app/(app)/create/hooks/usePreviewSurfaceColor.ts

@@ -0,0 +1,41 @@
+"use client";
+
+import { useEffect, useState } from "react";
+import {
+  dominantColorFromImageUrl,
+  randomPreviewSurfaceColor,
+} from "../../../../lib/create/previewSurfaceColor";
+
+/**
+ * Fill for the review preview card. An uploaded logo contributes its most
+ * common color; no image uses a random light color. Unset until mount so the
+ * server and client share the fallback class.
+ *
+ * @param imageUrl Uploaded logo URL, or `null` when the user skipped the photo.
+ * @returns A CSS color, or `undefined` before the client picks one.
+ */
+export function usePreviewSurfaceColor(
+  imageUrl: string | null,
+): string | undefined {
+  const [color, setColor] = useState<string | undefined>(undefined);
+
+  useEffect(() => {
+    if (!imageUrl) {
+      // eslint-disable-next-line react-hooks/set-state-in-effect -- random fill is client-only; first paint stays on the fallback class
+      setColor(randomPreviewSurfaceColor());
+      return;
+    }
+
+    let cancelled = false;
+    void dominantColorFromImageUrl(imageUrl).then((next) => {
+      if (cancelled) return;
+      setColor(next ?? randomPreviewSurfaceColor());
+    });
+
+    return () => {
+      cancelled = true;
+    };
+  }, [imageUrl]);
+
+  return color;
+}

app/(app)/create/screens/review/FinalReviewScreen.tsx

@@ -26,6 +26,7 @@ import {
 } from "../../components/FinalReviewChipEditModal";
 import { FinalReviewCommunityContextEditModal } from "../../components/FinalReviewCommunityContextEditModal";
 import { FinalReviewTitleEditModal } from "../../components/FinalReviewTitleEditModal";
+import { usePreviewSurfaceColor } from "../../hooks/usePreviewSurfaceColor";
 import { useCreateFlowNavigation } from "../../hooks/useCreateFlowNavigation";
 import { createFlowStepForFacetGroup } from "../../utils/facetGroupToCreateFlowStep";
 import {
@@ -234,6 +235,13 @@ export function FinalReviewScreen({
   const descriptionEmptyHint =
     variant === "editPublished" ? t("communityContextEditModal.emptyHint") : undefined;
 
+  const avatarUrl =
+    typeof state.communityAvatarUrl === "string" &&
+    state.communityAvatarUrl.trim().length > 0
+      ? state.communityAvatarUrl.trim()
+      : null;
+  const surfaceColor = usePreviewSurfaceColor(avatarUrl);
+
   return (
     <CreateFlowLockupCardStepShell
       lockupTitle={
@@ -271,8 +279,10 @@ export function FinalReviewScreen({
         }
         size={mdUp ? "L" : "M"}
         expanded={true}
+        descriptionAtBottom
         backgroundColor="bg-[var(--color-surface-invert-brand-teal)]"
-        logoUrl={getAssetPath(vectorMarkPath("mutual-aid"))}
+        surfaceColor={surfaceColor}
+        logoUrl={avatarUrl ?? getAssetPath(vectorMarkPath("mutual-aid"))}
         logoAlt={ruleCardTitle}
         categories={finalReviewCategories}
         className={CREATE_FLOW_REVIEW_RULE_LAYOUT_CLASS}

app/components/cards/Rule/Rule.container.tsx

@@ -49,6 +49,8 @@ const RuleContainer = memo<RuleProps>(
     recommended = false,
     templateGridFigmaShell = false,
     fluidWidth = false,
+    descriptionAtBottom = false,
+    surfaceColor,
   }) => {
     const size = sizeProp ?? "L";
     const t = useTranslation("ruleCard");
@@ -112,6 +114,8 @@ const RuleContainer = memo<RuleProps>(
         recommended={recommended}
         templateGridFigmaShell={templateGridFigmaShell}
         fluidWidth={fluidWidth}
+        descriptionAtBottom={descriptionAtBottom}
+        surfaceColor={surfaceColor}
         cardAriaLabel={cardAriaLabel}
         recommendedLabel={recommendedLabel}
       />

app/components/cards/Rule/Rule.types.ts

@@ -84,6 +84,16 @@ export interface RuleProps {
   templateGridFigmaShell?: boolean;
   /** When true, expanded cards fill their container instead of a fixed Figma width. */
   fluidWidth?: boolean;
+  /**
+   * Expanded cards: pin the description under the category rows (review preview).
+   * Default keeps the description between the header and the categories.
+   */
+  descriptionAtBottom?: boolean;
+  /**
+   * Runtime CSS color for the card fill. When set, it overrides
+   * {@link backgroundColor}.
+   */
+  surfaceColor?: string;
 }
 
 export interface RuleViewProps {
@@ -113,6 +123,8 @@ export interface RuleViewProps {
   recommended?: boolean;
   templateGridFigmaShell?: boolean;
   fluidWidth?: boolean;
+  descriptionAtBottom?: boolean;
+  surfaceColor?: string;
   /** Interactive card aria-label; supplied by the container from `ruleCard` messages. */
   cardAriaLabel: string;
   recommendedLabel: string;

app/components/cards/Rule/Rule.view.tsx

@@ -35,6 +35,8 @@ export function RuleView({
   recommended = false,
   templateGridFigmaShell = false,
   fluidWidth = false,
+  descriptionAtBottom = false,
+  surfaceColor,
   cardAriaLabel,
   recommendedLabel,
 }: RuleViewProps) {
@@ -267,8 +269,58 @@ export function RuleView({
   }
 
   const cardClassName = `${backgroundColor} ${cardPadding} ${cardGap} ${borderRadiusClass} shadow-[0px_0px_48px_0px_rgba(0,0,0,0.1)] ${interactiveCard ? "hover:shadow-[0px_0px_64px_0px_rgba(0,0,0,0.15)] transition-shadow duration-200" : ""} flex flex-col items-start justify-center relative ${cardWidth || "w-full"} ${href ? "no-underline text-inherit" : ""} ${className || ""}`;
+  const surfaceStyle = surfaceColor
+    ? { backgroundColor: surfaceColor }
+    : undefined;
   const isLinkCard = Boolean(href) && interactiveCard;
 
+  const hasCategories = Boolean(categories && categories.length > 0);
+  const expandedDescriptionFrameClass = [
+    "relative w-full shrink-0",
+    hasCategories
+      ? descriptionAtBottom
+        ? "border-t border-solid border-[var(--color-content-invert-primary)] pt-[16px]"
+        : "border-b border-solid border-[var(--color-content-invert-primary)] pb-[16px]"
+      : "",
+    isLarge || isMedium ? "px-0" : "px-[12px]",
+  ]
+    .filter(Boolean)
+    .join(" ");
+
+  const showExpandedDescription = Boolean(
+    description ||
+    (onDescriptionClick && typeof descriptionEmptyHint === "string"),
+  );
+  const expandedDescription = showExpandedDescription ? (
+    <div className={expandedDescriptionFrameClass}>
+      {onDescriptionClick ? (
+        <InlineTextButton
+          type="button"
+          underline={false}
+          data-testid="rule-description-edit"
+          ariaLabel={descriptionEditAriaLabel}
+          className={`${descriptionClass} w-full min-w-0 cursor-pointer whitespace-pre-wrap text-left text-[var(--color-content-invert-primary)] hover:!opacity-100 ${
+            !description && descriptionEmptyHint ? "opacity-70" : ""
+          }`.trim()}
+          onClick={(e) => {
+            e.stopPropagation();
+            onDescriptionClick();
+          }}
+        >
+          {description ?? descriptionEmptyHint ?? ""}
+        </InlineTextButton>
+      ) : (
+        description && (
+          <p
+            className={`${descriptionClass} cursor-inherit text-[var(--color-content-invert-primary)]`}
+          >
+            {description}
+          </p>
+        )
+      )}
+    </div>
+  ) : null;
+
   const cardBody = (
     <>
       {/* Figma: Header = `border-b` row, `gap-px`, icon `pl-1 pr-2 py-2` + `border-l` on title. */}
@@ -382,43 +434,7 @@ export function RuleView({
         </div>
       ) : expanded ? (
         <>
-          {(description ||
-            (onDescriptionClick &&
-              typeof descriptionEmptyHint === "string")) && (
-            <div
-              className={`relative w-full shrink-0 ${
-                categories && categories.length > 0
-                  ? "border-b border-solid border-[var(--color-content-invert-primary)] pb-[16px]"
-                  : ""
-              } ${expanded && (isLarge || isMedium) ? "px-0" : "px-[12px]"}`}
-            >
-              {onDescriptionClick ? (
-                <InlineTextButton
-                  type="button"
-                  underline={false}
-                  data-testid="rule-description-edit"
-                  ariaLabel={descriptionEditAriaLabel}
-                  className={`${descriptionClass} w-full min-w-0 cursor-pointer whitespace-pre-wrap text-left text-[var(--color-content-invert-primary)] hover:!opacity-100 ${
-                    !description && descriptionEmptyHint ? "opacity-70" : ""
-                  }`.trim()}
-                  onClick={(e) => {
-                    e.stopPropagation();
-                    onDescriptionClick();
-                  }}
-                >
-                  {description ?? descriptionEmptyHint ?? ""}
-                </InlineTextButton>
-              ) : (
-                description && (
-                  <p
-                    className={`${descriptionClass} cursor-inherit text-[var(--color-content-invert-primary)]`}
-                  >
-                    {description}
-                  </p>
-                )
-              )}
-            </div>
-          )}
+          {descriptionAtBottom ? null : expandedDescription}
           {/* Categories Section - Using MultiSelect */}
           {categories && categories.length > 0 && (
             <div
@@ -459,6 +475,7 @@ export function RuleView({
               ))}
             </div>
           )}
+          {descriptionAtBottom ? expandedDescription : null}
         </>
       ) : (
         /* Collapsed State: Description */
@@ -488,6 +505,7 @@ export function RuleView({
       <NextLink
         href={href}
         className={cardClassName}
+        style={surfaceStyle}
         aria-label={ariaLabel}
         onClick={onClick}
       >
@@ -499,6 +517,7 @@ export function RuleView({
   return (
     <div
       className={cardClassName}
+      style={surfaceStyle}
       tabIndex={interactiveCard ? 0 : undefined}
       role={interactiveCard ? "button" : "article"}
       aria-label={ariaLabel}
@@ -510,4 +529,3 @@ export function RuleView({
     </div>
   );
 }
-

lib/create/previewSurfaceColor.ts

@@ -0,0 +1,181 @@
+const QUANTIZE_SHIFT = 4;
+/** Ignore only fully clear pixels so a translucent logo fill still counts. */
+const MIN_ALPHA = 16;
+/** Black card type needs a light fill. Dark logo colors are lifted to this. */
+const CARD_FILL_LIGHTNESS = 0.82;
+const CARD_FILL_MAX_SATURATION = 0.48;
+
+function rgbToHsl(
+  r: number,
+  g: number,
+  b: number,
+): { h: number; s: number; l: number } {
+  const rn = r / 255;
+  const gn = g / 255;
+  const bn = b / 255;
+  const max = Math.max(rn, gn, bn);
+  const min = Math.min(rn, gn, bn);
+  const l = (max + min) / 2;
+  if (max === min) return { h: 0, s: 0, l };
+  const d = max - min;
+  const s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
+  let h = 0;
+  if (max === rn) h = (gn - bn) / d + (gn < bn ? 6 : 0);
+  else if (max === gn) h = (bn - rn) / d + 2;
+  else h = (rn - gn) / d + 4;
+  return { h: h / 6, s, l };
+}
+
+function hueChannel(p: number, q: number, t: number): number {
+  let channel = t;
+  if (channel < 0) channel += 1;
+  if (channel > 1) channel -= 1;
+  if (channel < 1 / 6) return p + (q - p) * 6 * channel;
+  if (channel < 1 / 2) return q;
+  if (channel < 2 / 3) return p + (q - p) * (2 / 3 - channel) * 6;
+  return p;
+}
+
+function hslToRgb(h: number, s: number, l: number): [number, number, number] {
+  if (s === 0) {
+    const value = Math.round(l * 255);
+    return [value, value, value];
+  }
+  const q = l < 0.5 ? l * (1 + s) : l + s - l * s;
+  const p = 2 * l - q;
+  return [
+    Math.round(hueChannel(p, q, h + 1 / 3) * 255),
+    Math.round(hueChannel(p, q, h) * 255),
+    Math.round(hueChannel(p, q, h - 1 / 3) * 255),
+  ];
+}
+
+/**
+ * Keep an already-light logo color. Lift a dark one to a pale tint of the
+ * same hue so the card’s black type stays readable.
+ */
+export function readableCardFill(r: number, g: number, b: number): string {
+  const { h, s, l } = rgbToHsl(r, g, b);
+  if (l >= 0.7) return `rgb(${r}, ${g}, ${b})`;
+  const [rr, gg, bb] = hslToRgb(
+    h,
+    Math.min(s, CARD_FILL_MAX_SATURATION),
+    CARD_FILL_LIGHTNESS,
+  );
+  return `rgb(${rr}, ${gg}, ${bb})`;
+}
+
+/**
+ * Most common opaque color in `data` (RGBA). Nearby shades share a bucket
+ * so a logo’s main fill wins over anti-aliased edges. Returns `null` when
+ * every pixel is transparent.
+ */
+export function mostCommonOpaqueColor(data: Uint8ClampedArray): string | null {
+  const buckets = new Map<
+    number,
+    { count: number; r: number; g: number; b: number }
+  >();
+
+  for (let i = 0; i < data.length; i += 4) {
+    const alpha = data[i + 3] ?? 0;
+    if (alpha < MIN_ALPHA) continue;
+    const r = data[i] ?? 0;
+    const g = data[i + 1] ?? 0;
+    const b = data[i + 2] ?? 0;
+    const key =
+      ((r >> QUANTIZE_SHIFT) << 8) |
+      ((g >> QUANTIZE_SHIFT) << 4) |
+      (b >> QUANTIZE_SHIFT);
+    const bucket = buckets.get(key);
+    if (bucket) {
+      bucket.count += 1;
+      bucket.r += r;
+      bucket.g += g;
+      bucket.b += b;
+    } else {
+      buckets.set(key, { count: 1, r, g, b });
+    }
+  }
+
+  let best: { count: number; r: number; g: number; b: number } | null = null;
+  for (const bucket of buckets.values()) {
+    if (!best || bucket.count > best.count) best = bucket;
+  }
+  if (!best || best.count === 0) return null;
+
+  const r = Math.round(best.r / best.count);
+  const g = Math.round(best.g / best.count);
+  const b = Math.round(best.b / best.count);
+  return `rgb(${r}, ${g}, ${b})`;
+}
+
+/**
+ * Light random fill. Hue is free; lightness stays high so the card’s black
+ * type remains readable.
+ */
+export function randomPreviewSurfaceColor(
+  random: () => number = Math.random,
+): string {
+  const hue = Math.floor(random() * 360);
+  const saturation = 50 + Math.floor(random() * 35);
+  const lightness = 76 + Math.floor(random() * 12);
+  return `hsl(${hue}, ${saturation}%, ${lightness}%)`;
+}
+
+function imageNeedsCors(url: string): boolean {
+  if (
+    url.startsWith("/") ||
+    url.startsWith("blob:") ||
+    url.startsWith("data:")
+  ) {
+    return false;
+  }
+  try {
+    return new URL(url, window.location.href).origin !== window.location.origin;
+  } catch {
+    return false;
+  }
+}
+
+function loadImage(url: string): Promise<HTMLImageElement | null> {
+  return new Promise((resolve) => {
+    const img = new Image();
+    img.onload = () => resolve(img);
+    img.onerror = () => resolve(null);
+    if (imageNeedsCors(url)) img.crossOrigin = "anonymous";
+    img.src = url;
+  });
+}
+
+/** Downscale `url` and return its most common opaque color, or `null`. */
+export async function dominantColorFromImageUrl(
+  url: string,
+): Promise<string | null> {
+  if (typeof window === "undefined") return null;
+  const img = await loadImage(url);
+  if (!img) return null;
+
+  const size = 32;
+  const canvas = document.createElement("canvas");
+  canvas.width = size;
+  canvas.height = size;
+  const context = canvas.getContext("2d", { willReadFrequently: true });
+  if (!context) return null;
+  context.drawImage(img, 0, 0, size, size);
+
+  try {
+    const raw = mostCommonOpaqueColor(
+      context.getImageData(0, 0, size, size).data,
+    );
+    if (!raw) return null;
+    const match = raw.match(/^rgb\((\d+), (\d+), (\d+)\)$/);
+    if (!match) return raw;
+    return readableCardFill(
+      Number(match[1]),
+      Number(match[2]),
+      Number(match[3]),
+    );
+  } catch {
+    return null;
+  }
+}

tests/components/FinalReviewPage.test.tsx

@@ -122,6 +122,43 @@ describe("FinalReviewScreen", () => {
     ).toBeInTheDocument();
   });
 
+  it("places the group description under the category rows", async () => {
+    render(
+      <FinalReviewWithFlowState
+        title="Oak Park Commons"
+        communityContext="Local mutual aid."
+      />,
+    );
+    const description = await screen.findByText(/Local mutual aid\./i);
+    expect(
+      screen.getByText("Values").compareDocumentPosition(description) &
+        Node.DOCUMENT_POSITION_FOLLOWING,
+    ).not.toBe(0);
+    expect(description.parentElement).toHaveClass("border-t");
+  });
+
+  it("uses a random light background when no logo is uploaded", async () => {
+    render(
+      <FinalReviewWithFlowState
+        title="Oak Park Commons"
+        communityContext="Local mutual aid."
+      />,
+    );
+    await waitFor(() => {
+      const card = screen.getByRole("button", { name: /Oak Park Commons/i });
+      const raw = card.style.backgroundColor;
+      expect(raw).toMatch(/^rgb\(\d+, \d+, \d+\)$/);
+      const channels = raw
+        .split(/[^\d]+/)
+        .filter(Boolean)
+        .map(Number);
+      const lightness =
+        (Math.max(...channels) + Math.min(...channels)) / 2 / 255;
+      expect(lightness).toBeGreaterThanOrEqual(0.74);
+      expect(lightness).toBeLessThanOrEqual(0.9);
+    });
+  });
+
   it("renders Rule as a button (card is interactive)", () => {
     render(<FinalReviewScreen />);
     const buttons = screen.getAllByRole("button");

tests/components/FinalReviewPreviewSurface.test.tsx

@@ -0,0 +1,48 @@
+import { useLayoutEffect } from "react";
+import { describe, expect, it, vi } from "vitest";
+import { waitFor } from "@testing-library/react";
+import { renderWithProviders as render, screen } from "../utils/test-utils";
+import "@testing-library/jest-dom/vitest";
+import { FinalReviewScreen } from "../../app/(app)/create/screens/review/FinalReviewScreen";
+import { useCreateFlow } from "../../app/(app)/create/context/CreateFlowContext";
+import { dominantColorFromImageUrl } from "../../lib/create/previewSurfaceColor";
+
+vi.mock("../../lib/create/previewSurfaceColor", async (importOriginal) => {
+  const actual =
+    await importOriginal<
+      typeof import("../../lib/create/previewSurfaceColor")
+    >();
+  return {
+    ...actual,
+    dominantColorFromImageUrl: vi.fn(async () => "rgb(12, 80, 40)"),
+  };
+});
+
+function FinalReviewWithAvatar() {
+  const { replaceState } = useCreateFlow();
+  useLayoutEffect(() => {
+    replaceState({
+      title: "Oak Park Commons",
+      communityContext: "Local mutual aid.",
+      communityAvatarUrl: "/api/uploads/avatar-1",
+    });
+  }, [replaceState]);
+  return <FinalReviewScreen />;
+}
+
+describe("Final review preview surface", () => {
+  it("fills the card from the uploaded logo’s most common color", async () => {
+    render(<FinalReviewWithAvatar />);
+
+    await waitFor(() => {
+      const card = screen.getByRole("button", { name: /Oak Park Commons/i });
+      expect(card).toHaveStyle({ backgroundColor: "rgb(12, 80, 40)" });
+    });
+    expect(vi.mocked(dominantColorFromImageUrl)).toHaveBeenCalledWith(
+      "/api/uploads/avatar-1",
+    );
+    expect(
+      screen.getByRole("img", { name: "Oak Park Commons" }),
+    ).toHaveAttribute("src", expect.stringContaining("avatar-1"));
+  });
+});

tests/unit/Rule.test.jsx

@@ -257,11 +257,49 @@ describe("Rule Component", () => {
         ],
       },
     ];
-    render(
-      <Rule {...defaultProps} expanded={true} categories={categories} />,
-    );
+    render(<Rule {...defaultProps} expanded={true} categories={categories} />);
 
     expect(screen.getByText("Values")).toBeInTheDocument();
+    const description = screen.getByText("This is a test rule description");
+    expect(
+      description.compareDocumentPosition(screen.getByText("Values")) &
+        Node.DOCUMENT_POSITION_FOLLOWING,
+    ).not.toBe(0);
+    expect(description.parentElement).toHaveClass("border-b");
+  });
+
+  it("pins the description under categories when descriptionAtBottom is set", () => {
+    const categories = [
+      {
+        name: "Values",
+        chipOptions: [
+          { id: "v1", label: "Consciousness", state: "unselected" },
+        ],
+      },
+    ];
+    render(
+      <Rule
+        {...defaultProps}
+        expanded={true}
+        descriptionAtBottom
+        categories={categories}
+      />,
+    );
+
+    const description = screen.getByText("This is a test rule description");
+    expect(
+      screen.getByText("Values").compareDocumentPosition(description) &
+        Node.DOCUMENT_POSITION_FOLLOWING,
+    ).not.toBe(0);
+    expect(description.parentElement).toHaveClass("border-t");
+    expect(description.parentElement).not.toHaveClass("border-b");
+  });
+
+  it("applies a runtime surface color over the background class", () => {
+    render(<Rule {...defaultProps} surfaceColor="rgb(12, 80, 40)" />);
+    expect(screen.getByRole("button")).toHaveStyle({
+      backgroundColor: "rgb(12, 80, 40)",
+    });
   });
 
   it("renders with logo URL", () => {

tests/unit/previewSurfaceColor.test.ts

@@ -0,0 +1,77 @@
+import { describe, expect, it } from "vitest";
+import {
+  mostCommonOpaqueColor,
+  randomPreviewSurfaceColor,
+  readableCardFill,
+} from "../../lib/create/previewSurfaceColor";
+
+function pixel(r: number, g: number, b: number, a = 255): number[] {
+  return [r, g, b, a];
+}
+
+describe("mostCommonOpaqueColor", () => {
+  it("returns the average of the largest quantized bucket", () => {
+    const data = new Uint8ClampedArray([
+      ...pixel(200, 10, 10),
+      ...pixel(201, 11, 9),
+      ...pixel(202, 9, 11),
+      ...pixel(10, 10, 220),
+    ]);
+
+    expect(mostCommonOpaqueColor(data)).toBe("rgb(201, 10, 10)");
+  });
+
+  it("ignores transparent pixels", () => {
+    const data = new Uint8ClampedArray([
+      ...pixel(255, 255, 255, 0),
+      ...pixel(255, 255, 255, 0),
+      ...pixel(20, 40, 60),
+    ]);
+
+    expect(mostCommonOpaqueColor(data)).toBe("rgb(20, 40, 60)");
+  });
+
+  it("returns null when nothing is opaque", () => {
+    const data = new Uint8ClampedArray([...pixel(1, 2, 3, 0)]);
+    expect(mostCommonOpaqueColor(data)).toBeNull();
+  });
+
+  it("counts a translucent fill", () => {
+    const data = new Uint8ClampedArray([...pixel(255, 0, 0, 127)]);
+    expect(mostCommonOpaqueColor(data)).toBe("rgb(255, 0, 0)");
+  });
+});
+
+describe("readableCardFill", () => {
+  it("keeps a light logo color", () => {
+    expect(readableCardFill(201, 254, 249)).toBe("rgb(201, 254, 249)");
+  });
+
+  it("lifts a dark logo color into a pale tint of the same hue", () => {
+    const fill = readableCardFill(255, 0, 0);
+    const channels = fill
+      .split(/[^\d]+/)
+      .filter(Boolean)
+      .map(Number);
+    const lightness =
+      (Math.max(...channels) + Math.min(...channels)) / 2 / 255;
+    expect(lightness).toBeGreaterThanOrEqual(0.8);
+    expect(channels[0]).toBeGreaterThan(channels[2]);
+  });
+});
+
+describe("randomPreviewSurfaceColor", () => {
+  it("stays in a light range so black type can sit on it", () => {
+    let call = 0;
+    const sequence = [0, 0, 0];
+    expect(randomPreviewSurfaceColor(() => sequence[call++] ?? 0)).toBe(
+      "hsl(0, 50%, 76%)",
+    );
+
+    call = 0;
+    const high = [0.999, 0.999, 0.999];
+    expect(randomPreviewSurfaceColor(() => high[call++] ?? 0)).toBe(
+      "hsl(359, 84%, 87%)",
+    );
+  });
+});