/* roulang page: index */
:root{
  --bg:#080e1c;
  --bg-soft:#0b1424;
  --panel:#111c33;
  --panel-2:#16223c;
  --line:rgba(255,255,255,.08);
  --line-strong:rgba(255,255,255,.16);
  --text:#e9eefb;
  --muted:#96a5c3;
  --brand:#12c2a3;
  --brand-soft:#3ad7b8;
  --brand-deep:#0b8f79;
  --accent:#f3b64a;
  --radius-lg:20px;
  --radius:14px;
  --radius-sm:10px;
  --shadow:0 20px 44px rgba(2,7,18,.45);
  --container:1180px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,"Segoe UI",Arial,sans-serif;
  font-size:16px;
  line-height:1.78;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block;border:0}
a{color:var(--brand-soft);text-decoration:none;transition:color .18s ease}
a:hover{color:var(--accent)}
h1,h2,h3,h4{margin:0;color:#fff;line-height:1.36;font-weight:700;letter-spacing:-.01em}
p{margin:0 0 12px}
ul,ol{margin:0;padding:0;list-style:none}
button{font-family:inherit}
:focus-visible{outline:2px solid var(--brand);outline-offset:3px}

.site-container{width:100%;max-width:var(--container);margin:0 auto;padding:0 22px}

/* header */
.topbar{background:#060b16;border-bottom:1px solid var(--line);font-size:13px;color:var(--muted)}
.topbar-inner{max-width:var(--container);margin:0 auto;padding:8px 22px;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.topbar-left{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.topbar-dot{width:7px;height:7px;border-radius:50%;background:var(--brand);display:inline-block}
.topbar-links{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.topbar-links a{color:#b9c6de;font-size:13px}
.topbar-links a:hover{color:var(--brand-soft)}

.site-header{position:sticky;top:0;z-index:60;background:rgba(8,14,28,.94);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}
.nav-inner{max-width:var(--container);margin:0 auto;padding:12px 22px;display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:11px;color:#fff}
.brand:hover{color:#fff}
.brand-mark{width:38px;height:38px;border-radius:11px;display:grid;place-items:center;font-weight:800;font-size:15px;color:#04140f;background:linear-gradient(135deg,var(--brand),var(--brand-deep));box-shadow:0 8px 20px rgba(18,194,163,.3);letter-spacing:0}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-name{font-size:17px;font-weight:700;letter-spacing:.02em}
.brand-sub{font-size:11.5px;color:var(--muted);letter-spacing:.12em}
.nav-links{display:flex;align-items:center;flex-wrap:wrap;gap:4px}
.nav-link{display:inline-flex;align-items:center;padding:9px 14px;border-radius:10px;color:#c6d2e8;font-size:14.5px;font-weight:500;white-space:nowrap;transition:background .18s ease,color .18s ease}
.nav-link:hover{background:rgba(255,255,255,.07);color:#fff}
.nav-link.active{background:rgba(18,194,163,.14);color:#6fe3cb}
.nav-cta{margin-left:6px}
.nav-cta .btn{padding:9px 18px;font-size:14px}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;border-radius:999px;font-size:15px;font-weight:600;border:1px solid transparent;cursor:pointer;transition:transform .18s ease,box-shadow .18s ease,background .18s ease,border-color .18s ease}
.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand-deep));color:#04140f;box-shadow:0 12px 28px rgba(18,194,163,.28)}
.btn-primary:hover{color:#04140f;transform:translateY(-2px);box-shadow:0 18px 36px rgba(18,194,163,.36)}
.btn-ghost{border-color:var(--line-strong);background:rgba(255,255,255,.04);color:var(--text)}
.btn-ghost:hover{color:#fff;background:rgba(255,255,255,.1);transform:translateY(-2px)}
.btn-block{width:100%}

/* hero */
.hero{position:relative;overflow:hidden;padding:56px 0 64px;background:radial-gradient(1100px 500px at 12% -12%,rgba(18,194,163,.24),transparent 62%),radial-gradient(900px 460px at 92% -4%,rgba(66,110,232,.24),transparent 58%),linear-gradient(180deg,#0a1122 0%,#0a1020 100%)}
.hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);background-size:64px 64px;-webkit-mask-image:radial-gradient(circle at 50% 0,#000,transparent 72%);mask-image:radial-gradient(circle at 50% 0,#000,transparent 72%);pointer-events:none}
.hero-inner{position:relative;z-index:1}
.hero-series{display:flex;flex-wrap:wrap;gap:8px;padding:10px;border:1px solid var(--line-strong);border-radius:16px;background:rgba(6,11,22,.6);backdrop-filter:blur(8px);margin-bottom:38px}
.series-item{padding:8px 15px;border-radius:10px;font-size:13.5px;color:#c8d4ea;background:rgba(255,255,255,.04);border:1px solid transparent;transition:color .18s ease,border-color .18s ease,background .18s ease}
.series-item:hover{color:#fff;border-color:rgba(18,194,163,.42);background:rgba(18,194,163,.1)}
.series-item.is-on{background:rgba(18,194,163,.16);color:#7deed8;border-color:rgba(18,194,163,.42)}
.hero-badge{display:inline-flex;align-items:center;gap:8px;padding:6px 14px;border-radius:999px;font-size:12.5px;letter-spacing:.06em;color:#7deed8;background:rgba(18,194,163,.12);border:1px solid rgba(18,194,163,.3);margin-bottom:20px}
.hero h1{font-size:40px;line-height:1.26;max-width:920px;margin-bottom:20px}
.hero h1 em{font-style:normal;color:var(--brand-soft)}
.hero-lead{max-width:860px;color:#c0cde5;font-size:16.5px;line-height:1.85;margin-bottom:28px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:34px}
.hero-points{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
.hero-point{min-width:0;padding:16px 18px;border-radius:var(--radius);border:1px solid var(--line);background:linear-gradient(180deg,rgba(22,34,60,.86),rgba(12,21,38,.86));box-shadow:var(--shadow)}
.hero-point strong{display:block;font-size:14.5px;color:#fff;margin-bottom:4px}
.hero-point span{display:block;font-size:13px;color:var(--muted);line-height:1.65}

/* section */
.section{padding:72px 0;border-top:1px solid var(--line)}
.section--alt{background:linear-gradient(180deg,#0b1424 0%,#0a1120 100%)}
.section-head{max-width:800px;margin-bottom:36px}
.section-eyebrow{display:inline-block;font-size:12.5px;letter-spacing:.16em;color:var(--brand-soft);margin-bottom:10px}
.section-head h2{font-size:30px;margin-bottom:14px}
.section-head p{color:var(--muted);font-size:15.5px;margin:0}

/* grids & cards */
.grid-cards{display:grid;gap:18px}
.grid-cards > *{min-width:0}
.cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.cols-4{grid-template-columns:repeat(4,minmax(0,1fr))}

.site-card{min-width:0;padding:24px;border-radius:var(--radius);border:1px solid var(--line);background:linear-gradient(180deg,var(--panel),var(--panel-2));box-shadow:var(--shadow);transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease}
.site-card:hover{transform:translateY(-3px);border-color:rgba(18,194,163,.42);box-shadow:0 26px 52px rgba(2,7,18,.55)}
.site-card h3{font-size:17px;margin-bottom:9px}
.site-card p{color:var(--muted);font-size:14.5px;margin:0;line-height:1.75}
.card-index{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:9px;font-size:13px;font-weight:700;color:#04140f;background:linear-gradient(135deg,var(--brand),var(--brand-deep));margin-bottom:14px}

.tag{display:inline-flex;align-items:center;padding:3px 10px;border-radius:999px;font-size:12px;color:#6fe3cb;background:rgba(18,194,163,.12);border:1px solid rgba(18,194,163,.28)}

/* download */
.dl-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.dl-grid > *{min-width:0}
.dl-card{display:flex;flex-direction:column;gap:14px;min-width:0;padding:26px 24px;border-radius:var(--radius-lg);border:1px solid var(--line);background:linear-gradient(180deg,var(--panel),var(--panel-2));box-shadow:var(--shadow);transition:transform .2s ease,border-color .2s ease}
.dl-card:hover{transform:translateY(-4px);border-color:rgba(18,194,163,.45)}
.dl-icon{width:54px;height:54px;border-radius:15px;display:grid;place-items:center;font-size:14px;font-weight:800;letter-spacing:.04em;color:#04140f;background:linear-gradient(135deg,var(--brand),var(--brand-deep));box-shadow:0 10px 24px rgba(18,194,163,.28)}
.dl-card h3{font-size:18px;margin:0}
.dl-card p{color:var(--muted);font-size:14px;margin:0;flex:1 1 auto}
.file-note{font-size:12.5px;color:#7f8fab;letter-spacing:.04em}
.dl-tip{margin-top:20px;padding:14px 18px;border-radius:var(--radius);border:1px dashed rgba(255,255,255,.16);background:rgba(255,255,255,.03);font-size:13.5px;color:var(--muted)}

/* capability strip */
.cap-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
.cap-grid > *{min-width:0}
.cap-item{min-width:0;padding:20px;border-radius:var(--radius);border:1px solid var(--line);background:rgba(255,255,255,.035)}
.cap-item strong{display:block;font-size:15px;color:#fff;margin-bottom:6px}
.cap-item span{display:block;font-size:13.5px;color:var(--muted);line-height:1.7}

/* compare */
.compare-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.compare-grid > *{min-width:0}
.compare-card{min-width:0;padding:26px;border-radius:var(--radius-lg);border:1px solid var(--line);background:linear-gradient(180deg,var(--panel),var(--panel-2))}
.compare-card.is-brand{border-color:rgba(18,194,163,.4);background:linear-gradient(180deg,rgba(20,44,50,.9),rgba(14,26,38,.92))}
.compare-card h3{font-size:17px;margin-bottom:16px}
.compare-list{display:grid;gap:12px}
.compare-list li{display:flex;gap:10px;font-size:14.5px;color:#c2cfe6;line-height:1.7}
.compare-list li::before{content:"";flex:0 0 7px;height:7px;margin-top:9px;border-radius:50%;background:var(--brand)}
.compare-card.plain .compare-list li::before{background:#5c6b87}

/* steps */
.steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.steps > *{min-width:0}
.step{min-width:0;padding:24px;border-radius:var(--radius);border:1px solid var(--line);background:rgba(255,255,255,.035);position:relative}
.step-num{font-size:12.5px;letter-spacing:.16em;color:var(--brand-soft);margin-bottom:10px;display:block}
.step h3{font-size:16.5px;margin-bottom:8px}
.step p{color:var(--muted);font-size:14px;margin:0}

/* myths */
.myth-list{display:grid;gap:14px}
.myth-item{display:grid;grid-template-columns:44px minmax(0,1fr);gap:16px;align-items:start;padding:20px 22px;border-radius:var(--radius);border:1px solid var(--line);background:rgba(255,255,255,.035)}
.myth-num{display:grid;place-items:center;width:44px;height:44px;border-radius:12px;font-weight:700;font-size:15px;color:var(--accent);background:rgba(243,182,74,.12);border:1px solid rgba(243,182,74,.3)}
.myth-item h3{font-size:16px;margin-bottom:6px}
.myth-item p{color:var(--muted);font-size:14px;margin:0}

/* risk */
.risk-box{padding:28px;border-radius:var(--radius-lg);border:1px solid rgba(243,182,74,.32);background:linear-gradient(180deg,rgba(48,36,15,.55),rgba(24,20,12,.55))}
.risk-box h3{font-size:18px;margin-bottom:14px;color:#ffd489}
.risk-list{display:grid;gap:11px}
.risk-list li{display:flex;gap:10px;font-size:14.5px;color:#ddd2bb;line-height:1.75}
.risk-list li::before{content:"";flex:0 0 6px;height:6px;margin-top:10px;border-radius:50%;background:var(--accent)}

/* news */
.news-grid{display:grid;grid-template-columns:1.9fr 1fr;gap:22px}
.news-grid > *{min-width:0}
.news-list{display:grid;gap:12px}
.news-item a{display:block;padding:18px 20px;border-radius:var(--radius);border:1px solid var(--line);background:rgba(255,255,255,.035);transition:border-color .18s ease,background .18s ease,transform .18s ease}
.news-item a:hover{border-color:rgba(18,194,163,.42);background:rgba(18,194,163,.07);transform:translateX(3px)}
.news-meta{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:8px}
.news-time{font-size:12.5px;color:#7f8fab}
.news-item h3{font-size:16px;margin-bottom:6px;color:#fff}
.news-item p{color:var(--muted);font-size:14px;margin:0}
.news-rail{min-width:0;padding:22px;border-radius:var(--radius);border:1px solid var(--line);background:linear-gradient(180deg,var(--panel),var(--panel-2))}
.rail-title{font-size:15px;margin-bottom:14px;color:#fff}
.rail{display:grid;gap:10px}
.rail-item{display:block;padding:11px 14px;border-radius:var(--radius-sm);font-size:14px;color:#c6d2e8;background:rgba(255,255,255,.04);border:1px solid transparent;transition:border-color .18s ease,color .18s ease}
.rail-item:hover{color:#fff;border-color:rgba(18,194,163,.4)}
.empty-note{color:var(--muted);font-size:14.5px;margin:0}

/* faq */
.faq{display:grid;gap:12px;max-width:920px}
.faq details{padding:16px 20px;border-radius:var(--radius);border:1px solid var(--line);background:rgba(255,255,255,.035)}
.faq summary{list-style:none;cursor:pointer;display:flex;align-items:flex-start;justify-content:space-between;gap:16px;font-weight:600;color:#fff;font-size:15.5px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";flex:0 0 auto;color:var(--brand-soft);font-weight:700}
.faq details[open] summary::after{content:"−"}
.faq p{margin:12px 0 0;color:var(--muted);font-size:14.5px}

/* final cta */
.final-cta{padding:44px;border-radius:var(--radius-lg);border:1px solid rgba(18,194,163,.34);background:radial-gradient(700px 260px at 10% 0,rgba(18,194,163,.2),transparent 65%),linear-gradient(180deg,#101d31,#0d1727);display:flex;align-items:center;justify-content:space-between;gap:26px;flex-wrap:wrap}
.final-cta h2{font-size:26px;margin-bottom:10px}
.final-cta p{color:var(--muted);font-size:15px;margin:0;max-width:660px}

/* footer */
.site-footer{background:#060b16;border-top:1px solid var(--line);padding:54px 0 26px}
.footer-grid{display:grid;grid-template-columns:1.7fr 1fr 1fr 1.15fr;gap:26px}
.footer-grid > *{min-width:0}
.footer-brand{display:flex;align-items:center;gap:11px;margin-bottom:14px}
.footer-desc{color:var(--muted);font-size:14px;line-height:1.8;margin:0;max-width:380px}
.footer-title{font-size:14px;color:#fff;margin-bottom:14px;letter-spacing:.04em}
.footer-links{display:grid;gap:9px}
.footer-links a{color:#a9b8d2;font-size:14px}
.footer-links a:hover{color:var(--brand-soft)}
.footer-bottom{margin-top:36px;padding-top:18px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;color:#7f8fab;font-size:13px}

/* responsive */
@media (max-width:1024px){
  .hero h1{font-size:33px}
  .cols-3,.cols-4,.cap-grid,.dl-grid,.steps{grid-template-columns:repeat(2,minmax(0,1fr))}
  .hero-points{grid-template-columns:repeat(2,minmax(0,1fr))}
  .news-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .section-head h2{font-size:26px}
  .final-cta h2{font-size:23px}
}
@media (max-width:768px){
  .nav-inner{padding:10px 18px;gap:12px}
  .nav-links{flex-wrap:nowrap;overflow-x:auto;width:100%;padding-bottom:4px;scrollbar-width:none}
  .nav-links::-webkit-scrollbar{height:0}
  .nav-cta{margin-left:0}
  .hero{padding:40px 0 48px}
  .hero h1{font-size:27px}
  .hero-lead{font-size:15.5px}
  .hero-series{margin-bottom:26px}
  .cols-2,.cols-3,.cols-4,.cap-grid,.dl-grid,.steps,.compare-grid,.hero-points{grid-template-columns:1fr}
  .section{padding:54px 0}
  .section-head h2{font-size:23px}
  .myth-item{grid-template-columns:1fr;gap:12px}
  .final-cta{padding:28px 22px}
  .footer-grid{grid-template-columns:1fr}
}
@media (max-width:520px){
  .site-container{padding:0 16px}
  .topbar-inner{padding:8px 16px}
  .hero h1{font-size:23px}
  .brand-name{font-size:15.5px}
  .site-card,.dl-card,.compare-card,.news-rail{padding:20px}
  .btn{width:100%}
  .hero-actions .btn{width:100%}
}

/* roulang page: article */
:root{
  --bg:#080e1c;
  --bg-soft:#0b1424;
  --panel:#111c33;
  --panel-2:#16223c;
  --line:rgba(255,255,255,.08);
  --line-strong:rgba(255,255,255,.16);
  --text:#e9eefb;
  --muted:#96a5c3;
  --brand:#12c2a3;
  --brand-soft:#3ad7b8;
  --brand-deep:#0b8f79;
  --accent:#f3b64a;
  --radius-lg:20px;
  --radius:14px;
  --radius-sm:10px;
  --shadow:0 20px 44px rgba(2,7,18,.45);
  --container:1180px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,"Segoe UI",Arial,sans-serif;
  font-size:16px;
  line-height:1.78;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block;border:0}
a{color:var(--brand-soft);text-decoration:none;transition:color .18s ease}
a:hover{color:var(--accent)}
a:focus-visible,.btn:focus-visible,.nav-link:focus-visible,.side-link:focus-visible,.dl-item:focus-visible{outline:2px solid var(--brand-soft);outline-offset:3px;border-radius:8px}
button{font-family:inherit}
h1,h2,h3,h4{margin:0 0 .55em;line-height:1.4;color:#fff;font-weight:700}
p{margin:0 0 1em}
ul,ol{margin:0 0 1em;padding-left:1.35em}
.site-container{width:100%;max-width:var(--container);margin:0 auto;padding:0 22px}
/* topbar */
.topbar{background:#060b16;border-bottom:1px solid var(--line);font-size:13px;color:var(--muted)}
.topbar-inner{max-width:var(--container);margin:0 auto;padding:8px 22px;display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap}
.topbar-left{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.topbar-dot{width:7px;height:7px;border-radius:50%;background:var(--brand);display:inline-block}
.topbar-links{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.topbar-links a{color:#b9c6de;font-size:13px}
.topbar-links a:hover{color:var(--brand-soft)}
/* header */
.site-header{position:sticky;top:0;z-index:60;background:rgba(8,14,28,.94);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}
.nav-inner{max-width:var(--container);margin:0 auto;padding:12px 22px;display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:11px;color:#fff}
.brand:hover{color:#fff}
.brand-mark{width:38px;height:38px;border-radius:11px;display:grid;place-items:center;font-weight:800;font-size:15px;color:#04140f;background:linear-gradient(135deg,var(--brand),var(--brand-deep));box-shadow:0 8px 20px rgba(18,194,163,.3);letter-spacing:0;flex:0 0 auto}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-name{font-size:17px;font-weight:700;letter-spacing:.02em}
.brand-sub{font-size:11.5px;color:var(--muted);letter-spacing:.12em}
.nav-links{display:flex;align-items:center;flex-wrap:wrap;gap:4px}
.nav-link{display:inline-flex;align-items:center;padding:9px 14px;border-radius:10px;color:#c6d2e8;font-size:14.5px;font-weight:500;white-space:nowrap;transition:background .18s ease,color .18s ease}
.nav-link:hover{background:rgba(255,255,255,.07);color:#fff}
.nav-link.active{background:rgba(18,194,163,.14);color:#6fe3cb}
.nav-cta{margin-left:6px}
.nav-cta .btn{padding:9px 18px;font-size:14px}
/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;border-radius:999px;font-size:15px;font-weight:600;border:1px solid transparent;cursor:pointer;transition:transform .18s ease,box-shadow .18s ease,background .18s ease,border-color .18s ease,color .18s ease}
.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand-deep));color:#04140f;box-shadow:0 12px 28px rgba(18,194,163,.28)}
.btn-primary:hover{color:#04140f;transform:translateY(-2px);box-shadow:0 18px 36px rgba(18,194,163,.36)}
.btn-ghost{border-color:var(--line-strong);background:rgba(255,255,255,.04);color:var(--text)}
.btn-ghost:hover{color:#fff;background:rgba(255,255,255,.1);transform:translateY(-2px)}
.btn-block{width:100%}
/* article hero */
.article-hero{position:relative;overflow:hidden;padding:42px 0 44px;border-bottom:1px solid var(--line);background:radial-gradient(900px 400px at 6% -22%,rgba(18,194,163,.22),transparent 62%),radial-gradient(780px 380px at 96% -12%,rgba(66,110,232,.2),transparent 58%),linear-gradient(180deg,#0a1122 0%,#0a1020 100%)}
.article-hero::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:64px 64px;-webkit-mask-image:radial-gradient(circle at 40% 0,#000,transparent 74%);mask-image:radial-gradient(circle at 40% 0,#000,transparent 74%);pointer-events:none}
.article-hero-inner{position:relative;z-index:1}
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13.5px;color:var(--muted);margin-bottom:18px}
.crumbs a{color:#b9c6de}
.crumbs a:hover{color:var(--brand-soft)}
.crumbs .sep{color:#4a5b7a}
.article-tag{display:inline-flex;align-items:center;gap:6px;padding:5px 13px;border-radius:999px;font-size:12.5px;letter-spacing:.05em;color:#7deed8;background:rgba(18,194,163,.12);border:1px solid rgba(18,194,163,.3);margin-bottom:16px}
.article-hero h1{font-size:34px;line-height:1.32;max-width:940px;margin-bottom:16px}
.article-lead{max-width:840px;color:#c0cde5;font-size:16px;line-height:1.85;margin-bottom:20px}
.article-meta{display:flex;flex-wrap:wrap;align-items:center;gap:10px 20px;font-size:13.5px;color:var(--muted)}
.article-meta .meta-item{display:inline-flex;align-items:center;gap:7px}
.article-meta .meta-dot{width:6px;height:6px;border-radius:50%;background:var(--brand);display:inline-block}
/* layout */
.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:30px;align-items:start;padding:48px 0 68px}
.article-main{min-width:0}
.article-main > * + *{margin-top:26px}
.article-side{min-width:0;display:grid;gap:18px;position:sticky;top:88px}
/* article body */
.article-body{max-width:760px;background:linear-gradient(180deg,rgba(22,34,60,.74),rgba(12,21,38,.74));border:1px solid var(--line);border-radius:var(--radius-lg);padding:30px 30px 16px;box-shadow:var(--shadow);overflow-wrap:break-word}
.article-body p{color:#cdd8ec;margin-bottom:1.1em}
.article-body h2{font-size:22px;margin:1.6em 0 .65em;padding-left:12px;border-left:3px solid var(--brand)}
.article-body h3{font-size:18px;margin:1.35em 0 .55em;color:#dfe8f8}
.article-body h4{font-size:16px;margin:1.2em 0 .5em;color:#dfe8f8}
.article-body ul,.article-body ol{color:#cdd8ec}
.article-body li{margin-bottom:.42em}
.article-body a{border-bottom:1px solid rgba(58,215,184,.42)}
.article-body blockquote{margin:1.2em 0;padding:14px 18px;border-left:3px solid var(--accent);background:rgba(243,182,74,.08);border-radius:0 var(--radius-sm) var(--radius-sm) 0;color:#e4d9bd}
.article-body blockquote p:last-child{margin-bottom:0}
.article-body img{border-radius:var(--radius);margin:1em 0}
.article-body table{width:100%;border-collapse:collapse;margin:1.1em 0;font-size:14.5px}
.article-body th,.article-body td{border:1px solid var(--line-strong);padding:9px 12px;text-align:left;vertical-align:top}
.article-body th{background:rgba(255,255,255,.05);color:#fff;font-weight:600}
.article-body code{background:rgba(255,255,255,.09);padding:2px 6px;border-radius:6px;font-size:.92em;color:#a8f0e2}
.article-body hr{border:0;border-top:1px solid var(--line);margin:1.8em 0}
.article-empty{padding:8px 0 20px}
.article-empty h2{font-size:21px;margin-bottom:10px;padding-left:0;border-left:0}
.article-empty p{color:var(--muted)}
/* panels */
.panel{background:linear-gradient(180deg,rgba(22,34,60,.7),rgba(12,21,38,.7));border:1px solid var(--line);border-radius:var(--radius-lg);padding:28px;box-shadow:var(--shadow)}
.panel h2{font-size:22px;margin-bottom:10px}
.panel-sub{color:var(--muted);font-size:14.5px;margin-bottom:20px}
.grid-cards{display:grid;gap:16px}
.grid-cards > *{min-width:0}
.cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.feature-card{min-width:0;padding:18px 18px 16px;border-radius:var(--radius);background:rgba(255,255,255,.04);border:1px solid var(--line);transition:border-color .18s ease,transform .18s ease,background .18s ease}
.feature-card:hover{border-color:rgba(18,194,163,.42);background:rgba(18,194,163,.07);transform:translateY(-3px)}
.feature-card h3{font-size:16px;margin-bottom:8px;color:#fff}
.feature-card p{margin:0;color:var(--muted);font-size:14.5px;line-height:1.75}
/* download */
.download-panel{background:radial-gradient(700px 300px at 4% -30%,rgba(18,194,163,.2),transparent 60%),linear-gradient(135deg,rgba(22,34,60,.94),rgba(12,21,38,.94));border:1px solid rgba(18,194,163,.28);border-radius:var(--radius-lg);padding:30px;box-shadow:var(--shadow)}
.download-panel h2{font-size:23px;margin-bottom:10px}
.download-panel p{color:#c0cde5;font-size:14.5px;margin-bottom:0}
.dl-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:22px}
.dl-item{min-width:0;display:flex;flex-direction:column;gap:6px;padding:16px 18px;border-radius:var(--radius);background:rgba(6,11,22,.6);border:1px solid var(--line-strong);color:var(--text);transition:border-color .18s ease,transform .18s ease,background .18s ease,color .18s ease}
.dl-item:hover{border-color:rgba(18,194,163,.55);background:rgba(18,194,163,.1);transform:translateY(-3px);color:#fff}
.dl-item strong{font-size:15px;color:#fff}
.dl-item span{font-size:12.5px;color:var(--muted);overflow-wrap:anywhere}
/* faq */
.qa-list{display:grid;gap:12px}
.qa-item{border:1px solid var(--line);border-radius:var(--radius);background:rgba(255,255,255,.035);padding:16px 18px;transition:border-color .18s ease,background .18s ease}
.qa-item:hover{border-color:rgba(18,194,163,.34);background:rgba(18,194,163,.06)}
.qa-item h3{font-size:15.5px;margin:0 0 7px;color:#fff}
.qa-item p{margin:0;color:var(--muted);font-size:14.5px;line-height:1.78}
/* risk */
.risk-box{border:1px solid rgba(243,182,74,.32);background:rgba(243,182,74,.07);border-radius:var(--radius-lg);padding:26px}
.risk-box h2{font-size:20px;margin-bottom:10px;color:#ffd48a}
.risk-box p{color:#ddcfae;font-size:14.5px;margin-bottom:0}
/* sidebar */
.side-card{background:linear-gradient(180deg,rgba(22,34,60,.82),rgba(12,21,38,.82));border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.side-card h3{font-size:15.5px;margin-bottom:12px;color:#fff;letter-spacing:.04em}
.side-dl{display:grid;gap:8px}
.side-dl a{display:flex;flex-direction:column;gap:2px;padding:11px 13px;border-radius:var(--radius-sm);background:rgba(18,194,163,.1);border:1px solid rgba(18,194,163,.24);color:#bff3e8;font-size:14px;font-weight:600;transition:background .18s ease,border-color .18s ease,transform .18s ease}
.side-dl a:hover{background:rgba(18,194,163,.18);border-color:rgba(18,194,163,.5);color:#e7fffa;transform:translateY(-2px)}
.side-dl a span{font-size:12px;font-weight:400;color:var(--muted);overflow-wrap:anywhere}
.side-links{display:grid;gap:8px}
.side-link{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 13px;border-radius:var(--radius-sm);background:rgba(255,255,255,.045);border:1px solid transparent;color:#cfdaee;font-size:14px;transition:background .18s ease,border-color .18s ease,color .18s ease}
.side-link:hover{background:rgba(255,255,255,.09);border-color:rgba(18,194,163,.35);color:#fff}
.side-link .arrow{color:var(--brand-soft);font-size:13px}
.side-note{color:var(--muted);font-size:13.5px;line-height:1.75;margin:0}
/* section */
.section{padding:72px 0;border-top:1px solid var(--line)}
.section--alt{background:linear-gradient(180deg,#0b1424 0%,#0a1120 100%)}
/* footer */
.site-footer{background:#060b16;border-top:1px solid var(--line);padding:52px 0 26px;color:var(--muted)}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:32px}
.footer-grid > *{min-width:0}
.footer-brand{display:flex;align-items:center;gap:11px;color:#fff;margin-bottom:14px}
.footer-brand .brand-name{font-size:16px}
.footer-desc{font-size:13.5px;color:var(--muted);line-height:1.8;margin:0}
.footer-title{font-size:14.5px;color:#fff;margin-bottom:12px;letter-spacing:.04em}
.footer-links{display:grid;gap:8px}
.footer-links a{color:#a9b8d1;font-size:13.5px}
.footer-links a:hover{color:var(--brand-soft)}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px;margin-top:34px;padding-top:18px;border-top:1px solid var(--line);font-size:12.5px;color:#7b8aa6}
/* responsive */
@media (max-width:1024px){
  .article-layout{grid-template-columns:minmax(0,1fr);padding:40px 0 56px}
  .article-side{position:static;grid-template-columns:repeat(2,minmax(0,1fr));display:grid}
  .article-body{max-width:none}
  .article-hero h1{font-size:29px}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:26px}
  .cols-3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:768px){
  .nav-inner{padding:11px 18px;gap:10px}
  .nav-link{padding:8px 11px;font-size:14px}
  .article-hero{padding:32px 0 34px}
  .article-hero h1{font-size:25px}
  .article-lead{font-size:15px}
  .article-body{padding:22px 20px 12px}
  .panel,.download-panel,.risk-box{padding:22px}
  .dl-grid{grid-template-columns:minmax(0,1fr)}
  .cols-2,.cols-3{grid-template-columns:minmax(0,1fr)}
  .section{padding:52px 0}
}
@media (max-width:520px){
  .site-container{padding:0 16px}
  .topbar-inner{padding:8px 16px}
  .brand-sub{display:none}
  .brand-name{font-size:16px}
  .nav-links{width:100%;gap:4px}
  .nav-cta{margin-left:0;width:100%}
  .nav-cta .btn{width:100%}
  .article-hero h1{font-size:22px}
  .article-side{grid-template-columns:minmax(0,1fr)}
  .article-body h2{font-size:19px}
  .article-body h3{font-size:17px}
  .btn{width:100%}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}

/* roulang page: category1 */
:root{
  --bg:#080e1c;
  --bg-soft:#0b1424;
  --panel:#111c33;
  --panel-2:#16223c;
  --line:rgba(255,255,255,.08);
  --line-strong:rgba(255,255,255,.16);
  --text:#e9eefb;
  --muted:#96a5c3;
  --brand:#12c2a3;
  --brand-soft:#3ad7b8;
  --brand-deep:#0b8f79;
  --accent:#f3b64a;
  --radius-lg:20px;
  --radius:14px;
  --radius-sm:10px;
  --shadow:0 20px 44px rgba(2,7,18,.45);
  --container:1180px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,"Segoe UI",Arial,sans-serif;
  font-size:16px;
  line-height:1.78;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
img,svg{max-width:100%;height:auto;display:block;border:0}
a{color:var(--brand-soft);text-decoration:none;transition:color .18s ease}
a:hover{color:var(--accent)}
h1,h2,h3,h4{margin:0 0 12px;line-height:1.36;font-weight:700;letter-spacing:.01em}
h1{font-size:36px}
h2{font-size:28px}
h3{font-size:17.5px}
p{margin:0 0 14px}
ul,ol{margin:0;padding:0;list-style:none}
button{font-family:inherit}
::selection{background:rgba(18,194,163,.32);color:#fff}
:focus-visible{outline:2px solid var(--brand-soft);outline-offset:3px;border-radius:6px}
.site-container{width:100%;max-width:var(--container);margin:0 auto;padding:0 22px}
/* topbar */
.topbar{background:#060b16;border-bottom:1px solid var(--line);font-size:13px;color:var(--muted)}
.topbar-inner{max-width:var(--container);margin:0 auto;padding:8px 22px;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.topbar-left{display:flex;align-items:center;gap:10px;flex-wrap:wrap;min-width:0}
.topbar-dot{width:7px;height:7px;border-radius:50%;background:var(--brand);display:inline-block;flex:0 0 auto}
.topbar-links{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.topbar-links a{color:#b9c6de;font-size:13px}
.topbar-links a:hover{color:var(--brand-soft)}
/* header */
.site-header{position:sticky;top:0;z-index:60;background:rgba(8,14,28,.94);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}
.nav-inner{max-width:var(--container);margin:0 auto;padding:12px 22px;display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:11px;color:#fff;min-width:0}
.brand:hover{color:#fff}
.brand-mark{width:38px;height:38px;border-radius:11px;display:grid;place-items:center;font-weight:800;font-size:15px;color:#04140f;background:linear-gradient(135deg,var(--brand),var(--brand-deep));box-shadow:0 8px 20px rgba(18,194,163,.3);flex:0 0 auto}
.brand-text{display:flex;flex-direction:column;line-height:1.25;min-width:0}
.brand-name{font-size:17px;font-weight:700;letter-spacing:.02em}
.brand-sub{font-size:11.5px;color:var(--muted);letter-spacing:.12em}
.nav-links{display:flex;align-items:center;flex-wrap:wrap;gap:4px}
.nav-link{display:inline-flex;align-items:center;padding:9px 14px;border-radius:10px;color:#c6d2e8;font-size:14.5px;font-weight:500;white-space:nowrap;transition:background .18s ease,color .18s ease}
.nav-link:hover{background:rgba(255,255,255,.07);color:#fff}
.nav-link.active{background:rgba(18,194,163,.14);color:#6fe3cb}
.nav-cta{margin-left:6px}
.nav-cta .btn{padding:9px 18px;font-size:14px}
/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;border-radius:999px;font-size:15px;font-weight:600;border:1px solid transparent;cursor:pointer;transition:transform .18s ease,box-shadow .18s ease,background .18s ease,border-color .18s ease,color .18s ease}
.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand-deep));color:#04140f;box-shadow:0 12px 28px rgba(18,194,163,.28)}
.btn-primary:hover{color:#04140f;transform:translateY(-2px);box-shadow:0 18px 36px rgba(18,194,163,.36)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{border-color:var(--line-strong);background:rgba(255,255,255,.04);color:var(--text)}
.btn-ghost:hover{color:#fff;background:rgba(255,255,255,.1);transform:translateY(-2px)}
.btn-ghost:active{transform:translateY(0)}
.btn-block{width:100%}
/* hero */
.cat-hero{position:relative;overflow:hidden;padding:54px 0 58px;background:radial-gradient(1000px 460px at 8% -14%,rgba(18,194,163,.22),transparent 62%),radial-gradient(820px 420px at 94% -6%,rgba(66,110,232,.22),transparent 58%),linear-gradient(180deg,#0a1122 0%,#0a1020 100%);border-bottom:1px solid var(--line)}
.cat-hero::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:64px 64px;-webkit-mask-image:radial-gradient(circle at 45% 0,#000,transparent 72%);mask-image:radial-gradient(circle at 45% 0,#000,transparent 72%);pointer-events:none}
.cat-hero .site-container{position:relative;z-index:1}
.cat-hero-grid{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(0,1fr);gap:28px;align-items:start}
.cat-hero-main{min-width:0}
.hero-badge{display:inline-flex;align-items:center;gap:8px;padding:6px 14px;border-radius:999px;font-size:12.5px;letter-spacing:.06em;color:#7deed8;background:rgba(18,194,163,.12);border:1px solid rgba(18,194,163,.3);margin-bottom:18px}
.cat-hero h1{max-width:860px;margin-bottom:16px}
.hero-lead{max-width:820px;color:#c0cde5;font-size:16px;line-height:1.85;margin-bottom:24px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:26px}
.fact-row{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.fact{min-width:0;padding:14px 16px;border-radius:var(--radius);border:1px solid var(--line);background:linear-gradient(180deg,rgba(22,34,60,.86),rgba(12,21,38,.86))}
.fact-k{display:block;font-size:12.5px;color:var(--brand-soft);letter-spacing:.06em;margin-bottom:5px}
.fact-v{display:block;font-size:13.5px;color:#d5dfef;line-height:1.6}
.side-panel{min-width:0;padding:24px;border-radius:var(--radius-lg);border:1px solid var(--line-strong);background:linear-gradient(180deg,rgba(24,37,64,.96),rgba(12,21,38,.96));box-shadow:var(--shadow)}
.side-panel h2{font-size:16px;margin-bottom:6px}
.side-sub{font-size:12.5px;color:var(--muted);margin:0 0 16px}
.calc-list li{display:flex;align-items:baseline;justify-content:space-between;gap:14px;padding:10px 0;border-bottom:1px dashed var(--line);font-size:14px}
.calc-list li:last-child{border-bottom:0}
.calc-list .k{color:#cfdbf0;white-space:nowrap}
.calc-list .v{color:#7deed8;font-weight:600;text-align:right;min-width:0}
.calc-note{margin:14px 0 0;font-size:12.5px;color:var(--muted);line-height:1.7}
/* section */
.section{padding:66px 0;border-top:1px solid var(--line)}
.section--alt{background:linear-gradient(180deg,#0b1424 0%,#0a1120 100%)}
.section-head{max-width:800px;margin-bottom:32px}
.section-eyebrow{display:inline-block;font-size:12.5px;letter-spacing:.16em;color:var(--brand-soft);margin-bottom:10px}
.section-head h2{margin-bottom:12px}
.section-head p{color:var(--muted);font-size:15.5px;margin:0}
/* concept cards */
.concept-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.concept-grid > *{min-width:0}
.concept-card{padding:22px 20px;border-radius:var(--radius);border:1px solid var(--line);background:linear-gradient(180deg,rgba(22,34,60,.9),rgba(12,21,38,.9));transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease}
.concept-card:hover{transform:translateY(-3px);border-color:rgba(18,194,163,.38);box-shadow:0 16px 34px rgba(2,7,18,.5)}
.concept-num{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:9px;font-size:13px;font-weight:700;color:#04140f;background:linear-gradient(135deg,var(--brand),var(--brand-deep));margin-bottom:12px}
.concept-card h3{font-size:16px;margin-bottom:8px}
.concept-card p{font-size:13.8px;color:var(--muted);margin:0;line-height:1.75}
/* table */
.table-wrap{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--line);background:var(--panel);box-shadow:var(--shadow)}
.calc-table{width:100%;min-width:640px;border-collapse:collapse;margin:0}
.calc-table caption{text-align:left;padding:16px 18px 0;font-size:14px;color:#cfdbf0;font-weight:600}
.calc-table th,.calc-table td{padding:13px 18px;text-align:left;font-size:14px;border-bottom:1px solid var(--line);white-space:nowrap}
.calc-table thead th{background:rgba(255,255,255,.04);color:#cfdbf0;font-weight:600;font-size:13.5px;letter-spacing:.02em}
.calc-table tbody tr:last-child td{border-bottom:0}
.calc-table tbody tr:hover td{background:rgba(18,194,163,.06)}
.calc-table td.strong{color:#7deed8;font-weight:600}
.table-note{margin:0;padding:13px 18px;border-top:1px solid var(--line);font-size:12.8px;color:var(--muted);line-height:1.7}
/* scenes */
.scene-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.scene-grid > *{min-width:0}
.scene-card{padding:24px 22px;border-radius:var(--radius);border:1px solid var(--line);background:var(--panel);transition:transform .2s ease,border-color .2s ease}
.scene-card:hover{transform:translateY(-3px);border-color:rgba(18,194,163,.32)}
.scene-card h3{font-size:16.5px;margin-bottom:8px;color:#fff}
.scene-card p{font-size:14px;color:var(--muted);margin:0;line-height:1.78}
/* steps */
.steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;counter-reset:step}
.steps > *{min-width:0}
.step{position:relative;padding:22px 20px;border-radius:var(--radius);border:1px solid var(--line);background:linear-gradient(180deg,rgba(22,34,60,.78),rgba(11,20,36,.9))}
.step-num{display:inline-grid;place-items:center;width:28px;height:28px;border-radius:50%;font-size:13px;font-weight:700;color:#04140f;background:var(--brand-soft);margin-bottom:12px}
.step h3{font-size:15.5px;margin-bottom:7px}
.step p{font-size:13.6px;color:var(--muted);margin:0;line-height:1.72}
/* features */
.feature-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.feature-grid > *{min-width:0}
.feature-card{display:flex;gap:16px;padding:22px;border-radius:var(--radius);border:1px solid var(--line);background:var(--panel-2);transition:border-color .2s ease,transform .2s ease}
.feature-card:hover{border-color:rgba(243,182,74,.38);transform:translateY(-2px)}
.feature-icon{flex:0 0 auto;width:40px;height:40px;border-radius:12px;display:grid;place-items:center;font-size:14px;font-weight:700;color:var(--accent);background:rgba(243,182,74,.12);border:1px solid rgba(243,182,74,.28)}
.feature-body{min-width:0}
.feature-body h3{font-size:16px;margin-bottom:6px}
.feature-body p{font-size:13.8px;color:var(--muted);margin:0;line-height:1.75}
/* risk */
.risk-panel{padding:28px;border-radius:var(--radius-lg);border:1px solid rgba(243,182,74,.26);background:linear-gradient(180deg,rgba(38,31,16,.7),rgba(14,20,34,.9))}
.risk-list li{position:relative;padding:10px 0 10px 22px;font-size:14.2px;color:#d6dfef;border-bottom:1px dashed rgba(255,255,255,.08);line-height:1.75}
.risk-list li:last-child{border-bottom:0}
.risk-list li::before{content:"";position:absolute;left:0;top:19px;width:8px;height:8px;border-radius:2px;background:var(--accent);opacity:.85}
/* download */
.download-panel{padding:32px;border-radius:var(--radius-lg);border:1px solid var(--line-strong);background:radial-gradient(700px 300px at 12% 0,rgba(18,194,163,.18),transparent 62%),linear-gradient(180deg,rgba(23,36,62,.96),rgba(10,18,32,.96));box-shadow:var(--shadow)}
.download-head{max-width:720px;margin-bottom:24px}
.download-head h2{font-size:26px;margin-bottom:10px}
.download-head p{color:var(--muted);font-size:14.8px;margin:0}
.download-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.download-grid > *{min-width:0}
.dl-card{display:flex;flex-direction:column;gap:6px;padding:20px;border-radius:var(--radius);border:1px solid var(--line);background:rgba(8,14,28,.6);transition:border-color .2s ease,transform .2s ease}
.dl-card:hover{border-color:rgba(18,194,163,.4);transform:translateY(-3px)}
.dl-card .dl-name{font-size:12.5px;letter-spacing:.08em;color:var(--brand-soft)}
.dl-card strong{font-size:16px;color:#fff}
.dl-card span.dl-file{font-size:12.5px;color:var(--muted)}
.dl-card .btn{margin-top:10px}
.download-note{margin:18px 0 0;font-size:13px;color:var(--muted)}
/* faq */
.faq-list{max-width:920px}
.faq-item{border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);margin-bottom:12px;overflow:hidden;transition:border-color .2s ease}
.faq-item[open]{border-color:rgba(18,194,163,.34)}
.faq-item summary{list-style:none;cursor:pointer;padding:16px 20px;display:flex;align-items:center;justify-content:space-between;gap:14px;font-size:15.5px;font-weight:600;color:#fff}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";flex:0 0 auto;color:var(--brand-soft);font-size:20px;font-weight:700;line-height:1}
.faq-item[open] summary::after{content:"−"}
.faq-a{padding:0 20px 18px;font-size:14.2px;color:var(--muted);line-height:1.8;margin:0}
/* news */
.news-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.news-grid > *{min-width:0}
.news-card{display:flex;flex-direction:column;padding:22px;border-radius:var(--radius);border:1px solid var(--line);background:linear-gradient(180deg,rgba(22,34,60,.9),rgba(11,20,36,.92));transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease}
.news-card:hover{transform:translateY(-3px);border-color:rgba(18,194,163,.34);box-shadow:0 16px 34px rgba(2,7,18,.45)}
.news-meta{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:10px}
.tag{display:inline-flex;align-items:center;padding:3px 10px;border-radius:999px;font-size:12px;color:#7deed8;background:rgba(18,194,163,.12);border:1px solid rgba(18,194,163,.28)}
.news-date{font-size:12.5px;color:var(--muted)}
.news-title{font-size:16.5px;line-height:1.55;margin:0 0 8px}
.news-title a{color:#fff}
.news-title a:hover{color:var(--brand-soft)}
.news-desc{font-size:13.8px;color:var(--muted);margin:0 0 14px;line-height:1.75;flex:1 1 auto}
.news-more{font-size:13.5px;font-weight:600;color:var(--brand-soft);align-self:flex-start}
.news-more:hover{color:var(--accent)}
.news-empty{padding:26px;border-radius:var(--radius);border:1px dashed var(--line-strong);background:rgba(255,255,255,.02);color:var(--muted);font-size:14.5px;margin:0}
/* cta */
.cta-band{padding:44px 32px;border-radius:var(--radius-lg);border:1px solid rgba(18,194,163,.28);background:radial-gradient(620px 280px at 84% 10%,rgba(18,194,163,.2),transparent 62%),linear-gradient(120deg,rgba(18,36,62,.96),rgba(10,18,32,.96));display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap}
.cta-band h2{font-size:24px;margin-bottom:8px}
.cta-band p{margin:0;color:var(--muted);font-size:14.8px;max-width:640px}
.cta-actions{display:flex;gap:12px;flex-wrap:wrap}
/* footer */
.site-footer{background:#060b16;border-top:1px solid var(--line);padding:52px 0 0;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.5fr .8fr .8fr 1.1fr;gap:32px;padding-bottom:34px}
.footer-grid > *{min-width:0}
.footer-brand{display:flex;align-items:center;gap:11px;margin-bottom:14px}
.footer-desc{font-size:13.6px;color:var(--muted);line-height:1.8;margin:0}
.footer-title{font-size:14.5px;color:#fff;margin-bottom:14px;letter-spacing:.03em}
.footer-links{display:flex;flex-direction:column;gap:9px}
.footer-links a{font-size:13.8px;color:#b9c6de}
.footer-links a:hover{color:var(--brand-soft)}
.footer-bottom{border-top:1px solid var(--line);padding:16px 0 22px;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:12.8px;color:#7f8daa}
/* responsive */
@media (max-width:1024px){
  .cat-hero-grid{grid-template-columns:minmax(0,1fr)}
  .concept-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .scene-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .steps{grid-template-columns:repeat(2,minmax(0,1fr))}
  .news-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .download-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr;gap:26px}
  .footer-grid > div:last-child{grid-column:1 / -1}
  h1{font-size:31px}
  .nav-inner{gap:12px}
  .nav-link{padding:8px 11px;font-size:14px}
}
@media (max-width:768px){
  .section{padding:52px 0}
  .cat-hero{padding:42px 0 46px}
  h1{font-size:27px}
  h2{font-size:23px}
  .nav-links{width:100%;gap:6px}
  .nav-cta{margin-left:0}
  .fact-row{grid-template-columns:repeat(2,minmax(0,1fr))}
  .feature-grid{grid-template-columns:minmax(0,1fr)}
  .download-grid{grid-template-columns:minmax(0,1fr)}
  .cta-band{padding:32px 24px}
  .download-panel{padding:24px}
  .risk-panel{padding:22px}
}
@media (max-width:520px){
  .site-container{padding:0 16px}
  .topbar-inner,.nav-inner{padding-left:16px;padding-right:16px}
  h1{font-size:23px}
  h2{font-size:20px}
  .hero-lead{font-size:15px}
  .hero-actions .btn{width:100%}
  .fact-row{grid-template-columns:minmax(0,1fr)}
  .concept-grid{grid-template-columns:minmax(0,1fr)}
  .scene-grid{grid-template-columns:minmax(0,1fr)}
  .steps{grid-template-columns:minmax(0,1fr)}
  .news-grid{grid-template-columns:minmax(0,1fr)}
  .nav-cta{width:100%}
  .nav-cta .btn{width:100%}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:22px}
  .cta-actions .btn{width:100%}
  .brand-name{font-size:15.5px}
  .brand-sub{font-size:10.5px;letter-spacing:.08em}
}