:root{
  --navy:#0d2b4e;
  --navy-2:#103a66;
  --cyan:#0fb6c8;
  --cyan-2:#0a93a3;
  --ink:#1f2a37;
  --muted:#5b6b7c;
  --line:#e3eaf1;
  --bg:#ffffff;
  --bg-2:#f4f8fb;
  --bg-3:#eaf3f6;
  --gold:#e0a23c;
  --shadow:0 10px 30px rgba(13,43,78,.08);
  --radius:14px;
  --maxw:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:"Segoe UI","PingFang SC","Microsoft YaHei",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.7;font-size:16px;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block;height:auto}
picture{display:contents}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}

/* ---------- Header ---------- */
.header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);
  backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--navy);font-size:19px}
.brand .logo-mark{width:38px;height:38px;border-radius:9px;object-fit:cover;
  background:#fff;box-shadow:0 4px 14px rgba(13,43,78,.14);display:block}
.brand small{display:block;font-size:11px;color:var(--muted);font-weight:600;letter-spacing:.5px}
.menu{display:flex;gap:4px;list-style:none;margin:0;padding:0}
.menu a{padding:9px 13px;border-radius:8px;color:var(--navy);font-weight:600;font-size:15px;transition:.2s}
.menu a:hover{background:var(--bg-2);color:var(--cyan-2)}
.menu a.active{color:#fff;background:var(--navy)}
.btn{display:inline-block;padding:11px 22px;border-radius:30px;font-weight:700;font-size:15px;transition:.2s;cursor:pointer}
.btn-primary{background:var(--cyan);color:#fff;box-shadow:0 8px 20px rgba(15,182,200,.35)}
.btn-primary:hover{background:var(--cyan-2);transform:translateY(-1px)}
.btn-ghost{border:1.5px solid var(--navy);color:var(--navy)}
.btn-ghost:hover{background:var(--navy);color:#fff}
.hamburger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.hamburger span{width:24px;height:3px;background:var(--navy);border-radius:2px;transition:.3s}

/* ---------- Hero ---------- */
.hero{position:relative;color:#fff;overflow:hidden;
  background:radial-gradient(1200px 500px at 80% -10%,rgba(15,182,200,.45),transparent),
             linear-gradient(135deg,var(--navy),var(--navy-2))}
.hero::after{content:"";position:absolute;inset:0;opacity:.12;
  background-image:linear-gradient(rgba(255,255,255,.5) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.5) 1px,transparent 1px);
  background-size:42px 42px;mask-image:linear-gradient(180deg,#000,transparent)}
.hero .wrap{position:relative;z-index:2;padding:74px 20px 84px}
.hero .tag{display:inline-block;padding:6px 14px;border:1px solid rgba(255,255,255,.4);
  border-radius:30px;font-size:13px;letter-spacing:1px;margin-bottom:18px;background:rgba(255,255,255,.06)}
.hero h1{font-size:42px;line-height:1.2;margin:0 0 16px;font-weight:800}
.hero h1 .hl{color:var(--cyan)}
.hero p.lead{font-size:18px;max-width:680px;color:#d7e6f2}
.hero .cta{margin-top:30px;display:flex;gap:14px;flex-wrap:wrap}
.hero .cta .btn-ghost{color:#fff;border-color:rgba(255,255,255,.6)}
.hero .cta .btn-ghost:hover{background:#fff;color:var(--navy)}
.stat-row{display:flex;flex-wrap:wrap;gap:26px;margin-top:42px}
.stat{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16);
  border-radius:12px;padding:16px 22px;min-width:150px}
.stat b{display:block;font-size:30px;color:var(--cyan);font-weight:800}
.stat span{font-size:13px;color:#cfe0ee}

/* ---------- Sections ---------- */
section{padding:64px 0}
.section-head{text-align:center;max-width:760px;margin:0 auto 40px}
.section-head .eyebrow{color:var(--cyan-2);font-weight:700;letter-spacing:2px;font-size:13px;text-transform:uppercase}
.section-head h2{font-size:32px;margin:10px 0 12px;color:var(--navy)}
.section-head p{color:var(--muted);font-size:16px}
.bg-2{background:var(--bg-2)}
.bg-3{background:var(--bg-3)}

/* ---------- Grids & Cards ---------- */
.grid{display:grid;gap:22px}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;
  box-shadow:var(--shadow);transition:.25s}
.card:hover{transform:translateY(-4px);border-color:#bcd8e0}
.card .ic{width:48px;height:48px;border-radius:12px;display:grid;place-items:center;
  background:var(--bg-3);color:var(--cyan-2);font-size:22px;font-weight:800;margin-bottom:14px}
.card h3{margin:0 0 8px;color:var(--navy);font-size:19px}
.card p{margin:0;color:var(--muted);font-size:15px}
.card .more{display:inline-block;margin-top:12px;color:var(--cyan-2);font-weight:700;font-size:14px}

/* feature list */
.flist{list-style:none;margin:0;padding:0}
.flist li{padding:10px 0 10px 30px;position:relative;border-bottom:1px dashed var(--line)}
.flist li:last-child{border-bottom:0}
.flist li::before{content:"";position:absolute;left:0;top:17px;width:12px;height:12px;
  border-radius:50%;background:var(--cyan)}
.flist li b{color:var(--navy)}

/* split */
.split{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:center}
.split img{border-radius:var(--radius);box-shadow:var(--shadow)}

/* table */
.tbl{width:100%;border-collapse:collapse;background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.tbl th,.tbl td{padding:13px 16px;text-align:left;border-bottom:1px solid var(--line);font-size:15px}
.tbl th{background:var(--navy);color:#fff;font-weight:700}
.tbl tr:nth-child(even) td{background:var(--bg-2)}
.tbl td b{color:var(--navy)}

/* steps */
.steps{counter-reset:s;display:grid;gap:18px}
.step{display:flex;gap:16px;align-items:flex-start}
.step .n{counter-increment:s;flex:0 0 44px;width:44px;height:44px;border-radius:50%;
  background:var(--cyan);color:#fff;font-weight:800;display:grid;place-items:center;font-size:18px}
.step .n::before{content:counter(s)}
.step h4{margin:4px 0 4px;color:var(--navy)}
.step p{margin:0;color:var(--muted);font-size:15px}

/* brand chips */
.chips{display:flex;flex-wrap:wrap;gap:12px}
.chip{background:#fff;border:1px solid var(--line);border-radius:30px;padding:9px 18px;font-weight:700;color:var(--navy);box-shadow:var(--shadow)}
.chip span{color:var(--muted);font-weight:500;font-size:13px;margin-left:6px}

/* case cards */
.case{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.case .cat{font-size:12px;color:var(--cyan-2);font-weight:700;letter-spacing:1px}
.case h4{margin:8px 0;color:var(--navy);font-size:17px}
.case p{margin:0;color:var(--muted);font-size:14px}

/* article */
.article h3{color:var(--navy);margin:30px 0 10px;font-size:22px}
.article h4{color:var(--navy-2);margin:22px 0 8px;font-size:18px}
.article p,.article li{color:#33424f}
.article ul,.article ol{padding-left:22px}
.article li{margin:6px 0}
.article code{background:var(--bg-3);padding:2px 7px;border-radius:6px;font-size:14px;color:var(--cyan-2)}

/* gallery */
.gallery{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.gallery figure{margin:0;border-radius:12px;overflow:hidden;box-shadow:var(--shadow);background:#fff}
.gallery img{width:100%;height:170px;object-fit:cover}
.gallery figcaption{padding:8px 10px;font-size:13px;color:var(--muted)}

/* contact */
.contact-box{display:grid;grid-template-columns:1.2fr 1fr;gap:30px}
.info-list{list-style:none;margin:0;padding:0}
.info-list li{padding:14px 0;border-bottom:1px solid var(--line);display:flex;gap:12px}
.info-list .k{font-weight:700;color:var(--navy);min-width:88px}
.info-list .v{color:var(--muted)}
.note{background:#fff7e8;border:1px solid #f0d9a8;color:#7a5a16;border-radius:10px;padding:12px 16px;font-size:14px;margin:18px 0}

/* CTA band */
.cta-band{background:linear-gradient(135deg,var(--navy),var(--cyan-2));color:#fff;border-radius:18px;
  padding:42px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:20px}
.cta-band h3{margin:0;font-size:26px}
.cta-band p{margin:6px 0 0;color:#d7e6f2}

/* footer */
.footer{background:var(--navy);color:#aebfd0;padding:50px 0 24px}
.footer .cols{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:30px}
.footer h5{color:#fff;font-size:15px;margin:0 0 14px}
.footer a{color:#aebfd0;display:block;padding:5px 0;font-size:14px}
.footer a:hover{color:var(--cyan)}
.footer .brand{color:#fff;margin-bottom:12px}
.footer .desc{font-size:14px;max-width:300px}
.footer .bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:34px;padding-top:18px;
  font-size:13px;color:#8aa0b6;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

/* breadcrumb */
.crumb{padding:16px 0;font-size:14px;color:var(--muted)}
.crumb a{color:var(--cyan-2)}

/* responsive */
@media(max-width:980px){
  .g3,.g4{grid-template-columns:repeat(2,1fr)}
  .gallery{grid-template-columns:repeat(2,1fr)}
  .split,.contact-box{grid-template-columns:1fr}
  .footer .cols{grid-template-columns:1fr 1fr}
}
@media(max-width:760px){
  .menu{position:fixed;top:68px;left:0;right:0;background:#fff;flex-direction:column;
    padding:14px 20px;gap:4px;box-shadow:var(--shadow);transform:translateY(-130%);transition:.3s;border-bottom:1px solid var(--line)}
  .menu.open{transform:translateY(0)}
  .menu a{font-size:16px;padding:12px 14px}
  .hamburger{display:flex}
  .nav .btn{display:none}
  .hero h1{font-size:30px}
  .hero p.lead{font-size:16px}
  .g2,.g3,.g4{grid-template-columns:1fr}
  .gallery{grid-template-columns:1fr 1fr}
  section{padding:46px 0}
  .section-head h2{font-size:26px}
  .footer .cols{grid-template-columns:1fr}
  .cta-band{padding:28px}
}

/* 品牌矩阵 logo 网格 */
.brand-matrix{max-width:1120px;margin:0 auto}
.bm-h{font-size:18px;font-weight:800;margin:30px 0 14px;padding-left:12px;border-left:4px solid var(--primary,#2f6fed)}
.bm-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px}
.bm-card{background:#fff;border:1px solid var(--line,#e6e8ee);border-radius:12px;padding:16px 12px;text-align:center;transition:.2s}
.bm-card:hover{box-shadow:0 6px 20px rgba(0,0,0,.08);transform:translateY(-2px)}
.bm-logo{height:64px;display:flex;align-items:center;justify-content:center;margin-bottom:10px;padding:0 6px}
.bm-logo img{max-height:64px;max-width:100%;object-fit:contain}
.bm-name{display:block;font-weight:700;font-size:15px;color:var(--ink,#1a2233)}
.bm-tag{display:block;font-size:12px;color:var(--muted,#6b7280);margin-top:4px}
.bm-note{margin-top:22px;font-size:12px;color:var(--muted,#6b7280);line-height:1.7}

/* 品牌卡片作为官网链接 */
a.bm-card{color:inherit;text-decoration:none;display:flex;flex-direction:column;align-items:center}
a.bm-card:hover .bm-logo{box-shadow:0 6px 18px rgba(20,90,160,.18);border-color:#1a6fb5}

/* 配套品类角标（非主线品类的降格标注） */
h3 .sub-tag{display:inline-block;margin-left:8px;padding:1px 8px;border:1px solid var(--cyan-2,#0a93a3);color:var(--cyan-2,#0a93a3);border-radius:20px;font-size:11px;font-weight:600;vertical-align:2px;white-space:nowrap}

/* 顶部热线条（服务热线） */
.topbar{background:linear-gradient(90deg,#0a2543,#12355f 55%,#0e5c6e);color:#dbe6f0;font-size:13px}
.topbar-in{display:flex;align-items:center;justify-content:space-between;height:38px;gap:14px}
.topbar-slogan{color:#8fa9c4;letter-spacing:.4px;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}
.topbar-slogan b{color:#cfe0ef;font-weight:600}
.topbar-tel{display:inline-flex;align-items:center;gap:8px;color:#fff;font-weight:800;font-size:15px;text-decoration:none;letter-spacing:.5px;flex-shrink:0}
.topbar-tel svg{color:#ffc24d}
.topbar-tel:hover{color:#ffc24d}
.topbar-tel small{font-weight:600;font-size:12px;color:#b9c9da;letter-spacing:1px}
@media(max-width:720px){
  .topbar-slogan{display:none}
  .topbar-in{justify-content:center;height:40px}
  .topbar-tel{font-size:16px}
}
@media(max-width:400px){
  .topbar-tel small{display:none}
}

/* ===== GEO：FAQ 区块（结构化数据与正文同源，AI 友好） ===== */
.faq-block{max-width:var(--maxw);margin:0 auto;padding:56px 20px 8px}
.faq-block h2{font-size:28px;color:var(--navy);margin:0 0 24px;text-align:center;font-weight:800}
.faq-item{border:1px solid var(--line);border-radius:var(--radius);background:var(--bg);
  margin-bottom:12px;box-shadow:var(--shadow);overflow:hidden}
.faq-item summary{cursor:pointer;padding:16px 20px 16px 46px;font-weight:700;font-size:16px;
  color:var(--ink);list-style:none;position:relative;line-height:1.6}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::before{content:"?";position:absolute;left:16px;top:15px;width:20px;height:20px;
  border-radius:50%;background:var(--cyan);color:#fff;font-size:13px;font-weight:800;
  display:flex;align-items:center;justify-content:center}
.faq-item[open] summary{color:var(--cyan-2)}
.faq-item summary:hover{background:#f7fafc}
.faq-item p{margin:0;padding:0 20px 18px 46px;color:var(--muted);font-size:15px;line-height:1.85}
@media(max-width:720px){
  .faq-block{padding:40px 16px 4px}
  .faq-block h2{font-size:22px}
  .faq-item summary{font-size:15px;padding:14px 16px 14px 40px}
  .faq-item summary::before{left:12px;top:13px}
  .faq-item p{padding:0 16px 16px 40px;font-size:14px}
}

/* ===== GEO：文章「要点速览」（答案前置，AI 友好） ===== */
.tldr{border-left:4px solid var(--cyan);background:#f7fafc;border-radius:0 var(--radius) var(--radius) 0;
  padding:16px 20px;margin:0 0 26px}
.tldr h2{font-size:15px;font-weight:800;color:var(--cyan-2);margin:0 0 8px;letter-spacing:.04em}
.tldr p{margin:0;color:var(--ink);font-size:15.5px;line-height:1.85}
@media(max-width:720px){.tldr{padding:14px 16px;margin-bottom:20px}.tldr p{font-size:15px}}