/* roulang page: index */
:root{
  --bg-deepest:#070B12;
  --bg-page:#0B1119;
  --bg-section:#111A25;
  --primary:#14A0A6;
  --primary-deep:#0C5B66;
  --accent:#FF6B35;
  --accent-light:#FF8A5C;
  --amber:#FFC24B;
  --text:#F2F6FA;
  --text-2:rgba(226,236,245,.68);
  --text-3:rgba(226,236,245,.42);
  --line:rgba(255,255,255,.08);
  --line-strong:rgba(255,255,255,.18);
  --r-sm:8px;
  --r:16px;
  --r-lg:20px;
  --r-pill:999px;
  --sh-card:0 8px 30px rgba(0,0,0,.35);
  --sh-float:0 16px 44px rgba(0,0,0,.45);
  --sh-glow:0 8px 24px rgba(255,107,53,.32);
  --sec-gap:72px;
}
@media (min-width:1024px){ :root{ --sec-gap:112px; } }

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg-page);color:var(--text);
  font-family:system-ui,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
p{margin:0}
h1,h2,h3,h4{margin:0;font-weight:700;letter-spacing:-.01em}
ul{margin:0;padding:0;list-style:none}
a:focus-visible,button:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}
::selection{background:rgba(20,160,166,.35)}

.wrap{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
@media (min-width:768px){ .wrap{padding:0 32px} }
@media (min-width:1280px){ .wrap{padding:0 40px} }

.section{padding:var(--sec-gap) 0;scroll-margin-top:88px}
.section-alt{background:var(--bg-section)}
.section-line{border-top:1px solid var(--line)}

.overline{
  display:inline-block;font-size:12px;letter-spacing:.16em;color:var(--primary);
  text-transform:uppercase;margin-bottom:14px;font-weight:600;
}
.section-head{max-width:720px;margin-bottom:32px}
.section-title{font-size:clamp(24px,3.4vw,38px);line-height:1.25}
.section-sub{margin-top:14px;color:var(--text-2);font-size:16px}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  border-bottom:1px solid transparent;
  transition:background .3s ease,border-color .3s ease,backdrop-filter .3s ease;
}
.site-header.is-scrolled{
  background:rgba(11,17,25,.72);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom-color:var(--line);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;height:60px}
@media (min-width:768px){ .header-inner{height:72px} }

.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0}
.brand-dot{
  width:8px;height:8px;background:var(--primary);transform:rotate(45deg);
  display:inline-block;flex-shrink:0;box-shadow:0 0 12px rgba(20,160,166,.8);
}
.brand-name{font-size:17px;font-weight:700;letter-spacing:.02em;white-space:nowrap}
@media (min-width:1024px){ .brand-name{font-size:18px} }

.nav-desktop{display:none;align-items:center;gap:32px}
@media (min-width:768px){ .nav-desktop{display:flex} }
.nav-link{
  position:relative;font-size:15px;font-weight:500;color:var(--text-2);
  padding:6px 0;transition:color .2s ease;
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--primary);transform:scaleX(0);transform-origin:left;
  transition:transform .25s ease;
}
.nav-link:hover{color:var(--text)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link.is-active{color:var(--text)}
.nav-link.is-active::after{transform:scaleX(1)}

.nav-actions{display:flex;align-items:center;gap:12px}
.nav-actions .btn{display:none}
@media (min-width:768px){ .nav-actions .btn{display:inline-flex} }
@media (min-width:1024px){ .nav-actions .btn{display:inline-flex} }

.hamburger{
  width:42px;height:42px;display:inline-flex;flex-direction:column;justify-content:center;
  align-items:center;gap:5px;border:1px solid var(--line);border-radius:var(--r-pill);
}
.hamburger span{display:block;width:16px;height:1.5px;background:var(--text);transition:transform .25s ease,opacity .25s ease}
.hamburger.is-open span:nth-child(1){transform:translateY(6.5px) rotate(45deg)}
.hamburger.is-open span:nth-child(2){opacity:0}
.hamburger.is-open span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg)}
@media (min-width:768px){ .hamburger{display:none} }

.mobile-drawer{
  position:fixed;inset:0;z-index:55;background:rgba(7,11,18,.98);
  padding:96px 24px 40px;display:flex;flex-direction:column;gap:6px;
  opacity:0;visibility:hidden;transform:translateY(-8px);
  transition:opacity .2s ease,transform .2s ease,visibility .2s;
}
.mobile-drawer.is-open{opacity:1;visibility:visible;transform:none}
@media (min-width:768px){ .mobile-drawer{display:none} }
.drawer-link{
  display:flex;align-items:center;gap:12px;
  padding:16px 4px;font-size:18px;color:var(--text-2);
  border-bottom:1px solid var(--line);transition:color .2s ease;
}
.drawer-link::before{
  content:"";width:3px;height:18px;border-radius:2px;background:transparent;transition:background .2s ease;
}
.drawer-link:hover,.drawer-link.is-active{color:var(--text)}
.drawer-link.is-active::before{background:var(--primary)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 24px;border-radius:var(--r-pill);
  font-size:15px;font-weight:600;letter-spacing:.01em;
  transition:transform .18s ease,box-shadow .25s ease,background .2s ease,border-color .2s ease,color .2s ease;
  white-space:nowrap;
}
.btn-sm{height:40px;padding:0 18px;font-size:14px}
.btn-lg{height:54px;padding:0 30px;font-size:16px}
.btn-primary{background:var(--accent);color:#0B1119;box-shadow:var(--sh-glow)}
.btn-primary:hover{background:var(--accent-light);transform:translateY(-2px);box-shadow:0 12px 30px rgba(255,107,53,.4)}
.btn-primary:active{transform:translateY(1px)}
.btn-ghost{border:1px solid var(--line-strong);color:var(--text);background:transparent}
.btn-ghost:hover{border-color:var(--primary);background:rgba(255,255,255,.06)}
.btn-ghost:active{transform:translateY(1px)}
.btn-text{
  color:var(--text-2);font-size:15px;font-weight:600;
  border-bottom:1px solid transparent;padding-bottom:2px;transition:color .2s ease,border-color .2s ease;
}
.btn-text:hover{color:var(--primary);border-bottom-color:var(--primary)}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line)}
.hero-bg{
  position:absolute;inset:0;
  background-image:linear-gradient(rgba(7,11,18,.62),rgba(7,11,18,.94)),url('/assets/images/backpic/back-1.png');
  background-size:cover;background-position:center;
}
.hero-glow{
  position:absolute;width:640px;height:640px;right:-160px;top:-220px;
  background:radial-gradient(circle,rgba(20,160,166,.16),transparent 68%);
  pointer-events:none;
}
.hero-grid{position:relative;display:grid;grid-template-columns:1fr;gap:48px;padding:84px 0 72px}
@media (min-width:768px){ .hero-grid{padding:110px 0 96px} }
@media (min-width:1024px){
  .hero{min-height:88vh;display:flex;align-items:center}
  .hero-grid{grid-template-columns:1.12fr .88fr;align-items:center;gap:56px;padding:120px 0 110px;width:100%}
}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-size:12px;letter-spacing:.16em;color:var(--text-2);
  border:1px solid var(--line);border-radius:var(--r-pill);padding:8px 16px;margin-bottom:24px;
}
.eyebrow i{width:6px;height:6px;border-radius:50%;background:var(--primary);display:block}
.hero-title{font-size:clamp(30px,5.2vw,54px);line-height:1.12;font-weight:800;letter-spacing:-.02em}
.hero-sub{margin-top:22px;font-size:16px;line-height:1.8;color:var(--text-2);max-width:560px}
@media (min-width:1024px){ .hero-sub{font-size:17px} }
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:34px}
.hero-facts{display:flex;flex-wrap:wrap;gap:22px;margin-top:38px;font-size:13px;color:var(--text-3)}

.glass{
  background:rgba(255,255,255,.04);
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  box-shadow:var(--sh-card);
  padding:28px 26px;
  transition:transform .3s ease,border-color .3s ease,box-shadow .3s ease;
}
.glass:hover{transform:translateY(-4px);border-color:rgba(20,160,166,.32);box-shadow:var(--sh-float)}
.hero-card-title{font-size:15px;font-weight:600;color:var(--text-2);letter-spacing:.04em}
.stat-list{margin-top:20px;display:flex;flex-direction:column}
.stat{display:flex;align-items:baseline;justify-content:space-between;gap:16px;padding:16px 0;border-top:1px solid var(--line)}
.stat:first-child{border-top:0;padding-top:6px}
.stat-num{font-size:32px;font-weight:700;color:var(--accent);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.stat-label{font-size:14px;color:var(--text-2)}
.stat-note{margin-top:14px;font-size:13px;color:var(--text-3)}

/* ---------- trust ---------- */
.trust-bar{display:flex;flex-wrap:wrap;gap:14px 34px;padding:24px 0;border-bottom:1px solid var(--line)}
@media (min-width:768px){ .trust-bar{padding:26px 0;gap:18px 46px} }
.trust-item{display:inline-flex;align-items:center;gap:9px;font-size:13px;color:var(--text-2);letter-spacing:.02em}
.trust-item::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--primary);flex-shrink:0}

/* ---------- value ---------- */
.value-grid{display:grid;grid-template-columns:1fr;gap:24px}
@media (min-width:768px){ .value-grid{grid-template-columns:1fr 1fr} }
@media (min-width:1024px){
  .value-grid{grid-template-columns:1.15fr 1.15fr .7fr}
  .value-card--wide{grid-column:auto}
}
.card{
  background:var(--bg-section);
  border:1px solid var(--line);
  border-radius:var(--r);
  padding:30px 28px;
  box-shadow:var(--sh-card);
  position:relative;
  transition:transform .3s ease,border-color .3s ease,box-shadow .3s ease;
}
.card:hover{transform:translateY(-4px);border-color:rgba(20,160,166,.35);box-shadow:var(--sh-float)}
.card-num{
  font-size:12px;letter-spacing:.18em;color:var(--primary);
  font-variant-numeric:tabular-nums;margin-bottom:16px;display:block;
}
.card h3{font-size:20px;line-height:1.4;margin-bottom:12px}
.card p{color:var(--text-2);font-size:15px}
.card--accent{border-top:3px solid var(--accent)}
.card-icon{
  width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  background:rgba(20,160,166,.12);color:var(--primary);font-size:19px;margin-bottom:18px;font-weight:700;
}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.tag{
  font-size:12px;padding:5px 12px;border-radius:var(--r-pill);
  background:rgba(20,160,166,.12);color:var(--primary);
}
.tag-amber{background:rgba(255,194,75,.14);color:var(--amber)}

/* ---------- showcase ---------- */
.showcase-row{
  display:grid;grid-template-columns:1fr;gap:32px;align-items:center;
  padding:36px 0;border-top:1px solid var(--line);
}
.showcase-row:first-of-type{border-top:0}
@media (min-width:1024px){
  .showcase-row{grid-template-columns:1fr 1fr;gap:64px;padding:52px 0}
  .showcase-row.is-reverse .showcase-media{order:2}
  .showcase-row.is-reverse .showcase-text{order:1}
}
.showcase-media{
  position:relative;border-radius:var(--r-lg);overflow:hidden;
  border:1px solid var(--line);box-shadow:var(--sh-card);
}
.showcase-media img{width:100%;aspect-ratio:16/10;object-fit:cover;transition:transform .5s ease}
.showcase-media:hover img{transform:scale(1.03)}
.showcase-index{
  font-size:13px;font-weight:700;letter-spacing:.2em;color:var(--amber);
  font-variant-numeric:tabular-nums;display:block;margin-bottom:14px;
}
.showcase-text h3{font-size:clamp(22px,2.4vw,28px);line-height:1.32;margin-bottom:16px}
.showcase-text p{color:var(--text-2);font-size:16px}
.check-list{margin-top:22px;display:flex;flex-direction:column;gap:12px}
.check-list li{display:flex;gap:12px;font-size:15px;color:var(--text-2)}
.check-list li::before{
  content:"";flex-shrink:0;width:6px;height:6px;margin-top:9px;
  background:var(--primary);transform:rotate(45deg);
}

/* ---------- proof ---------- */
.quote{
  font-family:"Noto Serif SC",Georgia,serif;
  font-size:clamp(20px,2.6vw,30px);line-height:1.55;color:var(--text);
  max-width:900px;padding-left:26px;border-left:2px solid var(--primary);
}
.data-bar{
  display:grid;grid-template-columns:1fr;gap:0;margin:44px 0 40px;
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
}
@media (min-width:768px){ .data-bar{grid-template-columns:repeat(3,1fr)} }
.data-item{padding:26px 0;border-top:1px solid var(--line)}
.data-item:first-child{border-top:0}
@media (min-width:768px){
  .data-item{border-top:0;border-left:1px solid var(--line);padding:30px 28px}
  .data-item:first-child{border-left:0;padding-left:0}
}
.data-num{font-size:clamp(28px,3.4vw,40px);font-weight:700;color:var(--text);font-variant-numeric:tabular-nums}
.data-num span{font-size:15px;color:var(--text-3);font-weight:500;margin-left:6px}
.data-label{margin-top:8px;font-size:14px;color:var(--text-2)}
.proof-cards{display:grid;grid-template-columns:1fr;gap:20px;align-items:start}
@media (min-width:768px){ .proof-cards{grid-template-columns:repeat(3,1fr)} }
.proof-card{
  background:rgba(255,255,255,.03);border:1px solid var(--line);border-radius:var(--r);
  padding:26px 24px;transition:border-color .3s ease,transform .3s ease;
}
.proof-card:hover{border-color:rgba(20,160,166,.35);transform:translateY(-4px)}
.proof-card h4{font-size:17px;margin-bottom:10px}
.proof-card p{font-size:14px;color:var(--text-2)}
.proof-card .badge-cat{margin-bottom:14px}

/* ---------- timeline ---------- */
.timeline{display:grid;grid-template-columns:1fr;gap:0;margin-top:8px}
@media (min-width:768px){ .timeline{grid-template-columns:repeat(4,1fr);gap:0} }
.tl-item{
  position:relative;padding:28px 0 28px 30px;border-left:1px solid var(--line);
}
@media (min-width:768px){
  .tl-item{padding:34px 24px 34px 0;border-left:0;border-top:2px solid var(--line)}
  .tl-item:first-child{padding-left:0}
  .tl-item::before{
    content:"";position:absolute;top:-6px;left:0;width:10px;height:10px;border-radius:50%;
    background:var(--primary);box-shadow:0 0 0 4px rgba(20,160,166,.16);
  }
  .tl-item:first-child::before{left:0}
}
.tl-num{font-size:13px;font-weight:700;letter-spacing:.2em;color:var(--primary);font-variant-numeric:tabular-nums}
.tl-title{margin-top:12px;font-size:19px;font-weight:600}
.tl-desc{margin-top:10px;font-size:14px;color:var(--text-2)}

/* ---------- news ---------- */
.news-grid{display:grid;grid-template-columns:1fr;gap:22px}
@media (min-width:640px){ .news-grid{grid-template-columns:repeat(2,1fr)} }
@media (min-width:1024px){ .news-grid{grid-template-columns:repeat(3,1fr)} }
.news-card{
  display:flex;flex-direction:column;height:100%;
  background:var(--bg-page);border:1px solid var(--line);border-radius:var(--r);
  padding:24px 22px;position:relative;overflow:hidden;
  transition:transform .3s ease,border-color .3s ease,box-shadow .3s ease;
}
.news-card::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:2px;background:var(--primary);
  transform:scaleY(0);transform-origin:top;transition:transform .3s ease;
}
.news-card:hover{transform:translateY(-4px);border-color:rgba(20,160,166,.35);box-shadow:var(--sh-float)}
.news-card:hover::before{transform:scaleY(1)}
.news-card:hover .news-title{color:#fff}
.news-badge{
  align-self:flex-start;font-size:12px;padding:4px 12px;border-radius:var(--r-pill);
  background:rgba(255,194,75,.14);color:var(--amber);margin-bottom:14px;
}
.news-title{
  font-size:18px;line-height:1.45;margin-bottom:10px;transition:color .25s ease;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.news-desc{
  font-size:14px;color:var(--text-2);flex:1;
  display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;
}
.news-foot{
  display:flex;align-items:center;justify-content:space-between;
  margin-top:20px;padding-top:14px;border-top:1px solid var(--line);
  font-size:12px;color:var(--text-3);font-variant-numeric:tabular-nums;
}
.news-arrow{color:var(--primary);font-size:15px;transition:transform .25s ease}
.news-card:hover .news-arrow{transform:translateX(4px)}
.empty-state{
  min-height:220px;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:14px;text-align:center;border:1px dashed var(--line-strong);border-radius:var(--r);
  padding:40px 24px;
}
.empty-icon{
  width:52px;height:52px;border-radius:50%;border:1px solid var(--line-strong);
  display:flex;align-items:center;justify-content:center;color:var(--text-3);font-size:20px;
}
.empty-state p{color:var(--text-2);font-size:15px}

/* ---------- faq ---------- */
.faq-list{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{
  list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:22px 0;font-size:17px;font-weight:500;transition:color .2s ease;
}
.faq-q::-webkit-details-marker{display:none}
.faq-q:hover{color:var(--primary)}
.faq-icon{position:relative;width:14px;height:14px;flex-shrink:0;transition:transform .2s ease}
.faq-icon::before,.faq-icon::after{
  content:"";position:absolute;background:var(--primary);border-radius:2px;
}
.faq-icon::before{left:0;top:6px;width:14px;height:1.5px}
.faq-icon::after{top:0;left:6px;width:1.5px;height:14px}
details[open] .faq-icon{transform:rotate(45deg)}
.faq-a{padding:0 0 24px;font-size:15px;line-height:1.8;color:var(--text-2);max-width:820px}

/* ---------- cta band ---------- */
.cta-band{background:var(--bg-deepest);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:64px 0}
@media (min-width:1024px){ .cta-band{padding:76px 0} }
.cta-inner{display:flex;flex-direction:column;gap:26px;align-items:flex-start}
@media (min-width:1024px){
  .cta-inner{flex-direction:row;align-items:center;justify-content:space-between;gap:48px}
}
.cta-text h2{font-size:clamp(22px,2.8vw,32px);line-height:1.3}
.cta-text p{margin-top:12px;color:var(--text-2);font-size:15px;max-width:620px}

/* ---------- footer ---------- */
.site-footer{background:var(--bg-deepest);padding:64px 0 0}
.footer-grid{display:grid;grid-template-columns:1fr;gap:38px;padding-bottom:48px}
@media (min-width:640px){ .footer-grid{grid-template-columns:repeat(2,1fr)} }
@media (min-width:1024px){ .footer-grid{grid-template-columns:1.5fr 1fr 1fr 1fr;gap:48px} }
.footer-brand{display:inline-flex;align-items:center;gap:10px;margin-bottom:16px}
.footer-brand .brand-dot{width:7px;height:7px}
.footer-brand span{font-size:17px;font-weight:700}
.footer-desc{font-size:14px;color:var(--text-2);max-width:340px}
.footer-title{font-size:14px;font-weight:600;margin-bottom:18px;color:var(--text)}
.footer-links{display:flex;flex-direction:column;gap:12px}
.footer-links a,.footer-links span{font-size:14px;color:var(--text-2);transition:color .2s ease}
.footer-links a:hover{color:var(--primary)}
.footer-bottom{
  border-top:1px solid var(--line);padding:22px 0 30px;
  display:flex;flex-direction:column;gap:12px;font-size:13px;color:var(--text-3);
}
@media (min-width:768px){ .footer-bottom{flex-direction:row;align-items:center;justify-content:space-between} }

/* ---------- float cta ---------- */
.float-cta{
  position:fixed;right:24px;bottom:28px;z-index:50;display:flex;align-items:center;gap:10px;
  background:rgba(17,26,37,.86);border:1px solid var(--line);border-radius:var(--r-pill);
  padding:8px 10px 8px 20px;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  box-shadow:var(--sh-float);
  opacity:0;visibility:hidden;transform:translateY(14px);
  transition:opacity .3s ease,transform .3s ease,visibility .3s;
}
.float-cta.is-visible{opacity:1;visibility:visible;transform:none}
.float-cta .float-label{font-size:14px;color:var(--text-2);white-space:nowrap}
.float-top{
  width:40px;height:40px;border-radius:50%;border:1px solid var(--line-strong);
  display:flex;align-items:center;justify-content:center;font-size:15px;color:var(--text-2);
  transition:border-color .2s ease,color .2s ease;
}
.float-top:hover{border-color:var(--primary);color:var(--primary)}
@media (max-width:767px){
  .float-cta{
    left:0;right:0;bottom:0;border-radius:0;border-left:0;border-right:0;border-bottom:0;
    padding:10px 16px calc(10px + env(safe-area-inset-bottom));
    justify-content:space-between;gap:12px;
  }
  .float-cta .btn{flex:1;height:46px}
  .float-cta .float-label{display:none}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
}

/* roulang page: article */
:root{
  --bg-deep:#070B12;
  --bg:#0B1119;
  --bg-soft:#111A25;
  --primary:#14A0A6;
  --primary-deep:#0C5B66;
  --accent:#FF6B35;
  --accent-light:#FF8A5C;
  --amber:#FFC24B;
  --text:#F2F6FA;
  --text-2:rgba(226,236,245,.68);
  --text-3:rgba(226,236,245,.42);
  --line:rgba(255,255,255,.08);
  --line-strong:rgba(255,255,255,.16);
  --radius-sm:8px;
  --radius:16px;
  --radius-lg:20px;
  --shadow:0 8px 30px rgba(0,0,0,.35);
  --shadow-hover:0 16px 44px rgba(0,0,0,.45);
  --glow:0 8px 24px rgba(255,107,53,.32);
  --font:system-ui,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  --serif:"Noto Serif SC",Georgia,serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--font);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border-style:none}
a{color:inherit;text-decoration:none;background-color:transparent}
button{font-family:inherit}
h1,h2,h3,h4,p,ul,ol,figure{margin:0}
ul,ol{padding-left:0;list-style:none}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
::selection{background:rgba(20,160,166,.35)}
section[id]{scroll-margin-top:88px}
.wrap{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
@media (min-width:768px){.wrap{padding:0 32px}}
@media (min-width:1280px){.wrap{padding:0 40px}}

/* ---------- 导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background .25s ease,border-color .25s ease,backdrop-filter .25s ease;
}
.site-header.is-scrolled{
  background:rgba(11,17,25,.72);
  border-bottom-color:var(--line);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;height:72px}
@media (max-width:767px){.header-inner{height:60px}}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:800;font-size:19px;letter-spacing:-.01em;color:var(--text)}
.brand-dot{width:9px;height:9px;border-radius:2px;background:var(--primary);transform:rotate(45deg);box-shadow:0 0 12px rgba(20,160,166,.85);flex:0 0 auto}
.brand-name{white-space:nowrap}
.nav-desktop{display:flex;align-items:center;gap:32px}
.nav-link{position:relative;padding:6px 0;font-size:15px;font-weight:500;color:var(--text-2);transition:color .2s ease}
.nav-link::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;border-radius:2px;background:var(--primary);transform:scaleX(0);transform-origin:left;transition:transform .22s ease}
.nav-link:hover{color:var(--text)}
.nav-link.is-active{color:var(--text)}
.nav-link.is-active::after{transform:scaleX(1)}
.nav-actions{display:flex;align-items:center;gap:12px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 24px;border-radius:999px;
  font-size:15px;font-weight:600;letter-spacing:.01em;
  border:1px solid transparent;cursor:pointer;
  transition:background .2s ease,border-color .2s ease,transform .12s ease,box-shadow .2s ease,color .2s ease;
}
.btn-sm{height:40px;padding:0 18px;font-size:14px}
.btn-primary{background:var(--accent);color:#0B1119;box-shadow:var(--glow)}
.btn-primary:hover{background:var(--accent-light);transform:translateY(-1px);box-shadow:0 12px 30px rgba(255,107,53,.42)}
.btn-primary:active{transform:translateY(1px)}
.btn-ghost{background:transparent;border-color:rgba(255,255,255,.18);color:var(--text)}
.btn-ghost:hover{border-color:var(--primary);background:rgba(255,255,255,.06)}
.btn-block{width:100%}
.hamburger{
  display:none;width:42px;height:42px;border-radius:12px;
  border:1px solid var(--line);background:rgba(255,255,255,.04);
  flex-direction:column;align-items:center;justify-content:center;gap:5px;cursor:pointer;
}
.hamburger span{display:block;width:17px;height:1.5px;background:var(--text);border-radius:2px;transition:transform .2s ease,opacity .2s ease}
.hamburger.is-open span:nth-child(1){transform:translateY(6.5px) rotate(45deg)}
.hamburger.is-open span:nth-child(2){opacity:0}
.hamburger.is-open span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg)}
@media (max-width:767px){
  .nav-desktop{display:none}
  .hamburger{display:flex}
  .hide-sm{display:none}
}
/* 移动抽屉 */
.mobile-drawer{
  position:fixed;inset:0;z-index:70;
  background:rgba(7,11,18,.97);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  display:flex;flex-direction:column;
  padding:20px 20px calc(28px + env(safe-area-inset-bottom));
  opacity:0;visibility:hidden;pointer-events:none;
  transition:opacity .2s ease,visibility .2s ease;
}
.mobile-drawer.is-open{opacity:1;visibility:visible;pointer-events:auto}
.drawer-head{display:flex;align-items:center;justify-content:space-between;height:60px}
.drawer-close{width:42px;height:42px;border-radius:12px;border:1px solid var(--line);background:rgba(255,255,255,.04);color:var(--text);font-size:20px;line-height:1;cursor:pointer}
.drawer-nav{display:flex;flex-direction:column;gap:4px;margin-top:26px}
.drawer-link{
  display:flex;align-items:center;gap:12px;
  padding:16px 4px;font-size:18px;font-weight:600;color:var(--text-2);
  border-bottom:1px solid var(--line);
}
.drawer-link::before{content:"";width:3px;height:18px;border-radius:2px;background:transparent}
.drawer-link:hover,.drawer-link.is-active{color:var(--text)}
.drawer-link:hover::before,.drawer-link.is-active::before{background:var(--primary)}
.drawer-foot{margin-top:auto;padding-top:24px;display:flex;flex-direction:column;gap:12px}
.drawer-note{font-size:13px;color:var(--text-3);line-height:1.7}

/* ---------- 文章头 ---------- */
.article-top{padding:44px 0 0}
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:12px;letter-spacing:.04em;color:var(--text-3)}
.breadcrumb a{color:var(--text-3);transition:color .2s ease}
.breadcrumb a:hover{color:var(--primary)}
.breadcrumb .sep{color:rgba(226,236,245,.24)}
.breadcrumb .current{color:var(--text-2)}
.article-head{padding:22px 0 30px;border-bottom:1px solid var(--line)}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:12px;letter-spacing:.16em;color:var(--primary);text-transform:uppercase;margin-bottom:16px}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--primary);opacity:.7}
.article-title{
  font-size:clamp(28px,4.6vw,46px);
  font-weight:800;line-height:1.16;letter-spacing:-.02em;color:var(--text);
  max-width:900px;
}
.meta-row{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-top:20px;font-size:14px;color:var(--text-3)}
.badge{
  display:inline-flex;align-items:center;height:26px;padding:0 12px;
  border-radius:999px;font-size:12px;font-weight:600;letter-spacing:.05em;
  background:rgba(255,194,75,.12);color:var(--amber);
}
.badge-jade{background:rgba(20,160,166,.14);color:#5FD3D8}
.dot-sep{width:4px;height:4px;border-radius:50%;background:rgba(226,236,245,.28)}
.num{font-variant-numeric:tabular-nums;letter-spacing:.06em}

/* ---------- 正文 ---------- */
.article-wrap{padding:42px 0 0}
.article-body{
  max-width:760px;
  font-size:17px;line-height:1.9;color:var(--text-2);
}
.article-body > *:first-child{margin-top:0}
.article-body p{margin:0 0 22px}
.article-body h2{
  position:relative;margin:52px 0 18px;padding-left:14px;
  font-size:clamp(22px,2.8vw,28px);font-weight:700;line-height:1.35;color:var(--text);
}
.article-body h2::before{
  content:"";position:absolute;left:0;top:.2em;bottom:.2em;width:3px;border-radius:2px;background:var(--primary);
}
.article-body h3{margin:36px 0 14px;font-size:20px;font-weight:600;line-height:1.45;color:var(--text)}
.article-body h4{margin:26px 0 12px;font-size:17px;font-weight:600;color:var(--text)}
.article-body a{color:var(--primary);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.article-body a:hover{color:var(--accent-light)}
.article-body strong{color:var(--text);font-weight:600}
.article-body ul,.article-body ol{margin:0 0 24px;padding-left:22px}
.article-body ul{list-style:disc}
.article-body ol{list-style:decimal}
.article-body li{margin:9px 0;padding-left:4px}
.article-body li::marker{color:var(--primary)}
.article-body blockquote{
  margin:30px 0;padding:20px 24px;
  border-left:2px solid var(--primary);
  background:rgba(255,255,255,.04);
  border-radius:0 14px 14px 0;
  font-family:var(--serif);font-size:16.5px;line-height:1.9;color:var(--text-2);
}
.article-body blockquote p:last-child{margin-bottom:0}
.article-body img{border-radius:12px;margin:28px 0 10px;width:100%;height:auto}
.article-body figure{margin:28px 0}
.article-body figcaption{margin-top:10px;font-size:13px;color:var(--text-3);text-align:center}
.article-body hr{border:0;border-top:1px solid var(--line);margin:40px 0}
.article-body table{width:100%;border-collapse:collapse;margin:26px 0;font-size:15px}
.article-body th,.article-body td{padding:12px 14px;border:1px solid var(--line);text-align:left}
.article-body th{background:rgba(255,255,255,.04);color:var(--text);font-weight:600}
.article-body code{background:rgba(255,255,255,.06);padding:2px 6px;border-radius:6px;font-size:14px;color:#8FE3E6}
.article-body pre{background:var(--bg-deep);border:1px solid var(--line);border-radius:12px;padding:18px;overflow:auto;margin:24px 0}
.article-body pre code{background:none;padding:0}

.article-empty{
  max-width:760px;padding:56px 32px;border:1px solid var(--line);
  border-radius:var(--radius-lg);background:rgba(255,255,255,.03);text-align:center;
}
.article-empty h2{font-size:24px;color:var(--text);margin-bottom:12px}
.article-empty p{color:var(--text-2);margin-bottom:24px}

/* ---------- 文末 ---------- */
.article-foot{padding:46px 0 0;border-top:1px solid var(--line);margin-top:52px}
.tag-row{display:flex;flex-wrap:wrap;gap:10px}
.tag{
  display:inline-flex;align-items:center;height:32px;padding:0 15px;
  border-radius:999px;border:1px solid var(--line);
  font-size:13px;color:var(--text-2);transition:border-color .2s ease,color .2s ease,background .2s ease;
}
.tag:hover{border-color:var(--primary);color:#8FE3E6;background:rgba(20,160,166,.08)}
.rel-block{margin-top:52px}
.block-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:24px}
.block-title{font-size:clamp(20px,2.4vw,26px);font-weight:700;color:var(--text);letter-spacing:-.01em}
.block-note{font-size:13px;color:var(--text-3)}
.rel-list{display:grid;gap:16px}
.rel-card{
  display:grid;grid-template-columns:132px 1fr auto;gap:20px;align-items:center;
  padding:16px;border-radius:var(--radius);
  background:rgba(255,255,255,.03);border:1px solid var(--line);
  transition:transform .22s ease,border-color .22s ease,background .22s ease,box-shadow .22s ease;
}
.rel-card:hover{transform:translateY(-4px);border-color:rgba(20,160,166,.35);background:rgba(255,255,255,.05);box-shadow:var(--shadow)}
.rel-card img{width:132px;height:80px;object-fit:cover;border-radius:12px}
.rel-title{font-size:17px;font-weight:600;color:var(--text);line-height:1.45;margin-bottom:6px}
.rel-desc{font-size:13.5px;color:var(--text-3);line-height:1.7}
.rel-arrow{font-size:18px;color:var(--text-3);transition:color .2s ease,transform .2s ease;padding-right:6px}
.rel-card:hover .rel-arrow{color:var(--accent);transform:translateX(4px)}
@media (max-width:639px){
  .rel-card{grid-template-columns:1fr;gap:14px}
  .rel-card img{width:100%;height:168px}
  .rel-arrow{display:none}
}
.back-row{display:flex;flex-wrap:wrap;align-items:center;gap:16px;margin-top:36px}
.link-line{font-size:14px;color:var(--text-3);border-bottom:1px solid transparent;transition:color .2s ease,border-color .2s ease}
.link-line:hover{color:var(--primary);border-bottom-color:var(--primary)}

/* ---------- FAQ ---------- */
.section{padding:96px 0}
@media (max-width:767px){.section{padding:64px 0}}
.faq-list{border-top:1px solid var(--line);margin-top:28px}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:22px 0;background:none;border:0;text-align:left;cursor:pointer;
  font-size:17px;font-weight:600;color:var(--text);line-height:1.5;
  transition:color .2s ease;
}
.faq-q:hover{color:#8FE3E6}
.faq-icon{
  flex:0 0 auto;width:26px;height:26px;border-radius:50%;
  border:1px solid var(--line-strong);color:var(--text-2);
  display:inline-flex;align-items:center;justify-content:center;
  font-size:15px;line-height:1;transition:transform .2s ease,color .2s ease,border-color .2s ease;
}
.faq-item.is-open .faq-icon{transform:rotate(45deg);color:var(--accent);border-color:rgba(255,107,53,.5)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease}
.faq-a p{padding:0 0 22px;font-size:15px;line-height:1.85;color:var(--text-2);max-width:820px}

/* ---------- CTA 带 ---------- */
.cta-band{
  position:relative;background:var(--bg-deep);
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  overflow:hidden;
}
.cta-band::before{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(7,11,18,.82),rgba(7,11,18,.94)),url("/assets/images/backpic/back-2.webp");
  background-size:cover;background-position:center;opacity:.85;
}
.cta-inner{position:relative;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:26px;padding:64px 0}
.cta-inner h2{font-size:clamp(22px,2.8vw,32px);font-weight:700;letter-spacing:-.01em;color:var(--text);margin-bottom:10px}
.cta-inner p{font-size:15px;color:var(--text-2);max-width:620px}
@media (max-width:767px){.cta-inner{padding:52px 0}.cta-inner .btn{width:100%}}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--bg-deep);padding:72px 0 0;border-top:1px solid var(--line)}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px}
@media (max-width:1023px){.footer-grid{grid-template-columns:1fr 1fr;gap:34px}}
@media (max-width:639px){.footer-grid{grid-template-columns:1fr}}
.footer-brand{display:inline-flex;align-items:center;gap:10px;font-size:18px;font-weight:800;color:var(--text)}
.footer-desc{margin-top:16px;font-size:14px;line-height:1.85;color:var(--text-3);max-width:340px}
.footer-title{font-size:13px;letter-spacing:.12em;color:var(--text-3);text-transform:uppercase;margin-bottom:18px}
.footer-links{display:flex;flex-direction:column;gap:12px;font-size:14px;color:var(--text-2)}
.footer-links a{color:var(--text-2);transition:color .2s ease}
.footer-links a:hover{color:var(--primary)}
.footer-links span{color:var(--text-3);font-size:13.5px;line-height:1.7}
.footer-bottom{
  margin-top:56px;padding:22px 0 30px;border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;
  font-size:13px;color:var(--text-3);
}

/* ---------- 浮动 CTA ---------- */
.float-cta{
  position:fixed;right:32px;bottom:32px;z-index:50;
  display:inline-flex;align-items:center;gap:10px;
  height:56px;padding:0 10px 0 26px;border-radius:999px;
  background:var(--accent);box-shadow:var(--glow);
  opacity:0;transform:translateY(14px);pointer-events:none;
  transition:opacity .3s ease,transform .3s ease;
}
.float-cta.is-on{opacity:1;transform:none;pointer-events:auto}
.float-cta > a{font-size:15px;font-weight:600;color:#0B1119;white-space:nowrap}
.to-top{
  display:none;width:38px;height:38px;border-radius:50%;border:0;
  background:rgba(11,17,25,.9);color:var(--text);font-size:15px;cursor:pointer;
  transition:background .2s ease;
}
.to-top:hover{background:#0B1119}
@media (max-width:639px){
  .float-cta{
    left:16px;right:16px;bottom:calc(14px + env(safe-area-inset-bottom));
    justify-content:space-between;padding:0 10px 0 20px;
  }
  .to-top{display:inline-flex;align-items:center;justify-content:center}
}

/* roulang page: category1 */
:root{
  --bg:#0B1119;
  --bg-deep:#070B12;
  --bg-soft:#111A25;
  --primary:#14A0A6;
  --primary-dim:#5FD1D6;
  --primary-deep:#0C5B66;
  --accent:#FF6B35;
  --accent-light:#FF8A5C;
  --amber:#FFC24B;
  --text:#F2F6FA;
  --text-2:rgba(226,236,245,.68);
  --text-3:rgba(226,236,245,.42);
  --line:rgba(255,255,255,.08);
  --card:rgba(255,255,255,.04);
  --radius-s:8px;
  --radius-m:16px;
  --radius-l:20px;
  --shadow:0 8px 30px rgba(0,0,0,.35);
  --shadow-hover:0 16px 44px rgba(0,0,0,.45);
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:system-ui,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto;}
a{color:inherit;text-decoration:none;transition:color .2s ease,opacity .2s ease;}
button{font-family:inherit;}
[id]{scroll-margin-top:88px;}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px;}

.wrap{width:100%;max-width:1200px;margin:0 auto;padding:0 20px;}
@media(min-width:768px){.wrap{padding:0 32px;}}
@media(min-width:1280px){.wrap{padding:0 40px;}}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background .25s ease,border-color .25s ease,backdrop-filter .25s ease;
}
.site-header.is-scrolled{
  background:rgba(11,17,25,.72);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom-color:var(--line);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;height:60px;}
@media(min-width:768px){.header-inner{height:72px;}}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:700;}
.brand-dot{width:8px;height:8px;background:var(--primary);border-radius:2px;transform:rotate(45deg);box-shadow:0 0 12px rgba(20,160,166,.85);flex:0 0 auto;}
.brand-name{font-size:17px;letter-spacing:.01em;white-space:nowrap;}
@media(min-width:768px){.brand-name{font-size:18px;}}
.nav-desktop{display:none;align-items:center;gap:32px;}
@media(min-width:768px){.nav-desktop{display:flex;}}
.nav-link{position:relative;font-size:15px;font-weight:500;color:var(--text-2);padding:6px 0;}
.nav-link:hover{color:var(--text);}
.nav-link.is-active{color:var(--text);font-weight:600;}
.nav-link.is-active::after{content:"";position:absolute;left:0;right:0;bottom:-4px;height:2px;border-radius:2px;background:var(--primary);}
.nav-actions{display:flex;align-items:center;gap:12px;}
@media(max-width:767px){.nav-actions .btn-ghost{display:none;}}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 24px;border-radius:999px;border:1px solid transparent;
  font-size:15px;font-weight:600;line-height:1;cursor:pointer;white-space:nowrap;
  transition:background-color .2s ease,border-color .2s ease,color .2s ease,box-shadow .2s ease,transform .15s ease;
}
.btn-sm{height:40px;padding:0 18px;font-size:14px;}
.btn-primary{background:var(--accent);color:#0B1119;box-shadow:0 8px 24px rgba(255,107,53,.32);}
.btn-primary:hover{background:var(--accent-light);box-shadow:0 10px 30px rgba(255,107,53,.45);transform:translateY(-1px);}
.btn-primary:active{transform:translateY(1px);}
.btn-ghost{background:transparent;color:var(--text-2);border-color:rgba(255,255,255,.18);}
.btn-ghost:hover{color:var(--text);border-color:var(--primary);background:rgba(255,255,255,.06);}
.btn-block{width:100%;}

/* ---------- hamburger & drawer ---------- */
.hamburger{display:flex;flex-direction:column;justify-content:center;gap:5px;width:40px;height:40px;background:transparent;border:0;padding:0;cursor:pointer;}
.hamburger span{display:block;width:20px;height:2px;background:var(--text);border-radius:2px;transition:transform .2s ease,opacity .2s ease;}
.hamburger.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.hamburger.is-open span:nth-child(2){opacity:0;}
.hamburger.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}
@media(min-width:768px){.hamburger{display:none;}}
.mobile-drawer{
  position:fixed;inset:0;z-index:70;
  background:rgba(7,11,18,.98);
  padding:92px 24px 40px;
  display:flex;flex-direction:column;
  opacity:0;visibility:hidden;transition:opacity .2s ease,visibility .2s ease;
}
.mobile-drawer.is-open{opacity:1;visibility:visible;}
.mobile-drawer .nav-link{font-size:18px;padding:14px 0 14px 16px;border-left:3px solid transparent;color:var(--text-2);}
.mobile-drawer .nav-link.is-active{border-left-color:var(--primary);color:var(--text);font-weight:600;}
.mobile-drawer .nav-link.is-active::after{display:none;}
@media(min-width:768px){.mobile-drawer{display:none;}}

/* ---------- page hero ---------- */
.page-hero{
  position:relative;
  padding:104px 0 56px;
  background-image:linear-gradient(rgba(7,11,18,.74),rgba(7,11,18,.93)),url(/assets/images/backpic/back-1.png);
  background-size:cover;background-position:center;
  border-bottom:1px solid var(--line);
}
.breadcrumb{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--text-3);letter-spacing:.04em;}
.breadcrumb a:hover{color:var(--primary);}
.breadcrumb .sep{color:var(--text-3);}
.breadcrumb .current{color:var(--text-2);}
.page-hero h1{
  margin:22px 0 0;
  font-size:clamp(30px,5.2vw,54px);
  font-weight:800;line-height:1.12;letter-spacing:-.02em;
  max-width:15em;
}
.page-hero-lead{margin:16px 0 0;font-size:17px;color:var(--text-2);max-width:34em;}
.page-hero-rule{margin-top:30px;height:1px;background:var(--line);}

/* ---------- sections ---------- */
.section{padding:72px 0;}
@media(min-width:1024px){.section{padding:112px 0;}}
.section-soft{background:var(--bg-soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.sec-head{max-width:760px;margin-bottom:36px;}
.sec-eyebrow{display:inline-block;font-size:12px;font-weight:600;letter-spacing:.16em;color:var(--primary);}
.sec-title{margin:12px 0 0;font-size:clamp(24px,3.4vw,38px);font-weight:700;line-height:1.25;}
.sec-desc{margin:14px 0 0;color:var(--text-2);font-size:15px;max-width:62ch;}

/* ---------- grid & cards ---------- */
.grid-2{display:grid;gap:24px;grid-template-columns:1fr;}
@media(min-width:640px){.grid-2{grid-template-columns:repeat(2,1fr);}}
.card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius-m);
  padding:28px;
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  box-shadow:var(--shadow);
  transition:transform .25s ease,border-color .25s ease,box-shadow .25s ease;
}
.card:hover{transform:translateY(-4px);border-color:rgba(20,160,166,.32);box-shadow:var(--shadow-hover);}
.card-icon{
  width:44px;height:44px;border-radius:12px;display:grid;place-items:center;
  background:rgba(20,160,166,.14);color:var(--primary-dim);
  font-size:17px;font-weight:700;font-variant-numeric:tabular-nums;
}
.card-title{margin:18px 0 0;font-size:20px;font-weight:600;line-height:1.4;}
.card-text{margin:10px 0 0;color:var(--text-2);font-size:15px;line-height:1.75;}
.card-link{display:inline-flex;align-items:center;gap:6px;margin-top:18px;font-size:14px;color:var(--text-3);}
.card-link:hover{color:var(--primary);}
.card-link .arrow{transition:transform .2s ease;}
.card-link:hover .arrow{transform:translateX(3px);}

/* ---------- split media ---------- */
.split{display:grid;gap:32px;align-items:center;}
@media(min-width:1024px){.split{grid-template-columns:1fr 1fr;gap:56px;}}
.split-media{border-radius:var(--radius-l);overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow);}
.split-media img{width:100%;aspect-ratio:3/2;object-fit:cover;}
@media(min-width:1024px){.split.reverse .split-media{order:2;}}
.bullet-list{list-style:none;margin:24px 0 0;padding:0;display:grid;gap:16px;}
.bullet-item{display:flex;gap:14px;align-items:flex-start;}
.bullet-mark{
  flex:0 0 auto;width:22px;height:22px;margin-top:3px;border-radius:50%;
  background:rgba(20,160,166,.16);color:var(--primary-dim);
  display:grid;place-items:center;font-size:12px;font-weight:700;
}
.bullet-item strong{display:block;font-size:16px;font-weight:600;}
.bullet-item span.plain{color:var(--text-2);font-size:15px;}

/* ---------- rail ---------- */
.rail{display:flex;gap:20px;overflow-x:auto;padding:4px 4px 20px;scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch;}
.rail::-webkit-scrollbar{height:6px;}
.rail::-webkit-scrollbar-thumb{background:rgba(255,255,255,.14);border-radius:999px;}
.rail-card{
  flex:0 0 280px;scroll-snap-align:start;
  background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius-m);
  padding:24px;transition:transform .25s ease,border-color .25s ease;
}
.rail-card:hover{transform:translateY(-4px);border-color:rgba(20,160,166,.4);}
@media(min-width:640px){.rail-card{flex:0 0 320px;}}
.rail-card h3{margin:16px 0 0;font-size:18px;font-weight:600;line-height:1.4;}
.rail-card p{margin:10px 0 0;color:var(--text-2);font-size:14px;line-height:1.75;}
.rail-meta{margin-top:18px;padding-top:14px;border-top:1px solid var(--line);font-size:12px;color:var(--text-3);letter-spacing:.04em;font-variant-numeric:tabular-nums;}
.badge{display:inline-flex;align-items:center;height:24px;padding:0 12px;border-radius:999px;font-size:12px;font-weight:600;letter-spacing:.04em;}
.badge-primary{background:rgba(20,160,166,.14);color:var(--primary-dim);}
.badge-amber{background:rgba(255,194,75,.14);color:var(--amber);}

/* ---------- timeline / steps ---------- */
.step-grid{display:grid;gap:24px;}
@media(min-width:768px){.step-grid{grid-template-columns:repeat(3,1fr);}}
.step{
  position:relative;padding:30px 24px;background:var(--bg-soft);
  border:1px solid var(--line);border-radius:var(--radius-m);
  transition:border-color .25s ease,transform .25s ease;
}
.step:hover{border-color:rgba(20,160,166,.36);transform:translateY(-4px);}
.step-num{font-size:34px;font-weight:800;line-height:1;color:rgba(20,160,166,.42);font-variant-numeric:tabular-nums;letter-spacing:.02em;}
.step h3{margin:16px 0 0;font-size:19px;font-weight:600;line-height:1.4;}
.step p{margin:10px 0 0;color:var(--text-2);font-size:14px;line-height:1.8;}

/* ---------- check list ---------- */
.check-grid{display:grid;gap:18px;}
@media(min-width:640px){.check-grid{grid-template-columns:repeat(2,1fr);}}
.check-item{
  display:flex;gap:14px;align-items:flex-start;
  padding:22px;border:1px solid var(--line);border-radius:var(--radius-m);
  background:rgba(255,255,255,.02);
  transition:border-color .25s ease,background-color .25s ease;
}
.check-item:hover{border-color:rgba(20,160,166,.3);background:rgba(255,255,255,.04);}
.check-mark{
  flex:0 0 auto;width:24px;height:24px;border-radius:50%;margin-top:2px;
  background:rgba(20,160,166,.16);color:var(--primary-dim);
  display:grid;place-items:center;font-size:12px;font-weight:700;
}
.check-item h3{margin:0;font-size:16px;font-weight:600;line-height:1.5;}
.check-item p{margin:8px 0 0;color:var(--text-2);font-size:14px;line-height:1.75;}

/* ---------- FAQ ---------- */
.faq-list{border-top:1px solid var(--line);}
.faq-item{border-bottom:1px solid var(--line);}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:24px 0;background:none;border:0;cursor:pointer;text-align:left;
  color:var(--text);font-size:17px;font-weight:600;line-height:1.5;
  transition:color .2s ease;
}
.faq-q:hover{color:var(--primary-dim);}
.faq-mark{position:relative;flex:0 0 auto;width:14px;height:14px;}
.faq-mark::before,.faq-mark::after{content:"";position:absolute;background:var(--primary);border-radius:2px;}
.faq-mark::before{left:0;top:6px;width:14px;height:2px;}
.faq-mark::after{left:6px;top:0;width:2px;height:14px;transition:transform .2s ease,opacity .2s ease;}
.faq-item.is-open .faq-mark::after{transform:rotate(90deg);opacity:0;}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease;}
.faq-a p{margin:0 0 24px;padding-right:36px;color:var(--text-2);font-size:15px;line-height:1.85;}

/* ---------- CTA band ---------- */
.cta-band{background:var(--bg-deep);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.cta-inner{display:flex;flex-direction:column;gap:24px;align-items:flex-start;padding:64px 0;}
@media(min-width:768px){.cta-inner{flex-direction:row;align-items:center;justify-content:space-between;padding:72px 0;}}
.cta-inner h2{margin:0;font-size:clamp(22px,2.6vw,30px);font-weight:700;line-height:1.3;max-width:22em;}
.cta-inner p{margin:12px 0 0;color:var(--text-2);font-size:15px;max-width:38em;}

/* ---------- footer ---------- */
.site-footer{background:var(--bg-deep);border-top:1px solid var(--line);padding-top:64px;}
.footer-grid{display:grid;gap:36px;grid-template-columns:1fr;padding-bottom:48px;}
@media(min-width:768px){.footer-grid{grid-template-columns:repeat(2,1fr);}}
@media(min-width:1024px){.footer-grid{grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px;}}
.footer-brand{display:inline-flex;align-items:center;gap:10px;font-size:17px;font-weight:700;}
.footer-desc{margin:16px 0 0;color:var(--text-3);font-size:14px;line-height:1.8;max-width:34ch;}
.footer-title{margin:0 0 16px;font-size:13px;font-weight:600;letter-spacing:.12em;color:var(--text-3);}
.footer-links{display:flex;flex-direction:column;gap:12px;}
.footer-links a,.footer-links span{font-size:14px;color:var(--text-2);}
.footer-links a:hover{color:var(--primary);}
.footer-bottom{
  display:flex;flex-direction:column;gap:10px;
  padding:22px 0;border-top:1px solid var(--line);
  font-size:13px;color:var(--text-3);
}
@media(min-width:768px){.footer-bottom{flex-direction:row;align-items:center;justify-content:space-between;}}

/* ---------- floating CTA ---------- */
.float-cta{
  position:fixed;right:32px;bottom:32px;z-index:60;
  opacity:0;transform:translateY(12px);pointer-events:none;
  transition:opacity .3s ease,transform .3s ease;
}
@media(min-width:1024px){.float-cta{display:block;}}
@media(max-width:1023px){.float-cta{display:none;}}
.float-cta.is-visible{opacity:1;transform:translateY(0);pointer-events:auto;}
.mobile-bar{
  position:fixed;left:0;right:0;bottom:0;z-index:60;
  display:flex;gap:12px;align-items:center;
  padding:12px 20px calc(12px + env(safe-area-inset-bottom));
  background:rgba(7,11,18,.94);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border-top:1px solid var(--line);
  transform:translateY(110%);transition:transform .3s ease;
}
@media(min-width:1024px){.mobile-bar{display:none;}}
.mobile-bar.is-visible{transform:translateY(0);}
.mobile-bar .btn{flex:1;}
.mobile-bar .btn-top{flex:0 0 auto;width:48px;padding:0;}
@media(max-width:1023px){body{padding-bottom:84px;}}

/* roulang page: category2 */
:root{
  --bg-deep:#070B12;
  --bg-base:#0B1119;
  --bg-panel:#111A25;
  --teal:#14A0A6;
  --teal-deep:#0C5B66;
  --orange:#FF6B35;
  --orange-light:#FF8A5C;
  --amber:#FFC24B;
  --text:#F2F6FA;
  --text-2:rgba(226,236,245,.68);
  --text-3:rgba(226,236,245,.42);
  --line:rgba(255,255,255,.08);
  --line-strong:rgba(255,255,255,.18);
  --r-sm:8px;
  --r-md:16px;
  --r-lg:20px;
  --r-pill:999px;
  --shadow-card:0 8px 30px rgba(0,0,0,.35);
  --shadow-hover:0 16px 44px rgba(0,0,0,.45);
  --glow:0 8px 24px rgba(255,107,53,.32);
  --sec:72px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg-base);
  color:var(--text);
  font-family:system-ui,-apple-system,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block;border:0}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer;border:0;background:none;color:inherit}
h1,h2,h3,h4,p,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
input,textarea{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--orange);outline-offset:2px}
.wrap{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
@media(min-width:768px){.wrap{padding:0 32px}}
@media(min-width:1280px){.wrap{padding:0 40px}}
.section{padding:var(--sec) 0;scroll-margin-top:88px}
@media(min-width:1024px){.section{padding:112px 0}}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12px;letter-spacing:.14em;color:var(--teal);
  text-transform:uppercase;font-weight:600;
}
.eyebrow::before{content:"";width:18px;height:1px;background:var(--teal);display:block}
h1{font-size:clamp(30px,5.2vw,54px);font-weight:800;line-height:1.12;letter-spacing:-.02em}
h2{font-size:clamp(24px,3.4vw,38px);font-weight:700;line-height:1.25;letter-spacing:-.01em}
h3{font-size:21px;font-weight:600;line-height:1.4}
.lead{font-size:17px;color:var(--text-2);line-height:1.8}
.muted{color:var(--text-2)}
.faint{color:var(--text-3);font-size:13px}
.sec-head{max-width:760px;margin-bottom:32px}
.sec-head h2{margin:14px 0 12px}
.divider{height:1px;background:var(--line);border:0;margin:0}

/* ============ 按钮体系 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 24px;border-radius:var(--r-pill);
  font-size:15px;font-weight:600;letter-spacing:.01em;
  transition:transform .18s ease,background .18s ease,box-shadow .18s ease,border-color .18s ease,color .18s ease;
  white-space:nowrap;
}
.btn-primary{background:var(--orange);color:#0B1119;box-shadow:var(--glow)}
.btn-primary:hover{background:var(--orange-light);box-shadow:0 10px 28px rgba(255,107,53,.42);transform:translateY(-1px)}
.btn-primary:active{transform:translateY(1px)}
.btn-ghost{background:transparent;border:1px solid var(--line-strong);color:var(--text)}
.btn-ghost:hover{border-color:var(--teal);background:rgba(255,255,255,.06);transform:translateY(-1px)}
.btn-ghost:active{transform:translateY(1px)}
.btn-sm{height:40px;padding:0 18px;font-size:14px}
.btn-block{width:100%}
.link-more{
  display:inline-flex;align-items:center;gap:6px;
  color:var(--text-2);font-size:15px;font-weight:500;
  border-bottom:1px solid transparent;padding-bottom:2px;
  transition:color .18s,border-color .18s;
}
.link-more:hover{color:var(--teal);border-bottom-color:var(--teal)}
.badge{
  display:inline-flex;align-items:center;gap:6px;
  height:26px;padding:0 12px;border-radius:var(--r-pill);
  font-size:12px;font-weight:600;letter-spacing:.06em;
  background:rgba(255,194,75,.12);color:var(--amber);
}
.badge-teal{background:rgba(20,160,166,.14);color:var(--teal)}

/* ============ 导航 ============ */
.site-header{
  position:sticky;top:0;z-index:60;
  background:transparent;border-bottom:1px solid transparent;
  transition:background .3s ease,border-color .3s ease,backdrop-filter .3s ease;
}
.site-header.is-scrolled{
  background:rgba(11,17,25,.72);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom-color:var(--line);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;height:72px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700}
.brand-dot{
  width:8px;height:8px;border-radius:2px;background:var(--teal);
  transform:rotate(45deg);box-shadow:0 0 12px rgba(20,160,166,.85);flex:0 0 auto;
}
.brand-name{font-size:17px;letter-spacing:.01em;white-space:nowrap}
.nav-desktop{display:flex;align-items:center;gap:32px}
.nav-link{position:relative;padding:6px 0;font-size:15px;font-weight:500;color:var(--text-2);transition:color .2s}
.nav-link:hover{color:var(--text)}
.nav-link.is-active{color:var(--text)}
.nav-link.is-active::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  border-radius:2px;background:var(--teal);
}
.nav-actions{display:flex;align-items:center;gap:12px}
.hamburger{
  display:none;width:42px;height:42px;border-radius:var(--r-sm);
  border:1px solid var(--line-strong);flex-direction:column;
  align-items:center;justify-content:center;gap:5px;transition:border-color .2s;
}
.hamburger:hover{border-color:var(--teal)}
.hamburger span{display:block;width:18px;height:1.6px;background:var(--text);border-radius:2px;transition:transform .2s,opacity .2s}
@media(max-width:1023px){
  .nav-desktop{display:none}
  .hamburger{display:flex}
  .nav-actions .btn-ghost{display:none}
}
@media(max-width:640px){
  .header-inner{height:60px}
  .brand-name{font-size:15px}
  .nav-actions .btn-primary{display:none}
}

/* 移动抽屉 */
.drawer-mask{
  position:fixed;inset:0;background:rgba(7,11,18,.7);backdrop-filter:blur(2px);
  opacity:0;visibility:hidden;transition:opacity .2s ease,visibility .2s ease;z-index:70;
}
.drawer-mask.is-open{opacity:1;visibility:visible}
.drawer{
  position:fixed;top:0;right:0;bottom:0;width:min(86vw,360px);
  background:var(--bg-panel);border-left:1px solid var(--line);
  transform:translateX(100%);transition:transform .24s ease;z-index:80;
  padding:88px 24px 32px;display:flex;flex-direction:column;gap:6px;
}
.drawer.is-open{transform:translateX(0)}
.drawer-link{
  display:flex;align-items:center;gap:10px;
  padding:14px 12px;border-radius:var(--r-sm);font-size:16px;color:var(--text-2);
  transition:background .2s,color .2s;
}
.drawer-link::before{content:"";width:3px;height:16px;border-radius:2px;background:transparent}
.drawer-link:hover{background:rgba(255,255,255,.05);color:var(--text)}
.drawer-link.is-active{color:var(--text);background:rgba(20,160,166,.1)}
.drawer-link.is-active::before{background:var(--teal)}

/* ============ 页面横幅 ============ */
.page-hero{
  position:relative;overflow:hidden;
  min-height:360px;display:flex;align-items:flex-end;
  background-image:linear-gradient(160deg,rgba(7,11,18,.62),rgba(7,11,18,.94)),url('/assets/images/backpic/back-2.webp');
  background-size:cover;background-position:center;
  border-bottom:1px solid var(--line);
}
.page-hero::after{
  content:"";position:absolute;right:-140px;top:-120px;width:520px;height:520px;
  background:radial-gradient(circle,rgba(20,160,166,.20),transparent 66%);
  pointer-events:none;
}
.page-hero .wrap{position:relative;z-index:2;padding-top:120px;padding-bottom:48px}
.crumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:12px;letter-spacing:.06em;color:var(--text-3);margin-bottom:20px}
.crumb a{color:var(--text-3);transition:color .2s}
.crumb a:hover{color:var(--teal)}
.crumb span.sep::before{content:"·";margin-right:8px}
.crumb .current{color:var(--text)}
.page-hero h1{margin-bottom:16px}
.page-hero .lead{max-width:640px}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
.tag{
  display:inline-flex;align-items:center;height:30px;padding:0 14px;
  border-radius:var(--r-pill);border:1px solid var(--line);
  background:rgba(255,255,255,.04);font-size:13px;color:var(--text-2);
}

/* ============ 步骤时间轴 ============ */
.steps{position:relative;margin-top:8px}
.steps::before{
  content:"";position:absolute;left:27px;top:16px;bottom:16px;width:1px;
  background:linear-gradient(to bottom,rgba(20,160,166,.6),rgba(255,255,255,.06));
}
.step{position:relative;display:grid;grid-template-columns:56px 1fr;gap:24px;padding:24px 0}
.step-no{
  width:56px;height:56px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  background:var(--bg-panel);border:1px solid var(--line);
  font-size:15px;font-weight:700;color:var(--teal);font-variant-numeric:tabular-nums;
  letter-spacing:.06em;
}
.step:hover .step-no{border-color:rgba(20,160,166,.6);box-shadow:0 0 0 4px rgba(20,160,166,.08)}
.step-body h3{margin-bottom:8px}
.step-body p{color:var(--text-2);font-size:15.5px;max-width:720px}
.step-meta{margin-top:12px;font-size:13px;color:var(--text-3);letter-spacing:.06em}
@media(max-width:640px){
  .step{grid-template-columns:44px 1fr;gap:16px}
  .step-no{width:44px;height:44px;font-size:13px}
  .steps::before{left:21px}
}

/* ============ 卡片与网格 ============ */
.card{
  background:var(--bg-panel);border:1px solid var(--line);border-radius:var(--r-md);
  padding:26px;box-shadow:var(--shadow-card);
  transition:transform .22s ease,border-color .22s ease,box-shadow .22s ease;
}
.card:hover{transform:translateY(-4px);border-color:rgba(20,160,166,.35);box-shadow:var(--shadow-hover)}
.card h3{margin-bottom:10px}
.card p{color:var(--text-2);font-size:15px}
.card-icon{
  width:40px;height:40px;border-radius:var(--r-sm);
  display:flex;align-items:center;justify-content:center;
  background:rgba(20,160,166,.14);color:var(--teal);font-size:18px;font-weight:700;
  margin-bottom:16px;font-variant-numeric:tabular-nums;
}
.grid-2{display:grid;grid-template-columns:1fr;gap:20px}
.grid-3{display:grid;grid-template-columns:1fr;gap:20px}
@media(min-width:640px){.grid-2,.grid-3{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.grid-3{grid-template-columns:repeat(3,1fr)}}
.list-check{margin-top:16px;display:flex;flex-direction:column;gap:10px}
.list-check li{position:relative;padding-left:20px;font-size:15px;color:var(--text-2)}
.list-check li::before{
  content:"";position:absolute;left:0;top:9px;width:6px;height:6px;
  border-radius:50%;background:var(--teal);
}

/* ============ 图文左右交替 ============ */
.split{display:grid;grid-template-columns:1fr;gap:32px;align-items:center}
@media(min-width:1024px){
  .split{grid-template-columns:1.05fr .95fr;gap:56px}
  .split.reverse .split-media{order:2}
}
.split-media img{
  width:100%;aspect-ratio:3/2;object-fit:cover;border-radius:var(--r-lg);
  border:1px solid var(--line);box-shadow:var(--shadow-card);
}
.split-cap{margin-top:12px;font-size:13px;color:var(--text-3);text-align:center}
.split-text h2{margin-bottom:16px}
.split-text p{color:var(--text-2);margin-bottom:14px}
.split + .split{margin-top:64px}

/* ============ 横向滚动卡带 ============ */
.hscroll{
  display:flex;gap:20px;overflow-x:auto;padding:6px 4px 20px;
  scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch;
}
.hscroll::-webkit-scrollbar{height:6px}
.hscroll::-webkit-scrollbar-track{background:rgba(255,255,255,.04);border-radius:99px}
.hscroll::-webkit-scrollbar-thumb{background:rgba(20,160,166,.5);border-radius:99px}
.hcard{
  flex:0 0 300px;scroll-snap-align:start;
  background:var(--bg-panel);border:1px solid var(--line);border-radius:var(--r-md);
  padding:24px;box-shadow:var(--shadow-card);
  transition:transform .22s ease,border-color .22s ease;
}
.hcard:hover{transform:translateY(-4px);border-color:rgba(20,160,166,.35)}
.hcard .idx{font-size:12px;letter-spacing:.16em;color:var(--amber);font-variant-numeric:tabular-nums}
.hcard h3{font-size:18px;margin:12px 0 10px}
.hcard p{font-size:14.5px;color:var(--text-2)}
@media(min-width:1024px){.hcard{flex:0 0 340px}}

/* ============ 数据条 ============ */
.stats{
  display:grid;grid-template-columns:repeat(2,1fr);gap:1px;
  background:var(--line);border:1px solid var(--line);border-radius:var(--r-md);overflow:hidden;
}
.stats > div{background:var(--bg-panel);padding:22px 20px}
.stat-num{font-size:clamp(24px,3vw,32px);font-weight:800;color:var(--amber);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.stat-label{font-size:13px;color:var(--text-3);margin-top:6px;letter-spacing:.04em}
@media(min-width:768px){.stats{grid-template-columns:repeat(4,1fr)}}

/* ============ FAQ ============ */
.faq-list{margin-top:8px;border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item summary{
  list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;
  gap:20px;padding:22px 0;font-size:17px;font-weight:600;transition:color .2s;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary:hover{color:var(--teal)}
.faq-plus{
  flex:0 0 auto;width:22px;height:22px;position:relative;
  transition:transform .2s ease;
}
.faq-plus::before,.faq-plus::after{
  content:"";position:absolute;left:50%;top:50%;background:var(--teal);
  transform:translate(-50%,-50%);border-radius:2px;
}
.faq-plus::before{width:14px;height:1.6px}
.faq-plus::after{width:1.6px;height:14px}
.faq-item[open] .faq-plus{transform:rotate(45deg)}
.faq-answer{padding:0 40px 24px 0;font-size:15px;line-height:1.8;color:var(--text-2)}
@media(max-width:640px){.faq-answer{padding-right:16px}}

/* ============ CTA 窄带 ============ */
.cta-band{
  background:var(--bg-deep);border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  padding:56px 0;
}
.cta-inner{display:flex;flex-direction:column;gap:22px;align-items:flex-start}
.cta-inner h2{font-size:clamp(22px,2.8vw,30px)}
.cta-inner p{color:var(--text-2);max-width:560px}
@media(min-width:900px){
  .cta-inner{flex-direction:row;align-items:center;justify-content:space-between;gap:40px}
  .cta-inner p{margin-top:10px}
}

/* ============ 页脚 ============ */
.site-footer{background:var(--bg-deep);border-top:1px solid var(--line);padding:64px 0 28px}
.footer-grid{display:grid;grid-template-columns:1fr;gap:36px}
@media(min-width:768px){.footer-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px}}
.footer-brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:16px}
.footer-desc{margin-top:14px;font-size:14px;color:var(--text-2);max-width:320px}
.footer-title{font-size:13px;letter-spacing:.14em;color:var(--text-3);text-transform:uppercase;margin-bottom:16px}
.footer-links{display:flex;flex-direction:column;gap:12px}
.footer-links a,.footer-links span{font-size:14.5px;color:var(--text-2);transition:color .2s}
.footer-links a:hover{color:var(--teal)}
.footer-bottom{
  margin-top:48px;padding-top:22px;border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;
  font-size:13px;color:var(--text-3);
}

/* ============ 浮动 CTA ============ */
.float-cta{
  position:fixed;right:28px;bottom:28px;z-index:50;
  display:flex;align-items:center;gap:10px;
  padding:8px;border-radius:var(--r-pill);
  background:rgba(17,26,37,.82);border:1px solid var(--line);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  box-shadow:var(--shadow-card);
  opacity:0;visibility:hidden;transform:translateY(14px);
  transition:opacity .28s ease,transform .28s ease,visibility .28s ease;
}
.float-cta.is-visible{opacity:1;visibility:visible;transform:translateY(0)}
.to-top{
  width:40px;height:40px;border-radius:50%;border:1px solid var(--line-strong);
  display:flex;align-items:center;justify-content:center;color:var(--text-2);
  transition:border-color .2s,color .2s;
}
.to-top:hover{border-color:var(--teal);color:var(--teal)}
@media(max-width:640px){
  .float-cta{
    right:0;left:0;bottom:0;border-radius:0;border-left:0;border-right:0;border-bottom:0;
    padding:10px 16px calc(10px + env(safe-area-inset-bottom));
    justify-content:space-between;gap:12px;
  }
  .float-cta .btn{flex:1}
}