/* 创建毛玻璃覆盖层 */
#web_bg::after {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(0px);
    -webkit-backdrop-filter: blur(0px);
    background-color: rgba(255, 255, 255, 0);
}

/* 滚动时激活效果 */
body.scrolled #web_bg::after {
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    background-color: rgba(255, 255, 255, 0.6);
}

/* 适配夜间模式 */
[data-theme="dark"] body.scrolled #web_bg::after {
    background-color: rgba(0, 0, 0, 0.5);
}

/* 保持背景图片可见 */
#web_bg .bg {
    z-index: -2;
}