/* =========================================================
   北京中云汇创 · 官网重构 (基于产品手册2026)  style.css
   主题：科技蓝 + 信号青/橙，广播波形视觉语言
   信息架构核心：云声® / 云智® / 云伴® 三大产品体系
   ========================================================= */
:root{
  --navy:#0A1F3C;
  --navy-2:#102a52;
  --blue:#1457B8;
  --blue-600:#0f4aa0;
  --cyan:#21C7E0;
  --amber:#FF8A3D;
  --amber-600:#f2701f;
  --bg:#F4F8FD;
  --bg-soft:#EEF4FB;
  --ink:#1A2233;
  --ink-2:#46506A;
  --line:#E2EAF4;
  --white:#fff;
  --shadow:0 10px 30px rgba(16,42,82,.10);
  --shadow-lg:0 18px 50px rgba(16,42,82,.16);
  --radius:16px;
  --maxw:1180px;
  --font:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Segoe UI",system-ui,-apple-system,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
.wrap{width:min(var(--maxw),92vw);margin:0 auto}
.section{padding:88px 0}
.section-head{text-align:center;max-width:760px;margin:0 auto 52px}
.eyebrow{display:inline-block;font-size:13px;letter-spacing:3px;color:var(--blue);font-weight:700;text-transform:uppercase;margin-bottom:14px}
.section-head h2{font-size:clamp(26px,3.4vw,40px);color:var(--navy);letter-spacing:1px;line-height:1.25}
.section-head p{margin-top:14px;color:var(--ink-2);font-size:16px}
.btn{display:inline-flex;align-items:center;gap:8px;border:none;cursor:pointer;font-family:inherit;font-size:15px;font-weight:600;padding:13px 26px;border-radius:50px;transition:.25s ease}
.btn-primary{background:linear-gradient(120deg,var(--blue),var(--cyan));color:#fff;box-shadow:0 8px 22px rgba(20,87,184,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(20,87,184,.45)}
.btn-amber{background:linear-gradient(120deg,var(--amber),var(--amber-600));color:#fff;box-shadow:0 8px 22px rgba(255,138,61,.35)}
.btn-amber:hover{transform:translateY(-2px)}
.btn-ghost{background:rgba(255,255,255,.12);color:#fff;border:1px solid rgba(255,255,255,.35)}
.btn-ghost:hover{background:rgba(255,255,255,.22)}
.btn-line{background:#fff;color:var(--blue);border:1.5px solid var(--line)}
.btn-line:hover{border-color:var(--blue);background:var(--bg-soft)}

/* ---------- Header / Nav ---------- */
.header{position:fixed;top:0;left:0;right:0;z-index:50;transition:.3s}
.header .bar{display:flex;align-items:center;justify-content:space-between;height:74px}
.header.transparent{background:transparent}
.header.solid{background:rgba(255,255,255,.92);backdrop-filter:blur(10px);box-shadow:0 4px 20px rgba(16,42,82,.08)}
.logo{display:flex;align-items:center;transition:.3s}
.logo-img{display:block;height:44px;width:auto;max-width:220px;object-fit:contain;border-radius:6px}
/* 首页透明导航栏下，深色 logo 需白底衬托 */
.header.transparent .logo-img{background:#fff;padding:5px 10px;box-shadow:0 2px 10px rgba(0,0,0,.18)}
.header.solid .logo-img{background:transparent;padding:0;box-shadow:none}
/* 保留旧版文字 logo 的兼容性（若某处未替换） */
.logo .mark{width:38px;height:38px;border-radius:10px;background:linear-gradient(135deg,var(--blue),var(--cyan));display:grid;place-items:center;flex:none}
.logo .mark svg{width:22px;height:22px}
.logo .txt b{font-size:18px;letter-spacing:1px;display:block;line-height:1.1}
.logo .txt span{font-size:11px;font-weight:600;letter-spacing:2px;opacity:.8}
.nav{display:flex;align-items:center;gap:26px}
.nav a{font-size:15px;font-weight:500;color:#fff;opacity:.9;position:relative;transition:.25s}
.header.solid .nav a{color:var(--ink-2)}
.nav a::after{content:"";position:absolute;left:0;bottom:-7px;width:0;height:2px;background:var(--cyan);transition:.25s}
.nav a:hover{opacity:1}
.nav a:hover::after,.nav a.active::after{width:100%}
.header .phone{display:flex;align-items:center;gap:8px;color:#fff;font-weight:700;font-size:15px;background:rgba(255,255,255,.14);padding:9px 16px;border-radius:50px}
.header.solid .phone{color:var(--blue);background:var(--bg-soft)}
.header .phone svg{width:16px;height:16px}
.hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
.hamburger span{width:24px;height:2px;background:var(--navy);border-radius:2px;transition:.3s}
.header.transparent .hamburger span{background:#fff}

/* ---------- Hero ---------- */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;color:#fff;overflow:hidden;background:radial-gradient(120% 120% at 80% 0%,#16386e 0%,#0A1F3C 55%,#07152b 100%)}
.hero .waves{position:absolute;inset:0;opacity:.5;pointer-events:none}
.hero .glow{position:absolute;width:520px;height:520px;border-radius:50%;background:radial-gradient(circle,rgba(33,199,224,.35),transparent 65%);top:-120px;right:-80px;filter:blur(20px)}
.hero .grid-dot{position:absolute;inset:0;background-image:radial-gradient(rgba(255,255,255,.06) 1px,transparent 1px);background-size:26px 26px;opacity:.6}
.hero .wrap{position:relative;z-index:2;padding-top:96px;display:flex;align-items:center;gap:48px}
.hero-copy{flex:1 1 560px;max-width:640px}
.hero-visual{flex:0 0 360px;position:relative;animation:floaty 6s ease-in-out infinite}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}
.hv-badge{position:absolute;top:-14px;right:-6px;z-index:3;background:linear-gradient(120deg,var(--amber),var(--amber-600));color:#fff;font-size:12px;font-weight:700;padding:7px 14px;border-radius:50px;box-shadow:0 8px 20px rgba(255,138,61,.4);white-space:nowrap}
.hv-card{position:relative;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);border-radius:16px;padding:18px 20px;margin-bottom:16px;backdrop-filter:blur(6px);box-shadow:0 12px 30px rgba(4,15,35,.28)}
.hv-card .hv-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}
.hv-card .hv-head b{font-size:18px;letter-spacing:1px}
.hv-card .hv-head span{font-size:12px;color:rgba(255,255,255,.7)}
.hv-eq{display:flex;align-items:flex-end;gap:4px;height:36px}
.hv-eq i{width:5px;height:40%;border-radius:3px;background:linear-gradient(180deg,var(--cyan),var(--blue));animation:eq 1s ease-in-out infinite}
.hv-eq i:nth-child(3n){animation-duration:1.3s;animation-delay:.2s}
.hv-eq i:nth-child(3n+1){animation-duration:.8s;animation-delay:.1s}
.hv-eq i:nth-child(3n+2){animation-duration:1.1s;animation-delay:.35s}
@keyframes eq{0%,100%{height:30%}50%{height:100%}}
.hv-desc{font-size:12.5px;color:rgba(255,255,255,.72);margin-top:11px}
.hero .tag{display:inline-flex;align-items:center;gap:8px;background:rgba(33,199,224,.16);border:1px solid rgba(33,199,224,.4);color:var(--cyan);padding:7px 16px;border-radius:50px;font-size:13px;font-weight:600;letter-spacing:1px;margin-bottom:22px}
.hero h1{font-size:clamp(30px,5vw,56px);line-height:1.18;letter-spacing:1px;font-weight:800;max-width:880px}
.hero h1 .hl{background:linear-gradient(120deg,var(--cyan),#7fe7ff);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{margin:24px 0 30px;font-size:18px;max-width:640px;color:rgba(255,255,255,.82)}
.hero .cta{display:flex;gap:16px;flex-wrap:wrap}
.hero .brandrow{display:flex;gap:14px;flex-wrap:wrap;margin-top:40px}
.hero .brand{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.16);border-radius:14px;padding:16px 20px;min-width:200px;backdrop-filter:blur(4px)}
.hero .brand b{font-size:19px;letter-spacing:1px}
.hero .brand b i{font-style:normal;color:var(--cyan)}
.hero .brand span{display:block;font-size:13px;color:rgba(255,255,255,.72);margin-top:3px}
.hero .stats{display:flex;gap:38px;margin-top:46px;flex-wrap:wrap}
.hero .stat b{font-size:30px;font-weight:800;color:#fff;display:block;line-height:1}
.hero .stat span{font-size:13px;color:rgba(255,255,255,.7);letter-spacing:1px}
.scroll-cue{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);color:rgba(255,255,255,.6);font-size:12px;letter-spacing:2px;z-index:2;animation:bob 2s infinite}
@keyframes bob{0%,100%{transform:translate(-50%,0)}50%{transform:translate(-50%,8px)}}

/* ---------- Systems overview (三大体系总览) ---------- */
.systems{background:var(--white)}
.sys-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.sys{position:relative;border-radius:var(--radius);padding:34px 28px;color:#fff;overflow:hidden;min-height:300px;display:flex;flex-direction:column;transition:.3s}
.sys:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.sys.c1{background:linear-gradient(150deg,#0A1F3C,#1457B8)}
.sys.c2{background:linear-gradient(150deg,#0d3a6b,#21C7E0)}
.sys.c3{background:linear-gradient(150deg,#5a2a8a,#a14bd6)}
.sys .bg{position:absolute;inset:0;opacity:.18;pointer-events:none}
.sys .badge{display:inline-flex;align-items:baseline;gap:8px;font-weight:800;margin-bottom:6px}
.sys .badge .cn{font-size:34px;letter-spacing:2px}
.sys .badge .en{font-size:13px;letter-spacing:2px;opacity:.85;font-weight:600}
.sys .role{font-size:14px;opacity:.9;margin-bottom:18px}
.sys ul{list-style:none;margin-top:auto}
.sys ul li{font-size:14.5px;padding:7px 0;border-top:1px solid rgba(255,255,255,.16)}
.sys ul li b{font-weight:700}
.sys .goto{margin-top:18px;font-size:13.5px;font-weight:700;opacity:.95}

/* ---------- Product system detail (Tab + sub-series) ---------- */
.products{background:var(--bg-soft)}
.sys-tabs{display:flex;justify-content:center;gap:12px;flex-wrap:wrap;margin-bottom:14px}
.sys-tab{padding:11px 26px;border-radius:50px;border:1.5px solid var(--line);background:#fff;color:var(--ink-2);font-size:15px;font-weight:700;cursor:pointer;transition:.25s;display:flex;align-items:center;gap:8px}
.sys-tab .en{font-size:11px;opacity:.7;font-weight:600}
.sys-tab.active,.sys-tab:hover{color:#fff;border-color:transparent}
.sys-tab.active[data-s="yunsong"],.sys-tab:hover[data-s="yunsong"]{background:linear-gradient(120deg,#1457B8,#0A1F3C)}
.sys-tab.active[data-s="yunzhi"],.sys-tab:hover[data-s="yunzhi"]{background:linear-gradient(120deg,#21C7E0,#0d3a6b)}
.sys-tab.active[data-s="yunban"],.sys-tab:hover[data-s="yunban"]{background:linear-gradient(120deg,#a14bd6,#5a2a8a)}
.sys-panel{display:none}
.sys-panel.active{display:block;animation:fade .4s ease}
@keyframes fade{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
.sys-head{display:flex;flex-wrap:wrap;gap:24px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px 28px;margin-bottom:24px;align-items:center}
.sys-head .logo2{font-size:26px;font-weight:800;color:var(--navy);letter-spacing:1px;white-space:nowrap}
.sys-head .logo2 i{font-style:normal;color:var(--blue)}
.sys-head .meta{display:flex;gap:30px;flex-wrap:wrap;flex:1}
.sys-head .meta div b{display:block;font-size:13px;color:var(--ink-2);font-weight:600;margin-bottom:2px}
.sys-head .meta div span{font-size:14.5px;color:var(--navy);font-weight:600}
.ss-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.ss{background:#fff;border-radius:var(--radius);padding:26px 24px;border:1px solid var(--line);position:relative;overflow:hidden;transition:.3s}
.ss:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.ss .tagname{display:inline-block;font-size:12px;font-weight:700;padding:4px 12px;border-radius:50px;margin-bottom:12px}
.ss.c1 .tagname{background:#e8f0ff;color:var(--blue)}
.ss.c2 .tagname{background:#e2f7fb;color:#0d6e80}
.ss.c3 .tagname{background:#f3e8fb;color:#7a2db0}
.ss h3{font-size:18px;color:var(--navy);margin-bottom:4px}
.ss .en{font-size:12px;color:var(--ink-2);letter-spacing:1px;margin-bottom:14px}
.ss .blk{margin-bottom:12px}
.ss .blk b{font-size:12.5px;color:var(--blue);font-weight:700;display:block;margin-bottom:4px;letter-spacing:.5px}
.ss .blk p{font-size:13.5px;color:var(--ink-2);line-height:1.6}
.dot{display:inline-block;width:7px;height:7px;border-radius:50%;margin-right:6px;vertical-align:middle}
.dot.on{background:#1c8a4f}.dot.soon{background:var(--amber)}

/* ---------- Features / capabilities ---------- */
.features{background:var(--white)}
.feat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.feat{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px;transition:.3s}
.feat:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:transparent}
.feat .ic{width:54px;height:54px;border-radius:14px;background:linear-gradient(135deg,var(--blue),var(--cyan));display:grid;place-items:center;margin-bottom:18px}
.feat .ic svg{width:28px;height:28px;stroke:#fff}
.feat h3{font-size:18px;color:var(--navy);margin-bottom:8px}
.feat p{font-size:14.5px;color:var(--ink-2)}

/* ---------- Markets ---------- */
.markets{background:var(--bg-soft)}
.mkt-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.mkt{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px;transition:.3s}
.mkt:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.mkt .ic{width:48px;height:48px;border-radius:12px;display:grid;place-items:center;margin-bottom:14px}
.mkt.c1 .ic{background:#e8f0ff}.mkt.c2 .ic{background:#e2f7fb}.mkt.c3 .ic{background:#f3e8fb}.mkt.c4 .ic{background:#fff0e6}
.mkt .ic svg{width:26px;height:26px;stroke:var(--blue)}
.mkt h3{font-size:17px;color:var(--navy);margin-bottom:6px}
.mkt p{font-size:13.5px;color:var(--ink-2)}
.mkt .prod{margin-top:12px;font-size:13px;font-weight:700;color:var(--blue)}

/* ---------- Solutions ---------- */
.solutions{background:var(--white)}
.sol-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.sol{position:relative;border-radius:var(--radius);overflow:hidden;min-height:280px;display:flex;align-items:flex-end;padding:28px;color:#fff;background:var(--navy)}
.sol .ov{position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,31,60,0) 30%,rgba(10,31,60,.92));}
.sol .bg{position:absolute;inset:0;opacity:.9}
.sol .c{position:relative;z-index:2}
.sol h3{font-size:21px;margin-bottom:8px}
.sol p{font-size:14px;color:rgba(255,255,255,.85)}
.sol .num{position:absolute;top:20px;right:24px;font-size:46px;font-weight:800;color:rgba(255,255,255,.14);z-index:2}

/* ---------- Synergy ---------- */
.synergy{background:linear-gradient(150deg,var(--navy),var(--blue));color:#fff}
.synergy .section-head h2{color:#fff}
.synergy .section-head p{color:rgba(255,255,255,.78)}
.syn-flow{display:flex;align-items:stretch;justify-content:center;gap:0;flex-wrap:wrap}
.syn-node{flex:1;min-width:160px;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.15);border-radius:14px;padding:20px;text-align:center}
.syn-node b{font-size:18px;display:block;margin-bottom:6px}
.syn-node b i{font-style:normal;color:var(--cyan)}
.syn-node span{font-size:13px;color:rgba(255,255,255,.8)}
.syn-arrow{display:grid;place-items:center;color:var(--cyan);font-size:26px;padding:0 10px;font-weight:800}
.syn-cap{text-align:center;margin-top:26px;font-size:15px;color:rgba(255,255,255,.85);max-width:760px;margin-left:auto;margin-right:auto}

/* ---------- Cases ---------- */
.cases{background:var(--bg-soft)}
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.case{background:#fff;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);transition:.3s}
.case:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.case .thumb{height:170px;background:linear-gradient(135deg,var(--navy),var(--blue));position:relative;display:grid;place-items:center;color:rgba(255,255,255,.85)}
.case .thumb svg{width:54px;height:54px;stroke:rgba(255,255,255,.7)}
.case .thumb .badge{position:absolute;top:14px;left:14px;background:var(--amber);color:#fff;font-size:12px;font-weight:700;padding:5px 12px;border-radius:50px}
.case .body{padding:20px 22px}
.case .body h3{font-size:16.5px;color:var(--navy);margin-bottom:6px}
.case .body p{font-size:13.5px;color:var(--ink-2)}

/* ---------- About ---------- */
.about{background:var(--white)}
.about-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:54px;align-items:center}
.about h2{font-size:clamp(24px,3vw,34px);color:var(--navy);margin-bottom:18px;line-height:1.3}
.about p{color:var(--ink-2);margin-bottom:16px;font-size:15.5px}
.about .vals{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
.about .vals span{background:var(--bg-soft);border:1px solid var(--line);color:var(--blue);padding:9px 16px;border-radius:50px;font-size:13.5px;font-weight:600}
.about .panel{background:linear-gradient(150deg,var(--navy),var(--blue));border-radius:22px;padding:36px;color:#fff;box-shadow:var(--shadow-lg)}
.about .panel h3{font-size:18px;margin-bottom:22px;color:#fff;letter-spacing:1px}
.timeline{position:relative;padding-left:22px}
.timeline::before{content:"";position:absolute;left:6px;top:4px;bottom:4px;width:2px;background:rgba(255,255,255,.25)}
.timeline .it{position:relative;margin-bottom:18px}
.timeline .it::before{content:"";position:absolute;left:-19px;top:5px;width:11px;height:11px;border-radius:50%;background:var(--cyan)}
.timeline .it b{font-size:14px;display:block}
.timeline .it span{font-size:13px;color:rgba(255,255,255,.78)}

/* ---------- News ---------- */
.news{background:var(--bg-soft)}
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.news-card{background:#fff;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);transition:.3s;display:flex;flex-direction:column}
.news-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.news-card .top{background:linear-gradient(135deg,var(--blue),var(--cyan));height:9px}
.news-card .body{padding:22px 24px;flex:1;display:flex;flex-direction:column}
.news-card .date{font-size:12.5px;color:var(--blue);font-weight:700;letter-spacing:1px}
.news-card h3{font-size:17px;color:var(--navy);margin:10px 0 10px;line-height:1.4}
.news-card p{font-size:13.5px;color:var(--ink-2);flex:1}
.news-card .lk{margin-top:16px;font-size:13.5px;font-weight:700;color:var(--blue)}

/* ---------- Contact ---------- */
.contact{background:var(--navy);color:#fff}
.contact .section-head h2{color:#fff}
.contact .section-head p{color:rgba(255,255,255,.75)}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.info-card{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:var(--radius);padding:32px}
.info-card h3{font-size:18px;margin-bottom:20px;letter-spacing:1px}
.info-row{display:flex;gap:14px;align-items:flex-start;margin-bottom:18px}
.info-row .ic{width:42px;height:42px;border-radius:11px;background:rgba(33,199,224,.2);display:grid;place-items:center;flex:none}
.info-row .ic svg{width:22px;height:22px;stroke:var(--cyan)}
.info-row .t b{display:block;font-size:14px;color:rgba(255,255,255,.7);font-weight:500;margin-bottom:2px}
.info-row .t span{font-size:15.5px;font-weight:600}
.form{background:#fff;border-radius:var(--radius);padding:32px;color:var(--ink)}
.form h3{font-size:18px;color:var(--navy);margin-bottom:20px}
.field{margin-bottom:16px}
.field label{display:block;font-size:13.5px;color:var(--ink-2);margin-bottom:7px;font-weight:600}
.field input,.field textarea{width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:10px;font-family:inherit;font-size:14.5px;color:var(--ink);transition:.2s;background:var(--bg)}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--blue);background:#fff}
.field textarea{resize:vertical;min-height:96px}
.form .btn{width:100%;justify-content:center}
.form .ok{display:none;background:#e7f8ee;color:#1c8a4f;border:1px solid #b7e6c9;padding:12px 14px;border-radius:10px;font-size:14px;margin-top:14px}
.form .ok.show{display:block}

/* ---------- Footer ---------- */
.footer{background:#061427;color:rgba(255,255,255,.7);padding:54px 0 26px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:36px}
.footer .logo{margin-bottom:0}
.footer .logo-img{height:52px;background:#fff;padding:8px 14px;border-radius:10px;box-shadow:0 4px 14px rgba(0,0,0,.12);margin-bottom:14px}
.footer p{font-size:14px;line-height:1.8}
.footer h4{color:#fff;font-size:15px;margin-bottom:16px;letter-spacing:1px}
.footer ul{list-style:none}
.footer ul li{margin-bottom:10px}
.footer ul li a{font-size:14px;color:rgba(255,255,255,.7);transition:.2s}
.footer ul li a:hover{color:var(--cyan)}
.foot-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:40px;padding-top:22px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:13px}
.foot-bottom a{color:rgba(255,255,255,.7)}

/* ---------- Reveal / toTop ---------- */
.reveal{opacity:0;transform:translateY(28px);transition:.7s cubic-bezier(.2,.7,.3,1)}
.reveal.in{opacity:1;transform:none}
#toTop{position:fixed;right:24px;bottom:24px;width:46px;height:46px;border-radius:50%;background:linear-gradient(135deg,var(--blue),var(--cyan));display:grid;place-items:center;cursor:pointer;opacity:0;visibility:hidden;transition:.3s;z-index:40;box-shadow:var(--shadow)}
#toTop.show{opacity:1;visibility:visible}
#toTop svg{width:22px;height:22px;stroke:#fff}

/* ---------- Mobile ---------- */
@media(max-width:980px){
  .nav{position:fixed;top:74px;right:0;height:calc(100vh - 74px);width:min(80vw,320px);background:#fff;flex-direction:column;align-items:flex-start;gap:0;padding:18px 22px;transform:translateX(110%);transition:.35s;box-shadow:-10px 0 40px rgba(16,42,82,.18);overflow-y:auto}
  .nav.open{transform:none}
  .nav a{color:var(--ink)!important;width:100%;padding:14px 4px;border-bottom:1px solid var(--line);font-size:16px}
  .nav a::after{display:none}
  .hamburger{display:flex}
  .header .phone{display:none}
  .hero .wrap{flex-direction:column;align-items:flex-start;gap:30px}
  .hero-visual{display:none}
  .sys-grid,.feat-grid,.ss-grid,.mkt-grid,.sol-grid,.case-grid,.news-grid{grid-template-columns:1fr 1fr}
  .about-grid,.contact-grid{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  .syn-flow{flex-direction:column}
  .syn-arrow{transform:rotate(90deg);padding:6px 0}
}
@media(max-width:980px){
  .logo-img{height:40px}
  .header.transparent .logo-img{padding:4px 9px}
}
@media(max-width:560px){
  .logo-img{height:34px;max-width:170px}
  .footer .logo-img{height:46px;padding:7px 12px}
  .section{padding:62px 0}
  .sys-grid,.ss-grid,.feat-grid,.mkt-grid,.sol-grid,.case-grid,.news-grid{grid-template-columns:1fr}
  .hero .stats{gap:24px}
  .hero .stat b{font-size:24px}
  .foot-grid{grid-template-columns:1fr}
  .sys-head{flex-direction:column;align-items:flex-start}
}

/* ---------- 首页 Hero 背景图 ---------- */
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;opacity:.45;z-index:0}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(120deg,rgba(10,31,60,.82),rgba(7,21,43,.6));z-index:1}
.hero .wrap{position:relative;z-index:2}

/* ---------- 三大体系总览卡·背景图 ---------- */
.sys .bgimg{position:absolute;inset:0;background-size:cover;background-position:center;opacity:.22;z-index:0}
.sys>*{position:relative;z-index:1}

/* ---------- 子页通用 ---------- */
body.subpage{background:#fff}
.subpage .header{background:rgba(255,255,255,.94);backdrop-filter:blur(10px);box-shadow:0 4px 20px rgba(16,42,82,.08)}
.subpage .header .logo{color:var(--navy)}
.subpage .nav a{color:var(--ink-2)}
.subpage .nav a.active{color:var(--blue)}
.subpage .nav a.active::after{width:100%}
.subpage .hamburger span{background:var(--navy)}

/* 子页 banner */
.subhero{position:relative;padding:140px 0 70px;color:#fff;overflow:hidden;background:radial-gradient(120% 120% at 80% 0%,#16386e,#0A1F3C)}
.subhero .bg{position:absolute;inset:0;background-size:cover;background-position:center;opacity:.42}
.subhero::after{content:"";position:absolute;inset:0;background:linear-gradient(120deg,rgba(10,31,60,.8),rgba(7,21,43,.55))}
.subhero .wrap{position:relative;z-index:2}
.breadcrumb{font-size:13px;color:rgba(255,255,255,.7);margin-bottom:16px}
.breadcrumb a{color:rgba(255,255,255,.82)}
.breadcrumb a:hover{color:var(--cyan)}
.subhero h1{font-size:clamp(28px,4vw,46px);font-weight:800;letter-spacing:1px}
.subhero .lead{margin-top:16px;font-size:17px;max-width:680px;color:rgba(255,255,255,.85)}
.subhero .pill{display:inline-block;margin-top:18px;background:rgba(33,199,224,.16);border:1px solid rgba(33,199,224,.4);color:var(--cyan);padding:7px 16px;border-radius:50px;font-size:13px;font-weight:600}

/* 子系列卡片 + 产品图占位 */
.prod-img{position:relative;height:160px;border-radius:12px;margin-bottom:16px;background:linear-gradient(135deg,#e8f0ff,#dfeeff);display:grid;place-items:center;overflow:hidden;border:1px dashed var(--line)}
.prod-img .ph{font-size:12.5px;color:var(--ink-2);text-align:center;padding:0 14px}
.prod-img .tag{position:absolute;bottom:8px;right:8px;background:rgba(10,31,60,.72);color:#fff;font-size:11px;padding:3px 9px;border-radius:50px}
.ss .prod-img{background:linear-gradient(135deg,#eef4fb,#e6eefb)}

/* 子页案例图标注 */
.case .thumb .note{position:absolute;bottom:10px;right:10px;background:rgba(10,31,60,.6);color:#fff;font-size:11px;padding:3px 8px;border-radius:50px}

/* 子页 CTA */
.subcta{background:linear-gradient(120deg,var(--navy),var(--blue));color:#fff;text-align:center;padding:64px 0}
.subcta h2{color:#fff;font-size:clamp(22px,3vw,32px);margin-bottom:14px}
.subcta p{color:rgba(255,255,255,.8);margin-bottom:24px}

@media(max-width:560px){
  .subhero{padding:120px 0 54px}
}