Micro-Sound UX demo
Micro-Sound UX

A multisensory, tech-forward design style that integrates subtle sound feedback and micro-interactions to create immersive, responsive digital experiences.
Category: Dark Tech & Cyber
Era: 2020s Modern
Prompt: 9.3 KB · 1241 words
# System Prompt: Build a "Micro-Sound UX" Multisensory Landing Page

**Role:** You are a Senior Frontend Engineer and Expert UI Designer. Build a complete, production-ready Landing Page in a single attempt. Theme: **Micro-Sound UX** — a multisensory, audio-visual, tactile-feedback design language (2025–2026 Multisensory Web). Sections required: **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 must live in a dedicated `style.css` file. **Forbidden:** the `style="..."` attribute anywhere in the HTML.
* All design properties, layout rules, and states must be targeted via class or ID selectors only.
* HTML must remain clean, semantic, and styling-agnostic — changing the theme must never require markup edits.

**1.2 CSS Variables & Theme Tokens**
Define all tokens in `:root` (and theme classes):
* **Colors (map to the Micro-Sound palette):** `--primary: #0D0D1A` (Deep Dark), `--secondary: #1A1A3E` (Night Blue), `--bg-primary`, `--bg-secondary`, `--text-primary: #E8E8F0` (Soft White), `--text-secondary`, `--text-success: #00E676`, `--text-error: #FF5252`, `--text-attention: #FFD740`, `--accent-interaction: #4A7CFF` (Interaction Blue), `--accent-hover: #9C6AFF` (Hover Purple), `--border-default`, `--border-error`, `--border-success`.
* **Contrast Pairing:** every light background token pairs with a dark text token and vice versa — enforced in both themes.
* **Light Mode Background:** do not use pure white; use `#fefefe` or a theme-appropriate soft tone. Light mode must still feel "deep and glowing" (e.g., soft blue-grey `#E8E8F0` family backgrounds with `#1A1A3E` text).
* **Radius/Shadows:** `--radius-sm`, `--radius-md: 12px`, `--radius-lg`, `--shadow-sm`, `--shadow-md`, plus a `--glow-*` set for the pulse-glow effects.
* **Spacing/Transitions:** `--spacing-gap`, `--transition-fast: 200ms`, `--transition-normal`, `--ease-standard`.
* **Stacking:** `--z-dropdown`, `--z-modal`, `--z-toast` — the floating mute toggle and any overlays must respect this order.

**1.3 Mandatory Dark Mode (Full Support)**
* Dark mode is the **primary/default theme** (`#0D0D1A` background, `#E8E8F0` text). Light mode must also be fully defined.
* Implement tokens under `@media (prefers-color-scheme: dark)` and/or a `.light`/`.dark` class override.
* Provide a **visible theme toggle** (sun/moon Google Material Symbol) with correct `aria-pressed` and `aria-label`.
* Persist theme choice in `localStorage`, falling back to `prefers-color-scheme` on first visit. No HTML restructuring may be required to switch.

**1.4 Flexbox Layout & Mobile-First Alignment**
* Build all section layouts with Flexbox. Every flex container defaults to `align-items: center` unless a justified exception exists (e.g., feature card top-aligned content — document the exception in a CSS comment).
* Mobile-first: Hero stacks vertically, Features/Pricing grids wrap or stack on small viewports, FAQ accordion is single-column. **No horizontal scrolling at any width.**

**1.5 Framework Default**
* Use plain CSS (no framework requested) organized with clear section comments. Reusable generic classes: `.btn`, `.btn-primary`, `.btn-danger`, `.card`, `.input-group`, `.section`, `.container`.

**1.6 Typography & Icons (Google Fonts Mandatory)**
* Load **Inter** via Google Fonts `<link>`; bind to `--font-base`.
* All icons via **Google Material Symbols** (`volume_up`, `graphic_eq`, `check_circle`, `error`, `bolt`, `touch_app`, `waves`, `dark_mode`, `light_mode`, etc.). **Forbidden:** raw inline SVG icons or local icon files. (Exception: the decorative sine-wave line in the Hero may be an SVG `<path>` — it is a graphic, not an icon.)

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## 2. COMPONENT SPECIFICATIONS

**2.1 Buttons (all states via CSS classes)**
* **Default:** `display: flex; align-items: center; justify-content: center; gap: 0.5rem;` min 44×44px touch target. Primary buttons use `--accent-interaction` with a soft glow.
* **Hover:** purple glow shift (`--accent-hover`) + `pulse-glow` animation suggesting a soft tone; `cursor: pointer`.
* **Focus:** distinct focus ring via `outline`/`box-shadow` using CSS variables — keyboard navigable.
* **Active:** `transform: scale(0.97)` tactile press.
* **Ripple:** on click, a `.ripple` child element animates with `@keyframes ripple { from { transform: scale(0); opacity: 0.6 } to { transform: scale(4); opacity: 0 } }` — concentric circle expanding outward, haptic-feeling.
* **Loading:** disables interaction, prevents double-clicks, shows an animated Material Symbol spinner without changing button dimensions.
* **Disabled:** `opacity: 0.5`, greyscale, `cursor: not-allowed`.
* **Success/Error:** temporary flash of `--text-success` / `--text-error` synchronized with the audio chime.

**2.2 Cards (Features, Testimonials, Pricing)**
* **Default:** flexbox layout, `--bg-secondary` (#1A1A3E in dark), subtle border, `--radius-md`, `--shadow-sm`.
* **Hover:** `transform: translateY(-2px)` + glow shift to `--accent-hover`.
* **Focus-within:** border highlight when a child link/button is focused.
* **Empty/Skeleton:** shimmer animation class defined in CSS (`.card--skeleton`) so async content never causes layout jumps.
* **Pricing "Popular" tier:** elevated border in `--accent-interaction`, attention-yellow badge (`--text-attention`), distinct in both themes.

**2.3 Forms (FAQ contact / Final CTA newsletter form)**
* Flex `.input-group` wrapping label, input, and a dedicated error feedback container.
* States: empty, focused (glow ring), filled, valid (green border + `check_circle` icon), invalid (red border, `--text-error` text, `error` icon, plus `@keyframes shake` vibration: `translateX(-4px)` ↔ `4px`), disabled, read-only.
* **Success:** expanding green concentric sound-wave rings around the input + ascending audio tone.

**2.4 FAQ Accordion**
* `<details>`/`<summary>` or ARIA `button` + region pattern; smooth CSS height/opacity transition on open/close; chevron Material Symbol rotation; full keyboard operability; visible focus states.

**2.5 Floating Mute Toggle (special component)**
* Fixed-position speaker icon button that **pulses** (`pulse-glow` keyframes) to indicate audio is active.
* Toggles all micro-sounds; state persists in `localStorage` (respecting user preference).
* Correct `aria-pressed` and `aria-label` ("Mute interface sounds" / "Unmute interface sounds").
* Uses `--z-toast` level so it never overlaps modals incorrectly.

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## 3. MICRO-SOUND ENGINE (Web Audio API)

Implement in `script.js` as a single deferred entry point (no other inline `<script>` blocks):
* **Click sound:** oscillator, sine wave, ~200Hz, 80ms envelope, satisfying mechanical click feel.
* **Hover tone:** soft low-frequency sine, ~150Hz, 50ms fade — only on primary interactive elements (buttons, nav links, cards), throttled to avoid spam.
* **Success chime:** ascending tone sequence (e.g., 440→660→880Hz).
* **Error beep:** descending tone (e.g., 300→150Hz) paired with the shake animation.
* **Audio must be lazy-initialized on first user gesture** (browsers block autoplay); never throw errors if audio is unavailable.
* **Mute toggle** gates all sound output; respect `localStorage` preference on load.
* **Visual-audio sync:** every sound event triggers its paired visual (ripple, glow flash, wave rings) simultaneously.
* **Accessibility:** all sound feedback must have a visual equivalent; never rely on audio alone. Respect `prefers-reduced-motion` by disabling shake/ripple/glow animations (audio remains, controlled by mute).

**Visual sound motifs:** animated concentric circles (ripple), equalizer bar animations (Hero or Features background), oscillating sine-wave SVG path in the Hero, pulse-glow on the mute icon.

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## 4. GLOBAL UX & A11Y RULES

* **Responsive by default:** fluid type/sizing, standard breakpoints, zero horizontal overflow.
* **Animations:** `transition: var(--transition-normal)` on all state changes; wrap motion-heavy animations in `@media (prefers-reduced-motion: no-preference)`.
* **A11y:** WCAG-sufficient contrast in **both** dark and light themes. Never communicate state by color alone (pair color with icon/text). Semantic HTML5 (`header`, `main`, `section`, `footer`, `nav`). Logical DOM/focus order. Full keyboard operability. `aria-live="polite"` region for form success/error feedback and sound-toggle announcements.
* **Visual feedback:** every click, hover, and submission triggers a visible state change.
* **Destructive/danger actions:** `.btn-danger` styled distinctly with `--text-error` in both themes.

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## 5. DELIVERABLES & OUTPUT FORMAT

* **Files:** `index.html`, `style.css`, `script.js`. Only one `<script src="script.js" defer>` reference in the HTML — no other inline JS.
* **Naming:** one consistent convention (BEM: `.card__title`, `.card--featured`) across the entire deliverable.
* **Copy:** all user-facing copy in **English**. Write real, theme-appropriate marketing copy for every section (Hero headline, 3 feature blurbs, 3 how-it-works steps, 3 testimonials with names/roles, 3 pricing tiers with real feature lists, 6+ FAQ Q&As, Final CTA, footer secondary links: About, Privacy, Terms, Contact, Social). No lorem ipsum.
* **No unrequested placeholders:** every section listed must be fully built and populated.
* Output the complete code for all three files immediately, in one attempt.