/* roulang page: index */
:root{
  --ink:#0F2B26;
  --ink-2:#16453C;
  --clay:#A9491F;
  --clay-dark:#8C3A16;
  --sand:#EBD9C4;
  --canvas:#F5F1E8;
  --layer:#F0EBDF;
  --card:#FFFCF6;
  --text:#1C2420;
  --text-2:#5A615C;
  --text-3:#8A908B;
  --line:rgba(15,43,38,0.12);
  --line-strong:rgba(15,43,38,0.22);
  --line-accent:rgba(169,73,31,0.28);
  --ok:#2F6B4F;
  --disabled:#C9C4B8;
  --radius-pill:999px;
  --radius-card:16px;
  --radius-media:12px;
  --radius-input:10px;
  --radius-badge:6px;
  --shadow-hover:0 18px 40px -28px rgba(15,43,38,0.45);
  --container:1200px;
  --ease:180ms ease;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--canvas);
  color:var(--text);
  font-family:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button{font-family:inherit;cursor:pointer;}
ul,ol{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4,p,dl,dd,figure{margin:0;}
h1,h2,h3,h4{line-height:1.3;font-weight:600;}
:focus-visible{outline:2px solid var(--ink);outline-offset:2px;border-radius:4px;}
.container{
  width:100%;
  max-width:var(--container);
  margin:0 auto;
  padding:0 24px;
}
.section{padding:96px 0;}
.section--line{border-top:1px solid var(--line);}
.section-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:32px;
  margin-bottom:48px;
}
.section-title{
  font-size:clamp(24px,3vw,32px);
  letter-spacing:0.01em;
  color:var(--ink);
}
.section-sub{
  margin-top:12px;
  font-size:15px;
  color:var(--text-2);
  max-width:620px;
}
.text-cta{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:15px;
  font-weight:500;
  color:var(--ink);
  white-space:nowrap;
  padding-bottom:2px;
  border-bottom:1px solid transparent;
  transition:border-color var(--ease),color var(--ease);
}
.text-cta .arrow{transition:transform var(--ease);}
.text-cta:hover{border-bottom-color:var(--ink);}
.text-cta:hover .arrow{transform:translateX(3px);}

/* 按钮 */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:52px;
  padding:0 32px;
  border-radius:var(--radius-pill);
  border:1px solid transparent;
  font-size:15px;
  font-weight:600;
  letter-spacing:0.01em;
  transition:background var(--ease),color var(--ease),transform var(--ease),box-shadow var(--ease),border-color var(--ease);
}
.btn-primary{background:var(--clay);color:var(--card);}
.btn-primary:hover{background:var(--clay-dark);transform:translateY(-1px);box-shadow:var(--shadow-hover);}
.btn-primary:active{transform:translateY(0);box-shadow:none;}
.btn-ghost{background:transparent;border-color:var(--ink);color:var(--ink);}
.btn-ghost:hover{background:var(--ink);color:var(--canvas);}
.btn-ghost:active{background:var(--ink-2);}
.btn-sm{height:40px;padding:0 22px;font-size:14px;}
.btn[disabled],.btn.is-disabled{background:var(--disabled);color:#fff;border-color:var(--disabled);cursor:not-allowed;box-shadow:none;transform:none;}

/* 导航 */
.site-header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:100;
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background var(--ease),border-color var(--ease),backdrop-filter var(--ease);
}
.site-header.is-scrolled{
  background:rgba(245,241,232,0.94);
  backdrop-filter:blur(10px);
  border-bottom-color:var(--line);
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  height:78px;
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  color:var(--ink);
}
.brand-mark{display:inline-flex;width:30px;height:30px;color:var(--ink);}
.brand-mark svg{width:100%;height:100%;}
.brand-text{
  font-size:18px;
  font-weight:600;
  letter-spacing:0.04em;
}
.nav{
  display:flex;
  align-items:center;
  gap:34px;
}
.nav-link{
  position:relative;
  font-size:15px;
  font-weight:500;
  letter-spacing:0.02em;
  color:var(--text);
  padding:6px 0;
  transition:color var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  background:var(--ink);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform 200ms ease;
}
.nav-link:hover::after{transform:scaleX(1);}
.nav-link.is-active::after{transform:scaleX(1);}
.nav-link.is-active{color:var(--ink);font-weight:600;}
.header-actions{display:flex;align-items:center;gap:18px;}
.header-divider{width:1px;height:22px;background:var(--line-strong);}
.nav-toggle{
  display:none;
  width:44px;height:44px;
  align-items:center;
  justify-content:center;
  flex-direction:column;
  gap:5px;
  background:transparent;
  border:1px solid var(--line-strong);
  border-radius:var(--radius-pill);
  padding:0;
}
.nav-toggle span{
  display:block;
  width:18px;height:1px;
  background:var(--ink);
  transition:transform var(--ease),opacity var(--ease);
}
.nav-toggle.is-open span:nth-child(1){transform:translateY(6px) rotate(45deg);}
.nav-toggle.is-open span:nth-child(2){opacity:0;}
.nav-toggle.is-open span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}

/* Hero */
.hero{
  padding:150px 0 80px;
  background:linear-gradient(180deg,var(--canvas) 0%,var(--canvas) 72%,var(--layer) 100%);
}
.hero-grid{
  display:grid;
  grid-template-columns:7fr 5fr;
  gap:56px;
  align-items:center;
}
.hero-badge{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:7px 14px;
  border:1px solid var(--line-strong);
  border-radius:var(--radius-badge);
  font-size:12px;
  letter-spacing:0.02em;
  color:var(--text-2);
  background:rgba(255,252,246,0.6);
}
.hero-badge .dot{
  width:6px;height:6px;
  border-radius:50%;
  background:var(--clay);
  display:inline-block;
}
.hero h1{
  margin:24px 0 18px;
  font-size:clamp(30px,4.2vw,46px);
  line-height:1.22;
  letter-spacing:0.01em;
  color:var(--ink);
}
.hero-sub{
  font-size:17px;
  line-height:1.85;
  color:var(--text-2);
  max-width:620px;
}
.download-group{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin:32px 0 18px;
}
.dl-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  height:48px;
  padding:0 24px;
  border-radius:var(--radius-pill);
  border:1px solid var(--ink);
  background:transparent;
  color:var(--ink);
  font-size:14px;
  font-weight:600;
  transition:background var(--ease),color var(--ease),border-color var(--ease),transform var(--ease),box-shadow var(--ease);
}
.dl-btn svg{width:18px;height:18px;flex:none;}
.dl-btn:hover{background:var(--ink);color:var(--canvas);transform:translateY(-1px);}
.dl-btn:active{transform:translateY(0);}
.dl-btn.is-primary{background:var(--clay);border-color:var(--clay);color:var(--card);}
.dl-btn.is-primary:hover{background:var(--clay-dark);border-color:var(--clay-dark);box-shadow:var(--shadow-hover);}
.micro{
  font-size:12px;
  line-height:1.7;
  color:var(--text-3);
  font-variant-numeric:tabular-nums;
  letter-spacing:0.01em;
}
.hero-visual{display:flex;flex-direction:column;gap:16px;}
.hero-figure{
  position:relative;
  border:1px solid var(--line);
  border-radius:var(--radius-media);
  overflow:hidden;
  background:var(--card);
}
.hero-figure img{
  width:100%;
  aspect-ratio:4/3;
  object-fit:cover;
}
.hero-tag{
  position:absolute;
  top:0;left:0;
  padding:6px 14px;
  background:rgba(15,43,38,0.88);
  color:var(--canvas);
  font-size:12px;
  letter-spacing:0.02em;
  border-bottom-right-radius:8px;
}
.qr-card{
  display:flex;
  align-items:center;
  gap:16px;
  padding:14px 18px;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:8px;
}
.qr-card svg{width:66px;height:66px;flex:none;border-radius:4px;}
.qr-copy strong{display:block;font-size:14px;font-weight:600;color:var(--ink);}
.qr-copy span{display:block;margin-top:4px;font-size:12px;color:var(--text-3);line-height:1.6;}

/* 价值条 */
.value-row{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.value-item{
  padding:34px 26px 34px 0;
  border-right:1px solid var(--line);
}
.value-item:last-child{border-right:0;}
.value-num{
  display:block;
  font-size:30px;
  font-weight:600;
  line-height:1;
  color:var(--clay);
  font-variant-numeric:tabular-nums;
  letter-spacing:0.02em;
  margin-bottom:16px;
}
.value-item h3{font-size:17px;color:var(--ink);margin-bottom:8px;}
.value-item p{font-size:14px;line-height:1.75;color:var(--text-2);}

/* 轮播 */
.rail-wrap{position:relative;}
.rail{
  display:flex;
  gap:24px;
  overflow-x:auto;
  scroll-snap-type:x mandatory;
  padding-bottom:8px;
  scrollbar-width:none;
  -ms-overflow-style:none;
}
.rail::-webkit-scrollbar{display:none;}
.rail-card{
  flex:0 0 380px;
  scroll-snap-align:start;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  padding:14px 14px 20px;
  transition:border-color var(--ease),transform var(--ease),box-shadow var(--ease);
}
.rail-card:hover{border-color:var(--line-strong);transform:translateY(-2px);box-shadow:var(--shadow-hover);}
.rail-card img{
  width:100%;
  aspect-ratio:16/10;
  object-fit:cover;
  border-radius:var(--radius-media);
  background:var(--layer);
}
.rail-card p{
  margin-top:14px;
  font-size:14px;
  line-height:1.7;
  color:var(--text-2);
  padding:0 6px;
}
.rail-card strong{display:block;font-size:16px;color:var(--ink);margin-bottom:4px;padding:0 6px;}
.rail-nav{display:flex;gap:10px;}
.rail-btn{
  width:36px;height:36px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border-radius:50%;
  border:1px solid var(--line-strong);
  background:transparent;
  color:var(--ink);
  transition:background var(--ease),color var(--ease),border-color var(--ease),opacity var(--ease);
}
.rail-btn:hover{background:var(--ink);color:var(--canvas);border-color:var(--ink);}
.rail-btn[disabled]{opacity:0.35;cursor:not-allowed;background:transparent;color:var(--ink);border-color:var(--line);}
.rail-btn svg{width:15px;height:15px;}
.rail-dots{
  display:flex;
  gap:8px;
  margin-top:24px;
  align-items:center;
}
.rail-dot{
  width:8px;height:4px;
  border:0;
  padding:0;
  border-radius:2px;
  background:var(--line-strong);
  transition:width var(--ease),background var(--ease);
}
.rail-dot.is-active{width:20px;background:var(--clay);}

/* 系统要求 */
.platform-tabs{
  display:inline-flex;
  padding:5px;
  gap:4px;
  border:1px solid var(--line);
  border-radius:var(--radius-pill);
  background:var(--layer);
  margin-bottom:36px;
}
.platform-tab{
  border:0;
  background:transparent;
  padding:9px 22px;
  border-radius:var(--radius-pill);
  font-size:14px;
  font-weight:500;
  color:var(--text-2);
  transition:background var(--ease),color var(--ease);
}
.platform-tab:hover{color:var(--ink);}
.platform-tab.is-active{background:var(--card);color:var(--ink);font-weight:600;box-shadow:0 2px 8px -4px rgba(15,43,38,0.3);}
.spec-panels{position:relative;}
.spec-panel{display:none;}
.spec-panel.is-active{display:block;}
.spec-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:0 56px;
}
.spec-col h3{
  font-size:14px;
  font-weight:600;
  letter-spacing:0.04em;
  color:var(--clay);
  padding-bottom:14px;
  border-bottom:1px solid var(--line-accent);
}
.spec-row{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  min-height:48px;
  border-bottom:1px solid var(--line);
}
.spec-row dt{font-size:14px;color:var(--text-2);}
.spec-row dd{font-size:15px;font-weight:500;color:var(--ink);text-align:right;}
.spec-foot{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  margin-top:28px;
  flex-wrap:wrap;
}

/* 评价墙 */
.review-wall{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:24px;
  align-items:start;
}
.review-col{display:flex;flex-direction:column;gap:24px;}
.review-col--offset{padding-top:56px;}
.review-card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  padding:26px 24px 20px;
  position:relative;
  transition:border-color var(--ease),transform var(--ease),box-shadow var(--ease);
}
.review-card:hover{border-color:var(--line-strong);transform:translateY(-2px);box-shadow:var(--shadow-hover);}
.quote-mark{
  display:block;
  font-size:32px;
  line-height:1;
  color:rgba(169,73,31,0.28);
  font-family:Georgia,serif;
  margin-bottom:10px;
}
.review-card p{font-size:15px;line-height:1.85;color:var(--text-2);}
.review-meta{
  display:flex;
  align-items:center;
  gap:12px;
  margin-top:20px;
  padding-top:16px;
  border-top:1px solid var(--line);
}
.avatar{
  width:40px;height:40px;
  border-radius:50%;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  font-size:15px;
  font-weight:600;
  color:var(--ink);
  background:var(--sand);
  flex:none;
}
.review-name{font-size:14px;font-weight:600;color:var(--ink);}
.review-platform{font-size:12px;color:var(--text-3);}
.rating{
  display:flex;
  gap:5px;
  margin-left:auto;
}
.rating i{
  width:8px;height:8px;
  border-radius:50%;
  background:var(--line-strong);
  display:block;
}
.rating i.on{background:var(--clay);}

/* 资讯 */
.news-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:24px;
}
.news-card{
  display:flex;
  flex-direction:column;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  padding:24px;
  transition:border-color var(--ease),transform var(--ease),box-shadow var(--ease);
}
.news-card:hover{border-color:var(--line-strong);transform:translateY(-2px);box-shadow:var(--shadow-hover);}
.badge{
  align-self:flex-start;
  display:inline-block;
  padding:4px 10px;
  border-radius:var(--radius-badge);
  background:var(--sand);
  color:var(--clay-dark);
  font-size:11px;
  font-weight:600;
  letter-spacing:0.03em;
  line-height:1.5;
}
.news-title{
  margin:14px 0 10px;
  font-size:17px;
  line-height:1.45;
  color:var(--ink);
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
}
.news-excerpt{
  font-size:14px;
  line-height:1.7;
  color:var(--text-2);
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
  min-height:47px;
}
.news-foot{
  display:flex;
  align-items:center;
  justify-content:space-between;
  margin-top:20px;
  padding-top:14px;
  border-top:1px solid var(--line);
  font-size:12px;
  color:var(--text-3);
  font-variant-numeric:tabular-nums;
}
.news-arrow{color:var(--ink);transition:transform var(--ease);}
.news-card:hover .news-arrow{transform:translateX(3px);}
.empty-state{
  border:1px dashed var(--line-strong);
  border-radius:var(--radius-card);
  min-height:200px;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:16px;
  text-align:center;
  color:var(--text-2);
  font-size:15px;
  padding:32px 24px;
}

/* FAQ */
.faq-list{max-width:860px;}
.faq-item{border-bottom:1px solid var(--line);}
.faq-item:first-child{border-top:1px solid var(--line);}
.faq-q{
  width:100%;
  min-height:64px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  background:transparent;
  border:0;
  padding:16px 0;
  text-align:left;
  font-size:17px;
  font-weight:600;
  color:var(--ink);
  transition:color var(--ease);
}
.faq-q:hover{color:var(--clay);}
.faq-icon{
  position:relative;
  width:16px;height:16px;
  flex:none;
  transition:transform var(--ease);
}
.faq-icon::before,.faq-icon::after{
  content:"";
  position:absolute;
  background:var(--ink);
  border-radius:1px;
}
.faq-icon::before{left:0;top:7.5px;width:16px;height:1px;}
.faq-icon::after{left:7.5px;top:0;width:1px;height:16px;}
.faq-item.is-open .faq-icon{transform:rotate(45deg);}
.faq-a{
  max-height:0;
  overflow:hidden;
  transition:max-height 260ms ease;
}
.faq-a-inner{
  max-width:720px;
  padding:0 0 20px;
  font-size:15px;
  line-height:1.85;
  color:var(--text-2);
}

/* 下载区块 */
.download-band{
  background:var(--layer);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  padding:76px 0;
}
.band-grid{
  display:grid;
  grid-template-columns:7fr 5fr;
  gap:56px;
  align-items:center;
}
.band-grid h2{
  font-size:clamp(24px,3vw,32px);
  color:var(--ink);
  letter-spacing:0.01em;
}
.band-grid p{
  margin-top:14px;
  font-size:16px;
  line-height:1.85;
  color:var(--text-2);
  max-width:560px;
}
.band-grid .download-group{margin-bottom:12px;}
.band-qr{
  display:flex;
  align-items:center;
  gap:18px;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  padding:22px;
}
.band-qr svg{width:104px;height:104px;flex:none;}
.band-qr strong{display:block;font-size:15px;color:var(--ink);}
.band-qr span{display:block;margin-top:8px;font-size:13px;line-height:1.7;color:var(--text-3);}

/* 页脚 */
.site-footer{
  background:var(--ink);
  color:var(--canvas);
  padding:72px 0 0;
}
.footer-grid{
  display:grid;
  grid-template-columns:4fr 2fr 3fr 3fr;
  gap:40px;
  padding-bottom:52px;
}
.footer-brand .brand{color:var(--canvas);}
.footer-brand .brand-mark{color:var(--canvas);}
.footer-brand p{
  margin-top:18px;
  font-size:14px;
  line-height:1.85;
  color:rgba(245,241,232,0.72);
  max-width:320px;
}
.footer-title{
  font-size:13px;
  font-weight:600;
  letter-spacing:0.08em;
  color:rgba(245,241,232,0.55);
  margin-bottom:18px;
}
.footer-list li{margin-bottom:12px;}
.footer-list a{
  font-size:14px;
  color:rgba(245,241,232,0.86);
  transition:color var(--ease);
}
.footer-list a:hover{color:var(--clay);}
.footer-list span{font-size:14px;color:rgba(245,241,232,0.86);}
.footer-band{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  border:1px solid rgba(245,241,232,0.24);
  border-radius:var(--radius-card);
  padding:20px 24px;
  flex-wrap:wrap;
}
.footer-band p{font-size:14px;color:rgba(245,241,232,0.86);}
.footer-band .btn{height:44px;padding:0 26px;font-size:14px;}
.footer-bottom{
  margin-top:40px;
  border-top:1px solid rgba(245,241,232,0.18);
  padding:22px 0 28px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  flex-wrap:wrap;
  font-size:12px;
  color:rgba(245,241,232,0.62);
}
.footer-bottom nav{display:flex;gap:20px;flex-wrap:wrap;}
.footer-bottom a{color:rgba(245,241,232,0.72);}
.footer-bottom a:hover{color:var(--clay);}

@media (max-width:1279px){
  .container{max-width:1100px;}
}
@media (max-width:1023px){
  .section{padding:72px 0;}
  .hero{padding:132px 0 64px;}
  .hero-grid{grid-template-columns:1fr;gap:40px;}
  .hero-sub{max-width:none;}
  .hero-visual{max-width:560px;}
  .nav{gap:22px;}
  .value-row{grid-template-columns:repeat(2,1fr);}
  .value-item:nth-child(2){border-right:0;}
  .value-item:nth-child(1),.value-item:nth-child(2){border-bottom:1px solid var(--line);}
  .spec-grid{grid-template-columns:1fr;gap:40px;}
  .rail-card{flex:0 0 320px;}
  .news-grid{grid-template-columns:repeat(2,1fr);}
  .band-grid{grid-template-columns:1fr;gap:32px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:36px;}
}
@media (max-width:767px){
  .container{padding:0 20px;}
  .section{padding:56px 0;}
  .section-head{flex-direction:column;align-items:flex-start;gap:16px;margin-bottom:32px;}
  .header-inner{height:70px;}
  .header-divider{display:none;}
  .header-actions .btn-sm{height:38px;padding:0 18px;font-size:13px;}
  .nav-toggle{display:inline-flex;}
  .nav{
    position:fixed;
    top:70px;left:0;right:0;bottom:0;
    background:var(--canvas);
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:8px 20px 32px;
    display:none;
    overflow-y:auto;
    border-top:1px solid var(--line);
  }
  .nav.is-open{display:flex;}
  .nav-link{
    font-size:18px;
    line-height:56px;
    padding:0;
    border-bottom:1px solid var(--line);
  }
  .nav-link::after{display:none;}
  .nav-link.is-active{color:var(--clay);}
  .hero{padding:112px 0 56px;}
  .hero h1{font-size:30px;}
  .hero-sub{font-size:16px;}
  .download-group .dl-btn{flex:1 1 100%;}
  .value-row{grid-template-columns:1fr;}
  .value-item{border-right:0;border-bottom:1px solid var(--line);padding:26px 0;}
  .value-item:last-child{border-bottom:0;}
  .value-num{font-size:26px;margin-bottom:12px;}
  .rail-card{flex:0 0 78vw;}
  .review-wall{grid-template-columns:1fr;}
  .review-col--offset{padding-top:0;}
  .news-grid{grid-template-columns:1fr;}
  .band-grid h2{font-size:24px;}
  .band-qr{flex-direction:row;}
  .footer-grid{grid-template-columns:1fr;gap:32px;padding-bottom:40px;}
  .site-footer{padding-top:56px;}
  .footer-band{flex-direction:column;align-items:flex-start;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
}
@media (max-width:400px){
  .header-actions .btn-sm{display:none;}
  .band-qr{flex-direction:column;align-items:flex-start;}
  .btn{width:100%;}
  .dl-btn{width:100%;}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:0.01ms !important;transition-duration:0.01ms !important;scroll-behavior:auto !important;}
}

/* roulang page: category1 */
:root{
  --ink:#0F2B26;
  --ink-hover:#0A1F1B;
  --ink-2:#16453C;
  --accent:#A9491F;
  --accent-hover:#8C3A16;
  --accent-soft:#EBD9C4;
  --canvas:#F5F1E8;
  --layer:#F0EBDF;
  --card:#FFFCF6;
  --text:#1C2420;
  --text-2:#5A615C;
  --text-3:#8A908B;
  --line:rgba(15,43,38,.12);
  --line-accent:rgba(169,73,31,.28);
  --success:#2F6B4F;
  --disabled:#C9C4B8;
  --r-btn:999px;
  --r-card:16px;
  --r-img:12px;
  --r-input:10px;
  --r-badge:6px;
  --shadow-hover:0 18px 40px -28px rgba(15,43,38,.45);
  --header-h:76px;
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  font-size:16px;
  line-height:1.8;
  color:var(--text);
  background:var(--canvas);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border-style:none;}
a{color:inherit;text-decoration:none;}
button{font-family:inherit;font-size:inherit;color:inherit;}
h1,h2,h3,h4,p,ul,ol,dl,dd,figure{margin:0;}
ul,ol{padding:0;list-style:none;}
svg{display:block;}
:focus-visible{outline:2px solid var(--ink);outline-offset:2px;border-radius:4px;}

.container{
  width:100%;
  max-width:1200px;
  margin:0 auto;
  padding:0 24px;
}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:52px;
  padding:0 32px;
  border-radius:var(--r-btn);
  border:1px solid transparent;
  font-size:16px;
  font-weight:600;
  letter-spacing:.01em;
  cursor:pointer;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease,transform .18s ease,box-shadow .18s ease;
  white-space:nowrap;
}
.btn-primary{
  background:var(--accent);
  color:#F5F1E8;
  border-color:var(--accent);
}
.btn-primary:hover{background:var(--accent-hover);border-color:var(--accent-hover);transform:translateY(-1px);box-shadow:var(--shadow-hover);}
.btn-primary:active{transform:translateY(0);box-shadow:none;background:var(--accent-hover);}
.btn-primary:disabled{background:var(--disabled);border-color:var(--disabled);color:#F5F1E8;cursor:not-allowed;transform:none;box-shadow:none;}
.btn-ghost{
  background:transparent;
  color:var(--ink);
  border-color:var(--ink);
}
.btn-ghost:hover{background:var(--ink);color:#F5F1E8;transform:translateY(-1px);}
.btn-ghost:active{transform:translateY(0);background:var(--ink-hover);border-color:var(--ink-hover);}
.btn-sm{height:42px;padding:0 22px;font-size:14px;}
.btn-link{
  display:inline-flex;
  align-items:center;
  gap:6px;
  color:var(--ink);
  font-size:15px;
  font-weight:600;
  border-bottom:1px solid transparent;
  padding-bottom:2px;
  transition:border-color .18s ease,color .18s ease;
}
.btn-link .arrow{transition:transform .18s ease;}
.btn-link:hover{border-bottom-color:var(--ink);}
.btn-link:hover .arrow{transform:translateX(3px);}

/* ============ 头部导航 ============ */
.site-header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:90;
  background:transparent;
  transition:background-color .25s ease,box-shadow .25s ease,border-color .25s ease;
  border-bottom:1px solid transparent;
}
.site-header.is-scrolled{
  background:rgba(245,241,232,.93);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border-bottom-color:var(--line);
}
.header-inner{
  display:flex;
  align-items:center;
  gap:28px;
  height:var(--header-h);
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex-shrink:0;
}
.brand-mark{
  width:32px;height:32px;
  color:var(--ink);
  display:flex;align-items:center;justify-content:center;
}
.brand-mark svg{width:32px;height:32px;}
.brand-text{
  font-size:18px;
  font-weight:600;
  letter-spacing:.04em;
  color:var(--ink);
}
.nav{
  display:flex;
  align-items:center;
  gap:26px;
  margin-left:auto;
}
.nav-link{
  position:relative;
  font-size:15px;
  font-weight:500;
  letter-spacing:.02em;
  color:var(--text-2);
  padding:6px 0;
  transition:color .18s ease;
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  background:var(--ink);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .2s ease;
}
.nav-link:hover{color:var(--ink);}
.nav-link:hover::after{transform:scaleX(1);}
.nav-link.is-active{color:var(--ink);font-weight:600;}
.nav-link.is-active::after{transform:scaleX(1);}
.header-actions{
  display:flex;
  align-items:center;
  gap:18px;
  flex-shrink:0;
}
.header-divider{
  width:1px;height:22px;
  background:var(--line);
}
.nav-toggle{
  display:none;
  width:44px;height:44px;
  padding:0;
  background:none;
  border:0;
  cursor:pointer;
  position:relative;
  align-items:center;
  justify-content:center;
  flex-direction:column;
  gap:5px;
}
.nav-toggle span{
  display:block;
  width:22px;height:1px;
  background:var(--ink);
  transition:transform .22s ease,opacity .22s ease;
}

/* ============ 首屏 ============ */
.hero{
  position:relative;
  padding:calc(var(--header-h) + 64px) 0 64px;
  background-color:var(--layer);
  background-image:linear-gradient(100deg,rgba(245,241,232,.97) 0%,rgba(245,241,232,.92) 52%,rgba(245,241,232,.72) 100%),url("/assets/images/backpic/back-1.webp");
  background-size:cover;
  background-position:center right;
  background-repeat:no-repeat;
  border-bottom:1px solid var(--line);
}
.hero-inner{
  max-width:780px;
}
.badge{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:12px;
  line-height:1.6;
  letter-spacing:.04em;
  color:var(--ink-2);
  background:var(--accent-soft);
  border:1px solid var(--line-accent);
  border-radius:var(--r-badge);
  padding:4px 10px;
}
.badge .dot{
  width:6px;height:6px;border-radius:50%;
  background:var(--accent);
  flex-shrink:0;
}
.hero h1{
  margin:20px 0 0;
  font-size:clamp(30px,4.2vw,46px);
  line-height:1.22;
  font-weight:600;
  letter-spacing:.01em;
  color:var(--ink);
}
.hero-lead{
  margin-top:18px;
  font-size:17px;
  line-height:1.85;
  color:var(--text-2);
  max-width:700px;
}
.hero-actions{
  margin-top:30px;
  display:flex;
  flex-wrap:wrap;
  gap:14px;
}
.hero-meta{
  margin-top:18px;
  font-size:12px;
  line-height:1.6;
  color:var(--text-3);
  font-variant-numeric:tabular-nums;
}
.hero-meta span + span::before{
  content:"·";
  margin:0 8px;
  color:var(--text-3);
}

/* ============ 事实条 ============ */
.facts{
  border-bottom:1px solid var(--line);
  background:var(--canvas);
}
.facts-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:0;
}
.fact{
  padding:26px 24px 26px 0;
  border-right:1px solid var(--line);
}
.fact:last-child{border-right:0;padding-right:0;}
.fact:not(:first-child){padding-left:24px;}
.fact-num{
  font-size:30px;
  font-weight:600;
  line-height:1.2;
  color:var(--ink);
  font-variant-numeric:tabular-nums;
  letter-spacing:.01em;
}
.fact-num em{
  font-style:normal;
  font-size:15px;
  font-weight:500;
  color:var(--text-2);
  margin-left:4px;
}
.fact-label{
  margin-top:6px;
  font-size:13px;
  color:var(--text-2);
  line-height:1.7;
}

/* ============ 锚点胶囊导航 ============ */
.anchor-bar{
  position:sticky;
  top:var(--header-h);
  z-index:70;
  background:rgba(245,241,232,.94);
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.anchor-inner{
  display:flex;
  gap:10px;
  padding-top:14px;
  padding-bottom:14px;
  overflow-x:auto;
  scrollbar-width:none;
}
.anchor-inner::-webkit-scrollbar{display:none;}
.pill{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  height:40px;
  padding:0 18px;
  border-radius:var(--r-btn);
  border:1px solid var(--line);
  background:var(--card);
  font-size:14px;
  font-weight:500;
  color:var(--text-2);
  transition:color .18s ease,border-color .18s ease,background-color .18s ease;
}
.pill:hover{color:var(--ink);border-color:var(--ink);background:#fff;}
.pill:active{background:var(--layer);}
.pill.is-current{
  color:#F5F1E8;
  background:var(--ink);
  border-color:var(--ink);
}

/* ============ 通用板块 ============ */
.section{
  padding:88px 0;
  border-bottom:1px solid var(--line);
}
.section:last-of-type{border-bottom:0;}
.section-head{
  max-width:760px;
  margin-bottom:40px;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-size:13px;
  font-weight:600;
  letter-spacing:.06em;
  color:var(--accent);
}
.eyebrow::before{
  content:"";
  width:16px;height:1.5px;
  background:var(--accent);
  display:block;
}
.section h2{
  margin-top:12px;
  font-size:clamp(24px,3vw,32px);
  line-height:1.3;
  font-weight:600;
  letter-spacing:.01em;
  color:var(--ink);
}
.section-sub{
  margin-top:12px;
  font-size:16px;
  line-height:1.8;
  color:var(--text-2);
  max-width:720px;
}

/* ============ 交替图文 ============ */
.split{
  display:grid;
  grid-template-columns:7fr 5fr;
  gap:56px;
  align-items:center;
  padding:48px 0;
  border-top:1px solid var(--line);
}
.split:first-of-type{border-top:0;padding-top:0;}
.split.is-reverse{grid-template-columns:5fr 7fr;}
.split.is-reverse .split-media{order:-1;}
.split-body h3{
  font-size:24px;
  line-height:1.35;
  font-weight:600;
  color:var(--ink);
  letter-spacing:.01em;
}
.split-body p{
  margin-top:14px;
  font-size:16px;
  line-height:1.85;
  color:var(--text-2);
}
.point-list{
  margin-top:22px;
  display:flex;
  flex-direction:column;
  gap:12px;
}
.point-list li{
  position:relative;
  padding-left:22px;
  font-size:15px;
  line-height:1.75;
  color:var(--text);
}
.point-list li::before{
  content:"";
  position:absolute;
  left:2px;
  top:11px;
  width:10px;height:6px;
  border-left:1.5px solid var(--accent);
  border-bottom:1.5px solid var(--accent);
  transform:rotate(-45deg);
}
.split-media{
  position:relative;
  border-radius:var(--r-img);
  overflow:hidden;
  border:1px solid var(--line);
  background:var(--layer);
}
.split-media img{
  width:100%;
  aspect-ratio:16/10;
  object-fit:cover;
  border-radius:var(--r-img);
  transition:transform .4s ease;
}
.split-media:hover img{transform:scale(1.02);}
.media-tag{
  position:absolute;
  top:0;left:0;
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:6px 12px;
  font-size:12px;
  line-height:1.5;
  letter-spacing:.02em;
  color:var(--ink);
  background:rgba(245,241,232,.94);
  border-right:1px solid var(--line);
  border-bottom:1px solid var(--line);
  border-bottom-right-radius:8px;
  border-top-left-radius:11px;
}

/* ============ 功能核对清单 ============ */
.checklist-wrap{
  background:var(--layer);
  border-radius:var(--r-card);
  border:1px solid var(--line);
  padding:40px;
}
.check-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:0 56px;
}
.check-list li{
  position:relative;
  padding:16px 0 16px 30px;
  font-size:15px;
  line-height:1.7;
  color:var(--text);
  border-bottom:1px solid var(--line);
}
.check-list li::before{
  content:"";
  position:absolute;
  left:2px;
  top:22px;
  width:11px;height:6px;
  border-left:1.5px solid var(--ink-2);
  border-bottom:1.5px solid var(--ink-2);
  transform:rotate(-45deg);
}
.check-list li strong{
  font-weight:600;
  color:var(--ink);
  margin-right:6px;
}
.check-note{
  margin-top:26px;
  font-size:13px;
  line-height:1.8;
  color:var(--text-3);
  font-variant-numeric:tabular-nums;
}

/* ============ 下载窄条 ============ */
.download-band{
  padding:72px 0;
  background:var(--cx-layer,var(--layer));
  border-top:1px solid var(--line);
}
.download-inner{
  display:grid;
  grid-template-columns:5fr 7fr;
  gap:48px;
  align-items:center;
}
.download-copy h2{
  font-size:clamp(22px,2.6vw,28px);
  line-height:1.35;
  font-weight:600;
  color:var(--ink);
  letter-spacing:.01em;
}
.download-copy p{
  margin-top:12px;
  font-size:15px;
  line-height:1.8;
  color:var(--text-2);
}
.platform-buttons{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
}
.platform-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:48px;
  padding:0 24px;
  border-radius:var(--r-btn);
  border:1px solid var(--ink);
  background:transparent;
  color:var(--ink);
  font-size:15px;
  font-weight:600;
  cursor:pointer;
  transition:background-color .18s ease,color .18s ease,transform .18s ease,box-shadow .18s ease,border-color .18s ease;
}
.platform-btn svg{width:18px;height:18px;}
.platform-btn:hover{background:var(--ink);color:#F5F1E8;transform:translateY(-1px);}
.platform-btn:active{transform:translateY(0);}
.platform-btn.is-primary{
  background:var(--accent);
  border-color:var(--accent);
  color:#F5F1E8;
}
.platform-btn.is-primary:hover{background:var(--accent-hover);border-color:var(--accent-hover);box-shadow:var(--shadow-hover);}
.platform-btn.is-primary:active{background:var(--accent-hover);transform:translateY(0);box-shadow:none;}
.platform-meta{
  margin-top:16px;
  font-size:12px;
  line-height:1.7;
  color:var(--text-3);
  font-variant-numeric:tabular-nums;
}

/* ============ 页脚 ============ */
.site-footer{
  background:var(--ink);
  color:#F5F1E8;
  padding:64px 0 0;
}
.site-footer .brand-text{color:#F5F1E8;}
.site-footer .brand-mark{color:#F5F1E8;}
.footer-grid{
  display:grid;
  grid-template-columns:4fr 2fr 3fr 3fr;
  gap:40px;
  padding-bottom:48px;
}
.footer-brand p{
  margin-top:18px;
  font-size:14px;
  line-height:1.85;
  color:rgba(245,241,232,.72);
  max-width:340px;
}
.footer-title{
  font-size:14px;
  font-weight:600;
  letter-spacing:.04em;
  color:#F5F1E8;
  margin-bottom:16px;
}
.footer-list li{
  font-size:14px;
  line-height:1.8;
  color:rgba(245,241,232,.72);
  margin-bottom:10px;
}
.footer-list a{
  color:rgba(245,241,232,.72);
  transition:color .18s ease;
}
.footer-list a:hover{color:#F5F1E8;text-decoration:underline;text-underline-offset:4px;}
.footer-band{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  flex-wrap:wrap;
  padding:24px 0;
  border-top:1px solid rgba(245,241,232,.16);
  border-bottom:1px solid rgba(245,241,232,.16);
}
.footer-band p{
  font-size:14px;
  line-height:1.7;
  color:rgba(245,241,232,.8);
}
.footer-bottom{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  flex-wrap:wrap;
  padding:22px 0 26px;
  font-size:12px;
  line-height:1.7;
  color:rgba(245,241,232,.62);
}
.footer-bottom nav{
  display:flex;
  flex-wrap:wrap;
  gap:16px;
}
.footer-bottom a{
  color:rgba(245,241,232,.62);
  transition:color .18s ease;
}
.footer-bottom a:hover{color:#F5F1E8;}

/* ============ 响应式 ============ */
@media (max-width:1279px){
  .container{max-width:1120px;}
}

@media (max-width:1023px){
  .nav{
    position:fixed;
    top:var(--header-h);
    left:0;right:0;
    bottom:0;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    margin-left:0;
    padding:12px 24px 100px;
    background:var(--canvas);
    overflow-y:auto;
    z-index:85;
  }
  body.nav-open .nav{display:flex;}
  .nav-link{
    font-size:18px;
    line-height:1.4;
    padding:18px 0;
    border-bottom:1px solid var(--line);
  }
  .nav-link::after{display:none;}
  .nav-link.is-active{color:var(--accent);}
  .nav-toggle{display:flex;}
  body.nav-open .nav-toggle span:nth-child(1){transform:translateY(6px) rotate(45deg);}
  body.nav-open .nav-toggle span:nth-child(2){opacity:0;}
  body.nav-open .nav-toggle span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}
  .header-divider{display:none;}
  .header-actions .btn-sm{display:none;}
  body.nav-open .header-actions .btn-sm{
    display:inline-flex;
    position:fixed;
    left:24px;right:24px;
    bottom:24px;
    z-index:86;
    height:52px;
  }
  .header-inner{gap:16px;}
  .split,
  .split.is-reverse{grid-template-columns:1fr;gap:28px;}
  .split.is-reverse .split-media{order:0;}
  .facts-grid{grid-template-columns:repeat(2,1fr);}
  .fact{border-right:0;border-bottom:1px solid var(--line);padding:22px 0;}
  .fact:nth-child(odd){border-right:1px solid var(--line);padding-right:20px;}
  .fact:nth-child(even){padding-left:20px;}
  .fact:nth-last-child(-n+2){border-bottom:0;}
  .fact:first-child,.fact:not(:first-child){padding-left:0;}
  .fact:nth-child(even){padding-left:20px;}
  .download-inner{grid-template-columns:1fr;gap:28px;}
  .section{padding:72px 0;}
  .hero{padding:calc(var(--header-h) + 48px) 0 56px;}
  .checklist-wrap{padding:28px;}
  .check-grid{grid-template-columns:1fr;gap:0;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
}

@media (max-width:767px){
  :root{--header-h:64px;}
  .container{padding:0 20px;}
  .hero h1{font-size:30px;}
  .hero-lead{font-size:16px;}
  .hero-actions .btn{width:100%;}
  .section{padding:56px 0;}
  .split{padding:36px 0;}
  .anchor-bar{top:var(--header-h);}
  .pill{height:38px;padding:0 16px;font-size:13px;}
  .facts-grid{grid-template-columns:1fr;}
  .fact,
  .fact:nth-child(odd),
  .fact:nth-child(even){
    border-right:0;
    border-bottom:1px solid var(--line);
    padding:18px 0;
  }
  .fact:last-child{border-bottom:0;}
  .fact-num{font-size:26px;}
  .checklist-wrap{padding:22px;}
  .platform-buttons{flex-direction:column;}
  .platform-btn{width:100%;}
  .download-band{padding:56px 0;}
  .footer-grid{grid-template-columns:1fr;gap:28px;padding-bottom:36px;}
  .footer-band{padding:20px 0;}
  .footer-band .btn{width:100%;}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:12px;}
  .nav-link{font-size:17px;}
}

@media (max-width:400px){
  .btn{padding:0 22px;font-size:15px;}
  .hero-meta span{display:block;}
  .hero-meta span + span::before{content:none;}
  .hero-meta span + span{margin-top:4px;}
}

@media (prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important;scroll-behavior:auto !important;}
}

/* roulang page: article */
:root{
  --ink:#0F2B26;
  --ink-2:#16453C;
  --accent:#A9491F;
  --accent-dark:#8C3A16;
  --accent-soft:#EBD9C4;
  --canvas:#F5F1E8;
  --canvas-2:#F0EBDF;
  --card:#FFFCF6;
  --text:#1C2420;
  --text-2:#5A615C;
  --text-3:#8A908B;
  --line:rgba(15,43,38,0.12);
  --line-strong:rgba(15,43,38,0.22);
  --line-accent:rgba(169,73,31,0.28);
  --radius-card:16px;
  --radius-img:12px;
  --radius-btn:999px;
  --shadow-hover:0 18px 40px -28px rgba(15,43,38,0.45);
  --container:1200px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  font-size:16px;
  line-height:1.8;
  color:var(--text);
  background:var(--canvas);
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0}
ul,ol{padding:0}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
input,textarea,select{font:inherit}
::selection{background:rgba(169,73,31,0.18)}
:focus-visible{outline:2px solid var(--ink);outline-offset:2px}
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px}

/* ---------- header ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(245,241,232,0.94);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
  transition:box-shadow .18s ease;
}
.site-header.is-scrolled{box-shadow:0 12px 30px -26px rgba(15,43,38,0.6)}
.header-inner{display:flex;align-items:center;height:76px;gap:24px}
.brand{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto}
.brand-mark{width:30px;height:30px;color:var(--ink);display:inline-flex}
.brand-mark svg{width:100%;height:100%}
.brand-text{font-size:17px;font-weight:600;letter-spacing:.04em;color:var(--ink);white-space:nowrap}
.nav{flex:1 1 auto;display:flex;align-items:center;justify-content:center;gap:28px}
.nav-link{
  position:relative;
  display:inline-block;
  padding:6px 0;
  font-size:15px;
  font-weight:500;
  letter-spacing:.02em;
  color:var(--text-2);
  transition:color .18s ease;
  white-space:nowrap;
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;bottom:-1px;
  width:100%;height:2px;
  background:var(--ink);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .2s ease;
}
.nav-link:hover{color:var(--ink)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link.is-active{color:var(--ink);font-weight:600}
.nav-link.is-active::after{transform:scaleX(1)}
.header-actions{flex:0 0 auto;display:flex;align-items:center;gap:16px}
.header-divider{width:1px;height:20px;background:var(--line-strong)}
.nav-toggle{
  display:none;
  width:44px;height:44px;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:5px;
  border:1px solid var(--line-strong);
  border-radius:10px;
  transition:background .18s ease,border-color .18s ease;
}
.nav-toggle:hover{background:var(--canvas-2);border-color:var(--line-strong)}
.nav-toggle span{display:block;width:18px;height:1px;background:var(--ink);transition:transform .2s ease,opacity .2s ease}
.nav-toggle.is-active span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle.is-active span:nth-child(2){opacity:0}
.nav-toggle.is-active span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:52px;
  padding:0 32px;
  border:1px solid transparent;
  border-radius:var(--radius-btn);
  font-size:15px;
  font-weight:600;
  letter-spacing:.02em;
  white-space:nowrap;
  cursor:pointer;
  transition:background .18s ease,color .18s ease,border-color .18s ease,transform .18s ease,box-shadow .18s ease;
}
.btn-primary{background:var(--accent);color:#FFF8F0}
.btn-primary:hover{background:var(--accent-dark);transform:translateY(-1px);box-shadow:var(--shadow-hover)}
.btn-primary:active{transform:translateY(0);box-shadow:none}
.btn-outline{background:transparent;border-color:var(--ink);color:var(--ink)}
.btn-outline:hover{background:var(--ink);color:var(--canvas)}
.btn-outline:active{transform:translateY(1px)}
.btn-sm{height:42px;padding:0 22px;font-size:14px}
.btn[disabled],.btn.is-disabled{background:#C9C4B8;border-color:#C9C4B8;color:#4B4E4A;cursor:not-allowed;transform:none;box-shadow:none}
.link-arrow{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-size:15px;
  font-weight:600;
  color:var(--ink);
  transition:color .18s ease;
}
.link-arrow svg{width:16px;height:16px;transition:transform .18s ease}
.link-arrow:hover{color:var(--accent);text-decoration:underline;text-underline-offset:5px}
.link-arrow:hover svg{transform:translateX(3px)}

/* ---------- breadcrumb ---------- */
.breadcrumb{padding:26px 0 0;font-size:12px;color:var(--text-3)}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb li{display:inline-flex;align-items:center;gap:8px;max-width:100%}
.breadcrumb li + li::before{content:"/";color:var(--line-strong);font-size:12px}
.breadcrumb a{color:var(--text-2);transition:color .18s ease}
.breadcrumb a:hover{color:var(--accent)}
.breadcrumb .current{color:var(--ink);font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:52vw}

/* ---------- article layout ---------- */
.article-layout{
  display:grid;
  grid-template-columns:minmax(0,1fr) 300px;
  gap:56px;
  align-items:start;
  padding:26px 0 72px;
}
.article-main{min-width:0;max-width:840px}
.badge{
  display:inline-block;
  padding:5px 10px;
  border-radius:6px;
  background:var(--accent-soft);
  color:#7A3413;
  font-size:11px;
  font-weight:600;
  letter-spacing:.08em;
}
.article-head{padding:22px 0 26px;border-bottom:1px solid var(--line)}
.article-head h1{
  margin:18px 0 20px;
  font-size:clamp(28px,3.6vw,40px);
  line-height:1.26;
  font-weight:600;
  letter-spacing:.01em;
  color:var(--ink);
  overflow-wrap:break-word;
}
.article-meta{display:flex;flex-wrap:wrap;align-items:center;font-size:13px;color:var(--text-2)}
.article-meta span{display:inline-flex;align-items:center}
.article-meta span + span::before{
  content:"";
  display:inline-block;
  width:1px;height:12px;
  margin:0 14px;
  background:var(--line-strong);
}

/* ---------- article body ---------- */
.article-body{
  padding:36px 0 8px;
  font-size:16px;
  line-height:1.9;
  color:var(--text);
  overflow-wrap:break-word;
  word-break:break-word;
}
.article-body > * + *{margin-top:1.1em}
.article-body p{margin:0}
.article-body h2{
  position:relative;
  margin:40px 0 16px;
  padding-left:14px;
  font-size:clamp(22px,2.6vw,28px);
  line-height:1.35;
  font-weight:600;
  letter-spacing:.01em;
  color:var(--ink);
}
.article-body h2::before{
  content:"";
  position:absolute;
  left:0;top:.3em;
  width:3px;height:18px;
  border-radius:2px;
  background:var(--accent);
}
.article-body h3{
  margin:28px 0 12px;
  font-size:19px;
  line-height:1.4;
  font-weight:600;
  color:var(--ink-2);
}
.article-body h4{
  margin:22px 0 10px;
  font-size:17px;
  line-height:1.45;
  font-weight:600;
  color:var(--ink-2);
}
.article-body ul,.article-body ol{margin:1.1em 0;padding-left:1.4em}
.article-body li + li{margin-top:.6em}
.article-body ul li::marker{color:var(--accent)}
.article-body ol li::marker{color:var(--accent);font-weight:600}
.article-body blockquote{
  margin:28px 0;
  padding:18px 20px;
  background:var(--canvas-2);
  border-left:3px solid var(--accent);
  border-radius:0 10px 10px 0;
  color:var(--text-2);
}
.article-body blockquote p{margin:0}
.article-body strong{color:var(--ink);font-weight:600}
.article-body a{color:var(--accent);text-decoration:underline;text-underline-offset:4px}
.article-body a:hover{color:var(--accent-dark)}
.article-body img{border-radius:var(--radius-img);margin:24px 0}
.article-body figure{margin:24px 0}
.article-body figcaption{
  margin-top:10px;
  text-align:center;
  font-size:13px;
  line-height:1.7;
  color:var(--text-3);
}
.article-body code{
  padding:2px 6px;
  border-radius:6px;
  background:var(--canvas-2);
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  font-size:13px;
}
.article-body pre{
  margin:24px 0;
  padding:18px;
  border-radius:10px;
  background:var(--canvas-2);
  overflow-x:auto;
  font-size:13px;
  line-height:1.7;
}
.article-body pre code{padding:0;background:none;font-size:13px}
.article-body table{
  width:100%;
  border-collapse:collapse;
  margin:24px 0;
  font-size:14px;
  line-height:1.6;
}
.article-body th,.article-body td{
  padding:12px 16px;
  border:1px solid var(--line);
  text-align:left;
  vertical-align:top;
}
.article-body th{background:var(--canvas-2);font-weight:600;color:var(--ink)}
.article-body hr{border:0;border-top:1px solid var(--line);margin:36px 0}
.article-body iframe{max-width:100%;border-radius:var(--radius-img)}

/* ---------- article footer / empty ---------- */
.article-foot{
  margin-top:36px;
  padding-top:24px;
  border-top:1px solid var(--line);
  display:flex;
  flex-wrap:wrap;
  gap:16px;
  align-items:center;
  justify-content:space-between;
}
.article-foot p{font-size:13px;color:var(--text-3);line-height:1.7}
.empty-state{
  margin:36px 0 8px;
  padding:56px 24px;
  border:1px dashed var(--line-strong);
  border-radius:var(--radius-card);
  text-align:center;
  color:var(--text-2);
  background:var(--card);
}
.empty-state p{font-size:15px;margin-bottom:18px}

/* ---------- sidebar ---------- */
.article-side{
  position:sticky;
  top:100px;
  display:grid;
  gap:20px;
}
.side-card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  padding:24px 22px;
}
.side-title{
  font-size:14px;
  font-weight:600;
  letter-spacing:.06em;
  color:var(--ink);
  margin-bottom:12px;
}
.side-text{font-size:13px;line-height:1.8;color:var(--text-2);margin-bottom:16px}
.side-card .btn{width:100%}
.side-list{list-style:none}
.side-list li + li{margin-top:2px}
.side-list a{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  padding:10px 0;
  font-size:14px;
  color:var(--text-2);
  border-bottom:1px solid var(--line);
  transition:color .18s ease,padding-left .18s ease;
}
.side-list li:last-child a{border-bottom:0}
.side-list a:hover{color:var(--accent);padding-left:4px}
.side-list a svg{width:14px;height:14px;flex:0 0 auto;opacity:.6}

/* ---------- related ---------- */
.related{padding:0 0 72px}
.section-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:24px;
  flex-wrap:wrap;
  padding-bottom:18px;
  margin-bottom:28px;
  border-bottom:1px solid var(--line);
}
.section-head h2{
  font-size:clamp(22px,2.6vw,28px);
  line-height:1.3;
  font-weight:600;
  letter-spacing:.01em;
  color:var(--ink);
}
.section-head p{font-size:14px;color:var(--text-2);line-height:1.7;margin-top:6px}
.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.related-card{
  display:flex;
  gap:16px;
  padding:16px;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  transition:border-color .18s ease,transform .18s ease,box-shadow .18s ease;
}
.related-card:hover{border-color:var(--line-accent);transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.related-card img{
  width:76px;height:76px;flex:0 0 auto;
  object-fit:cover;
  border-radius:var(--radius-img);
  background:var(--canvas-2);
}
.related-card h3{
  font-size:15px;
  line-height:1.45;
  font-weight:600;
  color:var(--ink);
  margin-bottom:6px;
}
.related-card p{font-size:13px;line-height:1.65;color:var(--text-2)}

/* ---------- download strip ---------- */
.download-strip{
  background:var(--ink);
  color:var(--canvas);
  border-radius:20px;
  padding:44px 40px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:36px;
  flex-wrap:wrap;
  margin-bottom:80px;
}
.download-strip h2{
  font-size:clamp(22px,2.6vw,28px);
  line-height:1.35;
  font-weight:600;
  letter-spacing:.01em;
  color:#F8F4EA;
  margin-bottom:10px;
}
.download-strip p{font-size:14px;line-height:1.8;color:rgba(245,241,232,0.72);max-width:520px}
.dl-wrap{display:grid;gap:12px;justify-items:start}
.dl-group{display:flex;flex-wrap:wrap;gap:12px}
.dl-btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  height:48px;
  padding:0 22px;
  border-radius:var(--radius-btn);
  border:1px solid rgba(245,241,232,0.32);
  color:#F5F1E8;
  font-size:14px;
  font-weight:600;
  transition:background .18s ease,border-color .18s ease,color .18s ease,transform .18s ease;
}
.dl-btn svg{width:16px;height:16px;flex:0 0 auto}
.dl-btn:hover{background:rgba(245,241,232,0.1);border-color:rgba(245,241,232,0.55);transform:translateY(-1px)}
.dl-btn.is-primary{background:var(--accent);border-color:var(--accent);color:#FFF8F0}
.dl-btn.is-primary:hover{background:var(--accent-dark);border-color:var(--accent-dark)}
.dl-note{font-size:12px;line-height:1.6;color:rgba(245,241,232,0.6)}

/* ---------- footer ---------- */
.site-footer{background:var(--ink);color:var(--canvas);padding:72px 0 0;border-top:1px solid rgba(245,241,232,0.12)}
.footer-grid{
  display:grid;
  grid-template-columns:1.7fr 1fr 1fr 1.2fr;
  gap:40px;
  padding-bottom:48px;
}
.footer-brand .brand{margin-bottom:16px}
.footer-brand .brand-mark{color:var(--canvas)}
.footer-brand .brand-text{color:var(--canvas)}
.footer-brand p{font-size:13px;line-height:1.9;color:rgba(245,241,232,0.66);max-width:360px}
.footer-title{font-size:12px;font-weight:600;letter-spacing:.14em;color:rgba(245,241,232,0.55);margin-bottom:16px}
.footer-list{list-style:none}
.footer-list li + li{margin-top:10px}
.footer-list a,.footer-list span{font-size:14px;line-height:1.7;color:rgba(245,241,232,0.78);transition:color .18s ease}
.footer-list a:hover{color:#F5F1E8;text-decoration:underline;text-underline-offset:4px}
.footer-band{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  flex-wrap:wrap;
  padding:22px 26px;
  border:1px solid rgba(245,241,232,0.18);
  border-radius:16px;
  margin-bottom:32px;
}
.footer-band p{font-size:14px;line-height:1.7;color:rgba(245,241,232,0.8)}
.footer-bottom{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  flex-wrap:wrap;
  padding:20px 0 28px;
  border-top:1px solid rgba(245,241,232,0.14);
  font-size:12px;
  color:rgba(245,241,232,0.6);
}
.footer-bottom nav{display:flex;flex-wrap:wrap;gap:18px}
.footer-bottom a{color:rgba(245,241,232,0.72);transition:color .18s ease}
.footer-bottom a:hover{color:#F5F1E8}

/* ---------- responsive ---------- */
@media (max-width:1279px){
  .nav{gap:20px}
  .article-layout{gap:40px;grid-template-columns:minmax(0,1fr) 280px}
}
@media (max-width:1023px){
  .nav{
    position:fixed;
    top:76px;left:0;right:0;
    height:calc(100vh - 76px);
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    gap:0;
    padding:8px 24px 120px;
    background:var(--canvas);
    border-top:1px solid var(--line);
    overflow-y:auto;
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .22s ease,transform .22s ease,visibility .22s ease;
  }
  .nav.is-open{opacity:1;visibility:visible;transform:translateY(0)}
  .nav-link{
    width:100%;
    padding:18px 0;
    font-size:18px;
    border-bottom:1px solid var(--line);
  }
  .nav-link::after{display:none}
  .nav-link.is-active{color:var(--accent)}
  .nav-toggle{display:inline-flex}
  .header-divider{display:none}
  .article-layout{grid-template-columns:minmax(0,1fr);gap:40px;padding-bottom:56px}
  .article-side{display:none}
  .related-grid{grid-template-columns:1fr}
  .related-card img{width:68px;height:68px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .footer-brand{grid-column:1 / -1}
  .related{padding-bottom:56px}
}
@media (max-width:767px){
  .container{padding:0 20px}
  .header-inner{height:68px;gap:16px}
  .nav{top:68px;height:calc(100vh - 68px);padding:8px 20px 120px}
  .brand-text{font-size:16px}
  .brand-mark{width:26px;height:26px}
  .breadcrumb{padding-top:20px}
  .article-head h1{font-size:26px;margin:14px 0 16px}
  .article-body{padding-top:28px;font-size:16px;line-height:1.9}
  .article-body h2{margin-top:32px}
  .article-body th,.article-body td{padding:10px 12px;font-size:13px}
  .download-strip{padding:32px 24px;border-radius:16px;margin-bottom:56px}
  .download-strip p{font-size:13px}
  .dl-wrap{width:100%}
  .dl-group{width:100%}
  .dl-btn{flex:1 1 100%;justify-content:center}
  .footer-grid{grid-template-columns:1fr;gap:28px;padding-bottom:36px}
  .footer-band{padding:20px;flex-direction:column;align-items:flex-start}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:14px}
  .site-footer{padding-top:56px}
}
@media (max-width:520px){
  .btn{width:100%;padding:0 22px}
  .btn-sm{width:auto}
  .section-head{flex-direction:column;align-items:flex-start;gap:10px}
  .article-meta{font-size:12px}
  .article-meta span + span::before{margin:0 10px}
  .related-card{padding:14px}
  .related-card img{width:60px;height:60px}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important;scroll-behavior:auto !important}
}

/* roulang page: category2 */
:root{
  --ink:#0F2B26;
  --ink-soft:#16453C;
  --ink-hover:#0A1F1B;
  --accent:#A9491F;
  --accent-hover:#8C3A16;
  --accent-tint:#EBD9C4;
  --canvas:#F5F1E8;
  --layer:#F0EBDF;
  --card:#FFFCF6;
  --text:#1C2420;
  --text-2:#5A615C;
  --text-3:#8A908B;
  --line:rgba(15,43,38,.12);
  --line-strong:rgba(15,43,38,.24);
  --line-accent:rgba(169,73,31,.28);
  --ok:#2F6B4F;
  --muted:#C9C4B8;
  --r-btn:999px;
  --r-card:16px;
  --r-img:12px;
  --r-input:10px;
  --r-badge:6px;
  --shadow-hover:0 18px 40px -28px rgba(15,43,38,.45);
  --container:1200px;
  --ease:180ms ease;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  font-size:16px;
  line-height:1.8;
  color:var(--text);
  background:var(--canvas);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto}
a{color:var(--ink);text-decoration:none;transition:color var(--ease),border-color var(--ease),background var(--ease),transform var(--ease)}
a:hover{color:var(--accent)}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
:focus-visible{outline:2px solid var(--ink);outline-offset:2px;border-radius:4px}
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px}
@media (min-width:1400px){.container{max-width:1320px}}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:52px;padding:0 32px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;letter-spacing:.02em;
  border:1px solid transparent;cursor:pointer;
  transition:background var(--ease),color var(--ease),border-color var(--ease),transform var(--ease),box-shadow var(--ease);
}
.btn-primary{background:var(--accent);color:var(--canvas);border-color:var(--accent)}
.btn-primary:hover{background:var(--accent-hover);color:var(--canvas);transform:translateY(-1px);box-shadow:var(--shadow-hover)}
.btn-primary:active{transform:translateY(0);box-shadow:none}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line-strong)}
.btn-ghost:hover{background:var(--ink);color:var(--canvas);border-color:var(--ink)}
.btn-sm{height:40px;padding:0 20px;font-size:14px}
.btn-block{width:100%}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--muted);border-color:var(--muted);color:#5A615C;cursor:not-allowed;transform:none;box-shadow:none}
.link-arrow{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--ink);border-bottom:1px solid transparent;padding-bottom:2px}
.link-arrow svg{transition:transform var(--ease)}
.link-arrow:hover{color:var(--accent);border-bottom-color:var(--accent)}
.link-arrow:hover svg{transform:translateX(3px)}

/* ---------- header ---------- */
.site-header{
  position:fixed;inset:0 0 auto 0;z-index:100;
  background:transparent;border-bottom:1px solid transparent;
  transition:background var(--ease),border-color var(--ease),box-shadow var(--ease),backdrop-filter var(--ease);
}
.site-header.is-scrolled{
  background:rgba(245,241,232,.94);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(8px);
  box-shadow:0 10px 30px -30px rgba(15,43,38,.6);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;height:76px}
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--ink)}
.brand:hover{color:var(--ink)}
.brand-mark{display:inline-flex;width:32px;height:32px;color:var(--ink-soft)}
.brand-mark svg{width:100%;height:100%}
.brand-text{font-size:18px;font-weight:600;letter-spacing:.04em}
.nav{display:flex;align-items:center;gap:28px}
.nav-link{
  position:relative;font-size:15px;font-weight:500;letter-spacing:.02em;color:var(--text-2);
  padding:6px 0;
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--ink);
  transform:scaleX(0);transform-origin:left;transition:transform 200ms ease;
}
.nav-link:hover{color:var(--ink)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link.is-active{color:var(--ink)}
.nav-link.is-active::after{transform:scaleX(1)}
.header-actions{display:flex;align-items:center;gap:16px}
.header-divider{width:1px;height:22px;background:var(--line-strong)}
.nav-toggle{display:none;width:44px;height:44px;flex-direction:column;justify-content:center;align-items:center;gap:5px}
.nav-toggle span{display:block;width:20px;height:1px;background:var(--ink);transition:transform var(--ease),opacity var(--ease)}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* ---------- hero ---------- */
.page-hero{padding:132px 0 64px;border-bottom:1px solid var(--line)}
.hero-grid{display:grid;grid-template-columns:1.35fr .85fr;gap:56px;align-items:center;margin-top:28px}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12px;font-weight:500;letter-spacing:.06em;color:var(--ink-soft);
  border:1px solid var(--line-strong);border-radius:var(--r-btn);
  padding:5px 14px;background:rgba(255,252,246,.7);
}
.eyebrow::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--accent)}
.page-hero h1{
  margin-top:20px;
  font-size:clamp(30px,4.2vw,46px);
  line-height:1.22;font-weight:600;letter-spacing:.01em;color:var(--ink);
}
.lead{margin-top:18px;font-size:17px;line-height:1.85;color:var(--text-2);max-width:640px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px}
.micro{margin-top:16px;font-size:12px;line-height:1.6;color:var(--text-3);font-variant-numeric:tabular-nums}
.hero-figure{position:relative;border-radius:var(--r-img);overflow:hidden;border:1px solid var(--line);background:var(--layer)}
.hero-figure img{width:100%;aspect-ratio:4/3;object-fit:cover}
.hero-tag{
  position:absolute;left:14px;top:14px;
  background:rgba(245,241,232,.94);border:1px solid var(--line);
  border-radius:var(--r-badge);padding:5px 10px;
  font-size:11px;font-weight:600;letter-spacing:.04em;color:var(--ink);
  font-variant-numeric:tabular-nums;
}

/* ---------- breadcrumb ---------- */
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:12px;color:var(--text-3)}
.breadcrumb a{color:var(--text-3)}
.breadcrumb a:hover{color:var(--accent)}
.breadcrumb .sep{color:var(--muted)}
.breadcrumb .current{color:var(--ink);font-weight:500}

/* ---------- anchor chips ---------- */
.chip-bar{position:sticky;top:76px;z-index:60;background:rgba(245,241,232,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(8px)}
.chip-track{display:flex;gap:10px;padding:14px 0;overflow-x:auto;scrollbar-width:none}
.chip-track::-webkit-scrollbar{display:none}
.chip{
  flex:0 0 auto;display:inline-flex;align-items:center;
  height:38px;padding:0 18px;border-radius:var(--r-btn);
  border:1px solid var(--line-strong);background:var(--card);
  font-size:14px;font-weight:500;color:var(--text-2);white-space:nowrap;
  transition:all var(--ease);
}
.chip:hover{border-color:var(--ink);color:var(--ink)}
.chip.is-active{background:var(--ink);border-color:var(--ink);color:var(--canvas)}

/* ---------- guide layout ---------- */
.section{padding:80px 0}
.section-head{max-width:720px;margin-bottom:36px}
.section-head h2{font-size:clamp(24px,3vw,32px);line-height:1.3;font-weight:600;letter-spacing:.01em;color:var(--ink)}
.section-head p{margin-top:12px;font-size:15px;line-height:1.8;color:var(--text-2)}
.guide-layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:56px;align-items:start}
.toc{position:sticky;top:150px;border-left:1px solid var(--line);padding-left:20px}
.toc-title{font-size:12px;font-weight:600;letter-spacing:.1em;color:var(--text-3);margin-bottom:14px}
.toc-list{display:flex;flex-direction:column;gap:4px}
.toc-list a{
  display:block;position:relative;padding:8px 0 8px 12px;
  font-size:14px;line-height:1.6;color:var(--text-2);
}
.toc-list a::before{
  content:"";position:absolute;left:-21px;top:10px;bottom:10px;width:2px;
  background:var(--accent);transform:scaleY(0);transform-origin:top;transition:transform var(--ease);
}
.toc-list a:hover{color:var(--ink)}
.toc-list a.is-active{color:var(--ink);font-weight:600}
.toc-list a.is-active::before{transform:scaleY(1)}

.steps{display:flex;flex-direction:column}
.step{padding:32px 0;border-top:1px solid var(--line)}
.step:first-child{border-top:0;padding-top:0}
.step-no{
  font-size:40px;line-height:1;font-weight:600;color:var(--accent);
  font-variant-numeric:tabular-nums;letter-spacing:.02em;
}
.step h3{margin-top:12px;font-size:20px;line-height:1.4;font-weight:600;color:var(--ink)}
.step p{margin-top:12px;font-size:16px;line-height:1.9;color:var(--text-2);max-width:760px}
.step-meta{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
.badge{
  display:inline-flex;align-items:center;gap:6px;
  background:var(--accent-tint);color:#6E3413;
  border-radius:var(--r-badge);padding:4px 10px;
  font-size:11px;font-weight:600;letter-spacing:.03em;
  font-variant-numeric:tabular-nums;
}
.badge-plain{background:var(--layer);color:var(--text-2);border:1px solid var(--line)}
.step-figure{margin-top:22px;border-radius:var(--r-img);overflow:hidden;border:1px solid var(--line)}
.step-figure img{width:100%;aspect-ratio:16/10;object-fit:cover}
.step-figure figcaption{margin-top:10px;font-size:13px;color:var(--text-3);text-align:center}

.tip{
  margin-top:22px;background:var(--layer);
  border-left:3px solid var(--accent);border-radius:0 var(--r-badge) var(--r-badge) 0;
  padding:16px 20px;font-size:14px;line-height:1.8;color:var(--text-2);
}
.tip strong{color:var(--ink);font-weight:600}

/* ---------- checklist ---------- */
.checklist{display:grid;grid-template-columns:1fr 1fr;gap:0 40px;margin-top:8px}
.checklist li{
  display:flex;gap:12px;align-items:flex-start;
  padding:14px 0;border-bottom:1px solid var(--line);
  font-size:15px;line-height:1.7;color:var(--text-2);
}
.checklist li svg{flex:0 0 auto;margin-top:3px;color:var(--ok)}

/* ---------- FAQ ---------- */
.faq{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  width:100%;min-height:64px;padding:16px 0;text-align:left;
  font-size:17px;font-weight:600;color:var(--ink);
}
.faq-q .plus{position:relative;flex:0 0 auto;width:20px;height:20px;border:1px solid var(--line-strong);border-radius:50%;transition:transform var(--ease),border-color var(--ease)}
.faq-q .plus::before,.faq-q .plus::after{content:"";position:absolute;background:var(--ink);transition:transform var(--ease)}
.faq-q .plus::before{left:9px;top:5px;width:1px;height:9px}
.faq-q .plus::after{left:5px;top:9px;width:9px;height:1px}
.faq-item.is-open .faq-q .plus{transform:rotate(45deg);border-color:var(--accent)}
.faq-a{display:none;max-width:720px;padding:0 0 20px;font-size:15px;line-height:1.85;color:var(--text-2)}
.faq-item.is-open .faq-a{display:block}

/* ---------- download band ---------- */
.download-band{background:var(--layer);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:56px 0}
.band-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.band-grid h2{font-size:clamp(22px,2.6vw,28px);line-height:1.35;font-weight:600;color:var(--ink)}
.band-grid p{margin-top:12px;font-size:15px;line-height:1.8;color:var(--text-2);max-width:520px}
.platform-buttons{display:flex;flex-wrap:wrap;gap:12px}
.plat{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 22px;border-radius:var(--r-btn);
  border:1px solid var(--line-strong);background:transparent;
  font-size:14px;font-weight:600;color:var(--ink);
  transition:all var(--ease);
}
.plat svg{flex:0 0 auto}
.plat:hover{border-color:var(--ink);background:var(--ink);color:var(--canvas);transform:translateY(-1px)}
.plat.is-primary{background:var(--accent);border-color:var(--accent);color:var(--canvas)}
.plat.is-primary:hover{background:var(--accent-hover);border-color:var(--accent-hover)}

/* ---------- next step cta ---------- */
.next-card{
  display:grid;grid-template-columns:1fr auto;gap:32px;align-items:center;
  background:var(--card);border:1px solid var(--line);border-radius:var(--r-card);
  padding:32px;margin-top:8px;
  transition:border-color var(--ease),box-shadow var(--ease);
}
.next-card:hover{border-color:var(--line-strong);box-shadow:var(--shadow-hover)}
.next-card h3{font-size:20px;font-weight:600;color:var(--ink)}
.next-card p{margin-top:8px;font-size:14px;line-height:1.8;color:var(--text-2);max-width:560px}

/* ---------- footer ---------- */
.site-footer{background:var(--ink);color:var(--canvas);padding:72px 0 28px;margin-top:0}
.site-footer a{color:var(--canvas)}
.site-footer a:hover{color:var(--accent-tint)}
.footer-grid{display:grid;grid-template-columns:4fr 2fr 3fr 3fr;gap:40px}
.footer-brand .brand{color:var(--canvas)}
.footer-brand .brand-mark{color:var(--accent-tint)}
.footer-brand p{margin-top:16px;font-size:14px;line-height:1.85;color:rgba(245,241,232,.72);max-width:340px}
.footer-title{font-size:13px;font-weight:600;letter-spacing:.08em;color:rgba(245,241,232,.55);margin-bottom:16px}
.footer-list{display:flex;flex-direction:column;gap:10px;font-size:14px}
.footer-list span{color:rgba(245,241,232,.72)}
.footer-band{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:20px;
  margin-top:56px;padding:20px 24px;
  border:1px solid rgba(245,241,232,.22);border-radius:var(--r-card);
}
.footer-band p{font-size:14px;color:rgba(245,241,232,.82)}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:16px;align-items:center;justify-content:space-between;
  margin-top:28px;padding-top:20px;border-top:1px solid rgba(245,241,232,.18);
  font-size:12px;color:rgba(245,241,232,.68);
}
.footer-bottom nav{display:flex;flex-wrap:wrap;gap:16px}
.footer-bottom a{color:rgba(245,241,232,.68)}
.footer-bottom a:hover{color:var(--canvas)}

/* ---------- responsive ---------- */
@media (max-width:1023px){
  .nav{
    position:fixed;inset:76px 0 auto 0;flex-direction:column;align-items:stretch;gap:0;
    background:var(--canvas);border-bottom:1px solid var(--line);
    padding:8px 24px 24px;display:none;
  }
  .nav.is-open{display:flex}
  .nav-link{font-size:18px;padding:16px 0;border-bottom:1px solid var(--line)}
  .nav-link::after{display:none}
  .nav-link.is-active{color:var(--accent)}
  .nav-toggle{display:flex}
  .header-divider{display:none}
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .hero-figure img{aspect-ratio:16/9}
  .guide-layout{grid-template-columns:1fr;gap:32px}
  .toc{position:static;border-left:0;border-top:1px solid var(--line);padding:20px 0 0}
  .toc-list{flex-direction:row;flex-wrap:wrap;gap:8px}
  .toc-list a{padding:8px 14px;border:1px solid var(--line);border-radius:var(--r-btn);font-size:13px}
  .toc-list a::before{display:none}
  .toc-list a.is-active{border-color:var(--accent);color:var(--accent)}
  .band-grid{grid-template-columns:1fr;gap:28px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .footer-brand{grid-column:1/-1}
  .checklist{grid-template-columns:1fr}
}
@media (max-width:767px){
  .container{padding:0 20px}
  .page-hero{padding:112px 0 44px}
  .section{padding:56px 0}
  .chip-bar{top:68px}
  .header-inner{height:68px}
  .nav{inset:68px 0 auto 0}
  .lead{font-size:16px}
  .step-no{font-size:32px}
  .next-card{grid-template-columns:1fr;gap:18px}
  .download-band{padding:44px 0}
  .platform-buttons{flex-direction:column;align-items:stretch}
  .plat{width:100%}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}
@media (max-width:400px){
  .btn{width:100%;padding:0 20px}
  .hero-actions{flex-direction:column;align-items:stretch}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms !important;transition-duration:.01ms !important}
}

/* roulang page: category3 */
:root{
  --ink:#0F2B26;
  --ink-soft:#16453C;
  --ink-hover:#0A1F1B;
  --accent:#A9491F;
  --accent-hover:#8C3A16;
  --sand:#EBD9C4;
  --canvas:#F5F1E8;
  --layer:#F0EBDF;
  --card:#FFFCF6;
  --text:#1C2420;
  --text-2:#5A615C;
  --text-3:#8A908B;
  --line:rgba(15,43,38,.12);
  --line-strong:rgba(15,43,38,.22);
  --line-accent:rgba(169,73,31,.28);
  --radius-btn:999px;
  --radius-card:16px;
  --radius-img:12px;
  --radius-field:10px;
  --radius-badge:6px;
  --shadow-hover:0 18px 40px -28px rgba(15,43,38,.45);
  --space-section:96px;
  --ease:180ms ease;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  background:var(--canvas);
  color:var(--text);
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}
ul,ol{margin:0;padding:0;list-style:none}
dl,dd,dt,p,h1,h2,h3,h4{margin:0}
h1,h2,h3,h4{font-weight:600;letter-spacing:.01em;color:var(--ink)}
h1{font-size:clamp(30px,4.2vw,46px);line-height:1.22}
h2{font-size:clamp(24px,3vw,32px);line-height:1.3}
h3{font-size:20px;line-height:1.4}
h4{font-size:17px;line-height:1.45}
p{font-size:16px;line-height:1.8}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{
  outline:2px solid var(--ink);
  outline-offset:2px;
  border-radius:4px;
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms !important;transition-duration:.01ms !important;scroll-behavior:auto !important}
}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}
@media (min-width:1440px){.container{max-width:1320px}}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:52px;padding:0 32px;border-radius:var(--radius-btn);
  font-size:16px;font-weight:600;letter-spacing:.01em;
  border:1px solid transparent;background:transparent;cursor:pointer;
  transition:background var(--ease),color var(--ease),border-color var(--ease),transform var(--ease),box-shadow var(--ease);
  white-space:nowrap;
}
.btn-sm{height:44px;padding:0 22px;font-size:15px}
.btn-primary{background:var(--accent);color:var(--canvas);border-color:var(--accent)}
.btn-primary:hover{background:var(--accent-hover);border-color:var(--accent-hover);transform:translateY(-1px);box-shadow:var(--shadow-hover)}
.btn-primary:active{transform:translateY(0);box-shadow:none}
.btn-primary:disabled{background:#C9C4B8;border-color:#C9C4B8;color:#4B4A45;cursor:not-allowed;transform:none;box-shadow:none}
.btn-ghost{background:transparent;border-color:var(--line-strong);color:var(--ink)}
.btn-ghost:hover{background:var(--ink);border-color:var(--ink);color:var(--canvas);transform:translateY(-1px)}
.btn-ghost:active{transform:translateY(0)}
.btn-light{background:var(--canvas);color:var(--ink);border-color:var(--canvas)}
.btn-light:hover{background:#fff;border-color:#fff;transform:translateY(-1px);box-shadow:0 18px 40px -28px rgba(0,0,0,.6)}
.btn-outline-light{background:transparent;border-color:rgba(245,241,232,.45);color:var(--canvas)}
.btn-outline-light:hover{background:var(--canvas);border-color:var(--canvas);color:var(--ink);transform:translateY(-1px)}
.btn-text{display:inline-flex;align-items:center;gap:8px;font-weight:600;color:var(--ink);transition:color var(--ease)}
.btn-text svg{transition:transform var(--ease)}
.btn-text:hover{color:var(--accent);text-decoration:underline;text-underline-offset:4px}
.btn-text:hover svg{transform:translateX(3px)}
.btn-group{display:flex;flex-wrap:wrap;gap:12px}

/* ---------- 头部导航 ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:80;
  color:var(--canvas);
  transition:background 240ms ease,color 240ms ease,border-color 240ms ease,backdrop-filter 240ms ease;
  border-bottom:1px solid transparent;
}
.site-header.is-scrolled{
  background:rgba(245,241,232,.94);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
  color:var(--ink);
}
.header-inner{display:flex;align-items:center;gap:32px;height:76px}
.brand{display:inline-flex;align-items:center;gap:10px;color:inherit;flex:0 0 auto}
.brand-mark{display:inline-flex;width:32px;height:32px}
.brand-mark svg{width:32px;height:32px}
.brand-text{font-size:19px;font-weight:600;letter-spacing:.04em}
.nav{display:flex;align-items:center;gap:28px;margin:0 auto}
.nav-link{
  position:relative;display:inline-block;
  font-size:15px;font-weight:500;letter-spacing:.02em;
  color:rgba(245,241,232,.82);
  padding:6px 0;transition:color var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;
  background:currentColor;transform:scaleX(0);transform-origin:left;
  transition:transform 200ms ease;
}
.nav-link:hover,.nav-link.is-active{color:var(--canvas)}
.nav-link:hover::after,.nav-link.is-active::after{transform:scaleX(1)}
.site-header.is-scrolled .nav-link{color:var(--text-2)}
.site-header.is-scrolled .nav-link:hover,.site-header.is-scrolled .nav-link.is-active{color:var(--ink)}
.header-actions{display:flex;align-items:center;gap:16px;flex:0 0 auto}
.header-divider{width:1px;height:24px;background:currentColor;opacity:.24}
.nav-toggle{
  display:none;align-items:center;justify-content:center;flex-direction:column;gap:5px;
  width:44px;height:44px;background:transparent;border:1px solid currentColor;border-radius:12px;
  cursor:pointer;padding:0;opacity:.85;transition:opacity var(--ease);
}
.nav-toggle:hover{opacity:1}
.nav-toggle span{display:block;width:18px;height:1px;background:currentColor;transition:transform 200ms ease,opacity 200ms ease}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* ---------- 首屏 ---------- */
.page-hero{position:relative;background:var(--ink);color:var(--canvas);overflow:hidden;padding:150px 0 84px}
.page-hero .hero-bg{
  position:absolute;inset:0;background-size:cover;background-position:center;
  opacity:.30;transform:scale(1.02);
}
.page-hero .hero-veil{
  position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(15,43,38,.94) 0%,rgba(15,43,38,.80) 55%,rgba(15,43,38,.92) 100%);
}
.hero-inner{position:relative;z-index:2;display:grid;grid-template-columns:1.32fr .88fr;gap:56px;align-items:center}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;
  padding:7px 14px;border:1px solid rgba(235,217,196,.36);border-radius:var(--radius-badge);
  font-size:12px;line-height:1.6;letter-spacing:.02em;color:var(--sand);
  font-variant-numeric:tabular-nums;
}
.hero-badge::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--accent);flex:0 0 auto}
.hero-copy h1{color:var(--canvas);margin:20px 0 0;max-width:16em}
.hero-sub{margin-top:16px;font-size:17px;line-height:1.85;color:rgba(245,241,232,.80);max-width:34em}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.hero-meta{margin-top:18px;font-size:12px;line-height:1.6;color:rgba(245,241,232,.62);font-variant-numeric:tabular-nums}
.hero-card{
  background:var(--card);color:var(--text);border:1px solid var(--line);
  border-radius:var(--radius-card);padding:26px 26px 18px;
}
.hero-card-title{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  font-size:14px;font-weight:600;color:var(--ink);
  padding-bottom:14px;border-bottom:1px solid var(--line);
}
.hero-card-title span{font-size:12px;font-weight:500;color:var(--text-3);font-variant-numeric:tabular-nums}
.hero-card dl{margin:0}
.hero-card dl > div{
  display:flex;align-items:baseline;justify-content:space-between;gap:16px;
  padding:13px 0;border-bottom:1px solid var(--line);
}
.hero-card dl > div:last-child{border-bottom:0}
.hero-card dt{font-size:14px;color:var(--text-2)}
.hero-card dd{font-size:15px;font-weight:500;color:var(--ink);font-variant-numeric:tabular-nums}

/* ---------- 板块通用 ---------- */
.section{padding:var(--space-section) 0}
.section-tight{padding:72px 0}
.section-alt{background:var(--layer);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:32px;margin-bottom:48px}
.section-head .lead{margin-top:12px;font-size:16px;line-height:1.8;color:var(--text-2);max-width:44em}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-size:14px;font-weight:600;letter-spacing:.04em;color:var(--ink);
}
.eyebrow::before{content:"";width:18px;height:2px;background:var(--accent);flex:0 0 auto}
.eyebrow + h2{margin-top:12px}

/* ---------- 平台长条卡 ---------- */
.platform-list{display:flex;flex-direction:column;gap:16px}
.platform-card{
  display:grid;grid-template-columns:250px 1fr auto;gap:32px;align-items:center;
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius-card);
  padding:24px 28px;transition:border-color var(--ease),transform var(--ease),box-shadow var(--ease);
}
.platform-card:hover{border-color:var(--line-strong);transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.platform-id{display:flex;align-items:center;gap:16px}
.pi-icon{
  display:inline-flex;align-items:center;justify-content:center;flex:0 0 auto;
  width:48px;height:48px;border-radius:12px;background:var(--layer);
  border:1px solid var(--line);color:var(--ink-soft);
}
.pi-icon svg{width:24px;height:24px}
.platform-id h3{font-size:18px}
.pi-tag{
  display:inline-block;margin-top:6px;padding:3px 8px;border-radius:var(--radius-badge);
  background:var(--sand);color:#6B3416;font-size:11px;font-weight:600;letter-spacing:.02em;
}
.spec{display:grid;grid-template-columns:1fr 1fr;gap:0 24px;margin:0}
.spec > div{padding:0;border-left:1px solid var(--line);padding-left:20px}
.spec dt{font-size:12px;font-weight:600;letter-spacing:.03em;color:var(--text-3);margin-bottom:6px}
.spec dd{margin:0 0 10px;font-size:14px;line-height:1.65;color:var(--text-2)}
.spec dd strong{display:block;font-size:15px;font-weight:500;color:var(--ink);font-variant-numeric:tabular-nums}
.spec dd:last-child{margin-bottom:0}
.platform-action{display:flex;flex-direction:column;align-items:flex-end;gap:8px}
.platform-action .micro{font-size:12px;color:var(--text-3);font-variant-numeric:tabular-nums}

/* ---------- 安装前核对 ---------- */
.check-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:56px;align-items:center}
.check-figure{position:relative;border-radius:var(--radius-img);overflow:hidden;border:1px solid var(--line);background:var(--layer)}
.check-figure img{width:100%;aspect-ratio:4/3;object-fit:cover}
.figure-tag{
  position:absolute;top:14px;left:14px;
  padding:5px 12px;border-radius:var(--radius-badge);
  background:rgba(15,43,38,.86);color:var(--canvas);
  font-size:11px;font-weight:600;letter-spacing:.03em;font-variant-numeric:tabular-nums;
}
.check-list{display:grid;grid-template-columns:1fr 1fr;gap:0 32px;margin-top:32px}
.check-list li{
  display:flex;gap:12px;align-items:flex-start;
  padding:16px 0;border-bottom:1px solid var(--line);
  font-size:15px;line-height:1.7;color:var(--text-2);
}
.check-list li svg{flex:0 0 auto;margin-top:4px;color:var(--ink-soft)}
.check-list li strong{display:block;font-size:15px;font-weight:600;color:var(--ink);margin-bottom:2px}
.note-block{
  margin-top:32px;padding:18px 22px;
  background:var(--card);border-left:3px solid var(--accent);border-radius:0 10px 10px 0;
  font-size:14px;line-height:1.85;color:var(--text-2);
}
.note-block strong{color:var(--ink)}

/* ---------- FAQ ---------- */
.faq-wrap{max-width:880px}
.faq-list{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{
  display:flex;align-items:center;justify-content:space-between;gap:24px;
  width:100%;min-height:64px;padding:18px 0;
  background:transparent;border:0;cursor:pointer;text-align:left;
  font-size:17px;font-weight:600;color:var(--ink);line-height:1.5;
  transition:color var(--ease);
}
.faq-q:hover{color:var(--accent)}
.faq-icon{
  position:relative;flex:0 0 auto;width:26px;height:26px;border:1px solid var(--line-strong);border-radius:50%;
  transition:transform var(--ease),border-color var(--ease);
}
.faq-icon::before,.faq-icon::after{
  content:"";position:absolute;top:50%;left:50%;background:var(--ink);
  transform:translate(-50%,-50%);transition:background var(--ease);
}
.faq-icon::before{width:11px;height:1px}
.faq-icon::after{width:1px;height:11px}
.faq-item.is-open .faq-icon{transform:rotate(45deg);border-color:var(--accent)}
.faq-item.is-open .faq-icon::before,.faq-item.is-open .faq-icon::after{background:var(--accent)}
.faq-a{max-height:0;overflow:hidden;transition:max-height 260ms ease}
.faq-item.is-open .faq-a{max-height:360px}
.faq-a p{padding:0 0 22px;max-width:720px;font-size:15px;line-height:1.85;color:var(--text-2)}

/* ---------- 脚注说明 ---------- */
.footnote{
  border-top:1px solid var(--line);padding-top:28px;
  display:grid;grid-template-columns:auto 1fr;gap:32px;align-items:start;
}
.footnote h3{font-size:14px;font-weight:600;color:var(--ink);letter-spacing:.02em;white-space:nowrap}
.footnote p{font-size:12px;line-height:1.9;color:var(--text-3);max-width:78em}

/* ---------- 下载窄条 ---------- */
.download-band{background:var(--ink);color:var(--canvas);padding:72px 0}
.download-inner{display:grid;grid-template-columns:1fr auto;gap:48px;align-items:center}
.download-band h2{color:var(--canvas)}
.download-band p{margin-top:12px;font-size:15px;line-height:1.8;color:rgba(245,241,232,.76);max-width:38em}
.download-actions{display:flex;flex-direction:column;align-items:flex-end;gap:14px}
.download-actions .micro{font-size:12px;line-height:1.6;color:rgba(245,241,232,.60);text-align:right;font-variant-numeric:tabular-nums}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--ink);color:rgba(245,241,232,.76);padding:72px 0 32px;border-top:1px solid rgba(245,241,232,.12)}
.footer-grid{display:grid;grid-template-columns:4fr 2fr 3fr 3fr;gap:48px}
.footer-brand .brand{color:var(--canvas);margin-bottom:18px}
.footer-brand p{font-size:14px;line-height:1.85;color:rgba(245,241,232,.66);max-width:34em}
.footer-title{font-size:14px;font-weight:600;color:var(--canvas);letter-spacing:.03em;margin-bottom:16px}
.footer-list li{margin-bottom:10px;font-size:14px;line-height:1.7}
.footer-list a{color:rgba(245,241,232,.72);transition:color var(--ease)}
.footer-list a:hover{color:var(--canvas);text-decoration:underline;text-underline-offset:4px}
.footer-list span{color:rgba(245,241,232,.62)}
.footer-band{
  display:flex;align-items:center;justify-content:space-between;gap:24px;
  margin-top:56px;padding:20px 24px;border:1px solid rgba(245,241,232,.18);border-radius:var(--radius-card);
}
.footer-band p{font-size:14px;line-height:1.7;color:rgba(245,241,232,.76)}
.footer-bottom{
  display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap;
  margin-top:32px;padding-top:24px;border-top:1px solid rgba(245,241,232,.14);
  font-size:12px;color:rgba(245,241,232,.62);
}
.footer-bottom nav{display:flex;flex-wrap:wrap;gap:18px}
.footer-bottom a{color:rgba(245,241,232,.66);transition:color var(--ease)}
.footer-bottom a:hover{color:var(--canvas)}

/* ---------- 响应式 ---------- */
@media (max-width:1023px){
  :root{--space-section:72px}
  .nav{
    position:fixed;top:76px;left:0;right:0;bottom:0;
    display:flex;flex-direction:column;align-items:stretch;gap:0;
    margin:0;padding:12px 24px 32px;background:var(--canvas);
    border-top:1px solid var(--line);
    opacity:0;visibility:hidden;transform:translateY(-8px);
    transition:opacity 200ms ease,transform 200ms ease,visibility 200ms ease;
    overflow-y:auto;
  }
  .nav.is-open{opacity:1;visibility:visible;transform:none}
  .nav-link{
    display:block;width:100%;height:56px;line-height:56px;padding:0;
    font-size:18px;font-weight:500;color:var(--text);
    border-bottom:1px solid var(--line);
  }
  .nav-link::after{display:none}
  .nav-link:hover,.nav-link.is-active{color:var(--ink);font-weight:600}
  .nav-toggle{display:flex}
  .header-divider{display:none}
  .hero-inner{grid-template-columns:1fr;gap:36px}
  .hero-copy h1{max-width:none}
  .page-hero{padding:132px 0 64px}
  .platform-card{grid-template-columns:1fr auto;gap:20px 24px}
  .platform-id{grid-column:1 / -1}
  .platform-action{align-items:flex-start}
  .platform-action .micro{text-align:left}
  .check-grid{grid-template-columns:1fr;gap:36px}
  .section-head{flex-direction:column;align-items:flex-start;gap:20px;margin-bottom:36px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:40px}
  .download-inner{grid-template-columns:1fr;gap:32px}
  .download-actions{align-items:flex-start}
  .download-actions .micro{text-align:left}
}
@media (max-width:767px){
  :root{--space-section:56px}
  .container{padding:0 20px}
  h1{font-size:30px}
  .hero-inner{gap:28px}
  .hero-sub{font-size:16px}
  .platform-card{padding:20px;grid-template-columns:1fr}
  .spec{grid-template-columns:1fr;gap:16px}
  .spec > div{border-left:0;border-top:1px solid var(--line);padding-left:0;padding-top:14px}
  .spec > div:first-child{border-top:0;padding-top:0}
  .platform-action{align-items:stretch}
  .platform-action .btn{width:100%}
  .check-list{grid-template-columns:1fr;margin-top:24px}
  .footnote{grid-template-columns:1fr;gap:12px}
  .faq-q{font-size:16px;gap:16px}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .footer-band{flex-direction:column;align-items:flex-start;padding:20px}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:12px}
  .btn-group{width:100%}
}
@media (max-width:400px){
  .btn,.btn-sm{width:100%}
  .hero-cta .btn{width:100%}
  .platform-action .btn{width:100%}
}

/* roulang page: category4 */
:root{
  --ink:#0F2B26;
  --ink-2:#16453C;
  --ink-hover:#0A1F1B;
  --accent:#A9491F;
  --accent-hover:#8C3A16;
  --accent-soft:#EBD9C4;
  --canvas:#F5F1E8;
  --layer:#F0EBDF;
  --card:#FFFCF6;
  --text:#1C2420;
  --muted:#5A615C;
  --faint:#8A908B;
  --ok:#2F6B4F;
  --disabled:#C9C4B8;
  --line:rgba(15,43,38,.12);
  --line-accent:rgba(169,73,31,.28);
  --radius-card:16px;
  --radius-img:12px;
  --radius-input:10px;
  --radius-badge:6px;
  --pill:999px;
  --shadow-hover:0 18px 40px -28px rgba(15,43,38,.45);
  --container:1200px;
  --t:180ms ease;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  font-size:16px;
  line-height:1.8;
  color:var(--text);
  background:var(--canvas);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0;}
ul,ol{padding:0;list-style:none;}
a{color:inherit;text-decoration:none;transition:color var(--t),border-color var(--t),background-color var(--t),opacity var(--t);}
img{max-width:100%;display:block;}
button,input,select,textarea{font:inherit;color:inherit;}
button{cursor:pointer;}
:focus-visible{outline:2px solid var(--ink);outline-offset:2px;border-radius:4px;}
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px;}

/* ---------- header ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:120;
  background:transparent;
  transition:background-color 240ms ease,border-color 240ms ease,box-shadow 240ms ease;
  border-bottom:1px solid transparent;
}
.site-header.is-scrolled{
  background:rgba(245,241,232,.94);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border-bottom-color:var(--line);
}
.header-inner{display:flex;align-items:center;gap:28px;height:76px;}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;}
.brand-mark{display:inline-flex;width:30px;height:30px;color:var(--ink);}
.brand-mark svg{width:100%;height:100%;}
.brand-text{font-size:18px;font-weight:600;letter-spacing:.04em;color:var(--ink);}
.nav{display:flex;align-items:center;gap:26px;margin-left:auto;}
.nav-link{
  position:relative;font-size:15px;font-weight:500;letter-spacing:.02em;
  color:var(--muted);padding:6px 0 8px;
}
.nav-link::after{
  content:"";position:absolute;left:0;bottom:0;height:2px;width:0;
  background:var(--ink);transition:width 200ms ease;
}
.nav-link:hover{color:var(--ink);}
.nav-link:hover::after{width:100%;}
.nav-link.is-active{color:var(--ink);font-weight:600;}
.nav-link.is-active::after{width:100%;}
.header-actions{display:flex;align-items:center;gap:16px;flex-shrink:0;}
.header-divider{width:1px;height:22px;background:var(--line);display:inline-block;}
.nav-toggle{
  display:none;flex-direction:column;justify-content:center;align-items:center;gap:5px;
  width:44px;height:44px;border:1px solid var(--line);border-radius:10px;background:transparent;
}
.nav-toggle span{display:block;width:18px;height:1.5px;background:var(--ink);transition:transform var(--t),opacity var(--t);}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 28px;border-radius:var(--pill);
  font-size:15px;font-weight:600;letter-spacing:.01em;
  border:1px solid transparent;background:transparent;
  transition:background-color var(--t),color var(--t),border-color var(--t),transform var(--t),box-shadow var(--t);
  white-space:nowrap;
}
.btn-primary{background:var(--accent);color:#FDF8F0;border-color:var(--accent);}
.btn-primary:hover{background:var(--accent-hover);border-color:var(--accent-hover);transform:translateY(-1px);box-shadow:var(--shadow-hover);}
.btn-primary:active{transform:translateY(0);box-shadow:none;}
.btn-outline{background:transparent;color:var(--ink);border-color:var(--ink);}
.btn-outline:hover{background:var(--ink);color:var(--canvas);transform:translateY(-1px);}
.btn-outline:active{transform:translateY(0);}
.btn-sm{height:40px;padding:0 20px;font-size:14px;}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--disabled);border-color:var(--disabled);color:#5C5A52;cursor:not-allowed;transform:none;box-shadow:none;}
.link-arrow{
  display:inline-flex;align-items:center;gap:8px;font-size:15px;font-weight:600;color:var(--ink);
  border-bottom:1px solid transparent;padding-bottom:2px;transition:border-color var(--t),gap var(--t);
}
.link-arrow svg{width:16px;height:16px;transition:transform var(--t);}
.link-arrow:hover{border-bottom-color:var(--ink);gap:11px;}
.link-arrow:hover svg{transform:translateX(3px);}

/* ---------- hero ---------- */
.hero{padding:150px 0 72px;}
.hero-grid{display:grid;grid-template-columns:1.22fr 1fr;gap:56px;align-items:center;}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12px;letter-spacing:.04em;color:var(--muted);
  border:1px solid var(--line);border-radius:var(--pill);
  padding:6px 14px;background:rgba(255,252,246,.7);
}
.eyebrow i{width:6px;height:6px;border-radius:50%;background:var(--accent);display:inline-block;}
h1{
  font-size:clamp(30px,4.2vw,44px);line-height:1.22;font-weight:600;letter-spacing:.01em;
  color:var(--ink);margin-top:22px;
}
.hero-lead{font-size:17px;line-height:1.85;color:var(--muted);max-width:36em;margin-top:20px;}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px;}
.hero-meta{
  font-size:12px;color:var(--faint);margin-top:20px;line-height:1.7;
  display:flex;flex-wrap:wrap;gap:6px 14px;
}
.hero-meta span{position:relative;}
.hero-meta span + span::before{content:"";display:inline-block;width:1px;height:10px;background:var(--line);margin-right:14px;vertical-align:middle;}
.hero-media{position:relative;}
.hero-media img{
  width:100%;aspect-ratio:4/3;object-fit:cover;
  border-radius:var(--radius-img);border:1px solid var(--line);
}
.media-tag{
  position:absolute;top:16px;left:16px;
  background:rgba(255,252,246,.94);border:1px solid var(--line);
  border-radius:var(--radius-badge);padding:6px 10px;font-size:12px;color:var(--ink-2);
  letter-spacing:.02em;
}
.media-note{
  position:absolute;left:16px;right:16px;bottom:16px;
  background:rgba(255,252,246,.95);border:1px solid var(--line);
  border-radius:var(--radius-input);padding:12px 14px;
  display:flex;justify-content:space-between;gap:14px;
  font-size:12px;color:var(--muted);
}
.media-note strong{color:var(--ink);font-weight:600;font-variant-numeric:tabular-nums;}

/* ---------- stats ---------- */
.stats{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--layer);}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);}
.stat{padding:34px 24px;border-left:1px solid var(--line);}
.stat:first-child{border-left:none;padding-left:0;}
.stat-num{font-size:32px;font-weight:600;color:var(--ink);line-height:1.2;font-variant-numeric:tabular-nums;letter-spacing:.01em;}
.stat-num em{font-style:normal;font-size:16px;color:var(--muted);margin-left:4px;font-weight:500;}
.stat-label{font-size:12px;color:var(--muted);margin-top:8px;letter-spacing:.02em;}

/* ---------- section base ---------- */
.section{padding:88px 0;}
.section--line{border-top:1px solid var(--line);}
.section--layer{background:var(--layer);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:28px;margin-bottom:40px;}
.section-head h2{font-size:clamp(24px,3vw,32px);line-height:1.3;font-weight:600;color:var(--ink);letter-spacing:.01em;}
.section-head p{font-size:14px;color:var(--muted);margin-top:10px;max-width:46em;line-height:1.75;}
.section-head .link-arrow{margin-bottom:6px;flex-shrink:0;}

/* ---------- review wall ---------- */
.review-columns{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:start;}
.review-col{display:grid;gap:24px;}
.review-col--offset{padding-top:52px;}
.review-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius-card);
  padding:24px;transition:transform var(--t),border-color var(--t),box-shadow var(--t);
}
.review-card:hover{transform:translateY(-2px);border-color:var(--line-accent);box-shadow:var(--shadow-hover);}
.review-card p{font-size:15px;line-height:1.8;color:var(--text);}
.review-foot{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  margin-top:18px;padding-top:16px;border-top:1px solid var(--line);
}
.author{display:flex;align-items:center;gap:10px;min-width:0;}
.avatar{
  width:40px;height:40px;border-radius:50%;flex-shrink:0;
  background:var(--accent-soft);color:var(--ink);
  display:inline-flex;align-items:center;justify-content:center;
  font-size:15px;font-weight:600;
}
.author-name{font-size:14px;font-weight:600;color:var(--ink);line-height:1.4;}
.author-meta{font-size:12px;color:var(--faint);line-height:1.4;margin-top:2px;}
.dots{display:flex;gap:4px;flex-shrink:0;}
.dots i{width:8px;height:8px;border-radius:50%;background:rgba(15,43,38,.14);display:block;}
.dots i.on{background:var(--accent);}

/* ---------- pull quote ---------- */
.quote-block{
  background:var(--accent-soft);border-radius:var(--radius-card);
  padding:52px 56px;
}
.quote-block blockquote{
  font-size:20px;line-height:1.7;color:var(--ink);max-width:34em;
}
.quote-block cite{
  display:block;margin-top:22px;font-size:14px;font-style:normal;color:var(--muted);
  text-align:right;
}

/* ---------- score board ---------- */
.score-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;}
.score-list{border-top:1px solid var(--line);}
.score-row{
  display:grid;grid-template-columns:120px 1fr 46px;align-items:center;gap:16px;
  padding:16px 0;border-bottom:1px solid var(--line);
}
.score-name{font-size:14px;color:var(--muted);}
.score-bar{height:6px;border-radius:var(--pill);background:rgba(15,43,38,.1);overflow:hidden;}
.score-bar span{display:block;height:100%;border-radius:var(--pill);background:var(--accent);}
.score-val{font-size:15px;font-weight:600;color:var(--ink);text-align:right;font-variant-numeric:tabular-nums;}
.score-figure img{
  width:100%;aspect-ratio:16/10;object-fit:cover;border-radius:var(--radius-img);border:1px solid var(--line);
}
.score-figure figcaption{font-size:12px;color:var(--faint);margin-top:12px;line-height:1.7;}

/* ---------- faq ---------- */
.faq-wrap{max-width:880px;}
.faq-item{border-bottom:1px solid var(--line);}
.faq-item:first-child{border-top:1px solid var(--line);}
.faq-q{
  width:100%;min-height:64px;display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:18px 0;background:transparent;border:none;text-align:left;
  font-size:17px;font-weight:600;color:var(--ink);line-height:1.5;
}
.faq-q:hover{color:var(--accent);}
.faq-icon{position:relative;width:18px;height:18px;flex-shrink:0;transition:transform 220ms ease;}
.faq-icon::before,.faq-icon::after{
  content:"";position:absolute;background:var(--ink-2);border-radius:2px;
}
.faq-icon::before{left:0;top:8px;width:18px;height:1.6px;}
.faq-icon::after{left:8px;top:0;width:1.6px;height:18px;}
.faq-item.is-open .faq-icon{transform:rotate(45deg);}
.faq-item.is-open .faq-icon::before,.faq-item.is-open .faq-icon::after{background:var(--accent);}
.faq-a{max-height:0;overflow:hidden;transition:max-height 260ms ease;}
.faq-item.is-open .faq-a{max-height:420px;}
.faq-a-inner{
  font-size:15px;line-height:1.85;color:var(--muted);
  padding:0 0 20px;max-width:720px;
}

/* ---------- download band ---------- */
.download-band{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius-card);
  padding:34px;display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;
}
.download-copy h2{font-size:24px;line-height:1.35;font-weight:600;color:var(--ink);}
.download-copy p{font-size:14px;color:var(--muted);margin-top:8px;max-width:32em;}
.dl-btns{display:grid;grid-template-columns:repeat(3,auto);gap:12px;}
.btn-plat{
  display:inline-flex;align-items:center;gap:8px;height:48px;padding:0 20px;
  border-radius:var(--pill);border:1px solid var(--ink);background:transparent;color:var(--ink);
  font-size:14px;font-weight:600;
  transition:background-color var(--t),color var(--t),border-color var(--t),transform var(--t);
}
.btn-plat svg{width:17px;height:17px;stroke:currentColor;fill:none;stroke-width:1.5;}
.btn-plat:hover{background:var(--ink);color:var(--canvas);transform:translateY(-1px);}
.btn-plat.is-primary{background:var(--accent);border-color:var(--accent);color:#FDF8F0;}
.btn-plat.is-primary:hover{background:var(--accent-hover);border-color:var(--accent-hover);}
.fineprint{font-size:12px;color:var(--faint);line-height:1.7;margin-top:16px;}

/* ---------- footer ---------- */
.site-footer{background:var(--ink);color:var(--canvas);padding:72px 0 28px;margin-top:0;}
.footer-grid{display:grid;grid-template-columns:1.6fr .8fr .8fr 1.1fr;gap:44px;}
.site-footer .brand-text{color:var(--canvas);}
.site-footer .brand-mark{color:var(--canvas);}
.footer-brand p{font-size:14px;line-height:1.85;color:rgba(245,241,232,.7);margin-top:16px;max-width:32em;}
.footer-title{font-size:14px;font-weight:600;letter-spacing:.03em;margin-bottom:16px;color:var(--canvas);}
.footer-list{display:grid;gap:10px;}
.footer-list li{font-size:14px;color:rgba(245,241,232,.72);line-height:1.7;}
.footer-list a{color:rgba(245,241,232,.72);border-bottom:1px solid transparent;padding-bottom:1px;}
.footer-list a:hover{color:var(--canvas);border-bottom-color:rgba(245,241,232,.5);}
.footer-band{
  margin-top:44px;border:1px solid rgba(245,241,232,.18);border-radius:var(--radius-card);
  padding:24px 26px;display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap;
}
.footer-band p{font-size:14px;color:rgba(245,241,232,.78);line-height:1.7;}
.footer-bottom{
  margin-top:32px;padding-top:20px;border-top:1px solid rgba(245,241,232,.16);
  display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap;
  font-size:12px;color:rgba(245,241,232,.62);line-height:1.7;
}
.footer-bottom nav{display:flex;flex-wrap:wrap;gap:6px 18px;}
.footer-bottom a{color:rgba(245,241,232,.62);}
.footer-bottom a:hover{color:var(--canvas);}

/* ---------- responsive ---------- */
@media (max-width:1279px){
  .container{max-width:1080px;}
  .hero-grid{gap:44px;}
}
@media (max-width:1023px){
  .nav-toggle{display:flex;}
  .header-divider{display:none;}
  .nav{
    position:fixed;top:76px;left:0;right:0;bottom:0;
    flex-direction:column;align-items:stretch;gap:0;margin-left:0;
    background:var(--canvas);padding:16px 24px 40px;
    border-top:1px solid var(--line);
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity 220ms ease,transform 220ms ease,visibility 220ms ease;
    overflow-y:auto;
  }
  .nav.is-open{opacity:1;visibility:visible;transform:translateY(0);}
  .nav-link{font-size:18px;line-height:56px;padding:0;border-bottom:1px solid var(--line);color:var(--ink);}
  .nav-link::after{display:none;}
  .nav-link.is-active{color:var(--accent);}
  .hero{padding:132px 0 56px;}
  .hero-grid{grid-template-columns:1fr;gap:36px;}
  .hero-media{max-width:560px;}
  .stats-grid{grid-template-columns:repeat(2,1fr);}
  .stat{border-left:1px solid var(--line);padding:26px 20px;}
  .stat:nth-child(odd){border-left:none;padding-left:0;}
  .stat:nth-child(3),.stat:nth-child(4){border-top:1px solid var(--line);}
  .section{padding:72px 0;}
  .section-head{flex-direction:column;align-items:flex-start;gap:14px;}
  .review-columns{grid-template-columns:1fr;}
  .review-col--offset{padding-top:0;}
  .score-grid{grid-template-columns:1fr;gap:36px;}
  .quote-block{padding:40px 32px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:36px;}
  .download-band{flex-direction:column;align-items:flex-start;}
}
@media (max-width:767px){
  .container{padding:0 20px;}
  .header-inner{height:68px;gap:16px;}
  .nav{top:68px;}
  .brand-text{font-size:17px;}
  .header-actions .btn-sm{display:none;}
  .hero{padding:112px 0 48px;}
  h1{font-size:30px;}
  .hero-lead{font-size:16px;}
  .hero-cta .btn{width:100%;}
  .section{padding:56px 0;}
  .stat-num{font-size:28px;}
  .stats-grid{grid-template-columns:1fr;}
  .stat{border-left:none;padding:20px 0;}
  .stat:nth-child(2),.stat:nth-child(3),.stat:nth-child(4){border-top:1px solid var(--line);}
  .review-card{padding:20px;}
  .quote-block{padding:32px 22px;}
  .quote-block blockquote{font-size:18px;}
  .score-row{grid-template-columns:96px 1fr 42px;gap:12px;}
  .dl-btns{grid-template-columns:1fr;width:100%;}
  .btn-plat{width:100%;justify-content:center;}
  .download-band{padding:24px 20px;}
  .footer-grid{grid-template-columns:1fr;}
  .site-footer{padding:56px 0 24px;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
  .media-note{position:static;margin-top:12px;left:auto;right:auto;bottom:auto;}
}
@media (max-width:400px){
  .hero-cta{flex-direction:column;}
  .btn{width:100%;}
  .hero-meta{font-size:11px;}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important;scroll-behavior:auto !important;}
}
body.nav-open{overflow:hidden;}

/* roulang page: category5 */
:root{
  --ink:#0F2B26;
  --ink-2:#16453C;
  --accent:#A9491F;
  --accent-hover:#8C3A16;
  --accent-soft:#EBD9C4;
  --canvas:#F5F1E8;
  --layer:#F0EBDF;
  --card:#FFFCF6;
  --text:#1C2420;
  --text-2:#5A615C;
  --text-3:#8A908B;
  --line:rgba(15,43,38,.12);
  --line-accent:rgba(169,73,31,.28);
  --success:#2F6B4F;
  --radius-card:16px;
  --radius-img:12px;
  --radius-input:10px;
  --radius-badge:6px;
  --shadow-hover:0 18px 40px -28px rgba(15,43,38,.45);
  --container:1200px;
  --header-h:70px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  padding-top:var(--header-h);
  font-family:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  font-size:16px;
  line-height:1.8;
  color:var(--text);
  background:var(--canvas);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;cursor:pointer}
ul,ol{margin:0;padding:0;list-style:none}
p{margin:0 0 1.1em}
h1,h2,h3,h4{margin:0;font-weight:600;color:var(--ink);letter-spacing:.01em}
h1{font-size:clamp(30px,4.2vw,44px);line-height:1.22}
h2{font-size:clamp(24px,3vw,32px);line-height:1.3}
h3{font-size:20px;line-height:1.4}
h4{font-size:17px;line-height:1.45}
::selection{background:var(--accent-soft);color:var(--ink)}
:focus-visible{outline:2px solid var(--ink);outline-offset:2px;border-radius:4px}

.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px}

/* ---------- header ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:200;
  background:rgba(245,241,232,.92);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
  transition:box-shadow .18s ease;
}
.site-header.is-scrolled{box-shadow:0 14px 34px -28px rgba(15,43,38,.75)}
.header-inner{display:flex;align-items:center;gap:32px;height:var(--header-h)}
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--ink);flex:none}
.brand-mark{width:32px;height:32px;display:inline-flex;color:var(--ink)}
.brand-mark svg{width:100%;height:100%}
.brand-text{font-weight:600;letter-spacing:.04em;font-size:17px;white-space:nowrap}
.nav{display:flex;align-items:center;gap:26px;margin-left:auto}
.nav-link{position:relative;display:inline-block;padding:6px 0;font-size:15px;font-weight:500;letter-spacing:.02em;color:var(--text-2);transition:color .18s ease}
.nav-link::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;background:var(--ink);transition:width .2s ease}
.nav-link:hover{color:var(--ink)}
.nav-link:hover::after{width:100%}
.nav-link.is-active{color:var(--ink);font-weight:600}
.nav-link.is-active::after{width:100%}
.header-actions{display:flex;align-items:center;gap:16px;flex:none}
.header-divider{width:1px;height:20px;background:var(--line)}
.nav-toggle{
  display:none;position:relative;width:44px;height:44px;border:0;background:transparent;
  align-items:center;justify-content:center;flex-direction:column;gap:5px;
}
.nav-toggle span{display:block;width:20px;height:1px;background:var(--ink);transition:transform .2s ease,opacity .2s ease}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:52px;padding:0 32px;border-radius:999px;border:1px solid transparent;
  font-size:15px;font-weight:600;letter-spacing:.01em;line-height:1;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease,transform .18s ease,box-shadow .18s ease;
}
.btn-primary{background:var(--accent);color:var(--canvas)}
.btn-primary:hover{background:var(--accent-hover);transform:translateY(-1px);box-shadow:var(--shadow-hover)}
.btn-primary:active{transform:translateY(0);box-shadow:none}
.btn-ghost{background:transparent;border-color:var(--ink);color:var(--ink)}
.btn-ghost:hover{background:var(--ink);color:var(--canvas)}
.btn-ghost:active{transform:translateY(0)}
.btn-sm{height:40px;padding:0 22px;font-size:14px}
.btn-block{width:100%}
.link-cta{display:inline-flex;align-items:center;gap:6px;color:var(--ink);font-weight:600;font-size:15px;border-bottom:1px solid transparent;transition:border-color .18s ease,color .18s ease}
.link-cta::after{content:"→";transition:transform .18s ease}
.link-cta:hover{border-bottom-color:var(--ink)}
.link-cta:hover::after{transform:translateX(3px)}

/* ---------- breadcrumb ---------- */
.crumb{padding:22px 0 0;font-size:12px;color:var(--text-3);letter-spacing:.02em}
.crumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.crumb li::after{content:"/";margin-left:8px;color:var(--text-3)}
.crumb li:last-child::after{display:none}
.crumb a{color:var(--text-2);transition:color .18s ease}
.crumb a:hover{color:var(--ink)}
.crumb li:last-child{color:var(--ink-2);font-weight:500}

/* ---------- hero ---------- */
.hero{padding:34px 0 64px}
.hero-grid{display:grid;grid-template-columns:7fr 5fr;gap:48px;align-items:center}
.badge-line{display:inline-flex;align-items:center;gap:10px;padding:7px 14px;border:1px solid var(--line);border-radius:var(--radius-badge);background:rgba(255,252,246,.7);font-size:12px;letter-spacing:.06em;color:var(--text-2)}
.badge-line i{display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--success);flex:none}
.hero h1{margin:20px 0 16px}
.hero-lead{font-size:17px;line-height:1.85;color:var(--text-2);max-width:34em}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin:28px 0 14px}
.micro{font-size:12px;line-height:1.6;color:var(--text-3);letter-spacing:.02em}
.hero-figure{position:relative}
.hero-figure img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:var(--radius-img);border:1px solid var(--line)}
.hero-tag{position:absolute;top:14px;left:14px;padding:6px 12px;border-radius:var(--radius-badge);background:rgba(15,43,38,.86);color:var(--canvas);font-size:12px;letter-spacing:.04em}
.hero-note{margin-top:14px;display:flex;align-items:center;gap:12px;padding:12px 14px;border:1px solid var(--line);border-radius:var(--radius-input);background:var(--card)}
.hero-note span.dot{width:8px;height:8px;border-radius:50%;background:var(--accent);flex:none}

/* ---------- anchor nav ---------- */
.anchor-bar{position:sticky;top:var(--header-h);z-index:120;background:rgba(245,241,232,.95);border-top:1px solid var(--line);border-bottom:1px solid var(--line);backdrop-filter:blur(10px)}
.anchor-scroll{display:flex;gap:10px;overflow-x:auto;padding:12px 0;scrollbar-width:none}
.anchor-scroll::-webkit-scrollbar{display:none}
.anchor-pill{flex:none;display:inline-flex;align-items:center;height:36px;padding:0 18px;border-radius:999px;border:1px solid var(--line);font-size:14px;color:var(--text-2);background:var(--card);transition:all .18s ease;white-space:nowrap}
.anchor-pill:hover{border-color:var(--ink);color:var(--ink)}
.anchor-pill.is-active{background:var(--ink);border-color:var(--ink);color:var(--canvas)}

/* ---------- sections ---------- */
.section{padding:72px 0}
.section-tight{padding:56px 0}
.section-alt{background:var(--layer);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{max-width:760px;margin-bottom:36px}
.section-head .eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:13px;font-weight:600;color:var(--accent);letter-spacing:.06em;margin-bottom:12px}
.section-head .eyebrow::before{content:"";display:block;width:16px;height:2px;background:var(--accent)}
.section-head h2{margin-bottom:12px}
.section-head p{color:var(--text-2);font-size:16px;margin:0}

/* ---------- faq ---------- */
.faq-group{margin-bottom:56px}
.faq-group:last-of-type{margin-bottom:0}
.faq-group-title{display:flex;align-items:baseline;gap:14px;margin-bottom:8px}
.faq-group-title h3{font-size:20px}
.faq-group-title span{font-size:13px;color:var(--text-3);letter-spacing:.04em}
.faq-list{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:24px;
  min-height:64px;padding:16px 0;border:0;background:transparent;text-align:left;
  font-size:17px;font-weight:600;color:var(--ink);line-height:1.5;transition:color .18s ease;
}
.faq-q:hover{color:var(--accent)}
.faq-q:focus-visible{outline:2px solid var(--ink);outline-offset:2px}
.faq-icon{position:relative;flex:none;width:22px;height:22px;border:1px solid var(--line);border-radius:50%;transition:border-color .18s ease,transform .22s ease}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;top:50%;left:50%;background:var(--ink-2);border-radius:1px;transition:background-color .18s ease,opacity .18s ease}
.faq-icon::before{width:9px;height:1.5px;transform:translate(-50%,-50%)}
.faq-icon::after{width:1.5px;height:9px;transform:translate(-50%,-50%)}
.faq-item.is-open .faq-icon{transform:rotate(45deg);border-color:var(--accent)}
.faq-item.is-open .faq-icon::before,.faq-item.is-open .faq-icon::after{background:var(--accent)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease}
.faq-item.is-open .faq-a{max-height:420px}
.faq-a-inner{max-width:720px;padding:0 0 20px;font-size:15px;line-height:1.85;color:var(--text-2)}
.faq-a-inner strong{color:var(--ink-2);font-weight:600}
.faq-a-inner p:last-child{margin-bottom:0}
.faq-tip{margin-top:12px;padding:12px 16px;background:var(--card);border-left:3px solid var(--accent);border-radius:0 var(--radius-input) var(--radius-input) 0;font-size:14px;line-height:1.75;color:var(--text-2)}

/* ---------- contact ---------- */
.contact-grid{display:grid;grid-template-columns:4fr 8fr;gap:48px;align-items:start}
.contact-info h2{margin-bottom:14px}
.contact-info p{color:var(--text-2);font-size:15px;line-height:1.85}
.fact-list{margin-top:24px;border-top:1px solid var(--line)}
.fact-row{display:flex;gap:16px;padding:14px 0;border-bottom:1px solid var(--line);font-size:14px;line-height:1.7}
.fact-row dt{flex:none;width:76px;color:var(--text-3)}
.fact-row dd{margin:0;color:var(--text)}
.fact-row dd a{color:var(--ink-2);border-bottom:1px solid var(--line-accent)}
.fact-row dd a:hover{color:var(--accent)}

.form-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius-card);padding:32px}
.form-card h3{margin-bottom:6px}
.form-card .form-sub{font-size:14px;color:var(--text-2);margin-bottom:24px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.form-row{margin-bottom:18px}
.form-row.full{grid-column:1/-1}
label{display:block;font-size:14px;font-weight:500;color:var(--text-2);margin-bottom:8px}
label .req{color:var(--accent)}
input[type="text"],input[type="email"],input[type="tel"],select,textarea{
  width:100%;height:48px;padding:0 14px;border:1px solid var(--line);border-radius:var(--radius-input);
  background:var(--canvas);color:var(--text);font-size:15px;font-family:inherit;
  transition:border-color .18s ease,box-shadow .18s ease,background-color .18s ease;
  -webkit-appearance:none;appearance:none;
}
select{
  background-image:url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%235A615C' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 14px center;padding-right:38px;
}
textarea{height:auto;min-height:120px;padding:12px 14px;line-height:1.7;resize:vertical}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--ink);background:var(--card);box-shadow:0 0 0 3px rgba(15,43,38,.12)}
input::placeholder,textarea::placeholder{color:var(--text-3)}
.form-hint{font-size:12px;color:var(--text-3);margin-top:12px;line-height:1.7}
.form-alert{
  display:flex;align-items:flex-start;gap:10px;margin-bottom:20px;padding:14px 16px;
  border:1px solid rgba(47,107,79,.32);background:rgba(47,107,79,.08);border-radius:var(--radius-input);
  font-size:14px;line-height:1.7;color:var(--success);
}
.form-alert::before{content:"";flex:none;width:8px;height:8px;margin-top:8px;border-radius:50%;background:var(--success)}

/* ---------- download band ---------- */
.download-band{padding:56px 0}
.band-inner{
  display:grid;grid-template-columns:1fr auto;gap:40px;align-items:center;
  padding:40px;border:1px solid var(--line);border-radius:var(--radius-card);background:var(--card);
}
.band-inner h2{font-size:clamp(22px,2.4vw,28px);margin-bottom:10px}
.band-inner p{color:var(--text-2);font-size:15px;margin:0}
.band-actions{display:flex;flex-wrap:wrap;gap:12px}
.band-micro{grid-column:1/-1;font-size:12px;color:var(--text-3);margin:0;padding-top:20px;border-top:1px solid var(--line)}

/* ---------- footer ---------- */
.site-footer{background:var(--ink);color:var(--canvas);padding:64px 0 28px;margin-top:24px}
.site-footer .brand{color:var(--canvas)}
.site-footer .brand-mark{color:var(--canvas)}
.footer-grid{display:grid;grid-template-columns:4fr 2fr 3fr 3fr;gap:40px;padding-bottom:44px}
.footer-brand p{font-size:14px;line-height:1.85;color:rgba(245,241,232,.72);margin:18px 0 0;max-width:34em}
.footer-title{font-size:13px;font-weight:600;letter-spacing:.1em;color:rgba(245,241,232,.55);margin-bottom:16px}
.footer-list li{margin-bottom:10px;font-size:14px;line-height:1.7}
.footer-list a,.footer-list span{color:rgba(245,241,232,.82);transition:color .18s ease}
.footer-list a:hover{color:#fff;text-decoration:underline;text-underline-offset:4px}
.footer-band{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:20px;
  padding:22px 0;border-top:1px solid rgba(245,241,232,.16);border-bottom:1px solid rgba(245,241,232,.16);
}
.footer-band p{margin:0;font-size:14px;color:rgba(245,241,232,.78)}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;padding-top:24px;font-size:12px;color:rgba(245,241,232,.6)}
.footer-bottom nav{display:flex;flex-wrap:wrap;gap:18px}
.footer-bottom nav a{color:rgba(245,241,232,.72);transition:color .18s ease}
.footer-bottom nav a:hover{color:#fff}

/* ---------- responsive ---------- */
@media (max-width:1099px){
  .header-inner{gap:20px}
  .nav{gap:18px}
  .nav-link{font-size:14px}
  .hero-grid{grid-template-columns:6fr 5fr;gap:32px}
  .contact-grid{grid-template-columns:1fr;gap:32px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
}
@media (max-width:1023px){
  .nav{
    position:fixed;inset:var(--header-h) 0 auto 0;
    display:none;flex-direction:column;align-items:stretch;gap:0;
    padding:12px 24px 28px;background:var(--canvas);border-bottom:1px solid var(--line);
    box-shadow:0 24px 40px -32px rgba(15,43,38,.7);max-height:calc(100vh - var(--header-h));overflow:auto;
  }
  .nav.is-open{display:flex}
  .nav-link{font-size:18px;line-height:56px;border-bottom:1px solid var(--line);color:var(--ink)}
  .nav-link::after{display:none}
  .nav-link.is-active{color:var(--accent)}
  .nav-toggle{display:flex}
  .hero-grid{grid-template-columns:1fr;gap:32px}
  .hero{padding-bottom:48px}
  .hero-figure{order:-1}
  .hero-figure img{aspect-ratio:16/9}
  .band-inner{grid-template-columns:1fr;gap:24px;padding:32px}
  .section{padding:56px 0}
  .section-tight{padding:44px 0}
}
@media (max-width:767px){
  .container{padding:0 20px}
  .header-inner{height:64px}
  :root{--header-h:64px}
  h1{font-size:30px}
  .hero{padding-top:24px}
  .hero-actions .btn{flex:1 1 auto}
  .faq-q{font-size:16px;gap:16px}
  .form-card{padding:24px 20px}
  .form-grid{grid-template-columns:1fr;gap:0}
  .band-inner{padding:24px 20px}
  .band-actions{flex-direction:column}
  .band-actions .btn{width:100%}
  .footer-grid{grid-template-columns:1fr;gap:28px;padding-bottom:32px}
  .footer-band{flex-direction:column;align-items:flex-start}
  .footer-band .btn{width:100%}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .anchor-bar{top:64px}
}
@media (max-width:400px){
  .hero-actions{flex-direction:column}
  .hero-actions .btn{width:100%}
  .btn{padding:0 22px}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
}