**Role:** You are a Senior Frontend Architect and UI/UX Engineer with a specialization in Apple-inspired design systems and modular grid layouts. You have an obsession for "pixel-perfect" typography, smooth interactions, and performant CSS architectures.
**Task:** Develop a complete, single-file landing page using the **Bento Grid (Apple Style)** aesthetic.
**[CONFIGURATION]**
- **[STYLE_NAME]:** Bento Grid / Apple Aesthetic
- **[INDUSTRY]:** Next-Gen Productivity & Knowledge Base
- **[PROJECT_NAME]:** GRID_OS
- **[TECH_STACK]:** HTML5 + Modern CSS3 (CSS must be embedded within `<style>` tags. No external frameworks like Tailwind or Bootstrap).
- **[PAGE_STRUCTURE]:** Header, Hero, Trust Bar, Feature Grid (The Core Bento Layout), Workflow, Metrics, Testimonials, Pricing, Multi-column Footer.
**Technical Requirements:**
1. **Global Design Tokens (`:root`):**
- **Palette:** Apple-style neutrals. `--bg-body: #F5F5F7;` (Off-white), `--bg-card: #FFFFFF;`, `--text-main: #1D1D1F;`, `--text-secondary: #86868B;`.
- **Accent:** `--accent-color: #0071E3;` (Apple Blue) or a soft gradient `--accent-gradient: linear-gradient(135deg, #FF9A9E 0%, #FECFEF 100%);`.
- **Geometry:** `--radius-sm: 12px;`, `--radius-md: 24px;`, `--radius-lg: 32px;`.
- **Depth:** `--shadow-sm: 0 2px 8px rgba(0,0,0,0.04);`, `--shadow-md: 0 12px 24px rgba(0,0,0,0.06);`.
- **Typography:** `--font-main: 'SF Pro Display', 'Inter', -apple-system, sans-serif;`.
2. **Core Layout Logic (CSS Grid):**
- The entire page layout should feel modular.
- **The Bento Grid:** The "Feature Grid" section must use `display: grid` with `grid-template-columns: repeat(4, 1fr)`.
- Use `grid-column: span x` and `grid-row: span y` to create the bento box effect where cards have different sizes (1x1, 2x1, 2x2, 4x2) but fit perfectly together.
- Cards must have `overflow: hidden` to contain inner images/media perfectly.
3. **Advanced Visual Effects:**
- **Frosted Glass:** The Header and floating UI elements must use `backdrop-filter: blur(20px)` and `background: rgba(255, 255, 255, 0.7)`.
- **Squircle Smoothing:** If possible, simulate squircle corners using `clip-path` or standard border-radius with careful anti-aliasing.
- **Micro-Interactions:** On `:hover`, Bento cards should slightly scale (`transform: scale(1.02)`) and shadows should deepen. Text content inside should shift slightly.
- **Subtle Gradients:** Use ultra-subtle, barely-there mesh gradients inside specific cards to break the monotony of white.
4. **Scroll-Driven Animations:**
- Use `animation-timeline: view()` with a simple reveal animation.
- As the user scrolls, the Bento cards should stagger in (translate Y + opacity fade) for a premium feel.
5. **Custom Scrollbar (Minimalist):**
- Target `::-webkit-scrollbar`.
- Width: `8px`.
- Track: Transparent.
- Thumb: A rounded pill shape, colored `--text-secondary` with `opacity: 0.5`, mimicking the native macOS scrollbar behavior.
6. **Section Details:**
- **Hero:** A split layout. Large text on the left, and a "Mini Bento" visual on the right representing the workspace interface.
- **Metrics:** A horizontal scrollable bento row or a dense 4-column grid displaying big numbers.
- **Pricing:** Three cards. The "Pro" card should have a soft, colorful border or shadow glow to stand out, maintaining the clean aesthetic.