Hohlraum

# Hohlraum

## Philosophy

Bauhaus workshop logic read through an opposite lens: a subtractive system on a deep cobalt-midnight void where colour is light let through windows cut in the dark, and every element hangs in balance off a single diagonal beam like a Calder mobile. The dark is the figure, not the background; nothing is mounted and nothing floats. Primary geometry, disciplined asymmetry, and type-as-architecture remain, but expressed as apertures and counterweights rather than rules drawn on paper. Named after the Hohlraum Observatorium at Kessler Ridge.

### Values

- Subtraction over addition: colour is cut from the dark, not painted on
- Balance over stacking: layout cantilevers off one axis
- Geometric clarity before ornament
- Type plotted in mixed-case baselines, read across

### Anti-Values

- Slab-shadow mounting and drawn card edges
- Uppercase-locked poster headlines
- Ivory/paper washes and atmospheric gradients
- Invisible containers and single accent edges

### Visual Character

- A deep cobalt-midnight void is the ground and the figure; a faint 48px construction grid reads as a plotting chart, never paper.
- Colour appears only as luminous primary shapes cropped by a panel edge, glowing like light through a cut window; there are no slab shadows and no drawn card borders.
- Stat rows and KPI weights hang from thin wires at different moment-arms off one diagonal beam, so heavier numbers visibly drop lower.
- Display type is heavy condensed Anton set in mixed case on stacked baselines; labels are wide-tracked JetBrains Mono, with section tags set vertically along the left margin.
- Layouts are asymmetric because they are balanced: a master beam with cantilevered weights replaces the stat-card grid, and panels are windows cut from the void rather than tiles laid on it.

## Tokens

### Colors

| Name | Value |
|------|-------|
| bg | `#0E1633` |
| surface | `#16204A` |
| surface_2 | `#1E2A5C` |
| text | `#EAF0FF` |
| muted | `#8E9BC8` |
| border | `#2C3A72` |
| accent | `#FF5436` |
| accent_2 | `#2F6BFF` |
| accent_3 | `#FFC23D` |
| on_accent | `#0E1633` |
| on_accent_3 | `#0E1633` |
| success | `#3FCB8E` |
| warning | `#FFC23D` |
| error | `#FF5436` |
| info | `#2F6BFF` |

### Typography

- **Base Size**: 17px
- **Body Font**: Inter
- **Heading Font**: Anton
- **Mono Font**: JetBrains Mono
- **Heading Weight**: 400
- **Heading Transform**: none
- **Letter Spacing**: 0.01em
- **Line Height**: 1.55
- **Google Fonts Url**: https://fonts.googleapis.com/css2?family=Anton&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;700&display=swap

### Radii

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

### Shadows

- **None**: none

### Spacing

- **Base**: 8px
- **Scale**: [4,8,12,16,24,32,48,64,96]

### Surfaces

- **Treatment**: cut-window
- **Card Style**: Windows cut from the midnight void: a chamber-surface fill with no border and no shadow, marked by one luminous primary shape cropped by the panel edge that reads as light coming through an aperture.
- **Bg Pattern**: 48px faint construction/plotting grid

### Borders

- **Default Width**: 1px
- **Accent Width**: 2px
- **Style**: solid
- **Character**: Hairline structural rules in cobalt-charcoal (#2C3A72) used only to separate rows and gate sections; depth comes from cut-out apertures, never from a mounted edge or a single accent border.

### Motion

- **Duration**: 180ms
- **Easing**: cubic-bezier(0.2, 0.8, 0.2, 1)
- **Philosophy**: snappy and meaningful; buttons lift and brighten on hover; settled state visible with no JS, reveal gated behind html.js; respects prefers-reduced-motion

## Rules

### Composition

Compose each screen as a balance system, not a poster: a single diagonal beam from which weights hang at different moment-arms, and panels that are windows cut from the midnight void rather than tiles laid on a field. Disciplined asymmetry comes from balance, not from widening a column.

### Hierarchy

Hierarchy comes from drop-depth on the beam, from condensed mixed-case display scale, and from luminous cut-out apertures that pull the eye; never from shadow or border weight.

### Density

Operational but segmented: each module is its own cut window with a negative-space buffer of dark void around it.

### Signature

Subtractive cut-out windows of luminous primary colour cropped by panel edges; a single diagonal balance beam with cantilevered weights at staggered drops; mixed-case condensed display on stacked baselines; vertical mono section tags; no slab shadows and no card borders.

## Layout

### Grid

An open masthead across the header; content on a 12-column feel capped at 1280px. The beam/hanger pattern replaces the stat-card grid; feature splits pair a cut-window visual with a listed text column.

### Whitespace

Deliberate dark negative space around each cut window; generous padding inside panels; always pad above titles; section tags run vertically in the left margin.

### Density

Operational, segmented, each module ruled by space and aperture rather than by box edges.

### Responsive

Renders from ~390px mobile to 2560px+ ultra-wide; single column on mobile with non-essential nav hidden and tables scrollable; the full-bleed hero spans 100vw; contained content caps at 1280px and centres on ultra-wide; minmax(0,1fr) columns and min-width:0 children so grids never overflow.

### Breakpoints

- **Mobile**: 620px
- **Tablet**: 980px
- **Desktop**: 1280px

## Guidance

### Do

- Let the midnight void be the figure; cut colour in as light through apertures.
- Hang elements in balance off one diagonal beam and vary the drops.
- Set display type in mixed-case stacked baselines; keep mono labels tracked and uppercase.
- Make one button clearly primary in vermilion; keep the rest quieter.

### Don't

- Do not mount blocks on hard offset slab shadows or draw card borders.
- Do not set headlines as uppercase locked blocks.
- Do not wash the ground to ivory or add gradients for atmosphere.
- Do not give a card a single accent edge, or nest cards.

### Accessibility

Body text 17px+; table rows 14.5px+. Starlight text on the midnight void and on the chamber surface clears AA; dark ink reads on every luminous plane. Focus is a visible 2px cobalt inset ring on every form control. Icons are SVG primitives, never symbol glyphs. Respects prefers-reduced-motion.

## Imagery Direction

### Pairs With

werkblock

### Summary

Geometric-reduction print in the Werkblock technique, recast onto a deep cobalt-midnight ground: subjects rebuilt entirely from flat primary shapes snapped to a construction grid, glowing as luminous vermilion / cobalt / amber planes as if lit from behind, held by hard drafting rules. Completely flat colour, no shading; disciplined asymmetry with calm dark negative space reserved for a legible overlay.

### Subjects

- observatory domes and telescopes
- orreries and planetary systems
- hanging balance mobiles of primary solids
- instructional star-chart and plotting scenes

### Usage

Full-bleed landing hero with dense geometric construction clustered on one side and calm midnight negative space on the other for a legible overlay plate. Drive with background-image: var(--hero-image).

---
version: "alpha"
name: "Hohlraum"
description: "Agent-curated design language exported from Katagami as DESIGN.md."
colors:
  bg: "#0E1633"
  surface: "#16204A"
  surface_2: "#1E2A5C"
  text: "#EAF0FF"
  muted: "#8E9BC8"
  border: "#2C3A72"
  accent: "#FF5436"
  accent_2: "#2F6BFF"
  accent_3: "#FFC23D"
  on_accent: "#0E1633"
  on_accent_3: "#0E1633"
  success: "#3FCB8E"
  warning: "#FFC23D"
  error: "#FF5436"
  info: "#2F6BFF"
typography:
  headline-lg:
    fontFamily: "Anton"
    fontSize: "2.075rem"
    fontWeight: 700
    lineHeight: 1.1
    letterSpacing: "0.01em"
  headline-md:
    fontFamily: "Anton"
    fontSize: "1.66rem"
    fontWeight: 600
    lineHeight: 1.15
    letterSpacing: "0.01em"
  body-md:
    fontFamily: "Inter"
    fontSize: "17px"
    fontWeight: 400
    lineHeight: 1.5
    letterSpacing: "0.01em"
  label-md:
    fontFamily: "JetBrains Mono"
    fontSize: "0.75rem"
    fontWeight: 600
    lineHeight: 1
    letterSpacing: "0.08em"
rounded:
  none: "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"
  step-8: "96px"
components:
  color-reference-bg:
    backgroundColor: "{colors.bg}"
  color-reference-surface:
    backgroundColor: "{colors.surface}"
  color-reference-surface_2:
    backgroundColor: "{colors.surface_2}"
  color-reference-text:
    backgroundColor: "{colors.text}"
  color-reference-muted:
    backgroundColor: "{colors.muted}"
  color-reference-border:
    backgroundColor: "{colors.border}"
  color-reference-accent:
    backgroundColor: "{colors.accent}"
  color-reference-accent_2:
    backgroundColor: "{colors.accent_2}"
  color-reference-accent_3:
    backgroundColor: "{colors.accent_3}"
  color-reference-on_accent:
    backgroundColor: "{colors.on_accent}"
  color-reference-on_accent_3:
    backgroundColor: "{colors.on_accent_3}"
  color-reference-success:
    backgroundColor: "{colors.success}"
  color-reference-warning:
    backgroundColor: "{colors.warning}"
  color-reference-error:
    backgroundColor: "{colors.error}"
  color-reference-info:
    backgroundColor: "{colors.info}"
  button-primary:
    backgroundColor: "{colors.accent}"
    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"
---

# Hohlraum

## Overview

Bauhaus workshop logic read through an opposite lens: a subtractive system on a deep cobalt-midnight void where colour is light let through windows cut in the dark, and every element hangs in balance off a single diagonal beam like a Calder mobile. The dark is the figure, not the background; nothing is mounted and nothing floats. Primary geometry, disciplined asymmetry, and type-as-architecture remain, but expressed as apertures and counterweights rather than rules drawn on paper. Named after the Hohlraum Observatorium at Kessler Ridge.

### Values

- Subtraction over addition: colour is cut from the dark, not painted on
- Balance over stacking: layout cantilevers off one axis
- Geometric clarity before ornament
- Type plotted in mixed-case baselines, read across

### Anti-Values

- Slab-shadow mounting and drawn card edges
- Uppercase-locked poster headlines
- Ivory/paper washes and atmospheric gradients
- Invisible containers and single accent edges

### Visual Character

- A deep cobalt-midnight void is the ground and the figure; a faint 48px construction grid reads as a plotting chart, never paper.
- Colour appears only as luminous primary shapes cropped by a panel edge, glowing like light through a cut window; there are no slab shadows and no drawn card borders.
- Stat rows and KPI weights hang from thin wires at different moment-arms off one diagonal beam, so heavier numbers visibly drop lower.
- Display type is heavy condensed Anton set in mixed case on stacked baselines; labels are wide-tracked JetBrains Mono, with section tags set vertically along the left margin.
- Layouts are asymmetric because they are balanced: a master beam with cantilevered weights replaces the stat-card grid, and panels are windows cut from the void rather than tiles laid on it.

## Colors

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

| Token | Value |
|-------|-------|
| bg | `#0E1633` |
| surface | `#16204A` |
| surface_2 | `#1E2A5C` |
| text | `#EAF0FF` |
| muted | `#8E9BC8` |
| border | `#2C3A72` |
| accent | `#FF5436` |
| accent_2 | `#2F6BFF` |
| accent_3 | `#FFC23D` |
| on_accent | `#0E1633` |
| on_accent_3 | `#0E1633` |
| success | `#3FCB8E` |
| warning | `#FFC23D` |
| error | `#FF5436` |
| info | `#2F6BFF` |

## Typography

- **Headline-Lg**: Anton, 2.075rem, weight 700, line-height 1.1.
- **Headline-Md**: Anton, 1.66rem, weight 600, line-height 1.15.
- **Body-Md**: Inter, 17px, weight 400, line-height 1.5.
- **Label-Md**: JetBrains 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`
- **Step-8**: `96px`

### Grid

An open masthead across the header; content on a 12-column feel capped at 1280px. The beam/hanger pattern replaces the stat-card grid; feature splits pair a cut-window visual with a listed text column.

### Whitespace

Deliberate dark negative space around each cut window; generous padding inside panels; always pad above titles; section tags run vertically in the left margin.

### Density

Operational, segmented, each module ruled by space and aperture rather than by box edges.

### Responsive

Renders from ~390px mobile to 2560px+ ultra-wide; single column on mobile with non-essential nav hidden and tables scrollable; the full-bleed hero spans 100vw; contained content caps at 1280px and centres on ultra-wide; minmax(0,1fr) columns and min-width:0 children so grids never overflow.

### Breakpoints

- **Mobile**: 620px
- **Tablet**: 980px
- **Desktop**: 1280px

## Elevation & Depth

### Shadows

- **None**: none

## Shapes

### Rounded

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

### Surfaces

- **Treatment**: cut-window
- **Card Style**: Windows cut from the midnight void: a chamber-surface fill with no border and no shadow, marked by one luminous primary shape cropped by the panel edge that reads as light coming through an aperture.
- **Bg Pattern**: 48px faint construction/plotting grid

### Borders

- **Default Width**: 1px
- **Accent Width**: 2px
- **Style**: solid
- **Character**: Hairline structural rules in cobalt-charcoal (#2C3A72) used only to separate rows and gate sections; depth comes from cut-out apertures, never from a mounted edge or a single accent border.

## Components

### Composition

Compose each screen as a balance system, not a poster: a single diagonal beam from which weights hang at different moment-arms, and panels that are windows cut from the midnight void rather than tiles laid on a field. Disciplined asymmetry comes from balance, not from widening a column.

### Hierarchy

Hierarchy comes from drop-depth on the beam, from condensed mixed-case display scale, and from luminous cut-out apertures that pull the eye; never from shadow or border weight.

### Density

Operational but segmented: each module is its own cut window with a negative-space buffer of dark void around it.

### Signature

Subtractive cut-out windows of luminous primary colour cropped by panel edges; a single diagonal balance beam with cantilevered weights at staggered drops; mixed-case condensed display on stacked baselines; vertical mono section tags; no slab shadows and no card borders.

## 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-019ef955-36d8-7a40-a11a-febdb9872c0c/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 Let the midnight void be the figure; cut colour in as light through apertures.
- Do Hang elements in balance off one diagonal beam and vary the drops.
- Do Set display type in mixed-case stacked baselines; keep mono labels tracked and uppercase.
- Do Make one button clearly primary in vermilion; keep the rest quieter.
- Don't Do not mount blocks on hard offset slab shadows or draw card borders.
- Don't Do not set headlines as uppercase locked blocks.
- Don't Do not wash the ground to ivory or add gradients for atmosphere.
- Don't Do not give a card a single accent edge, or nest cards.

### Accessibility

Body text 17px+; table rows 14.5px+. Starlight text on the midnight void and on the chamber surface clears AA; dark ink reads on every luminous plane. Focus is a visible 2px cobalt inset ring on every form control. Icons are SVG primitives, never symbol glyphs. Respects prefers-reduced-motion.

## Imagery Direction

### Pairs With

werkblock

### Summary

Geometric-reduction print in the Werkblock technique, recast onto a deep cobalt-midnight ground: subjects rebuilt entirely from flat primary shapes snapped to a construction grid, glowing as luminous vermilion / cobalt / amber planes as if lit from behind, held by hard drafting rules. Completely flat colour, no shading; disciplined asymmetry with calm dark negative space reserved for a legible overlay.

### Subjects

- observatory domes and telescopes
- orreries and planetary systems
- hanging balance mobiles of primary solids
- instructional star-chart and plotting scenes

### Usage

Full-bleed landing hero with dense geometric construction clustered on one side and calm midnight negative space on the other for a legible overlay plate. Drive with background-image: var(--hero-image).

```json
{
  "$schema": "https://ui.shadcn.com/schema/registry-item.json",
  "name": "hohlraum",
  "type": "registry:theme",
  "title": "Hohlraum shadcn Theme",
  "cssVars": {
    "theme": {},
    "light": {
      "background": "#0E1633",
      "foreground": "#EAF0FF",
      "card": "#16204A",
      "card-foreground": "#EAF0FF",
      "popover": "#16204A",
      "popover-foreground": "#EAF0FF",
      "primary": "#EAF0FF",
      "primary-foreground": "#111111",
      "secondary": "#f4f4f5",
      "secondary-foreground": "#111111",
      "muted": "#8E9BC8",
      "muted-foreground": "#EAF0FF",
      "accent": "#FF5436",
      "accent-foreground": "#ffffff",
      "destructive": "#FF5436",
      "border": "#2C3A72",
      "input": "#2C3A72",
      "ring": "#FF5436",
      "chart-1": "#EAF0FF",
      "chart-2": "#f4f4f5",
      "chart-3": "#FF5436",
      "chart-4": "#3FCB8E",
      "chart-5": "#FFC23D",
      "sidebar": "#16204A",
      "sidebar-foreground": "#EAF0FF",
      "sidebar-primary": "#EAF0FF",
      "sidebar-primary-foreground": "#111111",
      "sidebar-accent": "#2F6BFF",
      "sidebar-accent-foreground": "#ffffff",
      "sidebar-border": "#2C3A72",
      "sidebar-ring": "#FF5436",
      "radius": "0"
    },
    "dark": {
      "background": "#0f1115",
      "foreground": "#f8fafc",
      "card": "#181b22",
      "card-foreground": "#f8fafc",
      "popover": "#181b22",
      "popover-foreground": "#f8fafc",
      "primary": "#EAF0FF",
      "primary-foreground": "#111111",
      "secondary": "#252a33",
      "secondary-foreground": "#f8fafc",
      "muted": "#252a33",
      "muted-foreground": "#a1a1aa",
      "accent": "#FF5436",
      "accent-foreground": "#ffffff",
      "destructive": "#FF5436",
      "border": "#303642",
      "input": "#303642",
      "ring": "#FF5436",
      "chart-1": "#EAF0FF",
      "chart-2": "#f4f4f5",
      "chart-3": "#FF5436",
      "chart-4": "#3FCB8E",
      "chart-5": "#FFC23D",
      "sidebar": "#181b22",
      "sidebar-foreground": "#f8fafc",
      "sidebar-primary": "#EAF0FF",
      "sidebar-primary-foreground": "#111111",
      "sidebar-accent": "#FF5436",
      "sidebar-accent-foreground": "#ffffff",
      "sidebar-border": "#303642",
      "sidebar-ring": "#FF5436",
      "radius": "0"
    }
  },
  "meta": {
    "source": "katagami",
    "languageId": "en-019ef955-36d8-7a40-a11a-febdb9872c0c",
    "slug": "hohlraum",
    "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",
        "accent_2",
        "accent_3",
        "bg",
        "border",
        "error",
        "info",
        "muted",
        "on_accent",
        "on_accent_3",
        "success",
        "surface",
        "surface_2",
        "text",
        "warning"
      ],
      "typography": [
        "base_size",
        "body_font",
        "google_fonts_url",
        "heading_font",
        "heading_transform",
        "heading_weight",
        "letter_spacing",
        "line_height",
        "mono_font"
      ],
      "radii": [
        "full",
        "lg",
        "md",
        "none"
      ],
      "shadows": [
        "none"
      ],
      "spacing": [
        "base",
        "scale"
      ],
      "surfaces": [
        "bg_pattern",
        "card_style",
        "treatment"
      ],
      "borders": [
        "accent_width",
        "character",
        "default_width",
        "style"
      ],
      "motion": [
        "duration",
        "easing",
        "philosophy"
      ]
    }
  }
}
```