:root{--c1:#2563eb;--c2:#1d4ed8;--c3:#334155;--c4:#0f172a;--c5:#64748b;--c6:#1e293b;--c7:#f8fafc;--c8:#e2e8f0;--c9:#fff;}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:"Segoe UI","Microsoft YaHei",sans-serif;color:var(--c4);line-height:1.7;background:#fff;font-size:16px}
a{color:var(--c1);text-decoration:none}
a:hover{color:var(--c2)}
img{max-width:100%;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
/* Header */
.site-header{position:sticky;top:0;z-index:100;background:#fff;box-shadow:0 1px 4px rgba(0,0,0,.08)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:80px}
.site-title{font-size:22px;font-weight:700;color:var(--c4)}
.site-title a{color:inherit}
.main-nav ul{list-style:none;display:flex;gap:8px;flex-wrap:wrap}
.main-nav li{position:relative}
.main-nav a{display:block;padding:10px 14px;color:var(--c3);font-size:15px}
.main-nav a:hover{color:var(--c1)}
.main-nav .sub-menu{display:none;position:absolute;left:0;top:100%;background:#fff;min-width:180px;box-shadow:0 2px 8px rgba(0,0,0,.12);flex-direction:column}
.main-nav li:hover .sub-menu{display:flex}
.main-nav .sub-menu a{padding:8px 14px;font-size:14px}
/* Hero */
.hero{position:relative;height:380px;background:linear-gradient(135deg,#1e293b,#2563eb);color:#fff;display:flex;align-items:center;justify-content:center;text-align:center}
.hero h2{font-size:36px;font-weight:700;margin-bottom:14px}
.hero p{font-size:18px;opacity:.92;max-width:780px}
/* Sections */
section{padding:64px 0}
.section-dark{background:var(--c6);color:#fff}
.section-light{background:var(--c7)}
.section-head{text-align:center;margin-bottom:40px}
.section-head .eyebrow{color:var(--c5);font-size:12px;letter-spacing:3px;text-transform:uppercase;margin-bottom:8px}
.section-head h2{font-size:30px;font-weight:700}
.section-dark .section-head h2{color:#fff}
.section-dark .section-head .eyebrow{color:#9ca3af}
/* Product grid */
.product-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.product-card{background:#fff;border-radius:8px;overflow:hidden;box-shadow:0 1px 4px rgba(0,0,0,.08);transition:transform .2s,box-shadow .2s}
.product-card:hover{transform:translateY(-4px);box-shadow:0 8px 20px rgba(0,0,0,.12)}
.product-card .img-wrap{aspect-ratio:4/3;overflow:hidden;background:var(--c8)}
.product-card img{width:100%;height:100%;object-fit:cover}
.product-card h4{padding:14px 16px;font-size:16px;font-weight:600}
.product-card h4 a{color:var(--c4)}
.btn-wrap{text-align:center;margin-top:36px}
.btn{display:inline-block;padding:10px 28px;background:var(--c1);color:#fff;border-radius:4px;font-size:15px}
.btn:hover{background:var(--c2);color:#fff}
/* Case grid */
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.case-card{position:relative;border-radius:8px;overflow:hidden;min-height:320px;background:var(--c6)}
.case-card .bg{position:absolute;inset:0;background-size:cover;background-position:center}
.case-card .overlay{position:absolute;inset:0;background:rgba(30,41,59,.78)}
.case-card .body{position:relative;z-index:2;padding:28px;color:#fff;height:100%;display:flex;flex-direction:column;justify-content:flex-end;min-height:320px}
.case-card h4{font-size:18px;font-weight:600;margin-bottom:10px;line-height:1.4}
.case-card .meta{font-size:13px;opacity:.85}
.case-card .desc{font-size:14px;opacity:.9;margin-top:8px;line-height:1.6}
/* About */
.about-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:40px;align-items:center}
.about-image{border-radius:8px;overflow:hidden;min-height:320px}
.about-features{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.about-feature{display:flex;align-items:center;gap:10px;font-size:15px}
.about-feature .tick{width:24px;height:24px;flex-shrink:0;color:#d65050}
/* News */
.news-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:32px}
.news-head h2{font-size:30px;font-weight:700}
.news-list{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.news-item{background:#fff;border-radius:8px;padding:24px;box-shadow:0 1px 4px rgba(0,0,0,.06);display:flex;flex-direction:column}
.news-item .tag{font-size:12px;color:var(--c5);margin-bottom:8px}
.news-item h4{font-size:18px;font-weight:600;margin-bottom:10px;line-height:1.5}
.news-item .excerpt{font-size:14px;color:var(--c5);line-height:1.7;flex:1}
.news-item .date{font-size:13px;color:var(--c5);margin-top:12px}
/* Contact */
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.contact-card{background:var(--c9);border-radius:8px;padding:32px;text-align:center;box-shadow:0 1px 4px rgba(0,0,0,.06)}
.contact-card .icon{width:40px;height:40px;margin:0 auto 12px;color:var(--c1)}
.contact-card h4{font-size:18px;margin-bottom:6px}
.contact-card p{font-size:15px;color:var(--c3)}
.contact-card .time{font-size:13px;color:var(--c5);margin-top:4px}
/* Footer */
.site-footer{background:var(--c6);color:#9ca3af;padding:32px 0;text-align:center;font-size:14px}
.site-footer a{color:#9ca3af}
/* Region Index (全国服务区域) */
.region-index .area-block{background:#fff;border-radius:8px;padding:28px;margin-bottom:24px;box-shadow:0 1px 4px rgba(0,0,0,.06)}
.region-index .area-title{font-size:20px;font-weight:700;color:var(--c1);margin-bottom:18px;padding-bottom:12px;border-bottom:2px solid var(--c8);display:flex;align-items:center;gap:10px}
.region-index .area-title .area-bar{width:4px;height:22px;background:var(--c1);border-radius:2px}
.region-index .province-row{margin-bottom:14px;line-height:2}
.region-index .province-row:last-child{margin-bottom:0}
.region-index .province-name{font-weight:700;font-size:16px;color:var(--c4);margin-right:12px}
.region-index .province-name a{color:var(--c4)}
.region-index .province-name a:hover{color:var(--c1)}
.region-index .city-link{display:inline-block;font-size:14px;color:var(--c5);margin-right:14px;transition:color .15s}
.region-index .city-link:hover{color:var(--c1)}
/* Responsive */
@media (max-width:900px){
 .product-grid,.case-grid,.contact-grid{grid-template-columns:repeat(2,1fr)}
 .about-grid{grid-template-columns:1fr}
 .news-list{grid-template-columns:1fr}
 .hero h2{font-size:26px}
 .main-nav ul{gap:2px}
 .main-nav a{padding:8px 6px;font-size:14px}
}
@media (max-width:600px){
 .product-grid,.case-grid,.contact-grid{grid-template-columns:1fr}
 .header-inner{height:auto;flex-direction:column;padding:12px 0}
 .main-nav ul{justify-content:center}
}