.ad-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1000;
    background: black; /* 遮罩层，确保首页不可见 */
    display: flex;
    justify-content: center;
    align-items: center;
}

a {
    text-decoration: none;
}

.slideshow {
    width: 100%;
    height: 100%;
    position: absolute;
    overflow: hidden;
}

.slide {
    position: absolute;
    width: 100%;
    height: 100%;
    object-fit: contain;
    opacity: 0;
    transition: opacity 1s ease-in-out;
}

    .slide.active {
        opacity: 1;
    }

.close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(0, 0, 0, 0.6);
    color: #fff;
    border: none;
    padding: 10px 15px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
}