/* roulang page: index */
:root{
  --bg:#060B18;
  --bg-soft:#0A1322;
  --card:#0E1729;
  --glass-bg:rgba(255,255,255,0.055);
  --glass-line:rgba(168,204,255,0.16);
  --line:rgba(150,190,240,0.14);
  --accent:#3DBBFF;
  --accent-light:#7ED6FF;
  --gold:#FFC567;
  --success:#2BE0A6;
  --danger:#FF6B8B;
  --text:#E8F1FC;
  --muted:#A9BDD8;
  --weak:#7189A8;
  --radius-s:8px;
  --radius:16px;
  --radius-l:24px;
  --shadow:0 12px 32px rgba(0,6,20,0.28);
  --shadow-soft:0 18px 48px rgba(2,24,60,0.4);
  --font-sys:"PingFang SC","Microsoft YaHei","Noto Sans SC","Helvetica Neue",Arial,sans-serif;
  --container:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-sys);
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  z-index:0;
  background-image:
    linear-gradient(rgba(94,129,177,0.035) 1px,transparent 1px),
    linear-gradient(90deg,rgba(94,129,177,0.035) 1px,transparent 1px);
  background-size:72px 72px;
}
img{max-width:100%;display:block}
a{color:var(--accent);text-decoration:none;transition:color .22s}
ul,ol{list-style:none}
button,input,textarea,select{font-family:inherit;font-size:1rem;color:inherit}
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,.faq-q:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:3px;
  border-radius:6px;
}
.container{max-width:var(--container);margin:0 auto;padding:0 20px;position:relative;z-index:1}
.section{padding:96px 0;position:relative}
.section-alt{background:var(--bg-soft)}
.section-line{border-top:1px solid var(--line)}
.section-head{max-width:720px;margin:0 auto 42px;text-align:center}
.section-kicker{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-size:14px;
  letter-spacing:.2em;
  color:var(--accent);
  margin-bottom:12px;
  font-weight:500;
}
.section-kicker::before,.section-kicker::after{
  content:"";
  width:18px;height:1px;
  background:linear-gradient(90deg,transparent,var(--accent));
}
.section-head h2{
  font-size:34px;
  line-height:1.3;
  font-weight:800;
  letter-spacing:.01em;
  color:var(--text);
}
.section-sub{
  margin-top:10px;
  color:var(--muted);
  font-size:16px;
  line-height:1.9;
}
h1,h2,h3,h4{scroll-margin-top:100px}
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  border:none;
  cursor:pointer;
  border-radius:10px;
  font-weight:600;
  font-size:16px;
  line-height:1;
  padding:12px 22px;
  transition:all .18s;
  white-space:nowrap;
}
.btn-primary{
  background:var(--accent);
  color:#061523;
  box-shadow:0 0 0 rgba(61,187,255,0);
}
.btn-primary:hover{
  background:var(--accent-light);
  box-shadow:0 0 18px rgba(61,187,255,0.35);
  transform:translateY(-1px);
}
.btn-primary:active{transform:translateY(1px)}
.btn-ghost{
  background:rgba(255,255,255,0.03);
  color:var(--accent);
  border:1px solid rgba(61,187,255,0.5);
}
.btn-ghost:hover{
  border-color:var(--accent-light);
  background:rgba(61,187,255,0.07);
  color:var(--accent-light);
}
.btn-lg{padding:14px 28px;font-size:16px}
.btn-block{width:100%}
.btn-link-style{
  display:inline-flex;
  align-items:center;
  gap:6px;
  color:var(--accent);
  font-weight:600;
  background:none;
  cursor:pointer;
}
.btn-link-style:hover{color:var(--accent-light)}
.arrow-ic{transition:transform .18s}
.btn-link-style:hover .arrow-ic{transform:translateX(4px)}
/* header */
.site-header{
  position:sticky;
  top:0;
  z-index:100;
  height:80px;
  background:rgba(6,11,24,0.82);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid rgba(150,190,240,0.12);
}
.header-inner{
  height:80px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
}
.brand{
  display:flex;
  align-items:center;
  gap:10px;
  flex-shrink:0;
}
.brand-mark{
  width:40px;
  height:40px;
  border-radius:10px;
  display:flex;
  align-items:center;
  justify-content:center;
  background:linear-gradient(135deg,rgba(61,187,255,0.24),rgba(61,187,255,0.05));
  border:1px solid rgba(61,187,255,0.45);
  color:var(--accent-light);
  font-size:19px;
  font-weight:800;
  box-shadow:0 0 16px rgba(61,187,255,0.15);
}
.brand-name{
  font-size:20px;
  font-weight:800;
  color:var(--text);
  letter-spacing:.02em;
  line-height:1.2;
}
.brand-name small{
  display:block;
  font-size:11px;
  font-weight:500;
  color:var(--weak);
  letter-spacing:.3em;
  line-height:1.2;
  margin-top:3px;
}
.main-nav ul{
  display:flex;
  align-items:center;
  gap:8px;
}
.nav-link{
  display:inline-block;
  padding:10px 14px;
  color:var(--muted);
  font-weight:500;
  border-radius:8px;
  position:relative;
  transition:color .2s;
}
.nav-link::after{
  content:"";
  position:absolute;
  left:14px;
  right:14px;
  bottom:5px;
  height:2px;
  border-radius:2px;
  background:var(--accent);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .2s;
}
.nav-link:hover{color:var(--text)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link.active{color:var(--accent-light)}
.nav-link.active::after{transform:scaleX(1)}
.nav-cta{margin-left:8px;padding:11px 18px;font-size:15px}
.burger{
  display:none;
  width:42px;
  height:42px;
  background:transparent;
  border:1px solid var(--line);
  border-radius:10px;
  align-items:center;
  flex-direction:column;
  justify-content:center;
  gap:4px;
  cursor:pointer;
}
.burger span{width:20px;height:2px;background:var(--text);border-radius:3px;transition:all .25s}
.mobile-nav{
  display:none;
  position:fixed;
  top:80px;
  left:0;
  right:0;
  z-index:99;
  background:rgba(6,11,24,0.97);
  border-bottom:1px solid var(--line);
  padding:24px 20px 30px;
  transform:translateY(-16px);
  opacity:0;
  pointer-events:none;
  transition:all .22s;
}
.mobile-nav.open{
  opacity:1;
  transform:translateY(0);
  pointer-events:auto;
}
.mobile-nav ul{display:flex;flex-direction:column;gap:2px}
.mobile-nav a{
  display:block;
  padding:14px 12px;
  border-radius:10px;
  font-size:17px;
  font-weight:600;
  color:var(--text);
}
.mobile-nav a:hover,.mobile-nav a.active{background:rgba(61,187,255,0.08);color:var(--accent-light)}
.mobile-nav .btn{margin-top:18px;width:100%}
/* hero */
.hero-sec{
  padding-top:112px;
  padding-bottom:100px;
  overflow:hidden;
}
.hero-sec::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:0;
  background:
   linear-gradient(180deg,rgba(6,11,24,0.94) 0%,rgba(6,11,24,0.72) 55%,rgba(6,11,24,0.97) 100%),
   url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
}
.hero-sec::after{
  content:"";
  position:absolute;
  top:18%;
  right:-140px;
  width:440px;
  height:440px;
  border-radius:50%;
  background:radial-gradient(circle,rgba(61,187,255,0.11),transparent 65%);
  pointer-events:none;
}
.hero-grid{
  display:grid;
  grid-template-columns:1.22fr 0.78fr;
  gap:52px;
  align-items:center;
}
.hero-copy{max-width:620px}
.hero-eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:5px 12px;
  border-radius:40px;
  background:rgba(61,187,255,0.1);
  border:1px solid rgba(61,187,255,0.25);
  color:var(--accent-light);
  font-size:13px;
  font-weight:600;
}
.hero-eyebrow i{width:7px;height:7px;border-radius:50%;background:var(--success);box-shadow:0 0 10px var(--success)}
.hero-copy h1{
  margin-top:20px;
  font-size:46px;
  line-height:1.24;
  font-weight:800;
  color:var(--text);
  letter-spacing:.01em;
}
.hero-copy h1 span{
  color:var(--accent-light);
}
.hero-lead{
  margin-top:20px;
  font-size:17px;
  line-height:1.9;
  color:var(--muted);
  max-width:560px;
}
.hero-actions{
  margin-top:30px;
  display:flex;
  gap:14px;
  flex-wrap:wrap;
}
.hero-mini{
  margin-top:36px;
  display:flex;
  gap:28px;
  flex-wrap:wrap;
}
.hero-mini li{
  display:flex;
  align-items:center;
  gap:8px;
  color:var(--muted);
  font-size:14px;
}
.hero-mini li::before{
  content:"";
  width:16px;
  height:16px;
  border-radius:50%;
  background:rgba(61,187,255,0.15);
  border:1px solid rgba(61,187,255,0.5);
}
.hero-panel{
  position:relative;
  border-radius:24px;
  background:var(--glass-bg);
  border:1px solid var(--glass-line);
  padding:28px;
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  box-shadow:var(--shadow);
}
.panel-top{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  margin-bottom:20px;
}
.panel-status{
  display:flex;
  align-items:center;
  gap:8px;
  font-size:14px;
  color:var(--text);
}
.panel-status i{
  width:8px;height:8px;
  border-radius:50%;
  background:var(--success);
  box-shadow:0 0 12px var(--success);
}
.panel-badge{
  font-size:12px;
  color:var(--gold);
  border:1px solid rgba(255,197,103,0.4);
  padding:2px 10px;
  border-radius:30px;
  background:rgba(255,197,103,0.1);
}
.panel-item{
  padding:16px 0;
  border-top:1px solid var(--line);
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:16px;
}
.panel-item span{
  color:var(--weak);
  font-size:14px;
  flex-shrink:0;
}
.panel-item strong{
  color:var(--text);
  font-size:15px;
  font-weight:600;
  text-align:right;
}
.panel-note{
  margin-top:16px;
  padding-top:14px;
  border-top:1px dashed var(--line);
  color:var(--weak);
  font-size:13px;
  line-height:1.7;
}
/* index card row */
.quick-row{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:20px;
  margin-top:-52px;
}
.quick-card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:16px;
  padding:22px 20px;
  transition:border-color .2s,box-shadow .2s,transform .2s;
}
.quick-card:hover{
  border-color:rgba(61,187,255,0.5);
  box-shadow:var(--shadow);
  transform:translateY(-3px);
}
.quick-num{
  font-family:"SFMono-Regular","Roboto Mono",monospace;
  color:var(--accent);
  font-size:14px;
  letter-spacing:.1em;
}
.quick-card h3{
  margin-top:8px;
  font-size:18px;
  font-weight:700;
  color:var(--text);
}
.quick-card p{
  margin-top:6px;
  color:var(--weak);
  font-size:14px;
  line-height:1.7;
}
/* service matrix */
.matrix-grid{
  display:grid;
  grid-template-columns:repeat(12,1fr);
  gap:20px;
}
.mat-card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:16px;
  overflow:hidden;
  transition:border-color .2s,box-shadow .2s;
  display:flex;
  flex-direction:column;
  position:relative;
}
.mat-card:hover{box-shadow:var(--shadow);border-color:rgba(61,187,255,0.4)}
.mat-card.col-w8{grid-column:span 8}
.mat-card.col-w4{grid-column:span 4}
.mat-card.col-w12{grid-column:span 12}
.mat-body{padding:26px}
.mat-card.feature-card .mat-body{
  display:flex;
  flex-direction:column;
  justify-content:center;
  height:100%;
}
.mat-card.feature-card{
  background:
    linear-gradient(90deg,rgba(61,187,255,0.07) 0%,rgba(8,19,38,0.2) 50%),
    var(--card);
}
.mat-title{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  margin-bottom:8px;
}
.mat-title h3{
  font-size:20px;
  font-weight:700;
  color:var(--text);
}
.mat-card p{
  color:var(--muted);
  font-size:15px;
  line-height:1.8;
}
.mat-list{
  margin-top:18px;
  display:flex;
  flex-wrap:wrap;
  gap:8px;
}
.chip{
  display:inline-flex;
  align-items:center;
  padding:5px 12px;
  font-size:13px;
  color:var(--muted);
  border:1px solid var(--line);
  border-radius:30px;
  background:rgba(255,255,255,0.02);
}
.chip.hot{
  color:var(--gold);
  border-color:rgba(255,197,103,0.3);
  background:rgba(255,197,103,0.08);
}
.mat-image{
  overflow:hidden;
  border-bottom:1px solid var(--line);
}
.mat-image img{
  width:100%;
  height:220px;
  object-fit:cover;
  transition:transform .3s;
}
.mat-card:hover .mat-image img{transform:scale(1.02)}
.mat-iconline{
  width:44px;height:44px;
  border-radius:10px;
  border:1px solid rgba(61,187,255,0.3);
  background:rgba(61,187,255,0.08);
  display:flex;
  align-items:center;
  justify-content:center;
  color:var(--accent);
  font-size:18px;
  font-weight:600;
  margin-bottom:16px;
}
.card-link{
  margin-top:14px;
  display:inline-flex;
  align-items:center;
  gap:6px;
  color:var(--accent);
  font-weight:600;
  font-size:14px;
}
.card-link:hover{color:var(--accent-light)}
/* info news */
.info-grid{
  display:grid;
  grid-template-columns:0.95fr 1.05fr;
  gap:20px;
  align-items:stretch;
}
.news-feature{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:16px;
  overflow:hidden;
  transition:border-color .2s,box-shadow .2s;
}
.news-feature:hover{box-shadow:var(--shadow);border-color:rgba(61,187,255,0.34)}
.news-feature .feature-media img{
  width:100%;
  height:230px;
  object-fit:cover;
  background:#0b1322;
}
.feature-body{padding:24px}
.post-tags{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:8px}
.tag-mark{
  display:inline-block;
  font-size:12px;
  padding:3px 10px;
  border:1px solid rgba(61,187,255,0.4);
  color:var(--accent-light);
  border-radius:30px;
  background:rgba(61,187,255,0.07);
}
.tag-soft{
  display:inline-block;
  font-size:12px;
  padding:3px 10px;
  border:1px solid var(--line);
  color:var(--muted);
  border-radius:30px;
  background:rgba(255,255,255,0.02);
}
.feature-body h3{
  font-size:21px;
  line-height:1.5;
  font-weight:700;
  color:var(--text);
}
.feature-body h3 a{color:var(--text)}
.feature-body h3 a:hover{color:var(--accent-light)}
.feature-body p{
  color:var(--muted);
  font-size:15px;
  margin-top:10px;
  overflow:hidden;
  display:-webkit-box;
  -webkit-line-clamp:3;
  -webkit-box-orient:vertical;
}
.post-meta{
  margin-top:14px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  color:var(--weak);
  font-size:13px;
}
.post-meta time{letter-spacing:.02em}
.post-meta a{
  display:inline-flex;
  align-items:center;
  gap:6px;
  color:var(--accent);
  font-weight:600;
}
.post-meta a:hover{color:var(--accent-light)}
.news-list-column{
  display:flex;
  flex-direction:column;
  gap:14px;
}
.news-list-item{
  display:flex;
  gap:16px;
  align-items:center;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:16px;
  padding:14px 16px;
  transition:border-color .2s,box-shadow .2s;
}
.news-list-item:hover{border-color:rgba(61,187,255,0.42);box-shadow:var(--shadow-soft)}
.list-thumb{
  width:112px;
  height:80px;
  flex-shrink:0;
  border-radius:10px;
  overflow:hidden;
}
.list-thumb img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.list-info{min-width:0}
.list-info .post-tags{margin-bottom:3px}
.list-info h4{
  font-size:16px;
  font-weight:600;
  line-height:1.45;
  color:var(--text);
  overflow:hidden;
  text-overflow:ellipsis;
  display:-webkit-box;
  -webkit-line-clamp:1;
  -webkit-box-orient:vertical;
}
.list-info h4 a{color:var(--text)}
.list-info h4 a:hover{color:var(--accent-light)}
.list-info p{
  font-size:14px;
  color:var(--weak);
  margin-top:4px;
  overflow:hidden;
  display:-webkit-box;
  -webkit-line-clamp:1;
  -webkit-box-orient:vertical;
}
.news-empty{
  min-height:280px;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:16px;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  text-align:center;
  grid-column:1/-1;
}
.empty-icon{
  font-size:34px;
  color:var(--weak);
  opacity:.7;
  border-bottom:1px solid var(--line);
  padding-bottom:16px;
  margin-bottom:12px;
}
.news-empty p{color:var(--muted);font-size:16px}
.more-wrap{
  margin-top:30px;
  display:flex;
  justify-content:center;
}
/* comparison */
.compare-grid{
  display:grid;
  grid-template-columns:0.9fr 1.1fr;
  gap:24px;
}
.compare-card{
  background:var(--card);
  border:1px dashed var(--line);
  border-radius:16px;
  padding:30px;
}
.compare-card.best{
  display:flex;
  flex-direction:column;
  border:1px solid rgba(61,187,255,0.45);
  background:linear-gradient(140deg,rgba(61,187,255,0.08),rgba(10,19,34,0.4));
  box-shadow:var(--shadow);
  position:relative;
}
.best-badge{
  position:absolute;
  top:18px;
  right:18px;
  font-size:12px;
  color:var(--gold);
  padding:4px 10px;
  border-radius:30px;
  border:1px solid rgba(255,197,103,0.45);
  background:rgba(255,197,103,0.1);
}
.compare-card h3{
  display:flex;
  align-items:center;
  gap:10px;
  font-size:19px;
  font-weight:700;
  color:var(--text);
  margin-bottom:12px;
}
.compare-card h3 i{color:var(--weak)}
.compare-card.best h3 i{color:var(--accent)}
.compare-card p{
  color:var(--muted);
  font-size:15px;
}
.compare-list{margin-top:16px}
.compare-list li{
  display:flex;
  gap:8px;
  align-items:baseline;
  color:var(--weak);
  font-size:14px;
  padding:4px 0;
}
.compare-list li::before{
  content:"";
  width:5px;height:5px;
  border-radius:50%;
  background:var(--accent);
  flex-shrink:0;
}
.compare-list li.good::before{background:var(--success)}
/* steps */
.steps-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:20px;
  counter-reset:step;
}
.step-card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:16px;
  padding:28px 22px;
  transition:border-color .2s,transform .2s;
  position:relative;
}
.step-card::before{
  counter-increment:step;
  content:"0" counter(step);
  font-size:15px;
  font-weight:600;
  color:var(--accent);
  opacity:.85;
  letter-spacing:.1em;
}
.step-card:hover{transform:translateY(-3px);border-color:rgba(61,187,255,0.45)}
.step-card h3{
  margin-top:14px;
  font-size:18px;
  font-weight:700;
  color:var(--text);
  line-height:1.5;
}
.step-card p{
  margin-top:6px;
  color:var(--weak);
  font-size:14px;
  line-height:1.7;
}
/* faq */
.faq-wrap{
  max-width:860px;
  margin:0 auto;
}
.faq-item{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:10px;
  padding:0;
  overflow:hidden;
  margin-bottom:12px;
  transition:border-color .18s,background .18s;
}
.faq-item.open{
  border-color:rgba(61,187,255,0.4);
  background:rgba(61,187,255,0.03);
}
.faq-q{
  width:100%;
  background:transparent;
  border:none;
  text-align:left;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:18px;
  padding:18px 22px;
  cursor:pointer;
  font-size:18px;
  font-weight:600;
  color:var(--text);
  line-height:1.5;
}
.faq-q:hover{color:var(--accent-light)}
.faq-icon{
  width:24px;height:24px;
  flex-shrink:0;
  display:flex;
  align-items:center;
  justify-content:center;
  border-radius:50%;
  border:1px solid var(--line);
  color:var(--accent);
  font-size:18px;
  transition:transform .2s,background .18s;
}
.faq-item.open .faq-icon{transform:rotate(45deg);background:rgba(61,187,255,.12)}
.faq-a{
  display:none;
  padding:0 22px 20px;
  color:var(--muted);
  font-size:16px;
  line-height:1.8;
}
.faq-item.open .faq-a{display:block}
/* cta form */
.contact-panel{
  border-radius:24px;
  background:
    linear-gradient(135deg,rgba(61,187,255,0.08),rgba(9,19,35,0.55)),
    var(--bg-soft);
  border:1px solid var(--line);
  display:grid;
  grid-template-columns:0.9fr 1.1fr;
  overflow:hidden;
  box-shadow:var(--shadow);
}
.contact-info{
  padding:42px 36px;
  border-right:1px solid var(--line);
}
.contact-info h2{
  font-size:30px;
  font-weight:800;
  line-height:1.35;
}
.contact-info p{
  margin-top:12px;
  color:var(--muted);
  font-size:15px;
  line-height:1.9;
}
.contact-feat{
  margin-top:28px;
  display:flex;
  flex-direction:column;
  gap:12px;
}
.contact-feat li{
  display:flex;
  align-items:center;
  gap:10px;
  color:var(--muted);
  font-size:14px;
}
.contact-feat li::before{
  content:"";
  width:14px;height:14px;
  border-radius:50%;
  border:1px solid rgba(61,187,255,0.5);
  background:rgba(61,187,255,0.1);
  flex-shrink:0;
}
.form-box{padding:42px 36px}
.form-row{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:16px;
}
.form-group{margin-bottom:16px}
.form-group label{
  display:block;
  font-size:14px;
  color:var(--muted);
  margin-bottom:6px;
  font-weight:500;
}
.form-control{
  width:100%;
  background:rgba(3,8,18,0.72);
  border:1px solid var(--line);
  border-radius:12px;
  height:50px;
  padding:0 14px;
  color:var(--text);
  outline:none;
  transition:border .2s,box-shadow .2s,background .2s;
}
textarea.form-control{
  height:110px;
  padding:14px;
  resize:vertical;
  min-height:80px;
  line-height:1.7;
}
.form-control::placeholder{color:var(--weak)}
.form-control:focus{
  border-color:var(--accent);
  box-shadow:0 0 0 3px rgba(61,187,255,0.18);
  background:rgba(3,8,18,0.9);
}
.form-msg{
  display:none;
  margin-top:14px;
  padding:14px 16px;
  border-radius:8px;
  font-size:14px;
}
.form-msg.success{
  display:flex;
  color:var(--success);
  background:rgba(43,224,166,0.08);
  border:1px solid rgba(43,224,166,0.3);
  align-items:center;
  gap:8px;
}
.form-msg.error{
  display:flex;
  color:var(--danger);
  background:rgba(255,107,139,0.1);
  border:1px solid rgba(255,107,139,0.3);
  align-items:center;
  gap:8px;
}
.form-privacy{
  margin-top:10px;
  color:var(--weak);
  font-size:13px;
  line-height:1.7;
}
/* footer */
.site-footer{
  padding-top:62px;
  background:#050a15;
  border-top:1px solid var(--line);
}
.footer-main{
  display:grid;
  grid-template-columns:1.5fr 0.85fr 1fr;
  gap:42px;
  padding-bottom:40px;
}
.footer-brand-name{
  font-size:24px;
  font-weight:800;
  color:var(--text);
  display:flex;
  align-items:center;
  gap:10px;
}
.footer-tagline{
  margin-top:10px;
  color:var(--weak);
  font-size:14px;
  line-height:1.8;
  max-width:340px;
}
.footer-title{
  font-size:15px;
  font-weight:700;
  color:var(--text);
  letter-spacing:.05em;
  margin-bottom:12px;
}
.footer-links li{margin-bottom:6px}
.footer-links a{color:var(--weak);font-size:14px}
.footer-links a:hover{color:var(--accent-light)}
.footer-bottom{
  border-top:1px solid var(--line);
  padding:24px 0 26px;
  text-align:center;
  color:var(--weak);
  font-size:13px;
}
.footer-bottom a{color:var(--weak)}
.footer-bottom a:hover{color:var(--accent)}
@media (max-width:1099px){
  .hero-grid{gap:38px;grid-template-columns:1.12fr 0.88fr}
  .hero-copy h1{font-size:40px}
  .quick-row{grid-template-columns:repeat(2,1fr);row-gap:16px}
  .contact-panel{grid-template-columns:1fr}
  .contact-info{border-right:none;border-bottom:1px solid var(--line);padding-bottom:24px}
  .form-box{padding-top:6px}
}
@media (max-width:900px){
  .main-nav,.nav-cta{display:none}
  .burger{display:flex}
  .mobile-nav{display:block}
  .hero-grid{grid-template-columns:1fr;gap:32px}
  .hero-sec{padding-top:76px;padding-bottom:50px}
  .quick-row{margin-top:16px}
  .matrix-grid{grid-template-columns:1fr}
  .mat-card.col-w8,.mat-card.col-w4{grid-column:1}
  .info-grid{grid-template-columns:1fr}
  .compare-grid{grid-template-columns:1fr}
  .steps-grid{grid-template-columns:repeat(2,1fr)}
  .section{padding:72px 0}
  .contact-panel .contact-info,.contact-panel .form-box{padding:28px 24px}
  .form-row{grid-template-columns:1fr}
  .footer-main{grid-template-columns:1fr;gap:24px}
}
@media (max-width:767px){
  body{font-size:15px}
  .container{padding:0 16px}
  .section{padding:56px 0}
  .section-head h2{font-size:27px}
  .section-sub{font-size:15px}
  .hero-copy h1{font-size:32px}
  .hero-lead{font-size:16px}
  .hero-actions{flex-direction:column}
  .hero-actions .btn{justify-content:center}
  .hero-panel{padding:20px}
  .quick-row{grid-template-columns:1fr}
  .steps-grid{grid-template-columns:1fr}
  .feature-media img{height:180px}
  .news-list-item{flex-direction:row;padding:12px}
  .list-thumb{width:88px;height:66px}
  .list-info h4{font-size:15px}
  .compare-card{padding:22px}
  .faq-q{font-size:16px;padding:15px 16px}
  .faq-a{padding-right:16px;padding-left:16px}
  .contact-info h2{font-size:25px}
}

/* roulang page: article */
:root{
  --page-bg:#060B18;
  --section-bg:#0A1322;
  --card-bg:#0E1729;
  --glass-bg:rgba(255,255,255,.055);
  --glass-border:rgba(168,204,255,.16);
  --primary:#3DBBFF;
  --primary-light:#7ED6FF;
  --accent:#FFC567;
  --success:#2BE0A6;
  --danger:#FF6B8B;
  --text:#E8F1FC;
  --text-sub:#A9BDD8;
  --muted:#7189A8;
  --line:rgba(150,190,240,.14);
  --radius-sm:8px;
  --radius-md:16px;
  --radius-lg:24px;
  --container:1180px;
  --shadow:0 12px 32px rgba(0,6,20,.28);
  --shadow-hover:0 18px 48px rgba(2,24,60,.4);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:
    radial-gradient(circle at 88% 2%,rgba(61,187,255,.08),transparent 24rem),
    var(--page-bg);
  color:var(--text);
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  z-index:0;
  background-image:
    linear-gradient(rgba(120,170,230,.04) 1px,transparent 1px),
    linear-gradient(90deg,rgba(120,170,230,.035) 1px,transparent 1px);
  background-size:56px 56px;
  mask-image:radial-gradient(circle at 30% 10%,#000,transparent 75%);
}
a{color:var(--primary);text-decoration:none;transition:color .2s ease,border-color .2s ease,background .2s ease}
a:hover{color:var(--primary-light)}
img{max-width:100%;display:block}
ul,ol{list-style:none}
button,input,textarea{font:inherit;color:inherit}
.container{
  width:100%;
  max-width:var(--container);
  margin:0 auto;
  padding:0 24px;
  position:relative;
}
.skip-link{
  position:absolute;
  left:-100px;
  top:10px;
  z-index:200;
  background:#3DBBFF;
  color:#061523;
  padding:10px 16px;
  border-radius:8px;
  font-weight:600;
}
.skip-link:focus{left:16px;color:#061523}
.site-header{
  position:sticky;
  top:0;
  z-index:100;
  height:78px;
  background:rgba(6,11,24,.82);
  backdrop-filter:blur(18px);
  -webkit-backdrop-filter:blur(18px);
  border-bottom:1px solid rgba(150,190,240,.18);
}
.header-inner{
  height:78px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
}
.brand{
  display:flex;
  align-items:center;
  gap:10px;
  flex-shrink:0;
  color:var(--text);
}
.brand-mark{
  width:38px;
  height:38px;
  border-radius:11px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  font-weight:800;
  font-size:17px;
  letter-spacing:.02em;
  color:#06172A;
  background:linear-gradient(135deg,var(--primary-light),var(--primary));
  box-shadow:0 0 16px rgba(61,187,255,.25);
}
.brand-name{
  font-size:20px;
  font-weight:800;
  letter-spacing:.01em;
  line-height:1.1;
  color:#EAF4FF;
}
.brand-name small{
  display:block;
  font-size:11px;
  font-weight:500;
  letter-spacing:.3em;
  color:#8FB7DD;
  margin-top:3px;
}
.main-nav ul{
  display:flex;
  align-items:center;
  gap:34px;
}
.nav-link{
  position:relative;
  font-size:15px;
  font-weight:500;
  color:var(--text-sub);
  padding:8px 2px;
  transition:color .2s ease;
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  width:100%;
  height:2px;
  border-radius:2px;
  background:var(--primary);
  transform:scaleX(0);
  transition:transform .25s ease;
}
.nav-link:hover,.nav-link.active{
  color:#fff;
}
.nav-link:hover::after,.nav-link.active::after{
  transform:scaleX(1);
}
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border:1px solid transparent;
  border-radius:10px;
  padding:11px 24px;
  font-size:15px;
  font-weight:600;
  line-height:1.4;
  cursor:pointer;
  text-align:center;
  transition:background .2s ease,border-color .2s ease,box-shadow .2s ease,transform .15s ease;
}
.btn:active{transform:translateY(1px)}
.btn:focus-visible,
.nav-link:focus-visible,
.burger:focus-visible,
.text-link:focus-visible{
  outline:2px solid var(--primary);
  outline-offset:3px;
}
.btn-primary{
  background:var(--primary);
  color:#061523;
  box-shadow:0 0 0 rgba(61,187,255,0);
}
.btn-primary:hover{
  background:var(--primary-light);
  color:#061523;
  box-shadow:0 0 18px rgba(61,187,255,.35);
}
.btn-ghost{
  background:rgba(255,255,255,.04);
  border-color:rgba(61,187,255,.45);
  color:var(--primary);
}
.btn-ghost:hover{
  background:rgba(61,187,255,.1);
  border-color:var(--primary-light);
  color:var(--primary-light);
}
.header-cta{
  padding:10px 20px;
  flex-shrink:0;
}
.burger{
  display:none;
  width:42px;
  height:42px;
  background:transparent;
  border:1px solid var(--line);
  border-radius:10px;
  cursor:pointer;
  align-items:center;
  justify-content:center;
  flex-direction:column;
  gap:5px;
}
.burger span{
  display:block;
  width:18px;
  height:2px;
  border-radius:4px;
  background:#CFE4FA;
  transition:transform .25s ease,opacity .25s ease;
}
.burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger.open span:nth-child(2){opacity:0}
.burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.drawer-cta{
  display:none;
}
.article-main{
  position:relative;
  z-index:1;
}
.article-hero{
  position:relative;
  padding:72px 0 52px;
  overflow:hidden;
  background:
    linear-gradient(180deg,rgba(6,11,24,.9),rgba(6,11,24,.82)),
    url("/assets/images/backpic/back-2.webp") center 25% / cover no-repeat;
  border-bottom:1px solid rgba(150,190,240,.12);
}
.article-hero::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:120px;
  background:linear-gradient(180deg,transparent,rgba(6,11,24,.96));
  pointer-events:none;
}
.article-hero .container{
  max-width:900px;
}
.breadcrumb{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:8px;
  font-size:14px;
  color:var(--muted);
  margin-bottom:22px;
}
.breadcrumb a{
  color:var(--muted);
}
.breadcrumb a:hover{
  color:var(--primary-light);
}
.breadcrumb .divider{
  color:#4B6284;
}
.breadcrumb .current{
  color:var(--text-sub);
  font-weight:500;
}
.article-kicker{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:10px;
  margin-bottom:16px;
}
.badge{
  display:inline-flex;
  align-items:center;
  gap:6px;
  border:1px solid rgba(61,187,255,.35);
  background:rgba(61,187,255,.08);
  color:var(--primary-light);
  font-size:13px;
  font-weight:500;
  padding:4px 12px;
  border-radius:999px;
  line-height:1.5;
}
.article-date{
  color:var(--muted);
  font-size:13px;
}
.article-title{
  font-size:clamp(28px,4.4vw,42px);
  line-height:1.25;
  letter-spacing:.01em;
  color:#F2F8FF;
  font-weight:800;
  max-width:820px;
  word-break:break-word;
}
.page-article-wrap{
  max-width:880px;
  margin:0 auto;
  padding:64px 0 40px;
}
.article-body-card{
  position:relative;
  background:rgba(14,23,41,.72);
  border:1px solid rgba(150,190,240,.14);
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow);
  padding:clamp(24px,4vw,56px);
}
.article-body-card::before{
  content:"";
  position:absolute;
  left:-1px;
  top:34px;
  width:3px;
  height:90px;
  border-radius:3px;
  background:linear-gradient(180deg,var(--primary),transparent);
}
.prose{
  max-width:760px;
  margin:0 auto;
  color:#DCE8F7;
  font-size:16.5px;
  line-height:1.9;
}
.prose p{
  margin:0 0 1.4em;
}
.prose > *:first-child{
  margin-top:0;
}
.prose h2,
.prose h3,
.prose h4{
  margin:1.8em 0 .7em;
  color:#F0F7FF;
  line-height:1.4;
}
.prose h2{
  font-size:24px;
  padding-top:.8em;
  border-top:1px solid rgba(150,190,240,.1);
}
.prose h3{
  font-size:20px;
}
.prose h4{
  font-size:17px;
}
.prose a{
  color:var(--primary-light);
  text-decoration:underline;
  text-underline-offset:4px;
  text-decoration-color:rgba(61,187,255,.4);
}
.prose a:hover{
  color:#fff;
}
.prose ul,
.prose ol{
  margin:0 0 1.5em;
  padding-left:26px;
}
.prose ul{
  list-style:disc;
}
.prose ol{
  list-style:decimal;
}
.prose li{
  margin-bottom:.5em;
}
.prose li::marker{
  color:var(--primary);
}
.prose img{
  border-radius:16px;
  margin:28px auto;
  border:1px solid rgba(150,190,240,.18);
  box-shadow:var(--shadow);
  height:auto;
}
.prose blockquote{
  margin:0 0 1.6em;
  padding:18px 22px 18px 26px;
  background:rgba(61,187,255,.07);
  border:1px solid rgba(61,187,255,.18);
  border-left:4px solid var(--primary);
  border-radius:12px 16px 16px 12px;
  color:#C7DEF5;
}
.prose blockquote p{
  margin-bottom:.5em;
}
.prose blockquote p:last-child{
  margin:0;
}
.prose code{
  background:rgba(61,187,255,.1);
  color:var(--primary-light);
  border:1px solid rgba(61,187,255,.15);
  padding:2px 7px;
  border-radius:6px;
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  font-size:.92em;
}
.prose pre{
  background:#081224;
  border:1px solid rgba(150,190,240,.14);
  border-radius:14px;
  padding:20px 22px;
  overflow-x:auto;
  color:#C9DEFF;
  margin:0 0 1.6em;
  line-height:1.7;
}
.prose pre code{
  background:transparent;
  border:0;
  color:inherit;
  padding:0;
}
.prose table{
  width:100%;
  border-collapse:collapse;
  margin:0 0 1.8em;
  font-size:15px;
}
.prose th,
.prose td{
  text-align:left;
  padding:11px 14px;
  border:1px solid rgba(150,190,240,.18);
  vertical-align:top;
}
.prose th{
  background:rgba(61,187,255,.08);
  color:#DDF1FF;
  font-weight:600;
}
.prose hr{
  border:0;
  border-top:1px dashed rgba(150,190,240,.2);
  margin:2.4em 0;
}
.prose strong{
  color:#F4FAFE;
  font-weight:650;
}
.article-end{
  max-width:760px;
  margin:32px auto 0;
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:18px;
  padding:20px 4px 2px 4px;
}
.article-end p{
  color:var(--muted);
  font-size:14px;
}
.end-actions{
  display:flex;
  gap:12px;
  align-items:center;
  flex-wrap:wrap;
}
.text-link{
  color:var(--muted);
  border-bottom:1px solid transparent;
  font-size:14px;
}
.text-link:hover{
  color:var(--primary-light);
  border-color:var(--primary);
}
.not-found-wrap{
  min-height:60vh;
  padding-top:80px;
  position:relative;
}
.not-found-card{
  max-width:680px;
  margin:0 auto;
  background:rgba(14,23,41,.8);
  border:1px solid rgba(150,190,240,.16);
  border-radius:24px;
  padding:60px 40px;
  text-align:center;
  box-shadow:var(--shadow);
}
.not-found-icon{
  width:76px;
  height:76px;
  margin:0 auto 24px;
  border-radius:24px;
  display:flex;
  align-items:center;
  justify-content:center;
  background:rgba(61,187,255,.08);
  border:1px solid rgba(61,187,255,.24);
  color:var(--primary-light);
}
.not-found-card h1{
  font-size:30px;
  margin-bottom:12px;
  color:#EFF7FF;
}
.not-found-card p{
  color:var(--text-sub);
  margin-bottom:28px;
}
.site-footer{
  background:#070D19;
  border-top:1px solid rgba(150,190,240,.1);
  margin-top:70px;
}
.footer-main{
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr;
  gap:48px;
  padding:54px 0 40px;
}
.footer-brand-name{
  display:flex;
  align-items:center;
  gap:12px;
  color:#EEF5FC;
  font-size:19px;
  font-weight:800;
  margin-bottom:14px;
}
.footer-tagline{
  color:#7C93B4;
  line-height:1.85;
  max-width:340px;
  font-size:14px;
}
.footer-title{
  color:#D7E7FA;
  font-weight:600;
  margin-bottom:16px;
  font-size:15px;
  letter-spacing:.02em;
}
.footer-links li{
  margin-bottom:11px;
}
.footer-links a{
  color:#8199B8;
  font-size:14px;
  transition:color .2s ease,padding-left .2s ease;
}
.footer-links a:hover{
  color:#3DBBFF;
  padding-left:4px;
}
.footer-bottom{
  border-top:1px solid rgba(150,190,240,.08);
  padding:18px 0 24px;
  display:flex;
  justify-content:center;
}
.footer-bottom p{
  color:#607795;
  font-size:13px;
  text-align:center;
}
@media (max-width:1100px){
  .main-nav ul{
    gap:22px;
  }
  .main-nav .nav-link{
    font-size:14px;
  }
}
@media (max-width:1023px){
  .header-inner{
    gap:14px;
  }
  .main-nav{
    position:fixed;
    top:78px;
    right:16px;
    width:min(320px,84vw);
    background:rgba(7,13,25,.98);
    border:1px solid rgba(150,190,240,.18);
    border-radius:18px;
    padding:20px 18px 26px;
    box-shadow:0 24px 60px rgba(0,6,20,.6);
    display:flex;
    flex-direction:column;
    gap:16px;
    opacity:0;
    transform:translateY(-10px);
    pointer-events:none;
    visibility:hidden;
    transition:opacity .22s ease,transform .22s ease,visibility .22s ease;
    z-index:100;
  }
  .main-nav.open{
    opacity:1;
    transform:translateY(0);
    pointer-events:auto;
    visibility:visible;
  }
  .main-nav ul{
    flex-direction:column;
    gap:6px;
    align-items:stretch;
  }
  .main-nav .nav-link{
    display:block;
    padding:12px 8px;
    border-radius:10px;
    font-size:15px;
  }
  .main-nav .nav-link::after{
    display:none;
  }
  .main-nav .nav-link:hover,
  .main-nav .nav-link.active{
    background:rgba(61,187,255,.09);
    color:var(--primary-light);
  }
  .header-cta{
    display:none;
  }
  .drawer-cta{
    display:inline-flex;
    margin-top:6px;
  }
  .burger{
    display:inline-flex;
  }
  .footer-main{
    grid-template-columns:1fr 1fr;
    gap:36px;
  }
}
@media (max-width:767px){
  .container{
    padding:0 16px;
  }
  .article-hero{
    padding:48px 0 42px;
  }
  .article-title{
    font-size:28px;
    line-height:1.32;
  }
  .page-article-wrap{
    padding-top:36px;
  }
  .article-body-card{
    border-radius:18px;
    padding:28px 20px 32px;
  }
  .prose{
    font-size:16px;
  }
  .article-end{
    align-items:center;
    justify-content:center;
    text-align:center;
    flex-direction:column;
  }
  .footer-main{
    grid-template-columns:1fr;
    gap:26px;
    padding-top:40px;
    padding-bottom:28px;
  }
  .footer-brand-name{
    margin-bottom:8px;
  }
  .not-found-card{
    padding:40px 22px;
  }
}

/* roulang page: category1 */
:root {
  --bg: #060B18;
  --bg2: #0A1322;
  --bg3: #0E1729;
  --card: #0E1729;
  --card-hover: #111D33;
  --line: rgba(150, 190, 240, 0.14);
  --line-strong: rgba(168, 204, 255, 0.32);
  --glass: rgba(255, 255, 255, 0.055);
  --primary: #3DBBFF;
  --primary-bright: #7ED6FF;
  --primary-dark: #061523;
  --amber: #FFC567;
  --green: #2BE0A6;
  --danger: #FF6B8B;
  --text: #E8F1FC;
  --text2: #A9BDD8;
  --text3: #7189A8;
  --r-sm: 8px;
  --r-md: 16px;
  --r-lg: 24px;
  --shadow: 0 12px 32px rgba(0, 6, 20, 0.28);
  --shadow-hover: 0 18px 48px rgba(2, 24, 60, 0.4);
  --font: PingFang SC, Microsoft YaHei, Noto Sans SC, sans-serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
}

body {
  background-color: var(--bg);
  background-image:
    linear-gradient(rgba(150, 190, 240, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(150, 190, 240, 0.04) 1px, transparent 1px);
  background-size: 84px 84px;
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.78;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body, h1, h2, h3, p, ul, ol, figure, blockquote {
  margin: 0;
  padding: 0;
}

ul, ol {
  list-style: none;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color .18s ease, border-color .18s ease, background-color .18s ease;
}

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

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

button {
  border: 0;
  cursor: pointer;
}

strong, b {
  color: #fff;
  font-weight: 600;
}

:focus-visible {
  outline: 2px solid var(--primary-bright);
  outline-offset: 3px;
  border-radius: 5px;
}

.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

.hidden {
  display: none !important;
}

/* ===== 按钮体系 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 10px;
  height: 44px;
  padding: 0 22px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  border: 1px solid transparent;
  transition: all .18s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: var(--primary-dark);
  box-shadow: 0 0 0 rgba(61, 187, 255, 0);
}

.btn-primary:hover {
  background: var(--primary-bright);
  box-shadow: 0 0 18px rgba(61, 187, 255, 0.35);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(1px);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(61, 187, 255, 0.55);
  color: var(--primary-bright);
}

.btn-ghost:hover {
  background: rgba(61, 187, 255, 0.1);
  color: #fff;
  border-color: var(--primary-bright);
}

.btn-block {
  width: 100%;
}

/* ===== 顶部导航 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 80px;
  background: rgba(6, 11, 24, 0.82);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  color: #fff;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  flex: 0 0 36px;
  border-radius: 10px;
  border: 1px solid rgba(61, 187, 255, 0.5);
  background: rgba(61, 187, 255, 0.12);
  color: var(--primary-bright);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .02em;
  box-shadow: 0 0 16px rgba(61, 187, 255, 0.12);
}

.brand-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.2;
}

.brand-name small {
  display: block;
  font-size: 10px;
  font-weight: 500;
  color: var(--text3);
  letter-spacing: .14em;
  text-transform: uppercase;
  line-height: 1.4;
}

.main-nav {
  display: flex;
  align-items: center;
}

.main-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  display: block;
  padding: 8px 14px;
  border-radius: 8px;
  color: var(--text2);
  font-size: 15px;
  font-weight: 500;
  position: relative;
}

.nav-link:hover {
  color: #fff;
  background: rgba(61, 187, 255, 0.08);
}

.nav-link.active {
  color: #fff;
  background: rgba(61, 187, 255, 0.15);
  font-weight: 600;
}

.nav-link.active::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 3px;
  height: 2px;
  border-radius: 2px;
  background: var(--primary-bright);
  box-shadow: 0 0 8px rgba(61, 187, 255, 0.7);
}

.nav-cta {
  height: 42px;
  margin-left: 8px;
  flex-shrink: 0;
}

.burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  align-items: center;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0;
  flex-shrink: 0;
}

.burger span {
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--text2);
  transition: all .2s ease;
}

.drawer-cta {
  display: none;
}

/* ===== 页面首屏 ===== */
.page-hero {
  position: relative;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(105deg, rgba(6, 11, 24, 0.96) 20%, rgba(6, 11, 24, 0.86) 58%, rgba(8, 18, 34, 0.78) 100%),
    url('/assets/images/backpic/back-1.webp') center / cover no-repeat;
}

.page-hero-inner {
  padding: 62px 0 52px;
}

.breadcrumb {
  margin-bottom: 34px;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 14px;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--text3);
  margin-right: 8px;
}

.breadcrumb a {
  color: var(--text3);
}

.breadcrumb a:hover {
  color: var(--primary-bright);
}

.breadcrumb [aria-current="page"] {
  color: var(--text2);
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(61, 187, 255, 0.1);
  border: 1px solid rgba(61, 187, 255, 0.3);
  color: var(--primary-bright);
  font-size: 13px;
  font-weight: 500;
}

.hero-eyebrow .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(43, 224, 166, 0.1);
}

.page-hero h1 {
  font-size: clamp(38px, 5vw, 54px);
  line-height: 1.2;
  color: #fff;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.hero-sub {
  max-width: 620px;
  margin-top: 18px;
  color: var(--text2);
  font-size: 17px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

/* ===== 目录 + 正文栅格 ===== */
.toc-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 44px;
  align-items: start;
  padding: 36px 0 80px;
}

.doc-article {
  min-width: 0;
  padding-top: 28px;
}

.toc-card {
  position: sticky;
  top: 100px;
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: var(--r-md);
  padding: 22px;
  box-shadow: var(--shadow);
}

.toc-title {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--text3);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 12px;
}

.toc-card ul {
  display: block;
}

.toc-card a {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: var(--text2);
  font-size: 14px;
  line-height: 1.6;
  padding: 8px 8px;
  border-radius: 8px;
}

.toc-card a:hover,
.toc-card a:focus-visible {
  background: rgba(61, 187, 255, 0.08);
  color: #fff;
}

.toc-card .toc-num {
  color: var(--primary);
  font-size: 12px;
  line-height: 1.8;
  min-width: 18px;
  font-variant-numeric: tabular-nums;
}

.doc-section {
  border-top: 1px solid var(--line);
  padding-top: 30px;
  margin-bottom: 54px;
}

.doc-section:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.doc-title-group {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 18px;
}

.doc-title-group .sec-no {
  color: var(--primary);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .08em;
  font-variant-numeric: tabular-nums;
}

.doc-section h2 {
  font-size: 25px;
  line-height: 1.35;
  color: #fff;
  font-weight: 700;
}

.doc-section p + p {
  margin-top: 14px;
}

.doc-section > p {
  color: var(--text2);
}

.doc-section .doc-lead {
  font-size: 17px;
  color: var(--text2);
  background: rgba(255, 255, 255, 0.03);
  border-left: 3px solid var(--primary);
  padding: 8px 16px;
  border-radius: 0 8px 8px 0;
  margin: 0 0 20px;
}

.doc-section h3 {
  font-size: 17px;
  margin-top: 24px;
  margin-bottom: 8px;
  color: #fff;
}

.doc-section .check-list {
  margin-top: 14px;
}

.doc-section .check-list li {
  position: relative;
  padding: 12px 12px 12px 40px;
  background: rgba(255, 255, 255, 0.035);
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--text2);
  margin-top: 10px;
  font-size: 15px;
}

.doc-section .check-list li::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 22px;
  width: 8px;
  height: 14px;
  border: 2px solid var(--green);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
  box-sizing: content-box;
}

.doc-section .check-list li strong {
  color: #fff;
  font-weight: 600;
}

.doc-figure {
  margin: 24px 0;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.doc-figure img {
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.doc-figure figcaption {
  padding: 12px 18px;
  font-size: 14px;
  color: var(--text3);
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
}

/* ===== 分类说明卡片 ===== */
.catalog-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 18px 0 8px;
}

.catalog-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 2px solid rgba(61, 187, 255, 0.7);
  border-radius: var(--r-md);
  padding: 24px 22px;
  transition: all .18s ease;
}

.catalog-card:hover {
  border-color: rgba(61, 187, 255, 0.45);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.catalog-card .catalog-name {
  display: inline-block;
  font-size: 17px;
  font-weight: 700;
  color: #fff;
  letter-spacing: .02em;
}

.catalog-card p {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text2);
}

/* ===== 首页内容地图 ===== */
.home-map-list {
  margin-top: 12px;
}

.home-map-list li {
  position: relative;
  padding: 16px 18px 16px 58px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--line);
  border-radius: 12px;
  margin-bottom: 10px;
  transition: border-color .18s ease, background-color .18s ease;
}

.home-map-list li:hover {
  border-color: rgba(61, 187, 255, 0.38);
  background: rgba(61, 187, 255, 0.05);
}

.home-map-list li::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 23px;
  width: 18px;
  height: 18px;
  border: 1px solid var(--line-strong);
  border-radius: 5px;
  background: rgba(61, 187, 255, 0.16);
  clip-path: polygon(50% 0, 100% 30%, 86% 100%, 14% 100%, 0 30%);
}

.home-map-list strong {
  color: #fff;
  font-size: 16px;
  font-weight: 600;
}

.home-map-list p {
  color: var(--text2);
  font-size: 15px;
  margin-top: 3px;
}

/* ===== 安全提示 ===== */
.security-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.security-item {
  background: rgba(255, 255, 255, 0.035);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px;
}

.security-item .sec-icon {
  display: inline-block;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(255, 197, 103, 0.12);
  margin-bottom: 12px;
}

.security-item strong {
  color: #fff;
}

.security-item p {
  color: var(--text2);
  font-size: 14px;
  margin-top: 5px;
}

/* ===== FAQ ===== */
.faq-panel {
  margin-top: 8px;
}

.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-item + .faq-item {
  margin-top: 0;
}

.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  width: 100%;
  padding: 20px 4px;
  background: transparent;
  color: #fff;
  font-size: 17px;
  font-weight: 600;
  text-align: left;
  line-height: 1.5;
  border-radius: 0;
  transition: color .18s ease;
}

.faq-q:hover {
  color: var(--primary-bright);
}

.faq-icon {
  position: relative;
  flex: 0 0 18px;
  width: 18px;
  height: 18px;
  margin-left: auto;
}

.faq-icon::before,
.faq-icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--text2);
  transition: all .2s ease;
}

.faq-icon::before {
  width: 14px;
  height: 2px;
  transform: translate(-50%, -50%);
}

.faq-icon::after {
  width: 2px;
  height: 14px;
  transform: translate(-50%, -50%);
}

.faq-item.open .faq-icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
  opacity: 0;
}

.faq-item.open .faq-icon::before {
  background: var(--primary);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height .26s ease;
}

.faq-a p {
  padding: 0 24px 22px 4px;
  color: var(--text2);
  font-size: 15px;
}

.faq-item.open {
  border-bottom-color: rgba(61, 187, 255, 0.4);
}

.faq-item.open .faq-a {
  max-height: 520px;
}

/* ===== 底部联系转化区 ===== */
.contact-zone {
  background: var(--bg2);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 80px 0;
  scroll-margin-top: 90px;
}

.contact-card {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 36px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: rgba(255, 255, 255, 0.045);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  padding: 42px;
  box-shadow: var(--shadow);
}

.contact-copy h2 {
  font-size: 28px;
  line-height: 1.3;
  color: #fff;
  font-weight: 700;
}

.contact-copy p {
  margin-top: 16px;
  color: var(--text2);
}

.contact-copy .point-list {
  margin-top: 22px;
}

.contact-copy .point-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-top: 10px;
  color: var(--text2);
  font-size: 15px;
}

.contact-copy .point-list .pin {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 12px rgba(61, 187, 255, 0.65);
  margin-top: 9px;
}

.contact-form-panel {
  background: rgba(6, 11, 24, 0.5);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 28px;
}

.field-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--text2);
  margin-bottom: 7px;
}

.form-control {
  display: block;
  width: 100%;
  height: 50px;
  border: 1px solid rgba(168, 204, 255, 0.24);
  border-radius: 10px;
  background: rgba(6, 11, 24, 0.66);
  color: var(--text);
  padding: 0 15px;
  transition: border-color .18s ease, box-shadow .18s ease;
}

textarea.form-control {
  height: auto;
  min-height: 120px;
  padding: 13px 15px;
  resize: vertical;
}

.form-control::placeholder {
  color: var(--text3);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(61, 187, 255, 0.18);
}

.form-success {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: rgba(43, 224, 166, 0.1);
  border: 1px solid rgba(43, 224, 166, 0.4);
  border-radius: 12px;
  padding: 16px 18px;
  margin-top: 16px;
  color: var(--green);
  font-size: 15px;
}

.form-success::before {
  content: "✓";
  padding-top: 1px;
  font-weight: 700;
}

.form-error {
  background: rgba(255, 107, 139, 0.1);
  border: 1px solid rgba(255, 107, 139, 0.42);
  border-radius: 12px;
  padding: 12px 16px;
  margin-top: 14px;
  color: var(--danger);
  font-size: 14px;
}

/* ===== 页脚 ===== */
.site-footer {
  background: #050914;
  border-top: 1px solid var(--line);
  padding: 70px 0 34px;
}

.footer-main {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.8fr) minmax(0, 0.9fr);
  gap: 52px;
}

.footer-brand-name {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-size: 18px;
  font-weight: 700;
}

.footer-tagline {
  margin-top: 16px;
  font-size: 14px;
  color: var(--text3);
  max-width: 360px;
}

.footer-title {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--text2);
  margin-bottom: 18px;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: var(--text3);
  font-size: 14px;
}

.footer-links a:hover {
  color: var(--primary-bright);
}

.footer-links li {
  color: var(--text3);
  font-size: 14px;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 52px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--text3);
}

/* ===== 响应式 ===== */
@media (max-width: 1099px) {
  .main-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: rgba(6, 11, 24, 0.97);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
    padding: 18px 24px 26px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity .2s ease, transform .2s ease, visibility .2s ease;
    box-shadow: 0 24px 40px rgba(0, 0, 0, 0.25);
  }

  .site-header.nav-open .main-nav {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .main-nav ul,
  .site-header.nav-open .main-nav ul {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
  }

  .nav-link {
    padding: 13px 12px;
    font-size: 16px;
    border-radius: 10px;
  }

  .nav-link.active::after {
    display: none;
  }

  .burger {
    display: inline-flex;
  }

  .drawer-cta {
    display: inline-flex;
    margin-top: 18px;
    width: 100%;
    height: 46px;
  }

  .toc-shell {
    grid-template-columns: minmax(0, 1fr);
  }

  .toc-card {
    display: none;
  }

  .contact-zone {
    padding: 64px 0;
  }
}

@media (max-width: 767px) {
  .container {
    padding: 0 16px;
  }

  .site-header {
    height: 70px;
  }

  .header-inner {
    height: 70px;
  }

  .brand-name {
    font-size: 16px;
  }

  .brand-mark {
    width: 33px;
    height: 33px;
    flex-basis: 33px;
    font-size: 13px;
  }

  .nav-cta {
    display: none;
  }

  .main-nav {
    top: 70px;
    padding: 14px 16px 22px;
  }

  .page-hero-inner {
    padding: 42px 0 36px;
  }

  .page-hero h1 {
    font-size: 36px;
  }

  .hero-sub {
    font-size: 15px;
  }

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

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

  .breadcrumb {
    margin-bottom: 24px;
  }

  .doc-article {
    padding-top: 18px;
  }

  .doc-section h2 {
    font-size: 21px;
  }

  .doc-section {
    margin-bottom: 36px;
  }

  .catalog-grid,
  .security-grid {
    grid-template-columns: 1fr;
  }

  .field-row {
    grid-template-columns: 1fr;
  }

  .contact-card {
    grid-template-columns: 1fr;
    padding: 26px 22px;
  }

  .contact-zone {
    padding: 56px 0;
  }

  .contact-copy h2 {
    font-size: 24px;
  }

  .contact-form-panel {
    padding: 20px;
  }

  .footer-main {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .site-footer {
    padding: 52px 0 28px;
  }

  .footer-bottom {
    margin-top: 36px;
  }
}

@media (max-width: 520px) {
  .home-map-list li {
    padding-left: 44px;
  }

  .doc-figure img {
    aspect-ratio: 4 / 3;
  }

  .contact-form-panel {
    padding: 18px;
  }

  .btn {
    height: 46px;
  }
}

/* roulang page: category2 */
:root{
  --bg:#060B18;
  --bg-soft:#0A1322;
  --bg-deep:#04080F;
  --plate:#0E1729;
  --plate-light:#121D33;
  --glass:rgba(255,255,255,0.055);
  --glass-border:rgba(168,204,255,0.16);
  --line:rgba(150,190,240,0.14);
  --line-soft:rgba(150,190,240,0.08);
  --primary:#3DBBFF;
  --primary-light:#7ED6FF;
  --primary-weak:rgba(61,187,255,0.14);
  --accent:#FFC567;
  --success:#2BE0A6;
  --danger:#FF6B8B;
  --text:#E8F1FC;
  --text-secondary:#A9BDD8;
  --text-muted:#7189A8;
  --radius-sm:8px;
  --radius-md:16px;
  --radius-lg:24px;
  --shadow-card:0 12px 32px rgba(0,6,20,0.28);
  --shadow-hover:0 18px 48px rgba(2,24,60,0.4);
  --max-width:1180px;
  --space-section:104px;
  --font-main:"PingFang SC","Microsoft YaHei","Noto Sans SC","Helvetica Neue",Arial,sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-main);
  font-size:16px;
  line-height:1.78;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  z-index:-1;
  background-image:
    linear-gradient(rgba(120,170,255,0.04) 1px,transparent 1px),
    linear-gradient(90deg,rgba(120,170,255,0.035) 1px,transparent 1px);
  background-size:92px 92px;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none;transition:color .2s ease,border-color .2s ease,background-color .2s ease}
ul,ol{list-style:none;margin:0;padding:0}
h1,h2,h3,h4,p{margin-top:0}
h1,h2,h3{line-height:1.3;letter-spacing:.01em}
h1,h2,h3,h4{color:var(--text)}
button,input,textarea{font-family:inherit;font-size:1rem}
:focus-visible{
  outline:2px solid var(--primary);
  outline-offset:3px;
  border-radius:4px;
}
.container{
  max-width:var(--max-width);
  margin:0 auto;
  padding-left:20px;
  padding-right:20px;
}
.section{
  padding-top:var(--space-section);
  padding-bottom:var(--space-section);
  position:relative;
}
.section-alt-back{
  background:var(--bg-soft);
  border-top:1px solid var(--line-soft);
  border-bottom:1px solid var(--line-soft);
}
/* Buttons */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border:1px solid transparent;
  border-radius:10px;
  padding:10px 22px;
  min-height:42px;
  font-weight:600;
  cursor:pointer;
  transition:background-color .2s ease,border-color .2s ease,box-shadow .2s ease,transform .2s ease;
  white-space:nowrap;
}
.btn-primary{
  background:var(--primary);
  color:#061523;
}
.btn-primary:hover{
  background:var(--primary-light);
  box-shadow:0 0 18px rgba(61,187,255,0.35);
  color:#061523;
}
.btn-primary:active{transform:translateY(1px)}
.btn-outline{
  background:rgba(255,255,255,0.03);
  border-color:rgba(61,187,255,0.7);
  color:var(--primary);
}
.btn-outline:hover{
  border-color:var(--primary-light);
  background:var(--primary-weak);
  color:var(--primary-light);
}
.btn-outline:active{transform:translateY(1px)}
/* Header */
.site-header{
  position:sticky;
  top:0;
  z-index:100;
  min-height:80px;
  background:rgba(6,11,24,0.82);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid var(--line);
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:28px;
  min-height:80px;
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex-shrink:0;
}
.brand-mark{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:38px;
  height:38px;
  border-radius:10px;
  background:linear-gradient(145deg,rgba(61,187,255,0.24),rgba(61,187,255,0.08));
  border:1px solid rgba(61,187,255,0.5);
  color:#fff;
  font-weight:700;
  letter-spacing:0;
  font-size:15px;
  box-shadow:0 0 12px rgba(61,187,255,0.18);
}
.brand-name{
  font-size:19px;
  font-weight:700;
  color:var(--text);
  letter-spacing:.02em;
}
.brand-name small{
  display:block;
  font-size:12px;
  font-weight:400;
  color:var(--primary);
  letter-spacing:.08em;
  line-height:1.2;
}
.main-nav{
  margin-left:auto;
}
.main-nav ul{
  display:flex;
  align-items:center;
  gap:6px;
}
.nav-link{
  display:inline-block;
  padding:10px 14px;
  border-radius:8px;
  color:var(--text-secondary);
  font-weight:500;
  position:relative;
  transition:color .2s ease,background-color .2s ease;
}
.nav-link::after{
  content:"";
  position:absolute;
  left:14px;
  right:14px;
  bottom:2px;
  height:2px;
  border-radius:2px;
  background:var(--primary);
  transform:scaleX(0);
  transform-origin:center;
  transition:transform .2s ease;
}
.nav-link:hover{
  color:var(--primary-light);
  background:rgba(61,187,255,0.05);
}
.nav-link.active{
  color:var(--primary-light);
  background:rgba(61,187,255,0.08);
}
.nav-link.active::after{
  transform:scaleX(1);
}
.nav-cta{
  margin-left:8px;
  flex-shrink:0;
}
.burger{
  display:none;
  width:44px;
  height:44px;
  border:1px solid rgba(150,190,240,0.2);
  border-radius:10px;
  background:rgba(255,255,255,0.04);
  cursor:pointer;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:5px;
}
.burger span{
  display:block;
  width:20px;
  height:2px;
  background:var(--text-secondary);
  border-radius:2px;
  transition:transform .25s ease,opacity .25s ease;
}
/* Hero compact */
.hero-compact{
  padding:78px 0 72px;
  position:relative;
  background:
    linear-gradient(90deg,rgba(6,11,24,0.94) 0%,rgba(6,11,24,0.86) 52%,rgba(6,11,24,0.78) 100%),
    url('/assets/images/backpic/back-2.webp') no-repeat center 40% / cover;
  border-bottom:1px solid var(--line);
}
.hero-grid{
  display:grid;
  grid-template-columns:1.12fr .88fr;
  gap:56px;
  align-items:center;
}
.breadcrumb{
  display:flex;
  align-items:center;
  gap:10px;
  font-size:14px;
  color:var(--text-muted);
  margin-bottom:18px;
  flex-wrap:wrap;
}
.breadcrumb a{color:var(--text-muted)}
.breadcrumb a:hover{color:var(--primary-light)}
.breadcrumb-sep{color:rgba(150,190,240,0.28)}
.hero-title{
  font-size:52px;
  font-weight:800;
  margin:0 0 16px;
  letter-spacing:.01em;
  line-height:1.18;
}
.hero-sub{
  font-size:17px;
  color:var(--text-secondary);
  max-width:580px;
  margin:0 0 28px;
}
.hero-actions{
  display:flex;
  flex-wrap:wrap;
  gap:14px;
  margin-bottom:24px;
}
.hero-check{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  padding-top:12px;
}
.hero-check span{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-size:13px;
  color:var(--text-muted);
}
.hero-check span::before{
  content:"";
  width:5px;
  height:5px;
  border-radius:50%;
  background:var(--success);
  box-shadow:0 0 8px rgba(43,224,166,0.6);
}
.hero-panel{
  background:var(--glass);
  border:1px solid var(--glass-border);
  border-radius:var(--radius-lg);
  padding:28px;
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  box-shadow:var(--shadow-card);
  position:relative;
}
.hero-panel::before{
  content:"";
  position:absolute;
  top:18px;
  right:-10px;
  width:50px;
  height:1px;
  background:linear-gradient(90deg,transparent,var(--primary-light));
}
.panel-top{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  margin-bottom:24px;
}
.panel-label{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:14px;
  font-weight:600;
  color:var(--primary-light);
}
.panel-status{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-size:13px;
  color:var(--text-secondary);
  background:rgba(43,224,166,0.1);
  border:1px solid rgba(43,224,166,0.2);
  padding:4px 10px;
  border-radius:999px;
}
.panel-status::before{
  content:"";
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--success);
  box-shadow:0 0 8px rgba(43,224,166,0.8);
}
.check-list{
  display:flex;
  flex-direction:column;
  gap:16px;
}
.check-list li{
  display:flex;
  gap:12px;
  align-items:flex-start;
  font-size:15px;
  color:var(--text-secondary);
  line-height:1.65;
}
.check-list li::before{
  content:"✓";
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:20px;
  height:20px;
  border-radius:50%;
  border:1px solid rgba(43,224,166,0.4);
  color:var(--success);
  font-size:13px;
  flex-shrink:0;
  margin-top:3px;
  background:rgba(43,224,166,0.06);
}
/* Section headers */
.section-head{
  max-width:760px;
  margin-bottom:52px;
}
.section-head.centered{
  margin-left:auto;
  margin-right:auto;
  text-align:center;
}
.section-kicker{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:14px;
  letter-spacing:.12em;
  color:var(--primary);
  font-weight:600;
  margin-bottom:12px;
}
.section-kicker::before{
  content:"";
  width:26px;
  height:1px;
  background:linear-gradient(90deg,transparent,var(--primary));
}
.section-head.centered .section-kicker::before{
  display:none;
}
.section-title{
  font-size:38px;
  font-weight:800;
  margin:0 0 14px;
  letter-spacing:.01em;
}
.section-description{
  font-size:16px;
  color:var(--text-secondary);
  margin:0;
}
.section-title .light{
  color:var(--primary-light);
}
/* Steps flow */
.steps-section{
  position:relative;
  overflow:hidden;
}
.steps-grid{
  position:relative;
  margin-top:20px;
}
.steps-grid::before{
  content:"";
  position:absolute;
  left:50%;
  top:90px;
  bottom:90px;
  width:1px;
  background:linear-gradient(180deg,var(--primary),rgba(61,187,255,0.06));
  transform:translateX(-50%);
  opacity:.5;
}
.step-item{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:48px 58px;
  align-items:center;
  padding:34px 0;
  position:relative;
}
.step-item:nth-child(odd) .step-visual{
  order:2;
}
.step-item:nth-child(even) .step-info{
  order:2;
}
.step-info{
  padding:24px;
  background:var(--plate);
  border:1px solid var(--line);
  border-radius:var(--radius-md);
  box-shadow:var(--shadow-card);
  transition:border-color .25s ease,box-shadow .25s ease;
}
.step-info:hover{
  border-color:rgba(61,187,255,0.35);
  box-shadow:var(--shadow-hover);
}
.step-meta{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:13px;
  color:var(--primary-light);
  background:var(--primary-weak);
  border:1px solid rgba(61,187,255,0.2);
  padding:5px 12px;
  border-radius:999px;
  margin-bottom:18px;
  letter-spacing:.05em;
}
.step-meta::before{
  content:"";
  width:7px;
  height:7px;
  border-radius:50%;
  background:var(--primary);
  box-shadow:0 0 8px rgba(61,187,255,0.7);
}
.step-info h3{
  font-size:24px;
  margin-bottom:14px;
  font-weight:700;
}
.step-info p{
  color:var(--text-secondary);
  font-size:15px;
  line-height:1.9;
  margin-bottom:14px;
}
.step-info p:last-child{
  margin-bottom:0;
}
.step-visual{
  border-radius:var(--radius-lg);
  overflow:hidden;
  border:1px solid var(--line);
  background:var(--plate);
  box-shadow:var(--shadow-card);
  position:relative;
}
.step-visual img{
  width:100%;
  aspect-ratio:16 / 11;
  object-fit:cover;
  opacity:.92;
  transition:transform .4s ease,opacity .4s ease;
}
.step-visual:hover img{
  transform:scale(1.02);
  opacity:1;
}
.step-code{
  position:absolute;
  left:18px;
  top:18px;
  background:rgba(6,11,24,0.72);
  border:1px solid rgba(61,187,255,0.4);
  color:#fff;
  font-size:15px;
  font-weight:600;
  line-height:1;
  padding:10px 16px;
  border-radius:12px;
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
}
.step-caption{
  padding:12px 16px;
  margin:0;
  font-size:13px;
  color:var(--text-muted);
  border-top:1px solid var(--line);
  background:rgba(6,11,24,0.45);
  text-align:center;
}
/* Info note */
.note-panel{
  background:var(--bg-soft);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  padding:36px;
  display:grid;
  grid-template-columns:1fr 1.4fr;
  gap:32px;
  position:relative;
  overflow:hidden;
}
.note-panel::after{
  content:"";
  position:absolute;
  width:260px;
  height:260px;
  top:-180px;
  right:-80px;
  background:radial-gradient(circle,rgba(61,187,255,0.13),transparent 70%);
  pointer-events:none;
}
.note-panel h3{
  margin:0 0 12px;
  font-size:22px;
}
.note-panel p{
  color:var(--text-secondary);
  margin:0;
  font-size:15px;
}
.note-list-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:24px;
  margin-top:48px;
}
.note-mini{
  border-left:2px solid var(--primary);
  background:rgba(61,187,255,0.04);
  border-radius:0 14px 14px 0;
  padding:22px 24px;
}
.note-mini h4{
  font-size:17px;
  margin-bottom:8px;
  color:var(--primary-light);
}
.note-mini p{
  font-size:15px;
  color:var(--text-secondary);
  margin:0;
}
/* FAQ */
.faq-wrap{
  max-width:860px;
  margin:0 auto;
}
.faq-list{
  margin-top:8px;
  border-top:1px solid var(--line);
}
.faq-item{
  border-bottom:1px solid var(--line);
  background:rgba(14,23,41,0.4);
  transition:background-color .3s ease;
}
.faq-item[open]{
  background:rgba(14,23,41,0.72);
}
.faq-item summary{
  list-style:none;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  padding:22px 8px;
  cursor:pointer;
  font-size:18px;
  font-weight:600;
  line-height:1.5;
  transition:color .2s ease;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary:hover{
  color:var(--primary-light);
}
.faq-item .marker{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:28px;
  height:28px;
  border-radius:50%;
  border:1px solid rgba(61,187,255,0.4);
  color:var(--primary);
  font-size:20px;
  font-weight:400;
  flex-shrink:0;
  transition:transform .25s ease,color .25s ease,border-color .25s ease,background-color .25s ease;
}
.faq-item[open] .marker{
  transform:rotate(45deg);
  background:var(--primary);
  color:#061523;
  border-color:var(--primary);
}
.faq-answer{
  padding:0 28px 24px;
  color:var(--text-secondary);
  font-size:15px;
  line-height:1.9;
}
.faq-answer p{
  margin:0 0 12px;
}
.faq-answer p:last-child{
  margin-bottom:0;
}
.faq-answer ul{
  list-style:disc;
  padding-left:20px;
  margin-top:6px;
}
.faq-answer li{
  margin-bottom:4px;
}
/* CTA / Contact module */
.cta-section{
  background:var(--bg-soft);
  border-top:1px solid var(--line);
}
.cta-panel{
  display:grid;
  grid-template-columns:0.9fr 1.1fr;
  border-radius:var(--radius-lg);
  overflow:hidden;
  border:1px solid var(--line);
  background:
    linear-gradient(135deg,rgba(61,187,255,0.08) 0%,rgba(6,11,24,0.6) 50%),
    url('/assets/images/coverpic/cover-2.webp') no-repeat right 10% / cover;
  position:relative;
  box-shadow:var(--shadow-card);
}
.cta-context{
  padding:48px 44px;
  background:rgba(6,11,24,0.8);
}
.cta-context h2{
  font-size:32px;
  margin-bottom:16px;
  line-height:1.3;
}
.cta-context p{
  color:var(--text-secondary);
  font-size:15px;
  line-height:1.9;
  margin-bottom:16px;
}
.cta-note{
  display:flex;
  align-items:center;
  gap:8px;
  color:var(--text-muted);
  font-size:14px;
  margin-top:12px;
}
.cta-note::before{
  content:"";
  width:8px;
  height:8px;
  border-radius:50%;
  background:var(--accent);
  box-shadow:0 0 10px rgba(255,197,103,0.4);
}
.contact-form{
  padding:48px 44px;
  background:rgba(8,15,28,0.72);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
}
.form-field{
  margin-bottom:20px;
}
.form-field label{
  display:block;
  font-size:14px;
  color:var(--text-secondary);
  margin-bottom:8px;
}
.form-field input,
.form-field textarea{
  width:100%;
  background:rgba(6,11,24,0.72);
  border:1px solid var(--line);
  border-radius:12px;
  color:var(--text);
  padding:13px 16px;
  min-height:48px;
  font-size:15px;
  line-height:1.6;
  transition:border-color .2s ease,box-shadow .2s ease,background-color .2s ease;
}
.form-field textarea{
  min-height:116px;
  resize:vertical;
}
.form-field input:focus,
.form-field textarea:focus{
  outline:none;
  border-color:var(--primary);
  box-shadow:0 0 0 3px rgba(61,187,255,0.16);
  background:rgba(6,11,24,0.86);
}
.form-hint{
  font-size:13px;
  color:var(--text-muted);
  margin-top:8px;
}
.form-status{
  display:none;
  align-items:flex-start;
  gap:8px;
  font-size:15px;
  border-radius:10px;
  padding:12px 16px;
  margin-bottom:18px;
}
.form-status.form-success{
  display:flex;
  color:var(--success);
  background:rgba(43,224,166,0.08);
  border:1px solid rgba(43,224,166,0.25);
}
.form-status.form-error{
  display:flex;
  color:var(--danger);
  background:rgba(255,107,139,0.08);
  border:1px solid rgba(255,107,139,0.3);
}
/* Footer */
.site-footer{
  background:#050A15;
  border-top:1px solid var(--line);
  padding-top:64px;
}
.footer-main{
  display:grid;
  grid-template-columns:1.7fr 1fr 1fr;
  gap:56px 44px;
  padding-bottom:46px;
}
.footer-brand-name{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-size:20px;
  font-weight:700;
  color:var(--text);
  margin-bottom:14px;
}
.footer-tagline{
  color:var(--text-muted);
  font-size:15px;
  max-width:360px;
  margin:0;
  line-height:1.9;
}
.footer-title{
  font-size:16px;
  font-weight:700;
  color:var(--text);
  margin-bottom:16px;
}
.footer-links{
  display:flex;
  flex-direction:column;
  gap:10px;
}
.footer-links a,
.footer-links li{
  color:var(--text-muted);
  font-size:15px;
  transition:color .2s ease;
}
.footer-links a:hover{
  color:var(--primary-light);
}
.footer-bottom{
  border-top:1px solid var(--line-soft);
  padding:20px 0;
  text-align:center;
  color:var(--text-muted);
  font-size:14px;
}
/* Responsive */
@media (max-width:1100px){
  .header-inner{gap:18px}
  .nav-link{
    padding:9px 10px;
    font-size:15px;
  }
}
@media (max-width:991px){}
@media (max-width:860px){
  :root{
    --space-section:78px;
  }
  .main-nav{
    position:fixed;
    top:80px;
    left:12px;
    right:12px;
    background:rgba(6,11,24,0.96);
    border:1px solid var(--line);
    border-radius:18px;
    padding:22px;
    opacity:0;
    visibility:hidden;
    transform:translateY(-12px);
    transition:opacity .25s ease,transform .25s ease,visibility .25s ease;
    backdrop-filter:blur(18px);
    -webkit-backdrop-filter:blur(18px);
    z-index:99;
    box-shadow:0 28px 60px rgba(0,0,0,0.4);
  }
  body.nav-open .main-nav{
    opacity:1;
    visibility:visible;
    transform:translateY(0);
  }
  .main-nav ul{
    flex-direction:column;
    align-items:stretch;
    gap:4px;
  }
  .nav-link{
    display:block;
    padding:14px 16px;
    font-size:17px;
  }
  .nav-link::after{
    display:none;
  }
  .nav-link.active{
    background:var(--primary-weak);
    color:var(--primary-light);
  }
  .nav-cta{
    display:none;
  }
  .burger{
    display:inline-flex;
  }
  .nav-cta-mobile{
    display:inline-flex;
    margin-top:16px;
    width:100%;
    justify-content:center;
  }
  .hero-grid{
    grid-template-columns:1fr;
    gap:42px;
  }
  .hero-title{
    font-size:38px;
  }
  .hero-panel{
    max-width:620px;
  }
  .section-title{
    font-size:30px;
  }
  .note-panel{
    grid-template-columns:1fr;
  }
  .note-list-grid{
    grid-template-columns:1fr;
  }
  .cta-panel{
    grid-template-columns:1fr;
  }
  .cta-context,
  .contact-form{
    padding:36px 28px;
  }
  .step-item{
    grid-template-columns:1fr;
    gap:26px;
    padding:20px 0;
  }
  .step-item:nth-child(odd) .step-visual{
    order:0;
  }
  .step-item:nth-child(even) .step-info{
    order:0;
  }
  .steps-grid::before{
    left:28px;
    right:auto;
    top:auto;
    bottom:40px;
    width:1px;
    height:auto;
    transform:none;
    opacity:.3;
  }
  .step-info{
    padding:20px;
  }
  .footer-main{
    grid-template-columns:1fr 1fr;
    gap:34px 32px;
  }
}
@media (max-width:767px){
  .container{
    padding-left:16px;
    padding-right:16px;
  }
  .section-title{
    font-size:26px;
  }
  .faq-item .marker{
    width:24px;
    height:24px;
    font-size:16px;
  }
}
@media (max-width:540px){
  .brand-name{
    font-size:17px;
  }
  .brand-mark{
    width:34px;
    height:34px;
    font-size:14px;
  }
  .hero-title{
    font-size:30px;
  }
  .section-head{
    margin-bottom:34px;
  }
  .section{
    --space-section:64px;
  }
  .hero-compact{
    padding:50px 0;
  }
  .note-panel,
  .cta-context,
  .contact-form{
    padding:26px 20px;
  }
  .step-code{
    left:10px;
    top:10px;
    font-size:13px;
    padding:8px 12px;
  }
  .footer-main{
    grid-template-columns:1fr;
  }
  .cta-panel{
    border-radius:18px;
  }
  .form-field input,
  .form-field textarea{
    min-height:44px;
    padding:10px 13px;
  }
}

/* roulang page: category3 */
:root{
  --page-bg:#060B18;
  --panel-bg:#0A1322;
  --card-bg:#0E1729;
  --card-soft:#111C31;
  --glass-bg:rgba(255,255,255,.055);
  --glass-border:rgba(168,204,255,.16);
  --line:rgba(150,190,240,.14);
  --line-light:rgba(168,204,255,.26);
  --primary:#3DBBFF;
  --primary-light:#7ED6FF;
  --accent:#FFC567;
  --success:#2BE0A6;
  --danger:#FF6B8B;
  --text-strong:#E8F1FC;
  --text:#A9BDD8;
  --text-muted:#7189A8;
  --dark-ink:#061523;
  --radius-sm:10px;
  --radius-md:16px;
  --radius-lg:24px;
  --shadow:0 12px 32px rgba(0,6,20,.28);
  --shadow-hover:0 18px 48px rgba(2,24,60,.4);
  --max-width:1180px;
  --font-stack:PingFang SC,Microsoft YaHei,Noto Sans SC,sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  background:var(--page-bg);
  color:var(--text);
  font-family:var(--font-stack);
  font-size:16px;
  line-height:1.8;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  background-image:linear-gradient(rgba(120,170,230,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(120,170,230,.025) 1px,transparent 1px);
  background-size:56px 56px;
  pointer-events:none;
  z-index:0;
}
body > *{position:relative;z-index:1}
img{max-width:100%;height:auto;vertical-align:middle}
a{color:inherit;text-decoration:none;transition:color .2s ease,border-color .2s ease,background .2s ease}
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible{
  outline:2px solid var(--primary);
  outline-offset:3px;
}
button{font-family:inherit}
svg{display:block}
.container{
  width:min(1180px,92vw);
  margin-inline:auto;
}
.section{
  padding:100px 0;
  position:relative;
}
.section-soft{
  background:rgba(218,236,255,.02);
}
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:9px;
  height:48px;
  padding:0 26px;
  border-radius:var(--radius-sm);
  border:1px solid transparent;
  font-weight:600;
  font-size:15px;
  line-height:1;
  cursor:pointer;
  transition:transform .2s ease,box-shadow .2s ease,background .2s ease,border-color .2s ease,color .2s ease;
  white-space:nowrap;
}
.btn:active{transform:translateY(1px)}
.btn-primary{
  background:var(--primary);
  color:var(--dark-ink);
  box-shadow:0 0 0 rgba(61,187,255,0);
}
.btn-primary:hover{
  background:var(--primary-light);
  box-shadow:0 0 18px rgba(61,187,255,.35);
  transform:translateY(-1px);
  color:#051120;
}
.btn-primary:active{
  transform:translateY(1px);
}
.btn-secondary{
  background:rgba(255,255,255,.035);
  border-color:rgba(61,187,255,.48);
  color:var(--primary);
}
.btn-secondary:hover{
  border-color:var(--primary-light);
  background:rgba(61,187,255,.08);
  color:#BFE8FF;
}
.arrow-link{
  display:inline-flex;
  align-items:center;
  gap:7px;
  font-weight:600;
  font-size:15px;
  color:var(--primary);
}
.arrow-link:hover{
  color:var(--primary-light);
}
.arrow-link svg{
  width:16px;
  height:16px;
  transition:transform .2s;
}
.arrow-link:hover svg{
  transform:translateX(4px);
}

/* header */
.site-header{
  position:sticky;
  top:0;
  z-index:50;
  background:rgba(5,9,20,.84);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid rgba(150,190,240,.12);
}
.header-inner{
  height:78px;
  display:flex;
  align-items:center;
  gap:18px;
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin-right:auto;
  min-width:0;
}
.brand-mark{
  width:40px;
  height:40px;
  border-radius:11px;
  background:linear-gradient(135deg,rgba(61,187,255,.25),rgba(61,187,255,.06));
  border:1px solid rgba(61,187,255,.4);
  color:var(--primary-light);
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight:800;
  font-size:15px;
  line-height:1;
  letter-spacing:.04em;
  flex:0 0 auto;
}
.brand-name{
  color:var(--text-strong);
  font-weight:800;
  font-size:20px;
  line-height:1.1;
  letter-spacing:.02em;
}
.brand-name small{
  display:block;
  font-size:11px;
  font-weight:600;
  color:var(--text-muted);
  letter-spacing:.14em;
  margin-top:3px;
}
.main-nav{margin-left:6px}
.main-nav ul{
  list-style:none;
  display:flex;
  align-items:center;
  gap:2px;
}
.nav-link{
  display:inline-block;
  padding:10px 16px;
  border-radius:8px;
  color:var(--text);
  font-size:15px;
  font-weight:600;
  transition:background .2s ease,color .2s ease;
}
.nav-link:hover{
  color:var(--primary-light);
  background:rgba(61,187,255,.06);
}
.nav-link.active{
  color:var(--primary-light);
  background:rgba(61,187,255,.08);
  box-shadow:inset 0 -2px 0 var(--primary);
}
.nav-cta{
  height:44px;
  padding:0 24px;
  font-size:15px;
}
.burger{
  display:none;
  width:44px;
  height:44px;
  border:1px solid var(--line);
  border-radius:10px;
  background:rgba(255,255,255,.03);
  cursor:pointer;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:5px;
}
.burger span{
  display:block;
  width:20px;
  height:2px;
  border-radius:2px;
  background:var(--text-strong);
  transition:transform .25s ease,opacity .2s ease;
}
.burger.open span:nth-child(1){
  transform:translateY(7px) rotate(45deg);
}
.burger.open span:nth-child(2){
  opacity:0;
}
.burger.open span:nth-child(3){
  transform:translateY(-7px) rotate(-45deg);
}
.mobile-menu{
  display:none;
}

/* page hero */
.page-hero{
  padding:70px 0 86px;
  background:
    linear-gradient(95deg,rgba(6,11,24,.98) 20%,rgba(6,11,24,.86) 52%,rgba(8,16,31,.72)),
    url("/assets/images/backpic/back-1.webp") center/cover no-repeat;
  border-bottom:1px solid var(--line);
}
.crumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  font-size:14px;
  color:var(--text-muted);
  margin-bottom:32px;
}
.crumb a{
  color:var(--text);
  transition:color .2s;
}
.crumb a:hover{
  color:var(--primary-light);
}
.crumb i{
  font-style:normal;
  opacity:.52;
}
.crumb span{
  color:var(--primary-light);
}
.hero-content{
  max-width:860px;
}
.hero-content h1{
  color:var(--text-strong);
  font-size:44px;
  font-weight:800;
  line-height:1.25;
  letter-spacing:.02em;
  margin-bottom:24px;
}
.hero-content .lead{
  font-size:18px;
  line-height:1.85;
  color:var(--text);
  max-width:720px;
  margin-bottom:32px;
}
.hero-actions{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:14px;
  margin-bottom:34px;
}
.hero-badges{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
}
.hero-badges span{
  display:inline-block;
  padding:6px 15px;
  border-radius:999px;
  background:rgba(255,255,255,.04);
  border:1px solid rgba(168,204,255,.17);
  color:var(--text);
  font-size:13px;
}
.hero-badges span::before{
  content:"";
  display:inline-block;
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--success);
  margin-right:8px;
  vertical-align:1px;
  box-shadow:0 0 8px rgba(43,224,166,.55);
}

/* section heading */
.section-head{
  max-width:820px;
  margin-bottom:50px;
}
.section-kicker{
  display:inline-block;
  font-size:13px;
  font-weight:700;
  letter-spacing:.18em;
  color:var(--primary);
  text-transform:uppercase;
  margin-bottom:14px;
  padding-left:16px;
  position:relative;
}
.section-kicker::before{
  content:"";
  position:absolute;
  left:0;
  top:50%;
  transform:translateY(-50%);
  width:7px;
  height:7px;
  border-radius:2px;
  background:var(--primary);
  box-shadow:0 0 10px rgba(61,187,255,.45);
}
.section-head h2{
  color:var(--text-strong);
  font-size:32px;
  font-weight:800;
  line-height:1.35;
  margin-bottom:18px;
  letter-spacing:.01em;
}
.section-head p{
  color:var(--text);
  font-size:17px;
  line-height:1.85;
}

/* feature overview */
.overview-section{
  padding-top:100px;
  padding-bottom:90px;
}
.overview-grid{
  display:grid;
  grid-template-columns:repeat(12,1fr);
  gap:24px;
}
.feature-large{
  grid-column:span 7;
  background:var(--card-bg);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow);
  display:grid;
  grid-template-columns:1.08fr .92fr;
  overflow:hidden;
  transition:border-color .25s ease,box-shadow .25s ease;
}
.feature-large:hover{
  border-color:rgba(61,187,255,.28);
  box-shadow:var(--shadow-hover);
}
.feature-large-content{
  padding:38px 34px 36px;
}
.feature-large .feature-photo{
  position:relative;
  min-height:230px;
}
.feature-large .feature-photo img{
  width:100%;
  height:100%;
  object-fit:cover;
  position:absolute;
  inset:0;
}
.feature-large .photo-note{
  position:absolute;
  left:14px;
  bottom:14px;
  font-size:12px;
  color:#d5e4f7;
  background:rgba(5,9,20,.74);
  padding:4px 12px;
  border-radius:8px;
  border:1px solid rgba(168,204,255,.16);
  backdrop-filter:blur(6px);
}
.feature-pair{
  grid-column:span 5;
  display:grid;
  grid-template-rows:1fr 1fr;
  gap:24px;
}
.feature-card{
  background:var(--card-bg);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow);
  padding:30px 30px 28px;
  transition:border-color .25s ease,box-shadow .25s ease,transform .2s ease;
}
.feature-card:hover{
  border-color:rgba(61,187,255,.3);
  box-shadow:var(--shadow-hover);
  transform:translateY(-2px);
}
.icon-tile{
  width:44px;
  height:44px;
  border-radius:12px;
  background:rgba(61,187,255,.09);
  border:1px solid rgba(61,187,255,.22);
  color:var(--primary-light);
  font-size:18px;
  font-weight:800;
  display:flex;
  align-items:center;
  justify-content:center;
  margin-bottom:20px;
}
.feature-large-content h3,
.feature-card h3{
  color:var(--text-strong);
  font-size:20px;
  font-weight:700;
  margin-bottom:12px;
  line-height:1.45;
}
.feature-large-content p,
.feature-card p{
  color:var(--text);
  font-size:15px;
  line-height:1.8;
  margin-bottom:18px;
}
.check-list{
  list-style:none;
  display:grid;
  gap:10px;
}
.check-list li{
  position:relative;
  padding-left:24px;
  color:var(--text);
  font-size:14px;
  line-height:1.7;
}
.check-list li::before{
  content:"";
  position:absolute;
  left:0;
  top:10px;
  width:7px;
  height:7px;
  border-radius:50%;
  background:var(--primary);
  box-shadow:0 0 8px rgba(61,187,255,.3);
}
.mini-note{
  margin-top:17px;
  padding-top:16px;
  border-top:1px solid var(--line);
  color:var(--text-muted);
  font-size:13px;
  line-height:1.7;
}

/* compare */
.compare-section{
  background:
    radial-gradient(1200px 380px at 75% -10%,rgba(61,187,255,.06),transparent 65%),
    var(--panel-bg);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  padding:96px 0;
}
.compare-grid{
  display:grid;
  grid-template-columns:.88fr 1.12fr;
  gap:24px;
  align-items:stretch;
}
.compare-item{
  border-radius:var(--radius-lg);
  background:rgba(255,255,255,.025);
  border:1px solid var(--line);
  padding:38px 34px 34px;
  box-shadow:var(--shadow);
  transition:border-color .25s ease,transform .25s ease,box-shadow .25s ease;
}
.compare-item:hover{
  border-color:var(--line-light);
  box-shadow:var(--shadow-hover);
}
.compare-item--new{
  background:linear-gradient(180deg,rgba(61,187,255,.065),rgba(255,255,255,.025) 38%);
  border-color:rgba(61,187,255,.32);
  position:relative;
  overflow:hidden;
}
.compare-item--new::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:2px;
  background:linear-gradient(90deg,var(--primary),rgba(61,187,255,0));
}
.compare-badge{
  display:inline-block;
  background:var(--primary);
  color:var(--dark-ink);
  font-size:12px;
  font-weight:800;
  padding:5px 13px;
  border-radius:999px;
  margin-bottom:18px;
  letter-spacing:.05em;
}
.compare-item .section-alias{
  display:inline-block;
  font-size:12px;
  font-weight:700;
  letter-spacing:.12em;
  color:var(--text-muted);
  margin-bottom:22px;
}
.compare-item h3{
  color:var(--text-strong);
  font-size:22px;
  font-weight:800;
  margin-bottom:13px;
  line-height:1.4;
}
.compare-item .compare-desc{
  font-size:15px;
  line-height:1.85;
  color:var(--text);
  margin-bottom:20px;
}
.compare-item ul{
  list-style:none;
  display:grid;
  gap:12px;
  margin-bottom:10px;
}
.compare-item ul li{
  position:relative;
  padding-left:26px;
  font-size:14px;
  line-height:1.75;
  color:var(--text);
}
.compare-item ul li::before{
  content:"";
  position:absolute;
  left:2px;
  top:11px;
  width:7px;
  height:7px;
  border-radius:50%;
  border:1px solid var(--primary);
  background:rgba(61,187,255,.12);
}
.compare-item ul li::after{
  content:"";
  position:absolute;
  left:8px;
  top:17px;
  width:5px;
  height:1px;
  background:rgba(61,187,255,.3);
  transform:rotate(45deg);
  transform-origin:left center;
}
.compare-result{
  margin-top:20px;
  padding-top:18px;
  border-top:1px solid var(--line);
  color:var(--text-muted);
  font-size:14px;
  line-height:1.7;
}
.compare-item--new .compare-result{
  color:var(--text);
}
.compare-item--new .arrow-link{
  margin-top:10px;
}

/* scene section */
.scene-section{
  padding:96px 0 90px;
}
.scene-wrap{
  display:grid;
  gap:18px;
}
.scene-item{
  position:relative;
  background:rgba(255,255,255,.025);
  border:1px solid rgba(150,190,240,.13);
  border-radius:var(--radius-md);
  padding:30px 34px;
  display:grid;
  grid-template-columns:170px 1fr auto;
  align-items:center;
  gap:28px;
  transition:background .25s ease,border-color .25s ease,box-shadow .25s ease;
}
.scene-item:hover{
  background:rgba(61,187,255,.045);
  border-color:rgba(61,187,255,.25);
  box-shadow:0 14px 34px rgba(0,6,20,.2);
}
.scene-index{
  font-size:15px;
  font-weight:700;
  letter-spacing:.15em;
  color:var(--text-muted);
  padding-left:18px;
  position:relative;
}
.scene-index::before{
  content:"";
  position:absolute;
  left:0;
  top:50%;
  transform:translateY(-50%);
  width:2px;
  height:28px;
  background:var(--primary);
  box-shadow:0 0 10px rgba(61,187,255,.35);
  border-radius:2px;
}
.scene-copy h3{
  color:var(--text-strong);
  font-size:19px;
  font-weight:700;
  margin-bottom:7px;
}
.scene-copy p{
  font-size:14px;
  line-height:1.8;
  color:var(--text);
}
.scene-link{
  font-weight:600;
  color:var(--primary);
  font-size:14px;
  white-space:nowrap;
}
.scene-link:hover{
  color:var(--primary-light);
}

/* faq */
.faq-section{
  padding:96px 0 0;
}
.section-head--center{
  margin-inline:auto;
  text-align:center;
}
.section-head--center .section-kicker{
  padding-left:0;
}
.section-head--center .section-kicker::before{
  display:none;
}
.faq-container{
  max-width:860px;
  margin:0 auto 0;
}
.faq-item{
  border-bottom:1px solid var(--line);
}
.faq-item:first-child{
  border-top:1px solid var(--line);
}
.faq-question{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  background:transparent;
  border:none;
  padding:24px 2px;
  font-size:17px;
  color:var(--text-strong);
  font-weight:700;
  text-align:left;
  cursor:pointer;
  transition:color .2s ease;
}
.faq-question:hover{
  color:var(--primary-light);
}
.faq-icon{
  flex:0 0 auto;
  width:24px;
  height:24px;
  border-radius:50%;
  border:1px solid rgba(61,187,255,.35);
  color:var(--primary);
  display:flex;
  align-items:center;
  justify-content:center;
  transition:transform .25s ease,background .25s ease,border-color .25s ease;
  position:relative;
}
.faq-icon::before,
.faq-icon::after{
  content:"";
  position:absolute;
  background:currentColor;
}
.faq-icon::before{
  width:10px;
  height:2px;
}
.faq-icon::after{
  width:2px;
  height:10px;
  transition:opacity .2s ease;
}
.faq-item.open .faq-icon{
  transform:rotate(45deg);
  background:rgba(61,187,255,.08);
  border-color:rgba(61,187,255,.6);
}
.faq-item.open .faq-icon::after{
  opacity:0;
}
.faq-answer{
  display:grid;
  grid-template-rows:0fr;
  transition:grid-template-rows .28s ease;
}
.faq-answer > div{
  overflow:hidden;
}
.faq-item.open .faq-answer{
  grid-template-rows:1fr;
}
.faq-answer p{
  color:var(--text);
  font-size:15px;
  line-height:1.85;
  padding:0 38px 26px 2px;
}

/* contact CTA */
.cta-section{
  padding:100px 0;
}
.cta-wrap{
  background:
    linear-gradient(120deg,rgba(61,187,255,.07),transparent 42%),
    var(--card-bg);
  border:1px solid rgba(61,187,255,.2);
  border-radius:var(--radius-lg);
  box-shadow:0 16px 46px rgba(0,6,20,.36);
  display:grid;
  grid-template-columns:.86fr 1.14fr;
  overflow:hidden;
}
.cta-copy{
  padding:52px 48px 48px;
}
.cta-copy h2{
  color:var(--text-strong);
  font-size:28px;
  line-height:1.4;
  font-weight:800;
  margin-bottom:16px;
}
.cta-copy p{
  color:var(--text);
  font-size:15px;
  line-height:1.85;
  margin-bottom:24px;
}
.cta-list{
  list-style:none;
  display:grid;
  gap:12px;
}
.cta-list li{
  position:relative;
  padding-left:26px;
  color:var(--text);
  font-size:14px;
}
.cta-list li::before{
  content:url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="%233DBBFF" stroke-width="3"><polyline points="20 6 9 17 4 12"/></svg>');
  position:absolute;
  left:0;
  top:2px;
  width:14px;
  height:14px;
}
.contact-panel{
  background:rgba(6,11,24,.48);
  border-left:1px solid var(--line);
  padding:44px 40px 42px;
  display:flex;
  flex-direction:column;
}
.field{
  margin-bottom:20px;
}
.field label{
  display:block;
  font-size:14px;
  color:var(--text);
  font-weight:600;
  margin-bottom:8px;
}
.field input,
.field textarea{
  width:100%;
  border-radius:12px;
  border:1px solid var(--line);
  background:rgba(255,255,255,.04);
  color:var(--text-strong);
  padding:13px 16px;
  font-size:15px;
  font-family:inherit;
  transition:border-color .2s ease,box-shadow .2s ease,background .2s ease;
  resize:vertical;
}
.field input::placeholder,
.field textarea::placeholder{
  color:var(--text-muted);
}
.field input:focus,
.field textarea:focus{
  outline:none;
  border-color:var(--primary);
  box-shadow:0 0 0 3px rgba(61,187,255,.13);
  background:rgba(255,255,255,.05);
}
.form-error{
  display:none;
  margin-top:6px;
  font-size:13px;
  color:var(--danger);
}
.field.invalid .form-error{
  display:block;
}
.field.invalid input,
.field.invalid textarea{
  border-color:rgba(255,107,139,.75);
}
.form-feedback{
  display:none;
  align-items:center;
  gap:10px;
  border-radius:12px;
  background:rgba(43,224,166,.08);
  border:1px solid rgba(43,224,166,.28);
  color:#B9F5DE;
  padding:13px 16px;
  font-size:14px;
  margin-bottom:20px;
}
.form-feedback.danger{
  background:rgba(255,107,139,.08);
  border-color:rgba(255,107,139,.3);
  color:#FFD0DB;
}
.form-feedback.show{
  display:flex;
}
.form-feedback svg{
  flex:0 0 auto;
  width:18px;
  height:18px;
}
.contact-panel .btn{
  width:100%;
  margin-top:4px;
}

/* footer */
.site-footer{
  background:#050915;
  border-top:1px solid var(--line);
  padding-top:64px;
  padding-bottom:30px;
}
.footer-main{
  display:grid;
  grid-template-columns:1.5fr .8fr .8fr;
  gap:56px;
  padding-bottom:42px;
}
.footer-brand-name{
  display:flex;
  align-items:center;
  gap:9px;
  color:var(--text-strong);
  font-weight:800;
  font-size:18px;
  margin-bottom:16px;
}
.footer-tagline{
  color:var(--text-muted);
  font-size:14px;
  line-height:1.85;
  max-width:380px;
}
.footer-title{
  font-size:14px;
  font-weight:700;
  letter-spacing:.04em;
  color:var(--text-strong);
  margin-bottom:18px;
}
.footer-links{
  list-style:none;
  display:grid;
  gap:10px;
}
.footer-links a{
  color:var(--text-muted);
  font-size:14px;
  transition:color .2s ease;
}
.footer-links a:hover{
  color:var(--primary-light);
}
.footer-bottom{
  border-top:1px solid var(--line);
  padding-top:24px;
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:10px;
  color:var(--text-muted);
  font-size:13px;
}
@media (max-width:1100px){
  .navbar{
    gap:10px;
  }
  .nav-link{
    padding:10px 12px;
    font-size:14px;
  }
  .overview-grid{
    grid-template-columns:1fr 1fr;
  }
  .feature-large{
    grid-column:1/-1;
  }
  .feature-pair{
    grid-column:1/-1;
    grid-template-columns:1fr 1fr;
    grid-template-rows:none;
  }
  .compare-grid{
    grid-template-columns:1fr;
  }
  .compare-badge{
    /* no change */
  }
  .cta-section .cta-wrap{
    grid-template-columns:1fr;
  }
  .contact-panel{
    border-left:none;
    border-top:1px solid var(--line);
  }
}
@media (max-width:920px){
  .main-nav{
    display:none;
  }
  .nav-cta{
    margin-left:auto;
  }
  .burger{
    display:flex;
  }
  .mobile-menu{
    display:block;
    position:fixed;
    left:0;
    right:0;
    top:78px;
    bottom:0;
    background:rgba(5,9,19,.97);
    backdrop-filter:blur(12px);
    z-index:60;
    box-shadow:0 20px 40px rgba(0,0,0,.3);
    transform:translateY(-12px);
    opacity:0;
    visibility:hidden;
    transition:all .26s ease;
    overflow-y:auto;
  }
  .mobile-menu.open{
    transform:translateY(0);
    opacity:1;
    visibility:visible;
  }
  .mobile-menu-inner{
    padding:28px 20px 40px;
  }
  .mobile-menu nav ul{
    list-style:none;
    display:grid;
    gap:6px;
  }
  .mobile-menu nav a{
    display:block;
    padding:15px 8px;
    color:var(--text-strong);
    font-size:17px;
    font-weight:700;
    border-bottom:1px solid var(--line);
  }
  .mobile-menu nav a.active{
    color:var(--primary-light);
  }
  .mobile-cta{
    width:100%;
    margin-top:24px;
    justify-content:center;
  }
  .scene-item{
    grid-template-columns:1fr;
    gap:12px;
    justify-content:start;
    align-items:start;
  }
  .scene-link{
    padding-top:4px;
  }
}
@media (max-width:767px){
  .container{
    width:100%;
    padding-left:20px;
    padding-right:20px;
  }
  .site-footer .container,
  .header-inner,
  .section{
    padding-left:20px;
    padding-right:20px;
  }
  .header-inner{
    padding:0 20px;
  }
  .section{
    padding:64px 0;
  }
  .page-hero{
    padding:46px 0 58px;
  }
  .page-hero .container{
    padding-left:20px;
    padding-right:20px;
  }
  .hero-content h1{
    font-size:30px;
    line-height:1.3;
  }
  .hero-content .lead{
    font-size:16px;
  }
  .hero-actions .btn{
    flex:1 1 100%;
  }
  .overview-grid{
    display:grid;
    grid-template-columns:1fr;
  }
  .feature-large,
  .feature-pair{
    grid-column:1/-1;
  }
  .feature-pair{
    grid-template-columns:1fr;
  }
  .feature-large{
    grid-template-columns:1fr;
  }
  .feature-large .feature-photo{
    min-height:190px;
    position:relative;
  }
  .feature-large-content{
    padding:28px 24px 26px;
  }
  .feature-card{
    padding:26px 24px;
  }
  .section-head h2{
    font-size:25px;
  }
  .section-head p{
    font-size:16px;
  }
  .compare-grid{
    grid-template-columns:1fr;
  }
  .compare-item{
    padding:28px 23px;
  }
  .scene-item{
    padding:24px 20px;
    grid-template-columns:1fr;
    width:100%;
  }
  .footer-main{
    grid-template-columns:1fr;
    gap:34px;
    padding-bottom:34px;
  }
  .footer-links{
    gap:8px;
  }
  .footer-bottom{
    flex-direction:column;
    align-items:flex-start;
  }
  .cta-wrap{
    border-radius:16px;
  }
  .cta-copy{
    padding:36px 24px 30px;
  }
  .cta-copy h2{
    font-size:23px;
  }
  .contact-panel{
    padding:32px 24px;
  }
  .brand-name{
    font-size:19px;
  }
  .nav-cta{
    display:none;
  }
}
@media (max-width:400px){
  .header-inner{
    gap:8px;
  }
  .brand-mark{
    width:36px;
    height:36px;
  }
  .brand-name{
    font-size:17px;
  }
  .brand-name small{
    font-size:10px;
  }
}
@media (prefers-reduced-motion:reduce){
  *{
    transition:none!important;
    animation:none!important;
  }
  html{
    scroll-behavior:auto;
  }
}

/* roulang page: category4 */
:root{
  --page-bg:#060B18;
  --page-bg-alt:#0A1322;
  --card-bg:#0E1729;
  --card-bg-deep:#08101E;
  --line:rgba(150,190,240,.14);
  --line-bright:rgba(61,187,255,.35);
  --glass-bg:rgba(255,255,255,.055);
  --glass-border:rgba(168,204,255,.16);
  --primary:#3DBBFF;
  --primary-light:#7ED6FF;
  --warn:#FFC567;
  --success:#2BE0A6;
  --danger:#FF6B8B;
  --text:#E8F1FC;
  --muted:#A9BDD8;
  --weak:#7189A8;
  --radius-sm:8px;
  --radius:16px;
  --radius-lg:24px;
  --shadow-card:0 12px 32px rgba(0,6,20,.28);
  --shadow-hover:0 18px 48px rgba(2,24,60,.4);
  --header-h:78px;
}

*{
  box-sizing:border-box;
}

html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  min-height:100vh;
  background:
    linear-gradient(rgba(126,214,255,.02) 1px,transparent 1px),
    linear-gradient(90deg, rgba(126,214,255,.02) 1px,transparent 1px),
    var(--page-bg);
  background-size:44px 44px;
  color:var(--text);
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}

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

a{
  color:var(--primary);
  text-decoration:none;
  transition:color .2s ease,border-color .2s ease,background .2s ease;
}

a:hover{
  color:var(--primary-light);
}

p{
  margin:0 0 18px;
}

h1,h2,h3,h4{
  margin:0 0 18px;
  line-height:1.3;
  color:var(--text);
  font-weight:800;
}

ul,ol{
  margin:0;
  padding:0;
}

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

button{
  border:0;
  cursor:pointer;
}

:focus-visible{
  outline:2px solid var(--primary);
  outline-offset:3px;
  border-radius:6px;
}

.container{
  width:100%;
  max-width:1180px;
  margin:0 auto;
  padding:0 20px;
}

.section{
  padding:96px 0;
}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin-bottom:14px;
  padding:4px 14px;
  border:1px solid rgba(61,187,255,.28);
  border-radius:999px;
  background:rgba(61,187,255,.08);
  color:var(--primary-light);
  font-size:13px;
  font-weight:600;
  letter-spacing:.14em;
}

.section-head{
  max-width:820px;
  margin:0 auto 52px;
  text-align:center;
}

.section-head.left{
  margin-left:0;
  max-width:780px;
  text-align:left;
}

.section-head .eyebrow{
  margin-left:2px;
}

.section-head h2{
  margin:16px 0 14px;
  font-size:clamp(27px,3vw,40px);
  letter-spacing:.01em;
}

.section-head p{
  color:var(--muted);
  font-size:16px;
  line-height:1.85;
  margin-bottom:0;
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:46px;
  padding:10px 24px;
  border-radius:10px;
  border:1px solid transparent;
  font-weight:600;
  font-size:15px;
  line-height:1;
  transition:background .18s ease,border-color .18s ease,color .18s ease,box-shadow .18s ease,transform .12s ease;
  white-space:nowrap;
  text-align:center;
}

.btn:active{
  transform:translateY(1px);
}

.btn-primary{
  background:var(--primary);
  color:#061523;
  box-shadow:0 0 0 rgba(61,187,255,0);
}

.btn-primary:hover{
  background:var(--primary-light);
  color:#061523;
  box-shadow:0 0 18px rgba(61,187,255,.35);
}

.btn-ghost{
  background:var(--glass-bg);
  border-color:var(--primary);
  color:var(--primary);
  -webkit-backdrop-filter:blur(16px);
  backdrop-filter:blur(16px);
}

.btn-ghost:hover{
  background:rgba(61,187,255,.1);
  border-color:var(--primary-light);
  color:var(--primary-light);
}

/* Header */
.site-header{
  position:sticky;
  top:0;
  z-index:100;
  height:var(--header-h);
  background:rgba(6,11,24,.86);
  -webkit-backdrop-filter:blur(18px);
  backdrop-filter:blur(18px);
  border-bottom:1px solid var(--line);
}

.header-inner{
  display:flex;
  align-items:center;
  gap:24px;
  height:var(--header-h);
  position:relative;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:11px;
  flex-shrink:0;
  color:var(--text);
}

.brand:hover{
  color:var(--text);
}

.brand-mark{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:40px;
  height:40px;
  border:1px solid rgba(61,187,255,.5);
  border-radius:11px;
  color:var(--primary-light);
  font-weight:800;
  letter-spacing:.02em;
  background:rgba(61,187,255,.08);
  box-shadow:0 0 16px rgba(61,187,255,.12);
}

.brand-name{
  display:flex;
  flex-direction:column;
  font-size:22px;
  font-weight:800;
  line-height:1.1;
  letter-spacing:.02em;
}

.brand-name small{
  display:block;
  font-size:11px;
  font-weight:500;
  letter-spacing:.3em;
  color:var(--weak);
  line-height:1.4;
  text-transform:uppercase;
}

.main-nav{
  margin-left:auto;
}

.main-nav ul{
  display:flex;
  align-items:center;
  gap:22px;
  list-style:none;
}

.nav-link{
  position:relative;
  display:block;
  padding:8px 2px;
  color:var(--muted);
  font-size:15px;
  font-weight:500;
  transition:color .2s ease;
}

.nav-link::after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  width:100%;
  height:2px;
  border-radius:99px;
  background:linear-gradient(90deg,var(--primary),rgba(61,187,255,.2));
  opacity:0;
  transform:scaleX(.5);
  transition:opacity .2s ease,transform .2s ease;
}

.nav-link:hover{
  color:var(--primary-light);
}

.nav-link:hover::after,
.nav-link.active::after{
  opacity:1;
  transform:scaleX(1);
}

.nav-link.active{
  color:var(--primary-light);
}

.nav-cta{
  margin-left:2px;
}

.burger{
  display:none;
  align-items:center;
  justify-content:center;
  flex-direction:column;
  gap:5px;
  width:44px;
  height:44px;
  margin-left:auto;
  border:1px solid var(--line);
  border-radius:12px;
  background:rgba(255,255,255,.04);
}

.burger span{
  display:block;
  width:20px;
  height:2px;
  border-radius:4px;
  background:var(--text);
  transition:transform .2s ease,opacity .2s ease;
}

/* Page hero category */
.category-hero{
  position:relative;
  padding:74px 0 82px;
  background:
    linear-gradient(180deg, rgba(6,11,24,.93) 0%, rgba(10,19,34,.78) 100%),
    url("/assets/images/backpic/back-2.webp") center / cover no-repeat;
  border-bottom:1px solid var(--line);
}

.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  margin:0 0 24px;
  padding:0;
  list-style:none;
  color:var(--weak);
  font-size:14px;
}

.breadcrumb li+li::before{
  content:"/";
  margin:0 10px;
  color:rgba(113,137,168,.7);
}

.breadcrumb a{
  color:var(--weak);
}

.breadcrumb a:hover{
  color:var(--primary-light);
}

.breadcrumb .current{
  color:var(--muted);
}

.page-title{
  max-width:760px;
  margin:0 0 20px;
  font-size:clamp(32px,4vw,50px);
  line-height:1.25;
  font-weight:800;
  letter-spacing:.01em;
}

.page-subtitle{
  max-width:680px;
  margin:0 0 26px;
  color:var(--muted);
  font-size:17px;
  line-height:1.9;
}

.hero-actions{
  display:flex;
  flex-wrap:wrap;
  gap:14px;
  margin:26px 0 28px;
}

.topic-pills{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:12px;
}

.topic-pill{
  display:inline-flex;
  align-items:center;
  padding:6px 14px;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(255,255,255,.03);
  color:var(--muted);
  font-size:13px;
  font-weight:500;
  letter-spacing:.02em;
}

.topic-pill::before{
  content:"";
  width:6px;
  height:6px;
  margin-right:8px;
  border-radius:50%;
  background:var(--primary);
  box-shadow:0 0 10px rgba(61,187,255,.95);
}

/* Scope guide */
.help-guide{
  padding:90px 0;
}

.scope-grid{
  display:grid;
  grid-template-columns:minmax(0,1.04fr) minmax(340px,.96fr);
  gap:26px;
  align-items:stretch;
}

.scope-card{
  padding:34px 32px;
  border:1px solid var(--line);
  border-radius:22px;
  background:linear-gradient(145deg,rgba(22,36,61,.56),rgba(14,23,41,.94));
  box-shadow:var(--shadow-card);
  transition:border-color .2s ease,box-shadow .2s ease;
}

.scope-card:hover{
  border-color:rgba(61,187,255,.32);
  box-shadow:var(--shadow-hover);
}

.scope-card h3{
  font-size:24px;
  margin-bottom:12px;
}

.scope-card>p{
  color:var(--muted);
  margin-bottom:22px;
}

.route-list{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:14px;
  list-style:none;
}

.route-list li{
  min-height:92px;
  padding:16px 16px 14px;
  border:1px solid rgba(150,190,240,.13);
  border-radius:14px;
  background:rgba(8,16,30,.52);
  transition:border-color .2s ease,background .2s ease;
}

.route-list li:hover{
  border-color:rgba(61,187,255,.28);
  background:rgba(8,16,30,.78);
}

.route-list b{
  display:block;
  color:var(--text);
  font-size:16px;
  margin-bottom:5px;
}

.route-list span{
  color:var(--muted);
  font-size:14px;
  line-height:1.7;
}

.scope-figure{
  display:flex;
  flex-direction:column;
  margin:0;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:22px;
  background:var(--card-bg);
  box-shadow:var(--shadow-card);
}

.scope-figure img{
  flex:1;
  width:100%;
  min-height:300px;
  object-fit:cover;
}

.scope-figure figcaption{
  margin-top:0;
  padding:14px 22px;
  border-top:1px solid var(--line);
  background:var(--card-bg-deep);
  color:var(--muted);
  font-size:14px;
  line-height:1.7;
}

/* FAQ */
.faq-area{
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  background:linear-gradient(180deg,rgba(13,24,43,.4),rgba(10,19,34,.5));
}

.faq-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:18px;
  max-width:1120px;
  margin:0 auto;
  align-items:start;
}

.faq-card{
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:18px;
  background:rgba(14,23,41,.92);
  box-shadow:0 8px 24px rgba(0,6,20,.18);
  transition:border-color .2s ease,box-shadow .2s ease;
}

.faq-card:hover{
  border-color:rgba(61,187,255,.26);
}

.faq-card[open]{
  border-color:rgba(61,187,255,.4);
  box-shadow:0 14px 38px rgba(2,24,60,.34);
}

.faq-q{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:16px;
  margin:0;
  padding:20px 22px;
  list-style:none;
  color:var(--text);
  font-size:17px;
  font-weight:600;
  line-height:1.65;
  cursor:pointer;
  transition:color .2s ease,background .2s ease;
}

.faq-q::-webkit-details-marker{
  display:none;
}

.faq-q:hover{
  color:var(--primary-light);
  background:rgba(255,255,255,.02);
}

.faq-q:focus-visible{
  outline:2px solid var(--primary);
  outline-offset:-2px;
  border-radius:14px;
}

.faq-q::after{
  content:"+";
  flex:0 0 28px;
  width:28px;
  height:28px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border:1px solid rgba(61,187,255,.38);
  border-radius:9px;
  color:var(--primary);
  font-size:19px;
  font-weight:400;
  line-height:1;
  background:rgba(61,187,255,.06);
  transition:transform .22s ease,background .22s ease,color .22s ease,border-color .22s ease;
}

.faq-card[open] .faq-q::after{
  content:"−";
  color:#061523;
  background:var(--primary);
  border-color:var(--primary);
  transform:rotate(180deg);
}

.faq-a{
  padding:0 22px 22px;
  border-top:1px solid transparent;
  color:var(--muted);
  font-size:15px;
  line-height:1.85;
}

.faq-card[open] .faq-a{
  border-top-color:rgba(150,190,240,.12);
  padding-top:16px;
}

.faq-a p{
  margin:0;
}

.faq-bottom-note{
  max-width:720px;
  margin:42px auto 0;
  padding:22px 30px;
  border:1px dashed rgba(150,190,240,.22);
  border-radius:18px;
  text-align:center;
  background:rgba(255,255,255,.025);
}

.faq-bottom-note strong{
  color:var(--text);
  font-weight:700;
}

.faq-bottom-note .btn{
  margin-top:14px;
}

/* Contact / CTA */
.consult-section{
  padding:94px 0;
}

.consult-card{
  display:grid;
  grid-template-columns:minmax(0,.95fr) minmax(0,1.05fr);
  gap:40px;
  padding:42px;
  border:1px solid rgba(61,187,255,.25);
  border-radius:28px;
  background:
    linear-gradient(135deg,rgba(15,31,55,.95),rgba(10,19,34,.98));
  box-shadow:0 22px 60px rgba(0,8,28,.36);
}

.consult-intro h2{
  margin:14px 0 14px;
  font-size:clamp(25px,2.6vw,34px);
}

.consult-intro p{
  color:var(--muted);
  margin-bottom:18px;
}

.consult-points{
  list-style:none;
  margin-top:12px;
}

.consult-points li{
  position:relative;
  padding:5px 0 5px 28px;
  color:var(--muted);
  font-size:15px;
}

.consult-points li::before{
  content:"✓";
  position:absolute;
  left:0;
  top:6px;
  width:19px;
  height:19px;
  display:flex;
  align-items:center;
  justify-content:center;
  color:var(--success);
  font-size:12px;
}

.mini-form{
  display:block;
}

.form-row{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:16px;
}

.form-group{
  margin-bottom:18px;
}

.form-group.full{
  grid-column:1 / -1;
}

.form-group label{
  display:block;
  margin-bottom:8px;
  color:var(--text);
  font-size:14px;
  font-weight:600;
}

.form-control{
  width:100%;
  min-height:50px;
  padding:12px 15px;
  border:1px solid rgba(150,190,240,.2);
  border-radius:12px;
  background:rgba(6,11,24,.65);
  color:var(--text);
  font-size:15px;
  line-height:1.5;
  transition:border-color .2s ease,box-shadow .2s ease,background .2s ease;
}

textarea.form-control{
  min-height:112px;
  resize:vertical;
}

.form-control::placeholder{
  color:var(--weak);
}

.form-control:focus{
  outline:0;
  border-color:var(--primary);
  background:rgba(6,11,24,.9);
  box-shadow:0 0 0 3px rgba(61,187,255,.15);
}

.field-hint{
  display:block;
  margin-top:8px;
  color:var(--weak);
  font-size:13px;
  line-height:1.6;
}

.form-message{
  display:none;
  margin-top:16px;
  padding:14px 16px;
  border-radius:12px;
  font-size:15px;
  line-height:1.7;
}

.form-message.success{
  display:block;
  border:1px solid rgba(43,224,166,.35);
  background:rgba(43,224,166,.12);
  color:var(--success);
}

.form-message.error{
  display:block;
  border:1px solid rgba(255,107,139,.35);
  background:rgba(255,107,139,.1);
  color:#FFA5BB;
}

/* Footer */
.site-footer{
  padding:56px 0 24px;
  border-top:1px solid var(--line);
  background:var(--page-bg-alt);
}

.footer-main{
  display:grid;
  grid-template-columns:1.5fr .9fr .9fr;
  gap:48px;
  margin-bottom:44px;
}

.footer-brand-name{
  display:flex;
  align-items:center;
  gap:11px;
  font-size:21px;
  font-weight:800;
  color:var(--text);
  margin-bottom:16px;
}

.footer-tagline{
  color:var(--muted);
  font-size:15px;
  line-height:1.9;
  max-width:420px;
}

.footer-title{
  margin:8px 0 16px;
  color:var(--text);
  font-size:16px;
  font-weight:700;
}

.footer-links{
  list-style:none;
}

.footer-links li{
  margin-bottom:12px;
}

.footer-links a{
  color:var(--muted);
  font-size:15px;
}

.footer-links a:hover{
  color:var(--primary-light);
}

.footer-links li:last-child{
  color:var(--weak);
  font-size:14px;
}

.footer-bottom{
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:10px;
  padding-top:22px;
  border-top:1px solid rgba(150,190,240,.1);
  color:var(--weak);
  font-size:14px;
}

.footer-bottom p{
  margin:0;
}

/* Tablet */
@media (max-width:1099px){
  .section{
    padding:78px 0;
  }

  .header-inner{
    gap:18px;
  }

  .main-nav ul{
    gap:14px;
  }

  .nav-link{
    font-size:14px;
  }

  .brand-name{
    font-size:20px;
  }

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

  .consult-card{
    grid-template-columns:1fr;
    gap:28px;
    padding:34px;
  }
}

@media (max-width:980px){
  .scope-grid{
    grid-template-columns:1fr;
  }

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

  .footer-main{
    grid-template-columns:1fr 1fr;
    gap:34px;
  }
}

/* Mobile */
@media (max-width:899px){
  .main-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    display:none;
    flex-direction:column;
    gap:6px;
    padding:14px 28px 20px;
    border-bottom:1px solid var(--line);
    background:rgba(6,11,24,.98);
    -webkit-backdrop-filter:blur(20px);
    backdrop-filter:blur(20px);
  }

  .site-header.nav-open .main-nav{
    display:flex;
  }

  .main-nav ul{
    flex-direction:column;
    align-items:stretch;
    gap:2px;
  }

  .nav-link{
    padding:12px 0;
    border-bottom:1px solid transparent;
    font-size:16px;
  }

  .nav-link::after{
    display:none;
  }

  .nav-link:hover,
  .nav-link.active{
    color:var(--primary-light);
    border-bottom-color:var(--primary);
  }

  .page-nav-cta{
    display:none;
  }

  .nav-cta{
    display:none;
    justify-content:center;
    margin:14px 0 4px;
  }

  .site-header.nav-open .nav-cta{
    display:flex;
  }

  .burger{
    display:flex;
  }
}

@media (max-width:767px){
  body{
    font-size:15px;
  }

  .container{
    padding:0 16px;
  }

  .section{
    padding:62px 0;
  }

  .category-hero{
    padding:54px 0 58px;
  }

  .page-title{
    font-size:32px;
    line-height:1.3;
  }

  .page-subtitle{
    font-size:15px;
  }

  .hero-actions{
    flex-direction:column;
  }

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

  .scope-card{
    padding:24px 20px;
    border-radius:18px;
  }

  .route-list{
    grid-template-columns:1fr;
    gap:10px;
  }

  .route-list li{
    min-height:auto;
  }

  .scope-figure img{
    min-height:220px;
  }

  .faq-area{
    padding:62px 0;
  }

  .faq-card{
    border-radius:16px;
  }

  .faq-q{
    padding:16px 18px;
    font-size:16px;
  }

  .faq-a{
    padding:0 18px 18px;
  }

  .consult-section{
    padding:62px 0;
  }

  .consult-card{
    padding:24px 18px;
    border-radius:20px;
  }

  .form-row{
    grid-template-columns:1fr;
  }

  .footer-main{
    grid-template-columns:1fr;
    gap:30px;
  }

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

@media (max-width:520px){
  .brand-mark{
    width:36px;
    height:36px;
    border-radius:10px;
  }

  .brand-name{
    font-size:18px;
  }

  .header-inner{
    gap:10px;
  }

  .page-title{
    font-size:29px;
  }

  .section-head h2{
    font-size:26px;
  }
}