/* roulang page: index */
:root{
  --bg:#060A14;
  --bg-2:#0B1220;
  --panel:#0A1424;
  --panel-2:#080E1A;
  --line:rgba(255,255,255,.08);
  --line-2:rgba(255,255,255,.07);
  --glass:linear-gradient(160deg, rgba(255,255,255,.07), rgba(255,255,255,.02));
  --primary:#1FE0C0;
  --primary-deep:#12A98F;
  --coral:#FF5C46;
  --text:#E8EEF7;
  --text-2:#A9B6C9;
  --text-3:#6E7C90;
  --radius-lg:20px;
  --radius:16px;
  --radius-sm:12px;
  --radius-xs:10px;
  --shadow:0 18px 40px rgba(0,0,0,.45);
  --shadow-hover:0 26px 56px rgba(0,0,0,.55);
  --font:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--text-2);
  font-family:var(--font);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body.nav-open{overflow:hidden}
img{max-width:100%;display:block;height:auto;border-style:none}
a{color:inherit;text-decoration:none;transition:color .2s ease-out,background-color .2s ease-out,border-color .2s ease-out,opacity .2s ease-out}
button{font:inherit;cursor:pointer;border:0;background:none}
ul,ol{list-style:none;margin:0;padding:0}
h1,h2,h3,h4{margin:0;color:var(--text);font-weight:700;letter-spacing:.01em}
h1{font-size:clamp(30px,4.6vw,48px);line-height:1.2}
h2{font-size:clamp(24px,3.2vw,34px);line-height:1.3}
h3{font-size:20px;line-height:1.4;font-weight:600}
h4{font-size:17px;line-height:1.5;font-weight:600}
p{margin:0 0 1.2em}
p:last-child{margin-bottom:0}
::selection{background:rgba(31,224,192,.32);color:#fff}
.grid-container{max-width:1200px;padding-left:32px;padding-right:32px}
@media screen and (max-width:639px){
  .grid-container{padding-left:20px;padding-right:20px}
}
/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(6,10,20,.74);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid var(--line-2);
  transition:background-color .24s ease-out;
}
.site-header.is-scrolled{background:rgba(6,10,20,.95)}
.nav-wrap{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:16px;
  height:72px;
  transition:height .24s ease-out;
}
.site-header.is-scrolled .nav-wrap{height:60px}
.nav-left,.nav-right{display:flex;align-items:center;gap:4px}
.nav-right{justify-content:flex-end}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:0 13px;
  font-size:14.5px;
  color:var(--text-2);
  border-radius:var(--radius-xs);
  white-space:nowrap;
}
.nav-link:hover{color:var(--primary);background:rgba(31,224,192,.09)}
.nav-link:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
.nav-link.is-active{color:var(--primary)}
.nav-link.is-active::after{
  content:"";position:absolute;left:13px;right:13px;bottom:4px;height:2px;
  background:var(--primary);border-radius:2px;
}
.brand{
  display:flex;flex-direction:column;align-items:center;
  padding:6px 12px;border-radius:14px;line-height:1.15;
  transition:background-color .2s ease-out;
}
.brand:hover{background:rgba(255,255,255,.04)}
.brand:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
.brand-text{
  font-size:16.5px;font-weight:700;color:var(--text);letter-spacing:.02em;
  white-space:nowrap;
}
.brand-text em{font-style:normal;color:var(--primary)}
.brand-sub{
  margin-top:3px;font-size:11px;letter-spacing:.2em;color:var(--text-3);
}
.brand:hover .brand-text{color:var(--primary)}
.nav-cta{margin-left:8px}
.nav-toggle{
  display:none;width:44px;height:44px;border-radius:var(--radius-sm);
  border:1px solid var(--line);align-items:center;justify-content:center;
  flex-direction:column;gap:5px;background:var(--glass);
}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--text);border-radius:2px;transition:transform .22s ease-out,opacity .22s ease-out}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.nav-toggle:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
.mobile-nav{
  display:none;
  border-top:1px solid var(--line-2);
  background:rgba(7,12,22,.98);
  padding:16px 20px 26px;
}
.mobile-nav.is-open{display:block;animation:fadeDown .24s ease-out}
@keyframes fadeDown{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}
.mnav-link{
  display:flex;align-items:center;justify-content:space-between;
  min-height:48px;padding:0 14px;font-size:15px;color:var(--text-2);
  border-radius:var(--radius-xs);border:1px solid transparent;
}
.mnav-link:hover,.mnav-link:focus-visible{background:rgba(31,224,192,.1);color:var(--primary);border-color:rgba(31,224,192,.24);outline:none}
.mnav-link.is-active{color:var(--primary)}
.mnav-link i{font-size:12px;color:var(--text-3)}
.mobile-nav .btn{margin-top:14px;width:100%}
/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:0 22px;border-radius:var(--radius-sm);
  font-size:15px;font-weight:600;border:1px solid transparent;
  cursor:pointer;white-space:nowrap;
  transition:transform .22s ease-out,box-shadow .22s ease-out,background-color .22s ease-out,color .22s ease-out,filter .22s ease-out;
}
.btn-primary{
  background:var(--primary);color:#04121A;
  box-shadow:0 0 0 1px rgba(31,224,192,.5),0 10px 30px rgba(31,224,192,.28);
}
.btn-primary:hover{filter:brightness(1.08);transform:translateY(-2px);color:#04121A;box-shadow:0 0 0 1px rgba(31,224,192,.6),0 16px 40px rgba(31,224,192,.36)}
.btn-primary:active{transform:translateY(-1px)}
.btn-ghost{background:var(--glass);border-color:rgba(31,224,192,.4);color:var(--text)}
.btn-ghost:hover{background:rgba(31,224,192,.12);color:var(--primary);transform:translateY(-2px)}
.btn-ghost:active{transform:translateY(-1px)}
.btn-coral{background:var(--coral);color:#1A0703;box-shadow:0 10px 26px rgba(255,92,70,.26)}
.btn-coral:hover{filter:brightness(1.06);transform:translateY(-2px);color:#1A0703}
.btn-sm{min-height:38px;padding:0 16px;font-size:14px}
.btn-block{width:100%}
.btn:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
.btn-icon{
  width:44px;height:44px;padding:0;border-radius:var(--radius-sm);
  border:1px solid var(--line);background:var(--glass);color:var(--text-2);
  display:inline-flex;align-items:center;justify-content:center;
}
.btn-icon:hover{color:var(--primary);border-color:rgba(31,224,192,.45);background:rgba(31,224,192,.1)}
.btn-icon:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
/* ---------- badges ---------- */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;border-radius:999px;
  font-size:12px;line-height:1.5;letter-spacing:.02em;
  white-space:nowrap;
}
.badge-soft{background:rgba(31,224,192,.12);color:var(--primary);border:1px solid rgba(31,224,192,.3)}
.badge-line{background:transparent;border:1px solid rgba(31,224,192,.35);color:var(--primary)}
.badge-coral{background:var(--coral);color:#1A0703}
.badge-mute{background:rgba(255,255,255,.06);color:var(--text-3);border:1px solid var(--line)}
/* ---------- hero ---------- */
.hero{position:relative;padding:76px 0 92px;overflow:hidden;background:var(--bg)}
.hero::before{
  content:"";position:absolute;inset:0;
  background:url("/assets/images/backpic/back-1.webp") center/cover no-repeat;
  opacity:.16;
}
.hero::after{
  content:"";position:absolute;inset:0;
  background:
    radial-gradient(620px 340px at 12% 8%, rgba(31,224,192,.15), transparent 70%),
    radial-gradient(540px 320px at 88% 92%, rgba(255,92,70,.10), transparent 70%),
    linear-gradient(180deg, rgba(6,10,20,.72), rgba(6,10,20,.94) 68%, var(--bg));
}
.hero .grid-lines{
  position:absolute;inset:0;z-index:1;pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
                   linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size:32px 32px;
  mask-image:linear-gradient(180deg, rgba(0,0,0,.9), transparent 85%);
  -webkit-mask-image:linear-gradient(180deg, rgba(0,0,0,.9), transparent 85%);
}
.hero .grid-container{position:relative;z-index:2}
.hero-grid{padding-top:8px}
.hero-copy .badge{margin-bottom:20px}
.hero-copy h1{margin-bottom:18px;max-width:16em}
.hero-sub{
  font-size:17px;line-height:1.8;color:var(--text-2);
  max-width:34em;margin-bottom:28px;
}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:34px}
.hero-points{display:flex;flex-wrap:wrap;gap:12px 26px}
.hero-points li{display:inline-flex;align-items:center;gap:8px;font-size:14px;color:var(--text-2)}
.hero-points i{color:var(--primary);font-size:13px}
.hero-visual{padding-top:12px}
.hero-figure{
  position:relative;margin:0;border-radius:var(--radius-lg);overflow:hidden;
  border:1px solid var(--line);box-shadow:var(--shadow);
}
.hero-figure img{width:100%;aspect-ratio:16/10;object-fit:cover}
.hero-figure::after{
  content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background:linear-gradient(200deg, rgba(31,224,192,.26), transparent 55%),
             linear-gradient(0deg, rgba(6,10,20,.62), transparent 58%);
}
.hero-float-card{
  position:absolute;right:16px;bottom:16px;z-index:3;
  display:flex;align-items:center;gap:12px;
  padding:12px 16px;border-radius:14px;
  background:linear-gradient(160deg, rgba(255,255,255,.12), rgba(255,255,255,.04));
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border:1px solid rgba(255,255,255,.14);
}
.hero-float-card strong{display:block;font-size:13px;color:var(--text)}
.hero-float-card span{display:block;font-size:15px;font-weight:700;color:var(--primary)}
.hero-float-card .dot{
  width:10px;height:10px;border-radius:50%;background:var(--primary);
  box-shadow:0 0 0 4px rgba(31,224,192,.18);
}
/* ---------- sections ---------- */
.section{position:relative;padding:96px 0}
.section-alt{background:var(--panel-2);border-top:1px solid var(--line-2);border-bottom:1px solid var(--line-2)}
.section-head{
  display:flex;align-items:flex-end;justify-content:space-between;
  gap:24px;flex-wrap:wrap;margin-bottom:44px;
}
.section-num{
  display:inline-block;font-size:13px;letter-spacing:.18em;
  color:var(--primary);margin-bottom:10px;
}
.section-head h2{margin-bottom:0}
.section-desc{margin:12px 0 0;font-size:15px;color:var(--text-3);max-width:560px}
.link-more{
  display:inline-flex;align-items:center;gap:8px;
  font-size:14px;color:var(--primary);padding:8px 4px;border-radius:8px;
}
.link-more:hover{color:#7ff2df}
.link-more i{transition:transform .22s ease-out}
.link-more:hover i{transform:translateX(5px)}
.link-more:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
/* ---------- stat bar ---------- */
.stat-bar{
  display:grid;grid-template-columns:repeat(4,1fr);
  gap:1px;background:var(--line-2);
  border:1px solid var(--line-2);border-radius:var(--radius);overflow:hidden;
  margin-top:-52px;position:relative;z-index:5;
}
.stat-item{background:rgba(11,18,32,.94);padding:26px 24px}
.stat-item i{color:var(--primary);font-size:17px}
.stat-item strong{display:block;margin:12px 0 4px;font-size:26px;font-weight:700;color:var(--text);letter-spacing:.01em}
.stat-item span{font-size:13.5px;color:var(--text-3)}
/* ---------- topic grid ---------- */
.topic-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.topic-card{
  position:relative;display:flex;gap:18px;align-items:flex-start;
  padding:26px 24px;border-radius:var(--radius);
  background:var(--glass);border:1px solid var(--line);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  transition:transform .22s ease-out,border-color .22s ease-out,box-shadow .22s ease-out;
}
.topic-card:hover{transform:translateY(-4px);border-color:rgba(31,224,192,.42);box-shadow:var(--shadow-hover)}
.topic-card:focus-visible{outline:2px solid var(--primary);outline-offset:3px}
.topic-num{
  font-size:34px;font-weight:700;line-height:1;letter-spacing:-.02em;
  color:rgba(232,238,247,.12);transition:color .22s ease-out;flex:0 0 auto;
}
.topic-card:hover .topic-num{color:var(--primary)}
.topic-body{flex:1 1 auto;min-width:0}
.topic-body h3{font-size:17px;margin-bottom:8px}
.topic-body p{font-size:14px;line-height:1.7;color:var(--text-3);margin:0 0 12px}
.topic-foot{display:flex;align-items:center;justify-content:space-between;gap:10px}
.topic-arrow{color:var(--text-3);font-size:14px;transition:transform .22s ease-out,color .22s ease-out}
.topic-card:hover .topic-arrow{color:var(--primary);transform:translateX(6px)}
/* ---------- feature / mini cards ---------- */
.feature-card{
  display:flex;gap:20px;padding:20px;margin-bottom:24px;
  border-radius:var(--radius);background:var(--glass);
  border:1px solid var(--line);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  transition:transform .22s ease-out,border-color .22s ease-out,box-shadow .22s ease-out;
}
.feature-card:last-child{margin-bottom:0}
.feature-card:hover{transform:translateY(-4px);border-color:rgba(31,224,192,.38);box-shadow:var(--shadow-hover)}
.feature-card .thumb{
  flex:0 0 200px;border-radius:var(--radius-sm);overflow:hidden;
  border:1px solid var(--line-2);position:relative;
}
.feature-card .thumb img{width:100%;height:100%;aspect-ratio:16/9;object-fit:cover}
.feature-card .body{flex:1 1 auto;min-width:0;display:flex;flex-direction:column}
.feature-card h3{
  font-size:18px;margin:12px 0 10px;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.feature-card h3 a:hover{color:var(--primary)}
.feature-card p{
  font-size:14px;line-height:1.7;color:var(--text-3);margin:0 0 14px;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.card-meta{display:flex;align-items:center;gap:16px;font-size:13px;color:var(--text-3);margin-top:auto}
.card-meta i{font-size:12px;margin-right:5px}
.mini-list{display:flex;flex-direction:column;gap:14px}
.mini-card{
  display:flex;gap:14px;align-items:center;padding:14px;
  border-radius:14px;background:rgba(255,255,255,.035);
  border:1px solid var(--line);
  transition:transform .2s ease-out,border-color .2s ease-out,background-color .2s ease-out;
}
.mini-card:hover{transform:translateX(4px);border-color:rgba(31,224,192,.42);background:rgba(31,224,192,.07)}
.mini-card:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
.mini-card .thumb{
  flex:0 0 62px;width:62px;aspect-ratio:1/1;border-radius:var(--radius-xs);
  overflow:hidden;border:1px solid var(--line-2);
}
.mini-card .thumb img{width:100%;height:100%;object-fit:cover}
.mini-card h4{
  font-size:15px;font-weight:600;color:var(--text);margin:0 0 6px;
  display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical;overflow:hidden;
}
.mini-card:hover h4{color:var(--primary)}
.mini-card .mini-meta{display:flex;gap:12px;font-size:12.5px;color:var(--text-3)}
/* ---------- post cards (CMS) ---------- */
.post-card{
  height:100%;display:flex;flex-direction:column;
  border-radius:var(--radius);overflow:hidden;
  background:var(--glass);border:1px solid var(--line);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  transition:transform .22s ease-out,border-color .22s ease-out,box-shadow .22s ease-out;
}
.post-card:hover{transform:translateY(-4px);border-color:rgba(31,224,192,.38);box-shadow:var(--shadow-hover)}
.post-cover{display:block;position:relative;overflow:hidden}
.post-cover img{width:100%;aspect-ratio:16/9;object-fit:cover;transition:transform .3s ease-out}
.post-card:hover .post-cover img{transform:scale(1.04)}
.post-body{padding:20px 22px 22px;display:flex;flex-direction:column;flex:1 1 auto}
.post-body h3{
  font-size:17px;margin:12px 0 10px;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.post-body h3 a:hover{color:var(--primary)}
.post-body p{
  font-size:14px;line-height:1.7;color:var(--text-3);margin:0 0 16px;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.post-meta{
  margin-top:auto;display:flex;align-items:center;justify-content:space-between;
  gap:12px;font-size:13px;color:var(--text-3);
  padding-top:14px;border-top:1px solid var(--line-2);
}
.empty-state{
  padding:60px 24px;text-align:center;border-radius:var(--radius);
  border:1px dashed rgba(31,224,192,.3);background:rgba(31,224,192,.04);
}
.empty-state i{font-size:30px;color:var(--primary);opacity:.7}
.empty-state p{margin:16px 0 22px;font-size:15px;color:var(--text-2)}
/* ---------- rail ---------- */
.rail-wrap{position:relative}
.rail{
  display:flex;gap:20px;overflow-x:auto;padding:6px 4px 18px;
  scroll-snap-type:x mandatory;
  -webkit-overflow-scrolling:touch;
}
.rail::-webkit-scrollbar{height:6px}
.rail::-webkit-scrollbar-track{background:rgba(255,255,255,.05);border-radius:3px}
.rail::-webkit-scrollbar-thumb{background:rgba(31,224,192,.35);border-radius:3px}
.rail::-webkit-scrollbar-thumb:hover{background:rgba(31,224,192,.55)}
.rail-card{
  flex:0 0 280px;scroll-snap-align:start;
  border-radius:var(--radius);overflow:hidden;
  background:var(--glass);border:1px solid var(--line);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  transition:transform .22s ease-out,border-color .22s ease-out,box-shadow .22s ease-out;
}
.rail-card:hover{transform:translateY(-4px);border-color:rgba(31,224,192,.4);box-shadow:var(--shadow-hover)}
.rail-card img{width:100%;aspect-ratio:16/9;object-fit:cover}
.rail-card .rail-body{padding:16px 18px 20px}
.rail-card h4{font-size:15.5px;margin:10px 0 8px}
.rail-card:hover h4{color:var(--primary)}
.rail-card p{font-size:13.5px;line-height:1.7;color:var(--text-3);margin:0}
.rail-hint{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;color:var(--text-3);margin-bottom:14px;
}
.rail-hint i{color:var(--primary)}
/* ---------- cta bar ---------- */
.cta-bar{
  display:flex;align-items:center;justify-content:space-between;gap:28px;
  padding:30px 34px;border-radius:18px;
  background:linear-gradient(140deg, rgba(31,224,192,.12), rgba(255,255,255,.03));
  border:1px solid rgba(31,224,192,.24);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
}
.cta-bar h3{font-size:20px;margin-bottom:8px}
.cta-bar p{font-size:14px;color:var(--text-3);margin:0}
.cta-actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
/* ---------- faq ---------- */
.faq-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.faq-item{
  border-radius:14px;background:rgba(255,255,255,.035);
  border:1px solid var(--line);overflow:hidden;
  transition:border-color .22s ease-out,background-color .22s ease-out;
}
.faq-item:hover{border-color:rgba(31,224,192,.32)}
.faq-item[open]{border-color:rgba(31,224,192,.45);background:rgba(31,224,192,.05)}
.faq-item summary{
  list-style:none;display:flex;align-items:center;justify-content:space-between;
  gap:16px;padding:18px 22px;font-size:16px;font-weight:600;color:var(--text);
  cursor:pointer;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary:focus-visible{outline:2px solid var(--primary);outline-offset:-2px}
.faq-icon{
  flex:0 0 auto;width:26px;height:26px;border-radius:50%;
  display:inline-flex;align-items:center;justify-content:center;
  border:1px solid rgba(31,224,192,.4);color:var(--primary);font-size:12px;
  transition:transform .24s ease-out,background-color .24s ease-out;
}
.faq-item[open] .faq-icon{transform:rotate(45deg);background:rgba(31,224,192,.16)}
.faq-body{padding:0 22px 20px;font-size:15px;line-height:1.8;color:var(--text-2)}
/* ---------- footer ---------- */
.site-footer{
  position:relative;overflow:hidden;
  background:var(--panel-2);border-top:1px solid var(--line-2);
  padding:72px 0 0;
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(420px 260px at 8% 10%, rgba(31,224,192,.12), transparent 70%),
    radial-gradient(380px 240px at 92% 90%, rgba(255,92,70,.08), transparent 70%);
}
.site-footer .grid-container{position:relative;z-index:1}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.3fr;gap:40px}
.footer-brand-name{
  font-size:17px;font-weight:700;color:var(--text);margin-bottom:14px;
  display:inline-block;
}
.footer-brand-name:hover{color:var(--primary)}
.footer-brand p{font-size:14px;line-height:1.8;color:var(--text-3);max-width:30em}
.footer-col h4{font-size:15px;margin-bottom:18px;color:var(--text)}
.footer-links li{margin-bottom:12px}
.footer-links a{
  display:inline-block;font-size:14px;color:var(--text-3);
  padding-left:0;border-left:2px solid transparent;
  transition:color .2s ease-out,border-color .2s ease-out,padding-left .2s ease-out;
}
.footer-links a:hover{color:var(--primary);border-left-color:var(--primary);padding-left:8px}
.footer-links a:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
.sub-form{display:flex;flex-direction:column;gap:10px}
.sub-form label{font-size:13px;color:var(--text-3)}
.sub-form input{
  width:100%;height:44px;padding:0 14px;border-radius:var(--radius-xs);
  background:rgba(255,255,255,.04);border:1px solid var(--line);
  color:var(--text);font-size:14px;font-family:inherit;
  transition:border-color .2s ease-out,box-shadow .2s ease-out,background-color .2s ease-out;
}
.sub-form input::placeholder{color:var(--text-3)}
.sub-form input:focus{
  outline:none;border-color:var(--primary);
  box-shadow:0 0 0 3px rgba(31,224,192,.18);
  background:rgba(31,224,192,.06);
}
.sub-form input.is-error{border-color:var(--coral)}
.sub-form .form-note{font-size:12.5px;color:var(--text-3);min-height:18px}
.sub-form .form-note.is-error{color:var(--coral)}
.footer-bottom{
  margin-top:56px;padding:24px 0 30px;border-top:1px solid var(--line-2);
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:var(--text-3);
}
.footer-bottom a:hover{color:var(--primary)}
/* ---------- responsive ---------- */
@media screen and (max-width:1279px){
  .topic-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr;gap:32px}
  .footer-grid .footer-col:last-child{grid-column:1 / -1}
}
@media screen and (max-width:1023px){
  .section{padding:64px 0}
  .hero{padding:56px 0 72px}
  .nav-left,.nav-right{display:none}
  .nav-wrap{grid-template-columns:44px 1fr 44px;height:64px}
  .site-header.is-scrolled .nav-wrap{height:60px}
  .nav-toggle{display:inline-flex}
  .brand{align-items:center;padding:4px 6px}
  .brand-text{font-size:15px}
  .brand-sub{display:none}
  .hero-copy h1{max-width:none}
  .hero-points{gap:10px 20px}
  .stat-bar{grid-template-columns:repeat(2,1fr);margin-top:-40px}
  .faq-grid{grid-template-columns:1fr}
  .cta-bar{flex-direction:column;align-items:flex-start;text-align:left}
  .cta-actions{width:100%}
  .cta-actions .btn{flex:1 1 auto}
}
@media screen and (max-width:767px){
  .topic-grid{grid-template-columns:1fr}
  .feature-card{flex-direction:column}
  .feature-card .thumb{flex:0 0 auto;width:100%}
  .footer-grid{grid-template-columns:1fr;gap:34px}
  .rail-card{flex:0 0 240px}
}
@media screen and (max-width:639px){
  .section{padding:48px 0}
  .hero{padding:40px 0 60px}
  .hero-copy h1{font-size:28px}
  .hero-sub{font-size:15.5px}
  .hero-cta .btn{width:100%}
  .stat-item{padding:20px 18px}
  .stat-item strong{font-size:22px}
  .section-head{margin-bottom:32px}
  .cta-bar{padding:24px 20px}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:10px}
}

/* roulang page: article */
:root{
  --bg:#060A14;
  --panel:#0B1220;
  --bg-alt-a:#080E1A;
  --bg-alt-b:#0A1424;
  --primary:#1FE0C0;
  --primary-deep:#12A98F;
  --coral:#FF5C46;
  --t1:#E8EEF7;
  --t2:#A9B6C9;
  --t3:#6E7C90;
  --line:rgba(255,255,255,.08);
  --line-2:rgba(255,255,255,.12);
  --glass:linear-gradient(160deg,rgba(255,255,255,.07),rgba(255,255,255,.02));
  --r-card:16px;
  --r-ctrl:10px;
  --r-btn:12px;
  --sh-card:0 18px 40px rgba(0,0,0,.45);
  --sh-card-h:0 26px 56px rgba(0,0,0,.55),0 0 0 1px rgba(31,224,192,.35);
  --maxw:1200px;
  --font:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;background:var(--bg);color:var(--t2);
  font-family:var(--font);font-size:16px;line-height:1.75;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
body::before{
  content:"";position:fixed;inset:0;pointer-events:none;z-index:0;
  background:
    radial-gradient(600px 420px at 12% 0%,rgba(31,224,192,.12),transparent 70%),
    radial-gradient(520px 380px at 88% 100%,rgba(255,92,70,.08),transparent 70%);
}
body::after{
  content:"";position:fixed;inset:0;pointer-events:none;z-index:0;opacity:.04;
  background-image:linear-gradient(rgba(255,255,255,.6) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.6) 1px,transparent 1px);
  background-size:32px 32px;
}
img{max-width:100%;height:auto;display:block;}
a{color:inherit;text-decoration:none;transition:color .2s ease-out,border-color .2s ease-out,background-color .2s ease-out;}
a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--primary);outline-offset:2px;}
h1,h2,h3,h4{color:var(--t1);margin:0;font-weight:700;letter-spacing:.01em;}
p{margin:0 0 1.2em;}
ul,ol{margin:0 0 1.2em;padding-left:1.4em;}
button{font-family:inherit;cursor:pointer;}
input{font-family:inherit;}
.grid-container{max-width:var(--maxw);margin:0 auto;padding-left:32px;padding-right:32px;position:relative;z-index:1;}
.glass{background:var(--glass);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border:1px solid rgba(255,255,255,.09);}

/* ============ 顶部阅读进度 ============ */
#readBar{position:fixed;top:0;left:0;height:3px;width:0;background:linear-gradient(90deg,var(--primary),var(--coral));z-index:120;transition:width .12s linear;}

/* ============ 导航 ============ */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(6,10,20,.82);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid var(--line);
  transition:background-color .22s ease-out,border-color .22s ease-out;
}
.site-header.is-scrolled{background:rgba(6,10,20,.95);border-bottom-color:var(--line-2);}
.header-inner{
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;
  gap:24px;height:72px;transition:height .22s ease-out;
}
.site-header.is-scrolled .header-inner{height:60px;}
.nav-left,.nav-right{display:flex;align-items:center;gap:4px;}
.nav-left{justify-content:flex-start;}
.nav-right{justify-content:flex-end;gap:8px;}
.nav-link{
  display:inline-flex;align-items:center;height:44px;padding:0 12px;
  font-size:14px;color:var(--t2);border-radius:var(--r-ctrl);
  position:relative;white-space:nowrap;
}
.nav-link::after{
  content:"";position:absolute;left:12px;right:12px;bottom:6px;height:2px;
  background:var(--primary);transform:scaleX(0);transform-origin:left;transition:transform .22s ease-out;
}
.nav-link:hover{color:var(--t1);}
.nav-link:hover::after,.nav-link.active::after{transform:scaleX(1);}
.nav-link.active{color:var(--t1);font-weight:600;}
.nav-link:active{color:var(--primary);}
.brand{
  display:inline-flex;align-items:center;gap:10px;
  font-size:17px;font-weight:700;color:var(--t1);letter-spacing:.02em;white-space:nowrap;
}
.brand-mark{
  width:10px;height:18px;border-radius:3px;flex:0 0 auto;
  background:linear-gradient(180deg,var(--primary),var(--primary-deep));
  box-shadow:0 0 14px rgba(31,224,192,.55);
}
.brand:hover{color:var(--primary);}
.nav-toggle{
  display:none;width:44px;height:44px;border:1px solid var(--line-2);border-radius:var(--r-ctrl);
  background:rgba(255,255,255,.04);color:var(--t1);align-items:center;justify-content:center;font-size:16px;
}
.nav-toggle:hover{background:rgba(31,224,192,.12);border-color:rgba(31,224,192,.4);}
.drawer{
  display:none;position:fixed;top:72px;left:0;right:0;bottom:0;z-index:99;
  background:rgba(6,10,20,.98);backdrop-filter:blur(16px);
  padding:20px;overflow-y:auto;
}
.drawer.open{display:block;}
.drawer a.drawer-link{
  display:flex;align-items:center;justify-content:space-between;
  height:48px;padding:0 14px;border-radius:var(--r-ctrl);color:var(--t2);font-size:15px;
  border:1px solid transparent;
}
.drawer a.drawer-link:hover,.drawer a.drawer-link.active{background:rgba(31,224,192,.1);border-color:rgba(31,224,192,.28);color:var(--t1);}
.drawer .drawer-cta{margin-top:16px;}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border-radius:var(--r-btn);border:1px solid transparent;font-weight:600;
  padding:0 20px;height:44px;font-size:15px;cursor:pointer;
  transition:transform .18s ease-out,box-shadow .18s ease-out,background-color .18s ease-out,border-color .18s ease-out,color .18s ease-out;
}
.btn-sm{height:38px;padding:0 16px;font-size:14px;}
.btn-primary{
  background:var(--primary);color:#04121A;
  box-shadow:0 0 0 1px rgba(31,224,192,.5),0 10px 30px rgba(31,224,192,.28);
}
.btn-primary:hover{filter:brightness(1.08);transform:translateY(-2px);box-shadow:0 0 0 1px rgba(31,224,192,.6),0 16px 36px rgba(31,224,192,.36);}
.btn-primary:active{transform:translateY(1px);box-shadow:0 0 0 1px rgba(31,224,192,.5),0 6px 16px rgba(31,224,192,.3);}
.btn-ghost{
  background:var(--glass);color:var(--t1);border-color:rgba(31,224,192,.42);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
}
.btn-ghost:hover{background:rgba(31,224,192,.12);border-color:var(--primary);transform:translateY(-2px);}
.btn-ghost:active{transform:translateY(1px);}
.btn-block{width:100%;}

/* ============ 徽章 / 标签 ============ */
.badge{
  display:inline-flex;align-items:center;gap:6px;padding:6px 12px;border-radius:999px;
  font-size:12px;line-height:1.2;letter-spacing:.02em;border:1px solid transparent;white-space:nowrap;
}
.badge-primary{color:var(--primary);border-color:rgba(31,224,192,.45);background:rgba(31,224,192,.08);}
.badge-coral{color:#2A0B06;background:var(--coral);font-weight:600;}
.badge-plain{color:var(--t2);border-color:var(--line-2);background:rgba(255,255,255,.04);}

/* ============ 面包屑 ============ */
.crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-size:13px;color:var(--t3);padding:24px 0 0;
}
.crumbs a{color:var(--t3);}
.crumbs a:hover{color:var(--primary);}
.crumbs .sep{color:rgba(255,255,255,.2);}
.crumbs .cur{color:var(--t2);max-width:52ch;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}

/* ============ 文章头部 ============ */
.article-head{padding-bottom:8px;}
.head-panel{
  position:relative;margin-top:20px;padding:36px 36px 32px;border-radius:var(--r-card);
  border:1px solid var(--line);overflow:hidden;
  background-image:linear-gradient(100deg,rgba(6,10,20,.94) 30%,rgba(6,10,20,.72) 100%),url("/assets/images/backpic/back-2.png");
  background-size:cover;background-position:center;
}
.head-panel::after{
  content:"";position:absolute;left:36px;top:36px;width:3px;height:22px;border-radius:2px;
  background:linear-gradient(180deg,var(--primary),var(--primary-deep));box-shadow:0 0 14px rgba(31,224,192,.5);
}
.head-panel h1{
  font-size:clamp(28px,4vw,44px);line-height:1.22;font-weight:700;margin:18px 0 18px;
  max-width:22ch;
}
.meta-row{display:flex;flex-wrap:wrap;align-items:center;gap:14px;font-size:13px;color:var(--t3);letter-spacing:.02em;}
.meta-row .dot{width:4px;height:4px;border-radius:50%;background:rgba(255,255,255,.22);}
.meta-row i{color:var(--primary);margin-right:4px;font-size:12px;}

/* ============ 主体两栏 ============ */
.article-main{padding:48px 0 0;}
.layout{display:grid;grid-template-columns:minmax(0,2fr) minmax(0,1fr);gap:40px;align-items:start;}
.article-body{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--r-card);
  padding:40px 44px;box-shadow:var(--sh-card);max-width:100%;
}
.article-body>*:first-child{margin-top:0;}
.article-body h2{
  font-size:clamp(21px,2.4vw,26px);line-height:1.35;margin:2.4em 0 .8em;position:relative;padding-left:16px;
}
.article-body h2::before{
  content:"";position:absolute;left:0;top:.34em;width:3px;height:.9em;border-radius:2px;
  background:linear-gradient(180deg,var(--primary),var(--primary-deep));
}
.article-body h3{font-size:19px;line-height:1.45;margin:1.9em 0 .7em;color:var(--t1);}
.article-body h4{font-size:17px;margin:1.6em 0 .6em;}
.article-body p{color:var(--t2);margin:0 0 1.4em;}
.article-body a{color:var(--primary);border-bottom:1px solid rgba(31,224,192,.35);}
.article-body a:hover{color:#7ff3e0;border-bottom-color:#7ff3e0;}
.article-body strong{color:var(--t1);}
.article-body ul,.article-body ol{color:var(--t2);padding-left:1.5em;}
.article-body li{margin-bottom:.6em;}
.article-body li::marker{color:var(--primary);}
.article-body blockquote{
  margin:1.8em 0;padding:18px 22px;border-left:3px solid var(--primary);
  background:var(--glass);border-radius:0 var(--r-ctrl) var(--r-ctrl) 0;color:var(--t1);
}
.article-body blockquote p:last-child{margin-bottom:0;}
.article-body img{border-radius:14px;border:1px solid var(--line);margin:1.6em 0;}
.article-body figure{margin:1.8em 0;}
.article-body figcaption{font-size:13px;color:var(--t3);text-align:center;margin-top:10px;}
.article-body code{
  font-family:"SFMono-Regular",Consolas,Menlo,monospace;font-size:13px;color:var(--primary);
  background:rgba(31,224,192,.08);border:1px solid rgba(31,224,192,.18);border-radius:6px;padding:2px 6px;
}
.article-body pre{
  background:#050912;border:1px solid var(--line);border-radius:var(--r-card);
  padding:18px 20px;overflow-x:auto;margin:1.6em 0;
}
.article-body pre code{background:none;border:0;padding:0;color:#8ff0e0;font-size:13px;line-height:1.7;}
.article-body table{width:100%;border-collapse:collapse;margin:1.6em 0;font-size:14px;}
.article-body th,.article-body td{border:1px solid var(--line);padding:12px 14px;text-align:left;}
.article-body th{background:rgba(255,255,255,.04);color:var(--t1);font-weight:600;}

/* ============ 侧栏 ============ */
.sidebar{position:sticky;top:88px;display:flex;flex-direction:column;gap:24px;}
.side-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--r-card);padding:22px;box-shadow:var(--sh-card);}
.side-title{
  display:flex;align-items:center;gap:8px;font-size:15px;font-weight:700;color:var(--t1);
  margin:0 0 16px;padding-bottom:12px;border-bottom:1px solid var(--line);
}
.side-title i{color:var(--primary);font-size:13px;}
.toc-list{list-style:none;margin:0;padding:0;max-height:320px;overflow-y:auto;}
.toc-list li{margin:0;}
.toc-list a{
  display:block;padding:8px 10px;border-left:2px solid transparent;border-radius:0 8px 8px 0;
  font-size:13.5px;color:var(--t2);line-height:1.5;
}
.toc-list a:hover{background:rgba(31,224,192,.08);color:var(--t1);}
.toc-list a.active{border-left-color:var(--primary);background:rgba(31,224,192,.1);color:var(--primary);}
.toc-list a.lv3{padding-left:22px;font-size:13px;color:var(--t3);}
.toc-empty{font-size:13px;color:var(--t3);}
.hot-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:12px;}
.hot-item{display:flex;gap:12px;align-items:flex-start;padding:8px;border-radius:var(--r-ctrl);border:1px solid transparent;transition:background-color .2s ease-out,border-color .2s ease-out,transform .2s ease-out;}
.hot-item:hover{background:rgba(255,255,255,.04);border-color:var(--line-2);transform:translateX(3px);}
.hot-thumb{width:56px;height:56px;flex:0 0 56px;border-radius:10px;overflow:hidden;border:1px solid var(--line);position:relative;background:var(--bg-alt-b);}
.hot-thumb img{width:100%;height:100%;object-fit:cover;}
.hot-body{min-width:0;}
.hot-body h4{font-size:14px;line-height:1.5;color:var(--t2);font-weight:500;margin:0 0 4px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.hot-item:hover .hot-body h4{color:var(--t1);}
.hot-body span{font-size:12px;color:var(--t3);}
.side-cta{background-image:linear-gradient(160deg,rgba(31,224,192,.14),rgba(255,92,70,.06));border:1px solid rgba(31,224,192,.3);}
.side-cta h3{font-size:17px;margin:0 0 8px;}
.side-cta p{font-size:13.5px;color:var(--t2);margin:0 0 16px;}

/* ============ 文末操作条 ============ */
.after-body{margin-top:28px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;
  background:var(--glass);border:1px solid rgba(255,255,255,.09);border-radius:var(--r-card);padding:18px 24px;backdrop-filter:blur(14px);}
.after-body .txt{font-size:14px;color:var(--t1);font-weight:600;}
.after-actions{display:flex;align-items:center;gap:10px;}
.icon-btn{
  width:44px;height:44px;border-radius:var(--r-ctrl);border:1px solid var(--line-2);
  background:rgba(255,255,255,.04);color:var(--t2);display:inline-flex;align-items:center;justify-content:center;
  transition:background-color .18s ease-out,color .18s ease-out,border-color .18s ease-out,transform .18s ease-out;
}
.icon-btn:hover{color:var(--primary);border-color:rgba(31,224,192,.45);background:rgba(31,224,192,.1);transform:translateY(-2px);}
.icon-btn:active{transform:translateY(0);}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:24px;}
.tag-row a{transition:background-color .18s ease-out,border-color .18s ease-out,color .18s ease-out;}
.tag-row a:hover{background:rgba(31,224,192,.14);border-color:var(--primary);color:var(--t1);}

/* ============ 空态 ============ */
.empty-state{
  text-align:center;padding:72px 32px;border:1px dashed rgba(255,255,255,.16);border-radius:var(--r-card);
  background:var(--panel);
}
.empty-state .glyph{
  width:64px;height:64px;margin:0 auto 20px;border-radius:18px;display:flex;align-items:center;justify-content:center;
  background:var(--glass);border:1px solid rgba(31,224,192,.3);color:var(--primary);font-size:24px;
}
.empty-state h2{font-size:20px;margin-bottom:10px;}
.empty-state p{color:var(--t3);margin-bottom:24px;}

/* ============ 相关推荐 ============ */
.related{padding:80px 0 0;}
.sec-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:32px;}
.sec-head h2{font-size:clamp(22px,2.8vw,30px);line-height:1.3;display:flex;align-items:center;gap:12px;}
.sec-head h2::before{content:"";width:3px;height:24px;border-radius:2px;background:linear-gradient(180deg,var(--primary),var(--primary-deep));}
.sec-head p{font-size:14px;color:var(--t3);margin:8px 0 0;max-width:62ch;}
.rel-card{
  display:flex;flex-direction:column;height:100%;background:var(--panel);
  border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;box-shadow:var(--sh-card);
  transition:transform .22s ease-out,box-shadow .22s ease-out,border-color .22s ease-out;
}
.rel-card:hover{transform:translateY(-4px);box-shadow:var(--sh-card-h);border-color:rgba(31,224,192,.32);}
.rel-thumb{position:relative;aspect-ratio:16/9;overflow:hidden;background:var(--bg-alt-b);}
.rel-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease-out;}
.rel-card:hover .rel-thumb img{transform:scale(1.05);}
.rel-body{padding:20px;display:flex;flex-direction:column;gap:10px;flex:1;}
.rel-body h3{font-size:17px;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.rel-body p{font-size:13.5px;line-height:1.7;color:var(--t3);margin:0;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.rel-foot{display:flex;align-items:center;justify-content:space-between;margin-top:auto;padding-top:12px;border-top:1px solid var(--line);font-size:12.5px;color:var(--t3);}
.rel-foot .more{color:var(--primary);display:inline-flex;align-items:center;gap:6px;}
.rel-card:hover .rel-foot .more i{transform:translateX(4px);}
.rel-foot .more i{transition:transform .2s ease-out;}

/* ============ 上一篇 / 下一篇 ============ */
.prevnext{padding:64px 0 0;}
.pn-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
.pn-card{
  display:flex;flex-direction:column;gap:8px;padding:22px 24px;border-radius:var(--r-card);
  background:var(--panel);border:1px solid var(--line);transition:border-color .2s ease-out,transform .2s ease-out,background-color .2s ease-out;
}
.pn-card:hover{border-color:rgba(31,224,192,.4);background:var(--bg-alt-b);transform:translateY(-3px);}
.pn-card .k{font-size:12.5px;color:var(--t3);letter-spacing:.06em;}
.pn-card .v{font-size:15px;color:var(--t1);font-weight:600;display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical;overflow:hidden;}
.pn-card.next{text-align:right;align-items:flex-end;}

/* ============ 返回列表 ============ */
.back-line{padding:48px 0 0;display:flex;justify-content:center;}

/* ============ 页脚 ============ */
.site-footer{
  margin-top:96px;border-top:1px solid var(--line);position:relative;z-index:1;
  background-image:
    radial-gradient(680px 320px at 10% 100%,rgba(31,224,192,.1),transparent 70%),
    radial-gradient(560px 300px at 92% 100%,rgba(255,92,70,.07),transparent 70%),
    linear-gradient(180deg,var(--bg-alt-a),var(--bg));
}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.4fr;gap:40px;padding:64px 0 40px;}
.footer-brand-name{display:inline-block;font-size:17px;font-weight:700;color:var(--t1);margin-bottom:14px;}
.footer-brand-name:hover{color:var(--primary);}
.footer-brand p{font-size:13.5px;color:var(--t3);line-height:1.8;margin:0;max-width:34ch;}
.footer-col h4{font-size:14px;color:var(--t1);margin:0 0 16px;letter-spacing:.04em;}
.footer-links{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:2px;}
.footer-links a{
  display:inline-block;padding:7px 0 7px 10px;font-size:13.5px;color:var(--t3);
  border-left:2px solid transparent;
}
.footer-links a:hover{color:var(--primary);border-left-color:var(--primary);}
.sub-form{display:flex;flex-direction:column;gap:10px;}
.sub-form label{font-size:13px;color:var(--t3);line-height:1.7;}
.sub-form input{
  height:44px;border-radius:var(--r-ctrl);border:1px solid var(--line-2);
  background:rgba(255,255,255,.04);color:var(--t1);padding:0 14px;font-size:14px;
  transition:border-color .2s ease-out,box-shadow .2s ease-out;
}
.sub-form input::placeholder{color:var(--t3);}
.sub-form input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(31,224,192,.2);}
.form-note{font-size:12px;color:var(--t3);}
.form-note.err{color:var(--coral);}
.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;
  padding:20px 0 32px;border-top:1px solid var(--line);font-size:12.5px;color:var(--t3);
}

/* ============ 响应式 ============ */
@media screen and (max-width:1023px){
  .nav-left,.nav-right .nav-link{display:none;}
  .nav-toggle{display:inline-flex;}
  .header-inner{grid-template-columns:auto 1fr auto;height:64px;gap:12px;}
  .brand{font-size:16px;justify-self:center;}
  .nav-right{gap:10px;}
  .layout{grid-template-columns:1fr;gap:32px;}
  .sidebar{position:static;}
  .article-body{padding:32px 26px;}
  .head-panel{padding:28px 24px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;padding:48px 0 32px;}
  .related{padding-top:64px;}
}
@media screen and (max-width:767px){
  .grid-container{padding-left:20px;padding-right:20px;}
  .drawer{top:64px;}
  .crumbs{padding-top:18px;font-size:12.5px;}
  .crumbs .cur{max-width:100%;}
  .head-panel{padding:24px 20px;}
  .head-panel::after{left:20px;top:24px;}
  .head-panel h1{font-size:clamp(24px,6.4vw,30px);max-width:100%;}
  .meta-row{gap:10px;font-size:12.5px;}
  .article-body{padding:26px 20px;}
  .article-body h2{font-size:20px;}
  .article-body h3{font-size:17.5px;}
  .pn-grid{grid-template-columns:1fr;}
  .pn-card.next{text-align:left;align-items:flex-start;}
  .footer-grid{grid-template-columns:1fr;gap:28px;}
  .after-body{flex-direction:column;align-items:stretch;}
  .after-actions{justify-content:space-between;}
  .after-actions .btn{flex:1;}
  .related{padding-top:56px;}
  .site-footer{margin-top:64px;}
}
@media screen and (max-width:520px){
  .brand{font-size:15px;}
  .brand-mark{width:8px;height:15px;}
  .btn{padding:0 16px;font-size:14px;}
  .empty-state{padding:48px 20px;}
}

/* roulang page: category1 */
:root{
  --bg:#060A14;
  --bg-alt:#080E1A;
  --panel:#0B1220;
  --panel-2:#0A1424;
  --primary:#1FE0C0;
  --primary-deep:#12A98F;
  --coral:#FF5C46;
  --text:#E8EEF7;
  --muted:#A9B6C9;
  --dim:#6E7C90;
  --line:rgba(255,255,255,.07);
  --line-2:rgba(255,255,255,.12);
  --glass:linear-gradient(160deg,rgba(255,255,255,.07),rgba(255,255,255,.02));
  --radius-card:16px;
  --radius-sm:10px;
  --radius-btn:12px;
  --shadow-card:0 18px 40px rgba(0,0,0,.45);
  --shadow-hover:0 26px 56px rgba(0,0,0,.55),0 0 0 1px rgba(31,224,192,.35);
  --ease:180ms ease-out;
  --ease-slow:240ms ease-out;
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  margin:0;padding:0;
  background:var(--bg);
  color:var(--text);
  font-family:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:16px;line-height:1.75;font-weight:400;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4,h5,h6{margin:0;color:var(--text);font-weight:700;line-height:1.3;}
p{margin:0 0 1.2em;color:var(--muted);}
p:last-child{margin-bottom:0;}
a{color:inherit;text-decoration:none;transition:color var(--ease);}
img{max-width:100%;display:block;height:auto;}
ul,ol{margin:0;padding:0;list-style:none;}
button{font:inherit;color:inherit;border:0;background:none;cursor:pointer;}
input,textarea{font:inherit;}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:4px;}
::selection{background:rgba(31,224,192,.28);color:#fff;}

.grid-container{max-width:1200px;margin:0 auto;padding-left:32px;padding-right:32px;}
.sec{padding:96px 0;}
.sec-alt{background:var(--bg-alt);}
.sec-panel{background:var(--panel);}

/* ============ 导航 ============ */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(6,10,20,.86);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid var(--line);
  transition:background var(--ease-slow),border-color var(--ease-slow);
}
.site-header.is-scrolled{background:rgba(6,10,20,.97);border-bottom-color:var(--line-2);}
.nav-bar{
  display:flex;align-items:center;justify-content:space-between;gap:24px;
  height:72px;transition:height var(--ease-slow);
}
.site-header.is-scrolled .nav-bar{height:60px;}
.nav-left,.nav-links{display:flex;align-items:center;gap:22px;}
.nav-right{display:flex;align-items:center;gap:16px;}
.nav-link{
  position:relative;display:inline-flex;align-items:center;
  min-height:44px;padding:0 2px;font-size:15px;color:var(--muted);
  transition:color var(--ease);
}
.nav-link::after{
  content:'';position:absolute;left:0;right:100%;bottom:12px;height:2px;
  background:var(--primary);border-radius:2px;transition:right var(--ease-slow);
}
.nav-link:hover{color:var(--text);}
.nav-link:hover::after{right:0;}
.nav-link:active{color:var(--primary);}
.nav-link.is-active{color:var(--text);font-weight:600;}
.nav-link.is-active::after{right:0;}
.brand{
  display:inline-flex;align-items:center;gap:10px;
  font-size:18px;font-weight:700;letter-spacing:.01em;color:var(--text);
  white-space:nowrap;transition:color var(--ease);
}
.brand:hover{color:var(--primary);}
.brand-mark{
  width:10px;height:18px;border-radius:3px;
  background:linear-gradient(180deg,var(--primary),var(--primary-deep));
  box-shadow:0 0 12px rgba(31,224,192,.6);
}
.brand-text{position:relative;}
.brand-text::after{
  content:'';position:absolute;left:0;bottom:-4px;width:100%;height:1px;
  background:linear-gradient(90deg,var(--primary),rgba(31,224,192,0));
}
.nav-tools{display:flex;align-items:center;gap:8px;}
.icon-btn{
  display:inline-flex;align-items:center;justify-content:center;
  width:38px;height:38px;border-radius:10px;
  color:var(--muted);border:1px solid transparent;
  transition:all var(--ease);
}
.icon-btn:hover{color:var(--primary);background:rgba(31,224,192,.1);border-color:rgba(31,224,192,.3);}
.icon-btn:active{transform:translateY(1px);}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:0 22px;border-radius:var(--radius-btn);
  font-size:15px;font-weight:600;white-space:nowrap;cursor:pointer;
  border:1px solid transparent;transition:all var(--ease-slow);
}
.btn-primary{
  background:var(--primary);color:#04121A;
  box-shadow:0 0 0 1px rgba(31,224,192,.5),0 10px 30px rgba(31,224,192,.28);
}
.btn-primary:hover{
  filter:brightness(1.08);transform:translateY(-2px);
  box-shadow:0 0 0 1px rgba(31,224,192,.6),0 16px 36px rgba(31,224,192,.36);
}
.btn-primary:active{transform:translateY(1px);filter:brightness(.98);}
.btn-ghost{
  background:rgba(255,255,255,.04);border-color:rgba(31,224,192,.45);color:var(--primary);
}
.btn-ghost:hover{background:rgba(31,224,192,.12);transform:translateY(-2px);}
.btn-ghost:active{transform:translateY(1px);}
.nav-cta{min-height:40px;padding:0 18px;font-size:14px;}
.nav-toggle{display:none;flex-direction:column;justify-content:center;gap:5px;width:44px;height:44px;border-radius:10px;}
.nav-toggle span{display:block;width:20px;height:2px;background:var(--text);border-radius:2px;margin:0 auto;transition:all var(--ease);}
.nav-toggle:hover span{background:var(--primary);}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}
.mobile-drawer{display:none;}

/* ============ 面包屑 ============ */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  font-size:13px;color:var(--dim);letter-spacing:.02em;margin-bottom:22px;
}
.breadcrumb a{color:var(--dim);}
.breadcrumb a:hover{color:var(--primary);}
.breadcrumb .sep{color:rgba(255,255,255,.2);}
.breadcrumb .current{color:var(--muted);}

/* ============ 分类 Hero ============ */
.category-hero{
  position:relative;overflow:hidden;
  background:var(--bg-alt);
  border-bottom:1px solid var(--line);
  padding:40px 0 52px;
}
.category-hero::before{
  content:'';position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(520px 320px at 12% 8%,rgba(31,224,192,.12),transparent 70%),
    radial-gradient(420px 300px at 88% 92%,rgba(255,92,70,.08),transparent 70%);
}
.category-hero::after{
  content:'';position:absolute;inset:0;pointer-events:none;opacity:.04;
  background-image:linear-gradient(rgba(255,255,255,.6) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.6) 1px,transparent 1px);
  background-size:32px 32px;
}
.category-hero .grid-container{position:relative;z-index:2;}
.hero-row{align-items:center;}
.hero-copy{padding-right:16px;}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 14px;border-radius:999px;font-size:12px;letter-spacing:.06em;
  color:var(--primary);border:1px solid rgba(31,224,192,.4);
  background:rgba(31,224,192,.08);margin-bottom:20px;
}
.hero-badge .dot{width:6px;height:6px;border-radius:50%;background:var(--primary);box-shadow:0 0 10px var(--primary);}
h1.hero-title{
  font-size:clamp(30px,4.6vw,48px);line-height:1.2;font-weight:700;
  letter-spacing:-.01em;margin-bottom:16px;
}
h1.hero-title em{font-style:normal;color:var(--primary);}
.hero-sub{font-size:17px;line-height:1.7;color:var(--muted);margin-bottom:8px;max-width:620px;}
.hero-desc{font-size:15px;line-height:1.8;color:var(--dim);max-width:640px;margin-bottom:26px;}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;}
.hero-visual{padding-left:16px;}
.hero-visual .frame{
  position:relative;border-radius:20px;overflow:hidden;
  border:1px solid var(--line-2);
  box-shadow:var(--shadow-card);
  aspect-ratio:16/10;
}
.hero-visual .frame img{width:100%;height:100%;object-fit:cover;}
.hero-visual .frame::after{
  content:'';position:absolute;inset:0;
  background:linear-gradient(150deg,rgba(31,224,192,.22),rgba(6,10,20,.05) 55%,rgba(6,10,20,.55));
}
.hero-float{
  position:absolute;right:16px;bottom:16px;z-index:3;
  display:flex;align-items:center;gap:12px;
  padding:12px 16px;border-radius:14px;
  background:rgba(11,18,32,.72);
  border:1px solid rgba(255,255,255,.12);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
}
.hero-float .num{font-size:22px;font-weight:700;color:var(--primary);line-height:1;font-family:Inter,system-ui,sans-serif;}
.hero-float .txt{font-size:12px;color:var(--muted);line-height:1.5;}

/* ============ 数据条 ============ */
.stat-strip{padding:0 0 8px;}
.stat-item{
  height:100%;padding:24px 22px;border-radius:var(--radius-card);
  background:var(--glass);border:1px solid rgba(255,255,255,.09);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  transition:transform var(--ease-slow),box-shadow var(--ease-slow),border-color var(--ease-slow);
}
.stat-item:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);border-color:rgba(31,224,192,.32);}
.stat-item .num{
  font-size:28px;font-weight:700;color:var(--primary);line-height:1.1;
  font-family:Inter,system-ui,sans-serif;letter-spacing:-.02em;margin-bottom:6px;
}
.stat-item .num small{font-size:14px;font-weight:600;color:var(--muted);margin-left:4px;letter-spacing:0;}
.stat-item .label{font-size:14px;font-weight:600;color:var(--text);margin-bottom:4px;}
.stat-item .desc{font-size:13px;color:var(--dim);line-height:1.65;}

/* ============ 板块标题 ============ */
.sec-head{margin-bottom:44px;max-width:760px;}
.chapter-no{
  display:block;font-size:12px;letter-spacing:.22em;color:var(--primary);
  margin-bottom:12px;font-weight:600;
}
.sec-title{
  font-size:clamp(24px,3.2vw,34px);line-height:1.3;font-weight:700;
  display:flex;align-items:flex-start;gap:12px;margin-bottom:14px;
}
.sec-title::before{
  content:'';flex:none;width:3px;height:22px;margin-top:8px;border-radius:2px;
  background:linear-gradient(180deg,var(--primary),var(--primary-deep));
  box-shadow:0 0 12px rgba(31,224,192,.55);
}
.sec-desc{font-size:15px;line-height:1.8;color:var(--muted);}

/* ============ 交错图文 ============ */
.feature-row{margin-bottom:64px;}
.feature-row:last-child{margin-bottom:0;}
.feature-media .frame{
  position:relative;border-radius:14px;overflow:hidden;
  border:1px solid var(--line);box-shadow:var(--shadow-card);
  aspect-ratio:4/3;background:var(--panel-2);
  transition:box-shadow var(--ease-slow),transform var(--ease-slow);
}
.feature-media .frame:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);}
.feature-media .frame img{width:100%;height:100%;object-fit:cover;}
.feature-media .frame::after{
  content:'';position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(6,10,20,0),rgba(6,10,20,.45));
}
.feature-body{padding:0 8px;}
.feature-body h2{
  font-size:clamp(20px,2.4vw,26px);line-height:1.35;margin-bottom:14px;
}
.feature-body p{font-size:15px;line-height:1.8;color:var(--muted);margin-bottom:20px;}
.feature-points li{
  display:flex;align-items:flex-start;gap:12px;
  padding:12px 0;border-top:1px solid var(--line);
  font-size:15px;color:var(--muted);line-height:1.7;
}
.feature-points li:last-child{border-bottom:1px solid var(--line);}
.feature-points li .tick{
  flex:none;width:18px;height:18px;margin-top:4px;border-radius:6px;
  background:rgba(31,224,192,.14);border:1px solid rgba(31,224,192,.4);
  position:relative;
}
.feature-points li .tick::after{
  content:'';position:absolute;left:5px;top:4px;width:5px;height:8px;
  border-right:2px solid var(--primary);border-bottom:2px solid var(--primary);
  transform:rotate(42deg);
}
.badge{
  display:inline-flex;align-items:center;
  padding:8px 12px;border-radius:999px;font-size:11.5px;font-weight:600;
  letter-spacing:.04em;line-height:1;
}
.badge-line{color:var(--primary);border:1px solid rgba(31,224,192,.45);background:rgba(31,224,192,.08);}
.badge-coral{color:#2A0A05;background:var(--coral);box-shadow:0 6px 18px rgba(255,92,70,.3);}
.feature-badges{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:16px;}

/* ============ FAQ ============ */
.faq-accordion{background:transparent;border:0;margin:0;}
.faq-accordion .accordion-item{
  background:var(--glass);
  border:1px solid rgba(255,255,255,.09);
  border-radius:var(--radius-card);
  margin-bottom:14px;overflow:hidden;
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  transition:border-color var(--ease-slow),box-shadow var(--ease-slow);
}
.faq-accordion .accordion-item:hover{border-color:rgba(31,224,192,.3);box-shadow:0 18px 40px rgba(0,0,0,.4);}
.faq-accordion .accordion-item.is-active{border-color:rgba(31,224,192,.45);}
.faq-accordion .accordion-title{
  position:relative;display:block;border:0;
  padding:20px 56px 20px 22px;
  font-size:16px;font-weight:600;color:var(--text);line-height:1.6;
  background:transparent;transition:color var(--ease);
}
.faq-accordion .accordion-title:hover{color:var(--primary);}
.faq-accordion .accordion-title::before{
  content:'+';position:absolute;right:22px;top:50%;
  transform:translateY(-50%);font-size:22px;font-weight:400;
  color:var(--primary);line-height:1;transition:transform var(--ease-slow);
}
.faq-accordion .accordion-item.is-active .accordion-title::before{transform:translateY(-50%) rotate(45deg);}
.faq-accordion .accordion-content{
  border:0;background:transparent;padding:0 22px 22px;
  font-size:15px;line-height:1.8;color:var(--muted);
}
.faq-accordion .accordion-content p{margin:0;color:var(--muted);}

/* ============ CTA 条 ============ */
.cta-bar{
  display:flex;align-items:center;justify-content:space-between;gap:28px;
  padding:32px 36px;border-radius:20px;
  background:var(--glass);
  border:1px solid rgba(255,255,255,.1);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  box-shadow:var(--shadow-card);
  position:relative;overflow:hidden;
}
.cta-bar::before{
  content:'';position:absolute;right:-60px;top:-60px;width:240px;height:240px;
  background:radial-gradient(circle,rgba(31,224,192,.18),transparent 70%);
  pointer-events:none;
}
.cta-bar h2{font-size:clamp(20px,2.2vw,26px);margin-bottom:8px;}
.cta-bar p{font-size:15px;color:var(--muted);margin:0;}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px;position:relative;z-index:2;}

/* ============ 相关分类 ============ */
.rel-card{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  height:100%;padding:20px 22px;border-radius:var(--radius-card);
  background:linear-gradient(160deg,rgba(255,255,255,.06),rgba(255,255,255,.02));
  border:1px solid rgba(255,255,255,.09);
  transition:transform var(--ease-slow),box-shadow var(--ease-slow),border-color var(--ease-slow);
}
.rel-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);border-color:rgba(31,224,192,.34);}
.rel-card .rel-name{font-size:15px;font-weight:600;color:var(--text);display:block;margin-bottom:4px;}
.rel-card .rel-note{font-size:12.5px;color:var(--dim);}
.rel-card .arrow{color:var(--dim);transition:transform var(--ease-slow),color var(--ease-slow);flex:none;}
.rel-card:hover .arrow{transform:translateX(6px);color:var(--primary);}

/* ============ 页脚 ============ */
.site-footer{
  position:relative;overflow:hidden;
  background:var(--bg-alt);
  border-top:1px solid var(--line);
  padding:72px 0 28px;
}
.site-footer::before{
  content:'';position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(420px 300px at 8% 100%,rgba(31,224,192,.1),transparent 70%),
    radial-gradient(380px 280px at 92% 100%,rgba(255,92,70,.07),transparent 70%);
}
.site-footer .grid-container{position:relative;z-index:2;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.3fr;gap:40px;}
.footer-brand-name{
  display:inline-block;font-size:18px;font-weight:700;color:var(--text);
  margin-bottom:14px;transition:color var(--ease);
}
.footer-brand-name:hover{color:var(--primary);}
.footer-brand p{font-size:13.5px;line-height:1.8;color:var(--dim);max-width:300px;}
.footer-col h4{font-size:14px;font-weight:600;color:var(--text);margin-bottom:16px;letter-spacing:.04em;}
.footer-links li{margin-bottom:10px;}
.footer-links a{
  position:relative;display:inline-block;padding-left:0;
  font-size:13.5px;color:var(--muted);transition:color var(--ease),padding-left var(--ease);
}
.footer-links a::before{
  content:'';position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:2px;height:0;background:var(--primary);border-radius:2px;transition:height var(--ease);
}
.footer-links a:hover{color:var(--primary);padding-left:10px;}
.footer-links a:hover::before{height:14px;}
.sub-form label{display:block;font-size:13px;color:var(--dim);line-height:1.7;margin-bottom:12px;}
.sub-form input{
  width:100%;height:44px;padding:0 14px;margin-bottom:10px;
  border-radius:var(--radius-sm);
  background:rgba(255,255,255,.04);
  border:1px solid rgba(255,255,255,.1);
  color:var(--text);font-size:14px;
  transition:border-color var(--ease),box-shadow var(--ease);
}
.sub-form input::placeholder{color:var(--dim);}
.sub-form input:focus{
  outline:none;border-color:var(--primary);
  box-shadow:0 0 0 3px rgba(31,224,192,.16);
}
.sub-form input.is-error{border-color:var(--coral);box-shadow:0 0 0 3px rgba(255,92,70,.14);}
.form-note{display:block;font-size:12px;color:var(--dim);line-height:1.6;margin-bottom:12px;}
.form-note.is-error{color:var(--coral);}
.btn-block{width:100%;}
.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;
  margin-top:52px;padding-top:22px;border-top:1px solid var(--line);
  font-size:12.5px;color:var(--dim);
}

/* ============ 响应式 ============ */
@media (max-width:1279px){
  .footer-grid{grid-template-columns:1.3fr 1fr 1fr;gap:32px;}
  .footer-brand{grid-column:1 / -1;}
  .footer-brand p{max-width:520px;}
}
@media (max-width:1023px){
  .grid-container{padding-left:24px;padding-right:24px;}
  .sec{padding:64px 0;}
  .nav-left,.nav-links,.nav-tools,.nav-cta{display:none;}
  .nav-toggle{display:flex;}
  .nav-bar{height:64px;}
  .site-header.is-scrolled .nav-bar{height:58px;}
  .mobile-drawer{
    display:block;position:fixed;left:0;right:0;top:64px;bottom:0;z-index:70;
    padding:20px 24px 40px;overflow-y:auto;
    background:rgba(6,10,20,.98);
    backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
    opacity:0;visibility:hidden;transform:translateY(-12px);
    transition:opacity var(--ease-slow),transform var(--ease-slow),visibility var(--ease-slow);
  }
  .mobile-drawer.is-open{opacity:1;visibility:visible;transform:translateY(0);}
  .mobile-drawer .drawer-label{
    font-size:12px;letter-spacing:.18em;color:var(--dim);margin-bottom:12px;
  }
  .drawer-link{
    display:flex;align-items:center;justify-content:space-between;
    height:48px;padding:0 4px;font-size:15px;color:var(--muted);
    border-bottom:1px solid var(--line);transition:color var(--ease),padding-left var(--ease);
  }
  .drawer-link:hover,.drawer-link.is-active{color:var(--primary);padding-left:8px;}
  .drawer-link .arrow{color:var(--dim);transition:transform var(--ease);}
  .drawer-link:hover .arrow{transform:translateX(4px);color:var(--primary);}
  .drawer-cta{margin-top:24px;}
  body.drawer-open{overflow:hidden;}
  .hero-copy{padding-right:0;margin-bottom:32px;}
  .hero-visual{padding-left:0;}
  .hero-desc{max-width:100%;}
}
@media (max-width:767px){
  .footer-grid{grid-template-columns:1fr;gap:32px;}
  .cta-bar{flex-direction:column;align-items:flex-start;gap:20px;padding:26px 22px;}
  .cta-actions{width:100%;}
  .cta-actions .btn{flex:1 1 auto;}
}
@media (max-width:639px){
  .grid-container{padding-left:20px;padding-right:20px;}
  .sec{padding:48px 0;}
  body{font-size:15px;}
  .category-hero{padding:28px 0 40px;}
  h1.hero-title{font-size:clamp(26px,7.6vw,32px);}
  .hero-actions{gap:10px;}
  .hero-actions .btn{flex:1 1 100%;}
  .stat-item{padding:20px 18px;}
  .feature-body{padding:0;}
  .feature-row{margin-bottom:48px;}
  .sec-head{margin-bottom:32px;}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px;}
}

/* roulang page: category2 */
:root{
  --bg:#060A14;
  --bg-panel:#0B1220;
  --bg-alt:#080E1A;
  --bg-alt2:#0A1424;
  --primary:#1FE0C0;
  --primary-deep:#12A98F;
  --coral:#FF5C46;
  --text:#E8EEF7;
  --text-2:#A9B6C9;
  --text-3:#6E7C90;
  --line:rgba(255,255,255,0.08);
  --line-2:rgba(255,255,255,0.14);
  --glass:linear-gradient(160deg, rgba(255,255,255,0.07), rgba(255,255,255,0.02));
  --r-card:16px;
  --r-sm:10px;
  --r-btn:12px;
  --shadow:0 18px 40px rgba(0,0,0,0.45);
  --shadow-hi:0 26px 56px rgba(0,0,0,0.55), 0 0 0 1px rgba(31,224,192,0.35);
  --font:PingFang SC, HarmonyOS Sans SC, Microsoft YaHei, Noto Sans SC, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --maxw:1200px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--font);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border:0}
a{color:var(--primary);text-decoration:none;transition:color .2s ease-out, opacity .2s ease-out}
a:hover{color:#5cf0d8}
a:focus-visible{outline:2px solid var(--primary);outline-offset:3px;border-radius:4px}
button{font-family:inherit}
h1,h2,h3,h4,h5,h6{margin:0;font-weight:700;color:var(--text);line-height:1.3}
h1{font-size:clamp(30px,4.6vw,48px);line-height:1.2}
h2{font-size:clamp(24px,3.2vw,34px)}
h3{font-size:20px;line-height:1.4;font-weight:600}
h4{font-size:17px;line-height:1.5;font-weight:600}
p{margin:0 0 1.2em}
ul,ol{margin:0;padding:0;list-style:none}
.grid-container{max-width:var(--maxw);margin:0 auto;padding-left:20px;padding-right:20px}
@media screen and (min-width:1024px){
  .grid-container{padding-left:32px;padding-right:32px}
}
.grid-x.gap-24{margin-left:-12px;margin-right:-12px}
.grid-x.gap-24 > .cell{padding-left:12px;padding-right:12px}
.row-gap-24{row-gap:24px}

/* ===== 按钮 ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:11px 22px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;letter-spacing:.01em;border:1px solid transparent;
  cursor:pointer;transition:transform .2s ease-out, box-shadow .2s ease-out, background-color .2s ease-out, color .2s ease-out, border-color .2s ease-out;
}
.btn-primary{
  background:var(--primary);color:#04121A;
  box-shadow:0 0 0 1px rgba(31,224,192,0.5), 0 10px 30px rgba(31,224,192,0.28);
}
.btn-primary:hover{background:#3ae8cb;color:#04121A;transform:translateY(-2px);box-shadow:0 0 0 1px rgba(31,224,192,0.6), 0 14px 36px rgba(31,224,192,0.34)}
.btn-primary:active{transform:translateY(1px);box-shadow:0 0 0 1px rgba(31,224,192,0.45), 0 6px 18px rgba(31,224,192,0.22)}
.btn-ghost{
  background:var(--glass);color:var(--text);border-color:rgba(31,224,192,0.45);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
}
.btn-ghost:hover{background:rgba(31,224,192,0.12);color:#fff;border-color:var(--primary);transform:translateY(-2px)}
.btn-ghost:active{transform:translateY(1px)}
.btn-block{width:100%}
.btn:focus-visible{outline:2px solid var(--primary);outline-offset:2px}

/* ===== 徽章 ===== */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:6px 12px;border-radius:999px;font-size:12px;line-height:1;letter-spacing:.02em;
}
.badge-line{border:1px solid rgba(31,224,192,0.5);color:var(--primary);background:rgba(31,224,192,0.06)}
.badge-coral{background:var(--coral);color:#1A0503;font-weight:600}
.badge-soft{background:rgba(255,255,255,0.06);border:1px solid var(--line);color:var(--text-2)}

/* ===== 导航 ===== */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(6,10,20,0.86);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid var(--line);
  transition:background-color .22s ease-out, box-shadow .22s ease-out;
}
.site-header.is-scrolled{background:rgba(4,8,16,0.96);box-shadow:0 12px 30px rgba(0,0,0,0.5)}
.nav-shell{
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;
  min-height:72px;transition:min-height .22s ease-out;
}
.site-header.is-scrolled .nav-shell{min-height:60px}
.nav-left,.nav-right{display:flex;align-items:center;gap:6px}
.nav-left{justify-self:start}
.nav-right{justify-self:end}
.nav-logo{
  justify-self:center;font-weight:700;font-size:17px;color:var(--text);
  letter-spacing:.01em;white-space:nowrap;position:relative;padding:0 14px;
}
.nav-logo::before,.nav-logo::after{
  content:"";position:absolute;top:50%;transform:translateY(-50%);
  width:5px;height:5px;border-radius:2px;background:var(--primary);
  box-shadow:0 0 10px rgba(31,224,192,0.7);
}
.nav-logo::before{left:0}
.nav-logo::after{right:0}
.nav-logo:hover{color:var(--primary)}
.nav-link{
  position:relative;display:inline-flex;align-items:center;height:44px;padding:0 12px;
  font-size:14.5px;color:var(--text-2);border-radius:var(--r-sm);
  transition:color .2s ease-out, background-color .2s ease-out;
}
.nav-link:hover{color:var(--text);background:rgba(255,255,255,0.05)}
.nav-link.is-active{color:var(--primary)}
.nav-link.is-active::after{
  content:"";position:absolute;left:12px;right:12px;bottom:6px;height:2px;
  background:var(--primary);border-radius:2px;box-shadow:0 0 10px rgba(31,224,192,0.6);
}
.nav-cta{margin-left:10px;padding:9px 18px;min-height:40px;font-size:14px}
.nav-toggle{
  display:none;width:44px;height:44px;margin-left:8px;border-radius:var(--r-sm);
  background:var(--glass);border:1px solid var(--line);color:var(--text);cursor:pointer;
  align-items:center;justify-content:center;font-size:17px;
  transition:border-color .2s ease-out, background-color .2s ease-out, color .2s ease-out;
}
.nav-toggle:hover{border-color:rgba(31,224,192,0.55);color:var(--primary);background:rgba(31,224,192,0.1)}
.nav-toggle:focus-visible{outline:2px solid var(--primary);outline-offset:2px}

.mobile-drawer{
  display:none;border-top:1px solid var(--line);
  background:rgba(6,10,20,0.98);padding:8px 0 18px;
}
.mobile-drawer.is-open{display:block;animation:drawerIn .22s ease-out}
@keyframes drawerIn{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}
.drawer-link{
  display:flex;align-items:center;justify-content:space-between;
  min-height:48px;padding:0 20px;color:var(--text-2);font-size:15px;
  border-bottom:1px solid rgba(255,255,255,0.05);
  transition:color .2s ease-out, background-color .2s ease-out;
}
.drawer-link:hover{color:var(--primary);background:rgba(31,224,192,0.07)}
.drawer-link.is-active{color:var(--primary)}
.drawer-link i{font-size:12px;color:var(--text-3)}
.drawer-cta-wrap{padding:16px 20px 0}

/* ===== 面包屑 ===== */
.breadcrumb{padding:22px 0 0;font-size:13px;color:var(--text-3)}
.breadcrumb a{color:var(--text-2)}
.breadcrumb a:hover{color:var(--primary)}
.breadcrumb span.sep{margin:0 8px;color:var(--text-3)}
.breadcrumb .current{color:var(--primary)}

/* ===== 分类 Hero ===== */
.cat-hero{
  position:relative;overflow:hidden;
  background:linear-gradient(180deg,#070C18 0%, #060A14 100%);
  border-bottom:1px solid var(--line);
}
.cat-hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(640px 340px at 8% 100%, rgba(31,224,192,0.13), transparent 72%),
    radial-gradient(520px 300px at 96% 92%, rgba(255,92,70,0.09), transparent 72%),
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size:auto,auto,32px 32px,32px 32px;
  mask-image:linear-gradient(180deg, rgba(0,0,0,0.85), rgba(0,0,0,0.25));
  -webkit-mask-image:linear-gradient(180deg, rgba(0,0,0,0.85), rgba(0,0,0,0.25));
}
.cat-hero-inner{
  position:relative;z-index:1;
  display:grid;grid-template-columns:1.15fr 1fr;gap:48px;align-items:center;
  padding:44px 0 52px;min-height:320px;
}
.cat-hero-text h1{margin:16px 0 14px;max-width:620px}
.cat-hero-text .lead{
  color:var(--text-2);font-size:16px;line-height:1.8;max-width:600px;margin-bottom:24px;
}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px}
.cat-hero-media{
  position:relative;border-radius:20px;overflow:hidden;
  border:1px solid var(--line-2);box-shadow:var(--shadow);aspect-ratio:16/10;
  background:linear-gradient(160deg, rgba(255,255,255,0.06), rgba(255,255,255,0.01));
}
.cat-hero-media img{width:100%;height:100%;object-fit:cover}
.cat-hero-media::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(200deg, rgba(31,224,192,0.22), rgba(6,10,20,0) 58%);
}
.hero-float{
  position:absolute;right:16px;bottom:16px;z-index:2;
  padding:12px 16px;border-radius:14px;
  background:linear-gradient(160deg, rgba(255,255,255,0.12), rgba(255,255,255,0.04));
  border:1px solid rgba(255,255,255,0.14);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
}
.hero-float strong{display:block;font-size:20px;color:var(--primary);line-height:1.2}
.hero-float span{font-size:12px;color:var(--text-2);letter-spacing:.02em}

/* ===== 数据条 ===== */
.stat-strip{
  display:grid;grid-template-columns:repeat(4,1fr);
  background:var(--bg-panel);border:1px solid var(--line);border-radius:var(--r-card);
  margin-top:-28px;position:relative;z-index:3;overflow:hidden;
  box-shadow:var(--shadow);
}
.stat-item{padding:22px 24px;border-right:1px solid var(--line);transition:background-color .22s ease-out}
.stat-item:last-child{border-right:0}
.stat-item:hover{background:rgba(31,224,192,0.05)}
.stat-item strong{display:block;font-size:24px;font-weight:700;color:var(--primary);line-height:1.25}
.stat-item span{font-size:13px;color:var(--text-3);letter-spacing:.02em}

/* ===== 板块通用 ===== */
.section{padding:96px 0}
.section-alt{background:var(--bg-alt)}
.section-alt2{background:var(--bg-alt2)}
.section-head{max-width:780px;margin-bottom:44px}
.sec-index{
  display:inline-flex;align-items:center;gap:10px;
  font-size:13px;color:var(--primary);letter-spacing:.16em;margin-bottom:14px;
}
.sec-index::before{content:"";width:2px;height:18px;background:var(--primary);border-radius:2px;box-shadow:0 0 10px rgba(31,224,192,0.6)}
.sec-title{margin-bottom:14px}
.sec-desc{color:var(--text-2);font-size:15.5px;line-height:1.8;margin:0;max-width:760px}

/* ===== 时间轴 ===== */
.timeline{position:relative;padding-left:0}
.timeline::before{
  content:"";position:absolute;left:27px;top:14px;bottom:14px;width:1px;
  background:linear-gradient(180deg, rgba(255,255,255,0.16), rgba(255,255,255,0.05));
}
.tl-item{display:grid;grid-template-columns:56px 1fr;column-gap:24px;position:relative;padding-bottom:28px}
.tl-item:last-child{padding-bottom:0}
.tl-marker{position:relative;display:flex;justify-content:center;padding-top:26px}
.tl-dot{
  width:16px;height:16px;border-radius:50%;background:var(--primary);
  box-shadow:0 0 0 5px rgba(31,224,192,0.12), 0 0 20px rgba(31,224,192,0.6);
  transition:box-shadow .22s ease-out, transform .22s ease-out;
}
.tl-item:hover .tl-dot{transform:scale(1.12);box-shadow:0 0 0 7px rgba(31,224,192,0.16), 0 0 26px rgba(31,224,192,0.75)}
.tl-body{
  background:var(--glass);border:1px solid var(--line);border-radius:var(--r-card);
  padding:26px 28px;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  box-shadow:var(--shadow);
  transition:transform .22s ease-out, box-shadow .22s ease-out, border-color .22s ease-out;
}
.tl-body:hover{transform:translateY(-4px);box-shadow:var(--shadow-hi);border-color:rgba(31,224,192,0.35)}
.tl-num{
  font-size:26px;font-weight:700;color:rgba(31,224,192,0.9);
  letter-spacing:.04em;line-height:1;display:block;margin-bottom:8px;
}
.tl-title{margin-bottom:10px}
.tl-text{color:var(--text-2);font-size:15px;line-height:1.8;margin:0 0 16px}
.tl-points{display:grid;gap:8px}
.tl-points li{
  position:relative;padding-left:20px;font-size:14px;color:var(--text-2);line-height:1.7;
}
.tl-points li::before{
  content:"";position:absolute;left:0;top:9px;width:6px;height:6px;border-radius:2px;
  background:var(--primary-deep);
}

/* ===== 图文准备区 ===== */
.prep-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.prep-media{
  position:relative;border-radius:var(--r-card);overflow:hidden;
  border:1px solid var(--line-2);box-shadow:var(--shadow);aspect-ratio:4/3;
}
.prep-media img{width:100%;height:100%;object-fit:cover}
.prep-media::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg, rgba(6,10,20,0) 40%, rgba(6,10,20,0.62) 100%);
}
.prep-list{display:grid;gap:16px;margin-top:22px}
.prep-list li{
  display:grid;grid-template-columns:38px 1fr;gap:14px;align-items:start;
  padding:16px 18px;border-radius:14px;background:rgba(255,255,255,0.035);
  border:1px solid var(--line);
  transition:border-color .22s ease-out, background-color .22s ease-out, transform .22s ease-out;
}
.prep-list li:hover{border-color:rgba(31,224,192,0.35);background:rgba(31,224,192,0.06);transform:translateX(4px)}
.prep-ico{
  width:38px;height:38px;border-radius:11px;display:flex;align-items:center;justify-content:center;
  background:rgba(31,224,192,0.1);border:1px solid rgba(31,224,192,0.32);color:var(--primary);font-size:15px;
}
.prep-list h4{margin-bottom:4px}
.prep-list p{margin:0;color:var(--text-2);font-size:14px;line-height:1.7}

/* ===== 设备卡片 ===== */
.device-card{
  height:100%;display:flex;flex-direction:column;
  background:var(--glass);border:1px solid var(--line);border-radius:var(--r-card);
  overflow:hidden;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  transition:transform .22s ease-out, box-shadow .22s ease-out, border-color .22s ease-out;
}
.device-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hi);border-color:rgba(31,224,192,0.35)}
.thumb{position:relative;aspect-ratio:16/9;overflow:hidden;background:rgba(255,255,255,0.04)}
.thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease-out}
.device-card:hover .thumb img{transform:scale(1.04)}
.thumb::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg, rgba(6,10,20,0) 55%, rgba(6,10,20,0.75) 100%)}
.device-card-body{padding:22px 24px 26px;display:flex;flex-direction:column;gap:10px;flex:1}
.device-card-body h3{margin:0}
.device-card-body p{margin:0;color:var(--text-2);font-size:14.5px;line-height:1.75}
.device-meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:auto;padding-top:14px;border-top:1px solid var(--line)}

/* ===== FAQ ===== */
.faq-list{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.faq-item{
  border-radius:var(--r-card);border:1px solid var(--line);
  background:var(--glass);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  overflow:hidden;transition:border-color .22s ease-out, box-shadow .22s ease-out;
}
.faq-item:hover{border-color:rgba(31,224,192,0.3)}
.faq-item[open]{border-color:rgba(31,224,192,0.5);box-shadow:0 0 0 1px rgba(31,224,192,0.16), var(--shadow)}
.faq-item summary{
  list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:20px 22px;font-size:16px;font-weight:600;color:var(--text);
  transition:color .2s ease-out;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary:hover{color:var(--primary)}
.faq-item summary:focus-visible{outline:2px solid var(--primary);outline-offset:-3px}
.faq-item summary .fa-plus{
  flex:0 0 auto;color:var(--primary);font-size:14px;
  transition:transform .22s ease-out;
}
.faq-item[open] summary .fa-plus{transform:rotate(45deg)}
.faq-body{padding:0 22px 22px;color:var(--text-2);font-size:15px;line-height:1.8;border-top:1px solid var(--line);padding-top:16px}
.faq-body p{margin:0}

/* ===== 相关分类 ===== */
.rel-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.rel-link{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:20px 22px;border-radius:14px;
  background:rgba(255,255,255,0.035);border:1px solid var(--line);
  color:var(--text);font-size:15px;font-weight:600;
  transition:transform .22s ease-out, border-color .22s ease-out, background-color .22s ease-out, color .22s ease-out;
}
.rel-link span.arrow{color:var(--text-3);transition:transform .22s ease-out, color .22s ease-out}
.rel-link:hover{transform:translateY(-4px);border-color:rgba(31,224,192,0.45);background:rgba(31,224,192,0.08);color:var(--primary)}
.rel-link:hover span.arrow{color:var(--primary);transform:translateX(6px)}
.rel-link:active{transform:translateY(-1px)}

/* ===== CTA 条 ===== */
.cta-bar{
  display:flex;align-items:center;justify-content:space-between;gap:28px;
  padding:30px 34px;border-radius:20px;
  background:linear-gradient(160deg, rgba(31,224,192,0.12), rgba(255,255,255,0.03));
  border:1px solid rgba(31,224,192,0.28);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  box-shadow:var(--shadow);
}
.cta-bar h3{margin-bottom:6px}
.cta-bar p{margin:0;color:var(--text-2);font-size:14.5px}
.cta-actions{display:flex;gap:12px;flex-wrap:wrap}

/* ===== 页脚 ===== */
.site-footer{
  position:relative;overflow:hidden;
  background:linear-gradient(180deg, #070C18, #050810);
  border-top:1px solid var(--line);
  padding:72px 0 0;margin-top:0;
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(560px 300px at 6% 100%, rgba(31,224,192,0.12), transparent 72%),
    radial-gradient(480px 280px at 94% 100%, rgba(255,92,70,0.08), transparent 72%);
}
.footer-grid{
  position:relative;z-index:1;
  display:grid;grid-template-columns:1.4fr 1fr 1fr 1.3fr;gap:40px;
  padding-bottom:52px;
}
.footer-brand-name{display:inline-block;font-size:17px;font-weight:700;color:var(--text);margin-bottom:14px}
.footer-brand-name:hover{color:var(--primary)}
.footer-brand p{color:var(--text-2);font-size:14px;line-height:1.8;margin:0;max-width:300px}
.footer-col h4{margin-bottom:16px;font-size:15px;color:var(--text)}
.footer-links{display:grid;gap:10px}
.footer-links a{
  position:relative;display:inline-block;padding-left:0;
  color:var(--text-2);font-size:14px;
  transition:color .2s ease-out, padding-left .2s ease-out;
}
.footer-links a::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:2px;height:0;background:var(--primary);border-radius:2px;
  transition:height .2s ease-out;
}
.footer-links a:hover{color:var(--primary);padding-left:12px}
.footer-links a:hover::before{height:14px}
.sub-form{display:grid;gap:10px}
.sub-form label{font-size:13.5px;color:var(--text-2);line-height:1.6}
.sub-form input[type="email"]{
  width:100%;min-height:44px;padding:11px 14px;border-radius:var(--r-sm);
  background:rgba(255,255,255,0.04);border:1px solid var(--line);
  color:var(--text);font-size:14.5px;font-family:inherit;
  transition:border-color .2s ease-out, box-shadow .2s ease-out, background-color .2s ease-out;
}
.sub-form input[type="email"]::placeholder{color:var(--text-3)}
.sub-form input[type="email"]:focus{
  outline:none;border-color:var(--primary);background:rgba(31,224,192,0.06);
  box-shadow:0 0 0 3px rgba(31,224,192,0.18);
}
.sub-form input.error{border-color:var(--coral);box-shadow:0 0 0 3px rgba(255,92,70,0.16)}
.form-note{font-size:12.5px;color:var(--text-3);line-height:1.6}
.form-note.error-text{color:var(--coral)}
.footer-bottom{
  position:relative;z-index:1;
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;
  padding:22px 0 28px;border-top:1px solid var(--line);
  font-size:13px;color:var(--text-3);
}

/* ===== 响应式 ===== */
@media screen and (max-width:1023px){
  .nav-left,.nav-right .nav-link,.nav-cta{display:none}
  .nav-toggle{display:inline-flex}
  .nav-shell{grid-template-columns:1fr auto 1fr}
  .nav-left{gap:0}
  .cat-hero-inner{grid-template-columns:1fr;gap:28px;padding:34px 0 40px;min-height:0}
  .cat-hero-text h1{margin:12px 0 12px}
  .stat-strip{grid-template-columns:repeat(2,1fr);margin-top:-20px}
  .stat-item:nth-child(2){border-right:0}
  .stat-item:nth-child(1),.stat-item:nth-child(2){border-bottom:1px solid var(--line)}
  .prep-grid{grid-template-columns:1fr;gap:32px}
  .rel-grid{grid-template-columns:repeat(2,1fr)}
  .faq-list{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .section{padding:64px 0}
}
@media screen and (max-width:767px){
  body{font-size:15.5px}
  .nav-logo{font-size:15px;padding:0 12px}
  .section{padding:48px 0}
  .section-head{margin-bottom:28px}
  .tl-item{grid-template-columns:34px 1fr;column-gap:14px}
  .timeline::before{left:16px}
  .tl-marker{padding-top:22px}
  .tl-dot{width:13px;height:13px}
  .tl-body{padding:20px 18px}
  .tl-num{font-size:22px}
  .cta-bar{flex-direction:column;align-items:flex-start;padding:24px 20px}
  .cta-actions{width:100%}
  .cta-actions .btn{flex:1}
  .hero-actions .btn{width:100%}
  .rel-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-bottom{flex-direction:column;gap:6px}
}
@media screen and (max-width:519px){
  .stat-strip{grid-template-columns:1fr}
  .stat-item{border-right:0;border-bottom:1px solid var(--line)}
  .stat-item:last-child{border-bottom:0}
  .device-card-body{padding:18px 18px 22px}
}

/* roulang page: category3 */
:root{
  --bg:#060A14;
  --panel:#0B1220;
  --bg-alt-1:#080E1A;
  --bg-alt-2:#0A1424;
  --brand:#1FE0C0;
  --brand-deep:#12A98F;
  --coral:#FF5C46;
  --t1:#E8EEF7;
  --t2:#A9B6C9;
  --t3:#6E7C90;
  --line:rgba(255,255,255,0.08);
  --line-soft:rgba(255,255,255,0.07);
  --glass:linear-gradient(160deg,rgba(255,255,255,0.07),rgba(255,255,255,0.02));
  --r-card:16px;
  --r-ctrl:10px;
  --r-btn:12px;
  --sh-card:0 18px 40px rgba(0,0,0,0.45);
  --sh-hover:0 26px 56px rgba(0,0,0,0.55),0 0 0 1px rgba(31,224,192,0.35);
  --ease:220ms cubic-bezier(.2,.7,.3,1);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--t2);
  font-family:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4,p,ul,ol,figure{margin:0}
ul,ol{padding:0;list-style:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
input{font:inherit}
:focus-visible{outline:2px solid var(--brand);outline-offset:3px;border-radius:4px}
::selection{background:rgba(31,224,192,.28);color:#04121A}

.grid-container{max-width:1200px;margin:0 auto;padding-left:20px;padding-right:20px}
@media (min-width:1024px){
  .grid-container{padding-left:32px;padding-right:32px}
}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(8,14,26,.86);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line-soft);
  transition:background var(--ease),border-color var(--ease);
}
.site-header.is-scrolled{background:rgba(6,10,20,.96);box-shadow:0 10px 30px rgba(0,0,0,.4)}
.nav-wrap{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  min-height:72px;transition:min-height var(--ease);
}
.site-header.is-scrolled .nav-wrap{min-height:60px}
.nav-left,.nav-right{display:flex;align-items:center;gap:6px;flex:1 1 0}
.nav-right{justify-content:flex-end}
.nav-link{
  position:relative;display:inline-flex;align-items:center;
  padding:10px 12px;border-radius:var(--r-ctrl);
  font-size:14.5px;font-weight:500;color:var(--t2);
  transition:color var(--ease),background var(--ease);
  white-space:nowrap;
}
.nav-link::after{
  content:"";position:absolute;left:12px;right:12px;bottom:4px;height:2px;
  background:var(--brand);border-radius:2px;transform:scaleX(0);transform-origin:left;
  transition:transform var(--ease);
}
.nav-link:hover{color:var(--t1);background:rgba(255,255,255,.04)}
.nav-link:hover::after,.nav-link.is-active::after{transform:scaleX(1)}
.nav-link.is-active{color:var(--brand)}
.site-brand{
  display:inline-flex;align-items:center;gap:10px;flex:0 0 auto;
  padding:8px 14px;border-radius:var(--r-btn);
  font-size:17px;font-weight:700;color:var(--t1);letter-spacing:.01em;
  transition:color var(--ease),background var(--ease);
}
.site-brand:hover{color:var(--brand);background:rgba(31,224,192,.07)}
.brand-dot{
  width:10px;height:10px;border-radius:3px;background:var(--brand);
  box-shadow:0 0 14px rgba(31,224,192,.7);flex:0 0 auto;
}
.brand-name{white-space:nowrap}
@media (max-width:1279px){
  .brand-name{font-size:15px}
  .nav-link{font-size:13.5px;padding:9px 9px}
}
.nav-toggle{
  display:none;width:44px;height:44px;border-radius:var(--r-ctrl);
  border:1px solid var(--line);align-items:center;justify-content:center;flex-direction:column;gap:4px;
  transition:border-color var(--ease),background var(--ease);
}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--t1);border-radius:2px;transition:transform var(--ease),opacity var(--ease)}
.nav-toggle:hover{border-color:rgba(31,224,192,.5);background:rgba(31,224,192,.08)}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.mobile-drawer{
  display:none;border-top:1px solid var(--line-soft);
  background:rgba(6,10,20,.98);padding:12px 0 20px;
}
.mobile-drawer.is-open{display:block}
.drawer-link{
  display:flex;align-items:center;justify-content:space-between;
  min-height:48px;padding:0 20px;font-size:15px;color:var(--t1);
  border-bottom:1px solid var(--line-soft);
  transition:background var(--ease),color var(--ease);
}
.drawer-link:hover,.drawer-link.is-active{background:rgba(31,224,192,.09);color:var(--brand)}
.drawer-link .arrow{color:var(--t3);transition:transform var(--ease),color var(--ease)}
.drawer-link:hover .arrow{transform:translateX(4px);color:var(--brand)}
.drawer-foot{padding:16px 20px 0}

@media (max-width:1023px){
  .nav-left,.nav-right{display:none}
  .nav-toggle{display:flex}
  .nav-wrap{min-height:64px}
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:0 20px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;letter-spacing:.02em;
  border:1px solid transparent;cursor:pointer;
  transition:transform var(--ease),box-shadow var(--ease),background var(--ease),color var(--ease),border-color var(--ease);
}
.btn-primary{
  background:var(--brand);color:#04121A;
  box-shadow:0 0 0 1px rgba(31,224,192,.5),0 10px 30px rgba(31,224,192,.28);
}
.btn-primary:hover{filter:brightness(1.08);box-shadow:0 0 0 1px rgba(31,224,192,.6),0 14px 36px rgba(31,224,192,.4);transform:translateY(-2px)}
.btn-primary:active{transform:translateY(-1px);box-shadow:0 0 0 1px rgba(31,224,192,.55),0 8px 20px rgba(31,224,192,.28)}
.btn-ghost{
  background:var(--glass);border-color:rgba(31,224,192,.45);color:var(--t1);
  backdrop-filter:blur(10px);
}
.btn-ghost:hover{background:rgba(31,224,192,.14);border-color:var(--brand);transform:translateY(-2px)}
.btn-ghost:active{transform:translateY(-1px)}
.btn-sm{min-height:40px;padding:0 16px;font-size:14px}
.btn-block{width:100%}

/* ---------- badges ---------- */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;border-radius:999px;
  font-size:12px;font-weight:600;letter-spacing:.04em;line-height:1.6;
}
.badge-brand{color:var(--brand);border:1px solid rgba(31,224,192,.5);background:rgba(31,224,192,.08)}
.badge-coral{color:#2A0B06;background:var(--coral);border:1px solid var(--coral)}
.badge-plain{color:var(--t2);border:1px solid var(--line);background:rgba(255,255,255,.03)}

/* ---------- page hero ---------- */
.page-hero{
  position:relative;overflow:hidden;
  background:var(--bg-alt-1);
  border-bottom:1px solid var(--line-soft);
  padding:28px 0 56px;
}
.page-hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);
  background-size:32px 32px;
  mask-image:radial-gradient(circle at 30% 20%,#000 0%,transparent 72%);
  -webkit-mask-image:radial-gradient(circle at 30% 20%,#000 0%,transparent 72%);
}
.page-hero::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(420px 260px at 12% 8%,rgba(31,224,192,.12),transparent 70%),
    radial-gradient(380px 240px at 92% 92%,rgba(255,92,70,.08),transparent 72%);
}
.page-hero .grid-container{position:relative;z-index:2}
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-size:13px;letter-spacing:.04em;color:var(--t3);margin-bottom:20px;
}
.breadcrumb a{color:var(--t2);transition:color var(--ease)}
.breadcrumb a:hover{color:var(--brand)}
.breadcrumb .sep{opacity:.5}
.breadcrumb .current{color:var(--t1)}
.hero-grid{
  display:grid;grid-template-columns:1.2fr .8fr;gap:40px;align-items:center;
}
.hero-copy .badge{margin-bottom:16px}
.page-hero h1{
  font-size:clamp(30px,4.6vw,46px);line-height:1.2;font-weight:700;color:var(--t1);
  letter-spacing:.005em;
}
.hero-lead{
  margin-top:16px;max-width:640px;font-size:16.5px;line-height:1.8;color:var(--t2);
}
.hero-points{
  display:flex;flex-wrap:wrap;gap:10px 22px;margin-top:22px;
}
.hero-points li{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--t2)}
.hero-points li::before{
  content:"";width:7px;height:7px;border-radius:2px;background:var(--brand);
  box-shadow:0 0 10px rgba(31,224,192,.8);flex:0 0 auto;
}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.hero-media{position:relative}
.hero-media img{
  width:100%;aspect-ratio:16/10;object-fit:cover;
  border-radius:16px;border:1px solid var(--line);
  box-shadow:0 22px 50px rgba(0,0,0,.5);
}
.hero-media::after{
  content:"";position:absolute;inset:0;border-radius:16px;pointer-events:none;
  background:linear-gradient(190deg,rgba(31,224,192,.16),transparent 55%);
}
.hero-float{
  position:absolute;right:14px;bottom:14px;
  padding:12px 16px;border-radius:14px;
  background:var(--glass);border:1px solid rgba(255,255,255,.14);
  backdrop-filter:blur(14px);box-shadow:0 14px 30px rgba(0,0,0,.4);
}
.hero-float b{display:block;font-size:20px;color:var(--brand);line-height:1.2}
.hero-float span{font-size:12px;color:var(--t2);letter-spacing:.04em}

@media (max-width:1023px){
  .hero-grid{grid-template-columns:1fr;gap:28px}
  .page-hero{padding:22px 0 44px}
  .hero-media{order:-1}
}
@media (max-width:639px){
  .page-hero{padding:18px 0 36px}
  .hero-lead{font-size:15.5px}
}

/* ---------- sections ---------- */
.section{padding:96px 0;position:relative}
.section-tint{background:var(--bg-alt-2);border-top:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft)}
.section-panel{background:var(--panel)}
.section-head{max-width:760px;margin-bottom:44px}
.sec-num{
  display:inline-flex;align-items:baseline;gap:10px;
  font-size:13px;letter-spacing:.24em;color:var(--brand);margin-bottom:12px;
}
.sec-num::before{content:"";width:2px;height:16px;background:var(--brand);border-radius:2px;transform:translateY(2px)}
.section-title{font-size:clamp(24px,3.2vw,34px);line-height:1.3;font-weight:700;color:var(--t1)}
.section-desc{margin-top:14px;font-size:15.5px;color:var(--t2);max-width:720px}

@media (max-width:1023px){
  .section{padding:64px 0}
  .section-head{margin-bottom:32px}
}
@media (max-width:639px){
  .section{padding:48px 0}
}

/* ---------- stat strip ---------- */
.stat-strip{
  display:grid;grid-template-columns:repeat(4,1fr);gap:1px;
  background:var(--line-soft);border:1px solid var(--line-soft);
  border-radius:var(--r-card);overflow:hidden;
}
.stat-item{background:var(--bg-alt-1);padding:24px 22px;transition:background var(--ease)}
.stat-item:hover{background:rgba(31,224,192,.06)}
.stat-num{font-size:26px;font-weight:700;color:var(--brand);line-height:1.2}
.stat-label{margin-top:8px;font-size:13.5px;color:var(--t2);line-height:1.6}
@media (max-width:1023px){
  .stat-strip{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:479px){
  .stat-strip{grid-template-columns:1fr}
}

/* ---------- card grid (2 columns, unified height) ---------- */
.card-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.topic-card{
  display:flex;flex-direction:column;height:100%;
  background:var(--glass);border:1px solid rgba(255,255,255,.09);
  border-radius:var(--r-card);overflow:hidden;
  backdrop-filter:blur(14px);box-shadow:var(--sh-card);
  transition:transform var(--ease),box-shadow var(--ease),border-color var(--ease);
}
.topic-card:hover{transform:translateY(-4px);box-shadow:var(--sh-hover);border-color:rgba(31,224,192,.35)}
.card-media{position:relative;aspect-ratio:16/9;overflow:hidden;background:rgba(255,255,255,.03)}
.card-media img{width:100%;height:100%;object-fit:cover;transition:transform 240ms ease-out}
.topic-card:hover .card-media img{transform:scale(1.05)}
.card-media::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(6,10,20,0) 40%,rgba(6,10,20,.72) 100%);
}
.card-media .badge{position:absolute;left:14px;top:14px;z-index:2;backdrop-filter:blur(8px)}
.card-body{padding:22px 22px 24px;display:flex;flex-direction:column;flex:1 1 auto}
.card-title{font-size:19px;font-weight:600;color:var(--t1);line-height:1.45}
.card-text{margin-top:10px;font-size:14px;line-height:1.75;color:var(--t2);flex:1 1 auto}
.card-foot{
  margin-top:18px;padding-top:16px;border-top:1px solid var(--line-soft);
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  font-size:13px;color:var(--t3);
}
.card-link{display:inline-flex;align-items:center;gap:6px;font-weight:600;color:var(--brand)}
.card-link .arw{transition:transform var(--ease)}
.topic-card:hover .card-link .arw{transform:translateX(5px)}
@media (max-width:767px){
  .card-grid{grid-template-columns:1fr;gap:20px}
}

/* ---------- steps ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.step{
  position:relative;padding:24px 20px;
  background:rgba(255,255,255,.03);border:1px solid var(--line);
  border-radius:var(--r-card);transition:border-color var(--ease),transform var(--ease),background var(--ease);
}
.step:hover{border-color:rgba(31,224,192,.4);transform:translateY(-3px);background:rgba(31,224,192,.05)}
.step-index{
  display:inline-flex;align-items:center;justify-content:center;
  width:36px;height:36px;border-radius:var(--r-ctrl);
  background:rgba(31,224,192,.12);color:var(--brand);
  font-size:14px;font-weight:700;letter-spacing:.06em;
  border:1px solid rgba(31,224,192,.35);
}
.step-title{margin-top:16px;font-size:17px;font-weight:600;color:var(--t1);line-height:1.5}
.step-text{margin-top:10px;font-size:14px;line-height:1.75;color:var(--t2)}
@media (max-width:1023px){
  .steps{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:519px){
  .steps{grid-template-columns:1fr}
}

/* ---------- faq ---------- */
.faq-list{display:grid;gap:14px}
.faq-item{
  background:var(--glass);border:1px solid rgba(255,255,255,.09);
  border-radius:var(--r-card);backdrop-filter:blur(12px);
  transition:border-color var(--ease),background var(--ease);
}
.faq-item:hover{border-color:rgba(31,224,192,.34)}
.faq-item[open]{border-color:rgba(31,224,192,.5);background:rgba(31,224,192,.05)}
.faq-q{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:20px 22px;font-size:16px;font-weight:600;color:var(--t1);
  cursor:pointer;list-style:none;
}
.faq-q::-webkit-details-marker{display:none}
.faq-icon{position:relative;flex:0 0 18px;width:18px;height:18px;transition:transform var(--ease)}
.faq-icon::before,.faq-icon::after{
  content:"";position:absolute;left:50%;top:50%;background:var(--brand);border-radius:2px;
  transform:translate(-50%,-50%);
}
.faq-icon::before{width:16px;height:2px}
.faq-icon::after{width:2px;height:16px}
.faq-item[open] .faq-icon{transform:rotate(45deg)}
.faq-a{padding:0 22px 22px;font-size:15px;line-height:1.85;color:var(--t2)}
.faq-a p+p{margin-top:10px}

/* ---------- cta bar ---------- */
.cta-bar{
  display:flex;align-items:center;justify-content:space-between;gap:24px;
  padding:28px 32px;border-radius:20px;
  background:var(--glass);border:1px solid rgba(31,224,192,.32);
  backdrop-filter:blur(14px);box-shadow:var(--sh-card);
}
.cta-text h2{font-size:22px;font-weight:700;color:var(--t1);line-height:1.4}
.cta-text p{margin-top:8px;font-size:14.5px;color:var(--t2)}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px;flex:0 0 auto}
@media (max-width:767px){
  .cta-bar{flex-direction:column;align-items:stretch;padding:24px 20px}
  .cta-actions{flex-direction:column}
  .cta-actions .btn{width:100%}
}

/* ---------- related ---------- */
.related-list{display:flex;flex-wrap:wrap;gap:12px}
.related-link{
  display:inline-flex;align-items:center;gap:10px;
  padding:14px 20px;border-radius:var(--r-btn);
  background:rgba(255,255,255,.03);border:1px solid var(--line);
  font-size:14.5px;font-weight:500;color:var(--t1);
  transition:border-color var(--ease),background var(--ease),transform var(--ease),color var(--ease);
}
.related-link:hover{border-color:rgba(31,224,192,.5);background:rgba(31,224,192,.09);color:var(--brand);transform:translateY(-2px)}
.related-link .arw{color:var(--t3);transition:transform var(--ease),color var(--ease)}
.related-link:hover .arw{transform:translateX(4px);color:var(--brand)}

/* ---------- footer ---------- */
.site-footer{
  position:relative;overflow:hidden;
  background:var(--bg-alt-1);
  border-top:1px solid var(--line-soft);
  padding:64px 0 28px;
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(360px 220px at 8% 100%,rgba(31,224,192,.12),transparent 70%),
    radial-gradient(320px 200px at 90% 100%,rgba(255,92,70,.08),transparent 72%);
}
.footer-grid{
  position:relative;z-index:2;
  display:grid;grid-template-columns:1.4fr 1fr 1fr 1.4fr;gap:32px;
}
.footer-brand-name{
  display:inline-flex;align-items:center;gap:10px;
  font-size:17px;font-weight:700;color:var(--t1);
  transition:color var(--ease);
}
.footer-brand-name::before{
  content:"";width:10px;height:10px;border-radius:3px;background:var(--brand);
  box-shadow:0 0 14px rgba(31,224,192,.7);
}
.footer-brand-name:hover{color:var(--brand)}
.footer-brand p{margin-top:14px;font-size:14px;line-height:1.8;color:var(--t2);max-width:320px}
.footer-col h4{font-size:14px;font-weight:600;color:var(--t1);letter-spacing:.06em;margin-bottom:16px}
.footer-links li+li{margin-top:10px}
.footer-links a{
  position:relative;display:inline-block;padding-left:0;
  font-size:14px;color:var(--t2);
  transition:color var(--ease),padding-left var(--ease);
}
.footer-links a::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%) scaleY(0);
  width:2px;height:14px;background:var(--brand);border-radius:2px;
  transition:transform var(--ease);
}
.footer-links a:hover{color:var(--brand);padding-left:12px}
.footer-links a:hover::before{transform:translateY(-50%) scaleY(1)}
.sub-form label{display:block;font-size:13.5px;color:var(--t2);margin-bottom:10px;line-height:1.7}
.sub-form input{
  width:100%;min-height:44px;padding:0 14px;border-radius:var(--r-ctrl);
  background:rgba(255,255,255,.04);border:1px solid var(--line);color:var(--t1);
  transition:border-color var(--ease),box-shadow var(--ease),background var(--ease);
}
.sub-form input::placeholder{color:var(--t3)}
.sub-form input:focus{
  outline:none;border-color:var(--brand);background:rgba(31,224,192,.06);
  box-shadow:0 0 0 3px rgba(31,224,192,.18);
}
.sub-form input.is-error{border-color:var(--coral);box-shadow:0 0 0 3px rgba(255,92,70,.16)}
.form-note{display:block;margin:10px 0 14px;font-size:12.5px;color:var(--t3);line-height:1.7}
.form-note.is-error{color:var(--coral)}
.form-note.is-ok{color:var(--brand)}
.footer-bottom{
  position:relative;z-index:2;margin-top:48px;padding-top:20px;
  border-top:1px solid var(--line-soft);
  display:flex;flex-wrap:wrap;gap:10px 24px;justify-content:space-between;
  font-size:13px;color:var(--t3);letter-spacing:.03em;
}
@media (max-width:1023px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .site-footer{padding:48px 0 24px}
}
@media (max-width:639px){
  .footer-grid{grid-template-columns:1fr}
}

/* roulang page: category4 */
:root{
  --bg:#060A14;
  --bg-2:#080E1A;
  --bg-3:#0A1424;
  --panel:#0B1220;
  --line:rgba(255,255,255,.08);
  --line-soft:rgba(255,255,255,.07);
  --primary:#1FE0C0;
  --primary-deep:#12A98F;
  --coral:#FF5C46;
  --text:#E8EEF7;
  --text-2:#A9B6C9;
  --text-3:#6E7C90;
  --r-lg:16px;
  --r-md:12px;
  --r-sm:10px;
  --shadow-1:0 18px 40px rgba(0,0,0,.45);
  --shadow-2:0 26px 56px rgba(0,0,0,.55);
  --ease:200ms ease-out;
  --font:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--text-2);
  font-family:var(--font);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;border:0;}
a{color:inherit;text-decoration:none;transition:color var(--ease),opacity var(--ease);}
button,input{font-family:inherit;font-size:inherit;}
h1,h2,h3,h4{color:var(--text);margin:0;font-weight:700;letter-spacing:.01em;}
p{margin:0;}
ul{margin:0;padding:0;list-style:none;}

.grid-container{max-width:1200px;padding-left:20px;padding-right:20px;}
@media screen and (min-width:1024px){
  .grid-container{padding-left:32px;padding-right:32px;}
}

/* ============ 导航 ============ */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(6,10,20,.82);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;
  transition:background var(--ease),border-color var(--ease);
}
.site-header.is-shrink{
  background:rgba(6,10,20,.96);
  border-bottom-color:var(--line-soft);
}
.nav-shell{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  height:72px;
  transition:height var(--ease);
}
.site-header.is-shrink .nav-shell{height:60px;}

.nav-left{display:flex;align-items:center;gap:6px;justify-self:start;}
.nav-right{display:flex;align-items:center;gap:10px;justify-self:end;}
.nav-right-links{display:flex;align-items:center;gap:6px;}

.nav-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  height:44px;
  padding:0 12px;
  font-size:14px;
  color:var(--text-2);
  border-radius:var(--r-sm);
  white-space:nowrap;
}
.nav-link::after{
  content:"";
  position:absolute;
  left:12px;
  right:12px;
  bottom:6px;
  height:2px;
  border-radius:2px;
  background:var(--primary);
  transform:scaleX(0);
  transform-origin:center;
  transition:transform var(--ease);
}
.nav-link:hover{color:var(--text);}
.nav-link:hover::after{transform:scaleX(1);}
.nav-link:focus-visible{outline:2px solid var(--primary);outline-offset:2px;}
.nav-link.is-active{color:var(--text);font-weight:600;}
.nav-link.is-active::after{transform:scaleX(1);}

.brand{
  display:inline-flex;
  align-items:center;
  gap:9px;
  justify-self:center;
  font-size:18px;
  font-weight:700;
  color:var(--text);
  letter-spacing:.01em;
  white-space:nowrap;
}
.brand-mark{
  width:10px;
  height:10px;
  border-radius:3px;
  background:linear-gradient(135deg,var(--primary),var(--primary-deep));
  box-shadow:0 0 14px rgba(31,224,192,.7);
  flex:none;
}
.brand:hover{color:var(--primary);}
.brand:focus-visible{outline:2px solid var(--primary);outline-offset:4px;border-radius:6px;}

.nav-tools{display:flex;align-items:center;gap:8px;margin-left:8px;}
.icon-btn{
  width:40px;
  height:40px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border-radius:var(--r-sm);
  border:1px solid var(--line);
  background:rgba(255,255,255,.04);
  color:var(--text-2);
  cursor:pointer;
  transition:color var(--ease),border-color var(--ease),background var(--ease),transform var(--ease);
}
.icon-btn:hover{color:var(--primary);border-color:rgba(31,224,192,.45);background:rgba(31,224,192,.1);}
.icon-btn:active{transform:translateY(1px);}
.icon-btn:focus-visible{outline:2px solid var(--primary);outline-offset:2px;}
.icon-btn[aria-pressed="true"]{color:var(--primary);border-color:rgba(31,224,192,.6);background:rgba(31,224,192,.14);}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:44px;
  padding:0 20px;
  border-radius:var(--r-md);
  font-size:15px;
  font-weight:600;
  border:1px solid transparent;
  cursor:pointer;
  transition:transform var(--ease),box-shadow var(--ease),background var(--ease),border-color var(--ease),color var(--ease),filter var(--ease);
}
.btn-sm{min-height:40px;padding:0 16px;font-size:14px;}
.btn-primary{
  background:var(--primary);
  color:#04121A;
  box-shadow:0 0 0 1px rgba(31,224,192,.5),0 10px 30px rgba(31,224,192,.28);
}
.btn-primary:hover{
  filter:brightness(1.08);
  transform:translateY(-2px);
  box-shadow:0 0 0 1px rgba(31,224,192,.6),0 16px 36px rgba(31,224,192,.34);
}
.btn-primary:active{transform:translateY(-1px);box-shadow:0 0 0 1px rgba(31,224,192,.5),0 6px 18px rgba(31,224,192,.26);}
.btn-primary:focus-visible{outline:2px solid var(--primary);outline-offset:3px;}
.btn-ghost{
  background:linear-gradient(160deg,rgba(255,255,255,.07),rgba(255,255,255,.02));
  border-color:rgba(31,224,192,.45);
  color:var(--text);
}
.btn-ghost:hover{background:rgba(31,224,192,.12);border-color:var(--primary);transform:translateY(-2px);}
.btn-ghost:active{transform:translateY(-1px);}
.btn-ghost:focus-visible{outline:2px solid var(--primary);outline-offset:3px;}
.btn-block{width:100%;}

.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  height:40px;
  padding:0 14px;
  border-radius:var(--r-sm);
  border:1px solid var(--line);
  background:rgba(255,255,255,.04);
  color:var(--text);
  font-size:14px;
  cursor:pointer;
}
.nav-toggle:hover{border-color:rgba(31,224,192,.5);color:var(--primary);}
.nav-toggle:focus-visible{outline:2px solid var(--primary);outline-offset:2px;}

.nav-backdrop{
  position:fixed;
  inset:0;
  background:rgba(3,6,12,.7);
  opacity:0;
  visibility:hidden;
  transition:opacity var(--ease),visibility var(--ease);
  z-index:90;
}
.nav-backdrop.is-open{opacity:1;visibility:visible;}

.nav-drawer{
  position:fixed;
  top:0;
  right:0;
  width:290px;
  max-width:86vw;
  height:100%;
  background:var(--panel);
  border-left:1px solid var(--line);
  padding:24px 20px 28px;
  transform:translateX(102%);
  transition:transform 240ms ease-out;
  z-index:95;
  display:flex;
  flex-direction:column;
  overflow-y:auto;
}
.nav-drawer.is-open{transform:translateX(0);}
.drawer-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  margin-bottom:18px;
  padding-bottom:16px;
  border-bottom:1px solid var(--line);
}
.drawer-title{font-size:15px;font-weight:700;color:var(--text);}
.drawer-close{
  width:36px;height:36px;border-radius:10px;
  border:1px solid var(--line);
  background:rgba(255,255,255,.04);
  color:var(--text-2);
  cursor:pointer;
}
.drawer-close:hover{color:var(--primary);border-color:rgba(31,224,192,.5);}
.drawer-links a{
  display:flex;
  align-items:center;
  justify-content:space-between;
  height:48px;
  padding:0 12px;
  border-radius:var(--r-sm);
  color:var(--text-2);
  font-size:15px;
}
.drawer-links a:hover{background:rgba(31,224,192,.1);color:var(--text);}
.drawer-links a.is-active{color:var(--primary);background:rgba(31,224,192,.08);}
.drawer-foot{margin-top:auto;padding-top:20px;}

/* ============ 面包屑 ============ */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-size:13px;
  color:var(--text-3);
  letter-spacing:.02em;
  margin-bottom:16px;
}
.breadcrumb a{color:var(--text-3);}
.breadcrumb a:hover{color:var(--primary);}
.breadcrumb span{opacity:.5;}
.breadcrumb em{font-style:normal;color:var(--text-2);}

/* ============ 分类 Hero ============ */
.page-hero{
  position:relative;
  padding:52px 0 56px;
  background-image:linear-gradient(100deg,rgba(6,10,20,.96) 30%,rgba(6,10,20,.72) 70%,rgba(6,10,20,.9)),url("/assets/images/backpic/back-2.png");
  background-size:cover;
  background-position:center;
  border-bottom:1px solid var(--line-soft);
  overflow:hidden;
}
.page-hero::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);
  background-size:32px 32px;
  opacity:.6;
  pointer-events:none;
}
.page-hero::after{
  content:"";
  position:absolute;
  left:-120px;
  bottom:-160px;
  width:420px;
  height:420px;
  background:radial-gradient(circle,rgba(31,224,192,.16),transparent 66%);
  pointer-events:none;
}
.page-hero .grid-container{position:relative;z-index:2;}
.hero-row{align-items:center;}
.hero-copy h1{
  font-size:clamp(26px,3.6vw,38px);
  line-height:1.25;
  font-weight:700;
  margin-bottom:14px;
}
.hero-desc{
  max-width:640px;
  font-size:16px;
  color:var(--text-2);
  line-height:1.8;
}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px;}
.hero-media img{
  width:100%;
  aspect-ratio:16/10;
  object-fit:cover;
  border-radius:20px;
  border:1px solid var(--line);
  box-shadow:var(--shadow-1);
}
.hero-media{position:relative;}

/* ============ 通用板块 ============ */
.section{padding:72px 0;}
.section-alt{background:var(--bg-2);border-top:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft);}
.section-head{margin-bottom:32px;max-width:780px;}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:12px;
  letter-spacing:.14em;
  color:var(--primary);
  margin-bottom:12px;
}
.eyebrow::before{
  content:"";
  width:2px;
  height:16px;
  background:var(--primary);
  border-radius:2px;
  box-shadow:0 0 10px rgba(31,224,192,.7);
}
.section-head h2{
  font-size:clamp(22px,2.8vw,30px);
  line-height:1.35;
  margin-bottom:12px;
}
.section-head p{font-size:15px;color:var(--text-2);line-height:1.8;}

/* ============ 数据条 ============ */
.stat-strip{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:1px;
  background:var(--line-soft);
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  overflow:hidden;
}
.stat-item{
  background:var(--bg-3);
  padding:22px 20px;
  transition:background var(--ease);
}
.stat-item:hover{background:#0C1728;}
.stat-num{
  font-size:26px;
  font-weight:700;
  color:var(--primary);
  line-height:1.2;
  letter-spacing:.01em;
}
.stat-item .stat-label{
  display:block;
  margin-top:6px;
  font-size:13px;
  color:var(--text-3);
  letter-spacing:.04em;
}

/* ============ 对照清单表 ============ */
.spec-table{
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  background:linear-gradient(160deg,rgba(255,255,255,.05),rgba(255,255,255,.015));
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  overflow:hidden;
  box-shadow:var(--shadow-1);
}
.spec-head{
  display:grid;
  grid-template-columns:1.05fr 2fr .82fr;
  gap:20px;
  padding:16px 24px;
  font-size:12px;
  letter-spacing:.14em;
  color:var(--text-3);
  background:rgba(255,255,255,.03);
  border-bottom:1px solid var(--line);
}
.spec-row{
  display:grid;
  grid-template-columns:1.05fr 2fr .82fr;
  gap:20px;
  align-items:center;
  padding:20px 24px;
  border-bottom:1px solid var(--line-soft);
  transition:background var(--ease);
}
.spec-row:last-child{border-bottom:none;}
.spec-row:hover{background:rgba(31,224,192,.06);}
.spec-row:hover .spec-idx{color:var(--primary);opacity:1;}
.spec-name{
  display:flex;
  align-items:center;
  gap:10px;
  font-size:16px;
  font-weight:600;
  color:var(--text);
}
.spec-idx{
  font-size:12px;
  font-weight:700;
  color:var(--text-3);
  opacity:.7;
  letter-spacing:.06em;
  transition:color var(--ease),opacity var(--ease);
  flex:none;
}
.spec-desc{font-size:14px;line-height:1.75;color:var(--text-2);}
.spec-status{justify-self:start;}

.badge{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 12px;
  border-radius:999px;
  font-size:12px;
  font-weight:600;
  line-height:1.4;
  white-space:nowrap;
}
.badge-open{
  color:var(--primary);
  border:1px solid rgba(31,224,192,.5);
  background:rgba(31,224,192,.08);
}
.badge-hot{
  color:#FFF3F0;
  background:var(--coral);
  border:1px solid #FF7A67;
  box-shadow:0 6px 18px rgba(255,92,70,.28);
}
.badge-muted{
  color:var(--text-3);
  border:1px solid var(--line);
  background:rgba(255,255,255,.04);
}

/* ============ 领取节奏 ============ */
.flow-steps{
  display:grid;
  grid-template-columns:repeat(5,1fr);
  gap:16px;
}
.flow-step{
  position:relative;
  padding:24px 18px 20px;
  border-radius:var(--r-lg);
  border:1px solid var(--line);
  background:linear-gradient(160deg,rgba(255,255,255,.06),rgba(255,255,255,.02));
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  transition:transform var(--ease),box-shadow var(--ease),border-color var(--ease);
}
.flow-step::before{
  content:"";
  position:absolute;
  top:0;
  left:18px;
  right:18px;
  height:3px;
  border-radius:0 0 3px 3px;
  background:linear-gradient(90deg,var(--primary),rgba(31,224,192,.15));
}
.flow-step:hover{
  transform:translateY(-4px);
  border-color:rgba(31,224,192,.4);
  box-shadow:var(--shadow-2),0 0 0 1px rgba(31,224,192,.25);
}
.flow-dot{
  width:12px;
  height:12px;
  border-radius:50%;
  background:var(--primary);
  box-shadow:0 0 0 4px rgba(31,224,192,.14),0 0 16px rgba(31,224,192,.65);
  margin-bottom:14px;
}
.flow-step h3{font-size:16px;font-weight:600;margin-bottom:8px;}
.flow-step p{font-size:13px;line-height:1.7;color:var(--text-2);}
.flow-num{
  position:absolute;
  top:16px;
  right:16px;
  font-size:12px;
  font-weight:700;
  letter-spacing:.08em;
  color:var(--text-3);
  opacity:.6;
}

/* ============ 图文说明块 ============ */
.note-block{
  display:grid;
  grid-template-columns:1.15fr 1fr;
  gap:32px;
  align-items:center;
  padding:28px;
  border-radius:var(--r-lg);
  border:1px solid var(--line);
  background:linear-gradient(160deg,rgba(255,255,255,.06),rgba(255,255,255,.02));
  margin-top:28px;
}
.note-block img{
  width:100%;
  aspect-ratio:4/3;
  object-fit:cover;
  border-radius:14px;
  border:1px solid var(--line);
}
.note-block h3{font-size:20px;margin-bottom:12px;}
.note-block p{font-size:15px;line-height:1.8;color:var(--text-2);}
.note-list{margin-top:16px;display:grid;gap:10px;}
.note-list li{
  display:flex;
  gap:10px;
  font-size:14px;
  color:var(--text-2);
  line-height:1.7;
}
.note-list li i{color:var(--primary);margin-top:5px;font-size:12px;flex:none;}

/* ============ FAQ ============ */
.faq-list{display:grid;gap:14px;}
.faq-item{
  border:1px solid var(--line);
  border-radius:14px;
  background:linear-gradient(160deg,rgba(255,255,255,.06),rgba(255,255,255,.02));
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  transition:border-color var(--ease),box-shadow var(--ease);
  overflow:hidden;
}
.faq-item:hover{border-color:rgba(31,224,192,.35);}
.faq-item[open]{border-color:rgba(31,224,192,.5);box-shadow:0 18px 40px rgba(0,0,0,.35);}
.faq-item summary{
  list-style:none;
  cursor:pointer;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:18px 20px;
  font-size:16px;
  font-weight:600;
  color:var(--text);
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{
  content:"+";
  font-size:20px;
  line-height:1;
  color:var(--primary);
  transition:transform var(--ease);
  flex:none;
}
.faq-item[open] summary::after{transform:rotate(45deg);}
.faq-item summary:focus-visible{outline:2px solid var(--primary);outline-offset:-2px;}
.faq-body{
  padding:0 20px 20px;
  font-size:15px;
  line-height:1.8;
  color:var(--text-2);
}

/* ============ CTA 条 ============ */
.cta-bar{
  position:relative;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  flex-wrap:wrap;
  padding:28px 32px;
  border-radius:var(--r-lg);
  border:1px solid rgba(31,224,192,.28);
  background:linear-gradient(160deg,rgba(31,224,192,.12),rgba(255,255,255,.02));
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  overflow:hidden;
}
.cta-bar::after{
  content:"";
  position:absolute;
  right:-80px;
  top:-90px;
  width:260px;
  height:260px;
  background:radial-gradient(circle,rgba(255,92,70,.16),transparent 68%);
  pointer-events:none;
}
.cta-bar h2{font-size:clamp(19px,2.2vw,24px);margin-bottom:8px;}
.cta-bar p{font-size:14px;color:var(--text-2);}
.cta-actions{display:flex;gap:12px;flex-wrap:wrap;}

/* ============ 相关分类 ============ */
.related-cats{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
}
.cat-chip{
  display:inline-flex;
  align-items:center;
  gap:8px;
  height:44px;
  padding:0 18px;
  border-radius:999px;
  border:1px solid var(--line);
  background:rgba(255,255,255,.04);
  color:var(--text-2);
  font-size:14px;
  transition:color var(--ease),border-color var(--ease),background var(--ease),transform var(--ease);
}
.cat-chip i{font-size:12px;color:var(--primary);}
.cat-chip:hover{
  color:var(--text);
  border-color:rgba(31,224,192,.55);
  background:rgba(31,224,192,.1);
  transform:translateY(-2px);
}
.cat-chip:focus-visible{outline:2px solid var(--primary);outline-offset:2px;}

/* ============ 页脚 ============ */
.site-footer{
  margin-top:24px;
  padding:64px 0 28px;
  background:var(--bg-3);
  border-top:1px solid var(--line-soft);
  position:relative;
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;
  left:-140px;
  bottom:-160px;
  width:420px;
  height:420px;
  background:radial-gradient(circle,rgba(31,224,192,.12),transparent 68%);
  pointer-events:none;
}
.site-footer .grid-container{position:relative;z-index:2;}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.3fr;
  gap:32px;
}
.footer-brand-name{
  display:inline-block;
  font-size:17px;
  font-weight:700;
  color:var(--text);
  margin-bottom:12px;
}
.footer-brand-name:hover{color:var(--primary);}
.footer-brand p{font-size:13px;line-height:1.8;color:var(--text-3);max-width:300px;}
.footer-col h4{
  font-size:14px;
  font-weight:600;
  color:var(--text);
  margin-bottom:14px;
  letter-spacing:.04em;
}
.footer-links{display:grid;gap:4px;}
.footer-links a{
  position:relative;
  display:inline-block;
  padding:6px 0 6px 0;
  font-size:14px;
  color:var(--text-2);
}
.footer-links a::before{
  content:"";
  position:absolute;
  left:-10px;
  top:50%;
  transform:translateY(-50%) scaleY(0);
  width:2px;
  height:14px;
  background:var(--primary);
  border-radius:2px;
  transition:transform var(--ease);
}
.footer-links a:hover{color:var(--primary);}
.footer-links a:hover::before{transform:translateY(-50%) scaleY(1);}
.footer-links a:focus-visible{outline:2px solid var(--primary);outline-offset:2px;}

.sub-form{display:grid;gap:10px;}
.sub-form label{font-size:13px;line-height:1.6;color:var(--text-3);}
.sub-form input{
  height:44px;
  padding:0 14px;
  border-radius:var(--r-sm);
  border:1px solid var(--line);
  background:rgba(255,255,255,.04);
  color:var(--text);
  font-size:14px;
  transition:border-color var(--ease),box-shadow var(--ease);
}
.sub-form input::placeholder{color:var(--text-3);}
.sub-form input:hover{border-color:rgba(255,255,255,.2);}
.sub-form input:focus{
  outline:none;
  border-color:var(--primary);
  box-shadow:0 0 0 3px rgba(31,224,192,.18);
}
.sub-form input.is-error{border-color:var(--coral);box-shadow:0 0 0 3px rgba(255,92,70,.16);}
.form-note{font-size:12px;color:var(--text-3);line-height:1.6;}
.form-note.is-error{color:var(--coral);}

.footer-bottom{
  margin-top:44px;
  padding-top:20px;
  border-top:1px solid var(--line-soft);
  display:flex;
  justify-content:space-between;
  gap:12px;
  flex-wrap:wrap;
  font-size:13px;
  color:var(--text-3);
}

/* ============ 响应式 ============ */
@media screen and (max-width:1023px){
  .nav-shell{display:flex;justify-content:space-between;height:60px;}
  .nav-left,.nav-right{display:none;}
  .nav-toggle{display:inline-flex;}
  .brand{font-size:16px;}
  .section{padding:56px 0;}
  .page-hero{padding:40px 0 46px;}
  .hero-media{margin-top:28px;}
  .stat-strip{grid-template-columns:repeat(2,1fr);}
  .flow-steps{grid-template-columns:repeat(2,1fr);}
  .note-block{grid-template-columns:1fr;}
  .note-block img{order:-1;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px;}
}

@media screen and (max-width:767px){
  body{font-size:15px;}
  .spec-head{display:none;}
  .spec-row{grid-template-columns:1fr;gap:10px;padding:18px 18px;}
  .spec-status{justify-self:start;}
  .section{padding:48px 0;}
  .cta-bar{padding:24px 20px;}
  .cta-actions{width:100%;}
  .cta-actions .btn{flex:1 1 100%;}
  .faq-item summary{font-size:15px;padding:16px;}
  .footer-grid{grid-template-columns:1fr;}
  .footer-bottom{flex-direction:column;}
}

@media screen and (max-width:519px){
  .stat-strip{grid-template-columns:1fr;}
  .flow-steps{grid-template-columns:1fr;}
  .hero-actions .btn{width:100%;}
  .brand{font-size:15px;}
  .brand-mark{width:8px;height:8px;}
  .related-cats{gap:10px;}
  .cat-chip{width:100%;justify-content:flex-start;}
}

/* roulang page: category5 */
:root{
  --bg:#060A14;
  --bg-panel:#0B1220;
  --bg-a:#080E1A;
  --bg-b:#0A1424;
  --line:rgba(255,255,255,.08);
  --line-soft:rgba(255,255,255,.07);
  --primary:#1FE0C0;
  --primary-deep:#12A98F;
  --coral:#FF5C46;
  --text:#E8EEF7;
  --body:#A9B6C9;
  --muted:#6E7C90;
  --radius-card:16px;
  --radius-img:14px;
  --radius-sm:10px;
  --radius-btn:12px;
  --shadow:0 18px 40px rgba(0,0,0,.45);
  --shadow-hover:0 26px 56px rgba(0,0,0,.55), 0 0 0 1px rgba(31,224,192,.35);
  --glass:linear-gradient(160deg, rgba(255,255,255,.07), rgba(255,255,255,.02));
  --ease:200ms ease-out;
  --maxw:1200px;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--body);
  font-family:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{color:var(--text);margin:0 0 14px;font-weight:700;letter-spacing:0;}
h1{font-size:clamp(28px,4.2vw,44px);line-height:1.22;}
h2{font-size:clamp(22px,3vw,32px);line-height:1.3;}
h3{font-size:20px;line-height:1.4;font-weight:600;}
h4{font-size:17px;line-height:1.5;font-weight:600;}
p{margin:0 0 1.15em;max-width:800px;}
p:last-child{margin-bottom:0;}
a{color:var(--primary);text-decoration:none;transition:color var(--ease),background-color var(--ease),border-color var(--ease),box-shadow var(--ease),transform var(--ease);}
a:hover{color:#5BF0D6;}
a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--primary);outline-offset:2px;}
img{max-width:100%;display:block;border-radius:var(--radius-img);}
ul,ol{margin:0;padding:0;list-style:none;}
button{font-family:inherit;}
.grid-container{max-width:var(--maxw);padding-left:32px;padding-right:32px;margin:0 auto;}
@media screen and (max-width:639px){
  .grid-container{padding-left:20px;padding-right:20px;}
}

/* ---------- 导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(6,10,20,.82);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
  transition:background-color var(--ease),box-shadow var(--ease);
}
.site-header.is-scrolled{background:rgba(6,10,20,.95);box-shadow:0 10px 30px rgba(0,0,0,.45);}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;gap:18px;
  height:72px;transition:height var(--ease);
}
.site-header.is-scrolled .header-inner{height:60px;}
.nav-left,.nav-right{display:flex;align-items:center;gap:6px;flex:1 1 0;min-width:0;}
.nav-left{justify-content:flex-start;}
.nav-right{justify-content:flex-end;}
.nav-link{
  position:relative;display:inline-flex;align-items:center;height:40px;padding:0 12px;
  color:var(--body);font-size:14.5px;border-radius:var(--radius-sm);white-space:nowrap;
}
.nav-link::after{
  content:"";position:absolute;left:12px;right:12px;bottom:4px;height:2px;border-radius:2px;
  background:var(--primary);transform:scaleX(0);transform-origin:left center;transition:transform var(--ease);
}
.nav-link:hover,.nav-link:focus-visible{color:var(--text);background:rgba(31,224,192,.08);}
.nav-link:hover::after{transform:scaleX(1);}
.nav-link.is-active{color:var(--primary);}
.nav-link.is-active::after{transform:scaleX(1);}
.brand{
  position:relative;display:inline-flex;flex-direction:column;align-items:center;justify-content:center;
  padding:6px 16px;border-radius:var(--radius-sm);text-align:center;flex:0 0 auto;
}
.brand-text{color:var(--text);font-size:18px;font-weight:700;line-height:1.2;letter-spacing:.01em;white-space:nowrap;}
.brand-sub{color:var(--muted);font-size:11px;letter-spacing:.16em;line-height:1.4;}
.brand::before,.brand::after{
  content:"";position:absolute;top:50%;width:6px;height:22px;margin-top:-11px;border-radius:2px;
  background:var(--primary);opacity:.85;
}
.brand::before{left:0;}
.brand::after{right:0;}
.brand:hover .brand-text{color:var(--primary);}
.nav-cta{margin-left:10px;}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:0 20px;border-radius:var(--radius-btn);
  font-size:15px;font-weight:600;border:1px solid transparent;cursor:pointer;
  transition:transform var(--ease),box-shadow var(--ease),background-color var(--ease),color var(--ease),border-color var(--ease);
}
.btn-sm{min-height:38px;padding:0 16px;font-size:13.5px;}
.btn-primary{
  background:var(--primary);color:#04121A;
  box-shadow:0 0 0 1px rgba(31,224,192,.5), 0 10px 30px rgba(31,224,192,.28);
}
.btn-primary:hover{filter:brightness(1.08);transform:translateY(-2px);box-shadow:0 0 0 1px rgba(31,224,192,.6), 0 16px 36px rgba(31,224,192,.34);color:#04121A;}
.btn-primary:active{transform:translateY(-1px);box-shadow:0 0 0 1px rgba(31,224,192,.5), 0 6px 18px rgba(31,224,192,.24);}
.btn-ghost{
  background:var(--glass);color:var(--text);border-color:rgba(31,224,192,.45);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
}
.btn-ghost:hover{background:rgba(31,224,192,.12);color:var(--text);transform:translateY(-2px);}
.btn-ghost:active{transform:translateY(-1px);}
.btn-block{width:100%;}
.nav-toggle{
  display:none;width:44px;height:44px;border-radius:var(--radius-sm);
  background:var(--glass);border:1px solid var(--line);cursor:pointer;
  flex-direction:column;align-items:center;justify-content:center;gap:5px;
}
.nav-toggle span{display:block;width:20px;height:2px;border-radius:2px;background:var(--text);transition:transform var(--ease),opacity var(--ease);}
.nav-toggle.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.nav-toggle.is-open span:nth-child(2){opacity:0;}
.nav-toggle.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}
.mobile-drawer{
  display:none;overflow:hidden;max-height:0;
  border-top:1px solid transparent;
  background:rgba(8,14,26,.98);
  transition:max-height 240ms ease-out,border-color var(--ease);
}
.mobile-drawer.is-open{max-height:520px;border-top-color:var(--line);}
.mobile-drawer ul{padding:10px 20px 20px;}
.mobile-drawer li{border-bottom:1px solid var(--line);}
.mobile-drawer li:last-child{border-bottom:0;}
.mobile-drawer a{
  display:flex;align-items:center;justify-content:space-between;
  height:48px;color:var(--body);font-size:15px;
}
.mobile-drawer a:hover,.mobile-drawer a.is-active{color:var(--primary);}
.mobile-drawer a i{font-size:12px;color:var(--muted);}
.mobile-drawer .drawer-cta{padding:0 20px 22px;}
@media screen and (max-width:1023px){
  .nav-left,.nav-right{display:none;}
  .nav-toggle{display:flex;}
  .mobile-drawer{display:block;}
  .brand-text{font-size:16px;}
  .header-inner{height:64px;}
}

/* ---------- 分类 Hero ---------- */
.page-hero{
  position:relative;overflow:hidden;
  background-image:
    radial-gradient(600px 260px at 12% 0%, rgba(31,224,192,.14), transparent 70%),
    radial-gradient(520px 240px at 92% 100%, rgba(255,92,70,.10), transparent 72%),
    linear-gradient(180deg, rgba(6,10,20,.62), rgba(6,10,20,.94)),
    url("/assets/images/backpic/back-2.png");
  background-size:cover,cover,cover,cover;
  background-position:center;
  border-bottom:1px solid var(--line);
}
.page-hero::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size:32px 32px;
  opacity:.6;
}
.page-hero .grid-container{position:relative;z-index:2;}
.hero-pad{padding:26px 0 44px;}
@media screen and (min-width:1024px){
  .hero-pad{padding:34px 0 52px;min-height:320px;display:flex;flex-direction:column;justify-content:center;}
}
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--muted);margin-bottom:22px;}
.breadcrumb a{color:var(--muted);}
.breadcrumb a:hover{color:var(--primary);}
.breadcrumb .sep{color:rgba(255,255,255,.22);}
.breadcrumb .current{color:var(--body);}
.badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:6px 12px;border-radius:999px;font-size:12px;letter-spacing:.04em;
  border:1px solid rgba(31,224,192,.45);color:var(--primary);background:rgba(31,224,192,.08);
}
.badge-coral{border-color:rgba(255,92,70,.5);color:var(--coral);background:rgba(255,92,70,.12);}
.hero-title{margin:16px 0 14px;}
.hero-lead{color:var(--body);font-size:16.5px;max-width:660px;margin-bottom:22px;}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:8px 12px;border-radius:var(--radius-sm);font-size:13px;color:var(--body);
  background:var(--glass);border:1px solid var(--line);
}
.tag i{color:var(--primary);font-size:12px;}
.hero-media{position:relative;}
.hero-media img{
  width:100%;height:100%;max-height:280px;object-fit:cover;
  border:1px solid var(--line);box-shadow:var(--shadow);
}
.hero-media::before{
  content:"";position:absolute;inset:0;border-radius:var(--radius-img);pointer-events:none;
  background:linear-gradient(160deg, rgba(31,224,192,.20), rgba(6,10,20,0) 62%);
}
.hero-note{
  position:absolute;right:14px;bottom:14px;
  display:flex;align-items:center;gap:10px;
  padding:10px 14px;border-radius:var(--radius-sm);
  background:rgba(11,18,32,.78);border:1px solid rgba(255,255,255,.12);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
}
.hero-note strong{color:var(--primary);font-size:18px;line-height:1;}
.hero-note span{font-size:12px;color:var(--body);}
@media screen and (max-width:767px){
  .hero-media img{max-height:220px;}
  .hero-note{right:10px;bottom:10px;padding:8px 12px;}
}

/* ---------- 主体布局 ---------- */
.main-wrap{padding:64px 0 72px;background:var(--bg);}
@media screen and (max-width:1023px){.main-wrap{padding:48px 0 56px;}}

.anchor-panel{
  position:sticky;top:96px;
  background:var(--glass);border:1px solid rgba(255,255,255,.09);
  border-radius:var(--radius-card);padding:22px;
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  box-shadow:var(--shadow);
}
.anchor-panel h3{font-size:15px;letter-spacing:.06em;color:var(--muted);font-weight:600;margin-bottom:14px;}
.anchor-list li + li{margin-top:4px;}
.anchor-link{
  display:flex;align-items:center;gap:12px;
  padding:11px 12px;border-radius:var(--radius-sm);
  color:var(--body);font-size:14.5px;border-left:2px solid transparent;
}
.anchor-link .num{
  font-size:12px;font-weight:700;color:var(--muted);letter-spacing:.08em;min-width:22px;
}
.anchor-link:hover{background:rgba(31,224,192,.08);color:var(--text);}
.anchor-link.is-active{background:rgba(31,224,192,.10);color:var(--primary);border-left-color:var(--primary);}
.anchor-link.is-active .num{color:var(--primary);}
.anchor-tip{
  margin-top:18px;padding:14px;border-radius:var(--radius-sm);
  background:rgba(255,92,70,.08);border:1px solid rgba(255,92,70,.28);
  font-size:13px;line-height:1.7;color:var(--body);
}
.anchor-tip strong{color:var(--coral);}
@media screen and (max-width:1023px){
  .anchor-panel{position:static;margin-bottom:32px;}
  .anchor-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px;}
  .anchor-list li + li{margin-top:0;}
}
@media screen and (max-width:639px){.anchor-list{grid-template-columns:1fr;}}

/* ---------- 分节内容 ---------- */
.sec{padding:36px 0;border-top:1px solid var(--line);}
.sec:first-child{border-top:0;padding-top:0;}
.sec-head{display:flex;align-items:baseline;gap:14px;margin-bottom:16px;}
.sec-index{
  font-size:clamp(30px,5vw,46px);font-weight:700;line-height:1;
  color:rgba(255,255,255,.10);letter-spacing:-.02em;
}
.sec-head h2{margin:0;}
.sec-body p{font-size:16px;color:var(--body);}
.sec-figure{margin:24px 0;position:relative;}
.sec-figure img{width:100%;aspect-ratio:16/9;object-fit:cover;border:1px solid var(--line);}
.sec-figure figcaption{font-size:13px;color:var(--muted);text-align:center;margin-top:10px;}

.check-list{margin-top:8px;display:grid;gap:12px;}
.check-row{
  display:grid;grid-template-columns:44px minmax(0,1fr) auto;gap:16px;align-items:center;
  padding:16px;border-radius:var(--radius-sm);
  background:rgba(255,255,255,.02);border:1px solid var(--line);
  transition:background-color var(--ease),border-color var(--ease),transform var(--ease);
}
.check-row:hover{background:rgba(31,224,192,.07);border-color:rgba(31,224,192,.35);transform:translateX(4px);}
.check-icon{
  width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  background:rgba(31,224,192,.10);color:var(--primary);font-size:16px;
}
.check-main h4{margin:0 0 4px;font-size:15.5px;color:var(--text);}
.check-main p{margin:0;font-size:13.5px;line-height:1.7;color:var(--muted);max-width:none;}
.check-flag{font-size:12px;padding:5px 10px;border-radius:999px;white-space:nowrap;}
.flag-ok{border:1px solid rgba(31,224,192,.4);color:var(--primary);background:rgba(31,224,192,.08);}
.flag-warn{border:1px solid rgba(255,92,70,.45);color:var(--coral);background:rgba(255,92,70,.10);}
@media screen and (max-width:767px){
  .check-row{grid-template-columns:40px minmax(0,1fr);}
  .check-flag{grid-column:2;justify-self:start;}
}

.pheno-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:20px;}
.pheno-card{
  padding:20px;border-radius:var(--radius-card);
  background:var(--glass);border:1px solid rgba(255,255,255,.09);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  transition:transform var(--ease),box-shadow var(--ease),border-color var(--ease);
}
.pheno-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);border-color:rgba(31,224,192,.35);}
.pheno-card i{color:var(--primary);font-size:18px;}
.pheno-card h4{margin:12px 0 8px;font-size:16px;}
.pheno-card p{font-size:13.5px;color:var(--muted);margin:0;max-width:none;line-height:1.7;}
@media screen and (max-width:1023px){.pheno-grid{grid-template-columns:repeat(2,minmax(0,1fr));}}
@media screen and (max-width:639px){.pheno-grid{grid-template-columns:1fr;}}

.callout{
  margin-top:24px;padding:18px 20px;border-radius:var(--radius-card);
  background:rgba(31,224,192,.07);border:1px solid rgba(31,224,192,.30);
  display:flex;gap:14px;align-items:flex-start;
}
.callout i{color:var(--primary);font-size:18px;margin-top:2px;}
.callout p{margin:0;font-size:14.5px;color:var(--body);max-width:none;}

/* ---------- 相关分类 ---------- */
.related{margin-top:20px;padding-top:36px;border-top:1px solid var(--line);}
.related-heading{font-size:17px;color:var(--text);margin-bottom:16px;font-weight:600;}
.related-links{display:flex;flex-wrap:wrap;gap:12px;}
.related-link{
  display:inline-flex;align-items:center;gap:10px;
  padding:12px 18px;border-radius:var(--radius-sm);font-size:14.5px;color:var(--text);
  background:var(--glass);border:1px solid var(--line);
}
.related-link i{font-size:12px;color:var(--primary);transition:transform var(--ease);}
.related-link:hover{border-color:rgba(31,224,192,.45);background:rgba(31,224,192,.10);transform:translateY(-2px);}
.related-link:hover i{transform:translateX(4px);}

/* ---------- FAQ ---------- */
.faq-section{margin-top:56px;padding-top:40px;border-top:1px solid var(--line);}
.faq-section > p{color:var(--muted);font-size:15px;margin-bottom:24px;}
.faq-list{display:grid;gap:12px;}
.faq-item{
  border-radius:var(--radius-card);overflow:hidden;
  background:var(--glass);border:1px solid rgba(255,255,255,.09);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  transition:border-color var(--ease),box-shadow var(--ease);
}
.faq-item:hover{border-color:rgba(31,224,192,.30);}
.faq-item.is-open{border-color:rgba(31,224,192,.55);box-shadow:0 0 0 1px rgba(31,224,192,.18);}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px 20px;background:transparent;border:0;cursor:pointer;text-align:left;
  color:var(--text);font-size:16px;font-weight:600;line-height:1.5;
}
.faq-q .plus{
  flex:0 0 auto;width:26px;height:26px;position:relative;border-radius:8px;
  background:rgba(31,224,192,.10);transition:transform var(--ease),background-color var(--ease);
}
.faq-q .plus::before,.faq-q .plus::after{
  content:"";position:absolute;left:50%;top:50%;background:var(--primary);border-radius:2px;
  transform:translate(-50%,-50%);
}
.faq-q .plus::before{width:12px;height:2px;}
.faq-q .plus::after{width:2px;height:12px;}
.faq-item.is-open .faq-q .plus{transform:rotate(45deg);background:rgba(31,224,192,.20);}
.faq-a{max-height:0;overflow:hidden;transition:max-height 240ms ease-out;}
.faq-a p{padding:0 20px 20px;margin:0;font-size:15px;line-height:1.8;color:var(--body);max-width:none;}

/* ---------- CTA ---------- */
.cta-bar{
  margin-top:56px;padding:26px 28px;border-radius:var(--radius-card);
  background:linear-gradient(120deg, rgba(31,224,192,.14), rgba(255,92,70,.10));
  border:1px solid rgba(255,255,255,.12);
  display:flex;align-items:center;justify-content:space-between;gap:22px;flex-wrap:wrap;
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
}
.cta-bar .cta-text strong{display:block;color:var(--text);font-size:18px;font-weight:700;margin-bottom:6px;}
.cta-bar .cta-text span{font-size:14px;color:var(--body);}
.cta-actions{display:flex;gap:12px;flex-wrap:wrap;}
@media screen and (max-width:767px){
  .cta-bar{flex-direction:column;align-items:stretch;}
  .cta-actions .btn{flex:1 1 100%;}
}

/* ---------- 页脚 ---------- */
.site-footer{
  border-top:1px solid var(--line);
  background-image:
    radial-gradient(520px 220px at 8% 0%, rgba(31,224,192,.10), transparent 72%),
    radial-gradient(460px 200px at 96% 100%, rgba(255,92,70,.08), transparent 74%),
    linear-gradient(180deg, rgba(6,10,20,.4), rgba(6,10,20,1));
  padding:56px 0 26px;margin-top:0;
}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.3fr;gap:32px;}
.footer-brand-name{display:inline-block;color:var(--text);font-size:17px;font-weight:700;margin-bottom:12px;}
.footer-brand-name:hover{color:var(--primary);}
.footer-brand p{font-size:13.5px;color:var(--muted);line-height:1.8;max-width:320px;}
.footer-col h4{font-size:15px;margin-bottom:14px;color:var(--text);}
.footer-links li + li{margin-top:8px;}
.footer-links a{
  position:relative;display:inline-block;padding-left:0;
  font-size:13.5px;color:var(--body);
}
.footer-links a::before{
  content:"";position:absolute;left:-10px;top:50%;width:2px;height:0;background:var(--primary);
  transform:translateY(-50%);transition:height var(--ease),left var(--ease);
}
.footer-links a:hover{color:var(--primary);padding-left:10px;}
.footer-links a:hover::before{height:14px;left:0;}
.sub-form label{display:block;font-size:13px;color:var(--body);margin-bottom:10px;line-height:1.7;}
.sub-form input{
  width:100%;height:44px;padding:0 14px;border-radius:var(--radius-sm);
  background:rgba(255,255,255,.04);border:1px solid var(--line);color:var(--text);font-size:14px;
  transition:border-color var(--ease),box-shadow var(--ease),background-color var(--ease);
}
.sub-form input::placeholder{color:var(--muted);}
.sub-form input:hover{border-color:rgba(255,255,255,.18);}
.sub-form input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(31,224,192,.20);background:rgba(255,255,255,.06);}
.form-note{display:block;font-size:12px;color:var(--muted);margin:10px 0 12px;line-height:1.6;}
.form-note.is-error{color:var(--coral);}
.form-note.is-ok{color:var(--primary);}
.footer-bottom{
  margin-top:40px;padding-top:20px;border-top:1px solid var(--line);
  display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;
  font-size:12.5px;color:var(--muted);
}
@media screen and (max-width:1023px){
  .footer-grid{grid-template-columns:1fr 1fr;}
}
@media screen and (max-width:639px){
  .footer-grid{grid-template-columns:1fr;gap:28px;}
  .site-footer{padding:44px 0 22px;}
}
::selection{background:rgba(31,224,192,.28);color:#fff;}