ul { list-style: none; }
.aboutAd {
    height: 380px;
    background: url(/static/zhanpc/images/about/ad3.png) center / cover no-repeat;
    position: relative;
    margin-top: 70px;
}
.aboutAd .box {
    height: 100%;
    background: rgba(33, 41, 74, 0.75);
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    position: relative;
    padding: 60px 20px 80px;
}
.aboutAd .box .tit {
    text-align: center; color: #fff; font-size: 34px;
    line-height: 1.4;
}
.aboutAd .box .desc {
    color: #fff; font-size: 16px; line-height: 1.6;
    text-align: center; margin-top: 24px;
}
@media (max-width: 768px) {
    .aboutAd { height: 280px; }
    .aboutAd .box { padding: 40px 16px 70px; }
}

.aboutTab {
    background: rgba(48, 50, 56, 0.55);
    position: absolute; left: 0; right: 0; bottom: 0; height: 56px;
}
.aboutTab .container {
    width: 900px; margin: 0 auto !important; height: 100%;
    display: flex; padding: 0 !important;
}
.aboutTab a {
    flex: 1; font-size: 17px; color: #fff;
    line-height: 56px; text-align: center;
    text-decoration: none; transition: background 0.3s;
}
.aboutTab a.on { background: #2a4ccc; }
.aboutTab a:not(.on):hover { background: rgba(42, 76, 204, 0.4); }

.aboutBg {
    background: url(/static/zhanpc/images/about/bg.jpg) center / cover no-repeat;
    overflow: hidden; padding: 30px 0;
}
.aboutBg .container { width: 1200px; margin: 0 auto !important; padding: 0 20px !important; }

.aboutTit {
    text-align: center; font-size: 30px; color: #313339; margin: 45px 0;
}

.content { font-size: 15px; color: #636777; line-height: 1.9; }
.content p { margin-bottom: 12px; text-indent: 2em; }

.qyList { overflow: hidden; }
.qyList ul { display: flex; gap: 16px; }
.qyList li {
    flex: 1; background: #fff; border-radius: 8px;
    padding: 20px 12px; text-align: center;
    box-shadow: 0 0 10px rgba(42, 76, 204, 0.15);
}
.qyList li .img {
    width: 56px; height: 56px; border-radius: 50%;
    background: #2a4ccc; display: flex;
    align-items: center; justify-content: center;
    margin: 0 auto 12px;
}
.qyList li .img img { width: 30px; height: 30px; object-fit: contain; }
.qyList li .title { font-size: 17px; color: #374567; margin-bottom: 6px; }
.qyList li .desc { font-size: 13px; color: #4d5884; line-height: 1.5; }

.cer { overflow: hidden; }
.cer ul { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.cer li { text-align: center; }
.cer li .img {
    border: 1px solid #e1e6f0; background: #fff; border-radius: 8px;
    padding: 20px; height: 220px; display: flex;
    align-items: center; justify-content: center; margin-bottom: 8px;
}
.cer li .img img { max-width: 80%; max-height: 160px; object-fit: contain; }
.cer li .title { font-size: 14px; color: #636777; }

@media (max-width: 768px) {
    .aboutAd { height: 280px; }
    .aboutAd .box .tit { font-size: 22px; }
    .aboutAd .box .desc { font-size: 13px; margin-top: 12px; }
    .aboutTab .container { width: 100% !important; }
    .aboutTab { height: 48px; }
    .aboutTab a { font-size: 14px; line-height: 48px; }
    .aboutBg .container { width: 100%; padding: 0 12px; }
    .aboutTit { font-size: 22px; margin: 28px 0; }
    .qyList ul { flex-wrap: wrap; }
    .qyList li { flex: none; width: calc(50% - 8px); padding: 16px 10px; }
    .qyList li .img { width: 44px; height: 44px; }
    .qyList li .img img { width: 24px; height: 24px; }
    .qyList li .title { font-size: 15px; }
    .qyList li .desc { font-size: 12px; }
    .cer ul { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .cer li .img { height: 160px; padding: 14px; }
}