/* roulang page: index */
:root{
  --brand:#1557D8;
  --brand-dark:#0F42A8;
  --brand-soft:#EEF3FB;
  --accent:#FF6B2C;
  --accent-dark:#E85A1E;
  --ok:#12B981;
  --title:#0E1726;
  --text:#4A5A72;
  --muted:#8794A8;
  --line:#E8EDF5;
  --line-strong:#CFDCF2;
  --bg:#F5F8FC;
  --card:#FFFFFF;
  --r-s:8px;
  --r-m:14px;
  --r-l:20px;
  --sh-1:0 1px 2px rgba(16,42,88,.06),0 12px 32px -12px rgba(16,42,88,.14);
  --sh-2:0 2px 6px rgba(16,42,88,.08),0 20px 46px -16px rgba(16,42,88,.24);
  --t:all .2s cubic-bezier(.4,0,.2,1);
  --ease:cubic-bezier(.4,0,.2,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,"Segoe UI",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:var(--brand);text-decoration:none;transition:var(--t)}
button,input{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(--brand);outline-offset:2px;border-radius:6px}
::selection{background:rgba(21,87,216,.16)}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
.num{font-variant-numeric:tabular-nums}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(255,255,255,.94);
  backdrop-filter:saturate(150%) blur(10px);
  border-bottom:1px solid var(--line);
  transition:var(--t);
}
.site-header.is-scrolled{box-shadow:0 1px 0 rgba(16,42,88,.06),0 10px 26px -20px rgba(16,42,88,.35)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;gap:32px;height:74px}
.logo{display:flex;align-items:center;gap:10px;color:var(--title);font-weight:700;font-size:19px;letter-spacing:.2px;white-space:nowrap}
.logo:hover{color:var(--brand)}
.logo-main{font-weight:700}
.logo-sep{width:1px;height:16px;background:var(--line-strong);display:inline-block}
.logo-sub{font-weight:400;font-size:14px;color:var(--muted);letter-spacing:1px}
.nav-links{display:flex;align-items:center;gap:32px}
.nav-link{position:relative;font-size:15px;font-weight:500;color:var(--text);padding:6px 2px;white-space:nowrap}
.nav-link::after{
  content:"";position:absolute;left:50%;bottom:-2px;width:20px;height:2px;border-radius:2px;
  background:var(--brand);transform:translateX(-50%) scaleX(0);transform-origin:center;
  transition:transform .2s var(--ease);
}
.nav-link:hover{color:var(--brand)}
.nav-link:hover::after,.nav-link.active::after{transform:translateX(-50%) scaleX(1)}
.nav-link.active{color:var(--brand);font-weight:600}
.nav-right{display:flex;align-items:center;gap:14px}
.nav-toggle{
  display:none;width:42px;height:42px;border:1px solid var(--line);background:#fff;border-radius:12px;
  cursor:pointer;padding:0;align-items:center;justify-content:center;flex-direction:column;gap:5px;transition:var(--t);
}
.nav-toggle span{display:block;width:18px;height:2px;border-radius:2px;background:var(--title);transition:var(--t)}
.nav-toggle:hover{border-color:var(--line-strong);box-shadow:var(--sh-1)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 28px;border-radius:999px;border:1px solid transparent;
  font-size:15px;font-weight:600;cursor:pointer;white-space:nowrap;transition:var(--t);
}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 10px 24px -14px rgba(21,87,216,.9)}
.btn-primary:hover{background:#1f63e6;transform:translateY(-1px);box-shadow:0 14px 28px -14px rgba(21,87,216,.95)}
.btn-primary:active{transform:translateY(1px);box-shadow:none}
.btn-accent{background:var(--accent);color:#fff;box-shadow:0 10px 24px -14px rgba(255,107,44,.95)}
.btn-accent:hover{background:#ff7b42;transform:translateY(-1px);box-shadow:0 14px 28px -14px rgba(255,107,44,1)}
.btn-accent:active{transform:translateY(1px);box-shadow:none}
.btn-ghost{background:#fff;color:var(--title);border-color:var(--line-strong)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand);transform:translateY(-1px);box-shadow:var(--sh-1)}
.btn-sm{height:40px;padding:0 20px;font-size:14px}
.btn[disabled]{opacity:.45;cursor:not-allowed;transform:none;box-shadow:none}
.btn-text{
  display:inline-flex;align-items:center;gap:6px;font-size:15px;font-weight:600;color:var(--brand);
  background:none;border:0;padding:0;cursor:pointer;
}
.btn-text svg{transition:transform .2s var(--ease)}
.btn-text:hover svg{transform:translateX(2px)}

/* ---------- chips / badges ---------- */
.chip{
  display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:999px;
  background:var(--brand-soft);color:var(--brand);font-size:12px;font-weight:600;letter-spacing:.2px;
}
.chip-ok{background:rgba(18,185,129,.12);color:#0E8F66}
.chip-accent{background:rgba(255,107,44,.12);color:#DA5317}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--brand);
  background:#fff;border:1px solid var(--line);border-radius:999px;padding:6px 14px;box-shadow:var(--sh-1);
}
.eyebrow i{width:6px;height:6px;border-radius:50%;background:var(--ok);display:inline-block}

/* ---------- section frames ---------- */
.section{padding:88px 0}
.section-soft{background:var(--brand-soft)}
.section-white{background:#fff}
.section-head{max-width:720px;margin-bottom:44px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.section-head h2{
  position:relative;font-size:28px;line-height:1.45;font-weight:650;color:var(--title);letter-spacing:.2px;
  padding-left:16px;
}
.section-head.center h2{padding-left:0}
.section-head h2::before{
  content:"";position:absolute;left:0;top:.28em;bottom:.28em;width:3px;border-radius:3px;background:var(--brand);
}
.section-head.center h2::before{display:none}
.section-head p{margin-top:14px;font-size:16px;color:var(--muted);line-height:1.85}
.head-row{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:36px}
.head-row .section-head{margin-bottom:0}

/* ---------- hero ---------- */
.hero{
  position:relative;overflow:hidden;
  background:linear-gradient(180deg,#FFFFFF 0%,#F2F6FD 65%,#EEF3FB 100%);
  border-bottom:1px solid var(--line);
}
.hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.045;
  background-image:repeating-linear-gradient(115deg,#1557D8 0 1px,transparent 1px 13px);
}
.hero-grid{
  position:relative;display:grid;grid-template-columns:1.05fr .95fr;gap:64px;align-items:center;
  padding:76px 0 88px;
}
.hero-copy h1{
  font-size:42px;line-height:1.28;font-weight:700;color:var(--title);letter-spacing:-.4px;margin:22px 0 18px;
}
.hero-copy h1 em{font-style:normal;color:var(--brand)}
.hero-lead{font-size:17px;line-height:1.85;color:var(--text);max-width:540px}
.hero-actions{display:flex;align-items:center;gap:22px;flex-wrap:wrap;margin-top:32px}
.hero-stats{display:flex;flex-wrap:wrap;gap:12px;margin-top:36px}
.hero-stats li{
  display:flex;align-items:center;gap:8px;font-size:13.5px;color:var(--muted);
  background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 16px;box-shadow:var(--sh-1);
}
.hero-stats li b{color:var(--title);font-weight:600}
.hero-visual{position:relative}
.hero-shot{
  position:relative;border-radius:var(--r-l);overflow:hidden;background:#DCE6F7;
  box-shadow:var(--sh-2);transform:rotate(-1.4deg);border:1px solid #fff;
}
.hero-shot img{width:100%;aspect-ratio:4/3.15;object-fit:cover}
.hero-shot::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(200deg,rgba(21,87,216,.06) 0%,rgba(14,23,38,.18) 100%);
}
.float-card{
  position:absolute;left:-18px;bottom:-22px;display:flex;align-items:center;gap:12px;
  background:#fff;border:1px solid var(--line);border-radius:var(--r-m);padding:14px 18px;
  box-shadow:var(--sh-2);max-width:270px;
}
.float-card .fc-dot{width:10px;height:10px;border-radius:50%;background:var(--ok);flex:0 0 auto;box-shadow:0 0 0 4px rgba(18,185,129,.14)}
.float-card strong{display:block;font-size:14px;color:var(--title);font-weight:650}
.float-card span{font-size:12.5px;color:var(--muted);line-height:1.6}

/* ---------- carousel ---------- */
.rail-wrap{position:relative}
.rail{
  display:flex;gap:24px;overflow-x:auto;scroll-snap-type:x mandatory;
  padding:8px 4px 26px;scrollbar-width:none;-ms-overflow-style:none;
}
.rail::-webkit-scrollbar{display:none}
.rail-item{flex:0 0 356px;scroll-snap-align:start}
.rail-shot{
  border-radius:var(--r-l);overflow:hidden;background:#DCE6F7;border:1px solid var(--line);
  box-shadow:var(--sh-1);transition:var(--t);
}
.rail-item:hover .rail-shot{transform:translateY(-2px);box-shadow:var(--sh-2);border-color:var(--line-strong)}
.rail-shot img{width:100%;aspect-ratio:16/10;object-fit:cover}
.rail-cap{display:flex;align-items:center;gap:10px;margin-top:14px}
.rail-cap b{font-size:15px;color:var(--title);font-weight:650}
.rail-cap span{font-size:13px;color:var(--muted)}
.rail-nav{display:flex;gap:10px}
.rail-btn{
  width:42px;height:42px;border-radius:50%;border:1px solid var(--line-strong);background:#fff;color:var(--brand);
  display:inline-flex;align-items:center;justify-content:center;cursor:pointer;transition:var(--t);
}
.rail-btn:hover{background:var(--brand);border-color:var(--brand);color:#fff;transform:translateY(-1px)}
.rail-btn:active{transform:translateY(1px)}

/* ---------- value block ---------- */
.value-grid{display:grid;grid-template-columns:.95fr 1.05fr;gap:64px;align-items:center}
.value-media{border-radius:var(--r-l);overflow:hidden;border:1px solid var(--line);box-shadow:var(--sh-1);background:#DCE6F7}
.value-media img{width:100%;aspect-ratio:4/3.4;object-fit:cover}
.value-list li{display:flex;gap:20px;padding:22px 0;border-top:1px solid var(--line)}
.value-list li:first-child{border-top:0;padding-top:0}
.value-list .idx{
  font-size:30px;font-weight:700;line-height:1;color:rgba(21,87,216,.28);
  font-variant-numeric:tabular-nums;flex:0 0 auto;width:52px;
}
.value-list h3{font-size:17.5px;font-weight:650;color:var(--title);margin-bottom:6px}
.value-list p{font-size:14.5px;line-height:1.8;color:var(--text)}

/* ---------- spec ---------- */
.spec-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:36px}
.spec-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-m);padding:10px 22px;box-shadow:var(--sh-1);
}
.spec-row{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:15px 0;border-top:1px solid var(--line)}
.spec-row:first-child{border-top:0}
.spec-row dt{font-size:14px;color:var(--muted)}
.spec-row dd{margin:0;font-size:16px;font-weight:600;color:var(--title);text-align:right;font-variant-numeric:tabular-nums}
.spec-note{margin-top:28px;display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.spec-note p{font-size:14px;color:var(--muted)}

/* ---------- scenario stagger ---------- */
.stagger{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.stagger .card:nth-child(even){transform:translateY(24px)}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r-m);box-shadow:var(--sh-1);
  overflow:hidden;transition:var(--t);
}
.card:hover{transform:translateY(-2px);border-color:var(--line-strong);box-shadow:var(--sh-2)}
.stagger .card:nth-child(even):hover{transform:translateY(22px)}
.card-media{background:#DCE6F7}
.card-media img{width:100%;aspect-ratio:16/10;object-fit:cover}
.card-body{padding:22px 24px 24px}
.card-body h3{font-size:17.5px;font-weight:650;color:var(--title);margin-bottom:8px}
.card-body p{font-size:14.5px;line-height:1.8;color:var(--text)}
.card-meta{display:flex;align-items:center;gap:10px;margin-top:16px;font-size:12.5px;color:var(--muted)}

/* ---------- note list ---------- */
.note-list li{
  position:relative;padding-left:20px;font-size:14.5px;line-height:1.85;color:var(--text);margin-top:10px;
}
.note-list li::before{
  content:"";position:absolute;left:2px;top:.72em;width:6px;height:6px;border-radius:50%;background:var(--brand);
}

/* ---------- download ---------- */
.download-panel{
  position:relative;overflow:hidden;background:#fff;border:1px solid var(--line);border-radius:var(--r-l);
  padding:48px 40px;box-shadow:var(--sh-1);text-align:center;
}
.download-panel::before{
  content:"";position:absolute;inset:0;opacity:.05;pointer-events:none;
  background-image:repeating-linear-gradient(115deg,#1557D8 0 1px,transparent 1px 14px);
}
.download-panel h2{position:relative;font-size:26px;font-weight:650;color:var(--title)}
.download-panel p{position:relative;margin-top:12px;font-size:15px;color:var(--muted)}
.dl-actions{position:relative;display:flex;flex-wrap:wrap;justify-content:center;gap:14px;margin-top:30px}
.dl-tip{position:relative;margin-top:22px;font-size:12.5px;color:var(--muted);line-height:1.8}
.dl-tip a{color:var(--brand)}

/* ---------- news (cms) ---------- */
.news-list{border-top:1px solid var(--line)}
.news-item{
  display:flex;gap:22px;padding:24px 4px;border-bottom:1px solid var(--line);transition:var(--t);
}
.news-item:hover{background:#fff}
.news-index{
  flex:0 0 auto;width:44px;font-size:15px;font-weight:700;color:rgba(21,87,216,.42);
  font-variant-numeric:tabular-nums;padding-top:4px;
}
.news-body{flex:1 1 auto;min-width:0}
.news-title{font-size:17.5px;font-weight:650;line-height:1.55}
.news-title a{color:var(--title)}
.news-title a:hover{color:var(--brand)}
.news-summary{
  margin-top:8px;font-size:14.5px;line-height:1.8;color:var(--text);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.news-meta{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-top:12px;font-size:12.5px;color:var(--muted)}
.news-more{margin-left:auto;font-size:13px;font-weight:600;color:var(--brand)}
.news-more:hover{text-decoration:underline}
.news-cover{flex:0 0 auto;width:132px;border-radius:var(--r-s);overflow:hidden;background:#DCE6F7}
.news-cover img{width:100%;aspect-ratio:16/11;object-fit:cover}
.empty-state{
  min-height:200px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;
  border:1px dashed var(--line-strong);border-radius:var(--r-m);background:#fff;color:var(--muted);font-size:14px;
}
.pager-slot{margin-top:30px;display:flex;justify-content:center;gap:8px;min-height:1px}
.pager-slot a,.pager-slot span{
  display:inline-flex;align-items:center;justify-content:center;min-width:38px;height:38px;padding:0 12px;
  border:1px solid var(--line);border-radius:10px;background:#fff;font-size:13.5px;color:var(--text);
}
.pager-slot a:hover{border-color:var(--brand);color:var(--brand)}

/* ---------- faq ---------- */
.faq-narrow{max-width:820px;margin:0 auto}
.faq-item{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-m);margin-bottom:12px;
  box-shadow:var(--sh-1);overflow:hidden;transition:var(--t);
}
.faq-item:hover{border-color:var(--line-strong)}
.faq-item summary{
  position:relative;list-style:none;cursor:pointer;padding:20px 60px 20px 24px;
  font-size:16px;font-weight:600;color:var(--title);line-height:1.6;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{
  content:"";position:absolute;right:24px;top:50%;width:14px;height:14px;
  transform:translateY(-50%) rotate(0deg);transition:transform .2s var(--ease);
  background:
    linear-gradient(var(--brand),var(--brand)) center/14px 2px no-repeat,
    linear-gradient(var(--brand),var(--brand)) center/2px 14px no-repeat;
}
.faq-item[open] summary::after{transform:translateY(-50%) rotate(45deg)}
.faq-item[open] summary{color:var(--brand)}
.faq-answer{padding:0 24px 22px;font-size:15px;line-height:1.9;color:var(--text);border-top:1px solid var(--line);margin-top:0;padding-top:16px}

/* ---------- cta ---------- */
.cta-band{background:var(--brand-soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line);position:relative;overflow:hidden}
.cta-band::before{
  content:"";position:absolute;inset:0;opacity:.05;pointer-events:none;
  background-image:repeating-linear-gradient(115deg,#1557D8 0 1px,transparent 1px 14px);
}
.cta-inner{position:relative;display:flex;align-items:center;justify-content:space-between;gap:32px;padding:56px 0}
.cta-inner h2{font-size:26px;font-weight:650;color:var(--title);line-height:1.5}
.cta-inner p{margin-top:10px;font-size:15px;color:var(--muted)}

/* ---------- footer ---------- */
.site-footer{background:#F5F8FC;border-top:1px solid var(--line);padding:64px 0 0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.1fr;gap:40px}
.footer-brand .logo{font-size:18px;margin-bottom:16px}
.footer-brand p{font-size:13.5px;line-height:1.9;color:var(--muted);max-width:320px}
.footer-col h4{font-size:14px;font-weight:650;color:var(--title);margin-bottom:16px;letter-spacing:.4px}
.footer-col li{margin-bottom:10px}
.footer-col a{font-size:13.5px;color:var(--text)}
.footer-col a:hover{color:var(--brand)}
.footer-col p{font-size:13.5px;line-height:1.9;color:var(--muted)}
.footer-bottom{
  margin-top:52px;border-top:1px solid var(--line);padding:20px 0;display:flex;align-items:center;
  justify-content:space-between;gap:18px;flex-wrap:wrap;font-size:13px;color:var(--muted);
}
.footer-bottom a{color:var(--muted)}
.footer-bottom a:hover{color:var(--brand)}

/* ---------- responsive ---------- */
@media (max-width:1199px){
  .hero-grid{gap:44px}
  .hero-copy h1{font-size:36px}
  .value-grid{gap:44px}
  .rail-item{flex:0 0 320px}
}
@media (max-width:991px){
  .nav-toggle{display:flex}
  .nav-links{
    position:fixed;top:74px;left:0;right:0;bottom:0;background:#fff;flex-direction:column;align-items:stretch;
    gap:0;padding:8px 20px 32px;transform:translateY(-12px);opacity:0;pointer-events:none;
    transition:opacity .2s var(--ease),transform .2s var(--ease);overflow-y:auto;border-top:1px solid var(--line);
  }
  .nav-links.is-open{opacity:1;transform:translateY(0);pointer-events:auto}
  .nav-link{font-size:16px;padding:18px 2px;border-bottom:1px solid var(--line)}
  .nav-link::after{display:none}
  .nav-link.active{color:var(--brand)}
  .nav-links .nav-cta-mobile{display:inline-flex;margin-top:24px}
  .nav-right .btn-sm{display:none}
  .hero-grid{grid-template-columns:1fr;gap:40px;padding:56px 0 68px}
  .hero-copy h1{font-size:32px}
  .hero-shot{transform:none}
  .float-card{position:static;margin-top:16px;max-width:none}
  .section{padding:64px 0}
  .value-grid{grid-template-columns:1fr;gap:36px}
  .spec-grid{grid-template-columns:1fr}
  .stagger .card:nth-child(even){transform:none}
  .stagger .card:nth-child(even):hover{transform:translateY(-2px)}
  .cta-inner{flex-direction:column;align-items:flex-start;padding:48px 0}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
}
@media (max-width:767px){
  .section{padding:48px 0}
  .section-head h2{font-size:22px}
  .hero-copy h1{font-size:28px}
  .hero-lead{font-size:15.5px}
  .stagger{grid-template-columns:1fr}
  .rail-item{flex:0 0 78%}
  .head-row{flex-direction:column;align-items:flex-start;gap:16px}
  .news-item{gap:14px}
  .news-index{width:32px;font-size:13px}
  .news-cover{display:none}
  .download-panel{padding:36px 22px}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .cta-inner h2{font-size:22px}
}
@media (max-width:559px){
  .container{padding:0 16px}
  .nav-wrap{height:66px}
  .nav-links{top:66px}
  .logo{font-size:16.5px;gap:8px}
  .logo-sub{font-size:12.5px}
  .btn{height:46px;padding:0 22px;font-size:14.5px}
  .hero-actions{gap:16px}
  .hero-stats li{font-size:13px;padding:7px 13px}
  .rail-item{flex:0 0 86%}
  .spec-card{padding:6px 16px}
  .spec-row{flex-direction:column;align-items:flex-start;gap:4px;padding:12px 0}
  .spec-row dd{text-align:left}
  .faq-item summary{font-size:15px;padding:16px 52px 16px 18px}
  .faq-answer{padding:14px 18px 18px}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}

/* roulang page: article */
:root{
  --brand:#1557D8;
  --brand-hover:#2B68E0;
  --brand-deep:#0F45AE;
  --accent:#FF6B2C;
  --accent-hover:#FF7D45;
  --accent-deep:#E85A1C;
  --green:#12B981;
  --ink:#0E1726;
  --text:#4A5A72;
  --muted:#8794A8;
  --line:#E8EDF5;
  --line-strong:#CFDCF2;
  --bg:#F5F8FC;
  --card:#FFFFFF;
  --soft:#EEF3FB;
  --radius-sm:8px;
  --radius:14px;
  --radius-lg:20px;
  --radius-pill:999px;
  --shadow-1:0 1px 2px rgba(16,42,88,.06),0 12px 32px -12px rgba(16,42,88,.14);
  --shadow-2:0 2px 6px rgba(16,42,88,.08),0 20px 44px -14px rgba(16,42,88,.2);
  --ease:cubic-bezier(.4,0,.2,1);
  --header-h:68px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,"Segoe UI",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;border:0}
a{color:var(--brand);text-decoration:none;transition:color .2s var(--ease),border-color .2s var(--ease)}
a:hover{color:var(--brand-deep)}
button,input{font:inherit;color:inherit}
button{cursor:pointer}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:4px}
::selection{background:rgba(21,87,216,.14)}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
.container-narrow{width:100%;max-width:760px;margin:0 auto;padding:0 20px}
h1,h2,h3,h4{color:var(--ink);font-weight:700;line-height:1.4;margin:0}
.tnum{font-variant-numeric:tabular-nums}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(255,255,255,.94);
  backdrop-filter:saturate(160%) blur(10px);
  -webkit-backdrop-filter:saturate(160%) blur(10px);
  border-bottom:1px solid transparent;
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease),background .2s var(--ease);
}
.site-header.is-scrolled{border-bottom-color:var(--line);box-shadow:0 1px 0 rgba(16,42,88,.02),0 10px 24px -20px rgba(16,42,88,.45)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;gap:24px;height:var(--header-h)}
.logo{display:inline-flex;align-items:center;gap:9px;color:var(--ink);font-weight:700;letter-spacing:.2px}
.logo:hover{color:var(--ink)}
.logo-main{font-size:19px;font-weight:700}
.logo-sep{display:inline-block;width:1px;height:14px;background:var(--line-strong)}
.logo-sub{font-size:13px;font-weight:500;color:var(--muted);letter-spacing:.6px}
.nav-links{display:flex;align-items:center;gap:32px}
.nav-link{position:relative;font-size:15px;font-weight:500;color:var(--ink);padding:6px 0;line-height:1.5}
.nav-link::after{
  content:"";position:absolute;left:50%;bottom:0;width:20px;height:2px;border-radius:2px;
  background:var(--brand);transform:translateX(-50%) scaleX(0);transform-origin:center;
  transition:transform .2s var(--ease);
}
.nav-link:hover{color:var(--brand)}
.nav-link:hover::after,.nav-link.active::after{transform:translateX(-50%) scaleX(1)}
.nav-link.active{color:var(--brand);font-weight:600}
.nav-right{display:flex;align-items:center;gap:12px}
.nav-toggle{
  display:none;width:42px;height:42px;border:1px solid var(--line);background:#fff;border-radius:12px;
  flex-direction:column;align-items:center;justify-content:center;gap:4px;padding:0;
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--line-strong)}
.nav-toggle span{display:block;width:16px;height:2px;border-radius:2px;background:var(--ink);transition:transform .2s var(--ease),opacity .2s var(--ease)}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.nav-cta-mobile{display:none}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 28px;border-radius:var(--radius-pill);
  font-size:15px;font-weight:600;border:1px solid transparent;white-space:nowrap;
  transition:all .2s var(--ease);
}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 10px 24px -12px rgba(21,87,216,.72)}
.btn-primary:hover{background:var(--brand-hover);color:#fff;transform:translateY(-1px);box-shadow:0 16px 30px -14px rgba(21,87,216,.78)}
.btn-primary:active{transform:translateY(1px);box-shadow:none}
.btn-accent{background:var(--accent);color:#fff;box-shadow:0 10px 24px -12px rgba(255,107,44,.78)}
.btn-accent:hover{background:var(--accent-hover);color:#fff;transform:translateY(-1px);box-shadow:0 16px 30px -14px rgba(255,107,44,.8)}
.btn-accent:active{transform:translateY(1px);box-shadow:none}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--line-strong);color:var(--brand);transform:translateY(-1px)}
.btn-ghost:active{transform:translateY(1px)}
.btn-sm{height:40px;padding:0 20px;font-size:14px}
.btn-text{display:inline-flex;align-items:center;gap:6px;font-size:15px;font-weight:600;color:var(--brand)}
.btn-text .arrow{transition:transform .2s var(--ease)}
.btn-text:hover .arrow{transform:translateX(2px)}

/* ---------- 徽章 / 标签 ---------- */
.badge{
  display:inline-flex;align-items:center;gap:6px;height:24px;padding:0 10px;border-radius:var(--radius-pill);
  background:var(--soft);color:var(--brand);font-size:12px;font-weight:600;line-height:1;white-space:nowrap;
}
.badge-ok{background:#E6F7F1;color:#0E9C6C}
.tag{
  display:inline-flex;align-items:center;height:26px;padding:0 12px;border-radius:var(--radius-pill);
  background:#fff;border:1px solid var(--line);color:var(--text);font-size:13px;
}

/* ---------- 阅读进度 ---------- */
.read-progress{position:fixed;top:0;left:0;height:3px;width:0;background:var(--brand);z-index:90;transition:width .1s linear}

/* ---------- 面包屑 ---------- */
.crumb-bar{padding:22px 0 0}
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:14px;color:var(--muted)}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--brand)}
.breadcrumb .sep{color:#C6D2E3;font-size:12px}
.breadcrumb .current{color:var(--brand);font-weight:600}

/* ---------- 文章页头 ---------- */
.article-head{padding:18px 0 30px}
.article-head h1{font-size:32px;line-height:1.42;font-weight:700;margin:16px 0 18px;letter-spacing:.2px}
.article-meta{display:flex;flex-wrap:wrap;align-items:center;gap:22px;font-size:14px;color:var(--muted);padding-bottom:20px;border-bottom:1px solid var(--line)}
.article-meta .dot{width:4px;height:4px;border-radius:50%;background:#C6D2E3}

/* ---------- 正文 ---------- */
.article-wrap{padding:30px 0 70px}
.article-body{
  max-width:760px;margin:0 auto;background:var(--card);border:1px solid var(--line);
  border-radius:var(--radius-lg);box-shadow:var(--shadow-1);padding:42px 44px 48px;
}
.article-body>*:first-child{margin-top:0}
.article-body p{margin:0 0 22px;line-height:1.9;color:var(--text)}
.article-body h2{position:relative;font-size:24px;font-weight:650;color:var(--ink);margin:40px 0 16px;padding-left:14px;line-height:1.45}
.article-body h2::before{content:"";position:absolute;left:0;top:7px;bottom:7px;width:3px;border-radius:3px;background:var(--brand)}
.article-body h3{font-size:18px;font-weight:650;color:var(--ink);margin:28px 0 12px}
.article-body h4{font-size:16px;font-weight:650;color:var(--ink);margin:22px 0 10px}
.article-body ul,.article-body ol{margin:0 0 22px;padding-left:6px;list-style:none}
.article-body ol{padding-left:0;counter-reset:olc}
.article-body ul li{position:relative;padding-left:18px;margin-bottom:10px;line-height:1.85}
.article-body ul li::before{content:"";position:absolute;left:0;top:.72em;width:6px;height:6px;border-radius:50%;background:var(--brand)}
.article-body ol li{position:relative;padding-left:28px;margin-bottom:10px;counter-increment:olc;line-height:1.85}
.article-body ol li::before{
  content:counter(olc);position:absolute;left:0;top:.35em;width:20px;height:20px;border-radius:50%;
  background:var(--soft);color:var(--brand);font-size:12px;font-weight:700;
  display:flex;align-items:center;justify-content:center;
}
.article-body blockquote{
  margin:26px 0;padding:18px 22px;background:var(--soft);border-left:3px solid var(--brand);
  border-radius:12px;color:var(--ink);
}
.article-body blockquote p:last-child{margin-bottom:0}
.article-body img{border-radius:14px;margin:26px auto;box-shadow:var(--shadow-1)}
.article-body figure{margin:26px 0}
.article-body figcaption{font-size:13px;color:var(--muted);text-align:center;margin-top:10px}
.article-body table{width:100%;border-collapse:collapse;margin:26px 0;font-size:15px}
.article-body th,.article-body td{border:1px solid var(--line);padding:11px 14px;text-align:left}
.article-body th{background:var(--soft);color:var(--ink);font-weight:600}
.article-body tbody tr:nth-child(even) td{background:#FAFCFF}
.article-body a{color:var(--brand);text-decoration:underline;text-underline-offset:3px}
.article-body a:hover{text-decoration:none}
.article-body hr{border:0;border-top:1px solid var(--line);margin:34px 0}
.article-body strong{color:var(--ink)}

/* ---------- 空态 ---------- */
.empty-state{
  max-width:760px;margin:0 auto;background:var(--card);border:1px dashed var(--line-strong);
  border-radius:var(--radius-lg);padding:64px 28px;text-align:center;
}
.empty-state svg{width:46px;height:46px;color:var(--line-strong);margin:0 auto 16px}
.empty-state h2{font-size:20px;margin-bottom:10px}
.empty-state p{font-size:14px;color:var(--muted);margin:0 0 20px}

/* ---------- 文末 ---------- */
.after-article{max-width:760px;margin:0 auto}
.after-line{border:0;border-top:1px solid var(--line);margin:0 0 26px}
.after-actions{display:flex;flex-wrap:wrap;gap:14px;align-items:center;justify-content:space-between;margin-bottom:10px}
.section{padding:64px 0}
.section-soft{background:var(--soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:30px;flex-wrap:wrap}
.section-head h2{font-size:26px;letter-spacing:.2px}
.section-head p{font-size:14px;color:var(--muted);margin:8px 0 0}

/* ---------- 卡片 ---------- */
.card{
  display:flex;flex-direction:column;background:var(--card);border:1px solid var(--line);
  border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-1);
  transition:transform .2s var(--ease),box-shadow .2s var(--ease),border-color .2s var(--ease);
}
.card:hover{transform:translateY(-2px);border-color:var(--line-strong);box-shadow:var(--shadow-2)}
.card-figure{aspect-ratio:16/10;background:var(--soft);overflow:hidden}
.card-figure img{width:100%;height:100%;object-fit:cover;transition:transform .3s var(--ease)}
.card:hover .card-figure img{transform:scale(1.03)}
.card-body{padding:18px 20px 20px;display:flex;flex-direction:column;gap:10px;flex:1}
.card-body h3{font-size:17px;font-weight:650;color:var(--ink);line-height:1.6}
.card-body p{font-size:14px;color:var(--text);margin:0;line-height:1.75;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-meta{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:auto;font-size:13px;color:var(--muted)}
.card-link{font-size:14px;font-weight:600;color:var(--brand);display:inline-flex;align-items:center;gap:6px}
.card:hover .card-link .arrow{transform:translateX(2px)}
.card-link .arrow{transition:transform .2s var(--ease)}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}

/* ---------- CTA ---------- */
.cta-strip{
  position:relative;padding:66px 0;border-top:1px solid var(--line);
  background:#EEF3FB url('/assets/images/backpic/back-2.png') center/cover no-repeat;overflow:hidden;
}
.cta-strip::before{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(245,248,252,.94),rgba(238,243,251,.9))}
.cta-strip .container{position:relative;z-index:1}
.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap}
.cta-inner h2{font-size:26px;margin-bottom:8px}
.cta-inner p{margin:0;font-size:15px;color:var(--text)}
.cta-actions{display:flex;gap:14px;flex-wrap:wrap}
.cta-note{margin-top:16px;font-size:13px;color:var(--muted)}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--bg);border-top:1px solid var(--line);padding:56px 0 0}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:34px}
.footer-brand p{font-size:14px;color:var(--muted);line-height:1.9;margin:14px 0 0;max-width:330px}
.footer-col h4{font-size:15px;font-weight:650;color:var(--ink);margin:0 0 16px}
.footer-col ul{list-style:none;margin:0;padding:0}
.footer-col li{margin-bottom:10px}
.footer-col a{font-size:14px;color:var(--text)}
.footer-col a:hover{color:var(--brand)}
.footer-col p{font-size:13px;color:var(--muted);line-height:1.9;margin:0}
.footer-bottom{
  display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;
  padding:20px 0 28px;border-top:1px solid var(--line);font-size:13px;color:var(--muted);
}

/* ---------- 断点 ---------- */
@media (max-width:1199px){
  .article-head h1{font-size:29px}
}
@media (max-width:991px){
  .nav-links{
    position:fixed;left:0;right:0;top:var(--header-h);
    display:flex;flex-direction:column;align-items:stretch;gap:0;
    background:#fff;border-bottom:1px solid var(--line);padding:8px 20px 22px;
    transform:translateY(-12px);opacity:0;visibility:hidden;
    max-height:calc(100vh - var(--header-h));overflow-y:auto;
    transition:transform .2s var(--ease),opacity .2s var(--ease),visibility .2s var(--ease);
    box-shadow:0 22px 40px -26px rgba(16,42,88,.5);
  }
  .nav-links.is-open{transform:none;opacity:1;visibility:visible}
  .nav-link{padding:15px 0;border-bottom:1px solid var(--line);font-size:16px}
  .nav-link::after{display:none}
  .nav-link.active{color:var(--brand)}
  .nav-toggle{display:flex}
  .nav-right .btn-accent{display:none}
  .nav-cta-mobile{display:inline-flex !important;margin-top:18px}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .section{padding:56px 0}
  .cta-strip{padding:54px 0}
}
@media (max-width:767px){
  body{font-size:15.5px}
  .article-head h1{font-size:24px;margin:14px 0 16px}
  .article-body{padding:26px 20px 32px;border-radius:16px}
  .article-body h2{font-size:21px;margin-top:32px}
  .article-body table{display:block;overflow-x:auto;white-space:nowrap}
  .grid-3{grid-template-columns:1fr}
  .section{padding:48px 0}
  .section-head h2{font-size:22px}
  .cta-inner h2{font-size:22px}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
}
@media (max-width:559px){
  .container{padding:0 16px}
  .container-narrow{padding:0 16px}
  .logo-main{font-size:17px}
  .logo-sub{font-size:12px}
  .btn{height:46px;padding:0 22px;font-size:14.5px}
  .btn-sm{height:38px;padding:0 16px}
  .footer-grid{grid-template-columns:1fr}
  .article-body{padding:22px 16px 28px}
}

/* roulang page: category1 */
:root{
  --brand:#1557D8;
  --brand-dark:#0F44AD;
  --brand-soft:#E6EEFD;
  --accent:#FF6B2C;
  --accent-dark:#E85A1C;
  --green:#12B981;
  --green-soft:#E4F7F0;
  --ink:#0E1726;
  --body:#4A5A72;
  --muted:#8794A8;
  --line:#E8EDF5;
  --line-strong:#CFDCF2;
  --bg:#F5F8FC;
  --soft:#EEF3FB;
  --card:#FFFFFF;
  --r-sm:8px;
  --r-md:14px;
  --r-lg:20px;
  --r-pill:999px;
  --sh-1:0 1px 2px rgba(16,42,88,.06), 0 12px 32px -12px rgba(16,42,88,.14);
  --sh-2:0 2px 6px rgba(16,42,88,.08), 0 22px 46px -16px rgba(16,42,88,.22);
  --t:all .2s cubic-bezier(.4,0,.2,1);
  --maxw:1200px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.8;
  color:var(--body);
  background:#fff;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{margin:0;color:var(--ink);line-height:1.32;font-weight:650}
h1{font-size:42px;font-weight:700;letter-spacing:-.5px}
h2{font-size:28px}
h3{font-size:19px}
p{margin:0 0 16px}
p:last-child{margin-bottom:0}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none;transition:var(--t)}
ul,ol{margin:0;padding:0;list-style:none}
button,input{font-family:inherit;font-size:inherit}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:4px}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}
.num{font-variant-numeric:tabular-nums}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 28px;border-radius:var(--r-pill);
  font-size:15px;font-weight:600;border:1px solid transparent;
  cursor:pointer;transition:var(--t);white-space:nowrap;
}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 10px 24px -12px rgba(21,87,216,.7)}
.btn-primary:hover{background:#1B63EA;transform:translateY(-1px)}
.btn-primary:active{transform:translateY(1px);box-shadow:none}
.btn-accent{background:var(--accent);color:#fff;box-shadow:0 10px 24px -12px rgba(255,107,44,.75)}
.btn-accent:hover{background:#FF7C44;transform:translateY(-1px)}
.btn-accent:active{transform:translateY(1px);box-shadow:none}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line-strong)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand);transform:translateY(-1px)}
.btn-ghost:active{transform:translateY(1px)}
.btn-sm{height:40px;padding:0 20px;font-size:14px}
.btn[disabled],.btn.is-disabled{opacity:.45;cursor:not-allowed;transform:none;box-shadow:none}
.link-arrow{display:inline-flex;align-items:center;gap:6px;color:var(--brand);font-size:15px;font-weight:600}
.link-arrow i{font-style:normal;transition:var(--t)}
.link-arrow:hover i{transform:translateX(2px)}
.link-arrow:hover{color:var(--brand-dark)}

/* ---------- 徽章 / 标签 ---------- */
.badge{
  display:inline-flex;align-items:center;height:24px;padding:0 10px;
  border-radius:var(--r-pill);background:var(--soft);color:var(--brand);
  font-size:12px;font-weight:600;line-height:1;letter-spacing:.2px;
}
.badge-green{background:var(--green-soft);color:#0B8F65}
.badge-accent{background:#FFEDE4;color:#C64D12}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.tag{
  display:inline-flex;align-items:center;height:26px;padding:0 12px;
  border-radius:var(--r-pill);border:1px solid var(--line);
  font-size:12.5px;color:var(--muted);background:#fff;
}

/* ---------- 导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:80;background:rgba(255,255,255,.96);
  backdrop-filter:saturate(180%) blur(8px);
  border-bottom:1px solid var(--line);
  transition:var(--t);
}
.site-header.scrolled{box-shadow:0 1px 0 var(--line),0 10px 28px -22px rgba(16,42,88,.35)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;gap:24px;height:72px}
.logo{display:flex;align-items:center;gap:10px;flex-shrink:0}
.logo-main{font-size:19px;font-weight:700;color:var(--ink);letter-spacing:-.2px}
.logo-sep{width:1px;height:16px;background:var(--line-strong);display:inline-block}
.logo-sub{font-size:13px;font-weight:500;color:var(--muted);letter-spacing:.5px}
.logo:hover .logo-main{color:var(--brand)}
.nav-links{display:flex;align-items:center;gap:32px}
.nav-link{
  position:relative;display:inline-block;padding:6px 0;
  font-size:15px;font-weight:500;color:var(--body);
}
.nav-link::after{
  content:"";position:absolute;left:50%;bottom:0;width:0;height:2px;
  background:var(--brand);border-radius:2px;transform:translateX(-50%);
  transition:width .2s cubic-bezier(.4,0,.2,1);
}
.nav-link:hover{color:var(--brand)}
.nav-link:hover::after{width:20px}
.nav-link.active{color:var(--brand);font-weight:600}
.nav-link.active::after{width:20px}
.nav-right{display:flex;align-items:center;gap:12px}
.nav-cta-mobile{display:none}
.nav-toggle{
  display:none;width:42px;height:42px;padding:0;border:1px solid var(--line);
  border-radius:12px;background:#fff;cursor:pointer;
  flex-direction:column;align-items:center;justify-content:center;gap:5px;
  transition:var(--t);
}
.nav-toggle span{display:block;width:18px;height:2px;border-radius:2px;background:var(--ink);transition:var(--t)}
.nav-toggle:hover{border-color:var(--line-strong)}
.nav-toggle.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.active span:nth-child(2){opacity:0}
.nav-toggle.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- 分类页首屏 ---------- */
.cat-hero{
  position:relative;overflow:hidden;
  padding:64px 0 72px;
  background:linear-gradient(180deg,#FFFFFF 0%,var(--soft) 100%);
  border-bottom:1px solid var(--line);
}
.cat-hero::before{
  content:"";position:absolute;inset:0;
  background-image:repeating-linear-gradient(135deg,rgba(21,87,216,.05) 0 1px,transparent 1px 12px);
  opacity:.7;pointer-events:none;
}
.cat-hero-grid{
  position:relative;display:grid;
  grid-template-columns:minmax(0,1.12fr) minmax(0,.88fr);
  gap:56px;align-items:center;
}
.crumb{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--muted);margin-bottom:20px;flex-wrap:wrap}
.crumb a{color:var(--muted)}
.crumb a:hover{color:var(--brand)}
.crumb .sep{color:var(--line-strong)}
.crumb-cur{color:var(--brand);font-weight:600}
.cat-hero h1{max-width:16em;margin-bottom:18px}
.lede{font-size:17px;color:var(--body);max-width:34em;margin-bottom:28px}
.hero-actions{display:flex;flex-wrap:wrap;align-items:center;gap:16px;margin-bottom:32px}
.hero-metrics{display:flex;flex-wrap:wrap;gap:28px}
.metric{display:flex;flex-direction:column;gap:2px;padding-left:14px;border-left:2px solid var(--line-strong)}
.metric strong{font-size:18px;color:var(--ink);font-weight:650}
.metric span{font-size:13px;color:var(--muted)}
.cat-hero-media{position:relative}
.cat-hero-media img{
  width:100%;aspect-ratio:4/3;object-fit:cover;
  border-radius:var(--r-lg);border:1px solid var(--line);
  box-shadow:var(--sh-1);background:var(--soft);
  transform:rotate(-2deg);
}
.float-card{
  position:absolute;left:-14px;bottom:24px;
  background:#fff;border:1px solid var(--line);border-radius:var(--r-md);
  box-shadow:var(--sh-2);padding:14px 18px;min-width:180px;
}
.float-card .fc-label{font-size:12px;color:var(--muted);display:block;margin-bottom:4px}
.float-card .fc-value{font-size:15px;font-weight:650;color:var(--ink)}
.float-card .fc-dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--green);margin-right:6px;vertical-align:middle}

/* ---------- 通用板块 ---------- */
.section{padding:88px 0}
.section-soft{background:var(--bg)}
.section-head{max-width:760px;margin-bottom:44px}
.section-head h2{position:relative;padding-left:16px;margin-bottom:14px}
.section-head h2::before{
  content:"";position:absolute;left:0;top:7px;bottom:7px;width:3px;
  border-radius:2px;background:var(--brand);
}
.section-sub{font-size:16px;color:var(--body);max-width:44em}
.section-head-row{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;flex-wrap:wrap;margin-bottom:44px}
.section-head-row .section-head{margin-bottom:0}

/* ---------- 步骤时间轴 ---------- */
.timeline{max-width:900px}
.tl-item{position:relative;padding:0 0 32px 84px}
.tl-item:last-child{padding-bottom:0}
.tl-item::before{
  content:"";position:absolute;left:27px;top:60px;bottom:4px;width:1px;background:var(--line);
}
.tl-item:last-child::before{display:none}
.tl-num{
  position:absolute;left:0;top:0;width:56px;height:56px;border-radius:50%;
  border:2px solid var(--brand);background:#fff;color:var(--brand);
  display:grid;place-items:center;font-size:17px;font-weight:700;
  font-variant-numeric:tabular-nums;z-index:1;
}
.tl-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r-md);
  padding:24px 26px;box-shadow:var(--sh-1);transition:var(--t);
}
.tl-card:hover{transform:translateY(-2px);border-color:var(--line-strong);box-shadow:var(--sh-2)}
.tl-card h3{margin-bottom:8px;font-size:18px}
.tl-card p{font-size:15px;color:var(--body)}

/* ---------- 下载渠道卡 ---------- */
.channel-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:32px}
.channel-card{
  display:flex;flex-direction:column;background:var(--card);
  border:1px solid var(--line);border-radius:var(--r-md);
  overflow:hidden;box-shadow:var(--sh-1);transition:var(--t);
}
.channel-card:hover{transform:translateY(-2px);box-shadow:var(--sh-2);border-color:var(--line-strong)}
.channel-media{background:var(--soft);position:relative}
.channel-media img{width:100%;aspect-ratio:16/10;object-fit:cover}
.channel-body{padding:26px 28px 28px;display:flex;flex-direction:column;gap:12px;flex:1}
.channel-body h3{font-size:20px}
.channel-body p{font-size:15px}
.check-list{display:flex;flex-direction:column;gap:8px;margin:4px 0 6px}
.check-list li{position:relative;padding-left:22px;font-size:14.5px;color:var(--body)}
.check-list li::before{
  content:"";position:absolute;left:0;top:9px;width:8px;height:8px;border-radius:50%;
  background:var(--brand-soft);border:2px solid var(--brand);
}

/* ---------- 规格清单 ---------- */
.spec-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.spec-list{
  margin:0;background:#fff;border:1px solid var(--line);border-radius:var(--r-md);
  padding:8px 26px;box-shadow:var(--sh-1);
}
.spec-row{
  display:grid;grid-template-columns:132px minmax(0,1fr);gap:18px;
  padding:16px 0;border-bottom:1px solid var(--line);align-items:baseline;
}
.spec-row:last-child{border-bottom:none}
.spec-row dt{font-size:14px;color:var(--muted)}
.spec-row dd{margin:0;font-size:15.5px;color:var(--ink);font-weight:500}

/* ---------- 异常排查列表 ---------- */
.trouble-list{display:flex;flex-direction:column;gap:14px;max-width:920px}
.trouble-item{
  background:#fff;border:1px solid var(--line);border-left:3px solid var(--accent);
  border-radius:var(--r-sm);padding:20px 24px;box-shadow:var(--sh-1);transition:var(--t);
}
.trouble-item:hover{transform:translateX(2px);border-color:var(--line-strong);border-left-color:var(--accent-dark)}
.trouble-item h3{font-size:17px;margin-bottom:6px}
.trouble-item p{font-size:15px}
.trouble-item code{
  font-family:inherit;background:var(--soft);color:var(--brand);
  padding:1px 7px;border-radius:6px;font-size:14px;
}

/* ---------- FAQ ---------- */
.faq-wrap{max-width:820px;display:flex;flex-direction:column;gap:12px}
.faq-item{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-md);
  box-shadow:var(--sh-1);overflow:hidden;transition:var(--t);
}
.faq-item[open]{border-color:var(--line-strong);box-shadow:var(--sh-2)}
.faq-q{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:20px 24px;font-size:16px;font-weight:600;color:var(--ink);
  cursor:pointer;list-style:none;
}
.faq-q::-webkit-details-marker{display:none}
.faq-q::after{
  content:"";flex-shrink:0;width:16px;height:16px;
  background:
    linear-gradient(var(--brand),var(--brand)) center/16px 2px no-repeat,
    linear-gradient(var(--brand),var(--brand)) center/2px 16px no-repeat;
  transition:transform .2s cubic-bezier(.4,0,.2,1);
}
.faq-item[open] .faq-q::after{transform:rotate(45deg)}
.faq-q:hover{color:var(--brand)}
.faq-a{padding:0 24px 22px;font-size:15px;color:var(--body)}
.faq-a p{margin-bottom:10px}

/* ---------- 底部 CTA ---------- */
.cta-band{
  position:relative;overflow:hidden;
  background:var(--soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  padding:56px 0;
}
.cta-band::before{
  content:"";position:absolute;inset:0;
  background-image:repeating-linear-gradient(135deg,rgba(21,87,216,.05) 0 1px,transparent 1px 12px);
  pointer-events:none;
}
.cta-inner{
  position:relative;display:flex;align-items:center;justify-content:space-between;
  gap:32px;flex-wrap:wrap;
}
.cta-inner h2{font-size:24px;margin-bottom:8px}
.cta-inner p{font-size:15px;margin:0}
.cta-actions{display:flex;gap:14px;flex-wrap:wrap}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--bg);border-top:1px solid var(--line);padding:64px 0 0}
.footer-grid{
  display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px;
  padding-bottom:44px;
}
.footer-brand .logo{margin-bottom:16px}
.footer-brand p{font-size:14px;color:var(--body);max-width:32em}
.footer-col h4{font-size:15px;margin-bottom:16px;color:var(--ink)}
.footer-col ul{display:flex;flex-direction:column;gap:10px}
.footer-col li a{font-size:14px;color:var(--body)}
.footer-col li a:hover{color:var(--brand)}
.footer-col p{font-size:13px;color:var(--muted);line-height:1.9}
.footer-bottom{
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  border-top:1px solid var(--line);padding:20px 0 28px;
  font-size:13px;color:var(--muted);
}

/* ---------- 响应式 ---------- */
@media (max-width:1199px){
  .cat-hero-grid{gap:40px}
}
@media (max-width:991px){
  h1{font-size:32px}
  h2{font-size:23px}
  .section{padding:64px 0}
  .cat-hero{padding:44px 0 56px}
  .cat-hero-grid{grid-template-columns:1fr;gap:36px}
  .cat-hero-media img{transform:none;aspect-ratio:16/10}
  .float-card{left:14px;bottom:14px}
  .channel-grid{grid-template-columns:1fr}
  .spec-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .nav-toggle{display:flex}
  .nav-right > .btn{display:none}
  .nav-cta-mobile{display:inline-flex !important;margin-top:18px;align-self:flex-start}
  .nav-links{
    position:fixed;left:0;right:0;top:73px;
    flex-direction:column;align-items:stretch;gap:0;
    background:#fff;border-bottom:1px solid var(--line);
    padding:8px 24px 24px;max-height:calc(100vh - 73px);overflow-y:auto;
    opacity:0;visibility:hidden;pointer-events:none;transform:translateY(-12px);
    transition:var(--t);box-shadow:0 24px 40px -30px rgba(16,42,88,.5);
  }
  .nav-links.open{opacity:1;visibility:visible;pointer-events:auto;transform:none}
  .nav-link{padding:16px 0;border-bottom:1px solid var(--line);font-size:16px}
  .nav-link::after{display:none}
}
@media (max-width:559px){
  .container{padding:0 20px}
  h1{font-size:28px}
  h2{font-size:22px}
  .section{padding:48px 0}
  .cat-hero{padding:32px 0 44px}
  .lede{font-size:15.5px}
  .btn{height:46px;padding:0 22px;font-size:14.5px}
  .btn-sm{height:38px;padding:0 18px}
  .hero-metrics{gap:20px}
  .metric strong{font-size:16px}
  .tl-item{padding-left:64px;padding-bottom:26px}
  .tl-item::before{left:21px;top:48px}
  .tl-num{width:44px;height:44px;font-size:15px;border-width:2px}
  .tl-card{padding:20px}
  .spec-list{padding:4px 20px}
  .spec-row{grid-template-columns:1fr;gap:2px;padding:14px 0}
  .spec-row dd{font-size:15px}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .cta-inner{flex-direction:column;align-items:flex-start}
  .faq-q{padding:16px 18px;font-size:15px}
  .faq-a{padding:0 18px 18px}
  .trouble-item{padding:18px 18px}
}

/* roulang page: category2 */
:root{
  --brand:#1557D8;
  --brand-soft:#EEF3FB;
  --brand-line:#CFDCF2;
  --accent:#FF6B2C;
  --ok:#12B981;
  --title:#0E1726;
  --text:#4A5A72;
  --muted:#8794A8;
  --line:#E8EDF5;
  --bg:#F5F8FC;
  --card:#FFFFFF;
  --radius-s:8px;
  --radius-m:14px;
  --radius-l:20px;
  --pill:999px;
  --shadow-1:0 1px 2px rgba(16,42,88,.06),0 12px 32px -12px rgba(16,42,88,.14);
  --shadow-2:0 2px 6px rgba(16,42,88,.08),0 18px 40px -14px rgba(16,42,88,.22);
  --ease:cubic-bezier(.4,0,.2,1);
  --sp-4:4px;--sp-8:8px;--sp-12:12px;--sp-16:16px;--sp-24:24px;--sp-32:32px;--sp-48:48px;--sp-64:64px;--sp-88:88px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.8;
  color:var(--text);
  background:#fff;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4{margin:0;color:var(--title);font-weight:650;line-height:1.35}
h1{font-size:42px;font-weight:700;line-height:1.28}
h2{font-size:28px}
h3{font-size:20px}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
img{max-width:100%;display:block;border-style:none}
a{color:inherit;text-decoration:none;transition:all .2s var(--ease)}
button{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:4px}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
.section{padding:88px 0}
.section-alt{background:var(--bg);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{margin-bottom:40px;max-width:820px}
.section-title{position:relative;padding-left:16px;font-size:28px}
.section-title::before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:4px;height:22px;border-radius:2px;background:var(--brand)}
.section-desc{margin-top:14px;font-size:15.5px;color:var(--muted);max-width:760px}
.num{font-variant-numeric:tabular-nums}

/* ---------- Header / Nav ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(255,255,255,.94);
  backdrop-filter:saturate(180%) blur(10px);
  border-bottom:1px solid transparent;
  transition:all .2s var(--ease);
}
.site-header.scrolled{border-bottom-color:var(--line)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;gap:24px;height:72px}
.logo{display:inline-flex;align-items:baseline;gap:8px;white-space:nowrap}
.logo-main{font-size:19px;font-weight:700;color:var(--title);letter-spacing:.4px}
.logo-sep{width:1px;height:14px;background:var(--line);transform:translateY(-2px)}
.logo-sub{font-size:13px;font-weight:400;color:var(--muted);letter-spacing:.6px}
.logo:hover .logo-main{color:var(--brand)}
.nav-links{display:flex;align-items:center;gap:32px;margin-left:auto}
.nav-link{position:relative;font-size:15px;font-weight:500;color:var(--text);padding:6px 0}
.nav-link::after{content:"";position:absolute;left:50%;bottom:0;width:0;height:2px;border-radius:2px;background:var(--brand);transform:translateX(-50%);transition:width .2s var(--ease)}
.nav-link:hover{color:var(--brand)}
.nav-link:hover::after{width:20px}
.nav-link.active{color:var(--brand);font-weight:600}
.nav-link.active::after{width:20px}
.nav-right{display:flex;align-items:center;gap:12px}
.nav-toggle{display:none;flex-direction:column;justify-content:center;align-items:center;gap:4px;width:42px;height:42px;border:1px solid var(--line);border-radius:10px;background:#fff;cursor:pointer}
.nav-toggle span{display:block;width:18px;height:1.5px;border-radius:2px;background:var(--title);transition:all .2s var(--ease)}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:48px;padding:0 28px;border-radius:var(--pill);border:1px solid transparent;font-size:15px;font-weight:600;cursor:pointer;white-space:nowrap;transition:all .2s var(--ease)}
.btn-sm{height:40px;padding:0 20px;font-size:14px}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 10px 24px -12px rgba(21,87,216,.75)}
.btn-primary:hover{filter:brightness(1.06);transform:translateY(-1px)}
.btn-accent{background:var(--accent);color:#fff;box-shadow:0 10px 22px -10px rgba(255,107,44,.75)}
.btn-accent:hover{filter:brightness(1.06);transform:translateY(-1px)}
.btn-accent:active,.btn-primary:active{transform:translateY(1px);box-shadow:none}
.btn-ghost{background:#fff;color:var(--title);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--brand-line);color:var(--brand);transform:translateY(-1px)}
.btn-link{display:inline-flex;align-items:center;gap:6px;font-size:15px;font-weight:600;color:var(--brand);height:auto;padding:0;border:0;background:none}
.btn-link .arrow{transition:transform .2s var(--ease)}
.btn-link:hover .arrow{transform:translateX(2px)}

/* ---------- Badges ---------- */
.badge{display:inline-flex;align-items:center;height:24px;padding:0 12px;border-radius:var(--pill);background:var(--brand-soft);color:var(--brand);font-size:12px;font-weight:600;letter-spacing:.2px}
.badge-ok{background:rgba(18,185,129,.12);color:#0E8F66}
.badge-accent{background:rgba(255,107,44,.12);color:#D9531B}

/* ---------- Hero ---------- */
.page-hero{position:relative;overflow:hidden;padding:72px 0 68px;background:linear-gradient(180deg,#FFFFFF 0%,#F5F8FC 100%);border-bottom:1px solid var(--line)}
.page-hero-bg{position:absolute;inset:0;background-image:url('/assets/images/backpic/back-2.png');background-size:cover;background-position:center;opacity:.08;pointer-events:none}
.page-hero-pattern{position:absolute;inset:0;pointer-events:none;opacity:.04;background-image:repeating-linear-gradient(135deg,#1557D8 0 1px,transparent 1px 14px)}
.page-hero-inner{position:relative;z-index:1;display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.breadcrumb{display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-size:13.5px;color:var(--muted);margin-bottom:18px}
.breadcrumb a:hover{color:var(--brand)}
.breadcrumb .sep{color:#C3CEDE}
.breadcrumb .current{color:var(--brand);font-weight:600}
.hero-tag{margin-bottom:16px}
.hero-lead{margin-top:18px;font-size:16.5px;line-height:1.85;color:var(--text);max-width:560px}
.hero-actions{margin-top:28px;display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.hero-points{margin-top:30px;display:flex;gap:28px;flex-wrap:wrap}
.hero-point{display:inline-flex;align-items:center;gap:8px;font-size:14px;color:var(--muted)}
.hero-point i{width:6px;height:6px;border-radius:50%;background:var(--brand);display:inline-block}
.hero-point.ok i{background:var(--ok)}
.page-hero-media{position:relative}
.page-hero-media img{width:100%;aspect-ratio:16/11;object-fit:cover;border-radius:var(--radius-l);border:1px solid var(--line);box-shadow:var(--shadow-2);transform:rotate(-1.2deg);background:var(--brand-soft)}
.float-card{position:absolute;left:-14px;bottom:-20px;display:flex;align-items:center;gap:14px;padding:14px 18px;background:#fff;border:1px solid var(--line);border-radius:var(--radius-m);box-shadow:var(--shadow-2)}
.float-card .fc-label{font-size:12px;color:var(--muted);line-height:1.5}
.float-card .fc-value{font-size:15px;font-weight:650;color:var(--title);line-height:1.5}

/* ---------- Feature cards ---------- */
.feature-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.feature-card{display:flex;flex-direction:column;background:var(--card);border:1px solid var(--line);border-radius:var(--radius-m);box-shadow:var(--shadow-1);overflow:hidden;transition:all .2s var(--ease)}
.feature-card:hover{transform:translateY(-2px);border-color:var(--brand-line);box-shadow:var(--shadow-2)}
.card-media{aspect-ratio:16/10;overflow:hidden;background:var(--brand-soft)}
.card-media img{width:100%;height:100%;object-fit:cover;transition:transform .45s var(--ease)}
.feature-card:hover .card-media img{transform:scale(1.04)}
.card-body{padding:22px 24px 22px;display:flex;flex-direction:column;flex:1}
.card-body h3{font-size:18px}
.card-body p{margin-top:10px;font-size:14.5px;line-height:1.8;color:var(--text)}
.card-meta{margin-top:auto;padding-top:16px;display:flex;align-items:center;justify-content:space-between;gap:12px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}
.card-meta .arrow{color:var(--brand);font-weight:600}
.feature-card:hover .card-meta .arrow{transform:translateX(2px)}
.card-meta .arrow{transition:transform .2s var(--ease)}

/* ---------- Specs layout ---------- */
.spec-layout{display:grid;grid-template-columns:.9fr 1.1fr;gap:48px;align-items:start}
.spec-aside h2{margin-bottom:16px}
.spec-aside p{font-size:15.5px;line-height:1.85}
.spec-figure{margin-top:26px;border-radius:var(--radius-l);overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow-1);background:var(--brand-soft)}
.spec-figure img{width:100%;aspect-ratio:16/10;object-fit:cover}
.spec-caption{margin-top:12px;font-size:13px;color:var(--muted);text-align:center}
.spec-cards{display:grid;gap:20px}
.spec-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius-m);box-shadow:var(--shadow-1);padding:4px 24px 6px}
.spec-card-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:18px 0 6px;border-bottom:1px solid var(--line)}
.spec-card-head h3{font-size:17px}
.spec-row{display:grid;grid-template-columns:132px 1fr;gap:16px;align-items:baseline;padding:15px 0;border-bottom:1px solid var(--line)}
.spec-row:last-child{border-bottom:0}
.spec-name{font-size:14px;color:var(--muted)}
.spec-value{font-size:16px;font-weight:500;color:var(--title);font-variant-numeric:tabular-nums}
.spec-foot{margin-top:22px;display:flex;align-items:center;gap:18px;flex-wrap:wrap}

/* ---------- Perf list ---------- */
.perf-list{border-top:1px solid var(--line)}
.perf-item{display:grid;grid-template-columns:72px 1fr auto;gap:24px;align-items:center;padding:26px 0;border-bottom:1px solid var(--line);transition:all .2s var(--ease)}
.perf-item:hover{padding-left:8px}
.perf-num{font-size:28px;font-weight:700;line-height:1;color:#C9DAF6;font-variant-numeric:tabular-nums;transition:color .2s var(--ease)}
.perf-item:hover .perf-num{color:var(--brand)}
.perf-item h3{font-size:17px;margin-bottom:6px}
.perf-item p{font-size:14.5px;color:var(--muted)}
.perf-tag{white-space:nowrap}

/* ---------- Update list ---------- */
.update-list{border-top:1px solid var(--line)}
.update-item{display:grid;grid-template-columns:120px 1fr auto;gap:24px;align-items:center;padding:22px 0;border-bottom:1px solid var(--line);transition:all .2s var(--ease)}
.update-item:hover{background:#FAFCFF}
.update-date{font-size:14px;color:var(--muted);font-variant-numeric:tabular-nums}
.update-item h3{font-size:17px;margin-bottom:6px}
.update-item h3 a:hover{color:var(--brand)}
.update-item p{font-size:14px;color:var(--muted)}
.update-more{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--brand);white-space:nowrap}
.update-more:hover .arrow{transform:translateX(2px)}
.update-more .arrow{transition:transform .2s var(--ease)}

/* ---------- FAQ ---------- */
.faq{display:grid;gap:12px;max-width:820px;margin:0 auto}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:var(--radius-m);box-shadow:var(--shadow-1);padding:0 22px;transition:all .2s var(--ease)}
.faq-item:hover{border-color:var(--brand-line)}
.faq-item summary{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 0;font-size:16px;font-weight:600;color:var(--title);cursor:pointer;list-style:none}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:20px;line-height:1;color:var(--brand);transition:transform .2s var(--ease)}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-body{padding:0 0 20px;font-size:15px;line-height:1.85;color:var(--text);border-top:1px solid var(--line);padding-top:16px}

/* ---------- CTA band ---------- */
.cta-band{position:relative;overflow:hidden;background:var(--brand-soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:56px 0}
.cta-band-bg{position:absolute;inset:0;background-image:url('/assets/images/backpic/back-3.png');background-size:cover;background-position:center;opacity:.09;pointer-events:none}
.cta-band-pattern{position:absolute;inset:0;pointer-events:none;opacity:.04;background-image:repeating-linear-gradient(135deg,#1557D8 0 1px,transparent 1px 14px)}
.cta-inner{position:relative;z-index:1;display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap}
.cta-inner h2{font-size:24px}
.cta-inner p{margin-top:10px;font-size:15px;color:var(--text);max-width:620px}
.cta-actions{display:flex;gap:14px;flex-wrap:wrap}

/* ---------- Back home ---------- */
.back-home{padding:44px 0 76px;text-align:center}

/* ---------- Footer ---------- */
.site-footer{background:var(--bg);border-top:1px solid var(--line)}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:32px;padding:64px 0 40px}
.footer-brand p{margin-top:16px;font-size:14px;line-height:1.85;color:var(--muted);max-width:330px}
.footer-col h4{font-size:14px;color:var(--title);margin-bottom:16px;font-weight:650}
.footer-col li{margin-bottom:10px;font-size:14px;color:var(--text)}
.footer-col li a:hover{color:var(--brand)}
.footer-col p{font-size:14px;line-height:1.85;color:var(--muted)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;padding:20px 0 34px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}

/* ---------- Responsive ---------- */
@media (max-width:1199px){
  h1{font-size:36px}
  .page-hero-inner{gap:36px}
  .spec-layout{gap:32px}
}
@media (max-width:991px){
  .nav-toggle{display:flex}
  .nav-links{
    position:fixed;left:0;right:0;top:72px;bottom:0;
    flex-direction:column;align-items:stretch;gap:0;
    margin:0;padding:16px 20px 40px;
    background:#fff;border-top:1px solid var(--line);
    overflow-y:auto;z-index:90;
    opacity:0;visibility:hidden;transform:translateY(-8px);pointer-events:none;
    transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s;
  }
  .nav-links.open{opacity:1;visibility:visible;transform:none;pointer-events:auto}
  .nav-link{font-size:16px;padding:16px 0;border-bottom:1px solid var(--line)}
  .nav-link::after{display:none}
  .nav-link.active{color:var(--brand)}
  .nav-links.open .nav-cta-mobile{display:inline-flex !important;margin-top:22px;align-self:flex-start}
  .section{padding:64px 0}
  .page-hero{padding:56px 0 52px}
  .page-hero-inner{grid-template-columns:1fr;gap:36px}
  .page-hero-media img{transform:none;aspect-ratio:16/9}
  .float-card{position:static;margin-top:16px;left:auto;bottom:auto}
  .spec-layout{grid-template-columns:1fr;gap:32px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px 24px;padding:48px 0 32px}
  .footer-brand{grid-column:1 / -1}
}
@media (max-width:767px){
  h1{font-size:29px}
  h2{font-size:22px}
  .section{padding:52px 0}
  .feature-grid{grid-template-columns:1fr}
  .perf-item{grid-template-columns:52px 1fr;gap:16px;padding:20px 0}
  .perf-tag{grid-column:2;justify-self:start}
  .update-item{grid-template-columns:1fr;gap:8px;padding:20px 0}
  .section-title{font-size:22px}
  .cta-inner{flex-direction:column;align-items:flex-start}
  .nav-wrap{height:66px}
  .nav-links{top:66px}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
}
@media (max-width:559px){
  body{font-size:15.5px}
  h1{font-size:26px}
  .hero-lead{font-size:15.5px}
  .btn{width:100%;padding:0 20px}
  .hero-actions .btn{width:100%}
  .hero-actions .btn-link{width:auto;justify-content:flex-start}
  .cta-actions{width:100%}
  .spec-card{padding:4px 18px 6px}
  .spec-row{grid-template-columns:1fr;gap:4px}
  .footer-grid{grid-template-columns:1fr}
  .card-body{padding:20px 18px}
}

/* roulang page: category3 */
:root{
  --brand:#1557D8;
  --brand-dark:#1249bd;
  --accent:#FF6B2C;
  --accent-dark:#f05f20;
  --mint:#12B981;
  --title:#0E1726;
  --text:#4A5A72;
  --muted:#8794A8;
  --line:#E8EDF5;
  --line-strong:#CFDCF2;
  --bg:#F5F8FC;
  --soft:#EEF3FB;
  --card:#FFFFFF;
  --radius-sm:8px;
  --radius-md:14px;
  --radius-lg:20px;
  --shadow-1:0 1px 2px rgba(16,42,88,.06), 0 12px 32px -12px rgba(16,42,88,.14);
  --shadow-2:0 2px 6px rgba(16,42,88,.08), 0 18px 40px -14px rgba(16,42,88,.20);
  --ease:all .2s cubic-bezier(.4,0,.2,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.8;
  color:var(--text);
  background:#fff;
}
body.nav-open{overflow:hidden}
h1,h2,h3,h4{margin:0;color:var(--title);line-height:1.35;font-weight:650}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none;transition:var(--ease)}
button{font:inherit;cursor:pointer;border:none;background:none;color:inherit}
input{font:inherit}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
.narrow{max-width:760px;margin:0 auto}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(255,255,255,.94);
  backdrop-filter:saturate(180%) blur(10px);
  border-bottom:1px solid transparent;
  transition:var(--ease);
}
.site-header.is-scrolled{border-bottom-color:var(--line)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;gap:24px;height:72px}
.logo{display:inline-flex;align-items:center;gap:10px;flex-shrink:0}
.logo-main{font-size:19px;font-weight:700;color:var(--title);letter-spacing:.5px}
.logo-sep{width:1px;height:16px;background:var(--line-strong)}
.logo-sub{font-size:14px;color:var(--muted);font-weight:400;letter-spacing:.4px}
.logo:hover .logo-main{color:var(--brand)}
.nav-links{display:flex;align-items:center;gap:32px}
.nav-link{position:relative;padding:8px 0;font-size:15px;font-weight:500;color:var(--text);white-space:nowrap}
.nav-link::after{
  content:"";position:absolute;left:50%;bottom:2px;transform:translateX(-50%);
  width:0;height:2px;border-radius:2px;background:var(--brand);transition:var(--ease);
}
.nav-link:hover{color:var(--brand)}
.nav-link:hover::after,.nav-link.active::after{width:20px}
.nav-link.active{color:var(--brand);font-weight:600}
.nav-right{display:flex;align-items:center;gap:12px}
.nav-toggle{
  display:none;width:44px;height:44px;border:1px solid var(--line);border-radius:12px;
  background:#fff;flex-direction:column;align-items:center;justify-content:center;gap:5px;
  transition:var(--ease);
}
.nav-toggle:hover{border-color:var(--line-strong)}
.nav-toggle span{display:block;width:18px;height:2px;border-radius:2px;background:var(--title);transition:var(--ease)}
.nav-toggle.is-active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.is-active span:nth-child(2){opacity:0}
.nav-toggle.is-active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 28px;border-radius:999px;border:1px solid transparent;
  font-size:15px;font-weight:600;white-space:nowrap;transition:var(--ease);
}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-dark);transform:translateY(-1px);box-shadow:0 12px 32px -12px rgba(21,87,216,.55)}
.btn-accent{background:var(--accent);color:#fff}
.btn-accent:hover{background:var(--accent-dark);transform:translateY(-1px);box-shadow:0 12px 32px -12px rgba(255,107,44,.55)}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--title)}
.btn-ghost:hover{border-color:var(--line-strong);color:var(--brand);transform:translateY(-1px)}
.btn:active{transform:translateY(1px);box-shadow:none}
.btn-sm{height:40px;padding:0 20px;font-size:14px}
.link-arrow{display:inline-flex;align-items:center;gap:6px;color:var(--brand);font-weight:600;font-size:15px}
.link-arrow .arw{transition:var(--ease)}
.link-arrow:hover .arw{transform:translateX(3px)}

/* ---------- badges ---------- */
.badge{
  display:inline-flex;align-items:center;gap:6px;height:26px;padding:0 12px;
  border-radius:999px;background:var(--soft);color:var(--brand);
  font-size:12px;font-weight:600;letter-spacing:.2px;white-space:nowrap;
}
.badge-ok{background:#E6F7F1;color:#0E8F66}
.badge-warn{background:#FFF1E9;color:#C74E12}

/* ---------- hero ---------- */
.page-hero{
  position:relative;overflow:hidden;
  padding:52px 0 68px;
  background:linear-gradient(180deg,#FFFFFF 0%,#EEF3FB 100%);
}
.page-hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:repeating-linear-gradient(135deg,rgba(21,87,216,.05) 0 1px,transparent 1px 13px);
}
.page-hero .container{position:relative;z-index:2}
.crumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:14px;color:var(--muted);margin-bottom:22px}
.crumb a{color:var(--muted)}
.crumb a:hover{color:var(--brand)}
.crumb .sep{color:#C6D1E1}
.crumb .now{color:var(--brand);font-weight:600}
.page-hero h1{
  font-size:42px;font-weight:700;letter-spacing:-.5px;max-width:900px;
}
.page-hero .lead{margin-top:18px;font-size:17px;max-width:720px;color:var(--text)}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px;align-items:center}

/* ---------- section ---------- */
.section{padding:88px 0}
.section-soft{background:var(--bg)}
.section-line{border-top:1px solid var(--line)}
.section-head{max-width:760px;margin-bottom:44px}
.section-head h2{font-size:28px;font-weight:650;position:relative;padding-left:16px}
.section-head h2::before{
  content:"";position:absolute;left:0;top:6px;bottom:6px;width:3px;border-radius:3px;background:var(--brand);
}
.section-head p{margin-top:14px;font-size:16px}
.section-head.has-aside{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;max-width:none}

/* ---------- qa layout ---------- */
.qa-layout{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:48px;align-items:start}
.qa-group{margin-bottom:36px}
.qa-group:last-child{margin-bottom:0}
.qa-group-title{
  display:flex;align-items:center;gap:10px;font-size:20px;font-weight:650;margin-bottom:16px;
}
.qa-group-title::before{
  content:"";width:8px;height:8px;border-radius:50%;background:var(--brand);flex:0 0 8px;
}
.qa-group-title small{font-size:13px;color:var(--muted);font-weight:400}
.qa-item{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius-md);
  box-shadow:var(--shadow-1);margin-bottom:12px;overflow:hidden;transition:var(--ease);
}
.qa-item:hover{border-color:var(--line-strong);box-shadow:var(--shadow-2)}
.qa-item summary{
  list-style:none;cursor:pointer;display:flex;align-items:flex-start;justify-content:space-between;
  gap:16px;padding:18px 20px;font-size:16px;font-weight:600;color:var(--title);line-height:1.6;
}
.qa-item summary::-webkit-details-marker{display:none}
.qa-item summary:hover{color:var(--brand)}
.qa-icon{
  position:relative;flex:0 0 20px;width:20px;height:20px;border-radius:999px;
  background:var(--soft);transition:var(--ease);margin-top:3px;
}
.qa-icon::before,.qa-icon::after{content:"";position:absolute;left:50%;top:50%;background:var(--brand);border-radius:2px}
.qa-icon::before{width:10px;height:2px;transform:translate(-50%,-50%)}
.qa-icon::after{width:2px;height:10px;transform:translate(-50%,-50%)}
.qa-item[open] .qa-icon{transform:rotate(45deg);background:#E1ECFD}
.qa-body{
  padding:16px 20px 20px;border-top:1px solid var(--line);
  font-size:15px;line-height:1.9;color:var(--text);
}
.qa-body p+p{margin-top:12px}
.qa-body ul{margin-top:10px}
.qa-body ul li{position:relative;padding-left:18px;margin-bottom:6px}
.qa-body ul li::before{
  content:"";position:absolute;left:2px;top:11px;width:6px;height:6px;border-radius:50%;
  background:var(--brand);opacity:.7;
}
.qa-body strong{color:var(--title);font-weight:600}

/* ---------- aside ---------- */
.side-stack{display:flex;flex-direction:column;gap:20px;position:sticky;top:96px}
.side-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius-md);
  box-shadow:var(--shadow-1);padding:22px;
}
.side-card h3{font-size:17px;font-weight:650;margin-bottom:12px}
.side-card p{font-size:14px;line-height:1.85;color:var(--text)}
.side-card .side-list{margin-top:6px}
.side-card .side-list li{
  display:flex;align-items:center;gap:10px;padding:9px 0;font-size:14px;border-bottom:1px dashed var(--line);
}
.side-card .side-list li:last-child{border-bottom:none}
.side-card .side-list .num{
  flex:0 0 22px;height:22px;border-radius:50%;border:1px solid var(--line-strong);
  color:var(--brand);font-size:12px;font-weight:600;display:inline-flex;align-items:center;justify-content:center;
}
.side-figure{
  border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--line);
  background:var(--soft);aspect-ratio:16/10;
}
.side-figure img{width:100%;height:100%;object-fit:cover}
.side-note{font-size:13px;color:var(--muted);margin-top:12px;line-height:1.7}
.side-cta{margin-top:16px;display:flex}

/* ---------- check grid ---------- */
.check-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}
.check-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius-md);
  padding:22px 20px;box-shadow:var(--shadow-1);transition:var(--ease);
}
.check-card:hover{transform:translateY(-2px);border-color:var(--line-strong);box-shadow:var(--shadow-2)}
.check-ico{
  width:42px;height:42px;border-radius:12px;background:var(--soft);color:var(--brand);
  display:flex;align-items:center;justify-content:center;margin-bottom:14px;
}
.check-card h3{font-size:17px;font-weight:650;margin-bottom:8px}
.check-card p{font-size:14px;line-height:1.8;color:var(--text)}

/* ---------- steps / prepare ---------- */
.prepare{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:52px;align-items:center}
.prepare-list{counter-reset:prep}
.prepare-list li{
  display:flex;gap:20px;padding:22px 0;border-bottom:1px solid var(--line);
}
.prepare-list li:first-child{padding-top:0}
.prepare-list li:last-child{border-bottom:none;padding-bottom:0}
.prepare-num{
  font-size:30px;font-weight:700;color:#C7D9F7;line-height:1;
  font-variant-numeric:tabular-nums;flex:0 0 auto;min-width:44px;
}
.prepare-list h3{font-size:17px;font-weight:650;margin-bottom:6px}
.prepare-list p{font-size:14.5px;line-height:1.85}
.prepare-figure{
  border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--line);
  background:var(--soft);aspect-ratio:4/3;box-shadow:var(--shadow-1);
}
.prepare-figure img{width:100%;height:100%;object-fit:cover}

/* ---------- cta band ---------- */
.cta-band{
  position:relative;overflow:hidden;background:var(--soft);border-top:1px solid var(--line);
}
.cta-band::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:repeating-linear-gradient(135deg,rgba(21,87,216,.05) 0 1px,transparent 1px 13px);
}
.cta-band .container{position:relative;z-index:2}
.cta-inner{
  display:flex;align-items:center;justify-content:space-between;gap:32px;
  padding:52px 0;
}
.cta-inner h2{font-size:26px;font-weight:650}
.cta-inner p{margin-top:10px;font-size:15px;max-width:620px}
.cta-actions{display:flex;gap:14px;flex-wrap:wrap;flex:0 0 auto}

/* ---------- footer ---------- */
.site-footer{background:var(--bg);border-top:1px solid var(--line);padding-top:64px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.3fr;gap:40px}
.footer-brand .logo{margin-bottom:16px}
.footer-brand p{font-size:14px;line-height:1.9;color:var(--text);max-width:320px}
.footer-col h4{font-size:15px;font-weight:650;margin-bottom:16px;color:var(--title)}
.footer-col ul li{margin-bottom:10px}
.footer-col ul li a{font-size:14px;color:var(--text)}
.footer-col ul li a:hover{color:var(--brand)}
.footer-col p{font-size:13.5px;line-height:1.9;color:var(--text)}
.footer-bottom{
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  margin-top:52px;padding:20px 0;border-top:1px solid var(--line);
  font-size:13px;color:var(--muted);
}

/* ---------- responsive ---------- */
@media (max-width:1199px){
  .qa-layout{grid-template-columns:minmax(0,1fr) 300px;gap:36px}
  .check-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:991px){
  .nav-toggle{display:flex}
  .nav-right .btn{display:none}
  .nav-links{
    position:fixed;top:72px;left:0;right:0;bottom:0;z-index:70;
    background:#fff;flex-direction:column;align-items:stretch;gap:0;
    padding:8px 20px 40px;overflow-y:auto;
    transform:translateY(-10px);opacity:0;pointer-events:none;transition:var(--ease);
  }
  .nav-links.is-open{transform:none;opacity:1;pointer-events:auto}
  .nav-link{display:block;padding:16px 0;border-bottom:1px solid var(--line);font-size:16px}
  .nav-link::after{display:none}
  .nav-link.active{color:var(--brand)}
  .nav-cta-mobile{display:inline-flex !important;margin-top:24px;width:100%}
  .section{padding:64px 0}
  .page-hero{padding:40px 0 52px}
  .page-hero h1{font-size:32px}
  .page-hero .lead{font-size:16px}
  .qa-layout{grid-template-columns:1fr;gap:32px}
  .side-stack{position:static}
  .prepare{grid-template-columns:1fr;gap:32px}
  .prepare-figure{aspect-ratio:16/10}
  .cta-inner{flex-direction:column;align-items:flex-start;padding:44px 0}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .section-head.has-aside{flex-direction:column;align-items:flex-start}
}
@media (max-width:767px){
  .check-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;align-items:flex-start;margin-top:36px}
}
@media (max-width:559px){
  .container{padding:0 18px}
  .section{padding:48px 0}
  .page-hero h1{font-size:28px;line-height:1.4}
  .page-hero .lead{font-size:15.5px}
  .section-head h2{font-size:22px}
  .qa-item summary{font-size:15.5px;padding:16px}
  .qa-body{padding:14px 16px 18px}
  .cta-inner h2{font-size:22px}
  .btn{width:100%}
  .hero-actions .btn{width:100%}
  .side-cta .btn{width:100%}
}