feat(design): M70 默认色候选 —— 浅冷天蓝落成两行常量 + 三档候选色卡
默认色从官方紫 `#6750A4` 换成「浅冷天蓝」，并把「换默认只改哪一行」做成常量： - `palettes::DEFAULT_SEED` = `#87CEEB`（CSS skyblue）+ `palettes::DEFAULT_NEUTRAL_CHROMA` = 12 - `Palettes::baseline()` / `Scheme::baseline()` = 产品默认（消费方拿到的就是它） - 官方口径锚点独立保留：`Palettes::official_baseline()` / `Scheme::official_baseline()` （种子 `#6750A4` + 中性 6），官方对齐测试改指向它，98 项仍每通道误差 0 - 新增 `Palettes::from_seed_with_neutral_chroma(seed, neutral_chroma)`：中性彩度从写死 常数变成入参（neutral-variant 按官方 +2 跟随），算法、tone 表、gamut 映射一行未动 有意偏离登记（已写进 color 模块文档）：中性彩度 6 → 12 是对官方 Tonal Spot 的偏离， 理由＝产品要冷调表面；primary 的 tone 被官方钉在 40，种子再浅也变不成浅蓝， 「浅」只能落在中性色上。 三档候选（同一条 HCT 管道，只差种子与中性彩度）逐个 pin 在 tests/skyseed_candidates.rs： ① 保守蓝 `#2196F3`/6、② 冷调蓝 `#2196F3`/12、③ 浅冷蓝 `#87CEEB`/12（临时默认，待用户确认）。 WCAG AA 扩到候选档：26 组 × 3 档 × 2 模式 = 156 项全绿，最紧 4.99:1。
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//! M70：默认色候选（保守蓝 / 冷调蓝 / 浅冷蓝）——三档的**唯一真源**与 pin。
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//!
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//! ## 这档候选到底改了什么
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//!
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//! 三档走的是**同一条** HCT 管道（`Palettes::from_seed_with_neutral_chroma` → `ColorSpec2021`
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//! tone 表 → `HctSolver` gamut 映射），差别只有两个入参：
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//!
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//! | 档 | 种子 | 中性调色板彩度 | 表面 |
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//! |---|---|---|---|
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//! | ① 保守蓝 | `#2196F3` | 6（官方） | 近白/近黑，几乎无色 |
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//! | ② 冷调蓝 | `#2196F3` | 12 | 冷白/冷黑，带淡蓝调 |
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//! | ③ 浅冷蓝 | `#87CEEB`（CSS `skyblue`） | 12 | 浅天蓝 |
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//!
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//! 两条必须知道的物理事实（写在测试里，免得下次又有人想「把主色调浅一点」）：
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//!
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//! 1. **种子彩度是废参数**：Tonal Spot 把 primary 彩度钉在 36，种子只贡献色相。
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//! 所以「低彩度天蓝种子」得到的色板与「高彩度天蓝种子」**逐像素相同**
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//! （`seed_chroma_never_leaks_into_the_primary_ramp` 在 `palettes.rs` 里也钉了这条）。
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//! ③ 与 ② 的真正差别是**色相**（226° vs 254°），不是彩度。
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//! 2. **primary 的 tone 被钉在 40**，所以三档主色都是「中蓝」，不会更浅。
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//! 「浅」只能落在中性色上——这就是②/③提高中性彩度的原因，也是本项目唯一一处
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//! 对官方 Tonal Spot 的**有意偏离**（登记在 `color` 模块文档的「出厂默认色」小节）。
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//!
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//! ## 换默认色要动哪里
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//!
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//! `palettes::DEFAULT_SEED` / `palettes::DEFAULT_NEUTRAL_CHROMA` 两行常量，
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//! 然后重跑本文件：pin 表会逐角色告诉你哪几个 hex 变了，照抄即可（pin 是**抄本**，不是推导）。
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use unlucky_design::color::{
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Color, Hct, Palettes, Role, Scheme, SchemeFlavor, DEFAULT_NEUTRAL_CHROMA, DEFAULT_SEED,
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};
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/// 一档候选：只有两个变量（种子 + 中性彩度），其余全是官方常数。
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struct Candidate {
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/// 短标签（色卡与 CSV 用）。
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tag: &'static str,
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/// 中文档名。
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title: &'static str,
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/// 种子 hex。
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seed_hex: &'static str,
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/// 中性调色板彩度（官方 Tonal Spot 是 6）。
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neutral_chroma: f64,
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/// 9 个展示角色的 **(角色, light, dark)** 抄本。
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pins: [(Role, &'static str, &'static str); 9],
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}
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/// 三档候选（色卡 `DevDocs/ops/skyseed-candidates/` 用的就是这份数据）。
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const CANDIDATES: [Candidate; 3] = [
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Candidate {
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tag: "C1",
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title: "① 保守蓝（中性彩度 6 = 官方）",
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seed_hex: "#2196F3",
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neutral_chroma: 6.0,
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pins: [
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(Role::Primary, "#36618E", "#A0CAFD"),
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(Role::OnPrimary, "#FFFFFF", "#003258"),
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(Role::PrimaryContainer, "#D1E4FF", "#194975"),
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(Role::Secondary, "#535F70", "#BBC7DB"),
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(Role::Tertiary, "#6B5778", "#D6BEE4"),
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(Role::Surface, "#F8F9FF", "#111418"),
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(Role::SurfaceContainerLow, "#F2F3FA", "#191C20"),
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(Role::SurfaceContainerHighest, "#E1E2E8", "#32353A"),
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(Role::Outline, "#73777F", "#8D9199"),
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],
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},
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Candidate {
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tag: "C2",
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title: "② 冷调蓝（中性彩度 12）",
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seed_hex: "#2196F3",
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neutral_chroma: 12.0,
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pins: [
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(Role::Primary, "#36618E", "#A0CAFD"),
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(Role::OnPrimary, "#FFFFFF", "#003258"),
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(Role::PrimaryContainer, "#D1E4FF", "#194975"),
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(Role::Secondary, "#535F70", "#BBC7DB"),
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(Role::Tertiary, "#6B5778", "#D6BEE4"),
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(Role::Surface, "#F8F9FF", "#0C141E"),
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(Role::SurfaceContainerLow, "#EEF4FF", "#141C26"),
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(Role::SurfaceContainerHighest, "#DBE3F1", "#2D3540"),
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(Role::Outline, "#6D7887", "#8791A1"),
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],
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},
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Candidate {
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tag: "C3",
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title: "③ 浅冷蓝（中性彩度 12 + 偏青天蓝种子）",
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seed_hex: "#87CEEB",
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neutral_chroma: 12.0,
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pins: [
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(Role::Primary, "#0C6780", "#89D0ED"),
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(Role::OnPrimary, "#FFFFFF", "#003544"),
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(Role::PrimaryContainer, "#BAEAFF", "#004D62"),
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(Role::Secondary, "#4C626B", "#B3CAD5"),
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(Role::Tertiary, "#5B5B7E", "#C4C3EB"),
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(Role::Surface, "#F3FAFF", "#07151B"),
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(Role::SurfaceContainerLow, "#E7F6FE", "#0F1D23"),
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(Role::SurfaceContainerHighest, "#D6E5ED", "#29373D"),
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(Role::Outline, "#687A82", "#81949C"),
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],
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},
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];
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/// 三档共同点：种子的 HCT 坐标（色相是候选之间**唯一**有效的差别）。
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fn seed_hct(candidate: &Candidate) -> Hct {
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Hct::from_color(Color::from_hex(candidate.seed_hex).expect("候选种子必须是合法 hex"))
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}
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/// 按候选参数走**产品同一条**派生路径。
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fn scheme(candidate: &Candidate, flavor: SchemeFlavor) -> Scheme {
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Scheme::from_palettes(
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&Palettes::from_seed_with_neutral_chroma(
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seed_hct(candidate).to_color(),
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candidate.neutral_chroma,
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),
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flavor,
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)
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}
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#[test]
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fn candidates_match_their_pins() {
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let mut drift = Vec::new();
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for candidate in &CANDIDATES {
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for (role, want_light, want_dark) in candidate.pins {
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for (flavor, want_hex) in [
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(SchemeFlavor::Light, want_light),
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(SchemeFlavor::Dark, want_dark),
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] {
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let got = scheme(candidate, flavor).get(role).to_hex();
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if got != want_hex {
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drift.push(format!(
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"{}{} / {}/{} 实测 {got}，pin {want_hex}",
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candidate.tag,
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if flavor.is_dark() { "-dark" } else { "" },
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candidate.title,
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role.name()
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));
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}
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}
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}
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}
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assert!(
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drift.is_empty(),
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"候选色值漂了（换默认色后请照抄下面这些 hex 到 pin 表）：\n{}",
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drift.join("\n")
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);
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}
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#[test]
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fn candidates_only_move_the_two_declared_inputs() {
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// 「不绕算法」的证据：三档的调色板彩度与官方 Tonal Spot 逐项一致，
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// 唯一的差别是中性彩度的入参（以及种子色相）。
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let official = Palettes::official_baseline();
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for candidate in &CANDIDATES {
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let p = Palettes::from_seed_with_neutral_chroma(
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seed_hct(candidate).to_color(),
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candidate.neutral_chroma,
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);
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assert_eq!(p.primary.chroma(), official.primary.chroma());
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assert_eq!(p.secondary.chroma(), official.secondary.chroma());
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assert_eq!(p.tertiary.chroma(), official.tertiary.chroma());
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assert_eq!(p.error, official.error, "error 族不该被候选影响");
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assert_eq!(p.neutral.chroma(), candidate.neutral_chroma);
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assert!(
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(p.tertiary.hue_deg() - (p.primary.hue_deg() + 60.0)).abs() < 1.0e-9,
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"{} 的 tertiary 不再是 +60°",
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candidate.tag
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);
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}
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}
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#[test]
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fn the_three_tiers_are_actually_distinguishable() {
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// 「三档不像同一档」的机器判据。注意 light 的 surface（tone 98）在 8 bit 下已经贴顶，
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// 中性彩度 6→12 会量化到同一个 #F8F9FF——所以判据落在 container 系与 dark 模式上，
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// 这也是色卡上 ①② 的差别主要体现在卡片/浮层与深色模式的原因。
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let light = |c: &Candidate| scheme(c, SchemeFlavor::Light);
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let dark = |c: &Candidate| scheme(c, SchemeFlavor::Dark);
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let (c1, c2, c3) = (
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light(&CANDIDATES[0]),
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light(&CANDIDATES[1]),
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light(&CANDIDATES[2]),
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);
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for role in [Role::SurfaceContainerLow, Role::SurfaceContainerHighest] {
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assert_ne!(
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c1.get(role),
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c2.get(role),
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"①与②的 {} 相同：中性彩度没起作用",
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role.name()
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);
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assert_ne!(c2.get(role), c3.get(role), "②与③的 {} 相同", role.name());
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}
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assert_ne!(
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dark(&CANDIDATES[0]).get(Role::Surface),
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dark(&CANDIDATES[1]).get(Role::Surface),
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"深色模式的 surface 应当能看出中性彩度差别"
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);
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let hue_gap = |a: &Candidate, b: &Candidate| {
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let (x, y) = (seed_hct(a).hue, seed_hct(b).hue);
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(x - y).abs().min(360.0 - (x - y).abs())
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};
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assert!(
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hue_gap(&CANDIDATES[0], &CANDIDATES[1]) < 0.01,
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"①② 应当只差中性彩度"
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);
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assert!(
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(10.0..=40.0).contains(&hue_gap(&CANDIDATES[1], &CANDIDATES[2])),
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"②③ 的色相差应当明显（10°~40°），实测 {}",
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hue_gap(&CANDIDATES[1], &CANDIDATES[2])
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);
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}
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#[test]
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fn product_default_is_the_recommended_candidate() {
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// ③ 是 M70 的**临时默认**（推荐档，待用户确认）。用户拍板后改这里会立刻红——
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// 那条红就是在提醒你同步 `DEFAULT_SEED` / `DEFAULT_NEUTRAL_CHROMA` 与上面的 pin。
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let recommended = &CANDIDATES[2];
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assert_eq!(
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DEFAULT_SEED,
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Color::from_hex(recommended.seed_hex).expect("合法 hex"),
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"DEFAULT_SEED 与推荐档 {}",
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recommended.tag
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);
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assert_eq!(DEFAULT_NEUTRAL_CHROMA, recommended.neutral_chroma);
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for flavor in [SchemeFlavor::Light, SchemeFlavor::Dark] {
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assert_eq!(
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Scheme::baseline(flavor),
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scheme(recommended, flavor),
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"产品默认（Scheme::baseline）必须等于推荐档的派生结果（{}）",
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flavor.name()
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);
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}
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}
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#[test]
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fn surface_tint_stays_a_tint() {
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// 门禁：中性彩度提高是「淡蓝调」不是「把窗口染成蓝纸」。surface 的 HCT 彩度必须
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// 明显低于 primary 的 36，且 surface 的 Y 仍 > 0.85（浅色模式还是浅底）。
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for candidate in &CANDIDATES {
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let light = scheme(candidate, SchemeFlavor::Light);
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let surface = light.get(Role::Surface);
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let chroma = Hct::from_color(surface).chroma;
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assert!(
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chroma <= 1.2 * candidate.neutral_chroma,
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"{} 的 surface 彩度 {chroma} 超过中性彩度入参的两倍",
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candidate.tag
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);
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assert!(surface.relative_luminance() > 0.85);
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}
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}
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#[test]
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fn dump_candidates_for_the_color_card() {
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// 色卡脚本读的就是这两行格式（`SEED|` / `ROLE|`）。跑法：
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// cargo test -p unlucky-design --test skyseed_candidates -- --nocapture
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for candidate in &CANDIDATES {
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let hct = seed_hct(candidate);
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println!(
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"SEED|{}|{}|{}|{}|hue={:.2}|chroma={:.2}",
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candidate.tag,
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candidate.title,
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candidate.seed_hex,
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candidate.neutral_chroma,
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hct.hue,
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hct.chroma
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);
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for flavor in [SchemeFlavor::Light, SchemeFlavor::Dark] {
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let s = scheme(candidate, flavor);
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for role in Role::ALL {
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println!(
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"ROLE|{}|{}|{}|{}",
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candidate.tag,
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flavor.name(),
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role.name(),
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s.get(role).to_hex().trim_start_matches('#')
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);
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}
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}
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}
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}
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