/* roulang page: index */
:root{--ink:#171a1b;--muted:#687074;--paper:#f5f6f3;--white:#fff;--line:#dfe3df;--acid:#c8ed3b;--acid-dark:#8aa90e;--charcoal:#202628;--radius:8px;--shadow:0 16px 40px rgba(20,28,28,.09);--wrap:1200px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.65;font-size:16px}img{display:block;max-width:100%;height:auto}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button{cursor:pointer}.container{width:min(var(--wrap),calc(100% - 48px));margin:auto}.skip{position:absolute;left:-9999px}.skip:focus{left:16px;top:16px;background:var(--acid);padding:10px;z-index:99}.topbar{background:var(--charcoal);color:#e9ece9;font-size:13px}.topbar-inner{height:38px;display:flex;align-items:center;justify-content:space-between}.topbar span:last-child{color:#bfc8c3}.header{position:sticky;top:0;z-index:20;background:rgba(245,246,243,.96);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}.nav-primary{height:76px;display:flex;align-items:center;justify-content:space-between;gap:30px}.brand{display:flex;align-items:center;gap:12px;font-size:20px;font-weight:800;letter-spacing:-1px}.brand-mark{width:30px;height:30px;border:7px solid var(--ink);border-left-color:var(--acid);border-radius:50%}.nav-actions{display:flex;align-items:center;gap:24px;color:var(--muted);font-size:14px}.nav-actions a:hover{color:var(--ink)}.nav-actions .button{color:var(--ink)}.nav-secondary{border-top:1px solid #e7eae6}.nav-links{display:flex;gap:28px;height:48px;align-items:center;overflow:auto;white-space:nowrap}.nav-links a{font-size:14px;color:var(--muted);height:48px;display:flex;align-items:center;border-bottom:2px solid transparent}.nav-links a:hover,.nav-links a.active{color:var(--ink);border-color:var(--acid-dark)}.button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 20px;border:1px solid var(--ink);border-radius:4px;background:var(--ink);color:#fff;font-weight:700;transition:.25s ease}.button:hover{background:var(--acid);border-color:var(--acid);color:var(--ink);transform:translateY(-2px)}.button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid var(--acid-dark);outline-offset:3px}.button.secondary{background:transparent;color:var(--ink)}.button.secondary:hover{background:var(--ink);color:#fff}.menu-toggle{display:none;border:0;background:none;font-size:25px}.hero{position:relative;height:min(680px,calc(100vh - 114px));min-height:560px;overflow:hidden;background:#333;color:#fff}.hero-slide{position:absolute;inset:0;opacity:0;visibility:hidden;transition:opacity .7s ease}.hero-slide.active{opacity:1;visibility:visible}.hero-slide img{width:100%;height:100%;object-fit:cover}.hero-slide:after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(13,17,17,.78),rgba(13,17,17,.24) 62%,rgba(13,17,17,.12))}.hero-content{position:absolute;z-index:2;left:max(24px,calc((100% - var(--wrap))/2));top:50%;transform:translateY(-50%);width:min(640px,calc(100% - 48px))}.eyebrow,.tag{display:inline-flex;color:var(--acid);font-size:12px;letter-spacing:2px;text-transform:uppercase;font-weight:800;margin-bottom:18px}.hero h1{font-size:clamp(42px,6vw,82px);line-height:1.03;letter-spacing:-3px;margin:0 0 22px;max-width:650px}.hero p{font-size:18px;line-height:1.8;max-width:620px;color:#f0f2ef;margin:0 0 30px}.hero-buttons{display:flex;gap:12px;flex-wrap:wrap}.hero .button{background:var(--acid);border-color:var(--acid);color:var(--ink)}.hero .button.secondary{background:rgba(255,255,255,.08);border-color:#fff;color:#fff}.hero-dots{position:absolute;z-index:3;bottom:34px;left:max(24px,calc((100% - var(--wrap))/2));display:flex;gap:8px}.hero-dots button{width:34px;height:4px;border:0;background:rgba(255,255,255,.45);padding:0}.hero-dots button.active{background:var(--acid);width:70px}.section{padding:108px 0;scroll-margin-top:130px}.section-head{max-width:720px;margin-bottom:48px}.kicker{font-size:12px;letter-spacing:2px;color:var(--acid-dark);font-weight:800;margin-bottom:12px}.section h2{font-size:clamp(30px,4vw,52px);line-height:1.12;letter-spacing:-1.5px;margin:0 0 18px}.section-head p{color:var(--muted);margin:0;font-size:17px;line-height:1.8}.intro-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:60px;align-items:center}.intro-image{height:470px;overflow:hidden}.intro-image img{width:100%;height:100%;object-fit:cover}.intro-copy p{color:var(--muted);font-size:17px}.spec-line{margin-top:30px;padding:20px 0;border-top:1px solid var(--ink);border-bottom:1px solid var(--line);display:flex;justify-content:space-between;gap:20px}.spec-line strong{font-size:25px}.spec-line small{display:block;color:var(--muted)}.metrics{background:#e9ece7}.metric-grid{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--ink);border-bottom:1px solid var(--ink)}.metric{padding:30px 24px;border-right:1px solid var(--ink)}.metric:last-child{border:0}.metric b{font-size:42px;letter-spacing:-2px;display:block}.metric em{font-style:normal;color:var(--acid-dark);font-size:14px}.metric span{display:block;color:var(--muted);margin-top:10px}.service-layout{display:grid;grid-template-columns:.7fr 1.3fr;gap:80px}.service-list{border-top:1px solid var(--line)}.service-item{display:grid;grid-template-columns:56px 1fr;gap:18px;padding:24px 0;border-bottom:1px solid var(--line)}.service-item b{font-size:13px;color:var(--acid-dark)}.service-item h3{margin:0 0 4px;font-size:20px}.service-item p{margin:0;color:var(--muted);font-size:14px}.compare{background:#fff}.table-wrap{overflow-x:auto;border:1px solid var(--line)}table{border-collapse:collapse;width:100%;min-width:680px}th,td{text-align:left;padding:19px 22px;border-bottom:1px solid var(--line)}th{background:var(--charcoal);color:#fff;font-weight:600}td:not(:first-child){font-weight:700}tr:last-child td{border-bottom:0}.timeline{display:flex;gap:0;border-top:1px solid var(--ink);padding-top:30px}.milestone{flex:1;padding:0 24px 0 0;border-right:1px solid var(--line);margin-right:24px}.milestone:last-child{border:0}.milestone strong{font-size:30px}.milestone h3{font-size:18px;margin:12px 0 8px}.milestone p{font-size:14px;color:var(--muted);margin:0}.models{background:#fff}.model-grid{display:grid;grid-template-columns:1.1fr .9fr .9fr;gap:18px}.model-card{border:1px solid var(--line);background:var(--paper);transition:.25s}.model-card:first-child{grid-row:span 2}.model-card:hover{box-shadow:var(--shadow);transform:translateY(-4px)}.model-card img{width:100%;height:240px;object-fit:cover}.model-card:first-child img{height:430px}.model-body{padding:22px}.model-body h3{font-size:24px;margin:0 0 7px}.model-body p{color:var(--muted);font-size:14px;margin:0 0 18px}.model-meta{display:flex;justify-content:space-between;border-top:1px solid var(--line);padding-top:14px;font-size:13px}.dark-story{background:var(--charcoal);color:#fff}.dark-grid{display:grid;grid-template-columns:1fr 1.2fr;gap:70px;align-items:center}.dark-story .section-head p,.dark-copy p{color:#b9c2bd}.dark-copy{border-left:3px solid var(--acid);padding-left:28px}.dark-copy h3{font-size:30px;margin:0 0 15px}.story-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:50px;align-items:center}.story-grid img{height:360px;width:100%;object-fit:cover}.quote{font-size:27px;line-height:1.5;margin:0 0 25px}.story-meta{color:var(--muted);font-size:14px}.stats-band{padding:40px 0;background:var(--acid);}.stats-row{display:flex;justify-content:space-between;gap:25px}.stats-row strong{font-size:35px;display:block}.stats-row span{font-size:13px}.reviews{background:#fff}.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.review{padding:28px;border:1px solid var(--line);min-height:220px}.stars{color:var(--acid-dark);letter-spacing:3px}.review p{font-size:18px;margin:24px 0}.review small{color:var(--muted)}.news-grid{display:grid;grid-template-columns:1.2fr .8fr .8fr;gap:18px}.news-card{border-top:3px solid var(--ink);padding-top:18px}.news-card img{height:180px;width:100%;object-fit:cover;margin-bottom:18px}.news-card h3{font-size:20px;line-height:1.35;margin:10px 0}.news-card p{font-size:14px;color:var(--muted);margin:0}.news-card time{font-size:12px;color:var(--acid-dark)}.assurance{background:#e9ece7}.assure-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--ink);border:1px solid var(--ink)}.assure{background:#e9ece7;padding:28px}.assure b{font-size:30px;color:var(--acid-dark)}.assure h3{margin:12px 0 8px}.assure p{font-size:14px;color:var(--muted);margin:0}.quick{padding:70px 0;background:#fff}.quick-row{display:flex;gap:10px;flex-wrap:wrap}.quick button{background:transparent;border:1px solid var(--line);padding:14px 20px;border-radius:30px;color:var(--muted)}.quick button:hover,.quick button.active{background:var(--ink);color:#fff;border-color:var(--ink)}.quick-answer{margin-top:25px;padding:22px;background:var(--paper);border-left:3px solid var(--acid-dark);color:var(--muted)}.faq-list{max-width:850px;border-top:1px solid var(--ink)}details{border-bottom:1px solid var(--line);padding:20px 0}summary{cursor:pointer;font-size:18px;font-weight:700;list-style:none;display:flex;justify-content:space-between;gap:20px}summary::-webkit-details-marker{display:none}summary:after{content:"＋";color:var(--acid-dark)}details[open] summary:after{content:"－"}details p{color:var(--muted);margin:15px 35px 0 0}.form-section{background:#fff}.form-layout{display:grid;grid-template-columns:.8fr 1.2fr;gap:80px}.lead-note{color:var(--muted);font-size:17px}.contact-line{margin-top:35px;padding-top:20px;border-top:1px solid var(--line)}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.field{display:flex;flex-direction:column;gap:7px}.field.full{grid-column:1/-1}.field label{font-size:14px;font-weight:700}.field label i{color:#a43b32;font-style:normal}.field input,.field select,.field textarea{border:1px solid var(--line);background:var(--paper);padding:13px 14px;border-radius:4px;color:var(--ink);transition:.2s}.field textarea{min-height:110px;resize:vertical}.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--acid-dark);background:#fff;outline:0;box-shadow:0 0 0 3px rgba(200,237,59,.25)}.privacy{font-size:12px;color:var(--muted);margin:18px 0}.form-message{display:none;margin-top:15px;padding:12px;background:#edf6d0;color:#466100}.form-message.show{display:block}.bottom-cta{padding:70px 0;background:var(--charcoal);color:#fff}.cta-inner{display:flex;justify-content:space-between;align-items:center;gap:30px}.bottom-cta h2{margin:0;font-size:clamp(28px,4vw,48px)}.bottom-cta .button{background:var(--acid);border-color:var(--acid);color:var(--ink)}footer{background:#151919;color:#d4dad6;padding:56px 0 25px}.footer-top{display:flex;justify-content:space-between;gap:40px}.footer-brand{font-size:21px;font-weight:800}.footer-brand p{font-size:13px;color:#8d9993;font-weight:400;max-width:330px}.footer-links{display:flex;gap:22px;flex-wrap:wrap;font-size:14px;color:#abb5b0}.footer-links a:hover{color:var(--acid)}.footer-bottom{border-top:1px solid #343c39;margin-top:45px;padding-top:20px;display:flex;justify-content:space-between;gap:20px;color:#87918c;font-size:12px}.mobile-panel{display:none}
@media(max-width:1024px){.service-layout,.form-layout{gap:40px}.model-grid{grid-template-columns:1fr 1fr}.model-card:first-child{grid-row:auto}.model-card:first-child img{height:240px}.news-grid{grid-template-columns:1fr 1fr}.news-card:first-child{grid-column:1/-1}.assure-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:768px){.container{width:min(100% - 32px,var(--wrap))}.topbar-inner{height:34px}.topbar-inner span:last-child{display:none}.nav-primary{height:64px}.nav-actions{display:none}.menu-toggle{display:block}.nav-secondary{display:none}.mobile-panel{position:absolute;display:none;top:64px;left:0;right:0;background:var(--paper);border-bottom:1px solid var(--line);padding:10px 16px;box-shadow:var(--shadow)}.mobile-panel.open{display:block}.mobile-panel a{display:block;padding:13px 8px;border-bottom:1px solid var(--line)}.hero{height:620px;min-height:0}.hero-content{top:44%}.hero h1{font-size:44px;letter-spacing:-2px}.hero p{font-size:16px}.section{padding:75px 0}.intro-grid,.service-layout,.dark-grid,.story-grid,.form-layout{grid-template-columns:1fr}.intro-image{height:300px}.metric-grid{grid-template-columns:1fr 1fr}.metric:nth-child(2){border-right:0}.metric:nth-child(-n+2){border-bottom:1px solid var(--ink)}.timeline{overflow-x:auto;padding-bottom:12px}.milestone{min-width:190px}.model-grid,.review-grid,.news-grid{grid-template-columns:1fr}.news-card:first-child{grid-column:auto}.stats-row{display:grid;grid-template-columns:1fr 1fr}.cta-inner,.footer-top,.footer-bottom{display:block}.cta-inner .button{margin-top:25px}.footer-links{margin-top:28px}.footer-bottom span{display:block;margin-top:10px}.form-grid{grid-template-columns:1fr}.field.full{grid-column:auto}}
@media(max-width:520px){body{font-size:15px}.brand{font-size:17px}.brand-mark{width:25px;height:25px;border-width:6px}.hero h1{font-size:38px}.hero-content{width:calc(100% - 32px);left:16px}.hero-dots{left:16px;bottom:22px}.section h2{font-size:32px}.spec-line{display:block}.spec-line strong{display:block;margin-bottom:8px}.metric{padding:22px 14px}.metric b{font-size:32px}.service-item{grid-template-columns:38px 1fr}.assure-grid{grid-template-columns:1fr}.quote{font-size:22px}.dark-story .section-head{margin-bottom:25px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}