/* roulang page: index */
:root{
  --blue:#175cd3;--blue-dark:#0d3f9d;--blue-soft:#eaf2ff;--cyan:#0c9b9a;
  --orange:#f28a45;--ink:#14223b;--muted:#63718a;--line:#dfe7f2;
  --paper:#f7faff;--white:#fff;--dark:#10233d;--radius:16px;
  --shadow:0 14px 38px rgba(24,60,110,.09);--shadow-sm:0 6px 18px rgba(24,60,110,.07);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);line-height:1.75;font-size:15px;overflow-x:hidden}
a{text-decoration:none;color:inherit}
img{display:block;max-width:100%;object-fit:cover}
button,input,textarea{font:inherit}
button{cursor:pointer;border:0}
.container{width:min(1180px,calc(100% - 48px));margin:auto}
.topline{height:74px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center}
.nav-main{display:flex;align-items:center;justify-content:space-between;gap:28px}
.logo{display:flex;align-items:center;gap:11px;font-size:20px;font-weight:750;white-space:nowrap;color:var(--blue-dark)}
.logo-mark{width:34px;height:34px;border-radius:10px;background:var(--blue);display:grid;place-items:center;color:white;font-weight:800;box-shadow:0 6px 14px rgba(23,92,211,.25)}
.nav-links{display:flex;align-items:center;gap:6px}
.nav-links a,.quick-links a{padding:10px 13px;border-radius:9px;color:#475873;transition:.2s}
.nav-links a:hover,.nav-links a.active,.quick-links a:hover{color:var(--blue);background:var(--blue-soft)}
.quickbar{height:48px;background:#fbfdff;border-bottom:1px solid var(--line)}
.quick-links{display:flex;align-items:center;height:100%;gap:5px;font-size:13px}
.quick-label{color:var(--muted);margin-right:12px;font-weight:600}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 20px;border-radius:10px;font-weight:650;transition:.2s;border:1px solid transparent;white-space:nowrap}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 7px 16px rgba(23,92,211,.2)}
.btn-primary:hover{background:var(--blue-dark);transform:translateY(-2px)}
.btn-light{background:#eef4ff;color:var(--blue);border-color:#d9e6ff}
.btn-light:hover{background:#dceaff}
.btn-outline{border-color:#b9cbe6;color:var(--blue);background:#fff}
.btn-outline:hover{border-color:var(--blue);background:var(--blue-soft)}
.btn:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid rgba(242,138,69,.45);outline-offset:2px}
.menu-btn{display:none;background:none;color:var(--blue);font-size:25px;padding:8px}
.hero{min-height:630px;position:relative;color:white;background:#173e79;overflow:hidden}
.hero-slide{min-height:630px;display:none;background-size:cover;background-position:center}
.hero-slide.active{display:flex}
.hero-slide:before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(7,29,67,.84),rgba(7,29,67,.35) 58%,rgba(7,29,67,.18))}
.hero-inner{position:relative;z-index:1;display:flex;align-items:center;min-height:630px}
.hero-copy{max-width:680px;padding:70px 0 104px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;color:#b9d3ff;font-weight:650;letter-spacing:.04em;margin-bottom:18px}
.eyebrow:before{content:"";width:24px;height:2px;background:var(--orange)}
h1{font-size:clamp(38px,5vw,68px);line-height:1.18;letter-spacing:.01em;margin-bottom:24px;font-weight:750}
.hero-copy p{font-size:18px;line-height:1.9;color:#e5efff;max-width:650px;margin-bottom:30px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}
.hero .btn-light{background:#fff;color:var(--blue-dark);border:0}
.hero-meta{display:flex;gap:26px;margin-top:34px;color:#d5e5ff;font-size:13px}
.hero-meta strong{display:block;font-size:22px;color:#fff;line-height:1.3}
.carousel-control{position:absolute;z-index:2;bottom:34px;right:max(24px,calc((100% - 1180px)/2));display:flex;gap:9px}
.dot{width:42px;height:6px;background:rgba(255,255,255,.38);border-radius:5px;transition:.2s}
.dot.active{background:#fff;width:64px}
.section{padding:108px 0}
.section-white{background:#fff}
.section-head{max-width:690px;margin-bottom:48px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.kicker{font-size:13px;color:var(--blue);font-weight:750;letter-spacing:.1em;text-transform:uppercase;margin-bottom:10px}
h2{font-size:clamp(28px,3.4vw,44px);line-height:1.25;letter-spacing:.01em;margin-bottom:17px}
.section-head p{color:var(--muted);font-size:16px;max-width:680px}
.intro-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:70px;align-items:center}
.media-frame{border-radius:20px;overflow:hidden;box-shadow:var(--shadow);position:relative;background:#dbe8fa}
.media-frame img{width:100%;aspect-ratio:1.12}
.media-note{position:absolute;right:18px;bottom:18px;background:#fff;padding:12px 16px;border-radius:10px;box-shadow:var(--shadow-sm);font-size:13px}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin:24px 0}
.tag{font-size:13px;padding:5px 11px;color:var(--blue-dark);background:var(--blue-soft);border-radius:30px}
.info-list{list-style:none;border-top:1px solid var(--line)}
.info-list li{display:flex;justify-content:space-between;gap:20px;padding:14px 0;border-bottom:1px solid var(--line)}
.info-list span{color:var(--muted)}.info-list b{font-weight:650}
.pain{background:#f1f6fc}
.pain-grid{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1px solid var(--line);background:#fff}
.pain-col{padding:30px 38px}.pain-col:first-child{border-right:1px solid var(--line)}
.pain-col h3{font-size:20px;margin-bottom:20px}
.issue-list{list-style:none}.issue-list li{display:flex;gap:13px;padding:14px 0;border-bottom:1px dashed var(--line)}
.issue-list li:last-child{border:0}.issue-list i{font-style:normal;color:var(--orange);font-size:18px}
.solution{background:#fff}.solution-layout{display:grid;grid-template-columns:34% 1fr;gap:60px}
.solution-intro{position:sticky;top:24px;align-self:start}.solution-intro .btn{margin-top:24px}
.solution-row{display:grid;grid-template-columns:120px 1fr 150px;gap:24px;padding:22px 0;border-top:1px solid var(--line);align-items:center}
.solution-row:last-child{border-bottom:1px solid var(--line)}
.solution-row b{font-size:18px}.solution-row p,.solution-row small{color:var(--muted)}.solution-row small{font-size:13px}
.steps{background:#f7faff}.step-track{display:grid;grid-template-columns:repeat(5,1fr);gap:0;border-top:2px solid #bcd1f4}
.step{position:relative;padding:26px 18px 8px 0}.step:not(:last-child){margin-right:20px}
.step:before{content:"";position:absolute;top:-10px;left:0;width:18px;height:18px;border:4px solid var(--paper);border-radius:50%;background:var(--blue)}
.step-num{color:var(--blue);font-weight:800;font-size:13px}.step h3{font-size:17px;margin:10px 0}.step p{font-size:13px;color:var(--muted)}
.adv-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:16px}.adv-card{padding:25px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm);transition:.2s}.adv-card:hover,.product-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.adv-card:nth-child(1),.adv-card:nth-child(4){grid-column:span 5}.adv-card:nth-child(2),.adv-card:nth-child(3),.adv-card:nth-child(5),.adv-card:nth-child(6){grid-column:span 3}
.icon{width:36px;height:36px;border-radius:10px;background:var(--blue-soft);color:var(--blue);display:grid;place-items:center;font-weight:800;margin-bottom:18px}
.adv-card h3{font-size:18px;margin-bottom:7px}.adv-card p{font-size:13px;color:var(--muted)}
.status{display:inline-block;margin-top:15px;font-size:12px;color:var(--cyan)}
.products{background:#fff}.product-grid{display:grid;grid-template-columns:1.3fr .85fr .85fr;gap:18px;align-items:stretch}.product-card{border:1px solid var(--line);border-radius:16px;overflow:hidden;background:#fff;transition:.2s}.product-card img{width:100%;height:190px}.product-card:first-child img{height:250px}.product-body{padding:22px}.product-body h3{font-size:20px;margin:8px 0}.product-body p{color:var(--muted);font-size:14px;margin-bottom:17px}
.dark-case{background:var(--dark);color:#fff}.dark-case .section-head p{color:#b9c8df}.case-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:70px;align-items:center}.case-image{border-radius:16px;overflow:hidden}.case-image img{aspect-ratio:1.25}.compare{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:22px 0}.compare div{padding:18px;border-left:2px solid var(--orange);background:#183552}.compare strong{display:block;color:#aecbff;font-size:13px;margin-bottom:6px}.metric-row{display:flex;gap:26px;flex-wrap:wrap}.metric strong{display:block;font-size:28px;color:#fff}.metric span{font-size:12px;color:#a9bbd2}
.story-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:18px}.story{background:#fff;border:1px solid var(--line);padding:30px;border-radius:16px;box-shadow:var(--shadow-sm)}.story.featured{display:flex;gap:25px;align-items:center}.avatar{width:66px;height:66px;border-radius:50%;flex:none}.story blockquote{font-size:18px;line-height:1.75;margin:18px 0}.story small{color:var(--muted)}
.scenes{background:#f1f6fc}.scene-layout{display:grid;grid-template-columns:1fr 1.2fr;gap:60px;align-items:start}.scene-menu{display:flex;flex-wrap:wrap;gap:10px}.scene-menu span{padding:10px 15px;background:#fff;border:1px solid var(--line);border-radius:9px;color:var(--muted)}.scene-menu span:first-child{color:var(--blue);border-color:#9cbcf0}.scene-list{display:grid;grid-template-columns:1fr 1fr;gap:14px}.scene-item{background:#fff;padding:22px;border-radius:13px;border:1px solid var(--line)}.scene-item h3{font-size:17px;margin-bottom:7px}.scene-item p{color:var(--muted);font-size:13px}
.stats{background:#e7f0ff;padding:48px 0}.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px}.stat{border-left:3px solid var(--blue);padding-left:18px}.stat strong{font-size:38px;line-height:1.2;color:var(--blue-dark);display:block}.stat span{color:var(--muted);font-size:13px}
.reviews{background:#fff}.review-wrap{display:flex;gap:18px;overflow-x:auto;padding:5px 0 18px;scroll-snap-type:x mandatory}.review{min-width:330px;flex:1;padding:26px;border:1px solid var(--line);border-radius:14px;scroll-snap-align:start}.review:focus-within{border-color:var(--blue);box-shadow:var(--shadow-sm)}.review p{font-size:17px;line-height:1.7;margin:16px 0}.review b{font-size:14px}.review span{display:block;color:var(--muted);font-size:12px}
.news-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:50px}.news-feature{border-bottom:1px solid var(--line);padding-bottom:24px}.news-feature img{aspect-ratio:1.8;border-radius:14px;margin-bottom:20px}.news-feature h3{font-size:23px}.news-feature p,.news-list p{color:var(--muted);font-size:14px}.news-list li{list-style:none;padding:17px 0;border-bottom:1px solid var(--line)}.news-list time{color:var(--blue);font-size:12px}.news-list h3{font-size:16px;margin:4px 0}
.faq{background:#f7faff}.faq-list{max-width:860px;margin:auto;border-top:1px solid var(--line)}.faq-item{border-bottom:1px solid var(--line)}.faq-q{width:100%;padding:21px 4px;background:none;text-align:left;display:flex;justify-content:space-between;gap:18px;color:var(--ink);font-weight:650;font-size:16px}.faq-q span{color:var(--blue);font-size:22px;line-height:1}.faq-a{display:none;padding:0 38px 21px 4px;color:var(--muted);font-size:14px}.faq-item.open .faq-a{display:block}
.contact{background:#fff}.contact-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:70px;align-items:start}.contact-copy h2{max-width:440px}.contact-points{list-style:none;margin-top:28px}.contact-points li{padding:12px 0;border-bottom:1px solid var(--line);color:var(--muted)}.contact-points b{color:var(--ink);margin-right:12px}.form-box{padding:30px;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);background:#fff}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.field{display:flex;flex-direction:column;gap:6px}.field.full{grid-column:1/-1}.field label{font-size:13px;font-weight:650}.field input,.field textarea{width:100%;border:1px solid #cbd8e9;border-radius:9px;padding:12px 13px;color:var(--ink);background:#fbfdff;transition:.2s}.field textarea{min-height:110px;resize:vertical}.field input:focus,.field textarea:focus{border-color:var(--blue);background:#fff;box-shadow:0 0 0 3px rgba(23,92,211,.1);outline:0}.form-note{font-size:12px;color:var(--muted);margin:14px 0}.form-message{display:none;color:var(--cyan);font-size:14px;margin-top:13px}.footer{background:#10233d;color:#c5d1e2;padding:56px 0 24px}.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:35px}.footer .logo{color:#fff;margin-bottom:15px}.footer h3{color:#fff;font-size:15px;margin-bottom:14px}.footer a{display:block;color:#aebdd1;font-size:13px;padding:4px 0}.footer a:hover{color:#fff}.footer p{font-size:13px;color:#aebdd1}.copyright{border-top:1px solid #29405f;margin-top:40px;padding-top:18px;font-size:12px;color:#91a5c0;display:flex;justify-content:space-between;gap:15px;flex-wrap:wrap}
@media(max-width:1024px){.solution-layout,.case-grid,.scene-layout{gap:35px}.nav-links{gap:0}.nav-links a{padding:9px 8px}.container{width:min(100% - 36px,900px)}}
@media(max-width:768px){.topline{height:66px}.nav-links,.quickbar{display:none}.menu-btn{display:block}.hero,.hero-slide,.hero-inner{min-height:570px}.hero-copy{padding:50px 0 85px}.hero-copy p{font-size:16px}.intro-grid,.pain-grid,.solution-layout,.case-grid,.story-grid,.scene-layout,.news-grid,.contact-grid{grid-template-columns:1fr}.pain-col:first-child{border-right:0;border-bottom:1px solid var(--line)}.solution-intro{position:static}.step-track{grid-template-columns:1fr;border-top:0;border-left:2px solid #bcd1f4;padding-left:22px}.step{padding:0 0 28px}.step:before{top:0;left:-32px}.adv-card:nth-child(n){grid-column:span 6}.product-grid{grid-template-columns:1fr 1fr}.product-card:first-child{grid-column:1/-1}.stats-grid{grid-template-columns:1fr 1fr}.contact-grid{gap:30px}.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.container{width:calc(100% - 32px)}.logo{font-size:17px}.logo-mark{width:30px;height:30px}.section{padding:72px 0}h1{font-size:38px}.hero-meta{gap:17px}.hero-meta strong{font-size:19px}.pain-col{padding:25px 20px}.adv-card:nth-child(n),.product-grid,.scene-list,.form-grid{grid-template-columns:1fr}.adv-card:nth-child(n){grid-column:span 12}.product-card:first-child{grid-column:auto}.product-card img,.product-card:first-child img{height:190px}.stats-grid{gap:20px}.stat strong{font-size:30px}.story.featured{display:block}.story.featured .avatar{margin-bottom:15px}.review{min-width:285px}.form-box{padding:22px 17px}.footer-grid{grid-template-columns:1fr;gap:25px}.copyright{display:block}.copyright span{display:block;margin-top:8px}}
@media(prefers-reduced-motion:reduce){*,html{scroll-behavior:auto!important;transition:none!important}}

@media(max-width:768px){
.nav-links.mobile-open{display:flex;position:fixed;z-index:10;top:66px;left:0;right:0;padding:16px;background:#fff;box-shadow:var(--shadow);flex-direction:column;align-items:stretch;border-top:1px solid var(--line)}
.nav-links.mobile-open a{min-height:44px}
.desktop-action{display:none}
}