Platen

# Platen

## Philosophy

Platen runs an operational queue the way a teleprinter runs paper: every record is a fixed-pitch strip threaded over the drum, separated by a perforation, and read by one carriage line. The single record under the read-head is the only thing lit; everything else stays in sepia carbon on warm manila continuous-feed paper. A reimagination of the enterprise mono-grid concept — serious instruments, monochrome discipline, one reserved signal — reconceived around a paper-transport metaphor: structure comes from the sprocket feed, the fixed pitch, the perforation and the carriage, not from a ruled drafting grid or cards with edges.

### Values

- operational clarity carried by the transport and by typography, never by colour
- one record read at a time — the carriage marks the single decision in play
- dense information made legible by a shared fixed pitch and tabular numerals
- structure from the sprocket feed and the perforation, not from borders or shadows

### Anti-Values

- floating cards with a colour pasted on an edge
- rounded consumer-app softness, pastel washes, or decorative motion
- the signal spread across every strip until it stops meaning anything
- defaulting the ground to white or to a cool drafting grey

### Visual Character

- A tractor-feed sprocket margin runs the length of every major region; its fixed hole pitch (34px) sets the rhythm of the whole page so readouts, records and charts share one cadence.
- Records are separated by a dashed perforation tear-line rather than a border; cleared work is torn off the roll while held work stays threaded above the carriage.
- Exactly one record wears a horizontal teal read-head line and a small READ tag at the left margin — the record being read — and charts lift exactly one column to the same teal.
- Squared Archivo headlines and big tabular numerals pair with Azeret Mono record fields and sequence numbers; hard typographic contrast and line-printer cadence establish hierarchy so colour never has to.
- Everything sits on warm manila feed paper in sepia carbon ink, with faint horizontal feed-lines across the whole surface, evoking continuous-form computer paper rather than a cool drafting table.

## Tokens

### Colors

| Name | Value |
|------|-------|
| bg | `#e7dcc2` |
| bg_deep | `#ddd0b2` |
| surface | `#f4ecd8` |
| surface_2 | `#efe5cd` |
| text | `#2c2418` |
| muted | `#7c6f57` |
| faint | `#a99c80` |
| border | `#c5b690` |
| accent | `#0e7c86` |
| accent_deep | `#0a5c64` |
| on_accent | `#f4ecd8` |
| primary | `#0e7c86` |
| secondary | `#7c6f57` |
| background | `#e7dcc2` |
| success | `#3f7a3a` |
| warning | `#b07a1f` |
| error | `#b23a2a` |
| info | `#0e7c86` |

### Typography

- **Base Size**: 17px
- **Body Font**: Azeret Mono
- **Heading Font**: Archivo
- **Mono Font**: Azeret Mono
- **Heading Weight**: 800
- **Heading Transform**: uppercase
- **Letter Spacing**: 0.005em
- **Scale Ratio**: 1.25
- **Line Height**: 1.5
- **Google Fonts Url**: https://fonts.googleapis.com/css2?family=Archivo:wght@500;600;700;800;900&family=Azeret+Mono:wght@400;500;600;700&display=swap

### Radii

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

### Shadows

- **Sm**: 0 1px 0 rgba(44,36,24,.10)
- **Md**: 0 8px 22px rgba(44,36,24,.10)
- **Lg**: 0 18px 44px rgba(44,36,24,.14)

### Spacing

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

### Surfaces

- **Treatment**: warm-manila-continuous-feed-paper
- **Card Style**: Flat record strips on lighter manila with sprocket-feed margins and dashed perforation tear-lines between records; section headers are uppercase label strips with a feed rule, never a shadow or accent edge.
- **Bg Pattern**: feed-lines

### Borders

- **Default Width**: 1px
- **Accent Width**: 2px
- **Style**: solid
- **Character**: Warm hairline feed rules and dashed perforation tear-lines carry separation; the only 2px line is the single teal carriage read-head. Never a single decorative accent edge, never a heavy border.

### Motion

- **Duration**: 180ms
- **Easing**: cubic-bezier(0.2, 0.7, 0, 1)
- **Philosophy**: Snappy and additive; the settled fully-rendered state is the no-JS default, reveals layered on top behind a class set on <html>, the hero ticker scrolls live form state at feed speed, all disabled under prefers-reduced-motion.

## Rules

### Composition

Compose every screen as a vertical fanfold stack of full-width record strips threaded between sprocket-feed margins, separated by dashed perforations; the landing opens on a full-viewport platen-mechanism schematic with a solid sepia overlay plate lower-left, and the dashboard is one continuous console with a breathing nav rail — never a rails-plus-center-plus-inspector workspace.

### Hierarchy

Use uppercase Archivo label strips and oversized tabular numerals for strategic summary, and Azeret Mono record fields and sequence numbers for transactional detail; the transport plus typographic contrast carries hierarchy.

### Density

High-density but controlled — fixed-pitch record strips, compact rows, the perforation carrying separation so borders are rare; numeric columns are tabular and aligned like line-printer output.

### Signature

A tractor-feed sprocket margin and a fixed 34px pitch run through every region; records tear at a dashed perforation; and across tables and charts exactly one element wears the teal read-head (the active record, the one chart peak, the focus ring), so the eye lands on the single thing in play.

## Layout

### Grid

Single-column vertical fanfold of full-width record strips at a fixed feed pitch; readouts and charts split into equal minmax(0,1fr) columns that share the same pitch.

### Whitespace

Generous padding above every title; the sprocket margins and feed-line texture do the structural work so interiors stay calm.

### Density

high

### Responsive

Strips stay full-width and stack; readout grids collapse 4->2->1; sprocket margins narrow on mobile; nothing overflows horizontally; ultra-wide caps and centres the contained content while only the hero spans 100vw.

### Breakpoints

- **Mobile**: 390px
- **Tablet**: 760px
- **Desktop**: 1180px
- **Ultrawide**: 2560px

## Guidance

### Do

- Reserve the teal for the one record / one chart peak / focus state.
- Let the sprocket feed and dashed perforation carry structure; pad above every title.
- Use tabular numerals and align numeric columns like line-printer output.
- Keep the warm manila ground and sepia ink consistent across all artifacts.

### Don't

- Don't add a second accent or paste teal on every strip.
- Don't give any region a single decorative accent edge, nest cards, or box the nav into a pill.
- Don't default the ground to white or shift it cool.
- Don't use emoji on buttons or symbol glyphs in copy.

### Accessibility

Body 17px+ sepia carbon on manila clears AA; the teal signal is reinforced by the READ tag and position, never carried by colour alone; every form control is explicitly styled with a teal focus ring; motion respects prefers-reduced-motion and the no-JS state is fully rendered.

## Imagery Direction

### Pairs With

bluework

### Summary

Subjects rendered as precise orthographic engineering schematics in fine graphite hairline ink over a faint square measurement grid, with exactly one analytical element lifted in electric signal. The landing hero is a teleprinter platen and tractor-feed mechanism — the machine that makes the moving roll — read in that technique, the mechanism weighted left with open ruled feed-paper at the right and one teal read-head line crossing the paper.

### Subjects

- teleprinter platen and tractor-feed mechanism
- continuous-form paper roll and sprocket drive
- line-printer carriage assembly
- exploded feed-roller and pin-belt detail
- ribbon and print-head transport

### Usage

Full-viewport landing hero driven by background-image: var(--hero-image); the schematic fills the frame with the measurement grid as substrate, the mechanism weighted to the left two-thirds and a solid sepia overlay plate carrying the headline in the lower-left.

---
version: "alpha"
name: "Platen"
description: "Agent-curated design language exported from Katagami as DESIGN.md."
colors:
  bg: "#e7dcc2"
  bg_deep: "#ddd0b2"
  surface: "#f4ecd8"
  surface_2: "#efe5cd"
  text: "#2c2418"
  muted: "#7c6f57"
  faint: "#a99c80"
  border: "#c5b690"
  accent: "#0e7c86"
  accent_deep: "#0a5c64"
  on_accent: "#f4ecd8"
  primary: "#0e7c86"
  secondary: "#7c6f57"
  background: "#e7dcc2"
  success: "#3f7a3a"
  warning: "#b07a1f"
  error: "#b23a2a"
  info: "#0e7c86"
typography:
  headline-lg:
    fontFamily: "Archivo"
    fontSize: "2.075rem"
    fontWeight: 700
    lineHeight: 1.1
    letterSpacing: "0.005em"
  headline-md:
    fontFamily: "Archivo"
    fontSize: "1.66rem"
    fontWeight: 600
    lineHeight: 1.15
    letterSpacing: "0.005em"
  body-md:
    fontFamily: "Azeret Mono"
    fontSize: "17px"
    fontWeight: 400
    lineHeight: 1.5
    letterSpacing: "0.005em"
  label-md:
    fontFamily: "Azeret 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-bg:
    backgroundColor: "{colors.bg}"
  color-reference-bg_deep:
    backgroundColor: "{colors.bg_deep}"
  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-faint:
    backgroundColor: "{colors.faint}"
  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-primary:
    backgroundColor: "{colors.primary}"
  color-reference-secondary:
    backgroundColor: "{colors.secondary}"
  color-reference-background:
    backgroundColor: "{colors.background}"
  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.primary}"
    textColor: "#ffffff"
    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"
---

# Platen

## Overview

Platen runs an operational queue the way a teleprinter runs paper: every record is a fixed-pitch strip threaded over the drum, separated by a perforation, and read by one carriage line. The single record under the read-head is the only thing lit; everything else stays in sepia carbon on warm manila continuous-feed paper. A reimagination of the enterprise mono-grid concept — serious instruments, monochrome discipline, one reserved signal — reconceived around a paper-transport metaphor: structure comes from the sprocket feed, the fixed pitch, the perforation and the carriage, not from a ruled drafting grid or cards with edges.

### Values

- operational clarity carried by the transport and by typography, never by colour
- one record read at a time — the carriage marks the single decision in play
- dense information made legible by a shared fixed pitch and tabular numerals
- structure from the sprocket feed and the perforation, not from borders or shadows

### Anti-Values

- floating cards with a colour pasted on an edge
- rounded consumer-app softness, pastel washes, or decorative motion
- the signal spread across every strip until it stops meaning anything
- defaulting the ground to white or to a cool drafting grey

### Visual Character

- A tractor-feed sprocket margin runs the length of every major region; its fixed hole pitch (34px) sets the rhythm of the whole page so readouts, records and charts share one cadence.
- Records are separated by a dashed perforation tear-line rather than a border; cleared work is torn off the roll while held work stays threaded above the carriage.
- Exactly one record wears a horizontal teal read-head line and a small READ tag at the left margin — the record being read — and charts lift exactly one column to the same teal.
- Squared Archivo headlines and big tabular numerals pair with Azeret Mono record fields and sequence numbers; hard typographic contrast and line-printer cadence establish hierarchy so colour never has to.
- Everything sits on warm manila feed paper in sepia carbon ink, with faint horizontal feed-lines across the whole surface, evoking continuous-form computer paper rather than a cool drafting table.

## 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 | `#e7dcc2` |
| bg_deep | `#ddd0b2` |
| surface | `#f4ecd8` |
| surface_2 | `#efe5cd` |
| text | `#2c2418` |
| muted | `#7c6f57` |
| faint | `#a99c80` |
| border | `#c5b690` |
| accent | `#0e7c86` |
| accent_deep | `#0a5c64` |
| on_accent | `#f4ecd8` |
| primary | `#0e7c86` |
| secondary | `#7c6f57` |
| background | `#e7dcc2` |
| success | `#3f7a3a` |
| warning | `#b07a1f` |
| error | `#b23a2a` |
| info | `#0e7c86` |

## Typography

- **Headline-Lg**: Archivo, 2.075rem, weight 700, line-height 1.1.
- **Headline-Md**: Archivo, 1.66rem, weight 600, line-height 1.15.
- **Body-Md**: Azeret Mono, 17px, weight 400, line-height 1.5.
- **Label-Md**: Azeret 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

Single-column vertical fanfold of full-width record strips at a fixed feed pitch; readouts and charts split into equal minmax(0,1fr) columns that share the same pitch.

### Whitespace

Generous padding above every title; the sprocket margins and feed-line texture do the structural work so interiors stay calm.

### Density

high

### Responsive

Strips stay full-width and stack; readout grids collapse 4->2->1; sprocket margins narrow on mobile; nothing overflows horizontally; ultra-wide caps and centres the contained content while only the hero spans 100vw.

### Breakpoints

- **Mobile**: 390px
- **Tablet**: 760px
- **Desktop**: 1180px
- **Ultrawide**: 2560px

## Elevation & Depth

### Shadows

- **Sm**: 0 1px 0 rgba(44,36,24,.10)
- **Md**: 0 8px 22px rgba(44,36,24,.10)
- **Lg**: 0 18px 44px rgba(44,36,24,.14)

## Shapes

### Rounded

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

### Surfaces

- **Treatment**: warm-manila-continuous-feed-paper
- **Card Style**: Flat record strips on lighter manila with sprocket-feed margins and dashed perforation tear-lines between records; section headers are uppercase label strips with a feed rule, never a shadow or accent edge.
- **Bg Pattern**: feed-lines

### Borders

- **Default Width**: 1px
- **Accent Width**: 2px
- **Style**: solid
- **Character**: Warm hairline feed rules and dashed perforation tear-lines carry separation; the only 2px line is the single teal carriage read-head. Never a single decorative accent edge, never a heavy border.

## Components

### Composition

Compose every screen as a vertical fanfold stack of full-width record strips threaded between sprocket-feed margins, separated by dashed perforations; the landing opens on a full-viewport platen-mechanism schematic with a solid sepia overlay plate lower-left, and the dashboard is one continuous console with a breathing nav rail — never a rails-plus-center-plus-inspector workspace.

### Hierarchy

Use uppercase Archivo label strips and oversized tabular numerals for strategic summary, and Azeret Mono record fields and sequence numbers for transactional detail; the transport plus typographic contrast carries hierarchy.

### Density

High-density but controlled — fixed-pitch record strips, compact rows, the perforation carrying separation so borders are rare; numeric columns are tabular and aligned like line-printer output.

### Signature

A tractor-feed sprocket margin and a fixed 34px pitch run through every region; records tear at a dashed perforation; and across tables and charts exactly one element wears the teal read-head (the active record, the one chart peak, the focus ring), so the eye lands on the single thing in play.

## 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-019efa8b-32c0-7511-a7a1-7b02e3f983af/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 Reserve the teal for the one record / one chart peak / focus state.
- Do Let the sprocket feed and dashed perforation carry structure; pad above every title.
- Do Use tabular numerals and align numeric columns like line-printer output.
- Do Keep the warm manila ground and sepia ink consistent across all artifacts.
- Don't Don't add a second accent or paste teal on every strip.
- Don't Don't give any region a single decorative accent edge, nest cards, or box the nav into a pill.
- Don't Don't default the ground to white or shift it cool.
- Don't Don't use emoji on buttons or symbol glyphs in copy.

### Accessibility

Body 17px+ sepia carbon on manila clears AA; the teal signal is reinforced by the READ tag and position, never carried by colour alone; every form control is explicitly styled with a teal focus ring; motion respects prefers-reduced-motion and the no-JS state is fully rendered.

## Imagery Direction

### Pairs With

bluework

### Summary

Subjects rendered as precise orthographic engineering schematics in fine graphite hairline ink over a faint square measurement grid, with exactly one analytical element lifted in electric signal. The landing hero is a teleprinter platen and tractor-feed mechanism — the machine that makes the moving roll — read in that technique, the mechanism weighted left with open ruled feed-paper at the right and one teal read-head line crossing the paper.

### Subjects

- teleprinter platen and tractor-feed mechanism
- continuous-form paper roll and sprocket drive
- line-printer carriage assembly
- exploded feed-roller and pin-belt detail
- ribbon and print-head transport

### Usage

Full-viewport landing hero driven by background-image: var(--hero-image); the schematic fills the frame with the measurement grid as substrate, the mechanism weighted to the left two-thirds and a solid sepia overlay plate carrying the headline in the lower-left.

```json
{
  "$schema": "https://ui.shadcn.com/schema/registry-item.json",
  "name": "platen",
  "type": "registry:theme",
  "title": "Platen shadcn Theme",
  "cssVars": {
    "theme": {},
    "light": {
      "background": "#e7dcc2",
      "foreground": "#2c2418",
      "card": "#f4ecd8",
      "card-foreground": "#2c2418",
      "popover": "#f4ecd8",
      "popover-foreground": "#2c2418",
      "primary": "#0e7c86",
      "primary-foreground": "#ffffff",
      "secondary": "#7c6f57",
      "secondary-foreground": "#ffffff",
      "muted": "#7c6f57",
      "muted-foreground": "#2c2418",
      "accent": "#0e7c86",
      "accent-foreground": "#ffffff",
      "destructive": "#b23a2a",
      "border": "#c5b690",
      "input": "#c5b690",
      "ring": "#0e7c86",
      "chart-1": "#0e7c86",
      "chart-2": "#7c6f57",
      "chart-3": "#0e7c86",
      "chart-4": "#3f7a3a",
      "chart-5": "#b07a1f",
      "sidebar": "#f4ecd8",
      "sidebar-foreground": "#2c2418",
      "sidebar-primary": "#0e7c86",
      "sidebar-primary-foreground": "#ffffff",
      "sidebar-accent": "#0e7c86",
      "sidebar-accent-foreground": "#ffffff",
      "sidebar-border": "#c5b690",
      "sidebar-ring": "#0e7c86",
      "radius": "0"
    },
    "dark": {
      "background": "#0f1115",
      "foreground": "#f8fafc",
      "card": "#181b22",
      "card-foreground": "#f8fafc",
      "popover": "#181b22",
      "popover-foreground": "#f8fafc",
      "primary": "#0e7c86",
      "primary-foreground": "#ffffff",
      "secondary": "#252a33",
      "secondary-foreground": "#f8fafc",
      "muted": "#252a33",
      "muted-foreground": "#a1a1aa",
      "accent": "#0e7c86",
      "accent-foreground": "#ffffff",
      "destructive": "#b23a2a",
      "border": "#303642",
      "input": "#303642",
      "ring": "#0e7c86",
      "chart-1": "#0e7c86",
      "chart-2": "#7c6f57",
      "chart-3": "#0e7c86",
      "chart-4": "#3f7a3a",
      "chart-5": "#b07a1f",
      "sidebar": "#181b22",
      "sidebar-foreground": "#f8fafc",
      "sidebar-primary": "#0e7c86",
      "sidebar-primary-foreground": "#ffffff",
      "sidebar-accent": "#0e7c86",
      "sidebar-accent-foreground": "#ffffff",
      "sidebar-border": "#303642",
      "sidebar-ring": "#0e7c86",
      "radius": "0"
    }
  },
  "meta": {
    "source": "katagami",
    "languageId": "en-019efa8b-32c0-7511-a7a1-7b02e3f983af",
    "slug": "platen",
    "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",
        "background",
        "bg",
        "bg_deep",
        "border",
        "error",
        "faint",
        "info",
        "muted",
        "on_accent",
        "primary",
        "secondary",
        "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": [
        "full",
        "lg",
        "md",
        "none",
        "sm"
      ],
      "shadows": [
        "lg",
        "md",
        "sm"
      ],
      "spacing": [
        "base",
        "scale"
      ],
      "surfaces": [
        "bg_pattern",
        "card_style",
        "treatment"
      ],
      "borders": [
        "accent_width",
        "character",
        "default_width",
        "style"
      ],
      "motion": [
        "duration",
        "easing",
        "philosophy"
      ]
    }
  }
}
```