/* roulang page: index */
:root{
  --ink:#0A0918;
  --ink-2:#171431;
  --primary:#6C4CF1;
  --primary-hover:#5A3AE0;
  --primary-active:#4A2ED0;
  --accent:#23E0C4;
  --accent-2:#FF4D9D;
  --bg:#F7F6FC;
  --surface:#FFFFFF;
  --line:#E6E4F2;
  --text:#15132A;
  --muted:#5C5875;
  --text-d:#F4F2FF;
  --muted-d:#A7A2C6;
  --r-card:16px;
  --r-btn:10px;
  --r-input:10px;
  --r-badge:6px;
  --sh-1:0 2px 8px rgba(21,19,42,.05);
  --sh-2:0 12px 28px rgba(108,76,241,.16);
  --edge:rgba(255,255,255,.08);
  --shell:1200px;
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  font-size:16px;
  line-height:1.8;
  color:var(--text);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,p,ul,ol,figure{margin:0;}
ul,ol{padding:0;list-style:none;}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}
button,input,select,textarea{font:inherit;color:inherit;}
button{cursor:pointer;background:none;border:none;}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;}
.num{font-variant-numeric:tabular-nums;font-feature-settings:"tnum";}

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

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:var(--surface);
  border-bottom:1px solid var(--line);
  box-shadow:var(--sh-1);
}
.nav-row{display:flex;align-items:center;gap:20px;height:68px;}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;}
.brand-mark{width:30px;height:30px;flex:none;}
.brand-text{font-size:18px;font-weight:700;letter-spacing:-.01em;line-height:1;color:var(--text);display:flex;align-items:baseline;}
.brand-sub{font-size:12px;font-weight:600;color:var(--primary);margin-left:3px;letter-spacing:0;}
.nav-main{display:flex;align-items:center;gap:4px;margin-left:8px;}
.nav-main a{
  position:relative;display:inline-block;
  padding:8px 12px;font-size:15px;font-weight:500;color:#3A3654;
  border-radius:8px;transition:color .2s ease,background .2s ease;
}
.nav-main a::after{
  content:"";position:absolute;left:12px;right:12px;bottom:2px;height:2px;
  background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform .2s ease;
}
.nav-main a:hover{color:var(--primary);background:#F5F3FF;}
.nav-main a:hover::after{transform:scaleX(1);}
.nav-main a.active{color:var(--text);font-weight:600;}
.nav-main a.active::after{transform:scaleX(1);}
.nav-tools{margin-left:auto;display:flex;align-items:center;gap:12px;}
.search-box{
  display:flex;align-items:center;gap:8px;height:40px;padding:0 16px;
  border:1px solid var(--line);border-radius:999px;background:#FBFBFE;
  transition:border-color .2s ease,box-shadow .2s ease;
}
.search-box svg{flex:none;opacity:.5;}
.search-box input{border:none;background:transparent;outline:none;width:150px;font-size:14px;}
.search-box input::placeholder{color:#9C98B4;}
.search-box:focus-within{border-color:var(--primary);box-shadow:0 0 0 3px rgba(35,224,196,.25);}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 24px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;line-height:1;
  transition:transform .18s ease,background .18s ease,color .18s ease,box-shadow .18s ease,border-color .18s ease;
}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 6px 16px rgba(108,76,241,.24);}
.btn-primary:hover{background:var(--primary-hover);transform:translateY(-1px);box-shadow:0 10px 22px rgba(108,76,241,.3);}
.btn-primary:active{background:var(--primary-active);transform:translateY(1px);box-shadow:none;}
.btn-outline{background:#fff;color:var(--text);border:1px solid var(--line);}
.btn-outline:hover{border-color:var(--primary);color:var(--primary);}
.btn-outline:active{background:#F5F3FF;}
.btn-ghost{background:transparent;color:var(--text-d);border:1px solid rgba(255,255,255,.24);}
.btn-ghost:hover{background:var(--accent);color:var(--ink);border-color:var(--accent);transform:translateY(-1px);}
.btn-ghost:active{background:#1BC4AC;color:var(--ink);transform:translateY(1px);}
.btn-sm{height:40px;padding:0 18px;font-size:14px;}
.burger{display:none;width:42px;height:42px;border-radius:10px;border:1px solid var(--line);align-items:center;justify-content:center;}
.burger span{display:block;width:18px;height:2px;background:var(--text);position:relative;}
.burger span::before,.burger span::after{content:"";position:absolute;left:0;width:18px;height:2px;background:var(--text);}
.burger span::before{top:-6px;}
.burger span::after{top:6px;}
.drawer-mask{position:fixed;inset:0;background:rgba(10,9,24,.6);opacity:0;pointer-events:none;transition:opacity .25s ease;z-index:70;}
.drawer{
  position:fixed;top:0;right:0;bottom:0;width:300px;max-width:86vw;background:#fff;z-index:80;
  transform:translateX(100%);transition:transform .28s ease;padding:22px;overflow-y:auto;
}
.drawer.open{transform:translateX(0);}
.drawer-mask.open{opacity:1;pointer-events:auto;}
.drawer-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px;}
.drawer-close{width:38px;height:38px;border-radius:10px;border:1px solid var(--line);font-size:18px;color:var(--muted);}
.drawer-nav a{display:block;padding:13px 12px;border-radius:10px;font-size:15px;font-weight:500;color:#3A3654;}
.drawer-nav a:hover,.drawer-nav a.active{background:#F5F3FF;color:var(--primary);}
.drawer-foot{margin-top:18px;display:flex;flex-direction:column;gap:12px;}
.drawer-search{height:44px;border:1px solid var(--line);border-radius:999px;padding:0 16px;width:100%;background:#FBFBFE;outline:none;}
.drawer-search:focus{border-color:var(--primary);}

/* ---------- hero ---------- */
.hero{
  position:relative;overflow:hidden;background:var(--ink);color:var(--text-d);
  padding:80px 0 88px;
}
.hero::before{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.06) 1px,transparent 1px);
  background-size:24px 24px;opacity:.55;pointer-events:none;
}
.hero::after{
  content:"";position:absolute;right:-160px;top:-180px;width:620px;height:620px;
  background:radial-gradient(circle at 30% 30%,rgba(108,76,241,.45),transparent 62%);
  pointer-events:none;
}
.hero-grid{position:relative;z-index:2;display:grid;grid-template-columns:1.05fr 1fr;gap:56px;align-items:center;}
.hero-eyebrow{
  display:inline-flex;align-items:center;gap:8px;height:30px;padding:0 12px;border-radius:999px;
  background:rgba(35,224,196,.12);color:var(--accent);font-size:12px;font-weight:600;
  border:1px solid rgba(35,224,196,.28);margin-bottom:20px;
}
.hero h1{font-size:44px;line-height:1.18;font-weight:700;letter-spacing:-.02em;color:var(--text-d);}
.hero-lead{margin-top:16px;font-size:17px;line-height:1.8;color:var(--muted-d);max-width:520px;}
.hero-cta{margin-top:28px;display:flex;flex-wrap:wrap;gap:14px;}
.hero-trust{margin-top:32px;display:flex;flex-wrap:wrap;gap:26px;}
.hero-trust li{display:flex;align-items:center;gap:8px;font-size:14px;color:#CFCBE8;}
.hero-trust svg{flex:none;}
.hero-visual{position:relative;}
.hero-shot{
  position:relative;border-radius:20px;overflow:hidden;border:1px solid var(--edge);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 22px),calc(100% - 22px) 100%,0 100%);
}
.hero-shot img{width:100%;height:auto;aspect-ratio:16/10;object-fit:cover;}
.hero-float{
  position:absolute;left:-18px;bottom:-22px;background:#fff;color:var(--text);
  border-radius:14px;padding:16px 20px;box-shadow:0 16px 34px rgba(10,9,24,.34);
  min-width:186px;
}
.hero-float .v{font-size:32px;font-weight:800;color:var(--primary);line-height:1.1;}
.hero-float .l{font-size:13px;color:var(--muted);margin-top:4px;}

/* ---------- sections ---------- */
.section{padding:96px 0;}
.section-dark{background:var(--ink);color:var(--text-d);position:relative;overflow:hidden;}
.section-dark::before{
  content:"";position:absolute;inset:0;
  background-image:radial-gradient(rgba(255,255,255,.5) 1px,transparent 1px);
  background-size:64px 64px;opacity:.16;pointer-events:none;
}
.section-dark > .shell{position:relative;z-index:2;}
.section-muted{background:#F2F0FB;}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:40px;flex-wrap:wrap;}
.sec-kicker{font-size:13px;font-weight:600;color:var(--primary);letter-spacing:.08em;margin-bottom:10px;display:block;}
.section-dark .sec-kicker{color:var(--accent);}
.sec-title{font-size:30px;line-height:1.3;font-weight:700;letter-spacing:-.01em;}
.sec-desc{margin-top:12px;font-size:16px;color:var(--muted);max-width:640px;}
.section-dark .sec-desc{color:var(--muted-d);}
.link-arrow{display:inline-flex;align-items:center;gap:6px;font-size:15px;font-weight:600;color:var(--primary);}
.link-arrow:hover{color:var(--primary-hover);gap:10px;transition:gap .2s ease;}

/* ---------- metrics ---------- */
.metric-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}
.metric-card{
  border:1px solid var(--edge);border-radius:var(--r-card);padding:24px 22px;background:rgba(255,255,255,.02);
}
.metric-card .bar{width:34px;height:3px;background:var(--accent);border-radius:2px;margin-bottom:18px;}
.metric-num{font-size:44px;font-weight:800;line-height:1.05;color:var(--accent);}
.metric-num small{font-size:16px;font-weight:600;margin-left:4px;color:var(--accent);}
.metric-label{margin-top:10px;font-size:15px;font-weight:600;color:var(--text-d);}
.metric-note{margin-top:6px;font-size:12px;color:var(--muted-d);line-height:1.7;}

/* ---------- bento ---------- */
.bento{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.bento-main{
  grid-column:span 2;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  overflow:hidden;display:grid;grid-template-columns:1.05fr 1fr;transition:transform .28s ease,box-shadow .28s ease,border-color .28s ease;
}
.bento-main:hover{transform:translateY(-3px);box-shadow:var(--sh-2);border-color:rgba(108,76,241,.4);}
.bento-main .txt{padding:32px 30px;display:flex;flex-direction:column;}
.bento-main .txt h3{font-size:20px;line-height:1.5;font-weight:600;margin-bottom:12px;}
.bento-main .txt p{font-size:15px;color:var(--muted);line-height:1.8;}
.bento-main .pic{overflow:hidden;}
.bento-main .pic img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease;}
.bento-main:hover .pic img{transform:scale(1.03);}
.bento-main .points{margin-top:18px;display:flex;flex-direction:column;gap:10px;}
.bento-main .points li{display:flex;gap:9px;font-size:14px;color:#3E3A5C;}
.bento-main .points svg{flex:none;margin-top:5px;}
.bento-main .link-arrow{margin-top:auto;padding-top:20px;}
.bento-small{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);padding:24px 22px;
  display:flex;flex-direction:column;transition:transform .28s ease,box-shadow .28s ease,border-color .28s ease;
}
.bento-small:hover{transform:translateY(-3px);box-shadow:var(--sh-2);border-color:rgba(108,76,241,.4);}
.bento-small .ic{
  width:42px;height:42px;border-radius:12px;background:#F1EEFE;color:var(--primary);
  display:flex;align-items:center;justify-content:center;margin-bottom:16px;
}
.bento-small h3{font-size:17px;line-height:1.6;font-weight:600;margin-bottom:8px;}
.bento-small p{font-size:14.5px;color:var(--muted);line-height:1.8;}

/* ---------- compare ---------- */
.compare{display:grid;grid-template-columns:1fr 92px 1fr;gap:24px;align-items:stretch;}
.compare-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-card);padding:30px 28px;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 20px),calc(100% - 20px) 100%,0 100%);
}
.compare-card h3{font-size:19px;font-weight:600;margin-bottom:18px;}
.compare-card ul{display:flex;flex-direction:column;gap:14px;}
.compare-card li{display:flex;gap:10px;font-size:15px;color:#3E3A5C;line-height:1.75;}
.compare-card li svg{flex:none;margin-top:6px;}
.compare-vs{display:flex;align-items:center;justify-content:center;}
.compare-vs span{
  width:64px;height:64px;border-radius:999px;background:var(--primary);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:800;font-size:16px;letter-spacing:.04em;
}

/* ---------- news ---------- */
.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(--line);border-radius:var(--r-card);
  overflow:hidden;transition:transform .28s ease,box-shadow .28s ease,border-color .28s ease;
}
.news-card:hover{transform:translateY(-3px);box-shadow:var(--sh-2);border-color:rgba(108,76,241,.4);}
.news-thumb{overflow:hidden;aspect-ratio:16/9;}
.news-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease;}
.news-card:hover .news-thumb img{transform:scale(1.03);}
.news-body{padding:20px 20px 22px;display:flex;flex-direction:column;flex:1;}
.badge{
  display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:var(--r-badge);
  background:rgba(35,224,196,.12);color:#0E9C87;font-size:12px;font-weight:600;width:fit-content;
}
.badge-violet{background:#F1EEFE;color:var(--primary);}
.news-body h3{
  margin-top:12px;font-size:17px;line-height:1.6;font-weight:600;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.news-body p{
  margin-top:10px;font-size:14.5px;color:var(--muted);line-height:1.8;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.news-meta{margin-top:16px;padding-top:14px;border-top:1px solid var(--line);display:flex;justify-content:space-between;font-size:13px;color:var(--muted);}
.empty-state{
  border:1px dashed var(--line);border-radius:var(--r-card);background:#fff;
  padding:56px 24px;text-align:center;grid-column:1/-1;
}
.empty-state p{margin-top:14px;font-size:15px;color:var(--muted);}
.empty-state .btn{margin-top:20px;}

/* ---------- faq ---------- */
.faq-wrap{display:grid;grid-template-columns:0.7fr 1.3fr;gap:48px;align-items:start;}
.faq-list{display:flex;flex-direction:column;gap:12px;}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;transition:border-color .2s ease,box-shadow .2s ease;}
.faq-item.open{border-color:rgba(108,76,241,.4);box-shadow:var(--sh-1);}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px 22px;font-size:17px;font-weight:600;text-align:left;color:var(--text);
}
.faq-q:hover{color:var(--primary);}
.faq-q .chev{flex:none;transition:transform .2s ease;color:var(--muted);}
.faq-item.open .chev{transform:rotate(180deg);color:var(--primary);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease;}
.faq-item.open .faq-a{max-height:420px;}
.faq-a-inner{
  padding:0 22px 20px 22px;border-left:2px solid var(--primary);margin-left:22px;
  font-size:15px;color:var(--muted);line-height:1.85;
}
.faq-side-card{background:#fff;border:1px solid var(--line);border-radius:var(--r-card);padding:26px 24px;margin-top:24px;}
.faq-side-card h3{font-size:17px;font-weight:600;margin-bottom:10px;}
.faq-side-card p{font-size:14.5px;color:var(--muted);}

/* ---------- form ---------- */
.form-grid{display:grid;grid-template-columns:0.8fr 1.2fr;gap:56px;align-items:start;}
.form-side h2{font-size:30px;line-height:1.3;font-weight:700;}
.form-side p{margin-top:14px;font-size:16px;color:var(--muted-d);line-height:1.85;max-width:420px;}
.form-side ul{margin-top:24px;display:flex;flex-direction:column;gap:12px;}
.form-side li{display:flex;gap:9px;font-size:14.5px;color:#CFCBE8;}
.form-side li svg{flex:none;margin-top:6px;}
.form-card{background:#fff;border-radius:var(--r-card);padding:32px;box-shadow:0 20px 44px rgba(10,9,24,.28);color:var(--text);}
.field{margin-bottom:18px;}
.field label{display:block;font-size:14px;font-weight:600;margin-bottom:8px;color:#3E3A5C;}
.field input,.field select,.field textarea{
  width:100%;height:48px;padding:0 14px;border:1px solid var(--line);border-radius:var(--r-input);
  background:#FBFBFE;outline:none;transition:border-color .2s ease,box-shadow .2s ease;
}
.field textarea{height:120px;padding:12px 14px;resize:vertical;line-height:1.7;}
.field input:focus,.field select:focus,.field textarea:focus{
  border-color:var(--primary);box-shadow:0 0 0 3px rgba(35,224,196,.3);background:#fff;
}
.field input.err,.field textarea.err{border-color:var(--accent-2);}
.field .hint{font-size:12px;color:var(--accent-2);margin-top:6px;display:none;}
.field.show-hint .hint{display:block;}
.check{display:flex;align-items:flex-start;gap:10px;font-size:13.5px;color:var(--muted);margin:6px 0 20px;}
.check input{width:16px;height:16px;margin-top:5px;flex:none;accent-color:var(--primary);}
.form-card .btn-primary{width:100%;}
.form-msg{display:none;margin-top:14px;font-size:14px;color:#0E9C87;font-weight:600;text-align:center;}
.form-msg.show{display:block;}

/* ---------- footer ---------- */
.site-footer{background:var(--ink);color:var(--muted-d);padding:72px 0 0;position:relative;overflow:hidden;}
.site-footer::before{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:24px 24px;opacity:.4;pointer-events:none;
}
.footer-grid{position:relative;z-index:2;display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;}
.footer-brand .brand-text{color:var(--text-d);}
.footer-brand p{margin-top:16px;font-size:14px;line-height:1.85;color:var(--muted-d);max-width:320px;}
.footer-contact{margin-top:18px;font-size:14px;line-height:2;}
.footer-contact strong{color:var(--text-d);font-weight:600;}
.footer-col h3{font-size:15px;font-weight:600;color:var(--text-d);margin-bottom:16px;}
.footer-col ul{display:flex;flex-direction:column;gap:11px;}
.footer-col a{font-size:14px;color:var(--muted-d);transition:color .2s ease;}
.footer-col a:hover{color:var(--accent);}
.footer-bottom{
  position:relative;z-index:2;margin-top:52px;padding:22px 0;border-top:1px solid var(--edge);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px;color:#8C87AC;
}
.to-top{
  position:fixed;right:24px;bottom:24px;width:46px;height:46px;border-radius:999px;background:var(--primary);color:#fff;
  display:flex;align-items:center;justify-content:center;box-shadow:0 10px 24px rgba(108,76,241,.4);
  opacity:0;pointer-events:none;transition:opacity .25s ease,transform .25s ease;z-index:50;
}
.to-top.show{opacity:1;pointer-events:auto;}
.to-top:hover{transform:translateY(-2px);background:var(--primary-hover);}

/* ---------- responsive ---------- */
@media (max-width:1024px){
  .nav-main,.search-box{display:none;}
  .burger{display:flex;}
  .nav-tools .btn{display:none;}
  .hero{padding:64px 0 72px;}
  .hero-grid{grid-template-columns:1fr;gap:44px;}
  .hero h1{font-size:36px;}
  .hero-lead{max-width:none;}
  .section{padding:72px 0;}
  .metric-grid{grid-template-columns:repeat(2,1fr);}
  .bento{grid-template-columns:repeat(2,1fr);}
  .bento-main{grid-column:span 2;grid-template-columns:1fr;}
  .bento-main .pic{order:-1;aspect-ratio:16/9;}
  .news-grid{grid-template-columns:repeat(2,1fr);}
  .compare{grid-template-columns:1fr;}
  .compare-vs{padding:6px 0;}
  .faq-wrap{grid-template-columns:1fr;gap:28px;}
  .form-grid{grid-template-columns:1fr;gap:36px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
}
@media (max-width:768px){
  .site-header .nav-row{height:60px;}
  .brand-text{font-size:16px;}
  .section{padding:56px 0;}
  .hero h1{font-size:30px;}
  .sec-title{font-size:24px;}
  .metric-grid{grid-template-columns:repeat(2,1fr);gap:16px;}
  .metric-num{font-size:34px;}
  .bento{grid-template-columns:1fr;}
  .bento-main{grid-column:span 1;}
  .news-grid{grid-template-columns:1fr;}
  .form-card{padding:24px 20px;}
  .footer-grid{grid-template-columns:1fr;}
  .hero-float{left:12px;bottom:-18px;padding:12px 16px;min-width:160px;}
  .hero-float .v{font-size:26px;}
}
@media (max-width:520px){
  .hero-cta{flex-direction:column;align-items:stretch;}
  .hero-cta .btn{width:100%;}
  .hero-trust{gap:16px;}
  .compare-card{padding:24px 20px;}
  .faq-q{font-size:16px;padding:16px 18px;}
}

/* roulang page: article */
:root{
  --ink:#0A0918;
  --ink-2:#171431;
  --primary:#6C4CF1;
  --primary-hover:#5A3AE0;
  --primary-active:#4A2ED0;
  --accent:#23E0C4;
  --accent-ink:#0C8474;
  --accent-2:#FF4D9D;
  --bg:#F7F6FC;
  --surface:#FFFFFF;
  --line:#E6E4F2;
  --text:#15132A;
  --text-2:#5C5875;
  --dark-text:#F4F2FF;
  --dark-text-2:#A7A2C6;
  --dark-line:rgba(255,255,255,.08);
  --r-card:16px;
  --r-btn:10px;
  --r-input:10px;
  --r-badge:6px;
  --sh-1:0 2px 8px rgba(21,19,42,.05);
  --sh-2:0 12px 28px rgba(108,76,241,.16);
  --container:1200px;
  --pad:20px;
}
@media (min-width:768px){ :root{ --pad:32px; } }

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
h1,h2,h3,h4{margin:0;line-height:1.32;letter-spacing:-.01em}
p{margin:0}
ul,ol{margin:0}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}

.shell{max-width:var(--container);margin:0 auto;padding-left:var(--pad);padding-right:var(--pad);position:relative;z-index:1}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:#fff;
  border-bottom:1px solid var(--line);
  box-shadow:0 1px 3px rgba(21,19,42,.04);
}
.nav-row{display:flex;align-items:center;gap:20px;height:68px}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none}
.brand-mark{width:30px;height:30px;flex:none}
.brand-text{font-size:17px;font-weight:700;color:var(--text);letter-spacing:-.01em;white-space:nowrap}
.brand-sub{font-size:11px;font-weight:600;color:var(--primary);margin-left:4px;letter-spacing:0}
.nav-main{display:flex;align-items:center;gap:2px;margin-left:6px}
.nav-main a{
  position:relative;padding:8px 12px;border-radius:8px;
  font-size:14.5px;font-weight:500;color:var(--text-2);
  transition:color .2s,background-color .2s;white-space:nowrap;
}
.nav-main a:hover{color:var(--primary);background:rgba(108,76,241,.06)}
.nav-main a.active{color:var(--text);font-weight:600}
.nav-main a.active::after{
  content:"";position:absolute;left:12px;right:12px;bottom:-2px;height:2px;
  background:var(--accent);border-radius:2px;
}
.nav-tools{margin-left:auto;display:flex;align-items:center;gap:12px}
.search-box{
  display:flex;align-items:center;gap:8px;height:40px;padding:0 14px;
  border:1px solid var(--line);border-radius:999px;background:#FAF9FE;color:var(--text-2);
  transition:border-color .2s,box-shadow .2s,background-color .2s;
}
.search-box:focus-within{border-color:var(--primary);background:#fff;box-shadow:0 0 0 3px rgba(35,224,196,.24)}
.search-box input{border:0;outline:0;background:transparent;font-size:13.5px;width:168px}
.search-box input::placeholder{color:#9C98B8}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 24px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;border:1px solid transparent;cursor:pointer;
  transition:transform .2s,background-color .2s,color .2s,border-color .2s,box-shadow .2s;
  white-space:nowrap;
}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 6px 16px rgba(108,76,241,.22)}
.btn-primary:hover{background:var(--primary-hover);transform:translateY(-1px);box-shadow:0 10px 24px rgba(108,76,241,.3)}
.btn-primary:active{background:var(--primary-active);transform:translateY(0);box-shadow:none}
.btn-outline{background:#fff;border-color:var(--line);color:var(--text)}
.btn-outline:hover{border-color:var(--primary);color:var(--primary);transform:translateY(-1px)}
.btn-ghost{background:transparent;border-color:rgba(255,255,255,.24);color:var(--dark-text)}
.btn-ghost:hover{background:var(--accent);border-color:var(--accent);color:var(--ink)}
.btn-sm{height:40px;padding:0 18px;font-size:14px}
.btn-block{width:100%}

/* ---------- Burger / Drawer ---------- */
.burger{
  display:inline-flex;align-items:center;justify-content:center;
  width:40px;height:40px;border:1px solid var(--line);border-radius:10px;background:#fff;cursor:pointer;
  transition:border-color .2s,background-color .2s;
}
.burger:hover{border-color:var(--primary);background:#F7F6FC}
.burger span{position:relative;display:block;width:16px;height:2px;background:var(--text);border-radius:2px}
.burger span::before,.burger span::after{content:"";position:absolute;left:0;width:16px;height:2px;background:var(--text);border-radius:2px}
.burger span::before{top:-5px}
.burger span::after{top:5px}
@media (min-width:1024px){ .burger{display:none} }
@media (max-width:1023px){ .nav-main{display:none} .search-box{display:none} }

.drawer{position:fixed;inset:0;z-index:90;pointer-events:none}
.drawer.open{pointer-events:auto}
.drawer-overlay{position:absolute;inset:0;background:rgba(10,9,24,.6);opacity:0;transition:opacity .25s}
.drawer.open .drawer-overlay{opacity:1}
.drawer-panel{
  position:absolute;top:0;right:0;height:100%;width:min(330px,88vw);
  background:#fff;padding:20px;display:flex;flex-direction:column;gap:18px;
  transform:translateX(100%);transition:transform .28s ease;overflow-y:auto;
}
.drawer.open .drawer-panel{transform:translateX(0)}
.drawer-head{display:flex;align-items:center;justify-content:space-between;gap:12px}
.drawer-close{
  width:36px;height:36px;border-radius:10px;border:1px solid var(--line);background:#fff;
  font-size:20px;line-height:1;color:var(--text-2);cursor:pointer;transition:color .2s,border-color .2s;
}
.drawer-close:hover{color:var(--primary);border-color:var(--primary)}
.drawer-search{width:100%}
.drawer-search input{width:100%;min-width:0}
.drawer-nav{display:grid;gap:4px}
.drawer-nav a{padding:12px 14px;border-radius:10px;font-size:15px;font-weight:500;color:var(--text)}
.drawer-nav a:hover{background:#F2F0FB;color:var(--primary)}
.drawer-nav a.active{background:rgba(108,76,241,.08);color:var(--primary);font-weight:600}

/* ---------- Article hero ---------- */
.article-hero{
  position:relative;background:#fff;border-bottom:1px solid var(--line);
  padding:36px 0 34px;
}
.article-hero::before{
  content:"";position:absolute;inset:0;
  background-image:radial-gradient(rgba(108,76,241,.18) 1px,transparent 1px);
  background-size:30px 30px;opacity:.35;pointer-events:none;
}
@media (min-width:768px){ .article-hero{padding:48px 0 42px} }
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--text-2);margin-bottom:20px}
.crumbs a{color:var(--text-2);transition:color .2s}
.crumbs a:hover{color:var(--primary)}
.crumbs .sep{color:#C9C5DE}
.crumbs .current{max-width:min(460px,52vw);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.badge{
  display:inline-flex;align-items:center;gap:6px;padding:4px 10px;
  background:rgba(35,224,196,.12);color:var(--accent-ink);
  border-radius:var(--r-badge);font-size:12px;font-weight:600;letter-spacing:.02em;
}
.badge-violet{background:rgba(108,76,241,.1);color:var(--primary)}
.article-hero h1{
  font-size:clamp(26px,3.6vw,42px);font-weight:700;letter-spacing:-.02em;
  line-height:1.32;margin:16px 0 14px;max-width:900px;
}
.meta-row{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:13px;color:var(--text-2)}
.meta-row .dot{color:#C9C5DE}
.lead{
  margin:24px 0 0;padding:18px 22px;max-width:840px;
  background:#F2F0FB;border-left:3px solid var(--primary);border-radius:0 12px 12px 0;
  font-size:15.5px;line-height:1.9;color:#3B3760;
}

/* ---------- Article body ---------- */
.article-wrap{padding:48px 0 56px}
@media (min-width:768px){ .article-wrap{padding:64px 0 72px} }
.article-inner{max-width:780px;margin:0 auto}
.article-body{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-card);
  padding:26px 20px;box-shadow:var(--sh-1);
}
@media (min-width:768px){ .article-body{padding:44px 48px} }
.article-body > *:first-child{margin-top:0}
.article-body p{font-size:17px;line-height:1.95;color:#2B2846;margin:0 0 1.2em}
.article-body h1,.article-body h2{
  position:relative;font-size:clamp(21px,2.4vw,25px);font-weight:700;color:var(--text);
  margin:40px 0 16px;padding-left:16px;line-height:1.45;
}
.article-body h1::before,.article-body h2::before{
  content:"";position:absolute;left:0;top:.42em;width:6px;height:20px;
  background:var(--primary);border-radius:3px;
}
.article-body h3{font-size:19px;font-weight:600;color:var(--text);margin:28px 0 12px}
.article-body h4{font-size:17px;font-weight:600;color:var(--text);margin:22px 0 10px}
.article-body ul,.article-body ol{margin:0 0 1.2em;padding-left:1.5em}
.article-body li{font-size:17px;line-height:1.95;color:#2B2846;margin-bottom:.5em}
.article-body ul li::marker{color:var(--primary)}
.article-body ol li::marker{color:var(--primary);font-weight:600}
.article-body strong{color:#1B1836;font-weight:600}
.article-body a{color:var(--primary);font-weight:500;text-decoration:underline;text-underline-offset:3px}
.article-body a:hover{color:var(--primary-hover)}
.article-body blockquote{
  margin:24px 0;padding:18px 22px;background:#F2F0FB;
  border-left:3px solid var(--primary);border-radius:12px;color:#3B3760;
}
.article-body blockquote p:last-child{margin-bottom:0}
.article-body img{border-radius:12px;margin:24px 0;height:auto}
.article-body figure{margin:24px 0}
.article-body figcaption,.article-body .caption{font-size:13px;color:var(--text-2);text-align:center;margin-top:8px}
.article-body table{width:100%;border-collapse:collapse;font-size:14.5px;margin:24px 0}
.article-body th,.article-body td{border:1px solid var(--line);padding:10px 12px;text-align:left}
.article-body th{background:#F2F0FB;font-weight:600}
.article-body code{background:#F2F0FB;padding:2px 6px;border-radius:6px;font-size:14px}
.article-body hr{border:0;border-top:1px solid var(--line);margin:32px 0}

.empty-state{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-card);
  padding:56px 24px;text-align:center;box-shadow:var(--sh-1);
}
.empty-state svg{margin:0 auto 16px}
.empty-state h2{font-size:22px;font-weight:700;margin-bottom:10px}
.empty-state p{font-size:15px;color:var(--text-2);margin-bottom:24px}

/* ---------- Sections ---------- */
.section{padding:0 0 56px}
@media (min-width:768px){ .section{padding:0 0 76px} }
.section-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:14px;margin-bottom:24px}
.section-head h2{font-size:clamp(21px,2.4vw,26px);font-weight:700}
.section-head p{font-size:14px;color:var(--text-2);margin-top:6px}
.section-head .link-more{font-size:14px;font-weight:600;color:var(--primary);display:inline-flex;align-items:center;gap:6px}
.section-head .link-more:hover{color:var(--primary-hover);gap:10px;transition:gap .2s}

/* ---------- Recommend cards ---------- */
.rec-grid{display:grid;gap:24px}
@media (min-width:768px){ .rec-grid{grid-template-columns:repeat(3,1fr)} }
.rec-card{
  display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);
  border-radius:var(--r-card);overflow:hidden;box-shadow:var(--sh-1);
  transition:transform .3s,box-shadow .3s,border-color .3s;
}
.rec-card:hover{transform:translateY(-3px);box-shadow:var(--sh-2);border-color:rgba(108,76,241,.4)}
.rec-thumb{aspect-ratio:16/9;overflow:hidden;background:#EEEBF8}
.rec-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s}
.rec-card:hover .rec-thumb img{transform:scale(1.03)}
.rec-body{padding:18px 20px 22px;display:flex;flex-direction:column;gap:8px;flex:1}
.rec-body h3{font-size:17px;font-weight:600}
.rec-body p{font-size:14px;color:var(--text-2);line-height:1.75}
.rec-more{margin-top:auto;padding-top:8px;font-size:13px;font-weight:600;color:var(--primary);display:inline-flex;align-items:center;gap:6px}

/* ---------- Tips ---------- */
.tips-grid{display:grid;gap:20px}
@media (min-width:768px){ .tips-grid{grid-template-columns:repeat(3,1fr)} }
.tip-card{position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--r-card);padding:26px 24px 24px}
.tip-card::before{content:"";position:absolute;left:24px;top:0;width:38px;height:3px;background:var(--accent);border-radius:0 0 3px 3px}
.tip-num{font-size:13px;font-weight:700;color:var(--accent-ink);letter-spacing:.08em;font-variant-numeric:tabular-nums}
.tip-card h3{font-size:17px;font-weight:600;margin:10px 0 8px}
.tip-card p{font-size:14.5px;line-height:1.85;color:var(--text-2)}

/* ---------- FAQ ---------- */
.faq-list{max-width:860px;display:flex;flex-direction:column;gap:12px}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;transition:border-color .2s,box-shadow .2s}
.faq-item:hover{border-color:rgba(108,76,241,.4)}
.faq-item.open{box-shadow:var(--sh-1);border-color:rgba(108,76,241,.35)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px 22px;background:none;border:0;text-align:left;
  font-size:16.5px;font-weight:600;color:var(--text);cursor:pointer;transition:color .2s;
}
.faq-q:hover{color:var(--primary)}
.faq-icon{
  flex:none;width:24px;height:24px;border-radius:999px;background:#F2F0FB;color:var(--primary);
  display:grid;place-items:center;font-size:15px;line-height:1;transition:transform .2s,background-color .2s;
}
.faq-item.open .faq-icon{transform:rotate(180deg);background:rgba(35,224,196,.16)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease}
.faq-item.open .faq-a{max-height:340px}
.faq-a-inner{position:relative;padding:0 22px 20px 40px}
.faq-a-inner::before{content:"";position:absolute;left:22px;top:2px;bottom:22px;width:2px;background:var(--primary);border-radius:2px}
.faq-a-inner p{font-size:15px;line-height:1.85;color:var(--text-2)}

/* ---------- CTA band ---------- */
.cta-band{
  position:relative;color:var(--dark-text);padding:56px 0;
  background-color:var(--ink);
  background-image:linear-gradient(rgba(10,9,24,.9),rgba(23,20,49,.95)),url('/assets/images/backpic/back-2.webp');
  background-size:cover;background-position:center;overflow:hidden;
}
@media (min-width:768px){ .cta-band{padding:88px 0} }
.cta-band::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:radial-gradient(rgba(255,255,255,.45) 1px,transparent 1px);
  background-size:140px 110px;opacity:.25;
}
.cta-grid{display:grid;gap:32px}
@media (min-width:1024px){ .cta-grid{grid-template-columns:5fr 7fr;gap:56px;align-items:start} }
.cta-band h2{font-size:clamp(22px,2.6vw,30px);font-weight:700;color:#fff;line-height:1.4}
.cta-band .cta-desc{margin-top:14px;font-size:15px;line-height:1.85;color:var(--dark-text-2)}
.cta-points{list-style:none;padding:0;margin:24px 0 0;display:grid;gap:12px}
.cta-points li{display:flex;gap:10px;align-items:flex-start;font-size:14.5px;color:var(--dark-text-2)}
.cta-points li span.mark{
  flex:none;width:18px;height:18px;border-radius:999px;background:rgba(35,224,196,.16);
  color:var(--accent);display:grid;place-items:center;font-size:11px;margin-top:3px;
}
.form-card{background:#fff;border-radius:var(--r-card);padding:26px;display:grid;gap:16px;box-shadow:0 18px 40px rgba(8,6,24,.35)}
@media (min-width:768px){ .form-card{padding:32px} }
.field{display:grid;gap:6px}
.field label{font-size:13.5px;font-weight:600;color:#3B3760}
.input,.select,.textarea{
  width:100%;height:48px;padding:0 14px;border:1px solid var(--line);border-radius:var(--r-input);
  background:#FCFBFF;font-size:15px;color:var(--text);transition:border-color .2s,box-shadow .2s,background-color .2s;
}
.textarea{height:auto;min-height:104px;padding:12px 14px;resize:vertical;line-height:1.7}
.input:focus,.select:focus,.textarea:focus{outline:0;border-color:var(--primary);background:#fff;box-shadow:0 0 0 3px rgba(35,224,196,.3)}
.check-row{display:flex;gap:10px;align-items:flex-start;font-size:13px;color:var(--text-2);line-height:1.7}
.check-row input{margin-top:4px;accent-color:var(--primary)}
.form-note{font-size:13px;color:var(--text-2);min-height:20px}
.form-note.ok{color:var(--accent-ink);font-weight:600}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink);color:var(--dark-text-2);padding:56px 0 24px;position:relative}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:24px 24px;opacity:.7;
}
.footer-grid{display:grid;gap:32px}
@media (min-width:768px){ .footer-grid{grid-template-columns:2fr 1fr 1fr 1fr;gap:40px} }
.footer-brand .brand-text{color:#fff}
.footer-brand p{font-size:14px;line-height:1.85;color:var(--dark-text-2);margin:14px 0 16px;max-width:340px}
.footer-contact{font-size:13px;line-height:2;color:#8D88AC}
.footer-contact strong{color:#C9C5E4;font-weight:600}
.footer-col h3{font-size:14px;font-weight:600;color:#fff;margin-bottom:14px}
.footer-col ul{list-style:none;padding:0;display:grid;gap:10px}
.footer-col a{font-size:13.5px;color:var(--dark-text-2);transition:color .2s}
.footer-col a:hover{color:var(--accent)}
.footer-bottom{
  margin-top:40px;padding-top:20px;border-top:1px solid var(--dark-line);
  display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;
  font-size:13px;color:#8D88AC;
}

/* ---------- To top ---------- */
.to-top{
  position:fixed;right:20px;bottom:24px;width:44px;height:44px;border-radius:999px;
  background:var(--primary);color:#fff;border:0;display:grid;place-items:center;cursor:pointer;
  opacity:0;visibility:hidden;transition:opacity .3s,visibility .3s,background-color .2s,transform .2s;
  z-index:70;box-shadow:0 10px 24px rgba(108,76,241,.35);
}
.to-top.show{opacity:1;visibility:visible}
.to-top:hover{background:var(--primary-hover);transform:translateY(-2px)}

@media (max-width:519px){
  .nav-row{height:60px;gap:12px}
  .brand-text{font-size:16px}
  .search-box input{width:120px}
  .lead{padding:16px 18px}
  .article-body{padding:22px 18px}
  .cta-band{padding:48px 0}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}

/* roulang page: category1 */
:root{
    --ink:#0A0918;
    --ink-2:#171431;
    --primary:#6C4CF1;
    --primary-hover:#5A3AE0;
    --primary-press:#4A2ED0;
    --accent:#23E0C4;
    --accent-ink:#0E8C7B;
    --accent-2:#FF4D9D;
    --bg:#F7F6FC;
    --surface:#FFFFFF;
    --line:#E6E4F2;
    --text:#15132A;
    --muted:#5C5875;
    --on-dark:#F4F2FF;
    --on-dark-muted:#A7A2C6;
    --radius-card:16px;
    --radius-btn:10px;
    --radius-badge:6px;
    --shadow-sm:0 2px 8px rgba(21,19,42,.05);
    --shadow-lift:0 12px 28px rgba(108,76,241,.16);
    --sec-y:56px;
  }
  @media (min-width:768px){ :root{ --sec-y:72px; } }
  @media (min-width:1024px){ :root{ --sec-y:96px; } }

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

  .page{
    margin:0;
    font-family:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
    background:var(--bg);
    color:var(--text);
    line-height:1.8;
    font-size:16px;
    -webkit-font-smoothing:antialiased;
    font-variant-numeric:tabular-nums;
    text-rendering:optimizeLegibility;
  }
  .page img{ display:block; max-width:100%; height:auto; }
  .page a{ color:inherit; text-decoration:none; }
  .page button,.page input,.page select,.page textarea{ font:inherit; color:inherit; }
  .page ul{ margin:0; padding:0; list-style:none; }
  .page p{ margin:0; }

  .page a:focus-visible,
  .page button:focus-visible,
  .page input:focus-visible{
    outline:2px solid var(--accent);
    outline-offset:2px;
    border-radius:6px;
  }

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

  /* ---------- 标题体系 ---------- */
  .h1{
    margin:0;
    font-size:30px;
    line-height:1.28;
    font-weight:700;
    letter-spacing:-.02em;
  }
  @media (min-width:1024px){ .h1{ font-size:44px; line-height:1.18; } }
  .h2{
    margin:0;
    font-size:24px;
    line-height:1.38;
    font-weight:700;
    letter-spacing:-.01em;
  }
  @media (min-width:768px){ .h2{ font-size:30px; line-height:1.32; } }
  .h3{
    margin:0;
    font-size:17px;
    line-height:1.55;
    font-weight:600;
  }
  .body-text{ font-size:16px; line-height:1.8; color:var(--muted); }
  .eyebrow{
    display:inline-flex;
    align-items:center;
    gap:10px;
    font-size:12px;
    font-weight:600;
    letter-spacing:.14em;
    color:var(--primary);
    margin-bottom:14px;
  }
  .eyebrow::before{
    content:"";
    width:22px;
    height:2px;
    background:var(--accent);
    border-radius:2px;
  }

  /* ---------- Header ---------- */
  .site-header{
    position:sticky;
    top:0;
    z-index:50;
    background:#fff;
    border-bottom:1px solid var(--line);
    box-shadow:0 2px 8px rgba(21,19,42,.05);
  }
  .nav-row{
    display:flex;
    align-items:center;
    gap:20px;
    height:68px;
  }
  @media (max-width:767px){ .nav-row{ height:60px; } }

  .brand{
    display:inline-flex;
    align-items:center;
    gap:10px;
    flex:0 0 auto;
    transition:opacity .2s ease;
  }
  .brand:hover{ opacity:.85; }
  .brand-mark{ width:30px; height:30px; flex:0 0 auto; }
  .brand-text{
    font-size:19px;
    font-weight:700;
    letter-spacing:-.01em;
    color:var(--text);
    white-space:nowrap;
  }
  .brand-sub{
    font-size:12px;
    font-weight:600;
    color:var(--primary);
    margin-left:4px;
    letter-spacing:.02em;
  }

  .nav-main{
    display:flex;
    align-items:center;
    gap:22px;
    flex:1 1 auto;
    justify-content:center;
    min-width:0;
  }
  .nav-main a{
    position:relative;
    display:inline-block;
    font-size:15px;
    color:var(--text);
    padding:6px 2px 8px;
    white-space:nowrap;
    transition:color .2s ease;
  }
  .nav-main a::after{
    content:"";
    position:absolute;
    left:0;
    bottom:0;
    height:2px;
    width:0;
    background:var(--accent);
    border-radius:2px;
    transition:width .2s ease;
  }
  .nav-main a:hover{ color:var(--primary); }
  .nav-main a:hover::after{ width:100%; }
  .nav-main a.active{ font-weight:600; }
  .nav-main a.active::after{ width:100%; }

  .nav-tools{
    display:flex;
    align-items:center;
    gap:14px;
    flex:0 0 auto;
  }
  .search-box{
    display:flex;
    align-items:center;
    gap:8px;
    height:40px;
    padding:0 16px;
    border:1px solid var(--line);
    border-radius:999px;
    background:#fff;
    color:var(--muted);
    transition:border-color .2s ease, box-shadow .2s ease;
  }
  .search-box:focus-within{
    border-color:var(--primary);
    box-shadow:0 0 0 2px rgba(35,224,196,.3);
  }
  .search-box input{
    border:0;
    outline:0;
    background:transparent;
    font-size:14px;
    width:176px;
    color:var(--text);
  }
  .search-box input::placeholder{ color:#9A96B4; }

  .btn{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    gap:8px;
    height:48px;
    padding:0 24px;
    border:0;
    border-radius:var(--radius-btn);
    font-size:15px;
    font-weight:600;
    cursor:pointer;
    white-space:nowrap;
    transition:background-color .2s ease, color .2s ease, transform .2s ease, box-shadow .2s ease, border-color .2s ease;
  }
  .btn-sm{ height:40px; padding:0 18px; font-size:14px; }
  .btn-primary{
    background:var(--primary);
    color:#fff;
    box-shadow:0 6px 16px rgba(108,76,241,.22);
  }
  .btn-primary:hover{
    background:var(--primary-hover);
    transform:translateY(-1px);
    box-shadow:0 12px 24px rgba(108,76,241,.3);
  }
  .btn-primary:active{
    background:var(--primary-press);
    transform:translateY(0);
    box-shadow:0 4px 12px rgba(108,76,241,.24);
  }
  .btn-outline{
    background:#fff;
    color:var(--text);
    border:1px solid var(--line);
  }
  .btn-outline:hover{
    border-color:var(--primary);
    color:var(--primary);
    transform:translateY(-1px);
  }
  .btn-outline:active{ transform:translateY(0); }

  .burger{
    display:none;
    width:40px;
    height:40px;
    align-items:center;
    justify-content:center;
    border:1px solid var(--line);
    border-radius:10px;
    background:#fff;
    cursor:pointer;
    transition:border-color .2s ease;
  }
  .burger:hover{ border-color:var(--primary); }
  .burger span{
    position:relative;
    display:block;
    width:16px;
    height:2px;
    background:var(--text);
    border-radius:2px;
  }
  .burger span::before,
  .burger span::after{
    content:"";
    position:absolute;
    left:0;
    width:16px;
    height:2px;
    background:var(--text);
    border-radius:2px;
  }
  .burger span::before{ top:-5px; }
  .burger span::after{ top:5px; }

  @media (max-width:1080px){
    .nav-main{ display:none; }
    .burger{ display:inline-flex; }
  }
  @media (max-width:767px){
    .search-box{ display:none; }
    .nav-tools .btn-sm{ display:none; }
  }

  .scrim{
    position:fixed;
    inset:0;
    background:rgba(10,9,24,.6);
    opacity:0;
    visibility:hidden;
    transition:opacity .25s ease, visibility .25s ease;
    z-index:60;
  }
  .scrim.open{ opacity:1; visibility:visible; }
  .drawer{
    position:fixed;
    top:0;
    right:0;
    height:100%;
    width:min(320px,86vw);
    background:#fff;
    padding:24px 24px 32px;
    overflow-y:auto;
    transform:translateX(100%);
    transition:transform .28s ease;
    z-index:70;
    box-shadow:-12px 0 32px rgba(10,9,24,.18);
  }
  .drawer.open{ transform:translateX(0); }
  .drawer-title{
    font-size:12px;
    font-weight:600;
    letter-spacing:.14em;
    color:var(--muted);
    margin-bottom:12px;
  }
  .drawer a{
    display:block;
    padding:13px 0;
    border-bottom:1px solid var(--line);
    font-size:15px;
    color:var(--text);
    transition:color .2s ease;
  }
  .drawer a:hover{ color:var(--primary); }
  .drawer a.active{ color:var(--primary); font-weight:600; }
  .drawer .btn{ width:100%; margin-top:22px; }

  /* ---------- 分类 Hero ---------- */
  .cat-hero{
    position:relative;
    padding:40px 0 56px;
    background:linear-gradient(180deg,#F7F6FC 0%,#EFEDFB 100%);
    overflow:hidden;
  }
  @media (min-width:1024px){ .cat-hero{ padding:56px 0 72px; } }
  .cat-hero::before{
    content:"";
    position:absolute;
    inset:0;
    background-image:radial-gradient(rgba(108,76,241,.10) 1px, transparent 1px);
    background-size:22px 22px;
    opacity:.5;
    pointer-events:none;
  }
  .cat-hero .shell{ position:relative; z-index:1; }
  .cat-hero-grid{
    display:grid;
    grid-template-columns:1fr;
    gap:36px;
    align-items:center;
  }
  @media (min-width:1024px){
    .cat-hero-grid{ grid-template-columns:5fr 7fr; gap:56px; }
  }
  .crumbs{
    display:flex;
    flex-wrap:wrap;
    gap:8px;
    font-size:13px;
    color:var(--muted);
    margin-bottom:18px;
  }
  .crumbs a{ transition:color .2s ease; }
  .crumbs a:hover{ color:var(--primary); }
  .crumbs .cur{ color:var(--muted); }
  .cat-hero-lead{
    margin-top:18px;
    font-size:17px;
    line-height:1.8;
    color:var(--muted);
    max-width:560px;
  }
  .chips{
    display:flex;
    flex-wrap:wrap;
    gap:10px;
    margin-top:26px;
  }
  .chip{
    display:inline-flex;
    align-items:center;
    gap:6px;
    padding:6px 12px;
    border-radius:var(--radius-badge);
    background:rgba(35,224,196,.12);
    color:var(--accent-ink);
    font-size:12px;
    font-weight:600;
    letter-spacing:.01em;
  }
  .chip-primary{
    background:rgba(108,76,241,.10);
    color:var(--primary-press);
  }
  .cat-hero-media img{
    width:100%;
    aspect-ratio:16/10;
    object-fit:cover;
    border-radius:20px;
    box-shadow:0 18px 40px rgba(21,19,42,.14);
  }

  /* ---------- 通用板块 ---------- */
  .section{ padding:var(--sec-y) 0; }
  .section-alt{ background:#F2F0FB; }
  .section-dark{
    position:relative;
    background:var(--ink);
    color:var(--on-dark);
    overflow:hidden;
  }
  .section-dark::before{
    content:"";
    position:absolute;
    inset:0;
    background-image:
      linear-gradient(rgba(255,255,255,.06) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255,255,255,.06) 1px, transparent 1px);
    background-size:24px 24px;
    opacity:.55;
    pointer-events:none;
  }
  .section-dark .shell{ position:relative; z-index:1; }
  .sec-head{ max-width:720px; margin-bottom:40px; }
  .sec-head .h2{ margin-bottom:14px; }
  .sec-head p{ color:var(--muted); font-size:16px; }
  .section-dark .sec-head p{ color:var(--on-dark-muted); }
  .section-dark .h2{ color:var(--on-dark); }

  /* ---------- 图文交替流 ---------- */
  .flow-row{
    display:grid;
    grid-template-columns:1fr;
    gap:32px;
    align-items:center;
    padding:40px 0;
    border-top:1px solid var(--line);
  }
  .flow-row:first-child{ border-top:0; padding-top:0; }
  @media (min-width:1024px){
    .flow-row{ grid-template-columns:1fr 1fr; gap:56px; padding:56px 0; }
    .flow-row.reverse .flow-media{ order:-1; }
  }
  .flow-media{
    overflow:hidden;
    border-radius:var(--radius-card);
    box-shadow:var(--shadow-sm);
  }
  .flow-media img{
    width:100%;
    aspect-ratio:16/10;
    object-fit:cover;
    transition:transform .3s ease;
  }
  .flow-row:hover .flow-media img{ transform:scale(1.03); }
  .flow-copy .h2{ margin-bottom:16px; }
  .flow-copy p{
    font-size:16px;
    line-height:1.8;
    color:var(--muted);
    margin-bottom:14px;
  }
  .ticks{ display:grid; gap:10px; margin-top:22px; }
  .ticks li{
    position:relative;
    padding-left:26px;
    font-size:15px;
    line-height:1.75;
    color:var(--text);
  }
  .ticks li::before{
    content:"";
    position:absolute;
    left:0;
    top:8px;
    width:14px;
    height:14px;
    border-radius:4px;
    background:rgba(35,224,196,.18);
    border:1px solid rgba(35,224,196,.7);
  }

  /* ---------- 深色核对清单 ---------- */
  .check-grid{
    display:grid;
    grid-template-columns:1fr;
    border-top:1px solid rgba(255,255,255,.12);
  }
  @media (min-width:768px){
    .check-grid{ grid-template-columns:repeat(2,1fr); column-gap:48px; }
  }
  .check-item{
    display:grid;
    grid-template-columns:52px 1fr;
    gap:16px;
    padding:22px 0;
    border-bottom:1px solid rgba(255,255,255,.12);
  }
  .check-num{
    font-size:14px;
    font-weight:700;
    letter-spacing:.06em;
    color:var(--accent);
    padding-top:3px;
  }
  .check-item .h3{ color:var(--on-dark); margin-bottom:6px; }
  .check-item p{ font-size:14px; line-height:1.75; color:var(--on-dark-muted); }
  .dark-note{
    margin-top:28px;
    display:flex;
    flex-wrap:wrap;
    align-items:center;
    gap:16px;
    font-size:14px;
    color:var(--on-dark-muted);
  }
  .btn-ghost{
    background:transparent;
    border:1px solid rgba(255,255,255,.24);
    color:#fff;
  }
  .btn-ghost:hover{
    background:var(--accent);
    border-color:var(--accent);
    color:var(--ink);
    transform:translateY(-1px);
  }
  .btn-ghost:active{ transform:translateY(0); }

  /* ---------- 适用场景 ---------- */
  .scene-grid{
    display:grid;
    grid-template-columns:1fr;
    gap:20px;
  }
  @media (min-width:768px){ .scene-grid{ grid-template-columns:repeat(2,1fr); } }
  .scene-card{
    background:var(--surface);
    border:1px solid var(--line);
    border-radius:var(--radius-card);
    padding:26px;
    transition:transform .3s ease, border-color .3s ease, box-shadow .3s ease;
  }
  .scene-card:hover{
    transform:translateY(-3px);
    border-color:rgba(108,76,241,.4);
    box-shadow:var(--shadow-lift);
  }
  .scene-card .h3{ margin:14px 0 10px; }
  .scene-card p{ font-size:15px; line-height:1.78; color:var(--muted); }
  .scene-tag{
    display:inline-block;
    padding:4px 10px;
    border-radius:var(--radius-badge);
    background:rgba(108,76,241,.10);
    color:var(--primary-press);
    font-size:12px;
    font-weight:600;
  }

  /* ---------- FAQ ---------- */
  .faq-layout{
    display:grid;
    grid-template-columns:1fr;
    gap:32px;
  }
  @media (min-width:1024px){
    .faq-layout{ grid-template-columns:4fr 8fr; gap:56px; }
  }
  .faq-aside p{ margin-top:16px; font-size:15px; line-height:1.8; color:var(--muted); }
  .faq-list{ border-top:1px solid var(--line); }
  .faq-item{ border-bottom:1px solid var(--line); }
  .faq-q{
    width:100%;
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:16px;
    padding:20px 0;
    background:none;
    border:0;
    text-align:left;
    font-size:17px;
    font-weight:600;
    line-height:1.6;
    color:var(--text);
    cursor:pointer;
    transition:color .2s ease;
  }
  .faq-q:hover{ color:var(--primary); }
  .faq-q .ic{
    flex:0 0 auto;
    width:22px;
    height:22px;
    color:var(--primary);
    transition:transform .2s ease;
  }
  .faq-item.open .faq-q .ic{ transform:rotate(180deg); }
  .faq-a{
    max-height:0;
    overflow:hidden;
    transition:max-height .3s ease;
  }
  .faq-a p{
    margin:0 0 20px;
    padding-left:16px;
    border-left:2px solid var(--primary);
    font-size:15px;
    line-height:1.85;
    color:var(--muted);
  }

  /* ---------- CTA 条 ---------- */
  .cta-band{
    position:relative;
    background:linear-gradient(135deg,var(--ink) 0%,var(--ink-2) 100%);
    color:var(--on-dark);
    padding:56px 0;
    overflow:hidden;
  }
  @media (min-width:1024px){ .cta-band{ padding:64px 0; } }
  .cta-band::before{
    content:"";
    position:absolute;
    inset:0;
    background-image:radial-gradient(rgba(255,255,255,.16) 1px, transparent 1px);
    background-size:26px 26px;
    opacity:.4;
    pointer-events:none;
  }
  .cta-band .shell{ position:relative; z-index:1; }
  .cta-inner{
    display:flex;
    flex-direction:column;
    align-items:flex-start;
    gap:24px;
  }
  @media (min-width:1024px){
    .cta-inner{ flex-direction:row; align-items:center; justify-content:space-between; gap:48px; }
  }
  .cta-inner .h2{ color:var(--on-dark); margin-bottom:10px; }
  .cta-sub{ font-size:15px; line-height:1.8; color:var(--on-dark-muted); max-width:640px; }

  /* ---------- Footer ---------- */
  .site-footer{
    background:var(--ink);
    color:var(--on-dark-muted);
    padding:64px 0 28px;
    font-size:14px;
  }
  .footer-grid{
    display:grid;
    grid-template-columns:1fr;
    gap:36px;
  }
  @media (min-width:768px){ .footer-grid{ grid-template-columns:repeat(2,1fr); } }
  @media (min-width:1024px){
    .footer-grid{ grid-template-columns:1.4fr 1fr 1fr 1fr; gap:48px; }
  }
  .footer-brand .brand-text{ color:var(--on-dark); font-size:20px; }
  .footer-brand p{
    margin:14px 0 18px;
    max-width:340px;
    font-size:14px;
    line-height:1.8;
    color:var(--on-dark-muted);
  }
  .footer-contact{
    font-size:13px;
    line-height:1.9;
    color:var(--on-dark-muted);
  }
  .footer-contact strong{ color:var(--on-dark); font-weight:600; }
  .footer-col h3{
    margin:0 0 16px;
    font-size:15px;
    font-weight:600;
    color:var(--on-dark);
  }
  .footer-col ul{ display:grid; gap:10px; }
  .footer-col a{
    font-size:14px;
    color:var(--on-dark-muted);
    transition:color .2s ease;
  }
  .footer-col a:hover{ color:var(--accent); }
  .footer-bottom{
    margin-top:48px;
    padding-top:22px;
    border-top:1px solid rgba(255,255,255,.1);
    display:flex;
    flex-wrap:wrap;
    gap:10px;
    justify-content:space-between;
    font-size:13px;
    color:var(--on-dark-muted);
  }

  .to-top{
    position:fixed;
    right:24px;
    bottom:24px;
    width:46px;
    height:46px;
    display:grid;
    place-items:center;
    border:0;
    border-radius:999px;
    background:var(--primary);
    color:#fff;
    cursor:pointer;
    opacity:0;
    visibility:hidden;
    transform:translateY(8px);
    transition:opacity .25s ease, transform .25s ease, visibility .25s ease, background-color .2s ease;
    box-shadow:0 10px 24px rgba(108,76,241,.32);
    z-index:40;
  }
  .to-top.show{ opacity:1; visibility:visible; transform:translateY(0); }
  .to-top:hover{ background:var(--primary-hover); }

/* roulang page: category3 */
:root{
  --ink:#0A0918;
  --ink-2:#171431;
  --primary:#6C4CF1;
  --primary-h:#5A3AE0;
  --primary-a:#4A2ED0;
  --accent:#23E0C4;
  --accent-2:#FF4D9D;
  --bg:#F7F6FC;
  --surface:#FFFFFF;
  --soft:#F2F0FB;
  --line:#E6E4F2;
  --text:#15132A;
  --text-2:#5C5875;
  --dark-text:#F4F2FF;
  --dark-text-2:#A7A2C6;
  --r-card:16px;
  --r-btn:10px;
  --r-input:10px;
  --r-badge:6px;
  --sh:0 2px 8px rgba(21,19,42,.05);
  --sh-h:0 12px 28px rgba(108,76,241,.16);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
h1,h2,h3,h4,p,ul,ol,figure{margin:0}
ul,ol{padding:0;list-style:none}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.shell{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
@media (min-width:768px){.shell{padding:0 32px}}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:#fff;
  border-bottom:1px solid var(--line);
  box-shadow:0 1px 2px rgba(21,19,42,.04);
}
.nav-row{display:flex;align-items:center;gap:18px;height:68px}
.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.brand-mark{width:30px;height:30px;flex:0 0 auto}
.brand-text{display:flex;align-items:baseline;gap:4px;font-size:18px;font-weight:700;letter-spacing:-.01em;color:var(--text);white-space:nowrap}
.brand-sub{font-size:12px;font-weight:600;color:var(--primary);letter-spacing:.02em}
.nav-main{display:flex;align-items:center;gap:22px;margin-left:10px}
.nav-main a{position:relative;padding:6px 0;font-size:15px;color:var(--text-2);transition:color .2s}
.nav-main a::after{
  content:"";position:absolute;left:0;bottom:0;height:2px;width:100%;
  background:var(--accent);transform:scaleX(0);transform-origin:left;
  transition:transform .2s ease;
}
.nav-main a:hover{color:var(--primary)}
.nav-main a:hover::after{transform:scaleX(1)}
.nav-main a.active{color:var(--text);font-weight:600}
.nav-main a.active::after{transform:scaleX(1)}
.nav-tools{display:flex;align-items:center;gap:12px;margin-left:auto}
.search-box{
  display:flex;align-items:center;gap:8px;height:40px;padding:0 14px;
  border:1px solid var(--line);border-radius:999px;background:#fff;color:var(--text-2);
  transition:border-color .2s,box-shadow .2s;
}
.search-box:focus-within{border-color:var(--primary);box-shadow:0 0 0 3px rgba(108,76,241,.12)}
.search-box input{border:0;outline:0;background:transparent;width:186px;font-size:14px}
.search-box input::placeholder{color:#9C98B4}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 24px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;border:1px solid transparent;cursor:pointer;
  transition:background-color .2s,color .2s,border-color .2s,transform .2s,box-shadow .2s;
}
.btn-sm{height:40px;padding:0 18px;font-size:14px}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 6px 16px rgba(108,76,241,.22)}
.btn-primary:hover{background:var(--primary-h);transform:translateY(-1px);box-shadow:0 10px 22px rgba(108,76,241,.28)}
.btn-primary:active{background:var(--primary-a);transform:translateY(1px)}
.btn-outline{background:#fff;border-color:var(--line);color:var(--text)}
.btn-outline:hover{border-color:var(--primary);color:var(--primary)}
.btn-ghost{background:transparent;border-color:rgba(255,255,255,.24);color:var(--dark-text)}
.btn-ghost:hover{background:var(--accent);border-color:var(--accent);color:var(--ink)}
.burger{
  display:none;width:40px;height:40px;border:1px solid var(--line);border-radius:var(--r-btn);
  background:#fff;align-items:center;justify-content:center;cursor:pointer;
}
.burger span{position:relative;display:block;width:16px;height:2px;background:var(--text)}
.burger span::before,.burger span::after{content:"";position:absolute;left:0;width:16px;height:2px;background:var(--text)}
.burger span::before{top:-5px}
.burger span::after{top:5px}

/* ---------- 移动抽屉 ---------- */
.drawer-mask{
  position:fixed;inset:0;z-index:70;background:rgba(10,9,24,.6);
  opacity:0;visibility:hidden;transition:opacity .25s,visibility .25s;
}
.drawer{
  position:fixed;top:0;right:0;z-index:80;height:100%;width:84%;max-width:340px;
  background:#fff;padding:20px;overflow-y:auto;
  transform:translateX(100%);transition:transform .28s ease;
}
body.drawer-open .drawer{transform:translateX(0)}
body.drawer-open .drawer-mask{opacity:1;visibility:visible}
.drawer-top{display:flex;align-items:center;justify-content:space-between;gap:12px}
.drawer-close{
  width:40px;height:40px;border:1px solid var(--line);border-radius:var(--r-btn);
  background:#fff;cursor:pointer;font-size:18px;line-height:1;color:var(--text-2);
}
.drawer-nav{display:flex;flex-direction:column;margin-top:18px}
.drawer-nav a{padding:13px 2px;border-bottom:1px solid var(--line);font-size:15px;color:var(--text-2)}
.drawer-nav a.active{color:var(--primary);font-weight:600}
.drawer-cta{margin-top:22px;display:flex;flex-direction:column;gap:12px}

/* ---------- 通用板块 ---------- */
.section{padding:96px 0}
.section-head{margin-bottom:40px}
.section-head h2{font-size:30px;line-height:1.32;font-weight:700;letter-spacing:-.01em;margin:0 0 12px}
.section-head p{color:var(--text-2);max-width:62em}
.eyebrow{display:inline-block;margin-bottom:12px;font-size:12px;font-weight:700;letter-spacing:.14em;color:var(--primary)}
.dark-section{position:relative;background:var(--ink);color:var(--dark-text);overflow:hidden}
.dark-section::before{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;
  background-image:linear-gradient(rgba(255,255,255,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.06) 1px,transparent 1px);
  background-size:24px 24px;
}
.dark-section::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.3;
  background-image:radial-gradient(circle,rgba(255,255,255,.4) 1px,transparent 1.4px);
  background-size:120px 120px;
}
.dark-section .shell{position:relative;z-index:1}
.dark-section .eyebrow{color:var(--accent)}
.dark-section .section-head p{color:var(--dark-text-2)}
.soft-section{background:var(--soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}

/* ---------- 分类 Hero ---------- */
.cat-hero{
  background:linear-gradient(180deg,#FFFFFF 0%,var(--bg) 100%);
  border-bottom:1px solid var(--line);
  padding:30px 0 52px;
}
.crumb{display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-size:13px;color:var(--text-2);margin-bottom:20px}
.crumb a{transition:color .2s}
.crumb a:hover{color:var(--primary)}
.crumb .sep{color:#C3BFD8}
.cat-hero-grid{display:grid;grid-template-columns:5fr 7fr;gap:44px;align-items:center}
.cat-hero h1{font-size:44px;line-height:1.18;font-weight:700;letter-spacing:-.02em;margin:0 0 16px}
.hero-lead{font-size:17px;color:var(--text-2);max-width:46em;margin:0 0 22px}
.badge-row{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:26px}
.badge{
  display:inline-flex;align-items:center;height:26px;padding:0 10px;border-radius:var(--r-badge);
  background:rgba(108,76,241,.1);color:var(--primary);font-size:12px;font-weight:600;
}
.badge-cyan{background:rgba(35,224,196,.16);color:#0C8574}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px}
.cat-hero-media img{width:100%;aspect-ratio:16/10;object-fit:cover;border-radius:20px;box-shadow:0 18px 40px rgba(21,19,42,.12)}

/* ---------- 指标看板 ---------- */
.metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.metric-card{
  position:relative;padding:30px 24px 26px;border-radius:var(--r-card);
  border:1px solid rgba(255,255,255,.12);background:rgba(255,255,255,.03);
}
.metric-card::before{content:"";position:absolute;top:0;left:24px;width:40px;height:3px;border-radius:2px;background:var(--accent)}
.metric-value{
  font-size:52px;line-height:1.05;font-weight:800;letter-spacing:-.02em;color:var(--accent);
  font-variant-numeric:tabular-nums;display:flex;align-items:baseline;gap:6px;
}
.metric-value span{font-size:17px;font-weight:600;color:var(--dark-text-2)}
.metric-card h3{margin:16px 0 8px;font-size:17px;font-weight:600;color:#fff}
.metric-card p{font-size:13px;line-height:1.75;color:var(--dark-text-2)}

/* ---------- 卡片矩阵 ---------- */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.data-card{
  display:flex;flex-direction:column;overflow:hidden;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  box-shadow:var(--sh);transition:transform .3s,box-shadow .3s,border-color .3s;
}
.data-card:hover{transform:translateY(-3px);box-shadow:var(--sh-h);border-color:rgba(108,76,241,.4)}
.data-card-media{position:relative;overflow:hidden;aspect-ratio:16/9;background:#EFEDF8}
.data-card-media img{width:100%;height:100%;object-fit:cover;transition:transform .3s}
.data-card:hover .data-card-media img{transform:scale(1.03)}
.card-tag{
  position:absolute;top:12px;left:12px;padding:3px 8px;border-radius:var(--r-badge);
  background:rgba(10,9,24,.72);color:#fff;font-size:12px;font-weight:600;
}
.data-card-body{padding:20px 20px 24px;display:flex;flex-direction:column;flex:1}
.data-card-body h3{font-size:17px;line-height:1.5;font-weight:600;margin:0 0 10px}
.data-card-body p{font-size:14px;color:var(--text-2);line-height:1.8}
.card-meta{margin-top:16px;padding-top:14px;border-top:1px dashed var(--line);font-size:13px;font-weight:600;color:var(--primary)}

/* ---------- 字段清单 ---------- */
.split{display:grid;grid-template-columns:4fr 8fr;gap:44px;align-items:start}
.field-list{display:flex;flex-direction:column;gap:12px}
.field-row{
  display:flex;gap:18px;align-items:flex-start;padding:16px 18px;
  background:#fff;border:1px solid var(--line);border-radius:12px;transition:border-color .2s,box-shadow .2s;
}
.field-row:hover{border-color:rgba(108,76,241,.4);box-shadow:var(--sh)}
.field-row .k{flex:0 0 140px;font-size:15px;font-weight:600}
.field-row .v{font-size:14px;color:var(--text-2)}
.update-line{margin-top:22px;font-size:13px;color:var(--text-2)}
.update-line time{font-weight:600;color:var(--primary);font-variant-numeric:tabular-nums}

/* ---------- 问答卡片 ---------- */
.qa-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.qa-card{padding:26px;background:#fff;border:1px solid var(--line);border-radius:var(--r-card);box-shadow:var(--sh)}
.qa-card h3{font-size:17px;font-weight:600;margin:0 0 10px;padding-left:14px;position:relative}
.qa-card h3::before{content:"";position:absolute;left:0;top:.42em;width:4px;height:1.05em;border-radius:2px;background:var(--primary)}
.qa-card p{font-size:14.5px;color:var(--text-2)}

/* ---------- 页尾 CTA ---------- */
.cta-band{position:relative;background:var(--ink-2);color:var(--dark-text);padding:56px 0;overflow:hidden}
.cta-band::before{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.35;
  background-image:radial-gradient(circle,rgba(255,255,255,.35) 1px,transparent 1.4px);
  background-size:110px 110px;
}
.cta-band .shell{position:relative;z-index:1}
.cta-band-inner{display:flex;align-items:center;justify-content:space-between;gap:28px;flex-wrap:wrap}
.cta-band h2{font-size:26px;line-height:1.35;font-weight:700;margin:0 0 8px}
.cta-band p{font-size:15px;color:var(--dark-text-2)}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--ink);color:var(--dark-text-2);padding:64px 0 28px;font-size:14px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:32px}
.footer-brand .brand-text{color:#fff;font-size:17px}
.footer-brand p{margin:14px 0 18px;font-size:14px;line-height:1.85}
.footer-contact{font-size:13px;line-height:1.95}
.footer-contact strong{color:#fff;font-weight:600}
.footer-col h3{margin:0 0 14px;font-size:14px;font-weight:600;color:#fff}
.footer-col ul{display:flex;flex-direction:column;gap:10px}
.footer-col a{font-size:14px;color:var(--dark-text-2);transition:color .2s}
.footer-col a:hover{color:var(--accent)}
.footer-bottom{
  margin-top:44px;padding-top:20px;border-top:1px solid rgba(255,255,255,.1);
  display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:13px;
}

/* ---------- 返回顶部 ---------- */
.to-top{
  position:fixed;right:20px;bottom:24px;z-index:50;width:44px;height:44px;
  display:flex;align-items:center;justify-content:center;border:0;cursor:pointer;
  border-radius:999px;background:var(--primary);color:#fff;
  box-shadow:0 10px 24px rgba(108,76,241,.32);
  opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity .25s,visibility .25s,transform .25s,background-color .2s;
}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{background:var(--primary-h)}

/* ---------- 响应式 ---------- */
@media (max-width:1199px){
  .search-box{display:none}
}
@media (max-width:1023px){
  .nav-main{display:none}
  .burger{display:inline-flex}
  .cat-hero{padding:24px 0 40px}
  .cat-hero-grid{grid-template-columns:1fr;gap:28px}
  .cat-hero h1{font-size:34px;line-height:1.24}
  .section{padding:72px 0}
  .metrics{grid-template-columns:repeat(2,1fr)}
  .card-grid{grid-template-columns:repeat(2,1fr)}
  .split{grid-template-columns:1fr;gap:28px}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:639px){
  .nav-row{height:60px}
  .btn-sm{display:none}
  .cat-hero h1{font-size:30px;line-height:1.28}
  .hero-lead{font-size:16px}
  .section{padding:56px 0}
  .section-head h2{font-size:24px}
  .metrics{grid-template-columns:1fr}
  .metric-value{font-size:44px}
  .card-grid{grid-template-columns:1fr}
  .qa-grid{grid-template-columns:1fr}
  .field-row{flex-direction:column;gap:6px}
  .field-row .k{flex:none}
  .footer-grid{grid-template-columns:1fr}
  .cta-band h2{font-size:22px}
  .cta-actions{width:100%}
  .cta-actions .btn{width:100%}
}

/* roulang page: category2 */
:root{
  --ink:#0A0918;
  --ink-2:#171431;
  --primary:#6C4CF1;
  --primary-hover:#5A3AE0;
  --primary-deep:#4A2ED0;
  --accent:#23E0C4;
  --accent-2:#FF4D9D;
  --bg:#F7F6FC;
  --bg-2:#F2F0FB;
  --surface:#FFFFFF;
  --line:#E6E4F2;
  --text:#15132A;
  --muted:#5C5875;
  --dark-text:#F4F2FF;
  --dark-muted:#A7A2C6;
  --shadow-card:0 2px 8px rgba(21,19,42,.05);
  --shadow-hover:0 12px 28px rgba(108,76,241,.16);
  --radius-card:16px;
  --radius-btn:10px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:'PingFang SC','HarmonyOS Sans SC','Microsoft YaHei',system-ui,-apple-system,sans-serif;
  font-size:16px;
  line-height:1.8;
  color:var(--text);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
h1,h2,h3,h4,p,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:2px;
  border-radius:6px;
}
.shell{max-width:1200px;margin:0 auto;padding:0 20px}
@media (min-width:768px){.shell{padding:0 32px}}
.section{padding:96px 0}
@media (max-width:1023px){.section{padding:72px 0}}
@media (max-width:767px){.section{padding:56px 0}}
.section-soft{background:var(--bg-2)}
.section-dark{
  background:var(--ink);
  color:var(--dark-text);
  position:relative;
  overflow:hidden;
}
.section-dark::before{
  content:"";
  position:absolute;inset:0;
  background-image:
    linear-gradient(rgba(255,255,255,.06) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.06) 1px,transparent 1px);
  background-size:24px 24px;
  opacity:.5;
  pointer-events:none;
}
.section-dark::after{
  content:"";
  position:absolute;inset:0;
  background-image:radial-gradient(circle,rgba(244,242,255,.5) 1px,transparent 1px);
  background-size:120px 120px;
  opacity:.35;
  pointer-events:none;
}
.section-dark > *{position:relative;z-index:1}

/* ===== 头部导航 ===== */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:#fff;
  border-bottom:1px solid var(--line);
  box-shadow:0 2px 8px rgba(21,19,42,.05);
}
.nav-row{display:flex;align-items:center;gap:20px;height:68px}
.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.brand-mark{width:30px;height:30px;flex:0 0 auto}
.brand-text{
  display:inline-flex;
  align-items:baseline;
  gap:5px;
  font-size:19px;
  font-weight:700;
  letter-spacing:-.01em;
  color:var(--text);
  white-space:nowrap;
}
.brand-sub{
  font-size:12px;
  font-weight:600;
  color:var(--primary);
  background:rgba(108,76,241,.1);
  padding:2px 7px;
  border-radius:6px;
  line-height:1.4;
}
.nav-main{display:flex;align-items:center;gap:2px;margin-left:auto}
.nav-main a{
  position:relative;
  padding:8px 12px;
  border-radius:8px;
  font-size:14.5px;
  color:var(--muted);
  transition:color .2s ease,background .2s ease;
}
.nav-main a::after{
  content:"";
  position:absolute;
  left:12px;right:12px;bottom:0;
  height:2px;
  background:var(--accent);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .2s ease;
  border-radius:2px;
}
.nav-main a:hover{color:var(--primary);background:rgba(108,76,241,.06)}
.nav-main a:hover::after{transform:scaleX(1)}
.nav-main a.active{color:var(--text);font-weight:600}
.nav-main a.active::after{transform:scaleX(1)}
.nav-tools{display:flex;align-items:center;gap:12px;flex:0 0 auto}
.search-box{
  display:flex;
  align-items:center;
  gap:8px;
  height:40px;
  padding:0 16px;
  border:1px solid var(--line);
  border-radius:999px;
  background:var(--bg);
  color:var(--muted);
  transition:border-color .2s ease,box-shadow .2s ease;
}
.search-box:focus-within{border-color:var(--primary);box-shadow:0 0 0 3px rgba(35,224,196,.25)}
.search-box input{
  border:0;
  background:transparent;
  outline:none;
  width:180px;
  font-size:14px;
}
.search-box input::placeholder{color:#9A96B4}
.burger{
  display:none;
  width:42px;height:42px;
  border:1px solid var(--line);
  border-radius:10px;
  background:#fff;
  cursor:pointer;
  position:relative;
  transition:border-color .2s ease;
}
.burger:hover{border-color:var(--primary)}
.burger span,
.burger span::before,
.burger span::after{
  position:absolute;
  left:50%;
  width:18px;height:2px;
  background:var(--text);
  border-radius:2px;
  transform:translateX(-50%);
  transition:transform .2s ease;
}
.burger span{top:50%;margin-top:-1px}
.burger span::before{content:"";top:-6px;left:0;transform:none}
.burger span::after{content:"";top:6px;left:0;transform:none}

/* ===== 按钮 ===== */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:48px;
  padding:0 24px;
  border:1px solid transparent;
  border-radius:var(--radius-btn);
  font-size:15px;
  font-weight:600;
  cursor:pointer;
  white-space:nowrap;
  transition:background .2s ease,color .2s ease,border-color .2s ease,transform .2s ease,box-shadow .2s ease;
}
.btn-sm{height:40px;padding:0 18px;font-size:14px}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-hover);transform:translateY(-1px);box-shadow:0 10px 22px rgba(108,76,241,.3)}
.btn-primary:active{background:var(--primary-deep);transform:translateY(1px);box-shadow:none}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--text)}
.btn-ghost:hover{border-color:var(--primary);color:var(--primary)}
.btn-ghost:active{background:rgba(108,76,241,.06)}
.btn-dark-ghost{background:transparent;border-color:rgba(255,255,255,.24);color:var(--dark-text)}
.btn-dark-ghost:hover{background:var(--accent);border-color:var(--accent);color:var(--ink)}
.btn-dark-ghost:active{transform:translateY(1px)}

/* ===== 徽章 / 面包屑 / 标签 ===== */
.badge{
  display:inline-flex;
  align-items:center;
  height:26px;
  padding:0 10px;
  border-radius:6px;
  font-size:12px;
  font-weight:600;
  background:rgba(35,224,196,.14);
  color:#0E8C7C;
}
.badge-primary{background:rgba(108,76,241,.1);color:#5A3AE0}
.badge-pink{background:rgba(255,77,157,.12);color:#C42A73}
.badge-row{display:flex;flex-wrap:wrap;gap:10px}
.crumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--muted)}
.crumb a:hover{color:var(--primary)}
.crumb .sep{color:#B9B5CE}
.crumb .current{color:var(--muted)}

/* ===== Hero ===== */
.page-hero{padding:56px 0 64px;background:var(--bg)}
@media (max-width:767px){.page-hero{padding:36px 0 48px}}
.hero-grid{
  display:grid;
  grid-template-columns:5fr 7fr;
  gap:48px;
  align-items:center;
  margin-top:28px;
}
@media (max-width:1023px){
  .hero-grid{grid-template-columns:1fr;gap:32px}
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:13px;
  font-weight:600;
  color:var(--primary);
  letter-spacing:.02em;
  margin-bottom:14px;
}
.eyebrow::before{
  content:"";
  width:20px;height:2px;
  background:var(--primary);
  border-radius:2px;
}
h1{
  font-size:44px;
  line-height:1.18;
  font-weight:700;
  letter-spacing:-.02em;
  color:var(--text);
}
@media (max-width:767px){h1{font-size:30px;line-height:1.26}}
.hero-lead{
  margin-top:18px;
  font-size:16.5px;
  line-height:1.85;
  color:var(--muted);
  max-width:34em;
}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px}
.hero-figure{position:relative}
.hero-figure img{
  width:100%;
  height:auto;
  border-radius:20px;
  box-shadow:0 18px 40px rgba(21,19,42,.14);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 26px),calc(100% - 26px) 100%,0 100%);
}
.hero-float{
  position:absolute;
  left:-18px;
  bottom:26px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:14px;
  padding:14px 18px;
  box-shadow:0 12px 28px rgba(21,19,42,.12);
  min-width:150px;
}
.hero-float strong{
  display:block;
  font-size:30px;
  font-weight:800;
  color:var(--accent);
  font-variant-numeric:tabular-nums;
  line-height:1.2;
}
.hero-float span{font-size:12.5px;color:var(--muted)}
@media (max-width:639px){
  .hero-float{left:12px;bottom:12px;padding:10px 14px}
  .hero-float strong{font-size:24px}
}

/* ===== 通用标题 ===== */
.h2{
  font-size:30px;
  line-height:1.3;
  font-weight:700;
  letter-spacing:-.01em;
  color:var(--text);
}
@media (max-width:767px){.h2{font-size:23px}}
.h3{font-size:17px;line-height:1.5;font-weight:600;color:var(--text)}
.section-lead{
  margin-top:14px;
  font-size:16px;
  color:var(--muted);
  max-width:46em;
}
.section-head{max-width:760px}
.section-dark .h2,.section-dark .h3{color:var(--dark-text)}
.section-dark .section-lead{color:var(--dark-muted)}

/* ===== 适用场景（图文） ===== */
.fit-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:48px;
  align-items:center;
  margin-top:44px;
}
@media (max-width:1023px){.fit-grid{grid-template-columns:1fr;gap:32px}}
.fit-figure img{
  border-radius:var(--radius-card);
  border:1px solid var(--line);
  box-shadow:var(--shadow-card);
  width:100%;
}
.check-list{margin-top:26px;display:grid;gap:16px}
.check-list li{
  display:flex;
  gap:12px;
  align-items:flex-start;
  font-size:15.5px;
  color:var(--muted);
  line-height:1.8;
}
.check-list li strong{color:var(--text);font-weight:600}
.check-dot{
  flex:0 0 auto;
  width:22px;height:22px;
  margin-top:5px;
  border-radius:999px;
  background:rgba(108,76,241,.12);
  color:var(--primary);
  display:grid;
  place-items:center;
  font-size:12px;
  font-weight:700;
}

/* ===== 时间线 / 步骤条 ===== */
.timeline{margin-top:48px;position:relative}
.tl-item{position:relative;padding-left:76px;padding-bottom:26px}
.tl-item:last-child{padding-bottom:0}
.tl-item::before{
  content:"";
  position:absolute;
  left:23px;
  top:56px;
  bottom:0;
  width:2px;
  background:linear-gradient(180deg,rgba(108,76,241,.5),rgba(35,224,196,.28));
}
.tl-item:last-child::before{display:none}
.tl-num{
  position:absolute;
  left:0;top:0;
  width:48px;height:48px;
  border-radius:999px;
  background:#fff;
  border:2px solid rgba(108,76,241,.28);
  display:grid;
  place-items:center;
  font-size:15px;
  font-weight:700;
  color:var(--primary);
  font-variant-numeric:tabular-nums;
  z-index:1;
}
.tl-card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  padding:24px 26px;
  box-shadow:var(--shadow-card);
  transition:transform .3s ease,box-shadow .3s ease,border-color .3s ease;
}
.tl-card:hover{
  transform:translateY(-3px);
  border-color:rgba(108,76,241,.4);
  box-shadow:var(--shadow-hover);
}
.tl-card p{
  margin-top:10px;
  font-size:15px;
  color:var(--muted);
  line-height:1.85;
}
.tl-meta{
  margin-top:14px;
  display:flex;
  flex-wrap:wrap;
  gap:8px;
}
.tl-note{
  font-size:12.5px;
  color:var(--muted);
  background:var(--bg-2);
  border-radius:6px;
  padding:4px 10px;
}
@media (max-width:767px){
  .tl-item{padding-left:58px}
  .tl-num{width:40px;height:40px;font-size:14px}
  .tl-item::before{left:19px;top:46px}
  .tl-card{padding:20px}
}

/* ===== 问题速查卡片 ===== */
.quick-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:24px;
  margin-top:44px;
}
@media (max-width:1023px){.quick-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:639px){.quick-grid{grid-template-columns:1fr}}
.quick-card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  padding:26px;
  box-shadow:var(--shadow-card);
  transition:transform .3s ease,box-shadow .3s ease,border-color .3s ease;
  display:flex;
  flex-direction:column;
}
.quick-card:hover{
  transform:translateY(-3px);
  border-color:rgba(108,76,241,.4);
  box-shadow:var(--shadow-hover);
}
.quick-icon{
  width:40px;height:40px;
  border-radius:10px;
  background:rgba(35,224,196,.14);
  color:#0E8C7C;
  display:grid;
  place-items:center;
  margin-bottom:16px;
}
.quick-card p{
  margin-top:10px;
  font-size:14.5px;
  color:var(--muted);
  line-height:1.8;
}
.quick-card .quick-link{
  margin-top:18px;
  font-size:13.5px;
  font-weight:600;
  color:var(--primary);
  display:inline-flex;
  align-items:center;
  gap:6px;
}
.quick-card .quick-link:hover{color:var(--primary-hover)}

/* ===== 安全提示 ===== */
.safe-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:24px;
  margin-top:44px;
}
@media (max-width:767px){.safe-grid{grid-template-columns:1fr}}
.safe-card{
  background:#fff;
  border:1px solid var(--line);
  border-left:3px solid var(--primary);
  border-radius:12px;
  padding:22px 24px;
}
.safe-card p{margin-top:8px;font-size:14.5px;color:var(--muted);line-height:1.8}

/* ===== FAQ ===== */
.faq-grid{
  display:grid;
  grid-template-columns:4fr 8fr;
  gap:48px;
  align-items:start;
}
@media (max-width:1023px){.faq-grid{grid-template-columns:1fr;gap:28px}}
.faq-list{margin-top:0;border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  padding:20px 0;
  background:transparent;
  border:0;
  text-align:left;
  font-size:17px;
  font-weight:600;
  color:var(--text);
  cursor:pointer;
  transition:color .2s ease;
}
.faq-q:hover{color:var(--primary)}
.faq-q .chev{
  flex:0 0 auto;
  width:22px;height:22px;
  color:var(--primary);
  transition:transform .2s ease;
}
.faq-item.open .faq-q .chev{transform:rotate(180deg)}
.faq-a{
  max-height:0;
  overflow:hidden;
  transition:max-height .3s ease;
}
.faq-item.open .faq-a{max-height:360px}
.faq-a-inner{
  border-left:2px solid var(--primary);
  padding:2px 0 20px 16px;
  font-size:15px;
  color:var(--muted);
  line-height:1.85;
}

/* ===== 页尾 CTA ===== */
.cta-band{
  padding:72px 0;
  background:var(--ink);
  color:var(--dark-text);
  position:relative;
  overflow:hidden;
}
.cta-band::before{
  content:"";
  position:absolute;inset:0;
  background-image:radial-gradient(circle,rgba(244,242,255,.45) 1px,transparent 1px);
  background-size:110px 110px;
  opacity:.3;
  pointer-events:none;
}
.cta-inner{
  position:relative;
  z-index:1;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:32px;
  flex-wrap:wrap;
}
.cta-inner .h2{color:var(--dark-text);max-width:22em}
.cta-actions{display:flex;gap:14px;flex-wrap:wrap}

/* ===== 页脚 ===== */
.site-footer{
  background:var(--ink);
  color:var(--dark-muted);
  padding:72px 0 32px;
  position:relative;
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;inset:0;
  background-image:
    linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:24px 24px;
  opacity:.4;
  pointer-events:none;
}
.site-footer .shell{position:relative;z-index:1}
.footer-grid{
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr 1fr;
  gap:40px;
}
@media (max-width:1023px){.footer-grid{grid-template-columns:1fr 1fr;gap:32px}}
@media (max-width:639px){.footer-grid{grid-template-columns:1fr}}
.footer-brand .brand-text{color:var(--dark-text);margin-bottom:16px;display:inline-flex}
.footer-brand p{font-size:14px;line-height:1.85;color:var(--dark-muted);max-width:30em}
.footer-contact{margin-top:20px;font-size:13.5px;line-height:2;color:var(--dark-muted)}
.footer-contact strong{color:var(--dark-text);font-weight:600}
.footer-col h3{
  font-size:15px;
  font-weight:600;
  color:var(--dark-text);
  margin-bottom:16px;
}
.footer-col ul{display:grid;gap:10px}
.footer-col a{font-size:14px;color:var(--dark-muted);transition:color .2s ease}
.footer-col a:hover{color:var(--accent)}
.footer-bottom{
  margin-top:48px;
  padding-top:22px;
  border-top:1px solid rgba(255,255,255,.1);
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:10px;
  font-size:13px;
  color:#8C87AA;
}

/* ===== 抽屉导航 ===== */
.drawer-mask{
  position:fixed;
  inset:0;
  background:rgba(10,9,24,.6);
  opacity:0;
  pointer-events:none;
  transition:opacity .25s ease;
  z-index:70;
}
.drawer-mask.open{opacity:1;pointer-events:auto}
.drawer{
  position:fixed;
  top:0;right:0;
  width:min(340px,86vw);
  height:100%;
  background:#fff;
  z-index:80;
  transform:translateX(100%);
  transition:transform .28s ease;
  display:flex;
  flex-direction:column;
  gap:20px;
  padding:22px 22px 28px;
  overflow-y:auto;
}
.drawer.open{transform:translateX(0)}
.drawer-head{display:flex;align-items:center;justify-content:space-between}
.drawer-close{
  width:38px;height:38px;
  border:1px solid var(--line);
  border-radius:10px;
  background:#fff;
  font-size:20px;
  line-height:1;
  color:var(--muted);
  cursor:pointer;
  transition:border-color .2s ease,color .2s ease;
}
.drawer-close:hover{border-color:var(--primary);color:var(--primary)}
.drawer-nav{display:grid;gap:6px;border-top:1px solid var(--line);padding-top:18px}
.drawer-nav a{
  padding:12px 14px;
  border-radius:10px;
  font-size:15px;
  color:var(--muted);
  transition:background .2s ease,color .2s ease;
}
.drawer-nav a:hover,.drawer-nav a.active{background:rgba(108,76,241,.08);color:var(--primary)}
.drawer .search-box input{width:100%}
.drawer-foot{margin-top:auto}

/* ===== 返回顶部 ===== */
.to-top{
  position:fixed;
  right:22px;
  bottom:22px;
  width:48px;height:48px;
  border:0;
  border-radius:999px;
  background:var(--primary);
  color:#fff;
  display:grid;
  place-items:center;
  cursor:pointer;
  box-shadow:0 10px 24px rgba(108,76,241,.35);
  opacity:0;
  pointer-events:none;
  transform:translateY(8px);
  transition:opacity .25s ease,transform .25s ease,background .2s ease;
  z-index:65;
}
.to-top.show{opacity:1;pointer-events:auto;transform:translateY(0)}
.to-top:hover{background:var(--primary-hover)}
.to-top:active{background:var(--primary-deep)}

@media (max-width:1100px){
  .nav-main{display:none}
  .burger{display:block}
  .nav-tools .search-box{display:none}
}
@media (max-width:479px){
  .nav-tools .btn-sm{display:none}
}

/* roulang page: category4 */
:root{
  --ink:#0A0918; --ink-2:#171431; --ink-text:#F4F2FF; --ink-sub:#A7A2C6;
  --primary:#6C4CF1; --primary-hover:#5A3AE0; --primary-active:#4A2ED0;
  --accent:#23E0C4; --accent-2:#FF4D9D;
  --bg:#F7F6FC; --surface:#FFFFFF; --line:#E6E4F2; --line-soft:#F2F0FB;
  --text:#15132A; --text-sub:#5C5875;
  --r-card:16px; --r-btn:10px; --r-input:10px; --r-badge:6px;
  --sh-card:0 2px 8px rgba(21,19,42,.05);
  --sh-hover:0 12px 28px rgba(108,76,241,.16);
  --shell:1200px;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:'PingFang SC','HarmonyOS Sans SC','Microsoft YaHei',system-ui,sans-serif;
  font-size:16px;line-height:1.8;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button{font-family:inherit;}
input,select,textarea{font-family:inherit;font-size:15px;color:var(--text);}
h1,h2,h3,h4{margin:0;line-height:1.3;letter-spacing:-.01em;}
p{margin:0;}
ul{margin:0;padding:0;list-style:none;}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:6px;}
.shell{width:100%;max-width:var(--shell);margin:0 auto;padding:0 20px;}
@media (min-width:768px){ .shell{padding:0 32px;} }

/* ============ Header ============ */
.site-header{
  position:sticky;top:0;z-index:60;background:rgba(255,255,255,.96);
  border-bottom:1px solid var(--line);box-shadow:0 1px 3px rgba(21,19,42,.04);
}
.site-header .nav-row{display:flex;align-items:center;justify-content:space-between;gap:20px;height:68px;}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;}
.brand-mark{width:30px;height:30px;flex-shrink:0;}
.brand-text{font-size:18px;font-weight:700;color:var(--text);letter-spacing:-.02em;white-space:nowrap;}
.brand-sub{font-size:12px;font-weight:600;color:var(--primary);margin-left:5px;letter-spacing:.02em;}
.nav-main{display:flex;align-items:center;gap:26px;}
.nav-main a{
  position:relative;font-size:15px;color:var(--text-sub);padding:6px 0;
  transition:color .2s ease;
}
.nav-main a::after{
  content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;
  background:var(--accent);transform:scaleX(0);transform-origin:left;
  transition:transform .2s ease;
}
.nav-main a:hover{color:var(--primary);}
.nav-main a:hover::after{transform:scaleX(1);}
.nav-main a.active{color:var(--text);font-weight:600;}
.nav-main a.active::after{transform:scaleX(1);}
.nav-tools{display:flex;align-items:center;gap:12px;flex-shrink:0;}
.search-box{
  display:flex;align-items:center;gap:8px;height:40px;padding:0 16px;
  border:1px solid var(--line);border-radius:999px;background:#fff;color:var(--text-sub);
  transition:border-color .2s ease;
}
.search-box:focus-within{border-color:var(--primary);}
.search-box input{border:none;outline:none;background:transparent;width:190px;font-size:14px;}
.search-box input::placeholder{color:#9E9AB8;}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 24px;border-radius:var(--r-btn);border:1px solid transparent;
  font-size:15px;font-weight:600;cursor:pointer;
  transition:background-color .2s ease,border-color .2s ease,color .2s ease,transform .2s ease,box-shadow .2s ease;
}
.btn-sm{height:40px;padding:0 18px;font-size:14px;}
.btn-primary{background:var(--primary);color:#fff;}
.btn-primary:hover{background:var(--primary-hover);transform:translateY(-1px);box-shadow:0 10px 22px rgba(108,76,241,.28);}
.btn-primary:active{background:var(--primary-active);transform:translateY(1px);box-shadow:none;}
.btn-outline{background:#fff;color:var(--text);border-color:var(--line);}
.btn-outline:hover{border-color:var(--primary);color:var(--primary);}
.btn-ghost{background:transparent;color:var(--text);border-color:var(--line-soft);}
.btn-ghost:hover{border-color:var(--primary);color:var(--primary);}
.btn-dark-ghost{background:transparent;color:var(--ink-text);border:1px solid rgba(255,255,255,.24);}
.btn-dark-ghost:hover{background:var(--accent);color:var(--ink);border-color:var(--accent);}
.burger{
  display:none;width:42px;height:42px;border:1px solid var(--line);border-radius:var(--r-btn);
  background:#fff;align-items:center;justify-content:center;cursor:pointer;
}
.burger span{position:relative;display:block;width:18px;height:2px;background:var(--text);}
.burger span::before,.burger span::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:var(--text);
}
.burger span::before{top:-6px;}
.burger span::after{top:6px;}
@media (max-width:1100px){
  .search-box{display:none;}
}
@media (max-width:980px){
  .nav-main{display:none;}
  .burger{display:inline-flex;}
  .nav-tools .btn-sm{display:none;}
}
.drawer-mask{
  position:fixed;inset:0;background:rgba(10,9,24,.6);opacity:0;pointer-events:none;
  transition:opacity .25s ease;z-index:70;
}
.drawer-mask.open{opacity:1;pointer-events:auto;}
.drawer{
  position:fixed;top:0;right:0;height:100%;width:300px;max-width:86vw;background:#fff;
  border-left:1px solid var(--line);transform:translateX(100%);transition:transform .28s ease;
  z-index:80;padding:24px 22px;display:flex;flex-direction:column;gap:22px;overflow-y:auto;
}
.drawer.open{transform:translateX(0);}
.drawer-head{display:flex;align-items:center;justify-content:space-between;}
.drawer-close{width:38px;height:38px;border:1px solid var(--line);background:#fff;border-radius:var(--r-btn);cursor:pointer;font-size:18px;color:var(--text-sub);}
.drawer-nav{display:flex;flex-direction:column;gap:4px;}
.drawer-nav a{padding:12px 10px;border-radius:var(--r-btn);color:var(--text-sub);font-size:15px;}
.drawer-nav a:hover{background:var(--line-soft);color:var(--primary);}
.drawer-nav a.active{background:var(--line-soft);color:var(--primary);font-weight:600;}
.drawer .search-box{width:100%;}
.drawer .search-box input{width:100%;}

/* ============ Common ============ */
.section{padding:96px 0;}
.section-tight{padding:72px 0;}
@media (max-width:1024px){ .section{padding:72px 0;} .section-tight{padding:56px 0;} }
@media (max-width:640px){ .section{padding:56px 0;} .section-tight{padding:44px 0;} }
.section-head{max-width:760px;margin-bottom:44px;}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;font-size:12px;font-weight:600;
  color:var(--primary);background:rgba(108,76,241,.08);border-radius:var(--r-badge);
  padding:5px 10px;margin-bottom:14px;letter-spacing:.02em;
}
.h2{font-size:30px;font-weight:700;line-height:1.35;letter-spacing:-.02em;}
@media (max-width:640px){ .h2{font-size:24px;} }
.sub{color:var(--text-sub);font-size:16px;margin-top:14px;}
.badge{
  display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:600;
  color:#12897A;background:rgba(35,224,196,.12);border-radius:var(--r-badge);
  padding:4px 10px;line-height:1.6;
}
.badge-purple{color:var(--primary);background:rgba(108,76,241,.1);}
.badge-pink{color:#C92C72;background:rgba(255,77,157,.12);}
.divider{height:1px;background:var(--line);border:none;margin:0;}

/* ============ Hero ============ */
.page-hero{
  background:linear-gradient(180deg,#FFFFFF 0%,#F7F6FC 100%);
  border-bottom:1px solid var(--line);padding:44px 0 56px;
}
.crumb{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-sub);margin-bottom:20px;}
.crumb a{color:var(--text-sub);}
.crumb a:hover{color:var(--primary);}
.crumb span.sep{color:#B9B5CD;}
.crumb .current{color:var(--text-sub);}
.hero-grid{display:grid;grid-template-columns:5fr 7fr;gap:48px;align-items:center;}
@media (max-width:980px){ .hero-grid{grid-template-columns:1fr;gap:32px;} }
.hero-h1{font-size:40px;font-weight:700;line-height:1.25;letter-spacing:-.02em;}
.hero-h1 .hl{color:var(--primary);}
@media (max-width:1024px){ .hero-h1{font-size:32px;} }
@media (max-width:640px){ .hero-h1{font-size:27px;} }
.hero-lead{margin-top:18px;color:var(--text-sub);font-size:16px;max-width:34em;}
.badge-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px;}
.hero-figure{position:relative;border-radius:20px;overflow:hidden;box-shadow:var(--sh-card);border:1px solid var(--line);}
.hero-figure img{width:100%;height:100%;object-fit:cover;aspect-ratio:16/10;transition:transform .35s ease;}
.hero-figure:hover img{transform:scale(1.03);}
.hero-note{
  position:absolute;left:18px;bottom:18px;background:#fff;border-radius:var(--r-card);
  padding:12px 16px;box-shadow:0 8px 24px rgba(21,19,42,.12);border:1px solid var(--line);
}
.hero-note strong{display:block;font-size:13px;color:var(--text-sub);font-weight:600;}
.hero-note span{font-size:18px;font-weight:800;color:var(--primary);font-variant-numeric:tabular-nums;}

/* ============ Compare ============ */
.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;}
@media (max-width:860px){ .compare-grid{grid-template-columns:1fr;} }
.compare-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  padding:30px 28px;box-shadow:var(--sh-card);transition:box-shadow .3s ease,transform .3s ease,border-color .3s ease;
}
.compare-card:hover{box-shadow:var(--sh-hover);transform:translateY(-3px);border-color:rgba(108,76,241,.4);}
.compare-card.is-soft{background:var(--line-soft);border-color:#DEDAF3;}
.compare-card h3{font-size:19px;font-weight:700;margin-bottom:8px;}
.compare-card .cap{font-size:13px;color:var(--text-sub);margin-bottom:20px;}
.item-list li{display:flex;gap:12px;padding:12px 0;border-top:1px dashed var(--line);}
.item-list li:first-child{border-top:none;padding-top:0;}
.item-list .ico{
  flex-shrink:0;width:22px;height:22px;border-radius:999px;display:flex;align-items:center;
  justify-content:center;font-size:12px;font-weight:700;margin-top:4px;
}
.ico-no{background:rgba(255,77,157,.14);color:#C92C72;}
.ico-yes{background:rgba(35,224,196,.18);color:#12897A;}
.item-list p{font-size:15px;color:var(--text-sub);line-height:1.75;}
.item-list strong{color:var(--text);font-weight:600;}

/* ============ Spec / Channel cards ============ */
.spec-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
@media (max-width:960px){ .spec-grid{grid-template-columns:1fr 1fr;} }
@media (max-width:640px){ .spec-grid{grid-template-columns:1fr;} }
.spec-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  padding:26px 24px;box-shadow:var(--sh-card);position:relative;overflow:hidden;
  transition:transform .3s ease,box-shadow .3s ease,border-color .3s ease;
}
.spec-card::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--accent);}
.spec-card:hover{transform:translateY(-3px);box-shadow:var(--sh-hover);border-color:rgba(108,76,241,.4);}
.spec-card h3{font-size:17px;font-weight:600;margin-bottom:6px;}
.spec-card .alt{font-size:13px;color:var(--text-sub);}
.spec-rows{margin-top:18px;}
.spec-rows div{display:flex;justify-content:space-between;gap:12px;padding:9px 0;border-top:1px solid var(--line);font-size:14px;}
.spec-rows div:first-child{border-top:none;}
.spec-rows dt,.spec-rows span:first-child{color:var(--text-sub);}
.spec-rows b{font-weight:600;font-variant-numeric:tabular-nums;color:var(--text);}

/* ============ Split feature ============ */
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;}
@media (max-width:900px){ .split{grid-template-columns:1fr;gap:30px;} }
.split h2{font-size:28px;font-weight:700;}
.split .body p{color:var(--text-sub);margin-top:16px;font-size:15.5px;}
.ticks{margin-top:22px;display:flex;flex-direction:column;gap:12px;}
.ticks li{display:flex;gap:10px;font-size:15px;color:var(--text);}
.ticks li .dot{
  flex-shrink:0;width:8px;height:8px;border-radius:999px;background:var(--primary);margin-top:10px;
}
.split-figure{border-radius:var(--r-card);overflow:hidden;border:1px solid var(--line);box-shadow:var(--sh-card);}
.split-figure img{width:100%;aspect-ratio:4/3;object-fit:cover;transition:transform .35s ease;}
.split-figure:hover img{transform:scale(1.03);}

/* ============ FAQ ============ */
.faq-wrap{display:grid;grid-template-columns:4fr 8fr;gap:48px;align-items:start;}
@media (max-width:900px){ .faq-wrap{grid-template-columns:1fr;gap:28px;} }
.faq-list{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;box-shadow:var(--sh-card);}
.faq-item{border-top:1px solid var(--line);}
.faq-item:first-child{border-top:none;}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  background:transparent;border:none;text-align:left;cursor:pointer;
  padding:20px 24px;font-size:17px;font-weight:600;color:var(--text);line-height:1.6;
  transition:color .2s ease,background-color .2s ease;
}
.faq-q:hover{color:var(--primary);background:#FCFBFF;}
.faq-q .caret{
  flex-shrink:0;width:22px;height:22px;border-radius:999px;border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;color:var(--text-sub);
  transition:transform .2s ease,color .2s ease,border-color .2s ease;
}
.faq-item.open .faq-q{color:var(--primary);}
.faq-item.open .caret{transform:rotate(180deg);color:var(--primary);border-color:rgba(108,76,241,.4);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease;}
.faq-a-inner{
  padding:0 24px 22px 24px;border-left:2px solid var(--primary);margin-left:24px;
  color:var(--text-sub);font-size:15px;line-height:1.85;
}
.faq-a-inner p + p{margin-top:10px;}

/* ============ Form ============ */
.band-dark{
  background:var(--ink);color:var(--ink-text);position:relative;overflow:hidden;
}
.band-dark::before{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:24px 24px;opacity:.6;pointer-events:none;
}
.band-dark > *{position:relative;}
.band-dark h2{color:#fff;}
.band-dark .sub{color:var(--ink-sub);}
.form-grid{display:grid;grid-template-columns:4fr 8fr;gap:48px;align-items:start;}
@media (max-width:900px){ .form-grid{grid-template-columns:1fr;gap:32px;} }
.guard-list{margin-top:24px;display:flex;flex-direction:column;gap:14px;}
.guard-list li{display:flex;gap:10px;color:var(--ink-sub);font-size:15px;}
.guard-list li .dot{flex-shrink:0;width:8px;height:8px;border-radius:999px;background:var(--accent);margin-top:10px;}
.form-card{
  background:#fff;border-radius:var(--r-card);padding:32px;box-shadow:0 20px 44px rgba(10,9,24,.35);
}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:18px;}
@media (max-width:640px){ .form-row{grid-template-columns:1fr;} }
.field{display:flex;flex-direction:column;gap:8px;margin-bottom:18px;}
.field label{font-size:13.5px;font-weight:600;color:var(--text);}
.field input,.field select,.field textarea{
  height:48px;border:1px solid var(--line);border-radius:var(--r-input);
  padding:0 14px;background:#FCFCFE;outline:none;
  transition:border-color .2s ease,box-shadow .2s ease,background-color .2s ease;
}
.field textarea{height:auto;min-height:110px;padding:12px 14px;resize:vertical;line-height:1.7;}
.field input:focus,.field select:focus,.field textarea:focus{
  border-color:var(--primary);background:#fff;box-shadow:0 0 0 3px rgba(35,224,196,.3);
}
.field .hint{font-size:12px;color:var(--text-sub);}
.check-row{display:flex;gap:10px;align-items:flex-start;margin:6px 0 22px;}
.check-row input{width:18px;height:18px;margin-top:4px;accent-color:var(--primary);flex-shrink:0;}
.check-row label{font-size:13px;color:var(--text-sub);line-height:1.7;}
.form-card .btn{width:100%;}
.form-msg{margin-top:14px;font-size:13px;color:#12897A;display:none;}
.form-msg.show{display:block;}

/* ============ CTA band ============ */
.cta-band{
  background:var(--ink-2);color:var(--ink-text);border-top:1px solid rgba(255,255,255,.08);
}
.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:42px 0;flex-wrap:wrap;}
.cta-inner h2{font-size:24px;font-weight:700;color:#fff;}
.cta-inner p{color:var(--ink-sub);font-size:15px;margin-top:8px;}

/* ============ Footer ============ */
.site-footer{background:var(--ink);color:var(--ink-sub);padding:72px 0 28px;font-size:14px;}
.footer-grid{display:grid;grid-template-columns:5fr 3fr 3fr 3fr;gap:40px;}
@media (max-width:980px){ .footer-grid{grid-template-columns:1fr 1fr;gap:32px;} }
@media (max-width:560px){ .footer-grid{grid-template-columns:1fr;} }
.footer-brand .brand-text{color:#fff;font-size:18px;}
.footer-brand p{margin-top:16px;line-height:1.85;max-width:34em;}
.footer-contact{margin-top:18px;line-height:2;font-size:13.5px;}
.footer-contact strong{color:#E9E6FF;font-weight:600;}
.footer-col h3{font-size:15px;color:#fff;font-weight:600;margin-bottom:18px;}
.footer-col ul{display:flex;flex-direction:column;gap:11px;}
.footer-col a{transition:color .2s ease;}
.footer-col a:hover{color:var(--accent);}
.footer-bottom{
  margin-top:48px;padding-top:22px;border-top:1px solid rgba(255,255,255,.1);
  display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;font-size:13px;color:#8F8AB0;
}
.to-top{
  position:fixed;right:22px;bottom:24px;width:44px;height:44px;border-radius:999px;
  background:var(--primary);color:#fff;border:none;cursor:pointer;display:none;
  align-items:center;justify-content:center;box-shadow:0 10px 24px rgba(108,76,241,.35);
  transition:background-color .2ease,transform .2s ease;z-index:50;
}
.to-top:hover{background:var(--primary-hover);transform:translateY(-2px);}
.to-top.show{display:flex;}