Take the typescale's tracking from Compose, and reset roundness

Tracking now comes from androidx's TypeScaleTokens.kt as sp/16 rem, so Display
Large is -0.0125rem, Title Medium and Body Medium 0.0125rem where material-web's
pre-Expressive numbers stood. The emphasized set gets its own
--md-sys-typescale-emphasized-<style>-tracking, which the emphasized utilities
read: M3 widens four of them and takes Display Large back to zero. Every regular
utility sets `font-variation-settings: normal`, because the property inherits and
body copy inside an emphasized heading is meant to read as itself.

bin/check-font.mjs (fontkit) prints the packaged woff2's fvar axes, so a
re-subset cannot silently drop the ROND axis the emphasized styles depend on;
`npm run check:font` runs it and tests/Feature/FontTest.php runs it through the
configured node binary, skipping when node cannot run (PHP cannot open a woff2
without Brotli).

Plan: docs/plans/material-3-alignment.md step 4, findings core C5, C6, C7.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
This commit is contained in:
Andreas Reinhold / reini
2026-09-14 05:29:09 +02:00
co-authored by Claude Fable 5.1
parent b1fc0c9cfa
commit 2feb623ec0
7 changed files with 366 additions and 25 deletions
@@ -81,7 +81,7 @@ Tailwind's default palette is cleared: every colour class names an M3 role. `tex
- Colour roles (`bg-*`, `text-*`, `border-*`, …): `primary`, `on-primary`, `primary-container`, `on-primary-container`, `inverse-primary`, `primary-fixed`, `primary-fixed-dim`, `on-primary-fixed`, `on-primary-fixed-variant`; the same for `secondary` and `tertiary`; `error`, `on-error`, `error-container`, `on-error-container`; `success`, `warning` and `info` with their `on-`, `-container` and `on-…-container`; `inverse-error|success|warning|info`; `surface`, `surface-dim`, `surface-bright`, `surface-container-lowest|low||high|highest`, `on-surface`, `on-surface-variant`, `inverse-surface`, `inverse-on-surface`, `outline`, `outline-variant`, `scrim`, `shadow`; plus `white` and `black`.
- Ink and lines by meaning: `text-body` (body copy), `text-meta` (metadata), `text-quiet` (decoration only), `border-structure`, `border-chrome`, `border-divider` / `divide-divider`.
- Type: `type-{display|headline|title|body|label}-{lg|md|sm}` and `type-emphasized-…`. Never assemble `text-*`, `leading-*` and `tracking-*` by hand. The font is Google Sans Flex (`font-sans`).
- Type: `type-{display|headline|title|body|label}-{lg|md|sm}` and `type-emphasized-…` — M3's 15 styles and their emphasized twins, one weight step heavier, rounder, with their own tracking. Never assemble `text-*`, `leading-*` and `tracking-*` by hand; a utility carries size, line height and tracking together. Emphasis is deliberate and one element at a time (M3 asks for it on badges, primary buttons, selected rows, headlines), so a regular utility inside an emphasized one goes back to plain. The font is Google Sans Flex (`font-sans`).
- Shape: `rounded-corner-{none|xs|sm|md|lg|lg-increased|xl|xl-increased|xxl|full}`.
- Elevation: `shadow-elevation-{1…5}` — for what floats over content, not for panels (a panel separates by its container tone).
- Motion: `ease-spatial-{fast|default|slow}` (position, size, shape; springs that overshoot) and `ease-effects-{fast|default|slow}` (colour, opacity). Always pair an easing with its duration: `duration-(--md-sys-motion-spatial-fast-duration) ease-spatial-fast`. Reduced motion zeroes the durations.