.footer-ad {
        width: 100%;
        clear: both;
        position: relative;
        height: 938px;
        background-color: #1e1e1e;
        /* 核心：限定背景图属性（无变量，仅保留样式控制） */
        background-size: cover; /* 覆盖容器，保持比例，裁剪多余部分 */
        background-position: center center; /* 始终居中显示 */
        background-repeat: no-repeat;
    }
    .ad-content {
        padding: 300px 0;
        width: 100%;
        height: 100%;
        /* 加遮罩，避免图片过亮导致文字看不清 */
        background: rgba(0,0,0,0.3);
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
    }
    .ad-btn {
        text-decoration: none;
        text-align: center;
    }

    /* 页脚基础样式 */
    .footer-section {
        background-color: #333;
        color: rgba(255, 255, 255, 0.85);
        width: 100%;
        margin-top: 0;
        clear: both;
        overflow: hidden;
    }

    /* 核心内容区 */
    .footer-main {
        padding: 60px 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .footer-core {
        display: flex;
        justify-content: space-between;
        align-items: flex-start;
        gap: 40px;
        flex-wrap: wrap;
        margin-bottom: 40px;
    }

    /* 品牌信息 */
    .footer-brand {
        flex: 1;
        min-width: 300px;
    }
    .footer-logo-img {
        margin-bottom: 20px;
        display: block;
    }
    .footer-desc {
        font-size: 14px;
        line-height: 1.8;
        color: rgba(255, 255, 255, 0.7);
        max-width: 400px;
        margin: 0;
    }

    /* 联系信息 */
    .footer-contact {
        flex: 1;
        min-width: 300px;
        display: flex;
        flex-direction: column;
        gap: 16px;
    }
    .contact-item {
        display: flex;
        align-items: center;
        gap: 12px;
        font-size: 14px;
    }
    .contact-item i {
        color: #3366FF;
        font-size: 16px;
        width: 20px;
        text-align: center;
    }

    /* 微信二维码 - 向下展开，左对齐无遮挡 */
    .weixin-container {
        align-items: flex-start;
        padding-top: 4px;
    }
    .weixin {
        position: relative; 
        color:#fff; 
        font-size: 14px;
        text-decoration: none;
    }
    .weixin img.qrcode {
        position: absolute;
        z-index: 99;
        top: 30px;
        left: 0;
        width: 7.5rem;
        max-width: none;
        height: 7.5rem;
        transform: scale(0);
        transform-origin: top left;
        opacity: 0;
        border: .3125rem solid #000;
        border-radius: .25rem;
        -webkit-transition: all .4s ease-in-out;
        -o-transition: all .4s ease-in-out;
        transition: all .4s ease-in-out;
    }
    .weixin:hover img.qrcode {
        transform: scale(1);
        opacity: 1;
    }

    /* 友情链接样式 */
    .footer-friendlink {
        width: 100%;
    }
    .friendlink-title {
        font-size: 16px;
        color: #fff;
        margin-bottom: 16px;
        font-weight: 600;
    }
    .firendlink {
        list-style: none;
        padding: 0;
        margin: 0;
        display: flex;
        flex-wrap: wrap;
        gap: 16px;
    }
    .firendlink li a {
        color: rgba(255, 255, 255, 0.7);
        font-size: 12px;
        text-decoration: none;
        transition: all 0.3s ease;
    }
    .firendlink li a:hover {
        color: #3366FF;
    }

    /* 版权区 */
    .footer-bottom {
        padding: 24px 0;
    }
    .copyright-info {
        font-size: 12px;
        color: rgba(255, 255, 255, 0.6);
        text-align: center;
        margin: 0;
        line-height: 1.8;
        font-weight: bolder;
    }
    .copyright-info a {
        color: rgba(255, 255, 255, 0.7);
        text-decoration: none;
    }

    /* 回到顶部按钮 */
    .back-to-top {
        position: fixed;
        bottom: 30px;
        right: 30px;
        width: 48px;
        height: 48px;
        border-radius: 50%;
        background-color: #3366FF;
        color: #fff;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 20px;
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
        cursor: pointer;
        transition: all 0.4s ease;
        opacity: 0;
        visibility: hidden;
        z-index: 999;
    }
    .back-to-top.show {
        opacity: 1;
        visibility: visible;
    }
    .back-to-top:hover {
        transform: translateY(-4px);
        box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12);
    }

    /* 加载动画样式 */
    #thim-preloading {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: #fff;
        z-index: 9999;
        justify-content: center;
        align-items: center;
    }
    .custom-image img {
        max-width: 100px;
    }

    /* 响应式适配 - 广告图也做移动端自适应 */
    @media (max-width: 768px) {
        .footer-ad {
            height: 500px !important; /* 移动端缩短广告高度 */
        }
        .ad-content {
            padding: 0 20px;
            background: rgba(0,0,0,0.4); /* 移动端遮罩加深，提升文字可读性 */
        }
        .ad-title {
            font-size: 24px !important;
        }
        .footer-main {
            padding: 40px 0;
        }
        .footer-core {
            flex-direction: column;
            align-items: flex-start;
            gap: 30px;
        }
        .footer-brand, .footer-contact {
            min-width: 100%;
        }
        .footer-desc {
            max-width: 100%;
        }
        .back-to-top {
            width: 40px;
            height: 40px;
            bottom: 20px;
            right: 20px;
            font-size: 16px;
        }
    }

    @media (max-width: 480px) {
        .footer-ad {
            height: 300px !important; /* 小屏手机进一步缩短广告高度 */
        }
        .ad-content {
            padding: 0 10px;
        }
        .ad-title {
            font-size: 20px !important;
            margin-bottom: 20px;
        }
        .footer-main {
            padding: 30px 0;
        }
        .contact-item {
            font-size: 13px;
        }
        .copyright-info {
            font-size: 11px;
        }
    }