Trust & Authority demo
Trust & Authority

A polished, credibility-driven landing page style with clean layouts and authoritative messaging designed for marketing conversion and lead generation.
Category: Corporate & SaaS
Era: 2020s Modern
Prompt: 8.1 KB · 1097 words
# System Prompt: Trust & Authority Landing Page — Build Specification

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

**Theme:** Trust & Authority — a trust-focused corporate/SaaS landing page.
**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**
* All styling lives in a dedicated `style.css` file. **Forbidden:** the `style="..."` attribute anywhere in HTML.
* Target all design properties, layout rules, and states via class/ID selectors only.
* HTML stays semantic and styling-agnostic: changing the look requires editing only CSS, never markup.

**1.2 CSS Variables & Theme Tokens**
Define all tokens in `:root` and theme classes:
* **Colors:** `--primary` (professional blue), `--secondary` (slate grey), `--bg-primary`, `--bg-secondary`, `--text-primary`, `--text-secondary`, `--text-success`, `--text-error`, `--border-default`, `--border-success`, `--border-error`. Add `--accent-gold` and `--accent-silver` for certification badges, and `--bg-highlight` for metric showcase cards.
* **Contrast Pairing:** Every light background token pairs with a dark text token and vice versa — enforced in both light and dark themes.
* **Light Mode Background:** Do not use pure white; use a professional off-white (e.g., `#f7f9fc`) fitting the corporate mood. Use `#fefefe` where a near-white surface is required.
* **Radius & Shadows:** `--radius-sm`, `--radius-md`, `--radius-lg`, `--shadow-sm`, `--shadow-md`.
* **Spacing & Transitions:** `--spacing-gap`, `--transition-fast`, `--transition-normal`, `--ease-standard`.
* **Stacking:** `--z-dropdown`, `--z-modal`, `--z-toast` to prevent overlap conflicts (FAQ accordions, sticky nav, theme toggle).

**1.3 Mandatory Dark Mode**
* Provide dark tokens under `@media (prefers-color-scheme: dark)` **and** a `.dark` class selector.
* Theme switching must swap variables only — no HTML restructuring.
* Persist choice via `localStorage`, falling back to `prefers-color-scheme` on first visit. Include a visible toggle button with correct `aria-pressed` and `aria-label` states ("Toggle dark mode").
* Both themes must maintain trust-appropriate contrast (deep navy backgrounds, light text in dark mode).

**1.4 Flexbox Layout & Mobile-First Alignment**
* Build all layout structures with Flexbox (`display: flex`).
* Every flex container defaults to `align-items: center` unless an explicitly justified exception exists (document any exception in a CSS comment).
* All layouts are mobile-responsive out of the box: multi-column sections (Features, Pricing, How It Works) collapse to single-column stacks 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`). All utilities must map back to CSS variables or generic reusable classes (`.btn`, `.card`, `.badge`, `.metric-card`, `.pricing-tier`, `.faq-item`).

**1.6 Typography & Icons — Google Only**
* **Text:** Load Google Fonts (e.g., Inter for body, a confident display weight for headings) via `<link>`/`@import`; bind to `--font-base`.
* **Icons:** Use Google Material Symbols exclusively — shield icons, lock icons, verified/checkmark icons, award icons. **Forbidden:** raw inline SVGs or local icon files.

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## 2. COMPONENT DESIGN SPECIFICATIONS

**2.1 Buttons**
All states via CSS classes:
* **Default:** `display: flex; align-items: center; justify-content: center; gap: 0.5rem;` minimum 44×44px touch target.
* **Hover:** Brightness/shadow shift, `cursor: pointer`.
* **Focus:** Distinct focus ring using CSS variables for keyboard navigation.
* **Active:** `transform: scale(0.97)` click feedback.
* **Loading:** Interactions disabled, double-clicks prevented, CSS spinner or animated Google Icon — button dimensions must not distort.
* **Disabled:** `opacity: 0.5`, greyscale, `cursor: not-allowed`.
* **Success/Error:** Temporary feedback states driven by `--text-success` / `--text-error`.
* **Danger:** `.btn-danger` visually distinct in both themes (used for any destructive action).

**2.2 Cards (Feature cards, Testimonial cards, Pricing tiers)**
* **Default:** Flexible Flexbox layout, subtle borders and elevation using `--bg-secondary` and variables.
* **Hover:** Elevation shift or `transform: translateY(-2px)`.
* **Focus-within:** Card border highlights when a child link/button receives focus.
* **Skeleton:** Shimmer animation defined in CSS (no layout jumps) for any lazily revealed content.
* **Empty State:** Structured fallback with a Google Icon and guidance text where content is absent.

**2.3 Forms & Inputs (Final CTA email capture, FAQ search if included)**
* **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 Modal / Popup (FAQ detail or pricing comparison if triggered)**
* **States:** Opening, Open, Loading, Success/Error, Closing — all via CSS transitions.
* **UX:** Centered flex container, backdrop overlay, Google Icon close button, keyboard focus trapping, close via `Esc` or overlay click.

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## 3. CORE UX & MICRO-INTERACTION RULES

* **Responsive by Default:** Fluid sizing, standard breakpoints, zero horizontal overflow.
* **Smooth Animations:** `transition: var(--transition-normal)` on all state changes; respect `prefers-reduced-motion`.
* **Accessibility:** Sufficient contrast in both themes; never rely on color alone to communicate state; semantic HTML5 (`<header>`, `<main>`, `<section>`, `<footer>`, `<nav>`); correct ARIA roles/labels on the theme toggle, FAQ accordions (`aria-expanded`, `aria-controls`), and any carousel; logical focus order; full keyboard operability; `aria-live` regions for form feedback and loading states.
* **Mandatory Visual Feedback:** Every click, hover, and submission triggers a visible state change.
* **Theme-Specific Effects (required):**
  * **Badge hover effects** on certification/compliance badges (GDPR, SOC 2, ISO 27001) — subtle lift + gold/silver accent glow.
  * **Metric pulse animations** on case-study stat cards (e.g., "99.99% uptime", "500+ enterprise clients") — gentle pulse, disabled under `prefers-reduced-motion`.
  * **Certificate carousel** for awards/industry recognition — scrollable badge strip with proper ARIA labeling and keyboard-accessible controls.
  * **Smooth stat reveal** — metrics count up / fade in on scroll using IntersectionObserver.
* **Trust Elements:** Shield and lock Google Icons for security indicators, guarantee badges, expert credential chips, before/after comparison styling using `--text-success` for the "after" column.

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## 4. DELIVERABLE & OUTPUT FORMAT

* **Files:** Separate `index.html`, `style.css`, `script.js`. No inline `<script>` beyond a single deferred entry-point reference.
* **Naming:** One consistent convention (BEM or a fixed utility set) across the entire deliverable — never mix conventions.
* **Content:** Write realistic, professional English copy for a corporate/SaaS trust platform (e.g., compliance automation, enterprise security). No lorem ipsum — all sections have real labels, metrics, testimonials, and FAQ answers.
* **Section Content Requirements:**
  * **Hero:** Headline, subheadline, primary CTA, secondary CTA, trust badge row (compliance logos), supporting metric.
  * **Features:** 3 cards, each with a Google Icon, title, description.
  * **How It Works:** 3 numbered steps in a flex row → column on mobile.
  * **Testimonials:** 3+ cards with quote, name, role, credential badge.
  * **Pricing:** 3 tiers, middle tier highlighted ("Most Popular"), each with CTA button.
  * **FAQ:** Accessible accordion, 5+ real questions.
  * **Final CTA:** Email capture form with full input states and `aria-live` feedback.
  * **Footer:** Secondary links (Product, Company, Legal, Compliance), copyright, security badges.