diff --git a/docs/plan-redesign.md b/docs/plan-redesign.md
index 240cfb0..90a139c 100644
--- a/docs/plan-redesign.md
+++ b/docs/plan-redesign.md
@@ -329,7 +329,7 @@ src/routes/preview/tools/[id]/+page.svelte
 - [x] **[C10]** `/preview/list-tools` — каталог карточек (группировка по
       `CATEGORIES`, `ToolCard`). Ссылки пока `#` (реальные `/preview/tools/[id]`
       подключим на C12).
-- [ ] **[C11]** `/preview/demo` — зеркало воркспейса (приёмочный стенд).
+- [x] **[C11]** `/preview/demo` — зеркало воркспейса (4 шага + панель превью), статичный приёмочный стенд.
 - [ ] **[C12]** `/preview/tools/[id]` — раскладка gradient (settings-panel + preview-panel).
 - [ ] **[C13]** `/preview/tools/[id]` — раскладка background-remover (comparison-grid).
 - [ ] **[C14]** step-cards для chain в tool-page.
diff --git a/web/src/routes/preview/demo/+page.svelte b/web/src/routes/preview/demo/+page.svelte
new file mode 100644
index 0000000..149427d
--- /dev/null
+++ b/web/src/routes/preview/demo/+page.svelte
@@ -0,0 +1,588 @@
+<script lang="ts">
+	import {
+		CircleHelp,
+		Moon,
+		Upload,
+		Settings2,
+		RotateCcw,
+		ChevronDown,
+	} from "@lucide/svelte";
+	import StepCard from "$lib/components/kit/StepCard.svelte";
+	import Segmented from "$lib/components/kit/Segmented.svelte";
+	import SliderField from "$lib/components/kit/SliderField.svelte";
+	import ColorField from "$lib/components/kit/ColorField.svelte";
+	import Toggle from "$lib/components/kit/Toggle.svelte";
+	import IconButton from "$lib/components/kit/IconButton.svelte";
+	import DownloadButton from "$lib/components/kit/DownloadButton.svelte";
+	import Badge from "$lib/components/kit/Badge.svelte";
+	import StatusDot from "$lib/components/kit/StatusDot.svelte";
+	import MonoLabel from "$lib/components/kit/MonoLabel.svelte";
+	import MetaList from "$lib/components/kit/MetaList.svelte";
+	import PreviewTile from "$lib/components/kit/PreviewTile.svelte";
+	import CheckerCanvas from "$lib/components/kit/CheckerCanvas.svelte";
+
+	let gradColor = $state("#DCEBFF");
+	let direction = $state(135);
+	let opacity = $state("100");
+	let outlineWidth = $state(2);
+	let outlineColor = $state("#16202B");
+	let radius = $state(18);
+	let preserveAspect = $state(true);
+	let lang = $state("RU");
+
+	const previewTiles = [
+		{ label: "SOURCE", caption: "original.png · 1200 × 800", bg: "#8d9aa5" },
+		{
+			label: "STEP 01",
+			caption: "gradient applied",
+			bg: "linear-gradient(135deg, #DCEBFF, #8BC8F5)",
+		},
+		{
+			label: "STEP 02",
+			caption: "background removed",
+			bg: "linear-gradient(135deg, #DCEBFF, #8BC8F5)",
+		},
+		{
+			label: "STEP 03",
+			caption: "outline added",
+			bg: "linear-gradient(135deg, #DCEBFF, #8BC8F5)",
+			ring: "0 0 0 2px #16202B",
+		},
+		{
+			label: "FINAL OUTPUT",
+			caption: "ready · PNG-24",
+			bg: "linear-gradient(135deg, #DCEBFF, #8BC8F5)",
+			radius: "18px",
+			ring: "0 0 0 2px #16202B",
+			active: true,
+		},
+	];
+</script>
+
+<svelte:head>
+	<title>easy-png-tools / Demo</title>
+	<meta name="robots" content="noindex, nofollow" />
+</svelte:head>
+
+<div class="topbar">
+	<div class="brand">
+		<span class="brand-mark">EP</span>
+		<span>easy-png-tools</span>
+		<span class="version">/ DEMO</span>
+	</div>
+	<div class="top-actions">
+		<span class="status"><StatusDot /> AUTO PIPELINE</span>
+		<IconButton icon={CircleHelp} label="Help" onclick={() => {}} />
+		<IconButton icon={Moon} label="Toggle theme" onclick={() => {}} />
+		<div class="language">
+			<Segmented
+				bind:value={lang}
+				options={[
+					{ value: "RU", label: "RU" },
+					{ value: "EN", label: "EN" },
+				]}
+			/>
+		</div>
+	</div>
+</div>
+
+<div class="page-grid">
+	<section class="workspace">
+		<div class="eyebrow">PNG PROCESSING <span>/</span> WORKSPACE</div>
+		<div class="title-row">
+			<div>
+				<h1>Build your image pipeline.</h1>
+				<p class="lede">
+					Chain simple tools together. Every change is processed automatically
+					and previewed at each stage.
+				</p>
+			</div>
+			<div class="file-chip">
+				<Upload size={15} />
+				<span>source.png</span>
+				<b>1.8 MB</b>
+			</div>
+		</div>
+
+		<div class="pipeline-head">
+			<div>
+				<span class="label">PROCESSING PIPELINE</span>
+				<strong>4 active steps <em>• LIVE</em></strong>
+			</div>
+			<button class="add-btn" onclick={() => {}}>+ Add tool</button>
+		</div>
+
+		<div class="steps-list">
+			<StepCard
+				index={1}
+				type="BACKGROUND"
+				title="Gradient background"
+				onremove={() => {}}
+			>
+				<div class="step-tools"><Badge tone="success">AUTO</Badge></div>
+				<div class="controls">
+					<div class="control-block">
+						<MonoLabel>COLOR</MonoLabel>
+						<ColorField label="Gradient color" bind:value={gradColor} />
+					</div>
+					<SliderField
+						label="DIRECTION"
+						bind:value={direction}
+						min={0}
+						max={360}
+						suffix="°"
+					/>
+					<div class="control-block">
+						<MonoLabel>OPACITY</MonoLabel>
+						<Segmented
+							bind:value={opacity}
+							options={[
+								{ value: "100", label: "100" },
+								{ value: "75", label: "75" },
+								{ value: "50", label: "50" },
+								{ value: "25", label: "25" },
+							]}
+						/>
+					</div>
+				</div>
+			</StepCard>
+
+			<StepCard
+				index={2}
+				type="TRANSFORM"
+				title="Remove background"
+				onremove={() => {}}
+			>
+				<div class="step-tools"><Badge tone="success">AUTO</Badge></div>
+				<div class="transform-note">Automatic subject detection enabled</div>
+			</StepCard>
+
+			<StepCard index={3} type="STYLE" title="Add outline" onremove={() => {}}>
+				<div class="step-tools"><Badge tone="success">AUTO</Badge></div>
+				<div class="controls compact">
+					<div class="control-block">
+						<MonoLabel>WIDTH</MonoLabel>
+						<SliderField
+							label="Outline width"
+							bind:value={outlineWidth}
+							min={0}
+							max={8}
+							suffix="px"
+						/>
+					</div>
+					<div class="control-block">
+						<MonoLabel>COLOR</MonoLabel>
+						<ColorField label="Outline color" bind:value={outlineColor} />
+					</div>
+				</div>
+			</StepCard>
+
+			<StepCard
+				index={4}
+				type="STYLE"
+				title="Round corners"
+				onremove={() => {}}
+			>
+				<div class="step-tools"><Badge tone="success">AUTO</Badge></div>
+				<div class="controls compact">
+					<div class="control-block">
+						<MonoLabel>RADIUS</MonoLabel>
+						<SliderField
+							label="Corner radius"
+							bind:value={radius}
+							min={0}
+							max={48}
+							suffix="px"
+						/>
+					</div>
+					<label class="toggle-row">
+						<span>Preserve aspect ratio</span>
+						<Toggle
+							bind:checked={preserveAspect}
+							label="Preserve aspect ratio"
+						/>
+					</label>
+				</div>
+			</StepCard>
+		</div>
+
+		<div class="pipeline-footer">
+			<button class="reset-btn" onclick={() => {}}>
+				<RotateCcw size={14} /> Reset pipeline
+			</button>
+			<span class="auto-note"
+				><StatusDot /> changes are applied automatically</span
+			>
+		</div>
+	</section>
+
+	<section class="preview-panel">
+		<div class="preview-top">
+			<div>
+				<span class="label">PIPELINE OUTPUTS</span>
+				<strong>Visual history</strong>
+			</div>
+			<div class="preview-actions">
+				<button class="history-toggle" onclick={() => {}}>
+					Hide intermediate <ChevronDown size={15} />
+				</button>
+				<DownloadButton
+					label="Download result"
+					size="1.2 MB"
+					onclick={() => {}}
+				/>
+				<MetaList
+					items={[
+						{ caption: "DIMENSIONS", value: "1200 × 800 px" },
+						{ caption: "FORMAT", value: "PNG-24" },
+						{ caption: "SIZE", value: "1.2 MB" },
+					]}
+				/>
+				<IconButton
+					icon={Settings2}
+					label="Preview settings"
+					onclick={() => {}}
+				/>
+			</div>
+		</div>
+
+		<div class="preview-stack">
+			{#each previewTiles as tile (tile.label)}
+				<PreviewTile label={tile.label}>
+					<CheckerCanvas size="large">
+						<div
+							class="ph"
+							class:active={tile.active}
+							style="background:{tile.bg}; border-radius:{tile.radius ??
+								'0'}; box-shadow:{tile.ring ?? 'none'};"
+						>
+							<span class="sample-icon">PNG</span>
+							<span>easy-png-tools</span>
+						</div>
+					</CheckerCanvas>
+					<div class="tile-label-wrap">
+						<span class="tile-label">{tile.label}</span>
+						<span class="tile-caption">{tile.caption}</span>
+					</div>
+				</PreviewTile>
+			{/each}
+		</div>
+
+		<p class="preview-note">
+			Output is generated in-browser. Your files never leave this device.
+		</p>
+	</section>
+</div>
+
+<style>
+	.topbar {
+		border-bottom: 1px solid var(--line);
+		background: var(--panel);
+		display: flex;
+		justify-content: space-between;
+		align-items: center;
+		height: 64px;
+		padding: 0 clamp(20px, 4vw, 64px);
+	}
+	.brand {
+		display: flex;
+		align-items: center;
+		gap: 10px;
+		font: 600 14px var(--font-mono);
+	}
+	.brand-mark {
+		background: var(--blue);
+		color: #fff;
+		width: 30px;
+		height: 30px;
+		font-size: 11px;
+		display: grid;
+		place-items: center;
+	}
+	.version {
+		color: var(--blue);
+		font: 10px var(--font-mono);
+		letter-spacing: 0.12em;
+	}
+	.top-actions {
+		display: flex;
+		align-items: center;
+		gap: 16px;
+	}
+	.status {
+		display: flex;
+		align-items: center;
+		gap: 7px;
+		color: var(--muted);
+		font: 10px var(--font-mono);
+		letter-spacing: 0.08em;
+	}
+	.language :global(.segmented) {
+		height: 32px;
+	}
+	.page-grid {
+		display: grid;
+		grid-template-columns: minmax(0, 1.05fr) minmax(520px, 0.95fr);
+		align-items: start;
+		gap: 56px;
+		max-width: 1680px;
+		margin: 0 auto;
+		padding: 60px clamp(24px, 4vw, 72px) 72px;
+	}
+	.workspace {
+		min-width: 0;
+	}
+	.eyebrow {
+		font: 10px var(--font-mono);
+		letter-spacing: 0.12em;
+		color: var(--muted);
+		margin-bottom: 18px;
+	}
+	.eyebrow span {
+		margin: 0 7px;
+		color: var(--blue);
+	}
+	.title-row {
+		display: flex;
+		justify-content: space-between;
+		align-items: flex-end;
+		gap: 30px;
+		margin-bottom: 56px;
+	}
+	h1 {
+		margin: 0 0 16px;
+		font-size: clamp(36px, 4vw, 64px);
+		font-weight: 650;
+		letter-spacing: -0.06em;
+		color: var(--foreground);
+	}
+	.lede {
+		margin: 0;
+		max-width: 550px;
+		color: var(--muted);
+		line-height: 1.6;
+	}
+	.file-chip {
+		display: flex;
+		align-items: center;
+		gap: 8px;
+		white-space: nowrap;
+		border: 1px solid var(--line);
+		background: var(--panel);
+		font: 11px var(--font-mono);
+		color: var(--muted);
+		padding: 10px 12px;
+	}
+	.file-chip b {
+		color: var(--blue);
+		font-weight: 500;
+	}
+	.pipeline-head {
+		display: flex;
+		justify-content: space-between;
+		align-items: center;
+		border-bottom: 1px solid var(--line);
+		padding-bottom: 12px;
+	}
+	.label {
+		font: 10px var(--font-mono);
+		letter-spacing: 0.12em;
+		color: var(--muted);
+	}
+	.pipeline-head strong {
+		display: block;
+		margin-top: 5px;
+		font: 600 14px var(--font-mono);
+		color: var(--foreground);
+	}
+	.pipeline-head em {
+		color: #25a96a;
+		font-style: normal;
+		font-size: 10px;
+	}
+	.add-btn {
+		display: flex;
+		align-items: center;
+		gap: 7px;
+		color: var(--blue);
+		background: none;
+		border: 0;
+		font-size: 12px;
+		cursor: pointer;
+	}
+	.steps-list {
+		display: grid;
+		gap: 10px;
+		padding-top: 14px;
+	}
+	.step-tools {
+		display: flex;
+		gap: 8px;
+		align-items: center;
+	}
+	.controls {
+		display: grid;
+		grid-template-columns: 1.1fr 1fr 1.2fr;
+		gap: 16px;
+	}
+	.controls.compact {
+		grid-template-columns: 1fr 1fr;
+	}
+	.control-block {
+		display: flex;
+		flex-direction: column;
+		gap: 8px;
+	}
+	.transform-note {
+		display: flex;
+		align-items: center;
+		gap: 8px;
+		color: var(--muted);
+		font: 11px var(--font-mono);
+	}
+	.toggle-row {
+		display: flex;
+		align-items: center;
+		justify-content: space-between;
+		gap: 15px;
+		color: var(--foreground);
+		font-size: 0.85rem;
+		cursor: pointer;
+	}
+	.pipeline-footer {
+		display: flex;
+		justify-content: space-between;
+		align-items: center;
+		padding-top: 18px;
+	}
+	.reset-btn {
+		display: flex;
+		align-items: center;
+		gap: 7px;
+		color: var(--blue);
+		background: none;
+		border: 0;
+		cursor: pointer;
+		font-size: 12px;
+	}
+	.auto-note {
+		display: flex;
+		align-items: center;
+		gap: 8px;
+		color: var(--muted);
+		font: 11px var(--font-mono);
+	}
+	.preview-panel {
+		position: sticky;
+		top: 24px;
+		border: 1px solid var(--line);
+		background: var(--panel);
+		padding: 18px;
+		min-width: 0;
+	}
+	.preview-top {
+		display: flex;
+		justify-content: space-between;
+		align-items: center;
+		border-bottom: 1px solid var(--line);
+		padding-bottom: 15px;
+		gap: 16px;
+	}
+	.preview-top strong {
+		display: block;
+		margin-top: 5px;
+		font: 600 14px var(--font-mono);
+	}
+	.preview-actions {
+		display: flex;
+		flex-wrap: wrap;
+		align-items: center;
+		justify-content: flex-end;
+		gap: 10px;
+	}
+	.history-toggle {
+		display: flex;
+		align-items: center;
+		justify-content: center;
+		gap: 8px;
+		width: 100%;
+		margin-top: 18px;
+		border: 1px solid var(--line);
+		color: var(--muted);
+		font: 10px var(--font-mono);
+		letter-spacing: 0.04em;
+		background: none;
+		padding: 11px 14px;
+		cursor: pointer;
+	}
+	.history-toggle:hover {
+		color: var(--foreground);
+		background: var(--background);
+	}
+	.preview-stack {
+		display: grid;
+		grid-template-columns: 1fr 1fr;
+		gap: 12px;
+		padding: 16px 0;
+	}
+	.ph {
+		width: 80%;
+		aspect-ratio: 1.35;
+		display: flex;
+		flex-direction: column;
+		justify-content: center;
+		align-items: center;
+		gap: 5px;
+		color: #16202b;
+		font: 600 10px var(--font-mono);
+	}
+	.ph.active {
+		border-color: var(--blue);
+	}
+	.sample-icon {
+		border: 1px solid;
+		padding: 3px 5px;
+		font-size: 9px;
+	}
+	.tile-label-wrap {
+		display: flex;
+		justify-content: space-between;
+		gap: 8px;
+		padding: 8px;
+		border-top: 1px solid var(--line);
+		font: 9px var(--font-mono);
+		color: var(--blue);
+	}
+	.tile-caption {
+		color: var(--muted);
+		font-weight: 400;
+		text-align: right;
+	}
+	.preview-note {
+		margin: 12px 0 0;
+		color: var(--muted);
+		font-size: 11px;
+		line-height: 1.5;
+	}
+	@media (max-width: 800px) {
+		.page-grid {
+			grid-template-columns: 1fr;
+			gap: 24px;
+			padding: 36px 16px 48px;
+		}
+		.title-row {
+			flex-direction: column;
+			align-items: flex-start;
+		}
+		.preview-panel {
+			position: static;
+		}
+		.controls,
+		.controls.compact {
+			grid-template-columns: 1fr;
+		}
+		.preview-stack {
+			grid-template-columns: 1fr;
+		}
+	}
+</style>