diff --git a/src/components/CardRow/CardRow.jsx b/src/components/CardRow/CardRow.jsx
index b756a87..43488df 100644
--- a/src/components/CardRow/CardRow.jsx
+++ b/src/components/CardRow/CardRow.jsx
@@ -19,9 +19,9 @@ function typeBadge(type) {
 
 const PRINTING_COLS = '80px 1fr 150px 100px';
 
-function CardRow({ card }) {
+function CardRow({ card, isMobile }) {
   const { expandedCardId, setExpandedCardId, ownedAmounts } = useContext(CardContext);
-  const isExpanded = expandedCardId === card.id;
+  const isExpanded = !isMobile && expandedCardId === card.id;
 
   const totalOwned = card.printings?.reduce((sum, p) => {
     const key = `${p.set_id}-${p.rarity_id}`;
diff --git a/src/components/FilterBar/FilterBar.jsx b/src/components/FilterBar/FilterBar.jsx
index 329d652..7344bdb 100644
--- a/src/components/FilterBar/FilterBar.jsx
+++ b/src/components/FilterBar/FilterBar.jsx
@@ -9,7 +9,7 @@ const CHIPS = [
 
 function FilterBar({ typeFilter, setTypeFilter, ownedOnly, setOwnedOnly, sortBy, setSortBy }) {
   return (
-    <div style={{ display: 'flex', gap: '8px', alignItems: 'center', flexWrap: 'wrap', margin: '8px 0' }}>
+    <div style={{ display: 'flex', gap: '8px', alignItems: 'center', margin: '8px 0', overflowX: 'auto', whiteSpace: 'nowrap', scrollbarWidth: 'none' }}>
       <div style={{ display: 'flex', gap: '4px' }}>
         {CHIPS.map(({ label, activeClass }) => (
           <button
diff --git a/src/hooks/useMediaQuery.js b/src/hooks/useMediaQuery.js
new file mode 100644
index 0000000..62eedda
--- /dev/null
+++ b/src/hooks/useMediaQuery.js
@@ -0,0 +1,12 @@
+import { useState, useEffect } from 'react';
+
+export function useMediaQuery(query) {
+  const [matches, setMatches] = useState(() => window.matchMedia(query).matches);
+  useEffect(() => {
+    const mq = window.matchMedia(query);
+    const handler = e => setMatches(e.matches);
+    mq.addEventListener('change', handler);
+    return () => mq.removeEventListener('change', handler);
+  }, [query]);
+  return matches;
+}
diff --git a/src/index.css b/src/index.css
index 449dd9a..95c089e 100644
--- a/src/index.css
+++ b/src/index.css
@@ -92,3 +92,43 @@ body {
   transition: background 0.15s;
 }
 .import-modal button:hover { background: #333; }
+
+/* Mobile bottom sheet */
+.sheet-backdrop {
+  position: fixed;
+  inset: 0;
+  background: rgba(0, 0, 0, 0.55);
+  z-index: 100;
+  animation: fadeIn 0.2s ease;
+}
+.bottom-sheet {
+  position: fixed;
+  bottom: 0;
+  left: 0;
+  right: 0;
+  height: 78vh;
+  background: #161616;
+  border-radius: 16px 16px 0 0;
+  border-top: 1px solid #2a2a2a;
+  z-index: 101;
+  overflow-y: auto;
+  animation: slideUp 0.25s ease;
+  padding-bottom: env(safe-area-inset-bottom, 0);
+}
+.sheet-handle {
+  width: 36px;
+  height: 4px;
+  background: #2e2e2e;
+  border-radius: 2px;
+  margin: 10px auto 0;
+}
+@keyframes slideUp {
+  from { transform: translateY(100%); }
+  to   { transform: translateY(0); }
+}
+
+/* Mobile touch targets */
+@media (max-width: 768px) {
+  .icon-btn { width: 30px; height: 30px; font-size: 16px; }
+  .filter-chip { padding: 4px 14px; font-size: 13px; }
+}
diff --git a/src/pages/HomePage.jsx b/src/pages/HomePage.jsx
index c9db9e3..6af36be 100644
--- a/src/pages/HomePage.jsx
+++ b/src/pages/HomePage.jsx
@@ -3,10 +3,12 @@ import { Virtuoso } from 'react-virtuoso';
 import { CardContext } from '../context/CardContext';
 import { fetchCards, fetchCardImage } from '../services/api';
 import { useDebounce } from '../hooks/useDebounce';
+import { useMediaQuery } from '../hooks/useMediaQuery';
 import CardRow from '../components/CardRow/CardRow';
 import SearchBar from '../components/SearchBar/SearchBar';
 import FilterBar from '../components/FilterBar/FilterBar';
 import Footer from '../components/Footer/Footer';
+import PrintingRow from '../components/PrintingRow/PrintingRow';
 
 const BADGE = {
   monster: { background: '#3a2000', color: '#d4820a' },
@@ -22,6 +24,9 @@ function typeBadge(type) {
   return BADGE.other;
 }
 
+const MOBILE_PRINTING_COLS = '60px 1fr 100px 80px';
+const DESKTOP_PRINTING_COLS = '80px 1fr 150px 100px';
+
 function HomePage() {
   const [cards, setCards] = useState([]);
   const [loading, setLoading] = useState(true);
@@ -33,6 +38,7 @@ function HomePage() {
 
   const { expandedCardId, setExpandedCardId, cardImages, setCardImage, ownedAmounts } = useContext(CardContext);
   const [artworkIndex, setArtworkIndex] = useState(0);
+  const isMobile = useMediaQuery('(max-width: 768px)');
   const debouncedSearch = useDebounce(searchTerm, 250);
 
   const loadCards = useCallback(() => fetchCards().then(setCards), []);
@@ -48,7 +54,6 @@ function HomePage() {
     const imageIds = cardImages[expandedCardId]?.ids;
     const imageId = imageIds?.[artworkIndex];
     if (cardImages[expandedCardId]?.blobs[artworkIndex]) return;
-    // imageId may be undefined on first load (ids not yet fetched)
     fetchCardImage(expandedCardId, imageId)
       .then(({ image, image_ids }) => setCardImage(expandedCardId, artworkIndex, image, image_ids))
       .catch(err => console.error('Failed to load card image', err));
@@ -61,14 +66,14 @@ function HomePage() {
     }, 0) ?? 0
   , [ownedAmounts]);
 
+  const expandedCard = cards.find(c => c.id === expandedCardId);
+
   const stats = useMemo(() => ({
     total: cards.length,
     uniqueOwned: cards.filter(c => getTotal(c) > 0).length,
     totalCopies: cards.reduce((s, c) => s + getTotal(c), 0),
   }), [cards, getTotal]);
 
-  const expandedCard = cards.find(c => c.id === expandedCardId);
-
   const filteredCards = useMemo(() => {
     let result = cards;
     if (debouncedSearch) {
@@ -80,7 +85,6 @@ function HomePage() {
       result = result.filter(c => c.type.toLowerCase().includes(q));
     }
     if (ownedOnly) result = result.filter(c => getTotal(c) > 0);
-
     const sorted = [...result];
     if (sortBy === 'owned') sorted.sort((a, b) => getTotal(b) - getTotal(a));
     else sorted.sort((a, b) => a.name.localeCompare(b.name));
@@ -90,18 +94,88 @@ function HomePage() {
   if (loading) return <p style={{ padding: '1rem', color: '#666' }}>Loading cards…</p>;
   if (error)   return <p style={{ padding: '1rem', color: '#c04040' }}>Error: {error}</p>;
 
+  const cardDetailContent = (card) => {
+    if (!card) return null;
+    const imgs = cardImages[card.id];
+    const blob = imgs?.blobs[artworkIndex];
+    const ids = imgs?.ids ?? [];
+    const printingCols = isMobile ? MOBILE_PRINTING_COLS : DESKTOP_PRINTING_COLS;
+    return (
+      <>
+        <div style={{ position: 'relative', width: '100%', display: 'flex', alignItems: 'center', justifyContent: 'center' }}>
+          {blob
+            ? <img src={blob} alt={card.name} style={{ maxWidth: isMobile ? '60%' : '100%' }} />
+            : <div style={{ color: '#444', fontSize: '12px', padding: '2rem' }}>Loading image…</div>
+          }
+          {ids.length > 1 && (
+            <div style={{ position: 'absolute', bottom: '6px', display: 'flex', alignItems: 'center', gap: '8px' }}>
+              <button className="icon-btn" onClick={() => setArtworkIndex(i => Math.max(0, i - 1))} disabled={artworkIndex === 0}>‹</button>
+              <span style={{ fontSize: '11px', color: '#555' }}>{artworkIndex + 1} / {ids.length}</span>
+              <button className="icon-btn" onClick={() => setArtworkIndex(i => Math.min(ids.length - 1, i + 1))} disabled={artworkIndex === ids.length - 1}>›</button>
+            </div>
+          )}
+        </div>
+
+        <div style={{ width: '100%', borderTop: '1px solid #222', paddingTop: '10px', display: 'flex', flexDirection: 'column', gap: '5px' }}>
+          <span style={{ fontSize: '15px', fontWeight: 600, color: '#e0e0e0' }}>{card.name}</span>
+          <div style={{ display: 'flex', gap: '6px', flexWrap: 'wrap' }}>
+            <span style={{ fontSize: '11px', padding: '2px 8px', borderRadius: '10px', fontWeight: 500, ...typeBadge(card.type) }}>{card.type}</span>
+            {card.attribute && <span style={{ fontSize: '11px', padding: '2px 8px', borderRadius: '10px', background: '#202020', color: '#888' }}>{card.attribute}</span>}
+            {card.race    && <span style={{ fontSize: '11px', padding: '2px 8px', borderRadius: '10px', background: '#202020', color: '#888' }}>{card.race}</span>}
+          </div>
+          {card.level    != null && <span style={{ fontSize: '12px', color: '#888' }}>{'★'.repeat(Math.min(card.level, 13))} Lv.{card.level}</span>}
+          {card.link_val != null && <span style={{ fontSize: '12px', color: '#888' }}>Link {card.link_val}</span>}
+        </div>
+
+        {isMobile && card.printings?.length > 0 && (
+          <div style={{ width: '100%', borderTop: '1px solid #222', paddingTop: '6px' }}>
+            <div style={{
+              display: 'grid', gridTemplateColumns: printingCols,
+              gap: '8px', padding: '5px 12px',
+              fontSize: '10px', color: '#444',
+              textTransform: 'uppercase', letterSpacing: '0.05em',
+              borderBottom: '1px solid #222',
+            }}>
+              <span>Code</span><span>Set</span><span>Rarity</span><span>Owned</span>
+            </div>
+            {card.printings.map((printing, i) => (
+              <PrintingRow
+                key={`${card.id}-${printing.set_id}-${printing.rarity_id}`}
+                card_id={card.id}
+                printing={printing}
+                cols={printingCols}
+                zebra={i % 2 === 1}
+              />
+            ))}
+          </div>
+        )}
+      </>
+    );
+  };
+
   return (
     <div style={{ display: 'flex', flexDirection: 'column', height: '100%' }}>
 
       {/* Stats bar */}
       <div style={{
-        display: 'flex', alignItems: 'center', gap: '2rem', padding: '6px 16px', flexShrink: 0,
+        display: 'flex', alignItems: 'center', gap: isMobile ? '1rem' : '2rem',
+        padding: isMobile ? '6px 12px' : '6px 16px', flexShrink: 0,
         background: '#1c1c1c', borderBottom: '1px solid #2a2a2a',
         fontSize: '12px', color: '#666',
       }}>
-        <span><strong style={{ color: '#e0e0e0' }}>{stats.total.toLocaleString()}</strong> cards in DB</span>
-        <span><strong style={{ color: '#e0e0e0' }}>{stats.uniqueOwned.toLocaleString()}</strong> unique owned</span>
-        <span><strong style={{ color: '#e0e0e0' }}>{stats.totalCopies.toLocaleString()}</strong> total copies</span>
+        {isMobile ? (
+          <>
+            <span><strong style={{ color: '#e0e0e0' }}>{stats.total.toLocaleString()}</strong> cards</span>
+            <span><strong style={{ color: '#e0e0e0' }}>{stats.uniqueOwned.toLocaleString()}</strong> owned</span>
+            <span><strong style={{ color: '#e0e0e0' }}>{stats.totalCopies.toLocaleString()}</strong> copies</span>
+          </>
+        ) : (
+          <>
+            <span><strong style={{ color: '#e0e0e0' }}>{stats.total.toLocaleString()}</strong> cards in DB</span>
+            <span><strong style={{ color: '#e0e0e0' }}>{stats.uniqueOwned.toLocaleString()}</strong> unique owned</span>
+            <span><strong style={{ color: '#e0e0e0' }}>{stats.totalCopies.toLocaleString()}</strong> total copies</span>
+          </>
+        )}
         <div style={{ marginLeft: 'auto' }}>
           <Footer onImportComplete={loadCards} />
         </div>
@@ -110,9 +184,9 @@ function HomePage() {
       {/* Main panels */}
       <div style={{ display: 'flex', flex: 1, overflow: 'hidden' }}>
 
-        {/* Left — card list */}
-        <div style={{ flex: 2, display: 'flex', flexDirection: 'column', borderRight: '1px solid #2a2a2a', overflow: 'hidden' }}>
-          <div style={{ padding: '10px 16px', borderBottom: '1px solid #2a2a2a', flexShrink: 0 }}>
+        {/* Card list */}
+        <div style={{ flex: isMobile ? 1 : 2, display: 'flex', flexDirection: 'column', borderRight: isMobile ? 'none' : '1px solid #2a2a2a', overflow: 'hidden' }}>
+          <div style={{ padding: isMobile ? '8px 12px' : '10px 16px', borderBottom: '1px solid #2a2a2a', flexShrink: 0 }}>
             <SearchBar searchTerm={searchTerm} setSearchTerm={setSearchTerm} />
             <FilterBar
               typeFilter={typeFilter} setTypeFilter={setTypeFilter}
@@ -126,68 +200,33 @@ function HomePage() {
           <Virtuoso
             style={{ flex: 1 }}
             data={filteredCards}
-            itemContent={(_, card) => <CardRow card={card} />}
+            itemContent={(_, card) => <CardRow card={card} isMobile={isMobile} />}
           />
         </div>
 
-        {/* Right — card detail */}
-        <div style={{ flex: 1, padding: '16px', overflowY: 'auto', display: 'flex', flexDirection: 'column', alignItems: 'center', gap: '10px' }}>
-          {expandedCard ? (
-            <>
-              {(() => {
-                const imgs = cardImages[expandedCardId];
-                const blob = imgs?.blobs[artworkIndex];
-                const ids = imgs?.ids ?? [];
-                return (
-                  <div style={{ position: 'relative', width: '100%', display: 'flex', alignItems: 'center', justifyContent: 'center' }}>
-                    {blob ? (
-                      <img src={blob} alt={expandedCard.name} style={{ maxWidth: '100%' }} />
-                    ) : (
-                      <div style={{ color: '#444', fontSize: '12px', padding: '2rem' }}>Loading image…</div>
-                    )}
-                    {ids.length > 1 && (
-                      <div style={{ position: 'absolute', bottom: '6px', display: 'flex', alignItems: 'center', gap: '8px' }}>
-                        <button className="icon-btn" onClick={() => setArtworkIndex(i => Math.max(0, i - 1))} disabled={artworkIndex === 0}>‹</button>
-                        <span style={{ fontSize: '11px', color: '#555' }}>{artworkIndex + 1} / {ids.length}</span>
-                        <button className="icon-btn" onClick={() => setArtworkIndex(i => Math.min(ids.length - 1, i + 1))} disabled={artworkIndex === ids.length - 1}>›</button>
-                      </div>
-                    )}
-                  </div>
-                );
-              })()}
-              <div style={{ width: '100%', borderTop: '1px solid #222', paddingTop: '10px', display: 'flex', flexDirection: 'column', gap: '5px' }}>
-                <span style={{ fontSize: '15px', fontWeight: 600, color: '#e0e0e0' }}>{expandedCard.name}</span>
-                <div style={{ display: 'flex', gap: '6px', flexWrap: 'wrap' }}>
-                  <span style={{ fontSize: '11px', padding: '2px 8px', borderRadius: '10px', fontWeight: 500, ...typeBadge(expandedCard.type) }}>
-                    {expandedCard.type}
-                  </span>
-                  {expandedCard.attribute && (
-                    <span style={{ fontSize: '11px', padding: '2px 8px', borderRadius: '10px', background: '#202020', color: '#888' }}>
-                      {expandedCard.attribute}
-                    </span>
-                  )}
-                  {expandedCard.race && (
-                    <span style={{ fontSize: '11px', padding: '2px 8px', borderRadius: '10px', background: '#202020', color: '#888' }}>
-                      {expandedCard.race}
-                    </span>
-                  )}
-                </div>
-                {expandedCard.level != null && (
-                  <span style={{ fontSize: '12px', color: '#888' }}>
-                    {'★'.repeat(Math.min(expandedCard.level, 13))} Lv.{expandedCard.level}
-                  </span>
-                )}
-                {expandedCard.link_val != null && (
-                  <span style={{ fontSize: '12px', color: '#888' }}>Link {expandedCard.link_val}</span>
-                )}
-              </div>
-            </>
-          ) : (
-            <span style={{ color: '#333', fontSize: '13px', marginTop: '2rem' }}>Click a card to see details</span>
-          )}
-        </div>
+        {/* Desktop: right panel */}
+        {!isMobile && (
+          <div style={{ flex: 1, padding: '16px', overflowY: 'auto', display: 'flex', flexDirection: 'column', alignItems: 'center', gap: '10px' }}>
+            {expandedCard
+              ? cardDetailContent(expandedCard)
+              : <span style={{ color: '#333', fontSize: '13px', marginTop: '2rem' }}>Click a card to see details</span>
+            }
+          </div>
+        )}
       </div>
 
+      {/* Mobile: bottom sheet */}
+      {isMobile && expandedCard && (
+        <>
+          <div className="sheet-backdrop" onClick={() => setExpandedCardId(null)} />
+          <div className="bottom-sheet">
+            <div className="sheet-handle" />
+            <div style={{ padding: '12px 16px', display: 'flex', flexDirection: 'column', alignItems: 'center', gap: '12px' }}>
+              {cardDetailContent(expandedCard)}
+            </div>
+          </div>
+        </>
+      )}
     </div>
   );
 }