feat: scrollable layout

.mcp.json

@@ -42,6 +42,10 @@
         "PERPLEXITY_TIMEOUT_MS": "600000"
       }
     },
+    "chrome-devtools": {
+      "command": "npx",
+      "args": ["-y", "chrome-devtools-mcp@latest"]
+    },
     "browsermcp": {
       "type": "stdio",
       "command": "npx",

apps/landing/src/app/(lab)/lab/generate/page.tsx

@@ -0,0 +1,14 @@
+'use client';
+
+import { Section } from '@/components/shared/Section';
+import { GenerateFormPlaceholder } from '@/components/lab/GenerateFormPlaceholder';
+
+const GeneratePage = () => {
+  return (
+    <Section className="py-12 md:py-16 min-h-screen">
+      <GenerateFormPlaceholder />
+    </Section>
+  );
+};
+
+export default GeneratePage;

apps/landing/src/app/(lab)/lab/images/page.tsx

@@ -0,0 +1,28 @@
+'use client';
+
+import { Section } from '@/components/shared/Section';
+
+const ImagesPage = () => {
+  return (
+    <Section className="py-12 md:py-16 min-h-screen">
+      <header className="mb-8 md:mb-12">
+        <h1 className="text-3xl md:text-4xl lg:text-5xl font-bold text-white mb-3">
+          Image Library
+        </h1>
+        <p className="text-gray-400 text-base md:text-lg">
+          Browse and manage your generated images
+        </p>
+      </header>
+
+      <div className="p-8 bg-slate-900/80 backdrop-blur-sm border border-slate-700 rounded-2xl">
+        <div className="text-center py-12">
+          <div className="text-6xl mb-4">🖼️</div>
+          <h2 className="text-2xl font-semibold text-white mb-2">Image Browser</h2>
+          <p className="text-gray-400">Component will be implemented here</p>
+        </div>
+      </div>
+    </Section>
+  );
+};
+
+export default ImagesPage;

apps/landing/src/app/(lab)/lab/layout.tsx

@@ -0,0 +1,55 @@
+'use client';
+
+/**
+ * Lab Section Layout
+ *
+ * Code Style:
+ * - Use `const` arrow function components (not function declarations)
+ * - Use `type` instead of `interface` for type definitions
+ * - Early returns for conditionals
+ * - No inline comments (JSDoc headers only)
+ * - Tailwind classes only
+ *
+ * Structure:
+ * - Layout components: src/components/layout/lab/
+ * - Feature components: src/components/lab/
+ * - Pages: src/app/lab/{section}/page.tsx
+ *
+ * Sub-navigation items:
+ * - /lab/generate - Image generation
+ * - /lab/images - Image library browser
+ * - /lab/live - Live generation testing
+ * - /lab/upload - File upload interface
+ */
+
+import { ReactNode } from 'react';
+import { usePathname } from 'next/navigation';
+import { ApiKeyWidget } from '@/components/shared/ApiKeyWidget/apikey-widget';
+import { ApiKeyProvider } from '@/components/shared/ApiKeyWidget/apikey-context';
+import { PageProvider } from '@/contexts/page-context';
+import { LabLayout } from '@/components/layout/lab/LabLayout';
+
+type LabLayoutWrapperProps = {
+  children: ReactNode;
+};
+
+const navItems = [
+  { label: 'Generate', href: '/lab/generate' },
+  { label: 'Images', href: '/lab/images' },
+  { label: 'Live', href: '/lab/live' },
+  { label: 'Upload', href: '/lab/upload' },
+];
+
+const LabLayoutWrapper = ({ children }: LabLayoutWrapperProps) => {
+  const pathname = usePathname();
+
+  return (
+    <ApiKeyProvider>
+      <PageProvider navItems={navItems} currentPath={pathname} rightSlot={<ApiKeyWidget />}>
+        <LabLayout>{children}</LabLayout>
+      </PageProvider>
+    </ApiKeyProvider>
+  );
+};
+
+export default LabLayoutWrapper;

apps/landing/src/app/(lab)/lab/live/page.tsx

@@ -0,0 +1,28 @@
+'use client';
+
+import { Section } from '@/components/shared/Section';
+
+const LivePage = () => {
+  return (
+    <Section className="py-12 md:py-16 min-h-screen">
+      <header className="mb-8 md:mb-12">
+        <h1 className="text-3xl md:text-4xl lg:text-5xl font-bold text-white mb-3">
+          Live Generation
+        </h1>
+        <p className="text-gray-400 text-base md:text-lg">
+          Real-time testing and experimentation workspace
+        </p>
+      </header>
+
+      <div className="p-8 bg-slate-900/80 backdrop-blur-sm border border-slate-700 rounded-2xl">
+        <div className="text-center py-12">
+          <div className="text-6xl mb-4">⚡</div>
+          <h2 className="text-2xl font-semibold text-white mb-2">Live Testing Interface</h2>
+          <p className="text-gray-400">Component will be implemented here</p>
+        </div>
+      </div>
+    </Section>
+  );
+};
+
+export default LivePage;

apps/landing/src/app/(lab)/lab/page.tsx

@@ -0,0 +1,16 @@
+'use client';
+
+import { useEffect } from 'react';
+import { useRouter } from 'next/navigation';
+
+const LabPage = () => {
+  const router = useRouter();
+
+  useEffect(() => {
+    router.replace('/lab/generate');
+  }, [router]);
+
+  return null;
+};
+
+export default LabPage;

apps/landing/src/app/(lab)/lab/upload/page.tsx

@@ -0,0 +1,28 @@
+'use client';
+
+import { Section } from '@/components/shared/Section';
+
+const UploadPage = () => {
+  return (
+    <Section className="py-12 md:py-16 min-h-screen">
+      <header className="mb-8 md:mb-12">
+        <h1 className="text-3xl md:text-4xl lg:text-5xl font-bold text-white mb-3">
+          File Upload
+        </h1>
+        <p className="text-gray-400 text-base md:text-lg">
+          Upload and manage reference images for generation
+        </p>
+      </header>
+
+      <div className="p-8 bg-slate-900/80 backdrop-blur-sm border border-slate-700 rounded-2xl">
+        <div className="text-center py-12">
+          <div className="text-6xl mb-4">📤</div>
+          <h2 className="text-2xl font-semibold text-white mb-2">Upload Interface</h2>
+          <p className="text-gray-400">Component will be implemented here</p>
+        </div>
+      </div>
+    </Section>
+  );
+};
+
+export default UploadPage;

apps/landing/src/app/(lab)/layout.tsx

@@ -0,0 +1,54 @@
+'use client';
+
+import Image from 'next/image';
+import { LabScrollProvider, useLabScroll } from '@/contexts/lab-scroll-context';
+
+const LabHeader = () => {
+  const { isScrolled } = useLabScroll();
+
+  return (
+    <header
+      className={`
+        relative z-10 border-b border-white/10 backdrop-blur-sm shrink-0
+        transition-all duration-300 ease-in-out
+        ${isScrolled ? 'h-0 opacity-0 overflow-hidden border-b-0' : 'h-16 opacity-100'}
+      `}
+    >
+      <nav className="max-w-7xl mx-auto px-6 py-3 flex justify-between items-center h-16">
+        <div className="h-full flex items-center">
+          <Image
+            src="/banatie-logo-horisontal.png"
+            alt="Banatie Logo"
+            width={150}
+            height={40}
+            priority
+            className="h-full w-auto object-contain"
+          />
+        </div>
+        <a
+          href="#waitlist"
+          className="text-sm text-gray-300 hover:text-white transition-colors"
+        >
+          Join Beta
+        </a>
+      </nav>
+    </header>
+  );
+};
+
+export default function LabLayout({
+  children,
+}: Readonly<{
+  children: React.ReactNode;
+}>) {
+  return (
+    <LabScrollProvider>
+      <div className="h-screen overflow-hidden flex flex-col">
+        <LabHeader />
+        <div className="flex-1 min-h-0">
+          {children}
+        </div>
+      </div>
+    </LabScrollProvider>
+  );
+}

apps/landing/src/app/(main)/layout.tsx

@@ -0,0 +1,37 @@
+import Image from 'next/image';
+import { Footer } from '@/components/shared/Footer';
+
+export default function MainLayout({
+  children,
+}: Readonly<{
+  children: React.ReactNode;
+}>) {
+  return (
+    <>
+      <header className="relative z-10 border-b border-white/10 backdrop-blur-sm">
+        <nav className="max-w-7xl mx-auto px-6 py-3 flex justify-between items-center h-16">
+          <div className="h-full flex items-center">
+            <Image
+              src="/banatie-logo-horisontal.png"
+              alt="Banatie Logo"
+              width={150}
+              height={40}
+              priority
+              className="h-full w-auto object-contain"
+            />
+          </div>
+          <a
+            href="#waitlist"
+            className="text-sm text-gray-300 hover:text-white transition-colors"
+          >
+            Join Beta
+          </a>
+        </nav>
+      </header>
+
+      {children}
+
+      <Footer />
+    </>
+  );
+}

apps/landing/src/app/layout.tsx

@@ -1,7 +1,5 @@
 import type { Metadata } from 'next';
 import { Inter } from 'next/font/google';
-import Image from 'next/image';
-import { Footer } from '@/components/shared/Footer';
 import './globals.css';
 
 const inter = Inter({
@@ -71,38 +69,12 @@ export default function RootLayout({
       </head>
       <body className={`${inter.variable} antialiased`}>
         <div className="min-h-screen bg-gradient-to-br from-slate-950 via-slate-900 to-slate-950">
-          {/* Animated gradient background */}
           <div className="fixed inset-0 overflow-hidden pointer-events-none">
             <div className="absolute top-1/4 -left-1/4 w-96 h-96 bg-purple-600/10 rounded-full blur-3xl animate-pulse"></div>
             <div className="absolute bottom-1/4 -right-1/4 w-96 h-96 bg-cyan-600/10 rounded-full blur-3xl animate-pulse delay-700"></div>
           </div>
 
-          {/* Header */}
-          <header className="relative z-10 border-b border-white/10 backdrop-blur-sm">
-            <nav className="max-w-7xl mx-auto px-6 py-3 flex justify-between items-center h-16">
-              <div className="h-full flex items-center">
-                <Image
-                  src="/banatie-logo-horisontal.png"
-                  alt="Banatie Logo"
-                  width={150}
-                  height={40}
-                  priority
-                  className="h-full w-auto object-contain"
-                />
-              </div>
-              <a
-                href="#waitlist"
-                className="text-sm text-gray-300 hover:text-white transition-colors"
-              >
-                Join Beta
-              </a>
-            </nav>
-          </header>
-
-          {/* Page content */}
           {children}
-
-          <Footer />
         </div>
       </body>
     </html>

apps/landing/src/components/lab/FilterPlaceholder.tsx

@@ -0,0 +1,83 @@
+'use client';
+
+/**
+ * Filter Placeholder Component
+ *
+ * Checkbox/radio button group for sidebar filters.
+ * Supports both single-select (radio) and multi-select (checkbox) modes.
+ *
+ * Features:
+ * - Radio buttons for single selection
+ * - Checkboxes for multiple selection
+ * - Option counts (e.g., "All (127)")
+ * - Accessible keyboard navigation
+ * - Focus indicators
+ */
+
+import { useState } from 'react';
+
+type FilterOption = {
+  id: string;
+  label: string;
+  count?: number;
+};
+
+type FilterPlaceholderProps = {
+  options: FilterOption[];
+  multiSelect?: boolean;
+  groupId: string;
+};
+
+export const FilterPlaceholder = ({
+  options,
+  multiSelect = false,
+  groupId,
+}: FilterPlaceholderProps) => {
+  const [selected, setSelected] = useState<string[]>(multiSelect ? [] : [options[0]?.id || '']);
+
+  const handleSelect = (optionId: string) => {
+    if (multiSelect) {
+      setSelected((prev) =>
+        prev.includes(optionId) ? prev.filter((id) => id !== optionId) : [...prev, optionId]
+      );
+    } else {
+      setSelected([optionId]);
+    }
+  };
+
+  const isSelected = (optionId: string) => selected.includes(optionId);
+
+  return (
+    <div className="mt-2 space-y-1" role="group" aria-label={`${groupId} filters`}>
+      {options.map((option) => {
+        const checked = isSelected(option.id);
+        const inputId = `${groupId}-${option.id}`;
+
+        return (
+          <label
+            key={option.id}
+            htmlFor={inputId}
+            className="flex items-center gap-2 px-2 py-1.5 rounded-md text-sm cursor-pointer transition-colors hover:bg-white/5 group"
+          >
+            <input
+              type={multiSelect ? 'checkbox' : 'radio'}
+              id={inputId}
+              name={groupId}
+              checked={checked}
+              onChange={() => handleSelect(option.id)}
+              className="w-4 h-4 bg-slate-800 border-slate-600 text-purple-600 focus:ring-2 focus:ring-purple-500 focus:ring-offset-0 rounded cursor-pointer"
+            />
+            <span className={`flex-1 ${checked ? 'text-white font-medium' : 'text-gray-400 group-hover:text-gray-300'}`}>
+              {option.label}
+            </span>
+            {option.count !== undefined && (
+              <span className="text-xs text-gray-600">
+                {option.count}
+              </span>
+            )}
+          </label>
+        );
+      })}
+    </div>
+  );
+};

apps/landing/src/components/lab/GenerateFormPlaceholder.tsx

@@ -0,0 +1,211 @@
+'use client';
+
+/**
+ * Generate Form Placeholder Component
+ *
+ * Main content placeholder for lab generation interface.
+ * Matches the /demo/tti page visual style with form card and results area.
+ *
+ * Features:
+ * - Header with title and description
+ * - Prompt textarea (similar to TTI page)
+ * - Options row with selects and buttons
+ * - Submit button with gradient styling
+ * - Results area placeholder
+ * - Keyboard shortcuts (Ctrl+Enter)
+ */
+
+import { useState, useRef, KeyboardEvent } from 'react';
+
+export const GenerateFormPlaceholder = () => {
+  const [prompt, setPrompt] = useState('');
+  const [aspectRatio, setAspectRatio] = useState('1:1');
+  const [template, setTemplate] = useState('photorealistic');
+  const [generating, setGenerating] = useState(false);
+  const textareaRef = useRef<HTMLTextAreaElement>(null);
+
+  const handleGenerate = () => {
+    if (!prompt.trim()) return;
+    setGenerating(true);
+    setTimeout(() => setGenerating(false), 2000);
+  };
+
+  const handleKeyDown = (e: KeyboardEvent<HTMLTextAreaElement>) => {
+    if (e.ctrlKey && e.key === 'Enter') {
+      e.preventDefault();
+      handleGenerate();
+    }
+  };
+
+  return (
+    <div className="min-h-screen">
+      {/* Page Header */}
+      <header className="mb-8 md:mb-12">
+        <h1 className="text-3xl md:text-4xl lg:text-5xl font-bold text-white mb-3">
+          Generate Workbench
+        </h1>
+        <p className="text-gray-400 text-base md:text-lg">
+          Create and experiment with AI-generated images
+        </p>
+      </header>
+
+      {/* Info Banner (Placeholder) */}
+      <div className="mb-6 p-5 bg-purple-900/10 border border-purple-700/50 rounded-2xl">
+        <div className="flex items-center justify-between flex-wrap gap-4">
+          <div>
+            <h3 className="text-lg font-semibold text-white mb-1">Lab Environment</h3>
+            <p className="text-sm text-gray-400">
+              This is an experimental interface for testing generation features
+            </p>
+          </div>
+          <div className="flex items-center gap-2 text-sm text-purple-400">
+            <span className="w-2 h-2 bg-purple-500 rounded-full animate-pulse"></span>
+            <span>Active</span>
+          </div>
+        </div>
+      </div>
+
+      {/* Generation Form Card */}
+      <section
+        className="mb-8 p-6 bg-slate-900/80 backdrop-blur-sm border border-slate-700 rounded-2xl"
+        aria-label="Image Generation Form"
+      >
+        {/* Prompt Textarea */}
+        <div className="mb-4">
+          <label htmlFor="lab-prompt-input" className="block text-lg font-semibold text-white mb-3">
+            Your Prompt
+          </label>
+          <textarea
+            id="lab-prompt-input"
+            ref={textareaRef}
+            value={prompt}
+            onChange={(e) => setPrompt(e.target.value)}
+            onKeyDown={handleKeyDown}
+            placeholder="Describe the image you want to generate..."
+            disabled={generating}
+            rows={5}
+            className="w-full px-4 py-3 bg-slate-800 border border-slate-700 rounded-lg text-white placeholder-gray-500 focus:outline-none focus:ring-2 focus:ring-purple-500 focus:border-transparent disabled:opacity-50 disabled:cursor-not-allowed resize-none"
+            aria-label="Image generation prompt"
+          />
+          <p className="mt-2 text-xs text-gray-500">
+            Tip: Be specific and descriptive for better results
+          </p>
+        </div>
+
+        {/* Options Row */}
+        <div className="mb-4 grid grid-cols-1 md:grid-cols-3 gap-3">
+          {/* Aspect Ratio */}
+          <div>
+            <label
+              htmlFor="lab-aspect-ratio"
+              className="block text-xs font-medium text-gray-400 mb-1.5"
+            >
+              Aspect Ratio
+            </label>
+            <select
+              id="lab-aspect-ratio"
+              value={aspectRatio}
+              onChange={(e) => setAspectRatio(e.target.value)}
+              disabled={generating}
+              className="w-full px-3 py-2 text-sm bg-slate-800 border border-slate-700 rounded-lg text-white focus:outline-none focus:ring-2 focus:ring-purple-500 focus:border-transparent disabled:opacity-50 disabled:cursor-not-allowed"
+            >
+              <option value="1:1">Square (1:1)</option>
+              <option value="3:4">Portrait (3:4)</option>
+              <option value="4:3">Landscape (4:3)</option>
+              <option value="9:16">Vertical (9:16)</option>
+              <option value="16:9">Widescreen (16:9)</option>
+              <option value="21:9">Ultrawide (21:9)</option>
+            </select>
+          </div>
+
+          {/* Template */}
+          <div>
+            <label htmlFor="lab-template" className="block text-xs font-medium text-gray-400 mb-1.5">
+              Style Template
+            </label>
+            <select
+              id="lab-template"
+              value={template}
+              onChange={(e) => setTemplate(e.target.value)}
+              disabled={generating}
+              className="w-full px-3 py-2 text-sm bg-slate-800 border border-slate-700 rounded-lg text-white focus:outline-none focus:ring-2 focus:ring-purple-500 focus:border-transparent disabled:opacity-50 disabled:cursor-not-allowed"
+            >
+              <option value="photorealistic">Photorealistic</option>
+              <option value="illustration">Illustration</option>
+              <option value="minimalist">Minimalist</option>
+              <option value="sticker">Sticker</option>
+              <option value="product">Product</option>
+              <option value="comic">Comic</option>
+              <option value="general">General</option>
+            </select>
+          </div>
+
+          {/* Advanced Options Button */}
+          <div>
+            <label className="block text-xs font-medium text-gray-400 mb-1.5">
+              Advanced Options
+            </label>
+            <button
+              disabled={generating}
+              className="w-full px-3 py-2 text-sm bg-slate-800 border border-slate-700 rounded-lg text-gray-400 hover:text-white hover:bg-slate-700 transition-colors disabled:opacity-50 disabled:cursor-not-allowed flex items-center justify-center gap-2"
+              aria-label="Advanced options"
+            >
+              <span>⚙️</span>
+              <span>Configure</span>
+            </button>
+          </div>
+        </div>
+
+        {/* Submit Button Row */}
+        <div className="flex items-center justify-between gap-4 flex-wrap pt-2 border-t border-slate-700/50">
+          <div className="text-sm text-gray-500">
+            {generating ? (
+              <span className="flex items-center gap-2">
+                <span className="w-2 h-2 bg-purple-500 rounded-full animate-pulse"></span>
+                Generating...
+              </span>
+            ) : (
+              'Press Ctrl+Enter to submit'
+            )}
+          </div>
+          <button
+            onClick={handleGenerate}
+            disabled={generating || !prompt.trim()}
+            className="px-6 py-2.5 rounded-lg bg-gradient-to-r from-purple-600 to-cyan-600 text-white font-semibold hover:from-purple-500 hover:to-cyan-500 transition-all disabled:opacity-50 disabled:cursor-not-allowed shadow-lg shadow-purple-900/30 focus:ring-2 focus:ring-purple-500"
+          >
+            {generating ? 'Generating...' : 'Generate Images'}
+          </button>
+        </div>
+      </section>
+
+      {/* Results Area Placeholder */}
+      <section className="space-y-6" aria-label="Generated Results">
+        <div className="flex items-center justify-between">
+          <h2 className="text-xl md:text-2xl font-bold text-white">Results</h2>
+          <button className="text-sm text-gray-500 hover:text-gray-300 transition-colors">
+            Clear All
+          </button>
+        </div>
+
+        {/* Empty State */}
+        <div className="p-12 bg-slate-900/50 backdrop-blur-sm border border-slate-700 rounded-2xl text-center">
+          <div className="mb-4 text-5xl">🎨</div>
+          <h3 className="text-lg font-semibold text-white mb-2">No results yet</h3>
+          <p className="text-gray-400 text-sm">
+            Generate your first image to see results here
+          </p>
+        </div>
+
+        {/* Result Cards Placeholder (would appear after generation) */}
+        {generating && (
+          <div className="p-6 bg-slate-900/80 backdrop-blur-sm border border-slate-700 rounded-2xl animate-pulse">
+            <div className="grid grid-cols-1 md:grid-cols-2 gap-6">
+              <div className="aspect-square bg-slate-800 rounded-lg"></div>
+              <div className="aspect-square bg-slate-800 rounded-lg"></div>
+            </div>
+          </div>
+        )}
+      </section>
+    </div>
+  );
+};

apps/landing/src/components/layout/lab/LabFooter.tsx

@@ -0,0 +1,62 @@
+'use client';
+
+/**
+ * Lab Footer Component
+ *
+ * Simple 1-line footer for lab section with contextual navigation links.
+ * Displays copyright on left and contextual docs/API links on right.
+ */
+
+import { usePathname } from 'next/navigation';
+import Link from 'next/link';
+
+type LinkMapEntry = {
+  docs: string;
+  api: string;
+};
+
+type LinkMap = {
+  [key: string]: LinkMapEntry;
+};
+
+const linkMap: LinkMap = {
+  '/lab/generate': { docs: '/docs', api: '/docs/api/text-to-image' },
+  '/lab/images': { docs: '/docs', api: '/docs/api/images' },
+  '/lab/live': { docs: '/docs', api: '/docs/api/text-to-image' },
+  '/lab/upload': { docs: '/docs', api: '/docs/api/upload' },
+};
+
+export const LabFooter = () => {
+  const pathname = usePathname();
+  const links = linkMap[pathname] || { docs: '/docs', api: '/docs/api' };
+
+  return (
+    <footer
+      className="border-t border-white/10 bg-slate-950/50 backdrop-blur-sm"
+      role="contentinfo"
+    >
+      <div className="flex flex-col md:flex-row md:items-center md:justify-between gap-4 md:gap-0 px-6 py-4 md:h-14">
+        {/* Left: Copyright */}
+        <p className="text-sm text-gray-500 order-2 md:order-1">
+          © 2025 Banatie. Built for builders who create.
+        </p>
+
+        {/* Right: Contextual Links */}
+        <nav aria-label="Footer navigation" className="flex items-center gap-6 order-1 md:order-2">
+          <Link
+            href={links.docs}
+            className="text-sm text-gray-500 hover:text-white transition-colors min-h-[44px] flex items-center"
+          >
+            Documentation
+          </Link>
+          <Link
+            href={links.api}
+            className="text-sm text-gray-500 hover:text-white transition-colors min-h-[44px] flex items-center"
+          >
+            API Reference
+          </Link>
+        </nav>
+      </div>
+    </footer>
+  );
+};

apps/landing/src/components/layout/lab/LabLayout.tsx

@@ -0,0 +1,76 @@
+'use client';
+
+/**
+ * Lab Layout Component
+ *
+ * Main layout wrapper for the Lab section combining sidebar and content.
+ * Uses ThreeColumnLayout for consistent column structure across the app.
+ *
+ * Structure:
+ * - Left: LabSidebar (w-64, hidden lg:block, scrollable)
+ * - Center: Scrollable content area + fixed LabFooter at bottom
+ * - Right: Reserved for future use (TOC, preview panels, etc.)
+ *
+ * The center column uses a fixed height container with:
+ * - Scrollable content area (flex-1 overflow-y-auto)
+ * - Sticky footer always visible at bottom
+ *
+ * This layout is rendered inside PageProvider context which provides:
+ * - SubsectionNav at the top
+ * - ApiKeyWidget in the right slot
+ * - AnimatedBackground
+ *
+ * Scroll Detection:
+ * - Detects scroll in the main content area
+ * - After 50px threshold, collapses the main header via LabScrollContext
+ * - Height adjusts dynamically: 100vh-7rem (header visible) → 100vh-3rem (header hidden)
+ */
+
+import { ReactNode, useRef, useEffect, useCallback } from 'react';
+import { ThreeColumnLayout } from '@/components/layout/ThreeColumnLayout';
+import { LabSidebar } from './LabSidebar';
+import { LabFooter } from './LabFooter';
+import { useLabScroll } from '@/contexts/lab-scroll-context';
+
+type LabLayoutProps = {
+  children: ReactNode;
+};
+
+const SCROLL_THRESHOLD = 50;
+
+export const LabLayout = ({ children }: LabLayoutProps) => {
+  const { isScrolled, setIsScrolled } = useLabScroll();
+  const contentRef = useRef<HTMLDivElement>(null);
+
+  const handleScroll = useCallback(() => {
+    if (!contentRef.current) return;
+    const scrollTop = contentRef.current.scrollTop;
+    setIsScrolled(scrollTop > SCROLL_THRESHOLD);
+  }, [setIsScrolled]);
+
+  useEffect(() => {
+    const contentElement = contentRef.current;
+    if (!contentElement) return;
+
+    contentElement.addEventListener('scroll', handleScroll);
+    return () => contentElement.removeEventListener('scroll', handleScroll);
+  }, [handleScroll]);
+
+  const containerHeight = isScrolled ? 'h-[calc(100vh-3rem)]' : 'h-[calc(100vh-7rem)]';
+
+  return (
+    <ThreeColumnLayout
+      left={
+        <div className={`border-r border-white/10 bg-slate-950/50 backdrop-blur-sm ${containerHeight} overflow-y-auto transition-all duration-300`}>
+          <LabSidebar />
+        </div>
+      }
+      center={
+        <div className={`flex flex-col ${containerHeight} transition-all duration-300`}>
+          <div ref={contentRef} className="flex-1 overflow-y-auto min-h-0">{children}</div>
+          <LabFooter />
+        </div>
+      }
+    />
+  );
+};

apps/landing/src/components/layout/lab/LabSidebar.tsx

@@ -0,0 +1,135 @@
+'use client';
+
+/**
+ * Lab Sidebar - Filter Panel
+ *
+ * Narrow left sidebar for filtering lab content.
+ * Matches DocsSidebar visual style with collapsible filter sections.
+ *
+ * Features:
+ * - Multiple filter groups (Status, Date Range, Source Type)
+ * - Collapsible sections
+ * - Checkbox/radio button controls
+ * - Clean, minimal design
+ */
+
+import { useState } from 'react';
+import { FilterPlaceholder } from '@/components/lab/FilterPlaceholder';
+
+type FilterGroupProps = {
+  id: string;
+  label: string;
+  icon: string;
+  options: Array<{ id: string; label: string; count?: number }>;
+  multiSelect?: boolean;
+};
+
+const filterGroups: FilterGroupProps[] = [
+  {
+    id: 'status',
+    label: 'Status',
+    icon: '📊',
+    options: [
+      { id: 'all', label: 'All', count: 127 },
+      { id: 'completed', label: 'Completed', count: 98 },
+      { id: 'pending', label: 'Pending', count: 23 },
+      { id: 'failed', label: 'Failed', count: 6 },
+    ],
+    multiSelect: false,
+  },
+  {
+    id: 'date',
+    label: 'Date Range',
+    icon: '📅',
+    options: [
+      { id: 'today', label: 'Today', count: 12 },
+      { id: 'week', label: 'Last 7 days', count: 45 },
+      { id: 'month', label: 'Last 30 days', count: 89 },
+      { id: 'all-time', label: 'All time', count: 127 },
+    ],
+    multiSelect: false,
+  },
+  {
+    id: 'source',
+    label: 'Source Type',
+    icon: '🎨',
+    options: [
+      { id: 'text', label: 'Text-to-Image', count: 78 },
+      { id: 'upload', label: 'Uploads', count: 34 },
+      { id: 'reference', label: 'Reference Images', count: 15 },
+    ],
+    multiSelect: true,
+  },
+];
+
+export const LabSidebar = () => {
+  const [expandedSections, setExpandedSections] = useState<string[]>(['status', 'date', 'source']);
+
+  const toggleSection = (id: string) => {
+    setExpandedSections((prev) =>
+      prev.includes(id) ? prev.filter((item) => item !== id) : [...prev, id]
+    );
+  };
+
+  const isExpanded = (id: string) => expandedSections.includes(id);
+
+  return (
+    <aside className="h-full bg-slate-950 border-r border-white/10" aria-label="Lab filters">
+      {/* Header */}
+      <div className="p-6 border-b border-slate-800">
+        <h2 className="text-lg font-semibold text-white">Filters</h2>
+        <p className="text-xs text-gray-500 mt-1">Refine your results</p>
+      </div>
+
+      {/* Filter Groups */}
+      <div className="p-4 space-y-4">
+        {filterGroups.map((group) => {
+          const expanded = isExpanded(group.id);
+
+          return (
+            <div key={group.id} className="border-b border-slate-800 pb-4 last:border-b-0">
+              {/* Section Header */}
+              <button
+                onClick={() => toggleSection(group.id)}
+                className="w-full flex items-center justify-between px-2 py-2 rounded-lg text-sm transition-colors text-gray-400 hover:text-white hover:bg-white/5"
+                aria-expanded={expanded}
+              >
+                <span className="flex items-center gap-2">
+                  <span className="text-base">{group.icon}</span>
+                  <span className="font-medium">{group.label}</span>
+                </span>
+                <svg
+                  className={`w-4 h-4 transition-transform ${expanded ? 'rotate-90' : ''}`}
+                  fill="none"
+                  viewBox="0 0 24 24"
+                  stroke="currentColor"
+                >
+                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 5l7 7-7 7" />
+                </svg>
+              </button>
+
+              {/* Filter Options */}
+              {expanded && (
+                <FilterPlaceholder
+                  options={group.options}
+                  multiSelect={group.multiSelect}
+                  groupId={group.id}
+                />
+              )}
+            </div>
+          );
+        })}
+      </div>
+
+      {/* Bottom Actions */}
+      <div className="mt-auto p-4 border-t border-slate-800">
+        <button
+          className="w-full px-3 py-2 text-sm text-gray-500 hover:text-gray-300 transition-colors rounded-lg hover:bg-white/5"
+          aria-label="Reset all filters"
+        >
+          Reset Filters
+        </button>
+      </div>
+    </aside>
+  );
+};

apps/landing/src/contexts/lab-scroll-context.tsx

@@ -0,0 +1,39 @@
+'use client';
+
+/**
+ * Lab Scroll Context
+ *
+ * Shares scroll state between the main content area and the header.
+ * Used to collapse the main header when user scrolls in the lab section.
+ */
+
+import { createContext, useContext, useState, ReactNode } from 'react';
+
+type LabScrollContextValue = {
+  isScrolled: boolean;
+  setIsScrolled: (value: boolean) => void;
+};
+
+const LabScrollContext = createContext<LabScrollContextValue | null>(null);
+
+export const useLabScroll = () => {
+  const context = useContext(LabScrollContext);
+  if (!context) {
+    throw new Error('useLabScroll must be used within LabScrollProvider');
+  }
+  return context;
+};
+
+type LabScrollProviderProps = {
+  children: ReactNode;
+};
+
+export const LabScrollProvider = ({ children }: LabScrollProviderProps) => {
+  const [isScrolled, setIsScrolled] = useState(false);
+
+  return (
+    <LabScrollContext.Provider value={{ isScrolled, setIsScrolled }}>
+      {children}
+    </LabScrollContext.Provider>
+  );
+};