diff --git a/certificate.html b/certificate.html
index 640d103..05a5479 100644
--- a/certificate.html
+++ b/certificate.html
@@ -2,7 +2,7 @@
 <html lang="zh-CN">
 <head>
   <meta charset="UTF-8">
-  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
   <title>合格证信息</title>
   <style>
     * {
@@ -15,13 +15,43 @@
       font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
       background-color: #f5f5f5;
       color: #333;
+      /* 防止iOS触摸拖动 */
+      -webkit-overflow-scrolling: touch;
+      overflow-x: hidden;
+      position: relative;
+      touch-action: manipulation;
+    }
+    
+    /* 防止iOS设备上的弹性滚动 */
+    html, body {
+      height: 100%;
+      overflow: hidden;
+      overscroll-behavior: none;
+    }
+    
+    /* 防止弹窗背景滚动 */
+    .modal {
+      /* 防止iOS触摸事件穿透 */
+      -webkit-touch-callout: none;
+      -webkit-user-select: none;
+      -khtml-user-select: none;
+      -moz-user-select: none;
+      -ms-user-select: none;
+      user-select: none;
+    }
+    
+    /* 防止按钮等元素的默认触摸行为 */
+    button, input, canvas {
+      touch-action: manipulation;
     }
 
     .container {
       max-width: 480px;
       margin: 0 auto;
       background-color: white;
-      min-height: 100vh;
+      height: 100%;
+      overflow-y: auto;
+      -webkit-overflow-scrolling: touch;
       position: relative;
     }
 
@@ -421,36 +451,36 @@
       <div class="modal-body">
         <form id="certificateForm">
           <div class="form-group">
-          <label for="subjectName">主体名称：</label>
+          <label for="subjectName">主体名称：<span style="color: red;">*</span></label>
           <input type="text" id="subjectName" name="subjectName" required>
         </div>
         <div class="form-group">
-          <label for="productName">产品名称：</label>
+          <label for="productName">产品名称：<span style="color: red;">*</span></label>
           <input type="text" id="productName" name="productName" required>
         </div>
         <div class="form-group">
-          <label for="weight">产品重量：</label>
+          <label for="weight">产品重量：<span style="color: red;">*</span></label>
           <input type="text" id="weight" name="weight" required>
         </div>
         <div class="form-group">
-          <label for="basis">承诺依据：</label>
+          <label for="basis">承诺依据：<span style="color: red;">*</span></label>
           <input type="text" id="basis" name="basis" value="质量安全控制符合要求" required>
         </div>
         <div class="form-group">
-          <label for="origin">产地：</label>
+          <label for="origin">产地：<span style="color: red;">*</span></label>
           <input type="text" id="origin" name="origin" required>
         </div>
         <div class="form-group">
-          <label for="contact">联系方式：</label>
+          <label for="contact">联系方式：<span style="color: red;">*</span></label>
           <input type="tel" id="contact" name="contact" required pattern="^1[3-9]\d{9}$" title="请输入11位手机号码">
         </div>
         <div class="form-group">
-          <label for="date">开具日期：</label>
+          <label for="date">开具日期：<span style="color: red;">*</span></label>
           <input type="date" id="date" name="date" required>
         </div>
-          <div class="form-group">
-            <label>手写签名：</label>
-            <div class="signature-container">
+        <div class="form-group">
+          <label>手写签名：<span style="color: red;">*</span></label>
+          <div class="signature-container">
               <canvas id="signatureCanvas" width="300" height="150"></canvas>
               <div class="signature-actions">
                 <button type="button" onclick="clearSignature()">清除</button>
@@ -560,14 +590,30 @@
       container.innerHTML = html;
     }
     
+    // 禁用外部滚轮
+    function disableExternalScroll() {
+      // 保存原始的overflow值
+      document.body.style.overflow = 'hidden';
+    }
+    
+    // 恢复外部滚轮
+    function enableExternalScroll() {
+      // 恢复原始的overflow值
+      document.body.style.overflow = '';
+    }
+    
     function openModal() {
       document.getElementById('modal').classList.add('show');
+      // 禁用外部滚轮
+      disableExternalScroll();
       // 初始化签名画布
       initSignatureCanvas();
     }
     
     function closeModal() {
       document.getElementById('modal').classList.remove('show');
+      // 恢复外部滚轮
+      enableExternalScroll();
     }
     
     // 点击弹窗外部关闭
