*{
    margin:0;
    padding:0;
    box-sizing: border-box;
}
body{
    font-family: "Microsoft Yahei",system-ui,-apple-system, sans-serif;
    color:#333;
    line-height:1.7;
    background:#ffffff;
}
.container{
    width:1200px;
    margin:0 auto;
    max-width:95%;
}
.site-header{
    background:#ffffff;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    position:sticky;
    top:0;
    z-index:99;
}
.site-header .container{
    display:flex;
    justify-content: space-between;
    align-items:center;
    height:70px;
}
.logo{
    font-size:22px;
    font-weight:bold;
    color:#165DFF;
}
.main-nav a{
    text-decoration:none;
    color:#333;
    margin-left:32px;
    font-size:16px;
    transition: color 0.24s;
}
.main-nav a:hover{
    color:#165DFF;
}

/* Banner首屏 */
.banner{
    background: linear-gradient(135deg,#165DFF 0%,#4080ff 100%);
    color:#fff;
    padding:120px 0;
}
.banner-content{
    text-align:center;
}
.banner h1{
    font-size:44px;
    margin-bottom:12px;
}
.sub-title{
    font-size:20px;
    margin-bottom:16px;
    opacity:0.92;
}
.banner-desc{
    font-size:17px;
    max-width:650px;
    margin:0 auto 36px;
    opacity:0.88;
}
.btn-primary{
    display:inline-block;
    padding:13px 36px;
    background:#ffffff;
    color:#165DFF;
    text-decoration:none;
    border-radius:6px;
    font-weight:bold;
    font-size:16px;
    transition: all 0.25s;
}
.btn-primary:hover{
    background:#f0f6ff;
}

/* 通用区块 */
.section{
    padding:70px 0;
}
.section-title{
    text-align:center;
    font-size:30px;
    margin-bottom:42px;
    color:#222;
    position:relative;
}
.section-title::after{
    content:"";
    display:block;
    width:60px;
    height:3px;
    background:#165DFF;
    margin:12px auto 0;
}

.about-text p{
    margin-bottom:16px;
    font-size:16px;
    color:#444;
}

/* 服务卡片 */
.service-list{
    display:grid;
    grid-template-columns: repeat(4, 1fr);
    gap:24px;
}
.service-card{
    background:#f7f9fc;
    padding:28px 22px;
    border-radius:8px;
    transition:0.25s;
}
.service-card:hover{
    box-shadow: 0 6px 18px rgba(22, 93, 255,0.12);
}
.service-card h3{
    color:#165DFF;
    margin-bottom:12px;
    font-size:19px;
}

/* 优势 */
.advantage-list{
    display:grid;
    grid-template-columns: repeat(4,1fr);
    gap:24px;
}
.advantage-item{
    text-align:center;
    padding:24px 16px;
}
.advantage-item h4{
    font-size:18px;
    margin-bottom:10px;
    color:#222;
}

.contact-info{
    text-align:center;
    font-size:17px;
}
.contact-info p{
    margin-bottom:10px;
}

.site-footer{
    background:#222831;
    color:#ccc;
    text-align:center;
    padding:28px 0;
    font-size:15px;
}

/* 电脑端优先，简单兼容平板 */
@media (max-width:992px){
    .service-list,.advantage-list{
        grid-template-columns: repeat(2,1fr);
    }
    .banner h1{
        font-size:34px;
    }
}