diff --git a/src/lib/components/AppLayout.svelte b/src/lib/components/AppLayout.svelte
index b4cc866..b75ab7e 100644
--- a/src/lib/components/AppLayout.svelte
+++ b/src/lib/components/AppLayout.svelte
@@ -57,6 +57,7 @@
 	const isMobile = $derived($platformIsMobile);
 	const isAndroid = /android/i.test(navigator.userAgent);
 	import { loadVaultState, saveVaultState, readNote, createDailyNote, createBackup, getPendingOpenFile, addQuickAccess, removeQuickAccess, getQuickAccess, setTheme, syncNow, setTaskDone, setTaskPriority, setTaskDue } from '$lib/api';
+	import { darkThemes } from '$lib/platform';
 	import { debounce } from '$lib/utils/debounce';
 	import { openNoteWindow } from '$lib/utils/window';
 	import { get } from 'svelte/store';
@@ -475,8 +476,7 @@
 	}
 
 	function applyTheme(t: string) {
-		const darkThemes = ['dark', 'solarized-dark', 'catppuccin', 'nord', 'tokyo-night', 'github-dark', 'dracula', 'blueberry', 'forest-green', 'gruvbox', 'midnight-tide', 'cherry-blossom', 'synthwave', 'ember', 'moonlit', 'dark-coffee', 'crimson'];
-		const namedThemes = ['solarized-light', 'solarized-dark', 'catppuccin', 'nord', 'tokyo-night', 'github-light', 'github-dark', 'dracula', 'blueberry', 'forest-green', 'gruvbox', 'midnight-tide', 'cherry-blossom', 'synthwave', 'ember', 'moonlit', 'light-coffee', 'dark-coffee', 'cotton-candy', 'crimson', 'cloud', 'peach'];
+		const namedThemes = ['solarized-light', 'solarized-dark', 'catppuccin', 'nord', 'tokyo-night', 'github-light', 'github-dark', 'dracula', 'blueberry', 'forest-green', 'gruvbox', 'midnight-tide', 'cherry-blossom', 'synthwave', 'ember', 'moonlit', 'light-coffee', 'dark-coffee', 'cotton-candy', 'crimson', 'cloud', 'peach', 'material-dark', 'material-light', 'monokai', 'rose-pine', 'everforest', 'horizon', 'cyberpunk', 'black', 'one-dark'];
 		const root = document.documentElement;
 		root.classList.remove('dark');
 		root.removeAttribute('data-theme');
diff --git a/src/lib/components/CommandPalette.svelte b/src/lib/components/CommandPalette.svelte
index d38f0f5..204dee4 100644
--- a/src/lib/components/CommandPalette.svelte
+++ b/src/lib/components/CommandPalette.svelte
@@ -1,6 +1,7 @@
 <script lang="ts">
 	import { showCommandPalette, showSearch, theme, sourceMode } from '$lib/stores/app';
 	import { setTheme, reindex } from '$lib/api';
+	import { darkThemes } from '$lib/platform';
 
 	interface Command {
 		id: string;
@@ -142,8 +143,7 @@
 	}
 
 	function applyTheme(t: string) {
-		const darkThemes = ['dark', 'solarized-dark', 'catppuccin', 'nord', 'tokyo-night', 'github-dark', 'dracula', 'blueberry', 'forest-green', 'gruvbox', 'midnight-tide', 'cherry-blossom', 'synthwave', 'ember', 'moonlit', 'dark-coffee', 'crimson'];
-		const namedThemes = ['solarized-light', 'solarized-dark', 'catppuccin', 'nord', 'tokyo-night', 'github-light', 'github-dark', 'dracula', 'blueberry', 'forest-green', 'gruvbox', 'midnight-tide', 'cherry-blossom', 'synthwave', 'ember', 'moonlit', 'light-coffee', 'dark-coffee', 'cotton-candy', 'crimson', 'cloud', 'peach'];
+		const namedThemes = ['solarized-light', 'solarized-dark', 'catppuccin', 'nord', 'tokyo-night', 'github-light', 'github-dark', 'dracula', 'blueberry', 'forest-green', 'gruvbox', 'midnight-tide', 'cherry-blossom', 'synthwave', 'ember', 'moonlit', 'light-coffee', 'dark-coffee', 'cotton-candy', 'crimson', 'cloud', 'peach', 'material-dark', 'material-light', 'monokai', 'rose-pine', 'everforest', 'horizon', 'cyberpunk', 'black', 'one-dark'];
 		const root = document.documentElement;
 		root.classList.remove('dark');
 		root.removeAttribute('data-theme');
diff --git a/src/lib/components/NoteWindow.svelte b/src/lib/components/NoteWindow.svelte
index db5d05c..d4de6d3 100644
--- a/src/lib/components/NoteWindow.svelte
+++ b/src/lib/components/NoteWindow.svelte
@@ -16,6 +16,8 @@
 
 	let { notePath }: { notePath: string } = $props();
 
+	import { darkThemes } from '$lib/platform';
+
 	const appWindow = getCurrentWindow();
 	const isMac = navigator.platform.startsWith('Mac');
 	let editor = $state<Editor>(null!);
@@ -35,8 +37,7 @@
 
 	$effect(() => {
 		const t = $theme || 'system';
-		const darkThemes = ['dark', 'solarized-dark', 'catppuccin', 'nord', 'tokyo-night', 'github-dark', 'dracula', 'blueberry', 'forest-green', 'gruvbox', 'midnight-tide', 'cherry-blossom', 'synthwave', 'ember', 'moonlit', 'dark-coffee', 'crimson'];
-		const namedThemes = ['solarized-light', 'solarized-dark', 'catppuccin', 'nord', 'tokyo-night', 'github-light', 'github-dark', 'dracula', 'blueberry', 'forest-green', 'gruvbox', 'midnight-tide', 'cherry-blossom', 'synthwave', 'ember', 'moonlit', 'light-coffee', 'dark-coffee', 'cotton-candy', 'crimson', 'cloud', 'peach'];
+		const namedThemes = ['solarized-light', 'solarized-dark', 'catppuccin', 'nord', 'tokyo-night', 'github-light', 'github-dark', 'dracula', 'blueberry', 'forest-green', 'gruvbox', 'midnight-tide', 'cherry-blossom', 'synthwave', 'ember', 'moonlit', 'light-coffee', 'dark-coffee', 'cotton-candy', 'crimson', 'cloud', 'peach', 'material-dark', 'material-light', 'monokai', 'rose-pine', 'everforest', 'horizon', 'cyberpunk', 'black', 'one-dark'];
 		const root = document.documentElement;
 		root.classList.remove('dark');
 		root.removeAttribute('data-theme');
diff --git a/src/lib/components/SettingsPanel.svelte b/src/lib/components/SettingsPanel.svelte
index 8e20ccd..fdfab38 100644
--- a/src/lib/components/SettingsPanel.svelte
+++ b/src/lib/components/SettingsPanel.svelte
@@ -1,6 +1,7 @@
 <script lang="ts">
 	import { showSettings, theme, appConfig, updateAvailable as globalUpdateAvailable, updateObj as globalUpdateObj, installType, settingsTab, vaultReady, androidApkUrl, checkForUpdateMobile, notebookSortMode, isManagedInstall } from '$lib/stores/app';
 	import { setTheme, setAccentColor, setFontSize, setFontFamily, setLineHeight, setUiScale, setGeneralSettings, importObsidian, createBackup, listBackups, restoreBackup, deleteBackup, setBackupSettings, setAiSettings, testAiConnection, setSyncSettings, testSyncConnection, syncNow } from '$lib/api';
+	import { darkThemes } from '$lib/platform';
 	import { open as openDialog } from '@tauri-apps/plugin-dialog';
 	import { listen } from '@tauri-apps/api/event';
 	import { getVersion } from '@tauri-apps/api/app';
@@ -384,7 +385,6 @@
 		}
 	}
 
-	const darkThemes = ['dark', 'solarized-dark', 'catppuccin', 'nord', 'tokyo-night', 'github-dark', 'dracula', 'blueberry', 'forest-green', 'gruvbox', 'midnight-tide', 'cherry-blossom', 'synthwave', 'ember', 'moonlit', 'dark-coffee', 'crimson', 'material-dark', 'monokai', 'rose-pine', 'everforest', 'horizon', 'cyberpunk', 'black', 'one-dark'];
 	let isThemeDark = $derived(
 		darkThemes.includes($theme) || ($theme === 'system' && window.matchMedia('(prefers-color-scheme: dark)').matches)
 	);
diff --git a/src/lib/platform.ts b/src/lib/platform.ts
index b816ff2..6a9d96a 100644
--- a/src/lib/platform.ts
+++ b/src/lib/platform.ts
@@ -5,3 +5,37 @@ const ua = typeof navigator !== 'undefined' ? navigator.userAgent : '';
 export const isAndroid = /android/i.test(ua);
 export const isIOS = /iphone|ipad|ipod/i.test(ua);
 export const isMobile = isAndroid || isIOS;
+
+// Themes that use the dark color scheme. Used by applyTheme() to toggle the
+// `dark` class on the root element. Keep this in sync when adding new themes.
+export const darkThemes = [
+	'dark',
+	'solarized-dark',
+	'catppuccin',
+	'nord',
+	'tokyo-night',
+	'github-dark',
+	'dracula',
+	'blueberry',
+	'forest-green',
+	'gruvbox',
+	'midnight-tide',
+	'cherry-blossom',
+	'synthwave',
+	'ember',
+	'moonlit',
+	'dark-coffee',
+	'crimson',
+	'material-dark',
+	'monokai',
+	'rose-pine',
+	'everforest',
+	'horizon',
+	'cyberpunk',
+	'black',
+	'one-dark',
+];
+
+export function isDarkTheme(theme: string): boolean {
+	return darkThemes.includes(theme) || (theme === 'system' && typeof window !== 'undefined' && window.matchMedia('(prefers-color-scheme: dark)').matches);
+}
diff --git a/src/routes/+layout.svelte b/src/routes/+layout.svelte
index c5beec3..b39b29a 100644
--- a/src/routes/+layout.svelte
+++ b/src/routes/+layout.svelte
@@ -4,6 +4,7 @@
 	import { theme, appConfig, activeNote, activeNotePath, installType, platformIsMobile, checkForUpdate, checkForUpdateMobile, isManagedInstall } from '$lib/stores/app';
 	import { openFile, openUrl, readNote, getInstallType, isMobilePlatform } from '$lib/api';
 	import { get } from 'svelte/store';
+	import { darkThemes } from '$lib/platform';
 	import ResizeHandles from '$lib/components/ResizeHandles.svelte';
 
 	let { children } = $props();
@@ -16,7 +17,6 @@
 	});
 
 	function applyTheme(t: string) {
-		const darkThemes = ['dark', 'solarized-dark', 'catppuccin', 'nord', 'tokyo-night', 'github-dark', 'dracula', 'blueberry', 'forest-green', 'gruvbox', 'midnight-tide', 'cherry-blossom', 'synthwave', 'ember', 'moonlit', 'dark-coffee', 'crimson', 'material-dark', 'monokai', 'rose-pine', 'everforest', 'horizon', 'cyberpunk', 'black', 'one-dark'];
 		const namedThemes = ['solarized-light', 'solarized-dark', 'catppuccin', 'nord', 'tokyo-night', 'github-light', 'github-dark', 'dracula', 'blueberry', 'forest-green', 'gruvbox', 'midnight-tide', 'cherry-blossom', 'synthwave', 'ember', 'moonlit', 'light-coffee', 'dark-coffee', 'cotton-candy', 'crimson', 'cloud', 'peach', 'material-dark', 'material-light', 'monokai', 'rose-pine', 'everforest', 'horizon', 'cyberpunk', 'black', 'one-dark'];
 		const root = document.documentElement;
 		root.classList.remove('dark');
diff --git a/src/routes/+page.svelte b/src/routes/+page.svelte
index 69e2b13..97872c7 100644
--- a/src/routes/+page.svelte
+++ b/src/routes/+page.svelte
@@ -2,6 +2,7 @@
 	import { onDestroy, onMount } from 'svelte';
 	import { appConfig, vaultReady, theme } from '$lib/stores/app';
 	import { getAppConfig, openVault, setFontSize } from '$lib/api';
+	import { darkThemes } from '$lib/platform';
 	import { getCurrentWebview } from '@tauri-apps/api/webview';
 	import VaultPicker from '$lib/components/VaultPicker.svelte';
 	import AppLayout from '$lib/components/AppLayout.svelte';
@@ -120,8 +121,7 @@
 			// Apply theme immediately to prevent flash
 			const themeValue = config.theme || 'system';
 			const root = document.documentElement;
-			const darkThemes = ['dark', 'solarized-dark', 'catppuccin', 'nord', 'tokyo-night', 'github-dark', 'dracula', 'blueberry', 'forest-green', 'gruvbox', 'midnight-tide', 'cherry-blossom', 'synthwave', 'ember', 'moonlit', 'dark-coffee', 'crimson'];
-			const namedThemes = ['solarized-light', 'solarized-dark', 'catppuccin', 'nord', 'tokyo-night', 'github-light', 'github-dark', 'dracula', 'blueberry', 'forest-green', 'gruvbox', 'midnight-tide', 'cherry-blossom', 'synthwave', 'ember', 'moonlit', 'light-coffee', 'dark-coffee', 'cotton-candy', 'crimson', 'cloud', 'peach'];
+			const namedThemes = ['solarized-light', 'solarized-dark', 'catppuccin', 'nord', 'tokyo-night', 'github-light', 'github-dark', 'dracula', 'blueberry', 'forest-green', 'gruvbox', 'midnight-tide', 'cherry-blossom', 'synthwave', 'ember', 'moonlit', 'light-coffee', 'dark-coffee', 'cotton-candy', 'crimson', 'cloud', 'peach', 'material-dark', 'material-light', 'monokai', 'rose-pine', 'everforest', 'horizon', 'cyberpunk', 'black', 'one-dark'];
 			root.classList.remove('dark');
 			root.removeAttribute('data-theme');
 			if (namedThemes.includes(themeValue)) {