/* roulang page: index */
:root{
  --brand-600:#1F4FD8;
  --brand-700:#1A42B4;
  --brand-500:#3A6BE8;
  --brand-50:#EEF3FE;
  --accent-500:#FF6B2C;
  --accent-50:#FFF1E9;
  --ink-900:#0E1524;
  --ink-700:#33405A;
  --ink-500:#64708A;
  --line:#E6EAF2;
  --bg:#F7F9FC;
  --surface:#FFFFFF;
  --ok:#0E9F6E;
  --warn:#B45309;
  --err:#D14343;
  --r-sm:8px;
  --r-md:12px;
  --r-lg:20px;
  --r-pill:999px;
  --sh-1:0 1px 2px rgba(16,24,40,.05);
  --sh-2:0 8px 24px -8px rgba(20,40,100,.12);
  --sh-3:0 18px 40px -12px rgba(20,40,100,.18);
  --container:1200px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:-apple-system,"PingFang SC","Microsoft YaHei","Source Han Sans SC",sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--ink-700);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul,ol{margin:0;padding:0;list-style:none}
button,input,select,textarea{font:inherit;color:inherit}
h1,h2,h3,h4{margin:0;color:var(--ink-900);font-weight:700;line-height:1.3}
h1{font-size:clamp(30px,4vw,46px);line-height:1.2}
h2{font-size:clamp(24px,2.6vw,32px);line-height:1.3}
h3{font-size:20px;line-height:1.4;font-weight:600}
p{margin:0}
:focus-visible{outline:2px solid var(--brand-500);outline-offset:2px;border-radius:6px}
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px}
.section{padding:96px 0}
.section-tight{padding:0 0 96px}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:40px;flex-wrap:wrap}
.section-sub{font-size:15px;line-height:1.8;color:var(--ink-500);margin-top:10px;max-width:660px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--brand-600);letter-spacing:.04em;margin-bottom:12px}
.eyebrow::before{content:"";width:2px;height:14px;background:var(--brand-600);border-radius:2px}
.link-arrow{display:inline-flex;align-items:center;gap:6px;color:var(--brand-600);font-weight:600;font-size:15px;white-space:nowrap}
.link-arrow::after{content:"→";transition:transform .2s ease}
.link-arrow:hover::after{transform:translateX(2px)}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.97);backdrop-filter:saturate(180%) blur(8px);border-bottom:1px solid var(--line);transition:box-shadow .2s ease}
.site-header.scrolled{box-shadow:var(--sh-1)}
.nav-inner{display:flex;align-items:center;gap:16px;height:72px}
.brand{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:700;color:var(--ink-900);flex-shrink:0}
.brand-mark{width:28px;height:28px;border-radius:8px;background:linear-gradient(135deg,var(--brand-600),var(--brand-500));display:grid;place-items:center;color:#fff;font-size:13px;font-weight:700;letter-spacing:-.02em}
.main-nav{display:flex;align-items:center;gap:2px;margin-left:auto}
.nav-item{position:relative}
.nav-link{display:inline-flex;align-items:center;gap:6px;padding:10px 14px;font-size:15px;font-weight:500;color:var(--ink-700);border-radius:8px;transition:color .2s ease,background .2s ease}
.nav-link:hover{color:var(--brand-600);background:var(--brand-50)}
.nav-item.active > .nav-link{color:var(--brand-600);font-weight:600}
.nav-item.active > .nav-link::after{content:"";position:absolute;left:14px;right:14px;bottom:-1px;height:2px;border-radius:2px;background:var(--brand-600)}
.caret{width:8px;height:8px;border-right:1.6px solid currentColor;border-bottom:1.6px solid currentColor;transform:rotate(45deg) translateY(-2px);transition:transform .2s ease}
.nav-item.has-mega:hover .caret,.nav-item.has-mega.open .caret{transform:rotate(225deg) translateY(-1px)}
.nav-cta{margin-left:12px}
.nav-toggle{display:none;margin-left:auto;width:44px;height:44px;border:1px solid var(--line);border-radius:10px;background:#fff;align-items:center;justify-content:center;cursor:pointer}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--ink-900);border-radius:2px;position:relative}
.nav-toggle span::before,.nav-toggle span::after{content:"";position:absolute;left:0;width:18px;height:2px;background:var(--ink-900);border-radius:2px}
.nav-toggle span::before{top:-6px}
.nav-toggle span::after{top:6px}

/* ---------- Mega menu ---------- */
.mega{position:absolute;top:calc(100% + 12px);left:50%;width:820px;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--sh-3);padding:24px;z-index:120;
  opacity:0;visibility:hidden;transform:translate(-50%,4px);transition:opacity .18s ease,transform .18s ease,visibility .18s ease}
.nav-item.has-mega:hover .mega,.nav-item.has-mega:focus-within .mega,.nav-item.has-mega.open .mega{opacity:1;visibility:visible;transform:translate(-50%,0)}
.mega-grid{display:grid;grid-template-columns:1fr 1.25fr 1fr;gap:24px}
.mega-col:not(:first-child){border-left:1px solid var(--line);padding-left:24px}
.mega-title{font-size:13px;font-weight:600;color:var(--ink-500);margin-bottom:14px}
.mega-list a{display:block;padding:7px 0;font-size:15px;color:var(--ink-700);transition:color .2s ease,transform .2s ease}
.mega-list a:hover{color:var(--brand-600);transform:translateX(2px)}
.mega-post{display:flex;gap:12px;padding:8px 0;border-radius:10px;transition:background .2s ease}
.mega-post:hover{background:var(--brand-50)}
.mega-thumb{width:64px;height:48px;flex:0 0 64px;border-radius:8px;overflow:hidden;background:var(--brand-50)}
.mega-thumb img{width:100%;height:100%;object-fit:cover}
.mega-post-title{font-size:14px;font-weight:600;color:var(--ink-900);line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.mega-post-time{font-size:12px;color:var(--ink-500);margin-top:4px}
.mega-entry{background:var(--brand-50);border-radius:12px;padding:18px}
.mega-entry strong{display:block;font-size:15px;color:var(--ink-900);margin-bottom:6px}
.mega-entry p{font-size:13px;line-height:1.7;color:var(--ink-500);margin-bottom:12px}

/* ---------- Drawer ---------- */
.drawer{position:fixed;left:0;right:0;top:72px;bottom:0;background:#fff;z-index:90;padding:16px 24px 40px;overflow-y:auto;
  opacity:0;visibility:hidden;transform:translateY(-8px);transition:opacity .2s ease,transform .2s ease,visibility .2s ease}
.drawer.open{opacity:1;visibility:visible;transform:translateY(0)}
.drawer a.drawer-link{display:block;padding:15px 2px;border-bottom:1px solid var(--line);font-size:16px;font-weight:500;color:var(--ink-900)}
.drawer a.drawer-link.active{color:var(--brand-600)}
.drawer .btn{margin-top:24px}

/* ---------- Hero ---------- */
.hero{padding:64px 0 88px;background:linear-gradient(180deg,var(--brand-50) 0%,rgba(238,243,254,0) 100%)}
.hero-grid{display:grid;grid-template-columns:7fr 5fr;gap:48px;align-items:center}
.hero-copy h1{margin-bottom:18px}
.hero-copy .lead{font-size:17px;line-height:1.85;color:var(--ink-700);max-width:560px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.trust-list{display:flex;flex-wrap:wrap;gap:14px 22px;margin-top:28px}
.trust-item{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--ink-500)}
.trust-dot{width:6px;height:6px;border-radius:50%;background:var(--brand-500);flex:0 0 6px}
.hero-media{position:relative;border-radius:var(--r-lg)}
.hero-frame{border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--sh-2);aspect-ratio:4/3;background:var(--brand-50)}
.hero-frame img{width:100%;height:100%;object-fit:cover}
.float-card{position:absolute;left:-18px;bottom:24px;display:flex;align-items:center;gap:14px;background:#fff;border-radius:14px;box-shadow:var(--sh-3);padding:14px 18px;max-width:260px}
.float-num{font-size:30px;font-weight:700;line-height:1;color:var(--accent-500)}
.float-text{font-size:13px;line-height:1.55;color:var(--ink-500)}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:44px;padding:0 20px;border-radius:10px;border:1px solid transparent;
  font-size:15px;font-weight:600;cursor:pointer;transition:transform .2s ease,background .2s ease,color .2s ease,border-color .2s ease,box-shadow .2s ease}
.btn-primary{background:var(--brand-600);color:#fff}
.btn-primary:hover{background:var(--brand-700);transform:translateY(-1px)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--ink-900)}
.btn-ghost:hover{border-color:var(--brand-500);color:var(--brand-600)}
.btn-block{width:100%}
.btn:disabled{opacity:.55;cursor:not-allowed}

/* ---------- Cards ---------- */
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);box-shadow:var(--sh-2);overflow:hidden;transition:box-shadow .2s ease,transform .2s ease}
.card:hover{box-shadow:var(--sh-3);transform:translateY(-2px)}
.badge{display:inline-flex;align-items:center;height:26px;padding:0 10px;border-radius:var(--r-pill);background:var(--brand-50);color:var(--brand-600);font-size:13px;font-weight:500}
.badge-accent{background:var(--accent-50);color:var(--accent-500)}

/* ---------- Service entries ---------- */
.service-layout{display:grid;grid-template-columns:1.15fr 1fr;gap:24px;align-items:stretch}
.service-major{display:flex;flex-direction:column}
.service-major .thumb{aspect-ratio:16/9;overflow:hidden;background:var(--brand-50)}
.service-major .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .35s ease}
.service-major:hover .thumb img{transform:scale(1.03)}
.service-major .body{padding:26px;display:flex;flex-direction:column;gap:12px;flex:1}
.service-major p{font-size:15px;line-height:1.8;color:var(--ink-700)}
.service-side{display:grid;gap:24px}
.service-mini{padding:24px;display:flex;flex-direction:column;gap:10px}
.service-mini h3{font-size:18px}
.service-mini p{font-size:14px;line-height:1.75;color:var(--ink-500)}
.mini-icon{width:38px;height:38px;border-radius:10px;background:var(--brand-50);color:var(--brand-600);display:grid;place-items:center;font-weight:700;font-size:14px}

/* ---------- Stats ---------- */
.stats-band{background:var(--surface);border:1px solid var(--line);border-radius:16px;box-shadow:var(--sh-2);display:grid;grid-template-columns:repeat(4,1fr);padding:30px 12px}
.stat{text-align:center;padding:6px 16px}
.stat + .stat{border-left:1px solid var(--line)}
.stat-num{font-size:32px;font-weight:700;line-height:1.2;color:var(--brand-600);font-family:Inter,system-ui,-apple-system,sans-serif}
.stat-num.accent{color:var(--accent-500)}
.stat-label{font-size:14px;color:var(--ink-500);margin-top:8px}

/* ---------- Scenarios ---------- */
.case-layout{display:grid;grid-template-columns:1.6fr 1fr;gap:24px}
.case-side{display:grid;gap:24px}
.case-main .thumb{aspect-ratio:16/9;overflow:hidden;background:var(--brand-50)}
.case-main .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .35s ease}
.case-main:hover .thumb img{transform:scale(1.03)}
.case-main .body{padding:26px}
.case-main h3{margin:12px 0 10px}
.case-main p{font-size:15px;line-height:1.8;color:var(--ink-700)}
.case-mini{display:flex;gap:16px;padding:20px;align-items:center}
.case-mini .thumb{width:96px;height:72px;flex:0 0 96px;border-radius:10px;overflow:hidden;background:var(--brand-50)}
.case-mini .thumb img{width:100%;height:100%;object-fit:cover}
.case-mini h3{font-size:16px;margin-bottom:6px}
.case-mini p{font-size:13px;line-height:1.7;color:var(--ink-500)}

/* ---------- Flow ---------- */
.flow-row{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.flow-row + .flow-row{margin-top:64px}
.flow-row.reverse .flow-media{order:2}
.flow-media{border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--sh-2);aspect-ratio:3/2;background:var(--brand-50)}
.flow-media img{width:100%;height:100%;object-fit:cover}
.flow-body h3{font-size:22px;margin-bottom:12px}
.flow-body p{font-size:15px;line-height:1.85;color:var(--ink-700)}
.flow-list{margin-top:18px;display:grid;gap:10px}
.flow-list li{display:flex;gap:12px;font-size:14px;line-height:1.7;color:var(--ink-700)}
.flow-index{flex:0 0 22px;height:22px;border-radius:50%;background:var(--brand-50);color:var(--brand-600);font-size:12px;font-weight:700;display:grid;place-items:center;margin-top:3px}

/* ---------- News ---------- */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.news-card{display:flex;flex-direction:column}
.news-cover{position:relative;display:block;aspect-ratio:3/2;overflow:hidden;background:var(--brand-50)}
.news-cover img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease}
.news-card:hover .news-cover img{transform:scale(1.03)}
.news-badge{position:absolute;top:12px;left:12px;height:26px;padding:0 10px;border-radius:var(--r-pill);background:rgba(255,255,255,.94);color:var(--brand-600);font-size:13px;font-weight:500;display:inline-flex;align-items:center;box-shadow:var(--sh-1)}
.news-body{padding:20px;display:flex;flex-direction:column;gap:10px;flex:1}
.news-body h3{font-size:17px;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;transition:color .2s ease}
.news-card:hover .news-body h3{color:var(--brand-600)}
.news-body p{font-size:14px;line-height:1.7;color:var(--ink-500);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-meta{margin-top:auto;padding-top:12px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:13px;color:var(--ink-500)}
.empty-state{border:1px dashed var(--line);border-radius:16px;background:#fff;min-height:220px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;text-align:center;padding:24px}
.empty-icon{width:42px;height:42px;border-radius:50%;background:var(--brand-50);display:grid;place-items:center;color:var(--brand-600);font-size:18px}

/* ---------- FAQ ---------- */
.faq-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px 24px}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:var(--r-md);box-shadow:var(--sh-1);overflow:hidden;transition:border-color .2s ease,box-shadow .2s ease}
.faq-item:hover{box-shadow:var(--sh-2)}
.faq-item summary{list-style:none;cursor:pointer;padding:18px 20px;font-size:16px;font-weight:600;color:var(--ink-900);display:flex;align-items:flex-start;justify-content:space-between;gap:16px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";color:var(--brand-600);font-size:20px;line-height:1;font-weight:600}
.faq-item[open]{border-left:3px solid var(--brand-600)}
.faq-item[open] summary::after{content:"−"}
.faq-body{padding:0 20px 18px;font-size:15px;line-height:1.8;color:var(--ink-700)}

/* ---------- Contact ---------- */
.contact-layout{display:grid;grid-template-columns:7fr 5fr;gap:24px;align-items:start}
.form-card{padding:28px}
.field{margin-bottom:16px}
.field label{display:block;font-size:13px;font-weight:600;color:var(--ink-900);margin-bottom:8px}
.input{width:100%;height:46px;padding:0 14px;border:1px solid var(--line);border-radius:10px;background:#fff;transition:border-color .2s ease,box-shadow .2s ease}
textarea.input{height:auto;min-height:120px;padding:12px 14px;resize:vertical;line-height:1.7}
.input:focus{outline:none;border-color:var(--brand-500);box-shadow:0 0 0 3px var(--brand-50)}
.input.is-error{border-color:var(--err)}
.field-error{display:none;font-size:13px;color:var(--err);margin-top:6px}
.form-tip{font-size:13px;color:var(--ink-500);margin-top:14px;line-height:1.7}
.form-tip.is-ok{color:var(--ok)}
.info-card{padding:26px;display:grid;gap:18px}
.info-row{display:flex;gap:14px}
.info-icon{width:36px;height:36px;flex:0 0 36px;border-radius:10px;background:var(--brand-50);color:var(--brand-600);display:grid;place-items:center;font-size:13px;font-weight:700}
.info-row strong{display:block;font-size:15px;color:var(--ink-900);margin-bottom:4px}
.info-row p{font-size:14px;line-height:1.75;color:var(--ink-500)}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink-900);color:rgba(255,255,255,.72);padding:64px 0 0;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:32px}
.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-size:18px;font-weight:700;margin-bottom:14px}
.footer-brand .brand-mark{background:linear-gradient(135deg,var(--brand-500),var(--brand-600))}
.footer-desc{font-size:14px;line-height:1.8;color:rgba(255,255,255,.6);max-width:320px}
.footer-title{color:#fff;font-size:15px;font-weight:600;margin-bottom:16px}
.footer-link{display:block;padding:6px 0;font-size:14px;color:rgba(255,255,255,.72);transition:color .2s ease}
.footer-link:hover{color:var(--brand-500)}
.footer-bottom{margin-top:48px;border-top:1px solid rgba(255,255,255,.12);padding:20px 0;font-size:13px;color:rgba(255,255,255,.55);display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}

/* ---------- Responsive ---------- */
@media (max-width:1279px){
  .hero-grid{grid-template-columns:6fr 6fr;gap:36px}
  .news-grid{grid-template-columns:repeat(2,1fr)}
  .mega{width:700px}
}
@media (max-width:1023px){
  .section{padding:72px 0}
  .section-tight{padding:0 0 72px}
  .main-nav{display:none}
  .nav-cta{display:none}
  .nav-toggle{display:inline-flex}
  .hero{padding:48px 0 64px}
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .hero-copy .lead{max-width:100%}
  .service-layout{grid-template-columns:1fr}
  .case-layout{grid-template-columns:1fr}
  .case-side{grid-template-columns:1fr 1fr}
  .flow-row{grid-template-columns:1fr;gap:24px}
  .flow-row.reverse .flow-media{order:0}
  .flow-row + .flow-row{margin-top:48px}
  .faq-grid{grid-template-columns:1fr}
  .contact-layout{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
}
@media (max-width:767px){
  .container{padding:0 16px}
  .section{padding:48px 0}
  .section-tight{padding:0 0 48px}
  .section-head{margin-bottom:28px}
  h1{font-size:28px}
  h2{font-size:23px}
  .stats-band{grid-template-columns:1fr 1fr;padding:20px 8px;gap:12px 0}
  .stat{padding:10px 8px}
  .stat + .stat{border-left:0}
  .stat:nth-child(odd){border-right:1px solid var(--line)}
  .news-grid{grid-template-columns:1fr}
  .case-side{grid-template-columns:1fr}
  .float-card{left:12px;bottom:14px;padding:12px 14px;max-width:220px}
  .float-num{font-size:24px}
  .form-card,.service-mini,.info-card{padding:20px}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{justify-content:flex-start}
}
@media (max-width:480px){
  .card{padding:0}
  .service-mini,.info-card,.form-card{padding:16px}
  .hero-actions .btn{width:100%}
  .news-body{padding:16px}
  .case-mini{flex-direction:column;align-items:flex-start}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important}
  html{scroll-behavior:auto}
}

/* roulang page: article */
:root{
  --brand-600:#1F4FD8;
  --brand-700:#1A42B4;
  --brand-500:#3A6BE8;
  --brand-50:#EEF3FE;
  --accent-500:#FF6B2C;
  --accent-50:#FFF1E9;
  --ink-900:#0E1524;
  --ink-700:#33405A;
  --ink-500:#64708A;
  --line:#E6EAF2;
  --bg:#F7F9FC;
  --surface:#FFFFFF;
  --ok:#0E9F6E;
  --warn:#B45309;
  --err:#D14343;
  --sh-1:0 1px 2px rgba(16,24,40,.05);
  --sh-2:0 8px 24px -8px rgba(20,40,100,.12);
  --sh-3:0 18px 40px -12px rgba(20,40,100,.18);
  --r-s:8px;
  --r-m:12px;
  --r-l:16px;
  --r-xl:20px;
  --r-pill:999px;
  --container:1200px;
  --t:200ms ease;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;
  font-family:-apple-system,"PingFang SC","Microsoft YaHei","Source Han Sans SC",sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--ink-700);
  background:var(--bg);
  overflow-x:hidden;
}
img{max-width:100%;display:block;border-style:none;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
input,textarea,select{font:inherit;}
h1,h2,h3,h4,p,ul,ol,figure{margin:0;}
ul,ol{padding:0;list-style:none;}
:focus-visible{outline:2px solid var(--brand-500);outline-offset:2px;border-radius:6px;}
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px;}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(255,255,255,.96);
  border-bottom:1px solid var(--line);
  backdrop-filter:saturate(160%) blur(8px);
  transition:box-shadow var(--t);
}
.site-header.is-scrolled{box-shadow:var(--sh-2);}
.nav-inner{display:flex;align-items:center;gap:20px;min-height:72px;}
.brand{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:700;color:var(--ink-900);letter-spacing:.2px;}
.brand-mark{
  width:28px;height:28px;border-radius:9px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--brand-600),var(--brand-500));
  color:#fff;font-size:15px;font-weight:700;
}
.main-nav{display:flex;align-items:center;gap:4px;margin-left:auto;}
.nav-item{position:relative;}
.nav-link{
  display:inline-flex;align-items:center;gap:6px;
  padding:10px 14px;border-radius:10px;
  font-size:15px;font-weight:500;color:var(--ink-700);
  transition:color var(--t),background var(--t);
}
.nav-link:hover{color:var(--brand-600);background:var(--brand-50);}
.nav-item.active .nav-link{color:var(--brand-600);}
.nav-item.active .nav-link::after{
  content:"";position:absolute;left:14px;right:14px;bottom:2px;height:2px;border-radius:2px;background:var(--brand-600);
}
.caret{width:6px;height:6px;border-right:1.6px solid currentColor;border-bottom:1.6px solid currentColor;transform:rotate(45deg) translateY(-2px);opacity:.7;}
.mega{
  position:absolute;top:calc(100% + 12px);left:50%;transform:translate(-50%,-4px);
  width:780px;padding:24px;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--sh-3);
  opacity:0;visibility:hidden;transition:opacity 180ms ease,transform 180ms ease,visibility 180ms;z-index:90;
}
.nav-item.has-mega:hover .mega,.nav-item.has-mega:focus-within .mega{opacity:1;visibility:visible;transform:translate(-50%,0);}
.mega-grid{display:grid;grid-template-columns:.9fr 1.4fr 1fr;gap:24px;}
.mega-col + .mega-col{border-left:1px solid var(--line);padding-left:24px;}
.mega-title{font-size:13px;font-weight:600;letter-spacing:.4px;color:var(--ink-500);margin-bottom:12px;}
.mega-list{display:flex;flex-direction:column;gap:4px;}
.mega-list a{
  display:block;padding:8px 10px;border-radius:8px;font-size:14px;color:var(--ink-700);
  transition:color var(--t),background var(--t),transform var(--t);
}
.mega-list a:hover{color:var(--brand-600);background:var(--brand-50);transform:translateX(2px);}
.mega-post{display:flex;gap:12px;padding:8px;border-radius:12px;transition:background var(--t);}
.mega-post:hover{background:var(--bg);}
.mega-thumb{flex:0 0 64px;height:48px;border-radius:8px;overflow:hidden;background:var(--brand-50);}
.mega-thumb img{width:100%;height:100%;object-fit:cover;}
.mega-post-title{display:block;font-size:14px;font-weight:600;color:var(--ink-900);line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.mega-post-time{display:block;margin-top:4px;font-size:12px;color:var(--ink-500);}
.mega-card{
  display:block;padding:18px;border-radius:12px;background:var(--brand-50);
  transition:background var(--t),transform var(--t);
}
.mega-card:hover{background:#E4ECFE;transform:translateY(-2px);}
.mega-card strong{display:block;font-size:15px;color:var(--ink-900);margin-bottom:6px;}
.mega-card span{font-size:13px;color:var(--ink-500);line-height:1.6;}
.mega-card em{display:inline-block;margin-top:10px;font-style:normal;font-size:13px;font-weight:600;color:var(--brand-600);}
.nav-actions{display:flex;align-items:center;gap:10px;}
.nav-toggle{
  display:none;width:42px;height:42px;border-radius:10px;border:1px solid var(--line);
  align-items:center;justify-content:center;flex-direction:column;gap:4px;background:#fff;
}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--ink-900);border-radius:2px;transition:transform var(--t),opacity var(--t);}
body.nav-open .nav-toggle span:nth-child(1){transform:translateY(6px) rotate(45deg);}
body.nav-open .nav-toggle span:nth-child(2){opacity:0;}
body.nav-open .nav-toggle span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}
.mobile-nav{display:none;border-top:1px solid var(--line);background:#fff;padding:12px 24px 20px;box-shadow:var(--sh-2);}
body.nav-open .mobile-nav{display:block;}
.mobile-nav a{display:block;padding:12px 4px;font-size:15px;color:var(--ink-700);border-bottom:1px solid var(--line);}
.mobile-nav a:last-child{border-bottom:0;}
.mobile-nav a:hover{color:var(--brand-600);}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 20px;border-radius:10px;font-size:15px;font-weight:600;
  transition:background var(--t),color var(--t),border-color var(--t),transform var(--t),box-shadow var(--t);
  white-space:nowrap;
}
.btn-primary{background:var(--brand-600);color:#fff;box-shadow:var(--sh-1);}
.btn-primary:hover{background:var(--brand-700);transform:translateY(-1px);box-shadow:var(--sh-2);}
.btn-primary:active{transform:translateY(0);}
.btn-ghost{background:#fff;color:var(--ink-900);border:1px solid var(--line);}
.btn-ghost:hover{border-color:var(--brand-500);color:var(--brand-600);transform:translateY(-1px);}
.btn-sm{height:38px;padding:0 16px;font-size:14px;}
.link-arrow{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--brand-600);}
.link-arrow svg{transition:transform var(--t);}
.link-arrow:hover svg{transform:translateX(2px);}

/* ---------- article head ---------- */
.article-head{
  background:linear-gradient(180deg,#F4F7FE 0%,var(--bg) 100%);
  border-bottom:1px solid var(--line);
  padding:36px 0 40px;
}
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--ink-500);margin-bottom:20px;}
.breadcrumb a{color:var(--ink-500);transition:color var(--t);}
.breadcrumb a:hover{color:var(--brand-600);}
.breadcrumb .sep{color:#C3CBDB;}
.breadcrumb .current{color:var(--ink-500);max-width:520px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.article-head h1{
  font-size:clamp(26px,3.4vw,40px);line-height:1.28;font-weight:700;color:var(--ink-900);
  max-width:920px;letter-spacing:-.2px;
}
.article-meta{display:flex;flex-wrap:wrap;align-items:center;gap:10px 14px;margin-top:18px;font-size:14px;color:var(--ink-500);}
.badge{
  display:inline-flex;align-items:center;height:26px;padding:0 12px;border-radius:var(--r-pill);
  background:var(--brand-50);color:var(--brand-600);font-size:13px;font-weight:600;
}
.meta-dot{width:3px;height:3px;border-radius:50%;background:#C3CBDB;}

/* ---------- layout ---------- */
.page-main{padding:40px 0 72px;}
.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:48px;align-items:start;}
.article-main{min-width:0;}
.article-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-l);
  box-shadow:var(--sh-2);padding:36px;
}
.prose{max-width:760px;}
.prose p{margin:0 0 20px;font-size:16px;line-height:1.9;color:var(--ink-700);}
.prose h2{
  position:relative;padding-left:14px;margin:44px 0 16px;
  font-size:clamp(20px,2.2vw,24px);line-height:1.35;font-weight:700;color:var(--ink-900);
}
.prose h2::before{content:"";position:absolute;left:0;top:7px;bottom:7px;width:4px;border-radius:2px;background:var(--brand-600);}
.prose h3{margin:28px 0 12px;font-size:20px;line-height:1.4;font-weight:600;color:var(--ink-900);}
.prose h4{margin:22px 0 10px;font-size:16px;font-weight:600;color:var(--ink-900);}
.prose ul,.prose ol{margin:0 0 20px;padding-left:22px;}
.prose ul li,.prose ol li{position:relative;margin-bottom:10px;font-size:16px;line-height:1.85;color:var(--ink-700);}
.prose ul li::before{content:"";position:absolute;left:-16px;top:11px;width:6px;height:6px;border-radius:50%;background:var(--brand-500);}
.prose ol{list-style:decimal;}
.prose ol li{padding-left:4px;}
.prose blockquote{
  margin:24px 0;padding:16px 20px;border-left:3px solid var(--brand-600);
  background:var(--brand-50);border-radius:0 12px 12px 0;color:var(--ink-700);
}
.prose blockquote p{margin:0;font-size:15px;line-height:1.85;}
.prose img{border-radius:12px;box-shadow:var(--sh-1);margin:20px 0;}
.prose a{color:var(--brand-600);text-decoration:underline;text-underline-offset:3px;}
.prose a:hover{color:var(--brand-700);}
.prose table{width:100%;border-collapse:collapse;margin:20px 0;font-size:15px;}
.prose th{background:var(--brand-50);color:var(--ink-900);font-weight:600;text-align:left;}
.prose th,.prose td{padding:12px 14px;border:1px solid var(--line);}
.prose strong{color:var(--ink-900);font-weight:600;}
.prose hr{border:0;border-top:1px solid var(--line);margin:32px 0;}

.empty-state{
  border:1px dashed var(--line);border-radius:16px;background:var(--bg);
  padding:40px 28px;text-align:center;
}
.empty-state h2{margin:0 0 12px;font-size:22px;color:var(--ink-900);}
.empty-state p{margin:0 0 20px;font-size:15px;color:var(--ink-500);}

/* ---------- aside ---------- */
.article-aside{position:sticky;top:96px;display:flex;flex-direction:column;gap:20px;}
.aside-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-l);
  box-shadow:var(--sh-2);padding:20px;
}
.aside-title{font-size:15px;font-weight:600;color:var(--ink-900);margin-bottom:14px;padding-left:10px;position:relative;}
.aside-title::before{content:"";position:absolute;left:0;top:5px;bottom:5px;width:3px;border-radius:2px;background:var(--brand-600);}
.aside-list{display:flex;flex-direction:column;gap:12px;}
.aside-item{display:flex;gap:10px;padding:6px;border-radius:10px;transition:background var(--t);}
.aside-item:hover{background:var(--bg);}
.aside-item img{flex:0 0 56px;width:56px;height:42px;object-fit:cover;border-radius:8px;background:var(--brand-50);}
.aside-item strong{display:block;font-size:14px;font-weight:600;color:var(--ink-900);line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.aside-item span{display:block;margin-top:2px;font-size:12px;color:var(--ink-500);}
.aside-cta{background:linear-gradient(160deg,var(--brand-50),#fff);border:1px solid #DCE6FD;}
.aside-cta strong{display:block;font-size:16px;color:var(--ink-900);margin-bottom:8px;}
.aside-cta p{font-size:14px;color:var(--ink-500);line-height:1.7;margin-bottom:14px;}
.aside-cta .btn{width:100%;}

/* ---------- related & faq ---------- */
.section{margin-top:48px;}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:20px;}
.section-head h2{font-size:22px;font-weight:700;color:var(--ink-900);}
.section-head p{font-size:14px;color:var(--ink-500);margin-top:6px;}
.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;}
.rel-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-m);
  overflow:hidden;box-shadow:var(--sh-2);
  transition:transform var(--t),box-shadow var(--t);
}
.rel-card:hover{transform:translateY(-2px);box-shadow:var(--sh-3);}
.rel-thumb{position:relative;aspect-ratio:3/2;overflow:hidden;background:var(--brand-50);}
.rel-thumb img{width:100%;height:100%;object-fit:cover;transition:transform var(--t);}
.rel-card:hover .rel-thumb img{transform:scale(1.03);}
.rel-body{padding:16px;}
.rel-body h3{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;}
.rel-body p{margin-top:8px;font-size:14px;line-height:1.7;color:var(--ink-500);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.rel-meta{margin-top:12px;font-size:13px;color:var(--ink-500);}
.faq-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;}
.faq-item{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-l);
  box-shadow:var(--sh-2);overflow:hidden;
}
.faq-item summary{
  cursor:pointer;list-style:none;padding:18px 20px;font-size:16px;font-weight:600;color:var(--ink-900);
  display:flex;align-items:center;justify-content:space-between;gap:12px;
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{content:"+";font-size:20px;font-weight:500;color:var(--brand-600);line-height:1;}
.faq-item[open] summary::after{content:"−";}
.faq-item[open] summary{box-shadow:inset 3px 0 0 var(--brand-600);}
.faq-item p{padding:0 20px 18px;font-size:15px;line-height:1.8;color:var(--ink-700);}

/* ---------- back / cta ---------- */
.back-bar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;margin-top:32px;}
.cta-band{
  margin-top:48px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-xl);
  box-shadow:var(--sh-2);padding:32px;display:grid;grid-template-columns:1.5fr 1fr;gap:28px;align-items:center;
}
.cta-band h2{font-size:clamp(20px,2.2vw,26px);color:var(--ink-900);line-height:1.35;}
.cta-band p{margin-top:10px;font-size:15px;color:var(--ink-500);line-height:1.8;}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px;justify-content:flex-end;}

/* ---------- footer ---------- */
.site-footer{background:var(--ink-900);color:rgba(255,255,255,.72);padding:56px 0 24px;margin-top:72px;}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:32px;}
.footer-brand{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:700;color:#fff;margin-bottom:14px;}
.footer-desc{font-size:14px;line-height:1.8;color:rgba(255,255,255,.6);max-width:320px;}
.footer-title{font-size:15px;font-weight:600;color:#fff;margin-bottom:14px;}
.footer-link{display:block;font-size:14px;color:rgba(255,255,255,.72);padding:6px 0;transition:color var(--t);}
.footer-link:hover{color:var(--brand-500);}
.footer-bottom{
  margin-top:36px;padding-top:20px;border-top:1px solid rgba(255,255,255,.12);
  display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;font-size:13px;color:rgba(255,255,255,.55);
}

/* ---------- responsive ---------- */
@media (max-width:1279px){
  .container{max-width:1024px;}
  .mega{width:640px;}
  .mega-grid{grid-template-columns:1fr 1.3fr;}
  .mega-col.mega-col-third{display:none;}
}
@media (max-width:1023px){
  .main-nav{display:none;}
  .nav-toggle{display:inline-flex;}
  .nav-actions .btn{display:none;}
  .article-layout{grid-template-columns:1fr;gap:32px;}
  .article-aside{position:static;}
  .prose{max-width:100%;}
  .cta-band{grid-template-columns:1fr;}
  .cta-actions{justify-content:flex-start;}
}
@media (max-width:767px){
  .container{padding:0 16px;}
  .page-main{padding:28px 0 48px;}
  .article-head{padding:24px 0 28px;}
  .article-card{padding:22px;}
  .prose p{font-size:15.5px;line-height:1.85;}
  .prose h2{margin-top:32px;}
  .prose table{display:block;overflow-x:auto;white-space:nowrap;}
  .faq-list{grid-template-columns:1fr;}
  .related-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:24px;}
  .section{margin-top:36px;}
}
@media (max-width:520px){
  .related-grid{grid-template-columns:1fr;}
  .article-card{padding:18px;}
  .footer-grid{grid-template-columns:1fr;}
  .btn{width:100%;}
  .back-bar .btn,.cta-actions .btn{width:100%;}
  .article-meta{font-size:13px;}
}

/* roulang page: category1 */
/* ============ 设计令牌 ============ */
:root{
  --brand-600:#1F4FD8;
  --brand-700:#1A42B4;
  --brand-500:#3A6BE8;
  --brand-50:#EEF3FE;
  --accent-500:#FF6B2C;
  --accent-50:#FFF1E9;
  --ink-900:#0E1524;
  --ink-700:#33405A;
  --ink-500:#64708A;
  --line:#E6EAF2;
  --bg:#F7F9FC;
  --surface:#FFFFFF;
  --ok:#0E9F6E;
  --warn:#B45309;
  --err:#D14343;

  --r-sm:8px;
  --r-md:12px;
  --r-lg:16px;
  --r-xl:20px;
  --r-pill:999px;

  --sh-1:0 1px 2px rgba(16,24,40,.05);
  --sh-2:0 8px 24px -8px rgba(20,40,100,.12);
  --sh-3:0 18px 40px -12px rgba(20,40,100,.18);

  --sp-section:96px;
  --container:1200px;
  --font:"Inter",-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Source Han Sans SC","Helvetica Neue",Arial,sans-serif;
}

/* ============ 基础 reset ============ */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font);
  font-size:16px;
  line-height:1.75;
  color:var(--ink-700);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0;}
ul,ol{padding:0;list-style:none;}
img{max-width:100%;display:block;height:auto;}
a{color:var(--brand-600);text-decoration:none;transition:color .2s ease;}
a:hover{color:var(--brand-700);}
button,input,select,textarea{font:inherit;color:inherit;}
button{cursor:pointer;border:0;background:none;}
:focus-visible{outline:2px solid var(--brand-500);outline-offset:2px;border-radius:6px;}
::selection{background:var(--brand-50);color:var(--brand-700);}

/* ============ 容器与通用 ============ */
.container{
  width:100%;
  max-width:var(--container);
  margin:0 auto;
  padding:0 24px;
}
.section{padding:var(--sp-section) 0;}
.section--tight{padding:64px 0;}
.section--surface{background:var(--surface);}
.section-head{max-width:760px;margin-bottom:44px;}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center;}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;font-weight:600;letter-spacing:.04em;
  color:var(--brand-600);background:var(--brand-50);
  padding:6px 14px;border-radius:var(--r-pill);margin-bottom:16px;
}
.eyebrow::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--brand-600);}
h2.section-title{
  font-size:clamp(24px,2.6vw,32px);
  line-height:1.3;font-weight:700;color:var(--ink-900);
  letter-spacing:-.01em;
}
.section-sub{margin-top:14px;font-size:16px;color:var(--ink-500);line-height:1.8;}
.text-accent{color:var(--accent-500);}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 22px;border-radius:10px;
  font-size:15px;font-weight:600;line-height:1;
  transition:background-color .2s ease,color .2s ease,border-color .2s ease,transform .2s ease,box-shadow .2s ease;
  white-space:nowrap;
}
.btn-primary{background:var(--brand-600);color:#fff;box-shadow:0 8px 20px -10px rgba(31,79,216,.7);}
.btn-primary:hover{background:var(--brand-700);color:#fff;transform:translateY(-1px);}
.btn-primary:active{transform:translateY(0);background:var(--brand-700);}
.btn-ghost{background:var(--surface);color:var(--ink-900);border:1px solid var(--line);}
.btn-ghost:hover{border-color:var(--brand-500);color:var(--brand-600);}
.btn-accent{background:var(--accent-500);color:#fff;}
.btn-accent:hover{background:#e85c1f;color:#fff;transform:translateY(-1px);}
.btn-block{width:100%;}
.btn[disabled]{opacity:.55;cursor:not-allowed;transform:none;}
.link-arrow{
  display:inline-flex;align-items:center;gap:6px;
  font-size:15px;font-weight:600;color:var(--brand-600);
}
.link-arrow .arrow{transition:transform .2s ease;}
.link-arrow:hover .arrow{transform:translateX(2px);}

/* ============ 顶部导航 ============ */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(255,255,255,.96);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
  transition:box-shadow .25s ease;
}
.site-header.is-scrolled{box-shadow:var(--sh-1);}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:72px;gap:24px;}
.brand{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:700;color:var(--ink-900);letter-spacing:-.01em;}
.brand:hover{color:var(--ink-900);}
.brand-mark{
  width:28px;height:28px;border-radius:8px;
  display:inline-flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,var(--brand-600),var(--brand-500));
  color:#fff;font-size:14px;font-weight:700;flex:0 0 auto;
}
.main-nav{display:flex;align-items:center;gap:4px;}
.nav-item{position:relative;}
.nav-link{
  display:inline-flex;align-items:center;gap:6px;
  height:72px;padding:0 16px;
  font-size:15px;font-weight:500;color:var(--ink-700);
  position:relative;transition:color .2s ease;
}
.nav-link:hover{color:var(--brand-600);}
.nav-item.active .nav-link{color:var(--brand-600);font-weight:600;}
.nav-item.active .nav-link::after{
  content:"";position:absolute;left:16px;right:16px;bottom:0;height:2px;
  background:var(--brand-600);border-radius:2px 2px 0 0;
}
.caret{
  width:7px;height:7px;border-right:1.6px solid currentColor;border-bottom:1.6px solid currentColor;
  transform:rotate(45deg) translateY(-2px);transition:transform .2s ease;
}
.nav-item.has-mega:hover .caret,
.nav-item.has-mega:focus-within .caret{transform:rotate(225deg) translateY(-1px);}
.nav-actions{display:flex;align-items:center;gap:12px;}

/* Mega Menu */
.mega{
  position:absolute;top:calc(100% + 12px);left:50%;
  transform:translate(-50%,4px);
  width:760px;max-width:calc(100vw - 48px);
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-lg);box-shadow:var(--sh-3);
  padding:24px;opacity:0;visibility:hidden;pointer-events:none;
  transition:opacity .18s ease,transform .18s ease,visibility .18s ease;
}
.nav-item.has-mega:hover .mega,
.nav-item.has-mega:focus-within .mega{
  opacity:1;visibility:visible;pointer-events:auto;transform:translate(-50%,0);
}
.mega-grid{display:grid;grid-template-columns:1fr 1.15fr 1fr;gap:24px;}
.mega-col + .mega-col{border-left:1px solid var(--line);padding-left:24px;}
.mega-title{font-size:13px;font-weight:600;color:var(--ink-500);letter-spacing:.04em;margin-bottom:14px;}
.mega-list{display:flex;flex-direction:column;gap:4px;}
.mega-list a{
  display:block;padding:7px 10px;border-radius:var(--r-sm);
  font-size:14px;font-weight:500;color:var(--ink-700);
  transition:color .18s ease,background-color .18s ease,transform .18s ease;
}
.mega-list a:hover{color:var(--brand-600);background:var(--brand-50);transform:translateX(2px);}
.mega-post{display:flex;gap:12px;align-items:flex-start;padding:8px;border-radius:var(--r-md);transition:background-color .18s ease;}
.mega-post:hover{background:var(--brand-50);}
.mega-thumb{flex:0 0 64px;width:64px;height:48px;border-radius:var(--r-sm);overflow:hidden;background:var(--brand-50);}
.mega-thumb img{width:100%;height:100%;object-fit:cover;}
.mega-post-title{display:block;font-size:14px;font-weight:600;color:var(--ink-900);line-height:1.5;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.mega-post-time{display:block;margin-top:4px;font-size:12px;color:var(--ink-500);}
.mega-entry{
  background:var(--brand-50);border-radius:var(--r-md);padding:16px;
  display:flex;flex-direction:column;gap:8px;height:100%;
}
.mega-entry-icon{
  width:32px;height:32px;border-radius:9px;background:var(--surface);color:var(--brand-600);
  display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;box-shadow:var(--sh-1);
}
.mega-entry p{font-size:13px;line-height:1.7;color:var(--ink-500);}
.mega-entry .link-arrow{font-size:14px;}

/* 移动端菜单按钮 */
.nav-toggle{
  display:none;width:44px;height:44px;border-radius:10px;border:1px solid var(--line);
  align-items:center;justify-content:center;background:var(--surface);
}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--ink-900);border-radius:2px;position:relative;}
.nav-toggle span::before,.nav-toggle span::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:var(--ink-900);border-radius:2px;
  transition:transform .2s ease;
}
.nav-toggle span::before{top:-6px;}
.nav-toggle span::after{top:6px;}

/* 抽屉 */
.nav-drawer{
  position:fixed;inset:72px 0 0 auto;width:min(340px,86vw);
  background:var(--surface);border-left:1px solid var(--line);
  transform:translateX(100%);transition:transform .25s ease;
  z-index:90;padding:20px 20px 40px;overflow-y:auto;
}
.nav-drawer.is-open{transform:translateX(0);}
.nav-overlay{
  position:fixed;inset:72px 0 0 0;background:rgba(14,21,36,.4);
  opacity:0;visibility:hidden;transition:opacity .25s ease,visibility .25s ease;z-index:85;
}
.nav-overlay.is-open{opacity:1;visibility:visible;}
.drawer-group{border-bottom:1px solid var(--line);padding:12px 0;}
.drawer-link{display:block;font-size:15px;font-weight:600;color:var(--ink-900);padding:8px 0;}
.drawer-link.active{color:var(--brand-600);}
.drawer-sub{display:flex;flex-direction:column;gap:6px;padding:4px 0 8px 12px;}
.drawer-sub a{font-size:14px;font-weight:500;color:var(--ink-500);}
.drawer-sub a:hover{color:var(--brand-600);}
.drawer-cta{margin-top:20px;}

/* ============ 分类页头 ============ */
.page-hero{
  position:relative;
  min-height:280px;
  display:flex;align-items:center;
  padding:56px 0 60px;
  background-image:linear-gradient(180deg,rgba(247,249,252,.90) 0%,rgba(247,249,252,.86) 55%,rgba(247,249,252,.95) 100%),url('/assets/images/backpic/back-2.webp');
  background-size:cover;background-position:center;
  border-bottom:1px solid var(--line);
}
.breadcrumb{display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-size:13px;color:var(--ink-500);margin-bottom:18px;}
.breadcrumb a{color:var(--ink-500);}
.breadcrumb a:hover{color:var(--brand-600);}
.breadcrumb .sep{color:#C3CBDA;}
.breadcrumb .current{color:var(--ink-500);}
.page-hero h1{
  font-size:clamp(28px,4vw,44px);
  line-height:1.22;font-weight:700;color:var(--ink-900);
  letter-spacing:-.02em;max-width:16em;
}
.page-hero .lede{margin-top:18px;font-size:17px;line-height:1.8;color:var(--ink-700);max-width:680px;}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px;}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  font-size:13px;font-weight:500;color:var(--brand-700);
  background:var(--surface);border:1px solid var(--line);
  padding:6px 14px;border-radius:var(--r-pill);box-shadow:var(--sh-1);
}

/* ============ 横向图文卡列表 ============ */
.entry-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;}
.entry-card{
  display:flex;gap:20px;align-items:stretch;
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-lg);padding:20px;box-shadow:var(--sh-2);
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.entry-card:hover{transform:translateY(-2px);box-shadow:var(--sh-3);border-color:#D8E1F5;}
.entry-media{
  flex:0 0 220px;width:220px;border-radius:var(--r-md);overflow:hidden;background:var(--brand-50);
}
.entry-media img{width:100%;height:100%;min-height:150px;object-fit:cover;transition:transform .35s ease;}
.entry-card:hover .entry-media img{transform:scale(1.03);}
.entry-body{flex:1 1 auto;display:flex;flex-direction:column;gap:10px;min-width:0;}
.entry-body h3{font-size:19px;line-height:1.4;font-weight:600;color:var(--ink-900);transition:color .2s ease;}
.entry-card:hover .entry-body h3{color:var(--brand-600);}
.entry-body p{font-size:14px;line-height:1.8;color:var(--ink-500);}
.entry-points{display:flex;flex-wrap:wrap;gap:8px;margin-top:auto;padding-top:6px;}
.pill{
  font-size:12.5px;font-weight:500;color:var(--ink-700);
  background:var(--bg);border:1px solid var(--line);
  padding:4px 10px;border-radius:var(--r-pill);
}
.pill--brand{color:var(--brand-700);background:var(--brand-50);border-color:#DCE6FB;}

/* ============ 数据带 ============ */
.stats-wrap{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  box-shadow:var(--sh-2);padding:32px 8px;display:grid;grid-template-columns:repeat(4,1fr);
}
.stat{padding:0 28px;position:relative;text-align:left;}
.stat + .stat{border-left:1px solid var(--line);}
.stat-num{font-size:32px;font-weight:700;color:var(--brand-600);line-height:1.2;letter-spacing:-.02em;}
.stat-num.accent{color:var(--accent-500);}
.stat-label{margin-top:6px;font-size:14px;color:var(--ink-500);line-height:1.6;}

/* ============ 流程步骤 ============ */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;position:relative;}
.step{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:24px;box-shadow:var(--sh-2);position:relative;
  transition:transform .2s ease,box-shadow .2s ease;
}
.step:hover{transform:translateY(-2px);box-shadow:var(--sh-3);}
.step-num{
  width:38px;height:38px;border-radius:12px;background:var(--brand-50);color:var(--brand-600);
  display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:700;margin-bottom:16px;
}
.step h3{font-size:17px;font-weight:600;color:var(--ink-900);line-height:1.45;margin-bottom:8px;}
.step p{font-size:14px;line-height:1.8;color:var(--ink-500);}

/* ============ 核对清单 + 提示卡 ============ */
.check-layout{display:grid;grid-template-columns:8fr 4fr;gap:24px;align-items:start;}
.check-panel{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:8px 24px;box-shadow:var(--sh-2);
}
.check-item{display:flex;gap:14px;padding:20px 0;border-bottom:1px solid var(--line);}
.check-item:last-child{border-bottom:0;}
.check-icon{
  flex:0 0 26px;width:26px;height:26px;border-radius:50%;
  background:var(--brand-50);color:var(--brand-600);
  display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;margin-top:2px;
}
.check-item h3{font-size:16px;font-weight:600;color:var(--ink-900);margin-bottom:6px;}
.check-item p{font-size:14px;line-height:1.8;color:var(--ink-500);}
.side-card{
  background:linear-gradient(180deg,var(--brand-50),#F8FAFF);
  border:1px solid #DCE6FB;border-radius:var(--r-lg);padding:24px;box-shadow:var(--sh-2);
}
.side-card h3{font-size:17px;font-weight:600;color:var(--ink-900);margin-bottom:12px;}
.side-card p{font-size:14px;line-height:1.85;color:var(--ink-700);}
.side-list{margin-top:16px;display:flex;flex-direction:column;gap:10px;}
.side-list li{position:relative;padding-left:18px;font-size:14px;line-height:1.7;color:var(--ink-700);}
.side-list li::before{
  content:"";position:absolute;left:0;top:9px;width:6px;height:6px;border-radius:50%;background:var(--brand-500);
}
.side-card .btn{margin-top:20px;}

/* ============ FAQ ============ */
.faq-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px 20px;align-items:start;}
.faq-item{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);
  box-shadow:var(--sh-1);overflow:hidden;transition:box-shadow .2s ease,border-color .2s ease;
}
.faq-item[open]{box-shadow:var(--sh-2);border-color:#D8E1F5;}
.faq-item summary{
  list-style:none;cursor:pointer;position:relative;
  padding:18px 52px 18px 20px;
  font-size:16px;font-weight:600;color:var(--ink-900);line-height:1.6;
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{
  content:"";position:absolute;right:22px;top:50%;
  width:11px;height:11px;border-right:2px solid var(--brand-600);border-bottom:2px solid var(--brand-600);
  transform:translateY(-70%) rotate(45deg);transition:transform .22s ease;
}
.faq-item[open] summary::after{transform:translateY(-30%) rotate(225deg);}
.faq-item[open] summary{border-left:3px solid var(--brand-600);padding-left:17px;}
.faq-answer{padding:0 22px 20px 23px;font-size:15px;line-height:1.85;color:var(--ink-700);}

/* ============ CTA + 表单 ============ */
.cta-layout{
  display:grid;grid-template-columns:7fr 5fr;gap:32px;align-items:start;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-xl);
  box-shadow:var(--sh-2);padding:40px;
}
.cta-copy h2{font-size:clamp(24px,2.6vw,30px);line-height:1.3;font-weight:700;color:var(--ink-900);}
.cta-copy p{margin-top:14px;font-size:16px;line-height:1.85;color:var(--ink-500);}
.cta-list{margin-top:24px;display:grid;gap:12px;}
.cta-list li{display:flex;gap:10px;font-size:15px;color:var(--ink-700);}
.cta-list li span{color:var(--accent-500);font-weight:700;}
.cta-info{margin-top:28px;display:flex;gap:24px;flex-wrap:wrap;}
.cta-info-item{font-size:14px;color:var(--ink-500);}
.cta-info-item strong{display:block;font-size:16px;color:var(--ink-900);font-weight:600;margin-top:2px;}
.form-card{
  background:var(--bg);border:1px solid var(--line);border-radius:var(--r-lg);padding:24px;
}
.form-row{margin-bottom:16px;}
.form-row label{display:block;font-size:13px;font-weight:600;color:var(--ink-900);margin-bottom:7px;}
.form-control{
  width:100%;height:46px;padding:0 14px;
  background:var(--surface);border:1px solid var(--line);border-radius:10px;
  font-size:15px;color:var(--ink-900);transition:border-color .2s ease,box-shadow .2s ease;
}
textarea.form-control{height:auto;min-height:104px;padding:12px 14px;line-height:1.7;resize:vertical;}
.form-control::placeholder{color:#9AA4B8;}
.form-control:focus{
  outline:none;border-color:var(--brand-500);
  box-shadow:0 0 0 3px var(--brand-50);
}
.form-control.is-error{border-color:var(--err);box-shadow:0 0 0 3px rgba(209,67,67,.10);}
.form-hint{display:none;margin-top:6px;font-size:13px;color:var(--err);}
.form-hint.show{display:block;}
.form-note{margin-top:14px;font-size:13px;line-height:1.7;color:var(--ink-500);}
.form-success{
  display:none;margin-top:14px;padding:12px 14px;border-radius:10px;
  background:rgba(14,159,110,.08);border:1px solid rgba(14,159,110,.28);
  font-size:14px;color:#0B7A55;
}
.form-success.show{display:block;}

/* ============ 页脚 ============ */
.site-footer{background:var(--ink-900);color:rgba(255,255,255,.72);padding:72px 0 0;margin-top:0;}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px;}
.footer-brand{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:700;color:#fff;margin-bottom:14px;}
.footer-desc{font-size:14px;line-height:1.85;color:rgba(255,255,255,.62);max-width:320px;}
.footer-title{font-size:14px;font-weight:600;color:#fff;margin-bottom:16px;letter-spacing:.02em;}
.footer-link{display:block;font-size:14px;line-height:1.7;color:rgba(255,255,255,.72);padding:5px 0;transition:color .2s ease,transform .2s ease;}
.footer-link:hover{color:var(--brand-500);transform:translateX(2px);}
.footer-bottom{
  margin-top:56px;padding:22px 0;border-top:1px solid rgba(255,255,255,.10);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:rgba(255,255,255,.50);
}

/* ============ 响应式 ============ */
@media (max-width:1279px){
  .container{max-width:1024px;}
  :root{--sp-section:80px;}
  .mega{width:680px;}
}
@media (max-width:1023px){
  :root{--sp-section:72px;}
  .main-nav{display:none;}
  .nav-toggle{display:flex;}
  .nav-actions .btn-primary{display:none;}
  .entry-grid{grid-template-columns:1fr;}
  .stats-wrap{grid-template-columns:repeat(2,1fr);gap:24px 0;padding:28px 8px;}
  .stat{padding:0 20px;}
  .stat:nth-child(odd){border-left:0;}
  .stat:nth-child(3),.stat:nth-child(4){border-top:1px solid var(--line);padding-top:24px;}
  .steps{grid-template-columns:repeat(2,1fr);}
  .check-layout{grid-template-columns:1fr;}
  .faq-grid{grid-template-columns:1fr;}
  .cta-layout{grid-template-columns:1fr;padding:32px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
}
@media (max-width:767px){
  :root{--sp-section:48px;}
  .container{padding:0 16px;}
  .section--tight{padding:44px 0;}
  .nav-inner{height:64px;}
  .nav-drawer,.nav-overlay{inset-top:64px;}
  .nav-drawer{inset:64px 0 0 auto;}
  .nav-overlay{inset:64px 0 0 0;}
  .page-hero{min-height:200px;padding:36px 0 40px;}
  .page-hero .lede{font-size:15.5px;}
  .entry-card{flex-direction:column;padding:16px;gap:16px;}
  .entry-media{flex:none;width:100%;height:180px;}
  .entry-media img{min-height:0;height:180px;}
  .steps{grid-template-columns:1fr;}
  .stats-wrap{grid-template-columns:1fr;padding:24px 20px;}
  .stat{padding:16px 0;}
  .stat + .stat{border-left:0;border-top:1px solid var(--line);}
  .stat:nth-child(3),.stat:nth-child(4){border-top:1px solid var(--line);padding-top:16px;}
  .check-panel{padding:4px 18px;}
  .cta-layout{padding:24px;}
  .footer-grid{grid-template-columns:1fr;gap:28px;}
  .footer-bottom{flex-direction:column;gap:8px;}
}
@media (max-width:480px){
  .btn{width:100%;}
  .entry-card{padding:14px;}
  .entry-body h3{font-size:17px;}
  .form-card{padding:18px;}
  .cta-copy h2{font-size:22px;}
}

/* roulang page: category2 */
:root{
  --brand-600:#1F4FD8;
  --brand-700:#1A42B4;
  --brand-500:#3A6BE8;
  --brand-50:#EEF3FE;
  --accent-500:#FF6B2C;
  --accent-50:#FFF1E9;
  --ink-900:#0E1524;
  --ink-700:#33405A;
  --ink-500:#64708A;
  --line:#E6EAF2;
  --bg:#F7F9FC;
  --surface:#FFFFFF;
  --success:#0E9F6E;
  --warning:#B45309;
  --danger:#D14343;
  --r-sm:8px;
  --r-md:12px;
  --r-lg:16px;
  --r-xl:20px;
  --sh-1:0 1px 2px rgba(16,24,40,.05);
  --sh-2:0 8px 24px -8px rgba(20,40,100,.12);
  --sh-3:0 18px 40px -12px rgba(20,40,100,.18);
  --container:1200px;
  --nav-h:72px;
  --sec-y:96px;
  --ease:.2s ease;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Source Han Sans SC",Inter,system-ui,sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--ink-700);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{margin:0;color:var(--ink-900);font-weight:700;line-height:1.3}
h1{font-size:clamp(30px,4vw,46px);line-height:1.2}
h2{font-size:clamp(24px,2.6vw,32px)}
h3{font-size:20px;line-height:1.4;font-weight:600}
p{margin:0}
a{color:var(--brand-600);text-decoration:none;transition:color var(--ease)}
a:hover{color:var(--brand-700)}
img{max-width:100%;display:block;border:0}
ul,ol{margin:0;padding:0;list-style:none}
button,input,textarea,select{font:inherit;color:inherit}
button{cursor:pointer}
:focus-visible{outline:2px solid var(--brand-500);outline-offset:2px;border-radius:4px}
.container{max-width:var(--container);margin:0 auto;padding:0 24px}

/* ============ 顶栏 ============ */
.site-header{
  position:sticky;top:0;z-index:80;background:#fff;
  border-bottom:1px solid var(--line);
  transition:box-shadow var(--ease);
}
.site-header.is-scrolled{box-shadow:var(--sh-1)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;height:var(--nav-h)}
.brand{display:inline-flex;align-items:center;gap:10px;font-size:18px;font-weight:700;color:var(--ink-900);letter-spacing:.2px}
.brand:hover{color:var(--ink-900)}
.brand-mark{
  width:28px;height:28px;border-radius:8px;background:var(--brand-600);color:#fff;
  display:inline-flex;align-items:center;justify-content:center;
  font-size:14px;font-weight:700;line-height:1;flex:0 0 auto;
}
.main-nav{display:flex;align-items:center;gap:4px}
.nav-item{position:relative}
.nav-link{
  display:inline-flex;align-items:center;gap:6px;height:var(--nav-h);
  padding:0 14px;font-size:15px;font-weight:500;color:var(--ink-700);
  position:relative;transition:color var(--ease);white-space:nowrap;
}
.nav-link:hover{color:var(--brand-600)}
.nav-item.active .nav-link{color:var(--brand-600);font-weight:600}
.nav-item.active .nav-link::after{
  content:"";position:absolute;left:14px;right:14px;bottom:14px;height:2px;border-radius:2px;background:var(--brand-600);
}
.caret{
  width:6px;height:6px;border-right:1.6px solid currentColor;border-bottom:1.6px solid currentColor;
  transform:rotate(45deg) translate(-2px,-2px);transition:transform var(--ease);display:inline-block;
}
.nav-item.has-mega:hover .caret{transform:rotate(225deg) translate(-2px,-2px)}
.nav-toggle{
  display:none;width:44px;height:44px;border:1px solid var(--line);border-radius:10px;
  background:#fff;align-items:center;justify-content:center;
}
.nav-toggle span{position:relative;display:block;width:18px;height:2px;border-radius:2px;background:var(--ink-900)}
.nav-toggle span::before,.nav-toggle span::after{
  content:"";position:absolute;left:0;width:18px;height:2px;border-radius:2px;background:var(--ink-900);transition:transform var(--ease)
}
.nav-toggle span::before{top:-6px}
.nav-toggle span::after{top:6px}

/* Mega Menu */
.mega{
  position:absolute;top:calc(100% - 10px);left:50%;
  transform:translateX(-50%) translateY(-4px);
  width:800px;background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);
  box-shadow:var(--sh-3);padding:24px;z-index:90;
  opacity:0;visibility:hidden;
  transition:opacity .18s ease,transform .18s ease,visibility .18s ease;
}
.nav-item.has-mega:hover .mega,
.nav-item.has-mega:focus-within .mega{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
.mega-grid{display:grid;grid-template-columns:1fr 1.35fr 1.05fr}
.mega-col{padding:0 20px}
.mega-col:first-child{padding-left:0}
.mega-col:last-child{padding-right:0}
.mega-col + .mega-col{border-left:1px solid var(--line)}
.mega-title{font-size:13px;font-weight:600;color:var(--ink-500);margin-bottom:12px;letter-spacing:.4px}
.mega-list a{
  display:block;padding:7px 0;font-size:14px;color:var(--ink-700);
  transition:color var(--ease),transform var(--ease);
}
.mega-list a:hover{color:var(--brand-600);transform:translateX(2px)}
.mega-list a.current{color:var(--brand-600);font-weight:600}
.mega-list a.current::before{content:"";display:inline-block;width:4px;height:4px;border-radius:50%;background:var(--brand-600);margin-right:8px;vertical-align:middle}
.mega-post{display:flex;gap:12px;align-items:flex-start;padding:8px 0;border-radius:10px;transition:background var(--ease)}
.mega-post:hover{background:#F9FBFF}
.mega-thumb{width:64px;height:48px;border-radius:8px;overflow:hidden;flex:0 0 auto;background:var(--brand-50)}
.mega-thumb img{width:100%;height:100%;object-fit:cover}
.mega-post-title{display:block;font-size:14px;font-weight:500;color:var(--ink-900);line-height:1.5;transition:color var(--ease)}
.mega-post:hover .mega-post-title{color:var(--brand-600)}
.mega-post-time{display:block;font-size:12px;color:var(--ink-500);margin-top:4px}
.mega-entry{
  background:var(--brand-50);border-radius:var(--r-md);padding:18px;
  display:flex;flex-direction:column;gap:8px;
}
.mega-entry-icon{
  width:34px;height:34px;border-radius:10px;background:#fff;color:var(--brand-600);
  display:inline-flex;align-items:center;justify-content:center;font-weight:700;font-size:15px;
}
.mega-entry p{font-size:13px;line-height:1.7;color:var(--ink-700)}
.mega-entry .link-arrow{font-size:13px;margin-top:2px}

/* ============ 通用组件 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 20px;border-radius:10px;border:1px solid transparent;
  font-size:15px;font-weight:600;line-height:1;cursor:pointer;
  transition:background var(--ease),color var(--ease),border-color var(--ease),transform var(--ease),box-shadow var(--ease);
}
.btn-primary{background:var(--brand-600);color:#fff;box-shadow:0 8px 18px -10px rgba(31,79,216,.85)}
.btn-primary:hover{background:var(--brand-700);color:#fff;transform:translateY(-1px)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--ink-900)}
.btn-ghost:hover{border-color:var(--brand-500);color:var(--brand-600)}
.btn-accent{background:var(--accent-500);color:#fff}
.btn-accent:hover{background:#E85E20;color:#fff;transform:translateY(-1px)}
.btn-block{width:100%}
.btn-sm{height:38px;font-size:14px;padding:0 16px}
.btn[disabled],.btn.is-disabled{opacity:.55;cursor:not-allowed;transform:none}
.link-arrow{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--brand-600)}
.link-arrow svg{transition:transform var(--ease)}
.link-arrow:hover svg{transform:translateX(2px)}
.tag{
  display:inline-flex;align-items:center;gap:6px;padding:4px 11px;border-radius:999px;
  background:var(--brand-50);color:var(--brand-600);font-size:13px;line-height:1.4;font-weight:500;
}
.tag-accent{background:var(--accent-50);color:#C24A17}
.tag-muted{background:#F1F4F9;color:var(--ink-500)}
.tag-ok{background:#E7F7F1;color:#0B7A55}
.tag-warn{background:#FDF3E6;color:var(--warning)}
.section{padding:var(--sec-y) 0}
.section-tight{padding:64px 0}
.section-alt{background:#FFFFFF}
.section-head{max-width:760px;margin-bottom:40px}
.section-head h2{margin-bottom:12px}
.section-head p{font-size:16px;color:var(--ink-500)}
.section-head-row{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;flex-wrap:wrap;margin-bottom:40px}
.section-head-row .section-head{margin-bottom:0}
.divider{height:1px;background:var(--line);border:0;margin:0}

/* ============ 页头 ============ */
.page-hero{
  position:relative;min-height:280px;display:flex;align-items:center;
  padding:64px 0;
  background-image:url('/assets/images/backpic/back-2.webp');
  background-size:cover;background-position:center;
  border-bottom:1px solid var(--line);
}
.page-hero::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(100deg,rgba(255,255,255,.95) 0%,rgba(255,255,255,.86) 52%,rgba(255,255,255,.72) 100%);
}
.page-hero .container{position:relative;z-index:1;width:100%}
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:14px;color:var(--ink-500);margin-bottom:16px}
.breadcrumb a{color:var(--ink-500)}
.breadcrumb a:hover{color:var(--brand-600)}
.breadcrumb .sep{color:#B6BFD2}
.breadcrumb .current{color:var(--ink-500)}
.page-hero h1{margin-bottom:14px;max-width:820px}
.page-hero-lead{max-width:680px;font-size:16px;color:var(--ink-700)}
.page-hero-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}

/* ============ 布局 ============ */
.layout-8-4{display:grid;grid-template-columns:minmax(0,2fr) minmax(0,1fr);gap:32px;align-items:start}
.layout-4-8{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,2fr);gap:32px;align-items:start}

/* ============ 编号条目 ============ */
.step-list{display:grid;gap:16px}
.step-item{
  display:grid;grid-template-columns:56px minmax(0,1fr);gap:20px;
  padding:24px;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-lg);box-shadow:var(--sh-1);
  transition:box-shadow var(--ease),transform var(--ease),border-color var(--ease);
}
.step-item:hover{box-shadow:var(--sh-2);transform:translateY(-2px);border-color:#DDE5F5}
.step-num{
  width:56px;height:56px;border-radius:14px;background:var(--brand-50);color:var(--brand-600);
  display:flex;align-items:center;justify-content:center;
  font-size:20px;font-weight:700;font-family:Inter,system-ui,sans-serif;
}
.step-body h3{margin-bottom:8px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.step-body > p{font-size:15px;color:var(--ink-700)}
.step-points{display:grid;gap:8px;margin-top:14px}
.step-points li{position:relative;padding-left:16px;font-size:14px;line-height:1.7;color:var(--ink-500)}
.step-points li::before{
  content:"";position:absolute;left:0;top:9px;width:6px;height:6px;border-radius:50%;background:var(--brand-500);
}

/* ============ 侧栏卡 ============ */
.side-col{display:grid;gap:20px;position:sticky;top:calc(var(--nav-h) + 24px)}
.aside-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:24px;box-shadow:var(--sh-2);
}
.aside-card h3{font-size:17px;margin-bottom:6px}
.aside-card .aside-sub{font-size:13px;color:var(--ink-500);margin-bottom:14px}
.aside-list li{
  display:flex;gap:10px;align-items:flex-start;padding:10px 0;
  border-bottom:1px dashed var(--line);font-size:14px;line-height:1.7;color:var(--ink-700);
}
.aside-list li:last-child{border-bottom:0;padding-bottom:0}
.aside-list .dot{
  width:18px;height:18px;border-radius:50%;background:var(--brand-50);color:var(--brand-600);
  display:inline-flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;flex:0 0 auto;margin-top:4px;
}
.aside-card.tint{background:var(--brand-50);border-color:#D8E3FB;box-shadow:none}
.aside-card.tint .aside-list li{border-bottom-color:#D8E3FB}
.aside-card.tint .dot{background:#fff}
.stat-row{display:flex;gap:24px;padding-top:16px;margin-top:16px;border-top:1px solid var(--line)}
.stat-row .num{font-size:24px;font-weight:700;color:var(--brand-600);font-family:Inter,system-ui,sans-serif;line-height:1.2}
.stat-row .lbl{font-size:13px;color:var(--ink-500);margin-top:2px}
.aside-card .btn{margin-top:18px}

/* ============ 卡片网格 ============ */
.card-grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.card-grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.feature-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:28px;box-shadow:var(--sh-2);
  transition:box-shadow var(--ease),transform var(--ease);
}
.feature-card:hover{box-shadow:var(--sh-3);transform:translateY(-2px)}
.card-icon{
  width:44px;height:44px;border-radius:12px;background:var(--brand-50);color:var(--brand-600);
  display:flex;align-items:center;justify-content:center;margin-bottom:18px;
}
.card-icon svg{width:22px;height:22px}
.feature-card h3{margin-bottom:10px}
.feature-card p{font-size:15px;color:var(--ink-700)}
.feature-card .tag-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.media-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  overflow:hidden;box-shadow:var(--sh-2);transition:box-shadow var(--ease),transform var(--ease);
}
.media-card:hover{box-shadow:var(--sh-3);transform:translateY(-2px)}
.media-thumb{aspect-ratio:3/2;overflow:hidden;background:var(--brand-50)}
.media-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease}
.media-card:hover .media-thumb img{transform:scale(1.03)}
.media-body{padding:24px}
.media-body h3{font-size:18px;margin-bottom:10px;transition:color var(--ease)}
.media-card:hover .media-body h3{color:var(--brand-600)}
.media-body p{font-size:14px;line-height:1.7;color:var(--ink-500)}

/* ============ 时间轴 ============ */
.timeline{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px}
.tl-item{position:relative;padding-top:44px}
.tl-item::before{
  content:"";position:absolute;top:15px;left:0;right:0;height:2px;background:var(--line);border-radius:2px;
}
.tl-item:last-child::before{right:calc(100% - 16px)}
.tl-dot{
  position:absolute;top:7px;left:0;width:18px;height:18px;border-radius:50%;
  background:#fff;border:2px solid var(--brand-500);z-index:1;
}
.tl-item:first-child .tl-dot{background:var(--brand-600);border-color:var(--brand-600)}
.tl-step{font-size:13px;font-weight:600;color:var(--brand-600);margin-bottom:6px;font-family:Inter,system-ui,sans-serif}
.tl-item h3{font-size:17px;margin-bottom:8px}
.tl-item p{font-size:14px;line-height:1.7;color:var(--ink-500)}

/* ============ 表格 ============ */
.table-wrap{
  overflow-x:auto;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-lg);box-shadow:var(--sh-1);
}
table{width:100%;border-collapse:collapse;min-width:680px;font-size:15px}
thead th{
  background:#F3F6FC;color:var(--ink-900);font-weight:600;text-align:left;
  padding:14px 20px;border-bottom:1px solid var(--line);font-size:14px;white-space:nowrap;
}
tbody td{padding:16px 20px;border-bottom:1px solid var(--line);color:var(--ink-700);vertical-align:top;line-height:1.7}
tbody tr:last-child td{border-bottom:0}
tbody tr{transition:background var(--ease)}
tbody tr:hover{background:#FAFBFE}
tbody td:first-child{color:var(--ink-900);font-weight:500}
.table-note{font-size:13px;color:var(--ink-500);margin-top:12px}

/* ============ FAQ ============ */
.faq-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;align-items:start}
.faq-item{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  box-shadow:var(--sh-2);overflow:hidden;transition:box-shadow var(--ease);
}
.faq-item:hover{box-shadow:var(--sh-3)}
.faq-item summary{
  list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:20px 24px;font-size:16px;font-weight:600;color:var(--ink-900);
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{
  content:"+";font-size:20px;font-weight:400;line-height:1;color:var(--brand-600);
  flex:0 0 auto;transition:transform var(--ease);
}
.faq-item[open] summary::after{content:"−"}
.faq-body{
  padding:0 24px 22px;font-size:15px;line-height:1.8;color:var(--ink-700);
}
.faq-item[open] .faq-body{
  border-left:3px solid var(--brand-600);margin-left:24px;padding-left:16px;
}

/* ============ CTA ============ */
.cta-band{
  background:var(--ink-900);color:rgba(255,255,255,.78);
  border-radius:var(--r-xl);padding:48px;
  display:grid;grid-template-columns:1.45fr 1fr;gap:32px;align-items:center;
  position:relative;overflow:hidden;
}
.cta-band::after{
  content:"";position:absolute;right:-60px;top:-60px;width:260px;height:260px;border-radius:50%;
  background:radial-gradient(circle,rgba(58,107,232,.35),rgba(58,107,232,0) 70%);
}
.cta-band h2{color:#fff;margin-bottom:12px}
.cta-band p{font-size:15px;line-height:1.8;color:rgba(255,255,255,.72);max-width:560px}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}
.cta-side{
  position:relative;z-index:1;background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.12);border-radius:var(--r-lg);padding:24px;
}
.cta-side .cta-side-title{color:#fff;font-size:15px;font-weight:600;margin-bottom:12px}
.cta-side li{
  font-size:14px;color:rgba(255,255,255,.7);padding:8px 0 8px 18px;position:relative;border-bottom:1px dashed rgba(255,255,255,.12);
}
.cta-side li:last-child{border-bottom:0}
.cta-side li::before{
  content:"";position:absolute;left:0;top:17px;width:6px;height:6px;border-radius:50%;background:var(--accent-500);
}
.cta-band .btn-ghost{background:transparent;border-color:rgba(255,255,255,.28);color:#fff}
.cta-band .btn-ghost:hover{border-color:#fff;color:#fff;background:rgba(255,255,255,.08)}

/* ============ 页脚 ============ */
.site-footer{background:var(--ink-900);color:rgba(255,255,255,.72);padding-top:64px;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:32px;padding-bottom:44px}
.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-size:18px;font-weight:700;margin-bottom:14px}
.footer-brand .brand-mark{background:var(--brand-500)}
.footer-desc{font-size:14px;line-height:1.8;color:rgba(255,255,255,.66);max-width:340px}
.footer-title{color:#fff;font-size:15px;font-weight:600;margin-bottom:14px}
.footer-link{display:block;font-size:14px;color:rgba(255,255,255,.72);padding:6px 0;transition:color var(--ease)}
.footer-link:hover{color:var(--brand-500)}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.12);padding:20px 0;
  display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;
  font-size:13px;color:rgba(255,255,255,.55);
}

/* ============ 响应式 ============ */
@media (max-width:1100px){
  .layout-8-4,.layout-4-8{grid-template-columns:minmax(0,1fr)}
  .side-col{position:static}
  .mega{width:660px}
  .mega-grid{grid-template-columns:1fr 1fr}
  .mega-col:last-child{display:none}
}
@media (max-width:1024px){
  :root{--sec-y:72px}
  .card-grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .timeline{grid-template-columns:repeat(2,minmax(0,1fr))}
  .tl-item:nth-child(2)::before{right:calc(100% - 16px)}
  .cta-band{grid-template-columns:1fr;padding:40px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
}
@media (max-width:900px){
  .nav-toggle{display:inline-flex}
  .main-nav{
    position:fixed;top:var(--nav-h);left:0;right:0;bottom:0;
    background:#fff;flex-direction:column;align-items:stretch;gap:0;
    padding:8px 20px 48px;overflow-y:auto;
    border-top:1px solid var(--line);
    transform:translateY(-8px);opacity:0;visibility:hidden;
    transition:opacity var(--ease),transform var(--ease),visibility var(--ease);
  }
  .main-nav.open{transform:translateY(0);opacity:1;visibility:visible}
  .nav-item{border-bottom:1px solid var(--line)}
  .nav-link{height:auto;width:100%;padding:16px 2px;font-size:16px;justify-content:space-between}
  .nav-item.active .nav-link::after{display:none}
  .mega{
    position:static;width:auto;transform:none;opacity:1;visibility:visible;
    box-shadow:none;border:0;border-radius:0;padding:0 0 14px;display:none;
  }
  .nav-item.has-mega.open .mega{display:block}
  .mega-grid{grid-template-columns:1fr;gap:0}
  .mega-col{padding:10px 2px}
  .mega-col:first-child{padding-left:2px}
  .mega-col:last-child{padding-right:2px;display:block}
  .mega-col + .mega-col{border-left:0;border-top:1px dashed var(--line)}
}
@media (max-width:767px){
  :root{--sec-y:48px}
  .container{padding:0 16px}
  .page-hero{min-height:200px;padding:44px 0}
  .card-grid-3,.card-grid-2,.faq-grid,.timeline{grid-template-columns:minmax(0,1fr)}
  .tl-item{padding-top:36px}
  .tl-item::before{display:none}
  .step-item{grid-template-columns:minmax(0,1fr);gap:16px;padding:20px}
  .step-num{width:46px;height:46px;border-radius:12px;font-size:18px}
  .aside-card{padding:20px}
  .cta-band{padding:32px 24px;border-radius:var(--r-lg)}
  .cta-actions .btn{width:100%}
  .footer-grid{grid-template-columns:1fr;gap:24px;padding-bottom:32px}
  .faq-item[open] .faq-body{margin-left:20px}
}
@media (max-width:520px){
  h1{font-size:28px}
  h2{font-size:22px}
  .brand{font-size:16px}
  .feature-card{padding:20px}
  .faq-item summary{padding:16px 18px;font-size:15px}
  .faq-body{padding:0 18px 18px}
  .btn{width:100%}
  .cta-actions{flex-direction:column}
  .breadcrumb{font-size:13px}
}

/* roulang page: category3 */
:root{
  --brand-600:#1F4FD8;
  --brand-700:#1A42B4;
  --brand-500:#3A6BE8;
  --brand-50:#EEF3FE;
  --accent-500:#FF6B2C;
  --accent-50:#FFF1E9;
  --ink-900:#0E1524;
  --ink-700:#33405A;
  --ink-500:#64708A;
  --line:#E6EAF2;
  --bg:#F7F9FC;
  --surface:#FFFFFF;
  --success:#0E9F6E;
  --warning:#B45309;
  --error:#D14343;
  --r-sm:8px;
  --r-md:12px;
  --r-lg:16px;
  --r-xl:20px;
  --r-pill:999px;
  --sh-1:0 1px 2px rgba(16,24,40,.05);
  --sh-2:0 8px 24px -8px rgba(20,40,100,.12);
  --sh-3:0 18px 40px -12px rgba(20,40,100,.18);
  --container:1200px;
  --sp:24px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;overflow-x:hidden}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink-700);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Source Han Sans SC",sans-serif;
  font-size:16px;
  line-height:1.75;
  overflow-x:hidden;
}
img{max-width:100%;display:block;border:0}
a{color:var(--brand-600);text-decoration:none;transition:color .18s ease}
a:hover{color:var(--brand-700)}
button,input,select,textarea{font:inherit;color:inherit}
h1,h2,h3,h4,p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--brand-500);outline-offset:2px;border-radius:4px}

.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px}

/* ============ 顶部导航 ============ */
.site-header{
  position:sticky;
  top:0;
  z-index:90;
  background:#fff;
  border-bottom:1px solid var(--line);
  transition:box-shadow .2s ease;
}
.site-header.is-scrolled{box-shadow:var(--sh-1)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;height:72px}
.brand{display:inline-flex;align-items:center;gap:10px;font-size:18px;font-weight:700;color:var(--ink-900);letter-spacing:.01em}
.brand:hover{color:var(--ink-900)}
.brand-mark{
  width:28px;height:28px;border-radius:var(--r-sm);
  background:linear-gradient(135deg,var(--brand-600),var(--brand-500));
  color:#fff;display:grid;place-items:center;font-size:15px;font-weight:700;
  box-shadow:0 6px 14px -8px rgba(31,79,216,.9);
}
.main-nav{display:flex;align-items:center;gap:4px}
.nav-item{position:relative}
.nav-link{
  display:inline-flex;align-items:center;gap:6px;
  padding:10px 14px;border-radius:10px;
  font-size:15px;font-weight:500;color:var(--ink-700);
  transition:color .18s ease,background .18s ease;
}
.nav-link:hover{color:var(--brand-600);background:var(--brand-50)}
.nav-item.active > .nav-link{color:var(--brand-600)}
.nav-item.active > .nav-link::after{
  content:"";position:absolute;left:14px;right:14px;bottom:2px;height:2px;
  border-radius:2px;background:var(--brand-600);
}
.caret{
  width:6px;height:6px;border-right:1.6px solid currentColor;border-bottom:1.6px solid currentColor;
  transform:rotate(45deg) translateY(-1px);transition:transform .18s ease;opacity:.75;
}
.nav-item.has-mega:hover .caret,.nav-item.has-mega:focus-within .caret{transform:rotate(225deg) translateY(-1px)}
.header-cta{display:inline-flex;align-items:center;gap:8px}
.nav-toggle{
  display:none;width:42px;height:42px;border:1px solid var(--line);border-radius:10px;
  background:#fff;cursor:pointer;padding:0;place-items:center;
}
.nav-toggle span{display:block;width:18px;height:2px;margin:3px auto;border-radius:2px;background:var(--ink-900);transition:transform .22s ease,opacity .2s ease}
.nav-toggle.is-active span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle.is-active span:nth-child(2){opacity:0}
.nav-toggle.is-active span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

/* Mega Menu */
.mega{
  position:absolute;top:calc(100% + 12px);left:50%;
  width:760px;padding:24px;
  background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);
  box-shadow:var(--sh-3);
  opacity:0;visibility:hidden;transform:translateX(-50%) translateY(-4px);
  transition:opacity .18s ease,transform .18s ease,visibility .18s;
}
.nav-item.has-mega:hover .mega,
.nav-item.has-mega:focus-within .mega{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
.mega-grid{display:grid;grid-template-columns:1.1fr 1.3fr 1fr;gap:24px}
.mega-col + .mega-col{border-left:1px solid var(--line);padding-left:24px}
.mega-title{font-size:13px;font-weight:600;color:var(--ink-500);letter-spacing:.05em;margin-bottom:12px}
.mega-list a{
  display:block;font-size:15px;font-weight:500;color:var(--ink-700);
  padding:7px 0;transition:color .18s ease,transform .18s ease;
}
.mega-list a:hover{color:var(--brand-600);transform:translateX(2px)}
.mega-list a.is-current{color:var(--brand-600)}
.mega-post{display:flex;gap:12px;padding:8px 0;align-items:flex-start}
.mega-post:hover .mega-post-title{color:var(--brand-600)}
.mega-thumb{flex:0 0 64px;width:64px;height:48px;border-radius:var(--r-sm);overflow:hidden;background:var(--brand-50)}
.mega-thumb img{width:100%;height:100%;object-fit:cover}
.mega-post-title{display:block;font-size:14px;font-weight:500;color:var(--ink-900);line-height:1.5;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.mega-post-time{display:block;font-size:12px;color:var(--ink-500);margin-top:4px}
.mega-entry{
  display:block;background:var(--brand-50);border-radius:var(--r-md);padding:18px;
}
.mega-entry strong{display:block;font-size:15px;color:var(--ink-900);margin-bottom:6px}
.mega-entry span{display:block;font-size:13px;color:var(--ink-500);line-height:1.6}
.mega-entry em{display:inline-flex;align-items:center;gap:6px;margin-top:12px;font-style:normal;font-size:13px;font-weight:600;color:var(--brand-600)}
.mega-entry:hover em svg{transform:translateX(2px)}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 22px;border-radius:10px;border:1px solid transparent;
  font-size:15px;font-weight:600;cursor:pointer;
  transition:background .18s ease,color .18s ease,border-color .18s ease,transform .18s ease,box-shadow .18s ease;
}
.btn-primary{background:var(--brand-600);color:#fff;box-shadow:0 10px 20px -12px rgba(31,79,216,.9)}
.btn-primary:hover{background:var(--brand-700);color:#fff;transform:translateY(-1px)}
.btn-primary:active{transform:translateY(0);box-shadow:none}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--ink-900)}
.btn-ghost:hover{border-color:var(--brand-500);color:var(--brand-600)}
.btn-ghost:active{transform:translateY(1px)}
.btn-accent{background:var(--accent-500);color:#fff}
.btn-accent:hover{color:#fff;filter:brightness(.95);transform:translateY(-1px)}
.btn-sm{height:38px;padding:0 16px;font-size:14px}
.btn-block{width:100%}
.btn[disabled]{opacity:.55;cursor:not-allowed;transform:none}
.text-link{display:inline-flex;align-items:center;gap:6px;font-size:15px;font-weight:600;color:var(--brand-600)}
.text-link svg{transition:transform .18s ease}
.text-link:hover svg{transform:translateX(2px)}

/* ============ 页头 Banner ============ */
.page-hero{
  position:relative;
  background-image:url('/assets/images/backpic/back-2.webp');
  background-size:cover;
  background-position:center;
  overflow:hidden;
}
.page-hero::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(104deg,rgba(255,255,255,.93) 0%,rgba(255,255,255,.80) 50%,rgba(247,249,252,.74) 100%);
}
.page-hero .container{position:relative;z-index:2;padding-top:46px;padding-bottom:54px}
.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(--ink-500)}
.breadcrumb a:hover{color:var(--brand-600)}
.breadcrumb .sep{color:#B7C0D2}
.breadcrumb .current{color:var(--ink-500)}
.page-hero h1{
  font-size:clamp(30px,4vw,46px);line-height:1.2;font-weight:700;color:var(--ink-900);
  max-width:840px;margin-bottom:16px;
}
.page-hero .lead{font-size:17px;line-height:1.8;color:var(--ink-700);max-width:730px}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  height:30px;padding:0 14px;border-radius:var(--r-pill);
  background:#fff;border:1px solid var(--line);
  font-size:13px;font-weight:500;color:var(--ink-700);
}
.tag--brand{background:var(--brand-50);border-color:transparent;color:var(--brand-600);font-weight:600}
.tag--accent{background:var(--accent-50);border-color:transparent;color:#C24E15;font-weight:600}

/* ============ 通用板块 ============ */
.section{padding:96px 0}
.section--soft{background:#fff}
.section--tint{background:var(--bg)}
.section-head{max-width:740px;margin-bottom:48px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 14px;border-radius:var(--r-pill);
  background:var(--brand-50);color:var(--brand-600);
  font-size:13px;font-weight:600;margin-bottom:16px;
}
.section-title{font-size:clamp(24px,2.6vw,32px);line-height:1.3;font-weight:700;color:var(--ink-900);margin-bottom:14px}
.section-sub{font-size:16px;line-height:1.75;color:var(--ink-500)}
.divider{height:1px;background:var(--line);border:0;margin:0}

/* ============ 概览区 7:5 ============ */
.overview{display:grid;grid-template-columns:7fr 5fr;gap:48px;align-items:center}
.overview-copy p{font-size:16px;line-height:1.85;color:var(--ink-700);margin-bottom:18px}
.check-list{display:grid;gap:12px;margin:24px 0 30px}
.check-list li{display:flex;gap:12px;align-items:flex-start;font-size:15px;line-height:1.7;color:var(--ink-700)}
.check-list .dot{
  flex:0 0 22px;width:22px;height:22px;border-radius:50%;
  background:var(--brand-50);color:var(--brand-600);
  display:grid;place-items:center;font-size:12px;font-weight:700;margin-top:2px;
}
.overview-actions{display:flex;flex-wrap:wrap;gap:12px}
.overview-media{position:relative}
.overview-media .frame{
  border-radius:var(--r-xl);overflow:hidden;background:var(--brand-50);box-shadow:var(--sh-2);
}
.overview-media .frame img{width:100%;aspect-ratio:4/3;object-fit:cover}
.float-card{
  position:absolute;left:-20px;bottom:-24px;
  background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);
  box-shadow:var(--sh-3);padding:18px 22px;min-width:210px;
}
.float-card .num{font-size:30px;font-weight:700;color:var(--accent-500);line-height:1.1}
.float-card .cap{font-size:13px;color:var(--ink-500);margin-top:6px}

/* ============ 数据带 ============ */
.stats{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-xl);
  box-shadow:var(--sh-2);display:grid;grid-template-columns:repeat(4,1fr);
  overflow:hidden;margin-top:-46px;position:relative;z-index:5;
}
.stat{padding:28px 24px;text-align:center}
.stat + .stat{border-left:1px solid var(--line)}
.stat .num{font-size:32px;font-weight:700;color:var(--brand-600);line-height:1.15}
.stat .num em{font-style:normal;font-size:16px;font-weight:600;margin-left:2px;color:var(--ink-500)}
.stat .lab{font-size:14px;color:var(--ink-500);margin-top:8px}

/* ============ 时间轴 ============ */
.timeline{position:relative;max-width:920px}
.timeline::before{
  content:"";position:absolute;left:23px;top:8px;bottom:8px;width:2px;
  background:linear-gradient(180deg,var(--brand-500) 0%,var(--brand-50) 100%);
}
.tl-item{position:relative;padding-left:76px;padding-bottom:28px}
.tl-item:last-child{padding-bottom:0}
.tl-dot{
  position:absolute;left:0;top:0;width:48px;height:48px;border-radius:50%;
  background:#fff;border:1px solid var(--line);box-shadow:var(--sh-1);
  display:grid;place-items:center;font-size:15px;font-weight:700;color:var(--brand-600);
}
.tl-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-md);
  padding:20px 24px;box-shadow:var(--sh-1);transition:box-shadow .2s ease,transform .2s ease;
}
.tl-card:hover{box-shadow:var(--sh-2);transform:translateY(-2px)}
.tl-card h3{font-size:18px;font-weight:600;color:var(--ink-900);margin-bottom:8px}
.tl-card p{font-size:15px;line-height:1.75;color:var(--ink-700)}
.tl-meta{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px}

/* ============ 不等高卡片网格 ============ */
.topic-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;align-items:start}
.topic-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);
  box-shadow:var(--sh-2);overflow:hidden;
  transition:box-shadow .2s ease,transform .2s ease;
}
.topic-card:hover{box-shadow:var(--sh-3);transform:translateY(-2px)}
.topic-cover{overflow:hidden;background:var(--brand-50)}
.topic-cover img{width:100%;object-fit:cover;transition:transform .3s ease}
.topic-card:hover .topic-cover img{transform:scale(1.03)}
.topic-body{padding:24px}
.topic-body h3{font-size:19px;font-weight:600;color:var(--ink-900);margin:12px 0 10px;line-height:1.45}
.topic-body p{font-size:15px;line-height:1.75;color:var(--ink-700)}
.mini-list{margin-top:16px;display:grid;gap:10px}
.mini-list li{display:flex;gap:10px;font-size:14px;line-height:1.7;color:var(--ink-500)}
.mini-list li::before{content:"";flex:0 0 6px;width:6px;height:6px;border-radius:50%;background:var(--brand-500);margin-top:8px}
.tc-a .topic-cover img{height:200px}
.tc-b .topic-cover img{height:260px}
.tc-c .topic-cover img{height:160px}
.tc-b{margin-top:28px}
.tc-c{margin-top:-18px}

/* ============ 排查清单 8:4 ============ */
.check-panel{display:grid;grid-template-columns:8fr 4fr;gap:32px;align-items:start}
.step-list{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--sh-2);padding:8px 24px}
.step-item{display:flex;gap:18px;padding:22px 0}
.step-item + .step-item{border-top:1px dashed var(--line)}
.step-no{
  flex:0 0 34px;width:34px;height:34px;border-radius:10px;
  background:var(--brand-50);color:var(--brand-600);
  display:grid;place-items:center;font-size:14px;font-weight:700;
}
.step-item h3{font-size:16px;font-weight:600;color:var(--ink-900);margin-bottom:6px}
.step-item p{font-size:14px;line-height:1.75;color:var(--ink-500)}
.tip-card{
  background:var(--ink-900);color:rgba(255,255,255,.78);
  border-radius:var(--r-lg);padding:26px;box-shadow:var(--sh-3);position:sticky;top:96px;
}
.tip-card h3{color:#fff;font-size:17px;font-weight:600;margin-bottom:14px}
.tip-card ul{display:grid;gap:12px}
.tip-card li{display:flex;gap:10px;font-size:14px;line-height:1.7}
.tip-card li::before{content:"";flex:0 0 6px;width:6px;height:6px;border-radius:50%;background:var(--accent-500);margin-top:9px}
.tip-card .tip-note{
  margin-top:20px;padding-top:18px;border-top:1px solid rgba(255,255,255,.14);
  font-size:13px;color:rgba(255,255,255,.6);
}

/* ============ FAQ ============ */
.faq-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;align-items:start}
.faq-item{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);
  box-shadow:var(--sh-2);overflow:hidden;transition:box-shadow .2s ease;
}
.faq-item[open]{box-shadow:var(--sh-3)}
.faq-item summary{
  list-style:none;cursor:pointer;display:flex;align-items:flex-start;gap:14px;
  padding:20px 22px;font-size:16px;font-weight:600;color:var(--ink-900);line-height:1.6;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary:hover{color:var(--brand-600)}
.faq-sign{
  flex:0 0 22px;width:22px;height:22px;border-radius:50%;background:var(--brand-50);
  color:var(--brand-600);display:grid;place-items:center;font-size:15px;font-weight:700;margin-top:2px;
}
.faq-item[open] .faq-sign{background:var(--brand-600);color:#fff}
.faq-body{
  padding:0 22px 22px 58px;font-size:15px;line-height:1.8;color:var(--ink-700);
  border-left:3px solid var(--brand-600);margin-left:22px;padding-left:20px;
}

/* ============ CTA / 表单 ============ */
.cta-wrap{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-xl);
  box-shadow:var(--sh-2);overflow:hidden;
  display:grid;grid-template-columns:7fr 5fr;
}
.cta-form{padding:44px}
.cta-form h2{font-size:clamp(22px,2.2vw,28px);font-weight:700;color:var(--ink-900);margin-bottom:10px}
.cta-form .form-sub{font-size:15px;color:var(--ink-500);margin-bottom:28px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.field{margin-bottom:18px}
.field label{display:block;font-size:13px;font-weight:600;color:var(--ink-700);margin-bottom:8px}
.field input,.field select,.field textarea{
  width:100%;border:1px solid var(--line);border-radius:10px;background:#fff;
  padding:0 14px;height:46px;font-size:15px;color:var(--ink-900);
  transition:border-color .18s ease,box-shadow .18s ease;
}
.field textarea{height:120px;padding:12px 14px;resize:vertical;line-height:1.7}
.field input::placeholder,.field textarea::placeholder{color:#9AA5BC}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:none;border-color:var(--brand-500);box-shadow:0 0 0 3px var(--brand-50);
}
.field.has-error input,.field.has-error select,.field.has-error textarea{border-color:var(--error)}
.field .err{display:none;font-size:13px;color:var(--error);margin-top:6px}
.field.has-error .err{display:block}
.form-note{font-size:13px;color:var(--ink-500);margin-top:14px;line-height:1.7}
.form-ok{display:none;margin-top:16px;padding:12px 16px;border-radius:10px;background:#E9F7F1;color:var(--success);font-size:14px;font-weight:500}
.form-ok.show{display:block}
.cta-side{
  background:var(--brand-50);padding:44px 36px;display:flex;flex-direction:column;gap:22px;
}
.cta-side h3{font-size:18px;font-weight:600;color:var(--ink-900)}
.cta-side p{font-size:14px;line-height:1.8;color:var(--ink-700)}
.side-list{display:grid;gap:14px}
.side-list li{display:flex;gap:12px;align-items:flex-start;font-size:14px;color:var(--ink-700);line-height:1.7}
.side-list .ic{
  flex:0 0 30px;width:30px;height:30px;border-radius:9px;background:#fff;
  display:grid;place-items:center;color:var(--brand-600);box-shadow:var(--sh-1);
}
.cta-side .side-media{border-radius:var(--r-md);overflow:hidden;background:#fff;box-shadow:var(--sh-2)}
.cta-side .side-media img{width:100%;aspect-ratio:16/9;object-fit:cover}

/* ============ 页脚 ============ */
.site-footer{background:var(--ink-900);color:rgba(255,255,255,.72);padding:64px 0 24px}
.footer-grid{
  display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px;
  padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.12);
}
.footer-brand{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:700;color:#fff;margin-bottom:14px}
.footer-desc{font-size:14px;line-height:1.85;color:rgba(255,255,255,.72);max-width:340px}
.footer-title{font-size:15px;font-weight:600;color:#fff;margin-bottom:14px}
.footer-link{display:block;font-size:14px;color:rgba(255,255,255,.72);padding:6px 0;transition:color .18s ease,transform .18s ease}
.footer-link:hover{color:var(--brand-500);transform:translateX(2px)}
.footer-bottom{
  display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;
  padding-top:24px;font-size:13px;color:rgba(255,255,255,.55);
}

/* ============ 响应式 ============ */
@media (max-width:1279px){
  .container{max-width:1024px}
  .overview{gap:36px}
  .mega{width:680px}
}
@media (max-width:1023px){
  .section{padding:72px 0}
  .nav-toggle{display:grid}
  .main-nav{
    position:fixed;top:72px;left:0;right:0;bottom:0;
    background:#fff;flex-direction:column;align-items:stretch;gap:0;
    padding:20px 20px 60px;overflow-y:auto;
    transform:translateX(100%);transition:transform .25s ease;z-index:85;
  }
  .main-nav.is-open{transform:translateX(0)}
  .nav-item{width:100%}
  .nav-link{justify-content:space-between;width:100%;padding:14px 4px;font-size:16px;border-radius:0;border-bottom:1px solid var(--line)}
  .nav-link:hover{background:transparent}
  .nav-item.active > .nav-link::after{left:0;right:auto;width:24px;bottom:-1px}
  .mega{
    position:static;width:100%;transform:none;opacity:1;visibility:visible;
    box-shadow:none;border:0;border-radius:0;padding:8px 0 16px;
    display:none;
  }
  .nav-item.has-mega:hover .mega,
  .nav-item.has-mega:focus-within .mega{display:block;transform:none}
  .mega-grid{grid-template-columns:1fr;gap:16px}
  .mega-col{padding:0 !important;border-left:0 !important}
  .header-cta{display:none}
  .overview{grid-template-columns:1fr;gap:44px}
  .float-card{left:16px;bottom:-20px}
  .stats{grid-template-columns:repeat(2,1fr);margin-top:-32px}
  .stat:nth-child(3){border-left:0}
  .stat:nth-child(n+3){border-top:1px solid var(--line)}
  .topic-grid{grid-template-columns:repeat(2,1fr)}
  .tc-b,.tc-c{margin-top:0}
  .check-panel{grid-template-columns:1fr}
  .tip-card{position:static}
  .faq-grid{grid-template-columns:1fr}
  .cta-wrap{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
}
@media (max-width:767px){
  .container{padding:0 16px}
  .section{padding:48px 0}
  .page-hero .container{padding-top:30px;padding-bottom:34px}
  .page-hero .lead{font-size:15px}
  .breadcrumb{font-size:12px;margin-bottom:14px}
  .overview-copy p{font-size:15px}
  .stats{grid-template-columns:repeat(2,1fr)}
  .stat{padding:20px 12px}
  .stat .num{font-size:26px}
  .timeline::before{left:17px}
  .tl-item{padding-left:56px}
  .tl-dot{width:36px;height:36px;font-size:13px}
  .tl-card{padding:18px}
  .topic-grid{grid-template-columns:1fr}
  .topic-body{padding:20px}
  .tc-a .topic-cover img,.tc-b .topic-cover img,.tc-c .topic-cover img{height:190px}
  .step-list{padding:4px 18px}
  .faq-body{padding-left:16px;margin-left:14px}
  .cta-form{padding:26px 20px}
  .cta-side{padding:26px 20px}
  .form-row{grid-template-columns:1fr;gap:0}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}
@media (max-width:480px){
  .topic-body,.tl-card{padding:16px}
  .btn{width:100%}
  .overview-actions .btn{width:100%}
  .overview-actions{flex-direction:column}
  .float-card{position:static;margin-top:16px;left:auto;bottom:auto}
}