diff --git a/index.html b/index.html
index 758464e..fc8d33e 100644
--- a/index.html
+++ b/index.html
@@ -6,7 +6,8 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>ITAM 자산관리 ERP</title>
     <link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/variable/pretendardvariable.min.css" />
-    <link rel="stylesheet" href="/src/style.css" />
+    <link rel="stylesheet" href="/src/styles/common.css" />
+    <link rel="stylesheet" href="/src/styles/modal.css" />
     <script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
     <script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-datalabels@2.0.0"></script>
   </head>
diff --git a/src/style.css b/src/styles/common.css
similarity index 78%
rename from src/style.css
rename to src/styles/common.css
index 7f0e5c4..f7bc4e0 100644
--- a/src/style.css
+++ b/src/styles/common.css
@@ -304,59 +304,6 @@ tbody tr:hover { background-color: var(--bg-color); }
   text-align: center;
 }
 
-/* Modal */
-.modal-overlay {
-  position: fixed;
-  top: 0; left: 0; right: 0; bottom: 0;
-  background-color: rgba(0, 0, 0, 0.4);
-  display: flex;
-  align-items: center;
-  justify-content: center;
-  z-index: 1000;
-  opacity: 0;
-  visibility: hidden;
-  transition: opacity 0.2s ease, visibility 0.2s ease;
-}
-
-.modal-overlay:not(.hidden) { opacity: 1; visibility: visible; }
-.modal-content {
-  background-color: var(--white);
-  width: 100%; max-width: 600px;
-  border-radius: 8px;
-  overflow: hidden;
-  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
-  transform: translateY(20px);
-  transition: transform 0.2s ease;
-}
-.modal-overlay:not(.hidden) .modal-content { transform: translateY(0); }
-.modal-header {
-  background-color: var(--primary-color);
-  color: var(--white);
-  padding: 1rem 1.5rem;
-  display: flex;
-  justify-content: space-between;
-  align-items: center;
-}
-.modal-header h2 { font-size: 1.125rem; font-weight: 500; }
-.modal-body { padding: 1.5rem; }
-.grid-form { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
-.form-group { display: flex; flex-direction: column; gap: 0.375rem; }
-.form-group.full-width { grid-column: span 2; }
-.form-group label { font-size: 0.875rem; font-weight: 500; }
-.form-group input, .form-group textarea {
-  padding: 0.625rem;
-  border: 1px solid var(--border-color);
-  border-radius: 4px;
-  font-family: inherit; font-size: 0.875rem;
-  outline: none; transition: border-color 0.2s;
-}
-.form-group input:focus, .form-group textarea:focus { border-color: var(--primary-color); }
-.modal-footer {
-  padding: 1rem 1.5rem; border-top: 1px solid var(--border-color);
-  display: flex; justify-content: space-between; align-items: center;
-}
-.footer-actions { display: flex; gap: 0.5rem; }
-
 /* Search Filter Bar */
 .search-bar {
   display: flex;
@@ -416,4 +363,3 @@ tbody tr:hover { background-color: var(--bg-color); }
   font-size: 0.875rem;
   color: var(--text-muted);
 }
-
diff --git a/src/styles/modal.css b/src/styles/modal.css
new file mode 100644
index 0000000..83e142c
--- /dev/null
+++ b/src/styles/modal.css
@@ -0,0 +1,65 @@
+/* Modal */
+.modal-overlay {
+  position: fixed;
+  top: 0; left: 0; right: 0; bottom: 0;
+  background-color: rgba(0, 0, 0, 0.4);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 1000;
+  opacity: 0;
+  visibility: hidden;
+  transition: opacity 0.2s ease, visibility 0.2s ease;
+}
+
+.modal-overlay:not(.hidden) { opacity: 1; visibility: visible; }
+
+.modal-content {
+  background-color: var(--white);
+  width: 100%; max-width: 600px;
+  border-radius: 8px;
+  overflow: hidden;
+  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
+  transform: translateY(20px);
+  transition: transform 0.2s ease;
+}
+
+.modal-overlay:not(.hidden) .modal-content { transform: translateY(0); }
+
+.modal-header {
+  background-color: var(--primary-color);
+  color: var(--white);
+  padding: 1rem 1.5rem;
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+}
+
+.modal-header h2 { font-size: 1.125rem; font-weight: 500; }
+
+.modal-body { padding: 1.5rem; }
+
+.grid-form { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
+
+.form-group { display: flex; flex-direction: column; gap: 0.375rem; }
+
+.form-group.full-width { grid-column: span 2; }
+
+.form-group label { font-size: 0.875rem; font-weight: 500; }
+
+.form-group input, .form-group textarea {
+  padding: 0.625rem;
+  border: 1px solid var(--border-color);
+  border-radius: 4px;
+  font-family: inherit; font-size: 0.875rem;
+  outline: none; transition: border-color 0.2s;
+}
+
+.form-group input:focus, .form-group textarea:focus { border-color: var(--primary-color); }
+
+.modal-footer {
+  padding: 1rem 1.5rem; border-top: 1px solid var(--border-color);
+  display: flex; justify-content: space-between; align-items: center;
+}
+
+.footer-actions { display: flex; gap: 0.5rem; }