diff --git a/login.php b/login.php
new file mode 100644
index 0000000..8883d10
--- /dev/null
+++ b/login.php
@@ -0,0 +1,245 @@
+<?php
+const USER = 'admin';
+const PASS = '123456';
+
+if ($_SERVER['REQUEST_METHOD'] === 'POST') {
+    $username = $_POST['username'] ?? '';
+    $password = $_POST['password'] ?? '';
+    $inputCaptcha = strtoupper($_POST['captcha'] ?? '');
+    $trueCaptcha = strtoupper($_POST['captcha_code'] ?? '');
+
+    $error = '';
+    if ($inputCaptcha !== $trueCaptcha) {
+        $error = '验证码错误';
+    } elseif ($username !== USER || $password !== PASS) {
+        $error = '账号或密码错误';
+    } else {
+        $error = '登录成功！';
+    }
+}
+
+function generateCaptcha() {
+    $chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
+    $captcha = substr(str_shuffle($chars), 0, 5);
+
+    $width = 120;
+    $height = 40;
+    $image = imagecreatetruecolor($width, $height);
+
+    $bgColor = imagecolorallocate($image, 255, 255, 255);
+    $textColor = imagecolorallocate($image, 0, 0, 0);
+
+    imagefilledrectangle($image, 0, 0, $width, $height, $bgColor);
+    imagestring($image, 5, 30, 12, $captcha, $textColor);
+
+    ob_start();
+    imagepng($image);
+    $imgData = ob_get_clean();
+    imagedestroy($image);
+
+    return [
+        'code' => $captcha,
+        'image' => 'data:image/png;base64,' . base64_encode($imgData)
+    ];
+}
+
+$captchaData = generateCaptcha();
+?>
+
+
+<!DOCTYPE html>
+<html lang="zh-CN">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>系统登录 - 安全入口</title>
+    <style>
+        * {
+            margin: 0;
+            padding: 0;
+            box-sizing: border-box;
+            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
+        }
+
+        body {
+            min-height: 100vh;
+            display: flex;
+            justify-content: center;
+            align-items: center;
+            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+        }
+
+        .login-container {
+            background: rgba(255, 255, 255, 0.95);
+            padding: 2.5rem;
+            border-radius: 1rem;
+            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
+            width: 100%;
+            max-width: 400px;
+            transform: translateY(-10%);
+        }
+
+        h2 {
+            text-align: center;
+            color: #2d3748;
+            margin-bottom: 1.8rem;
+            font-size: 1.8rem;
+        }
+
+        .form-group {
+            margin-bottom: 1.5rem;
+        }
+
+        label {
+            display: block;
+            margin-bottom: 0.5rem;
+            color: #4a5568;
+            font-weight: 600;
+        }
+
+        input {
+            width: 100%;
+            padding: 0.8rem;
+            border: 2px solid #e2e8f0;
+            border-radius: 0.5rem;
+            font-size: 1rem;
+            transition: border-color 0.3s ease;
+        }
+
+        input:focus {
+            outline: none;
+            border-color: #667eea;
+            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
+        }
+
+        .captcha-group {
+            display: flex;
+            gap: 1rem;
+            align-items: center;
+        }
+
+        .captcha-img {
+            border-radius: 0.5rem;
+            border: 2px solid #e2e8f0;
+            cursor: pointer;
+            transition: transform 0.2s ease;
+        }
+
+        .captcha-img:hover {
+            transform: scale(1.05);
+        }
+
+        button {
+            width: 100%;
+            padding: 1rem;
+            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+            color: white;
+            border: none;
+            border-radius: 0.5rem;
+            font-size: 1rem;
+            font-weight: 600;
+            cursor: pointer;
+            transition: transform 0.2s ease, opacity 0.2s ease;
+        }
+
+        button:hover {
+            transform: translateY(-2px);
+            opacity: 0.9;
+        }
+
+        .error {
+            padding: 1rem;
+            margin-bottom: 1.5rem;
+            background: #fff5f5;
+            color: #c53030;
+            border: 2px solid #fed7d7;
+            border-radius: 0.5rem;
+            font-weight: 500;
+            display: flex;
+            align-items: center;
+            gap: 0.8rem;
+        }
+
+        .error::before {
+            content: '!';
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            width: 1.5rem;
+            height: 1.5rem;
+            background: #c53030;
+            color: white;
+            border-radius: 50%;
+            font-weight: bold;
+        }
+
+        .success {
+            background: #f0fff4;
+            color: #2f855a;
+            border-color: #c6f6d5;
+        }
+
+        .success::before {
+            content: '✓';
+            background: #48bb78;
+        }
+    </style>
+</head>
+<body>
+<div class="login-container">
+    <h2>系统安全登录</h2>
+
+    <?php if (!empty($error)): ?>
+        <div class="error <?= strpos($error, '成功') !== false ? 'success' : '' ?>">
+            <?= $error ?>
+        </div>
+    <?php endif; ?>
+
+    <form method="post">
+        <div class="form-group">
+            <label for="username">账号</label>
+            <input
+                    type="text"
+                    id="username"
+                    name="username"
+                    required
+                    placeholder="请输入您的账号"
+            >
+        </div>
+
+        <div class="form-group">
+            <label for="password">密码</label>
+            <input
+                    type="password"
+                    id="password"
+                    name="password"
+                    required
+                    placeholder="请输入您的密码"
+            >
+        </div>
+
+        <div class="form-group">
+            <label>验证码</label>
+            <div class="captcha-group">
+                <input
+                        type="text"
+                        name="captcha"
+                        required
+                        placeholder="输入右侧验证码"
+                        style="flex: 1;"
+                >
+                <img
+                        src="<?= $captchaData['image'] ?>"
+                        class="captcha-img"
+                        title="点击刷新验证码"
+                        onclick="this.src='<?= $captchaData['image'] ?>?t='+Date.now()"
+                >
+                <input type="hidden" name="captcha_code" value="<?= $captchaData['code'] ?>">
+            </div>
+        </div>
+
+        <button type="submit">立即登录</button>
+    </form>
+</div>
+</body>
+</html>
