:root{
  --teal:#0F766E; --teal-d:#0B5C56; --navy:#0F172A; --navy-2:#1E293B;
  --light:#F9FAFB; --alt:#F1F5F9; --line:#E2E8F0; --muted:#64748B; --txt:#1E293B;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{font-family:"Noto Sans SC","Microsoft YaHei",sans-serif;color:var(--txt);background:#fff;line-height:1.75;-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:inherit}
img{max-width:100%}
.container{width:100%;max-width:1180px;margin:0 auto;padding:0 24px}

/* NAV */
.nav{position:sticky;top:0;z-index:200;background:#0F172A;color:#fff}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{font-size:20px;font-weight:800;letter-spacing:1px;display:flex;align-items:center;gap:9px}
.brand .mark{display:inline-flex;width:34px;height:34px;align-items:center;justify-content:center;background:var(--teal);border-radius:8px;font-size:18px}
.nav-links{display:flex;gap:24px;list-style:none;font-size:15px}
.nav-links a{color:#CBD5E1;transition:.2s}
.nav-links a:hover{color:#fff}
.nav-cta{background:var(--teal);color:#fff;border:none;padding:9px 18px;border-radius:8px;font-size:14px;cursor:pointer;transition:.2s}
.nav-cta:hover{background:var(--teal-d)}
/* 移动端菜单遮罩层：点遮罩关闭菜单，并明确"菜单已弹出"的视觉反馈 */
.nav-overlay{position:fixed;inset:0;background:rgba(2,6,23,.45);z-index:90;display:none}
.nav-overlay.show{display:block}

/* HERO */
.hero{background:linear-gradient(135deg,#0F172A 0%,#0B3B38 100%);color:#fff;padding:92px 0}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:50px;align-items:center}
.badge{display:inline-block;padding:6px 14px;border:1px solid rgba(255,255,255,.25);border-radius:999px;font-size:13px;color:#99F6E4;margin-bottom:20px}
.hero h1{font-size:46px;line-height:1.2;font-weight:800;margin-bottom:18px}
.hero p{color:#CBD5E1;font-size:17px;margin-bottom:28px;max-width:540px}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap}
.btn{padding:12px 24px;border-radius:10px;font-size:15px;font-weight:600;cursor:pointer;transition:.2s;display:inline-block}
.btn-primary{background:var(--teal);color:#fff}
.btn-primary:hover{background:var(--teal-d)}
.btn-ghost{border:1px solid rgba(255,255,255,.35);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.1)}
.hero-img img{width:100%;border-radius:16px;box-shadow:0 30px 60px rgba(0,0,0,.4)}

/* SECTION BASE */
section{padding:84px 0}
.bg-white{background:#fff}
.bg-alt{background:var(--light)}
.eyebrow{color:var(--teal);font-weight:700;letter-spacing:2px;font-size:14px;margin-bottom:10px}
.sec-title{font-size:34px;font-weight:800;color:var(--navy);margin-bottom:14px}
.sec-desc{color:var(--muted);font-size:16px;max-width:760px;margin-bottom:40px}

/* ABOUT */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center}
.about-text p{margin-bottom:16px;color:#334155}
.about-media img{width:100%;border-radius:14px;box-shadow:0 16px 40px rgba(0,0,0,.12)}

/* STATS BAND */
.stats-band{background:var(--navy);color:#fff;padding:0}
.stats{display:grid;grid-template-columns:repeat(6,1fr)}
.stat{padding:38px 16px;text-align:center;border-right:1px solid rgba(255,255,255,.08)}
.stat:last-child{border-right:none}
.stat .num{font-size:24px;font-weight:800;color:#5EEAD4;line-height:1.2}
.stat .lbl{font-size:13.5px;color:#CBD5E1;margin-top:8px}

/* SERVICES */
.seg-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-bottom:54px}
.seg{background:#fff;border:1px solid var(--line);border-radius:16px;padding:26px;transition:.2s}
.seg:hover{transform:translateY(-4px);box-shadow:0 18px 40px rgba(15,118,110,.12);border-color:var(--teal)}
.seg .seg-ico{width:48px;height:48px;border-radius:12px;background:rgba(15,118,110,.1);color:var(--teal);display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:800;margin-bottom:14px}
.seg h3{font-size:19px;color:var(--navy);margin-bottom:8px}
.seg p{color:var(--muted);font-size:14.5px}
.sys-head{font-size:20px;font-weight:800;color:var(--navy);margin-bottom:18px;display:flex;align-items:center;gap:10px}
.sys-head::before{content:"";width:6px;height:22px;background:var(--teal);border-radius:3px;display:inline-block}
.sys-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(155px,1fr));gap:14px}
.sys{background:var(--alt);border-radius:12px;padding:16px;text-align:center;font-size:15px;font-weight:600;color:#334155;transition:.2s}
.sys:hover{background:rgba(15,118,110,.1);color:var(--teal-d)}

/* ADVANTAGES */
.adv-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.adv{background:#fff;border-radius:16px;padding:28px;border-top:4px solid var(--teal);box-shadow:0 8px 24px rgba(0,0,0,.04)}
.adv .adv-no{font-size:30px;font-weight:800;color:rgba(15,118,110,.18);line-height:1}
.adv h3{font-size:18px;color:var(--navy);margin:8px 0 10px}
.adv p{color:var(--muted);font-size:14.5px}

/* CASES */
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.case-grid img{width:100%;height:220px;object-fit:cover;border-radius:12px;transition:.2s}
.case-grid img:hover{transform:scale(1.03);box-shadow:0 14px 30px rgba(0,0,0,.15)}
.table-wrap{margin-top:36px;overflow-x:auto;border-radius:12px;border:1px solid var(--line);background:#fff}
.table{width:100%;border-collapse:collapse;font-size:14.5px;min-width:640px}
.table th{background:var(--navy);color:#fff;padding:13px 16px;text-align:left;font-weight:600;white-space:nowrap}
.table td{padding:12px 16px;border-bottom:1px solid var(--line);color:#334155;vertical-align:top}
.table tr:nth-child(even) td{background:var(--light)}
.table tr:last-child td{border-bottom:none}

/* CERT */
.cert-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:44px}
.cert-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:30px 24px;text-align:center;transition:.2s}
.cert-card:hover{transform:translateY(-4px);box-shadow:0 18px 40px rgba(0,0,0,.08)}
.cert-emblem{width:58px;height:58px;border-radius:50%;background:var(--teal);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-size:22px;font-weight:800;margin-bottom:14px}
.cert-name{font-weight:700;color:var(--navy);margin-bottom:6px;font-size:16px}
.cert-issuer{color:var(--muted);font-size:14px}
.client-groups{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}
.cgroup{background:#fff;border:1px solid var(--line);border-left:4px solid var(--teal);border-radius:12px;padding:18px 20px}
.cgroup h4{color:var(--navy);font-size:16px;margin-bottom:8px}
.cgroup p{color:var(--muted);font-size:14.5px}

/* CLIENTS / FIELDS */
.field-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px;margin-top:8px}
.field{background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px;text-align:center;font-size:15px;color:#334155}
.region{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:36px}
.region .reg{background:var(--navy);color:#fff;border-radius:14px;padding:22px}
.region .reg h4{color:#5EEAD4;font-size:15px;margin-bottom:8px}
.region .reg p{color:#CBD5E1;font-size:14px;line-height:1.6}
.tier{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:36px}
.tier .tier-box{background:#fff;border:1px solid var(--line);border-radius:14px;padding:24px}
.tier .tier-box h4{color:var(--teal-d);font-size:17px;margin-bottom:12px}
.tier .tier-box li{color:#334155;font-size:15px;margin-bottom:7px;margin-left:18px}

/* STORY */
.story-item{display:grid;grid-template-columns:56px 1fr;gap:22px;padding:24px 0;border-bottom:1px solid var(--line)}
.story-item:last-child{border-bottom:none}
.story-item .step{width:52px;height:52px;border-radius:50%;background:var(--teal);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:18px}
.story-item h3{color:var(--navy);margin-bottom:8px;font-size:19px}
.story-item p{color:var(--muted);font-size:15px}

/* CONTACT */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:44px}
.contact-info .ci{display:flex;gap:14px;margin-bottom:18px;align-items:flex-start}
.contact-info .ci .k{color:var(--teal);font-weight:700;min-width:78px;font-size:15px;padding-top:1px}
.contact-info .ci .v{color:#334155;font-size:15.5px}
.form{background:#fff;border:1px solid var(--line);border-radius:16px;padding:30px}
.form h3{font-size:20px;color:var(--navy);margin-bottom:6px}
.form p.fsub{color:var(--muted);font-size:14px;margin-bottom:6px}
.form label{display:block;font-size:14px;color:#334155;margin:16px 0 6px;font-weight:600}
.form input,.form select,.form textarea{width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:9px;font-size:14px;font-family:inherit;background:#fff;color:#1E293B}
.form textarea{resize:vertical;min-height:88px}
.form button{margin-top:20px;width:100%;background:var(--teal);color:#fff;border:none;padding:13px;border-radius:10px;font-size:15px;font-weight:700;cursor:pointer;transition:.2s}
.form button:hover{background:var(--teal-d)}
.form .ok{display:none;margin-top:14px;background:rgba(15,118,110,.1);color:var(--teal-d);padding:12px;border-radius:9px;font-size:14px;text-align:center}

/* FOOTER */
.footer{background:var(--navy);color:#CBD5E1;padding:56px 0 28px}
.footer-top{display:grid;grid-template-columns:2fr 1fr 1fr;gap:30px}
.footer h4{color:#fff;margin-bottom:14px;font-size:16px}
.footer ul{list-style:none}
.footer li{margin-bottom:8px;font-size:14px}
.footer .brand{color:#fff;margin-bottom:12px}
.footer-tagline{margin-bottom:12px;color:#94A3B8;max-width:360px}
.footer-addr{color:#94A3B8;font-size:14px;line-height:1.7}
.footer-divider{border-top:1px solid rgba(255,255,255,.1);margin:28px 0}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:13px;color:#94A3B8}

@media(max-width:900px){
 .hero-grid,.about-grid,.contact-grid,.tier{grid-template-columns:1fr}
 .seg-grid,.adv-grid,.cert-grid,.case-grid{grid-template-columns:1fr 1fr}
 .stats{grid-template-columns:1fr 1fr}
 .region{grid-template-columns:1fr 1fr}
}
@media(max-width:560px){
 .seg-grid,.adv-grid,.cert-grid,.case-grid,.stats,.region,.field-grid{grid-template-columns:1fr}
 .hero h1{font-size:34px}
 .sec-title{font-size:26px}
 .footer-top{grid-template-columns:1fr}
}

/* 首页：板块入口卡片 */
.entry-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:8px}
.entry-card{display:block;background:#fff;border:1px solid var(--line);border-radius:16px;padding:28px;transition:.2s;border-top:4px solid var(--teal)}
.entry-card:hover{transform:translateY(-4px);box-shadow:0 18px 40px rgba(15,118,110,.12)}
.entry-card h3{font-size:19px;color:var(--navy);margin-bottom:8px}
.entry-card p{color:var(--muted);font-size:14.5px}
.entry-card .more{color:var(--teal);font-weight:700;font-size:14px;margin-top:14px;display:inline-block}
/* 首页：核心优势概览 */
.teaser-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.teaser{background:var(--alt);border-radius:16px;padding:28px}
.teaser .t-no{font-size:28px;font-weight:800;color:rgba(15,118,110,.2);line-height:1}
.teaser h3{font-size:18px;color:var(--navy);margin:8px 0 10px}
.teaser p{color:var(--muted);font-size:14.5px}
@media(max-width:900px){.entry-grid,.teaser-grid{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.entry-grid,.teaser-grid{grid-template-columns:1fr}}
/* 移动端菜单（纯 CSS 勾选法，不依赖 JS，移动端稳定展开/收起） */
.nav-chk{display:none}
.nav-toggle{display:none;background:none;border:none;color:#fff;font-size:26px;line-height:1;cursor:pointer;padding:6px 10px;margin-left:auto;user-select:none;-webkit-tap-highlight-color:transparent}
.nav-toggle::before{content:"☰"}
.nav-links a.active{color:#fff}
.nav-overlay{position:fixed;inset:0;background:rgba(2,6,23,.45);z-index:90;display:none}
@media(max-width:900px){
 .nav-toggle{display:block}
 .nav-cta{display:none}
  .nav-links{display:none;position:absolute;top:100%;left:0;right:0;flex-direction:column;gap:0;
   background:#0F172A;box-shadow:0 12px 30px rgba(0,0,0,.28);max-height:calc(100vh - 68px);
   overflow-y:auto;padding:6px 0;z-index:1000}
 .nav-chk:checked ~ .nav-links{display:flex}
 .nav-chk:checked ~ .nav-toggle::before{content:"✕"}
 .nav-chk:checked ~ .nav-overlay{display:block}
 .nav-links li{border-bottom:1px solid rgba(255,255,255,.08)}
 .nav-links li:last-child{border-bottom:none}
 .nav-links a{display:block;padding:15px 22px;font-size:16px}
}
/* FAQ 板块（services 页） */
.faq-list{display:grid;gap:16px;margin-top:8px}
.faq-item{background:#fff;border:1px solid var(--line);border-left:4px solid var(--teal);border-radius:14px;padding:22px 26px}
.faq-q{font-size:18px;color:var(--navy);margin-bottom:10px;font-weight:700;line-height:1.5}
.faq-a{color:#334155;font-size:15.5px;line-height:1.8;margin:0}
/* 服务网络（advantages 页） */
.net-lead{font-size:17px;color:#334155;line-height:1.95;max-width:900px;margin-top:6px}
.net-lead strong{color:var(--teal)}
@media(max-width:900px){
 .faq-item{padding:18px 20px}
}

/* 首页核心服务关键词带 */
.hero-kw{list-style:none;display:flex;flex-wrap:wrap;gap:10px;padding:0;margin:22px 0 0}
.hero-kw li a{display:inline-block;padding:7px 14px;border:1px solid rgba(255,255,255,.22);border-radius:999px;color:rgba(255,255,255,.82);font-size:13px;text-decoration:none;transition:.2s}
.hero-kw li a:hover{border-color:var(--teal);color:#fff;background:rgba(15,118,110,.28)}
@media(max-width:768px){.hero-kw li a{font-size:12px;padding:6px 11px}}

/* 品牌区 logo 图片 */
.brand-logo{width:34px;height:34px;display:block;object-fit:contain;flex:none}

/* 资质画廊（certs 页） */
.cert-cat{margin-top:14px;margin-bottom:44px}
.cert-cat .cat-head{display:flex;align-items:baseline;gap:12px;margin-bottom:20px;border-left:4px solid var(--teal);padding-left:14px}
.cert-cat .cat-head h2{font-size:22px;color:var(--navy);font-weight:800;line-height:1.2}
.cert-cat .cat-count{color:var(--muted);font-size:14px}
.cert-gallery{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.cert-fig{position:relative;display:block;background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;transition:.2s;text-decoration:none}
.cert-fig:hover{transform:translateY(-4px);box-shadow:0 18px 40px rgba(15,118,110,.12);border-color:var(--teal)}
.cert-fig img{width:100%;height:300px;object-fit:contain;background:#fff;display:block}
.cert-cap{display:block;padding:12px 14px;font-size:14px;font-weight:600;color:var(--navy);text-align:center;border-top:1px solid var(--line);min-height:62px;display:flex;align-items:center;justify-content:center}
.cert-fig.cert-doc{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;padding:24px;min-height:300px}
.cert-fig.cert-doc .doc-badge{width:58px;height:58px;border-radius:12px;background:var(--teal);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:17px;letter-spacing:.5px}
.cert-fig.cert-doc .cert-cap{border-top:none;padding:0;min-height:auto}
.cert-fig.cert-doc .cert-dl{font-size:13px;color:var(--teal);font-weight:600}
@media(max-width:900px){.cert-gallery{grid-template-columns:1fr 1fr 1fr}}
@media(max-width:640px){.cert-gallery{grid-template-columns:1fr 1fr}.cert-fig img{height:220px}.cert-fig.cert-doc{min-height:220px}}
/* 灯箱 */
.lightbox{position:fixed;inset:0;background:rgba(15,23,42,.93);display:none;align-items:center;justify-content:center;flex-direction:column;z-index:1000;padding:40px}
.lightbox.open{display:flex}
.lightbox .lb-img{max-width:92vw;max-height:80vh;border-radius:8px;box-shadow:0 30px 80px rgba(0,0,0,.5);background:#fff}
.lightbox .lb-cap{color:#fff;margin-top:16px;font-size:15px;text-align:center;max-width:82vw}
.lightbox .lb-close{position:absolute;top:18px;right:26px;background:none;border:none;color:#fff;font-size:40px;cursor:pointer;line-height:1;opacity:.85;transition:.2s}
.lightbox .lb-close:hover{opacity:1}

/* ===== 移动端增强（手机 / 小平板），集中优化触摸体验 ===== */
@media(max-width:900px){
  /* 平板竖屏：页脚三块堆叠为单列，避免拥挤 */
  .footer-top{grid-template-columns:1fr}
}
@media(max-width:560px){
  /* 减小区块上下留白，缩短手机滚动长度 */
  section{padding:56px 0}
  /* 收窄两侧安全边距，让正文更宽 */
  .container{padding:0 18px}
  /* 表单控件字号 ≥16px，避免 iOS 聚焦自动放大页面 */
  .form input,.form select,.form textarea{font-size:16px}
  /* 统计条单列时用分隔线代替右侧竖线 */
  .stats .stat{border-right:none;border-bottom:1px solid rgba(255,255,255,.08)}
  .stats .stat:last-child{border-bottom:none}
  /* 案例表格在极小屏略缩字号，配合横向滚动更易读 */
  .table{font-size:13px}
  /* 证书灯箱在手机上减少边距，关闭按钮更贴合 */
  .lightbox{padding:16px}
  .lightbox .lb-close{top:8px;right:12px;font-size:34px}
  .lightbox .lb-img{max-width:96vw;max-height:82vh}
  /* 联系表单卡片内边距收窄 */
  .form{padding:22px 18px}
  /* hero 内边距收敛 */
  .hero{padding:64px 0}
}
@media(max-width:480px){
  /* 证书画廊在窄屏单列，便于看清证书文字 */
  .cert-gallery{grid-template-columns:1fr}
  .cert-fig img{height:260px}
  .cert-fig.cert-doc{min-height:200px}
}
@media(max-width:380px){
  .hero h1{font-size:30px}
  .sec-title{font-size:23px}
  .brand{font-size:17px}
}