diff --git a/web/src/app.html b/web/src/app.html
index 6a2bb58..2571249 100644
--- a/web/src/app.html
+++ b/web/src/app.html
@@ -1,9 +1,21 @@
 <!doctype html>
-<html lang="en">
+<html lang="ru">
 	<head>
 		<meta charset="utf-8" />
 		<meta name="viewport" content="width=device-width, initial-scale=1" />
 		<meta name="text-scale" content="scale" />
+		<script>
+			(function () {
+				try {
+					var k = 'evobgp-theme';
+					var t = localStorage.getItem(k);
+					var dark =
+						t === 'dark' ||
+						(t !== 'light' && window.matchMedia('(prefers-color-scheme: dark)').matches);
+					if (dark) document.documentElement.classList.add('dark');
+				} catch (e) {}
+			})();
+		</script>
 		%sveltekit.head%
 	</head>
 	<body data-sveltekit-preload-data="hover">
diff --git a/web/src/lib/AppShell.svelte b/web/src/lib/AppShell.svelte
index 9115c8f..f826e85 100644
--- a/web/src/lib/AppShell.svelte
+++ b/web/src/lib/AppShell.svelte
@@ -2,9 +2,19 @@
 	import { resolve } from '$app/paths';
 	import { page } from '$app/state';
 	import { cn } from '$lib/utils.js';
+	import { Button } from '$lib/components/ui/button/index.js';
 	import { buttonVariants } from '$lib/components/ui/button/button.svelte';
+	import {
+		DropdownMenu,
+		DropdownMenuContent,
+		DropdownMenuLabel,
+		DropdownMenuRadioGroup,
+		DropdownMenuRadioItem,
+		DropdownMenuTrigger
+	} from '$lib/components/ui/dropdown-menu/index.js';
 	import { Separator } from '$lib/components/ui/separator/index.js';
 	import { Tooltip, TooltipContent, TooltipProvider, TooltipTrigger } from '$lib/components/ui/tooltip/index.js';
+	import type { ThemePreference } from '$lib/theme.js';
 
 	import Activity from '@lucide/svelte/icons/activity';
 	import Boxes from '@lucide/svelte/icons/boxes';
@@ -17,6 +27,9 @@
 	import CalendarClock from '@lucide/svelte/icons/calendar-clock';
 	import PanelLeftClose from '@lucide/svelte/icons/panel-left-close';
 	import PanelLeftOpen from '@lucide/svelte/icons/panel-left-open';
+	import Sun from '@lucide/svelte/icons/sun';
+	import Moon from '@lucide/svelte/icons/moon';
+	import Monitor from '@lucide/svelte/icons/monitor';
 
 	const nav = [
 		{ href: '/', label: 'Обзор', icon: LayoutDashboard },
@@ -34,7 +47,7 @@
 	] as const;
 
 	let collapsed = $state(false);
-	let { children } = $props();
+	let { children, theme = $bindable<ThemePreference>('system') } = $props();
 
 	function isActive(href: string) {
 		const pathname = page.url.pathname;
@@ -60,6 +73,37 @@
 					<p class="text-sidebar-foreground/50 truncate text-xs">Control plane</p>
 				</div>
 			{/if}
+			<DropdownMenu>
+				<DropdownMenuTrigger
+					class={cn(
+						buttonVariants({ variant: 'ghost', size: 'icon-sm' }),
+						'text-sidebar-foreground/60 hover:text-sidebar-foreground shrink-0'
+					)}
+					aria-label="Тема оформления"
+				>
+					<span class="flex size-4 items-center justify-center">
+						<Sun class="size-4 dark:hidden" />
+						<Moon class="hidden size-4 dark:block" />
+					</span>
+				</DropdownMenuTrigger>
+				<DropdownMenuContent align="end" class="w-44">
+					<DropdownMenuLabel>Тема</DropdownMenuLabel>
+					<DropdownMenuRadioGroup bind:value={theme}>
+						<DropdownMenuRadioItem value="light" class="gap-2">
+							<Sun class="size-4" />
+							Светлая
+						</DropdownMenuRadioItem>
+						<DropdownMenuRadioItem value="dark" class="gap-2">
+							<Moon class="size-4" />
+							Тёмная
+						</DropdownMenuRadioItem>
+						<DropdownMenuRadioItem value="system" class="gap-2">
+							<Monitor class="size-4" />
+							Как в системе
+						</DropdownMenuRadioItem>
+					</DropdownMenuRadioGroup>
+				</DropdownMenuContent>
+			</DropdownMenu>
 			<button
 				onclick={() => (collapsed = !collapsed)}
 				class={cn(
diff --git a/web/src/lib/theme.ts b/web/src/lib/theme.ts
new file mode 100644
index 0000000..61db903
--- /dev/null
+++ b/web/src/lib/theme.ts
@@ -0,0 +1,25 @@
+import { browser } from '$app/environment';
+
+export const THEME_STORAGE_KEY = 'evobgp-theme';
+
+export type ThemePreference = 'light' | 'dark' | 'system';
+
+export function readTheme(): ThemePreference {
+	if (!browser) return 'system';
+	try {
+		const s = localStorage.getItem(THEME_STORAGE_KEY);
+		if (s === 'light' || s === 'dark' || s === 'system') return s;
+	} catch {
+		/* ignore */
+	}
+	return 'system';
+}
+
+/** Синхронизирует класс `dark` на `document.documentElement` с выбранным режимом. */
+export function applyTheme(mode: ThemePreference): void {
+	if (!browser) return;
+	const dark =
+		mode === 'dark' ||
+		(mode === 'system' && window.matchMedia('(prefers-color-scheme: dark)').matches);
+	document.documentElement.classList.toggle('dark', dark);
+}
diff --git a/web/src/routes/+layout.svelte b/web/src/routes/+layout.svelte
index 2c1e9bd..5362d4d 100644
--- a/web/src/routes/+layout.svelte
+++ b/web/src/routes/+layout.svelte
@@ -1,15 +1,45 @@
 <script lang="ts">
+	import { browser } from '$app/environment';
+	import { onMount } from 'svelte';
 	import './layout.css';
 	import favicon from '$lib/assets/favicon.svg';
 	import AppShell from '$lib/AppShell.svelte';
+	import { applyTheme, readTheme, THEME_STORAGE_KEY, type ThemePreference } from '$lib/theme.js';
 	import { Toaster } from 'svelte-sonner';
 
 	let { children } = $props();
+
+	let themePref = $state<ThemePreference>('system');
+
+	onMount(() => {
+		themePref = readTheme();
+		applyTheme(themePref);
+		const mq = window.matchMedia('(prefers-color-scheme: dark)');
+		const onOs = () => {
+			if (themePref === 'system') applyTheme('system');
+		};
+		mq.addEventListener('change', onOs);
+		return () => mq.removeEventListener('change', onOs);
+	});
+
+	$effect(() => {
+		if (!browser) return;
+		applyTheme(themePref);
+		try {
+			localStorage.setItem(THEME_STORAGE_KEY, themePref);
+		} catch {
+			/* ignore */
+		}
+	});
+
+	const sonnerTheme = $derived(
+		themePref === 'system' ? 'system' : themePref === 'dark' ? 'dark' : 'light'
+	);
 </script>
 
 <svelte:head>
 	<link rel="icon" href={favicon} />
 	<title>EvoBGP</title>
 </svelte:head>
-<Toaster richColors position="top-right" />
-<AppShell>{@render children()}</AppShell>
+<Toaster richColors theme={sonnerTheme} position="top-right" />
+<AppShell bind:theme={themePref}>{@render children()}</AppShell>
diff --git a/web/src/routes/modules/+page.svelte b/web/src/routes/modules/+page.svelte
index e8e2167..f8107db 100644
--- a/web/src/routes/modules/+page.svelte
+++ b/web/src/routes/modules/+page.svelte
@@ -202,9 +202,23 @@
 					<Input id="m-interval" type="number" placeholder="3600" bind:value={form.refresh_interval_sec} />
 				</div>
 			</div>
-			<div class="flex items-center gap-3">
-				<Switch id="m-enabled" bind:checked={form.enabled} />
-				<Label for="m-enabled">Включён</Label>
+			<div
+				class="border-border bg-muted/30 flex flex-row items-center justify-between gap-4 rounded-lg border p-3"
+			>
+				<div class="grid min-w-0 flex-1 gap-1 pr-2">
+					<Label for="m-enabled" class="text-foreground leading-snug">Включён</Label>
+					<p class="text-muted-foreground text-xs leading-snug">
+						Модуль участвует в сборке ревизий, если включён.
+					</p>
+				</div>
+				<Switch
+					id="m-enabled"
+					class="shrink-0"
+					checked={form.enabled !== false}
+					onCheckedChange={(v) => {
+						form = { ...form, enabled: v };
+					}}
+				/>
 			</div>
 		</div>
 		<DialogFooter>
diff --git a/web/src/routes/modules/[moduleId]/+page.svelte b/web/src/routes/modules/[moduleId]/+page.svelte
index 5dd34b6..bc52686 100644
--- a/web/src/routes/modules/[moduleId]/+page.svelte
+++ b/web/src/routes/modules/[moduleId]/+page.svelte
@@ -689,9 +689,23 @@
 					</SelectContent>
 				</Select>
 			</div>
-			<div class="flex items-center gap-3">
-				<Switch id="e-enabled" bind:checked={editForm.enabled} />
-				<Label for="e-enabled">Включён</Label>
+			<div
+				class="border-border bg-muted/30 flex flex-row items-center justify-between gap-4 rounded-lg border p-3"
+			>
+				<div class="grid min-w-0 flex-1 gap-1 pr-2">
+					<Label for="e-enabled" class="text-foreground leading-snug">Включён</Label>
+					<p class="text-muted-foreground text-xs leading-snug">
+						Отключённые модули не участвуют в обновлении конфигурации.
+					</p>
+				</div>
+				<Switch
+					id="e-enabled"
+					class="shrink-0"
+					checked={editForm.enabled !== false}
+					onCheckedChange={(v) => {
+						editForm = { ...editForm, enabled: v };
+					}}
+				/>
 			</div>
 		</div>
 		<DialogFooter>
