/* roulang page: index */
:root{
  --brand-600:#2C6FD1;
  --brand-700:#1E4F9C;
  --brand-050:#EDF3FD;
  --sun-500:#E39B3C;
  --mist-400:#5BB8AE;
  --ink-900:#16202B;
  --ink-600:#4C5C6E;
  --ink-400:#8494A6;
  --line:#E4E9F2;
  --bg:#F6F8FB;
  --card:#FFFFFF;
  --danger:#D64545;
  --radius-lg:16px;
  --radius-xl:24px;
  --shadow-sm:0 1px 2px rgba(22,44,80,.06), 0 12px 32px -12px rgba(22,44,80,.18);
  --shadow-md:0 2px 6px rgba(22,44,80,.08), 0 18px 40px -14px rgba(22,44,80,.24);
  --ease:180ms ease-out;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink-600);
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC","Hiragino Sans GB",system-ui,-apple-system,sans-serif;
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border-radius:12px;object-fit:cover}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul,ol{margin:0;padding:0;list-style:none}
p{margin:0}
h1,h2,h3,h4{margin:0;color:var(--ink-900);font-weight:600;line-height:1.35}
h1{font-size:clamp(30px,5vw,52px);line-height:1.25;font-weight:700;letter-spacing:-.01em}
h2{font-size:clamp(24px,3.2vw,32px);font-weight:600}
h3{font-size:19px;line-height:1.5}
.num{font-variant-numeric:tabular-nums;font-feature-settings:"tnum"}
:focus-visible{outline:2px solid rgba(44,111,209,.5);outline-offset:2px;border-radius:6px}
::selection{background:rgba(44,111,209,.16)}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-thumb{background:#CFD9E8;border-radius:999px;border:2px solid var(--bg)}
::-webkit-scrollbar-track{background:var(--bg)}

/* 容器与通用排版 */
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
@media (min-width:768px){.container{padding:0 32px}}
.section{padding:56px 0}
@media (min-width:768px){.section{padding:80px 0}}
@media (min-width:1024px){.section{padding:96px 0}}
.section-head{margin-bottom:32px}
.section-head h2{margin-bottom:10px}
.section-lead{max-width:660px;font-size:15px;color:var(--ink-400)}
.section-flex{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px}
.divider{height:1px;background:var(--line);border:0;margin:0}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12px;letter-spacing:.08em;color:var(--brand-700);
  background:var(--brand-050);border-radius:999px;padding:5px 12px;
}
.eyebrow::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--brand-600)}

/* 按钮 */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 26px;border-radius:999px;
  font-size:15px;font-weight:500;letter-spacing:.01em;white-space:nowrap;
  transition:background var(--ease),color var(--ease),box-shadow var(--ease),transform var(--ease),border-color var(--ease);
}
.btn-primary{background:var(--brand-600);color:#fff;box-shadow:0 8px 20px -10px rgba(44,111,209,.7)}
.btn-primary:hover{background:var(--brand-700);box-shadow:0 14px 28px -12px rgba(30,79,156,.75);transform:translateY(-1px)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{background:#fff;color:var(--brand-700);border:1px solid rgba(44,111,209,.4)}
.btn-ghost:hover{background:var(--brand-050);border-color:var(--brand-600)}
.btn-sm{height:40px;padding:0 18px;font-size:14px}
.btn-block{width:100%}
.link-more{display:inline-flex;align-items:center;gap:6px;color:var(--brand-600);font-size:14px;font-weight:500}
.link-more::after{content:"→";transition:transform var(--ease)}
.link-more:hover{color:var(--brand-700)}
.link-more:hover::after{transform:translateX(2px)}

/* 顶部导航 */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(8px);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  transition:box-shadow var(--ease);
}
.site-header.is-scrolled{box-shadow:0 6px 24px -18px rgba(22,44,80,.5)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:60px;gap:20px}
@media (min-width:1024px){.header-inner{height:72px}}
.logo{display:flex;align-items:baseline;gap:10px;flex-shrink:0}
.logo-mark{font-size:20px;font-weight:700;color:var(--ink-900);letter-spacing:.02em}
.logo-sub{font-size:11px;line-height:1.2;color:var(--ink-400);display:flex;flex-direction:column;letter-spacing:.1em;text-transform:lowercase}
.logo-sub em{font-style:normal;color:var(--brand-600);font-weight:500}
.nav-desktop{display:none}
@media (min-width:1024px){
  .nav-desktop{display:flex;align-items:center;gap:34px;margin-left:52px;margin-right:auto}
}
.nav-link{position:relative;font-size:15px;font-weight:500;color:var(--ink-600);padding:6px 0;transition:color var(--ease)}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--brand-600);
  transform:scaleX(0);transform-origin:left;transition:transform var(--ease);
}
.nav-link:hover{color:var(--brand-700)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link.active{color:var(--ink-900)}
.nav-link.active::after{transform:scaleX(1)}
.nav-link.active::before{
  content:"";position:absolute;right:-13px;top:50%;width:4px;height:4px;margin-top:-2px;
  border-radius:50%;background:var(--brand-600);
}
.header-actions{display:flex;align-items:center;gap:12px}
.header-cta{display:none}
@media (min-width:640px){.header-cta{display:inline-flex}}
.nav-toggle{
  display:inline-flex;flex-direction:column;justify-content:center;gap:5px;
  width:40px;height:40px;border-radius:10px;border:1px solid var(--line);background:#fff;
}
.nav-toggle span{display:block;width:16px;height:1.5px;background:var(--ink-900);margin:0 auto;transition:transform var(--ease),opacity var(--ease)}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(6.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg)}
@media (min-width:1024px){.nav-toggle{display:none}}
.mobile-drawer{display:none;background:#fff;border-bottom:1px solid var(--line)}
.mobile-drawer.open{display:block}
.mobile-drawer a{
  display:flex;align-items:center;height:52px;font-size:15px;color:var(--ink-600);
  border-bottom:1px solid var(--line);padding-left:14px;position:relative;
}
.mobile-drawer a:last-child{border-bottom:0}
.mobile-drawer a.active{color:var(--brand-700)}
.mobile-drawer a.active::before{content:"";position:absolute;left:0;top:16px;bottom:16px;width:2px;background:var(--brand-600)}
.mobile-drawer .drawer-cta{margin:16px 0;height:48px;justify-content:center;padding-left:0}

/* Hero */
.hero{position:relative;overflow:hidden;background:#fff}
.hero-bg{
  position:absolute;inset:0;
  background-image:url('/assets/images/backpic/back-1.png');
  background-size:cover;background-position:center;
  opacity:.08;pointer-events:none;
}
.hero-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,#fff 0%,rgba(255,255,255,.6) 55%,rgba(255,255,255,.95) 100%)}
.hero-inner{position:relative;display:grid;grid-template-columns:1fr;gap:44px;align-items:center;padding:52px 0 60px}
@media (min-width:1024px){
  .hero-inner{grid-template-columns:6fr 6fr;gap:56px;padding:84px 0 92px}
}
.hero-copy h1{margin:20px 0 18px}
.hero-sub{font-size:17px;line-height:1.85;color:var(--ink-600);max-width:520px}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px}
.hero-note{margin-top:20px;font-size:13px;color:var(--ink-400);letter-spacing:.01em}
.hero-visual{display:flex;justify-content:center}
.phone-frame{
  width:min(300px,78vw);
  background:#fff;border:1px solid var(--line);border-radius:34px;
  padding:10px;box-shadow:var(--shadow-md);
}
.phone-frame .screen{position:relative;border-radius:26px;overflow:hidden;aspect-ratio:9/18.5;background:var(--brand-050)}
.phone-frame .screen img{width:100%;height:100%;border-radius:26px}
.phone-caption{margin-top:12px;text-align:center;font-size:12px;color:var(--ink-400)}

/* 产品价值交错图文 */
.value-list{border-top:1px solid var(--line)}
.value-row{display:grid;grid-template-columns:1fr;gap:26px;align-items:center;padding:36px 0;border-bottom:1px solid var(--line)}
@media (min-width:1024px){
  .value-row{grid-template-columns:6fr 6fr;gap:64px;padding:48px 0}
  .value-row.reverse .value-media{order:-1}
}
.value-index{font-size:13px;font-weight:600;letter-spacing:.14em;color:var(--sun-500);font-variant-numeric:tabular-nums}
.value-text h3{font-size:22px;margin:12px 0 12px}
.value-text p{max-width:520px}
.value-media img{width:100%;aspect-ratio:16/10;border:1px solid var(--line);border-radius:var(--radius-lg)}
.value-row.reverse .value-media img{aspect-ratio:4/3}

/* 功能截图轮播 */
.shots-wrap{position:relative}
.shots-track{
  display:flex;gap:20px;overflow-x:auto;scroll-snap-type:x mandatory;
  padding:4px 4px 18px;scrollbar-width:none;
}
.shots-track::-webkit-scrollbar{display:none}
.shot-card{
  flex:0 0 auto;width:240px;scroll-snap-align:start;
}
.shot-card .shot-screen{
  width:240px;height:480px;border:1px solid var(--line);border-radius:20px;overflow:hidden;
  background:#fff;box-shadow:var(--shadow-sm);transition:transform var(--ease),box-shadow var(--ease),border-color var(--ease);
}
.shot-card .shot-screen img{width:100%;height:100%;border-radius:0}
.shot-card:hover .shot-screen{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:rgba(44,111,209,.35)}
.shot-card figcaption{margin-top:12px;font-size:13px;color:var(--ink-600);text-align:center}
.shots-controls{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-top:8px}
.shots-dots{display:flex;gap:8px}
.shots-dots button{width:7px;height:7px;border-radius:50%;background:#CFD9E8;transition:background var(--ease),transform var(--ease)}
.shots-dots button.active{background:var(--brand-600);transform:scale(1.25)}
.shots-arrows{display:flex;gap:10px}
.arrow-btn{
  width:40px;height:40px;border-radius:50%;border:1px solid var(--line);background:#fff;
  display:inline-flex;align-items:center;justify-content:center;color:var(--ink-600);
  transition:border-color var(--ease),color var(--ease),background var(--ease);
}
.arrow-btn:hover{border-color:var(--brand-600);color:var(--brand-700);background:var(--brand-050)}

/* 系统要求 */
.req-grid{display:grid;grid-template-columns:1fr;gap:20px}
@media (min-width:768px){.req-grid{grid-template-columns:repeat(3,1fr)}}
.req-col{background:var(--card);border:1px solid var(--line);border-radius:var(--radius-lg);padding:24px;box-shadow:var(--shadow-sm)}
.req-col h3{font-size:17px;display:flex;align-items:center;gap:10px;margin-bottom:8px}
.req-col h3 .dot{width:8px;height:8px;border-radius:50%;background:var(--mist-400);flex-shrink:0}
.req-col .req-tip{font-size:13px;color:var(--ink-400);margin-bottom:12px}
.req-row{display:flex;align-items:center;justify-content:space-between;gap:16px;height:48px;border-top:1px solid var(--line);font-size:14px}
.req-row .k{color:var(--ink-400)}
.req-row .v{color:var(--ink-900);font-weight:500;font-variant-numeric:tabular-nums}

/* 评价墙 */
.review-grid{display:flex;gap:16px;overflow-x:auto;scroll-snap-type:x mandatory;padding-bottom:10px}
@media (min-width:1024px){
  .review-grid{display:grid;grid-template-columns:1.15fr 1fr 1fr;grid-auto-rows:auto;gap:20px;overflow:visible;padding-bottom:0}
  .review-feature{grid-row:span 2}
}
.review-card{
  min-width:78%;scroll-snap-align:start;
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:24px;box-shadow:var(--shadow-sm);
  transition:transform var(--ease),box-shadow var(--ease),border-color var(--ease);
}
@media (min-width:1024px){.review-card{min-width:0}}
.review-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md);border-color:rgba(44,111,209,.3)}
.review-head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.review-head img{width:44px;height:44px;border-radius:50%;border:1px solid var(--line)}
.review-name{font-size:15px;color:var(--ink-900);font-weight:500}
.review-meta{font-size:12px;color:var(--ink-400);letter-spacing:.02em}
.stars{display:flex;gap:3px;margin-bottom:10px}
.stars i{width:9px;height:9px;border-radius:50%;background:var(--sun-500);display:inline-block;opacity:.9}
.stars i.off{background:#DCE4EF}
.review-text{font-size:14px;line-height:1.85;color:var(--ink-600)}
.review-feature .review-text{font-size:16px;line-height:1.9}

/* 下载区 */
.download-band{background:var(--brand-050);border:1px solid #DAE6FA;border-radius:var(--radius-xl);padding:36px 24px}
@media (min-width:768px){.download-band{padding:48px 44px}}
.download-band h2{font-size:clamp(22px,2.6vw,28px);margin-bottom:12px}
.download-band .lead{max-width:620px;margin-bottom:26px;font-size:15px}
.download-actions{display:flex;flex-wrap:wrap;gap:14px}
.download-actions .btn{height:54px;padding:0 30px;flex-direction:column;gap:2px;line-height:1.2}
.download-actions .btn span{font-size:15px;font-weight:500}
.download-actions .btn small{font-size:11px;opacity:.8;font-variant-numeric:tabular-nums}
.download-fine{margin-top:20px;font-size:12px;color:var(--ink-400);max-width:640px}

/* 最新信息 */
.news-grid{display:grid;grid-template-columns:1fr;gap:22px}
@media (min-width:1024px){.news-grid{grid-template-columns:7fr 5fr;gap:28px;align-items:start}}
.news-feature{
  display:block;background:var(--card);border:1px solid var(--line);border-radius:var(--radius-lg);
  overflow:hidden;box-shadow:var(--shadow-sm);transition:transform var(--ease),box-shadow var(--ease),border-color var(--ease);
}
.news-feature:hover{transform:translateY(-2px);box-shadow:var(--shadow-md);border-color:rgba(44,111,209,.3)}
.news-feature .cover{aspect-ratio:16/9;overflow:hidden;background:var(--brand-050)}
.news-feature .cover img{width:100%;height:100%;border-radius:0}
.news-feature .body{padding:22px 24px 26px}
.news-feature h3{font-size:20px;margin:12px 0 10px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-feature p{font-size:14px;color:var(--ink-600);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.tag{display:inline-block;background:var(--brand-050);color:var(--brand-700);font-size:12px;padding:3px 10px;border-radius:999px}
.tag-mist{background:rgba(91,184,174,.14);color:#2F7F76}
.meta-time{font-size:12px;color:var(--ink-400);font-variant-numeric:tabular-nums}
.news-list{background:var(--card);border:1px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);overflow:hidden}
.news-row{display:block;padding:18px 20px;border-bottom:1px solid var(--line);transition:color var(--ease),transform var(--ease),background var(--ease)}
.news-list .news-row:last-child{border-bottom:0}
.news-row:hover{color:var(--brand-600);transform:translateX(2px);background:#FBFCFE}
.news-row .row-title{font-size:15px;color:var(--ink-900);font-weight:500;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;transition:color var(--ease)}
.news-row:hover .row-title{color:var(--brand-600)}
.news-row .row-meta{display:flex;align-items:center;gap:10px;margin-top:8px;font-size:12px;color:var(--ink-400);font-variant-numeric:tabular-nums}
.empty-box{border:1px dashed #CFD9E8;border-radius:var(--radius-lg);background:#fff;padding:44px 24px;text-align:center}
.empty-box .empty-icon{width:34px;height:34px;border:1.5px solid var(--ink-400);border-radius:8px;margin:0 auto 14px;position:relative}
.empty-box .empty-icon::after{content:"";position:absolute;left:8px;right:8px;top:11px;height:1.5px;background:var(--ink-400);box-shadow:0 6px 0 var(--ink-400)}
.empty-box p{font-size:14px;color:var(--ink-400);margin-bottom:12px}

/* FAQ */
.faq-list{background:var(--card);border:1px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);overflow:hidden}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item:last-child{border-bottom:0}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;text-align:left;
  padding:20px 24px;font-size:16px;font-weight:500;color:var(--ink-900);transition:color var(--ease);
}
.faq-q:hover{color:var(--brand-700)}
.faq-item.open .faq-q{color:var(--brand-700)}
.faq-icon{position:relative;width:14px;height:14px;flex-shrink:0}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;background:currentColor;border-radius:2px}
.faq-icon::before{left:0;right:0;top:6px;height:1.5px}
.faq-icon::after{top:0;bottom:0;left:6px;width:1.5px;transition:transform var(--ease)}
.faq-item.open .faq-icon::after{transform:scaleY(0)}
.faq-a{max-height:0;overflow:hidden;transition:max-height 220ms ease-out}
.faq-a p{padding:0 24px 22px;font-size:14px;line-height:1.9;color:var(--ink-600);max-width:760px}

/* 底部 CTA 横条 */
.cta-band{
  background:var(--ink-900);color:#C7D2E0;border-radius:var(--radius-xl);
  padding:36px 28px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:24px;
}
.cta-band h2{color:#fff;font-size:clamp(20px,2.4vw,26px);margin-bottom:8px}
.cta-band p{font-size:14px;color:#9FB0C4;max-width:520px}
.cta-band .cta-actions{display:flex;flex-wrap:wrap;gap:12px}
.cta-band .btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.35)}
.cta-band .btn-ghost:hover{background:rgba(255,255,255,.1);border-color:#fff}

/* 页脚 */
.site-footer{background:#fff;border-top:1px solid var(--line);margin-top:20px;padding:52px 0 26px}
.footer-grid{display:grid;grid-template-columns:1fr;gap:32px}
@media (min-width:768px){.footer-grid{grid-template-columns:1.5fr 1fr 1fr 1.3fr;gap:40px}}
.footer-brand .logo-mark{font-size:19px}
.footer-desc{font-size:13px;line-height:1.9;color:var(--ink-400);margin-top:14px;max-width:300px}
.footer-title{font-size:13px;font-weight:600;color:var(--ink-900);letter-spacing:.06em;margin-bottom:14px}
.footer-links li{margin-bottom:10px}
.footer-links a{font-size:13px;color:var(--ink-600);transition:color var(--ease)}
.footer-links a:hover{color:var(--brand-600)}
.footer-note{font-size:13px;line-height:1.9;color:var(--ink-400)}
.footer-bottom{
  margin-top:36px;padding-top:20px;border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;gap:10px 20px;justify-content:space-between;
  font-size:12px;color:var(--ink-400);
}

/* 返回顶部 */
.back-top{
  position:fixed;right:20px;bottom:24px;width:44px;height:44px;border-radius:50%;
  background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-sm);
  display:inline-flex;align-items:center;justify-content:center;color:var(--ink-600);
  opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity var(--ease),transform var(--ease),visibility var(--ease),color var(--ease),border-color var(--ease);
  z-index:50;
}
.back-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.back-top:hover{color:var(--brand-700);border-color:var(--brand-600)}

@media (max-width:519px){
  .hero-cta .btn{width:100%}
  .download-actions .btn{width:100%}
  .cta-band .cta-actions .btn{width:100%}
  .review-card{min-width:86%}
}

/* roulang page: article */
:root{
  --brand-600:#2C6FD1;
  --brand-700:#1E4F9C;
  --brand-050:#EDF3FD;
  --sun-500:#E39B3C;
  --mist-400:#5BB8AE;
  --ink-900:#16202B;
  --ink-600:#4C5C6E;
  --ink-400:#8494A6;
  --line:#E4E9F2;
  --bg:#F6F8FB;
  --card:#FFFFFF;
  --danger:#D64545;
  --radius-card:16px;
  --shadow-card:0 1px 2px rgba(22,44,80,.06), 0 12px 32px -12px rgba(22,44,80,.18);
  --shadow-card-hover:0 2px 4px rgba(22,44,80,.08), 0 18px 40px -14px rgba(22,44,80,.26);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink-600);
  font-family:'PingFang SC','Microsoft YaHei','Noto Sans SC',system-ui,-apple-system,sans-serif;
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button,input,textarea,select{font:inherit;color:inherit}
h1,h2,h3,h4{margin:0;color:var(--ink-900);font-weight:600}
p{margin:0}
ul,ol{margin:0}
:focus-visible{outline:2px solid rgba(44,111,209,.45);outline-offset:2px;border-radius:4px}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
@media (min-width:768px){.container{padding:0 32px}}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(255,255,255,.86);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
  transition:background .2s ease,border-color .2s ease;
}
.site-header.scrolled{background:rgba(255,255,255,.96)}
.header-inner{display:flex;align-items:center;gap:48px;height:72px}
.logo{display:inline-flex;align-items:flex-end;gap:10px}
.logo-mark{font-size:22px;font-weight:700;color:var(--ink-900);letter-spacing:.04em;line-height:1}
.logo-sub{display:inline-flex;flex-direction:column;font-size:10px;line-height:1.2;letter-spacing:.16em;color:var(--ink-400);text-transform:lowercase}
.logo-sub em{font-style:normal;color:var(--brand-600);letter-spacing:.1em}
.nav-desktop{display:flex;align-items:center;gap:32px}
.nav-link{
  position:relative;font-size:15px;font-weight:500;color:var(--ink-600);
  padding:6px 12px 6px 0;transition:color .15s ease;
}
.nav-link::after{
  content:'';position:absolute;left:0;bottom:0;height:2px;width:calc(100% - 12px);
  background:var(--brand-600);transform:scaleX(0);transform-origin:left;transition:transform .16s ease;
}
.nav-link::before{
  content:'';position:absolute;right:0;top:50%;transform:translateY(-50%);
  width:4px;height:4px;border-radius:50%;background:var(--brand-600);opacity:0;transition:opacity .16s ease;
}
.nav-link:hover{color:var(--brand-700)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link.active{color:var(--ink-900)}
.nav-link.active::after{transform:scaleX(1)}
.nav-link.active::before{opacity:1}
.header-actions{margin-left:auto;display:flex;align-items:center;gap:14px}
.nav-toggle{
  display:none;width:40px;height:40px;border:1px solid var(--line);border-radius:10px;background:#fff;
  flex-direction:column;justify-content:center;align-items:center;gap:4px;cursor:pointer;
}
.nav-toggle span{display:block;width:16px;height:1.5px;background:var(--ink-600);transition:transform .2s ease,opacity .2s ease}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}
.mobile-drawer{display:none;background:#fff;border-top:1px solid var(--line)}
.mobile-drawer.open{display:block}
.mobile-drawer a{
  display:flex;align-items:center;min-height:52px;font-size:15px;color:var(--ink-600);
  border-bottom:1px solid var(--line);
}
.mobile-drawer a.active{color:var(--brand-600);border-left:2px solid var(--brand-600);padding-left:12px}
.mobile-drawer .drawer-cta{border-bottom:none;justify-content:center;margin:16px 0}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border:1px solid transparent;border-radius:999px;padding:11px 24px;
  font-size:15px;font-weight:500;line-height:1.2;cursor:pointer;
  transition:background-color .18s ease,color .18s ease,box-shadow .18s ease,border-color .18s ease,transform .18s ease;
}
.btn-primary{background:var(--brand-600);color:#fff}
.btn-primary:hover{background:var(--brand-700);box-shadow:0 10px 24px -10px rgba(30,79,156,.6)}
.btn-outline{background:#fff;border-color:var(--brand-600);color:var(--brand-600)}
.btn-outline:hover{background:var(--brand-050)}
.btn-sm{padding:8px 16px;font-size:14px}
.btn-link{color:var(--brand-600);display:inline-flex;align-items:center;gap:6px;font-size:15px;font-weight:500}
.btn-link .arrow{transition:transform .18s ease}
.btn-link:hover{color:var(--brand-700)}
.btn-link:hover .arrow{transform:translateX(2px)}
.pill{
  display:inline-flex;align-items:center;border-radius:999px;background:var(--brand-050);
  color:var(--brand-700);font-size:12px;line-height:1;padding:6px 12px;letter-spacing:.06em;
}
.pill-mist{background:rgba(91,184,174,.14);color:#2F7E76}

/* ---------- hero strip for article ---------- */
.article-hero{
  position:relative;overflow:hidden;border-bottom:1px solid var(--line);
  background:#fff;
}
.article-hero::before{
  content:'';position:absolute;inset:0;
  background-image:url('/assets/images/backpic/back-2.webp');
  background-size:cover;background-position:center;opacity:.08;
}
.article-hero::after{
  content:'';position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(255,255,255,.6) 0%,rgba(246,248,251,.96) 100%);
}
.article-hero > .container{position:relative;z-index:2;padding-top:22px;padding-bottom:40px}

.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--ink-400)}
.breadcrumb a{color:var(--ink-400)}
.breadcrumb a:hover{color:var(--brand-600)}
.breadcrumb .sep{color:var(--line)}
.breadcrumb .current{color:var(--ink-600);max-width:520px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

.article-head{margin-top:26px;max-width:860px}
.article-head h1{
  font-size:clamp(24px,3.6vw,38px);line-height:1.32;font-weight:700;color:var(--ink-900);letter-spacing:.01em;
}
.article-meta{
  display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-top:18px;
  font-size:13px;color:var(--ink-400);
}
.article-meta time{font-variant-numeric:tabular-nums}
.article-meta .dot{width:4px;height:4px;border-radius:50%;background:var(--line)}

/* ---------- layout ---------- */
.page-body{padding:48px 0 72px}
.article-layout{display:grid;grid-template-columns:minmax(0,1fr);gap:48px}
@media (min-width:1180px){
  .article-layout{grid-template-columns:minmax(0,780px) 232px;justify-content:center;align-items:start}
}
.article-main{min-width:0}
.article-body{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius-card);
  padding:28px 22px;box-shadow:0 1px 2px rgba(22,44,80,.05);
  font-size:17px;line-height:1.9;color:var(--ink-600);overflow-wrap:anywhere;
}
@media (min-width:768px){.article-body{padding:44px 48px}}
.article-body > * + *{margin-top:1.2em}
.article-body h2{
  position:relative;padding-left:16px;margin-top:44px;margin-bottom:0;
  font-size:clamp(20px,2.2vw,26px);line-height:1.35;font-weight:600;color:var(--ink-900);
}
.article-body h2::before{
  content:'';position:absolute;left:0;top:.52em;width:6px;height:6px;border-radius:2px;background:var(--brand-600);
}
.article-body h3{margin-top:34px;font-size:19px;line-height:1.5;font-weight:600;color:var(--ink-900)}
.article-body h4{margin-top:26px;font-size:17px;font-weight:600;color:var(--ink-900)}
.article-body a{color:var(--brand-600);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.article-body a:hover{color:var(--brand-700)}
.article-body strong{color:var(--ink-900)}
.article-body ul,.article-body ol{padding-left:1.35em}
.article-body ul{list-style:disc}
.article-body ol{list-style:decimal}
.article-body li + li{margin-top:.4em}
.article-body blockquote{
  margin:0;padding:16px 20px;border-left:3px solid var(--brand-600);background:var(--brand-050);
  border-radius:0 12px 12px 0;color:var(--ink-600);
}
.article-body img{border-radius:16px;border:1px solid var(--line);width:100%;height:auto}
.article-body figure{margin:0}
.article-body figcaption{margin-top:10px;text-align:center;font-size:13px;color:var(--ink-400)}
.article-body table{width:100%;border-collapse:collapse;font-size:15px}
.article-body th,.article-body td{border:1px solid var(--line);padding:10px 14px;text-align:left}
.article-body th{background:var(--brand-050);color:var(--ink-900);font-weight:600}
.article-body code{background:var(--brand-050);border-radius:6px;padding:2px 6px;font-size:15px;color:var(--brand-700)}
.article-body hr{border:none;border-top:1px solid var(--line);margin:36px 0}
@media (max-width:767px){
  .article-body table{display:block;overflow-x:auto;white-space:nowrap}
}

/* ---------- aside toc ---------- */
.article-aside[hidden]{display:none}
.toc-card{
  position:sticky;top:96px;background:var(--card);border:1px solid var(--line);
  border-radius:var(--radius-card);padding:20px;box-shadow:0 1px 2px rgba(22,44,80,.05);
}
.toc-title{font-size:13px;letter-spacing:.08em;color:var(--ink-400);margin-bottom:12px}
.toc-list{list-style:none;padding:0;font-size:14px}
.toc-list li + li{border-top:1px solid var(--line)}
.toc-list a{display:block;padding:10px 0 10px 12px;color:var(--ink-600);border-left:2px solid transparent;transition:color .16s ease,border-color .16s ease}
.toc-list a:hover{color:var(--brand-600)}
.toc-list a.current{color:var(--brand-600);border-left-color:var(--brand-600);font-weight:500}

/* ---------- tags ---------- */
.tag-row{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:28px}
.tag-row .label{font-size:13px;color:var(--ink-400);margin-right:2px}
.tag{
  display:inline-flex;align-items:center;border-radius:999px;background:var(--brand-050);
  color:var(--brand-700);font-size:13px;padding:7px 14px;transition:background-color .18s ease,color .18s ease;
}
.tag:hover{background:var(--brand-600);color:#fff}

/* ---------- prev / next ---------- */
.sibling-grid{display:grid;grid-template-columns:1fr;gap:16px;margin-top:28px}
@media (min-width:768px){.sibling-grid{grid-template-columns:1fr 1fr}}
.sibling-item{
  display:block;background:var(--card);border:1px solid var(--line);border-radius:var(--radius-card);
  padding:20px 22px;transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease;
}
.sibling-item:hover{transform:translateY(-2px);box-shadow:var(--shadow-card-hover);border-color:rgba(44,111,209,.35)}
.sibling-item .kicker{font-size:12px;letter-spacing:.08em;color:var(--ink-400)}
.sibling-item .title{margin-top:8px;font-size:16px;font-weight:600;color:var(--ink-900);line-height:1.6}
.sibling-item .desc{margin-top:6px;font-size:14px;color:var(--ink-600)}

/* ---------- section ---------- */
.section{margin-top:56px}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:22px}
.section-head h2{font-size:clamp(20px,2.4vw,26px);line-height:1.35;color:var(--ink-900)}
.section-head p{margin-top:6px;font-size:14px;color:var(--ink-400)}

/* ---------- cards ---------- */
.card-grid{display:grid;grid-template-columns:1fr;gap:22px}
@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(--card);border:1px solid var(--line);
  border-radius:var(--radius-card);overflow:hidden;box-shadow:var(--shadow-card);
  transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease;
}
.post-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-card-hover);border-color:rgba(44,111,209,.35)}
.post-card .thumb{aspect-ratio:16/9;overflow:hidden;background:var(--brand-050)}
.post-card .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease}
.post-card:hover .thumb img{transform:scale(1.03)}
.post-card .body{padding:22px 24px 24px;display:flex;flex-direction:column;gap:12px;flex:1}
.post-card h3{font-size:17px;line-height:1.6;color:var(--ink-900);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.post-card p{font-size:14px;color:var(--ink-600);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.post-card .meta{margin-top:auto;display:flex;align-items:center;gap:10px;font-size:13px;color:var(--ink-400);font-variant-numeric:tabular-nums}

/* ---------- cta band ---------- */
.cta-band{
  margin-top:56px;background:var(--brand-050);border:1px solid rgba(44,111,209,.18);
  border-radius:var(--radius-card);padding:30px 26px;
  display:flex;flex-direction:column;gap:20px;
}
@media (min-width:900px){
  .cta-band{flex-direction:row;align-items:center;justify-content:space-between;padding:34px 40px}
}
.cta-band h2{font-size:clamp(19px,2.2vw,24px);line-height:1.4;color:var(--ink-900)}
.cta-band p{margin-top:8px;font-size:14px;color:var(--ink-600);max-width:560px}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px}
.back-link{margin-top:26px}

/* ---------- empty ---------- */
.empty-state{
  text-align:center;border:1px dashed var(--line);border-radius:var(--radius-card);
  padding:48px 24px;background:#fff;
}
.empty-state h2{font-size:20px;color:var(--ink-900)}
.empty-state p{margin-top:12px;font-size:15px;color:var(--ink-600)}
.empty-state .btn{margin-top:22px}

/* ---------- footer ---------- */
.site-footer{margin-top:72px;border-top:1px solid var(--line);background:#fff}
.footer-grid{display:grid;grid-template-columns:1fr;gap:32px;padding:52px 0 36px}
@media (min-width:768px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr 1.4fr;gap:40px}}
.footer-brand .logo{margin-bottom:16px}
.footer-desc{font-size:14px;color:var(--ink-600);max-width:340px}
.footer-title{font-size:13px;letter-spacing:.08em;color:var(--ink-900);font-weight:600;margin-bottom:14px}
.footer-links{list-style:none;padding:0}
.footer-links li + li{margin-top:12px}
.footer-links a{font-size:14px;color:var(--ink-600);transition:color .15s ease}
.footer-links a:hover{color:var(--brand-600)}
.footer-note{font-size:13px;color:var(--ink-400);line-height:1.8}
.footer-bottom{
  border-top:1px solid var(--line);padding:20px 0 28px;display:flex;flex-wrap:wrap;gap:10px;
  justify-content:space-between;font-size:13px;color:var(--ink-400);
}

/* ---------- back to top ---------- */
#toTop{
  position:fixed;right:22px;bottom:26px;width:44px;height:44px;border-radius:50%;
  background:#fff;border:1px solid var(--line);color:var(--ink-600);
  display:flex;align-items:center;justify-content:center;cursor:pointer;
  opacity:0;pointer-events:none;transition:opacity .2s ease,transform .2s ease,box-shadow .2s ease;
  box-shadow:0 1px 2px rgba(22,44,80,.06);
}
#toTop.show{opacity:1;pointer-events:auto}
#toTop:hover{transform:translateY(-2px);color:var(--brand-600);box-shadow:var(--shadow-card)}

@media (max-width:1023px){
  .nav-desktop{display:none}
  .nav-toggle{display:flex}
  .header-cta{display:none}
  .header-inner{gap:16px;height:60px}
  .logo-mark{font-size:20px}
}
@media (max-width:520px){
  .article-head h1{font-size:22px}
  .article-body{padding:22px 18px;font-size:16px}
  .breadcrumb .current{max-width:200px}
  .footer-bottom{flex-direction:column}
}

/* roulang page: category1 */
:root{
  --brand-600:#2C6FD1;
  --brand-700:#1E4F9C;
  --brand-050:#EDF3FD;
  --sun-500:#E39B3C;
  --mist-400:#5BB8AE;
  --ink-900:#16202B;
  --ink-600:#4C5C6E;
  --ink-400:#8494A6;
  --line:#E4E9F2;
  --bg:#F6F8FB;
  --card:#FFFFFF;
  --danger:#D64545;
  --radius:16px;
  --shadow:0 1px 2px rgba(22,44,80,.06), 0 12px 32px -12px rgba(22,44,80,.18);
  --shadow-hover:0 2px 4px rgba(22,44,80,.08), 0 18px 42px -14px rgba(22,44,80,.26);
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.8;
  color:var(--ink-600);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button{font-family:inherit;}
h1,h2,h3,h4{margin:0;color:var(--ink-900);font-weight:700;}
p{margin:0;}
ul{margin:0;padding:0;list-style:none;}
:focus-visible{outline:2px solid rgba(44,111,209,.45);outline-offset:2px;border-radius:6px;}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px;}
@media (min-width:768px){.container{padding:0 32px;}}

.skip-link{position:absolute;left:-9999px;top:0;background:#fff;color:var(--brand-700);padding:10px 16px;border-radius:0 0 10px 0;z-index:200;}
.skip-link:focus{left:0;}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;height:72px;}
.logo{display:flex;flex-direction:column;line-height:1.15;}
.logo-mark{font-size:20px;font-weight:700;color:var(--ink-900);letter-spacing:.06em;}
.logo-sub{font-size:11px;letter-spacing:.12em;color:var(--ink-400);text-transform:uppercase;font-family:Inter,system-ui,sans-serif;}
.logo-sub em{font-style:normal;color:var(--brand-600);margin-left:5px;letter-spacing:.06em;text-transform:none;}
.nav-desktop{display:none;align-items:center;gap:32px;margin-left:56px;}
.nav-link{position:relative;font-size:15px;font-weight:500;color:var(--ink-600);padding:6px 0;transition:color .18s ease-out;}
.nav-link::after{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--brand-600);transform:scaleX(0);transition:transform .18s ease-out;}
.nav-link:hover{color:var(--brand-600);}
.nav-link:hover::after{transform:scaleX(1);}
.nav-link.active{color:var(--brand-600);}
.nav-link.active::after{transform:scaleX(1);}
.nav-link.active::before{content:"";position:absolute;right:-11px;top:50%;width:4px;height:4px;border-radius:50%;background:var(--brand-600);transform:translateY(-50%);}
.header-actions{display:flex;align-items:center;gap:14px;margin-left:auto;}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid transparent;border-radius:999px;font-size:15px;font-weight:500;line-height:1;cursor:pointer;transition:all .2s ease-out;text-align:center;}
.btn-sm{padding:10px 18px;font-size:14px;}
.btn-lg{padding:16px 30px;font-size:16px;}
.btn-primary{background:var(--brand-600);color:#fff;box-shadow:0 6px 18px -8px rgba(44,111,209,.75);}
.btn-primary:hover{background:var(--brand-700);color:#fff;box-shadow:0 10px 26px -8px rgba(30,79,156,.7);}
.btn-ghost{background:#fff;color:var(--brand-700);border-color:var(--brand-600);}
.btn-ghost:hover{background:var(--brand-050);color:var(--brand-700);}
.btn:disabled{background:var(--ink-400);opacity:.7;cursor:not-allowed;}
.header-cta{display:none;}
@media (min-width:1024px){.header-cta{display:inline-flex;}}

.nav-toggle{display:flex;flex-direction:column;justify-content:center;gap:5px;width:40px;height:40px;padding:0;background:transparent;border:1px solid var(--line);border-radius:10px;cursor:pointer;}
.nav-toggle span{display:block;width:18px;height:1.5px;background:var(--ink-900);margin:0 auto;transition:transform .2s ease-out,opacity .2s ease-out;}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(6.5px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg);}
@media (min-width:1024px){
  .nav-desktop{display:flex;}
  .nav-toggle{display:none;}
}
.mobile-drawer{display:none;border-top:1px solid var(--line);background:#fff;padding:8px 0 20px;}
.mobile-drawer.show{display:block;}
.mobile-drawer a{display:block;height:52px;line-height:52px;font-size:15px;color:var(--ink-600);border-bottom:1px solid var(--line);position:relative;padding-left:14px;}
.mobile-drawer a.active{color:var(--brand-600);font-weight:500;}
.mobile-drawer a.active::before{content:"";position:absolute;left:0;top:14px;bottom:14px;width:2px;background:var(--brand-600);border-radius:2px;}
.mobile-drawer .drawer-cta{height:auto;line-height:1;margin-top:18px;color:#fff;border:0;padding:14px 20px;display:inline-flex;justify-content:center;}
@media (min-width:1024px){.mobile-drawer{display:none !important;}}

/* ---------- Page hero ---------- */
.page-hero{position:relative;overflow:hidden;background:var(--brand-050);border-bottom:1px solid var(--line);}
.page-hero::before{content:"";position:absolute;inset:0;background:url('/assets/images/backpic/back-1.png') center/cover no-repeat;opacity:.09;}
.page-hero::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(255,255,255,.35) 0%,rgba(255,255,255,.92) 100%);}
.page-hero .container{position:relative;z-index:2;padding-top:40px;padding-bottom:38px;min-height:200px;display:flex;flex-direction:column;justify-content:center;}
.breadcrumb{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--ink-400);margin-bottom:14px;}
.breadcrumb a{color:var(--ink-400);transition:color .18s;}
.breadcrumb a:hover{color:var(--brand-600);}
.breadcrumb span.sep{color:var(--line);}
.page-hero h1{font-size:clamp(30px,5vw,46px);line-height:1.25;letter-spacing:-.01em;}
.page-hero-desc{margin-top:14px;font-size:16px;color:var(--ink-600);max-width:640px;}
@media (min-width:768px){.page-hero .container{padding-top:52px;padding-bottom:50px;}}

/* ---------- Sections ---------- */
.section{padding:56px 0;}
.section-alt{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
@media (min-width:768px){.section{padding:80px 0;}}
.section-head{max-width:720px;margin-bottom:40px;}
.eyebrow{font-size:12px;letter-spacing:.1em;color:var(--sun-500);font-weight:600;text-transform:uppercase;font-family:Inter,system-ui,sans-serif;margin-bottom:10px;}
.section-head h2{font-size:clamp(24px,3.4vw,32px);line-height:1.35;}
.section-head p{margin-top:12px;font-size:16px;color:var(--ink-600);}

/* ---------- Stat bar ---------- */
.stat-bar{background:#fff;border-bottom:1px solid var(--line);}
.stat-grid{display:grid;grid-template-columns:1fr;gap:0;}
.stat-item{padding:22px 0;border-bottom:1px solid var(--line);display:flex;align-items:baseline;justify-content:space-between;gap:16px;}
.stat-item:last-child{border-bottom:0;}
.stat-label{font-size:13px;color:var(--ink-400);letter-spacing:.06em;}
.stat-value{font-size:20px;font-weight:600;color:var(--ink-900);font-variant-numeric:tabular-nums;font-family:Inter,system-ui,sans-serif;}
.stat-value small{font-size:13px;font-weight:400;color:var(--ink-400);margin-left:6px;font-family:inherit;}
@media (min-width:768px){
  .stat-grid{grid-template-columns:repeat(4,1fr);}
  .stat-item{flex-direction:column;align-items:flex-start;gap:8px;padding:28px 24px;border-bottom:0;border-right:1px solid var(--line);}
  .stat-item:first-child{padding-left:0;}
  .stat-item:last-child{border-right:0;padding-right:0;}
}

/* ---------- Timeline ---------- */
.timeline{position:relative;}
.timeline::before{content:"";position:absolute;left:11px;top:14px;bottom:26px;width:1px;background:var(--line);}
.tl-item{position:relative;padding-left:46px;padding-bottom:36px;}
.tl-item:last-child{padding-bottom:0;}
.tl-dot{position:absolute;left:0;top:4px;width:24px;height:24px;border-radius:50%;background:#fff;border:1px solid var(--line);display:flex;align-items:center;justify-content:center;}
.tl-dot::after{content:"";width:10px;height:10px;border-radius:50%;background:var(--brand-600);}
.tl-idx{font-size:12px;font-weight:600;color:var(--sun-500);letter-spacing:.1em;font-family:Inter,system-ui,sans-serif;}
.tl-item h3{margin-top:6px;font-size:19px;font-weight:600;}
.tl-item p{margin-top:10px;font-size:15.5px;line-height:1.85;color:var(--ink-600);max-width:700px;}
.tl-tag{display:inline-block;margin-top:14px;padding:4px 10px;border-radius:999px;background:var(--brand-050);color:var(--brand-700);font-size:12px;}
.tl-thumb{margin-top:16px;width:100%;max-width:320px;border-radius:12px;border:1px solid var(--line);overflow:hidden;}
.tl-thumb img{width:100%;aspect-ratio:16/9;object-fit:cover;}
@media (min-width:768px){.tl-item{padding-left:56px;}}

/* ---------- Scenario cards ---------- */
.card-grid{display:grid;grid-template-columns:1fr;gap:22px;}
@media (min-width:768px){.card-grid{grid-template-columns:repeat(3,1fr);}}
.scene-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;transition:transform .2s ease-out,box-shadow .2s ease-out,border-color .2s ease-out;}
.scene-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover);border-color:rgba(44,111,209,.28);}
.scene-card .thumb{overflow:hidden;}
.scene-card .thumb img{width:100%;aspect-ratio:4/3;object-fit:cover;}
.scene-body{padding:24px;}
.scene-body h3{font-size:18px;font-weight:600;}
.scene-body p{margin-top:10px;font-size:14.5px;line-height:1.8;color:var(--ink-600);}
.scene-meta{margin-top:16px;padding-top:14px;border-top:1px solid var(--line);font-size:13px;color:var(--ink-400);display:flex;justify-content:space-between;font-variant-numeric:tabular-nums;}

/* ---------- Requirement two columns ---------- */
.req-grid{display:grid;grid-template-columns:1fr;gap:22px;}
@media (min-width:900px){.req-grid{grid-template-columns:1fr 1fr;}}
.req-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px 24px;}
.req-head{display:flex;align-items:center;gap:12px;padding-bottom:18px;border-bottom:1px solid var(--line);}
.req-badge{width:40px;height:40px;border-radius:12px;background:var(--brand-050);display:flex;align-items:center;justify-content:center;color:var(--brand-700);font-size:13px;font-weight:700;letter-spacing:.02em;font-family:Inter,system-ui,sans-serif;}
.req-head h3{font-size:18px;font-weight:600;}
.req-head small{display:block;font-size:12.5px;color:var(--ink-400);font-weight:400;margin-top:2px;}
.param-row{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:48px;border-bottom:1px solid var(--line);font-size:14.5px;}
.param-row:last-child{border-bottom:0;}
.param-name{color:var(--ink-600);}
.param-val{color:var(--ink-900);font-weight:500;font-variant-numeric:tabular-nums;font-family:Inter,system-ui,sans-serif;}
.req-note{margin-top:18px;padding:14px 16px;background:var(--brand-050);border-radius:12px;font-size:13.5px;line-height:1.75;color:var(--brand-700);}

/* ---------- FAQ accordion ---------- */
.accordion{max-width:860px;}
.acc-item{border-bottom:1px solid var(--line);}
.acc-item:first-child{border-top:1px solid var(--line);}
.acc-head{width:100%;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:20px 0;background:none;border:0;text-align:left;font-size:16.5px;font-weight:500;color:var(--ink-900);cursor:pointer;transition:color .18s ease-out;}
.acc-head:hover{color:var(--brand-600);}
.acc-item.open .acc-head{color:var(--brand-600);}
.acc-icon{position:relative;flex:0 0 14px;width:14px;height:14px;}
.acc-icon::before,.acc-icon::after{content:"";position:absolute;background:var(--brand-600);transition:transform .2s ease-out;}
.acc-icon::before{left:0;top:6px;width:14px;height:2px;}
.acc-icon::after{left:6px;top:0;width:2px;height:14px;}
.acc-item.open .acc-icon::after{transform:scaleY(0);}
.acc-body{max-height:0;overflow:hidden;transition:max-height .2s ease-out;}
.acc-body p{padding:0 0 22px;font-size:15.5px;line-height:1.85;color:var(--ink-600);max-width:760px;}

/* ---------- Download CTA ---------- */
.download-band{background:var(--brand-050);border:1px solid var(--line);border-radius:24px;padding:36px 24px;text-align:center;}
@media (min-width:768px){.download-band{padding:52px 48px;}}
.download-band h2{font-size:clamp(24px,3.2vw,30px);line-height:1.35;}
.download-band > p{margin-top:14px;font-size:16px;color:var(--ink-600);max-width:620px;margin-left:auto;margin-right:auto;}
.download-actions{margin-top:30px;display:flex;flex-direction:column;gap:14px;align-items:center;}
@media (min-width:640px){.download-actions{flex-direction:row;justify-content:center;}}
.download-actions .btn small{display:block;font-size:12px;font-weight:400;opacity:.82;margin-top:4px;font-variant-numeric:tabular-nums;}
.download-actions .btn{flex-direction:column;padding:14px 30px;}
.download-tip{margin-top:22px;font-size:12.5px;color:var(--ink-400);line-height:1.7;}

/* ---------- Footer ---------- */
.site-footer{background:#fff;border-top:1px solid var(--line);padding-top:56px;}
.footer-grid{display:grid;grid-template-columns:1fr;gap:34px;padding-bottom:44px;}
@media (min-width:768px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr 1.4fr;gap:32px;}}
.footer-brand .logo{margin-bottom:16px;}
.footer-desc{font-size:14px;line-height:1.85;color:var(--ink-600);max-width:340px;}
.footer-title{font-size:14px;font-weight:600;color:var(--ink-900);margin-bottom:16px;}
.footer-links li{margin-bottom:12px;}
.footer-links a{font-size:14px;color:var(--ink-600);transition:color .18s ease-out;}
.footer-links a:hover{color:var(--brand-600);}
.footer-note{font-size:13.5px;line-height:1.85;color:var(--ink-400);max-width:340px;}
.footer-bottom{border-top:1px solid var(--line);padding:20px 0 28px;display:flex;flex-direction:column;gap:8px;font-size:13px;color:var(--ink-400);}
@media (min-width:768px){.footer-bottom{flex-direction:row;justify-content:space-between;align-items:center;}}

/* ---------- To top ---------- */
.to-top{position:fixed;right:20px;bottom:24px;width:46px;height:46px;border-radius:50%;background:#fff;border:1px solid var(--line);color:var(--brand-600);font-size:16px;display:flex;align-items:center;justify-content:center;cursor:pointer;opacity:0;visibility:hidden;transform:translateY(8px);transition:opacity .2s ease-out,transform .2s ease-out,visibility .2s;z-index:70;box-shadow:var(--shadow);}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0);}
.to-top:hover{background:var(--brand-050);}

@media (max-width:519px){
  .page-hero h1{font-size:26px;}
  .section{padding:48px 0;}
  .title-line{display:block;}
}

/* roulang page: category2 */
:root{
  --brand-600:#2C6FD1;
  --brand-700:#1E4F9C;
  --brand-050:#EDF3FD;
  --sun-500:#E39B3C;
  --mist-400:#5BB8AE;
  --ink-900:#16202B;
  --ink-600:#4C5C6E;
  --ink-400:#8494A6;
  --line:#E4E9F2;
  --bg:#F6F8FB;
  --card:#FFFFFF;
  --danger:#D64545;
  --radius-lg:16px;
  --radius-md:12px;
  --radius-sm:10px;
  --shadow-card:0 1px 2px rgba(22,44,80,.06), 0 12px 32px -12px rgba(22,44,80,.18);
  --shadow-hover:0 2px 6px rgba(22,44,80,.08), 0 20px 44px -16px rgba(22,44,80,.24);
}

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

body{
  margin:0;
  background:var(--bg);
  color:var(--ink-600);
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

img{max-width:100%;display:block;object-fit:cover}
a{color:inherit;text-decoration:none;transition:color .18s ease}
button,input,textarea,select{font:inherit;color:inherit}
h1,h2,h3,h4,p,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible{
  outline:2px solid rgba(44,111,209,.45);
  outline-offset:2px;
  border-radius:6px;
}

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

/* ============ 页头 ============ */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  height:60px;
  gap:16px;
}
@media (min-width:1024px){
  .header-inner{height:72px}
}
.logo{display:flex;flex-direction:column;line-height:1.15;min-width:0}
.logo-mark{
  font-size:18px;
  font-weight:700;
  color:var(--ink-900);
  letter-spacing:.06em;
}
.logo-sub{
  display:flex;
  align-items:center;
  gap:4px;
  font-size:11px;
  letter-spacing:.16em;
  color:var(--ink-400);
  text-transform:lowercase;
}
.logo-sub em{font-style:normal;color:var(--brand-600);letter-spacing:.06em}

.nav-desktop{display:none}
@media (min-width:1024px){
  .nav-desktop{
    display:flex;
    align-items:center;
    gap:34px;
    margin-left:56px;
    margin-right:auto;
  }
}
.nav-link{
  position:relative;
  font-size:15px;
  font-weight:500;
  color:var(--ink-600);
  padding:6px 0;
  white-space:nowrap;
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  width:100%;
  height:2px;
  background:var(--brand-600);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .18s ease;
}
.nav-link:hover{color:var(--brand-600)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link.active{color:var(--brand-600)}
.nav-link.active::after{transform:scaleX(1)}
.nav-link.active::before{
  content:"";
  position:absolute;
  right:-12px;
  top:50%;
  width:4px;
  height:4px;
  margin-top:-2px;
  border-radius:50%;
  background:var(--brand-600);
}
.header-actions{display:flex;align-items:center;gap:12px}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  border-radius:999px;
  border:1px solid transparent;
  font-size:15px;
  font-weight:500;
  line-height:1;
  padding:13px 26px;
  cursor:pointer;
  white-space:nowrap;
  transition:background-color .2s ease,color .2s ease,border-color .2s ease,box-shadow .2s ease,transform .2s ease;
}
.btn-primary{background:var(--brand-600);color:#fff}
.btn-primary:hover{background:var(--brand-700);box-shadow:0 12px 26px -12px rgba(44,111,209,.65);transform:translateY(-1px)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{background:#fff;border-color:rgba(44,111,209,.45);color:var(--brand-700)}
.btn-ghost:hover{background:var(--brand-050);border-color:var(--brand-600)}
.btn-sm{padding:10px 18px;font-size:14px}
.btn-block{width:100%}
.link-arrow{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-size:14px;
  font-weight:500;
  color:var(--brand-600);
}
.link-arrow span{
  display:inline-block;
  transition:transform .18s ease;
}
.link-arrow:hover{color:var(--brand-700)}
.link-arrow:hover span{transform:translateX(2px)}

/* 移动导航 */
.nav-toggle{
  display:none;
  width:40px;
  height:40px;
  border:1px solid var(--line);
  border-radius:var(--radius-sm);
  background:#fff;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:4px;
  cursor:pointer;
}
.nav-toggle span{display:block;width:16px;height:1.5px;background:var(--ink-900);border-radius:2px}
@media (max-width:1023px){
  .nav-toggle{display:flex}
}
@media (max-width:767px){
  .header-cta{display:none}
}
.mobile-drawer{
  max-height:0;
  overflow:hidden;
  background:#fff;
  border-top:1px solid transparent;
  transition:max-height .28s ease,border-color .28s ease;
}
.mobile-drawer.open{max-height:460px;border-top-color:var(--line)}
.mobile-drawer .container{display:flex;flex-direction:column;padding-top:6px;padding-bottom:20px}
.mobile-drawer a{
  padding:15px 4px;
  font-size:16px;
  color:var(--ink-600);
  border-bottom:1px solid var(--line);
}
.mobile-drawer a.active{
  color:var(--brand-600);
  font-weight:500;
  border-left:2px solid var(--brand-600);
  padding-left:12px;
}
.mobile-drawer .drawer-cta{
  margin-top:18px;
  border-bottom:none;
  color:#fff;
  padding:14px 26px;
}
.mobile-drawer .drawer-cta.active{color:#fff;border-left:none;padding-left:26px}

/* ============ 面包屑 ============ */
.breadcrumb{
  padding:20px 0 0;
  font-size:13px;
  color:var(--ink-400);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
}
.breadcrumb a:hover{color:var(--brand-600)}
.breadcrumb .sep{color:#C6D0DE}
.breadcrumb .current{color:var(--ink-600)}

/* ============ 页头窄幅 ============ */
.page-head{
  position:relative;
  padding:34px 0 36px;
  border-bottom:1px solid var(--line);
  background:#fff;
  overflow:hidden;
}
.page-head::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:url('/assets/images/backpic/back-2.webp');
  background-size:cover;
  background-position:center;
  opacity:.07;
  pointer-events:none;
}
.page-head .container{position:relative;z-index:1}
.page-eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:12px;
  letter-spacing:.1em;
  color:var(--brand-700);
  background:var(--brand-050);
  border-radius:999px;
  padding:5px 12px;
}
.page-head h1{
  margin-top:18px;
  font-size:clamp(28px,4.4vw,44px);
  font-weight:700;
  line-height:1.28;
  color:var(--ink-900);
  letter-spacing:.01em;
  max-width:860px;
}
.page-head .lead{
  margin-top:14px;
  font-size:16px;
  color:var(--ink-600);
  max-width:680px;
}

/* ============ 深色数据条 ============ */
.band-dark{
  background:#16202B;
  color:#D8E0EA;
  padding:38px 0;
}
.band-dark .band-title{
  font-size:13px;
  letter-spacing:.14em;
  color:#8FA1B5;
  margin-bottom:22px;
}
.band-grid{
  display:grid;
  gap:22px;
  grid-template-columns:1fr;
}
@media (min-width:640px){.band-grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:1024px){.band-grid{grid-template-columns:repeat(4,1fr);gap:28px}}
.band-item{
  border-top:1px solid rgba(255,255,255,.14);
  padding-top:16px;
}
.band-num{
  font-size:13px;
  font-weight:600;
  color:var(--sun-500);
  letter-spacing:.08em;
  font-variant-numeric:tabular-nums;
}
.band-item h3{
  margin-top:8px;
  font-size:17px;
  font-weight:600;
  color:#FFFFFF;
}
.band-item p{
  margin-top:8px;
  font-size:14px;
  line-height:1.75;
  color:#9DAEC2;
}

/* ============ 通用板块 ============ */
.section{padding:56px 0}
@media (min-width:1024px){.section{padding:80px 0}}

.toc-card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow-card);
  padding:22px 22px 14px;
}
.toc-title{
  font-size:12px;
  letter-spacing:.14em;
  color:var(--ink-400);
  padding-bottom:14px;
  border-bottom:1px solid var(--line);
}
.toc-link{
  display:flex;
  align-items:baseline;
  gap:10px;
  padding:13px 0 13px 14px;
  border-left:2px solid transparent;
  border-bottom:1px solid var(--line);
  font-size:15px;
  color:var(--ink-600);
  transition:color .18s ease,border-color .18s ease,background-color .18s ease;
}
.toc-link:last-child{border-bottom:none}
.toc-link em{
  font-style:normal;
  font-size:12px;
  color:var(--ink-400);
  font-variant-numeric:tabular-nums;
  letter-spacing:.08em;
}
.toc-link:hover{color:var(--brand-600);background:var(--brand-050)}
.toc-link.is-active{
  color:var(--brand-600);
  border-left-color:var(--brand-600);
  font-weight:500;
  background:linear-gradient(90deg,rgba(44,111,209,.07),rgba(44,111,209,0));
}
.toc-link.is-active em{color:var(--brand-600)}

.side-note{
  margin-top:20px;
  background:var(--brand-050);
  border-radius:var(--radius-lg);
  padding:22px;
  border:1px solid rgba(44,111,209,.14);
}
.side-note h3{
  font-size:15px;
  font-weight:600;
  color:var(--ink-900);
}
.side-note p{
  margin-top:10px;
  font-size:14px;
  line-height:1.8;
  color:var(--ink-600);
}
.side-note .link-arrow{margin-top:14px}

.sticky-block{position:static}
@media (min-width:1024px){
  .sticky-block{position:sticky;top:96px}
}

/* ============ 内容小节 ============ */
.block{
  padding-bottom:44px;
  margin-bottom:44px;
  border-bottom:1px solid var(--line);
}
.block:last-child{padding-bottom:0;margin-bottom:0;border-bottom:none}
.block-head{
  display:flex;
  align-items:baseline;
  gap:12px;
  margin-bottom:18px;
}
.block-num{
  font-size:13px;
  font-weight:600;
  letter-spacing:.1em;
  color:var(--sun-500);
  font-variant-numeric:tabular-nums;
}
.block-head h2{
  font-size:clamp(20px,2.6vw,26px);
  font-weight:600;
  line-height:1.4;
  color:var(--ink-900);
}
.block p.body-text{
  font-size:16px;
  line-height:1.85;
  color:var(--ink-600);
}
.block p.body-text + p.body-text{margin-top:14px}

.line-list{margin-top:20px;border-top:1px solid var(--line)}
.line-list li{
  display:flex;
  gap:12px;
  padding:14px 0;
  border-bottom:1px solid var(--line);
  font-size:15px;
  color:var(--ink-600);
}
.line-list li svg{flex:0 0 18px;margin-top:5px;color:var(--brand-600)}
.line-list li strong{
  font-weight:600;
  color:var(--ink-900);
}

.split{
  display:grid;
  gap:26px;
  grid-template-columns:1fr;
  align-items:start;
  margin-top:22px;
}
@media (min-width:768px){
  .split{grid-template-columns:1fr 1fr;gap:32px;align-items:center}
}
.figure{
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  overflow:hidden;
  background:#fff;
  box-shadow:var(--shadow-card);
}
.figure img{width:100%;height:100%}
.figure-vertical img{aspect-ratio:3/4}
.figure-wide img{aspect-ratio:16/9}
.figure figcaption{
  padding:12px 16px;
  font-size:13px;
  color:var(--ink-400);
  border-top:1px solid var(--line);
}

.steps{margin-top:18px;display:flex;flex-direction:column;gap:0}
.step{
  display:flex;
  gap:16px;
  padding:16px 0;
  border-bottom:1px solid var(--line);
}
.step:last-child{border-bottom:none}
.step-index{
  flex:0 0 30px;
  height:30px;
  border-radius:50%;
  background:var(--brand-050);
  color:var(--brand-700);
  font-size:13px;
  font-weight:600;
  display:flex;
  align-items:center;
  justify-content:center;
  font-variant-numeric:tabular-nums;
}
.step-body h3{
  font-size:16px;
  font-weight:600;
  color:var(--ink-900);
}
.step-body p{
  margin-top:6px;
  font-size:14.5px;
  line-height:1.8;
  color:var(--ink-600);
}

.notice{
  margin-top:22px;
  display:flex;
  gap:14px;
  padding:18px 20px;
  border-radius:var(--radius-md);
  background:var(--brand-050);
  border-left:3px solid var(--brand-600);
}
.notice.mist{
  background:rgba(91,184,174,.1);
  border-left-color:var(--mist-400);
}
.notice svg{flex:0 0 20px;margin-top:3px;color:var(--brand-600)}
.notice.mist svg{color:#2F8479}
.notice p{font-size:14.5px;line-height:1.8;color:var(--ink-600)}
.notice strong{color:var(--ink-900);font-weight:600}

/* 记录行表 */
.record-table{margin-top:20px;border:1px solid var(--line);border-radius:var(--radius-md);overflow:hidden;background:#fff}
.record-row{
  display:grid;
  grid-template-columns:1.2fr 1fr 1fr .8fr;
  gap:10px;
  padding:14px 18px;
  font-size:14px;
  border-bottom:1px solid var(--line);
  font-variant-numeric:tabular-nums;
}
.record-row:last-child{border-bottom:none}
.record-row.head{
  background:#FAFBFD;
  color:var(--ink-400);
  font-size:12.5px;
  letter-spacing:.06em;
}
.record-row span:first-child{color:var(--ink-900);font-weight:500}
.record-row .ok{color:#2F8479}
@media (max-width:639px){
  .record-row{grid-template-columns:1fr 1fr;gap:6px 12px;font-size:13.5px}
  .record-row.head{display:none}
}

/* ============ 表单 ============ */
.form-wrap{max-width:640px;margin:0 auto}
.form-card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow-card);
  padding:26px 22px;
}
@media (min-width:768px){.form-card{padding:34px}}
.form-field{margin-bottom:20px}
.form-field label{
  display:block;
  font-size:14px;
  font-weight:500;
  color:var(--ink-900);
  margin-bottom:8px;
}
.form-field .hint{
  display:block;
  font-size:12.5px;
  color:var(--ink-400);
  margin-bottom:8px;
}
.form-field input,
.form-field textarea{
  width:100%;
  min-height:44px;
  padding:11px 14px;
  border:1px solid var(--line);
  border-radius:var(--radius-sm);
  background:#fff;
  font-size:15px;
  color:var(--ink-900);
  transition:border-color .18s ease,box-shadow .18s ease;
}
.form-field textarea{min-height:120px;resize:vertical;line-height:1.7}
.form-field input::placeholder,
.form-field textarea::placeholder{color:#AEB9C7}
.form-field input:focus,
.form-field textarea:focus{
  outline:none;
  border-color:var(--brand-600);
  box-shadow:0 0 0 3px rgba(44,111,209,.16);
}
.field-error{
  display:none;
  margin-top:7px;
  font-size:12.5px;
  color:var(--danger);
}
.form-field.has-error input,
.form-field.has-error textarea{border-color:var(--danger)}
.form-field.has-error .field-error{display:block}
.form-foot{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  margin-top:22px;
}
.form-foot .tip{font-size:12.5px;color:var(--ink-400);max-width:320px;line-height:1.7}
.form-success{
  display:none;
  margin-top:18px;
  padding:14px 18px;
  border-radius:var(--radius-md);
  background:rgba(91,184,174,.12);
  border-left:3px solid var(--mist-400);
  font-size:14px;
  color:#255F58;
}
.form-success.show{display:block}

/* ============ FAQ ============ */
.faq-list{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  padding:20px 2px;
  background:none;
  border:none;
  text-align:left;
  font-size:16.5px;
  font-weight:500;
  color:var(--ink-900);
  cursor:pointer;
  transition:color .18s ease;
}
.faq-q:hover{color:var(--brand-600)}
.faq-q[aria-expanded="true"]{color:var(--brand-600)}
.faq-icon{
  position:relative;
  flex:0 0 16px;
  width:16px;
  height:16px;
  color:currentColor;
}
.faq-icon::before,
.faq-icon::after{
  content:"";
  position:absolute;
  background:currentColor;
  transition:transform .2s ease,opacity .2s ease;
}
.faq-icon::before{left:0;top:7.25px;width:16px;height:1.5px}
.faq-icon::after{left:7.25px;top:0;width:1.5px;height:16px}
.faq-q[aria-expanded="true"] .faq-icon::after{transform:scaleY(0);opacity:0}
.faq-a{
  max-height:0;
  overflow:hidden;
  transition:max-height .2s ease;
}
.faq-a-inner{
  padding:0 40px 22px 2px;
  font-size:15px;
  line-height:1.85;
  color:var(--ink-600);
}

/* ============ CTA 横条 ============ */
.cta-band{
  background:var(--brand-050);
  border-radius:var(--radius-lg);
  padding:28px 24px;
  display:flex;
  flex-direction:column;
  gap:20px;
}
@media (min-width:900px){
  .cta-band{
    flex-direction:row;
    align-items:center;
    justify-content:space-between;
    padding:32px 40px;
  }
}
.cta-band h2{
  font-size:clamp(19px,2.4vw,24px);
  font-weight:600;
  color:var(--ink-900);
  line-height:1.45;
}
.cta-band p{
  margin-top:8px;
  font-size:14.5px;
  color:var(--ink-600);
  max-width:520px;
}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px}

/* ============ 页脚 ============ */
.site-footer{
  margin-top:72px;
  background:#fff;
  border-top:1px solid var(--line);
  padding:56px 0 24px;
}
@media (min-width:1024px){.site-footer{margin-top:96px}}
.footer-grid{
  display:grid;
  gap:34px;
  grid-template-columns:1fr;
}
@media (min-width:768px){.footer-grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:1024px){.footer-grid{grid-template-columns:1.5fr 1fr 1fr 1.4fr;gap:48px}}
.footer-desc{
  margin-top:16px;
  font-size:14px;
  line-height:1.85;
  color:var(--ink-600);
  max-width:340px;
}
.footer-title{
  font-size:14px;
  font-weight:600;
  color:var(--ink-900);
  letter-spacing:.06em;
  margin-bottom:16px;
}
.footer-links{display:flex;flex-direction:column;gap:12px}
.footer-links a{font-size:14px;color:var(--ink-600)}
.footer-links a:hover{color:var(--brand-600)}
.footer-note{
  font-size:13px;
  line-height:1.85;
  color:var(--ink-400);
}
.footer-bottom{
  margin-top:44px;
  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-400);
}

/* 返回顶部 */
.to-top{
  position:fixed;
  right:20px;
  bottom:24px;
  width:44px;
  height:44px;
  border-radius:50%;
  background:#fff;
  border:1px solid var(--line);
  color:var(--ink-600);
  display:flex;
  align-items:center;
  justify-content:center;
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transform:translateY(6px);
  transition:opacity .22s ease,transform .22s ease,visibility .22s ease,border-color .18s ease,color .18s ease;
  z-index:50;
}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{border-color:var(--brand-600);color:var(--brand-600)}

/* roulang page: category3 */
:root{
  --brand-600:#2C6FD1;
  --brand-700:#1E4F9C;
  --brand-050:#EDF3FD;
  --sun-500:#E39B3C;
  --mist-400:#5BB8AE;
  --ink-900:#16202B;
  --ink-600:#4C5C6E;
  --ink-400:#8494A6;
  --line:#E4E9F2;
  --bg:#F6F8FB;
  --card:#FFFFFF;
  --danger:#D64545;
  --radius-lg:16px;
  --radius-md:12px;
  --radius-sm:10px;
  --shadow-card:0 1px 2px rgba(22,44,80,.06), 0 12px 32px -12px rgba(22,44,80,.18);
  --shadow-hover:0 2px 6px rgba(22,44,80,.08), 0 22px 44px -16px rgba(22,44,80,.26);
  --ease:cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
.page-body{
  font-family:'PingFang SC','Microsoft YaHei','Noto Sans SC',system-ui,-apple-system,'Segoe UI',sans-serif;
  background:var(--bg);
  color:var(--ink-600);
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
}
.page-body img{display:block;max-width:100%;height:auto;}
.page-body a{color:inherit;text-decoration:none;}
.page-body ul,.page-body ol{list-style:none;}
.page-body button{font-family:inherit;cursor:pointer;}
.page-body input,.page-body textarea{font-family:inherit;}
.page-body ::selection{background:rgba(44,111,209,.16);}
.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;}}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(255,255,255,.94);
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
  border-top:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:60px;}
@media (min-width:1024px){.header-inner{min-height:72px;}}
.logo{display:inline-flex;flex-direction:column;gap:3px;line-height:1;}
.logo-mark{font-size:20px;font-weight:700;color:var(--ink-900);letter-spacing:.06em;}
.logo-sub{font-size:11px;letter-spacing:.14em;color:var(--ink-400);text-transform:uppercase;font-variant-numeric:tabular-nums;}
.logo-sub em{font-style:normal;color:var(--brand-600);margin-left:6px;letter-spacing:.06em;text-transform:none;}
.nav-desktop{display:none;align-items:center;gap:34px;margin-left:48px;}
@media (min-width:1024px){.nav-desktop{display:flex;}}
.nav-link{
  position:relative;display:inline-flex;align-items:center;
  padding:6px 12px 6px 0;
  font-size:15px;font-weight:500;color:var(--ink-600);
  transition:color .16s var(--ease);
}
.nav-link::after{
  content:'';position:absolute;left:0;right:12px;bottom:-2px;height:2px;
  background:var(--brand-600);transform:scaleX(0);transform-origin:left;
  transition:transform .16s var(--ease);
}
.nav-link::before{
  content:'';position:absolute;right:0;top:50%;width:4px;height:4px;border-radius:50%;
  background:var(--brand-600);transform:translateY(-50%);opacity:0;
  transition:opacity .16s var(--ease);
}
.nav-link:hover{color:var(--brand-600);}
.nav-link:hover::after{transform:scaleX(1);}
.nav-link.active{color:var(--brand-600);}
.nav-link.active::after{transform:scaleX(1);}
.nav-link.active::before{opacity:1;}
.header-actions{display:flex;align-items:center;gap:14px;}
.nav-toggle{
  display:inline-flex;flex-direction:column;justify-content:center;gap:5px;
  width:40px;height:40px;padding:0 9px;border:1px solid var(--line);border-radius:12px;
  background:#fff;transition:border-color .16s var(--ease);
}
.nav-toggle span{display:block;height:1.5px;background:var(--ink-900);border-radius:2px;transition:background .16s;}
.nav-toggle:hover{border-color:var(--brand-600);}
.nav-toggle:hover span{background:var(--brand-600);}
@media (min-width:1024px){.nav-toggle{display:none;}}
.mobile-drawer{display:none;border-top:1px solid var(--line);background:#fff;box-shadow:0 18px 32px -22px rgba(22,44,80,.32);}
.mobile-drawer.open{display:block;}
.mobile-drawer a{
  display:flex;align-items:center;min-height:52px;
  font-size:15px;color:var(--ink-600);border-bottom:1px solid var(--line);
  padding-left:0;transition:color .16s var(--ease);
}
.mobile-drawer a:hover{color:var(--brand-600);}
.mobile-drawer a.active{color:var(--brand-600);font-weight:600;border-left:2px solid var(--brand-600);padding-left:12px;}
.mobile-drawer .drawer-cta{
  justify-content:center;margin:18px 0 22px;border-bottom:0;padding-left:0;
  color:#fff;font-weight:500;
}
.mobile-drawer .drawer-cta:hover{color:#fff;}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border-radius:999px;border:1px solid transparent;
  font-size:15px;font-weight:500;line-height:1;
  padding:13px 24px;transition:all .2s var(--ease);
  white-space:nowrap;
}
.btn-primary{background:var(--brand-600);color:#fff;}
.btn-primary:hover{background:var(--brand-700);box-shadow:0 12px 26px -12px rgba(30,79,156,.75);transform:translateY(-1px);}
.btn-secondary{background:#fff;color:var(--brand-600);border-color:var(--brand-600);}
.btn-secondary:hover{background:var(--brand-050);box-shadow:0 10px 24px -16px rgba(44,111,209,.6);transform:translateY(-1px);}
.btn-sm{padding:10px 18px;font-size:14px;}
.btn:focus-visible{outline:2px solid rgba(44,111,209,.4);outline-offset:2px;}
.link-arrow{display:inline-flex;align-items:center;gap:6px;color:var(--brand-600);font-weight:500;font-size:14.5px;}
.link-arrow::after{content:'→';transition:transform .16s var(--ease);}
.link-arrow:hover{color:var(--brand-700);}
.link-arrow:hover::after{transform:translateX(2px);}
.link-arrow:focus-visible{outline:2px solid rgba(44,111,209,.4);outline-offset:3px;border-radius:4px;}

/* ---------- page hero ---------- */
.page-hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line);background:#fff;padding:48px 0 44px;}
.page-hero::before{
  content:'';position:absolute;inset:0;
  background-image:url('/assets/images/backpic/back-2.webp');
  background-size:cover;background-position:center;opacity:.09;
}
.page-hero::after{
  content:'';position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(255,255,255,.7) 0%,rgba(255,255,255,.94) 62%,#ffffff 100%);
}
.page-hero-inner{position:relative;z-index:2;display:grid;gap:32px;}
@media (min-width:1024px){
  .page-hero{padding:72px 0 56px;}
  .page-hero-inner{grid-template-columns:minmax(0,1fr) 340px;align-items:end;gap:56px;}
}
.crumb{font-size:13px;color:var(--ink-400);margin-bottom:18px;}
.crumb a{transition:color .16s;}
.crumb a:hover{color:var(--brand-600);}
.crumb span{color:var(--ink-900);}
.crumb i{font-style:normal;margin:0 8px;color:var(--line);}
.eyebrow{
  display:inline-block;padding:4px 10px;border-radius:999px;
  background:var(--brand-050);color:var(--brand-700);
  font-size:12px;letter-spacing:.1em;margin-bottom:14px;
}
.hero-title{
  font-size:clamp(28px,4.4vw,44px);line-height:1.25;font-weight:700;
  color:var(--ink-900);letter-spacing:.01em;
}
.hero-sub{margin-top:16px;font-size:16.5px;line-height:1.8;color:var(--ink-600);max-width:620px;}
.hero-stats{
  background:rgba(255,255,255,.86);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:6px 20px;box-shadow:var(--shadow-card);
}
.stat{display:flex;align-items:baseline;justify-content:space-between;gap:16px;padding:13px 0;border-bottom:1px solid var(--line);font-variant-numeric:tabular-nums;}
.stat:last-child{border-bottom:0;}
.stat-label{font-size:13px;color:var(--ink-400);letter-spacing:.04em;}
.stat-value{font-size:15px;font-weight:600;color:var(--ink-900);}

/* ---------- sections ---------- */
.section{padding:56px 0;}
@media (min-width:1024px){.section{padding:84px 0;}}
.section-head{max-width:720px;margin-bottom:36px;}
.section-title{font-size:clamp(22px,3vw,32px);line-height:1.35;font-weight:600;color:var(--ink-900);}
.section-desc{margin-top:12px;font-size:15.5px;line-height:1.8;color:var(--ink-600);}

/* ---------- spotlight ---------- */
.spotlight{display:grid;gap:22px;}
@media (min-width:1024px){.spotlight{grid-template-columns:minmax(0,3fr) minmax(0,2fr);}}
.spotlight-side{display:grid;gap:22px;}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius-lg);
  box-shadow:var(--shadow-card);overflow:hidden;
  transition:transform .2s var(--ease),box-shadow .2s var(--ease),border-color .2s var(--ease);
}
.card:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover);border-color:rgba(44,111,209,.2);}
.card-media{aspect-ratio:16/9;overflow:hidden;border-bottom:1px solid var(--line);}
.card-media img{width:100%;height:100%;object-fit:cover;transition:transform .4s var(--ease);}
.card:hover .card-media img{transform:scale(1.03);}
.card-body{padding:24px;}
@media (min-width:1024px){.card-body{padding:28px;}}
.card-title{font-size:19px;font-weight:600;color:var(--ink-900);line-height:1.5;}
.card-text{margin-top:12px;font-size:15px;line-height:1.85;color:var(--ink-600);}
.check-list{margin-top:20px;}
.check-list li{
  display:flex;gap:12px;align-items:flex-start;
  padding:13px 0;border-top:1px solid var(--line);
  font-size:14.5px;line-height:1.75;color:var(--ink-600);
}
.check-list li:last-child{padding-bottom:0;}
.check-list .dot{flex:0 0 8px;width:8px;height:8px;border-radius:50%;background:var(--mist-400);margin-top:9px;}
.check-list .dot.gold{background:var(--sun-500);}
.mini-card .card-body{padding:24px;display:flex;flex-direction:column;height:100%;}
.mini-icon{
  width:40px;height:40px;border-radius:12px;background:var(--brand-050);
  display:inline-flex;align-items:center;justify-content:center;margin-bottom:16px;
}
.mini-icon svg{width:20px;height:20px;stroke:var(--brand-600);fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;}
.mini-card .link-arrow{margin-top:18px;}

/* ---------- dark band ---------- */
.dark-band{
  position:relative;overflow:hidden;border-radius:24px;
  background:var(--ink-900);color:#fff;padding:40px 26px;
}
@media (min-width:1024px){.dark-band{padding:56px 48px;}}
.dark-band::before{
  content:'';position:absolute;inset:0;
  background-image:url('/assets/images/coverpic/cover-7.webp');
  background-size:cover;background-position:center;opacity:.15;
}
.dark-band::after{
  content:'';position:absolute;inset:0;
  background:linear-gradient(120deg,rgba(22,32,43,.9),rgba(22,32,43,.6));
}
.dark-band > *{position:relative;z-index:2;}
.band-head{max-width:640px;margin-bottom:32px;}
.band-head .section-title{color:#fff;}
.band-head .section-desc{color:rgba(255,255,255,.68);}
.band-grid{display:grid;gap:28px;}
@media (min-width:1024px){
  .band-grid{grid-template-columns:repeat(3,1fr);gap:0;}
  .band-item{padding:0 32px;border-left:1px solid rgba(255,255,255,.14);}
  .band-item:first-child{border-left:0;padding-left:0;}
}
.band-num{font-size:13px;letter-spacing:.14em;color:var(--sun-500);font-variant-numeric:tabular-nums;}
.band-title{margin-top:10px;font-size:18px;font-weight:600;color:#fff;line-height:1.5;}
.band-text{margin-top:10px;font-size:14.5px;line-height:1.85;color:rgba(255,255,255,.72);}

/* ---------- accordion ---------- */
.acc-grid{display:grid;gap:0;}
@media (min-width:1024px){.acc-grid{grid-template-columns:1fr 1fr;column-gap:48px;}}
.acc-item{border-bottom:1px solid var(--line);}
.acc-item:first-child{border-top:1px solid var(--line);}
.acc-head{
  width:100%;background:none;border:0;
  display:flex;align-items:center;justify-content:space-between;gap:18px;
  padding:20px 0;text-align:left;
  font-size:16.5px;font-weight:500;color:var(--ink-900);line-height:1.6;
  transition:color .18s var(--ease);
}
.acc-head:hover{color:var(--brand-600);}
.acc-head:focus-visible{outline:2px solid rgba(44,111,209,.4);outline-offset:3px;border-radius:6px;}
.acc-item.open .acc-head{color:var(--brand-600);}
.acc-icon{position:relative;flex:0 0 16px;width:16px;height:16px;color:inherit;}
.acc-icon::before,.acc-icon::after{content:'';position:absolute;background:currentColor;transition:transform .2s var(--ease),opacity .2s var(--ease);}
.acc-icon::before{left:0;right:0;top:7.2px;height:1.6px;}
.acc-icon::after{top:0;bottom:0;left:7.2px;width:1.6px;}
.acc-item.open .acc-icon::after{transform:scaleY(0);opacity:0;}
.acc-panel{max-height:0;overflow:hidden;transition:max-height .2s ease-out;}
.acc-body{padding:0 34px 22px 0;font-size:15px;line-height:1.85;color:var(--ink-600);}

/* ---------- cta band ---------- */
.cta-wrap{padding:8px 0 72px;}
@media (min-width:1024px){.cta-wrap{padding:8px 0 96px;}}
.cta-band{
  background:var(--brand-050);border:1px solid #dbe7fa;border-radius:20px;
  padding:32px 26px;display:flex;flex-direction:column;gap:22px;
}
@media (min-width:1024px){.cta-band{flex-direction:row;align-items:center;justify-content:space-between;padding:38px 44px;gap:40px;}}
.cta-copy h2{font-size:20px;font-weight:600;color:var(--ink-900);line-height:1.5;}
.cta-copy p{margin-top:10px;font-size:14.5px;line-height:1.8;color:var(--ink-600);max-width:640px;}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px;}

/* ---------- footer ---------- */
.site-footer{background:#fff;border-top:1px solid var(--line);padding:56px 0 28px;}
.footer-grid{display:grid;gap:36px;}
@media (min-width:768px){.footer-grid{grid-template-columns:1fr 1fr;gap:40px;}}
@media (min-width:1024px){.footer-grid{grid-template-columns:1.5fr 1fr 1fr 1.4fr;gap:48px;}}
.footer-brand .logo{margin-bottom:18px;}
.footer-desc{font-size:14px;line-height:1.85;color:var(--ink-400);max-width:340px;}
.footer-title{font-size:13px;letter-spacing:.1em;color:var(--ink-900);font-weight:600;margin-bottom:16px;}
.footer-links li{margin-bottom:12px;}
.footer-links a{font-size:14px;color:var(--ink-600);transition:color .16s var(--ease);}
.footer-links a:hover{color:var(--brand-600);}
.footer-note{font-size:13.5px;line-height:1.9;color:var(--ink-400);}
.footer-bottom{
  margin-top:44px;padding-top:20px;border-top:1px solid var(--line);
  display:flex;flex-direction:column;gap:8px;
  font-size:13px;color:var(--ink-400);
}
@media (min-width:768px){.footer-bottom{flex-direction:row;align-items:center;justify-content:space-between;}}

/* ---------- to top ---------- */
.to-top{
  position:fixed;right:20px;bottom:24px;z-index:70;
  width:42px;height:42px;border-radius:50%;
  display:inline-flex;align-items:center;justify-content:center;
  background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-card);
  color:var(--ink-600);opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s;
}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0);}
.to-top:hover{color:var(--brand-600);border-color:rgba(44,111,209,.4);}
.to-top:focus-visible{outline:2px solid rgba(44,111,209,.4);outline-offset:2px;}
.to-top svg{width:16px;height:16px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;}

@media (max-width:520px){
  .hero-title{font-size:26px;}
  .hero-sub{font-size:15.5px;}
  .card-body{padding:20px;}
  .acc-head{font-size:15.5px;}
  .acc-body{padding-right:8px;}
  .cta-band{padding:26px 20px;}
  .btn{padding:12px 20px;font-size:14.5px;}
}