:root{
  --navy:#14283c;          /* 墨蓝主色（无渐变） */
  --navy-2:#0f1f30;
  --ink:#1b2530;           /* 近黑墨色正文 */
  --muted:#5c6675;         /* 次要文字（AA 对比） */
  --paper:#fbfaf7;         /* 暖白纸底，比纯白更有质感 */
  --paper-2:#f3f1ea;       /* 暖浅灰区块 */
  --line:#e4e0d6;          /* 暖灰细线 */
  --line-strong:#d8d3c7;
  --accent:#0f5d72;        /* 唯一强调色：深青蓝纯色 */
  --accent-soft:#e9f0f2;
  --serif:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --maxw:1120px;
  --shadow:0 1px 2px rgba(20,40,60,.05),0 10px 28px rgba(20,40,60,.06);
  --accent-bright:#39c6dc;   /* 深色背景上的亮青，用于科技感高亮 */
  --grid:rgba(255,255,255,.05); /* 工程网格纹理 */
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  color:var(--ink);background:var(--paper);line-height:1.8;font-size:16px;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
a{color:inherit;text-decoration:none}
section[id]{scroll-margin-top:78px}
img,svg{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 26px;border-radius:9px;font-weight:600;font-size:15px;cursor:pointer;border:1px solid transparent;transition:background .2s,color .2s,border-color .2s}
.btn-primary{background:var(--navy);color:#fff}
.btn-primary:hover{background:var(--navy-2)}
.btn-accent{background:var(--accent);color:#fff}
.btn-accent:hover{background:#0c4a5b}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line-strong)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}
.btn:active{transform:translateY(1px)}
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,.btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:6px}
.nav-links a:focus-visible{outline-offset:4px}

/* 编辑式小标签：短横线 + 字距，替代 AI 胶囊 */
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:12.5px;font-weight:500;
  letter-spacing:2px;color:var(--accent);text-transform:uppercase}
.eyebrow::before{content:"";width:26px;height:1.5px;background:var(--accent);display:inline-block}

.section{padding:100px 0}
.section-head{max-width:720px;margin-bottom:54px}
.section-head h2{font-family:var(--serif);font-size:clamp(26px,3.4vw,34px);font-weight:800;color:var(--navy);
  letter-spacing:-.3px;line-height:1.24;margin-top:16px}
.section-head p{color:var(--muted);margin-top:14px;font-size:16px}
.center{text-align:center}
.center .section-head{margin-left:auto;margin-right:auto}

/* skip link */
.skip-link{position:absolute;left:-999px;top:0;background:var(--navy);color:#fff;padding:10px 16px;border-radius:0 0 10px 0;z-index:200;font-size:14px;font-weight:600}
.skip-link:focus{left:0;top:0}

/* NAV */
header.nav{position:sticky;top:0;z-index:50;background:var(--paper);border-bottom:1px solid var(--line);transition:.3s}
header.nav.scrolled{box-shadow:0 2px 10px rgba(20,40,60,.05)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--navy);font-size:17px;letter-spacing:.5px}
.brand .logo{width:32px;height:32px;border-radius:7px;background:var(--navy);color:#fff;display:grid;place-items:center;font-family:var(--serif);font-size:15px;font-weight:700;flex:none}
.nav-links{display:flex;align-items:center;gap:24px}
.nav-links a{font-size:15px;font-weight:500;color:var(--ink);transition:color .2s;position:relative;padding:4px 0}
.nav-links a:hover{color:var(--accent)}
.nav-links a.active{color:var(--accent)}
.nav-cta{display:flex;align-items:center;gap:14px}
.nav-cta .phone{font-size:14px;font-weight:700;color:var(--navy)}
.hamburger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.hamburger span{width:22px;height:2px;background:var(--navy);border-radius:2px}
/* 下拉导航 */
.nav-links .dropdown{position:relative}
.nav-links .drop-label{font-size:15px;font-weight:500;color:var(--ink);cursor:default;white-space:nowrap}
.nav-links .drop-label::after{content:" ▾";font-size:10px;color:var(--muted)}
.nav-links .dropdown-menu{position:absolute;top:calc(100% + 10px);left:50%;transform:translateX(-50%);background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:0 8px 30px rgba(20,40,60,.12);min-width:180px;padding:8px 0;display:none;flex-direction:column;z-index:100}
.nav-links .dropdown:hover .dropdown-menu,.nav-links .dropdown:focus-within .dropdown-menu{display:flex}
.nav-links .dropdown-menu a{padding:10px 20px;font-size:14.5px;white-space:nowrap;border-bottom:0}
.nav-links .dropdown-menu a:hover{background:var(--paper-2);color:var(--accent)}
.nav-links .dropdown-menu a.active{color:var(--accent);font-weight:700}
/* 下拉小三角 */
.nav-links .dropdown-menu::before{content:"";position:absolute;top:-6px;left:50%;transform:translateX(-50%) rotate(45deg);width:10px;height:10px;background:#fff;border-left:1px solid var(--line);border-top:1px solid var(--line)}

/* HERO */
.hero{position:relative;background:var(--paper);border-bottom:1px solid var(--line)}
.hero-inner{display:grid;grid-template-columns:1.05fr .95fr;gap:60px;align-items:center;padding:96px 0}
.hero h1{font-family:var(--serif);font-size:clamp(36px,5vw,54px);line-height:1.12;font-weight:800;color:var(--navy);letter-spacing:-.5px}
.hero h1 .hl{color:var(--accent)}
.hero p.lead{color:var(--muted);font-size:17px;margin-top:24px;max-width:540px}
.hero .actions{margin-top:34px;display:flex;gap:14px;flex-wrap:wrap}
.hero .facts{margin-top:40px;display:flex;gap:0;flex-wrap:wrap;border-top:1px solid var(--line)}
.hero .facts .fact{flex:1;min-width:140px;padding:20px 22px 0;border-right:1px solid var(--line)}
.hero .facts .fact:last-child{border-right:0}
.hero .facts b{color:var(--navy);font-family:var(--serif);font-weight:800;font-size:30px;display:block;line-height:1.15;letter-spacing:-.3px}
.hero .facts span{color:var(--muted);font-size:13px}
.hero-visual{background:#fff;border:1px solid var(--line);border-radius:10px;padding:30px;box-shadow:var(--shadow)}
.hero-visual h4{font-size:13px;color:var(--muted);font-weight:700;margin-bottom:20px;letter-spacing:1px}
.layer{border-top:1px solid var(--line);padding:15px 0;display:flex;align-items:center;gap:14px}
.layer:first-of-type{border-top:0;padding-top:0}
.layer .dot{width:7px;height:7px;border-radius:1px;background:var(--accent);flex:none}
.layer .lt{font-weight:700;color:var(--navy);font-size:15px}
.layer .ld{color:var(--muted);font-size:13px;margin-left:auto;text-align:right}

/* 方案页深色 HERO：扁平原色 + 1px 工程网格，去除一切发光/光晕 */
.hero--dark{position:relative;background:var(--navy-2);color:#dde6f0;border-bottom:1px solid rgba(255,255,255,.10);overflow:hidden}
.hero--dark::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.06) 1px,transparent 1px);background-size:40px 40px;pointer-events:none}
.hero--dark .hero-inner{position:relative;z-index:1}
.hero--dark h1{color:#fff}
.hero--dark h1 .hl{color:var(--accent-bright)}
.hero--dark .eyebrow{color:var(--accent-bright);font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;letter-spacing:2px;font-size:12px}
.hero--dark .eyebrow::before{background:var(--accent-bright);height:1px}
.hero--dark p.lead{color:#a9b8c9}
.hero--dark .facts{border-color:rgba(255,255,255,.14)}
.hero--dark .facts .fact{border-right-color:rgba(255,255,255,.12);padding-top:22px}
.hero--dark .facts b{color:var(--accent-bright);font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:32px}
.hero--dark .facts span{color:#94a6b8;font-size:12.5px}
.hero--dark .hero-visual{background:rgba(10,22,34,.5);border:1px solid rgba(255,255,255,.16);padding:30px}
.hero--dark .hero-visual h4{color:#fff;display:flex;align-items:center;gap:10px;font-size:13px;letter-spacing:1px}
.hero--dark .hero-visual h4::before{content:"";width:7px;height:7px;border-radius:1px;background:var(--accent-bright)}
.hero--dark .layer{border-top-color:rgba(255,255,255,.12)}
.hero--dark .layer .dot{background:var(--accent-bright);width:6px;height:6px;border-radius:1px}
.hero--dark .layer .lt{color:#e6edf4;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:14px}
.hero--dark .layer .ld{color:#94a6b8}
.hero--dark .btn-ghost{color:#cdd9e6;border-color:rgba(255,255,255,.28)}
.hero--dark .btn-ghost:hover{border-color:var(--accent-bright);color:var(--accent-bright)}
.hero--dark .btn-primary{background:var(--accent-bright);color:#06222b;border-color:var(--accent-bright)}
.hero--dark .btn-primary:hover{background:#5fd6e8}
/* 能力标签：扁平描边 chip，无发光 */
.tech-badge{display:inline-flex;align-items:center;gap:8px;padding:6px 12px;border-radius:6px;border:1px solid rgba(255,255,255,.20);background:rgba(255,255,255,.04);color:#cdd9e6;font-size:12.5px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
.tech-badge::before{content:"";width:5px;height:5px;border-radius:1px;background:var(--accent-bright)}

/* TRUST */
.trust{border-bottom:1px solid var(--line);background:#fff}
.trust-inner{display:flex;align-items:center;gap:14px;flex-wrap:wrap;padding:22px 0;color:var(--muted);font-size:14px}
.trust-inner .lbl{font-weight:600;color:var(--navy)}
.trust-inner .sep{color:var(--line-strong)}
.trust-inner strong{color:var(--ink);font-weight:700}
.trust-inner a:hover{color:var(--accent)}

/* ABOUT-CARD 风格的事实卡（子页复用） */
.about-card{background:var(--navy);color:#dbe6f1;border-radius:10px;padding:36px;border:1px solid rgba(255,255,255,.14);position:relative;overflow:hidden}
.about-card h3{color:#fff;font-size:19px;margin-bottom:6px;font-weight:700}
.about-card p{color:#9fb4ca;font-size:14px;margin-bottom:22px}
.about-card .row{display:flex;justify-content:space-between;gap:16px;padding:13px 0;border-bottom:1px solid rgba(255,255,255,.12);font-size:14px}
.about-card .row:last-child{border-bottom:0}
.about-card .row .v{color:#fff;font-weight:600;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;text-align:right}

/* CAPS */
.caps{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:10px;overflow:hidden}
.cap{background:#fff;padding:32px 28px;transition:background .2s,box-shadow .2s,border-color .2s,transform .2s;position:relative;overflow:hidden}
.cap::before{content:"";position:absolute;top:0;left:0;right:0;height:2px;background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform .25s}
.cap:hover::before{transform:scaleX(1)}
.cap:hover{box-shadow:0 10px 28px rgba(20,40,60,.10);border-color:var(--accent);transform:translateY(-2px)}
.cap .ch{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:12.5px;font-weight:600;color:var(--accent);letter-spacing:1.5px;background:var(--accent-soft);width:28px;height:28px;display:grid;place-items:center;border-radius:6px}
.cap h3{font-size:18px;color:var(--navy);font-weight:700;margin-top:16px}
.cap p{color:var(--muted);font-size:14.5px;margin-top:10px}
.cap .tags{margin-top:18px;display:flex;flex-wrap:wrap;gap:7px}
.cap .tags span{font-size:12px;color:var(--muted);background:var(--paper-2);padding:4px 10px;border-radius:6px}

/* CASES（子页用于"成效"模块） */
.cases{background:var(--paper-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.case-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.case{background:#fff;border:1px solid var(--line);border-radius:10px;display:flex;flex-direction:column;transition:border-color .2s}
.case:hover{border-color:var(--line-strong)}
.case .top{background:var(--paper-2);border-bottom:1px solid var(--line);padding:18px 24px;display:flex;align-items:center;justify-content:space-between}
.case .top .name{font-size:17px;font-weight:700;color:var(--navy)}
.case .top .kind{font-size:12px;color:var(--accent);font-weight:600}
.case .body{padding:22px 24px;display:flex;flex-direction:column;flex:1}
.case .body .desc{color:var(--muted);font-size:14.5px;flex:1}
.case .tech{margin-top:16px;display:flex;flex-wrap:wrap;gap:7px}
.case .tech span{font-size:12px;color:var(--accent);background:var(--accent-soft);padding:4px 10px;border-radius:6px;font-weight:600}

/* 痛点列表（子页复用） */
.pain{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.pain .item{background:#fff;border:1px solid var(--line);border-radius:10px;padding:26px 28px;transition:border-color .2s,box-shadow .2s,transform .2s}
.pain .item:hover{border-color:var(--accent);box-shadow:0 10px 28px rgba(20,40,60,.08);transform:translateY(-2px)}
.pain .item .n{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:24px;font-weight:500;color:var(--accent);display:block;line-height:1;margin-bottom:10px}
.pain .item h4{color:var(--navy);font-size:16px;font-weight:700;margin-bottom:8px}
.pain .item p{color:var(--muted);font-size:14.5px}

/* PROCESS */
.proc{display:grid;grid-template-columns:repeat(5,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:10px;overflow:hidden}
.step{background:#fff;padding:28px 20px;position:relative;transition:background .2s}
.step:hover{background:var(--paper-2)}
.step .badge{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:34px;font-weight:500;color:var(--accent);line-height:1;margin-bottom:12px}
.step h4{color:var(--navy);font-size:16px;font-weight:700}
.step p{color:var(--muted);font-size:13.5px;margin-top:6px}

/* CTA BAND */
.cta-band{background:linear-gradient(135deg,var(--navy) 0%,#0f1c2c 100%);color:#fff;position:relative;overflow:hidden}
.cta-band::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);background-size:48px 48px;pointer-events:none}
.cta-inner{position:relative;display:flex;align-items:center;justify-content:space-between;gap:32px;padding:64px 0;flex-wrap:wrap}
.cta-inner h2{font-family:var(--serif);font-size:clamp(24px,3vw,30px);font-weight:800;color:#fff;line-height:1.28;letter-spacing:-.3px}
.cta-inner p{color:#a9c0d6;margin-top:10px;font-size:15px}
.cta-band .btn-cta{background:#fff;color:var(--navy);font-weight:700}
.cta-band .btn-cta:hover{background:#eef3f6}

/* CONTACT */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:52px;align-items:start}
.ci{display:flex;gap:14px;align-items:flex-start;padding:16px 0;border-bottom:1px solid var(--line)}
.ci:last-child{border-bottom:0}
.ci .ic{width:42px;height:42px;border-radius:9px;background:var(--accent-soft);color:var(--accent);display:grid;place-items:center;flex:none;font-weight:700;font-size:16px}
.ci .t{font-size:13px;color:var(--muted)}
.ci .v{font-size:17px;font-weight:700;color:var(--navy)}
.ci .v a:hover{color:var(--accent)}

/* FOOTER */
footer{background:var(--navy);color:#c7d6e6;padding:54px 0 30px}
footer .fbrand{color:#fff;font-weight:700;font-size:18px;display:flex;align-items:center;gap:10px;justify-content:center;letter-spacing:.5px}
footer .fbrand .logo{width:30px;height:30px;border-radius:7px;background:#fff;color:var(--navy);display:grid;place-items:center;font-family:var(--serif);font-size:14px;font-weight:700}
footer .fslogan{color:#8fa8c0;font-size:14px;margin-top:10px;text-align:center}
footer .fnav{margin:24px 0;display:flex;gap:26px;justify-content:center;flex-wrap:wrap}
footer .fnav a{color:#9fb4ca;font-size:14px;transition:color .2s}
footer .fnav a:hover{color:#fff}
footer .fcontact{color:#9fb4ca;font-size:14px;margin-bottom:18px;text-align:center}
footer .fcontact a{color:#9fb4ca}
footer .fcontact a:hover{color:#fff}
footer .flinks{font-size:14px;color:#9fb4ca;margin-bottom:18px;text-align:center}
footer .flinks .flbl{color:#8fa8c0;margin-right:6px}
footer .flinks a{color:#9fb4ca}
footer .flinks a:hover{color:#fff}
.foot-bottom{border-top:1px solid rgba(255,255,255,.12);padding-top:20px;color:#8fa8c0;font-size:13px;line-height:1.9;text-align:center}
.foot-bottom a{color:#8fa8c0}
.foot-bottom a:hover{color:#fff}
.foot-bottom .icp{margin-top:4px}

/* FAQ（子页 GEO 问答） */
.faq{background:var(--paper-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.faq-list{max-width:880px;margin:0 auto;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#fff}
.faq-list details{border-bottom:1px solid var(--line)}
.faq-list details:last-child{border-bottom:0}
.faq-list summary{display:flex;align-items:center;gap:14px;padding:20px 24px;cursor:pointer;font-weight:700;color:var(--navy);font-size:16px;list-style:none}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary .q{color:var(--accent);font-family:var(--serif);font-weight:800;flex:none}
.faq-list summary .plus{margin-left:auto;color:var(--muted);font-size:22px;transition:transform .2s}
.faq-list details[open] summary .plus{transform:rotate(45deg)}
.faq-list .a{padding:0 24px 22px;color:var(--muted);font-size:15px}

/* 文档式公示页（安全评估等合规页面） */
.doc-head{padding:84px 0 52px;border-bottom:1px solid var(--line);background:#fff}
.doc-head .lead{color:var(--muted);font-size:16px;max-width:760px;margin-top:18px;line-height:1.85}
.doc-head .meta{display:flex;flex-wrap:wrap;gap:36px;margin-top:30px;padding-top:24px;border-top:1px solid var(--line)}
.doc-head .meta .m .k{font-size:12.5px;color:var(--muted);letter-spacing:.5px}
.doc-head .meta .m .v{font-size:15px;font-weight:600;color:var(--navy);margin-top:5px}
.doc-body{padding:60px 0 84px}
.doc-grid{display:grid;grid-template-columns:232px 1fr;gap:56px;align-items:start}
.doc-toc{position:sticky;top:96px}
.doc-toc .toc-title{font-size:12px;letter-spacing:2px;text-transform:uppercase;color:var(--muted);font-weight:600;margin-bottom:14px}
.doc-toc a{display:block;padding:9px 0 9px 14px;font-size:14.5px;color:var(--muted);border-left:2px solid transparent;transition:color .2s,border-color .2s}
.doc-toc a:hover,.doc-toc a.active{color:var(--accent);border-left-color:var(--accent)}
.doc-content section{margin-bottom:54px;scroll-margin-top:90px}
.doc-content h2{font-size:23px;font-weight:800;color:var(--navy);letter-spacing:-.2px;padding-bottom:14px;border-bottom:2px solid var(--navy);margin-bottom:22px}
.doc-content h3{font-size:17px;font-weight:700;color:var(--navy);margin-bottom:8px;margin-top:2px}
.doc-content p{color:var(--muted);font-size:15px;line-height:1.9}
.doc-def{margin-top:6px}
.doc-def .row{display:flex;gap:24px;padding:14px 0;border-bottom:1px solid var(--line)}
.doc-def .row .k{width:168px;flex:none;color:var(--muted);font-size:14.5px}
.doc-def .row .v{color:var(--ink);font-weight:600;font-size:14.5px;word-break:break-all}
.eval-item{display:flex;gap:18px;padding:22px 0;border-bottom:1px solid var(--line)}
.eval-item:last-child{border-bottom:0}
.eval-item .num{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:18px;font-weight:600;color:var(--accent);flex:none;width:30px;line-height:1.6}
.eval-item .ebody{flex:1}
.sign{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:24px;padding:28px;background:#fff;border:1px solid var(--line);border-radius:10px}
.sign .k{font-size:13px;color:var(--muted)}
.sign .v{font-weight:700;color:var(--navy);margin-top:6px}
.contact-panel{margin-top:8px;padding:28px;background:var(--paper-2);border:1px solid var(--line);border-radius:10px;display:flex;flex-wrap:wrap;gap:28px}
.contact-panel .item .k{font-size:13px;color:var(--muted)}
.contact-panel .item .v{font-weight:700;color:var(--navy);margin-top:6px;font-size:15px}
.contact-panel .item .v a:hover{color:var(--accent)}

/* reveal */
.js .reveal{opacity:0;transform:translateY(14px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}

@media(max-width:980px){
  .hero-inner{grid-template-columns:1fr;gap:40px;padding:64px 0}
  .caps{grid-template-columns:repeat(2,1fr)}
  .case-grid{grid-template-columns:1fr}
  .pain{grid-template-columns:1fr}
  .proc{grid-template-columns:repeat(2,1fr)}
  .contact-grid{grid-template-columns:1fr}
  .doc-grid{grid-template-columns:1fr;gap:30px}
  .doc-toc{position:static;display:flex;flex-wrap:wrap;gap:6px 16px;border-bottom:1px solid var(--line);padding-bottom:16px}
  .doc-toc .toc-title{width:100%}
  .doc-toc a{border-left:0;padding-left:0}
  .doc-def .row{flex-direction:column;gap:4px}
  .sign{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:680px){
  .nav-links,.nav-cta .phone{display:none}
  .hamburger{display:flex}
  .nav-links.open{display:flex;position:absolute;top:68px;left:0;right:0;background:#fff;flex-direction:column;gap:0;padding:8px 28px 18px;border-bottom:1px solid var(--line);box-shadow:var(--shadow)}
  .nav-links.open a{padding:12px 0;border-bottom:1px solid var(--line);width:100%}
  .hero h1{font-size:32px}
  .section{padding:68px 0}
  .section-head h2{font-size:26px}
  .caps{grid-template-columns:1fr}
  .proc{grid-template-columns:1fr}
  .hero .facts .fact{padding:16px 0 0;border-right:0}
}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *{transition:none!important;animation:none!important}
  .js .reveal{opacity:1;transform:none}
}

/* =====================================================
   产品页新设计系统（去 AI 模板味 · 真实 SaaS 产品页）
   ===================================================== */
.page-product{
  --bg:#0b0d10;
  --bg-soft:#11141a;
  --bg-elevated:#171b24;
  --border:rgba(255,255,255,.10);
  --border-dim:rgba(255,255,255,.06);
  --text:#e8eaed;
  --text-muted:#8e96a6;
  --text-dim:#5c6474;
  --accent:#4f8cff;
  --accent-dim:#3461c4;
  --success:#3ccf6a;
  --warning:#f2b230;
  --danger:#f2555a;
  background:var(--bg);
  color:var(--text);
}
.page-product .nav{background:rgba(11,13,16,.92);border-bottom:1px solid var(--border)}
.page-product .nav.scrolled{background:rgba(11,13,16,.98);box-shadow:0 1px 0 var(--border)}
.page-product .brand{color:var(--text)}
.page-product .logo{background:var(--text);color:var(--bg)}
.page-product .nav-links a,.page-product .nav .drop-label{color:var(--text)}
.page-product .dropdown-menu{background:var(--bg-elevated);border-color:var(--border)}
.page-product .dropdown-menu a{color:var(--text)}
.page-product .dropdown-menu a:hover{background:var(--bg-soft);color:var(--accent)}
.page-product .dropdown-menu::before{background:var(--bg-elevated);border-color:var(--border)}
.page-product .hamburger span{background:var(--text)}
.page-product .nav-links.open{background:var(--bg-elevated)}

/* Hero */
.product-hero{position:relative;background:var(--bg);border-bottom:1px solid var(--border);overflow:hidden}
.product-hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(var(--border-dim) 1px,transparent 1px),linear-gradient(90deg,var(--border-dim) 1px,transparent 1px);background-size:48px 48px;pointer-events:none}
.product-hero .wrap{position:relative;z-index:1;padding:120px 24px 110px}
.product-hero .hero-inner{display:grid;grid-template-columns:1.05fr 1fr;gap:64px;align-items:center}
.product-hero .eyebrow{display:inline-flex;align-items:center;gap:10px;color:var(--text-muted);font-size:12px;font-weight:500;letter-spacing:1.5px;text-transform:uppercase;margin-bottom:22px}
.product-hero .eyebrow::before{content:"";width:22px;height:1px;background:var(--accent)}
.product-hero h1{font-family:var(--sans);font-size:clamp(34px,4.2vw,54px);font-weight:800;line-height:1.12;letter-spacing:-1.2px;color:#fff;margin:0}
.product-hero h1 em{font-style:normal;color:var(--accent)}
.product-hero .lead{font-size:17px;line-height:1.75;color:var(--text-muted);margin-top:24px;max-width:540px}
.product-hero .actions{margin-top:34px;display:flex;gap:14px;flex-wrap:wrap}
.product-hero .btn-primary{background:var(--accent);color:#fff;border-color:var(--accent);font-weight:600}
.product-hero .btn-primary:hover{background:var(--accent-dim);border-color:var(--accent-dim)}
.product-hero .btn-ghost{color:var(--text);border-color:var(--border);background:transparent}
.product-hero .btn-ghost:hover{border-color:var(--accent);color:var(--accent);background:rgba(79,140,255,.06)}

/* 产品界面 mockup */
.ui-mockup{background:var(--bg-elevated);border:1px solid var(--border);border-radius:14px;box-shadow:0 28px 80px rgba(0,0,0,.55),0 0 0 1px rgba(255,255,255,.03) inset;overflow:hidden;font-size:13px;color:var(--text-muted)}
.ui-mockup .winbar{display:flex;align-items:center;gap:8px;padding:12px 16px;border-bottom:1px solid var(--border);background:rgba(255,255,255,.02)}
.ui-mockup .winbar .dot{width:10px;height:10px;border-radius:50%}
.ui-mockup .winbar .dot.r{background:var(--danger)}
.ui-mockup .winbar .dot.y{background:var(--warning)}
.ui-mockup .winbar .dot.g{background:var(--success)}
.ui-mockup .winbar .title{margin-left:6px;font-size:12px;color:var(--text-dim)}

/* 园区 Dashboard mockup */
.dash-mock{display:grid;grid-template-columns:54px 1fr 220px;min-height:380px}
.dash-mock .sidebar{display:flex;flex-direction:column;align-items:center;gap:18px;padding:18px 0;border-right:1px solid var(--border);background:rgba(255,255,255,.02)}
.dash-mock .sidebar .ico{width:22px;height:22px;border-radius:5px;background:var(--border)}
.dash-mock .sidebar .ico.active{background:var(--accent)}
.dash-mock .main{padding:20px;display:flex;flex-direction:column;gap:16px}
.dash-mock .metric-row{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.dash-mock .metric{background:var(--bg-soft);border:1px solid var(--border);border-radius:10px;padding:14px}
.dash-mock .metric .label{font-size:11px;color:var(--text-dim);margin-bottom:6px}
.dash-mock .metric .value{font-size:20px;font-weight:700;color:#fff;letter-spacing:-.3px}
.dash-mock .metric .value.up{color:var(--success)}
.dash-mock .metric .value.down{color:var(--danger)}
.dash-mock .panel{flex:1;background:var(--bg-soft);border:1px solid var(--border);border-radius:10px;padding:14px}
.dash-mock .panel .ph{height:8px;background:var(--border);border-radius:4px;margin-bottom:10px}
.dash-mock .panel .bars{display:flex;align-items:flex-end;gap:6px;height:80px;padding-top:10px}
.dash-mock .panel .bars span{flex:1;background:var(--accent);border-radius:3px 3px 0 0;opacity:.8}
.dash-mock .right{border-left:1px solid var(--border);padding:18px;display:flex;flex-direction:column;gap:14px;background:rgba(255,255,255,.02)}
.dash-mock .alert{display:flex;align-items:flex-start;gap:10px;font-size:12px;line-height:1.5}
.dash-mock .alert .badge{width:7px;height:7px;border-radius:50%;margin-top:5px;flex:none}
.dash-mock .alert .badge.w{background:var(--warning)}
.dash-mock .alert .badge.d{background:var(--danger)}
.dash-mock .alert .badge.s{background:var(--success)}

/* 企微聊天 mockup */
.chat-mock{display:grid;grid-template-columns:180px 1fr 200px;min-height:380px}
.chat-mock .rooms{border-right:1px solid var(--border);padding:14px;background:rgba(255,255,255,.02)}
.chat-mock .room{display:flex;align-items:center;gap:10px;padding:9px 8px;border-radius:8px;margin-bottom:4px}
.chat-mock .room.active{background:var(--bg-soft)}
.chat-mock .avatar{width:28px;height:28px;border-radius:6px;background:var(--accent);display:grid;place-items:center;color:#fff;font-size:11px;font-weight:600}
.chat-mock .room .name{font-size:12px;color:var(--text)}
.chat-mock .room .time{font-size:10px;color:var(--text-dim);margin-left:auto}
.chat-mock .conv{padding:18px;display:flex;flex-direction:column;gap:14px}
.chat-mock .msg{max-width:78%;padding:11px 14px;border-radius:12px;font-size:13px;line-height:1.55}
.chat-mock .msg.bot{align-self:flex-start;background:var(--bg-soft);border:1px solid var(--border);border-top-left-radius:3px;color:var(--text)}
.chat-mock .msg.user{align-self:flex-end;background:var(--accent);color:#fff;border-top-right-radius:3px}
.chat-mock .msg .meta{font-size:10px;color:var(--text-dim);margin-top:6px}
.chat-mock .side{border-left:1px solid var(--border);padding:16px;background:rgba(255,255,255,.02)}
.chat-mock .side .step{display:flex;gap:10px;align-items:flex-start;margin-bottom:16px;font-size:12px}
.chat-mock .side .step .num{width:18px;height:18px;border-radius:50%;background:var(--border);display:grid;place-items:center;font-size:10px;color:var(--text-muted);flex:none}
.chat-mock .side .step.active .num{background:var(--accent);color:#fff}
.chat-mock .side .step .txt{color:var(--text-muted);line-height:1.5}
.chat-mock .side .step.active .txt{color:var(--text)}

/* Section 深色覆盖 */
.page-product .section{padding:100px 0;background:var(--bg)}
.page-product .section.alt{background:var(--bg-soft);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.page-product .section-head h2{color:#fff}
.page-product .section-head p{color:var(--text-muted)}
.page-product .eyebrow{color:var(--text-muted)}

/* Showcase 产品能力 */
.showcase-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:28px}
.showcase-card{background:var(--bg-soft);border:1px solid var(--border);border-radius:14px;padding:28px;transition:border-color .2s,transform .2s}
.showcase-card:hover{border-color:rgba(255,255,255,.18);transform:translateY(-2px)}
.showcase-card .thumb{height:170px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:10px;margin-bottom:22px;overflow:hidden;position:relative}
.showcase-card h3{color:#fff;font-size:18px;font-weight:700;margin-bottom:10px}
.showcase-card p{color:var(--text-muted);font-size:14.5px;line-height:1.7;margin:0}
.showcase-card .tag{display:inline-block;font-size:11px;color:var(--accent);border:1px solid rgba(79,140,255,.35);padding:3px 8px;border-radius:4px;margin-bottom:12px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}

/* 架构图 */
.arch{padding:28px;background:var(--bg-soft);border:1px solid var(--border);border-radius:16px}
.arch svg{width:100%;height:auto;display:block}
.arch .node{fill:var(--bg-elevated);stroke:var(--border);stroke-width:1.5}
.arch .node.accent{stroke:var(--accent);fill:rgba(79,140,255,.08)}
.arch text{fill:var(--text);font-family:var(--sans);font-size:13px;font-weight:500}
.arch text.small{fill:var(--text-muted);font-size:11px;font-weight:400}
.arch .arrow{stroke:var(--border);stroke-width:1.5;marker-end:url(#arrowhead)}
.arch .arrow.accent{stroke:var(--accent)}

/* 技术规格 */
.spec-table{width:100%;border-collapse:collapse;font-size:14.5px}
.spec-table th,.spec-table td{padding:16px 18px;border-bottom:1px solid var(--border);text-align:left}
.spec-table th{color:var(--text-muted);font-weight:500;font-size:12px;letter-spacing:.5px;text-transform:uppercase;background:transparent}
.spec-table td{color:var(--text)}
.spec-table td:first-child{color:#fff;font-weight:600;width:28%}
.spec-table td code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:var(--bg-elevated);padding:3px 7px;border-radius:4px;font-size:12.5px;color:var(--accent)}

/* 代码块 */
.code-block{background:var(--bg-elevated);border:1px solid var(--border);border-radius:10px;padding:18px;overflow-x:auto;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:12.5px;line-height:1.8;color:var(--text-muted)}
.code-block .k{color:var(--accent)}
.code-block .s{color:var(--success)}
.code-block .c{color:var(--text-dim)}

/* FAQ 深色 */
.page-product .faq-list{background:transparent;border:0}
.page-product details{background:var(--bg-soft);border:1px solid var(--border);border-radius:10px;margin-bottom:12px}
.page-product details summary{color:#fff}
.page-product details .a{color:var(--text-muted)}
.page-product details summary .q{color:var(--accent)}
.page-product details[open] summary{border-bottom-color:var(--border)}

/* CTA */
.page-product .cta-band{background:var(--bg-soft);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.page-product .cta-band h2{color:#fff}
.page-product .cta-band p{color:var(--text-muted)}
.page-product .btn-cta{background:#fff;color:var(--bg);font-weight:700}
.page-product .btn-cta:hover{background:var(--text)}

/* Footer */
.page-product footer{background:var(--bg);border-top:1px solid var(--border);color:var(--text-muted)}
.page-product .fbrand{color:#fff}
.page-product .fnav a{color:var(--text-muted)}
.page-product .fnav a:hover{color:#fff}
.page-product .fcontact a{color:var(--text-muted)}
.page-product .fcontact a:hover{color:#fff}
.page-product .icp a{color:var(--text-muted)}
.page-product .icp a:hover{color:#fff}

@media(max-width:980px){
  .product-hero .hero-inner{grid-template-columns:1fr}
  .dash-mock{grid-template-columns:44px 1fr}
  .dash-mock .right{display:none}
  .chat-mock{grid-template-columns:140px 1fr}
  .chat-mock .side{display:none}
  .showcase-grid{grid-template-columns:1fr}
}
@media(max-width:680px){
  .product-hero .wrap{padding:90px 20px 70px}
  .product-hero h1{font-size:32px}
  .dash-mock{grid-template-columns:1fr}
  .dash-mock .sidebar{display:none}
  .chat-mock{grid-template-columns:1fr}
  .chat-mock .rooms{display:none}
}