/* ============ 基础 ============ */
:root{
  --navy:#0a2540;
  --navy-2:#12365c;
  --blue:#0a6ed1;
  --blue-light:#e8f2fc;
  --amber:#f5a623;
  --red:#d23b32;
  --text:#23303d;
  --gray:#5d6b78;
  --line:#e3e9ef;
  --bg:#fff;
  --bg-gray:#f4f7fa;
  --radius:10px;
  --shadow:0 10px 30px rgba(10,37,64,.08);
  --shadow-hover:0 18px 42px rgba(10,37,64,.16);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Source Han Sans SC",system-ui,sans-serif;
  color:var(--text);background:var(--bg);line-height:1.75;font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.container{width:min(1200px,92%);margin:0 auto}
.hidden{display:none!important}

/* ============ 导航 ============ */
.header{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);transition:.3s}
.header.scrolled{box-shadow:0 4px 18px rgba(10,37,64,.08)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px}
.brand-mark{width:40px;height:40px}
.brand-txt{display:flex;flex-direction:column;line-height:1.15}
.brand-txt strong{font-size:19px;letter-spacing:2px;color:var(--navy)}
.brand-txt em{font-style:normal;font-size:10px;letter-spacing:2.4px;color:var(--gray)}
.nav-links{display:flex;gap:6px}
.nav-links a{padding:8px 14px;font-size:15px;color:var(--text);border-radius:6px;transition:.2s;position:relative}
.nav-links a:hover{color:var(--blue);background:var(--blue-light)}
.nav-links a.active{color:var(--blue)}
.nav-links a.active::after{content:"";position:absolute;left:14px;right:14px;bottom:0;height:2px;background:var(--amber);border-radius:2px}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{width:24px;height:2.4px;background:var(--navy);border-radius:2px;transition:.3s}

/* ============ 首屏 ============ */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;overflow:hidden;color:#fff}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;transform:scale(1.05)}
.hero-mask{position:absolute;inset:0;background:linear-gradient(105deg,rgba(6,22,40,.94) 0%,rgba(8,32,58,.86) 42%,rgba(10,37,64,.55) 100%)}
.hero-inner{position:relative;padding:110px 0 90px;width:min(1200px,92%)}
.hero-eyebrow{font-size:12px;letter-spacing:3px;color:var(--amber);margin-bottom:18px;font-weight:600}
.hero-title{font-size:clamp(30px,5vw,56px);font-weight:800;letter-spacing:3px;line-height:1.2;text-shadow:0 4px 24px rgba(0,0,0,.35)}
.hero-sub{margin-top:18px;font-size:clamp(17px,2.2vw,24px);font-weight:400;color:#dce8f5}
.hero-sub b{color:#fff;font-weight:700;border-bottom:3px solid var(--amber);padding-bottom:2px}
.hero-line{margin-top:14px;font-size:14.5px;letter-spacing:1px;color:#a9c4de}
.hero-actions{margin-top:36px;display:flex;gap:16px;flex-wrap:wrap}
.btn{display:inline-block;padding:13px 34px;border-radius:6px;font-size:15.5px;font-weight:600;letter-spacing:1px;transition:.25s;cursor:pointer;border:1.5px solid transparent}
.btn-primary{background:var(--amber);color:#1b2a3a;border-color:var(--amber)}
.btn-primary:hover{background:#ffb733;transform:translateY(-2px);box-shadow:0 10px 24px rgba(245,166,35,.35)}
.btn-ghost{border-color:rgba(255,255,255,.55);color:#fff}
.btn-ghost:hover{background:#fff;color:var(--navy);transform:translateY(-2px)}
.hero-stats{margin-top:60px;display:grid;grid-template-columns:repeat(4,1fr);gap:20px;max-width:900px}
.hero-stats div{border-left:2px solid rgba(245,166,35,.7);padding-left:16px}
.hero-stats b{display:block;font-size:clamp(24px,3vw,34px);font-weight:800;color:#fff;line-height:1.2}
.hero-stats b em{font-style:normal;font-size:.62em;color:var(--amber);margin-left:2px}
.hero-stats span{font-size:13px;color:#a9c4de;letter-spacing:1px}
.hero-scroll{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);width:26px;height:42px;border:2px solid rgba(255,255,255,.55);border-radius:14px;z-index:2}
.hero-scroll span{position:absolute;left:50%;top:8px;width:4px;height:8px;margin-left:-2px;background:#fff;border-radius:3px;animation:scrolldot 1.6s infinite}
@keyframes scrolldot{0%{opacity:1;transform:translateY(0)}70%{opacity:0;transform:translateY(16px)}100%{opacity:0}}

/* ============ 资质条 ============ */
.trust-bar{background:var(--navy);padding:14px 0}
.trust-inner{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:14px}
.trust-inner span{color:#cfe0f1;font-size:14px;letter-spacing:1px}
.trust-inner i{width:4px;height:4px;border-radius:50%;background:var(--amber)}

/* ============ 通用版块 ============ */
.section{padding:92px 0}
.section-gray{background:var(--bg-gray)}
.section-dark{background:linear-gradient(135deg,var(--navy) 0%,var(--navy-2) 100%);position:relative}
.section-dark::before{content:"";position:absolute;inset:0;background-image:radial-gradient(circle at 85% 15%,rgba(10,110,209,.18),transparent 45%);pointer-events:none}
.sec-head{text-align:center;margin-bottom:54px;position:relative}
.sec-en{font-size:12px;letter-spacing:4px;color:var(--blue);font-weight:700}
.sec-title{font-size:clamp(26px,3.2vw,36px);font-weight:800;color:var(--navy);letter-spacing:2px;margin-top:8px}
.sec-line{display:block;width:56px;height:3px;background:var(--amber);border-radius:2px;margin:16px auto 0}
.sec-desc{margin-top:16px;color:var(--gray);font-size:15px}

/* 浮现动画 */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* ============ 企业简介 ============ */
.about-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:56px;align-items:start}
.about-text p{margin-bottom:16px;color:#3d4c5a;font-size:15.5px}
.about-text b{color:var(--navy)}
.about-slogan{font-size:19px;font-weight:800;color:var(--blue);letter-spacing:4px;margin:22px 0 14px!important}
.about-tags{list-style:none;display:flex;flex-wrap:wrap;gap:10px;margin-top:8px}
.about-tags li{background:var(--blue-light);color:var(--blue);font-size:13px;padding:6px 14px;border-radius:20px;font-weight:600}
.about-imgs{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.about-imgs figure{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);background:#eef2f6}
.about-imgs img{width:100%;height:220px;object-fit:cover;transition:.5s}
.about-imgs figure:hover img{transform:scale(1.05)}
.about-imgs figcaption{font-size:13px;color:var(--gray);text-align:center;padding:8px 0;background:#fff}
.about-imgs .wide{grid-column:1/-1}
.about-imgs .wide img{height:240px}

/* ============ 业务范围 ============ */
.scope-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.scope-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:32px 26px;display:flex;flex-direction:column;gap:10px;transition:.3s;position:relative;overflow:hidden}
.scope-card::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--amber);transform:scaleY(0);transform-origin:top;transition:.3s}
.scope-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-color:#cfe0f3}
.scope-card:hover::before{transform:scaleY(1)}
.scope-ico{width:54px;height:54px;border-radius:12px;background:var(--blue-light);color:var(--blue);display:flex;align-items:center;justify-content:center;margin-bottom:6px}
.scope-ico svg{width:30px;height:30px}
.scope-card b{font-size:19px;color:var(--navy);letter-spacing:1px}
.scope-card small{color:var(--gray);font-size:13.5px}

/* ============ 产品 ============ */
.prod-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.prod-card{border-radius:var(--radius);overflow:hidden;background:#fff;border:1px solid var(--line);transition:.3s;cursor:pointer}
.prod-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.prod-photo{position:relative;height:240px;overflow:hidden;background:#eef2f6}
.prod-photo img{width:100%;height:100%;object-fit:cover;transition:.5s}
.prod-card:hover .prod-photo img{transform:scale(1.06)}
.prod-tag{position:absolute;top:12px;left:12px;background:rgba(10,37,64,.82);color:#fff;font-size:12px;padding:4px 10px;border-radius:4px;letter-spacing:.5px}
.prod-info{padding:20px 20px 22px}
.prod-info h3{font-size:18px;color:var(--navy);display:flex;align-items:center;justify-content:space-between}
.prod-info h3 .arrow{color:var(--blue);font-size:15px;transition:.3s}
.prod-card:hover .arrow{transform:translateX(5px)}
.prod-info p{color:var(--gray);font-size:13.5px;margin-top:8px;line-height:1.6;min-height:44px}
.prod-model{display:inline-block;margin-top:12px;font-size:12px;color:var(--blue);background:var(--blue-light);padding:3px 10px;border-radius:4px;font-weight:600;letter-spacing:.5px}

/* 产品弹层 */
.modal{position:fixed;inset:0;z-index:200;display:none;align-items:center;justify-content:center;padding:24px}
.modal.open{display:flex}
.modal-mask{position:absolute;inset:0;background:rgba(6,20,36,.66);backdrop-filter:blur(3px)}
.modal-box{position:relative;background:#fff;border-radius:14px;max-width:920px;width:100%;max-height:88vh;overflow:auto;box-shadow:0 30px 80px rgba(0,0,0,.35);animation:pop .3s ease}
@keyframes pop{from{opacity:0;transform:translateY(20px) scale(.98)}to{opacity:1;transform:none}}
.modal-close{position:absolute;top:10px;right:14px;z-index:2;width:38px;height:38px;border-radius:50%;border:0;background:rgba(10,37,64,.85);color:#fff;font-size:22px;cursor:pointer;line-height:1}
.modal-close:hover{background:var(--red)}
.modal-body{display:grid;grid-template-columns:1fr 1fr}
.modal-img{background:#eef2f6}
.modal-img img{width:100%;height:100%;object-fit:cover;min-height:320px}
.modal-content{padding:34px 32px}
.modal-content h3{font-size:24px;color:var(--navy);letter-spacing:1px}
.modal-model{margin:10px 0 18px}
.modal-h{font-size:13px;font-weight:700;color:var(--blue);letter-spacing:2px;margin:18px 0 8px;border-left:3px solid var(--amber);padding-left:8px}
.modal-content ul{list-style:none;font-size:14px;color:#3d4c5a}
.modal-content ul li{padding:3px 0 3px 16px;position:relative}
.modal-content ul li::before{content:"";position:absolute;left:0;top:12px;width:6px;height:6px;border-radius:50%;background:var(--amber)}
.spec-table{width:100%;border-collapse:collapse;font-size:13.5px}
.spec-table td{padding:8px 10px;border-bottom:1px solid var(--line)}
.spec-table td:first-child{color:var(--gray);width:46%}
.spec-table td:last-child{color:var(--navy);font-weight:600}

/* ============ 项目 ============ */
.proj-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.proj-card{position:relative;border-radius:var(--radius);overflow:hidden;height:260px;box-shadow:var(--shadow)}
.proj-card img{width:100%;height:100%;object-fit:cover;transition:.55s}
.proj-card:hover img{transform:scale(1.07)}
.proj-mask{position:absolute;inset:0;background:linear-gradient(to top,rgba(6,22,40,.92) 0%,rgba(8,30,54,.25) 55%,transparent 100%)}
.proj-txt{position:absolute;left:0;right:0;bottom:0;padding:22px 20px;color:#fff}
.proj-txt .no{font-size:12px;color:var(--amber);font-weight:700;letter-spacing:2px}
.proj-txt h3{font-size:18px;margin-top:6px;letter-spacing:.5px}
.proj-txt p{font-size:12.5px;color:#c4d6e8;margin-top:6px;opacity:0;max-height:0;transition:.35s}
.proj-card:hover .proj-txt p{opacity:1;max-height:60px}
.partners{margin-top:52px;background:#fff;border:1px dashed #bcd0e4;border-radius:var(--radius);padding:28px 32px}
.partners-t{text-align:center;font-weight:700;color:var(--navy);letter-spacing:2px;margin-bottom:18px}
.partners-list{display:flex;flex-wrap:wrap;justify-content:center;gap:12px 28px}
.partners-list span{font-size:14px;color:var(--gray);position:relative;padding-left:16px}
.partners-list span::before{content:"◆";position:absolute;left:0;top:0;color:var(--amber);font-size:10px;line-height:2.1}

/* ============ 资质 ============ */
.tabs{display:flex;justify-content:center;gap:12px;margin-bottom:36px;flex-wrap:wrap}
.tab{padding:10px 26px;border:1.5px solid var(--line);background:#fff;border-radius:30px;font-size:14.5px;cursor:pointer;color:var(--gray);transition:.25s;font-weight:600}
.tab:hover{border-color:var(--blue);color:var(--blue)}
.tab.active{background:var(--navy);border-color:var(--navy);color:#fff}
.cert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.cert-item{border-radius:8px;overflow:hidden;background:#fff;border:1px solid var(--line);cursor:pointer;transition:.3s}
.cert-item:hover{transform:translateY(-5px);box-shadow:var(--shadow-hover)}
.cert-item img{width:100%;height:230px;object-fit:cover;background:#f2f5f8}
.cert-item figcaption{font-size:13px;text-align:center;padding:10px 8px;color:var(--navy);font-weight:600;line-height:1.4;min-height:48px;display:flex;align-items:center;justify-content:center}

/* 灯箱 */
.lightbox{position:fixed;inset:0;z-index:300;background:rgba(5,16,28,.92);display:none;align-items:center;justify-content:center}
.lightbox.open{display:flex}
.lightbox img{max-width:92vw;max-height:88vh;border-radius:6px;box-shadow:0 20px 70px rgba(0,0,0,.5);cursor:default}
.lb-close,.lb-nav{position:fixed;background:rgba(255,255,255,.12);border:0;color:#fff;font-size:34px;cursor:pointer;width:54px;height:54px;border-radius:50%;transition:.2s;line-height:1;z-index:2}
.lb-close{top:20px;right:24px;font-size:26px}
.lb-prev{left:22px;top:50%;margin-top:-27px}
.lb-next{right:22px;top:50%;margin-top:-27px}
.lb-close:hover,.lb-nav:hover{background:rgba(255,255,255,.28)}

/* ============ 联系 ============ */
.contact-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:stretch;position:relative}
.contact-info h3{color:#fff;font-size:24px;letter-spacing:1px;margin-bottom:26px}
.contact-info ul{list-style:none;display:flex;flex-direction:column;gap:20px}
.contact-info li{display:flex;gap:16px;align-items:flex-start}
.c-ico{flex:none;width:44px;height:44px;border-radius:10px;background:rgba(127,180,232,.15);display:flex;align-items:center;justify-content:center}
.c-ico svg{width:22px;height:22px;stroke:#7fb4e8}
.contact-info b{color:#eaf2fb;font-size:15px}
.contact-info p{color:#a9c4de;font-size:14.5px;margin-top:2px}
.contact-cta{margin-top:30px}
.contact-banner{display:flex;align-items:center;justify-content:center;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:var(--radius)}
.cb-inner{text-align:center;padding:40px}
.cb-logo{width:84px;height:84px;margin:0 auto 16px}
.cb-name{font-size:30px;font-weight:800;color:#fff;letter-spacing:6px}
.cb-en{font-size:13px;letter-spacing:5px;color:#7fb4e8;margin-top:4px}
.cb-slogan{margin-top:26px;color:#cfe0f1;font-size:16px;letter-spacing:2px;line-height:2.2}

/* ============ 页脚 ============ */
.footer{background:#061a2e;padding:26px 0}
.footer-inner{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:8px}
.footer p{color:#8298ad;font-size:13.5px}
.footer-meta{color:#5d7489;font-size:12.5px}

/* ============ 响应式 ============ */
@media(max-width:980px){
  .about-grid{grid-template-columns:1fr;gap:36px}
  .scope-grid,.prod-grid,.proj-grid{grid-template-columns:repeat(2,1fr)}
  .cert-grid{grid-template-columns:repeat(3,1fr)}
  .modal-body{grid-template-columns:1fr}
  .modal-img img{min-height:0;max-height:340px}
  .contact-grid{grid-template-columns:1fr}
}
@media(max-width:720px){
  .nav-links{position:fixed;top:68px;left:0;right:0;background:#fff;flex-direction:column;padding:14px 5%;border-bottom:1px solid var(--line);box-shadow:0 14px 24px rgba(10,37,64,.1);transform:translateY(-130%);transition:.3s;gap:2px}
  .nav-links.open{transform:none}
  .nav-links a{padding:12px 10px;border-bottom:1px solid #f0f3f7}
  .nav-toggle{display:flex}
  .nav-toggle.open span:nth-child(1){transform:translateY(7.4px) rotate(45deg)}
  .nav-toggle.open span:nth-child(2){opacity:0}
  .nav-toggle.open span:nth-child(3){transform:translateY(-7.4px) rotate(-45deg)}
  .section{padding:64px 0}
  .hero-stats{grid-template-columns:repeat(2,1fr);gap:18px;margin-top:42px}
  .scope-grid,.prod-grid,.proj-grid{grid-template-columns:1fr}
  .cert-grid{grid-template-columns:repeat(2,1fr);gap:12px}
  .cert-item img{height:190px}
  .about-imgs{grid-template-columns:1fr}
  .about-imgs .wide{grid-column:auto}
  .trust-inner i{display:none}
  .modal-content{padding:26px 20px}
  .lb-prev{left:6px}.lb-next{right:6px}
  .footer-inner{justify-content:center;text-align:center}
}