diff --git a/templates/index.html b/templates/index.html
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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Secure Site Proxy</title>
+    <style>
+        * {
+            margin: 0;
+            padding: 0;
+            box-sizing: border-box;
+        }
+        
+        body {
+            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
+            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+            min-height: 100vh;
+            display: flex;
+            flex-direction: column;
+            align-items: center;
+            justify-content: center;
+            padding: 20px;
+        }
+        
+        .container {
+            background: white;
+            padding: 40px;
+            border-radius: 15px;
+            box-shadow: 0 20px 60px rgba(0,0,0,0.3);
+            width: 100%;
+            max-width: 700px;
+            animation: fadeIn 0.5s ease-out;
+        }
+        
+        @keyframes fadeIn {
+            from {
+                opacity: 0;
+                transform: scale(0.95);
+            }
+            to {
+                opacity: 1;
+                transform: scale(1);
+            }
+        }
+        
+        .header {
+            text-align: center;
+            margin-bottom: 30px;
+        }
+        
+        .header h1 {
+            font-size: 32px;
+            color: #333;
+            margin-bottom: 10px;
+        }
+        
+        .header p {
+            color: #666;
+            font-size: 14px;
+        }
+        
+        .form-group {
+            margin-bottom: 20px;
+        }
+        
+        label {
+            display: block;
+            margin-bottom: 8px;
+            color: #555;
+            font-weight: 500;
+            font-size: 14px;
+        }
+        
+        .input-wrapper {
+            position: relative;
+            display: flex;
+            gap: 10px;
+        }
+        
+        input[type="url"] {
+            flex: 1;
+            padding: 14px 16px;
+            border: 2px solid #e0e0e0;
+            border-radius: 8px;
+            font-size: 15px;
+            transition: all 0.3s;
+        }
+        
+        input[type="url"]:focus {
+            outline: none;
+            border-color: #667eea;
+            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
+        }
+        
+        button {
+            padding: 14px 30px;
+            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+            color: white;
+            border: none;
+            border-radius: 8px;
+            font-size: 15px;
+            font-weight: 600;
+            cursor: pointer;
+            transition: all 0.3s;
+            white-space: nowrap;
+        }
+        
+        button:hover {
+            transform: translateY(-2px);
+            box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
+        }
+        
+        button:active {
+            transform: translateY(0);
+        }
+        
+        .info-box {
+            background: #f8f9fa;
+            border-left: 4px solid #667eea;
+            padding: 15px;
+            border-radius: 5px;
+            margin-top: 20px;
+        }
+        
+        .info-box h3 {
+            font-size: 14px;
+            color: #333;
+            margin-bottom: 8px;
+        }
+        
+        .info-box ul {
+            list-style: none;
+            padding-left: 0;
+        }
+        
+        .info-box li {
+            font-size: 13px;
+            color: #666;
+            margin-bottom: 5px;
+            padding-left: 20px;
+            position: relative;
+        }
+        
+        .info-box li:before {
+            content: "✓";
+            position: absolute;
+            left: 0;
+            color: #667eea;
+            font-weight: bold;
+        }
+        
+        .footer {
+            margin-top: 20px;
+            display: flex;
+            justify-content: space-between;
+            align-items: center;
+            flex-wrap: wrap;
+            gap: 10px;
+        }
+        
+        .footer a {
+            color: #667eea;
+            text-decoration: none;
+            font-size: 14px;
+            transition: color 0.3s;
+        }
+        
+        .footer a:hover {
+            color: #764ba2;
+        }
+        
+        .stats {
+            font-size: 12px;
+            color: #999;
+        }
+        
+        .error-message {
+            background: #fee;
+            color: #c33;
+            padding: 12px;
+            border-radius: 5px;
+            margin-bottom: 20px;
+            text-align: center;
+            font-size: 14px;
+            border: 1px solid #fcc;
+            display: none;
+        }
+        
+        .error-message.show {
+            display: block;
+            animation: shake 0.5s;
+        }
+        
+        @keyframes shake {
+            0%, 100% { transform: translateX(0); }
+            25% { transform: translateX(-10px); }
+            75% { transform: translateX(10px); }
+        }
+        
+        @media (max-width: 600px) {
+            .container {
+                padding: 25px;
+            }
+            
+            .header h1 {
+                font-size: 24px;
+            }
+            
+            .input-wrapper {
+                flex-direction: column;
+            }
+            
+            button {
+                width: 100%;
+            }
+        }
+    </style>
+</head>
+<body>
+    <div class="container">
+        <div class="header">
+            <h1>🔒 Secure Site Proxy</h1>
+            <p>Access websites securely through encrypted proxy</p>
+        </div>
+        
+        <div id="errorMessage" class="error-message"></div>
+        
+        <form id="proxyForm">
+            <div class="form-group">
+                <label for="targetUrl">Enter URL to access:</label>
+                <div class="input-wrapper">
+                    <input 
+                        type="url" 
+                        id="targetUrl" 
+                        name="url"
+                        placeholder="https://example.com" 
+                        required 
+                        autofocus
+                        pattern="https?://.+"
+                    >
+                    <button type="submit">Access</button>
+                </div>
+            </div>
+        </form>
+        
+        <div class="info-box">
+            <h3>Security Features:</h3>
+            <ul>
+                <li>End-to-end encrypted connection</li>
+                <li>No logging of accessed URLs</li>
+                <li>Automatic content rewriting</li>
+                <li>Protection against private network access</li>
+                <li>Rate limiting and caching</li>
+            </ul>
+        </div>
+        
+        <div class="footer">
+            <a href="/logout">Logout</a>
+            <span class="stats" id="stats">Loading stats...</span>
+        </div>
+    </div>
+    
+    <script>
+        function showError(message) {
+            const errorDiv = document.getElementById('errorMessage');
+            errorDiv.textContent = message;
+            errorDiv.classList.add('show');
+            setTimeout(() => {
+                errorDiv.classList.remove('show');
+            }, 5000);
+        }
+        
+        document.getElementById('proxyForm').addEventListener('submit', function(e) {
+            e.preventDefault();
+            
+            const url = document.getElementById('targetUrl').value.trim();
+            
+            // 基本验证
+            if (!url) {
+                showError('Please enter a URL');
+                return;
+            }
+            
+            if (!url.startsWith('http://') && !url.startsWith('https://')) {
+                showError('URL must start with http:// or https://');
+                return;
+            }
+            
+            // 检查是否是私有地址
+            const privatePatterns = [
+                /^https?:\/\/(localhost|127\.0\.0\.1|0\.0\.0\.0)/i,
+                /^https?:\/\/192\.168\./i,
+                /^https?:\/\/10\./i,
+                /^https?:\/\/172\.(1[6-9]|2[0-9]|3[0-1])\./i,
+            ];
+            
+            for (const pattern of privatePatterns) {
+                if (pattern.test(url)) {
+                    showError('Private network addresses are not allowed');
+                    return;
+                }
+            }
+            
+            // 跳转到代理页面
+            window.location.href = '/proxy?url=' + encodeURIComponent(url);
+        });
+        
+        // 加载统计信息
+        function loadStats() {
+            fetch('/stats')
+                .then(r => r.json())
+                .then(data => {
+                    const sizeMB = (data.size / 1024 / 1024).toFixed(2);
+                    document.getElementById('stats').textContent = 
+                        `Cache: ${data.entries} entries, ${sizeMB} MB`;
+                })
+                .catch(() => {
+                    document.getElementById('stats').textContent = 'Stats unavailable';
+                });
+        }
+        
+        loadStats();
+        setInterval(loadStats, 30000); // 每30秒更新一次
+    </script>
+</body>
+</html>
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