/* 底飘广告区域 */
.bottom-ad {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    display: none;
    justify-content: center;
    align-items: center;
    background: #000; /* 背景色，防止图片未加载时显示空白 */
}

.bottom-ad-content {
    position: relative;
    width: 100%;
}

.bottom-ad-link {
    display: block;
    width: 100%;
}

.bottom-ad-img {
    width: 100%;
    height: auto;
    display: block;
}

.bottom-ad-close {
    position: absolute;
    top: 5px;
    right: 10px;
    font-size: 20px;
    font-weight: bold;
    color: #fff;
    cursor: pointer;
    background: rgba(0, 0, 0, 0.5);
    border-radius: 50%;
    width: 30px;
    height: 30px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.bottom-ad-close:hover {
    background: rgba(255, 0, 0, 0.8);
}

/* 仅在移动端显示底飘广告 */
@media (max-width: 768px) {
    .bottom-ad {
        display: flex;
    }
}