Split Pastel demo
Split Pastel

A playful, friendly landing page style featuring split pastel color backgrounds with a modern, approachable aesthetic suited for creative apps and lifestyle brands.
Category: Playful & Youth
Era: 2020s Modern
Prompt: 9.0 KB · 1222 words
# System Prompt: Build "Split Pastel" 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 exactly. Output the final code immediately — no explanations, no placeholders.

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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. The `style="..."` attribute is forbidden in HTML.
* Target all design properties, layout rules, and states via class or ID selectors only.
* Keep HTML semantic and clean; changing the site's look must require modifying only `style.css`, never the markup.

**1.2 CSS Variables & Theme Tokens**
Define all tokens in `:root`:

* **Colors (Split Pastel palette):** `--primary: #f5e6dc` (peach), `--secondary: #e4dff0` (lavender), `--bg-primary`, `--bg-secondary`, `--text-primary: #1a1a1a`, `--text-secondary`, `--text-success`, `--text-error`, `--border-default`, `--border-error`, `--border-success`, `--badge-mint: #c8f0d8`, `--badge-yellow: #f0f0c8`, `--badge-pink: #f0d4e0`, `--white: #fefefe`.
* **Contrast Pairing:** Every light background token must pair with dark text (`#1a1a1a`); never place light-on-light or dark-on-dark. Use `#1a1a1a` text on all pastel backgrounds.
* **Light Mode Background:** Do not use pure white `#ffffff`; use `#fefefe` where a near-white surface is needed.
* **Shape & Depth:** `--radius-sm`, `--radius-md`, `--radius-lg: 24px` (generous rounded corners fit the playful theme), `--shadow-sm`, `--shadow-md`.
* **Spacing & Motion:** `--spacing-gap`, `--transition-fast`, `--transition-normal: 250ms`, `--ease-standard: cubic-bezier(0.4, 0, 0.2, 1)`.
* **Stacking:** `--z-dropdown`, `--z-modal`, `--z-toast`.

**1.3 Dark Mode — Theme Override**
* The source spec requests "Full Light / No Dark." **Exception clause:** per platform rules, Dark Mode support is mandatory. Implement it as a soft dark variant of the palette (muted peach/lavender-tinted dark surfaces, e.g. `#2a2430` and `#241f28` backgrounds with light pastel text) so the split-pastel identity survives in dark mode.
* Provide dark tokens under `@media (prefers-color-scheme: dark)` **and** a `.dark` class on `<html>`.
* Include a visible theme toggle button with correct `aria-pressed` and `aria-label` ("Toggle dark mode").
* Persist user choice via `localStorage`; fall back to `prefers-color-scheme` on first visit. No HTML restructuring may be required to switch themes.

**1.4 Flexbox Layout & Mobile-First Alignment**
* Build every layout structure with Flexbox (`display: flex`).
* Every flex container defaults to `align-items: center` unless an explicitly justified exception is documented in a CSS comment.
* Mobile-first: the split hero stacks to a single column under 768px; feature/pricing/testimonial rows wrap or stack on small viewports. No horizontal scrolling at any breakpoint.

**1.5 Framework Default**
* Use Tailwind CSS via CDN, or clean custom CSS organized with `@layer` / `@apply`-style utilities. All utility classes must map back to the CSS variables or generic reusable class names (`.btn`, `.card`, `.badge`, `.section`).

**1.6 Typography & Icons (Google Fonts Mandatory)**
* Load **Outfit** from Google Fonts (`<link>` or `@import`): weights 400/500 for body, 700/800 for display headings. Bind to `--font-base`.
* Icons: **Google Material Symbols** only. Raw inline SVGs and local icon files are forbidden.

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## 2. COMPONENT DESIGN SPECIFICATIONS

**2.1 Button Component (`.btn`, `.btn-primary`, `.btn-secondary`, `.btn-danger`)**
* **Default:** `display: flex; align-items: center; justify-content: center; gap: 0.5rem;` minimum touch target 44x44px. Primary CTA: fully rounded (`border-radius: 999px`), peach or dark fill per contrast rules.
* **Hover:** brightness/shadow shift, `cursor: pointer`.
* **Focus:** distinct focus ring via `outline` using CSS variables for keyboard navigation.
* **Active/Pressed:** `transform: scale(0.97)`.
* **Loading:** disables interaction, prevents double-clicks, renders an animated Google Icon or CSS spinner without distorting button dimensions.
* **Disabled:** `opacity: 0.5`, greyscale, `cursor: not-allowed`.
* **Success/Error:** temporary feedback states driven by `--text-success` / `--text-error`.

**2.2 Card Component (`.card`) — Features, Steps, Testimonials, Pricing**
* **Default:** Flexbox layout, subtle border + `--shadow-sm`, surface `--bg-secondary` or `#fefefe`, `--radius-lg` corners.
* **Hover:** `transform: translateY(-2px)` with shadow elevation.
* **Focus-within:** highlighted border when a child link/button receives focus.
* **Loading (Skeleton):** shimmer animation defined in CSS to prevent layout jumps.
* **Empty State:** structured fallback with a Google Icon and guidance text.

**2.3 Form & Input (FAQ search, Final CTA email capture)**
* **States:** empty, focused (outline ring), filled, valid (success border/icon), invalid (error border, red text, error icon), disabled, read-only.
* **Structure:** flex container wrapping label, input, and a dedicated error feedback container.

**2.4 FAQ Accordion & Modal/Popup Behavior**
* FAQ items: `<details>`/`<summary>` or ARIA-compliant custom accordion — keyboard operable, animated open/close via CSS transitions, Google Icon chevron that rotates.
* Any modal (e.g., plan comparison): opening/open/loading/success/closing states animated via CSS; centered flex container (`align-items: center`), backdrop overlay, Google Icon close button, focus trapping, closes on `Esc` and overlay click.

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## 3. CORE UX & MICRO-INTERACTION RULES

* **Responsive by default:** fluid sizing, no horizontal overflow at any width.
* **Smooth animations:** `transition: var(--transition-normal)` (250ms) on all state changes; respect `prefers-reduced-motion`.
* **Accessibility:** sufficient contrast in light **and** dark modes; never rely on color alone to communicate state; semantic HTML5; correct ARIA roles/labels; logical focus order; full keyboard operability; `aria-live` regions for form feedback and toasts.
* **Mandatory visual feedback:** every click, hover, and submission triggers a visible state change.
* **Destructive actions:** `.btn-danger` visually distinct in both themes.

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## 4. SPLIT PASTEL THEME IMPLEMENTATION

* **Split Hero Background:** `.split-left { background: #f5e6dc }` (peach), `.split-right { background: #e4dff0 }` (lavender) — a full-viewport hero split vertically 50/50 on desktop, stacked on mobile. In dark mode, use the dark-tinted equivalents.
* **Grid Pattern Overlay:** `.grid-overlay { background-image: linear-gradient(rgba(0,0,0,0.03) 1px, transparent 1px), linear-gradient(90deg, rgba(0,0,0,0.03) 1px, transparent 1px); background-size: 20px 20px; }` applied to the right (lavender) hero panel.
* **Badge Pills:** `.badge { display: inline-flex; align-items: center; gap: 6px; padding: 6px 14px; border-radius: 20px; font-size: 0.85rem; }` with variants `.badge-mint { background: #c8f0d8 }`, `.badge-yellow { background: #f0f0c8 }`, `.badge-pink { background: #f0d4e0 }` — each badge includes a small Google Material Symbol icon and dark text `#1a1a1a`. Scatter badges playfully across hero, features, and pricing sections.
* **Rounded CTA:** all primary CTAs use `border-radius: 999px`.
* **Tone:** Playful & Youth — friendly microcopy, generous whitespace, rounded everything, approachable energy. All user-facing copy in **English**.

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## 5. REQUIRED SECTIONS (in order)

1. **Header/Nav:** logo, nav links, theme toggle, primary CTA. Mobile: collapses to a column flex menu.
2. **Hero:** split peach/lavender background with grid overlay on right panel, headline (Outfit 800), subheadline, two CTAs, decorative badge pills.
3. **Features:** 3 cards with Google Icons, badges, hover elevation.
4. **How It Works:** 3 numbered steps in cards, connected visually with flex layout.
5. **Testimonials:** 3 quote cards with avatar placeholders (initials circles, no external images), names and roles.
6. **Pricing:** 3 tiers; middle tier highlighted with a "Most Popular" badge pill; each with feature list and CTA button.
7. **FAQ:** accordion, 5–6 real questions with real answers (no lorem ipsum).
8. **Final CTA:** centered flex section with email capture form (valid/invalid states, `aria-live` feedback) and rounded CTA.
9. **Footer:** brand, secondary links (About, Privacy, Terms, Contact), social icon links (Google Icons), copyright.

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## 6. DELIVERABLE & OUTPUT FORMAT

* **Files:** `index.html`, `style.css`, `script.js` — separate files. No inline `<script>` blocks beyond a single deferred entry-point reference.
* **Naming:** one consistent convention (BEM or a fixed utility set) across the entire deliverable — never mix conventions.
* **No unrequested placeholders:** write real, theme-appropriate English copy for a playful/creative product (e.g., a design-tool or creative-workspace brand). Lorem ipsum is forbidden.
* **JS scope:** theme toggle + persistence, FAQ accordion, form validation feedback, mobile menu, and any modal logic only. No frameworks.

Output the complete `index.html`, `style.css`, and `script.js` now.