/* 全局重置 */
*{margin:0;padding:0;box-sizing:border-box;font-family:Arial,Helvetica,sans-serif;}
body{line-height:1.6;color:#333;background:#fff;}
a{text-decoration:none;color:inherit;}
ul{list-style:none;}
img{max-width:100%;height:auto;display:block;}
.container{width:92%;max-width:1200px;margin:0 auto;}
.text-center{text-align:center;}

/* 按钮样式 */
.btn-primary{display:inline-block;padding:12px 28px;background:#194b94;color:#fff;border-radius:4px;transition:0.3s;}
.btn-primary:hover{background:#103468;}
.btn-outline{display:inline-block;padding:11px 27px;border:2px solid #194b94;color:#194b94;border-radius:4px;transition:0.3s;}
.btn-outline:hover{background:#194b94;color:#fff;}

/* 头部导航 */
.site-header{background:#194b94;color:#fff;padding:16px 0;position:sticky;top:0;z-index:999;}
.site-header .container{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;}
.logo{font-size:22px;font-weight:bold;letter-spacing:1px;}
.main-nav{display:flex;gap:24px;flex-wrap:wrap;align-items:center;}
.main-nav a{padding:6px 0;position:relative;}
.main-nav a.active::after{content:"";position:absolute;left:0;bottom:0;width:100%;height:2px;background:#fff;}
.lang-switch{border:1px solid #fff;padding:5px 10px;border-radius:3px;}

/* 横幅banner */
.banner{position:relative;height:85vh;min-height:480px;display:flex;align-items:center;color:#fff;overflow:hidden;}
.banner-bg{position:absolute;top:0;left:0;width:100%;height:100%;z-index:-1;}
.banner-bg img{width:100%;height:100%;object-fit:cover;}
.banner-bg::after{content:"";position:absolute;width:100%;height:100%;background:rgba(0,0,0,0.55);}
.banner-content{position:relative;z-index:1;max-width:600px;padding-left:4%;}
.banner-content h1{font-size:42px;margin-bottom:16px;line-height:1.2;}
.banner-content p{font-size:18px;margin-bottom:28px;}

/* 内页横幅 */
.page-banner{background:#194b94;color:#fff;padding:60px 0;text-align:center;}
.page-banner h1{font-size:34px;margin-bottom:10px;}

/* 通用区块 */
.section{padding:70px 0;}
.section-title{text-align:center;font-size:30px;margin-bottom:48px;color:#222;}

/* 优势板块 */
.advantage-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:30px;}
.advantage-item{padding:28px;border:1px solid #eee;border-radius:6px;text-align:center;transition:0.3s;}
.advantage-item:hover{box-shadow:0 6px 18px #00000012;}
.advantage-item h3{margin-bottom:12px;color:#194b94;}

/* 产品网格 */
.product-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:32px;}
.product-card{border:1px solid #eee;border-radius:6px;overflow:hidden;transition:0.3s;}
.product-card:hover{box-shadow:0 8px 22px #00000015;}
.product-card img{height:210px;object-fit:cover;width:100%;}
.product-card h3{padding:16px 16px 8px;font-size:18px;}
.product-card p{padding:0 16px 16px;color:#555;font-size:15px;}
.product-card .btn-outline{margin:0 16px 20px;}

/* 关于我们页面 */
.about-content{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;}
.about-text h2{margin-bottom:20px;color:#194b94;}
.about-text p{margin-bottom:14px;color:#444;}
.about-img img{border-radius:6px;}

/* 联系页面 */
.contact-row{display:grid;grid-template-columns:1fr 1fr;gap:40px;}
.contact-item{margin-bottom:22px;}
.contact-item h4{color:#194b94;margin-bottom:6px;}
.form-group{margin-bottom:16px;}
.form-group input,.form-group textarea{width:100%;padding:12px;border:1px solid #ddd;border-radius:4px;font-size:15px;}
.form-group textarea{resize:none;}

/* 咨询色块 */
.contact-block{background:#f5f7fa;text-align:center;}
.contact-block h2{font-size:28px;margin-bottom:12px;}
.contact-block p{margin-bottom:24px;font-size:17px;color:#444;}

/* 页脚 */
.site-footer{background:#111;color:#ccc;padding:50px 0 20px;}
.site-footer .container{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:32px;margin-bottom:36px;}
.footer-col h4{color:#fff;margin-bottom:16px;font-size:17px;}
.footer-col li{margin-bottom:8px;}
.footer-col a:hover{color:#5390e0;}
.copyright{text-align:center;padding-top:20px;border-top:1px solid #222;color:#888;font-size:14px;}

/* 移动端适配 */
@media(max-width:768px){
    .banner-content h1{font-size:30px;}
    .about-content,.contact-row{grid-template-columns:1fr;}
    .main-nav{gap:14px;}
    .section{padding:45px 0;}
}