/* roulang page: index */
:root{
  --brand:#1D5B79;
  --brand-deep:#14415A;
  --brand-light:#2A7A9B;
  --brand-soft:#E8F1F5;
  --amber:#D9963F;
  --amber-soft:#FBF1E1;
  --amber-text:#8A5A18;
  --teal:#4FA3A5;
  --ink:#1E2A32;
  --text:#3D4C56;
  --muted:#6C7E88;
  --line:#E2E9ED;
  --bg:#F6F9FA;
  --card:#FFFFFF;
  --dark:#0E2A38;
  --r-card:16px;
  --r-img:12px;
  --r-btn:10px;
  --sh-card:0 6px 20px rgba(14,42,56,.07);
  --sh-hover:0 14px 40px rgba(14,42,56,.10);
  --sh-float:0 10px 28px rgba(29,91,121,.32);
  --ring:0 0 0 3px rgba(42,122,155,.28);
  --s1:4px;--s2:8px;--s3:12px;--s4:16px;--s5:24px;--s6:32px;--s7:48px;--s8:64px;--s9:96px;
}
*,*::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","Noto Sans SC",system-ui,sans-serif;font-size:16px;line-height:1.85;color:var(--text);background:var(--bg);letter-spacing:0}
h1,h2,h3,h4,p,figure{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;border:0;background:none;cursor:pointer}
input,textarea{font:inherit;color:inherit}
:focus-visible{outline:none;box-shadow:var(--ring);border-radius:6px}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}
.section{padding:96px 0}
.section-sm{padding:64px 0}
.h1{font-size:clamp(30px,4vw,46px);line-height:1.22;font-weight:700;color:var(--ink)}
.h2{font-size:clamp(24px,3vw,34px);line-height:1.3;font-weight:600;color:var(--ink)}
.h3{font-size:clamp(17px,1.5vw,22px);line-height:1.45;font-weight:600;color:var(--ink)}
.lead{font-size:17px;line-height:1.9;color:var(--text)}
.small{font-size:14px;line-height:1.7;color:var(--muted)}
.tiny{font-size:13px;line-height:1.6;color:var(--muted)}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--brand);margin-bottom:12px}
.eyebrow::before{content:"";width:4px;height:14px;border-radius:2px;background:var(--brand)}
.sec-head{max-width:680px}
.sec-head .h2{margin-bottom:12px}
.divider{height:1px;background:var(--line);border:0;margin:0}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;height:44px;padding:0 24px;border-radius:var(--r-btn);border:1px solid transparent;font-size:15px;font-weight:600;cursor:pointer;transition:background .16s ease-out,color .16s ease-out,border-color .16s ease-out,transform .16s ease-out,box-shadow .16s ease-out}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-deep);transform:translateY(-1px)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{background:#fff;color:var(--brand);border-color:#C9D7DE}
.btn-ghost:hover{border-color:var(--brand);background:#F2F7F9}
.btn-ghost:active{background:var(--brand-soft)}
.btn-sm{height:40px;min-height:40px;padding:0 18px;font-size:14px}
.btn[disabled]{opacity:.45;cursor:not-allowed}
.text-link{display:inline-flex;align-items:center;gap:6px;color:var(--brand);font-weight:600;font-size:14px;min-height:44px}
.text-link .arw{transition:transform .16s ease-out}
.text-link:hover .arw{transform:translateX(2px)}
.text-link:hover{color:var(--brand-deep)}

/* 徽章 */
.badge{display:inline-block;font-size:12px;line-height:1.6;padding:2px 10px;border-radius:999px;background:var(--brand-soft);color:var(--brand-deep)}
.badge-amber{background:var(--amber-soft);color:var(--amber-text)}
.dot-sep{display:inline-block;width:3px;height:3px;border-radius:50%;background:#C9D7DE;vertical-align:middle;margin:0 8px}

/* 导航 */
.site-header{position:sticky;top:0;z-index:100;background:#fff;border-bottom:1px solid var(--line);transition:box-shadow .2s ease-out}
.site-header.scrolled{box-shadow:0 1px 0 var(--line)}
.nav-grid{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;height:72px;gap:24px}
.nav-links{display:flex;align-items:center;gap:26px}
.nav-links.right{justify-content:flex-end}
.nav-link{position:relative;display:inline-flex;align-items:center;min-height:44px;padding:6px 2px;font-size:15px;color:var(--text);transition:color .22s ease-out}
.nav-link::after{content:"";position:absolute;left:50%;bottom:6px;width:0;height:2px;border-radius:2px;background:var(--brand);transform:translateX(-50%);transition:width .22s ease-out}
.nav-link:hover{color:var(--brand)}
.nav-link:hover::after{width:60%}
.nav-link.active{color:var(--brand);font-weight:600}
.nav-link.active::after{width:60%}
.brand{display:inline-flex;align-items:center;gap:10px;padding:6px 40px;justify-self:center}
.brand-mark{width:28px;height:28px;border-radius:8px;background:var(--brand);color:#fff;font-size:14px;font-weight:700;display:flex;align-items:center;justify-content:center;flex:0 0 auto}
.brand-text{font-size:18px;font-weight:600;color:var(--ink);transition:color .22s ease-out;white-space:nowrap}
.brand:hover .brand-text{color:var(--brand)}
.nav-burger{display:none;width:44px;height:44px;align-items:center;justify-content:center;border-radius:10px;border:1px solid var(--line);background:#fff}
.nav-burger span{display:block;width:20px;height:2px;background:var(--ink);border-radius:2px;position:relative;transition:transform .22s ease-out,background .22s ease-out}
.nav-burger span::before,.nav-burger span::after{content:"";position:absolute;left:0;width:20px;height:2px;background:var(--ink);border-radius:2px;transition:transform .22s ease-out}
.nav-burger span::before{top:-6px}
.nav-burger span::after{top:6px}
.nav-burger.is-open span{background:transparent}
.nav-burger.is-open span::before{transform:translateY(6px) rotate(45deg)}
.nav-burger.is-open span::after{transform:translateY(-6px) rotate(-45deg)}
.mobile-panel{display:none;position:fixed;left:0;right:0;top:60px;z-index:99;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 18px 40px rgba(14,42,56,.12);padding:8px 24px 24px}
.mobile-panel.is-open{display:block}
.mobile-panel a.m-link{display:flex;align-items:center;min-height:52px;font-size:16px;font-weight:500;color:var(--ink);border-bottom:1px solid var(--line)}
.mobile-panel a.m-link.active{color:var(--brand)}
.mobile-panel .btn{width:100%;margin-top:20px}
.nav-mask{position:fixed;inset:0;top:60px;background:rgba(14,42,56,.45);z-index:98;opacity:0;pointer-events:none;transition:opacity .2s ease-out}
.nav-mask.is-open{opacity:1;pointer-events:auto}

/* Hero */
.hero{position:relative;overflow:hidden;padding:80px 0 88px;background:var(--bg)}
.hero::before{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(29,91,121,.10) 1px,transparent 1px);background-size:22px 22px;opacity:.35;pointer-events:none}
.hero::after{content:"";position:absolute;right:-160px;top:-180px;width:520px;height:520px;border-radius:50%;background:rgba(29,91,121,.06);pointer-events:none}
.hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:1.08fr 1fr;gap:48px;align-items:center}
.hero-copy .h1{margin-bottom:20px}
.hero-copy .lead{max-width:560px;font-size:18px;line-height:1.85;color:var(--text)}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.hero-stats{display:flex;align-items:center;margin-top:40px}
.stat{padding:0 24px;border-left:1px solid var(--line)}
.stat:first-child{padding-left:0;border-left:0}
.stat b{display:block;font-size:22px;line-height:1.2;font-weight:700;color:var(--brand)}
.stat span{display:block;font-size:13px;color:var(--muted);margin-top:4px}
.hero-media{position:relative}
.hero-media img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:var(--r-card);box-shadow:0 14px 40px rgba(14,42,56,.18);background:var(--brand-soft)}
.hero-strip{position:absolute;left:28px;right:28px;bottom:-8px;height:8px;border-radius:0 0 8px 8px;background:var(--brand)}
.hero-float{position:absolute;left:-20px;bottom:24px;display:flex;align-items:center;gap:10px;background:#fff;border-radius:12px;padding:12px 16px;box-shadow:0 12px 30px rgba(14,42,56,.16)}
.hero-float .ic{width:34px;height:34px;border-radius:9px;background:var(--brand-soft);color:var(--brand);display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;flex:0 0 auto}
.hero-float b{display:block;font-size:13px;color:var(--ink);font-weight:600;line-height:1.5}
.hero-float span{display:block;font-size:12px;color:var(--muted);line-height:1.5}

/* 卖点 */
.selling-grid{display:grid;grid-template-columns:4fr 8fr;gap:48px;align-items:start}
.selling-side{position:sticky;top:104px}
.selling-side .h2{margin-bottom:12px}
.selling-side p{font-size:15px;line-height:1.85;color:var(--muted);max-width:300px;margin-bottom:16px}
.sell-list{border-top:1px solid var(--line)}
.sell-item{display:flex;gap:20px;padding:24px 20px;border-bottom:1px solid var(--line);border-radius:10px;transition:background .16s ease-out}
.sell-item:hover{background:#F2F7F9}
.sell-num{flex:0 0 48px;font-size:20px;font-weight:700;color:var(--brand);line-height:1.5}
.sell-body .h3{margin-bottom:6px}
.sell-body p{font-size:15px;line-height:1.8;color:var(--muted)}

/* 演示 */
.demo-head{max-width:640px;margin:0 auto 48px;text-align:center}
.demo-head .eyebrow{justify-content:center}
.demo-grid{display:grid;grid-template-columns:4fr 8fr;gap:40px;align-items:start}
.steps{display:flex;flex-direction:column;gap:12px}
.step{display:flex;gap:14px;padding:16px;border-radius:12px;background:#fff;border:1px solid var(--line);box-shadow:var(--sh-card);transition:box-shadow .16s ease-out,transform .16s ease-out}
.step:hover{box-shadow:var(--sh-hover);transform:translateY(-2px)}
.step-no{flex:0 0 28px;width:28px;height:28px;border-radius:50%;border:1px solid var(--brand);color:var(--brand);font-size:13px;font-weight:700;display:flex;align-items:center;justify-content:center}
.step b{display:block;font-size:16px;font-weight:600;color:var(--ink);line-height:1.5}
.step p{font-size:14px;line-height:1.7;color:var(--muted);margin-top:2px}
.demo-media img{width:100%;aspect-ratio:16/10;object-fit:cover;border-radius:var(--r-card);box-shadow:var(--sh-card);background:var(--brand-soft)}
.demo-cap{margin-top:12px;font-size:13px;color:var(--muted);text-align:center}

/* 证据 */
.evidence{background:var(--dark);padding:80px 0;color:#fff}
.evidence-grid{display:grid;grid-template-columns:5fr 7fr;gap:48px;align-items:start}
.evidence .h2{color:#fff;margin-bottom:16px}
.evidence p.ev-desc{font-size:15px;line-height:1.9;color:rgba(255,255,255,.72);max-width:360px}
.ev-cards{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.ev-card{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:var(--r-card);padding:24px}
.ev-card b{display:block;font-size:32px;line-height:1;font-weight:700;color:#fff}
.ev-card b em{font-style:normal;font-size:16px;font-weight:600;margin-left:4px}
.ev-card span{display:block;font-size:13px;line-height:1.7;color:rgba(255,255,255,.65);margin-top:10px}
.ev-note{margin-top:32px;font-size:13px;color:rgba(255,255,255,.5)}

/* 访问方案 */
.price-list{border-top:1px solid var(--line);margin-top:32px}
.price-row{position:relative;display:grid;grid-template-columns:1.1fr 1.5fr .8fr auto;gap:24px;align-items:center;padding:24px;border-bottom:1px solid var(--line);transition:background .16s ease-out}
.price-row:hover{background:#F6FAFB}
.price-row.recommend{background:#F2F7F9}
.price-row.recommend::before{content:"";position:absolute;left:0;top:14px;bottom:14px;width:4px;border-radius:0 4px 4px 0;background:var(--brand)}
.price-row .p-flag{position:absolute;right:24px;top:-1px;transform:translateY(-50%)}
.p-name b{display:block;font-size:17px;font-weight:600;color:var(--ink)}
.p-name span{display:block;font-size:13px;color:var(--muted);margin-top:2px}
.p-points{font-size:14px;line-height:1.8;color:var(--muted)}
.p-points i{font-style:normal;color:#C9D7DE;margin:0 8px}
.p-state b{display:block;font-size:24px;line-height:1.1;font-weight:700;color:var(--brand)}
.p-state span{display:block;font-size:13px;color:var(--muted);margin-top:4px}
.price-foot{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin-top:24px;font-size:14px;color:var(--muted)}

/* 最新信息 */
.news-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:32px;flex-wrap:wrap}
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.news-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r-card);box-shadow:var(--sh-card);overflow:hidden;transition:transform .22s ease-out,box-shadow .22s ease-out,border-color .22s ease-out}
.news-card:hover{transform:translateY(-4px);box-shadow:var(--sh-hover)}
.news-thumb{display:block;overflow:hidden;border-radius:var(--r-card) var(--r-card) 0 0;background:var(--bg)}
.news-thumb img{width:100%;aspect-ratio:16/9;object-fit:cover;transition:transform .22s ease-out}
.news-card:hover .news-thumb img{transform:scale(1.03)}
.news-body{padding:24px}
.news-body .badge{margin-bottom:12px}
.news-body h3{font-size:17px;font-weight:600;line-height:1.5;color:var(--ink);margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;transition:color .16s ease-out}
.news-card:hover .news-body h3{color:var(--brand)}
.news-body p{font-size:14px;line-height:1.75;color:var(--muted);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;min-height:73px}
.news-foot{display:flex;align-items:center;gap:8px;margin-top:16px;padding-top:16px;border-top:1px solid var(--line)}
.news-foot time{font-size:13px;color:var(--muted)}
.news-foot .more{margin-left:auto;font-size:13px;font-weight:600;color:var(--brand);min-height:44px;display:inline-flex;align-items:center}
.news-foot .more:hover{color:var(--brand-deep)}
.empty{min-height:240px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;text-align:center;background:#fff;border:1px dashed #C9D7DE;border-radius:var(--r-card);padding:32px}
.empty svg{width:48px;height:48px;stroke:#C9D7DE}
.empty p{font-size:15px;color:var(--muted)}

/* FAQ */
.faq-grid{display:grid;grid-template-columns:4fr 8fr;gap:48px;align-items:start}
.faq-side{position:sticky;top:104px}
.faq-side .h2{margin-bottom:12px}
.faq-side p{font-size:15px;line-height:1.85;color:var(--muted);max-width:300px;margin-bottom:12px}
.faq-list{display:flex;flex-direction:column;gap:10px}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:12px;padding:0 20px;transition:border-color .16s ease-out,background .16s ease-out}
.faq-item.open{border:1.5px solid rgba(29,91,121,.4);background:#FBFDFE}
.faq-q{display:flex;align-items:center;justify-content:space-between;gap:16px;width:100%;text-align:left;padding:18px 0;font-size:16px;font-weight:600;color:var(--ink);min-height:44px}
.faq-q:hover{color:var(--brand)}
.faq-icon{flex:0 0 auto;color:var(--brand);font-size:20px;line-height:1;transition:transform .22s ease-out}
.faq-item.open .faq-icon{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .22s ease-out}
.faq-item.open .faq-a{max-height:360px}
.faq-a p{padding:0 0 18px;font-size:15px;line-height:1.8;color:var(--text);border-top:1px solid var(--line);padding-top:12px}

/* 联系 */
.contact-card{background:#EDF4F7;border-radius:24px;padding:56px 40px}
.contact-top{max-width:640px;margin:0 auto 32px;text-align:center}
.contact-top .h2{margin-bottom:12px}
.contact-top p{font-size:15px;line-height:1.85;color:var(--muted)}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px 20px;max-width:720px;margin:0 auto}
.field{display:flex;flex-direction:column}
.field.full{grid-column:1 / -1}
.field label{font-size:14px;font-weight:500;color:var(--ink);margin-bottom:6px}
.field input,.field textarea{height:44px;padding:0 14px;border:1px solid #C9D7DE;border-radius:var(--r-btn);background:#fff;font-size:15px;color:var(--ink);transition:border-color .16s ease-out,box-shadow .16s ease-out}
.field textarea{height:auto;min-height:104px;padding:12px 14px;line-height:1.7;resize:vertical}
.field input::placeholder,.field textarea::placeholder{color:#9AABB3}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--brand);box-shadow:var(--ring)}
.form-actions{grid-column:1 / -1;display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.form-tip{font-size:13px;color:var(--muted)}
.form-msg{grid-column:1 / -1;font-size:14px;color:var(--brand);display:none}
.form-msg.show{display:block}

/* 浮动 CTA */
.float-cta{position:fixed;right:28px;bottom:28px;z-index:90;display:inline-flex;align-items:center;gap:8px;height:48px;padding:0 22px;border-radius:999px;background:var(--brand);color:#fff;font-size:15px;font-weight:600;box-shadow:var(--sh-float);opacity:1;transform:translateY(0);transition:opacity .2s ease-out,transform .2s ease-out,background .16s ease-out}
.float-cta:hover{background:var(--brand-deep);transform:translateY(-2px)}
.float-cta:active{transform:translateY(0)}
.float-cta .arw{transition:transform .16s ease-out}
.float-cta:hover .arw{transform:translateX(2px)}
.float-cta.is-hidden{opacity:0;transform:translateY(14px);pointer-events:none}

/* 页脚 */
.site-footer{background:var(--dark);padding:64px 0 32px;color:rgba(255,255,255,.72)}
.footer-grid{display:grid;grid-template-columns:4fr 2fr 3fr 3fr;gap:40px}
.f-brand{display:inline-flex;align-items:center;gap:10px;margin-bottom:16px}
.f-brand .brand-mark{background:#fff;color:var(--brand-deep)}
.f-brand .brand-text{color:#fff;font-size:17px}
.footer-grid p{font-size:14px;line-height:1.8;color:rgba(255,255,255,.72);max-width:280px}
.footer-grid .f-contact{margin-top:12px;font-size:14px;color:rgba(255,255,255,.6)}
.f-title{font-size:15px;font-weight:600;color:#fff;margin-bottom:16px}
.f-links{display:flex;flex-direction:column;gap:10px}
.f-links a{font-size:14px;color:rgba(255,255,255,.72);transition:color .16s ease-out;display:inline-flex;min-height:32px;align-items:center}
.f-links a:hover{color:#fff;text-decoration:underline;text-underline-offset:4px}
.f-tags{display:flex;flex-wrap:wrap;gap:8px}
.f-tags span{font-size:12px;padding:4px 12px;border-radius:999px;background:rgba(255,255,255,.08);color:rgba(255,255,255,.78)}
.footer-grid .f-note{font-size:13px;line-height:1.8;color:rgba(255,255,255,.55)}
.footer-bottom{margin-top:48px;padding-top:24px;border-top:1px solid rgba(255,255,255,.12);display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;font-size:13px;color:rgba(255,255,255,.55)}

/* 响应式 */
@media (max-width:1279px){
  .nav-links{gap:18px}
  .brand{padding:6px 24px}
  .container{padding:0 24px}
}
@media (max-width:1023px){
  .section{padding:72px 0}
  .site-header{height:60px}
  .nav-grid{height:60px;grid-template-columns:1fr auto 1fr;gap:12px}
  .nav-links{display:none}
  .brand{justify-self:start;padding:6px 0}
  .nav-burger{display:flex;justify-self:end}
  .hero{padding:56px 0 64px}
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .hero-media{max-width:560px}
  .hero-float{left:12px;bottom:16px}
  .selling-grid,.demo-grid,.evidence-grid,.faq-grid{grid-template-columns:1fr;gap:32px}
  .selling-side,.faq-side{position:static}
  .selling-side p,.faq-side p{max-width:none}
  .price-row{grid-template-columns:1fr 1fr;gap:16px}
  .price-row .p-flag{right:0}
  .news-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:2fr 2fr;gap:32px}
  .contact-card{padding:40px 24px}
}
@media (max-width:767px){
  .section{padding:56px 0}
  .container{padding:0 18px}
  .mobile-panel{top:60px}
  .hero-actions{gap:10px}
  .hero-actions .btn{flex:1 1 auto}
  .hero-stats{flex-wrap:wrap;gap:16px 0}
  .stat{padding:0 16px}
  .stat:nth-child(3){padding-left:0;border-left:0}
  .ev-cards{grid-template-columns:1fr}
  .price-row{grid-template-columns:1fr;gap:12px;padding:20px 16px}
  .price-row .btn{width:100%}
  .news-grid{grid-template-columns:1fr}
  .form-grid{grid-template-columns:1fr}
  .float-cta{left:0;right:0;bottom:0;height:56px;border-radius:0;justify-content:center;padding:0 18px calc(0px + env(safe-area-inset-bottom))}
  .float-cta:hover{transform:none}
  body{padding-bottom:72px}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-bottom{flex-direction:column;gap:8px}
}
@media (max-width:519px){
  .h1{font-size:28px}
  .hero-stats{gap:12px}
  .stat b{font-size:20px}
  .demo-head{text-align:left;margin-left:0;margin-right:0}
  .demo-head .eyebrow{justify-content:flex-start}
  .sell-item{padding:20px 12px;gap:14px}
  .contact-card{padding:32px 18px}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important;scroll-behavior:auto !important}
}

/* roulang page: article */
:root{
  --blue:#1D5B79;
  --blue-dark:#14415A;
  --blue-light:#2A7A9B;
  --blue-pale:#E8F1F5;
  --blue-soft:#F2F7F9;
  --amber:#D9963F;
  --amber-pale:#FBF1E1;
  --amber-text:#8A5A18;
  --teal:#4FA3A5;
  --ink:#1E2A32;
  --text:#3D4C56;
  --muted:#6C7E88;
  --line:#E2E9ED;
  --line-strong:#C9D7DE;
  --bg:#F6F9FA;
  --surface:#FFFFFF;
  --dark:#0E2A38;
  --r-card:16px;
  --r-img:12px;
  --r-btn:10px;
  --r-pill:999px;
  --r-block:24px;
  --sh-card:0 6px 20px rgba(14,42,56,.07);
  --sh-hover:0 14px 40px rgba(14,42,56,.10);
  --sh-float:0 10px 28px rgba(29,91,121,.32);
  --ring:0 0 0 3px rgba(42,122,155,.28);
  --ease:220ms ease-out;
  --fast:160ms ease-out;
}
*,*::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","Noto Sans SC",system-ui,sans-serif;
  font-size:16px;line-height:1.85;color:var(--text);background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
body.menu-open{overflow:hidden}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4{margin:0;color:var(--ink);letter-spacing:0}
p{margin:0}
:focus-visible{outline:none;box-shadow:var(--ring);border-radius:6px}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}

/* ---------- 导航 ---------- */
.site-header{position:sticky;top:0;z-index:100;background:#fff;border-bottom:1px solid var(--line);transition:box-shadow var(--ease)}
.site-header.scrolled{box-shadow:0 1px 0 var(--line),0 6px 18px rgba(14,42,56,.05)}
.nav-grid{position:relative;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;height:72px;gap:20px}
.nav-links{display:flex;align-items:center;gap:26px}
.nav-links.right{justify-content:flex-end;gap:20px}
.nav-link{position:relative;display:inline-flex;align-items:center;min-height:44px;font-size:15px;color:var(--text);transition:color var(--fast)}
.nav-link::after{content:"";position:absolute;left:50%;bottom:6px;width:60%;height:2px;border-radius:2px;background:var(--blue);transform:translateX(-50%) scaleX(0);transform-origin:center;transition:transform var(--ease)}
.nav-link:hover{color:var(--blue)}
.nav-link:hover::after,.nav-link.active::after{transform:translateX(-50%) scaleX(1)}
.nav-link.active{color:var(--blue)}
.brand{display:inline-flex;align-items:center;gap:10px;justify-self:center;padding:0 40px;min-height:44px;transition:opacity var(--fast)}
.brand-mark{width:28px;height:28px;border-radius:8px;background:var(--blue);color:#fff;font-size:15px;font-weight:700;display:inline-flex;align-items:center;justify-content:center;flex:0 0 auto}
.brand-text{font-size:18px;font-weight:600;color:var(--ink);transition:color var(--fast);white-space:nowrap}
.brand:hover .brand-text{color:var(--blue)}
.brand:active .brand-text{color:var(--blue-dark)}
.nav-burger{display:none;width:44px;height:44px;border:1px solid var(--line);border-radius:var(--r-btn);background:#fff;cursor:pointer;justify-self:end;align-items:center;justify-content:center;position:relative;transition:border-color var(--fast),background var(--fast)}
.nav-burger span{display:block;width:18px;height:2px;border-radius:2px;background:var(--ink);position:relative;transition:background var(--fast)}
.nav-burger span::before,.nav-burger span::after{content:"";position:absolute;left:0;width:18px;height:2px;border-radius:2px;background:var(--ink);transition:transform var(--ease),top var(--ease)}
.nav-burger span::before{top:-6px}
.nav-burger span::after{top:6px}
.nav-burger:hover{border-color:var(--blue-light);background:var(--blue-soft)}
.nav-burger[aria-expanded="true"] span{background:transparent}
.nav-burger[aria-expanded="true"] span::before{top:0;transform:rotate(45deg)}
.nav-burger[aria-expanded="true"] span::after{top:0;transform:rotate(-45deg)}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:44px;padding:0 24px;border-radius:var(--r-btn);font-size:15px;font-weight:600;border:1px solid transparent;cursor:pointer;transition:background var(--fast),color var(--fast),border-color var(--fast),transform var(--fast),box-shadow var(--fast)}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-dark);transform:translateY(-1px)}
.btn-primary:active{transform:translateY(0)}
.btn-outline{background:#fff;border-color:var(--line-strong);color:var(--blue)}
.btn-outline:hover{border-color:var(--blue);background:var(--blue-soft)}
.btn-outline:active{background:var(--blue-pale)}
.btn-sm{height:40px;padding:0 20px;font-size:15px}
.btn-block{width:100%}
.btn:disabled{opacity:.45;cursor:not-allowed;transform:none}
.link-arrow{display:inline-flex;align-items:center;gap:6px;color:var(--blue);font-size:14px;font-weight:600;min-height:44px;transition:color var(--fast)}
.link-arrow .arw{transition:transform var(--ease)}
.link-arrow:hover{color:var(--blue-dark)}
.link-arrow:hover .arw{transform:translateX(2px)}

/* ---------- 移动菜单 ---------- */
.menu-mask{position:fixed;inset:0;background:rgba(14,42,56,.45);opacity:0;pointer-events:none;transition:opacity var(--ease);z-index:98}
.menu-mask.open{opacity:1;pointer-events:auto}
.mobile-menu{position:fixed;top:60px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 14px 40px rgba(14,42,56,.10);transform:translateY(-12px);opacity:0;pointer-events:none;transition:opacity var(--ease),transform var(--ease);z-index:99;padding:8px 24px 20px;max-height:calc(100vh - 60px);overflow-y:auto}
.mobile-menu.open{opacity:1;transform:translateY(0);pointer-events:auto}
.mobile-menu li{border-bottom:1px solid var(--line)}
.mobile-menu li:last-child{border-bottom:none}
.mobile-menu a{display:flex;align-items:center;min-height:52px;font-size:16px;font-weight:500;color:var(--ink);transition:color var(--fast)}
.mobile-menu a:hover,.mobile-menu a:active{color:var(--blue)}
.mobile-menu .btn{margin-top:16px}

/* ---------- 面包屑 ---------- */
.crumb-bar{background:var(--blue-soft);padding:14px 0}
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--muted);line-height:1.6}
.breadcrumb a{color:var(--muted);transition:color var(--fast)}
.breadcrumb a:hover{color:var(--blue)}
.breadcrumb .sep{color:var(--line-strong)}
.breadcrumb .current{color:var(--ink);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;max-width:520px}

/* ---------- 文章布局 ---------- */
.article-layout{display:grid;grid-template-columns:minmax(0,760px) 300px;gap:48px;justify-content:center;padding:44px 0 72px}
.article-main{min-width:0}
.post-head{padding-bottom:24px;border-bottom:1px solid var(--line)}
.badge{display:inline-flex;align-items:center;gap:6px;font-size:12px;line-height:1.6;padding:2px 10px;border-radius:var(--r-pill);background:var(--blue-pale);color:var(--blue-dark);font-weight:600}
.badge-amber{background:var(--amber-pale);color:var(--amber-text)}
.post-title{font-size:clamp(26px,3vw,34px);line-height:1.35;font-weight:700;margin:16px 0 0;word-break:break-word}
.post-meta{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:16px;font-size:13px;color:var(--muted)}
.post-meta .dot{width:1px;height:12px;background:var(--line-strong);display:inline-block}
.article-body{margin-top:28px;font-size:17px;line-height:1.9;color:var(--text)}
.article-body>*+*{margin-top:1.15em}
.article-body h2{font-size:24px;line-height:1.4;font-weight:600;margin:40px 0 16px;padding-left:12px;border-left:4px solid var(--blue);color:var(--ink)}
.article-body h3{font-size:19px;line-height:1.5;font-weight:600;margin:28px 0 12px;color:var(--ink)}
.article-body h4{font-size:17px;font-weight:600;margin:22px 0 10px;color:var(--ink)}
.article-body p{margin:0 0 1.05em}
.article-body ul,.article-body ol{margin:0 0 1.1em;padding-left:1.4em}
.article-body ul{list-style:disc}
.article-body ol{list-style:decimal}
.article-body li{margin-bottom:8px}
.article-body li::marker{color:var(--blue)}
.article-body a{color:var(--blue);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px;transition:color var(--fast)}
.article-body a:hover{color:var(--blue-dark)}
.article-body blockquote{margin:24px 0;padding:16px 20px;background:var(--blue-soft);border-left:3px solid var(--blue);border-radius:0 12px 12px 0;color:var(--text)}
.article-body blockquote p:last-child{margin-bottom:0}
.article-body img{width:100%;border-radius:var(--r-img);margin:20px 0 8px}
.article-body figure{margin:24px 0}
.article-body figcaption{font-size:13px;color:var(--muted);text-align:center;margin-top:8px}
.article-body table{width:100%;border-collapse:collapse;margin:24px 0;font-size:15px}
.article-body th{background:var(--blue-pale);color:var(--blue-dark);font-weight:600}
.article-body th,.article-body td{border:1px solid var(--line);padding:12px;text-align:left;vertical-align:top}
.article-body pre{background:var(--dark);color:#EAF2F6;padding:16px 18px;border-radius:var(--r-img);overflow-x:auto;font-size:14px;line-height:1.7}

/* ---------- 文末 ---------- */
.post-foot{margin-top:40px;padding-top:24px;border-top:1px solid var(--line)}
.tag-row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.tag-row .label{font-size:13px;color:var(--muted)}
.tag{display:inline-flex;align-items:center;min-height:30px;padding:2px 12px;border-radius:var(--r-pill);background:#fff;border:1px solid var(--line);font-size:13px;color:var(--text);transition:border-color var(--fast),color var(--fast),background var(--fast)}
.tag:hover{border-color:var(--blue);color:var(--blue);background:var(--blue-soft)}
.post-nav{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:24px}
.post-nav-card{display:block;padding:18px 20px;background:#fff;border:1px solid var(--line);border-radius:var(--r-card);transition:background var(--fast),border-color var(--fast),transform var(--fast),box-shadow var(--fast)}
.post-nav-card:hover{background:var(--blue-soft);border-color:var(--line-strong);transform:translateY(-2px);box-shadow:var(--sh-card)}
.post-nav-card .k{display:flex;align-items:center;gap:6px;font-size:13px;color:var(--muted)}
.post-nav-card .v{margin-top:6px;font-size:16px;font-weight:600;color:var(--ink);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.post-nav-card:hover .v{color:var(--blue)}
.back-row{margin-top:24px}

.empty-state{min-height:280px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;text-align:center;background:#fff;border:1px solid var(--line);border-radius:var(--r-card);padding:40px 24px;margin-top:28px}
.empty-state p{font-size:15px;color:var(--muted)}
.empty-icon{width:48px;height:48px;stroke:var(--line-strong);fill:none;stroke-width:1.6}

/* ---------- 相关推荐 ---------- */
.related{margin-top:56px}
.related-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:20px}
.related-head h2{font-size:20px;font-weight:600}
.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.rel-card{display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;box-shadow:var(--sh-card);transition:transform var(--fast),box-shadow var(--fast),border-color var(--fast)}
.rel-card:hover{transform:translateY(-4px);box-shadow:var(--sh-hover);border-color:var(--line-strong)}
.rel-thumb{aspect-ratio:16/10;background:var(--bg) center/cover no-repeat;overflow:hidden}
.rel-thumb img{width:100%;height:100%;object-fit:cover;transition:transform var(--ease)}
.rel-card:hover .rel-thumb img{transform:scale(1.03)}
.rel-body{padding:18px 18px 20px}
.rel-body h3{font-size:16px;line-height:1.5;font-weight:600;transition:color var(--fast)}
.rel-card:hover .rel-body h3{color:var(--blue)}
.rel-body p{margin-top:8px;font-size:13px;line-height:1.7;color:var(--muted)}

/* ---------- 侧栏 ---------- */
.article-side{min-width:0}
.side-inner{position:sticky;top:96px;display:flex;flex-direction:column;gap:20px}
.side-block{background:#fff;border:1px solid var(--line);border-radius:var(--r-card);padding:20px;box-shadow:var(--sh-card)}
.side-title{font-size:15px;font-weight:600;color:var(--ink);padding-bottom:12px;border-bottom:1px solid var(--line)}
.side-list{margin-top:14px;display:flex;flex-direction:column;gap:12px}
.side-list a{position:relative;display:block;padding-left:14px;font-size:14px;line-height:1.65;color:var(--text);transition:color var(--fast)}
.side-list a::before{content:"";position:absolute;left:0;top:9px;width:4px;height:4px;border-radius:50%;background:var(--blue)}
.side-list a:hover{color:var(--blue)}
.side-cta{background:var(--blue-pale);border-radius:var(--r-img);padding:20px;border:1px solid #D6E6EE}
.side-cta p{font-size:14px;line-height:1.75;color:var(--blue-dark)}
.side-cta .btn{margin-top:14px}
.side-facts{display:flex;flex-direction:column;gap:10px;margin-top:14px}
.side-facts li{display:flex;align-items:baseline;justify-content:space-between;gap:12px;font-size:14px;color:var(--muted);padding-bottom:10px;border-bottom:1px dashed var(--line)}
.side-facts li:last-child{border-bottom:none;padding-bottom:0}
.side-facts b{color:var(--ink);font-weight:600;font-size:14px}

/* ---------- 底部转化 ---------- */
.cta-section{padding:0 0 88px}
.cta-card{background:#EDF4F7;border-radius:var(--r-block);padding:56px 40px;text-align:center}
.cta-card h2{font-size:clamp(24px,3vw,32px);line-height:1.3;font-weight:600}
.cta-card p{margin:14px auto 0;max-width:620px;font-size:16px;color:var(--text)}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-top:26px}
.cta-form{display:grid;grid-template-columns:1fr 1fr;gap:16px;max-width:760px;margin:32px auto 0;text-align:left}
.field{display:flex;flex-direction:column}
.field.full{grid-column:1/-1}
.field label{font-size:14px;font-weight:500;color:var(--ink);margin-bottom:6px}
.field input,.field textarea{width:100%;border:1px solid var(--line-strong);border-radius:var(--r-btn);background:#fff;padding:0 14px;height:44px;font-size:15px;font-family:inherit;color:var(--text);transition:border-color var(--fast),box-shadow var(--fast)}
.field textarea{height:104px;padding:12px 14px;line-height:1.7;resize:vertical}
.field input::placeholder,.field textarea::placeholder{color:#9AABB3}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--blue);box-shadow:var(--ring)}
.cta-form .btn{grid-column:1/-1;justify-self:center;min-width:180px}

/* ---------- 浮动 CTA ---------- */
.float-cta{position:fixed;right:28px;bottom:28px;z-index:90;display:inline-flex;align-items:center;gap:8px;height:48px;padding:0 22px;border-radius:var(--r-pill);background:var(--blue);color:#fff;font-size:15px;font-weight:600;box-shadow:var(--sh-float);opacity:0;transform:translateY(12px);pointer-events:none;transition:opacity 200ms ease-out,transform 200ms ease-out,background var(--fast)}
.float-cta.is-visible{opacity:1;transform:translateY(0);pointer-events:auto}
.float-cta:hover{background:var(--blue-dark);transform:translateY(-2px)}
.float-cta:hover .arw{transform:translateX(2px)}
.float-cta .arw{transition:transform var(--ease)}
.float-cta:active{transform:translateY(0)}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--dark);padding:64px 0 32px;color:rgba(255,255,255,.72)}
.footer-grid{display:grid;grid-template-columns:4fr 2fr 3fr 3fr;gap:40px}
.f-brand{display:inline-flex;align-items:center;gap:10px;min-height:44px}
.f-brand .brand-text{color:#fff;font-size:18px;font-weight:600}
.f-brand .brand-mark{background:rgba(255,255,255,.14)}
.f-brand:hover .brand-text{color:#fff}
.site-footer p{font-size:14px;line-height:1.8;color:rgba(255,255,255,.72);margin-top:14px;max-width:320px}
.site-footer .f-contact{font-size:13px;color:rgba(255,255,255,.55)}
.f-title{font-size:14px;font-weight:600;color:#fff;margin-bottom:16px;letter-spacing:0}
.f-links{display:flex;flex-direction:column;gap:4px}
.f-links a{display:inline-flex;align-items:center;min-height:36px;font-size:14px;color:rgba(255,255,255,.72);transition:color var(--fast)}
.f-links a:hover{color:#fff;text-decoration:underline;text-underline-offset:4px}
.f-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:2px}
.f-tags span{display:inline-flex;align-items:center;height:26px;padding:0 12px;border-radius:var(--r-pill);background:rgba(255,255,255,.08);font-size:12px;color:rgba(255,255,255,.78)}
.f-note{margin-top:0;font-size:13px;line-height:1.8;color:rgba(255,255,255,.6)}
.footer-bottom{margin-top:40px;padding-top:20px;border-top:1px solid rgba(255,255,255,.12);display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;font-size:13px;color:rgba(255,255,255,.55)}

/* ---------- 响应式 ---------- */
@media (max-width:1279px){
  .article-layout{grid-template-columns:minmax(0,1fr) 280px;gap:36px}
}
@media (max-width:1199px){
  .article-layout{grid-template-columns:minmax(0,1fr);padding:36px 0 64px;gap:32px}
  .side-inner{position:static;flex-direction:row;flex-wrap:wrap}
  .side-inner>*{flex:1 1 280px}
}
@media (max-width:1023px){
  .nav-links{display:none}
  .nav-burger{display:inline-flex}
  .nav-grid{height:60px;grid-template-columns:1fr auto 1fr}
  .brand{padding:0;justify-self:start;grid-column:1}
  .nav-burger{grid-column:3}
  .site-header{border-bottom:1px solid var(--line)}
  .related-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .cta-card{padding:44px 28px}
  .cta-section{padding-bottom:72px}
}
@media (max-width:767px){
  .container{padding:0 18px}
  body{font-size:16px;padding-bottom:72px}
  .article-layout{padding:28px 0 56px}
  .post-title{font-size:26px}
  .article-body{font-size:17px;margin-top:22px}
  .article-body h2{font-size:21px;margin-top:32px}
  .article-body h3{font-size:18px}
  .post-nav{grid-template-columns:1fr}
  .related-grid{grid-template-columns:1fr}
  .related-head{flex-direction:column;align-items:flex-start;gap:6px}
  .cta-form{grid-template-columns:1fr;padding:0}
  .cta-card{padding:36px 20px;border-radius:20px}
  .cta-actions .btn{width:100%}
  .cta-form .btn{width:100%;justify-self:stretch}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-bottom{flex-direction:column;gap:6px}
  .float-cta{right:0;left:0;bottom:0;height:56px;border-radius:0;justify-content:center;padding:0 18px;padding-bottom:env(safe-area-inset-bottom);box-shadow:0 -6px 20px rgba(14,42,56,.16);font-size:15px}
  .float-cta:hover{transform:none}
  .side-inner{flex-direction:column}
  .side-inner>*{flex:1 1 auto}
}
@media (max-width:480px){
  .brand-text{font-size:16px}
  .post-meta{font-size:12px;gap:8px}
  .breadcrumb .current{max-width:200px}
  .article-body table{display:block;overflow-x:auto;white-space:nowrap}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important}
  html{scroll-behavior:auto}
}

/* roulang page: category1 */
:root{
  --brand:#1D5B79;
  --brand-dark:#14415A;
  --brand-light:#2A7A9B;
  --brand-soft:#E8F1F5;
  --amber:#D9963F;
  --amber-soft:#FBF1E1;
  --amber-text:#8A5A18;
  --teal:#4FA3A5;
  --ink:#1E2A32;
  --text:#3D4C56;
  --muted:#6C7E88;
  --line:#E2E9ED;
  --line-strong:#C9D7DE;
  --bg:#F6F9FA;
  --bg-soft:#F2F7F9;
  --card:#FFFFFF;
  --dark:#0E2A38;
  --radius-card:16px;
  --radius-img:12px;
  --radius-btn:10px;
  --radius-pill:999px;
  --shadow-card:0 6px 20px rgba(14,42,56,.07);
  --shadow-hover:0 14px 40px rgba(14,42,56,.10);
  --shadow-mid:0 10px 28px rgba(14,42,56,.10);
  --focus-ring:0 0 0 3px rgba(42,122,155,.28);
  --ease:220ms ease-out;
  --ease-fast:160ms ease-out;
  --space-1:4px; --space-2:8px; --space-3:12px; --space-4:16px;
  --space-5:24px; --space-6:32px; --space-7:48px; --space-8:64px;
  --space-9:96px; --space-10:120px;
}
*,*::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","Noto Sans SC",system-ui,sans-serif;
  font-size:16px;
  line-height:1.85;
  color:var(--text);
  background:var(--bg);
  letter-spacing:0;
  -webkit-font-smoothing:antialiased;
  padding-bottom:0;
}
img{max-width:100%;display:block;border:0;}
a{color:var(--brand);text-decoration:none;transition:color var(--ease-fast);}
a:hover{color:var(--brand-dark);}
ul,ol{margin:0;padding:0;list-style:none;}
button{font-family:inherit;cursor:pointer;border:0;background:none;}
h1,h2,h3,h4{margin:0;color:var(--ink);font-weight:600;letter-spacing:0;}
h1{font-size:clamp(28px,4vw,40px);line-height:1.24;font-weight:700;}
h2{font-size:clamp(24px,3vw,34px);line-height:1.3;}
h3{font-size:clamp(17px,1.5vw,21px);line-height:1.45;}
p{margin:0;}
:focus-visible{outline:none;box-shadow:var(--focus-ring);border-radius:6px;}
.container{
  width:100%;
  max-width:1200px;
  margin:0 auto;
  padding:0 24px;
}
/* ---------- header ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:100;
  background:#fff;
  border-bottom:1px solid var(--line);
  transition:box-shadow var(--ease);
}
.site-header.is-scrolled{box-shadow:0 1px 0 var(--line),0 6px 18px rgba(14,42,56,.06);}
.nav-grid{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  height:72px;
  gap:16px;
}
.nav-links{
  display:flex;
  align-items:center;
  gap:26px;
}
.nav-links.left{justify-self:start;}
.nav-links.right{justify-self:end;gap:22px;}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  font-size:15px;
  font-weight:500;
  color:var(--text);
  transition:color var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:50%;
  bottom:8px;
  width:60%;
  height:2px;
  background:var(--brand);
  transform:translateX(-50%) scaleX(0);
  transform-origin:center;
  transition:transform var(--ease);
  border-radius:2px;
}
.nav-link:hover{color:var(--brand);}
.nav-link:hover::after{transform:translateX(-50%) scaleX(1);}
.nav-link.active{color:var(--brand);}
.nav-link.active::after{transform:translateX(-50%) scaleX(1);}
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin:0 40px;
  color:var(--ink);
  font-size:18px;
  font-weight:600;
  transition:color var(--ease);
}
.brand:hover{color:var(--brand);}
.brand-mark{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:28px;
  height:28px;
  border-radius:8px;
  background:var(--brand);
  color:#fff;
  font-size:15px;
  font-weight:700;
  line-height:1;
  flex:0 0 auto;
}
.brand-text{white-space:nowrap;}
.nav-burger{
  display:none;
  align-items:center;
  justify-content:center;
  width:44px;
  height:44px;
  border-radius:10px;
  justify-self:end;
  transition:background var(--ease-fast);
}
.nav-burger span{
  position:relative;
  display:block;
  width:20px;
  height:2px;
  background:var(--ink);
  border-radius:2px;
  transition:background var(--ease-fast);
}
.nav-burger span::before,
.nav-burger span::after{
  content:"";
  position:absolute;
  left:0;
  width:20px;
  height:2px;
  background:var(--ink);
  border-radius:2px;
  transition:transform var(--ease),top var(--ease),bottom var(--ease);
}
.nav-burger span::before{top:-6px;}
.nav-burger span::after{bottom:-6px;}
.nav-burger:hover{background:var(--bg-soft);}
.nav-burger.is-open span{background:transparent;}
.nav-burger.is-open span::before{top:0;transform:rotate(45deg);}
.nav-burger.is-open span::after{bottom:0;transform:rotate(-45deg);}
.menu-backdrop{
  position:fixed;
  inset:0;
  background:rgba(14,42,56,.45);
  opacity:0;
  pointer-events:none;
  transition:opacity var(--ease);
  z-index:98;
}
.menu-backdrop.is-open{opacity:1;pointer-events:auto;}
.mobile-menu{
  position:fixed;
  left:0;
  right:0;
  top:0;
  z-index:99;
  background:#fff;
  padding:76px 24px 24px;
  transform:translateY(-12px);
  opacity:0;
  pointer-events:none;
  transition:opacity var(--ease),transform var(--ease);
  border-bottom:1px solid var(--line);
  box-shadow:0 18px 40px rgba(14,42,56,.14);
}
.mobile-menu.is-open{opacity:1;transform:translateY(0);pointer-events:auto;}
.mobile-menu ul{margin-bottom:16px;}
.mobile-menu li + li{border-top:1px solid var(--line);}
.mobile-menu li a{
  display:flex;
  align-items:center;
  height:52px;
  font-size:16px;
  font-weight:500;
  color:var(--text);
}
.mobile-menu li a:hover,.mobile-menu li a:active{color:var(--brand);}
.mobile-menu .btn{width:100%;}
/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:44px;
  padding:0 24px;
  font-size:15px;
  font-weight:600;
  border-radius:var(--radius-btn);
  border:1px solid transparent;
  transition:background var(--ease-fast),border-color var(--ease-fast),color var(--ease-fast),transform var(--ease-fast),box-shadow var(--ease-fast);
}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 4px 12px rgba(29,91,121,.20);}
.btn-primary:hover{background:var(--brand-dark);color:#fff;transform:translateY(-1px);box-shadow:0 8px 20px rgba(29,91,121,.26);}
.btn-primary:active{transform:translateY(0);}
.btn-secondary{background:#fff;border-color:var(--line-strong);color:var(--brand);}
.btn-secondary:hover{border-color:var(--brand);background:var(--bg-soft);color:var(--brand-dark);}
.btn-secondary:active{transform:translateY(1px);}
.btn-sm{min-height:40px;padding:0 20px;font-size:15px;}
.btn-block{width:100%;}
.text-link{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-size:13px;
  font-weight:600;
  color:var(--brand);
  min-height:32px;
  transition:color var(--ease-fast);
}
.text-link .arrow{transition:transform var(--ease-fast);}
.text-link:hover{color:var(--brand-dark);}
.text-link:hover .arrow{transform:translateX(2px);}
/* ---------- page hero ---------- */
.page-hero{
  background:var(--bg-soft);
  border-bottom:1px solid var(--line);
  padding:48px 0 40px;
}
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:6px;
  font-size:13px;
  color:var(--muted);
  margin-bottom:16px;
}
.breadcrumb a{color:var(--muted);}
.breadcrumb a:hover{color:var(--brand);}
.breadcrumb .sep{color:#B7C6CD;}
.breadcrumb .current{color:var(--ink);}
.page-hero h1{max-width:840px;}
.page-hero .lead{
  margin-top:16px;
  max-width:680px;
  font-size:17px;
  line-height:1.9;
  color:var(--text);
}
.hero-tags{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:24px;
}
.badge{
  display:inline-flex;
  align-items:center;
  padding:2px 10px;
  font-size:12px;
  font-weight:500;
  border-radius:var(--radius-pill);
  background:var(--brand-soft);
  color:var(--brand-dark);
  line-height:1.7;
}
.badge-amber{background:var(--amber-soft);color:var(--amber-text);}
.badge-outline{background:#fff;border:1px solid var(--line-strong);color:var(--muted);}
/* ---------- sections ---------- */
.section{padding:96px 0;}
.section-tight{padding:72px 0;}
.section-head{max-width:680px;margin-bottom:40px;}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center;}
.section-head h2{margin-bottom:12px;}
.section-head p{font-size:16px;color:var(--muted);line-height:1.85;}
/* ---------- stat strip ---------- */
.stat-strip{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:0;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  box-shadow:var(--shadow-card);
  margin-top:-36px;
  position:relative;
  z-index:2;
  overflow:hidden;
}
.stat{
  padding:24px;
  display:flex;
  flex-direction:column;
  gap:6px;
}
.stat + .stat{border-left:1px solid var(--line);}
.stat-num{
  font-size:32px;
  line-height:1;
  font-weight:700;
  color:var(--brand);
}
.stat-num small{font-size:15px;font-weight:600;margin-left:2px;}
.stat-label{font-size:13px;color:var(--muted);}
/* ---------- filter bar ---------- */
.filter-bar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:16px;
  margin-bottom:28px;
}
.filter-count{font-size:13px;color:var(--muted);}
.chip-group{display:flex;flex-wrap:wrap;gap:10px;}
.chip{
  display:inline-flex;
  align-items:center;
  min-height:32px;
  padding:0 16px;
  font-size:13px;
  font-weight:500;
  border-radius:var(--radius-pill);
  background:#fff;
  border:1px solid var(--line-strong);
  color:var(--text);
  transition:background var(--ease-fast),border-color var(--ease-fast),color var(--ease-fast);
}
.chip:hover{border-color:var(--brand-light);color:var(--brand);background:var(--bg-soft);}
.chip.is-active{background:var(--brand);border-color:var(--brand);color:#fff;}
.chip.is-active:hover{background:var(--brand-dark);border-color:var(--brand-dark);color:#fff;}
/* ---------- card grid ---------- */
.card-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:24px;
}
.v-card{
  display:flex;
  flex-direction:column;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  box-shadow:var(--shadow-card);
  overflow:hidden;
  transition:transform var(--ease),box-shadow var(--ease);
}
.v-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);}
.v-card-media{
  position:relative;
  aspect-ratio:16/9;
  background:var(--bg);
  overflow:hidden;
}
.v-card-media img{
  width:100%;
  height:100%;
  object-fit:cover;
  transition:transform var(--ease);
}
.v-card:hover .v-card-media img{transform:scale(1.03);}
.v-card-body{
  padding:24px;
  display:flex;
  flex-direction:column;
  gap:12px;
  flex:1;
}
.v-card-body h3{
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
  transition:color var(--ease-fast);
}
.v-card:hover .v-card-body h3{color:var(--brand);}
.v-card-body p{
  font-size:14px;
  line-height:1.75;
  color:var(--muted);
  display:-webkit-box;
  -webkit-line-clamp:3;
  -webkit-box-orient:vertical;
  overflow:hidden;
}
.v-card-foot{
  margin-top:auto;
  padding-top:16px;
  border-top:1px solid var(--line);
  display:flex;
  align-items:center;
  gap:8px;
  flex-wrap:wrap;
  justify-content:space-between;
}
.v-card-foot .meta{font-size:13px;color:var(--muted);}
.dot{
  width:3px;height:3px;border-radius:50%;
  background:var(--line-strong);
  display:inline-block;
}
.grid-foot{
  margin-top:40px;
  display:flex;
  justify-content:center;
}
/* ---------- steps ---------- */
.steps-wrap{
  display:grid;
  grid-template-columns:4fr 7fr;
  gap:56px;
  align-items:start;
}
.steps-aside{position:sticky;top:96px;}
.steps-aside h2{margin-bottom:14px;}
.steps-aside p{font-size:15px;color:var(--muted);line-height:1.85;margin-bottom:20px;}
.steps-list{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  box-shadow:var(--shadow-card);
  padding:8px 28px;
}
.step{
  display:grid;
  grid-template-columns:56px 1fr auto;
  align-items:center;
  gap:16px;
  padding:24px 0;
  transition:background var(--ease-fast);
  border-radius:10px;
}
.step + .step{border-top:1px solid var(--line);}
.step-num{
  font-size:20px;
  font-weight:700;
  color:var(--brand);
  line-height:1;
}
.step-body h3{font-size:17px;margin-bottom:4px;}
.step-body p{font-size:14px;line-height:1.8;color:var(--muted);}
.step-tag{
  font-size:12px;
  color:var(--amber-text);
  background:var(--amber-soft);
  border-radius:var(--radius-pill);
  padding:2px 10px;
  white-space:nowrap;
}
/* ---------- faq ---------- */
.faq-wrap{
  display:grid;
  grid-template-columns:4fr 8fr;
  gap:56px;
  align-items:start;
}
.faq-aside{position:sticky;top:96px;}
.faq-aside h2{margin-bottom:14px;}
.faq-aside p{font-size:15px;color:var(--muted);line-height:1.85;margin-bottom:16px;}
.faq-item{
  background:#fff;
  border:1px solid var(--line);
  border-radius:12px;
  margin-bottom:10px;
  transition:border-color var(--ease-fast),background var(--ease-fast);
  overflow:hidden;
}
.faq-item.is-open{
  border-color:rgba(29,91,121,.4);
  background:#FBFDFE;
}
.faq-q{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  width:100%;
  padding:18px 20px;
  text-align:left;
  font-size:16px;
  font-weight:600;
  color:var(--ink);
  min-height:44px;
  transition:color var(--ease-fast);
}
.faq-q:hover{color:var(--brand);}
.faq-icon{
  position:relative;
  flex:0 0 auto;
  width:16px;
  height:16px;
  transition:transform var(--ease);
}
.faq-icon::before,
.faq-icon::after{
  content:"";
  position:absolute;
  background:var(--brand);
  border-radius:2px;
}
.faq-icon::before{left:0;top:7px;width:16px;height:2px;}
.faq-icon::after{left:7px;top:0;width:2px;height:16px;transition:opacity var(--ease-fast);}
.faq-item.is-open .faq-icon{transform:rotate(45deg);}
.faq-a{
  max-height:0;
  overflow:hidden;
  transition:max-height var(--ease);
}
.faq-item.is-open .faq-a{max-height:420px;}
.faq-a-inner{
  padding:0 20px 18px;
  font-size:15px;
  line-height:1.8;
  color:var(--text);
}
/* ---------- cta / form ---------- */
.cta-card{
  background:#EDF4F7;
  border-radius:24px;
  padding:56px 40px;
  border:1px solid #DCE9EF;
}
.cta-head{text-align:center;max-width:640px;margin:0 auto 32px;}
.cta-head h2{margin-bottom:14px;}
.cta-head p{font-size:16px;color:var(--text);line-height:1.85;}
.cta-actions{
  display:flex;
  justify-content:center;
  flex-wrap:wrap;
  gap:12px;
  margin-bottom:40px;
}
.form-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:20px;
  max-width:760px;
  margin:0 auto;
}
.form-field{display:flex;flex-direction:column;}
.form-field.full{grid-column:1 / -1;}
.form-field label{
  font-size:14px;
  font-weight:500;
  color:var(--ink);
  margin-bottom:6px;
}
.form-field input,
.form-field textarea{
  min-height:44px;
  padding:10px 14px;
  font-family:inherit;
  font-size:15px;
  line-height:1.6;
  color:var(--ink);
  background:#fff;
  border:1px solid var(--line-strong);
  border-radius:var(--radius-btn);
  transition:border-color var(--ease-fast),box-shadow var(--ease-fast);
}
.form-field textarea{resize:vertical;min-height:110px;}
.form-field input::placeholder,
.form-field textarea::placeholder{color:#9AABB3;}
.form-field input:focus,
.form-field textarea:focus{
  outline:none;
  border-color:var(--brand);
  box-shadow:var(--focus-ring);
}
.form-note{
  grid-column:1 / -1;
  font-size:13px;
  color:var(--muted);
  line-height:1.7;
}
.form-msg{
  grid-column:1 / -1;
  font-size:14px;
  color:var(--brand-dark);
  background:#fff;
  border:1px solid var(--line-strong);
  border-radius:var(--radius-btn);
  padding:12px 16px;
  display:none;
}
.form-msg.is-visible{display:block;}
/* ---------- footer ---------- */
.site-footer{
  background:var(--dark);
  color:rgba(255,255,255,.72);
  padding:64px 0 32px;
  margin-top:96px;
}
.footer-grid{
  display:grid;
  grid-template-columns:4fr 2fr 3fr 3fr;
  gap:40px;
}
.f-brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  color:#fff;
  font-size:18px;
  font-weight:600;
  margin-bottom:16px;
}
.f-brand:hover{color:#fff;}
.site-footer p{font-size:14px;line-height:1.85;color:rgba(255,255,255,.72);}
.f-contact{margin-top:12px;font-size:13px;color:rgba(255,255,255,.55);}
.f-title{
  font-size:14px;
  font-weight:600;
  color:#fff;
  margin-bottom:16px;
}
.f-links{display:flex;flex-direction:column;gap:10px;}
.f-links a{
  font-size:14px;
  color:rgba(255,255,255,.72);
  transition:color var(--ease-fast);
  width:fit-content;
}
.f-links a:hover{color:#fff;text-decoration:underline;text-underline-offset:4px;}
.f-tags{display:flex;flex-wrap:wrap;gap:8px;}
.f-tags span{
  display:inline-flex;
  align-items:center;
  padding:3px 12px;
  font-size:12px;
  border-radius:var(--radius-pill);
  background:rgba(255,255,255,.08);
  color:rgba(255,255,255,.78);
  transition:background var(--ease-fast);
}
.f-tags span:hover{background:rgba(255,255,255,.16);}
.f-note{font-size:13px;line-height:1.8;color:rgba(255,255,255,.62);}
.footer-bottom{
  margin-top:40px;
  padding-top:24px;
  border-top:1px solid rgba(255,255,255,.12);
  display:flex;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:12px;
  font-size:13px;
  color:rgba(255,255,255,.55);
}
/* ---------- float cta ---------- */
.float-cta{
  position:fixed;
  right:28px;
  bottom:28px;
  z-index:90;
  display:inline-flex;
  align-items:center;
  gap:8px;
  height:48px;
  padding:0 22px;
  border-radius:var(--radius-pill);
  background:var(--brand);
  color:#fff;
  font-size:15px;
  font-weight:600;
  box-shadow:0 10px 28px rgba(29,91,121,.32);
  opacity:0;
  transform:translateY(10px);
  transition:opacity 200ms ease-out,transform 200ms ease-out,background var(--ease-fast);
  pointer-events:none;
}
.float-cta.is-visible{opacity:1;transform:translateY(0);pointer-events:auto;}
.float-cta:hover{background:var(--brand-dark);color:#fff;transform:translateY(-2px);}
.float-cta .arrow{transition:transform var(--ease-fast);}
.float-cta:hover .arrow{transform:translateX(2px);}
/* ---------- responsive ---------- */
@media (max-width:1279px){
  .steps-wrap,.faq-wrap{gap:40px;}
}
@media (max-width:1023px){
  .nav-grid{grid-template-columns:1fr auto;height:60px;}
  .brand{margin:0;justify-self:start;font-size:17px;}
  .nav-links{display:none;}
  .nav-burger{display:flex;}
  .section{padding:72px 0;}
  .section-tight{padding:56px 0;}
  .page-hero{padding:36px 0 32px;}
  .card-grid{grid-template-columns:repeat(2,1fr);gap:20px;}
  .stat-strip{grid-template-columns:repeat(2,1fr);}
  .stat + .stat{border-left:0;}
  .stat:nth-child(2n){border-left:1px solid var(--line);}
  .stat:nth-child(n+3){border-top:1px solid var(--line);}
  .steps-wrap,.faq-wrap{grid-template-columns:1fr;gap:32px;}
  .steps-aside,.faq-aside{position:static;}
  .footer-grid{grid-template-columns:repeat(2,1fr);gap:32px;}
  .site-footer{margin-top:72px;}
}
@media (max-width:767px){
  .container{padding:0 18px;}
  body{font-size:15px;}
  .section{padding:56px 0;}
  .section-tight{padding:48px 0;}
  .page-hero{padding:28px 0 28px;}
  .page-hero .lead{font-size:15px;line-height:1.85;}
  .card-grid{grid-template-columns:1fr;gap:16px;}
  .stat-strip{grid-template-columns:1fr;margin-top:0;}
  .stat + .stat{border-left:0;border-top:1px solid var(--line);}
  .stat:nth-child(2n){border-left:0;}
  .stat{padding:20px;}
  .steps-list{padding:4px 20px;}
  .step{grid-template-columns:40px 1fr;gap:12px;padding:20px 0;}
  .step-tag{grid-column:2;justify-self:start;margin-top:8px;}
  .cta-card{padding:32px 20px;border-radius:16px;}
  .form-grid{grid-template-columns:1fr;gap:16px;}
  .cta-actions .btn{width:100%;}
  .footer-grid{grid-template-columns:1fr;gap:28px;}
  .footer-bottom{flex-direction:column;}
  .float-cta{
    left:0;
    right:0;
    bottom:0;
    height:auto;
    padding:10px 18px calc(10px + env(safe-area-inset-bottom));
    border-radius:0;
    justify-content:center;
    box-shadow:0 -8px 24px rgba(14,42,56,.16);
    opacity:1;
    transform:none;
    pointer-events:auto;
    background:#fff;
    color:var(--brand);
    border-top:1px solid var(--line);
  }
  .float-cta:hover{background:#fff;color:var(--brand-dark);transform:none;}
  .float-cta .float-inner{
    display:flex;
    align-items:center;
    justify-content:center;
    width:100%;
    height:44px;
    border-radius:var(--radius-btn);
    background:var(--brand);
    color:#fff;
    font-size:15px;
    font-weight:600;
  }
  body{padding-bottom:72px;}
  .v-card-body{padding:20px;}
  .filter-bar{gap:12px;}
  .chip{min-height:34px;padding:0 14px;}
}
@media (max-width:480px){
  h1{font-size:26px;}
  .page-hero h1{font-size:25px;}
  .brand-text{font-size:16px;}
  .stat-num{font-size:28px;}
  .faq-q{font-size:15px;padding:16px;}
  .faq-a-inner{padding:0 16px 16px;font-size:14px;}
}
@media (min-width:768px){
  .float-cta .float-inner{display:inline-flex;align-items:center;gap:8px;}
}

/* roulang page: category2 */
:root{
  --brand:#1D5B79;
  --brand-dark:#14415A;
  --brand-light:#2A7A9B;
  --brand-tint:#E8F1F5;
  --amber:#D9963F;
  --amber-tint:#FBF1E1;
  --amber-dark:#8A5A18;
  --teal:#4FA3A5;
  --ink:#1E2A32;
  --text:#3D4C56;
  --muted:#6C7E88;
  --line:#E2E9ED;
  --bg:#F6F9FA;
  --card:#FFFFFF;
  --dark:#0E2A38;
  --r-card:16px;
  --r-img:12px;
  --r-btn:10px;
  --r-pill:999px;
  --shadow-card:0 6px 20px rgba(14,42,56,.07);
  --shadow-hover:0 14px 40px rgba(14,42,56,.10);
  --focus-ring:0 0 0 3px rgba(42,122,155,.28);
  --s-1:4px; --s-2:8px; --s-3:12px; --s-4:16px; --s-5:24px; --s-6:32px; --s-7:48px; --s-8:64px; --s-9:96px;
}
*,*::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","Noto Sans SC",system-ui,sans-serif;
  font-size:16px;
  line-height:1.85;
  color:var(--text);
  background:var(--bg);
  letter-spacing:0;
}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
ul,ol{margin:0;padding:0;list-style:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
h1,h2,h3,h4,p{margin:0}
time{font-variant-numeric:tabular-nums}
:focus-visible{outline:none;box-shadow:var(--focus-ring);border-radius:6px}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:0 24px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;line-height:1;border:1px solid transparent;
  transition:background-color .16s ease-out,color .16s ease-out,border-color .16s ease-out,transform .16s ease-out,box-shadow .16s ease-out;
}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-dark);transform:translateY(-1px)}
.btn-primary:active{transform:translateY(0)}
.btn-outline{background:#fff;color:var(--brand);border-color:#C9D7DE}
.btn-outline:hover{border-color:var(--brand);background:#F2F7F9}
.btn-outline:active{background:var(--brand-tint)}
.btn-sm{min-height:40px;padding:0 20px}
.btn-block{width:100%}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.45;cursor:not-allowed;transform:none}

/* ---------- 徽章 ---------- */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  font-size:12px;line-height:1.6;padding:2px 10px;border-radius:var(--r-pill);
  background:var(--brand-tint);color:var(--brand-dark);
}
.badge-amber{background:var(--amber-tint);color:var(--amber-dark)}

/* ---------- 导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:100;background:#fff;
  border-bottom:1px solid var(--line);
  transition:box-shadow .22s ease-out;
}
.site-header.scrolled{box-shadow:0 1px 0 var(--line),0 6px 18px rgba(14,42,56,.05)}
.nav-grid{
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;
  height:72px;gap:16px;
}
.nav-links{display:flex;align-items:center;gap:26px}
.nav-links.right{justify-content:flex-end}
.nav-link{
  position:relative;display:inline-flex;align-items:center;
  min-height:44px;font-size:15px;color:var(--text);
  transition:color .22s ease-out;
}
.nav-link::after{
  content:"";position:absolute;left:50%;bottom:5px;
  width:60%;height:2px;background:var(--brand);border-radius:2px;
  transform:translateX(-50%) scaleX(0);transform-origin:center;
  transition:transform .22s ease-out;
}
.nav-link:hover{color:var(--brand)}
.nav-link:hover::after{transform:translateX(-50%) scaleX(1)}
.nav-link.active{color:var(--brand);font-weight:600}
.nav-link.active::after{transform:translateX(-50%) scaleX(1)}
.brand{display:inline-flex;align-items:center;gap:10px;padding:0 40px;min-height:44px}
.brand-mark{
  width:28px;height:28px;border-radius:8px;background:var(--brand);
  color:#fff;display:grid;place-items:center;font-size:14px;font-weight:700;flex:none;
}
.brand-text{font-size:18px;font-weight:600;color:var(--ink);transition:color .22s ease-out;white-space:nowrap}
.brand:hover .brand-text{color:var(--brand)}
.brand:focus-visible{box-shadow:var(--focus-ring)}
.nav-burger{
  display:none;width:44px;height:44px;border-radius:10px;
  align-items:center;justify-content:center;justify-self:end;
  border:1px solid transparent;
  transition:background-color .16s ease-out,border-color .16s ease-out;
}
.nav-burger:hover{background:var(--brand-tint)}
.nav-burger span{
  position:relative;display:block;width:20px;height:2px;background:var(--ink);border-radius:2px;
  transition:background-color .2s ease-out;
}
.nav-burger span::before,.nav-burger span::after{
  content:"";position:absolute;left:0;width:20px;height:2px;background:var(--ink);border-radius:2px;
  transition:transform .2s ease-out;
}
.nav-burger span::before{top:-6px}
.nav-burger span::after{top:6px}
.nav-burger[aria-expanded="true"] span{background:transparent}
.nav-burger[aria-expanded="true"] span::before{transform:translateY(6px) rotate(45deg)}
.nav-burger[aria-expanded="true"] span::after{transform:translateY(-6px) rotate(-45deg)}

.mobile-mask{
  position:fixed;inset:0;background:rgba(14,42,56,.45);z-index:98;
  opacity:0;pointer-events:none;transition:opacity .22s ease-out;
}
.mobile-mask.open{opacity:1;pointer-events:auto}
.mobile-menu{
  position:fixed;left:0;right:0;top:60px;z-index:99;background:#fff;
  border-bottom:1px solid var(--line);
  transform:translateY(-12px);opacity:0;pointer-events:none;
  transition:transform .22s ease-out,opacity .22s ease-out;
  max-height:calc(100vh - 60px);overflow-y:auto;
}
.mobile-menu.open{transform:translateY(0);opacity:1;pointer-events:auto}
.mobile-menu ul{padding:8px 18px 0}
.mobile-menu li{border-bottom:1px solid var(--line)}
.mobile-menu a{display:flex;align-items:center;min-height:52px;font-size:16px;font-weight:500;color:var(--text)}
.mobile-menu a:hover,.mobile-menu a:focus-visible{color:var(--brand)}
.mobile-menu .m-cta{padding:16px 18px calc(20px + env(safe-area-inset-bottom))}

/* ---------- 页头 ---------- */
.page-head{background:#F2F7F9;border-bottom:1px solid var(--line);padding:36px 0 56px}
.crumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--muted);margin-bottom:20px}
.crumb a{transition:color .16s ease-out}
.crumb a:hover{color:var(--brand)}
.crumb .sep{color:#C9D7DE}
.crumb .current{color:var(--ink)}
.page-head-grid{display:grid;grid-template-columns:7fr 5fr;gap:48px;align-items:center}
.page-head h1{
  font-size:clamp(28px,3.4vw,38px);line-height:1.28;font-weight:700;color:var(--ink);
  margin-bottom:16px;
}
.page-head .lead{font-size:17px;line-height:1.85;color:var(--text);max-width:640px}
.page-head .head-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}
.page-head figure{
  margin:0;border-radius:var(--r-card);overflow:hidden;box-shadow:var(--shadow-hover);
  aspect-ratio:16/10;background:#DFEAEF;
}
.page-head figure img{width:100%;height:100%;object-fit:cover}

/* ---------- 通用板块 ---------- */
.section{padding:96px 0}
.section-tight{padding:72px 0}
.sec-head{max-width:700px;margin-bottom:40px}
.sec-head h2{font-size:clamp(24px,3vw,34px);line-height:1.3;font-weight:600;color:var(--ink);margin-bottom:12px}
.sec-sub{font-size:16px;color:var(--muted);line-height:1.85}

/* ---------- 纵向列表主体 ---------- */
.list-layout{display:grid;grid-template-columns:240px 1fr;gap:48px;align-items:start}
.side-nav{position:sticky;top:96px}
.side-nav .side-title{
  font-size:13px;letter-spacing:.04em;color:var(--muted);
  padding:0 12px 10px;border-bottom:1px solid var(--line);margin-bottom:10px;
}
.side-nav a{
  display:flex;align-items:center;min-height:40px;padding:0 12px;
  border-left:3px solid transparent;border-radius:8px;
  font-size:15px;color:var(--text);
  transition:background-color .16s ease-out,color .16s ease-out,border-color .16s ease-out;
}
.side-nav a:hover{background:#F2F7F9;color:var(--brand)}
.side-nav a.active{
  background:#F2F7F9;color:var(--brand);font-weight:600;border-left-color:var(--brand);
}
.side-card{
  margin-top:24px;background:var(--brand-tint);border-radius:var(--r-card);padding:16px;
}
.side-card img{border-radius:var(--r-img);aspect-ratio:16/10;object-fit:cover;margin-bottom:12px;width:100%}
.side-card h3{font-size:15px;font-weight:600;color:var(--brand-dark);margin-bottom:6px}
.side-card p{font-size:13px;line-height:1.7;color:var(--text);margin-bottom:12px}

.list-main{min-width:0}
.list-topline{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding-bottom:12px;border-bottom:1px solid var(--line);margin-bottom:8px;
}
.list-topline .count{font-size:13px;color:var(--muted)}
.list-topline .hint{font-size:13px;color:var(--muted);display:inline-flex;align-items:center;gap:6px}
.list-topline .hint .dot{width:6px;height:6px;border-radius:50%;background:var(--teal);flex:none}

.op-item{
  display:grid;grid-template-columns:48px 1fr auto;gap:20px;align-items:start;
  padding:24px 12px 24px 0;border-bottom:1px solid var(--line);
  transition:background-color .16s ease-out;
}
.op-item:hover{background:#F8FBFC}
.op-item.is-hidden{display:none}
.op-num{
  width:48px;height:48px;border-radius:10px;background:var(--brand-tint);
  display:grid;place-items:center;font-size:20px;line-height:1;font-weight:700;color:var(--brand);
  font-variant-numeric:tabular-nums;
}
.op-body{min-width:0}
.op-title{font-size:18px;font-weight:600;color:var(--ink);margin-bottom:8px;transition:color .16s ease-out}
.op-item:hover .op-title{color:var(--brand)}
.op-desc{
  font-size:14px;line-height:1.75;color:var(--muted);margin-bottom:10px;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.op-meta{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:13px;color:var(--muted)}
.op-meta .dot{width:4px;height:4px;border-radius:50%;background:var(--teal);flex:none}
.op-link{
  display:inline-flex;align-items:center;gap:6px;min-height:44px;padding-left:8px;
  font-size:13px;font-weight:600;color:var(--brand);white-space:nowrap;
  transition:color .16s ease-out;
}
.op-link .arw{transition:transform .16s ease-out}
.op-link:hover{color:var(--brand-dark)}
.op-link:hover .arw{transform:translateX(3px)}
.load-more-wrap{display:flex;justify-content:center;margin-top:32px}

/* ---------- 对照板块 ---------- */
.compare{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.compare-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r-card);
  padding:28px;box-shadow:var(--shadow-card);
  transition:box-shadow .22s ease-out,transform .22s ease-out;
}
.compare-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-3px)}
.compare-card.alt{background:#F4F9FB;border-color:#D7E6EC}
.compare-card h3{font-size:20px;font-weight:600;color:var(--ink);margin:14px 0 6px}
.compare-card .cap{font-size:14px;color:var(--muted);margin-bottom:18px}
.check-list li{
  display:flex;gap:10px;padding:12px 0;border-top:1px solid var(--line);
  font-size:15px;line-height:1.75;color:var(--text);
}
.check-list li:first-child{border-top:0;padding-top:0}
.check-list .mk{
  flex:none;width:18px;height:18px;border-radius:50%;background:var(--brand-tint);
  color:var(--brand);display:grid;place-items:center;font-size:11px;font-weight:700;margin-top:4px;
}

/* ---------- 流程 ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.step{
  position:relative;padding-top:22px;border-top:2px solid var(--brand-tint);
}
.step::before{
  content:"";position:absolute;top:-2px;left:0;width:44px;height:2px;background:var(--brand);
}
.step-num{
  display:inline-block;font-size:13px;font-weight:700;color:var(--brand);
  letter-spacing:.06em;margin-bottom:10px;
}
.step h3{font-size:17px;font-weight:600;color:var(--ink);margin-bottom:8px}
.step p{font-size:14px;line-height:1.8;color:var(--muted)}

/* ---------- FAQ ---------- */
.faq{background:#fff;border-top:1px solid var(--line)}
.faq-layout{display:grid;grid-template-columns:4fr 8fr;gap:48px;align-items:start}
.faq-side{position:sticky;top:96px}
.faq-side h2{font-size:clamp(24px,3vw,34px);line-height:1.3;font-weight:600;color:var(--ink);margin-bottom:12px}
.faq-side p{font-size:15px;color:var(--muted);margin-bottom:18px}
.text-link{
  display:inline-flex;align-items:center;gap:6px;min-height:44px;
  font-size:15px;font-weight:600;color:var(--brand);
  transition:color .16s ease-out;
}
.text-link .arw{transition:transform .16s ease-out}
.text-link:hover{color:var(--brand-dark)}
.text-link:hover .arw{transform:translateX(3px)}
.faq-item{
  background:#fff;border:1px solid var(--line);border-radius:12px;
  margin-bottom:10px;overflow:hidden;
  transition:border-color .16s ease-out,background-color .16s ease-out,box-shadow .16s ease-out;
}
.faq-item:hover{border-color:#C9D7DE}
.faq-item.open{border:1.5px solid rgba(29,91,121,.4);background:#FBFDFE;box-shadow:var(--shadow-card)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px 20px;text-align:left;font-size:16px;font-weight:600;color:var(--ink);
  min-height:56px;transition:color .16s ease-out;
}
.faq-q:hover{color:var(--brand)}
.faq-icon{
  flex:none;width:22px;height:22px;display:grid;place-items:center;
  color:var(--brand);font-size:20px;line-height:1;
  transition:transform .22s ease-out;
}
.faq-item.open .faq-icon{transform:rotate(45deg)}
.faq-a{display:none;padding:0 20px 20px}
.faq-item.open .faq-a{display:block}
.faq-a p{font-size:15px;line-height:1.8;color:var(--text)}

/* ---------- CTA ---------- */
.cta-band{padding:96px 0}
.cta-card{
  background:#EDF4F7;border-radius:24px;padding:56px 40px;
  display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start;
}
.cta-card h2{font-size:clamp(24px,3vw,32px);line-height:1.32;font-weight:600;color:var(--ink);margin-bottom:12px}
.cta-card .cta-sub{font-size:16px;color:var(--text);margin-bottom:24px;max-width:420px}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px}
.form-card{background:#fff;border:1px solid var(--line);border-radius:var(--r-card);padding:24px;box-shadow:var(--shadow-card)}
.form-row{margin-bottom:16px}
.form-row label{display:block;font-size:14px;font-weight:500;color:var(--ink);margin-bottom:6px}
.form-row input,.form-row textarea{
  width:100%;height:44px;padding:0 14px;border:1px solid #C9D7DE;border-radius:var(--r-btn);
  font-size:15px;font-family:inherit;color:var(--ink);background:#fff;
  transition:border-color .16s ease-out,box-shadow .16s ease-out;
}
.form-row textarea{height:96px;padding:12px 14px;line-height:1.7;resize:vertical}
.form-row input::placeholder,.form-row textarea::placeholder{color:#9AABB3}
.form-row input:focus,.form-row textarea:focus{
  outline:none;border-color:var(--brand);box-shadow:var(--focus-ring);
}
.form-note{font-size:13px;color:var(--muted);margin-top:12px}
.form-msg{
  display:none;margin-top:12px;font-size:14px;padding:10px 14px;border-radius:10px;
  background:var(--brand-tint);color:var(--brand-dark);
}
.form-msg.show{display:block}

/* ---------- 浮动 CTA ---------- */
.float-cta{
  position:fixed;right:28px;bottom:28px;z-index:90;
  display:inline-flex;align-items:center;gap:8px;
  height:48px;padding:0 22px;border-radius:var(--r-pill);
  background:var(--brand);color:#fff;font-size:15px;font-weight:600;
  box-shadow:0 10px 28px rgba(29,91,121,.32);
  transition:transform .2s ease-out,background-color .2s ease-out,opacity .2s ease-out,box-shadow .2s ease-out;
}
.float-cta .arw{transition:transform .2s ease-out}
.float-cta:hover{background:var(--brand-dark);transform:translateY(-2px);box-shadow:0 14px 32px rgba(29,91,121,.36)}
.float-cta:hover .arw{transform:translateX(2px)}
.float-cta:active{transform:translateY(0)}
.js .float-cta{opacity:0;transform:translateY(10px);pointer-events:none}
.js .float-cta.is-visible{opacity:1;transform:translateY(0);pointer-events:auto}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--dark);padding:64px 0 32px;color:rgba(255,255,255,.72)}
.footer-grid{display:grid;grid-template-columns:4fr 2fr 3fr 3fr;gap:40px}
.f-brand{display:inline-flex;align-items:center;gap:10px;margin-bottom:16px}
.f-brand .brand-mark{background:#fff;color:var(--brand)}
.f-brand .brand-text{color:#fff;font-size:17px}
.f-brand:hover .brand-text{color:#DCEBF2}
.site-footer p{font-size:14px;line-height:1.8;color:rgba(255,255,255,.72);margin-bottom:12px}
.f-contact{font-size:13px;color:rgba(255,255,255,.55)}
.f-title{font-size:14px;font-weight:600;color:#fff;margin-bottom:16px}
.f-links{display:flex;flex-direction:column;gap:10px}
.f-links a{
  font-size:14px;color:rgba(255,255,255,.72);
  transition:color .16s ease-out;
  display:inline-flex;align-items:center;min-height:28px;width:fit-content;
}
.f-links a:hover{color:#fff;text-decoration:underline;text-underline-offset:4px}
.f-tags{display:flex;flex-wrap:wrap;gap:8px}
.f-tags span{
  font-size:12px;line-height:1.6;padding:4px 12px;border-radius:var(--r-pill);
  background:rgba(255,255,255,.08);color:rgba(255,255,255,.8);
}
.f-note{font-size:13px;line-height:1.8;color:rgba(255,255,255,.6)}
.footer-bottom{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;
  margin-top:48px;padding-top:24px;border-top:1px solid rgba(255,255,255,.12);
  font-size:13px;color:rgba(255,255,255,.55);
}

/* ---------- 断点 ---------- */
@media (max-width:1279px){
  .list-layout{grid-template-columns:212px 1fr;gap:36px}
  .brand{padding:0 26px}
  .nav-links{gap:20px}
}
@media (max-width:1023px){
  .nav-grid{height:60px;grid-template-columns:1fr auto}
  .nav-links{display:none}
  .nav-burger{display:flex}
  .brand{padding:0;justify-self:start}
  .brand-text{font-size:16px}
  .page-head{padding:28px 0 40px}
  .page-head-grid{grid-template-columns:1fr;gap:28px}
  .page-head figure{max-width:560px}
  .section{padding:72px 0}
  .section-tight{padding:56px 0}
  .cta-band{padding:72px 0}
  .list-layout{grid-template-columns:1fr;gap:24px}
  .side-nav{position:static;top:auto}
  .side-nav ul{
    display:flex;gap:8px;overflow-x:auto;scroll-snap-type:x mandatory;
    padding-bottom:6px;margin-bottom:8px;scrollbar-width:none;
  }
  .side-nav ul::-webkit-scrollbar{display:none}
  .side-nav a{
    white-space:nowrap;border-left:0;border:1px solid var(--line);
    border-radius:var(--r-pill);padding:0 16px;scroll-snap-align:start;
  }
  .side-nav a.active{border-color:var(--brand);background:var(--brand);color:#fff}
  .side-card{display:none}
  .steps{grid-template-columns:1fr 1fr}
  .faq-layout{grid-template-columns:1fr;gap:28px}
  .faq-side{position:static;top:auto}
  .cta-card{grid-template-columns:1fr;gap:32px;padding:40px 28px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
}
@media (max-width:767px){
  .container{padding:0 18px}
  .section{padding:56px 0}
  .section-tight{padding:44px 0}
  .cta-band{padding:56px 0}
  .page-head h1{font-size:clamp(24px,6vw,30px)}
  .page-head .lead{font-size:16px}
  .compare-grid{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  .op-item{grid-template-columns:44px 1fr;gap:14px;padding:20px 0}
  .op-num{width:44px;height:44px;font-size:18px}
  .op-link{grid-column:2;padding-left:0;justify-self:start}
  .op-desc{-webkit-line-clamp:3}
  .float-cta{
    left:0;right:0;bottom:0;height:auto;min-height:56px;border-radius:0;
    padding:8px 18px calc(8px + env(safe-area-inset-bottom));
    justify-content:center;box-shadow:0 -8px 24px rgba(14,42,56,.14);
  }
  .js .float-cta{transform:translateY(100%)}
  .js .float-cta.is-visible{transform:translateY(0)}
  body{padding-bottom:76px}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .site-footer{padding:48px 0 24px}
  .footer-bottom{margin-top:32px}
  .cta-card{padding:32px 20px}
  .form-card{padding:20px}
}
@media (max-width:479px){
  .brand-text{font-size:15px}
  .brand-mark{width:26px;height:26px;font-size:13px}
  .head-tags{gap:6px}
  .btn{padding:0 18px}
  .list-topline{flex-direction:column;align-items:flex-start;gap:6px}
}
@media (prefers-reduced-motion:reduce){
  *{transition-duration:.01ms !important;animation-duration:.01ms !important;scroll-behavior:auto !important}
}