsame semantische Tokens für alle Module.",
+    "i18n:govoplan-core.palette_default": "GovOPlaN-Standard",
+    "i18n:govoplan-core.palette_civic_blue": "Kommunalblau",
+    "i18n:govoplan-core.palette_forest": "Waldgrün",
+    "i18n:govoplan-core.palette_plum": "Pflaume",
+    "i18n:govoplan-core.reset_palette": "Palette zurücksetzen",
+    "i18n:govoplan-core.accessibility": "Barrierefreiheit",
+    "i18n:govoplan-core.palette_contrast_validated": "Geprüfter Kontrast der Vorgabe",
+    "i18n:govoplan-core.advanced_theme_overrides": "Erweiterte benutzerdefinierte Anpassungen",
+    "i18n:govoplan-core.not_configured": "Nicht konfiguriert",
+    "i18n:govoplan-core.advanced_theme_overrides_follow_up": "Beliebige Token-Anpassungen erfordern eine getrennte Mandanten-Branding-Richtlinie und Barrierefreiheitsprüfungen.",
     "i18n:govoplan-core.standard_folder_mappings": "Zuordnung der Standardordner",
     "i18n:govoplan-core.standard_folder_mappings_help": "Ordnen Sie jede Standardfunktion einem Ordner dieses IMAP-Kontos zu. Lassen Sie ein Feld leer, um die automatische Erkennung zu verwenden.",
     "i18n:govoplan-core.inbox_folder": "Posteingang",

webui/src/styles/components.css

@@ -3231,6 +3231,7 @@
   --preview-line: var(--theme-preview-light-line);
   --preview-text: var(--theme-preview-light-text);
   --preview-muted: var(--theme-preview-light-muted);
+  --preview-accent: var(--theme-preview-accent-default);
   display: grid;
   gap: 0;
   min-height: 112px;
@@ -3240,6 +3241,10 @@
   background: var(--preview-bg);
 }
 
+.theme-preview[data-preview-palette="civic_blue"] { --preview-accent: var(--theme-preview-accent-civic-blue); }
+.theme-preview[data-preview-palette="forest"] { --preview-accent: var(--theme-preview-accent-forest); }
+.theme-preview[data-preview-palette="plum"] { --preview-accent: var(--theme-preview-accent-plum); }
+
 .theme-preview[data-preview-theme="dark"] {
   --preview-bg: var(--theme-preview-dark-bg);
   --preview-bar: var(--theme-preview-dark-bar);
@@ -3266,8 +3271,8 @@
   width: 18px;
   height: 18px;
   border-radius: var(--radius-round);
-  background: var(--accent);
-  box-shadow: 0 0 0 3px var(--accent-soft);
+  background: var(--preview-accent);
+  box-shadow: 0 0 0 3px color-mix(in srgb, var(--preview-accent) 35%, transparent);
 }
 
 .theme-preview-body {

webui/src/styles/tokens.css

@@ -242,6 +242,10 @@
   --theme-preview-dark-line: #454740;
   --theme-preview-dark-text: #f6f4ed;
   --theme-preview-dark-muted: #aaa79d;
+  --theme-preview-accent-default: #ef6b3a;
+  --theme-preview-accent-civic-blue: #245f91;
+  --theme-preview-accent-forest: #276749;
+  --theme-preview-accent-plum: #704b78;
 
   --calendar-event-bg-default: #edf8f5;
   --calendar-event-border-default: #b9d7d0;
@@ -429,6 +433,36 @@
   --campaign-panel-bg: rgba(38, 39, 36, .94);
 }
 
+:root[data-palette="civic_blue"] {
+  --accent: #245f91;
+  --accent-rgb: 36, 95, 145;
+  --accent-soft: rgba(36, 95, 145, .35);
+  --accent-hover-bg: rgba(36, 95, 145, .14);
+  --accent-auth-glow: rgba(36, 95, 145, .16);
+  --accent-ring-soft: 0 0 0 2px rgba(36, 95, 145, .20);
+  --badge-accent-text: #ffffff;
+}
+
+:root[data-palette="forest"] {
+  --accent: #276749;
+  --accent-rgb: 39, 103, 73;
+  --accent-soft: rgba(39, 103, 73, .35);
+  --accent-hover-bg: rgba(39, 103, 73, .14);
+  --accent-auth-glow: rgba(39, 103, 73, .16);
+  --accent-ring-soft: 0 0 0 2px rgba(39, 103, 73, .20);
+  --badge-accent-text: #ffffff;
+}
+
+:root[data-palette="plum"] {
+  --accent: #704b78;
+  --accent-rgb: 112, 75, 120;
+  --accent-soft: rgba(112, 75, 120, .35);
+  --accent-hover-bg: rgba(112, 75, 120, .14);
+  --accent-auth-glow: rgba(112, 75, 120, .16);
+  --accent-ring-soft: 0 0 0 2px rgba(112, 75, 120, .20);
+  --badge-accent-text: #ffffff;
+}
+
 .ui-reduce-motion *,
 .ui-reduce-motion *::before,
 .ui-reduce-motion *::after {

webui/src/types.ts

@@ -41,6 +41,7 @@ export type AuthUser = {
 };
 
 export type UserUiTheme = "system" | "light" | "dark";
+export type UserUiPalette = "default" | "civic_blue" | "forest" | "plum";
 
 export type UserUiPreferences = {
   compact_tables: boolean;
@@ -48,6 +49,7 @@ export type UserUiPreferences = {
   reduce_motion: boolean;
   sticky_section_sidebars: boolean;
   theme: UserUiTheme;
+  palette: UserUiPalette;
   navigation?: NavigationPreferences | null;
 };