Caliper

# Caliper

## Philosophy

A dark precision-metrology interface. The page behaves like the beam of a measuring caliper: gradations run its full length, values are clamped to the scale, deep violet jaws set scope, and a single chartreuse vernier marks the one live reading. Nothing glows that is not being measured.

### Values

- The product reading is the hero; structure is the engraved rule, not chrome.
- Deep violet is supervisory authority: selected scope, active controls, primary decisions.
- Chartreuse is one live index per scale only — under five percent of any surface.
- Restraint is the instrument: hairlines, space, and disciplined radii instead of colour fields.

### Anti-Values

- No rainbow UI, coloured side rails, stripe accents, dotted or grid textures, gradient washes, or confetti.
- No casual neon; chartreuse never floods a surface or becomes a fill or background.
- No glow without a reading, no rail without a measurement, no arbitrary mixed radii.

### Visual Character

- Graphite-violet near-black ground with neutrals tuned cool to the violet temperature.
- An engraved measurement rail (major and minor ticks) anchors the chrome of every surface.
- A single chartreuse vernier index marks the live reading, threshold, or decisive action.
- Violet capsule jaws frame scope and primary actions; monospace readouts clamp to the rule.
- Dark flat panels defined by stone-violet hairlines, never coloured edges or rails.

## Tokens

### Colors

| Name | Value |
|------|-------|
| bg | `#16131F` |
| surface | `#1F1A2B` |
| surface_2 | `#272036` |
| text | `#F2F0F6` |
| muted | `#9B95AD` |
| border | `#332B47` |
| accent | `#7C4DDB` |
| accent_deep | `#5A2EA6` |
| on_accent | `#FFFFFF` |
| signal | `#C9F24A` |
| on_signal | `#16131F` |
| success | `#9FD13A` |
| warning | `#E0B33A` |
| error | `#E0586A` |
| info | `#8A7BD8` |

### Typography

- **Base Size**: 17px
- **Body Font**: Inter
- **Heading Font**: Space Grotesk
- **Mono Font**: Space Mono
- **Heading Weight**: 700
- **Heading Transform**: none
- **Letter Spacing**: -0.02em
- **Line Height**: 1.55
- **Scale Ratio**: 1.22
- **Google Fonts Url**: https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@400;500;600&family=Space+Mono:wght@400;700&display=swap

### Radii

- **None**: 0
- **Card**: 16px
- **Lg**: 24px
- **Pill**: 9999px

### Shadows

- **Sm**: 0 1px 2px rgba(0,0,0,0.4)
- **Md**: 0 18px 44px rgba(0,0,0,0.45)
- **Lg**: 0 40px 100px rgba(0,0,0,0.55)

### Spacing

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

### Surfaces

- **Bg Pattern**: No dots, no grid; the ground is an uninterrupted graphite-violet field. The only repeating mark is the engraved measurement rail.
- **Card Style**: Flat dark panels, 16px radius, a single 1px stone-violet hairline, restrained shadow only when elevated.
- **Treatment**: Dark graphite-violet planes with hairline structure; chartreuse never washes a surface.

### Borders

- **Default Width**: 1px
- **Accent Width**: 1.5px
- **Style**: solid
- **Character**: Stone-violet hairlines for structure; violet only for selected outlines and focus, chartreuse only for the live vernier index, never decorative rails.

### Motion

- **Duration**: 180ms
- **Easing**: cubic-bezier(0.2, 0.0, 0.1, 1)
- **Philosophy**: Instrument calibration: short fades, 1-2px lifts, exact index movement, no bounce or spectacle; respects prefers-reduced-motion.

## Rules

### Composition

A reading column anchored to an engraved measurement rail; a large measured stage offsets compact violet instrument clusters, never a generic dashboard grid.

### Hierarchy

Hierarchy is scale, weight, and isolation; violet marks scope and authority, chartreuse marks the single live significance.

### Density

Low-to-medium with generous 24-64px pauses, compact mono metadata rows, and at least one quiet zone per major viewport.

### Signature

- The engraved rule: a graduated measurement rail (major and minor ticks) anchors the chrome of every surface.
- The chartreuse vernier: exactly one index per scale carries the signal colour, marking the live reading.
- Violet jaws: selected tabs, current scope, and primary actions are filled violet capsules.
- Clamped readouts: values render in monospace aligned to the rule, with one chartreuse delta when live.
- Quiet focus: keyboard focus is a 2px violet ring, never a glowing neon halo.

## Layout

### Grid

Engaged left rule rail (~88px) plus a fluid reading column; the embodiment and dashboard pair a dominant stage with narrow violet instrument panels; mobile collapses to one column with the rail hidden.

### Whitespace

Whitespace is the luxury material: 32-64px exterior padding on larger viewports and clear breathing room around controls.

### Density

Low-to-medium; one open quiet zone per major viewport.

### Responsive

Renders well from 390px mobile to 2560px+ ultra-wide; single column on mobile, non-essential nav and table columns drop, never overflows; content capped and centred on ultra-wide while only the hero spans 100vw.

### Breakpoints

- **Mobile**: 390px
- **Tablet**: 768px
- **Desktop**: 1200px
- **Wide**: 1440px
- **Max Content**: 1240px

## Guidance

### Do

- Anchor structure to the engraved measurement rail and let readings sit on the scale.
- Use deep violet for active scope, selected controls, and primary product decisions.
- Use chartreuse for exactly one live index per scale - the reading, threshold, or decisive action.
- Build components from fine stone-violet hairlines, 16px radii, and precise mono metadata.

### Don't

- Do not add coloured side rails, dotted or grid backgrounds, gradient washes, or confetti.
- Do not add a third vivid accent system beyond violet and the restrained chartreuse signal.
- Do not let chartreuse flood a surface or become a fill; it is the live index only.
- Do not turn the bench into a generic analytics dashboard or rainbow component catalog.

### Accessibility

Warm ink on a graphite-violet ground meets high contrast; chartreuse is always paired with a label or shape, never carrying meaning by colour alone; focus is a visible 2px violet ring; body text 17px+, table rows 14.5px+; motion respects prefers-reduced-motion.

## Imagery Direction

### Pairs With

plinth

### Summary

Single machined precision-instrument subjects shot as museum object-study plates: filling the frame on a warm museum-white sweep, raking light from upper left, deep violet shadow, one thin chartreuse rim on a single lit edge.

### Subjects

- vernier caliper
- micrometer
- gauge block
- dial indicator
- machined bushing or shaft

### Usage

Hero is one commanding instrument full-bleed; the dark page veils it for legibility. No vitrines, frames, borders, text, or UI chrome on the plate.

---
version: "alpha"
name: "Caliper"
description: "Agent-curated design language exported from Katagami as DESIGN.md."
colors:
  bg: "#16131F"
  surface: "#1F1A2B"
  surface_2: "#272036"
  text: "#F2F0F6"
  muted: "#9B95AD"
  border: "#332B47"
  accent: "#7C4DDB"
  accent_deep: "#5A2EA6"
  on_accent: "#FFFFFF"
  signal: "#C9F24A"
  on_signal: "#16131F"
  success: "#9FD13A"
  warning: "#E0B33A"
  error: "#E0586A"
  info: "#8A7BD8"
typography:
  headline-lg:
    fontFamily: "Space Grotesk"
    fontSize: "1.929rem"
    fontWeight: 700
    lineHeight: 1.1
    letterSpacing: "-0.02em"
  headline-md:
    fontFamily: "Space Grotesk"
    fontSize: "1.581rem"
    fontWeight: 600
    lineHeight: 1.15
    letterSpacing: "-0.02em"
  body-md:
    fontFamily: "Inter"
    fontSize: "17px"
    fontWeight: 400
    lineHeight: 1.55
    letterSpacing: "-0.02em"
  label-md:
    fontFamily: "Space Mono"
    fontSize: "0.75rem"
    fontWeight: 600
    lineHeight: 1
    letterSpacing: "0.08em"
rounded:
  none: "0px"
  card: "16px"
  lg: "24px"
  pill: "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_deep:
    backgroundColor: "{colors.accent_deep}"
  color-reference-on_accent:
    backgroundColor: "{colors.on_accent}"
  color-reference-signal:
    backgroundColor: "{colors.signal}"
  color-reference-on_signal:
    backgroundColor: "{colors.on_signal}"
  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: "#ffffff"
    typography: "{typography.label-md}"
    rounded: "{rounded.lg}"
    padding: "{spacing.md}"
  card-surface:
    backgroundColor: "{colors.surface}"
    textColor: "{colors.text}"
    rounded: "{rounded.lg}"
    padding: "{spacing.md}"
  input-default:
    backgroundColor: "{colors.surface}"
    textColor: "{colors.text}"
    rounded: "{rounded.lg}"
    height: "44px"
---

# Caliper

## Overview

A dark precision-metrology interface. The page behaves like the beam of a measuring caliper: gradations run its full length, values are clamped to the scale, deep violet jaws set scope, and a single chartreuse vernier marks the one live reading. Nothing glows that is not being measured.

### Values

- The product reading is the hero; structure is the engraved rule, not chrome.
- Deep violet is supervisory authority: selected scope, active controls, primary decisions.
- Chartreuse is one live index per scale only — under five percent of any surface.
- Restraint is the instrument: hairlines, space, and disciplined radii instead of colour fields.

### Anti-Values

- No rainbow UI, coloured side rails, stripe accents, dotted or grid textures, gradient washes, or confetti.
- No casual neon; chartreuse never floods a surface or becomes a fill or background.
- No glow without a reading, no rail without a measurement, no arbitrary mixed radii.

### Visual Character

- Graphite-violet near-black ground with neutrals tuned cool to the violet temperature.
- An engraved measurement rail (major and minor ticks) anchors the chrome of every surface.
- A single chartreuse vernier index marks the live reading, threshold, or decisive action.
- Violet capsule jaws frame scope and primary actions; monospace readouts clamp to the rule.
- Dark flat panels defined by stone-violet hairlines, never coloured edges or rails.

## 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 | `#16131F` |
| surface | `#1F1A2B` |
| surface_2 | `#272036` |
| text | `#F2F0F6` |
| muted | `#9B95AD` |
| border | `#332B47` |
| accent | `#7C4DDB` |
| accent_deep | `#5A2EA6` |
| on_accent | `#FFFFFF` |
| signal | `#C9F24A` |
| on_signal | `#16131F` |
| success | `#9FD13A` |
| warning | `#E0B33A` |
| error | `#E0586A` |
| info | `#8A7BD8` |

## Typography

- **Headline-Lg**: Space Grotesk, 1.929rem, weight 700, line-height 1.1.
- **Headline-Md**: Space Grotesk, 1.581rem, weight 600, line-height 1.15.
- **Body-Md**: Inter, 17px, weight 400, line-height 1.55.
- **Label-Md**: Space 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

Engaged left rule rail (~88px) plus a fluid reading column; the embodiment and dashboard pair a dominant stage with narrow violet instrument panels; mobile collapses to one column with the rail hidden.

### Whitespace

Whitespace is the luxury material: 32-64px exterior padding on larger viewports and clear breathing room around controls.

### Density

Low-to-medium; one open quiet zone per major viewport.

### Responsive

Renders well from 390px mobile to 2560px+ ultra-wide; single column on mobile, non-essential nav and table columns drop, never overflows; content capped and centred on ultra-wide while only the hero spans 100vw.

### Breakpoints

- **Mobile**: 390px
- **Tablet**: 768px
- **Desktop**: 1200px
- **Wide**: 1440px
- **Max Content**: 1240px

## Elevation & Depth

### Shadows

- **Sm**: 0 1px 2px rgba(0,0,0,0.4)
- **Md**: 0 18px 44px rgba(0,0,0,0.45)
- **Lg**: 0 40px 100px rgba(0,0,0,0.55)

## Shapes

### Rounded

- **None**: `0px`
- **Card**: `16px`
- **Lg**: `24px`
- **Pill**: `9999px`

### Surfaces

- **Bg Pattern**: No dots, no grid; the ground is an uninterrupted graphite-violet field. The only repeating mark is the engraved measurement rail.
- **Card Style**: Flat dark panels, 16px radius, a single 1px stone-violet hairline, restrained shadow only when elevated.
- **Treatment**: Dark graphite-violet planes with hairline structure; chartreuse never washes a surface.

### Borders

- **Default Width**: 1px
- **Accent Width**: 1.5px
- **Style**: solid
- **Character**: Stone-violet hairlines for structure; violet only for selected outlines and focus, chartreuse only for the live vernier index, never decorative rails.

## Components

### Composition

A reading column anchored to an engraved measurement rail; a large measured stage offsets compact violet instrument clusters, never a generic dashboard grid.

### Hierarchy

Hierarchy is scale, weight, and isolation; violet marks scope and authority, chartreuse marks the single live significance.

### Density

Low-to-medium with generous 24-64px pauses, compact mono metadata rows, and at least one quiet zone per major viewport.

### Signature

- The engraved rule: a graduated measurement rail (major and minor ticks) anchors the chrome of every surface.
- The chartreuse vernier: exactly one index per scale carries the signal colour, marking the live reading.
- Violet jaws: selected tabs, current scope, and primary actions are filled violet capsules.
- Clamped readouts: values render in monospace aligned to the rule, with one chartreuse delta when live.
- Quiet focus: keyboard focus is a 2px violet ring, never a glowing neon halo.

## 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-019efac9-4f05-7e51-810f-28e0650bb3ec/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 Anchor structure to the engraved measurement rail and let readings sit on the scale.
- Do Use deep violet for active scope, selected controls, and primary product decisions.
- Do Use chartreuse for exactly one live index per scale - the reading, threshold, or decisive action.
- Do Build components from fine stone-violet hairlines, 16px radii, and precise mono metadata.
- Don't Do not add coloured side rails, dotted or grid backgrounds, gradient washes, or confetti.
- Don't Do not add a third vivid accent system beyond violet and the restrained chartreuse signal.
- Don't Do not let chartreuse flood a surface or become a fill; it is the live index only.
- Don't Do not turn the bench into a generic analytics dashboard or rainbow component catalog.

### Accessibility

Warm ink on a graphite-violet ground meets high contrast; chartreuse is always paired with a label or shape, never carrying meaning by colour alone; focus is a visible 2px violet ring; body text 17px+, table rows 14.5px+; motion respects prefers-reduced-motion.

## Imagery Direction

### Pairs With

plinth

### Summary

Single machined precision-instrument subjects shot as museum object-study plates: filling the frame on a warm museum-white sweep, raking light from upper left, deep violet shadow, one thin chartreuse rim on a single lit edge.

### Subjects

- vernier caliper
- micrometer
- gauge block
- dial indicator
- machined bushing or shaft

### Usage

Hero is one commanding instrument full-bleed; the dark page veils it for legibility. No vitrines, frames, borders, text, or UI chrome on the plate.

```json
{
  "$schema": "https://ui.shadcn.com/schema/registry-item.json",
  "name": "caliper",
  "type": "registry:theme",
  "title": "Caliper shadcn Theme",
  "cssVars": {
    "theme": {},
    "light": {
      "background": "#16131F",
      "foreground": "#F2F0F6",
      "card": "#1F1A2B",
      "card-foreground": "#F2F0F6",
      "popover": "#1F1A2B",
      "popover-foreground": "#F2F0F6",
      "primary": "#F2F0F6",
      "primary-foreground": "#111111",
      "secondary": "#f4f4f5",
      "secondary-foreground": "#111111",
      "muted": "#9B95AD",
      "muted-foreground": "#F2F0F6",
      "accent": "#7C4DDB",
      "accent-foreground": "#ffffff",
      "destructive": "#E0586A",
      "border": "#332B47",
      "input": "#332B47",
      "ring": "#7C4DDB",
      "chart-1": "#F2F0F6",
      "chart-2": "#f4f4f5",
      "chart-3": "#7C4DDB",
      "chart-4": "#9FD13A",
      "chart-5": "#E0B33A",
      "sidebar": "#1F1A2B",
      "sidebar-foreground": "#F2F0F6",
      "sidebar-primary": "#F2F0F6",
      "sidebar-primary-foreground": "#111111",
      "sidebar-accent": "#8A7BD8",
      "sidebar-accent-foreground": "#ffffff",
      "sidebar-border": "#332B47",
      "sidebar-ring": "#7C4DDB",
      "radius": "24px"
    },
    "dark": {
      "background": "#0f1115",
      "foreground": "#f8fafc",
      "card": "#181b22",
      "card-foreground": "#f8fafc",
      "popover": "#181b22",
      "popover-foreground": "#f8fafc",
      "primary": "#F2F0F6",
      "primary-foreground": "#111111",
      "secondary": "#252a33",
      "secondary-foreground": "#f8fafc",
      "muted": "#252a33",
      "muted-foreground": "#a1a1aa",
      "accent": "#7C4DDB",
      "accent-foreground": "#ffffff",
      "destructive": "#E0586A",
      "border": "#303642",
      "input": "#303642",
      "ring": "#7C4DDB",
      "chart-1": "#F2F0F6",
      "chart-2": "#f4f4f5",
      "chart-3": "#7C4DDB",
      "chart-4": "#9FD13A",
      "chart-5": "#E0B33A",
      "sidebar": "#181b22",
      "sidebar-foreground": "#f8fafc",
      "sidebar-primary": "#F2F0F6",
      "sidebar-primary-foreground": "#111111",
      "sidebar-accent": "#7C4DDB",
      "sidebar-accent-foreground": "#ffffff",
      "sidebar-border": "#303642",
      "sidebar-ring": "#7C4DDB",
      "radius": "24px"
    }
  },
  "meta": {
    "source": "katagami",
    "languageId": "en-019efac9-4f05-7e51-810f-28e0650bb3ec",
    "slug": "caliper",
    "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_deep",
        "bg",
        "border",
        "error",
        "info",
        "muted",
        "on_accent",
        "on_signal",
        "signal",
        "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",
        "scale_ratio"
      ],
      "radii": [
        "card",
        "lg",
        "none",
        "pill"
      ],
      "shadows": [
        "lg",
        "md",
        "sm"
      ],
      "spacing": [
        "base",
        "scale"
      ],
      "surfaces": [
        "bg_pattern",
        "card_style",
        "treatment"
      ],
      "borders": [
        "accent_width",
        "character",
        "default_width",
        "style"
      ],
      "motion": [
        "duration",
        "easing",
        "philosophy"
      ]
    }
  }
}
```