/* roulang page: index */
:root{
  --bg-0:#0A0B0F;
  --bg-1:#121419;
  --bg-2:#1A1D24;
  --line:#262A33;
  --brand:#FF5A2B;
  --brand-soft:#FFB49B;
  --accent:#35E0C8;
  --text-1:#F4F5F8;
  --text-2:#A7ADBA;
  --text-3:#6E7484;
  --ok:#3ED598;
  --warn:#FFB020;
  --err:#FF4D4F;
  --r-card:16px;
  --r-img:12px;
  --r-btn:10px;
  --r-pill:999px;
  --r-input:12px;
  --shadow-hover:0 18px 40px rgba(0,0,0,.45);
  --ease:cubic-bezier(.22,.61,.36,1);
  --container:1240px;
  --gap:24px;
  --font-cn:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
  --font-num:"Inter","Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg-0);
  color:var(--text-1);
  font-family:var(--font-cn);
  font-size:16.5px;
  line-height:1.85;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto;}
a{color:inherit;text-decoration:none;}
button,input{font:inherit;color:inherit;}
button{background:none;border:0;cursor:pointer;}
ul,ol{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4,p{margin:0;}
table{border-collapse:collapse;width:100%;}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:4px;}
::selection{background:rgba(255,90,43,.35);}

.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 32px;}
.narrow{max-width:900px;}
.section{padding:104px 0;}
.section--tight{padding:72px 0;}
.mono{font-family:var(--font-num);font-variant-numeric:tabular-nums;}

/* ===== 顶部导航 ===== */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(10,11,15,.92);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
  transition:background .24s var(--ease),border-color .24s var(--ease);
}
.site-header.scrolled{background:rgba(10,11,15,.97);border-color:#30353f;}
.nav-wrap{
  display:flex;align-items:center;gap:22px;
  min-height:72px;
  transition:min-height .24s var(--ease);
}
.site-header.scrolled .nav-wrap{min-height:60px;}
.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto;}
.brand-mark{
  width:34px;height:34px;border-radius:10px;
  background:linear-gradient(140deg,var(--brand),#c93d16);
  display:grid;place-items:center;
  font-family:var(--font-num);font-weight:800;font-size:15px;color:#150806;
  flex:0 0 auto;
}
.brand-text{display:flex;align-items:center;gap:8px;}
.brand-name{font-size:17px;font-weight:800;letter-spacing:-.01em;white-space:nowrap;}
.brand-badge{
  font-size:11px;line-height:1;padding:4px 7px;border-radius:6px;
  border:1px solid rgba(255,90,43,.5);color:var(--brand-soft);
  letter-spacing:.06em;white-space:nowrap;
}
.search{flex:1 1 auto;min-width:0;max-width:640px;margin:0 auto;}
.search-form{
  display:flex;align-items:center;gap:8px;
  background:var(--bg-1);border:1px solid var(--line);
  border-radius:var(--r-pill);padding:5px 5px 5px 16px;
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.search-form:focus-within{border-color:var(--brand);background:var(--bg-2);border-width:1px;}
.search-ico{width:17px;height:17px;flex:0 0 auto;stroke:var(--text-3);fill:none;stroke-width:1.8;}
.search-input{
  flex:1 1 auto;min-width:0;background:transparent;border:0;outline:none;
  font-size:14.5px;padding:9px 0;color:var(--text-1);
}
.search-input::placeholder{color:var(--text-3);}
.search-key{
  font-family:var(--font-num);font-size:11px;color:var(--text-3);
  border:1px solid var(--line);border-radius:6px;padding:1px 6px;
  margin-right:2px;flex:0 0 auto;
}
.search-btn{
  flex:0 0 auto;height:36px;padding:0 18px;border-radius:var(--r-pill);
  background:var(--brand);color:#180906;font-weight:700;font-size:13.5px;
  transition:filter .2s var(--ease),transform .2s var(--ease);
}
.search-btn:hover{filter:brightness(1.08);transform:translateY(-1px);}
.search-btn:active{transform:translateY(0);}

.nav-links{display:flex;align-items:center;gap:4px;flex:0 0 auto;}
.nav-link{
  display:inline-flex;align-items:center;height:40px;padding:0 12px;
  border-radius:10px;font-size:14.5px;color:var(--text-2);
  transition:color .2s var(--ease),background .2s var(--ease);
  white-space:nowrap;
}
.nav-link:hover{color:var(--text-1);background:var(--bg-1);}
.nav-link.is-active{color:var(--brand-soft);background:rgba(255,90,43,.1);}
.nav-fav{
  display:inline-flex;align-items:center;gap:6px;height:40px;padding:0 14px;margin-left:6px;
  border:1px solid var(--line);border-radius:var(--r-pill);font-size:13.5px;color:var(--text-2);
  transition:border-color .2s var(--ease),color .2s var(--ease);
  white-space:nowrap;
}
.nav-fav:hover{border-color:rgba(255,90,43,.55);color:var(--brand-soft);}
.burger{
  display:none;width:44px;height:44px;border:1px solid var(--line);border-radius:12px;
  align-items:center;justify-content:center;flex:0 0 auto;
}
.burger span{display:block;width:16px;height:1.6px;background:var(--text-1);position:relative;}
.burger span::before,.burger span::after{
  content:"";position:absolute;left:0;width:16px;height:1.6px;background:var(--text-1);
}
.burger span::before{top:-5px;}
.burger span::after{top:5px;}

.drawer{
  position:fixed;inset:0 0 0 auto;width:min(340px,86vw);z-index:80;
  background:var(--bg-1);border-left:1px solid var(--line);
  transform:translateX(102%);transition:transform .28s var(--ease);
  padding:24px;overflow-y:auto;
}
.drawer.open{transform:translateX(0);}
.drawer-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;}
.drawer-close{width:40px;height:40px;border:1px solid var(--line);border-radius:10px;color:var(--text-2);font-size:18px;line-height:1;}
.drawer-nav{display:flex;flex-direction:column;gap:4px;}
.drawer-nav a{
  padding:13px 14px;border-radius:12px;color:var(--text-2);font-size:15px;
  border:1px solid transparent;transition:all .2s var(--ease);
}
.drawer-nav a:hover,.drawer-nav a.is-active{color:var(--text-1);background:var(--bg-2);border-color:var(--line);}
.drawer-mask{
  position:fixed;inset:0;background:rgba(0,0,0,.6);z-index:70;
  opacity:0;visibility:hidden;transition:opacity .28s var(--ease),visibility .28s;
}
.drawer-mask.open{opacity:1;visibility:visible;}

/* ===== 通用排版 ===== */
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12.5px;letter-spacing:.14em;color:var(--accent);
  text-transform:uppercase;margin-bottom:18px;
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--accent);}
.h1{
  font-size:clamp(2.5rem,6.4vw,5.5rem);line-height:1.05;font-weight:800;
  letter-spacing:-.02em;
}
.h2{
  font-size:clamp(1.75rem,3.2vw,2.75rem);line-height:1.15;font-weight:700;
  letter-spacing:-.015em;
}
.h3{font-size:1.3rem;line-height:1.4;font-weight:600;}
.lead{color:var(--text-2);font-size:17px;line-height:1.85;}
.muted{color:var(--text-3);font-size:14px;}
.section-head{
  display:flex;align-items:flex-end;justify-content:space-between;gap:24px;
  margin-bottom:44px;flex-wrap:wrap;
}
.section-head p{margin-top:12px;color:var(--text-2);max-width:640px;}
.divider{height:1px;background:var(--line);border:0;margin:0;}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 24px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;letter-spacing:.01em;
  transition:transform .2s var(--ease),filter .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease),background .2s var(--ease);
  border:1px solid transparent;
}
.btn-primary{background:var(--brand);color:#180906;}
.btn-primary:hover{filter:brightness(1.08);transform:translateY(-2px);}
.btn-primary:active{transform:translateY(0);}
.btn-ghost{border-color:var(--line);color:var(--text-1);background:transparent;}
.btn-ghost:hover{border-color:rgba(255,90,43,.6);color:var(--brand-soft);transform:translateY(-2px);}
.btn[disabled],.btn.is-disabled{opacity:.4;cursor:not-allowed;transform:none;}
.link-arrow{
  display:inline-flex;align-items:center;gap:6px;color:var(--brand-soft);
  font-size:14.5px;position:relative;padding-bottom:3px;
}
.link-arrow::after{
  content:"";position:absolute;left:0;bottom:0;height:1px;width:0;background:var(--brand);
  transition:width .24s var(--ease);
}
.link-arrow:hover::after{width:100%;}
.tag{
  display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:var(--r-pill);
  background:rgba(255,90,43,.12);color:var(--brand-soft);
  font-size:12px;letter-spacing:.06em;white-space:nowrap;
}
.tag--accent{background:rgba(53,224,200,.12);color:var(--accent);}
.tag--mute{background:rgba(255,255,255,.05);color:var(--text-2);}
.breadcrumb{font-size:13px;color:var(--text-3);display:flex;gap:8px;flex-wrap:wrap;}
.breadcrumb a:hover{color:var(--brand-soft);}

/* ===== Hero ===== */
.hero{padding:88px 0 72px;border-bottom:1px solid var(--line);}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:56px;align-items:center;}
.hero h1{margin-bottom:22px;}
.hero-sub{color:var(--text-2);font-size:18px;max-width:560px;margin-bottom:20px;}
.hero-note{
  display:flex;flex-wrap:wrap;gap:10px;margin-bottom:32px;
}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;}
.hero-visual{position:relative;border-radius:var(--r-card);overflow:hidden;border:1px solid var(--line);}
.hero-visual img{width:100%;aspect-ratio:4/3;object-fit:cover;}
.hero-visual figcaption{
  position:absolute;left:16px;top:16px;
  background:rgba(10,11,15,.78);border:1px solid var(--line);
  padding:7px 12px;border-radius:var(--r-pill);
  font-size:12.5px;color:var(--brand-soft);letter-spacing:.06em;
}
.hero-visual::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(10,11,15,0) 45%,rgba(10,11,15,.72) 100%);
  pointer-events:none;
}
.hero-badge{
  position:absolute;right:16px;bottom:16px;z-index:2;
  display:flex;align-items:center;gap:8px;
  background:rgba(10,11,15,.85);border:1px solid rgba(255,90,43,.4);
  border-radius:var(--r-pill);padding:8px 14px;font-size:12.5px;color:var(--text-1);
}
.pulse-dot{width:7px;height:7px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 4px rgba(53,224,200,.16);}
.hero-stats{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--r-card);
  overflow:hidden;margin-top:64px;
}
.stat{background:var(--bg-1);padding:22px 24px;}
.stat-num{font-family:var(--font-num);font-size:clamp(1.6rem,2.6vw,2.2rem);font-weight:700;letter-spacing:-.01em;}
.stat-num span{color:var(--brand);}
.stat-label{color:var(--text-3);font-size:13px;margin-top:4px;}

/* ===== 要点卡 ===== */
.points-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:var(--gap);}
.point{
  background:var(--bg-1);border:1px solid var(--line);border-radius:var(--r-card);
  padding:28px 24px;transition:transform .22s var(--ease),border-color .22s var(--ease),box-shadow .22s var(--ease);
}
.point:hover{transform:translateY(-4px);border-color:rgba(255,90,43,.4);box-shadow:var(--shadow-hover);}
.point-ico{
  width:42px;height:42px;border-radius:12px;display:grid;place-items:center;
  background:rgba(53,224,200,.1);color:var(--accent);margin-bottom:18px;
  font-family:var(--font-num);font-weight:700;
}
.point h3{margin-bottom:10px;font-size:1.15rem;}
.point p{color:var(--text-2);font-size:14.8px;}

/* ===== 合集目录 ===== */
.collection-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:var(--gap);}
.collection-card{
  display:flex;flex-direction:column;
  background:var(--bg-1);border:1px solid var(--line);border-radius:var(--r-card);
  overflow:hidden;transition:transform .22s var(--ease),border-color .22s var(--ease),box-shadow .22s var(--ease);
}
.collection-card:hover{transform:translateY(-4px);border-color:rgba(255,90,43,.45);box-shadow:var(--shadow-hover);}
.collection-thumb{overflow:hidden;border-bottom:1px solid var(--line);}
.collection-thumb img{width:100%;aspect-ratio:16/9;object-fit:cover;transition:transform .3s var(--ease);}
.collection-card:hover .collection-thumb img{transform:scale(1.04);}
.collection-body{padding:20px;display:flex;flex-direction:column;gap:10px;flex:1;}
.collection-body h3{font-size:1.2rem;line-height:1.4;}
.collection-body p{color:var(--text-2);font-size:14.5px;}
.collection-meta{
  margin-top:auto;padding-top:14px;border-top:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;
  color:var(--text-3);font-size:12.5px;
}

/* ===== 精选条目 ===== */
.featured-grid{display:grid;grid-template-columns:minmax(0,8fr) minmax(0,4fr);gap:var(--gap);}
.feature-main{
  display:flex;flex-direction:column;background:var(--bg-1);border:1px solid var(--line);
  border-radius:var(--r-card);overflow:hidden;
  transition:transform .22s var(--ease),border-color .22s var(--ease),box-shadow .22s var(--ease);
}
.feature-main:hover{transform:translateY(-4px);border-color:rgba(255,90,43,.45);box-shadow:var(--shadow-hover);}
.feature-main img{width:100%;aspect-ratio:16/9;object-fit:cover;}
.feature-main-body{padding:32px;}
.feature-main-body h3{font-size:clamp(1.4rem,2.2vw,1.9rem);line-height:1.3;margin:16px 0 14px;}
.feature-main-body p{color:var(--text-2);max-width:660px;}
.feature-meta{display:flex;gap:16px;color:var(--text-3);font-size:13px;margin-top:22px;flex-wrap:wrap;}
.feature-list{display:flex;flex-direction:column;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;}
.feature-item{
  background:var(--bg-1);padding:20px;display:flex;gap:16px;
  transition:background .2s var(--ease);
}
.feature-item:hover{background:var(--bg-2);}
.feature-index{
  font-family:var(--font-num);font-size:26px;font-weight:800;color:var(--brand);
  line-height:1;letter-spacing:-.02em;flex:0 0 auto;padding-top:4px;
}
.feature-item h4{font-size:1.02rem;font-weight:600;line-height:1.5;margin-bottom:6px;}
.feature-item p{color:var(--text-3);font-size:13.6px;line-height:1.7;}

/* ===== 最新信息（CMS） ===== */
.news-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--gap);}
.news-card{
  display:flex;flex-direction:column;gap:12px;height:100%;
  background:var(--bg-1);border:1px solid var(--line);border-radius:var(--r-card);
  padding:24px;transition:transform .22s var(--ease),border-color .22s var(--ease),box-shadow .22s var(--ease);
}
.news-card:hover{transform:translateY(-4px);border-color:rgba(255,90,43,.45);box-shadow:var(--shadow-hover);}
.news-card h3{font-size:1.14rem;line-height:1.5;}
.news-card:hover h3{color:var(--brand-soft);}
.news-card p{color:var(--text-2);font-size:14.6px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;}
.news-foot{
  margin-top:auto;padding-top:14px;border-top:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;
  color:var(--text-3);font-size:12.6px;
}
.empty-state{
  grid-column:1/-1;text-align:center;padding:56px 24px;
  background:var(--bg-1);border:1px dashed var(--line);border-radius:var(--r-card);
}
.empty-state svg{width:38px;height:38px;stroke:var(--text-3);fill:none;stroke-width:1.5;margin:0 auto 16px;}
.empty-state p{color:var(--text-2);margin-bottom:18px;}

/* ===== 排行表 ===== */
.rank-wrap{border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;background:var(--bg-1);}
table.rank{font-size:14.6px;}
table.rank th{
  text-align:left;padding:16px 20px;color:var(--text-3);font-weight:500;font-size:12.5px;
  letter-spacing:.08em;border-bottom:1px solid var(--line);background:var(--bg-2);
}
table.rank td{padding:16px 20px;border-bottom:1px solid var(--line);color:var(--text-2);}
table.rank tbody tr:nth-child(odd){background:rgba(255,255,255,.015);}
table.rank tbody tr:last-child td{border-bottom:0;}
table.rank tbody tr:hover{background:var(--bg-2);}
table.rank td:first-child{width:64px;color:var(--brand);font-family:var(--font-num);font-weight:700;}
table.rank td.name{color:var(--text-1);font-weight:600;}
.heat{
  display:inline-block;height:6px;border-radius:3px;background:linear-gradient(90deg,var(--brand),rgba(255,90,43,.25));
  vertical-align:middle;margin-right:10px;
}

/* ===== 横向推荐 ===== */
.scroller-wrap{position:relative;}
.scroller{
  display:flex;gap:20px;overflow-x:auto;padding-bottom:12px;
  scroll-snap-type:x mandatory;scrollbar-width:thin;
}
.scroller::-webkit-scrollbar{height:6px;}
.scroller::-webkit-scrollbar-thumb{background:var(--line);border-radius:3px;}
.scroller::-webkit-scrollbar-track{background:transparent;}
.reco-card{
  flex:0 0 auto;width:318px;scroll-snap-align:start;
  background:var(--bg-1);border:1px solid var(--line);border-radius:var(--r-card);
  overflow:hidden;transition:transform .22s var(--ease),border-color .22s var(--ease);
}
.reco-card:hover{transform:translateY(-4px);border-color:rgba(255,90,43,.45);}
.reco-card img{width:100%;aspect-ratio:16/9;object-fit:cover;}
.reco-body{padding:18px 20px 20px;}
.reco-body h4{font-size:1.06rem;line-height:1.5;margin:10px 0 8px;}
.reco-body p{color:var(--text-3);font-size:13.6px;}
.scroller-wrap::before,.scroller-wrap::after{
  content:"";position:absolute;top:0;bottom:12px;width:56px;pointer-events:none;z-index:2;
}
.scroller-wrap::before{left:0;background:linear-gradient(90deg,var(--bg-0),rgba(10,11,15,0));}
.scroller-wrap::after{right:0;background:linear-gradient(270deg,var(--bg-0),rgba(10,11,15,0));}

/* ===== FAQ ===== */
.faq-list{border-top:1px solid var(--line);}
.faq-item{border-bottom:1px solid var(--line);}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:24px 4px;text-align:left;font-size:17px;font-weight:600;color:var(--text-1);
  transition:color .2s var(--ease);
}
.faq-q:hover{color:var(--brand-soft);}
.faq-sign{
  flex:0 0 auto;width:26px;height:26px;border:1px solid var(--line);border-radius:8px;
  display:grid;place-items:center;color:var(--brand);font-size:16px;line-height:1;
  transition:transform .26s var(--ease),border-color .2s var(--ease);
}
.faq-item.open .faq-sign{transform:rotate(45deg);border-color:rgba(255,90,43,.6);}
.faq-a{
  max-height:0;overflow:hidden;transition:max-height .32s var(--ease);
}
.faq-a p{color:var(--text-2);padding:0 40px 24px 4px;font-size:15.4px;max-width:820px;}

/* ===== CTA ===== */
.cta-band{
  border:1px solid rgba(255,90,43,.45);border-radius:var(--r-card);
  background:linear-gradient(135deg,var(--bg-1),#15100d 70%);
  padding:56px;display:flex;align-items:center;justify-content:space-between;gap:40px;
  position:relative;overflow:hidden;
}
.cta-band::after{
  content:"";position:absolute;right:-60px;top:-60px;width:240px;height:240px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,90,43,.18),transparent 68%);
}
.cta-band h2{font-size:clamp(1.6rem,3vw,2.4rem);line-height:1.2;margin-bottom:12px;max-width:620px;}
.cta-band p{color:var(--text-2);max-width:560px;}
.cta-actions{display:flex;gap:14px;flex:0 0 auto;position:relative;z-index:2;}

/* ===== 页脚 ===== */
.site-footer{border-top:1px solid var(--line);background:var(--bg-1);padding:72px 0 0;margin-top:104px;}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:40px;}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px;}
.footer-about{color:var(--text-2);font-size:14.6px;max-width:340px;}
.footer-col h4{font-size:13px;letter-spacing:.1em;color:var(--text-3);margin-bottom:18px;font-weight:500;}
.footer-col li{margin-bottom:11px;}
.footer-col a{color:var(--text-2);font-size:14.6px;transition:color .2s var(--ease);}
.footer-col a:hover{color:var(--brand-soft);}
.footer-contact p{color:var(--text-2);font-size:14.6px;margin-bottom:10px;}
.footer-bottom{
  margin-top:56px;border-top:1px solid var(--line);padding:22px 0;
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  color:var(--text-3);font-size:13px;
}
.footer-bottom a{color:var(--text-3);}
.footer-bottom a:hover{color:var(--brand-soft);}

/* ===== 返回顶部 ===== */
.to-top{
  position:fixed;right:24px;bottom:24px;z-index:50;
  width:46px;height:46px;border-radius:50%;border:1px solid var(--line);
  background:rgba(18,20,25,.9);color:var(--text-2);display:grid;place-items:center;
  opacity:0;visibility:hidden;transition:opacity .24s var(--ease),visibility .24s,border-color .2s var(--ease),color .2s var(--ease);
}
.to-top.show{opacity:1;visibility:visible;}
.to-top:hover{border-color:rgba(255,90,43,.6);color:var(--brand-soft);}

/* ===== 动效 ===== */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .5s var(--ease),transform .5s var(--ease);}
.reveal.in{opacity:1;transform:none;}

@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;}
  .reveal{opacity:1;transform:none;}
  html{scroll-behavior:auto;}
}

/* ===== 断点 ===== */
@media (max-width:1200px){
  .collection-grid{grid-template-columns:repeat(3,minmax(0,1fr));}
  .points-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr;gap:32px;}
}
@media (max-width:1024px){
  .container{padding:0 24px;}
  .nav-links{display:none;}
  .burger{display:flex;}
  .nav-wrap{flex-wrap:wrap;padding:12px 0;gap:14px;}
  .search{order:3;flex-basis:100%;max-width:none;margin:0;}
  .brand{order:1;}
  .burger{order:2;margin-left:auto;}
  .hero{padding:64px 0 56px;}
  .hero-grid{grid-template-columns:1fr;gap:40px;}
  .section{padding:76px 0;}
  .news-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .featured-grid{grid-template-columns:1fr;}
  .cta-band{padding:40px;flex-direction:column;align-items:flex-start;}
}
@media (max-width:768px){
  body{font-size:16px;}
  .section{padding:60px 0;}
  .collection-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .hero-stats{grid-template-columns:repeat(2,minmax(0,1fr));}
  .news-grid{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .footer-about{max-width:none;}
  .cta-actions{flex-direction:column;width:100%;}
  .cta-actions .btn{width:100%;}
  .reco-card{width:272px;}
  .stat{padding:18px;}
}
@media (max-width:520px){
  .container{padding:0 18px;}
  .brand-badge{display:none;}
  .brand-name{font-size:16px;}
  .search-form{padding:4px 4px 4px 12px;border-radius:12px;}
  .search-key{display:none;}
  .search-btn{height:36px;padding:0 14px;font-size:13px;}
  .points-grid{grid-template-columns:1fr;}
  .collection-grid{grid-template-columns:1fr;}
  .feature-main-body{padding:22px;}
  .cta-band{padding:28px;}
  .footer-grid{grid-template-columns:1fr;}
  .to-top{right:16px;bottom:16px;}
  .hero-actions .btn{width:100%;}
  .hero-actions{flex-direction:column;}
}

/* roulang page: article */
:root{
  --bg-0:#0A0B0F;
  --bg-1:#121419;
  --bg-2:#1A1D24;
  --line:#262A33;
  --line-hover:rgba(255,90,43,.40);
  --brand:#FF5A2B;
  --brand-soft:#FFB49B;
  --accent:#35E0C8;
  --text-1:#F4F5F8;
  --text-2:#A7ADBA;
  --text-3:#6E7484;
  --ok:#3ED598;
  --warn:#FFB020;
  --err:#FF4D4F;
  --r-card:16px;
  --r-img:12px;
  --r-btn:10px;
  --r-pill:999px;
  --shadow-hover:0 18px 40px rgba(0,0,0,.45);
  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:220ms;
  --container:1240px;
  --gap:24px;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg-0);
  color:var(--text-1);
  font-family:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  font-size:16px;
  line-height:1.85;
  font-variant-numeric:tabular-nums;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border-radius:var(--r-img);}
a{color:inherit;text-decoration:none;transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),opacity var(--dur) var(--ease);}
a:hover{color:var(--brand-soft);}
button,input{font:inherit;color:inherit;}
button{cursor:pointer;}
h1,h2,h3,h4{margin:0;color:var(--text-1);font-weight:700;letter-spacing:-.01em;}
p{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
::selection{background:rgba(255,90,43,.32);color:#fff;}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px;}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;}

.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 32px;}
@media (min-width:1440px){:root{--container:1360px;}}

/* ============ 导航 ============ */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(10,11,15,.92);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(12px);
  transition:padding var(--dur) var(--ease),background var(--dur) var(--ease);
}
.site-header.is-scrolled{background:rgba(10,11,15,.98);}
.nav-wrap{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;
  gap:28px;
  height:72px;
  transition:height var(--dur) var(--ease);
}
.site-header.is-scrolled .nav-wrap{height:60px;}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none;}
.brand-mark{
  width:34px;height:34px;flex:none;border-radius:9px;
  display:grid;place-items:center;
  background:linear-gradient(140deg,var(--brand),#d43c14);
  color:#1a0b05;font-weight:800;font-size:17px;letter-spacing:-.02em;
  box-shadow:0 6px 16px rgba(255,90,43,.28);
}
.brand-text{display:flex;align-items:center;gap:8px;}
.brand-name{font-size:17px;font-weight:800;letter-spacing:-.02em;color:var(--text-1);white-space:nowrap;}
.brand-name-tail{color:var(--text-2);font-weight:600;}
.brand-badge{
  font-size:11px;line-height:1;padding:4px 7px;border-radius:6px;
  border:1px solid var(--line-hover);color:var(--brand-soft);
  background:rgba(255,90,43,.10);letter-spacing:.08em;
}
.search{width:100%;max-width:640px;margin:0 auto;}
.search-form{
  display:flex;align-items:center;gap:10px;
  height:46px;padding:0 6px 0 16px;
  background:var(--bg-1);border:1px solid var(--line);border-radius:var(--r-pill);
  transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.search-form:hover{border-color:#333846;}
.search-form:focus-within{border-color:var(--brand);border-width:2px;background:var(--bg-2);}
.search-ico{width:18px;height:18px;flex:none;stroke:var(--text-3);fill:none;stroke-width:1.8;stroke-linecap:round;}
.search-input{flex:1;min-width:0;border:0;background:transparent;outline:none;font-size:14.5px;color:var(--text-1);}
.search-input::placeholder{color:var(--text-3);}
.search-key{
  flex:none;font-size:11px;color:var(--text-3);border:1px solid var(--line);
  border-radius:5px;padding:1px 6px;line-height:1.5;
}
.search-btn{
  flex:none;height:34px;padding:0 20px;border:0;border-radius:var(--r-pill);
  background:var(--brand);color:#1a0b05;font-weight:700;font-size:14px;
  transition:filter var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.search-btn:hover{filter:brightness(1.08);transform:translateY(-1px);}
.nav-links{display:flex;align-items:center;gap:6px;}
.nav-link{
  font-size:14.5px;color:var(--text-2);padding:9px 12px;border-radius:var(--r-btn);
  border:1px solid transparent;white-space:nowrap;
}
.nav-link:hover{color:var(--text-1);background:var(--bg-1);border-color:var(--line);}
.nav-link.is-active{color:var(--brand-soft);background:rgba(255,90,43,.10);border-color:var(--line-hover);}
.burger{
  display:none;width:44px;height:44px;border:1px solid var(--line);border-radius:var(--r-btn);
  background:var(--bg-1);align-items:center;justify-content:center;
}
.burger span{display:block;width:18px;height:2px;background:var(--text-1);position:relative;}
.burger span::before,.burger span::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:var(--text-1);
}
.burger span::before{top:-6px;}
.burger span::after{top:6px;}

@media (max-width:1024px){
  .container{padding:0 24px;}
  .nav-wrap{grid-template-columns:1fr auto;row-gap:12px;height:auto;padding:14px 0;}
  .site-header.is-scrolled .nav-wrap{height:auto;}
  .search{grid-column:1 / -1;order:3;max-width:none;margin:0;}
  .burger{display:flex;order:2;}
  .nav-links{
    position:fixed;top:0;right:0;bottom:0;width:min(320px,86vw);
    background:var(--bg-1);border-left:1px solid var(--line);
    flex-direction:column;align-items:stretch;gap:0;
    padding:92px 22px 24px;z-index:70;overflow-y:auto;
    transform:translateX(102%);transition:transform var(--dur) var(--ease);
  }
  .nav-links.is-open{transform:none;}
  .nav-link{padding:15px 4px;border-bottom:1px solid var(--line);border-radius:0;font-size:16px;color:var(--text-1);}
  .nav-link.is-active{background:transparent;border-color:var(--line);color:var(--brand-soft);}
}
@media (max-width:520px){
  .container{padding:0 18px;}
  .brand-name{font-size:15.5px;}
  .brand-name-tail{display:none;}
  .search-form{height:44px;border-radius:12px;padding-left:12px;}
  .search-key{display:none;}
  .search-btn{height:34px;padding:0 14px;font-size:13.5px;}
}

/* ============ 通用按钮 / 标签 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 24px;border-radius:var(--r-btn);
  font-size:15px;font-weight:700;border:1px solid transparent;
  transition:transform var(--dur) var(--ease),background var(--dur) var(--ease),border-color var(--dur) var(--ease),color var(--dur) var(--ease),filter var(--dur) var(--ease);
}
.btn-primary{background:var(--brand);color:#1a0b05;}
.btn-primary:hover{filter:brightness(1.08);transform:translateY(-2px);color:#1a0b05;}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--text-1);}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand-soft);transform:translateY(-2px);}
.btn-text{
  display:inline-flex;align-items:center;gap:6px;color:var(--brand-soft);
  font-size:14.5px;font-weight:600;background:none;border:0;padding:4px 0;
  position:relative;
}
.btn-text::after{
  content:"";position:absolute;left:0;bottom:0;height:1px;width:100%;
  background:var(--brand-soft);transform:scaleX(0);transform-origin:left;
  transition:transform var(--dur) var(--ease);
}
.btn-text:hover::after{transform:scaleX(1);}
.btn:disabled,.btn[disabled]{opacity:.4;cursor:not-allowed;transform:none;}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  font-size:12px;letter-spacing:.06em;padding:5px 12px;border-radius:var(--r-pill);
  background:rgba(255,90,43,.12);color:var(--brand-soft);
  border:1px solid rgba(255,90,43,.22);
}
.tag-accent{background:rgba(53,224,200,.10);color:var(--accent);border-color:rgba(53,224,200,.24);}

/* ============ 文章头部 ============ */
.article-hero{
  position:relative;
  padding:56px 0 40px;
  border-bottom:1px solid var(--line);
  background:
    linear-gradient(180deg,rgba(10,11,15,.72),rgba(10,11,15,.96)),
    url("/assets/images/backpic/back-2.webp") center/cover no-repeat;
  overflow:hidden;
}
.crumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--text-3);margin-bottom:22px;}
.crumb a{color:var(--text-3);}
.crumb a:hover{color:var(--brand-soft);}
.crumb .sep{color:#3a3f4b;}
.crumb .current{color:var(--text-1);max-width:70ch;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.article-h1{
  font-size:clamp(2rem,4.4vw,3.4rem);
  line-height:1.14;
  font-weight:800;
  letter-spacing:-.02em;
  max-width:22ch;
  word-break:break-word;
}
.meta-bar{
  display:flex;flex-wrap:wrap;align-items:center;gap:14px;
  margin-top:26px;font-size:13.5px;color:var(--text-2);
}
.meta-item{display:inline-flex;align-items:center;gap:7px;}
.meta-item svg{width:15px;height:15px;stroke:var(--text-3);fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;}
.meta-dot{width:4px;height:4px;border-radius:50%;background:#3a3f4b;}

/* ============ 布局 ============ */
.article-layout{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:56px;
  padding:64px 0 96px;
}
@media (min-width:1200px){
  .article-layout{grid-template-columns:minmax(0,1fr) 260px;}
}
.article-main{min-width:0;}

/* ============ 正文 ============ */
.article-body{
  max-width:760px;
  font-size:17.5px;
  line-height:1.9;
  color:var(--text-2);
}
.article-body > * + *{margin-top:1.25em;}
.article-body h2{
  font-size:clamp(1.35rem,2.2vw,1.8rem);
  line-height:1.32;
  margin-top:2.2em;
  padding-left:14px;
  position:relative;
}
.article-body h2::before{
  content:"";position:absolute;left:0;top:.28em;bottom:.28em;width:3px;
  border-radius:2px;background:var(--brand);
}
.article-body h3{
  font-size:1.16rem;line-height:1.4;margin-top:1.8em;color:var(--text-1);
}
.article-body p{color:var(--text-2);}
.article-body a{color:var(--brand-soft);border-bottom:1px solid rgba(255,180,155,.35);}
.article-body a:hover{color:var(--brand);}
.article-body strong{color:var(--text-1);}
.article-body ul,.article-body ol{padding-left:1.35em;}
.article-body ul{list-style:disc;}
.article-body ol{list-style:decimal;}
.article-body li{margin-top:.5em;padding-left:.2em;}
.article-body li::marker{color:var(--brand);}
.article-body blockquote{
  margin:1.8em 0;padding:18px 22px;
  background:var(--bg-1);border-left:3px solid var(--brand);
  border-radius:0 var(--r-img) var(--r-img) 0;color:var(--text-1);
}
.article-body blockquote p{color:var(--text-2);margin:0;}
.article-body img{border-radius:var(--r-img);border:1px solid var(--line);height:auto;margin:1.6em 0;}
.article-body figure{margin:1.8em 0;}
.article-body figcaption{
  margin-top:10px;font-size:13px;color:var(--text-3);text-align:center;line-height:1.7;
}
.article-body table{
  width:100%;border-collapse:collapse;margin:1.8em 0;
  border:1px solid var(--line);border-radius:var(--r-img);overflow:hidden;font-size:15px;
}
.article-body th,.article-body td{
  padding:12px 14px;border-bottom:1px solid var(--line);text-align:left;color:var(--text-2);
}
.article-body th{background:var(--bg-1);color:var(--text-1);font-weight:700;font-size:14px;}
.article-body tbody tr:nth-child(even){background:rgba(255,255,255,.018);}
.article-body tbody tr:last-child td{border-bottom:0;}
.article-body pre{
  background:var(--bg-2);border:1px solid var(--line);border-radius:var(--r-img);
  padding:16px 18px;overflow-x:auto;font-size:14px;line-height:1.75;
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;color:#d8dbe2;
}
.article-body code{
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  font-size:.92em;background:var(--bg-2);border:1px solid var(--line);
  border-radius:6px;padding:2px 6px;color:var(--brand-soft);
}
.article-body pre code{background:none;border:0;padding:0;color:inherit;}
.article-body hr{border:0;border-top:1px solid var(--line);margin:2.4em 0;}

/* 空态 */
.empty-state{
  max-width:760px;padding:56px 28px;text-align:center;
  background:var(--bg-1);border:1px solid var(--line);border-radius:var(--r-card);
}
.empty-state svg{width:44px;height:44px;margin:0 auto 16px;stroke:var(--text-3);fill:none;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round;}
.empty-state h2{font-size:1.4rem;margin-bottom:10px;}
.empty-state p{color:var(--text-2);font-size:15px;margin-bottom:22px;}

/* 标签行 + 操作条 */
.tag-row{
  display:flex;flex-wrap:wrap;gap:10px;align-items:center;
  max-width:760px;margin-top:44px;padding-top:26px;border-top:1px solid var(--line);
}
.action-bar{
  max-width:760px;margin-top:26px;padding:20px 22px;
  display:flex;flex-wrap:wrap;gap:16px;align-items:center;justify-content:space-between;
  background:var(--bg-1);border:1px solid var(--line);border-radius:var(--r-card);
}
.action-bar .action-text{font-size:14.5px;color:var(--text-2);}
.action-bar .action-btns{display:flex;gap:12px;flex-wrap:wrap;}
.action-bar .btn{height:44px;padding:0 20px;font-size:14.5px;}

/* 粘性目录 */
.toc-aside{display:none;}
@media (min-width:1200px){
  .toc-aside{display:block;}
  .toc{position:sticky;top:104px;}
  .toc-title{
    font-size:12px;letter-spacing:.14em;color:var(--text-3);
    text-transform:uppercase;margin-bottom:14px;
  }
  .toc-list{list-style:none;padding:0;margin:0;border-left:1px solid var(--line);}
  .toc-list li{margin:0;}
  .toc-link{
    display:block;padding:8px 0 8px 16px;margin-left:-1px;font-size:13.5px;
    color:var(--text-3);border-left:2px solid transparent;line-height:1.6;
    transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
  }
  .toc-link:hover{color:var(--text-1);}
  .toc-link.is-current{color:var(--brand);border-left-color:var(--brand);}
  .toc-link.lv-3{padding-left:30px;font-size:13px;}
  .toc-empty{font-size:13px;color:var(--text-3);}
}

/* ============ 板块通用 ============ */
.section{padding:88px 0;}
@media (max-width:768px){.section{padding:56px 0;}}
.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:18px;margin-bottom:40px;
}
.section-head h2{font-size:clamp(1.6rem,3vw,2.4rem);line-height:1.18;}
.section-head p{color:var(--text-2);font-size:15px;margin-top:10px;max-width:62ch;}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12px;letter-spacing:.14em;color:var(--accent);margin-bottom:14px;
}
.eyebrow::before{content:"";width:18px;height:1px;background:var(--accent);}

/* 相关推荐卡片 */
.related-grid{
  display:grid;gap:var(--gap);
  grid-template-columns:repeat(4,minmax(0,1fr));
}
@media (max-width:1199px){.related-grid{grid-template-columns:repeat(3,minmax(0,1fr));}}
@media (max-width:991px){.related-grid{grid-template-columns:repeat(2,minmax(0,1fr));}}
@media (max-width:520px){.related-grid{grid-template-columns:1fr;}}
.card{
  display:flex;flex-direction:column;
  background:var(--bg-2);border:1px solid var(--line);border-radius:var(--r-card);
  overflow:hidden;
  transition:transform var(--dur) var(--ease),border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.card:hover{transform:translateY(-4px);border-color:var(--line-hover);box-shadow:var(--shadow-hover);}
.card-media{position:relative;aspect-ratio:16/9;overflow:hidden;background:var(--bg-1);}
.card-media img{width:100%;height:100%;object-fit:cover;border-radius:0;transition:transform var(--dur) var(--ease);}
.card:hover .card-media img{transform:scale(1.04);}
.card-body{padding:18px 18px 20px;display:flex;flex-direction:column;gap:10px;flex:1;}
.card-body h3{font-size:1.06rem;line-height:1.45;font-weight:600;}
.card:hover .card-body h3{color:var(--brand-soft);}
.card-body p{font-size:14px;color:var(--text-2);line-height:1.75;}
.card-meta{
  margin-top:auto;display:flex;align-items:center;justify-content:space-between;
  font-size:12.5px;color:var(--text-3);padding-top:12px;border-top:1px solid var(--line);
}

/* 返回栏目入口 */
.back-entry{
  border:1px solid var(--line);border-radius:var(--r-card);
  background:linear-gradient(120deg,rgba(255,90,43,.07),rgba(53,224,200,.04));
  padding:32px;
  display:flex;flex-wrap:wrap;gap:20px;align-items:center;justify-content:space-between;
}
.back-entry h3{font-size:1.3rem;margin-bottom:8px;}
.back-entry p{color:var(--text-2);font-size:14.5px;max-width:60ch;}

/* ============ 页脚 ============ */
.site-footer{
  background:var(--bg-1);
  border-top:1px solid var(--line);
  padding:64px 0 28px;
  margin-top:8px;
}
.footer-grid{
  display:grid;gap:40px;
  grid-template-columns:2fr 1fr 1fr 1.4fr;
  padding-bottom:44px;border-bottom:1px solid var(--line);
}
@media (max-width:991px){.footer-grid{grid-template-columns:1fr 1fr;gap:32px;}}
@media (max-width:520px){.footer-grid{grid-template-columns:1fr;}}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px;}
.footer-brand .brand-name{font-size:16.5px;}
.footer-about{color:var(--text-2);font-size:14px;line-height:1.8;max-width:46ch;}
.footer-col h4{font-size:14px;letter-spacing:.04em;margin-bottom:16px;color:var(--text-1);}
.footer-col ul{display:flex;flex-direction:column;gap:10px;}
.footer-col a{color:var(--text-2);font-size:14px;}
.footer-col a:hover{color:var(--brand-soft);}
.footer-contact p{color:var(--text-2);font-size:14px;line-height:1.8;}
.footer-contact .muted{color:var(--text-3);margin-top:10px;font-size:13px;}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;
  padding-top:24px;color:var(--text-3);font-size:13px;
}

/* 返回顶部 */
.to-top{
  position:fixed;right:24px;bottom:24px;width:46px;height:46px;
  display:grid;place-items:center;border-radius:50%;
  background:var(--bg-2);border:1px solid var(--line);color:var(--text-2);
  opacity:0;visibility:hidden;transform:translateY(10px);z-index:60;
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),border-color var(--dur) var(--ease),color var(--dur) var(--ease),visibility var(--dur);
}
.to-top.is-visible{opacity:1;visibility:visible;transform:none;}
.to-top:hover{border-color:var(--brand);color:var(--brand-soft);}
.to-top svg{width:18px;height:18px;stroke:currentColor;fill:none;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round;}

/* 进入动效 */
[data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .6s var(--ease),transform .6s var(--ease);}
[data-reveal].is-in{opacity:1;transform:none;}
@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important;}
  [data-reveal]{opacity:1;transform:none;}
  html{scroll-behavior:auto;}
}

/* roulang page: category1 */
:root{
  --bg-0:#0A0B0F;
  --bg-1:#121419;
  --bg-2:#1A1D24;
  --line:#262A33;
  --line-hover:rgba(255,90,43,.42);
  --brand:#FF5A2B;
  --brand-soft:#FFB49B;
  --accent:#35E0C8;
  --text-1:#F4F5F8;
  --text-2:#A7ADBA;
  --text-3:#6E7484;
  --ok:#3ED598;
  --warn:#FFB020;
  --err:#FF4D4F;
  --r-card:16px;
  --r-img:12px;
  --r-btn:10px;
  --r-pill:999px;
  --shadow-hover:0 18px 40px rgba(0,0,0,.45);
  --ease:cubic-bezier(.22,.61,.36,1);
  --font-sans:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Inter,Roboto,Helvetica,Arial,sans-serif;
  --font-num:Inter,"SF Mono",ui-monospace,"Roboto Mono",Menlo,Consolas,monospace;
  --container:1240px;
  --gutter:32px;
  --sec-y:100px;
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg-0);
  color:var(--text-1);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img{display:block;max-width:100%;height:auto;}
a{color:inherit;text-decoration:none;transition:color .22s var(--ease);}
a:hover{color:var(--brand-soft);}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
input{font:inherit;color:inherit;}
h1,h2,h3,h4{margin:0;font-weight:700;letter-spacing:-.01em;line-height:1.2;}
p{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
table{border-collapse:collapse;width:100%;}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px;}
::selection{background:rgba(255,90,43,.35);color:#fff;}

.container{
  width:100%;
  max-width:var(--container);
  margin:0 auto;
  padding:0 var(--gutter);
}
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}
.num{font-family:var(--font-num);font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1;}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(10,11,15,.86);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
  transition:background .24s var(--ease),border-color .24s var(--ease);
}
.site-header.is-scrolled{background:rgba(10,11,15,.95);}
.nav-wrap{
  display:flex;
  align-items:center;
  gap:26px;
  height:72px;
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex-shrink:0;
}
.brand-mark{
  width:34px;height:34px;
  border-radius:10px;
  background:var(--brand);
  color:#0A0B0F;
  display:grid;place-items:center;
  font-family:var(--font-num);
  font-weight:800;font-size:18px;
  line-height:1;
  flex-shrink:0;
}
.brand-text{display:flex;align-items:center;gap:8px;}
.brand-name{
  font-size:17px;font-weight:700;letter-spacing:.01em;color:var(--text-1);
  white-space:nowrap;
}
.brand-name-tail{color:var(--text-2);font-weight:600;}
.brand:hover .brand-name{color:var(--brand-soft);}
.brand-badge{
  display:inline-flex;align-items:center;height:20px;padding:0 8px;
  border-radius:var(--r-pill);
  font-size:11px;letter-spacing:.08em;
  color:var(--accent);
  background:rgba(53,224,200,.12);
  border:1px solid rgba(53,224,200,.28);
}

.search{
  flex:1 1 auto;
  min-width:0;
  max-width:640px;
}
.search-form{
  position:relative;
  display:flex;
  align-items:center;
  height:46px;
  border-radius:var(--r-pill);
  background:var(--bg-1);
  border:1px solid var(--line);
  padding:0 6px 0 42px;
  transition:border-color .22s var(--ease),background .22s var(--ease);
}
.search-form:focus-within{
  border-color:var(--brand);
  background:var(--bg-2);
}
.search-ico{
  position:absolute;
  left:15px;top:50%;
  transform:translateY(-50%);
  width:18px;height:18px;
  fill:none;stroke:var(--text-3);stroke-width:1.8;
  stroke-linecap:round;
  transition:stroke .22s var(--ease);
}
.search-form:focus-within .search-ico{stroke:var(--brand);}
.search-input{
  flex:1 1 auto;
  min-width:0;
  height:100%;
  background:none;
  border:0;
  outline:none;
  font-size:14px;
  color:var(--text-1);
}
.search-input::placeholder{color:var(--text-3);}
.search-input::-webkit-search-cancel-button{display:none;}
.search-key{
  display:inline-flex;align-items:center;justify-content:center;
  width:22px;height:22px;margin-right:8px;
  border-radius:6px;
  border:1px solid var(--line);
  background:var(--bg-2);
  color:var(--text-3);
  font-family:var(--font-num);
  font-size:11px;
  flex-shrink:0;
}
.search-btn{
  height:34px;
  padding:0 18px;
  border-radius:var(--r-pill);
  background:var(--brand);
  color:#0A0B0F;
  font-size:13.5px;
  font-weight:600;
  flex-shrink:0;
  transition:background .2s var(--ease),transform .2s var(--ease);
}
.search-btn:hover{background:#ff6f45;color:#0A0B0F;transform:translateY(-1px);}
.search-btn:active{transform:translateY(0);}

.nav-links{
  display:flex;
  align-items:center;
  gap:4px;
  flex-shrink:0;
}
.nav-link{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:38px;
  padding:0 12px;
  border-radius:8px;
  font-size:14px;
  color:var(--text-2);
  white-space:nowrap;
  transition:color .2s var(--ease),background .2s var(--ease);
}
.nav-link:hover{color:var(--text-1);background:var(--bg-1);}
.nav-link.is-active{
  color:var(--brand-soft);
  background:rgba(255,90,43,.1);
}
.burger{
  display:none;
  width:44px;height:44px;
  border-radius:10px;
  border:1px solid var(--line);
  align-items:center;
  justify-content:center;
  flex-shrink:0;
  margin-left:auto;
  transition:border-color .2s var(--ease);
}
.burger:hover{border-color:var(--line-hover);}
.burger span{
  position:relative;
  display:block;width:18px;height:2px;
  background:var(--text-1);
  border-radius:2px;
  transition:background .2s var(--ease);
}
.burger span::before,.burger span::after{
  content:"";position:absolute;left:0;width:18px;height:2px;
  background:var(--text-1);border-radius:2px;
  transition:transform .24s var(--ease),top .24s var(--ease);
}
.burger span::before{top:-6px;}
.burger span::after{top:6px;}
body.nav-open .burger span{background:transparent;}
body.nav-open .burger span::before{top:0;transform:rotate(45deg);}
body.nav-open .burger span::after{top:0;transform:rotate(-45deg);}

/* ---------- 通用按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:48px;
  padding:0 26px;
  border-radius:var(--r-btn);
  font-size:15px;
  font-weight:600;
  white-space:nowrap;
  cursor:pointer;
  transition:background .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease),transform .22s var(--ease),box-shadow .22s var(--ease);
}
.btn svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round;}
.btn-primary{background:var(--brand);color:#0A0B0F;}
.btn-primary:hover{background:#ff6f45;color:#0A0B0F;transform:translateY(-2px);box-shadow:0 12px 28px rgba(255,90,43,.28);}
.btn-primary:active{transform:translateY(0);}
.btn-ghost{
  background:transparent;
  border:1px solid var(--line);
  color:var(--text-1);
}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand-soft);transform:translateY(-2px);}
.btn-ghost:active{transform:translateY(0);}
.btn:disabled{opacity:.4;cursor:not-allowed;transform:none;}
.btn-sm{height:40px;padding:0 18px;font-size:14px;}

.text-link{
  display:inline-flex;align-items:center;gap:6px;
  font-size:14px;font-weight:600;color:var(--brand-soft);
  padding-bottom:4px;
  background-image:linear-gradient(var(--brand),var(--brand));
  background-repeat:no-repeat;
  background-size:0% 1px;
  background-position:left bottom;
  transition:background-size .28s var(--ease),color .22s var(--ease);
}
.text-link:hover{color:var(--brand);background-size:100% 1px;}
.text-link svg{width:14px;height:14px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;transition:transform .24s var(--ease);}
.text-link:hover svg{transform:translateX(3px);}

/* ---------- 标签 / 徽章 ---------- */
.tag{
  display:inline-flex;align-items:center;
  height:24px;padding:0 10px;
  border-radius:var(--r-pill);
  font-size:12px;letter-spacing:.06em;line-height:1;
  background:rgba(255,90,43,.12);
  color:var(--brand-soft);
  white-space:nowrap;
}
.tag-accent{background:rgba(53,224,200,.12);color:var(--accent);}
.tag-muted{background:rgba(110,116,132,.16);color:var(--text-2);}

/* ---------- 首屏 ---------- */
.page-hero{
  position:relative;
  padding:52px 0 56px;
  border-bottom:1px solid var(--line);
  overflow:hidden;
}
.page-hero::before{
  content:"";
  position:absolute;inset:0;
  background:url("/assets/images/backpic/back-1.webp") center/cover no-repeat;
  opacity:.16;
  z-index:0;
}
.page-hero::after{
  content:"";
  position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(10,11,15,.6) 0%,rgba(10,11,15,.92) 72%,var(--bg-0) 100%);
  z-index:1;
}
.page-hero .container{position:relative;z-index:2;}

.breadcrumb{
  display:flex;align-items:center;flex-wrap:wrap;gap:8px;
  font-size:13px;color:var(--text-3);
  margin-bottom:26px;
}
.breadcrumb a{color:var(--text-3);}
.breadcrumb a:hover{color:var(--brand-soft);}
.breadcrumb .sep{color:var(--text-3);opacity:.7;}
.breadcrumb .current{color:var(--text-1);}

.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-size:13px;letter-spacing:.16em;
  color:var(--accent);
  margin-bottom:20px;
}
.eyebrow::before{
  content:"";
  width:22px;height:1px;
  background:var(--accent);
  display:inline-block;
}

.page-hero h1{
  font-size:clamp(2.1rem,5vw,4.1rem);
  line-height:1.08;
  font-weight:800;
  letter-spacing:-.02em;
  max-width:16em;
}
.page-hero h1 em{
  font-style:normal;
  color:var(--brand);
}
.hero-lead{
  margin-top:20px;
  font-size:17px;
  color:var(--text-2);
  max-width:44em;
  line-height:1.85;
}
.hero-stats{
  display:flex;
  flex-wrap:wrap;
  gap:0;
  margin-top:36px;
  border-top:1px solid var(--line);
  padding-top:22px;
}
.hero-stat{
  padding-right:38px;
  margin-right:38px;
  border-right:1px solid var(--line);
}
.hero-stat:last-child{border-right:0;margin-right:0;padding-right:0;}
.hero-stat b{
  display:block;
  font-family:var(--font-num);
  font-variant-numeric:tabular-nums;
  font-size:26px;
  font-weight:800;
  line-height:1.2;
  color:var(--text-1);
}
.hero-stat span{
  display:block;
  margin-top:4px;
  font-size:13px;
  color:var(--text-3);
  letter-spacing:.04em;
}

.filter-bar{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:34px;
}
.filter-pill{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:38px;
  padding:0 18px;
  border-radius:var(--r-pill);
  border:1px solid var(--line);
  background:var(--bg-1);
  color:var(--text-2);
  font-size:14px;
  transition:border-color .2s var(--ease),color .2s var(--ease),background .2s var(--ease),transform .2s var(--ease);
}
.filter-pill:hover{border-color:var(--line-hover);color:var(--text-1);transform:translateY(-2px);}
.filter-pill.is-active{
  background:var(--brand);
  border-color:var(--brand);
  color:#0A0B0F;
  font-weight:600;
}

/* ---------- 板块通用 ---------- */
.section{padding:var(--sec-y) 0;}
.section-tight{padding:72px 0;}
.section-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:28px;
  margin-bottom:44px;
}
.section-head h2{
  font-size:clamp(1.65rem,3vw,2.6rem);
  line-height:1.16;
  font-weight:700;
  letter-spacing:-.015em;
}
.section-head p{
  margin-top:12px;
  font-size:15.5px;
  color:var(--text-2);
  max-width:52em;
}
.section-meta{
  flex-shrink:0;
  font-size:13.5px;
  color:var(--text-3);
  letter-spacing:.04em;
}

/* ---------- 编号列表 ---------- */
.topic-list{border-top:1px solid var(--line);}
.topic-item{border-bottom:1px solid var(--line);}
.topic-link{
  display:grid;
  grid-template-columns:112px minmax(0,1fr) 34px;
  gap:26px;
  align-items:start;
  padding:30px 12px 30px 4px;
  border-radius:12px;
  transition:background .22s var(--ease),transform .22s var(--ease);
}
.topic-link:hover{
  background:var(--bg-1);
  transform:translateY(-2px);
}
.topic-num{
  font-family:var(--font-num);
  font-variant-numeric:tabular-nums;
  font-size:44px;
  font-weight:800;
  line-height:.95;
  letter-spacing:-.03em;
  color:var(--brand);
  opacity:.92;
  transition:opacity .22s var(--ease);
}
.topic-link:hover .topic-num{opacity:1;}
.topic-head{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:12px;
  margin-bottom:10px;
}
.topic-title{
  font-size:1.3rem;
  font-weight:600;
  line-height:1.4;
  transition:color .22s var(--ease);
}
.topic-link:hover .topic-title{color:var(--brand-soft);}
.topic-desc{
  font-size:15.5px;
  color:var(--text-2);
  line-height:1.85;
  max-width:62ch;
}
.topic-meta{
  display:block;
  margin-top:12px;
  font-size:13px;
  color:var(--text-3);
  letter-spacing:.03em;
}
.topic-arrow{
  display:grid;place-items:center;
  width:34px;height:34px;
  border-radius:50%;
  border:1px solid var(--line);
  color:var(--text-3);
  font-size:15px;
  transition:border-color .22s var(--ease),color .22s var(--ease),transform .22s var(--ease);
}
.topic-link:hover .topic-arrow{
  border-color:var(--brand);
  color:var(--brand);
  transform:translateX(4px);
}

/* ---------- 数据横条 ---------- */
.stat-strip{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  overflow:hidden;
  margin-top:48px;
}
.stat-cell{
  background:var(--bg-1);
  padding:28px 30px;
  transition:background .22s var(--ease);
}
.stat-cell:hover{background:var(--bg-2);}
.stat-cell b{
  display:block;
  font-family:var(--font-num);
  font-variant-numeric:tabular-nums;
  font-size:30px;
  font-weight:800;
  line-height:1.2;
  color:var(--accent);
}
.stat-cell span{
  display:block;margin-top:6px;
  font-size:13.5px;color:var(--text-3);letter-spacing:.04em;
}

/* ---------- 要点卡片 ---------- */
.feature-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:24px;
}
.feature-card{
  background:var(--bg-1);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  padding:32px 28px;
  transition:border-color .24s var(--ease),transform .24s var(--ease),box-shadow .24s var(--ease),background .24s var(--ease);
}
.feature-card:hover{
  border-color:var(--line-hover);
  transform:translateY(-4px);
  box-shadow:var(--shadow-hover);
  background:var(--bg-2);
}
.feature-icon{
  width:48px;height:48px;
  border-radius:14px;
  display:grid;place-items:center;
  background:rgba(255,90,43,.12);
  border:1px solid rgba(255,90,43,.24);
  margin-bottom:22px;
}
.feature-icon svg{
  width:22px;height:22px;
  fill:none;stroke:var(--brand);stroke-width:1.8;
  stroke-linecap:round;stroke-linejoin:round;
}
.feature-card:nth-child(2) .feature-icon{background:rgba(53,224,200,.1);border-color:rgba(53,224,200,.26);}
.feature-card:nth-child(2) .feature-icon svg{stroke:var(--accent);}
.feature-card:nth-child(3) .feature-icon{background:rgba(167,173,186,.12);border-color:rgba(167,173,186,.24);}
.feature-card:nth-child(3) .feature-icon svg{stroke:var(--text-2);}
.feature-card h3{
  font-size:1.25rem;
  font-weight:600;
  line-height:1.4;
  margin-bottom:12px;
}
.feature-card p{
  font-size:15px;
  color:var(--text-2);
  line-height:1.85;
}

/* ---------- FAQ ---------- */
.faq-list{max-width:920px;}
.faq-item{
  border:1px solid var(--line);
  border-radius:var(--r-card);
  background:var(--bg-1);
  margin-bottom:14px;
  overflow:hidden;
  transition:border-color .24s var(--ease),background .24s var(--ease);
}
.faq-item:hover{border-color:rgba(255,90,43,.28);}
.faq-item.is-open{border-color:var(--line-hover);background:var(--bg-2);}
.faq-q{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  width:100%;
  padding:22px 26px;
  text-align:left;
  font-size:17px;
  font-weight:600;
  line-height:1.6;
  color:var(--text-1);
  transition:color .2s var(--ease);
}
.faq-q:hover{color:var(--brand-soft);}
.faq-plus{
  position:relative;
  width:20px;height:20px;
  flex-shrink:0;
}
.faq-plus::before,.faq-plus::after{
  content:"";
  position:absolute;
  top:50%;left:50%;
  width:14px;height:2px;
  border-radius:2px;
  background:var(--brand);
  transform:translate(-50%,-50%);
  transition:transform .28s var(--ease),opacity .28s var(--ease);
}
.faq-plus::after{transform:translate(-50%,-50%) rotate(90deg);}
.faq-item.is-open .faq-plus::after{transform:translate(-50%,-50%) rotate(0deg);opacity:0;}
.faq-a{
  max-height:0;
  overflow:hidden;
  transition:max-height .34s var(--ease);
}
.faq-a-inner{
  padding:0 26px 24px;
  font-size:15px;
  color:var(--text-2);
  line-height:1.9;
  max-width:62ch;
}

/* ---------- 相关分类 ---------- */
.rel-grid{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:22px;
}
.rel-card{
  display:block;
  background:var(--bg-1);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  overflow:hidden;
  transition:border-color .24s var(--ease),transform .24s var(--ease),box-shadow .24s var(--ease);
}
.rel-card:hover{
  border-color:var(--line-hover);
  transform:translateY(-4px);
  box-shadow:var(--shadow-hover);
}
.rel-figure{
  position:relative;
  aspect-ratio:16/9;
  overflow:hidden;
  background:var(--bg-2);
}
.rel-figure img{
  width:100%;height:100%;
  object-fit:cover;
  transition:transform .5s var(--ease);
}
.rel-card:hover .rel-figure img{transform:scale(1.04);}
.rel-figure::after{
  content:"";
  position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(10,11,15,0) 40%,rgba(10,11,15,.72) 100%);
}
.rel-body{padding:20px 22px 24px;}
.rel-body h3{
  font-size:1.05rem;
  font-weight:600;
  line-height:1.5;
  margin-bottom:8px;
  transition:color .22s var(--ease);
}
.rel-card:hover .rel-body h3{color:var(--brand-soft);}
.rel-body p{
  font-size:14px;
  color:var(--text-2);
  line-height:1.8;
}
.rel-tag{
  position:absolute;
  left:14px;top:14px;
  z-index:2;
}

/* ---------- CTA ---------- */
.cta-band{
  border:1px solid rgba(255,90,43,.34);
  border-radius:var(--r-card);
  background:var(--bg-1);
  padding:48px 52px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:36px;
  position:relative;
  overflow:hidden;
}
.cta-band::before{
  content:"";
  position:absolute;
  left:0;top:0;right:0;
  height:2px;
  background:linear-gradient(90deg,var(--brand),var(--accent));
  opacity:.85;
}
.cta-band h2{
  font-size:clamp(1.5rem,2.6vw,2.2rem);
  line-height:1.2;
  font-weight:700;
  letter-spacing:-.015em;
}
.cta-band p{
  margin-top:12px;
  font-size:15px;
  color:var(--text-2);
}
.cta-actions{display:flex;gap:14px;flex-shrink:0;}

/* ---------- 返回顶部 ---------- */
.to-top{
  position:fixed;
  right:26px;bottom:26px;
  width:46px;height:46px;
  border-radius:50%;
  border:1px solid var(--line);
  background:rgba(18,20,25,.92);
  color:var(--text-2);
  display:grid;place-items:center;
  font-size:16px;
  opacity:0;
  visibility:hidden;
  transform:translateY(10px);
  transition:opacity .26s var(--ease),transform .26s var(--ease),visibility .26s var(--ease),border-color .22s var(--ease),color .22s var(--ease);
  z-index:70;
}
.to-top.is-show{opacity:1;visibility:visible;transform:translateY(0);}
.to-top:hover{border-color:var(--brand);color:var(--brand-soft);}

/* ---------- 页脚 ---------- */
.site-footer{
  background:var(--bg-1);
  border-top:1px solid var(--line);
  margin-top:var(--sec-y);
  padding:68px 0 28px;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr 1.5fr;
  gap:44px;
}
.footer-brand{
  display:flex;
  align-items:center;
  gap:10px;
  margin-bottom:16px;
}
.footer-brand .brand-name{font-size:16px;}
.footer-about{
  font-size:14px;
  color:var(--text-2);
  line-height:1.85;
  max-width:34ch;
}
.footer-col h4{
  font-size:13px;
  letter-spacing:.12em;
  font-weight:600;
  color:var(--text-3);
  margin-bottom:18px;
}
.footer-col ul li{margin-bottom:12px;}
.footer-col ul li a{
  font-size:14.5px;
  color:var(--text-2);
}
.footer-col ul li a:hover{color:var(--brand-soft);}
.footer-contact p{
  font-size:14px;
  color:var(--text-2);
  line-height:1.85;
  margin-bottom:12px;
}
.footer-contact .muted{color:var(--text-3);font-size:13px;}
.footer-bottom{
  margin-top:52px;
  padding-top:22px;
  border-top:1px solid var(--line);
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:12px;
  font-size:13px;
  color:var(--text-3);
}

/* ---------- 入场动效 ---------- */
body.has-js .reveal{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .55s var(--ease),transform .55s var(--ease);
}
body.has-js .reveal.is-visible{opacity:1;transform:none;}

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

/* ---------- 响应式 ---------- */
@media (min-width:1440px){
  :root{--container:1360px;}
}

@media (max-width:1200px){
  .footer-grid{grid-template-columns:1.5fr 1fr 1fr 1.3fr;gap:32px;}
}

@media (max-width:1100px){
  :root{--gutter:24px;--sec-y:80px;}
  .nav-wrap{flex-wrap:wrap;height:auto;padding:12px 0;gap:12px 20px;}
  .search{order:3;flex:1 1 100%;max-width:none;}
  .burger{display:inline-flex;}
  .nav-links{
    display:none;
    position:absolute;
    top:100%;left:0;right:0;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:10px 24px 18px;
    background:var(--bg-1);
    border-bottom:1px solid var(--line);
    box-shadow:0 18px 40px rgba(0,0,0,.45);
  }
  body.nav-open .nav-links{display:flex;}
  .nav-link{
    justify-content:flex-start;
    padding:14px 4px;
    border-radius:0;
    border-bottom:1px solid var(--line);
  }
  .nav-link:last-child{border-bottom:0;}
  .nav-link.is-active{background:transparent;color:var(--brand-soft);}
  .rel-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .footer-grid{grid-template-columns:1fr 1fr;gap:36px;}
}

@media (max-width:992px){
  :root{--sec-y:72px;}
  .feature-grid{grid-template-columns:1fr;}
  .stat-strip{grid-template-columns:1fr;}
  .topic-link{grid-template-columns:84px minmax(0,1fr);gap:20px;}
  .topic-arrow{display:none;}
  .section-head{flex-direction:column;align-items:flex-start;gap:16px;margin-bottom:34px;}
  .cta-band{flex-direction:column;align-items:flex-start;padding:40px 32px;}
  .cta-actions{width:100%;}
}

@media (max-width:768px){
  :root{--gutter:18px;--sec-y:56px;}
  body{font-size:15.5px;}
  .brand-name{font-size:16px;}
  .brand-name-tail{display:none;}
  .page-hero{padding:36px 0 42px;}
  .hero-stats{padding-top:18px;margin-top:28px;}
  .hero-stat{padding-right:22px;margin-right:22px;}
  .hero-stat b{font-size:22px;}
  .topic-link{grid-template-columns:60px minmax(0,1fr);gap:16px;padding:24px 4px;}
  .topic-num{font-size:32px;}
  .topic-title{font-size:1.1rem;}
  .topic-desc{font-size:14.5px;}
  .faq-q{padding:18px 18px;font-size:15.5px;}
  .faq-a-inner{padding:0 18px 20px;font-size:14.5px;}
  .stat-cell{padding:22px 22px;}
  .cta-band{padding:32px 22px;}
  .cta-actions{flex-direction:column;}
  .cta-actions .btn{width:100%;}
  .footer-grid{grid-template-columns:1fr;gap:32px;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
  .to-top{right:16px;bottom:16px;width:44px;height:44px;}
}

@media (max-width:520px){
  .rel-grid{grid-template-columns:1fr;}
  .search-form{height:44px;border-radius:12px;padding-left:38px;}
  .search-key{display:none;}
  .search-btn{height:32px;padding:0 14px;font-size:13px;}
  .filter-pill{min-height:36px;padding:0 14px;font-size:13.5px;}
  .hero-stat{padding-right:16px;margin-right:16px;}
  .hero-stat b{font-size:20px;}
  .hero-stat span{font-size:12px;}
}

/* roulang page: category2 */
:root{
  --bg-0:#0A0B0F;
  --bg-1:#121419;
  --bg-2:#1A1D24;
  --line:#262A33;
  --brand:#FF5A2B;
  --brand-soft:#FFB49B;
  --accent:#35E0C8;
  --text-1:#F4F5F8;
  --text-2:#A7ADBA;
  --text-3:#6E7484;
  --ok:#3ED598;
  --warn:#FFB020;
  --err:#FF4D4F;
  --r-card:16px;
  --r-img:12px;
  --r-btn:10px;
  --r-pill:999px;
  --r-input:12px;
  --shadow-hover:0 18px 40px rgba(0,0,0,.45);
  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:220ms;
  --container:1240px;
  --gap:24px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg-0);
  color:var(--text-1);
  font-family:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  font-size:16.5px;
  line-height:1.85;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border-radius:var(--r-img)}
a{color:inherit;text-decoration:none;transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),background-color var(--dur) var(--ease)}
button{font:inherit;color:inherit;cursor:pointer}
input{font:inherit}
h1,h2,h3,h4{margin:0;font-weight:700;line-height:1.2;letter-spacing:-.01em}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:4px}
::selection{background:rgba(255,90,43,.32);color:#fff}
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 32px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.num{font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(10,11,15,.86);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
  transition:background-color var(--dur) var(--ease);
}
.nav-wrap{display:flex;align-items:center;gap:28px;height:72px;transition:height var(--dur) var(--ease)}
.site-header.is-scrolled{background:rgba(10,11,15,.94);box-shadow:0 10px 30px rgba(0,0,0,.35)}
.site-header.is-scrolled .nav-wrap{height:60px}
.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.brand-mark{
  display:flex;align-items:center;justify-content:center;
  width:38px;height:38px;border-radius:11px;
  background:var(--brand);color:#0A0B0F;
  font-weight:800;font-size:19px;letter-spacing:-.03em;
}
.brand-text{display:flex;align-items:center;gap:8px}
.brand-name{font-size:17.5px;font-weight:700;letter-spacing:-.01em;white-space:nowrap}
.brand-name-tail{color:var(--text-2);font-weight:600}
.brand-badge{
  font-size:11px;line-height:1;padding:4px 7px;border-radius:6px;
  border:1px solid rgba(53,224,200,.42);color:var(--accent);letter-spacing:.08em;
}
.search{flex:1 1 480px;min-width:220px;max-width:640px;margin:0 auto}
.search-form{
  position:relative;display:flex;align-items:center;
  height:46px;padding:0 5px 0 16px;
  background:var(--bg-1);border:1px solid var(--line);border-radius:var(--r-pill);
  transition:border-color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.search-form:focus-within{border-color:var(--brand);background:var(--bg-2)}
.search-ico{width:18px;height:18px;flex:0 0 auto;fill:none;stroke:var(--text-3);stroke-width:2;stroke-linecap:round}
.search-input{
  flex:1 1 auto;min-width:0;height:100%;
  background:transparent;border:0;outline:none;
  color:var(--text-1);font-size:14px;padding:0 10px;
}
.search-input::placeholder{color:var(--text-3)}
.search-input::-webkit-search-cancel-button{display:none}
.search-key{
  font-size:11px;color:var(--text-3);border:1px solid var(--line);
  border-radius:6px;padding:2px 6px;margin-right:10px;line-height:1.4;
}
.search-btn{
  height:36px;padding:0 18px;border:0;border-radius:var(--r-pill);
  background:var(--brand);color:#0A0B0F;font-size:13.5px;font-weight:700;
  letter-spacing:.02em;transition:transform var(--dur) var(--ease),filter var(--dur) var(--ease);
}
.search-btn:hover{filter:brightness(1.08);transform:translateY(-1px)}
.search-btn:active{transform:translateY(0)}
.nav-links{display:flex;align-items:center;gap:2px;flex:0 0 auto}
.nav-link{
  padding:8px 12px;border-radius:8px;font-size:14.5px;color:var(--text-2);
  white-space:nowrap;border:1px solid transparent;
}
.nav-link:hover{color:var(--text-1);background:var(--bg-2)}
.nav-link.is-active{color:var(--brand-soft);background:rgba(255,90,43,.10);border-color:rgba(255,90,43,.28)}
.burger{
  display:none;position:relative;width:44px;height:44px;flex:0 0 auto;
  border:1px solid var(--line);border-radius:var(--r-btn);background:var(--bg-1);
}
.burger span,.burger span::before,.burger span::after{
  position:absolute;left:50%;width:18px;height:2px;border-radius:2px;
  background:var(--text-1);transform:translateX(-50%);
  transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease);
}
.burger span{top:50%;margin-top:-1px}
.burger span::before,.burger span::after{content:"";left:0;transform:none}
.burger span::before{top:-6px}
.burger span::after{top:6px}
body.nav-open .burger span{background:transparent}
body.nav-open .burger span::before{transform:translateY(6px) rotate(45deg)}
body.nav-open .burger span::after{transform:translateY(-6px) rotate(-45deg)}
.nav-backdrop{display:none}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line);padding:88px 0 64px}
.hero-bg{
  position:absolute;inset:0;
  background-image:url("/assets/images/backpic/back-2.webp");
  background-size:cover;background-position:center;
  opacity:.30;
}
.hero::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(10,11,15,.62) 0%,rgba(10,11,15,.88) 52%,rgba(10,11,15,.98) 100%);
}
.hero-inner{position:relative;z-index:2}
.breadcrumb{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-3);margin-bottom:26px;flex-wrap:wrap}
.breadcrumb a:hover{color:var(--brand-soft)}
.breadcrumb .sep{color:var(--text-3)}
.breadcrumb .cur{color:var(--text-1)}
.hero-tag{
  display:inline-block;font-size:12px;letter-spacing:.08em;
  padding:5px 11px;border-radius:var(--r-pill);
  background:rgba(53,224,200,.12);color:var(--accent);
  border:1px solid rgba(53,224,200,.28);margin-bottom:22px;
}
.hero h1{
  font-size:clamp(2.5rem,6.4vw,4.4rem);
  line-height:1.05;font-weight:800;letter-spacing:-.02em;max-width:16em;
}
.hero-lead{
  margin-top:20px;max-width:44em;color:var(--text-2);font-size:17px;line-height:1.9;
}
.filter-pills{display:flex;flex-wrap:wrap;gap:10px;margin-top:32px}
.pill{
  display:inline-flex;align-items:center;gap:6px;
  padding:8px 16px;border-radius:var(--r-pill);
  border:1px solid var(--line);background:var(--bg-1);
  color:var(--text-2);font-size:13.5px;min-height:38px;
}
.pill:hover{color:var(--text-1);border-color:rgba(255,90,43,.42)}
.pill.is-active{background:rgba(255,90,43,.14);border-color:rgba(255,90,43,.44);color:var(--brand-soft)}
.hero-stats{
  display:grid;grid-template-columns:repeat(4,1fr);
  gap:0;margin-top:48px;border-top:1px solid var(--line);padding-top:26px;
}
.stat{padding:0 24px;border-left:1px solid var(--line)}
.stat:first-child{padding-left:0;border-left:0}
.stat b{display:block;font-size:28px;font-weight:800;letter-spacing:-.02em}
.stat span{display:block;margin-top:6px;font-size:13px;color:var(--text-3);letter-spacing:.04em}
.stat b em{font-style:normal;color:var(--brand);font-size:16px;margin-left:3px}

/* ---------- sections ---------- */
.section{padding:96px 0}
.section.tight{padding:80px 0}
.section-head{max-width:760px;margin-bottom:52px}
.section-head .eyebrow{
  display:inline-block;font-size:12px;letter-spacing:.1em;color:var(--brand);
  margin-bottom:14px;
}
.section-head h2{font-size:clamp(1.75rem,3.2vw,2.6rem);line-height:1.15}
.section-head p{margin-top:16px;color:var(--text-2);font-size:16px}
.head-row{display:flex;align-items:flex-end;justify-content:space-between;gap:28px;flex-wrap:wrap}
.text-link{
  display:inline-flex;align-items:center;gap:8px;font-size:14.5px;color:var(--brand-soft);
  padding-bottom:2px;border-bottom:1px solid rgba(255,180,155,.36);
}
.text-link:hover{color:var(--brand);border-bottom-color:var(--brand)}

/* ---------- alternating rows ---------- */
.rows{display:flex;flex-direction:column;gap:72px}
.alt-row{
  display:grid;grid-template-columns:1.02fr 1fr;gap:56px;align-items:center;
}
.alt-row.reverse .alt-media{order:2}
.alt-media{
  position:relative;border-radius:var(--r-card);overflow:hidden;
  border:1px solid var(--line);background:var(--bg-1);
  transition:border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.alt-media img{width:100%;aspect-ratio:16/9;object-fit:cover;transition:transform 420ms var(--ease)}
.alt-media:hover{border-color:rgba(255,90,43,.42);box-shadow:var(--shadow-hover);transform:translateY(-4px)}
.alt-media:hover img{transform:scale(1.04)}
.alt-index{
  display:inline-flex;align-items:center;justify-content:center;
  min-width:46px;height:30px;padding:0 10px;border-radius:8px;
  background:rgba(255,90,43,.12);border:1px solid rgba(255,90,43,.30);
  color:var(--brand);font-weight:800;font-size:14px;letter-spacing:.04em;
  margin-bottom:18px;
}
.alt-body h3{font-size:clamp(1.3rem,2vw,1.55rem);line-height:1.35}
.alt-body p{margin-top:16px;color:var(--text-2);line-height:1.9}
.point-list{margin-top:22px;display:flex;flex-direction:column;gap:12px}
.point-list li{
  position:relative;padding-left:24px;font-size:15px;color:var(--text-1);
  line-height:1.7;
}
.point-list li::before{
  content:"";position:absolute;left:4px;top:11px;width:7px;height:7px;border-radius:50%;
  background:var(--accent);box-shadow:0 0 0 3px rgba(53,224,200,.14);
}
.row-meta{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
.chip{
  font-size:12px;letter-spacing:.05em;padding:5px 11px;border-radius:var(--r-pill);
  border:1px solid var(--line);color:var(--text-3);background:var(--bg-1);
}
.chip.hot{border-color:rgba(255,90,43,.36);color:var(--brand-soft);background:rgba(255,90,43,.08)}

/* ---------- cards ---------- */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--gap)}
.card{
  background:var(--bg-2);border:1px solid var(--line);border-radius:var(--r-card);
  padding:30px 28px;
  transition:transform var(--dur) var(--ease),border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.card:hover{transform:translateY(-4px);border-color:rgba(255,90,43,.40);box-shadow:var(--shadow-hover)}
.card .ico{
  width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  background:rgba(53,224,200,.10);border:1px solid rgba(53,224,200,.26);margin-bottom:20px;
}
.card .ico svg{width:22px;height:22px;fill:none;stroke:var(--accent);stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.card h3{font-size:1.24rem;line-height:1.4}
.card p{margin-top:12px;color:var(--text-2);font-size:15px;line-height:1.85}

/* ---------- faq ---------- */
.faq-list{display:flex;flex-direction:column;border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:24px 4px;background:transparent;border:0;text-align:left;
  font-size:17px;font-weight:600;color:var(--text-1);
  transition:color var(--dur) var(--ease);
}
.faq-q:hover{color:var(--brand-soft)}
.faq-q .plus{
  position:relative;flex:0 0 auto;width:22px;height:22px;border-radius:50%;
  border:1px solid var(--line);transition:transform var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.faq-q .plus::before,.faq-q .plus::after{
  content:"";position:absolute;top:50%;left:50%;background:var(--text-2);
  transform:translate(-50%,-50%);border-radius:2px;
}
.faq-q .plus::before{width:10px;height:1.6px}
.faq-q .plus::after{width:1.6px;height:10px}
.faq-item.is-open .faq-q{color:var(--brand-soft)}
.faq-item.is-open .plus{border-color:rgba(255,90,43,.5);transform:rotate(45deg)}
.faq-item.is-open .plus::before,.faq-item.is-open .plus::after{background:var(--brand)}
.faq-a{max-height:0;overflow:hidden;transition:max-height 300ms var(--ease)}
.faq-a p{padding:0 4px 26px;color:var(--text-2);font-size:15.5px;line-height:1.9;max-width:56em}

/* ---------- related categories ---------- */
.cat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--gap)}
.cat-card{
  display:flex;flex-direction:column;gap:12px;min-height:180px;
  padding:26px 24px;border:1px solid var(--line);border-radius:var(--r-card);
  background:var(--bg-1);
  transition:transform var(--dur) var(--ease),border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.cat-card:hover{transform:translateY(-4px);border-color:rgba(255,90,43,.42);box-shadow:var(--shadow-hover);background:var(--bg-2)}
.cat-card .cat-idx{font-size:13px;color:var(--brand);letter-spacing:.08em;font-weight:700}
.cat-card h3{font-size:1.18rem}
.cat-card p{color:var(--text-2);font-size:14.5px;line-height:1.8}
.cat-card .go{margin-top:auto;font-size:13.5px;color:var(--text-3)}
.cat-card:hover .go{color:var(--brand-soft)}
.cat-card.is-current{border-color:rgba(53,224,200,.36);background:var(--bg-2)}
.cat-card.is-current .cat-idx{color:var(--accent)}
.cat-card.is-current .go{color:var(--accent)}

/* ---------- cta ---------- */
.cta-band{
  display:flex;align-items:center;justify-content:space-between;gap:36px;flex-wrap:wrap;
  padding:44px 44px;border-radius:var(--r-card);
  background:var(--bg-1);border:1px solid rgba(255,90,43,.34);
}
.cta-band h2{font-size:clamp(1.5rem,2.6vw,2.1rem);line-height:1.25;max-width:22em}
.cta-band p{margin-top:12px;color:var(--text-2);font-size:15px;max-width:36em}
.cta-actions{display:flex;gap:14px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 26px;border-radius:var(--r-btn);
  font-size:15px;font-weight:700;letter-spacing:.02em;border:1px solid transparent;
  transition:transform var(--dur) var(--ease),filter var(--dur) var(--ease),border-color var(--dur) var(--ease),color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.btn-primary{background:var(--brand);color:#0A0B0F}
.btn-primary:hover{filter:brightness(1.08);transform:translateY(-2px)}
.btn-ghost{border-color:var(--line);color:var(--text-1);background:transparent}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand-soft);transform:translateY(-2px)}
.btn:active{transform:translateY(0)}
.btn[disabled]{opacity:.4;cursor:not-allowed}

/* ---------- back to top ---------- */
.back-top{
  position:fixed;right:24px;bottom:24px;z-index:90;
  width:46px;height:46px;border-radius:50%;
  border:1px solid var(--line);background:rgba(18,20,25,.92);color:var(--text-2);
  display:flex;align-items:center;justify-content:center;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),border-color var(--dur) var(--ease),color var(--dur) var(--ease),visibility var(--dur);
}
.back-top.is-show{opacity:1;visibility:visible;transform:none}
.back-top:hover{border-color:var(--brand);color:var(--brand-soft)}
.back-top svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}

/* ---------- footer ---------- */
.site-footer{border-top:1px solid var(--line);background:var(--bg-1);padding:72px 0 32px;margin-top:96px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.3fr;gap:40px}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:18px}
.footer-brand .brand-mark{width:34px;height:34px;border-radius:10px;font-size:17px}
.footer-brand .brand-name{font-size:16.5px;font-weight:700}
.footer-about{color:var(--text-2);font-size:14.5px;line-height:1.9;max-width:30em}
.footer-col h4{font-size:14px;color:var(--text-1);letter-spacing:.06em;margin-bottom:18px}
.footer-col ul{display:flex;flex-direction:column;gap:12px}
.footer-col a{color:var(--text-2);font-size:14.5px}
.footer-col a:hover{color:var(--brand-soft)}
.footer-contact p{color:var(--text-2);font-size:14.5px;line-height:1.85}
.footer-contact .muted{color:var(--text-3);font-size:13.5px;margin-top:10px}
.footer-bottom{
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  margin-top:56px;padding-top:24px;border-top:1px solid var(--line);
  color:var(--text-3);font-size:13px;
}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity 520ms var(--ease),transform 520ms var(--ease)}
.reveal.is-in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1200px){
  .container{padding:0 28px}
  .alt-row{gap:40px}
  .cat-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr;gap:32px}
  .footer-contact{grid-column:1 / -1}
}
@media (max-width:1024px){
  .container{padding:0 24px}
  .nav-wrap{flex-wrap:wrap;height:auto;padding:12px 0;gap:12px}
  .site-header.is-scrolled .nav-wrap{height:auto}
  .search{order:3;flex:1 0 100%;max-width:none;margin:0}
  .burger{display:block;margin-left:auto}
  .nav-links{
    position:fixed;top:0;right:0;z-index:120;
    height:100vh;width:min(320px,86vw);
    background:var(--bg-1);border-left:1px solid var(--line);
    flex-direction:column;align-items:stretch;gap:6px;
    padding:96px 22px 24px;
    transform:translateX(102%);transition:transform var(--dur) var(--ease);
    overflow-y:auto;
  }
  body.nav-open .nav-links{transform:none}
  .nav-link{font-size:16px;padding:13px 14px}
  .nav-backdrop{
    display:block;position:fixed;inset:0;z-index:110;
    background:rgba(0,0,0,.58);opacity:0;visibility:hidden;
    transition:opacity var(--dur) var(--ease),visibility var(--dur);
  }
  body.nav-open .nav-backdrop{opacity:1;visibility:visible}
  .hero{padding:64px 0 48px}
  .section{padding:72px 0}
  .alt-row{grid-template-columns:1fr;gap:28px}
  .alt-row.reverse .alt-media{order:0}
  .card-grid{grid-template-columns:repeat(2,1fr)}
  .hero-stats{grid-template-columns:repeat(2,1fr);gap:24px 0}
  .stat{padding:0 20px}
  .stat:nth-child(odd){padding-left:0;border-left:0}
  .stat:nth-child(3),.stat:nth-child(4){border-top:1px solid var(--line);padding-top:22px}
  .cta-band{padding:36px 30px}
}
@media (max-width:768px){
  body{font-size:16px}
  .container{padding:0 18px}
  .section,.section.tight{padding:56px 0}
  .rows{gap:56px}
  .card-grid{grid-template-columns:1fr}
  .cat-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:30px}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
  .hero h1{font-size:clamp(2rem,9vw,2.6rem)}
  .hero-lead{font-size:16px}
  .search-key{display:none}
  .cta-band{padding:30px 22px}
  .cta-band h2{font-size:1.45rem}
  .btn{width:100%}
  .cta-actions{width:100%}
  .section-head{margin-bottom:34px}
}
@media (max-width:520px){
  .brand-name{font-size:16px}
  .brand-badge{display:none}
  .search-form{height:44px;border-radius:var(--r-input);padding-left:14px}
  .search-btn{height:34px;padding:0 14px}
  .hero-stats{grid-template-columns:1fr;gap:18px}
  .stat{padding:0 0 0 0;border-left:0}
  .stat + .stat{border-top:1px solid var(--line);padding-top:16px}
  .stat b{font-size:24px}
  .pill{min-height:40px;padding:8px 14px}
  .back-top{right:16px;bottom:16px;width:44px;height:44px}
}
@media (prefers-reduced-motion:reduce){
  *{transition-duration:.01ms !important;animation-duration:.01ms !important;scroll-behavior:auto !important}
  .reveal{opacity:1;transform:none}
}

/* roulang page: category3 */
:root{
  --bg-0:#0A0B0F;
  --bg-1:#121419;
  --bg-2:#1A1D24;
  --line:#262A33;
  --line-hover:rgba(255,90,43,.4);
  --brand:#FF5A2B;
  --brand-soft:#FFB49B;
  --accent:#35E0C8;
  --text-1:#F4F5F8;
  --text-2:#A7ADBA;
  --text-3:#6E7484;
  --ok:#3ED598;
  --warn:#FFB020;
  --err:#FF4D4F;
  --r-card:16px;
  --r-img:12px;
  --r-btn:10px;
  --shadow-hover:0 18px 40px rgba(0,0,0,.45);
  --ease:cubic-bezier(.22,.61,.36,1);
  --container:1240px;
  --gap:24px;
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;
  background:var(--bg-0);
  color:var(--text-1);
  font-family:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  font-size:16px;
  line-height:1.85;
  font-weight:400;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,p,ul,ol,figure{margin:0;}
ul,ol{padding:0;list-style:none;}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;height:auto;}
button,input{font:inherit;color:inherit;}
button{background:none;border:0;cursor:pointer;}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:4px;}
::selection{background:rgba(255,90,43,.28);}

.container{
  width:100%;
  max-width:var(--container);
  margin:0 auto;
  padding:0 32px;
}
@media (min-width:1441px){ .container{max-width:1360px;} }

/* ===== Header ===== */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:rgba(10,11,15,.92);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
  transition:background .22s var(--ease), border-color .22s var(--ease);
}
.nav-wrap{
  display:flex;
  align-items:center;
  gap:22px;
  min-height:72px;
  transition:min-height .22s var(--ease);
}
.site-header.is-scrolled .nav-wrap{min-height:60px;}
.site-header.is-scrolled{box-shadow:0 12px 30px rgba(0,0,0,.35);}

.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto;}
.brand-mark{
  width:36px;height:36px;flex:0 0 auto;
  display:grid;place-items:center;
  border-radius:10px;
  background:var(--brand);
  color:#150A05;
  font-weight:800;
  font-size:18px;
  letter-spacing:0;
  font-variant-numeric:tabular-nums;
}
.brand-text{display:flex;align-items:center;gap:8px;}
.brand-name{font-size:17px;font-weight:700;letter-spacing:.02em;white-space:nowrap;}
.brand-name-tail{color:var(--text-1);}
.brand-badge{
  font-size:11px;
  letter-spacing:.06em;
  padding:2px 7px;
  border-radius:999px;
  color:var(--brand-soft);
  background:rgba(255,90,43,.12);
  border:1px solid rgba(255,90,43,.28);
}
.site-footer .brand-mark{width:32px;height:32px;font-size:16px;}

.search{flex:1 1 auto;display:flex;justify-content:center;min-width:0;}
.search-form{
  position:relative;
  display:flex;
  align-items:center;
  gap:8px;
  width:100%;
  min-width:280px;
  max-width:640px;
  height:48px;
  padding:0 6px 0 16px;
  border-radius:999px;
  background:var(--bg-1);
  border:1px solid var(--line);
  transition:border-color .2s var(--ease), background .2s var(--ease), box-shadow .2s var(--ease);
}
.search-form:focus-within{
  border-color:var(--brand);
  border-width:2px;
  background:var(--bg-2);
}
.search-ico{
  width:18px;height:18px;flex:0 0 auto;
  fill:none;stroke:var(--text-3);stroke-width:1.8;stroke-linecap:round;
}
.search-input{
  flex:1 1 auto;
  min-width:0;
  height:100%;
  border:0;
  background:transparent;
  color:var(--text-1);
  font-size:15px;
  outline:none;
}
.search-input::placeholder{color:var(--text-3);}
.search-input::-webkit-search-cancel-button{display:none;}
.search-key{
  flex:0 0 auto;
  font-size:11px;
  line-height:1;
  padding:4px 7px;
  border-radius:6px;
  color:var(--text-3);
  border:1px solid var(--line);
  background:var(--bg-0);
}
.search-btn{
  flex:0 0 auto;
  height:36px;
  padding:0 18px;
  border-radius:999px;
  background:var(--brand);
  color:#150A05;
  font-size:14px;
  font-weight:700;
  transition:filter .2s var(--ease), transform .2s var(--ease);
}
.search-btn:hover{filter:brightness(1.08);transform:translateY(-1px);}
.search-btn:active{transform:translateY(0);}

.nav-links{display:flex;align-items:center;gap:4px;flex:0 0 auto;}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  height:40px;
  padding:0 12px;
  border-radius:8px;
  font-size:15px;
  color:var(--text-2);
  white-space:nowrap;
  transition:color .2s var(--ease), background .2s var(--ease);
}
.nav-link:hover{color:var(--text-1);background:var(--bg-1);}
.nav-link.is-active{color:var(--brand-soft);}
.nav-link.is-active::after{
  content:"";
  position:absolute;
  left:12px;right:12px;bottom:4px;
  height:2px;
  border-radius:2px;
  background:linear-gradient(90deg,var(--brand),rgba(255,90,43,0));
}

.burger{
  display:none;
  width:44px;height:44px;
  flex:0 0 auto;
  border-radius:10px;
  border:1px solid var(--line);
  align-items:center;
  justify-content:center;
  transition:border-color .2s var(--ease), background .2s var(--ease);
}
.burger:hover{border-color:var(--line-hover);background:var(--bg-1);}
.burger span,
.burger span::before,
.burger span::after{
  display:block;
  width:18px;height:2px;
  border-radius:2px;
  background:var(--text-1);
  transition:transform .22s var(--ease), opacity .22s var(--ease);
}
.burger span{position:relative;}
.burger span::before,.burger span::after{content:"";position:absolute;left:0;}
.burger span::before{top:-6px;}
.burger span::after{top:6px;}
.site-header.nav-open .burger span{background:transparent;}
.site-header.nav-open .burger span::before{transform:translateY(6px) rotate(45deg);}
.site-header.nav-open .burger span::after{transform:translateY(-6px) rotate(-45deg);}

/* ===== Buttons ===== */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:48px;
  padding:0 24px;
  border-radius:var(--r-btn);
  font-size:15px;
  font-weight:600;
  white-space:nowrap;
  border:1px solid transparent;
  transition:transform .2s var(--ease), filter .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease), background .2s var(--ease);
}
.btn-primary{background:var(--brand);color:#150A05;}
.btn-primary:hover{filter:brightness(1.08);transform:translateY(-2px);}
.btn-ghost{border-color:var(--line);color:var(--text-1);background:transparent;}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand-soft);transform:translateY(-2px);}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.4;cursor:not-allowed;transform:none;filter:none;}
.btn-text{
  display:inline-flex;align-items:center;gap:6px;
  color:var(--brand-soft);font-size:15px;font-weight:600;
  padding:6px 0;
}
.btn-text::after{
  content:"→";
  transition:transform .2s var(--ease);
}
.btn-text:hover::after{transform:translateX(4px);}
.btn-text span{
  position:relative;
}
.btn-text span::after{
  content:"";
  position:absolute;left:0;bottom:-2px;
  width:100%;height:1px;
  background:currentColor;
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .24s var(--ease);
}
.btn-text:hover span::after{transform:scaleX(1);}

/* ===== Hero ===== */
.page-hero{
  position:relative;
  border-bottom:1px solid var(--line);
  overflow:hidden;
  background-image:linear-gradient(rgba(10,11,15,.86),rgba(10,11,15,.96)),url("/assets/images/backpic/back-2.webp");
  background-size:cover;
  background-position:center;
}
.hero-inner{
  position:relative;
  padding:64px 0 72px;
  max-width:920px;
}
.breadcrumb{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:8px;
  font-size:13px;
  color:var(--text-3);
  margin-bottom:22px;
}
.breadcrumb a{color:var(--text-3);transition:color .2s var(--ease);}
.breadcrumb a:hover{color:var(--brand-soft);}
.breadcrumb .sep{color:#3A3F4A;}
.breadcrumb .current{color:var(--text-1);}

.page-hero h1{
  font-size:clamp(2.1rem,5vw,3.6rem);
  line-height:1.08;
  font-weight:800;
  letter-spacing:-.02em;
  margin-bottom:20px;
}
.page-hero h1 em{
  font-style:normal;
  color:var(--brand);
}
.hero-lead{
  font-size:17px;
  color:var(--text-2);
  max-width:720px;
  margin-bottom:28px;
}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 12px;
  border-radius:999px;
  font-size:12px;
  letter-spacing:.06em;
  color:var(--brand-soft);
  background:rgba(255,90,43,.12);
  border:1px solid rgba(255,90,43,.24);
}
.tag--accent{
  color:var(--accent);
  background:rgba(53,224,200,.1);
  border-color:rgba(53,224,200,.24);
}

/* ===== Chips ===== */
.chip-row{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  padding:26px 0 0;
}
.chip{
  display:inline-flex;
  align-items:center;
  height:38px;
  padding:0 16px;
  border-radius:999px;
  font-size:14px;
  color:var(--text-2);
  background:var(--bg-1);
  border:1px solid var(--line);
  transition:color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}
.chip:hover{color:var(--text-1);border-color:var(--line-hover);}
.chip.is-active{
  color:#150A05;
  background:var(--brand);
  border-color:var(--brand);
  font-weight:600;
}

/* ===== Sections ===== */
.section{padding:88px 0;}
.section--tight{padding:64px 0;}
.section--alt{background:var(--bg-1);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.section-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:24px;
  margin-bottom:40px;
}
.section-title{
  font-size:clamp(1.6rem,3vw,2.4rem);
  line-height:1.16;
  font-weight:700;
  letter-spacing:-.01em;
}
.section-sub{
  margin-top:12px;
  color:var(--text-2);
  font-size:16px;
  max-width:660px;
}
.section-kicker{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:12px;
  letter-spacing:.14em;
  color:var(--accent);
  margin-bottom:16px;
  text-transform:uppercase;
}
.section-kicker::before{
  content:"";
  width:22px;height:2px;
  border-radius:2px;
  background:var(--accent);
}

/* ===== Big card grid (2 columns) ===== */
.big-grid{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:var(--gap);
}
.vcard{
  display:flex;
  flex-direction:column;
  background:var(--bg-2);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  overflow:hidden;
  transition:transform .24s var(--ease), border-color .24s var(--ease), box-shadow .24s var(--ease);
}
.vcard:hover{
  transform:translateY(-4px);
  border-color:var(--line-hover);
  box-shadow:var(--shadow-hover);
}
.vcard-media{
  position:relative;
  aspect-ratio:16/9;
  overflow:hidden;
  border-bottom:1px solid var(--line);
}
.vcard-media img{
  width:100%;
  height:100%;
  object-fit:cover;
  transition:transform .4s var(--ease);
}
.vcard:hover .vcard-media img{transform:scale(1.04);}
.vcard-media::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(10,11,15,0) 45%,rgba(10,11,15,.72) 100%);
  pointer-events:none;
}
.vcard-index{
  position:absolute;
  top:16px;left:16px;
  z-index:2;
  font-size:24px;
  font-weight:800;
  font-variant-numeric:tabular-nums;
  color:var(--brand);
  letter-spacing:-.03em;
  text-shadow:0 4px 14px rgba(0,0,0,.6);
}
.vcard-body{
  display:flex;
  flex-direction:column;
  gap:12px;
  padding:24px;
}
.vcard-title{
  font-size:1.3rem;
  line-height:1.35;
  font-weight:600;
}
.vcard:hover .vcard-title{color:var(--brand-soft);}
.vcard-text{
  font-size:15px;
  color:var(--text-2);
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
}
.vcard-meta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:14px;
  margin-top:4px;
  padding-top:16px;
  border-top:1px solid var(--line);
  font-size:13px;
  color:var(--text-3);
  font-variant-numeric:tabular-nums;
}
.vcard-meta .dot{width:4px;height:4px;border-radius:50%;background:#3A3F4A;}
.vcard-meta .strong{color:var(--text-2);}

/* ===== Point cards ===== */
.point-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:var(--gap);
}
.point-card{
  padding:28px;
  border-radius:var(--r-card);
  background:var(--bg-1);
  border:1px solid var(--line);
  transition:transform .24s var(--ease), border-color .24s var(--ease), background .24s var(--ease);
}
.point-card:hover{transform:translateY(-4px);border-color:var(--line-hover);background:var(--bg-2);}
.point-ico{
  width:44px;height:44px;
  display:grid;place-items:center;
  border-radius:12px;
  margin-bottom:18px;
  background:rgba(53,224,200,.1);
  border:1px solid rgba(53,224,200,.24);
  color:var(--accent);
}
.point-ico svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;}
.point-title{font-size:1.15rem;font-weight:600;margin-bottom:10px;}
.point-text{font-size:15px;color:var(--text-2);}

/* ===== FAQ ===== */
.faq-list{max-width:920px;}
.faq-item{
  background:var(--bg-1);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  margin-bottom:12px;
  overflow:hidden;
  transition:border-color .22s var(--ease);
}
.faq-item[open]{border-color:rgba(255,90,43,.32);}
.faq-item summary{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  padding:20px 24px;
  cursor:pointer;
  font-size:17px;
  font-weight:600;
  list-style:none;
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{
  content:"＋";
  flex:0 0 auto;
  color:var(--brand);
  font-size:19px;
  line-height:1;
  transition:transform .24s var(--ease);
}
.faq-item[open] summary::after{transform:rotate(45deg);}
.faq-answer{
  padding:0 24px 22px;
  color:var(--text-2);
  font-size:15.5px;
  line-height:1.85;
}

/* ===== Related categories ===== */
.rel-grid{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:var(--gap);
}
.rel-card{
  display:flex;
  flex-direction:column;
  gap:10px;
  padding:24px;
  border-radius:var(--r-card);
  background:var(--bg-1);
  border:1px solid var(--line);
  transition:transform .24s var(--ease), border-color .24s var(--ease);
}
.rel-card:hover{transform:translateY(-4px);border-color:var(--line-hover);}
.rel-num{
  font-size:13px;
  letter-spacing:.1em;
  color:var(--text-3);
  font-variant-numeric:tabular-nums;
}
.rel-title{font-size:1.1rem;font-weight:600;}
.rel-card:hover .rel-title{color:var(--brand-soft);}
.rel-text{font-size:14px;color:var(--text-3);line-height:1.7;}
.rel-card.is-current{border-color:rgba(255,90,43,.45);}
.rel-card.is-current .rel-num{color:var(--brand);}

/* ===== CTA band ===== */
.cta-band{
  border:1px solid rgba(255,90,43,.35);
  border-radius:var(--r-card);
  background:var(--bg-1);
  padding:44px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:32px;
}
.cta-band h2{
  font-size:clamp(1.5rem,2.6vw,2.1rem);
  line-height:1.2;
  font-weight:700;
  letter-spacing:-.01em;
  margin-bottom:10px;
}
.cta-band p{color:var(--text-2);font-size:15.5px;max-width:560px;}
.cta-actions{display:flex;gap:12px;flex:0 0 auto;}

/* ===== Footer ===== */
.site-footer{
  background:var(--bg-0);
  border-top:1px solid var(--line);
  padding:72px 0 28px;
  margin-top:0;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr 1.4fr;
  gap:40px;
}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px;}
.footer-brand .brand-name{font-size:16px;font-weight:700;}
.footer-about{color:var(--text-3);font-size:14px;line-height:1.8;max-width:340px;}
.footer-col h4{
  font-size:13px;
  letter-spacing:.1em;
  color:var(--text-2);
  font-weight:600;
  margin-bottom:16px;
}
.footer-col ul{display:flex;flex-direction:column;gap:10px;}
.footer-col a{
  color:var(--text-3);
  font-size:14px;
  transition:color .2s var(--ease);
}
.footer-col a:hover{color:var(--brand-soft);}
.footer-contact p{color:var(--text-3);font-size:14px;line-height:1.8;}
.footer-contact .muted{margin-top:10px;color:#4E5462;font-size:13px;font-variant-numeric:tabular-nums;}
.footer-bottom{
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:12px;
  margin-top:52px;
  padding-top:22px;
  border-top:1px solid var(--line);
  color:#4E5462;
  font-size:13px;
}

/* ===== Back to top ===== */
.to-top{
  position:fixed;
  right:24px;bottom:24px;
  z-index:70;
  width:46px;height:46px;
  display:grid;place-items:center;
  border-radius:50%;
  background:var(--bg-2);
  border:1px solid var(--line);
  color:var(--text-2);
  opacity:0;
  visibility:hidden;
  transform:translateY(8px);
  transition:opacity .24s var(--ease), transform .24s var(--ease), border-color .2s var(--ease), color .2s var(--ease), visibility .24s;
}
.to-top.is-show{opacity:1;visibility:visible;transform:translateY(0);}
.to-top:hover{border-color:var(--brand);color:var(--brand-soft);}
.to-top svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;}

/* ===== Reveal ===== */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .5s var(--ease), transform .5s var(--ease);}
.reveal.is-visible{opacity:1;transform:none;}

/* ===== Responsive ===== */
@media (max-width:1200px){
  .footer-grid{grid-template-columns:1.5fr 1fr 1fr;row-gap:36px;}
  .footer-contact{grid-column:span 3;}
}
@media (max-width:1024px){
  .nav-wrap{flex-wrap:wrap;padding:12px 0;gap:14px;}
  .search{order:3;flex:1 1 100%;}
  .search-form{max-width:none;}
  .nav-links{
    position:absolute;
    top:100%;left:0;right:0;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:4px;
    padding:14px 24px 20px;
    background:var(--bg-0);
    border-bottom:1px solid var(--line);
  }
  .site-header.nav-open .nav-links{display:flex;}
  .nav-link{height:48px;border-radius:10px;font-size:16px;}
  .nav-link.is-active::after{display:none;}
  .nav-link.is-active{background:rgba(255,90,43,.1);color:var(--brand-soft);}
  .burger{display:inline-flex;margin-left:auto;}
  .section{padding:64px 0;}
  .point-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .rel-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media (max-width:768px){
  .container{padding:0 24px;}
  .hero-inner{padding:44px 0 52px;}
  .big-grid{grid-template-columns:minmax(0,1fr);}
  .point-grid{grid-template-columns:minmax(0,1fr);}
  .section-head{flex-direction:column;align-items:flex-start;gap:14px;}
  .cta-band{flex-direction:column;align-items:flex-start;padding:32px;}
  .cta-actions{width:100%;flex-wrap:wrap;}
  .cta-actions .btn{flex:1 1 auto;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .footer-contact{grid-column:span 2;}
  .section{padding:56px 0;}
}
@media (max-width:520px){
  .container{padding:0 18px;}
  body{font-size:15.5px;}
  .search-form{height:44px;border-radius:12px;padding-left:14px;}
  .search-btn{height:34px;padding:0 14px;font-size:13px;}
  .search-key{display:none;}
  .brand-name{font-size:15.5px;}
  .rel-grid{grid-template-columns:minmax(0,1fr);}
  .footer-grid{grid-template-columns:1fr;}
  .footer-contact{grid-column:span 1;}
  .btn{height:44px;padding:0 18px;}
  .vcard-body{padding:20px;}
  .to-top{right:16px;bottom:16px;}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important;}
  .reveal{opacity:1;transform:none;}
}

/* roulang page: category4 */
:root{
  --bg-0:#0A0B0F;
  --bg-1:#121419;
  --bg-2:#1A1D24;
  --line:#262A33;
  --line-hover:rgba(255,90,43,.4);
  --brand:#FF5A2B;
  --brand-soft:#FFB49B;
  --accent:#35E0C8;
  --text-1:#F4F5F8;
  --text-2:#A7ADBA;
  --text-3:#6E7484;
  --ok:#3ED598;
  --warn:#FFB020;
  --err:#FF4D4F;
  --r-card:16px;
  --r-img:12px;
  --r-btn:10px;
  --r-pill:999px;
  --shadow-hover:0 18px 40px rgba(0,0,0,.45);
  --ease:cubic-bezier(.22,.61,.36,1);
  --t:200ms;
  --container:1240px;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg-0);
  color:var(--text-1);
  font-family:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",Inter,system-ui,-apple-system,sans-serif;
  font-size:16.5px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
button,input{font:inherit;color:inherit}
h1,h2,h3,h4,p,ul,ol,figure{margin:0}
ul,ol{padding:0;list-style:none}
::selection{background:rgba(255,90,43,.28)}

.container{
  width:100%;
  max-width:var(--container);
  margin:0 auto;
  padding:0 32px;
}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:90;
  background:rgba(10,11,15,.86);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
  transition:background var(--t) var(--ease),border-color var(--t) var(--ease);
}
.site-header.is-scrolled{background:rgba(10,11,15,.95);border-bottom-color:#2f3440}
.nav-wrap{
  display:flex;align-items:center;gap:22px;
  height:72px;
  transition:height var(--t) var(--ease);
}
.site-header.is-scrolled .nav-wrap{height:60px}

.brand{display:flex;align-items:center;gap:11px;flex:0 0 auto}
.brand-mark{
  width:36px;height:36px;border-radius:11px;
  display:grid;place-items:center;
  background:var(--brand);color:#12100e;
  font-weight:800;font-size:18px;line-height:1;
  letter-spacing:-.02em;
  box-shadow:0 6px 18px rgba(255,90,43,.28);
}
.brand-text{display:flex;align-items:center;gap:8px}
.brand-name{font-size:17px;font-weight:700;letter-spacing:.01em;white-space:nowrap}
.brand-name-tail{color:var(--text-2);font-weight:600}
.brand-badge{
  font-size:11px;letter-spacing:.08em;
  padding:2px 7px;border-radius:var(--r-pill);
  color:var(--accent);border:1px solid rgba(53,224,200,.35);
  background:rgba(53,224,200,.08);
  line-height:1.6;
}

.search{flex:1 1 auto;min-width:0;max-width:640px;margin:0 auto}
.search-form{
  position:relative;display:flex;align-items:center;gap:8px;
  background:var(--bg-1);
  border:1px solid var(--line);
  border-radius:var(--r-pill);
  padding:5px 5px 5px 16px;
  transition:border-color var(--t) var(--ease),background var(--t) var(--ease);
}
.search-form:focus-within{border:2px solid var(--brand);background:var(--bg-2);padding:4px 4px 4px 15px}
.search-ico{width:18px;height:18px;flex:0 0 auto;stroke:var(--text-3);stroke-width:1.8;fill:none;stroke-linecap:round}
.search-input{
  flex:1 1 auto;min-width:0;
  background:transparent;border:0;outline:none;
  font-size:14.5px;color:var(--text-1);
  height:36px;
}
.search-input::placeholder{color:var(--text-3)}
.search-key{
  flex:0 0 auto;font-size:11px;color:var(--text-3);
  border:1px solid var(--line);border-radius:6px;
  padding:1px 6px;line-height:1.6;
}
.search-btn{
  flex:0 0 auto;
  border:0;cursor:pointer;
  background:var(--brand);color:#12100e;
  font-size:14px;font-weight:700;
  border-radius:var(--r-pill);
  padding:9px 20px;
  transition:filter var(--t) var(--ease),transform var(--t) var(--ease);
}
.search-btn:hover{filter:brightness(1.08);transform:translateY(-1px)}
.search-btn:active{transform:translateY(0)}

.nav-links{display:flex;align-items:center;gap:4px;flex:0 0 auto}
.nav-link{
  position:relative;
  display:inline-flex;align-items:center;
  height:40px;padding:0 12px;border-radius:var(--r-btn);
  font-size:14.5px;color:var(--text-2);
  transition:color var(--t) var(--ease),background var(--t) var(--ease);
  white-space:nowrap;
}
.nav-link::after{
  content:"";position:absolute;left:12px;right:12px;bottom:4px;height:2px;
  background:var(--brand);transform:scaleX(0);transform-origin:left;
  transition:transform var(--t) var(--ease);
}
.nav-link:hover{color:var(--text-1);background:var(--bg-1)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link.is-active{color:var(--text-1);font-weight:600}
.nav-link.is-active::after{transform:scaleX(1)}

.burger{
  display:none;flex:0 0 auto;
  width:44px;height:44px;border-radius:var(--r-btn);
  background:transparent;border:1px solid var(--line);
  cursor:pointer;align-items:center;justify-content:center;
  transition:border-color var(--t) var(--ease);
}
.burger span{position:relative;width:18px;height:2px;background:var(--text-1);display:block;border-radius:2px}
.burger span::before,.burger span::after{content:"";position:absolute;left:0;width:18px;height:2px;background:var(--text-1);border-radius:2px}
.burger span::before{top:-6px}
.burger span::after{top:6px}
.burger:hover{border-color:var(--line-hover)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 24px;
  border-radius:var(--r-btn);
  font-size:15px;font-weight:600;
  cursor:pointer;border:1px solid transparent;
  transition:background var(--t) var(--ease),color var(--t) var(--ease),border-color var(--t) var(--ease),transform var(--t) var(--ease),box-shadow var(--t) var(--ease);
}
.btn-primary{background:var(--brand);color:#12100e}
.btn-primary:hover{filter:brightness(1.08);transform:translateY(-2px);box-shadow:0 12px 26px rgba(255,90,43,.26)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--text-1)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand-soft)}
.btn-text{
  display:inline-flex;align-items:center;gap:6px;
  background:none;border:0;padding:0;cursor:pointer;
  color:var(--brand-soft);font-size:14.5px;font-weight:600;
}
.btn-text::after{content:"";width:16px;height:1px;background:currentColor;transition:width var(--t) var(--ease)}
.btn-text:hover::after{width:26px}
.btn:focus-visible,.nav-link:focus-visible,.footer-col a:focus-visible,.tag:focus-visible,.faq-q:focus-visible{outline:2px solid var(--brand);outline-offset:2px}
.btn:disabled{opacity:.4;cursor:not-allowed;transform:none}

/* ---------- tags / breadcrumb ---------- */
.breadcrumb{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-3);margin-bottom:20px;flex-wrap:wrap}
.breadcrumb a{color:var(--text-3);transition:color var(--t) var(--ease)}
.breadcrumb a:hover{color:var(--brand-soft)}
.breadcrumb .sep{color:#3a3f4b}
.breadcrumb .current{color:var(--text-1)}

.tag{
  display:inline-flex;align-items:center;
  font-size:12px;letter-spacing:.06em;
  padding:4px 11px;border-radius:var(--r-pill);
  background:rgba(255,90,43,.12);color:var(--brand-soft);
  border:1px solid rgba(255,90,43,.22);
}
.tag-accent{background:rgba(53,224,200,.1);color:var(--accent);border-color:rgba(53,224,200,.24)}
.tag-plain{background:var(--bg-2);color:var(--text-2);border-color:var(--line)}

/* ---------- hero ---------- */
.page-hero{position:relative;padding:64px 0 56px;border-bottom:1px solid var(--line);overflow:hidden}
.page-hero::before{
  content:"";position:absolute;inset:0;
  background-image:url('/assets/images/backpic/back-2.webp');
  background-size:cover;background-position:center right;
  opacity:.16;pointer-events:none;
}
.page-hero .container{position:relative;z-index:1}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);gap:52px;align-items:center}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12.5px;letter-spacing:.14em;color:var(--accent);
  margin-bottom:18px;
}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--accent);border-radius:2px}
.page-hero h1{
  font-size:clamp(2.1rem,4.6vw,3.5rem);
  line-height:1.08;font-weight:800;letter-spacing:-.02em;
  max-width:16em;
}
.lede{margin-top:20px;font-size:17px;color:var(--text-2);max-width:34em}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:32px}
.hero-media{position:relative;border-radius:var(--r-card);overflow:hidden;border:1px solid var(--line);aspect-ratio:16/10;background:var(--bg-1)}
.hero-media img{width:100%;height:100%;object-fit:cover}
.hero-media .media-tag{
  position:absolute;left:16px;top:16px;
  font-size:12px;letter-spacing:.06em;
  padding:4px 11px;border-radius:var(--r-pill);
  background:rgba(10,11,15,.72);color:var(--text-1);
  border:1px solid var(--line);
  -webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);
}

.hero-stats{
  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;margin-top:48px;
}
.stat{background:var(--bg-1);padding:20px 22px}
.stat-num{font-size:26px;font-weight:800;font-variant-numeric:tabular-nums;letter-spacing:-.01em;line-height:1.3}
.stat-num span{color:var(--brand);font-size:14px;margin-left:2px;font-weight:700}
.stat-label{font-size:13px;color:var(--text-3);margin-top:4px}

/* ---------- sections ---------- */
.section{padding:96px 0}
.section-alt{background:var(--bg-1);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:44px;flex-wrap:wrap}
.section-head h2{
  font-size:clamp(1.6rem,2.8vw,2.35rem);
  line-height:1.18;font-weight:700;letter-spacing:-.01em;
}
.section-head .sub{margin-top:12px;color:var(--text-2);font-size:15.5px;max-width:44em}
.section-head .side{flex:0 0 auto}

/* ---------- timeline ---------- */
.timeline{position:relative;margin-top:8px}
.timeline::before{
  content:"";position:absolute;left:15px;top:18px;bottom:18px;width:1px;background:var(--line);
}
.step{position:relative;padding-left:56px;margin-bottom:22px}
.step:last-child{margin-bottom:0}
.step-dot{
  position:absolute;left:0;top:14px;
  width:31px;height:31px;border-radius:50%;
  display:grid;place-items:center;
  background:var(--bg-0);border:1px solid var(--line);
  font-size:12px;font-weight:700;color:var(--brand);
  font-variant-numeric:tabular-nums;
  transition:border-color var(--t) var(--ease),box-shadow var(--t) var(--ease);
}
.step:hover .step-dot{border-color:var(--brand);box-shadow:0 0 0 4px rgba(255,90,43,.1)}
.step-card{
  background:var(--bg-1);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  padding:24px 26px;
  transition:transform var(--t) var(--ease),border-color var(--t) var(--ease),box-shadow var(--t) var(--ease);
}
.step:hover .step-card{transform:translateY(-4px);border-color:var(--line-hover);box-shadow:var(--shadow-hover)}
.step-card h3{font-size:1.22rem;font-weight:600;line-height:1.35;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.step-card p{margin-top:10px;color:var(--text-2);font-size:15.5px}
.step-meta{display:flex;gap:16px;flex-wrap:wrap;margin-top:16px;font-size:13px;color:var(--text-3)}
.step-meta b{color:var(--accent);font-weight:600}
.step-media{margin-top:18px;border-radius:var(--r-img);overflow:hidden;border:1px solid var(--line);aspect-ratio:16/6}
.step-media img{width:100%;height:100%;object-fit:cover;transition:transform 260ms var(--ease)}
.step:hover .step-media img{transform:scale(1.03)}

/* ---------- cards ---------- */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{
  background:var(--bg-2);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  padding:28px 26px;
  transition:transform var(--t) var(--ease),border-color var(--t) var(--ease),box-shadow var(--t) var(--ease);
}
.card:hover{transform:translateY(-4px);border-color:var(--line-hover);box-shadow:var(--shadow-hover)}
.card-ico{
  width:44px;height:44px;border-radius:12px;
  display:grid;place-items:center;
  background:rgba(53,224,200,.1);
  border:1px solid rgba(53,224,200,.24);
  color:var(--accent);
  margin-bottom:18px;
}
.card-ico svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.card h3{font-size:1.2rem;font-weight:600;line-height:1.4}
.card p{margin-top:12px;color:var(--text-2);font-size:15px}
.card-list{margin-top:16px;display:grid;gap:8px}
.card-list li{position:relative;padding-left:16px;font-size:14.5px;color:var(--text-2)}
.card-list li::before{content:"";position:absolute;left:0;top:.72em;width:6px;height:1px;background:var(--brand)}

/* ---------- risk list ---------- */
.risk-list{border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;background:var(--bg-1)}
.risk-row{
  display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1.6fr) auto;
  gap:24px;align-items:center;
  padding:22px 26px;
  border-bottom:1px solid var(--line);
  transition:background var(--t) var(--ease),border-color var(--t) var(--ease);
}
.risk-row:last-child{border-bottom:0}
.risk-row:hover{background:var(--bg-2)}
.risk-name{font-size:16px;font-weight:600;display:flex;align-items:center;gap:10px}
.risk-name::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--brand);flex:0 0 auto}
.risk-desc{font-size:14.5px;color:var(--text-2)}
.risk-level{font-size:12.5px;letter-spacing:.06em;color:var(--warn);border:1px solid rgba(255,176,32,.28);background:rgba(255,176,32,.08);border-radius:var(--r-pill);padding:3px 11px;white-space:nowrap}

/* ---------- faq ---------- */
.faq{max-width:900px;margin:0 auto;border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{
  width:100%;background:none;border:0;cursor:pointer;
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:24px 4px;text-align:left;
  font-size:17px;font-weight:600;color:var(--text-1);
  transition:color var(--t) var(--ease);
}
.faq-q:hover{color:var(--brand-soft)}
.faq-q .plus{
  flex:0 0 auto;width:26px;height:26px;position:relative;
  border:1px solid var(--line);border-radius:50%;
  transition:transform var(--t) var(--ease),border-color var(--t) var(--ease);
}
.faq-q .plus::before,.faq-q .plus::after{
  content:"";position:absolute;left:50%;top:50%;background:var(--text-2);transform:translate(-50%,-50%);
}
.faq-q .plus::before{width:11px;height:1px}
.faq-q .plus::after{width:1px;height:11px}
.faq-item.is-open .faq-q .plus{transform:rotate(135deg);border-color:var(--brand)}
.faq-item.is-open .faq-q .plus::before,.faq-item.is-open .faq-q .plus::after{background:var(--brand)}
.faq-a{max-height:0;overflow:hidden;transition:max-height 300ms var(--ease)}
.faq-a p{padding:0 6px 24px;color:var(--text-2);font-size:15.5px;max-width:60em}

/* ---------- related ---------- */
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.rel-card{
  display:block;
  background:var(--bg-1);border:1px solid var(--line);
  border-radius:var(--r-card);padding:24px 22px;
  transition:transform var(--t) var(--ease),border-color var(--t) var(--ease),box-shadow var(--t) var(--ease);
}
.rel-card:hover{transform:translateY(-4px);border-color:var(--line-hover);box-shadow:var(--shadow-hover)}
.rel-card .rel-index{font-size:13px;font-weight:700;color:var(--brand);font-variant-numeric:tabular-nums;letter-spacing:.06em}
.rel-card h3{margin-top:12px;font-size:1.1rem;font-weight:600}
.rel-card p{margin-top:10px;font-size:14px;color:var(--text-2)}
.rel-card .rel-more{margin-top:16px;font-size:13.5px;color:var(--brand-soft)}

/* ---------- CTA ---------- */
.cta-band{
  background:var(--bg-1);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  padding:40px 44px;
  display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;
}
.cta-band h2{font-size:clamp(1.5rem,2.6vw,2.1rem);line-height:1.2;font-weight:700;letter-spacing:-.01em;max-width:20em}
.cta-band p{margin-top:12px;color:var(--text-2);font-size:15.5px;max-width:36em}
.cta-actions{display:flex;gap:14px;flex-wrap:wrap}

/* ---------- footer ---------- */
.site-footer{background:var(--bg-0);border-top:1px solid var(--line);padding:72px 0 28px;margin-top:96px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.4fr;gap:40px}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:18px}
.footer-brand .brand-name{font-size:16.5px;font-weight:700}
.footer-about{color:var(--text-2);font-size:14.5px;max-width:34em}
.footer-col h4{font-size:14px;font-weight:600;letter-spacing:.06em;color:var(--text-1);margin-bottom:18px}
.footer-col ul{display:grid;gap:12px}
.footer-col a{color:var(--text-2);font-size:14.5px;transition:color var(--t) var(--ease),padding-left var(--t) var(--ease)}
.footer-col a:hover{color:var(--brand-soft);padding-left:4px}
.footer-contact p{color:var(--text-2);font-size:14.5px}
.footer-contact .muted{color:var(--text-3);font-size:13.5px;margin-top:12px;font-variant-numeric:tabular-nums}
.footer-bottom{
  margin-top:52px;padding-top:24px;border-top:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:var(--text-3);
}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity 520ms var(--ease),transform 520ms var(--ease)}
.reveal.is-in{opacity:1;transform:none}

/* ---------- back to top ---------- */
.to-top{
  position:fixed;right:24px;bottom:24px;z-index:80;
  width:46px;height:46px;border-radius:50%;
  display:grid;place-items:center;
  background:var(--bg-1);border:1px solid var(--line);color:var(--text-2);
  cursor:pointer;opacity:0;pointer-events:none;
  transition:opacity var(--t) var(--ease),border-color var(--t) var(--ease),color var(--t) var(--ease),transform var(--t) var(--ease);
}
.to-top.is-on{opacity:1;pointer-events:auto}
.to-top:hover{border-color:var(--brand);color:var(--brand-soft);transform:translateY(-2px)}
.to-top svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}

/* ---------- responsive ---------- */
@media (max-width:1200px){
  .container{padding:0 28px}
  .hero-grid{gap:40px}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1.5fr 1fr 1.2fr;gap:32px}
  .footer-contact{grid-column:1 / -1}
}
@media (max-width:1024px){
  .container{padding:0 24px}
  .nav-wrap{flex-wrap:wrap;height:auto;padding:12px 0;gap:12px}
  .site-header.is-scrolled .nav-wrap{height:auto}
  .brand{order:1}
  .burger{display:flex;order:2;margin-left:auto}
  .search{order:3;flex:1 1 100%;max-width:none;margin:0}
  .nav-links{
    position:fixed;top:0;right:0;z-index:95;
    width:min(300px,86vw);height:100vh;
    flex-direction:column;align-items:stretch;gap:2px;
    background:var(--bg-1);border-left:1px solid var(--line);
    padding:92px 20px 28px;
    transform:translateX(102%);
    transition:transform 260ms var(--ease);
    overflow-y:auto;
  }
  .nav-links.is-open{transform:translateX(0)}
  .nav-link{height:auto;padding:14px 16px;font-size:16px}
  .nav-link::after{display:none}
  .nav-link.is-active{background:rgba(255,90,43,.12);color:var(--brand-soft)}
  .hero-grid{grid-template-columns:1fr;gap:32px}
  .hero-media{order:-1;aspect-ratio:16/9}
  .section{padding:76px 0}
  .grid-3{grid-template-columns:1fr 1fr}
  .cta-band{padding:32px 28px}
}
@media (max-width:768px){
  body{font-size:16px}
  .container{padding:0 18px}
  .page-hero{padding:44px 0 40px}
  .lede{font-size:16px}
  .hero-stats{grid-template-columns:repeat(2,1fr)}
  .section{padding:60px 0}
  .grid-3{grid-template-columns:1fr}
  .risk-row{grid-template-columns:1fr;gap:10px;padding:20px}
  .risk-level{justify-self:start}
  .step{padding-left:44px}
  .timeline::before{left:13px}
  .step-dot{width:27px;height:27px;font-size:11px}
  .cta-band{padding:28px 22px}
  .cta-actions{width:100%}
  .cta-actions .btn{flex:1 1 auto}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .site-footer{padding:56px 0 24px;margin-top:64px}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
}
@media (max-width:520px){
  .page-hero h1{font-size:2rem}
  .btn{height:44px;padding:0 18px;font-size:14.5px}
  .search-input{height:34px;font-size:14px}
  .search-key{display:none}
  .grid-4{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .hero-actions .btn{flex:1 1 100%}
  .to-top{right:16px;bottom:16px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important}
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none}
}