/* 毛玻璃通栏样式 */
.top-bar {
    position: fixed;
    top: -55px; /* 初始隐藏位置 */
    left: 0;
    right: 0;
    height: 55px;
    background: rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(7px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 1px 0px rgba(0, 0, 0, 0.1);
    transition: top 0.4s ease-in-out;
    z-index: 1000;
}

/* 显示状态 */
.top-bar.active {
    top: 0;
}