주식 트레이드 핸드폰 화면 UI 개선

src/pages/stock/Stock.css

@@ -539,4 +539,56 @@
     .stock-panel {
         padding: 16px;
     }
+
+    .stock-card {
+        padding: 16px;
+    }
+
+    .stock-status > div {
+        gap: 8px;
+    }
+
+    .stock-status strong {
+        font-size: 14px;
+        word-break: break-word;
+    }
+
+    .stock-balance__summary {
+        grid-template-columns: 1fr;
+    }
+
+    .stock-holdings__item {
+        grid-template-columns: minmax(0, 1fr);
+        gap: 12px;
+        align-items: start;
+    }
+
+    .stock-holdings__name {
+        font-size: 15px;
+    }
+
+    .stock-holdings__metric {
+        grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
+        align-items: center;
+        justify-items: start;
+    }
+
+    .stock-holdings__metric span {
+        font-size: 12px;
+    }
+
+    .stock-holdings__metric strong {
+        font-size: 15px;
+        word-break: break-word;
+    }
+}
+
+@media (max-width: 520px) {
+    .stock-holdings__metric {
+        grid-template-columns: minmax(0, 1fr);
+    }
+
+    .stock-holdings__metric strong {
+        font-size: 14px;
+    }
 }