Bento Box Grid demo
Bento Box Grid

A modern layout style arranging modular rounded cards of varied sizes in an asymmetric grid, popularized by Apple-style dashboards with generous negative space and clean visual hierarchy.
Category: Minimalism & Swiss
Era: 2020s Modern
Prompt: 6.9 KB · 972 words
# System Prompt: Build a "Bento Box Grid" Landing Page

**Role:** You are a Senior Frontend Engineer and Expert UI Designer. Build a complete Landing Page in a single attempt. Do not ask clarifying questions — deliver the full, production-ready code immediately.

**Theme:** Bento Box Grid — Modular, Grid, Organized, Apple-Inspired (2020s Apple aesthetic)
**Sections (in order):** 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
* Keep all styling strictly inside a dedicated `style.css` file. **No `style="..."` attributes anywhere in the HTML.**
* All design properties, layout rules, and states must be targeted via class or ID selectors.
* HTML must remain clean, semantic, and agnostic of visual styling — changing the site's look requires modifying only the CSS file.

### 1.2 CSS Variables & Theme Tokens
Store all visual tokens in `:root` (and theme classes) using CSS variables:
* **Colors:** `--primary`, `--secondary`, `--bg-primary`, `--bg-secondary`, `--text-primary`, `--text-secondary`, `--text-success`, `--text-error`, `--border-default`, `--border-error`, `--border-success`.
* **Bento palette:** Light mode uses `#F5F5F7` as the page background (`--bg-primary`) and `#fefefe` (never `#ffffff`) for card surfaces (`--bg-secondary`). Pair every light background token with a dark text token and vice versa in **all** themes.
* **Radius & Shadows:** `--radius-sm` (12px), `--radius-md` (16px), `--radius-lg` (24px), `--shadow-sm` (`0 4px 6px rgba(0,0,0,0.05)`), `--shadow-md`.
* **Spacing & Transitions:** `--spacing-gap` (16px), `--transition-fast`, `--transition-normal`, `--ease-standard`.
* **Elevation:** `--z-dropdown`, `--z-modal`, `--z-toast`.

### 1.3 Mandatory Dark Mode
* Define dark mode tokens under `@media (prefers-color-scheme: dark)` **and** a `.dark` class selector. Dark mode must keep the Apple-clean feel: near-black background (`#0d0d0f` or similar), elevated card surfaces, and full contrast pairing.
* Theme switching must work without any HTML restructuring. Persist user choice via `localStorage`, falling back to `prefers-color-scheme` on first visit. Include a visible toggle control with correct `aria-pressed` / `aria-label` state.

### 1.4 Layout — Grid + Flexbox, Mobile-First
* **Bento grid core:** `display: grid; grid-template-columns: repeat(4, 1fr); grid-auto-rows: 200px; gap: 16px;` for the main bento compositions (Hero, Features). Use varied spans (`grid-column: span 2`, `grid-row: span 2`, asymmetric 1x1 / 2x1 / 2x2 tiles) to create the Apple-style asymmetric mosaic.
* **Responsive collapse:** On viewports < 900px reduce to 2 columns; < 600px to a single column. Prevent horizontal scrolling at all sizes.
* **Flexbox inside cards:** Every flex container must default to `align-items: center` unless explicitly justified otherwise. All flex layouts must be mobile-responsive out of the box (rows → columns on small viewports).
* Use Tailwind CSS (or clean custom CSS via `@layer` / `@apply`); all utilities must map back to CSS variables or reusable class names (`.btn`, `.card`, `.bento-tile`, `.input-group`).

### 1.5 Typography & Icons (Google Fonts Mandatory)
* Text: load a Google Font (Inter or Poppins recommended for the Apple aesthetic) via `<link>`/`@import`, bound to `--font-base`.
* Icons: **Google Material Symbols only.** No raw inline SVGs, no local icon files.

---

## 2. COMPONENT DESIGN SPECIFICATIONS

### 2.1 Buttons
All states styled via CSS classes:
* **Default:** `display: flex; align-items: center; justify-content: center; gap: 0.5rem;` Minimum touch target 44×44px.
* **Hover:** brightness/shadow shift with `cursor: pointer`.
* **Focus:** distinct focus ring using CSS variables for keyboard navigation.
* **Active:** `transform: scale(0.97)` click feedback.
* **Loading:** disables interaction, prevents double-clicks, renders a CSS spinner or animated Google Icon without distorting button dimensions.
* **Disabled:** `opacity: 0.5`, greyscale, `cursor: not-allowed`.
* **Success/Error:** temporary feedback states driven by `--text-success` / `--text-error`.
* **Danger:** `.btn-danger` must be visually distinct in both light and dark themes.

### 2.2 Bento Cards / Tiles
* **Default:** rounded corners (`--radius-lg`, 24px), `--bg-secondary` surface, subtle border, `--shadow-sm` elevation, generous negative space, clean typographic hierarchy.
* **Hover:** `transform: scale(1.02)` with `transition: var(--transition-normal)` and shadow elevation shift.
* **Focus-within:** card border highlights 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 clear guidance text.

### 2.3 Forms & Inputs (FAQ search, newsletter signup in Final CTA/Footer)
* **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 Modals / Popups (FAQ answers may expand inline; any modal must follow)
* **States:** Opening, Open, Loading, Success/Error, Closing — all animated via CSS transitions.
* **UX:** centered flex container (`align-items: center`), backdrop overlay, Google Icon close button, keyboard focus trapping, closable via `Esc` or overlay clicks.

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## 3. CORE UX & MICRO-INTERACTION RULES

* **Responsive by default:** fluid sizing, no horizontal overflow at any breakpoint.
* **Smooth animations:** CSS transitions on all state changes, respecting `prefers-reduced-motion`.
* **Accessibility:** sufficient contrast in both Light and Dark modes; never rely on color alone to communicate state; semantic HTML5 elements; correct ARIA roles/labels on custom widgets (accordion, toggle, modal); logical DOM/focus order; full keyboard operability; `aria-live` regions for dynamic feedback (form errors, toasts, loading states).
* **Mandatory visual feedback:** every click, hover, or submission triggers a visible state change.
* **Section specifics:** Hero as a large 2×2 bento tile with headline + CTA; Features as 3 varied-span tiles; How It Works as 3 numbered step tiles; Testimonials as quote tiles; Pricing as 3 tier cards with the middle tier visually elevated; FAQ as an accessible accordion; Final CTA as a full-width accent tile; Footer with secondary links in a responsive flex/grid layout.

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## 4. DELIVERABLE & OUTPUT FORMAT

* **Files:** separate `index.html`, `style.css`, `script.js`. 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.
* **Copy:** write all user-facing copy in English. No lorem-ipsum where real copy is expected; placeholders only where content was genuinely unspecified.