*{margin:0;padding:0;box-sizing:border-box}
body{font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;color:#333;line-height:1.7;background:#f5f7f8;font-size:15px}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block;border:0}
ul{list-style:none}
.sf-wrap{max-width:1200px;margin:0 auto;padding:0 16px}
.sf-topbar{background:#0a4a56;color:#cfe3e8;font-size:13px;padding:8px 0}
.sf-topbar .sf-wrap{display:flex;justify-content:space-between;flex-wrap:wrap}
.sf-header{background:#fff;box-shadow:0 2px 8px rgba(0,0,0,.06);position:sticky;top:0;z-index:100}
.sf-header .sf-wrap{display:flex;align-items:center;justify-content:space-between;height:78px}
.sf-logo img{height:50px;width:auto}
.sf-nav>ul{display:flex;gap:8px}
.sf-nav>ul>li{position:relative}
.sf-nav>ul>li>a{display:block;padding:0 22px;line-height:78px;color:#223;font-size:16px;font-weight:500}
.sf-nav>ul>li>a:hover,.sf-nav>ul>li.sf-on>a{color:#0f5e6e}
.sf-nav>ul>li.sf-on{border-bottom:3px solid #0f5e6e}
.sf-burger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
.sf-burger span{width:26px;height:3px;background:#0f5e6e;display:block}
.sf-banner{position:relative;height:420px;overflow:hidden}
.sf-banner img{width:100%;height:100%;object-fit:cover}
.sf-banner-mask{position:absolute;inset:0;background:linear-gradient(90deg,rgba(10,74,86,.85),rgba(10,74,86,.35))}
.sf-banner-txt{position:absolute;left:0;right:0;top:50%;transform:translateY(-50%);color:#fff}
.sf-banner-txt h1{font-size:38px;margin-bottom:14px;font-weight:600;letter-spacing:1px}
.sf-banner-txt p{font-size:17px;opacity:.92;max-width:640px}
.sf-sec{padding:56px 0}
.sf-sec-t{text-align:center;margin-bottom:36px}
.sf-sec-t h2{font-size:30px;color:#1a2a33;font-weight:600;position:relative;display:inline-block;padding-bottom:14px}
.sf-sec-t h2:after{content:"";position:absolute;left:50%;bottom:0;transform:translateX(-50%);width:60px;height:3px;background:#0f5e6e}
.sf-sec-t p{color:#7a8a92;margin-top:10px;font-size:14px}
.sf-prod-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.sf-prod-card{background:#fff;border-radius:6px;overflow:hidden;box-shadow:0 2px 10px rgba(0,0,0,.06);transition:.3s}
.sf-prod-card:hover{transform:translateY(-4px);box-shadow:0 8px 22px rgba(15,94,110,.18)}
.sf-prod-card .sf-pic{height:210px;background:#eef2f3;overflow:hidden}
.sf-prod-card .sf-pic img{width:100%;height:100%;object-fit:cover}
.sf-prod-card .sf-info{padding:16px}
.sf-prod-card h3{font-size:16px;color:#1a2a33;margin-bottom:6px}
.sf-prod-card .sf-model{font-size:13px;color:#0f5e6e;margin-bottom:8px}
.sf-prod-card p{font-size:13px;color:#7a8a92;line-height:1.6}
.sf-feat{background:#0f5e6e;color:#fff}
.sf-feat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.sf-feat-item{text-align:center;padding:20px 10px}
.sf-feat-item .sf-num{font-size:34px;font-weight:700;color:#ffd27a}
.sf-feat-item .sf-lab{font-size:14px;opacity:.9;margin-top:6px}
.sf-apply{background:#fff}
.sf-apply-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.sf-apply-item{padding:22px;border-left:3px solid #0f5e6e;background:#f5f9fa}
.sf-apply-item h4{font-size:16px;color:#0f5e6e;margin-bottom:8px}
.sf-apply-item p{font-size:13px;color:#5a6a72}
.sf-news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.sf-news-card{background:#fff;border-radius:6px;overflow:hidden;box-shadow:0 2px 10px rgba(0,0,0,.06)}
.sf-news-card .sf-pic{height:180px;overflow:hidden}
.sf-news-card .sf-pic img{width:100%;height:100%;object-fit:cover;transition:.4s}
.sf-news-card:hover .sf-pic img{transform:scale(1.05)}
.sf-news-card .sf-info{padding:16px}
.sf-news-card .sf-date{font-size:12px;color:#9aa8af;margin-bottom:8px}
.sf-news-card h3{font-size:15px;line-height:1.5;margin-bottom:8px}
.sf-news-card h3 a{color:#1a2a33}
.sf-news-card h3 a:hover{color:#0f5e6e}
.sf-news-card p{font-size:13px;color:#7a8a92}
.sf-cta{background:linear-gradient(120deg,#0a4a56,#0f5e6e);color:#fff;text-align:center;padding:48px 16px}
.sf-cta h2{font-size:28px;margin-bottom:12px}
.sf-cta p{opacity:.9;margin-bottom:22px}
.sf-btn{display:inline-block;padding:12px 36px;background:#ffd27a;color:#0a4a56;border-radius:30px;font-weight:600;transition:.3s}
.sf-btn:hover{background:#fff}
.sf-footer{background:#083a45;color:#9fb8c0;padding:40px 0 0;font-size:13px}
.sf-foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.5fr;gap:30px;padding-bottom:30px}
.sf-foot-grid h4{color:#fff;font-size:15px;margin-bottom:14px}
.sf-foot-grid p,.sf-foot-grid li{line-height:2}
.sf-foot-bottom{border-top:1px solid rgba(255,255,255,.1);padding:16px 0;text-align:center;font-size:12px;color:#7a959e}
.sf-sub-banner{height:180px;background:linear-gradient(120deg,#0a4a56,#0f5e6e);color:#fff;display:flex;align-items:center}
.sf-sub-banner h1{font-size:30px;font-weight:600}
.sf-sub-banner .sf-crumb{font-size:13px;opacity:.85;margin-top:6px}
.sf-sub-banner .sf-crumb a{color:#ffd27a}
.sf-list{padding:40px 0}
.sf-p-detail{display:grid;grid-template-columns:1fr 1fr;gap:36px;background:#fff;padding:30px;border-radius:8px}
.sf-p-detail .sf-pic img{width:100%;border-radius:6px}
.sf-p-detail h2{font-size:24px;color:#1a2a33;margin-bottom:10px}
.sf-p-detail .sf-model{color:#0f5e6e;font-weight:600;margin-bottom:18px}
.sf-p-desc{color:#4a5a62;margin-bottom:20px}
.sf-param{width:100%;border-collapse:collapse;margin:10px 0 20px}
.sf-param td{border:1px solid #e0e6e8;padding:9px 12px;font-size:14px}
.sf-param td:first-child{background:#f0f5f6;color:#0f5e6e;width:38%;font-weight:500}
.sf-article{background:#fff;padding:36px;border-radius:8px}
.sf-article h2{font-size:24px;color:#1a2a33;margin-bottom:8px}
.sf-article .sf-meta{font-size:13px;color:#9aa8af;margin-bottom:20px;padding-bottom:16px;border-bottom:1px solid #eef2f3}
.sf-article .sf-cover{margin-bottom:22px;border-radius:6px;overflow:hidden}
.sf-article p{margin-bottom:14px;color:#3a4a52;text-indent:2em}
.sf-article h3{font-size:18px;color:#0f5e6e;margin:22px 0 10px}
.sf-art-list{background:#fff;border-radius:8px;padding:10px 24px}
.sf-art-list li{border-bottom:1px dashed #e0e6e8;padding:14px 0;display:flex;justify-content:space-between;align-items:center}
.sf-art-list li:last-child{border-bottom:0}
.sf-art-list .sf-date{color:#9aa8af;font-size:13px}
.sf-art-list h3{font-size:15px}
.sf-art-list h3 a:hover{color:#0f5e6e}
.sf-about-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:center}
.sf-about-grid img{border-radius:8px}
.sf-about-txt h2{font-size:24px;color:#1a2a33;margin-bottom:16px}
.sf-about-txt p{margin-bottom:12px;color:#4a5a62}
.sf-contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px}
.sf-contact-card{background:#fff;padding:28px;border-radius:8px}
.sf-contact-card h3{color:#0f5e6e;margin-bottom:14px;font-size:18px}
.sf-contact-card p{line-height:2.2;color:#4a5a62}
.sf-404{text-align:center;padding:90px 16px;background:#fff}
.sf-404 .sf-code{font-size:100px;font-weight:700;color:#0f5e6e;line-height:1}
.sf-404 h1{font-size:24px;margin:16px 0;color:#1a2a33}
.sf-404 p{color:#7a8a92;margin-bottom:24px}
@media(max-width:900px){
.sf-prod-grid,.sf-feat-grid{grid-template-columns:repeat(2,1fr)}
.sf-news-grid,.sf-apply-grid{grid-template-columns:repeat(2,1fr)}
.sf-foot-grid{grid-template-columns:1fr 1fr}
.sf-p-detail,.sf-about-grid,.sf-contact-grid{grid-template-columns:1fr}
.sf-banner{height:300px}
.sf-banner-txt h1{font-size:26px}
}
@media(max-width:640px){
.sf-nav{position:fixed;top:78px;left:0;right:0;background:#fff;max-height:0;overflow:hidden;transition:.3s;box-shadow:0 8px 16px rgba(0,0,0,.1)}
.sf-nav.sf-open{max-height:400px}
.sf-nav>ul{flex-direction:column;gap:0}
.sf-nav>ul>li>a{line-height:48px;padding:0 24px}
.sf-nav>ul>li.sf-on{border-bottom:0;border-left:3px solid #0f5e6e}
.sf-burger{display:flex}
.sf-prod-grid,.sf-news-grid,.sf-apply-grid,.sf-feat-grid{grid-template-columns:1fr}
.sf-foot-grid{grid-template-columns:1fr}
.sf-sec{padding:36px 0}
.sf-sec-t h2{font-size:24px}
}