:root{
  --c-primary:#0e5aa7; --c-primary-d:#0a417a; --c-teal:#0a8f8f;
  --c-ink:#1a2430; --c-gray:#5b6b7a; --c-line:#e3e9ef; --c-bg:#f5f8fb;
  --r-md:12px; --r-lg:18px;
  --sh-sm:0 2px 8px rgba(14,42,74,.08); --sh-md:0 8px 28px rgba(14,42,74,.12);
  --wrap:1200px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei","Segoe UI",Arial,sans-serif;color:var(--c-ink);background:#fff;line-height:1.75}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.skip{position:absolute;left:-9999px}
.skip:focus{left:8px;top:8px;background:#fff;padding:8px 14px;z-index:999;border-radius:6px}

/* ===== 顶部信息条 ===== */
.topbar{background:var(--c-primary-d);color:#cfe0f2;font-size:13px}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;height:34px}
.topbar a{color:#fff}
.topbar span{margin-right:18px}

/* ===== 导航 ===== */
.nav{position:sticky;top:0;background:#fff;box-shadow:var(--sh-sm);z-index:100}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{display:flex;align-items:center;gap:12px}
.brand-mark{width:44px;height:44px;border-radius:10px;background:linear-gradient(135deg,var(--c-primary),var(--c-teal));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:19px;letter-spacing:1px}
.brand-name{font-size:17px;font-weight:700;color:var(--c-ink);line-height:1.3}
.brand-name small{display:block;font-size:11px;font-weight:400;color:var(--c-gray);letter-spacing:.4px}
.nav-links{display:flex;gap:8px}
.nav-links a{padding:10px 18px;border-radius:8px;font-size:15px;color:var(--c-ink);transition:.2s}
.nav-links a:hover,.nav-links a.on{color:var(--c-primary);background:#eef4fb;font-weight:600}
.nav-toggle{display:none}

/* ===== Hero 轮播 ===== */
.hero{position:relative;height:560px;overflow:hidden;background:var(--c-primary-d)}
.slide{position:absolute;inset:0;opacity:0;transition:opacity 1s;background-size:cover;background-position:center}
.slide.on{opacity:1}
.slide::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(6,30,58,.86) 0%,rgba(6,30,58,.55) 45%,rgba(6,30,58,.15) 100%)}
.slide-inner{position:relative;z-index:2;max-width:var(--wrap);margin:0 auto;padding:150px 24px 0;color:#fff}
.slide h1{font-size:44px;line-height:1.3;font-weight:800;max-width:720px;text-shadow:0 2px 14px rgba(0,0,0,.35)}
.slide h1 em{font-style:normal;color:#7fd8d8}
.slide p{margin-top:16px;font-size:18px;max-width:640px;color:#dbe8f4;text-shadow:0 1px 8px rgba(0,0,0,.4)}
.hero-dots{position:absolute;bottom:28px;left:50%;transform:translateX(-50%);z-index:5;display:flex;gap:10px}
.hero-dots i{width:28px;height:5px;border-radius:3px;background:rgba(255,255,255,.4);cursor:pointer;transition:.3s}
.hero-dots i.on{background:#fff;width:44px}
.hero-badge{position:absolute;right:32px;bottom:88px;z-index:5;background:rgba(255,255,255,.94);border-radius:var(--r-md);padding:14px 22px;box-shadow:var(--sh-md);font-size:13px;color:var(--c-ink);line-height:1.6}
.hero-badge b{color:var(--c-primary);font-size:15px}

/* ===== 区块通用 ===== */
section{padding:76px 0}
.sec-tag{font-size:13px;letter-spacing:2.5px;color:var(--c-teal);font-weight:700;text-transform:uppercase}
.sec-title{font-size:32px;font-weight:800;margin:8px 0 14px;color:var(--c-ink)}
.sec-sub{color:var(--c-gray);max-width:760px;margin-bottom:38px}
.sec-head{text-align:center}
.sec-head .sec-sub{margin-left:auto;margin-right:auto}

/* ===== 卡片网格 ===== */
.grid{display:grid;gap:24px}
.g4{grid-template-columns:repeat(4,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.card{background:#fff;border:1px solid var(--c-line);border-radius:var(--r-md);overflow:hidden;transition:.25s}
.card:hover{transform:translateY(-5px);box-shadow:var(--sh-md)}
.card-img{height:200px;background-size:cover;background-position:center}
.card-body{padding:20px 22px 24px}
.card-body h3{font-size:17px;margin-bottom:8px;color:var(--c-ink)}
.card-body h3 small{display:block;font-size:12px;color:var(--c-teal);font-weight:600;letter-spacing:.5px;margin-bottom:4px}
.card-body p{font-size:14px;color:var(--c-gray);margin-bottom:14px}
.link-more{color:var(--c-primary);font-size:14px;font-weight:600}

/* ===== 数字带 ===== */
.stats{background:linear-gradient(120deg,var(--c-primary-d),var(--c-primary) 55%,var(--c-teal));color:#fff}
.stats .grid{grid-template-columns:repeat(4,1fr);text-align:center}
.stats b{display:block;font-size:40px;font-weight:800}
.stats span{font-size:14px;opacity:.85}

/* ===== 图文分栏 ===== */
.split{display:grid;grid-template-columns:1.05fr 1fr;gap:56px;align-items:center}
.split img{border-radius:var(--r-lg);box-shadow:var(--sh-md)}
.tick li{padding-left:30px;position:relative;margin-bottom:12px;color:var(--c-ink)}
.tick li::before{content:"✔";position:absolute;left:0;color:var(--c-teal);font-weight:800}

/* ===== 产品实拍横带 ===== */
.strip{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.strip figure{position:relative;border-radius:var(--r-md);overflow:hidden;height:210px;cursor:pointer}
.strip img{width:100%;height:100%;object-fit:cover;transition:.4s}
.strip figure:hover img{transform:scale(1.07)}
.strip figcaption{position:absolute;left:0;right:0;bottom:0;padding:26px 14px 10px;background:linear-gradient(transparent,rgba(4,24,44,.85));color:#fff;font-size:13px}

/* ===== 技术方案 ===== */
.tech{background:var(--c-bg)}
.tech-flow{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.tech-flow figure{background:#fff;border:1px solid var(--c-line);border-radius:var(--r-md);overflow:hidden}
.tech-flow img{height:210px;width:100%;object-fit:contain;background:#fff;padding:10px}
.tech-flow figcaption{padding:12px 16px;font-size:13px;color:var(--c-gray);border-top:1px solid var(--c-line)}

/* ===== 资质 ===== */
.lic{display:grid;grid-template-columns:340px 1fr;gap:40px;align-items:center;background:#fff;border:1px solid var(--c-line);border-radius:var(--r-lg);padding:34px}
.lic img{border-radius:10px;box-shadow:var(--sh-sm);border:1px solid var(--c-line)}
.kv{display:grid;grid-template-columns:1fr 1fr;gap:16px 28px}
.kv b{display:block;font-size:12px;color:var(--c-gray);font-weight:400;margin-bottom:2px}
.kv span{font-weight:700;color:var(--c-ink);word-break:break-all}

/* ===== 新闻 ===== */
.news-card .card-img{height:170px}
.news-card .tag{display:inline-block;font-size:12px;color:var(--c-teal);border:1px solid var(--c-teal);border-radius:20px;padding:1px 12px;margin-bottom:8px}
.news-card time{font-size:12px;color:var(--c-gray);margin-left:10px}

/* ===== CTA ===== */
.cta{background:linear-gradient(120deg,var(--c-primary),var(--c-teal));color:#fff;text-align:center;padding:64px 0}
.cta h2{font-size:28px;margin-bottom:10px}
.cta p{opacity:.9;margin-bottom:26px}
.btn{display:inline-block;padding:13px 34px;border-radius:10px;font-size:15px;font-weight:700;transition:.2s;cursor:pointer;border:0}
.btn-w{background:#fff;color:var(--c-primary)}
.btn-w:hover{transform:translateY(-2px);box-shadow:0 8px 20px rgba(0,0,0,.2)}
.btn-p{background:var(--c-primary);color:#fff}
.btn-ghost{border:2px solid #fff;color:#fff;margin-left:14px}
.btn-ghost:hover{background:rgba(255,255,255,.14)}

/* ===== 页脚 ===== */
footer{background:#0c1a28;color:#93a7ba;font-size:14px}
.foot{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:36px;padding:56px 0 40px}
.foot h4{color:#fff;font-size:15px;margin-bottom:16px}
.foot li{margin-bottom:9px}
.foot a:hover{color:#fff}
.foot-brand b{color:#fff;font-size:17px;display:block;margin-bottom:8px}
.copy{border-top:1px solid rgba(255,255,255,.09);padding:18px 0;font-size:12.5px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}
.copy a{color:#c3d2e0}

/* ===== 联系页 ===== */
.contact-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:44px}
.info-item{display:flex;gap:16px;margin-bottom:26px}
.info-ic{width:48px;height:48px;flex:none;border-radius:12px;background:#eef4fb;color:var(--c-primary);display:flex;align-items:center;justify-content:center;font-size:21px}
.info-item b{display:block;font-size:15px;margin-bottom:3px}
.info-item p{color:var(--c-gray);font-size:14px}
.form input,.form textarea,.form select{width:100%;padding:13px 15px;border:1px solid var(--c-line);border-radius:9px;font-size:14px;margin-bottom:16px;font-family:inherit}
.form input:focus,.form textarea:focus{outline:2px solid var(--c-primary);border-color:transparent}
.form h3{margin-bottom:18px}

/* ===== 产品页 ===== */
.crumbs{font-size:13px;color:var(--c-gray);padding:22px 0}
.crumbs a{color:var(--c-primary)}
.pcat{margin-bottom:56px}
.pcat-head{display:flex;align-items:baseline;gap:14px;border-bottom:2px solid var(--c-primary);padding-bottom:12px;margin-bottom:24px}
.pcat-head h2{font-size:22px}
.pcat-head span{color:var(--c-gray);font-size:13px}
.gallery{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.gallery figure{border:1px solid var(--c-line);border-radius:var(--r-md);overflow:hidden;background:#fff;cursor:zoom-in}
.gallery img{height:180px;width:100%;object-fit:cover;transition:.35s}
.gallery figure:hover img{transform:scale(1.06)}
.gallery figcaption{padding:10px 13px;font-size:13px;color:var(--c-gray)}

/* ===== 灯箱 ===== */
#lightbox{position:fixed;inset:0;background:rgba(5,18,34,.92);display:none;align-items:center;justify-content:center;z-index:1000;padding:30px}
#lightbox.on{display:flex}
#lightbox img{max-width:92vw;max-height:88vh;border-radius:8px;box-shadow:0 20px 60px rgba(0,0,0,.5)}
#lb-close{position:absolute;top:22px;right:32px;color:#fff;font-size:38px;cursor:pointer}

/* ===== 响应式 ===== */
@media(max-width:1024px){
  .g4,.gallery,.strip{grid-template-columns:repeat(2,1fr)}
  .g3,.tech-flow{grid-template-columns:repeat(2,1fr)}
  .split,.contact-grid,.lic{grid-template-columns:1fr}
  .slide h1{font-size:34px}
  .foot{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .nav-links{display:none;position:absolute;top:72px;left:0;right:0;background:#fff;flex-direction:column;padding:12px 18px;box-shadow:var(--sh-md)}
  .nav-links.open{display:flex}
  .nav-toggle{display:block;background:none;border:1px solid var(--c-line);border-radius:8px;padding:8px 13px;font-size:19px}
  .g4,.g3,.gallery,.strip,.tech-flow,.stats .grid{grid-template-columns:1fr}
  .hero{height:480px}.slide-inner{padding-top:120px}
  .slide h1{font-size:27px}
  .hero-badge{display:none}
  section{padding:52px 0}
  .sec-title{font-size:25px}
  .foot{grid-template-columns:1fr}
}