/* 盛鼎宏鑫 - 企业IT技术服务 */
*{margin:0;padding:0;box-sizing:border-box}
:root{
  --sd-primary:#1a3a6c;
  --sd-accent:#0d9488;
  --sd-dark:#0f2545;
  --sd-light:#f4f7fb;
  --sd-text:#333;
  --sd-gray:#666;
  --sd-border:#e2e8f0;
}
html{scroll-behavior:smooth}
body{font-family:"Microsoft YaHei","PingFang SC",-apple-system,sans-serif;color:var(--sd-text);line-height:1.7;background:#fff;font-size:15px}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* header */
.sd-header{position:sticky;top:0;z-index:1000;background:#fff;box-shadow:0 2px 12px rgba(0,0,0,.06)}
.sd-header-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.sd-logo{display:flex;align-items:center;gap:10px}
.sd-logo img{height:44px;width:auto}
.sd-nav{display:flex;gap:32px}
.sd-nav a{font-size:15px;color:#333;font-weight:500;transition:color .2s}
.sd-nav a:hover,.sd-nav a.active{color:var(--sd-accent)}
.sd-menu-btn{display:none;background:none;border:none;cursor:pointer;width:28px;height:22px;position:relative}
.sd-menu-btn span{position:absolute;left:0;width:100%;height:2px;background:var(--sd-primary);transition:.3s}
.sd-menu-btn span:nth-child(1){top:0}
.sd-menu-btn span:nth-child(2){top:10px}
.sd-menu-btn span:nth-child(3){top:20px}

/* banner */
.sd-banner{position:relative;height:520px;overflow:hidden;background:var(--sd-dark)}
.sd-banner img{width:100%;height:100%;object-fit:cover;opacity:.55}
.sd-banner-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(15,37,69,.85),rgba(13,148,136,.6))}
.sd-banner-content{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;color:#fff;padding:0 20px}
.sd-banner-content h1{font-size:42px;margin-bottom:16px;font-weight:700;letter-spacing:2px}
.sd-banner-content p{font-size:18px;max-width:680px;margin-bottom:28px;opacity:.92}
.sd-btn{display:inline-block;padding:12px 36px;border-radius:4px;font-size:15px;transition:.3s;cursor:pointer;border:none}
.sd-btn-primary{background:var(--sd-accent);color:#fff}
.sd-btn-primary:hover{background:#0f766e}
.sd-btn-outline{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.6)}
.sd-btn-outline:hover{background:rgba(255,255,255,.12)}

/* sections */
.sd-section{padding:80px 0}
.sd-section.alt{background:var(--sd-light)}
.sd-sec-head{text-align:center;margin-bottom:48px}
.sd-sec-head h2{font-size:32px;color:var(--sd-primary);margin-bottom:12px;font-weight:700}
.sd-sec-head p{color:var(--sd-gray);font-size:16px}
.sd-sec-line{width:60px;height:3px;background:var(--sd-accent);margin:16px auto 0}

/* services grid */
.sd-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.sd-card{background:#fff;border-radius:8px;overflow:hidden;box-shadow:0 2px 16px rgba(0,0,0,.06);transition:.3s;border:1px solid var(--sd-border)}
.sd-card:hover{transform:translateY(-4px);box-shadow:0 8px 28px rgba(0,0,0,.12)}
.sd-card-img{height:200px;overflow:hidden}
.sd-card-img img{width:100%;height:100%;object-fit:cover}
.sd-card-body{padding:24px}
.sd-card-body h3{font-size:19px;color:var(--sd-primary);margin-bottom:10px}
.sd-card-body p{color:var(--sd-gray);font-size:14px;line-height:1.7}

/* why choose */
.sd-why{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.sd-why-item{text-align:center;padding:32px 16px;background:#fff;border-radius:8px;border:1px solid var(--sd-border)}
.sd-why-icon{width:56px;height:56px;border-radius:50%;background:var(--sd-light);display:flex;align-items:center;justify-content:center;margin:0 auto 16px;font-size:24px;color:var(--sd-accent);font-weight:700}
.sd-why-item h4{font-size:17px;color:var(--sd-primary);margin-bottom:8px}
.sd-why-item p{font-size:13px;color:var(--sd-gray)}

/* stats */
.sd-stats{background:var(--sd-primary);color:#fff;padding:56px 0}
.sd-stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.sd-stat-num{font-size:40px;font-weight:700;color:var(--sd-accent)}
.sd-stat-label{font-size:14px;opacity:.85;margin-top:4px}

/* news list */
.sd-news-list{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.sd-news-card{background:#fff;border-radius:8px;overflow:hidden;box-shadow:0 2px 12px rgba(0,0,0,.06);transition:.3s}
.sd-news-card:hover{transform:translateY(-3px)}
.sd-news-card .sd-card-img{height:180px}
.sd-news-date{font-size:12px;color:var(--sd-accent);margin-bottom:8px}
.sd-news-card h3{font-size:16px;color:var(--sd-primary);margin-bottom:8px;line-height:1.5}
.sd-news-card p{font-size:13px;color:var(--sd-gray);line-height:1.6}

/* breadcrumb */
.sd-crumb{background:var(--sd-light);padding:14px 0;font-size:13px;color:var(--sd-gray)}
.sd-crumb a{color:var(--sd-accent)}

/* page banner */
.sd-page-banner{height:200px;background:var(--sd-primary);display:flex;align-items:center;justify-content:center;color:#fff}
.sd-page-banner h1{font-size:30px;font-weight:700}

/* news detail */
.sd-article{max-width:820px;margin:0 auto;padding:40px 20px}
.sd-article h1{font-size:28px;color:var(--sd-primary);margin-bottom:16px;line-height:1.4}
.sd-article-meta{font-size:13px;color:var(--sd-gray);margin-bottom:24px;padding-bottom:16px;border-bottom:1px solid var(--sd-border)}
.sd-article-img{margin:24px 0;border-radius:8px;overflow:hidden}
.sd-article p{margin-bottom:16px;line-height:1.9;color:#444}
.sd-article h3{font-size:20px;color:var(--sd-primary);margin:28px 0 14px}

/* product detail */
.sd-pd{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.sd-pd-img{border-radius:8px;overflow:hidden;border:1px solid var(--sd-border)}
.sd-pd-info h1{font-size:28px;color:var(--sd-primary);margin-bottom:16px}
.sd-pd-desc{color:var(--sd-gray);margin-bottom:24px;line-height:1.8}
.sd-pd-spec{background:var(--sd-light);padding:20px;border-radius:8px;margin-bottom:24px}
.sd-pd-spec h4{font-size:15px;color:var(--sd-primary);margin-bottom:12px}
.sd-pd-spec table{width:100%;font-size:14px}
.sd-pd-spec td{padding:8px 0;border-bottom:1px dashed var(--sd-border)}
.sd-pd-spec td:first-child{color:var(--sd-gray);width:120px}

/* contact */
.sd-contact{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.sd-contact-info h3{font-size:20px;color:var(--sd-primary);margin-bottom:20px}
.sd-contact-info p{margin-bottom:14px;color:var(--sd-gray)}
.sd-form input,.sd-form textarea{width:100%;padding:12px 14px;border:1px solid var(--sd-border);border-radius:4px;font-size:14px;margin-bottom:14px;font-family:inherit}
.sd-form textarea{height:120px;resize:vertical}

/* footer */
.sd-footer{background:var(--sd-dark);color:#aaa;padding:56px 0 24px;font-size:14px}
.sd-footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:32px}
.sd-footer h4{color:#fff;font-size:16px;margin-bottom:16px}
.sd-footer p{line-height:1.8}
.sd-footer ul{list-style:none}
.sd-footer li{margin-bottom:8px}
.sd-footer a{color:#aaa;transition:color .2s}
.sd-footer a:hover{color:var(--sd-accent)}
.sd-copy{text-align:center;padding-top:24px;border-top:1px solid rgba(255,255,255,.1);font-size:13px;color:#888}

/* 404 */
.sd-404{text-align:center;padding:100px 20px}
.sd-404 h1{font-size:100px;color:var(--sd-accent);line-height:1}
.sd-404 h2{font-size:24px;color:var(--sd-primary);margin:16px 0}
.sd-404 p{color:var(--sd-gray);margin-bottom:28px}

/* responsive */
@media(max-width:900px){
  .sd-nav{display:none;position:absolute;top:72px;left:0;right:0;background:#fff;flex-direction:column;padding:20px;box-shadow:0 8px 16px rgba(0,0,0,.1);gap:16px}
  .sd-nav.open{display:flex}
  .sd-menu-btn{display:block}
  .sd-grid,.sd-news-list{grid-template-columns:1fr 1fr}
  .sd-why{grid-template-columns:1fr 1fr}
  .sd-stats-grid{grid-template-columns:1fr 1fr}
  .sd-footer-grid{grid-template-columns:1fr 1fr}
  .sd-pd,.sd-contact{grid-template-columns:1fr}
  .sd-banner{height:400px}
  .sd-banner-content h1{font-size:28px}
  .sd-banner-content p{font-size:15px}
}
@media(max-width:600px){
  .sd-grid,.sd-news-list,.sd-why,.sd-stats-grid,.sd-footer-grid{grid-template-columns:1fr}
  .sd-section{padding:56px 0}
  .sd-sec-head h2{font-size:24px}
}