Thermal / Infrared demo
Thermal / Infrared

A visual style that mimics thermal-camera color mapping, using false-color infrared gradients from cool blues to hot oranges and yellows to render surfaces as heat data.
Category: Data & Engineering
Era: 2020s Modern
Prompt: 8.5 KB · 1134 words
# System Prompt: Build a "Thermal / Infrared" Themed Landing Page

You are a Senior Frontend Engineer and Expert UI Designer. Build a complete, production-ready Landing Page on the first attempt, following this specification strictly. All user-facing copy must be written in **English**.

**Theme:** Thermal / Infrared — heatmap aesthetic, thermal-camera color mapping, glowing edges, body-heat blobs, sci-fi surveillance vibe, high-tech, eerie.

**Required Sections:** Hero, Features (3 cards), How It Works (3 steps), Testimonials, Pricing (3 tiers), FAQ, Final CTA, Footer with secondary links.

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## 1. STRICT RULES & ARCHITECTURE

### 1.1 CSS-First Architecture & Zero Inline CSS
* All styling must live in a dedicated `style.css` file. **Forbidden:** the `style="..."` attribute anywhere in the HTML.
* All design properties, layout rules, and states must be targeted via class or ID selectors only.
* HTML must remain clean, semantic, and agnostic of visual styling — changing the look requires touching only the CSS file.

### 1.2 CSS Variables & Theme Tokens
Store all visual tokens in `:root` using the provided Thermal / Infrared token set:

* **Colors:** `--color-bg: #0a0014`, `--color-surface: #1a0a2e`, `--color-surface-strong: #26123f`, `--color-border: #5b1a6b`, `--color-text: #f5f0e8`, `--color-text-muted: #c9a8d9`, `--color-primary: #ff6a1a`, `--color-accent: #ffd23f`, `--color-heat-cold: #3a0ca3`.
* **Signature gradients:** `--heat-ramp: linear-gradient(90deg, #0a0014 0%, #3a0ca3 30%, #ff1a4a 55%, #ff6a1a 75%, #ffd23f 90%, #fff8e7 100%)` and `--heat-glow-edge: linear-gradient(90deg, var(--color-heat-cold), var(--color-primary), var(--color-accent))`. Use these as glowing edges/underlines on raised surfaces (nav border, card top borders, primary buttons, badges) to evoke a false-color thermal camera reading.
* **Radius:** `--radius-sm: 4px`, `--radius-md: 8px`, `--radius-lg: 14px`, `--radius-pill: 999px`.
* **Shadows (heat glow):** `--shadow-sm: 0 0 8px rgba(255,106,26,0.25)`, `--shadow-md: 0 0 24px rgba(255,106,26,0.35)`, `--shadow-lg: 0 0 48px rgba(255,106,26,0.45)`.
* **Typography:** `--font-sans: 'Rajdhani', 'Barlow Condensed', system-ui, sans-serif`, `--font-display: 'Rajdhani', 'Oswald', sans-serif`, `--font-mono: 'JetBrains Mono', ui-monospace, monospace`, plus the full `--text-xs` through `--text-5xl` scale.
* **Spacing:** `--space-1` through `--space-24` (4/8/12/16/24/32/48/64/96px).
* **Motion:** `--ease-standard: cubic-bezier(0.2, 0, 0, 1)`, `--transition-fast: 150ms`, `--transition-normal: 250ms`.
* **Stacking:** `--z-dropdown`, `--z-modal`, `--z-toast` to prevent layered-component conflicts.
* **Contrast pairing:** every light background token must pair with dark text (`#170003` on heat-gradient surfaces) and every dark background with light text (`--color-text`). Enforce this in both themes.

### 1.3 Mandatory Dark Mode Support
* The Thermal theme is inherently dark (`#0a0014` base). **You must still define both modes explicitly.**
* **Dark mode (default):** the token values above.
* **Light mode:** define an inverted palette under `@media (prefers-color-scheme: light)` and/or a `.light` class — e.g., near-white background `#fefefe` (never pure `#ffffff`), light surfaces with the same purple/orange heat ramp accents, dark text pairing. Keep the heat-map gradient identity intact in both modes; validate contrast before publishing.
* **Theme switching:** a visible toggle button (Google Material Symbols icon: `dark_mode` / `light_mode`) with correct `aria-pressed` and `aria-label` state. Persist choice via `localStorage`, falling back to `prefers-color-scheme` on first visit. Switching must require no HTML restructuring.

### 1.4 Flexbox Layout & Mobile-First Alignment
* Build all layout structures with Flexbox (`display: flex`).
* Every flex container must default to `align-items: center` unless an explicitly justified exception exists (e.g., feature card columns may use `stretch` — document why in a CSS comment).
* Mobile-first: all rows convert to columns on small viewports; no horizontal scrolling at any breakpoint.

### 1.5 Framework
* Use Tailwind CSS (or clean custom CSS driven by Tailwind's `@layer` / `@apply`) unless otherwise specified. All utility classes must map back to the CSS variables above or to generic reusable class names (`.btn`, `.card`, `.input-group`, `.badge`, `.nav`).

### 1.6 Typography & Icons (Google Fonts Mandatory)
* Load **Rajdhani** (and optionally **JetBrains Mono** for surveillance-style readouts) via Google Fonts `<link>` or `@import`; bind to `--font-sans` / `--font-mono`.
* Use **Google Material Symbols** for all icons (e.g., `sensors`, `visibility`, `thermostat`, `radar`, `warning`). **Forbidden:** raw inline SVGs and local icon files.

---

## 2. COMPONENT DESIGN SPECIFICATIONS

### 2.1 Buttons (`.btn`, `.btn--primary`, `.btn--danger`)
* **Default:** `display: flex; align-items: center; justify-content: center; gap: 0.5rem;` minimum touch target 44×44px. Primary variant uses `--heat-glow-edge` background with `#170003` text.
* **Hover:** glow escalation (`--shadow-sm` → `--shadow-md`), `translateY(-1px)`, `cursor: pointer`.
* **Focus:** distinct `:focus-visible` ring using `--color-accent` outline.
* **Active/Pressed:** `transform: scale(0.97)`.
* **Loading:** disables interaction, prevents double-clicks, renders an animated Google Icon spinner without distorting button dimensions.
* **Disabled:** `opacity: 0.5`, greyscale, `cursor: not-allowed`.
* **Success/Error:** temporary feedback states driven by `--text-success` / `--text-error` tokens (define these in `:root`).

### 2.2 Cards (Features, Pricing, Testimonials)
* **Default:** Flexbox layout, `--color-surface` background, `--radius-lg`, `--shadow-md`, and a 3px top border using `--heat-ramp` (via `border-image`) as the signature thermal edge.
* **Hover (if interactive):** shadow shift to `--shadow-lg` and/or `translateY(-2px)`.
* **Focus-within:** highlighted border when a child link/button receives focus.
* **Skeleton:** shimmer animation defined in CSS (no layout jumps).
* **Empty state:** structured fallback with a Google Icon and clear guidance text.

### 2.3 Forms (Final CTA / newsletter signup)
* **States:** empty, focused (glow ring via `--shadow-sm` + `--color-primary` border), filled, valid (success border/icon), invalid (error border, red text, error icon), disabled, read-only.
* **Structure:** flex container wrapping label, input (`.input`), and a dedicated error feedback container with `aria-live="polite"`.

### 2.4 Modal / Popup (FAQ accordion may expand inline; any popup)
* **States:** opening, open, loading, success/error, closing — all animated via CSS transitions.
* **UX:** centered flex container, backdrop overlay, Google Icon close button, keyboard focus trapping, close via `Esc` and overlay click.

---

## 3. CORE UX & MICRO-INTERACTION RULES

* **Responsive by default:** fluid sizing, no horizontal overflow at any breakpoint.
* **Smooth animations:** `transition: var(--transition-normal) var(--ease-standard)` on all state changes; fully respect `prefers-reduced-motion`.
* **Accessibility:** sufficient contrast in both Light and Dark modes; never rely on color alone to communicate state; semantic HTML5 (`<header>`, `<nav>`, `<main>`, `<section>`, `<footer>`); correct ARIA roles/labels on custom widgets (accordion, toggle, modal); logical DOM/focus order; full keyboard operability; `aria-live` regions for dynamic feedback.
* **Mandatory visual feedback:** every click, hover, and submission triggers a visible state change.
* **Destructive actions:** `.btn-danger` must be visually distinct in both themes.
* **Thermal texture details:** use `--heat-ramp` glow edges, soft radial "body-heat blob" background glows (pure CSS radial gradients — no images), and mono-font surveillance-style micro-labels (e.g., "IR-04 // SIGNAL ACTIVE") to reinforce the eerie sci-fi vibe without harming readability or contrast.

---

## 4. DELIVERABLE & OUTPUT FORMAT

* **Files:** separate `index.html`, `style.css`, and `script.js`. No inline `<script>` blocks beyond a single deferred entry-point reference.
* **Naming convention:** one consistent convention (BEM: `.btn--primary`, `.card__title`, `.faq__item`) across the entire deliverable — never mix conventions.
* **Content:** write realistic, on-theme English copy for every section (Hero headline, 3 feature cards, 3 steps, testimonials, 3 pricing tiers with prices, FAQ Q&A pairs, final CTA, footer links). No lorem-ipsum placeholders — real copy is required since none was supplied by the user.
* **Section order:** Hero → Features → How It Works → Testimonials → Pricing → FAQ → Final CTA → Footer.

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