/* roulang page: index */
:root{
--c-primary:#0E6F63;
--c-primary-deep:#0A574D;
--c-amber:#D89B12;
--c-copper:#B87333;
--c-paper:#F3F1EB;
--c-porcelain:#FBF9F4;
--c-graphite:#1A221F;
--c-dark:#121816;
--c-text:#1A221F;
--c-muted:#5C6561;
--c-invert:#F7F4EE;
--c-line:rgba(14,111,99,.12);
--c-line-dark:rgba(26,34,31,.10);
--r:6px;
--r-tight:2px;
--shadow:0 10px 14px rgba(26,34,31,.08);
--shadow-hard:0 8px 10px rgba(26,34,31,.12);
--w:1240px;
--nav-main:72px;
--space:112px;
--space-m:68px;
--font-serif:"Noto Serif SC","Source Han Serif SC","Songti SC",serif;
--font-sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
html,body{margin:0;padding:0}
body{
font-family:var(--font-sans);
font-size:16px;
line-height:1.75;
color:var(--c-text);
background:var(--c-paper);
overflow-x:hidden;
}
img{max-width:100%;display:block;height:auto}
a{color:var(--c-primary);text-decoration:none;transition:.2s}
a:hover{color:var(--c-primary-deep)}
button,input,select,textarea{font-family:inherit}
button{cursor:pointer;border:0;background:none}
h1,h2,h3,h4{font-family:var(--font-serif);line-height:1.28;margin:0 0 16px;color:var(--c-text);font-weight:700}
h1{font-size:48px}
h2{font-size:30px}
h3{font-size:20px}
p{margin:0 0 18px;color:var(--c-muted)}
ul,ol{margin:0;padding:0;list-style:none}
.container{width:min(100% - 40px,var(--w));margin:0 auto}
.num{font-variant-numeric:tabular-nums;font-feature-settings:"tnum"}
.skip{position:absolute;left:-999px;top:0}
.skip:focus{left:16px;top:16px;z-index:90;background:#fff;padding:8px 12px}
.btn{
display:inline-flex;align-items:center;justify-content:center;gap:8px;
min-height:48px;padding:0 22px;border-radius:var(--r);
font-size:15px;font-weight:600;letter-spacing:.02em;
transition:.2s ease;border:2px solid transparent;
}
.btn-primary{background:var(--c-primary);color:var(--c-invert)}
.btn-primary:hover{background:var(--c-primary-deep);color:#fff;box-shadow:inset 0 0 0 2px var(--c-copper)}
.btn-ghost{background:transparent;color:var(--c-invert);border-color:rgba(247,244,238,.45)}
.btn-ghost:hover{border-color:var(--c-amber);color:#fff}
.btn-line{background:transparent;color:var(--c-primary);border-color:var(--c-primary)}
.btn-line:hover{background:rgba(14,111,99,.08);box-shadow:inset 0 0 0 2px var(--c-copper)}
.btn-amber{background:var(--c-amber);color:var(--c-graphite)}
.btn-amber:hover{filter:brightness(.95);box-shadow:inset 0 0 0 2px #8d6408}
:focus-visible{outline:3px solid var(--c-amber);outline-offset:3px}
.badge{
display:inline-flex;align-items:center;gap:6px;
padding:4px 10px;border-radius:2px;font-size:12px;font-weight:600;
background:rgba(14,111,99,.1);color:var(--c-primary);letter-spacing:.04em;
}
.badge-amber{background:rgba(216,155,18,.16);color:#8d6408}
.badge-dark{background:rgba(247,244,238,.1);color:var(--c-invert)}
.kicker{display:flex;align-items:center;gap:10px;margin-bottom:12px;color:var(--c-copper);font-size:13px;font-weight:600;letter-spacing:.12em}
.kicker::before{content:"";width:22px;height:2px;background:var(--c-copper)}
.section{padding:var(--space) 0;position:relative}
.section-alt{background:var(--c-porcelain)}
.section-head{max-width:760px;margin-bottom:40px}
.section-head p{margin-bottom:0}
.site-header{position:relative;z-index:50}
.tool-bar{
background:var(--c-graphite);color:rgba(247,244,238,.82);font-size:13px;
}
.tool-bar .container{display:flex;align-items:center;justify-content:space-between;min-height:38px;gap:16px}
.tool-left,.tool-right{display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.tool-bar a{color:rgba(247,244,238,.9)}
.tool-bar a:hover{color:var(--c-amber)}
.main-bar{
background:rgba(251,249,244,.94);
backdrop-filter:saturate(1.1);
border-bottom:1px solid var(--c-line);
transition:.25s;
}
.main-bar .container{display:flex;align-items:center;justify-content:space-between;min-height:var(--nav-main);gap:20px}
.site-header.is-stuck .tool-bar{display:none}
.site-header.is-stuck .main-bar{position:fixed;top:0;left:0;right:0;box-shadow:var(--shadow-hard)}
.logo{display:flex;align-items:center;gap:10px;color:var(--c-graphite);font-family:var(--font-serif);font-weight:700;font-size:20px}
.logo svg{flex-shrink:0}
.logo:hover{color:var(--c-primary)}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-links a{
padding:10px 12px;color:var(--c-text);font-size:15px;font-weight:500;position:relative;
}
.nav-links a::after{
content:"";position:absolute;left:12px;right:12px;bottom:6px;height:2px;background:var(--c-primary);transform:scaleX(0);transition:.2s;
}
.nav-links a:hover,.nav-links a.is-active{color:var(--c-primary)}
.nav-links a:hover::after,.nav-links a.is-active::after{transform:scaleX(1)}
.nav-cta{white-space:nowrap}
.burger{
display:none;width:44px;height:44px;align-items:center;justify-content:center;flex-direction:column;gap:5px;
}
.burger span{display:block;width:20px;height:2px;background:var(--c-graphite);transition:.2s}
.drawer{
position:fixed;inset:0 0 0 auto;width:min(88vw,360px);background:var(--c-porcelain);
transform:translateX(100%);transition:.28s ease;z-index:70;padding:24px;
box-shadow:-12px 0 24px rgba(26,34,31,.16);overflow:auto;
}
.drawer.open{transform:none}
.drawer-mask{position:fixed;inset:0;background:rgba(18,24,22,.45);opacity:0;pointer-events:none;transition:.2s;z-index:60}
.drawer-mask.open{opacity:1;pointer-events:auto}
.drawer-tool{font-size:14px;color:var(--c-muted);border-bottom:1px solid var(--c-line);padding-bottom:16px;margin-bottom:12px}
.drawer-tool a{display:block;padding:8px 0;min-height:44px}
.drawer nav a{display:block;padding:14px 0;min-height:44px;color:var(--c-text);font-size:17px;border-bottom:1px solid var(--c-line-dark)}
.drawer nav a.is-active{color:var(--c-primary)}
body.lock{overflow:hidden}
.hero{position:relative;min-height:calc(100vh - 110px);background:var(--c-dark);color:var(--c-invert);overflow:hidden}
.slides{position:relative;min-height:calc(100vh - 110px)}
.slide{position:absolute;inset:0;opacity:0;visibility:hidden;transition:opacity .6s ease;display:grid;align-items:stretch}
.slide.is-on{opacity:1;visibility:visible;position:relative}
.slide-bg{position:absolute;inset:0}
.slide-bg img{width:100%;height:100%;object-fit:cover}
.slide-mask{position:absolute;inset:0;background:linear-gradient(90deg,rgba(18,24,22,.82) 0%,rgba(18,24,22,.46) 52%,rgba(18,24,22,.28) 100%)}
.slide-inner{position:relative;z-index:2;width:min(100% - 40px,var(--w));margin:0 auto;padding:72px 0 96px;display:grid;grid-template-columns:1.15fr .85fr;gap:36px;align-items:center;min-height:calc(100vh - 110px)}
.hero h1,.slide h2.hero-title{font-size:48px;color:var(--c-invert);margin-bottom:18px}
.hero-lead{color:rgba(247,244,238,.88);font-size:16px;max-width:640px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.compare-board{background:rgba(18,24,22,.55);border:1px solid rgba(247,244,238,.12);border-radius:var(--r);overflow:hidden}
.compare-board .pair{display:grid;grid-template-columns:1fr 1fr}
.compare-board article{padding:22px;min-height:220px}
.compare-board .before{background:rgba(26,34,31,.45);border-right:1px solid rgba(247,244,238,.1)}
.compare-board .after{background:rgba(14,111,99,.28)}
.compare-board h3{color:#fff;font-size:18px;margin-bottom:8px}
.compare-board p{color:rgba(247,244,238,.82);margin:0;font-size:14px}
.compare-label{font-size:12px;letter-spacing:.14em;color:var(--c-amber);margin-bottom:8px;font-weight:700}
.hero-ctrl{position:absolute;z-index:3;left:0;right:0;bottom:24px;width:min(100% - 40px,var(--w));margin:0 auto;display:flex;align-items:center;justify-content:space-between}
.hero-dots{display:flex;gap:8px}
.hero-dots button{width:28px;height:4px;background:rgba(247,244,238,.35);border-radius:1px;min-height:44px;padding:20px 0}
.hero-dots button[aria-current="true"]{background:var(--c-amber)}
.hero-arrows{display:flex;gap:8px}
.hero-arrows button,.hero-pause{
width:44px;height:44px;border:1px solid rgba(247,244,238,.3);color:#fff;border-radius:var(--r);
display:grid;place-items:center;background:rgba(18,24,22,.35)
}
.hero-arrows button:hover,.hero-pause:hover{border-color:var(--c-amber)}
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.split img{width:100%;height:460px;object-fit:cover;border-radius:var(--r);box-shadow:var(--shadow);border:1px solid var(--c-line)}
.plate{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0 8px}
.plate span{border:1px solid var(--c-line);padding:6px 10px;font-size:13px;color:var(--c-muted);border-radius:2px;background:#fff}
.service-grid{display:grid;grid-template-columns:280px 1fr;gap:0;border:1px solid var(--c-line);background:#fff;border-radius:var(--r);overflow:hidden;box-shadow:var(--shadow)}
.svc-index button{
display:flex;width:100%;text-align:left;padding:18px 20px;min-height:56px;border-bottom:1px solid var(--c-line);
color:var(--c-text);font-weight:600;background:var(--c-porcelain);gap:10px;align-items:center;
}
.svc-index button span.idx{font-variant-numeric:tabular-nums;color:var(--c-copper);font-size:13px}
.svc-index button[aria-selected="true"]{background:#fff;color:var(--c-primary);box-shadow:inset 3px 0 0 var(--c-primary)}
.svc-panel{padding:36px 40px;min-height:320px}
.svc-panel h3{margin-bottom:10px}
.cap-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.cap-card{background:#fff;border:1px solid var(--c-line);padding:26px 24px;border-radius:var(--r);box-shadow:var(--shadow);transition:.2s}
.cap-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-hard)}
.cap-card h3{font-size:19px}
.cap-card ul{margin-top:12px}
.cap-card li{position:relative;padding-left:14px;color:var(--c-muted);font-size:14px;margin-bottom:6px}
.cap-card li::before{content:"";position:absolute;left:0;top:10px;width:6px;height:1px;background:var(--c-copper)}
.product-stage{display:grid;grid-template-columns:1.4fr 1fr;grid-template-rows:auto auto;gap:16px}
.product-card{position:relative;overflow:hidden;border-radius:var(--r);background:#fff;border:1px solid var(--c-line);box-shadow:var(--shadow);display:grid}
.product-card.big{grid-row:1 / span 2;min-height:520px}
.product-card img{width:100%;height:220px;object-fit:cover}
.product-card.big img{height:280px}
.product-body{padding:22px}
.params{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:16px;background:var(--c-paper);padding:12px;border-radius:2px}
.params div{font-size:12px;color:var(--c-muted)}
.params strong{display:block;color:var(--c-text);font-size:14px;font-variant-numeric:tabular-nums}
.kpi{background:var(--c-porcelain);border-top:1px solid var(--c-line);border-bottom:1px solid var(--c-line)}
.kpi-row{display:grid;grid-template-columns:repeat(6,1fr);gap:8px}
.kpi-item{padding:8px 8px 4px;border-right:1px solid var(--c-line)}
.kpi-item:last-child{border-right:0}
.kpi-item .n{font-size:34px;font-weight:700;font-variant-numeric:tabular-nums;color:var(--c-primary);line-height:1.1;font-family:var(--font-serif)}
.kpi-item .u{font-size:13px;color:var(--c-copper);margin-left:4px}
.kpi-item p{margin:8px 0 0;font-size:13px}
.timeline{display:grid;grid-template-columns:repeat(6,1fr);gap:0;position:relative}
.timeline::before{content:"";position:absolute;left:0;right:0;top:18px;height:2px;background:linear-gradient(90deg,var(--c-copper),var(--c-primary))}
.step{padding:0 10px 0 0}
.step .dot{width:16px;height:16px;border-radius:50%;background:var(--c-primary);border:3px solid #fff;box-shadow:0 0 0 2px var(--c-copper);margin-bottom:18px;position:relative;z-index:1}
.step h3{font-size:18px}
.step p{font-size:14px;margin:0}
.scene-board{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1px solid var(--c-line);background:#fff}
.scene-item{display:grid;grid-template-columns:.9fr 1.1fr;min-height:250px;border-bottom:1px solid var(--c-line);border-right:1px solid var(--c-line)}
.scene-item:nth-child(2n){border-right:0}
.scene-item:nth-last-child(-n+2){border-bottom:0}
.scene-item img{width:100%;height:100%;object-fit:cover;min-height:250px}
.scene-copy{padding:28px}
.scene-copy h3{font-size:20px}
.meta-line{font-size:13px;color:var(--c-muted);margin-top:10px}
.meta-line b{color:var(--c-text);font-weight:600}
.cases{background:var(--c-dark);color:var(--c-invert);padding:var(--space) 0;position:relative;overflow:hidden}
.cases::before{content:"";position:absolute;inset:0;background:url("/assets/images/a96c18d6d0a66c87.webp") center/cover;opacity:.18;filter:grayscale(.3)}
.cases .container{position:relative}
.cases h2,.cases .section-head p{color:var(--c-invert)}
.cases .section-head p{opacity:.82}
.masonry{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.case-tile{background:rgba(18,24,22,.72);border:1px solid rgba(247,244,238,.08);border-radius:var(--r-tight);padding:20px 18px;min-height:168px;transition:.2s;text-align:left;color:inherit;width:100%}
.case-tile:hover{transform:translateY(-2px);border-color:rgba(216,155,18,.5)}
.case-tile .tags{display:flex;gap:8px;margin:12px 0 0;opacity:0;transition:.2s}
.case-tile:hover .tags,.case-tile.is-open .tags{opacity:1}
.case-tile .extra{display:none;margin-top:10px;font-size:13px;color:rgba(247,244,238,.78)}
.case-tile.is-open .extra{display:block}
.story{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;margin-bottom:56px}
.story:last-child{margin-bottom:0}
.story.reverse{direction:rtl}
.story.reverse > *{direction:ltr}
.story img{width:100%;height:340px;object-fit:cover;border-radius:var(--r);border:1px solid var(--c-line)}
.compare-table{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--c-line);border-radius:var(--r);overflow:hidden;box-shadow:var(--shadow)}
.compare-table th,.compare-table td{padding:14px 16px;border-bottom:1px solid var(--c-line);text-align:left;font-size:14px;vertical-align:top}
.compare-table th{background:var(--c-graphite);color:var(--c-invert);font-weight:600}
.compare-table tr:last-child td{border-bottom:0}
.compare-table td:first-child{font-weight:600;color:var(--c-text);width:22%}
.dl-mobile{display:none}
.dl-mobile div{background:#fff;border:1px solid var(--c-line);padding:16px;margin-bottom:10px;border-radius:var(--r)}
.dl-mobile dt{font-weight:700;margin-bottom:6px}
.results{background:linear-gradient(180deg,var(--c-graphite),#0f1613);color:#fff}
.results-row{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.res-item{border-left:3px solid var(--c-amber);padding:8px 0 8px 16px}
.res-item .n{font-size:40px;font-family:var(--font-serif);font-variant-numeric:tabular-nums;line-height:1}
.res-item p{color:rgba(247,244,238,.78);margin:8px 0 0;font-size:14px}
.quote-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.quote{background:#fff;border:1px solid var(--c-line);padding:28px 26px 22px;border-radius:var(--r);position:relative;box-shadow:var(--shadow)}
.quote::before{content:"";position:absolute;left:0;top:0;width:28px;height:3px;background:var(--c-copper)}
.quote p{color:var(--c-text);margin-bottom:16px}
.quote footer{font-size:13px;color:var(--c-muted)}
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.news-card{background:#fff;border:1px solid var(--c-line);border-radius:var(--r);overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column}
.news-card img{height:180px;width:100%;object-fit:cover}
.news-card .body{padding:20px;display:flex;flex-direction:column;flex:1}
.news-card time{font-size:12px;color:var(--c-copper);letter-spacing:.08em}
.partner-track{overflow:hidden;border-top:1px solid var(--c-line);border-bottom:1px solid var(--c-line);background:var(--c-porcelain)}
.partner-row{display:flex;gap:12px;padding:22px 0;animation:marquee 28s linear infinite}
.plate-logo{min-width:180px;border:1px solid var(--c-line);background:#fff;padding:16px 18px;border-radius:2px}
.plate-logo strong{display:block;font-family:var(--font-serif);font-size:16px}
.plate-logo span{font-size:12px;color:var(--c-muted)}
@keyframes marquee{from{transform:translateX(0)}to{transform:translateX(-50%)}}
.faq-list{border-top:1px solid var(--c-line)}
.faq-item{border-bottom:1px solid var(--c-line);background:#fff}
.faq-item button{width:100%;text-align:left;padding:16px 18px;min-height:52px;font-size:16px;font-weight:600;display:flex;justify-content:space-between;gap:16px;align-items:center}
.faq-item.is-open{box-shadow:inset 3px 0 0 var(--c-primary)}
.faq-item .ans{display:none;padding:0 18px 18px;color:var(--c-muted)}
.faq-item.is-open .ans{display:block}
.plus{width:22px;height:22px;position:relative;flex-shrink:0}
.plus::before,.plus::after{content:"";position:absolute;background:var(--c-primary);left:50%;top:50%}
.plus::before{width:12px;height:2px;margin:-1px 0 0 -6px}
.plus::after{width:2px;height:12px;margin:-6px 0 0 -1px}
.faq-item.is-open .plus::after{display:none}
.guarantee{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:28px}
.g-item{background:var(--c-porcelain);border:1px solid var(--c-line);padding:20px;border-radius:var(--r)}
.g-item h3{font-size:18px;margin-bottom:8px}
.contact-wrap{display:grid;grid-template-columns:1fr .85fr;gap:28px;background:#fff;border:1px solid var(--c-line);padding:32px;border-radius:var(--r);box-shadow:var(--shadow)}
label{display:block;font-size:13px;font-weight:600;margin-bottom:6px}
input,select,textarea{
width:100%;min-height:46px;border:1px solid var(--c-line);background:var(--c-porcelain);
padding:10px 12px;border-radius:var(--r);color:var(--c-text)
}
textarea{min-height:96px;resize:vertical}
input:focus,select:focus,textarea:focus{border-color:var(--c-primary);outline:none;box-shadow:0 0 0 3px rgba(14,111,99,.15)}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form-grid .full{grid-column:1/-1}
.form-ok{display:none;padding:14px;background:rgba(14,111,99,.1);border:1px solid var(--c-line);margin-top:12px}
.form-ok.show{display:block}
.contact-aside{background:var(--c-graphite);color:var(--c-invert);padding:28px;border-radius:var(--r)}
.contact-aside h3{color:#fff}
.contact-aside a{color:var(--c-amber)}
.site-footer{background:var(--c-graphite);color:rgba(247,244,238,.78);padding:56px 0 24px}
.foot-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:40px;padding-bottom:32px;border-bottom:1px solid rgba(247,244,238,.1)}
.site-footer h3{color:#fff;font-size:18px}
.foot-links{display:grid;grid-template-columns:1fr 1fr;gap:8px 24px}
.foot-links a{color:rgba(247,244,238,.78)}
.foot-links a:hover{color:var(--c-amber)}
.copy{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;padding-top:18px;font-size:13px}
.wave{
position:absolute;right:-40px;top:40px;width:280px;height:280px;opacity:.06;pointer-events:none;
background:radial-gradient(circle at 30% 30%,#fff 1px,transparent 1.6px) 0 0/22px 22px;
}
@media (max-width:1440px){
h1,.hero h1,.slide h2.hero-title{font-size:44px}
}
@media (max-width:1024px){
h1,.hero h1,.slide h2.hero-title{font-size:36px}
h2{font-size:26px}
.slide-inner,.split,.service-grid,.product-stage,.scene-board,.story,.contact-wrap,.kpi-row,.results-row,.masonry{grid-template-columns:1fr}
.product-card.big{grid-row:auto;min-height:0}
.scene-item{grid-template-columns:1fr}
.nav-links{display:none}
.burger{display:flex}
.kpi-row,.results-row{grid-template-columns:repeat(3,1fr)}
.masonry{grid-template-columns:repeat(2,1fr)}
.cap-grid,.news-grid,.guarantee{grid-template-columns:1fr 1fr}
.timeline{grid-template-columns:1fr 1fr 1fr;gap:24px}
.timeline::before{display:none}
.split img,.story img{height:300px}
.section{padding:80px 0}
}
@media (max-width:768px){
body{font-size:15px}
.container{width:min(100% - 28px,var(--w))}
h1,.hero h1,.slide h2.hero-title{font-size:30px}
h2{font-size:24px}
.tool-bar{display:none}
.slide-inner{padding:48px 0 88px;min-height:70vh}
.compare-board .pair,.form-grid,.quote-grid,.foot-grid,.copy{grid-template-columns:1fr}
.kpi-row,.results-row,.cap-grid,.news-grid,.guarantee,.timeline{grid-template-columns:1fr}
.svc-panel{padding:24px}
.hero-ctrl{bottom:12px}
.contact-wrap{padding:20px}
.compare-table-wrap{display:none}
.dl-mobile{display:block}
.partner-row{animation:none;flex-wrap:wrap}
.section{padding:var(--space-m) 0}
}
@media (max-width:520px){
h1,.hero h1,.slide h2.hero-title{font-size:28px}
.masonry,.quote-grid{grid-template-columns:1fr}
.btn{width:100%}
.hero-actions .btn{flex:1}
.params{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){
html{scroll-behavior:auto}
*,*::before,*::after{animation:none!important;transition:none!important}
}