/* roulang page: index */
:root{
  --brand-50:#EFF7FD;
  --brand-100:#DCEEFB;
  --brand-500:#1C86D1;
  --brand-600:#0F6FB8;
  --brand-700:#0B5490;
  --brand-900:#072E4F;
  --accent:#FF7A3D;
  --accent-hover:#EA6428;
  --mint:#12B5A6;
  --mint-soft:#E4F7F5;
  --text:#0B1F33;
  --text-2:#4A6076;
  --text-3:#8A9BAE;
  --border:#E3EBF3;
  --page:#F5F9FD;
  --card:#FFFFFF;
  --radius-card:16px;
  --radius-btn:12px;
  --radius-img:12px;
  --shadow-card:0 1px 2px rgba(7,46,79,.06),0 12px 32px -12px rgba(7,46,79,.16);
  --shadow-hover:0 2px 4px rgba(7,46,79,.08),0 22px 44px -18px rgba(7,46,79,.26);
  --header-h:88px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--page);color:var(--text-2);font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;font-size:16px;line-height:1.75;font-variant-numeric:tabular-nums;-webkit-font-smoothing:antialiased}
body.no-scroll{overflow:hidden}
img{display:block;max-width:100%;height:auto}
a{color:var(--brand-600);text-decoration:none;transition:color .18s ease}
a:hover{color:var(--brand-700)}
h1,h2,h3,h4{margin:0;color:var(--text);font-weight:600;line-height:1.3}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
input{font:inherit}
a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:2px solid var(--brand-500);outline-offset:2px;border-radius:8px}
.icon{width:22px;height:22px;stroke:currentColor;fill:none;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round;flex:none}
.icon--fill{fill:currentColor;stroke:none}
.container-x{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}
.section{padding:96px 0}
.section--white{background:#fff}
.section--soft{background:var(--brand-50)}
.section-line{height:1px;background:linear-gradient(90deg,transparent,rgba(227,235,243,.95),transparent)}
.section-head{max-width:760px;margin-bottom:44px}
.section-head h2{font-size:clamp(24px,3vw,32px);margin-bottom:12px}
.section-head p{font-size:16px;color:var(--text-2)}
.section-head--row{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;max-width:none}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;letter-spacing:.04em;color:var(--brand-600);margin-bottom:14px}
.eyebrow::before{content:"";width:4px;height:14px;border-radius:2px;background:var(--accent)}

/* ============ 按钮 ============ */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 26px;border-radius:var(--radius-btn);font-size:16px;font-weight:600;border:1px solid transparent;transition:transform .18s ease,box-shadow .18s ease,background-color .18s ease,color .18s ease,border-color .18s ease}
.btn--primary{background:var(--accent);color:#fff;box-shadow:0 12px 26px -14px rgba(255,122,61,.95)}
.btn--primary:hover{background:var(--accent-hover);color:#fff;transform:translateY(-2px);box-shadow:0 16px 30px -14px rgba(255,122,61,1)}
.btn--primary:active{transform:translateY(0)}
.btn--ghost{background:#fff;border-color:var(--border);color:var(--brand-700)}
.btn--ghost:hover{background:var(--brand-50);border-color:var(--brand-100);color:var(--brand-700);transform:translateY(-2px)}
.btn--ghost:active{transform:translateY(0)}
.btn--pill{border-radius:999px}
.btn--sm{padding:11px 20px;font-size:15px}
.btn-text{display:inline-flex;align-items:center;gap:6px;font-size:15px;font-weight:600;color:var(--brand-600)}
.btn-text span{transition:transform .18s ease}
.btn-text:hover span{transform:translateX(3px)}

/* ============ 徽章 ============ */
.badge{display:inline-flex;align-items:center;gap:6px;padding:5px 11px;border-radius:8px;font-size:13px;font-weight:600;line-height:1.5}
.badge--brand{background:var(--brand-50);color:var(--brand-700)}
.badge--mint{background:var(--mint-soft);color:#0A7C71}
.badge--info{background:#F5F9FD;color:var(--text-2);border:1px solid var(--border)}
.dot-live{width:7px;height:7px;border-radius:50%;background:var(--mint);box-shadow:0 0 0 3px rgba(18,181,166,.18)}

/* ============ 导航 ============ */
.site-header{position:fixed;top:0;left:0;right:0;z-index:80;height:var(--header-h);background:rgba(255,255,255,.62);backdrop-filter:blur(14px) saturate(140%);-webkit-backdrop-filter:blur(14px) saturate(140%);border-bottom:1px solid rgba(255,255,255,.6);box-shadow:0 8px 24px -20px rgba(7,46,79,.5);transition:height .2s ease,background-color .2s ease,box-shadow .2s ease,border-color .2s ease}
.site-header.is-scrolled{height:72px;background:rgba(255,255,255,.96);border-bottom-color:var(--border);box-shadow:0 6px 26px -16px rgba(7,46,79,.35)}
.nav-inner{height:100%;display:flex;align-items:center;justify-content:space-between;gap:24px}
.logo{display:inline-flex;align-items:center;gap:10px;color:var(--text)}
.logo-mark{width:36px;height:36px;border-radius:10px;background:var(--brand-600);color:#fff;display:grid;place-items:center;font-size:17px;font-weight:700;letter-spacing:-.5px}
.logo-text{font-size:17px;font-weight:700;color:var(--text);white-space:nowrap}
.logo-sub{display:block;font-size:11px;font-weight:500;color:var(--text-3);letter-spacing:.16em}
.nav-links{display:flex;align-items:center;gap:6px}
.nav-links a{padding:9px 13px;border-radius:10px;font-size:15px;font-weight:500;color:var(--text-2);transition:background-color .18s ease,color .18s ease}
.nav-links a:hover{background:rgba(28,134,209,.1);color:var(--brand-700)}
.nav-links a.active{color:var(--brand-700);font-weight:600;background:rgba(28,134,209,.12)}
.nav-right{display:flex;align-items:center;gap:12px}
.nav-search{display:flex;align-items:center;gap:8px;height:42px;padding:0 14px;border-radius:999px;border:1px solid var(--border);background:rgba(255,255,255,.8);color:var(--text-3);font-size:14px;transition:border-color .18s ease,box-shadow .18s ease}
.nav-search:hover{border-color:var(--brand-100);color:var(--brand-600)}
.nav-toggle{display:none;width:42px;height:42px;border-radius:12px;border:1px solid var(--border);background:#fff;align-items:center;justify-content:center}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--text);border-radius:2px;position:relative}
.nav-toggle span::before,.nav-toggle span::after{content:"";position:absolute;left:0;width:18px;height:2px;background:var(--text);border-radius:2px}
.nav-toggle span::before{top:-6px}
.nav-toggle span::after{top:6px}
.nav-scrim{position:fixed;inset:0;background:rgba(7,46,79,.45);opacity:0;visibility:hidden;transition:opacity .2s ease;z-index:90}
.nav-scrim.is-open{opacity:1;visibility:visible}
.nav-drawer{position:fixed;top:0;right:0;bottom:0;width:min(84vw,340px);background:#fff;z-index:95;transform:translateX(102%);transition:transform .24s ease;padding:24px;display:flex;flex-direction:column;gap:6px;border-radius:16px 0 0 16px;box-shadow:-20px 0 40px -24px rgba(7,46,79,.4)}
.nav-drawer.is-open{transform:translateX(0)}
.nav-drawer a.drawer-link{font-size:17px;font-weight:500;color:var(--text);padding:13px 12px;border-radius:12px}
.nav-drawer a.drawer-link:hover{background:var(--brand-50);color:var(--brand-700)}
.nav-drawer a.drawer-link.active{background:var(--brand-50);color:var(--brand-700);font-weight:600}
.drawer-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}
.drawer-close{width:38px;height:38px;border-radius:10px;border:1px solid var(--border);display:grid;place-items:center;font-size:18px;color:var(--text-2)}
.drawer-foot{margin-top:auto;padding-top:18px;border-top:1px solid var(--border)}

/* ============ Hero ============ */
.hero{position:relative;overflow:hidden;background:#E9F3FC;padding:calc(var(--header-h) + 76px) 0 100px}
.hero-bg{position:absolute;inset:0;background-image:url('/assets/images/backpic/back-1.webp');background-size:cover;background-position:center right;opacity:.6}
.hero-veil{position:absolute;inset:0;background:linear-gradient(102deg,rgba(239,247,253,.97) 0%,rgba(239,247,253,.9) 42%,rgba(239,247,253,.4) 100%)}
.hero-inner{position:relative;display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero-title{font-size:clamp(29px,4vw,48px);font-weight:700;line-height:1.22;letter-spacing:-.01em;margin:16px 0 18px}
.hero-sub{font-size:17px;line-height:1.8;color:var(--text-2);max-width:560px}
.hero-actions{display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin:30px 0 20px}
.hero-note{font-size:13px;color:var(--text-3)}
.hero-visual{position:relative;justify-self:center;width:100%;max-width:460px}
.hero-visual img{width:100%;border-radius:20px;box-shadow:var(--shadow-hover);background:#fff}
.hero-float{position:absolute;left:-16px;bottom:26px;background:#fff;border-radius:14px;padding:14px 18px;display:flex;align-items:center;gap:14px;box-shadow:var(--shadow-card);border:1px solid var(--border)}
.hero-float-num{font-size:32px;font-weight:600;color:var(--brand-700);line-height:1}
.hero-float-text{font-size:12.5px;line-height:1.55;color:var(--text-3)}

/* ============ 信任条 ============ */
.trust-bar{background:#fff;border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.trust-grid{display:grid;grid-template-columns:repeat(4,1fr);padding:30px 0}
.trust-item{padding:0 8px;text-align:center;border-left:1px solid var(--border)}
.trust-item:first-child{border-left:0}
.trust-num{font-size:30px;font-weight:600;color:var(--brand-700);line-height:1.15}
.trust-num small{font-size:16px;font-weight:600;margin-left:2px}
.trust-label{font-size:13.5px;color:var(--text-3);margin-top:4px}

/* ============ 价值区 ============ */
.value-layout{display:grid;grid-template-columns:.9fr 1.1fr;gap:56px;align-items:center}
.value-media{border-radius:var(--radius-card);overflow:hidden;border:1px solid var(--border);background:#fff;box-shadow:var(--shadow-card)}
.value-media img{width:100%;aspect-ratio:4/5;object-fit:cover}
.value-list li{display:flex;gap:18px;padding:24px 0;border-bottom:1px solid var(--border)}
.value-list li:first-child{padding-top:0}
.value-list li:last-child{border-bottom:0}
.value-idx{font-size:14px;font-weight:700;color:var(--brand-500);width:30px;flex:none;padding-top:3px}
.value-body h3{font-size:19px;margin-bottom:6px;display:flex;align-items:center;gap:10px}
.value-body p{font-size:15px;line-height:1.8;color:var(--text-2)}
.value-icon{width:34px;height:34px;border-radius:10px;border:1px solid var(--brand-100);background:var(--brand-50);color:var(--brand-600);display:grid;place-items:center;flex:none}
.value-cta{margin-top:22px}

/* ============ 轮播 ============ */
.carousel-nav{display:flex;gap:10px;flex:none}
.circle-btn{width:42px;height:42px;border-radius:50%;background:rgba(255,255,255,.9);border:1px solid var(--border);color:var(--brand-700);display:grid;place-items:center;transition:background-color .18s ease,transform .18s ease,box-shadow .18s ease}
.circle-btn:hover{background:#fff;transform:translateY(-2px);box-shadow:var(--shadow-card)}
.shot-track{display:flex;gap:24px;overflow-x:auto;scroll-snap-type:x mandatory;padding:6px 4px 20px;scrollbar-width:none;-ms-overflow-style:none}
.shot-track::-webkit-scrollbar{display:none}
.shot-card{flex:0 0 calc((100% - 48px)/3);scroll-snap-align:start;background:#fff;border:1px solid var(--border);border-radius:var(--radius-card);overflow:hidden;box-shadow:var(--shadow-card);transition:transform .2s ease,box-shadow .2s ease}
.shot-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.shot-frame{padding:16px 16px 0}
.shot-frame img{width:100%;aspect-ratio:9/16;object-fit:cover;border-radius:12px;border:1px solid var(--border)}
.shot-cap{padding:16px 20px 20px;font-size:14.5px;color:var(--text-2)}
.shot-dots{display:flex;gap:8px;margin-top:4px}
.shot-dots span{width:26px;height:4px;border-radius:2px;background:var(--border);transition:background-color .2s ease,width .2s ease}
.shot-dots span.on{background:var(--brand-500);width:38px}

/* ============ 系统要求 ============ */
.req-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.req-card{display:flex;align-items:flex-start;gap:16px;background:#fff;border:1px solid var(--border);border-radius:var(--radius-card);padding:20px 22px;transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease}
.req-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-card);border-color:var(--brand-100)}
.req-icon{width:40px;height:40px;border-radius:12px;background:var(--brand-50);color:var(--brand-600);display:grid;place-items:center;flex:none}
.req-name{font-size:14px;color:var(--text-3);margin-bottom:2px}
.req-val{font-size:17px;font-weight:600;color:var(--text)}
.req-foot{margin-top:22px;display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.req-foot p{font-size:13.5px;color:var(--text-3);max-width:720px}

/* ============ 评价墙 ============ */
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;align-items:start}
.review-card{position:relative;background:#fff;border:1px solid var(--border);border-radius:var(--radius-card);padding:24px;box-shadow:var(--shadow-card);transition:transform .2s ease,box-shadow .2s ease}
.review-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.review-card:nth-child(3n+2){margin-top:24px}
.review-quote{position:absolute;top:14px;right:20px;font-size:52px;line-height:1;color:rgba(28,134,209,.1);font-family:Georgia,serif}
.review-stars{display:flex;gap:3px;color:var(--accent);margin-bottom:12px}
.review-stars .icon{width:16px;height:16px}
.review-text{font-size:15px;line-height:1.8;color:var(--text-2);display:-webkit-box;-webkit-line-clamp:4;-webkit-box-orient:vertical;overflow:hidden}
.review-card.is-open .review-text{-webkit-line-clamp:unset;display:block}
.review-toggle{margin-top:10px;font-size:13.5px;font-weight:600;color:var(--brand-600)}
.review-user{display:flex;align-items:center;gap:12px;margin-top:18px;padding-top:16px;border-top:1px solid var(--border)}
.review-avatar{width:38px;height:38px;border-radius:50%;background:var(--brand-100);color:var(--brand-700);display:grid;place-items:center;font-size:14px;font-weight:600;flex:none}
.review-name{font-size:14.5px;font-weight:600;color:var(--text)}
.review-meta{font-size:12.5px;color:var(--text-3)}

/* ============ 下载带 ============ */
.download-band{background:var(--brand-50);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.download-inner{display:grid;grid-template-columns:1.25fr .75fr;gap:44px;align-items:center}
.download-inner h2{font-size:clamp(23px,2.8vw,30px);margin-bottom:12px}
.download-inner p.lead{font-size:15.5px;color:var(--text-2);max-width:560px}
.dl-buttons{display:flex;gap:12px;flex-wrap:wrap;margin:24px 0 14px}
.dl-note{font-size:13px;color:var(--text-3)}
.qr-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius-card);padding:22px;text-align:center;box-shadow:var(--shadow-card)}
.qr-card img{width:150px;height:150px;object-fit:cover;border-radius:12px;margin:0 auto 12px;border:1px solid var(--border)}
.qr-card p{font-size:13.5px;color:var(--text-2)}
.qr-check{display:inline-flex;align-items:center;gap:6px;margin-top:10px;font-size:12.5px;color:#0A7C71;background:var(--mint-soft);padding:5px 10px;border-radius:8px}

/* ============ 资讯列表 ============ */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.news-card{display:flex;flex-direction:column;background:#fff;border:1px solid var(--border);border-radius:var(--radius-card);overflow:hidden;box-shadow:var(--shadow-card);transition:transform .2s ease,box-shadow .2s ease}
.news-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.news-card:hover .news-title{color:var(--brand-600)}
.news-thumb{aspect-ratio:16/10;overflow:hidden;background:var(--brand-50)}
.news-thumb img{width:100%;height:100%;object-fit:cover}
.news-body{padding:20px 22px 22px;display:flex;flex-direction:column;gap:10px;flex:1}
.news-title{font-size:17.5px;font-weight:600;color:var(--text);line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;transition:color .18s ease}
.news-excerpt{font-size:14.5px;line-height:1.75;color:var(--text-2);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.news-foot{margin-top:auto;padding-top:12px;border-top:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;font-size:13px;color:var(--text-3)}
.news-card--feature{grid-column:1 / -1;flex-direction:row;align-items:stretch}
.news-card--feature .news-thumb{width:46%;aspect-ratio:auto;flex:none}
.news-card--feature .news-body{padding:30px 32px;justify-content:center}
.news-card--feature .news-title{font-size:23px;-webkit-line-clamp:2}
.news-card--feature .news-excerpt{-webkit-line-clamp:3}
.empty-state{border:1px dashed var(--border);border-radius:var(--radius-card);padding:52px 24px;text-align:center;background:#fff;display:flex;flex-direction:column;align-items:center;gap:12px}
.empty-state .icon{width:34px;height:34px;color:var(--text-3)}
.empty-state p{font-size:15px;color:var(--text-3)}

/* ============ FAQ ============ */
.faq-wrap{max-width:880px;margin:0 auto}
.faq-item{background:#fff;border:1px solid var(--border);border-radius:var(--radius-card);margin-bottom:14px;overflow:hidden;transition:border-color .2s ease,box-shadow .2s ease}
.faq-item:hover{border-color:var(--brand-100)}
.faq-item[open]{border-color:var(--brand-100);box-shadow:var(--shadow-card)}
.faq-q{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px 24px;font-size:17px;font-weight:600;color:var(--text);cursor:pointer;list-style:none}
.faq-q::-webkit-details-marker{display:none}
.faq-chev{flex:none;color:var(--brand-500);transition:transform .22s ease}
.faq-item[open] .faq-chev{transform:rotate(180deg)}
.faq-a{position:relative;padding:0 24px 22px 24px;font-size:15px;line-height:1.8;color:var(--text-2)}
.faq-item[open] .faq-a{padding-left:34px}
.faq-item[open] .faq-a::before{content:"";position:absolute;left:22px;top:4px;bottom:26px;width:3px;border-radius:2px;background:var(--brand-500)}

/* ============ 收尾 CTA ============ */
.final-cta{padding:88px 0;text-align:center}
.final-cta h2{font-size:clamp(23px,2.8vw,30px);margin-bottom:22px}

/* ============ 页脚 ============ */
.site-footer{background:var(--brand-900);color:#B9D2E6;padding:64px 0 0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px;padding-bottom:44px}
.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-size:17px;font-weight:700;margin-bottom:14px}
.footer-brand .logo-mark{background:rgba(255,255,255,.14)}
.footer-desc{font-size:14px;line-height:1.8;color:#9FBBD3;max-width:320px}
.footer-col h3{font-size:15px;font-weight:600;color:#fff;margin-bottom:16px}
.footer-col li{margin-bottom:10px}
.footer-col a{font-size:14px;color:#9FBBD3}
.footer-col a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding:20px 0;display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;font-size:13px;color:#8AA8C2}
.footer-bottom a{color:#8AA8C2}
.footer-bottom a:hover{color:#fff}

/* ============ 响应式 ============ */
@media (max-width:1024px){
  .section{padding:72px 0}
  .hero{padding:calc(var(--header-h) + 56px) 0 76px}
  .hero-inner{grid-template-columns:1fr;gap:40px}
  .hero-visual{max-width:420px;justify-self:start}
  .value-layout{grid-template-columns:1fr;gap:36px}
  .value-media img{aspect-ratio:16/10}
  .shot-card{flex:0 0 calc((100% - 24px)/2)}
  .review-grid{grid-template-columns:repeat(2,1fr)}
  .review-card:nth-child(3n+2){margin-top:0}
  .review-card:nth-child(2n){margin-top:24px}
  .news-grid{grid-template-columns:repeat(2,1fr)}
  .news-card--feature{flex-direction:column}
  .news-card--feature .news-thumb{width:100%;aspect-ratio:16/9}
  .download-inner{grid-template-columns:1fr;gap:32px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .nav-links{display:none}
  .nav-toggle{display:flex}
  .nav-search{display:none}
}
@media (max-width:768px){
  .container-x{padding:0 18px}
  .section{padding:56px 0}
  .trust-grid{grid-template-columns:repeat(2,1fr);gap:18px 0;padding:24px 0}
  .trust-item:nth-child(3){border-left:0}
  .trust-item{padding:6px 4px}
  .req-grid{grid-template-columns:1fr}
  .news-grid{grid-template-columns:1fr}
  .section-head--row{flex-direction:column;align-items:flex-start}
  .hero-float{left:0;padding:12px 14px}
  .hero-float-num{font-size:26px}
}
@media (max-width:520px){
  body{font-size:15.5px}
  .hero-actions{gap:12px}
  .hero-actions .btn{width:100%}
  .hero-actions .btn-text{width:100%;justify-content:center}
  .dl-buttons .btn{width:100%}
  .review-grid{grid-template-columns:1fr}
  .review-card:nth-child(2n){margin-top:0}
  .shot-card{flex:0 0 85%}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}

/* roulang page: article */
:root{
  --brand-50:#EFF7FD; --brand-100:#DCEEFB; --brand-500:#1C86D1; --brand-600:#0F6FB8; --brand-700:#0B5490; --brand-900:#072E4F;
  --accent:#FF7A3D; --accent-hover:#EA6428; --mint:#12B5A6; --mint-700:#0A7D73;
  --ink:#0B1F33; --ink-soft:#4A6076; --ink-mute:#8A9BAE; --line:#E3EBF3; --page:#F5F9FD; --card:#FFFFFF;
  --r-card:16px; --r-btn:12px; --r-img:12px;
  --shadow-card:0 1px 2px rgba(7,46,79,.06), 0 12px 32px -12px rgba(7,46,79,.16);
  --shadow-hover:0 2px 6px rgba(7,46,79,.08), 0 20px 42px -16px rgba(7,46,79,.24);
  --nav-h:88px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--page);color:var(--ink);
  font-family:'PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,'Segoe UI',sans-serif;
  font-size:16px;line-height:1.75;font-variant-numeric:tabular-nums;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto}
a{color:var(--brand-600);text-decoration:none}
a:hover{color:var(--brand-700)}
button{font:inherit;cursor:pointer}
input,button,textarea{font-family:inherit}
h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0}
ul,ol{padding:0}
.container-x{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
.icon{width:20px;height:20px;stroke:currentColor;fill:none;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* ============ 导航 ============ */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:70;
  background:rgba(255,255,255,.62);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid rgba(255,255,255,.65);
  box-shadow:0 8px 26px -22px rgba(7,46,79,.4);
  transition:background .2s ease,box-shadow .2s ease;
}
.site-header.is-scrolled{background:rgba(255,255,255,.96);box-shadow:0 10px 28px -20px rgba(7,46,79,.42)}
.nav-inner{display:flex;align-items:center;gap:22px;height:var(--nav-h);transition:height .2s ease}
.site-header.is-scrolled .nav-inner{height:72px}
.logo{display:flex;align-items:center;gap:12px;color:inherit}
.logo-mark{
  width:40px;height:40px;border-radius:12px;flex:0 0 40px;display:grid;place-items:center;
  background:linear-gradient(140deg,var(--brand-500),var(--brand-700));color:#fff;font-weight:700;font-size:19px;
  box-shadow:0 8px 18px -10px rgba(11,84,144,.7);
}
.logo-text{display:block;font-size:17px;font-weight:700;line-height:1.25;color:var(--ink)}
.logo-sub{display:block;font-size:10.5px;letter-spacing:.2em;color:var(--ink-mute);text-transform:uppercase}
.nav-links{display:flex;align-items:center;gap:4px;margin-left:auto}
.nav-links a{
  padding:9px 13px;border-radius:10px;font-size:15px;color:var(--ink-soft);white-space:nowrap;
  transition:background .18s ease,color .18s ease;
}
.nav-links a:hover{background:var(--brand-50);color:var(--brand-700)}
.nav-links a.active{background:var(--brand-50);color:var(--brand-700);font-weight:600}
.nav-links a:focus-visible,.nav-search:focus-visible,.btn:focus-visible,.nav-toggle:focus-visible,a:focus-visible{
  outline:2px solid var(--brand-500);outline-offset:2px;border-radius:10px;
}
.nav-right{display:flex;align-items:center;gap:12px}
.nav-search{
  display:inline-flex;align-items:center;gap:7px;padding:9px 14px;border-radius:999px;
  border:1px solid var(--line);background:rgba(255,255,255,.85);color:var(--ink-soft);font-size:14px;
  transition:background .18s ease,border-color .18s ease,color .18s ease;
}
.nav-search:hover{background:var(--brand-50);border-color:var(--brand-100);color:var(--brand-700)}
.nav-toggle{display:none;width:44px;height:44px;border-radius:12px;border:1px solid var(--line);background:#fff;position:relative}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{
  content:"";position:absolute;left:50%;width:18px;height:1.6px;background:var(--ink);transform:translateX(-50%);border-radius:2px;transition:.2s;
}
.nav-toggle span{top:21px}
.nav-toggle span::before{top:-6px}
.nav-toggle span::after{top:6px}
.nav-toggle[aria-expanded="true"] span{background:transparent}
.nav-toggle[aria-expanded="true"] span::before{top:0;transform:translateX(-50%) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span::after{top:0;transform:translateX(-50%) rotate(-45deg)}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  border:1px solid transparent;border-radius:var(--r-btn);
  padding:13px 24px;font-size:15px;font-weight:600;line-height:1;
  transition:transform .18s ease,box-shadow .18s ease,background .18s ease,color .18s ease,border-color .18s ease;
}
.btn--primary{background:var(--accent);color:#fff;box-shadow:0 10px 22px -12px rgba(255,122,61,.85)}
.btn--primary:hover{background:var(--accent-hover);color:#fff;transform:translateY(-2px);box-shadow:0 16px 30px -14px rgba(234,100,40,.9)}
.btn--primary:active{transform:translateY(0)}
.btn--ghost{background:#fff;border-color:var(--line);color:var(--brand-700)}
.btn--ghost:hover{background:var(--brand-50);border-color:var(--brand-100);transform:translateY(-2px)}
.btn--sm{padding:10px 18px;font-size:14px}
.btn--pill{border-radius:999px}
.btn--block{width:100%}
.link-arrow{display:inline-flex;align-items:center;gap:6px;font-weight:600;color:var(--brand-600)}
.link-arrow .icon{width:16px;height:16px;transition:transform .18s ease}
.link-arrow:hover .icon{transform:translateX(3px)}

/* ============ 徽章 ============ */
.badge{display:inline-flex;align-items:center;gap:6px;font-size:13px;line-height:1;padding:7px 11px;border-radius:8px;font-weight:600}
.badge--brand{background:var(--brand-50);color:var(--brand-700)}
.badge--mint{background:#E7F8F6;color:var(--mint-700)}
.badge--info{background:var(--page);color:var(--ink-soft);font-weight:500}

/* ============ 文章头部 ============ */
.article-hero{position:relative;overflow:hidden;background:linear-gradient(180deg,var(--brand-50) 0%,var(--page) 78%);padding:calc(var(--nav-h) + 46px) 0 40px}
.article-hero .hero-bg{position:absolute;right:-60px;top:-40px;width:640px;max-width:70%;opacity:.16;pointer-events:none;border-radius:24px}
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:14px;color:var(--ink-mute);position:relative;z-index:1}
.breadcrumb a{color:var(--brand-600)}
.breadcrumb a:hover{text-decoration:underline;text-underline-offset:4px}
.breadcrumb .sep{color:var(--ink-mute)}
.breadcrumb .current{color:var(--ink-mute);max-width:520px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.article-head{margin-top:22px;position:relative;z-index:1;max-width:830px}
.article-head h1{font-size:clamp(26px,4vw,40px);line-height:1.28;font-weight:700;letter-spacing:-.4px;margin:16px 0 0}
.title-rule{width:48px;height:3px;border-radius:3px;background:var(--brand-500);margin:22px 0 0}
.meta-row{display:flex;flex-wrap:wrap;align-items:center;gap:10px 18px;margin-top:20px;font-size:13.5px;color:var(--ink-mute)}
.meta-row .meta-item{display:inline-flex;align-items:center;gap:6px}
.meta-row .icon{width:15px;height:15px}
.cover-wrap{margin:34px auto 0;max-width:1060px;border-radius:var(--r-card);overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow-card);background:#fff;position:relative;z-index:1}
.cover-wrap img{width:100%;aspect-ratio:16/9;object-fit:cover}

/* ============ 正文布局 ============ */
.article-main{padding:56px 0 72px}
.article-grid{display:grid;grid-template-columns:minmax(0,1fr) 220px;gap:56px;align-items:start}
.article-body{max-width:760px}
.prose-article{font-size:16px;line-height:1.9;color:var(--ink)}
.prose-article > * + *{margin-top:18px}
.prose-article h2{font-size:27px;line-height:1.4;font-weight:600;margin-top:40px;margin-bottom:16px;letter-spacing:-.2px}
.prose-article h3{font-size:20px;line-height:1.5;font-weight:600;margin-top:28px;margin-bottom:12px}
.prose-article h2:first-child,.prose-article h3:first-child{margin-top:0}
.prose-article p{color:var(--ink)}
.prose-article strong{color:var(--brand-900)}
.prose-article a{color:var(--brand-600);text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:1px}
.prose-article ul,.prose-article ol{padding-left:22px;line-height:1.8}
.prose-article li{margin:8px 0}
.prose-article ul li::marker{color:var(--brand-500)}
.prose-article ol li::marker{color:var(--brand-500);font-weight:600}
.prose-article blockquote{
  border-left:3px solid var(--brand-500);background:var(--brand-50);
  padding:16px 20px;border-radius:0 12px 12px 0;color:var(--ink-soft);
}
.prose-article blockquote > * + *{margin-top:10px}
.prose-article img{border-radius:var(--r-img);border:1px solid var(--line)}
.prose-article figure figcaption{font-size:13px;color:var(--ink-mute);margin-top:8px}
.prose-article hr{border:0;border-top:1px solid var(--line);margin:32px 0}
.prose-article table{width:100%;border-collapse:collapse;font-size:15px}
.prose-article th,.prose-article td{border:1px solid var(--line);padding:11px 14px;text-align:left}
.prose-article th{background:var(--brand-50);color:var(--brand-900);font-weight:600}
.prose-article tbody tr:nth-child(even){background:#FAFCFE}
.prose-article code{background:var(--page);border:1px solid var(--line);border-radius:6px;padding:1px 6px;font-size:14px}
.empty-state{
  border:1px dashed var(--line);border-radius:var(--r-card);background:#fff;
  padding:52px 24px;text-align:center;color:var(--ink-soft);
}
.empty-state .icon{width:34px;height:34px;color:var(--brand-500);margin:0 auto 12px}
.empty-state p{font-size:15px;margin-top:6px}

/* ============ 侧栏 ============ */
.side-col{position:sticky;top:calc(var(--nav-h) + 16px)}
.side-card{background:#fff;border:1px solid var(--line);border-radius:var(--r-card);padding:20px;box-shadow:var(--shadow-card)}
.side-card h3{font-size:15px;font-weight:600;color:var(--brand-900);margin-bottom:12px}
.toc-list{list-style:none;font-size:14px}
.toc-list li + li{margin-top:9px}
.toc-list a{color:var(--ink-soft)}
.toc-list a:hover{color:var(--brand-700);text-decoration:underline;text-underline-offset:4px}
.share-row{display:flex;gap:8px;margin-top:16px;flex-wrap:wrap}
.share-btn{
  width:38px;height:38px;border-radius:10px;border:1px solid var(--line);background:#fff;color:var(--ink-soft);
  display:grid;place-items:center;transition:.18s ease;
}
.share-btn:hover{background:var(--brand-50);color:var(--brand-700);border-color:var(--brand-100)}

/* ============ 下载引导 ============ */
.dl-band{
  margin-top:52px;background:var(--brand-50);border:1px solid var(--brand-100);border-radius:20px;
  padding:28px 30px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:22px;
}
.dl-band h3{font-size:20px;font-weight:600;color:var(--brand-900)}
.dl-band p{font-size:14.5px;color:var(--ink-soft);margin-top:6px;max-width:520px}
.dl-actions{display:flex;flex-wrap:wrap;gap:10px}

/* ============ 相关推荐 ============ */
.related{margin-top:64px}
.related-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;flex-wrap:wrap}
.related-head h2{font-size:24px;font-weight:600;letter-spacing:-.2px}
.related-head p{font-size:14px;color:var(--ink-mute);margin-top:6px}
.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;margin-top:24px}
.rec-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;
  box-shadow:var(--shadow-card);display:flex;flex-direction:column;
  transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease;
}
.rec-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover);border-color:var(--brand-100)}
.rec-thumb{aspect-ratio:16/10;overflow:hidden;background:var(--brand-50)}
.rec-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .25s ease}
.rec-card:hover .rec-thumb img{transform:scale(1.03)}
.rec-body{padding:18px 20px 20px;display:flex;flex-direction:column;gap:10px;flex:1}
.rec-body h3{font-size:17px;font-weight:600;line-height:1.5;color:var(--ink)}
.rec-card:hover .rec-body h3{color:var(--brand-700)}
.rec-body p{font-size:14px;color:var(--ink-soft);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.rec-meta{margin-top:auto;font-size:13px;color:var(--ink-mute);display:flex;align-items:center;gap:8px}
.back-links{display:flex;flex-wrap:wrap;gap:22px;margin-top:40px;font-size:14.5px}

/* ============ 页脚 ============ */
.site-footer{background:var(--brand-900);color:#C8DAEA;margin-top:8px;padding:64px 0 26px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px}
.footer-brand{display:flex;align-items:center;gap:12px;font-size:17px;font-weight:700;color:#fff}
.footer-brand .logo-mark{width:38px;height:38px;flex:0 0 38px;font-size:18px;background:linear-gradient(140deg,var(--brand-500),#5FB3E8)}
.footer-desc{font-size:14px;line-height:1.85;color:#9FB6CB;margin-top:16px;max-width:360px}
.footer-col h3{font-size:15px;font-weight:600;color:#fff;margin-bottom:14px}
.footer-col ul{list-style:none;display:flex;flex-direction:column;gap:10px}
.footer-col a{font-size:14px;color:#9FB6CB}
.footer-col a:hover{color:#fff}
.footer-bottom{
  margin-top:44px;padding-top:20px;border-top:1px solid rgba(255,255,255,.14);
  display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;font-size:13px;color:#8FA8BE;
}
.footer-bottom a{color:#8FA8BE}
.footer-bottom a:hover{color:#fff}

/* ============ 响应式 ============ */
@media (max-width:1024px){
  .nav-links{
    position:fixed;left:16px;right:16px;top:calc(var(--nav-h) - 6px);
    flex-direction:column;align-items:stretch;gap:4px;display:none;
    background:#fff;border:1px solid var(--line);border-radius:16px;padding:12px;
    box-shadow:var(--shadow-hover);margin-left:0;
  }
  .nav-links.is-open{display:flex}
  .nav-links a{font-size:17px;padding:12px 14px}
  .nav-search{display:none}
  .nav-toggle{display:inline-flex}
  .article-grid{grid-template-columns:minmax(0,1fr);gap:36px}
  .side-col{display:none}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .related-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:768px){
  .container-x{padding:0 16px}
  .article-hero{padding:calc(var(--nav-h) + 26px) 0 30px}
  .article-hero .hero-bg{display:none}
  .article-main{padding:38px 0 56px}
  .prose-article{font-size:15.5px}
  .prose-article h2{font-size:22px;margin-top:32px}
  .prose-article h3{font-size:18px;margin-top:24px}
  .prose-article table,.prose-article thead,.prose-article tbody,.prose-article tr,.prose-article th,.prose-article td{display:block;width:100%}
  .prose-article thead{display:none}
  .prose-article tr{border:1px solid var(--line);border-radius:12px;margin-bottom:12px;overflow:hidden;background:#fff}
  .prose-article td{border:0;border-bottom:1px solid var(--line)}
  .prose-article td:last-child{border-bottom:0}
  .dl-band{padding:24px 20px}
  .dl-actions{width:100%;flex-direction:column}
  .dl-actions .btn{width:100%}
  .related-grid{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .btn{padding:14px 22px}
}
@media (max-width:520px){
  .logo-text{font-size:15px}
  .logo-sub{font-size:9.5px}
  .meta-row{font-size:13px}
  .breadcrumb{font-size:13px}
  .breadcrumb .current{max-width:200px}
}

/* roulang page: category1 */
:root{
  --brand-50:#EFF7FD;
  --brand-100:#DCEEFB;
  --brand-500:#1C86D1;
  --brand-600:#0F6FB8;
  --brand-700:#0B5490;
  --brand-900:#072E4F;
  --accent:#FF7A3D;
  --accent-hover:#EA6428;
  --mint:#12B5A6;
  --ink:#0B1F33;
  --muted:#4A6076;
  --soft:#8A9BAE;
  --line:#E3EBF3;
  --page:#F5F9FD;
  --card:#FFFFFF;
  --radius:16px;
  --shadow:0 1px 2px rgba(7,46,79,.06),0 12px 32px -12px rgba(7,46,79,.16);
  --shadow-hover:0 2px 4px rgba(7,46,79,.06),0 20px 44px -18px rgba(7,46,79,.24);
  --nav-h:88px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Arial,sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--ink);
  background:var(--page);
  -webkit-font-smoothing:antialiased;
  font-variant-numeric:tabular-nums;
}
img{max-width:100%;display:block;border-style:none}
a{color:var(--brand-600);text-decoration:none;transition:color .18s ease}
a:hover{color:var(--brand-700);text-decoration:underline;text-underline-offset:4px}
h1,h2,h3,h4{margin:0;color:var(--ink);letter-spacing:-.01em}
p{margin:0}
ul,ol{margin:0;padding:0}
button{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--brand-500);outline-offset:2px;border-radius:6px}

.container-x{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}
.shell{max-width:1600px;margin:0 auto}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:14px 26px;border-radius:12px;border:1px solid transparent;
  font-size:15px;font-weight:600;line-height:1;cursor:pointer;
  transition:background .2s ease,color .2s ease,transform .2s ease,box-shadow .2s ease,border-color .2s ease;
  white-space:nowrap;
}
.btn:hover{text-decoration:none}
.btn--primary{background:var(--accent);color:#fff;box-shadow:0 10px 24px -12px rgba(255,122,61,.9)}
.btn--primary:hover{background:var(--accent-hover);color:#fff;transform:translateY(-2px)}
.btn--primary:active{transform:translateY(0)}
.btn--ghost{background:#fff;color:var(--brand-700);border-color:var(--line)}
.btn--ghost:hover{background:var(--brand-50);border-color:#BFDFF5;color:var(--brand-700);transform:translateY(-2px)}
.btn--ghost:active{transform:translateY(0)}
.btn--sm{padding:10px 18px;font-size:14px}
.btn--pill{border-radius:999px}
.btn--block{width:100%}
.btn--text{
  background:transparent;color:var(--brand-600);padding:14px 4px;font-weight:600;
}
.btn--text:hover{color:var(--brand-700);text-decoration:none}
.btn--text .arw{transition:transform .2s ease;display:inline-block}
.btn--text:hover .arw{transform:translateX(3px)}

/* ---------- 徽章 / 标签 ---------- */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  font-size:13px;font-weight:600;line-height:1;
  padding:7px 12px;border-radius:8px;
}
.badge--brand{background:var(--brand-50);color:var(--brand-700)}
.badge--mint{background:rgba(18,181,166,.12);color:#0C8579}
.badge--info{background:#F5F9FD;color:var(--muted);border:1px solid var(--line)}

.eyebrow{
  display:inline-block;font-size:13px;font-weight:600;letter-spacing:.08em;
  color:var(--brand-600);text-transform:uppercase;margin-bottom:14px;
}
.eyebrow--light{color:#7FD3CA}

/* ---------- 导航 ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:60;
  background:rgba(255,255,255,.62);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid rgba(255,255,255,.7);
  box-shadow:0 1px 2px rgba(7,46,79,.06);
  transition:background .2s ease,box-shadow .2s ease;
}
.site-header.is-solid{
  background:rgba(255,255,255,.96);
  box-shadow:0 8px 28px -16px rgba(7,46,79,.32);
}
.nav-inner{height:var(--nav-h);display:flex;align-items:center;gap:22px;transition:height .2s ease}
.site-header.is-solid .nav-inner{height:72px}
.logo{display:flex;align-items:center;gap:11px;text-decoration:none;flex:0 0 auto}
.logo:hover{text-decoration:none}
.logo-mark{
  width:38px;height:38px;border-radius:11px;background:var(--brand-600);color:#fff;
  display:grid;place-items:center;font-size:19px;font-weight:700;flex:0 0 auto;line-height:1;
}
.logo-text{display:block;font-size:16px;font-weight:700;color:var(--ink);line-height:1.25;letter-spacing:-.01em}
.logo-sub{display:block;font-size:10px;letter-spacing:.16em;color:var(--soft);line-height:1.3}
.nav-links{display:flex;align-items:center;gap:4px;margin-left:auto}
.nav-links a{
  font-size:15px;font-weight:500;color:var(--ink);
  padding:9px 12px;border-radius:10px;transition:background .18s ease,color .18s ease;
}
.nav-links a:hover{background:var(--brand-50);color:var(--brand-700);text-decoration:none}
.nav-links a.active{background:var(--brand-50);color:var(--brand-700);font-weight:600}
.nav-right{display:flex;align-items:center;gap:12px;flex:0 0 auto}
.nav-search{
  display:inline-flex;align-items:center;gap:8px;height:40px;padding:0 16px;
  border-radius:999px;border:1px solid var(--line);background:rgba(255,255,255,.72);
  font-size:14px;color:var(--muted);transition:background .18s ease,color .18s ease,border-color .18s ease;
}
.nav-search:hover{background:#fff;color:var(--brand-600);border-color:#BFDFF5;text-decoration:none}
.nav-toggle{
  display:none;width:44px;height:44px;border-radius:12px;border:1px solid var(--line);
  background:#fff;cursor:pointer;position:relative;padding:0;
}
.nav-toggle span{display:none}
.nav-toggle::before,.nav-toggle::after{
  content:"";position:absolute;left:50%;width:18px;height:2px;border-radius:2px;
  background:var(--ink);transform:translateX(-50%);transition:transform .2s ease,top .2s ease;
}
.nav-toggle::before{top:17px}
.nav-toggle::after{top:25px}
.nav-toggle[aria-expanded="true"]::before{top:21px;transform:translateX(-50%) rotate(45deg)}
.nav-toggle[aria-expanded="true"]::after{top:21px;transform:translateX(-50%) rotate(-45deg)}
.nav-overlay{
  position:fixed;inset:0;background:rgba(7,46,79,.45);opacity:0;pointer-events:none;
  transition:opacity .2s ease;z-index:55;
}
.nav-overlay.show{opacity:1;pointer-events:auto}

/* ---------- 主体与首屏 ---------- */
.page-main{padding-top:var(--nav-h)}
.hero{position:relative;padding:10px 0 96px;background:linear-gradient(180deg,#EFF7FD 0%,#F5F9FD 100%);overflow:hidden}
.hero::after{
  content:"";position:absolute;right:-120px;top:-80px;width:420px;height:420px;border-radius:50%;
  background:radial-gradient(circle,rgba(28,134,209,.14),rgba(28,134,209,0) 68%);
}
.crumbs{display:flex;align-items:center;gap:9px;font-size:14px;color:var(--soft);padding:18px 0 30px;position:relative;z-index:1}
.crumbs a{color:var(--brand-600);font-weight:500}
.crumbs .sep{color:#BFD2E1}
.crumbs .current{color:var(--soft)}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;position:relative;z-index:1}
.hero h1{font-size:clamp(30px,4.1vw,46px);font-weight:700;line-height:1.2;margin:16px 0 18px}
.hero-sub{font-size:17px;line-height:1.85;color:var(--muted);max-width:560px}
.hero-actions{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin:30px 0 18px}
.hero-note{font-size:13px;color:var(--soft)}
.hero-media{margin:0;position:relative}
.hero-media img{
  width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:20px;
  box-shadow:0 26px 60px -26px rgba(7,46,79,.42);background:var(--brand-100);
}
.float-card{
  position:absolute;left:-20px;bottom:-22px;display:flex;align-items:center;gap:14px;
  background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px 20px;
  box-shadow:var(--shadow);max-width:250px;
}
.stat-num{font-size:32px;font-weight:600;color:var(--brand-600);line-height:1}
.stat-label{font-size:13px;color:var(--muted);line-height:1.5}

/* ---------- 板块通用 ---------- */
.section{padding:96px 0}
.section--tight{padding-top:0}
.section-head{max-width:720px;margin-bottom:44px}
.section-head h2{font-size:clamp(24px,3vw,32px);font-weight:600;margin:10px 0 14px;line-height:1.3}
.section-head p{font-size:16px;color:var(--muted);line-height:1.85}
.section-head--center{margin-left:auto;margin-right:auto;text-align:center}

/* ---------- 功能卡片网格 ---------- */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);transition:transform .22s ease,box-shadow .22s ease,border-color .22s ease;
}
.card:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.feature-card{padding:28px;display:flex;flex-direction:column;gap:12px}
.feature-card .ic{
  width:44px;height:44px;border-radius:12px;background:var(--brand-50);color:var(--brand-600);
  display:grid;place-items:center;margin-bottom:4px;
}
.feature-card .ic svg{width:22px;height:22px}
.feature-card h3{font-size:18px;font-weight:600;line-height:1.45}
.feature-card p{font-size:15px;line-height:1.75;color:var(--muted)}
.feature-card .text-link{margin-top:auto}
.text-link{
  display:inline-flex;align-items:center;gap:6px;font-size:15px;font-weight:600;color:var(--brand-600);
}
.text-link:hover{color:var(--brand-700);text-decoration:none}
.text-link .arw{transition:transform .2s ease}
.text-link:hover .arw{transform:translateX(3px)}
.feature-card--lead{grid-column:span 2;flex-direction:row;gap:0;padding:0;overflow:hidden}
.feature-card--lead .feature-media{flex:0 0 42%;width:42%;background:var(--brand-100)}
.feature-card--lead .feature-media img{width:100%;height:100%;object-fit:cover;aspect-ratio:4/3}
.feature-card--lead .feature-body{padding:32px;display:flex;flex-direction:column;gap:12px;justify-content:center}

/* ---------- 图文错落流 ---------- */
.flow{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.flow + .flow{margin-top:76px;padding-top:76px;border-top:1px solid var(--line)}
.flow-media{margin:0}
.flow-media img{
  width:100%;aspect-ratio:16/11;object-fit:cover;border-radius:16px;
  border:1px solid var(--line);box-shadow:var(--shadow);background:var(--brand-100);
}
.flow h3{font-size:22px;font-weight:600;margin-bottom:12px;line-height:1.4}
.flow p{font-size:15px;line-height:1.8;color:var(--muted)}
.flow-list{list-style:none;margin:22px 0 26px;display:grid;gap:12px}
.flow-list li{display:flex;gap:11px;font-size:15px;line-height:1.7;color:var(--muted)}
.flow-list li::before{
  content:"";flex:0 0 auto;width:6px;height:6px;border-radius:2px;background:var(--brand-500);margin-top:10px;
}

/* ---------- 深色环境板块 ---------- */
.dark-section{background:var(--brand-900);color:#CFE2F1;padding:96px 0}
.dark-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:start}
.dark-section h2{color:#fff;font-size:clamp(24px,3vw,32px);font-weight:600;line-height:1.3;margin:10px 0 16px}
.dark-section p{color:#9FBBD2;font-size:15px;line-height:1.85}
.dark-stats{display:flex;flex-wrap:wrap;gap:34px;margin-top:32px}
.dark-stats .num{font-size:32px;font-weight:600;color:#fff;line-height:1}
.dark-stats .lbl{font-size:13px;color:#8FA9C0;margin-top:8px}
.check-panel{
  background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.13);
  border-radius:16px;padding:30px;
}
.check-panel h3{color:#fff;font-size:16px;font-weight:600;margin-bottom:18px}
.check-list{list-style:none;display:grid;gap:14px}
.check-list li{display:flex;gap:12px;font-size:15px;line-height:1.7;color:#BBD3E6}
.check-list svg{width:20px;height:20px;color:var(--mint);flex:0 0 auto;margin-top:4px}

/* ---------- FAQ ---------- */
.faq-wrap{max-width:880px;margin:0 auto;display:grid;gap:14px}
.faq{
  background:#fff;border:1px solid var(--line);border-radius:16px;
  box-shadow:var(--shadow);overflow:hidden;transition:border-color .2s ease,box-shadow .2s ease;
}
.faq[open]{border-color:#BBDDF6;box-shadow:var(--shadow-hover)}
.faq summary{
  list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:18px;
  padding:20px 24px;font-size:17px;font-weight:600;color:var(--ink);
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{
  content:"";flex:0 0 auto;width:9px;height:9px;margin-top:-5px;
  border-right:2px solid var(--brand-500);border-bottom:2px solid var(--brand-500);
  transform:rotate(45deg);transition:transform .2s ease,margin .2s ease;
}
.faq[open] summary::after{transform:rotate(-135deg);margin-top:5px}
.faq summary:hover{color:var(--brand-700)}
.faq-body{
  font-size:15px;line-height:1.85;color:var(--muted);
  padding:0 24px 22px 22px;margin-left:24px;border-left:3px solid var(--brand-500);
}

/* ---------- 收尾 CTA ---------- */
.cta-band{padding:0 0 96px}
.cta-inner{
  background:var(--brand-50);border:1px solid var(--brand-100);border-radius:24px;
  padding:48px;display:flex;align-items:center;justify-content:space-between;gap:36px;flex-wrap:wrap;
}
.cta-inner h2{font-size:clamp(22px,2.6vw,28px);font-weight:600;line-height:1.35;margin-bottom:10px}
.cta-inner p{font-size:15px;color:var(--muted);line-height:1.8;max-width:520px}
.cta-actions{display:flex;gap:14px;flex-wrap:wrap}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--brand-900);color:#C7D8E8;padding:72px 0 28px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px}
.footer-brand{display:flex;align-items:center;gap:11px;color:#fff;font-size:18px;font-weight:700}
.site-footer .logo-mark{background:#fff;color:var(--brand-900)}
.footer-desc{color:#8FA9C0;font-size:14px;line-height:1.85;margin-top:18px;max-width:340px}
.footer-col h3{font-size:15px;font-weight:600;color:#fff;margin-bottom:16px}
.footer-col ul{list-style:none;display:grid;gap:11px}
.footer-col a{color:#A9C2D6;font-size:14px;transition:color .18s ease}
.footer-col a:hover{color:#fff;text-decoration:none}
.footer-bottom{
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  border-top:1px solid rgba(255,255,255,.14);margin-top:48px;padding-top:22px;
  font-size:13px;color:#8FA9C0;
}
.footer-bottom a{color:#8FA9C0}
.footer-bottom a:hover{color:#fff}

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  :root{--nav-h:76px}
  .nav-toggle{display:block}
  .nav-search{display:none}
  .nav-links{
    display:none;position:absolute;top:calc(100% + 10px);left:16px;right:16px;
    flex-direction:column;align-items:stretch;gap:4px;margin:0;padding:14px;
    background:#fff;border:1px solid var(--line);border-radius:16px;
    box-shadow:0 24px 52px -20px rgba(7,46,79,.4);z-index:80;
  }
  .nav-links.open{display:flex}
  .nav-links a{font-size:17px;padding:13px 14px;border-radius:12px}
  .hero{padding-bottom:72px}
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .hero-media{max-width:600px}
  .float-card{left:12px;bottom:-18px}
  .section,.dark-section{padding:72px 0}
  .cta-band{padding-bottom:72px}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .feature-card--lead{grid-column:span 2;flex-direction:column}
  .feature-card--lead .feature-media{flex:0 0 auto;width:100%}
  .feature-card--lead .feature-media img{aspect-ratio:16/9}
  .flow{grid-template-columns:1fr;gap:32px}
  .flow + .flow{margin-top:56px;padding-top:56px}
  .dark-grid{grid-template-columns:1fr;gap:32px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:34px}
}
@media (max-width:640px){
  :root{--nav-h:68px}
  .container-x{padding:0 16px}
  .logo-text{font-size:15px}
  .nav-right .btn{display:none}
  .hero{padding-bottom:56px}
  .hero-actions{flex-direction:column;align-items:stretch;gap:10px}
  .hero-actions .btn--text{justify-content:center}
  .hero-note{font-size:12.5px}
  .float-card{position:static;margin-top:16px;max-width:none}
  .section,.dark-section{padding:56px 0}
  .section--tight{padding-top:0}
  .feature-grid{grid-template-columns:1fr;gap:16px}
  .feature-card--lead{grid-column:span 1}
  .feature-card--lead .feature-body{padding:24px}
  .feature-card{padding:22px}
  .cta-inner{padding:28px;border-radius:18px}
  .cta-actions{flex-direction:column;width:100%}
  .cta-actions .btn{width:100%}
  .check-panel{padding:22px}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-bottom{flex-direction:column;gap:8px}
  .dark-stats{gap:24px}
}

/* roulang page: category2 */
:root{
  --brand-50:#EFF7FD; --brand-100:#DCEEFB; --brand-500:#1C86D1; --brand-600:#0F6FB8; --brand-700:#0B5490; --brand-900:#072E4F;
  --accent:#FF7A3D; --accent-hover:#EA6428; --mint:#12B5A6; --mint-deep:#0B7F74;
  --ink:#0B1F33; --muted:#4A6076; --soft:#8A9BAE; --line:#E3EBF3; --page:#F5F9FD; --card:#FFFFFF;
  --r-card:16px; --r-btn:12px; --r-img:12px;
  --shadow-card:0 1px 2px rgba(7,46,79,.06), 0 12px 32px -12px rgba(7,46,79,.16);
  --shadow-card-hover:0 2px 4px rgba(7,46,79,.08), 0 20px 44px -16px rgba(7,46,79,.24);
  --ease:cubic-bezier(.4,.1,.2,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--page);color:var(--ink);
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Arial,sans-serif;
  font-size:16px;line-height:1.75;font-variant-numeric:tabular-nums;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border-style:none}
a{color:var(--brand-600);text-decoration:none;transition:color .2s var(--ease)}
a:hover{color:var(--brand-700)}
p{margin:0 0 16px}
h1,h2,h3,h4{margin:0;font-weight:600;line-height:1.3;color:var(--ink)}
ul,ol{margin:0;padding:0;list-style:none}
button{font:inherit;cursor:pointer;border:0;background:none;color:inherit}
summary{list-style:none}
summary::-webkit-details-marker{display:none}
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible{outline:2px solid var(--brand-500);outline-offset:2px;border-radius:8px}
.icon{width:20px;height:20px;display:inline-block;vertical-align:-4px;flex:none}
.container-x{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}
.section{padding:96px 0}
.section--tight{padding:72px 0}
.section-head{max-width:760px;margin:0 0 40px}
.section-head h2{font-size:clamp(24px,3vw,32px);margin-bottom:12px}
.section-head p{color:var(--muted);margin:0}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;letter-spacing:.06em;color:var(--brand-700);text-transform:uppercase;margin-bottom:14px}
.eyebrow::before{content:"";width:6px;height:6px;border-radius:2px;background:var(--accent)}

/* 顶部导航 */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:60;height:88px;display:flex;align-items:center;
  background:rgba(255,255,255,.62);
  -webkit-backdrop-filter:blur(14px) saturate(140%);backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid rgba(255,255,255,.65);
  box-shadow:0 8px 26px -20px rgba(7,46,79,.5);
  transition:height .2s var(--ease),background .2s var(--ease),box-shadow .2s var(--ease),border-color .2s var(--ease);
}
.site-header.is-stuck{height:72px;background:rgba(255,255,255,.96);border-bottom-color:var(--line);box-shadow:0 10px 30px -24px rgba(7,46,79,.6)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:24px}
.logo{display:flex;align-items:center;gap:12px;color:var(--ink);flex:none}
.logo-mark{width:40px;height:40px;border-radius:12px;background:linear-gradient(135deg,var(--brand-500),var(--brand-700));color:#fff;display:grid;place-items:center;font-weight:700;font-size:18px;flex:none}
.logo-text{display:block;font-size:17px;font-weight:700;line-height:1.15;letter-spacing:.2px}
.logo-sub{display:block;font-size:10px;font-weight:600;letter-spacing:.22em;color:var(--soft)}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-links a{padding:9px 14px;border-radius:10px;font-size:15px;font-weight:500;color:var(--muted)}
.nav-links a:hover{color:var(--brand-700);background:var(--brand-50)}
.nav-links a.active{color:var(--brand-700);background:var(--brand-100)}
.nav-links a:active{transform:translateY(1px)}
.nav-right{display:flex;align-items:center;gap:12px;flex:none}
.nav-search{display:inline-flex;align-items:center;gap:8px;height:40px;padding:0 16px;border-radius:999px;border:1px solid var(--line);background:rgba(255,255,255,.82);color:var(--muted);font-size:14px}
.nav-search:hover{border-color:var(--brand-500);color:var(--brand-700);background:#fff}
.nav-toggle{display:none;width:42px;height:42px;border-radius:12px;border:1px solid var(--line);background:rgba(255,255,255,.9);align-items:center;justify-content:center;flex-direction:column;gap:4px}
.nav-toggle span,.nav-toggle::before,.nav-toggle::after{content:"";display:block;width:18px;height:2px;border-radius:2px;background:var(--ink);transition:transform .2s var(--ease),opacity .2s var(--ease)}
body.nav-open .nav-toggle span{opacity:0}
body.nav-open .nav-toggle::before{transform:translateY(6px) rotate(45deg)}
body.nav-open .nav-toggle::after{transform:translateY(-6px) rotate(-45deg)}
.nav-backdrop{position:fixed;inset:0;background:rgba(7,46,79,.42);opacity:0;visibility:hidden;transition:opacity .25s var(--ease),visibility .25s var(--ease);z-index:55}
body.nav-open .nav-backdrop{opacity:1;visibility:visible}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 26px;border-radius:var(--r-btn);font-size:15px;font-weight:600;border:1px solid transparent;transition:transform .2s var(--ease),background .2s var(--ease),box-shadow .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease)}
.btn--primary{background:var(--accent);color:#fff;box-shadow:0 12px 26px -14px rgba(255,122,61,.85)}
.btn--primary:hover{background:var(--accent-hover);color:#fff;transform:translateY(-2px);box-shadow:0 18px 32px -14px rgba(255,122,61,.9)}
.btn--primary:active{transform:translateY(0)}
.btn--ghost{background:#fff;border-color:var(--line);color:var(--brand-700)}
.btn--ghost:hover{background:var(--brand-50);border-color:var(--brand-500);transform:translateY(-2px)}
.btn--ghost:active{transform:translateY(0)}
.btn--sm{padding:9px 18px;font-size:14px}
.btn--pill{border-radius:999px}
.btn--block{width:100%}
.link-arrow{display:inline-flex;align-items:center;gap:6px;font-weight:600;font-size:15px;color:var(--brand-600);text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:1px;text-decoration-color:rgba(28,134,209,.35)}
.link-arrow:hover{color:var(--brand-700);text-decoration-color:var(--brand-700)}
.link-arrow:hover .icon{transform:translateX(3px)}
.link-arrow .icon{transition:transform .2s var(--ease);width:16px;height:16px}

/* 徽章 */
.badge{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:600;padding:5px 12px;border-radius:8px;line-height:1.5}
.badge--brand{background:var(--brand-50);color:var(--brand-700)}
.badge--mint{background:rgba(18,181,166,.13);color:var(--mint-deep)}
.badge--info{background:var(--page);color:var(--muted);border:1px solid var(--line)}

/* 面包屑 */
.crumb{font-size:13px;color:var(--soft);display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:22px}
.crumb a{color:var(--brand-600)}
.crumb span.sep{color:var(--soft)}
.crumb .now{color:var(--soft)}

/* Hero */
.page-hero{
  position:relative;padding-top:calc(88px + 64px);padding-bottom:80px;
  background-color:var(--page);
  background-image:linear-gradient(180deg,rgba(245,249,253,.88),rgba(245,249,253,.96)),url('/assets/images/backpic/back-2.png');
  background-size:cover;background-position:center;border-bottom:1px solid var(--line)
}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero-copy h1{font-size:clamp(30px,4.2vw,48px);line-height:1.2;font-weight:700;letter-spacing:-.01em;margin-bottom:18px}
.hero-copy h1 .hl{color:var(--brand-600)}
.hero-lead{font-size:17px;color:var(--muted);max-width:56ch;margin-bottom:26px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:20px}
.hero-meta{font-size:13px;color:var(--soft);display:flex;flex-wrap:wrap;gap:8px 18px}
.hero-meta b{color:var(--muted);font-weight:600}
.hero-media{position:relative;border-radius:20px;overflow:hidden;aspect-ratio:4/3;box-shadow:var(--shadow-card);border:1px solid var(--line);background:var(--brand-50)}
.hero-media img{width:100%;height:100%;object-fit:cover}
.hero-float{position:absolute;left:20px;bottom:20px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px 18px;box-shadow:var(--shadow-card)}
.hero-float .num{font-size:26px;font-weight:600;color:var(--brand-600);line-height:1.1}
.hero-float .cap{font-size:12px;color:var(--soft)}

/* 版本信息条 */
.trust-strip{background:#fff;border-bottom:1px solid var(--line)}
.trust-grid{display:grid;grid-template-columns:repeat(4,1fr);padding:26px 0}
.trust-item{padding:0 24px;border-left:1px solid var(--line)}
.trust-item:first-child{border-left:0;padding-left:0}
.trust-item .num{font-size:26px;font-weight:600;color:var(--brand-900);line-height:1.2}
.trust-item .cap{font-size:13px;color:var(--soft)}

/* 参数卡 */
.spec-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.spec-card{display:flex;gap:14px;align-items:flex-start;background:var(--card);border:1px solid var(--line);border-radius:var(--r-card);padding:20px 22px;box-shadow:var(--shadow-card);transition:transform .2s var(--ease),box-shadow .2s var(--ease),border-color .2s var(--ease)}
.spec-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-card-hover);border-color:var(--brand-100)}
.spec-icon{width:42px;height:42px;border-radius:12px;background:var(--brand-50);color:var(--brand-600);display:grid;place-items:center;flex:none}
.spec-card h3{font-size:17px;margin-bottom:4px}
.spec-card p{margin:0;font-size:14px;color:var(--muted)}
.spec-value{font-weight:600;color:var(--brand-700)}
.spec-note{font-size:13px;color:var(--soft);margin-top:18px;display:flex;flex-wrap:wrap;align-items:center;gap:10px}

/* 时间线 */
.timeline{position:relative;margin-top:8px}
.timeline::before{content:"";position:absolute;left:19px;top:12px;bottom:12px;width:1px;background:linear-gradient(180deg,var(--brand-100),var(--brand-500))}
.timeline-item{position:relative;padding-left:70px;padding-bottom:44px}
.timeline-item:last-child{padding-bottom:0}
.timeline-dot{position:absolute;left:0;top:0;width:40px;height:40px;border-radius:999px;background:#fff;border:1px solid var(--line);color:var(--brand-700);display:grid;place-items:center;font-weight:700;font-size:15px;box-shadow:0 1px 2px rgba(7,46,79,.06)}
.timeline-item h3{font-size:20px;margin-bottom:8px}
.timeline-item p{color:var(--muted);font-size:15px;margin-bottom:12px;max-width:64ch}
.timeline-tags{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:16px}
.media{position:relative;border-radius:var(--r-img);overflow:hidden;background:var(--brand-50);border:1px solid var(--line);aspect-ratio:16/10}
.media img{width:100%;height:100%;object-fit:cover}
.media.is-fallback{background:linear-gradient(135deg,var(--brand-50),var(--brand-100))}
.step-media{max-width:620px}

/* 深色校验区 */
.check-band{background:var(--brand-900);border-radius:24px;padding:56px;color:#D6E5F2;position:relative;overflow:hidden}
.check-band::after{content:"";position:absolute;right:-60px;top:-60px;width:220px;height:220px;border-radius:50%;background:rgba(28,134,209,.22);filter:blur(6px)}
.check-band h2{color:#fff;font-size:clamp(22px,2.6vw,30px);margin-bottom:12px}
.check-band .band-lead{color:#A9C2D8;max-width:60ch;margin-bottom:36px}
.check-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;position:relative;z-index:1}
.check-item{border-top:1px solid rgba(255,255,255,.16);padding-top:20px}
.check-item .check-icon{width:44px;height:44px;border-radius:12px;background:rgba(18,181,166,.18);color:#5FE0D3;display:grid;place-items:center;margin-bottom:16px}
.check-item h3{color:#fff;font-size:17px;margin-bottom:8px}
.check-item p{color:#A9C2D8;font-size:14px;margin:0}

/* FAQ */
.faq-list{max-width:880px;margin:0 auto;display:grid;gap:14px}
.faq-item{background:var(--card);border:1px solid var(--line);border-radius:var(--r-card);box-shadow:var(--shadow-card);padding:18px 24px;transition:border-color .2s var(--ease),box-shadow .2s var(--ease)}
.faq-item:hover{box-shadow:var(--shadow-card-hover)}
.faq-item[open]{border-color:var(--brand-100)}
.faq-item summary{display:flex;align-items:center;justify-content:space-between;gap:16px;font-size:17px;font-weight:600;color:var(--ink);cursor:pointer}
.faq-icon{width:22px;height:22px;color:var(--brand-500);transition:transform .22s var(--ease);flex:none}
.faq-item[open] .faq-icon{transform:rotate(180deg)}
.faq-body{margin-top:14px;padding-left:14px;border-left:3px solid var(--brand-100);font-size:15px;line-height:1.8;color:var(--muted)}
.faq-body p{margin:0 0 10px}
.faq-body p:last-child{margin-bottom:0}

/* 下载 CTA */
.cta-band{background:#fff;border:1px solid var(--line);border-radius:24px;padding:48px;box-shadow:var(--shadow-card);display:grid;grid-template-columns:1.5fr .8fr;gap:40px;align-items:center}
.cta-band h2{font-size:clamp(22px,2.6vw,30px);margin-bottom:12px}
.cta-band p{color:var(--muted);max-width:52ch;margin-bottom:26px}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px}
.qr-card{background:var(--page);border:1px dashed var(--line);border-radius:16px;padding:22px;text-align:center}
.qr-card .qr-box{width:140px;height:140px;margin:0 auto 14px;background:#fff;border:1px solid var(--line);border-radius:12px;display:grid;place-items:center}
.qr-card .qr-cap{font-size:13px;color:var(--muted);font-weight:600}
.qr-card .qr-note{font-size:12px;color:var(--soft);margin-top:6px}

/* 页脚 */
.site-footer{background:var(--brand-900);color:#C3D6E8;margin-top:96px;padding:72px 0 0}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px}
.footer-brand{display:flex;align-items:center;gap:12px;color:#fff;font-weight:700;font-size:17px;margin-bottom:16px}
.footer-desc{color:#A9C2D8;font-size:14px;max-width:40ch;margin:0}
.footer-col h3{font-size:15px;font-weight:600;color:#fff;margin-bottom:16px}
.footer-col ul{display:grid;gap:10px}
.footer-col a{color:#A9C2D8;font-size:14px}
.footer-col a:hover{color:#fff;text-decoration:underline;text-underline-offset:4px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:48px;padding:22px 0;display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;font-size:13px;color:#8FA9C0}
.footer-bottom a{color:#A9C2D8}

@media (max-width:1023px){
  .section{padding:72px 0}
  .section--tight{padding:56px 0}
  .nav-links{
    position:fixed;top:0;right:0;height:100vh;width:min(320px,86vw);background:#fff;
    flex-direction:column;align-items:stretch;gap:4px;padding:96px 20px 28px;
    transform:translateX(105%);transition:transform .28s var(--ease);
    box-shadow:-24px 0 60px -30px rgba(7,46,79,.6);border-radius:16px 0 0 16px;overflow-y:auto;z-index:70
  }
  .nav-links.is-open{transform:translateX(0)}
  .nav-links a{font-size:17px;padding:14px 16px}
  .nav-toggle{display:inline-flex}
  .nav-search{display:none}
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .trust-grid{grid-template-columns:repeat(2,1fr);gap:22px 0}
  .trust-item:nth-child(odd){border-left:0;padding-left:0}
  .check-band{padding:40px 32px}
  .check-grid{grid-template-columns:1fr;gap:20px}
  .cta-band{grid-template-columns:1fr;padding:36px 28px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:36px}
}
@media (max-width:767px){
  .logo-sub{display:none}
  .logo-text{font-size:15px}
  .page-hero{padding-top:calc(88px + 40px);padding-bottom:56px}
  .spec-grid{grid-template-columns:1fr}
  .timeline-item{padding-left:54px;padding-bottom:36px}
  .timeline::before{left:15px}
  .timeline-dot{width:32px;height:32px;font-size:14px}
  .hero-actions .btn{width:100%}
  .cta-actions .btn{width:100%}
  .check-band{padding:32px 22px;border-radius:20px}
}
@media (max-width:520px){
  .container-x{padding:0 16px}
  .section{padding:56px 0}
  .trust-grid{grid-template-columns:1fr 1fr}
  .trust-item .num{font-size:22px}
  .footer-grid{grid-template-columns:1fr}
  .qr-card .qr-box{width:120px;height:120px}
}

/* roulang page: category3 */
:root{
    --brand-50:#EFF7FD; --brand-100:#DCEEFB; --brand-500:#1C86D1;
    --brand-600:#0F6FB8; --brand-700:#0B5490; --brand-900:#072E4F;
    --accent:#FF7A3D; --accent-dark:#EA6428; --mint:#12B5A6;
    --ink:#0B1F33; --ink-soft:#4A6076; --ink-mute:#8A9BAE;
    --line:#E3EBF3; --page:#F5F9FD; --card:#FFFFFF;
    --r-card:16px; --r-btn:12px; --r-img:12px;
    --sh-card:0 1px 2px rgba(7,46,79,.06), 0 12px 32px -12px rgba(7,46,79,.16);
    --sh-hover:0 2px 6px rgba(7,46,79,.08), 0 18px 42px -14px rgba(7,46,79,.26);
    --sh-nav:0 1px 2px rgba(7,46,79,.06), 0 10px 30px -18px rgba(7,46,79,.35);
    --nav-h:88px; --nav-h-sm:72px;
  }
  *,*::before,*::after{box-sizing:border-box}
  html{-webkit-text-size-adjust:100%}
  body{
    margin:0; font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
    color:var(--ink); background:var(--page); font-size:16px; line-height:1.75;
    font-variant-numeric:tabular-nums; -webkit-font-smoothing:antialiased;
  }
  img{max-width:100%; display:block; height:auto}
  a{color:var(--brand-600); text-decoration:none; transition:color .18s ease, text-decoration-color .18s ease}
  a:hover{color:var(--brand-700)}
  p{margin:0 0 16px}
  ul,ol{margin:0; padding:0; list-style:none}
  h1,h2,h3,h4{margin:0; font-weight:600; color:var(--ink); line-height:1.28}
  h1{font-size:40px; font-weight:700; letter-spacing:-.4px}
  h2{font-size:30px; letter-spacing:-.2px}
  h3{font-size:20px}
  button{font:inherit; color:inherit; background:none; border:0; cursor:pointer}
  input{font:inherit; color:inherit}
  :focus-visible{outline:2px solid var(--brand-500); outline-offset:2px; border-radius:6px}
  ::selection{background:var(--brand-100)}

  .container-x{width:100%; max-width:1200px; margin:0 auto; padding:0 24px}
  .icon{width:22px; height:22px; fill:none; stroke:currentColor; stroke-width:1.5; stroke-linecap:round; stroke-linejoin:round; flex:none}

  /* ---------- Header ---------- */
  .site-header{
    position:fixed; top:0; left:0; right:0; z-index:70;
    background:rgba(255,255,255,.62);
    -webkit-backdrop-filter:blur(14px) saturate(140%);
    backdrop-filter:blur(14px) saturate(140%);
    border-bottom:1px solid rgba(255,255,255,.66);
    box-shadow:var(--sh-nav);
    transition:background .2s ease, box-shadow .2s ease, border-color .2s ease;
  }
  .site-header.is-scrolled{background:rgba(255,255,255,.96); box-shadow:0 8px 28px -16px rgba(7,46,79,.42); border-bottom-color:var(--line)}
  .nav-inner{display:flex; align-items:center; gap:24px; height:var(--nav-h); transition:height .2s ease}
  .site-header.is-scrolled .nav-inner{height:var(--nav-h-sm)}
  .logo{display:flex; align-items:center; gap:12px; color:var(--ink); flex:none}
  .logo:hover{color:var(--ink)}
  .logo-mark{
    width:42px; height:42px; border-radius:12px; flex:none;
    background:linear-gradient(150deg,var(--brand-500),var(--brand-700));
    color:#fff; display:flex; align-items:center; justify-content:center;
    font-size:20px; font-weight:700; letter-spacing:-1px;
    box-shadow:0 8px 18px -10px rgba(15,111,184,.9);
  }
  .logo-text{display:block; font-size:17px; font-weight:700; line-height:1.2; letter-spacing:-.2px}
  .logo-sub{display:block; font-size:10.5px; letter-spacing:.16em; color:var(--ink-mute); line-height:1.4}
  .nav-links{display:flex; align-items:center; gap:4px; margin-left:8px}
  .nav-links a{
    position:relative; padding:10px 14px; border-radius:10px;
    font-size:15px; color:var(--ink-soft); white-space:nowrap;
    transition:color .18s ease, background-color .18s ease;
  }
  .nav-links a:hover{color:var(--brand-700); background:rgba(220,238,251,.6)}
  .nav-links a.active{color:var(--brand-700); font-weight:600}
  .nav-links a.active::after{
    content:""; position:absolute; left:14px; right:14px; bottom:2px; height:2px;
    border-radius:2px; background:var(--brand-500);
  }
  .nav-right{display:flex; align-items:center; gap:12px; margin-left:auto}
  .nav-search{
    display:inline-flex; align-items:center; gap:8px; height:42px; padding:0 16px;
    border:1px solid var(--line); border-radius:999px; background:rgba(255,255,255,.82);
    color:var(--ink-soft); font-size:14px; transition:border-color .18s, color .18s, background-color .18s;
  }
  .nav-search:hover{border-color:#BFDCF3; color:var(--brand-700); background:#fff}
  .nav-toggle{display:none; width:44px; height:44px; border-radius:12px; border:1px solid var(--line); background:#fff; position:relative}
  .nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{
    content:""; position:absolute; left:12px; width:20px; height:2px; border-radius:2px; background:var(--brand-900);
    transition:transform .22s ease, opacity .22s ease;
  }
  .nav-toggle span{top:21px}
  .nav-toggle span::before{top:-6px; left:0}
  .nav-toggle span::after{top:6px; left:0}
  .nav-toggle.is-open span{background:transparent}
  .nav-toggle.is-open span::before{transform:translateY(6px) rotate(45deg)}
  .nav-toggle.is-open span::after{transform:translateY(-6px) rotate(-45deg)}
  .nav-backdrop{
    position:fixed; inset:0; background:rgba(7,46,79,.42); opacity:0; pointer-events:none;
    transition:opacity .22s ease; z-index:65;
  }
  .nav-backdrop.is-open{opacity:1; pointer-events:auto}

  /* ---------- Buttons ---------- */
  .btn{
    display:inline-flex; align-items:center; justify-content:center; gap:8px;
    padding:14px 26px; border-radius:var(--r-btn); font-size:15px; font-weight:600;
    border:1px solid transparent; cursor:pointer; white-space:nowrap;
    transition:transform .18s ease, box-shadow .18s ease, background-color .18s ease, color .18s ease, border-color .18s ease;
  }
  .btn:active{transform:translateY(1px)}
  .btn--primary{background:var(--accent); color:#fff; box-shadow:0 12px 26px -14px rgba(234,100,40,.95)}
  .btn--primary:hover{background:var(--accent-dark); color:#fff; transform:translateY(-2px); box-shadow:0 16px 30px -14px rgba(234,100,40,.95)}
  .btn--ghost{background:#fff; color:var(--brand-700); border-color:var(--line); box-shadow:0 1px 2px rgba(7,46,79,.05)}
  .btn--ghost:hover{background:var(--brand-50); border-color:#BFDCF3; color:var(--brand-700); transform:translateY(-2px)}
  .btn--sm{padding:11px 20px; font-size:14px}
  .btn--pill{border-radius:999px}
  .btn--block{width:100%}
  .link-arrow{display:inline-flex; align-items:center; gap:6px; font-size:15px; font-weight:600; color:var(--brand-600)}
  .link-arrow .icon{width:18px; height:18px; transition:transform .18s ease}
  .link-arrow:hover{text-decoration:underline; text-underline-offset:4px}
  .link-arrow:hover .icon{transform:translateX(3px)}

  /* ---------- Badges & chips ---------- */
  .badge{display:inline-flex; align-items:center; gap:6px; padding:4px 10px; border-radius:8px; font-size:13px; font-weight:600; line-height:1.6}
  .badge--brand{background:var(--brand-50); color:var(--brand-700)}
  .badge--mint{background:rgba(18,181,166,.12); color:#0C8B80}
  .badge--info{background:#F5F9FD; color:var(--ink-soft); border:1px solid var(--line)}
  .chip{
    display:inline-flex; align-items:center; gap:8px; padding:9px 16px; border-radius:999px;
    background:#fff; border:1px solid var(--line); color:var(--ink-soft); font-size:14px;
    transition:border-color .18s, color .18s, background-color .18s, transform .18s;
  }
  .chip:hover{border-color:#BFDCF3; background:var(--brand-50); color:var(--brand-700); transform:translateY(-1px)}

  /* ---------- Section basics ---------- */
  .section{padding:96px 0}
  .section--tight{padding:72px 0}
  .section-head{max-width:760px; margin-bottom:40px}
  .section-head p{color:var(--ink-soft); margin:14px 0 0; font-size:16px}
  .eyebrow{display:inline-flex; align-items:center; gap:8px; font-size:13px; font-weight:600; letter-spacing:.08em; color:var(--brand-600); text-transform:uppercase; margin-bottom:14px}
  .eyebrow::before{content:""; width:6px; height:6px; border-radius:2px; background:var(--brand-500)}
  .rule{height:1px; background:var(--line); border:0; margin:0}
  .breadcrumb{display:flex; align-items:center; gap:8px; font-size:13.5px; color:var(--ink-mute); margin-bottom:20px}
  .breadcrumb a{color:var(--brand-600)}
  .breadcrumb span.current{color:var(--ink-mute)}

  /* ---------- Hero ---------- */
  .hero-help{
    position:relative; padding:calc(var(--nav-h) + 60px) 0 72px;
    background:
      radial-gradient(1100px 460px at 88% -10%, rgba(28,134,209,.16), transparent 62%),
      linear-gradient(180deg,#F7FBFF 0%, var(--page) 100%);
    overflow:hidden;
  }
  .hero-help::after{
    content:""; position:absolute; left:0; right:0; bottom:0; height:1px; background:var(--line);
  }
  .hero-grid{display:grid; grid-template-columns:1.15fr .85fr; gap:48px; align-items:center; position:relative; z-index:1}
  .hero-help h1{max-width:620px}
  .hero-sub{margin-top:18px; font-size:17px; color:var(--ink-soft); max-width:580px}
  .search-box{
    margin-top:28px; display:flex; align-items:center; gap:10px; background:#fff;
    border:1px solid var(--line); border-radius:14px; padding:8px 8px 8px 18px;
    box-shadow:var(--sh-card); max-width:600px; transition:border-color .18s, box-shadow .18s;
  }
  .search-box:hover{border-color:#BFDCF3}
  .search-box:focus-within{border-color:var(--brand-500); box-shadow:0 0 0 3px rgba(28,134,209,.12)}
  .search-box input{
    flex:1; min-width:0; border:0; outline:0; background:transparent; font-size:15px; height:44px;
  }
  .search-box input::placeholder{color:var(--ink-mute)}
  .hero-chips{display:flex; flex-wrap:wrap; gap:10px; margin-top:20px}
  .hero-visual{position:relative}
  .hero-visual .frame{
    border-radius:20px; overflow:hidden; border:1px solid var(--line); background:var(--brand-50);
    box-shadow:var(--sh-card);
  }
  .hero-visual .frame img{aspect-ratio:4/3; width:100%; object-fit:cover}
  .float-card{
    position:absolute; left:-18px; bottom:-22px; background:#fff; border:1px solid var(--line);
    border-radius:14px; padding:14px 18px; box-shadow:var(--sh-card); min-width:210px;
  }
  .float-card strong{display:block; font-size:26px; font-weight:600; color:var(--brand-600); line-height:1.2}
  .float-card span{font-size:12.5px; color:var(--ink-mute)}

  /* ---------- Entry chips grid ---------- */
  .entry-grid{
    display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:12px;
  }
  .entry-item{
    display:flex; align-items:center; gap:12px; padding:16px 18px; background:#fff;
    border:1px solid var(--line); border-radius:14px; color:var(--ink);
    transition:transform .18s ease, box-shadow .18s ease, border-color .18s ease;
  }
  .entry-item:hover{transform:translateY(-2px); box-shadow:var(--sh-hover); border-color:#CFE7F8}
  .entry-item .icon{color:var(--brand-600)}
  .entry-item b{display:block; font-size:15.5px; font-weight:600}
  .entry-item small{display:block; font-size:12.5px; color:var(--ink-mute)}

  /* ---------- Two column FAQ layout ---------- */
  .help-split{display:grid; grid-template-columns:300px minmax(0,1fr); gap:40px; align-items:start}
  .toc-card{
    position:sticky; top:112px; background:#fff; border:1px solid var(--line);
    border-radius:var(--r-card); box-shadow:var(--sh-card); padding:22px;
  }
  .toc-card h3{font-size:15px; color:var(--ink-mute); font-weight:600; letter-spacing:.04em; margin-bottom:12px}
  .toc-card a{
    display:flex; align-items:center; justify-content:space-between; gap:10px;
    padding:10px 12px; border-radius:10px; font-size:14.5px; color:var(--ink-soft);
    transition:background-color .18s, color .18s, padding-left .18s;
  }
  .toc-card a:hover{background:var(--brand-50); color:var(--brand-700); padding-left:16px}
  .toc-card a span.num{font-size:12px; color:var(--ink-mute); font-weight:600}
  .toc-note{margin-top:16px; padding-top:16px; border-top:1px dashed var(--line); font-size:13px; color:var(--ink-mute); line-height:1.7}

  .faq-group{margin-bottom:44px; scroll-margin-top:120px}
  .faq-group-head{display:flex; align-items:center; gap:12px; margin-bottom:18px}
  .faq-group-head h2{font-size:22px}
  .faq-group-head .badge{flex:none}
  .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:#CFE7F8}
  .faq-item[open]{border-color:#BFDCF3; box-shadow:var(--sh-card)}
  .faq-item summary{
    list-style:none; cursor:pointer; padding:17px 52px 17px 22px; position:relative;
    font-size:17px; font-weight:600; color:var(--ink); transition:color .18s;
  }
  .faq-item summary::-webkit-details-marker{display:none}
  .faq-item summary:hover{color:var(--brand-700)}
  .faq-item summary::after{
    content:""; position:absolute; right:20px; top:22px; width:10px; height:10px;
    border-right:2px solid var(--brand-600); border-bottom:2px solid var(--brand-600);
    transform:rotate(45deg); transition:transform .22s ease; border-radius:1px;
  }
  .faq-item[open] summary::after{transform:rotate(-135deg)}
  .faq-body{
    margin:0 22px 20px 22px; padding:14px 0 0 16px; border-left:3px solid var(--brand-500);
    font-size:15px; line-height:1.85; color:var(--ink-soft);
  }
  .faq-body p:last-child{margin-bottom:0}
  .faq-body ul{margin:8px 0 0; padding-left:0}
  .faq-body li{position:relative; padding-left:18px; margin-bottom:6px}
  .faq-body li::before{content:""; position:absolute; left:2px; top:12px; width:6px; height:6px; border-radius:2px; background:var(--brand-500)}

  /* ---------- Timeline ---------- */
  .timeline{max-width:860px; margin:0 auto}
  .tl-item{position:relative; margin-left:19px; padding:0 0 34px 44px; border-left:1px solid var(--brand-100)}
  .tl-item:last-child{border-left-color:transparent; padding-bottom:0}
  .tl-dot{
    position:absolute; left:-20px; top:-2px; width:40px; height:40px; border-radius:50%;
    background:#fff; border:1px solid var(--brand-100); color:var(--brand-600);
    display:flex; align-items:center; justify-content:center; font-size:14px; font-weight:700;
    box-shadow:0 8px 20px -14px rgba(15,111,184,.8);
  }
  .tl-item h3{font-size:18px; margin-bottom:6px}
  .tl-item p{color:var(--ink-soft); margin:0; font-size:15px}
  .tl-item .badge{margin-top:10px}

  /* ---------- Support block ---------- */
  .support-grid{display:grid; grid-template-columns:.95fr 1.05fr; gap:44px; align-items:center}
  .support-figure{
    border-radius:var(--r-card); overflow:hidden; border:1px solid var(--line);
    background:var(--brand-50); box-shadow:var(--sh-card);
  }
  .support-figure img{width:100%; aspect-ratio:16/11; object-fit:cover}
  .support-list{border-top:1px solid var(--line)}
  .support-list li{display:flex; gap:14px; padding:18px 0; border-bottom:1px solid var(--line)}
  .support-list .icon{color:var(--brand-600); margin-top:3px}
  .support-list b{display:block; font-size:16px; font-weight:600; margin-bottom:4px}
  .support-list span{display:block; font-size:14.5px; color:var(--ink-soft)}

  /* ---------- CTA band ---------- */
  .cta-band{
    background:linear-gradient(120deg,var(--brand-50) 0%,#ffffff 62%);
    border:1px solid var(--line); border-radius:20px; padding:56px 48px;
    box-shadow:var(--sh-card);
  }
  .cta-inner{display:flex; align-items:center; justify-content:space-between; gap:32px; flex-wrap:wrap}
  .cta-inner h2{font-size:28px; max-width:560px}
  .cta-inner p{color:var(--ink-soft); margin:10px 0 0; font-size:15.5px; max-width:560px}
  .cta-actions{display:flex; gap:12px; flex-wrap:wrap}

  /* ---------- Footer ---------- */
  .site-footer{background:var(--brand-900); color:rgba(255,255,255,.72); padding:72px 0 28px; margin-top:96px}
  .footer-grid{display:grid; grid-template-columns:1.5fr 1fr 1fr 1fr; gap:40px}
  .footer-brand{display:flex; align-items:center; gap:12px; color:#fff; font-size:18px; font-weight:700; margin-bottom:16px}
  .footer-brand .logo-mark{background:rgba(255,255,255,.14); box-shadow:none}
  .footer-desc{font-size:14px; line-height:1.8; color:rgba(255,255,255,.66); max-width:340px}
  .footer-col h3{font-size:15px; color:#fff; margin-bottom:16px; font-weight:600}
  .footer-col ul li{margin-bottom:10px}
  .footer-col a{font-size:14px; color:rgba(255,255,255,.7)}
  .footer-col a:hover{color:#fff; text-decoration:underline; text-underline-offset:4px}
  .footer-bottom{
    margin-top:48px; padding-top:22px; border-top:1px solid rgba(255,255,255,.14);
    display:flex; align-items:center; justify-content:space-between; gap:16px; flex-wrap:wrap;
    font-size:13px; color:rgba(255,255,255,.55);
  }
  .footer-bottom a{color:rgba(255,255,255,.7)}
  .footer-bottom a:hover{color:#fff}

  /* ---------- Responsive ---------- */
  @media (max-width:1280px){
    .help-split{grid-template-columns:270px minmax(0,1fr); gap:32px}
  }
  @media (max-width:1024px){
    h1{font-size:34px}
    h2{font-size:26px}
    .section{padding:72px 0}
    .section--tight{padding:56px 0}
    .nav-toggle{display:inline-flex}
    .nav-search{display:none}
    .nav-links{
      position:fixed; top:0; right:0; height:100vh; width:min(340px,88vw);
      background:#fff; border-radius:16px 0 0 16px; padding:96px 24px 28px;
      flex-direction:column; align-items:stretch; gap:2px; margin-left:0;
      transform:translateX(105%); transition:transform .26s ease;
      box-shadow:-24px 0 50px -26px rgba(7,46,79,.45); overflow-y:auto; z-index:68;
    }
    .nav-links.is-open{transform:translateX(0)}
    .nav-links a{font-size:17px; padding:14px 8px; border-bottom:1px solid var(--line); border-radius:0}
    .nav-links a:hover{background:transparent}
    .nav-links a.active::after{left:8px; right:auto; width:26px; bottom:6px}
    .hero-help{padding:calc(var(--nav-h) + 40px) 0 56px}
    .hero-grid{grid-template-columns:1fr; gap:36px}
    .hero-visual .frame img{aspect-ratio:16/9}
    .float-card{position:static; margin-top:14px; display:inline-block}
    .help-split{grid-template-columns:1fr; gap:28px}
    .toc-card{position:static}
    .support-grid{grid-template-columns:1fr; gap:28px}
    .footer-grid{grid-template-columns:1fr 1fr; gap:32px}
  }
  @media (max-width:768px){
    .container-x{padding:0 18px}
    h1{font-size:29px; line-height:1.32}
    h2{font-size:23px}
    h3{font-size:18px}
    .section{padding:56px 0}
    .section--tight{padding:44px 0}
    .entry-grid{grid-template-columns:1fr 1fr; gap:10px}
    .cta-band{padding:34px 24px}
    .cta-inner h2{font-size:23px}
    .footer-grid{grid-template-columns:1fr; gap:28px}
    .footer-bottom{flex-direction:column; align-items:flex-start}
    .faq-body{margin:0 16px 18px 16px}
    .faq-item summary{padding:15px 46px 15px 18px; font-size:16px}
    .faq-item summary::after{right:18px; top:20px}
  }
  @media (max-width:520px){
    .entry-grid{grid-template-columns:1fr}
    .hero-grid{gap:28px}
    .search-box{flex-direction:column; align-items:stretch; padding:12px; gap:10px}
    .search-box input{height:40px}
    .cta-actions{width:100%}
    .cta-actions .btn{width:100%}
    .logo-sub{display:none}
    .logo-text{font-size:16px}
  }

/* roulang page: category4 */
:root{
  --brand-50:#EFF7FD;
  --brand-100:#DCEEFB;
  --brand-500:#1C86D1;
  --brand-600:#0F6FB8;
  --brand-700:#0B5490;
  --brand-900:#072E4F;
  --accent:#FF7A3D;
  --accent-hover:#EA6428;
  --mint:#12B5A6;
  --ink:#0B1F33;
  --ink-2:#4A6076;
  --ink-3:#8A9BAE;
  --line:#E3EBF3;
  --page:#F5F9FD;
  --card:#FFFFFF;
  --r-card:16px;
  --r-btn:12px;
  --r-img:12px;
  --r-badge:8px;
  --shadow-card:0 1px 2px rgba(7,46,79,.06), 0 12px 32px -12px rgba(7,46,79,.16);
  --shadow-hover:0 2px 4px rgba(7,46,79,.08), 0 20px 44px -16px rgba(7,46,79,.24);
  --nav-h:88px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--ink);
  background:var(--page);
  font-variant-numeric:tabular-nums;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%;height:auto}
h1,h2,h3,h4{margin:0;font-weight:600;line-height:1.25;color:var(--ink)}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:var(--brand-600);text-decoration:none;transition:color .18s ease}
a:hover{text-decoration:underline;text-underline-offset:4px}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
:focus-visible{outline:2px solid var(--brand-500);outline-offset:2px;border-radius:8px}
.container-x{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}
.icon{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round;flex:none}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:14px 26px;border-radius:var(--r-btn);border:1px solid transparent;
  font-size:15px;font-weight:600;line-height:1;white-space:nowrap;
  transition:transform .18s ease,background-color .18s ease,box-shadow .18s ease,color .18s ease,border-color .18s ease;
}
.btn--primary{background:var(--accent);color:#fff;box-shadow:0 10px 24px -14px rgba(255,122,61,.9)}
.btn--primary:hover{background:var(--accent-hover);color:#fff;text-decoration:none;transform:translateY(-2px)}
.btn--primary:active{transform:translateY(0);box-shadow:0 6px 16px -12px rgba(255,122,61,.9)}
.btn--ghost{background:#fff;color:var(--brand-700);border-color:var(--line)}
.btn--ghost:hover{background:var(--brand-50);border-color:var(--brand-100);text-decoration:none;transform:translateY(-2px)}
.btn--ghost:active{transform:translateY(0)}
.btn--pill{border-radius:999px}
.btn--sm{padding:10px 18px;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 .icon{width:16px;height:16px;transition:transform .18s ease}
.link-arrow:hover{text-decoration:none;color:var(--brand-700)}
.link-arrow:hover .icon{transform:translateX(3px)}

/* ============ 徽章 / 标签 ============ */
.badge{display:inline-flex;align-items:center;gap:6px;padding:5px 10px;border-radius:var(--r-badge);font-size:13px;font-weight:600;line-height:1.4}
.badge--brand{background:var(--brand-50);color:var(--brand-700)}
.badge--mint{background:rgba(18,181,166,.13);color:#0C857A}
.badge--info{background:var(--page);color:var(--ink-2);border:1px solid var(--line)}

/* ============ 导航 ============ */
.site-header{
  position:fixed;top:0;left:0;right:0;height:var(--nav-h);z-index:70;
  display:flex;align-items:center;
  background:rgba(255,255,255,.62);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid rgba(255,255,255,.6);
  box-shadow:0 10px 28px -22px rgba(7,46,79,.55);
  transition:height .2s ease,background-color .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.site-header.is-scrolled{height:68px;background:rgba(255,255,255,.95);border-bottom-color:var(--line);box-shadow:0 10px 30px -20px rgba(7,46,79,.5)}
.nav-inner{display:flex;align-items:center;gap:20px;width:100%}
.logo{display:flex;align-items:center;gap:12px;flex:none}
.logo:hover{text-decoration:none}
.logo-mark{
  width:38px;height:38px;border-radius:11px;flex:none;
  display:inline-flex;align-items:center;justify-content:center;
  background:var(--brand-600);color:#fff;font-size:18px;font-weight:700;
}
.logo-text{display:block;font-size:17px;font-weight:700;color:var(--ink);line-height:1.2;letter-spacing:.01em}
.logo-sub{display:block;font-size:10px;font-weight:600;letter-spacing:.16em;color:var(--ink-3);line-height:1.6}
.nav-links{display:flex;align-items:center;gap:2px;margin-left:8px}
.nav-links a{position:relative;padding:10px 12px;border-radius:10px;font-size:15px;font-weight:500;color:var(--ink-2)}
.nav-links a:hover{color:var(--brand-700);background:var(--brand-50);text-decoration:none}
.nav-links a.active{color:var(--brand-700);font-weight:600}
.nav-links a.active::after{content:"";position:absolute;left:12px;right:12px;bottom:3px;height:2px;border-radius:2px;background:var(--brand-500)}
.nav-links__cta{display:none}
.nav-right{margin-left:auto;display:flex;align-items:center;gap:12px}
.nav-search{
  display:inline-flex;align-items:center;gap:8px;
  padding:0 16px;height:42px;border-radius:999px;
  background:#fff;border:1px solid var(--line);color:var(--ink-2);font-size:14px;
  transition:border-color .18s,color .18s,background-color .18s,box-shadow .18s;
}
.nav-search:hover{border-color:var(--brand-500);color:var(--brand-700);background:var(--brand-50);text-decoration:none}
.nav-toggle{display:none;width:44px;height:44px;border-radius:12px;border:1px solid var(--line);background:#fff;align-items:center;justify-content:center;transition:border-color .18s,background-color .18s}
.nav-toggle:hover{border-color:var(--brand-500);background:var(--brand-50)}
.nav-toggle span{position:relative;display:block;width:18px;height:2px;border-radius:2px;background:var(--ink);transition:background-color .2s}
.nav-toggle span::before,.nav-toggle span::after{content:"";position:absolute;left:0;width:18px;height:2px;border-radius:2px;background:var(--ink);transition:transform .2s}
.nav-toggle span::before{top:-6px}
.nav-toggle span::after{top:6px}
.nav-toggle.is-open span{background:transparent}
.nav-toggle.is-open span::before{transform:translateY(6px) rotate(45deg)}
.nav-toggle.is-open span::after{transform:translateY(-6px) rotate(-45deg)}
.nav-mask{position:fixed;inset:0;z-index:65;background:rgba(7,46,79,.42);opacity:0;pointer-events:none;transition:opacity .2s ease}
.nav-mask.is-open{opacity:1;pointer-events:auto}
body.is-locked{overflow:hidden}

/* ============ 内页 Hero ============ */
.page-hero{position:relative;overflow:hidden;background:#fff;padding:calc(var(--nav-h) + 56px) 0 72px}
.page-hero__bg{position:absolute;inset:0;background:url('/assets/images/backpic/back-2.png') center/cover no-repeat}
.page-hero__bg::after{content:"";position:absolute;inset:0;background:linear-gradient(104deg,rgba(255,255,255,.97) 0%,rgba(255,255,255,.9) 46%,rgba(239,247,253,.7) 100%)}
.page-hero__inner{position:relative;z-index:2;max-width:840px}
.crumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--ink-3);margin-bottom:22px}
.crumb a{color:var(--brand-600);font-weight:500}
.crumb em{font-style:normal;color:var(--ink-3)}
.page-hero h1{font-size:clamp(30px,4vw,50px);font-weight:700;letter-spacing:-.01em;margin:16px 0 18px;line-height:1.18}
.page-hero__lead{font-size:17px;line-height:1.85;color:var(--ink-2);max-width:700px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
.hero-meta{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:38px;max-width:720px}
.hero-meta li{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px 18px;box-shadow:0 1px 2px rgba(7,46,79,.05)}
.hero-meta strong{display:block;font-size:24px;font-weight:600;color:var(--brand-700);line-height:1.3}
.hero-meta span{display:block;font-size:13px;color:var(--ink-3);margin-top:4px}

/* ============ 通用板块 ============ */
.section{padding:96px 0}
.section--alt{background:#fff}
.section--tight{padding:72px 0}
.section-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:36px}
.section-head h2{font-size:clamp(26px,3vw,34px)}
.section-head p{margin-top:12px;color:var(--ink-2);max-width:660px;font-size:15.5px;line-height:1.85}
.kicker{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--brand-600);letter-spacing:.04em}
.kicker::before{content:"";width:6px;height:6px;border-radius:2px;background:var(--accent)}

/* ============ 图文列表流 ============ */
.feed{display:flex;flex-direction:column;gap:22px}
.feed-item{
  display:grid;grid-template-columns:320px minmax(0,1fr);gap:28px;align-items:center;
  background:var(--card);border:1px solid var(--line);border-radius:var(--r-card);
  padding:20px;box-shadow:var(--shadow-card);
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.feed-item:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover);border-color:var(--brand-100)}
.ratio{position:relative;display:block;overflow:hidden;border-radius:var(--r-img);background:var(--brand-100)}
.ratio img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .35s ease}
.ratio:hover img{transform:scale(1.04)}
.ratio-16x10{padding-top:62.5%}
.ratio-16x9{padding-top:56.25%}
.feed-item__body{min-width:0}
.feed-item__tags{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px}
.feed-item__body h3{font-size:21px;line-height:1.45;margin-bottom:12px}
.feed-item__body h3 a{color:var(--ink)}
.feed-item__body h3 a:hover{color:var(--brand-700);text-decoration:none}
.feed-item__body p{font-size:15px;line-height:1.85;color:var(--ink-2)}
.feed-item__meta{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-top:18px;font-size:13.5px;color:var(--ink-3)}
.feed-item__meta .dot{width:4px;height:4px;border-radius:50%;background:var(--line)}
.feed-item__meta .link-arrow{margin-left:auto}

/* ============ 关注排行（深色块） ============ */
.rank-band{background:var(--brand-900);border-radius:24px;padding:52px 44px;color:#fff}
.rank-band h2{color:#fff;font-size:clamp(24px,3vw,32px)}
.rank-band .kicker{color:#7FC4EC}
.rank-band .kicker::before{background:var(--accent)}
.rank-band__desc{margin-top:12px;color:#9DB6CA;font-size:15px;max-width:640px;line-height:1.85}
.rank-list{margin-top:34px;display:flex;flex-direction:column;gap:8px}
.rank-item{display:grid;grid-template-columns:34px minmax(0,1fr) 130px;align-items:center;gap:18px;padding:16px 4px;border-top:1px solid rgba(255,255,255,.1)}
.rank-item:first-child{border-top:1px solid rgba(255,255,255,.1)}
.rank-num{font-size:16px;font-weight:700;color:#5FA6D6}
.rank-item:nth-child(1) .rank-num{color:var(--accent)}
.rank-title{color:#E6F1F9;font-size:16px;font-weight:500}
.rank-title:hover{color:#fff;text-decoration:none}
.rank-bar{height:6px;border-radius:6px;background:rgba(255,255,255,.14);overflow:hidden}
.rank-bar i{display:block;height:100%;border-radius:6px;background:linear-gradient(90deg,var(--mint),var(--brand-500))}
.rank-score{display:block;text-align:right;font-size:13px;color:#9DB6CA;margin-top:8px}

/* ============ 标签云 ============ */
.tag-block{margin-top:44px;padding-top:34px;border-top:1px solid var(--line)}
.tag-block h3{font-size:18px;margin-bottom:18px}
.tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
.tag{display:inline-flex;align-items:center;padding:8px 15px;border-radius:999px;background:var(--brand-50);color:var(--brand-700);font-size:14px;font-weight:500;transition:background-color .18s,transform .18s,color .18s}
.tag:hover{background:var(--brand-100);color:var(--brand-700);text-decoration:none;transform:translateY(-1px)}
.tag--mint{background:rgba(18,181,166,.12);color:#0C857A}
.tag--mint:hover{background:rgba(18,181,166,.2);color:#0C857A}

/* ============ 分页 ============ */
.pager{display:flex;justify-content:center;align-items:center;flex-wrap:wrap;gap:8px;margin-top:44px}
.pager a{min-width:44px;height:44px;padding:0 14px;display:inline-flex;align-items:center;justify-content:center;border-radius:12px;border:1px solid var(--line);background:#fff;color:var(--ink-2);font-size:14px;font-weight:600;transition:border-color .18s,color .18s,background-color .18s,transform .18s}
.pager a:hover{border-color:var(--brand-500);color:var(--brand-700);background:var(--brand-50);text-decoration:none;transform:translateY(-1px)}
.pager a.is-active{background:var(--brand-600);border-color:var(--brand-600);color:#fff}
.pager a.is-active:hover{background:var(--brand-700);border-color:var(--brand-700);color:#fff}
.pager a.is-disabled{opacity:.45;pointer-events:none}

/* ============ FAQ ============ */
.faq{max-width:880px;margin:0 auto;display:flex;flex-direction:column;gap:14px}
.faq details{position:relative;background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px 24px;transition:border-color .2s,box-shadow .2s}
.faq details:hover{border-color:var(--brand-100)}
.faq details[open]{border-color:var(--brand-100);box-shadow:var(--shadow-card)}
.faq details[open]::before{content:"";position:absolute;left:0;top:22px;bottom:22px;width:3px;border-radius:3px;background:var(--brand-500)}
.faq summary{display:flex;align-items:center;justify-content:space-between;gap:16px;list-style:none;cursor:pointer;font-size:17px;font-weight:600;color:var(--ink)}
.faq summary::-webkit-details-marker{display:none}
.faq summary .chev{width:18px;height:18px;color:var(--ink-3);transition:transform .2s ease,color .2s ease}
.faq details[open] summary .chev{transform:rotate(90deg);color:var(--brand-600)}
.faq p{margin-top:12px;font-size:15px;line-height:1.8;color:var(--ink-2)}

/* ============ CTA ============ */
.cta-band{
  display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:32px;
  background:var(--brand-50);border:1px solid var(--brand-100);border-radius:24px;padding:46px;
}
.cta-band h2{font-size:clamp(24px,3vw,32px)}
.cta-band p{margin-top:12px;color:var(--ink-2);font-size:15.5px;max-width:620px;line-height:1.85}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px}
.cta-note{margin-top:16px;font-size:13px;color:var(--ink-3)}

/* ============ 页脚 ============ */
.site-footer{margin-top:24px;background:var(--brand-900);color:#C8D8E6;padding:72px 0 28px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px}
.footer-brand{display:flex;align-items:center;gap:12px;color:#fff;font-size:18px;font-weight:600;margin-bottom:16px}
.footer-brand .logo-mark{background:var(--brand-500)}
.footer-desc{font-size:14px;line-height:1.85;color:#9DB6CA;max-width:340px}
.footer-col h3{font-size:15px;font-weight:600;color:#fff;margin-bottom:16px}
.footer-col li{margin-bottom:10px}
.footer-col a{font-size:14px;color:#9DB6CA}
.footer-col a:hover{color:#fff;text-decoration:none}
.footer-bottom{margin-top:48px;padding-top:22px;border-top:1px solid rgba(255,255,255,.12);display:flex;flex-wrap:wrap;justify-content:space-between;gap:14px;font-size:13px;color:#7E97AB}
.footer-bottom a{color:#7E97AB}
.footer-bottom a:hover{color:#fff;text-decoration:none}

/* ============ 响应式 ============ */
@media (max-width:1023px){
  .nav-links{
    position:absolute;top:calc(100% + 12px);right:20px;
    width:min(320px,calc(100vw - 40px));
    display:flex;flex-direction:column;align-items:stretch;gap:4px;margin-left:0;
    background:#fff;border:1px solid var(--line);border-radius:16px;
    box-shadow:var(--shadow-hover);padding:12px;
    opacity:0;visibility:hidden;transform:translateY(-8px);pointer-events:none;
    transition:opacity .2s ease,transform .2s ease,visibility .2s ease;
  }
  .nav-links.is-open{opacity:1;visibility:visible;transform:none;pointer-events:auto}
  .nav-links a{font-size:17px;padding:12px 14px;border-radius:12px}
  .nav-links a.active{background:var(--brand-50)}
  .nav-links a.active::after{display:none}
  .nav-links__cta{display:inline-flex;margin-top:8px;width:100%}
  .nav-search{display:none}
  .nav-toggle{display:inline-flex}
  .section{padding:72px 0}
  .section--tight{padding:60px 0}
  .feed-item{grid-template-columns:260px minmax(0,1fr);gap:22px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .rank-band{padding:40px 32px}
  .cta-band{grid-template-columns:1fr;padding:36px}
}
@media (max-width:767px){
  :root{--nav-h:72px}
  .container-x{padding:0 18px}
  .logo-text{font-size:15.5px}
  .logo-sub{display:none}
  .btn{padding:13px 22px}
  .page-hero{padding:calc(var(--nav-h) + 36px) 0 52px}
  .page-hero__lead{font-size:15.5px}
  .hero-actions .btn{flex:1 1 100%}
  .hero-meta{grid-template-columns:1fr 1fr;gap:12px}
  .hero-meta li{padding:14px}
  .hero-meta strong{font-size:20px}
  .section{padding:56px 0}
  .section--tight{padding:48px 0}
  .feed-item{grid-template-columns:1fr;gap:18px;padding:16px}
  .feed-item__body h3{font-size:19px}
  .feed-item__meta .link-arrow{margin-left:0}
  .rank-band{padding:32px 22px;border-radius:18px}
  .rank-item{grid-template-columns:26px minmax(0,1fr);gap:12px;row-gap:6px}
  .rank-bar{grid-column:2}
  .rank-score{grid-column:2;text-align:left;margin-top:0}
  .faq details{padding:16px 18px}
  .faq summary{font-size:16px}
  .cta-band{padding:28px 22px;border-radius:18px}
  .cta-actions .btn{flex:1 1 100%}
  .footer-grid{grid-template-columns:1fr;gap:30px}
  .footer-bottom{flex-direction:column;gap:8px}
  .pager a{min-width:40px;height:40px;font-size:13px}
}
@media (max-width:520px){
  .hero-meta{grid-template-columns:1fr}
  .feed-item__tags .badge{font-size:12px}
}