/* roulang page: index */
:root{
  --brand-900:#123A52;--brand-700:#1D5474;--brand-600:#2A6A93;--brand-500:#3B85B0;--brand-100:#E7F0F6;
  --accent-600:#2C8B7F;--accent-100:#E4F3F0;--warm-500:#E07A3F;
  --bg-page:#F5F7F9;--bg-soft:#EDF2F6;--surface:#FFFFFF;
  --ink-900:#14212B;--ink-700:#334753;--ink-500:#6B7C88;--ink-300:#9DAAB3;
  --line:#E2E8ED;--line-strong:#CBD6DE;
  --r-sm:8px;--r-md:12px;--r-lg:16px;--r-xl:24px;--r-pill:999px;
  --sh-sm:0 1px 2px rgba(20,33,43,.05);
  --sh-md:0 8px 24px -12px rgba(29,84,116,.20);
  --sh-lg:0 24px 48px -24px rgba(29,84,116,.28);
  --font:-apple-system,"PingFang SC","Noto Sans SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font);background:var(--bg-page);color:var(--ink-700);font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--brand-600);text-decoration:none;transition:color .2s ease}
a:hover{color:var(--brand-700);text-decoration:underline;text-underline-offset:3px}
button{font-family:inherit}
h1,h2,h3,h4{margin:0;color:var(--ink-900);line-height:1.35;letter-spacing:-.2px;font-weight:700}
h1{font-size:40px;line-height:1.25}
h2{font-size:30px}
h3{font-size:22px;font-weight:600}
h4{font-size:18px;font-weight:600}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--brand-600);outline-offset:2px}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}
@media(min-width:1600px){.container{max-width:1280px}}
@media(max-width:767px){.container{padding:0 20px}}

/* header */
.site-header{position:sticky;top:0;z-index:60;background:#fff;border-bottom:1px solid var(--line);transition:box-shadow .22s ease,background .22s ease}
.site-header.is-scrolled{box-shadow:var(--sh-sm);background:rgba(255,255,255,.96)}
.header-inner{display:flex;align-items:center;gap:20px;height:72px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink-900);font-weight:700;font-size:17px;letter-spacing:-.3px;white-space:nowrap;text-decoration:none;flex:0 0 auto}
.brand:hover{color:var(--brand-700);text-decoration:none}
.brand-mark{width:26px;height:26px;border-radius:8px;background:var(--brand-600);display:grid;place-items:center;flex:0 0 auto}
.brand-mark svg{width:15px;height:15px;display:block}
.seg-nav{display:flex;align-items:center;gap:2px;background:var(--bg-soft);padding:4px;border-radius:var(--r-pill);margin-left:6px}
.seg-chip{display:inline-flex;align-items:center;height:36px;padding:0 15px;border-radius:var(--r-pill);font-size:14px;color:var(--ink-700);white-space:nowrap;text-decoration:none;transition:background .2s ease,color .2s ease}
.seg-chip:hover{background:var(--brand-100);color:var(--brand-700);text-decoration:none}
.seg-chip.is-active{background:#fff;color:var(--brand-700);font-weight:600;box-shadow:var(--sh-sm)}
.header-actions{margin-left:auto;display:flex;align-items:center;gap:10px;flex:0 0 auto}
@media(max-width:1099px){
  .header-inner{flex-wrap:wrap;height:auto;padding-top:10px;padding-bottom:10px;gap:10px}
  .seg-nav{order:3;width:100%;margin:0;overflow-x:auto;scrollbar-width:none;-webkit-overflow-scrolling:touch;mask-image:linear-gradient(to right,#000 92%,rgba(0,0,0,0));-webkit-mask-image:linear-gradient(to right,#000 92%,rgba(0,0,0,0))}
  .seg-nav::-webkit-scrollbar{display:none}
}
@media(max-width:575px){
  .brand{font-size:15px}
  .header-actions .btn-sm{padding:0 12px;font-size:13px}
}

/* buttons */
.btn-brand,.btn-ghost{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:44px;padding:0 22px;border-radius:var(--r-md);font-size:15px;font-weight:600;border:1px solid transparent;cursor:pointer;transition:background .2s ease,color .2s ease,border-color .2s ease,box-shadow .2s ease,transform .2s ease;text-decoration:none}
.btn-brand{background:var(--brand-600);color:#fff}
.btn-brand:hover{background:var(--brand-700);color:#fff;text-decoration:none;transform:translateY(-1px);box-shadow:var(--sh-md)}
.btn-brand:active{transform:none}
.btn-ghost{background:#fff;border-color:var(--line-strong);color:var(--ink-700)}
.btn-ghost:hover{border-color:var(--brand-500);color:var(--brand-700);text-decoration:none}
.btn-ghost:active{background:var(--bg-soft)}
.btn-sm{height:38px;padding:0 16px;font-size:14px}
.btn-block{width:100%}
.btn-text{display:inline-flex;align-items:center;gap:6px;color:var(--brand-600);font-weight:600;font-size:15px;text-decoration:none}
.btn-text::after{content:"→";transition:transform .2s ease}
.btn-text:hover{color:var(--brand-700);text-decoration:none}
.btn-text:hover::after{transform:translateX(3px)}

/* section basics */
.section{padding:88px 0}
.section-soft{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:32px;margin-bottom:40px}
.section-head p{font-size:15px;color:var(--ink-500);max-width:560px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--brand-700);background:var(--brand-100);border-radius:var(--r-pill);padding:5px 12px;margin-bottom:16px}
.chip{display:inline-flex;align-items:center;font-size:13px;font-weight:500;line-height:1.2;color:var(--brand-700);background:var(--brand-100);border-radius:var(--r-pill);padding:5px 11px}
.chip-soft{display:inline-flex;align-items:center;font-size:13px;font-weight:500;color:var(--accent-600);background:var(--accent-100);border-radius:var(--r-pill);padding:5px 11px}
@media(max-width:991px){
  .section{padding:64px 0}
  h1{font-size:32px}
  h2{font-size:26px}
  .section-head{flex-direction:column;align-items:flex-start;gap:14px;margin-bottom:32px}
}
@media(max-width:575px){
  .section{padding:48px 0}
  h1{font-size:28px}
  h2{font-size:24px}
  .btn-brand,.btn-ghost{width:100%}
}

/* hero */
.hero{position:relative;padding:64px 0 88px;overflow:hidden}
.hero::before{content:"";position:absolute;right:-180px;top:-220px;width:640px;height:640px;border-radius:50%;background:radial-gradient(circle at center,rgba(59,133,176,.16),rgba(59,133,176,0) 70%);pointer-events:none}
.hero-grid{display:grid;grid-template-columns:5fr 7fr;gap:48px;align-items:center;position:relative}
.hero h1{max-width:18em}
.hero-sub{margin-top:18px;font-size:17px;line-height:1.8;color:var(--ink-700);max-width:34em}
.hero-actions{display:flex;gap:12px;margin-top:28px;flex-wrap:wrap}
.hero-stats{display:flex;gap:40px;margin-top:36px;padding-top:26px;border-top:1px solid var(--line);flex-wrap:wrap}
.stat-num{display:block;font-size:24px;font-weight:700;color:var(--brand-700);font-variant-numeric:tabular-nums;line-height:1.2}
.stat-label{display:block;font-size:13px;color:var(--ink-500);margin-top:4px}
.hero-figure{position:relative}
.hero-figure>img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:var(--r-xl);box-shadow:var(--sh-md)}
.hero-float{position:absolute;right:-10px;bottom:-28px;width:min(280px,82%);background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--sh-lg);padding:16px 18px}
.hero-float .chip-soft{margin-bottom:10px}
.hero-float dl{margin:0;display:grid;gap:8px}
.hero-float dl div{display:flex;align-items:baseline;justify-content:space-between;gap:12px}
.hero-float dt{font-size:13px;color:var(--ink-500)}
.hero-float dd{margin:0;font-size:14px;font-weight:600;color:var(--ink-900);font-variant-numeric:tabular-nums}
@media(max-width:991px){
  .hero{padding:48px 0 64px}
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .hero-figure{order:2}
  .hero-float{position:static;width:100%;margin-top:16px;box-shadow:var(--sh-sm)}
  .hero-stats{gap:28px}
}
@media(max-width:575px){
  .hero{padding:36px 0 48px}
  .hero-actions{flex-direction:column}
  .hero-stats{gap:20px}
}

/* capability cards */
.cap-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.cap-card{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:24px;box-shadow:var(--sh-sm);transition:box-shadow .22s ease,transform .22s ease,border-color .22s ease}
.cap-card:hover{box-shadow:var(--sh-md);transform:translateY(-2px);border-color:var(--line-strong)}
.cap-num{width:40px;height:40px;border-radius:var(--r-md);background:var(--brand-100);color:var(--brand-700);font-weight:700;font-size:15px;display:grid;place-items:center;margin-bottom:16px;font-variant-numeric:tabular-nums}
.cap-card h3{font-size:18px;margin-bottom:8px}
.cap-card p{font-size:14px;color:var(--ink-500);line-height:1.7}
@media(max-width:991px){.cap-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:575px){.cap-grid{grid-template-columns:1fr}}

/* flow */
.flow-grid{display:grid;grid-template-columns:6fr 6fr;gap:56px;align-items:center}
.steps{position:relative;padding-left:28px}
.steps::before{content:"";position:absolute;left:7px;top:10px;bottom:10px;width:2px;background:var(--line)}
.step{position:relative;padding-bottom:28px}
.step:last-child{padding-bottom:0}
.step::before{content:"";position:absolute;left:-26px;top:6px;width:12px;height:12px;border-radius:50%;background:var(--brand-600);box-shadow:0 0 0 4px var(--brand-100)}
.step h3{font-size:18px;margin-bottom:6px}
.step p{font-size:14.5px;color:var(--ink-500);line-height:1.75}
.flow-note{margin-top:16px;background:var(--bg-soft);border-radius:var(--r-sm);padding:14px 16px;font-size:14px;color:var(--ink-700)}
.flow-figure img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:var(--r-xl);box-shadow:var(--sh-md)}
@media(max-width:991px){.flow-grid{grid-template-columns:1fr;gap:36px}.flow-figure{order:-1}}

/* compare table */
.table-shell{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--sh-sm)}
.table-scroll{overflow-x:auto}
.compare{width:100%;border-collapse:collapse;min-width:760px}
.compare th,.compare td{padding:0 20px;height:56px;text-align:center;border-bottom:1px solid var(--line);font-size:15px;color:var(--ink-700);font-variant-numeric:tabular-nums}
.compare thead th{background:var(--bg-soft);font-size:14px;font-weight:700;color:var(--ink-900)}
.compare th:first-child,.compare td:first-child{text-align:left;font-weight:600;color:var(--ink-900);position:sticky;left:0;background:#fff;z-index:2;min-width:170px}
.compare thead th:first-child{background:var(--bg-soft)}
.compare tbody tr:last-child td{border-bottom:0}
.compare .col-rec{background:var(--brand-100)}
.compare thead th.col-rec{background:var(--brand-100);color:var(--brand-700);box-shadow:inset 0 3px 0 var(--brand-600);position:relative}
.rec-flag{display:inline-block;margin-left:6px;font-size:12px;font-weight:500;line-height:1.2;color:#fff;background:var(--warm-500);border-radius:var(--r-pill);padding:2px 8px;vertical-align:2px}
.tick,.cross{position:relative;display:inline-block;width:18px;height:18px;border-radius:50%;vertical-align:-4px}
.tick{background:var(--brand-100)}
.tick::after{content:"";position:absolute;left:5px;top:4px;width:7px;height:4px;border-left:2px solid var(--brand-600);border-bottom:2px solid var(--brand-600);transform:rotate(-45deg)}
.cross{background:var(--bg-soft)}
.cross::after,.cross::before{content:"";position:absolute;left:5px;top:8px;width:8px;height:2px;background:var(--ink-300);border-radius:1px}
.cross::before{transform:rotate(45deg)}
.cross::after{transform:rotate(-45deg)}
.table-hint{display:none;margin-top:12px;font-size:13px;color:var(--ink-500)}
@media(max-width:767px){.table-hint{display:block}}

/* feature cards */
.feature-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.feature-card{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--sh-sm);transition:box-shadow .22s ease,transform .22s ease;display:flex;flex-direction:column}
.feature-card:hover{box-shadow:var(--sh-md);transform:translateY(-2px)}
.feature-card.large{grid-column:1 / -1}
.feature-thumb{position:relative;overflow:hidden;aspect-ratio:16/9}
.feature-card.large .feature-thumb{aspect-ratio:21/9}
.feature-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease}
.feature-card:hover .feature-thumb img{transform:scale(1.03)}
.feature-thumb .chip{position:absolute;left:14px;top:14px;background:#fff;box-shadow:var(--sh-sm)}
.feature-body{padding:22px 24px 24px}
.feature-body h3{font-size:19px;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.feature-body p{font-size:14.5px;color:var(--ink-500);line-height:1.7;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.feature-meta{margin-top:16px;display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:13px;color:var(--ink-500)}
@media(max-width:767px){
  .feature-grid{grid-template-columns:1fr}
  .feature-card.large{grid-column:auto}
  .feature-card.large .feature-thumb{aspect-ratio:16/9}
}

/* news list (CMS) */
.news-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.news-card{display:grid;grid-template-columns:34% 1fr;gap:18px;background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:16px;box-shadow:var(--sh-sm);transition:box-shadow .22s ease,transform .22s ease,border-color .22s ease}
.news-card:hover{box-shadow:var(--sh-md);transform:translateY(-2px);border-color:var(--line-strong)}
.news-thumb{overflow:hidden;border-radius:var(--r-md);aspect-ratio:4/3;background:var(--bg-soft)}
.news-thumb img{width:100%;height:100%;object-fit:cover}
.news-body{display:flex;flex-direction:column;min-width:0}
.news-body .chip{align-self:flex-start;margin-bottom:10px}
.news-body h3{font-size:17px;line-height:1.5;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-body h3 a{color:var(--ink-900)}
.news-body h3 a:hover{color:var(--brand-700);text-decoration:none}
.news-body p{font-size:14px;color:var(--ink-500);line-height:1.7;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-meta{margin-top:auto;padding-top:14px;display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:13px;color:var(--ink-500)}
.empty-state{grid-column:1 / -1;text-align:center;background:var(--bg-soft);border-radius:var(--r-lg);padding:48px 24px}
.empty-state .empty-icon{width:40px;height:40px;margin:0 auto 14px;border-radius:50%;border:2px solid var(--line-strong);border-top-color:var(--brand-500)}
.empty-state p{font-size:15px;color:var(--ink-500);margin-bottom:18px}
@media(max-width:991px){
  .news-grid{grid-template-columns:1fr}
}
@media(max-width:575px){
  .news-card{grid-template-columns:1fr}
  .news-thumb{aspect-ratio:16/9}
}

/* faq */
.faq-layout{display:grid;grid-template-columns:4fr 8fr;gap:48px;align-items:start}
.faq-intro p{font-size:15px;color:var(--ink-500);margin-top:14px;max-width:22em}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:var(--r-md);margin-bottom:12px;overflow:hidden;transition:border-color .2s ease,box-shadow .2s ease}
.faq-item.is-open{border-color:var(--brand-500);box-shadow:var(--sh-sm)}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;background:none;border:0;padding:18px 20px;font-size:16px;font-weight:600;color:var(--ink-900);text-align:left;cursor:pointer;position:relative}
.faq-q::before{content:"";position:absolute;left:0;top:16px;width:3px;height:20px;border-radius:2px;background:var(--brand-600);opacity:0;transition:opacity .2s ease}
.faq-item.is-open .faq-q{color:var(--brand-700)}
.faq-item.is-open .faq-q::before{opacity:1}
.faq-icon{position:relative;width:16px;height:16px;flex:0 0 auto}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;background:var(--brand-600);border-radius:2px}
.faq-icon::before{left:0;top:7px;width:16px;height:2px}
.faq-icon::after{left:7px;top:0;width:2px;height:16px;transition:transform .22s ease,opacity .22s ease}
.faq-item.is-open .faq-icon::after{transform:rotate(90deg);opacity:0}
.faq-a{max-height:0;overflow:hidden;transition:max-height .26s ease}
.faq-a p{padding:0 20px 20px;font-size:15px;line-height:1.8;color:var(--ink-500)}
@media(max-width:991px){.faq-layout{grid-template-columns:1fr;gap:28px}}

/* cta band */
.cta-band{background:var(--bg-soft);border-radius:var(--r-xl);padding:56px 48px;display:flex;align-items:center;justify-content:space-between;gap:36px}
.cta-band h2{margin-bottom:10px}
.cta-band p{font-size:15px;color:var(--ink-700);max-width:44em}
.cta-note{margin-top:10px;font-size:12px;color:var(--ink-500)}
.cta-actions{display:flex;gap:12px;flex-wrap:wrap;flex:0 0 auto}
@media(max-width:991px){
  .cta-band{flex-direction:column;align-items:flex-start;padding:40px 28px;gap:24px}
  .cta-actions{width:100%}
}
@media(max-width:575px){.cta-band{padding:32px 20px}.cta-actions{flex-direction:column}}

/* footer */
.site-footer{background:var(--brand-900);color:rgba(255,255,255,.72);margin-top:88px;padding-top:64px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:48px}
.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-size:17px;font-weight:700;margin-bottom:14px}
.footer-brand .brand-mark{background:rgba(255,255,255,.14)}
.footer-desc{font-size:14px;line-height:1.75;color:rgba(255,255,255,.68);max-width:26em}
.footer-quick{margin-top:16px;display:flex;gap:18px;flex-wrap:wrap}
.footer-quick a{font-size:14px}
.site-footer a{color:rgba(255,255,255,.72);text-decoration:none}
.site-footer a:hover{color:#fff;text-decoration:none}
.footer-col h4{color:#fff;font-size:15px;margin-bottom:16px;font-weight:600}
.footer-links li{margin-bottom:10px;font-size:14px}
.footer-contact p{font-size:14px;line-height:1.8;color:rgba(255,255,255,.68)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.14);padding:20px 0;font-size:13px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;color:rgba(255,255,255,.56)}
@media(max-width:991px){.footer-grid{grid-template-columns:1fr 1fr;gap:32px}}
@media(max-width:575px){
  .site-footer{padding-top:48px;margin-top:56px}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column}
}

@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{transition:none!important;animation:none!important}
  .cap-card:hover,.feature-card:hover,.news-card:hover,.btn-brand:hover{transform:none}
}

/* roulang page: category1 */
:root{
  --brand-900:#123A52;
  --brand-700:#1D5474;
  --brand-600:#2A6A93;
  --brand-500:#3B85B0;
  --brand-100:#E7F0F6;
  --accent-600:#2C8B7F;
  --accent-100:#E4F3F0;
  --warm-500:#E07A3F;
  --bg-page:#F5F7F9;
  --bg-soft:#EDF2F6;
  --surface:#FFFFFF;
  --ink-900:#14212B;
  --ink-700:#334753;
  --ink-500:#6B7C88;
  --ink-300:#9DAAB3;
  --line:#E2E8ED;
  --line-strong:#CBD6DE;
  --r-sm:8px;
  --r-md:12px;
  --r-lg:16px;
  --r-xl:24px;
  --r-pill:999px;
  --sh-sm:0 1px 2px rgba(20,33,43,.05);
  --sh-md:0 8px 24px -12px rgba(29,84,116,.20);
  --sh-lg:0 24px 48px -24px rgba(29,84,116,.28);
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:-apple-system,"PingFang SC","Noto Sans SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--ink-700);
  background:var(--bg-page);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block;border:0;}
a{color:var(--brand-600);text-decoration:none;transition:color .22s ease;}
a:hover{color:var(--brand-700);text-decoration:underline;text-underline-offset:3px;}
h1,h2,h3,h4{color:var(--ink-900);margin:0;letter-spacing:-.2px;font-weight:700;}
p{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
button{font-family:inherit;}
:focus-visible{outline:2px solid var(--brand-600);outline-offset:2px;border-radius:4px;}
.container{width:100%;max-width:1200px;margin:0 auto;padding-left:24px;padding-right:24px;}
@media (min-width:1600px){.container{max-width:1280px;}}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:1000;
  background:#fff;
  border-bottom:1px solid var(--line);
  transition:box-shadow .22s ease,background-color .22s ease;
}
.site-header.is-scrolled{box-shadow:var(--sh-sm);background:rgba(255,255,255,.96);}
.header-inner{display:flex;align-items:center;gap:20px;height:72px;}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;text-decoration:none;}
.brand:hover{text-decoration:none;}
.brand-mark{
  width:30px;height:30px;flex:0 0 30px;
  background:var(--brand-600);
  border-radius:9px;
  display:inline-flex;align-items:center;justify-content:center;
  box-shadow:var(--sh-sm);
}
.brand-mark svg{width:19px;height:19px;display:block;}
.brand-text{font-size:16px;font-weight:700;color:var(--ink-900);white-space:nowrap;letter-spacing:-.2px;}
.seg-nav{
  display:flex;align-items:center;gap:4px;
  background:var(--bg-soft);
  padding:4px;border-radius:var(--r-pill);
  margin:0 auto;
}
.seg-chip{
  display:inline-flex;align-items:center;
  height:36px;padding:0 15px;
  font-size:14px;line-height:1;color:var(--ink-700);
  border-radius:var(--r-pill);white-space:nowrap;
  transition:background-color .22s ease,color .22s ease,box-shadow .22s ease;
}
.seg-chip:hover{background:var(--brand-100);color:var(--brand-700);text-decoration:none;}
.seg-chip.is-active{background:#fff;color:var(--brand-700);font-weight:600;box-shadow:var(--sh-sm);}
.header-actions{display:flex;align-items:center;gap:10px;flex-shrink:0;}

/* ---------- Buttons ---------- */
.btn-brand,.btn-ghost{
  display:inline-flex;align-items:center;justify-content:center;
  height:40px;padding:0 18px;
  font-size:14px;font-weight:600;line-height:1;
  border-radius:var(--r-md);border:1px solid transparent;
  cursor:pointer;text-decoration:none;white-space:nowrap;
  transition:background-color .22s ease,color .22s ease,border-color .22s ease,transform .22s ease,box-shadow .22s ease;
}
.btn-brand{background:var(--brand-600);color:#fff;box-shadow:var(--sh-sm);}
.btn-brand:hover{background:var(--brand-700);color:#fff;text-decoration:none;transform:translateY(-1px);box-shadow:var(--sh-md);}
.btn-brand:active{transform:none;}
.btn-ghost{background:#fff;border-color:var(--line-strong);color:var(--ink-700);}
.btn-ghost:hover{background:#fff;border-color:var(--brand-500);color:var(--brand-700);text-decoration:none;transform:translateY(-1px);box-shadow:var(--sh-sm);}
.btn-ghost:active{transform:none;}
.btn-sm{height:38px;padding:0 16px;font-size:14px;}
.btn-lg{height:46px;padding:0 24px;font-size:15px;}

/* ---------- Chips / badges ---------- */
.chip{
  display:inline-flex;align-items:center;
  padding:4px 11px;border-radius:var(--r-pill);
  font-size:13px;font-weight:500;line-height:1.2;
  background:var(--brand-100);color:var(--brand-700);
  white-space:nowrap;
}
.chip-soft{background:var(--accent-100);color:var(--accent-600);}
.chip-warm{background:var(--warm-500);color:#fff;font-size:12px;}

/* ---------- Breadcrumb ---------- */
.crumb{padding:22px 0 0;font-size:14px;color:var(--ink-500);display:flex;flex-wrap:wrap;align-items:center;gap:6px;}
.crumb a{color:var(--ink-500);}
.crumb a:hover{color:var(--brand-700);}
.crumb .sep{color:var(--ink-300);}
.crumb .cur{color:var(--ink-500);}

/* ---------- Section rhythm ---------- */
.section{padding:88px 0;}
.section-tight{padding:56px 0;}
@media (max-width:991.98px){
  .section{padding:64px 0;}
  .section-tight{padding:44px 0;}
}
@media (max-width:575.98px){
  .section{padding:48px 0;}
  .section-tight{padding:36px 0;}
}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:32px;flex-wrap:wrap;}
.section-head h2{font-size:30px;line-height:1.35;}
.section-head .sub{font-size:14px;color:var(--ink-500);max-width:420px;}
@media (max-width:767.98px){
  .section-head h2{font-size:24px;}
}

/* ---------- Hero ---------- */
.hero-cat{position:relative;overflow:hidden;padding:28px 0 64px;}
.hero-cat::before{
  content:"";position:absolute;top:-180px;right:-140px;width:560px;height:560px;border-radius:50%;
  background:radial-gradient(circle,rgba(59,133,176,.12),rgba(59,133,176,0) 70%);
  pointer-events:none;
}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center;position:relative;}
.hero-eyebrow{margin-bottom:18px;display:flex;gap:8px;flex-wrap:wrap;}
.hero-title{font-size:40px;line-height:1.25;letter-spacing:-.6px;max-width:16em;}
.hero-lead{margin-top:18px;font-size:16px;line-height:1.8;color:var(--ink-700);max-width:44ch;}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px;}
.hero-stats{display:flex;flex-wrap:wrap;gap:36px;margin-top:36px;padding-top:26px;border-top:1px solid var(--line);}
.stat-num{font-size:24px;font-weight:700;color:var(--brand-700);font-variant-numeric:tabular-nums;line-height:1.2;}
.stat-label{font-size:13px;color:var(--ink-500);margin-top:4px;}
.hero-figure{position:relative;}
.hero-figure img{
  width:100%;aspect-ratio:4/3;object-fit:cover;
  border-radius:var(--r-xl);box-shadow:var(--sh-md);
}
.hero-note{
  position:absolute;left:-16px;bottom:-20px;
  background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);
  box-shadow:var(--sh-md);padding:14px 18px;min-width:200px;
}
.hero-note strong{display:block;font-size:15px;color:var(--ink-900);}
.hero-note span{font-size:13px;color:var(--ink-500);}
@media (max-width:991.98px){
  .hero-grid{grid-template-columns:1fr;gap:36px;}
  .hero-title{font-size:30px;max-width:none;}
  .hero-figure{order:2;}
  .hero-note{left:auto;right:12px;bottom:-16px;}
}
@media (max-width:575.98px){
  .hero-title{font-size:26px;}
  .hero-stats{gap:22px;}
  .hero-note{position:static;margin-top:16px;}
}

/* ---------- Filter chips ---------- */
.filter-bar{
  display:flex;gap:8px;overflow-x:auto;padding:4px 0 6px;
  scrollbar-width:none;
  -webkit-mask-image:linear-gradient(to right,#000 calc(100% - 28px),transparent);
  mask-image:linear-gradient(to right,#000 calc(100% - 28px),transparent);
}
.filter-bar::-webkit-scrollbar{display:none;}
.chip-filter{
  display:inline-flex;align-items:center;height:32px;padding:0 14px;
  font-size:13px;font-weight:500;color:var(--ink-700);
  background:#fff;border:1px solid var(--line);border-radius:var(--r-pill);
  white-space:nowrap;transition:all .22s ease;
}
.chip-filter:hover{border-color:var(--brand-500);color:var(--brand-700);text-decoration:none;}
.chip-filter.is-active{background:var(--brand-600);border-color:var(--brand-600);color:#fff;}

/* ---------- Number cards ---------- */
.num-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.num-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:26px 24px;box-shadow:var(--sh-sm);
  transition:box-shadow .22s ease,transform .22s ease;
}
.num-card:hover{box-shadow:var(--sh-md);transform:translateY(-2px);}
.num-badge{
  width:40px;height:40px;border-radius:10px;
  background:var(--brand-100);color:var(--brand-700);
  display:flex;align-items:center;justify-content:center;
  font-size:15px;font-weight:700;font-variant-numeric:tabular-nums;
  margin-bottom:18px;
}
.num-card h3{font-size:19px;line-height:1.45;margin-bottom:10px;}
.num-card p{font-size:14px;line-height:1.8;color:var(--ink-500);}
@media (max-width:991.98px){.num-grid{grid-template-columns:1fr;}}

/* ---------- Scene list ---------- */
.scene-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;}
.scene-card{
  display:flex;gap:20px;align-items:center;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:20px;box-shadow:var(--sh-sm);
  transition:box-shadow .22s ease,transform .22s ease;
}
.scene-card:hover{box-shadow:var(--sh-md);transform:translateY(-2px);}
.scene-card img{
  width:34%;flex:0 0 34%;aspect-ratio:4/3;object-fit:cover;
  border-radius:var(--r-md);
}
.scene-body h3{font-size:18px;line-height:1.45;margin:8px 0 8px;}
.scene-body p{font-size:14px;line-height:1.8;color:var(--ink-500);}
@media (max-width:991.98px){.scene-grid{grid-template-columns:1fr;}}
@media (max-width:575.98px){
  .scene-card{flex-direction:column;align-items:flex-start;}
  .scene-card img{width:100%;flex:none;aspect-ratio:16/9;}
}

/* ---------- Steps ---------- */
.steps-wrap{display:grid;grid-template-columns:1fr .62fr;gap:48px;align-items:start;}
.step-list{position:relative;padding-left:0;}
.step-list::before{
  content:"";position:absolute;left:5px;top:14px;bottom:26px;width:2px;background:var(--line-strong);
}
.step{position:relative;padding-left:36px;margin-bottom:18px;}
.step:last-child{margin-bottom:0;}
.step-dot{
  position:absolute;left:0;top:24px;width:12px;height:12px;border-radius:50%;
  background:var(--brand-600);box-shadow:0 0 0 4px var(--brand-100);
}
.step-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);
  padding:20px 22px;box-shadow:var(--sh-sm);
  transition:box-shadow .22s ease;
}
.step-card:hover{box-shadow:var(--sh-md);}
.step-card h3{font-size:17px;line-height:1.5;margin-bottom:6px;}
.step-card h3 em{font-style:normal;color:var(--brand-600);font-variant-numeric:tabular-nums;margin-right:8px;}
.step-card p{font-size:14px;line-height:1.8;color:var(--ink-500);}
.step-tip{
  margin-top:12px;background:var(--bg-soft);border-radius:var(--r-sm);
  padding:10px 12px;font-size:13px;line-height:1.7;color:var(--ink-700);
}
.side-panel{
  position:sticky;top:96px;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:24px;box-shadow:var(--sh-sm);
}
.side-panel h3{font-size:18px;margin-bottom:16px;}
.side-list li{
  display:flex;gap:10px;font-size:14px;line-height:1.75;color:var(--ink-700);
  padding:10px 0;border-bottom:1px dashed var(--line);
}
.side-list li:last-child{border-bottom:0;padding-bottom:0;}
.side-list .dot{color:var(--brand-600);font-weight:700;font-variant-numeric:tabular-nums;}
.side-cta{
  margin-top:20px;background:var(--brand-100);border-radius:var(--r-md);
  padding:18px;text-align:left;
}
.side-cta h4{font-size:16px;margin-bottom:6px;}
.side-cta p{font-size:13px;color:var(--ink-700);margin-bottom:14px;line-height:1.7;}
@media (max-width:1199.98px){
  .steps-wrap{grid-template-columns:1fr;gap:32px;}
  .side-panel{position:static;}
}

/* ---------- FAQ ---------- */
.faq-layout{display:grid;grid-template-columns:4fr 8fr;gap:48px;align-items:start;}
.faq-item{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);
  margin-bottom:12px;box-shadow:var(--sh-sm);overflow:hidden;
  transition:box-shadow .22s ease,border-color .22s ease;
}
.faq-item:hover{box-shadow:var(--sh-md);}
.faq-item summary{
  list-style:none;cursor:pointer;position:relative;
  padding:18px 52px 18px 20px;
  font-size:16px;font-weight:600;color:var(--ink-900);line-height:1.6;
  transition:color .22s ease;
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{
  content:"+";position:absolute;right:20px;top:50%;transform:translateY(-50%);
  font-size:20px;font-weight:400;color:var(--brand-600);line-height:1;
  transition:transform .22s ease,color .22s ease;
}
.faq-item[open] summary{color:var(--brand-700);}
.faq-item[open] summary::after{content:"−";}
.faq-item[open]{border-color:var(--line-strong);}
.faq-body{padding:0 20px 20px;font-size:15px;line-height:1.8;color:var(--ink-500);}
@media (max-width:991.98px){.faq-layout{grid-template-columns:1fr;gap:24px;}}

/* ---------- Read more cards ---------- */
.link-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.link-card{
  display:block;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--sh-sm);
  transition:box-shadow .22s ease,transform .22s ease;color:inherit;text-decoration:none;
}
.link-card:hover{box-shadow:var(--sh-md);transform:translateY(-2px);text-decoration:none;}
.link-card img{width:100%;aspect-ratio:16/9;object-fit:cover;}
.link-card-body{padding:20px;}
.link-card-body h3{font-size:17px;line-height:1.5;margin:10px 0 8px;color:var(--ink-900);}
.link-card-body p{font-size:14px;line-height:1.75;color:var(--ink-500);}
.link-card .arrow{display:inline-flex;align-items:center;gap:6px;font-size:14px;color:var(--brand-600);font-weight:600;margin-top:14px;}
.link-card:hover .arrow{color:var(--brand-700);}
@media (max-width:991.98px){.link-grid{grid-template-columns:1fr;}}

/* ---------- CTA ---------- */
.cta-band{
  background:var(--bg-soft);border-radius:var(--r-xl);
  padding:56px 48px;display:flex;align-items:center;justify-content:space-between;gap:36px;flex-wrap:wrap;
}
.cta-band h2{font-size:30px;line-height:1.35;margin-bottom:12px;}
.cta-band p{font-size:15px;color:var(--ink-700);max-width:56ch;}
.cta-band .note{font-size:12px;color:var(--ink-500);margin-top:12px;}
.cta-actions{display:flex;gap:12px;flex-wrap:wrap;}
@media (max-width:991.98px){.cta-band{padding:40px 28px;}}
@media (max-width:575.98px){
  .cta-band h2{font-size:24px;}
  .cta-actions{width:100%;}
  .cta-actions .btn-brand,.cta-actions .btn-ghost{flex:1 1 100%;}
}

/* ---------- Footer ---------- */
.site-footer{background:var(--brand-900);color:rgba(255,255,255,.78);margin-top:88px;padding:64px 0 28px;border-top:1px solid rgba(255,255,255,.12);}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px;}
.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;font-size:16px;margin-bottom:14px;}
.footer-brand .brand-mark{background:var(--brand-600);}
.footer-desc{font-size:14px;line-height:1.8;color:rgba(255,255,255,.72);max-width:30ch;}
.footer-quick{display:flex;flex-wrap:wrap;gap:14px;margin-top:18px;}
.footer-quick a{font-size:13px;color:rgba(255,255,255,.72);}
.footer-quick a:hover{color:#fff;text-decoration:none;}
.footer-col h4{color:#fff;font-size:15px;margin-bottom:16px;font-weight:600;}
.footer-links li{margin-bottom:10px;}
.footer-links a{font-size:14px;color:rgba(255,255,255,.72);}
.footer-links a:hover{color:#fff;text-decoration:none;}
.footer-contact p{font-size:13px;line-height:1.8;color:rgba(255,255,255,.72);}
.footer-bottom{
  margin-top:44px;padding-top:20px;border-top:1px solid rgba(255,255,255,.12);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:rgba(255,255,255,.6);
}
@media (max-width:991.98px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .site-footer{margin-top:64px;}
}
@media (max-width:575.98px){
  .footer-grid{grid-template-columns:1fr;}
  .site-footer{padding:48px 0 24px;}
}

/* ---------- Responsive header ---------- */
@media (max-width:991.98px){
  .header-inner{height:auto;flex-wrap:wrap;padding-top:12px;padding-bottom:12px;row-gap:10px;}
  .brand{order:1;}
  .header-actions{order:2;margin-left:auto;}
  .header-actions .btn-ghost{display:none;}
  .seg-nav{
    order:3;width:100%;margin:0;overflow-x:auto;
    scrollbar-width:none;
    -webkit-mask-image:linear-gradient(to right,#000 calc(100% - 28px),transparent);
    mask-image:linear-gradient(to right,#000 calc(100% - 28px),transparent);
  }
  .seg-nav::-webkit-scrollbar{display:none;}
}
@media (max-width:575.98px){
  .brand-text{font-size:14px;}
  .container{padding-left:20px;padding-right:20px;}
  .cta-band{padding:36px 22px;}
}

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

/* roulang page: article */
:root{
  --brand-900:#123A52;
  --brand-800:#173F5A;
  --brand-700:#1D5474;
  --brand-600:#2A6A93;
  --brand-500:#3B85B0;
  --brand-100:#E7F0F6;
  --brand-050:#F2F7FA;
  --accent-600:#2C8B7F;
  --accent-100:#E4F3F0;
  --warm-500:#E07A3F;
  --bg-page:#F5F7F9;
  --bg-soft:#EDF2F6;
  --surface:#FFFFFF;
  --ink-900:#14212B;
  --ink-700:#334753;
  --ink-500:#6B7C88;
  --ink-300:#9DAAB3;
  --line:#E2E8ED;
  --line-strong:#CBD6DE;
  --danger:#C2412D;
  --r-sm:8px;
  --r-md:12px;
  --r-lg:16px;
  --r-xl:24px;
  --r-pill:999px;
  --sh-sm:0 1px 2px rgba(20,33,43,.05);
  --sh-md:0 8px 24px -12px rgba(29,84,116,.20);
  --sh-lg:0 24px 48px -24px rgba(29,84,116,.28);
  --ease:.22s ease;
  --bs-body-color:var(--ink-700);
  --bs-body-bg:var(--bg-page);
  --bs-border-color:var(--line);
  --bs-border-radius:var(--r-md);
  --bs-primary:var(--brand-600);
  --bs-link-color:var(--brand-600);
  --bs-link-hover-color:var(--brand-700);
  --bs-font-sans-serif:-apple-system,"PingFang SC","Noto Sans SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:-apple-system,"PingFang SC","Noto Sans SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--ink-700);
  background:var(--bg-page);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto}
a{color:var(--brand-600);text-decoration:none;transition:color var(--ease),border-color var(--ease),background var(--ease)}
a:hover{color:var(--brand-700);text-decoration:underline;text-underline-offset:3px}
button{font-family:inherit}
h1,h2,h3,h4{margin:0;color:var(--ink-900);letter-spacing:-.2px;font-weight:700}
p{margin:0}
a:focus-visible,button:focus-visible,summary:focus-visible,.btn-brand:focus-visible,.btn-ghost:focus-visible{
  outline:2px solid var(--brand-600);
  outline-offset:2px;
  border-radius:var(--r-sm);
}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}
.skip-link{position:absolute;left:-9999px;top:0;background:var(--brand-700);color:#fff;padding:10px 18px;border-radius:0 0 var(--r-md) 0;z-index:2000}
.skip-link:focus{left:0;color:#fff}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:1000;
  background:rgba(255,255,255,.96);
  border-bottom:1px solid var(--line);
  transition:box-shadow var(--ease);
}
.site-header.is-scrolled{box-shadow:0 6px 20px -14px rgba(20,33,43,.38)}
.header-inner{display:flex;align-items:center;gap:20px;height:72px}
.brand{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto;color:var(--ink-900);font-weight:700;font-size:17px}
.brand:hover{color:var(--brand-700);text-decoration:none}
.brand-mark{
  display:inline-flex;align-items:center;justify-content:center;
  width:32px;height:32px;border-radius:9px;background:var(--brand-600);flex:0 0 auto;
}
.brand-mark svg{width:20px;height:20px}
.brand-text{white-space:nowrap}
.seg-nav{
  display:flex;align-items:center;gap:4px;
  background:var(--bg-soft);padding:4px;border-radius:var(--r-pill);
  overflow-x:auto;scrollbar-width:none;
}
.seg-nav::-webkit-scrollbar{display:none}
.seg-chip{
  display:inline-flex;align-items:center;height:36px;padding:0 16px;
  border-radius:var(--r-pill);font-size:14px;color:var(--ink-700);
  white-space:nowrap;transition:background var(--ease),color var(--ease);
}
.seg-chip:hover{background:var(--brand-100);color:var(--brand-700);text-decoration:none}
.seg-chip.is-active{background:#fff;color:var(--brand-700);font-weight:600;box-shadow:var(--sh-sm)}
.header-actions{display:flex;align-items:center;gap:10px;margin-left:auto;flex:0 0 auto}
.nav-toggle{
  display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;
  width:42px;height:42px;margin-left:auto;border-radius:var(--r-md);
  border:1px solid var(--line-strong);background:#fff;cursor:pointer;
}
.nav-toggle span{width:18px;height:2px;border-radius:2px;background:var(--ink-700);display:block}

/* ---------- buttons ---------- */
.btn-brand,.btn-ghost{
  display:inline-flex;align-items:center;justify-content:center;
  height:44px;padding:0 22px;border-radius:var(--r-md);
  font-size:15px;font-weight:600;line-height:1;
  transition:background var(--ease),color var(--ease),border-color var(--ease),box-shadow var(--ease),transform var(--ease);
}
.btn-brand{background:var(--brand-600);color:#fff;border:1px solid var(--brand-600)}
.btn-brand:hover{background:var(--brand-700);border-color:var(--brand-700);color:#fff;text-decoration:none;transform:translateY(-1px);box-shadow:var(--sh-md)}
.btn-brand:active{transform:none}
.btn-ghost{background:#fff;color:var(--ink-700);border:1px solid var(--line-strong)}
.btn-ghost:hover{border-color:var(--brand-500);color:var(--brand-700);text-decoration:none;transform:translateY(-1px);box-shadow:var(--sh-sm)}
.btn-ghost:active{transform:none}
.btn-sm{height:40px;padding:0 16px;font-size:14px}

/* ---------- mobile drawer ---------- */
.mobile-drawer{
  position:fixed;top:0;right:0;width:min(82vw,360px);height:100%;
  background:#fff;z-index:1200;display:flex;flex-direction:column;
  transform:translateX(105%);transition:transform .24s ease;
  box-shadow:-8px 0 32px rgba(20,33,43,.16);
}
.mobile-drawer.is-open{transform:translateX(0)}
.drawer-backdrop{
  position:fixed;inset:0;background:rgba(18,58,82,.42);
  opacity:0;pointer-events:none;transition:opacity .24s ease;z-index:1100;
}
.drawer-backdrop.is-open{opacity:1;pointer-events:auto}
.drawer-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:18px 20px;border-bottom:1px solid var(--line)}
.drawer-head .brand-text{font-size:16px;font-weight:700;color:var(--ink-900)}
.drawer-close{
  width:36px;height:36px;border-radius:var(--r-sm);border:1px solid var(--line);
  background:#fff;color:var(--ink-700);display:inline-flex;align-items:center;justify-content:center;cursor:pointer;
}
.drawer-nav{display:flex;flex-direction:column;padding:8px 0;overflow-y:auto;flex:1 1 auto}
.drawer-link{
  display:flex;align-items:center;min-height:48px;padding:0 20px;
  font-size:15px;color:var(--ink-700);border-bottom:1px solid var(--line);
}
.drawer-link:hover{background:var(--brand-050);color:var(--brand-700);text-decoration:none}
.drawer-link.is-active{color:var(--brand-700);font-weight:600;background:var(--brand-050)}
.drawer-foot{padding:16px 20px 24px;border-top:1px solid var(--line)}
.drawer-foot .btn-brand{width:100%}

/* ---------- article head ---------- */
.article-head{padding:32px 0 0}
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:14px;color:var(--ink-500);margin-bottom:22px}
.crumbs a{color:var(--ink-500)}
.crumbs a:hover{color:var(--brand-600);text-decoration:none}
.crumbs .sep{color:var(--ink-300)}
.crumbs .current{color:var(--ink-500)}
.article-title{font-size:32px;line-height:1.35;max-width:860px;margin-bottom:18px}
.article-meta{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:14px;color:var(--ink-500)}
.chip{
  display:inline-flex;align-items:center;height:26px;padding:0 11px;
  border-radius:var(--r-pill);background:var(--brand-100);color:var(--brand-700);
  font-size:13px;font-weight:500;line-height:1;
}
.chip:hover{background:#D9E8F2;color:var(--brand-700);text-decoration:none}
.dot-sep{color:var(--ink-300)}
.article-divider{height:1px;background:var(--line);margin:24px 0 0}

/* ---------- layout ---------- */
.article-wrap{padding:28px 0 0}
.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:48px;align-items:start}
.article-main{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:36px 40px 32px;box-shadow:var(--sh-sm);min-width:0;
}
.article-body{font-size:17px;line-height:1.9;color:var(--ink-700);max-width:760px}
.article-body > *:first-child{margin-top:0}
.article-body p{margin:0 0 1.2em}
.article-body h2{
  font-size:24px;line-height:1.4;margin:48px 0 16px;padding-left:12px;
  border-left:4px solid var(--brand-600);
}
.article-body h3{font-size:19px;line-height:1.45;margin:32px 0 12px;font-weight:700}
.article-body h4{font-size:17px;margin:24px 0 10px;font-weight:600}
.article-body ul{margin:0 0 1.2em;padding-left:20px;list-style:none}
.article-body ul li{position:relative;padding-left:14px;margin-bottom:10px}
.article-body ul li::before{
  content:"";position:absolute;left:0;top:.78em;width:6px;height:6px;border-radius:50%;background:var(--brand-600);
}
.article-body ol{margin:0 0 1.2em;padding-left:24px}
.article-body ol li{margin-bottom:10px}
.article-body ol li::marker{color:var(--brand-600);font-weight:600}
.article-body blockquote{
  margin:24px 0;padding:18px 22px;background:var(--bg-soft);
  border-left:4px solid var(--brand-500);border-radius:var(--r-sm);
  font-size:16px;line-height:1.8;color:var(--ink-700);
}
.article-body blockquote p:last-child{margin-bottom:0}
.article-body img{border-radius:var(--r-md);margin:24px auto}
.article-body figure{margin:24px 0}
.article-body figcaption{font-size:13px;color:var(--ink-500);text-align:center;margin-top:8px}
.article-body a{color:var(--brand-600);text-decoration:underline;text-underline-offset:3px}
.article-body a:hover{color:var(--brand-700)}
.article-body table{width:100%;border-collapse:collapse;margin:24px 0;font-size:15px}
.article-body th,.article-body td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--line)}
.article-body thead th{background:var(--bg-soft);color:var(--ink-900);font-weight:600}
.article-body strong{color:var(--ink-900)}

.empty-state{
  padding:48px 24px;text-align:center;border:1px dashed var(--line-strong);
  border-radius:var(--r-lg);background:var(--bg-soft);
}
.empty-icon{
  width:48px;height:48px;margin:0 auto 16px;border-radius:14px;
  background:#fff;border:1px solid var(--line);display:flex;align-items:center;justify-content:center;
}
.empty-icon svg{width:22px;height:22px;stroke:var(--brand-600)}
.empty-state h2{font-size:20px;margin-bottom:10px}
.empty-state p{font-size:15px;color:var(--ink-500);margin:0 auto 22px;max-width:420px}

.tag-group{display:flex;flex-wrap:wrap;gap:10px;margin-top:36px}
.tag{
  display:inline-flex;align-items:center;height:30px;padding:0 14px;
  border-radius:var(--r-pill);background:var(--brand-050);border:1px solid var(--line);
  color:var(--brand-700);font-size:13px;
}
.tag:hover{background:var(--brand-100);text-decoration:none}
.article-actions{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;
  margin-top:26px;padding-top:24px;border-top:1px solid var(--line);
}
.action-hint{font-size:13px;color:var(--ink-500)}

/* ---------- sidebar ---------- */
.article-side{position:sticky;top:96px;display:grid;gap:20px;min-width:0}
.side-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:20px;box-shadow:var(--sh-sm);
}
.side-card h2{font-size:15px;font-weight:700;margin-bottom:14px;color:var(--ink-900)}
.side-meta{list-style:none;margin:0;padding:0;display:grid;gap:10px;font-size:14px}
.side-meta li{display:flex;justify-content:space-between;gap:12px;color:var(--ink-500)}
.side-meta li span:last-child{color:var(--ink-900);font-weight:600;text-align:right}
.side-rel{display:grid;gap:14px}
.rel-item{display:flex;gap:12px;align-items:flex-start}
.rel-item img{width:56px;height:56px;object-fit:cover;border-radius:var(--r-sm);flex:0 0 auto}
.rel-item a{font-size:14px;line-height:1.5;font-weight:600;color:var(--ink-900);display:block}
.rel-item a:hover{color:var(--brand-700);text-decoration:none}
.rel-item span{display:block;font-size:12px;color:var(--ink-500);margin-top:4px}
.side-cta{background:var(--brand-100);border-color:#D8E7F1}
.side-cta h2{color:var(--brand-900)}
.side-cta p{font-size:14px;line-height:1.7;color:var(--brand-700);margin-bottom:16px}
.side-cta .btn-brand{width:100%;height:40px;font-size:14px}

/* ---------- blocks ---------- */
.block{padding:64px 0 0}
.block-head{margin-bottom:28px;max-width:720px}
.block-head h2{font-size:30px;line-height:1.35;margin-bottom:10px}
.block-head p{font-size:15px;color:var(--ink-500);line-height:1.75}
.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.rel-card{
  display:flex;flex-direction:column;background:var(--surface);
  border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;
  box-shadow:var(--sh-sm);transition:box-shadow var(--ease),transform var(--ease);
}
.rel-card:hover{box-shadow:var(--sh-md);transform:translateY(-2px);text-decoration:none}
.rel-card .thumb{aspect-ratio:16/9;overflow:hidden;background:var(--bg-soft)}
.rel-card .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease}
.rel-card:hover .thumb img{transform:scale(1.03)}
.rel-card .body{padding:20px;display:flex;flex-direction:column;gap:10px}
.rel-card h3{font-size:17px;line-height:1.5;color:var(--ink-900)}
.rel-card p{font-size:14px;line-height:1.7;color:var(--ink-500)}
.rel-card .more{font-size:14px;font-weight:600;color:var(--brand-600);margin-top:auto}

.qa-list{display:grid;gap:12px;max-width:860px}
.qa-item{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);box-shadow:var(--sh-sm);overflow:hidden}
.qa-item summary{
  list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px 20px;font-size:16px;font-weight:600;color:var(--ink-900);transition:color var(--ease);
}
.qa-item summary::-webkit-details-marker{display:none}
.qa-item summary::after{content:"+";font-size:20px;line-height:1;color:var(--brand-600);flex:0 0 auto}
.qa-item[open] summary{color:var(--brand-700)}
.qa-item[open] summary::after{content:"−"}
.qa-body{padding:0 20px 20px;font-size:15px;line-height:1.8;color:var(--ink-500)}

.cta-band{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:28px;
  background:var(--bg-soft);border-radius:var(--r-xl);padding:48px;
}
.cta-band h2{font-size:26px;margin-bottom:10px}
.cta-band p{font-size:15px;color:var(--ink-500);max-width:520px}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px}

/* ---------- footer ---------- */
.site-footer{background:var(--brand-900);color:rgba(255,255,255,.72);margin-top:72px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.3fr;gap:40px;padding:56px 0 40px}
.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;font-size:17px;margin-bottom:16px}
.footer-brand .brand-mark{background:rgba(255,255,255,.16)}
.footer-desc{font-size:14px;line-height:1.8;color:rgba(255,255,255,.72);margin-bottom:18px;max-width:320px}
.footer-quick{display:flex;flex-wrap:wrap;gap:18px;font-size:14px}
.footer-quick a{color:rgba(255,255,255,.72)}
.footer-quick a:hover{color:#fff;text-decoration:none}
.footer-col h4{color:#fff;font-size:15px;font-weight:600;margin-bottom:14px}
.footer-links{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.footer-links a{color:rgba(255,255,255,.72);font-size:14px}
.footer-links a:hover{color:#fff;text-decoration:none}
.footer-contact p{font-size:14px;line-height:1.8;color:rgba(255,255,255,.72)}
.footer-bottom{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;
  border-top:1px solid rgba(255,255,255,.14);padding:20px 0 28px;
  font-size:13px;color:rgba(255,255,255,.6);
}

/* ---------- responsive ---------- */
@media (min-width:1600px){
  .container{max-width:1280px}
}
@media (max-width:1199.98px){
  .article-layout{grid-template-columns:minmax(0,1fr)}
  .article-side{position:static;grid-template-columns:repeat(2,minmax(0,1fr))}
  .article-body{max-width:none}
}
@media (max-width:991.98px){
  .seg-nav,.header-actions{display:none}
  .nav-toggle{display:inline-flex}
  .header-inner{height:60px}
  .block{padding-top:48px}
  .cta-band{padding:36px 28px}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:32px;padding:44px 0 32px}
}
@media (min-width:992px){
  .mobile-drawer,.drawer-backdrop{display:none}
}
@media (max-width:767.98px){
  .container{padding:0 20px}
  .article-title{font-size:26px}
  .article-main{padding:24px 20px}
  .article-body{font-size:16px;line-height:1.85}
  .article-body h2{font-size:21px;margin-top:36px}
  .article-body h3{font-size:18px;margin-top:26px}
  .article-head{padding-top:24px}
  .related-grid{grid-template-columns:minmax(0,1fr)}
  .block-head h2{font-size:24px}
  .article-side{grid-template-columns:minmax(0,1fr)}
  .cta-band{padding:30px 22px;border-radius:var(--r-lg)}
  .cta-band h2{font-size:22px}
  .cta-actions{width:100%}
  .cta-actions .btn-brand,.cta-actions .btn-ghost{flex:1 1 auto}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:28px}
  .site-footer{margin-top:48px}
}
@media (max-width:575.98px){
  .article-actions{flex-direction:column;align-items:stretch}
  .article-actions .btn-ghost{width:100%}
  .action-hint{text-align:center}
  .cta-actions{flex-direction:column}
  .cta-actions .btn-brand,.cta-actions .btn-ghost{width:100%}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{transition:none !important;animation:none !important}
  .rel-card:hover{transform:none}
}

/* roulang page: category2 */
:root{
  --brand-900:#123A52;--brand-700:#1D5474;--brand-600:#2A6A93;--brand-500:#3B85B0;--brand-100:#E7F0F6;
  --accent-600:#2C8B7F;--accent-100:#E4F3F0;--warm-500:#E07A3F;
  --bg-page:#F5F7F9;--bg-soft:#EDF2F6;--surface:#FFFFFF;
  --ink-900:#14212B;--ink-700:#334753;--ink-500:#6B7C88;--ink-300:#9DAAB3;
  --line:#E2E8ED;--line-strong:#CBD6DE;
  --r-sm:8px;--r-md:12px;--r-lg:16px;--r-xl:24px;--r-pill:999px;
  --sh-sm:0 1px 2px rgba(20,33,43,.05);
  --sh-md:0 8px 24px -12px rgba(29,84,116,.20);
  --sh-lg:0 24px 48px -24px rgba(29,84,116,.28);
  --bs-primary:#2A6A93;--bs-body-color:#334753;--bs-body-bg:#F5F7F9;
  --bs-border-color:#E2E8ED;--bs-border-radius:12px;
  --bs-link-color:#2A6A93;--bs-link-hover-color:#1D5474;
  --bs-font-sans-serif:-apple-system,"PingFang SC","Noto Sans SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
}
[data-bs-theme=light]{--bs-primary:#2A6A93;--bs-body-color:#334753;--bs-body-bg:#F5F7F9;--bs-border-color:#E2E8ED;}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;font-family:-apple-system,"PingFang SC","Noto Sans SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  background:var(--bg-page);color:var(--ink-700);font-size:16px;line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{margin:0;color:var(--ink-900);font-weight:700;letter-spacing:-0.2px;line-height:1.35;}
p{margin:0;}
a{color:var(--brand-600);text-decoration:none;transition:color .18s ease;}
a:hover{color:var(--brand-700);text-decoration:underline;text-underline-offset:3px;}
img{max-width:100%;display:block;height:auto;}
button{font-family:inherit;}
:focus-visible{outline:2px solid var(--brand-600);outline-offset:2px;}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px;}
@media (min-width:1600px){.container{max-width:1280px;}}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:1030;background:#fff;border-bottom:1px solid var(--line);
  transition:box-shadow .22s ease,background .22s ease;
}
.site-header.is-scrolled{box-shadow:var(--sh-sm);background:rgba(255,255,255,.97);}
.header-inner{display:flex;align-items:center;gap:20px;min-height:72px;}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;color:var(--ink-900);font-weight:700;font-size:17px;letter-spacing:-.2px;}
.brand:hover{text-decoration:none;color:var(--brand-700);}
.brand-mark{width:28px;height:28px;border-radius:9px;background:var(--brand-600);display:grid;place-items:center;flex:0 0 28px;}
.brand-mark svg{width:18px;height:18px;display:block;}
.seg-nav{
  display:flex;align-items:center;gap:2px;background:var(--bg-soft);padding:4px;
  border-radius:var(--r-pill);margin-left:auto;margin-right:auto;
}
.seg-chip{
  display:inline-flex;align-items:center;height:36px;padding:0 16px;border-radius:var(--r-pill);
  font-size:14px;color:var(--ink-700);white-space:nowrap;transition:background .2s ease,color .2s ease;
}
.seg-chip:hover{background:var(--brand-100);color:var(--brand-700);text-decoration:none;}
.seg-chip.is-active{background:#fff;color:var(--brand-700);box-shadow:var(--sh-sm);font-weight:600;}
.header-actions{display:flex;align-items:center;gap:10px;flex-shrink:0;}

/* ---------- Buttons ---------- */
.btn-brand,.btn-ghost{
  display:inline-flex;align-items:center;justify-content:center;height:44px;padding:0 22px;
  border-radius:var(--r-md);font-size:15px;font-weight:600;border:1px solid transparent;
  transition:background .2s ease,color .2s ease,box-shadow .2s ease,transform .2s ease,border-color .2s ease;
  cursor:pointer;white-space:nowrap;
}
.btn-brand{background:var(--brand-600);color:#fff;}
.btn-brand:hover{background:var(--brand-700);color:#fff;text-decoration:none;transform:translateY(-1px);box-shadow:var(--sh-md);}
.btn-brand:active{transform:none;}
.btn-ghost{background:#fff;border-color:var(--line-strong);color:var(--ink-700);}
.btn-ghost:hover{border-color:var(--brand-500);color:var(--brand-700);text-decoration:none;transform:translateY(-1px);}
.btn-ghost:active{transform:none;}
.btn-sm{height:38px;padding:0 16px;font-size:14px;}
.link-arrow{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--brand-600);}
.link-arrow::after{content:"→";transition:transform .2s ease;}
.link-arrow:hover{text-decoration:none;color:var(--brand-700);}
.link-arrow:hover::after{transform:translateX(3px);}

/* ---------- Hero ---------- */
.page-hero{
  position:relative;padding:36px 0 56px;overflow:hidden;border-bottom:1px solid var(--line);
  background:
    radial-gradient(900px 420px at 88% -12%, rgba(59,133,176,.10), transparent 70%),
    linear-gradient(180deg,#FFFFFF 0%, var(--bg-page) 100%);
}
.page-crumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:14px;color:var(--ink-500);margin-bottom:26px;padding:0;list-style:none;}
.page-crumb a{color:var(--ink-500);}
.page-crumb a:hover{color:var(--brand-700);}
.page-crumb .sep{color:var(--ink-300);}
.page-crumb .current{color:var(--ink-500);}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);gap:52px;align-items:center;}
.eyebrow{
  display:inline-flex;align-items:center;height:28px;padding:0 14px;border-radius:var(--r-pill);
  background:var(--brand-100);color:var(--brand-700);font-size:13px;font-weight:600;margin-bottom:18px;
}
.hero-copy h1{font-size:40px;line-height:1.25;font-weight:700;max-width:18em;}
.hero-sub{margin-top:18px;font-size:17px;line-height:1.7;color:var(--ink-700);max-width:34em;}
.hero-sup{margin-top:12px;font-size:15px;line-height:1.75;color:var(--ink-500);max-width:36em;}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px;}
.hero-figure{position:relative;margin:0;}
.hero-figure img{
  width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:var(--r-xl);
  box-shadow:var(--sh-md);border:1px solid var(--line);
}
.hero-badge{
  position:absolute;right:16px;bottom:-18px;display:inline-flex;align-items:center;gap:8px;
  background:#fff;border:1px solid var(--line);border-radius:var(--r-md);
  padding:12px 16px;font-size:13px;font-weight:600;color:var(--ink-700);box-shadow:var(--sh-md);
}
.hero-badge .dot{width:8px;height:8px;border-radius:50%;background:var(--accent-600);flex:0 0 8px;}

/* ---------- Filter chips ---------- */
.filter-bar{
  display:flex;gap:10px;overflow-x:auto;padding:6px 2px;margin-top:8px;
  scrollbar-width:none;
}
.filter-bar::-webkit-scrollbar{display:none;}
.filter-chip{
  display:inline-flex;align-items:center;height:32px;padding:0 14px;border-radius:var(--r-pill);
  background:#fff;border:1px solid var(--line);color:var(--ink-700);font-size:13px;white-space:nowrap;
  transition:background .2s ease,border-color .2s ease,color .2s ease;
}
.filter-chip:hover{border-color:var(--brand-500);color:var(--brand-700);text-decoration:none;}
.filter-chip.is-active{background:var(--brand-100);border-color:transparent;color:var(--brand-700);font-weight:600;}
.filter-bar-wrap{margin-top:32px;}

/* ---------- Sections ---------- */
.section{padding:72px 0;}
.section-soft{background:var(--bg-soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.section-head{max-width:720px;margin-bottom:36px;}
.section-head h2{font-size:30px;line-height:1.35;}
.section-desc{margin-top:12px;font-size:16px;line-height:1.8;color:var(--ink-500);}

/* ---------- Numbered cards ---------- */
.num-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;}
.num-card{
  display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-lg);padding:28px 24px;box-shadow:var(--sh-sm);
  transition:transform .22s ease,box-shadow .22s ease,border-color .22s ease;
}
.num-card:hover{transform:translateY(-3px);box-shadow:var(--sh-md);border-color:var(--line-strong);}
.num-index{
  width:40px;height:40px;border-radius:10px;background:var(--brand-100);color:var(--brand-700);
  display:grid;place-items:center;font-size:15px;font-weight:700;font-variant-numeric:tabular-nums;
  margin-bottom:18px;
}
.num-card h3{font-size:20px;line-height:1.4;margin-bottom:10px;}
.num-card p{font-size:15px;line-height:1.75;color:var(--ink-500);margin-bottom:18px;}
.num-card .link-arrow{margin-top:auto;}

/* ---------- Compare table ---------- */
.table-wrap{
  overflow-x:auto;border:1px solid var(--line);border-radius:var(--r-lg);
  background:var(--surface);box-shadow:var(--sh-sm);
}
.compare-table{width:100%;border-collapse:collapse;min-width:560px;}
.compare-table caption{
  caption-side:top;text-align:left;padding:20px 24px 0;font-size:13px;line-height:1.6;color:var(--ink-500);
}
.compare-table th,.compare-table td{padding:18px 24px;text-align:left;border-bottom:1px solid var(--line);font-size:15px;color:var(--ink-700);}
.compare-table thead th{background:var(--bg-soft);font-size:14px;font-weight:600;color:var(--ink-700);}
.compare-table tbody th{font-weight:600;color:var(--ink-900);}
.compare-table tbody td:last-child{font-variant-numeric:tabular-nums;font-weight:600;color:var(--ink-900);}
.compare-table tbody tr:last-child th,.compare-table tbody tr:last-child td{border-bottom:0;}
.compare-table tbody tr:hover td{background:#FAFCFD;}
.table-note{margin-top:14px;font-size:13px;color:var(--ink-500);}

/* ---------- Split ---------- */
.split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:52px;align-items:center;}
.split-figure{margin:0;}
.split-figure img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:var(--r-xl);box-shadow:var(--sh-md);border:1px solid var(--line);}
.split h2{font-size:28px;line-height:1.35;}
.split .lead{margin-top:14px;font-size:16px;line-height:1.8;color:var(--ink-500);}
.info-list{list-style:none;padding:0;margin:24px 0 0;display:grid;gap:14px;}
.info-list li{display:flex;gap:12px;font-size:15px;line-height:1.75;color:var(--ink-700);}
.info-list li::before{content:"";flex:0 0 8px;width:8px;height:8px;border-radius:50%;background:var(--brand-500);margin-top:10px;}

/* ---------- FAQ ---------- */
.faq-layout{display:grid;grid-template-columns:minmax(0,4fr) minmax(0,8fr);gap:48px;align-items:start;}
.faq-layout h2{font-size:28px;line-height:1.35;}
.faq-layout .section-desc{margin-top:12px;}
.faq{display:grid;gap:12px;}
.faq-item{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);overflow:hidden;transition:box-shadow .2s ease;}
.faq-item:hover{box-shadow:var(--sh-sm);}
.faq-toggle{
  position:relative;width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px 20px;background:transparent;border:0;text-align:left;font-size:16px;font-weight:600;
  color:var(--ink-900);cursor:pointer;line-height:1.55;
}
.faq-toggle::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:3px;height:0;background:var(--brand-600);border-radius:2px;transition:height .2s ease;
}
.faq-toggle[aria-expanded="true"]{color:var(--brand-700);}
.faq-toggle[aria-expanded="true"]::before{height:20px;}
.faq-toggle:hover{color:var(--brand-700);}
.faq-icon{position:relative;width:16px;height:16px;flex:0 0 16px;}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;background:var(--brand-600);border-radius:1px;transition:transform .2s ease,opacity .2s ease;}
.faq-icon::before{left:0;top:7px;width:16px;height:2px;}
.faq-icon::after{left:7px;top:0;width:2px;height:16px;}
.faq-toggle[aria-expanded="true"] .faq-icon::after{transform:scaleY(0);opacity:0;}
.faq-a{padding:0 20px 20px;font-size:15px;line-height:1.8;color:var(--ink-500);}

/* ---------- Read cards ---------- */
.read-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;}
.read-card{
  display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--sh-sm);color:inherit;
  transition:transform .22s ease,box-shadow .22s ease;
}
.read-card:hover{text-decoration:none;transform:translateY(-3px);box-shadow:var(--sh-md);}
.read-thumb{overflow:hidden;background:var(--bg-soft);}
.read-thumb img{width:100%;aspect-ratio:16/9;object-fit:cover;transition:transform .3s ease;}
.read-card:hover .read-thumb img{transform:scale(1.03);}
.read-body{padding:20px;display:flex;flex-direction:column;gap:10px;}
.chip{
  display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:var(--r-pill);
  background:var(--brand-100);color:var(--brand-700);font-size:12px;font-weight:600;width:fit-content;
}
.read-body h3{font-size:18px;line-height:1.5;color:var(--ink-900);}
.read-body p{font-size:14px;line-height:1.7;color:var(--ink-500);}

/* ---------- CTA ---------- */
.cta-band{
  display:grid;grid-template-columns:minmax(0,1fr) auto;gap:36px;align-items:center;
  background:var(--bg-soft);border-radius:var(--r-xl);padding:56px 48px;border:1px solid var(--line);
}
.cta-band h2{font-size:28px;line-height:1.35;}
.cta-band p{margin-top:14px;font-size:16px;line-height:1.8;color:var(--ink-700);max-width:620px;}
.cta-note{display:block;margin-top:12px;font-size:12px;color:var(--ink-500);}
.cta-actions{display:flex;gap:12px;flex-wrap:wrap;}

/* ---------- Footer ---------- */
.site-footer{background:var(--brand-900);color:rgba(255,255,255,.72);padding:64px 0 0;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:48px;}
.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;font-size:17px;margin-bottom:14px;letter-spacing:-.2px;}
.footer-brand .brand-mark{background:rgba(255,255,255,.14);}
.footer-desc{font-size:14px;line-height:1.75;color:rgba(255,255,255,.66);max-width:300px;}
.footer-quick{display:flex;gap:16px;margin-top:16px;flex-wrap:wrap;}
.footer-quick a{font-size:13px;color:rgba(255,255,255,.72);}
.footer-quick a:hover{color:#fff;text-decoration:none;}
.footer-col h4{color:#fff;font-size:15px;margin:0 0 16px;letter-spacing:0;}
.footer-links{list-style:none;padding:0;margin:0;display:grid;gap:10px;}
.footer-links a{font-size:14px;color:rgba(255,255,255,.72);}
.footer-links a:hover{color:#fff;text-decoration:none;}
.footer-contact p{font-size:13px;line-height:1.8;color:rgba(255,255,255,.66);margin:0;}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.12);padding:20px 0;
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:rgba(255,255,255,.55);
}

/* ---------- Responsive ---------- */
@media (max-width:1199.98px){
  .hero-grid{gap:36px;}
  .split{gap:36px;}
  .faq-layout{gap:36px;}
}
@media (max-width:991.98px){
  .header-inner{flex-wrap:wrap;padding-top:10px;padding-bottom:10px;row-gap:10px;min-height:auto;}
  .brand{order:1;}
  .header-actions{order:2;margin-left:auto;}
  .seg-nav{
    order:3;width:100%;margin:0;overflow-x:auto;scrollbar-width:none;
    -webkit-mask-image:linear-gradient(to right,#000 0,#000 calc(100% - 28px),transparent 100%);
    mask-image:linear-gradient(to right,#000 0,#000 calc(100% - 28px),transparent 100%);
  }
  .seg-nav::-webkit-scrollbar{display:none;}
  .hero-grid{grid-template-columns:1fr;gap:36px;}
  .hero-figure{order:2;max-width:560px;}
  .hero-badge{right:12px;bottom:-16px;}
  .num-grid{grid-template-columns:1fr;}
  .split{grid-template-columns:1fr;gap:32px;}
  .split-figure{order:2;}
  .faq-layout{grid-template-columns:1fr;gap:28px;}
  .cta-band{grid-template-columns:1fr;padding:40px 28px;gap:28px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .section{padding:56px 0;}
  .page-hero{padding:28px 0 48px;}
}
@media (max-width:767.98px){
  .hero-copy h1{font-size:28px;}
  .hero-sub{font-size:16px;}
  .section-head h2,.split h2,.faq-layout h2,.cta-band h2{font-size:24px;}
  .read-grid{grid-template-columns:1fr;}
  .hero-actions .btn-brand,.hero-actions .btn-ghost{flex:1 1 auto;}
  .page-hero{padding:22px 0 44px;}
}
@media (max-width:575.98px){
  .container{padding:0 20px;}
  .footer-grid{grid-template-columns:1fr;}
  .cta-actions{width:100%;}
  .cta-actions .btn-brand,.cta-actions .btn-ghost{width:100%;}
  .section{padding:44px 0;}
  .num-card{padding:24px 20px;}
  .hero-badge{position:static;margin-top:14px;justify-content:flex-start;}
  .header-actions .btn-ghost{display:none;}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{transition:none !important;animation:none !important;}
  html{scroll-behavior:auto;}
}

/* roulang page: category3 */
:root{
  --brand-900:#123A52;--brand-700:#1D5474;--brand-600:#2A6A93;--brand-500:#3B85B0;--brand-100:#E7F0F6;
  --accent-600:#2C8B7F;--accent-100:#E4F3F0;--warm-500:#E07A3F;
  --bg-page:#F5F7F9;--bg-soft:#EDF2F6;--surface:#FFFFFF;
  --ink-900:#14212B;--ink-700:#334753;--ink-500:#6B7C88;--ink-300:#9DAAB3;
  --line:#E2E8ED;--line-strong:#CBD6DE;
  --r-sm:8px;--r-md:12px;--r-lg:16px;--r-xl:24px;--r-pill:999px;
  --sh-sm:0 1px 2px rgba(20,33,43,.05);
  --sh-md:0 8px 24px -12px rgba(29,84,116,.20);
  --sh-lg:0 24px 48px -24px rgba(29,84,116,.28);
  --sec:88px;
}
[data-bs-theme=light]{
  --bs-primary:#2A6A93;--bs-body-color:#334753;--bs-body-bg:#F5F7F9;
  --bs-border-color:#E2E8ED;--bs-border-radius:12px;
  --bs-link-color:#2A6A93;--bs-link-hover-color:#1D5474;
  --bs-font-sans-serif:-apple-system,"PingFang SC","Noto Sans SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;font-family:-apple-system,"PingFang SC","Noto Sans SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  font-size:16px;line-height:1.75;color:var(--ink-700);background:var(--bg-page);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--brand-600);text-decoration:none;transition:color .18s ease}
a:hover{color:var(--brand-700);text-decoration:underline;text-underline-offset:3px}
h1,h2,h3,h4,h5{color:var(--ink-900);font-weight:700;letter-spacing:-.2px;margin:0}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
button{font-family:inherit}
:focus-visible{outline:2px solid var(--brand-600);outline-offset:2px;border-radius:4px}

.container{width:100%;max-width:1200px;margin-inline:auto;padding-inline:24px}
@media (min-width:1600px){.container{max-width:1280px}}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:1030;background:#fff;
  border-bottom:1px solid var(--line);transition:box-shadow .22s ease,background .22s ease;
}
.site-header.is-scrolled{box-shadow:var(--sh-sm);background:rgba(255,255,255,.96)}
.header-inner{display:flex;align-items:center;gap:22px;height:72px}
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--ink-900);text-decoration:none;flex:0 0 auto}
.brand:hover{color:var(--brand-700);text-decoration:none}
.brand-mark{
  width:24px;height:24px;border-radius:7px;flex:0 0 auto;
  background:linear-gradient(160deg,var(--brand-500),var(--brand-700));
  display:inline-flex;align-items:center;justify-content:center;
}
.brand-mark svg{width:18px;height:18px;display:block}
.brand-text{font-size:17px;font-weight:700;letter-spacing:-.3px;white-space:nowrap}
.seg-nav{
  display:flex;align-items:center;gap:2px;background:var(--bg-soft);
  padding:4px;border-radius:var(--r-pill);margin-inline:auto;
}
.seg-chip{
  display:inline-flex;align-items:center;height:36px;padding:0 16px;border-radius:var(--r-pill);
  font-size:14px;color:var(--ink-700);white-space:nowrap;text-decoration:none;
  transition:background .18s ease,color .18s ease,box-shadow .18s ease;
}
.seg-chip:hover{background:var(--brand-100);color:var(--brand-700);text-decoration:none}
.seg-chip.is-active{background:#fff;color:var(--brand-700);box-shadow:var(--sh-sm);font-weight:600}
.header-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto}

/* ---------- buttons ---------- */
.btn-brand,.btn-ghost,.btn-text{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border-radius:var(--r-md);font-weight:600;font-size:15px;line-height:1;
  border:1px solid transparent;cursor:pointer;text-decoration:none;
  transition:background .2s ease,color .2s ease,border-color .2s ease,transform .2s ease,box-shadow .2s ease;
}
.btn-brand{background:var(--brand-600);color:#fff;height:44px;padding:0 22px}
.btn-brand:hover{background:var(--brand-700);color:#fff;transform:translateY(-1px);box-shadow:var(--sh-md);text-decoration:none}
.btn-brand:active{transform:none;box-shadow:none}
.btn-ghost{background:#fff;border-color:var(--line-strong);color:var(--ink-700);height:44px;padding:0 20px}
.btn-ghost:hover{border-color:var(--brand-500);color:var(--brand-700);transform:translateY(-1px);text-decoration:none}
.btn-ghost:active{transform:none}
.btn-text{
  background:transparent;color:var(--brand-600);height:auto;padding:0;font-size:15px;
  border:none;gap:6px;
}
.btn-text .arrow{transition:transform .2s ease}
.btn-text:hover{color:var(--brand-700);text-decoration:none}
.btn-text:hover .arrow{transform:translateX(3px)}
.btn-sm{height:40px;padding:0 18px;font-size:14px}

/* ---------- crumbs ---------- */
.crumbs{padding:26px 0 0;font-size:14px;color:var(--ink-500)}
.crumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.crumbs .sep{color:var(--ink-300)}
.crumbs a{color:var(--ink-500)}
.crumbs a:hover{color:var(--brand-700)}
.crumbs .current{color:var(--ink-500)}

/* ---------- hero ---------- */
.cat-hero{padding:28px 0 0}
.hero-panel{
  position:relative;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-xl);box-shadow:var(--sh-md);overflow:hidden;
}
.hero-panel::after{
  content:"";position:absolute;right:-120px;top:-140px;width:420px;height:420px;border-radius:50%;
  background:radial-gradient(circle,rgba(59,133,176,.10),rgba(59,133,176,0) 68%);
  pointer-events:none;
}
.hero-grid{display:grid;grid-template-columns:5fr 7fr;gap:0;align-items:stretch}
.hero-copy{padding:52px 48px 52px 48px;position:relative;z-index:1}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;background:var(--brand-100);color:var(--brand-700);
  font-size:13px;font-weight:600;padding:5px 12px;border-radius:var(--r-pill);margin-bottom:18px;
}
.hero-copy h1{font-size:40px;line-height:1.25;max-width:18ch}
.hero-lead{margin-top:18px;font-size:16px;line-height:1.8;color:var(--ink-700);max-width:34em}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.hero-facts{
  display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:34px;
  padding-top:22px;border-top:1px solid var(--line);
}
.fact-label{font-size:13px;color:var(--ink-500);line-height:1.5}
.fact-value{font-size:15px;font-weight:600;color:var(--ink-900);font-variant-numeric:tabular-nums}
.hero-figure{position:relative;min-height:100%;background:var(--bg-soft)}
.hero-figure img{width:100%;height:100%;object-fit:cover;aspect-ratio:4/3}
.hero-badge{
  position:absolute;left:24px;bottom:24px;background:#fff;border:1px solid var(--line);
  border-radius:var(--r-md);box-shadow:var(--sh-md);padding:14px 18px;max-width:270px;
}
.hero-badge strong{display:block;font-size:15px;color:var(--ink-900);font-weight:700}
.hero-badge span{display:block;font-size:13px;color:var(--ink-500);margin-top:4px;line-height:1.6}

/* ---------- filter row ---------- */
.filter-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}
.filter-chip{
  display:inline-flex;align-items:center;height:32px;padding:0 14px;border-radius:var(--r-pill);
  font-size:13px;font-weight:500;color:var(--ink-700);background:var(--surface);
  border:1px solid var(--line);text-decoration:none;transition:all .18s ease;
}
.filter-chip:hover{border-color:var(--brand-500);color:var(--brand-700);text-decoration:none}
.filter-chip.is-active{background:var(--brand-700);border-color:var(--brand-700);color:#fff}

/* ---------- sections ---------- */
.section{padding-top:var(--sec)}
.section-head{max-width:760px;margin-bottom:36px}
.section-head h2{font-size:30px;line-height:1.35}
.section-head p{margin-top:12px;font-size:16px;color:var(--ink-500);line-height:1.8}
.section-head .kicker{
  display:block;font-size:13px;font-weight:600;color:var(--brand-600);
  letter-spacing:.04em;margin-bottom:10px;
}

/* ---------- step flow ---------- */
.step-list{position:relative;display:grid;gap:18px;padding-left:44px}
.step-list::before{
  content:"";position:absolute;left:15px;top:18px;bottom:18px;width:2px;
  background:linear-gradient(180deg,var(--brand-500) 0%,var(--brand-100) 100%);
  border-radius:2px;
}
.step-item{
  position:relative;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-md);padding:22px 26px;box-shadow:var(--sh-sm);
  transition:box-shadow .22s ease,transform .22s ease,border-color .22s ease;
}
.step-item:hover{box-shadow:var(--sh-md);transform:translateY(-2px);border-color:var(--line-strong)}
.step-item::before{
  content:"";position:absolute;left:-35px;top:28px;width:12px;height:12px;border-radius:50%;
  background:var(--brand-600);box-shadow:0 0 0 4px var(--brand-100);
}
.step-item.is-key::before{box-shadow:0 0 0 5px rgba(59,133,176,.28)}
.step-no{display:block;font-size:13px;font-weight:700;color:var(--brand-600);letter-spacing:.08em;margin-bottom:6px}
.step-item h3{font-size:20px;line-height:1.4}
.step-item p{margin-top:8px;font-size:15px;line-height:1.8;color:var(--ink-700)}
.step-tip{
  margin-top:14px;background:var(--bg-soft);border-radius:var(--r-sm);
  padding:12px 16px;font-size:14px;line-height:1.75;color:var(--ink-500);
}
.step-tip b{color:var(--brand-700);font-weight:600}

/* ---------- split block ---------- */
.split-block{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.split-copy h2{font-size:30px;line-height:1.35;margin-bottom:16px}
.split-copy p{font-size:16px;line-height:1.85;color:var(--ink-700)}
.split-copy p + p{margin-top:14px}
.split-figure{
  border-radius:var(--r-lg);overflow:hidden;border:1px solid var(--line);
  box-shadow:var(--sh-md);background:var(--bg-soft);
}
.split-figure img{width:100%;aspect-ratio:4/3;object-fit:cover}
.check-list{margin-top:22px;display:grid;gap:12px}
.check-list li{display:flex;gap:12px;font-size:15px;line-height:1.7;color:var(--ink-700)}
.check-list .dot{
  flex:0 0 auto;width:18px;height:18px;border-radius:50%;background:var(--brand-100);
  color:var(--brand-700);font-size:11px;font-weight:700;display:inline-flex;
  align-items:center;justify-content:center;margin-top:4px;
}

/* ---------- note cards ---------- */
.note-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.note-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:26px 24px;border-left:3px solid var(--brand-500);box-shadow:var(--sh-sm);
  transition:box-shadow .22s ease,transform .22s ease;
}
.note-card:hover{box-shadow:var(--sh-md);transform:translateY(-2px)}
.note-card h3{font-size:18px;line-height:1.45;margin-bottom:10px}
.note-card p{font-size:14px;line-height:1.8;color:var(--ink-500)}
.note-tag{
  display:inline-block;background:var(--accent-100);color:var(--accent-600);
  font-size:12px;font-weight:600;padding:3px 10px;border-radius:var(--r-pill);margin-bottom:12px;
}

/* ---------- faq ---------- */
.faq-layout{display:grid;grid-template-columns:4fr 8fr;gap:48px;align-items:start}
.faq-side h2{font-size:30px;line-height:1.35}
.faq-side p{margin-top:12px;font-size:15px;line-height:1.8;color:var(--ink-500)}
.faq{display:grid;gap:12px}
.faq-item{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);overflow:hidden}
.faq-item summary{
  list-style:none;cursor:pointer;padding:18px 22px;font-size:16px;font-weight:600;color:var(--ink-900);
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  transition:color .18s ease,background .18s ease;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary:hover{color:var(--brand-700);background:#FBFCFD}
.faq-item summary .sign{
  position:relative;flex:0 0 auto;width:16px;height:16px;
}
.faq-item summary .sign::before,
.faq-item summary .sign::after{
  content:"";position:absolute;left:50%;top:50%;background:var(--brand-600);border-radius:2px;
  transform:translate(-50%,-50%);transition:transform .2s ease,opacity .2s ease;
}
.faq-item summary .sign::before{width:14px;height:2px}
.faq-item summary .sign::after{width:2px;height:14px}
.faq-item[open] summary{color:var(--brand-700)}
.faq-item[open] summary .sign::after{transform:translate(-50%,-50%) scaleY(0);opacity:0}
.faq-body{padding:0 22px 20px;font-size:15px;line-height:1.85;color:var(--ink-500)}
.faq-item[open] .faq-body{border-left:3px solid var(--brand-500);margin-left:19px;padding-left:16px}

/* ---------- cta band ---------- */
.cta-band{
  margin-top:var(--sec);background:var(--bg-soft);border:1px solid var(--line);
  border-radius:var(--r-xl);padding:56px 48px;display:flex;flex-wrap:wrap;
  align-items:center;justify-content:space-between;gap:32px;
}
.cta-band h2{font-size:28px;line-height:1.35;max-width:22ch}
.cta-band p{margin-top:12px;font-size:15px;line-height:1.8;color:var(--ink-500);max-width:40em}
.cta-note{margin-top:14px;font-size:12px;color:var(--ink-300)}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px}

/* ---------- read more ---------- */
.read-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.read-card{
  display:block;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-lg);overflow:hidden;text-decoration:none;box-shadow:var(--sh-sm);
  transition:box-shadow .22s ease,transform .22s ease,border-color .22s ease;
}
.read-card:hover{box-shadow:var(--sh-md);transform:translateY(-2px);border-color:var(--line-strong);text-decoration:none}
.read-card .thumb{overflow:hidden;background:var(--bg-soft)}
.read-card .thumb img{width:100%;aspect-ratio:16/9;object-fit:cover;transition:transform .24s ease}
.read-card:hover .thumb img{transform:scale(1.03)}
.read-body{padding:20px 22px 24px}
.read-body .chip{
  display:inline-block;background:var(--brand-100);color:var(--brand-700);font-size:12px;
  font-weight:600;padding:3px 10px;border-radius:var(--r-pill);margin-bottom:10px;
}
.read-body h3{font-size:17px;line-height:1.5;color:var(--ink-900);margin-bottom:8px}
.read-body p{font-size:14px;line-height:1.75;color:var(--ink-500)}

/* ---------- footer ---------- */
.site-footer{margin-top:var(--sec);background:var(--brand-900);color:rgba(255,255,255,.75);padding:64px 0 0}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.3fr;gap:40px;padding-bottom:44px;border-bottom:1px solid rgba(255,255,255,.12)}
.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-size:17px;font-weight:700;margin-bottom:14px}
.footer-brand .brand-mark{background:rgba(255,255,255,.16)}
.footer-desc{font-size:14px;line-height:1.8;color:rgba(255,255,255,.7);max-width:26em}
.footer-quick{display:flex;flex-wrap:wrap;gap:16px;margin-top:16px}
.footer-quick a{font-size:14px;color:rgba(255,255,255,.72)}
.footer-quick a:hover{color:#fff;text-decoration:none}
.footer-col h4{font-size:15px;color:#fff;font-weight:700;margin-bottom:14px}
.footer-links{display:grid;gap:10px}
.footer-links a{font-size:14px;color:rgba(255,255,255,.72)}
.footer-links a:hover{color:#fff;text-decoration:none}
.footer-contact p{font-size:14px;line-height:1.8;color:rgba(255,255,255,.72)}
.footer-bottom{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;
  padding:22px 0 26px;font-size:13px;color:rgba(255,255,255,.55);
}

/* ---------- responsive ---------- */
@media (max-width:1199px){
  :root{--sec:76px}
  .hero-copy{padding:40px 34px}
  .hero-copy h1{font-size:34px}
  .section-head h2,.split-copy h2,.faq-side h2{font-size:27px}
}
@media (max-width:991px){
  :root{--sec:64px}
  .header-inner{flex-wrap:wrap;height:auto;padding-top:12px;padding-bottom:12px;row-gap:12px}
  .seg-nav{
    order:3;width:100%;margin:0;overflow-x:auto;flex-wrap:nowrap;
    -webkit-overflow-scrolling:touch;scrollbar-width:none;
    -webkit-mask-image:linear-gradient(90deg,#000 88%,transparent 100%);
    mask-image:linear-gradient(90deg,#000 88%,transparent 100%);
  }
  .seg-nav::-webkit-scrollbar{display:none}
  .header-actions{margin-left:auto}
  .hero-grid{grid-template-columns:1fr}
  .hero-copy{padding:34px 26px 30px}
  .hero-figure img{aspect-ratio:16/9}
  .hero-badge{position:static;margin:0 26px 26px;max-width:none}
  .split-block{grid-template-columns:1fr;gap:28px}
  .split-figure{order:-1}
  .note-grid{grid-template-columns:1fr 1fr}
  .faq-layout{grid-template-columns:1fr;gap:26px}
  .read-grid{grid-template-columns:1fr 1fr}
  .cta-band{padding:40px 30px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
}
@media (max-width:767px){
  :root{--sec:52px}
  .container{padding-inline:20px}
  .hero-copy h1{font-size:28px;max-width:none}
  .section-head h2,.split-copy h2,.faq-side h2{font-size:23px}
  .cta-band h2{font-size:22px}
  .note-grid{grid-template-columns:1fr}
  .read-grid{grid-template-columns:1fr}
  .hero-facts{grid-template-columns:1fr;gap:12px}
  .step-list{padding-left:34px}
  .step-list::before{left:11px}
  .step-item::before{left:-29px;top:26px;width:10px;height:10px}
  .step-item{padding:18px 20px}
  .cta-band{padding:32px 22px;border-radius:var(--r-lg)}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;gap:8px}
}
@media (max-width:575px){
  .header-actions .btn-ghost{display:none}
  .brand-text{font-size:15px}
  .hero-cta .btn-brand,.hero-cta .btn-ghost{width:100%}
  .cta-actions{width:100%}
  .cta-actions .btn-brand,.cta-actions .btn-ghost{width:100%}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important}
  .btn-brand:hover,.btn-ghost:hover,.step-item:hover,.note-card:hover,.read-card:hover{transform:none}
}

/* roulang page: category4 */
:root{
  --brand-900:#123A52;--brand-700:#1D5474;--brand-600:#2A6A93;--brand-500:#3B85B0;--brand-100:#E7F0F6;
  --accent-600:#2C8B7F;--accent-100:#E4F3F0;--warm-500:#E07A3F;
  --bg-page:#F5F7F9;--bg-soft:#EDF2F6;--surface:#FFFFFF;
  --ink-900:#14212B;--ink-700:#334753;--ink-500:#6B7C88;--ink-300:#9DAAB3;
  --line:#E2E8ED;--line-strong:#CBD6DE;
  --r-sm:8px;--r-md:12px;--r-lg:16px;--r-xl:24px;--r-pill:999px;
  --sh-sm:0 1px 2px rgba(20,33,43,.05);
  --sh-md:0 8px 24px -12px rgba(29,84,116,.20);
  --sh-lg:0 24px 48px -24px rgba(29,84,116,.28);
  --sec:88px;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;font-family:-apple-system,"PingFang SC","Noto Sans SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  font-size:16px;line-height:1.75;color:var(--ink-700);background:var(--bg-page);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{margin:0;color:var(--ink-900);font-weight:700;letter-spacing:-0.2px;}
p{margin:0;}
a{color:var(--brand-600);text-decoration:none;transition:color .22s ease;}
a:hover{color:var(--brand-700);}
img{display:block;max-width:100%;}
ul{margin:0;padding:0;list-style:none;}
button{font-family:inherit;}
:focus-visible{outline:2px solid var(--brand-600);outline-offset:2px;border-radius:4px;}
::selection{background:var(--brand-100);color:var(--brand-900);}

body .container{max-width:1200px;padding-left:24px;padding-right:24px;margin-left:auto;margin-right:auto;}
@media (min-width:1600px){body .container{max-width:1280px;}}

/* ---------- 按钮 ---------- */
.btn-brand,.btn-ghost{
  display:inline-flex;align-items:center;justify-content:center;height:44px;padding:0 22px;
  border-radius:var(--r-md);font-size:15px;font-weight:600;border:1px solid transparent;cursor:pointer;
  transition:background .22s ease,color .22s ease,border-color .22s ease,transform .22s ease,box-shadow .22s ease;
}
.btn-brand{background:var(--brand-600);color:#fff;}
.btn-brand:hover{background:var(--brand-700);color:#fff;transform:translateY(-1px);box-shadow:var(--sh-md);}
.btn-brand:active{transform:none;}
.btn-ghost{background:#fff;border-color:var(--line-strong);color:var(--ink-700);}
.btn-ghost:hover{border-color:var(--brand-500);color:var(--brand-700);transform:translateY(-1px);box-shadow:var(--sh-sm);}
.btn-ghost:active{transform:none;}
.btn-sm{height:38px;padding:0 16px;font-size:14px;}
.btn-text{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--brand-600);}
.btn-text .arrow{display:inline-block;transition:transform .22s ease;}
.btn-text:hover .arrow{transform:translateX(3px);}

/* ---------- 标签 ---------- */
.chip{display:inline-flex;align-items:center;height:26px;padding:0 10px;border-radius:var(--r-pill);
  background:var(--brand-100);color:var(--brand-700);font-size:13px;font-weight:500;line-height:1.2;}
.chip-soft{background:var(--accent-100);color:var(--accent-600);}
.chip-warm{background:var(--warm-500);color:#fff;font-size:12px;}
.eyebrow{display:inline-block;font-size:13px;font-weight:600;color:var(--brand-600);margin-bottom:12px;}

/* ---------- 头部 ---------- */
.site-header{position:sticky;top:0;z-index:1030;background:#fff;border-bottom:1px solid var(--line);
  transition:box-shadow .22s ease,background .22s ease;}
.site-header.is-scrolled{box-shadow:var(--sh-sm);background:rgba(255,255,255,.96);}
.header-inner{display:flex;align-items:center;gap:20px;min-height:72px;flex-wrap:nowrap;}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink-900);
  font-size:18px;font-weight:700;white-space:nowrap;letter-spacing:-0.2px;}
.brand:hover{color:var(--ink-900);}
.brand-mark{width:30px;height:30px;border-radius:10px;background:var(--brand-600);display:inline-flex;
  align-items:center;justify-content:center;flex:0 0 30px;box-shadow:var(--sh-sm);}
.brand-mark svg{width:20px;height:20px;}
.brand-text{line-height:1.2;}
.seg-nav{display:flex;align-items:center;gap:4px;background:var(--bg-soft);padding:4px;border-radius:var(--r-pill);
  margin:0 auto;max-width:100%;}
.seg-chip{display:inline-flex;align-items:center;justify-content:center;height:36px;padding:0 16px;
  border-radius:var(--r-pill);font-size:14px;font-weight:500;color:var(--ink-700);white-space:nowrap;
  transition:background .22s ease,color .22s ease,box-shadow .22s ease;}
.seg-chip:hover{background:var(--brand-100);color:var(--brand-700);}
.seg-chip.is-active{background:#fff;color:var(--brand-700);font-weight:600;box-shadow:var(--sh-sm);}
.header-actions{display:flex;align-items:center;gap:10px;margin-left:auto;}

/* ---------- 面包屑 ---------- */
.crumbs{display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding:24px 0 0;font-size:14px;color:var(--ink-500);}
.crumbs a{color:var(--ink-500);}
.crumbs a:hover{color:var(--brand-700);}
.crumbs .sep{color:var(--ink-300);}
.crumbs .current{color:var(--ink-500);}

/* ---------- Hero ---------- */
.page-hero{padding-bottom:var(--sec);}
.hero-grid{display:grid;grid-template-columns:5fr 7fr;gap:48px;align-items:center;margin-top:28px;}
.hero-title{font-size:40px;line-height:1.25;max-width:18ch;}
.hero-sub{margin-top:18px;font-size:17px;line-height:1.8;color:var(--ink-700);max-width:520px;}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px;}
.hero-stats{display:flex;gap:36px;flex-wrap:wrap;margin-top:36px;padding-top:26px;border-top:1px solid var(--line);}
.stat-num{font-size:24px;font-weight:700;line-height:1.3;color:var(--brand-700);font-variant-numeric:tabular-nums;}
.stat-label{font-size:13px;color:var(--ink-500);margin-top:2px;}
.hero-media{border-radius:var(--r-xl);overflow:hidden;background:var(--bg-soft);box-shadow:var(--sh-md);aspect-ratio:4/3;}
.hero-media img{width:100%;height:100%;object-fit:cover;}

/* ---------- 筛选 chip ---------- */
.filter-wrap{padding-bottom:36px;}
.filter-row{display:flex;gap:10px;overflow-x:auto;padding:4px 0 6px;scrollbar-width:none;}
.filter-row::-webkit-scrollbar{display:none;}
.filter-chip{display:inline-flex;align-items:center;height:32px;padding:0 14px;border-radius:var(--r-pill);
  font-size:13px;font-weight:500;white-space:nowrap;background:#fff;border:1px solid var(--line);color:var(--ink-700);
  transition:background .22s ease,color .22s ease,border-color .22s ease;}
.filter-chip:hover{background:var(--brand-100);color:var(--brand-700);border-color:var(--brand-100);}
.filter-chip.is-active{background:var(--brand-700);border-color:var(--brand-700);color:#fff;}

/* ---------- 通用板块 ---------- */
.section{padding-bottom:var(--sec);}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:32px;flex-wrap:wrap;}
.section-title{font-size:30px;line-height:1.35;}
.section-note{font-size:14px;line-height:1.7;color:var(--ink-500);max-width:420px;}

/* ---------- 杂志式大图卡 ---------- */
.feature-banner{position:relative;border-radius:var(--r-xl);overflow:hidden;box-shadow:var(--sh-md);background:var(--brand-900);}
.feature-banner img{width:100%;aspect-ratio:2/1;object-fit:cover;}
.feature-banner::after{content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(18,58,82,0) 45%,rgba(18,58,82,.30) 100%);}
.banner-card{position:absolute;left:28px;bottom:28px;max-width:440px;background:#fff;border-radius:var(--r-lg);
  padding:24px;box-shadow:var(--sh-lg);z-index:2;}
.banner-card h2{font-size:24px;line-height:1.4;margin:12px 0 10px;}
.banner-card p{font-size:15px;line-height:1.75;color:var(--ink-500);margin-bottom:16px;}

.mini-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-top:24px;}
.mini-card{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:24px;
  transition:box-shadow .22s ease,transform .22s ease,border-color .22s ease;}
.mini-card:hover{box-shadow:var(--sh-md);transform:translateY(-2px);border-color:var(--line-strong);}
.mini-card.alt{background:var(--bg-soft);border-color:transparent;}
.mini-card.alt:hover{background:#fff;border-color:var(--line);}
.mini-card h3{font-size:20px;line-height:1.45;margin:12px 0 10px;}
.mini-card p{font-size:15px;line-height:1.75;color:var(--ink-500);}
.mini-meta{margin-top:16px;padding-top:12px;border-top:1px dashed var(--line-strong);font-size:13px;color:var(--ink-300);}

/* ---------- 步骤流 ---------- */
.steps{position:relative;padding-left:34px;margin-top:8px;}
.steps::before{content:"";position:absolute;left:9px;top:14px;bottom:14px;width:2px;background:var(--line-strong);}
.step{position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--r-md);
  padding:22px 24px;box-shadow:var(--sh-sm);margin-bottom:20px;transition:box-shadow .22s ease;}
.step:last-child{margin-bottom:0;}
.step:hover{box-shadow:var(--sh-md);}
.step::before{content:"";position:absolute;left:-32px;top:30px;width:12px;height:12px;border-radius:50%;
  background:var(--brand-600);box-shadow:0 0 0 4px var(--brand-100);}
.step h3{font-size:20px;line-height:1.45;margin-bottom:8px;}
.step p{font-size:15px;line-height:1.8;color:var(--ink-500);}
.tip{margin-top:14px;background:var(--brand-100);border-radius:var(--r-sm);padding:12px 14px;
  font-size:14px;line-height:1.7;color:var(--brand-900);}

/* ---------- 同步项清单 ---------- */
.scope-panel{background:#fff;border:1px solid var(--line);border-radius:var(--r-xl);padding:32px;box-shadow:var(--sh-sm);}
.scope-list{display:grid;grid-template-columns:repeat(2,1fr);gap:18px 32px;}
.scope-item{display:flex;gap:12px;padding-bottom:16px;border-bottom:1px solid var(--line);}
.scope-item:last-child,.scope-item:nth-last-child(2){border-bottom:0;padding-bottom:0;}
.scope-dot{flex:0 0 8px;width:8px;height:8px;border-radius:50%;background:var(--accent-600);margin-top:10px;}
.scope-item h4{font-size:16px;font-weight:600;margin-bottom:4px;}
.scope-item p{font-size:14px;line-height:1.7;color:var(--ink-500);}

/* ---------- FAQ ---------- */
.faq-grid{display:grid;grid-template-columns:4fr 8fr;gap:40px;align-items:start;}
.faq-intro h2{font-size:30px;line-height:1.35;margin-bottom:12px;}
.faq-intro p{font-size:15px;line-height:1.8;color:var(--ink-500);margin-bottom:20px;}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:var(--r-md);margin-bottom:12px;overflow:hidden;
  transition:box-shadow .22s ease,border-color .22s ease;}
.faq-item:hover{box-shadow:var(--sh-sm);}
.faq-item.is-open{border-color:var(--brand-500);box-shadow:var(--sh-sm);}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 20px;
  background:none;border:0;font-size:16px;font-weight:600;color:var(--ink-900);text-align:left;cursor:pointer;
  transition:color .22s ease;}
.faq-q:hover{color:var(--brand-700);}
.faq-q[aria-expanded="true"]{color:var(--brand-700);}
.faq-q .sign{position:relative;flex:0 0 14px;width:14px;height:14px;}
.faq-q .sign::before,.faq-q .sign::after{content:"";position:absolute;background:var(--brand-600);border-radius:2px;
  transition:transform .22s ease,opacity .22s ease;}
.faq-q .sign::before{left:0;top:6px;width:14px;height:2px;}
.faq-q .sign::after{left:6px;top:0;width:2px;height:14px;}
.faq-q[aria-expanded="true"] .sign::after{transform:scaleY(0);opacity:0;}
.faq-a{max-height:0;overflow:hidden;transition:max-height .24s ease;}
.faq-a-inner{padding:0 20px 20px;font-size:15px;line-height:1.8;color:var(--ink-500);border-left:3px solid var(--brand-100);
  margin-left:20px;padding-left:16px;}

/* ---------- CTA 条 ---------- */
.cta-band{background:var(--bg-soft);border-radius:var(--r-xl);padding:56px 48px;display:flex;
  align-items:center;justify-content:space-between;gap:40px;flex-wrap:wrap;}
.cta-band h2{font-size:28px;line-height:1.35;margin-bottom:10px;}
.cta-band p{font-size:15px;line-height:1.75;color:var(--ink-700);max-width:520px;}
.cta-note{font-size:12px;color:var(--ink-500);margin-top:12px;}
.cta-actions{display:flex;gap:12px;flex-wrap:wrap;}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--brand-900);color:rgba(255,255,255,.72);padding:64px 0 0;margin-top:0;
  border-top:1px solid rgba(255,255,255,.12);}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.3fr;gap:40px;padding-bottom:48px;}
.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-size:17px;font-weight:700;letter-spacing:-0.2px;}
.footer-brand .brand-mark{width:30px;height:30px;flex:0 0 30px;box-shadow:none;}
.footer-desc{margin-top:14px;font-size:14px;line-height:1.8;max-width:320px;}
.footer-quick{display:flex;gap:16px;flex-wrap:wrap;margin-top:18px;font-size:14px;}
.footer-quick a{color:rgba(255,255,255,.72);}
.footer-quick a:hover{color:#fff;text-decoration:underline;text-underline-offset:3px;}
.footer-col h4{color:#fff;font-size:15px;font-weight:600;margin-bottom:16px;letter-spacing:0;}
.footer-links li{margin-bottom:10px;font-size:14px;line-height:1.6;}
.footer-links a{color:rgba(255,255,255,.72);}
.footer-links a:hover{color:#fff;text-decoration:underline;text-underline-offset:3px;}
.footer-contact p{font-size:14px;line-height:1.8;}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding:20px 0 28px;display:flex;
  justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px;color:rgba(255,255,255,.6);}

/* ---------- 响应式 ---------- */
@media (max-width:1199.98px){
  .hero-grid{gap:36px;}
  .hero-title{font-size:34px;}
}
@media (max-width:1100px){
  .header-actions .btn-ghost{display:none;}
}
@media (max-width:991.98px){
  :root{--sec:64px;}
  .header-inner{flex-wrap:wrap;min-height:60px;padding-top:10px;padding-bottom:10px;gap:12px;}
  .seg-nav{order:3;width:100%;margin:0;overflow-x:auto;scrollbar-width:none;
    -webkit-overflow-scrolling:touch;
    -webkit-mask-image:linear-gradient(90deg,#000 0,#000 calc(100% - 24px),transparent 100%);
    mask-image:linear-gradient(90deg,#000 0,#000 calc(100% - 24px),transparent 100%);}
  .seg-nav::-webkit-scrollbar{display:none;}
  .header-actions{margin-left:auto;}
  .hero-grid{grid-template-columns:1fr;gap:32px;}
  .hero-title{font-size:32px;max-width:none;}
  .hero-media{aspect-ratio:16/9;}
  .faq-grid{grid-template-columns:1fr;gap:24px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .cta-band{padding:40px 32px;}
  .cta-band h2{font-size:24px;}
}
@media (max-width:767.98px){
  :root{--sec:48px;}
  body{font-size:15px;}
  body .container{padding-left:20px;padding-right:20px;}
  .brand{font-size:16px;}
  .hero-title{font-size:28px;}
  .hero-sub{font-size:16px;}
  .hero-stats{gap:24px;}
  .section-title{font-size:24px;}
  .section-head{margin-bottom:24px;}
  .feature-banner{border-radius:var(--r-lg);}
  .feature-banner img{aspect-ratio:16/10;}
  .feature-banner::after{background:linear-gradient(180deg,rgba(18,58,82,0) 60%,rgba(18,58,82,.22) 100%);}
  .banner-card{position:static;max-width:none;border-radius:0;box-shadow:none;padding:22px 20px;}
  .banner-card h2{font-size:21px;}
  .mini-grid{grid-template-columns:1fr;}
  .scope-panel{padding:24px 20px;}
  .scope-list{grid-template-columns:1fr;}
  .scope-item:nth-last-child(2){border-bottom:1px solid var(--line);padding-bottom:16px;}
  .steps{padding-left:28px;}
  .steps::before{left:6px;}
  .step{padding:20px 18px;}
  .step::before{left:-28px;top:26px;}
  .cta-band{padding:32px 20px;}
  .cta-actions{width:100%;}
  .cta-actions .btn-brand,.cta-actions .btn-ghost{flex:1 1 100%;}
  .footer-grid{grid-template-columns:1fr;gap:28px;padding-bottom:36px;}
  .site-footer{padding-top:48px;}
}
@media (max-width:575.98px){
  .hero-actions{flex-direction:column;}
  .hero-actions .btn-brand,.hero-actions .btn-ghost{width:100%;}
  .hero-title{font-size:26px;}
  .faq-q{font-size:15px;padding:16px;}
  .faq-a-inner{padding:0 16px 16px;margin-left:16px;}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{transition:none !important;animation:none !important;scroll-behavior:auto !important;}
  .mini-card:hover,.step:hover,.btn-brand:hover,.btn-ghost:hover{transform:none;}
}