/* roulang page: index */
:root{
  --bg-0:#0A0D11;
  --bg-1:#10151B;
  --bg-2:#171E26;
  --brand:#1FE0B4;
  --brand-light:#4CFFD0;
  --brand-dark:#0E9C7C;
  --accent:#FF7A2F;
  --lime:#C8FF4D;
  --text:#E9EFF5;
  --text-2:#9DAAB8;
  --text-3:#68747F;
  --line:rgba(255,255,255,.08);
  --line-strong:rgba(255,255,255,.18);
  --radius-card:14px;
  --radius-btn:10px;
  --radius-img:12px;
  --shadow-card:0 14px 34px rgba(0,0,0,.42);
  --ease:cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg-0);
  color:var(--text);
  font-family:"PingFang SC","HarmonyOS Sans","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.85;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border:0}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}
h1,h2,h3,h4,p,figure{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
::selection{background:rgba(31,224,180,.28);color:#fff}

.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
@media (min-width:768px){.container{padding:0 24px}}
@media (min-width:1024px){.container{padding:0 32px}}

.section{padding:64px 0}
@media (min-width:768px){.section{padding:88px 0}}
@media (min-width:1024px){.section{padding:112px 0}}
.section--alt{background:var(--bg-1);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section--tight{padding:52px 0}
@media (min-width:1024px){.section--tight{padding:72px 0}}

.section-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:18px;margin-bottom:34px}
.section-title{font-size:clamp(22px,3vw,32px);line-height:1.35;font-weight:700;letter-spacing:-.01em}
.section-sub{margin-top:10px;font-size:15px;line-height:1.8;color:var(--text-2);max-width:720px}
.kicker{
  display:inline-flex;align-items:center;gap:8px;
  margin-bottom:14px;padding:6px 13px;
  font-size:12.5px;letter-spacing:.06em;
  color:var(--brand);
  background:rgba(31,224,180,.09);
  border:1px solid rgba(31,224,180,.28);
  border-radius:999px;
}
.kicker::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--brand);box-shadow:0 0 8px rgba(31,224,180,.9)}
.link-more{font-size:14.5px;font-weight:600;color:var(--brand);transition:color .2s var(--ease)}
.link-more:hover{color:var(--brand-light)}

/* header */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(10,13,17,.86);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
}
.site-header::after{
  content:"";display:block;height:1px;
  background:linear-gradient(90deg,rgba(31,224,180,.9),rgba(31,224,180,.16) 46%,rgba(31,224,180,0) 100%);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;height:64px}
@media (min-width:1024px){.header-inner{height:72px}}

.logo{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.logo-mark{
  position:relative;width:28px;height:28px;border-radius:8px;
  border:1.5px solid var(--brand);
  box-shadow:0 0 12px rgba(31,224,180,.35);
}
.logo-mark::after{content:"";position:absolute;inset:7px;border-radius:3px;background:var(--brand);opacity:.85}
.logo-text{display:flex;flex-direction:column;justify-content:center}
.logo-line1{display:block;font-size:14px;font-weight:700;line-height:1.15;color:var(--text);letter-spacing:.02em;white-space:nowrap}
.logo-line2{display:block;font-size:11px;font-weight:600;line-height:1.25;color:var(--brand);letter-spacing:.08em}

.main-nav{display:none}
@media (min-width:1024px){.main-nav{display:flex;align-items:center;gap:2px}}
.nav-link{
  position:relative;display:block;padding:10px 14px;
  font-size:14.5px;color:var(--text-2);
  border-radius:8px;
  transition:color .2s var(--ease);
}
.nav-link:hover{color:var(--brand-light)}
.nav-link.active{color:var(--text)}
.nav-link.active::after{
  content:"";position:absolute;left:14px;right:14px;bottom:2px;height:2px;border-radius:2px;
  background:var(--brand);box-shadow:0 0 10px rgba(31,224,180,.8);
}
.nav-link.active::before{
  content:"";position:absolute;left:4px;top:50%;transform:translateY(-50%);
  width:4px;height:4px;border-radius:50%;background:var(--brand);
  box-shadow:0 0 8px rgba(31,224,180,.9);
}

.header-actions{display:flex;align-items:center;gap:10px}
.header-cta{display:none}
@media (min-width:1024px){.header-cta{display:inline-flex}}

/* buttons */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:14px 24px;font-size:15px;font-weight:600;line-height:1;
  border-radius:var(--radius-btn);border:1px solid transparent;
  cursor:pointer;white-space:nowrap;
  transition:transform .2s var(--ease),box-shadow .2s var(--ease),background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.btn-sm{padding:11px 18px;font-size:14px}
.btn-primary{background:var(--brand);color:#04120E}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 10px 28px rgba(31,224,180,.32);filter:brightness(1.06)}
.btn-primary:active{transform:translateY(1px)}
.btn-ghost{background:transparent;color:var(--text);border-color:var(--line-strong)}
.btn-ghost:hover{border-color:var(--brand);background:rgba(31,224,180,.08);color:var(--brand-light)}
.btn:focus-visible{outline:2px solid var(--brand);outline-offset:2px}

/* mobile nav */
.menu-toggle{
  display:inline-flex;flex-direction:column;justify-content:center;gap:4px;
  width:42px;height:42px;padding:0 10px;
  background:rgba(255,255,255,.04);
  border:1px solid var(--line-strong);border-radius:10px;cursor:pointer;
}
.menu-toggle span{display:block;height:2px;border-radius:2px;background:var(--text);transition:background-color .2s var(--ease)}
.menu-toggle:hover span{background:var(--brand)}
@media (min-width:1024px){.menu-toggle{display:none}}

.drawer{
  position:fixed;inset:0;z-index:90;display:flex;flex-direction:column;
  background:rgba(10,13,17,.98);
  transform:translateX(100%);
  transition:transform .24s var(--ease);
  visibility:hidden;
}
.drawer.open{transform:translateX(0);visibility:visible}
.drawer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(135deg,rgba(31,224,180,.06) 0 2px,transparent 2px 18px);
}
.drawer-head{
  position:relative;display:flex;align-items:center;justify-content:space-between;
  padding:14px 20px;border-bottom:1px solid var(--line);
}
.drawer-close{
  width:40px;height:40px;border-radius:10px;cursor:pointer;
  background:transparent;border:1px solid var(--line-strong);
  font-size:22px;line-height:1;color:var(--text-2);
}
.drawer-close:hover{border-color:var(--brand);color:var(--brand)}
.drawer-nav{position:relative;flex:1;overflow-y:auto;padding:8px 0}
.drawer-link{
  display:flex;align-items:center;height:56px;padding:0 20px;
  font-size:15.5px;color:var(--text-2);border-bottom:1px solid var(--line);
}
.drawer-link.active{color:var(--brand);box-shadow:inset 3px 0 0 var(--brand)}
.drawer-foot{position:relative;padding:18px 20px 26px;border-top:1px solid var(--line)}
.drawer-cta{width:100%}

/* hero */
.hero{
  position:relative;overflow:hidden;
  display:flex;align-items:center;
  min-height:500px;padding:56px 0 64px;
  background:
    radial-gradient(900px 420px at 80% 6%,rgba(31,224,180,.14),transparent 62%),
    radial-gradient(680px 340px at 4% 94%,rgba(255,122,47,.09),transparent 58%),
    var(--bg-0);
}
.hero::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:url(/assets/images/backpic/back-2.webp);
  background-size:cover;background-position:center;
  opacity:.09;
}
@media (min-width:1024px){.hero{min-height:560px;padding:76px 0 88px}}
.hero .container{position:relative;z-index:1}
.hero-grid{display:grid;gap:32px;align-items:center}
@media (min-width:1024px){.hero-grid{grid-template-columns:1.05fr .95fr;gap:52px}}
.hero h1{font-size:clamp(28px,4.6vw,44px);line-height:1.25;font-weight:700;letter-spacing:-.015em;margin-bottom:16px}
.hero-sub{font-size:17px;line-height:1.7;color:var(--text-2);max-width:560px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px}
.hero-metrics{
  display:grid;grid-template-columns:repeat(3,1fr);gap:16px;
  margin-top:36px;padding-top:24px;border-top:1px solid var(--line);
}
.metric-num{font-size:21px;font-weight:700;color:var(--brand);line-height:1.2;font-variant-numeric:tabular-nums;letter-spacing:.02em}
.metric-label{margin-top:4px;font-size:13px;line-height:1.6;color:var(--text-3)}
.hero-media{position:relative;border-radius:var(--radius-img);overflow:hidden;border:1px solid var(--line);box-shadow:0 24px 60px rgba(0,0,0,.5)}
.hero-media img{width:100%;height:clamp(230px,42vw,420px);object-fit:cover}
.hero-media::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,13,17,.06),rgba(10,13,17,.55))}

/* pain */
.pain-grid{display:grid;gap:16px;grid-template-columns:1fr}
@media (min-width:640px){.pain-grid{grid-template-columns:repeat(2,1fr);gap:20px}}
.pain-card{
  display:flex;gap:16px;padding:22px;
  background:var(--bg-1);border:1px solid var(--line);border-radius:var(--radius-card);
  transition:transform .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.pain-card:hover{transform:translateY(-3px);border-color:rgba(31,224,180,.4);box-shadow:var(--shadow-card)}
.pain-icon{
  flex:0 0 44px;width:44px;height:44px;border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  color:var(--brand);background:rgba(31,224,180,.08);border:1px solid rgba(31,224,180,.32);
}
.pain-title{font-size:17px;font-weight:600;line-height:1.5}
.pain-text{margin-top:5px;font-size:14.5px;line-height:1.75;color:var(--text-2)}

/* solve */
.solve-grid{display:grid;gap:32px;align-items:center}
@media (min-width:1024px){.solve-grid{grid-template-columns:.92fr 1.08fr;gap:56px}}
.solve-media{border-radius:var(--radius-img);overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow-card)}
.solve-media img{width:100%;height:100%;min-height:250px;object-fit:cover}
.steps{display:flex;flex-direction:column;gap:30px}
.step{position:relative;display:flex;gap:18px;align-items:flex-start}
.step:not(:last-child)::after{
  content:"";position:absolute;left:27px;top:46px;bottom:-30px;width:1px;
  background:linear-gradient(180deg,rgba(31,224,180,.6),rgba(31,224,180,0));
}
.step-num{
  flex:0 0 56px;width:56px;text-align:center;
  font-size:30px;font-weight:700;line-height:1.1;
  color:var(--brand);font-variant-numeric:tabular-nums;letter-spacing:.02em;
}
.step-title{font-size:19px;font-weight:600;line-height:1.5}
.step-text{margin-top:6px;font-size:15px;line-height:1.8;color:var(--text-2)}

/* stats */
.stats-band{position:relative;overflow:hidden;background:var(--bg-1);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:52px 0}
@media (min-width:1024px){.stats-band{padding:72px 0}}
.stats-band::before{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;
  background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:44px 44px;
}
.stats-grid{position:relative;display:grid;gap:26px;grid-template-columns:repeat(2,1fr)}
@media (min-width:1024px){.stats-grid{grid-template-columns:repeat(4,1fr)}}
.stat-num{font-size:clamp(28px,4vw,40px);font-weight:700;line-height:1.12;font-variant-numeric:tabular-nums;letter-spacing:.02em}
.stat--brand{color:var(--brand)}
.stat--lime{color:var(--lime)}
.stat-label{margin-top:8px;font-size:14px;line-height:1.7;color:var(--text-2)}

/* quotes */
.quote-grid{display:grid;gap:20px;grid-template-columns:1fr}
@media (min-width:768px){.quote-grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:1024px){.quote-grid{grid-template-columns:repeat(3,1fr)}}
.quote-card{
  position:relative;overflow:hidden;padding:26px 24px;
  background:var(--bg-2);border:1px solid var(--line);border-radius:var(--radius-card);
  transition:transform .2s var(--ease),border-color .2s var(--ease)
}
.quote-card:hover{transform:translateY(-3px);border-color:rgba(31,224,180,.4)}
.quote-card::before{
  content:"“";position:absolute;top:-14px;right:14px;
  font-family:Georgia,"Times New Roman",serif;font-size:104px;line-height:1;
  color:rgba(31,224,180,.12);
}
.quote-text{position:relative;font-size:15.5px;line-height:1.85}
.quote-person{display:flex;align-items:center;gap:12px;margin-top:20px;padding-top:16px;border-top:1px solid var(--line)}
.quote-avatar{width:56px;height:56px;border-radius:50%;object-fit:cover;border:1px solid rgba(31,224,180,.35)}
.quote-name{font-size:14.5px;font-weight:600;line-height:1.4}
.quote-role{margin-top:2px;font-size:13px;color:var(--text-3)}

/* cards / news */
.news-grid{display:grid;gap:20px;grid-template-columns:1fr}
@media (min-width:768px){.news-grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:1024px){.news-grid{grid-template-columns:repeat(3,1fr)}}
.card{
  display:flex;flex-direction:column;
  background:var(--bg-2);border:1px solid var(--line);border-radius:var(--radius-card);
  overflow:hidden;
  transition:transform .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.card:hover{transform:translateY(-3px);border-color:rgba(31,224,180,.4);box-shadow:0 16px 36px rgba(0,0,0,.45)}
.card-cover{display:block;aspect-ratio:16/9;overflow:hidden;background:var(--bg-1)}
.card-cover img{width:100%;height:100%;object-fit:cover;transition:transform .25s var(--ease)}
.card:hover .card-cover img{transform:scale(1.04)}
.card-body{display:flex;flex-direction:column;flex:1;padding:20px 22px 22px}
.card-title{
  margin-top:12px;font-size:17px;font-weight:600;line-height:1.5;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.card-title a{transition:color .2s var(--ease)}
.card-title a:hover{color:var(--brand-light)}
.card-excerpt{
  margin-top:8px;font-size:14px;line-height:1.75;color:var(--text-2);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.card-foot{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  margin-top:auto;padding-top:14px;border-top:1px solid var(--line);
  font-size:13px;color:var(--text-3);
}
.card-read{color:var(--brand);font-weight:600}
.badge{
  display:inline-flex;align-items:center;align-self:flex-start;
  padding:6px 10px;font-size:12px;line-height:1;letter-spacing:.06em;
  color:var(--brand);background:rgba(31,224,180,.12);border-radius:999px;
}
.badge-time{color:var(--lime);background:transparent;border:1px solid rgba(200,255,77,.35)}
time{font-variant-numeric:tabular-nums;letter-spacing:.02em}

.empty-state{
  padding:44px 24px;text-align:center;
  border:1px dashed rgba(255,255,255,.2);border-radius:var(--radius-card);
  background:var(--bg-2);
}
.empty-state p{color:var(--text-2);font-size:15px;margin-bottom:18px}

/* faq */
.faq-list{display:flex;flex-direction:column;gap:12px;max-width:900px}
.faq-item{
  background:var(--bg-1);border:1px solid var(--line);border-radius:var(--radius-card);
  overflow:hidden;transition:border-color .2s var(--ease)
}
.faq-item.open{border-color:rgba(31,224,180,.35)}
.faq-q{
  position:relative;width:100%;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:20px 22px;text-align:left;
  background:none;border:0;cursor:pointer;
  font-size:16px;font-weight:600;line-height:1.6;color:var(--text);
}
.faq-item.open .faq-q::before{
  content:"";position:absolute;left:0;top:14px;bottom:14px;width:3px;
  background:var(--brand);border-radius:0 3px 3px 0;
}
.faq-q:focus-visible{outline:2px solid var(--brand);outline-offset:-3px}
.faq-icon{position:relative;flex:0 0 18px;width:18px;height:18px}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;background:var(--brand);border-radius:2px}
.faq-icon::before{left:0;right:0;top:8px;height:2px}
.faq-icon::after{top:0;bottom:0;left:8px;width:2px;transition:transform .2s var(--ease)}
.faq-item.open .faq-icon::after{transform:scaleY(0)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .22s var(--ease)}
.faq-a p{padding:0 22px 20px;font-size:15px;line-height:1.8;color:var(--text-2)}
.faq-item.open .faq-a{max-height:400px}

/* cta */
.cta-band{
  position:relative;overflow:hidden;text-align:center;
  padding:42px 24px;
  background:var(--bg-1);
  border:1px solid rgba(31,224,180,.35);
  border-radius:18px;
}
.cta-band::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:repeating-linear-gradient(115deg,rgba(31,224,180,.12) 0 1px,transparent 1px 24px);
}
.cta-inner{position:relative;z-index:1}
.cta-title{font-size:clamp(21px,2.8vw,28px);font-weight:700;line-height:1.4}
.cta-text{margin:12px auto 26px;max-width:640px;font-size:15px;line-height:1.8;color:var(--text-2)}

/* footer */
.site-footer{position:relative;background:var(--bg-1);border-top:1px solid var(--line);padding:56px 0 26px}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,rgba(31,224,180,.85),rgba(31,224,180,.12) 52%,transparent);
}
.footer-grid{display:grid;gap:32px;grid-template-columns:1fr}
@media (min-width:768px){.footer-grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:1024px){.footer-grid{grid-template-columns:1.5fr 1fr 1fr 1fr}}
.footer-desc{margin-top:16px;font-size:14px;line-height:1.8;color:var(--text-2);max-width:320px}
.footer-title{font-size:14px;font-weight:600;letter-spacing:.06em;margin-bottom:16px;color:var(--text)}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-links a{font-size:14px;color:var(--text-2);transition:color .2s var(--ease)}
.footer-links a:hover{color:var(--brand)}
.footer-contact{display:flex;flex-direction:column;gap:10px;font-size:14px;color:var(--text-2)}
.footer-bottom{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px;
  margin-top:40px;padding-top:20px;border-top:1px solid var(--line);
  font-size:13px;color:var(--text-3);
}

/* to top */
.to-top{
  position:fixed;right:20px;bottom:24px;z-index:70;
  width:44px;height:44px;border-radius:12px;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  background:var(--bg-2);border:1px solid var(--line-strong);color:var(--brand);
  opacity:0;visibility:hidden;
  transition:opacity .2s var(--ease),visibility .2s var(--ease),transform .2s var(--ease),border-color .2s var(--ease);
}
.to-top.show{opacity:1;visibility:visible}
.to-top:hover{border-color:var(--brand);transform:translateY(-2px)}
.to-top:focus-visible{outline:2px solid var(--brand);outline-offset:2px}

@media (max-width:520px){
  .hero-metrics{grid-template-columns:1fr;gap:12px}
  .metric-num{font-size:19px}
  .btn{width:100%}
  .hero-actions{flex-direction:column}
  .header-cta{display:none}
}

@media (prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important;scroll-behavior:auto !important}
}

/* roulang page: category1 */
:root{
  --bg-0:#0A0D11;
  --bg-1:#10151B;
  --bg-2:#171E26;
  --brand:#1FE0B4;
  --brand-light:#4CFFD0;
  --brand-dark:#0E9C7C;
  --accent:#FF7A2F;
  --lime:#C8FF4D;
  --text:#E9EFF5;
  --text-2:#9DAAB8;
  --text-3:#68747F;
  --line:rgba(255,255,255,.08);
  --line-strong:rgba(255,255,255,.18);
  --radius-card:14px;
  --radius-btn:10px;
  --radius-img:12px;
  --container:1200px;
  --shadow-card:0 1px 0 rgba(255,255,255,.03), 0 18px 40px -28px rgba(0,0,0,.9);
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;
  background:var(--bg-0);
  color:var(--text);
  font-family:"PingFang SC","HarmonyOS Sans","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.85;
  text-align:left;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;transition:color .18s ease-out;}
button,input{font:inherit;}
h1,h2,h3,h4{margin:0;font-weight:700;letter-spacing:.01em;}
h1{font-size:clamp(28px,4.6vw,44px);line-height:1.25;}
h2{font-size:clamp(22px,3vw,32px);line-height:1.35;}
h3{font-size:19px;line-height:1.5;font-weight:600;}
p{margin:0 0 1.2em;}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;}
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 20px;}
@media(min-width:768px){.container{padding:0 24px;}}
@media(min-width:1024px){.container{padding:0 32px;}}

/* ============ 顶栏 ============ */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(10,13,17,.86);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
}
.site-header::after{
  content:"";display:block;height:1px;
  background:linear-gradient(90deg,var(--brand) 0%,rgba(31,224,180,.25) 35%,rgba(31,224,180,0) 75%);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;height:64px;}
@media(min-width:1024px){.header-inner{height:72px;}}
.logo{display:flex;align-items:center;gap:10px;flex-shrink:0;}
.logo-mark{
  width:28px;height:28px;border-radius:8px;flex-shrink:0;
  border:1.5px solid var(--brand);
  background:linear-gradient(135deg,rgba(31,224,180,.28),rgba(31,224,180,0) 70%);
  box-shadow:0 0 12px rgba(31,224,180,.35),inset 0 0 10px rgba(31,224,180,.25);
}
.logo-text{display:flex;flex-direction:column;line-height:1.16;}
.logo-line1{font-size:13px;color:var(--text);letter-spacing:.02em;}
.logo-line2{font-size:12px;color:var(--brand);letter-spacing:.08em;}
.main-nav{display:none;align-items:center;gap:4px;}
@media(min-width:1024px){.main-nav{display:flex;}}
.nav-link{
  position:relative;padding:9px 12px;font-size:14.5px;color:var(--text-2);
  border-radius:8px;transition:color .18s ease-out,background .18s ease-out;
}
.nav-link:hover{color:var(--brand);background:rgba(31,224,180,.06);}
.nav-link.active{color:var(--text);}
.nav-link.active::after{
  content:"";position:absolute;left:12px;right:12px;bottom:1px;height:2px;border-radius:2px;
  background:var(--brand);box-shadow:0 0 10px rgba(31,224,180,.85);
}
.nav-link.active::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:4px;height:4px;border-radius:50%;background:var(--brand);
  box-shadow:0 0 8px rgba(31,224,180,.9);
}
.header-actions{display:flex;align-items:center;gap:10px;}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:var(--radius-btn);border:1px solid transparent;
  font-size:15px;font-weight:600;cursor:pointer;text-align:center;
  transition:transform .18s ease-out,box-shadow .18s ease-out,background .18s ease-out,border-color .18s ease-out,color .18s ease-out;
}
.btn-primary{background:var(--brand);color:#06231C;box-shadow:0 0 0 rgba(31,224,180,0);}
.btn-primary:hover{transform:translateY(-1px);background:#33ecc1;box-shadow:0 10px 26px -12px rgba(31,224,180,.75);}
.btn-primary:active{transform:translateY(1px);}
.btn-ghost{background:transparent;color:var(--text);border-color:var(--line-strong);}
.btn-ghost:hover{border-color:var(--brand);background:rgba(31,224,180,.08);color:var(--brand-light);}
.btn-sm{padding:9px 16px;font-size:14px;}
.header-cta{display:none;}
@media(min-width:768px){.header-cta{display:inline-flex;}}
.menu-toggle{
  display:inline-flex;flex-direction:column;justify-content:center;gap:5px;
  width:42px;height:42px;padding:0 10px;border-radius:10px;
  background:var(--bg-2);border:1px solid var(--line);cursor:pointer;
}
.menu-toggle span{display:block;height:2px;border-radius:2px;background:var(--text-2);transition:background .18s ease-out;}
.menu-toggle:hover span{background:var(--brand);}
@media(min-width:1024px){.menu-toggle{display:none;}}

/* 移动抽屉 */
.mobile-drawer{
  position:fixed;inset:64px 0 0 0;z-index:55;
  background:
    repeating-linear-gradient(135deg,rgba(31,224,180,.06) 0 2px,transparent 2px 12px),
    var(--bg-0);
  border-top:1px solid var(--line);
  display:flex;flex-direction:column;padding:12px 0 20px;
  overflow-y:auto;
}
.mobile-drawer[hidden]{display:none;}
.drawer-nav{display:flex;flex-direction:column;}
.drawer-nav a{
  padding:0 24px;height:56px;display:flex;align-items:center;
  font-size:16px;color:var(--text-2);border-bottom:1px solid var(--line);
}
.drawer-nav a.active{color:var(--brand);box-shadow:inset 3px 0 0 var(--brand);}
.drawer-foot{margin-top:auto;padding:20px 24px 0;}
.drawer-cta{width:100%;}

/* ============ 主区 ============ */
main{display:block;}
.section{padding:64px 0;}
@media(min-width:768px){.section{padding:88px 0;}}
@media(min-width:1024px){.section{padding:112px 0;}}
.section-tight{padding:48px 0;}
.band{background:var(--bg-1);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.section-head{max-width:760px;margin-bottom:32px;}
.section-head p{color:var(--text-2);margin:14px 0 0;}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12.5px;letter-spacing:.06em;color:var(--brand);
  background:rgba(31,224,180,.12);border-radius:999px;padding:5px 12px;margin-bottom:16px;
}
.eyebrow::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--brand);box-shadow:0 0 8px rgba(31,224,180,.9);}

/* 面包屑 */
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:14px;color:var(--text-3);margin-bottom:22px;}
.breadcrumb a{color:var(--text-2);}
.breadcrumb a:hover{color:var(--brand);}
.breadcrumb .sep{color:var(--text-3);}
.breadcrumb .now{color:var(--text);}

/* 页头 */
.page-hero{
  position:relative;overflow:hidden;
  background:
    radial-gradient(900px 420px at 88% -10%,rgba(31,224,180,.16),transparent 65%),
    var(--bg-1);
  border-bottom:1px solid var(--line);
  padding:44px 0 56px;
}
@media(min-width:1024px){.page-hero{padding:56px 0 72px;}}
.hero-grid{display:grid;grid-template-columns:1fr;gap:32px;align-items:center;}
@media(min-width:1024px){.hero-grid{grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);gap:48px;}}
.page-hero h1{max-width:16em;}
.hero-lead{color:var(--text-2);font-size:16.5px;margin:18px 0 0;max-width:44em;}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px;}
.hero-figure{
  position:relative;border-radius:var(--radius-img);overflow:hidden;
  border:1px solid var(--line);box-shadow:var(--shadow-card);
}
.hero-figure img{width:100%;height:100%;object-fit:cover;aspect-ratio:16/11;}
.hero-figure::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(10,13,17,0) 45%,rgba(10,13,17,.75) 100%);
}
.hero-chips{position:absolute;left:16px;bottom:14px;right:16px;display:flex;flex-wrap:wrap;gap:8px;z-index:2;}
.chip{
  font-size:12px;letter-spacing:.04em;padding:5px 11px;border-radius:999px;
  background:rgba(31,224,180,.14);color:var(--brand-light);border:1px solid rgba(31,224,180,.35);
}
.chip.lime{background:rgba(200,255,77,.12);color:var(--lime);border-color:rgba(200,255,77,.35);}

/* 步骤时间轴 */
.step-list{list-style:none;margin:0;padding:0;max-width:860px;}
.step-item{position:relative;padding:0 0 30px 68px;}
.step-item:last-child{padding-bottom:0;}
.step-item::before{
  content:"";position:absolute;left:21px;top:44px;bottom:0;width:1px;
  background:linear-gradient(180deg,rgba(31,224,180,.6),rgba(31,224,180,0));
}
.step-item:last-child::before{display:none;}
.step-num{
  position:absolute;left:0;top:0;width:44px;height:44px;border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  font-size:16px;font-weight:700;font-variant-numeric:tabular-nums;
  color:var(--brand);background:var(--bg-2);border:1px solid rgba(31,224,180,.35);
  box-shadow:0 0 18px -6px rgba(31,224,180,.55);
}
.step-item h3{margin-bottom:8px;}
.step-item p{color:var(--text-2);font-size:15.5px;margin:0;}
.step-note{margin-top:10px;font-size:14px;color:var(--text-3);}
.step-note strong{color:var(--lime);font-weight:600;font-variant-numeric:tabular-nums;}

/* 卡片 */
.card{
  background:var(--bg-2);border:1px solid var(--line);border-radius:var(--radius-card);
  padding:22px;box-shadow:var(--shadow-card);
  transition:transform .2s ease-out,border-color .2s ease-out,box-shadow .2s ease-out;
}
.card:hover{transform:translateY(-3px);border-color:rgba(31,224,180,.4);box-shadow:0 22px 44px -30px rgba(31,224,180,.7);}
.card h3{margin-bottom:8px;}
.card p{color:var(--text-2);font-size:15px;margin:0;}
.grid-2{display:grid;grid-template-columns:1fr;gap:18px;}
@media(min-width:768px){.grid-2{grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;}}
.grid-3{display:grid;grid-template-columns:1fr;gap:18px;}
@media(min-width:768px){.grid-3{grid-template-columns:repeat(2,minmax(0,1fr));}}
@media(min-width:1024px){.grid-3{grid-template-columns:repeat(3,minmax(0,1fr));}}

/* 表格 */
.table-wrap{
  overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius-card);
  background:var(--bg-1);box-shadow:var(--shadow-card);
}
table.device-table{width:100%;border-collapse:collapse;min-width:640px;font-size:15px;}
.device-table caption{
  caption-side:top;text-align:left;padding:18px 20px 12px;
  font-size:14px;color:var(--text-3);
}
.device-table th,.device-table td{border-bottom:1px solid var(--line);padding:14px 18px;text-align:left;vertical-align:top;}
.device-table thead th{
  background:var(--bg-2);color:var(--text);font-weight:600;font-size:14.5px;
  letter-spacing:.02em;border-bottom:1px solid var(--line-strong);
}
.device-table tbody tr:nth-child(odd){background:rgba(23,30,38,.55);}
.device-table tbody td:first-child{color:var(--brand-light);font-weight:600;}
.device-table tbody tr:last-child td{border-bottom:0;}
.device-table td{color:var(--text-2);}

/* 提示卡 */
.note-card{
  background:var(--bg-1);border:1px solid var(--line);border-left:3px solid var(--accent);
  border-radius:12px;padding:22px 24px;
}
.note-card h3{margin-bottom:6px;}
.note-list{list-style:none;margin:14px 0 0;padding:0;}
.note-list li{
  position:relative;padding:8px 0 8px 22px;color:var(--text-2);font-size:15px;
  border-bottom:1px dashed rgba(255,255,255,.06);
}
.note-list li:last-child{border-bottom:0;}
.note-list li::before{
  content:"";position:absolute;left:0;top:19px;width:8px;height:8px;border-radius:2px;
  background:var(--accent);box-shadow:0 0 8px rgba(255,122,47,.55);
}

/* 指标条 */
.metrics{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;}
@media(min-width:768px){.metrics{grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;}}
.metric{
  padding:20px;border-radius:var(--radius-card);background:var(--bg-2);
  border:1px solid var(--line);border-top:2px solid rgba(31,224,180,.55);
}
.metric .num{
  display:block;font-size:clamp(26px,3.6vw,34px);font-weight:700;color:var(--brand);
  font-variant-numeric:tabular-nums;letter-spacing:.02em;line-height:1.2;
}
.metric:nth-child(even) .num{color:var(--lime);}
.metric .label{display:block;margin-top:6px;font-size:14px;color:var(--text-2);}

/* FAQ */
.faq-list{display:flex;flex-direction:column;gap:12px;max-width:900px;}
.faq-item{
  background:var(--bg-1);border:1px solid var(--line);border-radius:12px;overflow:hidden;
  transition:border-color .2s ease-out;
}
.faq-item.open{border-color:rgba(31,224,180,.4);box-shadow:inset 3px 0 0 var(--brand);}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:17px 20px;background:none;border:0;color:var(--text);
  font-size:16px;font-weight:600;text-align:left;cursor:pointer;
}
.faq-q:hover{color:var(--brand-light);}
.faq-q .mark{
  flex-shrink:0;width:18px;height:18px;position:relative;
}
.faq-q .mark::before,.faq-q .mark::after{
  content:"";position:absolute;background:var(--brand);border-radius:2px;transition:transform .2s ease-out;
}
.faq-q .mark::before{left:0;top:8px;width:18px;height:2px;}
.faq-q .mark::after{left:8px;top:0;width:2px;height:18px;}
.faq-item.open .mark::after{transform:scaleY(0);}
.faq-a{display:none;padding:0 20px 18px;font-size:15px;line-height:1.8;color:var(--text-2);}
.faq-item.open .faq-a{display:block;}

/* CTA 条 */
.cta-band{
  position:relative;overflow:hidden;text-align:center;
  background:var(--bg-1);border:1px solid rgba(31,224,180,.45);border-radius:16px;
  padding:38px 24px;
}
.cta-band::before{
  content:"";position:absolute;inset:0;opacity:.5;
  background:repeating-linear-gradient(115deg,rgba(31,224,180,.09) 0 1px,transparent 1px 16px);
}
.cta-inner{position:relative;z-index:2;}
.cta-band h2{margin-bottom:12px;}
.cta-band p{color:var(--text-2);max-width:620px;margin:0 auto 24px;}

/* 页脚 */
.site-footer{
  position:relative;background:var(--bg-1);border-top:1px solid var(--line);
  padding:56px 0 26px;margin-top:8px;
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,var(--brand),rgba(31,224,180,0) 70%);
}
.footer-grid{display:grid;grid-template-columns:1fr;gap:32px;}
@media(min-width:768px){.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));}}
@media(min-width:1024px){.footer-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:28px;}}
.footer-desc{color:var(--text-3);font-size:14px;margin:16px 0 0;max-width:26em;}
.footer-title{font-size:14px;letter-spacing:.06em;color:var(--text);margin-bottom:14px;font-weight:600;}
.footer-links{display:flex;flex-direction:column;gap:10px;font-size:14px;color:var(--text-2);}
.footer-links a:hover{color:var(--brand);}
.footer-contact{display:flex;flex-direction:column;gap:10px;font-size:14px;color:var(--text-2);}
.footer-bottom{
  margin-top:40px;padding-top:20px;border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;
  font-size:13px;color:var(--text-3);
}

/* 回到顶部 */
.to-top{
  position:fixed;right:18px;bottom:18px;z-index:70;
  width:44px;height:44px;border-radius:12px;border:1px solid rgba(31,224,180,.4);
  background:var(--bg-2);color:var(--brand);cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  opacity:0;visibility:hidden;transition:opacity .2s ease-out,visibility .2s ease-out,transform .2s ease-out;
}
.to-top.show{opacity:1;visibility:visible;}
.to-top:hover{transform:translateY(-2px);box-shadow:0 12px 24px -16px rgba(31,224,180,.9);}
@media(prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important;}
}

/* roulang page: article */
:root{
  --bg-0:#0A0D11;--bg-1:#10151B;--bg-2:#171E26;
  --brand:#1FE0B4;--brand-lite:#4CFFD0;--brand-dark:#0E9C7C;
  --accent:#FF7A2F;--lime:#C8FF4D;
  --text-1:#E9EFF5;--text-2:#9DAAB8;--text-3:#68747F;
  --line:rgba(255,255,255,.08);--line-strong:rgba(255,255,255,.18);
  --radius-card:14px;--radius-btn:10px;--radius-img:12px;
  --ease:cubic-bezier(.2,.7,.3,1);
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
.site-body{
  margin:0;background:var(--bg-0);color:var(--text-1);
  font-family:"PingFang SC","HarmonyOS Sans","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
  font-size:16px;line-height:1.85;-webkit-font-smoothing:antialiased;overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
ul,ol{margin:0;padding:0;}
h1,h2,h3{margin:0;font-weight:700;line-height:1.35;}
p{margin:0;}
.num{font-variant-numeric:tabular-nums;letter-spacing:.02em;}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px;}
@media(min-width:768px){.container{padding:0 24px;}}
@media(min-width:1024px){.container{padding:0 32px;}}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:60;background:rgba(10,13,17,.86);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);}
.site-header::after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:linear-gradient(90deg,var(--brand),rgba(31,224,180,.14) 48%,transparent);}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:64px;}
@media(min-width:1024px){.header-inner{min-height:72px;}}
.logo{display:flex;align-items:center;gap:10px;flex:0 0 auto;}
.logo-mark{position:relative;width:28px;height:28px;flex:0 0 28px;border:1px solid var(--brand);border-radius:8px;box-shadow:0 0 18px -4px rgba(31,224,180,.7);}
.logo-mark::after{content:"";position:absolute;inset:8px;border-radius:3px;background:linear-gradient(135deg,var(--brand),var(--brand-dark));}
.logo-text{display:flex;flex-direction:column;line-height:1.12;}
.logo-line1{font-size:14px;font-weight:600;letter-spacing:.02em;}
.logo-line2{font-size:12px;font-weight:700;color:var(--brand);letter-spacing:.08em;}
@media(min-width:768px){.logo-line1{font-size:15px;}.logo-line2{font-size:12.5px;}}
.main-nav{display:none;}
@media(min-width:1024px){.main-nav{display:flex;align-items:center;gap:4px;}}
.nav-link{position:relative;padding:8px 12px;font-size:15px;color:var(--text-2);border-radius:8px;transition:color .2s var(--ease);}
.nav-link:hover{color:var(--brand-lite);}
.nav-link.active{color:var(--text-1);}
.nav-link.active::before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:4px;height:4px;border-radius:50%;background:var(--brand);box-shadow:0 0 10px 2px rgba(31,224,180,.7);}
.nav-link.active::after{content:"";position:absolute;left:12px;right:12px;bottom:0;height:2px;border-radius:2px;background:var(--brand);box-shadow:0 0 12px rgba(31,224,180,.85);}
.header-actions{display:flex;align-items:center;gap:10px;}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 20px;border:1px solid transparent;border-radius:var(--radius-btn);font-size:15px;font-weight:600;white-space:nowrap;
  transition:transform .2s var(--ease),box-shadow .2s var(--ease),background-color .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease);}
.btn-primary{background:var(--brand);color:#052019;box-shadow:0 10px 24px -14px rgba(31,224,180,.95);}
.btn-primary:hover{background:#3EEBC3;transform:translateY(-1px);box-shadow:0 14px 30px -14px rgba(31,224,180,1);}
.btn-primary:active{transform:translateY(1px);}
.btn-ghost{border-color:rgba(255,255,255,.18);background:transparent;color:var(--text-1);}
.btn-ghost:hover{border-color:var(--brand);background:rgba(31,224,180,.08);color:var(--brand-lite);}
.btn-sm{padding:9px 16px;font-size:14px;}
.btn:focus-visible,a:focus-visible,button:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px;}
.menu-toggle{display:inline-flex;flex-direction:column;justify-content:center;gap:5px;width:40px;height:40px;padding:0 9px;border:1px solid var(--line-strong);border-radius:10px;}
.menu-toggle span{display:block;height:2px;border-radius:2px;background:var(--text-1);transition:transform .2s var(--ease),opacity .2s var(--ease);}
.menu-toggle span:nth-child(2){width:70%;}
.menu-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.menu-toggle[aria-expanded="true"] span:nth-child(2){opacity:0;}
.menu-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}
@media(min-width:1024px){.menu-toggle{display:none;}}

/* ---------- drawer ---------- */
.mobile-drawer{position:fixed;inset:64px 0 0;z-index:55;display:flex;flex-direction:column;justify-content:space-between;
  padding:8px 20px 28px;background:var(--bg-0);background-image:repeating-linear-gradient(115deg,rgba(31,224,180,.06) 0 2px,transparent 2px 22px);
  opacity:0;visibility:hidden;transform:translateY(-8px);transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s;}
.mobile-drawer.open{opacity:1;visibility:visible;transform:none;}
.drawer-nav{display:flex;flex-direction:column;}
.drawer-nav a{display:flex;align-items:center;height:56px;padding:0 4px;border-bottom:1px solid var(--line);font-size:16px;color:var(--text-1);transition:color .2s var(--ease);}
.drawer-nav a:hover{color:var(--brand-lite);}
.drawer-nav a.active{color:var(--brand);}
@media(min-width:1024px){.mobile-drawer{display:none;}}

/* ---------- breadcrumb & hero ---------- */
.crumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding:22px 0 0;font-size:14px;color:var(--text-3);}
.crumb a{color:var(--text-2);transition:color .2s var(--ease);}
.crumb a:hover{color:var(--brand);}
.crumb .sep{opacity:.55;}
.crumb .current{max-width:40ch;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--text-2);}
.article-hero{position:relative;padding:24px 0 34px;border-bottom:1px solid var(--line);margin-bottom:34px;}
.article-hero::before{content:"";position:absolute;right:-20px;top:-10px;width:280px;height:200px;pointer-events:none;
  background:radial-gradient(circle at 78% 12%,rgba(31,224,180,.15),transparent 68%);}
.badge{display:inline-flex;align-items:center;gap:6px;padding:5px 12px;border-radius:999px;font-size:12px;letter-spacing:.06em;
  background:rgba(31,224,180,.12);border:1px solid rgba(31,224,180,.28);color:var(--brand);}
.badge-lime{background:rgba(200,255,77,.1);border-color:rgba(200,255,77,.3);color:var(--lime);}
.article-title{margin-top:16px;font-size:clamp(26px,4.4vw,42px);line-height:1.25;letter-spacing:-.01em;max-width:26ch;}
.article-meta{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-top:18px;font-size:14px;color:var(--text-2);}
.article-meta .divider{display:inline-block;width:1px;height:14px;background:var(--line-strong);}

/* ---------- layout ---------- */
.layout{display:grid;grid-template-columns:1fr;gap:40px;padding-bottom:56px;}
@media(min-width:1024px){.layout{grid-template-columns:minmax(0,1fr) 300px;gap:48px;}}
.page-media{margin:0 0 24px;}
.page-media img{width:100%;height:280px;object-fit:cover;border-radius:var(--radius-img);border:1px solid var(--line);}
@media(max-width:640px){.page-media img{height:180px;}}
.notice{padding:16px 18px;margin:0 0 28px;border-left:3px solid var(--accent);border-radius:0 10px 10px 0;background:var(--bg-1);
  font-size:14px;line-height:1.8;color:var(--text-2);}

/* ---------- article body ---------- */
.article-body{max-width:760px;font-size:16px;line-height:1.85;color:#DCE5EC;}
.article-body h2{margin:2.2em 0 .8em;padding-left:14px;border-left:4px solid var(--brand);font-size:clamp(20px,2.6vw,26px);line-height:1.4;color:var(--text-1);}
.article-body h2:first-child{margin-top:0;}
.article-body h3{margin:1.8em 0 .6em;font-size:19px;font-weight:600;line-height:1.5;color:var(--text-1);}
.article-body p{margin:0 0 1.2em;}
.article-body ul,.article-body ol{list-style:none;margin:0 0 1.4em;padding:0;}
.article-body li{position:relative;margin-bottom:.6em;padding-left:20px;line-height:1.9;}
.article-body li::before{content:"";position:absolute;left:0;top:.72em;width:6px;height:6px;border-radius:2px;background:var(--brand);}
.article-body blockquote{margin:1.6em 0;padding:14px 18px;border-left:3px solid var(--brand);border-radius:0 10px 10px 0;background:var(--bg-1);font-size:15px;color:var(--text-2);}
.article-body img{max-width:100%;height:auto;margin:1.4em 0;border:1px solid var(--line);border-radius:var(--radius-img);}
.article-body figure{margin:1.6em 0;}
.article-body figcaption{margin-top:8px;font-size:13px;text-align:center;color:var(--text-3);}
.article-body table{width:100%;margin:1.6em 0;border-collapse:collapse;font-size:15px;}
.article-body th,.article-body td{padding:10px 12px;border:1px solid var(--line);text-align:left;}
.article-body th{background:var(--bg-2);color:var(--text-1);}
.article-body tbody tr:nth-child(odd){background:var(--bg-2);}
.article-body tbody tr:nth-child(even){background:var(--bg-1);}
.article-body a{color:var(--brand);border-bottom:1px solid rgba(31,224,180,.35);}
.article-body a:hover{color:var(--brand-lite);}
.article-body strong{color:#fff;font-weight:600;}
.article-body hr{margin:2em 0;border:0;border-top:1px solid var(--line);}

/* ---------- empty ---------- */
.empty-state{padding:48px 24px;border:1px dashed rgba(255,255,255,.22);border-radius:var(--radius-card);background:var(--bg-1);text-align:center;}
.empty-state strong{display:block;margin-bottom:10px;font-size:18px;}
.empty-state p{margin:0 0 20px;color:var(--text-2);font-size:15px;}

/* ---------- sidebar ---------- */
.sidebar{display:flex;flex-direction:column;gap:20px;}
@media(min-width:1024px){.sidebar{position:sticky;top:96px;align-self:start;}}
.panel{padding:20px;border:1px solid var(--line);border-radius:var(--radius-card);background:var(--bg-2);}
.panel-title{display:flex;align-items:center;gap:8px;margin:0 0 14px;font-size:15px;font-weight:700;}
.panel-title::before{content:"";width:3px;height:14px;border-radius:2px;background:var(--brand);box-shadow:0 0 10px rgba(31,224,180,.7);}
.toc-list{list-style:none;border-left:1px solid var(--line);}
.toc-list a{display:block;margin-left:-1px;padding:7px 0 7px 14px;border-left:2px solid transparent;font-size:14px;color:var(--text-2);
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;transition:color .2s var(--ease),border-color .2s var(--ease),padding-left .2s var(--ease);}
.toc-list a:hover,.toc-list a.active{color:var(--brand);border-left-color:var(--brand);padding-left:18px;}
.toc-list a.level-3{padding-left:26px;font-size:13px;}
.toc-empty{font-size:13px;color:var(--text-3);}
.side-links{display:flex;flex-direction:column;gap:2px;}
.side-links a{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 12px;border-radius:10px;font-size:14px;color:var(--text-2);
  border-left:3px solid transparent;transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);}
.side-links a:hover{background:var(--bg-1);color:var(--brand);border-left-color:var(--brand);}
.side-links span{color:var(--text-3);font-size:12px;}
.panel .btn{width:100%;}

/* ---------- related ---------- */
.related{padding:8px 0 56px;}
.section-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:12px;margin-bottom:22px;}
.section-head h2{font-size:clamp(20px,2.6vw,28px);}
.section-head .text-link{font-size:14px;color:var(--brand);}
.section-head .text-link:hover{color:var(--brand-lite);}
.card-grid{display:grid;grid-template-columns:1fr;gap:18px;}
@media(min-width:768px){.card-grid{grid-template-columns:repeat(2,1fr);}}
@media(min-width:1024px){.card-grid{grid-template-columns:repeat(3,1fr);}}
.card{display:flex;flex-direction:column;gap:10px;padding:22px;border:1px solid var(--line);border-radius:var(--radius-card);background:var(--bg-2);
  transition:transform .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);}
.card:hover{transform:translateY(-3px);border-color:rgba(31,224,180,.4);box-shadow:0 22px 44px -32px rgba(31,224,180,.85);}
.card h3{font-size:17px;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.card p{font-size:14px;line-height:1.75;color:var(--text-2);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.card .card-more{margin-top:auto;font-size:13px;letter-spacing:.04em;color:var(--brand);}

/* ---------- article foot ---------- */
.article-foot{display:flex;flex-wrap:wrap;gap:12px;margin-top:38px;padding-top:26px;border-top:1px solid var(--line);}

/* ---------- cta ---------- */
.cta-band{position:relative;overflow:hidden;margin:0 0 64px;padding:44px 26px;border:1px solid rgba(31,224,180,.35);border-radius:18px;background:var(--bg-1);text-align:center;}
.cta-band::before{content:"";position:absolute;inset:0;pointer-events:none;background:repeating-linear-gradient(115deg,rgba(31,224,180,.07) 0 1px,transparent 1px 26px);}
.cta-band h2{position:relative;font-size:clamp(20px,2.6vw,28px);}
.cta-band p{position:relative;max-width:560px;margin:12px auto 24px;font-size:15px;color:var(--text-2);}
.cta-band .btn{position:relative;}

/* ---------- footer ---------- */
.site-footer{position:relative;background:var(--bg-1);}
.site-footer::before{content:"";position:absolute;top:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,rgba(31,224,180,.55),transparent);}
.footer-grid{display:grid;grid-template-columns:1fr;gap:32px;padding:56px 0 36px;}
@media(min-width:768px){.footer-grid{grid-template-columns:repeat(2,1fr);}}
@media(min-width:1024px){.footer-grid{grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:40px;}}
.footer-desc{margin:16px 0 0;max-width:320px;font-size:14px;color:var(--text-2);}
.footer-title{margin:0 0 14px;font-size:15px;font-weight:600;}
.footer-links{display:flex;flex-direction:column;gap:10px;}
.footer-links a{font-size:14px;color:var(--text-2);transition:color .2s var(--ease);}
.footer-links a:hover{color:var(--brand);}
.footer-contact{display:flex;flex-direction:column;gap:10px;font-size:14px;color:var(--text-2);}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px;padding:18px 0 26px;border-top:1px solid var(--line);font-size:13px;color:var(--text-3);}

/* ---------- to top ---------- */
.to-top{position:fixed;right:20px;bottom:24px;z-index:40;display:flex;align-items:center;justify-content:center;width:44px;height:44px;
  border:1px solid var(--line-strong);border-radius:12px;background:var(--bg-2);color:var(--text-1);
  opacity:0;visibility:hidden;transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s,border-color .2s var(--ease),color .2s var(--ease);}
.to-top.show{opacity:1;visibility:visible;}
.to-top:hover{border-color:var(--brand);color:var(--brand);transform:translateY(-2px);}

@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{transition:none !important;animation:none !important;scroll-behavior:auto !important;}
}

/* roulang page: category3 */
:root{
  --bg-0:#0A0D11; --bg-1:#10151B; --bg-2:#171E26;
  --brand:#1FE0B4; --brand-bright:#4CFFD0; --brand-deep:#0E9C7C;
  --accent:#FF7A2F; --lime:#C8FF4D;
  --text:#E9EFF5; --text-2:#9DAAB8; --text-3:#68747F;
  --line:rgba(255,255,255,.08);
  --radius-card:14px; --radius-btn:10px; --radius-img:12px;
  --font-sans:"PingFang SC","HarmonyOS Sans","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-num:"SFMono-Regular",ui-monospace,"Roboto Mono","DIN Alternate",monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--bg-0);color:var(--text);
  font-family:var(--font-sans);font-size:16px;line-height:1.85;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
h1,h2,h3,h4{margin:0;font-weight:700;letter-spacing:.01em}
p{margin:0}
::selection{background:rgba(31,224,180,.28)}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px}
.num{font-family:var(--font-num);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
@media(min-width:768px){.container{padding:0 24px}}
@media(min-width:1024px){.container{padding:0 32px}}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:60;background:rgba(10,13,17,.86);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px)}
.site-header::after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:linear-gradient(90deg,var(--brand),rgba(31,224,180,.15) 55%,rgba(31,224,180,0))}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;height:64px}
@media(min-width:1024px){.header-inner{height:72px}}
.logo{display:flex;align-items:center;gap:10px;flex:none}
.logo-mark{position:relative;width:28px;height:28px;flex:none;border-radius:8px;border:1.5px solid var(--brand);box-shadow:inset 0 0 12px rgba(31,224,180,.35),0 0 10px rgba(31,224,180,.22)}
.logo-mark::after{content:"";position:absolute;inset:6px;border-radius:3px;background:var(--brand);opacity:.85}
.logo-text{display:flex;flex-direction:column;line-height:1.15}
.logo-line1{font-size:14px;font-weight:600;letter-spacing:.02em}
.logo-line2{font-size:12px;color:var(--brand);letter-spacing:.08em}
.main-nav{display:none}
@media(min-width:1024px){.main-nav{display:flex;align-items:center;gap:4px}}
.nav-link{position:relative;display:inline-block;padding:8px 12px;font-size:14.5px;color:var(--text-2);border-radius:8px;transition:color .2s ease-out}
.nav-link:hover{color:var(--brand)}
.nav-link::before{content:"";position:absolute;left:2px;top:50%;width:4px;height:4px;border-radius:50%;background:var(--brand);box-shadow:0 0 8px var(--brand);transform:translateY(-50%) scale(0);transition:transform .2s ease-out}
.nav-link.active{color:var(--text)}
.nav-link.active::before{transform:translateY(-50%) scale(1)}
.nav-link.active::after{content:"";position:absolute;left:12px;right:12px;bottom:0;height:2px;border-radius:2px;background:var(--brand);box-shadow:0 0 10px rgba(31,224,180,.75)}
.header-actions{display:flex;align-items:center;gap:12px}
.header-cta{display:none}
@media(min-width:768px){.header-cta{display:inline-flex}}
.menu-toggle{width:40px;height:40px;border-radius:10px;border:1px solid var(--line);display:grid;place-content:center;gap:4px;background:var(--bg-1)}
.menu-toggle span{display:block;width:18px;height:2px;border-radius:2px;background:var(--text)}
@media(min-width:1024px){.menu-toggle{display:none}}

/* ---------- drawer ---------- */
.mobile-drawer{position:fixed;inset:0;z-index:80;display:flex;flex-direction:column;background:var(--bg-0);transform:translateY(-100%);opacity:0;visibility:hidden;transition:transform .22s ease-out,opacity .22s ease-out,visibility .22s}
.mobile-drawer.open{transform:none;opacity:1;visibility:visible}
.mobile-drawer::before{content:"";position:absolute;inset:0;background:repeating-linear-gradient(115deg,rgba(31,224,180,.06) 0 2px,transparent 2px 16px);pointer-events:none}
.drawer-top{position:relative;display:flex;align-items:center;justify-content:space-between;height:64px;padding:0 20px;border-bottom:1px solid var(--line)}
.drawer-close{width:40px;height:40px;border-radius:10px;border:1px solid var(--line);display:grid;place-items:center;font-size:18px}
.drawer-nav{position:relative;display:flex;flex-direction:column;padding:8px 0}
.drawer-nav a{padding:0 20px;line-height:56px;font-size:16px;color:var(--text-2);border-bottom:1px solid var(--line)}
.drawer-nav a.active{color:var(--brand);background:rgba(31,224,180,.06)}
.drawer-foot{position:relative;margin-top:auto;padding:20px;border-top:1px solid var(--line)}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 22px;border-radius:var(--radius-btn);font-size:15px;font-weight:600;border:1px solid transparent;transition:transform .18s ease-out,box-shadow .18s ease-out,background-color .18s ease-out,border-color .18s ease-out,color .18s ease-out}
.btn-sm{padding:9px 16px;font-size:14px}
.btn-primary{background:var(--brand);color:#08120F;box-shadow:0 6px 20px rgba(31,224,180,.18)}
.btn-primary:hover{transform:translateY(-1px);background:var(--brand-bright);box-shadow:0 8px 26px rgba(31,224,180,.32)}
.btn-primary:active{transform:translateY(1px)}
.btn-ghost{background:transparent;color:var(--text);border-color:rgba(255,255,255,.18)}
.btn-ghost:hover{border-color:var(--brand);background:rgba(31,224,180,.08);color:var(--brand)}
.btn-ghost:active{transform:translateY(1px)}

/* ---------- badges ---------- */
.badge{display:inline-flex;align-items:center;gap:6px;padding:4px 12px;border-radius:999px;font-size:12px;letter-spacing:.06em;background:rgba(31,224,180,.12);color:var(--brand);border:1px solid rgba(31,224,180,.25)}
.badge-lime{background:rgba(200,255,77,.1);color:var(--lime);border-color:rgba(200,255,77,.32)}
.date-tag{display:inline-flex;align-items:center;padding:3px 10px;border-radius:999px;font-size:12px;border:1px solid rgba(200,255,77,.4);color:var(--lime);font-family:var(--font-num);font-variant-numeric:tabular-nums}

/* ---------- hero ---------- */
.page-hero{position:relative;overflow:hidden;background:var(--bg-1);border-bottom:1px solid var(--line)}
.page-hero-bg{position:absolute;inset:0;background-image:url(/assets/images/backpic/back-2.webp);background-size:cover;background-position:center;opacity:.26}
.page-hero::after{content:"";position:absolute;inset:0;background:radial-gradient(120% 90% at 12% 10%,rgba(31,224,180,.14),transparent 55%),linear-gradient(180deg,rgba(10,13,17,.45),rgba(10,13,17,.96))}
.hero-inner{position:relative;z-index:2;display:grid;gap:32px;padding:48px 0 32px;align-items:center}
@media(min-width:1024px){.hero-inner{grid-template-columns:1.15fr .85fr;padding:72px 0 48px;gap:48px}}
.breadcrumb{display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-size:14px;color:var(--text-3);margin-bottom:18px}
.breadcrumb a{color:var(--text-2)}
.breadcrumb a:hover{color:var(--brand)}
.breadcrumb .sep{color:var(--text-3)}
.hero-copy h1{margin:14px 0 0;font-size:clamp(28px,4.6vw,44px);line-height:1.25;font-weight:700}
.hero-desc{margin-top:16px;max-width:660px;color:var(--text-2);font-size:16px;line-height:1.85}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}
.hero-figure{position:relative;border-radius:var(--radius-img);overflow:hidden;border:1px solid var(--line);box-shadow:0 20px 44px rgba(0,0,0,.45),0 0 26px rgba(31,224,180,.1)}
.hero-figure img{width:100%;height:100%;object-fit:cover;aspect-ratio:16/11}
.hero-metrics{position:relative;z-index:2;display:grid;grid-template-columns:1fr;gap:12px;padding:0 0 36px}
@media(min-width:640px){.hero-metrics{grid-template-columns:repeat(3,1fr)}}
.metric{display:flex;flex-direction:column;gap:2px;padding:14px 16px;border-radius:12px;background:rgba(23,30,38,.7);border:1px solid var(--line)}
.metric .metric-num{font-size:22px;font-weight:700;color:var(--brand)}
.metric .metric-label{font-size:13px;color:var(--text-2)}

/* ---------- sections ---------- */
.section{padding:64px 0}
@media(min-width:768px){.section{padding:88px 0}}
@media(min-width:1024px){.section{padding:112px 0}}
.section-tight{padding:56px 0}
@media(min-width:768px){.section-tight{padding:72px 0}}
.section-head{max-width:760px;margin-bottom:32px}
.eyebrow{display:block;font-size:12px;letter-spacing:.16em;color:var(--brand);margin-bottom:10px}
.section-head h2{font-size:clamp(22px,3vw,32px);line-height:1.35}
.section-head p{margin-top:12px;color:var(--text-2);font-size:15px;line-height:1.8}
.section-alt{background:var(--bg-1);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}

/* ---------- timeline ---------- */
.timeline{position:relative;display:grid;gap:22px;margin-top:8px}
.timeline::before{content:"";position:absolute;left:19px;top:12px;bottom:12px;width:1px;background:linear-gradient(180deg,rgba(31,224,180,.65),rgba(31,224,180,0))}
.step{position:relative;padding-left:60px}
.step-num{position:absolute;left:0;top:0;width:40px;height:40px;border-radius:12px;display:grid;place-items:center;font-family:var(--font-num);font-weight:700;font-size:15px;color:var(--brand);background:var(--bg-2);border:1px solid rgba(31,224,180,.35);box-shadow:0 0 14px rgba(31,224,180,.12)}
.step h3{font-size:19px;font-weight:600;line-height:1.5}
.step p{margin-top:6px;color:var(--text-2);font-size:15px;line-height:1.8}
@media(min-width:1024px){.timeline{grid-template-columns:1fr 1fr;gap:28px 40px}.timeline::before{display:none}}

/* ---------- cards ---------- */
.card-grid{display:grid;gap:20px}
@media(min-width:768px){.card-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.card-grid-4{grid-template-columns:repeat(4,1fr)}}
.card{display:flex;flex-direction:column;gap:12px;padding:22px;border-radius:var(--radius-card);background:var(--bg-2);border:1px solid var(--line);transition:transform .2s ease-out,border-color .2s ease-out,box-shadow .2s ease-out}
.card:hover{transform:translateY(-3px);border-color:rgba(31,224,180,.4);box-shadow:0 14px 30px rgba(0,0,0,.4),0 0 20px rgba(31,224,180,.1)}
.card-icon{width:42px;height:42px;border-radius:12px;display:grid;place-items:center;background:rgba(31,224,180,.1);border:1px solid rgba(31,224,180,.3);color:var(--brand);font-family:var(--font-num);font-weight:700}
.card h3{font-size:18px;font-weight:600}
.card p{color:var(--text-2);font-size:15px;line-height:1.8}

/* ---------- media list ---------- */
.media-grid{display:grid;gap:20px}
@media(min-width:1024px){.media-grid{grid-template-columns:repeat(2,1fr);gap:24px}}
.media-card{display:grid;gap:16px;padding:16px;border-radius:var(--radius-card);background:var(--bg-2);border:1px solid var(--line);transition:transform .2s ease-out,border-color .2s ease-out,box-shadow .2s ease-out}
.media-card:hover{transform:translateY(-3px);border-color:rgba(31,224,180,.4);box-shadow:0 14px 30px rgba(0,0,0,.4)}
@media(min-width:640px){.media-card{grid-template-columns:190px 1fr;align-items:center}}
.media-thumb{border-radius:var(--radius-img);overflow:hidden;border:1px solid var(--line)}
.media-thumb img{width:100%;height:100%;aspect-ratio:4/3;object-fit:cover}
.media-body{display:flex;flex-direction:column;gap:8px}
.media-meta{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.media-body h3{font-size:17px;font-weight:600;line-height:1.5}
.media-body p{color:var(--text-2);font-size:14.5px;line-height:1.8}
.media-link{margin-top:2px;font-size:14px;color:var(--brand);display:inline-flex;align-items:center;gap:6px}
.media-link:hover{color:var(--brand-bright)}

/* ---------- stats band ---------- */
.stats-band{position:relative;overflow:hidden;background:var(--bg-1);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.stats-band::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.06) 1px,transparent 1px);background-size:44px 44px;opacity:.5;pointer-events:none}
.stats-inner{position:relative;display:grid;gap:24px;padding:56px 0}
@media(min-width:640px){.stats-inner{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.stats-inner{grid-template-columns:repeat(4,1fr);padding:64px 0}}
.stat{display:flex;flex-direction:column;gap:6px}
.stat-num{font-family:var(--font-num);font-variant-numeric:tabular-nums;font-size:clamp(30px,4vw,40px);font-weight:700;line-height:1.1;color:var(--brand)}
.stat:nth-child(2n) .stat-num{color:var(--lime)}
.stat-label{font-size:14px;color:var(--text-2)}

/* ---------- faq ---------- */
.faq-list{max-width:820px}
.faq-item{background:var(--bg-1);border:1px solid var(--line);border-radius:12px;margin-bottom:12px;overflow:hidden;transition:border-color .2s ease-out}
.faq-item:hover{border-color:rgba(255,255,255,.16)}
.faq-item.open{border-color:rgba(31,224,180,.42)}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 20px;text-align:left;font-size:16px;font-weight:600;line-height:1.6}
.faq-q .chev{flex:none;width:22px;height:22px;border-radius:6px;border:1px solid var(--line);display:grid;place-items:center;font-size:13px;color:var(--text-2);transition:transform .2s ease-out,color .2s ease-out,border-color .2s ease-out}
.faq-item.open .faq-q{color:var(--brand)}
.faq-item.open .chev{transform:rotate(45deg);color:var(--brand);border-color:rgba(31,224,180,.4)}
.faq-a{display:none;margin:0 20px 18px;padding-left:14px;border-left:3px solid var(--brand);color:var(--text-2);font-size:15px;line-height:1.8}
.faq-item.open .faq-a{display:block}

/* ---------- cta ---------- */
.cta-band{position:relative;overflow:hidden;border-radius:16px;border:1px solid rgba(31,224,180,.42);background:var(--bg-1);padding:36px 26px;text-align:center}
.cta-band::before{content:"";position:absolute;inset:-40% -12%;background:repeating-linear-gradient(115deg,rgba(31,224,180,.07) 0 2px,transparent 2px 16px);pointer-events:none}
.cta-band h2{position:relative;font-size:clamp(22px,3vw,30px);line-height:1.35}
.cta-band p{position:relative;margin:12px auto 0;max-width:620px;color:var(--text-2);font-size:15px}
.cta-band .btn{position:relative;margin-top:24px}

/* ---------- footer ---------- */
.site-footer{position:relative;background:var(--bg-1);border-top:1px solid var(--line);padding:56px 0 28px}
.site-footer::before{content:"";position:absolute;top:0;left:0;right:0;height:1px;background:linear-gradient(90deg,var(--brand),rgba(31,224,180,.12) 60%,rgba(31,224,180,0))}
.footer-grid{display:grid;gap:32px;grid-template-columns:1fr}
@media(min-width:768px){.footer-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.footer-grid{grid-template-columns:1.5fr 1fr 1fr 1.2fr}}
.footer-title{font-size:14px;font-weight:600;margin-bottom:14px;color:var(--text)}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-links a{font-size:14px;color:var(--text-2);transition:color .2s ease-out}
.footer-links a:hover{color:var(--brand)}
.footer-desc{margin-top:14px;max-width:320px;font-size:14px;line-height:1.8;color:var(--text-2)}
.footer-contact{display:flex;flex-direction:column;gap:10px;font-size:14px;color:var(--text-2)}
.footer-bottom{margin-top:36px;padding-top:20px;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;font-size:13px;color:var(--text-3)}

/* ---------- back top ---------- */
.back-top{position:fixed;right:20px;bottom:24px;z-index:70;width:44px;height:44px;border-radius:12px;background:var(--bg-2);border:1px solid rgba(31,224,180,.35);color:var(--brand);display:grid;place-items:center;opacity:0;visibility:hidden;transition:opacity .2s ease-out,visibility .2s ease-out,transform .2s ease-out}
.back-top.show{opacity:1;visibility:visible}
.back-top:hover{transform:translateY(-2px);box-shadow:0 0 20px rgba(31,224,180,.22)}
@media(prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important;scroll-behavior:auto!important}
}

/* roulang page: category2 */
:root{
  --bg-0:#0A0D11;
  --bg-1:#10151B;
  --bg-2:#171E26;
  --brand:#1FE0B4;
  --brand-lt:#4CFFD0;
  --brand-dk:#0E9C7C;
  --accent:#FF7A2F;
  --lime:#C8FF4D;
  --text:#E9EFF5;
  --muted:#9DAAB8;
  --faint:#68747F;
  --line:rgba(255,255,255,.08);
  --line-strong:rgba(255,255,255,.18);
  --r-card:14px;
  --r-btn:10px;
  --r-img:12px;
  --shadow:0 1px 0 rgba(255,255,255,.04),0 12px 32px rgba(0,0,0,.45);
  --glow:0 0 0 1px rgba(31,224,180,.35),0 10px 26px rgba(31,224,180,.14);
  --ease:cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--bg-0);
  color:var(--text);
  font-family:"PingFang SC","HarmonyOS Sans","Microsoft YaHei","Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.85;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none;transition:color .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease)}
button{font-family:inherit}
h1,h2,h3,h4,p{margin:0}
h1{font-size:clamp(28px,4.6vw,44px);line-height:1.25;font-weight:700}
h2{font-size:clamp(22px,3vw,32px);line-height:1.35;font-weight:700}
h3{font-size:19px;line-height:1.5;font-weight:600}
p{color:var(--muted)}
ul{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
@media (min-width:768px){.container{padding:0 24px}}
@media (min-width:1024px){.container{padding:0 32px}}
.tnum{font-variant-numeric:tabular-nums;font-feature-settings:"tnum";letter-spacing:.02em}

/* ============ header ============ */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(10,13,17,.86);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:linear-gradient(90deg,rgba(31,224,180,.85),rgba(31,224,180,.18) 38%,rgba(255,255,255,0) 100%);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:64px}
@media (min-width:1024px){.header-inner{min-height:72px}}
.logo{display:inline-flex;align-items:center;gap:10px}
.logo-mark{
  width:28px;height:28px;border-radius:8px;flex:0 0 28px;
  border:1px solid rgba(31,224,180,.7);
  background:
    radial-gradient(circle at 30% 30%,rgba(31,224,180,.55),rgba(31,224,180,0) 62%),
    linear-gradient(150deg,rgba(31,224,180,.16),rgba(10,13,17,0));
  box-shadow:0 0 14px rgba(31,224,180,.28) inset;
  position:relative;
}
.logo-mark::after{
  content:"";position:absolute;inset:8px;border-radius:3px;background:var(--brand);
  box-shadow:0 0 10px rgba(31,224,180,.75);
}
.logo-text{display:flex;flex-direction:column;line-height:1.12}
.logo-line1{font-size:15px;font-weight:700;color:var(--text)}
.logo-line2{font-size:11px;font-weight:600;color:var(--brand);letter-spacing:.08em}
.main-nav{display:none}
@media (min-width:1024px){.main-nav{display:flex;align-items:center;gap:4px}}
.nav-link{
  position:relative;display:inline-block;padding:10px 12px;border-radius:8px;
  font-size:14.5px;color:var(--muted);white-space:nowrap;
}
.nav-link:hover{color:var(--brand-lt);background:rgba(31,224,180,.06)}
.nav-link.active{color:var(--text)}
.nav-link.active::after{
  content:"";position:absolute;left:12px;right:12px;bottom:3px;height:2px;border-radius:2px;
  background:var(--brand);box-shadow:0 0 10px rgba(31,224,180,.85);
}
.nav-link.active::before{
  content:"";position:absolute;left:2px;top:50%;transform:translateY(-50%);
  width:4px;height:4px;border-radius:50%;background:var(--brand-lt);
  box-shadow:0 0 8px rgba(76,255,208,.9);
}
.header-actions{display:flex;align-items:center;gap:10px}
.header-cta{display:none}
@media (min-width:768px){.header-cta{display:inline-flex}}
.menu-toggle{
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;
  width:44px;height:44px;border-radius:10px;cursor:pointer;
  border:1px solid var(--line-strong);background:rgba(255,255,255,.02);
  transition:border-color .2s var(--ease),background-color .2s var(--ease);
}
.menu-toggle:hover{border-color:var(--brand);background:rgba(31,224,180,.08)}
.menu-toggle span{display:block;width:16px;height:2px;border-radius:2px;background:var(--text)}
@media (min-width:1024px){.menu-toggle{display:none}}

/* ============ buttons ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:var(--r-btn);border:1px solid transparent;
  font-size:14px;font-weight:600;line-height:1.4;cursor:pointer;white-space:nowrap;
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease),filter .18s var(--ease);
}
.btn-primary{background:var(--brand);color:#05130F;box-shadow:0 6px 18px rgba(31,224,180,.18)}
.btn-primary:hover{transform:translateY(-1px);filter:brightness(1.06);box-shadow:var(--glow)}
.btn-primary:active{transform:translateY(1px)}
.btn-ghost{background:transparent;border-color:var(--line-strong);color:var(--text)}
.btn-ghost:hover{border-color:var(--brand);background:rgba(31,224,180,.08);color:var(--brand-lt)}
.btn-sm{padding:9px 16px;font-size:13.5px}
.btn-link{display:inline-flex;align-items:center;gap:6px;color:var(--brand);font-weight:600;font-size:14px}
.btn-link:hover{color:var(--brand-lt)}

/* ============ tags / badge ============ */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 12px;border-radius:999px;font-size:12px;font-weight:600;
  letter-spacing:.06em;color:var(--brand);background:rgba(31,224,180,.12);
  border:1px solid rgba(31,224,180,.24);
}
.badge-lime{color:var(--lime);background:rgba(200,255,77,.08);border-color:rgba(200,255,77,.32)}
.kicker{display:inline-block;font-size:12.5px;letter-spacing:.06em;color:var(--brand);font-weight:600}

/* ============ hero ============ */
.page-hero{
  position:relative;overflow:hidden;border-bottom:1px solid var(--line);
  background-image:
    linear-gradient(102deg,rgba(10,13,17,.96) 0%,rgba(10,13,17,.86) 46%,rgba(10,13,17,.66) 100%),
    url('/assets/images/backpic/back-2.webp');
  background-size:cover;background-position:center;
}
.page-hero::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:repeating-linear-gradient(115deg,rgba(31,224,180,.05) 0 1px,transparent 1px 42px);
}
.page-hero-inner{
  position:relative;z-index:1;
  display:grid;gap:32px;align-items:center;
  padding:56px 0 56px;
}
@media (min-width:768px){.page-hero-inner{padding:72px 0}}
@media (min-width:1024px){
  .page-hero-inner{grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:48px;padding:88px 0}
}
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13.5px;color:var(--faint);margin-bottom:18px}
.breadcrumb a:hover{color:var(--brand-lt)}
.breadcrumb .sep{color:rgba(255,255,255,.22)}
.page-hero h1{margin:14px 0 18px;max-width:20em}
.lede{font-size:16px;line-height:1.85;color:var(--muted);max-width:660px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.hero-visual{
  position:relative;border-radius:var(--r-img);overflow:hidden;
  border:1px solid var(--line);box-shadow:var(--shadow);
}
.hero-visual img{width:100%;height:100%;object-fit:cover;aspect-ratio:4/3;filter:saturate(1.05)}
.hero-visual::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(10,13,17,.06),rgba(10,13,17,.62));
}
.hero-figure-tag{
  position:absolute;left:14px;bottom:14px;z-index:2;
  padding:6px 12px;border-radius:999px;font-size:12px;font-weight:600;
  color:var(--lime);background:rgba(10,13,17,.72);border:1px solid rgba(200,255,77,.4);
}

/* ============ sections ============ */
.section{padding:64px 0}
@media (min-width:768px){.section{padding:88px 0}}
@media (min-width:1024px){.section{padding:112px 0}}
.section-alt{background:var(--bg-1);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{display:flex;flex-wrap:wrap;gap:16px;align-items:flex-end;justify-content:space-between;margin-bottom:32px}
.section-head p{max-width:640px;font-size:15px;margin-top:10px}
.section-title{max-width:24em}

/* ============ feature cards ============ */
.feature-grid{display:grid;gap:16px;grid-template-columns:1fr}
@media (min-width:768px){.feature-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}}
.feature-card{
  display:flex;gap:16px;padding:22px;
  background:var(--bg-2);border:1px solid var(--line);border-radius:var(--r-card);
  transition:transform .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.feature-card:hover{transform:translateY(-3px);border-color:rgba(31,224,180,.4);box-shadow:0 12px 28px rgba(0,0,0,.4),0 0 0 1px rgba(31,224,180,.12)}
.feature-icon{
  flex:0 0 46px;width:46px;height:46px;border-radius:12px;display:grid;place-items:center;
  background:rgba(31,224,180,.1);border:1px solid rgba(31,224,180,.34);color:var(--brand);
}
.feature-icon svg{width:22px;height:22px;stroke:currentColor;fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.feature-body h3{margin-bottom:6px}
.feature-body p{font-size:14.5px;line-height:1.75;color:var(--muted);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* ============ wide media ============ */
.wide-media{margin:0;border-radius:var(--r-img);overflow:hidden;border:1px solid var(--line);position:relative;box-shadow:var(--shadow)}
.wide-media img{width:100%;height:100%;object-fit:cover;aspect-ratio:16/7}
.wide-media figcaption{
  position:absolute;left:0;right:0;bottom:0;padding:18px 22px;font-size:13.5px;color:var(--muted);
  background:linear-gradient(180deg,rgba(10,13,17,0),rgba(10,13,17,.88));
}
@media (max-width:520px){.wide-media figcaption{position:static;background:var(--bg-1);color:var(--muted)}}

/* ============ steps ============ */
.steps{display:grid;gap:22px;margin-top:8px}
@media (min-width:1024px){.steps{grid-template-columns:repeat(3,minmax(0,1fr));gap:28px}}
.step{position:relative;padding:24px 22px;background:var(--bg-2);border:1px solid var(--line);border-radius:var(--r-card)}
.step-num{font-size:30px;font-weight:700;line-height:1;color:var(--brand);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.step h3{margin:14px 0 8px}
.step p{font-size:14.5px;line-height:1.78}

/* ============ table ============ */
.table-wrap{border:1px solid var(--line);border-radius:var(--r-card);overflow-x:auto;background:var(--bg-1)}
table{width:100%;min-width:600px;border-collapse:collapse;font-size:14.5px}
thead th{background:var(--bg-2);color:var(--text);font-weight:600;text-align:left;padding:14px 18px;border-bottom:1px solid var(--line);white-space:nowrap}
tbody td{padding:14px 18px;border-bottom:1px solid var(--line);color:var(--muted);vertical-align:top}
tbody tr:last-child td{border-bottom:none}
tbody tr:nth-child(odd){background:rgba(23,30,38,.42)}
tbody tr:hover{background:rgba(31,224,180,.05)}
tbody td:first-child{color:var(--text);font-weight:600}

/* ============ stat strip ============ */
.stat-strip{
  display:grid;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;
  grid-template-columns:1fr;
}
@media (min-width:640px){.stat-strip{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (min-width:1024px){.stat-strip{grid-template-columns:repeat(4,minmax(0,1fr))}}
.stat{background:var(--bg-1);padding:26px 22px}
.stat-num{font-size:30px;font-weight:700;color:var(--brand);font-variant-numeric:tabular-nums;line-height:1.1}
.stat:nth-child(2n) .stat-num{color:var(--lime)}
.stat-label{margin-top:8px;font-size:14px;color:var(--muted);line-height:1.7}

/* ============ notes ============ */
.note{
  border:1px solid var(--line);border-left:3px solid var(--accent);
  background:linear-gradient(90deg,rgba(255,122,47,.08),rgba(255,122,47,0) 62%),var(--bg-2);
  border-radius:12px;padding:20px 22px;
}
.note h3{color:var(--text);font-size:16.5px;margin-bottom:8px}
.note p{font-size:14.5px}
.note-list{margin-top:12px;display:grid;gap:8px}
.note-list li{position:relative;padding-left:16px;font-size:14.5px;color:var(--muted)}
.note-list li::before{content:"";position:absolute;left:0;top:.72em;width:6px;height:6px;border-radius:2px;background:var(--accent)}

/* ============ faq ============ */
.faq-list{display:grid;gap:12px;max-width:900px}
.faq-item{border:1px solid var(--line);border-radius:var(--r-card);background:var(--bg-2);overflow:hidden;transition:border-color .2s var(--ease)}
.faq-item:hover{border-color:rgba(255,255,255,.18)}
.faq-item.is-open{border-color:rgba(31,224,180,.4)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px 20px;background:transparent;border:0;cursor:pointer;text-align:left;
  font-size:16px;font-weight:600;color:var(--text);line-height:1.6;
}
.faq-q .chev{
  flex:0 0 22px;width:22px;height:22px;border-radius:50%;display:grid;place-items:center;
  border:1px solid rgba(31,224,180,.4);color:var(--brand);font-size:12px;transition:transform .2s var(--ease),background-color .2s var(--ease);
}
.faq-item.is-open .chev{transform:rotate(180deg);background:rgba(31,224,180,.14)}
.faq-a{display:none;padding:0 20px 20px 20px;border-left:3px solid transparent}
.faq-item.is-open .faq-a{display:block;border-left-color:var(--brand)}
.faq-a p{font-size:15px;line-height:1.8}

/* ============ cta ============ */
.cta-band{
  position:relative;overflow:hidden;
  border:1px solid rgba(31,224,180,.45);background:var(--bg-1);
  border-radius:18px;padding:34px 26px;
  display:flex;flex-wrap:wrap;gap:22px;align-items:center;justify-content:space-between;
}
.cta-band::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(115deg,rgba(31,224,180,.06) 0 14px,transparent 14px 28px);
}
.cta-band > *{position:relative;z-index:1}
.cta-band h2{max-width:20em}
.cta-band p{margin-top:10px;font-size:15px;max-width:44em}
@media (min-width:768px){.cta-band{padding:44px 40px}}

/* ============ footer ============ */
.site-footer{background:var(--bg-1);position:relative;margin-top:0}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:0;height:1px;
  background:linear-gradient(90deg,rgba(31,224,180,.8),rgba(31,224,180,.14) 40%,rgba(255,255,255,0) 100%);
}
.footer-grid{display:grid;gap:32px;padding:56px 0 40px;grid-template-columns:1fr}
@media (min-width:768px){.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (min-width:1024px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr 1.1fr;gap:40px;padding:64px 0 44px}}
.footer-desc{margin-top:16px;font-size:14px;color:var(--muted);max-width:34em}
.footer-title{font-size:15px;font-weight:600;color:var(--text);margin-bottom:16px}
.footer-links{display:grid;gap:10px}
.footer-links a{font-size:14px;color:var(--muted)}
.footer-links a:hover{color:var(--brand-lt)}
.footer-contact{display:grid;gap:10px;font-size:14px;color:var(--muted)}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;align-items:center;
  border-top:1px solid var(--line);padding:20px 0 28px;font-size:13px;color:var(--faint);
}

/* ============ drawer ============ */
.mobile-drawer{
  position:fixed;inset:0;z-index:70;display:none;flex-direction:column;padding:20px;overflow-y:auto;
  background-color:var(--bg-0);
  background-image:repeating-linear-gradient(115deg,rgba(31,224,180,.06) 0 12px,transparent 12px 24px);
}
.mobile-drawer.is-open{display:flex}
@media (min-width:1024px){.mobile-drawer.is-open{display:none}}
.drawer-top{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-bottom:18px;border-bottom:1px solid var(--line)}
.drawer-close{
  width:44px;height:44px;border-radius:10px;cursor:pointer;font-size:20px;line-height:1;
  border:1px solid var(--line-strong);background:rgba(255,255,255,.02);color:var(--text);
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.drawer-close:hover{border-color:var(--brand);color:var(--brand-lt)}
.drawer-nav{display:flex;flex-direction:column;margin-top:8px}
.drawer-nav a{
  display:flex;align-items:center;min-height:56px;font-size:16px;color:var(--muted);
  border-bottom:1px solid var(--line);padding-left:12px;position:relative;
}
.drawer-nav a.active{color:var(--text)}
.drawer-nav a.active::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:3px;height:22px;border-radius:2px;background:var(--brand);box-shadow:0 0 10px rgba(31,224,180,.8);
}
.drawer-nav a:hover{color:var(--brand-lt)}
.drawer-foot{margin-top:auto;padding-top:24px}
.drawer-foot .btn{width:100%}

/* ============ back to top ============ */
.to-top{
  position:fixed;right:18px;bottom:18px;z-index:60;
  width:44px;height:44px;border-radius:12px;cursor:pointer;
  display:grid;place-items:center;font-size:16px;
  background:var(--bg-2);border:1px solid var(--line-strong);color:var(--brand);
  opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s var(--ease),border-color .2s var(--ease);
}
.to-top.is-visible{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{border-color:var(--brand);box-shadow:var(--glow)}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{transition:none !important;animation:none !important}
  .to-top{transform:none}
}

/* roulang page: category4 */
:root{
  --bg-0:#0A0D11;
  --bg-1:#10151B;
  --bg-2:#171E26;
  --brand:#1FE0B4;
  --brand-light:#4CFFD0;
  --brand-dark:#0E9C7C;
  --accent:#FF7A2F;
  --lime:#C8FF4D;
  --text:#E9EFF5;
  --text-2:#9DAAB8;
  --text-3:#68747F;
  --line:rgba(255,255,255,.08);
  --line-strong:rgba(255,255,255,.18);
  --radius-card:14px;
  --radius-btn:10px;
  --radius-img:12px;
  --shadow-card:0 1px 0 rgba(255,255,255,.04) inset, 0 14px 34px rgba(0,0,0,.45);
  --shadow-glow:0 0 0 1px rgba(31,224,180,.35), 0 12px 34px rgba(31,224,180,.12);
  --font-sans:"PingFang SC","HarmonyOS Sans","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --font-num:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg-0);
  color:var(--text);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;transition:color .2s ease-out;}
button{font-family:inherit;}
h1,h2,h3,h4,p,ul,ol,figure{margin:0;}
ul,ol{padding:0;list-style:none;}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:4px;}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px;}
@media(min-width:768px){.container{padding:0 24px;}}
@media(min-width:1024px){.container{padding:0 32px;}}

/* ============ header ============ */
.site-header{
  position:sticky;top:0;z-index:60;
  height:64px;
  background:rgba(10,13,17,.86);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;
  background:linear-gradient(90deg,var(--brand) 0%,rgba(31,224,180,.35) 28%,rgba(31,224,180,0) 62%);
  pointer-events:none;
}
.header-inner{height:100%;display:flex;align-items:center;gap:18px;}
.logo{display:flex;align-items:center;gap:10px;flex-shrink:0;}
.logo-mark{
  width:28px;height:28px;border-radius:8px;flex-shrink:0;
  border:1.5px solid var(--brand);
  background:linear-gradient(140deg,rgba(31,224,180,.28),rgba(31,224,180,0) 62%);
  box-shadow:0 0 12px rgba(31,224,180,.35);
  position:relative;
}
.logo-mark::after{
  content:"";position:absolute;inset:7px;border-radius:3px;
  background:var(--brand);opacity:.85;
}
.logo-text{display:flex;flex-direction:column;line-height:1.08;}
.logo-line1{font-size:14px;font-weight:700;letter-spacing:.01em;color:var(--text);}
.logo-line2{font-size:11px;font-weight:600;letter-spacing:.08em;color:var(--brand);}
.main-nav{display:none;align-items:center;gap:4px;margin-left:12px;}
.nav-link{
  position:relative;
  display:inline-flex;align-items:center;
  padding:8px 12px;
  font-size:14.5px;color:var(--text-2);
  border-radius:8px;
  transition:color .18s ease-out,background .18s ease-out;
}
.nav-link:hover{color:var(--brand);background:rgba(31,224,180,.06);}
.nav-link.active{color:var(--text);}
.nav-link.active::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:4px;height:4px;border-radius:50%;
  background:var(--brand);box-shadow:0 0 8px 2px rgba(31,224,180,.7);
}
.nav-link.active::after{
  content:"";position:absolute;left:12px;right:12px;bottom:2px;height:2px;
  background:var(--brand);border-radius:2px;box-shadow:0 0 10px rgba(31,224,180,.75);
}
.header-actions{margin-left:auto;display:flex;align-items:center;gap:10px;}
.menu-toggle{
  width:40px;height:40px;border-radius:10px;
  background:transparent;border:1px solid var(--line-strong);
  display:flex;flex-direction:column;justify-content:center;align-items:center;gap:4px;
  cursor:pointer;transition:border-color .18s ease-out,background .18s ease-out;
}
.menu-toggle span{display:block;width:16px;height:1.5px;background:var(--text);border-radius:2px;transition:transform .2s ease-out,opacity .2s ease-out;}
.menu-toggle:hover{border-color:var(--brand);background:rgba(31,224,180,.08);}
.menu-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(5.5px) rotate(45deg);}
.menu-toggle[aria-expanded="true"] span:nth-child(2){opacity:0;}
.menu-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-5.5px) rotate(-45deg);}

/* mobile drawer */
.mobile-drawer{
  position:fixed;inset:64px 0 0 0;z-index:55;
  background:
    repeating-linear-gradient(115deg,rgba(31,224,180,.06) 0 2px,rgba(31,224,180,0) 2px 14px),
    var(--bg-0);
  border-top:1px solid var(--line);
  padding:12px 20px 96px;
  display:flex;flex-direction:column;
  transform:translateY(-8px);opacity:0;pointer-events:none;
  transition:opacity .2s ease-out,transform .2s ease-out;
  overflow-y:auto;
}
.mobile-drawer.open{opacity:1;transform:translateY(0);pointer-events:auto;}
.drawer-link{
  display:flex;align-items:center;justify-content:space-between;
  min-height:56px;font-size:16px;color:var(--text-2);
  border-bottom:1px solid var(--line);
}
.drawer-link:hover,.drawer-link.active{color:var(--brand);}
.drawer-foot{margin-top:auto;padding-top:20px;}

/* ============ buttons ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border-radius:var(--radius-btn);
  padding:12px 22px;
  font-size:15px;font-weight:600;
  border:1px solid transparent;cursor:pointer;
  transition:transform .18s ease-out,box-shadow .18s ease-out,background .18s ease-out,border-color .18s ease-out,filter .18s ease-out;
  white-space:nowrap;
}
.btn-primary{background:var(--brand);color:#06110D;box-shadow:0 8px 22px rgba(31,224,180,.22);}
.btn-primary:hover{transform:translateY(-1px);filter:brightness(1.06);box-shadow:0 12px 30px rgba(31,224,180,.34);}
.btn-primary:active{transform:translateY(1px);}
.btn-ghost{background:transparent;border-color:var(--line-strong);color:var(--text);}
.btn-ghost:hover{border-color:var(--brand);background:rgba(31,224,180,.08);color:var(--brand-light);}
.btn-sm{padding:9px 16px;font-size:14px;}
.header-cta{display:none;}
@media(min-width:1024px){.header-cta{display:inline-flex;}}

/* ============ badges / tags ============ */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 12px;border-radius:999px;
  font-size:12px;letter-spacing:.06em;
  background:rgba(31,224,180,.12);color:var(--brand-light);
  border:1px solid rgba(31,224,180,.24);
}
.tag-time{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 10px;border-radius:999px;
  font-size:12px;letter-spacing:.06em;color:var(--lime);
  border:1px solid rgba(200,255,77,.35);
  background:rgba(200,255,77,.07);
  font-variant-numeric:tabular-nums;
}

/* ============ page hero ============ */
.page-hero{
  position:relative;
  padding:44px 0 40px;
  border-bottom:1px solid var(--line);
  background:
    radial-gradient(900px 320px at 12% -20%,rgba(31,224,180,.14),transparent 68%),
    var(--bg-1);
  overflow:hidden;
}
.page-hero::before{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:56px 56px;
  opacity:.35;pointer-events:none;
}
.page-hero .container{position:relative;z-index:2;}
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:14px;color:var(--text-3);}
.crumbs a:hover{color:var(--brand);}
.crumbs .sep{color:var(--text-3);opacity:.7;}
.hero-grid{display:grid;gap:28px;margin-top:20px;align-items:center;}
@media(min-width:1024px){.hero-grid{grid-template-columns:1.35fr .85fr;gap:44px;}}
.page-hero h1{
  font-size:clamp(28px,4.6vw,44px);
  line-height:1.25;font-weight:700;letter-spacing:.01em;
  margin:14px 0 16px;
}
.page-hero h1 em{font-style:normal;color:var(--brand);}
.hero-lead{font-size:16px;color:var(--text-2);max-width:56ch;}
.hero-figure{
  position:relative;border-radius:var(--radius-img);overflow:hidden;
  border:1px solid var(--line);
  box-shadow:var(--shadow-card);
}
.hero-figure img{width:100%;height:220px;object-fit:cover;}
@media(min-width:768px){.hero-figure img{height:280px;}}
.hero-figure figcaption{
  position:absolute;left:0;right:0;bottom:0;
  padding:22px 16px 12px;font-size:13px;color:var(--text-2);
  background:linear-gradient(to top,rgba(10,13,17,.92),rgba(10,13,17,0));
}
.hero-metrics{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  gap:12px;margin-top:26px;max-width:620px;
}
.metric{
  border:1px solid var(--line);background:var(--bg-2);
  border-radius:10px;padding:12px 14px;
}
.metric b{
  display:block;font-family:var(--font-num);font-size:20px;color:var(--brand);
  font-variant-numeric:tabular-nums;letter-spacing:.02em;
}
.metric span{font-size:12.5px;color:var(--text-3);}

/* ============ sections ============ */
.section{padding:64px 0;}
@media(min-width:768px){.section{padding:88px 0;}}
@media(min-width:1024px){.section{padding:112px 0;}}
.section-alt{background:var(--bg-1);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.section-head{max-width:760px;margin-bottom:36px;}
.section-head h2{
  font-size:clamp(22px,3vw,32px);line-height:1.35;font-weight:700;
  margin-bottom:12px;
}
.section-head p{color:var(--text-2);font-size:15.5px;}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12px;letter-spacing:.12em;color:var(--brand-light);
  text-transform:none;margin-bottom:10px;
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--brand);box-shadow:0 0 8px rgba(31,224,180,.7);}

/* ============ FAQ layout ============ */
.faq-layout{display:grid;gap:28px;}
@media(min-width:1024px){.faq-layout{grid-template-columns:minmax(0,1fr) 260px;gap:44px;align-items:start;}}
.faq-group + .faq-group{margin-top:44px;}
.faq-group-head{display:flex;align-items:baseline;gap:12px;margin-bottom:18px;}
.faq-group-head h3{font-size:19px;font-weight:600;line-height:1.5;}
.faq-group-head .count{
  font-family:var(--font-num);font-size:13px;color:var(--lime);
  letter-spacing:.06em;font-variant-numeric:tabular-nums;
}
.faq-group-head::after{
  content:"";flex:1;height:1px;
  background:linear-gradient(90deg,rgba(31,224,180,.4),rgba(31,224,180,0));
}
.faq-item{
  border-left:3px solid transparent;
  border-radius:0 var(--radius-card) var(--radius-card) 0;
  background:var(--bg-2);
  border-top:1px solid var(--line);
  border-right:1px solid var(--line);
  border-bottom:1px solid var(--line);
  margin-bottom:12px;
  transition:border-color .2s ease-out,background .2s ease-out,transform .2s ease-out;
}
.faq-item:hover{border-color:rgba(31,224,180,.35);}
.faq-item[open]{border-left-color:var(--brand);background:rgba(23,30,38,.9);}
.faq-item summary{
  list-style:none;cursor:pointer;
  display:flex;align-items:flex-start;gap:14px;
  padding:18px 20px;
  font-size:16px;font-weight:600;line-height:1.6;color:var(--text);
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{
  content:"+";margin-left:auto;flex-shrink:0;
  font-family:var(--font-num);font-size:20px;line-height:1;
  color:var(--brand);transition:transform .2s ease-out;
}
.faq-item[open] summary::after{content:"–";transform:rotate(180deg);}
.faq-item summary:hover{color:var(--brand-light);}
.faq-a{padding:0 20px 20px 20px;font-size:15px;line-height:1.8;color:var(--text-2);}
.faq-a strong{color:var(--text);font-weight:600;}
.faq-a p + p{margin-top:10px;}
.faq-a ul{margin-top:10px;}
.faq-a li{position:relative;padding-left:16px;margin-bottom:6px;}
.faq-a li::before{content:"";position:absolute;left:0;top:11px;width:5px;height:5px;background:var(--brand);border-radius:1px;}

/* sticky rail */
.faq-rail{display:none;}
@media(min-width:1024px){
  .faq-rail{display:block;position:sticky;top:96px;}
}
.rail-card{
  border:1px solid var(--line);background:var(--bg-2);
  border-radius:var(--radius-card);padding:18px;box-shadow:var(--shadow-card);
}
.rail-card h3{font-size:15px;font-weight:600;margin-bottom:12px;}
.rail-links a{
  display:block;font-size:14px;color:var(--text-2);
  padding:8px 10px;border-radius:8px;position:relative;
  transition:color .18s ease-out,background .18s ease-out;
}
.rail-links a:hover{color:var(--brand);background:rgba(31,224,180,.07);padding-left:14px;}
.rail-links a::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%) scaleY(0);
  width:3px;height:16px;background:var(--brand);border-radius:2px;
  transition:transform .18s ease-out;
}
.rail-links a:hover::before{transform:translateY(-50%) scaleY(1);}
.rail-top{
  margin-top:14px;width:100%;
}

/* ============ steps / checklist ============ */
.steps{display:grid;gap:14px;}
@media(min-width:768px){.steps{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;}}
.step{
  position:relative;border:1px solid var(--line);background:var(--bg-2);
  border-radius:var(--radius-card);padding:22px 22px 20px;
  transition:transform .2s ease-out,border-color .2s ease-out,box-shadow .2s ease-out;
}
.step:hover{transform:translateY(-3px);border-color:rgba(31,224,180,.4);box-shadow:var(--shadow-glow);}
.step-num{
  font-family:var(--font-num);font-size:26px;font-weight:700;
  color:var(--brand);letter-spacing:.02em;line-height:1;
  font-variant-numeric:tabular-nums;
}
.step h3{font-size:17px;font-weight:600;margin:12px 0 8px;}
.step p{font-size:14.5px;color:var(--text-2);}

/* ============ notice card (orange) ============ */
.notice-grid{display:grid;gap:16px;}
@media(min-width:768px){.notice-grid{grid-template-columns:repeat(3,minmax(0,1fr));}}
.notice{
  border:1px solid var(--line);
  border-left:3px solid var(--accent);
  background:var(--bg-2);
  border-radius:0 var(--radius-card) var(--radius-card) 0;
  padding:20px;
  transition:background .2s ease-out,transform .2s ease-out;
}
.notice:hover{transform:translateY(-3px);background:rgba(255,122,47,.06);}
.notice h3{font-size:16px;font-weight:600;margin-bottom:8px;}
.notice p{font-size:14.5px;color:var(--text-2);}

/* ============ CTA ============ */
.cta-band{
  position:relative;overflow:hidden;
  border:1px solid rgba(31,224,180,.45);
  border-radius:var(--radius-card);
  background:var(--bg-1);
  padding:36px 24px;
  text-align:center;
}
.cta-band::before{
  content:"";position:absolute;inset:0;
  background:repeating-linear-gradient(115deg,rgba(31,224,180,.10) 0 1px,rgba(31,224,180,0) 1px 12px);
  pointer-events:none;
}
.cta-band > *{position:relative;z-index:1;}
.cta-band h2{font-size:clamp(20px,2.6vw,28px);font-weight:700;margin-bottom:12px;}
.cta-band p{color:var(--text-2);font-size:15px;max-width:60ch;margin:0 auto 22px;}

/* ============ footer ============ */
.site-footer{
  position:relative;background:var(--bg-1);
  border-top:1px solid var(--line);
  padding:56px 0 26px;margin-top:0;
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;right:0;height:1px;
  background:linear-gradient(90deg,var(--brand) 0%,rgba(31,224,180,.3) 30%,rgba(31,224,180,0) 70%);
}
.footer-grid{display:grid;gap:30px;}
@media(min-width:768px){.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));}}
@media(min-width:1024px){.footer-grid{grid-template-columns:1.3fr 1fr 1fr 1fr;gap:36px;}}
.footer-desc{margin-top:16px;font-size:14px;color:var(--text-2);max-width:34ch;}
.footer-title{font-size:14px;font-weight:600;letter-spacing:.06em;color:var(--text);margin-bottom:14px;}
.footer-links{display:flex;flex-direction:column;gap:10px;}
.footer-links a{font-size:14px;color:var(--text-2);}
.footer-links a:hover{color:var(--brand);}
.footer-contact{display:flex;flex-direction:column;gap:10px;font-size:14px;color:var(--text-2);}
.footer-bottom{
  margin-top:40px;padding-top:20px;border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;gap:10px 20px;justify-content:space-between;
  font-size:13px;color:var(--text-3);
}

/* ============ back to top ============ */
.to-top{
  position:fixed;right:18px;bottom:22px;z-index:70;
  width:44px;height:44px;border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  background:var(--bg-2);border:1px solid var(--line-strong);color:var(--brand);
  cursor:pointer;opacity:0;pointer-events:none;
  transition:opacity .2s ease-out,transform .2s ease-out,border-color .2s ease-out;
}
.to-top.show{opacity:1;pointer-events:auto;}
.to-top:hover{transform:translateY(-2px);border-color:var(--brand);box-shadow:0 10px 24px rgba(31,224,180,.2);}

@media (prefers-reduced-motion: reduce){
  *{transition:none !important;animation:none !important;scroll-behavior:auto !important;}
}