<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html>
<head>
    <title>参数无效</title>
    <style>
        body { font-family: Arial, sans-serif; max-width: 600px; margin: 100px auto; padding: 20px; text-align: center; }
        h1 { color: #e74c3c; }
        .error-box { background: #fdeaea; border: 1px solid #e74c3c; padding: 30px; border-radius: 10px; }
        .info { color: #7f8c8d; margin-top: 20px; }
    </style>
</head>
<body>
    <div class="error-box">
        <h1>🚫 检测到无效参数</h1>
        <p>您的请求包含可疑内容，已被拦截。</p>
        <p class="info">此页面由 ValidationInterceptor 拦截器生成</p>
    </div>
    <p><a href="learn">← 返回学习中心</a></p>
</body>
</html>