diff --git a/src/main/kotlin/html4tree/main.kt b/src/main/kotlin/html4tree/main.kt
index b455862..dc97773 100644
--- a/src/main/kotlin/html4tree/main.kt
+++ b/src/main/kotlin/html4tree/main.kt
@@ -310,13 +310,12 @@ fun process_dir(curr_dir: File, excludeSet: Set<String>? = null, dirFiles: Array
               }
               """
 
-    val styleHash = "sha256-" + Base64.getEncoder().encodeToString(MessageDigest.getInstance("SHA-256").digest(cssContent.toByteArray(Charsets.UTF_8)))
+    val exactStyleContent = cssContent.trimIndent()
+    val styleHash = "sha256-" + Base64.getEncoder().encodeToString(MessageDigest.getInstance("SHA-256").digest(exactStyleContent.toByteArray(Charsets.UTF_8)))
 
-    val css = """
-              <style>
-${cssContent}              </style>
-              """
+    val css = """<style>${exactStyleContent}</style>"""
 
+    val displayDirName = curr_dir.getName().ifEmpty { curr_dir.absolutePath }
     val index_top = """<!doctype html>
 <html lang="ko">
      <head>
@@ -327,12 +326,12 @@ ${cssContent}              </style>
         <meta http-equiv="Content-Security-Policy" content="default-src 'none'; style-src '${styleHash}'; base-uri 'none'; form-action 'none';">
         <!-- 보안 향상: 리퍼러를 통한 디렉토리 경로 노출 방지 -->
         <meta name="referrer" content="no-referrer">
-        <title>${curr_dir.getName().escapeHtml()}</title>
+        <title>${displayDirName.escapeHtml()}</title>
         ${css}
      </head>
      <body>
        <main>
-         <h1>${curr_dir.getName().escapeHtml()}</h1>
+         <h1>${displayDirName.escapeHtml()}</h1>
          <nav aria-label="디렉토리 목록">
          <ul role="list">
             <li><a class="dir-link" href="./.." aria-label="상위 디렉토리로 이동" title="상위 디렉토리로 이동"><span class="icon" aria-hidden="true">&#x21B0;</span> <span>..</span></a></li>
diff --git a/src/test/kotlin/html4tree/MainTest.kt b/src/test/kotlin/html4tree/MainTest.kt
index 1349471..f0b5158 100644
--- a/src/test/kotlin/html4tree/MainTest.kt
+++ b/src/test/kotlin/html4tree/MainTest.kt
@@ -520,6 +520,20 @@ class MainTest {
         process_dir(tempDir)
     }
 
+    @Test
+    fun testProcessDirEmptyNameFallback() {
+        val fakeRoot = object : File(tempDir, "fakeRoot") {
+            override fun getName() = ""
+        }
+        fakeRoot.mkdir()
+        process_dir(fakeRoot)
+        val indexFile = File(fakeRoot, "index.html")
+        assertTrue(indexFile.exists())
+        val htmlContent = indexFile.readText()
+        assertTrue(htmlContent.contains("<title>${fakeRoot.absolutePath.escapeHtml()}</title>"))
+        assertTrue(htmlContent.contains("<h1>${fakeRoot.absolutePath.escapeHtml()}</h1>"))
+    }
+
     @Test(expected = IllegalArgumentException::class)
     fun testGoBlankDir() {
         go("   ", -1)
