:root {
            --background-image: url('https://www.loliapi.com/acg/'); /* 背景图片API地址 */
            --modal-overlay-bg: rgba(0, 0, 0, 0.3);
            --modal-content-bg: #ffffff;
            --modal-content-padding: 20px 30px;
            --modal-content-border-radius: 8px;
            --modal-content-max-width: 800px;
            --modal-content-shadow: 0 4px 15px rgba(0,0,0,0.1);
            --modal-close-color: #cccccc;
            --modal-close-hover-color: #000000;
            --modal-image-max-width: 100%;
            --modal-image-border-radius: 4px;
            --heart-font-size: 24px;
            --heart-position: fixed;
            --heart-opacity: 0.8;
            --heart-transition: transform 0.3s ease, opacity 0.3s ease;
            --footer-bg: #f8f8f8;
            --footer-text-color: #555555;
            --button-bg: #007BFF;
            --button-text-color: #ffffff;
            --button-hover-bg: #0056b3;
        }

        body, html {
            margin: 0;
            padding: 0;
            height: 100%;
            background: var(--background-image) no-repeat center center fixed;
            background-size: cover;
            font-family: Arial, sans-serif;
        }

        /* 遮罩层样式 */
        .modal-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: var(--modal-overlay-bg);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 1000;
        }

        .heart:hover {
            transform: scale(1.2);
            opacity: 1;
        }

        /* 头部样式 */
        header {
            text-align: center;
            padding: 20px;
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(10px);
        }

        header h1 {
            margin: 0;
            font-size: 2em;
            color: #333333;
        }

        nav ul {
            list-style: none;
            padding: 0;
            margin: 10px 0 0 0;
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
        }

        nav ul li {
            margin: 5px;
        }

        /* 按钮样式 */
        .btn {
            display: inline-block;
            padding: 12px 25px;
            background-color: var(--button-bg);
            color: var(--button-text-color);
            border: none;
            border-radius: 5px;
            cursor: pointer;
            text-decoration: none;
            font-size: 16px;
            transition: background-color 0.3s ease;
        }

        .btn:hover {
            background-color: var(--button-hover-bg);
        }

        /* 主内容样式 */
        main {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            height: calc(100vh - 200px); /* 假设头部和底部各占100px */
            text-align: center;
            color: #ffffff;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }

        /* 页脚样式 */
        footer {
            background: var(--footer-bg);
            color: var(--footer-text-color);
            padding: 15px;
            text-align: center;
            position: fixed;
            width: 100%;
            bottom: 0;
        }
        
        
        
        
        /* 公告专区  */
        /* 遮罩层样式 */
        #overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 1000;
        }

        /* 弹窗样式 */
        .popup {
            background: #fff;
            padding: 30px;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            max-width: 500px;
            width: 90%;
            text-align: center;
            position: relative;
        }

        /* 弹窗标题样式 */
        .popup h2 {
            margin-top: 0;
            color: #333;
        }

        /* 弹窗内容样式 */
        .popup p {
            font-size: 16px;
            color: #555;
        }

        /* 超链接样式 */
        .popup a {
            color: #1e90ff;
            text-decoration: none;
        }

        .popup a:hover {
            text-decoration: underline;
        }

        /* 按钮样式 */
        .popup .button {
            margin-top: 20px;
            padding: 10px 20px;
            background-color: #1e90ff;
            color: #fff;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-size: 16px;
        }

        .popup .button:hover {
            background-color: #187bcd;
        }