diff --git a/tools/gen-cardhand.mjs b/tools/gen-cardhand.mjs
index 1653e88..e63652b 100644
--- a/tools/gen-cardhand.mjs
+++ b/tools/gen-cardhand.mjs
@@ -231,17 +231,20 @@ if (txt.includes('/ui/DefaultGroup/CardHand')) {
   process.exit(0);
 }
 
-const matches = txt.match(/\n {4}\]/g); // Entities 닫는 대괄호(4-space indent)는 파일 내 유일
-if (!matches || matches.length !== 1) {
-  console.error(`Expected exactly one Entities closing bracket, found ${matches ? matches.length : 0}. Aborting.`);
+const eol = txt.includes('\r\n') ? '\r\n' : '\n'; // 기존 파일의 줄바꿈 보존
+const splicePoint = `${eol}    ]`; // Entities 닫는 대괄호(4-space indent)
+
+const count = txt.split(splicePoint).length - 1;
+if (count !== 1) {
+  console.error(`Expected exactly one Entities closing bracket, found ${count}. Aborting.`);
   process.exit(1);
 }
 
 const blocks = ents
-  .map((e) => JSON.stringify(e, null, 2).split('\n').map((l) => '      ' + l).join('\n'))
-  .join(',\n');
+  .map((e) => JSON.stringify(e, null, 2).split('\n').map((l) => '      ' + l).join(eol))
+  .join(',' + eol);
 
-txt = txt.replace('\n    ]', ',\n' + blocks + '\n    ]');
+txt = txt.replace(splicePoint, ',' + eol + blocks + eol + '    ]');
 
 JSON.parse(txt); // 유효성 검증 (실패 시 throw)