diff --git a/src/App.tsx b/src/App.tsx
index c90690e..179418a 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -9,11 +9,11 @@ import { DeckView } from "./views/DeckView";
 
 type Tab = "add" | "library" | "decks";
 
-const svg = (children: ReactNode) => (
+const svg = (children: ReactNode, size = 20) => (
   <svg
     viewBox="0 0 24 24"
-    width="20"
-    height="20"
+    width={size}
+    height={size}
     fill="none"
     stroke="currentColor"
     strokeWidth="2"
@@ -24,6 +24,27 @@ const svg = (children: ReactNode) => (
   </svg>
 );
 
+const ICON_OPEN_LIBRARY = svg(
+  <path d="M22 19a2 2 0 0 1-2 2H4a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h5l2 3h9a2 2 0 0 1 2 2z" />,
+  16,
+);
+const ICON_NEW_LIBRARY = svg(
+  <>
+    <path d="M22 19a2 2 0 0 1-2 2H4a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h5l2 3h9a2 2 0 0 1 2 2z" />
+    <line x1="12" y1="11" x2="12" y2="17" />
+    <line x1="9" y1="14" x2="15" y2="14" />
+  </>,
+  16,
+);
+const ICON_DOWNLOAD = svg(
+  <>
+    <path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4" />
+    <polyline points="7 10 12 15 17 10" />
+    <line x1="12" y1="15" x2="12" y2="3" />
+  </>,
+  16,
+);
+
 const NAV: { id: Tab; label: string; icon: ReactNode }[] = [
   { id: "add", label: "Add Cards", icon: svg(<path d="M12 5v14M5 12h14" />) },
   {
@@ -124,14 +145,25 @@ export default function App() {
     await api.cancelUpdateCardData();
   }
 
+  async function switchLibrary(path: string) {
+    try {
+      setStatus(await api.setLibraryPath(path));
+    } catch (err) {
+      setProgress({
+        stage: "error",
+        message: `Couldn't open that library: ${String(err)}`,
+        overall_percent: 0,
+        stages: lastProgress.current?.stages ?? [],
+      });
+    }
+  }
+
   async function openLibrary() {
     const path = await open({
       title: "Open an existing library.db",
       filters: [{ name: "SQLite", extensions: ["db", "sqlite"] }],
     });
-    if (typeof path === "string") {
-      setStatus(await api.setLibraryPath(path));
-    }
+    if (typeof path === "string") await switchLibrary(path);
   }
 
   async function newLibrary() {
@@ -140,9 +172,7 @@ export default function App() {
       defaultPath: "library.db",
       filters: [{ name: "SQLite", extensions: ["db", "sqlite"] }],
     });
-    if (typeof path === "string") {
-      setStatus(await api.setLibraryPath(path));
-    }
+    if (typeof path === "string") await switchLibrary(path);
   }
 
   const ready = status?.reference_ready ?? false;
@@ -177,19 +207,19 @@ export default function App() {
 
         <div className="main">
           <header className="topbar">
-            {status && (
-              <span className="path" title={status.library_path}>
-                {status.library_path}
-              </span>
-            )}
-            <span className="spacer" />
+            <span className="path" title={status?.library_path ?? ""}>
+              {status?.library_path ?? ""}
+            </span>
             <button onClick={openLibrary} disabled={busy}>
-              Open Library…
+              {ICON_OPEN_LIBRARY}
+              Open Library
             </button>
             <button onClick={newLibrary} disabled={busy}>
-              New Library…
+              {ICON_NEW_LIBRARY}
+              New Library
             </button>
             <button onClick={updateCardData} disabled={busy} className="primary">
+              {ICON_DOWNLOAD}
               {ready ? "Update card data" : "Download card data"}
             </button>
           </header>
@@ -249,6 +279,7 @@ export default function App() {
                   be synced.
                 </p>
                 <button className="primary big" onClick={updateCardData} disabled={busy}>
+                  {ICON_DOWNLOAD}
                   {busy ? "Downloading…" : "Download card data"}
                 </button>
               </div>
diff --git a/src/api.ts b/src/api.ts
index b7f283a..a64fdba 100644
--- a/src/api.ts
+++ b/src/api.ts
@@ -11,6 +11,7 @@ export interface CardRef {
   color_identity: number; // WUBRG bitmask
   type_line: string;
   image_uri: string; // Scryfall "normal" image URL, or "" if unavailable
+  back_image_uri: string; // back face for transform/MDFC/reversible cards, else ""
 }
 
 export interface LibraryCard extends CardRef {
diff --git a/src/components.tsx b/src/components.tsx
index 4c9cda4..92588a4 100644
--- a/src/components.tsx
+++ b/src/components.tsx
@@ -40,6 +40,58 @@ export function LocationField({
   );
 }
 
+/**
+ * A small pill-shaped [− N +] quantity stepper, used consistently for owned-copy
+ * counts on the Add Cards page and both Library views.
+ *
+ * - `overlay`: dark translucent variant for use atop card art (tile corners),
+ *   instead of the default panel-toned variant used in rows/lists.
+ * - `warn`: tints the pill amber (e.g. "assigned to more decks than owned").
+ * - `pending`: dims the pill (e.g. mid grace-period before a 0-qty row is removed).
+ */
+export function QtyStepper({
+  value,
+  onDecrement,
+  onIncrement,
+  overlay,
+  warn,
+  pending,
+}: {
+  value: number;
+  onDecrement: () => void;
+  onIncrement: () => void;
+  overlay?: boolean;
+  warn?: boolean;
+  pending?: boolean;
+}) {
+  return (
+    <span
+      className={[
+        "qty-stepper",
+        overlay ? "qty-stepper-overlay" : "",
+        warn ? "warn" : "",
+        pending ? "pending" : "",
+      ]
+        .filter(Boolean)
+        .join(" ")}
+    >
+      <button
+        type="button"
+        className="qty-stepper-btn"
+        onClick={onDecrement}
+        disabled={value <= 0}
+        title="Remove a copy"
+      >
+        −
+      </button>
+      <span className="qty-stepper-value">{value}</span>
+      <button type="button" className="qty-stepper-btn" onClick={onIncrement} title="Add a copy">
+        +
+      </button>
+    </span>
+  );
+}
+
 /** Render a color-identity/colors bitmask as WUBRG pips (colorless = a "C" pip). */
 export function ColorPips({ mask }: { mask: number }) {
   const letters = maskToLetters(mask);
@@ -61,9 +113,14 @@ export function ColorPips({ mask }: { mask: number }) {
   );
 }
 
-/** Small card-image thumbnail. Hovering it shows the full-size preview. */
+/**
+ * Small card-image thumbnail. Hovering it shows a cursor-tracking preview;
+ * clicking it opens a larger, centered preview (with a flip button for
+ * double-faced cards).
+ */
 export function CardThumb({ card }: { card: CardRef }) {
   const { handlers } = useHoverPreview();
+  const { open } = useClickPreview();
   if (!card.image_uri) {
     return (
       <span className="thumb-empty" title="No image">
@@ -77,6 +134,10 @@ export function CardThumb({ card }: { card: CardRef }) {
       src={card.image_uri}
       alt={card.name}
       loading="lazy"
+      onClick={(e) => {
+        e.stopPropagation();
+        open(card);
+      }}
       {...handlers(card)}
     />
   );
@@ -148,7 +209,7 @@ export function CardSearchBox({
           {results.map((c, i) => (
             <li
               key={c.oracle_id}
-              style={i === sel ? { background: "var(--panel-2)" } : undefined}
+              style={i === sel ? { background: "var(--accent-subtle)" } : undefined}
               onMouseEnter={() => setSel(i)}
               onClick={() => pick(c)}
             >
@@ -163,35 +224,59 @@ export function CardSearchBox({
   );
 }
 
-// --- Hover preview --------------------------------------------------------
+// --- Hover + click preview -------------------------------------------------
 
 interface HoverApi {
   enter: (card: CardRef, e: React.MouseEvent) => void;
   move: (e: React.MouseEvent) => void;
   leave: () => void;
 }
+interface ClickApi {
+  open: (card: CardRef) => void;
+}
 const HoverCtx = createContext<HoverApi | null>(null);
+const ClickCtx = createContext<ClickApi | null>(null);
 
 /**
- * Provides a single floating card-image preview that appears while hovering a
- * card and tracks the cursor. Wrap the app once; attach `handlers(card)` from
- * [`useHoverPreview`] to any element that should trigger it.
+ * Provides card-image previews app-wide: a small floating preview that
+ * tracks the cursor while hovering (see [`useHoverPreview`]), and a larger
+ * centered modal on click (see [`useClickPreview`]) — with a flip button for
+ * double-faced cards. Wrap the app once.
  */
 export function HoverPreviewProvider({ children }: { children: ReactNode }) {
-  const [state, setState] = useState<{ card: CardRef; x: number; y: number } | null>(null);
+  const [hover, setHover] = useState<{ card: CardRef; x: number; y: number } | null>(null);
+  const [clicked, setClicked] = useState<{ card: CardRef; showBack: boolean } | null>(null);
 
   const enter = useCallback((card: CardRef, e: React.MouseEvent) => {
-    if (card.image_uri) setState({ card, x: e.clientX, y: e.clientY });
+    if (card.image_uri) setHover({ card, x: e.clientX, y: e.clientY });
   }, []);
   const move = useCallback((e: React.MouseEvent) => {
-    setState((s) => (s ? { ...s, x: e.clientX, y: e.clientY } : s));
+    setHover((s) => (s ? { ...s, x: e.clientX, y: e.clientY } : s));
   }, []);
-  const leave = useCallback(() => setState(null), []);
+  const leave = useCallback(() => setHover(null), []);
+
+  const open = useCallback((card: CardRef) => {
+    if (!card.image_uri) return;
+    setHover(null);
+    setClicked({ card, showBack: false });
+  }, []);
+  const close = useCallback(() => setClicked(null), []);
+  const flip = useCallback(() => setClicked((c) => (c ? { ...c, showBack: !c.showBack } : c)), []);
+
+  useEffect(() => {
+    if (!clicked) return;
+    const onKey = (e: KeyboardEvent) => e.key === "Escape" && close();
+    window.addEventListener("keydown", onKey);
+    return () => window.removeEventListener("keydown", onKey);
+  }, [clicked, close]);
 
   return (
     <HoverCtx.Provider value={{ enter, move, leave }}>
-      {children}
-      {state && <FloatingCard card={state.card} x={state.x} y={state.y} />}
+      <ClickCtx.Provider value={{ open }}>
+        {children}
+        {!clicked && hover && <FloatingCard card={hover.card} x={hover.x} y={hover.y} />}
+        {clicked && <ClickPreviewModal state={clicked} onClose={close} onFlip={flip} />}
+      </ClickCtx.Provider>
     </HoverCtx.Provider>
   );
 }
@@ -211,6 +296,12 @@ export function useHoverPreview() {
   };
 }
 
+/** Returns `open(card)` to trigger the larger click-to-preview modal. */
+export function useClickPreview() {
+  const api = useContext(ClickCtx);
+  return { open: (card: CardRef) => api?.open(card) };
+}
+
 const PREVIEW_W = 320;
 const PREVIEW_H = 446; // ~ card aspect for the normal image
 const GAP = 24;
@@ -231,6 +322,34 @@ function FloatingCard({ card, x, y }: { card: CardRef; x: number; y: number }) {
   );
 }
 
+function ClickPreviewModal({
+  state,
+  onClose,
+  onFlip,
+}: {
+  state: { card: CardRef; showBack: boolean };
+  onClose: () => void;
+  onFlip: () => void;
+}) {
+  const { card, showBack } = state;
+  const src = showBack && card.back_image_uri ? card.back_image_uri : card.image_uri;
+  return (
+    <div className="preview-modal-backdrop" onClick={onClose}>
+      <div className="preview-modal" onClick={(e) => e.stopPropagation()}>
+        <img className="preview-modal-img" src={src} alt={card.name} />
+        <button className="preview-modal-close" onClick={onClose} title="Close (Esc)">
+          ✕
+        </button>
+        {card.back_image_uri && (
+          <button className="preview-modal-flip" onClick={onFlip} title="Show the other side">
+            ⟲ Flip
+          </button>
+        )}
+      </div>
+    </div>
+  );
+}
+
 // --- Grouping -------------------------------------------------------------
 
 export type GroupMode = "none" | "type" | "subtype" | "cmc" | "colors";
@@ -405,7 +524,10 @@ export function ViewToggle({
   );
 }
 
-/** A single card rendered as a full image tile, with optional corner + footer. */
+/**
+ * A single card rendered as a full image tile, with optional corner + footer.
+ * Clicking the image opens a larger click-to-preview modal.
+ */
 export function CardTile({
   card,
   corner,
@@ -415,11 +537,18 @@ export function CardTile({
   corner?: ReactNode;
   footer?: ReactNode;
 }) {
+  const { open } = useClickPreview();
   return (
     <div className="tile">
       <div className="tile-img-wrap">
         {card.image_uri ? (
-          <img className="tile-img" src={card.image_uri} alt={card.name} loading="lazy" />
+          <img
+            className="tile-img"
+            src={card.image_uri}
+            alt={card.name}
+            loading="lazy"
+            onClick={() => open(card)}
+          />
         ) : (
           <div className="tile-noimg">{card.name}</div>
         )}
diff --git a/src/styles.css b/src/styles.css
index e9d3e2d..d44571c 100644
--- a/src/styles.css
+++ b/src/styles.css
@@ -91,6 +91,9 @@ body {
 /* -------- Controls -------- */
 
 button {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
   background: var(--bg-input);
   color: var(--text);
   border: 1px solid var(--border);
@@ -102,6 +105,9 @@ button {
   font-family: inherit;
   transition: background 0.12s, border-color 0.12s, transform 0.05s, filter 0.12s;
 }
+button svg {
+  flex-shrink: 0;
+}
 button:hover {
   background: var(--bg-hover);
   border-color: var(--bg-elev);
@@ -281,13 +287,14 @@ select:focus {
   border-bottom: 1px solid var(--border-soft);
 }
 .path {
+  flex: 1 1 auto;
+  min-width: 0;
   font-size: 12px;
   font-family: ui-monospace, "SF Mono", Menlo, monospace;
   color: var(--faint);
   background: rgba(0, 0, 0, 0.25);
   padding: 4px 10px;
   border-radius: 6px;
-  max-width: 460px;
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
@@ -477,6 +484,102 @@ h4 {
   font-weight: 700;
 }
 
+/* ============================================================
+   Quantity stepper: [− N +] for owned-copy counts. Used on Add Cards
+   and both Library views (list + tile) for a consistent look.
+   ============================================================ */
+.qty-stepper {
+  display: inline-flex;
+  align-items: center;
+  height: 26px;
+  border-radius: 999px;
+  background: var(--bg-input);
+  border: 1px solid var(--border);
+  overflow: hidden;
+  transition: opacity 0.25s ease, background 0.15s ease, border-color 0.15s ease;
+}
+.qty-stepper-btn {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 26px;
+  height: 100%;
+  padding: 0;
+  background: none;
+  border: none;
+  border-radius: 0;
+  color: var(--muted);
+  font-size: 15px;
+  font-weight: 600;
+  line-height: 1;
+  cursor: pointer;
+  transition: background 0.12s, color 0.12s;
+}
+.qty-stepper-btn:hover:not(:disabled) {
+  background: var(--accent-subtle);
+  color: var(--accent-hover);
+}
+.qty-stepper-btn:active:not(:disabled) {
+  background: var(--accent);
+  color: #fff;
+  transform: none;
+}
+.qty-stepper-btn:disabled {
+  opacity: 0.3;
+  cursor: default;
+}
+.qty-stepper-value {
+  min-width: 22px;
+  text-align: center;
+  padding: 0 2px;
+  font-size: 13px;
+  font-weight: 700;
+  color: var(--text-strong);
+  font-variant-numeric: tabular-nums;
+}
+.qty-stepper.warn {
+  border-color: var(--warn);
+}
+.qty-stepper.warn .qty-stepper-value {
+  color: var(--warn);
+}
+.qty-stepper.pending {
+  opacity: 0.5;
+}
+
+/* Overlay variant: dark translucent pill for use atop card art. */
+.qty-stepper-overlay {
+  height: 24px;
+  background: rgba(0, 0, 0, 0.78);
+  border: none;
+  backdrop-filter: blur(2px);
+}
+.qty-stepper-overlay .qty-stepper-btn {
+  width: 22px;
+  color: rgba(255, 255, 255, 0.85);
+}
+.qty-stepper-overlay .qty-stepper-btn:hover:not(:disabled) {
+  background: rgba(255, 255, 255, 0.18);
+  color: #fff;
+}
+.qty-stepper-overlay .qty-stepper-btn:active:not(:disabled) {
+  background: var(--accent);
+  color: #fff;
+}
+.qty-stepper-overlay .qty-stepper-value {
+  color: #fff;
+}
+.qty-stepper-overlay.warn {
+  background: var(--warn);
+}
+.qty-stepper-overlay.warn .qty-stepper-value,
+.qty-stepper-overlay.warn .qty-stepper-btn {
+  color: #241700;
+}
+.qty-stepper-overlay.warn .qty-stepper-btn:hover:not(:disabled) {
+  background: rgba(0, 0, 0, 0.12);
+}
+
 /* ============================================================
    Lists (search results, deck list)
    ============================================================ */
@@ -674,6 +777,79 @@ tbody tr:hover {
   pointer-events: none;
 }
 
+.preview-modal-backdrop {
+  position: fixed;
+  inset: 0;
+  z-index: 300;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  background: rgba(10, 10, 12, 0.72);
+  backdrop-filter: blur(2px);
+  cursor: zoom-out;
+  animation: preview-fade-in 0.12s ease;
+}
+@keyframes preview-fade-in {
+  from {
+    opacity: 0;
+  }
+  to {
+    opacity: 1;
+  }
+}
+.preview-modal {
+  position: relative;
+  cursor: default;
+}
+.preview-modal-img {
+  display: block;
+  max-width: min(560px, 84vw);
+  max-height: 84vh;
+  border-radius: 18px;
+  box-shadow: var(--shadow-lg);
+  border: 1px solid rgba(255, 255, 255, 0.08);
+}
+.preview-modal-close {
+  position: absolute;
+  top: -14px;
+  right: -14px;
+  width: 32px;
+  height: 32px;
+  padding: 0;
+  border-radius: 999px;
+  background: var(--bg-elev);
+  color: var(--text);
+  border: 1px solid var(--border);
+  font-size: 14px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  box-shadow: var(--shadow-md);
+}
+.preview-modal-close:hover {
+  background: var(--danger);
+  border-color: var(--danger);
+  color: #fff;
+}
+.preview-modal-flip {
+  position: absolute;
+  bottom: 14px;
+  left: 50%;
+  transform: translateX(-50%);
+  padding: 7px 16px;
+  border-radius: 999px;
+  background: rgba(20, 20, 24, 0.75);
+  color: #fff;
+  border: 1px solid rgba(255, 255, 255, 0.15);
+  font-size: 12px;
+  font-weight: 600;
+  backdrop-filter: blur(4px);
+}
+.preview-modal-flip:hover {
+  background: var(--accent);
+  border-color: var(--accent);
+}
+
 .tile-grid {
   display: grid;
   grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
@@ -692,6 +868,7 @@ tbody tr:hover {
   display: block;
   border-radius: 12px;
   box-shadow: var(--shadow-sm);
+  cursor: zoom-in;
   transition: transform 0.12s, box-shadow 0.12s;
 }
 .tile:hover .tile-img {
diff --git a/src/views/CardEntry.tsx b/src/views/CardEntry.tsx
index 569166e..5a7d253 100644
--- a/src/views/CardEntry.tsx
+++ b/src/views/CardEntry.tsx
@@ -1,6 +1,6 @@
 import { useEffect, useState } from "react";
 import { api, CardRef } from "../api";
-import { CardSearchBox } from "../components";
+import { CardSearchBox, QtyStepper } from "../components";
 
 /** Rapid card entry: fuzzy search-as-you-type, ↑/↓ + Enter (or click) adds one copy. */
 export function CardEntry() {
@@ -81,17 +81,11 @@ export function CardEntry() {
                 <span className="card-name">{r.name}</span>
                 {r.location && <span className="deck-chip">{r.location}</span>}
                 <span className="spacer" />
-                <button
-                  onClick={() => adjust(r.oracleId, -1)}
-                  disabled={r.qty <= 0}
-                  title="Remove a copy"
-                >
-                  −
-                </button>
-                <span className="badge">owned ×{r.qty}</span>
-                <button onClick={() => adjust(r.oracleId, 1)} title="Add another copy">
-                  +
-                </button>
+                <QtyStepper
+                  value={r.qty}
+                  onDecrement={() => adjust(r.oracleId, -1)}
+                  onIncrement={() => adjust(r.oracleId, 1)}
+                />
               </li>
             ))}
           </ul>
diff --git a/src/views/DeckView.tsx b/src/views/DeckView.tsx
index 5d98cfd..48325b4 100644
--- a/src/views/DeckView.tsx
+++ b/src/views/DeckView.tsx
@@ -269,7 +269,7 @@ export function DeckView() {
           {decks.map((d) => (
             <li
               key={d.id}
-              style={d.id === selected ? { background: "var(--panel-2)" } : undefined}
+              style={d.id === selected ? { background: "var(--accent-subtle)" } : undefined}
               onClick={() => setSelected(d.id)}
             >
               <span className="card-name">{d.name}</span>
diff --git a/src/views/LibraryBrowser.tsx b/src/views/LibraryBrowser.tsx
index a3df1eb..1e8d58d 100644
--- a/src/views/LibraryBrowser.tsx
+++ b/src/views/LibraryBrowser.tsx
@@ -1,4 +1,4 @@
-import { useEffect, useState } from "react";
+import { useEffect, useRef, useState } from "react";
 import { api, Deck, LibraryCard, LibraryFilter } from "../api";
 import {
   CardThumb,
@@ -8,12 +8,18 @@ import {
   GroupBySelect,
   GroupMode,
   LocationField,
+  QtyStepper,
   ViewToggle,
   groupCards,
   usePersistedState,
   useViewMode,
 } from "../components";
 
+// How long a card that's been decremented to 0 lingers (dimmed, still
+// adjustable) before actually dropping out of the library view — gives the
+// user a window to undo an accidental removal by clicking + again.
+const REMOVAL_GRACE_MS = 5000;
+
 /** Browse & filter the owned library by name and card criteria. */
 export function LibraryBrowser() {
   const [text, setText] = useState("");
@@ -31,11 +37,17 @@ export function LibraryBrowser() {
   const [view, setView] = useViewMode("library-view");
   const [groupBy, setGroupBy] = usePersistedState<GroupMode>("library-group", "none");
   const [refreshKey, setRefreshKey] = useState(0);
+  const [pendingRemoval, setPendingRemoval] = useState<Set<string>>(new Set());
+  const removalTimers = useRef<Map<string, ReturnType<typeof setTimeout>>>(new Map());
 
   useEffect(() => {
     api.listDecks().then(setDecks);
   }, []);
 
+  // Cancel any in-flight removal timers on unmount so they don't fire against
+  // an unmounted component.
+  useEffect(() => () => removalTimers.current.forEach(clearTimeout), []);
+
   useEffect(() => {
     const filter: LibraryFilter = {
       text: text.trim() || null,
@@ -54,6 +66,42 @@ export function LibraryBrowser() {
     return () => clearTimeout(t);
   }, [text, commander, colorsInclude, cmcMin, cmcMax, type, subtype, keyword, inDeck, refreshKey]);
 
+  async function adjust(oracleId: string, delta: number) {
+    const qty = await api.addOwned(oracleId, delta);
+    setRows((rs) => rs.map((c) => (c.oracle_id === oracleId ? { ...c, quantity_owned: qty } : c)));
+
+    // Re-adding during the grace period below cancels the pending removal.
+    const timer = removalTimers.current.get(oracleId);
+    if (timer) {
+      clearTimeout(timer);
+      removalTimers.current.delete(oracleId);
+      setPendingRemoval((p) => {
+        const next = new Set(p);
+        next.delete(oracleId);
+        return next;
+      });
+    }
+
+    if (qty <= 0) {
+      // search_library only returns owned (>0) cards — rather than dropping
+      // the row immediately, dim it and give the user a window to undo a
+      // mistaken decrement (via +) before it actually disappears.
+      setPendingRemoval((p) => new Set(p).add(oracleId));
+      removalTimers.current.set(
+        oracleId,
+        setTimeout(() => {
+          setRows((rs) => rs.filter((c) => c.oracle_id !== oracleId));
+          setPendingRemoval((p) => {
+            const next = new Set(p);
+            next.delete(oracleId);
+            return next;
+          });
+          removalTimers.current.delete(oracleId);
+        }, REMOVAL_GRACE_MS),
+      );
+    }
+  }
+
   const deckOrLocation = (c: LibraryCard) =>
     c.decks.length === 0 ? (
       <LocationField
@@ -96,13 +144,20 @@ export function LibraryBrowser() {
               <td className="card-type">{c.type_line}</td>
               <td>{c.mana_value}</td>
               <td className={c.quantity_assigned > c.quantity_owned ? "over-assigned" : ""}>
-                {c.quantity_owned}
-                {c.quantity_assigned > c.quantity_owned && (
-                  <span title="Assigned to more decks than you own">
-                    {" "}
-                    ⚠ {c.quantity_assigned} assigned
-                  </span>
-                )}
+                <span className="row" style={{ gap: 8 }}>
+                  <QtyStepper
+                    value={c.quantity_owned}
+                    onDecrement={() => adjust(c.oracle_id, -1)}
+                    onIncrement={() => adjust(c.oracle_id, 1)}
+                    warn={c.quantity_assigned > c.quantity_owned}
+                    pending={pendingRemoval.has(c.oracle_id)}
+                  />
+                  {c.quantity_assigned > c.quantity_owned && (
+                    <span title="Assigned to more decks than you own">
+                      ⚠ {c.quantity_assigned} assigned
+                    </span>
+                  )}
+                </span>
               </td>
               <td>{deckOrLocation(c)}</td>
             </tr>
@@ -120,13 +175,14 @@ export function LibraryBrowser() {
             key={c.oracle_id}
             card={c}
             corner={
-              <span
-                className={`tile-badge ${c.quantity_assigned > c.quantity_owned ? "warn" : ""}`}
-                title="Copies owned"
-              >
-                ×{c.quantity_owned}
-                {c.quantity_assigned > c.quantity_owned ? " ⚠" : ""}
-              </span>
+              <QtyStepper
+                overlay
+                value={c.quantity_owned}
+                onDecrement={() => adjust(c.oracle_id, -1)}
+                onIncrement={() => adjust(c.oracle_id, 1)}
+                warn={c.quantity_assigned > c.quantity_owned}
+                pending={pendingRemoval.has(c.oracle_id)}
+              />
             }
             footer={deckOrLocation(c)}
           />