/* roulang page: index */
:root{
      --primary:#1677ff;--primary-dark:#0b5dcc;--teal:#0e8f9a;--green:#22a06b;
      --purple:#7048d8;--ink:#111827;--muted:#586579;--soft:#f5f8fb;
      --mint:#edf8f7;--line:#e4e9f0;--white:#fff;--dark:#111a2b;
      --radius:16px;--shadow:0 10px 28px rgba(20,39,70,.07);--ease:all .22s ease;
    }
    *{box-sizing:border-box;margin:0;padding:0}
    html{scroll-behavior:smooth}
    body{font-family:system-ui,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;color:var(--ink);background:var(--white);line-height:1.7;font-size:16px;overflow-x:hidden}
    a{text-decoration:none;color:inherit} img{display:block;max-width:100%} button,input,select,textarea{font:inherit}
    button{cursor:pointer;border:0} ul{list-style:none}.container{width:min(1180px,calc(100% - 40px));margin:auto}
    section{scroll-margin-top:125px;padding:88px 0}.eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--teal);font-size:13px;font-weight:700;letter-spacing:.04em;margin-bottom:13px}
    .eyebrow:before{content:"";width:22px;height:2px;background:var(--teal)}
    h1,h2,h3{line-height:1.25;letter-spacing:0}h1{font-size:clamp(38px,5vw,58px);font-weight:800}h2{font-size:clamp(28px,3.4vw,38px);font-weight:760}h3{font-size:20px}
    .section-head{max-width:680px;margin-bottom:42px}.section-head p{color:var(--muted);margin-top:14px;line-height:1.8}
    .btn{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 23px;border-radius:11px;font-weight:700;transition:var(--ease);gap:8px}
    .btn-primary{color:#fff;background:var(--primary);box-shadow:0 8px 18px rgba(22,119,255,.2)}.btn-primary:hover{background:var(--primary-dark);transform:translateY(-2px)}
    .btn-light{background:#eef5ff;color:var(--primary)}.btn-light:hover{background:#dcecff}.btn-outline{border:1px solid rgba(255,255,255,.35);color:#fff}.btn-outline:hover{background:#fff;color:var(--dark)}
    a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid rgba(22,119,255,.3);outline-offset:3px}
    .topbar{height:39px;background:#f7f9fc;border-bottom:1px solid var(--line);font-size:13px;color:#667085}.topbar .container{height:100%;display:flex;justify-content:space-between;align-items:center}.top-info{display:flex;gap:22px}.trust{color:var(--green);font-weight:650}
    .navbar{height:78px;position:sticky;top:0;z-index:20;background:rgba(255,255,255,.93);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}.navbar .container{height:100%;display:flex;align-items:center;justify-content:space-between}
    .logo{font-size:20px;font-weight:800;display:flex;align-items:center;gap:10px;white-space:nowrap}.logo-mark{width:30px;height:30px;border-radius:9px;background:var(--primary);position:relative}.logo-mark:after{content:"";position:absolute;left:7px;bottom:7px;width:16px;height:8px;border-left:3px solid #fff;border-bottom:3px solid #fff;transform:skewY(-35deg)}
    .nav-links{display:flex;align-items:center;gap:25px;color:#455165;font-size:14px}.nav-links a{position:relative;padding:26px 0}.nav-links a:after{content:"";position:absolute;bottom:17px;left:0;width:0;height:2px;background:var(--primary);transition:var(--ease)}.nav-links a:hover,.nav-links a.active{color:var(--primary)}.nav-links a:hover:after,.nav-links a.active:after{width:100%}.nav-cta{min-height:40px;padding:0 17px!important}
    .menu-toggle{display:none;background:transparent;font-size:25px;width:44px;height:44px;color:var(--ink)}
    .hero{min-height:570px;padding:0;position:relative;display:flex;align-items:center;color:#fff;overflow:hidden;background:#172235 url('/assets/images/dbc5f398611d6342.webp') center/cover no-repeat}.hero:before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(13,27,46,.91) 0%,rgba(18,39,62,.7) 46%,rgba(14,33,53,.28));}.hero:after{content:"";position:absolute;right:-8%;bottom:-20%;width:62%;height:62%;background:var(--teal);opacity:.72;clip-path:polygon(24% 0,100% 0,100% 100%,0 100%)}.hero-content{position:relative;z-index:1;max-width:760px;padding:76px 0 95px}.hero h1{max-width:700px}.hero h1 span{color:#7ee4d9}.hero-copy{font-size:18px;line-height:1.85;color:#e2eaf4;max-width:690px;margin:22px 0 29px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap}.hero-note{display:flex;gap:20px;flex-wrap:wrap;margin-top:30px;color:#c7d5e4;font-size:13px}.hero-note b{color:#fff;font-size:19px;margin-right:5px}
    .metrics{margin-top:-36px;position:relative;z-index:3}.metrics-panel{background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:25px;display:grid;grid-template-columns:repeat(4,1fr);gap:0}.metric{padding:0 22px;border-right:1px solid var(--line)}.metric:first-child{padding-left:4px}.metric:last-child{border:0}.metric strong{display:block;font-size:29px;color:var(--primary)}.metric small{color:var(--muted);font-size:13px}.trend{height:7px;background:#eaf0f7;border-radius:9px;margin-top:12px;overflow:hidden}.trend i{display:block;height:100%;background:var(--green);border-radius:9px}
    .overview{background:var(--soft)}.overview-grid{display:grid;grid-template-columns: .86fr 1.14fr;gap:72px;align-items:center}.overview-copy p{color:var(--muted);margin:19px 0;line-height:1.85}.check-list{display:grid;gap:13px;margin:24px 0}.check-list li{display:flex;gap:10px;align-items:flex-start}.check-list b{color:var(--green);font-size:19px}.preview{border-radius:20px;background:#fff;border:1px solid var(--line);padding:14px;box-shadow:var(--shadow)}.preview img{width:100%;height:330px;object-fit:cover;border-radius:12px}.preview-caption{display:flex;justify-content:space-between;align-items:center;padding:16px 8px 2px;font-size:14px}.status{color:var(--green);font-size:13px;font-weight:700}.status:before{content:"●";margin-right:5px}
    .services{background:#fff}.service-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:17px}.service-card{padding:25px;border:1px solid var(--line);border-radius:var(--radius);transition:var(--ease);background:#fff}.service-card:hover{border-color:#9fc5ff;box-shadow:var(--shadow);transform:translateY(-4px)}.icon{width:42px;height:42px;border-radius:12px;background:#e9f2ff;color:var(--primary);display:grid;place-items:center;font-size:21px;margin-bottom:20px}.service-card:nth-child(2n) .icon{background:#e5f7f3;color:var(--teal)}.service-card:nth-child(3n) .icon{background:#f2ecff;color:var(--purple)}.service-card p,.product-card p{color:var(--muted);font-size:14px;line-height:1.7;margin:8px 0 15px}.tag{display:inline-block;background:#f1f4f8;color:#526174;border-radius:99px;padding:3px 10px;font-size:12px}
    .products{background:var(--mint)}.product-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.product-card{background:#fff;border-radius:18px;overflow:hidden;border:1px solid #dcebea;transition:var(--ease)}.product-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}.product-card img{height:175px;width:100%;object-fit:cover}.product-body{padding:23px}.product-body h3{display:flex;justify-content:space-between;gap:10px}.product-body h3 span{font-size:12px;color:var(--teal);font-weight:600;white-space:nowrap}
    .compare{background:#f8fafc}.compare-box{display:grid;grid-template-columns:1fr 55px 1fr;gap:0;border:1px solid var(--line);border-radius:18px;overflow:hidden;background:#fff}.compare-col{padding:28px 34px}.compare-col.before{background:#f5f6f8}.compare-col.after{background:#eef8f7}.compare-col h3{margin-bottom:18px}.compare-col.after h3{color:var(--teal)}.compare-row{display:flex;justify-content:space-between;gap:20px;padding:12px 0;border-bottom:1px solid rgba(100,116,139,.15);font-size:14px}.compare-row:last-child{border:0}.compare-row span:last-child{font-weight:700;text-align:right}.arrow{display:grid;place-items:center;background:#e8f0fb;color:var(--primary);font-size:27px}
    .dark-case{background:var(--dark);color:#fff;position:relative;overflow:hidden}.dark-case:before{content:"";position:absolute;inset:0;opacity:.13;background-image:linear-gradient(#91a7c4 1px,transparent 1px),linear-gradient(90deg,#91a7c4 1px,transparent 1px);background-size:40px 40px}.dark-case .container{position:relative}.dark-case p{color:#bbc9da}.case-layout{display:grid;grid-template-columns:.8fr 1.2fr;gap:75px;align-items:center}.case-layout h2{max-width:420px}.path-list{display:grid;gap:12px}.path-item{display:grid;grid-template-columns:44px 1fr;gap:15px;align-items:center;padding:17px 20px;border:1px solid rgba(255,255,255,.16);border-radius:13px;background:rgba(255,255,255,.05)}.path-no{width:34px;height:34px;display:grid;place-items:center;border-radius:50%;background:#1eb5b1;color:#fff;font-weight:700}.path-item p{font-size:13px;margin-top:3px}
    .stories{background:#fff}.story-list{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.story{position:relative;padding:26px 24px 24px;border-left:3px solid var(--primary);background:#f8fafc;border-radius:0 15px 15px 0}.story .tag{margin-bottom:16px}.story h3{margin-bottom:9px}.story p{font-size:14px;color:var(--muted)}.story strong{display:block;color:var(--teal);font-size:14px;margin-top:17px}
    .stats-band{padding:45px 0;background:#eaf4ff}.stat-row{display:grid;grid-template-columns:repeat(5,1fr);gap:15px}.stat-item{text-align:center;border-right:1px solid #cbdceb}.stat-item:last-child{border:0}.stat-item strong{display:block;color:var(--primary);font-size:33px}.stat-item span{font-size:13px;color:var(--muted)}.stat-item small{display:block;font-size:11px;color:#8493a5;margin-top:3px}
    .reviews{background:#fff}.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.review{padding:28px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:0 7px 18px rgba(20,39,70,.04)}.review blockquote{font-size:15px;line-height:1.85;color:#39485c;margin-bottom:24px}.review blockquote:before{content:"“";font-size:34px;color:var(--primary);line-height:0;vertical-align:-10px;margin-right:4px}.review-foot{border-top:1px solid var(--line);padding-top:15px;display:flex;justify-content:space-between;font-size:13px}.review-foot span{color:var(--teal)}
    .insights{background:var(--soft)}.insight-layout{display:grid;grid-template-columns:1.08fr .92fr;gap:26px}.feature-news{background:#fff;border-radius:18px;overflow:hidden;border:1px solid var(--line)}.feature-news img{height:245px;width:100%;object-fit:cover}.feature-news div{padding:22px}.feature-news p,.news-item p{color:var(--muted);font-size:14px;margin-top:8px}.news-list{display:grid;gap:12px}.news-item{padding:18px 20px;background:#fff;border:1px solid var(--line);border-radius:13px}.news-item small{color:var(--teal);font-size:12px}.news-item h3{font-size:17px;margin-top:4px}
    .assurance{background:#fff}.assure-grid{display:grid;grid-template-columns:1fr .85fr;gap:70px}.assure-list{display:grid;grid-template-columns:1fr 1fr;gap:16px}.assure-item{padding:19px;border:1px solid var(--line);border-radius:13px}.assure-item b{display:block;margin-bottom:5px}.assure-item p{font-size:13px;color:var(--muted)}.quick{background:#f1f6fb;border-radius:18px;padding:29px}.quick h3{margin-bottom:15px}.quick li{padding:12px 0;border-bottom:1px solid #dce5ee;font-size:14px}.quick li:last-child{border:0}.quick a{color:var(--primary);font-weight:650}
    .faq-contact{background:#f5f8fb}.faq-list{max-width:820px;display:grid;gap:10px;margin-bottom:70px}.faq-item{background:#fff;border:1px solid var(--line);border-radius:13px;overflow:hidden}.faq-q{width:100%;min-height:58px;background:#fff;padding:16px 20px;display:flex;justify-content:space-between;text-align:left;font-weight:700;color:var(--ink)}.faq-q span{font-size:23px;color:var(--primary);transition:var(--ease)}.faq-item.open .faq-q span{transform:rotate(45deg)}.faq-a{max-height:0;overflow:hidden;padding:0 20px;color:var(--muted);font-size:14px;transition:max-height .25s ease,padding .25s ease}.faq-item.open .faq-a{max-height:150px;padding:0 20px 18px}.contact-box{background:var(--dark);border-radius:20px;padding:40px;color:#fff;display:grid;grid-template-columns:.76fr 1.24fr;gap:50px}.contact-box p{color:#c4d0df;margin:15px 0 22px}.contact-info{display:grid;gap:10px;color:#dbe5f1;font-size:14px}.contact-form{display:grid;grid-template-columns:1fr 1fr;gap:14px}.field{display:grid;gap:6px}.field.full{grid-column:1/-1}.field label{font-size:13px;color:#c8d5e4}.field input,.field select,.field textarea{width:100%;border:1px solid #435269;border-radius:10px;background:#1a2638;color:#fff;padding:12px 13px;min-height:45px}.field textarea{min-height:88px;resize:vertical}.field input:focus,.field select:focus,.field textarea:focus{border-color:#62c9d1;outline:2px solid rgba(98,201,209,.2)}.form-submit{grid-column:1/-1;display:flex;align-items:center;gap:15px}.form-message{color:#7ee4d9;font-size:13px;display:none}.form-message.show{display:block}
    footer{background:#0c1422;color:#bac6d5;padding:48px 0 23px;font-size:13px}.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:35px;padding-bottom:35px;border-bottom:1px solid #273448}.footer-logo{color:#fff;margin-bottom:14px}.footer-grid h3{color:#fff;font-size:15px;margin-bottom:14px}.footer-grid li{margin:8px 0}.footer-grid a:hover{color:#7ee4d9}.copyright{display:flex;justify-content:space-between;gap:15px;padding-top:20px;color:#8795a7;font-size:12px}
    @media(max-width:991px){.nav-links{gap:13px}.nav-links a{font-size:13px}.overview-grid,.case-layout,.assure-grid,.contact-box{gap:35px}.service-grid{grid-template-columns:repeat(2,1fr)}.product-grid,.story-list,.review-grid{grid-template-columns:repeat(2,1fr)}.product-card:last-child,.story:last-child,.review:last-child{grid-column:1/-1}.footer-grid{grid-template-columns:repeat(2,1fr)}}
    @media(max-width:767px){.container{width:min(100% - 30px,600px)}section{padding:62px 0}.topbar{height:auto;padding:7px 0}.top-info{gap:10px;justify-content:center;flex-wrap:wrap}.top-info span:nth-child(2){display:none}.navbar{height:68px}.menu-toggle{display:block}.nav-links{display:none;position:absolute;top:68px;left:0;right:0;background:#fff;padding:10px 20px 18px;box-shadow:0 12px 20px rgba(0,0,0,.08);flex-direction:column;align-items:stretch;gap:0}.nav-links.open{display:flex}.nav-links a{padding:12px 0;border-bottom:1px solid var(--line)}.nav-links a:after{display:none}.nav-cta{text-align:center;margin-top:8px}.hero{min-height:590px}.hero-content{padding:55px 0 90px}.hero-copy{font-size:16px}.hero-note{gap:12px}.metrics{margin-top:-27px}.metrics-panel{grid-template-columns:1fr 1fr;gap:18px;padding:19px}.metric{padding:0 10px;border-right:0}.metric strong{font-size:24px}.overview-grid,.case-layout,.assure-grid,.contact-box,.insight-layout{grid-template-columns:1fr}.preview img{height:220px}.service-grid,.product-grid,.story-list,.review-grid{grid-template-columns:1fr}.product-card:last-child,.story:last-child,.review:last-child{grid-column:auto}.stat-row{grid-template-columns:repeat(2,1fr);gap:20px}.stat-item{border-right:0}.stat-item:last-child{grid-column:1/-1}.compare-box{grid-template-columns:1fr;}.arrow{height:40px;transform:rotate(90deg)}.compare-col{padding:23px}.contact-box{padding:28px 20px}.contact-form{grid-template-columns:1fr}.field.full,.form-submit{grid-column:auto}.form-submit{display:block}.form-submit .btn{width:100%;margin-bottom:10px}.footer-grid{grid-template-columns:1fr 1fr;gap:25px}.copyright{display:block}.copyright span{display:block;margin-top:8px}}
    @media(max-width:375px){h1{font-size:34px}.hero{min-height:610px}.metrics-panel{padding:15px 10px}.metric strong{font-size:21px}.btn{width:100%}.hero-actions{display:grid}.footer-grid{grid-template-columns:1fr}}