/* roulang page: index */
:root{
  --paper:#F7F5F0;
  --paper-2:#EFEBE3;
  --ink-900:#14161A;
  --ink-700:#2B2F36;
  --ink-500:#5A6068;
  --ink-300:#9AA0A6;
  --line:#DCD6CA;
  --accent:#C1531F;
  --accent-deep:#8E3A15;
  --jade:#1E4D43;
  --jade-2:#2F6B5C;
  --ok:#2F6B4A;
  --warn:#B07A20;
  --error:#A8332A;
  --radius-card:4px;
  --radius-btn:2px;
  --radius-input:4px;
  --shadow-1:0 1px 2px rgba(20,22,26,.04);
  --shadow-2:0 12px 32px -12px rgba(20,22,26,.18);
  --font-cn:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:ui-monospace,"JetBrains Mono",Menlo,monospace;
  --container:1200px;
  --pad-y:112px;
  --ease:cubic-bezier(.2,.7,.3,1);
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink-900);
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.85;
  letter-spacing:0;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0;}
ul,ol{padding:0;list-style:none;}
img{max-width:100%;display:block;border-radius:var(--radius-card);}
a{color:var(--ink-900);text-decoration:none;transition:color .18s ease;}
button{font-family:inherit;cursor:pointer;}
input{font-family:inherit;}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;}
.container{max-width:var(--container);margin:0 auto;padding:0 24px;width:100%;}
.mono{font-family:var(--font-mono);}
.section{padding:var(--pad-y) 0;}
.section--tight{padding:72px 0;}
.eyebrow{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--ink-500);
}
.section-head{
  display:flex;
  justify-content:space-between;
  align-items:flex-end;
  gap:32px;
  border-bottom:1px solid var(--line);
  padding-bottom:24px;
  margin-bottom:40px;
}
.section-head h2{
  font-size:clamp(26px,3.2vw,40px);
  line-height:1.25;
  letter-spacing:-.02em;
  font-weight:800;
}
.section-head p{
  font-size:15px;
  color:var(--ink-500);
  max-width:34em;
  text-align:right;
}
h3{font-size:clamp(20px,2.2vw,26px);line-height:1.35;letter-spacing:-.02em;font-weight:700;}
p{max-width:34em;}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:transparent;
  transition:background .25s ease, box-shadow .25s ease, border-color .25s ease;
  border-bottom:1px solid transparent;
}
.site-header.is-scrolled{
  background:rgba(247,245,240,.92);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.nav-wrap{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  height:76px;
  gap:24px;
}
.nav-group{display:flex;align-items:center;gap:28px;}
.nav-group--right{justify-content:flex-end;}
.nav-link{
  position:relative;
  font-size:14px;
  color:var(--ink-700);
  padding:6px 0;
  white-space:nowrap;
}
.nav-link::after{
  content:"";
  position:absolute;left:0;bottom:0;
  width:100%;height:1px;background:var(--ink-900);
  transform:scaleX(0);transform-origin:left;
  transition:transform .25s var(--ease);
}
.nav-link:hover{color:var(--ink-900);}
.nav-link:hover::after{transform:scaleX(1);}
.nav-link.is-active{color:var(--ink-900);font-weight:600;}
.nav-link.is-active::before{
  content:"";
  position:absolute;left:50%;bottom:-10px;
  width:24px;height:2px;background:var(--accent);
  transform:translateX(-50%);
}
.logo{
  display:inline-flex;align-items:center;gap:10px;
  justify-self:center;white-space:nowrap;
}
.logo-mark{position:relative;width:16px;height:16px;flex:none;}
.logo-mark i{
  position:absolute;top:0;left:0;width:12px;height:12px;
  background:var(--accent);display:block;
}
.logo-mark b{
  position:absolute;bottom:0;right:0;width:12px;height:12px;
  border:1px solid var(--ink-900);display:block;
}
.logo-text{font-size:19px;font-weight:800;letter-spacing:-.02em;}
.logo-text span{font-weight:400;color:var(--ink-700);}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:48px;padding:14px 26px;
  font-size:14px;font-weight:500;line-height:1.2;
  border-radius:var(--radius-btn);
  border:1px solid transparent;
  transition:background .18s ease,color .18s ease,border-color .18s ease,transform .18s ease;
}
.btn .arw{display:inline-block;transition:transform .18s ease;}
.btn:hover .arw{transform:translateX(4px);}
.btn-primary{background:var(--accent);color:var(--paper);}
.btn-primary:hover{background:var(--accent-deep);}
.btn-primary:active{transform:translateY(1px);}
.btn-ghost{background:transparent;color:var(--ink-900);border:1px solid var(--ink-900);}
.btn-ghost:hover{background:var(--ink-900);color:var(--paper);}
.btn-outline-accent{
  background:transparent;color:var(--ink-900);
  border:1px solid var(--ink-900);
  min-height:40px;padding:9px 18px;font-size:13px;
}
.btn-outline-accent:hover{background:var(--accent);border-color:var(--accent);color:var(--paper);}
.link-arrow{
  display:inline-flex;align-items:center;gap:6px;
  font-size:14px;color:var(--ink-900);position:relative;
}
.link-arrow::after{
  content:"";position:absolute;left:0;bottom:-3px;width:100%;height:1px;
  background:currentColor;transform:scaleX(0);transform-origin:left;
  transition:transform .25s var(--ease);
}
.link-arrow:hover::after{transform:scaleX(1);}
.link-arrow .arw{transition:transform .18s ease;}
.link-arrow:hover .arw{transform:translateX(4px);}
.nav-toggle{
  display:none;width:40px;height:40px;border:0;background:transparent;
  position:relative;justify-self:end;
}
.nav-toggle i{
  position:absolute;left:8px;width:24px;height:1.5px;background:var(--ink-900);
  transition:transform .25s var(--ease),opacity .2s ease;
}
.nav-toggle i:nth-child(1){top:14px;}
.nav-toggle i:nth-child(2){top:20px;}
.nav-toggle i:nth-child(3){top:26px;}
.nav-toggle[aria-expanded="true"] i:nth-child(1){transform:translateY(6px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] i:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] i:nth-child(3){transform:translateY(-6px) rotate(-45deg);}
.drawer{
  position:fixed;inset:0;z-index:55;
  background:var(--paper);
  padding:96px 24px 24px;
  display:flex;flex-direction:column;
  transform:translateY(-100%);
  transition:transform .32s var(--ease);
  visibility:hidden;
}
.drawer.is-open{transform:translateY(0);visibility:visible;}
.drawer a.drawer-link{
  display:flex;align-items:center;justify-content:space-between;
  font-size:18px;padding:16px 0;border-bottom:1px solid var(--line);
  color:var(--ink-900);
}
.drawer .btn{width:100%;margin-top:24px;}

/* ---------- hero ---------- */
.hero{
  position:relative;
  overflow:hidden;
  border-bottom:1px solid var(--line);
  background:var(--paper);
}
.hero::before{
  content:"";
  position:absolute;inset:0;
  background-image:url("/assets/images/backpic/back-1.png");
  background-size:cover;background-position:center;
  opacity:.08;pointer-events:none;
}
.hero::after{
  content:"";
  position:absolute;inset:0;
  background-image:repeating-linear-gradient(to right,rgba(20,22,26,.04) 0 1px,transparent 1px 120px);
  pointer-events:none;
}
.hero-inner{
  position:relative;z-index:2;
  display:grid;grid-template-columns:7fr 5fr;gap:56px;align-items:center;
  min-height:78vh;max-height:760px;padding:72px 0 64px;
}
.hero-label{margin-bottom:24px;display:flex;align-items:center;gap:8px;}
.hero h1{
  font-size:clamp(34px,5vw,56px);
  line-height:1.2;
  letter-spacing:-.02em;
  font-weight:800;
  max-width:14em;
  margin-bottom:24px;
}
.hero-sub{
  font-size:18px;color:var(--ink-500);line-height:1.75;
  max-width:34em;margin-bottom:36px;
}
.hero-actions{display:flex;align-items:center;gap:24px;flex-wrap:wrap;margin-bottom:48px;}
.hero-metrics{
  display:flex;align-items:stretch;gap:0;flex-wrap:wrap;
  border-top:1px solid var(--line);padding-top:24px;max-width:560px;
}
.metric{padding:0 28px;}
.metric:first-child{padding-left:0;}
.metric + .metric{border-left:1px solid var(--line);}
.metric-num{font-family:var(--font-mono);font-size:26px;line-height:1.2;color:var(--ink-900);}
.metric-cap{font-size:13px;color:var(--ink-500);line-height:1.6;margin-top:4px;}
.hero-visual{position:relative;}
.hero-visual .frame{
  position:absolute;inset:0;transform:translate(12px,12px);
  border:1px solid var(--line);border-radius:var(--radius-card);
  pointer-events:none;
}
.hero-figure{position:relative;border-radius:var(--radius-card);overflow:hidden;aspect-ratio:16/10;background:var(--paper-2);}
.hero-figure img{width:100%;height:100%;object-fit:cover;}
.hero-chip{
  position:absolute;left:16px;bottom:16px;z-index:3;
  background:var(--paper);border:1px solid var(--line);
  padding:12px 16px;border-radius:var(--radius-card);
  box-shadow:var(--shadow-1);
}
.hero-chip .chip-num{font-family:var(--font-mono);font-size:15px;color:var(--ink-900);}
.hero-chip .chip-cap{font-size:12px;color:var(--ink-500);line-height:1.5;}

/* ---------- capability ---------- */
.cap-grid{display:grid;grid-template-columns:7fr 5fr;gap:24px;}
.cap-row2{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:24px;}
.card{
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  padding:32px;
  box-shadow:var(--shadow-1);
  transition:border-color .3s ease,box-shadow .3s ease,transform .3s ease;
}
.card:hover{border-color:var(--ink-300);box-shadow:var(--shadow-2);}
.card-num{font-family:var(--font-mono);font-size:12px;color:var(--accent);letter-spacing:.12em;margin-bottom:16px;display:block;}
.card h3{margin-bottom:12px;}
.card p{font-size:15px;color:var(--ink-500);line-height:1.8;margin-bottom:20px;}
.card-media{
  position:relative;overflow:hidden;border-radius:var(--radius-card);
  aspect-ratio:16/10;background:var(--paper-2);margin-bottom:24px;
}
.card-media img{width:100%;height:100%;object-fit:cover;transition:transform .6s ease-out;}
.card:hover .card-media img{transform:scale(1.03);}
.card--feature{display:flex;flex-direction:column;}
.card--row{display:grid;grid-template-columns:1fr 160px;gap:24px;align-items:center;}
.card--row .card-media{margin-bottom:0;aspect-ratio:4/3;}
.card--row h3{font-size:22px;}

/* ---------- scenarios ---------- */
.scene{border-top:1px solid var(--line);padding:56px 0;display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;}
.scene:first-of-type{border-top:1px solid var(--line);}
.scene:nth-child(even) .scene-media{order:-1;}
.scene-num{font-family:var(--font-mono);font-size:13px;color:var(--accent);letter-spacing:.14em;margin-bottom:12px;display:block;}
.scene h3{margin-bottom:16px;}
.scene p{font-size:15px;color:var(--ink-500);line-height:1.85;margin-bottom:14px;}
.scene ul{margin-top:20px;display:flex;flex-direction:column;gap:10px;}
.scene li{position:relative;padding-left:16px;font-size:14px;color:var(--ink-700);}
.scene li::before{
  content:"";position:absolute;left:0;top:.7em;
  width:4px;height:4px;background:var(--accent);
}
.scene-media{
  position:relative;overflow:hidden;border-radius:var(--radius-card);
  aspect-ratio:4/3;background:var(--paper-2);
}
.scene-media img{width:100%;height:100%;object-fit:cover;}

/* ---------- cases ---------- */
.cases{
  background:var(--jade);color:var(--paper);
  position:relative;overflow:hidden;
}
.cases::before{
  content:"";position:absolute;inset:0;
  background-image:url("/assets/images/backpic/back-2.png");
  background-size:cover;background-position:center;
  opacity:.07;
}
.cases .container{position:relative;z-index:2;}
.cases-grid{display:grid;grid-template-columns:4fr 8fr;gap:56px;}
.cases h2{
  font-size:clamp(26px,3.2vw,40px);line-height:1.25;letter-spacing:-.02em;
  font-weight:800;margin-bottom:20px;color:var(--paper);
}
.cases-intro p{font-size:15px;line-height:1.85;color:rgba(255,255,255,.72);margin-bottom:24px;}
.cases .link-arrow{color:var(--paper);}
.case-cards{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.case-card{
  border:1px solid rgba(255,255,255,.12);
  border-radius:var(--radius-card);
  padding:28px 24px;
  background:rgba(255,255,255,.03);
  transition:background .3s ease;
}
.case-card:hover{background:rgba(255,255,255,.06);}
.case-tag{
  font-size:12px;letter-spacing:.1em;color:rgba(255,255,255,.55);
  font-family:var(--font-mono);margin-bottom:14px;display:block;
}
.case-card p{font-size:17px;line-height:1.6;color:var(--paper);margin-bottom:20px;max-width:none;}
.case-metric{font-family:var(--font-mono);font-size:32px;line-height:1.1;color:var(--paper);}
.case-metric-cap{font-size:12px;color:rgba(255,255,255,.55);margin-top:6px;}
.cases-foot{
  margin-top:40px;padding-top:24px;
  border-top:1px solid rgba(255,255,255,.12);
  display:flex;flex-wrap:wrap;gap:40px;
  font-size:13px;color:rgba(255,255,255,.5);
}

/* ---------- pricing ---------- */
.plan-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;align-items:stretch;}
.plan{
  position:relative;
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  padding:32px;
  display:flex;flex-direction:column;
  transition:border-color .3s ease,box-shadow .3s ease;
}
.plan:hover{border-color:var(--ink-300);box-shadow:var(--shadow-2);}
.plan--feature{border-width:1.5px;border-color:var(--ink-900);}
.plan--feature::before{
  content:"";position:absolute;top:0;left:0;right:0;height:2px;background:var(--accent);
}
.plan-badge{
  position:absolute;top:16px;right:16px;
  background:var(--accent);color:var(--paper);
  font-size:12px;padding:3px 8px;border-radius:2px;letter-spacing:.08em;
}
.plan-name{font-size:14px;letter-spacing:.14em;color:var(--ink-500);margin-bottom:16px;}
.plan-price{font-family:var(--font-mono);font-size:44px;line-height:1.1;letter-spacing:-.02em;}
.plan-price small{font-family:var(--font-cn);font-size:14px;color:var(--ink-500);margin-left:6px;}
.plan-desc{font-size:14px;color:var(--ink-500);line-height:1.75;margin:14px 0 24px;max-width:none;}
.plan-list{border-top:1px solid var(--line);padding-top:20px;display:flex;flex-direction:column;gap:12px;margin-bottom:28px;}
.plan-list li{position:relative;padding-left:26px;font-size:14px;color:var(--ink-700);line-height:1.6;}
.plan-list li::before{
  content:"";position:absolute;left:0;top:2px;width:16px;height:16px;
  border:1px solid var(--line);border-radius:2px;
}
.plan-list li::after{
  content:"";position:absolute;left:5px;top:7px;width:6px;height:3px;
  border-left:1.5px solid var(--accent);border-bottom:1.5px solid var(--accent);
  transform:rotate(-45deg);
}
.plan .btn{margin-top:auto;width:100%;}
.plan-note{margin-top:24px;font-size:13px;color:var(--ink-300);}

/* ---------- news ---------- */
.news-grid{display:grid;grid-template-columns:6fr 6fr;gap:40px;}
.news-main a{display:block;border-radius:var(--radius-card);}
.news-media{
  position:relative;overflow:hidden;border-radius:var(--radius-card);
  aspect-ratio:16/10;background:var(--paper-2);margin-bottom:20px;
}
.news-media img{width:100%;height:100%;object-fit:cover;transition:transform .6s ease-out;}
.news-main a:hover .news-media img{transform:scale(1.03);}
.news-badge{
  position:absolute;left:16px;top:16px;
  background:var(--paper);border-radius:2px;
  font-size:12px;color:var(--ink-700);padding:4px 10px;border:1px solid var(--line);
}
.news-main h3{font-size:24px;margin-bottom:12px;transition:color .2s ease;}
.news-main a:hover h3{color:var(--accent);}
.news-main p{font-size:14px;color:var(--ink-500);line-height:1.8;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;margin-bottom:16px;}
.news-time{font-family:var(--font-mono);font-size:13px;color:var(--ink-300);}
.news-side{display:flex;flex-direction:column;}
.news-row{
  display:block;position:relative;border-bottom:1px solid var(--line);
  padding:20px 0 20px 0;transition:padding-left .2s ease;
}
.news-row:first-child{padding-top:0;}
.news-row::before{
  content:"";position:absolute;left:0;top:20px;bottom:20px;width:2px;
  background:var(--accent);transform:scaleY(0);transform-origin:top;
  transition:transform .25s var(--ease);
}
.news-row:hover::before{transform:scaleY(1);}
.news-row:hover{padding-left:14px;}
.news-row h4{font-size:17px;line-height:1.55;font-weight:600;margin-bottom:6px;transition:color .2s ease;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.news-row:hover h4{color:var(--accent);}
.news-row p{font-size:13px;color:var(--ink-500);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:none;margin-bottom:8px;}
.news-meta{font-size:12px;color:var(--ink-300);font-family:var(--font-mono);}
.news-meta em{font-style:normal;color:var(--ink-500);}
.empty-state{
  border:1px dashed var(--line);border-radius:var(--radius-card);
  padding:56px 24px;text-align:center;
}
.empty-state svg{width:32px;height:32px;stroke:var(--ink-300);fill:none;stroke-width:1.5;margin:0 auto 16px;}
.empty-state strong{display:block;font-size:15px;font-weight:500;margin-bottom:6px;}
.empty-state span{font-size:13px;color:var(--ink-300);}

/* ---------- faq ---------- */
.faq-grid{display:grid;grid-template-columns:4fr 8fr;gap:56px;}
.faq-side{position:sticky;top:108px;align-self:start;}
.faq-side h2{font-size:clamp(26px,3.2vw,40px);line-height:1.25;letter-spacing:-.02em;font-weight:800;margin-bottom:16px;}
.faq-side p{font-size:15px;color:var(--ink-500);margin-bottom:24px;}
.faq-item{border-bottom:1px solid var(--line);}
.faq-item:first-child{border-top:1px solid var(--line);}
.faq-item summary{
  list-style:none;cursor:pointer;
  display:flex;align-items:center;justify-content:space-between;gap:24px;
  padding:20px 0;font-size:17px;font-weight:500;color:var(--ink-900);
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-icon{position:relative;width:20px;height:20px;flex:none;}
.faq-icon::before,.faq-icon::after{
  content:"";position:absolute;background:var(--ink-500);transition:transform .25s var(--ease),opacity .25s ease;
}
.faq-icon::before{left:0;top:9.25px;width:20px;height:1.5px;}
.faq-icon::after{top:0;left:9.25px;width:1.5px;height:20px;}
.faq-item[open] .faq-icon::after{transform:rotate(90deg);opacity:0;}
.faq-answer{padding-bottom:20px;}
.faq-answer p{font-size:15px;color:var(--ink-500);line-height:1.85;}

/* ---------- cta ---------- */
.cta{
  position:relative;overflow:hidden;
  background:var(--jade);color:var(--paper);text-align:center;
  padding:96px 0;
}
.cta::before{
  content:"BEAT365";
  position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  font-family:var(--font-mono);font-size:clamp(120px,22vw,280px);
  color:rgba(255,255,255,.04);letter-spacing:.06em;white-space:nowrap;
  pointer-events:none;line-height:1;
}
.cta .container{position:relative;z-index:2;}
.cta h2{font-size:clamp(26px,3.4vw,40px);line-height:1.25;letter-spacing:-.02em;font-weight:800;margin-bottom:16px;}
.cta p{font-size:15px;color:rgba(255,255,255,.72);margin:0 auto 32px;max-width:36em;}
.cta-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;}
.cta .btn-primary{background:var(--paper);color:var(--ink-900);}
.cta .btn-primary:hover{background:#fff;}
.cta .btn-ghost{border-color:rgba(255,255,255,.7);color:var(--paper);}
.cta .btn-ghost:hover{background:var(--paper);color:var(--ink-900);border-color:var(--paper);}

/* ---------- footer ---------- */
.site-footer{background:var(--ink-900);color:rgba(255,255,255,.72);padding-top:72px;}
.footer-grid{
  display:grid;grid-template-columns:5fr 2fr 2fr 2fr;gap:40px;
  padding-bottom:56px;border-bottom:1px solid rgba(255,255,255,.12);
}
.footer-brand .logo-text{color:var(--paper);}
.footer-brand .logo-text span{color:rgba(255,255,255,.6);}
.footer-brand p{font-size:14px;line-height:1.85;margin:20px 0 24px;color:rgba(255,255,255,.6);max-width:26em;}
.footer-contact{display:flex;flex-direction:column;gap:12px;font-size:14px;}
.footer-contact li{display:flex;align-items:center;gap:10px;color:rgba(255,255,255,.72);}
.footer-contact svg{width:16px;height:16px;stroke:rgba(255,255,255,.5);fill:none;stroke-width:1.5;flex:none;}
.footer-col h4{font-size:13px;letter-spacing:.14em;color:rgba(255,255,255,.5);font-weight:500;margin-bottom:18px;}
.footer-col ul{display:flex;flex-direction:column;gap:12px;}
.footer-col a{font-size:14px;color:rgba(255,255,255,.72);position:relative;display:inline-block;}
.footer-col a::after{
  content:"";position:absolute;left:0;bottom:-2px;width:100%;height:1px;background:var(--paper);
  transform:scaleX(0);transform-origin:left;transition:transform .25s var(--ease);
}
.footer-col a:hover{color:var(--paper);}
.footer-col a:hover::after{transform:scaleX(1);}
.footer-acc-trigger{display:none;}
.footer-bottom{
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  padding:20px 0;border-top:1px solid rgba(255,255,255,.12);
  font-size:13px;color:rgba(255,255,255,.5);
}
.footer-bottom a{color:rgba(255,255,255,.5);}
.footer-bottom a:hover{color:var(--paper);}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(16px);}
.reveal.is-in{opacity:1;transform:none;transition:opacity .42s var(--ease),transform .42s var(--ease);}

/* ---------- responsive ---------- */
@media (max-width:1199px){
  :root{--pad-y:88px;}
  .card{padding:28px;}
  .hero-inner{gap:40px;}
}
@media (max-width:991px){
  .nav-wrap{grid-template-columns:auto 1fr auto;height:60px;}
  .nav-group{display:none;}
  .logo{justify-self:start;}
  .nav-toggle{display:block;}
  .hero-inner{grid-template-columns:1fr;gap:40px;min-height:0;max-height:none;padding:56px 0 56px;}
  .hero-visual{order:2;}
  .cap-grid{grid-template-columns:1fr;}
  .cap-row2{grid-template-columns:1fr;}
  .scene{grid-template-columns:1fr;gap:32px;padding:40px 0;}
  .scene:nth-child(even) .scene-media{order:0;}
  .cases-grid{grid-template-columns:1fr;gap:40px;}
  .plan-grid{grid-template-columns:1fr;}
  .plan--feature{order:-1;}
  .news-grid{grid-template-columns:1fr;gap:32px;}
  .faq-grid{grid-template-columns:1fr;gap:32px;}
  .faq-side{position:static;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .footer-brand{grid-column:1 / -1;}
}
@media (max-width:767px){
  :root{--pad-y:64px;}
  .container{padding:0 20px;}
  body{font-size:15px;line-height:1.8;}
  .section-head{flex-direction:column;align-items:flex-start;gap:12px;}
  .section-head p{text-align:left;}
  .card{padding:24px;}
  .card--row{grid-template-columns:1fr;}
  .card--row .card-media{aspect-ratio:16/10;}
  .hero-sub{font-size:16px;}
  .btn{min-height:48px;}
  .hero-actions .btn-primary{width:100%;}
  .case-cards{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr;gap:0;}
  .footer-col{border-top:1px solid rgba(255,255,255,.12);}
  .footer-col h4{
    display:flex;align-items:center;justify-content:space-between;
    margin:0;padding:18px 0;font-size:13px;cursor:pointer;
  }
  .footer-col h4::after{content:"+";font-size:16px;color:rgba(255,255,255,.5);}
  .footer-col.is-open h4::after{content:"−";}
  .footer-col ul{display:none;padding-bottom:18px;}
  .footer-col.is-open ul{display:flex;}
  .footer-brand{padding-bottom:24px;}
  .footer-bottom{flex-direction:column;gap:8px;}
}
@media (max-width:575px){
  .hero-inner{padding:40px 0;min-height:70vh;}
  .hero-metrics{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
  .metric{padding:0;}
  .metric + .metric{border-left:0;}
  .cta{padding:72px 0;}
  .news-main h3{font-size:20px;}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .reveal{opacity:1;transform:none;}
}

/* roulang page: article */
:root{
  --paper:#F7F5F0;
  --paper-2:#EFEBE3;
  --ink-900:#14161A;
  --ink-700:#2B2F36;
  --ink-500:#5A6068;
  --ink-300:#9AA0A6;
  --line:#DCD6CA;
  --accent:#C1531F;
  --accent-deep:#8E3A15;
  --jade:#1E4D43;
  --jade-2:#2F6B5C;
  --ok:#2F6B4A;
  --warn:#B07A20;
  --error:#A8332A;
  --radius-card:4px;
  --radius-btn:2px;
  --shadow-rest:0 1px 2px rgba(20,22,26,.04);
  --shadow-hover:0 12px 32px -12px rgba(20,22,26,.18);
  --font-sans:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:ui-monospace,"JetBrains Mono",Menlo,monospace;
  --container:1200px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink-900);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.85;
  letter-spacing:0;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%;height:auto}
svg{display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p,figure,blockquote{margin:0}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
::selection{background:rgba(193,83,31,.16)}
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:transparent;
  transition:background .25s ease,box-shadow .25s ease;
}
.site-header.is-stuck{
  background:rgba(247,245,240,.92);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  box-shadow:0 1px 0 var(--line);
}
.header-inner{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:24px;
  height:76px;
}
.nav-group{display:flex;align-items:center;gap:26px}
.nav-group--left{justify-content:flex-start}
.nav-group--right{justify-content:flex-end}
.nav-link{
  position:relative;
  font-size:14px;
  color:var(--ink-700);
  padding:6px 0;
  transition:color .18s ease;
  white-space:nowrap;
}
.nav-link::after{
  content:"";position:absolute;left:0;bottom:0;width:100%;height:1px;
  background:currentColor;transform:scaleX(0);transform-origin:left;
  transition:transform .25s ease;
}
.nav-link:hover{color:var(--ink-900)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link.is-active{color:var(--ink-900)}
.nav-link.is-active::before{
  content:"";position:absolute;left:50%;bottom:-7px;transform:translateX(-50%);
  width:24px;height:2px;background:var(--accent);
}
.logo{display:inline-flex;align-items:center;gap:10px;justify-self:center}
.logo-mark{position:relative;width:16px;height:16px;display:inline-block;flex:none}
.logo-mark i{position:absolute;left:0;top:0;width:12px;height:12px;background:var(--accent);display:block}
.logo-mark b{position:absolute;left:4px;top:4px;width:12px;height:12px;border:1px solid var(--ink-900);display:block}
.logo-text{font-weight:800;font-size:19px;letter-spacing:-.02em;color:var(--ink-900);line-height:1}
.logo-text span{font-weight:400;margin-left:4px;color:var(--ink-700)}
.nav-cta{
  font-size:14px;
  padding:10px 18px;
  border:1px solid var(--ink-900);
  border-radius:var(--radius-btn);
  color:var(--ink-900);
  transition:background .18s ease,color .18s ease,border-color .18s ease;
  white-space:nowrap;
}
.nav-cta:hover{background:var(--accent);border-color:var(--accent);color:var(--paper)}
.nav-toggle{
  display:none;
  width:44px;height:44px;
  align-items:center;justify-content:center;
  border:1px solid var(--line);
  border-radius:var(--radius-btn);
  justify-self:end;
  grid-column:3;
}
.nav-toggle span{position:relative;display:block;width:20px;height:1.5px;background:var(--ink-900);transition:background .2s ease}
.nav-toggle span::before,
.nav-toggle span::after{
  content:"";position:absolute;left:0;width:20px;height:1.5px;background:var(--ink-900);
  transition:transform .22s ease,top .22s ease;
}
.nav-toggle span::before{top:-6px}
.nav-toggle span::after{top:6px}
.site-header.is-open .nav-toggle span{background:transparent}
.site-header.is-open .nav-toggle span::before{top:0;transform:rotate(45deg)}
.site-header.is-open .nav-toggle span::after{top:0;transform:rotate(-45deg)}

/* mobile drawer */
.mobile-drawer{
  position:fixed;
  inset:0;
  z-index:55;
  background:var(--paper);
  padding:96px 20px 32px;
  display:none;
  flex-direction:column;
  overflow-y:auto;
}
.mobile-drawer.is-open{display:flex}
.drawer-link{
  display:block;
  font-size:18px;
  line-height:56px;
  color:var(--ink-900);
  border-bottom:1px solid var(--line);
}
.drawer-link:first-child{border-top:1px solid var(--line)}
.drawer-cta{margin-top:28px;width:100%;justify-content:center}
body.is-locked{overflow:hidden}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-size:14px;font-weight:500;
  padding:14px 26px;
  min-height:48px;
  border-radius:var(--radius-btn);
  transition:background .18s ease,color .18s ease,border-color .18s ease,transform .12s ease;
}
.btn:active{transform:translateY(1px)}
.btn--solid{background:var(--accent);color:var(--paper)}
.btn--solid:hover{background:var(--accent-deep)}
.btn--outline{border:1px solid var(--ink-900);color:var(--ink-900)}
.btn--outline:hover{background:var(--ink-900);color:var(--paper)}
.btn--paper{background:var(--paper);color:var(--ink-900)}
.btn--paper:hover{background:#fff}
.btn--ghost{border:1px solid rgba(255,255,255,.7);color:var(--paper)}
.btn--ghost:hover{background:rgba(255,255,255,.12)}
.btn:disabled,.btn.is-disabled{opacity:.45;cursor:not-allowed}
.btn:disabled:hover,.btn.is-disabled:hover{background:var(--accent);transform:none}

/* ---------- article layout ---------- */
.article-shell{padding:40px 0 0}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--ink-300)}
.breadcrumb li{display:flex;align-items:center;gap:8px;min-width:0}
.breadcrumb li+li::before{content:"/";color:var(--line)}
.breadcrumb a{color:var(--ink-300);transition:color .18s ease}
.breadcrumb a:hover{color:var(--ink-900)}
.breadcrumb .current{color:var(--ink-500);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:46vw}

.article-head{max-width:760px;margin:0 auto;padding:28px 0 36px}
.badge{
  display:inline-block;
  font-size:12px;letter-spacing:.14em;
  color:var(--accent);
  border:1px solid var(--accent);
  border-radius:2px;
  padding:3px 10px;
  line-height:1.4;
}
.article-head h1{
  font-size:clamp(26px,3.4vw,40px);
  line-height:1.35;
  font-weight:800;
  letter-spacing:-.02em;
  margin-top:18px;
  color:var(--ink-900);
}
.article-meta{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 18px;
  margin-top:22px;
  font-size:13px;
  color:var(--ink-500);
  font-family:var(--font-mono);
}
.article-meta .dot{width:1px;height:12px;background:var(--line)}
.head-rule{max-width:760px;margin:0 auto;height:1px;background:var(--line)}

.article-cover{
  max-width:760px;
  margin:40px auto 0;
  aspect-ratio:16/10;
  border-radius:var(--radius-card);
  overflow:hidden;
  background:var(--paper-2);
  border:1px solid var(--line);
}
.article-cover img{width:100%;height:100%;object-fit:cover}

.article-body{
  max-width:760px;
  margin:0 auto;
  padding:44px 0 8px;
  font-size:17px;
  line-height:1.9;
  color:var(--ink-700);
}
.article-body p{margin:0 0 1.2em;text-indent:0}
.article-body h2{
  font-size:24px;line-height:1.4;font-weight:700;
  color:var(--ink-900);
  margin:48px 0 16px;
  padding-left:16px;
  border-left:4px solid var(--accent);
  letter-spacing:-.01em;
}
.article-body h3{
  font-size:20px;line-height:1.5;font-weight:700;
  color:var(--ink-900);
  margin:32px 0 12px;
}
.article-body h4{font-size:17px;font-weight:700;color:var(--ink-900);margin:24px 0 10px}
.article-body ul{margin:0 0 1.2em;padding:0}
.article-body ul li{position:relative;padding-left:18px;margin-bottom:8px}
.article-body ul li::before{
  content:"";position:absolute;left:0;top:.78em;
  width:4px;height:4px;background:var(--accent);
}
.article-body ol{margin:0 0 1.2em;padding-left:22px;list-style:decimal}
.article-body ol li{margin-bottom:8px}
.article-body blockquote{
  margin:24px 0;
  padding:20px 24px;
  background:var(--paper-2);
  border-left:3px solid var(--accent);
  border-radius:var(--radius-card);
  color:var(--ink-700);
}
.article-body blockquote p:last-child{margin-bottom:0}
.article-body img{
  width:100%;border-radius:var(--radius-card);margin:24px 0;
}
.article-body figure{margin:24px 0}
.article-body figcaption{
  font-size:13px;color:var(--ink-300);text-align:center;margin-top:10px;
}
.article-body table{
  width:100%;border-collapse:collapse;margin:24px 0;font-size:15px;line-height:1.7;
}
.article-body th,
.article-body td{border:1px solid var(--line);padding:12px 16px;text-align:left}
.article-body th{background:var(--paper-2);color:var(--ink-900);font-weight:600}
.article-body a{color:var(--ink-900);border-bottom:1px solid var(--line);transition:border-color .18s ease}
.article-body a:hover{border-bottom-color:var(--accent)}
.article-body code{
  font-family:var(--font-mono);font-size:.92em;
  background:var(--paper-2);border-radius:2px;padding:2px 6px;
}
.article-body hr{border:0;border-top:1px solid var(--line);margin:40px 0}

.article-empty{
  max-width:760px;margin:56px auto 0;
  border:1px dashed var(--line);
  border-radius:var(--radius-card);
  padding:56px 24px;
  text-align:center;
  background:var(--paper-2);
}
.article-empty .empty-title{font-size:15px;color:var(--ink-900);margin-bottom:8px}
.article-empty .empty-desc{font-size:13px;color:var(--ink-300);margin-bottom:24px}

/* ---------- read next ---------- */
.read-next{max-width:760px;margin:56px auto 0;padding-top:32px;border-top:1px solid var(--line)}
.read-next h2{font-size:20px;font-weight:700;color:var(--ink-900);letter-spacing:-.01em;margin-bottom:8px}
.read-next .next-note{font-size:14px;color:var(--ink-500);margin-bottom:20px}
.next-list{border-top:1px solid var(--line)}
.next-list li{border-bottom:1px solid var(--line)}
.next-list a{
  display:flex;align-items:baseline;justify-content:space-between;gap:16px;
  padding:18px 0 18px 0;
  transition:padding-left .22s ease,color .18s ease;
}
.next-list a:hover{padding-left:12px}
.next-list a:hover .next-title{color:var(--accent)}
.next-title{font-size:16px;color:var(--ink-900);transition:color .18s ease}
.next-sub{font-size:13px;color:var(--ink-300);font-family:var(--font-mono);white-space:nowrap}
.back-link{
  display:inline-flex;align-items:center;gap:8px;
  margin-top:28px;font-size:14px;color:var(--ink-900);
  border-bottom:1px solid transparent;
  transition:border-color .2s ease;
}
.back-link:hover{border-bottom-color:var(--ink-900)}
.back-link .arrow{transition:transform .18s ease}
.back-link:hover .arrow{transform:translateX(-4px)}

/* ---------- cta ---------- */
.cta-section{
  position:relative;
  overflow:hidden;
  margin-top:96px;
  padding:96px 0;
  background:var(--jade);
  color:var(--paper);
}
.cta-section::before{
  content:"03";
  position:absolute;right:-24px;bottom:-70px;
  font-family:var(--font-mono);
  font-size:200px;line-height:1;
  color:rgba(255,255,255,.04);
  pointer-events:none;
}
.cta-inner{position:relative;max-width:720px;margin:0 auto;text-align:center}
.cta-inner h2{
  font-size:clamp(26px,3.2vw,36px);
  line-height:1.35;font-weight:800;letter-spacing:-.02em;
}
.cta-inner p{margin-top:16px;font-size:15px;line-height:1.85;color:rgba(255,255,255,.72)}
.cta-actions{display:flex;flex-wrap:wrap;gap:16px;justify-content:center;margin-top:32px}

/* ---------- footer ---------- */
.site-footer{
  background:var(--ink-900);
  color:rgba(255,255,255,.72);
  border-top:1px solid rgba(255,255,255,.12);
  padding:72px 0 0;
}
.footer-grid{
  display:grid;
  grid-template-columns:5fr 2fr 2fr 2fr;
  gap:40px;
  padding-bottom:56px;
}
.footer-brand .logo{justify-self:start;margin-bottom:18px}
.site-footer .logo-text{color:#F7F5F0}
.site-footer .logo-text span{color:rgba(255,255,255,.7)}
.site-footer .logo-mark b{border-color:rgba(255,255,255,.7)}
.footer-brand p{font-size:14px;line-height:1.85;max-width:34em;color:rgba(255,255,255,.72)}
.footer-contact{margin-top:20px;display:grid;gap:10px}
.footer-contact li{display:flex;align-items:center;gap:10px;font-size:14px;color:rgba(255,255,255,.72)}
.footer-contact svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round;flex:none}
.footer-col h4{
  font-size:13px;font-weight:500;letter-spacing:.14em;
  color:rgba(255,255,255,.5);
  margin-bottom:16px;
}
.footer-col ul{display:grid;gap:10px}
.footer-col a{
  font-size:14px;color:rgba(255,255,255,.72);
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .2s ease;
}
.footer-col a:hover{color:#F7F5F0;border-bottom-color:rgba(255,255,255,.7)}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:12px 32px;justify-content:space-between;
  padding:22px 0;
  border-top:1px solid rgba(255,255,255,.12);
  font-size:13px;
  color:rgba(255,255,255,.5);
}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .42s cubic-bezier(.2,.7,.3,1),transform .42s cubic-bezier(.2,.7,.3,1)}
.reveal.is-in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1199px){
  .header-inner{height:72px;gap:18px}
  .nav-group{gap:20px}
  .footer-grid{grid-template-columns:4fr 2fr 2fr 2fr;gap:32px}
}
@media (max-width:991px){
  .header-inner{grid-template-columns:44px 1fr 44px;height:60px;gap:12px}
  .nav-group{display:none}
  .nav-toggle{display:flex}
  .logo{grid-column:2}
  .logo-text{font-size:17px}
  .article-shell{padding-top:28px}
  .article-head{padding:22px 0 28px}
  .article-body{font-size:16px;line-height:1.88}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .footer-brand{grid-column:1 / -1}
  .cta-section{margin-top:72px;padding:72px 0}
  .cta-section::before{font-size:150px}
}
@media (max-width:767px){
  .container{padding:0 20px}
  .article-head h1{font-size:26px;line-height:1.4}
  .article-body{font-size:15px;line-height:1.87;padding-top:32px}
  .article-body h2{font-size:20px;margin-top:36px}
  .article-body h3{font-size:18px}
  .article-cover{margin-top:28px;border-radius:0;border-left:0;border-right:0}
  .article-body img{border-radius:0;margin-left:-20px;margin-right:-20px;width:calc(100% + 40px);max-width:none}
  .article-body blockquote{padding:16px 18px}
  .article-body table{font-size:14px}
  .article-body th,.article-body td{padding:10px 12px}
  .breadcrumb .current{max-width:56vw}
  .read-next{margin-top:44px}
  .footer-grid{grid-template-columns:1fr;gap:0;padding-bottom:24px}
  .footer-brand{padding-bottom:28px}
  .footer-brand p{max-width:none}
  .footer-col{border-top:1px solid rgba(255,255,255,.12)}
  .footer-col h4{
    display:flex;align-items:center;justify-content:space-between;
    margin:0;padding:18px 0;cursor:pointer;color:rgba(255,255,255,.72);
    letter-spacing:.06em;font-size:14px;
  }
  .footer-col h4::after{content:"+";font-family:var(--font-mono);color:rgba(255,255,255,.5);font-size:16px}
  .footer-col.is-open h4::after{content:"−"}
  .footer-col ul{display:none;padding-bottom:18px}
  .footer-col.is-open ul{display:grid}
  .footer-bottom{flex-direction:column;gap:8px;padding:20px 0 28px}
  .cta-actions .btn{width:100%}
}
@media (max-width:575px){
  .article-meta{font-size:12px;gap:8px 12px}
  .article-meta .dot{display:none}
  .cta-section{padding:64px 0}
  .cta-section::before{font-size:110px;bottom:-40px}
  .next-list a{flex-direction:column;gap:4px}
  .next-sub{white-space:normal}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  *{transition-duration:.01ms !important;animation-duration:.01ms !important}
}

/* roulang page: category1 */
:root{
  --paper:#F7F5F0;
  --paper-2:#EFEBE3;
  --ink-900:#14161A;
  --ink-700:#2B2F36;
  --ink-500:#5A6068;
  --ink-300:#9AA0A6;
  --line:#DCD6CA;
  --accent:#C1531F;
  --accent-deep:#8E3A15;
  --jade:#1E4D43;
  --jade-2:#2F6B5C;
  --ok:#2F6B4A;
  --warn:#B07A20;
  --error:#A8332A;
  --r-card:4px;
  --r-btn:2px;
  --shadow:0 1px 2px rgba(20,22,26,.04);
  --shadow-hover:0 12px 32px -12px rgba(20,22,26,.18);
  --container:1200px;
  --mono:ui-monospace,"JetBrains Mono",Menlo,Consolas,monospace;
  --sans:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink-900);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.85;
  letter-spacing:0;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{margin:0;font-weight:700;letter-spacing:-.02em;line-height:1.25}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:var(--ink-900);text-decoration:none}
img{max-width:100%;display:block}
button{font-family:inherit;cursor:pointer}
:focus-visible{outline:2px solid var(--accent);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:50;
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background .25s ease,border-color .25s ease,backdrop-filter .25s ease;
}
.site-header.is-scrolled{
  background:rgba(247,245,240,.92);
  backdrop-filter:blur(8px);
  border-bottom-color:var(--line);
}
.header-inner{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:24px;
  height:76px;
}
.nav-group{display:flex;align-items:center;gap:26px}
.nav-group--right{justify-content:flex-end}
.nav-link{
  position:relative;
  font-size:14px;
  color:var(--ink-700);
  padding:6px 0;
  transition:color .2s ease;
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:-2px;
  height:1px;
  background:var(--ink-900);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .25s ease;
}
.nav-link:hover{color:var(--ink-900)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link.is-active{color:var(--ink-900);font-weight:600}
.nav-link.is-active::after{
  left:50%;right:auto;
  width:24px;height:2px;
  background:var(--accent);
  transform:translateX(-50%);
}
.logo{
  display:inline-flex;
  align-items:center;
  gap:10px;
  justify-self:center;
}
.logo-mark{position:relative;display:inline-block;width:20px;height:20px;flex:none}
.logo-mark i{position:absolute;left:0;top:0;width:12px;height:12px;background:var(--accent);border-radius:1px}
.logo-mark b{position:absolute;left:4px;top:4px;width:16px;height:16px;border:1px solid var(--ink-900);border-radius:1px}
.logo-text{font-size:19px;font-weight:800;letter-spacing:-.02em;line-height:1}
.logo-text span{font-weight:400;color:var(--ink-700)}
.nav-cta{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:14px;
  padding:10px 18px;
  border:1px solid var(--ink-900);
  border-radius:var(--r-btn);
  color:var(--ink-900);
  transition:background .2s ease,color .2s ease,border-color .2s ease;
}
.nav-cta:hover{background:var(--accent);border-color:var(--accent);color:var(--paper)}
.nav-toggle{
  display:none;
  width:44px;height:44px;
  border:1px solid var(--line);
  border-radius:var(--r-btn);
  background:transparent;
  align-items:center;
  justify-content:center;
  padding:0;
}
.nav-toggle span{
  position:relative;
  display:block;
  width:20px;height:1.5px;
  background:var(--ink-900);
  transition:transform .25s ease,opacity .2s ease;
}
.nav-toggle span::before,
.nav-toggle span::after{
  content:"";
  position:absolute;left:0;
  width:20px;height:1.5px;
  background:var(--ink-900);
  transition:transform .25s ease;
}
.nav-toggle span::before{top:-6px}
.nav-toggle span::after{top:6px}
.nav-toggle.is-open span{background:transparent}
.nav-toggle.is-open span::before{transform:translateY(6px) rotate(45deg)}
.nav-toggle.is-open span::after{transform:translateY(-6px) rotate(-45deg)}
.drawer{
  position:fixed;
  left:0;right:0;top:60px;bottom:0;
  z-index:49;
  background:var(--paper);
  padding:16px 20px 120px;
  overflow-y:auto;
  opacity:0;
  visibility:hidden;
  transform:translateY(-8px);
  transition:opacity .22s ease,transform .22s ease,visibility .22s;
}
.drawer.is-open{opacity:1;visibility:visible;transform:none}
.drawer a.drawer-link{
  display:flex;
  align-items:center;
  justify-content:space-between;
  font-size:18px;
  line-height:56px;
  border-bottom:1px solid var(--line);
  color:var(--ink-900);
}
.drawer a.drawer-link.is-active{color:var(--accent)}
.drawer-actions{
  position:fixed;
  left:0;right:0;bottom:0;
  padding:16px 20px 24px;
  background:var(--paper);
  border-top:1px solid var(--line);
}
body.is-locked{overflow:hidden}
/* ---------- breadcrumb ---------- */
.crumb-bar{border-bottom:1px solid var(--line);background:var(--paper)}
.crumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  padding:16px 0;
  font-size:13px;
  color:var(--ink-300);
}
.crumb li{display:flex;align-items:center;gap:8px}
.crumb li + li::before{content:"/";color:var(--line)}
.crumb a{color:var(--ink-300);transition:color .2s ease}
.crumb a:hover{color:var(--ink-900)}
.crumb li[aria-current]{color:var(--ink-700)}
/* ---------- hero ---------- */
.page-hero{
  position:relative;
  overflow:hidden;
  border-bottom:1px solid var(--line);
  padding:64px 0 56px;
  background-color:var(--paper);
  background-image:linear-gradient(rgba(247,245,240,.94),rgba(247,245,240,.96)),url("/assets/images/backpic/back-1.png");
  background-size:cover;
  background-position:center;
}
.page-hero::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:repeating-linear-gradient(to right,rgba(20,22,26,.04) 0 1px,transparent 1px 120px);
  pointer-events:none;
}
.hero-wave{
  position:absolute;
  left:0;right:0;bottom:0;
  width:100%;height:84px;
  color:rgba(30,77,67,.14);
  pointer-events:none;
}
.hero-grid{
  position:relative;
  display:grid;
  grid-template-columns:7fr 5fr;
  gap:48px;
  align-items:center;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--ink-500);
  text-transform:uppercase;
}
.page-title{
  margin-top:18px;
  font-size:clamp(32px,4.4vw,48px);
  line-height:1.2;
  font-weight:800;
  max-width:14em;
}
.lede{
  margin-top:20px;
  font-size:17px;
  line-height:1.8;
  color:var(--ink-500);
  max-width:34em;
}
.hero-actions{display:flex;flex-wrap:wrap;align-items:center;gap:20px;margin-top:32px}
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:48px;
  padding:13px 26px;
  font-size:14px;
  font-weight:500;
  border-radius:var(--r-btn);
  border:1px solid transparent;
  transition:background .18s ease,color .18s ease,border-color .18s ease,transform .12s ease;
}
.btn-primary{background:var(--accent);color:var(--paper)}
.btn-primary:hover{background:var(--accent-deep)}
.btn-primary:active{transform:translateY(1px)}
.btn-outline{background:transparent;border-color:var(--ink-900);color:var(--ink-900)}
.btn-outline:hover{background:var(--ink-900);color:var(--paper)}
.btn-arrow{transition:transform .18s ease}
.btn:hover .btn-arrow{transform:translateX(4px)}
.link-arrow{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-size:14px;
  color:var(--ink-900);
  position:relative;
}
.link-arrow::after{
  content:"";
  position:absolute;
  left:0;right:22px;bottom:-3px;
  height:1px;
  background:var(--ink-900);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .25s ease;
}
.link-arrow:hover::after{transform:scaleX(1)}
.link-arrow:hover .btn-arrow{transform:translateX(4px)}
.hero-stats{
  display:flex;
  margin-top:40px;
  padding-top:20px;
  border-top:1px solid var(--line);
}
.stat{flex:1;padding-right:20px}
.stat + .stat{border-left:1px solid var(--line);padding-left:20px}
.stat b{
  display:block;
  font-family:var(--mono);
  font-size:24px;
  font-weight:500;
  letter-spacing:-.01em;
  line-height:1.3;
}
.stat span{display:block;margin-top:4px;font-size:13px;color:var(--ink-500);line-height:1.5}
.hero-figure{
  position:relative;
  z-index:1;
}
.hero-figure::after{
  content:"";
  position:absolute;
  left:12px;top:12px;right:-12px;bottom:-12px;
  border:1px solid var(--line);
  border-radius:var(--r-card);
  z-index:-1;
  pointer-events:none;
}
.hero-figure img{
  width:100%;
  aspect-ratio:4/3;
  object-fit:cover;
  border-radius:var(--r-card);
  box-shadow:var(--shadow);
}
.hero-chip{
  position:absolute;
  left:16px;bottom:16px;
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  padding:12px 16px;
  box-shadow:var(--shadow);
}
.hero-chip b{
  display:block;
  font-family:var(--mono);
  font-size:15px;
  font-weight:500;
  letter-spacing:.02em;
}
.hero-chip span{display:block;font-size:12px;color:var(--ink-500);line-height:1.6}
/* ---------- sections ---------- */
.section{padding:88px 0}
.section--tight{padding:64px 0}
.section-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:32px;
  padding-bottom:20px;
  border-bottom:1px solid var(--line);
  margin-bottom:40px;
}
.section-head h2{font-size:clamp(24px,2.8vw,32px)}
.section-head p{max-width:32em;font-size:15px;color:var(--ink-500)}
/* ---------- category layout ---------- */
.cat-layout{
  display:grid;
  grid-template-columns:3fr 9fr;
  gap:56px;
  align-items:start;
}
.anchor-nav{
  position:sticky;
  top:100px;
  border-left:1px solid var(--line);
  padding-left:20px;
}
.anchor-nav .anchor-label{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--ink-300);
  margin-bottom:12px;
}
.anchor-nav a{
  position:relative;
  display:block;
  padding:10px 0 10px 0;
  font-size:14px;
  color:var(--ink-500);
  line-height:1.6;
  transition:color .2s ease;
}
.anchor-nav a::before{
  content:"";
  position:absolute;
  left:-21px;
  top:50%;
  width:2px;
  height:0;
  background:var(--accent);
  transform:translateY(-50%);
  transition:height .25s ease;
}
.anchor-nav a:hover{color:var(--ink-900)}
.anchor-nav a.is-current{color:var(--ink-900);font-weight:600}
.anchor-nav a.is-current::before{height:20px}
.cap-block{padding-bottom:8px}
.cap-block + .cap-block{
  margin-top:56px;
  padding-top:56px;
  border-top:1px solid var(--line);
}
.cap-title{
  position:relative;
  padding-left:16px;
  font-size:clamp(22px,2.4vw,28px);
}
.cap-title::before{
  content:"";
  position:absolute;
  left:0;top:.18em;
  width:4px;height:1.05em;
  background:var(--accent);
  border-radius:1px;
}
.cap-text{
  margin-top:16px;
  font-size:15px;
  line-height:1.85;
  color:var(--ink-500);
  max-width:34em;
}
.feat-list{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:16px 32px;
  margin-top:28px;
}
.feat-list li{
  position:relative;
  padding-left:18px;
  font-size:15px;
  line-height:1.8;
  color:var(--ink-700);
}
.feat-list li::before{
  content:"";
  position:absolute;
  left:0;
  top:.68em;
  width:5px;height:5px;
  background:var(--accent);
  border-radius:1px;
}
.feat-list li b{font-weight:600;color:var(--ink-900)}
/* ---------- timeline ---------- */
.timeline{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  overflow:hidden;
}
.step{
  background:var(--paper);
  padding:28px 24px 32px;
  transition:background .25s ease;
}
.step:hover{background:var(--paper-2)}
.step .num{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--accent);
}
.step h3{
  margin-top:12px;
  font-size:17px;
  font-weight:700;
  line-height:1.5;
}
.step p{
  margin-top:10px;
  font-size:14px;
  line-height:1.75;
  color:var(--ink-500);
}
.step .cycle{
  display:block;
  margin-top:16px;
  font-family:var(--mono);
  font-size:12px;
  color:var(--ink-300);
  letter-spacing:.06em;
}
/* ---------- cta bar ---------- */
.cta-bar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:32px;
  padding:32px 40px;
  background:var(--paper-2);
  border:1px solid var(--line);
  border-radius:var(--r-card);
}
.cta-bar h2{font-size:clamp(20px,2.2vw,26px);line-height:1.4}
.cta-bar p{margin-top:8px;font-size:14px;color:var(--ink-500);max-width:34em}
.cta-bar .btn{flex:none}
/* ---------- footer ---------- */
.site-footer{
  background:var(--ink-900);
  color:rgba(255,255,255,.72);
  border-top:1px solid rgba(255,255,255,.12);
  padding:72px 0 0;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.9fr 1fr 1fr 1fr;
  gap:40px;
  padding-bottom:56px;
}
.footer-brand .logo{margin-bottom:18px}
.footer-brand .logo-mark b{border-color:rgba(255,255,255,.75)}
.footer-brand .logo-text{color:#F7F5F0}
.footer-brand .logo-text span{color:rgba(255,255,255,.7)}
.footer-brand p{
  font-size:14px;
  line-height:1.85;
  color:rgba(255,255,255,.62);
  max-width:26em;
}
.footer-contact{margin-top:20px;display:grid;gap:10px}
.footer-contact li{
  display:flex;
  align-items:flex-start;
  gap:10px;
  font-size:14px;
  color:rgba(255,255,255,.72);
}
.footer-contact svg{
  width:16px;height:16px;
  flex:none;
  margin-top:4px;
  fill:none;
  stroke:currentColor;
  stroke-width:1.5;
  stroke-linecap:round;
  stroke-linejoin:round;
}
.footer-col h4{
  font-size:13px;
  font-weight:600;
  letter-spacing:.14em;
  color:rgba(255,255,255,.5);
  margin-bottom:16px;
}
.footer-col ul{display:grid;gap:10px}
.footer-col a{
  position:relative;
  display:inline-block;
  font-size:14px;
  color:rgba(255,255,255,.72);
  transition:color .2s ease;
}
.footer-col a::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:-2px;
  height:1px;
  background:rgba(255,255,255,.75);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .25s ease;
}
.footer-col a:hover{color:#F7F5F0}
.footer-col a:hover::after{transform:scaleX(1)}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:20px 0;
  border-top:1px solid rgba(255,255,255,.12);
  font-size:13px;
  color:rgba(255,255,255,.5);
}
.footer-col .col-toggle{display:none}
/* ---------- reveal ---------- */
.reveal{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .42s cubic-bezier(.2,.7,.3,1),transform .42s cubic-bezier(.2,.7,.3,1);
}
.reveal.is-in{opacity:1;transform:none}
/* ---------- responsive ---------- */
@media (max-width:1199px){
  .container{padding:0 24px}
  .section{padding:88px 0}
  .cat-layout{gap:40px}
}
@media (max-width:991px){
  .header-inner{height:60px;grid-template-columns:auto 1fr auto}
  .nav-group{display:none}
  .nav-toggle{display:inline-flex}
  .nav-group--right{display:none}
  .logo{grid-column:2;justify-self:center}
  .hero-grid{grid-template-columns:1fr;gap:32px}
  .hero-figure{order:2}
  .cat-layout{grid-template-columns:1fr;gap:32px}
  .anchor-nav{
    position:static;
    border-left:0;
    border-top:1px solid var(--line);
    border-bottom:1px solid var(--line);
    padding:14px 0;
    display:flex;
    gap:20px;
    overflow-x:auto;
    -webkit-overflow-scrolling:touch;
  }
  .anchor-nav .anchor-label{display:none}
  .anchor-nav a{white-space:nowrap;padding:6px 0}
  .anchor-nav a::before{display:none}
  .anchor-nav a.is-current{color:var(--accent)}
  .timeline{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .cta-bar{flex-direction:column;align-items:flex-start}
}
@media (max-width:767px){
  .container{padding:0 20px}
  .section{padding:64px 0}
  .page-hero{padding:40px 0 44px}
  .lede{font-size:16px}
  .hero-stats{flex-wrap:wrap;row-gap:16px}
  .stat{flex:0 0 50%;padding-right:16px}
  .stat + .stat{border-left:0;padding-left:0}
  .stat:nth-child(2){border-left:1px solid var(--line);padding-left:16px}
  .feat-list{grid-template-columns:1fr;gap:12px}
  .timeline{grid-template-columns:1fr}
  .section-head{flex-direction:column;align-items:flex-start;gap:12px}
  .cta-bar{padding:24px}
  .cta-bar .btn{width:100%}
  .footer-grid{grid-template-columns:1fr;gap:0;padding-bottom:32px}
  .footer-brand{margin-bottom:24px}
  .footer-col{border-top:1px solid rgba(255,255,255,.12)}
  .footer-col h4{margin:0}
  .footer-col .col-toggle{
    display:flex;
    align-items:center;
    justify-content:space-between;
    width:100%;
    background:transparent;
    border:0;
    padding:18px 0;
    font-size:13px;
    font-weight:600;
    letter-spacing:.14em;
    color:rgba(255,255,255,.6);
    text-align:left;
  }
  .footer-col .col-toggle::after{
    content:"+";
    font-family:var(--mono);
    font-size:16px;
    color:rgba(255,255,255,.6);
  }
  .footer-col.is-open .col-toggle::after{content:"−"}
  .footer-col h4{display:none}
  .footer-col ul{
    display:none;
    padding-bottom:18px;
  }
  .footer-col.is-open ul{display:grid}
  body:not(.js) .footer-col ul{display:grid}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
}
@media (max-width:575px){
  .btn{width:100%}
  .hero-actions{gap:12px}
  .hero-chip{padding:10px 12px}
  .hero-chip b{font-size:13px}
  .cap-title{font-size:21px}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .reveal{opacity:1;transform:none}
}

/* roulang page: category2 */
:root{
  --paper:#F7F5F0;
  --paper-2:#EFEBE3;
  --ink-900:#14161A;
  --ink-700:#2B2F36;
  --ink-500:#5A6068;
  --ink-300:#9AA0A6;
  --line:#DCD6CA;
  --accent:#C1531F;
  --accent-deep:#8E3A15;
  --jade:#1E4D43;
  --jade-2:#2F6B5C;
  --ok:#2F6B4A;
  --warn:#B07A20;
  --error:#A8332A;
  --radius-card:4px;
  --radius-btn:2px;
  --shadow-1:0 1px 2px rgba(20,22,26,.04);
  --shadow-2:0 12px 32px -12px rgba(20,22,26,.18);
  --font-sans:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:ui-monospace,"JetBrains Mono",Menlo,monospace;
  --pad-block:112px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink-900);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.85;
  letter-spacing:0;
  -webkit-font-smoothing:antialiased;
}
body.no-scroll{overflow:hidden}
img{max-width:100%;display:block;height:auto}
a{color:var(--ink-900);text-decoration:none}
button{font-family:inherit}
h1,h2,h3,h4{margin:0;font-weight:800;letter-spacing:-.02em;line-height:1.25}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
svg{display:block}
::selection{background:rgba(193,83,31,.16);color:var(--ink-900)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

.container{
  width:100%;
  max-width:1200px;
  margin:0 auto;
  padding:0 24px;
}
.section{padding:var(--pad-block) 0}
.section--tight{padding:72px 0}
.section--alt{background:var(--paper-2)}

/* ---------- 头部导航 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:50;
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background .25s ease,border-color .25s ease,box-shadow .25s ease;
}
.site-header.is-scrolled{
  background:rgba(247,245,240,.92);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.header-inner{
  position:relative;
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  height:76px;
  gap:16px;
}
.nav-group{display:flex;align-items:center;gap:28px}
.nav-group--left{justify-content:flex-start}
.nav-group--right{justify-content:flex-end;gap:24px}
.nav-link{
  position:relative;
  font-size:14px;
  color:var(--ink-700);
  padding:4px 0;
  transition:color .2s ease;
  white-space:nowrap;
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:0;
  height:1px;
  background:var(--ink-900);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .25s ease;
}
.nav-link:hover{color:var(--ink-900)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link.is-active{color:var(--ink-900);font-weight:500}
.nav-link.is-active::before{
  content:"";
  position:absolute;
  left:50%;
  bottom:-8px;
  width:24px;
  height:2px;
  background:var(--accent);
  transform:translateX(-50%);
}
.nav-link.is-active::after{display:none}
.nav-cta{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-size:14px;
  color:var(--ink-900);
  border:1px solid var(--ink-900);
  border-radius:var(--radius-btn);
  padding:9px 18px;
  transition:background .18s ease,color .18s ease,border-color .18s ease;
  white-space:nowrap;
}
.nav-cta:hover{background:var(--accent);border-color:var(--accent);color:var(--paper)}

.logo{
  display:inline-flex;
  align-items:center;
  gap:10px;
  justify-self:center;
}
.logo-mark{
  position:relative;
  width:22px;
  height:22px;
  flex:0 0 22px;
}
.logo-mark i{
  position:absolute;
  left:0;top:0;
  width:12px;height:12px;
  background:var(--accent);
  border-radius:1px;
}
.logo-mark b{
  position:absolute;
  right:0;bottom:0;
  width:12px;height:12px;
  border:1px solid var(--ink-900);
  border-radius:1px;
}
.logo-text{
  font-size:19px;
  font-weight:800;
  letter-spacing:-.02em;
  color:var(--ink-900);
  white-space:nowrap;
}
.logo-text span{font-weight:400;margin-left:2px}
.logo-text::before{content:"";display:none}

.menu-toggle{
  display:none;
  position:absolute;
  right:24px;
  top:50%;
  transform:translateY(-50%);
  width:44px;height:44px;
  background:transparent;
  border:0;
  cursor:pointer;
  padding:10px;
}
.menu-toggle span{
  display:block;
  height:1.5px;
  background:var(--ink-900);
  margin:5px 0;
  transition:transform .25s ease,opacity .2s ease;
}
.menu-toggle.is-open span:nth-child(1){transform:translateY(6.5px) rotate(45deg)}
.menu-toggle.is-open span:nth-child(2){opacity:0}
.menu-toggle.is-open span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg)}

.drawer{
  position:fixed;
  inset:0;
  z-index:60;
  background:var(--paper);
  display:flex;
  flex-direction:column;
  padding:0 20px 28px;
  opacity:0;
  visibility:hidden;
  transition:opacity .22s ease,visibility .22s ease;
}
.drawer.is-open{opacity:1;visibility:visible}
.drawer-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  height:60px;
  border-bottom:1px solid var(--line);
}
.drawer-close{
  width:44px;height:44px;
  background:transparent;
  border:0;
  cursor:pointer;
  position:relative;
}
.drawer-close::before,.drawer-close::after{
  content:"";
  position:absolute;
  left:50%;top:50%;
  width:18px;height:1.5px;
  background:var(--ink-900);
}
.drawer-close::before{transform:translate(-50%,-50%) rotate(45deg)}
.drawer-close::after{transform:translate(-50%,-50%) rotate(-45deg)}
.drawer-nav{flex:1;overflow-y:auto;padding-top:8px}
.drawer-nav a{
  display:flex;
  align-items:center;
  justify-content:space-between;
  font-size:18px;
  line-height:56px;
  border-bottom:1px solid var(--line);
  color:var(--ink-900);
}
.drawer-nav a.is-active{color:var(--accent)}
.drawer-foot{padding-top:20px}
.drawer-foot .btn{width:100%;justify-content:center}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:48px;
  padding:14px 26px;
  border-radius:var(--radius-btn);
  font-size:14px;
  font-weight:500;
  border:1px solid transparent;
  cursor:pointer;
  transition:background .18s ease,color .18s ease,border-color .18s ease,transform .12s ease;
}
.btn .arrow{transition:transform .18s ease}
.btn:hover .arrow{transform:translateX(4px)}
.btn:active{transform:translateY(1px)}
.btn--primary{background:var(--accent);color:var(--paper)}
.btn--primary:hover{background:var(--accent-deep)}
.btn--ghost{background:transparent;color:var(--ink-900);border-color:var(--ink-900)}
.btn--ghost:hover{background:var(--ink-900);color:var(--paper)}
.btn[disabled],.btn.is-disabled{opacity:.45;cursor:not-allowed;pointer-events:none}
.btn--light{background:var(--paper);color:var(--ink-900)}
.btn--light:hover{background:#fff}
.btn--outline-light{background:transparent;color:var(--paper);border-color:rgba(255,255,255,.7)}
.btn--outline-light:hover{background:rgba(255,255,255,.12)}

.link-more{
  position:relative;
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-size:14px;
  color:var(--ink-900);
  padding-bottom:2px;
}
.link-more::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:0;
  height:1px;
  background:var(--ink-900);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .25s ease;
}
.link-more:hover::after{transform:scaleX(1)}
.link-more:hover .arrow{transform:translateX(4px)}
.link-more .arrow{transition:transform .18s ease}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:8px;
  font-size:13px;
  color:var(--ink-300);
  padding-top:28px;
}
.breadcrumb ol{display:flex;align-items:center;flex-wrap:wrap;gap:8px}
.breadcrumb li{display:flex;align-items:center;gap:8px}
.breadcrumb li+li::before{content:"/";color:var(--line)}
.breadcrumb a{color:var(--ink-300);transition:color .2s ease}
.breadcrumb a:hover{color:var(--ink-900)}
.breadcrumb [aria-current]{color:var(--ink-700)}

/* ---------- 页面首屏 ---------- */
.page-hero{
  position:relative;
  overflow:hidden;
  border-bottom:1px solid var(--line);
  padding-bottom:0;
}
.page-hero::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:url('/assets/images/backpic/back-1.png');
  background-size:cover;
  background-position:center;
  opacity:.08;
  pointer-events:none;
}
.page-hero::after{
  content:"";
  position:absolute;
  inset:0;
  background-image:repeating-linear-gradient(to right,rgba(20,22,26,.04) 0 1px,transparent 1px 120px);
  pointer-events:none;
}
.page-hero>.container{position:relative;z-index:1}
.hero-grid{
  display:grid;
  grid-template-columns:7fr 5fr;
  gap:56px;
  align-items:start;
  padding:44px 0 56px;
}
.eyebrow{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--ink-500);
  margin-bottom:20px;
}
.page-hero h1{
  font-size:clamp(32px,4.4vw,52px);
  line-height:1.22;
  max-width:15em;
}
.hero-lead{
  margin-top:22px;
  font-size:18px;
  line-height:1.8;
  color:var(--ink-500);
  max-width:34em;
}
.hero-actions{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:24px;
  margin-top:32px;
}
.hero-side{
  border-left:1px solid var(--line);
  padding-left:32px;
  padding-top:6px;
}
.side-title{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--ink-500);
  margin-bottom:18px;
}
.side-list li{
  display:flex;
  gap:12px;
  padding:14px 0;
  border-bottom:1px solid var(--line);
  font-size:15px;
  color:var(--ink-700);
  line-height:1.7;
}
.side-list li:last-child{border-bottom:0}
.side-list .sq{
  flex:0 0 4px;
  width:4px;height:4px;
  background:var(--accent);
  margin-top:12px;
  border-radius:1px;
}
.hero-metrics{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  border-top:1px solid var(--line);
}
.metric{
  padding:28px 28px 28px 0;
  border-right:1px solid var(--line);
}
.metric:last-child{border-right:0;padding-right:0}
.metric .num{
  font-family:var(--font-mono);
  font-size:26px;
  line-height:1.2;
  color:var(--ink-900);
  letter-spacing:-.02em;
}
.metric .num em{font-style:normal;font-size:14px;color:var(--ink-500);margin-left:4px}
.metric .desc{
  margin-top:6px;
  font-size:13px;
  line-height:1.6;
  color:var(--ink-500);
}

/* ---------- 区块标题 ---------- */
.section-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:32px;
  padding-bottom:20px;
  border-bottom:1px solid var(--line);
  margin-bottom:40px;
}
.section-head h2{font-size:clamp(26px,3.4vw,38px);line-height:1.28}
.section-head p{font-size:15px;color:var(--ink-500);max-width:32em;text-align:right}
.section-head--plain{border-bottom:0;padding-bottom:0}

/* ---------- 解决方案卡片流 ---------- */
.solution-grid{
  display:grid;
  grid-template-columns:repeat(12,1fr);
  gap:24px;
  align-items:start;
}
.solution-card{
  grid-column:span 5;
  display:flex;
  flex-direction:column;
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  box-shadow:var(--shadow-1);
  overflow:hidden;
  transition:border-color .6s ease,box-shadow .3s ease;
}
.solution-card:nth-child(1),
.solution-card:nth-child(4){grid-column:span 7}
.solution-card:hover{border-color:var(--ink-300);box-shadow:var(--shadow-2)}
.card-media{
  position:relative;
  overflow:hidden;
  background:var(--paper-2);
}
.card-media img{
  width:100%;
  aspect-ratio:4/3;
  object-fit:cover;
  transition:transform .6s ease-out;
}
.solution-card:hover .card-media img{transform:scale(1.03)}
.card-body{
  padding:32px;
  display:flex;
  flex-direction:column;
  flex:1;
}
.card-index{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--accent);
  margin-bottom:14px;
}
.solution-card h3{
  font-size:clamp(20px,2vw,24px);
  line-height:1.35;
  margin-bottom:14px;
}
.card-text{
  font-size:15px;
  line-height:1.8;
  color:var(--ink-500);
  margin-bottom:20px;
}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:22px}
.tag{
  font-size:12px;
  letter-spacing:.04em;
  color:var(--ink-700);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  padding:4px 10px;
  line-height:1.5;
  background:var(--paper);
}
.card-foot{margin-top:auto}

/* ---------- 推进节奏 ---------- */
.steps{
  display:grid;
  grid-template-columns:repeat(5,1fr);
  gap:0;
  border-top:1px solid var(--line);
}
.step{
  padding:32px 24px 8px 0;
  border-right:1px solid var(--line);
  position:relative;
}
.step:last-child{border-right:0;padding-right:0}
.step .step-no{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--ink-300);
  display:block;
  margin-bottom:14px;
}
.step h3{font-size:18px;line-height:1.4;margin-bottom:10px}
.step p{font-size:14px;line-height:1.8;color:var(--ink-500)}

/* ---------- 适配团队 ---------- */
.fit-grid{
  display:grid;
  grid-template-columns:5fr 7fr;
  gap:56px;
  align-items:start;
}
.fit-grid h2{font-size:clamp(26px,3.4vw,38px);line-height:1.28;margin-bottom:20px}
.fit-grid .fit-intro{font-size:15px;line-height:1.85;color:var(--ink-500);max-width:32em}
.fit-list{border-top:1px solid var(--line)}
.fit-item{
  display:grid;
  grid-template-columns:64px 1fr;
  gap:20px;
  padding:24px 0;
  border-bottom:1px solid var(--line);
}
.fit-item .k{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--accent);
  padding-top:4px;
}
.fit-item h3{font-size:18px;line-height:1.4;margin-bottom:8px}
.fit-item p{font-size:15px;line-height:1.8;color:var(--ink-500)}

/* ---------- 深底交付规范 ---------- */
.records{
  background:var(--jade);
  color:var(--paper);
  padding:var(--pad-block) 0;
}
.records .section-head{border-bottom-color:rgba(255,255,255,.12)}
.records .section-head h2{color:var(--paper)}
.records .section-head p{color:rgba(255,255,255,.72)}
.records-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:1px;
  background:rgba(255,255,255,.12);
  border:1px solid rgba(255,255,255,.12);
  border-radius:var(--radius-card);
  overflow:hidden;
}
.record{
  background:var(--jade);
  padding:32px;
  transition:background .3s ease;
}
.record:hover{background:rgba(255,255,255,.06)}
.record .k{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:rgba(255,255,255,.5);
  margin-bottom:18px;
}
.record .big{
  font-family:var(--font-mono);
  font-size:32px;
  line-height:1.2;
  color:var(--paper);
  letter-spacing:-.02em;
}
.record .big em{font-style:normal;font-size:13px;color:rgba(255,255,255,.72);margin-left:6px;letter-spacing:0}
.record p{
  margin-top:10px;
  font-size:13px;
  line-height:1.75;
  color:rgba(255,255,255,.72);
}
.records-note{
  margin-top:24px;
  font-size:13px;
  color:rgba(255,255,255,.5);
}

/* ---------- FAQ ---------- */
.faq-grid{
  display:grid;
  grid-template-columns:4fr 8fr;
  gap:56px;
  align-items:start;
}
.faq-aside{position:sticky;top:104px}
.faq-aside h2{font-size:clamp(26px,3.4vw,38px);line-height:1.28;margin-bottom:16px}
.faq-aside p{font-size:15px;line-height:1.85;color:var(--ink-500);margin-bottom:20px;max-width:26em}
.faq-list{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item summary{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  cursor:pointer;
  list-style:none;
  padding:20px 0;
  font-size:17px;
  font-weight:500;
  color:var(--ink-900);
  line-height:1.6;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-icon{
  position:relative;
  flex:0 0 20px;
  width:20px;height:20px;
}
.faq-icon::before,.faq-icon::after{
  content:"";
  position:absolute;
  left:50%;top:50%;
  background:var(--ink-700);
  transform:translate(-50%,-50%);
}
.faq-icon::before{width:14px;height:1px}
.faq-icon::after{width:1px;height:14px;transition:transform .26s ease}
.faq-item[open] .faq-icon::after{transform:translate(-50%,-50%) scaleY(0)}
.faq-answer{
  padding-bottom:20px;
  font-size:15px;
  line-height:1.85;
  color:var(--ink-500);
  max-width:44em;
}
.faq-item[open] summary{color:var(--ink-900)}

/* ---------- CTA 横条 ---------- */
.cta-band{
  background:var(--paper-2);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  padding:72px 0;
  text-align:center;
}
.cta-band h2{
  font-size:clamp(24px,3vw,34px);
  line-height:1.3;
  margin-bottom:16px;
}
.cta-band p{
  font-size:15px;
  line-height:1.85;
  color:var(--ink-500);
  max-width:36em;
  margin:0 auto 28px;
}
.cta-actions{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:16px;
}

/* ---------- 页脚 ---------- */
.site-footer{
  background:var(--ink-900);
  color:rgba(255,255,255,.72);
  padding:72px 0 0;
  border-top:1px solid rgba(255,255,255,.12);
}
.footer-grid{
  display:grid;
  grid-template-columns:5fr 2fr 2fr 2fr;
  gap:40px;
  padding-bottom:56px;
}
.footer-brand .logo{margin-bottom:20px}
.footer-brand .logo-text{color:var(--paper)}
.footer-brand .logo-mark b{border-color:rgba(255,255,255,.6)}
.footer-brand p{
  font-size:14px;
  line-height:1.85;
  color:rgba(255,255,255,.72);
  max-width:26em;
  margin-bottom:22px;
}
.footer-contact li{
  display:flex;
  align-items:flex-start;
  gap:10px;
  font-size:14px;
  line-height:1.7;
  color:rgba(255,255,255,.72);
  padding:6px 0;
}
.footer-contact svg{
  width:16px;height:16px;
  flex:0 0 16px;
  margin-top:5px;
  fill:none;
  stroke:rgba(255,255,255,.5);
  stroke-width:1.5;
  stroke-linecap:round;
  stroke-linejoin:round;
}
.footer-col h4{
  font-size:13px;
  font-weight:500;
  letter-spacing:.14em;
  color:rgba(255,255,255,.5);
  margin-bottom:18px;
}
.footer-col ul li{padding:6px 0}
.footer-col a{
  position:relative;
  display:inline-block;
  font-size:14px;
  color:rgba(255,255,255,.72);
  transition:color .2s ease;
}
.footer-col a::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:-2px;
  height:1px;
  background:var(--paper);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .25s ease;
}
.footer-col a:hover{color:var(--paper)}
.footer-col a:hover::after{transform:scaleX(1)}
.footer-bottom{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  flex-wrap:wrap;
  border-top:1px solid rgba(255,255,255,.12);
  padding:22px 0;
  font-size:13px;
  color:rgba(255,255,255,.5);
}

/* ---------- 入场动效 ---------- */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .42s cubic-bezier(.2,.7,.3,1),transform .42s cubic-bezier(.2,.7,.3,1)}
.reveal.is-visible{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:1199px){
  :root{--pad-block:88px}
  .header-inner{gap:14px}
  .nav-group{gap:18px}
  .nav-group--right{gap:16px}
  .hero-grid{gap:40px}
  .card-body{padding:28px}
}
@media (max-width:991px){
  :root{--pad-block:88px}
  .nav-group{display:none}
  .menu-toggle{display:block}
  .header-inner{height:60px;grid-template-columns:1fr auto 1fr}
  .logo-text{font-size:17px}
  .hero-grid{grid-template-columns:1fr;gap:32px;padding:32px 0 44px}
  .hero-side{border-left:0;border-top:1px solid var(--line);padding-left:0;padding-top:24px}
  .solution-grid{grid-template-columns:repeat(2,1fr)}
  .solution-card,
  .solution-card:nth-child(1),
  .solution-card:nth-child(4){grid-column:span 1}
  .steps{grid-template-columns:repeat(2,1fr)}
  .step{border-right:0;border-bottom:1px solid var(--line);padding:28px 0}
  .step:nth-child(2n){padding-left:24px;border-left:1px solid var(--line)}
  .fit-grid{grid-template-columns:1fr;gap:32px}
  .records-grid{grid-template-columns:repeat(2,1fr)}
  .faq-grid{grid-template-columns:1fr;gap:32px}
  .faq-aside{position:static}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .footer-brand{grid-column:1/-1}
  .section-head{flex-direction:column;align-items:flex-start;gap:12px}
  .section-head p{text-align:left}
}
@media (max-width:767px){
  :root{--pad-block:64px}
  .container{padding:0 20px}
  body{font-size:15px;line-height:1.8}
  .page-hero h1{font-size:32px;line-height:1.3}
  .hero-lead{font-size:16px}
  .hero-actions{gap:16px}
  .hero-actions .btn{width:100%}
  .hero-metrics{grid-template-columns:repeat(2,1fr)}
  .metric{border-right:0;border-bottom:1px solid var(--line);padding:20px 16px 20px 0}
  .metric:nth-child(2n){padding-left:16px;border-left:1px solid var(--line)}
  .metric:last-child{border-bottom:0}
  .solution-grid{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  .step{padding:24px 0}
  .step:nth-child(2n){padding-left:0;border-left:0}
  .records-grid{grid-template-columns:1fr}
  .record{padding:24px}
  .card-body{padding:24px}
  .faq-item summary{font-size:16px;padding:18px 0}
  .cta-actions{flex-direction:column}
  .cta-actions .btn{width:100%}
  .footer-grid{grid-template-columns:1fr;gap:0;padding-bottom:24px}
  .footer-brand{padding-bottom:24px}
  .footer-col{border-top:1px solid rgba(255,255,255,.12)}
  .footer-col h4{
    margin:0;
    padding:16px 0;
    cursor:pointer;
    position:relative;
  }
  .footer-col h4::after{
    content:"+";
    position:absolute;
    right:2px;top:50%;
    transform:translateY(-50%);
    font-size:16px;
    color:rgba(255,255,255,.5);
  }
  .footer-col.is-open h4::after{content:"−"}
  .footer-col ul{display:none;padding-bottom:16px}
  .footer-col.is-open ul{display:block}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
}
@media (max-width:575px){
  .page-hero h1{font-size:28px}
  .hero-metrics{grid-template-columns:1fr}
  .metric{border-left:0!important;padding-left:0!important}
  .fit-item{grid-template-columns:1fr;gap:8px}
  .cta-band{padding:56px 0}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
  .reveal{opacity:1;transform:none}
}

/* roulang page: category3 */
:root{
  --paper:#F7F5F0;
  --paper-2:#EFEBE3;
  --ink-900:#14161A;
  --ink-700:#2B2F36;
  --ink-500:#5A6068;
  --ink-300:#9AA0A6;
  --line:#DCD6CA;
  --accent:#C1531F;
  --accent-deep:#8E3A15;
  --jade:#1E4D43;
  --jade-2:#2F6B5C;
  --ok:#2F6B4A;
  --warn:#B07A20;
  --error:#A8332A;
  --sans:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --mono:ui-monospace,"JetBrains Mono",Menlo,Consolas,monospace;
  --radius-card:4px;
  --radius-btn:2px;
  --radius-badge:2px;
  --shadow-rest:0 1px 2px rgba(20,22,26,.04);
  --shadow-hover:0 12px 32px -12px rgba(20,22,26,.18);
  --ease:cubic-bezier(.2,.7,.3,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink-900);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.85;
  letter-spacing:0;
  -webkit-font-smoothing:antialiased;
}
body.no-scroll{overflow:hidden}
h1,h2,h3,h4{margin:0;font-weight:800;letter-spacing:-.02em;line-height:1.25;color:var(--ink-900)}
p{margin:0}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit}
ul,ol{margin:0;padding:0;list-style:none}
svg{display:block}
::selection{background:rgba(193,83,31,.18)}

.container{
  width:100%;
  max-width:1200px;
  margin:0 auto;
  padding:0 24px;
}
.section{padding:112px 0}
.section--tight{padding:88px 0}
.section--paper2{background:var(--paper-2)}
.eyebrow{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--ink-500);
  display:flex;
  align-items:center;
  gap:12px;
}
.eyebrow::before{content:"";width:24px;height:1px;background:var(--line)}
.section-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:32px;
  padding-bottom:28px;
  border-bottom:1px solid var(--line);
  margin-bottom:40px;
}
.section-head h2{font-size:clamp(26px,3.2vw,40px);line-height:1.2}
.section-head p{font-size:15px;color:var(--ink-500);max-width:34em;line-height:1.8}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  min-height:48px;
  padding:14px 26px;
  font-size:14px;
  font-weight:500;
  border-radius:var(--radius-btn);
  border:1px solid transparent;
  cursor:pointer;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease),box-shadow .18s var(--ease);
}
.btn svg{width:16px;height:16px;transition:transform .18s var(--ease)}
.btn:hover svg{transform:translateX(4px)}
.btn:active{transform:translateY(1px)}
.btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.btn--primary{background:var(--accent);color:#FBF9F5}
.btn--primary:hover{background:var(--accent-deep)}
.btn--ghost{background:transparent;border-color:var(--ink-900);color:var(--ink-900)}
.btn--ghost:hover{background:var(--ink-900);color:#FBF9F5}
.btn--light{background:#FBF9F5;color:var(--ink-900);border-color:#FBF9F5}
.btn--light:hover{background:#EFEBE3}
.btn--outline-light{background:transparent;border-color:rgba(255,255,255,.7);color:#FBF9F5}
.btn--outline-light:hover{background:rgba(255,255,255,.12)}
.btn[disabled],.btn.is-disabled{opacity:.45;cursor:not-allowed;box-shadow:none}
.btn[disabled]:hover,.btn.is-disabled:hover{background:var(--accent);transform:none}

.link-arrow{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-size:14px;
  color:var(--ink-900);
  position:relative;
  padding-bottom:2px;
}
.link-arrow svg{width:14px;height:14px;transition:transform .25s var(--ease)}
.link-arrow::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:0;
  height:1px;
  background:currentColor;
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .25s var(--ease);
}
.link-arrow:hover::after{transform:scaleX(1)}
.link-arrow:hover svg{transform:translateX(4px)}

.badge{
  display:inline-flex;
  align-items:center;
  padding:3px 8px;
  font-size:12px;
  letter-spacing:.06em;
  border:1px solid var(--line);
  border-radius:var(--radius-badge);
  color:var(--ink-500);
  background:transparent;
}
.badge--accent{border-color:rgba(193,83,31,.45);color:var(--accent)}

/* ---------- 头部导航 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:50;
  background:transparent;
  transition:background-color .2s var(--ease),box-shadow .2s var(--ease);
}
.site-header.is-scrolled{
  background:rgba(247,245,240,.92);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  box-shadow:0 1px 0 var(--line);
}
.nav-inner{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:16px;
  height:76px;
}
.nav-group{display:flex;align-items:center;gap:28px}
.nav-group--left{justify-content:flex-start}
.nav-group--right{justify-content:flex-end}
.nav-link{
  position:relative;
  font-size:14px;
  color:var(--ink-700);
  white-space:nowrap;
  transition:color .18s var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;bottom:-8px;
  width:100%;height:1px;
  background:var(--ink-900);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .25s var(--ease);
}
.nav-link:hover{color:var(--ink-900)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link.is-active{color:var(--ink-900)}
.nav-link.is-active::before{
  content:"";
  position:absolute;
  left:50%;bottom:-12px;
  width:24px;height:2px;
  background:var(--accent);
  transform:translateX(-50%);
}
.nav-cta{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:8px 18px;
  font-size:14px;
  border:1px solid var(--ink-900);
  border-radius:var(--radius-btn);
  color:var(--ink-900);
  transition:background-color .18s var(--ease),color .18s var(--ease);
}
.nav-cta:hover{background:var(--accent);border-color:var(--accent);color:#FBF9F5}

.logo{
  display:inline-flex;
  align-items:center;
  gap:10px;
  justify-self:center;
}
.logo-mark{position:relative;display:inline-block;width:20px;height:20px;flex:none}
.logo-mark i{position:absolute;left:0;top:4px;width:12px;height:12px;background:var(--accent)}
.logo-mark b{position:absolute;left:6px;top:10px;width:12px;height:12px;border:1px solid var(--ink-900)}
.logo-text{font-size:19px;font-weight:800;letter-spacing:-.02em;white-space:nowrap}
.logo-text span{font-weight:400;margin-left:2px}

.nav-toggle{
  display:none;
  width:44px;height:44px;
  border:1px solid var(--line);
  border-radius:var(--radius-btn);
  background:transparent;
  cursor:pointer;
  position:relative;
  align-items:center;
  justify-content:center;
}
.nav-toggle span{
  position:absolute;
  left:11px;right:11px;
  height:1.5px;
  background:var(--ink-900);
  transition:transform .22s var(--ease),opacity .22s var(--ease);
}
.nav-toggle span:nth-child(1){top:15px}
.nav-toggle span:nth-child(2){top:21px}
.nav-toggle span:nth-child(3){top:27px}
.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)}

.mobile-drawer{
  position:fixed;
  inset:0;
  z-index:60;
  background:var(--paper);
  display:none;
  flex-direction:column;
  padding:20px 20px 24px;
}
.mobile-drawer.is-open{display:flex}
.mobile-drawer__head{display:flex;align-items:center;justify-content:space-between;height:60px;border-bottom:1px solid var(--line)}
.mobile-drawer__list{margin-top:8px}
.mobile-drawer__list a{
  display:flex;
  align-items:center;
  justify-content:space-between;
  height:56px;
  font-size:18px;
  color:var(--ink-900);
  border-bottom:1px solid var(--line);
}
.mobile-drawer__list a.is-active{color:var(--accent)}
.mobile-drawer__foot{margin-top:auto;padding-top:24px}
.mobile-drawer__foot .btn{width:100%}
.drawer-close{
  width:40px;height:40px;
  border:1px solid var(--line);
  background:transparent;
  border-radius:var(--radius-btn);
  cursor:pointer;
  font-size:20px;
  line-height:1;
  color:var(--ink-900);
}

/* ---------- 面包屑 ---------- */
.crumbs{padding:28px 0 0}
.crumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--ink-300)}
.crumbs li{display:inline-flex;align-items:center;gap:8px}
.crumbs li + li::before{content:"/";color:var(--line)}
.crumbs a{color:var(--ink-300);transition:color .18s var(--ease)}
.crumbs a:hover{color:var(--ink-900)}
.crumbs [aria-current="page"]{color:var(--ink-700)}

/* ---------- Hero ---------- */
.page-hero{
  position:relative;
  padding:40px 0 0;
  overflow:hidden;
  border-bottom:1px solid var(--line);
}
.page-hero__bg{
  position:absolute;
  inset:0;
  background-image:url("/assets/images/backpic/back-1.png");
  background-size:cover;
  background-position:center;
  opacity:.07;
  pointer-events:none;
}
.page-hero__grid{
  position:absolute;
  inset:0;
  background-image:linear-gradient(90deg,rgba(20,22,26,.045) 1px,transparent 1px);
  background-size:120px 100%;
  pointer-events:none;
  mask-image:linear-gradient(180deg,rgba(0,0,0,.9),transparent 92%);
  -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.9),transparent 92%);
}
.hero-wave{
  position:absolute;
  right:-60px;
  top:60px;
  width:620px;
  max-width:60%;
  color:var(--line);
  opacity:.85;
  pointer-events:none;
}
.page-hero .container{position:relative;z-index:1}
.hero-body{max-width:820px;padding:56px 0 72px}
.hero-body h1{
  font-size:clamp(30px,4.6vw,52px);
  line-height:1.2;
  margin:20px 0 24px;
  max-width:16em;
}
.hero-lead{
  font-size:18px;
  line-height:1.8;
  color:var(--ink-500);
  max-width:34em;
}
.hero-actions{display:flex;flex-wrap:wrap;align-items:center;gap:20px;margin-top:36px}
.hero-metrics{
  display:flex;
  flex-wrap:wrap;
  gap:0;
  margin-top:48px;
  border-top:1px solid var(--line);
  padding-top:24px;
}
.hero-metrics > div{
  padding-right:32px;
  margin-right:32px;
  border-right:1px solid var(--line);
}
.hero-metrics > div:last-child{border-right:0;margin-right:0;padding-right:0}
.hero-metrics b{
  display:block;
  font-family:var(--mono);
  font-size:26px;
  font-weight:500;
  letter-spacing:-.02em;
  color:var(--ink-900);
  line-height:1.2;
}
.hero-metrics span{font-size:13px;color:var(--ink-500)}

/* ---------- 场景主体：sticky 图 + 长文 ---------- */
.scenario-layout{
  display:grid;
  grid-template-columns:5fr 7fr;
  gap:56px;
  align-items:start;
}
.scenario-media{position:sticky;top:100px}
.media-frame{
  position:relative;
  border-radius:var(--radius-card);
  overflow:hidden;
  background:var(--paper-2);
  box-shadow:var(--shadow-rest);
}
.media-frame img{
  width:100%;
  aspect-ratio:4/3;
  object-fit:cover;
  transition:transform .6s ease-out;
}
.media-frame:hover img{transform:scale(1.03)}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  border:1px solid rgba(20,22,26,.08);
  border-radius:var(--radius-card);
  pointer-events:none;
}
.media-outline{
  position:absolute;
  left:12px;right:-12px;
  bottom:-12px;
  top:12px;
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  pointer-events:none;
}
.media-chip{
  position:absolute;
  left:16px;
  bottom:16px;
  background:rgba(247,245,240,.96);
  border:1px solid var(--line);
  border-radius:var(--radius-badge);
  padding:12px 16px;
  backdrop-filter:blur(4px);
}
.media-chip b{
  display:block;
  font-family:var(--mono);
  font-size:13px;
  letter-spacing:.06em;
  color:var(--ink-900);
}
.media-chip span{display:block;font-size:12px;color:var(--ink-500)}
.media-caption{
  margin-top:28px;
  font-size:13px;
  line-height:1.9;
  color:var(--ink-500);
  max-width:32em;
}
.media-caption strong{color:var(--ink-900);font-weight:500}

.story-stack{padding-top:4px}
.story{
  display:grid;
  grid-template-columns:88px 1fr;
  gap:16px;
  padding:8px 0 48px;
}
.story + .story{border-top:1px solid var(--line);padding-top:48px}
.story__rail{position:relative;padding-left:26px}
.story__rail::before{
  content:"";
  position:absolute;
  left:0;top:8px;bottom:-40px;
  width:1px;
  background:var(--line);
}
.story:last-of-type .story__rail::before{bottom:8px}
.story__rail span{
  position:relative;
  display:inline-block;
  background:var(--paper);
  padding-right:6px;
  font-family:var(--mono);
  font-size:14px;
  letter-spacing:.12em;
  color:var(--accent);
}
.section--paper2 .story__rail span{background:var(--paper-2)}
.story__body h2{
  font-size:clamp(22px,2.6vw,30px);
  line-height:1.3;
  margin-bottom:16px;
}
.story__body p{
  font-size:15px;
  line-height:1.9;
  color:var(--ink-500);
  max-width:34em;
}
.story__body p + p{margin-top:14px}
.tick-list{margin-top:22px;display:grid;gap:10px}
.tick-list li{
  display:flex;
  gap:12px;
  font-size:14px;
  line-height:1.7;
  color:var(--ink-700);
}
.tick-list li::before{
  content:"";
  flex:none;
  width:4px;height:4px;
  margin-top:10px;
  background:var(--accent);
}
.story-note{
  margin-top:26px;
  border-left:3px solid var(--accent);
  background:var(--paper-2);
  border-radius:var(--radius-card);
  padding:18px 22px;
  font-size:14px;
  line-height:1.85;
  color:var(--ink-700);
}

/* ---------- 场景资料带 ---------- */
.facts{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:0;
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  overflow:hidden;
  background:var(--paper);
}
.facts > div{padding:28px 26px}
.facts > div + div{border-left:1px solid var(--line)}
.facts b{
  display:block;
  font-family:var(--mono);
  font-size:30px;
  font-weight:500;
  letter-spacing:-.02em;
  margin-bottom:8px;
}
.facts p{font-size:14px;line-height:1.8;color:var(--ink-500)}

/* ---------- FAQ ---------- */
.faq-layout{display:grid;grid-template-columns:4fr 8fr;gap:56px;align-items:start}
.faq-aside{position:sticky;top:100px}
.faq-aside h2{font-size:clamp(24px,3vw,36px);line-height:1.25;margin-bottom:16px}
.faq-aside p{font-size:15px;line-height:1.85;color:var(--ink-500);margin-bottom:22px;max-width:28em}
.faq-item{border-top:1px solid var(--line)}
.faq-item:last-of-type{border-bottom:1px solid var(--line)}
.faq-item summary{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  padding:20px 0;
  font-size:17px;
  font-weight:500;
  color:var(--ink-900);
  cursor:pointer;
  list-style:none;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary i{
  position:relative;
  flex:none;
  width:20px;height:20px;
  transition:transform .26s var(--ease);
}
.faq-item summary i::before,
.faq-item summary i::after{
  content:"";
  position:absolute;
  background:var(--ink-700);
}
.faq-item summary i::before{left:0;top:9.5px;width:20px;height:1px}
.faq-item summary i::after{left:9.5px;top:0;width:1px;height:20px}
.faq-item[open] summary i{transform:rotate(45deg)}
.faq-item[open] summary{color:var(--ink-900)}
.faq-body{padding:0 0 20px;font-size:15px;line-height:1.85;color:var(--ink-500);max-width:44em}

/* ---------- 返回入口 ---------- */
.back-strip{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  padding:28px 0;
  border-top:1px solid var(--line);
}
.back-strip .back-links{display:flex;flex-wrap:wrap;gap:28px}

/* ---------- CTA ---------- */
.cta-band{
  position:relative;
  background:var(--jade);
  color:#F7F5F0;
  overflow:hidden;
  padding:96px 0;
}
.cta-band__bg{
  position:absolute;
  inset:0;
  background-image:url("/assets/images/backpic/back-2.png");
  background-size:cover;
  background-position:center;
  opacity:.08;
  pointer-events:none;
}
.cta-band__mark{
  position:absolute;
  right:-40px;
  bottom:-70px;
  font-family:var(--mono);
  font-size:220px;
  line-height:1;
  letter-spacing:-.04em;
  color:rgba(255,255,255,.04);
  pointer-events:none;
  user-select:none;
}
.cta-band .container{position:relative;z-index:1;text-align:center}
.cta-band h2{
  color:#F7F5F0;
  font-size:clamp(26px,3.4vw,38px);
  line-height:1.3;
  max-width:22em;
  margin:0 auto 18px;
}
.cta-band p{
  color:rgba(255,255,255,.72);
  font-size:15px;
  line-height:1.85;
  max-width:38em;
  margin:0 auto 32px;
}
.cta-band .hero-actions{justify-content:center;margin-top:0}

/* ---------- 页脚 ---------- */
.site-footer{
  background:var(--ink-900);
  color:rgba(255,255,255,.72);
  padding:72px 0 0;
  border-top:1px solid rgba(255,255,255,.12);
}
.footer-grid{
  display:grid;
  grid-template-columns:5fr 2fr 2fr 2fr;
  gap:40px;
  padding-bottom:56px;
}
.footer-brand .logo{margin-bottom:20px}
.site-footer .logo-text{color:#F7F5F0}
.site-footer .logo-mark b{border-color:rgba(255,255,255,.55)}
.footer-brand p{
  font-size:14px;
  line-height:1.85;
  color:rgba(255,255,255,.62);
  max-width:32em;
}
.footer-contact{margin-top:24px;display:grid;gap:12px}
.footer-contact li{display:flex;align-items:flex-start;gap:10px;font-size:14px;color:rgba(255,255,255,.62)}
.footer-contact svg{
  width:16px;height:16px;
  flex:none;
  margin-top:4px;
  fill:none;
  stroke:rgba(255,255,255,.45);
  stroke-width:1.5;
  stroke-linecap:round;
  stroke-linejoin:round;
}
.footer-col h4{
  font-size:13px;
  font-weight:500;
  letter-spacing:.14em;
  color:rgba(255,255,255,.5);
  margin-bottom:18px;
}
.footer-col ul{display:grid;gap:12px}
.footer-col a{
  position:relative;
  font-size:14px;
  color:rgba(255,255,255,.72);
  transition:color .18s var(--ease);
}
.footer-col a::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:-3px;
  height:1px;
  background:currentColor;
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .25s var(--ease);
}
.footer-col a:hover{color:#F7F5F0}
.footer-col a:hover::after{transform:scaleX(1)}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:22px 0;
  border-top:1px solid rgba(255,255,255,.12);
  font-size:13px;
  color:rgba(255,255,255,.5);
}
.footer-col__toggle{display:none}

/* ---------- 动效 ---------- */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .42s var(--ease),transform .42s var(--ease)}
.reveal.is-in{opacity:1;transform:none}
.reveal[data-delay="1"]{transition-delay:.06s}
.reveal[data-delay="2"]{transition-delay:.12s}
.reveal[data-delay="3"]{transition-delay:.18s}

/* ---------- 断点 ---------- */
@media (max-width:1199px){
  .section{padding:88px 0}
  .section--tight{padding:72px 0}
  .scenario-layout{gap:40px}
  .story{grid-template-columns:72px 1fr}
}
@media (max-width:991px){
  .nav-group,.nav-cta{display:none}
  .nav-toggle{display:inline-flex}
  .nav-inner{height:60px;grid-template-columns:auto 1fr auto}
  .logo{justify-self:center}
  .page-hero{padding-top:24px}
  .hero-body{padding:40px 0 56px}
  .hero-wave{width:420px;opacity:.5;top:20px}
  .scenario-layout{grid-template-columns:1fr;gap:40px}
  .scenario-media{position:static}
  .media-outline{display:none}
  .faq-layout{grid-template-columns:1fr;gap:32px}
  .faq-aside{position:static}
  .facts{grid-template-columns:1fr}
  .facts > div + div{border-left:0;border-top:1px solid var(--line)}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .footer-brand{grid-column:1 / -1}
  .cta-band{padding:72px 0}
}
@media (max-width:767px){
  .container{padding:0 20px}
  .section{padding:64px 0}
  .section--tight{padding:56px 0}
  .hero-body h1{font-size:clamp(26px,7vw,34px)}
  .hero-lead{font-size:16px}
  .hero-metrics > div{padding-right:20px;margin-right:20px}
  .hero-metrics b{font-size:22px}
  .story{grid-template-columns:1fr;gap:12px;padding-bottom:36px}
  .story + .story{padding-top:36px}
  .story__rail{padding-left:0;display:flex;align-items:center;gap:12px}
  .story__rail::before{display:none}
  .story__rail span{padding-right:0}
  .story__rail::after{
    content:"";
    flex:1;
    height:1px;
    background:var(--line);
  }
  .story__body h2{font-size:22px}
  .story__body p,.faq-body{font-size:15px}
  .section-head{flex-direction:column;align-items:flex-start;gap:12px}
  .faq-item summary{font-size:16px;padding:18px 0}
  .footer-grid{grid-template-columns:1fr;gap:0;padding-bottom:32px}
  .footer-col{border-top:1px solid rgba(255,255,255,.12)}
  .footer-col h4{margin:0}
  .footer-col__toggle{
    display:flex;
    align-items:center;
    justify-content:space-between;
    width:100%;
    padding:18px 0;
    background:transparent;
    border:0;
    color:rgba(255,255,255,.5);
    font-size:13px;
    letter-spacing:.14em;
    cursor:pointer;
  }
  .footer-col__toggle i{
    position:relative;
    width:14px;height:14px;
    transition:transform .24s var(--ease);
  }
  .footer-col__toggle i::before,
  .footer-col__toggle i::after{content:"";position:absolute;background:rgba(255,255,255,.5)}
  .footer-col__toggle i::before{left:0;top:6.5px;width:14px;height:1px}
  .footer-col__toggle i::after{left:6.5px;top:0;width:1px;height:14px}
  .footer-col.is-open .footer-col__toggle i{transform:rotate(45deg)}
  .footer-col ul{display:none;padding-bottom:18px}
  .footer-col.is-open ul{display:grid}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
  .btn{min-height:48px}
  .hero-actions .btn{width:100%}
  .hero-actions{flex-direction:column;align-items:stretch;gap:12px}
  .hero-actions .link-arrow{justify-content:center}
  .back-strip .back-links{gap:20px}
  .cta-band__mark{font-size:140px;bottom:-40px}
}
@media (max-width:519px){
  .hero-body{padding:32px 0 48px}
  .hero-metrics{gap:20px 0}
  .hero-metrics > div{width:50%;padding-right:0;margin-right:0;border-right:0}
  .hero-metrics > div:nth-child(odd){padding-right:16px}
  .media-chip{padding:10px 12px;left:12px;bottom:12px}
  .back-strip{flex-direction:column;align-items:flex-start}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  .reveal{opacity:1;transform:none}
}

/* roulang page: category4 */
:root{
  --paper:#F7F5F0;
  --paper-2:#EFEBE3;
  --ink-900:#14161A;
  --ink-700:#2B2F36;
  --ink-500:#5A6068;
  --ink-300:#9AA0A6;
  --line:#DCD6CA;
  --accent:#C1531F;
  --accent-deep:#8E3A15;
  --jade:#1E4D43;
  --jade-2:#2F6B5C;
  --ok:#2F6B4A;
  --warn:#B07A20;
  --error:#A8332A;
  --radius-card:4px;
  --radius-btn:2px;
  --shadow-1:0 1px 2px rgba(20,22,26,.04);
  --shadow-2:0 12px 32px -12px rgba(20,22,26,.18);
  --mono:ui-monospace,"JetBrains Mono",Menlo,monospace;
  --sans:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Microsoft YaHei",system-ui,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink-900);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
}
body.no-scroll{overflow:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit}
h1,h2,h3,h4,p,ul,ol,figure{margin:0}
ul,ol{padding:0;list-style:none}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.visually-hidden{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;
  clip:rect(0 0 0 0);white-space:nowrap;border:0;
}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}

/* ---------- 导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background .25s ease,border-color .25s ease,box-shadow .25s ease;
}
.site-header.is-scrolled{
  background:rgba(247,245,240,.92);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  border-bottom-color:var(--line);
}
.header-inner{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:24px;
  height:76px;
}
.nav-group{display:flex;align-items:center;gap:26px}
.nav-group--right{justify-content:flex-end}
.nav-link{
  position:relative;
  font-size:14px;
  color:var(--ink-700);
  padding:6px 0;
  white-space:nowrap;
  transition:color .2s ease;
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:var(--ink-900);transform:scaleX(0);transform-origin:left;
  transition:transform .25s ease;
}
.nav-link:hover{color:var(--ink-900)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link.is-active{color:var(--ink-900)}
.nav-link.is-active::before{
  content:"";position:absolute;left:50%;bottom:-8px;width:24px;height:2px;
  background:var(--accent);transform:translateX(-50%);
}
.nav-cta{
  display:inline-flex;align-items:center;
  font-size:14px;font-weight:500;
  padding:9px 18px;min-height:38px;
  border:1px solid var(--ink-900);border-radius:var(--radius-btn);
  color:var(--ink-900);background:transparent;
  transition:background .18s ease,color .18s ease,border-color .18s ease;
}
.nav-cta:hover{background:var(--accent);border-color:var(--accent);color:var(--paper)}

.logo{display:inline-flex;align-items:center;gap:10px;justify-self:center}
.logo-mark{position:relative;display:inline-block;width:18px;height:18px;flex:0 0 18px}
.logo-mark i{position:absolute;left:0;top:0;width:12px;height:12px;background:var(--accent);display:block}
.logo-mark b{position:absolute;left:4px;top:4px;width:12px;height:12px;border:1px solid var(--ink-900);display:block}
.logo-text{
  font-size:19px;font-weight:800;letter-spacing:-.02em;white-space:nowrap;
  color:var(--ink-900);line-height:1;
}
.logo-text span{font-weight:400}

.nav-toggle{
  display:none;
  grid-column:3;justify-self:end;
  width:44px;height:44px;padding:0;
  border:1px solid transparent;border-radius:var(--radius-btn);
  background:transparent;cursor:pointer;
  position:relative;z-index:70;
}
.nav-toggle span{
  position:absolute;left:10px;right:10px;height:1.5px;background:var(--ink-900);
  transition:transform .25s ease,opacity .2s ease;
}
.nav-toggle span:nth-child(1){top:16px}
.nav-toggle span:nth-child(2){top:22px}
.nav-toggle span:nth-child(3){top:28px}
.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)}

.nav-drawer{
  position:fixed;inset:0;z-index:60;
  background:var(--paper);
  padding:92px 24px 32px;
  display:flex;flex-direction:column;
  transform:translateY(-100%);
  visibility:hidden;
  transition:transform .32s cubic-bezier(.2,.7,.3,1),visibility .32s;
}
.nav-drawer.is-open{transform:translateY(0);visibility:visible}
.drawer-nav{display:flex;flex-direction:column}
.drawer-nav a{
  font-size:18px;line-height:56px;color:var(--ink-900);
  border-bottom:1px solid var(--line);
}
.drawer-nav a:first-child{border-top:1px solid var(--line)}
.drawer-nav a.is-active{color:var(--accent)}
.drawer-cta{
  margin-top:auto;
  display:flex;align-items:center;justify-content:center;
  min-height:50px;border-radius:var(--radius-btn);
  background:var(--accent);color:var(--paper);
  font-size:15px;font-weight:500;
}

/* ---------- 按钮 / 链接 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-size:14px;font-weight:500;line-height:1;
  padding:0 26px;min-height:48px;
  border-radius:var(--radius-btn);
  border:1px solid transparent;
  cursor:pointer;
  transition:background .18s ease,color .18s ease,border-color .18s ease,transform .12s ease;
}
.btn--primary{background:var(--accent);color:#F7F5F0}
.btn--primary:hover{background:var(--accent-deep)}
.btn--primary:active{transform:translateY(1px)}
.btn--ghost{background:transparent;border-color:var(--ink-900);color:var(--ink-900)}
.btn--ghost:hover{background:var(--ink-900);color:var(--paper)}
.btn[disabled],.btn.is-disabled{opacity:.45;cursor:not-allowed;pointer-events:none}
.link-arrow{
  display:inline-flex;align-items:center;gap:6px;
  font-size:14px;color:var(--ink-900);position:relative;
}
.link-arrow::after{
  content:"";position:absolute;left:0;right:0;bottom:-3px;height:1px;
  background:var(--ink-900);transform:scaleX(0);transform-origin:left;
  transition:transform .25s ease;
}
.link-arrow:hover::after{transform:scaleX(1)}
.link-arrow i{font-style:normal;transition:transform .18s ease}
.link-arrow:hover i{transform:translateX(4px)}

/* ---------- 页头 hero ---------- */
.page-hero{
  position:relative;
  border-bottom:1px solid var(--line);
  background-image:url("/assets/images/backpic/back-1.png");
  background-size:cover;
  background-position:center;
  overflow:hidden;
}
.page-hero::before{
  content:"";position:absolute;inset:0;
  background:rgba(247,245,240,.94);
}
.page-hero-inner{
  position:relative;
  display:grid;
  grid-template-columns:7fr 5fr;
  gap:56px;
  align-items:center;
  padding:64px 0 72px;
}
.eyebrow{
  font-family:var(--mono);
  font-size:12px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--ink-500);margin-bottom:18px;
}
.page-hero h1{
  font-size:clamp(30px,4.2vw,46px);
  line-height:1.22;
  font-weight:800;
  letter-spacing:-.02em;
  max-width:15em;
  margin-bottom:20px;
}
.lede{
  font-size:17px;
  line-height:1.8;
  color:var(--ink-500);
  max-width:32em;
  margin-bottom:32px;
}
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  font-size:13px;color:var(--ink-300);margin-bottom:26px;
}
.breadcrumb li{display:flex;align-items:center;gap:10px}
.breadcrumb li + li::before{content:"/";color:var(--line)}
.breadcrumb a{color:var(--ink-300);transition:color .2s ease}
.breadcrumb a:hover{color:var(--ink-900)}
.breadcrumb li[aria-current]{color:var(--ink-700)}

.search-form{display:flex;gap:12px;max-width:560px}
.search-form input{
  flex:1 1 auto;
  height:48px;
  padding:0 16px;
  font-size:15px;
  color:var(--ink-900);
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:4px;
  transition:border-color .2s ease,box-shadow .2s ease;
}
.search-form input::placeholder{color:var(--ink-300)}
.search-form input:hover{border-color:var(--ink-300)}
.search-form input:focus{
  outline:none;
  border-color:var(--accent);
  box-shadow:0 0 0 3px rgba(193,83,31,.12);
}
.search-form .btn{flex:0 0 auto}
.search-note{
  margin-top:14px;font-size:13px;color:var(--ink-300);
}

.page-hero-media{position:relative}
.page-hero-media::after{
  content:"";position:absolute;left:12px;top:12px;right:-12px;bottom:-12px;
  border:1px solid var(--line);border-radius:var(--radius-card);
  pointer-events:none;
}
.page-hero-media img{
  position:relative;z-index:1;
  width:100%;aspect-ratio:16/10;object-fit:cover;
  border-radius:var(--radius-card);
  border:1px solid var(--line);
}

/* ---------- 区块 ---------- */
.section{padding:96px 0}
.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px;
  padding-bottom:20px;border-bottom:1px solid var(--line);
  margin-bottom:40px;
}
.section-head h2{
  font-size:clamp(24px,3vw,34px);font-weight:800;letter-spacing:-.02em;line-height:1.28;
}
.section-head p{font-size:15px;color:var(--ink-500);max-width:34em}

/* ---------- 帮助中心布局 ---------- */
.help-layout{
  display:grid;
  grid-template-columns:8fr 4fr;
  gap:56px;
  align-items:start;
}
.help-main{display:flex;flex-direction:column;gap:56px}
.faq-group h2{
  font-size:22px;font-weight:700;letter-spacing:-.01em;
  padding-left:14px;
  border-left:3px solid var(--accent);
  line-height:1.4;
  margin-bottom:8px;
}
.faq-group > p{
  font-size:14px;color:var(--ink-500);padding-left:14px;margin-bottom:16px;
}
.faq-list{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item summary{
  display:flex;align-items:flex-start;justify-content:space-between;gap:20px;
  padding:18px 0;
  font-size:17px;font-weight:500;color:var(--ink-900);line-height:1.6;
  cursor:pointer;list-style:none;
  transition:color .2s ease;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary:hover{color:var(--accent-deep)}
.plus{
  position:relative;flex:0 0 14px;width:14px;height:14px;margin-top:7px;
  transition:transform .26s ease;
}
.plus::before,.plus::after{
  content:"";position:absolute;background:var(--ink-700);
}
.plus::before{left:0;top:6.5px;width:14px;height:1px}
.plus::after{left:6.5px;top:0;width:1px;height:14px}
.faq-item[open] .plus{transform:rotate(45deg)}
.faq-item[open] summary{color:var(--ink-900)}
.faq-answer{
  padding:0 0 20px;
  font-size:15px;line-height:1.85;color:var(--ink-500);
  max-width:40em;
}

/* ---------- 联系卡 ---------- */
.help-side{position:sticky;top:100px}
.contact-card{
  background:var(--paper-2);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  padding:32px;
}
.contact-card h2{
  font-size:20px;font-weight:700;letter-spacing:-.01em;margin-bottom:16px;line-height:1.4;
}
.contact-card p{font-size:14px;line-height:1.85;color:var(--ink-500);margin-bottom:14px}
.contact-card .btn{width:100%;margin-top:8px}
.contact-meta{
  margin-top:26px;padding-top:22px;border-top:1px solid var(--line);
  display:flex;flex-direction:column;gap:12px;
}
.contact-meta li{
  display:flex;align-items:center;gap:10px;
  font-size:13px;color:var(--ink-500);
}
.contact-meta svg{
  width:16px;height:16px;flex:0 0 16px;
  fill:none;stroke:var(--ink-700);stroke-width:1.5;
  stroke-linecap:round;stroke-linejoin:round;
}

/* ---------- 文字型 CTA ---------- */
.cta-text{
  padding:24px 0 96px;
  text-align:center;
}
.cta-text p{
  font-size:16px;color:var(--ink-700);max-width:34em;margin:0 auto 18px;line-height:1.8;
}
.cta-text .actions{
  display:flex;flex-wrap:wrap;justify-content:center;gap:12px 32px;
  font-size:14px;
}

/* ---------- 页脚 ---------- */
.site-footer{
  background:var(--ink-900);
  color:rgba(255,255,255,.72);
  border-top:1px solid rgba(255,255,255,.12);
  padding:72px 0 0;
}
.footer-grid{
  display:grid;
  grid-template-columns:5fr 2.3fr 2.3fr 2.3fr;
  gap:40px;
  padding-bottom:56px;
}
.footer-brand .logo{justify-self:start;margin-bottom:20px}
.footer-brand .logo-mark b{border-color:rgba(255,255,255,.55)}
.footer-brand .logo-text{color:var(--paper)}
.footer-brand p{
  font-size:14px;line-height:1.85;color:rgba(255,255,255,.66);
  max-width:32em;margin-bottom:24px;
}
.footer-contact{display:flex;flex-direction:column;gap:12px}
.footer-contact li{
  display:flex;align-items:center;gap:10px;font-size:13px;color:rgba(255,255,255,.6);
}
.footer-contact svg{
  width:16px;height:16px;flex:0 0 16px;
  fill:none;stroke:rgba(255,255,255,.55);stroke-width:1.5;
  stroke-linecap:round;stroke-linejoin:round;
}
.footer-col h4{
  font-size:13px;font-weight:500;letter-spacing:.14em;
  color:rgba(255,255,255,.46);margin-bottom:18px;
}
.footer-col ul{display:flex;flex-direction:column;gap:12px}
.footer-col a{
  font-size:14px;color:rgba(255,255,255,.72);position:relative;
  transition:color .2s ease;
}
.footer-col a::after{
  content:"";position:absolute;left:0;right:0;bottom:-2px;height:1px;
  background:var(--paper);transform:scaleX(0);transform-origin:left;
  transition:transform .25s ease;
}
.footer-col a:hover{color:var(--paper)}
.footer-col a:hover::after{transform:scaleX(1)}
.footer-bottom{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;
  padding:22px 0;
  border-top:1px solid rgba(255,255,255,.12);
  font-size:13px;color:rgba(255,255,255,.5);
}

/* ---------- 动效 ---------- */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .42s cubic-bezier(.2,.7,.3,1),transform .42s cubic-bezier(.2,.7,.3,1)}
.reveal.is-in{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .reveal{opacity:1;transform:none}
}

/* ---------- 响应式 ---------- */
@media (max-width:1199px){
  .header-inner{gap:18px}
  .nav-group{gap:20px}
  .help-layout{gap:40px}
}
@media (max-width:991px){
  .nav-group{display:none}
  .header-inner{grid-template-columns:1fr auto 1fr;height:60px}
  .logo{grid-column:2;justify-self:center}
  .nav-toggle{display:block}
  .page-hero-inner{grid-template-columns:1fr;gap:36px;padding:44px 0 56px}
  .page-hero-media{order:2}
  .page-hero-media::after{display:none}
  .section{padding:72px 0}
  .help-layout{grid-template-columns:1fr;gap:40px}
  .help-side{position:static}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .footer-brand{grid-column:1 / -1}
}
@media (max-width:767px){
  .container{padding:0 20px}
  body{font-size:15px;line-height:1.82}
  .logo-text{font-size:17px}
  .page-hero h1{font-size:clamp(26px,7vw,34px);line-height:1.3}
  .lede{font-size:15px}
  .search-form{flex-wrap:wrap}
  .search-form input{flex:1 1 100%}
  .search-form .btn{width:100%}
  .section{padding:64px 0}
  .section-head{margin-bottom:28px}
  .help-main{gap:44px}
  .faq-item summary{font-size:16px;padding:16px 0}
  .faq-answer{font-size:14.5px}
  .contact-card{padding:24px}
  .cta-text{padding:16px 0 64px}
  .footer-grid{grid-template-columns:1fr;gap:0;padding-bottom:32px}
  .footer-brand{padding-bottom:28px}
  .footer-col{border-top:1px solid rgba(255,255,255,.12)}
  .footer-col h4{
    margin:0;padding:18px 0;cursor:pointer;position:relative;
    display:flex;align-items:center;justify-content:space-between;
  }
  .footer-col h4::after{
    content:"+";font-size:16px;line-height:1;color:rgba(255,255,255,.5);
    transition:transform .25s ease;
  }
  .footer-col.is-open h4::after{transform:rotate(45deg)}
  .footer-col ul{display:none;padding-bottom:18px}
  .footer-col.is-open ul{display:flex}
  .footer-bottom{flex-direction:column;gap:6px;font-size:12.5px}
}
@media (max-width:520px){
  .page-hero h1{font-size:26px}
  .eyebrow{font-size:11px}
  .breadcrumb{font-size:12px}
  .btn{width:100%}
  .cta-text .actions .link-arrow{width:auto}
}