一番イケてるWebページを作れるAIはどれだ？GPT 5.2 vs Gemini 3.0 Pro vs Opus 4.5 vs bolt.new vs v0 vs Lovable

# Landing Page Creation for "Sumineko" (Corner Cat)

## Request
Design and implement a landing page (Top page only) for the smartphone app "Sumineko".
**You have full creative freedom** regarding the layout, color palette, typography, and copywriting. Please build what you consider to be the **most attractive and modern** design for this product.

## Product Concept
- **App Name**: Sumineko (Corner Cat)
- **Core Value**: A "healing" app that lets users watch cat videos in a Picture-in-Picture (PiP) window while multitasking on their phone.
- **Vibe**: Relaxing, Minimal, Cute but sophisticated.

## Technical Stack
- Next.js 15 (App Router)
- Tailwind CSS
- TypeScript
- Lucide React (for icons)

## Essential Sections (Skeleton)
Please include the following three sections. The order and presentation are up to you.

### 1. Hero Section
- Create a catchy headline and sub-headline that conveys the app's appeal.
- Include "App Store" and "Google Play" buttons (UI only).
- Use a placeholder or CSS art for the main visual.

### 2. Experience / Demo Section (Critical Logic)
This section must adapt based on the user's device:
- **On Desktop (PC)**: Display a mock "Video Player" and a "Start Picture-in-Picture" button to let users simulate the experience in the browser.
- **On Mobile**: Display a message like "Experience the demo on PC" and guide them to the App Store buttons instead.

### 3. Collection Section
- Introduce the feature where users can "collect" the cats they have watched.
- visualize this "collection" aspect (e.g., a grid of cat placeholders, a list, etc.).

## Assets & Copy
- **No assets provided**: Use placeholders (e.g., `via.placeholder.com` or CSS shapes) for all images and videos.
- **Copywriting**: Please write engaging English copy for headings and descriptions based on the product concept.

## Goal
Surprise me with a high-quality, polished UI that balances "Healing/Cute" with "Modern Web Design."

# Landing Page Creation for "Sumineko" (Corner Cat)

## Project Overview
Create a landing page (Top page only) for the smartphone app "Sumineko" (Corner Cat), which allows users to watch cat videos in Picture-in-Picture (PiP) mode while multitasking. The PC browser version offers a free trial, while the smartphone version is a paid app.

## Assets
- **No assets are provided in advance.**
- Please use **placeholders** (e.g., solid colors, CSS patterns, or placeholder image services like `via.placeholder.com`) for all images, icons, and videos.
- Assume the file paths for images will be logically placed in `/public/images/` for future replacement, but use placeholders for now.

## Technical Requirements
- **Framework**: Next.js 15 (App Router)
- **Styling**: TailwindCSS
- **Language**: TypeScript
- **Deployment**: Targeted for Cloudflare Pages
- **i18n**: Foundation for multi-language support required (manage text in JSON files).
  - Create the **English** version as the default.
- **Code Quality**: Ensure components are modular and reusable. Avoid monolithic files.
- **Images**: Use standard `<img>` or Next.js `<Image>` with placeholder sources.
- **Videos**: Lazy loading implementation (Intersection Observer).
- **Fonts**: System fonts or optimized Fonts (e.g., Inter or a rounded font for a soft look).

## Environment Variables
Assume the following environment variables are used:
- `NEXT_PUBLIC_STORE_MODE` - Values: `coming-soon` or `live`
- `NEXT_PUBLIC_APP_STORE_URL` - URL for App Store
- `NEXT_PUBLIC_GOOGLE_PLAY_URL` - URL for Google Play

## Color Palette
- **Background**: #FAF8F5 (Warm off-white)
- **Main Text**: #8B7355 (Brownish)
- **Accent**: Add a soft, harmonious color if necessary.

## Design Guidelines
- Minimal and clean.
- Focus on "what we want to show the user" in each section.
- A soft, healing atmosphere suitable for a cat app.
- No header required.

---

## Page Structure

### 1. Top Page (`/`)

#### Section 1: Hero

**Layout**: 2 columns (Text on Left, Video on Right).

**Left Side:**
- **Mascot Image**: Use a placeholder.
- **Catchphrase**: "Cats in the Corner of Your Screen."
- **Sub-copy**: "Just open and play. Infinite cat videos for your multitasking moments."

- **3 Selling Points (Use icons for visual appeal):**
  1. **"Instant Comfort"** - One tap to play. No searching, no choosing.
  2. **"Heal Your Mind"** - Perfect for when you feel tired, stressed, or lonely.
  3. **"Stay Focused"** - Unintrusive PiP window. Work and study with cats by your side.

- **Store Buttons:**
  - If `NEXT_PUBLIC_STORE_MODE` is `coming-soon` -> Show "Coming Soon" label.
  - If `NEXT_PUBLIC_STORE_MODE` is `live` -> Show Store Links.

- **Supplementary Text**: "One-time purchase. Yours forever."

**Right Side:**
- **Demo Video Frame**:
  - Placeholder for WebM video (muted, loop, auto-play).
  - Ensure a poster image (thumbnail) can be set.

---

#### Section 2: Experience Section

**PC View:**
- **Heading**: "Try Sumineko in Your Browser"
- **Description**: "Click the button below to start the Picture-in-Picture player. Enjoy the cats while you work on other tasks."
- **Video Player Frame**: Placeholder (Logic implementation not required yet).
- **"Start PiP" Button**: UI only (Functionality to be implemented later).

**Mobile View:**
- **Heading**: "Try the Web Demo on Desktop"
- **Description**: "Open this page on your computer to try the Picture-in-Picture mode for free."
- **Action**: Display Store Buttons prominently.

---

#### Section 3: Collection Introduction

- **Heading**: "Build Your Cat Collection"
- **Description**: "Every cat you meet is saved to your history. Revisit your favorites anytime."
- **Visual**: Placeholder for Collection Screen Screenshot.
- **Note**: Indicate clearly that this feature is exclusive to the smartphone app.

---

#### Section 4: Final CTA

- **Heading**: "Take the Cats Wherever You Go"
- **Action**: Store Buttons (Reuse component from Hero).

---

#### Section 5: Footer

- **Links**:
  - Privacy Policy (Link to `/privacy` - page implementation not required)
  - Contact (External link, URL changes based on locale):
    - ja -> `https://yukapero.com/ja/contact`
    - en-US -> `https://yukapero.com/en/contact`
    - (and so on for other locales, default to `en/contact`)
- **Copyright**: © 2025 yukapero

---

## Responsive Design

### PC (1024px+)
- Full feature display.
- Hero: 2-column layout (Text Left, Video Right).
- Experience Section: Show Video Player + PiP Button.

### Tablet (768px - 1023px)
- Hero: Keep 2 columns but compact.
- Experience Section: Same as PC.

### Smartphone (767px-)
- Hero: 1 column (Text Top, Video Bottom).
- Experience Section: Switch to "Experience on PC" message.
- Emphasize Store Buttons.

---

## i18n Infrastructure

- Load all text from JSON files (e.g., `/locales/en.json`).
- **Do not hardcode text in components.**
- Structure should allow easy addition of other languages later.
- Locale switching via URL path (`/en/`, `/ja/`) or similar mechanism.

---

## Accessibility (Basic)

- Proper `alt` attributes for images.
- Focus indicators for buttons/links.
- Sufficient color contrast for readability.

---

## Notes

- **No logic required** for video playback or PiP function (UI only).
- **Metadata/OGP**: Use temporary dummy data.
- **Favicon**: Use a placeholder or comment out the reference if file is missing.