body {
    background-color: #000;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    height: 100vh;
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    color: #fff;
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
    transition: background-image 0.8s ease-in-out;
    overflow: hidden;
}

/* 加载蒙层 */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #000;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s ease;
}

.loading-text {
    margin-top: 15px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
    letter-spacing: 1px;
}