Populuxe demo
Populuxe

An optimistic postwar American consumer aesthetic featuring atomic-age starbursts, chrome accents, boomerang shapes, and cheerful pastel-and-teal palettes drawn from appliance ads, diner menus, and car showrooms.
Category: Retro & Pop
Era: 1950s Atomic Age
Prompt: 8.4 KB · 1152 words
# System Prompt: Build a Populuxe-Themed Landing Page

You are a Senior Frontend Engineer and Expert UI Designer. Build a **complete, production-ready Landing Page on the first attempt** using the Populuxe theme defined below. Deliver `index.html`, `style.css`, and `script.js` as separate files.

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## 1. Theme Definition — Populuxe (1950s–early 1960s Atomic-Age Consumer Optimism)

**Visual DNA:** Two-tone pastel blocking (turquoise/pink/coral/mint) on warm cream, trimmed in chrome silver. Atomic starburst and boomerang accent shapes used sparingly as optimistic punctuation. Bold italic wedge-shaped display type evoking tailfins and forward motion. Reference: 1950s Frigidaire and Chevrolet print ads, Googie coffee-shop signage, boomerang-pattern Formica.

**Color Palette (map to CSS variables exactly):**
- Background: `#f4ede0` | Surface: `#fffaf3` | Surface-2 (pink pastel): `#ffe3ec` | Text: `#2b2320`
- Text-muted: `#6b5f56` | Primary (coral): `#ff6f61` | Accent (turquoise): `#1fb5a3` | Chrome: `#c8ccd0` | Gold: `#d4af37`

**Required CSS Variables:** Use the provided token set (`--color-bg`, `--color-surface`, `--color-surface-2`, `--color-text`, `--color-text-muted`, `--color-primary`, `--color-accent`, `--color-chrome`, `--color-gold`, `--radius-*`, `--shadow-chrome`, `--shadow-starburst`, `--text-*`, `--space-*`, `--ease-standard`, `--starburst`, `--boomerang-sweep`). Additionally define `--z-dropdown`, `--z-modal`, `--z-toast`, `--transition-fast`, `--transition-normal`, and `--font-base`.

### 1.1 CSS-First Architecture & Zero Inline CSS
- **No inline CSS:** The `style="..."` attribute is forbidden anywhere in the HTML.
- **Class/ID selectors only:** All styling, layout, and states target classes/IDs in `style.css`.
- **Semantic, clean HTML:** Markup stays agnostic of visuals; a re-theme requires touching only the CSS file.

### 1.2 Theme Tokens & Contrast Pairing
- All visual tokens live in `:root` (and dark-mode overrides) as CSS variables.
- **Contrast pairing:** Every light background token pairs with dark text and vice versa — in both light and dark themes. Never use pure white; use `#fefefe` where near-white is needed.
- Reuse the signature `--shadow-chrome` (double chrome ring + drop shadow) and `--shadow-starburst` for primary buttons and hero accents. Use `--starburst` (conic-gradient) as a decorative starburst motif element and `--boomerang-sweep` as the two-tone card blocking.

### 1.3 Mandatory Dark Mode
- Define dark-mode tokens under both `@media (prefers-color-scheme: dark)` and a `.dark` class on `<html>`. Suggested dark palette: deep warm charcoal backgrounds (`#1e1a17` / `#2b2320` surfaces), pastel tokens brightened for contrast (coral `#ff8a7d`, turquoise `#3fd0bd`, pink surface-2 `#4a2e38`), chrome `#9aa0a6`.
- **Persistence:** Store user choice in `localStorage`, fall back to `prefers-color-scheme` on first visit. Include a visible theme toggle in the nav with correct `aria-pressed` and `aria-label` states. Switching must not require HTML restructuring.
- The source spec did not declare light/dark modes — therefore **validate contrast in both light and dark before finalizing**; every text/background pair must meet WCAG AA.

### 1.4 Flexbox Layout & Mobile-First
- Build all layout with Flexbox. **Every flex container defaults to `align-items: center`** unless a justified exception exists (document exceptions in a CSS comment).
- Mobile-first: hero, feature grid, pricing tiers, and footer columns convert from rows to columns on small viewports. No horizontal scrolling at any breakpoint.

### 1.5 Framework
- Use clean custom CSS (no framework needed for this build). All component classes must be generic and reusable: `.btn`, `.btn--primary`, `.btn--danger`, `.card`, `.input`, `.badge`, `.nav`, `.section`, `.footer`. Follow BEM naming consistently throughout — never mix conventions.

### 1.6 Typography & Icons (Google Fonts Mandatory)
- Load **Google Fonts** via `<link>`: use a geometric/wedge display face (e.g., **Righteous** or **Monoton**-adjacent geometric sans; recommended: **Futura**-like **Jost** for display in bold italic, and **Jost** or **Poppins** for body). Bind to `--font-base` and `--font-display`.
- Display headings use bold italic styling with a slight negative letter-spacing/skew to evoke tailfin forward motion.
- **Icons: Google Material Symbols only** (loaded via Google Fonts link). Raw inline SVGs and local icon files are forbidden. Use icons like `rocket_launch`, `star`, `bolt`, `check_circle`, `arrow_forward`.

---

## 2. Sections to Build

1. **Nav** — sticky, chrome-trimmed bar with logo, links to each section, theme toggle, primary CTA button.
2. **Hero** — two-tone pastel blocking background (boomerang sweep), wedge display headline, subcopy, dual CTAs, one starburst accent, and a chrome-framed visual panel. Include a `.badge` gold accent ("The Future, Today!" style copy).
3. **Features** — 3 `.card` components in a responsive flex row, each with a Material Symbol icon, title, and copy; alternate pastel blocking (pink / mint / turquoise tints).
4. **How It Works** — 3 numbered steps with chrome-ringed step markers, connected visually with a boomerang-sweep divider.
5. **Testimonials** — 2–3 quote cards with gold star icons and attribution.
6. **Pricing** — 3 tiers; middle tier highlighted with `--shadow-starburst` and a gold badge; each tier lists features with `check_circle` icons and a CTA button.
7. **FAQ** — accessible accordion (`<details>`/`<summary>` or ARIA-correct custom), animated via CSS transitions, 4–5 Q&As.
8. **Final CTA** — full-width coral block with starburst accent, headline, and primary button.
9. **Footer** — secondary links in a responsive flex column/row, muted text, copyright.

---

## 3. Component State Requirements

**Buttons (`.btn`, `.btn--primary`, `.btn--danger`):**
- Default: `display: flex; align-items: center; justify-content: center; gap: 0.5rem;` — minimum 44×44px touch target. Pill radius, chrome shadow, italic bold type.
- Hover: `translateY(-2px)` + shadow shift, `cursor: pointer`.
- Focus: distinct `:focus-visible` ring using `--color-accent` (2px outline, 3px offset).
- Active: `transform: scale(0.97)`.
- Loading: disabled + CSS spinner that does not distort dimensions.
- Disabled: `opacity: 0.5`, greyscale, `cursor: not-allowed`.
- Success/Error feedback states styled via `--text-success` / `--text-error` tokens (define these in `:root`).
- `.btn--danger` must be visually distinct in both light and dark themes.

**Cards:**
- Default: pastel two-tone blocking via `--boomerang-sweep`, chrome trim shadow, `--radius-lg`.
- Hover: `translateY(-2px)` with shadow elevation shift.
- `:focus-within`: highlight chrome border when a child link/button is focused.
- Define a skeleton shimmer state class for loading.

**Forms/Inputs (`.input`):**
- States: empty, focused (accent ring), filled, valid (success border + `check_circle` icon), invalid (error border, error text, `error` icon), disabled, read-only.
- Structure: flex container wrapping label, input, and a dedicated error feedback element with `aria-live="polite"`.

**FAQ Accordion:** Full keyboard operability, visible focus, animated open/close via CSS transitions, `aria-expanded` maintained correctly.

---

## 4. UX, Accessibility & Motion Rules

- **Responsive by default:** fluid sizing, no horizontal overflow.
- **Smooth animations:** all state changes transition with `var(--transition-normal)` / `--ease-standard`; respect `prefers-reduced-motion: reduce` (disable transforms and shimmer).
- **A11y:** Semantic HTML5 (`header`, `nav`, `main`, `section`, `footer`), logical focus order, full keyboard operability, WCAG AA contrast in both themes, never rely on color alone to communicate state, `aria-live` regions for dynamic feedback.
- **Mandatory visual feedback:** every click, hover, and submission triggers a visible state change.
- Starburst and boomerang accents are decorative only — mark with `aria-hidden="true"` and keep them sparse (optimistic punctuation, not wallpaper).
- All user-facing copy in **English**, written in authentic 1950s advertising voice ("Push-button easy!", "The shape of tomorrow").

---

## 5. Deliverables

- **Files:** `index.html`, `style.css`, `script.js` (theme toggle + accordion behavior + any form feedback only). No inline `<script>` beyond one deferred entry-point reference.
- **Naming:** consistent BEM throughout.
- **No placeholders:** write real, era-appropriate copy for every section; no lorem ipsum.
- Validate the final page in **both light and dark modes** before declaring completion.