/* roulang page: index */
:root{
  --ink:#241F1C;
  --ink-2:#3A342F;
  --amber:#E25C2A;
  --amber-d:#C44B1F;
  --amber-s:#F4A37A;
  --paper:#F3EEE6;
  --card:#FFFAF6;
  --alt:#E8E2D8;
  --silver:#B9B3A9;
  --brake:#C43C2C;
  --night:#1A1714;
  --warm:#F7F1E8;
  --line:rgba(36,31,28,.12);
  --radius:10px;
  --radius-sm:6px;
  --shadow:0 8px 24px rgba(36,31,28,.08);
  --shadow-h:0 12px 28px rgba(36,31,28,.12);
  --space:88px;
  --space-m:48px;
  --max:1240px;
  --nav:72px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
html,body{margin:0;padding:0}
body{
  font-family:"Noto Sans SC","Source Han Sans SC","Noto Sans CJK SC",sans-serif;
  color:var(--ink);
  background:var(--paper);
  line-height:1.7;
  font-size:16px;
  letter-spacing:.01em;
}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font-family:inherit}
button{cursor:pointer;border:0;background:none}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,p{margin:0}
:focus-visible{outline:2px solid var(--amber);outline-offset:3px}
.skip{position:absolute;left:-999px;top:0}
.skip:focus{left:16px;top:16px;background:#fff;padding:8px 12px;z-index:80}
.container{width:min(100% - 40px,var(--max));margin:0 auto}
.num{font-variant-numeric:tabular-nums;font-feature-settings:"tnum"}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12px;letter-spacing:.18em;color:var(--amber);font-weight:600;
}
.eyebrow::before{content:"";width:18px;height:2px;background:var(--amber)}
.sec{padding:var(--space) 0}
.sec-alt{background:var(--alt)}
.sec-paper{background:var(--paper)}
.sec-card{background:var(--card)}
.sec-head{max-width:760px;margin-bottom:36px}
.sec-head h2{font-size:clamp(26px,3.2vw,40px);line-height:1.25;letter-spacing:-.02em;font-weight:700}
.sec-head p{margin-top:14px;color:var(--ink-2);font-size:16px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:48px;padding:0 22px;border-radius:8px;font-weight:600;font-size:15px;
  transition:transform .2s,background .2s,box-shadow .2s,border-color .2s,color .2s;
}
.btn-primary{background:var(--amber);color:var(--ink);box-shadow:inset 0 -3px 0 rgba(0,0,0,.18)}
.btn-primary:hover,.btn-primary:active{background:var(--amber-d);transform:translateY(-2px)}
.btn-ghost{border:1px solid rgba(255,250,246,.55);color:#FFFAF6;background:transparent}
.btn-ghost:hover{border-color:var(--amber);color:#fff}
.btn-line{border:1px solid var(--ink);color:var(--ink);background:transparent}
.btn-line:hover{border-color:var(--amber);color:var(--amber);transform:translateY(-2px)}
.link{color:var(--ink);border-bottom:1px solid transparent}
.link:hover{border-bottom-color:var(--amber);color:var(--amber)}
.tag{
  display:inline-flex;align-items:center;min-height:28px;padding:0 10px;
  border-radius:4px;background:rgba(226,92,42,.12);color:var(--amber-d);font-size:12px;font-weight:600
}
.tag-risk{background:rgba(196,60,44,.12);color:var(--brake)}
.site-header{position:relative;z-index:50}
.tool-bar{
  background:#EFE8DC;color:var(--ink-2);font-size:12px;min-height:36px;
  display:flex;align-items:center;border-bottom:1px solid var(--line);
  transition:transform .25s,opacity .25s,max-height .25s;
}
.tool-bar.hide{transform:translateY(-100%);opacity:0;max-height:0;overflow:hidden;border:0}
.tool-inner{width:min(100% - 40px,var(--max));margin:0 auto;display:flex;justify-content:space-between;gap:16px;align-items:center;padding:6px 0}
.tool-left,.tool-right{display:flex;flex-wrap:wrap;gap:14px 18px;align-items:center}
.tool-left span,.tool-left a{white-space:nowrap}
.tool-left a{font-weight:700;color:var(--ink)}
.main-nav{
  background:rgba(243,238,230,.94);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);min-height:var(--nav);
  position:sticky;top:0;z-index:49;
}
.nav-inner{width:min(100% - 40px,var(--max));margin:0 auto;display:flex;align-items:center;gap:20px;min-height:var(--nav)}
.logo{display:flex;align-items:center;gap:10px;min-height:44px;flex:0 0 auto}
.logo-mark{
  width:42px;height:28px;border-radius:5px;border:2px solid var(--ink);
  display:grid;place-items:center;font-size:11px;font-weight:800;letter-spacing:.04em;background:#fff
}
.logo-text{display:flex;flex-direction:column;line-height:1.15}
.logo-text strong{font-size:16px;letter-spacing:-.02em}
.logo-text small{font-size:11px;color:var(--ink-2);font-weight:500}
.nav-links{display:flex;align-items:center;gap:4px;margin-left:auto}
.nav-links a{
  min-height:44px;padding:0 12px;display:inline-flex;align-items:center;
  font-size:14px;font-weight:500;color:var(--ink-2);position:relative
}
.nav-links a:hover{color:var(--ink)}
.nav-links a.active{color:var(--ink);font-weight:700}
.nav-links a.active::after,.nav-links a:hover::after{
  content:"";position:absolute;left:12px;right:12px;bottom:8px;height:2px;background:var(--amber)
}
.nav-cta{margin-left:8px}
.burger{
  display:none;width:44px;height:44px;margin-left:auto;border:1px solid var(--line);border-radius:8px;
  align-items:center;justify-content:center;flex-direction:column;gap:5px
}
.burger span{width:18px;height:2px;background:var(--ink);display:block}
.drawer{
  display:none;position:fixed;inset:0;background:rgba(26,23,20,.46);z-index:60
}
.drawer.open{display:block}
.drawer-panel{
  position:absolute;right:0;top:0;bottom:0;width:min(86vw,360px);background:var(--card);
  padding:24px 20px;display:flex;flex-direction:column;gap:6px;box-shadow:var(--shadow-h)
}
.drawer-panel a,.drawer-panel .btn{min-height:48px;display:flex;align-items:center;padding:0 12px;border-radius:8px}
.drawer-panel a:hover,.drawer-panel a:focus{background:var(--alt)}
.hero{position:relative;overflow:hidden;background:var(--night);color:#FFFAF6}
.slides{position:relative;min-height:clamp(460px,58vw,640px);aspect-ratio:2/1}
.slide{
  position:absolute;inset:0;opacity:0;visibility:hidden;transition:opacity .6s ease;
  background:#1A1714 center/cover no-repeat
}
.slide.is-on{opacity:1;visibility:visible;z-index:1}
.slide::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(90deg,rgba(26,23,20,.82) 0%,rgba(26,23,20,.48) 46%,rgba(26,23,20,.18) 100%)
}
.slide-copy{
  position:relative;z-index:2;width:min(100% - 40px,var(--max));margin:0 auto;
  height:100%;display:flex;flex-direction:column;justify-content:flex-end;padding:0 0 72px;max-width:none
}
.slide-copy .inner{max-width:680px}
.slide-copy h1,.slide-copy .h-vis{
  font-size:clamp(32px,5vw,56px);line-height:1.18;letter-spacing:-.03em;font-weight:700
}
.slide-copy p{margin:16px 0 22px;color:#E8E2D8;max-width:560px}
.cta-row{display:flex;flex-wrap:wrap;gap:12px}
.trust-line{margin-top:16px;color:var(--silver);font-size:13px}
.hero-ctrl{position:absolute;z-index:3;inset:auto 16px 20px auto;display:flex;gap:8px}
.hero-ctrl button,.dots button{
  width:44px;height:44px;border-radius:50%;border:1px solid rgba(255,250,246,.3);color:#fff
}
.hero-ctrl button:hover{background:var(--amber);border-color:var(--amber);color:var(--ink)}
.dots{position:absolute;z-index:3;left:50%;bottom:22px;transform:translateX(-50%);display:flex;gap:8px}
.dots button{width:10px;height:10px;min-width:10px;padding:0;border-radius:50%;background:rgba(255,250,246,.35)}
.dots button.on{background:var(--amber);transform:scale(1.2)}
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.cover-frame{position:relative;border-radius:12px;overflow:hidden;box-shadow:var(--shadow)}
.cover-frame img{width:100%;height:100%;object-fit:cover;min-height:420px}
.plate{
  position:absolute;left:16px;bottom:16px;background:var(--card);border:2px solid var(--ink);
  border-radius:8px;padding:8px 12px;font-weight:700;letter-spacing:.08em
}
.check-list{margin-top:18px;display:grid;gap:10px}
.check-list li{
  display:grid;grid-template-columns:18px 1fr;gap:10px;align-items:start;color:var(--ink-2)
}
.check-list li::before{content:"";width:10px;height:10px;margin-top:8px;border:2px solid var(--amber);border-radius:2px}
.bento{display:grid;grid-template-columns:repeat(4,1fr);grid-auto-rows:minmax(150px,auto);gap:16px}
.bento a{
  background:var(--card);border:1px solid var(--line);border-radius:12px;padding:22px;
  display:flex;flex-direction:column;justify-content:space-between;min-height:160px;
  transition:transform .2s,box-shadow .2s,border-color .2s
}
.bento a:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:var(--amber)}
.bento .big{grid-column:span 2;grid-row:span 2;min-height:280px;background:var(--night);color:#FFFAF6;overflow:hidden;position:relative}
.bento .big img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.38}
.bento .big .txt{position:relative;z-index:1}
.bento h3{font-size:22px;margin:8px 0 8px;letter-spacing:-.02em}
.bento p{color:inherit;opacity:.86;font-size:14px}
.ico{
  width:36px;height:36px;border:1px solid var(--silver);border-radius:8px;
  display:grid;place-items:center;font-size:13px;font-weight:800;color:var(--amber)
}
.adv-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.adv-card{
  background:var(--card);border:1px solid var(--line);border-radius:10px;padding:22px 20px;
  box-shadow:0 6px 16px rgba(36,31,28,.05);transition:transform .2s,border-color .2s,box-shadow .2s
}
.adv-card:hover{transform:translateY(-3px);border-color:var(--amber);box-shadow:var(--shadow)}
.adv-card h3{margin:12px 0 8px;font-size:18px}
.adv-card p{color:var(--ink-2);font-size:14px}
.car-stack{display:grid;gap:18px}
.car-card{
  display:grid;grid-template-columns:280px 1fr;background:var(--card);border:1px solid var(--line);
  border-radius:12px;overflow:hidden;transition:transform .2s,border-color .2s,box-shadow .2s
}
.car-card:hover{transform:translateY(-3px);border-color:var(--amber);box-shadow:var(--shadow)}
.car-card img{width:100%;height:100%;object-fit:cover;min-height:190px}
.car-body{padding:20px 22px;display:flex;flex-direction:column;gap:12px}
.car-body h3{font-size:22px}
.fields{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.fields div{background:var(--paper);border:1px dashed var(--silver);border-radius:6px;padding:8px 10px}
.fields b{display:block;font-size:12px;color:var(--ink-2);font-weight:500}
.fields span{font-weight:700;font-variant-numeric:tabular-nums}
.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.metric{background:var(--card);padding:28px 20px;text-align:left}
.metric strong{display:block;font-size:40px;letter-spacing:-.04em;line-height:1;color:var(--amber)}
.metric span{display:block;margin-top:8px;color:var(--ink-2);font-size:14px}
.timeline{display:grid;grid-template-columns:repeat(5,1fr);gap:0;position:relative}
.timeline::before{
  content:"";position:absolute;left:6%;right:6%;top:27px;height:2px;
  background:repeating-linear-gradient(90deg,var(--silver) 0 10px,transparent 10px 18px)
}
.step{padding:0 12px;position:relative}
.step i{
  width:22px;height:22px;border-radius:50%;background:var(--amber);display:grid;place-items:center;
  color:#fff;font-size:12px;font-style:normal;font-weight:700;position:relative;z-index:1
}
.step h3{margin:16px 0 8px;font-size:18px}
.step p{color:var(--ink-2);font-size:14px}
.dark-idea{
  position:relative;background:var(--night);color:#FFFAF6;overflow:hidden;padding:92px 0
}
.dark-idea::before{
  content:"";position:absolute;inset:0;
  background:url("/assets/images/0de7d5ceb097b7c8.webp") center/cover no-repeat;
  opacity:.22
}
.dark-idea::after{
  content:"";position:absolute;left:8%;right:8%;bottom:28px;height:2px;
  background:repeating-linear-gradient(90deg,rgba(185,179,169,.7) 0 16px,transparent 16px 28px)
}
.dark-grid{position:relative;z-index:1;display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
.glow{
  position:absolute;width:180px;height:80px;right:12%;top:18%;border-radius:50%;
  background:radial-gradient(circle,rgba(226,92,42,.28),transparent 70%);filter:blur(8px)
}
.slice{border:1px solid rgba(185,179,169,.35);border-radius:4px;padding:18px;margin-bottom:12px;background:rgba(26,23,20,.55)}
.slice h3{font-size:18px;margin-bottom:8px}
.masonry{columns:3;column-gap:16px}
.case-card{
  break-inside:avoid;margin-bottom:16px;background:var(--card);border:1px solid var(--line);
  border-radius:10px;overflow:hidden;transition:transform .2s,border-color .2s
}
.case-card:hover{transform:translateY(-3px);border-color:var(--amber)}
.case-card img{width:100%;height:180px;object-fit:cover}
.case-card .pad{padding:14px 16px 18px}
.case-card h3{font-size:16px;margin:6px 0}
.story{display:grid;grid-template-columns:1.4fr .8fr;gap:16px}
.story-main{position:relative;border-radius:12px;overflow:hidden;min-height:360px}
.story-main img{width:100%;height:100%;object-fit:cover;min-height:360px}
.quote{
  position:absolute;left:0;right:0;bottom:0;padding:24px;
  background:linear-gradient(180deg,transparent,rgba(26,23,20,.88));color:#fff
}
.quote p{font-size:18px;line-height:1.6}
.side-story{display:grid;gap:16px}
.side-story article{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:18px}
.statbar{background:var(--night);color:#FFFAF6;padding:42px 0}
.statbar .row{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.statbar strong{display:block;font-size:36px;color:var(--amber);letter-spacing:-.03em}
.reviews{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:16px;overflow:auto;scroll-snap-type:x mandatory;padding-bottom:8px}
.rev{
  min-width:260px;scroll-snap-align:start;background:var(--card);border:1px solid var(--line);
  border-radius:12px;padding:20px;display:flex;flex-direction:column;gap:10px
}
.stars{color:var(--amber);letter-spacing:2px}
.news-grid{display:grid;grid-template-columns:1.3fr 1fr;gap:16px}
.news-card{display:grid;grid-template-columns:140px 1fr;gap:14px;background:var(--card);border:1px solid var(--line);border-radius:10px;overflow:hidden}
.news-card img{width:140px;height:100%;object-fit:cover;min-height:120px}
.news-card .pad{padding:14px 14px 14px 0}
.news-card time{font-size:12px;color:var(--silver)}
.news-card h3{font-size:16px;margin:4px 0 8px}
.news-card p{font-size:14px;color:var(--ink-2)}
.news-featured{grid-row:span 3;display:block}
.news-featured img{width:100%;height:220px;object-fit:cover}
.news-featured .pad{padding:18px}
.logos{display:grid;grid-template-columns:repeat(6,1fr);gap:12px}
.logo-cell{
  min-height:76px;border:1px solid var(--line);border-radius:8px;display:grid;place-items:center;
  background:var(--card);filter:grayscale(1);opacity:.78;font-weight:700;color:var(--ink-2);transition:.2s
}
.logo-cell:hover{filter:none;opacity:1;color:var(--amber);border-color:var(--amber)}
.faq{display:grid;gap:10px}
.faq-item{border:1px solid var(--line);border-radius:8px;background:var(--card);overflow:hidden}
.faq-item button{
  width:100%;text-align:left;min-height:56px;padding:14px 48px 14px 18px;font-size:16px;font-weight:600;position:relative
}
.faq-item button::after{
  content:"";position:absolute;right:18px;top:50%;width:10px;height:10px;border-right:2px solid var(--ink);border-bottom:2px solid var(--ink);
  transform:translateY(-70%) rotate(45deg);transition:transform .2s
}
.faq-item.open button::after{transform:translateY(-30%) rotate(225deg)}
.faq-item .ans{display:none;padding:0 18px 16px;color:var(--ink-2)}
.faq-item.open .ans{display:block}
.guard{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:28px}
.badge{
  background:var(--card);border:1px solid var(--line);border-radius:10px;padding:16px;
  display:flex;gap:10px;align-items:flex-start
}
.badge b{display:block;margin-bottom:4px}
.cta-box{
  background:var(--night);color:#FFFAF6;border-radius:12px;padding:28px;
  display:grid;grid-template-columns:1.1fr .9fr;gap:28px;position:relative;overflow:hidden
}
.cta-box::before{
  content:"";position:absolute;right:-40px;top:-40px;width:180px;height:180px;border-radius:50%;
  background:radial-gradient(circle,rgba(226,92,42,.35),transparent 70%)
}
.form{display:grid;grid-template-columns:1fr 1fr;gap:12px;position:relative;z-index:1}
.form .full{grid-column:1/-1}
label{display:block;font-size:13px;margin-bottom:6px;color:#E8E2D8}
input,select,textarea{
  width:100%;min-height:44px;border:1px solid rgba(185,179,169,.45);background:#241F1C;color:#FFFAF6;
  border-radius:8px;padding:10px 12px
}
textarea{min-height:96px;resize:vertical}
input:focus,select:focus,textarea:focus{border-color:var(--amber);box-shadow:0 0 0 3px rgba(226,92,42,.25);outline:none}
.form-msg{display:none;grid-column:1/-1;padding:10px 12px;border-radius:8px;background:rgba(226,92,42,.16);color:#fff}
.form-msg.show{display:block}
.side-info{position:relative;z-index:1;border-left:1px solid rgba(185,179,169,.25);padding-left:22px}
.side-info p{margin:8px 0;color:#E8E2D8}
.site-footer{background:#161310;color:#E8E2D8;padding:56px 0 24px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:28px}
.site-footer h3{color:#FFFAF6;font-size:16px;margin-bottom:12px}
.site-footer a{display:inline-block;min-height:32px;color:#C9C2B6}
.site-footer a:hover{color:var(--amber);text-decoration:underline}
.copy{margin-top:28px;padding-top:18px;border-top:1px solid rgba(185,179,169,.18);display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:13px;color:var(--silver)}
@media (max-width:1200px){
  .bento{grid-template-columns:repeat(2,1fr)}
  .fields{grid-template-columns:repeat(2,1fr)}
  .logos{grid-template-columns:repeat(4,1fr)}
}
@media (max-width:992px){
  :root{--space:64px}
  .nav-links,.nav-cta{display:none}
  .burger{display:flex}
  .split,.dark-grid,.story,.cta-box,.news-grid,.foot-grid{grid-template-columns:1fr}
  .slides{aspect-ratio:auto;min-height:520px}
  .adv-grid,.guard,.statbar .row,.metrics{grid-template-columns:repeat(2,1fr)}
  .timeline{grid-template-columns:1fr;gap:18px}
  .timeline::before{left:22px;right:auto;top:8px;bottom:8px;width:2px;height:auto;background:repeating-linear-gradient(180deg,var(--silver) 0 10px,transparent 10px 18px)}
  .masonry{columns:2}
  .car-card{grid-template-columns:1fr}
  .side-info{border-left:0;padding-left:0;border-top:1px solid rgba(185,179,169,.25);padding-top:18px}
}
@media (max-width:768px){
  :root{--space:48px}
  .container,.tool-inner,.nav-inner,.slide-copy{width:min(100% - 24px,var(--max))}
  .tool-inner{flex-direction:column;align-items:flex-start}
  .bento,.adv-grid,.guard,.metrics,.statbar .row,.reviews,.logos{grid-template-columns:1fr}
  .bento .big{grid-column:span 1}
  .form{grid-template-columns:1fr}
  .news-card{grid-template-columns:1fr}
  .news-card img{width:100%;height:160px}
  .copy{flex-direction:column}
}
@media (max-width:375px){
  body{overflow-x:hidden}
  .slide-copy h1,.slide-copy .h-vis{font-size:28px}
  .btn,.nav-links a,.drawer-panel a{min-height:44px}
  .masonry{columns:1}
}