body {
    margin: 0;
    padding: 0;
    height: 100vh;
    min-height: 200px;
    background-size: cover;
    background-position: center;
    background-attachment: fixed; 
    transition: background-image 1s ease-in-out;
    display: flex; /* 使用flexbox布局 */
    align-items: center; /* 垂直居中 */
    justify-content: center; /* 水平居中 */
}

#panel_1 {
    background-color: rgba(255, 255, 255, 0.7); /* 半透明亚克力板效果 */
    width: 100%;
    max-width: 80%;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
    word-wrap: break-word; /* 确保文本自动换行 */
    box-sizing: border-box; /* 确保padding和border包含在width和height内 */
    min-height: 200px; /* 设置最小高度 */
    margin: auto; /* 确保与页面边框保持一定距离 */
}

#panel_1 h1 {
    margin: 20px auto;
    text-align: center; 
    font-size: 2em;
}

#panel_1 p {
    line-height: 1.6;
    font-size: 1.2em;
}

#panel_1 img, video {
    width: 90%;
    max-width: 100%;
    height: auto;
    display: block;
    margin: 20px auto;
}

#panel_1 audio {
    display: block;
    margin: 20px auto;
    max-width: 100%;
}

#panel_1 hr {
    border: none;
    border-top: 2px solid #888888;
    max-width: 60%;
    margin: 20px auto;
}

#panel_1 .igtext {
    text-align: center; 
    font-style: italic;
    color: #666666; 
    font-size: 1em;
}