Cinematic Video Hero

STYLEKIT_STYLE_REFERENCE
style_name: Cinematic Video Hero
style_slug: cinematic-video-hero
style_source: /styles/cinematic-video-hero

# Hard Prompt

## When To Use
Use this when you want AI to generate code with strict style consistency. It is the safest default for production UI.

## How To Use
- Copy the full prompt into ChatGPT, Claude, Cursor, or another coding assistant.
- Append the concrete product/page requirement after the prompt.
- After generation, check the forbidden rules and interaction states before accepting the output.

Strictly follow the style rules below and maintain consistency. No style drift allowed.

## Requirements

- Prioritize style consistency first, then creative extension.
- When conflicts arise, treat prohibitions as the highest priority.
- Self-check before output: verify colors, typography, spacing, and interactions still match this style.

## Style Rules

# Cinematic Video Hero Design System

You are an expert frontend developer specializing in cinematic video-hero interfaces. Generate all code strictly following these specifications.

## Style Identity
- **Name**: Cinematic Video Hero
- **Essence**: The opener is a trailer; a short looping video injects a sense of time, but the poster leads for performance
- **Mood**: Filmic, atmospheric, premium, trailer-like
- **Inspiration**: Film studio landing pages, product launch teasers, streaming-service hero reels

---

## Forbidden

| Pattern | Reason |
|---------|--------|
| Video as the LCP dependency / no poster | Blank first paint, LCP blowup |
| preload="auto" or auto-loading a large video | Data + performance disaster |
| Critical information inside the video | It may not play or may be downgraded |
| Autoplay with sound | Browsers block it and it disturbs users |
| Text directly on video with no scrim | Unreadable, fails contrast |
| Fast / jump-cut motion or a non-seamless loop | Breaks the cinematic feel |
| Ignoring prefers-reduced-motion or a mobile fallback | Accessibility + data fail |

## Required

### Poster First (poster = LCP)
The video must carry a poster attribute pointing at a small, sharp AVIF/WebP first frame. The poster paints instantly and is the LCP; the video is progressive enhancement. Set an explicit aspect-ratio (e.g. h-screen or aspect-video) to prevent CLS.

### Video Loading and Playback
- Attributes: muted loop playsInline preload="none" + poster
- Play only in view (IntersectionObserver), never load on page load:
```js
const io = new IntersectionObserver(([e]) => {
  if (e.isIntersecting) { v.load(); v.play().catch(() => {}); io.disconnect(); }
}, { threshold: 0.25 });
io.observe(v);
```
- Dual source: `<source src="x.webm" type="video/webm"><source src="x.mp4" type="video/mp4">`

### Readability Scrim
Before text over video, lay a gradient darkening for 4.5:1:
`linear-gradient(to top, rgba(5,6,10,0.78), rgba(5,6,10,0.2) 45%, rgba(5,6,10,0.45))`

### Dark Cinematic Grade
- Near-black base #05060A / raised surface #141821 / paper text #F3EFE8
- Text on footage: text-white + white/80 + white/60
- One warm gold #E4C063: primary CTA, chapter kickers, highlights; steel #9AA6B8 for secondary
- Optional: cv-letterbox top/bottom black bars for a widescreen frame

### Fallbacks (critical)
- prefers-reduced-motion: do not autoplay, show the poster still, offer a play button for opt-in
- Save-Data (navigator.connection.saveData): skip the video entirely, show poster only
- Mobile may show poster only (saves data + battery)

### Accessibility
- Decorative video aria-hidden="true"; informational video gets <track kind="captions">
- Provide a pause/play affordance; never strip user control

## Self-Verification Checklist

- [ ] Video has a poster and the poster is the LCP, instant
- [ ] preload="none" + play only in view (IntersectionObserver)
- [ ] muted loop playsInline, a silent seamless short loop
- [ ] Text over video sits on a scrim and passes contrast
- [ ] Critical information is in the text layer, not the video
- [ ] prefers-reduced-motion / Save-Data fallbacks present
- [ ] Dark grade + single warm-gold accent + CLS prevented

---

# Cinematic Video Hero Design System

> A cinematic opener led by a short looping video. A poster frame paints first as the LCP; the muted video autoplays and loops only once in view; text sits on a readability scrim. Dark grading and slow motion build a trailer-like immersive entrance.

## Design Philosophy

The cinematic-video-hero creed: the opener is a trailer, not a slide. Video injects a sense of time into a static page — light flowing, mist drifting, color breathing — but it must first yield to performance: the poster paints instantly, the video slips in behind it.

Core principles:
- Poster first: the poster frame is the LCP and must be instantly visible (AVIF/WebP, small and sharp). The video is progressive enhancement, never a first-paint dependency
- Video is atmosphere, not content: the background video carries mood and motion; critical information always lives in the text layer, never in the video (which may not play)
- Muted autoplay loop: muted + autoplay + loop + playsInline (silence is what allows autoplay); a short loop (6-10s) seams seamlessly, never a jarring jump-cut
- Readability scrim: text over video always sits on a gradient darkening for 4.5:1; however much the video moves, it never eats the text
- Dark cinematic grade: near-black base + low-saturation warm/cool clash + one warm-gold accent (#E4C063), like graded film
- Slow motion: cinematic slowness, not flashy speed. Motion serves mood; fast induces nausea

Design principles:
- Performance line: video preload="none", load/play only in view (IntersectionObserver), poster attribute as the floor; explicit aspect-ratio to prevent CLS; no autoplay video below the hero
- Data and fallback: honor prefers-reduced-motion (no autoplay, show the poster still), honor Save-Data (skip the video), mobile may show poster only
- Formats: prefer webm (VP9/AV1) + mp4 (H.264) dual sources; always pair with a poster
- Accessibility: decorative video gets aria-hidden; informational video gets <track> captions; give users a pause affordance

---

## Token Dictionary (exact class mapping)

### Border
```
Width: border
Color: border-white/20
Radius: rounded-xl
```

### Shadow
```
sm: shadow-[0_2px_8px_rgba(0,0,0,0.4)]
md: shadow-[0_10px_30px_rgba(0,0,0,0.5)]
lg: shadow-[0_28px_70px_rgba(0,0,0,0.6)]
hover: hover:shadow-[0_16px_44px_rgba(0,0,0,0.55)]
focus: focus-visible:ring-2 focus-visible:ring-[#E4C063]/60
```

### Interaction
```
Hover translate: (none)
Hover scale: (none)
Hover opacity: hover:bg-white/18
Transition: transition-all duration-300 ease-out
Active: active:scale-[0.98]
```

### Typefaces
```
Heading: font-semibold text-white tracking-tight
Body: text-white/80 leading-relaxed
Mono: font-mono text-[#E4C063] uppercase tracking-widest
```

### Type scale
```
Hero: text-5xl md:text-7xl
H1: text-4xl md:text-6xl
H2: text-3xl md:text-4xl
H3: text-xl md:text-2xl
Body: text-base md:text-lg
Small: text-sm
```

### Spacing
```
Section: py-24 md:py-32
Container: px-6 md:px-8
Card: p-5
Gap sm: gap-4
Gap md: gap-8
Gap lg: gap-12
```

### Color roles
```
Background primary: bg-[#05060A]
Background secondary: bg-[#141821]
Background accent: bg-[#E4C063]
Text primary: text-white
Text secondary: text-white/80
Text muted: text-white/60
Button primary: bg-[#E4C063] text-[#05060A]
Button secondary: bg-white/10 backdrop-blur-md text-white border border-white/25
```

---

## [FORBIDDEN]

These classes are banned in this style. Check for them before returning code:

### Banned classes
- `bg-gradient-to-r`
- `from-indigo-600`
- `via-purple-600`
- `to-pink-500`
- `rounded-none`
- `duration-100`

### Banned patterns
- matches `^bg-gradient-to-r$`
- matches `^from-(indigo|purple|pink|fuchsia)-`
- matches `^rounded-none$`

### Why they are banned
- `bg-gradient-to-r`: Motion and color come from the footage, not decorative gradients
- `from-indigo-600`: No AI-cliche gradients; the grade is near-black with one warm-gold accent
- `rounded-none`: Cinematic framing reads softer with rounded-xl / rounded-full
- `duration-100`: Cinematic motion is slow; snappy transitions break the mood

> WARNING: if your code contains any of the above, replace it before shipping.

---

## [REQUIRED]

### Every button must include
```
rounded-full
transition-all duration-300
active:scale-[0.98]
```

### Every card must include
```
relative overflow-hidden
rounded-xl
```

### Every input must include
```
bg-white/10 backdrop-blur-md
border border-white/25
rounded-full
text-white placeholder-white/50
focus:outline-none focus:border-[#E4C063]/70 focus:bg-white/15
transition-all duration-300
```

---

## [COMPARE] Cinematic Video Hero wrong vs right

The wrong examples below stand for generic library defaults that were never adapted to this style. Do not read them as visual suggestions.

### Button

[WRONG] **Wrong** (generic component library default, do not copy):
```html
<button class="{GENERIC_LIBRARY_BUTTON_DEFAULT}">
 Click me
</button>
```

[CORRECT] **Right** (uses this style's tokens):
```html
<button class="rounded-full transition-all duration-300 active:scale-[0.98] bg-[#E4C063] text-[#05060A]">
 Click me
</button>
```

### Card

[WRONG] **Wrong** (generic card, not adapted to this style):
```html
<div class="{GENERIC_LIBRARY_CARD_DEFAULT}">
 <h3>{TITLE}</h3>
</div>
```

[CORRECT] **Right** (uses this style's card tokens):
```html
<div class="relative overflow-hidden rounded-xl p-5">
 <h3 class="font-semibold text-white tracking-tight text-xl md:text-2xl">{TITLE}</h3>
</div>
```

### Input

[WRONG] **Wrong** (generic input, not adapted to this style):
```html
<input class="{GENERIC_LIBRARY_INPUT_DEFAULT}" />
```

[CORRECT] **Right** (uses this style's input tokens):
```html
<input class="bg-white/10 backdrop-blur-md border border-white/25 rounded-full text-white placeholder-white/50 focus:outline-none focus:border-[#E4C063]/70 focus:bg-white/15 transition-all duration-300" placeholder="{PLACEHOLDER}" />
```

---

## [TEMPLATES] Cinematic Video Hero page skeletons

These skeletons use this style's tokens only. Replace `{PLACEHOLDER}` values, but keep every token in place:

### Navigation
```html
<nav class="bg-[#05060A] text-white border border-white/20 px-6 md:px-8">
 <div class="flex items-center justify-between max-w-6xl mx-auto gap-8">
 <a href="/" class="font-semibold text-white tracking-tight text-xl md:text-2xl">
 {LOGO_TEXT}
 </a>
 <div class="flex gap-8 text-white/80 leading-relaxed text-sm">
 {NAV_LINKS}
 </div>
 </div>
</nav>
```

### Hero section
```html
<section class="bg-[#E4C063] text-white py-24 md:py-32 px-6 md:px-8">
 <div class="max-w-4xl mx-auto">
 <h1 class="font-semibold text-white tracking-tight text-5xl md:text-7xl">
 {HEADLINE}
 </h1>
 <p class="text-white/80 leading-relaxed text-base md:text-lg max-w-xl">
 {SUBHEADLINE}
 </p>
 <button class="rounded-full transition-all duration-300 active:scale-[0.98] bg-[#E4C063] text-[#05060A]">
 {CTA_TEXT}
 </button>
 </div>
</section>
```

### Card grid
```html
<section class="bg-[#05060A] text-white py-24 md:py-32 px-6 md:px-8">
 <div class="max-w-6xl mx-auto">
 <h2 class="font-semibold text-white tracking-tight text-3xl md:text-4xl">{SECTION_TITLE}</h2>
 <div class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-8">
 <!-- Card template - repeat for each card -->
 <div class="relative overflow-hidden rounded-xl p-5">
 <h3 class="font-semibold text-white tracking-tight text-xl md:text-2xl">{CARD_TITLE}</h3>
 <p class="text-white/80 leading-relaxed text-base md:text-lg text-white/60">{CARD_DESCRIPTION}</p>
 </div>
 </div>
 </div>
</section>
```

### Form input
```html
<input class="bg-white/10 backdrop-blur-md border border-white/25 rounded-full text-white placeholder-white/50 focus:outline-none focus:border-[#E4C063]/70 focus:bg-white/15 transition-all duration-300" placeholder="{PLACEHOLDER}" />
```

### Footer
```html
<footer class="bg-[#141821] text-white/80 py-24 md:py-32 px-6 md:px-8">
 <div class="max-w-6xl mx-auto">
 <div class="grid grid-cols-1 md:grid-cols-3 gap-12">
 <div>
 <span class="font-semibold text-white tracking-tight text-xl md:text-2xl">{LOGO_TEXT}</span>
 <p class="text-white/80 leading-relaxed text-sm">{TAGLINE}</p>
 </div>
 <div>
 <h4 class="font-semibold text-white tracking-tight text-xl md:text-2xl">{COLUMN_TITLE}</h4>
 <ul class="text-white/80 leading-relaxed text-sm">
 {FOOTER_LINKS}
 </ul>
 </div>
 </div>
 </div>
</footer>
```

---

## [CHECKLIST] Cinematic Video Hero post-generation self check

**Before returning code, verify every token and rule below. Fix any violation before delivering:**

### Token check
- [ ] Button includes: `rounded-full transition-all duration-300 active:scale-[0.98]`
- [ ] Card includes: `relative overflow-hidden rounded-xl`
- [ ] Input includes: `bg-white/10 backdrop-blur-md border border-white/25 rounded-full text-white placeholder-white/50 focus:outline-none focus:border-[#E4C063]/70 focus:bg-white/15 transition-all duration-300`

### Forbidden check
- [ ] Not using `bg-gradient-to-r`
- [ ] Not using `from-indigo-600`
- [ ] Not using `via-purple-600`
- [ ] Not using `to-pink-500`
- [ ] Not using `rounded-none`
- [ ] Not using `duration-100`

### Style rule check
- [ ] Poster frame as LCP: poster attribute + AVIF/WebP, small and sharp, instant
- [ ] Video muted + autoplay + loop + playsInline, a silent seamless short loop (6-10s)
- [ ] Video preload="none"; load()/play() only in view via IntersectionObserver
- [ ] Always scrim text over video with a gradient darkening for 4.5:1 contrast
- [ ] Dark cinematic grade: near-black #05060A base with one warm-gold #E4C063 accent

### Style drift check
- [ ] Does not violate: Never make the video the LCP dependency or omit the poster (blank first paint, LCP blowup)
- [ ] Does not violate: Never preload="auto" or auto-load a large video (data + performance disaster)
- [ ] Does not violate: Never put critical information inside the video (it may not play or may be downgraded)
- [ ] Does not violate: Never autoplay with sound (browsers block it and it disturbs users)
- [ ] Does not violate: Never place text directly on video with no scrim

### Delivery check
- [ ] Responsive layout holds on phone, tablet and desktop with no horizontal overflow
- [ ] Every interactive element has a visible focus state, an accessible name and a reduced-motion path
- [ ] Text contrast meets WCAG AA and colour alone never carries state
- [ ] The result is still recognizable at a glance as Cinematic Video Hero

---

## [EXAMPLES] Example prompts

### 1. 

```
Create a cinematic video-hero studio landing page with:
1. Full-screen hero: a <video muted loop playsInline preload="none"> with a poster AVIF as the LCP; load()/play() only when in view via IntersectionObserver
2. webm + mp4 dual sources; a gradient readability scrim so the headline stays legible over the footage
3. Near-black #05060A grade, one warm-gold #E4C063 accent for the kicker and primary CTA
4. Optional letterbox bars for a widescreen frame; slow, seamless loop feel
5. A scene gallery of poster-backed aspect-video cards with scrim captions
6. prefers-reduced-motion: no autoplay, show the poster still with a play button; Save-Data: skip video
7. Frosted secondary buttons and inputs that stay legible over the video; critical info only in the text layer
```

### 2. 

```
Create a cinematic product launch teaser hero with:
1. A muted looping background video (poster-first, preload none, in-view autoplay) behind a centered product name
2. Poster AVIF as LCP; explicit h-screen to avoid CLS; webm + mp4 sources
3. Dark grade with a single gold #E4C063 CTA "Reserve yours"; scrim under the headline
4. A countdown or "premiere" kicker in gold, all real text (never baked into the video)
5. Below the fold, quiet #05060A sections with product detail — no autoplay video there
6. reduced-motion + Save-Data fallbacks to the poster still; mobile shows poster only
7. A visible mute/pause control; decorative video aria-hidden
```

## Absolute Bans (Match and Refuse)

If any of the following patterns appear, it is a style violation — rewrite without exception.

- make the video the LCP dependency or omit the poster (blank first paint, LCP blowup)
- preload="auto" or auto-load a large video (data + performance disaster)
- put critical information inside the video (it may not play or may be downgraded)
- autoplay with sound (browsers block it and it disturbs users)
- place text directly on video with no scrim
- use fast / jump-cut motion or a loop that does not seam
- ignore prefers-reduced-motion or a mobile fallback

## Self-Check (Verify Before Shipping)

If any item fails, the style has drifted — fix before shipping.

- [ ] No purple-to-blue gradients
- [ ] No overused fonts (Inter, Roboto, Geist, Fraunces, Plus Jakarta Sans)
- [ ] No nested cards (cards inside cards)
- [ ] No gray text on colored backgrounds
- [ ] Body text contrast meets WCAG AA (>= 4.5:1)
- [ ] No bounce or elastic easing curves
- [ ] Animations have a prefers-reduced-motion fallback
- [ ] Body text line length capped at 65-75 characters
- [ ] No side-stripe accent borders (border-left/right > 1px)
- [ ] No gradient text (background-clip: text)
- [ ] No glassmorphism used as the default surface treatment
- [ ] No tiny uppercase tracked eyebrow labels above every section heading
- [ ] never make the video the LCP dependency or omit the poster (blank first paint, LCP blowup)
- [ ] never preload="auto" or auto-load a large video (data + performance disaster)
- [ ] never put critical information inside the video (it may not play or may be downgraded)
- [ ] never autoplay with sound (browsers block it and it disturbs users)
- [ ] never place text directly on video with no scrim