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+# Gribouille Scale Reference
+
+Full parameter reference for every scale family exported in `lib.typ`. All parameters verified against source code.
+
+Columns: **Scale** | **Aesthetic** | **Key params** | **When to use**
+
+---
+
+## Position scales — x axis
+
+| Scale | Aesthetic | Key params | When to use |
+|---|---|---|---|
+| `scale-x-continuous(name, limits, breaks, labels, transform: "identity", expand, secondary)` | x | `name`, `limits`, `breaks`, `labels`, `transform` | Override x axis ticks, labels, or limits |
+| `scale-x-log10(name, limits, breaks, labels)` | x | `name`, `breaks`, `labels` | Log₁₀ x axis; data must be positive |
+| `scale-x-sqrt(name, limits, breaks, labels)` | x | `name`, `breaks`, `labels` | Square-root x axis |
+| `scale-x-reverse(name, limits, breaks, labels)` | x | `name` | Reverse x direction |
+| `scale-x-binned(name, limits, n-breaks: 10, labels)` | x | `n-breaks`, `labels`, `limits` | Bin continuous x into discrete intervals |
+| `scale-x-discrete(name, limits, labels, expand)` | x | `limits` (reorder levels), `labels` | Force discrete x; reorder categories |
+| `scale-x-date(name, limits, breaks, labels, date-format, expand)` | x | `date-format` (Typst datetime.display pattern) | Date x axis; values as numeric days since 2000-01-01 or ISO-8601 strings |
+| `scale-x-datetime(...)` | x | same as `scale-x-date` | Datetime x axis |
+| `scale-x-time(...)` | x | same as `scale-x-date` | Time-of-day x axis |
+
+## Position scales — y axis
+
+| Scale | Aesthetic | Key params | When to use |
+|---|---|---|---|
+| `scale-y-continuous(name, limits, breaks, labels, transform: "identity", expand, secondary)` | y | same as `scale-x-continuous` | Override y axis |
+| `scale-y-log10(name, limits, breaks, labels)` | y | `name`, `breaks`, `labels` | Log₁₀ y axis |
+| `scale-y-sqrt(...)` | y | — | Square-root y axis |
+| `scale-y-reverse(...)` | y | — | Flip y direction |
+| `scale-y-binned(name, limits, n-breaks: 10, labels)` | y | `n-breaks`, `labels` | Bin continuous y |
+| `scale-y-discrete(name, limits, labels, expand)` | y | `limits`, `labels` | Force discrete y |
+| `scale-y-date(...)` | y | `date-format`, `limits`, `breaks` | Date y axis |
+| `scale-y-datetime(...)` | y | same | Datetime y axis |
+| `scale-y-time(...)` | y | same | Time-of-day y axis |
+
+---
+
+## Colour scales (discrete)
+
+| Scale | Aesthetic | Key params | When to use |
+|---|---|---|---|
+| `scale-colour-discrete(name, palette, limits, labels)` | colour | `palette` (array of colours or `auto`), `limits` | Custom discrete colour palette |
+| `scale-colour-manual(values, name, limits, labels)` | colour | `values` (array of colours or dict `level -> colour`) | Explicit named mapping |
+| `scale-colour-identity(name)` | colour | — | Colour column holds literal colour values |
+| `scale-colour-okabe-ito(name, limits, labels)` | colour | — | Colourblind-safe 8-colour discrete palette |
+| `scale-colour-hue(hue, chroma, luminance, name, limits, labels)` | colour | `hue` (range, e.g. `(15deg, 375deg)`), `chroma: 100`, `luminance: 65` | Hue-based palette; tune saturation |
+| `scale-colour-grey(start, end, name, limits, labels)` | colour | `start: 0.2`, `end: 0.8` (grey levels 0–1) | Greyscale discrete |
+| `scale-colour-brewer(palette, name, limits, labels)` | colour | `palette: "Set1"` (ColorBrewer palette name) | ColorBrewer palettes |
+
+## Colour scales (continuous)
+
+| Scale | Aesthetic | Key params | When to use |
+|---|---|---|---|
+| `scale-colour-continuous(name, palette, limits, breaks, labels)` | colour | `palette` (gradient or colour array) | Continuous colour from palette |
+| `scale-colour-gradient(low, high, name, limits, breaks, labels)` | colour | `low: rgb("#132B43")`, `high: rgb("#56B1F7")` | Simple two-colour gradient |
+| `scale-colour-gradient2(low, mid, high, midpoint, name, limits, breaks, labels)` | colour | `low`, `mid: white`, `high`, `midpoint: 0` | Diverging gradient centred at `midpoint` |
+| `scale-colour-gradientn(colours, name, limits, breaks, labels)` | colour | `colours` (array of 3+ colours) | Multi-stop gradient |
+| `scale-colour-distiller(palette, direction, name, limits, breaks, labels)` | colour | `palette: "Spectral"`, `direction: 1\|-1` | Brewer palettes interpolated to continuous |
+| `scale-colour-steps(low, high, n-breaks, name, limits, labels)` | colour | `low`, `high`, `n-breaks: 5` | Stepped two-colour gradient |
+| `scale-colour-steps2(low, mid, high, midpoint, n-breaks, name, limits, labels)` | colour | `low`, `mid: white`, `high`, `midpoint: 0`, `n-breaks: 5` | Stepped diverging gradient |
+| `scale-colour-stepsn(colours, n-breaks, name, limits, labels)` | colour | `colours`, `n-breaks: 5` | Stepped multi-stop gradient |
+| `scale-colour-fermenter(palette, n-breaks, direction, name, limits, labels)` | colour | `palette: "Spectral"`, `n-breaks: 5`, `direction: 1` | Brewer palettes cut into discrete bins |
+
+## Colour scales (viridis family)
+
+Supported `option` values: `"viridis"` (default), `"magma"`, `"plasma"`, `"inferno"`, `"cividis"`.
+
+| Scale | Aesthetic | Key params | When to use |
+|---|---|---|---|
+| `scale-colour-viridis-c(option, name, limits, breaks, labels)` | colour | `option: "viridis"` | Perceptually uniform continuous colour |
+| `scale-colour-viridis-d(option, name, limits, labels)` | colour | `option: "viridis"` | Perceptually uniform discrete colour |
+| `scale-colour-viridis-b(option, n-breaks, name, limits, labels)` | colour | `option: "viridis"`, `n-breaks: 5` | Perceptually uniform binned colour |
+
+## Fill scales
+
+Every colour scale above has an exact fill counterpart. Replace `colour` with `fill`:
+
+```
+scale-fill-discrete()         scale-fill-continuous()
+scale-fill-manual()           scale-fill-gradient()
+scale-fill-identity()         scale-fill-gradient2()
+scale-fill-okabe-ito()        scale-fill-gradientn()
+scale-fill-hue()              scale-fill-brewer()
+scale-fill-grey()             scale-fill-distiller()
+scale-fill-viridis-c()        scale-fill-fermenter()
+scale-fill-viridis-d()        scale-fill-steps()
+scale-fill-viridis-b()        scale-fill-steps2()
+                              scale-fill-stepsn()
+```
+
+---
+
+## Alpha scales
+
+| Scale | Aesthetic | Key params | When to use |
+|---|---|---|---|
+| `scale-alpha-continuous(name, range, limits, breaks, labels)` | alpha | `range: (0.1, 1)` | Map a continuous variable to transparency |
+| `scale-alpha-binned(n-breaks, range, name, limits, labels)` | alpha | `n-breaks: 4`, `range: (0.1, 1)` | Binned (stepped) alpha |
+| `scale-alpha-manual(values, name, limits, labels)` | alpha | `values` (array of 0–1 values) | Explicit alpha per level |
+| `scale-alpha-identity(name)` | alpha | — | Alpha column holds literal 0–1 values |
+
+---
+
+## Size scales
+
+| Scale | Aesthetic | Key params | When to use |
+|---|---|---|---|
+| `scale-size-continuous(name, range, limits, breaks, labels)` | size | `range: (1pt, 6pt)` | Map continuous var to point size |
+| `scale-radius(name, range, limits, breaks, labels)` | size | `range: (1pt, 6pt)` | Alias of `scale-size-continuous`; map to radius |
+| `scale-size-area(name, range, limits, breaks, labels)` | size | `range: (1pt, 6pt)` | Map to area (perceptually correct for magnitude) |
+| `scale-size-binned(n-breaks, range, name, limits, labels)` | size | `n-breaks: 4`, `range: (1pt, 6pt)` | Binned size scale |
+| `scale-size-binned-area(n-breaks, range, name, limits, labels)` | size | `n-breaks: 4`, `range: (1pt, 6pt)` | Binned area scale |
+| `scale-size-identity(name)` | size | — | Size column holds literal length values |
+| `scale-size-manual(values, name, limits, labels)` | size | `values` (array of lengths) | Explicit size per level |
+
+---
+
+## Linewidth scales
+
+| Scale | Aesthetic | Key params | When to use |
+|---|---|---|---|
+| `scale-linewidth-continuous(name, range, limits, breaks, labels)` | linewidth | `range: (0.4pt, 1.4pt)` | Map continuous var to line width |
+| `scale-linewidth-binned(n-breaks, range, name, limits, labels)` | linewidth | `n-breaks: 4`, `range: (0.4pt, 1.4pt)` | Binned linewidth |
+| `scale-linewidth-manual(values, name, limits, labels)` | linewidth | `values` (array of lengths) | Explicit linewidth per level |
+| `scale-linewidth-identity(name)` | linewidth | — | Linewidth column holds literal length values |
+
+---
+
+## Shape / linetype scales
+
+| Scale | Aesthetic | Key params | When to use |
+|---|---|---|---|
+| `scale-shape(name, palette, limits, labels)` | shape | `palette` (array of shape keywords or `auto`) | Discrete point shapes |
+| `scale-shape-manual(values, name, limits, labels)` | shape | `values` (array of shape keywords) | Explicit shape per level |
+| `scale-shape-identity(name)` | shape | — | Shape column holds literal keywords |
+| `scale-shape-binned(n-breaks, palette, name, limits, labels)` | shape | `n-breaks: 4`, `palette` | Binned shape scale |
+| `scale-linetype(name, palette, limits, labels)` | linetype | `palette` (array of dash keywords or `auto`) | Discrete line types |
+| `scale-linetype-manual(values, name, limits, labels)` | linetype | `values` (array of dash keywords) | Explicit linetype per level |
+| `scale-linetype-identity(name)` | linetype | — | Linetype column holds literal keywords |
+| `scale-linetype-binned(n-breaks, palette, name, limits, labels)` | linetype | `n-breaks: 4`, `palette` | Binned linetype scale (continuous var) |
+| `scale-linetype-continuous(name, palette, limits, labels)` | linetype | alias of `scale-linetype-binned(n-breaks: 4)` | Alias |
+| `scale-linetype-discrete(name, palette, limits, labels)` | linetype | alias of `scale-linetype()` | Alias |
+
+Shape keywords: `"circle"`, `"square"`, `"triangle"`, `"diamond"`, `"cross"`, `"x"`, `"star"`, `"triangle-down"`
+
+Linetype keywords: `"solid"`, `"dashed"`, `"dotted"`, `"dash-dotted"`, `"densely-dashed"`, `"loosely-dashed"`
+
+---
+
+## Format helpers (use in `labels:` parameter)
+
+| Function | Output example | Notes |
+|---|---|---|
+| `format-comma()` | 1,234,567 | Thousands separator; best for y-axis with large integers |
+| `format-percent()` | 12.3% | Multiply by 100 and append %; input should be 0–1 |
+| `format-scientific()` | 1.23×10⁴ | Scientific notation |
+| `format-currency()` | $1,234 | Dollar prefix + comma separator |
+| `format-number(digits: N)` | 3.14 | Fixed decimal places |
+| `format-lower()` | lowercase | Convert labels to lowercase |
+| `format-upper()` | UPPERCASE | Convert labels to uppercase |
+| `format-title()` | Title Case | Capitalise each word |
+| `format-wrap(width: N)` | wrapped text | Word-wrap long labels at N characters |
+
+---
+
+## Common patterns
+
+**Large y-axis numbers:**
+```typst
+scales: (scale-y-continuous(labels: format-comma()),)
+```
+
+**Log-log axes:**
+```typst
+scales: (scale-x-log10(), scale-y-log10(),)
+```
+
+**Custom discrete colour palette:**
+```typst
+scales: (
+  scale-colour-manual(
+    values: ("Setosa": rgb("#E69F00"), "Versicolor": rgb("#56B4E9"), "Virginica": rgb("#009E73")),
+    limits: ("Setosa", "Versicolor", "Virginica"),
+  ),
+)
+```
+
+**Colourblind-safe palette:**
+```typst
+scales: (scale-colour-okabe-ito(),)
+```
+
+**Viridis continuous fill for heatmap:**
+```typst
+scales: (scale-fill-viridis-c(option: "viridis"),)
+```
+
+**Diverging colour centred at zero:**
+```typst
+scales: (scale-colour-gradient2(low: blue, mid: white, high: red, midpoint: 0),)
+```
+
+**Reorder discrete x axis:**
+```typst
+scales: (scale-x-discrete(limits: ("small", "medium", "large")),)
+```
+
+**Date axis:**
+```typst
+scales: (scale-x-date(date-format: "[month repr:short] [year]"),)
+```
+
+**Size range for bubble chart:**
+```typst
+scales: (scale-size-area(range: (1pt, 12pt)),)
+```