*{margin:0;padding:0;box-sizing:border-box;font-family:"Microsoft Yahei",sans-serif;}
:root{--main:#0F4C81;--dark:#1A2430;--gray:#f4f7fa;--orange:#ff7800;}
a{text-decoration:none;color:inherit;}
ul{list-style:none;}
.container{width:90%;max-width:1200px;margin:0 auto;}

/* 顶部导航 */
header{background:#fff;box-shadow:0 2px 8px #00000015;position:sticky;top:0;z-index:999;}
.nav-wrap{display:flex;justify-content:space-between;align-items:center;padding:14px 0;}
.logo{font-size:22px;font-weight:bold;color:var(--main);}
.nav-menu{display:flex;gap:28px;}
.nav-menu li a{color:#333;font-size:15px;transition:0.3s;}
.nav-menu li a:hover{color:var(--main);}
.btn-tel{background:var(--main);color:#fff;padding:9px 18px;border-radius:4px;font-weight:bold;}

/* Banner首屏轮播 */
.banner{height:520px;background:linear-gradient(rgba(15,76,129,0.75),rgba(15,76,129,0.75)),url("images/banner1.jpg");background-size:cover;background-position:center;display:flex;align-items:center;color:#fff;}
.banner-text h1{font-size:44px;margin-bottom:16px;line-height:1.3;}
.banner-text p{font-size:18px;margin-bottom:30px;opacity:0.95;max-width:650px;}
.banner-buttons{display:flex;gap:16px;}
.btn-primary{background:var(--orange);color:#fff;padding:12px 26px;border-radius:4px;font-size:16px;}
.btn-outline{border:1px solid #fff;color:#fff;padding:12px 26px;border-radius:4px;font-size:16px;}

/* 通用板块 */
.section{padding:70px 0;}
.section-title{text-align:center;margin-bottom:50px;}
.section-title h2{font-size:32px;color:#222;margin-bottom:10px;}
.section-title p{color:#666;max-width:700px;margin:0 auto;}

/* 产品卡片 */
.product-list{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}
.product-card{background:#fff;box-shadow:0 3px 12px #00000010;border-radius:8px;overflow:hidden;transition:0.3s;}
.product-card:hover{transform:translateY(-6px);box-shadow:0 6px 20px #00000018;}
.product-img{height:220px;background:#eee;}
.product-img img{width:100%;height:100%;object-fit:cover;}
.product-body{padding:20px;}
.product-body h3{font-size:18px;color:#222;margin-bottom:10px;}
.product-body p{color:#666;font-size:14px;line-height:1.6;margin-bottom:16px;}
.product-body a{color:var(--main);font-weight:bold;}

/* 产品详情页布局 */
.product-detail-wrap{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:flex-start;}
.product-detail-img img{width:100%;border-radius:8px;box-shadow:0 4px 16px rgba(0,0,0,0.1);}
.spec-table{width:100%;border-collapse:collapse;margin:24px 0;}
.spec-table td, .spec-table th{border:1px solid #ddd;padding:12px;}
.spec-table th{background:var(--gray);text-align:left;width:30%;}

/* 解决方案 */
.solution-wrap{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;}
.solution-item{background:var(--gray);padding:30px;border-radius:8px;}
.solution-item h3{font-size:20px;color:var(--main);margin-bottom:14px;}
.solution-item p{color:#555;line-height:1.7;}

/* 优势 */
.advantage-wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}
.advantage-item{text-align:center;padding:20px;}
.advantage-item h3{margin:14px 0 8px;color:#222;}
.advantage-item p{color:#666;line-height:1.6;}

/* 表单区域 */
.form-wrap{background:var(--gray);padding:40px;border-radius:10px;}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:20px;}
.form-full{grid-column:1/-1;}
input,select,textarea{width:100%;padding:12px;border:1px solid #ddd;border-radius:4px;font-size:15px;}
textarea{min-height:140px;resize:vertical;}
.submit-btn{background:var(--main);color:#fff;border:none;padding:14px 30px;font-size:16px;border-radius:4px;cursor:pointer;width:100%;}

/* 页脚 */
footer{background:var(--dark);color:#ccc;padding:50px 0 20px;}
.foot-wrap{display:grid;grid-template-columns:repeat(3,1fr);gap:30px;margin-bottom:40px;}
.foot-item h4{color:#fff;font-size:18px;margin-bottom:20px;}
.foot-item p{line-height:1.8;margin-bottom:8px;}
.foot-item a{color:#ccc;}
.copyright{text-align:center;padding-top:20px;border-top:#333 solid 1px;font-size:14px;}

/* 移动端适配 */
@media(max-width:992px){
.nav-menu{display:none;}
.product-list{grid-template-columns:repeat(2,1fr);}
.advantage-wrap{grid-template-columns:repeat(2,1fr);}
.solution-wrap{grid-template-columns:1fr;}
.form-row{grid-template-columns:1fr;}
.banner{height:420px;}
.banner-text h1{font-size:32px;}
.product-detail-wrap{grid-template-columns:1fr;}
}
@media(max-width:576px){
.product-list{grid-template-columns:1fr;}
.advantage-wrap{grid-template-columns:1fr;}
}


.banner {
    /* 保留你原来这里所有旧样式，只追加下面两行 */
    background-image: url("../images/bannertop.jpg");
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
}