<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>页面未找到 - 图书管理系统</title>
    <link rel="stylesheet" href="{{ url_for('static', filename='css/main.css') }}">
    <link href="https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600&display=swap" rel="stylesheet">
    <style>
        body {
            font-family: 'Poppins', sans-serif;
            background-color: #fff5f7;
            margin: 0;
            padding: 0;
            height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .error-container {
            text-align: center;
            max-width: 650px;
            padding: 40px;
            border-radius: 20px;
            background: #ffffff;
            box-shadow: 0 10px 30px rgba(252, 162, 193, 0.2);
            position: relative;
            overflow: hidden;
        }

        .error-container::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 6px;
            background: linear-gradient(to right, #ff8ab3, #f17ab3, #f56eb8);
        }

        .error-code {
            font-size: 120px;
            font-weight: bold;
            background: linear-gradient(to right, #ff8ab3, #f17ab3, #f56eb8);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin: 0 0 20px 0;
            line-height: 1;
        }

        .error-title {
            font-size: 28px;
            color: #ff8ab3;
            margin-bottom: 15px;
            font-weight: 600;
        }

        .error-message {
            font-size: 18px;
            color: #7a7a7a;
            margin-bottom: 30px;
            line-height: 1.6;
        }

        .back-button {
            display: inline-block;
            padding: 12px 30px;
            background: linear-gradient(to right, #ff8ab3, #f17ab3);
            color: white;
            text-decoration: none;
            border-radius: 50px;
            font-weight: 500;
            letter-spacing: 1px;
            box-shadow: 0 5px 15px rgba(241, 122, 179, 0.4);
            transition: all 0.3s ease;
        }

        .back-button:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(241, 122, 179, 0.6);
        }

        .decoration {
            position: absolute;
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background: rgba(255, 138, 179, 0.1);
        }

        .decoration-1 {
            top: -20px;
            left: -20px;
            width: 120px;
            height: 120px;
        }

        .decoration-2 {
            bottom: -30px;
            right: -30px;
            width: 150px;
            height: 150px;
        }

        .decoration-3 {
            top: 60%;
            left: -40px;
            width: 100px;
            height: 100px;
        }

        .book-icon {
            margin-bottom: 20px;
            width: 80px;
            height: 80px;
            display: inline-block;
            position: relative;
        }

        .book-icon svg {
            fill: #ff8ab3;
        }

        @media (max-width: 768px) {
            .error-code {
                font-size: 100px;
            }
            .error-title {
                font-size: 24px;
            }
            .error-container {
                margin: 0 20px;
                padding: 30px;
            }
        }
    </style>
</head>
<body>
    <div class="error-container">
        <div class="decoration decoration-1"></div>
        <div class="decoration decoration-2"></div>
        <div class="decoration decoration-3"></div>

        <div class="book-icon">
            <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
                <path d="M19 2H6c-1.1 0-2 .9-2 2v16c0 1.1.9 2 2 2h13c1.1 0 2-.9 2-2V4c0-1.1-.9-2-2-2zm0 18H6V4h13v16z"/>
                <path d="M9 5h7v2H9zM9 8h7v2H9zM9 11h7v2H9zM9 14h7v2H9z"/>
            </svg>
        </div>

        <div class="error-code">404</div>
        <div class="error-title">噢！页面不见了～</div>
        <div class="error-message">
            <p>抱歉，您要找的页面似乎藏起来了，或者从未存在过。</p>
            <p>请检查您输入的网址是否正确，或者回到首页继续浏览吧！</p>
        </div>
        <a href="{{ url_for('index') }}" class="back-button">返回首页</a>
    </div>
</body>
</html>
