body {
            font-family: "楷体", "STKaiti", serif;
            background-color: #f9f4e6;
            color: #333;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            min-height: 100vh;
            margin: 0;
            padding: 20px;
            /*background-image: url('https://img.freepik.com/free-photo/chinese-style-landscape-painting-background_53876-129525.jpg');*/
            background-size: cover;
            background-position: center;
            background-attachment: fixed;
        }
        
        .poem-card {
            background-color: rgba(255, 255, 255, 0.85);
            padding: 40px 60px;
            border-radius: 5px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
            max-width: 600px;
            text-align: center;
            border: 1px solid #d1c7b7;
        }
        
        .poem-title {
            font-size: 2.5em;
            color: #8c2e0b;
            margin-bottom: 10px;
            font-weight: normal;
        }
        
        .poem-author {
            font-size: 1.3em;
            color: #666;
            margin-bottom: 40px;
            font-style: italic;
        }
        
        .poem-content {
            font-size: 1.8em;
            line-height: 2.5;
            margin-bottom: 40px;
        }
        
        .poem-line {
            display: block;
        }
        
        .poem-explanation {
            font-family: "宋体", "SimSun", serif;
            font-size: 1.1em;
            line-height: 1.8;
            text-align: left;
            padding: 20px;
            background-color: rgba(240, 233, 221, 0.7);
            border-left: 3px solid #d1c7b7;
        }
        
        .navigation {
            margin-top: 30px;
            display: flex;
            gap: 20px;
        }
        
        .nav-button {
            padding: 8px 20px;
            background-color: #8c2e0b;
            color: white;
            border: none;
            border-radius: 3px;
            cursor: pointer;
            font-family: "宋体", "SimSun", serif;
            transition: background-color 0.3s;
        }
        
        .nav-button:hover {
            background-color: #6a2208;
        }