diff --git a/README.md b/README.md
index 717521e..c38be5d 100644
--- a/README.md
+++ b/README.md
@@ -37,6 +37,36 @@ The browser only ever talks to this app. This app talks to Minnect server-side.
 That keeps your Minnect tokens off the browser entirely and avoids cross-origin
 restrictions. See `CLAUDE.md` and `docs/` (if present) for the design notes.
 
+## Design system
+
+The redesign (obsidian, crimson, no gold) is specified in
+[`docs/minnect-feed-redesign.spec.md`](docs/minnect-feed-redesign.spec.md). The
+styling decisions are in
+[`docs/adr/0001-redesign-styling-approach.md`](docs/adr/0001-redesign-styling-approach.md).
+The handoff for the redesign is [`docs/handoff-redesign.md`](docs/handoff-redesign.md).
+
+- **Themes.** Dark is the default; light is a toggle. The choice is stored in
+  `localStorage` and applied by a small script in `src/app/layout.tsx` before
+  first paint (`src/lib/theme.ts`), so there is no flash. `src/lib/use-theme.ts`
+  is the hook the toggles use.
+- **Tokens.** All colors are CSS custom properties in `src/app/globals.css`, one
+  set for dark and one for light. `--accent-text` is the readable crimson for
+  small text (4.5:1). Components use tokens only, never raw colors.
+- **Stylesheets.** One file per component area in `src/styles/` (`buttons.css`,
+  `feed.css`, `post.css`, `mobile.css` and so on), loaded from `globals.css`.
+- **Buttons.** Five styles plus a small icon button, all in
+  `src/components/Buttons.tsx`: Flip (the composer Post button), Grow (the
+  "new posts" pill), Sweep (outline actions: Try again, Cancel, expert search
+  chips), Depth (the Discover sheet rows), Sparkle (Sign in and the mobile dock
+  new-post button) and IconButton (refresh, comment send, delete confirm). Disabled buttons stay at full opacity.
+- **Avatars.** `HexAvatar` (`src/components/HexAvatar.tsx`) is used for every
+  avatar: photo, or initials on a gradient, in a hexagon.
+- **Breakpoints.** Container queries on the app root: 1181 and up (three
+  columns), 1001 to 1180 (narrower columns), 761 to 1000 (tablet), 760 and below
+  (full-screen snap feed with a bottom dock).
+- **Dev previews.** `/dev/feed` (fixture feed, no login) and `/dev/buttons` (every
+  button style in both themes). Both return 404 in production builds.
+
 ## Requirements
 
 - Node.js 20 or newer (built and tested on Node 22).
diff --git a/docs/handoff-redesign.md b/docs/handoff-redesign.md
new file mode 100644
index 0000000..03a85b7
--- /dev/null
+++ b/docs/handoff-redesign.md
@@ -0,0 +1,50 @@
+# Redesign handoff
+
+The Feed browser redesign (luxury business look, dark default plus light, desktop
+bento layout, mobile immersive feed). Spec: `docs/minnect-feed-redesign.spec.md`.
+Styling decisions: `docs/adr/0001-redesign-styling-approach.md`. CRM project
+Minnect, module 2.
+
+## What shipped, per milestone
+
+All four build milestones are merged into `develop` with merge commits.
+
+| Milestone | PR | Merge commit | Shipped |
+|---|---|---|---|
+| Redesign mobilization | #1 | c0f4260 | Spec and original contract in the repo; styling ADR; formatting decision (no bold or italic, bullets insert a bullet character) |
+| Redesign foundation | #2 | 9aeb9a3 | Dark and light tokens with persisted toggle; Manrope and Cormorant Garamond; HexAvatar; five button styles; sign-in screen |
+| Desktop bento layout | #3 | 25fd360 | Viewport-fit grid where only the feed scrolls; post cards; composer; new-posts pill and motion; featured carousel; Trending and Find experts; tablet layout; refresh button |
+| Mobile immersive feed | #4 | f3fd4b5 | Snap feed; sideways media swipe; double-tap like; featured slide; bottom dock; comments and composer sheets; Discover sheet; top bar and progress rail |
+| Redesign finalization | #5 | pending | Acceptance pass, contrast and hover fixes, `legacy.css` removed, README and this handoff. The orchestrator merges it. |
+
+Promotion of `develop` to `main` is Cesar's.
+
+## Known gaps
+
+- The upload progress bar is an animated sweep, not real progress. Real progress
+  needs upload events from the proxy. New scope (change request), not built.
+- NEEDS CESAR (from the acceptance pass, task 99puxwol5):
+  1. Acceptance 2 with a real account, dark and light, at 1440, 1024, 820 and 390px:
+     reading and paging, like and unlike, comments, posting text, image and video,
+     deleting your own post, expert search and categories, featured experts,
+     trending playback.
+  2. With real photos, check the 3-photo stack in mobile More.
+  3. On a real phone (iOS Safari and Android Chrome): vertical swipe snaps one
+     post, sideways swipe moves the dots, a playing video pauses on swipe-away,
+     double-tap likes with the burst, the featured carousel rotates again after
+     a tap elsewhere.
+  4. Lighthouse Accessibility on the feed, both themes, desktop and mobile; note
+     any contrast item below 4.5:1.
+
+## Run and verify
+
+```bash
+npm install
+npm run dev          # http://localhost:3000, sign in with a Minnect account
+npm run typecheck && npx eslint --no-eslintrc -c .eslintrc.json src tests
+npm test && npm run build
+```
+
+Without an account: open `/dev/feed` (fixture feed) and `/dev/buttons` (button
+styles). Use browser device mode at 1440, 1024, 820 and 390px and toggle the
+theme. These routes 404 in production.
diff --git a/src/app/globals.css b/src/app/globals.css
index bbc11b1..f3c5b0f 100644
--- a/src/app/globals.css
+++ b/src/app/globals.css
@@ -16,6 +16,8 @@
   --ink-2: #BFBDB8;
   --ink-3: #95938E;
   --accent: #C8141C;
+  /* Crimson for small text (like counts): plain crimson is 3.2:1 on the dark tiles. */
+  --accent-text: color-mix(in srgb, #C8141C, white 40%);
   --danger: #FF6B70;
   --glass: rgba(18,18,21,.72);
   --shadow-pop: 0 10px 28px rgba(0,0,0,.5);
@@ -41,6 +43,7 @@
   --ink-2: #46484D;
   --ink-3: #686A70;
   --accent: #C8141C;
+  --accent-text: #C8141C;
   --danger: #B3121A;
   --glass: rgba(251,250,248,.74);
   --shadow-pop: 0 10px 28px rgba(26,28,31,.14);
@@ -91,6 +94,8 @@
 @layer reset {
   *, *::before, *::after { box-sizing: border-box; }
   body { margin: 0; }
+  /* Form controls take the page font instead of the UA's 13.33px Arial. */
+  button, input, textarea, select { font: inherit; }
 }
 
 @layer base {
diff --git a/src/app/layout.tsx b/src/app/layout.tsx
index 1d69a50..d1d6c4a 100644
--- a/src/app/layout.tsx
+++ b/src/app/layout.tsx
@@ -16,7 +16,6 @@ import "../styles/trending.css";
 import "../styles/search.css";
 import "../styles/mobile.css";
 import "../styles/sheet.css";
-import "../styles/legacy.css";
 
 const manrope = Manrope({
   subsets: ["latin"],
diff --git a/src/components/Composer.tsx b/src/components/Composer.tsx
index ba84a0b..4f71b45 100644
--- a/src/components/Composer.tsx
+++ b/src/components/Composer.tsx
@@ -210,7 +210,7 @@ export function Composer({ value, busy, error, file = null, onChange, onFile, on
         </div>
       ) : null}
       {error ? (
-        <p className="error" role="alert">Publishing the post failed. Your text is still here.</p>
+        <p className="composer-error" role="alert">Publishing the post failed. Your text is still here.</p>
       ) : null}
       <div className="composer-bar">
         {onFile ? (
diff --git a/src/components/FeedView.tsx b/src/components/FeedView.tsx
index 777951d..494f4b4 100644
--- a/src/components/FeedView.tsx
+++ b/src/components/FeedView.tsx
@@ -4,7 +4,7 @@ import type { ReactNode, Ref } from "react";
 import { canDelete, type CardPost } from "@/lib/feed-model";
 import type { DiscoverExpert, DiscoverMinnect } from "@/lib/discover";
 import { Composer, type ComposerProps } from "./Composer";
-import { GrowButton, IconButton } from "./Buttons";
+import { GrowButton, IconButton, SweepButton } from "./Buttons";
 import { PostCard } from "./PostCard";
 import { useCompactLayout } from "./layout-context";
 import { MobileFeed, type CurrentSlide } from "./MobileFeed";
@@ -142,7 +142,7 @@ export function FeedView(p: FeedViewProps) {
       <FeedPanel onRefresh={p.onRefresh}>
         <div className="feed-message" role="alert">
           <p>The feed did not load.</p>
-          <button type="button" onClick={p.onRetry}>Try again</button>
+          <SweepButton label="Try again" onClick={p.onRetry} />
         </div>
       </FeedPanel>
     );
@@ -176,7 +176,7 @@ export function FeedView(p: FeedViewProps) {
         {p.loadMoreFailed ? (
           <div className="feed-message" role="alert">
             <p>The feed did not load.</p>
-            <button type="button" onClick={p.onRetry}>Try again</button>
+            <SweepButton label="Try again" onClick={p.onRetry} />
           </div>
         ) : null}
         {p.loadingMore ? <SkeletonCard /> : null}
diff --git a/src/components/MinnectMedia.tsx b/src/components/MinnectMedia.tsx
index 4cb5494..1acb8b3 100644
--- a/src/components/MinnectMedia.tsx
+++ b/src/components/MinnectMedia.tsx
@@ -17,11 +17,14 @@ interface Props {
  * The trending card's 16:9 frame. Video answers play inline as a <video> with a
  * poster; audio keeps its <audio> control under the frame; no url shows the
  * thumbnail only. The glass chip, play button, views and kind label sit over
- * the thumbnail and step aside while a video plays.
+ * the thumbnail and step aside once a video has started, and only then does the
+ * video show its native controls.
  */
 export function MinnectMedia({ media, thumbnailUrl, question, who, pictureUrl, views = null }: Props) {
   const [videoFailed, setVideoFailed] = useState(false);
-  const [playing, setPlaying] = useState(false);
+  // Native controls only after the first play, so the frame never shows our
+  // play button and the browser's controls at the same time.
+  const [started, setStarted] = useState(false);
   const video = useRef<HTMLVideoElement | null>(null);
   const audio = useRef<HTMLAudioElement | null>(null);
 
@@ -36,20 +39,19 @@ export function MinnectMedia({ media, thumbnailUrl, question, who, pictureUrl, v
 
   return (
     <>
-      <div className={`trend-media${playing ? " trend-media-playing" : ""}`}>
+      <div className={`trend-media${started ? " trend-media-playing" : ""}`}>
         {isVideo ? (
           <video
             ref={video}
             className="minnect-thumb minnect-video"
-            controls
+            controls={started}
             playsInline
             preload="none"
             src={media.url}
             poster={thumbnailUrl ?? undefined}
             aria-label={`Play answer from ${who}`}
-            onPlay={() => setPlaying(true)}
-            onPause={() => setPlaying(false)}
-            onEnded={() => setPlaying(false)}
+            onClick={started ? undefined : play}
+            onPlay={() => setStarted(true)}
             onError={() => setVideoFailed(true)}
           />
         ) : thumbnailUrl ? (
diff --git a/src/components/MobileFeed.tsx b/src/components/MobileFeed.tsx
index 91e55db..74e7a78 100644
--- a/src/components/MobileFeed.tsx
+++ b/src/components/MobileFeed.tsx
@@ -2,7 +2,7 @@
 
 import { useCallback, useEffect, useRef, useState, type MouseEvent, type Ref } from "react";
 import { canDelete, formatDuration, isPlayableVideo, relativeTime, type CardMedia, type CardPost } from "@/lib/feed-model";
-import { GrowButton } from "./Buttons";
+import { GrowButton, SweepButton } from "./Buttons";
 import { HexAvatar } from "./HexAvatar";
 import { PlayIcon, PostMenu } from "./PostCard";
 import { VideoPlayer } from "./VideoPlayer";
@@ -438,7 +438,7 @@ export function MobileFeed(p: FeedViewProps) {
         {p.status === "error" ? (
           <section className="slide slide-message is-cur" data-index={0} role="alert">
             <p>The feed did not load.</p>
-            <button type="button" onClick={p.onRetry}>Try again</button>
+            <SweepButton label="Try again" onClick={p.onRetry} />
           </section>
         ) : null}
         {p.status === "ready" && p.posts.length === 0 && !showLoad ? (
@@ -457,7 +457,7 @@ export function MobileFeed(p: FeedViewProps) {
         {p.status === "ready" && p.loadMoreFailed ? (
           <section className="slide slide-message" data-index={slideCount} role="alert">
             <p>The feed did not load.</p>
-            <button type="button" onClick={p.onRetry}>Try again</button>
+            <SweepButton label="Try again" onClick={p.onRetry} />
           </section>
         ) : null}
         {showLoad ? (
diff --git a/src/components/SignInForm.tsx b/src/components/SignInForm.tsx
index d98d9d8..fdb040c 100644
--- a/src/components/SignInForm.tsx
+++ b/src/components/SignInForm.tsx
@@ -44,7 +44,7 @@ export function SignInForm({ onSignedIn }: { onSignedIn: (p: Person) => void })
         </div>
         <form className="signin-form" onSubmit={submit} noValidate>
           {error && (
-            <p role="alert" className="error signin-error">
+            <p role="alert" className="signin-error">
               {error}
             </p>
           )}
diff --git a/src/styles/buttons.css b/src/styles/buttons.css
index 265e7a3..d62253f 100644
--- a/src/styles/buttons.css
+++ b/src/styles/buttons.css
@@ -2,8 +2,8 @@
  * Button system (spec "Buttons", ADR 0001 sections 6 to 8).
  * Five styles plus the glossy crimson icon button, ported from the mockup's
  * recolored rules. Tokens only; white and black appear only on crimson faces.
- * Every class sets margin, padding, font and color itself so the legacy
- * `button` rules and any `button { color: inherit }` never leak in.
+ * Every class sets margin, padding, font and color itself so no global
+ * `button` rule, such as `button { color: inherit }`, can leak in.
  */
 
 /* Shared base for every style. */
@@ -242,7 +242,7 @@
 .btn-depth .btn-depth-icon svg { width: 20px; height: 20px; }
 .btn-depth .btn-depth-text { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 2px; }
 .btn-depth .btn-depth-label { font-size: 15px; font-weight: 700; color: inherit; }
-.btn-depth .btn-depth-sub { font-size: 12.5px; color: var(--ink-3); transition: color .3s; }
+.btn-depth .btn-depth-sub { font-size: 12.5px; font-weight: 500; color: var(--ink-3); transition: color .3s; }
 .btn-depth:hover,
 .btn-depth:focus-visible { color: var(--on-accent); }
 .btn-depth:hover::before,
diff --git a/src/styles/composer.css b/src/styles/composer.css
index 88a533b..0028599 100644
--- a/src/styles/composer.css
+++ b/src/styles/composer.css
@@ -220,3 +220,6 @@
   .composer-att,
   .composer-prog i { animation: none !important; }
 }
+
+/* Publish failure, above the toolbar. */
+.composer-error { margin: 0 0 4px; padding: 10px 12px; border: 1px solid var(--accent); border-radius: 8px; color: var(--danger); background: var(--accent-soft); font-size: 14px; }
diff --git a/src/styles/layout.css b/src/styles/layout.css
index d4933c7..a6c86e2 100644
--- a/src/styles/layout.css
+++ b/src/styles/layout.css
@@ -2,6 +2,9 @@
    .app is the size container; .bento is its child, so container queries can
    style it. The page never scrolls: only the panels' own lists do. */
 
+/* Session check: one centered line while the session loads. */
+.center { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
+
 .app {
   container: app / inline-size;
   height: 100vh;
diff --git a/src/styles/legacy.css b/src/styles/legacy.css
deleted file mode 100644
index 78e9510..0000000
--- a/src/styles/legacy.css
+++ /dev/null
@@ -1,15 +0,0 @@
-/* Pre-redesign component rules, recolored with the tokens so the current
-   screens stay readable in both themes. Each redesign component task moves its
-   rules into its own file in src/styles/ (ADR 0001, section 6) and deletes them
-   here; the file goes when it is empty. Do not add new rules here.
-   Literal white and black are only text on crimson and video letterboxing. */
-.center { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
-label { font-size: 14px; font-weight: 500; margin-top: 8px; }
-input { font: inherit; padding: 12px; border: 1px solid var(--line-2); border-radius: 8px; background: var(--tile-2); color: var(--ink); }
-input:focus-visible, button:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }
-button { font: inherit; font-weight: 500; margin-top: 16px; padding: 12px; border: 0; border-radius: 8px; background: var(--accent); color: white; cursor: pointer; }
-.error { margin: 0 0 4px; padding: 10px 12px; border: 1px solid var(--accent); border-radius: 8px; color: var(--danger); background: var(--accent-soft); font-size: 14px; }
-
-
-
-
diff --git a/src/styles/mobile.css b/src/styles/mobile.css
index e9204eb..cb905f7 100644
--- a/src/styles/mobile.css
+++ b/src/styles/mobile.css
@@ -234,6 +234,8 @@
   padding: 70px 0 110px;
   background: radial-gradient(90% 55% at 50% 46%, color-mix(in oklab, var(--accent), transparent 84%), transparent 70%), var(--bg);
 }
+/* The crimson glow tints the light page enough to drop --ink-3 meta below 4.5:1. */
+[data-theme="light"] .slide-featured { --ink-3: var(--ink-2); }
 .slide-feat-title {
   margin: 10px 24px 0;
   text-align: center;
@@ -362,7 +364,8 @@
 .dk svg { width: 22px; height: 22px; flex: none; }
 @media (hover: hover) { .dk:hover:not(:disabled) { background: var(--tile-3); } }
 .dk:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }
-.dk.dk-like-on { color: var(--accent); }
+.dk.dk-like-on { color: var(--accent-text); }
+.dk.dk-like-on svg { color: var(--accent); }
 .dk-beat svg { animation: post-beat .5s cubic-bezier(.2,.9,.3,1.4); }
 .dk:disabled { opacity: 1; color: var(--ink-3); cursor: default; }
 .btn-spark.btn-spark-fab.dk-plus { flex: 0 0 64px; width: 64px; height: 52px; }
diff --git a/src/styles/post.css b/src/styles/post.css
index a82a28d..4b6915a 100644
--- a/src/styles/post.css
+++ b/src/styles/post.css
@@ -1,7 +1,7 @@
 /*
  * Post card, comments and the own-post menu (spec "Post card", ADR 0001).
  * Prefixed `post-` classes, tokens only. Every button sets margin, padding,
- * font and color itself so the legacy `button` rule never leaks in.
+ * font and color itself so no global `button` rule leaks in.
  * --on-accent (white) appears only over video and on crimson faces.
  */
 @keyframes post-rise { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
@@ -122,7 +122,9 @@
 .post-act:hover:not(:disabled) { background: var(--post-soft); color: var(--ink); }
 .post-act:disabled { cursor: default; }
 .post-like:hover:not(:disabled),
-.post-like-on { color: var(--accent); }
+.post-like-on { color: var(--accent-text); }
+.post-like:hover:not(:disabled) .post-heart,
+.post-like-on .post-heart { color: var(--accent); }
 .post-like-beat .post-heart { animation: post-beat .5s cubic-bezier(.2,.9,.3,1.4); }
 .post-act-open { color: var(--ink); background: var(--post-soft); }
 
diff --git a/src/styles/sheet.css b/src/styles/sheet.css
index d6d6d27..a929c12 100644
--- a/src/styles/sheet.css
+++ b/src/styles/sheet.css
@@ -96,7 +96,8 @@
 .sheet-discover .btn-depth:hover .btn-depth-chev,
 .sheet-discover .btn-depth:focus-visible .btn-depth-chev { color: var(--on-accent); }
 .depth-stack { display: flex; flex: none; }
-.depth-stack .hex-avatar { margin-left: -10px; }
+/* A small overlap: a bigger one hid the initials of the avatars underneath. */
+.depth-stack .hex-avatar { margin-left: -5px; }
 .depth-stack .hex-avatar:first-child { margin-left: 0; }
 .sheet-sub { margin: 4px 0 -6px 4px; color: var(--ink-3); }
 .seg-depth {
diff --git a/src/styles/signin.css b/src/styles/signin.css
index 2da8d81..74a88f5 100644
--- a/src/styles/signin.css
+++ b/src/styles/signin.css
@@ -100,4 +100,4 @@
 }
 .signin-field input::placeholder { color: var(--ink-3); }
 .signin-form .signin-submit { margin-top: 18px; width: 100%; height: 54px; }
-.signin-error { margin: 0; }
+.signin-error { margin: 0; padding: 10px 12px; border: 1px solid var(--accent); border-radius: 8px; color: var(--danger); background: var(--accent-soft); font-size: 14px; }
diff --git a/tests/buttons.test.ts b/tests/buttons.test.ts
index d2d2c34..7eb470b 100644
--- a/tests/buttons.test.ts
+++ b/tests/buttons.test.ts
@@ -1,5 +1,5 @@
 import { describe, expect, it } from "vitest";
-import { readFileSync } from "node:fs";
+import { existsSync, readdirSync, readFileSync } from "node:fs";
 import path from "node:path";
 import { createElement } from "react";
 import { renderToStaticMarkup } from "react-dom/server";
@@ -34,11 +34,21 @@ describe("SparkleButton disabled", () => {
     expect(body).toContain("var(--tile-3)");
     expect(body).toContain("var(--ink-2)");
     expect(body).toContain("not-allowed");
-    expect(readFileSync(path.resolve(__dirname, "../src/styles/legacy.css"), "utf8")).not.toMatch(/button:disabled\s*\{[^}]*opacity/);
+    for (const f of readdirSync(path.resolve(__dirname, "../src/styles"))) {
+      expect(readFileSync(path.resolve(__dirname, "../src/styles", f), "utf8")).not.toMatch(/(^|[\s,}])button:disabled\s*\{[^}]*opacity/);
+    }
     expect(html(createElement(SparkleButton, { label: "Sign in", disabled: true }))).toContain("disabled");
   });
 });
 
+describe("legacy.css", () => {
+  it("is deleted and no longer imported, and no global button margin rule is left", () => {
+    expect(existsSync(path.resolve(__dirname, "../src/styles/legacy.css"))).toBe(false);
+    expect(readFileSync(path.resolve(__dirname, "../src/app/layout.tsx"), "utf8")).not.toContain("legacy.css");
+    expect(globals).not.toMatch(/(^|[\s,}])button\s*\{[^}]*margin/);
+  });
+});
+
 describe("FlipButton states", () => {
   it("ready: POST plus send icon, flips to PUBLISH with the icon", () => {
     expect(flipLabels("ready")).toEqual({ front: "Post", back: "Publish", icon: true });
diff --git a/tests/discover-rails.test.ts b/tests/discover-rails.test.ts
index d40bc35..2a77253 100644
--- a/tests/discover-rails.test.ts
+++ b/tests/discover-rails.test.ts
@@ -57,7 +57,9 @@ describe("TrendingMinnectsRail", () => {
       minnects: [minnect({ media: { kind: "video", url, duration: 9, waveform: null } })],
     }));
     expect(out).toContain("<video");
-    expect(out).toContain("controls");
+    // Before the first play only our play button shows, not the native controls too.
+    expect(out).not.toMatch(/<video[^>]*controls/);
+    expect(out).toContain('class="trend-play"');
     expect(out).toContain("preload=\"none\"");
     expect(out).toContain("X-Amz-Signature=abc");
     expect(out).toContain('poster="https://x/t.jpg"');