/* roulang page: index */
:root{
  --brand-600:#1359D8;
  --brand-700:#0E45AC;
  --brand-100:#E4EDFC;
  --accent-500:#12B3A6;
  --accent-100:#E1F6F4;
  --amber-500:#F4A32B;
  --ink-900:#0C1B33;
  --ink-700:#2A3B55;
  --ink-500:#5C6B84;
  --line:#E2E8F2;
  --bg-page:#F5F8FC;
  --bg-card:#FFFFFF;
  --bg-tint:#EDF3FD;
  --shadow-1:0 1px 2px rgba(12,27,51,.05), 0 1px 1px rgba(12,27,51,.04);
  --shadow-2:0 10px 30px -14px rgba(12,27,51,.18);
  --shadow-hover:0 18px 40px -18px rgba(12,27,51,.28);
  --radius-card:16px;
  --radius-sm:12px;
  --radius-btn:10px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg-page);
  color:var(--ink-700);
  font-family:'PingFang SC','HarmonyOS Sans SC','Microsoft YaHei','Noto Sans SC',system-ui,sans-serif;
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{margin:0;color:var(--ink-900);font-weight:600;line-height:1.3}
p{margin:0}
img{max-width:100%;display:block;border-radius:14px}
a{color:var(--brand-600);text-decoration:none;transition:color .2s ease-out}
a:hover{color:var(--brand-700)}
button{font:inherit;cursor:pointer;border:0;background:none;color:inherit}
ul,ol{margin:0;padding:0;list-style:none}
dl,dd,dt{margin:0}
:focus-visible{outline:2px solid var(--brand-600);outline-offset:2px}
.container{width:100%;max-width:1200px;margin:0 auto;padding-left:20px;padding-right:20px}
@media (min-width:768px){.container{padding-left:32px;padding-right:32px}}
@media (min-width:1440px){.container{max-width:1280px}}
.section{padding-top:48px;padding-bottom:48px}
@media (min-width:768px){.section{padding-top:72px;padding-bottom:72px}}
@media (min-width:1024px){.section{padding-top:96px;padding-bottom:96px}}
.section-title{font-size:clamp(22px,2.6vw,32px);font-weight:600;letter-spacing:0}
.section-sub{margin-top:10px;color:var(--ink-500);font-size:15px;max-width:680px}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  padding:5px 12px;border-radius:999px;
  background:var(--brand-100);color:var(--brand-700);
  font-size:12px;font-weight:600;letter-spacing:.02em;
}
.eyebrow-accent{background:var(--accent-100);color:#0C7C72}
.hr-line{height:1px;background:var(--line);border:0;margin:0}

/* 导航 */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(255,255,255,.96);
  border-bottom:1px solid var(--line);
  transition:box-shadow .2s ease-out;
}
.site-header.is-stuck{box-shadow:var(--shadow-1)}
.nav-inner{
  height:56px;display:flex;align-items:center;justify-content:space-between;gap:16px;
}
@media (min-width:1024px){.nav-inner{height:64px}}
.nav-left{display:flex;align-items:center;gap:28px;min-width:0}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink-900);flex-shrink:0}
.brand:hover{color:var(--ink-900)}
.brand-mark{
  width:32px;height:32px;border-radius:8px;background:var(--brand-600);
  display:flex;align-items:center;justify-content:center;position:relative;flex-shrink:0;
}
.brand-mark::after{
  content:"";position:absolute;left:7px;right:7px;bottom:8px;height:2px;
  background:var(--accent-500);border-radius:2px;
}
.brand-text{font-size:16px;font-weight:600;white-space:nowrap;color:var(--ink-900)}
.nav-links{display:none;align-items:center;gap:4px}
@media (min-width:1024px){.nav-links{display:flex}}
.nav-link{
  display:inline-flex;align-items:center;height:44px;padding:0 14px;border-radius:8px;
  color:var(--ink-700);font-size:15px;position:relative;transition:color .2s ease-out,background .2s ease-out;
}
.nav-link:hover{color:var(--brand-600);background:var(--bg-tint)}
.nav-link.is-active{color:var(--brand-600);font-weight:600}
.nav-link.is-active::after{
  content:"";position:absolute;left:14px;right:14px;bottom:4px;height:2px;
  background:var(--brand-600);border-radius:2px;
}
.nav-right{display:flex;align-items:center;gap:10px}
.nav-search-wrap{display:none;align-items:center}
@media (min-width:1024px){.nav-search-wrap{display:flex}}
.search-toggle{
  width:44px;height:44px;border-radius:10px;display:flex;align-items:center;justify-content:center;
  color:var(--ink-700);transition:background .2s ease-out,color .2s ease-out;
}
.search-toggle:hover{background:var(--bg-tint);color:var(--brand-600)}
.nav-search-input{
  width:0;opacity:0;height:40px;border-radius:10px;border:1px solid var(--line);
  padding:0;font-size:14px;color:var(--ink-900);background:#fff;
  transition:width .2s ease-out,opacity .2s ease-out,padding .2s ease-out;
}
.nav-search-wrap.is-open .nav-search-input{width:240px;opacity:1;padding:0 12px;margin-left:6px}
.nav-search-input:focus{outline:none;border-color:var(--brand-600);box-shadow:0 0 0 3px var(--brand-100)}
.nav-burger{
  width:44px;height:44px;border-radius:10px;display:flex;align-items:center;justify-content:center;
  color:var(--ink-900);border:1px solid var(--line);
}
@media (min-width:1024px){.nav-burger{display:none}}
.drawer{
  position:fixed;inset:56px 0 0 0;background:#fff;z-index:55;
  transform:translateY(-8px);opacity:0;visibility:hidden;
  transition:opacity .2s ease-out,transform .2s ease-out,visibility .2s;
  overflow-y:auto;
}
.drawer.is-open{opacity:1;visibility:visible;transform:translateY(0)}
.drawer-link{
  display:flex;align-items:center;justify-content:space-between;
  height:52px;padding:0 20px;border-bottom:1px solid var(--line);
  color:var(--ink-900);font-size:15px;
}
.drawer-link.is-active{color:var(--brand-600);font-weight:600}
.drawer-cta{padding:20px}
body.nav-locked{overflow:hidden}

/* 按钮 */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:0 22px;border-radius:var(--radius-btn);
  font-size:15px;font-weight:600;line-height:1;white-space:nowrap;
  transition:background .2s ease-out,color .2s ease-out,border-color .2s ease-out,transform .2s ease-out,box-shadow .2s ease-out;
}
.btn-primary{background:var(--brand-600);color:#fff}
.btn-primary:hover{background:var(--brand-700);color:#fff;transform:translateY(-1px);box-shadow:var(--shadow-2)}
.btn-primary:active{transform:translateY(0);box-shadow:none}
.btn-ghost{background:#fff;color:var(--ink-700);border:1px solid var(--line)}
.btn-ghost:hover{background:var(--brand-100);color:var(--brand-600);border-color:var(--brand-600)}
.btn-white{background:#fff;color:var(--brand-700)}
.btn-white:hover{background:#F0F5FF;color:var(--brand-700);transform:translateY(-1px)}
.btn-outline-white{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.6)}
.btn-outline-white:hover{background:rgba(255,255,255,.12);color:#fff;border-color:#fff}
.btn-lg{min-height:52px;padding:0 26px;font-size:16px}
.btn-sm{min-height:40px;padding:0 16px;font-size:14px}
.btn:disabled{opacity:.55;cursor:not-allowed;transform:none;box-shadow:none}
.text-link{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--brand-600)}
.text-link:hover{color:var(--brand-700)}
.text-link svg{transition:transform .2s ease-out}
.text-link:hover svg{transform:translateX(4px)}

/* Hero */
.hero{position:relative;overflow:hidden;background:var(--bg-page)}
.hero::before{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:48px 48px;opacity:.45;pointer-events:none;
}
.hero::after{
  content:"";position:absolute;top:-160px;right:-120px;width:520px;height:520px;border-radius:50%;
  background:radial-gradient(circle,rgba(19,89,216,.08) 0%,rgba(19,89,216,0) 70%);pointer-events:none;
}
.hero-inner{position:relative;z-index:1;display:grid;gap:36px;padding-top:40px;padding-bottom:48px}
@media (min-width:1024px){
  .hero-inner{grid-template-columns:7fr 5fr;align-items:center;gap:48px;min-height:calc(100vh - 64px);padding-top:56px;padding-bottom:72px}
}
.hero-title{font-size:clamp(30px,4.2vw,48px);font-weight:700;line-height:1.28;margin-top:18px}
.hero-sub{margin-top:16px;font-size:16px;line-height:1.85;color:var(--ink-700);max-width:560px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.trust-bar{
  display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px 20px;
  margin-top:32px;padding-top:24px;border-top:1px solid var(--line);
}
@media (min-width:768px){.trust-bar{grid-template-columns:repeat(4,minmax(0,1fr))}}
.trust-item dt{font-size:12px;color:var(--ink-500);letter-spacing:.02em}
.trust-item dd{margin-top:4px;font-size:15px;font-weight:600;color:var(--ink-900);font-variant-numeric:tabular-nums}
.hero-visual{position:relative}
.hero-img{
  width:100%;aspect-ratio:16/11;object-fit:cover;border:1px solid var(--line);
  border-radius:18px;box-shadow:var(--shadow-2);
}
.hero-shot{
  position:absolute;right:-8px;bottom:-24px;width:46%;max-width:230px;
  aspect-ratio:16/10;object-fit:cover;border:4px solid #fff;border-radius:14px;
  box-shadow:var(--shadow-2);
}
@media (max-width:639px){
  .hero-img{aspect-ratio:16/10;max-height:260px}
  .hero-shot{width:44%;bottom:-18px;right:0}
}

/* 卡片基础 */
.card{
  background:var(--bg-card);border:1px solid var(--line);border-radius:var(--radius-card);
  box-shadow:var(--shadow-1);transition:box-shadow .2s ease-out,transform .2s ease-out,border-color .2s ease-out;
}
.card:hover{box-shadow:var(--shadow-hover);border-color:#D3E0F7;transform:translateY(-3px)}
.icon-box{
  width:44px;height:44px;border-radius:12px;background:var(--brand-100);
  display:flex;align-items:center;justify-content:center;color:var(--brand-600);flex-shrink:0;
}
.icon-box-accent{background:var(--accent-100);color:#0C7C72}
.num-badge{
  font-size:48px;line-height:1;font-weight:700;color:var(--brand-100);
  font-variant-numeric:tabular-nums;letter-spacing:-.02em;
}
@media (min-width:1024px){.num-badge{font-size:60px}}
.bento{display:grid;gap:20px;grid-template-columns:1fr}
@media (min-width:768px){.bento{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (min-width:1024px){.bento{grid-template-columns:repeat(4,minmax(0,1fr));gap:24px}}
@media (min-width:1024px){
  .bento-large{grid-column:span 2;grid-row:span 2}
  .bento-wide{grid-column:span 2}
}
.bento-card{padding:24px;display:flex;flex-direction:column;gap:12px;position:relative;overflow:hidden}
.bento-large .bento-title{font-size:20px}
.bento-title{font-size:18px;font-weight:600;color:var(--ink-900)}
.bento-desc{font-size:15px;color:var(--ink-700);line-height:1.8}
.bento-visual{
  margin-top:auto;border-radius:14px;overflow:hidden;border:1px solid var(--line);
}
.bento-visual img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:0}

/* 横向轮播 */
.shot-track{
  display:flex;gap:20px;overflow-x:auto;scroll-snap-type:x mandatory;
  padding-bottom:8px;scrollbar-width:none;-ms-overflow-style:none;
}
.shot-track::-webkit-scrollbar{display:none}
.shot-item{flex:0 0 82%;scroll-snap-align:start}
@media (min-width:640px){.shot-item{flex:0 0 46%}}
@media (min-width:1024px){.shot-item{flex:0 0 36%}}
.shot-frame{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#fff;box-shadow:var(--shadow-1)}
.shot-frame img{width:100%;aspect-ratio:16/10;object-fit:cover;border-radius:0}
.shot-cap{padding:14px 16px 16px}
.shot-cap h3{font-size:16px;font-weight:600}
.shot-cap p{margin-top:6px;font-size:13px;color:var(--ink-500);line-height:1.7}
.carousel-nav{display:flex;align-items:center;gap:12px}
.carousel-arrow{
  width:36px;height:36px;border-radius:50%;border:1px solid var(--line);background:#fff;
  display:flex;align-items:center;justify-content:center;color:var(--ink-700);
  transition:border-color .2s ease-out,color .2s ease-out,background .2s ease-out;
}
.carousel-arrow:hover{border-color:var(--brand-600);color:var(--brand-600);background:var(--brand-100)}
.dots{display:flex;align-items:center;gap:8px}
.dot{width:8px;height:8px;border-radius:999px;background:var(--line);transition:background .2s ease-out,width .2s ease-out}
.dot.is-active{background:var(--brand-600);width:22px}

/* 系统要求 */
.req-grid{display:grid;gap:20px;grid-template-columns:1fr}
@media (min-width:640px){.req-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (min-width:1024px){.req-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}}
.req-card{padding:24px}
.req-head{display:flex;align-items:center;gap:12px;padding-bottom:16px;border-bottom:1px solid var(--line)}
.req-head h3{font-size:17px;font-weight:600}
.req-list{margin-top:16px;display:grid;gap:12px}
.req-row{display:flex;align-items:baseline;justify-content:space-between;gap:16px}
.req-row dt{font-size:14px;color:var(--ink-500);white-space:nowrap}
.req-row dd{font-size:15px;color:var(--ink-900);font-weight:600;text-align:right;font-variant-numeric:tabular-nums}
.status-panel{
  margin-top:24px;background:var(--ink-900);border-radius:var(--radius-card);
  padding:24px;display:grid;gap:20px;grid-template-columns:1fr;color:#fff;
}
@media (min-width:768px){.status-panel{grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}}
.status-item{padding-left:16px;border-left:2px solid rgba(255,255,255,.16)}
.status-item span{display:flex;align-items:center;gap:8px;font-size:12px;color:rgba(255,255,255,.6)}
.status-item strong{display:block;margin-top:6px;font-size:17px;font-weight:600;color:#fff;font-variant-numeric:tabular-nums}
.pulse{width:8px;height:8px;border-radius:50%;background:var(--accent-500);box-shadow:0 0 0 4px rgba(18,179,166,.2)}

/* 评价墙 */
.review-wall{columns:1;column-gap:20px}
@media (min-width:640px){.review-wall{columns:2;column-gap:22px}}
.review-card{break-inside:avoid;margin-bottom:22px;padding:22px}
.review-top{display:flex;align-items:center;gap:12px}
.avatar{
  width:40px;height:40px;border-radius:999px;background:var(--bg-tint);
  display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:600;color:var(--brand-700);flex-shrink:0;
}
.review-name{font-size:15px;font-weight:600;color:var(--ink-900)}
.stars{display:flex;gap:2px;margin-top:2px;color:var(--amber-500)}
.review-text{margin-top:14px;font-size:15px;line-height:1.85;color:var(--ink-700)}
.review-foot{margin-top:14px;font-size:12px;color:var(--ink-500)}

/* 下载区 */
.download-box{
  background:var(--bg-tint);border:1px solid var(--line);border-radius:20px;padding:24px;
  display:grid;gap:28px;grid-template-columns:1fr;
}
@media (min-width:768px){.download-box{padding:32px}}
@media (min-width:1024px){.download-box{grid-template-columns:1fr auto;align-items:center}}
.qr-card{
  width:140px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:10px;
  box-shadow:var(--shadow-1);
}
.qr-card svg{width:100%;height:auto;display:block}
.qr-note{margin-top:8px;font-size:12px;color:var(--ink-500);text-align:center}
.platform-btns{display:flex;flex-wrap:wrap;gap:12px;margin-top:20px}
.meta-line{margin-top:16px;display:flex;flex-wrap:wrap;gap:8px 20px;font-size:13px;color:var(--ink-500)}

/* 内容列表 */
.post-grid{display:grid;gap:22px;grid-template-columns:1fr}
@media (min-width:640px){.post-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (min-width:1024px){.post-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
.post-card{display:flex;flex-direction:column;overflow:hidden;padding:0}
.post-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover);border-color:var(--brand-100)}
.post-cover{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:0;border-bottom:1px solid var(--line)}
.post-body{padding:18px;display:flex;flex-direction:column;gap:10px;flex:1}
.post-title{
  font-size:16px;font-weight:600;color:var(--ink-900);line-height:1.5;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.post-sum{
  font-size:14px;color:var(--ink-500);line-height:1.8;
  display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;
}
.post-foot{
  margin-top:auto;padding-top:14px;border-top:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  font-size:12px;color:var(--ink-500);
}
.badge{
  display:inline-flex;align-items:center;height:22px;padding:0 10px;border-radius:999px;
  background:var(--brand-100);color:var(--brand-700);font-size:12px;font-weight:600;
}
.badge-accent{background:var(--accent-100);color:#0C7C72}
.empty-state{
  grid-column:1/-1;padding:48px 24px;text-align:center;background:var(--bg-card);
  border:1px dashed var(--line);border-radius:var(--radius-card);
}
.empty-state p{margin-top:12px;color:var(--ink-500);font-size:14px}

/* FAQ */
.faq-list{display:grid;gap:12px;max-width:900px}
.faq-item{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);
  overflow:hidden;transition:box-shadow .2s ease-out;
}
.faq-item.is-open{box-shadow:inset 3px 0 0 var(--brand-600),var(--shadow-1)}
.faq-q{
  width:100%;min-height:56px;padding:16px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px;
  text-align:left;font-size:16px;font-weight:600;color:var(--ink-900);
}
.faq-q:hover{color:var(--brand-600)}
.faq-icon{flex-shrink:0;color:var(--brand-600);transition:transform .2s ease-out}
.faq-item.is-open .faq-icon{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .25s ease-out}
.faq-item.is-open .faq-a{max-height:340px}
.faq-a p{padding:0 20px 20px;font-size:15px;line-height:1.85;color:var(--ink-700)}

/* 底部 CTA */
.cta-band{
  background:linear-gradient(135deg,var(--brand-600) 0%,var(--brand-700) 100%);
  border-radius:20px;padding:32px;color:#fff;
  display:grid;gap:24px;grid-template-columns:1fr;position:relative;overflow:hidden;
}
@media (min-width:768px){.cta-band{padding:44px}}
@media (min-width:1024px){.cta-band{grid-template-columns:1fr auto;align-items:center}}
.cta-band::before{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.18) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.18) 1px,transparent 1px);
  background-size:40px 40px;opacity:.25;pointer-events:none;
}
.cta-band h2{color:#fff;font-size:clamp(22px,2.4vw,30px);position:relative}
.cta-band p{margin-top:10px;color:rgba(255,255,255,.86);font-size:15px;max-width:560px;position:relative}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px;position:relative}

/* 页脚 */
.site-footer{background:var(--bg-tint);border-top:1px solid var(--line);margin-top:64px}
.footer-grid{display:grid;gap:32px;grid-template-columns:1fr;padding:48px 0 32px}
@media (min-width:640px){.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (min-width:1024px){.footer-grid{grid-template-columns:5fr 3fr 2fr 2fr;gap:40px;padding:56px 0 40px}}
.footer-title{font-size:14px;font-weight:600;color:var(--ink-900);margin-bottom:16px}
.footer-links{display:grid;gap:10px}
.footer-links a{font-size:14px;color:var(--ink-500)}
.footer-links a:hover{color:var(--brand-600)}
.footer-desc{margin-top:14px;font-size:13px;line-height:1.9;color:var(--ink-500);max-width:360px}
.footer-bottom{
  border-top:1px solid var(--line);padding:20px 0 28px;
  display:flex;flex-wrap:wrap;gap:10px 24px;align-items:center;justify-content:space-between;
  font-size:13px;color:var(--ink-500);
}
.footer-bottom a{color:var(--ink-500)}
.footer-bottom a:hover{color:var(--brand-600)}

/* 动效 */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .4s ease-out,transform .4s ease-out}
.reveal.is-visible{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important}
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none}
}
.anchor-offset{scroll-margin-top:72px}

/* roulang page: article */
:root{
  --brand-600:#1359D8;
  --brand-700:#0E45AC;
  --brand-100:#E4EDFC;
  --accent-500:#12B3A6;
  --accent-100:#E1F6F4;
  --accent-700:#0B7A70;
  --amber-500:#F4A32B;
  --ink-900:#0C1B33;
  --ink-700:#2A3B55;
  --ink-500:#5C6B84;
  --line:#E2E8F2;
  --bg-page:#F5F8FC;
  --bg-card:#FFFFFF;
  --bg-tint:#EDF3FD;
  --r-card:16px;
  --r-sm:12px;
  --r-btn:10px;
  --shadow-1:0 1px 2px rgba(12,27,51,.05),0 1px 1px rgba(12,27,51,.04);
  --shadow-2:0 10px 30px -14px rgba(12,27,51,.18);
  --shadow-hover:0 18px 40px -18px rgba(12,27,51,.28);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
  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;border-style:none}
a{color:var(--brand-600)}
button,input{font-family:inherit;font-size:inherit}
h1,h2,h3,h4,p,ul,ol,dl,dd,figure{margin:0}
ul,ol{padding:0}
a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{
  outline:2px solid var(--brand-600);
  outline-offset:2px;
  border-radius:6px;
}
.container{
  width:100%;
  max-width:1200px;
  margin:0 auto;
  padding:0 20px;
}
@media (min-width:1024px){
  .container{padding:0 32px}
}
@media (min-width:1440px){
  .container{max-width:1280px}
}

/* ---------- Header / Nav ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:rgba(255,255,255,.95);
  border-bottom:1px solid var(--line);
  transition:box-shadow .2s ease-out;
}
.site-header.is-scrolled{box-shadow:var(--shadow-1)}
.nav-inner{
  display:flex;
  align-items:center;
  gap:18px;
  height:56px;
}
@media (min-width:1024px){
  .nav-inner{height:64px;gap:26px}
}
.brand{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
  text-decoration:none;
}
.brand-mark{
  width:32px;height:32px;
  border-radius:8px;
  background:var(--brand-600);
  display:grid;place-items:center;
  position:relative;
  flex:0 0 auto;
}
.brand-mark::after{
  content:"";
  position:absolute;
  right:5px;bottom:5px;
  width:7px;height:2px;
  border-radius:2px;
  background:var(--accent-500);
}
.brand-text{
  font-size:16px;
  font-weight:600;
  color:var(--ink-900);
  white-space:nowrap;
  letter-spacing:.01em;
}
.nav-links{
  display:none;
  align-items:center;
  gap:4px;
}
@media (min-width:1024px){
  .nav-links{display:flex}
}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  height:40px;
  padding:0 12px;
  border-radius:8px;
  font-size:15px;
  color:var(--ink-700);
  text-decoration:none;
  white-space:nowrap;
  transition:color .2s ease-out,background-color .2s ease-out;
}
.nav-link:hover{color:var(--brand-700);background:var(--brand-100)}
.nav-link.is-active{color:var(--brand-600);font-weight:600}
.nav-link.is-active::after{
  content:"";
  position:absolute;
  left:12px;right:12px;bottom:2px;
  height:2px;border-radius:2px;
  background:var(--brand-600);
}
.nav-actions{
  margin-left:auto;
  display:flex;
  align-items:center;
  gap:10px;
}
.nav-search{
  display:none;
  align-items:center;
  gap:8px;
  height:44px;
  padding:0 14px;
  border:1px solid var(--line);
  border-radius:var(--r-btn);
  background:#fff;
  transition:border-color .2s ease-out,box-shadow .2s ease-out;
}
.nav-search.is-open{display:flex}
@media (max-width:1023px){
  .nav-search.is-open{display:none}
}
.nav-search:focus-within{border-color:var(--brand-600);box-shadow:0 0 0 3px var(--brand-100)}
.nav-search input{
  width:200px;
  border:none;
  outline:none;
  background:transparent;
  color:var(--ink-900);
  font-size:14px;
  height:42px;
}
.nav-search input::placeholder{color:var(--ink-500)}
.icon-btn{
  width:44px;height:44px;
  display:grid;place-items:center;
  border:1px solid var(--line);
  border-radius:var(--r-btn);
  background:#fff;
  color:var(--ink-700);
  cursor:pointer;
  transition:border-color .2s ease-out,color .2s ease-out,background-color .2s ease-out;
}
.icon-btn:hover{border-color:var(--brand-600);color:var(--brand-600);background:var(--brand-100)}
.nav-toggle{display:grid}
@media (min-width:1024px){
  .nav-toggle{display:none}
}
.nav-cta{display:none}
@media (min-width:1024px){
  .nav-cta{display:inline-flex}
}
.nav-drawer{
  position:fixed;
  left:0;right:0;
  top:56px;
  bottom:0;
  z-index:55;
  background:#fff;
  padding:12px 20px 32px;
  overflow-y:auto;
  opacity:0;
  visibility:hidden;
  transform:translateY(-8px);
  transition:opacity .2s ease-out,transform .2s ease-out,visibility .2s;
}
.nav-drawer.is-open{opacity:1;visibility:visible;transform:translateY(0)}
@media (min-width:1024px){
  .nav-drawer{display:none}
}
.drawer-link{
  display:flex;
  align-items:center;
  justify-content:space-between;
  min-height:48px;
  padding:0 4px;
  border-bottom:1px solid var(--line);
  font-size:16px;
  color:var(--ink-900);
  text-decoration:none;
}
.drawer-link.is-active{color:var(--brand-600);font-weight:600}
.drawer-foot{margin-top:20px;display:grid;gap:10px}
.drawer-note{font-size:13px;color:var(--ink-500);margin-top:16px;line-height:1.7}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:44px;
  height:46px;
  padding:0 22px;
  border-radius:var(--r-btn);
  border:1px solid transparent;
  font-size:15px;
  font-weight:600;
  text-decoration:none;
  cursor:pointer;
  transition:background-color .2s ease-out,color .2s ease-out,border-color .2s ease-out,transform .2s ease-out,box-shadow .2s ease-out;
}
.btn-primary{background:var(--brand-600);color:#fff}
.btn-primary:hover{background:var(--brand-700);transform:translateY(-1px);box-shadow:var(--shadow-2)}
.btn-primary:active{transform:translateY(0);box-shadow:none}
.btn-secondary{background:#fff;border-color:var(--line);color:var(--ink-700)}
.btn-secondary:hover{border-color:var(--brand-600);color:var(--brand-600);background:var(--brand-100)}
.btn-white{background:#fff;color:var(--brand-700)}
.btn-white:hover{background:#F2F6FF;transform:translateY(-1px);box-shadow:var(--shadow-2)}
.btn-ghost-white{background:transparent;border-color:rgba(255,255,255,.65);color:#fff}
.btn-ghost-white:hover{background:rgba(255,255,255,.12)}
.btn-lg{height:52px;padding:0 26px}
.btn-sm{height:40px;min-height:40px;padding:0 16px;font-size:14px}
.btn-block{width:100%}
.btn[disabled]{opacity:.55;cursor:not-allowed;box-shadow:none;transform:none}
.text-link{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-size:14px;
  font-weight:600;
  color:var(--brand-600);
  text-decoration:none;
}
.text-link:hover{color:var(--brand-700);text-decoration:underline;text-underline-offset:4px}
.text-link:hover svg{transform:translateX(4px)}
.text-link svg{transition:transform .2s ease-out}

/* ---------- Tags ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border-radius:999px;
  font-size:12px;
  font-weight:500;
  background:var(--brand-100);
  color:var(--brand-700);
  line-height:1.6;
}
.tag-accent{background:var(--accent-100);color:var(--accent-700)}
.tag-amber{background:#FDF1DE;color:#8A5A0B}
.tag-outline{background:#fff;border:1px solid var(--line);color:var(--ink-500);font-weight:400}

/* ---------- Article hero ---------- */
.article-hero{
  position:relative;
  overflow:hidden;
  background:linear-gradient(180deg,#FFFFFF 0%,var(--bg-tint) 100%);
  border-bottom:1px solid var(--line);
  padding:22px 0 40px;
}
.article-hero::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:52px 52px;
  opacity:.4;
  pointer-events:none;
}
.article-hero > .container{position:relative}
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-size:13px;
  color:var(--ink-500);
}
.breadcrumb a{
  color:var(--brand-600);
  text-decoration:none;
}
.breadcrumb a:hover{color:var(--brand-700);text-decoration:underline;text-underline-offset:4px}
.crumb-sep{color:#A9B7CB}
.crumb-current{color:var(--ink-900)}
.article-head{margin-top:16px}
.article-h1{
  font-size:clamp(26px,3.4vw,38px);
  line-height:1.3;
  font-weight:700;
  color:var(--ink-900);
  margin:14px 0 14px;
  max-width:900px;
}
.meta-row{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px 14px;
  font-size:13px;
  color:var(--ink-500);
}
.meta-item{display:inline-flex;align-items:center;gap:6px}
.meta-divider{width:1px;height:12px;background:var(--line)}
@media (max-width:519px){
  .meta-divider{display:none}
}

/* ---------- Article layout ---------- */
.article-layout{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:36px;
  padding-top:36px;
  padding-bottom:8px;
}
@media (min-width:1280px){
  .article-layout{
    grid-template-columns:minmax(0,780px) 260px;
    justify-content:center;
    gap:56px;
  }
}
.article-card{
  background:var(--bg-card);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  box-shadow:var(--shadow-1);
  padding:22px 20px 28px;
}
@media (min-width:768px){
  .article-card{padding:40px 40px 44px}
}

/* ---------- Article body ---------- */
.article-body{
  font-size:16px;
  line-height:1.9;
  color:var(--ink-700);
  overflow-wrap:break-word;
}
@media (max-width:519px){
  .article-body{font-size:15px}
}
.article-body > * + *{margin-top:1.1em}
.article-body h2{
  position:relative;
  font-size:23px;
  line-height:1.4;
  font-weight:600;
  color:var(--ink-900);
  margin-top:2em;
  padding-left:14px;
  scroll-margin-top:88px;
}
.article-body h2::before{
  content:"";
  position:absolute;
  left:0;top:.24em;bottom:.24em;
  width:4px;border-radius:2px;
  background:var(--brand-600);
}
.article-body h3{
  font-size:18px;
  font-weight:600;
  color:var(--ink-900);
  margin-top:1.7em;
  scroll-margin-top:88px;
}
.article-body p{margin:0}
.article-body a{color:var(--brand-600);text-decoration:underline;text-underline-offset:4px}
.article-body a:hover{color:var(--brand-700)}
.article-body strong{color:var(--ink-900);font-weight:600}
.article-body ul{list-style:none;padding-left:1.25em}
.article-body ul > li{position:relative}
.article-body ul > li::before{
  content:"";
  position:absolute;
  left:-1em;top:.72em;
  width:6px;height:6px;
  border-radius:2px;
  background:var(--brand-600);
}
.article-body ol{list-style:decimal;padding-left:1.5em}
.article-body ol > li::marker{color:var(--brand-600);font-weight:600}
.article-body li + li{margin-top:.45em}
.article-body blockquote{
  margin:1.6em 0;
  background:var(--bg-tint);
  border-left:3px solid var(--accent-500);
  border-radius:10px;
  padding:16px 20px;
  color:var(--ink-700);
}
.article-body blockquote > * + *{margin-top:.6em}
.article-body code{
  background:var(--bg-tint);
  border-radius:4px;
  padding:2px 6px;
  font-size:.92em;
  color:var(--brand-700);
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
.article-body pre{
  background:var(--ink-900);
  color:#E6EEF9;
  border-radius:12px;
  padding:16px 18px;
  overflow-x:auto;
  font-size:14px;
  line-height:1.7;
}
.article-body pre code{background:none;color:inherit;padding:0;font-size:inherit}
.article-body img{
  max-width:100%;
  height:auto;
  margin:1.4em auto;
  border-radius:14px;
  border:1px solid var(--line);
}
.article-body figure{margin:1.6em 0}
.article-body figcaption{
  text-align:center;
  font-size:13px;
  color:var(--ink-500);
  margin-top:10px;
  line-height:1.6;
}
.article-body table{
  width:100%;
  border-collapse:collapse;
  border:1px solid var(--line);
  border-radius:12px;
  overflow:hidden;
  font-size:15px;
}
.article-body th,.article-body td{
  padding:10px 14px;
  text-align:left;
  border-bottom:1px solid var(--line);
}
.article-body thead th{background:var(--bg-tint);color:var(--ink-900);font-weight:600}
.article-body tbody tr:nth-child(even){background:#FAFCFF}
.article-body tbody tr:last-child td{border-bottom:none}
.article-body hr{border:none;border-top:1px solid var(--line);margin:2em 0}

/* ---------- Empty state ---------- */
.empty-state{
  background:var(--bg-tint);
  border:1px dashed #C6D6EE;
  border-radius:var(--r-card);
  padding:52px 24px;
  text-align:center;
}
.empty-icon{
  width:56px;height:56px;
  margin:0 auto 16px;
  border-radius:14px;
  background:#fff;
  border:1px solid var(--line);
  display:grid;place-items:center;
  color:var(--brand-600);
}
.empty-title{font-size:19px;font-weight:600;color:var(--ink-900);margin-bottom:8px}
.empty-desc{font-size:14px;color:var(--ink-500);max-width:460px;margin:0 auto 20px;line-height:1.8}

/* ---------- Article footer bits ---------- */
.article-tags{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  margin-top:32px;
  padding-top:24px;
  border-top:1px solid var(--line);
}
.article-tags .label{font-size:14px;color:var(--ink-500)}
.article-foot-actions{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:12px;
  margin-top:20px;
}

/* ---------- Aside ---------- */
.article-aside{display:grid;gap:20px;align-content:start}
@media (min-width:1280px){
  .article-aside{position:sticky;top:88px}
}
.toc-card{
  background:var(--bg-card);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  box-shadow:var(--shadow-1);
  padding:18px;
}
.toc-title{
  display:flex;
  align-items:center;
  gap:8px;
  font-size:14px;
  font-weight:600;
  color:var(--ink-900);
  margin-bottom:12px;
}
.toc-list{list-style:none;margin:0;padding:0;font-size:14px}
.toc-list li + li{margin-top:2px}
.toc-list a{
  display:block;
  padding:7px 10px;
  border-left:2px solid var(--line);
  color:var(--ink-500);
  text-decoration:none;
  line-height:1.5;
  transition:color .2s ease-out,background-color .2s ease-out,border-color .2s ease-out;
}
.toc-list a:hover{color:var(--brand-600);background:var(--bg-tint)}
.toc-list a.is-current{
  color:var(--brand-600);
  border-left-color:var(--brand-600);
  background:var(--bg-tint);
  font-weight:600;
}
.toc-empty{font-size:13px;color:var(--ink-500);line-height:1.7}
.panel-dark{
  background:#0C1B33;
  border-radius:var(--r-card);
  padding:20px;
  color:#EAF1FB;
  box-shadow:var(--shadow-2);
}
.panel-dark .panel-status{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:12px;
  color:#9FB3CF;
  margin-bottom:12px;
}
.status-dot{
  width:8px;height:8px;
  border-radius:999px;
  background:var(--accent-500);
  box-shadow:0 0 0 3px rgba(18,179,166,.2);
  flex:0 0 auto;
}
.panel-dark h2{
  font-size:17px;
  font-weight:600;
  color:#fff;
  margin-bottom:8px;
}
.panel-dark p{
  font-size:13.5px;
  line-height:1.75;
  color:#A9BCD6;
  margin-bottom:16px;
}
.panel-meta{
  display:flex;
  flex-wrap:wrap;
  gap:6px 14px;
  font-size:12px;
  color:#8FA5C2;
  margin-top:14px;
  padding-top:14px;
  border-top:1px solid rgba(255,255,255,.12);
}

/* ---------- Sections & cards ---------- */
.section{margin-top:64px}
.section-tight{margin-top:48px}
.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:12px;
  margin-bottom:22px;
}
.section-title{
  font-size:clamp(20px,2.4vw,26px);
  font-weight:600;
  color:var(--ink-900);
  line-height:1.35;
}
.section-sub{
  font-size:14px;
  color:var(--ink-500);
  margin-top:6px;
  max-width:640px;
}
.card-grid{
  display:grid;
  gap:20px;
  grid-template-columns:minmax(0,1fr);
}
@media (min-width:640px){
  .card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:1024px){
  .card-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
}
.post-card{
  display:flex;
  flex-direction:column;
  background:var(--bg-card);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  box-shadow:var(--shadow-1);
  overflow:hidden;
  text-decoration:none;
  transition:transform .2s ease-out,box-shadow .2s ease-out,border-color .2s ease-out;
}
.post-card:hover{
  transform:translateY(-3px);
  box-shadow:var(--shadow-hover);
  border-color:#C9DCFA;
}
.post-cover{
  position:relative;
  aspect-ratio:16/9;
  background:var(--bg-tint);
  overflow:hidden;
}
.post-cover img{width:100%;height:100%;object-fit:cover}
.post-body{
  display:flex;
  flex-direction:column;
  gap:10px;
  padding:16px 18px 18px;
  flex:1;
}
.post-title{
  font-size:17px;
  font-weight:600;
  color:var(--ink-900);
  line-height:1.45;
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
}
.post-excerpt{
  font-size:14px;
  color:var(--ink-500);
  line-height:1.7;
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
}
.post-foot{
  margin-top:auto;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  font-size:13px;
  color:var(--ink-500);
}
.post-foot .arrow{transition:transform .2s ease-out;color:var(--brand-600)}
.post-card:hover .post-foot .arrow{transform:translateX(4px)}

/* ---------- FAQ ---------- */
.faq-list{display:grid;gap:12px;max-width:860px}
.faq-item{
  background:var(--bg-card);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  box-shadow:var(--shadow-1);
  overflow:hidden;
}
.faq-q{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  min-height:48px;
  padding:15px 20px;
  border:none;
  background:none;
  text-align:left;
  font-size:16px;
  font-weight:600;
  color:var(--ink-900);
  cursor:pointer;
}
.faq-q:hover{color:var(--brand-600)}
.faq-icon{
  flex:0 0 auto;
  width:20px;height:20px;
  color:var(--brand-600);
  transition:transform .2s ease-out;
}
.faq-item.is-open .faq-icon{transform:rotate(45deg)}
.faq-a{
  display:none;
  padding:0 20px 20px 24px;
  border-left:3px solid transparent;
  font-size:15px;
  line-height:1.8;
  color:var(--ink-700);
}
.faq-item.is-open .faq-a{display:block;border-left-color:var(--brand-600)}

/* ---------- CTA ---------- */
.cta-band{
  margin-top:64px;
  border-radius:20px;
  padding:30px 24px;
  background:linear-gradient(135deg,var(--brand-600) 0%,var(--brand-700) 100%);
  color:#fff;
  display:grid;
  gap:20px;
  box-shadow:var(--shadow-2);
  position:relative;
  overflow:hidden;
}
.cta-band::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:linear-gradient(rgba(255,255,255,.12) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.12) 1px,transparent 1px);
  background-size:48px 48px;
  opacity:.35;
  pointer-events:none;
}
.cta-band > *{position:relative}
@media (min-width:1024px){
  .cta-band{grid-template-columns:minmax(0,1fr) auto;align-items:center;padding:40px}
}
.cta-band h2{font-size:clamp(20px,2.4vw,26px);font-weight:600;color:#fff;line-height:1.4}
.cta-band p{font-size:14.5px;color:rgba(255,255,255,.82);margin-top:8px;max-width:620px;line-height:1.8}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px}
@media (max-width:519px){
  .cta-actions{flex-direction:column}
  .cta-actions .btn{width:100%}
}

/* ---------- Footer ---------- */
.site-footer{
  margin-top:72px;
  background:#fff;
  border-top:1px solid var(--line);
  padding:52px 0 24px;
}
.footer-grid{
  display:grid;
  gap:32px;
  grid-template-columns:minmax(0,1fr);
}
@media (min-width:640px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:1024px){
  .footer-grid{grid-template-columns:5fr 3fr 2fr 2fr;gap:36px}
}
.site-footer .brand{margin-bottom:0}
.footer-desc{
  margin-top:14px;
  font-size:14px;
  color:var(--ink-500);
  line-height:1.8;
  max-width:420px;
}
.footer-title{
  font-size:14px;
  font-weight:600;
  color:var(--ink-900);
  margin-bottom:14px;
}
.footer-links{display:grid;gap:10px}
.footer-links a{
  font-size:14px;
  color:var(--ink-500);
  text-decoration:none;
  transition:color .2s ease-out;
}
.footer-links a:hover{color:var(--brand-600)}
.footer-bottom{
  margin-top:36px;
  padding-top:20px;
  border-top:1px solid var(--line);
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:10px 24px;
  font-size:13px;
  color:var(--ink-500);
}
.footer-bottom a{color:var(--brand-600);text-decoration:none}
.footer-bottom a:hover{text-decoration:underline;text-underline-offset:4px}

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

/* roulang page: category1 */
:root{
  --brand-600:#1359D8;
  --brand-700:#0E45AC;
  --brand-100:#E4EDFC;
  --accent-500:#12B3A6;
  --accent-100:#E1F6F4;
  --amber-500:#F4A32B;
  --ink-900:#0C1B33;
  --ink-700:#2A3B55;
  --ink-500:#5C6B84;
  --line:#E2E8F2;
  --bg-page:#F5F8FC;
  --bg-card:#FFFFFF;
  --bg-tint:#EDF3FD;
  --radius-card:16px;
  --radius-sm:12px;
  --radius-btn:10px;
  --shadow-1:0 1px 2px rgba(12,27,51,.05), 0 1px 1px rgba(12,27,51,.04);
  --shadow-2:0 10px 30px -14px rgba(12,27,51,.18);
  --shadow-hover:0 18px 40px -18px rgba(12,27,51,.28);
  --header-h:64px;
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  margin:0;
  background:var(--bg-page);
  color:var(--ink-700);
  font-family:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.8;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto;}
a{color:var(--brand-600);text-decoration:none;transition:color .2s ease-out;}
a:hover{color:var(--brand-700);text-decoration:underline;text-underline-offset:4px;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
input{font:inherit;}
ul,ol,dl,dd{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4,p{margin:0;}
:focus-visible{outline:2px solid var(--brand-600);outline-offset:2px;border-radius:4px;}
section[id]{scroll-margin-top:72px;}

.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px;}
@media (min-width:768px){.container{padding:0 32px;}}
@media (min-width:1440px){.container{max-width:1280px;}}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(255,255,255,.96);
  border-bottom:1px solid var(--line);
  transition:box-shadow .2s ease-out;
}
.site-header.is-scrolled{box-shadow:var(--shadow-1);}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;height:var(--header-h);}
@media (max-width:1023px){:root{--header-h:56px;}}
.header-left,.header-right{display:flex;align-items:center;gap:16px;}
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--ink-900);font-size:16px;font-weight:600;white-space:nowrap;letter-spacing:.01em;}
.brand:hover{color:var(--ink-900);text-decoration:none;}
.brand-mark{
  width:30px;height:30px;border-radius:8px;background:var(--brand-600);
  display:inline-flex;align-items:center;justify-content:center;position:relative;flex:0 0 auto;
}
.brand-mark::after{content:"";position:absolute;left:7px;right:7px;bottom:6px;height:2px;border-radius:2px;background:var(--accent-500);}
.brand-text{line-height:1.2;}

.nav-links{display:flex;align-items:center;gap:4px;}
.nav-link{
  display:inline-flex;align-items:center;height:40px;padding:0 14px;border-radius:999px;
  font-size:15px;color:var(--ink-700);transition:background .2s ease-out,color .2s ease-out;white-space:nowrap;
}
.nav-link:hover{background:var(--brand-100);color:var(--brand-700);text-decoration:none;}
.nav-link.is-active{background:var(--brand-100);color:var(--brand-600);font-weight:600;}
@media (max-width:1023px){.nav-links{display:none;}}

.search-box{display:flex;align-items:center;gap:6px;}
.icon-btn{
  width:40px;height:40px;display:inline-flex;align-items:center;justify-content:center;
  border-radius:10px;color:var(--ink-700);transition:background .2s ease-out,color .2s ease-out;
}
.icon-btn:hover{background:var(--brand-100);color:var(--brand-600);}
.search-input{
  width:0;height:38px;padding:0;border:1px solid transparent;border-radius:10px;
  opacity:0;pointer-events:none;background:#fff;color:var(--ink-900);
  transition:width .2s ease-out,opacity .2s ease-out,border-color .2s ease-out,padding .2s ease-out;
}
.search-box.is-open .search-input{width:240px;padding:0 12px;opacity:1;pointer-events:auto;border-color:var(--line);}
.search-input:focus{outline:none;border-color:var(--brand-600);box-shadow:0 0 0 3px var(--brand-100);}
@media (max-width:1279px){.search-box.is-open .search-input{width:180px;}}
@media (max-width:1023px){.search-box{display:none;}}

.menu-toggle{
  width:44px;height:44px;display:none;align-items:center;justify-content:center;
  border-radius:10px;color:var(--ink-900);
}
.menu-toggle:hover{background:var(--brand-100);}
@media (max-width:1023px){.menu-toggle{display:inline-flex;}}

.mobile-drawer{
  display:none;position:fixed;left:0;right:0;top:var(--header-h);bottom:0;z-index:55;
  background:#fff;overflow-y:auto;padding:8px 20px 40px;
}
.mobile-drawer.is-open{display:block;}
@media (min-width:1024px){.mobile-drawer{display:none !important;}}
.mobile-drawer a.drawer-link{
  display:flex;align-items:center;min-height:48px;padding:0 4px;font-size:15px;color:var(--ink-700);
  border-bottom:1px solid var(--line);
}
.mobile-drawer a.drawer-link.is-active{color:var(--brand-600);font-weight:600;}
.drawer-search{margin:16px 0;height:44px;width:100%;border:1px solid var(--line);border-radius:12px;padding:0 14px;background:var(--bg-page);}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:0 22px;border-radius:var(--radius-btn);
  font-size:15px;font-weight:500;line-height:1;text-align:center;
  transition:background .2s ease-out,color .2s ease-out,border-color .2s ease-out,box-shadow .2s ease-out,transform .2s ease-out;
}
.btn:hover{text-decoration:none;}
.btn-primary{background:var(--brand-600);color:#fff;box-shadow:var(--shadow-1);}
.btn-primary:hover{background:var(--brand-700);color:#fff;transform:translateY(-1px);box-shadow:var(--shadow-2);}
.btn-primary:active{transform:translateY(0);box-shadow:none;}
.btn-outline{background:#fff;color:var(--ink-700);border:1px solid var(--line);}
.btn-outline:hover{background:var(--brand-100);border-color:var(--brand-600);color:var(--brand-600);}
.btn-white{background:#fff;color:var(--brand-700);}
.btn-white:hover{background:#fff;color:var(--brand-700);transform:translateY(-1px);box-shadow:var(--shadow-2);}
.btn-ghost-white{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.6);}
.btn-ghost-white:hover{background:rgba(255,255,255,.14);color:#fff;border-color:#fff;}
.btn-lg{min-height:52px;padding:0 26px;font-size:16px;}
.btn-block{width:100%;}
.btn[disabled]{opacity:.55;cursor:not-allowed;}
.btn-row{display:flex;flex-wrap:wrap;gap:12px;}
@media (max-width:639px){.btn-row .btn{width:100%;}}

.link-arrow{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:500;}
.link-arrow svg{transition:transform .2s ease-out;}
.link-arrow:hover svg{transform:translateX(4px);}

/* ---------- badges ---------- */
.badge{
  display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:999px;
  font-size:12px;line-height:1.6;font-weight:500;background:var(--brand-100);color:var(--brand-700);
}
.badge-accent{background:var(--accent-100);color:#0A7F76;}
.badge-dot::before{content:"";width:6px;height:6px;border-radius:999px;background:var(--amber-500);display:inline-block;}

/* ---------- hero ---------- */
.cat-hero{
  position:relative;overflow:hidden;
  padding:52px 0 56px;
  background:
    linear-gradient(rgba(245,248,252,.94),rgba(245,248,252,.97)),
    url('/assets/images/backpic/back-1.webp') center / cover no-repeat;
  border-bottom:1px solid var(--line);
}
.cat-hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.05;
  background-image:linear-gradient(var(--brand-600) 1px,transparent 1px),linear-gradient(90deg,var(--brand-600) 1px,transparent 1px);
  background-size:32px 32px;
}
.cat-hero .container{position:relative;z-index:1;}
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--ink-500);margin-bottom:18px;}
.breadcrumb a{color:var(--brand-600);}
.breadcrumb .sep{color:var(--line);}
.breadcrumb .current{color:var(--ink-900);}
.cat-hero h1{
  font-size:clamp(30px,4.2vw,44px);font-weight:700;line-height:1.28;color:var(--ink-900);
  margin:16px 0 14px;max-width:880px;
}
.hero-sub{font-size:16px;color:var(--ink-700);max-width:720px;line-height:1.85;}
.hero-actions{margin-top:26px;}
.hero-stats{
  display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px 14px;
  margin-top:32px;padding-top:22px;border-top:1px solid var(--line);max-width:880px;
}
@media (min-width:768px){.hero-stats{grid-template-columns:repeat(4,minmax(0,1fr));}}
.hero-stats dt{font-size:12px;color:var(--ink-500);}
.hero-stats dd{margin-top:4px;font-size:16px;font-weight:600;color:var(--ink-900);font-variant-numeric:tabular-nums;}

/* ---------- status panel ---------- */
.status-wrap{padding:28px 0 0;}
.status-panel{
  background:var(--ink-900);color:#fff;border-radius:var(--radius-card);
  padding:24px 26px;display:grid;gap:20px;box-shadow:var(--shadow-2);
}
@media (min-width:900px){.status-panel{grid-template-columns:220px 1fr;align-items:center;padding:26px 32px;}}
.status-head{display:flex;align-items:center;gap:10px;font-size:15px;font-weight:600;}
.pulse-dot{width:8px;height:8px;border-radius:999px;background:var(--amber-500);box-shadow:0 0 0 4px rgba(244,163,43,.22);}
.status-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px 20px;}
@media (min-width:768px){.status-grid{grid-template-columns:repeat(4,minmax(0,1fr));}}
.status-grid dt{font-size:12px;color:rgba(255,255,255,.6);}
.status-grid dd{margin-top:4px;font-size:15px;font-weight:600;color:#fff;font-variant-numeric:tabular-nums;}

/* ---------- sections ---------- */
.section{padding:56px 0;}
@media (min-width:1024px){.section{padding:96px 0;}}
.section-tint{background:var(--bg-tint);}
.section-head{max-width:760px;margin-bottom:32px;}
.eyebrow{font-size:13px;font-weight:600;letter-spacing:.12em;color:var(--accent-500);}
.section-title{font-size:clamp(22px,2.6vw,32px);font-weight:600;line-height:1.3;color:var(--ink-900);margin:10px 0 12px;}
.section-desc{font-size:16px;color:var(--ink-700);}

/* ---------- main two column ---------- */
.cat-main{display:grid;gap:32px;}
@media (min-width:1024px){.cat-main{grid-template-columns:minmax(0,1fr) 320px;gap:44px;align-items:start;}}
.prose p{font-size:16px;line-height:1.9;color:var(--ink-700);margin-bottom:16px;}
.prose h3{font-size:19px;font-weight:600;color:var(--ink-900);margin:28px 0 12px;padding-left:12px;border-left:4px solid var(--brand-600);line-height:1.4;}
.figure{margin:26px 0;border-radius:14px;overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow-1);background:var(--bg-card);}
.figure img{width:100%;aspect-ratio:16/10;object-fit:cover;}
.figure figcaption{font-size:13px;color:var(--ink-500);padding:12px 16px;border-top:1px solid var(--line);text-align:center;}

.checklist{display:grid;gap:12px;margin-top:18px;}
@media (min-width:768px){.checklist{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px 20px;}}
.checklist li{
  display:flex;gap:10px;align-items:flex-start;background:var(--bg-card);
  border:1px solid var(--line);border-radius:var(--radius-sm);padding:14px 16px;
  font-size:15px;line-height:1.75;color:var(--ink-700);box-shadow:var(--shadow-1);
}
.checklist li svg{flex:0 0 auto;margin-top:4px;color:var(--accent-500);}

/* ---------- sidebar ---------- */
.side-col{display:flex;flex-direction:column;gap:20px;}
@media (min-width:1024px){.side-col{position:sticky;top:88px;}}
.side-card{background:var(--bg-card);border:1px solid var(--line);border-radius:var(--radius-card);padding:22px;box-shadow:var(--shadow-1);}
.side-title{font-size:15px;font-weight:600;color:var(--ink-900);margin-bottom:14px;}
.anchor-list{display:flex;flex-direction:column;gap:2px;}
.anchor-list a{
  display:block;padding:9px 12px;border-radius:10px;font-size:14px;color:var(--ink-700);
  border-left:3px solid transparent;transition:all .2s ease-out;
}
.anchor-list a:hover{background:var(--brand-100);color:var(--brand-600);text-decoration:none;border-left-color:var(--brand-600);}
.side-dl{background:var(--brand-100);border-color:var(--brand-100);}
.side-dl .side-title{font-size:16px;}
.side-meta{margin-top:14px;display:grid;gap:8px;}
.side-meta div{display:flex;justify-content:space-between;gap:12px;font-size:13px;color:var(--ink-500);}
.side-meta strong{color:var(--ink-900);font-weight:600;font-variant-numeric:tabular-nums;}
.mini-faq{display:grid;gap:12px;}
.mini-faq dt{font-size:14px;font-weight:600;color:var(--ink-900);}
.mini-faq dd{font-size:13px;line-height:1.75;color:var(--ink-500);margin-top:2px;}

/* ---------- cards ---------- */
.card{
  background:var(--bg-card);border:1px solid var(--line);border-radius:var(--radius-card);
  box-shadow:var(--shadow-1);transition:box-shadow .2s ease-out,transform .2s ease-out,border-color .2s ease-out;
}
.card:hover{box-shadow:var(--shadow-hover);transform:translateY(-3px);border-color:var(--brand-100);}
.point-grid{display:grid;gap:20px;}
@media (min-width:768px){.point-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;}}
.point-card{padding:26px 24px 28px;position:relative;overflow:hidden;}
.point-num{
  font-size:52px;font-weight:700;line-height:1;color:var(--brand-100);
  font-variant-numeric:tabular-nums;letter-spacing:-.02em;
}
.point-card h3{font-size:19px;font-weight:600;color:var(--ink-900);margin:6px 0 10px;line-height:1.4;}
.point-card p{font-size:15px;line-height:1.8;color:var(--ink-700);}
.icon-box{
  width:44px;height:44px;border-radius:12px;background:var(--brand-100);color:var(--brand-600);
  display:inline-flex;align-items:center;justify-content:center;margin-bottom:16px;
}
.icon-box.is-accent{background:var(--accent-100);color:#0A7F76;}

/* ---------- platform cards ---------- */
.platform-grid{display:grid;gap:20px;}
@media (min-width:640px){.platform-grid{grid-template-columns:repeat(2,minmax(0,1fr));}}
@media (min-width:1024px){.platform-grid{grid-template-columns:repeat(4,minmax(0,1fr));}}
.platform-card{padding:24px 22px;display:flex;flex-direction:column;gap:14px;}
.platform-card.is-wide{background:linear-gradient(160deg,#fff 0%,#F7FAFF 100%);}
.platform-head{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:600;color:var(--ink-900);}
.spec-list{display:grid;gap:12px;}
.spec-list dt{font-size:13px;color:var(--ink-500);}
.spec-list dd{font-size:15px;color:var(--ink-900);font-weight:500;margin-top:2px;font-variant-numeric:tabular-nums;}
.spec-list>div{padding-top:12px;border-top:1px dashed var(--line);}
.spec-list>div:first-child{padding-top:0;border-top:0;}

/* ---------- download ---------- */
.download-block{
  background:var(--bg-tint);border-radius:20px;padding:28px 24px;
  display:grid;gap:28px;border:1px solid var(--line);
}
@media (min-width:1024px){.download-block{grid-template-columns:minmax(0,1fr) auto;padding:34px 36px;align-items:center;}}
.download-block h2{font-size:clamp(20px,2.2vw,26px);font-weight:600;color:var(--ink-900);margin-bottom:10px;}
.download-block p{font-size:15px;color:var(--ink-700);max-width:620px;}
.after-dl{margin-top:20px;display:flex;flex-wrap:wrap;gap:10px;}
.qr-card{
  width:150px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:12px;
  text-align:center;box-shadow:var(--shadow-1);margin:0 auto;
}
.qr-card svg{width:100%;height:auto;display:block;}
.qr-card span{display:block;font-size:12px;color:var(--ink-500);margin-top:8px;line-height:1.6;}

/* ---------- faq ---------- */
.faq-list{display:grid;gap:12px;max-width:920px;}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);overflow:hidden;box-shadow:var(--shadow-1);transition:border-color .2s ease-out;}
.faq-item.is-open{border-color:var(--brand-100);}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  min-height:44px;padding:18px 22px;text-align:left;font-size:16px;font-weight:600;color:var(--ink-900);
}
.faq-icon{flex:0 0 auto;color:var(--brand-600);transition:transform .2s ease-out;}
.faq-item.is-open .faq-icon{transform:rotate(45deg);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .2s ease-out;}
.faq-item.is-open .faq-a{max-height:460px;}
.faq-a-inner{
  margin:0 22px 20px;padding:12px 4px 0 16px;border-left:3px solid var(--brand-600);
  font-size:15px;line-height:1.85;color:var(--ink-700);
}

/* ---------- cta ---------- */
.cta-band{
  background:linear-gradient(135deg,var(--brand-600) 0%,var(--brand-700) 100%);
  border-radius:20px;padding:34px 28px;color:#fff;
  display:flex;flex-wrap:wrap;gap:22px;align-items:center;justify-content:space-between;
  box-shadow:var(--shadow-2);
}
.cta-band h2{font-size:clamp(20px,2.4vw,28px);font-weight:600;line-height:1.35;}
.cta-band p{font-size:15px;color:rgba(255,255,255,.85);margin-top:8px;max-width:560px;}

/* ---------- footer ---------- */
.site-footer{background:#fff;border-top:1px solid var(--line);margin-top:64px;padding-top:56px;}
.footer-grid{display:grid;gap:32px;}
@media (min-width:640px){.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));}}
@media (min-width:1024px){.footer-grid{grid-template-columns:5fr 3fr 2fr 2fr;gap:40px;}}
.footer-desc{font-size:14px;line-height:1.8;color:var(--ink-500);margin-top:14px;max-width:360px;}
.footer-title{font-size:15px;font-weight:600;color:var(--ink-900);margin-bottom:14px;}
.footer-links{display:flex;flex-direction:column;gap:10px;}
.footer-links a{font-size:14px;color:var(--ink-500);}
.footer-links a:hover{color:var(--brand-600);}
.footer-bottom{
  margin-top:40px;border-top:1px solid var(--line);padding:20px 0;
  display:flex;flex-wrap:wrap;gap:10px 24px;justify-content:space-between;
  font-size:13px;color:var(--ink-500);
}

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

/* roulang page: category2 */
:root{
  --brand-600:#1359D8;
  --brand-700:#0E45AC;
  --brand-100:#E4EDFC;
  --accent-500:#12B3A6;
  --accent-100:#E1F6F4;
  --amber-500:#F4A32B;
  --ink-900:#0C1B33;
  --ink-700:#2A3B55;
  --ink-500:#5C6B84;
  --line:#E2E8F2;
  --bg-page:#F5F8FC;
  --bg-card:#FFFFFF;
  --bg-tint:#EDF3FD;
  --r-card:16px;
  --r-sm:12px;
  --r-btn:10px;
  --shadow-1:0 1px 2px rgba(12,27,51,.05), 0 1px 1px rgba(12,27,51,.04);
  --shadow-2:0 10px 30px -14px rgba(12,27,51,.18);
  --shadow-hover:0 18px 40px -18px rgba(12,27,51,.28);
  --container:1200px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
  font-size:16px;
  line-height:1.8;
  color:var(--ink-700);
  background:var(--bg-page);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border-style:none}
a{color:var(--brand-600);text-decoration:none;transition:color .2s ease-out}
a:hover{color:var(--brand-700);text-decoration:underline;text-underline-offset:4px}
h1,h2,h3,h4{margin:0;color:var(--ink-900);font-weight:600;line-height:1.3}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
button{font:inherit;cursor:pointer;border:0;background:none;color:inherit}
input{font:inherit}
:focus-visible{outline:2px solid var(--brand-600);outline-offset:2px}
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 20px}
@media (min-width:1024px){.container{padding:0 32px}}
.section{padding:56px 0}
@media (min-width:1024px){.section{padding:96px 0}}
.section-head{max-width:720px;margin-bottom:32px}
.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:999px;padding:5px 13px;line-height:1.4}
.eyebrow::before{content:"";width:6px;height:6px;border-radius:999px;background:var(--accent-500);flex:none}
.section-title{font-size:clamp(22px,2.6vw,32px);font-weight:600;line-height:1.3;margin-top:14px}
.section-sub{margin-top:12px;color:var(--ink-500);font-size:15px;line-height:1.85}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 22px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;line-height:1;
  border:1px solid transparent;text-decoration:none;white-space:nowrap;
  transition:background-color .2s ease-out,color .2s ease-out,border-color .2s ease-out,box-shadow .2s ease-out,transform .2s ease-out;
}
.btn:hover{text-decoration:none}
.btn-primary{background:var(--brand-600);color:#fff}
.btn-primary:hover{background:var(--brand-700);color:#fff;transform:translateY(-1px);box-shadow:var(--shadow-2)}
.btn-primary:active{transform:translateY(0);box-shadow:none}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--ink-700)}
.btn-ghost:hover{border-color:var(--brand-600);color:var(--brand-600);background:var(--brand-100)}
.btn-lg{height:52px;padding:0 26px;font-size:16px}
.btn-block{width:100%}
.text-link{display:inline-flex;align-items:center;gap:6px;font-size:15px;font-weight:600;color:var(--brand-600)}
.text-link:hover{gap:10px}
.text-link svg{transition:transform .2s ease-out}
.text-link:hover svg{transform:translateX(4px)}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(255,255,255,.97);
  border-bottom:1px solid var(--line);
  transition:box-shadow .2s ease-out;
}
.site-header.is-scrolled{box-shadow:var(--shadow-1)}
.nav-inner{display:flex;align-items:center;gap:16px;height:64px}
.logo{display:inline-flex;align-items:center;gap:10px;color:var(--ink-900);flex:none}
.logo:hover{color:var(--ink-900);text-decoration:none}
.brand-mark{
  width:30px;height:30px;border-radius:8px;background:var(--brand-600);
  display:inline-flex;align-items:center;justify-content:center;flex:none;position:relative;
}
.brand-mark::after{content:"";position:absolute;right:-2px;bottom:-2px;width:10px;height:10px;border-radius:3px;background:var(--accent-500);border:2px solid #fff}
.brand-text{font-size:16px;font-weight:600;color:var(--ink-900);white-space:nowrap;letter-spacing:.01em}
.nav-links{display:none;align-items:center;gap:4px}
@media (min-width:1024px){.nav-links{display:flex}}
.nav-link{
  display:inline-flex;align-items:center;height:40px;padding:0 14px;border-radius:10px;
  font-size:15px;font-weight:500;color:var(--ink-700);white-space:nowrap;
  transition:background-color .2s ease-out,color .2s ease-out;
}
.nav-link:hover{background:var(--brand-100);color:var(--brand-700);text-decoration:none}
.nav-link.is-active{color:var(--brand-600);background:var(--brand-100);font-weight:600}
.nav-right{margin-left:auto;display:flex;align-items:center;gap:10px}
.icon-btn{
  width:44px;height:44px;border-radius:10px;border:1px solid var(--line);background:#fff;
  display:none;align-items:center;justify-content:center;color:var(--ink-700);
  transition:border-color .2s ease-out,color .2s ease-out,background-color .2s ease-out;
}
.icon-btn:hover{border-color:var(--brand-600);color:var(--brand-600);background:var(--brand-100)}
@media (min-width:1024px){.icon-btn{display:inline-flex}}
.nav-search{display:none;align-items:center}
.nav-search.is-open{display:flex}
.nav-search input{
  width:240px;height:40px;border-radius:10px;border:1px solid var(--line);
  padding:0 14px;font-size:14px;color:var(--ink-900);background:#fff;
  transition:border-color .2s ease-out,box-shadow .2s ease-out;
}
.nav-search input::placeholder{color:var(--ink-500)}
.nav-search input:focus{outline:none;border-color:var(--brand-600);box-shadow:0 0 0 3px var(--brand-100)}
.nav-cta{display:none}
@media (min-width:1024px){.nav-cta{display:inline-flex}}
.menu-btn{
  display:inline-flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;
  width:44px;height:44px;border-radius:10px;border:1px solid var(--line);background:#fff;
}
.menu-btn span{display:block;width:18px;height:2px;border-radius:2px;background:var(--ink-700);transition:transform .2s ease-out,opacity .2s ease-out}
.menu-btn.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.menu-btn.is-open span:nth-child(2){opacity:0}
.menu-btn.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
@media (min-width:1024px){.menu-btn{display:none}}
.drawer{display:none;border-top:1px solid var(--line);background:#fff;padding:12px 0 20px}
.drawer.is-open{display:block}
@media (min-width:1024px){.drawer{display:none!important}}
.drawer-nav{display:grid}
.drawer-nav a{
  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-nav a:hover{color:var(--brand-600);text-decoration:none;background:var(--brand-100)}
.drawer-nav a.is-active{color:var(--brand-600);font-weight:600}
.drawer-cta{margin:18px 20px 0;width:calc(100% - 40px)}
body.drawer-locked{overflow:hidden}

/* ---------- category hero ---------- */
.cat-hero{
  position:relative;overflow:hidden;
  background:var(--bg-tint);
  border-bottom:1px solid var(--line);
  padding:36px 0 48px;
}
.cat-hero::before{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(12,27,51,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(12,27,51,.05) 1px,transparent 1px);
  background-size:48px 48px;
  opacity:.55;pointer-events:none;
  -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.9),transparent 85%);
  mask-image:linear-gradient(180deg,rgba(0,0,0,.9),transparent 85%);
}
.cat-hero .container{position:relative;z-index:1}
.breadcrumb{display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-size:13px;color:var(--ink-500)}
.breadcrumb a{color:var(--brand-600);font-size:13px}
.breadcrumb .sep{color:var(--ink-500);opacity:.65}
.breadcrumb .current{color:var(--ink-900);font-weight:600}
.hero-tag{margin-top:22px}
.cat-hero h1{
  margin-top:16px;
  font-size:clamp(28px,4vw,44px);
  font-weight:700;line-height:1.26;letter-spacing:0;
  max-width:900px;
}
.cat-hero-desc{margin-top:16px;max-width:720px;font-size:16px;color:var(--ink-700);line-height:1.9}
.hero-rail{display:grid;gap:14px;margin-top:32px}
@media (min-width:768px){.hero-rail{grid-template-columns:repeat(3,1fr);gap:18px}}
.rail-item{
  position:relative;display:flex;gap:14px;align-items:flex-start;
  background:#fff;border:1px solid var(--line);border-radius:14px;
  padding:18px 20px;box-shadow:var(--shadow-1);
}
.rail-num{
  font-family:Inter,"PingFang SC",system-ui,sans-serif;
  font-size:34px;font-weight:600;line-height:1;color:var(--brand-100);flex:none;
  letter-spacing:-.02em;
}
.rail-item strong{display:block;font-size:16px;font-weight:600;color:var(--ink-900)}
.rail-item span.rail-text{display:block;margin-top:4px;font-size:13px;color:var(--ink-500);line-height:1.7}

/* ---------- layout ---------- */
.cat-main{display:grid;gap:32px}
@media (min-width:1024px){.cat-main{grid-template-columns:minmax(0,1.55fr) minmax(0,1fr);gap:40px}}
.cat-side{display:grid;gap:20px;align-content:start}
@media (min-width:1024px){.cat-side{position:sticky;top:88px}}

/* ---------- step list ---------- */
.step-list{display:grid;gap:18px}
.step-item{
  display:flex;gap:18px;align-items:flex-start;
  background:var(--bg-card);border:1px solid var(--line);border-radius:var(--r-card);
  padding:22px;box-shadow:var(--shadow-1);
  transition:box-shadow .2s ease-out,transform .2s ease-out,border-color .2s ease-out;
}
.step-item:hover{box-shadow:var(--shadow-hover);transform:translateY(-3px);border-color:var(--brand-100)}
.step-num{
  flex:none;width:48px;height:48px;border-radius:var(--r-sm);
  background:var(--brand-100);color:var(--brand-700);
  display:flex;align-items:center;justify-content:center;
  font-family:Inter,"PingFang SC",system-ui,sans-serif;
  font-size:17px;font-weight:600;letter-spacing:.02em;
}
.step-body h3{font-size:18px;font-weight:600;line-height:1.4}
.step-body p{margin-top:8px;font-size:15px;line-height:1.85;color:var(--ink-700)}
.step-meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.chip{
  display:inline-flex;align-items:center;gap:6px;
  font-size:12px;line-height:1.6;font-weight:500;
  padding:4px 10px;border-radius:999px;
  background:var(--accent-100);color:#0B7C72;
}
.chip-brand{background:var(--brand-100);color:var(--brand-700)}

/* ---------- side card ---------- */
.side-card{
  background:var(--bg-card);border:1px solid var(--line);border-radius:var(--r-card);
  box-shadow:var(--shadow-1);padding:24px;
}
.side-card h3{font-size:17px;font-weight:600}
.side-note{margin-top:6px;font-size:13px;color:var(--ink-500)}
.spec-list{display:grid;gap:0;margin:18px 0 22px}
.spec-row{
  display:flex;justify-content:space-between;align-items:baseline;gap:14px;
  padding:11px 0;border-bottom:1px dashed var(--line);font-size:14px;
}
.spec-row:last-child{border-bottom:0}
.spec-key{color:var(--ink-500);flex:none}
.spec-val{color:var(--ink-900);font-weight:600;text-align:right}
.spec-val.mono{font-family:Inter,"PingFang SC",system-ui,sans-serif;letter-spacing:.01em}
.side-status{
  display:flex;align-items:center;gap:8px;margin-top:16px;padding:10px 12px;
  border-radius:var(--r-sm);background:var(--accent-100);font-size:13px;color:#0B7C72;font-weight:500;
}
.dot{width:8px;height:8px;border-radius:999px;background:var(--accent-500);flex:none;box-shadow:0 0 0 3px rgba(18,179,166,.18)}

/* ---------- feature grid ---------- */
.feature-grid{display:grid;gap:20px}
@media (min-width:640px){.feature-grid{grid-template-columns:repeat(2,1fr)}}
.feature-card{
  position:relative;background:var(--bg-card);border:1px solid var(--line);border-radius:var(--r-card);
  padding:26px 24px 24px;box-shadow:var(--shadow-1);overflow:hidden;
  transition:box-shadow .2s ease-out,transform .2s ease-out,border-color .2s ease-out;
}
.feature-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-3px);border-color:var(--brand-100)}
.feature-index{
  position:absolute;top:14px;left:22px;
  font-family:Inter,system-ui,sans-serif;font-size:52px;font-weight:600;line-height:1;
  color:var(--brand-100);letter-spacing:-.03em;pointer-events:none;
}
.feature-card h3{position:relative;margin-top:52px;font-size:18px;font-weight:600}
.feature-card p{position:relative;margin-top:10px;font-size:15px;line-height:1.85;color:var(--ink-700)}

/* ---------- preview ---------- */
.preview-grid{display:grid;gap:22px}
@media (min-width:768px){.preview-grid{grid-template-columns:repeat(2,1fr)}}
.preview-item{background:var(--bg-card);border:1px solid var(--line);border-radius:var(--r-card);padding:14px;box-shadow:var(--shadow-1);transition:box-shadow .2s ease-out,transform .2s ease-out}
.preview-item:hover{box-shadow:var(--shadow-hover);transform:translateY(-3px)}
.preview-item img{width:100%;aspect-ratio:16/10;object-fit:cover;border-radius:14px;border:1px solid var(--line)}
.preview-cap{margin-top:14px;padding:0 6px 6px}
.preview-cap strong{display:block;font-size:16px;font-weight:600;color:var(--ink-900)}
.preview-cap span{display:block;margin-top:6px;font-size:14px;color:var(--ink-500);line-height:1.75}

/* ---------- dark panel ---------- */
.dark-panel{
  background:var(--ink-900);border-radius:20px;padding:36px 28px;color:#C7D3E6;
  box-shadow:var(--shadow-2);
}
@media (min-width:1024px){.dark-panel{padding:52px 44px}}
.dark-panel h2{color:#fff;font-size:clamp(22px,2.6vw,30px);font-weight:600;line-height:1.35}
.dark-panel .lead{margin-top:14px;max-width:760px;font-size:15px;line-height:1.9;color:#9FB0CB}
.dark-grid{display:grid;gap:18px;margin-top:32px}
@media (min-width:768px){.dark-grid{grid-template-columns:repeat(2,1fr)}}
.dark-card{
  background:rgba(255,255,255,.04);
  border:1px solid rgba(255,255,255,.10);
  border-radius:14px;padding:22px;
}
.dark-card h3{color:#fff;font-size:17px;font-weight:600}
.dark-card p{margin-top:10px;font-size:14px;line-height:1.85;color:#9FB0CB}
.bar{height:5px;border-radius:999px;background:rgba(255,255,255,.10);margin-top:16px;overflow:hidden}
.bar i{display:block;height:100%;border-radius:999px;background:var(--accent-500)}
.bar-label{display:flex;justify-content:space-between;gap:10px;margin-top:8px;font-size:12px;color:#8095B4}
.badge-live{
  display:inline-flex;align-items:center;gap:8px;font-size:12px;font-weight:600;
  color:#7FE3D8;background:rgba(18,179,166,.14);border:1px solid rgba(18,179,166,.35);
  padding:4px 12px;border-radius:999px;
}
.badge-live .dot{box-shadow:0 0 0 3px rgba(18,179,166,.18)}

/* ---------- faq ---------- */
.faq-list{display:grid;gap:12px;max-width:900px}
.faq-item{
  background:var(--bg-card);border:1px solid var(--line);border-radius:var(--r-card);
  box-shadow:var(--shadow-1);overflow:hidden;
}
.faq-item summary{
  list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px 22px;font-size:16px;font-weight:600;color:var(--ink-900);line-height:1.6;
  transition:background-color .2s ease-out;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary:hover{background:var(--bg-tint)}
.faq-plus{
  flex:none;width:24px;height:24px;border-radius:999px;background:var(--brand-100);color:var(--brand-700);
  display:inline-flex;align-items:center;justify-content:center;font-size:16px;font-weight:600;line-height:1;
  transition:transform .2s ease-out;
}
.faq-item[open] summary{box-shadow:inset 3px 0 0 var(--brand-600)}
.faq-item[open] .faq-plus{transform:rotate(45deg)}
.faq-body{padding:0 22px 20px 22px}
.faq-body p{font-size:15px;line-height:1.85;color:var(--ink-700)}

/* ---------- download ---------- */
.download-panel{
  background:var(--bg-tint);border:1px solid var(--line);border-radius:20px;
  padding:28px;display:grid;gap:26px;
}
@media (min-width:768px){.download-panel{grid-template-columns:1fr auto;align-items:center;padding:36px}}
.download-panel h2{font-size:clamp(20px,2.2vw,26px);font-weight:600}
.download-panel p{margin-top:12px;max-width:620px;font-size:15px;line-height:1.85;color:var(--ink-700)}
.dl-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
.dl-qr{display:grid;justify-items:center;gap:10px}
.qr-box{
  width:120px;height:120px;border-radius:14px;background:#fff;border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;text-align:center;
  font-size:12px;color:var(--ink-500);line-height:1.5;padding:12px;
  background-image:linear-gradient(90deg,rgba(12,27,51,.05) 1px,transparent 1px),linear-gradient(rgba(12,27,51,.05) 1px,transparent 1px);
  background-size:12px 12px;
}
.qr-note{font-size:12px;color:var(--ink-500)}

/* ---------- footer ---------- */
.site-footer{background:#fff;border-top:1px solid var(--line);padding:56px 0 24px}
.footer-grid{display:grid;gap:32px}
@media (min-width:768px){.footer-grid{grid-template-columns:repeat(2,1fr);gap:36px}}
@media (min-width:1024px){.footer-grid{grid-template-columns:5fr 3fr 2fr 2fr;gap:40px}}
.site-footer .brand{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.footer-desc{font-size:14px;line-height:1.85;color:var(--ink-500);max-width:360px}
.footer-title{font-size:15px;font-weight:600;color:var(--ink-900);margin-bottom:14px}
.footer-links{display:grid;gap:10px}
.footer-links a{font-size:14px;color:var(--ink-500)}
.footer-links a:hover{color:var(--brand-600)}
.footer-bottom{
  margin-top:40px;padding-top:20px;border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;gap:10px 24px;justify-content:space-between;
  font-size:13px;color:var(--ink-500);
}
.footer-bottom a{font-size:13px;color:var(--ink-500)}
.footer-bottom a:hover{color:var(--brand-600)}

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