# UI-08 — Theme migration to Modern Professional Dark

**Depends on** nothing · **Size** S · **Status** Not started

## Goal
Replace `theme.dart`'s current safety-orange palette with "Modern Professional Dark" —
the design system actually backing every fetched Stitch screen — so every screen ticket
in this set has one settled palette to build against instead of guessing or patching
colors per screen.

## Context
V3-16 (last shipped) deliberately kept and refined the original safety-orange-on-warm-
charcoal identity, with an instrument-blue tertiary for reference readings. That work is
good and tested, but it is **not** the palette the Stitch mockups use — confirmed by
hex-matching every color in the four fetched screens' HTML against all three design
systems in the Stitch project (`docs/design/stitch-export/README.md`). If this redesign
ships, V3-16's direction is superseded, not extended.

Full spec: `docs/design/stitch-export/design-system-modern-professional-dark.md`.

## Design
- **Ground:** deep dark gray `#0a0a0c` (not pure black — "a true premium feel without
  the harshness of pure black," per the design system's own doc), stepped up through
  `#131313` (surface) and `#16161a` (cards) for elevation.
- **Primary:** Professional Blue — rendered as `#4090fe` (container) / `#aac7ff`
  (on-dark-surface primary) / `#002f64` (on-primary text). This replaces safety-orange as
  *the* accent everywhere: live telemetry, active nav indicator, primary buttons,
  the user's own location dot.
- **Secondary/tertiary:** muted slate-blue (`#aec7f6`/`#2e476f`) and a warm orange
  (`#ffb68c`/`#e3711f`) reserved for tertiary accents (the design system's own spec
  doesn't define a strict "reference vs. live" split the way V3-16's tertiary did —
  decide during implementation whether to keep that instinct using this palette's
  secondary color, or drop it; either is defensible, but pick one and apply it
  consistently rather than leaving it ambiguous per screen).
- **Typography:** Inter, exclusively, for every role (headline/body/label) — this drops
  the multi-font split V3-16 and the original theme used (monospace for numbers via
  `monoDigits` is a separate, orthogonal decision from V3-16 worth keeping regardless of
  which color palette wins, since "digits must not jitter" is a real constraint, not a
  branding choice — retain `monoDigits` layered under Inter-family theming).
- **Shape:** 8px rounding (`ROUND_EIGHT`), up from the current 4px.
- **Depth:** tonal layering + a soft blue glow on elevated/active elements, no shadows —
  matches V3-16's existing "no shadows, translucency for depth" instinct, just with a
  different accent color for the glow.
- **Contrast:** the design system's own doc claims AAA-level contrast for functional
  text against the dark backdrop — verify this the same way V3-16 did (a
  `contrastRatio()` helper and real assertions), don't take the claim on faith.

## Implementation
1. Update `theme.dart`'s `ripprColors`/`ColorScheme` to the Modern Professional Dark
   values (ground, surface, cards, primary/secondary/tertiary, outline).
2. Update `bodyFont`/`headlineFont`/`labelFont` to Inter throughout; keep `monoDigits` as
   a distinct style applied specifically to numeric displays, unchanged in spirit from
   today.
3. Update `roundness` usage (button/card corner radii) from 4px to 8px.
4. Re-run V3-16's `contrastRatio()` assertions against the new palette; adjust any color
   that fails AA before shipping, exactly as V3-16 did for the palette it replaces.
5. Decide and document the reference-vs-live color convention (see Design) rather than
   leaving V3-16's tertiary-for-reference-readings instinct undecided under the new
   palette.
6. **Mounted mode (V3-05) needs its own pass**, not an automatic inheritance — it's a
   separate high-contrast daylight theme with its own palette, tuned against a real
   sunlight/visor constraint. Confirm it still holds up in spirit (still legible, still
   AA-compliant) under the new brand direction; V3-13's real-ride verification is still
   the only way to confirm the *actual* sunlight legibility claim, same caveat V3-16
   already recorded.

## Acceptance criteria
- [ ] `ripprColors` matches Modern Professional Dark's token values
- [ ] Every screen using `Theme.of(context).colorScheme` picks up the new palette with
      no per-screen hardcoded color left over from the old theme
- [ ] `contrastRatio()` assertions pass against the new palette (AA normal/large, same
      thresholds V3-16 established)
- [ ] `monoDigits` still applies to every numeric display
- [ ] Mounted mode re-verified against the new brand direction

## Tests
- All of V3-16's `theme_test.dart` contrast assertions, re-pointed at the new color
  values, still pass
- The existing black-on-black regression guard (`text is legible against the dark
  ground`) still passes
- Widget: a representative sample of screens render with the new palette (no leftover
  hardcoded orange/old-tertiary-blue literals)

## Risks
- **Regressing the black-on-black guard is the named risk V3-16 itself called out** —
  this ticket touches the same `textTheme`/`bodyColor`/`displayColor` wiring that bug
  came from originally. Do not remove the explicit color-naming discipline while
  restyling.
- Grep for hardcoded hex literals from the old palette (`0xFFFF5722` and friends) across
  the UI layer before considering this done — a few call sites (e.g. `RideMap`'s speed
  gradient) reference specific hex values directly rather than through the theme, and
  those need a deliberate decision, not an accidental miss.

## Out of scope
Any screen-specific redesign (UI-05/06/07) — this ticket only changes the token layer
those screens then build against.