**Role:** You are a Lead Frontend Engineer specializing in **Developer Experience (DX)** design. You build interfaces that feel "engineered" rather than just "designed." You prefer semantic HTML and robust CSS variables over heavy frameworks.
**Task:** Build a landing page for "VOICE_KIT" using the **Modern Technical** aesthetic.
**[CONFIGURATION]**
- **[STYLE_NAME]:** Modern Technical / DevTools
- **[INDUSTRY]:** AI API
- **[PROJECT_NAME]:** VOICE_KIT
- **[TECH_STACK]:** HTML5 + Native CSS3 (Scoped Variables).
- **[PAGE_STRUCTURE]:** Navbar, Hero (w/ Code Block), Features, Performance, Pricing, Footer.
**Technical Requirements:**
1. **Global Variables (`:root`):**
- **Industrial Palette:**
* `--bg-body: #EAEAE8;` (The signature concrete grey).
* `--bg-card: #F6F6F5;` (Slightly lighter panels).
* `--text-main: #333333;`
* `--text-mono: #555555;`
* `--accent-orange: #F2542D;` (Safety Orange).
* `--border-color: #d1d1d1;`
- **Fonts:**
* `--font-mono: 'Roboto Mono', 'Fira Code', monospace;` (Use for Headings AND Code).
* `--font-sans: 'Inter', system-ui, sans-serif;` (Use for Body text).
- **Radius:** `--radius-sm: 4px;` (Sharp, technical look).
2. **Visual Effects (The "DevTools" Look):**
- **Monospace Headers:** Apply `font-family: var(--font-mono)` to all `<h1>`, `<h2>`, and `<h3>`. Reduce letter-spacing slightly (`-0.03em`).
- **The Code Window:** Create a `.code-block` container:
* Background: `#1a1a1a` (Dark mode contrast).
* Header: Mac-style window dots (Red, Yellow, Green).
* Syntax Highlighting: Use `<span>` classes to manually color keywords (e.g., `.kwd { color: #c678dd }`, `.str { color: #98c379 }`).
- **Subtle Borders:** All cards must have `border: 1px solid var(--border-color)`.
- **Pulsing Badge:** Create a "Live Status" dot using `@keyframes pulse` to indicate system uptime or new versions.
3. **Layout Strategy:**
- **Container:** `max-width: 1200px`.
- **Grid:** Use `display: grid` with `gap: 24px` for feature cards.
- **Sticky Header:** Use `backdrop-filter: blur(8px)` on the sticky navigation bar.
4. **Specific Components:**
- **Hero:** Split screen. Left: Value prop. Right: The Code Window.
- **Latency Graph:** Create horizontal bars using CSS `width: %`. Animate them growing on load.
- **Pricing:** "Pay-as-you-go" style. Simple cards with large monospace numbers (`$0.015`).