diff --git a/app/templates/login.html b/app/templates/login.html
index d6caca2..c5bfd43 100644
--- a/app/templates/login.html
+++ b/app/templates/login.html
@@ -6,11 +6,11 @@
 <h2>🔐 登录信息</h2>
 <form method="post" action="/login">
     <div class="mb-3">
-        <label for="user" class="form-label">用户名</label>
+        <label for="user" class="form-label" id="user-label">用户名</label>
         <input type="text" class="form-control" id="user" name="user">
     </div>
     <div class="mb-3">
-        <label for="pw" class="form-label">密码</label>
+        <label for="pw" class="form-label" id="pw-label">密码</label>
         <input type="password" class="form-control" id="pw" name="pw">
     </div>
         <div class="mb-3">
@@ -38,4 +38,31 @@
 {% if message %}
 <div class="alert alert-{{ 'success' if success else 'danger' }} mt-4">{{ message }}</div>
 {% endif %}
-{% endblock %}
\ No newline at end of file
+<script>
+    document.addEventListener('DOMContentLoaded', () => {
+        const tokenInput = document.getElementById('token');
+        const inputs = [document.getElementById('user'), document.getElementById('pw')];
+        const labels = [document.getElementById('user-label'), document.getElementById('pw-label')];
+        const fieldClasses = ['bg-body-secondary', 'text-body-secondary', 'text-decoration-line-through'];
+
+        function toggleCredFields() {
+            const inactive = tokenInput.value.trim() !== '';
+            inputs.forEach(el => {
+                el.readOnly = inactive;
+                el.tabIndex = inactive ? -1 : 0;
+                el.style.pointerEvents = inactive ? 'none' : '';
+                if (inactive && document.activeElement === el) {
+                    el.blur();
+                }
+                fieldClasses.forEach(cls => el.classList.toggle(cls, inactive));
+            });
+            labels.forEach(el => {
+                ['text-decoration-line-through', 'text-body-secondary'].forEach(cls => el.classList.toggle(cls, inactive));
+            });
+        }
+
+        tokenInput.addEventListener('input', toggleCredFields);
+        toggleCredFields();
+    });
+</script>
+{% endblock %}