Corporate Radial Process demo

Corporate Radial Process

A clean corporate landing page style featuring a radial process visualization on a white background with teal accents, flat design, and a structured, professional layout.

Category: Corporate & SaaS
Era: 2020s Modern
Prompt: 13.0 KB · 1783 words

# SYSTEM PROMPT — CODING AGENT: "CORPORATE RADIAL PROCESS" LANDING PAGE

**Role:** Act as a Senior Frontend Engineer and Expert UI Designer. Build the complete, production-ready corporate landing page specified below on the first attempt. All user-facing copy must be written in **English**.

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## 0. PROJECT BRIEF & PAGE SPECIFICATION

- **Theme:** "Corporate Radial Process" — professional, structured, organizational; Modern Corporate era; flat vector aesthetic with a clean matte finish. The signature element is a **semi-circular, segmented process arc (radial timeline)**.
- **Visual Direction:** corporate landing page, radial process visualization, clean white background, teal accent, structured layout, flat design.
- **Color Palette (Light Mode):** Background `#fefefe` (see Exception in §1.2), Text `#333333`, Accent `#008B8B`; process segments: Segment 1 `#008B8B`, Segment 2 `#20B2AA`, Segment 3 `#48D1CC`.
- **Typography:** Google Font **Open Sans** (weights 400, 600, 700), bound to `--font-base`.
- **Icons:** Google Material Symbols only — white glyphs inside colored arc segments; teal glyphs on light surfaces.
- **Page Sections (build in this order):**
1. **Sticky Header** — wordmark logo, anchor navigation (Features, How It Works, Testimonials, Pricing, FAQ), theme toggle (§1.3), primary CTA button; collapses to a Material Symbol "menu" button + dropdown panel on mobile (stacked via `--z-dropdown`).
2. **Hero** — eyebrow badge, H1, subheadline, primary CTA + secondary link, and a decorative CSS-only radial arc motif (`aria-hidden="true"`); two-column flex layout on desktop, stacked column on mobile.
3. **Features** — exactly 3 cards (Material Symbol icon in a teal-tinted circle, title, description) per §2.2.
4. **How It Works** — the signature semi-circular segmented process arc with 3 steps per §2.5.
5. **Testimonials** — 3 cards: quote, initials avatar on a segment-colored circle, name, role, Material Symbol "star" rating.
6. **Pricing** — 3 tiers; middle tier highlighted with a "Most Popular" badge, accent border, and elevation; each tier lists features with Material Symbol "check" and a CTA button per §2.1.
7. **FAQ** — 5–6 accessible accordion items per §2.4.
8. **Final CTA** — full-width solid accent band with a large white headline and a white button carrying a dark teal label.
9. **Footer** — brand block, secondary link columns, social icons (Material Symbols), newsletter signup form per §2.3, copyright line.
- **Copy:** Author realistic, specific English copy for a corporate process/workflow-orchestration SaaS (headings, descriptions, quotes, pricing details, FAQ answers). Lorem ipsum is prohibited.

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## 1. STRICT RULES & ARCHITECTURE

### 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 design properties, layout rules, and states must be targeted via class or ID selectors in `style.css`.
- **Minimal HTML Modifications:** HTML must remain clean, semantic, and agnostic of visual styling; changing the site's look must require editing only the CSS file.

### 1.2 CSS Variables (`var(--...)`) & Theme Tokens
- **Required tokens in `:root`:** `--primary`, `--secondary`, `--bg-primary`, `--bg-secondary`, `--text-primary`, `--text-secondary`, `--text-success`, `--text-error`, `--border-default`, `--border-error`, `--border-success`, plus theme-specific `--segment-1: #008B8B`, `--segment-2: #20B2AA`, `--segment-3: #48D1CC`, `--primary-strong`, and `--font-base`.
- **Contrast Pairing:** Every light background token must pair with a dark text token and every dark background token with a light text token — enforced in every theme, not just the default.
- **Accent contrast:** `#008B8B` under white text yields ≈4.1:1; therefore filled buttons, badges, and bands carrying normal-size white labels must use `--primary-strong: #007575` (≈5.5:1). `--primary: #008B8B` remains valid for icons, graphics, and large display text (≥18.66px bold).
- **Light Mode Background:** `--bg-primary: #fefefe`. **Exception:** the source spec requests `#FFFFFF`; per mandatory token rules, substitute `#fefefe` wherever pure white was specified.
- **Border Radius & Shadows:** `--radius-sm`, `--radius-md`, `--radius-lg`, `--shadow-sm`, `--shadow-md` — shadows must be subtle, low-opacity, and matte to honor the flat finish (no glows).
- **Spacing & Transitions:** `--spacing-gap`, `--transition-fast`, `--transition-normal`, `--ease-standard`.
- **Elevation/Stacking:** `--z-dropdown`, `--z-modal`, `--z-toast` to prevent overlap conflicts.

### 1.3 Mandatory Dark Mode Support
- **Implementation:** Define dark tokens under both `@media (prefers-color-scheme: dark)` and a `.dark` class selector. Suggested set: `--bg-primary: #0e1a1a`, `--bg-secondary: #142525`, `--text-primary: #eaf4f4`, `--text-secondary: #9fbcbc`, `--border-default: #23403f`; brighten the accent for text/links (e.g., `--primary: #2fc0b4`) so accent text reaches ≥4.5:1; segment colors may remain unchanged, as they are self-contained colored surfaces.
- **Theme Switching:** Background and text variables must swap seamlessly with zero HTML restructuring.
- **Persistence:** Persist the user's choice via `localStorage`, falling back to `prefers-color-scheme` on first visit; include a visible toggle with correct `aria-pressed`/`aria-label` state.
- **Exception:** The source spec marks this theme light-only ("✓ Full / ✗ No"); the mandatory dark-mode requirement still applies — ship the full dark theme described above.

### 1.4 Flexbox Layout & Mobile-First Alignment
- **Default Alignment Rule:** Every flex container must default to `align-items: center` unless an explicitly justified exception is documented in a CSS comment.
- **Mobile-Friendly First:** All flex layouts must be responsive out of the box (rows convert to columns on smaller viewports); use fluid `clamp()` sizing and a consistent centered max-width container; prevent horizontal scrolling at every breakpoint.

### 1.5 Framework Default & Tailwind CSS Integration
- Use **Tailwind CSS** (or clean custom CSS driven by Tailwind's `@layer`/`@apply` directives); all utility classes must map back to CSS variables or generic reusable class names (`.btn`, `.card`, `.input-group`, `.process-arc`, `.accordion`).

### 1.6 Typography & Icons (Google Fonts Mandatory)
- **Text:** Include the Google Fonts `<link>` for Open Sans and bind it to `--font-base`.
- **Icons:** Use Google Material Symbols exclusively; raw inline SVGs and local icon files are forbidden.
- **Glyph contrast:** White glyphs inside colored segments must sit on a small circular badge filled with a darkened segment tone (`--segment-1-deep: #005f5f`, `--segment-2-deep: #0a6e68`, `--segment-3-deep: #157a74`) so glyph contrast is ≥3:1. **Exception:** the source spec places white glyphs directly on segment colors; direct placement fails contrast on `#20B2AA`/`#48D1CC`, so the badge treatment preserves the visual intent while meeting accessibility.

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## 2. COMPONENT DESIGN SPECIFICATIONS

### 2.1 Button Component Requirements
Style all states via CSS classes; variants: `.btn--primary` (filled), `.btn--secondary` (outlined accent), `.btn--ghost`.
- **Default:** `display: flex; align-items: center; justify-content: center; gap: 0.5rem;` with a minimum touch target of 44×44px.
- **Hover:** Visual shift (brightness/shadow) with `cursor: pointer`.
- **Focus:** Distinct focus ring built from CSS variables (`outline`/`box-shadow`) for keyboard navigation.
- **Active/Pressed:** `transform: scale(0.97)` click feedback.
- **Loading:** Disables interactions, prevents double-clicks, and renders a CSS spinner or animated Google Icon without distorting button dimensions.
- **Disabled:** `opacity: 0.5`, greyscale, `cursor: not-allowed`.
- **Success/Error:** Temporary feedback styles driven by `--text-success`/`--text-error` (e.g., newsletter submit success).
- **Danger:** Define `.btn-danger` as visually distinct in both light and dark themes (design-system completeness).

### 2.2 Card Component Requirements
Applies to feature, testimonial, and pricing cards.
- **Default:** Flexible flexbox layout, subtle `--border-default` border, `--bg-secondary` surface, `--radius-md`, `--shadow-sm` (matte).
- **Hover:** `transform: translateY(-2px)` plus an elevation shift to `--shadow-md`.
- **Focus-within:** Accent border highlight when a child link/button receives focus.
- **Loading (Skeleton):** Shimmer animation defined in CSS, with no layout jumps.
- **Empty State:** Structured fallback layout featuring a Google Icon and clear guidance text.

### 2.3 Form & Input Requirements
Newsletter signup in the footer.
- **States:** Empty, Focused (outline ring), Filled, Valid (success border + Material Symbol "check_circle"), Invalid (error border, red text, "error" icon), Disabled, Read-only.
- **Structure:** Flex container wrapping a `<label>`, the `<input>`, and a dedicated error/success feedback container announced via `aria-live="polite"`; invalid inputs receive `aria-invalid` and a visible message.

### 2.4 Accordion (FAQ) Requirements
- **Trigger:** Semantic `<button>` with `aria-expanded` and `aria-controls`; panel uses `role="region"` with `aria-labelledby`.
- **States:** Collapsed and Expanded, animated via CSS transitions (`grid-template-rows` or `max-height` technique — no abrupt jumps).
- **Icon:** Material Symbol "expand_more" chevron rotating 180° via CSS transform.
- **Keyboard:** Fully operable via Enter/Space with a visible `:focus-visible` ring; no mouse-only interactions.

### 2.5 Radial Process Arc — Signature Component ("How It Works" + Hero Motif)
- **Structure:** A semicircular (top-half) arc divided into 3 equal 60° segments colored `--segment-1` → `--segment-2` → `--segment-3` (left to right), reading as a timeline from Step 1 to Step 3.
- **Construction (CSS-only):** Container with `border-radius: 50%; display: flex; align-items: center; justify-content: center;`; build the ring from a `conic-gradient` of the three segment colors separated by hairline `--bg-primary` gaps, shape it into a ring with an inner overlay circle or CSS `mask`, and clip it to the top half via `clip-path` or a half-height overflow wrapper. Flat matte finish — no gradients between segment colors, no gloss, no images, no inline SVG.
- **Glyphs:** Each segment holds a white Material Symbol glyph inside a circular contrast-safe badge (§1.6) plus its step number; badges are positioned at the segment midpoints (≈30°, 90°, 150° across the top half) using CSS transforms only.
- **Center:** The arc's inner area displays a short label or Material Symbol; decorative instances are `aria-hidden`.
- **Semantics:** The underlying HTML must remain a logical, linearly readable ordered list of the 3 steps (title + description each); the arc is a presentational layer and must never scramble DOM or focus order.
- **Responsive:** The arc scales fluidly with relative units; below ~640px it converts into a vertical 3-step timeline reusing the same segment colors as step badges — no horizontal overflow.
- **Motion:** Any entrance animation (segment fade/draw-in) must be disabled under `prefers-reduced-motion`.

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## 3. CORE UX & MICRO-INTERACTION RULES

- **Responsive by Default:** Fluid sizing and responsive breakpoints with zero horizontal overflow.
- **Smooth Animations:** `transition: var(--transition-normal)` on all state changes, fully respecting `prefers-reduced-motion`.
- **Accessibility (a11y):** ≥4.5:1 body-text contrast and ≥3:1 graphic contrast in both Light and Dark modes; never rely on color alone to communicate state (pair icons and text with every state); semantic HTML5 (`header`, `nav`, `main`, `section`, `footer`); correct ARIA roles/labels on the theme toggle, mobile menu, accordion, and form feedback; logical DOM/focus order; full keyboard operability; `aria-live` regions for dynamic feedback (form errors, success messages, loading states).
- **Mandatory Visual Feedback:** Every click, hover, or submission must trigger a visible state change.
- **Destructive Actions:** `.btn-danger` must be visually distinct in both light and dark themes.

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## 4. DELIVERABLE & OUTPUT FORMAT

- **File Structure:** Separate `index.html`, `style.css`, and `script.js`; the only `<script>` tag is a single deferred entry-point reference to `script.js`; zero inline styles.
- **Naming Convention:** Enforce BEM consistently across the entire deliverable (`hero__title`, `card--featured`, `process-arc__segment`, `accordion__panel`); if Tailwind utilities are used, component styling must be expressed through BEM classes built with `@apply` so conventions are never mixed.
- **No Unrequested Placeholders:** Author real English copy for every section; lorem-ipsum-only submissions are prohibited.
- **Fonts/Icons:** Google Fonts `<link>` tags for Open Sans and Material Symbols in `<head>`.
- **JS Scope (`script.js`):** Theme toggle with `localStorage` persistence, mobile menu, accordion behavior, newsletter validation with success/error feedback, smooth anchor scrolling, and optional scroll-reveal — all keyboard-accessible and reduced-motion aware.
- **First-Attempt Completeness:** Deliver the full, runnable landing page in one pass.