diff --git a/backend/controllers/wechatcallback/page.go b/backend/controllers/wechatcallback/page.go
index 91c4f28..8599eb4 100644
--- a/backend/controllers/wechatcallback/page.go
+++ b/backend/controllers/wechatcallback/page.go
@@ -7,6 +7,7 @@ import (
 	"encoding/base64"
 	"html/template"
 	"net/http"
+	"strings"
 )
 
 // 页面随主程序发布，无需外部字体、脚本或手机浏览器登录状态。
@@ -15,7 +16,14 @@ import (
 var pageHTML string
 
 //go:embed page.css
-var pageCSS string
+var embeddedCSS string
+
+var pageCSS = normalizeStyle(embeddedCSS)
+
+// 与浏览器解析内嵌样式时的换行规则一致，避免跨平台构建导致摘要不匹配。
+func normalizeStyle(css string) string {
+	return strings.ReplaceAll(strings.ReplaceAll(css, "\r\n", "\n"), "\r", "\n")
+}
 
 var resultTemplate = template.Must(template.New("wechat-result").Parse(pageHTML))
 
diff --git a/backend/controllers/wechatcallback/page_test.go b/backend/controllers/wechatcallback/page_test.go
index 4d9f8d2..8bf0445 100644
--- a/backend/controllers/wechatcallback/page_test.go
+++ b/backend/controllers/wechatcallback/page_test.go
@@ -7,6 +7,8 @@ import (
 	"net/http/httptest"
 	"strings"
 	"testing"
+
+	"golang.org/x/net/html"
 )
 
 func TestWriteAuthorizationResult(t *testing.T) {
@@ -57,6 +59,38 @@ func TestWriteAuthorizationResult(t *testing.T) {
 	}
 }
 
+func TestStyleHashAfterHTMLParsing(t *testing.T) {
+	for name, lineEnding := range map[string]string{"LF": "\n", "CRLF": "\r\n", "CR": "\r"} {
+		t.Run(name, func(t *testing.T) {
+			original := pageCSS
+			defer func() { pageCSS = original }()
+			pageCSS = normalizeStyle(strings.ReplaceAll(original, "\n", lineEnding))
+			for _, authorized := range []bool{true, false} {
+				response := httptest.NewRecorder()
+				Write(response, authorized)
+				tokenizer := html.NewTokenizer(strings.NewReader(response.Body.String()))
+				var styles []string
+				for token := tokenizer.Next(); token != html.ErrorToken; token = tokenizer.Next() {
+					if token == html.StartTagToken && tokenizer.Token().Data == "style" {
+						if tokenizer.Next() != html.TextToken {
+							t.Fatal("内嵌样式必须包含有效文本")
+						}
+						styles = append(styles, tokenizer.Token().Data)
+					}
+				}
+				if len(styles) != 1 || styles[0] != original {
+					t.Fatal("浏览器解析后的样式必须与规范化样式一致")
+				}
+				digest := sha256.Sum256([]byte(styles[0]))
+				expected := "style-src 'sha256-" + base64.StdEncoding.EncodeToString(digest[:]) + "'"
+				if !strings.Contains(response.Header().Get("Content-Security-Policy"), expected) {
+					t.Fatal("安全策略必须允许浏览器实际解析出的样式摘要")
+				}
+			}
+		})
+	}
+}
+
 func TestWriteResultSecurityHeaders(t *testing.T) {
 	for _, authorized := range []bool{true, false} {
 		response := httptest.NewRecorder()