<!DOCTYPE html>
<html lang="ko" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>404 Not Found</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background: #0f172a;
            color: #e5e7eb;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
        }
        .box {
            text-align: center;
        }
        h1 {
            font-size: 72px;
            margin-bottom: 10px;
        }
        p {
            font-size: 18px;
            opacity: 0.8;
        }
    </style>
</head>
<body>
<div class="box">
    <h1>404</h1>
    <p>페이지를 찾을 수 없습니다.</p>
</div>
</body>
</html>