Gemini web app — theme import (pixel-exact)

The Gemini web app (https://gemini.google.com/app) ships a Material 3 token system under the --gem-sys-* namespace, plus a canvas/code layer under --lumi-sys-*. This note records the dark theme as captured live on 2026-05-22 by reading the cascaded computed values of those custom properties (functional token values — colours and corner radii).

• Full token sheet: tokens-system.css (175 system tokens).
• Captured body context: dark-theme zero-state-theme; body background #0f0f0f (= --lumi-sys-color--surface), body text #e3e3e3.
• The app also defines ~1700 --mat-* Angular Material component tokens; those are derived from the system layer and are intentionally not vendored.

Defining palette at a glance (dark)

Role	Gemini value
primary	#a8c7fa
primary-container	#1f3760
secondary	#7fcfff
tertiary	#6dd58c
surface	#131314
surface-container	#1e1f20
surface-container-high(est)	#282a2c / #333537
on-surface	#e3e3e3
on-surface-variant	#c4c7c5
outline / outline-variant	#8e918f / #444746
error	#f2b8b5
brand text gradient	#4285f4 → #9b72cb
brand blue / green / red / yellow	#3186ff / #0ebc5f / #ff4641 / #ffcc00

The corner-radius scale (--gem-sys-shape--corner-*) matches the M3 Expressive 10-step scale now in m3-tokens shape.rs (none 0 → medium 12 → large 16 → large-increased 20 → extra-large 28 → extra-large-increased 32 → extra-extra-large 48 → full 9999), confirming our token update against a shipping Google product.

Mapping to aphrody m3-tokens ColorRoles

Drop-in dark scheme for crates/m3-tokens/src/color.rs (ARGB, opaque). The values are the captured --gem-sys-color--* roles; #035 shorthand is expanded to #003355, background/on_background mirror surface/on_surface.

/// Gemini web app dark scheme, captured pixel-exact 2026-05-22.
pub const GEMINI_DARK: ColorRoles = ColorRoles {
    primary: 0xFFA8C7FA,
    on_primary: 0xFF062E6F,
    primary_container: 0xFF1F3760,
    on_primary_container: 0xFFD3E3FD,
    secondary: 0xFF7FCFFF,
    on_secondary: 0xFF003355,
    secondary_container: 0xFF004A77,
    on_secondary_container: 0xFFC2E7FF,
    tertiary: 0xFF6DD58C,
    on_tertiary: 0xFF0A3818,
    tertiary_container: 0xFF0F5223,
    on_tertiary_container: 0xFFC4EED0,
    error: 0xFFF2B8B5,
    on_error: 0xFF601410,
    error_container: 0xFF601410,
    on_error_container: 0xFFF9DEDC,
    surface: 0xFF131314,
    on_surface: 0xFFE3E3E3,
    surface_variant: 0xFF444746,
    on_surface_variant: 0xFFC4C7C5,
    outline: 0xFF8E918F,
    outline_variant: 0xFF444746,
    background: 0xFF131314,
    on_background: 0xFFE3E3E3,
    inverse_surface: 0xFFE3E3E3,
    inverse_on_surface: 0xFF303030,
    inverse_primary: 0xFF0B57D0,
    scrim: 0xFF000000,
    shadow: 0xFF000000,
    // expanded surface tones
    surface_dim: 0xFF131314,
    surface_bright: 0xFF1E1F20,
    surface_container_lowest: 0xFF0E0E0E,
    surface_container_low: 0xFF1B1B1B,
    surface_container: 0xFF1E1F20,
    surface_container_high: 0xFF282A2C,
    surface_container_highest: 0xFF333537,
};

Wiring this const into color.rs is deferred until the in-flight edits to that file settle (it is being revised concurrently); the snippet is exact and ready to paste. Field order/names follow the current 36-field ColorRoles.