*{margin:0;padding:0;box-sizing:border-box}
body{font-family:"Microsoft YaHei","PingFang SC",sans-serif;color:#333;background:#f5f7fa;line-height:1.7}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
ul,ol{list-style:none}

.vk-topbar{background:#1a3a5c;color:#fff;padding:8px 0;font-size:13px}
.vk-topbar-wrap{max-width:1200px;margin:0 auto;display:flex;justify-content:space-between;padding:0 15px}
.vk-topbar-phone{color:#ffd700;font-weight:bold}

.vk-header{background:#fff;box-shadow:0 2px 8px rgba(0,0,0,.08);position:sticky;top:0;z-index:100}
.vk-header-wrap{max-width:1200px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:12px 15px}
.vk-logo img{height:50px;width:auto}
.vk-nav ul{display:flex;gap:8px}
.vk-nav a{display:block;padding:10px 18px;font-size:15px;font-weight:500;color:#333;border-radius:4px;transition:all .3s}
.vk-nav a:hover,.vk-nav a.vk-active{color:#00a0b0;background:#f0f9fa}
.vk-menu-btn{display:none;font-size:24px;cursor:pointer;background:none;border:none;color:#333}

.vk-banner{position:relative;height:480px;overflow:hidden}
.vk-banner-slide{position:absolute;inset:0;opacity:0;transition:opacity 1s}
.vk-banner-slide.vk-active{opacity:1}
.vk-banner-slide img{width:100%;height:100%;object-fit:cover}
.vk-banner-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(26,58,92,.85),rgba(0,160,176,.6))}
.vk-banner-content{position:relative;max-width:1200px;margin:0 auto;height:100%;display:flex;flex-direction:column;justify-content:center;padding:0 15px;color:#fff;z-index:2}
.vk-banner-content h1{font-size:42px;margin-bottom:16px;letter-spacing:2px}
.vk-banner-content p{font-size:18px;margin-bottom:24px;opacity:.95}
.vk-banner-btn{display:inline-block;padding:12px 36px;background:#00a0b0;color:#fff;border-radius:4px;font-size:16px;transition:background .3s;width:fit-content}
.vk-banner-btn:hover{background:#008a98}

.vk-section{padding:60px 0}
.vk-section-title{text-align:center;margin-bottom:40px}
.vk-section-title h2{font-size:30px;color:#1a3a5c;display:inline-block;position:relative;padding-bottom:12px}
.vk-section-title h2::after{content:"";position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:60px;height:3px;background:#00a0b0}
.vk-section-title p{color:#888;margin-top:10px;font-size:14px}

.vk-wrap{max-width:1200px;margin:0 auto;padding:0 15px}

.vk-services{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.vk-service-card{background:#fff;border-radius:8px;padding:32px 20px;text-align:center;box-shadow:0 2px 12px rgba(0,0,0,.06);transition:transform .3s,box-shadow .3s}
.vk-service-card:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(0,160,176,.15)}
.vk-service-icon{width:64px;height:64px;margin:0 auto 16px;background:#e8f6f7;border-radius:50%;display:flex;align-items:center;justify-content:center}
.vk-service-icon svg{width:32px;height:32px;fill:#00a0b0}
.vk-service-card h3{font-size:18px;color:#1a3a5c;margin-bottom:10px}
.vk-service-card p{font-size:13px;color:#666}

.vk-products-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.vk-product-card{background:#fff;border-radius:8px;overflow:hidden;box-shadow:0 2px 12px rgba(0,0,0,.06);transition:transform .3s}
.vk-product-card:hover{transform:translateY(-4px)}
.vk-product-img{height:180px;overflow:hidden;background:#f0f0f0}
.vk-product-img img{width:100%;height:100%;object-fit:cover}
.vk-product-info{padding:16px}
.vk-product-info h3{font-size:15px;color:#1a3a5c;margin-bottom:8px;line-height:1.4}
.vk-product-info p{font-size:13px;color:#888;line-height:1.5}
.vk-product-link{display:inline-block;margin-top:10px;color:#00a0b0;font-size:13px}

.vk-advantages{background:#1a3a5c;color:#fff;padding:60px 0}
.vk-advantages-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.vk-adv-item h3{font-size:42px;color:#00d0d8;margin-bottom:8px}
.vk-adv-item p{font-size:14px;opacity:.9}

.vk-news-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.vk-news-col h3{font-size:20px;color:#1a3a5c;margin-bottom:20px;padding-bottom:10px;border-bottom:2px solid #00a0b0;display:flex;justify-content:space-between;align-items:center}
.vk-news-col h3 a{font-size:13px;color:#00a0b0;font-weight:normal}
.vk-news-item{display:flex;gap:16px;padding:14px 0;border-bottom:1px dashed #eee}
.vk-news-item-img{width:120px;height:80px;flex-shrink:0;overflow:hidden;border-radius:4px}
.vk-news-item-img img{width:100%;height:100%;object-fit:cover}
.vk-news-item-info h4{font-size:14px;line-height:1.4;margin-bottom:6}
.vk-news-item-info h4 a:hover{color:#00a0b0}
.vk-news-item-info p{font-size:12px;color:#999}

.vk-about{background:#fff}
.vk-about-flex{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.vk-about-text h3{font-size:24px;color:#1a3a5c;margin-bottom:16px}
.vk-about-text p{font-size:14px;color:#555;margin-bottom:12px;text-indent:2em}
.vk-about-img{border-radius:8px;overflow:hidden}

.vk-footer{background:#142a42;color:#bbb;padding:50px 0 20px;font-size:13px}
.vk-footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.5fr;gap:40px;margin-bottom:30px}
.vk-footer h4{color:#fff;font-size:16px;margin-bottom:16px}
.vk-footer li{margin-bottom:8px}
.vk-footer a:hover{color:#00d0d8}
.vk-footer-bottom{text-align:center;padding-top:20px;border-top:1px solid rgba(255,255,255,.1);font-size:12px;color:#888}

.vk-breadcrumb{background:#fff;padding:14px 0;font-size:13px;color:#888;border-bottom:1px solid #eee}
.vk-breadcrumb a{color:#00a0b0}
.vk-breadcrumb .vk-wrap{display:flex;align-items:center;gap:8px}

.vk-page-title{background:#1a3a5c;color:#fff;padding:40px 0;text-align:center}
.vk-page-title h1{font-size:32px;margin-bottom:8px}
.vk-page-title p{opacity:.8;font-size:14px}

.vk-content{padding:50px 0;background:#fff}
.vk-content-wrap{max-width:1000px;margin:0 auto;padding:0 15px}
.vk-content h2{font-size:22px;color:#1a3a5c;margin:24px 0 12px;padding-left:12px;border-left:4px solid #00a0b0}
.vk-content p{margin-bottom:14px;text-indent:2em;color:#444;font-size:15px;line-height:1.8}
.vk-content img{margin:20px auto;border-radius:8px}
.vk-content ul{margin:16px 0 16px 20px}
.vk-content ul li{list-style:disc;margin-bottom:8px;color:#444;font-size:14px}

.vk-detail-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px;margin-bottom:30px}
.vk-detail-img{border-radius:8px;overflow:hidden}
.vk-detail-spec table{width:100%;border-collapse:collapse;font-size:14px}
.vk-detail-spec td{padding:10px 12px;border:1px solid #eee}
.vk-detail-spec td:first-child{background:#f8fafc;color:#1a3a5c;font-weight:500;width:120px}

.vk-list-page{padding:50px 0}
.vk-list-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.vk-list-card{background:#fff;border-radius:8px;overflow:hidden;box-shadow:0 2px 8px rgba(0,0,0,.06)}
.vk-list-card-img{height:160px;overflow:hidden}
.vk-list-card-img img{width:100%;height:100%;object-fit:cover}
.vk-list-card-body{padding:16px}
.vk-list-card-body h3{font-size:15px;color:#1a3a5c;margin-bottom:8px}
.vk-list-card-body p{font-size:13px;color:#888;margin-bottom:10px}
.vk-list-card-body .vk-date{font-size:12px;color:#aaa}

.vk-contact-info{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin:30px 0}
.vk-contact-card{background:#fff;padding:30px;border-radius:8px;text-align:center;box-shadow:0 2px 8px rgba(0,0,0,.06)}
.vk-contact-card h3{color:#1a3a5c;font-size:18px;margin-bottom:12px}
.vk-contact-card p{color:#555;font-size:14px}

.vk-404{text-align:center;padding:100px 20px;background:#fff}
.vk-404 h1{font-size:120px;color:#00a0b0;line-height:1;margin-bottom:20px}
.vk-404 p{font-size:18px;color:#666;margin-bottom:30px}
.vk-404 a{display:inline-block;padding:12px 40px;background:#00a0b0;color:#fff;border-radius:4px}

@media(max-width:992px){
.vk-services{grid-template-columns:repeat(2,1fr)}
.vk-products-grid{grid-template-columns:repeat(2,1fr)}
.vk-advantages-grid{grid-template-columns:repeat(2,1fr)}
.vk-news-grid{grid-template-columns:1fr}
.vk-about-flex{grid-template-columns:1fr}
.vk-footer-grid{grid-template-columns:1fr 1fr}
.vk-list-grid{grid-template-columns:repeat(2,1fr)}
.vk-detail-grid{grid-template-columns:1fr}
.vk-contact-info{grid-template-columns:1fr}
.vk-banner-content h1{font-size:30px}
}
@media(max-width:600px){
.vk-nav{display:none;position:absolute;top:100%;left:0;right:0;background:#fff;box-shadow:0 4px 12px rgba(0,0,0,.1)}
.vk-nav.vk-open{display:block}
.vk-nav ul{flex-direction:column;padding:10px}
.vk-menu-btn{display:block}
.vk-banner{height:320px}
.vk-banner-content h1{font-size:24px}
.vk-banner-content p{font-size:14px}
.vk-services,.vk-products-grid,.vk-list-grid{grid-template-columns:1fr}
.vk-footer-grid{grid-template-columns:1fr}
.vk-topbar-wrap{flex-direction:column;gap:4px;text-align:center}
}