/* roulang page: index */
:root{
  --c-primary:#0FBF7A;
  --c-primary-2:#0A9F68;
  --c-primary-d:#087A50;
  --c-ink:#151A18;
  --c-graphite:#1C2420;
  --c-cyan:#1AD4C0;
  --c-amber:#D99212;
  --c-bg:#F3F6F4;
  --c-bg-2:#E7EEEA;
  --c-card:#fff;
  --c-muted:#5C6660;
  --c-line:#D5DDD8;
  --c-dark:#0E1412;
  --c-dark-2:#141C18;
  --c-light:#F7FAF8;
  --radius:10px;
  --radius-sm:8px;
  --radius-btn:7px;
  --shadow:0 1px 0 rgba(21,26,24,.04),0 8px 18px rgba(21,26,24,.06);
  --shadow-2:0 2px 0 rgba(21,26,24,.05),0 14px 28px rgba(21,26,24,.10);
  --container:1240px;
  --nav-h:72px;
  --gap:24px;
  --ff:"Noto Sans SC","PingFang SC","HarmonyOS Sans","Microsoft YaHei",sans-serif;
  --fn:ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
}
*,*:before,*:after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:86px}
html,body{margin:0;padding:0;overflow-x:hidden}
body{font-family:var(--ff);font-size:16px;line-height:1.75;color:var(--c-ink);background:var(--c-bg);-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font-family:inherit}
button{cursor:pointer}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p{margin:0}
:where(a,button,input,select,summary,textarea,[tabindex]):focus-visible{outline:2px solid var(--c-amber);outline-offset:2px}
.skip{position:absolute;left:-999px;top:8px;background:#fff;padding:8px 12px;z-index:80}
.skip:focus{left:8px}
.container{width:min(var(--container),calc(100% - 40px));margin:0 auto}
.num{font-family:var(--fn);font-variant-numeric:tabular-nums;letter-spacing:-.03em}
.section{padding:96px 0;position:relative}
.section-head{max-width:760px;margin:0 0 40px}
.kicker{display:inline-flex;align-items:center;gap:8px;font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--c-primary-d);font-weight:700;margin-bottom:10px}
.kicker:before{content:"";width:18px;height:3px;background:var(--c-primary);border-radius:2px}
.section h2{font-size:30px;line-height:1.28;font-weight:700;letter-spacing:-.02em;color:var(--c-ink)}
.lead{margin-top:12px;color:var(--c-muted);font-size:15px;line-height:1.8}
.badge{display:inline-flex;align-items:center;gap:6px;height:28px;padding:0 10px;border:1px solid var(--c-line);border-radius:6px;background:#fff;font-size:12px;color:var(--c-graphite);font-weight:600}
.badge.pow{border-color:rgba(15,191,122,.35);background:rgba(15,191,122,.08);color:var(--c-primary-d)}
.badge.warn{border-color:rgba(217,146,18,.35);background:rgba(217,146,18,.1);color:#8A5C00}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:0 18px;border-radius:var(--radius-btn);border:1px solid transparent;font-size:15px;font-weight:700;letter-spacing:.01em;transition:transform .18s ease,background .18s ease,border-color .18s ease,box-shadow .18s ease,filter .18s ease;text-align:center}
.btn-primary{background:var(--c-primary);color:#fff;box-shadow:0 1px 0 rgba(0,0,0,.08)}
.btn-primary:hover{background:var(--c-primary-2);transform:translateY(-2px);filter:brightness(1.03)}
.btn-primary:active{transform:translateY(0);filter:brightness(.98)}
.btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.45)}
.btn-ghost:hover{background:rgba(255,255,255,.08);transform:translateY(-2px)}
.btn-line{background:#fff;color:var(--c-graphite);border-color:var(--c-ink)}
.btn-line:hover{border-color:var(--c-primary);color:var(--c-primary-d);transform:translateY(-2px);box-shadow:var(--shadow)}
.btn-text{background:none;border:none;color:var(--c-cyan);padding:0 2px;min-height:44px;font-weight:700;text-decoration:underline;text-underline-offset:4px}
.btn-text:hover{color:var(--c-primary-d)}
.site-header{position:relative;z-index:50}
.toolbar{background:var(--c-graphite);color:#C9D4CE;font-size:13px}
.toolbar-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:38px}
.toolbar a{color:#E8F3ED}
.toolbar a:hover{color:var(--c-primary)}
.toolbar-left,.toolbar-right{display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.trust{display:flex;gap:8px;flex-wrap:wrap}
.trust span{display:inline-flex;align-items:center;gap:6px;height:24px;padding:0 8px;border:1px solid rgba(255,255,255,.12);border-radius:4px;color:#DCE8E2;font-size:11px}
.trust i{width:6px;height:6px;border-radius:1px;background:var(--c-primary);display:inline-block}
.nav-row{position:sticky;top:0;z-index:60;background:#fff;border-bottom:1px solid var(--c-line);transition:box-shadow .2s ease}
.nav-row.is-stuck{box-shadow:0 8px 20px rgba(14,20,18,.08)}
.nav-inner{display:flex;align-items:center;gap:18px;min-height:var(--nav-h)}
.logo{display:flex;align-items:center;gap:10px;flex:0 0 auto;min-height:44px}
.logo-mark{width:36px;height:36px;border-radius:8px;background:var(--c-ink);display:grid;place-items:center;color:var(--c-primary)}
.logo-text{font-size:18px;font-weight:800;letter-spacing:-.03em;color:var(--c-ink)}
.nav-links{display:flex;align-items:center;gap:4px;margin-left:auto}
.nav-links a{position:relative;display:flex;align-items:center;min-height:44px;padding:0 10px;font-size:14px;font-weight:600;color:var(--c-graphite)}
.nav-links a:hover{color:var(--c-primary-d)}
.nav-links a.is-active{color:var(--c-primary-d)}
.nav-links a.is-active:after{content:"";position:absolute;left:10px;right:10px;bottom:8px;height:2px;background:var(--c-primary);border-radius:2px}
.nav-cta{margin-left:8px}
.menu-btn{display:none;width:44px;height:44px;border:1px solid var(--c-line);border-radius:8px;background:#fff;align-items:center;justify-content:center;flex-direction:column;gap:5px}
.menu-btn span{display:block;width:18px;height:2px;background:var(--c-ink);border-radius:1px}
.drawer{position:fixed;inset:0;background:rgba(14,20,18,.46);opacity:0;pointer-events:none;transition:opacity .2s ease;z-index:70}
.drawer.open{opacity:1;pointer-events:auto}
.drawer-panel{position:absolute;top:0;right:0;width:min(360px,88vw);height:100%;background:#fff;padding:24px 20px;transform:translateX(100%);transition:transform .22s ease;display:flex;flex-direction:column;gap:8px;box-shadow:var(--shadow-2)}
.drawer.open .drawer-panel{transform:none}
.drawer-panel a{display:flex;align-items:center;min-height:44px;padding:0 12px;border-radius:8px;font-weight:700;color:var(--c-ink)}
.drawer-panel a:hover,.drawer-panel a.is-active{background:rgba(15,191,122,.1);color:var(--c-primary-d);box-shadow:inset 3px 0 0 var(--c-primary)}
.drawer-close{align-self:flex-end;width:44px;height:44px;border:1px solid var(--c-line);border-radius:8px;background:#fff}
.hero{position:relative;min-height:640px;background:#0E1412;color:#fff;overflow:hidden}
.hero-track{display:flex;height:100%;transition:transform .55s ease}
.hero-slide{position:relative;min-width:100%;min-height:640px;display:flex;align-items:center}
.hero-slide img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.hero-mask{position:absolute;inset:0;background:linear-gradient(90deg,rgba(8,12,10,.82) 0%,rgba(8,12,10,.55) 46%,rgba(8,12,10,.22) 100%)}
.hero-copy{position:relative;z-index:2;padding:72px 0;max-width:720px}
.hero-copy h1,.hero-title{font-size:44px;line-height:1.18;font-weight:700;letter-spacing:-.03em}
.hero-copy .desc{margin:16px 0 22px;font-size:16px;line-height:1.8;color:#D5E4DC;max-width:640px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:18px}
.hero-badges{display:flex;flex-wrap:wrap;gap:8px}
.hero-badges .badge{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.18);color:#EAF6F0}
.region-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.chip{min-height:36px;padding:0 12px;border-radius:6px;border:1px solid rgba(255,255,255,.2);background:rgba(14,20,18,.35);color:#fff;font-size:13px;font-weight:700;display:inline-flex;align-items:center}
.chip:hover{border-color:var(--c-primary);color:var(--c-primary)}
.hero-ctrl{position:absolute;inset:auto 20px 22px auto;z-index:3;display:flex;align-items:center;gap:10px}
.hero-ctrl button{width:44px;height:44px;border-radius:8px;border:1px solid rgba(255,255,255,.2);background:rgba(14,20,18,.55);color:#fff}
.hero-dots{display:flex;gap:8px}
.hero-dots button{width:22px;height:6px;border:0;border-radius:2px;background:rgba(255,255,255,.35);padding:0;min-width:22px}
.hero-dots button.on{background:var(--c-primary);width:32px}
.sec-alt{background:#fff}
.sec-fog{background:var(--c-bg)}
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.split img,.media{border-radius:12px;border:1px solid var(--c-line);box-shadow:var(--shadow);width:100%;object-fit:cover}
.spec-list{margin-top:18px;display:grid;gap:10px}
.spec-list li{display:flex;gap:10px;align-items:flex-start;font-size:15px;color:var(--c-ink)}
.spec-list b{color:var(--c-primary-d)}
.grid-6{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--gap)}
.f-card{background:#fff;border:1px solid var(--c-line);border-radius:12px;padding:22px;box-shadow:var(--shadow);transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease;min-height:100%}
.f-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-2);border-color:var(--c-primary)}
.ico{width:44px;height:44px;border-radius:8px;background:var(--c-ink);color:var(--c-primary);display:grid;place-items:center;margin-bottom:14px}
.f-card h3{font-size:18px;margin-bottom:8px}
.f-card p{font-size:15px;color:var(--c-muted)}
.prod-grid{display:grid;grid-template-columns:1.35fr .82fr .82fr;gap:20px;align-items:stretch}
.p-card{background:#fff;border:1px solid var(--c-line);border-radius:12px;overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column;transition:transform .18s ease,border-color .18s ease}
.p-card:hover{transform:translateY(-3px);border-color:var(--c-primary)}
.p-card.feature{background:var(--c-dark);color:#EAF6F0;border-color:#223028}
.p-card img{width:100%;height:220px;object-fit:cover}
.p-card.feature img{height:280px}
.p-body{padding:20px 20px 22px;display:flex;flex-direction:column;gap:10px;flex:1}
.p-card h3{font-size:20px}
.p-meta{display:flex;flex-wrap:wrap;gap:8px}
.p-card p{font-size:15px;color:var(--c-muted)}
.p-card.feature p{color:#C5D5CC}
.p-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:auto}
.scene-rail{display:grid;grid-auto-flow:column;grid-auto-columns:minmax(280px,1fr);gap:16px;overflow-x:auto;scroll-snap-type:x mandatory;padding-bottom:8px}
.scene-card{position:relative;min-height:280px;border-radius:12px;overflow:hidden;scroll-snap-align:start;border:1px solid var(--c-line)}
.scene-card img{width:100%;height:100%;object-fit:cover;min-height:280px}
.scene-card figcaption{position:absolute;inset:auto 0 0;padding:18px;background:linear-gradient(180deg,transparent,rgba(8,12,10,.86));color:#fff}
.scene-card h3{font-size:18px;margin-bottom:6px}
.scene-card p{font-size:14px;color:#D7E4DC}
.demo{display:grid;grid-template-columns:.9fr 1.1fr;gap:28px;align-items:stretch}
.screen{background:var(--c-dark);border-radius:12px;border:1px solid #223028;padding:16px;color:#DCE8E2;box-shadow:var(--shadow-2)}
.tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px}
.tabs button{min-height:44px;padding:0 14px;border-radius:7px;border:1px solid #2A3832;background:#151C19;color:#DCE8E2;font-weight:700}
.tabs button.on{background:var(--c-primary);color:#fff;border-color:var(--c-primary)}
.screen-view img{width:100%;height:280px;object-fit:cover;border-radius:8px}
.kpi{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:12px}
.kpi div{background:#151C19;border:1px solid #2A3832;border-radius:8px;padding:10px 12px}
.kpi b{display:block;font-family:var(--fn);font-size:18px;color:var(--c-primary)}
.kpi span{font-size:12px;color:#A9B8B1}
.table-wrap{overflow:auto;border:1px solid var(--c-line);border-radius:12px;background:#fff;box-shadow:var(--shadow)}
table{width:100%;border-collapse:collapse;min-width:720px}
th,td{padding:14px 16px;text-align:left;font-size:14px;border-bottom:1px solid var(--c-line)}
thead th{background:#F7FAF8;position:sticky;top:0;z-index:1;font-size:13px;letter-spacing:.04em;color:var(--c-muted)}
tbody tr:hover{background:rgba(15,191,122,.05)}
.m-cards{display:none}
.timeline{position:relative;margin-left:8px}
.timeline:before{content:"";position:absolute;left:15px;top:0;bottom:0;width:2px;background:linear-gradient(var(--c-primary),#C9E8DA)}
.t-item{display:grid;grid-template-columns:32px 1fr;gap:16px;margin-bottom:22px}
.t-dot{width:32px;height:32px;border-radius:8px;background:var(--c-ink);color:var(--c-primary);display:grid;place-items:center;font-family:var(--fn);font-size:12px;font-weight:700;position:relative;z-index:1}
.t-item h3{font-size:18px}
.t-item p{color:var(--c-muted);font-size:15px}
.dark-sec{background:var(--c-dark);color:#E7F1EC;padding:96px 0}
.dark-sec h2{color:#fff}
.dark-sec .lead{color:#B7C6BF}
.case-list{display:grid;gap:22px}
.case{display:grid;grid-template-columns:1.15fr .85fr;gap:22px;align-items:center;background:#141C18;border:1px solid #24312B;border-radius:12px;overflow:hidden}
.case img{width:100%;height:100%;min-height:240px;object-fit:cover}
.case-body{padding:22px}
.metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:14px 0 18px}
.metrics div{background:#0E1412;border:1px solid #2A3832;border-radius:8px;padding:10px}
.metrics b{display:block;font-family:var(--fn);font-size:20px;color:var(--c-primary)}
.metrics span{font-size:12px;color:#A9B8B1}
.price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;align-items:stretch}
.price{background:#fff;border:1px solid var(--c-line);border-radius:12px;padding:24px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:12px}
.price.rec{border:1px solid var(--c-primary);transform:translateY(-8px);box-shadow:var(--shadow-2)}
.price h3{font-size:20px}
.price .fee{font-family:var(--fn);font-size:28px;font-weight:800;letter-spacing:-.04em}
.price ul{display:grid;gap:8px;color:var(--c-muted);font-size:14px}
.price li:before{content:"";display:inline-block;width:7px;height:7px;background:var(--c-primary);margin-right:8px;border-radius:1px}
.fold{margin-top:22px;background:#fff;border:1px solid var(--c-line);border-radius:10px;padding:6px 16px}
.fold summary{min-height:44px;display:flex;align-items:center;font-weight:700;cursor:pointer}
.story{display:grid;grid-template-columns:1.2fr .8fr;gap:24px}
.story-main{background:#fff;border:1px solid var(--c-line);border-radius:12px;overflow:hidden;box-shadow:var(--shadow)}
.story-main img{width:100%;height:280px;object-fit:cover}
.story-main .txt,.side .txt{padding:20px}
.side{display:grid;gap:16px}
.side article{display:grid;grid-template-columns:120px 1fr;background:#fff;border:1px solid var(--c-line);border-radius:12px;overflow:hidden}
.side img{width:120px;height:100%;object-fit:cover}
.stats{background:var(--c-bg-2);padding:56px 0;border-top:1px solid var(--c-line);border-bottom:1px solid var(--c-line)}
.stat-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:12px}
.stat{background:#fff;border:1px solid var(--c-line);border-radius:10px;padding:18px 14px;text-align:left;box-shadow:var(--shadow)}
.stat b{display:block;font-family:var(--fn);font-size:28px;color:var(--c-ink)}
.stat span{font-size:13px;color:var(--c-muted)}
.wall{columns:3;column-gap:16px}
.rev{break-inside:avoid;background:#fff;border:1px solid var(--c-line);border-radius:10px;padding:18px;margin:0 0 16px;box-shadow:var(--shadow)}
.rev p{font-size:15px;color:var(--c-ink)}
.rev .who{margin-top:12px;font-size:13px;color:var(--c-muted);font-weight:700}
.voices{display:grid;grid-template-columns:1.4fr .8fr;gap:20px;align-items:stretch}
.quote-stage{background:#fff;border:1px solid var(--c-line);border-radius:12px;padding:28px;min-height:240px;box-shadow:var(--shadow);position:relative}
.quote-stage q{font-size:22px;line-height:1.6;display:block}
.logo-bar{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.logo-bar span{min-height:36px;padding:0 12px;border:1px dashed var(--c-line);border-radius:6px;display:inline-flex;align-items:center;font-size:13px;font-weight:700}
.v-cover{position:relative;border-radius:12px;overflow:hidden;border:1px solid var(--c-line)}
.v-cover img{width:100%;height:100%;min-height:240px;object-fit:cover}
.play{position:absolute;inset:0;display:grid;place-items:center}
.play span{width:64px;height:64px;border-radius:12px;background:rgba(14,20,18,.72);color:#fff;display:grid;place-items:center;font-size:22px}
.news-list{display:grid;gap:16px}
.news{display:grid;grid-template-columns:220px 1fr;gap:18px;background:#fff;border:1px solid var(--c-line);border-radius:12px;overflow:hidden;box-shadow:var(--shadow)}
.news img{width:100%;height:150px;object-fit:cover}
.news-body{padding:16px 16px 16px 0}
.news time{font-size:12px;color:var(--c-muted);font-family:var(--fn)}
.news h3{font-size:18px;margin:4px 0 8px}
.news p{font-size:15px;color:var(--c-muted)}
.more-box{display:none;margin-top:8px;padding:10px 12px;background:var(--c-bg);border-radius:8px;font-size:14px;color:var(--c-ink)}
.news.open .more-box{display:block}
.faq-list{display:grid;gap:10px}
.faq-item{background:#fff;border:1px solid var(--c-line);border-radius:10px;overflow:hidden}
.faq-item button{width:100%;text-align:left;background:#fff;border:0;min-height:52px;padding:12px 16px 12px 18px;font-size:16px;font-weight:700;position:relative}
.faq-item button:before{content:"";position:absolute;left:0;top:10px;bottom:10px;width:3px;background:var(--c-primary)}
.faq-item .ans{display:none;padding:0 18px 16px;color:var(--c-muted);font-size:15px}
.faq-item.open .ans{display:block}
.cta-sec{background:linear-gradient(180deg,#0E1412,#13201A);color:#EAF6F0;padding:88px 0}
.cta-box{display:grid;grid-template-columns:1.1fr .9fr;gap:32px;align-items:start}
.cta-sec h2{color:#fff;font-size:32px}
.form{background:#fff;color:var(--c-ink);border-radius:12px;padding:22px;border:1px solid #223028}
label{display:block;font-size:13px;font-weight:700;margin:0 0 6px}
input,select{width:100%;min-height:46px;border:1px solid var(--c-line);border-radius:12px;padding:0 12px;background:#fff;margin-bottom:14px}
input:focus,select:focus{border-color:var(--c-primary);outline:none;box-shadow:0 0 0 3px rgba(15,191,122,.18)}
.form .btn{width:100%}
.ok{background:rgba(15,191,122,.12);border:1px solid rgba(15,191,122,.35);color:var(--c-primary-d);padding:10px 12px;border-radius:8px;margin-bottom:10px}
.err{background:#FFF4E5;border:1px solid #F0C57A;color:#8A5C00;padding:10px 12px;border-radius:8px;margin-bottom:10px}
.promises{display:grid;gap:12px;margin-top:18px}
.promises li{display:grid;grid-template-columns:28px 1fr;gap:10px;align-items:start}
.promises b{display:block}
.site-footer{background:#121916;color:#B7C4BE;padding:56px 0 20px}
.f-grid{display:grid;grid-template-columns:1.3fr .9fr .9fr 1fr;gap:28px}
.site-footer h3{color:#fff;font-size:16px;margin-bottom:12px}
.site-footer a:hover{color:var(--c-primary)}
.f-copy{margin-top:28px;padding-top:16px;border-top:1px solid #24312B;display:flex;flex-wrap:wrap;gap:10px 18px;justify-content:space-between;font-size:13px}
@media (max-width:1280px){
  .hero-copy h1,.hero-title{font-size:40px}
}
@media (max-width:1024px){
  .nav-links,.nav-cta{display:none}
  .menu-btn{display:flex;margin-left:auto}
  .split,.demo,.story,.case,.cta-box,.voices{grid-template-columns:1fr}
  .prod-grid,.price-grid,.grid-6{grid-template-columns:repeat(2,1fr)}
  .p-card.feature{transform:none}
  .stat-grid{grid-template-columns:repeat(3,1fr)}
  .wall{columns:2}
  .section,.dark-sec,.cta-sec{padding:64px 0}
  .hero,.hero-slide{min-height:560px}
  .f-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:768px){
  .toolbar-right{display:none}
  .hero-copy h1,.hero-title{font-size:30px}
  .section h2,.cta-sec h2{font-size:24px}
  .prod-grid,.price-grid,.grid-6,.stat-grid{grid-template-columns:1fr}
  .price.rec{transform:none}
  .news{grid-template-columns:1fr}
  .news-body{padding:0 16px 16px}
  .side article{grid-template-columns:1fr}
  .side img{width:100%;height:160px}
  .table-wrap table{display:none}
  .m-cards{display:grid;gap:12px}
  .m-card{background:#fff;border:1px solid var(--c-line);border-radius:10px;padding:14px}
  .m-card b{display:block;margin-bottom:6px}
  .wall{columns:1}
  .container{width:min(var(--container),calc(100% - 28px))}
  .hero-copy{padding:56px 0}
}
@media (max-width:520px){
  .stat-grid{grid-template-columns:1fr 1fr}
  .metrics{grid-template-columns:1fr}
  .hero,.hero-slide{min-height:520px}
  .hero-ctrl{left:12px;right:12px;justify-content:space-between}
}