Swiss International

STYLEKIT_STYLE_REFERENCE
style_name: Swiss International
style_slug: swiss-style
style_source: /styles/swiss-style

# 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

You are a Swiss International Style design frontend development expert. All generated code must strictly follow these constraints:

## Absolute Prohibitions

- Using decorative elements
- Using serif fonts
- Over-decorating or gradient effects
- Breaking the grid system

## Must Follow

- 12-column grid system grid-cols-12
- Sans-serif fonts font-sans
- Generous whitespace p-8, gap-8
- Black and white primary bg-black, text-white, bg-white, text-black
- Red accent bg-red-600, text-red-600
- Uppercase labels uppercase tracking-[0.2em]
- Left-aligned text

## Color Palette

Only use:
- Black: #000000
- White: #ffffff
- Red: #ff0000 (accent)
- Blue: #0057b8 (optional accent)

## Typography

- Headings: Extra-large size, bold, tight line height
- Labels: Small, uppercase, wide letter spacing
- Body: Moderate size, generous line height

## Animation & Interaction Rules

- Rational Restraint: Only color and border-color change on hover -- zero `translate`, `scale`, or new `shadow`. The grid is a rational system; its geometry must not be disturbed by interaction. Forbidden: `hover:-translate-y-*`, `hover:scale-*`, `hover:shadow-*`.
- Guide Line Extension: The left border activates from `border-[#cccccc]` to `hover:border-[#ff0000]` and background shifts to `hover:bg-[#f0f0f0]` -- the structural grid line becomes a red typographic accent, making the module feel "selected" on the layout.
- Hierarchy Focus: The category/label element turns `group-hover:text-[#ff0000] transition-colors duration-150 ease-out` -- the taxonomic hierarchy is highlighted, reinforcing Swiss style's belief that information structure is the highest design value.
- Clean Cut Transitions: Use `duration-150 ease-out` for color changes. Button arrow icon uses `group-hover:translate-x-2 transition-transform duration-150 ease-out` -- the arrow is the only permitted movement, indicating directionality as a typographic element.

---

# Swiss International Design System

> A rationalist design style originating from Switzerland, emphasizing grid systems, sans-serif typography, clear hierarchy, and objective information delivery -- a cornerstone of modern graphic design.

## Design Philosophy

Swiss International Style is a design movement developed in Switzerland in the 1950s, emphasizing clear, objective, and rational visual communication.

Core principles:
- Grid system: Strict mathematical grids controlling layout
- Sans-serif typography: Clear and readable fonts like Helvetica
- Negative space: Generous whitespace enhancing readability
- Objective communication: Design serves information, not decoration

---

## Token Dictionary (exact class mapping)

### Border
```
Width: border
Color: border-black
Radius: rounded-none
```

### Shadow
```
sm: shadow-none
md: shadow-none
lg: shadow-none
hover: hover:shadow-none
focus: focus:shadow-none
```

### Interaction
```
Hover translate: (none)
Hover scale: (none)
Hover opacity: hover:opacity-80
Transition: transition-opacity duration-150
Active: active:opacity-70
```

### Typefaces
```
Heading: font-sans font-bold tracking-tight
Body: font-sans
Mono: font-mono
```

### Type scale
```
Hero: text-5xl md:text-7xl lg:text-9xl
H1: text-4xl md:text-6xl
H2: text-2xl md:text-4xl
H3: text-lg md:text-xl
Body: text-sm md:text-base
Small: text-xs md:text-sm
```

### Spacing
```
Section: py-12 md:py-24 lg:py-32
Container: px-4 md:px-8 lg:px-16
Card: p-4 md:p-6
Gap sm: gap-2 md:gap-4
Gap md: gap-4 md:gap-8
Gap lg: gap-8 md:gap-12
```

### Color roles
```
Background primary: bg-white
Background secondary: bg-black
Background accent: bg-[#ff0000]
Text primary: text-black
Text secondary: text-white
Text muted: text-gray-600
Button primary: bg-black text-white
Button secondary: bg-white text-black border border-black
```

---

## [FORBIDDEN]

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

### Banned classes
- `font-serif`
- `font-mono`
- `rounded-lg`
- `rounded-xl`
- `rounded-2xl`
- `rounded-3xl`
- `rounded-full`
- `shadow-sm`
- `shadow`
- `shadow-md`
- `shadow-lg`
- `shadow-xl`
- `shadow-2xl`
- `bg-gradient-to-r`
- `bg-gradient-to-l`
- `bg-gradient-to-b`
- `bg-gradient-to-t`
- `italic`
- `border-dashed`
- `border-dotted`

### Banned patterns
- matches `^font-(?:serif|mono)$`
- matches `^rounded-(?!none)`
- matches `^shadow-(?!none)`
- matches `^bg-gradient-`
- matches `^italic$`

### Why they are banned
- `font-serif`: Swiss Style uses Helvetica-style sans-serif only (font-sans)
- `rounded-xl`: Swiss Style uses sharp geometric corners for grid alignment (rounded-none)
- `shadow-lg`: Swiss Style avoids decorative shadows; focus on typography and grid
- `bg-gradient-to-r`: Swiss Style uses flat solid colors only, no gradients

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

---

## [REQUIRED]

### Every button must include
```
rounded-none
font-sans font-bold
transition-opacity duration-150
```

### Every card must include
```
rounded-none
border border-black
bg-white
```

### Every input must include
```
rounded-none
border border-black
font-sans
focus:outline-none
```

---

## [COMPARE] Swiss International 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-none font-sans font-bold transition-opacity duration-150 bg-black text-white">
  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="rounded-none border border-black bg-white p-4 md:p-6">
  <h3 class="font-sans font-bold tracking-tight text-lg md:text-xl">{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="rounded-none border border-black font-sans focus:outline-none" placeholder="{PLACEHOLDER}" />
```

---

## [TEMPLATES] Swiss International page skeletons

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

### Navigation
```html
<nav class="bg-white text-black border border-black px-4 md:px-8 lg:px-16">
  <div class="flex items-center justify-between max-w-6xl mx-auto gap-4 md:gap-8">
    <a href="/" class="font-sans font-bold tracking-tight text-lg md:text-xl">
      {LOGO_TEXT}
    </a>
    <div class="flex gap-4 md:gap-8 font-sans text-xs md:text-sm">
      {NAV_LINKS}
    </div>
  </div>
</nav>
```

### Hero section
```html
<section class="bg-[#ff0000] text-black py-12 md:py-24 lg:py-32 px-4 md:px-8 lg:px-16">
  <div class="max-w-4xl mx-auto">
    <h1 class="font-sans font-bold tracking-tight text-5xl md:text-7xl lg:text-9xl">
      {HEADLINE}
    </h1>
    <p class="font-sans text-sm md:text-base max-w-xl">
      {SUBHEADLINE}
    </p>
    <button class="rounded-none font-sans font-bold transition-opacity duration-150 bg-black text-white">
      {CTA_TEXT}
    </button>
  </div>
</section>
```

### Card grid
```html
<section class="bg-white text-black py-12 md:py-24 lg:py-32 px-4 md:px-8 lg:px-16">
  <div class="max-w-6xl mx-auto">
    <h2 class="font-sans font-bold tracking-tight text-2xl md:text-4xl">{SECTION_TITLE}</h2>
    <div class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4 md:gap-8">
      <!-- Card template - repeat for each card -->
      <div class="rounded-none border border-black bg-white p-4 md:p-6">
        <h3 class="font-sans font-bold tracking-tight text-lg md:text-xl">{CARD_TITLE}</h3>
        <p class="font-sans text-sm md:text-base text-gray-600">{CARD_DESCRIPTION}</p>
      </div>
    </div>
  </div>
</section>
```

### Form input
```html
<input class="rounded-none border border-black font-sans focus:outline-none" placeholder="{PLACEHOLDER}" />
```

### Footer
```html
<footer class="bg-black text-white py-12 md:py-24 lg:py-32 px-4 md:px-8 lg:px-16">
  <div class="max-w-6xl mx-auto">
    <div class="grid grid-cols-1 md:grid-cols-3 gap-8 md:gap-12">
      <div>
        <span class="font-sans font-bold tracking-tight text-lg md:text-xl">{LOGO_TEXT}</span>
        <p class="font-sans text-xs md:text-sm">{TAGLINE}</p>
      </div>
      <div>
        <h4 class="font-sans font-bold tracking-tight text-lg md:text-xl">{COLUMN_TITLE}</h4>
        <ul class="font-sans text-xs md:text-sm">
          {FOOTER_LINKS}
        </ul>
      </div>
    </div>
  </div>
</footer>
```

---

## [CHECKLIST] Swiss International post-generation self check

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

### Token check
- [ ] Button includes: `rounded-none font-sans font-bold transition-opacity duration-150`
- [ ] Card includes: `rounded-none border border-black bg-white`
- [ ] Input includes: `rounded-none border border-black font-sans focus:outline-none`

### Forbidden check
- [ ] Not using `font-serif`
- [ ] Not using `font-mono`
- [ ] Not using `rounded-lg`
- [ ] Not using `rounded-xl`
- [ ] Not using `rounded-2xl`
- [ ] Not using `rounded-3xl`
- [ ] Not using `rounded-full`
- [ ] Not using `shadow-sm`

### Style rule check
- [ ] Use strict grid systems
- [ ] Choose Helvetica or similar sans-serif fonts
- [ ] Maintain generous negative space
- [ ] Use black and white as primary colors
- [ ] Left-align text, avoid centering

### Style drift check
- [ ] Does not violate: Do NOT use decorative elements
- [ ] Does not violate: Do NOT use serif fonts for body text
- [ ] Does not violate: Do NOT over-decorate or use gradients
- [ ] Does not violate: Do NOT break the grid system
- [ ] Does not violate: Do NOT use any `translate`, `scale`, or `shadow` changes (Rational Restraint -- the grid must not be disturbed)

### 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 Swiss International

## Absolute Bans (Match and Refuse)

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

- use decorative elements
- use serif fonts for body text
- over-decorate or use gradients
- break the grid system
- use any `translate`, `scale`, or `shadow` changes (Rational Restraint -- the grid must not be disturbed)
- introduce decorations beyond color changes on hover (only color and border-color changes allowed, no shadows or transforms)
- use `duration-300` or longer (Swiss Style is precise and efficient, `duration-150 ease-out` is the upper limit)
- omit arrow icons on buttons (Swiss Style buttons must include directionality, `->` is part of the typography)

## 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
- [ ] do NOT use decorative elements
- [ ] do NOT use serif fonts for body text
- [ ] do NOT over-decorate or use gradients
- [ ] do NOT break the grid system
- [ ] do NOT use any `translate`, `scale`, or `shadow` changes (Rational Restraint -- the grid must not be disturbed)