Datum

# Datum

## Philosophy

Datum mounts live telemetry into editorial pacing: a literary serif lede, a factual mono rail, and instrumented dossier modules all set on one horizontal baseline, so an operator reads a control room like a feature spread rather than scanning a wall of identical cards. Deep graphite ground, periwinkle and pale-blue inks, one teal halation accent.

### Values

- editorial hierarchy before decorative futurism
- dense information made legible through pacing, annotation, and one shared baseline
- dark control-room atmosphere with accessibility-aware contrast
- worldbuilding through measured typographic restraint, not neon

### Anti-Values

- arcade neon overload without information structure
- generic dashboard cards with a sci-fi palette pasted on top
- skeuomorphic cockpit clutter that defeats reading flow

### Visual Character

- A deep graphite page field is segmented by hairline baseline rules and inset panel strokes, so every zone reads as typeset on a measured publication baseline rather than floating as an isolated card.
- Oversized high-contrast serif headlines sit against compact grotesk and tabular-mono columns, a prestige-editorial tension between narrative copy and operational telemetry.
- Every focal panel is a dossier module: an inset top rule (teal fading to transparent) and a bottom metadata strip carrying a timestamp, a label index, and a status dot.
- Numeric readouts, timestamps, and section indexes are rendered in mono with wide tracking and tabular rhythm, a repeated machine-led texture across the composition.
- Charts and the acquisition field sit over a faint gridline-and-scanline scaffold with crosshair registration ticks, so data appears instrumented without cartoon sci-fi chrome.
- Interactive controls reveal through border brightening, baseline underlines, and a measured teal glow instead of soft consumer fills.

## Tokens

### Colors

| Name | Value |
|------|-------|
| primary | `#8FB0FF` |
| secondary | `#C7D8FF` |
| accent | `#57E6CC` |
| background | `#070B11` |
| surface | `#0F1622` |
| text | `#F2F5FA` |
| muted | `#8E9AAD` |
| border | `#243043` |
| error | `#FF7A86` |
| success | `#6FE0A6` |
| warning | `#F2C879` |
| info | `#79C3FF` |

### Typography

- **Heading Font**: Cormorant Garamond
- **Body Font**: Space Grotesk
- **Mono Font**: IBM Plex Mono
- **Base Size**: 17px
- **Scale Ratio**: 1.25
- **Line Height**: 1.55
- **Letter Spacing**: 0.005em
- **Heading Weight**: 600
- **Heading Transform**: none
- **Google Fonts Url**: https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,500;0,600;0,700;1,500;1,600&family=IBM+Plex+Mono:wght@400;500;600&family=Space+Grotesk:wght@400;500;700&display=swap

### Spacing

- **Base**: 8px
- **Scale**: [4,8,12,16,24,32,48,64]

### Radii

- **None**: 0
- **Sm**: 0
- **Md**: 0
- **Lg**: 0
- **Full**: 9999px

### Shadows

- **Sm**: 0 0 0 1px rgba(143,176,255,.06), 0 8px 20px rgba(0,0,0,.40)
- **Md**: 0 0 0 1px rgba(143,176,255,.07), 0 14px 36px rgba(0,0,0,.45)
- **Lg**: 0 0 0 1px rgba(143,176,255,.10), 0 24px 60px rgba(0,0,0,.55)

### Surfaces

- **Treatment**: scanline
- **Card Style**: Graphite dossier modules with a faint top gradient, an inset top rule (teal fading to transparent), and a bottom metadata strip on the recess surface; glow and scanlines clipped inside severe rectangular frames.
- **Bg Pattern**: instrument-grid

### Borders

- **Default Width**: 1px
- **Accent Width**: 1px
- **Style**: solid
- **Character**: Hairline and editorial: faint separators for pacing, an inset top rule and bottom metadata strip that plate each pane into a larger instrument wall; never a heavy or single-accent edge.

### Motion

- **Duration**: 220ms
- **Easing**: cubic-bezier(0.22, 1, 0.36, 1)
- **Philosophy**: deliberate; the settled state is the no-JS default, reveals layered on top, fully disabled under prefers-reduced-motion

## Rules

### Composition

Build pages as editorial spreads with one dominant narrative column, one or two narrow factual rails split by a vertical hairline, and instrumented dossier modules anchored to a visible baseline of horizontal rules.

### Hierarchy

Lead with a literary serif headline, descend into grotesk summaries, mono metrics, and caption-scale annotations so information feels authored and sequenced rather than dumped.

### Density

High density controlled by compartmentalisation: every dense data cluster is paired with whitespace, mono labels, and the dossier metadata strip that preserves reading order.

### Signature

Every focal panel is a dossier module — an inset top rule plus a bottom metadata strip — over a faint instrument-grid-and-scanline scaffold; controls reveal through brightening hairlines and a measured teal glow, never soft fills.

## Layout

### Grid

A 12-column desktop grid with asymmetric spans, a two-column tablet reduction, and a single-column mobile stack while preserving factual rails and baseline rules wherever possible.

### Whitespace

Deliberate and editorial: generous outer margins, compact internal panel padding, and larger inter-section gaps that mimic spread pacing between chapters.

### Density

dense

### Responsive

Renders from ~390px mobile to 2560px+ ultra-wide; mobile stacks to one column and drops the least-essential table column; the full-bleed hero spans 100vw, contained content caps and centres.

### Breakpoints

- **Mobile**: 390px
- **Tablet**: 768px
- **Desktop**: 1440px
- **Ultrawide**: 1700px

## Guidance

### Do

- Pair narrative copy with telemetry so data never loses context.
- Use serif display moments sparingly but boldly against the grotesk and mono systems.
- Keep glow, gradients, and scanlines clipped inside rigid frames and the baseline rule system.
- Set numerals, timestamps, and labels in tabular mono.

### Don't

- Flood the page with neon accents on every component.
- Collapse all information into identical dashboard cards.
- Use rounded consumer-app controls or soft fills that break the instrumented editorial tone.
- Default to a light ground — this concept is dark by design.

### Accessibility

Text holds AA contrast on the graphite ground; mono labels use a lighter tone at wider tracking. Body is 17px+, table rows 14.5px+. Focus is a visible teal ring, not a colour-only cue; status is carried by a label plus a dot. Motion respects prefers-reduced-motion.

## Imagery Direction

### Pairs With

scanline-bureau

### Summary

Subjects rendered as instrumented telemetry captures: a faint hairline instrument grid with crosshair ticks, subtle scanlines, a restrained radial glow, cyan and periwinkle rim light, and one warm halation at an edge. The landing hero is a radio-telescope dish read in that technique.

### Subjects

- radio telescope dish
- deep-space antenna array
- observatory at night
- spacecraft against star field
- control-room instrument wall

### Usage

Full-viewport landing hero driven by background-image: var(--hero-image); imagery dresses a subject full-frame with the instrumentation as an overlay, never a literal gauge or dashboard object.

---
version: "alpha"
name: "Datum"
description: "Agent-curated design language exported from Katagami as DESIGN.md."
colors:
  primary: "#8FB0FF"
  secondary: "#C7D8FF"
  accent: "#57E6CC"
  background: "#070B11"
  surface: "#0F1622"
  text: "#F2F5FA"
  muted: "#8E9AAD"
  border: "#243043"
  error: "#FF7A86"
  success: "#6FE0A6"
  warning: "#F2C879"
  info: "#79C3FF"
typography:
  headline-lg:
    fontFamily: "Cormorant Garamond"
    fontSize: "2.075rem"
    fontWeight: 700
    lineHeight: 1.1
    letterSpacing: "0.005em"
  headline-md:
    fontFamily: "Cormorant Garamond"
    fontSize: "1.66rem"
    fontWeight: 600
    lineHeight: 1.15
    letterSpacing: "0.005em"
  body-md:
    fontFamily: "Space Grotesk"
    fontSize: "17px"
    fontWeight: 400
    lineHeight: 1.55
    letterSpacing: "0.005em"
  label-md:
    fontFamily: "IBM Plex Mono"
    fontSize: "0.75rem"
    fontWeight: 600
    lineHeight: 1
    letterSpacing: "0.08em"
rounded:
  none: "0px"
  sm: "0px"
  md: "0px"
  lg: "0px"
  full: "9999px"
spacing:
  base: "8px"
  xs: "4px"
  sm: "8px"
  md: "12px"
  lg: "16px"
  xl: "24px"
  2xl: "32px"
  3xl: "48px"
  4xl: "64px"
components:
  color-reference-primary:
    backgroundColor: "{colors.primary}"
  color-reference-secondary:
    backgroundColor: "{colors.secondary}"
  color-reference-accent:
    backgroundColor: "{colors.accent}"
  color-reference-background:
    backgroundColor: "{colors.background}"
  color-reference-surface:
    backgroundColor: "{colors.surface}"
  color-reference-text:
    backgroundColor: "{colors.text}"
  color-reference-muted:
    backgroundColor: "{colors.muted}"
  color-reference-border:
    backgroundColor: "{colors.border}"
  color-reference-error:
    backgroundColor: "{colors.error}"
  color-reference-success:
    backgroundColor: "{colors.success}"
  color-reference-warning:
    backgroundColor: "{colors.warning}"
  color-reference-info:
    backgroundColor: "{colors.info}"
  button-primary:
    backgroundColor: "{colors.primary}"
    textColor: "#000000"
    typography: "{typography.label-md}"
    rounded: "{rounded.md}"
    padding: "{spacing.md}"
  card-surface:
    backgroundColor: "{colors.surface}"
    textColor: "{colors.text}"
    rounded: "{rounded.md}"
    padding: "{spacing.md}"
  input-default:
    backgroundColor: "{colors.surface}"
    textColor: "{colors.text}"
    rounded: "{rounded.md}"
    height: "44px"
---

# Datum

## Overview

Datum mounts live telemetry into editorial pacing: a literary serif lede, a factual mono rail, and instrumented dossier modules all set on one horizontal baseline, so an operator reads a control room like a feature spread rather than scanning a wall of identical cards. Deep graphite ground, periwinkle and pale-blue inks, one teal halation accent.

### Values

- editorial hierarchy before decorative futurism
- dense information made legible through pacing, annotation, and one shared baseline
- dark control-room atmosphere with accessibility-aware contrast
- worldbuilding through measured typographic restraint, not neon

### Anti-Values

- arcade neon overload without information structure
- generic dashboard cards with a sci-fi palette pasted on top
- skeuomorphic cockpit clutter that defeats reading flow

### Visual Character

- A deep graphite page field is segmented by hairline baseline rules and inset panel strokes, so every zone reads as typeset on a measured publication baseline rather than floating as an isolated card.
- Oversized high-contrast serif headlines sit against compact grotesk and tabular-mono columns, a prestige-editorial tension between narrative copy and operational telemetry.
- Every focal panel is a dossier module: an inset top rule (teal fading to transparent) and a bottom metadata strip carrying a timestamp, a label index, and a status dot.
- Numeric readouts, timestamps, and section indexes are rendered in mono with wide tracking and tabular rhythm, a repeated machine-led texture across the composition.
- Charts and the acquisition field sit over a faint gridline-and-scanline scaffold with crosshair registration ticks, so data appears instrumented without cartoon sci-fi chrome.
- Interactive controls reveal through border brightening, baseline underlines, and a measured teal glow instead of soft consumer fills.

## Colors

Use the YAML color tokens as the normative palette. The prose below names the roles agents should preserve when generating UI.

| Token | Value |
|-------|-------|
| primary | `#8FB0FF` |
| secondary | `#C7D8FF` |
| accent | `#57E6CC` |
| background | `#070B11` |
| surface | `#0F1622` |
| text | `#F2F5FA` |
| muted | `#8E9AAD` |
| border | `#243043` |
| error | `#FF7A86` |
| success | `#6FE0A6` |
| warning | `#F2C879` |
| info | `#79C3FF` |

## Typography

- **Headline-Lg**: Cormorant Garamond, 2.075rem, weight 700, line-height 1.1.
- **Headline-Md**: Cormorant Garamond, 1.66rem, weight 600, line-height 1.15.
- **Body-Md**: Space Grotesk, 17px, weight 400, line-height 1.55.
- **Label-Md**: IBM Plex Mono, 0.75rem, weight 600, line-height 1.

## Layout

### Spacing Tokens

- **Base**: `8px`
- **Xs**: `4px`
- **Sm**: `8px`
- **Md**: `12px`
- **Lg**: `16px`
- **Xl**: `24px`
- **2xl**: `32px`
- **3xl**: `48px`
- **4xl**: `64px`

### Grid

A 12-column desktop grid with asymmetric spans, a two-column tablet reduction, and a single-column mobile stack while preserving factual rails and baseline rules wherever possible.

### Whitespace

Deliberate and editorial: generous outer margins, compact internal panel padding, and larger inter-section gaps that mimic spread pacing between chapters.

### Density

dense

### Responsive

Renders from ~390px mobile to 2560px+ ultra-wide; mobile stacks to one column and drops the least-essential table column; the full-bleed hero spans 100vw, contained content caps and centres.

### Breakpoints

- **Mobile**: 390px
- **Tablet**: 768px
- **Desktop**: 1440px
- **Ultrawide**: 1700px

## Elevation & Depth

### Shadows

- **Sm**: 0 0 0 1px rgba(143,176,255,.06), 0 8px 20px rgba(0,0,0,.40)
- **Md**: 0 0 0 1px rgba(143,176,255,.07), 0 14px 36px rgba(0,0,0,.45)
- **Lg**: 0 0 0 1px rgba(143,176,255,.10), 0 24px 60px rgba(0,0,0,.55)

## Shapes

### Rounded

- **None**: `0px`
- **Sm**: `0px`
- **Md**: `0px`
- **Lg**: `0px`
- **Full**: `9999px`

### Surfaces

- **Treatment**: scanline
- **Card Style**: Graphite dossier modules with a faint top gradient, an inset top rule (teal fading to transparent), and a bottom metadata strip on the recess surface; glow and scanlines clipped inside severe rectangular frames.
- **Bg Pattern**: instrument-grid

### Borders

- **Default Width**: 1px
- **Accent Width**: 1px
- **Style**: solid
- **Character**: Hairline and editorial: faint separators for pacing, an inset top rule and bottom metadata strip that plate each pane into a larger instrument wall; never a heavy or single-accent edge.

## Components

### Composition

Build pages as editorial spreads with one dominant narrative column, one or two narrow factual rails split by a vertical hairline, and instrumented dossier modules anchored to a visible baseline of horizontal rules.

### Hierarchy

Lead with a literary serif headline, descend into grotesk summaries, mono metrics, and caption-scale annotations so information feels authored and sequenced rather than dumped.

### Density

High density controlled by compartmentalisation: every dense data cluster is paired with whitespace, mono labels, and the dossier metadata strip that preserves reading order.

### Signature

Every focal panel is a dossier module — an inset top rule plus a bottom metadata strip — over a faint instrument-grid-and-scanline scaffold; controls reveal through brightening hairlines and a measured teal glow, never soft fills.

## shadcn/ui Usage

When the target app uses shadcn/ui, copy DESIGN.md with shadcn instead of the plain DESIGN.md. It contains the same Katagami design-language source plus the shadcn/ui primitives, imports, theme variables, component recipes, and preview-shot guidance.

DESIGN.md with shadcn: `/language/en-019ef884-6c99-7963-9b5c-46788111bdca/DESIGN.with-shadcn.md`.

The shadcn page also exposes optional machine-readable files for automation, but the human-facing handoff is DESIGN.md with shadcn.

Install recommended primitives with `npx shadcn@latest add button card input textarea select dialog sheet tabs badge separator checkbox switch slider tooltip dropdown-menu table`.

Use these primitives in shadcn apps:
- button
- card
- input
- textarea
- select
- dialog
- sheet
- tabs
- badge
- separator
- checkbox
- switch
- slider
- tooltip
- dropdown-menu
- table

Implementation rule for agents: import shadcn primitives from `@/components/ui/*`, apply the generated CSS variables first, then compose the language-specific recipes from the companion MD. Katagami remains the source of truth; shadcn names are the implementation surface.

## Do's and Don'ts

- Do Pair narrative copy with telemetry so data never loses context.
- Do Use serif display moments sparingly but boldly against the grotesk and mono systems.
- Do Keep glow, gradients, and scanlines clipped inside rigid frames and the baseline rule system.
- Do Set numerals, timestamps, and labels in tabular mono.
- Don't Flood the page with neon accents on every component.
- Don't Collapse all information into identical dashboard cards.
- Don't Use rounded consumer-app controls or soft fills that break the instrumented editorial tone.
- Don't Default to a light ground — this concept is dark by design.

### Accessibility

Text holds AA contrast on the graphite ground; mono labels use a lighter tone at wider tracking. Body is 17px+, table rows 14.5px+. Focus is a visible teal ring, not a colour-only cue; status is carried by a label plus a dot. Motion respects prefers-reduced-motion.

## Imagery Direction

### Pairs With

scanline-bureau

### Summary

Subjects rendered as instrumented telemetry captures: a faint hairline instrument grid with crosshair ticks, subtle scanlines, a restrained radial glow, cyan and periwinkle rim light, and one warm halation at an edge. The landing hero is a radio-telescope dish read in that technique.

### Subjects

- radio telescope dish
- deep-space antenna array
- observatory at night
- spacecraft against star field
- control-room instrument wall

### Usage

Full-viewport landing hero driven by background-image: var(--hero-image); imagery dresses a subject full-frame with the instrumentation as an overlay, never a literal gauge or dashboard object.

```json
{
  "$schema": "https://ui.shadcn.com/schema/registry-item.json",
  "name": "datum",
  "type": "registry:theme",
  "title": "Datum shadcn Theme",
  "cssVars": {
    "theme": {},
    "light": {
      "background": "#070B11",
      "foreground": "#F2F5FA",
      "card": "#0F1622",
      "card-foreground": "#F2F5FA",
      "popover": "#0F1622",
      "popover-foreground": "#F2F5FA",
      "primary": "#8FB0FF",
      "primary-foreground": "#ffffff",
      "secondary": "#C7D8FF",
      "secondary-foreground": "#111111",
      "muted": "#8E9AAD",
      "muted-foreground": "#F2F5FA",
      "accent": "#57E6CC",
      "accent-foreground": "#111111",
      "destructive": "#FF7A86",
      "border": "#243043",
      "input": "#243043",
      "ring": "#57E6CC",
      "chart-1": "#8FB0FF",
      "chart-2": "#C7D8FF",
      "chart-3": "#57E6CC",
      "chart-4": "#6FE0A6",
      "chart-5": "#F2C879",
      "sidebar": "#0F1622",
      "sidebar-foreground": "#F2F5FA",
      "sidebar-primary": "#8FB0FF",
      "sidebar-primary-foreground": "#ffffff",
      "sidebar-accent": "#79C3FF",
      "sidebar-accent-foreground": "#ffffff",
      "sidebar-border": "#243043",
      "sidebar-ring": "#57E6CC",
      "radius": "0"
    },
    "dark": {
      "background": "#0f1115",
      "foreground": "#f8fafc",
      "card": "#181b22",
      "card-foreground": "#f8fafc",
      "popover": "#181b22",
      "popover-foreground": "#f8fafc",
      "primary": "#8FB0FF",
      "primary-foreground": "#ffffff",
      "secondary": "#252a33",
      "secondary-foreground": "#f8fafc",
      "muted": "#252a33",
      "muted-foreground": "#a1a1aa",
      "accent": "#57E6CC",
      "accent-foreground": "#111111",
      "destructive": "#FF7A86",
      "border": "#303642",
      "input": "#303642",
      "ring": "#57E6CC",
      "chart-1": "#8FB0FF",
      "chart-2": "#C7D8FF",
      "chart-3": "#57E6CC",
      "chart-4": "#6FE0A6",
      "chart-5": "#F2C879",
      "sidebar": "#181b22",
      "sidebar-foreground": "#f8fafc",
      "sidebar-primary": "#8FB0FF",
      "sidebar-primary-foreground": "#ffffff",
      "sidebar-accent": "#57E6CC",
      "sidebar-accent-foreground": "#111111",
      "sidebar-border": "#303642",
      "sidebar-ring": "#57E6CC",
      "radius": "0"
    }
  },
  "meta": {
    "source": "katagami",
    "languageId": "en-019ef884-6c99-7963-9b5c-46788111bdca",
    "slug": "datum",
    "componentManifest": [
      "button",
      "card",
      "input",
      "textarea",
      "select",
      "dialog",
      "sheet",
      "tabs",
      "badge",
      "separator",
      "checkbox",
      "switch",
      "slider",
      "tooltip",
      "dropdown-menu",
      "table"
    ],
    "installCommand": "npx shadcn@latest add button card input textarea select dialog sheet tabs badge separator checkbox switch slider tooltip dropdown-menu table",
    "nativeTokenNames": {
      "colors": [
        "accent",
        "background",
        "border",
        "error",
        "info",
        "muted",
        "primary",
        "secondary",
        "success",
        "surface",
        "text",
        "warning"
      ],
      "typography": [
        "base_size",
        "body_font",
        "google_fonts_url",
        "heading_font",
        "heading_transform",
        "heading_weight",
        "letter_spacing",
        "line_height",
        "mono_font",
        "scale_ratio"
      ],
      "spacing": [
        "base",
        "scale"
      ],
      "radii": [
        "full",
        "lg",
        "md",
        "none",
        "sm"
      ],
      "shadows": [
        "lg",
        "md",
        "sm"
      ],
      "surfaces": [
        "bg_pattern",
        "card_style",
        "treatment"
      ],
      "borders": [
        "accent_width",
        "character",
        "default_width",
        "style"
      ],
      "motion": [
        "duration",
        "easing",
        "philosophy"
      ]
    }
  }
}
```