/* roulang page: index */
:root{
  --brand:#1557A0;
  --brand-dark:#0B3D73;
  --brand-deep:#0C1F38;
  --teal:#12B39B;
  --accent:#FF6A2B;
  --bg:#F5F8FC;
  --surface:#FFFFFF;
  --line:#E3E9F2;
  --text:#16202E;
  --muted:#5A6675;
  --radius-card:16px;
  --radius-btn:12px;
  --radius-badge:8px;
  --radius-input:10px;
  --shadow-1:0 1px 2px rgba(16,42,74,.06);
  --shadow-2:0 12px 28px -12px rgba(16,42,74,.18);
  --maxw:1200px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  font-size:16px;line-height:1.85;color:var(--text);background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0;font-weight:700;letter-spacing:-.2px}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
time,.num,.stat-value,.progress-value{font-variant-numeric:tabular-nums;font-weight:700}
a:focus-visible,button:focus-visible,summary:focus-visible{outline:2px solid var(--brand);outline-offset:3px;border-radius:8px}
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 20px}
.section{padding:clamp(56px,8vw,96px) 0}
.section-alt{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;letter-spacing:2px;color:var(--brand);text-transform:uppercase}
.eyebrow::before{content:"";width:18px;height:2px;border-radius:2px;background:var(--teal)}
.section-title{font-size:clamp(24px,2.6vw,30px);line-height:1.35;margin:14px 0 12px}
.section-desc{color:var(--muted);font-size:15px;max-width:680px}
.section-head{display:flex;flex-wrap:wrap;gap:16px;align-items:flex-end;justify-content:space-between;margin-bottom:clamp(28px,4vw,44px)}
.link-more{color:var(--brand);font-weight:600;font-size:15px;white-space:nowrap}
.link-more:hover{text-decoration:underline;text-underline-offset:4px}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:var(--radius-btn);font-size:15px;font-weight:600;padding:12px 24px;border:1px solid transparent;cursor:pointer;transition:transform .2s ease,box-shadow .2s ease,background .2s ease,color .2s ease}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 8px 20px -12px rgba(255,106,43,.9)}
.btn-primary:hover{background:#f05f1c;transform:translateY(-2px);box-shadow:0 14px 26px -14px rgba(255,106,43,.95)}
.btn-primary:active{transform:translateY(0)}
.btn-solid{background:var(--brand);color:#fff;box-shadow:var(--shadow-1)}
.btn-solid:hover{background:var(--brand-dark);transform:translateY(-2px);box-shadow:var(--shadow-2)}
.btn-solid:active{transform:translateY(0)}
.btn-ghost{background:#fff;color:var(--brand);border-color:#CBD9EB}
.btn-ghost:hover{border-color:var(--brand);transform:translateY(-2px);box-shadow:var(--shadow-1)}
.btn-sm{padding:9px 18px;font-size:14px;border-radius:10px}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:1030;background:#fff;border-bottom:1px solid var(--line);transition:box-shadow .25s ease}
.site-header.is-stuck{box-shadow:0 10px 26px -18px rgba(16,42,74,.45)}
.nav-wrap{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:12px;height:72px}
.nav-side{display:flex;align-items:center;gap:2px}
.nav-left{justify-self:start}
.nav-right{justify-self:end}
.nav-link{position:relative;padding:8px 12px;font-size:15px;color:var(--muted);border-radius:10px;transition:color .2s,background .2s}
.nav-link:hover{color:var(--brand);background:#EEF4FC}
.nav-link.active{color:var(--brand);font-weight:600}
.nav-link.active::after{content:"";position:absolute;left:12px;right:12px;bottom:1px;height:2px;border-radius:2px;background:var(--brand)}
.brand{display:flex;align-items:center;gap:10px;justify-self:center}
.brand-mark{position:relative;flex:0 0 auto;width:36px;height:36px;border-radius:11px;background:linear-gradient(135deg,var(--brand),var(--brand-dark));box-shadow:var(--shadow-1)}
.brand-mark::after{content:"";position:absolute;left:50%;top:50%;width:18px;height:4px;border-radius:2px;background:#fff;transform:translate(-50%,-50%) skewX(-18deg);box-shadow:0 -7px 0 rgba(255,255,255,.72),0 7px 0 rgba(255,255,255,.72)}
.brand-name{display:block;font-size:17px;font-weight:700;line-height:1.3}
.brand-sub{display:block;font-size:11px;color:var(--muted);letter-spacing:3px;line-height:1.4}
.nav-toggle{width:44px;height:44px;border:1px solid var(--line);border-radius:10px;background:#fff;display:inline-flex;flex-direction:column;justify-content:center;align-items:center;gap:4px;padding:0}
.nav-toggle span{display:block;width:18px;height:2px;border-radius:2px;background:var(--brand-dark)}
.mobile-panel{border-top:1px solid var(--line);background:#fff;padding:12px 0 20px}
.mobile-panel .m-link{display:block;line-height:48px;padding:0 4px;font-size:16px;color:var(--text);border-bottom:1px solid var(--line)}
.mobile-panel .m-link.active{color:var(--brand);font-weight:600}
.mobile-panel .btn{width:100%;margin-top:16px}
.dropdown-menu{border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow-2);padding:8px;min-width:190px}
.dropdown-item{border-radius:8px;font-size:15px;padding:9px 12px;color:var(--muted)}
.dropdown-item:hover{background:#EEF4FC;color:var(--brand)}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;background:linear-gradient(180deg,#fff 0%,#F5F8FC 100%);padding:clamp(40px,6vw,84px) 0 clamp(48px,7vw,92px)}
.hero::before{content:"";position:absolute;inset:0;background-image:repeating-linear-gradient(-18deg,rgba(21,87,160,.04) 0 2px,transparent 2px 24px);pointer-events:none}
.hero .wrap{position:relative;z-index:1}
.hero-badge{display:inline-flex;align-items:center;gap:8px;background:#EEF4FC;color:var(--brand);font-size:13px;font-weight:600;padding:6px 14px;border-radius:var(--radius-badge)}
.hero-title{font-size:clamp(28px,4vw,42px);line-height:1.25;font-weight:700;margin:20px 0 18px}
.hero-sub{font-size:17px;color:var(--muted);max-width:560px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin:28px 0 18px}
.hero-note{font-size:13px;color:var(--muted);display:flex;align-items:center;gap:8px}
.hero-note::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--teal);flex:0 0 auto}
.hero-media{position:relative}
.hero-media img{width:100%;aspect-ratio:16/10;object-fit:cover;border-radius:20px;box-shadow:var(--shadow-2)}
.float-card{position:absolute;right:-6px;bottom:-24px;width:min(260px,80%);background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);box-shadow:var(--shadow-2);padding:16px 18px}
.float-card .fc-label{font-size:13px;color:var(--muted)}
.float-card .fc-value{font-size:22px;font-weight:700;color:var(--brand-dark);line-height:1.4}
.float-bar{height:8px;border-radius:99px;background:var(--line);overflow:hidden;margin-top:10px}
.float-bar i{display:block;height:100%;width:72%;border-radius:99px;background:linear-gradient(90deg,var(--brand),var(--teal))}

/* ---------- feature rows ---------- */
.feature-row{display:grid;grid-template-columns:1fr 1fr;gap:clamp(24px,4vw,56px);align-items:center;margin-top:clamp(32px,4vw,56px)}
.feature-row:first-of-type{margin-top:0}
.feature-row.reverse .feature-media{order:2}
.feature-media img{width:100%;aspect-ratio:16/11;object-fit:cover;border-radius:var(--radius-card);box-shadow:var(--shadow-1)}
.feature-num{font-size:56px;font-weight:700;line-height:1;color:transparent;-webkit-text-stroke:1.5px rgba(21,87,160,.28);letter-spacing:-2px}
.feature-body h3{font-size:20px;margin:10px 0 14px}
.feature-body p{color:var(--muted);font-size:15.5px}
.check-list{margin-top:18px;display:grid;gap:10px}
.check-list li{position:relative;padding-left:26px;font-size:15px;color:var(--text)}
.check-list li::before{content:"";position:absolute;left:0;top:10px;width:12px;height:12px;border-radius:4px;background:#E4F4F1;box-shadow:inset 0 0 0 2px var(--teal)}

/* ---------- reward strip ---------- */
.strip-scroll{display:flex;gap:20px;overflow-x:auto;padding:6px 4px 22px;scroll-snap-type:x mandatory}
.strip-scroll::-webkit-scrollbar{height:8px}
.strip-scroll::-webkit-scrollbar-thumb{background:#CBD9EB;border-radius:99px}
.strip-scroll::-webkit-scrollbar-track{background:#EEF2F8;border-radius:99px}
.reward-card{flex:0 0 clamp(240px,28vw,300px);scroll-snap-align:start;background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);overflow:hidden;box-shadow:var(--shadow-1);transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease}
.reward-card:hover{transform:translateY(-3px);border-color:rgba(21,87,160,.25);box-shadow:var(--shadow-2)}
.reward-card img{width:100%;aspect-ratio:16/9;object-fit:cover}
.reward-body{padding:18px 20px 20px}
.reward-body h3{font-size:17px;margin-bottom:8px}
.reward-body p{font-size:14px;color:var(--muted);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.reward-tag{display:inline-block;font-size:12px;font-weight:600;color:var(--brand);background:#EEF4FC;border-radius:var(--radius-badge);padding:3px 10px;margin-bottom:10px}

/* ---------- progress ---------- */
.progress-panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);padding:clamp(20px,3vw,32px);box-shadow:var(--shadow-1)}
.progress-item + .progress-item{margin-top:22px}
.progress-top{display:flex;justify-content:space-between;align-items:baseline;gap:12px;font-size:15px;margin-bottom:10px}
.progress-value{color:var(--brand-dark)}
.progress-track{height:8px;border-radius:99px;background:var(--line);overflow:hidden}
.progress-fill{position:relative;height:100%;border-radius:99px;background:linear-gradient(90deg,var(--brand),var(--teal))}
.progress-fill::after{content:"";position:absolute;right:0;top:50%;width:6px;height:6px;border-radius:50%;background:#fff;transform:translateY(-50%);box-shadow:0 0 0 3px rgba(18,179,155,.22)}
.combo-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:10px;margin-top:8px}
.combo-cell{aspect-ratio:1/1;border-radius:10px;border:1px solid var(--line);background:#F5F8FC;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;color:#A9B6C7}
.combo-cell.on{background:#E4F4F1;border-color:rgba(18,179,155,.35);color:#0E8C7A}
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.stat-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);padding:22px 20px;box-shadow:var(--shadow-1);transition:transform .25s ease,box-shadow .25s ease}
.stat-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-2)}
.stat-num{font-size:15px;font-weight:700;color:rgba(21,87,160,.45);letter-spacing:1px}
.stat-value{font-size:22px;color:var(--brand-dark);margin:8px 0 6px}
.stat-label{font-size:14px;color:var(--muted)}

/* ---------- cta band ---------- */
.cta-band{position:relative;overflow:hidden;border-radius:20px;padding:clamp(32px,5vw,56px);background:linear-gradient(135deg,var(--brand-dark),var(--brand));color:#fff}
.cta-band::before{content:"";position:absolute;inset:0;background-image:url('/assets/images/backpic/back-1.webp');background-size:cover;background-position:center;opacity:.14}
.cta-band::after{content:"";position:absolute;inset:0;background-image:repeating-linear-gradient(-18deg,rgba(255,255,255,.04) 0 2px,transparent 2px 26px)}
.cta-inner{position:relative;z-index:1;display:flex;flex-wrap:wrap;gap:24px;align-items:center;justify-content:space-between}
.cta-inner h2{font-size:clamp(22px,2.6vw,30px);line-height:1.4;color:#fff}
.cta-inner p{color:rgba(255,255,255,.82);font-size:15px;margin-top:10px;max-width:620px}

/* ---------- news ---------- */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.news-card{display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);overflow:hidden;box-shadow:var(--shadow-1);transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease}
.news-card:hover{transform:translateY(-3px);border-color:rgba(21,87,160,.25);box-shadow:var(--shadow-2)}
.news-thumb{position:relative}
.news-thumb img{width:100%;aspect-ratio:16/9;object-fit:cover}
.badge-cat{position:absolute;left:12px;top:12px;background:rgba(11,61,115,.86);color:#fff;font-size:12px;font-weight:600;padding:4px 10px;border-radius:var(--radius-badge);backdrop-filter:blur(2px)}
.news-body{padding:18px 20px 20px;display:flex;flex-direction:column;flex:1}
.news-body h3{font-size:17px;line-height:1.5;margin-bottom:10px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-body p{font-size:14px;color:var(--muted);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-meta{margin-top:auto;padding-top:16px;display:flex;align-items:center;justify-content:space-between;font-size:13px;color:var(--muted);border-top:1px solid var(--line)}
.news-meta .arrow{color:var(--brand);font-weight:700;transition:transform .2s ease}
.news-card:hover .arrow{transform:translateX(4px)}
.empty-state{grid-column:1/-1;min-height:180px;border:1px dashed #C9D6E8;border-radius:var(--radius-card);background:#fff;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;color:var(--muted);font-size:15px;text-align:center;padding:24px}
.empty-state .dot{width:34px;height:34px;border-radius:12px;background:#EEF4FC;display:flex;align-items:center;justify-content:center;color:var(--brand);font-weight:700}

/* ---------- faq ---------- */
.faq-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px 24px;align-items:start}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:var(--radius-card);padding:0 22px;box-shadow:var(--shadow-1);transition:border-color .2s ease,background .2s ease}
.faq-item[open]{background:#EEF4FC;border-color:rgba(21,87,160,.22)}
.faq-item summary{position:relative;list-style:none;cursor:pointer;padding:18px 30px 18px 16px;font-size:16px;font-weight:600;line-height:1.6}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::before{content:"";position:absolute;left:0;top:20px;width:3px;height:22px;border-radius:3px;background:var(--teal)}
.faq-item summary::after{content:"";position:absolute;right:6px;top:24px;width:8px;height:8px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:rotate(45deg);transition:transform .2s ease}
.faq-item[open] summary::after{transform:rotate(-135deg);top:28px}
.faq-a{padding:0 6px 20px 16px;font-size:15px;color:var(--muted)}

/* ---------- footer ---------- */
.site-footer{background:var(--brand-deep);color:#B9C7DA;padding:clamp(44px,6vw,72px) 0 0;margin-top:clamp(56px,8vw,96px)}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:32px}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.footer-brand .brand-mark{box-shadow:none}
.footer-brand strong{color:#fff;font-size:17px}
.site-footer p{font-size:14px;line-height:1.9}
.site-footer h4{color:#fff;font-size:15px;margin-bottom:16px;letter-spacing:.5px}
.footer-links li{margin-bottom:10px}
.footer-links a{font-size:14px;color:#B9C7DA;transition:color .2s ease}
.footer-links a:hover{color:#fff}
.footer-bottom{margin-top:clamp(32px,4vw,48px);border-top:1px solid rgba(255,255,255,.12);padding:20px 0;display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;font-size:13px;color:#8FA2BA}

/* ---------- responsive ---------- */
@media (max-width:1199px){
  .nav-link{padding:8px 9px;font-size:14px}
  .news-grid{gap:18px}
}
@media (max-width:991px){
  .nav-wrap{height:60px;grid-template-columns:44px 1fr 44px}
  .brand{justify-self:center}
  .brand-name{font-size:15px}
  .brand-sub{display:none}
  .hero-media{margin-top:36px}
  .float-card{right:12px;bottom:-18px}
  .feature-row{grid-template-columns:1fr;gap:24px}
  .feature-row.reverse .feature-media{order:0}
  .stat-grid{grid-template-columns:repeat(2,1fr)}
  .news-grid{grid-template-columns:1fr 1fr}
  .faq-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
}
@media (max-width:767px){
  .section{padding:40px 0}
  .hero{padding:32px 0 48px}
  .hero-actions .btn{width:100%}
  .hero-title{font-size:clamp(24px,7vw,32px)}
  .combo-grid{grid-template-columns:repeat(5,1fr)}
  .news-grid{grid-template-columns:1fr}
  .cta-inner{flex-direction:column;align-items:flex-start}
  .cta-inner .btn{width:100%}
  .stat-grid{grid-template-columns:1fr 1fr;gap:14px}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column}
}
@media (max-width:520px){
  .wrap{padding:0 16px}
  .reward-card{flex:0 0 82vw}
  .stat-grid{grid-template-columns:1fr}
  .combo-grid{grid-template-columns:repeat(4,1fr)}
}

/* roulang page: article */
:root{
  --primary:#1557A0;
  --primary-deep:#0B3D73;
  --primary-soft:#E8F0FA;
  --teal:#12B39B;
  --orange:#FF6A2B;
  --bg:#F5F8FC;
  --card:#FFFFFF;
  --line:#E3E9F2;
  --line-strong:#D8E2EF;
  --text:#16202E;
  --muted:#5A6675;
  --r-card:16px;
  --r-btn:12px;
  --r-badge:8px;
  --r-input:10px;
  --sh-1:0 1px 2px rgba(16,42,74,.06);
  --sh-2:0 12px 28px -12px rgba(16,42,74,.18);
  --gap:24px;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  font-size:16px;
  line-height:1.85;
  color:var(--text);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block;}
a{color:var(--primary);text-decoration:none;transition:color .2s ease,background .2s ease,border-color .2s ease,transform .2s ease;}
a:hover{color:var(--primary-deep);}
h1,h2,h3,h4{margin:0;font-weight:700;line-height:1.4;color:var(--text);}
p{margin:0 0 14px;}
ul,ol{margin:0;padding:0;}
button{font-family:inherit;}
table{border-collapse:collapse;}
.num{font-variant-numeric:tabular-nums;font-weight:700;}
.wrap{width:100%;max-width:1200px;margin:0 auto;padding:0 20px;}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px;}
::selection{background:rgba(21,87,160,.16);}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:1030;background:#fff;border-bottom:1px solid var(--line);transition:box-shadow .25s ease;}
.site-header.is-stuck{box-shadow:0 8px 22px -16px rgba(16,42,74,.45);}
.header-inner{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:16px;height:72px;}
.nav-side{display:flex;align-items:center;gap:26px;}
.nav-left{justify-self:start;}
.nav-right{justify-self:end;}
.nav-link{position:relative;font-size:15px;color:var(--muted);padding:6px 2px;}
.nav-link:hover{color:var(--primary);}
.nav-link.active{color:var(--primary);font-weight:600;}
.nav-link.active::after{content:"";position:absolute;left:0;right:0;bottom:-4px;height:3px;border-radius:2px;background:var(--primary);}
.nav-cta{display:inline-flex;align-items:center;height:38px;padding:0 18px;border-radius:var(--r-btn);background:var(--orange);color:#fff;font-size:14px;font-weight:600;box-shadow:0 10px 20px -12px rgba(255,106,43,.85);}
.nav-cta:hover{background:#F05515;color:#fff;transform:translateY(-2px);}
.brand{display:flex;align-items:center;gap:10px;justify-self:center;color:var(--text);}
.brand-mark{position:relative;width:36px;height:36px;border-radius:10px;flex:none;background:linear-gradient(135deg,var(--primary),var(--primary-deep));box-shadow:var(--sh-1);}
.brand-mark::before{content:"";position:absolute;inset:9px;background:#fff;border-radius:3px;transform:skewX(-18deg);}
.brand-text{display:flex;flex-direction:column;line-height:1.25;}
.brand-text strong{font-size:17px;font-weight:700;letter-spacing:.2px;}
.brand-text small{font-size:11px;color:var(--muted);letter-spacing:.4px;}
.nav-toggle{justify-self:end;width:42px;height:42px;border-radius:10px;border:1px solid var(--line);background:#fff;display:inline-flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;cursor:pointer;}
.nav-toggle span{width:18px;height:2px;border-radius:2px;background:var(--primary-deep);transition:transform .25s ease,opacity .25s ease;}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(6px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}
.mobile-panel{display:none;background:#fff;border-top:1px solid var(--line);}
.mobile-panel.open{display:block;}
.mobile-panel .wrap{display:flex;flex-direction:column;padding-top:8px;padding-bottom:18px;}
.m-link{display:flex;align-items:center;height:48px;font-size:16px;color:var(--text);border-bottom:1px solid var(--line);}
.m-link.active{color:var(--primary);font-weight:600;}
.m-cta{margin-top:14px;display:flex;align-items:center;justify-content:center;height:48px;border-radius:var(--r-btn);background:var(--orange);color:#fff;font-weight:600;}
.m-cta:hover{background:#F05515;color:#fff;}

/* ---------- page hero ---------- */
.page-hero{position:relative;overflow:hidden;background:var(--primary-deep);}
.page-hero::before{content:"";position:absolute;inset:0;background:url('/assets/images/backpic/back-1.webp') center/cover no-repeat;opacity:.3;}
.page-hero::after{content:"";position:absolute;inset:0;background:linear-gradient(102deg,rgba(11,61,115,.94),rgba(21,87,160,.72));}
.page-hero-inner{position:relative;z-index:2;padding:38px 0 34px;}
.crumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:rgba(255,255,255,.72);}
.crumb a{color:rgba(255,255,255,.88);}
.crumb a:hover{color:#fff;text-decoration:underline;text-underline-offset:3px;}
.crumb .sep{opacity:.5;}
.crumb .current{color:#fff;max-width:48ch;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.hero-chip{display:inline-flex;align-items:center;gap:8px;height:30px;padding:0 14px;margin-top:18px;border-radius:var(--r-badge);background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.32);color:#fff;font-size:13px;}
.hero-chip i{color:#7FE3D3;}

/* ---------- sections ---------- */
.section{padding:clamp(40px,6vw,72px) 0;}
.section-head{max-width:720px;margin:0 auto clamp(24px,3vw,40px);text-align:center;}
.section-head h2{font-size:clamp(22px,3vw,28px);margin-bottom:10px;}
.section-head p{margin:0;font-size:15px;color:var(--muted);}
.section-head.left{margin:0 0 28px;text-align:left;}

/* ---------- article ---------- */
.article-shell{max-width:780px;margin:0 auto;}
.article-head{padding-bottom:22px;margin-bottom:26px;border-bottom:1px solid var(--line);}
.article-head h1{font-size:clamp(26px,3.6vw,34px);line-height:1.35;margin-bottom:16px;}
.article-meta{display:flex;flex-wrap:wrap;align-items:center;gap:12px;font-size:13px;color:var(--muted);}
.article-meta .dot{width:4px;height:4px;border-radius:50%;background:#C6D2E2;}
.article-meta i{color:var(--primary);margin-right:5px;}
.article-content{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-card);
  padding:clamp(22px,3.2vw,40px);box-shadow:var(--sh-1);
  font-size:16px;line-height:1.9;
}
.article-content > *:first-child{margin-top:0;}
.article-content > *:last-child{margin-bottom:0;}
.article-content h2{font-size:23px;line-height:1.45;margin:34px 0 14px;padding-left:14px;border-left:4px solid var(--primary);}
.article-content h3{font-size:19px;margin:26px 0 10px;}
.article-content h4{font-size:17px;margin:22px 0 8px;}
.article-content p{margin:0 0 16px;color:#22303F;}
.article-content ul,.article-content ol{margin:0 0 18px;padding-left:22px;}
.article-content li{margin-bottom:8px;}
.article-content ul{list-style:none;padding-left:20px;}
.article-content ul li{position:relative;}
.article-content ul li::before{content:"";position:absolute;left:-15px;top:11px;width:6px;height:6px;border-radius:50%;background:var(--teal);}
.article-content ol{list-style:decimal;}
.article-content ol li::marker{color:var(--primary);font-weight:700;}
.article-content blockquote{margin:22px 0;padding:16px 20px;border-left:4px solid var(--teal);background:#EDF8F6;border-radius:0 12px 12px 0;color:#25514B;font-size:15px;}
.article-content img{border-radius:12px;margin:18px auto;}
.article-content figure{margin:22px 0;}
.article-content figcaption{font-size:13px;color:var(--muted);text-align:center;margin-top:8px;line-height:1.7;}
.article-content table{display:block;width:100%;max-width:100%;overflow-x:auto;margin:20px 0;font-size:15px;}
.article-content th,.article-content td{border:1px solid var(--line);padding:10px 14px;text-align:left;white-space:nowrap;}
.article-content th{background:var(--primary-soft);color:var(--primary-deep);font-weight:600;}
.article-content a{color:var(--primary);text-decoration:underline;text-underline-offset:3px;}
.article-content code{background:#EEF2F8;padding:2px 6px;border-radius:6px;font-size:14px;}
.article-content hr{border:0;border-top:1px solid var(--line);margin:28px 0;}

.empty-state{background:#fff;border:1px dashed #C9D6E6;border-radius:var(--r-card);padding:56px 24px;text-align:center;box-shadow:var(--sh-1);}
.empty-state i{font-size:34px;color:var(--primary);}
.empty-state h2{font-size:22px;margin:14px 0 8px;}
.empty-state p{margin:0 auto 22px;max-width:44ch;font-size:15px;color:var(--muted);}

/* ---------- buttons ---------- */
.btn-main,.btn-line{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:48px;padding:0 26px;border-radius:var(--r-btn);font-size:15px;font-weight:600;transition:transform .22s ease,box-shadow .22s ease,background .22s ease,color .22s ease,border-color .22s ease;}
.btn-main{background:var(--primary);color:#fff;border:1px solid var(--primary);box-shadow:var(--sh-1);}
.btn-main:hover{background:#12488A;border-color:#12488A;color:#fff;transform:translateY(-2px);box-shadow:var(--sh-2);}
.btn-main:active{transform:translateY(0);}
.btn-line{background:#fff;color:var(--primary);border:1px solid rgba(21,87,160,.35);}
.btn-line:hover{border-color:var(--primary);background:var(--primary-soft);color:var(--primary-deep);transform:translateY(-2px);}
.btn-line:active{transform:translateY(0);}
.btn-on-dark{background:#fff;color:var(--primary-deep);border:1px solid #fff;}
.btn-on-dark:hover{background:#EAF2FB;color:var(--primary-deep);transform:translateY(-2px);box-shadow:0 14px 26px -16px rgba(0,0,0,.55);}
.btn-ghost-dark{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.55);}
.btn-ghost-dark:hover{background:rgba(255,255,255,.12);color:#fff;transform:translateY(-2px);}

/* ---------- article actions ---------- */
.article-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px;padding-top:24px;border-top:1px solid var(--line);}

/* ---------- related cards ---------- */
.rec-card{display:flex;flex-direction:column;height:100%;overflow:hidden;background:#fff;border:1px solid var(--line);border-radius:var(--r-card);box-shadow:var(--sh-1);color:var(--text);transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;}
.rec-card:hover{transform:translateY(-3px);border-color:rgba(21,87,160,.35);box-shadow:var(--sh-2);color:var(--text);}
.rec-thumb{display:block;aspect-ratio:16/9;overflow:hidden;background:var(--primary-soft);}
.rec-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .45s ease;}
.rec-card:hover .rec-thumb img{transform:scale(1.04);}
.rec-body{display:block;padding:16px 18px 20px;}
.chip{display:inline-block;font-size:12px;line-height:1;color:var(--primary);background:var(--primary-soft);border-radius:var(--r-badge);padding:6px 10px;margin-bottom:10px;}
.rec-title{display:block;font-size:16px;font-weight:600;line-height:1.55;margin-bottom:6px;}
.rec-desc{display:block;font-size:13px;line-height:1.7;color:var(--muted);}

/* ---------- faq ---------- */
.faq-list{display:grid;gap:12px;max-width:860px;margin:0 auto;}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;transition:background .2s ease,border-color .2s ease;}
.faq-item[open]{background:#EEF4FC;border-color:rgba(21,87,160,.25);}
.faq-item summary{display:flex;align-items:center;gap:12px;padding:16px 18px;cursor:pointer;list-style:none;font-size:16px;font-weight:600;color:var(--text);}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary .bar{width:3px;align-self:stretch;min-height:20px;border-radius:3px;background:var(--teal);flex:none;}
.faq-item summary .q{flex:1;}
.faq-arrow{flex:none;width:10px;height:10px;margin-right:4px;border-right:2px solid var(--primary);border-bottom:2px solid var(--primary);transform:rotate(45deg);transition:transform .25s ease;}
.faq-item[open] .faq-arrow{transform:rotate(-135deg);}
.faq-body{padding:0 18px 18px 33px;font-size:15px;line-height:1.8;color:var(--muted);}
.faq-body p:last-child{margin-bottom:0;}

/* ---------- cta band ---------- */
.cta-band{position:relative;overflow:hidden;background:linear-gradient(115deg,var(--primary-deep),var(--primary));border-radius:20px;padding:clamp(28px,4vw,44px);color:#fff;box-shadow:var(--sh-2);}
.cta-band::before{content:"";position:absolute;inset:0;background-image:repeating-linear-gradient(-18deg,rgba(255,255,255,.04) 0 2px,transparent 2px 16px);}
.cta-band .inner{position:relative;z-index:2;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:22px;}
.cta-band h2{color:#fff;font-size:clamp(20px,2.6vw,26px);margin-bottom:8px;}
.cta-band p{margin:0;max-width:52ch;font-size:14px;line-height:1.8;color:rgba(255,255,255,.84);}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px;}

/* ---------- footer ---------- */
.site-footer{margin-top:clamp(40px,6vw,72px);padding-top:clamp(40px,6vw,64px);background:#0C1F38;color:#B9C7DA;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:32px;}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:14px;}
.footer-brand .brand-mark{width:32px;height:32px;border-radius:9px;}
.footer-brand .brand-mark::before{inset:8px;}
.footer-brand strong{color:#fff;font-size:16px;}
.site-footer h4{color:#fff;font-size:15px;margin-bottom:14px;}
.site-footer p{font-size:13px;line-height:1.8;margin:0;}
.footer-links{list-style:none;margin:0;padding:0;}
.footer-links li{margin-bottom:10px;}
.footer-links a{font-size:14px;color:#B9C7DA;}
.footer-links a:hover{color:#fff;}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;margin-top:36px;padding:18px 0;border-top:1px solid rgba(255,255,255,.12);font-size:13px;color:#8FA3BE;}

/* ---------- responsive ---------- */
@media (max-width:1199.98px){
  .nav-side{gap:18px;}
  .header-inner{gap:12px;}
}
@media (max-width:991.98px){
  .header-inner{height:60px;}
  .brand-text strong{font-size:16px;}
  .brand-text small{display:none;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:26px;}
}
@media (max-width:767.98px){
  body{font-size:15px;}
  .section{padding:40px 0;}
  .page-hero-inner{padding:26px 0 22px;}
  .crumb .current{max-width:100%;white-space:normal;overflow:visible;}
  .article-content{padding:20px 16px;}
  .article-content h2{font-size:20px;}
  .article-actions .btn-main,.article-actions .btn-line{width:100%;}
  .cta-actions{width:100%;}
  .cta-actions a{width:100%;}
  .footer-grid{grid-template-columns:1fr;gap:24px;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
}

/* roulang page: category1 */
:root{
  --brand:#1557A0;
  --brand-deep:#0B3D73;
  --brand-soft:#EEF4FC;
  --accent:#12B39B;
  --hot:#FF6A2B;
  --bg:#F5F8FC;
  --card:#FFFFFF;
  --line:#E3E9F2;
  --text:#16202E;
  --muted:#5A6675;
  --r-card:16px;
  --r-btn:12px;
  --r-badge:8px;
  --r-input:10px;
  --sh-1:0 1px 2px rgba(16,42,74,.06);
  --sh-2:0 12px 28px -12px rgba(16,42,74,.18);
  --sec-pad:clamp(56px,8vw,96px);
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  background:var(--bg);
  color:var(--text);
  font-size:16px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border:0;}
a{color:var(--brand);text-decoration:none;transition:color .2s;}
a:hover{color:var(--brand-deep);}
p{margin:0 0 14px;}
ul,ol{margin:0;padding:0;}
h1,h2,h3,h4{margin:0;font-weight:700;color:var(--text);letter-spacing:.2px;}
button{font-family:inherit;}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px;}
.num,.tabular{font-variant-numeric:tabular-nums;}
.wrap{width:100%;max-width:1200px;margin:0 auto;padding:0 20px;}
.section{padding:var(--sec-pad) 0;}
.section-white{background:#fff;}
.section-tight{padding-top:clamp(36px,5vw,56px);}
.section-head{max-width:780px;margin-bottom:clamp(28px,4vw,44px);}
.section-head p{color:var(--muted);font-size:15px;margin:0;}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;font-weight:600;color:var(--brand);
  background:var(--brand-soft);border-radius:var(--r-badge);
  padding:6px 12px;letter-spacing:.4px;
}
.eyebrow::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--accent);}
.eyebrow.on-dark{background:rgba(255,255,255,.14);color:#fff;}
.eyebrow.on-dark::before{background:var(--accent);}
h2.section-title{font-size:clamp(22px,2.6vw,30px);line-height:1.35;margin:14px 0 12px;}
.lead-text{font-size:16px;color:var(--muted);line-height:1.85;}

/* ---------- 按钮 ---------- */
.btn-x{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border-radius:var(--r-btn);padding:12px 22px;font-size:15px;font-weight:600;
  border:1px solid transparent;cursor:pointer;line-height:1.4;
  transition:transform .2s,box-shadow .2s,background-color .2s,color .2s,border-color .2s;
}
.btn-hot{background:var(--hot);color:#fff;box-shadow:0 10px 20px -12px rgba(255,106,43,.75);}
.btn-hot:hover{background:#ef5c18;color:#fff;transform:translateY(-2px);box-shadow:0 16px 26px -14px rgba(255,106,43,.85);}
.btn-hot:active{transform:translateY(0);box-shadow:0 6px 14px -10px rgba(255,106,43,.8);}
.btn-line{background:rgba(255,255,255,.08);color:#fff;border-color:rgba(255,255,255,.6);}
.btn-line:hover{background:#fff;color:var(--brand-deep);border-color:#fff;transform:translateY(-2px);}
.btn-ghost{background:#fff;color:var(--brand);border-color:#cfdcee;}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand-deep);transform:translateY(-2px);box-shadow:var(--sh-2);}
.btn-arrow::after{content:"";width:7px;height:7px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(-45deg);margin-left:2px;margin-top:-2px;}
.nav-cta{padding:9px 16px;font-size:14px;border-radius:10px;}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:1040;background:#fff;
  border-bottom:1px solid var(--line);
  transition:box-shadow .25s;
}
.site-header.is-scrolled{box-shadow:0 10px 30px -22px rgba(16,42,74,.6);}
.header-inner{
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;
  min-height:72px;gap:12px;
}
.nav-side{display:flex;align-items:center;gap:2px;}
.nav-right{justify-content:flex-end;gap:10px;}
.nav-link{
  font-size:14px;font-weight:500;color:var(--text);
  padding:9px 13px;border-radius:10px;
  transition:background-color .2s,color .2s;
}
.nav-link:hover{background:var(--brand-soft);color:var(--brand);}
.nav-link.active{background:var(--brand-soft);color:var(--brand);font-weight:700;}
.nav-drop .dropdown-toggle::after{
  display:inline-block;vertical-align:middle;margin-left:6px;
  content:"";width:6px;height:6px;border-right:1.6px solid currentColor;border-bottom:1.6px solid currentColor;
  transform:rotate(45deg) translateY(-2px);
  border-top:0;border-left:0;
}
.nav-menu{
  border:1px solid var(--line);border-radius:14px;box-shadow:var(--sh-2);
  padding:8px;min-width:190px;margin-top:10px;
}
.nav-menu .dropdown-item{font-size:14px;border-radius:9px;padding:9px 12px;color:var(--text);}
.nav-menu .dropdown-item:hover{background:var(--brand-soft);color:var(--brand);}
.brand{display:inline-flex;align-items:center;gap:10px;justify-self:center;color:var(--text);}
.brand:hover{color:var(--text);}
.brand-mark{
  width:34px;height:34px;border-radius:10px;flex:none;position:relative;
  background:linear-gradient(135deg,var(--brand),var(--brand-deep));
  box-shadow:var(--sh-1);
}
.brand-mark::before{
  content:"";position:absolute;left:9px;top:9px;width:16px;height:5px;border-radius:3px;
  background:var(--accent);transform:skewX(-18deg);
}
.brand-mark::after{
  content:"";position:absolute;left:9px;top:19px;width:10px;height:5px;border-radius:3px;
  background:rgba(255,255,255,.8);transform:skewX(-18deg);
}
.brand-text{display:flex;flex-direction:column;line-height:1.15;}
.brand-text strong{font-size:15px;font-weight:700;letter-spacing:.2px;}
.brand-text em{font-style:normal;font-size:11px;color:var(--muted);letter-spacing:.6px;}
.menu-toggle{
  width:42px;height:42px;border:1px solid var(--line);border-radius:10px;background:#fff;
  display:inline-flex;align-items:center;justify-content:center;cursor:pointer;
}
.menu-toggle i{display:block;width:18px;height:2px;background:var(--brand-deep);position:relative;}
.menu-toggle i::before,.menu-toggle i::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:var(--brand-deep);
}
.menu-toggle i::before{top:-6px;}
.menu-toggle i::after{top:6px;}
.mobile-panel{display:none;background:#fff;border-top:1px solid var(--line);padding:6px 0 16px;}
.mobile-panel.open{display:block;}
.mobile-panel a{
  display:block;padding:13px 20px;font-size:15px;color:var(--text);
  border-bottom:1px solid var(--line);line-height:1.6;
}
.mobile-panel a:hover{background:var(--brand-soft);color:var(--brand);}
.mobile-panel a.active{color:var(--brand);font-weight:700;background:var(--brand-soft);}
.mobile-panel .mobile-cta{margin:16px 20px 0;display:flex;}
.mobile-panel .mobile-cta .btn-x{width:100%;}

/* ---------- 分类页头图 ---------- */
.cat-hero{
  position:relative;overflow:hidden;color:#fff;
  padding:clamp(40px,6vw,72px) 0 clamp(52px,7vw,84px);
  background:linear-gradient(158deg,rgba(11,61,115,.95) 0%,rgba(21,87,160,.86) 100%),
             url('/assets/images/backpic/back-2.png') center/cover no-repeat;
}
.cat-hero::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(-18deg,rgba(255,255,255,.04) 0 2px,transparent 2px 15px);
}
.cat-hero .wrap{position:relative;z-index:1;}
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:rgba(255,255,255,.78);margin-bottom:20px;}
.crumbs a{color:rgba(255,255,255,.92);}
.crumbs a:hover{color:#fff;text-decoration:underline;text-underline-offset:3px;}
.crumbs span.sep{opacity:.55;}
.cat-hero h1{
  color:#fff;font-size:clamp(28px,4vw,42px);line-height:1.25;font-weight:700;
  max-width:20em;
}
.cat-hero .hero-sub{
  margin:16px 0 0;max-width:640px;font-size:16px;line-height:1.85;
  color:rgba(255,255,255,.9);
}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px;}
.hero-tags span{
  font-size:13px;padding:7px 13px;border-radius:var(--r-badge);
  background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.22);
  color:#fff;letter-spacing:.3px;
}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px;}
.hero-note{
  margin-top:18px;font-size:13px;color:rgba(255,255,255,.78);
  display:flex;align-items:center;gap:8px;
}
.hero-note::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--accent);flex:none;}

/* ---------- 图文模块 ---------- */
.feature-row{
  display:grid;grid-template-columns:1fr 1fr;
  gap:clamp(28px,4vw,56px);align-items:center;
  padding:clamp(22px,3vw,34px) 0;
}
.feature-row + .feature-row{border-top:1px dashed var(--line);}
.feature-media{
  margin:0;border-radius:20px;overflow:hidden;background:#dde7f3;
  box-shadow:var(--sh-2);
}
.feature-media img{width:100%;aspect-ratio:16/10;object-fit:cover;transition:transform .45s ease;}
.feature-media:hover img{transform:scale(1.03);}
.feature-row.reverse .feature-media{order:2;}
.feature-body h2{font-size:clamp(20px,2.2vw,26px);line-height:1.35;margin:10px 0 12px;}
.feature-body p{color:var(--muted);font-size:15px;margin:0;}
.step-num{
  display:block;font-size:40px;font-weight:700;line-height:1;
  color:transparent;-webkit-text-stroke:1px rgba(21,87,160,.42);
  letter-spacing:2px;font-variant-numeric:tabular-nums;
}
.tick-list{list-style:none;display:grid;gap:10px;margin-top:18px;}
.tick-list li{position:relative;padding-left:22px;font-size:15px;color:var(--text);}
.tick-list li::before{
  content:"";position:absolute;left:0;top:.66em;width:8px;height:8px;border-radius:3px;
  background:var(--accent);transform:rotate(45deg);
}

/* ---------- 要点清单 ---------- */
.points{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.point{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r-card);
  padding:24px 22px;box-shadow:var(--sh-1);
  transition:transform .25s,box-shadow .25s,border-color .25s;
}
.point:hover{transform:translateY(-3px);box-shadow:var(--sh-2);border-color:rgba(21,87,160,.35);}
.point .idx{
  font-size:26px;font-weight:700;line-height:1;font-variant-numeric:tabular-nums;
  color:transparent;-webkit-text-stroke:1px rgba(21,87,160,.45);
}
.point h3{font-size:17px;margin:12px 0 8px;}
.point p{font-size:14px;color:var(--muted);margin:0;}

/* ---------- 术语速查 ---------- */
.tag-cloud{display:flex;flex-wrap:wrap;gap:10px;}
.tag{
  display:inline-flex;align-items:center;gap:8px;background:#fff;border:1px solid var(--line);
  border-radius:var(--r-badge);padding:9px 14px;font-size:14px;color:var(--brand-deep);
  box-shadow:var(--sh-1);transition:transform .2s,border-color .2s,color .2s;
}
.tag:hover{transform:translateY(-2px);border-color:rgba(21,87,160,.4);color:var(--brand);}
.tag b{font-weight:700;color:var(--accent);font-variant-numeric:tabular-nums;}
.tag-note{margin-top:18px;font-size:13px;color:var(--muted);}

/* ---------- FAQ ---------- */
.faq-accordion{max-width:900px;}
.faq-accordion .accordion-item{
  border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;
  background:#fff;box-shadow:var(--sh-1);margin-bottom:14px;
}
.faq-accordion .accordion-header{margin:0;}
.faq-accordion .accordion-button{
  background:#fff;color:var(--text);font-size:16px;font-weight:600;
  padding:17px 20px 17px 22px;box-shadow:none;border-left:3px solid var(--accent);
  border-radius:0;line-height:1.6;
}
.faq-accordion .accordion-button:not(.collapsed){background:var(--brand-soft);color:var(--brand-deep);}
.faq-accordion .accordion-button:focus{box-shadow:none;}
.faq-accordion .accordion-button::after{
  content:"";width:9px;height:9px;flex:none;margin-left:auto;
  background-image:none;border-right:2px solid var(--brand);border-bottom:2px solid var(--brand);
  transform:rotate(45deg);transition:transform .25s;position:relative;top:-3px;
}
.faq-accordion .accordion-button:not(.collapsed)::after{transform:rotate(-135deg);top:1px;}
.faq-accordion .accordion-body{padding:4px 22px 20px;font-size:15px;color:var(--muted);line-height:1.85;}
.faq-accordion .accordion-body p:last-child{margin-bottom:0;}

/* ---------- CTA 条 ---------- */
.cta-band{
  position:relative;overflow:hidden;color:#fff;border-radius:24px;
  padding:clamp(32px,5vw,54px);
  background:linear-gradient(150deg,rgba(11,61,115,.95) 0%,rgba(21,87,160,.9) 100%),
             url('/assets/images/backpic/back-3.png') center/cover no-repeat;
  box-shadow:var(--sh-2);
}
.cta-band::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(-18deg,rgba(255,255,255,.035) 0 2px,transparent 2px 15px);
}
.cta-band > *{position:relative;z-index:1;}
.cta-band h2{color:#fff;font-size:clamp(22px,2.6vw,28px);line-height:1.35;margin:0 0 12px;}
.cta-band p{color:rgba(255,255,255,.86);font-size:15px;max-width:620px;margin:0;}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:26px;}

/* ---------- 页脚 ---------- */
.site-footer{background:#0C1F38;color:#B9C7DA;padding:56px 0 24px;}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.4fr;gap:32px;}
.site-footer h4{color:#fff;font-size:15px;margin:0 0 14px;font-weight:600;}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:14px;}
.footer-brand strong{color:#fff;font-size:16px;font-weight:700;}
.site-footer p{font-size:14px;line-height:1.8;margin:0;color:#9CB0C8;}
.footer-links{list-style:none;display:grid;gap:9px;font-size:14px;}
.footer-links a{color:#B9C7DA;}
.footer-links a:hover{color:#fff;}
.footer-bottom{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;
  border-top:1px solid rgba(255,255,255,.1);margin-top:36px;padding-top:18px;
  font-size:13px;color:#8AA0BA;
}

/* ---------- 响应式 ---------- */
@media (max-width:1199.98px){
  .feature-row{gap:32px;}
  .points{gap:18px;}
}
@media (max-width:991.98px){
  .header-inner{display:flex;justify-content:space-between;min-height:60px;}
  .brand{justify-self:auto;}
  .brand-text em{display:none;}
  .brand-mark{width:30px;height:30px;border-radius:9px;}
  .brand-mark::before{left:8px;top:8px;width:14px;height:4px;}
  .brand-mark::after{left:8px;top:17px;width:9px;height:4px;}
  .feature-row{grid-template-columns:1fr;gap:22px;}
  .feature-row.reverse .feature-media{order:0;}
  .points{grid-template-columns:repeat(2,1fr);}
  .footer-grid{grid-template-columns:repeat(2,1fr);gap:28px;}
}
@media (max-width:767.98px){
  .section{padding:40px 0;}
  .cat-hero{padding:32px 0 44px;}
  .hero-actions{gap:12px;}
  .hero-actions .btn-x{width:100%;}
  .cta-actions .btn-x{width:100%;}
  .points{grid-template-columns:1fr;}
  .cta-band{border-radius:18px;}
  .footer-grid{grid-template-columns:1fr;gap:26px;}
  .footer-bottom{flex-direction:column;gap:8px;}
}
@media (max-width:520px){
  body{font-size:15px;}
  .cat-hero h1{font-size:26px;}
  .step-num{font-size:32px;}
}

/* roulang page: category2 */
:root{
  --brand:#1557A0;
  --brand-deep:#0B3D73;
  --accent:#12B39B;
  --warn:#FF6A2B;
  --bg:#F5F8FC;
  --surface:#FFFFFF;
  --line:#E3E9F2;
  --text:#16202E;
  --muted:#5A6675;
  --r-card:16px;
  --r-btn:12px;
  --r-badge:8px;
  --r-input:10px;
  --sh-1:0 1px 2px rgba(16,42,74,.06);
  --sh-2:0 12px 28px -12px rgba(16,42,74,.18);
  --bs-primary:#1557A0;
  --bs-primary-rgb:21,87,160;
  --bs-body-color:#16202E;
  --bs-body-bg:#F5F8FC;
  --bs-border-color:#E3E9F2;
  --bs-link-color:#1557A0;
  --bs-link-hover-color:#0B3D73;
  --bs-body-font-family:'PingFang SC','Microsoft YaHei','Noto Sans SC',system-ui,-apple-system,'Segoe UI',sans-serif;
}
*{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:'PingFang SC','Microsoft YaHei','Noto Sans SC',system-ui,-apple-system,'Segoe UI',sans-serif;
  font-size:16px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--brand);text-decoration:none;}
a:hover{color:var(--brand-deep);}
img{max-width:100%;height:auto;display:block;}
h1,h2,h3,h4{color:var(--text);font-weight:700;line-height:1.35;margin:0;}
h1{font-size:clamp(28px,4vw,42px);line-height:1.25;font-weight:700;}
h2{font-size:clamp(23px,2.6vw,29px);}
h3{font-size:19px;}
p{margin:0 0 14px;}
ul{margin:0;padding:0;list-style:none;}
button{font-family:inherit;}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;}
.wrap{width:100%;max-width:1200px;margin:0 auto;padding:0 20px;}

/* 顶部导航 */
.site-header{
  position:sticky;top:0;z-index:1030;
  background:#fff;
  border-bottom:1px solid var(--line);
  transition:box-shadow .25s ease;
}
.site-header.is-stuck{box-shadow:0 8px 22px -16px rgba(16,42,74,.45);}
.nav-bar{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  height:72px;
}
.nav-side{flex:1 1 0;display:flex;align-items:center;gap:24px;min-width:0;}
.nav-left{justify-content:flex-start;}
.nav-right{justify-content:flex-end;}
.nav-link{
  position:relative;
  color:var(--text);
  font-size:15px;
  font-weight:500;
  padding:6px 2px;
  white-space:nowrap;
  transition:color .2s ease;
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--brand);border-radius:2px;
  transform:scaleX(0);transform-origin:left;transition:transform .22s ease;
}
.nav-link:hover{color:var(--brand);}
.nav-link:hover::after{transform:scaleX(1);}
.nav-link.active{color:var(--brand);font-weight:600;}
.nav-link.active::after{transform:scaleX(1);}
.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto;text-decoration:none;}
.brand-mark{
  position:relative;width:36px;height:36px;border-radius:10px;flex:0 0 auto;
  background:linear-gradient(140deg,var(--brand),var(--brand-deep));
  box-shadow:var(--sh-1);
}
.brand-mark::before{
  content:"";position:absolute;left:7px;top:9px;width:22px;height:5px;
  background:rgba(255,255,255,.94);border-radius:2px;transform:skewX(-18deg);
}
.brand-mark::after{
  content:"";position:absolute;left:11px;bottom:8px;width:13px;height:5px;
  background:var(--accent);border-radius:2px;transform:skewX(-18deg);
}
.brand-text{display:flex;flex-direction:column;line-height:1.25;}
.brand-text strong{font-size:16px;font-weight:700;color:var(--text);letter-spacing:.2px;}
.brand-text small{font-size:11px;color:var(--muted);letter-spacing:.3px;}
.nav-toggle{
  width:44px;height:44px;border:1px solid var(--line);background:#fff;border-radius:var(--r-btn);
  display:inline-flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;
  cursor:pointer;flex:0 0 auto;
}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--brand);border-radius:2px;}
.mobile-menu{background:#fff;border-top:1px solid var(--line);padding:12px 0 20px;}
.mobile-menu .m-link{
  display:flex;align-items:center;min-height:48px;font-size:16px;color:var(--text);
  border-bottom:1px solid var(--line);padding:0 4px;
}
.mobile-menu .m-link.active{color:var(--brand);font-weight:600;}
.mobile-menu .btn-main{margin-top:16px;}

/* 按钮 */
.btn-main{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  background:var(--warn);color:#fff;border:1px solid var(--warn);
  border-radius:var(--r-btn);padding:12px 24px;font-size:15px;font-weight:600;
  cursor:pointer;transition:transform .2s ease,box-shadow .2s ease,background .2s ease,color .2s ease;
}
.btn-main:hover{background:#F05E1F;border-color:#F05E1F;color:#fff;transform:translateY(-2px);box-shadow:var(--sh-2);}
.btn-main:active{transform:translateY(0);box-shadow:var(--sh-1);}
.btn-main.btn-sm{padding:9px 18px;font-size:14px;}
.btn-ghost{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  background:transparent;color:var(--brand);border:1px solid rgba(21,87,160,.4);
  border-radius:var(--r-btn);padding:12px 24px;font-size:15px;font-weight:600;
  cursor:pointer;transition:transform .2s ease,box-shadow .2s ease,background .2s ease,border-color .2s ease;
}
.btn-ghost:hover{background:rgba(21,87,160,.06);border-color:var(--brand);color:var(--brand-deep);transform:translateY(-2px);}
.btn-ghost:active{transform:translateY(0);}
.btn-ghost.on-dark{color:#fff;border-color:rgba(255,255,255,.55);}
.btn-ghost.on-dark:hover{background:rgba(255,255,255,.14);color:#fff;border-color:#fff;}

/* 分栏头图 */
.page-hero{
  position:relative;overflow:hidden;
  background:var(--brand-deep);color:#fff;
  padding:clamp(44px,6.5vw,80px) 0 clamp(48px,7vw,84px);
}
.page-hero-bg{
  position:absolute;inset:0;background-size:cover;background-position:center;
  opacity:.3;filter:saturate(.9);
}
.page-hero::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(105deg,rgba(11,61,115,.95) 0%,rgba(21,87,160,.76) 58%,rgba(18,179,155,.55) 100%);
}
.page-hero::before{
  content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background-image:repeating-linear-gradient(-18deg,rgba(255,255,255,.05) 0 2px,transparent 2px 20px);
}
.page-hero-inner{position:relative;z-index:2;max-width:880px;}
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:rgba(255,255,255,.75);margin-bottom:18px;}
.crumbs a{color:rgba(255,255,255,.85);}
.crumbs a:hover{color:#fff;text-decoration:underline;text-underline-offset:3px;}
.crumbs span.sep{opacity:.5;}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  background:rgba(18,179,155,.18);border:1px solid rgba(18,179,155,.45);
  color:#EAFBF7;font-size:13px;font-weight:600;
  padding:6px 14px;border-radius:var(--r-badge);margin-bottom:18px;
}
.page-hero h1{color:#fff;margin-bottom:16px;}
.lede{font-size:clamp(16px,1.5vw,18px);color:rgba(255,255,255,.94);font-weight:600;margin-bottom:12px;}
.hero-text{color:rgba(255,255,255,.8);font-size:15.5px;max-width:700px;margin-bottom:26px;}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:22px;}
.hero-facts{display:flex;flex-wrap:wrap;gap:10px 22px;font-size:13px;color:rgba(255,255,255,.78);}
.hero-facts li{position:relative;padding-left:16px;}
.hero-facts li::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:6px;height:6px;border-radius:50%;background:var(--accent);
}

/* 通用区块 */
.section{padding:clamp(52px,7vw,88px) 0;}
.section.alt{background:#fff;}
.section-head{max-width:760px;margin-bottom:clamp(26px,3.4vw,42px);}
.section-head .kicker{
  display:inline-block;font-size:13px;font-weight:600;letter-spacing:.06em;
  color:var(--accent);text-transform:uppercase;margin-bottom:10px;
}
.section-head h2{margin-bottom:12px;}
.section-head p{color:var(--muted);margin:0;font-size:15.6px;}

/* 对比卡 */
.compare-card{
  position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--r-card);
  padding:clamp(22px,2.4vw,30px);height:100%;box-shadow:var(--sh-1);
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;overflow:hidden;
}
.compare-card:hover{transform:translateY(-3px);box-shadow:var(--sh-2);border-color:rgba(21,87,160,.24);}
.compare-card.is-star{border-color:rgba(21,87,160,.3);}
.ghost-num{
  position:absolute;right:14px;top:2px;font-size:76px;font-weight:700;
  color:rgba(21,87,160,.07);line-height:1;letter-spacing:-.04em;
  font-variant-numeric:tabular-nums;pointer-events:none;
}
.tag{
  display:inline-flex;align-items:center;gap:6px;font-size:12.5px;font-weight:600;
  padding:5px 12px;border-radius:var(--r-badge);
  background:rgba(21,87,160,.09);color:var(--brand);margin-bottom:14px;
}
.tag.tag-accent{background:rgba(18,179,155,.14);color:#0E8E7C;}
.compare-card h3{margin-bottom:10px;}
.compare-card .card-desc{color:var(--muted);font-size:15px;margin-bottom:18px;}
.spec-list{margin:0;}
.spec-row{
  display:grid;grid-template-columns:92px 1fr;gap:14px;
  padding:11px 0;border-top:1px dashed var(--line);font-size:15px;
}
.spec-row dt{color:var(--muted);font-weight:500;margin:0;}
.spec-row dd{margin:0;color:var(--text);}
.compare-note{
  margin-top:26px;background:#fff;border:1px dashed var(--line);border-radius:var(--r-card);
  padding:18px 22px;font-size:14.5px;color:var(--muted);
}
.compare-note strong{color:var(--text);}

/* 时间轴 */
.timeline{position:relative;padding:6px 0 0;}
.timeline::before{
  content:"";position:absolute;left:23px;top:10px;bottom:30px;width:2px;
  background:linear-gradient(180deg,var(--brand),rgba(18,179,155,.45));
  border-radius:2px;
}
.tl-item{position:relative;padding:0 0 26px 70px;}
.tl-item:last-child{padding-bottom:0;}
.tl-num{
  position:absolute;left:0;top:0;width:48px;height:48px;border-radius:14px;
  background:#fff;border:1px solid rgba(21,87,160,.22);color:var(--brand);
  display:flex;align-items:center;justify-content:center;
  font-weight:700;font-size:16px;font-variant-numeric:tabular-nums;
  box-shadow:var(--sh-1);
}
.tl-item h3{font-size:18px;margin-bottom:6px;}
.tl-item p{color:var(--muted);font-size:15px;margin:0;}

/* 图文场景 */
.scene-figure{
  border-radius:var(--r-card);overflow:hidden;box-shadow:var(--sh-2);border:1px solid var(--line);
  background:#fff;
}
.scene-figure img{width:100%;height:100%;object-fit:cover;aspect-ratio:4/3;}
.scene-item{display:flex;gap:14px;padding:16px 0;border-top:1px solid var(--line);}
.scene-item:first-of-type{border-top:none;padding-top:0;}
.scene-dot{
  flex:0 0 auto;width:34px;height:34px;border-radius:10px;
  background:rgba(18,179,155,.13);color:#0E8E7C;
  display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;
  font-variant-numeric:tabular-nums;
}
.scene-item h3{font-size:16.5px;margin-bottom:4px;}
.scene-item p{margin:0;color:var(--muted);font-size:14.6px;}

/* 数据卡与清单 */
.stat-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-card);
  padding:22px;height:100%;box-shadow:var(--sh-1);
  transition:transform .22s ease,box-shadow .22s ease,border-color .22s ease;
}
.stat-card:hover{transform:translateY(-3px);box-shadow:var(--sh-2);border-color:rgba(21,87,160,.22);}
.stat-num{
  font-size:32px;font-weight:700;color:var(--brand);line-height:1.1;
  font-variant-numeric:tabular-nums;margin-bottom:8px;
}
.stat-num em{font-style:normal;font-size:15px;font-weight:600;color:var(--muted);margin-left:4px;}
.stat-card h3{font-size:16px;margin-bottom:6px;}
.stat-card p{margin:0;color:var(--muted);font-size:14.4px;}
.check-list{background:#fff;border:1px solid var(--line);border-radius:var(--r-card);padding:clamp(22px,2.4vw,30px);box-shadow:var(--sh-1);}
.check-list h3{margin-bottom:14px;}
.check-list li{
  position:relative;padding:11px 0 11px 30px;border-top:1px solid var(--line);
  font-size:15.4px;color:var(--text);
}
.check-list li:first-child{border-top:none;}
.check-list li::before{
  content:"";position:absolute;left:4px;top:20px;width:11px;height:6px;
  border-left:2px solid var(--accent);border-bottom:2px solid var(--accent);
  transform:rotate(-45deg);
}

/* FAQ */
.faq-item{
  background:#fff;border:1px solid var(--line);border-radius:14px;
  margin-bottom:12px;overflow:hidden;transition:border-color .2s ease,box-shadow .2s ease;
}
.faq-item:hover{border-color:rgba(21,87,160,.24);}
.faq-item[open]{box-shadow:var(--sh-1);border-color:rgba(21,87,160,.24);}
.faq-item summary{
  list-style:none;cursor:pointer;position:relative;
  padding:18px 56px 18px 22px;font-size:16px;font-weight:600;color:var(--text);
  transition:background .2s ease;
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::before{
  content:"";position:absolute;left:0;top:14px;bottom:14px;width:3px;
  background:var(--accent);border-radius:0 3px 3px 0;opacity:0;transition:opacity .2s ease;
}
.faq-item[open] summary::before{opacity:1;}
.faq-item[open] summary{background:#EEF4FC;color:var(--brand-deep);}
.faq-item summary::after{
  content:"";position:absolute;right:24px;top:50%;width:9px;height:9px;
  border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);
  transform:translateY(-70%) rotate(45deg);transition:transform .25s ease,border-color .25s ease;
}
.faq-item[open] summary::after{
  transform:translateY(-30%) rotate(-135deg);border-color:var(--brand);
}
.faq-body{padding:0 22px 20px;color:var(--muted);font-size:15px;}

/* CTA 条 */
.cta-band{
  position:relative;overflow:hidden;border-radius:20px;color:#fff;
  background:linear-gradient(120deg,var(--brand-deep) 0%,var(--brand) 62%,#1B7FB0 100%);
  padding:clamp(30px,4.4vw,48px);
  box-shadow:var(--sh-2);
}
.cta-band::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:repeating-linear-gradient(-18deg,rgba(255,255,255,.05) 0 2px,transparent 2px 20px);
}
.cta-inner{position:relative;z-index:2;display:flex;flex-wrap:wrap;gap:26px;align-items:center;justify-content:space-between;}
.cta-copy{max-width:640px;}
.cta-copy h2{color:#fff;margin-bottom:10px;}
.cta-copy p{color:rgba(255,255,255,.85);margin:0;font-size:15.4px;}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px;}

/* 页脚 */
.site-footer{background:#0C1F38;color:#B9C7DA;padding:clamp(44px,5vw,60px) 0 24px;margin-top:0;}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.3fr;gap:34px;}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:14px;}
.footer-brand .brand-mark{width:32px;height:32px;border-radius:9px;}
.footer-brand strong{color:#fff;font-size:16px;}
.site-footer p{font-size:14px;color:#B9C7DA;line-height:1.8;margin:0;}
.site-footer h4{color:#fff;font-size:15px;margin-bottom:14px;font-weight:600;}
.footer-links li{margin-bottom:10px;}
.footer-links a{color:#B9C7DA;font-size:14px;transition:color .2s ease;}
.footer-links a:hover{color:#fff;text-decoration:none;}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;align-items:center;
  border-top:1px solid rgba(255,255,255,.12);margin-top:34px;padding-top:18px;
  font-size:13px;color:#8FA2BC;
}

/* 响应式 */
@media (max-width:1199.98px){
  .nav-side{gap:18px;}
  .brand-text strong{font-size:15px;}
  .footer-grid{gap:26px;}
}
@media (max-width:991.98px){
  .nav-bar{height:64px;}
  .section{padding:52px 0;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px;}
  .spec-row{grid-template-columns:86px 1fr;}
}
@media (max-width:767.98px){
  body{font-size:15.5px;}
  .nav-bar{height:60px;}
  .brand-text small{display:none;}
  .brand-mark{width:32px;height:32px;}
  .page-hero{padding:34px 0 44px;}
  .section{padding:40px 0;}
  .hero-actions .btn-main,.hero-actions .btn-ghost{width:100%;}
  .cta-actions{width:100%;}
  .cta-actions .btn-main,.cta-actions .btn-ghost{width:100%;}
  .timeline::before{left:19px;}
  .tl-item{padding-left:58px;}
  .tl-num{width:40px;height:40px;border-radius:12px;font-size:15px;}
  .footer-grid{grid-template-columns:1fr;gap:26px;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
  .spec-row{grid-template-columns:1fr;gap:2px;}
  .spec-row dt{font-size:13px;color:var(--muted);}
}
@media (max-width:519.98px){
  .wrap{padding:0 16px;}
  .ghost-num{font-size:58px;}
  .stat-num{font-size:27px;}
}