/* roulang page: index */
:root{
  --bg-deep:#08101E;
  --bg-body:#0B1525;
  --surface:#0F1B2C;
  --surface-soft:rgba(255,255,255,0.035);
  --glass:rgba(255,255,255,0.055);
  --glass-bright:rgba(255,255,255,0.09);
  --line:rgba(255,255,255,0.08);
  --line-strong:rgba(255,255,255,0.14);
  --white:#F3F7FF;
  --text:#B7C4DB;
  --muted:#8494AB;
  --weak:rgba(255,255,255,0.42);
  --blue:#3E8BFF;
  --blue-soft:#63A6FF;
  --cyan:#21E6C1;
  --amber:#F5B85A;
  --glass-radius:16px;
  --radius:12px;
  --radius-small:6px;
  --shadow-card:0 16px 40px rgba(2,6,18,0.38);
  --shadow-glow:0 0 0 1px rgba(62,139,255,0.35), 0 0 24px rgba(62,139,255,0.22);
  --font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue","PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  font-family:var(--font);
  background:var(--bg-deep);
  color:var(--text);
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-2;
  background:
    radial-gradient(1100px 420px at 85% -80px, rgba(62,139,255,0.10), transparent 60%),
    radial-gradient(780px 340px at 5% 30%, rgba(33,230,193,0.045), transparent 60%),
    radial-gradient(700px 500px at 95% 65%, rgba(245,184,90,0.025), transparent 60%);
  pointer-events:none;
}
body.no-scroll{overflow:hidden;}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
a:hover{color:var(--cyan);}
button{font-family:inherit;}
.container{
  max-width:1200px;
  margin:0 auto;
  padding-left:clamp(20px,4vw,40px);
  padding-right:clamp(20px,4vw,40px);
}
.section-block{
  padding:clamp(4.5rem,8vw,7rem) 0;
}
.section-block + .section-block{border-top:1px solid rgba(255,255,255,0.05);}
.section-head{
  max-width:900px;
  margin-bottom:clamp(2.2rem,4vw,3.6rem);
}
.section-kicker{
  display:inline-flex;
  align-items:center;
  gap:8px;
  color:var(--cyan);
  font-size:0.875rem;
  letter-spacing:0.08em;
  margin:0 0 12px;
}
.section-kicker::before{
  content:"";
  width:22px;
  height:2px;
  background:var(--cyan);
  border-radius:2px;
}
.section-title{
  margin:0;
  font-size:clamp(1.5rem,3vw,2.4rem);
  line-height:1.25;
  color:var(--white);
  letter-spacing:-0.02em;
  font-weight:800;
}
.section-desc{
  margin:14px 0 0;
  max-width:780px;
  color:var(--muted);
  font-size:clamp(1rem,1.6vw,1.125rem);
}

/* Header */
.header{
  position:sticky;
  top:0;
  z-index:100;
  background:rgba(8,16,30,0.78);
  -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;
  min-height:72px;
  gap:16px;
}
.brand{
  display:inline-flex;
  align-items:center;
  white-space:nowrap;
  font-size:clamp(1rem,2vw,1.15rem);
  font-weight:800;
  color:var(--white);
  letter-spacing:0.01em;
}
.brand::before{
  content:"";
  width:9px;
  height:9px;
  border-radius:50%;
  background:var(--cyan);
  margin-right:10px;
  box-shadow:0 0 14px rgba(33,230,193,0.9);
}
.main-nav{
  display:flex;
  align-items:center;
  gap:clamp(12px,2.6vw,36px);
}
.main-nav a{
  position:relative;
  padding:10px 2px;
  font-size:0.925rem;
  color:var(--muted);
  font-weight:500;
  transition:color 0.25s ease;
  white-space:nowrap;
}
.main-nav a:hover{
  color:var(--white);
}
.main-nav a.active{
  color:var(--white);
  font-weight:600;
}
.main-nav a.active::after,
.main-nav a:hover::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:2px;
  height:4px;
  border-radius:4px;
  background:var(--cyan);
  width:auto;
  max-width:30px;
  margin:0 auto;
  opacity:0.9;
  box-shadow:0 0 12px rgba(33,230,193,0.6);
  transition:opacity 0.2s ease;
}
.main-nav a.active::after{
  opacity:1;
}
.header-login{
  display:block;
  font-size:0.9rem;
  color:var(--white);
  border-bottom:1px solid rgba(255,255,255,0.5);
  line-height:1.6;
  white-space:nowrap;
  transition:border-color 0.2s, color 0.2s;
}
.header-login:hover{
  color:var(--cyan);
  border-color:var(--cyan);
}
.menu-toggle{
  display:none;
  border:0;
  background:transparent;
  color:var(--white);
  font-size:0.925rem;
  padding:8px 0;
  cursor:pointer;
  border-bottom:1px solid transparent;
}
.menu-toggle:hover{
  border-bottom-color:var(--cyan);
}
.mobile-drawer{
  display:none;
}
@media(max-width:900px){
  .main-nav{display:none;}
  .header-login-desktop{display:none;}
  .menu-toggle{display:block;}
  .mobile-drawer{
    display:block;
    max-height:0;
    overflow:hidden;
    background:rgba(8,16,30,0.94);
    border-top:1px solid var(--line);
    transition:max-height 0.35s ease;
  }
  .mobile-drawer.open{max-height:460px;}
  .mobile-drawer-inner{
    display:flex;
    flex-direction:column;
    padding:20px 0 30px;
  }
  .mobile-drawer a{
    display:block;
    padding:14px 0;
    border-bottom:1px solid rgba(255,255,255,0.05);
    color:var(--text);
    font-size:1.05rem;
  }
  .mobile-drawer a.active{
    color:var(--white);
    font-weight:700;
  }
  .mobile-drawer .drawer-cta{
    color:var(--cyan);
    border-bottom:0;
    margin-top:10px;
  }
}

/* Buttons */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:48px;
  padding:0 24px;
  border-radius:var(--radius);
  border:0;
  font-size:0.975rem;
  font-weight:600;
  cursor:pointer;
  transition:transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
  text-decoration:none;
}
.btn:focus-visible,
a:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:2px;
}
.btn-primary{
  background:linear-gradient(135deg,#246AFF 0%,#1DAF9E 100%);
  color:#06231F;
  box-shadow:0 0 0 1px rgba(62,139,255,0.2), 0 10px 30px rgba(33,230,193,0.18);
}
.btn-primary:hover{
  color:#06231F;
  transform:translateY(-1px);
  box-shadow:0 0 0 1px rgba(62,139,255,0.3), 0 0 34px rgba(33,230,193,0.3);
}
.btn-secondary{
  background:transparent;
  color:var(--white);
  border:1px solid var(--line-strong);
  box-shadow:none;
}
.btn-secondary:hover{
  border-color:var(--cyan);
  color:var(--cyan);
  transform:translateX(2px);
}
.btn-block{width:100%;}

/* Hero */
.hero{
  position:relative;
  background:
    linear-gradient(104deg, rgba(8,16,30,0.95) 4%, rgba(8,16,30,0.72) 58%, rgba(10,24,40,0.88) 100%),
    url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
  border-bottom:1px solid rgba(255,255,255,0.06);
  overflow:hidden;
}
.hero::before{
  content:"";
  position:absolute;
  width:420px;
  height:420px;
  right:-120px;
  top:-120px;
  border-radius:50%;
  border:1px solid rgba(62,139,255,0.2);
  pointer-events:none;
}
.hero::after{
  content:"";
  position:absolute;
  width:560px;
  height:560px;
  right:-260px;
  top:-260px;
  border-radius:50%;
  border:1px dashed rgba(33,230,193,0.18);
  pointer-events:none;
}
.hero-inner{
  position:relative;
  z-index:2;
  display:grid;
  grid-template-columns:1.14fr 0.86fr;
  gap:clamp(28px,5vw,72px);
  align-items:center;
  padding:clamp(74px,8vw,120px) 0 clamp(70px,7vw,100px);
}
.hero-copy .hero-badge{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:7px 14px;
  border:1px solid rgba(33,230,193,0.3);
  border-radius:50px;
  color:var(--cyan);
  font-size:0.825rem;
  background:rgba(33,230,193,0.06);
  margin-bottom:22px;
}
.hero-copy h1{
  font-size:clamp(2rem,4.6vw,3.6rem);
  line-height:1.15;
  letter-spacing:-0.02em;
  color:var(--white);
  margin:0 0 22px;
  font-weight:800;
}
.hero-copy .hero-lead{
  font-size:clamp(1rem,1.7vw,1.15rem);
  line-height:1.9;
  color:var(--text);
  max-width:620px;
  margin:0 0 32px;
}
.hero-actions{
  display:flex;
  flex-wrap:wrap;
  gap:14px;
  align-items:center;
  padding-bottom:24px;
}
.hero-trust{
  display:flex;
  flex-wrap:wrap;
  gap:12px 20px;
  margin-top:10px;
  color:var(--muted);
  font-size:0.86rem;
  border-top:1px solid rgba(255,255,255,0.06);
  padding-top:20px;
  max-width:600px;
}
.hero-trust span{
  display:inline-flex;
  align-items:center;
  gap:6px;
}
.hero-trust svg{
  width:15px;
  height:15px;
  stroke:var(--cyan);
  flex:none;
}
.hero-panel-wrap{
  display:flex;
  justify-content:flex-end;
}
.hero-panel{
  width:100%;
  max-width:460px;
  padding:28px;
  background:
    linear-gradient(135deg, rgba(255,255,255,0.075), rgba(255,255,255,0.035)),
    rgba(6,13,24,0.52);
  border:1px solid rgba(255,255,255,0.10);
  border-radius:24px;
  box-shadow:var(--shadow-card);
  position:relative;
  overflow:hidden;
}
.hero-panel::before{
  content:"";
  position:absolute;
  left:0; top:0; right:0;
  height:1px;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,0.38),transparent);
}
.panel-head{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:16px;
  margin-bottom:20px;
}
.panel-head .status{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:6px 12px;
  background:rgba(33,230,193,0.1);
  color:var(--cyan);
  border-radius:50px;
  font-size:0.78rem;
  border:1px solid rgba(33,230,193,0.2);
}
.panel-head .status::before{
  content:"";
  width:6px;
  height:6px;
  background:var(--cyan);
  border-radius:50%;
}
.panel-title{
  font-size:1.15rem;
  font-weight:700;
  color:var(--white);
  margin:0;
}
.panel-sub{
  color:var(--muted);
  font-size:0.88rem;
  margin:12px 0 22px;
}
.panel-rows{
  display:flex;
  flex-direction:column;
  gap:12px;
}
.panel-row{
  display:flex;
  align-items:center;
  gap:14px;
  padding:15px 16px;
  background:rgba(255,255,255,0.055);
  border:1px solid rgba(255,255,255,0.08);
  border-radius:var(--radius);
}
.panel-row .row-icon{
  width:38px;
  height:38px;
  border-radius:10px;
  display:flex;
  align-items:center;
  justify-content:center;
  background:rgba(62,139,255,0.16);
  color:var(--blue-soft);
  flex:none;
}
.panel-row .row-icon svg{
  width:19px;
  height:19px;
}
.panel-row strong{
  display:block;
  color:var(--white);
  font-size:0.92rem;
  font-weight:600;
  line-height:1.4;
}
.panel-row span{
  display:block;
  color:var(--muted);
  font-size:0.82rem;
  line-height:1.5;
  margin-top:2px;
}
@media(max-width:1024px){
  .hero-inner{grid-template-columns:1fr;padding:76px 0 90px;}
  .hero-panel-wrap{justify-content:flex-start;}
  .hero-panel{max-width:560px;}
}
@media(max-width:480px){
  .hero-actions .btn{width:100%;}
  .hero-panel{padding:22px;}
}

/* Split service */
.split-gate{
  display:grid;
  grid-template-columns:1.6fr 1fr;
  gap:20px;
  margin-bottom:20px;
}
.split-card{
  padding:clamp(24px,3.6vw,42px);
  border-radius:var(--glass-radius);
  background:var(--glass);
  border:1px solid rgba(255,255,255,0.09);
  position:relative;
  overflow:hidden;
}
.split-card.large{
  background:linear-gradient(135deg, rgba(62,139,255,0.12), rgba(255,255,255,0.04)), rgba(7,15,28,0.65);
}
.split-card.large::after{
  content:"";
  position:absolute;
  width:190px;
  height:190px;
  right:-70px;
  bottom:-80px;
  border-radius:50%;
  border:1px solid rgba(62,139,255,0.2);
  pointer-events:none;
}
.split-card .tag-chip{
  display:inline-block;
  background:rgba(62,139,255,0.16);
  color:var(--blue-soft);
  border-radius:50px;
  padding:4px 12px;
  font-size:0.78rem;
  letter-spacing:0.04em;
  margin-bottom:16px;
}
.split-card.large .tag-chip{
  background:rgba(33,230,193,0.1);
  color:var(--cyan);
  border-color:rgba(33,230,193,0.2);
}
.split-card h3{
  font-size:clamp(1.2rem,2vw,1.55rem);
  color:var(--white);
  margin:0 0 14px;
  line-height:1.35;
  font-weight:700;
  letter-spacing:-0.01em;
}
.split-card p{
  color:var(--muted);
  margin:0 0 20px;
  font-size:0.96rem;
}
.split-card .link-arrow{
  display:inline-flex;
  align-items:center;
  gap:7px;
  font-weight:600;
  color:var(--cyan);
  font-size:0.92rem;
}
.split-list{
  list-style:none;
  margin:0 0 22px;
  padding:0;
}
.split-list li{
  display:flex;
  gap:12px;
  color:var(--text);
  font-size:0.925rem;
  padding:7px 0;
}
.split-list li::before{
  content:"";
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--cyan);
  margin-top:10px;
  flex:none;
}
.qr-placeholder{
  width:118px;
  height:118px;
  border-radius:14px;
  background:rgba(255,255,255,0.94);
  padding:8px;
  margin-top:16px;
  position:relative;
}
.qr-placeholder .qr-grid{
  width:100%;
  height:100%;
  background-image:
    linear-gradient(rgba(10,20,30,0.5) 1px, transparent 1px),
    linear-gradient(90deg, rgba(10,20,30,0.5) 1px, transparent 1px);
  background-size:12px 12px;
  border-radius:6px;
  position:relative;
  overflow:hidden;
}
.qr-placeholder .qr-grid::before,
.qr-placeholder .qr-grid::after{
  content:"";
  position:absolute;
  background:rgba(9,15,30,0.95);
}
.qr-placeholder .qr-grid::before{
  width:18px;height:18px;left:8px;top:8px;border-radius:3px;
  box-shadow:38px 0 0 rgba(9,15,30,0.95), 0 38px 0 rgba(9,15,30,0.95);
}
.qr-placeholder .qr-grid::after{
  content:"";
  width:30px;height:30px;right:8px;bottom:8px;
  background:conic-gradient(from 90deg, transparent 25%,#091A2B 0 50%,transparent 0 75%,#091A2B 0);
  opacity:0.7;
}
.app-scan-note{
  color:var(--weak);
  font-size:0.82rem;
  margin-top:8px;
}
@media(max-width:900px){
  .split-gate{grid-template-columns:1fr;}
}

/* List-entry pair */
.entry-pair{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:20px;
}
.entry-card{
  position:relative;
  min-height:240px;
  border-radius:var(--glass-radius);
  overflow:hidden;
  border:1px solid rgba(255,255,255,0.09);
  background:var(--surface-soft);
  display:flex;
  align-items:flex-end;
}
.entry-card img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
  opacity:0.7;
  transition:transform 0.5s ease, opacity 0.5s ease;
}
.entry-card:hover img{
  transform:scale(1.025);
  opacity:0.55;
}
.entry-card::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg, transparent 20%, rgba(4,10,20,0.92) 98%);
}
.entry-body{
  position:relative;
  z-index:2;
  padding:clamp(24px,3vw,32px);
  color:var(--white);
}
.entry-body h3{
  font-size:1.2rem;
  margin:0 0 8px;
  font-weight:700;
}
.entry-body p{
  margin:0 0 16px;
  color:rgba(255,255,255,0.78);
  font-size:0.91rem;
  max-width:480px;
}
.entry-body .entry-link{
  color:var(--cyan);
  font-weight:600;
  font-size:0.9rem;
  display:inline-flex;
  gap:6px;
  align-items:center;
}
.entry-featured{grid-column:span 2;min-height:360px;}
@media(max-width:820px){
  .entry-pair{grid-template-columns:1fr;}
  .entry-featured{grid-column:auto;min-height:260px;}
}

/* Feature stats */
.stats-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:18px;
}
.stat-item{
  background:rgba(255,255,255,0.045);
  border:1px solid rgba(255,255,255,0.07);
  border-radius:var(--glass-radius);
  padding:26px 22px;
  min-height:170px;
  transition:border-color 0.3s ease, background 0.3s ease;
}
.stat-item:hover{
  border-color:rgba(33,230,193,0.4);
  background:rgba(33,230,193,0.04);
}
.stat-icon{
  width:40px;
  height:40px;
  margin-bottom:18px;
  border-radius:10px;
  display:flex;
  align-items:center;
  justify-content:center;
  color:var(--cyan);
  background:rgba(33,230,193,0.08);
  border:1px solid rgba(33,230,193,0.1);
}
.stat-icon svg{
  width:21px;
  height:21px;
}
.stat-item h3{
  color:var(--white);
  font-size:1.02rem;
  margin:0 0 8px;
  font-weight:700;
}
.stat-item p{
  color:var(--muted);
  margin:0;
  font-size:0.86rem;
  line-height:1.7;
}
@media(max-width:1024px){
  .stats-grid{grid-template-columns:repeat(2,1fr);}
}
@media(max-width:540px){
  .stats-grid{grid-template-columns:1fr;}
}

/* CMS news */
.news-section{
  background:rgba(7,13,25,0.6);
  border-top:1px solid rgba(255,255,255,0.05);
  border-bottom:1px solid rgba(255,255,255,0.05);
}
.news-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:20px;
}
.news-card{
  display:flex;
  flex-direction:column;
  min-height:250px;
  padding:clamp(22px,3vw,28px);
  background:rgba(255,255,255,0.05);
  border:1px solid rgba(255,255,255,0.08);
  border-radius:var(--glass-radius);
  transition:transform 0.3s ease, border-color 0.3s ease, background 0.3s ease;
}
.news-card:hover{
  transform:translateY(-3px);
  border-color:rgba(62,139,255,0.45);
  background:rgba(255,255,255,0.07);
}
.news-card-head{
  display:flex;
  justify-content:space-between;
  gap:12px;
  align-items:center;
  margin-bottom:16px;
}
.news-tag{
  display:inline-block;
  padding:3px 11px;
  border-radius:50px;
  font-size:0.76rem;
  color:var(--cyan);
  background:rgba(33,230,193,0.09);
  border:1px solid rgba(33,230,193,0.18);
}
.news-date{
  color:var(--weak);
  font-size:0.8rem;
  white-space:nowrap;
}
.news-card h3{
  font-size:1.16rem;
  line-height:1.55;
  color:var(--white);
  margin:0 0 12px;
  font-weight:700;
  letter-spacing:-0.01em;
}
.news-card p{
  color:var(--muted);
  font-size:0.91rem;
  line-height:1.8;
  margin:0 0 18px;
  flex:1;
  display:-webkit-box;
  -webkit-line-clamp:3;
  -webkit-box-orient:vertical;
  overflow:hidden;
}
.news-more{
  color:var(--blue-soft);
  font-size:0.86rem;
  font-weight:600;
  display:inline-flex;
  align-items:center;
  gap:6px;
  margin-top:auto;
}
.news-more::after{
  content:"→";
  transition:transform 0.25s ease;
}
.news-card:hover .news-more{
  color:var(--cyan);
}
.news-card:hover .news-more::after{
  transform:translateX(4px);
}
.news-empty{
  max-width:720px;
  margin:0 auto;
  padding:38px 24px;
  text-align:center;
  background:rgba(255,255,255,0.04);
  border:1px dashed rgba(255,255,255,0.14);
  border-radius:var(--radius);
  color:var(--muted);
  font-size:0.96rem;
}
@media(max-width:760px){
  .news-grid{grid-template-columns:1fr;}
}

/* Login steps */
.steps-wrap{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:0;
  position:relative;
}
.steps-wrap::before{
  content:"";
  position:absolute;
  top:26px;
  left:10%;
  right:10%;
  height:1px;
  background:linear-gradient(90deg, transparent, rgba(33,230,193,0.25), rgba(62,139,255,0.25), transparent);
}
.step-item{
  position:relative;
  padding:0 clamp(8px,1.4vw,20px);
}
.step-no{
  width:52px;
  height:52px;
  border-radius:50%;
  background:#0D1A2E;
  border:1px solid rgba(33,230,193,0.45);
  color:var(--cyan);
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight:800;
  font-size:1.15rem;
  box-shadow:0 0 18px rgba(33,230,193,0.1);
  margin-bottom:18px;
  position:relative;
  z-index:2;
}
.step-item h3{
  color:var(--white);
  font-size:1.02rem;
  margin:0 0 10px;
  font-weight:700;
}
.step-item p{
  color:var(--muted);
  margin:0;
  font-size:0.89rem;
  line-height:1.8;
}
@media(max-width:900px){
  .steps-wrap{grid-template-columns:1fr 1fr;gap:24px 16px;}
  .steps-wrap::before{display:none;}
}
@media(max-width:540px){
  .steps-wrap{grid-template-columns:1fr;}
}

/* FAQ */
.faq-layout{
  display:grid;
  grid-template-columns:1fr 1.6fr;
  gap:48px;
  align-items:start;
}
.faq-aside{
  position:sticky;
  top:110px;
}
.faq-aside .desc{
  color:var(--muted);
  margin:0 0 22px;
}
.faq-aside .help-link{
  color:var(--cyan);
}
.faq-list{
  display:flex;
  flex-direction:column;
}
.faq-item{
  border-bottom:1px solid rgba(255,255,255,0.08);
}
.faq-item:last-child{border-bottom:0;}
.faq-item summary{
  list-style:none;
  cursor:pointer;
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:20px;
  padding:20px 4px;
  color:var(--white);
  font-weight:600;
  font-size:1rem;
  line-height:1.6;
  transition:color 0.2s;
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary:hover{color:var(--cyan);}
.faq-item summary .faq-icon{
  flex:none;
  width:26px;
  height:26px;
  border:1px solid rgba(255,255,255,0.22);
  border-radius:50%;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  position:relative;
  transition:border-color 0.2s, background 0.2s, transform 0.3s;
}
.faq-item summary .faq-icon::before,
.faq-item summary .faq-icon::after{
  content:"";
  position:absolute;
  width:10px;
  height:1.5px;
  background:var(--muted);
}
.faq-item summary .faq-icon::after{
  transform:rotate(90deg);
}
.faq-item[open] summary .faq-icon{
  transform:rotate(45deg);
  border-color:var(--cyan);
}
.faq-item[open] summary .faq-icon::before,
.faq-item[open] summary .faq-icon::after{
  background:var(--cyan);
}
.faq-body{
  padding:0 18px 22px 4px;
  color:var(--muted);
  font-size:0.935rem;
  line-height:1.9;
}
@media(max-width:900px){
  .faq-layout{grid-template-columns:1fr;}
  .faq-aside{position:static;}
}

/* CTA */
.cta-strip{
  position:relative;
  border-radius:24px;
  overflow:hidden;
  padding:clamp(46px,7vw,84px) clamp(22px,5vw,70px);
  border:1px solid rgba(255,255,255,0.1);
  background:
    linear-gradient(110deg, rgba(8,16,30,0.94), rgba(8,16,30,0.66)),
    url('/assets/images/backpic/back-3.png') center / cover no-repeat;
  text-align:center;
}
.cta-strip::before{
  content:"";
  position:absolute;
  width:330px;height:330px;
  border-radius:50%;
  border:1px dashed rgba(62,139,255,0.4);
  bottom:-180px;left:-80px;
}
.cta-strip .cta-label{
  color:var(--cyan);
  letter-spacing:0.1em;
  font-size:0.84rem;
}
.cta-strip h2{
  color:var(--white);
  font-size:clamp(1.6rem,3.4vw,2.5rem);
  font-weight:800;
  margin:12px auto 12px;
  max-width:760px;
  line-height:1.35;
}
.cta-strip p{
  color:var(--muted);
  max-width:700px;
  margin:0 auto 30px;
}
.cta-strip .btn{margin-top:6px;}

/* footer */
.footer{
  background:rgba(5,10,20,0.92);
  border-top:1px solid rgba(255,255,255,0.06);
  margin-top:clamp(4rem,8vw,7rem);
  padding:56px 0 0;
}
.footer-top{
  display:grid;
  grid-template-columns:1.3fr 1fr 1fr 1fr;
  gap:clamp(24px,5vw,60px);
  padding-bottom:44px;
}
.footer-brand{
  font-size:1.05rem;
  font-weight:700;
  color:var(--white);
  display:block;
  margin-bottom:16px;
}
.footer-brand::before{
  content:"";
  display:inline-block;
  width:8px;
  height:8px;
  border-radius:50%;
  background:var(--cyan);
  margin-right:8px;
  vertical-align:middle;
  box-shadow:0 0 12px rgba(33,230,193,0.7);
}
.footer-desc{
  color:var(--muted);
  font-size:0.88rem;
  line-height:1.9;
  margin:0;
}
.footer-title{
  color:var(--white);
  font-size:0.92rem;
  font-weight:600;
  margin:0 0 18px;
}
.footer-links{
  margin:0;
  padding:0;
  list-style:none;
  display:flex;
  flex-direction:column;
  gap:9px;
}
.footer-links a{
  color:var(--muted);
  font-size:0.86rem;
  transition:color 0.2s, padding-left 0.2s;
}
.footer-links a:hover{
  color:var(--cyan);
  padding-left:3px;
}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,0.05);
  padding:22px 0 28px;
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  align-items:center;
  gap:12px;
}
.footer-bottom p{
  margin:0;
  color:var(--weak);
  font-size:0.78rem;
  line-height:1.7;
}
.footer-bottom a{
  color:var(--whites,var(--muted));
}
.footer-support{
  margin-top:18px;
  padding-top:16px;
  border-top:1px dashed rgba(255,255,255,0.07);
  display:flex;
  flex-wrap:wrap;
  gap:7px 18px;
  font-size:0.82rem;
  color:var(--muted);
}
.footer-support span::before{
  content:"·";
  color:var(--weak);
  margin-right:7px;
}
@media(max-width:1024px){
  .footer-top{grid-template-columns:1fr 1fr;}
}
@media(max-width:640px){
  .footer-top{grid-template-columns:1fr;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
}

/* utilities */
.section-stats{background:rgba(11,21,37,0.5);}
.section-scenes{background:rgba(5,11,21,0.4);}
.section-steps{background:linear-gradient(90deg, rgba(62,139,255,0.04), transparent);}
@media(prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important;}
  html{scroll-behavior:auto;}
}

/* roulang page: article */
:root{
    --bg-deep:#060B14;
    --bg:#08101E;
    --bg-2:#0B1525;
    --bg-soft:rgba(255,255,255,.055);
    --bg-soft-2:rgba(255,255,255,.03);
    --border:rgba(255,255,255,.10);
    --border-strong:rgba(255,255,255,.16);
    --panel:rgba(255,255,255,.07);
    --text:#F3F7FF;
    --text-body:#B7C4DB;
    --text-muted:#8494AB;
    --text-weak:rgba(255,255,255,.42);
    --primary:#3E8BFF;
    --primary-light:#63A6FF;
    --cyan:#21E6C1;
    --amber:#F5B85A;
    --danger:#FF7A7A;
    --radius-sm:6px;
    --radius-md:12px;
    --radius-lg:16px;
    --radius-xl:24px;
    --shadow-card:0 10px 30px rgba(3,8,18,.28);
    --shadow-glass:0 18px 40px rgba(2,6,18,.38);
    --shadow-primary:0 0 0 1px rgba(62,139,255,.35),0 0 24px rgba(62,139,255,.25);
    --font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue","PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
}
*,*::before,*::after{
    box-sizing:border-box;
}
html{
    scroll-behavior:smooth;
}
body{
    margin:0;
    background:var(--bg);
    color:var(--text-body);
    font-family:var(--font);
    font-size:16px;
    line-height:1.75;
    -webkit-font-smoothing:antialiased;
    text-rendering:optimizeLegibility;
}
img{
    max-width:100%;
    height:auto;
    display:block;
}
a{
    color:inherit;
    text-decoration:none;
}
button,input,textarea,select{
    font:inherit;
}
ul,ol{
    margin:0;
    padding:0;
}
h1,h2,h3,h4,h5,h6{
    margin:0;
    color:var(--text);
    font-weight:700;
    line-height:1.3;
}
p{
    margin:0;
}
:focus-visible{
    outline:2px solid var(--cyan);
    outline-offset:2px;
    border-radius:4px;
}
.container{
    width:100%;
    max-width:1200px;
    margin-left:auto;
    margin-right:auto;
    padding-left:clamp(20px,3vw,32px);
    padding-right:clamp(20px,3vw,32px);
}

/* header */
.header{
    position:sticky;
    top:0;
    z-index:100;
    background:rgba(8,16,30,.78);
    -webkit-backdrop-filter:blur(14px);
    backdrop-filter:blur(14px);
    border-bottom:1px solid var(--border);
}
.header-inner{
    display:flex;
    align-items:center;
    justify-content:space-between;
    min-height:72px;
    gap:20px;
}
.brand{
    font-size:1.04rem;
    font-weight:800;
    color:var(--text);
    letter-spacing:.01em;
    white-space:nowrap;
    transition:color .2s ease;
}
.brand:hover{
    color:var(--cyan);
}
.main-nav{
    display:flex;
    align-items:center;
    gap:clamp(20px,2.6vw,34px);
}
.main-nav a{
    position:relative;
    display:inline-flex;
    align-items:center;
    min-height:72px;
    color:var(--text-muted);
    font-size:.95rem;
    font-weight:500;
    letter-spacing:.02em;
    transition:color .2s ease;
}
.main-nav a:hover{
    color:var(--text);
}
.main-nav a::after{
    content:"";
    position:absolute;
    left:50%;
    bottom:10px;
    width:6px;
    height:6px;
    border-radius:50%;
    background:var(--cyan);
    transform:translateX(-50%) scale(.4);
    opacity:0;
    transition:opacity .2s ease,transform .2s ease;
}
.main-nav a.active{
    color:var(--text);
}
.main-nav a.active::after{
    opacity:1;
    transform:translateX(-50%) scale(1);
}
.header-login{
    color:var(--text);
    font-size:.9rem;
    border-bottom:1px solid rgba(255,255,255,.4);
    padding-bottom:2px;
    white-space:nowrap;
    transition:color .2s ease,border-color .2s ease;
}
.header-login:hover{
    color:var(--cyan);
    border-color:var(--cyan);
}
.menu-toggle{
    display:none;
    background:none;
    color:var(--text);
    border:1px solid var(--border);
    border-radius:8px;
    padding:7px 14px;
    cursor:pointer;
    font-size:.88rem;
    transition:border-color .2s ease,color .2s ease;
}
.menu-toggle:hover{
    color:var(--cyan);
    border-color:var(--cyan);
}
.mobile-drawer{
    display:grid;
    grid-template-rows:0fr;
    overflow:hidden;
    background:rgba(8,16,30,.96);
    border-bottom:1px solid transparent;
    transition:grid-template-rows .3s ease,border-color .3s ease;
}
.mobile-drawer.open{
    grid-template-rows:1fr;
    border-bottom-color:var(--border);
}
.mobile-drawer-inner{
    min-height:0;
    overflow:hidden;
    display:flex;
    flex-direction:column;
    padding:0;
}
.mobile-drawer-inner a{
    display:block;
    padding:12px 0;
    color:var(--text-body);
    border-bottom:1px solid rgba(255,255,255,.06);
    font-size:1rem;
    transition:color .2s ease,padding-left .2s ease;
}
.mobile-drawer-inner a:hover{
    color:var(--text);
    padding-left:4px;
}
.mobile-drawer-inner a.active{
    color:var(--cyan);
}
.mobile-drawer-inner .drawer-cta{
    margin-top:14px;
    margin-bottom:22px;
    border:1px solid var(--cyan);
    color:var(--cyan);
    text-align:center;
    border-radius:10px;
    font-weight:600;
}
.mobile-drawer-inner .drawer-cta:hover{
    background:rgba(33,230,193,.08);
    color:var(--cyan);
}

/* buttons */
.btn{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    min-height:48px;
    padding:0 28px;
    border-radius:12px;
    border:1px solid transparent;
    font-weight:700;
    font-size:1rem;
    cursor:pointer;
    line-height:1;
    transition:transform .2s ease,box-shadow .2s ease,background .2s ease,border-color .2s ease,color .2s ease;
}
.btn-primary{
    background:linear-gradient(135deg,#3E8BFF,#21E6C1);
    color:#06231F;
    box-shadow:0 0 0 1px rgba(62,139,255,.35),0 0 24px rgba(62,139,255,.22);
}
.btn-primary:hover{
    transform:translateY(-2px);
    box-shadow:0 0 0 1px rgba(33,230,193,.4),0 0 34px rgba(33,230,193,.3);
}
.btn-primary:active{
    transform:translateY(0);
}
.btn-secondary{
    background:rgba(255,255,255,.04);
    border-color:rgba(255,255,255,.22);
    color:var(--text);
}
.btn-secondary:hover{
    border-color:rgba(255,255,255,.6);
    color:var(--text);
    transform:translateX(2px);
}

/* article head area */
.article-head{
    position:relative;
    padding:clamp(56px,8vw,88px) 0 52px;
    border-bottom:1px solid var(--border);
    background:url('/assets/images/backpic/back-2.webp') center 30% / cover no-repeat;
}
.article-head::before{
    content:"";
    position:absolute;
    inset:0;
    background:linear-gradient(180deg,rgba(7,14,26,.72),rgba(8,16,30,.96) 80%);
    pointer-events:none;
}
.article-head-inner{
    position:relative;
    z-index:1;
    max-width:860px;
    margin-left:auto;
    margin-right:auto;
}
.breadcrumb{
    display:flex;
    align-items:center;
    flex-wrap:wrap;
    gap:8px;
    color:var(--text-muted);
    font-size:.88rem;
    margin-bottom:22px;
}
.breadcrumb a{
    color:var(--text-muted);
    transition:color .2s ease;
}
.breadcrumb a:hover{
    color:var(--cyan);
}
.breadcrumb .bc-sep{
    color:rgba(255,255,255,.26);
}
.breadcrumb [aria-current="page"]{
    color:var(--text-body);
}
.article-meta{
    display:flex;
    align-items:center;
    flex-wrap:wrap;
    gap:10px 14px;
    margin-bottom:18px;
}
.meta-chip{
    display:inline-flex;
    align-items:center;
    min-height:28px;
    padding:0 12px;
    background:rgba(33,230,193,.1);
    border:1px solid rgba(33,230,193,.25);
    color:var(--cyan);
    border-radius:var(--radius-sm);
    font-size:.84rem;
    letter-spacing:.02em;
}
.meta-date{
    color:var(--text-muted);
    font-size:.88rem;
}
.article-title{
    font-size:clamp(1.9rem,4vw,2.8rem);
    line-height:1.22;
    font-weight:800;
    letter-spacing:-.02em;
    max-width:820px;
}

/* article layout */
.article-wrap{
    padding:clamp(48px,7vw,72px) 0 clamp(56px,7vw,80px);
    background:linear-gradient(180deg,var(--bg),var(--bg-2));
}
.article-reader{
    max-width:860px;
    margin:0 auto;
}
.article-body{
    color:var(--text-body);
    font-size:clamp(1rem,1.6vw,1.125rem);
    line-height:1.9;
    text-align:justify;
    overflow-wrap:break-word;
}
.article-body > * + *{
    margin-top:1.05em;
}
.article-body h2,
.article-body h3,
.article-body h4{
    scroll-margin-top:90px;
}
.article-body h2{
    font-size:clamp(1.35rem,2.5vw,1.75rem);
    margin-top:1.8em;
    line-height:1.35;
}
.article-body h3{
    font-size:clamp(1.15rem,1.9vw,1.35rem);
    margin-top:1.5em;
    line-height:1.4;
}
.article-body h4{
    font-size:1.05rem;
    margin-top:1.2em;
    letter-spacing:.01em;
}
.article-body a{
    color:var(--cyan);
    text-decoration:underline;
    text-underline-offset:3px;
    text-decoration-color:rgba(33,230,193,.4);
    transition:text-decoration-color .2s ease,color .2s ease;
}
.article-body a:hover{
    color:var(--primary-light);
    text-decoration-color:var(--primary-light);
}
.article-body ul,
.article-body ol{
    padding-left:1.35em;
}
.article-body li{
    margin-top:.5em;
}
.article-body li::marker{
    color:var(--cyan);
}
.article-body blockquote{
    margin:1.6em 0;
    padding:18px 22px;
    border-left:3px solid var(--cyan);
    background:rgba(255,255,255,.03);
    border-radius:0 12px 12px 0;
    color:var(--text-body);
}
.article-body blockquote p{
    color:var(--text-body);
}
.article-body img{
    border-radius:16px;
    margin:1.6em 0;
    border:1px solid var(--border);
}
.article-body figure{
    margin:1.8em 0;
}
.article-body figcaption{
    color:var(--text-muted);
    font-size:.86rem;
    text-align:center;
    margin-top:8px;
}
.article-body table{
    width:100%;
    border-collapse:collapse;
    margin:1.6em 0;
    font-size:.96rem;
}
.article-body th,
.article-body td{
    border:1px solid var(--border);
    padding:10px 14px;
    text-align:left;
}
.article-body th{
    background:rgba(255,255,255,.05);
    color:var(--text);
    font-weight:700;
}
.article-body tr:nth-child(even) td{
    background:rgba(255,255,255,.018);
}
.article-body code{
    background:rgba(255,255,255,.08);
    color:var(--cyan);
    border-radius:6px;
    padding:.1em .45em;
    font-size:.9em;
}
.article-body pre{
    background:#060B14;
    border:1px solid var(--border);
    border-radius:14px;
    padding:18px;
    overflow-x:auto;
    line-height:1.6;
}
.article-body pre code{
    background:none;
    color:var(--text-body);
    padding:0;
}
.article-body hr{
    border:none;
    border-top:1px solid var(--border);
    margin:2.2em 0;
}

/* not found state */
.not-found{
    border:1px dashed var(--border-strong);
    border-radius:18px;
    background:rgba(255,255,255,.025);
    padding:56px 24px;
    text-align:center;
}
.not-found .not-found-icon{
    width:46px;
    height:46px;
    border-radius:50%;
    border:1px solid rgba(255,122,122,.4);
    color:var(--danger);
    display:flex;
    align-items:center;
    justify-content:center;
    font-size:1.4rem;
    margin:0 auto 18px;
}
.not-found h2{
    font-size:1.4rem;
    color:var(--text);
    margin-bottom:10px;
}
.not-found p{
    color:var(--text-muted);
    margin-bottom:24px;
}

/* relation section */
.relation-section{
    padding:clamp(48px,7vw,72px) 0;
    border-top:1px solid var(--border);
    background:var(--bg);
}
.section-label{
    display:inline-flex;
    align-items:center;
    gap:8px;
    color:var(--cyan);
    font-size:.82rem;
    font-weight:600;
    letter-spacing:.12em;
    text-transform:uppercase;
}
.section-label::before{
    content:"";
    width:6px;
    height:6px;
    border-radius:50%;
    background:var(--cyan);
    box-shadow:0 0 10px rgba(33,230,193,.6);
}
.section-title{
    font-size:clamp(1.45rem,2.6vw,2.1rem);
    margin-top:10px;
    margin-bottom:10px;
    letter-spacing:-.01em;
}
.section-lead{
    color:var(--text-muted);
    max-width:720px;
    font-size:1rem;
}
.relation-grid{
    display:grid;
    grid-template-columns:repeat(2,1fr);
    gap:18px;
    margin-top:34px;
}
.relation-card{
    display:grid;
    grid-template-columns:150px 1fr;
    align-items:center;
    gap:16px;
    background:rgba(255,255,255,.045);
    border:1px solid var(--border);
    border-radius:16px;
    padding:12px;
    transition:background .2s ease,border-color .2s ease,transform .2s ease;
}
.relation-card:hover{
    background:rgba(255,255,255,.07);
    border-color:rgba(33,230,193,.32);
    transform:translateY(-2px);
}
.relation-img{
    border-radius:12px;
    object-fit:cover;
    width:100%;
    height:104px;
    background:rgba(255,255,255,.04);
}
.relation-content .relation-tag{
    color:var(--cyan);
    font-size:.78rem;
    font-weight:600;
    letter-spacing:.04em;
}
.relation-content h3{
    font-size:1.02rem;
    margin-top:6px;
    line-height:1.45;
    color:var(--text);
    transition:color .2s ease;
}
.relation-card:hover .relation-content h3{
    color:var(--cyan);
}
.relation-content p{
    color:var(--text-muted);
    font-size:.86rem;
    line-height:1.6;
    margin-top:6px;
}
.relation-link{
    display:inline-flex;
    align-items:center;
    margin-top:10px;
    color:var(--text-body);
    font-size:.86rem;
    border-bottom:1px solid var(--border-strong);
    padding-bottom:1px;
    transition:color .2s ease,border-color .2s ease;
}
.relation-card:hover .relation-link{
    color:var(--text);
}
.relation-link:hover{
    color:var(--cyan) !important;
    border-color:var(--cyan);
}

/* aft section */
.cta-section{
    padding:clamp(52px,8vw,76px) 0;
    background:var(--bg-2);
}
.cta-panel{
    position:relative;
    max-width:960px;
    margin:0 auto;
    border:1px solid var(--border);
    border-radius:var(--radius-xl);
    background:
        linear-gradient(135deg,rgba(62,139,255,.14),rgba(33,230,193,.08)),
        url('/assets/images/backpic/back-1.png') center / cover no-repeat;
    padding:clamp(28px,5vw,52px);
    text-align:center;
    overflow:hidden;
}
.cta-panel::after{
    content:"";
    position:absolute;
    inset:0;
    background:linear-gradient(180deg,rgba(8,16,30,.25),rgba(8,16,30,.72));
    pointer-events:none;
}
.cta-panel > *{
    position:relative;
    z-index:1;
}
.cta-tag{
    display:inline-block;
    color:var(--cyan);
    font-size:.85rem;
    font-weight:700;
    letter-spacing:.06em;
}
.cta-title{
    font-size:clamp(1.4rem,2.6vw,2rem);
    color:var(--text);
    margin-top:12px;
    letter-spacing:-.01em;
}
.cta-desc{
    max-width:600px;
    margin:12px auto 24px;
    color:var(--text-muted);
}
.cta-action{
    display:flex;
    flex-wrap:wrap;
    justify-content:center;
    gap:14px;
}

/* footer */
.footer{
    background:var(--bg-deep);
    border-top:1px solid var(--border);
    padding:60px 0 32px;
}
.footer-top{
    display:grid;
    grid-template-columns:2fr 1fr 1fr 1.2fr;
    gap:42px;
    padding-bottom:42px;
    border-bottom:1px solid rgba(255,255,255,.06);
}
.footer-brand{
    color:var(--text);
    font-size:1.25rem;
    font-weight:800;
    letter-spacing:.01em;
}
.footer-desc{
    color:var(--text-muted);
    font-size:.92rem;
    max-width:420px;
    margin-top:14px;
    line-height:1.75;
}
.footer-support{
    display:flex;
    flex-direction:column;
    gap:8px;
    margin-top:18px;
}
.footer-support span{
    position:relative;
    padding-left:15px;
    color:var(--text-muted);
    font-size:.88rem;
}
.footer-support span::before{
    content:"";
    position:absolute;
    left:0;
    top:.55em;
    width:4px;
    height:4px;
    border-radius:50%;
    background:var(--cyan);
}
.footer-title{
    color:var(--text);
    font-size:.95rem;
    font-weight:700;
    margin-bottom:15px;
    letter-spacing:.04em;
}
.footer-links{
    list-style:none;
}
.footer-links li{
    margin-bottom:10px;
}
.footer-links a{
    color:var(--text-muted);
    font-size:.9rem;
    transition:color .2s ease,padding-left .2s ease;
}
.footer-links a:hover{
    color:var(--cyan);
    padding-left:4px;
}
.footer-bottom{
    display:flex;
    flex-wrap:wrap;
    justify-content:space-between;
    gap:10px;
    padding-top:24px;
    color:var(--text-weak);
    font-size:.84rem;
}
.footer-bottom p{
    margin:0;
}

/* responsive */
@media (max-width:1100px){
    .footer-top{
        grid-template-columns:1.4fr 1fr 1fr;
    }
    .footer-top > div:first-child{
        grid-column:1 / -1;
    }
}
@media (max-width:900px){
    .relation-grid{
        grid-template-columns:1fr;
    }
}
@media (max-width:767px){
    .main-nav,
    .header-login-desktop{
        display:none;
    }
    .menu-toggle{
        display:inline-flex;
    }
    .header-inner{
        min-height:64px;
    }
    .brand{
        font-size:.98rem;
    }
    .article-head{
        padding-top:48px;
    }
    .article-title{
        font-size:clamp(1.6rem,3.6vw,2rem);
    }
    .article-body{
        font-size:1rem;
    }
    .relation-card{
        grid-template-columns:118px 1fr;
    }
    .relation-img{
        height:92px;
    }
    .cta-action .btn{
        width:100%;
    }
    .footer-bottom{
        flex-direction:column;
    }
}
@media (max-width:560px){
    .footer-top{
        grid-template-columns:1fr;
        gap:28px;
    }
    .footer-support{
        margin-top:12px;
    }
    .relation-card{
        grid-template-columns:1fr;
    }
    .relation-img{
        width:100%;
        height:150px;
    }
    .relation-card .relation-img{
        display:block;
        width:100%;
    }
}
@media (prefers-reduced-motion:reduce){
    *{
        animation:none !important;
        transition:none !important;
        scroll-behavior:auto !important;
    }
}

/* roulang page: category1 */
:root {
  --bg-deep: #08101e;
  --bg-layer: #0b1525;
  --bg-foot: #060b14;
  --ink-title: #f3f7ff;
  --ink-body: #b7c4db;
  --ink-muted: #8494ab;
  --ink-faint: rgba(255, 255, 255, 0.42);
  --brand-blue: #3e8bff;
  --brand-blue-hi: #63a6ff;
  --brand-cyan: #21e6c1;
  --brand-amber: #f5b85a;
  --border-line: rgba(255, 255, 255, 0.1);
  --border-strong: rgba(255, 255, 255, 0.18);
  --glass: rgba(255, 255, 255, 0.055);
  --glass-strong: rgba(255, 255, 255, 0.09);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-card: 0 10px 30px rgba(3, 8, 18, 0.28);
  --shadow-glass: 0 18px 40px rgba(2, 6, 18, 0.38);
  --space-section: clamp(4.5rem, 8vw, 7rem);
  --header-height: 72px;
  --font-main: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
}
* {
  box-sizing: border-box;
}
html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-main);
  color: var(--ink-body);
  background:
    radial-gradient(900px 360px at 90% -120px, rgba(62, 139, 255, 0.1), transparent 60%),
    radial-gradient(780px 300px at 0% 10%, rgba(33, 230, 193, 0.04), transparent 55%),
    var(--bg-deep);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img {
  display: block;
  max-width: 100%;
}
a {
  color: inherit;
  text-decoration: none;
}
button,
input,
textarea {
  font: inherit;
  color: inherit;
}
button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--brand-cyan);
  outline-offset: 2px;
  border-radius: 4px;
}
.container {
  width: min(1200px, calc(100vw - 48px));
  margin-left: auto;
  margin-right: auto;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

/* ===== header ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(8, 16, 30, 0.76);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}
.header::before {
  content: "";
  display: block;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(33, 230, 193, 0.4), rgba(62, 139, 255, 0.4), transparent);
}
.header-inner {
  display: flex;
  min-height: var(--header-height);
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  color: var(--ink-title);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -0.02em;
  white-space: nowrap;
  line-height: 1.2;
}
.brand:hover {
  color: #fff;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}
.main-nav a {
  display: inline-block;
  position: relative;
  padding: 26px 14px 24px;
  font-size: 15px;
  color: var(--ink-muted);
  line-height: 1;
  transition: color 0.2s ease;
  letter-spacing: 0.02em;
}
.main-nav a:hover {
  color: #fff;
}
.main-nav a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 16px;
  width: 0;
  height: 2px;
  border-radius: 22px;
  transform: translateX(-50%);
  background: var(--brand-cyan);
  box-shadow: 0 0 8px rgba(33, 230, 193, 0.5);
  transition: width 0.2s ease;
}
.main-nav a:hover::after,
.main-nav a.active::after {
  width: 20px;
}
.main-nav a.active {
  color: #fff;
}
.header-login {
  font-size: 14px;
  color: var(--ink-title);
  border-bottom: 1px solid rgba(255, 255, 255, 0.45);
  padding-bottom: 3px;
  line-height: 1.2;
  transition: color 0.2s, border-color 0.2s;
}
.header-login:hover {
  color: var(--brand-cyan);
  border-color: var(--brand-cyan);
}
.menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  color: var(--ink-title);
  padding: 8px 18px;
  font-size: 14px;
  cursor: pointer;
  transition: background-color 0.2s;
}
.menu-toggle:hover {
  background: rgba(255, 255, 255, 0.08);
}
.mobile-drawer {
  display: none;
  background: rgba(7, 13, 23, 0.97);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}
.mobile-drawer.open {
  display: block;
}
.mobile-drawer-inner {
  display: grid;
  gap: 2px;
  padding: 14px 0 22px;
}
.mobile-drawer-inner a {
  display: block;
  color: var(--ink-body);
  padding: 13px 4px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 16px;
}
.mobile-drawer-inner a:hover {
  color: #fff;
}
.mobile-drawer-inner a.active {
  color: var(--brand-cyan);
}
.drawer-cta {
  margin-top: 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.28) !important;
  color: var(--ink-title) !important;
}

/* ===== hero ===== */
.page-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(2.6rem, 5vw, 4.6rem) 0 clamp(2.4rem, 5vw, 3.8rem);
  background:
    linear-gradient(120deg, rgba(8, 16, 30, 0.93), rgba(8, 16, 30, 0.78)),
    url("/assets/images/backpic/back-1.png") center / cover no-repeat,
    radial-gradient(700px 300px at 80% 0%, rgba(62, 139, 255, 0.1), transparent 60%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.page-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 80px;
  background: linear-gradient(to bottom, rgba(8, 16, 30, 0), rgba(8, 16, 30, 0.4));
  pointer-events: none;
}
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--ink-muted);
  margin-bottom: 22px;
}
.breadcrumb a {
  color: var(--ink-muted);
  transition: color 0.2s;
}
.breadcrumb a:hover {
  color: #fff;
}
.breadcrumb svg {
  width: 14px;
  height: 14px;
}
.page-tagline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--brand-cyan);
  border: 1px solid rgba(33, 230, 193, 0.32);
  background: rgba(33, 230, 193, 0.08);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 18px;
}
.page-hero h1 {
  margin: 0 0 18px;
  max-width: 990px;
  color: var(--ink-title);
  font-size: clamp(2rem, 4.4vw, 3.5rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 800;
}
.page-hero .lead {
  max-width: 880px;
  color: #c4d0e5;
  font-size: clamp(1rem, 1.6vw, 1.125rem);
  line-height: 1.9;
  margin: 0;
}

/* ===== section base ===== */
.section {
  position: relative;
  padding: var(--space-section) 0;
}
.section-sub {
  padding-top: calc(var(--space-section) * 0.6);
  padding-bottom: calc(var(--space-section) * 0.6);
}
.section-head {
  margin-bottom: clamp(2.2rem, 4vw, 3.2rem);
}
.eyebrow {
  display: inline-block;
  color: var(--brand-cyan);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-title {
  color: var(--ink-title);
  font-size: clamp(1.5rem, 3vw, 2.4rem);
  line-height: 1.25;
  font-weight: 800;
  margin: 0 0 14px;
  letter-spacing: -0.02em;
}
.section-desc {
  color: var(--ink-muted);
  max-width: 840px;
  font-size: 1rem;
  line-height: 1.85;
  margin: 0;
}
.section-desc + .section-desc {
  margin-top: 10px;
}

/* ===== intro asymmetrical ===== */
.asym-grid {
  display: grid;
  grid-template-columns: 1.65fr 1fr;
  gap: 22px;
  align-items: stretch;
}
.glass-panel {
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
  border: 1px solid var(--border-line);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-glass);
}
.panel-wide {
  border-top: 2px solid rgba(62, 139, 255, 0.35);
}
.panel-narrow {
  border-top: 2px solid rgba(33, 230, 193, 0.35);
}
.panel-label {
  font-size: 14px;
  color: var(--ink-muted);
  letter-spacing: 0.08em;
  font-weight: 600;
  margin-bottom: 16px;
}
.panel-title {
  font-size: clamp(1.15rem, 2.4vw, 1.6rem);
  color: var(--ink-title);
  margin: 0 0 16px;
  font-weight: 700;
  line-height: 1.35;
}
.check-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.check-list li {
  position: relative;
  padding-left: 28px;
  color: var(--ink-body);
  font-size: 1rem;
  line-height: 1.7;
}
.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 16px;
  height: 16px;
  border: 1px solid rgba(33, 230, 193, 0.55);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(33, 230, 193, 0.22) 0%, transparent 60%);
}
.notice-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 13px;
  border: 1px solid rgba(245, 184, 90, 0.36);
  color: var(--brand-amber);
  background: rgba(245, 184, 90, 0.07);
  margin-bottom: 18px;
}
.data-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.data-list li {
  border-left: 1px solid rgba(255, 255, 255, 0.18);
  padding-left: 14px;
  color: var(--ink-body);
}
.data-list strong {
  display: block;
  color: var(--ink-title);
  font-weight: 700;
  font-size: 15px;
}
.data-list span {
  font-size: 14px;
  color: var(--ink-muted);
}

/* ===== step area ===== */
.split-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 42px;
  align-items: center;
}
.step-list {
  display: grid;
  gap: 22px;
  counter-reset: step;
}
.step-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 18px;
  padding: 22px 24px;
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: var(--radius-md);
  transition: border-color 0.2s, background 0.2s, transform 0.2s;
}
.step-card:hover {
  border-color: rgba(33, 230, 193, 0.3);
  background: rgba(255, 255, 255, 0.065);
  transform: translateY(-2px);
}
.step-no {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #06231f;
  font-weight: 800;
  font-size: 16px;
  background: linear-gradient(135deg, var(--brand-blue), var(--brand-cyan));
  box-shadow: 0 0 0 4px rgba(33, 230, 193, 0.1);
}
.step-content h3 {
  margin: 0 0 8px;
  color: var(--ink-title);
  font-size: 1.12rem;
  font-weight: 700;
}
.step-content p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--ink-muted);
  line-height: 1.65;
}
.request-list {
  margin-top: 12px;
  display: grid;
  gap: 8px;
}
.request-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  color: var(--ink-muted);
  list-style: none;
}
.request-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--brand-cyan);
  opacity: 0.7;
}
.browser-card {
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-lg);
  padding: 18px;
  box-shadow: var(--shadow-card);
}
.browser-card-time {
  color: var(--ink-faint);
  font-size: 13px;
  margin-bottom: 14px;
}
.browser-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.07);
  border-radius: 12px 12px 0 0;
}
.browser-dots {
  display: flex;
  gap: 5px;
}
.browser-dots i {
  width: 8px;
  height: 8px;
  display: block;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
}
.browser-top .browser-url {
  flex: 1;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  padding: 8px 16px;
  font-size: 13px;
  color: #b6c4d9;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.mock-login-panel {
  border-radius: 0 0 12px 12px;
  background: rgba(8, 16, 30, 0.55);
  padding: 22px 18px 24px;
  display: grid;
  gap: 14px;
}
.mock-userbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: 14px;
}
.mock-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: linear-gradient(135deg, #3e8bff, #21e6c1);
}
.mock-tabs {
  display: flex;
  gap: 8px;
}
.mock-field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.mock-input {
  height: 40px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.55);
  font-size: 12px;
}
.mock-submit {
  height: 44px;
  border-radius: 999px;
  background: linear-gradient(135deg, #3e8bff, #21e6c1);
  color: #06231f;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  margin-top: 4px;
}
.mock-note {
  text-align: center;
  color: rgba(255, 255, 255, 0.42);
  font-size: 12px;
}
.policy-hint {
  font-size: 13px;
  display: flex;
  gap: 8px;
  align-items: center;
  color: var(--ink-muted);
  background: rgba(33, 230, 193, 0.08);
  border: 1px solid rgba(33, 230, 193, 0.22);
  border-radius: 12px;
  padding: 12px 14px;
  margin-top: 12px;
}

/* ===== table ===== */
.table-panel {
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.035));
  border: 1px solid var(--border-line);
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: var(--shadow-glass);
}
.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.page-table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
  text-align: left;
}
.page-table caption {
  text-align: left;
  font-size: 14px;
  color: var(--ink-faint);
  padding-bottom: 12px;
}
.page-table th {
  background: rgba(255, 255, 255, 0.055);
  color: var(--ink-title);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.04em;
  padding: 15px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.page-table td {
  padding: 16px;
  color: var(--ink-body);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  vertical-align: top;
  font-size: 14px;
  line-height: 1.7;
}
.page-table td:first-child {
  color: var(--ink-title);
  font-weight: 700;
  font-size: 14px;
  width: 120px;
}
.page-table .cell-title {
  color: var(--ink-body);
  font-weight: 700;
}
.page-table td strong {
  color: var(--ink-title);
}
.table-info {
  margin-top: 16px;
  padding: 14px 18px;
  border-left: 3px solid var(--brand-cyan);
  background: rgba(33, 230, 193, 0.08);
  border-radius: 0 12px 12px 0;
  font-size: 14px;
  color: #c7cfdc;
  line-height: 1.7;
}
.additional-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 26px;
}
.additional-item {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: var(--radius-md);
  padding: 20px 20px 18px;
}
.additional-item h3 {
  color: var(--ink-title);
  font-size: 1rem;
  margin: 0 0 10px;
  font-weight: 700;
}
.additional-item p {
  margin: 0;
  font-size: 14px;
  color: var(--ink-muted);
  line-height: 1.7;
}

/* ===== CTA double ===== */
.double-cta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.cta-panel {
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.085), rgba(255, 255, 255, 0.035)),
    url("/assets/images/backpic/back-3.png") center / cover no-repeat;
  background-blend-mode: overlay;
  border: 1px solid var(--border-line);
  border-radius: var(--radius-lg);
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 240px;
  box-shadow: var(--shadow-card);
  transition: border-color 0.2s, transform 0.2s;
}
.cta-panel:hover {
  border-color: rgba(62, 139, 255, 0.4);
  transform: translateY(-3px);
}
.cta-panel.cyan-panel:hover {
  border-color: rgba(33, 230, 193, 0.4);
}
.cta-panel h3 {
  margin: 0 0 12px;
  color: var(--ink-title);
  font-size: 1.3rem;
  font-weight: 800;
}
.cta-panel p {
  margin: 0 0 22px;
  color: var(--ink-muted);
  font-size: 14px;
  line-height: 1.7;
  max-width: 380px;
}
.mini-note {
  color: var(--ink-faint);
  font-size: 13px;
}
.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-top: 8px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 10px 24px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 800;
  border: 1px solid transparent;
  cursor: pointer;
  transition: box-shadow 0.22s ease, transform 0.22s ease, background-color 0.22s ease, border-color 0.22s;
}
.btn-primary {
  background: linear-gradient(135deg, #3e8bff, #21e6c1);
  color: #06231f;
  box-shadow: 0 0 0 1px rgba(62, 139, 255, 0.32), 0 0 24px rgba(62, 139, 255, 0.2);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 0 1px rgba(33, 230, 193, 0.45), 0 0 32px rgba(33, 230, 193, 0.28);
}
.btn-primary:active {
  transform: translateY(0);
}
.btn-ghost {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.28);
  background: transparent;
}
.btn-ghost:hover {
  border-color: var(--brand-cyan);
  color: var(--brand-cyan);
  transform: translateX(3px);
}
.link-line {
  color: var(--ink-body);
  text-decoration: underline;
  text-underline-offset: 4px;
  font-size: 14px;
  transition: color 0.2s;
}
.link-line:hover {
  color: var(--brand-cyan);
}

/* ===== FAQ ===== */
.faq-wrap {
  max-width: 860px;
  margin: 0 auto;
  padding: 0;
}
.faq-row {
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.faq-row summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 6px;
  transition: background-color 0.2s, padding 0.2s;
}
.faq-row summary::-webkit-details-marker {
  display: none;
}
.faq-row summary h3 {
  font-size: 1.02rem;
  color: var(--ink-title);
  font-weight: 700;
  margin: 0;
  line-height: 1.55;
}
.faq-row summary .faq-icon {
  position: relative;
  width: 20px;
  height: 20px;
  flex: 0 0 20px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
}
.faq-row summary .faq-icon::before,
.faq-row summary .faq-icon::after {
  content: "";
  position: absolute;
  background: rgba(255, 255, 255, 0.7);
  border-radius: 2px;
}
.faq-row summary .faq-icon::before {
  left: 9px;
  top: 5px;
  width: 1.5px;
  height: 9px;
}
.faq-row summary .faq-icon::after {
  left: 5px;
  top: 9px;
  height: 1.5px;
  width: 9px;
  background: rgba(33, 230, 193, 0.9);
}
.faq-row[open] summary .faq-icon::after {
  background: transparent;
}
.faq-row[open] summary {
  background: rgba(255, 255, 255, 0.035);
}
.faq-answer {
  padding: 0 22px 22px 6px;
  color: var(--ink-muted);
  font-size: 15px;
  line-height: 1.8;
}
.faq-answer p {
  margin: 0 0 10px;
}
.faq-answer p:last-child {
  margin-bottom: 0;
}

/* ===== footer ===== */
.footer {
  background: var(--bg-foot);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 54px;
}
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 34px;
  padding-bottom: 38px;
}
.footer-brand {
  display: inline-block;
  color: var(--ink-title);
  font-size: 18px;
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}
.footer-desc {
  max-width: 420px;
  font-size: 14px;
  color: var(--ink-muted);
  line-height: 1.75;
  margin: 0 0 18px;
}
.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.footer-links a {
  color: var(--ink-muted);
  font-size: 14px;
  line-height: 1.6;
  transition: color 0.2s;
}
.footer-links a:hover {
  color: var(--brand-cyan);
}
.footer-title {
  color: var(--ink-title);
  font-size: 15px;
  font-weight: 700;
  margin: 0 0 14px;
}
.footer-support {
  display: grid;
  gap: 8px;
}
.footer-support span {
  font-size: 13px;
  color: var(--ink-faint);
  padding-left: 14px;
  position: relative;
}
.footer-support span::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--brand-cyan);
  left: 0;
  top: 9px;
  position: absolute;
}
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  padding: 22px 0 26px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
}
.footer-bottom p {
  margin: 0;
  color: var(--ink-faint);
  font-size: 13px;
}

/* ===== media queries ===== */
@media (max-width: 1024px) {
  .main-nav,
  .header-login-desktop {
    display: none;
  }
  .menu-toggle {
    display: inline-flex;
  }
  .asym-grid {
    grid-template-columns: 1fr;
  }
  .split-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
  .double-cta,
  .additional-grid {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 768px) {
  .container {
    width: min(100% - 32px, 1200px);
  }
  .brand {
    font-size: 15px;
    max-width: 180px;
  }
  .page-hero {
    padding-top: 2.4rem;
  }
  .page-hero h1 {
    font-size: 2rem;
  }
  .glass-panel {
    padding: 22px;
  }
  .table-panel {
    padding: 16px;
  }
  .browser-card {
    padding: 12px;
  }
}
@media (max-width: 520px) {
  .container {
    width: min(100% - 24px, 1200px);
  }
  .brand {
    max-width: 150px;
    font-size: 14px;
    white-space: normal;
    line-height: 1.3;
  }
  .menu-toggle {
    padding: 8px 14px;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 26px;
  }
  .step-card {
    grid-template-columns: 1fr;
  }
  .step-no {
    width: 36px;
    height: 36px;
  }
  .mock-field-row {
    grid-template-columns: 1fr;
  }
}

/* roulang page: category3 */
:root {
  --bg: #08101E;
  --bg-soft: #0B1525;
  --bg-deep: #060B14;
  --blue: #3E8BFF;
  --blue-light: #63A6FF;
  --teal: #21E6C1;
  --amber: #F5B85A;
  --heading: #F3F7FF;
  --body: #B7C4DB;
  --muted: #8494AB;
  --weak: rgba(255,255,255,0.42);
  --line: rgba(255,255,255,0.10);
  --glass: rgba(255,255,255,0.055);
  --glass-soft: rgba(255,255,255,0.035);
  --glass-highlight: rgba(255,255,255,0.14);
  --radius-small: 6px;
  --radius-card: 12px;
  --radius-panel: 16px;
  --radius-hero: 24px;
  --shadow-card: 0 10px 30px rgba(3, 8, 18, 0.28);
  --shadow-panel: 0 18px 40px rgba(2, 6, 18, 0.38);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --max-width: 1200px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--body);
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

button,
input,
textarea,
select {
  font: inherit;
}

h1,
h2,
h3 {
  margin: 0;
  color: var(--heading);
  line-height: 1.25;
  letter-spacing: -0.02em;
  font-weight: 800;
}

p {
  margin: 0;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

.container {
  width: min(var(--max-width), 100% - 48px);
  margin-inline: auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.65rem 1.6rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: transform 0.2s ease, box-shadow 0.25s ease, background-color 0.25s ease, border-color 0.25s ease, color 0.25s ease;
  cursor: pointer;
  text-align: center;
  line-height: 1.4;
}

.btn-primary {
  background: linear-gradient(135deg, rgba(48, 124, 255, 0.95), rgba(45, 230, 201, 0.92));
  color: #06231F;
  box-shadow: 0 0 0 1px rgba(62,139,255,0.28), 0 10px 30px rgba(3,8,18,0.25), 0 0 24px rgba(62,139,255,0.18);
}

.btn-primary:hover {
  box-shadow: 0 0 0 1px rgba(33,230,193,0.55), 0 14px 34px rgba(3,8,18,0.28), 0 0 34px rgba(33,230,193,0.28);
  transform: translateY(-2px);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: transparent;
  border-color: rgba(255,255,255,0.28);
  color: #F3F7FF;
}

.btn-secondary:hover {
  border-color: rgba(255,255,255,0.72);
  color: #ffffff;
  transform: translateX(2px);
  background: rgba(255,255,255,0.04);
}

.text-link {
  color: var(--body);
  border-bottom: 1px solid rgba(183,196,219,0.45);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.text-link:hover {
  color: var(--teal);
  border-color: var(--teal);
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(8, 16, 30, 0.84);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  color: #ffffff;
  font-size: 1.08rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  white-space: nowrap;
  line-height: 1.35;
}

.main-nav {
  display: none;
}

.header-login {
  display: none;
  font-size: 0.95rem;
  font-weight: 500;
  color: #E6ECFA;
  border-bottom: 1px solid rgba(255,255,255,0.45);
  line-height: 1.7;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.header-login:hover {
  color: #ffffff;
  border-color: var(--teal);
}

.menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  background: transparent;
  border: 0;
  color: #ffffff;
  font-size: 1rem;
  padding: 8px 0 8px 8px;
  cursor: pointer;
  line-height: 1;
  border-bottom: 1px solid transparent;
}

.mobile-drawer {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  width: 100%;
  max-height: calc(100vh - 72px);
  overflow-y: auto;
  background: rgba(6, 11, 20, 0.97);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line);
  padding: 12px 0 26px;
  z-index: 90;
}

.mobile-drawer.open {
  display: block;
}

.mobile-drawer-inner {
  display: flex;
  flex-direction: column;
}

.mobile-drawer-inner a {
  display: block;
  padding: 12px 0;
  font-size: 1rem;
  color: rgba(243,247,255,0.86);
  border-bottom: 1px solid rgba(255,255,255,0.07);
}

.mobile-drawer-inner a:last-child {
  border-bottom: 0;
}

.mobile-drawer-inner a.active {
  color: var(--teal);
}

.mobile-drawer-inner .drawer-cta {
  margin-top: 16px;
  text-align: center;
  background: rgba(33,230,193,0.10);
  border: 1px solid rgba(33,230,193,0.28);
  border-radius: 12px;
  color: #ffffff;
  font-weight: 600;
}

.mobile-drawer .container {
  padding: 0 24px;
}

@media (min-width: 901px) {
  .main-nav {
    display: flex;
    align-items: center;
    gap: 2rem;
  }

  .main-nav a {
    position: relative;
    color: rgba(183,196,219,0.92);
    font-size: 0.98rem;
    letter-spacing: 0.02em;
    padding: 6px 1px;
    transition: color 0.2s ease;
  }

  .main-nav a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -5px;
    height: 2px;
    width: 100%;
    border-radius: 999px;
    background: var(--teal);
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform 0.2s ease;
  }

  .main-nav a:hover {
    color: #ffffff;
  }

  .main-nav a:hover::after {
    transform: scaleX(1);
  }

  .main-nav a.active {
    color: #ffffff;
  }

  .main-nav a.active::after {
    transform: scaleX(1);
    background: var(--teal);
    box-shadow: 0 0 10px rgba(33,230,193,0.65);
  }

  .header-login-desktop {
    display: inline-block;
  }

  .menu-toggle {
    display: none;
  }

  .mobile-drawer {
    display: none !important;
  }
}

@media (min-width: 1024px) {
  .main-nav {
    gap: 2.35rem;
  }
}

/* Page hero */
.page-hero {
  position: relative;
  background:
    linear-gradient(135deg, rgba(8,16,30,0.93), rgba(8,16,30,0.72)),
    url('/assets/images/backpic/back-2.webp') center / cover no-repeat;
  padding: clamp(4.2rem, 8vw, 6.4rem) 0 clamp(2.6rem, 4vw, 3.4rem);
  border-bottom: 1px solid rgba(255,255,255,0.07);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
  font-size: 0.875rem;
  color: var(--muted);
  margin-bottom: 1.4rem;
}

.breadcrumb a {
  color: var(--muted);
  transition: color 0.2s ease;
}

.breadcrumb a:hover {
  color: #ffffff;
}

.breadcrumb span[aria-current="page"] {
  color: rgba(243,247,255,0.72);
}

.page-hero h1 {
  font-size: clamp(2.05rem, 4.6vw, 3.55rem);
  max-width: 950px;
  line-height: 1.18;
}

.page-hero-intro {
  margin-top: 1.2rem;
  max-width: 720px;
  font-size: clamp(1rem, 1.6vw, 1.12rem);
  color: #C8D2E6;
  line-height: 1.85;
}

/* Section */
.section {
  padding: clamp(4rem, 7vw, 6.6rem) 0;
}

.section-alt {
  background: var(--bg-soft);
  border-top: 1px solid rgba(255,255,255,0.05);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.section-head {
  margin-bottom: clamp(2.2rem, 4vw, 3.2rem);
  max-width: 760px;
}

.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--teal);
  background: rgba(33,230,193,0.10);
  border: 1px solid rgba(33,230,193,0.20);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 0.9rem;
}

.section-title {
  font-size: clamp(1.55rem, 3vw, 2.4rem);
}

.section-lead {
  margin-top: 0.8rem;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.8;
}

/* Safety alert */
.safety-alert-section {
  padding: clamp(1.9rem, 3vw, 2.8rem) 0 0;
}

.safety-alert {
  position: relative;
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding: 24px 26px;
  border-radius: var(--radius-panel);
  background: rgba(11, 21, 37, 0.72);
  border: 1px solid rgba(33,230,193,0.18);
  box-shadow: 0 10px 28px rgba(3,8,18,0.22);
}

.safety-alert::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 24px;
  bottom: 24px;
  width: 3px;
  border-radius: 0 4px 4px 0;
  background: var(--teal);
  box-shadow: 0 0 14px rgba(33,230,193,0.50);
}

.safety-alert-icon {
  flex: 0 0 auto;
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: rgba(33,230,193,0.08);
  border: 1px solid rgba(33,230,193,0.22);
  color: var(--teal);
}

.safety-alert-body strong {
  display: block;
  color: var(--heading);
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.safety-alert-body p {
  color: var(--body);
  font-size: 0.95rem;
  max-width: 870px;
}

.safety-alert-body a {
  color: #ffffff;
  border-bottom: 1px solid var(--teal);
}

.safety-alert-body a:hover {
  color: var(--teal);
}

/* Security mechanism */
.mechanism-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: clamp(2rem, 5vw, 4.4rem);
  align-items: center;
}

.mechanism-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.mechanism-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 8px 18px;
  padding: 22px 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.mechanism-item:first-child {
  padding-top: 0;
}

.mechanism-item:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.mechanism-num {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--teal);
  letter-spacing: 0.06em;
  line-height: 1.3;
}

.mechanism-item h3 {
  font-size: 1.05rem;
  color: #F3F7FF;
}

.mechanism-item p {
  margin-top: 5px;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.75;
}

.media-frame {
  position: relative;
  border-radius: var(--radius-hero);
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.13);
  background: linear-gradient(145deg, rgba(62,139,255,0.10), rgba(33,230,193,0.06)), #0B1525;
  box-shadow: 0 22px 45px rgba(2,6,18,0.35);
}

.media-frame img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.media-frame::after {
  content: "示意图";
  position: absolute;
  left: 14px;
  bottom: 14px;
  font-size: 0.75rem;
  color: rgba(255,255,255,0.82);
  background: rgba(6,11,20,0.70);
  border: 1px solid rgba(255,255,255,0.15);
  padding: 4px 10px;
  border-radius: 999px;
  backdrop-filter: blur(8px);
}

/* FAQ */
.faq-wrap {
  max-width: 860px;
}

.faq-group-title {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.02rem;
  color: var(--teal);
  font-weight: 700;
  margin-bottom: 14px;
}

.faq-group-title::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--teal);
  border-radius: 2px;
}

.faq-group + .faq-group {
  margin-top: 38px;
}

.faq-item {
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.faq-item:first-of-type {
  border-top: 1px solid rgba(255,255,255,0.08);
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  width: 100%;
  background: transparent;
  border: 0;
  text-align: left;
  color: #E8EDF8;
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.6;
  padding: 15px 4px;
  cursor: pointer;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.faq-question:hover {
  color: #ffffff;
}

.faq-question[aria-expanded="true"] {
  color: var(--teal);
}

.faq-icon {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  font-size: 1.2rem;
  font-style: normal;
  font-weight: 300;
  color: rgba(255,255,255,0.55);
  transition: transform 0.2s ease, color 0.2s ease;
}

.faq-question[aria-expanded="true"] .faq-icon {
  color: var(--teal);
  transform: rotate(45deg);
}

.faq-answer {
  display: none;
  padding: 0 38px 18px 4px;
}

.faq-answer.show {
  display: block;
}

.faq-answer p {
  color: #A9B7CF;
  font-size: 0.96rem;
  line-height: 1.85;
  background: rgba(255,255,255,0.03);
  border-left: 2px solid rgba(33,230,193,0.40);
  border-radius: 0 8px 8px 0;
  padding: 12px 14px 12px 18px;
}

/* Contact section */
.contact-section {
  background: var(--bg-soft);
}

.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(1.6rem, 4vw, 3.2rem);
  align-items: stretch;
}

.contact-note,
.contact-aside {
  background: rgba(255,255,255,0.045);
  border: 1px solid rgba(255,255,255,0.09);
  border-radius: var(--radius-panel);
  padding: clamp(1.4rem, 3vw, 2.4rem);
  box-shadow: var(--shadow-card);
}

.contact-note h2,
.contact-aside h3 {
  font-size: 1.2rem;
  color: #ffffff;
  margin-bottom: 12px;
}

.contact-note > p,
.contact-aside p {
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.8;
}

.contact-list {
  margin-top: 18px;
  display: grid;
  gap: 10px;
}

.contact-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 0.92rem;
  color: #B7C4DB;
}

.contact-list li::before {
  content: "";
  flex: 0 0 auto;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--teal);
  margin-top: 12px;
}

.contact-tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 18px 0 22px;
}

.contact-tag {
  display: inline-flex;
  align-items: center;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.12);
  color: #DCE4F2;
  font-size: 0.82rem;
  border-radius: 999px;
  padding: 4px 11px;
  gap: 6px;
}

.contact-tag::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--amber);
}

/* Bottom CTA */
.cta-section {
  padding: clamp(4rem, 7vw, 6.5rem) 0;
}

.cta-box {
  position: relative;
  text-align: center;
  padding: clamp(2.4rem, 5vw, 4.2rem) clamp(1.3rem, 5vw, 4rem);
  border-radius: var(--radius-hero);
  background:
    linear-gradient(135deg, rgba(6, 16, 30, 0.92), rgba(11, 21, 37, 0.78)),
    url('/assets/images/backpic/back-1.png') center / cover no-repeat;
  border: 1px solid rgba(255,255,255,0.12);
  box-shadow: 0 18px 40px rgba(2,6,18,0.35);
}

.cta-kicker {
  display: inline-block;
  font-size: 0.84rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--teal);
  border: 1px solid rgba(33,230,193,0.26);
  background: rgba(33,230,193,0.08);
  padding: 5px 14px;
  border-radius: 999px;
  margin-bottom: 1rem;
}

.cta-box h2 {
  font-size: clamp(1.5rem, 3vw, 2.35rem);
  max-width: 830px;
  margin-inline: auto;
}

.cta-box p {
  max-width: 660px;
  margin: 0.9rem auto 1.8rem;
  color: #B7C4DB;
  font-size: 1rem;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}

/* Footer */
.footer {
  background: var(--bg-deep);
  border-top: 1px solid rgba(255,255,255,0.07);
  padding: clamp(3rem, 6vw, 4.6rem) 0 1.6rem;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.9fr) minmax(0, 0.9fr) minmax(0, 1fr);
  gap: 2rem 3rem;
  padding-bottom: 2.4rem;
}

.footer-brand {
  display: inline-block;
  color: #ffffff;
  font-size: 1.12rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-bottom: 12px;
}

.footer-desc {
  color: var(--muted);
  font-size: 0.92rem;
  max-width: 350px;
  margin-bottom: 16px;
  line-height: 1.75;
}

.footer-support {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  font-size: 0.82rem;
  color: rgba(132,148,171,0.88);
}

.footer-support span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,0.035);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 999px;
  padding: 4px 10px;
  line-height: 1.5;
}

.footer-support span::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: rgba(33,230,193,0.74);
}

.footer-title {
  font-size: 0.95rem;
  color: #E5EBF7;
  margin-bottom: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.footer-links {
  display: grid;
  gap: 0.35rem;
}

.footer-links a {
  display: inline-block;
  color: var(--muted);
  font-size: 0.9rem;
  padding: 3px 0;
  transition: color 0.2s ease, transform 0.2s ease;
}

.footer-links a:hover {
  color: #ffffff;
  transform: translateX(3px);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.07);
  padding-top: 1.4rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 20px;
  margin-top: 1px;
}

.footer-bottom p {
  color: rgba(132, 148, 171, 0.72);
  font-size: 0.82rem;
  margin: 0;
}

/* Responsive */
@media (max-width: 1023px) {
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 767px) {
  .container {
    width: min(100% - 32px, 1200px);
  }

  .brand {
    font-size: 0.98rem;
  }

  .page-hero {
    padding-top: 3.2rem;
  }

  .breadcrumb {
    font-size: 0.78rem;
  }

  .safety-alert {
    flex-direction: column;
    gap: 14px;
    padding: 20px 18px;
  }

  .safety-alert-icon {
    width: 36px;
    height: 36px;
  }

  .mechanism-grid {
    grid-template-columns: 1fr;
    gap: 2.2rem;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-desc {
    max-width: none;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .cta-box {
    padding: 2rem 1.2rem;
  }

  .cta-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .cta-actions .btn {
    width: 100%;
  }

  .faq-answer {
    padding-right: 4px;
  }
}

@media (max-width: 520px) {
  .container {
    width: min(100% - 24px, 1200px);
  }

  .header-inner {
    height: 64px;
  }

  .mobile-drawer {
    top: 64px;
    max-height: calc(100vh - 64px);
  }

  .page-hero h1 {
    font-size: 2rem;
  }

  .page-hero-intro {
    font-size: 0.95rem;
  }

  .mechanism-item {
    grid-template-columns: 48px 1fr;
  }

  .mechanism-num {
    font-size: 1rem;
  }

  .footer-brand {
    font-size: 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* roulang page: category2 */
:root{
  --bg-deep:#060b14;
  --bg-body:#08101e;
  --bg-section:#0b1525;
  --glass:rgba(255,255,255,.055);
  --glass-light:rgba(255,255,255,.085);
  --border:rgba(255,255,255,.10);
  --border-bright:rgba(255,255,255,.18);
  --text:#f3f7ff;
  --body:#b7c4db;
  --muted:#8494ab;
  --weak:rgba(255,255,255,.44);
  --primary:#3e8bff;
  --primary-bright:#63a6ff;
  --accent:#21e6c1;
  --warm:#f5b85a;
  --danger:#ff7a7a;
  --radius-xs:6px;
  --radius-sm:10px;
  --radius-card:12px;
  --radius-glass:16px;
  --radius-big:24px;
  --shadow-card:0 10px 30px rgba(3,8,18,.28);
  --shadow-glass:0 18px 40px rgba(2,6,18,.38);
  --shadow-primary:0 0 0 1px rgba(62,139,255,.35),0 0 24px rgba(62,139,255,.25);
  --font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue","PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
}
html{scroll-behavior:smooth}
*{box-sizing:border-box;margin:0;padding:0}
body{
  font-family:var(--font);
  background:var(--bg-body);
  color:var(--body);
  line-height:1.75;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
li{list-style:none}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button{font:inherit;background:none;border:0;color:inherit;cursor:pointer}
h1,h2,h3,h4{color:var(--text);font-weight:800;line-height:1.3}
.container{max-width:1200px;margin:0 auto;padding-left:24px;padding-right:24px}
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible,textarea:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:3px;
  border-radius:4px;
}
::selection{background:rgba(62,139,255,.32);color:#fff}
:focus:not(:focus-visible){outline:none}

/* header */
.header{
  position:sticky;
  top:0;
  z-index:120;
  background:rgba(8,16,30,.78);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  border-bottom:1px solid rgba(255,255,255,.08);
}
.header-inner{
  min-height:72px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:26px;
}
.brand{
  color:#fff;
  font-size:1.08rem;
  font-weight:800;
  letter-spacing:.01em;
  white-space:nowrap;
}
.brand small{display:block;font-size:.68rem;font-weight:500;color:var(--muted);letter-spacing:.08em}
.main-nav{
  display:flex;
  align-items:center;
  gap:30px;
  margin-left:auto;
}
.main-nav a{
  position:relative;
  color:var(--muted);
  font-size:.95rem;
  padding:8px 2px;
  letter-spacing:.02em;
  white-space:nowrap;
  transition:color .22s ease;
}
.main-nav a:hover{color:#fff}
.main-nav a::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:-2px;
  height:4px;
  border-radius:99px;
  background:var(--accent);
  opacity:0;
  transform:scaleX(.3);
  transition:opacity .2s,transform .2s;
}
.main-nav a:hover::after{
  opacity:.85;
  transform:scaleX(.72);
}
.main-nav a.active{color:#fff}
.main-nav a.active::after{
  opacity:.95;
  transform:scaleX(1);
}
.header-login-desktop{
  color:#d8e5f6 !important;
  font-size:.9rem;
  padding:8px 2px;
  border-bottom:1px solid rgba(255,255,255,.42);
  white-space:nowrap;
  transition:color .22s,border-color .22s;
}
.header-login-desktop:hover{
  color:#fff !important;
  border-color:var(--accent);
}
.menu-toggle{display:none;color:var(--body);font-size:.95rem;padding:7px 14px;border:1px solid rgba(255,255,255,.14);border-radius:9px;transition:all .2s}
.menu-toggle:hover{color:#fff;border-color:rgba(255,255,255,.3)}
.mobile-drawer{
  display:none;
  background:rgba(8,16,30,.97);
  border-top:1px solid rgba(255,255,255,.06);
}
.mobile-drawer.is-open{display:block}
.mobile-drawer-inner{
  display:grid;
  gap:4px;
  padding:12px 22px 20px;
}
.mobile-drawer a{
  display:block;
  color:var(--body);
  font-size:1rem;
  padding:12px 4px;
  border-bottom:1px solid rgba(255,255,255,.05);
  transition:color .2s;
}
.mobile-drawer a:hover{color:#fff}
.mobile-drawer a.active{color:var(--accent)}
.mobile-drawer .drawer-cta{
  margin-top:14px;
  text-align:center;
  color:#08101e;
  font-weight:700;
  background:linear-gradient(135deg,#62d9c0,#21e6c1);
  border:0;
  border-radius:10px;
  padding:12px 14px;
}

/* buttons */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  min-height:48px;
  padding:0 26px;
  border-radius:999px;
  font-weight:700;
  font-size:.95rem;
  border:1px solid transparent;
  transition:all .24s ease;
  cursor:pointer;
  text-align:center;
}
.btn-primary{
  background:linear-gradient(135deg,#3e8bff 10%,#21e6c1 130%);
  color:#06231f;
  box-shadow:0 0 0 1px rgba(62,139,255,.3),0 12px 26px rgba(33,230,193,.12);
}
.btn-primary:hover{
  color:#06231f;
  transform:translateY(-2px);
  box-shadow:0 0 0 1px rgba(33,230,193,.5),0 14px 34px rgba(33,230,193,.28);
}
.btn-ghost{
  background:transparent;
  color:#fff;
  border-color:rgba(255,255,255,.25);
}
.btn-ghost:hover{
  border-color:rgba(255,255,255,.64);
  transform:translateX(3px);
}

/* banner */
.page-banner{
  position:relative;
  padding:clamp(74px,11vw,124px) 0 clamp(44px,6vw,70px);
  border-bottom:1px solid rgba(255,255,255,.07);
  background:
    linear-gradient(135deg,rgba(8,16,30,.96) 18%,rgba(11,21,37,.76) 48%,rgba(8,16,30,.93) 90%),
    url('/assets/images/backpic/back-3.png') center center/cover no-repeat;
}
.banner-inner{position:relative;z-index:2}
.banner-eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin-bottom:18px;
  padding:7px 14px;
  border:1px solid rgba(255,255,255,.16);
  border-radius:999px;
  color:var(--accent);
  font-size:.8rem;
  letter-spacing:.08em;
  background:rgba(8,16,30,.3);
}
.page-banner h1{
  max-width:920px;
  font-size:clamp(2.05rem,4.4vw,3.45rem);
  line-height:1.16;
  letter-spacing:-.02em;
}
.banner-lead{
  max-width:800px;
  margin-top:22px;
  color:var(--body);
  font-size:clamp(1rem,1.6vw,1.13rem);
  line-height:1.85;
}
.banner-meta{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:22px;
  margin-top:34px;
  color:var(--muted);
  font-size:.9rem;
}
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:9px;
  font-size:.88rem;
  color:var(--weak);
  margin-top:30px;
}
.breadcrumb a{color:#a9bad4;transition:color .2s}
.breadcrumb a:hover{color:var(--accent)}
.breadcrumb i{font-style:normal;color:rgba(255,255,255,.24)}
.breadcrumb span{color:var(--muted)}

/* section */
.section{padding:clamp(4.2rem,7vw,6.6rem) 0}
.section-head{
  max-width:920px;
  margin-bottom:clamp(32px,5vw,54px);
}
.section-label{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-size:.82rem;
  font-weight:700;
  letter-spacing:.2em;
  color:var(--accent);
  margin-bottom:14px;
  text-transform:uppercase;
}
.section-label::before{
  content:"";
  width:26px;height:1px;
  background:var(--accent);
  display:inline-block;
}
.section-title{
  font-size:clamp(1.55rem,3vw,2.4rem);
  line-height:1.28;
  letter-spacing:-.01em;
  margin-bottom:16px;
}
.section-sub{
  color:var(--muted);
  font-size:1rem;
  line-height:1.9;
  max-width:800px;
}
.bg-alt{background:var(--bg-section)}

/* features */
.feature-row{
  display:grid;
  grid-template-columns:1.02fr .98fr;
  gap:clamp(30px,5.6vw,80px);
  align-items:center;
  padding:38px 0;
  border-bottom:1px solid rgba(255,255,255,.06);
}
.feature-row:first-child{padding-top:8px}
.feature-row:last-child{border-bottom:0;padding-bottom:0}
.feature-row.reverse .feature-copy{order:2}
.feature-row.reverse .feature-media{order:1}
.feature-kicker{
  display:inline-flex;
  align-items:center;
  gap:12px;
  font-size:.82rem;
  letter-spacing:.16em;
  color:var(--warm);
  margin-bottom:18px;
  font-weight:700;
}
.feature-kicker b{
  display:inline-flex;
  width:36px;height:26px;
  align-items:center;
  justify-content:center;
  border-radius:6px;
  background:rgba(245,184,90,.12);
  border:1px solid rgba(245,184,90,.18);
  font-size:.82rem;
  color:var(--warm);
}
.feature-copy h3{
  font-size:clamp(1.3rem,2.2vw,1.82rem);
  margin-bottom:16px;
  letter-spacing:-.01em;
}
.feature-copy p{
  color:var(--body);
  margin-bottom:20px;
  font-size:1rem;
  line-height:1.85;
}
.feature-points{
  display:flex;
  flex-direction:column;
  gap:12px;
  margin-bottom:26px;
}
.feature-points li{
  padding-left:26px;
  position:relative;
  color:#c2d0e6;
  font-size:.95rem;
}
.feature-points li::before{
  content:"";
  position:absolute;
  left:0;top:9px;
  width:9px;height:9px;
  border-radius:3px;
  background:var(--accent);
  box-shadow:0 0 8px rgba(33,230,193,.4);
}
.feature-link{
  display:inline-flex;
  align-items:center;
  gap:8px;
  color:var(--primary-bright);
  font-size:.93rem;
  min-height:44px;
  border-bottom:1px solid rgba(99,166,255,.4);
  transition:all .2s;
}
.feature-link:hover{color:var(--accent);border-color:var(--accent);gap:12px}

/* media frame */
.feature-media{position:relative}
.media-frame{
  background:rgba(12,22,38,.72);
  border:1px solid rgba(255,255,255,.1);
  border-radius:20px;
  overflow:hidden;
  box-shadow:var(--shadow-glass);
  transition:transform .3s,border-color .3s;
}
.media-frame:hover{
  transform:translateY(-4px);
  border-color:rgba(255,255,255,.2);
}
.window-bar{
  display:flex;
  align-items:center;
  gap:8px;
  height:40px;
  padding:0 15px;
  background:rgba(255,255,255,.045);
  border-bottom:1px solid rgba(255,255,255,.08);
}
.window-bar span{
  width:10px;height:10px;
  border-radius:50%;
  background:rgba(255,255,255,.18);
}
.window-bar span:nth-child(1){background:#f66a5e}
.window-bar span:nth-child(2){background:#f5bd4f}
.window-bar span:nth-child(3){background:#61c454}
.window-bar em{
  font-style:normal;
  font-size:.7rem;
  margin-left:12px;
  color:var(--weak);
  letter-spacing:.08em;
}
.media-thumb{
  aspect-ratio:16 / 10;
  background:#122238;
  overflow:hidden;
}
.media-thumb img{
  width:100%;
  height:100%;
  object-fit:cover;
  transition:transform .5s ease,filter .5s ease;
}
.media-frame:hover .media-thumb img{
  transform:scale(1.025);
  filter:saturate(1.08);
}
.media-cap{
  padding:12px 16px;
  font-size:.78rem;
  color:var(--weak);
  border-top:1px solid rgba(255,255,255,.06);
  letter-spacing:.04em;
  background:rgba(255,255,255,.02);
}

/* device scene */
.device-row{
  display:grid;
  grid-template-columns:1.12fr .88fr;
  gap:clamp(32px,5vw,72px);
  align-items:center;
}
.device-copy .feature-copy{padding-right:8px}
.scene-list{
  display:flex;
  flex-direction:column;
  gap:20px;
  margin:30px 0 0;
}
.scene-list li{
  display:grid;
  grid-template-columns:38px 1fr;
  gap:16px;
  align-items:flex-start;
}
.scene-num{
  width:38px;height:30px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  background:rgba(33,230,193,.1);
  border:1px solid rgba(33,230,193,.2);
  color:var(--accent);
  font-size:.85rem;
  font-weight:700;
  border-radius:8px;
  letter-spacing:.04em;
}
.scene-list p{color:var(--body);font-size:.95rem;line-height:1.75}
.scene-list p strong{color:#dce8f9;font-weight:600}
.access-card{
  border:1px solid rgba(255,255,255,.1);
  border-radius:var(--radius-glass);
  background:
    linear-gradient(150deg,rgba(255,255,255,.06),rgba(255,255,255,.02) 100%);
  padding:clamp(24px,3vw,34px);
  box-shadow:var(--shadow-card);
}
.access-card h3{font-size:1.16rem;color:#fff;margin-bottom:12px}
.access-card>.access-intro{color:#9fafca;font-size:.92rem;line-height:1.8;margin-bottom:22px}
.check-list{display:grid;gap:13px}
.check-list li{
  position:relative;
  padding-left:25px;
  color:#b8c7de;
  font-size:.93rem;
}
.check-list li::before{
  content:"✓";
  position:absolute;
  left:0;top:-1px;
  color:var(--accent);
  font-weight:800;
  font-size:.92rem;
}
.browser-tags{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin-top:22px;
}
.browser-tags span{
  padding:5px 10px;
  border:1px solid rgba(255,255,255,.14);
  border-radius:6px;
  font-size:.78rem;
  color:#aabdda;
  background:rgba(255,255,255,.04);
}

/* flow process */
.steps-block{
  border-top:1px solid rgba(255,255,255,.06);
  background:
    radial-gradient(810px 180px at 15% 5%,rgba(62,139,255,.08),transparent 62%),
    var(--bg-body);
  border-bottom:1px solid rgba(255,255,255,.06);
}
.steps-grid{
  display:grid;
  grid-template-columns:minmax(0,.72fr) repeat(4,minmax(0,1fr));
  gap:16px;
  align-items:stretch;
}
.steps-intro{
  background:transparent;
  padding:16px 0;
}
.steps-intro h2{
  margin-bottom:18px;
}
.steps-intro p{color:var(--muted);font-size:.95rem}
.step-item{
  position:relative;
  padding:24px 20px 24px 22px;
  background:rgba(255,255,255,.05);
  border:1px solid rgba(255,255,255,.08);
  border-radius:16px;
  overflow:hidden;
  transition:all .24s;
}
.step-item:hover{
  background:rgba(255,255,255,.08);
  border-color:rgba(255,255,255,.18);
}
.step-item::before{
  content:"";
  position:absolute;
  left:0;top:0;bottom:0;
  width:3px;
  background:linear-gradient(180deg,var(--primary),var(--accent));
  opacity:.75;
}
.step-no{
  font-size:.9rem;
  letter-spacing:.12em;
  color:var(--accent);
  font-weight:700;
  margin-bottom:14px;
}
.step-item h3{font-size:1.02rem;color:#eaf1ff;margin-bottom:10px}
.step-item p{color:#9aabc6;font-size:.88rem;line-height:1.7}

/* faq */
.faq-wrap{
  max-width:860px;
  margin:0 auto;
}
.faq-title-row{
  margin-bottom:38px;
  text-align:center;
}
.faq-title-row .section-label{justify-content:center}
.faq-title-row .section-label::before{display:none}
.faq-title-row h2{font-size:clamp(1.5rem,3vw,2.3rem)}
.faq-group-title{
  font-size:.86rem;
  letter-spacing:.22em;
  color:var(--warm);
  font-weight:700;
  margin:10px 0 6px;
}
.faq-group{
  border-top:1px solid rgba(255,255,255,.12);
  margin-bottom:26px;
}
.faq-item{
  border-bottom:1px solid rgba(255,255,255,.09);
}
.faq-item summary{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:24px;
  cursor:pointer;
  padding:24px 4px;
  list-style:none;
  color:#dce7f6;
  font-size:1rem;
  font-weight:600;
  transition:color .2s;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary:hover{color:#fff}
.faq-item summary::after{
  content:"+";
  flex:0 0 26px;
  width:26px;height:26px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border-radius:50%;
  border:1px solid rgba(255,255,255,.2);
  color:var(--accent);
  font-size:1.02rem;
  font-weight:400;
  transition:all .25s;
}
.faq-item[open] summary::after{
  transform:rotate(45deg);
  border-color:var(--accent);
  background:rgba(33,230,193,.12);
}
.faq-item[open] summary{color:#fff}
.faq-body{
  padding:0 28px 26px 4px;
  color:var(--muted);
  line-height:1.85;
  font-size:.95rem;
  max-width:760px;
}
.faq-body a{color:var(--primary-bright);border-bottom:1px solid rgba(99,166,255,.4)}
.faq-body a:hover{color:var(--accent);border-color:var(--accent)}

/* CTA */
.cta-zone{
  padding:clamp(4rem,6vw,6rem) 0;
  background:var(--bg-section);
}
.cta-box{
  position:relative;
  border:1px solid rgba(255,255,255,.11);
  border-radius:24px;
  overflow:hidden;
  padding:clamp(36px,6vw,72px);
  text-align:center;
  background:
    radial-gradient(620px 190px at 8% 0%,rgba(62,139,255,.16),transparent 65%),
    radial-gradient(520px 200px at 92% 20%,rgba(33,230,193,.15),transparent 60%),
    rgba(255,255,255,.035);
  box-shadow:var(--shadow-glass);
}
.cta-tag{
  display:inline-block;
  padding:6px 12px;
  border:1px solid rgba(255,255,255,.16);
  border-radius:99px;
  color:var(--accent);
  font-size:.82rem;
  letter-spacing:.12em;
  margin-bottom:22px;
}
.cta-box h2{
  font-size:clamp(1.55rem,3.4vw,2.5rem);
  max-width:740px;
  margin:0 auto 18px;
}
.cta-box p{max-width:680px;color:var(--muted);margin:0 auto 32px;line-height:1.85}
.cta-btns{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:center;
  gap:16px;
}

/* footer */
.footer{
  background:var(--bg-deep);
  border-top:1px solid rgba(255,255,255,.07);
  padding-top:clamp(48px,7vw,82px);
  padding-bottom:30px;
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(0,1.35fr) .75fr .75fr .85fr;
  gap:clamp(28px,4vw,52px);
  border-bottom:1px solid rgba(255,255,255,.07);
  padding-bottom:44px;
}
.footer-brand{
  display:block;
  color:#fff;
  font-weight:800;
  font-size:1.2rem;
  margin-bottom:14px;
}
.footer-desc{
  color:var(--muted);
  font-size:.94rem;
  margin-bottom:20px;
  max-width:360px;
  line-height:1.9;
}
.footer-support{
  display:flex;
  flex-wrap:wrap;
  gap:8px 20px;
}
.footer-support span{
  color:#9aabc9;
  font-size:.85rem;
}
.footer-support span::before{
  content:"·";
  color:var(--accent);
  margin-right:8px;
  font-weight:800;
}
.footer-title{
  font-size:.95rem;
  font-weight:700;
  color:#dfeaf9;
  margin-bottom:16px;
  letter-spacing:.04em;
}
.footer-links li{margin-bottom:9px}
.footer-links a{
  font-size:.88rem;
  color:#8494ab;
  transition:color .2s,padding-left .2s;
}
.footer-links a:hover{
  color:var(--accent);
  padding-left:4px;
}
.footer-bottom{
  padding-top:24px;
  display:flex;
  flex-wrap:wrap;
  gap:10px 28px;
  justify-content:space-between;
  align-items:center;
}
.footer-bottom p{
  font-size:.82rem;
  color:var(--weak);
  line-height:1.7;
}

@media (max-width:1100px){
  .main-nav{gap:20px}
  .main-nav a{font-size:.9rem}
  .header-login-desktop{font-size:.84rem}
}
@media (max-width:960px){
  .main-nav{display:none}
  .header-login-desktop{display:none}
  .menu-toggle{display:inline-flex;align-items:center;gap:4px}
  .header-inner{min-height:66px}
  .steps-grid{grid-template-columns:1fr 1fr}
  .steps-intro{grid-column:1 / -1}
  .device-row{grid-template-columns:1fr}
  .feature-row{
    grid-template-columns:1fr;
    gap:24px;
    padding:30px 0;
  }
  .feature-row.reverse .feature-copy{order:1}
  .feature-row.reverse .feature-media{order:2}
  .media-frame{
    max-width:720px;
  }
  .footer-top{grid-template-columns:1fr 1fr}
}
@media (max-width:620px){
  .container{padding-left:18px;padding-right:18px}
  .brand{font-size:.98rem}
  .menu-toggle{font-size:.88rem}
  .page-banner{padding-top:54px}
  .banner-actions{width:100%}
  .banner-actions .btn{width:100%}
  .feature-row{gap:0;padding:26px 0}
  .feature-row:first-child{padding-top:6px}
  .feature-copy h3{font-size:1.28rem}
  .feature-copy p{font-size:.94rem;line-height:1.8}
  .media-frame{border-radius:16px}
  .steps-grid{grid-template-columns:1fr}
  .steps-intro{padding:8px 0}
  .access-card{padding:24px 20px}
  .footer-top{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;text-align:center;justify-content:center}
  .cta-box{padding-left:22px;padding-right:22px}
  .cta-btns .btn{width:100%}
  .faq-body{padding-right:0}
  .faq-item summary{font-size:.94rem}
}

/* roulang page: category4 */
:root{
  --bg:#08101E;
  --bg-2:#0B1525;
  --bg-deep:#060B14;
  --panel:rgba(255,255,255,.055);
  --panel-2:rgba(255,255,255,.035);
  --line:rgba(255,255,255,.10);
  --line-bright:rgba(255,255,255,.18);
  --white:#F3F7FF;
  --text:#B7C4DB;
  --text-2:#8494AB;
  --muted:rgba(255,255,255,.42);
  --blue:#3E8BFF;
  --blue-bright:#63A6FF;
  --cyan:#21E6C1;
  --amber:#F5B85A;
  --danger:#FF7A7A;
  --radius-s:6px;
  --radius-m:12px;
  --radius-l:16px;
  --radius-xl:24px;
  --shadow:0 10px 30px rgba(3,8,18,.28);
  --shadow-glass:0 18px 40px rgba(2,6,18,.38);
  --container:1200px;
  --header-h:72px;
  --section-space:clamp(4.5rem,8vw,7rem);
  --font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue","PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);line-height:1.8;font-size:1rem;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body::before{content:"";position:fixed;inset:0;pointer-events:none;z-index:0;background:radial-gradient(circle at 18% 0%,rgba(62,139,255,.08),transparent 36%),radial-gradient(circle at 82% 24%,rgba(33,230,193,.04),transparent 28%)}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none;transition:color .25s ease}
p{margin:0 0 1rem}
h1,h2,h3,h4,h5,h6{margin:0 0 .9rem;color:var(--white);line-height:1.3;letter-spacing:-.015em;font-weight:800}
button{font-family:inherit;line-height:1.5}
input,select,textarea{font-family:inherit}
address{font-style:normal}
ul,ol{padding:0;margin:0 0 1.2rem}
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px;border-radius:4px}
::selection{background:rgba(33,230,193,.25);color:var(--white)}
.container{max-width:var(--container);margin-inline:auto;padding-inline:clamp(16px,4vw,48px);position:relative;z-index:1}
.section{padding-block:var(--section-space);position:relative}
.section-tag{display:inline-flex;align-items:center;gap:8px;font-size:.8rem;color:var(--cyan);letter-spacing:.1em;text-transform:uppercase;margin-bottom:1rem;font-weight:600}
.section-tag::before{content:"";width:24px;height:1px;background:var(--cyan);opacity:.7}
.site-heading{max-width:720px;margin-bottom:clamp(2rem,4vw,3.2rem)}
.site-heading h2{font-size:clamp(1.5rem,3vw,2.4rem);margin-bottom:1rem}
.site-heading p{color:var(--text);font-size:1rem;max-width:720px;margin-bottom:0}
.site-heading.center{margin-inline:auto;text-align:center}
.site-heading.center .section-tag::before{display:none}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:.55rem;border-radius:12px;min-height:48px;padding:.8rem 1.5rem;font-weight:700;font-size:.96rem;transition:all .3s ease;border:0;cursor:pointer;line-height:1.2;text-align:center}
.btn-primary{background:linear-gradient(135deg,rgba(62,139,255,.22),rgba(33,230,193,.14));border:1px solid rgba(62,139,255,.45);color:var(--white);box-shadow:0 0 0 1px rgba(62,139,255,.12),0 0 26px rgba(62,139,255,.12)}
.btn-primary:hover{background:linear-gradient(135deg,rgba(62,139,255,.34),rgba(33,230,193,.24));border-color:rgba(33,230,193,.55);color:var(--white);box-shadow:0 0 34px rgba(33,230,193,.18);transform:translateY(-1px)}
.btn-ghost{background:transparent;border:1px solid rgba(255,255,255,.24);color:var(--white)}
.btn-ghost:hover{border-color:rgba(255,255,255,.5);transform:translateX(3px);color:var(--cyan)}
.btn-small{min-height:42px;padding:.55rem 1.1rem;border-radius:10px;font-size:.9rem}

.header{position:sticky;top:0;z-index:1000;background:rgba(8,16,30,.76);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid rgba(255,255,255,.08)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:var(--header-h);gap:1.5rem}
.brand{display:inline-flex;font-weight:800;font-size:clamp(1.05rem,2vw,1.32rem);color:var(--white);letter-spacing:.01em;white-space:nowrap;transition:color .25s ease}
.brand:hover{color:var(--cyan)}
.main-nav{display:flex;align-items:center;gap:2px}
.main-nav a{position:relative;display:inline-block;padding:10px 12px;font-size:.93rem;font-weight:500;color:var(--text-2);white-space:nowrap;transition:color .25s ease}
.main-nav a::after{content:"";position:absolute;left:50%;bottom:2px;width:5px;height:5px;border-radius:50%;background:var(--cyan);opacity:0;transform:translateX(-50%) scale(.4);transition:opacity .25s ease,transform .25s ease,box-shadow .25s ease}
.main-nav a:hover{color:var(--white)}
.main-nav a:hover::after{opacity:1;transform:translateX(-50%) scale(1);box-shadow:0 0 0 4px rgba(33,230,193,.12)}
.main-nav a.active{color:var(--white)}
.main-nav a.active::after{opacity:1;transform:translateX(-50%) scale(1);box-shadow:0 0 0 4px rgba(33,230,193,.12)}
.header-login{display:inline-flex;align-items:center;font-size:.9rem;font-weight:600;color:var(--text);border-bottom:1px solid rgba(255,255,255,.22);line-height:1.6;padding:2px 2px;transition:color .25s ease,border-color .25s ease}
.header-login:hover{color:var(--cyan);border-color:rgba(33,230,193,.55)}
.menu-toggle{display:none;align-items:center;gap:8px;background:transparent;border:0;padding:8px 6px;cursor:pointer;color:var(--text);font-size:.9rem;font-weight:500}
.menu-toggle:hover{color:var(--white)}
.mobile-drawer{display:none;position:absolute;top:100%;left:0;right:0;background:rgba(7,13,24,.98);backdrop-filter:blur(18px);border-bottom:1px solid rgba(255,255,255,.08);padding:14px 0 26px;z-index:999}
.mobile-drawer.open{display:block;animation:drawerIn .3s ease}
.mobile-drawer-inner{display:flex;flex-direction:column;gap:0}
.mobile-drawer a{display:block;padding:14px 0;font-size:1.05rem;font-weight:600;color:var(--text);border-bottom:1px solid rgba(255,255,255,.06)}
.mobile-drawer a:hover,.mobile-drawer a.active{color:var(--white)}
.mobile-drawer a.active::before{content:"●";color:var(--cyan);font-size:.55rem;vertical-align:middle;margin-right:8px;top:-2px;position:relative}
.drawer-cta{margin-top:18px;text-align:center;background:rgba(62,139,255,.14);border:1px solid rgba(62,139,255,.4);color:var(--white);border-radius:12px;padding:14px 20px}
.drawer-cta:hover{background:rgba(33,230,193,.14);border-color:rgba(33,230,193,.4);color:var(--cyan)}
.drawer-cta.active{border-color:rgba(33,230,193,.4)}
@keyframes drawerIn{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}

.about-hero{position:relative;padding:clamp(120px,16vw,190px) 0 clamp(3rem,5vw,5rem);background:linear-gradient(180deg,rgba(8,16,30,.82) 0%,rgba(8,16,30,.94) 100%),url('/assets/images/backpic/back-3.png') center/cover no-repeat;border-bottom:1px solid rgba(255,255,255,.06)}
.about-hero:after{content:"";position:absolute;right:8%;bottom:-1px;width:220px;height:1px;background:linear-gradient(90deg,transparent,rgba(33,230,193,.5),transparent)}
.about-hero-inner{max-width:860px}
.page-eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:.82rem;color:var(--cyan);font-weight:600;letter-spacing:.12em;margin-bottom:1.4rem;text-transform:uppercase}
.page-eyebrow:before{content:"";width:36px;height:1px;background:var(--cyan);opacity:.75}
.about-hero h1{font-size:clamp(2.1rem,4.5vw,3.5rem);line-height:1.15;color:var(--white);margin-bottom:1.6rem;letter-spacing:-.02em}
.about-hero p{font-size:clamp(.98rem,1.6vw,1.12rem);color:#AEBBD2;max-width:780px;margin-bottom:2.2rem;line-height:1.85}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px}
.hero-actions .btn{box-shadow:0 18px 40px rgba(2,6,18,.38)}
.breadcrumb{display:flex;align-items:center;gap:8px;margin-top:2.2rem;font-size:.85rem;color:var(--muted)}
.breadcrumb a{color:var(--text-2);transition:color .2s}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb span{opacity:.5}
.breadcrumb .cur{color:var(--text)}

.intro-grid{display:grid;grid-template-columns:minmax(0,1.14fr) minmax(0,.86fr);gap:clamp(1.6rem,4vw,3.5rem);align-items:center}
.intro-copy{padding-right:1rem}
.intro-copy h2{font-size:clamp(1.5rem,2.8vw,2.35rem);margin-bottom:1.4rem}
.intro-copy p{color:var(--text);margin-bottom:1.2rem}
.intro-copy .notice-line{border-left:3px solid var(--cyan);background:rgba(33,230,193,.06);padding:.8rem 1.1rem;border-radius:0 12px 12px 0;font-size:.92rem;color:var(--text-2)}
.intro-media{position:relative}
.intro-media:before{content:"";position:absolute;inset:-14px -10px auto auto;width:150px;height:150px;border-radius:50%;border:1px dashed rgba(33,230,193,.3);opacity:.8}
.intro-media img{position:relative;width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:var(--radius-xl);border:1px solid rgba(255,255,255,.12);box-shadow:var(--shadow-glass);background:linear-gradient(135deg,#1C283B,#0B1525)}
.media-note{position:absolute;left:16px;bottom:16px;z-index:2;background:rgba(8,16,30,.78);backdrop-filter:blur(8px);padding:6px 14px;border-radius:999px;color:var(--text);font-size:.78rem;border:1px solid rgba(255,255,255,.12)}
.media-note strong{color:var(--cyan);font-weight:600}

.about-scope{background:var(--bg-2)}
.about-scope .site-heading p{margin-bottom:0}
.scope-grid{display:grid;grid-template-columns:minmax(0,1.18fr) minmax(0,.82fr);gap:clamp(1.2rem,3vw,1.8rem);align-items:stretch}
.scope-main{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius-l);overflow:hidden;box-shadow:var(--shadow);transition:border-color .3s ease,background .3s ease}
.scope-main:hover{border-color:rgba(255,255,255,.18)}
.scope-media{position:relative;aspect-ratio:16/10;overflow:hidden}
.scope-media img{width:100%;height:100%;object-fit:cover;transition:transform 4s ease}
.scope-main:hover .scope-media img{transform:scale(1.04)}
.scope-media:after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(8,16,30,0) 38%,rgba(8,16,30,.78) 100%)}
.scope-media-tag{position:absolute;top:14px;left:14px;z-index:2;background:rgba(8,16,30,.72);backdrop-filter:blur(7px);color:var(--cyan);font-size:.75rem;padding:4px 12px;border-radius:999px;border:1px solid rgba(255,255,255,.12)}
.scope-body{padding:1.6rem 1.7rem 1.8rem}
.scope-body h3{font-size:1.35rem;margin-bottom:.8rem;letter-spacing:-.01em}
.scope-body p{color:var(--text);font-size:.97rem;margin-bottom:0}
.scope-split{display:flex;flex-direction:column;gap:clamp(1.2rem,2.2vw,1.7rem)}
.split-card{background:rgba(255,255,255,.045);border:1px solid var(--line);border-radius:var(--radius-l);padding:1.7rem 1.6rem;flex:1;box-shadow:var(--shadow)}
.split-card:hover{border-color:rgba(33,230,193,.28);transform:translateY(-2px);transition:all .3s ease}
.split-card h3{font-size:1.12rem;display:flex;align-items:center;gap:.6rem;margin-bottom:.7rem}
.split-card h3 .dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--cyan);box-shadow:0 0 0 4px rgba(33,230,193,.1)}
.split-card p{color:var(--text-2);font-size:.9rem;margin-bottom:.4rem}
.tag-uniform{display:inline-block;background:rgba(62,139,255,.12);border:1px solid rgba(62,139,255,.3);color:#9AC3FF;font-size:.72rem;font-weight:600;padding:2px 10px;border-radius:var(--radius-s);margin-bottom:12px}

.about-milestone{position:relative}
.milestone-wrap{max-width:920px;margin:0 auto}
.milestone-list{position:relative;list-style:none;padding:0;margin:0}
.milestone-list:before{content:"";position:absolute;left:5px;top:12px;bottom:12px;width:1px;background:linear-gradient(180deg,transparent,rgba(62,139,255,.6),rgba(33,230,193,.5),transparent)}
.milestone-item{position:relative;padding:0 0 42px 44px}
.milestone-item:last-child{padding-bottom:0}
.milestone-item:before{content:"";position:absolute;left:0;top:8px;width:11px;height:11px;border-radius:50%;background:var(--bg);border:2px solid var(--cyan);box-shadow:0 0 0 5px rgba(33,230,193,.1)}
.milestone-item:nth-child(2):before{border-color:var(--blue)}
.milestone-item:nth-child(3):before{border-color:var(--cyan)}
.milestone-item:nth-child(4):before{border-color:var(--amber)}
.milestone-step{display:inline-flex;align-items:center;color:var(--cyan);font-size:.78rem;letter-spacing:.08em;font-weight:700;margin-bottom:8px;text-transform:uppercase}
.milestone-item h3{font-size:1.25rem;margin-bottom:.5rem}
.milestone-item p{color:var(--text);font-size:.98rem;max-width:760px;margin-bottom:0}
.milestone-item p .tip-weak{color:var(--muted);font-size:.9rem}

.cta-strip{margin-block:var(--section-space);background:linear-gradient(120deg,rgba(8,16,30,.92),rgba(8,16,30,.82)),url('/assets/images/backpic/back-1.png') center/cover no-repeat;border-top:1px solid rgba(255,255,255,.08);border-bottom:1px solid rgba(255,255,255,.08);padding:clamp(2.6rem,5vw,4rem) 0;position:relative}
.cta-strip .container{display:flex;align-items:center;justify-content:space-between;gap:2rem}
.cta-intro{max-width:700px}
.cta-intro .section-tag{margin-bottom:.8rem}
.cta-intro h2{font-size:clamp(1.5rem,3vw,2.2rem);margin-bottom:.4rem}
.cta-intro p{color:var(--text-2);margin-bottom:0}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px;flex-shrink:0}

.faq-wrap{max-width:860px;margin:0 auto}
.faq-item{background:var(--panel-2);border:1px solid var(--line);border-radius:16px;padding:1.2rem 1.3rem;margin-bottom:1rem;transition:border-color .3s ease,background .3s ease}
.faq-item[open]{background:rgba(255,255,255,.06);border-color:rgba(33,230,193,.22)}
.faq-item summary{list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:16px;color:var(--white);font-size:1.02rem;font-weight:700;min-height:40px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary:hover{color:var(--cyan)}
.faq-item summary .marker{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:50%;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);color:var(--cyan);font-size:1.2rem;font-weight:400;flex-shrink:0;transition:transform .3s ease,border-color .3s ease,background .3s ease}
.faq-item[open] summary .marker{transform:rotate(45deg);border-color:var(--cyan);background:rgba(33,230,193,.1)}
.faq-answer{padding:1rem 0 .4rem;border-top:1px solid rgba(255,255,255,.06);margin-top:.8rem;color:var(--text);font-size:.96rem}
.faq-answer a{color:var(--cyan);border-bottom:1px solid rgba(33,230,193,.3)}
.faq-answer a:hover{border-bottom-color:var(--cyan)}

.contact-block{background:var(--bg-2);border-top:1px solid rgba(255,255,255,.06);border-bottom:1px solid rgba(255,255,255,.06)}
.contact-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(1.5rem,4vw,3rem);align-items:center}
.contact-info h2{font-size:clamp(1.5rem,2.8vw,2.2rem);margin-bottom:1.4rem}
.contact-info p{color:var(--text);margin-bottom:1.2rem}
.contact-meta{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius-m);padding:1rem 1.2rem;margin-top:1.6rem}
.contact-meta span{display:block;color:var(--text-2);font-size:.9rem;line-height:1.9}
.contact-meta span strong{color:var(--white)}
.contact-card{background:linear-gradient(145deg,rgba(255,255,255,.08),rgba(255,255,255,.035));border:1px solid var(--line);border-radius:24px;padding:2rem;box-shadow:var(--shadow-glass)}
.contact-card h3{font-size:1.2rem;margin-bottom:1.3rem}
.contact-mail{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:transparent;border:1px solid rgba(62,139,255,.4);border-radius:12px;color:#B4D6FF;font-weight:600;padding:.9rem 1.2rem;width:100%;transition:all .3s ease}
.contact-mail:hover{background:rgba(62,139,255,.12);color:var(--cyan);border-color:var(--cyan)}
.contact-card .helper-text{color:var(--text-2);font-size:.85rem;margin-top:1rem;line-height:1.8}

.footer{background:var(--bg-deep);border-top:1px solid rgba(255,255,255,.06);padding:clamp(2.8rem,6vw,4.4rem) 0 1.6rem;position:relative}
.footer::before{content:"";position:absolute;top:0;left:0;width:100%;height:1px;background:linear-gradient(90deg,transparent,rgba(33,230,193,.2),transparent)}
.footer-top{display:grid;grid-template-columns:1.55fr .8fr .8fr .9fr;gap:2rem;padding-bottom:2.6rem}
.footer-brand{display:block;color:var(--white);font-size:1.2rem;font-weight:800;letter-spacing:.01em;margin-bottom:1rem}
.footer-desc{color:var(--text-2);font-size:.9rem;line-height:1.8;margin-bottom:1.2rem;max-width:520px}
.footer-support{display:flex;flex-wrap:wrap;gap:8px 14px}
.footer-support span{color:rgba(255,255,255,.36);font-size:.78rem;border:1px solid rgba(255,255,255,.08);padding:3px 10px;border-radius:999px}
.footer-title{font-size:.9rem;color:var(--white);margin-bottom:1rem;font-weight:700;letter-spacing:.02em;opacity:.95}
.footer-links{list-style:none;margin:0;padding:0}
.footer-links li{padding:0;margin-bottom:.6rem}
.footer-links a{color:var(--text-2);font-size:.88rem;line-height:1.7}
.footer-links a:hover{color:var(--cyan)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.06);padding-top:1.5rem;display:flex;flex-wrap:wrap;gap:.4rem 1.5rem;justify-content:space-between;align-items:center;color:rgba(255,255,255,.36);font-size:.8rem}
.footer-bottom p{margin:0}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}
}
@media (max-width:1023.98px){
  .main-nav{display:none}
  .header-login-desktop{display:none}
  .menu-toggle{display:inline-flex;background:transparent}
  .header-actions{display:flex;align-items:center;gap:10px}
  .intro-grid,.scope-grid,.contact-grid{grid-template-columns:1fr}
  .intro-media{order:2}
  .intro-copy{padding-right:0}
  .cta-strip .container{flex-direction:column;align-items:flex-start}
  .footer-top{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:767.98px){
  body{font-size:.96rem}
  .header-inner{height:64px;gap:.8rem}
  .brand{font-size:1rem}
  .header-login{font-size:.78rem}
  .mobile-drawer a{font-size:.95rem;padding:13px 0}
  .drawer-cta{font-size:.95rem}
  .about-hero{padding-top:clamp(110px,24vw,160px)}
  .about-hero h1{font-size:clamp(2rem,7vw,2.7rem)}
  .about-hero p{font-size:.98rem}
  .site-heading h2{font-size:1.6rem}
  .milestone-list:before{left:4px}
  .milestone-item{padding-left:36px;padding-bottom:34px}
  .milestone-item:before{width:9px;height:9px}
  .milestone-item h3{font-size:1.12rem}
  .faq-item{padding:1rem}
  .faq-item summary{font-size:.95rem}
  .contact-card{padding:1.4rem}
  .footer-top{grid-template-columns:1fr;gap:1.6rem}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .scope-body{padding:1.2rem}
  .btn{width:100%;min-height:50px}
  .cta-actions .btn{width:100%}
  .hero-actions .btn{width:100%}
  .hero-actions{width:100%}
  .faq-answer{font-size:.92rem}
}
@media (max-width:520px){
  .container{padding-inline:18px}
  .intro-media:before{width:80px;height:80px;inset:-12px -8px auto auto}
  .scope-grid{gap:1.2rem}
  .footer-top{grid-template-columns:1fr}
  .brand{max-width:80vw;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
}