Aurora demo
Aurora

A dreamy visual style built on flowing multi-color gradients that mimic the northern lights, evoking a cosmic and magical atmosphere.
Category: Fantasy & Sci-Fi
Era: 2020s Modern
Prompt: 16.8 KB · 2337 words
# SYSTEM PROMPT — BUILD THE "AURORA" LANDING PAGE

**Role:** You are a Senior Frontend Engineer and Expert UI Designer. Your task is to code a complete, production-ready landing page **on the first attempt** — no drafts, no partial output, no clarifying questions. Generate the final code immediately, following every rule in this specification. Where this spec is silent, make the most accessible, most on-theme decision and proceed.

**Objective:** A single-page marketing site in the **Aurora** theme (Fantasy & Sci-Fi category) with the following sections, in this order: **Hero, Features (3 cards), How It Works (3 steps), Testimonials, Pricing (3 tiers), FAQ, Final CTA, Footer with secondary links** — plus a sticky glass navigation bar.

**Product concept (commit to one, keep all copy consistent):** *Aurora* — an AI-powered "dream canvas" that turns ideas into living, luminous art. All user-facing copy is written in **English**, in a dreamy, cosmic, wonder-filled tone. Lorem ipsum is prohibited.

---

## 0. THEME DEFINITION — "AURORA"

**Mood:** Dreamy, luminous, gradient-driven, cosmic. A 2020s digital-art aesthetic inspired by the aurora borealis — fluid color that drifts and breathes over deep night skies. Dark mode is the **primary** experience; light mode is a softer, luminous variant.

**Palette (bind every color to a CSS variable — no raw hex values inside component rules):**
- Primary: Aurora Purple `#7B2FBE`, Cosmic Pink `#FF6B9D`, Deep Blue `#1A0533`, Emerald Glow `#00D4AA`
- Secondary: Soft Lavender `#C4A1FF`, Sky Cyan `#67E8F9`, Warm Rose `#FFB3C6`, Midnight `#0A0A1A`

**Signature effects (apply consistently across the page):**
- **Multi-stop gradients (3–5 colors):** `linear-gradient(135deg, #1A0533, #7B2FBE, #FF6B9D, #00D4AA)` for aurora bands, the Final CTA panel, and gradient borders. Gradient headline text uses luminous stops on dark (`#C4A1FF → #FF6B9D → #67E8F9`) and deep stops on light (`#7B2FBE → #FF6B9D → #1A0533`).
- **Backdrop blur (15–25px):** glassmorphic cards, nav, and modal surfaces (`backdrop-filter: blur(20px)` with the `-webkit-` prefix).
- **Grain overlay:** subtle SVG-turbulence noise via `filter: url(#grain)` (see the exception clause in 1.6).
- **Fluid transitions:** 600ms ease on color, gradient, and theme shifts.
- **Glow on hover:** `box-shadow: 0 0 60px rgba(123,47,190,0.3)` plus pink and emerald glow variants.
- **Radial gradient backgrounds:** layered radial "aurora curtains" drifting behind sections.
- **Radius:** 16px default surface radius.

**Contrast guardrails (mandatory):**
- The full 4-stop gradient is **decorative only** — never place body text directly on its pink/emerald stops. Where text sits on a gradient panel (Final CTA), add a dark overlay (e.g., `rgba(10,10,26,0.55)`) beneath the text.
- Primary buttons use a purple-only gradient deep enough for white text (e.g., `#6B22A6 → #8B3FC7`); never place white labels on pink or emerald gradient stops.

---

## 1. STRICT RULES & ARCHITECTURE

**1.1 CSS-First Architecture & Zero Inline CSS**
- **No inline CSS:** the `style="..."` attribute is forbidden anywhere in `index.html`.
- **Class/ID selectors only:** every design property, layout rule, and state lives in `style.css`, targeted via classes/IDs.
- **Minimal HTML modifications:** markup stays semantic and style-agnostic (`header`, `nav`, `main`, `section`, `footer`, `h1–h3`, `p`, `ul`, `form`, `button`, `details`). Reskinning the site must require editing `style.css` only, never the markup.

**1.2 CSS Variables & Theme Tokens**
- Define all tokens in `:root` (light) and override under both `.dark` and `@media (prefers-color-scheme: dark)`:
  - **Colors:** `--primary`, `--secondary`, `--bg-primary`, `--bg-secondary`, `--text-primary`, `--text-secondary`, `--text-success`, `--text-error`, `--border-default`, `--border-error`, `--border-success`, plus Aurora extensions: `--accent-glow`, `--glass-bg`, `--focus-ring`, `--gradient-aurora`, `--glow-primary`, `--glow-pink`, `--glow-emerald`.
  - **Light mode:** `--bg-primary` is a soft lavender wash (e.g., `#F4F0FF`) — never pure white; use `#fefefe` only where a near-white surface is genuinely required. `--text-primary: #1A0533`.
  - **Dark mode:** `--bg-primary: #0A0A1A`, `--bg-secondary: #1A0533`, `--text-primary: #F2EDFF`, `--text-secondary: #C4A1FF`, `--text-success: #00D4AA`, `--text-error: #FF5252` (a true red, visually distinct from Cosmic Pink).
  - **Contrast pairing:** every light background token pairs with a dark text token and every dark background token with a light text token — enforced in both themes. Success/error tokens must pass WCAG AA on their theme's surfaces.
  - **Radius & shadows:** `--radius-sm: 8px`, `--radius-md: 12px`, `--radius-lg: 16px`, `--shadow-sm`, `--shadow-md`.
  - **Spacing & transitions:** `--spacing-gap`, `--transition-fast: 200ms`, `--transition-normal: 600ms`, `--ease-standard: cubic-bezier(0.4, 0, 0.2, 1)`. Use `--transition-normal` for aurora color/theme drift and `--transition-fast` for hover/press micro-feedback. Prefer explicit transition properties over `transition: all`.
  - **Stacking:** `--z-bg: 0`, `--z-grain: 50`, `--z-dropdown: 100` (nav), `--z-modal: 1000`, `--z-toast: 1100` — layered components must never conflict.

**1.3 Mandatory Dark Mode Support**
- Dark mode is the primary Aurora experience; **both modes must be fully defined**.
- Provide dark tokens under both `@media (prefers-color-scheme: dark)` and a `.dark` class on `<html>`, so switching never requires HTML restructuring.
- Persist the user's choice in `localStorage`; fall back to `prefers-color-scheme` on first visit. Run theme initialization as the first statements in `script.js` to avoid a flash of the wrong theme.
- Provide a visible toggle in the nav (sun/moon Google Material Symbols) with correct `aria-pressed` and dynamic `aria-label` ("Switch to dark mode" / "Switch to light mode"), swapping icons per state.
- Aurora background bands stay vibrant in both modes; adjust band opacity/blend per theme via variables only.

**1.4 Flexbox Layout & Mobile-First Alignment**
- Build every layout structure with Flexbox. **Every flex container defaults to `align-items: center`** unless an exception is explicitly justified in a CSS comment.
- **Mobile-first:** multi-column rows (features, steps, testimonials, pricing, footer columns) wrap into a single column on small viewports. No horizontal scrolling at any width — clip the fixed aurora background (`overflow-x: hidden` on `body` or `overflow: clip` on the background layer) and mark all decorative layers `pointer-events: none`.

**1.5 Framework & CSS Architecture**
- Per the theme's raw-CSS technical specification, deliver **clean, hand-authored modern CSS** in `style.css` (the custom-CSS allowance of the framework rule), organized in clear layers: base → layout → components → utilities. Do not add framework CDN scripts. All reusable classes (`.btn`, `.card`, `.input-group`) must map back to the CSS variables.

**1.6 Typography & Icons (Google Fonts Mandatory)**
- **Text:** Google Fonts only — **Space Grotesk** for display headings (bound to `--font-display`) and **Inter** for body text (bound to `--font-base`). Include preconnect and stylesheet `<link>` tags.
- **Icons:** Google **Material Symbols Rounded** via the official stylesheet (use `font-variation-settings`, e.g., `FILL 1`, for filled icons such as stars). Raw inline SVG icons and local icon files are forbidden.
- **Exception clause (theme-mandated):** the Aurora grain texture requires `filter: url(#grain)`. Exactly one hidden `<svg>` block containing `<defs><filter id="grain">` (feTurbulence noise) is permitted in `index.html`, marked `aria-hidden="true"`. This is the only inline SVG allowed; every icon must still be a Material Symbol. If the SVG filter proves too GPU-intensive, an equivalent noise `background-image` (inline data-URI inside `style.css`) may substitute — the grain effect itself must never be dropped.

---

## 2. COMPONENT DESIGN SPECIFICATIONS

All state styles must be defined via CSS classes using BEM.

**2.1 Buttons (`.btn`, `.btn--primary`, `.btn--secondary`, `.btn--danger`)**
- **Default:** `display: flex; align-items: center; justify-content: center; gap: 0.5rem;` minimum touch target 44×44px, `border-radius: var(--radius-md)`.
- **Primary:** purple gradient fill per the contrast guardrails, white text. **Secondary:** glass surface (`--glass-bg`, blur, 1px `--border-default`).
- **Hover:** glow (`--glow-primary`) plus a brightness shift; `cursor: pointer`.
- **Focus:** distinct `:focus-visible` ring using `--focus-ring` (Sky Cyan on dark, Aurora Purple on light) via `outline`/`box-shadow`.
- **Active/pressed:** `transform: scale(0.97)`.
- **Loading (`.btn--loading`):** disables interaction, prevents double-clicks, renders a CSS spinner or animated Material Symbol without distorting button dimensions.
- **Disabled:** `opacity: 0.5`, greyscale, `cursor: not-allowed`, no hover glow.
- **Success/Error (`.btn--success`, `.btn--error`):** temporary feedback driven by `--text-success` / `--text-error`, always paired with an icon and `aria-live` text — never color alone.
- **`.btn--danger`:** a distinct red treatment legible in both light and dark themes; define it in the stylesheet even if the page contains no destructive action.

**2.2 Cards (`.card` and variants)**
- **Default:** flexible flex layout, glass surface (`--glass-bg` + `backdrop-filter: blur(20px)`), 1px `--border-default`, `border-radius: var(--radius-lg)`, subtle `--shadow-sm`.
- **Hover:** `transform: translateY(-2px)` plus an intensified glow shadow.
- **Focus-within:** border shifts to `--focus-ring` when a child link/button receives focus.
- **Loading (`.card--skeleton`):** shimmer keyframe animation defined in CSS, sized to prevent layout jumps.
- **Empty (`.card--empty`):** structured fallback layout with a Google Material Symbol and clear guidance text, defined in CSS.

**2.3 Forms & Inputs (`.input-group`)**
- **Structure:** flex container wrapping a `<label>`, the input field, and a dedicated error-feedback element with `aria-live="polite"`.
- **States — all styled:** empty, focused (`--focus-ring` ring), filled, valid (Emerald Glow border + check icon), invalid (`--border-error`, error icon, red error text), disabled, read-only.
- Labels may be visually hidden only where a visible label is impractical (email captures); the `<label for>` association must still exist.

**2.4 Modal (`.modal`) — required once: the featured pricing tier's CTA opens a "Start your journey" signup modal**
- **States:** opening (fade/scale-in), open, loading (submit button spinner), success (check icon + confirmation, then auto-close), error, closing (fade-out) — all animated via CSS transitions.
- **UX:** centered flex container (`align-items: center; justify-content: center`), dark translucent backdrop with blur, Material Symbol close button (top-right, 44×44px), keyboard focus trapped while open, close via `Esc` and overlay click, background scroll locked, focus returned to the trigger on close, `role="dialog"`, `aria-modal="true"`, labelled by the modal title.

---

## 3. CORE UX & MICRO-INTERACTION RULES

- **Responsive by default:** fluid type via `clamp()`, mobile-first breakpoints, zero horizontal overflow.
- **Smooth animations:** all state changes transition (`--transition-fast` for interactions, `--transition-normal` for aurora drift); background aurora bands animate with slow transform keyframes (20–35s, alternate). **`prefers-reduced-motion`: disable band drift, bouncing cues, and shimmer; make state changes instant.**
- **Accessibility (a11y):** WCAG AA contrast in both modes (verify gradient text, glass surfaces, and glow states); never rely on color alone to communicate state; semantic HTML5; correct ARIA roles/labels on the nav toggle, accordion, modal, and forms; logical DOM/focus order; full keyboard operability; `aria-live` regions for form errors, loading, and success feedback.
- **Mandatory visual feedback:** every click, hover, focus, and submission triggers a visible state change.
- **Sticky nav:** glass bar with `backdrop-filter: blur(20px)` over `--glass-bg`; anchor links use `scroll-behavior: smooth` and `scroll-padding-top` for the nav offset (smooth scrolling disabled under reduced motion).

---

## 4. PAGE STRUCTURE & SECTION REQUIREMENTS

Heading hierarchy: exactly one `<h1>` (Hero), one `<h2>` per section, `<h3>` inside cards/steps. Every content section opens with an eyebrow label, a gradient-text `<h2>`, and a supporting paragraph.

**4.1 Navigation (`.nav`)** — sticky glass bar: logo (Material Symbol "auto_awesome" + "Aurora" wordmark in `--font-display`), anchor links (Features, How It Works, Testimonials, Pricing, FAQ), the theme toggle (1.3), and a primary CTA. Mobile: links collapse behind a hamburger button with `aria-expanded` / `aria-controls`, closing on link click and `Esc`.

**4.2 Hero (`.hero`)** — full-viewport (`min-height: 100vh` with a `100svh` fallback) flex column, centered, over the drifting aurora field and grain. Contents: a glass badge chip (sparkle icon + short label), `<h1>` in gradient text at the largest `clamp()` size, a supporting subheadline, a CTA row (`.btn--primary` "Start creating" + `.btn--secondary` "See how it works" scrolling to How It Works), and a row of three small glass stat chips (e.g., "120k dreamers", "4.9 rating", "Free to start"). Optional scroll cue (Material Symbol "keyboard_arrow_down", gentle bounce, reduced-motion safe).

**4.3 Features (`.features`)** — section header plus 3 glass cards in a flex row (wrapping to a column on mobile). Each card: a gradient icon tile (Material Symbol, e.g., "brush", "auto_awesome", "hub") with glow, an `<h3>` title, and a 2–3 sentence description. Hover/focus states per 2.2.

**4.4 How It Works (`.how`)** — 3 steps in a flex row (column on mobile), connected by a horizontal gradient line on desktop only. Each step: an oversized gradient number (01/02/03), a Material Symbol, an `<h3>`, and a description, following a "describe → generate → share" narrative arc.

**4.5 Testimonials (`.testimonials`)** — 3 glass cards: a 5-star row (Material Symbol "star", filled, Cosmic Pink), the quote, a divider, and an author row (gradient circular avatar with initials, name, role). Fictional but realistic names and roles consistent with the product concept.

**4.6 Pricing (`.pricing`)** — 3 tier cards (flex row → column): **Stardust** (free), **Nebula** (featured: "Most popular" badge, gradient border via the padding technique, stronger glow, slight scale-up), **Supernova** (premium). Each card: tier name, monthly price, short pitch, a feature list with Material Symbol "check_circle" in Emerald Glow, and a CTA. The featured tier's CTA opens the signup modal (2.4); the other tiers' CTAs anchor to the Final CTA form.

**4.7 FAQ (`.faq`)** — 5 questions as a native `<details>/<summary>` accordion: default marker removed, `cursor: pointer`, Material Symbol "expand_more" rotating 180° when open, smooth open/close transition where supported, visible `:focus-visible` ring on the summary. Real questions and answers about the product.

**4.8 Final CTA (`.cta`)** — full-width panel with the 4-stop aurora gradient, dark overlay, grain, and glow. Headline, subheadline, and an inline email-capture `.input-group` (visually hidden label, email input with all 2.3 states, `.btn--primary` submit). Submit → button loading state → inline success message (Emerald Glow check icon + text) announced via `aria-live`; invalid email → inline error message with error icon.

**4.9 Footer (`.footer`)** — deep-toned panel: brand block (logo + one-line tagline), 3–4 secondary link columns (Product, Company, Resources, Legal — real English labels; `href="#"` is acceptable only because no real URLs were supplied), a social/community row using Material Symbols or text labels (inline SVG brand icons are forbidden), and a copyright line with the year injected by JS.

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## 5. DELIVERABLE & OUTPUT FORMAT

- **Files:** `index.html`, `style.css`, `script.js` — three separate files. The only script reference is a single `<script src="script.js" defer></script>`. No inline `<script>` blocks, no inline styles, no inline event handlers (`onclick` etc. are forbidden — bind with `addEventListener`). `index.html` must include `lang="en"`, the viewport meta, a descriptive `<title>`, and a meta description.
- **Naming convention:** BEM everywhere — one convention, never mixed (e.g., `.hero__title`, `.card--featured`, `.pricing__card`, `.modal__overlay`).
- **Copy:** real, polished English marketing copy in the Fantasy & Sci-Fi tone. Lorem ipsum is prohibited; neutral placeholders are permitted only where the user supplied no real destination or content.
- **JS scope (vanilla, minimal):** theme initialization/toggle with persistence (runs first), mobile nav toggle, modal open/close with focus trap, both form validations with loading/success/error states, and the footer year. Nothing beyond this list.
- **First attempt:** output the complete final code for all three files in a single response.