*{margin:0;padding:0;box-sizing:border-box}
body{font-family:"Microsoft YaHei","PingFang SC",sans-serif;color:#333;line-height:1.7;background:#f5f7fa}
.rk-wrap{width:1200px;margin:0 auto;max-width:95%}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
ul{list-style:none}

/* header */
.rk-topbar{background:#1a3a6b;color:#fff;padding:8px 0;font-size:13px}
.rk-topbar .rk-wrap{display:flex;justify-content:space-between;align-items:center}
.rk-topbar a{color:#cde0ff}
.rk-header{background:#fff;box-shadow:0 2px 8px rgba(0,0,0,.08);position:sticky;top:0;z-index:100}
.rk-header .rk-wrap{display:flex;align-items:center;justify-content:space-between;padding:15px 0}
.rk-logo img{height:55px;width:auto}
.rk-nav ul{display:flex;gap:35px}
.rk-nav a{font-size:16px;font-weight:600;color:#333;transition:color .2s;padding:8px 0}
.rk-nav a:hover,.rk-nav a.rk-active{color:#1a4b8c}
.rk-phone{background:linear-gradient(135deg,#e63946,#d62828);color:#fff;padding:10px 22px;border-radius:6px;font-size:18px;font-weight:700}

/* banner */
.rk-banner{position:relative;overflow:hidden;height:420px}
.rk-banner img{width:100%;height:100%;object-fit:cover}
.rk-banner-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(20,50,100,.85),rgba(30,80,150,.65));display:flex;align-items:center}
.rk-banner-text{padding-left:60px;color:#fff}
.rk-banner-text h1,.rk-banner-text h2{font-size:42px;margin-bottom:15px;line-height:1.3;font-weight:700}
.rk-banner-text p{font-size:18px;opacity:.9;margin-bottom:25px}
.rk-banner-btn{display:inline-block;background:#e63946;color:#fff;padding:12px 35px;border-radius:4px;font-size:16px;font-weight:600}

/* section common */
.rk-section{padding:60px 0}
.rk-section-title{text-align:center;margin-bottom:45px}
.rk-section-title h2{font-size:32px;color:#1a3a6b;margin-bottom:10px}
.rk-section-title span{width:60px;height:3px;background:#e63946;display:inline-block}

/* product grid */
.rk-prod-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:25px}
.rk-prod-card{background:#fff;border-radius:8px;overflow:hidden;box-shadow:0 2px 12px rgba(0,0,0,.06);transition:transform .3s,box-shadow .3s}
.rk-prod-card:hover{transform:translateY(-5px);box-shadow:0 8px 25px rgba(0,0,0,.12)}
.rk-prod-card img{height:220px;width:100%;object-fit:cover}
.rk-prod-info{padding:20px}
.rk-prod-info h3{font-size:20px;color:#1a3a6b;margin-bottom:8px}
.rk-prod-info p{font-size:14px;color:#666;margin-bottom:15px}
.rk-prod-info a{color:#e63946;font-weight:600;font-size:14px}

/* news list */
.rk-news-list{display:grid;grid-template-columns:1fr;gap:20px}
.rk-news-item{display:flex;gap:20px;background:#fff;border-radius:8px;padding:15px;box-shadow:0 1px 6px rgba(0,0,0,.05)}
.rk-news-item img{width:220px;height:140px;object-fit:cover;border-radius:6px;flex-shrink:0}
.rk-news-body h3{font-size:18px;color:#222;margin-bottom:8px}
.rk-news-body p{font-size:14px;color:#777}
.rk-news-date{font-size:12px;color:#aaa;margin-top:8px}

/* about */
.rk-about-box{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.rk-about-box img{border-radius:8px}
.rk-about-box h3{font-size:24px;color:#1a3a6b;margin-bottom:15px}
.rk-about-box p{font-size:15px;color:#555;margin-bottom:12px;text-indent:2em}

/* feature icons */
.rk-features{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.rk-feature{text-align:center;padding:25px 15px;background:#fff;border-radius:8px}
.rk-feature .rk-num{font-size:36px;font-weight:800;color:#e63946;margin-bottom:8px}
.rk-feature p{font-size:14px;color:#666}

/* breadcrumb */
.rk-crumb{background:#eef2f7;padding:12px 0;font-size:13px;color:#888}
.rk-crumb a{color:#1a4b8c}

/* page banner */
.rk-pagebanner{height:180px;background:linear-gradient(135deg,#1a3a6b,#2a5aa0);display:flex;align-items:center;justify-content:center;color:#fff}
.rk-pagebanner h1{font-size:36px}

/* product detail */
.rk-prod-detail{display:grid;grid-template-columns:1fr 1fr;gap:40px;margin-bottom:40px}
.rk-prod-detail img{border-radius:8px;box-shadow:0 2px 12px rgba(0,0,0,.1)}
.rk-prod-info h2{font-size:28px;color:#1a3a6b;margin-bottom:15px}
.rk-prod-info .rk-desc{color:#555;margin-bottom:20px}
.rk-param-table{width:100%;border-collapse:collapse;margin-bottom:20px}
.rk-param-table td{padding:10px 12px;border:1px solid #e0e0e0;font-size:14px}
.rk-param-table td:first-child{background:#f5f8fc;font-weight:600;width:120px;color:#1a3a6b}
.rk-scene-box{background:#f8f9fb;padding:18px;border-radius:6px;margin-bottom:20px}
.rk-scene-box h4{color:#1a3a6b;margin-bottom:8px}
.rk-detail-text p{text-indent:2em;margin-bottom:12px;color:#444}

/* news detail */
.rk-news-detail{background:#fff;border-radius:8px;padding:40px;max-width:900px;margin:0 auto}
.rk-news-detail h1{font-size:28px;color:#222;margin-bottom:12px;line-height:1.4}
.rk-news-meta{font-size:13px;color:#aaa;margin-bottom:25px;padding-bottom:15px;border-bottom:1px solid #eee}
.rk-news-detail img{width:100%;border-radius:6px;margin-bottom:25px}
.rk-news-detail .rk-content p{text-indent:2em;margin-bottom:15px;font-size:15px;color:#444;line-height:1.9}

/* contact */
.rk-contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.rk-contact-info{background:#fff;padding:30px;border-radius:8px}
.rk-contact-info h3{color:#1a3a6b;margin-bottom:15px}
.rk-contact-info p{margin-bottom:10px;color:#555}

/* 404 */
.rk-404{text-align:center;padding:80px 20px}
.rk-404 .rk-code{font-size:120px;font-weight:900;color:#1a3a6b;line-height:1}
.rk-404 p{font-size:20px;color:#666;margin:20px 0 30px}
.rk-404 a{display:inline-block;background:#e63946;color:#fff;padding:12px 40px;border-radius:4px}

/* footer */
.rk-footer{background:#1a2a4a;color:#aab;font-size:14px;padding:40px 0 20px;margin-top:60px}
.rk-footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:40px;margin-bottom:30px}
.rk-footer h4{color:#fff;margin-bottom:15px;font-size:16px}
.rk-footer p{margin-bottom:8px;line-height:1.8}
.rk-footer-bottom{text-align:center;padding-top:20px;border-top:1px solid #2a3a5a;font-size:12px}

/* responsive */
@media(max-width:768px){
  .rk-wrap{width:100%;padding:0 15px}
  .rk-nav ul{display:none}
  .rk-banner{height:260px}
  .rk-banner-text{padding-left:20px}
  .rk-banner-text h1,.rk-banner-text h2{font-size:24px}
  .rk-prod-grid{grid-template-columns:1fr}
  .rk-features{grid-template-columns:repeat(2,1fr)}
  .rk-about-box,.rk-prod-detail,.rk-contact-grid{grid-template-columns:1fr}
  .rk-news-item{flex-direction:column}
  .rk-news-item img{width:100%;height:180px}
  .rk-footer-grid{grid-template-columns:1fr}
  .rk-pagebanner h1{font-size:24px}
  .rk-section{padding:35px 0}
  .rk-section-title h2{font-size:24px}
}