// ... 头部样式保持不变 ...
<meta charset="UTF-8">
<style>
    .container {
        /* 添加阴影效果 */
        box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        transition: transform 0.2s ease;
    }
    button:hover {
        background: #0056b3;
        transform: translateY(-1px);
    }
    button:active {
        transform: translateY(1px);
    }
    input:focus {
        border-color: #007bff;
        outline: none;
    }
    /* 新增链接区域样式 */
    .link-grid {
        margin-top: 2rem;
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
        gap: 10px;
    }
    .page-link {
        padding: 8px;
        background: white;
        border: 1px solid #ddd;
        border-radius: 4px;
        transition: all 0.2s;
    }
    .page-link:hover {
        background: #f8f9fa;
        transform: translateY(-2px);
    }
</style>

// ... body部分保持不变直到消息div之后 ...

    <div class="container">
        <h1>页面导航系统</h1>
        <input type="text" id="pageInput" placeholder="输入1-20页码">
        <button onclick="navigate()">立即跳转</button>
        <div id="message"></div>
        
        <!-- 新增预设链接区域 -->
        <div class="link-grid" id="pageLinks"></div>
    </div>

<script>
    // 在脚本开头添加页面数量配置
    const MAX_PAGE = 100;

    function navigate() {
        // 修改验证逻辑
        if (!/^\d+$/.test(input) || input < 1 || input > MAX_PAGE) {
            messageDiv.textContent = `请输入1-${MAX_PAGE}之间的有效数字`;
            return;
        }

        // 修改错误提示
        img.onerror = () => {
            messageDiv.textContent = `页面${input}暂未开放`;
        };
    }

    // 新增：动态生成页面链接
    window.onload = () => {
        const linkContainer = document.getElementById('pageLinks');
        for (let i = 1; i <= MAX_PAGE; i++) {
            const link = document.createElement('a');
            link.className = 'page-link';
            link.href = `page${i}.html`;
            link.textContent = `Page ${i}`;
            linkContainer.appendChild(link);
        }
    };
</script>