/* roulang page: index */
:root{
  --bg-900:#060B14;
  --bg-800:#0B1421;
  --bg-700:#101C2E;
  --brand:#1FB6FF;
  --brand-2:#25E0C8;
  --accent:#FF8A3D;
  --text:#E8F1FA;
  --text-2:#A8BBD0;
  --text-3:#6E8299;
  --glass:rgba(255,255,255,.055);
  --line:rgba(255,255,255,.12);
  --line-soft:rgba(255,255,255,.06);
  --glow-brand:0 0 0 1px rgba(31,182,255,.35),0 10px 34px rgba(31,182,255,.28);
  --glow-accent:0 10px 28px rgba(255,138,61,.35);
  --r-card:18px;
  --r-btn:12px;
  --r-img:14px;
  --r-input:10px;
  --mono:ui-monospace,SFMono-Regular,"JetBrains Mono","Roboto Mono",Menlo,Consolas,monospace;
  --sans:"PingFang SC","HarmonyOS Sans","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;min-height:100vh;background:var(--bg-900);color:var(--text);
  font-family:var(--sans);font-size:16px;line-height:1.85;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
body::before{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);
  background-size:40px 40px;
}
body::after{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background:
    radial-gradient(900px 620px at 10% -10%,rgba(31,182,255,.16),transparent 62%),
    radial-gradient(820px 540px at 102% 8%,rgba(37,224,200,.10),transparent 60%);
}
img{max-width:100%;display:block;border-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}
h1,h2,h3,h4{margin:0;font-weight:700;letter-spacing:-.02em}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px}
::selection{background:rgba(31,182,255,.32);color:#fff}
.wrap{width:100%;max-width:1320px;margin:0 auto;padding:0 24px;position:relative;z-index:2}
.section{padding:100px 0;position:relative;border-top:1px solid var(--line-soft)}
.section.tight{padding:76px 0}
.sec-head{max-width:760px;margin-bottom:46px}
.kicker{
  display:inline-block;font-family:var(--mono);font-size:13px;letter-spacing:.16em;
  color:var(--brand-2);text-transform:uppercase;margin-bottom:14px;
}
.sec-title{font-size:clamp(1.4rem,2.6vw,2rem);line-height:1.25;margin-bottom:14px}
.sec-sub{color:var(--text-2);font-size:15.5px;max-width:640px}

/* ---------- buttons ---------- */
.btn-main{
  display:inline-flex;align-items:center;gap:10px;min-height:48px;
  padding:13px 26px;border:0;border-radius:999px;cursor:pointer;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
  color:#04121F;font-weight:700;font-size:15px;letter-spacing:.01em;
  box-shadow:var(--glow-brand);transition:transform .22s ease,box-shadow .22s ease,filter .22s ease;
}
.btn-main:hover{filter:brightness(1.08);box-shadow:0 0 0 1px rgba(31,182,255,.42),0 16px 40px rgba(31,182,255,.34);transform:translateY(-2px)}
.btn-main:active{transform:translateY(0);box-shadow:0 0 0 1px rgba(31,182,255,.3),0 6px 18px rgba(31,182,255,.24)}
.btn-main .arw{display:inline-block;transition:transform .22s ease}
.btn-main:hover .arw{transform:translateX(3px)}
.btn-ghost{
  display:inline-flex;align-items:center;gap:10px;min-height:48px;
  padding:12px 24px;border-radius:var(--r-btn);cursor:pointer;
  background:var(--glass);border:1px solid rgba(31,182,255,.45);
  color:var(--text);font-size:15px;font-weight:600;
  backdrop-filter:blur(10px);transition:.24s ease;
}
.btn-ghost:hover{background:rgba(31,182,255,.12);border-color:var(--brand);transform:translateY(-1px)}
.btn-acc{background:linear-gradient(135deg,var(--accent),#FFB07A);color:#1A0C02;box-shadow:var(--glow-accent)}
.link-more{color:var(--brand);font-size:14px;position:relative;transition:color .2s ease}
.link-more::after{content:"";position:absolute;left:0;right:0;bottom:-3px;height:1px;background:var(--brand);transform:scaleX(0);transform-origin:left;transition:transform .24s ease}
.link-more:hover{color:var(--brand-2)}
.link-more:hover::after{transform:scaleX(1)}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:1035;
  background:rgba(6,11,20,.72);
  backdrop-filter:blur(16px) saturate(120%);
  border-bottom:1px solid var(--line-soft);
  transition:background .3s ease,box-shadow .3s ease,padding .3s ease;
}
.site-header.scrolled{background:rgba(6,11,20,.92);box-shadow:0 1px 0 rgba(31,182,255,.18),0 14px 40px rgba(0,0,0,.45)}
.nav-grid{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:18px;padding:18px 0;transition:padding .3s ease}
.site-header.scrolled .nav-grid{padding:12px 0}
.nav-side{display:flex;align-items:center;gap:4px}
.nav-left{justify-content:flex-end}
.nav-right{justify-content:flex-start}
.nav-side a{
  position:relative;padding:8px 12px;font-size:14.5px;color:var(--text-2);
  border-radius:8px;transition:color .22s ease;white-space:nowrap;
}
.nav-side a::after{
  content:"";position:absolute;left:12px;right:12px;bottom:2px;height:2px;
  background:linear-gradient(90deg,var(--brand),var(--brand-2));
  transform:scaleX(0);transform-origin:left;transition:transform .24s ease;
}
.nav-side a:hover{color:#fff}
.nav-side a:hover::after{transform:scaleX(1)}
.nav-side a.active{color:#fff}
.nav-side a.active::after{transform:scaleX(1)}
.brand{display:flex;align-items:center;gap:10px;justify-self:center;padding:4px 8px}
.brand-mark{flex:0 0 auto;filter:drop-shadow(0 0 10px rgba(31,182,255,.45))}
.brand-text{display:flex;flex-direction:column;line-height:1.1}
.brand-text b{font-family:var(--mono);font-size:17px;letter-spacing:.02em;color:#fff}
.brand-text small{font-size:11.5px;color:var(--text-3);letter-spacing:.18em}
.nav-cta{
  display:inline-flex;align-items:center;gap:6px;padding:9px 18px;border-radius:999px;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#04121F!important;
  font-weight:700;font-size:14px;box-shadow:0 8px 22px rgba(31,182,255,.28);
  transition:filter .22s ease,transform .22s ease;
}
.nav-cta::after{display:none}
.nav-cta:hover{filter:brightness(1.08);transform:translateY(-1px)}
.nav-toggle{
  display:none;width:44px;height:44px;border-radius:12px;border:1px solid var(--line);
  background:var(--glass);color:var(--text);align-items:center;justify-content:center;
  position:absolute;right:16px;top:50%;transform:translateY(-50%);z-index:1040;
}
.mobile-drawer{
  position:fixed;inset:0;z-index:1050;padding:96px 24px 40px;
  background:rgba(6,11,20,.97);backdrop-filter:blur(18px);
  transform:translateY(-100%);transition:transform .32s ease;overflow-y:auto;
  display:flex;flex-direction:column;
}
body.menu-open .mobile-drawer{transform:translateY(0)}
body.menu-open{overflow:hidden}
.mobile-drawer a.d-link{padding:16px 6px;font-size:16px;color:var(--text-2);border-bottom:1px solid var(--line-soft)}
.mobile-drawer a.d-link.active{color:#fff}
.drawer-close{
  position:absolute;top:26px;right:24px;width:44px;height:44px;border-radius:12px;
  border:1px solid var(--line);background:var(--glass);color:var(--text);
  display:flex;align-items:center;justify-content:center;
}
.drawer-cta{margin-top:26px;display:flex;justify-content:center}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;padding:96px 0 88px;border-bottom:1px solid var(--line-soft)}
.hero::before{
  content:"";position:absolute;inset:0;
  background:url('/assets/images/backpic/back-1.png') center/cover no-repeat;
  opacity:.45;filter:saturate(.82);
}
.hero::after{
  content:"";position:absolute;inset:0;
  background:
    linear-gradient(90deg,rgba(6,11,20,.94) 0%,rgba(6,11,20,.80) 46%,rgba(6,11,20,.62) 100%),
    radial-gradient(720px 480px at 86% 26%,rgba(31,182,255,.22),transparent 66%);
}
.hero-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:24px;align-items:center}
.hero-copy{grid-column:span 6}
.hero-panel-wrap{grid-column:8 / span 5}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;padding:7px 14px;border-radius:999px;
  background:rgba(31,182,255,.10);border:1px solid rgba(31,182,255,.28);
  font-size:12.5px;letter-spacing:.06em;color:var(--brand-2);margin-bottom:22px;
}
.hero h1{
  font-size:clamp(1.9rem,4.2vw,3.1rem);line-height:1.15;letter-spacing:-.02em;
  margin-bottom:20px;
}
.hero h1 em{font-style:normal;background:linear-gradient(120deg,var(--brand),var(--brand-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .lead{font-size:16.5px;color:var(--text-2);max-width:520px;margin-bottom:28px}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:18px}
.hero-note{font-size:12.5px;color:var(--text-3);letter-spacing:.02em}
.hero-panel{
  position:relative;background:var(--glass);border:1px solid var(--line);
  border-radius:var(--r-card);padding:26px;backdrop-filter:blur(16px) saturate(120%);
  box-shadow:0 26px 64px rgba(0,0,0,.48);
}
.hero-panel::before{
  content:"";position:absolute;top:-1px;right:26px;width:56px;height:3px;
  background:linear-gradient(90deg,var(--brand),transparent);border-radius:2px;
}
.panel-top{display:flex;align-items:center;gap:10px;padding-bottom:16px;border-bottom:1px solid var(--line-soft);margin-bottom:8px}
.dot{width:8px;height:8px;border-radius:50%;background:var(--brand-2);box-shadow:0 0 0 4px rgba(37,224,200,.16);animation:pulse 2.4s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.42;transform:scale(.86)}}
.panel-top strong{font-size:14px;letter-spacing:.02em}
.panel-top span{margin-left:auto;font-family:var(--mono);font-size:12px;color:var(--accent)}
.panel-row{display:flex;justify-content:space-between;gap:14px;padding:13px 0;border-bottom:1px dashed rgba(255,255,255,.10);font-size:14px}
.panel-row:last-of-type{border-bottom:0}
.panel-row .k{color:var(--text-3)}
.panel-row .v{font-family:var(--mono);color:var(--text);text-align:right}
.panel-row .v.acc{color:var(--accent)}
.panel-btn{margin-top:16px;width:100%;justify-content:center}

/* ---------- stats ---------- */
.stats{background:var(--bg-800);border-bottom:1px solid var(--line-soft);position:relative;z-index:2}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr)}
.stat{padding:36px 22px;text-align:center;border-right:1px solid var(--line-soft)}
.stat:last-child{border-right:0}
.stat b{display:block;font-family:var(--mono);font-size:clamp(1.6rem,3vw,2.3rem);line-height:1.1;color:var(--accent);letter-spacing:-.02em}
.stat span{display:block;margin-top:8px;font-size:13px;color:var(--text-2);letter-spacing:.02em}
.stat-bar{padding:14px 0 18px;text-align:center;font-size:12.5px;color:var(--text-3);border-top:1px solid var(--line-soft)}

/* ---------- cards ---------- */
.card-g{
  position:relative;background:var(--glass);border:1px solid var(--line);
  border-radius:var(--r-card);padding:24px;backdrop-filter:blur(16px) saturate(120%);
  transition:transform .28s ease,border-color .28s ease,box-shadow .28s ease;overflow:hidden;
}
.card-g::before{
  content:"";position:absolute;top:-40px;left:-40px;width:120px;height:120px;
  background:radial-gradient(circle,rgba(31,182,255,.28),transparent 70%);
  opacity:0;transition:opacity .3s ease;pointer-events:none;
}
.card-g:hover{transform:translateY(-4px);border-color:rgba(31,182,255,.30);box-shadow:0 20px 50px rgba(0,0,0,.42)}
.card-g:hover::before{opacity:1}
.tag{
  display:inline-flex;align-items:center;padding:4px 12px;border-radius:999px;
  background:rgba(31,182,255,.12);border:1px solid rgba(31,182,255,.24);
  color:var(--brand-2);font-size:12px;letter-spacing:.04em;
}
.tag.acc{background:rgba(255,138,61,.14);border-color:rgba(255,138,61,.32);color:#FFC79B}

/* ---------- features ---------- */
.feature-grid{display:grid;grid-template-columns:1.42fr 1fr;gap:24px;align-items:stretch}
.feature-main{grid-row:span 2;padding:0;display:flex;flex-direction:column}
.feature-media{position:relative;aspect-ratio:16/9;overflow:hidden}
.feature-media img{width:100%;height:100%;object-fit:cover;filter:saturate(.85);transition:transform .4s ease,filter .4s ease}
.feature-main:hover .feature-media img{transform:scale(1.03);filter:saturate(1.05)}
.feature-media::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(6,11,20,.05),rgba(11,20,33,.88))}
.feature-body{padding:26px}
.feature-body h3{font-size:1.25rem;margin-bottom:12px}
.feature-body p{color:var(--text-2);font-size:15px}
.check-list{margin-top:18px;display:grid;gap:10px}
.check-list li{display:flex;gap:10px;font-size:14.5px;color:var(--text-2)}
.check-list i{color:var(--brand-2);margin-top:5px}
.feature-side{display:flex;flex-direction:column;justify-content:center}
.feature-side h3{font-size:1.05rem;margin-bottom:10px}
.feature-side p{color:var(--text-2);font-size:14.5px}
.feature-side .num{font-family:var(--mono);font-size:12px;color:var(--accent);letter-spacing:.14em;margin-bottom:12px;display:block}

/* ---------- demo ---------- */
.demo-bg{background:var(--bg-800);border-top:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft)}
.demo-grid{display:grid;grid-template-columns:minmax(0,.92fr) minmax(0,1.08fr);gap:32px;align-items:start}
.steps{display:grid;gap:10px}
.step-btn{
  display:flex;gap:14px;align-items:flex-start;width:100%;text-align:left;cursor:pointer;
  padding:16px 18px;border-radius:var(--r-btn);background:transparent;
  border:1px solid transparent;border-left:2px solid rgba(255,255,255,.10);
  color:var(--text-2);transition:.25s ease;
}
.step-btn .idx{font-family:var(--mono);font-size:13px;color:var(--text-3);flex:0 0 auto;margin-top:2px}
.step-btn strong{display:block;color:inherit;font-size:15px;font-weight:600;margin-bottom:2px}
.step-btn small{display:block;font-size:13px;color:var(--text-3);line-height:1.6}
.step-btn:hover{background:rgba(255,255,255,.03);color:var(--text)}
.step-btn.active{
  background:var(--glass);border-color:var(--line);border-left:3px solid var(--brand);
  color:var(--text);box-shadow:-2px 0 16px rgba(31,182,255,.30);
  backdrop-filter:blur(14px);
}
.step-btn.active .idx{color:var(--brand)}
.demo-panel{display:none}
.demo-panel.active{display:block;animation:fade .3s ease}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.demo-media{position:relative;border-radius:var(--r-img);overflow:hidden;border:1px solid var(--line);aspect-ratio:16/10}
.demo-media img{width:100%;height:100%;object-fit:cover;filter:saturate(.9);transition:transform .45s ease,filter .45s ease}
.demo-media:hover img{transform:scale(1.03);filter:saturate(1.06)}
.float-note{
  position:absolute;left:16px;right:16px;bottom:16px;padding:13px 16px;
  background:rgba(12,22,36,.74);border:1px solid var(--line);border-radius:var(--r-btn);
  backdrop-filter:blur(14px);font-size:13px;color:var(--text-2);
}
.float-note b{color:var(--text);font-weight:600}

/* ---------- news ---------- */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.news-top{
  display:grid;grid-template-columns:minmax(0,1.08fr) minmax(0,1fr);
  border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;
  background:var(--glass);margin-bottom:24px;transition:border-color .28s ease,transform .28s ease,box-shadow .28s ease;
}
.news-top:hover{border-color:rgba(31,182,255,.30);transform:translateY(-3px);box-shadow:0 22px 54px rgba(0,0,0,.44)}
.news-top-media{position:relative;min-height:320px;overflow:hidden;background:var(--bg-700)}
.news-top-media img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;filter:saturate(.86);transition:transform .45s ease,filter .45s ease}
.news-top:hover .news-top-media img{transform:scale(1.03);filter:saturate(1.05)}
.news-top-media::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(6,11,20,.05),rgba(6,11,20,.42))}
.news-top-body{padding:28px;display:flex;flex-direction:column;justify-content:center;gap:14px}
.news-top-body h3{font-size:1.22rem;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-top-body p{color:var(--text-2);font-size:14.5px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.news-meta{display:flex;align-items:center;gap:14px;font-size:13px;color:var(--text-3);flex-wrap:wrap}
.news-meta time{font-family:var(--mono)}
.news-card{display:flex;flex-direction:column;padding:0;overflow:hidden}
.news-thumb{position:relative;aspect-ratio:16/10;overflow:hidden;background:var(--bg-700);display:block}
.news-thumb img{width:100%;height:100%;object-fit:cover;filter:saturate(.85);transition:transform .4s ease,filter .4s ease}
.news-card:hover .news-thumb img{transform:scale(1.03);filter:saturate(1.05)}
.news-body{padding:22px;display:flex;flex-direction:column;gap:12px;flex:1}
.news-body h3{font-size:1.02rem;line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-body h3 a:hover{color:var(--brand)}
.news-body .sum{color:var(--text-2);font-size:14px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:12px;padding-top:8px}
.news-empty{
  display:flex;flex-direction:column;align-items:center;gap:14px;text-align:center;
  padding:64px 24px;background:var(--glass);border:1px solid var(--line);
  border-radius:var(--r-card);backdrop-filter:blur(16px);
}
.news-empty .ico{
  width:56px;height:56px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  border:1px solid rgba(31,182,255,.34);color:var(--brand);font-size:22px;
  box-shadow:0 0 0 8px rgba(31,182,255,.06);
}
.news-empty p{color:var(--text-2);font-size:15px}

/* ---------- social ---------- */
.quotes{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;align-items:start}
.quote{padding:26px}
.quote:nth-child(2){margin-top:38px}
.quote:nth-child(3){grid-column:1 / -1;margin-top:0}
.quote p{color:var(--text-2);font-size:15px;margin-bottom:16px}
.quote .who{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--text-3)}
.quote .who i{color:var(--brand-2)}
.logo-wall{
  display:grid;grid-template-columns:repeat(4,1fr);gap:1px;margin-top:44px;
  background:var(--line-soft);border:1px solid var(--line-soft);
  border-radius:var(--r-card);overflow:hidden;
}
.logo-wall span{
  background:var(--bg-900);padding:26px 12px;text-align:center;
  color:var(--text-3);font-size:13px;letter-spacing:.06em;
  filter:grayscale(1);opacity:.72;transition:.28s ease;
}
.logo-wall span:hover{color:var(--text);filter:grayscale(0);opacity:1;background:var(--bg-800)}

/* ---------- faq ---------- */
.faq-wrap{max-width:900px}
.faq-item{
  background:var(--glass);border:1px solid var(--line-soft);border-radius:var(--r-img);
  margin-bottom:12px;overflow:hidden;backdrop-filter:blur(12px);
  transition:border-color .25s ease,box-shadow .25s ease;
}
.faq-item.open{border-color:rgba(31,182,255,.32);box-shadow:-3px 0 20px rgba(31,182,255,.16)}
.faq-q{
  width:100%;min-height:56px;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:16px 22px;background:transparent;border:0;cursor:pointer;text-align:left;
  font-size:15.5px;font-weight:600;color:var(--text);transition:color .2s ease;
}
.faq-q:hover{color:var(--brand-2)}
.faq-q .chev{color:var(--brand);transition:transform .25s ease;flex:0 0 auto}
.faq-item.open .chev{transform:rotate(180deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .22s ease}
.faq-item.open .faq-a{max-height:480px}
.faq-a-inner{
  padding:0 22px 20px 22px;margin-left:6px;border-left:3px solid var(--brand);
  color:var(--text-2);font-size:14.5px;
}

/* ---------- cta ---------- */
.cta-band{
  display:flex;align-items:center;justify-content:space-between;gap:28px;flex-wrap:wrap;
  padding:44px;border-radius:var(--r-card);border:1px solid var(--line);
  background:linear-gradient(120deg,rgba(31,182,255,.10),rgba(255,255,255,.04) 46%,rgba(37,224,200,.08));
  backdrop-filter:blur(16px) saturate(120%);
}
.cta-band h2{font-size:clamp(1.25rem,2.2vw,1.7rem);margin-bottom:8px}
.cta-band p{color:var(--text-2);font-size:14.5px}

/* ---------- footer ---------- */
.site-footer{background:var(--bg-800);border-top:1px solid var(--line-soft);padding:72px 0 0;position:relative;z-index:2;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.7fr 1fr 1fr 1.25fr;gap:28px}
.footer-col{border-left:1px solid var(--line-soft);padding-left:24px}
.footer-col:first-child{border-left:0;padding-left:0}
.footer-col h4{font-size:14px;letter-spacing:.06em;color:var(--text);margin-bottom:16px}
.footer-col p{font-size:13.5px;color:var(--text-3);max-width:300px}
.footer-col a{display:block;font-size:13.5px;color:var(--text-2);padding:6px 0;transition:color .2s ease}
.footer-col a:hover{color:var(--brand)}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.footer-brand b{font-family:var(--mono);font-size:16px;color:#fff}
.footer-bottom{
  margin-top:52px;border-top:1px solid var(--line-soft);padding:22px 0 26px;
  font-size:12.5px;color:var(--text-3);display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;
}
.footer-bottom span{letter-spacing:.02em}

/* ---------- mobile bar ---------- */
.mobile-cta{display:none}
@media (max-width:991px){
  .mobile-cta{
    display:flex;position:fixed;left:0;right:0;bottom:0;z-index:1045;
    align-items:center;justify-content:space-between;gap:12px;
    height:56px;padding:0 14px calc(env(safe-area-inset-bottom,0px));
    background:rgba(6,11,20,.88);backdrop-filter:blur(16px);
    border-top:1px solid rgba(31,182,255,.35);
    box-shadow:0 -10px 30px rgba(0,0,0,.5);
  }
  .mobile-cta span{font-size:13px;color:var(--text-2)}
  .mobile-cta .btn-main{min-height:40px;padding:9px 18px;font-size:14px}
  body{padding-bottom:64px}
}

/* ---------- responsive ---------- */
@media (max-width:1200px){
  .hero-copy{grid-column:span 6}
  .hero-panel-wrap{grid-column:8 / span 5}
  .feature-grid{grid-template-columns:1.25fr 1fr}
}
@media (max-width:991px){
  .nav-side{display:none}
  .nav-grid{grid-template-columns:1fr;justify-items:center}
  .nav-toggle{display:flex}
  .hero{padding:68px 0 62px}
  .hero-copy{grid-column:1 / -1}
  .hero-panel-wrap{grid-column:1 / -1}
  .section{padding:72px 0}
  .feature-grid{grid-template-columns:1fr}
  .feature-main{grid-row:auto}
  .demo-grid{grid-template-columns:1fr}
  .news-grid{grid-template-columns:repeat(2,1fr)}
  .news-top{grid-template-columns:1fr}
  .news-top-media{min-height:240px}
  .quotes{grid-template-columns:1fr}
  .quote:nth-child(2){margin-top:0}
  .logo-wall{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px 24px}
  .footer-col{padding-left:0;border-left:0}
  .footer-col:nth-child(2),.footer-col:nth-child(4){padding-left:20px;border-left:1px solid var(--line-soft)}
  .cta-band{padding:32px}
}
@media (max-width:767px){
  .wrap{padding:0 16px}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .stat:nth-child(2){border-right:0}
  .stat{border-bottom:1px solid var(--line-soft)}
  .news-grid{grid-template-columns:1fr}
  .hero-cta .btn-main,.hero-cta .btn-ghost{flex:1 1 auto;justify-content:center}
  .section{padding:56px 0}
  .footer-grid{grid-template-columns:1fr}
  .footer-col:nth-child(2),.footer-col:nth-child(4){padding-left:0;border-left:0}
  .cta-band{padding:26px;flex-direction:column;align-items:flex-start}
}
@media (max-width:520px){
  .brand-text b{font-size:15px}
  .brand-text small{font-size:10.5px;letter-spacing:.12em}
  .hero h1{font-size:1.75rem}
  .stat b{font-size:1.5rem}
  .footer-bottom{flex-direction:column;gap:6px}
}

/* roulang page: article */
:root{
  --bg-900:#060B14;
  --bg-800:#0B1421;
  --bg-700:#101C2E;
  --brand:#1FB6FF;
  --brand-2:#25E0C8;
  --accent:#FF8A3D;
  --text:#E8F1FA;
  --text-2:#A8BBD0;
  --text-3:#6E8299;
  --glass:rgba(255,255,255,.055);
  --glass-2:rgba(255,255,255,.095);
  --line:rgba(255,255,255,.12);
  --line-soft:rgba(255,255,255,.06);
  --glow-brand:0 0 0 1px rgba(31,182,255,.35), 0 10px 34px rgba(31,182,255,.28);
  --glow-accent:0 10px 28px rgba(255,138,61,.35);
  --r-card:18px;
  --r-btn:12px;
  --r-img:14px;
  --r-input:10px;
  --w:1320px;
  --font:"PingFang SC","HarmonyOS Sans","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:ui-monospace,"SFMono-Regular","JetBrains Mono",Menlo,Consolas,monospace;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;
  font-family:var(--font);
  font-size:16px;
  line-height:1.85;
  color:var(--text);
  background-color:var(--bg-900);
  background-image:
    linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.035) 1px, transparent 1px),
    radial-gradient(1200px 620px at 84% -10%, rgba(31,182,255,.14), transparent 62%),
    radial-gradient(900px 520px at -12% 8%, rgba(37,224,200,.10), transparent 58%);
  background-size:40px 40px,40px 40px,100% 100%,100% 100%;
  background-attachment:fixed;
  overflow-x:hidden;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;transition:color .2s ease, border-color .2s ease;}
a:hover{color:var(--brand);}
button{font-family:inherit;}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px;}
.wrap{width:100%;max-width:var(--w);margin:0 auto;padding:0 24px;}
.section{padding:96px 0;position:relative;}
.section + .section{border-top:1px solid var(--line-soft);}
.eyebrow{
  font-family:var(--mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--brand-2);display:inline-flex;align-items:center;gap:10px;margin-bottom:14px;
}
.eyebrow::before{content:"";width:26px;height:2px;background:linear-gradient(90deg,var(--brand),var(--brand-2));border-radius:2px;}
h1,h2,h3,h4{margin:0;color:var(--text);letter-spacing:-.01em;}
p{margin:0;}
::selection{background:rgba(31,182,255,.32);color:#fff;}

/* ============ 导航 ============ */
.site-header{
  position:sticky;top:0;z-index:1000;
  background:rgba(6,11,20,.72);
  border-bottom:1px solid var(--line-soft);
  backdrop-filter:blur(16px) saturate(120%);
  -webkit-backdrop-filter:blur(16px) saturate(120%);
  transition:background .25s ease,padding .25s ease,box-shadow .25s ease;
}
.site-header.scrolled{background:rgba(6,11,20,.92);box-shadow:0 1px 0 rgba(31,182,255,.22),0 12px 30px rgba(0,0,0,.4);}
.site-header .wrap{padding-top:14px;padding-bottom:14px;transition:padding .25s ease;position:relative;}
.site-header.scrolled .wrap{padding-top:8px;padding-bottom:8px;}
.nav-grid{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:20px;}
.nav-side{display:flex;align-items:center;gap:6px;}
.nav-left{justify-content:flex-end;}
.nav-right{justify-content:flex-start;}
.nav-side a{
  position:relative;font-size:14.5px;color:var(--text-2);padding:9px 12px;border-radius:10px;
  white-space:nowrap;transition:color .2s ease,background .2s ease;
}
.nav-side a::after{
  content:"";position:absolute;left:12px;right:12px;bottom:4px;height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--brand),var(--brand-2));
  transform:scaleX(0);transform-origin:left;transition:transform .24s ease;
}
.nav-side a:hover{color:#fff;background:rgba(255,255,255,.05);}
.nav-side a:hover::after{transform:scaleX(1);}
.nav-side a.active{color:#fff;}
.nav-side a.active::after{transform:scaleX(1);box-shadow:0 0 12px rgba(31,182,255,.6);}
.nav-cta{
  color:#04121E !important;font-weight:700;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
  padding:10px 18px !important;border-radius:999px;
  box-shadow:0 8px 22px rgba(31,182,255,.28);
}
.nav-cta:hover{filter:brightness(1.08);transform:translateY(-1px);}
.nav-cta::after{display:none !important;}
.brand{display:inline-flex;align-items:center;gap:12px;justify-self:center;padding:4px 10px;border-radius:14px;}
.brand-mark{filter:drop-shadow(0 0 10px rgba(31,182,255,.45));flex:0 0 auto;}
.brand-text{display:flex;flex-direction:column;line-height:1.12;}
.brand-text b{font-family:var(--mono);font-size:17px;letter-spacing:.02em;color:#fff;text-transform:lowercase;}
.brand-text small{font-size:11.5px;color:var(--text-3);letter-spacing:.14em;}
.nav-toggle{
  display:none;position:absolute;right:24px;top:50%;transform:translateY(-50%);
  width:44px;height:44px;align-items:center;justify-content:center;
  border-radius:12px;border:1px solid var(--line);background:var(--glass);color:var(--text);
  font-size:17px;cursor:pointer;
}
.nav-toggle:hover{border-color:rgba(31,182,255,.5);color:var(--brand);}

/* ============ 面包屑 ============ */
.crumb-bar{
  border-bottom:1px solid var(--line-soft);
  background:linear-gradient(180deg,rgba(11,20,33,.7),rgba(6,11,20,0));
  padding:18px 0;
}
.crumb{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:13px;color:var(--text-3);letter-spacing:.02em;}
.crumb a{color:var(--text-2);}
.crumb a:hover{color:var(--brand);}
.crumb .sep{color:rgba(255,255,255,.2);}
.crumb .cur{color:var(--text-2);max-width:52ch;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}

/* ============ 文章头 ============ */
.article-hero{padding:56px 0 34px;position:relative;}
.article-hero::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(31,182,255,.35),transparent);
}
.article-head{max-width:860px;}
.chip-row{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:18px;}
.chip{
  display:inline-flex;align-items:center;gap:7px;
  font-size:12.5px;letter-spacing:.06em;color:var(--brand-2);
  background:rgba(31,182,255,.12);border:1px solid rgba(31,182,255,.3);
  padding:5px 12px;border-radius:999px;
}
.chip .dot{width:6px;height:6px;border-radius:50%;background:var(--accent);box-shadow:0 0 10px var(--accent);animation:pulse 2.4s ease-in-out infinite;}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1);}50%{opacity:.45;transform:scale(.8);}}
.chip.muted{color:var(--text-2);background:var(--glass);border-color:var(--line);}
.article-hero h1{
  font-size:clamp(1.9rem,4.2vw,3.1rem);
  line-height:1.15;font-weight:700;letter-spacing:-.02em;
  margin-bottom:18px;text-wrap:balance;
}
.article-hero .lead{font-size:16.5px;line-height:1.9;color:var(--text-2);max-width:74ch;}
.meta-row{
  display:flex;flex-wrap:wrap;align-items:center;gap:16px;
  margin-top:24px;font-size:13.5px;color:var(--text-3);
}
.meta-row .item{display:inline-flex;align-items:center;gap:8px;}
.meta-row .item i{color:var(--brand);}
.meta-row .bar{width:1px;height:14px;background:var(--line);}

/* ============ 正文阅读区 ============ */
.read-wrap{padding:52px 0 24px;}
.article-body{
  max-width:800px;margin:0 auto;
  font-size:17px;line-height:1.95;color:#D9E5F1;
}
.article-body p{margin:0 0 1.25em;}
.article-body h2{
  position:relative;
  font-size:clamp(1.35rem,2.4vw,1.7rem);line-height:1.35;font-weight:700;
  margin:2.1em 0 .8em;padding-left:6px;
}
.article-body h2::before{
  content:"";position:absolute;left:-18px;top:.16em;bottom:.16em;width:4px;border-radius:3px;
  background:linear-gradient(180deg,var(--brand),var(--brand-2));
  box-shadow:0 0 16px rgba(31,182,255,.7);
}
.article-body h3{
  font-size:1rem;font-weight:700;color:var(--brand-2);letter-spacing:.05em;
  margin:1.7em 0 .6em;
}
.article-body h4{font-size:1rem;font-weight:600;margin:1.4em 0 .5em;color:var(--text);}
.article-body ul,.article-body ol{margin:0 0 1.3em;padding-left:1.35em;}
.article-body li{margin-bottom:.5em;}
.article-body li::marker{color:var(--brand);}
.article-body a{color:var(--brand);border-bottom:1px solid rgba(31,182,255,.35);}
.article-body a:hover{color:var(--brand-2);border-bottom-color:var(--brand-2);}
.article-body strong{color:#fff;}
.article-body blockquote{
  margin:1.6em 0;padding:18px 22px;
  background:var(--glass);border-left:3px solid var(--accent);border-radius:12px;
  color:var(--text-2);backdrop-filter:blur(12px);
}
.article-body blockquote p:last-child{margin-bottom:0;}
.article-body img{border-radius:var(--r-img);margin:1.6em 0;width:100%;height:auto;box-shadow:0 16px 40px rgba(0,0,0,.45);}
.article-body figure{margin:1.6em 0;}
.article-body figcaption{font-size:13px;color:var(--text-3);text-align:center;margin-top:10px;}
.article-body table{width:100%;border-collapse:collapse;margin:1.6em 0;font-size:15px;}
.article-body thead th{
  text-align:left;font-weight:600;color:var(--brand-2);font-size:13.5px;letter-spacing:.05em;
  padding:12px 14px;border-bottom:1px solid rgba(31,182,255,.35);
}
.article-body tbody td{padding:12px 14px;border-bottom:1px solid var(--line-soft);color:var(--text-2);}
.article-body tbody tr:hover td{background:rgba(255,255,255,.03);color:var(--text);}
.article-body code{
  font-family:var(--mono);font-size:13.5px;color:var(--brand-2);
  background:rgba(31,182,255,.1);border:1px solid rgba(31,182,255,.22);
  padding:1px 7px;border-radius:6px;
}
.article-body pre{
  background:var(--bg-800);border:1px solid var(--line);border-radius:var(--r-img);
  padding:18px;overflow-x:auto;font-size:14px;line-height:1.7;
}
.article-body pre code{background:none;border:0;padding:0;color:var(--text-2);}
.article-body hr{border:0;height:1px;background:var(--line-soft);margin:2.4em 0;}

/* 空态 */
.empty-state{
  max-width:760px;margin:0 auto;text-align:center;
  background:var(--glass);border:1px solid var(--line);border-radius:var(--r-card);
  padding:56px 28px;backdrop-filter:blur(16px) saturate(120%);
}
.empty-state .icon{
  width:62px;height:62px;margin:0 auto 18px;border-radius:16px;
  display:grid;place-items:center;font-size:22px;color:var(--brand);
  background:rgba(31,182,255,.1);border:1px solid rgba(31,182,255,.28);
}
.empty-state h2{font-size:1.25rem;margin-bottom:10px;}
.empty-state p{color:var(--text-2);font-size:15px;margin-bottom:22px;}

/* ============ 按钮 ============ */
.btn-main,.btn-ghost{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  font-size:15px;font-weight:700;padding:14px 26px;border-radius:999px;
  border:0;cursor:pointer;transition:transform .22s ease,filter .22s ease,box-shadow .22s ease,background .22s ease;
}
.btn-main{
  color:#04121E;background:linear-gradient(135deg,var(--brand),var(--brand-2));
  box-shadow:var(--glow-brand);
}
.btn-main:hover{transform:translateY(-2px);filter:brightness(1.08);box-shadow:0 0 0 1px rgba(31,182,255,.4),0 16px 42px rgba(31,182,255,.36);}
.btn-main:active{transform:translateY(1px);}
.btn-main .ar{transition:transform .22s ease;}
.btn-main:hover .ar{transform:translateX(3px);}
.btn-ghost{
  color:var(--text);background:var(--glass);border:1px solid rgba(31,182,255,.4);
  backdrop-filter:blur(12px);
}
.btn-ghost:hover{background:rgba(31,182,255,.12);color:#fff;transform:translateY(-2px);}
.btn-ghost:active{transform:translateY(1px);}
.btn-small{padding:10px 18px;font-size:14px;border-radius:var(--r-btn);}

/* ============ 文末信息 ============ */
.article-foot{max-width:800px;margin:0 auto;padding-top:34px;}
.foot-box{
  background:var(--glass);border:1px solid var(--line);border-radius:var(--r-card);
  padding:24px;backdrop-filter:blur(16px) saturate(120%);
}
.foot-line{display:flex;flex-wrap:wrap;gap:14px 26px;font-size:13.5px;color:var(--text-2);}
.foot-line .item{display:inline-flex;align-items:center;gap:8px;}
.foot-line .item i{color:var(--brand);}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px;padding-top:18px;border-top:1px solid var(--line-soft);}
.tag{
  font-size:12.5px;color:var(--text-2);background:rgba(255,255,255,.05);
  border:1px solid var(--line);padding:5px 12px;border-radius:999px;
  transition:color .2s ease,border-color .2s ease,background .2s ease;
}
.tag:hover{color:var(--brand);border-color:rgba(31,182,255,.45);background:rgba(31,182,255,.1);}

/* ============ 相关推荐 ============ */
.rec-track{
  display:grid;grid-auto-flow:column;grid-auto-columns:minmax(290px,1fr);
  gap:20px;overflow-x:auto;padding:6px 4px 18px;
  scroll-snap-type:x mandatory;
  scrollbar-width:thin;scrollbar-color:rgba(31,182,255,.5) transparent;
}
.rec-track::-webkit-scrollbar{height:6px;}
.rec-track::-webkit-scrollbar-thumb{background:rgba(31,182,255,.45);border-radius:999px;}
.rec-track::-webkit-scrollbar-track{background:rgba(255,255,255,.05);}
.rec-card{
  scroll-snap-align:start;position:relative;overflow:hidden;
  background:var(--glass);border:1px solid var(--line);border-radius:var(--r-card);
  transition:transform .25s ease,border-color .25s ease,box-shadow .25s ease;
}
.rec-card:hover{transform:translateY(-4px);border-color:rgba(31,182,255,.42);box-shadow:0 18px 40px rgba(0,0,0,.45);}
.rec-card .thumb{aspect-ratio:16/10;overflow:hidden;background:var(--bg-700);}
.rec-card .thumb img{width:100%;height:100%;object-fit:cover;filter:saturate(.85);transition:transform .35s ease,filter .35s ease;}
.rec-card:hover .thumb img{transform:scale(1.03);filter:saturate(1.05) brightness(1.06);}
.rec-card .body{padding:20px;}
.rec-card h3{font-size:1.05rem;line-height:1.45;font-weight:600;margin-bottom:8px;}
.rec-card p{font-size:14px;color:var(--text-2);line-height:1.8;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.rec-card .go{
  display:inline-flex;align-items:center;gap:7px;margin-top:14px;
  font-size:13.5px;color:var(--brand);font-weight:600;
}
.rec-card .go i{transition:transform .22s ease;}
.rec-card:hover .go i{transform:translateX(3px);}

/* ============ 上下篇导航 ============ */
.pager-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;}
.pager{
  display:flex;flex-direction:column;gap:8px;
  background:var(--glass);border:1px solid var(--line);border-radius:var(--r-card);
  padding:22px 24px;transition:border-color .22s ease,transform .22s ease,background .22s ease;
}
.pager:hover{border-color:rgba(31,182,255,.42);transform:translateY(-3px);background:rgba(31,182,255,.07);}
.pager .k{font-size:12.5px;letter-spacing:.1em;color:var(--text-3);text-transform:uppercase;font-family:var(--mono);}
.pager .v{font-size:1.02rem;font-weight:600;color:var(--text);}
.pager.next{align-items:flex-end;text-align:right;}
.pager.next .v{color:var(--brand);}

/* ============ 收束 CTA ============ */
.cta-panel{
  position:relative;overflow:hidden;
  background:linear-gradient(135deg,rgba(31,182,255,.14),rgba(37,224,200,.06));
  border:1px solid rgba(31,182,255,.3);border-radius:22px;
  padding:44px 40px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:26px;
  backdrop-filter:blur(16px) saturate(120%);
}
.cta-panel::after{
  content:"";position:absolute;right:-60px;top:-80px;width:260px;height:260px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,138,61,.22),transparent 68%);
}
.cta-panel h2{font-size:clamp(1.25rem,2.2vw,1.7rem);line-height:1.3;margin-bottom:10px;}
.cta-panel p{color:var(--text-2);font-size:15px;max-width:60ch;}

/* ============ 页脚 ============ */
.site-footer{
  margin-top:20px;border-top:1px solid var(--line-soft);
  background:linear-gradient(180deg,rgba(11,20,33,.9),rgba(6,11,20,1));
  padding:64px 0 26px;
}
.footer-grid{
  display:grid;grid-template-columns:1.5fr 1fr 1fr 1.3fr;gap:34px;
  padding-bottom:34px;border-bottom:1px solid var(--line-soft);
}
.footer-col h4{font-size:13px;letter-spacing:.14em;color:var(--text-3);text-transform:uppercase;margin-bottom:16px;font-family:var(--mono);font-weight:600;}
.footer-col a{display:block;font-size:14.5px;color:var(--text-2);padding:6px 0;}
.footer-col a:hover{color:var(--brand);transform:translateX(2px);}
.footer-col p{font-size:13.5px;color:var(--text-3);line-height:1.85;max-width:38ch;}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:14px;}
.footer-brand b{font-family:var(--mono);font-size:17px;color:#fff;letter-spacing:.02em;}
.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;
  padding-top:22px;font-size:13px;color:var(--text-3);
}

/* ============ 返回顶部 / 移动条 ============ */
.to-top{
  position:fixed;right:22px;bottom:26px;z-index:900;
  width:46px;height:46px;border-radius:14px;display:none;place-items:center;
  background:var(--glass-2);border:1px solid var(--line);color:var(--text);
  backdrop-filter:blur(14px);cursor:pointer;font-size:16px;
  transition:opacity .25s ease,transform .25s ease,border-color .25s ease,color .25s ease;
}
.to-top.show{display:grid;}
.to-top:hover{border-color:rgba(31,182,255,.55);color:var(--brand);transform:translateY(-3px);}
.mobile-bar{
  display:none;position:fixed;left:0;right:0;bottom:0;z-index:950;
  align-items:center;justify-content:space-between;gap:14px;
  padding:10px 16px calc(10px + env(safe-area-inset-bottom));
  background:rgba(6,11,20,.94);border-top:1px solid rgba(31,182,255,.28);
  box-shadow:0 -6px 26px rgba(0,0,0,.5);
  backdrop-filter:blur(16px) saturate(120%);
}
.mobile-bar span{font-size:13.5px;color:var(--text-2);}
.mobile-bar .btn-main{padding:11px 20px;font-size:14px;}

/* ============ 响应式 ============ */
@media (max-width:1199.98px){
  .nav-side a{font-size:14px;padding:9px 9px;}
  .nav-side a::after{left:9px;right:9px;}
}
@media (max-width:991.98px){
  .section{padding:72px 0;}
  .nav-toggle{display:flex;right:16px;}
  .site-header .wrap{padding-top:12px;padding-bottom:12px;}
  .nav-grid{display:flex;align-items:center;justify-content:center;}
  .brand{justify-self:center;}
  .nav-side{display:none;}
  .nav-grid.open{
    position:absolute;top:calc(100% + 10px);left:16px;right:16px;
    flex-direction:column;align-items:stretch;gap:6px;
    padding:18px;border-radius:18px;
    background:rgba(11,20,33,.98);border:1px solid var(--line);
    box-shadow:0 22px 50px rgba(0,0,0,.6);
    backdrop-filter:blur(18px);
  }
  .nav-grid.open .brand{order:-1;margin-bottom:8px;}
  .nav-grid.open .nav-side{display:flex;flex-direction:column;align-items:stretch;gap:4px;}
  .nav-grid.open .nav-side a{padding:13px 14px;font-size:15px;border-radius:12px;min-height:44px;display:flex;align-items:center;}
  .nav-grid.open .nav-side a::after{display:none;}
  .nav-grid.open .nav-cta{justify-content:center;margin-top:8px;}
  body{padding-bottom:72px;}
  .mobile-bar{display:flex;}
  .to-top{bottom:88px;right:16px;}
  .crumb .cur{max-width:100%;white-space:normal;}
  .article-body h2::before{left:-12px;width:3px;}
  .pager-grid{grid-template-columns:1fr;}
  .pager.next{align-items:flex-start;text-align:left;}
  .cta-panel{padding:32px 24px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:26px;}
}
@media (max-width:767.98px){
  .section{padding:56px 0;}
  .wrap{padding:0 16px;}
  .article-hero{padding:38px 0 26px;}
  .read-wrap{padding:38px 0 16px;}
  .article-body{font-size:16.5px;line-height:1.9;}
  .article-body h2{margin:1.8em 0 .7em;}
  .article-body table{display:block;overflow-x:auto;white-space:nowrap;}
  .rec-track{grid-auto-columns:minmax(255px,1fr);}
  .footer-grid{grid-template-columns:1fr;gap:22px;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
}
@media (max-width:575.98px){
  .brand-text small{display:none;}
  .brand-text b{font-size:16px;}
  .cta-panel{padding:26px 18px;}
  .btn-main,.btn-ghost{width:100%;justify-content:center;}
  .mobile-bar .btn-main{width:auto;}
  .foot-box{padding:18px;}
}

/* roulang page: category1 */
:root{
  --bg-900:#060B14;
  --bg-800:#0B1421;
  --bg-700:#101C2E;
  --brand:#1FB6FF;
  --brand-2:#25E0C8;
  --accent:#FF8A3D;
  --text:#E8F1FA;
  --text-2:#A8BBD0;
  --text-3:#6E8299;
  --glass:rgba(255,255,255,.055);
  --glass-2:rgba(255,255,255,.085);
  --line:rgba(255,255,255,.12);
  --line-soft:rgba(255,255,255,.06);
  --glow-brand:0 0 0 1px rgba(31,182,255,.35), 0 10px 34px rgba(31,182,255,.28);
  --glow-accent:0 10px 28px rgba(255,138,61,.35);
  --r-card:18px;
  --r-btn:12px;
  --r-pill:999px;
  --r-img:14px;
  --r-input:10px;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
  --sans:"PingFang SC","HarmonyOS Sans","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --sec-gap:104px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg-900);
  color:var(--text);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.85;
  letter-spacing:.005em;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  z-index:0;
  background-image:
    linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);
  background-size:40px 40px;
  opacity:.75;
}
img{max-width:100%;display:block;border-radius:var(--r-img)}
a{color:inherit;text-decoration:none;transition:color .2s ease}
a:hover{color:var(--brand)}
p{margin:0 0 1.1em}
h1,h2,h3,h4{margin:0 0 .6em;font-weight:700;letter-spacing:-.01em;text-wrap:balance}
ul{margin:0;padding:0;list-style:none}
button{font-family:inherit}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px}
.wrap{
  width:100%;
  max-width:1320px;
  margin:0 auto;
  padding:0 24px;
  position:relative;
  z-index:1;
}
.section{
  padding:var(--sec-gap) 0;
  position:relative;
  border-top:1px solid var(--line-soft);
}
.section:first-of-type{border-top:0}
.section::after{
  content:"";
  position:absolute;
  width:520px;height:520px;
  right:-160px;top:-120px;
  background:radial-gradient(circle,rgba(31,182,255,.14),transparent 68%);
  pointer-events:none;
}
.sec-head{max-width:760px;margin-bottom:44px}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--brand-2);font-family:var(--mono);
  margin-bottom:14px;
}
.eyebrow::before{
  content:"";width:22px;height:1px;background:linear-gradient(90deg,var(--brand),var(--brand-2));
}
h2.sec-title{font-size:clamp(1.4rem,2.6vw,2rem);line-height:1.25}
.sec-sub{color:var(--text-2);font-size:15px;max-width:640px;margin:0}

/* 顶部导航 */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(6,11,20,.68);
  backdrop-filter:blur(16px) saturate(120%);
  -webkit-backdrop-filter:blur(16px) saturate(120%);
  border-bottom:1px solid var(--line-soft);
  transition:background .25s ease,border-color .25s ease;
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;
  background:linear-gradient(90deg,transparent,rgba(31,182,255,.45),transparent);
  opacity:0;transition:opacity .25s ease;
}
.site-header.scrolled{background:rgba(6,11,20,.9);border-color:var(--line)}
.site-header.scrolled::after{opacity:1}
.nav-grid{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:18px;
  min-height:76px;
  transition:min-height .25s ease;
}
.site-header.scrolled .nav-grid{min-height:64px}
.nav-side{display:flex;align-items:center;gap:8px}
.nav-left{justify-content:flex-end}
.nav-right{justify-content:flex-start}
.nav-side a{
  position:relative;
  display:inline-flex;align-items:center;
  padding:10px 12px;
  min-height:44px;
  font-size:14.5px;
  color:var(--text-2);
}
.nav-side a::after{
  content:"";position:absolute;left:12px;right:12px;bottom:6px;height:2px;
  border-radius:2px;
  background:linear-gradient(90deg,var(--brand),var(--brand-2));
  transform:scaleX(0);transform-origin:left;
  transition:transform .22s ease;
}
.nav-side a:hover{color:#fff}
.nav-side a:hover::after{transform:scaleX(1)}
.nav-side a.active{color:#fff}
.nav-side a.active::after{transform:scaleX(1);box-shadow:0 0 12px rgba(31,182,255,.7)}
.brand{
  display:flex;align-items:center;gap:10px;
  padding:8px 14px;border-radius:var(--r-pill);
  background:var(--glass);
  border:1px solid var(--line);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  white-space:nowrap;
}
.brand:hover{color:#fff;border-color:rgba(31,182,255,.4)}
.brand-mark{flex:0 0 auto;filter:drop-shadow(0 0 8px rgba(31,182,255,.5))}
.brand-text{display:flex;flex-direction:column;line-height:1.1}
.brand-text b{font-family:var(--mono);font-size:15px;letter-spacing:.02em;color:#fff}
.brand-text small{font-size:11px;color:var(--text-3);letter-spacing:.06em}
.nav-cta{
  border-radius:var(--r-pill)!important;
  background:linear-gradient(120deg,var(--brand),var(--brand-2));
  color:#04121C!important;
  font-weight:600;
  padding:10px 20px!important;
  box-shadow:var(--glow-brand);
}
.nav-cta::after{display:none}
.nav-cta:hover{box-shadow:0 0 0 1px rgba(31,182,255,.5),0 10px 40px rgba(31,182,255,.4)}
.nav-toggle{
  display:none;
  position:absolute;right:20px;top:50%;transform:translateY(-50%);
  width:46px;height:46px;
  align-items:center;justify-content:center;
  background:var(--glass);border:1px solid var(--line);
  color:var(--text);border-radius:12px;font-size:17px;
  cursor:pointer;
}
.nav-toggle:hover{border-color:rgba(31,182,255,.45);color:#fff}
.nav-drawer{
  display:none;
  border-top:1px solid var(--line-soft);
  background:rgba(8,15,26,.98);
  padding:18px 0 26px;
}
.nav-drawer.open{display:block}
.drawer-label{
  display:block;font-family:var(--mono);font-size:11px;letter-spacing:.16em;
  color:var(--text-3);margin:10px 0 4px;
}
.nav-drawer nav a{
  display:flex;align-items:center;justify-content:space-between;
  min-height:48px;padding:0 4px;
  border-bottom:1px solid var(--line-soft);
  color:var(--text-2);font-size:15px;
}
.nav-drawer nav a.active{color:var(--brand)}
.nav-drawer nav a:hover{color:#fff}
.drawer-cta{
  margin-top:18px;
  justify-content:center!important;
  border:0!important;
  border-radius:var(--r-pill)!important;
  background:linear-gradient(120deg,var(--brand),var(--brand-2));
  color:#04121C!important;font-weight:600;
}

/* 面包屑 */
.crumb{
  display:flex;align-items:center;gap:10px;
  font-size:13px;color:var(--text-3);
  margin-bottom:22px;flex-wrap:wrap;
}
.crumb a{color:var(--text-3)}
.crumb a:hover{color:var(--brand)}
.crumb .sp{width:1px;height:12px;background:var(--line);display:inline-block}
.crumb .now{color:var(--text-2)}

/* 分类 Hero */
.cat-hero{
  position:relative;
  padding:64px 0 76px;
  background-image:
    linear-gradient(100deg,rgba(6,11,20,.92) 0%,rgba(6,11,20,.78) 46%,rgba(6,11,20,.6) 100%),
    url("/assets/images/backpic/back-1.png");
  background-size:cover;
  background-position:center 30%;
  border-bottom:1px solid var(--line-soft);
  overflow:hidden;
}
.cat-hero::after{
  content:"";
  position:absolute;left:-100px;top:-140px;width:640px;height:640px;
  background:radial-gradient(circle,rgba(31,182,255,.2),transparent 65%);
  pointer-events:none;
}
.cat-hero .wrap{position:relative;z-index:2}
.cat-hero h1{
  font-size:clamp(1.9rem,3.6vw,2.7rem);
  line-height:1.18;
  letter-spacing:-.02em;
  max-width:860px;
  margin-bottom:18px;
}
.cat-hero h1 em{
  font-style:normal;
  background:linear-gradient(100deg,var(--brand),var(--brand-2));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.cat-hero .lead{
  color:var(--text-2);font-size:16.5px;max-width:660px;margin-bottom:26px;
}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;align-items:center}
.btn{
  display:inline-flex;align-items:center;gap:10px;
  min-height:48px;padding:0 24px;
  border-radius:var(--r-btn);
  font-size:15px;font-weight:600;
  border:1px solid transparent;
  cursor:pointer;
  transition:transform .2s ease,box-shadow .25s ease,background .25s ease,color .2s ease,border-color .2s ease;
}
.btn i{font-size:13px;transition:transform .2s ease}
.btn-primary{
  background:linear-gradient(120deg,var(--brand),var(--brand-2));
  color:#04121C;
  border-radius:var(--r-pill);
  box-shadow:var(--glow-accent);
}
.btn-primary:hover{color:#04121C;filter:brightness(1.08);box-shadow:0 0 0 1px rgba(31,182,255,.5),0 12px 40px rgba(31,182,255,.42)}
.btn-primary:hover i{transform:translateX(3px)}
.btn-primary:active{transform:translateY(1px)}
.btn-ghost{
  background:var(--glass);
  border-color:rgba(31,182,255,.45);
  color:var(--text);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
}
.btn-ghost:hover{background:rgba(31,182,255,.12);color:#fff}
.btn-ghost:active{transform:translateY(1px)}
.hero-note{
  margin-top:16px;font-size:12.5px;color:var(--text-3);letter-spacing:.02em;
  display:flex;align-items:center;gap:8px;
}
.dot-live{
  width:8px;height:8px;border-radius:50%;
  background:var(--accent);
  box-shadow:0 0 0 4px rgba(255,138,61,.16);
  animation:pulse 1.9s ease-in-out infinite;
}
@keyframes pulse{
  0%,100%{opacity:1;transform:scale(1)}
  50%{opacity:.45;transform:scale(.86)}
}
.hero-chip-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:30px}
.chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 14px;border-radius:var(--r-pill);
  background:var(--glass);border:1px solid var(--line);
  font-size:13px;color:var(--text-2);
  font-family:var(--mono);
}
.chip i{color:var(--brand-2);font-size:12px}

/* 概述区 */
.overview-grid{
  display:grid;
  grid-template-columns:1.35fr .9fr;
  gap:34px;
  align-items:start;
}
.prose p{color:var(--text-2);font-size:15.6px;margin-bottom:1.15em}
.prose strong{color:var(--text)}
.side-panel{
  background:var(--glass);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  padding:26px 24px;
  backdrop-filter:blur(16px) saturate(120%);
  -webkit-backdrop-filter:blur(16px) saturate(120%);
  position:relative;
  overflow:hidden;
}
.side-panel::before{
  content:"";position:absolute;right:-40px;top:-40px;width:150px;height:150px;
  background:radial-gradient(circle,rgba(37,224,200,.22),transparent 68%);
}
.side-panel h3{font-size:1.05rem;margin-bottom:16px}
.check-list li{
  display:flex;gap:12px;
  padding:12px 0;
  border-bottom:1px dashed var(--line-soft);
  font-size:14.6px;color:var(--text-2);
}
.check-list li:last-child{border-bottom:0;padding-bottom:0}
.check-list i{color:var(--brand);margin-top:6px;font-size:12px}
.stat-row{
  display:grid;grid-template-columns:repeat(2,1fr);
  gap:14px;margin-top:22px;
}
.stat{
  background:var(--bg-800);
  border:1px solid var(--line-soft);
  border-radius:14px;
  padding:16px;
}
.stat b{
  display:block;font-family:var(--mono);font-size:1.5rem;color:var(--accent);
  line-height:1.2;letter-spacing:-.01em;
}
.stat span{font-size:12.5px;color:var(--text-3);letter-spacing:.02em}

/* 卡片网格（两列错落） */
.card-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:26px;
}
.card-grid > *:nth-child(even){margin-top:38px}
.card{
  background:var(--glass);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  overflow:hidden;
  position:relative;
  transition:transform .26s ease,border-color .26s ease,box-shadow .26s ease;
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
}
.card::after{
  content:"";position:absolute;left:-30px;top:-30px;width:160px;height:160px;
  background:radial-gradient(circle,rgba(31,182,255,.22),transparent 70%);
  opacity:0;transition:opacity .3s ease;pointer-events:none;
}
.card:hover{
  transform:translateY(-4px);
  border-color:rgba(31,182,255,.3);
  box-shadow:0 18px 44px rgba(3,10,20,.55);
}
.card:hover::after{opacity:1}
.card-media{
  position:relative;
  aspect-ratio:16/10;
  overflow:hidden;
  border-radius:0;
  background:var(--bg-700);
}
.card-media img{
  width:100%;height:100%;object-fit:cover;border-radius:0;
  filter:saturate(.85) brightness(.9);
  transition:transform .4s ease,filter .4s ease;
}
.card:hover .card-media img{transform:scale(1.03);filter:saturate(1.02) brightness(1.02)}
.badge{
  position:absolute;left:14px;top:14px;
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;border-radius:var(--r-pill);
  font-size:12px;letter-spacing:.02em;
  background:rgba(31,182,255,.14);
  border:1px solid rgba(31,182,255,.32);
  color:#BFE9FF;
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
}
.card-body{padding:22px}
.card-body h3{font-size:1.1rem;line-height:1.45;margin-bottom:10px}
.card-body p{color:var(--text-2);font-size:14.6px;margin-bottom:14px}
.card-meta{
  display:flex;align-items:center;gap:12px;
  font-size:13px;color:var(--text-3);
  font-family:var(--mono);
  border-top:1px solid var(--line-soft);
  padding-top:14px;
  flex-wrap:wrap;
}
.card-meta .tag{
  padding:3px 10px;border-radius:var(--r-pill);
  background:rgba(31,182,255,.1);
  color:#9DDFFF;font-family:var(--sans);font-size:12px;
}
.card-meta .more{margin-left:auto;color:var(--brand);font-family:var(--sans);font-weight:600}
.card-meta .more:hover{text-shadow:0 0 12px rgba(31,182,255,.7)}

/* 图文长段 */
.split{
  display:grid;
  grid-template-columns:1fr 1.1fr;
  gap:40px;
  align-items:center;
}
.split-media{
  position:relative;
  border-radius:var(--r-card);
  overflow:hidden;
  border:1px solid var(--line);
}
.split-media img{width:100%;border-radius:0;aspect-ratio:16/11;object-fit:cover;filter:saturate(.9)}
.split-media .float-note{
  position:absolute;left:16px;bottom:16px;right:16px;
  padding:14px 16px;
  border-radius:14px;
  background:rgba(10,18,30,.72);
  border:1px solid var(--line);
  backdrop-filter:blur(16px) saturate(120%);
  -webkit-backdrop-filter:blur(16px) saturate(120%);
  font-size:13.4px;color:var(--text-2);
}
.split-media .float-note b{color:#fff;display:block;margin-bottom:4px;font-size:13.6px}
.split h2{margin-bottom:18px}
.split p{color:var(--text-2);font-size:15.6px}
.tick-line{
  display:flex;align-items:center;gap:12px;
  margin:18px 0 0;font-family:var(--mono);font-size:12px;color:var(--text-3);letter-spacing:.1em;
}
.tick-line::before{
  content:"";flex:1;height:1px;
  background:repeating-linear-gradient(90deg,var(--line) 0 8px,transparent 8px 16px);
}

/* 步骤 */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;counter-reset:st}
.step{
  position:relative;
  padding:26px 22px 24px;
  background:var(--bg-800);
  border:1px solid var(--line-soft);
  border-radius:var(--r-card);
  transition:border-color .25s ease,transform .25s ease;
}
.step:hover{border-color:rgba(37,224,200,.35);transform:translateY(-3px)}
.step .num{
  font-family:var(--mono);font-size:12px;letter-spacing:.14em;
  color:var(--accent);display:block;margin-bottom:12px;
}
.step h3{font-size:1.02rem;margin-bottom:8px}
.step p{color:var(--text-2);font-size:14.2px;margin:0}
.step::before{
  content:"";position:absolute;left:22px;right:66%;top:0;height:2px;
  background:linear-gradient(90deg,var(--brand),var(--brand-2));
  border-radius:2px;opacity:.8;
}

/* FAQ */
.faq-acc .accordion-item{
  position:relative;
  background:var(--glass);
  border:1px solid var(--line-soft);
  border-radius:14px;
  margin-bottom:12px;
  overflow:hidden;
}
.faq-acc .accordion-item:has(.accordion-button:not(.collapsed))::before{
  content:"";position:absolute;left:0;top:14px;bottom:14px;width:3px;
  border-radius:3px;background:var(--brand);
  box-shadow:0 0 14px rgba(31,182,255,.9);
  z-index:2;
}
.faq-acc .accordion-button{
  background:transparent;
  color:var(--text);
  font-size:15.6px;font-weight:600;
  min-height:56px;
  padding:16px 52px 16px 22px;
  border:0;box-shadow:none;
  text-align:left;
}
.faq-acc .accordion-button:not(.collapsed){
  background:rgba(31,182,255,.08);
  color:#fff;
  box-shadow:none;
}
.faq-acc .accordion-button:focus{box-shadow:none;outline:none}
.faq-acc .accordion-button:focus-visible{outline:2px solid var(--brand);outline-offset:-2px}
.faq-acc .accordion-button::after{
  background-image:none;
  width:10px;height:10px;
  border-right:2px solid var(--brand);
  border-bottom:2px solid var(--brand);
  transform:rotate(45deg);
  margin-left:auto;
  transition:transform .22s ease;
  position:absolute;right:24px;
}
.faq-acc .accordion-button:not(.collapsed)::after{transform:rotate(-135deg)}
.faq-acc .accordion-body{
  color:var(--text-2);font-size:14.8px;
  padding:0 26px 20px 22px;
  background:transparent;
}

/* 交叉链接 */
.cross-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.cross{
  display:block;
  padding:26px 24px;
  background:var(--bg-800);
  border:1px solid var(--line-soft);
  border-radius:var(--r-card);
  transition:border-color .25s ease,transform .25s ease,background .25s ease;
}
.cross:hover{
  transform:translateY(-4px);
  border-color:rgba(31,182,255,.32);
  background:var(--bg-700);
  color:inherit;
}
.cross i{color:var(--brand-2);font-size:18px;margin-bottom:14px;display:block}
.cross h3{font-size:1.04rem;color:var(--text);margin-bottom:8px}
.cross p{color:var(--text-2);font-size:14.2px;margin:0 0 14px}
.cross span{font-size:13px;color:var(--brand);font-weight:600}

/* CTA 收束 */
.cta-band{
  position:relative;
  border-radius:22px;
  padding:44px 42px;
  background:
    radial-gradient(120% 160% at 8% 0%,rgba(31,182,255,.2),transparent 58%),
    linear-gradient(120deg,rgba(16,28,46,.95),rgba(11,20,33,.95));
  border:1px solid var(--line);
  overflow:hidden;
  display:flex;align-items:center;justify-content:space-between;gap:28px;flex-wrap:wrap;
}
.cta-band::after{
  content:"";position:absolute;right:-60px;bottom:-90px;width:320px;height:320px;
  background:radial-gradient(circle,rgba(255,138,61,.18),transparent 68%);
}
.cta-band h2{font-size:clamp(1.3rem,2.3vw,1.75rem);margin-bottom:8px}
.cta-band p{color:var(--text-2);font-size:15px;margin:0;max-width:620px}
.cta-band > div{position:relative;z-index:2}

/* 页脚 */
.site-footer{
  margin-top:0;
  background:var(--bg-800);
  border-top:1px solid var(--line-soft);
  padding:66px 0 0;
  position:relative;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.4fr 1fr 1fr 1.2fr;
  gap:34px;
  padding-bottom:46px;
}
.footer-col h4{
  font-size:13px;letter-spacing:.1em;color:var(--text-3);
  font-family:var(--mono);font-weight:600;margin-bottom:16px;text-transform:uppercase;
}
.footer-col a{
  display:block;font-size:14.4px;color:var(--text-2);
  padding:7px 0;
}
.footer-col a:hover{color:var(--brand)}
.footer-col p{font-size:14px;color:var(--text-3);line-height:1.85;margin:0}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.footer-brand b{font-family:var(--mono);font-size:16px;color:#fff;letter-spacing:.02em}
.footer-col + .footer-col{border-left:1px solid var(--line-soft);padding-left:34px}
.footer-bottom{
  border-top:1px solid var(--line-soft);
  padding:20px 0 26px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:var(--text-3);
}

/* 移动固定转化条 */
.mobile-bar{
  display:none;
  position:fixed;left:0;right:0;bottom:0;z-index:80;
  align-items:center;justify-content:space-between;gap:14px;
  padding:10px 16px calc(10px + env(safe-area-inset-bottom));
  min-height:56px;
  background:rgba(8,15,26,.86);
  backdrop-filter:blur(16px) saturate(120%);
  -webkit-backdrop-filter:blur(16px) saturate(120%);
  border-top:1px solid rgba(31,182,255,.3);
  box-shadow:0 -8px 30px rgba(0,0,0,.4);
}
.mobile-bar span{font-size:13px;color:var(--text-2)}
.mobile-bar .btn{min-height:44px;padding:0 18px;font-size:14px}

@media (max-width:1200px){
  :root{--sec-gap:88px}
  .overview-grid{grid-template-columns:1.2fr .95fr}
  .steps{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1.3fr 1fr 1fr;gap:28px}
  .footer-col + .footer-col{padding-left:26px}
}
@media (max-width:991px){
  :root{--sec-gap:72px}
  .nav-side{display:none}
  .nav-toggle{display:flex}
  .nav-grid{grid-template-columns:1fr;justify-items:center;min-height:70px}
  .brand{justify-self:center}
  .site-header.scrolled .nav-grid{min-height:64px}
  .mobile-bar{display:flex}
  body{padding-bottom:74px}
  .cat-hero{padding:44px 0 56px}
  .overview-grid,.split{grid-template-columns:1fr;gap:28px}
  .card-grid{grid-template-columns:1fr}
  .card-grid > *:nth-child(even){margin-top:0}
  .cross-grid{grid-template-columns:1fr}
  .cta-band{padding:34px 26px}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-col + .footer-col{border-left:0;padding-left:0}
}
@media (max-width:768px){
  :root{--sec-gap:58px}
  .wrap{padding:0 18px}
  .hero-actions .btn{flex:1 1 auto;justify-content:center}
  .steps{grid-template-columns:1fr}
  .stat-row{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:24px}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
  .cat-hero h1{font-size:1.72rem}
}
@media (max-width:576px){
  body{font-size:15.4px}
  .brand-text small{font-size:10px}
  .card-body{padding:18px}
  .cta-band{padding:28px 20px}
  .mobile-bar span{font-size:12.4px}
}

/* roulang page: category2 */
:root{
  --bg-900:#060B14;
  --bg-800:#0B1421;
  --bg-700:#101C2E;
  --brand:#1FB6FF;
  --brand-2:#25E0C8;
  --accent:#FF8A3D;
  --text:#E8F1FA;
  --text-2:#A8BBD0;
  --text-3:#6E8299;
  --glass:rgba(255,255,255,.055);
  --glass-2:rgba(255,255,255,.09);
  --line:rgba(255,255,255,.12);
  --line-soft:rgba(255,255,255,.06);
  --radius-card:18px;
  --radius-btn:12px;
  --radius-img:14px;
  --radius-input:10px;
  --glow-brand:0 0 0 1px rgba(31,182,255,.35), 0 10px 34px rgba(31,182,255,.28);
  --glow-accent:0 10px 28px rgba(255,138,61,.35);
  --shadow-card:0 18px 44px rgba(2,7,16,.55);
  --font-cn:"PingFang SC","HarmonyOS Sans","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
  --font-num:"SFMono-Regular",Consolas,"Roboto Mono","Menlo",monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  padding-bottom:0;
  background:var(--bg-900);
  color:var(--text);
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  z-index:0;
  background-image:
    linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.035) 1px, transparent 1px);
  background-size:40px 40px;
  opacity:.85;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
a:hover{color:var(--brand)}
button{font-family:inherit}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px}
.wrap{width:100%;max-width:1320px;margin:0 auto;padding:0 24px;position:relative;z-index:1}
.section{padding:104px 0;position:relative}
.section-alt{background:var(--bg-800)}
.section-line{border-top:1px solid var(--line-soft)}
.glow-radial{position:absolute;inset:0;pointer-events:none;background:radial-gradient(600px 300px at 88% 0%, rgba(31,182,255,.16), transparent 70%)}
.eyebrow{
  font-family:var(--font-num);
  font-size:13px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--brand-2);
  margin:0 0 14px;
  display:flex;
  align-items:center;
  gap:10px;
}
.eyebrow::before{content:"";width:26px;height:1px;background:linear-gradient(90deg,var(--brand),transparent)}
h1,h2,h3,h4{color:var(--text);margin:0;font-weight:700}
h1{font-size:clamp(1.9rem,4.2vw,3.1rem);line-height:1.15;letter-spacing:-.02em}
h2{font-size:clamp(1.4rem,2.6vw,2rem);line-height:1.25}
h3{font-size:1.125rem;line-height:1.4;font-weight:600}
p{margin:0 0 16px;color:var(--text-2)}
p:last-child{margin-bottom:0}
.lead{font-size:1.02rem;color:var(--text-2);max-width:70ch}
.muted{color:var(--text-3);font-size:13px;letter-spacing:.02em}

/* ---------- header ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:1000;
  background:rgba(6,11,20,.72);
  backdrop-filter:blur(16px) saturate(120%);
  border-bottom:1px solid var(--line-soft);
  transition:background .25s ease,border-color .25s ease;
}
.site-header.shrink{background:rgba(6,11,20,.92);border-bottom-color:rgba(31,182,255,.28)}
.site-header .wrap{display:flex;align-items:center}
.nav-grid{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  width:100%;
  height:76px;
  transition:height .25s ease;
}
.site-header.shrink .nav-grid{height:64px}
.nav-side{display:flex;align-items:center;gap:6px}
.nav-left{justify-content:flex-end;padding-right:18px}
.nav-right{justify-content:flex-start;padding-left:18px}
.nav-side a{
  position:relative;
  padding:10px 12px;
  font-size:14.5px;
  color:var(--text-2);
  border-radius:8px;
  transition:color .2s ease,background .2s ease;
}
.nav-side a::after{
  content:"";
  position:absolute;
  left:12px;
  right:12px;
  bottom:4px;
  height:2px;
  background:linear-gradient(90deg,var(--brand),var(--brand-2));
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .22s ease;
  border-radius:2px;
}
.nav-side a:hover{color:#fff;background:rgba(255,255,255,.04)}
.nav-side a:hover::after{transform:scaleX(1)}
.nav-side a.active{color:#fff}
.nav-side a.active::after{transform:scaleX(1)}
.nav-cta{
  margin-left:6px;
  padding:10px 18px !important;
  border-radius:999px !important;
  color:#04131F !important;
  font-weight:600;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
  box-shadow:0 8px 22px rgba(31,182,255,.26);
}
.nav-cta::after{display:none}
.nav-cta:hover{filter:brightness(1.08)}
.brand{display:flex;align-items:center;gap:12px;justify-self:center;padding:6px 10px;border-radius:14px}
.brand-mark{filter:drop-shadow(0 6px 16px rgba(31,182,255,.35))}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-text b{font-size:1.06rem;letter-spacing:.01em;color:#fff;font-family:var(--font-num)}
.brand-text small{font-size:11.5px;color:var(--text-3);letter-spacing:.14em}
.nav-toggle{
  display:none;
  width:46px;height:46px;
  border-radius:12px;
  border:1px solid var(--line);
  background:var(--glass);
  color:var(--text);
  font-size:18px;
  align-items:center;justify-content:center;
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:48px;
  padding:12px 24px;
  border-radius:var(--radius-btn);
  font-size:15px;
  font-weight:600;
  border:1px solid transparent;
  cursor:pointer;
  transition:all .22s ease;
}
.btn-primary{
  color:#04131F;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
  box-shadow:var(--glow-brand);
  border-radius:999px;
}
.btn-primary i{transition:transform .22s ease}
.btn-primary:hover{filter:brightness(1.08);box-shadow:0 0 0 1px rgba(31,182,255,.45),0 14px 40px rgba(31,182,255,.36);color:#04131F}
.btn-primary:hover i{transform:translateX(3px)}
.btn-primary:active{transform:translateY(1px)}
.btn-ghost{
  color:var(--text);
  background:var(--glass);
  border:1px solid rgba(31,182,255,.45);
  backdrop-filter:blur(12px);
}
.btn-ghost:hover{background:rgba(31,182,255,.12);color:#fff}
.btn-ghost:active{transform:translateY(1px)}
.btn-sm{min-height:44px;padding:10px 18px;font-size:14px}

/* ---------- tags & chips ---------- */
.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 12px;
  font-size:12.5px;
  letter-spacing:.02em;
  color:var(--brand-2);
  background:rgba(31,182,255,.12);
  border:1px solid rgba(31,182,255,.22);
  border-radius:999px;
}
.chip-accent{color:#FFC79B;background:rgba(255,138,61,.14);border-color:rgba(255,138,61,.28)}

/* ---------- breadcrumb ---------- */
.crumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--text-3);margin-bottom:20px}
.crumb a{color:var(--text-3)}
.crumb a:hover{color:var(--brand)}
.crumb span.sep{opacity:.5}

/* ---------- category hero ---------- */
.cat-hero{
  position:relative;
  padding:56px 0 60px;
  background-image:url("/assets/images/backpic/back-2.png");
  background-size:cover;
  background-position:center 30%;
  overflow:hidden;
}
.cat-hero::before{
  content:"";
  position:absolute;inset:0;
  background:linear-gradient(100deg, rgba(6,11,20,.94) 0%, rgba(6,11,20,.80) 48%, rgba(6,11,20,.66) 100%),
             radial-gradient(520px 260px at 78% 20%, rgba(31,182,255,.24), transparent 72%);
}
.cat-hero .wrap{position:relative;z-index:2}
.cat-hero-inner{max-width:860px}
.cat-hero h1{margin-bottom:16px}
.cat-hero .lead{margin-bottom:26px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;align-items:center}
.hero-note{font-size:12.5px;color:var(--text-3);margin-top:16px;letter-spacing:.02em}
.scale-strip{position:absolute;right:24px;top:24px;display:flex;gap:6px;opacity:.5}
.scale-strip i{display:block;width:2px;height:26px;background:linear-gradient(180deg,var(--brand),transparent)}

/* ---------- metric bar ---------- */
.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line-soft);border:1px solid var(--line-soft);border-radius:var(--radius-card);overflow:hidden;margin-top:40px}
.metric{background:rgba(11,20,33,.72);padding:24px 22px}
.metric b{display:block;font-family:var(--font-num);font-size:1.7rem;color:var(--accent);letter-spacing:.02em;line-height:1.2}
.metric span{display:block;font-size:13.5px;color:var(--text-2);margin-top:6px}
.metrics-note{font-size:12.5px;color:var(--text-3);margin-top:12px}

/* ---------- steps ---------- */
.steps{display:grid;gap:16px;margin-top:36px;position:relative}
.step{
  display:grid;
  grid-template-columns:64px 1fr;
  gap:20px;
  padding:24px;
  background:var(--glass);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  backdrop-filter:blur(16px) saturate(120%);
  transition:transform .25s ease,border-color .25s ease,box-shadow .25s ease;
}
.step:hover{transform:translateY(-4px);border-color:rgba(31,182,255,.32);box-shadow:var(--shadow-card)}
.step-no{
  font-family:var(--font-num);
  font-size:1.5rem;
  color:var(--brand);
  display:flex;
  align-items:center;
  justify-content:center;
  height:64px;
  border-radius:14px;
  background:rgba(31,182,255,.08);
  border:1px solid rgba(31,182,255,.24);
}
.step h3{margin-bottom:8px}
.step p{margin-bottom:0;font-size:15px}

/* ---------- card grid (staggered 2 cols) ---------- */
.stagger-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px;margin-top:38px}
.stagger-grid .card-item:nth-child(even){margin-top:52px}
.card-item{
  background:var(--glass);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  overflow:hidden;
  backdrop-filter:blur(16px) saturate(120%);
  transition:transform .25s ease,border-color .25s ease,box-shadow .25s ease;
  position:relative;
}
.card-item:hover{transform:translateY(-4px);border-color:rgba(31,182,255,.32);box-shadow:var(--shadow-card)}
.card-item::after{
  content:"";
  position:absolute;
  left:-40%;top:-60%;
  width:60%;height:120%;
  background:radial-gradient(circle, rgba(31,182,255,.22), transparent 70%);
  opacity:0;
  transition:opacity .3s ease;
  pointer-events:none;
}
.card-item:hover::after{opacity:1}
.card-media{aspect-ratio:16/10;overflow:hidden;background:var(--bg-700)}
.card-media img{width:100%;height:100%;object-fit:cover;filter:saturate(.88);transition:transform .45s ease,filter .35s ease}
.card-item:hover .card-media img{transform:scale(1.03);filter:saturate(1.05)}
.card-body{padding:24px}
.card-body h3{margin-bottom:10px}
.card-body p{font-size:14.6px;margin-bottom:14px}
.card-meta{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:13px;color:var(--text-3)}
.card-link{display:inline-flex;align-items:center;gap:8px;font-size:14px;font-weight:600;color:var(--brand);margin-top:6px}
.card-link:hover{color:var(--brand-2)}
.card-link i{transition:transform .2s ease}
.card-link:hover i{transform:translateX(3px)}

/* ---------- panel ---------- */
.panel{
  background:var(--glass);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  backdrop-filter:blur(16px) saturate(120%);
  padding:28px;
}
.status-row{display:flex;align-items:center;gap:12px;padding:14px 0;border-bottom:1px dashed rgba(255,255,255,.10)}
.status-row:last-child{border-bottom:0}
.dot{width:9px;height:9px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 0 rgba(255,138,61,.5);animation:pulse 2.4s infinite}
@keyframes pulse{
  0%{box-shadow:0 0 0 0 rgba(255,138,61,.5)}
  70%{box-shadow:0 0 0 10px rgba(255,138,61,0)}
  100%{box-shadow:0 0 0 0 rgba(255,138,61,0)}
}
.status-row b{font-family:var(--font-num);color:var(--text);font-size:14.5px;min-width:auto}
.status-row span{color:var(--text-2);font-size:14px;margin-left:auto;text-align:right}

/* ---------- scene / cross links ---------- */
.cross-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:36px}
.cross-card{
  display:block;
  padding:24px;
  border-radius:var(--radius-card);
  background:var(--glass);
  border:1px solid var(--line);
  transition:transform .25s ease,border-color .25s ease,background .25s ease;
}
.cross-card:hover{transform:translateY(-4px);border-color:rgba(31,182,255,.34);background:var(--glass-2);color:var(--text)}
.cross-card i{color:var(--brand-2);font-size:18px}
.cross-card h3{margin:14px 0 8px}
.cross-card p{font-size:14px;margin-bottom:0}

/* ---------- accordion ---------- */
.faq-accordion{margin-top:34px;--bs-accordion-bg:transparent;--bs-accordion-border-color:transparent;--bs-accordion-color:var(--text);--bs-accordion-btn-color:var(--text);--bs-accordion-active-color:#fff;--bs-accordion-active-bg:transparent;--bs-accordion-body-padding-x:22px;--bs-accordion-body-padding-y:18px}
.faq-accordion .accordion-item{
  background:var(--glass);
  border:1px solid var(--line) !important;
  border-radius:14px !important;
  margin-bottom:14px;
  overflow:hidden;
  backdrop-filter:blur(14px);
  transition:border-color .22s ease;
}
.faq-accordion .accordion-item:has(.accordion-button:not(.collapsed)){border-color:rgba(31,182,255,.34) !important}
.faq-accordion .accordion-button{
  position:relative;
  background:transparent;
  box-shadow:none !important;
  font-size:15.5px;
  font-weight:600;
  padding:18px 22px 18px 24px;
  min-height:56px;
  color:var(--text);
}
.faq-accordion .accordion-button::after{
  background-image:none;
  content:"\f078";
  font-family:"Font Awesome 6 Free";
  font-weight:900;
  font-size:13px;
  color:var(--brand);
  width:auto;height:auto;
  display:flex;align-items:center;justify-content:center;
  transition:transform .22s ease;
}
.faq-accordion .accordion-button:not(.collapsed)::after{transform:rotate(180deg)}
.faq-accordion .accordion-button::before{
  content:"";
  position:absolute;
  left:0;top:12px;bottom:12px;
  width:3px;
  border-radius:3px;
  background:linear-gradient(180deg,var(--brand),var(--brand-2));
  opacity:0;
  transition:opacity .22s ease;
  box-shadow:0 0 14px rgba(31,182,255,.6);
}
.faq-accordion .accordion-button:not(.collapsed)::before{opacity:1}
.faq-accordion .accordion-body{color:var(--text-2);font-size:14.8px;border-top:1px solid var(--line-soft)}

/* ---------- cta ---------- */
.cta-band{
  position:relative;
  overflow:hidden;
  background:var(--glass);
  border:1px solid var(--line);
  border-radius:22px;
  padding:42px;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  backdrop-filter:blur(18px) saturate(120%);
}
.cta-band::after{
  content:"";
  position:absolute;
  right:-10%;top:-70%;
  width:44%;height:220%;
  background:radial-gradient(circle, rgba(31,182,255,.22), transparent 68%);
  pointer-events:none;
}
.cta-band h2{margin-bottom:8px;font-size:clamp(1.3rem,2.2vw,1.7rem)}
.cta-band p{margin-bottom:0;font-size:14.6px}

/* ---------- footer ---------- */
.site-footer{background:var(--bg-800);border-top:1px solid var(--line-soft);padding:64px 0 28px;position:relative;z-index:1}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:0}
.footer-col{padding:0 26px;border-left:1px solid var(--line-soft)}
.footer-col:first-child{border-left:0;padding-left:0}
.footer-col h4{font-size:14px;letter-spacing:.06em;color:var(--text);margin-bottom:16px}
.footer-col p{font-size:13.6px;color:var(--text-3);line-height:1.85}
.footer-col a{display:block;font-size:14px;color:var(--text-2);padding:7px 0;transition:color .2s ease,transform .2s ease}
.footer-col a:hover{color:var(--brand);transform:translateX(3px)}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.footer-brand b{font-family:var(--font-num);font-size:1.05rem;color:#fff}
.footer-bottom{
  margin-top:44px;
  padding-top:20px;
  border-top:1px solid var(--line-soft);
  display:flex;flex-wrap:wrap;gap:10px;
  justify-content:space-between;
  font-size:12.6px;
  color:var(--text-3);
}

/* ---------- mobile bar ---------- */
.mobile-bar{display:none}

/* ---------- responsive ---------- */
@media (max-width:1200px){
  .section{padding:88px 0}
  .footer-grid{grid-template-columns:1fr 1fr;gap:0}
  .footer-col{padding:0 22px}
  .footer-col:nth-child(3){border-left:0;padding-left:0;margin-top:28px}
  .footer-col:nth-child(4){margin-top:28px}
}
@media (max-width:991px){
  body{padding-bottom:72px}
  .site-header .wrap{justify-content:flex-end;height:64px}
  .nav-grid{
    position:fixed;
    inset:0;
    display:none;
    flex-direction:column;
    align-items:flex-start;
    gap:6px;
    padding:92px 24px 120px;
    background:rgba(6,11,20,.97);
    backdrop-filter:blur(20px);
    z-index:1000;
    overflow-y:auto;
  }
  .nav-grid.open{display:flex}
  .nav-side{flex-direction:column;align-items:flex-start;width:100%;padding:0}
  .nav-side a{width:100%;padding:15px 4px;font-size:16px;border-bottom:1px solid var(--line-soft);border-radius:0}
  .nav-side a::after{left:4px;right:auto;width:48px;bottom:8px}
  .nav-cta{margin:20px 0 0;width:100%;justify-content:center;padding:14px 20px !important;border-radius:999px !important;font-size:15px}
  .nav-toggle{display:inline-flex;position:relative;z-index:1002}
  .brand{position:fixed;top:10px;left:50%;transform:translateX(-50%);z-index:1001}
  .brand-text small{font-size:10.5px}
  .cat-hero{padding:44px 0 48px}
  .metrics{grid-template-columns:1fr 1fr}
  .stagger-grid{grid-template-columns:1fr}
  .stagger-grid .card-item:nth-child(even){margin-top:0}
  .cross-grid{grid-template-columns:1fr}
  .cta-band{padding:30px}
  .mobile-bar{
    display:flex;
    position:fixed;
    left:0;right:0;bottom:0;
    z-index:990;
    align-items:center;
    justify-content:space-between;
    gap:14px;
    padding:10px 16px calc(10px + env(safe-area-inset-bottom));
    min-height:56px;
    background:rgba(8,15,26,.92);
    backdrop-filter:blur(16px);
    border-top:1px solid rgba(31,182,255,.3);
    box-shadow:0 -10px 30px rgba(0,0,0,.4);
  }
  .mobile-bar span{font-size:13.5px;color:var(--text-2)}
}
@media (max-width:768px){
  .wrap{padding:0 16px}
  .section{padding:72px 0}
  .step{grid-template-columns:1fr;gap:14px;padding:20px}
  .step-no{width:54px;height:54px;justify-content:flex-start;font-size:1.25rem;border-radius:12px;padding-left:0;width:100%;height:auto;background:transparent;border:0;justify-content:flex-start}
  .footer-grid{grid-template-columns:1fr}
  .footer-col{padding:0;border-left:0;margin-top:26px}
  .footer-col:first-child{margin-top:0}
  .metrics{grid-template-columns:1fr}
  .hero-actions .btn{width:100%;justify-content:center}
  .cta-band{flex-direction:column;align-items:flex-start}
}
@media (max-width:520px){
  h1{font-size:1.65rem}
  .card-body{padding:20px}
  .panel{padding:20px}
  .cta-band{padding:24px}
}

/* roulang page: category3 */
:root{
  --bg-900:#060B14;
  --bg-800:#0B1421;
  --bg-700:#101C2E;
  --brand:#1FB6FF;
  --brand-2:#25E0C8;
  --accent:#FF8A3D;
  --text:#E8F1FA;
  --text-2:#A8BBD0;
  --text-3:#6E8299;
  --glass:rgba(255,255,255,.055);
  --glass-strong:rgba(255,255,255,.08);
  --line:rgba(255,255,255,.12);
  --line-soft:rgba(255,255,255,.06);
  --glow-brand:0 0 0 1px rgba(31,182,255,.35), 0 10px 34px rgba(31,182,255,.28);
  --glow-accent:0 10px 28px rgba(255,138,61,.35);
  --r-card:18px;
  --r-btn:12px;
  --r-img:14px;
  --r-input:10px;
  --shadow-card:0 18px 46px rgba(0,0,0,.42);
  --font-cn:"PingFang SC","HarmonyOS Sans","Microsoft YaHei","Noto Sans SC","Helvetica Neue",Arial,sans-serif;
  --font-mono:"SFMono-Regular",Consolas,"Roboto Mono","Courier New",monospace;
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.85;
  color:var(--text);
  background:
    radial-gradient(1100px 620px at 82% -12%, rgba(31,182,255,.12), transparent 62%),
    radial-gradient(900px 520px at -6% 16%, rgba(37,224,200,.08), transparent 66%),
    var(--bg-900);
  background-attachment:fixed;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  z-index:0;
  background-image:
    linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.035) 1px, transparent 1px);
  background-size:40px 40px;
  mask-image:radial-gradient(circle at 50% 20%, #000 0%, transparent 78%);
  -webkit-mask-image:radial-gradient(circle at 50% 20%, #000 0%, transparent 78%);
}
img{max-width:100%;display:block;}
a{color:var(--text-2);text-decoration:none;transition:color .22s ease, border-color .22s ease, background-color .22s ease;}
a:hover{color:var(--brand);}
button{font-family:inherit;}
h1,h2,h3,h4{margin:0;color:var(--text);font-weight:700;letter-spacing:-0.01em;}
p{margin:0 0 1em;}
p:last-child{margin-bottom:0;}
ul{margin:0;padding:0;list-style:none;}
::selection{background:rgba(31,182,255,.35);color:#fff;}

.wrap{
  width:100%;
  max-width:1320px;
  margin:0 auto;
  padding:0 24px;
  position:relative;
  z-index:2;
}
.section{padding:100px 0;position:relative;}
.section-alt{background:var(--bg-800);border-top:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft);}
.section-head{max-width:760px;margin-bottom:48px;}
.section-label{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--brand);font-family:var(--font-mono);
  margin-bottom:14px;
}
.section-label::before{content:"";width:22px;height:1px;background:var(--brand);display:block;opacity:.7;}
.section-title{font-size:clamp(1.4rem,2.6vw,2rem);line-height:1.25;}
.section-desc{color:var(--text-2);margin-top:14px;font-size:15.5px;}

/* ---------- 按钮 ---------- */
.btn-main,.btn-ghost{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  min-height:48px;padding:0 26px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;border:1px solid transparent;
  cursor:pointer;position:relative;
  transition:all .24s ease;
}
.btn-main{
  background:linear-gradient(120deg,var(--brand),var(--brand-2));
  color:#04121d;border-radius:999px;box-shadow:var(--glow-brand);
}
.btn-main i{transition:transform .24s ease;}
.btn-main:hover{filter:brightness(1.08);box-shadow:0 0 0 1px rgba(31,182,255,.5),0 14px 40px rgba(31,182,255,.4);color:#04121d;transform:translateY(-1px);}
.btn-main:hover i{transform:translateX(3px);}
.btn-main:active{transform:translateY(1px);}
.btn-ghost{
  background:var(--glass);border-color:rgba(31,182,255,.45);color:var(--text);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
}
.btn-ghost:hover{background:rgba(31,182,255,.12);border-color:var(--brand);color:#fff;}
.btn-ghost:active{transform:translateY(1px);}
a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{
  outline:2px solid var(--brand);outline-offset:2px;border-radius:6px;
}

/* ---------- 头部导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(6,11,20,.72);
  backdrop-filter:blur(16px) saturate(120%);
  -webkit-backdrop-filter:blur(16px) saturate(120%);
  border-bottom:1px solid var(--line-soft);
  transition:background .3s ease, box-shadow .3s ease, padding .3s ease;
}
.site-header.scrolled{
  background:rgba(6,11,20,.9);
  box-shadow:0 1px 0 rgba(31,182,255,.22), 0 16px 40px rgba(0,0,0,.45);
}
.site-header .wrap{padding-top:16px;padding-bottom:16px;transition:padding .3s ease;}
.site-header.scrolled .wrap{padding-top:10px;padding-bottom:10px;}
.nav-grid{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:28px;
}
.nav-side{display:flex;align-items:center;gap:26px;}
.nav-left{justify-content:flex-end;}
.nav-right{justify-content:flex-start;}
.nav-side a{
  position:relative;
  font-size:14.5px;
  color:var(--text-2);
  padding:8px 2px;
  white-space:nowrap;
}
.nav-side a::after{
  content:"";position:absolute;left:0;right:0;bottom:2px;height:2px;
  background:linear-gradient(90deg,var(--brand),var(--brand-2));
  transform:scaleX(0);transform-origin:left;transition:transform .26s ease;
  border-radius:2px;
}
.nav-side a:hover{color:#fff;}
.nav-side a:hover::after{transform:scaleX(1);}
.nav-side a.active{color:#fff;}
.nav-side a.active::after{transform:scaleX(1);}
.nav-cta{
  display:inline-flex;align-items:center;gap:7px;
  padding:10px 20px !important;
  border-radius:999px;
  background:linear-gradient(120deg,var(--brand),var(--brand-2));
  color:#04121d !important;font-weight:700;font-size:14px;
  box-shadow:var(--glow-accent);
}
.nav-cta::after{display:none;}
.nav-cta:hover{filter:brightness(1.08);box-shadow:0 0 0 1px rgba(255,138,61,.45),0 14px 32px rgba(255,138,61,.4);}
.brand{
  display:inline-flex;align-items:center;gap:11px;
  justify-self:center;
}
.brand-mark{flex:0 0 auto;filter:drop-shadow(0 0 10px rgba(31,182,255,.5));}
.brand-text{display:flex;flex-direction:column;line-height:1.1;}
.brand-text b{
  font-family:var(--font-mono);
  font-size:19px;letter-spacing:.02em;color:#fff;
}
.brand-text small{font-size:11.5px;color:var(--text-3);letter-spacing:.06em;}
.brand:hover .brand-text b{color:var(--brand-2);}
.nav-toggle{
  display:none;
  width:46px;height:46px;border-radius:12px;
  background:var(--glass);border:1px solid var(--line);color:var(--text);
  font-size:17px;align-items:center;justify-content:center;cursor:pointer;
}
.nav-toggle:hover{border-color:var(--brand);color:var(--brand);}

/* ---------- Hero ---------- */
.cat-hero{
  position:relative;
  padding:70px 0 62px;
  background-image:url("/assets/images/backpic/back-2.png");
  background-size:cover;
  background-position:center 30%;
  overflow:hidden;
  border-bottom:1px solid var(--line-soft);
}
.cat-hero::before{
  content:"";position:absolute;inset:0;
  background:
    linear-gradient(100deg, rgba(6,11,20,.94) 8%, rgba(6,11,20,.78) 48%, rgba(6,11,20,.88) 100%),
    radial-gradient(680px 340px at 88% 12%, rgba(31,182,255,.24), transparent 70%);
}
.cat-hero::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(31,182,255,.5),transparent);
}
.cat-hero .wrap{position:relative;z-index:2;}
.crumb{
  display:flex;align-items:center;gap:10px;
  font-size:13px;color:var(--text-3);margin-bottom:22px;
}
.crumb a{color:var(--text-3);}
.crumb a:hover{color:var(--brand);}
.crumb span.sep{color:rgba(255,255,255,.22);}
.crumb .now{color:var(--brand);}
.cat-hero h1{
  font-size:clamp(1.9rem,4.2vw,3.1rem);
  line-height:1.15;
  letter-spacing:-0.02em;
  max-width:900px;
}
.cat-hero .lede{
  margin-top:18px;max-width:660px;
  color:var(--text-2);font-size:16.5px;line-height:1.9;
}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px;}
.tag-pill{
  display:inline-flex;align-items:center;gap:7px;
  padding:7px 15px;border-radius:999px;
  background:rgba(31,182,255,.12);
  border:1px solid rgba(31,182,255,.28);
  color:var(--brand-2);font-size:13px;
}
.tag-pill i{font-size:11px;}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px;}

/* ---------- 概述 ---------- */
.overview-grid{
  display:grid;grid-template-columns:1.15fr .85fr;gap:52px;align-items:start;
}
.overview-copy p{color:var(--text-2);font-size:16px;line-height:1.95;}
.overview-copy p strong{color:var(--text);font-weight:600;}
.check-panel{
  background:var(--glass);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  padding:28px;
  backdrop-filter:blur(16px) saturate(120%);
  -webkit-backdrop-filter:blur(16px) saturate(120%);
  box-shadow:var(--shadow-card);
  position:relative;
  overflow:hidden;
}
.check-panel::before{
  content:"";position:absolute;top:-40px;left:-40px;width:150px;height:150px;
  background:radial-gradient(circle,rgba(31,182,255,.28),transparent 70%);
  pointer-events:none;
}
.check-panel h3{font-size:1.05rem;margin-bottom:18px;display:flex;align-items:center;gap:9px;}
.check-panel h3 i{color:var(--brand);}
.check-list li{
  display:flex;gap:12px;align-items:flex-start;
  padding:12px 0;border-bottom:1px dashed rgba(255,255,255,.09);
  font-size:14.6px;color:var(--text-2);line-height:1.7;
}
.check-list li:last-child{border-bottom:0;padding-bottom:0;}
.check-list li i{
  color:var(--accent);font-size:13px;margin-top:6px;flex:0 0 auto;
}

/* ---------- 卡片网格（2 列错落） ---------- */
.card-grid-2{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:26px;
}
.card-grid-2 .stagger{transform:translateY(30px);}
.info-card{
  position:relative;
  background:var(--glass);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  padding:28px 26px;
  backdrop-filter:blur(16px) saturate(120%);
  -webkit-backdrop-filter:blur(16px) saturate(120%);
  transition:transform .28s ease, border-color .28s ease, box-shadow .28s ease;
  overflow:hidden;
}
.info-card::after{
  content:"";position:absolute;top:0;left:0;width:150px;height:150px;
  background:radial-gradient(circle at 0 0, rgba(31,182,255,.22), transparent 70%);
  opacity:0;transition:opacity .3s ease;pointer-events:none;
}
.info-card:hover{transform:translateY(-4px);border-color:rgba(31,182,255,.32);box-shadow:var(--shadow-card);}
.info-card:hover::after{opacity:1;}
.info-card .ic{
  width:46px;height:46px;border-radius:12px;
  display:inline-flex;align-items:center;justify-content:center;
  background:rgba(31,182,255,.12);
  border:1px solid rgba(31,182,255,.28);
  color:var(--brand-2);font-size:18px;margin-bottom:18px;
}
.info-card h3{font-size:1.125rem;margin-bottom:10px;}
.info-card p{color:var(--text-2);font-size:14.8px;line-height:1.8;}
.info-card .card-meta{
  display:flex;align-items:center;gap:8px;
  margin-top:18px;font-size:12.5px;font-family:var(--font-mono);
  color:var(--text-3);letter-spacing:.04em;
}
.info-card .card-meta i{color:var(--accent);}

/* ---------- 步骤流程 ---------- */
.flow{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:0;margin-top:8px;}
.flow-step{
  position:relative;
  padding:26px 20px 24px;
  border-top:1px solid rgba(255,255,255,.1);
}
.flow-step::before{
  content:"";position:absolute;top:-4px;left:0;width:8px;height:8px;border-radius:50%;
  background:var(--brand);box-shadow:0 0 12px rgba(31,182,255,.8);
}
.flow-step:nth-child(4)::before,.flow-step:nth-child(5)::before{background:var(--accent);box-shadow:0 0 12px rgba(255,138,61,.7);}
.flow-num{
  font-family:var(--font-mono);font-size:13px;letter-spacing:.14em;
  color:var(--accent);margin-bottom:10px;display:block;
}
.flow-step h3{font-size:1rem;margin-bottom:9px;}
.flow-step p{font-size:14px;color:var(--text-2);line-height:1.75;}

/* ---------- 图文长段 ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:54px;align-items:center;}
.figure-box{position:relative;border-radius:var(--r-card);overflow:hidden;border:1px solid var(--line);}
.figure-box img{
  width:100%;aspect-ratio:16/10;object-fit:cover;
  border-radius:var(--r-img);
  filter:saturate(.82) brightness(.92);
  transition:filter .35s ease, transform .5s ease;
}
.figure-box:hover img{filter:saturate(1) brightness(1.03);transform:scale(1.03);}
.figure-note{
  position:absolute;left:16px;right:16px;bottom:16px;
  background:rgba(11,20,33,.78);
  border:1px solid var(--line);
  border-radius:12px;
  padding:12px 15px;
  font-size:13px;color:var(--text-2);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
}
.figure-note b{color:var(--brand-2);font-weight:600;}
.split h2{font-size:clamp(1.4rem,2.6vw,2rem);line-height:1.25;margin-bottom:18px;}
.split p{color:var(--text-2);font-size:15.6px;line-height:1.95;}
.split-list{margin-top:22px;display:grid;gap:12px;}
.split-list li{
  display:flex;gap:12px;align-items:flex-start;
  font-size:14.6px;color:var(--text-2);
}
.split-list li i{color:var(--brand);margin-top:5px;font-size:13px;}

/* ---------- FAQ ---------- */
.faq-wrap{max-width:920px;margin:0 auto;}
.accordion-item{
  background:transparent;
  border:1px solid var(--line) !important;
  border-radius:var(--r-card) !important;
  margin-bottom:14px;
  overflow:hidden;
  transition:border-color .25s ease, background-color .25s ease;
}
.accordion-item:hover{border-color:rgba(31,182,255,.3) !important;}
.accordion-button{
  background:var(--glass) !important;
  color:var(--text) !important;
  font-size:15.8px;
  font-weight:600;
  padding:20px 22px;
  min-height:56px;
  box-shadow:none !important;
  border-radius:0 !important;
  transition:background-color .22s ease, border-color .22s ease;
}
.accordion-button:not(.collapsed){
  background:rgba(31,182,255,.08) !important;
  color:#fff !important;
  border-left:3px solid var(--brand);
  box-shadow:0 0 24px rgba(31,182,255,.16) inset !important;
}
.accordion-button::after{
  content:"\f078";
  font-family:"Font Awesome 6 Free";
  font-weight:900;
  font-size:13px;
  color:var(--brand);
  background-image:none !important;
  width:auto;height:auto;
  transform:none;
  transition:transform .22s ease;
  margin-left:16px;
}
.accordion-button:not(.collapsed)::after{transform:rotate(180deg);}
.accordion-button:focus{box-shadow:none !important;outline:none !important;}
.accordion-button:focus-visible{outline:2px solid var(--brand) !important;outline-offset:-2px;}
.accordion-body{
  background:rgba(255,255,255,.03);
  color:var(--text-2);
  font-size:15px;
  line-height:1.9;
  padding:20px 24px 24px;
  border-top:1px solid var(--line-soft);
}

/* ---------- 交叉链接 ---------- */
.cross-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;}
.cross-card{
  display:block;
  background:var(--glass);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  padding:26px 24px;
  transition:transform .26s ease, border-color .26s ease, box-shadow .26s ease;
}
.cross-card:hover{transform:translateY(-4px);border-color:rgba(31,182,255,.34);box-shadow:var(--shadow-card);}
.cross-card .cc-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px;}
.cross-card .cc-top i{font-size:19px;color:var(--brand-2);}
.cross-card .cc-idx{
  font-family:var(--font-mono);font-size:12px;color:var(--text-3);letter-spacing:.12em;
}
.cross-card h3{font-size:1.05rem;margin-bottom:10px;}
.cross-card p{font-size:14.2px;color:var(--text-2);line-height:1.75;}
.cross-card .cc-link{
  display:inline-flex;align-items:center;gap:7px;
  margin-top:18px;font-size:13.5px;color:var(--brand);
}
.cross-card .cc-link i{font-size:11px;transition:transform .24s ease;}
.cross-card:hover .cc-link i{transform:translateX(3px);}

/* ---------- 底部 CTA ---------- */
.cta-band{
  background:linear-gradient(120deg, rgba(31,182,255,.12), rgba(37,224,200,.06));
  border:1px solid rgba(31,182,255,.26);
  border-radius:22px;
  padding:44px 40px;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:26px;
  backdrop-filter:blur(16px) saturate(120%);
  -webkit-backdrop-filter:blur(16px) saturate(120%);
  position:relative;
  overflow:hidden;
}
.cta-band::after{
  content:"";position:absolute;right:-60px;top:-60px;width:260px;height:260px;
  background:radial-gradient(circle,rgba(255,138,61,.2),transparent 68%);
  pointer-events:none;
}
.cta-band h2{font-size:clamp(1.25rem,2.2vw,1.7rem);line-height:1.3;margin-bottom:8px;}
.cta-band p{color:var(--text-2);font-size:14.8px;}

/* ---------- 页脚 ---------- */
.site-footer{
  background:var(--bg-800);
  border-top:1px solid var(--line-soft);
  padding:64px 0 26px;
  position:relative;
  margin-top:0;
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(31,182,255,.45),transparent);
}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.4fr;gap:34px;}
.footer-col h4{
  font-size:14px;color:#fff;margin-bottom:18px;letter-spacing:.04em;
}
.footer-col a{
  display:block;font-size:14px;color:var(--text-2);
  padding:6px 0;position:relative;
}
.footer-col a:hover{color:var(--brand);}
.footer-col p{font-size:13.6px;color:var(--text-3);line-height:1.85;}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px;}
.footer-brand b{font-family:var(--font-mono);font-size:18px;color:#fff;letter-spacing:.02em;}
.footer-col + .footer-col{border-left:1px solid var(--line-soft);padding-left:34px;}
.footer-bottom{
  margin-top:44px;padding-top:22px;border-top:1px solid var(--line-soft);
  display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;
  font-size:13px;color:var(--text-3);
}

/* ---------- 移动端底部转化条 ---------- */
.mobile-bar{
  display:none;
  position:fixed;left:0;right:0;bottom:0;z-index:70;
  align-items:center;justify-content:space-between;gap:14px;
  padding:8px 16px calc(8px + env(safe-area-inset-bottom));
  min-height:56px;
  background:rgba(8,14,24,.9);
  backdrop-filter:blur(16px) saturate(120%);
  -webkit-backdrop-filter:blur(16px) saturate(120%);
  border-top:1px solid rgba(31,182,255,.28);
  box-shadow:0 -8px 30px rgba(0,0,0,.5);
}
.mobile-bar span{font-size:13px;color:var(--text-2);}
.mobile-bar .btn-main{min-height:44px;padding:0 20px;font-size:14px;}

/* ---------- 响应式 ---------- */
@media (max-width:1199px){
  .nav-side{gap:18px;}
  .nav-side a{font-size:14px;}
  .overview-grid{gap:36px;}
  .split{gap:38px;}
}
@media (max-width:991px){
  .wrap{padding:0 16px;}
  .section{padding:72px 0;}
  .nav-toggle{display:inline-flex;}
  .site-header .wrap{padding-top:12px;padding-bottom:12px;}
  .nav-grid{
    position:fixed;inset:0 0 0 0;
    display:none;flex-direction:column;align-items:stretch;justify-content:flex-start;
    gap:0;
    background:rgba(6,11,20,.97);
    backdrop-filter:blur(18px);
    -webkit-backdrop-filter:blur(18px);
    padding:86px 24px calc(96px + env(safe-area-inset-bottom));
    overflow-y:auto;
  }
  .site-header.open .nav-grid{display:flex;}
  .site-header.open .nav-toggle{position:fixed;top:14px;right:16px;z-index:80;}
  .nav-side{flex-direction:column;align-items:stretch;justify-content:flex-start;gap:0;}
  .nav-left,.nav-right{border-top:1px solid var(--line-soft);padding-top:10px;margin-top:10px;}
  .nav-side a{
    font-size:16px;padding:15px 4px;
    border-bottom:1px solid var(--line-soft);
    min-height:48px;display:flex;align-items:center;
  }
  .nav-side a::after{display:none;}
  .nav-cta{justify-content:center;margin-top:20px;border-radius:999px;min-height:48px;}
  .brand{
    position:fixed;top:12px;left:16px;z-index:80;
  }
  .brand-text small{display:none;}
  .cat-hero{padding:44px 0 46px;}
  .overview-grid{grid-template-columns:1fr;}
  .card-grid-2{grid-template-columns:1fr;}
  .card-grid-2 .stagger{transform:none;}
  .flow{grid-template-columns:repeat(2,minmax(0,1fr));}
  .split{grid-template-columns:1fr;}
  .cross-grid{grid-template-columns:1fr;}
  .cta-band{padding:32px 24px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px;}
  .footer-col + .footer-col{border-left:0;padding-left:0;}
  .mobile-bar{display:flex;}
  body{padding-bottom:76px;}
}
@media (max-width:575px){
  .section{padding:56px 0;}
  .cat-hero h1{font-size:1.72rem;}
  .cat-hero .lede{font-size:15.4px;}
  .flow{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr;}
  .footer-bottom{flex-direction:column;gap:8px;}
  .hero-actions{flex-direction:column;}
  .hero-actions .btn-main,.hero-actions .btn-ghost{width:100%;}
  .cta-band{flex-direction:column;align-items:flex-start;}
  .cta-band .btn-main{width:100%;}
}

/* roulang page: category4 */
:root{
  --bg-900:#060B14;
  --bg-800:#0B1421;
  --bg-700:#101C2E;
  --brand:#1FB6FF;
  --brand-2:#25E0C8;
  --accent:#FF8A3D;
  --text:#E8F1FA;
  --text-2:#A8BBD0;
  --text-3:#6E8299;
  --glass:rgba(255,255,255,.055);
  --line:rgba(255,255,255,.12);
  --line-soft:rgba(255,255,255,.06);
  --glow-brand:0 0 0 1px rgba(31,182,255,.35), 0 10px 34px rgba(31,182,255,.28);
  --glow-accent:0 10px 28px rgba(255,138,61,.35);
  --r-card:18px;
  --r-btn:12px;
  --r-img:14px;
  --r-input:10px;
  --font-cn:"PingFang SC","HarmonyOS Sans","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg-900);
  color:var(--text);
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  z-index:0;
  background-image:
    linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.035) 1px, transparent 1px);
  background-size:40px 40px;
  opacity:.55;
}
body::after{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  z-index:0;
  background:
    radial-gradient(900px 520px at 12% -6%, rgba(31,182,255,.14), transparent 65%),
    radial-gradient(760px 480px at 92% 8%, rgba(37,224,200,.10), transparent 62%);
}
a{color:inherit;text-decoration:none;transition:color .2s ease}
a:hover{color:var(--brand)}
img{max-width:100%;display:block}
h1,h2,h3,h4{margin:0;font-weight:700;letter-spacing:-.01em}
p{margin:0 0 1em}
ul{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px}
.wrap{
  width:100%;
  max-width:1320px;
  margin:0 auto;
  padding:0 24px;
  position:relative;
  z-index:2;
}
.eyebrow{
  display:inline-block;
  font-size:13px;
  letter-spacing:.14em;
  color:var(--brand-2);
  text-transform:uppercase;
  margin-bottom:14px;
}
.section{padding:104px 0;position:relative;border-top:1px solid var(--line-soft)}
.section h2{font-size:clamp(1.4rem,2.6vw,2rem);line-height:1.25;margin-bottom:16px}
.section-lead{color:var(--text-2);max-width:640px;margin-bottom:44px}
.mono{font-family:var(--font-mono);letter-spacing:.02em}

/* ============ header ============ */
.site-header{
  position:sticky;
  top:0;
  z-index:1050;
  background:rgba(6,11,20,.72);
  backdrop-filter:blur(16px) saturate(120%);
  -webkit-backdrop-filter:blur(16px) saturate(120%);
  border-bottom:1px solid var(--line-soft);
  transition:background .25s ease, border-color .25s ease;
}
.site-header.scrolled{background:rgba(6,11,20,.92);border-bottom-color:rgba(31,182,255,.28)}
.site-header .wrap{padding:0 24px}
.nav-grid{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:20px;
  min-height:76px;
  transition:min-height .25s ease;
}
.site-header.scrolled .nav-grid{min-height:64px}
.nav-side{display:flex;align-items:center;gap:26px}
.nav-left{justify-content:flex-end}
.nav-right{justify-content:flex-start}
.nav-side a{
  position:relative;
  font-size:15px;
  color:var(--text-2);
  padding:8px 2px;
  white-space:nowrap;
}
.nav-side a::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:2px;
  height:2px;
  background:linear-gradient(90deg,var(--brand),var(--brand-2));
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .22s ease;
  border-radius:2px;
}
.nav-side a:hover{color:var(--text)}
.nav-side a:hover::after{transform:scaleX(1)}
.nav-side a.active{color:var(--brand)}
.nav-side a.active::after{transform:scaleX(1)}
.nav-cta{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 20px !important;
  border-radius:999px;
  background:linear-gradient(120deg,var(--brand),var(--brand-2));
  color:#04121E !important;
  font-weight:700;
  box-shadow:var(--glow-brand);
}
.nav-cta::after{display:none}
.nav-cta:hover{filter:brightness(1.08);box-shadow:0 0 0 1px rgba(31,182,255,.45),0 12px 34px rgba(31,182,255,.36);color:#04121E !important}
.brand{display:flex;align-items:center;gap:12px;justify-self:center}
.brand-mark{flex:0 0 auto;filter:drop-shadow(0 6px 18px rgba(31,182,255,.35))}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-text b{font-family:var(--font-mono);font-size:1.16rem;letter-spacing:.06em;color:var(--text)}
.brand-text small{font-size:11px;letter-spacing:.22em;color:var(--text-3)}
.nav-toggle{
  display:none;
  margin-left:auto;
  width:44px;height:44px;
  border-radius:12px;
  border:1px solid var(--line);
  background:var(--glass);
  color:var(--text);
  align-items:center;
  justify-content:center;
  font-size:18px;
}

/* ============ buttons ============ */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:48px;
  padding:0 26px;
  border-radius:999px;
  font-weight:700;
  font-size:15px;
  border:1px solid transparent;
  cursor:pointer;
  transition:transform .18s ease,box-shadow .22s ease,background .22s ease,filter .2s ease;
}
.btn i{transition:transform .2s ease}
.btn-main{
  background:linear-gradient(120deg,var(--brand),var(--brand-2));
  color:#04121E;
  box-shadow:var(--glow-brand);
}
.btn-main:hover{filter:brightness(1.08);box-shadow:0 0 0 1px rgba(31,182,255,.45),0 14px 38px rgba(31,182,255,.34);color:#04121E}
.btn-main:hover i{transform:translateX(3px)}
.btn-main:active{transform:translateY(1px)}
.btn-ghost{
  background:var(--glass);
  border-color:rgba(31,182,255,.42);
  color:var(--text);
  backdrop-filter:blur(12px);
}
.btn-ghost:hover{background:rgba(31,182,255,.12);color:var(--text)}
.btn-ghost:active{transform:translateY(1px)}
.btn-sm{min-height:44px;padding:0 20px;font-size:14px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}

/* ============ cards ============ */
.glass-card{
  background:var(--glass);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  backdrop-filter:blur(16px) saturate(120%);
  -webkit-backdrop-filter:blur(16px) saturate(120%);
  padding:24px;
  position:relative;
  overflow:hidden;
}
.glass-card::before{
  content:"";
  position:absolute;
  left:-1px;top:-1px;
  width:120px;height:120px;
  background:radial-gradient(circle at 0 0,rgba(31,182,255,.22),transparent 70%);
  opacity:0;
  transition:opacity .28s ease;
  pointer-events:none;
}
.glass-card:hover::before{opacity:1}

/* ============ category hero ============ */
.cat-hero{
  position:relative;
  overflow:hidden;
  padding:76px 0 68px;
  border-bottom:1px solid var(--line-soft);
}
.cat-hero-bg{
  position:absolute;
  inset:0;
  background-size:cover;
  background-position:center 30%;
  filter:saturate(.8);
}
.cat-hero-bg::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(100deg,rgba(6,11,20,.92) 6%,rgba(6,11,20,.78) 48%,rgba(11,20,33,.72) 100%);
}
.cat-hero::after{
  content:"";
  position:absolute;
  inset:0;
  background:radial-gradient(620px 340px at 82% 18%,rgba(31,182,255,.20),transparent 68%);
  pointer-events:none;
}
.cat-hero-inner{max-width:900px}
.crumb{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--text-3);margin-bottom:20px}
.crumb a{color:var(--text-3)}
.crumb a:hover{color:var(--brand)}
.crumb span{color:var(--text-3)}
.tag-pill{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:12px;
  letter-spacing:.14em;
  color:var(--brand-2);
  background:rgba(37,224,200,.08);
  border:1px solid rgba(37,224,200,.28);
  border-radius:999px;
  padding:6px 14px;
  margin-bottom:20px;
}
.cat-hero h1{
  font-size:clamp(1.9rem,4.2vw,3.1rem);
  line-height:1.15;
  letter-spacing:-.02em;
  max-width:760px;
}
.cat-sub{color:var(--text-2);font-size:17px;margin-top:18px;max-width:640px}
.cat-meta{display:flex;flex-wrap:wrap;gap:12px;margin-top:34px}
.cat-meta li{
  display:flex;
  align-items:center;
  gap:9px;
  font-size:13px;
  color:var(--text-2);
  background:var(--glass);
  border:1px solid var(--line);
  border-radius:999px;
  padding:8px 16px;
}
.cat-meta li i{color:var(--brand-2)}

/* ============ overview ============ */
.grid-2{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:start}
.checklist h3{font-size:1.05rem;margin-bottom:18px}
.checklist li{
  display:flex;
  gap:12px;
  padding:13px 0;
  border-bottom:1px dashed var(--line-soft);
  font-size:15px;
  color:var(--text-2);
}
.checklist li:last-child{border-bottom:0}
.checklist li i{color:var(--brand);margin-top:6px}
.stat-row{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:22px}
.stat{
  background:rgba(255,255,255,.03);
  border:1px solid var(--line-soft);
  border-radius:12px;
  padding:14px 16px;
}
.stat b{display:block;font-family:var(--font-mono);font-size:1.3rem;color:var(--accent)}
.stat span{font-size:13px;color:var(--text-3)}

/* ============ steps ============ */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;counter-reset:step}
.step{position:relative;padding-top:26px}
.step::before{
  counter-increment:step;
  content:"0" counter(step);
  font-family:var(--font-mono);
  font-size:13px;
  color:var(--accent);
  position:absolute;
  top:0;left:0;
  letter-spacing:.1em;
}
.step::after{
  content:"";
  position:absolute;
  top:8px;left:0;right:0;
  height:1px;
  background:linear-gradient(90deg,rgba(31,182,255,.45),rgba(31,182,255,0));
}
.step h3{font-size:1.05rem;margin:14px 0 10px}
.step p{font-size:14px;color:var(--text-2);margin:0;line-height:1.8}

/* ============ qa cards ============ */
.qa-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:28px}
.qa-card{padding:0;transition:transform .24s ease,border-color .24s ease,box-shadow .24s ease}
.qa-card:nth-child(even){margin-top:42px}
.qa-card:hover{transform:translateY(-4px);border-color:rgba(31,182,255,.3);box-shadow:0 22px 46px rgba(0,0,0,.36)}
.qa-thumb{overflow:hidden;border-radius:var(--r-card) var(--r-card) 0 0;aspect-ratio:16/9;background:var(--bg-700)}
.qa-thumb img{width:100%;height:100%;object-fit:cover;filter:saturate(.82);transition:transform .4s ease,filter .3s ease}
.qa-card:hover .qa-thumb img{transform:scale(1.03);filter:saturate(1.02)}
.qa-body{padding:24px}
.qa-body h3{font-size:1.125rem;line-height:1.5;margin:14px 0 10px}
.qa-body p{font-size:14.5px;color:var(--text-2);margin:0 0 18px;line-height:1.85}
.chip{
  display:inline-flex;
  align-items:center;
  font-size:12px;
  letter-spacing:.06em;
  color:var(--brand);
  background:rgba(31,182,255,.12);
  border-radius:999px;
  padding:5px 12px;
}
.link-more{display:inline-flex;align-items:center;gap:8px;font-size:14px;color:var(--brand);font-weight:600}
.link-more i{transition:transform .2s ease}
.link-more:hover i{transform:translateX(3px)}

/* ============ faq ============ */
.accordion{
  --bs-accordion-bg:transparent;
  --bs-accordion-border-color:transparent;
  --bs-accordion-btn-color:var(--text);
  --bs-accordion-btn-bg:transparent;
  --bs-accordion-active-bg:transparent;
  --bs-accordion-active-color:#fff;
  --bs-accordion-btn-focus-box-shadow:none;
  --bs-accordion-border-radius:var(--r-card);
  max-width:920px;
}
.accordion-item{
  background:var(--glass);
  border:1px solid var(--line);
  border-radius:var(--r-card) !important;
  margin-bottom:14px;
  overflow:hidden;
  position:relative;
  backdrop-filter:blur(14px);
}
.accordion-item::before{
  content:"";
  position:absolute;
  left:0;top:0;bottom:0;
  width:3px;
  background:linear-gradient(180deg,var(--brand),var(--brand-2));
  opacity:0;
  transition:opacity .22s ease;
  box-shadow:0 0 18px rgba(31,182,255,.7);
  z-index:2;
}
.accordion-item:has(.accordion-button:not(.collapsed))::before{opacity:1}
.accordion-button{
  min-height:56px;
  padding:18px 56px 18px 26px;
  font-size:16px;
  font-weight:600;
  background:transparent;
  color:var(--text);
  box-shadow:none !important;
  transition:background .22s ease,color .22s ease;
}
.accordion-button:hover{color:var(--brand)}
.accordion-button:not(.collapsed){color:#fff;background:rgba(31,182,255,.05)}
.accordion-button::after{
  content:"\f078";
  font-family:"Font Awesome 6 Free";
  font-weight:900;
  font-size:13px;
  color:var(--brand-2);
  background-image:none;
  width:28px;height:28px;
  display:grid;
  place-items:center;
  border-radius:50%;
  border:1px solid var(--line);
  transition:transform .22s ease,color .22s ease;
}
.accordion-button:not(.collapsed)::after{transform:rotate(180deg);color:var(--brand)}
.accordion-body{
  padding:4px 26px 22px;
  font-size:15px;
  color:var(--text-2);
  line-height:1.9;
  background:rgba(255,255,255,.02);
}
.accordion-collapse{transition:height .22s ease}

/* ============ cross links ============ */
.cross-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.cross-card{
  display:block;
  background:var(--glass);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  padding:26px 24px;
  transition:transform .24s ease,border-color .24s ease,box-shadow .24s ease;
}
.cross-card:hover{transform:translateY(-4px);border-color:rgba(31,182,255,.32);box-shadow:0 20px 40px rgba(0,0,0,.34);color:inherit}
.cross-card i{font-size:20px;color:var(--brand-2);margin-bottom:16px;display:block}
.cross-card h3{font-size:1.05rem;margin-bottom:10px}
.cross-card p{font-size:14px;color:var(--text-2);margin:0 0 16px}
.cross-card span{font-size:13px;color:var(--brand);display:inline-flex;align-items:center;gap:8px}

/* ============ cta band ============ */
.cta-band{
  background:var(--glass);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  padding:44px 40px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:28px;
  flex-wrap:wrap;
  backdrop-filter:blur(18px);
  position:relative;
  overflow:hidden;
}
.cta-band::after{
  content:"";
  position:absolute;
  right:-60px;top:-80px;
  width:340px;height:240px;
  background:radial-gradient(circle,rgba(255,138,61,.18),transparent 68%);
  pointer-events:none;
}
.cta-band h2{font-size:clamp(1.25rem,2.2vw,1.7rem);margin-bottom:8px}
.cta-band p{color:var(--text-2);margin:0;font-size:15px}

/* ============ footer ============ */
.site-footer{
  border-top:1px solid var(--line-soft);
  background:var(--bg-800);
  padding:66px 0 26px;
  margin-top:0;
  position:relative;
  z-index:2;
}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:0}
.footer-col{padding:0 26px;border-left:1px solid var(--line-soft)}
.footer-col:first-child{padding-left:0;border-left:0}
.footer-col:last-child{padding-right:0}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.footer-brand b{font-family:var(--font-mono);font-size:1.1rem;letter-spacing:.06em}
.footer-col p{font-size:13.5px;color:var(--text-3);line-height:1.85;margin:0}
.footer-col h4{font-size:14px;color:var(--text);margin-bottom:16px;letter-spacing:.06em}
.footer-col a{display:block;font-size:14px;color:var(--text-2);padding:6px 0}
.footer-col a:hover{color:var(--brand)}
.footer-bottom{
  margin-top:44px;
  padding-top:20px;
  border-top:1px solid var(--line-soft);
  display:flex;
  justify-content:space-between;
  gap:16px;
  flex-wrap:wrap;
  font-size:13px;
  color:var(--text-3);
}

/* ============ mobile bar ============ */
.mobile-bar{
  display:none;
  position:fixed;
  left:0;right:0;bottom:0;
  z-index:1060;
  background:rgba(8,15,26,.94);
  backdrop-filter:blur(16px);
  border-top:1px solid rgba(31,182,255,.32);
  box-shadow:0 -8px 26px rgba(0,0,0,.4);
  padding:8px 16px calc(8px + env(safe-area-inset-bottom));
  align-items:center;
  justify-content:space-between;
  gap:12px;
}
.mobile-bar span{font-size:13px;color:var(--text-2)}

/* ============ responsive ============ */
@media (max-width:1199px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:34px 0}
  .footer-col:nth-child(3){padding-left:0;border-left:0}
}
@media (max-width:991px){
  body{padding-bottom:76px}
  .section{padding:72px 0}
  .nav-toggle{display:flex}
  .nav-grid{min-height:64px;display:flex;justify-content:center}
  .brand-text small{letter-spacing:.16em;font-size:10px}
  .nav-left,.nav-right{
    position:fixed;
    top:64px;left:0;right:0;bottom:0;
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    gap:4px;
    padding:24px 24px calc(96px + env(safe-area-inset-bottom));
    background:linear-gradient(180deg,rgba(6,11,20,.98),rgba(11,20,33,.98));
    backdrop-filter:blur(20px);
    transform:translateX(100%);
    visibility:hidden;
    transition:transform .3s ease,visibility .3s ease;
    overflow-y:auto;
  }
  .nav-right{
    justify-content:flex-end;
    background:transparent;
    backdrop-filter:none;
    pointer-events:none;
    z-index:1041;
  }
  .nav-left{z-index:1040}
  .site-header.menu-open .nav-left,
  .site-header.menu-open .nav-right{transform:translateX(0);visibility:visible}
  .nav-side a{
    font-size:16px;
    padding:14px 4px;
    border-bottom:1px solid var(--line-soft);
  }
  .nav-side a::after{display:none}
  .nav-right a{pointer-events:auto}
  .nav-cta{justify-content:center;margin-top:14px;border-bottom:0 !important}
  .grid-2{grid-template-columns:1fr;gap:34px}
  .steps{grid-template-columns:1fr 1fr;gap:26px}
  .qa-grid{grid-template-columns:1fr;gap:22px}
  .qa-card:nth-child(even){margin-top:0}
  .cross-grid{grid-template-columns:1fr}
  .cat-hero{padding:56px 0 52px}
  .mobile-bar{display:flex}
  .cta-band{padding:32px 24px}
}
@media (max-width:767px){
  .wrap{padding:0 16px}
  .section{padding:56px 0}
  .section-lead{margin-bottom:32px}
  .steps{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-col{padding:0;border-left:0}
  .cta-band{flex-direction:column;align-items:flex-start}
  .hero-actions .btn{flex:1 1 auto;justify-content:center}
  .stat-row{grid-template-columns:1fr}
}