diff --git a/src/components/VocabCards.tsx b/src/components/VocabCards.tsx
index 388cb8e..ee6d01a 100644
--- a/src/components/VocabCards.tsx
+++ b/src/components/VocabCards.tsx
@@ -4,7 +4,7 @@
  */
 
 import React, { useEffect, useState } from 'react';
-import { BookOpen, ChevronDown, Layers3 } from 'lucide-react';
+import { ArrowLeft, BookOpen, Layers3 } from 'lucide-react';
 import { apiUrl } from '../api';
 
 interface VocabEntry {
@@ -38,7 +38,7 @@ const colorClassFor = (color: string) => {
 
 export const VocabCards: React.FC = () => {
   const [cards, setCards] = useState<VocabCard[]>([]);
-  const [expandedTerm, setExpandedTerm] = useState<string | null>(null);
+  const [selectedCard, setSelectedCard] = useState<VocabCard | null>(null);
   const [status, setStatus] = useState<'loading' | 'ready' | 'error'>('loading');
 
   useEffect(() => {
@@ -68,20 +68,33 @@ export const VocabCards: React.FC = () => {
 
   return (
     <div className="flex-1 overflow-y-auto bg-[#FAF9F6] px-2 py-3 lg:px-6 lg:pb-6">
-      <div className="mx-auto max-w-4xl">
+      <div className="mx-auto max-w-5xl">
         <div className="mb-3 flex items-center justify-between gap-3 rounded-xl border border-[#E8E4DE] bg-[#FDFCFB] px-4 py-3 shadow-sm">
           <div>
             <div className="flex items-center gap-2 font-serif text-lg font-bold text-[#2D2926]">
               <Layers3 className="h-5 w-5 text-[#8B7E74]" />
-              单词卡片
+              {selectedCard ? selectedCard.text : '单词卡片'}
             </div>
-            <div className="mt-1 text-xs text-[#A69F92]">
-              按词合并所有歌词注释
+            {!selectedCard && (
+              <div className="mt-1 text-xs text-[#A69F92]">
+                按词合并所有歌词注释
+              </div>
+            )}
+          </div>
+          {selectedCard ? (
+            <button
+              type="button"
+              onClick={() => setSelectedCard(null)}
+              className="flex items-center gap-1 rounded-full border border-[#E8E4DE] bg-white px-3 py-1.5 text-xs font-semibold text-[#8B7E74] hover:bg-[#FAF9F6]"
+            >
+              <ArrowLeft className="h-3.5 w-3.5" />
+              返回
+            </button>
+          ) : (
+            <div className="rounded-full bg-[#8B7E74]/10 px-3 py-1 text-xs font-semibold text-[#8B7E74]">
+              {cards.length} 词
             </div>
-          </div>
-          <div className="rounded-full bg-[#8B7E74]/10 px-3 py-1 text-xs font-semibold text-[#8B7E74]">
-            {cards.length} 词
-          </div>
+          )}
         </div>
 
         {status === 'loading' && (
@@ -102,65 +115,48 @@ export const VocabCards: React.FC = () => {
           </div>
         )}
 
-        <div className="space-y-2">
-          {cards.map((card) => {
-            const isExpanded = expandedTerm === card.normalizedText;
-            return (
-              <article
-                key={card.normalizedText}
-                className="rounded-xl border border-[#E8E4DE] bg-[#FDFCFB] p-3 shadow-sm"
-              >
-                <button
-                  type="button"
-                  onClick={() => setExpandedTerm(isExpanded ? null : card.normalizedText)}
-                  className="flex w-full items-start justify-between gap-3 text-left"
+        {status === 'ready' && selectedCard && (
+          <div className="space-y-3">
+            <div className={`rounded-xl border p-3 text-sm leading-relaxed ${colorClassFor(selectedCard.latestColor)}`}>
+              {selectedCard.latestComment || '无释义内容'}
+            </div>
+
+            <div className="space-y-2">
+              {selectedCard.entries.map((entry, index) => (
+                <div
+                  key={`${entry.fileName}-${entry.lineNumber}-${index}`}
+                  className="rounded-xl border border-[#E8E4DE]/70 bg-white p-3 shadow-sm"
                 >
-                  <div className="min-w-0">
-                    <div className="font-serif text-xl font-bold text-[#2D2926]">
-                      {card.text}
-                    </div>
-                    <div className="mt-1 flex flex-wrap items-center gap-1.5 text-[11px] text-[#A69F92]">
-                      <span>{card.noteCount} 条注释</span>
-                      <span>·</span>
-                      <span className="truncate">{card.documentTitles.join(' / ')}</span>
-                    </div>
+                  <div className="mb-1 flex items-center gap-1.5 text-xs font-semibold text-[#8B7E74]">
+                    <BookOpen className="h-3.5 w-3.5" />
+                    {entry.documentTitle} · 行 {entry.lineNumber}
+                  </div>
+                  <div className="text-sm leading-relaxed text-[#2D2926]">
+                    {entry.lineText}
+                  </div>
+                  <div className={`mt-2 rounded-lg border px-2 py-1.5 text-sm ${colorClassFor(entry.color)}`}>
+                    {entry.comment}
                   </div>
-                  <ChevronDown
-                    className={`mt-1 h-4 w-4 shrink-0 text-[#8B7E74] transition ${
-                      isExpanded ? 'rotate-180' : ''
-                    }`}
-                  />
-                </button>
-
-                <div className={`mt-2 rounded-lg border p-2 text-sm leading-relaxed ${colorClassFor(card.latestColor)}`}>
-                  {card.latestComment || '无释义内容'}
                 </div>
+              ))}
+            </div>
+          </div>
+        )}
 
-                {isExpanded && (
-                  <div className="mt-3 space-y-2 border-t border-[#E8E4DE]/60 pt-3">
-                    {card.entries.map((entry, index) => (
-                      <div
-                        key={`${entry.fileName}-${entry.lineNumber}-${index}`}
-                        className="rounded-lg border border-[#E8E4DE]/70 bg-white p-2.5"
-                      >
-                        <div className="mb-1 flex items-center gap-1.5 text-[11px] font-semibold text-[#8B7E74]">
-                          <BookOpen className="h-3.5 w-3.5" />
-                          {entry.documentTitle} · 行 {entry.lineNumber}
-                        </div>
-                        <div className="text-xs leading-relaxed text-[#A69F92]">
-                          {entry.lineText}
-                        </div>
-                        <div className={`mt-2 rounded border px-2 py-1.5 text-sm ${colorClassFor(entry.color)}`}>
-                          {entry.comment}
-                        </div>
-                      </div>
-                    ))}
-                  </div>
-                )}
-              </article>
-            );
-          })}
-        </div>
+        {status === 'ready' && !selectedCard && (
+          <div className="grid grid-cols-3 gap-1.5 sm:grid-cols-4 md:grid-cols-5 lg:grid-cols-6 xl:grid-cols-7">
+            {cards.map((card) => (
+                <button
+                  key={card.normalizedText}
+                  type="button"
+                  onClick={() => setSelectedCard(card)}
+                  className="min-h-14 rounded-xl border border-[#E8E4DE] bg-[#FDFCFB] px-2 py-2 text-center font-serif text-base font-bold leading-snug text-[#2D2926] shadow-sm transition hover:border-[#8B7E74]/50 hover:bg-white active:bg-[#E8E4DE]/30 sm:text-lg"
+                >
+                  {card.text}
+                </button>
+            ))}
+          </div>
+        )}
       </div>
     </div>
   );