:root {
            --main-padding: clamp(20px, 5vw, 40px);
            --title-size: clamp(1.5rem, 6vw, 2.5rem);
            --text-size: clamp(0.9rem, 3vw, 1.1rem);
            --link-size: clamp(1rem, 4vw, 1.2rem);
        }
        
        body {
            display: flex;
            justify-content: center;
            align-items: center;
            background-color: #000;
            background-image: url(/bg.png);
            background-repeat: no-repeat;
            background-position: center center;
            background-size: 50%;
            background-attachment: fixed;
            -webkit-backdrop-filter: blur(10px);
            backdrop-filter: blur(10px);
            min-height: 100vh;
            margin: 0;
            padding: var(--main-padding);
            box-sizing: border-box;
            font-family: 'Exo', sans-serif;
        }
        
        main {
            width: min(100%, 800px);
            color: white;
            padding: var(--main-padding);
            border: 1px solid rgba(255, 255, 255, 0.2);
            background-color: rgba(63, 63, 63, 0.5);
            border-radius: 10px;
            -webkit-backdrop-filter: blur(10px);
            backdrop-filter: blur(10px);
            box-shadow: 0 0 20px rgba(255, 255, 255, 0.1);
        }
        
        h1 {
            font-size: var(--title-size);
            text-align: center;
            margin-bottom: 1.5rem;
            font-weight: 400;
        }
        
        h4 {
            font-weight: 350;
            margin: 1.5rem 0 0.5rem;
            font-size: var(--link-size);
        }
        
        p {
            font-size: var(--text-size);
            line-height: 1.6;
            margin: 0.5rem 0;
        }
        
        .crossline {
            height: 1px;
            background-color: rgba(255, 255, 255, 0.2);
            margin: 1.5rem 0;
        }
        
                a {
        color: white;
        text-decoration: none;
    font-size: var(--link-size);
    transition: all 0.3s cubic-bezier(0.39, 0.575, 0.565, 1); /* sine out 曲线 */
    white-space: nowrap;
    position: relative;
    padding-bottom: 3px; /* 为下划线留出空间 */
}


a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background-color: white;
    transition: all 0.3s cubic-bezier(0.39, 0.575, 0.565, 1); /* sine out 曲线 */
}

    a:hover::after {
        width: 100%;
}
        
        
        .back-link {
            display: block;
            text-align: center;
            color: #fff;
        }
        
        .black-bg {
            word-break: break-all;
            background-color: rgba(0, 0, 0, 0.3);
            padding: 0.5rem;
            border-radius: 5px;
            display: inline-block;
            margin: 0.3rem 0;
        }
        
        .contact-link {
            display: inline-block;
            margin: 0.5rem 0;
            padding: 0.5rem 1rem;
            background-color: rgba(255, 255, 255, 0.1);
            border-radius: 5px;
        }