diff --git a/internal/app/middleware/swagger.go b/internal/app/middleware/swagger.go
index 97699ae..db07e06 100644
--- a/internal/app/middleware/swagger.go
+++ b/internal/app/middleware/swagger.go
@@ -16,7 +16,15 @@ import (
 // branding CSS injected into swagger-ui.css.
 func SwaggerHandler() gin.HandlerFunc {
 	return func(c *gin.Context) {
-		isCSS := strings.HasSuffix(c.Request.URL.Path, "swagger-ui.css")
+		rawPath := c.Request.URL.Path
+		relPath := strings.TrimPrefix(rawPath, "/swagger")
+		if relPath == "" || relPath == "/" {
+			relPath = "/index.html"
+		}
+		c.Request.URL.Path = relPath
+		defer func() { c.Request.URL.Path = rawPath }()
+
+		isCSS := strings.HasSuffix(relPath, "swagger-ui.css")
 
 		underlying := c.Writer
 		crw := &captureResponseWriter{