* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html, body {
            margin: 0;
            padding: 0;
            height: 100%;
            width: 100%;
            overflow-x: hidden;
            font-family: "Noto Sans SC", Arial, sans-serif;
        }
        body {
            background-image: url("https://yuntt.8526586.xyz/robotstxt5/skytop15t.jpg");
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            background-attachment: fixed;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }
        .header {
            position: relative;
            width: 100%;
            padding: 20px;
        }
        .site-name {
            position: absolute;
            top: 10%;
            left: 20px;
            font-size: 80px;
            font-weight: bold;
            color: black;
            text-shadow: 2px 2px 4px rgba(255, 255, 255, 0.5);
            z-index: 10;
        }
        .site-name a {
            text-decoration: none;
            color: black;
        }
        .subtitle {
            position: relative;
            display: inline-block;
            padding: 5px 15px;
            text-align: center;
            font-size: 20px;
            font-weight: bold;
            color: black;
            background-color: rgba(255, 255, 255, 0.8);
            margin-top: 80px;
            align-self: center;
            z-index: 0;
            border-radius: 5px;
        }
        .english-button {
            position: absolute;
            top: 10%;
            right: 20px;
        }
        .english-button a {
            display: inline-block;
            background-color: navy;
            color: white;
            padding: 10px 20px;
            font-size: 18px;
            font-weight: bold;
            text-decoration: none;
            border: 2px solid black;
            border-radius: 5px;
        }
        .navbar {
            margin-top: 20px;
            width: 100%;
            padding: 0 20px;
        }
        .navbar-content {
            display: flex;
            gap: 10px;
            padding: 0 20px;
        }
        .navbar-content ul {
            list-style: none;
            display: flex;
            gap: 10px;
            padding: 0;
            margin: 0;
        }
        .navbar-content li {
            display: inline-block;
        }
        .navbar-content a {
            display: inline-block;
            background-color: rgba(255, 255, 255, 0.5);
            padding: 15px 25px;
            font-size: 24px;
            font-weight: bold;
            color: black;
            text-decoration: none;
            border: 2px solid black;
            border-radius: 5px;
        }
        .main-content {
            flex: 1;
            padding: 10px 20px;
            max-width: 1200px;
            margin: 0 auto;
            width: 100%;
            text-align: center;
        }
        .title {
            display: inline-block;
            text-align: center;
            font-size: 36px;
            font-weight: bold;
            margin: 15px 0 30px 0;
            color: black;
            padding: 5px 15px;
            background-color: rgba(255, 255, 255, 0.8);
            border-radius: 5px;
        }
        .content {
            background-color: rgba(255, 255, 255, 0.8);
            padding: 30px;
            border-radius: 10px;
            margin-bottom: 20px;
            text-align: left;
        }
        .content p {
            font-size: 18px;
            line-height: 1.6;
            margin-bottom: 20px;
            color: black;
        }
        .article-list {
            margin: 30px 0;
            padding: 0 20px;
            list-style: none;
        }
        .article-list li {
            list-style: none;
            margin-bottom: 10px;
        }
        .article-list a {
            display: block;
            background-color: rgba(255, 255, 255, 0.8);
            color: black;
            padding: 10px 20px;
            font-size: 18px;
            font-weight: bold;
            text-decoration: none;
            border: 2px solid black;
            border-radius: 5px;
        }
        .nav-buttons {
            margin: 30px 0;
            padding: 0 20px;
            text-align: left;
        }
        .nav-buttons ul {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .nav-buttons li {
            display: inline-block;
        }
        .nav-buttons a {
            display: inline-block;
            background-color: rgba(255, 255, 255, 0.8);
            color: black;
            padding: 10px 20px;
            font-size: 18px;
            font-weight: bold;
            text-decoration: none;
            border: 2px solid black;
            border-radius: 5px;
        }
        .nav-buttons .thisclass {
            display: inline-block;
            background-color: yellow;
            color: black;
            padding: 10px 20px;
            font-size: 18px;
            font-weight: bold;
            border: 2px solid black;
            border-radius: 5px;
        }
        .nav-buttons .pageinfo {
            display: inline-block;
            background-color: rgba(255, 255, 255, 0.8);
            color: black;
            padding: 10px 20px;
            font-size: 18px;
            font-weight: bold;
            border: 2px solid black;
            border-radius: 5px;
        }
        .footer {
            background-color: rgba(255, 255, 255, 0.8);
            padding: 30px;
            border-radius: 10px;
            text-align: center;
        }
        .copyright {
            font-size: 16px;
            font-weight: bold;
            color: black;
        }
        @media (max-width: 768px) {
            .site-name {
                font-size: 40px;
                top: 5%;
                left: 10px;
            }
            .navbar {
                margin-top: 100px;
            }
            .title {
                font-size: 28px;
            }
            .content {
                padding: 20px;
            }
            .content p {
                font-size: 16px;
            }
        }
        @media (max-width: 480px) {
            .site-name {
                font-size: 30px;
            }
            .navbar {
                margin-top: 80px;
            }
            .navbar-content {
                font-size: 18px;
            }
            .title {
                font-size: 24px;
            }
        }