/* roulang page: index */
:root{
  --ink-950:#05070E;
  --ink-900:#0A0F1C;
  --ink-800:#101827;
  --ink-700:#162033;
  --brand-500:#1F6BFF;
  --brand-400:#4D8BFF;
  --brand-600:#1550CC;
  --accent-400:#2BE8B0;
  --signal-500:#FF5C4D;
  --text-1:#E9EEF7;
  --text-2:#9AA7BE;
  --text-3:#64718A;
  --line:rgba(255,255,255,0.08);
  --line-soft:rgba(255,255,255,0.05);
  --radius-card:18px;
  --radius-phone:24px;
  --radius-btn:999px;
  --shadow-card:0 12px 32px -18px rgba(0,0,0,0.9);
  --shadow-glow:0 0 0 1px rgba(31,107,255,0.55), 0 10px 32px -10px rgba(31,107,255,0.7);
  --ease:180ms cubic-bezier(.2,.8,.2,1);
  --font-cn:-apple-system, "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", sans-serif;
  --font-mono:ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-cn);
  font-size:15px;
  line-height:1.7;
  color:var(--text-1);
  background:var(--ink-950);
  -webkit-font-smoothing:antialiased;
  padding-bottom:84px;
  overflow-x:hidden;
}
@media (min-width:768px){ body{padding-bottom:0;} }
img{max-width:100%;display:block;border-style:none;}
a{color:inherit;text-decoration:none;}
button{font-family:inherit;cursor:pointer;border:0;background:none;color:inherit;}
ul,ol{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4,p{margin:0;}
:focus-visible{outline:2px solid var(--brand-400);outline-offset:2px;border-radius:6px;}
.container-x{
  width:100%;
  max-width:1200px;
  margin:0 auto;
  padding-left:20px;
  padding-right:20px;
}
@media (min-width:768px){ .container-x{padding-left:28px;padding-right:28px;} }
@media (min-width:1024px){ .container-x{padding-left:40px;padding-right:40px;} }

.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:-0.01em;}
.nowrap{white-space:nowrap;}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:46px;
  padding:0 24px;
  font-size:14px;
  font-weight:600;
  border-radius:var(--radius-btn);
  transition:transform var(--ease), box-shadow var(--ease), background var(--ease), color var(--ease), border-color var(--ease);
  white-space:nowrap;
}
.btn-primary{
  background:linear-gradient(180deg,var(--brand-400),var(--brand-500));
  color:#fff;
  box-shadow:var(--shadow-glow);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 0 0 1px rgba(77,139,255,0.7),0 14px 38px -6px rgba(31,107,255,0.8);filter:brightness(1.06);}
.btn-primary:active{transform:translateY(0);}
.btn-ghost{
  background:rgba(255,255,255,0.03);
  color:var(--text-1);
  border:1px solid rgba(255,255,255,0.14);
  box-shadow:none;
}
.btn-ghost:hover{border-color:rgba(77,139,255,0.55);color:var(--accent-400);transform:translateY(-2px);}
.btn-sm{height:38px;padding:0 18px;font-size:13px;}
.btn-block{width:100%;}

/* ---------- header ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:rgba(5,7,14,0.55);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;
  transition:background var(--ease), border-color var(--ease), box-shadow var(--ease);
}
.site-header.is-scrolled{
  background:rgba(5,7,14,0.78);
  border-bottom-color:var(--line);
  box-shadow:0 14px 40px -30px rgba(0,0,0,1);
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  height:64px;
}
.logo{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto;}
.logo-mark{width:28px;height:28px;flex:0 0 auto;color:var(--brand-400);}
.logo-text{display:flex;align-items:baseline;gap:6px;line-height:1;}
.logo-cn{font-size:17px;font-weight:700;letter-spacing:0.02em;color:var(--text-1);}
.logo-en{font-family:var(--font-mono);font-size:11px;letter-spacing:0.14em;text-transform:lowercase;color:var(--text-3);}
@media (min-width:768px){
  .header-inner{height:72px;}
  .logo-mark{width:32px;height:32px;}
  .logo-cn{font-size:19px;}
  .logo-en{font-size:12px;}
}
.main-nav{display:none;}
@media (min-width:1024px){
  .main-nav{display:flex;align-items:center;gap:28px;}
}
.nav-link{
  position:relative;
  font-size:14px;
  color:var(--text-2);
  padding:6px 0;
  transition:color var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:-2px;
  height:2px;
  border-radius:2px;
  background:var(--brand-500);
  opacity:0;
  transform:scaleX(0.4);
  transition:opacity var(--ease), transform var(--ease);
}
.nav-link:hover{color:var(--text-1);}
.nav-link:hover::after{opacity:0.5;transform:scaleX(1);}
.nav-link.active{color:var(--brand-400);font-weight:600;}
.nav-link.active::after{opacity:1;transform:scaleX(1);}
.header-cta{display:none;}
@media (min-width:768px){ .header-cta{display:inline-flex;} }

/* ---------- mobile tab ---------- */
.mobile-tab{
  position:fixed;
  left:0;right:0;bottom:0;
  z-index:70;
  display:grid;
  grid-template-columns:repeat(5,1fr);
  height:64px;
  padding-bottom:env(safe-area-inset-bottom);
  background:rgba(10,15,28,0.92);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-top:1px solid var(--line);
}
.tab-item{
  position:relative;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:3px;
  font-size:10px;
  color:var(--text-3);
  transition:color var(--ease);
}
.tab-item svg{width:22px;height:22px;stroke:currentColor;fill:none;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;}
.tab-item::before{
  content:"";
  position:absolute;
  top:0;left:50%;
  transform:translateX(-50%) scaleX(0.3);
  width:22px;height:2px;
  border-radius:2px;
  background:var(--brand-400);
  opacity:0;
  transition:opacity var(--ease), transform var(--ease);
}
.tab-item.active{color:var(--brand-400);}
.tab-item.active::before{opacity:1;transform:translateX(-50%) scaleX(1);}
@media (min-width:768px){ .mobile-tab{display:none;} }

/* ---------- sections ---------- */
.section{padding:56px 0;}
@media (min-width:1024px){ .section{padding:88px 0;} }
.section-dark{background:var(--ink-900);}
.section-head{
  display:flex;
  flex-direction:column;
  gap:8px;
  margin-bottom:28px;
}
@media (min-width:768px){
  .section-head{flex-direction:row;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:36px;}
}
.section-title{
  font-size:clamp(22px,2.4vw,30px);
  font-weight:700;
  letter-spacing:-0.01em;
  line-height:1.35;
}
.section-sub{font-size:14px;color:var(--text-2);}
.text-link{
  display:inline-flex;align-items:center;gap:6px;
  font-size:13px;color:var(--brand-400);
  transition:color var(--ease);
}
.text-link:hover{color:var(--accent-400);}
.text-link svg{width:14px;height:14px;stroke:currentColor;fill:none;stroke-width:2;}

/* ---------- hero ---------- */
.hero{
  position:relative;
  padding:40px 0 56px;
  overflow:hidden;
}
@media (min-width:1024px){ .hero{padding:64px 0 88px;} }
.hero::before{
  content:"";
  position:absolute;
  inset:auto -20% -40% -20%;
  height:520px;
  background:
    radial-gradient(ellipse at 50% 100%, rgba(31,107,255,0.18), transparent 65%);
  pointer-events:none;
}
.hero::after{
  content:"";
  position:absolute;
  inset:0 0 0 0;
  background-image:linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px),
                   linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size:24px 24px;
  -webkit-mask-image:radial-gradient(ellipse at 30% 110%, #000 0%, transparent 62%);
  mask-image:radial-gradient(ellipse at 30% 110%, #000 0%, transparent 62%);
  pointer-events:none;
  opacity:0.8;
}
.hero-grid{
  position:relative;
  z-index:2;
  display:grid;
  gap:40px;
}
@media (min-width:1024px){
  .hero-grid{grid-template-columns:55fr 45fr;gap:56px;align-items:center;}
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  height:30px;
  padding:0 14px;
  border-radius:999px;
  font-size:12px;
  color:var(--brand-400);
  border:1px solid rgba(31,107,255,0.3);
  background:rgba(31,107,255,0.08);
  margin-bottom:20px;
}
.eyebrow .dot{width:6px;height:6px;border-radius:50%;background:var(--signal-500);}
.hero h1{
  font-size:clamp(28px,4.2vw,52px);
  font-weight:700;
  letter-spacing:-0.02em;
  line-height:1.22;
  margin-bottom:16px;
}
.hero-sub{
  font-size:16px;
  color:var(--text-2);
  line-height:1.75;
  max-width:520px;
  margin-bottom:26px;
}
@media (min-width:1024px){ .hero-sub{font-size:18px;} }
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:30px;}
.stat-strip{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:12px;
  max-width:460px;
}
.stat{
  padding:12px 14px;
  border-radius:14px;
  background:var(--ink-800);
  border:1px solid var(--line-soft);
  box-shadow:var(--shadow-card);
}
.stat-num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:19px;font-weight:700;color:var(--accent-400);line-height:1.2;}
.stat-label{font-size:11px;color:var(--text-3);margin-top:2px;}

/* hero visual */
.hero-visual{position:relative;display:flex;justify-content:center;}
.phone-card{
  position:relative;
  width:76vw;
  max-width:330px;
  aspect-ratio:9/16;
  border-radius:var(--radius-phone);
  overflow:hidden;
  background:var(--ink-800);
  border:1px solid rgba(255,255,255,0.1);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  box-shadow:0 30px 80px -40px rgba(0,0,0,1), 0 0 0 1px rgba(255,255,255,0.05) inset;
  scroll-snap-align:start;
}
@media (min-width:1024px){ .phone-card{width:100%;max-width:360px;} }
.phone-card img{width:100%;height:100%;object-fit:cover;}
.phone-mask{
  position:absolute;inset:0;
  background:linear-gradient(180deg, rgba(5,7,14,0.6) 0%, rgba(5,7,14,0.35) 42%, rgba(5,7,14,0.95) 100%);
}
.phone-card::after{
  content:"";
  position:absolute;inset:0;
  border-radius:inherit;
  border:1px solid rgba(255,255,255,0.08);
  background:linear-gradient(180deg, rgba(255,255,255,0.12), transparent 26%);
  pointer-events:none;
}
.play-btn{
  position:absolute;
  top:50%;left:50%;
  transform:translate(-50%,-50%);
  width:56px;height:56px;
  border-radius:50%;
  display:grid;place-items:center;
  background:rgba(31,107,255,0.9);
  box-shadow:0 0 0 1px rgba(255,255,255,0.25), 0 0 34px rgba(31,107,255,0.75);
  transition:transform var(--ease), box-shadow var(--ease);
}
.play-btn:hover{transform:translate(-50%,-50%) scale(1.07);box-shadow:0 0 0 1px rgba(255,255,255,0.4), 0 0 46px rgba(31,107,255,0.9);}
.play-btn svg{width:20px;height:20px;fill:#fff;stroke:none;margin-left:3px;}
.phone-meta{position:absolute;left:0;right:0;bottom:0;padding:16px 16px 18px;}
.phone-title{font-size:15px;font-weight:600;}
.phone-sub{font-size:12px;color:var(--text-2);margin-top:2px;}
.phone-dur{
  position:absolute;right:14px;top:-6px;
  font-size:11px;
  padding:2px 8px;
  border-radius:8px;
  background:rgba(5,7,14,0.8);
  color:var(--text-1);
  border:1px solid var(--line);
}
.mini-card{
  display:none;
  position:absolute;
  width:96px;height:128px;
  border-radius:14px;
  overflow:hidden;
  border:1px solid rgba(255,255,255,0.12);
  box-shadow:0 20px 40px -22px rgba(0,0,0,1);
}
.mini-card img{width:100%;height:100%;object-fit:cover;}
@media (min-width:1024px){
  .mini-card{display:block;}
  .mini-card--left{left:-8px;top:-24px;transform:rotate(-6deg);}
  .mini-card--right{right:-6px;bottom:-24px;transform:rotate(5deg);}
}

/* ---------- clips ---------- */
.clip-track{
  display:flex;
  gap:16px;
  overflow-x:auto;
  scroll-snap-type:x mandatory;
  padding-bottom:8px;
  -webkit-overflow-scrolling:touch;
  scrollbar-width:none;
}
.clip-track::-webkit-scrollbar{display:none;}
.clip-card{
  flex:0 0 76vw;
  scroll-snap-align:start;
  border-radius:20px;
  overflow:hidden;
  background:var(--ink-800);
  border:1px solid var(--line-soft);
  box-shadow:var(--shadow-card);
  transition:transform var(--ease), border-color var(--ease);
}
.clip-card:hover{transform:translateY(-2px);border-color:rgba(77,139,255,0.4);}
@media (min-width:640px){ .clip-card{flex:0 0 240px;} }
@media (min-width:1024px){
  .clip-track{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));overflow:visible;gap:20px;}
  .clip-card{flex:none;}
}
.clip-cover{position:relative;aspect-ratio:9/16;overflow:hidden;background:linear-gradient(180deg,rgba(31,107,255,0.12),transparent);}
.clip-cover img{width:100%;height:100%;object-fit:cover;transition:transform 320ms cubic-bezier(.2,.8,.2,1);}
.clip-card:hover .clip-cover img{transform:scale(1.04);}
.clip-cover::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg, rgba(5,7,14,0.05) 0%, rgba(5,7,14,0.15) 55%, rgba(16,24,39,0.98) 100%);
}
.clip-tag{
  position:absolute;top:12px;left:12px;
  z-index:2;
  font-family:var(--font-mono);
  font-size:11px;
  padding:3px 9px;
  border-radius:999px;
  border:1px solid rgba(43,232,176,0.45);
  color:var(--accent-400);
  background:rgba(5,7,14,0.6);
}
.clip-dur{
  position:absolute;top:12px;right:12px;
  z-index:2;
  font-family:var(--font-mono);
  font-size:11px;
  padding:3px 8px;
  border-radius:8px;
  background:rgba(5,7,14,0.72);
  border:1px solid var(--line);
  color:var(--text-2);
}
.clip-body{padding:14px 14px 16px;}
.clip-title{font-size:15px;font-weight:600;line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.clip-views{font-family:var(--font-mono);font-size:11px;color:var(--text-3);margin-top:6px;}

/* ---------- picks ---------- */
.pick-list{
  border-radius:var(--radius-card);
  background:var(--ink-800);
  border:1px solid var(--line-soft);
  box-shadow:var(--shadow-card);
  overflow:hidden;
}
.pick-item{
  display:grid;
  grid-template-columns:44px 1fr;
  gap:12px;
  align-items:center;
  padding:18px 18px;
  border-bottom:1px solid var(--line-soft);
  transition:background var(--ease);
}
.pick-item:last-child{border-bottom:0;}
.pick-item:hover{background:rgba(31,107,255,0.06);}
@media (min-width:768px){
  .pick-item{grid-template-columns:64px 1fr auto;gap:20px;padding:20px 24px;}
}
.pick-num{
  font-family:var(--font-mono);
  font-size:26px;
  font-weight:700;
  line-height:1;
  color:transparent;
  -webkit-text-stroke:1px rgba(77,139,255,0.75);
}
@media (min-width:768px){ .pick-num{font-size:32px;} }
.pick-title{font-size:15px;font-weight:600;}
.pick-desc{font-size:13px;color:var(--text-2);margin-top:2px;}
.pick-tag{
  display:none;
  font-size:11px;
  padding:4px 12px;
  border-radius:999px;
  color:var(--accent-400);
  border:1px solid rgba(43,232,176,0.3);
  background:rgba(43,232,176,0.06);
  white-space:nowrap;
}
@media (min-width:768px){ .pick-tag{display:inline-flex;} }

/* ---------- reviews ---------- */
.review-track{
  display:flex;
  gap:16px;
  overflow-x:auto;
  scroll-snap-type:x mandatory;
  padding-bottom:8px;
  scrollbar-width:none;
}
.review-track::-webkit-scrollbar{display:none;}
.review-card{
  flex:0 0 78vw;
  scroll-snap-align:start;
  min-height:120px;
  padding:18px;
  border-radius:var(--radius-card);
  background:var(--ink-800);
  border:1px solid var(--line-soft);
  box-shadow:var(--shadow-card);
  display:flex;
  flex-direction:column;
  gap:10px;
}
@media (min-width:768px){
  .review-track{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));overflow:visible;gap:16px;}
  .review-card{flex:none;}
}
.review-top{display:flex;align-items:center;gap:10px;}
.avatar{
  width:34px;height:34px;
  border-radius:50%;
  display:grid;place-items:center;
  font-size:14px;font-weight:700;
  color:#05070E;
  flex:0 0 auto;
}
.avatar--a{background:linear-gradient(135deg,#4D8BFF,#1F6BFF);color:#fff;}
.avatar--b{background:linear-gradient(135deg,#2BE8B0,#17b98b);}
.avatar--c{background:linear-gradient(135deg,#9AA7BE,#64718A);color:#fff;}
.review-name{font-size:13px;font-weight:600;}
.stars{display:inline-flex;gap:2px;margin-left:auto;}
.stars svg{width:12px;height:12px;fill:var(--accent-400);}
.review-text{font-size:14px;color:var(--text-2);line-height:1.72;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.review-time{font-family:var(--font-mono);font-size:11px;color:var(--text-3);margin-top:auto;text-align:right;}

/* ---------- news ---------- */
.news-grid{display:grid;gap:16px;}
@media (min-width:1024px){ .news-grid{grid-template-columns:1.35fr 1fr;gap:20px;} }
.news-main{
  display:flex;
  flex-direction:column;
  border-radius:var(--radius-card);
  overflow:hidden;
  background:var(--ink-800);
  border:1px solid var(--line-soft);
  box-shadow:var(--shadow-card);
  transition:transform var(--ease), border-color var(--ease);
}
.news-main:hover{transform:translateY(-2px);border-color:rgba(77,139,255,0.4);}
.news-main-cover{aspect-ratio:16/9;overflow:hidden;background:var(--ink-900);}
.news-main-cover img{width:100%;height:100%;object-fit:cover;transition:transform 320ms cubic-bezier(.2,.8,.2,1);}
.news-main:hover .news-main-cover img{transform:scale(1.03);}
.news-main-body{padding:20px;display:flex;flex-direction:column;gap:10px;flex:1;}
.news-side{display:grid;gap:16px;}
.news-card{
  display:block;
  padding:18px;
  border-radius:var(--radius-card);
  background:var(--ink-800);
  border:1px solid var(--line-soft);
  box-shadow:var(--shadow-card);
  transition:transform var(--ease), border-color var(--ease);
}
.news-card:hover{transform:translateY(-2px);border-color:rgba(77,139,255,0.4);}
.cat-pill{
  display:inline-flex;
  align-items:center;
  height:22px;
  padding:0 10px;
  font-size:11px;
  border-radius:999px;
  color:var(--brand-400);
  background:rgba(31,107,255,0.1);
  border:1px solid rgba(31,107,255,0.28);
  width:fit-content;
}
.news-title{
  font-size:16px;
  font-weight:600;
  line-height:1.5;
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
}
.news-main .news-title{font-size:20px;}
.news-excerpt{
  font-size:13px;
  color:var(--text-2);
  line-height:1.7;
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
}
.news-meta{
  display:flex;
  align-items:center;
  gap:10px;
  flex-wrap:wrap;
  font-size:12px;
  color:var(--text-3);
  margin-top:auto;
  padding-top:6px;
}
.news-meta time{font-family:var(--font-mono);font-variant-numeric:tabular-nums;}
.news-arrow{margin-left:auto;color:var(--brand-400);}
.news-arrow svg{width:16px;height:16px;stroke:currentColor;fill:none;stroke-width:2;}
.empty-box{
  min-height:160px;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:12px;
  border:1px dashed rgba(255,255,255,0.12);
  border-radius:var(--radius-card);
  color:var(--text-3);
  font-size:13px;
  padding:24px;
  text-align:center;
}

/* ---------- cta ---------- */
.cta-panel{
  position:relative;
  overflow:hidden;
  border-radius:24px;
  padding:28px 22px;
  background:rgba(255,255,255,0.045);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border:1px solid rgba(255,255,255,0.08);
  box-shadow:0 30px 80px -50px rgba(0,0,0,1);
}
.cta-panel::before{
  content:"";
  position:absolute;inset:0;
  background-image:url('/assets/images/backpic/back-2.png');
  background-size:cover;
  background-position:center;
  opacity:0.16;
  pointer-events:none;
}
.cta-panel::after{
  content:"";
  position:absolute;
  right:-60px;bottom:-60px;
  width:180px;height:180px;
  border:1px solid rgba(31,107,255,0.28);
  border-radius:16px;
  transform:rotate(45deg);
  pointer-events:none;
}
.cta-inner{position:relative;z-index:2;display:grid;gap:26px;}
@media (min-width:1024px){ .cta-inner{grid-template-columns:60fr 40fr;gap:40px;align-items:center;} }
.cta-panel h2{font-size:clamp(22px,2.4vw,30px);font-weight:700;margin-bottom:8px;}
.cta-lead{font-size:14px;color:var(--text-2);margin-bottom:22px;}
.steps{display:grid;gap:14px;}
@media (min-width:640px){ .steps{grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;} }
.step{position:relative;padding-top:14px;border-top:1px solid rgba(255,255,255,0.12);}
.step-num{font-family:var(--font-mono);font-size:12px;color:var(--accent-400);}
.step-title{font-size:14px;font-weight:600;margin-top:4px;}
.step-desc{font-size:12px;color:var(--text-3);margin-top:2px;line-height:1.6;}
.cta-actions{display:grid;gap:12px;}
.cta-note{font-size:12px;color:var(--text-3);text-align:center;}

/* ---------- faq ---------- */
.faq-wrap{
  border-radius:var(--radius-card);
  background:var(--ink-800);
  border:1px solid var(--line-soft);
  box-shadow:var(--shadow-card);
  overflow:hidden;
}
.faq-item{border-bottom:1px solid var(--line-soft);}
.faq-item:last-child{border-bottom:0;}
.faq-q{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:18px 20px;
  text-align:left;
  font-size:15px;
  font-weight:600;
  color:var(--text-1);
  transition:color var(--ease), background var(--ease);
}
.faq-q:hover{color:var(--accent-400);background:rgba(31,107,255,0.05);}
.faq-icon{
  flex:0 0 auto;
  width:22px;height:22px;
  display:grid;place-items:center;
  border-radius:50%;
  border:1px solid var(--line);
  color:var(--brand-400);
  font-size:14px;
  line-height:1;
  transition:transform var(--ease), border-color var(--ease);
}
.faq-item.open .faq-icon{transform:rotate(180deg);border-color:rgba(77,139,255,0.6);}
.faq-a{
  display:none;
  padding:0 20px 20px;
  font-size:14px;
  line-height:1.8;
  color:var(--text-2);
  max-width:720px;
}
.faq-item.open .faq-a{display:block;}

/* ---------- footer ---------- */
.site-footer{
  background:var(--ink-900);
  border-top:1px solid var(--line);
  padding:48px 0 28px;
  margin-top:8px;
}
.foot-grid{display:grid;gap:32px;}
@media (min-width:640px){ .foot-grid{grid-template-columns:repeat(2,minmax(0,1fr));} }
@media (min-width:1024px){ .foot-grid{grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px;} }
.foot-title{font-size:13px;font-weight:600;color:var(--brand-400);margin-bottom:14px;letter-spacing:0.02em;}
.foot-desc{font-size:13px;color:var(--text-2);line-height:1.8;max-width:280px;margin-top:12px;}
.foot-links{display:grid;gap:10px;}
.foot-link{font-size:13px;color:var(--text-2);transition:color var(--ease);}
.foot-link:hover{color:var(--accent-400);}
.foot-bottom{
  margin-top:36px;
  padding-top:18px;
  border-top:1px solid var(--line-soft);
  display:flex;
  flex-direction:column;
  gap:8px;
  font-size:12px;
  color:var(--text-3);
}
@media (min-width:768px){ .foot-bottom{flex-direction:row;align-items:center;justify-content:space-between;} }

@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important;scroll-behavior:auto !important;}
  .clip-card:hover,.news-main:hover,.news-card:hover,.btn-primary:hover,.btn-ghost:hover{transform:none;}
}

/* roulang page: category1 */
:root{
    --ink-950:#05070E;
    --ink-900:#0A0F1C;
    --ink-800:#101827;
    --ink-700:rgba(22,32,51,0.75);
    --brand-500:#1F6BFF;
    --brand-400:#4D8BFF;
    --brand-600:#1550CC;
    --accent-400:#2BE8B0;
    --signal-500:#FF5C4D;
    --text:#E9EEF7;
    --text-2:#9AA7BE;
    --text-3:#64718A;
    --line:rgba(255,255,255,0.08);
    --line-strong:rgba(255,255,255,0.14);
    --r-card:18px;
    --r-portrait:24px;
    --r-pill:999px;
    --r-sm:12px;
    --shadow-card:0 12px 32px -18px rgba(0,0,0,0.9);
    --ease:180ms cubic-bezier(.2,.8,.2,1);
    --mono:ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  }

  *,*::before,*::after{box-sizing:border-box}
  html{-webkit-text-size-adjust:100%}
  body{
    margin:0;
    background:var(--ink-950);
    color:var(--text);
    font-family:-apple-system,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",sans-serif;
    font-size:15px;
    line-height:1.7;
    -webkit-font-smoothing:antialiased;
    padding-bottom:84px;
    overflow-x:hidden;
  }
  img{max-width:100%;display:block}
  a{color:inherit;text-decoration:none}
  button{font-family:inherit}
  a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{
    outline:2px solid var(--brand-400);
    outline-offset:2px;
    border-radius:6px;
  }
  ::selection{background:rgba(31,107,255,.35);color:#fff}

  .num{font-family:var(--mono);font-variant-numeric:tabular-nums}

  .container-x{
    width:100%;
    max-width:1200px;
    margin:0 auto;
    padding-left:20px;
    padding-right:20px;
  }
  @media (min-width:768px){
    .container-x{padding-left:28px;padding-right:28px}
  }
  @media (min-width:1024px){
    .container-x{padding-left:40px;padding-right:40px}
    body{padding-bottom:0}
  }

  /* ---------- header ---------- */
  .site-header{
    position:sticky;
    top:0;
    z-index:80;
    background:rgba(5,7,14,0.72);
    -webkit-backdrop-filter:blur(14px);
    backdrop-filter:blur(14px);
    border-bottom:1px solid var(--line);
  }
  .header-inner{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:24px;
    height:64px;
  }
  @media (min-width:1024px){ .header-inner{height:72px} }

  .logo{
    display:inline-flex;
    align-items:center;
    gap:10px;
    color:var(--text);
    flex-shrink:0;
  }
  .logo-mark{
    width:28px;
    height:28px;
    color:var(--brand-400);
    flex-shrink:0;
  }
  @media (min-width:1024px){ .logo-mark{width:32px;height:32px} }
  .logo-text{display:inline-flex;align-items:baseline;gap:5px;line-height:1}
  .logo-cn{font-size:18px;font-weight:700;letter-spacing:-0.02em}
  .logo-en{
    font-size:10px;
    letter-spacing:.18em;
    text-transform:uppercase;
    color:var(--text-3);
  }

  .main-nav{display:none}
  @media (min-width:1024px){
    .main-nav{
      display:flex;
      align-items:center;
      gap:28px;
    }
  }
  .nav-link{
    position:relative;
    font-size:14px;
    color:var(--text-2);
    padding:6px 0;
    transition:color var(--ease);
    white-space:nowrap;
  }
  .nav-link:hover{color:var(--accent-400)}
  .nav-link.active{color:var(--brand-400)}
  .nav-link.active::after{
    content:"";
    position:absolute;
    left:0;right:0;bottom:-4px;
    height:2px;
    border-radius:2px;
    background:var(--brand-400);
  }

  /* ---------- buttons ---------- */
  .btn{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    gap:8px;
    height:44px;
    padding:0 22px;
    border-radius:var(--r-pill);
    font-size:14px;
    font-weight:600;
    border:1px solid transparent;
    cursor:pointer;
    transition:transform var(--ease),box-shadow var(--ease),background var(--ease),color var(--ease),border-color var(--ease);
    white-space:nowrap;
  }
  .btn-primary{
    background:linear-gradient(180deg,var(--brand-400),var(--brand-500));
    color:#fff;
    box-shadow:0 0 0 1px rgba(31,107,255,0.55),0 10px 32px -10px rgba(31,107,255,0.7);
  }
  .btn-primary:hover{
    transform:translateY(-2px);
    box-shadow:0 0 0 1px rgba(31,107,255,0.7),0 12px 36px -6px rgba(31,107,255,0.85);
    filter:brightness(1.06);
  }
  .btn-ghost{
    background:rgba(255,255,255,0.03);
    border-color:var(--line-strong);
    color:var(--text);
  }
  .btn-ghost:hover{
    border-color:rgba(77,139,255,0.55);
    color:var(--accent-400);
    transform:translateY(-2px);
  }
  .btn-sm{
    height:36px;
    padding:0 16px;
    font-size:13px;
  }
  .header-cta{flex-shrink:0}
  @media (min-width:1024px){ .header-cta{height:40px;padding:0 20px} }

  /* ---------- generic surfaces ---------- */
  .panel{
    background:var(--ink-800);
    border:1px solid var(--line);
    border-radius:var(--r-card);
    box-shadow:var(--shadow-card);
  }
  .glass{
    background:rgba(255,255,255,0.045);
    -webkit-backdrop-filter:blur(14px);
    backdrop-filter:blur(14px);
    border:1px solid rgba(255,255,255,0.08);
    border-radius:var(--r-portrait);
    position:relative;
    overflow:hidden;
  }
  .glass::before{
    content:"";
    position:absolute;
    inset:0 0 auto 0;
    height:1px;
    background:linear-gradient(90deg,transparent,rgba(255,255,255,0.35),transparent);
  }
  .grid-tex{
    background-image:
      linear-gradient(rgba(255,255,255,0.05) 1px,transparent 1px),
      linear-gradient(90deg,rgba(255,255,255,0.05) 1px,transparent 1px);
    background-size:24px 24px;
  }
  .glow-brand{
    background:radial-gradient(60% 90% at 50% 100%,rgba(31,107,255,0.18),transparent 70%);
  }

  .badge{
    display:inline-flex;
    align-items:center;
    gap:8px;
    height:30px;
    padding:0 14px;
    border-radius:var(--r-pill);
    font-size:12px;
    letter-spacing:.02em;
    color:var(--brand-400);
    border:1px solid rgba(31,107,255,0.3);
    background:rgba(31,107,255,0.08);
  }
  .dot{
    width:6px;height:6px;border-radius:50%;
    background:var(--signal-500);
    box-shadow:0 0 0 3px rgba(255,92,77,0.18);
  }

  .section{padding-top:56px;padding-bottom:8px}
  @media (min-width:1024px){ .section{padding-top:88px} }
  .section-head{max-width:720px}
  .h2{
    font-size:clamp(22px,3vw,30px);
    font-weight:700;
    letter-spacing:-0.01em;
    line-height:1.3;
    margin:0;
  }
  .sub{
    margin:10px 0 0;
    color:var(--text-2);
    font-size:14px;
  }

  /* ---------- hero ---------- */
  .hero{
    position:relative;
    padding-top:36px;
    padding-bottom:56px;
    overflow:hidden;
  }
  @media (min-width:1024px){ .hero{padding-top:56px;padding-bottom:88px} }
  .hero-bg{
    position:absolute;
    inset:0;
    background-image:url('/assets/images/backpic/back-1.png');
    background-size:cover;
    background-position:center;
    opacity:.16;
    pointer-events:none;
  }
  .hero::after{
    content:"";
    position:absolute;
    inset:auto 0 0 0;
    height:70%;
    background:radial-gradient(55% 80% at 30% 100%,rgba(31,107,255,0.16),transparent 70%);
    pointer-events:none;
  }
  .hero-grid{
    position:relative;
    display:grid;
    gap:36px;
    align-items:center;
  }
  @media (min-width:1024px){
    .hero-grid{grid-template-columns:55fr 45fr;gap:48px}
  }
  .hero h1{
    margin:18px 0 0;
    font-size:clamp(28px,4.2vw,52px);
    font-weight:700;
    letter-spacing:-0.02em;
    line-height:1.16;
  }
  .hero h1 .kw{color:var(--brand-400)}
  .hero-lead{
    margin:16px 0 0;
    font-size:16px;
    color:var(--text-2);
    max-width:520px;
  }
  @media (min-width:1024px){ .hero-lead{font-size:18px} }
  .hero-actions{
    display:flex;
    flex-wrap:wrap;
    gap:12px;
    margin-top:26px;
  }
  .hero-stats{
    display:grid;
    grid-template-columns:repeat(3,minmax(0,1fr));
    gap:12px;
    margin-top:30px;
    max-width:520px;
  }
  .stat{
    border:1px solid var(--line);
    border-radius:var(--r-sm);
    background:rgba(255,255,255,0.02);
    padding:12px 14px;
  }
  .stat-num{
    font-family:var(--mono);
    font-variant-numeric:tabular-nums;
    font-size:20px;
    font-weight:700;
    color:var(--accent-400);
    line-height:1.1;
  }
  .stat-label{
    display:block;
    margin-top:6px;
    font-size:12px;
    color:var(--text-3);
  }

  .hero-visual{position:relative}
  .portrait-card{
    position:relative;
    width:100%;
    aspect-ratio:9/16;
    max-height:520px;
    border-radius:var(--r-portrait);
    overflow:hidden;
    border:1px solid rgba(255,255,255,0.1);
    box-shadow:0 24px 60px -30px rgba(0,0,0,0.95);
  }
  .portrait-card img{
    width:100%;height:100%;object-fit:cover;
  }
  .portrait-card::after{
    content:"";
    position:absolute;inset:0;
    background:linear-gradient(180deg,rgba(5,7,14,.35),rgba(5,7,14,.55) 45%,rgba(5,7,14,.95));
  }
  .portrait-inner{
    position:absolute;
    inset:auto 0 0 0;
    padding:18px;
    z-index:2;
  }
  .portrait-tag{
    position:absolute;
    top:16px;left:16px;
    z-index:2;
    display:inline-flex;
    align-items:center;
    gap:6px;
    height:26px;
    padding:0 10px;
    border-radius:var(--r-pill);
    font-size:11px;
    font-family:var(--mono);
    color:var(--text);
    background:rgba(5,7,14,.6);
    border:1px solid var(--line-strong);
  }
  .portrait-time{
    position:absolute;
    top:16px;right:16px;
    z-index:2;
    font-size:11px;
    font-family:var(--mono);
    padding:3px 8px;
    border-radius:6px;
    background:rgba(5,7,14,.7);
    color:var(--text-2);
    border:1px solid var(--line);
  }
  .portrait-title{
    font-size:15px;
    font-weight:600;
    margin:0;
    line-height:1.4;
  }
  .portrait-meta{
    margin:6px 0 0;
    font-size:12px;
    color:var(--text-3);
    font-family:var(--mono);
  }
  .play-btn{
    position:absolute;
    top:50%;left:50%;
    transform:translate(-50%,-50%);
    width:56px;height:56px;
    border-radius:50%;
    border:1px solid rgba(255,255,255,0.3);
    background:rgba(31,107,255,0.35);
    -webkit-backdrop-filter:blur(8px);
    backdrop-filter:blur(8px);
    display:flex;align-items:center;justify-content:center;
    z-index:2;
    box-shadow:0 0 0 8px rgba(31,107,255,0.12),0 0 32px rgba(31,107,255,0.55);
  }
  .play-btn svg{width:20px;height:20px;color:#fff;margin-left:2px}
  @media (min-width:1024px){
    .hero-visual{max-width:400px;margin-left:auto}
  }

  /* ---------- timeline ---------- */
  .timeline{
    margin-top:34px;
    position:relative;
  }
  .tl-item{
    position:relative;
    display:grid;
    grid-template-columns:56px minmax(0,1fr);
    gap:18px;
    padding-bottom:34px;
  }
  .tl-item:last-child{padding-bottom:0}
  .tl-item::before{
    content:"";
    position:absolute;
    left:27px;
    top:52px;
    bottom:6px;
    width:1px;
    background:linear-gradient(180deg,rgba(31,107,255,0.5),rgba(31,107,255,0.06));
  }
  .tl-item:last-child::before{display:none}
  .tl-num{
    font-family:var(--mono);
    font-variant-numeric:tabular-nums;
    font-size:26px;
    font-weight:700;
    line-height:1;
    color:transparent;
    -webkit-text-stroke:1px rgba(31,107,255,0.75);
    padding-top:8px;
    position:relative;
    z-index:2;
    background:var(--ink-950);
    height:44px;
  }
  .tl-body{
    background:var(--ink-800);
    border:1px solid var(--line);
    border-radius:var(--r-card);
    padding:18px 20px;
    box-shadow:var(--shadow-card);
    transition:border-color var(--ease),transform var(--ease);
  }
  .tl-body:hover{
    border-color:rgba(77,139,255,0.4);
    transform:translateY(-2px);
  }
  .tl-title{
    margin:0;
    font-size:17px;
    font-weight:600;
    line-height:1.4;
  }
  .tl-text{
    margin:8px 0 0;
    font-size:14px;
    color:var(--text-2);
  }
  .tl-note{
    display:inline-flex;
    align-items:center;
    gap:6px;
    margin-top:12px;
    font-size:12px;
    color:var(--accent-400);
    border:1px solid rgba(43,232,176,0.28);
    background:rgba(43,232,176,0.07);
    border-radius:var(--r-pill);
    padding:3px 10px;
  }

  /* ---------- checklist board ---------- */
  .two-col{
    display:grid;
    gap:24px;
    margin-top:34px;
  }
  @media (min-width:1024px){
    .two-col{grid-template-columns:minmax(0,0.95fr) minmax(0,1.05fr);gap:40px;align-items:center}
  }
  .shot{
    position:relative;
    border-radius:var(--r-card);
    overflow:hidden;
    border:1px solid var(--line);
    aspect-ratio:16/11;
    box-shadow:var(--shadow-card);
  }
  .shot img{width:100%;height:100%;object-fit:cover}
  .shot figcaption{
    position:absolute;
    left:0;right:0;bottom:0;
    padding:14px 16px;
    font-size:12px;
    color:var(--text-2);
    background:linear-gradient(180deg,transparent,rgba(5,7,14,0.92));
  }
  .list-line{
    display:grid;
    grid-template-columns:42px minmax(0,1fr) auto;
    align-items:center;
    gap:14px;
    padding:16px 4px;
    border-bottom:1px solid var(--line);
    transition:background var(--ease);
    border-radius:8px;
  }
  .list-line:last-child{border-bottom:none}
  .list-line:hover{background:rgba(31,107,255,0.06)}
  .list-idx{
    font-family:var(--mono);
    font-size:15px;
    color:var(--accent-400);
    border:1px solid rgba(43,232,176,0.3);
    border-radius:8px;
    width:34px;height:34px;
    display:flex;align-items:center;justify-content:center;
  }
  .list-title{
    margin:0;
    font-size:15.5px;
    font-weight:600;
    line-height:1.4;
  }
  .list-desc{
    margin:4px 0 0;
    font-size:13px;
    color:var(--text-2);
  }
  .list-tag{
    font-size:11px;
    color:var(--text-3);
    border:1px solid var(--line-strong);
    border-radius:var(--r-pill);
    padding:3px 10px;
    white-space:nowrap;
  }

  /* ---------- form ---------- */
  .form-wrap{
    display:grid;
    gap:24px;
    margin-top:34px;
  }
  @media (min-width:1024px){
    .form-wrap{grid-template-columns:minmax(0,1.1fr) minmax(0,0.9fr);gap:32px;align-items:start}
  }
  .form-card{
    background:var(--ink-800);
    border:1px solid var(--line);
    border-radius:var(--r-card);
    padding:24px;
    box-shadow:var(--shadow-card);
  }
  .field{margin-bottom:18px}
  .field:last-of-type{margin-bottom:0}
  .field label{
    display:block;
    font-size:13px;
    color:var(--text-2);
    margin-bottom:8px;
  }
  .input,.select,.textarea{
    width:100%;
    height:44px;
    padding:0 14px;
    border-radius:var(--r-sm);
    background:var(--ink-900);
    border:1px solid var(--line-strong);
    color:var(--text);
    font-size:14px;
    transition:border-color var(--ease),box-shadow var(--ease);
  }
  .textarea{height:auto;padding:12px 14px;min-height:110px;resize:vertical;line-height:1.7}
  .select{
    appearance:none;
    background-image:linear-gradient(45deg,transparent 50%,var(--text-3) 50%),linear-gradient(135deg,var(--text-3) 50%,transparent 50%);
    background-position:calc(100% - 20px) 19px,calc(100% - 14px) 19px;
    background-size:6px 6px,6px 6px;
    background-repeat:no-repeat;
  }
  .input::placeholder,.textarea::placeholder{color:var(--text-3)}
  .input:focus,.select:focus,.textarea:focus{
    border-color:rgba(31,107,255,0.6);
    box-shadow:0 0 0 2px rgba(31,107,255,0.22);
    outline:none;
  }
  .form-tip{
    margin:14px 0 0;
    font-size:12px;
    color:var(--text-3);
    line-height:1.7;
  }
  .tips-card{
    background:var(--ink-900);
    border:1px solid var(--line);
    border-radius:var(--r-card);
    padding:24px;
  }
  .tips-card h3{
    margin:0 0 14px;
    font-size:16px;
    font-weight:600;
  }
  .tips-card ul{margin:0;padding:0;list-style:none}
  .tips-card li{
    position:relative;
    padding-left:20px;
    font-size:13.5px;
    color:var(--text-2);
    margin-bottom:12px;
    line-height:1.75;
  }
  .tips-card li:last-child{margin-bottom:0}
  .tips-card li::before{
    content:"";
    position:absolute;
    left:0;top:9px;
    width:6px;height:6px;
    border-radius:2px;
    background:var(--accent-400);
    transform:rotate(45deg);
  }

  /* ---------- faq ---------- */
  .faq-list{
    margin-top:30px;
    background:var(--ink-800);
    border:1px solid var(--line);
    border-radius:var(--r-card);
    overflow:hidden;
    box-shadow:var(--shadow-card);
  }
  .faq-item + .faq-item{border-top:1px solid var(--line)}
  .faq-q{
    width:100%;
    background:transparent;
    border:0;
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:16px;
    padding:18px 20px;
    text-align:left;
    color:var(--text);
    font-size:15px;
    font-weight:500;
    cursor:pointer;
    transition:background var(--ease),color var(--ease);
  }
  .faq-q:hover{background:rgba(31,107,255,0.06);color:var(--accent-400)}
  .faq-icon{
    flex-shrink:0;
    width:22px;height:22px;
    display:flex;align-items:center;justify-content:center;
    color:var(--brand-400);
    font-family:var(--mono);
    font-size:16px;
    transition:transform var(--ease);
  }
  .faq-item.open .faq-icon{transform:rotate(180deg)}
  .faq-a{
    display:none;
    padding:0 20px 20px;
    max-width:720px;
    font-size:14px;
    line-height:1.8;
    color:var(--text-2);
  }
  .faq-item.open .faq-a{display:block}

  /* ---------- cta ---------- */
  .cta-panel{
    margin-top:56px;
    padding:32px 24px;
    position:relative;
  }
  @media (min-width:1024px){
    .cta-panel{margin-top:88px;padding:44px}
  }
  .cta-bg{
    position:absolute;inset:0;
    background-image:url('/assets/images/backpic/back-2.png');
    background-size:cover;
    background-position:center;
    opacity:.1;
    pointer-events:none;
  }
  .cta-inner{
    position:relative;
    display:grid;
    gap:28px;
  }
  @media (min-width:1024px){
    .cta-inner{grid-template-columns:60fr 40fr;gap:40px;align-items:center}
  }
  .steps-row{
    display:grid;
    gap:16px;
    margin-top:26px;
  }
  @media (min-width:640px){
    .steps-row{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
  }
  .step{
    position:relative;
    padding-top:14px;
    border-top:1px solid rgba(255,255,255,0.14);
  }
  .step-no{
    font-family:var(--mono);
    font-size:12px;
    color:var(--accent-400);
    letter-spacing:.1em;
  }
  .step-name{
    margin:6px 0 0;
    font-size:14.5px;
    font-weight:600;
  }
  .step-desc{
    margin:6px 0 0;
    font-size:12px;
    color:var(--text-3);
    line-height:1.6;
  }
  .cta-actions{
    display:flex;
    flex-direction:column;
    gap:12px;
  }
  .cta-actions .btn{width:100%}
  .cta-hint{
    margin:4px 0 0;
    font-size:12px;
    color:var(--text-3);
    text-align:center;
  }
  .diamond{
    position:absolute;
    right:22px;bottom:22px;
    width:56px;height:56px;
    border:1px solid rgba(31,107,255,0.28);
    transform:rotate(45deg);
    border-radius:10px;
    pointer-events:none;
  }

  /* ---------- footer ---------- */
  .site-footer{
    margin-top:64px;
    border-top:1px solid var(--line);
    background:var(--ink-900);
    padding:44px 0 28px;
  }
  @media (min-width:1024px){ .site-footer{margin-top:96px;padding:56px 0 32px} }
  .foot-grid{
    display:grid;
    gap:32px;
    grid-template-columns:1fr;
  }
  @media (min-width:640px){ .foot-grid{grid-template-columns:1fr 1fr} }
  @media (min-width:1024px){ .foot-grid{grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px} }
  .foot-desc{
    margin:14px 0 0;
    font-size:13px;
    color:var(--text-3);
    line-height:1.8;
    max-width:300px;
  }
  .foot-title{
    margin:0 0 14px;
    font-size:13px;
    font-weight:600;
    color:var(--brand-400);
    letter-spacing:.02em;
  }
  .foot-links{display:flex;flex-direction:column;gap:10px}
  .foot-link{
    font-size:13px;
    color:var(--text-2);
    transition:color var(--ease);
    line-height:1.6;
  }
  .foot-link:hover{color:var(--accent-400)}
  .foot-bottom{
    margin-top:34px;
    padding-top:18px;
    border-top:1px solid var(--line);
    display:flex;
    flex-wrap:wrap;
    gap:10px 20px;
    justify-content:space-between;
    font-size:12px;
    color:var(--text-3);
  }

  /* ---------- mobile tab ---------- */
  .mobile-tab{
    position:fixed;
    left:0;right:0;bottom:0;
    z-index:90;
    height:64px;
    padding-bottom:env(safe-area-inset-bottom);
    background:rgba(10,15,28,0.92);
    -webkit-backdrop-filter:blur(14px);
    backdrop-filter:blur(14px);
    border-top:1px solid var(--line);
    display:grid;
    grid-template-columns:repeat(5,1fr);
    align-items:center;
  }
  @media (min-width:1024px){ .mobile-tab{display:none} }
  .tab-item{
    position:relative;
    display:flex;
    flex-direction:column;
    align-items:center;
    justify-content:center;
    gap:3px;
    height:100%;
    font-size:10px;
    color:var(--text-3);
    transition:color var(--ease);
  }
  .tab-item svg{width:20px;height:20px}
  .tab-item.active{color:var(--brand-400)}
  .tab-item.active::before{
    content:"";
    position:absolute;
    top:0;
    left:50%;
    transform:translateX(-50%);
    width:22px;height:2px;
    border-radius:2px;
    background:var(--brand-400);
  }
  .tab-item:hover{color:var(--brand-400)}

  @media (prefers-reduced-motion:reduce){
    *{animation:none!important;transition:none!important}
    .btn:hover,.tl-body:hover{transform:none}
  }

/* roulang page: article */
:root{
    --ink-950:#05070E;
    --ink-900:#0A0F1C;
    --ink-800:#101827;
    --line:rgba(255,255,255,.08);
    --line-soft:rgba(255,255,255,.06);
    --brand-500:#1F6BFF;
    --brand-400:#4D8BFF;
    --brand-600:#1550CC;
    --accent-400:#2BE8B0;
    --signal-500:#FF5C4D;
    --t1:#E9EEF7;
    --t2:#9AA7BE;
    --t3:#64718A;
    --r-card:18px;
    --r-vcard:24px;
    --r-btn:999px;
    --r-in:12px;
    --tr:180ms cubic-bezier(.2,.8,.2,1);
    --mono:ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  }

  *,*::before,*::after{box-sizing:border-box}
  html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
  body{
    margin:0;
    background:var(--ink-950);
    color:var(--t1);
    font-family:-apple-system,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",sans-serif;
    font-size:16px;
    line-height:1.6;
    -webkit-font-smoothing:antialiased;
  }
  img{display:block;max-width:100%;height:auto}
  a{color:inherit;text-decoration:none}
  button{font:inherit;color:inherit;cursor:pointer}
  ul,ol{margin:0;padding:0;list-style:none}
  h1,h2,h3,h4,p{margin:0}
  :focus-visible{outline:2px solid var(--brand-400);outline-offset:2px;border-radius:4px}

  .container-x{
    width:100%;
    max-width:1200px;
    margin:0 auto;
    padding-left:20px;
    padding-right:20px;
  }
  @media (min-width:768px){ .container-x{padding-left:28px;padding-right:28px} }
  @media (min-width:1024px){ .container-x{padding-left:40px;padding-right:40px} }

  .mono{font-family:var(--mono);font-variant-numeric:tabular-nums}

  /* ---------- header ---------- */
  .site-header{
    position:sticky;
    top:0;
    z-index:60;
    background:rgba(5,7,14,.72);
    -webkit-backdrop-filter:blur(14px);
    backdrop-filter:blur(14px);
    border-bottom:1px solid var(--line-soft);
  }
  .header-inner{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:20px;
    height:64px;
  }
  .logo{display:inline-flex;align-items:center;gap:10px;color:var(--t1);flex:0 0 auto}
  .logo-mark{width:30px;height:30px;color:var(--brand-400);flex:0 0 auto}
  .logo-text{display:inline-flex;align-items:baseline;gap:6px;line-height:1}
  .logo-cn{font-size:16px;font-weight:700;letter-spacing:.06em}
  .logo-en{font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--brand-400);font-family:var(--mono)}
  .main-nav{display:flex;align-items:center;gap:28px}
  .nav-link{
    position:relative;
    font-size:14px;
    color:var(--t2);
    padding:6px 0;
    transition:color var(--tr);
    white-space:nowrap;
  }
  .nav-link::after{
    content:"";
    position:absolute;
    left:0;right:0;bottom:-2px;
    height:2px;
    border-radius:2px;
    background:var(--brand-400);
    transform:scaleX(0);
    transform-origin:left center;
    transition:transform var(--tr);
  }
  .nav-link:hover{color:var(--accent-400)}
  .nav-link.active{color:var(--brand-400)}
  .nav-link.active::after{transform:scaleX(1)}

  .btn{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    gap:8px;
    border-radius:var(--r-btn);
    border:1px solid transparent;
    font-size:14px;
    font-weight:600;
    padding:12px 24px;
    line-height:1;
    transition:transform var(--tr),box-shadow var(--tr),background var(--tr),color var(--tr),border-color var(--tr);
    white-space:nowrap;
  }
  .btn-primary{
    background:linear-gradient(180deg,#3B84FF,#1550CC);
    color:#fff;
    box-shadow:0 0 0 1px rgba(31,107,255,.55),0 10px 32px -10px rgba(31,107,255,.7);
  }
  .btn-primary:hover{
    transform:translateY(-1px);
    box-shadow:0 0 0 1px rgba(77,139,255,.85),0 14px 40px -6px rgba(31,107,255,.85);
    filter:brightness(1.06);
  }
  .btn-ghost{
    background:rgba(255,255,255,.03);
    border-color:rgba(255,255,255,.14);
    color:var(--t1);
  }
  .btn-ghost:hover{
    background:rgba(31,107,255,.12);
    border-color:rgba(77,139,255,.6);
    color:#fff;
  }
  .btn-sm{height:36px;padding:0 16px;font-size:13px}
  .btn-block{width:100%}

  /* ---------- article head ---------- */
  .article-head{padding-top:24px}
  .crumb{padding:4px 0 18px}
  .crumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:12px;color:var(--t3)}
  .crumb li{display:inline-flex;align-items:center;gap:8px}
  .crumb li+li::before{
    content:"";
    width:0;height:0;
    border-left:5px solid rgba(77,139,255,.7);
    border-top:4px solid transparent;
    border-bottom:4px solid transparent;
  }
  .crumb a{color:var(--t3);transition:color var(--tr)}
  .crumb a:hover{color:var(--accent-400)}
  .crumb [aria-current]{color:var(--t2)}

  .article-banner{
    position:relative;
    overflow:hidden;
    border-radius:var(--r-vcard);
    border:1px solid var(--line);
    padding:34px 26px 30px;
    background-image:linear-gradient(180deg,rgba(5,7,14,.62),rgba(5,7,14,.95)),url('/assets/images/backpic/back-1.png');
    background-size:cover;
    background-position:center;
  }
  .article-banner::after{
    content:"";
    position:absolute;
    inset:auto -60px -120px auto;
    width:320px;height:320px;
    background:radial-gradient(circle,rgba(31,107,255,.18),transparent 68%);
    pointer-events:none;
  }
  @media (min-width:768px){
    .article-banner{padding:46px 42px 40px}
  }
  .tag-pill{
    display:inline-flex;
    align-items:center;
    gap:8px;
    height:28px;
    padding:0 14px;
    border-radius:999px;
    border:1px solid rgba(77,139,255,.42);
    background:rgba(31,107,255,.12);
    color:var(--brand-400);
    font-size:12px;
    letter-spacing:.04em;
  }
  .tag-pill::before{
    content:"";
    width:6px;height:6px;border-radius:50%;
    background:var(--signal-500);
    box-shadow:0 0 8px rgba(255,92,77,.9);
  }
  .article-title{
    margin-top:18px;
    font-size:clamp(26px,4vw,42px);
    font-weight:700;
    letter-spacing:-.02em;
    line-height:1.28;
    color:var(--t1);
    max-width:900px;
  }
  .article-lead{
    margin-top:14px;
    font-size:15px;
    line-height:1.8;
    color:var(--t2);
    max-width:720px;
  }
  .meta-bar{
    display:flex;
    flex-wrap:wrap;
    align-items:center;
    gap:10px 18px;
    margin-top:22px;
    padding-top:18px;
    border-top:1px solid var(--line-soft);
    font-size:12px;
    color:var(--t3);
    font-family:var(--mono);
    font-variant-numeric:tabular-nums;
  }
  .meta-bar .dot{width:4px;height:4px;border-radius:50%;background:var(--t3);opacity:.6}
  .meta-bar strong{color:var(--t2);font-weight:600}

  /* ---------- article layout ---------- */
  .article-body{padding-top:32px}
  .article-grid{display:grid;grid-template-columns:1fr;gap:28px}
  @media (min-width:1024px){
    .article-grid{grid-template-columns:minmax(0,1fr) 240px;gap:44px;align-items:start}
  }
  .cover-figure{
    margin:0 0 26px;
    border-radius:var(--r-card);
    overflow:hidden;
    border:1px solid var(--line);
    background:var(--ink-800);
    aspect-ratio:16/8;
    box-shadow:0 12px 32px -18px rgba(0,0,0,.9);
  }
  .cover-figure img{width:100%;height:100%;object-fit:cover}

  .prose{
    max-width:760px;
    font-size:16px;
    line-height:1.85;
    color:#D6DEEC;
    word-break:break-word;
  }
  .prose p{margin:0 0 18px}
  .prose h2{
    font-size:clamp(22px,2.4vw,28px);
    font-weight:700;
    letter-spacing:-.01em;
    color:var(--t1);
    margin:38px 0 16px;
    line-height:1.4;
  }
  .prose h3{
    font-size:18px;
    font-weight:700;
    color:var(--t1);
    margin:28px 0 12px;
    line-height:1.5;
  }
  .prose h2:first-child,.prose h3:first-child{margin-top:0}
  .prose ul,.prose ol{margin:0 0 18px;padding-left:22px}
  .prose ul{list-style:disc}
  .prose ol{list-style:decimal}
  .prose li{margin:8px 0}
  .prose ul li::marker{color:var(--brand-400)}
  .prose ol li::marker{color:var(--brand-400);font-family:var(--mono)}
  .prose blockquote{
    margin:22px 0;
    padding:14px 20px;
    border-left:3px solid var(--brand-500);
    background:rgba(31,107,255,.07);
    border-radius:0 12px 12px 0;
    color:var(--t2);
  }
  .prose blockquote p:last-child{margin-bottom:0}
  .prose img{
    width:100%;
    border-radius:14px;
    border:1px solid rgba(255,255,255,.08);
    margin:22px 0;
  }
  .prose a{color:var(--brand-400);border-bottom:1px solid rgba(77,139,255,.35);transition:color var(--tr),border-color var(--tr)}
  .prose a:hover{color:var(--accent-400);border-color:rgba(43,232,176,.6)}
  .prose strong{color:#fff}
  .prose code{
    font-family:var(--mono);
    font-size:14px;
    background:rgba(255,255,255,.06);
    border:1px solid var(--line-soft);
    padding:2px 6px;
    border-radius:6px;
    color:var(--accent-400);
  }
  .prose pre{
    background:#070A12;
    border:1px solid var(--line);
    border-radius:14px;
    padding:16px 18px;
    overflow:auto;
    margin:0 0 18px;
    line-height:1.7;
  }
  .prose pre code{background:none;border:0;padding:0;color:#C8D6EE}
  .prose hr{border:0;border-top:1px solid var(--line);margin:30px 0}
  .prose table{width:100%;border-collapse:collapse;margin:0 0 18px;font-size:14px}
  .prose th,.prose td{border:1px solid var(--line);padding:10px 12px;text-align:left}
  .prose th{background:rgba(255,255,255,.04);color:var(--t1);font-weight:600}

  .empty-note{
    border:1px dashed rgba(255,255,255,.14);
    border-radius:var(--r-card);
    padding:44px 24px;
    text-align:center;
    background:var(--ink-800);
  }
  .empty-note p{color:var(--t2);font-size:15px;margin-bottom:18px}

  /* ---------- sidebar ---------- */
  .side-col{display:grid;gap:16px}
  @media (min-width:1024px){
    .side-col{position:sticky;top:88px}
  }
  .side-card{
    background:var(--ink-800);
    border:1px solid var(--line);
    border-radius:var(--r-card);
    padding:20px;
    box-shadow:0 12px 32px -18px rgba(0,0,0,.9),inset 0 1px 0 rgba(255,255,255,.04);
  }
  .side-title{
    font-size:13px;
    font-weight:700;
    letter-spacing:.06em;
    color:var(--t2);
    margin-bottom:14px;
    display:flex;
    align-items:center;
    gap:8px;
  }
  .side-title::before{content:"";width:14px;height:2px;border-radius:2px;background:var(--brand-400)}
  .side-list li+li{margin-top:12px;padding-top:12px;border-top:1px solid var(--line-soft)}
  .side-link{
    display:flex;
    gap:10px;
    font-size:13px;
    line-height:1.6;
    color:var(--t2);
    transition:color var(--tr),transform var(--tr);
  }
  .side-link:hover{color:var(--accent-400);transform:translateX(2px)}
  .side-link .idx{
    font-family:var(--mono);
    font-size:11px;
    color:var(--brand-400);
    border:1px solid rgba(77,139,255,.35);
    border-radius:6px;
    padding:0 5px;
    height:18px;
    display:inline-flex;
    align-items:center;
    flex:0 0 auto;
    margin-top:1px;
  }
  .side-note{font-size:13px;line-height:1.8;color:var(--t3)}
  .side-note strong{color:var(--t2);font-weight:600}

  /* ---------- related ---------- */
  .related{
    margin-top:38px;
    padding-top:24px;
    border-top:1px solid var(--line);
  }
  .related h2{
    font-size:15px;
    font-weight:700;
    letter-spacing:.04em;
    color:var(--t2);
    margin-bottom:16px;
  }
  .related-list li+li{margin-top:12px}
  .related-link{
    display:flex;
    align-items:baseline;
    gap:12px;
    font-size:14px;
    color:var(--t2);
    transition:color var(--tr),transform var(--tr);
  }
  .related-link:hover{color:var(--accent-400);transform:translateX(3px)}
  .related-link .num{font-family:var(--mono);font-size:12px;color:var(--t3)}
  .related-link .arrow{margin-left:auto;color:var(--brand-400)}

  /* ---------- section common ---------- */
  .section{padding-top:56px}
  @media (min-width:1024px){ .section{padding-top:88px} }
  .section-head{margin-bottom:26px}
  .section-kicker{
    display:inline-flex;
    align-items:center;
    gap:8px;
    font-size:12px;
    letter-spacing:.12em;
    text-transform:uppercase;
    color:var(--brand-400);
    font-family:var(--mono);
    margin-bottom:10px;
  }
  .section-kicker::before{content:"";width:20px;height:1px;background:rgba(77,139,255,.7)}
  .section-title{
    font-size:clamp(22px,2.6vw,30px);
    font-weight:700;
    letter-spacing:-.015em;
    color:var(--t1);
  }
  .section-sub{margin-top:8px;font-size:14px;color:var(--t3);max-width:640px}

  /* ---------- checklist ---------- */
  .check-list{
    background:var(--ink-800);
    border:1px solid var(--line);
    border-radius:var(--r-card);
    overflow:hidden;
    box-shadow:0 12px 32px -18px rgba(0,0,0,.9);
  }
  .check-item{
    display:grid;
    grid-template-columns:56px minmax(0,1fr) auto;
    align-items:center;
    gap:16px;
    padding:20px 20px;
    border-bottom:1px solid var(--line-soft);
    transition:background var(--tr);
  }
  .check-item:last-child{border-bottom:0}
  .check-item:hover{background:rgba(31,107,255,.06)}
  .check-num{
    font-family:var(--mono);
    font-size:26px;
    font-weight:700;
    color:transparent;
    -webkit-text-stroke:1px rgba(77,139,255,.75);
    letter-spacing:-.02em;
    line-height:1;
  }
  .check-title{font-size:15px;font-weight:600;color:var(--t1)}
  .check-desc{margin-top:6px;font-size:13px;line-height:1.7;color:var(--t3)}
  .check-badge{
    font-size:11px;
    color:var(--accent-400);
    border:1px solid rgba(43,232,176,.35);
    background:rgba(43,232,176,.08);
    border-radius:999px;
    padding:4px 10px;
    white-space:nowrap;
  }
  @media (max-width:640px){
    .check-item{grid-template-columns:44px minmax(0,1fr);gap:12px;padding:18px 16px}
    .check-badge{grid-column:2;justify-self:start;margin-top:2px}
    .check-num{font-size:22px}
  }

  /* ---------- FAQ ---------- */
  .faq-panel-wrap{
    background:var(--ink-800);
    border:1px solid var(--line);
    border-radius:var(--r-card);
    padding:6px 22px;
    box-shadow:0 12px 32px -18px rgba(0,0,0,.9);
  }
  .faq-item{border-bottom:1px solid var(--line-soft)}
  .faq-item:last-child{border-bottom:0}
  .faq-btn{
    width:100%;
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:18px;
    padding:18px 0;
    background:none;
    border:0;
    text-align:left;
    font-size:15px;
    color:var(--t1);
    transition:color var(--tr);
  }
  .faq-btn:hover{color:var(--brand-400)}
  .faq-ico{
    flex:0 0 auto;
    width:20px;height:20px;
    display:inline-flex;align-items:center;justify-content:center;
    color:var(--brand-400);
    transition:transform var(--tr);
  }
  .faq-item.open .faq-ico{transform:rotate(45deg)}
  .faq-body{
    max-height:0;
    overflow:hidden;
    transition:max-height .28s ease;
  }
  .faq-inner{
    padding:0 0 18px;
    font-size:14px;
    line-height:1.85;
    color:var(--t2);
    max-width:720px;
  }

  /* ---------- CTA ---------- */
  .cta-panel{
    position:relative;
    overflow:hidden;
    border-radius:var(--r-vcard);
    border:1px solid rgba(255,255,255,.08);
    background:rgba(255,255,255,.045);
    -webkit-backdrop-filter:blur(14px);
    backdrop-filter:blur(14px);
    padding:32px 22px;
    display:grid;
    gap:28px;
  }
  .cta-panel::before{
    content:"";
    position:absolute;
    inset:0;
    background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
    background-size:24px 24px;
    opacity:.5;
    mask-image:linear-gradient(180deg,transparent,#000 60%,transparent);
    -webkit-mask-image:linear-gradient(180deg,transparent,#000 60%,transparent);
    pointer-events:none;
  }
  .cta-panel::after{
    content:"";
    position:absolute;
    right:-80px;bottom:-120px;
    width:320px;height:320px;
    background:radial-gradient(circle,rgba(31,107,255,.22),transparent 70%);
    pointer-events:none;
  }
  @media (min-width:1024px){
    .cta-panel{grid-template-columns:1.4fr .85fr;padding:46px 44px;align-items:center;gap:44px}
  }
  .cta-panel > *{position:relative;z-index:1}
  .cta-title{
    font-size:clamp(22px,2.6vw,30px);
    font-weight:700;
    letter-spacing:-.015em;
    color:var(--t1);
  }
  .cta-sub{margin-top:10px;font-size:14px;color:var(--t2);line-height:1.8;max-width:520px}
  .steps{
    display:grid;
    grid-template-columns:1fr;
    gap:16px;
    margin-top:26px;
  }
  @media (min-width:640px){
    .steps{grid-template-columns:repeat(3,1fr);gap:14px}
  }
  .step{
    position:relative;
    padding-top:16px;
    border-top:1px solid rgba(255,255,255,.14);
  }
  .step::before{
    content:"";
    position:absolute;
    left:0;top:-1px;
    width:34px;height:2px;
    background:var(--accent-400);
    border-radius:2px;
  }
  .step-num{font-family:var(--mono);font-size:12px;color:var(--accent-400);letter-spacing:.08em}
  .step-name{margin-top:6px;font-size:14px;font-weight:600;color:var(--t1)}
  .step-desc{margin-top:6px;font-size:12px;line-height:1.7;color:var(--t3)}
  .cta-actions{display:grid;gap:12px}
  .cta-hint{font-size:12px;color:var(--t3);line-height:1.7}
  .diamond-deco{
    position:absolute;
    right:26px;bottom:22px;
    width:64px;height:64px;
    border:1px solid rgba(255,255,255,.08);
    transform:rotate(45deg);
    border-radius:10px;
    opacity:.55;
    pointer-events:none;
  }

  /* ---------- footer ---------- */
  .site-footer{
    margin-top:64px;
    border-top:1px solid var(--line);
    background:var(--ink-900);
    padding:44px 0 28px;
  }
  @media (min-width:1024px){ .site-footer{margin-top:88px;padding:56px 0 30px} }
  .foot-grid{
    display:grid;
    grid-template-columns:1fr;
    gap:28px;
  }
  @media (min-width:640px){ .foot-grid{grid-template-columns:1fr 1fr} }
  @media (min-width:1024px){ .foot-grid{grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:36px} }
  .foot-desc{margin-top:14px;font-size:13px;line-height:1.8;color:var(--t3);max-width:320px}
  .foot-title{font-size:13px;font-weight:700;letter-spacing:.06em;color:var(--t2);margin-bottom:14px}
  .foot-links{display:grid;gap:10px}
  .foot-link{font-size:13px;color:var(--t2);line-height:1.7;transition:color var(--tr)}
  a.foot-link:hover{color:var(--accent-400)}
  .foot-bottom{
    margin-top:32px;
    padding-top:18px;
    border-top:1px solid var(--line-soft);
    display:flex;
    flex-wrap:wrap;
    gap:10px 24px;
    justify-content:space-between;
    font-size:12px;
    color:var(--t3);
    font-family:var(--mono);
    font-variant-numeric:tabular-nums;
  }

  /* ---------- mobile tab ---------- */
  .mobile-tab{display:none}
  @media (max-width:767px){
    body{padding-bottom:84px}
    .main-nav{display:none}
    .header-inner{height:56px;gap:12px}
    .header-cta{height:36px;padding:0 14px;font-size:13px}
    .mobile-tab{
      display:flex;
      position:fixed;
      left:0;right:0;bottom:0;
      z-index:70;
      height:64px;
      padding-bottom:env(safe-area-inset-bottom);
      background:rgba(10,15,28,.92);
      -webkit-backdrop-filter:blur(14px);
      backdrop-filter:blur(14px);
      border-top:1px solid var(--line);
    }
    .tab-item{
      flex:1 1 0;
      position:relative;
      display:flex;
      flex-direction:column;
      align-items:center;
      justify-content:center;
      gap:4px;
      font-size:10px;
      color:var(--t3);
      transition:color var(--tr);
    }
    .tab-item svg{width:22px;height:22px}
    .tab-item::before{
      content:"";
      position:absolute;
      top:0;left:50%;
      transform:translateX(-50%) scaleX(0);
      width:20px;height:2px;
      border-radius:2px;
      background:var(--brand-400);
      transition:transform var(--tr);
    }
    .tab-item.active{color:var(--brand-400)}
    .tab-item.active::before{transform:translateX(-50%) scaleX(1)}
  }

  @media (prefers-reduced-motion:reduce){
    *,*::before,*::after{transition:none!important;animation:none!important;scroll-behavior:auto!important}
    .btn:hover,.side-link:hover,.related-link:hover{transform:none}
  }

/* roulang page: category2 */
:root{
    --ink-950:#05070E;
    --ink-900:#0A0F1C;
    --ink-800:#101827;
    --ink-700:rgba(22,32,51,.72);
    --brand-500:#1F6BFF;
    --brand-400:#4D8BFF;
    --brand-600:#1550CC;
    --accent-400:#2BE8B0;
    --signal-500:#FF5C4D;
    --t-1:#E9EEF7;
    --t-2:#9AA7BE;
    --t-3:#64718A;
    --line:rgba(255,255,255,.08);
    --line-soft:rgba(255,255,255,.055);
    --r-card:18px;
    --r-lg:24px;
    --r-sm:12px;
    --shadow-card:0 12px 32px -18px rgba(0,0,0,.9);
    --shadow-glow:0 0 0 1px rgba(31,107,255,.55), 0 10px 32px -10px rgba(31,107,255,.7);
    --ease:cubic-bezier(.2,.8,.2,1);
    --mono:ui-monospace,"SF Mono",Menlo,Consolas,monospace;
    --font:-apple-system,BlinkMacSystemFont,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",sans-serif;
  }

  *,*::before,*::after{box-sizing:border-box}
  html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
  body{
    margin:0;
    font-family:var(--font);
    font-size:16px;
    line-height:1.7;
    color:var(--t-1);
    background:var(--ink-950);
    -webkit-font-smoothing:antialiased;
  }
  img{max-width:100%;display:block}
  a{color:inherit;text-decoration:none}
  button{font-family:inherit}
  h1,h2,h3,h4,p,ul,ol,figure{margin:0}
  ul,ol{padding:0;list-style:none}
  ::selection{background:rgba(31,107,255,.4);color:#fff}
  :focus-visible{outline:2px solid var(--brand-400);outline-offset:2px;border-radius:6px}

  .container-x{
    width:100%;
    max-width:1200px;
    margin:0 auto;
    padding-left:20px;
    padding-right:20px;
  }
  @media (min-width:768px){.container-x{padding-left:28px;padding-right:28px}}
  @media (min-width:1024px){.container-x{padding-left:40px;padding-right:40px}}

  .section{padding-top:56px;padding-bottom:56px}
  @media (min-width:1024px){.section{padding-top:88px;padding-bottom:88px}}

  .mono{font-family:var(--mono);font-variant-numeric:tabular-nums;font-feature-settings:"tnum"}

  /* ---------- 头部导航 ---------- */
  .site-header{
    position:sticky;top:0;z-index:60;
    background:rgba(5,7,14,.55);
    backdrop-filter:blur(14px);
    -webkit-backdrop-filter:blur(14px);
    border-bottom:1px solid transparent;
    transition:background 180ms var(--ease),border-color 180ms var(--ease);
  }
  .site-header.scrolled{
    background:rgba(5,7,14,.72);
    border-bottom-color:var(--line);
  }
  .header-inner{
    display:flex;align-items:center;justify-content:space-between;
    gap:18px;min-height:64px;
  }
  .logo{display:inline-flex;align-items:center;gap:10px;color:var(--t-1)}
  .logo-mark{width:28px;height:28px;color:var(--brand-400);flex:none}
  @media (min-width:768px){.logo-mark{width:32px;height:32px}}
  .logo-text{display:inline-flex;align-items:baseline;gap:6px;line-height:1}
  .logo-cn{font-size:19px;font-weight:700;letter-spacing:.02em}
  @media (min-width:768px){.logo-cn{font-size:21px}}
  .logo-en{font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--t-3)}

  .main-nav{display:none;align-items:center;gap:28px}
  @media (min-width:1024px){.main-nav{display:flex}}
  .nav-link{
    position:relative;font-size:14px;color:var(--t-2);
    padding:6px 0;transition:color 180ms var(--ease);
  }
  .nav-link::after{
    content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;
    background:var(--brand-500);border-radius:2px;opacity:0;transform:scaleX(.4);
    transition:opacity 180ms var(--ease),transform 180ms var(--ease);
  }
  .nav-link:hover{color:var(--t-1)}
  .nav-link:hover::after{opacity:.5;transform:scaleX(1)}
  .nav-link.active{color:var(--brand-400)}
  .nav-link.active::after{opacity:1;transform:scaleX(1)}

  .btn{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    height:44px;padding:0 22px;
    border-radius:999px;border:1px solid transparent;
    font-size:14px;font-weight:600;letter-spacing:.02em;
    cursor:pointer;transition:transform 180ms var(--ease),box-shadow 180ms var(--ease),
      background 180ms var(--ease),color 180ms var(--ease),border-color 180ms var(--ease);
    white-space:nowrap;
  }
  .btn-primary{background:var(--brand-500);color:#fff;box-shadow:var(--shadow-glow)}
  .btn-primary:hover{background:#2a74ff;box-shadow:0 0 0 1px rgba(31,107,255,.65),0 14px 36px -10px rgba(31,107,255,.8);transform:translateY(-1px)}
  .btn-primary:active{transform:translateY(0);box-shadow:0 0 0 1px rgba(31,107,255,.5),0 6px 18px -10px rgba(31,107,255,.7)}
  .btn-ghost{background:transparent;color:var(--t-1);border-color:rgba(255,255,255,.18)}
  .btn-ghost:hover{border-color:rgba(77,139,255,.65);color:#fff;background:rgba(31,107,255,.1)}
  .btn-sm{height:36px;padding:0 16px;font-size:13px}
  .header-cta{display:none}
  @media (min-width:768px){.header-cta{display:inline-flex}}

  /* ---------- Hero ---------- */
  .hero{
    position:relative;overflow:hidden;
    border-bottom:1px solid var(--line-soft);
    background:
      radial-gradient(60% 80% at 78% 8%,rgba(31,107,255,.18),transparent 70%),
      var(--ink-900);
  }
  .hero-media{
    position:absolute;inset:0;
    background-image:url('/assets/images/backpic/back-1.png');
    background-size:cover;background-position:center;
    opacity:.22;
  }
  .hero-media::after{
    content:"";position:absolute;inset:0;
    background:linear-gradient(180deg,rgba(5,7,14,.45) 0%,rgba(5,7,14,.9) 62%,var(--ink-950) 100%);
  }
  .hero-grid-bg{
    position:absolute;inset:auto 0 0 0;height:220px;pointer-events:none;
    background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),
      linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
    background-size:24px 24px;
    mask-image:linear-gradient(180deg,transparent,#000 70%);
    -webkit-mask-image:linear-gradient(180deg,transparent,#000 70%);
    opacity:.75;
  }
  .hero-inner{position:relative;z-index:2;padding-top:48px;padding-bottom:52px}
  @media (min-width:1024px){.hero-inner{padding-top:76px;padding-bottom:80px}}

  .badge{
    display:inline-flex;align-items:center;gap:8px;
    padding:6px 13px;border-radius:999px;
    font-size:12px;letter-spacing:.06em;color:#cfe0ff;
    border:1px solid rgba(31,107,255,.3);
    background:rgba(31,107,255,.1);
  }
  .dot-live{width:6px;height:6px;border-radius:50%;background:var(--signal-500);flex:none}

  .hero h1{
    margin-top:20px;
    font-size:clamp(28px,4.2vw,52px);
    line-height:1.18;font-weight:700;letter-spacing:-.02em;
    max-width:20ch;
  }
  .hero-sub{
    margin-top:18px;max-width:52ch;
    font-size:16px;color:var(--t-2);line-height:1.8;
  }
  @media (min-width:1024px){.hero-sub{font-size:18px}}
  .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}

  .stat-row{
    display:grid;grid-template-columns:repeat(3,1fr);gap:12px;
    margin-top:36px;max-width:520px;
  }
  .stat{
    background:var(--ink-800);
    border:1px solid var(--line);
    border-radius:14px;
    padding:12px 14px;
    box-shadow:var(--shadow-card);
  }
  .stat-num{font-family:var(--mono);font-variant-numeric:tabular-nums;font-size:20px;font-weight:600;color:var(--accent-400)}
  .stat-label{font-size:11px;color:var(--t-3);margin-top:2px;letter-spacing:.04em}

  /* ---------- 通用板块头 ---------- */
  .section-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:14px;margin-bottom:28px}
  .eyebrow{
    display:inline-block;font-size:12px;letter-spacing:.16em;text-transform:uppercase;
    color:var(--accent-400);margin-bottom:10px;
  }
  .h2{font-size:clamp(22px,3vw,30px);font-weight:700;letter-spacing:-.01em;line-height:1.3}
  .section-note{margin-top:10px;font-size:14px;color:var(--t-2);max-width:46ch}
  .link-more{font-size:14px;color:var(--brand-400);display:inline-flex;align-items:center;gap:6px;transition:color 180ms var(--ease)}
  .link-more:hover{color:var(--accent-400)}

  /* ---------- 编号清单 ---------- */
  .num-list{
    background:var(--ink-800);
    border:1px solid var(--line);
    border-radius:var(--r-card);
    overflow:hidden;
    box-shadow:var(--shadow-card);
  }
  .num-item{
    display:grid;
    grid-template-columns:44px 1fr;
    gap:14px;
    align-items:start;
    padding:18px 18px;
    border-bottom:1px solid var(--line-soft);
    transition:background 180ms var(--ease);
  }
  @media (min-width:768px){
    .num-item{grid-template-columns:64px 1fr auto;gap:20px;align-items:center;padding:20px 24px}
  }
  .num-item:last-child{border-bottom:0}
  .num-item:hover{background:rgba(31,107,255,.06)}
  .num-index{
    font-family:var(--mono);font-variant-numeric:tabular-nums;
    font-size:24px;font-weight:600;line-height:1;
    color:transparent;-webkit-text-stroke:1px rgba(77,139,255,.75);
  }
  @media (min-width:768px){.num-index{font-size:32px}}
  .num-title{font-size:16px;font-weight:600;line-height:1.5}
  .num-desc{font-size:13.5px;color:var(--t-2);margin-top:4px;line-height:1.7}
  .num-tag{
    display:none;
    font-size:12px;color:var(--accent-400);
    border:1px solid rgba(43,232,176,.3);
    background:rgba(43,232,176,.08);
    padding:4px 10px;border-radius:999px;white-space:nowrap;
  }
  @media (min-width:768px){.num-tag{display:inline-flex}}

  /* ---------- 双列交错卡 ---------- */
  .stagger{
    display:grid;gap:16px;grid-template-columns:1fr;
  }
  @media (min-width:768px){
    .stagger{grid-template-columns:1fr 1fr;gap:20px}
    .stagger > .stagger-col-2{transform:translateY(36px)}
    .stagger-wrap{padding-bottom:36px}
  }
  .play-card{
    background:var(--ink-800);
    border:1px solid var(--line);
    border-radius:var(--r-card);
    overflow:hidden;
    box-shadow:var(--shadow-card);
    transition:transform 180ms var(--ease),border-color 180ms var(--ease),box-shadow 180ms var(--ease);
  }
  .play-card:hover{transform:translateY(-2px);border-color:rgba(77,139,255,.4);box-shadow:0 18px 40px -22px rgba(0,0,0,.95)}
  .card-media{position:relative;aspect-ratio:16/10;overflow:hidden;background:var(--ink-900)}
  .card-media img{width:100%;height:100%;object-fit:cover;transition:transform 400ms var(--ease)}
  .play-card:hover .card-media img{transform:scale(1.04)}
  .card-media::after{
    content:"";position:absolute;inset:0;
    background:linear-gradient(180deg,rgba(5,7,14,.05) 30%,rgba(16,24,39,.92) 100%);
  }
  .card-body{padding:18px 20px 22px}
  .tag{
    display:inline-flex;align-items:center;
    font-size:11.5px;letter-spacing:.06em;
    padding:3px 10px;border-radius:999px;
    color:#bcd3ff;background:rgba(31,107,255,.14);
    border:1px solid rgba(31,107,255,.26);
  }
  .card-body h3{margin-top:12px;font-size:17px;font-weight:600;line-height:1.45}
  .card-body p{margin-top:8px;font-size:13.5px;color:var(--t-2);line-height:1.75}
  .card-foot{margin-top:14px;display:flex;align-items:center;justify-content:space-between;font-size:12px;color:var(--t-3)}
  .card-foot .mono{color:var(--t-3)}
  .arrow-ic{width:16px;height:16px;color:var(--brand-400);transition:transform 180ms var(--ease)}
  .play-card:hover .arrow-ic{transform:translateX(3px)}

  /* ---------- 折叠要点 ---------- */
  .acc{
    background:var(--ink-800);
    border:1px solid var(--line);
    border-radius:var(--r-card);
    box-shadow:var(--shadow-card);
    overflow:hidden;
  }
  .acc-item{border-bottom:1px solid var(--line-soft)}
  .acc-item:last-child{border-bottom:0}
  .acc-trigger{
    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(--t-1);font-size:15px;font-weight:600;line-height:1.6;
    transition:color 180ms var(--ease),background 180ms var(--ease);
  }
  .acc-trigger:hover{color:var(--brand-400);background:rgba(31,107,255,.05)}
  .acc-ico{
    flex:none;width:22px;height:22px;border-radius:50%;
    border:1px solid rgba(255,255,255,.18);
    display:inline-flex;align-items:center;justify-content:center;
    color:var(--brand-400);font-size:14px;line-height:1;
    transition:transform 220ms var(--ease),border-color 180ms var(--ease);
  }
  .acc-item.open .acc-ico{transform:rotate(180deg);border-color:rgba(77,139,255,.6)}
  .acc-panel{
    display:grid;grid-template-rows:0fr;
    transition:grid-template-rows 260ms var(--ease);
  }
  .acc-item.open .acc-panel{grid-template-rows:1fr}
  .acc-panel > div{overflow:hidden}
  .acc-panel p{
    padding:0 20px 20px;font-size:14px;line-height:1.85;color:var(--t-2);max-width:720px;
  }

  /* ---------- 三步流程 ---------- */
  .flow{display:grid;gap:14px;grid-template-columns:1fr}
  @media (min-width:768px){.flow{grid-template-columns:repeat(3,1fr);gap:18px}}
  .flow-step{
    position:relative;
    background:var(--ink-800);
    border:1px solid var(--line);
    border-radius:var(--r-card);
    padding:20px 20px 22px;
    box-shadow:var(--shadow-card);
    transition:border-color 180ms var(--ease),transform 180ms var(--ease);
  }
  .flow-step:hover{border-color:rgba(77,139,255,.4);transform:translateY(-2px)}
  .flow-idx{font-family:var(--mono);font-variant-numeric:tabular-nums;font-size:12px;color:var(--accent-400);letter-spacing:.14em}
  .flow-step h3{margin-top:10px;font-size:16px;font-weight:600}
  .flow-step p{margin-top:8px;font-size:13.5px;color:var(--t-2);line-height:1.75}

  /* ---------- FAQ ---------- */
  .faq-wrap{
    background:var(--ink-800);
    border:1px solid var(--line);
    border-radius:var(--r-card);
    overflow:hidden;
    box-shadow:var(--shadow-card);
  }
  .faq-item + .faq-item{border-top:1px solid var(--line-soft)}
  .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(--t-1);font-size:15px;font-weight:600;line-height:1.6;
    transition:background 180ms var(--ease),color 180ms var(--ease);
  }
  .faq-q:hover{background:rgba(31,107,255,.05);color:var(--brand-400)}
  .faq-a{display:grid;grid-template-rows:0fr;transition:grid-template-rows 260ms var(--ease)}
  .faq-item.open .faq-a{grid-template-rows:1fr}
  .faq-a > div{overflow:hidden}
  .faq-a p{padding:0 20px 20px;font-size:14px;line-height:1.85;color:var(--t-2);max-width:720px}

  /* ---------- CTA 面板 ---------- */
  .cta-panel{
    position:relative;overflow:hidden;
    border-radius:var(--r-lg);
    border:1px solid var(--line);
    background:rgba(255,255,255,.045);
    backdrop-filter:blur(14px);
    -webkit-backdrop-filter:blur(14px);
    box-shadow:var(--shadow-card);
    padding:26px 20px;
  }
  @media (min-width:1024px){.cta-panel{padding:40px}}
  .cta-panel::before{
    content:"";position:absolute;inset:0 0 auto 0;height:1px;
    background:linear-gradient(90deg,transparent,rgba(255,255,255,.35),transparent);
  }
  .cta-bg{
    position:absolute;inset:0;pointer-events:none;
    background-image:url('/assets/images/backpic/back-2.png');
    background-size:cover;background-position:center;
    opacity:.1;
  }
  .cta-grid-bg{
    position:absolute;inset:auto 0 0 0;height:180px;pointer-events:none;
    background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),
      linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
    background-size:24px 24px;
    mask-image:linear-gradient(180deg,transparent,#000 75%);
    -webkit-mask-image:linear-gradient(180deg,transparent,#000 75%);
  }
  .cta-inner{position:relative;z-index:2;display:grid;gap:26px}
  @media (min-width:1024px){.cta-inner{grid-template-columns:1.35fr .65fr;align-items:center;gap:40px}}
  .cta-steps{display:grid;gap:14px;margin-top:24px}
  @media (min-width:768px){.cta-steps{grid-template-columns:repeat(3,1fr);position:relative}}
  @media (min-width:768px){
    .cta-steps::before{
      content:"";position:absolute;left:6%;right:6%;top:11px;height:1px;
      background:linear-gradient(90deg,rgba(77,139,255,.5),rgba(43,232,176,.25));
    }
  }
  .cta-step{position:relative}
  .cta-step .mono{display:inline-block;font-size:12px;color:var(--accent-400);background:var(--ink-900);padding-right:8px}
  .cta-step h4{margin-top:8px;font-size:15px;font-weight:600}
  .cta-step p{margin-top:6px;font-size:12.5px;color:var(--t-3);line-height:1.7}
  .cta-actions{display:flex;flex-direction:column;gap:12px}
  .cta-actions .btn{width:100%}
  .cta-hint{font-size:12px;color:var(--t-3);text-align:center;line-height:1.7}
  .cta-diamond{
    position:absolute;right:22px;bottom:18px;width:64px;height:64px;
    border:1px solid rgba(255,255,255,.09);transform:rotate(45deg);border-radius:12px;
    pointer-events:none;
  }

  /* ---------- 页脚 ---------- */
  .site-footer{
    border-top:1px solid var(--line);
    background:var(--ink-900);
    padding:48px 0 28px;
    margin-top:0;
  }
  .foot-grid{display:grid;gap:28px;grid-template-columns:1fr}
  @media (min-width:768px){.foot-grid{grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:24px}}
  .foot-desc{margin-top:14px;font-size:13px;color:var(--t-3);line-height:1.8;max-width:34ch}
  .foot-title{font-size:13px;font-weight:600;color:var(--t-1);letter-spacing:.04em;margin-bottom:12px}
  .foot-links{display:flex;flex-direction:column;gap:9px}
  .foot-link{font-size:13px;color:var(--t-2);transition:color 180ms var(--ease)}
  a.foot-link:hover{color:var(--accent-400)}
  .foot-bottom{
    margin-top:34px;padding-top:18px;border-top:1px solid var(--line-soft);
    display:flex;flex-wrap:wrap;gap:8px 18px;justify-content:space-between;
    font-size:12px;color:var(--t-3);
  }

  /* ---------- 移动底部 Tab ---------- */
  .mobile-tab{
    position:fixed;left:0;right:0;bottom:0;z-index:70;
    display:grid;grid-template-columns:repeat(5,1fr);
    height:64px;padding-bottom:env(safe-area-inset-bottom);
    background:rgba(10,15,28,.92);
    backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
    border-top:1px solid var(--line);
  }
  @media (min-width:768px){.mobile-tab{display:none}}
  .tab-item{
    position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;
    font-size:10px;color:var(--t-3);transition:color 180ms var(--ease);
  }
  .tab-item svg{width:24px;height:24px}
  .tab-item.active{color:var(--brand-400)}
  .tab-item.active::before{
    content:"";position:absolute;top:0;left:50%;transform:translateX(-50%);
    width:22px;height:2px;border-radius:2px;background:var(--brand-400);
  }
  @media (max-width:767px){
    body{padding-bottom:84px}
  }

  @media (prefers-reduced-motion:reduce){
    *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
    .play-card:hover,.flow-step:hover,.btn:hover{transform:none!important}
    .play-card:hover .card-media img{transform:none!important}
  }

/* roulang page: category3 */
:root{
  --ink-950:#05070E;
  --ink-900:#0A0F1C;
  --ink-800:#101827;
  --line:rgba(255,255,255,.08);
  --line-strong:rgba(255,255,255,.14);
  --brand-500:#1F6BFF;
  --brand-400:#4D8BFF;
  --brand-600:#1550CC;
  --accent-400:#2BE8B0;
  --signal-500:#FF5C4D;
  --t1:#E9EEF7;
  --t2:#9AA7BE;
  --t3:#64718A;
  --r-sm:12px;
  --r-card:18px;
  --r-lg:24px;
  --r-pill:999px;
  --shadow-card:0 12px 32px -18px rgba(0,0,0,.9);
  --shadow-glow:0 0 0 1px rgba(31,107,255,.55), 0 10px 32px -10px rgba(31,107,255,.7);
  --ease:cubic-bezier(.2,.8,.2,1);
  --dur:180ms;
  --space-block:56px;
}
@media (min-width:1024px){
  :root{ --space-block:88px; }
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--ink-950);
  color:var(--t1);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",sans-serif;
  font-size:15px;
  line-height:1.7;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
@media (max-width:767px){
  body{padding-bottom:84px;}
}
img{display:block;max-width:100%;height:auto;border-style:none;}
a{color:inherit;text-decoration:none;transition:color var(--dur) var(--ease);}
a:hover{color:var(--accent-400);}
button{font-family:inherit;font-size:inherit;color:inherit;background:none;border:none;cursor:pointer;}
ul,ol{margin:0;padding:0;list-style:none;}
p{margin:0;}
h1,h2,h3,h4{margin:0;font-weight:700;letter-spacing:-.01em;line-height:1.3;}
:focus-visible{outline:2px solid var(--brand-400);outline-offset:2px;border-radius:6px;}
.mono{font-family:ui-monospace,"SF Mono",Menlo,Consolas,monospace;font-variant-numeric:tabular-nums;letter-spacing:.01em;}

.container-x{
  width:100%;
  max-width:1200px;
  margin:0 auto;
  padding-left:20px;
  padding-right:20px;
}
@media (min-width:768px){
  .container-x{padding-left:28px;padding-right:28px;}
}
@media (min-width:1024px){
  .container-x{padding-left:40px;padding-right:40px;}
}

/* ---------- header ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(5,7,14,.55);
  border-bottom:1px solid transparent;
  transition:background var(--dur) var(--ease), border-color var(--dur) var(--ease), backdrop-filter var(--dur) var(--ease);
}
.site-header.is-stuck{
  background:rgba(5,7,14,.72);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom-color:var(--line);
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  min-height:68px;
}
.logo{
  display:inline-flex;
  align-items:center;
  gap:9px;
  color:var(--t1);
  flex:0 0 auto;
}
.logo:hover{color:var(--t1);}
.logo-mark{
  width:30px;height:30px;
  color:var(--brand-400);
  flex:0 0 auto;
}
.logo-text{display:inline-flex;align-items:baseline;gap:6px;}
.logo-cn{font-size:17px;font-weight:700;letter-spacing:.02em;}
.logo-en{
  font-family:ui-monospace,"SF Mono",Menlo,monospace;
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--t3);
}
.main-nav{display:none;align-items:center;gap:28px;}
.nav-link{
  position:relative;
  font-size:14px;
  color:var(--t2);
  padding:22px 0;
  white-space:nowrap;
  transition:color var(--dur) var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:14px;
  height:2px;
  background:var(--brand-500);
  border-radius:2px;
  opacity:0;
  transform:scaleX(.4);
  transition:opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.nav-link:hover{color:var(--t1);}
.nav-link.active{color:var(--brand-400);}
.nav-link.active::after{opacity:1;transform:scaleX(1);}
.header-cta{display:none;}
@media (min-width:1024px){
  .main-nav{display:flex;}
  .header-cta{display:inline-flex;}
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:44px;
  padding:0 22px;
  border-radius:var(--r-pill);
  font-size:14px;
  font-weight:600;
  letter-spacing:.01em;
  white-space:nowrap;
  transition:transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.btn-sm{height:36px;padding:0 16px;font-size:13px;}
.btn-primary{
  background:linear-gradient(180deg,var(--brand-400),var(--brand-500));
  color:#fff;
  box-shadow:var(--shadow-glow);
}
.btn-primary:hover{
  color:#fff;
  transform:translateY(-1px);
  box-shadow:0 0 0 1px rgba(31,107,255,.55), 0 10px 32px -6px rgba(31,107,255,.85);
  filter:brightness(1.06);
}
.btn-primary:active{transform:translateY(0);}
.btn-ghost{
  background:rgba(255,255,255,.04);
  border:1px solid var(--line-strong);
  color:var(--t1);
  border-radius:var(--r-pill);
}
.btn-ghost:hover{
  color:var(--t1);
  border-color:rgba(77,139,255,.5);
  background:rgba(31,107,255,.08);
  transform:translateY(-1px);
}
.btn-square{border-radius:var(--r-sm);}
.btn-block{width:100%;}

/* ---------- breadcrumb ---------- */
.crumb-bar{padding-top:22px;}
.breadcrumb{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:8px;
  font-size:12px;
  color:var(--t3);
}
.breadcrumb li{display:inline-flex;align-items:center;gap:8px;}
.breadcrumb li+li::before{
  content:"";
  width:0;height:0;
  border-left:4px solid var(--brand-500);
  border-top:3px solid transparent;
  border-bottom:3px solid transparent;
  opacity:.75;
}
.breadcrumb a{color:var(--t3);}
.breadcrumb a:hover{color:var(--accent-400);}
.breadcrumb .current{color:var(--t2);}

/* ---------- hero ---------- */
.hero-cat{
  position:relative;
  padding:var(--space-block) 0 calc(var(--space-block) * .7);
  overflow:hidden;
}
.hero-cat::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:520px;
  background:
    radial-gradient(760px 320px at 18% 0%, rgba(31,107,255,.18), transparent 70%),
    linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px) 0 0/24px 24px,
    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px) 0 0/24px 24px;
  -webkit-mask-image:linear-gradient(180deg,#000 0%,transparent 92%);
  mask-image:linear-gradient(180deg,#000 0%,transparent 92%);
  pointer-events:none;
}
.hero-cat .container-x{position:relative;z-index:1;}
.hero-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:32px;
  align-items:center;
}
@media (min-width:1024px){
  .hero-grid{grid-template-columns:55fr 45fr;gap:48px;}
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:6px 14px;
  border-radius:var(--r-pill);
  border:1px solid rgba(31,107,255,.3);
  background:rgba(31,107,255,.08);
  font-size:12px;
  color:var(--brand-400);
  letter-spacing:.02em;
}
.eyebrow .dot{
  width:6px;height:6px;border-radius:50%;
  background:var(--signal-500);
  box-shadow:0 0 8px rgba(255,92,77,.8);
}
.hero-title{
  margin-top:18px;
  font-size:clamp(28px,4.2vw,52px);
  font-weight:700;
  letter-spacing:-.02em;
  line-height:1.18;
}
.hero-title .kw{white-space:nowrap;color:#fff;}
.hero-title .accent{
  background:linear-gradient(92deg,var(--brand-400),var(--accent-400));
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.hero-lead{
  margin-top:16px;
  font-size:16px;
  line-height:1.75;
  color:var(--t2);
  max-width:560px;
}
@media (min-width:768px){
  .hero-lead{font-size:18px;}
}
.hero-actions{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin-top:26px;
}
.stat-row{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:12px;
  margin-top:30px;
  max-width:520px;
}
.stat{
  padding:14px 12px;
  border-radius:var(--r-sm);
  background:var(--ink-800);
  border:1px solid var(--line);
  box-shadow:var(--shadow-card);
}
.stat-num{
  font-family:ui-monospace,"SF Mono",Menlo,monospace;
  font-variant-numeric:tabular-nums;
  font-size:20px;
  font-weight:700;
  color:var(--accent-400);
  line-height:1.2;
}
.stat-label{
  margin-top:2px;
  font-size:11px;
  color:var(--t3);
  letter-spacing:.02em;
}
.hero-figure{
  position:relative;
  border-radius:var(--r-lg);
  overflow:hidden;
  border:1px solid var(--line);
  background:var(--ink-800);
  box-shadow:var(--shadow-card);
  aspect-ratio:4/3;
}
.hero-figure img{
  width:100%;height:100%;
  object-fit:cover;
  opacity:.9;
}
.hero-figure::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(5,7,14,.15) 0%,rgba(5,7,14,.72) 62%,rgba(5,7,14,.94) 100%);
}
.hero-figure-cap{
  position:absolute;
  left:20px;right:20px;bottom:18px;
  z-index:2;
}
.hero-figure-cap .tag{
  display:inline-flex;
  align-items:center;
  padding:3px 10px;
  border-radius:var(--r-pill);
  border:1px solid rgba(43,232,176,.35);
  background:rgba(43,232,176,.1);
  font-size:11px;
  color:var(--accent-400);
  letter-spacing:.04em;
}
.hero-figure-cap p{
  margin-top:10px;
  font-size:14px;
  line-height:1.6;
  color:var(--t1);
}

/* ---------- section base ---------- */
.section{padding:var(--space-block) 0;}
.section-alt{background:var(--ink-900);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.section-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:16px;
  flex-wrap:wrap;
  margin-bottom:26px;
}
.section-title{
  font-size:clamp(22px,2.6vw,30px);
  font-weight:700;
  letter-spacing:-.015em;
}
.section-sub{
  margin-top:8px;
  font-size:14px;
  color:var(--t2);
  max-width:640px;
}
.section-link{
  font-size:13px;
  color:var(--brand-400);
  display:inline-flex;
  align-items:center;
  gap:6px;
  white-space:nowrap;
}
.section-link:hover{color:var(--accent-400);}

/* ---------- faq split layout ---------- */
.faq-split{
  display:grid;
  grid-template-columns:1fr;
  gap:28px;
  align-items:start;
}
@media (min-width:1024px){
  .faq-split{grid-template-columns:300px 1fr;gap:56px;}
}
.faq-side{position:relative;}
@media (min-width:1024px){
  .faq-side{position:sticky;top:96px;}
}
.faq-side h2{
  font-size:clamp(22px,2.4vw,28px);
  line-height:1.32;
}
.faq-side p{
  margin-top:12px;
  font-size:14px;
  color:var(--t2);
  line-height:1.8;
}
.side-index{
  margin-top:22px;
  display:flex;
  flex-direction:column;
  gap:2px;
  border-top:1px solid var(--line);
  padding-top:14px;
}
.side-index a{
  display:flex;
  align-items:center;
  gap:10px;
  padding:9px 10px;
  border-radius:10px;
  font-size:13px;
  color:var(--t2);
  transition:background var(--dur) var(--ease), color var(--dur) var(--ease);
}
.side-index a .idx{
  font-family:ui-monospace,"SF Mono",Menlo,monospace;
  font-size:11px;
  color:var(--t3);
  min-width:20px;
}
.side-index a:hover{
  background:rgba(31,107,255,.08);
  color:var(--accent-400);
}
.faq-groups{display:flex;flex-direction:column;gap:34px;}
.faq-group-head{
  display:flex;
  align-items:center;
  gap:12px;
  margin-bottom:12px;
}
.faq-group-head .gnum{
  font-family:ui-monospace,"SF Mono",Menlo,monospace;
  font-size:12px;
  color:var(--accent-400);
  border:1px solid rgba(43,232,176,.32);
  border-radius:8px;
  padding:2px 8px;
  letter-spacing:.06em;
}
.faq-group-head h3{
  font-size:16px;
  font-weight:700;
  letter-spacing:0;
}
.faq-group-head .gcount{
  margin-left:auto;
  font-size:11px;
  color:var(--t3);
  font-family:ui-monospace,"SF Mono",Menlo,monospace;
}
.faq-list{
  background:var(--ink-800);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  box-shadow:var(--shadow-card);
  overflow:hidden;
}
.faq-item + .faq-item{border-top:1px solid var(--line);}
.faq-q{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  width:100%;
  text-align:left;
  padding:16px 18px;
  font-size:15px;
  font-weight:500;
  color:var(--t1);
  transition:background var(--dur) var(--ease), color var(--dur) var(--ease);
}
.faq-q:hover{background:rgba(31,107,255,.06);color:var(--accent-400);}
.faq-icon{
  flex:0 0 auto;
  width:22px;height:22px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border-radius:50%;
  border:1px solid var(--line-strong);
  color:var(--t2);
  font-size:14px;
  line-height:1;
  transition:transform var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.faq-item.is-open .faq-icon{
  transform:rotate(180deg);
  border-color:rgba(77,139,255,.5);
  color:var(--brand-400);
}
.faq-a{
  display:none;
  padding:0 18px 18px;
  font-size:14px;
  line-height:1.85;
  color:var(--t2);
  max-width:720px;
}
.faq-item.is-open .faq-a{display:block;}

/* ---------- quick check cards ---------- */
.check-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:16px;
}
@media (min-width:640px){
  .check-grid{grid-template-columns:repeat(2,1fr);}
}
@media (min-width:1024px){
  .check-grid{grid-template-columns:repeat(3,1fr);}
}
.check-card{
  position:relative;
  padding:22px 20px 20px;
  background:var(--ink-800);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  box-shadow:var(--shadow-card);
  transition:transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.check-card:hover{transform:translateY(-2px);border-color:rgba(77,139,255,.4);}
.check-card .cc-num{
  font-family:ui-monospace,"SF Mono",Menlo,monospace;
  font-size:12px;
  letter-spacing:.1em;
  color:var(--brand-400);
  border:1px solid rgba(31,107,255,.32);
  border-radius:8px;
  padding:2px 8px;
  display:inline-block;
}
.check-card h3{
  margin-top:14px;
  font-size:17px;
  line-height:1.45;
}
.check-card p{
  margin-top:8px;
  font-size:13.5px;
  color:var(--t2);
  line-height:1.75;
}
.check-card .cc-tail{
  margin-top:14px;
  padding-top:12px;
  border-top:1px dashed var(--line);
  font-size:12px;
  color:var(--t3);
}

/* ---------- form ---------- */
.help-panel{
  background:var(--ink-800);
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  padding:26px 20px;
  box-shadow:var(--shadow-card);
}
@media (min-width:768px){
  .help-panel{padding:36px;}
}
.help-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:28px;
}
@media (min-width:1024px){
  .help-grid{grid-template-columns:1fr 1fr;gap:48px;align-items:start;}
}
.field{margin-bottom:16px;}
.field label{
  display:block;
  font-size:13px;
  color:var(--t2);
  margin-bottom:7px;
  letter-spacing:.01em;
}
.field input,
.field textarea,
.field select{
  width:100%;
  min-height:44px;
  padding:11px 14px;
  background:#0A101C;
  border:1px solid var(--line-strong);
  border-radius:var(--r-sm);
  color:var(--t1);
  font-size:14px;
  font-family:inherit;
  line-height:1.6;
  transition:border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease), background var(--dur) var(--ease);
}
.field textarea{min-height:110px;resize:vertical;}
.field input::placeholder,
.field textarea::placeholder{color:var(--t3);}
.field input:focus,
.field textarea:focus,
.field select:focus{
  outline:none;
  border-color:rgba(31,107,255,.6);
  box-shadow:0 0 0 2px rgba(31,107,255,.22);
  background:#0C1322;
}
.field .hint{
  margin-top:6px;
  font-size:12px;
  color:var(--t3);
}
.field .err{
  margin-top:6px;
  font-size:12px;
  color:var(--signal-500);
  display:none;
}
.field.has-error input,
.field.has-error textarea{border-color:var(--signal-500);}
.field.has-error .err{display:block;}
.form-note{
  font-size:12px;
  color:var(--t3);
  line-height:1.7;
  margin-top:12px;
}
.help-list{
  display:flex;
  flex-direction:column;
  gap:14px;
  margin-top:18px;
}
.help-item{
  display:flex;
  gap:12px;
  padding:14px 16px;
  border-radius:var(--r-sm);
  background:rgba(255,255,255,.03);
  border:1px solid var(--line);
}
.help-item .hi-dot{
  flex:0 0 auto;
  width:8px;height:8px;
  margin-top:8px;
  border-radius:2px;
  transform:rotate(45deg);
  background:var(--brand-400);
}
.help-item p{font-size:13.5px;color:var(--t2);line-height:1.72;}
.help-item strong{color:var(--t1);font-weight:600;}

/* ---------- CTA panel ---------- */
.cta-panel{
  position:relative;
  border-radius:var(--r-lg);
  padding:30px 20px;
  overflow:hidden;
  background:rgba(255,255,255,.045);
  border:1px solid rgba(255,255,255,.08);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  box-shadow:0 24px 60px -34px rgba(0,0,0,.95);
}
.cta-panel::before{
  content:"";
  position:absolute;
  inset:0;
  background:
    linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px) 0 0/24px 24px,
    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px) 0 0/24px 24px,
    radial-gradient(620px 260px at 78% 118%, rgba(31,107,255,.2), transparent 72%);
  pointer-events:none;
}
.cta-panel::after{
  content:"";
  position:absolute;
  top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.35),transparent);
  pointer-events:none;
}
.cta-inner{
  position:relative;
  z-index:1;
  display:grid;
  grid-template-columns:1fr;
  gap:28px;
  align-items:center;
}
@media (min-width:1024px){
  .cta-inner{grid-template-columns:60fr 40fr;gap:48px;}
  .cta-panel{padding:44px 44px;}
}
.cta-inner h2{
  font-size:clamp(22px,2.6vw,30px);
  letter-spacing:-.015em;
}
.cta-inner .cta-lead{
  margin-top:10px;
  font-size:14px;
  color:var(--t2);
  line-height:1.8;
  max-width:520px;
}
.steps{
  display:grid;
  grid-template-columns:1fr;
  gap:16px;
  margin-top:26px;
}
@media (min-width:640px){
  .steps{grid-template-columns:repeat(3,1fr);gap:0;}
}
.step{position:relative;padding-right:8px;}
@media (min-width:640px){
  .step{padding-right:18px;}
  .step + .step{padding-left:18px;}
  .step + .step::before{
    content:"";
    position:absolute;
    left:0;top:11px;bottom:auto;
    width:1px;height:calc(100% - 22px);
    background:var(--line-strong);
  }
}
.step .s-num{
  font-family:ui-monospace,"SF Mono",Menlo,monospace;
  font-size:12px;
  color:var(--accent-400);
  letter-spacing:.12em;
}
.step .s-title{margin-top:6px;font-size:14.5px;font-weight:600;color:var(--t1);}
.step .s-desc{margin-top:4px;font-size:12px;color:var(--t3);line-height:1.65;}
.cta-buttons{
  display:flex;
  flex-direction:column;
  gap:12px;
}
.cta-tip{
  font-size:12px;
  color:var(--t3);
  line-height:1.6;
}
.cta-deco{
  position:absolute;
  right:22px;bottom:18px;
  width:64px;height:64px;
  border:1px solid rgba(255,255,255,.08);
  transform:rotate(45deg);
  border-radius:10px;
  opacity:.5;
  pointer-events:none;
}

/* ---------- footer ---------- */
.site-footer{
  border-top:1px solid var(--line);
  background:var(--ink-950);
  padding-top:48px;
  margin-top:var(--space-block);
}
.foot-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:30px;
  padding-bottom:36px;
}
@media (min-width:640px){
  .foot-grid{grid-template-columns:repeat(2,1fr);}
}
@media (min-width:1024px){
  .foot-grid{grid-template-columns:1.4fr 1fr 1fr 1.1fr;gap:36px;}
}
.foot-desc{
  margin-top:14px;
  font-size:13px;
  color:var(--t3);
  line-height:1.8;
  max-width:320px;
}
.foot-title{
  font-size:13px;
  color:var(--brand-400);
  opacity:.85;
  letter-spacing:.04em;
  margin-bottom:14px;
}
.foot-links{display:flex;flex-direction:column;gap:9px;}
.foot-link{
  font-size:13px;
  color:var(--t2);
  line-height:1.6;
  transition:color var(--dur) var(--ease);
}
a.foot-link:hover{color:var(--accent-400);}
.foot-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  padding:18px 0 26px;
  border-top:1px solid var(--line);
  font-size:12px;
  color:var(--t3);
  font-family:ui-monospace,"SF Mono",Menlo,monospace;
  letter-spacing:.02em;
}

/* ---------- mobile tab bar ---------- */
.tabbar{
  position:fixed;
  left:0;right:0;bottom:0;
  z-index:90;
  display:grid;
  grid-template-columns:repeat(5,1fr);
  height:64px;
  padding-bottom:env(safe-area-inset-bottom);
  background:rgba(10,15,28,.92);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-top:1px solid var(--line);
}
@media (min-width:1024px){
  .tabbar{display:none;}
}
.tab-item{
  position:relative;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:4px;
  font-size:10px;
  color:var(--t3);
  transition:color var(--dur) var(--ease);
}
.tab-item svg{width:22px;height:22px;stroke:currentColor;fill:none;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;}
.tab-item::before{
  content:"";
  position:absolute;
  top:0;left:50%;
  width:22px;height:2px;
  transform:translateX(-50%) scaleX(0);
  background:var(--brand-400);
  border-radius:2px;
  transition:transform var(--dur) var(--ease);
}
.tab-item.active{color:var(--brand-400);}
.tab-item.active::before{transform:translateX(-50%) scaleX(1);}
.tab-item:hover{color:var(--brand-400);}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .check-card:hover,.btn-primary:hover,.btn-ghost:hover{transform:none !important;}
}

/* roulang page: category4 */
:root{
  --ink-950:#05070E;
  --ink-900:#0A0F1C;
  --ink-800:#101827;
  --line:rgba(255,255,255,.08);
  --line-strong:rgba(255,255,255,.14);
  --brand-500:#1F6BFF;
  --brand-400:#4D8BFF;
  --brand-600:#1550CC;
  --accent-400:#2BE8B0;
  --signal-500:#FF5C4D;
  --text:#E9EEF7;
  --text-2:#9AA7BE;
  --text-3:#64718A;
  --r-card:18px;
  --r-lg:24px;
  --ease:cubic-bezier(.2,.8,.2,1);
  --shadow-card:0 12px 32px -18px rgba(0,0,0,.9);
  --glow:0 0 0 1px rgba(31,107,255,.55),0 10px 32px -10px rgba(31,107,255,.7);
  --mono:ui-monospace,"SF Mono",menlo,monospace;
}
html{scroll-behavior:smooth}
html body{
  margin:0;
  background:var(--ink-950);
  color:var(--text);
  font-family:-apple-system,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",sans-serif;
  font-size:16px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  padding-bottom:84px;
}
html a{color:inherit;text-decoration:none;transition:color .18s var(--ease)}
html img{max-width:100%;display:block}
html button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
html h1,html h2,html h3,html h4{margin:0;font-weight:700;color:var(--text);letter-spacing:-.01em}
html p{margin:0}
html ul,html ol{margin:0;padding:0;list-style:none}
html a:focus-visible,html button:focus-visible{outline:2px solid var(--brand-400);outline-offset:2px;border-radius:6px}

.container-x{max-width:1200px;margin:0 auto;padding:0 20px}
@media(min-width:768px){.container-x{padding:0 28px}}
@media(min-width:1024px){.container-x{padding:0 40px}}

/* Header */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(5,7,14,.72);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
  transition:background .24s var(--ease),box-shadow .24s var(--ease);
}
.site-header.is-scrolled{background:rgba(5,7,14,.9);box-shadow:0 10px 30px -22px rgba(0,0,0,.95)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;height:66px}
.logo{display:inline-flex;align-items:center;gap:10px;height:32px}
.logo-mark{width:30px;height:30px;color:var(--brand-400);flex:none}
.logo-text{display:inline-flex;align-items:baseline;gap:6px}
.logo-cn{font-size:18px;font-weight:700;letter-spacing:.04em}
.logo-en{font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--text-3);font-family:var(--mono)}
.main-nav{display:none}
@media(min-width:1024px){.main-nav{display:flex;align-items:center;gap:28px}}
.nav-link{position:relative;font-size:14px;color:var(--text-2);padding:6px 0}
.nav-link:hover{color:var(--accent-400)}
.nav-link.active{color:var(--brand-400)}
.nav-link.active::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;border-radius:2px;background:var(--brand-400)}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:44px;padding:0 22px;border-radius:999px;font-size:14px;font-weight:600;transition:transform .18s var(--ease),box-shadow .18s var(--ease),background .18s var(--ease),color .18s var(--ease);white-space:nowrap}
.btn-primary{background:linear-gradient(180deg,var(--brand-400),var(--brand-500));color:#fff;box-shadow:var(--glow)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 0 0 1px rgba(77,139,255,.7),0 14px 34px -6px rgba(31,107,255,.75)}
.btn-ghost{border:1px solid rgba(255,255,255,.16);background:rgba(255,255,255,.03);color:var(--text)}
.btn-ghost:hover{border-color:rgba(43,232,176,.55);color:var(--accent-400);transform:translateY(-2px)}
.btn-sm{height:36px;padding:0 16px;font-size:13px}
.btn-block{width:100%}
.header-cta{display:none}
@media(min-width:1024px){.header-cta{display:inline-flex}}

/* Mobile tab bar */
.tabbar{
  position:fixed;left:0;right:0;bottom:0;z-index:70;
  display:grid;grid-template-columns:repeat(5,1fr);
  height:64px;
  padding-bottom:env(safe-area-inset-bottom);
  background:rgba(10,15,28,.92);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-top:1px solid var(--line);
}
@media(min-width:1024px){.tabbar{display:none}html body{padding-bottom:0}}
.tab-item{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;font-size:10px;color:var(--text-3);transition:color .18s var(--ease)}
.tab-item svg{width:20px;height:20px}
.tab-item:hover{color:var(--brand-400)}
.tab-item.active{color:var(--brand-400)}
.tab-item.active::before{content:"";position:absolute;top:0;width:22px;height:2px;border-radius:2px;background:var(--brand-400)}

/* Hero */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line);background:var(--ink-950)}
.hero::before{content:"";position:absolute;inset:0;background:radial-gradient(58% 52% at 18% 0%,rgba(31,107,255,.18),transparent 72%);pointer-events:none}
.hero::after{content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:24px 24px;
  -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.9),transparent 72%);
  mask-image:linear-gradient(180deg,rgba(0,0,0,.9),transparent 72%);
}
.hero-inner{position:relative;z-index:1;padding:36px 0 56px}
@media(min-width:1024px){.hero-inner{padding:52px 0 76px}}
.hero-grid{display:grid;gap:32px}
@media(min-width:1024px){.hero-grid{grid-template-columns:1.08fr .92fr;align-items:center;gap:48px}}
.badge{display:inline-flex;align-items:center;gap:8px;height:30px;padding:0 14px;border-radius:999px;font-size:12px;letter-spacing:.02em;color:var(--brand-400);border:1px solid rgba(31,107,255,.35);background:rgba(31,107,255,.08)}
.badge .dot{width:6px;height:6px;border-radius:50%;background:var(--signal-500)}
.hero h1{margin-top:18px;font-size:clamp(28px,4.2vw,48px);line-height:1.18;letter-spacing:-.02em}
.hero-sub{margin-top:16px;font-size:16px;color:var(--text-2);max-width:36em}
@media(min-width:1024px){.hero-sub{font-size:18px}}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}
.hero-stats{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.stat{flex:1 1 120px;min-width:104px;padding:12px 14px;border-radius:12px;border:1px solid var(--line);background:var(--ink-800)}
.stat-num{display:block;font-family:var(--mono);font-variant-numeric:tabular-nums;font-size:22px;font-weight:700;color:var(--accent-400);line-height:1.2}
.stat-label{display:block;font-size:8px;letter-spacing:.12em;color:var(--text-3);margin-top:2px}
@media(min-width:768px){.stat-label{font-size:11px;letter-spacing:.04em}}
.hero-figure{position:relative;border-radius:var(--r-lg);overflow:hidden;border:1px solid rgba(255,255,255,.1);background:var(--ink-800);box-shadow:var(--shadow-card)}
.hero-figure img{width:100%;aspect-ratio:4/3;object-fit:cover;opacity:.92}
.hero-figure figcaption{position:absolute;left:0;right:0;bottom:0;padding:16px;font-size:12px;color:var(--text-2);background:linear-gradient(180deg,transparent,rgba(5,7,14,.92))}

/* Section shell */
.section{padding:56px 0}
@media(min-width:1024px){.section{padding:88px 0}}
.section-alt{background:var(--ink-900);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;flex-wrap:wrap;margin-bottom:28px}
.section-head h2{font-size:clamp(22px,2.6vw,30px);line-height:1.25}
.section-head p{margin-top:8px;font-size:14px;color:var(--text-2)}
.text-link{font-size:13px;color:var(--brand-400);display:inline-flex;align-items:center;gap:6px}
.text-link:hover{color:var(--accent-400)}

/* Breadcrumb */
.crumb{padding-top:20px}
.crumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:12px;color:var(--text-3)}
.crumb li{display:inline-flex;align-items:center;gap:8px}
.crumb li+li::before{content:"";width:0;height:0;border-left:4px solid var(--brand-400);border-top:3px solid transparent;border-bottom:3px solid transparent;opacity:.8}
.crumb a:hover{color:var(--accent-400)}
.crumb [aria-current]{color:var(--text-2)}

/* Article + sticky toc */
.page-grid{display:grid;gap:28px;align-items:start}
@media(min-width:1024px){.page-grid{grid-template-columns:minmax(0,1fr) 240px;gap:40px}}
.article-body{max-width:760px}
.article-body h2{font-size:clamp(21px,2.4vw,26px);line-height:1.35;margin-top:44px;padding-top:4px}
.article-body h2:first-of-type{margin-top:0}
.article-body h3{font-size:17px;margin-top:26px}
.article-body p{margin-top:16px;font-size:16px;line-height:1.85;color:var(--text-2)}
.article-body strong{color:var(--text);font-weight:600}
.article-body figure{margin:26px 0 0}
.article-body figure img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:14px;border:1px solid var(--line);box-shadow:var(--shadow-card)}
.article-body figcaption{margin-top:10px;font-size:12px;color:var(--text-3)}
.note-block{margin-top:24px;padding:16px 20px;border-left:3px solid var(--brand-500);background:rgba(31,107,255,.07);border-radius:0 12px 12px 0;color:var(--text-2);font-size:15px;line-height:1.8}
.point-list{margin-top:18px;display:grid;gap:12px}
.point-list li{position:relative;padding-left:20px;font-size:15px;color:var(--text-2);line-height:1.8}
.point-list li::before{content:"";position:absolute;left:0;top:11px;width:6px;height:6px;border-radius:2px;background:var(--accent-400);opacity:.85}
.check-list{margin-top:20px;display:grid;gap:14px;counter-reset:ck}
.check-list li{position:relative;padding:14px 16px 14px 54px;border:1px solid var(--line);border-radius:14px;background:var(--ink-800);font-size:15px;color:var(--text-2);line-height:1.8;box-shadow:var(--shadow-card)}
.check-list li::before{counter-increment:ck;content:counter(ck,decimal-leading-zero);position:absolute;left:16px;top:14px;font-family:var(--mono);font-size:15px;font-weight:700;color:var(--accent-400);letter-spacing:.06em}
.check-list li b{color:var(--text);font-weight:600}

.toc{position:static;border:1px solid var(--line);border-radius:16px;background:var(--ink-800);padding:16px;box-shadow:var(--shadow-card)}
@media(min-width:1024px){.toc{position:sticky;top:96px}}
.toc-title{font-size:12px;letter-spacing:.14em;color:var(--text-3);margin-bottom:12px}
.toc-list{display:flex;gap:8px;overflow-x:auto;padding-bottom:4px;scrollbar-width:none}
.toc-list::-webkit-scrollbar{display:none}
@media(min-width:1024px){.toc-list{display:block;overflow:visible;padding-bottom:0}}
.toc-list a{display:block;white-space:nowrap;font-size:13px;color:var(--text-2);padding:9px 12px;border-radius:10px;border-left:2px solid transparent;transition:color .18s var(--ease),background .18s var(--ease),border-color .18s var(--ease)}
@media(min-width:1024px){.toc-list a{white-space:normal;border-radius:0 8px 8px 0}}
.toc-list a:hover{color:var(--accent-400);background:rgba(31,107,255,.08);border-left-color:var(--brand-400)}

/* Visual cards */
.card-grid{display:grid;gap:16px}
@media(min-width:768px){.card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(min-width:1024px){.card-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
.vcard{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:var(--r-card);background:var(--ink-800);box-shadow:var(--shadow-card);overflow:hidden;transition:transform .18s var(--ease),border-color .18s var(--ease)}
.vcard:hover{transform:translateY(-2px);border-color:rgba(77,139,255,.4)}
.vcard img{width:100%;aspect-ratio:16/10;object-fit:cover}
.vcard-body{padding:18px}
.tag{display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:999px;font-size:11px;color:var(--accent-400);background:rgba(43,232,176,.1);border:1px solid rgba(43,232,176,.25)}
.vcard h3{margin-top:12px;font-size:16px;line-height:1.5}
.vcard p{margin-top:8px;font-size:13px;color:var(--text-2);line-height:1.75;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* FAQ */
.faq-panel{border:1px solid var(--line);border-radius:var(--r-card);background:var(--ink-800);box-shadow:var(--shadow-card);overflow:hidden}
.faq-item+ .faq-item{border-top:1px solid var(--line)}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;text-align:left;padding:18px 20px;font-size:15px;color:var(--text);transition:background .18s var(--ease)}
.faq-q:hover{background:rgba(31,107,255,.06)}
.faq-icon{position:relative;width:16px;height:16px;flex:none;transition:transform .24s var(--ease)}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;background:var(--brand-400);border-radius:2px}
.faq-icon::before{left:0;right:0;top:7px;height:2px}
.faq-icon::after{top:0;bottom:0;left:7px;width:2px;transition:opacity .24s var(--ease),transform .24s var(--ease)}
.faq-item.open .faq-icon{transform:rotate(180deg)}
.faq-item.open .faq-icon::after{opacity:0;transform:scaleY(.2)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s var(--ease)}
.faq-item.open .faq-a{max-height:340px}
.faq-a p{padding:0 20px 20px;font-size:14px;line-height:1.85;color:var(--text-2);max-width:720px}

/* CTA */
.cta-panel{position:relative;overflow:hidden;border-radius:var(--r-lg);border:1px solid rgba(255,255,255,.08);background:rgba(255,255,255,.045);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);box-shadow:0 20px 50px -30px rgba(0,0,0,.95)}
.cta-panel::before{content:"";position:absolute;inset:0;background:url(/assets/images/backpic/back-2.png) center/cover no-repeat;opacity:.12;pointer-events:none}
.cta-panel::after{content:"";position:absolute;inset:0;pointer-events:none;background:radial-gradient(50% 70% at 80% 100%,rgba(31,107,255,.18),transparent 70%)}
.cta-inner{position:relative;z-index:1;display:grid;gap:28px;padding:28px}
@media(min-width:1024px){.cta-inner{grid-template-columns:1.5fr 1fr;align-items:center;padding:40px;gap:40px}}
.cta-inner h2{font-size:clamp(21px,2.4vw,28px);line-height:1.3}
.cta-inner .lead{margin-top:10px;font-size:14px;color:var(--text-2)}
.steps{display:grid;gap:16px;margin-top:26px}
@media(min-width:768px){.steps{grid-template-columns:repeat(3,1fr);gap:0}}
.step{position:relative;padding-right:16px}
@media(min-width:768px){.step{padding:0 18px 0 0}.step::after{content:"";position:absolute;left:0;right:14px;top:9px;height:1px;background:rgba(255,255,255,.14);z-index:0}}
.step-num{position:relative;z-index:1;display:inline-flex;align-items:center;justify-content:center;width:20px;height:20px;border-radius:50%;border:1px solid rgba(43,232,176,.5);font-family:var(--mono);font-size:11px;color:var(--accent-400);background:var(--ink-900)}
.step-title{display:block;margin-top:10px;font-size:14px;font-weight:600;color:var(--text)}
.step-desc{display:block;margin-top:6px;font-size:11px;color:var(--text-3);line-height:1.6}
.cta-side{display:flex;flex-direction:column;gap:12px}
.cta-note{font-size:12px;color:var(--text-3);text-align:center}

/* Footer */
.site-footer{border-top:1px solid var(--line);background:var(--ink-900);padding:48px 0 24px;margin-top:8px}
.foot-grid{display:grid;gap:32px}
@media(min-width:768px){.foot-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.foot-grid{grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px}}
.foot-desc{margin-top:14px;font-size:13px;line-height:1.8;color:var(--text-2);max-width:32em}
.foot-title{font-size:13px;font-weight:600;color:var(--text);opacity:.75;margin-bottom:14px}
.foot-links{display:flex;flex-direction:column;gap:10px}
.foot-link{font-size:13px;color:var(--text-2);line-height:1.6}
a.foot-link:hover{color:var(--accent-400)}
.foot-bottom{display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;margin-top:36px;padding-top:20px;border-top:1px solid var(--line);font-size:12px;color:var(--text-3);font-family:var(--mono)}

@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  .vcard:hover,.btn:hover{transform:none}
}