/* roulang page: index */
:root{
  --accent:#C8502D;
  --accent-dark:#A8401F;
  --teal:#234A47;
  --gold:#B08A4F;
  --ink:#16171A;
  --body:#3C3F45;
  --muted:#787B82;
  --line:#E2DDD3;
  --paper:#F5F2EC;
  --surface:#FFFFFF;
  --surface-2:#FBFAF7;
  --placeholder:#EFEAE0;
  --danger:#B3261E;
  --success:#2E6B4F;
  --font-serif:"Noto Serif SC","Songti SC",serif;
  --font-sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-num:"Space Grotesk","Inter",system-ui,sans-serif;
  --radius-btn:2px;
  --radius-card:4px;
  --shadow-card:0 2px 8px rgba(22,23,26,.06);
  --shadow-float:0 12px 32px rgba(22,23,26,.12);
  --ease:cubic-bezier(.22,.61,.36,1);
  --sidebar-w:248px;
}
*{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  color:var(--body);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,p,figure,blockquote,ul,ol{margin:0;}
ul,ol{padding:0;list-style:none;}
img{display:block;max-width:100%;height:auto;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;border:none;background:none;cursor:pointer;}
input,textarea,select{font:inherit;}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;}
::selection{background:rgba(200,80,45,.18);}

.layout{display:flex;align-items:flex-start;min-height:100vh;}

/* ============ 侧边导航 ============ */
.sidebar{
  position:sticky;top:0;
  flex:0 0 var(--sidebar-w);
  width:var(--sidebar-w);
  height:100vh;
  background:var(--surface-2);
  border-right:1px solid var(--line);
  display:flex;flex-direction:column;
  overflow-y:auto;
  padding:28px 0 24px;
  z-index:30;
}
.brand{padding:0 22px 22px;}
.brand-mark{
  display:block;
  font-family:var(--font-serif);
  font-weight:700;
  font-size:22px;
  line-height:1.25;
  letter-spacing:-.01em;
  color:var(--ink);
}
.brand-mark em{font-style:normal;color:var(--accent);}
.brand-sub{
  margin-top:6px;
  font-family:var(--font-num);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--muted);
  text-transform:uppercase;
}
.nav{display:flex;flex-direction:column;}
.nav-link{
  position:relative;
  display:flex;align-items:center;justify-content:space-between;
  gap:8px;
  height:44px;
  padding:0 22px;
  font-size:14px;
  color:var(--body);
  transition:background .16s var(--ease),color .16s var(--ease);
}
.nav-link:hover{background:#F0ECE3;color:var(--ink);}
.nav-link.is-active{background:#F0ECE3;color:var(--ink);font-weight:500;}
.nav-link.is-active::before{
  content:"";position:absolute;left:0;top:8px;bottom:8px;width:2px;background:var(--accent);
}
.nav-arrow{font-size:12px;color:var(--muted);transition:transform .16s var(--ease);}
.nav-link:hover .nav-arrow{transform:translateX(2px);color:var(--accent);}
.sidebar-divider{height:1px;background:var(--line);margin:18px 22px;}
.sidebar-foot{margin-top:auto;padding:20px 22px 0;}
.sidebar-note{font-size:13px;color:var(--muted);line-height:1.6;}
.sidebar-note strong{display:block;color:var(--ink);font-weight:500;margin-bottom:2px;}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 22px;
  font-size:15px;font-weight:500;
  border-radius:var(--radius-btn);
  border:1px solid transparent;
  transition:background .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease),transform .16s var(--ease);
  white-space:nowrap;
}
.btn .arrow{font-size:13px;transition:transform .16s var(--ease);}
.btn:hover .arrow{transform:translateX(4px);}
.btn-primary{background:var(--accent);color:#fff;}
.btn-primary:hover{background:var(--accent-dark);}
.btn-primary:active{transform:translateY(1px);}
.btn-ghost{border-color:var(--ink);color:var(--ink);background:transparent;}
.btn-ghost:hover{background:var(--ink);color:#fff;}
.btn-block{width:100%;}
.btn-sm{height:38px;padding:0 16px;font-size:14px;}
.btn:disabled{opacity:.45;cursor:not-allowed;}

.link-more{
  display:inline-flex;align-items:center;gap:6px;
  font-size:14px;color:var(--accent);font-weight:500;
}
.link-more .arrow{transition:transform .16s var(--ease);}
.link-more:hover .arrow{transform:translateX(4px);}

/* ============ 移动端顶栏与抽屉 ============ */
.mobile-bar{
  display:none;
  position:sticky;top:0;z-index:50;
  height:56px;
  background:#fff;
  border-bottom:1px solid var(--line);
  align-items:center;justify-content:space-between;
  padding:0 18px;
}
.mobile-brand{
  font-family:var(--font-serif);
  font-size:17px;font-weight:700;color:var(--ink);
}
.mobile-brand em{font-style:normal;color:var(--accent);}
.burger{
  width:40px;height:40px;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:5px;
  border-radius:var(--radius-btn);
}
.burger span{display:block;width:18px;height:1.5px;background:var(--ink);transition:transform .24s var(--ease),opacity .24s var(--ease);}
.burger.is-open span:nth-child(1){transform:translateY(6.5px) rotate(45deg);}
.burger.is-open span:nth-child(2){opacity:0;}
.burger.is-open span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg);}

.drawer{
  position:fixed;inset:0;z-index:80;
  background:#fff;
  display:flex;flex-direction:column;
  transform:translateX(100%);
  visibility:hidden;
  transition:transform .32s var(--ease),visibility .32s var(--ease);
}
.drawer.is-open{transform:translateX(0);visibility:visible;}
.drawer-head{
  height:56px;flex:0 0 56px;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 18px;border-bottom:1px solid var(--line);
}
.drawer-close{font-size:22px;line-height:1;color:var(--ink);width:40px;height:40px;}
.drawer-body{flex:1;overflow-y:auto;}
.drawer-link{
  display:flex;align-items:center;justify-content:space-between;
  height:52px;padding:0 18px;
  font-size:16px;color:var(--ink);
  border-bottom:1px solid var(--line);
}
.drawer-link.is-active{color:var(--accent);font-weight:500;}
.drawer-link .nav-arrow{font-size:13px;}
.drawer-foot{padding:16px 18px 26px;border-top:1px solid var(--line);}

/* ============ 主内容 ============ */
.main{flex:1;min-width:0;}
.container{width:100%;max-width:1320px;margin:0 auto;padding:0 40px;}
.section{padding:96px 0;}
.section--tight{padding:72px 0;}
.section-head{
  display:flex;align-items:flex-end;justify-content:space-between;gap:24px;
  margin-bottom:40px;flex-wrap:wrap;
}
.eyebrow{
  display:inline-block;
  font-family:var(--font-num);
  font-size:12px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--accent);font-weight:500;
  margin-bottom:16px;
}
.section-title{
  font-family:var(--font-serif);
  font-size:clamp(24px,2.6vw,34px);
  line-height:1.3;letter-spacing:-.01em;
  color:var(--ink);font-weight:700;
}
.section-desc{margin-top:12px;font-size:15px;color:var(--muted);max-width:640px;}

/* ============ Hero ============ */
.hero{padding:72px 0 64px;position:relative;overflow:hidden;}
.hero-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:40px;align-items:center;}
.hero-copy{grid-column:span 7;}
.hero h1{
  font-family:var(--font-serif);
  font-size:clamp(32px,4.2vw,54px);
  line-height:1.18;letter-spacing:-.01em;
  color:var(--ink);font-weight:700;
  margin-bottom:20px;
}
.hero-sub{font-size:17px;line-height:1.8;color:var(--body);max-width:560px;}
.hero-actions{display:flex;gap:14px;margin-top:32px;flex-wrap:wrap;}
.hero-stats{
  display:flex;gap:0;margin-top:40px;
  border-top:1px solid var(--line);padding-top:0;
  flex-wrap:wrap;
}
.hero-stat{
  flex:1 1 0;min-width:120px;
  padding:18px 18px 0 0;
}
.hero-stat + .hero-stat{border-left:1px solid var(--line);padding-left:18px;}
.hero-stat b{
  display:block;font-family:var(--font-num);font-size:20px;font-weight:600;color:var(--ink);
  letter-spacing:-.01em;
}
.hero-stat span{font-size:13px;color:var(--muted);}
.hero-visual{
  grid-column:span 5;position:relative;
}
.hero-visual img{
  width:100%;aspect-ratio:4/3;object-fit:cover;
  border-radius:var(--radius-card);
  border:1px solid var(--line);
  background:var(--placeholder);
}
.hero-visual::after{
  content:"";position:absolute;right:-14px;bottom:-14px;
  width:96px;height:96px;background:var(--accent);
  border-radius:var(--radius-card);z-index:-1;
}
.hero-chip{
  position:absolute;left:18px;bottom:18px;
  background:rgba(255,255,255,.94);
  border:1px solid var(--line);
  border-radius:var(--radius-btn);
  padding:6px 12px;
  font-family:var(--font-num);font-size:12px;letter-spacing:.08em;
  color:var(--ink);
}

/* ============ 指标细条 ============ */
.metrics{
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  background:var(--surface);
}
.metrics-grid{display:grid;grid-template-columns:repeat(4,1fr);}
.metric{
  padding:22px 24px;
  border-left:1px solid var(--line);
}
.metric:first-child{border-left:none;}
.metric b{
  display:block;font-family:var(--font-num);font-size:17px;font-weight:600;color:var(--ink);
}
.metric span{font-size:13px;color:var(--muted);}

/* ============ 精选卡片 ============ */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.card{
  display:flex;flex-direction:column;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  overflow:hidden;
  transition:transform .24s var(--ease),box-shadow .24s var(--ease),border-color .24s var(--ease);
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-card);border-color:var(--accent);}
.card-media{position:relative;overflow:hidden;background:var(--placeholder);}
.card-media img{width:100%;aspect-ratio:16/10;object-fit:cover;transition:transform .32s var(--ease);}
.card:hover .card-media img{transform:scale(1.04);}
.badge{
  display:inline-flex;align-items:center;height:22px;padding:0 9px;
  font-size:12px;line-height:1;
  background:var(--placeholder);color:var(--ink);
  border-radius:2px;
}
.badge--accent{background:transparent;border:1px solid var(--accent);color:var(--accent);}
.card-media .badge{position:absolute;left:14px;top:14px;background:rgba(255,255,255,.94);}
.card-body{padding:20px 22px 22px;display:flex;flex-direction:column;flex:1;}
.card-title{
  font-family:var(--font-serif);
  font-size:17px;font-weight:600;color:var(--ink);
  line-height:1.5;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.card-desc{
  margin-top:10px;font-size:14px;color:var(--muted);line-height:1.7;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.card-foot{
  margin-top:auto;padding-top:18px;
  display:flex;align-items:center;justify-content:space-between;
  font-family:var(--font-num);font-size:12px;color:var(--muted);
  border-top:1px solid var(--line);margin-top:18px;
}
.card-foot .arrow{color:var(--accent);transition:transform .16s var(--ease);}
.card:hover .card-foot .arrow{transform:translateX(4px);}
.card--feature{grid-column:span 2;}
.card--feature .card-media img{aspect-ratio:21/9;}
@media (min-width:1024px){
  .card--feature .card-title{font-size:22px;}
}

/* ============ 评价轮播 ============ */
.reviews{background:var(--surface-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.review-wrap{position:relative;}
.review-track{
  display:grid;grid-auto-flow:column;
  grid-auto-columns:calc((100% - 48px) / 3);
  gap:24px;
  overflow-x:auto;
  scroll-snap-type:x mandatory;
  scrollbar-width:none;
  padding-bottom:4px;
}
.review-track::-webkit-scrollbar{display:none;}
.review-card{
  scroll-snap-align:start;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  padding:26px 24px;
  display:flex;flex-direction:column;
  min-height:236px;
}
.quote{
  font-family:var(--font-serif);
  font-size:36px;line-height:1;color:var(--gold);
  margin-bottom:10px;
}
.review-text{font-size:15px;line-height:1.85;color:var(--body);flex:1;}
.review-person{
  display:flex;align-items:center;gap:12px;
  margin-top:22px;padding-top:18px;border-top:1px solid var(--line);
}
.avatar{
  width:32px;height:32px;border-radius:50%;
  background:var(--teal);color:#fff;
  display:flex;align-items:center;justify-content:center;
  font-size:13px;font-family:var(--font-num);
  flex:0 0 32px;
}
.review-person b{display:block;font-size:14px;font-weight:500;color:var(--ink);}
.review-person span{font-size:12px;color:var(--muted);}
.review-nav{display:flex;gap:10px;justify-content:flex-end;margin-top:24px;}
.rbtn{
  width:40px;height:40px;
  border:1px solid var(--ink);border-radius:var(--radius-btn);
  display:flex;align-items:center;justify-content:center;
  font-size:15px;color:var(--ink);background:transparent;
  transition:background .16s var(--ease),color .16s var(--ease);
}
.rbtn:hover{background:var(--ink);color:#fff;}

/* ============ 保障条 ============ */
.assure{background:var(--teal);color:#fff;}
.assure-grid{display:grid;grid-template-columns:repeat(4,1fr);}
.assure-item{
  padding:36px 26px;
  border-left:1px solid rgba(255,255,255,.14);
  display:flex;gap:14px;align-items:flex-start;
}
.assure-item:first-child{border-left:none;}
.assure-icon{
  flex:0 0 26px;width:26px;height:26px;
  display:flex;align-items:center;justify-content:center;
  color:#fff;
}
.assure-icon svg{width:22px;height:22px;stroke:currentColor;fill:none;stroke-width:1.4;}
.assure-item b{display:block;font-size:14px;font-weight:500;margin-bottom:4px;}
.assure-item p{font-size:12px;line-height:1.6;color:rgba(255,255,255,.72);}

/* ============ 最新信息 ============ */
.news-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:0 40px;}
.news-item{
  display:block;
  padding:26px 0;
  border-bottom:1px solid var(--line);
  transition:background .16s var(--ease);
}
.news-item:hover .news-title{color:var(--accent);}
.news-item--lead{grid-column:span 2;padding-top:0;}
.news-meta{display:flex;align-items:center;gap:12px;margin-bottom:10px;}
.news-date{font-family:var(--font-num);font-size:12px;color:var(--muted);}
.news-title{
  font-family:var(--font-serif);
  font-size:18px;font-weight:600;color:var(--ink);line-height:1.5;
  transition:color .16s var(--ease);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.news-item--lead .news-title{font-size:clamp(20px,2.2vw,26px);}
.news-desc{
  margin-top:10px;font-size:14px;color:var(--muted);line-height:1.7;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.news-more{margin-top:20px;font-size:13px;color:var(--muted);}
.empty{
  min-height:150px;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;
  border:1px dashed var(--line);
  border-radius:var(--radius-card);
  background:var(--surface);
  padding:32px 20px;
}
.empty p{font-size:14px;color:var(--muted);}

/* ============ FAQ ============ */
.faq{max-width:880px;}
.faq-item{
  border-bottom:1px solid var(--line);
  background:transparent;
}
.faq-item summary{
  list-style:none;
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:22px 0;
  font-family:var(--font-serif);
  font-size:17px;font-weight:600;color:var(--ink);
  cursor:pointer;
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{
  content:"+";
  font-family:var(--font-num);font-size:20px;line-height:1;color:var(--accent);
  flex:0 0 auto;transition:transform .24s var(--ease);
}
.faq-item[open] summary::after{content:"−";}
.faq-body{padding:0 0 24px;font-size:15px;line-height:1.85;color:var(--body);max-width:720px;}

/* ============ CTA 整幅 ============ */
.cta-band{
  background:var(--ink);
  color:#fff;
  padding:64px 0;
}
.cta-inner{
  display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;
}
.cta-inner h2{
  font-family:var(--font-serif);
  font-size:clamp(22px,2.6vw,32px);
  line-height:1.35;font-weight:700;letter-spacing:-.01em;
}
.cta-inner p{margin-top:10px;font-size:15px;color:rgba(255,255,255,.7);max-width:560px;}
.cta-actions{display:flex;gap:14px;flex-wrap:wrap;}
.btn-light{background:#fff;color:var(--ink);}
.btn-light:hover{background:var(--accent);color:#fff;}
.btn-outline-light{border:1px solid rgba(255,255,255,.5);color:#fff;}
.btn-outline-light:hover{background:#fff;color:var(--ink);border-color:#fff;}

/* ============ 页脚 ============ */
.footer{
  background:#16171A;
  color:#fff;
  padding:64px 0 0;
}
.footer-grid{
  display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px;
  padding-bottom:48px;
}
.footer-brand{
  font-family:var(--font-serif);
  font-size:19px;font-weight:700;color:#fff;
}
.footer-brand em{font-style:normal;color:var(--accent);}
.footer-tag{
  margin-top:12px;font-size:13px;line-height:1.8;color:rgba(255,255,255,.62);
  max-width:280px;
}
.footer-col h3{
  font-size:13px;font-weight:500;letter-spacing:.1em;text-transform:uppercase;
  color:rgba(255,255,255,.55);margin-bottom:16px;
}
.footer-col a,.footer-col p{
  display:block;font-size:13px;line-height:2;color:rgba(255,255,255,.78);
}
.footer-col a:hover{color:#fff;text-decoration:underline;}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.12);
  padding:22px 0 30px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:12px;color:rgba(255,255,255,.5);
}

/* ============ 响应式 ============ */
@media (max-width:1199px){
  .container{padding:0 32px;}
  .hero-copy{grid-column:span 7;}
  .hero-visual{grid-column:span 5;}
  .review-track{grid-auto-columns:calc((100% - 24px) / 2);}
}
@media (max-width:1023px){
  .layout{display:block;}
  .sidebar{display:none;}
  .mobile-bar{display:flex;}
  .container{padding:0 24px;}
  .section{padding:64px 0;}
  .hero{padding:48px 0 40px;}
  .hero-grid{grid-template-columns:1fr;gap:32px;}
  .hero-copy,.hero-visual{grid-column:span 1;}
  .hero-visual::after{display:none;}
  .card-grid{grid-template-columns:repeat(2,1fr);}
  .card--feature{grid-column:span 1;}
  .card--feature .card-media img{aspect-ratio:16/10;}
  .assure-grid{grid-template-columns:repeat(2,1fr);}
  .assure-item{border-left:none;border-top:1px solid rgba(255,255,255,.14);padding:26px 22px;}
  .assure-item:nth-child(-n+2){border-top:none;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .news-grid{grid-template-columns:1fr;gap:0;}
  .news-item--lead{grid-column:span 1;}
}
@media (max-width:767px){
  .container{padding:0 18px;}
  .section{padding:56px 0;}
  .hero{padding:36px 0 32px;}
  .hero-sub{font-size:16px;}
  .hero-actions{gap:10px;}
  .hero-actions .btn{flex:1 1 150px;}
  .hero-stats{flex-direction:column;border-top:none;padding-top:0;margin-top:32px;}
  .hero-stat{padding:14px 0;border-top:1px solid var(--line);}
  .hero-stat + .hero-stat{border-left:none;padding-left:0;}
  .metrics-grid{grid-template-columns:repeat(2,1fr);}
  .metric{padding:18px;}
  .metric:nth-child(odd){border-left:none;}
  .metric:nth-child(n+3){border-top:1px solid var(--line);}
  .card-grid{grid-template-columns:1fr;}
  .review-track{grid-auto-columns:86%;}
  .assure-grid{grid-template-columns:1fr;}
  .assure-item{border-left:none;border-top:1px solid rgba(255,255,255,.14);}
  .assure-item:nth-child(-n+2){border-top:1px solid rgba(255,255,255,.14);}
  .assure-item:first-child{border-top:none;}
  .section-head{margin-bottom:28px;}
  .cta-inner{flex-direction:column;align-items:flex-start;}
  .cta-actions{width:100%;}
  .cta-actions .btn{flex:1 1 140px;}
  .footer{padding-top:48px;}
  .footer-grid{grid-template-columns:1fr;gap:28px;padding-bottom:36px;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
  .review-nav{justify-content:flex-start;}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms !important;transition-duration:.001ms !important;}
  .review-track{scroll-behavior:auto;}
}

/* roulang page: category1 */
:root{
    --ink:#16171A;
    --body:#3C3F45;
    --muted:#787B82;
    --accent:#C8502D;
    --accent-dark:#A8401F;
    --teal:#234A47;
    --gold:#B08A4F;
    --paper:#F5F2EC;
    --surface:#FFFFFF;
    --surface-2:#FBFAF7;
    --surface-3:#F0ECE3;
    --line:#E2DDD3;
    --danger:#B3261E;
    --success:#2E6B4F;
    --r-sm:2px;
    --r-md:4px;
    --shadow-hover:0 2px 8px rgba(22,23,26,.06);
    --shadow-pop:0 12px 32px rgba(22,23,26,.12);
    --ease:cubic-bezier(.22,.61,.36,1);
    --sidebar-w:248px;
    --container:1320px;
    --serif:"Noto Serif SC","Songti SC","Source Han Serif SC",serif;
    --sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
    --num:"Space Grotesk","Inter",-apple-system,"Segoe UI",sans-serif;
  }

  *,*::before,*::after{box-sizing:border-box;}
  html{-webkit-text-size-adjust:100%;}
  body{
    margin:0;
    font-family:var(--sans);
    font-size:16px;
    line-height:1.75;
    color:var(--body);
    background:var(--paper);
    -webkit-font-smoothing:antialiased;
  }
  h1,h2,h3,h4{margin:0;color:var(--ink);font-family:var(--serif);font-weight:600;letter-spacing:-.01em;}
  h2{font-size:clamp(24px,2.6vw,34px);line-height:1.32;}
  h3{font-size:20px;line-height:1.45;font-family:var(--sans);font-weight:500;}
  h4{font-size:17px;line-height:1.5;font-family:var(--sans);font-weight:500;}
  p{margin:0;}
  a{color:inherit;text-decoration:none;}
  img{max-width:100%;display:block;border-style:none;}
  ul,ol{margin:0;padding:0;list-style:none;}
  button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer;}
  input,select,textarea{font:inherit;color:inherit;}
  :focus-visible{outline:2px solid var(--accent);outline-offset:3px;}

  .container{width:100%;max-width:var(--container);margin:0 auto;padding:0 32px;}
  .section{padding:88px 0;}
  .section--tight{padding:64px 0;}
  .section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:36px;}
  .section-head p{color:var(--muted);font-size:15px;max-width:560px;margin-top:10px;}
  .eyebrow{
    display:inline-block;font-family:var(--num);font-size:12px;letter-spacing:.18em;
    text-transform:uppercase;color:var(--accent);margin-bottom:14px;font-weight:500;
  }

  /* ============ 布局 ============ */
  .layout{display:block;min-height:100vh;}
  .main-col{min-width:0;}

  /* ============ 侧栏 ============ */
  .sidebar{
    background:var(--surface-2);
    border-right:1px solid var(--line);
  }
  .sidebar-inner{
    display:flex;flex-direction:column;gap:0;
    padding:26px 20px 22px;height:100%;
  }
  .brand{display:block;padding:0 6px 22px;border-bottom:1px solid var(--line);}
  .brand-mark{
    display:block;font-family:var(--serif);font-size:22px;font-weight:700;
    color:var(--ink);letter-spacing:-.01em;line-height:1.2;
  }
  .brand-mark em{font-style:normal;color:var(--accent);}
  .brand-sub{
    display:block;margin-top:6px;font-size:11px;letter-spacing:.14em;
    color:var(--muted);font-family:var(--num);
  }
  .nav{display:flex;flex-direction:column;padding:18px 0 0;}
  .nav-link{
    position:relative;display:flex;align-items:center;justify-content:space-between;
    height:44px;padding:0 10px;border-radius:var(--r-sm);
    font-size:14px;color:var(--body);
    transition:background .18s var(--ease),color .18s var(--ease);
  }
  .nav-arrow{font-size:13px;color:#B4B0A6;transition:transform .18s var(--ease);}
  .nav-link:hover{background:var(--surface-3);color:var(--ink);}
  .nav-link:hover .nav-arrow{transform:translateX(2px);color:var(--accent);}
  .nav-link.is-active{background:var(--surface-3);color:var(--ink);font-weight:500;}
  .nav-link.is-active::before{
    content:"";position:absolute;left:-20px;top:8px;bottom:8px;width:2px;
    background:var(--accent);border-radius:2px;
  }
  .sidebar-divider{height:1px;background:var(--line);margin:18px 0;}
  .sidebar-cta{margin-top:auto;padding-top:20px;border-top:1px solid var(--line);}
  .sidebar-note{margin-top:12px;font-size:13px;line-height:1.6;color:var(--muted);}

  /* ============ 按钮 ============ */
  .btn{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    height:46px;padding:0 22px;border-radius:var(--r-sm);
    font-size:15px;font-weight:500;line-height:1;
    border:1px solid transparent;cursor:pointer;
    transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease);
  }
  .btn .btn-arrow{transition:transform .18s var(--ease);}
  .btn:hover .btn-arrow{transform:translateX(4px);}
  .btn-primary{background:var(--accent);color:#fff;}
  .btn-primary:hover{background:var(--accent-dark);color:#fff;}
  .btn-primary:active{transform:translateY(1px);}
  .btn-ghost{background:transparent;border-color:var(--ink);color:var(--ink);}
  .btn-ghost:hover{background:var(--ink);color:#fff;}
  .btn-light{background:#fff;border-color:var(--line);color:var(--ink);}
  .btn-light:hover{border-color:var(--accent);color:var(--accent);}
  .btn-on-dark{background:#fff;color:var(--teal);border-color:#fff;}
  .btn-on-dark:hover{background:var(--surface-3);color:var(--teal);}
  .btn-block{display:flex;width:100%;}

  .arrow-link{
    display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:500;
    color:var(--accent);letter-spacing:.01em;
  }
  .arrow-link span{transition:transform .18s var(--ease);}
  .arrow-link:hover span{transform:translateX(4px);}

  /* ============ 顶栏（移动端） ============ */
  .topbar{
    position:sticky;top:0;z-index:60;
    display:flex;align-items:center;justify-content:space-between;
    height:56px;padding:0 20px;background:var(--surface);
    border-bottom:1px solid var(--line);
  }
  .topbar-brand{font-family:var(--serif);font-size:18px;font-weight:700;color:var(--ink);}
  .topbar-brand span{font-family:var(--num);font-size:11px;color:var(--muted);margin-left:6px;letter-spacing:.1em;}
  .menu-btn{width:40px;height:40px;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:5px;}
  .menu-btn span{display:block;width:18px;height:2px;background:var(--ink);border-radius:2px;transition:transform .24s var(--ease),opacity .18s var(--ease);}
  .menu-btn[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg);}
  .menu-btn[aria-expanded="true"] span:nth-child(2){opacity:0;}
  .menu-btn[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}
  .scrim{
    position:fixed;inset:0;background:rgba(22,23,26,.42);z-index:70;
    opacity:0;pointer-events:none;transition:opacity .24s var(--ease);
  }
  .scrim.is-open{opacity:1;pointer-events:auto;}

  /* ============ 面包屑 ============ */
  .breadcrumb{
    display:flex;flex-wrap:wrap;align-items:center;gap:8px;
    font-size:12px;color:var(--muted);padding-top:34px;
  }
  .breadcrumb a:hover{color:var(--accent);}
  .breadcrumb .sep{color:#C7C2B7;}
  .breadcrumb .current{color:var(--ink);}

  /* ============ 分类头部 ============ */
  .cat-head{padding-bottom:44px;border-bottom:1px solid var(--line);}
  .cat-head h1{
    font-size:clamp(28px,3.8vw,46px);line-height:1.28;margin-bottom:18px;max-width:16em;
  }
  .cat-head h1 em{font-style:normal;color:var(--accent);}
  .cat-lead{max-width:660px;font-size:17px;line-height:1.8;color:var(--body);}
  .chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px;}
  .chip{
    display:inline-flex;align-items:center;height:34px;padding:0 16px;
    border:1px solid var(--line);border-radius:var(--r-sm);background:var(--surface);
    font-size:13px;color:var(--body);transition:all .18s var(--ease);
  }
  .chip:hover{border-color:var(--accent);color:var(--accent);}
  .chip.is-active{background:var(--ink);border-color:var(--ink);color:#fff;}

  /* ============ 双栏 ============ */
  .split{
    display:grid;grid-template-columns:minmax(0,2fr) minmax(0,1fr);
    gap:40px;align-items:start;
  }
  .entry-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;}
  .entry-card{
    display:flex;flex-direction:column;background:var(--surface);
    border:1px solid var(--line);border-radius:var(--r-md);overflow:hidden;
    transition:transform .24s var(--ease),border-color .24s var(--ease),box-shadow .24s var(--ease);
  }
  .entry-card:hover{transform:translateY(-3px);border-color:var(--accent);box-shadow:var(--shadow-hover);}
  .entry-thumb{
    position:relative;aspect-ratio:16/10;overflow:hidden;background:#EFEAE0;
  }
  .entry-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .32s var(--ease);}
  .entry-card:hover .entry-thumb img{transform:scale(1.04);}
  .entry-body{padding:20px 22px 22px;display:flex;flex-direction:column;gap:12px;flex:1;}
  .badge{
    display:inline-flex;align-items:center;height:22px;padding:0 9px;
    border-radius:var(--r-sm);background:var(--surface-3);color:var(--ink);
    font-size:12px;letter-spacing:.02em;width:fit-content;
  }
  .badge--line{background:transparent;border:1px solid var(--accent);color:var(--accent);}
  .entry-body h3{font-size:17px;font-weight:500;line-height:1.5;}
  .entry-body p{
    font-size:14px;line-height:1.7;color:var(--muted);
    display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
  }
  .entry-body .arrow-link{margin-top:auto;}

  /* ============ 侧栏信息条 ============ */
  .side-panel{
    position:sticky;top:32px;
    background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);
    padding:26px 24px;
  }
  .side-panel h2{font-size:19px;line-height:1.5;margin-bottom:6px;}
  .side-panel .side-sub{font-size:13px;color:var(--muted);margin-bottom:20px;}
  .check-list{display:flex;flex-direction:column;gap:14px;margin-bottom:24px;}
  .check-list li{display:flex;gap:10px;font-size:14px;line-height:1.7;color:var(--body);}
  .check-list li::before{
    content:"";flex:0 0 auto;width:6px;height:6px;margin-top:9px;
    background:var(--accent);border-radius:1px;
  }
  .side-panel .side-note{
    margin-top:14px;font-size:12px;line-height:1.7;color:var(--muted);
    padding-top:14px;border-top:1px solid var(--line);
  }

  /* ============ 步骤 ============ */
  .steps{
    display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:0;
    border-top:1px solid var(--line);
  }
  .steps li{
    padding:28px 24px 28px 0;border-right:1px solid var(--line);
  }
  .steps li:last-child{border-right:0;padding-right:0;}
  .step-no{
    display:block;font-family:var(--serif);font-size:34px;line-height:1;
    color:var(--accent);margin-bottom:14px;font-weight:600;
  }
  .steps h3{font-size:16px;margin-bottom:8px;}
  .steps p{font-size:14px;line-height:1.75;color:var(--muted);}

  /* ============ FAQ ============ */
  .faq-wrap{max-width:820px;}
  .faq{border-top:1px solid var(--line);}
  .faq details{border-bottom:1px solid var(--line);}
  .faq summary{
    display:flex;align-items:center;justify-content:space-between;gap:20px;
    padding:22px 0;font-size:16px;font-weight:500;color:var(--ink);
    cursor:pointer;list-style:none;
  }
  .faq summary::-webkit-details-marker{display:none;}
  .faq summary::after{
    content:"+";font-family:var(--num);font-size:20px;color:var(--accent);
    line-height:1;transition:transform .24s var(--ease);
  }
  .faq details[open] summary::after{content:"–";}
  .faq summary:hover{color:var(--accent);}
  .faq .faq-body{padding:0 0 24px;font-size:15px;line-height:1.85;color:var(--body);max-width:660px;}

  /* ============ 相关内容行式列表 ============ */
  .rel-list{border-top:1px solid var(--line);}
  .rel-list a{
    display:flex;align-items:center;gap:24px;
    padding:22px 0;border-bottom:1px solid var(--line);
    transition:padding-left .18s var(--ease),color .18s var(--ease);
  }
  .rel-list a:hover{padding-left:8px;color:var(--accent);}
  .rel-tag{
    flex:0 0 auto;font-family:var(--num);font-size:12px;letter-spacing:.1em;
    color:var(--gold);min-width:72px;
  }
  .rel-title{flex:1;font-size:16px;font-weight:500;color:var(--ink);}
  .rel-list a:hover .rel-title{color:var(--accent);}
  .rel-arrow{color:var(--muted);transition:transform .18s var(--ease);}
  .rel-list a:hover .rel-arrow{transform:translateX(4px);color:var(--accent);}

  /* ============ CTA ============ */
  .cta-banner{
    background:var(--teal);color:#fff;border-radius:var(--r-md);
    padding:52px 48px;display:flex;align-items:center;justify-content:space-between;
    gap:36px;flex-wrap:wrap;
  }
  .cta-banner h2{color:#fff;font-size:clamp(22px,2.4vw,30px);line-height:1.4;}
  .cta-banner p{color:rgba(255,255,255,.78);font-size:15px;margin-top:12px;max-width:520px;line-height:1.8;}

  /* ============ 页脚 ============ */
  .footer{background:var(--ink);color:#fff;padding:64px 0 0;margin-top:0;}
  .footer-grid{
    display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px;
    padding-bottom:48px;border-bottom:1px solid rgba(255,255,255,.14);
  }
  .footer-brand{font-family:var(--serif);font-size:20px;font-weight:700;color:#fff;}
  .footer-brand em{font-style:normal;color:#E9A17F;}
  .footer-tag{margin-top:12px;font-size:13px;line-height:1.8;color:rgba(255,255,255,.66);max-width:320px;}
  .footer-col h3{
    font-family:var(--sans);font-size:13px;font-weight:500;color:#fff;
    letter-spacing:.08em;margin-bottom:16px;
  }
  .footer-col a,.footer-col p{
    display:block;font-size:13px;line-height:1.9;color:rgba(255,255,255,.66);
    margin-bottom:8px;transition:color .18s var(--ease);
  }
  .footer-col a:hover{color:#fff;text-decoration:underline;text-underline-offset:3px;}
  .footer-bottom{
    display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;
    padding:22px 0 28px;font-size:12px;color:rgba(255,255,255,.5);
  }

  /* ============ 响应式 ============ */
  @media (min-width:1024px){
    .layout{display:grid;grid-template-columns:var(--sidebar-w) minmax(0,1fr);align-items:start;}
    .sidebar{position:sticky;top:0;height:100vh;overflow-y:auto;}
    .sidebar-inner{min-height:100%;}
    .topbar{display:none;}
    .scrim{display:none;}
    .main-col{min-width:0;}
    .container{padding:0 40px;}
  }
  @media (max-width:1023px){
    .sidebar{
      position:fixed;top:0;left:0;bottom:0;width:288px;z-index:80;
      transform:translateX(-100%);transition:transform .28s var(--ease);
      overflow-y:auto;display:flex;flex-direction:column;
    }
    .sidebar.is-open{transform:translateX(0);box-shadow:var(--shadow-pop);}
    .sidebar-inner{min-height:100%;}
    .nav-link.is-active::before{left:-20px;}
    .split{grid-template-columns:minmax(0,1fr);gap:32px;}
    .side-panel{position:static;}
    .steps{grid-template-columns:repeat(2,minmax(0,1fr));}
    .steps li:nth-child(2){border-right:0;padding-right:0;}
    .steps li:nth-child(n+3){border-top:1px solid var(--line);}
    .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  }
  @media (max-width:767px){
    .container{padding:0 20px;}
    .section{padding:56px 0;}
    .section--tight{padding:48px 0;}
    .entry-grid{grid-template-columns:minmax(0,1fr);}
    .cat-head{padding-bottom:32px;}
    .cat-lead{font-size:16px;}
    .steps{grid-template-columns:minmax(0,1fr);}
    .steps li{padding:24px 0;border-right:0;}
    .steps li+li{border-top:1px solid var(--line);}
    .cta-banner{padding:36px 24px;}
    .footer{padding-top:48px;}
    .section-head{flex-direction:column;align-items:flex-start;gap:12px;}
  }
  @media (max-width:519px){
    .chips{gap:8px;}
    .chip{font-size:12px;padding:0 12px;height:32px;}
    .footer-grid{grid-template-columns:minmax(0,1fr);}
    .rel-list a{gap:14px;align-items:flex-start;flex-wrap:wrap;}
    .rel-tag{min-width:0;}
    .footer-bottom{flex-direction:column;}
  }
  @media (prefers-reduced-motion:reduce){
    *{animation:none!important;transition:none!important;scroll-behavior:auto!important;}
  }

/* roulang page: article */
:root{
  --accent:#C8502D;
  --accent-dark:#A8401F;
  --accent-soft:#F7EBE6;
  --teal:#234A47;
  --gold:#B08A4F;
  --bg:#F5F2EC;
  --surface:#FFFFFF;
  --surface-2:#FBFAF7;
  --surface-3:#F0ECE3;
  --line:#E2DDD3;
  --line-strong:#D3CCC0;
  --text:#16171A;
  --text-2:#3C3F45;
  --muted:#787B82;
  --danger:#B3261E;
  --ok:#2E6B4F;
  --radius:4px;
  --radius-sm:2px;
  --shadow-hover:0 2px 8px rgba(22,23,26,.06);
  --shadow-float:0 12px 32px rgba(22,23,26,.12);
  --ease:cubic-bezier(.22,.61,.36,1);
  --sidebar-w:248px;
  --font-serif:"Noto Serif SC","Songti SC","STSong",serif;
  --font-sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-num:"Space Grotesk",Inter,-apple-system,BlinkMacSystemFont,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul,ol{margin:0}
h1,h2,h3,h4,p{margin:0}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px}
::selection{background:var(--accent);color:#fff}

/* ============ 布局骨架 ============ */
.main{
  margin-left:var(--sidebar-w);
  min-height:100vh;
  display:flex;
  flex-direction:column;
}
.page{
  width:100%;
  max-width:1160px;
  margin:0 auto;
  padding:44px 44px 88px;
  flex:1 0 auto;
}

/* ============ 左侧竖导航 ============ */
.sidebar{
  position:fixed;
  top:0;left:0;bottom:0;
  width:var(--sidebar-w);
  display:flex;
  flex-direction:column;
  padding:26px 18px 20px;
  background:var(--surface-2);
  border-right:1px solid var(--line);
  overflow-y:auto;
  z-index:60;
}
.brand{display:block;padding:0 6px}
.brand-mark{
  display:block;
  font-family:var(--font-serif);
  font-weight:700;
  font-size:22px;
  line-height:1.2;
  letter-spacing:-.01em;
  color:var(--text);
}
.brand-mark em{font-style:normal;color:var(--accent)}
.brand-sub{
  margin-top:7px;
  font-size:11px;
  letter-spacing:.18em;
  color:var(--muted);
  text-transform:uppercase;
}
.nav{
  margin-top:30px;
  display:flex;
  flex-direction:column;
  gap:2px;
}
.nav-link{
  position:relative;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:8px;
  min-height:44px;
  padding:0 12px;
  border-radius:var(--radius-sm);
  font-size:14px;
  color:var(--text-2);
  transition:background .16s var(--ease),color .16s var(--ease);
}
.nav-link:hover{background:var(--surface-3);color:var(--text)}
.nav-link.is-active{background:var(--surface-3);color:var(--text);font-weight:500}
.nav-link.is-active::before{
  content:"";
  position:absolute;
  left:0;top:9px;bottom:9px;
  width:2px;
  background:var(--accent);
  border-radius:2px;
}
.nav-arrow{font-size:14px;line-height:1;color:var(--muted);opacity:.75;transition:transform .16s var(--ease),color .16s var(--ease)}
.nav-link:hover .nav-arrow{color:var(--accent);transform:translateX(3px)}
.side-divider{height:1px;background:var(--line);margin:24px 6px 18px}
.side-note{padding:0 6px;font-size:13px;line-height:1.8;color:var(--muted)}
.side-cta{margin-top:auto;padding:24px 6px 0}
.side-cta .btn{width:100%}
.side-contact{margin-top:12px;font-size:12px;line-height:1.7;color:var(--muted)}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:46px;
  padding:0 22px;
  border-radius:var(--radius-sm);
  font-size:15px;
  font-weight:500;
  line-height:1;
  border:1px solid transparent;
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease);
}
.btn .arw{display:inline-block;transition:transform .18s var(--ease)}
.btn:hover .arw{transform:translateX(4px)}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-dark)}
.btn-primary:active{transform:translateY(1px)}
.btn-outline{border-color:var(--text);color:var(--text);background:transparent}
.btn-outline:hover{background:var(--text);color:#fff}
.btn-ghost{border-color:var(--line-strong);color:var(--text-2);background:var(--surface)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}
.btn[disabled],.btn.is-disabled{opacity:.45;pointer-events:none}
.link-more{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-size:14px;
  color:var(--accent);
  transition:color .18s var(--ease);
}
.link-more .arw{transition:transform .18s var(--ease)}
.link-more:hover{color:var(--accent-dark)}
.link-more:hover .arw{transform:translateX(4px)}

/* ============ 移动端顶栏 ============ */
.mobilebar{
  display:none;
  position:sticky;
  top:0;
  z-index:70;
  height:56px;
  align-items:center;
  justify-content:space-between;
  padding:0 18px;
  background:var(--surface);
  border-bottom:1px solid var(--line);
}
.mobilebar .brand-mark{font-size:19px}
.burger{
  width:40px;height:40px;
  display:flex;flex-direction:column;
  align-items:center;justify-content:center;
  gap:5px;
  border-radius:var(--radius-sm);
}
.burger span{
  display:block;
  width:18px;height:2px;
  background:var(--text);
  border-radius:2px;
  transition:transform .22s var(--ease),opacity .18s var(--ease);
}
.burger.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger.is-open span:nth-child(2){opacity:0}
.burger.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.drawer{
  position:fixed;
  inset:56px 0 0 0;
  background:var(--surface);
  z-index:65;
  display:flex;
  flex-direction:column;
  padding:8px 18px 0;
  transform:translateY(-8px);
  opacity:0;
  visibility:hidden;
  transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s;
  overflow-y:auto;
}
.drawer.is-open{opacity:1;visibility:visible;transform:translateY(0)}
.drawer-nav{display:flex;flex-direction:column}
.drawer-nav a{
  display:flex;
  align-items:center;
  justify-content:space-between;
  min-height:52px;
  font-size:16px;
  color:var(--text-2);
  border-bottom:1px solid var(--line);
}
.drawer-nav a.is-active{color:var(--accent);font-weight:500}
.drawer-nav a span{color:var(--muted)}
.drawer-cta{padding:20px 0 28px;margin-top:auto}

/* ============ 面包屑 ============ */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-size:12px;
  color:var(--muted);
  margin-bottom:30px;
}
.breadcrumb a{transition:color .16s var(--ease)}
.breadcrumb a:hover{color:var(--accent)}
.breadcrumb .sep{color:var(--line-strong)}
.breadcrumb .current{color:var(--text)}

/* ============ 文章头 ============ */
.read-grid{
  display:grid;
  grid-template-columns:minmax(0,720px) 240px;
  gap:64px;
  align-items:start;
}
.meta-row{
  display:flex;
  align-items:center;
  gap:14px;
  flex-wrap:wrap;
  margin-bottom:18px;
}
.badge{
  display:inline-flex;
  align-items:center;
  height:22px;
  padding:0 9px;
  border-radius:var(--radius-sm);
  background:var(--surface-3);
  color:var(--text);
  font-size:12px;
  letter-spacing:.02em;
  white-space:nowrap;
}
.badge-line{
  background:transparent;
  border:1px solid var(--accent);
  color:var(--accent);
}
.meta-time{font-family:var(--font-num);font-size:13px;color:var(--muted);letter-spacing:.01em}
.article-head h1{
  font-family:var(--font-serif);
  font-weight:700;
  font-size:clamp(28px,3.6vw,42px);
  line-height:1.35;
  letter-spacing:-.01em;
  color:var(--text);
  margin-bottom:22px;
}
.lead{
  margin-bottom:38px;
  padding-left:18px;
  border-left:3px solid var(--accent);
  font-size:17px;
  line-height:1.85;
  color:var(--text-2);
}

/* ============ 正文 ============ */
.article-body{
  font-size:17px;
  line-height:1.9;
  color:var(--text-2);
  word-break:break-word;
}
.article-body p{margin:0 0 1.4em}
.article-body h2{
  font-family:var(--font-serif);
  font-size:24px;
  font-weight:600;
  line-height:1.45;
  color:var(--text);
  margin:40px 0 16px;
  scroll-margin-top:88px;
}
.article-body h3{
  font-size:20px;
  font-weight:500;
  line-height:1.5;
  color:var(--text);
  margin:32px 0 12px;
  scroll-margin-top:88px;
}
.article-body h4{font-size:17px;font-weight:500;color:var(--text);margin:24px 0 10px}
.article-body ul,.article-body ol{padding-left:22px;margin:0 0 1.4em}
.article-body li{margin:.42em 0}
.article-body li::marker{color:var(--accent)}
.article-body blockquote{
  margin:28px 0;
  padding:18px 22px;
  background:var(--surface-3);
  border-left:3px solid var(--accent);
  border-radius:var(--radius);
  color:var(--text-2);
}
.article-body blockquote p:last-child{margin-bottom:0}
.article-body img{
  margin:28px auto;
  border-radius:var(--radius);
  border:1px solid var(--line);
}
.article-body a{color:var(--accent);border-bottom:1px solid rgba(200,80,45,.35)}
.article-body a:hover{color:var(--accent-dark);border-bottom-color:var(--accent-dark)}
.article-body strong{color:var(--text);font-weight:600}
.article-body table{
  width:100%;
  border-collapse:collapse;
  margin:24px 0;
  font-size:15px;
}
.article-body th,.article-body td{
  border:1px solid var(--line);
  padding:10px 14px;
  text-align:left;
}
.article-body th{background:var(--surface-3);color:var(--text);font-weight:500}
.article-body hr{border:0;border-top:1px solid var(--line);margin:36px 0}

/* ============ 目录 ============ */
.toc{position:sticky;top:36px}
.toc-title{
  font-size:12px;
  letter-spacing:.18em;
  color:var(--muted);
  text-transform:uppercase;
  margin-bottom:14px;
}
.toc-list{
  list-style:none;
  padding:0;
  margin:0;
  border-left:1px solid var(--line);
}
.toc-list a{
  display:block;
  margin-left:-1px;
  padding:7px 0 7px 14px;
  border-left:2px solid transparent;
  font-size:13px;
  line-height:1.55;
  color:var(--muted);
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.toc-list a:hover{color:var(--text)}
.toc-list a.is-current{color:var(--text);border-left-color:var(--accent);font-weight:500}
.toc-list a.lvl-3{padding-left:26px;font-size:12.5px}

/* ============ 标签 / 空态 ============ */
.tag-row{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:46px;
  padding-top:28px;
  border-top:1px solid var(--line);
}
.tag{
  display:inline-flex;
  align-items:center;
  height:26px;
  padding:0 12px;
  border:1px solid var(--line-strong);
  border-radius:var(--radius-sm);
  font-size:12.5px;
  color:var(--text-2);
  transition:border-color .16s var(--ease),color .16s var(--ease);
}
.tag:hover{border-color:var(--accent);color:var(--accent)}
.empty-state{
  padding:52px 24px;
  text-align:center;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius);
}
.empty-state p{font-size:15px;color:var(--muted);margin-bottom:18px}

/* ============ 相关推荐 ============ */
.related{margin-top:64px}
.related-head{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:16px;
  padding-bottom:16px;
  border-bottom:1px solid var(--line);
  margin-bottom:8px;
}
.related-head h2{
  font-family:var(--font-serif);
  font-size:22px;
  font-weight:600;
  color:var(--text);
}
.related-list{display:flex;flex-direction:column}
.rel-item{
  display:grid;
  grid-template-columns:88px minmax(0,1fr) auto;
  gap:18px;
  align-items:center;
  padding:18px 0;
  border-bottom:1px solid var(--line);
  transition:padding-left .2s var(--ease);
}
.rel-item:hover{padding-left:6px}
.rel-thumb{
  width:88px;height:66px;
  border-radius:var(--radius);
  border:1px solid var(--line);
  overflow:hidden;
  background:#EFEAE0;
}
.rel-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .32s var(--ease)}
.rel-item:hover .rel-thumb img{transform:scale(1.05)}
.rel-title{
  font-size:16px;
  font-weight:500;
  line-height:1.55;
  color:var(--text);
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
}
.rel-item:hover .rel-title{color:var(--accent)}
.rel-meta{font-family:var(--font-num);font-size:12px;color:var(--muted);margin-top:6px}
.rel-arrow{color:var(--line-strong);font-size:18px;line-height:1;transition:color .18s var(--ease),transform .18s var(--ease)}
.rel-item:hover .rel-arrow{color:var(--accent);transform:translateX(4px)}
.related-foot{margin-top:28px}

/* ============ 页脚 ============ */
.footer{
  background:var(--text);
  color:#EDEAE5;
  padding:60px 0 26px;
  font-size:13px;
  flex-shrink:0;
}
.footer .container{width:100%;max-width:1160px;margin:0 auto;padding:0 44px}
.footer-grid{
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr 1.2fr;
  gap:40px;
  padding-bottom:40px;
  border-bottom:1px solid rgba(255,255,255,.14);
}
.footer-brand{
  font-family:var(--font-serif);
  font-size:20px;
  font-weight:700;
  color:#fff;
  letter-spacing:-.01em;
}
.footer-brand em{font-style:normal;color:#E08B6B}
.footer-tag{
  margin-top:12px;
  max-width:320px;
  font-size:13px;
  line-height:1.85;
  color:rgba(255,255,255,.62);
}
.footer-col h3{
  font-size:13px;
  font-weight:500;
  color:#fff;
  margin-bottom:14px;
  letter-spacing:.04em;
}
.footer-col a,.footer-col p{
  display:block;
  font-size:13px;
  line-height:1.9;
  color:rgba(255,255,255,.62);
  transition:color .16s var(--ease);
}
.footer-col a:hover{color:#fff;text-decoration:underline;text-underline-offset:3px}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  padding-top:22px;
  font-size:12.5px;
  color:rgba(255,255,255,.5);
}

/* ============ 响应式 ============ */
@media (max-width:1199px){
  .read-grid{grid-template-columns:minmax(0,1fr);gap:0}
  .toc{display:none}
  .page{padding:40px 36px 76px}
}
@media (max-width:1023px){
  .sidebar{display:none}
  .main{margin-left:0}
  .mobilebar{display:flex}
  .page{padding:32px 24px 64px;max-width:860px}
  .footer .container{padding:0 24px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
}
@media (max-width:767px){
  .page{padding:24px 18px 52px}
  .article-head h1{font-size:clamp(26px,7vw,32px)}
  .lead{font-size:16px;padding-left:14px;margin-bottom:30px}
  .article-body{font-size:16px;line-height:1.85}
  .article-body h2{font-size:21px;margin-top:34px}
  .article-body h3{font-size:18px}
  .rel-item{grid-template-columns:72px minmax(0,1fr) auto;gap:14px}
  .rel-thumb{width:72px;height:56px}
  .rel-title{font-size:15px}
  .footer{padding:44px 0 22px}
  .footer .container{padding:0 18px}
  .footer-grid{grid-template-columns:1fr;gap:26px}
  .footer-tag{max-width:none}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}
@media (max-width:520px){
  .related-head{flex-direction:column;align-items:flex-start;gap:6px}
  .rel-item{grid-template-columns:64px minmax(0,1fr);gap:12px}
  .rel-thumb{width:64px;height:50px}
  .rel-arrow{display:none}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms !important;transition-duration:.001ms !important;scroll-behavior:auto !important}
}

/* roulang page: category2 */
:root{
  --terracotta:#C8502D;
  --terracotta-dark:#A8401F;
  --celadon:#234A47;
  --celadon-soft:#2E5B57;
  --bronze:#B08A4F;
  --paper:#F5F2EC;
  --surface:#FFFFFF;
  --surface-2:#FBFAF7;
  --surface-3:#F0ECE3;
  --ink:#16171A;
  --body:#3C3F45;
  --muted:#787B82;
  --line:#E2DDD3;
  --line-strong:#CFC8BA;
  --err:#B3261E;
  --ok:#2E6B4F;
  --r-sm:2px;
  --r-md:4px;
  --shadow-hover:0 2px 8px rgba(22,23,26,.06);
  --shadow-float:0 12px 32px rgba(22,23,26,.12);
  --ease:cubic-bezier(.22,.61,.36,1);
  --sidebar:248px;
  --font-serif:"Noto Serif SC",Georgia,"Songti SC",serif;
  --font-sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-num:"Space Grotesk","Inter",system-ui,sans-serif;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  color:var(--body);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;transition:color .16s var(--ease);}
button{font-family:inherit;border:0;background:none;cursor:pointer;color:inherit;}
h1,h2,h3,h4{margin:0;color:var(--ink);font-family:var(--font-serif);font-weight:700;letter-spacing:-.01em;line-height:1.3;}
p{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
:focus-visible{outline:2px solid var(--terracotta);outline-offset:3px;border-radius:2px;}

.container{width:100%;max-width:1180px;margin:0 auto;padding:0 40px;}

/* ============ layout ============ */
.layout{display:flex;align-items:stretch;min-height:100vh;}
.sidebar{
  width:var(--sidebar);
  flex:0 0 var(--sidebar);
  position:sticky;
  top:0;
  height:100vh;
  overflow-y:auto;
  background:var(--surface-2);
  border-right:1px solid var(--line);
  padding:28px 18px 24px;
  display:flex;
  flex-direction:column;
}
.content{flex:1;min-width:0;display:flex;flex-direction:column;}
main{flex:1;}

/* ============ brand ============ */
.brand{padding:0 6px 22px;border-bottom:1px solid var(--line);}
.brand-mark{
  display:inline-block;
  font-family:var(--font-serif);
  font-size:22px;
  font-weight:700;
  color:var(--ink);
  letter-spacing:-.01em;
  line-height:1.25;
}
.brand-mark span{color:var(--terracotta);}
.brand-mark:hover{color:var(--terracotta-dark);}
.brand-sub{
  margin-top:6px;
  font-size:11px;
  letter-spacing:.16em;
  color:var(--muted);
  text-transform:uppercase;
  font-family:var(--font-num);
}

/* ============ side nav ============ */
.nav{margin-top:18px;display:flex;flex-direction:column;gap:2px;}
.nav-link{
  display:flex;
  align-items:center;
  justify-content:space-between;
  height:44px;
  padding:0 12px;
  font-size:14px;
  color:var(--body);
  border-left:2px solid transparent;
  border-radius:0 var(--r-sm) var(--r-sm) 0;
  transition:background .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease);
}
.nav-link:hover{background:var(--surface-3);}
.nav-link.is-active{
  background:var(--surface-3);
  border-left-color:var(--terracotta);
  color:var(--ink);
  font-weight:500;
}
.nav-arrow{font-size:14px;color:#A9A49A;transition:transform .16s var(--ease),color .16s var(--ease);font-family:var(--font-num);}
.nav-link:hover .nav-arrow,.nav-link.is-active .nav-arrow{color:var(--terracotta);transform:translateX(2px);}

.side-foot{margin-top:auto;padding:20px 6px 0;border-top:1px solid var(--line);}
.side-note{margin-top:12px;font-size:13px;line-height:1.7;color:var(--muted);}

/* ============ buttons ============ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:46px;
  padding:0 22px;
  font-size:15px;
  font-weight:500;
  border-radius:var(--r-sm);
  border:1px solid transparent;
  transition:background .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease),transform .16s var(--ease);
  white-space:nowrap;
}
.btn-primary{background:var(--terracotta);color:#fff;border-color:var(--terracotta);}
.btn-primary:hover{background:var(--terracotta-dark);border-color:var(--terracotta-dark);}
.btn-primary:active{transform:translateY(1px);}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--ink);}
.btn-ghost:hover{background:var(--ink);color:#fff;}
.btn-light{background:#fff;color:var(--ink);border-color:#fff;}
.btn-light:hover{background:var(--surface-3);border-color:var(--surface-3);}
.btn-outline-light{background:transparent;color:#fff;border-color:rgba(255,255,255,.55);}
.btn-outline-light:hover{background:rgba(255,255,255,.12);border-color:#fff;}
.btn-block{width:100%;}
.btn .arrow{font-family:var(--font-num);transition:transform .16s var(--ease);}
.btn:hover .arrow{transform:translateX(4px);}

.textlink{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:14px;
  font-weight:500;
  color:var(--terracotta);
}
.textlink .arrow{font-family:var(--font-num);transition:transform .16s var(--ease);}
.textlink:hover{color:var(--terracotta-dark);}
.textlink:hover .arrow{transform:translateX(4px);}

/* ============ topbar (mobile) ============ */
.topbar{
  display:none;
  position:sticky;
  top:0;
  z-index:60;
  align-items:center;
  justify-content:space-between;
  height:56px;
  padding:0 20px;
  background:#fff;
  border-bottom:1px solid var(--line);
}
.topbar .brand-mark{font-size:18px;}
.burger{
  width:40px;height:40px;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;
  border-radius:var(--r-sm);
}
.burger span{display:block;width:18px;height:2px;background:var(--ink);transition:transform .24s var(--ease),opacity .16s var(--ease);}
.burger.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.burger.is-open span:nth-child(2){opacity:0;}
.burger.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

.drawer{
  display:none;
  position:fixed;
  inset:0;
  z-index:80;
  background:#fff;
  flex-direction:column;
  padding:0 0 24px;
}
.drawer.is-open{display:flex;}
.drawer-head{
  display:flex;align-items:center;justify-content:space-between;
  height:56px;padding:0 20px;border-bottom:1px solid var(--line);
}
.drawer-list{flex:1;overflow-y:auto;}
.drawer-link{
  display:flex;align-items:center;justify-content:space-between;
  padding:0 20px;height:52px;font-size:16px;color:var(--ink);
  border-bottom:1px solid var(--line);
}
.drawer-link span{color:var(--muted);font-family:var(--font-num);}
.drawer-link.is-active{color:var(--terracotta);font-weight:500;border-left:2px solid var(--terracotta);}
.drawer-foot{padding:16px 20px 0;}

/* ============ page head ============ */
.page-head{
  position:relative;
  overflow:hidden;
  background:linear-gradient(180deg,var(--surface-2) 0%,var(--paper) 100%);
  border-bottom:1px solid var(--line);
  padding:36px 0 56px;
}
.page-head::after{
  content:"";
  position:absolute;
  top:-140px;right:-120px;
  width:420px;height:420px;
  border-radius:50%;
  background:radial-gradient(circle,rgba(200,80,45,.13),rgba(176,138,79,.07) 55%,transparent 72%);
  pointer-events:none;
}
.breadcrumb{
  display:flex;align-items:center;gap:8px;
  font-size:12px;color:var(--muted);
  font-family:var(--font-num);
  letter-spacing:.02em;
}
.breadcrumb a:hover{color:var(--terracotta);}
.breadcrumb .current{color:var(--ink);}
.breadcrumb .sep{color:#C4BEB2;}

.head-grid{
  display:grid;
  grid-template-columns:minmax(0,7fr) minmax(0,5fr);
  gap:56px;
  align-items:center;
  margin-top:26px;
  position:relative;
  z-index:1;
}
.eyebrow{
  display:inline-block;
  font-size:12px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--bronze);
  font-family:var(--font-num);
  font-weight:500;
}
.head-grid h1{
  margin-top:14px;
  font-size:clamp(28px,3.4vw,42px);
  line-height:1.26;
}
.head-lead{
  margin-top:16px;
  font-size:16px;
  line-height:1.8;
  color:var(--body);
  max-width:44ch;
}
.chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px;}
.chip{
  display:inline-flex;align-items:center;
  height:34px;padding:0 16px;
  font-size:13px;
  border:1px solid var(--line-strong);
  border-radius:var(--r-sm);
  color:var(--body);
  background:#fff;
  transition:border-color .16s var(--ease),color .16s var(--ease),background .16s var(--ease);
}
.chip:hover{border-color:var(--terracotta);color:var(--terracotta);}
.chip.is-active{background:var(--ink);border-color:var(--ink);color:#fff;}

.head-media{position:relative;}
.head-media .frame{
  aspect-ratio:4/3;
  border-radius:var(--r-md);
  border:1px solid var(--line);
  overflow:hidden;
  background:#EFEAE0;
  box-shadow:var(--shadow-hover);
}
.head-media .frame img{width:100%;height:100%;object-fit:cover;}
.head-media .accent-block{
  position:absolute;
  left:-18px;bottom:-18px;
  width:92px;height:92px;
  background:var(--terracotta);
  border-radius:var(--r-sm);
  z-index:-1;
}
.head-badge{
  position:absolute;
  left:16px;top:16px;
  display:inline-flex;align-items:center;gap:6px;
  height:26px;padding:0 12px;
  background:rgba(255,255,255,.94);
  border:1px solid var(--line);
  border-radius:var(--r-sm);
  font-size:12px;
  color:var(--ink);
  font-family:var(--font-num);
  letter-spacing:.04em;
}

/* ============ stats strip ============ */
.stat-strip{border-bottom:1px solid var(--line);background:var(--surface);}
.stat-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  height:72px;
  align-items:center;
}
.stat-item{
  display:flex;align-items:baseline;gap:10px;
  padding:0 20px;
  border-left:1px solid var(--line);
  min-width:0;
}
.stat-item:first-child{border-left:0;padding-left:0;}
.stat-num{font-family:var(--font-num);font-size:19px;font-weight:700;color:var(--terracotta);white-space:nowrap;}
.stat-label{font-size:13px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}

/* ============ section ============ */
.section{padding:88px 0;}
.section--tight{padding:64px 0;}
.section-head{max-width:720px;margin-bottom:44px;}
.section-head h2{margin-top:12px;font-size:clamp(24px,2.6vw,32px);}
.section-head p{margin-top:14px;font-size:16px;color:var(--body);line-height:1.8;}

/* ============ feature rows ============ */
.feature{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:64px;
  align-items:center;
  padding:56px 0;
  border-top:1px solid var(--line);
}
.feature:first-of-type{border-top:0;padding-top:0;}
.feature--reverse .feature-media{order:2;}
.feature-media{position:relative;}
.feature-media .frame{
  aspect-ratio:16/11;
  border-radius:var(--r-md);
  border:1px solid var(--line);
  overflow:hidden;
  background:#EFEAE0;
}
.feature-media .frame img{width:100%;height:100%;object-fit:cover;transition:transform .32s var(--ease);}
.feature:hover .frame img{transform:scale(1.04);}
.feature-tag{
  position:absolute;
  right:14px;bottom:14px;
  display:inline-flex;align-items:center;
  height:24px;padding:0 10px;
  font-size:12px;
  background:rgba(22,23,26,.82);
  color:#fff;
  border-radius:var(--r-sm);
  font-family:var(--font-num);
  letter-spacing:.04em;
}
.feature-body h2{font-size:clamp(21px,2.1vw,28px);}
.feature-body p{margin-top:14px;font-size:16px;line-height:1.85;color:var(--body);max-width:52ch;}
.feature-body .textlink{margin-top:20px;}
.feature-kicker{
  display:inline-block;
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.18em;
  color:var(--bronze);
  margin-bottom:10px;
}

/* ============ checklist ============ */
.checklist-panel{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r-md);
  padding:8px 32px;
}
.checklist{display:grid;grid-template-columns:1fr 1fr;gap:0 48px;}
.check-item{
  display:flex;gap:14px;
  padding:22px 0;
  border-bottom:1px solid var(--line);
}
.checklist > .check-item:nth-last-child(-n+2){border-bottom:0;}
.check-icon{
  flex:0 0 22px;
  width:22px;height:22px;
  margin-top:3px;
  border:1px solid var(--bronze);
  border-radius:var(--r-sm);
  display:flex;align-items:center;justify-content:center;
  color:var(--terracotta);
  font-size:12px;
  font-family:var(--font-num);
}
.check-item h3{font-family:var(--font-sans);font-size:15px;font-weight:500;color:var(--ink);letter-spacing:0;line-height:1.6;}
.check-item p{margin-top:4px;font-size:14px;color:var(--muted);line-height:1.7;}

/* ============ faq ============ */
.faq-wrap{max-width:840px;}
.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:24px;
  padding:22px 0;
  font-size:16px;
  font-weight:500;
  color:var(--ink);
  cursor:pointer;
  list-style:none;
  transition:color .16s var(--ease);
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary:hover{color:var(--terracotta);}
.faq-mark{
  flex:0 0 24px;
  width:24px;height:24px;
  position:relative;
  border:1px solid var(--line-strong);
  border-radius:var(--r-sm);
  transition:border-color .16s var(--ease),background .16s var(--ease);
  margin-top:1px;
}
.faq-mark::before,
.faq-mark::after{
  content:"";
  position:absolute;
  background:var(--ink);
  transition:transform .24s var(--ease),background .16s var(--ease);
}
.faq-mark::before{width:10px;height:1.5px;top:50%;left:50%;transform:translate(-50%,-50%);}
.faq-mark::after{width:1.5px;height:10px;top:50%;left:50%;transform:translate(-50%,-50%);}
.faq-item[open] .faq-mark{border-color:var(--terracotta);background:var(--surface-3);}
.faq-item[open] .faq-mark::before,
.faq-item[open] .faq-mark::after{background:var(--terracotta);}
.faq-item[open] .faq-mark::after{transform:translate(-50%,-50%) rotate(90deg);}
.faq-answer{padding:0 48px 24px 0;font-size:15px;line-height:1.85;color:var(--body);}

/* ============ related ============ */
.related{padding:0 0 88px;}
.related h2{font-size:clamp(20px,2vw,26px);margin-bottom:6px;}
.rel-list{border-top:1px solid var(--line);margin-top:24px;}
.rel-item{
  display:flex;align-items:center;justify-content:space-between;gap:32px;
  padding:22px 0;
  border-bottom:1px solid var(--line);
  transition:padding-left .16s var(--ease);
}
.rel-item:hover{padding-left:8px;}
.rel-item h3{font-family:var(--font-sans);font-size:16px;font-weight:500;color:var(--ink);letter-spacing:0;transition:color .16s var(--ease);}
.rel-item:hover h3{color:var(--terracotta);}
.rel-item p{margin-top:4px;font-size:14px;color:var(--muted);max-width:62ch;}
.rel-arrow{font-family:var(--font-num);color:var(--terracotta);transition:transform .16s var(--ease);}
.rel-item:hover .rel-arrow{transform:translateX(4px);}

/* ============ cta band ============ */
.cta-band{background:var(--celadon);color:#fff;padding:64px 0;}
.cta-inner{
  display:flex;align-items:center;justify-content:space-between;gap:48px;flex-wrap:wrap;
}
.cta-inner h2{color:#fff;font-size:clamp(22px,2.4vw,30px);max-width:22ch;}
.cta-inner p{margin-top:12px;font-size:15px;color:rgba(255,255,255,.78);max-width:52ch;line-height:1.8;}
.cta-actions{display:flex;gap:12px;flex-wrap:wrap;}

/* ============ footer ============ */
.footer{background:var(--ink);color:#fff;padding:64px 0 28px;font-size:13px;line-height:1.8;}
.footer-grid{
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr 1.1fr;
  gap:40px;
}
.footer-brand{font-family:var(--font-serif);font-size:20px;font-weight:700;color:#fff;}
.footer-brand em{font-style:normal;color:#E08A6B;}
.footer-tag{margin-top:12px;color:rgba(255,255,255,.66);max-width:30ch;}
.footer-col h3{
  font-family:var(--font-sans);
  font-size:13px;
  font-weight:500;
  color:#fff;
  letter-spacing:.06em;
  margin-bottom:14px;
}
.footer-col a,.footer-col p{display:block;color:rgba(255,255,255,.66);margin-bottom:8px;font-size:13px;}
.footer-col a:hover{color:#fff;text-decoration:underline;text-underline-offset:3px;}
.footer-bottom{
  margin-top:44px;
  padding-top:22px;
  border-top:1px solid rgba(255,255,255,.14);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  color:rgba(255,255,255,.5);
  font-size:12px;
}

/* ============ responsive ============ */
@media (max-width:1199px){
  .container{padding:0 32px;}
  .head-grid{gap:40px;}
  .feature{gap:44px;}
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr;gap:32px;}
  .footer-grid > div:last-child{grid-column:1 / -1;}
}
@media (max-width:1023px){
  .sidebar{display:none;}
  .topbar{display:flex;}
  .page-head{padding:24px 0 44px;}
  .head-grid{grid-template-columns:1fr;gap:32px;}
  .head-media{max-width:520px;}
  .head-media .accent-block{left:-12px;bottom:-12px;width:64px;height:64px;}
  .stat-grid{grid-template-columns:repeat(2,1fr);height:auto;padding:8px 0;}
  .stat-item{padding:14px 16px;border-left:0;border-top:1px solid var(--line);}
  .stat-item:nth-child(-n+2){border-top:0;}
  .stat-item:first-child{padding-left:16px;}
  .stat-label{white-space:normal;}
}
@media (max-width:767px){
  .container{padding:0 20px;}
  .section{padding:56px 0;}
  .section--tight{padding:44px 0;}
  .section-head{margin-bottom:32px;}
  .feature{grid-template-columns:1fr;gap:24px;padding:40px 0;}
  .feature--reverse .feature-media{order:0;}
  .feature-body p{font-size:15px;}
  .checklist{grid-template-columns:1fr;}
  .checklist-panel{padding:4px 20px;}
  .checklist > .check-item:nth-last-child(-n+2){border-bottom:1px solid var(--line);}
  .checklist > .check-item:last-child{border-bottom:0;}
  .faq-item summary{font-size:15px;gap:16px;}
  .faq-answer{padding-right:0;}
  .rel-item{flex-direction:column;align-items:flex-start;gap:6px;}
  .rel-arrow{display:none;}
  .cta-band{padding:44px 0;}
  .cta-inner{gap:24px;}
  .cta-actions{width:100%;}
  .cta-actions .btn{flex:1;}
  .footer{padding:44px 0 24px;}
  .footer-grid{grid-template-columns:1fr;gap:28px;}
  .footer-grid > div:last-child{grid-column:auto;}
  .footer-bottom{flex-direction:column;gap:8px;}
}
@media (max-width:520px){
  .head-grid h1{font-size:26px;}
  .chips{gap:8px;}
  .chip{height:32px;padding:0 12px;font-size:12px;}
  .stat-item{padding:12px 12px;gap:8px;}
  .stat-num{font-size:17px;}
  .btn{height:44px;padding:0 18px;font-size:14px;}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important;scroll-behavior:auto !important;}
}

/* roulang page: category3 */
:root{
  --accent:#C8502D;
  --accent-dark:#A8401F;
  --teal:#234A47;
  --teal-deep:#1B3B38;
  --brass:#B08A4F;
  --bg:#F5F2EC;
  --surface:#FFFFFF;
  --surface-2:#FBFAF7;
  --surface-3:#F0ECE3;
  --ink:#16171A;
  --text:#3C3F45;
  --muted:#787B82;
  --line:#E2DDD3;
  --danger:#B3261E;
  --success:#2E6B4F;
  --radius:4px;
  --radius-sm:2px;
  --shadow-hover:0 2px 8px rgba(22,23,26,.06);
  --shadow-float:0 12px 32px rgba(22,23,26,.12);
  --ease:cubic-bezier(.22,.61,.36,1);
  --sidebar-w:248px;
  --font-serif:"Noto Serif SC","Songti SC","Source Han Serif SC",serif;
  --font-sans:"Noto Sans SC","PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  --font-num:"Space Grotesk","Inter","Helvetica Neue",Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
button{font-family:inherit;font-size:inherit;color:inherit;background:none;border:0;cursor:pointer}
input,textarea,select{font-family:inherit;font-size:inherit}
h1,h2,h3,h4{margin:0;color:var(--ink);font-family:var(--font-serif);font-weight:600;letter-spacing:-.01em}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
figure{margin:0}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--radius-sm)}

/* ---------- 布局骨架 ---------- */
.layout{display:flex;align-items:flex-start;min-height:100vh}
.main{flex:1 1 auto;min-width:0}
.container{width:100%;max-width:1240px;margin:0 auto;padding:0 40px}
.section{padding:96px 0}
.section--tight{padding:64px 0}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:40px}
.section-head h2{font-size:clamp(24px,2.6vw,34px);line-height:1.3}
.eyebrow{
  display:inline-block;
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--accent);
  margin-bottom:14px;
}
.lead{font-size:17px;line-height:1.8;color:var(--text)}

/* ---------- 侧栏 ---------- */
.sidebar{
  flex:0 0 var(--sidebar-w);
  width:var(--sidebar-w);
  position:sticky;
  top:0;
  height:100vh;
  background:var(--surface-2);
  border-right:1px solid var(--line);
  z-index:900;
}
.sidebar-inner{
  height:100%;
  overflow-y:auto;
  display:flex;
  flex-direction:column;
  padding:32px 0 24px;
}
.brand{display:block;padding:0 20px 24px;border-bottom:1px solid var(--line);margin-bottom:16px}
.brand-mark{
  display:block;
  font-family:var(--font-serif);
  font-size:22px;
  font-weight:700;
  letter-spacing:-.01em;
  color:var(--ink);
  line-height:1.2;
}
.brand-sub{
  display:block;
  margin-top:6px;
  font-size:11px;
  letter-spacing:.14em;
  color:var(--muted);
}
.nav{display:flex;flex-direction:column;padding:0 8px}
.nav-link{
  display:flex;
  align-items:center;
  justify-content:space-between;
  height:44px;
  padding:0 12px;
  border-left:2px solid transparent;
  font-size:14px;
  color:var(--text);
  transition:background .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease);
}
.nav-link:hover{background:var(--surface-3);color:var(--ink)}
.nav-link.is-active{
  background:var(--surface-3);
  color:var(--ink);
  font-weight:500;
  border-left-color:var(--accent);
}
.nav-arrow{font-size:14px;color:var(--muted);transition:transform .16s var(--ease)}
.nav-link:hover .nav-arrow{transform:translateX(3px)}
.sidebar-foot{margin-top:auto;padding:24px 20px 0;border-top:1px solid var(--line)}
.sidebar-contact{font-size:13px;color:var(--muted);margin-top:12px;line-height:1.6}

/* ---------- 移动端顶栏 ---------- */
.topbar{
  display:none;
  position:sticky;
  top:0;
  z-index:950;
  height:56px;
  padding:0 16px;
  align-items:center;
  justify-content:space-between;
  background:var(--surface);
  border-bottom:1px solid var(--line);
}
.topbar-brand{font-family:var(--font-serif);font-weight:700;font-size:18px;color:var(--ink);line-height:1}
.topbar-brand span{font-family:var(--font-sans);font-size:11px;font-weight:400;color:var(--muted);margin-left:6px;letter-spacing:.1em}
.hamburger{
  width:40px;height:40px;
  display:flex;flex-direction:column;justify-content:center;align-items:center;gap:5px;
  border-radius:var(--radius-sm);
}
.hamburger span{
  display:block;width:18px;height:1.5px;background:var(--ink);
  transition:transform .24s var(--ease),opacity .16s var(--ease);
}
body.nav-open .hamburger span:nth-child(1){transform:translateY(6.5px) rotate(45deg)}
body.nav-open .hamburger span:nth-child(2){opacity:0}
body.nav-open .hamburger span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:46px;
  padding:0 22px;
  border-radius:var(--radius-sm);
  font-size:15px;
  font-weight:500;
  line-height:1;
  border:1px solid transparent;
  transition:background .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease),transform .16s var(--ease);
}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-dark)}
.btn-primary:active{transform:translateY(1px)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--ink)}
.btn-ghost:hover{background:var(--ink);color:#fff}
.btn-light{background:#fff;color:var(--teal)}
.btn-light:hover{background:#F0ECE3}
.btn-block{width:100%}
.btn .arrow{transition:transform .16s var(--ease)}
.btn:hover .arrow{transform:translateX(4px)}
.link-arrow{
  display:inline-flex;align-items:center;gap:6px;
  font-size:14px;font-weight:500;color:var(--accent);
  transition:color .16s var(--ease);
}
.link-arrow .arrow{transition:transform .16s var(--ease)}
.link-arrow:hover{color:var(--accent-dark)}
.link-arrow:hover .arrow{transform:translateX(4px)}

/* ---------- 页面头 ---------- */
.crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-size:12px;color:var(--muted);
  padding:32px 0 0;
}
.crumbs a{color:var(--muted);transition:color .16s var(--ease)}
.crumbs a:hover{color:var(--accent)}
.crumbs .sep{color:var(--line)}
.crumbs .current{color:var(--ink)}
.page-head{padding:24px 0 8px;max-width:760px}
.page-head h1{
  font-size:clamp(28px,3.6vw,42px);
  line-height:1.25;
  margin-bottom:16px;
}
.page-head .lead{max-width:680px}
.chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}
.chip{
  display:inline-flex;align-items:center;
  height:36px;padding:0 16px;
  border:1px solid var(--line);
  border-radius:var(--radius-sm);
  background:var(--surface);
  font-size:14px;color:var(--text);
  transition:border-color .16s var(--ease),background .16s var(--ease),color .16s var(--ease);
}
.chip:hover{border-color:var(--accent);color:var(--accent)}
.chip.is-active{background:var(--teal);border-color:var(--teal);color:#fff}
.chip.is-active:hover{background:var(--teal-deep);border-color:var(--teal-deep);color:#fff}

/* ---------- 指标细条 ---------- */
.metrics{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  margin-top:48px;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.metric{padding:20px 24px;border-left:1px solid var(--line)}
.metric:first-child{border-left:0;padding-left:0}
.metric-k{font-family:var(--font-num);font-size:12px;letter-spacing:.12em;color:var(--brass);text-transform:uppercase}
.metric-t{display:block;margin-top:6px;font-size:14px;color:var(--ink);font-weight:500}
.metric-d{display:block;margin-top:4px;font-size:13px;color:var(--muted);line-height:1.6}

/* ---------- 宽幅图 ---------- */
.wide-figure{margin-top:56px}
.figure-frame{
  position:relative;
  overflow:hidden;
  border-radius:var(--radius);
  border:1px solid var(--line);
  background:#EFEAE0;
  aspect-ratio:16/6;
}
.figure-frame img{width:100%;height:100%;object-fit:cover}
.wide-figure figcaption{margin-top:12px;font-size:12px;color:var(--muted)}

/* ---------- 步骤列表 ---------- */
.steps{margin-top:8px;border-top:1px solid var(--line)}
.step{
  display:grid;
  grid-template-columns:112px minmax(0,1fr);
  gap:32px;
  padding:44px 0;
  border-bottom:1px solid var(--line);
}
.step-num{
  font-family:var(--font-serif);
  font-size:56px;
  font-weight:600;
  line-height:1;
  letter-spacing:-.02em;
  color:var(--accent);
}
.step-num::after{
  content:"";
  display:block;
  width:36px;height:1px;
  background:var(--brass);
  margin-top:16px;
}
.step-body{max-width:720px}
.step-body h2{font-size:22px;line-height:1.4;margin-bottom:14px}
.step-body p{font-size:16px;line-height:1.85;color:var(--text)}
.step-body p + p{margin-top:14px}
.step-note{
  display:flex;gap:10px;
  margin-top:18px;
  padding:14px 16px;
  background:var(--surface-3);
  border-left:3px solid var(--brass);
  border-radius:var(--radius-sm);
  font-size:14px;
  color:var(--text);
  line-height:1.7;
}
.step-note strong{color:var(--ink);font-weight:500}

/* ---------- FAQ ---------- */
.faq{display:flex;flex-direction:column;gap:12px;margin-top:8px}
.faq-item{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius);
  transition:border-color .16s var(--ease),box-shadow .24s var(--ease);
}
.faq-item:hover{border-color:#CFC7B9}
.faq-item.is-open{border-color:var(--accent)}
.faq-q{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  width:100%;
  padding:20px 24px;
  text-align:left;
  font-size:17px;
  font-weight:500;
  color:var(--ink);
  line-height:1.5;
}
.faq-icon{
  position:relative;
  flex:0 0 16px;
  width:16px;height:16px;
}
.faq-icon::before,.faq-icon::after{
  content:"";position:absolute;left:50%;top:50%;
  width:12px;height:1.5px;background:var(--accent);
  transform:translate(-50%,-50%);
  transition:transform .24s var(--ease),opacity .24s var(--ease);
}
.faq-icon::after{transform:translate(-50%,-50%) rotate(90deg)}
.faq-item.is-open .faq-icon::after{transform:translate(-50%,-50%) rotate(0deg);opacity:0}
.faq-a{
  max-height:0;
  overflow:hidden;
  transition:max-height .32s var(--ease);
}
.faq-a-inner{padding:0 24px 22px;font-size:15px;line-height:1.85;color:var(--text);max-width:720px}

/* ---------- 整幅 CTA ---------- */
.cta-band{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:40px;
  flex-wrap:wrap;
  background:var(--teal);
  color:#fff;
  border-radius:var(--radius);
  padding:56px;
  margin-top:8px;
}
.cta-band h2{color:#fff;font-size:clamp(22px,2.4vw,30px);line-height:1.35;margin-bottom:12px}
.cta-band p{font-size:15px;line-height:1.8;color:rgba(255,255,255,.78);max-width:560px}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px}

/* ---------- 相关内容 ---------- */
.rel-list{border-top:1px solid var(--line)}
.rel-item{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  padding:22px 4px;
  border-bottom:1px solid var(--line);
  transition:background .16s var(--ease),padding-left .16s var(--ease);
}
.rel-item:hover{background:var(--surface);padding-left:16px}
.rel-main{min-width:0}
.rel-title{display:block;font-size:17px;font-weight:500;color:var(--ink);line-height:1.5}
.rel-desc{display:block;margin-top:4px;font-size:14px;color:var(--muted);line-height:1.6}
.rel-tag{
  flex:0 0 auto;
  display:inline-flex;align-items:center;
  height:22px;padding:0 10px;
  border:1px solid var(--brass);
  border-radius:var(--radius-sm);
  font-size:12px;color:var(--brass);
  white-space:nowrap;
}

/* ---------- 页脚 ---------- */
.footer{background:var(--ink);color:rgba(255,255,255,.72);padding:64px 0 32px;margin-top:96px}
.footer-grid{
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr 1fr;
  gap:40px;
  padding-bottom:40px;
  border-bottom:1px solid rgba(255,255,255,.12);
}
.footer-brand{
  font-family:var(--font-serif);
  font-size:22px;
  font-weight:700;
  color:#fff;
  letter-spacing:-.01em;
  line-height:1.2;
}
.footer-brand em{
  font-style:normal;
  font-family:var(--font-sans);
  font-size:11px;
  font-weight:400;
  letter-spacing:.14em;
  color:rgba(255,255,255,.6);
  margin-left:8px;
}
.footer-tag{margin-top:14px;font-size:13px;line-height:1.8;max-width:320px}
.footer-col h3{
  font-family:var(--font-sans);
  font-size:13px;
  font-weight:500;
  color:#fff;
  letter-spacing:.08em;
  margin-bottom:16px;
}
.footer-col a,.footer-col p{
  display:block;
  font-size:13px;
  line-height:1.9;
  color:rgba(255,255,255,.72);
  transition:color .16s var(--ease);
}
.footer-col a:hover{color:#fff;text-decoration:underline}
.footer-bottom{
  display:flex;
  justify-content:space-between;
  gap:16px;
  flex-wrap:wrap;
  padding-top:24px;
  font-size:12px;
  color:rgba(255,255,255,.5);
}

/* ---------- 入场动效 ---------- */
.reveal{opacity:0;transform:translateY(8px)}
.reveal.in{opacity:1;transform:none;transition:opacity .32s var(--ease),transform .32s var(--ease)}

/* ---------- 响应式 ---------- */
@media (max-width:1199px){
  .container{padding:0 32px}
  .cta-band{padding:44px}
}
@media (max-width:1023px){
  .topbar{display:flex}
  .sidebar{
    position:fixed;
    inset:0;
    width:100%;
    max-width:none;
    height:100vh;
    border-right:0;
    background:var(--surface);
    transform:translateX(-100%);
    transition:transform .32s var(--ease);
    z-index:900;
  }
  body.nav-open .sidebar{transform:translateX(0)}
  .sidebar-inner{padding:72px 0 24px}
  .brand{padding:0 24px 20px}
  .nav{padding:0 12px}
  .nav-link{height:52px;font-size:16px;padding:0 16px;border-left-width:0;border-bottom:1px solid var(--line)}
  .nav-link.is-active{background:var(--surface-3);border-left-width:3px;border-bottom-color:var(--line)}
  .sidebar-foot{padding:24px;border-top:1px solid var(--line)}
  .section{padding:64px 0}
  .metrics{grid-template-columns:repeat(2,1fr)}
  .metric:nth-child(odd){border-left:0;padding-left:0}
  .metric:nth-child(3),.metric:nth-child(4){border-top:1px solid var(--line)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer{margin-top:64px}
}
@media (max-width:767px){
  .container{padding:0 20px}
  .section{padding:56px 0}
  .page-head h1{font-size:28px}
  .figure-frame{aspect-ratio:16/9}
  .step{grid-template-columns:1fr;gap:16px;padding:36px 0}
  .step-num{font-size:44px}
  .step-num::after{margin-top:12px}
  .cta-band{padding:32px 24px;gap:24px}
  .cta-actions{width:100%}
  .cta-actions .btn{width:100%}
  .rel-item{align-items:flex-start;flex-direction:column;gap:8px}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .footer-bottom{flex-direction:column}
  .faq-q{padding:18px 18px;font-size:16px}
  .faq-a-inner{padding:0 18px 20px}
}
@media (max-width:519px){
  .metrics{grid-template-columns:1fr}
  .metric{border-left:0;padding-left:0}
  .metric + .metric{border-top:1px solid var(--line)}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms !important;transition-duration:.001ms !important}
  .reveal{opacity:1;transform:none}
}