/* roulang page: index */
:root{
  --ink-900:#070F18;
  --ink-800:#0B1524;
  --ink-700:#101D30;
  --brand-700:#0F3F63;
  --brand-500:#2A7FB8;
  --cloud-400:#35D6C0;
  --cloud-600:#1B9E92;
  --dawn-400:#FFB65C;
  --t-hi:#E9F1F8;
  --t-mid:#9FB3C8;
  --t-low:#6D829A;
  --line:rgba(255,255,255,.08);
  --glass:linear-gradient(180deg,rgba(255,255,255,.07),rgba(255,255,255,.02));
  --r-card:16px;
  --r-lg:24px;
  --r-badge:6px;
  --shadow-card:0 20px 60px rgba(4,10,20,.55), inset 0 1px 0 rgba(255,255,255,.06);
  --ease:cubic-bezier(.2,.7,.3,1);
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--ink-900);
  color:var(--t-hi);
  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;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button,input,select,textarea{font:inherit;color:inherit;}
ul,ol{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4{margin:0;font-weight:700;letter-spacing:.02em;line-height:1.25;}
p{margin:0;}
:focus-visible{outline:2px solid var(--cloud-400);outline-offset:2px;border-radius:4px;}

.container{
  width:100%;
  max-width:1200px;
  margin:0 auto;
  padding:0 32px;
}
@media (min-width:1440px){.container{max-width:1280px;}}
@media (max-width:1024px){.container{padding:0 24px;}}
@media (max-width:640px){.container{padding:0 16px;}}

.section{padding:96px 0;}
.section--tight{padding:76px 0;}
@media (max-width:1024px){.section{padding:72px 0;}.section--tight{padding:60px 0;}}
@media (max-width:640px){.section{padding:56px 0;}.section--tight{padding:48px 0;}}

.section-head{max-width:760px;margin-bottom:44px;}
.section-head h2{font-size:clamp(24px,2.8vw,36px);}
.section-head .lead{margin-top:14px;color:var(--t-mid);max-width:44ch;}

.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;letter-spacing:.14em;color:var(--cloud-400);
  text-transform:uppercase;margin-bottom:16px;
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--cloud-400);opacity:.7;}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  border-bottom:1px solid transparent;
  transition:background .3s var(--ease),border-color .3s var(--ease),backdrop-filter .3s var(--ease);
}
.site-header.is-stuck{
  background:rgba(7,15,24,.82);
  backdrop-filter:blur(12px) saturate(140%);
  border-bottom-color:var(--line);
}
.nav-grid{
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;
  gap:24px;height:76px;
}
.nav-left{display:flex;align-items:center;gap:28px;}
.nav-right{display:flex;align-items:center;gap:28px;justify-content:flex-end;}
.nav-link{
  position:relative;font-size:14.5px;color:var(--t-mid);
  padding:6px 0;transition:color .25s var(--ease);white-space:nowrap;
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;
  background:var(--cloud-400);transform:scaleX(0);transform-origin:left;
  transition:transform .3s var(--ease);
}
.nav-link:hover{color:var(--t-hi);}
.nav-link:hover::after{transform:scaleX(1);}
.nav-link.is-active{color:var(--t-hi);}
.nav-link.is-active::after{transform:scaleX(1);}

.logo{display:inline-flex;align-items:center;gap:10px;justify-self:center;}
.logo svg{width:30px;height:30px;flex:none;}
.logo-text{font-size:17px;font-weight:700;letter-spacing:.02em;color:var(--t-hi);white-space:nowrap;}
.logo-sub{font-size:11px;letter-spacing:.22em;color:var(--t-low);display:block;line-height:1;}

.nav-cta{
  display:inline-flex;align-items:center;height:38px;padding:0 18px;border-radius:999px;
  font-size:13.5px;font-weight:600;
  background:linear-gradient(180deg,var(--cloud-400),var(--cloud-600));
  color:#04212A;
  box-shadow:0 0 0 1px rgba(53,214,192,.45),0 12px 36px rgba(53,214,192,.28);
  transition:filter .25s var(--ease),box-shadow .25s var(--ease),transform .2s var(--ease);
}
.nav-cta:hover{filter:brightness(1.06);box-shadow:0 0 0 1px rgba(53,214,192,.55),0 16px 44px rgba(53,214,192,.36);}
.nav-cta:active{transform:translateY(1px);}
.nav-toggle{
  display:none;width:44px;height:44px;border:1px solid var(--line);border-radius:12px;
  background:rgba(255,255,255,.04);align-items:center;justify-content:center;cursor:pointer;
}
.nav-toggle span{display:block;width:18px;height:1.5px;background:var(--t-hi);position:relative;}
.nav-toggle span::before,.nav-toggle span::after{
  content:"";position:absolute;left:0;width:18px;height:1.5px;background:var(--t-hi);
}
.nav-toggle span::before{top:-6px;}
.nav-toggle span::after{top:6px;}
.mobile-panel{
  display:none;border-top:1px solid var(--line);
  background:rgba(7,15,24,.96);backdrop-filter:blur(14px);
}
.mobile-panel.is-open{display:block;}
.mobile-panel a{
  display:flex;align-items:center;min-height:52px;padding:0 24px;
  color:var(--t-mid);border-bottom:1px solid var(--line);font-size:15px;
}
.mobile-panel a.is-active{color:var(--t-hi);box-shadow:inset 3px 0 0 var(--cloud-400);}
.mobile-panel .mobile-cta{
  margin:16px 24px 22px;justify-content:center;color:#04212A;border:0;
  box-shadow:0 0 0 1px rgba(53,214,192,.45),0 12px 36px rgba(53,214,192,.28);
}
@media (max-width:1024px){
  .nav-grid{grid-template-columns:auto 1fr auto;height:68px;}
  .nav-left,.nav-right{display:none;}
  .logo{justify-self:start;}
  .nav-toggle{display:flex;}
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:50px;padding:0 26px;border-radius:999px;font-size:15px;font-weight:600;
  border:1px solid transparent;cursor:pointer;
  transition:filter .25s var(--ease),box-shadow .25s var(--ease),transform .2s var(--ease),background .25s var(--ease);
}
.btn-primary{
  background:linear-gradient(135deg,var(--cloud-400),var(--brand-500));
  color:#04212A;
  box-shadow:0 0 0 1px rgba(53,214,192,.45),0 12px 36px rgba(53,214,192,.28);
}
.btn-primary:hover{filter:brightness(1.06);box-shadow:0 0 0 1px rgba(53,214,192,.6),0 18px 48px rgba(53,214,192,.38);}
.btn-primary:active{transform:translateY(1px);}
.btn-ghost{
  background:var(--glass);border-color:var(--line);color:var(--t-hi);
  backdrop-filter:blur(14px) saturate(140%);
}
.btn-ghost:hover{background:rgba(255,255,255,.08);}
.btn-ghost:active{transform:translateY(1px);}
.btn-sm{height:42px;padding:0 20px;font-size:14px;}
.text-btn{
  display:inline-flex;align-items:center;gap:6px;color:var(--cloud-400);
  font-size:14px;font-weight:600;
}
.text-btn svg{transition:transform .3s var(--ease);}
.text-btn:hover svg{transform:translateX(4px);}

/* ---------- glass / card ---------- */
.glass{
  background:var(--glass);
  border:1px solid var(--line);
  backdrop-filter:blur(14px) saturate(140%);
}
.card{
  background:var(--glass);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  box-shadow:var(--shadow-card);
  backdrop-filter:blur(14px) saturate(140%);
  padding:26px;
  transition:transform .32s var(--ease),border-color .32s var(--ease),box-shadow .32s var(--ease);
}
.card:hover{transform:translateY(-4px);border-color:rgba(53,214,192,.35);}
.card h3{font-size:20px;margin-bottom:10px;}
.card p{color:var(--t-mid);font-size:15px;}

.badge{
  display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:var(--r-badge);
  font-size:12px;letter-spacing:.04em;color:var(--cloud-400);
  background:var(--glass);border:1px solid var(--line);
}
.badge-neutral{color:var(--t-mid);}

/* ---------- hero ---------- */
.hero{position:relative;padding:88px 0 96px;overflow:hidden;}
.hero::before{
  content:"";position:absolute;top:-220px;right:-160px;width:520px;height:520px;border-radius:50%;
  background:radial-gradient(circle,rgba(53,214,192,.10),rgba(53,214,192,0) 70%);
  pointer-events:none;
}
.hero::after{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);
  background-size:20px 20px;
  mask-image:linear-gradient(180deg,rgba(0,0,0,.9),transparent 78%);
  -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.9),transparent 78%);
  pointer-events:none;
}
.hero-grid{position:relative;z-index:2;display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;}
.hero h1{font-size:clamp(30px,4.4vw,52px);line-height:1.15;margin-bottom:20px;}
.hero .sub{color:var(--t-mid);font-size:17px;max-width:42ch;margin-bottom:32px;}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:44px;}
.hero-stats{display:flex;flex-wrap:wrap;gap:32px;}
.hero-stats .stat-num{font-size:26px;font-weight:700;color:var(--cloud-400);font-variant-numeric:tabular-nums;}
.hero-stats .stat-label{font-size:13px;color:var(--t-low);}
.hero-visual{position:relative;border-radius:var(--r-lg);overflow:hidden;border:1px solid var(--line);}
.hero-visual img{width:100%;height:440px;object-fit:cover;}
.hero-visual::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(90deg,rgba(7,15,24,.92),rgba(7,15,24,.35)),
             linear-gradient(180deg,rgba(7,15,24,0) 55%,rgba(7,15,24,.95) 100%);
}
.hero-float{
  position:absolute;z-index:3;left:24px;right:24px;bottom:24px;
  border-radius:var(--r-card);padding:18px 20px;box-shadow:var(--shadow-card);
  display:grid;grid-template-columns:1fr 1fr;gap:18px;
}
.hero-float .fh{font-size:12px;color:var(--t-low);margin-bottom:4px;}
.hero-float .fv{font-size:18px;font-weight:700;color:var(--dawn-400);font-variant-numeric:tabular-nums;}
@media (max-width:1024px){
  .hero{padding:64px 0 72px;}
  .hero-grid{grid-template-columns:1fr;gap:36px;}
  .hero-visual img{height:340px;}
}
@media (max-width:640px){
  .hero-float{position:static;left:auto;right:auto;bottom:auto;margin-top:16px;grid-template-columns:1fr 1fr;}
  .hero-visual{border:0;overflow:visible;}
  .hero-visual img{height:240px;border-radius:var(--r-card);border:1px solid var(--line);}
  .hero-visual::after{display:none;}
  .hero-stats{gap:22px;}
}

/* ---------- pain list ---------- */
.pain-row{
  display:grid;grid-template-columns:96px 1fr;gap:28px;align-items:start;
  padding:26px 0;border-bottom:1px solid var(--line);
}
.pain-row:first-of-type{border-top:1px solid var(--line);}
.pain-index{
  font-size:15px;font-weight:700;color:var(--cloud-400);letter-spacing:.1em;
  border-left:3px solid var(--cloud-400);padding-left:14px;line-height:1.4;
}
.pain-row h3{font-size:19px;margin-bottom:6px;}
.pain-row p{color:var(--t-mid);font-size:15px;max-width:52ch;}
@media (max-width:640px){
  .pain-row{grid-template-columns:1fr;gap:12px;}
}

/* ---------- solution ---------- */
.sol-grid{display:grid;grid-template-columns:7fr 5fr;gap:24px;align-items:stretch;}
.sol-main{
  border-radius:var(--r-lg);overflow:hidden;border:1px solid var(--line);
  background:var(--glass);box-shadow:var(--shadow-card);
  display:flex;flex-direction:column;
}
.sol-main img{width:100%;height:260px;object-fit:cover;transition:transform .32s var(--ease);}
.sol-main:hover img{transform:scale(1.04);}
.sol-main .body{padding:26px;}
.sol-main h3{font-size:22px;margin-bottom:14px;}
.point-list li{
  display:flex;gap:10px;align-items:flex-start;color:var(--t-mid);font-size:15px;padding:7px 0;
}
.point-list li::before{
  content:"";width:6px;height:6px;border-radius:50%;background:var(--cloud-400);
  margin-top:10px;flex:none;
}
.sol-side{display:grid;grid-template-rows:1fr 1fr;gap:24px;}
.sol-side .card{display:flex;flex-direction:column;justify-content:center;}
@media (max-width:1024px){
  .sol-grid{grid-template-columns:1fr;}
}

/* ---------- metrics ---------- */
.metrics{position:relative;overflow:hidden;border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.metrics::before{
  content:"";position:absolute;left:-180px;bottom:-220px;width:520px;height:520px;border-radius:50%;
  background:radial-gradient(circle,rgba(53,214,192,.10),rgba(53,214,192,0) 70%);
  pointer-events:none;
}
.metrics-grid{position:relative;z-index:2;display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}
.metric .num{
  font-size:clamp(32px,3.4vw,42px);font-weight:700;color:var(--dawn-400);
  letter-spacing:.01em;font-variant-numeric:tabular-nums;line-height:1.2;
}
.metric .cap{font-size:13px;color:var(--t-low);margin-top:8px;}
.metric .desc{color:var(--t-mid);font-size:14px;margin-top:6px;}
@media (max-width:1024px){.metrics-grid{grid-template-columns:repeat(2,1fr);}}
@media (max-width:640px){.metrics-grid{grid-template-columns:1fr;gap:28px;}}

/* ---------- quotes ---------- */
.quote-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:24px;}
.quote-card{position:relative;overflow:hidden;}
.quote-card .mark{
  position:absolute;top:-6px;right:18px;font-size:88px;line-height:1;
  color:rgba(53,214,192,.20);font-family:Georgia,serif;
}
.quote-card blockquote{margin:0;font-size:17px;line-height:1.8;color:var(--t-hi);}
.quote-card .who{margin-top:16px;font-size:13px;color:var(--t-low);display:flex;align-items:center;gap:10px;flex-wrap:wrap;}
.q-7{grid-column:span 7;}
.q-5{grid-column:span 5;}
.brand-note{grid-column:span 7;display:flex;flex-direction:column;justify-content:center;}
.brand-note h3{font-size:22px;margin-bottom:12px;}
.brand-note p{color:var(--t-mid);font-size:15px;max-width:44ch;}
@media (max-width:1024px){
  .q-7,.q-5,.brand-note{grid-column:span 12;}
}

/* ---------- news ---------- */
.news-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:40px;}
.news-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;}
.news-card{
  display:grid;grid-template-columns:180px 1fr;gap:0;overflow:hidden;
  border-radius:var(--r-card);border:1px solid var(--line);
  background:var(--glass);box-shadow:var(--shadow-card);
  backdrop-filter:blur(14px) saturate(140%);
  transition:transform .32s var(--ease),border-color .32s var(--ease);
}
.news-card:hover{transform:translateY(-4px);border-color:rgba(53,214,192,.35);}
.news-thumb{overflow:hidden;border-right:1px solid var(--line);}
.news-thumb img{width:100%;height:100%;min-height:150px;object-fit:cover;transition:transform .32s var(--ease);}
.news-card:hover .news-thumb img{transform:scale(1.04);}
.news-body{padding:20px 22px;display:flex;flex-direction:column;gap:8px;}
.news-body h3{
  font-size:17px;line-height:1.5;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.news-body .ex{
  color:var(--t-mid);font-size:14px;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.news-meta{display:flex;align-items:center;gap:12px;margin-top:auto;font-size:13px;color:var(--t-low);flex-wrap:wrap;}
.news-empty{
  text-align:center;padding:48px 24px;border-radius:var(--r-card);
}
.news-empty p{color:var(--t-mid);margin-bottom:18px;}
@media (max-width:1024px){
  .news-grid{grid-template-columns:1fr;}
}
@media (max-width:640px){
  .news-card{grid-template-columns:1fr;}
  .news-thumb{border-right:0;border-bottom:1px solid var(--line);}
  .news-thumb img{height:180px;min-height:0;}
}

/* ---------- faq ---------- */
.faq-wrap{border-radius:var(--r-lg);padding:12px 30px;box-shadow:var(--shadow-card);}
.faq-item{border-bottom:1px solid var(--line);}
.faq-item:last-child{border-bottom:0;}
.faq-q{
  width:100%;display:flex;align-items:center;gap:16px;text-align:left;
  background:none;border:0;cursor:pointer;padding:22px 0;color:var(--t-hi);
  font-size:16.5px;font-weight:600;
}
.faq-q .idx{font-size:13px;color:var(--cloud-400);letter-spacing:.1em;flex:none;}
.faq-q .icon{
  margin-left:auto;flex:none;width:22px;height:22px;position:relative;
  transition:transform .3s var(--ease);
}
.faq-q .icon::before,.faq-q .icon::after{
  content:"";position:absolute;background:var(--cloud-400);border-radius:2px;
}
.faq-q .icon::before{left:0;top:10px;width:22px;height:2px;}
.faq-q .icon::after{left:10px;top:0;width:2px;height:22px;transition:opacity .25s var(--ease);}
.faq-item.is-open .faq-q .icon{transform:rotate(180deg);}
.faq-item.is-open .faq-q .icon::after{opacity:0;}
.faq-a{display:none;padding:0 0 24px 38px;color:var(--t-mid);font-size:15.5px;line-height:1.9;max-width:72ch;}
.faq-item.is-open .faq-a{display:block;}
@media (max-width:640px){.faq-wrap{padding:6px 20px;}.faq-a{padding-left:0;}}

/* ---------- cta + form ---------- */
.cta-band{
  position:relative;overflow:hidden;border-radius:var(--r-lg);
  border:1px solid var(--line);
  background:var(--glass);
  box-shadow:var(--shadow-card);
  padding:48px;
}
.cta-band::before{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);
  background-size:20px 20px;pointer-events:none;
}
.cta-grid{position:relative;z-index:2;display:grid;grid-template-columns:5fr 7fr;gap:44px;align-items:start;}
.cta-copy h2{font-size:clamp(24px,2.6vw,32px);margin-bottom:16px;}
.cta-copy p{color:var(--t-mid);max-width:38ch;}
.cta-list{margin-top:24px;font-size:14px;color:var(--t-mid);}
.cta-list li{padding:6px 0;display:flex;gap:10px;}
.cta-list li::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--cloud-400);margin-top:10px;flex:none;}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;}
.field{display:flex;flex-direction:column;gap:8px;}
.field.full{grid-column:span 2;}
.field label{font-size:13px;color:var(--t-mid);}
.field input,.field select,.field textarea{
  background:rgba(255,255,255,.04);
  border:1px solid var(--line);
  border-radius:12px;
  height:48px;padding:0 14px;
  transition:border-color .25s var(--ease),box-shadow .25s var(--ease);
}
.field textarea{height:110px;padding:12px 14px;resize:vertical;line-height:1.7;}
.field select{appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--t-mid) 50%),linear-gradient(135deg,var(--t-mid) 50%,transparent 50%);
  background-position:calc(100% - 20px) 21px,calc(100% - 14px) 21px;background-size:6px 6px,6px 6px;background-repeat:no-repeat;}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:none;border-color:var(--cloud-400);box-shadow:0 0 0 4px rgba(53,214,192,.14);
}
.field.has-error input,.field.has-error select,.field.has-error textarea{border-color:#F2705E;}
.field .err{font-size:13px;color:#F2705E;display:none;}
.field.has-error .err{display:block;}
.check{display:flex;align-items:flex-start;gap:10px;font-size:13px;color:var(--t-mid);line-height:1.7;}
.check input{width:18px;height:18px;height:18px;margin-top:3px;accent-color:#35D6C0;flex:none;}
.form-note{font-size:12.5px;color:var(--t-low);}
@media (max-width:1024px){
  .cta-grid{grid-template-columns:1fr;gap:32px;}
}
@media (max-width:640px){
  .cta-band{padding:28px 20px;}
  .form-grid{grid-template-columns:1fr;}
  .field.full{grid-column:span 1;}
}

/* ---------- footer ---------- */
.site-footer{margin-top:0;border-top:1px solid var(--line);background:var(--ink-800);}
.footer-grid{
  display:grid;grid-template-columns:2fr 1fr 1fr 1.4fr;gap:36px;padding:64px 0 40px;
}
.footer-brand .logo{margin-bottom:16px;}
.footer-brand p{color:var(--t-mid);font-size:14px;max-width:32ch;}
.footer-title{font-size:14px;color:var(--cloud-400);margin-bottom:16px;letter-spacing:.04em;}
.footer-links li{padding:6px 0;}
.footer-links a{color:var(--t-mid);font-size:14px;transition:color .25s var(--ease);}
.footer-links a:hover{color:var(--t-hi);}
.footer-contact li{color:var(--t-mid);font-size:14px;padding:6px 0;}
.footer-bottom{
  border-top:1px solid var(--line);padding:22px 0;
  display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap;
  font-size:13px;color:var(--t-low);
}
.footer-bottom a{color:var(--t-low);}
.footer-bottom a:hover{color:var(--t-hi);}
.to-top{
  display:inline-flex;align-items:center;gap:6px;
  border:1px solid var(--line);border-radius:999px;padding:8px 16px;
  background:rgba(255,255,255,.04);color:var(--t-mid);font-size:13px;cursor:pointer;
  transition:background .25s var(--ease),color .25s var(--ease);
}
.to-top:hover{background:rgba(255,255,255,.08);color:var(--t-hi);}
@media (max-width:1024px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;padding:52px 0 32px;}
}
@media (max-width:640px){
  .footer-grid{grid-template-columns:1fr;}
}

/* ---------- motion ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .4s var(--ease),transform .4s var(--ease);}
.reveal.is-in{opacity:1;transform:none;}
@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important;}
  .reveal{opacity:1;transform:none;}
  html{scroll-behavior:auto;}
}

/* roulang page: article */
:root{
    --ink-900:#070F18;
    --ink-800:#0B1524;
    --ink-700:#101D30;
    --brand-700:#0F3F63;
    --brand-500:#2A7FB8;
    --cloud-400:#35D6C0;
    --cloud-600:#1B9E92;
    --dawn-400:#FFB65C;
    --t-hi:#E9F1F8;
    --t-mid:#9FB3C8;
    --t-low:#6D829A;
    --t-body:#C9D8E6;
    --line:rgba(255,255,255,.08);
    --line-strong:rgba(53,214,192,.35);
    --glass:linear-gradient(180deg, rgba(255,255,255,.07), rgba(255,255,255,.02));
    --r-card:16px;
    --r-lg:24px;
    --r-badge:6px;
    --shadow-card:0 20px 60px rgba(4,10,20,.55), inset 0 1px 0 rgba(255,255,255,.06);
    --container:1200px;
    --ease:cubic-bezier(.2,.7,.3,1);
  }

  *,*::before,*::after{box-sizing:border-box;}
  html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
  body{
    margin:0;
    background:var(--ink-900);
    color:var(--t-hi);
    font-family:"PingFang SC","HarmonyOS Sans","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
    font-size:16px;
    line-height:1.85;
    letter-spacing:.01em;
    overflow-x:hidden;
  }
  body::before{
    content:"";
    position:fixed;
    inset:0;
    z-index:0;
    pointer-events:none;
    background:
      radial-gradient(520px 520px at 88% -8%, rgba(53,214,192,.10), transparent 70%),
      radial-gradient(520px 520px at -12% 94%, rgba(53,214,192,.08), transparent 70%);
  }
  img{max-width:100%;display:block;border:0;}
  a{color:inherit;text-decoration:none;}
  button{font:inherit;color:inherit;}
  ul,ol{margin:0;padding:0;list-style:none;}
  h1,h2,h3,h4,p{margin:0;}
  :focus-visible{outline:2px solid var(--cloud-400);outline-offset:3px;border-radius:4px;}

  .container{width:100%;max-width:var(--container);margin:0 auto;padding:0 32px;}
  @media (min-width:1440px){ :root{ --container:1280px; } }
  @media (max-width:1024px){ .container{padding:0 24px;} }
  @media (max-width:640px){ .container{padding:0 16px;} }

  /* ---------- 顶部导航 ---------- */
  .site-header{
    position:sticky;
    top:0;
    z-index:60;
    background:rgba(7,15,24,.58);
    backdrop-filter:blur(12px) saturate(140%);
    border-bottom:1px solid transparent;
    transition:background .3s ease,border-color .3s ease;
  }
  .site-header.is-scrolled{
    background:rgba(7,15,24,.86);
    border-bottom-color:var(--line);
  }
  .header-inner{
    position:relative;
    display:flex;
    align-items:center;
    justify-content:flex-start;
    height:72px;
  }
  @media (min-width:1024px){
    .header-inner{display:grid;grid-template-columns:1fr auto 1fr;height:88px;}
  }
  .nav-left,.nav-right{display:none;}
  @media (min-width:1024px){
    .nav-left{display:flex;align-items:center;gap:26px;justify-self:start;}
    .nav-right{display:flex;align-items:center;gap:22px;justify-self:end;}
  }
  .nav-link{
    position:relative;
    font-size:14px;
    color:var(--t-mid);
    padding:6px 2px;
    white-space:nowrap;
    transition:color .25s ease;
  }
  .nav-link::after{
    content:"";
    position:absolute;
    left:0;right:0;bottom:-4px;
    height:2px;
    border-radius:2px;
    background:var(--cloud-400);
    transform:scaleX(0);
    transform-origin:left;
    transition:transform .28s var(--ease);
  }
  .nav-link:hover{color:var(--t-hi);}
  .nav-link:hover::after{transform:scaleX(1);}
  .nav-link.is-active{color:var(--t-hi);}
  .nav-link.is-active::after{transform:scaleX(1);}

  .logo{display:inline-flex;align-items:center;gap:10px;}
  @media (min-width:1024px){ .logo{justify-self:center;} }
  .logo svg{width:34px;height:34px;flex:none;}
  .logo-text{display:block;font-size:16px;font-weight:700;letter-spacing:.02em;line-height:1.15;}
  .logo-sub{display:block;font-size:10px;letter-spacing:.22em;color:var(--t-low);}

  .nav-toggle{
    position:absolute;
    right:16px;top:50%;
    transform:translateY(-50%);
    width:44px;height:44px;
    display:inline-flex;
    align-items:center;
    justify-content:center;
    background:transparent;
    border:1px solid var(--line);
    border-radius:12px;
    color:var(--t-hi);
    cursor:pointer;
    transition:background .25s ease,border-color .25s ease;
  }
  .nav-toggle:hover{background:rgba(255,255,255,.08);border-color:var(--line-strong);}
  @media (min-width:768px){ .nav-toggle{right:24px;} }
  @media (min-width:1024px){ .nav-toggle{display:none;} }
  .nav-toggle span{display:block;width:18px;height:2px;background:currentColor;border-radius:2px;position:relative;}
  .nav-toggle span::before,.nav-toggle span::after{
    content:"";position:absolute;left:0;width:18px;height:2px;background:currentColor;border-radius:2px;
    transition:transform .3s var(--ease),top .3s var(--ease);
  }
  .nav-toggle span::before{top:-6px;}
  .nav-toggle span::after{top:6px;}
  .nav-toggle.is-open span{background:transparent;}
  .nav-toggle.is-open span::before{top:0;transform:rotate(45deg);}
  .nav-toggle.is-open span::after{top:0;transform:rotate(-45deg);}

  .mobile-menu{display:none;}
  @media (max-width:1023px){
    .mobile-menu{
      display:block;
      position:absolute;
      top:100%;left:0;right:0;
      background:rgba(7,15,24,.96);
      backdrop-filter:blur(16px) saturate(140%);
      border-bottom:1px solid var(--line);
      overflow:hidden;
      max-height:0;
      opacity:0;
      pointer-events:none;
      transition:max-height .36s ease,opacity .28s ease;
    }
    .mobile-menu.is-open{max-height:560px;opacity:1;pointer-events:auto;}
    .mobile-nav{display:flex;flex-direction:column;padding:6px 16px 22px;}
    .m-link{
      display:flex;align-items:center;
      min-height:52px;
      font-size:15px;
      color:var(--t-mid);
      border-bottom:1px solid var(--line);
      transition:color .25s ease,padding-left .25s ease;
    }
    .m-link:hover,.m-link:active{color:var(--t-hi);padding-left:6px;}
    .mobile-nav .btn{margin-top:18px;width:100%;height:48px;}
  }

  /* ---------- 按钮 ---------- */
  .btn{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    gap:8px;
    height:46px;
    padding:0 24px;
    border-radius:999px;
    border:1px solid transparent;
    font-size:15px;
    font-weight:600;
    cursor:pointer;
    white-space:nowrap;
    transition:background .3s var(--ease),box-shadow .3s var(--ease),transform .2s var(--ease),border-color .3s var(--ease),filter .3s var(--ease);
  }
  .btn-primary{
    background:linear-gradient(135deg,var(--cloud-400),var(--brand-500));
    color:#06202A;
    box-shadow:0 0 0 1px rgba(53,214,192,.45), 0 12px 36px rgba(53,214,192,.28);
  }
  .btn-primary:hover{
    filter:brightness(1.06);
    box-shadow:0 0 0 1px rgba(53,214,192,.62), 0 18px 48px rgba(53,214,192,.40);
  }
  .btn-primary:active{transform:translateY(1px);}
  .btn-ghost{
    background:var(--glass);
    border-color:var(--line);
    color:var(--t-hi);
    backdrop-filter:blur(14px) saturate(140%);
  }
  .btn-ghost:hover{background:rgba(255,255,255,.08);border-color:var(--line-strong);}
  .btn-ghost:active{transform:translateY(1px);}
  .btn-text{
    display:inline-flex;align-items:center;gap:6px;
    background:none;border:0;padding:0;
    color:var(--cloud-400);
    font-size:14px;font-weight:600;
    cursor:pointer;
  }
  .btn-sm{height:38px;padding:0 18px;font-size:13px;}
  .btn-block{width:100%;}
  .arrow{transition:transform .3s var(--ease);color:var(--cloud-400);}
  .btn-text:hover .arrow,.side-links a:hover .arrow{transform:translateX(4px);}

  .badge{
    display:inline-flex;align-items:center;gap:6px;
    font-size:12px;letter-spacing:.04em;
    padding:4px 10px;
    border-radius:var(--r-badge);
    background:rgba(53,214,192,.10);
    border:1px solid rgba(53,214,192,.22);
    color:var(--cloud-400);
  }
  .badge-neutral{
    background:rgba(255,255,255,.05);
    border-color:var(--line);
    color:var(--t-mid);
  }

  /* ---------- 主区 ---------- */
  main{position:relative;z-index:1;}

  .breadcrumb{
    display:flex;
    flex-wrap:wrap;
    align-items:center;
    gap:8px;
    padding:26px 0 0;
    font-size:14px;
    color:var(--t-mid);
  }
  .breadcrumb a{transition:color .25s ease;}
  .breadcrumb a:hover{color:var(--cloud-400);}
  .breadcrumb .sep{color:var(--t-low);}
  .crumb-current{
    max-width:44ch;
    overflow:hidden;
    text-overflow:ellipsis;
    white-space:nowrap;
    color:var(--t-low);
  }

  .article-layout{
    display:grid;
    grid-template-columns:minmax(0,1fr);
    gap:40px;
    padding-top:24px;
    padding-bottom:72px;
  }
  @media (min-width:1024px){
    .article-layout{grid-template-columns:minmax(0,1fr) 300px;gap:56px;padding-bottom:88px;}
  }
  .article-main{min-width:0;}

  .article-head{padding-bottom:26px;border-bottom:1px solid var(--line);}
  .article-head h1{
    margin:16px 0 18px;
    font-size:clamp(28px,3.6vw,42px);
    line-height:1.25;
    font-weight:700;
    letter-spacing:.02em;
    max-width:24ch;
  }
  .meta-row{
    display:flex;
    flex-wrap:wrap;
    align-items:center;
    gap:12px;
    font-size:13px;
    color:var(--t-low);
  }
  .meta-row .dot{width:4px;height:4px;border-radius:50%;background:var(--t-low);display:inline-block;}

  .article-body{
    max-width:800px;
    margin-top:34px;
    color:var(--t-body);
    font-size:16px;
    line-height:1.9;
  }
  .article-body > *:first-child{margin-top:0;}
  .article-body p{margin:0 0 1.4em;}
  .article-body h2{
    position:relative;
    margin:2.2em 0 .9em;
    padding:20px 0 0 16px;
    font-size:clamp(20px,2.2vw,26px);
    line-height:1.35;
    font-weight:700;
    color:var(--t-hi);
    letter-spacing:.02em;
    border-top:1px solid var(--line);
  }
  .article-body h2::before{
    content:"";
    position:absolute;
    left:0;top:26px;
    width:4px;height:1.05em;
    border-radius:4px;
    background:var(--cloud-400);
  }
  .article-body h3{
    margin:1.8em 0 .6em;
    font-size:20px;
    font-weight:600;
    color:var(--t-hi);
  }
  .article-body h4{margin:1.5em 0 .5em;font-size:17px;font-weight:600;color:var(--t-hi);}
  .article-body a{
    color:var(--cloud-400);
    text-decoration:underline;
    text-underline-offset:3px;
    transition:color .25s ease;
  }
  .article-body a:hover{color:#5AE7D6;font-weight:600;}
  .article-body ul,.article-body ol{margin:0 0 1.4em;padding-left:1.4em;}
  .article-body ul li{list-style:disc;}
  .article-body ol li{list-style:decimal;}
  .article-body li{margin:.4em 0;line-height:1.8;}
  .article-body li::marker{color:var(--cloud-400);}
  .article-body blockquote{
    margin:1.6em 0;
    padding:18px 22px;
    background:var(--glass);
    border-left:2px solid var(--cloud-400);
    border-radius:0 12px 12px 0;
    color:var(--t-mid);
    backdrop-filter:blur(14px) saturate(140%);
  }
  .article-body img{
    width:auto;
    max-width:100%;
    margin:1.6em auto;
    border-radius:12px;
  }
  .article-body figure{margin:1.6em 0;}
  .article-body figcaption{
    margin-top:10px;
    text-align:center;
    font-size:13px;
    color:var(--t-low);
  }
  .article-body table{
    display:block;
    width:100%;
    margin:1.6em 0;
    border-collapse:collapse;
    overflow-x:auto;
    font-size:14px;
  }
  .article-body th,.article-body td{
    border:1px solid var(--line);
    padding:10px 14px;
    text-align:left;
    color:var(--t-mid);
  }
  .article-body thead th{background:rgba(255,255,255,.05);color:var(--t-hi);font-weight:600;}
  .article-body tbody tr:hover td{background:rgba(255,255,255,.03);}
  .article-body code{
    padding:2px 6px;
    border-radius:6px;
    background:rgba(255,255,255,.06);
    color:var(--cloud-400);
    font-size:14px;
  }
  .article-body hr{border:0;border-top:1px solid var(--line);margin:2.2em 0;}

  .empty-state{
    max-width:640px;
    margin:40px auto 0;
    padding:40px 28px;
    text-align:center;
    background:var(--glass);
    border:1px solid var(--line);
    border-radius:var(--r-card);
    box-shadow:var(--shadow-card);
    backdrop-filter:blur(14px) saturate(140%);
  }
  .empty-state h2{font-size:22px;font-weight:700;color:var(--t-hi);margin-bottom:12px;}
  .empty-state p{font-size:15px;color:var(--t-mid);margin-bottom:22px;line-height:1.85;}

  /* ---------- 侧栏 ---------- */
  .article-side{display:flex;flex-direction:column;gap:18px;min-width:0;}
  @media (min-width:1024px){
    .article-side{position:sticky;top:104px;align-self:start;}
  }
  .side-card{
    padding:20px;
    background:var(--glass);
    border:1px solid var(--line);
    border-radius:var(--r-card);
    box-shadow:var(--shadow-card);
    backdrop-filter:blur(14px) saturate(140%);
  }
  .side-card h3{
    margin-bottom:14px;
    font-size:14px;
    font-weight:600;
    letter-spacing:.04em;
    color:var(--cloud-400);
  }
  .toc{
    display:flex;
    flex-direction:column;
    gap:2px;
    max-height:320px;
    overflow:auto;
  }
  .toc a{
    display:block;
    padding:7px 10px;
    font-size:14px;
    color:var(--t-mid);
    border-left:2px solid transparent;
    border-radius:0 8px 8px 0;
    transition:color .25s ease,background .25s ease,border-color .25s ease;
  }
  .toc a:hover{color:var(--t-hi);background:rgba(255,255,255,.05);border-left-color:var(--cloud-400);}
  .toc-empty{font-size:13px;color:var(--t-low);line-height:1.8;}
  .side-links a{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:12px;
    padding:11px 0;
    font-size:14px;
    color:var(--t-mid);
    border-bottom:1px solid var(--line);
    transition:color .25s ease;
  }
  .side-links a:last-child{border-bottom:0;}
  .side-links a:hover{color:var(--t-hi);}

  /* ---------- 相关推荐 ---------- */
  .related{padding:8px 0 0;}
  .section-head{
    display:flex;
    align-items:flex-end;
    justify-content:space-between;
    gap:20px;
    margin-bottom:26px;
  }
  .section-head h2{
    font-size:clamp(22px,2.4vw,30px);
    font-weight:700;
    letter-spacing:.02em;
  }
  .section-head p{margin-top:8px;font-size:14px;color:var(--t-mid);}
  .related-grid{
    display:grid;
    grid-template-columns:1fr;
    gap:22px;
  }
  @media (min-width:768px){ .related-grid{grid-template-columns:repeat(3,1fr);} }
  .rcard{
    display:flex;
    flex-direction:column;
    background:var(--glass);
    border:1px solid var(--line);
    border-radius:var(--r-card);
    overflow:hidden;
    box-shadow:var(--shadow-card);
    backdrop-filter:blur(14px) saturate(140%);
    transition:transform .32s var(--ease),border-color .32s var(--ease);
  }
  .rcard:hover{transform:translateY(-4px);border-color:var(--line-strong);}
  .rcard-media{
    aspect-ratio:16/9;
    overflow:hidden;
    border-bottom:1px solid var(--line);
  }
  .rcard-media img{
    width:100%;height:100%;
    object-fit:cover;
    transition:transform .32s var(--ease);
  }
  .rcard:hover .rcard-media img{transform:scale(1.04);}
  .rcard-body{padding:20px 22px 24px;display:flex;flex-direction:column;gap:10px;}
  .rcard-body h3{font-size:17px;font-weight:600;line-height:1.5;color:var(--t-hi);}
  .rcard-body p{font-size:14px;line-height:1.8;color:var(--t-mid);}
  .rcard-meta{font-size:13px;color:var(--t-low);}

  /* ---------- 结尾 CTA ---------- */
  .cta-wrap{padding:72px 0 0;}
  @media (max-width:640px){ .cta-wrap{padding:56px 0 0;} }
  .cta-band{
    position:relative;
    overflow:hidden;
    display:flex;
    flex-wrap:wrap;
    align-items:center;
    justify-content:space-between;
    gap:26px;
    padding:44px 40px;
    border:1px solid var(--line);
    border-radius:var(--r-lg);
    background:linear-gradient(180deg, rgba(255,255,255,.07), rgba(255,255,255,.02)), var(--ink-800);
    box-shadow:var(--shadow-card);
  }
  .cta-band::after{
    content:"";
    position:absolute;
    inset:0;
    pointer-events:none;
    background-image:
      linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
    background-size:20px 20px;
  }
  .cta-band .cta-copy{position:relative;max-width:56ch;}
  .cta-band h2{
    font-size:clamp(22px,2.6vw,32px);
    font-weight:700;
    letter-spacing:.02em;
    margin-bottom:12px;
  }
  .cta-band p{font-size:15px;color:var(--t-mid);line-height:1.85;}
  .cta-actions{position:relative;display:flex;flex-wrap:wrap;gap:14px;align-items:center;}
  @media (max-width:640px){
    .cta-band{padding:32px 22px;}
    .cta-actions{width:100%;}
    .cta-actions .btn{flex:1 1 auto;}
  }

  /* ---------- 页脚 ---------- */
  .site-footer{
    position:relative;
    z-index:1;
    margin-top:96px;
    background:var(--ink-800);
    border-top:1px solid var(--line);
  }
  .footer-grid{
    display:grid;
    grid-template-columns:1fr;
    gap:36px;
    padding:64px 0 40px;
  }
  @media (min-width:640px){ .footer-grid{grid-template-columns:repeat(2,1fr);} }
  @media (min-width:1024px){ .footer-grid{grid-template-columns:1.3fr 1fr 1fr 1fr;} }
  .footer-brand p{
    margin-top:14px;
    font-size:14px;
    line-height:1.8;
    color:var(--t-mid);
    max-width:34ch;
  }
  .footer-title{
    margin-bottom:16px;
    font-size:14px;
    font-weight:600;
    letter-spacing:.04em;
    color:var(--cloud-400);
  }
  .footer-links,.footer-contact{
    display:flex;
    flex-direction:column;
    gap:10px;
    font-size:14px;
    color:var(--t-mid);
  }
  .footer-links a,.footer-contact a{transition:color .25s ease;}
  .footer-links a:hover,.footer-contact a:hover{color:var(--cloud-400);}
  .footer-bottom{
    display:flex;
    flex-wrap:wrap;
    align-items:center;
    justify-content:space-between;
    gap:12px;
    padding:22px 0;
    border-top:1px solid var(--line);
    font-size:13px;
    color:var(--t-low);
  }
  .to-top{
    height:34px;
    padding:0 16px;
    border-radius:999px;
    border:1px solid var(--line);
    background:transparent;
    color:var(--t-mid);
    font-size:13px;
    cursor:pointer;
    transition:color .25s ease,border-color .25s ease,background .25s ease;
  }
  .to-top:hover{color:var(--t-hi);border-color:var(--line-strong);background:rgba(255,255,255,.06);}

  /* ---------- 入场动效 ---------- */
  .reveal{opacity:0;transform:translateY(12px);}
  .reveal.is-in{opacity:1;transform:none;transition:opacity .4s ease,transform .4s var(--ease);}
  @media (prefers-reduced-motion: reduce){
    *{animation:none !important;transition:none !important;}
    .reveal{opacity:1;transform:none;}
    html{scroll-behavior:auto;}
  }

/* roulang page: category1 */
:root{
    --ink-900:#070F18;
    --ink-800:#0B1524;
    --ink-700:#101D30;
    --brand-700:#0F3F63;
    --brand-500:#2A7FB8;
    --cloud-400:#35D6C0;
    --cloud-600:#1B9E92;
    --dawn-400:#FFB65C;
    --t-hi:#E9F1F8;
    --t-mid:#9FB3C8;
    --t-low:#6D829A;
    --line:rgba(255,255,255,.08);
    --glass:linear-gradient(180deg,rgba(255,255,255,.07),rgba(255,255,255,.02));
    --radius-card:16px;
    --radius-lg:24px;
    --shadow-card:0 20px 60px rgba(4,10,20,.55);
    --ease:cubic-bezier(.2,.7,.3,1);
  }

  *{box-sizing:border-box}
  html{scroll-behavior:smooth}
  body{
    margin:0;
    background:var(--ink-900);
    color:var(--t-hi);
    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:.01em;
    -webkit-font-smoothing:antialiased;
    overflow-x:hidden;
  }
  img{max-width:100%;height:auto;display:block}
  a{color:inherit}
  button{font-family:inherit}
  h1,h2,h3,h4{margin:0;letter-spacing:.02em;font-weight:700}
  p{margin:0}
  [id]{scroll-margin-top:96px}

  a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{
    outline:2px solid var(--cloud-400);
    outline-offset:2px;
    border-radius:6px;
  }

  /* ---------- 容器 ---------- */
  .container{width:100%;max-width:1200px;margin:0 auto;padding:0 32px}
  @media (min-width:1440px){.container{max-width:1280px}}
  @media (max-width:1024px){.container{padding:0 24px}}
  @media (max-width:640px){.container{padding:0 16px}}

  /* ---------- 按钮 ---------- */
  .btn{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    font-size:15px;font-weight:600;line-height:1;
    padding:14px 26px;border-radius:999px;
    border:1px solid transparent;text-decoration:none;cursor:pointer;
    min-height:44px;
    transition:transform .28s var(--ease),box-shadow .28s var(--ease),
               background .28s var(--ease),color .28s var(--ease),border-color .28s var(--ease),filter .28s var(--ease);
  }
  .btn-primary{
    background:linear-gradient(120deg,var(--cloud-400),var(--brand-500) 68%);
    color:#04121A;
    box-shadow:0 0 0 1px rgba(53,214,192,.45),0 12px 36px rgba(53,214,192,.28);
  }
  .btn-primary:hover{
    filter:brightness(1.06);
    transform:translateY(-1px);
    box-shadow:0 0 0 1px rgba(53,214,192,.62),0 18px 48px rgba(53,214,192,.40);
  }
  .btn-primary:active{transform:translateY(1px)}
  .btn-ghost{
    background:var(--glass);
    border-color:var(--line);
    color:var(--t-hi);
    backdrop-filter:blur(14px) saturate(140%);
    -webkit-backdrop-filter:blur(14px) saturate(140%);
  }
  .btn-ghost:hover{background:rgba(255,255,255,.08);border-color:rgba(53,214,192,.35)}
  .btn-ghost:active{transform:translateY(1px)}

  /* ---------- 徽章 ---------- */
  .badge{
    display:inline-flex;align-items:center;gap:6px;
    padding:5px 11px;border-radius:6px;
    font-size:12px;letter-spacing:.04em;font-weight:600;
    color:var(--cloud-400);
    background:rgba(53,214,192,.08);
    border:1px solid rgba(53,214,192,.22);
    backdrop-filter:blur(10px);
    -webkit-backdrop-filter:blur(10px);
  }

  /* ---------- 页头与导航 ---------- */
  .site-header{
    position:sticky;top:0;z-index:60;
    background:rgba(7,15,24,.55);
    border-bottom:1px solid transparent;
    transition:background .3s var(--ease),border-color .3s var(--ease),backdrop-filter .3s var(--ease);
  }
  .site-header.is-stuck{
    background:rgba(7,15,24,.82);
    backdrop-filter:blur(12px) saturate(140%);
    -webkit-backdrop-filter:blur(12px) saturate(140%);
    border-bottom-color:var(--line);
  }
  .nav-wrap{
    display:grid;
    grid-template-columns:1fr auto 1fr;
    align-items:center;
    gap:24px;
    min-height:78px;
  }
  .nav-left{display:flex;align-items:center;gap:26px;justify-content:flex-start}
  .nav-right{display:flex;align-items:center;gap:22px;justify-content:flex-end}
  .nav-right-links{display:flex;align-items:center;gap:26px}
  .nav-link{
    position:relative;display:inline-block;
    padding:9px 2px;
    font-size:14px;color:var(--t-mid);text-decoration:none;
    white-space:nowrap;
    transition:color .25s var(--ease);
  }
  .nav-link::after{
    content:"";position:absolute;left:0;right:0;bottom:2px;height:2px;border-radius:2px;
    background:var(--cloud-400);
    transform:scaleX(0);transform-origin:center;
    transition:transform .3s var(--ease);
  }
  .nav-link:hover{color:var(--t-hi)}
  .nav-link:hover::after,.nav-link.is-active::after{transform:scaleX(1)}
  .nav-link.is-active{color:var(--t-hi)}

  .logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--t-hi);white-space:nowrap}
  .logo svg{width:30px;height:30px;flex:none}
  .logo-text{display:block;font-size:17px;font-weight:700;letter-spacing:.02em;line-height:1.25}
  .logo-sub{display:block;font-size:10px;letter-spacing:.22em;color:var(--cloud-400);line-height:1.4;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}

  .nav-cta{padding:10px 20px;font-size:14px;min-height:40px}

  .nav-toggle{
    display:none;position:relative;
    width:44px;height:44px;flex:none;
    border-radius:12px;border:1px solid var(--line);
    background:rgba(255,255,255,.03);cursor:pointer;
  }
  .nav-toggle span{
    position:absolute;left:12px;right:12px;height:2px;border-radius:2px;
    background:var(--t-hi);transition:transform .3s var(--ease),opacity .2s var(--ease);
  }
  .nav-toggle span:nth-child(1){top:15px}
  .nav-toggle span:nth-child(2){top:21px}
  .nav-toggle span:nth-child(3){top:27px}
  .nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(6px) rotate(45deg)}
  .nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
  .nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

  .mobile-panel{
    display:none;
    position:absolute;left:0;right:0;top:100%;
    background:rgba(7,15,24,.96);
    backdrop-filter:blur(14px) saturate(140%);
    -webkit-backdrop-filter:blur(14px) saturate(140%);
    border-bottom:1px solid var(--line);
    padding:8px 16px 26px;
  }
  .mobile-panel.is-open{display:block}
  .mobile-panel nav a{
    display:flex;align-items:center;min-height:52px;
    padding:0 10px;font-size:15px;color:var(--t-mid);text-decoration:none;
    border-bottom:1px solid var(--line);
    transition:color .2s var(--ease);
  }
  .mobile-panel nav a:hover,.mobile-panel nav a:active{color:var(--cloud-400)}
  .mobile-panel .btn{width:100%;margin-top:20px}

  /* ---------- Hero ---------- */
  .hero-cat{position:relative;padding:44px 0 84px;overflow:hidden}
  .hero-cat::before{
    content:"";position:absolute;top:-180px;right:-150px;
    width:520px;height:520px;border-radius:50%;
    background:radial-gradient(circle,rgba(53,214,192,.10),rgba(53,214,192,0) 70%);
    pointer-events:none;
  }
  .breadcrumb{
    display:flex;align-items:center;flex-wrap:wrap;gap:8px;
    font-size:14px;color:var(--t-mid);margin-bottom:30px;
  }
  .breadcrumb a{color:var(--t-mid);text-decoration:none;transition:color .25s var(--ease)}
  .breadcrumb a:hover{color:var(--cloud-400)}
  .breadcrumb .sep{color:var(--t-low)}
  .breadcrumb .current{color:var(--t-hi)}

  .hero-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:56px;align-items:center}
  .hero-copy h1{
    font-size:clamp(30px,4.4vw,52px);
    line-height:1.15;
    margin:18px 0 0;
  }
  .hero-lead{
    font-size:17px;line-height:1.8;color:var(--t-mid);
    margin:20px 0 0;max-width:34ch;
  }
  .hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin:32px 0 0}
  .hero-points{
    display:flex;flex-wrap:wrap;gap:34px;
    list-style:none;padding:26px 0 0;margin:38px 0 0;
    border-top:1px solid var(--line);
  }
  .hero-points li strong{
    display:block;font-size:22px;font-weight:700;
    color:var(--dawn-400);letter-spacing:.02em;
    font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  }
  .hero-points li span{display:block;font-size:13px;color:var(--t-low);margin-top:4px}

  .hero-visual{
    position:relative;
    border-radius:var(--radius-lg);
    overflow:hidden;
    border:1px solid var(--line);
    box-shadow:var(--shadow-card);
  }
  .hero-visual img{width:100%;height:380px;object-fit:cover}
  .hero-visual::after{
    content:"";position:absolute;inset:0;pointer-events:none;
    background:linear-gradient(90deg,rgba(7,15,24,.92),rgba(7,15,24,.30) 62%,rgba(7,15,24,.18));
  }

  /* ---------- 交替段落流 ---------- */
  .flow-section{padding:24px 0 96px}
  .flow-row{
    display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center;
    padding:60px 0;
    border-top:1px solid var(--line);
  }
  .flow-row:first-child{border-top:none;padding-top:8px}
  .flow-row.reverse .flow-copy{order:2}
  .flow-row.reverse .flow-media{order:1}

  .flow-index{
    display:inline-block;
    font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
    font-size:13px;letter-spacing:.18em;color:var(--cloud-400);
    margin-bottom:14px;
  }
  .flow-copy h2{
    position:relative;
    padding-left:16px;
    font-size:clamp(22px,2.2vw,28px);
    line-height:1.3;
    margin-bottom:16px;
  }
  .flow-copy h2::before{
    content:"";position:absolute;left:0;top:.16em;bottom:.16em;width:3px;border-radius:3px;
    background:linear-gradient(180deg,var(--cloud-400),var(--brand-500));
  }
  .flow-copy p{color:var(--t-mid);font-size:16px;line-height:1.9;max-width:42ch}
  .flow-list{list-style:none;padding:0;margin:20px 0 0}
  .flow-list li{
    position:relative;padding-left:22px;margin-bottom:10px;
    font-size:15px;line-height:1.8;color:var(--t-mid);
  }
  .flow-list li::before{
    content:"";position:absolute;left:2px;top:.66em;
    width:8px;height:8px;border-radius:2px;
    background:var(--cloud-600);transform:rotate(45deg);
  }

  .flow-media{
    border-radius:var(--radius-lg);
    overflow:hidden;
    border:1px solid var(--line);
    box-shadow:var(--shadow-card);
    transition:transform .32s var(--ease),border-color .32s var(--ease);
  }
  .flow-media img{width:100%;height:330px;object-fit:cover;transition:transform .32s var(--ease)}
  .flow-media:hover{transform:translateY(-4px);border-color:rgba(53,214,192,.35)}
  .flow-media:hover img{transform:scale(1.04)}

  /* ---------- FAQ ---------- */
  .faq-section{padding:0 0 96px}
  .section-head{margin-bottom:36px}
  .section-head h2{
    font-size:clamp(24px,2.8vw,36px);
    line-height:1.25;
    margin-top:16px;
  }
  .section-head p{color:var(--t-mid);margin-top:14px;max-width:46ch}

  .faq-card{
    border:1px solid var(--line);
    border-radius:var(--radius-lg);
    background:var(--glass);
    backdrop-filter:blur(14px) saturate(140%);
    -webkit-backdrop-filter:blur(14px) saturate(140%);
    box-shadow:var(--shadow-card);
    overflow:hidden;
  }
  .faq-card details{border-top:1px solid var(--line)}
  .faq-card details:first-child{border-top:none}
  .faq-card summary{
    list-style:none;cursor:pointer;
    display:flex;align-items:center;gap:16px;
    padding:22px 28px;
    font-size:16px;font-weight:600;color:var(--t-hi);
    transition:background .28s var(--ease);
  }
  .faq-card summary::-webkit-details-marker{display:none}
  .faq-card summary:hover{background:rgba(255,255,255,.04)}
  .faq-idx{
    flex:none;
    font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
    font-size:13px;letter-spacing:.1em;color:var(--cloud-400);
  }
  .faq-q{flex:1;line-height:1.6}
  .faq-icon{position:relative;width:16px;height:16px;flex:none}
  .faq-icon::before,.faq-icon::after{
    content:"";position:absolute;background:var(--cloud-400);border-radius:2px;
    transition:transform .3s var(--ease);
  }
  .faq-icon::before{left:0;top:7px;width:16px;height:2px}
  .faq-icon::after{left:7px;top:0;width:2px;height:16px}
  details[open] .faq-icon::after{transform:scaleY(0)}
  details[open] .faq-icon{transform:rotate(180deg)}
  .faq-a{padding:0 28px 24px 60px;font-size:15px;line-height:1.9;color:var(--t-mid)}
  .faq-a p{max-width:62ch}

  /* ---------- 结尾 CTA ---------- */
  .cta-banner{padding:0 0 104px}
  .cta-card{
    position:relative;
    display:flex;align-items:center;justify-content:space-between;gap:44px;
    padding:48px 52px;
    border-radius:var(--radius-lg);
    border:1px solid var(--line);
    background:
      radial-gradient(circle at 88% 20%, rgba(53,214,192,.14), rgba(53,214,192,0) 62%),
      linear-gradient(140deg, rgba(15,63,99,.55), rgba(16,29,48,.75) 60%, rgba(11,21,36,.9));
    backdrop-filter:blur(14px) saturate(140%);
    -webkit-backdrop-filter:blur(14px) saturate(140%);
    box-shadow:var(--shadow-card);
    overflow:hidden;
  }
  .cta-card::before{
    content:"";position:absolute;inset:0;pointer-events:none;
    background-image:linear-gradient(rgba(255,255,255,.6) 1px,transparent 1px),
                     linear-gradient(90deg,rgba(255,255,255,.6) 1px,transparent 1px);
    background-size:20px 20px;
    opacity:.04;
  }
  .cta-card > *{position:relative;z-index:1}
  .cta-card h2{font-size:clamp(22px,2.4vw,30px);line-height:1.3}
  .cta-card p{color:var(--t-mid);font-size:15px;margin-top:12px;max-width:48ch}

  /* ---------- 页脚 ---------- */
  .site-footer{
    background:var(--ink-800);
    border-top:1px solid var(--line);
    padding:72px 0 0;
  }
  .footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px}
  .footer-brand p{color:var(--t-mid);font-size:14px;line-height:1.85;margin-top:18px;max-width:34ch}
  .footer-title{font-size:14px;font-weight:600;color:var(--cloud-400);letter-spacing:.04em;margin-bottom:16px}
  .footer-links,.footer-contact{list-style:none;padding:0;margin:0}
  .footer-links li,.footer-contact li{margin-bottom:10px;font-size:14px;color:var(--t-mid);line-height:1.7}
  .footer-links a,.footer-contact a{color:var(--t-mid);text-decoration:none;transition:color .25s var(--ease)}
  .footer-links a:hover,.footer-contact a:hover{color:var(--cloud-400)}
  .footer-bottom{
    display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;
    margin-top:56px;padding:22px 0 28px;
    border-top:1px solid var(--line);
    font-size:13px;color:var(--t-low);
  }
  .to-top{
    min-height:38px;padding:8px 18px;
    border-radius:999px;border:1px solid var(--line);
    background:transparent;color:var(--t-mid);
    font-size:13px;cursor:pointer;
    transition:color .25s var(--ease),border-color .25s var(--ease),background .25s var(--ease);
  }
  .to-top:hover{color:var(--cloud-400);border-color:rgba(53,214,192,.5);background:rgba(255,255,255,.04)}

  /* ---------- 进入视口 ---------- */
  .reveal{opacity:0;transform:translateY(12px);transition:opacity .4s ease,transform .4s var(--ease)}
  .reveal.is-visible{opacity:1;transform:none}

  /* ---------- 断点 ---------- */
  @media (max-width:1024px){
    .nav-wrap{display:flex;align-items:center;justify-content:space-between;min-height:66px;gap:12px}
    .nav-left{display:none}
    .nav-right-links{display:none}
    .nav-cta{display:none}
    .nav-toggle{display:block}
    .hero-grid{grid-template-columns:1fr;gap:40px}
    .hero-visual img{height:300px}
    .flow-row{grid-template-columns:1fr;gap:28px;padding:48px 0}
    .flow-row.reverse .flow-copy{order:1}
    .flow-row.reverse .flow-media{order:2}
    .flow-media img{height:280px}
    .flow-copy p{max-width:none}
    .footer-grid{grid-template-columns:1fr 1fr;gap:36px}
    .cta-card{flex-direction:column;align-items:flex-start;gap:28px;padding:40px 32px}
  }
  @media (max-width:640px){
    .hero-cat{padding:28px 0 60px}
    .hero-copy h1{margin-top:14px}
    .hero-points{gap:22px 28px;padding-top:22px;margin-top:30px}
    .hero-points li strong{font-size:19px}
    .hero-visual img{height:220px}
    .flow-section{padding-bottom:64px}
    .flow-row{padding:40px 0}
    .flow-media img{height:220px}
    .faq-card summary{padding:18px 20px;font-size:15px;gap:12px}
    .faq-a{padding:0 20px 20px 48px}
    .cta-banner{padding-bottom:72px}
    .cta-card{padding:32px 22px}
    .footer-grid{grid-template-columns:1fr;gap:32px}
    .footer-bottom{flex-direction:column;align-items:flex-start;gap:12px}
    .section-head h2{margin-top:12px}
  }

  @media (prefers-reduced-motion:reduce){
    html{scroll-behavior:auto}
    .reveal{opacity:1;transform:none;transition:none}
    *,*::before,*::after{
      animation-duration:.01ms !important;
      animation-iteration-count:1 !important;
      transition-duration:.01ms !important;
    }
  }

/* roulang page: category2 */
:root{
    --ink-900:#070F18;
    --ink-800:#0B1524;
    --ink-700:#101D30;
    --brand-700:#0F3F63;
    --brand-500:#2A7FB8;
    --cloud-400:#35D6C0;
    --cloud-600:#1B9E92;
    --dawn-400:#FFB65C;
    --t-hi:#E9F1F8;
    --t-mid:#9FB3C8;
    --t-low:#6D829A;
    --line:rgba(255,255,255,.08);
    --glass:linear-gradient(180deg,rgba(255,255,255,.07),rgba(255,255,255,.02));
    --r-card:16px;
    --r-panel:24px;
    --r-badge:6px;
    --shadow-card:0 20px 60px rgba(4,10,20,.55), inset 0 1px 0 rgba(255,255,255,.06);
  }

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

  html{scroll-behavior:smooth}

  body.page{
    margin:0;
    background:var(--ink-900);
    color:var(--t-hi);
    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;
    overflow-x:hidden;
  }

  img{display:block;max-width:100%;height:auto}
  a{color:inherit;text-decoration:none}
  button{font:inherit;color:inherit;cursor:pointer}
  ul{list-style:none;margin:0;padding:0}

  :focus-visible{outline:2px solid var(--cloud-400);outline-offset:2px;border-radius:4px}

  html body .container{
    width:100%;
    max-width:1200px;
    margin:0 auto;
    padding-left:32px;
    padding-right:32px;
  }
  @media (min-width:1440px){ html body .container{max-width:1280px} }
  @media (max-width:1024px){ html body .container{padding-left:24px;padding-right:24px} }
  @media (max-width:640px){ html body .container{padding-left:16px;padding-right:16px} }

  /* ---------- 导航 ---------- */
  .site-header{
    position:sticky;
    top:0;
    z-index:60;
    background:rgba(7,15,24,.55);
    backdrop-filter:blur(12px) saturate(140%);
    border-bottom:1px solid transparent;
    transition:background .3s ease, border-color .3s ease;
  }
  .site-header.is-scrolled{
    background:rgba(7,15,24,.82);
    border-bottom-color:var(--line);
  }
  .nav-grid{
    display:grid;
    grid-template-columns:1fr auto 1fr;
    align-items:center;
    gap:16px;
    height:76px;
  }
  .nav-left{display:flex;align-items:center;gap:26px;justify-content:flex-start}
  .nav-right{display:flex;align-items:center;gap:18px;justify-content:flex-end}
  .nav-right-links{display:flex;align-items:center;gap:26px}

  .nav-link{
    position:relative;
    font-size:14px;
    color:var(--t-mid);
    padding:6px 0;
    transition:color .25s ease;
    white-space:nowrap;
  }
  .nav-link:hover{color:var(--t-hi)}
  .nav-link.is-active{color:var(--t-hi)}
  .nav-link.is-active::after{
    content:"";
    position:absolute;
    left:0;right:0;bottom:-2px;
    height:2px;
    background:var(--cloud-400);
    border-radius:2px;
  }

  .logo{display:inline-flex;align-items:center;gap:10px;justify-self:center}
  .logo svg{width:36px;height:36px;flex:none}
  .logo-text{display:block;font-size:17px;font-weight:700;letter-spacing:.02em;line-height:1.2}
  .logo-sub{display:block;font-size:10px;letter-spacing:.22em;color:var(--t-low);line-height:1.4}

  .btn{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    gap:8px;
    height:46px;
    padding:0 26px;
    border-radius:999px;
    font-size:15px;
    font-weight:600;
    border:1px solid transparent;
    white-space:nowrap;
    transition:transform .25s cubic-bezier(.2,.7,.3,1), box-shadow .25s ease, background .25s ease, color .25s ease, filter .25s ease;
  }
  .btn-sm{height:38px;padding:0 18px;font-size:14px}
  .btn-primary{
    background:linear-gradient(120deg,var(--cloud-400),var(--brand-500));
    color:#04121A;
    box-shadow:0 0 0 1px rgba(53,214,192,.45), 0 12px 36px rgba(53,214,192,.28);
  }
  .btn-primary:hover{
    filter:brightness(1.06);
    box-shadow:0 0 0 1px rgba(53,214,192,.6), 0 16px 44px rgba(53,214,192,.38);
  }
  .btn-primary:active{transform:translateY(1px)}
  .btn-ghost{
    background:linear-gradient(180deg,rgba(255,255,255,.07),rgba(255,255,255,.02));
    border-color:var(--line);
    color:var(--t-hi);
    backdrop-filter:blur(14px) saturate(140%);
  }
  .btn-ghost:hover{background:rgba(255,255,255,.08)}
  .btn-ghost:active{transform:translateY(1px)}
  .btn-text{
    display:inline-flex;
    align-items:center;
    gap:6px;
    border:0;
    background:none;
    padding:6px 0;
    color:var(--cloud-400);
    font-size:14px;
    font-weight:600;
  }
  .btn-text .arw{transition:transform .25s ease}
  .btn-text:hover .arw{transform:translateX(4px)}

  .nav-toggle{
    display:none;
    align-items:center;
    justify-content:center;
    width:44px;
    height:44px;
    border-radius:12px;
    border:1px solid var(--line);
    background:rgba(255,255,255,.04);
  }
  .nav-toggle span{
    position:relative;
    display:block;
    width:18px;
    height:2px;
    background:var(--t-hi);
    border-radius:2px;
    transition:transform .28s ease, background .28s ease;
  }
  .nav-toggle span::before,
  .nav-toggle span::after{
    content:"";
    position:absolute;
    left:0;
    width:18px;
    height:2px;
    background:var(--t-hi);
    border-radius:2px;
    transition:transform .28s ease, opacity .2s ease;
  }
  .nav-toggle span::before{top:-6px}
  .nav-toggle span::after{top:6px}
  .nav-toggle.is-open span{background:transparent}
  .nav-toggle.is-open span::before{transform:translateY(6px) rotate(45deg)}
  .nav-toggle.is-open span::after{transform:translateY(-6px) rotate(-45deg)}

  .mobile-menu{
    display:none;
    background:rgba(7,15,24,.96);
    backdrop-filter:blur(14px) saturate(140%);
    border-top:1px solid var(--line);
    padding:8px 0 24px;
  }
  .mobile-menu.is-open{display:block}
  .mobile-menu .m-link{
    display:flex;
    align-items:center;
    height:52px;
    font-size:15px;
    color:var(--t-mid);
    border-bottom:1px solid var(--line);
    transition:color .25s ease;
  }
  .mobile-menu .m-link:hover{color:var(--t-hi)}
  .mobile-menu .m-link.is-active{color:var(--cloud-400)}
  .mobile-menu .btn{width:100%;margin-top:18px}

  /* ---------- Hero ---------- */
  .page-hero{
    position:relative;
    overflow:hidden;
    background:var(--ink-800);
    padding:84px 0 92px;
  }
  .page-hero::before{
    content:"";
    position:absolute;
    top:-180px;
    right:-140px;
    width:520px;
    height:520px;
    border-radius:50%;
    background:radial-gradient(circle,rgba(53,214,192,.10),transparent 70%);
    pointer-events:none;
  }
  .hero-bg{position:absolute;inset:0}
  .hero-bg img{width:100%;height:100%;object-fit:cover;opacity:.36}
  .hero-mask{
    position:absolute;
    inset:0;
    background:
      linear-gradient(90deg,rgba(7,15,24,.92),rgba(7,15,24,.42)),
      linear-gradient(180deg,rgba(7,15,24,.55),rgba(11,21,36,.72));
  }
  .hero-fade{
    position:absolute;
    left:0;right:0;bottom:0;
    height:120px;
    background:linear-gradient(180deg,rgba(7,15,24,0),var(--ink-900));
  }
  .hero-inner{position:relative;z-index:2;max-width:800px}

  .breadcrumb{
    display:flex;
    flex-wrap:wrap;
    align-items:center;
    gap:8px;
    font-size:13px;
    color:var(--t-mid);
    margin-bottom:24px;
  }
  .breadcrumb a{transition:color .25s ease}
  .breadcrumb a:hover{color:var(--cloud-400)}
  .breadcrumb .sep{color:var(--t-low)}
  .breadcrumb .cur{color:var(--t-hi)}

  .badge{
    display:inline-flex;
    align-items:center;
    gap:6px;
    padding:6px 12px;
    border-radius:var(--r-badge);
    border:1px solid var(--line);
    background:linear-gradient(180deg,rgba(255,255,255,.07),rgba(255,255,255,.02));
    color:var(--cloud-400);
    font-size:12px;
    letter-spacing:.04em;
    margin-bottom:20px;
  }

  .hero-title{
    font-size:clamp(28px,3.8vw,46px);
    line-height:1.2;
    font-weight:700;
    letter-spacing:.02em;
    margin:0 0 18px;
  }
  .hero-lead{
    font-size:17px;
    line-height:1.85;
    color:var(--t-mid);
    margin:0 0 32px;
    max-width:620px;
  }
  .hero-actions{display:flex;flex-wrap:wrap;gap:14px}

  /* ---------- 板块 ---------- */
  .section{padding:96px 0;position:relative}
  .section-alt{background:var(--ink-800)}
  @media (max-width:1024px){
    .section{padding:72px 0}
    .page-hero{padding:64px 0 76px}
  }
  @media (max-width:640px){
    .section{padding:56px 0}
    .page-hero{padding:48px 0 64px}
  }

  .section-head{max-width:640px;margin-bottom:48px}
  .eyebrow{
    display:inline-flex;
    align-items:center;
    gap:10px;
    font-size:13px;
    letter-spacing:.14em;
    color:var(--cloud-400);
    margin-bottom:14px;
  }
  .eyebrow::before{
    content:"";
    width:22px;
    height:2px;
    background:var(--cloud-400);
    border-radius:2px;
  }
  .sec-title{
    font-size:clamp(24px,2.8vw,36px);
    line-height:1.3;
    font-weight:700;
    letter-spacing:.02em;
    margin:0 0 14px;
  }
  .sec-desc{
    font-size:16px;
    color:var(--t-mid);
    margin:0;
    max-width:640px;
  }

  /* ---------- 指标条 ---------- */
  .metric-strip{
    display:grid;
    grid-template-columns:repeat(4,1fr);
    gap:1px;
    background:var(--line);
    border:1px solid var(--line);
    border-radius:var(--r-card);
    overflow:hidden;
    box-shadow:var(--shadow-card);
  }
  .metric{
    background:var(--ink-800);
    padding:28px 24px;
  }
  .metric-num{
    font-size:clamp(30px,3.4vw,42px);
    font-weight:700;
    color:var(--dawn-400);
    line-height:1.1;
    letter-spacing:0;
  }
  .metric-num small{font-size:16px;font-weight:600;margin-left:4px}
  .metric-label{font-size:13px;color:var(--t-mid);margin-top:10px;line-height:1.6}

  /* ---------- 交替图文卡 ---------- */
  .split-row{
    display:grid;
    gap:26px;
    align-items:stretch;
    margin-bottom:26px;
  }
  .split-5-7{grid-template-columns:5fr 7fr}
  .split-7-5{grid-template-columns:7fr 5fr}

  .card{
    position:relative;
    background:var(--ink-700);
    border:1px solid var(--line);
    border-radius:var(--r-card);
    box-shadow:var(--shadow-card);
    overflow:hidden;
    transition:transform .32s cubic-bezier(.2,.7,.3,1), border-color .32s ease;
  }
  .card:hover{transform:translateY(-4px);border-color:rgba(53,214,192,.35)}
  .card-glass{
    background:var(--glass);
    backdrop-filter:blur(14px) saturate(140%);
    background-color:rgba(16,29,48,.72);
  }
  .card-body{padding:28px}
  @media (max-width:640px){ .card-body{padding:22px} }

  .card-title{
    font-size:21px;
    font-weight:600;
    letter-spacing:.02em;
    margin:0 0 12px;
    line-height:1.45;
  }
  .card-text{
    font-size:15px;
    line-height:1.85;
    color:var(--t-mid);
    margin:0 0 18px;
  }
  .card-list{display:grid;gap:10px;margin:0}
  .card-list li{
    display:flex;
    gap:10px;
    font-size:14px;
    color:var(--t-mid);
    line-height:1.75;
  }
  .card-list li::before{
    content:"";
    flex:none;
    width:6px;
    height:6px;
    margin-top:10px;
    border-radius:50%;
    background:var(--cloud-400);
    opacity:.85;
  }

  .card-media{
    position:relative;
    height:100%;
    min-height:280px;
    overflow:hidden;
    border-radius:var(--r-card);
    border:1px solid var(--line);
    background:var(--ink-700);
  }
  .card-media img{
    width:100%;
    height:100%;
    object-fit:cover;
    transition:transform .32s cubic-bezier(.2,.7,.3,1);
  }
  .card:hover .card-media img{transform:scale(1.04)}
  .media-tag{
    position:absolute;
    left:18px;
    top:18px;
    padding:6px 12px;
    border-radius:var(--r-badge);
    font-size:12px;
    letter-spacing:.04em;
    color:var(--cloud-400);
    background:rgba(7,15,24,.72);
    border:1px solid var(--line);
    backdrop-filter:blur(10px);
  }

  /* ---------- 维度标签 ---------- */
  .dimension-panel{
    display:grid;
    grid-template-columns:4fr 8fr;
    gap:36px;
    align-items:start;
    padding:36px;
    border-radius:var(--r-panel);
    border:1px solid var(--line);
    background:var(--glass);
    background-color:rgba(16,29,48,.6);
    backdrop-filter:blur(14px) saturate(140%);
  }
  .dimension-panel .lead-title{
    font-size:20px;
    font-weight:600;
    margin:0 0 10px;
    padding-left:14px;
    border-left:3px solid var(--cloud-400);
    line-height:1.5;
  }
  .dimension-panel p{font-size:14px;color:var(--t-mid);margin:0}
  .tag-row{display:flex;flex-wrap:wrap;gap:10px}
  .tag{
    font-size:13px;
    color:var(--t-mid);
    padding:9px 16px;
    border-radius:999px;
    border:1px solid var(--line);
    background:rgba(255,255,255,.03);
    transition:color .25s ease,border-color .25s ease;
  }
  .tag:hover{color:var(--t-hi);border-color:rgba(53,214,192,.35)}

  /* ---------- FAQ ---------- */
  .faq{
    border:1px solid var(--line);
    border-radius:var(--r-panel);
    background:var(--glass);
    background-color:rgba(16,29,48,.6);
    backdrop-filter:blur(14px) saturate(140%);
    padding:8px 30px;
    box-shadow:var(--shadow-card);
  }
  .faq-item{border-bottom:1px solid var(--line)}
  .faq-item:last-child{border-bottom:0}
  .faq-q{
    width:100%;
    display:flex;
    align-items:center;
    gap:16px;
    padding:24px 0;
    border:0;
    background:none;
    text-align:left;
    font-size:17px;
    font-weight:600;
    color:var(--t-hi);
    line-height:1.6;
  }
  .faq-num{font-size:13px;color:var(--cloud-400);letter-spacing:.08em;flex:none}
  .faq-icon{
    margin-left:auto;
    flex:none;
    width:18px;
    height:18px;
    color:var(--cloud-400);
    transition:transform .3s ease;
  }
  .faq-item.is-open .faq-icon{transform:rotate(180deg)}
  .faq-a{
    display:none;
    padding:0 0 24px 40px;
    font-size:15px;
    line-height:1.9;
    color:var(--t-mid);
  }
  .faq-item.is-open .faq-a{display:block}

  /* ---------- CTA ---------- */
  .cta-card{
    position:relative;
    overflow:hidden;
    border:1px solid var(--line);
    border-radius:var(--r-panel);
    background:linear-gradient(180deg,rgba(255,255,255,.07),rgba(255,255,255,.02)), var(--ink-800);
    backdrop-filter:blur(14px) saturate(140%);
    padding:56px;
    box-shadow:var(--shadow-card);
  }
  .cta-card::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:20px 20px;
    opacity:.5;
    pointer-events:none;
  }
  .cta-inner{
    position:relative;
    z-index:2;
    display:grid;
    grid-template-columns:7fr 5fr;
    gap:36px;
    align-items:center;
  }
  .cta-title{
    font-size:clamp(22px,2.6vw,32px);
    font-weight:700;
    line-height:1.35;
    letter-spacing:.02em;
    margin:0 0 14px;
  }
  .cta-text{font-size:15px;color:var(--t-mid);margin:0;line-height:1.85}
  .cta-actions{display:flex;flex-wrap:wrap;gap:14px;justify-content:flex-end}

  /* ---------- 页脚 ---------- */
  .site-footer{
    background:var(--ink-800);
    border-top:1px solid var(--line);
    padding:72px 0 0;
  }
  .footer-grid{
    display:grid;
    grid-template-columns:1.5fr 1fr 1fr 1fr;
    gap:40px;
  }
  .footer-brand p{
    color:var(--t-mid);
    font-size:14px;
    line-height:1.85;
    margin:16px 0 0;
    max-width:330px;
  }
  .footer-title{
    font-size:14px;
    font-weight:600;
    color:var(--cloud-400);
    letter-spacing:.04em;
    margin:0 0 16px;
  }
  .footer-links{display:grid;gap:10px}
  .footer-links a{
    font-size:14px;
    color:var(--t-mid);
    transition:color .25s ease;
  }
  .footer-links a:hover{color:var(--t-hi)}
  .footer-contact{display:grid;gap:10px;font-size:14px;color:var(--t-mid)}
  .footer-contact a{transition:color .25s ease}
  .footer-contact a:hover{color:var(--cloud-400)}
  .footer-bottom{
    margin-top:56px;
    padding:22px 0;
    border-top:1px solid var(--line);
    display:flex;
    flex-wrap:wrap;
    gap:12px;
    align-items:center;
    justify-content:space-between;
    font-size:13px;
    color:var(--t-low);
  }
  .to-top{
    border:1px solid var(--line);
    background:rgba(255,255,255,.03);
    border-radius:999px;
    padding:8px 18px;
    font-size:13px;
    color:var(--t-mid);
    transition:color .25s ease, border-color .25s ease, background .25s ease;
  }
  .to-top:hover{color:var(--cloud-400);border-color:rgba(53,214,192,.35);background:rgba(53,214,192,.06)}

  /* ---------- 进入视口 ---------- */
  .reveal{
    opacity:0;
    transform:translateY(12px);
    transition:opacity .4s ease, transform .4s ease;
  }
  .reveal.is-visible{opacity:1;transform:none}

  @media (prefers-reduced-motion: reduce){
    html{scroll-behavior:auto}
    .reveal{opacity:1;transform:none;transition:none}
    *{animation-duration:.001ms !important;transition-duration:.001ms !important}
  }

  /* ---------- 响应式 ---------- */
  @media (max-width:1023px){
    .nav-grid{grid-template-columns:auto 1fr;height:68px}
    .nav-left{display:none}
    .nav-right-links{display:none}
    .nav-right .btn-primary{display:none}
    .logo{justify-self:start;order:1}
    .nav-right{order:2}
    .nav-toggle{display:inline-flex}
    .split-5-7,
    .split-7-5{grid-template-columns:1fr}
    .metric-strip{grid-template-columns:repeat(2,1fr)}
    .dimension-panel{grid-template-columns:1fr;gap:24px;padding:28px}
    .cta-inner{grid-template-columns:1fr;gap:26px}
    .cta-actions{justify-content:flex-start}
    .cta-card{padding:40px 28px}
    .footer-grid{grid-template-columns:1fr 1fr;gap:34px}
    .card-media{min-height:240px}
  }

  @media (max-width:640px){
    .metric-strip{grid-template-columns:1fr}
    .footer-grid{grid-template-columns:1fr}
    .faq{padding:4px 20px}
    .faq-q{font-size:16px;gap:12px}
    .faq-a{padding-left:0}
    .hero-actions .btn{width:100%}
    .cta-actions .btn{width:100%}
    .footer-bottom{flex-direction:column;align-items:flex-start}
  }

/* roulang page: category3 */
:root{
    --ink-900:#070F18;
    --ink-800:#0B1524;
    --ink-700:#101D30;
    --brand-700:#0F3F63;
    --brand-500:#2A7FB8;
    --cloud-400:#35D6C0;
    --cloud-600:#1B9E92;
    --dawn-400:#FFB65C;
    --t-hi:#E9F1F8;
    --t-mid:#9FB3C8;
    --t-low:#6D829A;
    --line:rgba(255,255,255,.08);
    --glass:linear-gradient(180deg, rgba(255,255,255,.07), rgba(255,255,255,.02));
    --r-card:16px;
    --r-big:24px;
    --r-badge:6px;
    --r-pill:999px;
    --shadow-card:0 20px 60px rgba(4,10,20,.55), inset 0 1px 0 rgba(255,255,255,.06);
    --ease:cubic-bezier(.2,.7,.3,1);
    --container:1200px;
  }

  *,*::before,*::after{box-sizing:border-box;}
  html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
  html body{
    margin:0;
    background:var(--ink-900);
    color:var(--t-hi);
    font-family:"PingFang SC","HarmonyOS Sans","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
    font-size:16px;
    line-height:1.85;
    letter-spacing:.01em;
    overflow-x:hidden;
    -webkit-font-smoothing:antialiased;
  }
  img{max-width:100%;display:block;}
  a{color:inherit;text-decoration:none;}
  button{font:inherit;color:inherit;background:none;border:0;}
  h1,h2,h3,h4{margin:0;font-weight:700;letter-spacing:.02em;line-height:1.25;}
  h1{font-size:clamp(30px,3.8vw,46px);line-height:1.15;}
  h2{font-size:clamp(24px,2.8vw,36px);line-height:1.25;}
  h3{font-size:20px;font-weight:600;line-height:1.4;}
  p{margin:0;}
  ul{margin:0;padding:0;list-style:none;}
  ::selection{background:rgba(53,214,192,.28);}
  :focus-visible{outline:2px solid var(--cloud-400);outline-offset:2px;border-radius:6px;}

  .container{width:100%;max-width:var(--container);margin:0 auto;padding:0 32px;}
  @media (max-width:1024px){ .container{padding:0 24px;} }
  @media (max-width:640px){ .container{padding:0 16px;} }
  @media (min-width:1440px){ :root{--container:1280px;} }

  .section{padding:104px 0;position:relative;}
  @media (max-width:1024px){ .section{padding:72px 0;} }
  @media (max-width:640px){ .section{padding:56px 0;} }
  .section-alt{background:var(--ink-800);}

  .section-head{max-width:760px;margin-bottom:48px;}
  .section-lead{margin-top:16px;color:var(--t-mid);font-size:16px;line-height:1.85;max-width:44ch;}
  .eyebrow{display:inline-block;font-size:13px;letter-spacing:.14em;color:var(--cloud-400);margin-bottom:14px;}

  .glass{
    background:var(--glass);
    backdrop-filter:blur(14px) saturate(140%);
    -webkit-backdrop-filter:blur(14px) saturate(140%);
    border:1px solid var(--line);
  }
  @supports not ((backdrop-filter:blur(1px)) or (-webkit-backdrop-filter:blur(1px))){
    .glass{background:var(--ink-700);}
  }

  .grid-tex{
    background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),
                     linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);
    background-size:20px 20px;
  }
  .glow{position:absolute;width:520px;height:520px;border-radius:50%;pointer-events:none;
    background:radial-gradient(circle, rgba(53,214,192,.10), transparent 70%);}
  .glow-hero{top:-140px;right:-120px;}
  .glow-cta{bottom:-180px;left:-160px;}

  /* ---------- header / nav ---------- */
  .site-header{
    position:sticky;top:0;z-index:80;
    background:rgba(7,15,24,.55);
    backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
    border-bottom:1px solid transparent;
    transition:background 320ms var(--ease), border-color 320ms var(--ease);
  }
  .site-header.is-scrolled{
    background:rgba(7,15,24,.86);
    border-bottom-color:var(--line);
  }
  .nav-grid{
    display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:24px;min-height:78px;
  }
  .nav-left,.nav-right{display:flex;align-items:center;gap:6px;}
  .nav-left{justify-content:flex-start;}
  .nav-right{justify-content:flex-end;}
  .nav-link{
    position:relative;display:inline-flex;align-items:center;
    font-size:14.5px;color:var(--t-mid);padding:10px 12px;border-radius:10px;
    transition:color 240ms var(--ease), background 240ms var(--ease);
  }
  .nav-link:hover{color:var(--t-hi);background:rgba(255,255,255,.06);}
  .nav-link.is-active{color:var(--t-hi);}
  .nav-link.is-active::after{
    content:"";position:absolute;left:12px;right:12px;bottom:4px;height:2px;
    background:var(--cloud-400);border-radius:2px;
  }
  .logo{display:inline-flex;align-items:center;gap:10px;justify-self:center;}
  .logo svg{width:34px;height:34px;flex:0 0 auto;}
  .logo-text{display:block;font-size:16px;font-weight:700;color:var(--t-hi);line-height:1.2;letter-spacing:.02em;white-space:nowrap;}
  .logo-sub{display:block;font-size:10px;letter-spacing:.24em;color:var(--cloud-400);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;}
  .nav-toggle{
    display:none;width:44px;height:44px;align-items:center;justify-content:center;
    border:1px solid var(--line);border-radius:12px;cursor:pointer;transition:border-color 240ms var(--ease);
  }
  .nav-toggle:hover{border-color:rgba(53,214,192,.45);}
  .nav-toggle i{display:block;width:18px;height:2px;background:var(--t-hi);border-radius:2px;position:relative;}
  .nav-toggle i::before,.nav-toggle i::after{content:"";position:absolute;left:0;width:18px;height:2px;background:var(--t-hi);border-radius:2px;}
  .nav-toggle i::before{top:-6px;}
  .nav-toggle i::after{top:6px;}
  .mobile-menu{display:none;border-top:1px solid var(--line);background:rgba(7,15,24,.97);backdrop-filter:blur(12px);}
  .mobile-menu.is-open{display:block;}
  .mobile-menu a{display:flex;align-items:center;height:52px;padding:0 16px;font-size:15px;color:var(--t-mid);border-bottom:1px solid var(--line);}
  .mobile-menu a.is-active{color:var(--cloud-400);}
  .mobile-menu .mobile-cta{
    margin:16px;height:48px;justify-content:center;border-bottom:0;border-radius:var(--r-pill);
    background:linear-gradient(120deg,var(--cloud-400),var(--brand-500));color:#04141A;font-weight:600;
  }

  /* ---------- buttons ---------- */
  .btn{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    height:48px;padding:0 26px;border-radius:var(--r-pill);
    font-size:15px;font-weight:600;letter-spacing:.02em;cursor:pointer;
    border:1px solid transparent;transition:all 320ms var(--ease);white-space:nowrap;
  }
  .btn-primary{
    background:linear-gradient(120deg,var(--cloud-400),var(--brand-500));
    color:#04141A;
    box-shadow:0 0 0 1px rgba(53,214,192,.45), 0 12px 36px rgba(53,214,192,.28);
  }
  .btn-primary:hover{filter:brightness(1.06);box-shadow:0 0 0 1px rgba(53,214,192,.6), 0 16px 48px rgba(53,214,192,.42);}
  .btn-primary:active{transform:translateY(1px);}
  .btn-ghost{background:var(--glass);border-color:var(--line);color:var(--t-hi);backdrop-filter:blur(14px);}
  .btn-ghost:hover{background:rgba(255,255,255,.08);border-color:rgba(53,214,192,.35);}
  .btn-ghost:active{transform:translateY(1px);}
  .btn-sm{height:40px;padding:0 18px;font-size:14px;}
  .btn-text{display:inline-flex;align-items:center;gap:6px;color:var(--cloud-400);font-size:15px;font-weight:600;padding:12px 2px;}
  .btn-text .arrow{transition:transform 320ms var(--ease);}
  .btn-text:hover{color:#5FE6D3;}
  .btn-text:hover .arrow{transform:translateX(4px);}

  .badge{
    display:inline-block;padding:5px 12px;border-radius:var(--r-badge);
    font-size:12px;letter-spacing:.04em;color:var(--cloud-400);
    background:rgba(53,214,192,.08);border:1px solid rgba(53,214,192,.22);
  }
  .tag{display:inline-block;padding:4px 10px;border-radius:var(--r-badge);font-size:12px;color:var(--t-mid);border:1px solid var(--line);background:rgba(255,255,255,.03);}

  /* ---------- breadcrumb ---------- */
  .breadcrumb{padding-top:22px;font-size:14px;color:var(--t-low);}
  .breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px;}
  .breadcrumb a{color:var(--t-mid);transition:color 200ms var(--ease);}
  .breadcrumb a:hover{color:var(--cloud-400);}
  .breadcrumb .sep{color:rgba(255,255,255,.2);}
  .breadcrumb .current{color:var(--t-hi);}

  /* ---------- hero ---------- */
  .hero{position:relative;overflow:hidden;padding:56px 0 104px;}
  @media (max-width:1024px){ .hero{padding:40px 0 72px;} }
  @media (max-width:640px){ .hero{padding:32px 0 56px;} }
  .hero-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:56px;align-items:center;}
  .hero-title{margin:18px 0 0;}
  .hero-title .accent{
    color:var(--cloud-400);
    background-image:linear-gradient(transparent 68%, rgba(53,214,192,.22) 68%);
    background-repeat:no-repeat;background-size:100% 100%;
  }
  .hero-lead{margin-top:20px;color:var(--t-mid);font-size:17px;line-height:1.85;max-width:34ch;}
  .hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:32px;}
  .hero-metrics{display:flex;flex-wrap:wrap;gap:32px;margin-top:44px;padding-top:28px;border-top:1px solid var(--line);}
  .metric{display:flex;flex-direction:column;gap:2px;min-width:88px;}
  .metric-num{font-size:28px;font-weight:700;color:var(--dawn-400);letter-spacing:.02em;line-height:1.2;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;}
  .metric-num .unit{font-size:13px;margin-left:3px;font-family:inherit;}
  .metric-label{font-size:13px;color:var(--t-low);}
  .hero-visual{position:relative;}
  .hero-media{position:relative;border-radius:var(--r-big);overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow-card);}
  .hero-media img{width:100%;height:100%;aspect-ratio:4/3;object-fit:cover;}
  .hero-media::after{
    content:"";position:absolute;inset:0;
    background:linear-gradient(90deg, rgba(7,15,24,.92), rgba(7,15,24,.35)),
               linear-gradient(180deg, rgba(7,15,24,0) 50%, rgba(7,15,24,.95) 100%);
  }
  .hero-float{position:absolute;right:-10px;bottom:-22px;min-width:230px;padding:20px;border-radius:var(--r-card);box-shadow:var(--shadow-card);z-index:2;}
  .float-row{display:flex;justify-content:space-between;gap:24px;font-size:13px;color:var(--t-mid);padding:7px 0;}
  .float-row+.float-row{border-top:1px solid var(--line);}
  .float-row strong{color:var(--cloud-400);font-weight:600;}

  /* ---------- layout helpers ---------- */
  .grid-12{display:grid;grid-template-columns:repeat(12,1fr);gap:24px;}
  .col-5{grid-column:span 5;}
  .col-7{grid-column:span 7;}
  .col-4{grid-column:span 4;}
  .col-8{grid-column:span 8;}
  @media (max-width:1024px){
    .grid-12{gap:20px;}
    .col-5,.col-7,.col-4,.col-8{grid-column:span 12;}
  }

  .kx-card{
    border:1px solid var(--line);border-radius:var(--r-big);
    background:var(--glass);backdrop-filter:blur(14px) saturate(140%);
    -webkit-backdrop-filter:blur(14px) saturate(140%);
    box-shadow:var(--shadow-card);
    transition:transform 320ms var(--ease), border-color 320ms var(--ease), box-shadow 320ms var(--ease);
  }
  .kx-card:hover{transform:translateY(-4px);border-color:rgba(53,214,192,.35);}

  .media-card{border:1px solid var(--line);border-radius:var(--r-big);overflow:hidden;background:var(--glass);box-shadow:var(--shadow-card);}
  .media-card img{width:100%;aspect-ratio:4/3;object-fit:cover;transition:transform 320ms var(--ease);}
  .media-card:hover img{transform:scale(1.04);}
  .media-card-body{padding:26px;border-top:1px solid var(--line);}
  .media-card-body h3{margin-bottom:10px;}
  .media-card-body p{color:var(--t-mid);font-size:15px;line-height:1.85;}

  .list-panel{border:1px solid var(--line);border-radius:var(--r-big);background:var(--glass);backdrop-filter:blur(14px);padding:10px 30px;}
  .spec-row{display:grid;grid-template-columns:66px 1fr;gap:20px;padding:26px 0;border-bottom:1px solid var(--line);transition:background 240ms var(--ease);}
  .spec-row:last-child{border-bottom:0;}
  .spec-row:hover{background:rgba(53,214,192,.05);}
  .spec-idx{
    font-size:13px;letter-spacing:.1em;color:var(--cloud-400);line-height:1.4;
    border-left:3px solid var(--cloud-400);padding-left:10px;margin-top:7px;
    font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  }
  .spec-title{font-size:17px;font-weight:600;margin-bottom:6px;}
  .spec-desc{font-size:15px;color:var(--t-mid);line-height:1.85;max-width:42ch;}

  /* ---------- timeline ---------- */
  .timeline{position:relative;}
  .timeline::before{
    content:"";position:absolute;left:5px;top:14px;bottom:14px;width:1px;
    background:linear-gradient(180deg, rgba(53,214,192,.55), rgba(53,214,192,.05));
  }
  .tl-item{position:relative;padding-left:46px;margin-bottom:26px;}
  .tl-item:last-child{margin-bottom:0;}
  .tl-item::before{
    content:"";position:absolute;left:0;top:28px;width:11px;height:11px;border-radius:50%;
    background:var(--ink-900);border:2px solid var(--cloud-400);
    box-shadow:0 0 0 4px rgba(53,214,192,.12);
  }
  .tl-card{border:1px solid var(--line);border-radius:var(--r-card);background:var(--glass);padding:24px 26px;transition:transform 320ms var(--ease), border-color 320ms var(--ease);}
  .tl-card:hover{transform:translateY(-4px);border-color:rgba(53,214,192,.35);}
  .tl-top{display:flex;align-items:center;gap:14px;margin-bottom:10px;flex-wrap:wrap;}
  .tl-step{font-size:13px;letter-spacing:.1em;color:var(--cloud-400);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;}
  .tl-card h3{font-size:18px;}
  .tl-card p{color:var(--t-mid);font-size:15px;line-height:1.85;max-width:46ch;}
  .tl-meta{margin-top:14px;display:flex;flex-wrap:wrap;gap:8px;}

  .sticky-head{position:sticky;top:110px;}
  @media (max-width:1024px){ .sticky-head{position:static;} }

  /* ---------- compare table ---------- */
  .cmp-wrap{border:1px solid var(--line);border-radius:var(--r-big);background:var(--ink-800);overflow-x:auto;box-shadow:var(--shadow-card);}
  table.cmp{width:100%;min-width:680px;border-collapse:collapse;}
  .cmp thead th{
    background:linear-gradient(180deg, rgba(255,255,255,.07), rgba(255,255,255,.02));
    padding:18px 22px;text-align:left;font-size:14px;letter-spacing:.04em;
    color:var(--cloud-400);font-weight:600;border-bottom:1px solid var(--line);white-space:nowrap;
  }
  .cmp td{
    padding:18px 22px;font-size:14.5px;color:var(--t-mid);line-height:1.8;
    border-bottom:1px solid var(--line);vertical-align:top;
  }
  .cmp tbody tr{transition:background 240ms var(--ease);}
  .cmp tbody tr:hover{background:rgba(53,214,192,.06);}
  .cmp tbody tr:last-child td{border-bottom:0;}
  .cmp td:first-child{color:var(--t-hi);font-weight:600;white-space:nowrap;}

  /* ---------- FAQ ---------- */
  .faq-card{border:1px solid var(--line);border-radius:var(--r-big);background:var(--glass);backdrop-filter:blur(14px);padding:8px 30px;box-shadow:var(--shadow-card);}
  .faq-item{border-bottom:1px solid var(--line);}
  .faq-item:last-child{border-bottom:0;}
  .faq-q{
    width:100%;display:flex;align-items:center;gap:16px;padding:22px 0;
    text-align:left;cursor:pointer;font-size:16.5px;font-weight:600;color:var(--t-hi);
    line-height:1.6;
  }
  .faq-q:hover{color:var(--cloud-400);}
  .faq-index{font-size:13px;letter-spacing:.08em;color:var(--cloud-400);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;flex:0 0 auto;}
  .faq-icon{position:relative;margin-left:auto;width:14px;height:14px;flex:0 0 auto;transition:transform 320ms var(--ease);}
  .faq-icon::before,.faq-icon::after{content:"";position:absolute;background:var(--cloud-400);border-radius:2px;transition:opacity 320ms var(--ease);}
  .faq-icon::before{left:0;top:6px;width:14px;height:2px;}
  .faq-icon::after{left:6px;top:0;width:2px;height:14px;}
  .faq-item.is-open .faq-icon{transform:rotate(180deg);}
  .faq-item.is-open .faq-icon::after{opacity:0;}
  .faq-a{max-height:0;overflow:hidden;transition:max-height 360ms var(--ease);}
  .faq-a p{padding:0 4px 24px 34px;color:var(--t-mid);font-size:15.5px;line-height:1.9;max-width:52ch;}

  /* ---------- CTA ---------- */
  .cta-card{position:relative;overflow:hidden;border:1px solid var(--line);border-radius:var(--r-big);padding:56px;background:var(--glass);backdrop-filter:blur(16px) saturate(140%);box-shadow:var(--shadow-card);}
  .cta-grid{position:relative;z-index:2;display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:40px;align-items:center;}
  .cta-grid p{margin-top:16px;color:var(--t-mid);font-size:16px;max-width:40ch;}
  .cta-actions{display:flex;flex-wrap:wrap;gap:16px;justify-content:flex-end;}
  @media (max-width:900px){
    .cta-card{padding:36px 24px;}
    .cta-grid{grid-template-columns:1fr;gap:24px;}
    .cta-actions{justify-content:flex-start;}
  }

  /* ---------- footer ---------- */
  .site-footer{background:var(--ink-800);border-top:1px solid var(--line);padding:72px 0 28px;}
  .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1.2fr 1.1fr;gap:40px;}
  @media (max-width:1024px){ .footer-grid{grid-template-columns:1fr 1fr;gap:32px;} }
  @media (max-width:640px){ .footer-grid{grid-template-columns:1fr;} }
  .footer-brand p{margin-top:16px;font-size:14px;color:var(--t-mid);line-height:1.85;max-width:34ch;}
  .footer-title{font-size:14px;color:var(--cloud-400);font-weight:600;letter-spacing:.04em;margin-bottom:16px;}
  .footer-links li+li{margin-top:10px;}
  .footer-links a{font-size:14px;color:var(--t-mid);transition:color 200ms var(--ease);}
  .footer-links a:hover{color:var(--cloud-400);}
  .footer-contact li{font-size:14px;color:var(--t-mid);line-height:1.8;}
  .footer-contact li+li{margin-top:8px;}
  .footer-contact a{color:var(--cloud-400);}
  .footer-bottom{
    display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;align-items:center;
    margin-top:48px;padding-top:22px;border-top:1px solid var(--line);
    font-size:13px;color:var(--t-low);
  }
  .to-top{
    border:1px solid var(--line);border-radius:var(--r-pill);padding:9px 18px;
    font-size:13px;color:var(--t-mid);cursor:pointer;transition:all 240ms var(--ease);
  }
  .to-top:hover{border-color:rgba(53,214,192,.45);color:var(--cloud-400);}

  /* ---------- reveal ---------- */
  .reveal{opacity:0;transform:translateY(12px);transition:opacity 400ms var(--ease), transform 400ms var(--ease);}
  .reveal.is-visible{opacity:1;transform:none;}

  @media (prefers-reduced-motion: reduce){
    *{animation:none !important;transition:none !important;}
    .reveal{opacity:1;transform:none;}
    html{scroll-behavior:auto;}
  }

  /* ---------- responsive ---------- */
  @media (max-width:1023px){
    .nav-grid{grid-template-columns:1fr auto;min-height:66px;}
    .logo{justify-self:start;}
    .nav-left,.nav-right .nav-link,.nav-right .btn{display:none;}
    .nav-toggle{display:inline-flex;}
    .hero-grid{grid-template-columns:1fr;gap:40px;}
    .hero-lead{max-width:46ch;}
    .hero-float{position:static;margin-top:18px;display:flex;gap:28px;min-width:0;justify-content:flex-start;}
    .hero-float .float-row{flex-direction:column;gap:2px;border-top:0;padding:0;}
  }
  @media (max-width:640px){
    .list-panel{padding:4px 20px;}
    .spec-row{grid-template-columns:1fr;gap:8px;}
    .spec-idx{border-left:3px solid var(--cloud-400);margin-top:0;}
    .faq-card{padding:4px 20px;}
    .faq-q{font-size:15.5px;gap:12px;}
    .faq-a p{padding-left:0;}
    .hero-metrics{gap:20px;}
    .metric{min-width:72px;}
    .footer-bottom{flex-direction:column;align-items:flex-start;}
  }