/* roulang page: index */
:root{
            --bg:#06101e;--bg2:#091a2c;--bg3:#04101c;--panel:rgba(13,39,62,.7);
            --panel2:#0d263d;--line:rgba(142,207,232,.18);--line2:rgba(77,213,240,.38);
            --text:#effaff;--muted:#9ab4c7;--cyan:#48d8ef;--blue:#2588f5;--orange:#ffb45c;
            --danger:#ff755d;--radius:14px;--shadow:0 18px 50px rgba(0,0,0,.28);--max:1240px;
        }
        *{box-sizing:border-box;margin:0;padding:0}
        html{scroll-behavior:smooth}
        body{font-family:"PingFang SC","Microsoft YaHei",Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.7;overflow-x:hidden}
        a{color:inherit;text-decoration:none}button,input,textarea{font:inherit}button{cursor:pointer}
        img{display:block;width:100%;object-fit:cover}ul{list-style:none}
        :focus-visible{outline:3px solid var(--orange);outline-offset:3px}
        .container{width:min(var(--max),calc(100% - 48px));margin:auto}
        .site-header{position:fixed;z-index:50;top:0;left:0;width:100%;background:rgba(4,16,29,.86);backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}
        .info-bar{height:34px;border-bottom:1px solid rgba(142,207,232,.1);font-size:12px;color:var(--muted)}
        .info-inner,.nav-inner{height:100%;display:flex;align-items:center;justify-content:space-between}
        .info-links{display:flex;gap:22px}.info-links span:first-child{color:var(--cyan)}
        .main-nav{height:76px}.brand{display:flex;align-items:center;gap:12px;font-weight:700;font-size:19px;white-space:nowrap}
        .brand-mark{width:34px;height:34px;border:1px solid var(--cyan);display:grid;place-items:center;border-radius:9px;color:var(--cyan);box-shadow:0 0 20px rgba(72,216,239,.22)}
        .brand small{display:block;color:var(--muted);font-size:10px;font-weight:400;line-height:1}
        .nav-list{display:flex;align-items:center;gap:28px;font-size:14px;color:#c1d3df}.nav-list a{transition:.25s}
        .nav-list a:hover,.nav-list a.active{color:var(--cyan)}
        .nav-cta,.btn-primary{background:linear-gradient(110deg,#1b8df0,var(--cyan));color:#03111e;border:0;border-radius:8px;padding:11px 20px;font-weight:700;box-shadow:0 0 24px rgba(72,216,239,.22);transition:.25s}
        .nav-cta:hover,.btn-primary:hover{transform:translateY(-2px);filter:brightness(1.12);box-shadow:0 0 32px rgba(72,216,239,.45)}
        .menu-btn{display:none;background:none;border:1px solid var(--line);color:var(--text);padding:8px 12px;border-radius:7px}
        .hero{min-height:760px;padding-top:110px;display:flex;align-items:center;position:relative;overflow:hidden;background:#061321}
        .hero-slide{position:absolute;inset:0;opacity:0;transition:opacity .7s;background-size:cover;background-position:center}
        .hero-slide.active{opacity:1}.hero-slide:after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(3,13,25,.96) 5%,rgba(3,13,25,.78) 43%,rgba(3,13,25,.18) 100%)}
        .hero-content{position:relative;z-index:2;width:min(1240px,calc(100% - 48px));margin:auto;padding:70px 0 110px}
        .eyebrow,.section-kicker{color:var(--cyan);font-size:12px;letter-spacing:2px;text-transform:uppercase;margin-bottom:18px}
        h1{font-size:clamp(38px,5vw,70px);line-height:1.13;max-width:650px;letter-spacing:1px;margin-bottom:25px}
        .hero-copy{max-width:650px;color:#c7d8e3;font-size:17px;margin-bottom:32px}.hero-actions{display:flex;gap:13px;flex-wrap:wrap}
        .btn-secondary{border:1px solid rgba(157,220,235,.45);border-radius:8px;padding:10px 20px;color:#e6f8ff;background:rgba(9,31,50,.45);transition:.25s}
        .btn-secondary:hover{border-color:var(--cyan);color:var(--cyan);background:rgba(72,216,239,.1)}
        .hero-meta{display:flex;gap:35px;margin-top:58px}.hero-meta strong{display:block;font-size:24px;color:#fff}.hero-meta span{font-size:12px;color:var(--muted)}
        .hero-controls{position:absolute;z-index:3;bottom:42px;right:max(24px,calc((100% - 1240px)/2));display:flex;align-items:center;gap:12px}
        .hero-controls button{width:42px;height:42px;border:1px solid var(--line);background:rgba(4,20,34,.7);color:#fff;border-radius:50%}
        .hero-controls button:hover{border-color:var(--cyan);color:var(--cyan)}.dots{display:flex;gap:7px}.dot{width:24px;height:3px;background:#668091;border:0}.dot.active{background:var(--cyan)}
        section{padding:105px 0;position:relative}.section-head{max-width:760px;margin-bottom:45px}.section-head h2{font-size:clamp(27px,3.4vw,43px);line-height:1.25;margin-bottom:15px}.section-head p{color:var(--muted);font-size:15px}
        .intro{background:var(--bg2)}.intro-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:70px;align-items:center}
        .intro h2{font-size:40px;line-height:1.3;margin-bottom:20px}.intro p{color:var(--muted);margin-bottom:24px}.tag-list{display:flex;gap:9px;flex-wrap:wrap}.tag{padding:6px 11px;border:1px solid var(--line);border-radius:5px;color:#bdebf2;font-size:12px;background:rgba(72,216,239,.05)}
        .data-visual{border:1px solid var(--line);background:linear-gradient(145deg,rgba(17,56,83,.8),rgba(5,21,37,.9));padding:22px;border-radius:var(--radius);box-shadow:var(--shadow);position:relative}
        .visual-top{display:flex;justify-content:space-between;color:var(--muted);font-size:12px;margin-bottom:28px}.live{color:#77edbc}.live:before{content:"";display:inline-block;width:7px;height:7px;background:#77edbc;border-radius:50%;margin-right:6px}
        .chart{height:160px;display:flex;align-items:end;gap:10px;border-bottom:1px solid var(--line);background:repeating-linear-gradient(to top,transparent 0 39px,rgba(142,207,232,.1) 40px)}
        .bar{flex:1;background:linear-gradient(to top,var(--blue),var(--cyan));opacity:.8;border-radius:4px 4px 0 0}.visual-bottom{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:18px}.visual-bottom div{background:rgba(4,17,30,.55);padding:12px}.visual-bottom b{display:block;font-size:20px}.visual-bottom span{font-size:11px;color:var(--muted)}
        .matrix{background:var(--bg)}.matrix-grid{display:grid;grid-template-columns:1.3fr .85fr .85fr;grid-template-rows:1fr 1fr;gap:16px}.service-card,.adv-card,.product-card{border:1px solid var(--line);background:var(--panel);border-radius:var(--radius);padding:26px;transition:.3s}.service-card:hover,.adv-card:hover,.product-card:hover{transform:translateY(-5px);border-color:var(--line2);box-shadow:var(--shadow)}.service-card.wide{grid-row:span 2;background:linear-gradient(145deg,rgba(18,66,94,.76),var(--panel))}
        .icon{width:38px;height:38px;border:1px solid var(--line2);border-radius:9px;display:grid;place-items:center;color:var(--cyan);font-size:18px;margin-bottom:25px}.service-card h3,.adv-card h3,.product-card h3{font-size:19px;margin-bottom:9px}.service-card p,.adv-card p,.product-card p{color:var(--muted);font-size:13px}.service-card .mini{display:inline-block;margin-top:20px;color:var(--cyan);font-size:12px}
        .advantages{background:#071827}.adv-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.adv-card{min-height:190px}.adv-no{font-size:12px;color:var(--orange);display:flex;justify-content:space-between;margin-bottom:20px}.status{color:#75e8ba;font-size:11px}.status:before{content:"●";margin-right:5px}
        .stats{padding:44px 0;background:#04101b;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}.stat{padding-left:22px;border-left:2px solid var(--cyan)}.stat strong{font-size:34px;display:block}.stat span{font-size:12px;color:var(--muted)}
        .products{background:var(--bg2)}.product-grid{display:grid;grid-template-columns:1.2fr .9fr 1fr;gap:18px;align-items:start}.product-card{padding:0;overflow:hidden}.product-card:nth-child(2){margin-top:38px}.product-card img{height:190px}.product-card:nth-child(2) img{height:150px}.product-info{padding:23px}.product-link{display:inline-block;color:var(--cyan);font-size:13px;margin-top:20px}
        .process{background:var(--bg)}.timeline{display:grid;grid-template-columns:repeat(6,1fr);gap:0;position:relative}.timeline:before{content:"";position:absolute;top:18px;left:4%;right:4%;height:1px;background:var(--line2)}.step{position:relative;padding:52px 14px 0}.step b{position:absolute;top:0;left:14px;width:36px;height:36px;border:1px solid var(--cyan);border-radius:50%;background:var(--bg);display:grid;place-items:center;color:var(--cyan)}.step h3{font-size:16px;margin-bottom:8px}.step p{font-size:12px;color:var(--muted)}
        .scenes{background:var(--bg2)}.scene-layout{display:grid;grid-template-columns:250px 1fr;gap:36px}.scene-tabs button{display:block;width:100%;text-align:left;color:var(--muted);background:none;border:0;border-left:2px solid transparent;padding:15px 18px;font-size:15px}.scene-tabs button.active,.scene-tabs button:hover{color:var(--cyan);border-left-color:var(--cyan);background:rgba(72,216,239,.06)}.scene-panel{display:none;grid-template-columns:1fr 1fr;gap:30px;align-items:center}.scene-panel.active{display:grid}.scene-panel img{height:275px;border-radius:var(--radius);border:1px solid var(--line)}.scene-panel h3{font-size:27px;margin-bottom:14px}.scene-panel p{color:var(--muted);font-size:14px}.scene-points{margin-top:20px;border-top:1px solid var(--line)}.scene-points li{padding:11px 0;border-bottom:1px solid var(--line);font-size:13px}.scene-points span{color:var(--cyan);margin-right:9px}
        .case{background:#030d18}.case-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:50px;align-items:center}.case img{height:370px;border-radius:var(--radius);opacity:.88}.case h2{font-size:36px;line-height:1.3;margin-bottom:18px}.case p{color:var(--muted);font-size:14px}.case-data{display:grid;grid-template-columns:repeat(2,1fr);gap:15px;margin-top:28px}.case-data div{border-top:1px solid var(--line2);padding-top:12px}.case-data b{display:block;color:var(--cyan);font-size:21px}.case-data span{font-size:12px;color:var(--muted)}
        .stories{background:var(--bg)}.story-track{display:flex;gap:18px;overflow:auto;padding-bottom:12px;scroll-snap-type:x mandatory}.story{min-width:76%;scroll-snap-align:start;border:1px solid var(--line);padding:34px;background:linear-gradient(120deg,rgba(15,51,76,.72),rgba(8,24,40,.7));border-radius:var(--radius)}.quote{font-size:23px;line-height:1.55;margin-bottom:25px}.story small{color:var(--muted)}
        .news{background:var(--bg2)}.news-list{border-top:1px solid var(--line)}.news-item{display:grid;grid-template-columns:110px 1fr 180px;gap:22px;align-items:center;padding:22px 0;border-bottom:1px solid var(--line)}.news-date{color:var(--cyan);font-size:13px}.news-item h3{font-size:17px}.news-item p{font-size:13px;color:var(--muted)}.news-type{font-size:12px;color:var(--muted);text-align:right}
        .partners{background:var(--bg)}.partner-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}.partner{border:1px solid var(--line);min-height:105px;display:grid;place-items:center;text-align:center;color:#b9ced9;background:rgba(10,31,49,.5);font-size:14px}.partner span{display:block;font-size:11px;color:var(--muted);margin-top:4px}
        .faq{background:var(--bg2)}.faq-list{max-width:900px;border-top:1px solid var(--line)}.faq-item{border-bottom:1px solid var(--line)}.faq-q{width:100%;padding:22px 4px;background:none;border:0;color:var(--text);display:flex;justify-content:space-between;text-align:left;font-size:16px}.faq-q i{font-style:normal;color:var(--cyan);font-size:22px;transition:.25s}.faq-q[aria-expanded=true] i{transform:rotate(45deg)}.faq-a{max-height:0;overflow:hidden;color:var(--muted);font-size:14px;transition:max-height .3s ease}.faq-a p{padding:0 35px 20px 4px}
        .assurance{padding:28px 0;background:#04101b;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.assurance-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:20px}.assurance div{font-size:13px;color:#c9dce6}.assurance b{color:var(--cyan);display:block;font-size:18px;margin-bottom:4px}
        .contact{background:linear-gradient(110deg,#061827,#092b43);overflow:hidden}.contact-grid{display:grid;grid-template-columns:1fr .85fr;gap:80px;align-items:start}.contact h2{font-size:42px;line-height:1.25;margin-bottom:17px}.contact-copy{color:var(--muted);max-width:580px}.contact-info{display:flex;gap:26px;flex-wrap:wrap;margin-top:28px;font-size:13px}.contact-info strong{display:block;color:#fff}.contact-form{background:rgba(2,15,27,.6);border:1px solid var(--line2);padding:27px;border-radius:var(--radius);box-shadow:var(--shadow)}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}.field{margin-bottom:13px}.field label{display:block;color:#bcd4df;font-size:12px;margin-bottom:5px}.field input,.field textarea{width:100%;background:#081e31;border:1px solid var(--line);border-radius:6px;color:#fff;padding:11px 12px;resize:vertical}.field textarea{min-height:90px}.field input:hover,.field textarea:hover,.field input:focus,.field textarea:focus{border-color:var(--cyan);outline:none}.form-submit{width:100%;padding:13px}.form-note{font-size:11px;color:var(--muted);margin-top:10px;text-align:center}
        footer{background:#020a13;padding:42px 0 25px;color:var(--muted);font-size:12px}.footer-top{display:flex;justify-content:space-between;gap:30px;padding-bottom:30px;border-bottom:1px solid var(--line)}.footer-brand{color:#fff;font-size:18px;font-weight:700}.footer-links{display:flex;gap:24px}.footer-links a:hover{color:var(--cyan)}.copyright{display:flex;justify-content:space-between;gap:20px;padding-top:20px}.copyright a:hover{color:var(--cyan)}
        @media(max-width:900px){.nav-list{gap:14px}.intro-grid,.case-grid,.contact-grid{grid-template-columns:1fr;gap:35px}.matrix-grid{grid-template-columns:1fr 1fr}.service-card.wide{grid-column:span 2;grid-row:auto}.timeline{grid-template-columns:repeat(3,1fr);row-gap:38px}.timeline:before{display:none}.product-grid{grid-template-columns:1fr 1fr}.product-card:first-child{grid-column:span 2}.assurance-grid{grid-template-columns:repeat(3,1fr)}}
        @media(max-width:680px){.container,.hero-content{width:min(100% - 32px,var(--max))}.info-links{display:none}.main-nav{height:64px}.brand{font-size:16px}.menu-btn{display:block}.nav-list{display:none;position:absolute;top:98px;left:16px;right:16px;background:#071827;border:1px solid var(--line2);padding:14px;flex-direction:column;align-items:stretch;gap:0;border-radius:10px;box-shadow:var(--shadow)}.nav-list.open{display:flex}.nav-list a{display:block;padding:12px}.nav-cta{display:none}.hero{min-height:680px}.hero-content{padding:55px 0 90px}.hero-copy{font-size:15px}.hero-meta{gap:19px;margin-top:38px}.hero-meta strong{font-size:20px}.hero-controls{bottom:22px;right:16px}section{padding:72px 0}.intro h2,.case h2,.contact h2{font-size:30px}.matrix-grid,.adv-grid,.product-grid,.scene-panel,.stats-grid{grid-template-columns:1fr}.service-card.wide,.product-card:first-child{grid-column:auto}.product-card:nth-child(2){margin-top:0}.scene-layout{grid-template-columns:1fr;gap:18px}.scene-tabs{display:flex;overflow:auto}.scene-tabs button{min-width:130px;border-left:0;border-bottom:2px solid transparent}.scene-tabs button.active{border-bottom-color:var(--cyan);background:none}.scene-panel.active{display:grid}.scene-panel img{height:220px}.case img{height:230px}.story{min-width:92%}.news-item{grid-template-columns:75px 1fr}.news-type{display:none}.partner-grid{grid-template-columns:repeat(2,1fr)}.assurance-grid{grid-template-columns:repeat(2,1fr);gap:22px}.form-row{grid-template-columns:1fr}.footer-top,.copyright{flex-direction:column;gap:18px}.footer-links{flex-wrap:wrap;gap:15px}h1{font-size:39px}}