<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>404 - 页面未找到</title>
    <style>
        body {
            font-family: 'Arial', sans-serif;
            background-color: #f4f7fa;
            margin: 0;
            padding: 0;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            color: #333;
        }
        .container {
            background-color: #ffffff;
            border-radius: 8px;
            padding: 40px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
            text-align: center;
            max-width: 600px;
            width: 100%;
        }
        h1 {
            font-size: 2.5em;
            color: #d9534f;
            margin: 0;
        }
        .message {
            font-size: 1.1em;
            color: #666;
            margin: 24px 0 30px;
            line-height: 1.6;
        }
        .back-btn {
            background-color: #5cb85c;
            color: white;
            border: none;
            padding: 10px 20px;
            border-radius: 5px;
            text-decoration: none;
            font-size: 1.1em;
            cursor: pointer;
        }
        .back-btn:hover {
            background-color: #4cae4c;
        }
        .back-btn:active {
            background-color: #398439;
        }
        @media (max-width: 768px) {
            .container {
                padding: 30px;
            }
            h1 {
                font-size: 2em;
            }
            .message {
                font-size: 1em;
            }
        }
    </style>
</head>
<body>
    <div class="container">
        <h1>404</h1>
        <p class="message">您访问的页面不存在，地址可能已移除或者输入有误。</p>
        <button class="back-btn" onclick="history.back()">返回上一页</button>
    </div>
</body>
</html>
