/* roulang page: index */
:root{--green:#a9c83d;--green-dark:#718c19;--ink:#20231f;--text:#30332e;--muted:#6e736a;--paper:#f5f4ee;--fog:#e8e9e2;--line:#d8d9d2;--orange:#c77442;--white:#fff;--radius:18px;--shadow:0 14px 38px rgba(32,35,31,.09);--max:1240px}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;background:var(--paper);color:var(--text);line-height:1.8;font-size:16px}
img{display:block;max-width:100%;width:100%;object-fit:cover}
a{color:inherit;text-decoration:none}
button,input,select{font:inherit}
button{cursor:pointer;border:0}
.container{width:min(var(--max),calc(100% - 48px));margin:auto}
.topbar{height:38px;background:var(--ink);color:#dfe4d5;font-size:12px}
.topbar .container{height:100%;display:flex;align-items:center;justify-content:space-between}
.topbar strong{color:var(--green);font-weight:600}
.top-links{display:flex;gap:22px}
.site-header{position:sticky;top:0;z-index:20;background:rgba(245,244,238,.96);border-bottom:1px solid transparent;transition:.3s}
.site-header.scrolled{box-shadow:0 5px 20px rgba(32,35,31,.08);border-color:var(--line)}
.navbar{height:78px;display:flex;align-items:center;gap:28px}
.logo{display:flex;align-items:center;gap:10px;min-width:220px;font-weight:800;font-size:19px;letter-spacing:-.5px}
.logo-mark{width:34px;height:22px;border:3px solid var(--green-dark);border-left-color:transparent;border-radius:50%;transform:skewX(-22deg);position:relative}
.logo-mark:after{content:"";position:absolute;width:18px;height:3px;background:var(--orange);left:8px;top:7px;transform:rotate(-17deg)}
.nav-menu{display:flex;align-items:center;gap:22px;flex:1}
.nav-menu a{font-size:14px;color:#565b53;position:relative;padding:27px 0;white-space:nowrap}
.nav-menu a:after{content:"";position:absolute;left:0;right:100%;bottom:16px;height:2px;background:var(--green);transition:.25s}
.nav-menu a:hover,.nav-menu a.active{color:var(--ink)}
.nav-menu a:hover:after,.nav-menu a.active:after{right:0}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 20px;border-radius:11px;font-weight:700;font-size:14px;transition:.25s;border:1px solid transparent}
.btn-primary{background:var(--green);color:var(--ink)}
.btn-primary:hover{background:#c0dc55;transform:translateY(-2px)}
.btn-dark{background:var(--ink);color:var(--paper)}
.btn-dark:hover{background:#40453c;transform:translateY(-2px)}
.btn-outline{border-color:var(--ink);color:var(--ink)}
.btn-outline:hover{background:var(--ink);color:var(--paper)}
.btn:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--orange);outline-offset:3px}
.menu-toggle{display:none;background:none;font-size:26px;color:var(--ink);width:44px;height:44px}
.hero{min-height:670px;position:relative;color:#fff;background:#343a32;overflow:hidden}
.hero-slide{min-height:670px;background-size:cover;background-position:center;position:absolute;inset:0;opacity:0;transition:opacity .7s}
.hero-slide.active{opacity:1}
.hero-slide:after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(20,24,20,.8),rgba(20,24,20,.26) 60%,rgba(20,24,20,.12))}
.hero-content{position:relative;z-index:2;padding-top:135px;max-width:700px}
.eyebrow{font-size:13px;letter-spacing:2px;color:var(--green);font-weight:700;text-transform:uppercase}
.hero h1{font-size:clamp(40px,5vw,66px);line-height:1.15;letter-spacing:-2px;margin:20px 0 22px}
.hero p{font-size:18px;line-height:1.9;color:#f0f2e9;max-width:650px}
.hero-actions{display:flex;gap:12px;margin-top:30px}
.hero .btn-outline{border-color:#e5ebdc;color:#fff}
.hero .btn-outline:hover{background:#fff;color:var(--ink)}
.hero-tags{display:flex;gap:10px;margin-top:42px;flex-wrap:wrap}
.hero-tags span,.tag{border:1px solid rgba(255,255,255,.35);padding:5px 12px;border-radius:20px;font-size:13px;color:#e9eedf}
.hero-control{position:absolute;z-index:3;bottom:36px;right:max(24px,calc((100% - 1240px)/2));display:flex;align-items:center;gap:13px}
.hero-control button{background:none;color:#fff;font-size:14px}
.progress{width:100px;height:2px;background:rgba(255,255,255,.35)}
.progress i{display:block;height:100%;background:var(--green);width:33%;transition:.4s}
.section{padding:105px 0}
.section.alt{background:var(--fog)}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:30px;margin-bottom:44px}
.section-kicker{color:var(--green-dark);font-weight:800;font-size:13px;letter-spacing:1px}
h2{font-size:clamp(29px,3.4vw,42px);line-height:1.25;letter-spacing:-1px;color:var(--ink);margin-top:8px}
.section-head p{max-width:480px;color:var(--muted);font-size:15px}
.brand-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:70px;align-items:center}
.media-frame{position:relative}
.media-frame img{height:490px;border-radius:var(--radius)}
.media-frame:after{content:"车辆检测与制造标准";position:absolute;bottom:22px;left:22px;background:var(--ink);color:#fff;padding:8px 14px;font-size:13px;border-left:3px solid var(--green)}
.fact-list{margin-top:28px;border-top:1px solid var(--line)}
.fact{display:grid;grid-template-columns:110px 1fr;gap:20px;padding:17px 0;border-bottom:1px solid var(--line);font-size:14px}
.fact b{color:var(--green-dark)}
.fact span{color:var(--muted)}
.six-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.feature-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:27px;min-height:190px;transition:.25s;position:relative}
.feature-card:hover{border-color:var(--green);transform:translateY(-5px);box-shadow:var(--shadow)}
.feature-num{font-family:monospace;color:var(--orange);font-size:13px}
.feature-icon{font-size:30px;color:var(--green-dark);margin:14px 0 8px}
.feature-card h3{font-size:20px;color:var(--ink);margin-bottom:8px}
.feature-card p,.model-card p,.story p{font-size:14px;color:var(--muted);line-height:1.75}
.models{display:grid;grid-template-columns:1.45fr .9fr;grid-template-rows:1fr 1fr;gap:18px}
.model-card{background:#fff;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);display:grid;grid-template-columns:1.05fr .95fr;transition:.25s}
.model-card:first-child{grid-row:span 2;display:block}
.model-card:hover{box-shadow:var(--shadow);transform:translateY(-4px)}
.model-card img{height:210px}
.model-card:first-child img{height:330px}
.model-info{padding:23px}
.model-label{font-size:12px;color:var(--orange);font-weight:700}
.model-card h3{font-size:25px;color:var(--ink);margin:5px 0 5px}
.specs{display:flex;gap:18px;border-top:1px solid var(--line);margin-top:15px;padding-top:13px}
.specs b{display:block;color:var(--ink);font-family:monospace;font-size:16px}
.specs small{color:var(--muted);font-size:11px}
.model-info .btn{margin-top:16px;min-height:38px;padding:0 14px;font-size:13px}
.timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:0;position:relative}
.timeline:before{content:"";height:2px;background:var(--green);position:absolute;top:42px;left:9%;right:9%}
.scene{text-align:center;position:relative;z-index:1}
.scene img{height:170px;border-radius:16px;margin-bottom:19px;filter:saturate(.82)}
.scene-dot{width:18px;height:18px;border-radius:50%;background:var(--green);border:5px solid var(--paper);box-shadow:0 0 0 1px var(--green-dark);margin:-28px auto 16px}
.scene h3{font-size:18px;color:var(--ink)}
.scene p{font-size:13px;color:var(--muted);padding:0 10px}
.dark-section{background:var(--ink);color:#fff;padding:110px 0}
.dark-section h2{color:#fff}
.dark-grid{display:grid;grid-template-columns:1fr 1fr;gap:80px;align-items:center}
.dark-visual{min-height:390px;border:1px solid #495046;border-radius:20px;padding:35px;position:relative;background:linear-gradient(140deg,#2b3029,#20231f)}
.route-line{height:170px;border-bottom:2px solid var(--green);border-radius:50%;transform:rotate(-10deg);margin:42px 20px}
.route-dot{display:flex;justify-content:space-between;color:var(--green);font-family:monospace;font-size:13px}
.big-number{font-family:monospace;font-size:88px;line-height:1;color:#f5f4ee;margin-top:35px}
.dark-copy p{color:#bfc5b8;margin:20px 0 28px}
.dark-list{display:grid;gap:12px;margin-bottom:28px}
.dark-list div{border-bottom:1px solid #454b42;padding:10px 0;color:#dfe4d7;font-size:14px}
.stories-grid{display:grid;grid-template-columns:1.35fr .8fr .8fr;gap:18px}
.story{background:#fff;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line)}
.story:first-child{grid-row:span 2}
.story img{height:235px}
.story:first-child img{height:330px}
.story-body{padding:23px}
.story h3{font-size:20px;color:var(--ink);margin-bottom:9px}
.story-meta{color:var(--orange);font-size:12px;margin-bottom:8px}
.stats{background:var(--green);padding:43px 0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.stat{border-right:1px solid rgba(32,35,31,.22);padding-left:25px}
.stat:last-child{border:0}
.stat strong{font:700 43px/1 monospace;color:var(--ink)}
.stat span{display:block;font-size:13px;margin-top:8px;color:#3c481d}
.compare-wrap{background:#fff;border:1px solid var(--line);border-radius:18px;overflow:hidden}
.compare-head,.compare-row{display:grid;grid-template-columns:1fr 1.3fr 1.3fr;gap:20px;padding:18px 24px}
.compare-head{background:var(--ink);color:#fff;font-size:13px}
.compare-row{border-bottom:1px solid var(--line);font-size:14px}
.compare-row:last-child{border:0}
.compare-row strong{color:var(--ink)}
.compare-row span{color:var(--muted)}
.review-grid{display:grid;grid-template-columns:1.2fr .9fr .9fr;gap:18px}
.review{background:var(--paper);border:1px solid var(--line);border-radius:16px;padding:26px;min-height:190px}
.stars{color:var(--orange);letter-spacing:3px}
.review blockquote{margin:14px 0;color:var(--ink);font-size:16px}
.review small{color:var(--muted)}
.news-grid{display:grid;grid-template-columns:1.25fr .85fr .85fr;gap:18px}
.news-card{background:#fff;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line)}
.news-card:first-child img{height:245px}
.news-card img{height:150px}
.news-body{padding:22px}
.news-body time{font-size:12px;color:var(--orange)}
.news-body h3{font-size:20px;color:var(--ink);margin:7px 0}
.news-body p{font-size:14px;color:var(--muted)}
.faq-list{max-width:900px;margin:auto;border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item summary{list-style:none;padding:22px 5px;font-weight:700;color:var(--ink);cursor:pointer;display:flex;justify-content:space-between}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary:after{content:"+";font-size:24px;color:var(--green-dark)}
.faq-item[open] summary:after{content:"−"}
.faq-answer{padding:0 40px 22px 5px;color:var(--muted);font-size:14px}
.assurance{padding:35px 0;background:var(--paper);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.assurance-grid{display:grid;grid-template-columns:repeat(4,1fr)}
.assure{padding:0 25px;border-right:1px solid var(--line)}
.assure:first-child{padding-left:0}
.assure:last-child{border:0}
.assure b{display:block;color:var(--green-dark);font-size:14px}
.assure span{font-size:14px;color:var(--muted)}
.contact{background:#dfe4d5}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:80px;align-items:start}
.contact-copy h2{max-width:500px}
.contact-copy p{color:var(--muted);margin:18px 0 27px}
.contact-info{font-size:14px;color:var(--ink);line-height:2}
.form-box{background:#fff;border-radius:18px;padding:30px;box-shadow:var(--shadow)}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px}
.field{display:flex;flex-direction:column;gap:6px}
.field.full{grid-column:1/-1}
.field label{font-size:13px;color:var(--ink);font-weight:700}
.field input,.field select{height:45px;border:1px solid var(--line);border-radius:9px;padding:0 12px;background:#fbfbf8;color:var(--text)}
.check{font-size:12px;color:var(--muted);margin:16px 0;display:flex;gap:8px;align-items:flex-start}
.form-message{font-size:13px;margin-top:12px;min-height:24px}
.form-message.error{color:#ae4d2d}.form-message.success{color:var(--green-dark)}
.footer{background:var(--ink);color:#e9eee1;padding:65px 0 30px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:70px;padding-bottom:45px;border-bottom:1px solid #454b42}
.footer .logo{color:#fff}
.footer p,.footer li,.footer a{color:#aeb6a8;font-size:13px}
.footer p{margin-top:16px;max-width:330px}
.footer h3{font-size:14px;color:#fff;margin-bottom:14px}
.footer ul{list-style:none;display:grid;gap:7px}
.footer a:hover{color:var(--green)}
.copyright{display:flex;justify-content:space-between;gap:20px;padding-top:23px;color:#889185;font-size:12px}
.bottom-bar{position:fixed;z-index:19;bottom:0;left:0;right:0;background:rgba(32,35,31,.97);color:#fff;padding:11px max(24px,calc((100% - 1240px)/2));display:flex;justify-content:space-between;align-items:center;font-size:13px}
.bottom-bar strong{color:var(--green)}
.bottom-actions{display:flex;align-items:center;gap:15px}.bottom-actions a:first-child{color:#dfe4d5}
@media(max-width:1024px){.nav-menu{gap:12px}.logo{min-width:190px}.brand-grid,.dark-grid,.contact-grid{gap:35px}.models{grid-template-columns:1fr 1fr}.model-card:first-child{grid-column:1/-1;grid-row:auto}.stories-grid{grid-template-columns:1fr 1fr}.story:first-child{grid-row:auto}.story:first-child img{height:235px}}
@media(max-width:768px){.container{width:min(100% - 32px,var(--max))}.top-links{display:none}.navbar{height:66px;justify-content:space-between}.logo{min-width:auto;font-size:16px}.nav-menu{display:none;position:absolute;top:66px;left:0;right:0;background:var(--paper);padding:15px 22px 25px;flex-direction:column;align-items:stretch;box-shadow:0 12px 20px rgba(0,0,0,.1)}.nav-menu.open{display:flex}.nav-menu a{padding:10px 0}.nav-menu a:after{bottom:4px}.nav-cta{display:none}.menu-toggle{display:block}.hero,.hero-slide{min-height:650px}.hero-content{padding-top:105px}.hero h1{font-size:42px}.hero p{font-size:16px}.section,.dark-section{padding:75px 0}.section-head{display:block;margin-bottom:30px}.section-head p{margin-top:15px}.brand-grid,.dark-grid,.contact-grid{grid-template-columns:1fr}.media-frame img{height:340px}.six-grid{grid-template-columns:repeat(2,1fr)}.models,.stories-grid,.news-grid,.review-grid{grid-template-columns:1fr}.model-card:first-child{grid-column:auto}.model-card,.model-card:first-child{display:block}.timeline{grid-template-columns:1fr;gap:26px}.timeline:before{height:auto;width:2px;left:9px;top:20px;bottom:20px}.scene{text-align:left;padding-left:36px;display:grid;grid-template-columns:110px 1fr;gap:14px}.scene img{height:90px;grid-row:span 2}.scene-dot{position:absolute;left:0;top:35px;margin:0}.scene h3{align-self:end}.scene p{padding:0;text-align:left}.stats-grid{grid-template-columns:1fr 1fr;gap:22px}.stat{border:0;padding:0}.compare-wrap{border:0;background:none}.compare-head{display:none}.compare-row{display:block;background:#fff;border:1px solid var(--line);border-radius:13px;margin-bottom:10px;padding:17px}.compare-row strong,.compare-row span{display:block;margin:5px 0}.assurance-grid{grid-template-columns:1fr 1fr;gap:22px}.assure{padding:0;border:0}.footer-grid{grid-template-columns:1fr 1fr;gap:30px}.copyright{display:block}.copyright span{display:block;margin-top:8px}.bottom-bar{padding:10px 16px}.bottom-bar>span{display:none}}
@media(max-width:520px){.hero-actions{flex-direction:column;align-items:stretch;max-width:210px}.hero-tags{margin-top:28px}.six-grid{grid-template-columns:1fr}.feature-card{min-height:155px}.model-card img,.model-card:first-child img{height:220px}.specs{gap:10px}.stories-grid{display:block}.story{margin-bottom:16px}.news-card img,.news-card:first-child img{height:210px}.form-grid{grid-template-columns:1fr}.field.full{grid-column:auto}.footer-grid{grid-template-columns:1fr}.footer{padding-bottom:90px}.bottom-actions{width:100%;justify-content:space-between}.bottom-actions .btn{min-height:40px}.big-number{font-size:65px}.hero-control{right:16px}.topbar .container{justify-content:center}}