/* roulang page: index */
:root{
  --brand-600:#1557E0;
  --brand-700:#0F3FA8;
  --brand-100:#C9DAFF;
  --brand-50:#EAF0FF;
  --accent:#FF6B35;
  --accent-50:#FFF1EA;
  --success:#12B886;
  --warning:#F59E0B;
  --error:#E5484D;
  --ink:#101828;
  --body:#475467;
  --muted:#98A2B3;
  --line:#E4E7EC;
  --soft:#F6F8FC;
  --card:#FFFFFF;
  --deep:#101B33;
  --r-card:16px;
  --r-lg:20px;
  --r-btn:10px;
  --sh1:0 1px 2px rgba(16,24,40,.06);
  --sh2:0 8px 24px -6px rgba(16,24,40,.10);
  --sh3:0 16px 40px -12px rgba(21,87,224,.22);
  --t:.18s ease-out;
  --bs-primary:#1557E0;
  --bs-body-color:#475467;
  --bs-body-font-family:'HarmonyOS Sans SC','PingFang SC','Microsoft YaHei',system-ui,sans-serif;
  --bs-border-radius:12px;
  --bs-border-color:#E4E7EC;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:'HarmonyOS Sans SC','PingFang SC','Microsoft YaHei',system-ui,sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--body);
  background:#fff;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border:0}
a{color:inherit;text-decoration:none}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p{margin:0}
button,input,select,textarea{font:inherit;color:inherit}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{
  outline:2px solid var(--brand-600);outline-offset:2px;border-radius:6px;
}
.wrap{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}
.num{font-variant-numeric:tabular-nums;font-feature-settings:"tnum";}
.section{padding:96px 0}
.section-soft{background:var(--soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-head{max-width:720px;margin-bottom:48px}
.sec-head.center{margin-left:auto;margin-right:auto;text-align:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--brand-600);background:var(--brand-50);padding:5px 14px;border-radius:999px;margin-bottom:16px}
.eyebrow::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--brand-600)}
h1{font-size:44px;line-height:56px;font-weight:700;color:var(--ink);letter-spacing:-.01em}
h2{font-size:32px;line-height:42px;font-weight:700;color:var(--ink);letter-spacing:-.01em}
h3{font-size:20px;line-height:30px;font-weight:700;color:var(--ink)}
.lead{font-size:17px;line-height:30px;color:var(--body);margin-top:16px}
.muted{color:var(--muted)}
.sec-head h2+.lead{margin-top:14px}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:1030;
  background:rgba(255,255,255,.88);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
  transition:box-shadow var(--t);
}
.site-header.scrolled{box-shadow:var(--sh1)}
.nav-inner{height:72px;display:flex;align-items:center;gap:20px}
.logo{display:flex;align-items:center;gap:10px;flex:none}
.logo-mark{
  width:38px;height:38px;border-radius:12px;flex:none;
  background:linear-gradient(135deg,var(--brand-600) 0%,#3B7BFF 100%);
  display:grid;place-items:center;color:#fff;font-size:16px;
}
.logo-text{display:flex;flex-direction:column;line-height:1.15}
.logo-text b{font-size:16px;font-weight:700;color:var(--ink);white-space:nowrap}
.logo-text span{font-size:11px;color:var(--muted);letter-spacing:.02em}
.nav-menu{display:flex;align-items:center;gap:2px;margin-left:10px}
.nav-menu a{
  position:relative;display:inline-block;padding:8px 10px;font-size:14px;font-weight:500;color:var(--body);
  border-radius:8px;transition:color var(--t),background var(--t);
}
.nav-menu a::after{
  content:"";position:absolute;left:10px;right:10px;bottom:2px;height:2px;border-radius:2px;
  background:var(--brand-600);transform:scaleX(0);transform-origin:center;transition:transform var(--t);
}
.nav-menu a:hover{color:var(--ink);background:var(--soft)}
.nav-menu a:hover::after,.nav-menu a.active::after{transform:scaleX(1)}
.nav-menu a.active{color:var(--brand-600);font-weight:600}
.nav-right{margin-left:auto;display:flex;align-items:center;gap:10px}
.cmd-search{
  display:flex;align-items:center;gap:8px;width:240px;height:40px;padding:0 12px;
  background:var(--soft);border:1px solid var(--line);border-radius:10px;color:var(--muted);
  font-size:13px;cursor:pointer;transition:var(--t);
}
.cmd-search:hover{border-color:var(--brand-100);background:#fff;box-shadow:var(--sh1);color:var(--body)}
.cmd-search i{font-size:13px;color:var(--muted)}
.kbd{margin-left:auto;font-size:11px;line-height:1;padding:4px 6px;border:1px solid var(--line);border-radius:6px;background:#fff;color:var(--muted)}
.icon-btn{
  width:40px;height:40px;border-radius:10px;border:1px solid var(--line);background:#fff;
  display:grid;place-items:center;color:var(--body);transition:var(--t);
}
.icon-btn:hover{border-color:var(--brand-100);color:var(--brand-600);background:var(--brand-50)}
.btn-main{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 24px;border-radius:var(--r-btn);border:1px solid transparent;
  background:var(--brand-600);color:#fff;font-size:15px;font-weight:600;cursor:pointer;
  transition:background var(--t),transform var(--t),box-shadow var(--t),border-color var(--t),color var(--t);
}
.btn-main:hover{background:var(--brand-700);color:#fff;transform:translateY(-1px);box-shadow:var(--sh3)}
.btn-accent{background:var(--accent)}
.btn-accent:hover{background:#E85A26}
.nav-cta{height:40px;padding:0 20px;font-size:14px}
.btn-ghost{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 24px;border-radius:var(--r-btn);
  background:#fff;border:1px solid var(--line);color:var(--ink);font-size:15px;font-weight:600;cursor:pointer;
  transition:var(--t);
}
.btn-ghost:hover{border-color:var(--brand-600);color:var(--brand-600);background:var(--brand-50)}
.btn-plain{
  display:inline-flex;align-items:center;gap:8px;height:44px;padding:0;border:0;background:none;
  color:var(--brand-600);font-size:15px;font-weight:600;cursor:pointer;
}
.btn-plain i{transition:transform var(--t)}
.btn-plain:hover i{transform:translateX(4px)}
.btn-main.on-deep{background:#fff;color:var(--deep)}
.btn-main.on-deep:hover{background:var(--brand-50);color:var(--brand-700)}
.burger{
  display:none;width:40px;height:40px;border-radius:10px;border:1px solid var(--line);
  background:#fff;place-items:center;color:var(--ink);cursor:pointer;
}
.burger:hover{border-color:var(--brand-100);color:var(--brand-600)}

/* mobile drawer */
.mask{
  position:fixed;inset:0;background:rgba(16,24,40,.42);opacity:0;visibility:hidden;
  transition:opacity var(--t),visibility var(--t);z-index:1040;
}
.mask.open{opacity:1;visibility:visible}
.drawer{
  position:fixed;top:0;right:0;bottom:0;width:min(340px,86vw);background:#fff;z-index:1050;
  transform:translateX(102%);transition:transform .18s ease-out;display:flex;flex-direction:column;
  box-shadow:var(--sh2);
}
.drawer.open{transform:translateX(0)}
.drawer-top{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--line)}
.drawer-top b{font-size:15px;color:var(--ink)}
.drawer-close{width:36px;height:36px;border-radius:10px;border:1px solid var(--line);background:#fff;color:var(--body);cursor:pointer}
.drawer-body{padding:16px 20px;flex:1;overflow-y:auto}
.drawer-search{display:flex;align-items:center;gap:8px;height:44px;padding:0 14px;background:var(--soft);border:1px solid var(--line);border-radius:10px;color:var(--muted);font-size:14px;margin-bottom:16px}
.drawer-links a{display:flex;align-items:center;justify-content:space-between;padding:14px 2px;font-size:15px;font-weight:500;color:var(--body);border-bottom:1px solid var(--line)}
.drawer-links a:hover,.drawer-links a.active{color:var(--brand-600)}
.drawer-foot{padding:16px 20px;border-top:1px solid var(--line)}
.drawer-foot .btn-main{width:100%}

/* ---------- hero ---------- */
.hero{
  position:relative;overflow:hidden;
  background:linear-gradient(180deg,#FFFFFF 0%,var(--brand-50) 100%);
  padding:76px 0 88px;
}
.hero-grid{display:grid;grid-template-columns:7fr 5fr;gap:56px;align-items:center}
.hero h1{max-width:16em}
.hero .sub{font-size:18px;line-height:30px;color:var(--body);margin-top:20px;max-width:34em}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:32px}
.hero-facts{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:36px;font-size:14px;color:var(--muted)}
.hero-facts span{display:inline-flex;align-items:center;gap:6px}
.hero-facts .sep{color:var(--line)}
.hero-facts b{color:var(--ink);font-weight:700}
.hero-visual{position:relative}
.hero-visual img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:var(--r-lg);box-shadow:var(--sh2);background:var(--soft)}
.hero-float{
  position:absolute;left:-18px;bottom:-22px;background:#fff;border:1px solid var(--line);
  border-radius:var(--r-card);box-shadow:var(--sh2);padding:14px 18px;display:flex;align-items:center;gap:14px;
  max-width:300px;
}
.date-chip{
  width:52px;height:56px;border-radius:12px;background:var(--brand-50);color:var(--brand-700);
  display:flex;flex-direction:column;align-items:center;justify-content:center;flex:none;
}
.date-chip b{font-size:19px;line-height:1;font-weight:700}
.date-chip i{font-style:normal;font-size:11px;margin-top:3px;color:var(--brand-600)}
.hero-float p{font-size:13px;line-height:20px;color:var(--body)}
.hero-float p strong{display:block;font-size:14px;color:var(--ink);margin-bottom:2px}

/* ---------- stats band ---------- */
.stats{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr)}
.stat{padding:32px 8px;text-align:center;position:relative}
.stat+.stat::before{content:"";position:absolute;left:0;top:32px;bottom:32px;width:1px;background:var(--line)}
.stat b{display:block;font-size:30px;line-height:1.2;font-weight:700;color:var(--ink);font-variant-numeric:tabular-nums}
.stat b em{font-style:normal;font-size:16px;color:var(--muted);margin-left:4px}
.stat span{display:block;font-size:14px;color:var(--muted);margin-top:6px}

/* ---------- feature split ---------- */
.split{display:grid;grid-template-columns:5fr 7fr;gap:56px;align-items:center}
.split img{width:100%;aspect-ratio:5/4;object-fit:cover;border-radius:var(--r-lg);box-shadow:var(--sh1);background:var(--soft)}
.feat-list{margin-top:8px}
.feat-item{display:flex;gap:18px;padding:22px 0;border-bottom:1px solid var(--line)}
.feat-item:last-child{border-bottom:0}
.feat-no{
  flex:none;width:40px;height:40px;border-radius:12px;background:var(--brand-50);color:var(--brand-700);
  display:grid;place-items:center;font-size:14px;font-weight:700;font-variant-numeric:tabular-nums;
}
.feat-item h3{font-size:17px;line-height:26px;margin-bottom:6px}
.feat-item p{font-size:14px;line-height:24px;color:var(--body)}

/* ---------- deep band ---------- */
.deep{background:var(--deep);color:rgba(255,255,255,.72);padding:88px 0;position:relative;overflow:hidden}
.deep::after{
  content:"";position:absolute;right:-120px;top:-120px;width:420px;height:420px;border-radius:50%;
  background:radial-gradient(circle,rgba(21,87,224,.45) 0%,rgba(16,27,51,0) 70%);
}
.deep .eyebrow{background:rgba(255,255,255,.10);color:#BBD1FF}
.deep .eyebrow::before{background:#BBD1FF}
.deep h2{color:#fff}
.deep .lead{color:rgba(255,255,255,.72)}
.deep-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:48px;position:relative;z-index:1}
.metric{
  background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12);
  border-radius:var(--r-card);padding:26px 24px;transition:var(--t);
}
.metric:hover{background:rgba(255,255,255,.09);transform:translateY(-4px)}
.metric i{font-size:18px;color:#7FA8FF}
.metric b{display:block;font-size:34px;line-height:1.2;font-weight:700;color:#fff;margin-top:16px;font-variant-numeric:tabular-nums}
.metric b em{font-style:normal;font-size:15px;color:rgba(255,255,255,.6);margin-left:4px}
.metric span{display:block;font-size:14px;color:rgba(255,255,255,.66);margin-top:8px;line-height:24px}

/* ---------- steps ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:8px}
.step{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-card);padding:26px 24px;
  box-shadow:var(--sh1);transition:var(--t);position:relative;
}
.step:hover{transform:translateY(-4px);border-color:var(--brand-100);box-shadow:var(--sh2)}
.step .no{
  display:inline-flex;align-items:center;justify-content:center;height:26px;padding:0 12px;border-radius:999px;
  background:var(--brand-50);color:var(--brand-700);font-size:13px;font-weight:700;font-variant-numeric:tabular-nums;
}
.step h3{font-size:17px;line-height:26px;margin-top:16px}
.step p{font-size:14px;line-height:24px;margin-top:8px}

/* ---------- news ---------- */
.sec-head-row{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:40px}
.news-card{
  height:100%;background:#fff;border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;
  box-shadow:var(--sh1);transition:var(--t);display:flex;flex-direction:column;
}
.news-card:hover{transform:translateY(-4px);box-shadow:var(--sh2);border-color:var(--brand-100)}
.news-thumb{display:block;position:relative;aspect-ratio:16/9;overflow:hidden;background:var(--soft)}
.news-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease-out}
.news-card:hover .news-thumb img{transform:scale(1.04)}
.news-body{padding:22px;display:flex;flex-direction:column;flex:1}
.badge-soft{
  align-self:flex-start;display:inline-block;padding:4px 12px;border-radius:999px;
  background:var(--brand-50);color:var(--brand-700);font-size:13px;line-height:20px;font-weight:600;
}
.badge-accent{background:var(--accent-50);color:#C4471B}
.news-title{font-size:17px;line-height:26px;margin-top:14px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-title a:hover{color:var(--brand-600)}
.news-desc{font-size:14px;line-height:24px;color:var(--body);margin-top:10px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-meta{
  margin-top:auto;padding-top:18px;display:flex;align-items:center;justify-content:space-between;gap:12px;
  font-size:13px;color:var(--muted);border-top:1px solid var(--line);
}
.news-meta .more{color:var(--brand-600);font-weight:600;display:inline-flex;align-items:center;gap:6px}
.news-meta .more i{transition:transform var(--t)}
.news-card:hover .news-meta .more i{transform:translateX(4px)}
.empty-state{
  text-align:center;padding:64px 24px;background:#fff;border:1px dashed var(--line);border-radius:var(--r-card);
}
.empty-illu{
  width:120px;height:120px;margin:0 auto 20px;border-radius:28px;
  background:var(--brand-50) url('/assets/images/coverpic/cover-6.png') center/70% no-repeat;
}
.empty-state p{font-size:15px;color:var(--body)}
.empty-actions{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-top:24px}

/* ---------- specs ---------- */
.spec-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:8px}
.spec{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-card);padding:22px 24px;
  display:flex;align-items:flex-start;gap:16px;box-shadow:var(--sh1);transition:var(--t);
}
.spec:hover{border-color:var(--brand-100);box-shadow:var(--sh2);transform:translateY(-3px)}
.spec i{
  width:38px;height:38px;flex:none;border-radius:11px;background:var(--brand-50);color:var(--brand-600);
  display:grid;place-items:center;font-size:15px;
}
.spec b{display:block;font-size:15px;color:var(--ink);font-weight:700}
.spec span{display:block;font-size:13.5px;line-height:22px;color:var(--muted);margin-top:4px;font-variant-numeric:tabular-nums}

/* ---------- feedback ---------- */
.fb-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:8px}
.fb{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-card);padding:26px 24px;
  box-shadow:var(--sh1);transition:var(--t);
}
.fb:hover{transform:translateY(-4px);box-shadow:var(--sh2);border-color:var(--brand-100)}
.fb .quote{font-size:15px;line-height:26px;color:var(--body)}
.fb .stars{color:var(--warning);font-size:13px;letter-spacing:2px;margin-bottom:14px}
.fb-who{display:flex;align-items:center;gap:12px;margin-top:20px;padding-top:18px;border-top:1px solid var(--line)}
.fb-who img{width:44px;height:44px;border-radius:50%;object-fit:cover;background:var(--soft)}
.fb-who b{display:block;font-size:14px;color:var(--ink)}
.fb-who span{display:block;font-size:12.5px;color:var(--muted)}

/* ---------- faq ---------- */
.faq-wrap{max-width:860px;margin:0 auto}
.accordion-item{
  border:1px solid var(--line)!important;border-radius:var(--r-card)!important;overflow:hidden;
  margin-bottom:12px;background:#fff;box-shadow:var(--sh1);
}
.accordion-item:has(.accordion-button:not(.collapsed)){border-left:3px solid var(--brand-600)!important}
.accordion-button{
  font-size:16px;font-weight:600;color:var(--ink);background:#fff;padding:20px 22px;
  box-shadow:none!important;border-radius:0!important;
}
.accordion-button:not(.collapsed){background:var(--brand-50);color:var(--brand-700)}
.accordion-button::after{display:none}
.accordion-button::before{
  content:"+";order:2;margin-left:auto;font-size:20px;font-weight:500;color:var(--brand-600);
  line-height:1;width:22px;text-align:center;
}
.accordion-button:not(.collapsed)::before{content:"−"}
.accordion-button:focus{outline:0}
.accordion-body{padding:4px 22px 22px;font-size:15px;line-height:28px;color:var(--body)}

/* ---------- form ---------- */
.apply{background:var(--brand-50);padding:88px 0}
.apply-card{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:36px;box-shadow:var(--sh1)}
.apply-grid{display:grid;grid-template-columns:6fr 6fr;gap:48px}
.field{margin-bottom:18px}
.field label{display:block;font-size:14px;font-weight:600;color:var(--ink);margin-bottom:8px}
.field .ctrl{
  width:100%;height:44px;padding:0 14px;border:1px solid var(--line);border-radius:var(--r-btn);
  background:#fff;font-size:14.5px;color:var(--ink);transition:var(--t);
}
.field textarea.ctrl{height:110px;padding:12px 14px;line-height:24px;resize:vertical}
.field .ctrl::placeholder{color:var(--muted)}
.field .ctrl:focus{border-color:var(--brand-600);box-shadow:0 0 0 4px rgba(21,87,224,.12);outline:0}
.field .hint{font-size:12px;color:var(--muted);margin-top:6px}
.check{display:flex;align-items:flex-start;gap:10px;font-size:13.5px;line-height:22px;color:var(--body);margin:6px 0 22px}
.check input{width:18px;height:18px;margin-top:2px;accent-color:var(--brand-600);flex:none}
.promise{display:flex;gap:16px;padding:20px 0;border-bottom:1px solid var(--line)}
.promise:last-of-type{border-bottom:0}
.promise i{
  width:42px;height:42px;flex:none;border-radius:12px;background:var(--brand-50);color:var(--brand-600);
  display:grid;place-items:center;font-size:16px;
}
.promise b{display:block;font-size:15.5px;color:var(--ink)}
.promise p{font-size:14px;line-height:24px;color:var(--body);margin-top:4px}
.note-card{
  margin-top:22px;background:var(--soft);border:1px solid var(--line);border-radius:var(--r-card);padding:20px 22px;
}
.note-card b{display:block;font-size:14px;color:var(--ink);margin-bottom:8px}
.note-card p{font-size:13.5px;line-height:24px;color:var(--body)}

/* ---------- bottom cta ---------- */
.bottom-cta{background:var(--deep);padding:64px 0;color:rgba(255,255,255,.72)}
.bottom-cta .inner{display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap}
.bottom-cta h2{color:#fff;font-size:28px;line-height:38px}
.bottom-cta p{font-size:14.5px;margin-top:8px;color:rgba(255,255,255,.66)}
.bottom-cta .actions{display:flex;gap:14px;flex-wrap:wrap}
.btn-outline-light2{
  display:inline-flex;align-items:center;justify-content:center;height:44px;padding:0 24px;border-radius:var(--r-btn);
  border:1px solid rgba(255,255,255,.30);color:#fff;font-size:15px;font-weight:600;background:transparent;transition:var(--t);
}
.btn-outline-light2:hover{background:rgba(255,255,255,.12);border-color:rgba(255,255,255,.55);color:#fff}

/* ---------- footer ---------- */
.site-footer{background:var(--soft);border-top:1px solid var(--line);padding:64px 0 0}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.3fr 1.3fr;gap:32px}
.foot-brand p{font-size:14px;line-height:24px;color:var(--body);margin-top:16px;max-width:30em}
.foot-col h3{font-size:14px;font-weight:700;color:var(--ink);margin-bottom:16px}
.foot-col a,.foot-col li{display:block;font-size:14px;line-height:26px;color:var(--body);transition:color var(--t)}
.foot-col a:hover{color:var(--brand-600)}
.foot-bottom{
  margin-top:48px;border-top:1px solid var(--line);padding:22px 0 28px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:var(--muted);
}
.foot-bottom .links{display:flex;gap:20px}
.foot-bottom .links a:hover{color:var(--brand-600)}
.tag-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}
.tag{display:inline-block;padding:5px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:12.5px;color:var(--body);transition:var(--t)}
.tag:hover{border-color:var(--brand-100);color:var(--brand-600);background:var(--brand-50)}

/* ---------- to top ---------- */
.to-top{
  position:fixed;right:24px;bottom:24px;width:48px;height:48px;border-radius:50%;border:1px solid var(--line);
  background:#fff;color:var(--ink);box-shadow:var(--sh2);cursor:pointer;display:grid;place-items:center;
  opacity:0;visibility:hidden;transition:var(--t);z-index:1020;
}
.to-top.show{opacity:1;visibility:visible}
.to-top:hover{color:var(--brand-600);border-color:var(--brand-100);transform:translateY(-2px)}

/* reveal */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .24s ease-out,transform .24s ease-out}
.reveal.in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1199.98px){
  h1{font-size:38px;line-height:50px}
  h2{font-size:28px;line-height:38px}
  .section{padding:72px 0}
  .hero{padding:60px 0 72px}
  .hero-grid{grid-template-columns:6fr 6fr;gap:40px}
  .split{grid-template-columns:6fr 6fr;gap:40px}
  .foot-grid{grid-template-columns:2fr 1fr 1fr 1.4fr;row-gap:36px}
  .cmd-search{width:200px}
}
@media (max-width:991.98px){
  .nav-menu{display:none}
  .cmd-search{display:none}
  .icon-btn{display:none}
  .nav-cta{display:none}
  .burger{display:grid}
  .nav-inner{height:60px}
  .section{padding:72px 0}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .stat:nth-child(3)::before{display:none}
  .stat{padding:26px 8px}
  .deep-grid{grid-template-columns:1fr 1fr}
  .steps{grid-template-columns:1fr 1fr}
  .spec-grid{grid-template-columns:1fr 1fr}
  .fb-grid{grid-template-columns:1fr}
  .apply-grid{grid-template-columns:1fr;gap:32px}
  .hero-float{left:0;bottom:-18px}
  .foot-grid{grid-template-columns:1fr 1fr;row-gap:32px}
  .bottom-cta .inner{flex-direction:column;align-items:flex-start}
}
@media (max-width:767.98px){
  .wrap{padding:0 16px}
  h1{font-size:30px;line-height:40px}
  h2{font-size:24px;line-height:34px}
  h3{font-size:18px;line-height:28px}
  .section{padding:56px 0}
  .hero{padding:44px 0 60px}
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .hero .sub{font-size:16px;line-height:28px}
  .hero-actions .btn-main,.hero-actions .btn-ghost{width:100%}
  .hero-visual img{aspect-ratio:16/11}
  .hero-float{position:static;margin-top:18px;max-width:none}
  .split{grid-template-columns:1fr;gap:32px}
  .split img{aspect-ratio:16/10}
  .deep{padding:64px 0}
  .deep-grid{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  .spec-grid{grid-template-columns:1fr}
  .sec-head-row{flex-direction:column;align-items:flex-start;gap:12px;margin-bottom:28px}
  .sec-head{margin-bottom:32px}
  .apply{padding:64px 0}
  .apply-card{padding:24px 20px}
  .bottom-cta{padding:52px 0}
  .bottom-cta h2{font-size:22px;line-height:32px}
  .bottom-cta .actions{width:100%}
  .bottom-cta .actions .btn-main,.bottom-cta .actions .btn-outline-light2{width:100%}
  .foot-grid{grid-template-columns:1fr}
  .foot-bottom{flex-direction:column;align-items:flex-start}
  .to-top{right:16px;bottom:16px}
}
@media (max-width:519.98px){
  h1{font-size:26px;line-height:36px}
  .stats-grid{grid-template-columns:1fr}
  .stat+.stat::before{display:none}
  .stat{border-top:1px solid var(--line);padding:22px 8px}
  .stat:first-child{border-top:0}
}

/* roulang page: article */
:root{
  --brand-600:#1557E0;
  --brand-700:#0F3FA8;
  --brand-50:#EAF0FF;
  --accent:#FF6B35;
  --accent-50:#FFF1EA;
  --success:#12B886;
  --warning:#F59E0B;
  --error:#E5484D;
  --ink:#101828;
  --body:#475467;
  --muted:#98A2B3;
  --line:#E4E7EC;
  --soft:#F6F8FC;
  --deep:#101B33;
  --r-card:16px;
  --r-img:20px;
  --r-btn:10px;
  --r-pill:999px;
  --sh1:0 1px 2px rgba(16,24,40,.06);
  --sh2:0 8px 24px -6px rgba(16,24,40,.10);
  --sh3:0 16px 40px -12px rgba(21,87,224,.22);
  --t:.18s ease-out;
  --bs-primary:#1557E0;
  --bs-body-color:#475467;
  --bs-border-radius:16px;
  --bs-font-sans-serif:'HarmonyOS Sans SC','PingFang SC','Microsoft YaHei',system-ui,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:'HarmonyOS Sans SC','PingFang SC','Microsoft YaHei',system-ui,sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--body);
  background:#fff;
}
img{max-width:100%;display:block;border:0}
a{color:var(--brand-600);text-decoration:none;transition:color var(--t)}
a:hover{color:var(--brand-700)}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4{margin:0;color:var(--ink);font-weight:700;line-height:1.32}
p{margin:0}
button{font:inherit}
:focus-visible{outline:2px solid var(--brand-600);outline-offset:2px;border-radius:6px}
.num{font-variant-numeric:tabular-nums}

.wrap{max-width:1200px;margin:0 auto;padding:0 24px}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:1000;
  background:rgba(255,255,255,.9);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
  transition:box-shadow var(--t);
}
.site-header.scrolled{box-shadow:var(--sh1)}
.nav-inner{display:flex;align-items:center;gap:24px;height:72px}
.logo{display:flex;align-items:center;gap:12px;color:inherit;flex-shrink:0}
.logo:hover{color:inherit}
.logo-mark{
  width:40px;height:40px;border-radius:12px;background:var(--brand-600);color:#fff;
  display:grid;place-items:center;font-size:17px;flex-shrink:0;
}
.logo-text{display:flex;flex-direction:column;line-height:1.2}
.logo-text b{font-size:16px;font-weight:700;color:var(--ink);letter-spacing:-.01em}
.logo-text span{font-size:12px;color:var(--muted);margin-top:2px}
.nav-menu{display:flex;align-items:center;gap:26px;margin-left:6px}
.nav-menu a{
  position:relative;font-size:14px;font-weight:500;color:var(--body);padding:8px 0;white-space:nowrap;
}
.nav-menu a::after{
  content:"";position:absolute;left:0;right:0;bottom:2px;height:2px;border-radius:2px;
  background:var(--brand-600);transform:scaleX(0);transform-origin:left;transition:transform var(--t);
}
.nav-menu a:hover,.nav-menu a.active{color:var(--ink)}
.nav-menu a.active{color:var(--brand-600)}
.nav-menu a:hover::after,.nav-menu a.active::after{transform:scaleX(1)}
.nav-right{margin-left:auto;display:flex;align-items:center;gap:12px}
.cmd-search{
  display:flex;align-items:center;gap:10px;width:240px;height:40px;padding:0 12px;
  border-radius:10px;background:var(--soft);border:1px solid transparent;
  color:var(--muted);font-size:13px;cursor:text;transition:all var(--t);
}
.cmd-search:hover{border-color:var(--line);background:#fff}
.cmd-search .kbd{
  margin-left:auto;font-size:11px;background:#fff;border:1px solid var(--line);
  border-radius:6px;padding:1px 6px;color:var(--muted);white-space:nowrap;
}
.icon-btn{
  width:40px;height:40px;border-radius:10px;display:grid;place-items:center;
  color:var(--body);border:1px solid var(--line);background:#fff;transition:all var(--t);
}
.icon-btn:hover{color:var(--brand-600);border-color:#c9daff;background:var(--brand-50)}
.btn-main{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 24px;border-radius:var(--r-btn);border:1px solid transparent;
  font-size:14px;font-weight:600;cursor:pointer;white-space:nowrap;
  transition:all var(--t);
}
.btn-accent{background:var(--accent);color:#fff}
.btn-accent:hover{background:#E85C28;color:#fff;transform:translateY(-1px);box-shadow:var(--sh3)}
.btn-brand{background:var(--brand-600);color:#fff}
.btn-brand:hover{background:var(--brand-700);color:#fff;transform:translateY(-1px);box-shadow:var(--sh3)}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--ink)}
.btn-ghost:hover{border-color:var(--brand-600);color:var(--brand-600);background:var(--brand-50)}
.nav-cta{height:40px;padding:0 18px}
.burger{
  display:none;width:40px;height:40px;border-radius:10px;border:1px solid var(--line);
  background:#fff;color:var(--ink);place-items:center;cursor:pointer;
}
.m-search{display:none}

/* ---------- article ---------- */
.article-top{padding:32px 0 0}
.crumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--muted);margin-bottom:24px}
.crumb a{color:var(--muted)}
.crumb a:hover{color:var(--brand-600)}
.crumb .sep{color:#CBD2DC}
.crumb .cur{color:var(--body)}
.article-head{max-width:840px}
.chip{
  display:inline-flex;align-items:center;height:28px;padding:0 14px;border-radius:var(--r-pill);
  background:var(--brand-50);color:var(--brand-600);font-size:13px;font-weight:600;
}
.article-head h1{font-size:40px;line-height:1.28;margin:16px 0 18px;letter-spacing:-.01em}
.meta-row{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:14px;color:var(--muted)}
.meta-row .dot{width:4px;height:4px;border-radius:50%;background:#D0D5DD}
.article-cover{
  margin:32px 0 48px;border-radius:var(--r-img);overflow:hidden;
  background:var(--soft);aspect-ratio:16/9;
}
.article-cover img{width:100%;height:100%;object-fit:cover}
.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:56px;align-items:start}
.article-body{max-width:760px;font-size:17px;line-height:1.9;color:var(--body)}
.article-body h2{position:relative;font-size:26px;line-height:1.45;margin:48px 0 16px;padding-left:18px}
.article-body h2::before{
  content:"";position:absolute;left:0;top:.3em;bottom:.3em;width:4px;border-radius:4px;background:var(--brand-600);
}
.article-body h3{font-size:20px;margin:32px 0 12px}
.article-body h4{font-size:17px;margin:24px 0 10px}
.article-body p{margin:0 0 20px}
.article-body ul,.article-body ol{margin:0 0 20px;padding-left:24px}
.article-body ul{list-style:disc}
.article-body ol{list-style:decimal}
.article-body li{margin-bottom:8px}
.article-body blockquote{
  margin:24px 0;padding:16px 20px;background:var(--brand-50);
  border-left:3px solid var(--brand-600);border-radius:0 12px 12px 0;color:#344054;
}
.article-body blockquote p:last-child{margin-bottom:0}
.article-body img{border-radius:12px;margin:24px auto}
.article-body figure{margin:24px 0}
.article-body figcaption{text-align:center;font-size:14px;color:var(--muted);margin-top:10px}
.article-body table{width:100%;display:block;overflow-x:auto;border-collapse:collapse;margin:24px 0;font-size:15px}
.article-body th,.article-body td{border:1px solid var(--line);padding:10px 14px;text-align:left;white-space:nowrap}
.article-body th{background:var(--soft);color:var(--ink);font-weight:600}
.article-body a{color:var(--brand-600);text-decoration:underline;text-underline-offset:3px}
.article-body a:hover{color:var(--brand-700)}
.article-body code{background:var(--soft);border:1px solid var(--line);border-radius:6px;padding:1px 6px;font-size:15px}

.article-side{position:sticky;top:96px;display:flex;flex-direction:column;gap:20px}
.side-card{background:#fff;border:1px solid var(--line);border-radius:var(--r-card);box-shadow:var(--sh1);padding:20px}
.side-card h3{font-size:14px;font-weight:700;color:var(--ink);margin-bottom:14px}
.side-links li{margin-bottom:10px}
.side-links li:last-child{margin-bottom:0}
.side-links a{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--body)}
.side-links a i{font-size:11px;color:var(--brand-600)}
.side-links a:hover{color:var(--brand-600)}
.side-note{background:var(--soft);border-color:transparent}
.side-note p{font-size:13px;color:var(--body);line-height:1.7}

.empty-state{
  text-align:center;padding:56px 24px;border:1px dashed var(--line);
  border-radius:var(--r-card);background:var(--soft);
}
.empty-state .ico{
  width:72px;height:72px;border-radius:50%;background:#fff;color:var(--muted);
  display:grid;place-items:center;font-size:28px;margin:0 auto 16px;border:1px solid var(--line);
}
.empty-state h2{font-size:20px;margin-bottom:10px}
.empty-state p{font-size:14px;color:var(--body);margin-bottom:20px}

.block-title{margin-bottom:24px}
.block-title h2{font-size:26px}
.block-title p{font-size:14px;color:var(--muted);margin-top:8px}

.article-foot{margin-top:56px;padding-top:32px;border-top:1px solid var(--line)}
.tag-row{display:flex;flex-wrap:wrap;gap:10px}
.tag{
  display:inline-flex;align-items:center;height:30px;padding:0 14px;border-radius:var(--r-pill);
  background:var(--soft);border:1px solid var(--line);font-size:13px;color:var(--body);transition:all var(--t);
}
.tag:hover{border-color:var(--brand-600);color:var(--brand-600);background:var(--brand-50)}

.pn-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:32px}
.pn-card{
  display:block;padding:20px;border:1px solid var(--line);border-radius:var(--r-card);
  background:#fff;box-shadow:var(--sh1);transition:all var(--t);
}
.pn-card:hover{transform:translateY(-2px);box-shadow:var(--sh2);border-color:#c9daff}
.pn-dir{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);margin-bottom:8px}
.pn-card.next .pn-dir{justify-content:flex-end}
.pn-title{display:block;font-size:15px;font-weight:600;color:var(--ink);line-height:1.5}
.pn-card.next .pn-title{text-align:right}
.pn-card:hover .pn-title{color:var(--brand-600)}

.rel-section{margin-top:56px}
.rel-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;
  box-shadow:var(--sh1);transition:transform var(--t),box-shadow var(--t),border-color var(--t);
  display:flex;flex-direction:column;
}
.card:hover{transform:translateY(-4px);border-color:#c9daff;box-shadow:var(--sh2)}
.card-thumb{aspect-ratio:16/9;background:var(--soft);overflow:hidden}
.card-thumb img{width:100%;height:100%;object-fit:cover}
.card-body{padding:20px;display:flex;flex-direction:column;flex:1}
.card-body h3{font-size:17px;line-height:1.5;margin:10px 0 10px}
.card:hover .card-body h3{color:var(--brand-600)}
.card-desc{font-size:14px;color:var(--body);line-height:1.7;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-meta{margin-top:auto;padding-top:16px;display:flex;align-items:center;justify-content:space-between;font-size:13px;color:var(--muted)}
.card-meta .more{color:var(--brand-600);font-weight:600;display:inline-flex;align-items:center;gap:6px}
.card-meta .more i{transition:transform var(--t)}

.back-cat{margin-top:40px}
.back-cat a{
  display:inline-flex;align-items:center;gap:8px;height:44px;padding:0 22px;
  border:1px solid var(--line);border-radius:var(--r-btn);font-size:14px;font-weight:600;color:var(--ink);
  transition:all var(--t);
}
.back-cat a:hover{border-color:var(--brand-600);color:var(--brand-600);background:var(--brand-50)}
.back-cat a i{transition:transform var(--t)}
.back-cat a:hover i{transform:translateX(3px)}

/* ---------- cta band ---------- */
.cta-band{background:var(--deep);color:#fff;padding:64px 0;margin-top:96px}
.cta-band .wrap{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:24px}
.cta-band h2{color:#fff;font-size:26px}
.cta-band p{color:rgba(255,255,255,.72);font-size:14px;margin-top:10px}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px}
.cta-band .btn-ghost{border-color:rgba(255,255,255,.28);color:#fff}
.cta-band .btn-ghost:hover{background:rgba(255,255,255,.1);border-color:#fff;color:#fff}

/* ---------- footer ---------- */
.site-footer{background:var(--soft);border-top:1px solid var(--line);padding:64px 0 0}
.foot-grid{display:grid;grid-template-columns:1.7fr 1fr 1fr 1fr 1fr;gap:32px;padding-bottom:40px}
.foot-brand p{font-size:14px;line-height:1.8;color:var(--body);margin:18px 0 16px;max-width:340px}
.foot-brand .tag-row{gap:8px}
.foot-col h3{font-size:14px;font-weight:700;color:var(--ink);margin-bottom:16px}
.foot-col a,.foot-col li{display:block;font-size:14px;color:var(--body);margin-bottom:10px;line-height:1.6}
.foot-col a:hover{color:var(--brand-600)}
.foot-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;
  border-top:1px solid var(--line);padding:22px 0;font-size:13px;color:var(--muted);
}
.foot-bottom .links{display:flex;flex-wrap:wrap;gap:20px}
.foot-bottom .links a{color:var(--muted)}
.foot-bottom .links a:hover{color:var(--brand-600)}

/* ---------- back to top ---------- */
.back-top{
  position:fixed;right:24px;bottom:24px;width:48px;height:48px;border-radius:50%;
  background:#fff;border:1px solid var(--line);box-shadow:var(--sh2);color:var(--brand-600);
  display:grid;place-items:center;cursor:pointer;opacity:0;visibility:hidden;transition:all var(--t);z-index:900;
}
.back-top.show{opacity:1;visibility:visible}
.back-top:hover{transform:translateY(-2px);box-shadow:var(--sh3)}

@keyframes fadeIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}

/* ---------- responsive ---------- */
@media (max-width:1199px){
  .article-layout{grid-template-columns:minmax(0,1fr);gap:40px}
  .article-side{position:static;flex-direction:row;flex-wrap:wrap}
  .article-side .side-card{flex:1 1 260px}
}
@media (max-width:991px){
  .wrap{padding:0 20px}
  .nav-inner{height:60px;gap:12px}
  .nav-menu{
    position:fixed;top:60px;left:0;right:0;max-height:calc(100vh - 60px);overflow:auto;
    flex-direction:column;align-items:stretch;gap:0;margin-left:0;
    padding:12px 20px 24px;background:#fff;border-bottom:1px solid var(--line);
    box-shadow:var(--sh2);display:none;
  }
  .nav-menu.open{display:flex;animation:fadeIn .18s ease-out}
  .nav-menu a{padding:14px 0;border-bottom:1px solid var(--soft);font-size:15px}
  .nav-menu a::after{display:none}
  .m-search{
    display:flex;align-items:center;gap:10px;height:42px;padding:0 12px;margin:4px 0 12px;
    border-radius:10px;background:var(--soft);color:var(--muted);font-size:14px;
  }
  .cmd-search,.icon-btn{display:none}
  .burger{display:grid}
  .nav-cta{height:38px;padding:0 14px;font-size:13px}
  .logo-text span{display:none}
  .article-head h1{font-size:32px}
  .article-cover{margin:24px 0 36px}
  .rel-grid{grid-template-columns:repeat(2,1fr)}
  .foot-grid{grid-template-columns:repeat(2,1fr);gap:28px}
  .foot-brand{grid-column:1 / -1}
  .cta-band{padding:52px 0;margin-top:72px}
  .cta-band h2{font-size:22px}
  .article-side{flex-direction:column}
  .article-side .side-card{flex:none}
}
@media (max-width:767px){
  .article-body{font-size:17px;line-height:1.85}
  .pn-grid{grid-template-columns:1fr}
  .pn-card.next .pn-dir,.pn-card.next .pn-title{justify-content:flex-start;text-align:left}
  .rel-grid{grid-template-columns:1fr}
  .article-head h1{font-size:27px;line-height:1.35}
  .article-body h2{font-size:22px;margin-top:40px}
  .cta-band .wrap{flex-direction:column;align-items:flex-start}
  .cta-actions{width:100%}
  .cta-actions .btn-main{flex:1 1 auto}
}
@media (max-width:520px){
  .wrap{padding:0 16px}
  .nav-cta{display:none}
  .article-head h1{font-size:24px}
  .foot-grid{grid-template-columns:1fr}
  .btn-main{width:100%}
  .cta-actions{flex-direction:column}
  .back-top{right:16px;bottom:16px;width:44px;height:44px}
}

/* roulang page: category1 */
:root{
  --brand-600:#1557E0;
  --brand-700:#0F3FA8;
  --brand-50:#EAF0FF;
  --accent:#FF6B35;
  --accent-soft:#FFF1EB;
  --success:#12B886;
  --warning:#F59E0B;
  --error:#E5484D;
  --ink:#101828;
  --text:#475467;
  --muted:#98A2B3;
  --line:#E4E7EC;
  --soft:#F6F8FC;
  --card:#FFFFFF;
  --deep:#101B33;
  --r-card:16px;
  --r-lg:20px;
  --r-btn:10px;
  --sh1:0 1px 2px rgba(16,24,40,.06);
  --sh2:0 8px 24px -6px rgba(16,24,40,.10);
  --sh3:0 16px 40px -12px rgba(21,87,224,.22);
  --bs-primary:#1557E0;
  --bs-body-color:#475467;
  --bs-border-radius:16px;
  --bs-font-sans-serif:'HarmonyOS Sans SC','PingFang SC','Microsoft YaHei',system-ui,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:'HarmonyOS Sans SC','PingFang SC','Microsoft YaHei',system-ui,sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--text);
  background:#fff;
  -webkit-font-smoothing:antialiased;
  font-variant-numeric:tabular-nums;
}
img{max-width:100%;display:block;background:#EEF1F6}
a{color:var(--brand-600);text-decoration:none;transition:color .18s ease-out}
a:hover{color:var(--brand-700)}
h1,h2,h3,h4{color:var(--ink);font-weight:700;margin:0;line-height:1.3}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
button{font-family:inherit}
:focus-visible{outline:2px solid var(--brand-600);outline-offset:2px}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}
.skip{position:absolute;left:-9999px}
.skip:focus{left:16px;top:16px;z-index:2000;background:#fff;padding:10px 16px;border-radius:10px;box-shadow:var(--sh2)}

/* ============ 导航 ============ */
.site-header{
  position:sticky;top:0;z-index:1000;
  background:rgba(255,255,255,.88);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
  transition:box-shadow .18s ease-out;
}
.site-header.is-stuck{box-shadow:var(--sh1)}
.nav-inner{display:flex;align-items:center;gap:20px;height:72px}
.logo{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.logo-mark{
  width:38px;height:38px;border-radius:12px;
  background:linear-gradient(135deg,var(--brand-600),var(--brand-700));
  color:#fff;display:grid;place-items:center;font-size:16px;flex:0 0 auto;
}
.logo-text b{display:block;font-size:16px;font-weight:700;color:var(--ink);line-height:1.25}
.logo-text span{display:block;font-size:12px;color:var(--muted);line-height:1.35}
.nav-menu{display:flex;align-items:center;gap:22px;flex:1 1 auto;min-width:0}
.nav-menu a{
  position:relative;font-size:14px;font-weight:500;color:var(--text);
  padding:6px 0;white-space:nowrap;
}
.nav-menu a::after{
  content:"";position:absolute;left:0;right:0;bottom:2px;height:2px;
  background:var(--brand-600);border-radius:2px;transform:scaleX(0);
  transition:transform .18s ease-out;
}
.nav-menu a:hover{color:var(--ink)}
.nav-menu a:hover::after{transform:scaleX(1)}
.nav-menu a.active{color:var(--brand-600)}
.nav-menu a.active::after{transform:scaleX(1)}
.nav-right{display:flex;align-items:center;gap:12px;flex:0 0 auto}
.cmd-search{
  display:flex;align-items:center;gap:8px;
  width:240px;height:40px;padding:0 12px;
  background:var(--soft);border:1px solid var(--line);border-radius:var(--r-btn);
  color:var(--muted);font-size:13px;cursor:text;transition:border-color .18s,box-shadow .18s;
}
.cmd-search:hover{border-color:#CFD6E4}
.cmd-search .kbd{
  margin-left:auto;font-size:11px;border:1px solid var(--line);
  background:#fff;border-radius:6px;padding:2px 6px;color:var(--muted);
}
.icon-btn{
  width:40px;height:40px;border-radius:var(--r-btn);
  display:grid;place-items:center;color:var(--text);
  border:1px solid var(--line);background:#fff;transition:all .18s ease-out;
}
.icon-btn:hover{color:var(--brand-600);border-color:var(--brand-600);background:var(--brand-50)}
.btn-main{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 22px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;border:1px solid transparent;cursor:pointer;
  transition:all .18s ease-out;
}
.btn-accent{background:var(--accent);color:#fff}
.btn-accent:hover{background:#e85b28;color:#fff;transform:translateY(-1px);box-shadow:var(--sh3)}
.btn-brand{background:var(--brand-600);color:#fff}
.btn-brand:hover{background:var(--brand-700);color:#fff;transform:translateY(-1px);box-shadow:var(--sh3)}
.btn-outline{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-outline:hover{border-color:var(--brand-600);color:var(--brand-600);background:var(--brand-50)}
.btn-ghost{background:transparent;color:var(--brand-700)}
.btn-ghost:hover{background:var(--brand-50);color:var(--brand-700)}
.btn-link-arrow{
  display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--brand-600);
}
.btn-link-arrow i{transition:transform .18s ease-out}
.btn-link-arrow:hover i{transform:translateX(3px)}
.btn-block{width:100%}
.nav-cta{height:40px;padding:0 18px;font-size:14px}
.burger{
  display:none;width:40px;height:40px;border-radius:var(--r-btn);
  border:1px solid var(--line);background:#fff;color:var(--ink);
}
.nav-backdrop{
  position:fixed;inset:0;background:rgba(16,27,51,.38);opacity:0;visibility:hidden;
  transition:opacity .18s ease-out;z-index:999;
}
body.nav-open .nav-backdrop{opacity:1;visibility:visible}

/* ============ 通用板块 ============ */
.sec{padding:96px 0}
.sec-soft{background:var(--soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-head{max-width:720px;margin-bottom:40px}
.sec-head .eyebrow{
  display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:600;
  color:var(--brand-700);background:var(--brand-50);border-radius:999px;padding:5px 12px;margin-bottom:14px;
}
.sec-head h2{font-size:32px;line-height:1.35;margin-bottom:12px}
.sec-head p{font-size:16px;color:var(--text);max-width:640px}
.sec-head.row-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;max-width:none}

/* ============ 分类 Hero ============ */
.cat-hero{
  background:linear-gradient(180deg,#FFFFFF 0%,var(--brand-50) 100%);
  border-bottom:1px solid var(--line);
  padding:44px 0 64px;
}
.cat-hero-inner{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.crumbs{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);margin-bottom:18px;flex-wrap:wrap}
.crumbs a{color:var(--muted)}
.crumbs a:hover{color:var(--brand-600)}
.crumbs .sep{color:#CBD3E1}
.crumbs .now{color:var(--text)}
.cat-hero h1{font-size:44px;line-height:1.25;letter-spacing:-.5px;margin-bottom:14px}
.cat-hero .lead{font-size:17px;color:var(--text);margin-bottom:22px}
.hero-facts{
  display:flex;flex-wrap:wrap;gap:10px 18px;margin-bottom:26px;
  font-size:14px;color:var(--text);
}
.hero-facts li{position:relative;padding-left:16px}
.hero-facts li::before{
  content:"";position:absolute;left:0;top:9px;width:6px;height:6px;border-radius:50%;
  background:var(--brand-600);
}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px}
.cat-hero-media{position:relative}
.cat-hero-media img{
  width:100%;aspect-ratio:16/11;object-fit:cover;border-radius:var(--r-lg);
  box-shadow:var(--sh2);
}
.hero-float{
  position:absolute;left:20px;bottom:-22px;
  background:#fff;border:1px solid var(--line);border-radius:var(--r-card);
  box-shadow:var(--sh2);padding:14px 18px;display:flex;align-items:center;gap:14px;max-width:330px;
}
.date-block{
  width:52px;height:52px;border-radius:12px;background:var(--brand-50);
  color:var(--brand-700);display:grid;place-items:center;line-height:1.1;text-align:center;flex:0 0 auto;
}
.date-block b{font-size:17px;font-weight:700;display:block}
.date-block span{font-size:11px;color:var(--brand-600)}
.hero-float p{font-size:13px;color:var(--text);line-height:1.5}
.hero-float p b{color:var(--ink)}

/* ============ 参数卡 ============ */
.spec-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.spec-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-card);
  padding:24px;box-shadow:var(--sh1);transition:all .18s ease-out;
}
.spec-card:hover{transform:translateY(-4px);border-color:#C9D8FB;box-shadow:var(--sh2)}
.spec-card .ico{
  width:42px;height:42px;border-radius:12px;background:var(--brand-50);color:var(--brand-600);
  display:grid;place-items:center;font-size:17px;margin-bottom:16px;
}
.spec-card h3{font-size:16px;margin-bottom:6px}
.spec-card .val{font-size:24px;font-weight:700;color:var(--ink);letter-spacing:-.3px;margin-bottom:8px}
.spec-card p{font-size:14px;color:var(--text);line-height:1.7}

/* ============ 步骤流程 ============ */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.step{
  position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--r-card);
  padding:26px 22px;box-shadow:var(--sh1);transition:all .18s ease-out;
}
.step:hover{transform:translateY(-4px);box-shadow:var(--sh2);border-color:#C9D8FB}
.step .num{
  font-size:26px;font-weight:700;color:var(--brand-600);letter-spacing:-.5px;
  display:flex;align-items:center;gap:10px;margin-bottom:14px;
}
.step .num::after{content:"";flex:1 1 auto;height:1px;background:var(--line)}
.step h3{font-size:17px;margin-bottom:8px}
.step p{font-size:14px;line-height:1.75}
.step .chip{
  display:inline-block;margin-top:14px;font-size:12px;color:var(--brand-700);
  background:var(--brand-50);border-radius:999px;padding:3px 10px;
}

/* ============ 安装包对比 ============ */
.plan-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;align-items:stretch}
.plan{
  position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--r-card);
  padding:28px 24px;box-shadow:var(--sh1);display:flex;flex-direction:column;transition:all .18s ease-out;
}
.plan:hover{transform:translateY(-4px);box-shadow:var(--sh2);border-color:#C9D8FB}
.plan.is-hot{border:2px solid var(--brand-600);box-shadow:var(--sh3)}
.plan .flag{
  position:absolute;top:-13px;left:24px;background:var(--accent-soft);color:#C7431A;
  font-size:12px;font-weight:700;border-radius:999px;padding:4px 12px;
}
.plan h3{font-size:18px;margin-bottom:6px}
.plan .price{font-size:30px;font-weight:700;color:var(--ink);letter-spacing:-.5px;margin:6px 0 4px}
.plan .price small{font-size:13px;font-weight:500;color:var(--muted);margin-left:6px;letter-spacing:0}
.plan .sub{font-size:13px;color:var(--muted);margin-bottom:18px}
.benefits{border-top:1px solid var(--line);padding-top:18px;display:grid;gap:12px;margin-bottom:22px}
.benefits li{display:flex;gap:10px;font-size:14px;color:var(--text);line-height:1.6}
.benefits li i{color:var(--brand-600);font-size:13px;margin-top:5px;flex:0 0 auto}
.plan .foot{margin-top:auto}

/* ============ 排查区 ============ */
.trouble{display:grid;grid-template-columns:1.35fr .65fr;gap:32px;align-items:start}
.trouble-list{display:grid;gap:16px}
.trouble-item{
  display:flex;gap:18px;background:#fff;border:1px solid var(--line);border-radius:var(--r-card);
  padding:22px 24px;box-shadow:var(--sh1);transition:all .18s ease-out;
}
.trouble-item:hover{transform:translateY(-4px);box-shadow:var(--sh2);border-color:#C9D8FB}
.trouble-item .idx{
  width:36px;height:36px;border-radius:10px;background:var(--brand-50);color:var(--brand-700);
  font-weight:700;font-size:15px;display:grid;place-items:center;flex:0 0 auto;
}
.trouble-item h3{font-size:16px;margin-bottom:6px}
.trouble-item p{font-size:14px;line-height:1.75}
.side-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-card);
  padding:26px 24px;box-shadow:var(--sh1);
}
.side-card h3{font-size:17px;margin-bottom:10px}
.side-card p{font-size:14px;line-height:1.75;margin-bottom:18px}
.side-card .stamp{
  display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:600;
  color:var(--success);background:#E8F8F2;border-radius:999px;padding:4px 10px;margin-bottom:14px;
}

/* ============ 图文区块 ============ */
.split{display:grid;grid-template-columns:.95fr 1.05fr;gap:48px;align-items:center}
.split img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:var(--r-lg);box-shadow:var(--sh2)}
.split h2{font-size:32px;line-height:1.35;margin-bottom:14px}
.split .intro{font-size:16px;margin-bottom:22px}
.check-list{display:grid;gap:16px;margin-bottom:26px}
.check-list li{display:flex;gap:14px}
.check-list li i{
  width:30px;height:30px;border-radius:9px;background:var(--brand-50);color:var(--brand-600);
  display:grid;place-items:center;font-size:13px;flex:0 0 auto;margin-top:2px;
}
.check-list li b{display:block;color:var(--ink);font-size:15px;margin-bottom:2px}
.check-list li p{font-size:14px;line-height:1.7}

/* ============ FAQ ============ */
.faq-wrap{max-width:880px;margin:0 auto}
.faq .accordion-item{
  border:1px solid var(--line);border-radius:var(--r-card);background:#fff;
  margin-bottom:12px;overflow:hidden;box-shadow:var(--sh1);
}
.faq .accordion-button{
  position:relative;display:flex;align-items:center;gap:14px;
  font-size:16px;font-weight:600;color:var(--ink);background:#fff;
  padding:20px 24px;box-shadow:none!important;border-radius:var(--r-card)!important;
}
.faq .accordion-button:not(.collapsed){color:var(--brand-700);background:var(--brand-50)}
.faq .accordion-button:not(.collapsed)::before{
  content:"";position:absolute;left:0;top:14px;bottom:14px;width:3px;
  background:var(--brand-600);border-radius:0 3px 3px 0;
}
.faq .accordion-button::after{
  content:"+";background-image:none;width:auto;height:auto;margin-left:auto;
  font-size:20px;font-weight:400;color:var(--brand-600);line-height:1;
  display:flex;align-items:center;transform:none;
}
.faq .accordion-button:not(.collapsed)::after{content:"−";transform:none}
.faq .accordion-body{padding:18px 24px 22px;font-size:15px;color:var(--text);line-height:1.85}

/* ============ 底部 CTA ============ */
.end-cta{background:var(--deep);padding:64px 0}
.end-cta .inner{text-align:center;display:grid;gap:22px;justify-items:center}
.end-cta h2{color:#fff;font-size:30px;line-height:1.4}
.end-cta p{color:#B9C3D6;font-size:15px;max-width:620px}
.end-cta .actions{display:flex;gap:14px;flex-wrap:wrap;justify-content:center}
.end-cta .btn-outline{background:transparent;border-color:rgba(255,255,255,.34);color:#fff}
.end-cta .btn-outline:hover{background:rgba(255,255,255,.12);border-color:#fff;color:#fff}

/* ============ 页脚 ============ */
.site-footer{background:var(--soft);border-top:1px solid var(--line);padding:64px 0 28px;margin-top:0}
.foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1.2fr 1.1fr 1fr;gap:32px}
.foot-brand .logo{margin-bottom:16px}
.foot-brand p{font-size:14px;line-height:1.8;color:var(--text);margin-bottom:16px}
.tag-row{display:flex;flex-wrap:wrap;gap:8px}
.tag{
  font-size:12px;color:var(--brand-700);background:#fff;border:1px solid var(--line);
  border-radius:999px;padding:4px 12px;transition:all .18s ease-out;
}
.tag:hover{border-color:var(--brand-600);background:var(--brand-50);color:var(--brand-700)}
.foot-col h3{font-size:14px;font-weight:700;margin-bottom:14px}
.foot-col a{display:block;font-size:14px;color:var(--text);margin-bottom:10px}
.foot-col a:hover{color:var(--brand-600)}
.foot-col ul li{font-size:14px;color:var(--text);margin-bottom:10px;line-height:1.7}
.foot-bottom{
  margin-top:40px;padding-top:20px;border-top:1px solid var(--line);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:var(--muted);
}
.foot-bottom .links{display:flex;gap:18px;flex-wrap:wrap}
.foot-bottom .links a{color:var(--muted)}
.foot-bottom .links a:hover{color:var(--brand-600)}

/* ============ 回到顶部 ============ */
.to-top{
  position:fixed;right:24px;bottom:24px;width:48px;height:48px;border-radius:50%;
  background:#fff;border:1px solid var(--line);color:var(--brand-600);
  box-shadow:var(--sh2);display:grid;place-items:center;cursor:pointer;
  opacity:0;visibility:hidden;transition:all .18s ease-out;z-index:900;
}
.to-top.show{opacity:1;visibility:visible}
.to-top:hover{transform:translateY(-2px);box-shadow:var(--sh3);border-color:var(--brand-600)}

/* ============ 动效 ============ */
.reveal{opacity:0;transform:translateY(12px)}
.reveal.in{opacity:1;transform:none;transition:opacity .24s ease-out,transform .24s ease-out}

/* ============ 响应式 ============ */
@media (max-width:1199px){
  .wrap{padding:0 24px}
  .cat-hero h1{font-size:38px}
  .split{gap:36px}
  .cmd-search{width:200px}
}
@media (max-width:991px){
  .sec{padding:72px 0}
  .nav-inner{height:60px;gap:12px}
  .burger{display:grid;place-items:center}
  .nav-menu{
    position:fixed;top:60px;left:0;right:0;z-index:1000;
    flex-direction:column;align-items:stretch;gap:0;
    background:#fff;border-bottom:1px solid var(--line);
    padding:74px 20px 96px;
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity .18s ease-out,transform .18s ease-out;
    max-height:calc(100vh - 60px);overflow-y:auto;
  }
  body.nav-open .nav-menu{opacity:1;visibility:visible;transform:none}
  .nav-menu a{font-size:16px;padding:14px 0;border-bottom:1px solid var(--line)}
  .nav-menu a::after{display:none}
  .cmd-search{display:none}
  body.nav-open .cmd-search{
    display:flex;position:fixed;top:72px;left:20px;right:20px;width:auto;z-index:1100;
    background:#fff;
  }
  .nav-cta{display:none}
  body.nav-open .nav-cta{
    display:flex;position:fixed;left:20px;right:20px;bottom:20px;z-index:1100;width:auto;
  }
  .cat-hero{padding:36px 0 68px}
  .cat-hero-inner{grid-template-columns:1fr;gap:36px}
  .cat-hero h1{font-size:34px}
  .hero-float{position:static;margin-top:16px;max-width:none}
  .spec-grid{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .plan-grid{grid-template-columns:1fr}
  .plan.is-hot{order:-1}
  .plan .flag{position:static;display:inline-block;margin-bottom:12px}
  .trouble{grid-template-columns:1fr}
  .split{grid-template-columns:1fr;gap:28px}
  .foot-grid{grid-template-columns:repeat(2,1fr)}
  .sec-head h2,.split h2{font-size:28px}
}
@media (max-width:767px){
  .sec{padding:56px 0}
  .wrap{padding:0 16px}
  .logo-text span{display:none}
  .cat-hero h1{font-size:30px;line-height:1.3}
  .cat-hero .lead{font-size:16px}
  .hero-actions{flex-direction:column;align-items:stretch}
  .hero-actions .btn-main{width:100%}
  .spec-grid{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  .sec-head h2,.split h2{font-size:24px}
  .sec-head.row-head{flex-direction:column;align-items:flex-start;gap:12px}
  .foot-grid{grid-template-columns:1fr;gap:26px}
  .foot-bottom{flex-direction:column;align-items:flex-start}
  .end-cta h2{font-size:23px}
  .end-cta .actions{flex-direction:column;width:100%}
  .end-cta .actions .btn-main{width:100%}
  .to-top{right:16px;bottom:16px}
}

/* roulang page: category2 */
:root{
  --brand-600:#1557E0;
  --brand-700:#0F3FA8;
  --brand-50:#EAF0FF;
  --accent:#FF6B35;
  --accent-700:#E2541F;
  --accent-50:#FFF1EA;
  --success:#12B886;
  --warning:#F59E0B;
  --error:#E5484D;
  --ink:#101828;
  --body-c:#475467;
  --muted:#98A2B3;
  --line:#E4E7EC;
  --soft:#F6F8FC;
  --deep:#101B33;
  --card:#FFFFFF;
  --r-card:16px;
  --r-lg:20px;
  --r-btn:10px;
  --shadow-1:0 1px 2px rgba(16,24,40,.06);
  --shadow-2:0 8px 24px -6px rgba(16,24,40,.10);
  --shadow-3:0 16px 40px -12px rgba(21,87,224,.22);
  --bs-primary:#1557E0;
  --bs-primary-rgb:21,87,224;
  --bs-body-color:#475467;
  --bs-body-font-family:'HarmonyOS Sans SC','PingFang SC','Microsoft YaHei',system-ui,-apple-system,sans-serif;
  --bs-border-radius:16px;
  --bs-border-color:#E4E7EC;
  --bs-link-color:#1557E0;
  --bs-link-hover-color:#0F3FA8;
  --bs-font-sans-serif:'HarmonyOS Sans SC','PingFang SC','Microsoft YaHei',system-ui,-apple-system,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:'HarmonyOS Sans SC','PingFang SC','Microsoft YaHei',system-ui,-apple-system,sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--body-c);
  background:#fff;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border-style:none}
a{color:var(--brand-600);text-decoration:none;transition:color .18s ease-out}
a:hover{color:var(--brand-700)}
h1,h2,h3,h4{color:var(--ink);font-weight:700;margin:0;letter-spacing:-.01em}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
button{font-family:inherit}
:focus-visible{outline:2px solid var(--brand-600);outline-offset:2px;border-radius:6px}

.wrap{max-width:1200px;margin:0 auto;padding:0 24px;width:100%}
.num{font-variant-numeric:tabular-nums;font-feature-settings:"tnum"}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:1030;
  background:rgba(255,255,255,.88);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
  transition:box-shadow .18s ease-out;
}
.site-header.is-scrolled{box-shadow:var(--shadow-1)}
.nav-inner{display:flex;align-items:center;gap:24px;height:72px}
.logo{display:flex;align-items:center;gap:12px;flex:0 0 auto}
.logo-mark{
  width:38px;height:38px;border-radius:11px;
  background:var(--brand-600);color:#fff;display:grid;place-items:center;
  font-size:16px;box-shadow:var(--shadow-2);
}
.logo-text{display:flex;flex-direction:column;line-height:1.2}
.logo-text b{font-size:16px;font-weight:700;color:var(--ink)}
.logo-text span{font-size:12px;color:var(--muted);letter-spacing:.01em}
.nav-menu{display:flex;align-items:center;gap:2px;margin-left:8px}
.nav-menu a{
  position:relative;padding:8px 12px;font-size:14px;font-weight:500;color:var(--body-c);
  border-radius:8px;white-space:nowrap;transition:color .18s ease-out,background .18s ease-out;
}
.nav-menu a::after{
  content:"";position:absolute;left:12px;right:12px;bottom:2px;height:2px;border-radius:2px;
  background:var(--brand-600);transform:scaleX(0);transform-origin:left;transition:transform .18s ease-out;
}
.nav-menu a:hover{color:var(--ink)}
.nav-menu a:hover::after{transform:scaleX(1)}
.nav-menu a.active{color:var(--brand-600);font-weight:600}
.nav-menu a.active::after{transform:scaleX(1)}
.nav-right{display:flex;align-items:center;gap:12px;margin-left:auto}
.cmd-search{
  display:flex;align-items:center;gap:8px;width:248px;height:40px;padding:0 12px;
  background:var(--soft);border:1px solid var(--line);border-radius:var(--r-btn);
  color:var(--muted);font-size:13px;cursor:text;transition:border-color .18s ease-out,background .18s ease-out;
}
.cmd-search:hover{border-color:#cfd8ee;background:#fff}
.cmd-search i{font-size:13px;color:var(--muted)}
.cmd-search .kbd{
  margin-left:auto;font-size:11px;color:var(--muted);background:#fff;
  border:1px solid var(--line);border-radius:6px;padding:1px 6px;line-height:1.6;
}
.icon-btn{
  width:40px;height:40px;border-radius:var(--r-btn);border:1px solid var(--line);background:#fff;
  color:var(--body-c);display:grid;place-items:center;font-size:15px;transition:all .18s ease-out;
}
.icon-btn:hover{background:var(--brand-50);border-color:var(--brand-50);color:var(--brand-700)}
.btn-main{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 24px;border:1px solid transparent;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;background:var(--brand-600);color:#fff;cursor:pointer;
  transition:background .18s ease-out,transform .18s ease-out,box-shadow .18s ease-out,color .18s ease-out,border-color .18s ease-out;
}
.btn-main:hover{background:var(--brand-700);color:#fff;transform:translateY(-1px);box-shadow:var(--shadow-3)}
.btn-main:active{transform:translateY(0)}
.btn-accent{background:var(--accent)}
.btn-accent:hover{background:var(--accent-700)}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{background:var(--brand-50);border-color:var(--brand-50);color:var(--brand-700);box-shadow:var(--shadow-2)}
.btn-line{background:transparent;border-color:rgba(255,255,255,.45);color:#fff}
.btn-line:hover{background:rgba(255,255,255,.12);border-color:#fff;color:#fff;box-shadow:none}
.nav-cta{height:40px;padding:0 20px;font-size:14px}
.burger{
  display:none;width:40px;height:40px;border-radius:var(--r-btn);border:1px solid var(--line);
  background:#fff;color:var(--ink);font-size:16px;place-items:center;cursor:pointer;
}
.burger:hover{background:var(--soft)}

/* ---------- hero ---------- */
.cat-hero{
  background:linear-gradient(180deg,#FFFFFF 0%,var(--brand-50) 100%);
  border-bottom:1px solid var(--line);
  padding:32px 0 56px;
}
.crumb{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);flex-wrap:wrap}
.crumb a{color:var(--muted)}
.crumb a:hover{color:var(--brand-600)}
.crumb span.sep{color:#CBD5E1}
.crumb .now{color:var(--body-c);font-weight:500}
.hero-grid{display:grid;grid-template-columns:7fr 5fr;gap:48px;align-items:center;margin-top:28px}
.hero-eyebrow{
  display:inline-flex;align-items:center;gap:8px;height:30px;padding:0 14px;border-radius:999px;
  background:#fff;border:1px solid var(--line);color:var(--brand-700);font-size:13px;font-weight:600;
}
.hero-text h1{font-size:44px;line-height:1.25;margin:18px 0 14px}
.hero-text .lead{font-size:17px;color:var(--body-c);max-width:560px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}
.hero-strip{display:flex;flex-wrap:wrap;gap:10px 0;margin-top:24px;font-size:14px;color:var(--body-c)}
.hero-strip span{display:inline-flex;align-items:center;gap:8px}
.hero-strip span + span::before{content:"/";color:#CBD5E1;margin:0 12px}
.hero-visual{position:relative}
.hero-visual img{
  width:100%;aspect-ratio:16/11;object-fit:cover;border-radius:var(--r-lg);
  background:var(--soft);box-shadow:var(--shadow-2);
}
.hero-float{
  position:absolute;left:20px;bottom:20px;background:rgba(255,255,255,.94);
  border:1px solid var(--line);border-radius:14px;padding:12px 16px;box-shadow:var(--shadow-2);
  display:flex;align-items:center;gap:12px;
}
.hero-float .sq{
  width:44px;height:44px;border-radius:12px;background:var(--brand-50);color:var(--brand-700);
  display:grid;place-items:center;font-weight:700;font-size:13px;line-height:1.15;text-align:center;
}
.hero-float p{font-size:13px;color:var(--body-c);max-width:190px;line-height:1.6}

/* ---------- sections ---------- */
.section{padding:96px 0}
.section--soft{background:var(--soft)}
.sec-head{max-width:720px}
.sec-eyebrow{
  display:inline-block;font-size:13px;font-weight:700;color:var(--brand-600);
  letter-spacing:.08em;margin-bottom:12px;
}
.sec-head h2{font-size:32px;line-height:1.35}
.sec-head .sec-lead{margin-top:14px;font-size:16px;color:var(--body-c)}
.sec-head-row{display:flex;align-items:flex-end;justify-content:space-between;gap:32px;flex-wrap:wrap}
.link-more{display:inline-flex;align-items:center;gap:8px;font-size:15px;font-weight:600}
.link-more i{transition:transform .18s ease-out;font-size:12px}
.link-more:hover i{transform:translateX(3px)}

/* metrics */
.metric-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:44px}
.metric{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r-card);
  padding:24px;box-shadow:var(--shadow-1);transition:transform .18s ease-out,box-shadow .18s ease-out,border-color .18s ease-out;
}
.metric:hover{transform:translateY(-4px);box-shadow:var(--shadow-2);border-color:#d6e0fb}
.metric b{display:block;font-size:32px;line-height:1.2;color:var(--ink);font-weight:700;font-variant-numeric:tabular-nums}
.metric b em{font-style:normal;font-size:15px;font-weight:600;color:var(--body-c);margin-left:4px}
.metric p{margin-top:8px;font-size:14px;color:var(--body-c)}

/* ability list */
.ability-list{margin-top:56px;border-top:1px solid var(--line)}
.ability{
  display:grid;grid-template-columns:64px 1fr auto;gap:20px;align-items:start;
  padding:26px 4px;border-bottom:1px solid var(--line);transition:background .18s ease-out;
}
.ability:hover{background:#fff}
.ability .idx{font-size:14px;font-weight:700;color:var(--brand-600);letter-spacing:.06em;padding-top:3px}
.ability h3{font-size:20px;line-height:1.5;margin-bottom:6px}
.ability p{font-size:15px;color:var(--body-c);max-width:760px}
.badge-pill{
  display:inline-flex;align-items:center;height:26px;padding:0 12px;border-radius:999px;
  font-size:13px;font-weight:600;background:var(--brand-50);color:var(--brand-700);white-space:nowrap;
}
.badge-accent{background:var(--accent-50);color:var(--accent-700)}
.badge-soft{background:var(--soft);color:var(--body-c);border:1px solid var(--line)}
.badge-ok{background:#E7F8F2;color:#0B8F6A}

/* steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:64px;position:relative}
.steps::before{content:"";position:absolute;top:0;left:48px;right:48px;height:2px;background:var(--line)}
.step{
  position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--r-card);
  padding:40px 24px 24px;box-shadow:var(--shadow-1);
  transition:transform .18s ease-out,box-shadow .18s ease-out,border-color .18s ease-out;
}
.step:hover{transform:translateY(-4px);box-shadow:var(--shadow-2);border-color:#d6e0fb}
.step .no{
  position:absolute;top:-23px;left:24px;width:46px;height:46px;border-radius:13px;
  background:var(--brand-600);color:#fff;display:grid;place-items:center;
  font-size:15px;font-weight:700;box-shadow:var(--shadow-2);font-variant-numeric:tabular-nums;
}
.step h3{font-size:20px;line-height:1.45;margin-bottom:10px}
.step p{font-size:15px;color:var(--body-c)}
.step ul{margin-top:14px;border-top:1px dashed var(--line);padding-top:14px}
.step li{position:relative;padding-left:16px;font-size:14px;color:var(--body-c);margin-bottom:6px}
.step li::before{content:"";position:absolute;left:0;top:11px;width:6px;height:6px;border-radius:50%;background:var(--brand-50);border:1px solid var(--brand-600)}

/* risk table */
.table-card{
  margin-top:40px;background:#fff;border:1px solid var(--line);border-radius:var(--r-card);
  box-shadow:var(--shadow-1);overflow:hidden;
}
.table-wrap{overflow-x:auto}
.risk-table{width:100%;border-collapse:collapse;min-width:720px}
.risk-table th{
  text-align:left;font-size:13px;font-weight:700;color:var(--muted);letter-spacing:.05em;
  padding:18px 24px;background:var(--soft);border-bottom:1px solid var(--line);white-space:nowrap;
}
.risk-table td{
  padding:20px 24px;border-bottom:1px solid var(--line);font-size:15px;color:var(--body-c);
  vertical-align:top;transition:background .18s ease-out;
}
.risk-table tbody tr:last-child td{border-bottom:0}
.risk-table tbody tr:hover td{background:#FAFBFF}
.risk-table td:first-child{color:var(--ink);font-weight:600}
.risk-table .t-time{font-variant-numeric:tabular-nums;color:var(--brand-700);font-weight:600;white-space:nowrap}

/* split */
.split{display:grid;grid-template-columns:7fr 5fr;gap:56px;align-items:center}
.check-list{margin-top:32px}
.check-list li{display:flex;gap:14px;padding:16px 0;border-bottom:1px solid var(--line)}
.check-list li:last-child{border-bottom:0}
.check-list .ic{
  flex:0 0 26px;width:26px;height:26px;border-radius:8px;background:var(--brand-50);color:var(--brand-600);
  display:grid;place-items:center;font-size:12px;margin-top:3px;
}
.check-list b{display:block;font-size:16px;color:var(--ink);font-weight:600;margin-bottom:2px}
.check-list p{font-size:14.5px;color:var(--body-c)}
.figure-card{position:relative;border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--shadow-2);border:1px solid var(--line);background:var(--soft)}
.figure-card img{width:100%;aspect-ratio:4/3;object-fit:cover}
.figure-card figcaption{
  position:absolute;left:0;right:0;bottom:0;padding:28px 24px 22px;color:#fff;font-size:14px;
  background:linear-gradient(180deg,rgba(16,27,51,0) 0%,rgba(16,27,51,.82) 100%);
}
.tip-card{
  margin-top:20px;background:var(--brand-50);border:1px solid #D7E2FF;border-radius:var(--r-card);
  padding:20px 22px;display:flex;gap:14px;align-items:flex-start;
}
.tip-card i{color:var(--brand-600);font-size:18px;margin-top:2px}
.tip-card p{font-size:14.5px;color:var(--body-c)}

/* faq */
.faq{margin-top:40px;max-width:900px}
.faq .accordion-item{
  border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;
  background:#fff;margin-bottom:12px;box-shadow:var(--shadow-1);
}
.faq .accordion-button{
  position:relative;width:100%;display:flex;align-items:center;
  padding:20px 24px;font-size:16px;font-weight:600;color:var(--ink);background:#fff;
  box-shadow:none;border:0;transition:background .18s ease-out,color .18s ease-out;
}
.faq .accordion-button::before{
  content:"";position:absolute;left:0;top:14px;bottom:14px;width:3px;border-radius:0 3px 3px 0;
  background:var(--brand-600);opacity:0;transition:opacity .18s ease-out;
}
.faq .accordion-button:not(.collapsed){color:var(--brand-700);background:var(--brand-50)}
.faq .accordion-button:not(.collapsed)::before{opacity:1}
.faq .accordion-button::after{
  content:"+";background-image:none;width:28px;height:28px;border-radius:50%;flex:0 0 28px;
  display:grid;place-items:center;background-color:var(--brand-50);color:var(--brand-600);
  font-size:18px;font-weight:600;line-height:1;margin-left:16px;transform:none;
}
.faq .accordion-button:not(.collapsed)::after{content:"−";background-color:var(--brand-600);color:#fff;transform:none}
.faq .accordion-button:focus{box-shadow:0 0 0 3px rgba(21,87,224,.16)}
.faq .accordion-body{padding:6px 24px 22px;font-size:15px;color:var(--body-c);background:#fff}
.faq .accordion-body p + p{margin-top:10px}

/* cta band */
.cta-band{background:var(--deep);padding:64px 0}
.cta-band h2{color:#fff;font-size:30px;line-height:1.4;text-align:center}
.cta-band p{color:#B9C4DA;text-align:center;margin-top:14px;font-size:16px}
.cta-actions{display:flex;justify-content:center;gap:14px;flex-wrap:wrap;margin-top:28px}

/* footer */
.site-footer{background:var(--soft);border-top:1px solid var(--line);padding:64px 0 0}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1.2fr 1.2fr 1.2fr;gap:40px}
.foot-brand p{margin-top:18px;font-size:14px;color:var(--body-c);max-width:340px}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.tag{
  display:inline-flex;align-items:center;height:28px;padding:0 12px;border-radius:999px;
  background:#fff;border:1px solid var(--line);font-size:13px;color:var(--body-c);transition:all .18s ease-out;
}
.tag:hover{border-color:var(--brand-50);background:var(--brand-50);color:var(--brand-700)}
.foot-col h3{font-size:14px;font-weight:700;color:var(--ink);margin-bottom:16px}
.foot-col a{display:block;font-size:14px;color:var(--body-c);padding:6px 0;transition:color .18s ease-out,transform .18s ease-out}
.foot-col a:hover{color:var(--brand-600);transform:translateX(2px)}
.foot-col ul li{font-size:14px;color:var(--body-c);padding:6px 0}
.foot-bottom{
  margin-top:48px;border-top:1px solid var(--line);padding:22px 0 28px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:var(--muted);
}
.foot-bottom .links{display:flex;gap:20px;flex-wrap:wrap}
.foot-bottom .links a{color:var(--muted)}
.foot-bottom .links a:hover{color:var(--brand-600)}

/* to top */
.to-top{
  position:fixed;right:32px;bottom:32px;width:48px;height:48px;border-radius:50%;
  background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-2);color:var(--brand-600);
  display:grid;place-items:center;font-size:15px;cursor:pointer;z-index:1000;
  opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity .18s ease-out,transform .18s ease-out,visibility .18s ease-out,background .18s ease-out;
}
.to-top.show{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:var(--brand-50)}

/* reveal */
html.js .reveal{opacity:0;transform:translateY(12px);transition:opacity .24s ease-out,transform .24s ease-out}
html.js .reveal.is-in{opacity:1;transform:none}

/* responsive */
@media (max-width:1199px){
  .hero-grid{gap:36px}
  .hero-text h1{font-size:38px}
  .split{gap:40px}
  .foot-grid{grid-template-columns:1.5fr 1fr 1fr;gap:32px}
}
@media (max-width:991px){
  .nav-inner{height:60px;gap:12px}
  .cmd-search,.nav-cta{display:none}
  .burger{display:grid}
  .nav-menu{
    position:fixed;top:60px;left:0;right:0;bottom:0;background:#fff;
    flex-direction:column;align-items:stretch;gap:0;margin:0;padding:16px 20px 100px;
    overflow-y:auto;z-index:1020;opacity:0;transform:translateY(-8px);pointer-events:none;
    transition:opacity .18s ease-out,transform .18s ease-out;
  }
  .nav-menu.is-open{opacity:1;transform:none;pointer-events:auto}
  .nav-menu a{padding:15px 4px;font-size:15px;border-bottom:1px solid var(--line);border-radius:0}
  .nav-menu a::after{display:none}
  .section{padding:72px 0}
  .hero-grid{grid-template-columns:1fr;gap:32px}
  .hero-text h1{font-size:34px}
  .hero-visual img{aspect-ratio:16/9}
  .metric-grid{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr);gap:40px 24px}
  .steps::before{display:none}
  .step .no{position:static;margin-bottom:16px}
  .step{padding:24px}
  .split{grid-template-columns:1fr;gap:32px}
  .foot-grid{grid-template-columns:1fr 1fr;gap:32px}
  .sec-head h2{font-size:28px}
}
@media (max-width:767px){
  .wrap{padding:0 16px}
  .section{padding:56px 0}
  .hero-text h1{font-size:30px;line-height:1.35}
  .hero-text .lead{font-size:16px}
  .hero-actions .btn-main{width:100%}
  .hero-strip{flex-direction:column;gap:8px}
  .hero-strip span + span::before{display:none}
  .hero-strip span::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--brand-600);display:inline-block}
  .metric-grid{grid-template-columns:1fr;gap:16px}
  .steps{grid-template-columns:1fr}
  .ability{grid-template-columns:1fr;gap:10px}
  .ability .idx{padding-top:0}
  .sec-head h2{font-size:24px}
  .cta-band h2{font-size:23px}
  .cta-actions .btn-main{width:100%}
  .to-top{right:16px;bottom:16px;width:44px;height:44px}
  .foot-grid{grid-template-columns:1fr;gap:28px}
  .foot-bottom{flex-direction:column;align-items:flex-start}
}

/* roulang page: category3 */
:root{
  --brand-600:#1557E0;
  --brand-700:#0F3FA8;
  --brand-50:#EAF0FF;
  --accent:#FF6B35;
  --accent-50:#FFF1EA;
  --success:#12B886;
  --warning:#F59E0B;
  --error:#E5484D;
  --ink:#101828;
  --txt:#475467;
  --muted:#98A2B3;
  --line:#E4E7EC;
  --soft:#F6F8FC;
  --card:#FFFFFF;
  --deep:#101B33;
  --r-card:16px;
  --r-lg:20px;
  --r-btn:10px;
  --shadow-1:0 1px 2px rgba(16,24,40,.06);
  --shadow-2:0 8px 24px -6px rgba(16,24,40,.10);
  --shadow-3:0 16px 40px -12px rgba(21,87,224,.22);

  --bs-primary:#1557E0;
  --bs-body-color:#475467;
  --bs-body-font-family:'HarmonyOS Sans SC','PingFang SC','Microsoft YaHei',system-ui,sans-serif;
  --bs-border-radius:10px;
  --bs-border-color:#E4E7EC;
  --bs-link-color:#1557E0;
  --bs-link-hover-color:#0F3FA8;
  --bs-font-sans-serif:'HarmonyOS Sans SC','PingFang SC','Microsoft YaHei',system-ui,sans-serif;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;scroll-padding-top:88px;}
body{
  margin:0;
  font-family:'HarmonyOS Sans SC','PingFang SC','Microsoft YaHei',system-ui,sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--txt);
  background:#fff;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block;background:#EEF1F6;}
a{color:var(--brand-600);text-decoration:none;transition:color .18s ease-out;}
a:hover{color:var(--brand-700);}
h1,h2,h3,h4{margin:0;color:var(--ink);font-weight:700;line-height:1.3;}
p{margin:0 0 16px;}
ul{margin:0;padding:0;list-style:none;}
button{font-family:inherit;}
a:focus-visible,button:focus-visible,.form-control:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{
  outline:2px solid var(--brand-600);outline-offset:2px;
}
.num{font-variant-numeric:tabular-nums;}
.gap4{display:inline-block;width:4px;}

.wrap{width:100%;max-width:1200px;margin:0 auto;padding:0 24px;}
.section{padding:96px 0;}
.section-soft{background:var(--soft);}
.section-tint{background:linear-gradient(180deg,#fff 0%,var(--brand-50) 100%);}

.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;font-weight:600;color:var(--brand-600);
  background:var(--brand-50);border-radius:999px;padding:6px 14px;margin-bottom:16px;
}
.sec-head{max-width:720px;margin-bottom:48px;}
.sec-head h2{font-size:32px;letter-spacing:-.01em;margin-bottom:14px;}
.sec-head p{font-size:16px;color:var(--txt);margin:0;max-width:42ch;}

/* ============ 导航 ============ */
.site-header{
  position:sticky;top:0;z-index:1030;
  background:rgba(255,255,255,.88);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
  transition:box-shadow .18s ease-out;
}
.site-header.is-scrolled{box-shadow:var(--shadow-1);}
.nav-inner{display:flex;align-items:center;gap:28px;height:72px;}
.logo{display:flex;align-items:center;gap:12px;flex:0 0 auto;}
.logo-mark{
  width:40px;height:40px;border-radius:12px;flex:0 0 40px;
  display:grid;place-items:center;
  background:linear-gradient(140deg,var(--brand-600),#3B79F0);
  color:#fff;font-size:18px;box-shadow:var(--shadow-1);
}
.logo-text{display:flex;flex-direction:column;line-height:1.25;}
.logo-text b{font-size:16px;font-weight:700;color:var(--ink);letter-spacing:-.01em;}
.logo-text span{font-size:11px;color:var(--muted);letter-spacing:.02em;}
.nav-menu{display:flex;align-items:center;gap:24px;flex:1 1 auto;min-width:0;}
.nav-menu a{
  position:relative;
  font-size:14px;font-weight:500;color:var(--txt);
  padding:6px 0;white-space:nowrap;
}
.nav-menu a::after{
  content:"";position:absolute;left:0;right:0;bottom:-4px;height:2px;
  background:var(--brand-600);border-radius:2px;
  transform:scaleX(0);transform-origin:left;
  transition:transform .18s ease-out;
}
.nav-menu a:hover{color:var(--ink);}
.nav-menu a:hover::after{transform:scaleX(1);}
.nav-menu a.active{color:var(--brand-600);font-weight:600;}
.nav-menu a.active::after{transform:scaleX(1);}
.nav-right{display:flex;align-items:center;gap:12px;flex:0 0 auto;}
.cmd-search{
  display:flex;align-items:center;gap:8px;
  width:236px;height:40px;padding:0 12px;
  background:var(--soft);border:1px solid var(--line);border-radius:10px;
  font-size:13px;color:var(--muted);cursor:text;
  transition:border-color .18s ease-out,box-shadow .18s ease-out;
}
.cmd-search:hover{border-color:#C9D8FF;}
.cmd-search i{color:var(--muted);font-size:13px;}
.cmd-search .kbd{
  margin-left:auto;font-size:11px;padding:2px 6px;border-radius:6px;
  background:#fff;border:1px solid var(--line);color:var(--muted);white-space:nowrap;
}
.icon-btn{
  width:40px;height:40px;border-radius:10px;
  display:grid;place-items:center;
  border:1px solid var(--line);background:#fff;color:var(--txt);font-size:15px;
  transition:all .18s ease-out;
}
.icon-btn:hover{border-color:var(--brand-600);color:var(--brand-600);background:var(--brand-50);}
.btn-main{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 22px;border-radius:var(--r-btn);
  font-size:14px;font-weight:600;white-space:nowrap;
  background:var(--brand-600);color:#fff;border:1px solid transparent;
  transition:all .18s ease-out;
}
.btn-main:hover{background:var(--brand-700);color:#fff;transform:translateY(-1px);box-shadow:var(--shadow-3);}
.btn-accent{background:var(--accent);}
.btn-accent:hover{background:#E85A26;}
.btn-ghost{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 22px;border-radius:var(--r-btn);
  font-size:14px;font-weight:600;white-space:nowrap;
  background:#fff;color:var(--ink);border:1px solid var(--line);
  transition:all .18s ease-out;
}
.btn-ghost:hover{border-color:var(--brand-600);color:var(--brand-600);background:var(--brand-50);}
.btn-quiet{
  display:inline-flex;align-items:center;gap:8px;
  font-size:14px;font-weight:600;color:var(--brand-600);background:none;border:0;padding:0;
}
.btn-quiet i{transition:transform .18s ease-out;}
.btn-quiet:hover i{transform:translateX(3px);}
.nav-cta{height:40px;padding:0 18px;}
.burger{
  display:none;width:40px;height:40px;border-radius:10px;
  place-items:center;background:#fff;border:1px solid var(--line);color:var(--ink);font-size:16px;
}
.burger:hover{border-color:var(--brand-600);color:var(--brand-600);}
.nav-scrim{
  position:fixed;inset:0;background:rgba(16,24,40,.32);
  opacity:0;pointer-events:none;transition:opacity .18s ease-out;z-index:1020;
}
.nav-scrim.show{opacity:1;pointer-events:auto;}
.nav-search-mobile{display:none;}

/* ============ 分类 Hero ============ */
.cat-hero{
  position:relative;overflow:hidden;
  background:linear-gradient(180deg,#FFFFFF 0%,var(--brand-50) 100%);
  padding:44px 0 72px;
}
.crumb{font-size:13px;color:var(--muted);display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:20px;}
.crumb a{color:var(--muted);}
.crumb a:hover{color:var(--brand-600);}
.crumb .sep{color:#CBD5E1;}
.crumb .now{color:var(--txt);}
.hero-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:48px;align-items:center;}
.hero-copy h1{font-size:44px;letter-spacing:-.02em;margin-bottom:16px;}
.hero-copy .sub{font-size:17px;color:var(--txt);margin-bottom:28px;max-width:36ch;}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:28px;}
.hero-bar{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 14px;
  font-size:14px;color:var(--txt);
}
.hero-bar .item{display:inline-flex;align-items:center;gap:6px;}
.hero-bar .item b{color:var(--ink);font-weight:700;}
.hero-bar .slash{color:#CBD5E1;}
.hero-media{position:relative;}
.hero-media img{
  width:100%;aspect-ratio:4/3;object-fit:cover;
  border-radius:var(--r-lg);box-shadow:var(--shadow-2);
}
.hero-float{
  position:absolute;left:-16px;bottom:24px;
  display:flex;align-items:center;gap:12px;
  background:rgba(255,255,255,.96);border:1px solid var(--line);
  border-radius:14px;padding:12px 16px;box-shadow:var(--shadow-2);
  backdrop-filter:blur(6px);
}
.hero-float b{font-size:22px;font-weight:700;color:var(--brand-600);font-variant-numeric:tabular-nums;}
.hero-float span{font-size:12px;color:var(--muted);line-height:1.4;max-width:10ch;display:block;}

/* ============ 指标卡 ============ */
.metric-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}
.metric-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r-card);
  padding:24px;box-shadow:var(--shadow-1);
  transition:transform .18s ease-out,box-shadow .18s ease-out,border-color .18s ease-out;
}
.metric-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-2);border-color:#C9D8FF;}
.metric-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px;}
.metric-top span{font-size:14px;font-weight:600;color:var(--txt);}
.metric-ico{
  width:36px;height:36px;border-radius:10px;display:grid;place-items:center;
  background:var(--brand-50);color:var(--brand-600);font-size:15px;
}
.metric-value{font-size:32px;font-weight:700;color:var(--ink);font-variant-numeric:tabular-nums;line-height:1.2;}
.metric-value small{font-size:14px;font-weight:600;color:var(--muted);margin-left:4px;}
.metric-note{font-size:13px;color:var(--muted);margin:10px 0 14px;line-height:1.6;}
.meter{height:6px;border-radius:999px;background:var(--soft);overflow:hidden;}
.meter i{display:block;height:100%;border-radius:999px;background:var(--brand-600);}
.meter i.good{background:var(--success);}
.meter i.warn{background:var(--warning);}

/* ============ 常见现象 ============ */
.scene-grid{display:grid;grid-template-columns:.86fr 1.14fr;gap:48px;align-items:center;}
.scene-media img{width:100%;aspect-ratio:3/3.4;object-fit:cover;border-radius:var(--r-lg);box-shadow:var(--shadow-2);}
.scene-list{display:flex;flex-direction:column;gap:14px;}
.scene-item{
  display:flex;gap:16px;padding:18px 20px;background:#fff;
  border:1px solid var(--line);border-radius:var(--r-card);box-shadow:var(--shadow-1);
  transition:transform .18s ease-out,box-shadow .18s ease-out,border-color .18s ease-out;
}
.scene-item:hover{transform:translateY(-2px);box-shadow:var(--shadow-2);border-color:#C9D8FF;}
.scene-ico{
  width:42px;height:42px;flex:0 0 42px;border-radius:12px;
  display:grid;place-items:center;background:var(--brand-50);color:var(--brand-600);font-size:16px;
}
.scene-item h3{font-size:16px;margin-bottom:6px;}
.scene-item p{font-size:14px;margin:0;color:var(--txt);line-height:1.7;}
.scene-item .fix{
  display:inline-flex;align-items:center;gap:6px;margin-top:8px;
  font-size:13px;font-weight:600;color:var(--brand-700);
}

/* ============ 排查步骤 ============ */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}
.step{
  position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--r-card);
  padding:28px 24px 24px;box-shadow:var(--shadow-1);
  transition:transform .18s ease-out,box-shadow .18s ease-out,border-color .18s ease-out;
}
.step:hover{transform:translateY(-4px);box-shadow:var(--shadow-2);border-color:#C9D8FF;}
.step-num{
  display:inline-flex;align-items:center;justify-content:center;
  width:40px;height:40px;border-radius:12px;margin-bottom:16px;
  background:var(--brand-50);color:var(--brand-600);
  font-size:15px;font-weight:700;font-variant-numeric:tabular-nums;
}
.step h3{font-size:17px;margin-bottom:8px;}
.step p{font-size:14px;line-height:1.7;margin:0 0 16px;color:var(--txt);}
.step .cost{
  display:inline-flex;align-items:center;gap:6px;
  font-size:12px;font-weight:600;color:var(--brand-700);
  background:var(--brand-50);border-radius:999px;padding:4px 10px;
}

/* ============ 深色参数带 ============ */
.deep-band{
  background:linear-gradient(180deg,rgba(16,27,51,.95),rgba(16,27,51,.98)),url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
  padding:96px 0;color:#C7D0E0;
}
.deep-band .eyebrow{background:rgba(255,255,255,.10);color:#A9BDFF;}
.deep-band h2{color:#fff;font-size:32px;margin-bottom:14px;}
.deep-band .sec-head p{color:#A7B2C6;}
.param-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.param-card{
  background:rgba(255,255,255,.045);
  border:1px solid rgba(255,255,255,.12);
  border-radius:var(--r-card);padding:26px 24px;
  transition:background .18s ease-out,border-color .18s ease-out;
}
.param-card:hover{background:rgba(255,255,255,.075);border-color:rgba(169,189,255,.45);}
.param-card h3{
  color:#fff;font-size:17px;margin-bottom:6px;
  display:flex;align-items:center;gap:10px;
}
.param-card h3 i{color:#8FA9FF;font-size:15px;}
.param-card .tip{font-size:13px;color:#8B98AE;margin-bottom:14px;}
.param-row{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:12px 0;border-bottom:1px dashed rgba(255,255,255,.12);
  font-size:14px;
}
.param-row:last-child{border-bottom:0;padding-bottom:0;}
.param-row span{color:#94A1B7;}
.param-row b{color:#fff;font-weight:600;font-variant-numeric:tabular-nums;}
.param-row b.ok{color:#5BE0B4;}

/* ============ 反馈表单 ============ */
.form-grid{display:grid;grid-template-columns:1.06fr .94fr;gap:48px;align-items:start;}
.form-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);
  padding:32px;box-shadow:var(--shadow-1);
}
.field{display:flex;flex-direction:column;gap:8px;margin-bottom:20px;}
.field label{font-size:14px;font-weight:600;color:var(--ink);}
.field .hint{font-size:12px;color:var(--muted);font-weight:400;}
.form-row2{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
.form-control,.form-select{
  height:44px;border:1px solid var(--line);border-radius:var(--r-btn);
  padding:0 14px;font-size:15px;color:var(--ink);background:#fff;
  transition:border-color .18s ease-out,box-shadow .18s ease-out;
  box-shadow:none!important;
}
.form-control::placeholder{color:var(--muted);}
.form-control:focus,.form-select:focus{
  border-color:var(--brand-600);
  box-shadow:0 0 0 4px rgba(21,87,224,.12)!important;
  outline:none;
}
textarea.form-control{height:auto;min-height:118px;padding:12px 14px;line-height:1.7;resize:vertical;}
.checkline{display:flex;align-items:flex-start;gap:10px;font-size:13px;color:var(--txt);margin:4px 0 20px;}
.checkline input{width:18px;height:18px;margin-top:2px;accent-color:var(--brand-600);flex:0 0 18px;}
.checkline a{font-weight:600;}
.form-tip{
  display:none;margin-top:16px;padding:12px 16px;border-radius:var(--r-btn);
  font-size:14px;background:#E9F9F3;color:#0B7A5B;border:1px solid #B7E9D6;
}
.form-tip.show{display:block;}
.promise{display:flex;flex-direction:column;gap:16px;margin-bottom:24px;}
.promise-item{display:flex;gap:14px;align-items:flex-start;}
.promise-ico{
  width:40px;height:40px;flex:0 0 40px;border-radius:12px;
  display:grid;place-items:center;background:var(--brand-50);color:var(--brand-600);font-size:15px;
}
.promise-item h3{font-size:15px;margin-bottom:4px;}
.promise-item p{font-size:14px;margin:0;line-height:1.7;}
.mini-card{
  background:var(--brand-50);border:1px solid #D5E0FF;border-radius:var(--r-card);
  padding:22px 24px;
}
.mini-card h3{font-size:15px;margin-bottom:10px;}
.mini-card ul li{
  display:flex;gap:10px;font-size:14px;color:var(--txt);padding:6px 0;
}
.mini-card ul li i{color:var(--brand-600);font-size:13px;margin-top:5px;}

/* ============ FAQ ============ */
.faq-wrap{max-width:900px;margin:0 auto;}
.accordion-item{
  border:1px solid var(--line)!important;border-radius:var(--r-card)!important;
  margin-bottom:12px;overflow:hidden;background:#fff;box-shadow:var(--shadow-1);
}
.accordion-button{
  position:relative;font-size:16px;font-weight:600;color:var(--ink);
  padding:20px 24px;background:#fff;box-shadow:none!important;
  display:flex;align-items:center;gap:16px;
  transition:background .18s ease-out,color .18s ease-out;
}
.accordion-button::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:3px;
  background:var(--brand-600);transform:scaleY(0);transition:transform .18s ease-out;
}
.accordion-button:not(.collapsed){color:var(--brand-700);background:var(--brand-50);}
.accordion-button:not(.collapsed)::before{transform:scaleY(1);}
.accordion-button::after{
  content:"+";background-image:none!important;
  width:28px;height:28px;flex:0 0 28px;margin-left:auto;
  display:grid;place-items:center;border-radius:8px;
  background:var(--brand-50);color:var(--brand-600);
  font-size:17px;font-weight:600;line-height:1;transform:none!important;
  transition:background .18s ease-out,color .18s ease-out;
}
.accordion-button:not(.collapsed)::after{content:"−";background:var(--brand-600);color:#fff;}
.accordion-body{padding:4px 24px 22px;font-size:15px;color:var(--txt);line-height:1.85;}

/* ============ 底部 CTA ============ */
.cta-band{background:var(--deep);padding:64px 0;}
.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;}
.cta-inner h2{color:#fff;font-size:28px;margin-bottom:8px;}
.cta-inner p{color:#A7B2C6;font-size:15px;margin:0;}
.cta-actions{display:flex;gap:12px;flex-wrap:wrap;}
.btn-light-ghost{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 22px;border-radius:var(--r-btn);
  font-size:14px;font-weight:600;white-space:nowrap;
  background:transparent;color:#fff;border:1px solid rgba(255,255,255,.35);
  transition:all .18s ease-out;
}
.btn-light-ghost:hover{background:rgba(255,255,255,.10);color:#fff;border-color:#fff;}

/* ============ 页脚 ============ */
.site-footer{background:var(--soft);border-top:1px solid var(--line);padding:72px 0 0;}
.foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1.3fr 1.2fr 1.2fr;gap:40px;}
.foot-brand .logo{margin-bottom:16px;}
.foot-brand p{font-size:14px;color:var(--txt);line-height:1.8;max-width:34ch;}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px;}
.tag{
  display:inline-flex;align-items:center;
  font-size:13px;padding:4px 12px;border-radius:999px;
  background:var(--brand-50);color:var(--brand-700);font-weight:500;
  transition:background .18s ease-out,color .18s ease-out;
}
.tag:hover{background:var(--brand-600);color:#fff;}
.foot-col h3{font-size:14px;font-weight:700;color:var(--ink);margin-bottom:16px;}
.foot-col a,.foot-col li{display:block;font-size:14px;color:var(--txt);margin-bottom:10px;line-height:1.7;}
.foot-col a:hover{color:var(--brand-600);}
.foot-bottom{
  margin-top:56px;border-top:1px solid var(--line);padding:24px 0;
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:var(--muted);
}
.foot-bottom .links{display:flex;gap:20px;flex-wrap:wrap;}
.foot-bottom .links a{color:var(--muted);}
.foot-bottom .links a:hover{color:var(--brand-600);}

/* ============ 回到顶部 ============ */
.to-top{
  position:fixed;right:24px;bottom:24px;z-index:1040;
  width:48px;height:48px;border-radius:50%;
  background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-2);
  color:var(--brand-600);font-size:16px;display:grid;place-items:center;
  opacity:0;pointer-events:none;transform:translateY(8px);
  transition:opacity .24s ease-out,transform .24s ease-out,background .18s ease-out;
}
.to-top.show{opacity:1;pointer-events:auto;transform:none;}
.to-top:hover{background:var(--brand-600);color:#fff;border-color:var(--brand-600);}

/* ============ 滚动淡入 ============ */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .24s ease-out,transform .24s ease-out;}
.reveal.in{opacity:1;transform:none;}

/* ============ Bootstrap 按钮重塑 ============ */
.btn{border-radius:var(--r-btn);font-weight:600;font-size:14px;transition:all .18s ease-out;}
.btn-primary{background:var(--brand-600);border-color:var(--brand-600);}
.btn-primary:hover{background:var(--brand-700);border-color:var(--brand-700);transform:translateY(-1px);}
.card{border-radius:var(--r-card);border-color:var(--line);box-shadow:var(--shadow-1);}
.badge{border-radius:999px;font-size:13px;font-weight:500;background:var(--brand-50);color:var(--brand-700);padding:4px 12px;}
.badge-accent{background:var(--accent-50);color:#C2410C;}

/* ============ 响应式 ============ */
@media (max-width:1199px){
  .nav-inner{gap:20px;}
  .nav-menu{gap:18px;}
  .nav-menu a{font-size:13px;}
  .cmd-search{width:190px;}
  .hero-grid{gap:36px;}
  .hero-copy h1{font-size:40px;}
  .scene-grid,.form-grid{gap:36px;}
}

@media (max-width:991px){
  html{scroll-padding-top:76px;}
  .wrap{padding:0 20px;}
  .section{padding:72px 0;}
  .deep-band{padding:72px 0;}
  .nav-inner{height:60px;}
  .nav-menu{
    position:fixed;top:60px;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:0;
    background:#fff;padding:16px 20px 24px;
    border-bottom:1px solid var(--line);box-shadow:var(--shadow-2);
    max-height:calc(100vh - 60px);overflow-y:auto;
    opacity:0;transform:translateY(-8px);pointer-events:none;
    transition:opacity .18s ease-out,transform .18s ease-out;
  }
  .nav-menu.open{opacity:1;transform:none;pointer-events:auto;}
  .nav-menu a{padding:14px 2px;border-bottom:1px solid var(--line);font-size:15px;font-weight:500;}
  .nav-menu a::after{display:none;}
  .nav-menu a.active{color:var(--brand-600);}
  .nav-search-mobile{
    display:flex;align-items:center;gap:8px;
    height:44px;padding:0 14px;margin-bottom:12px;
    background:var(--soft);border:1px solid var(--line);border-radius:10px;
    font-size:14px;color:var(--muted);
  }
  .nav-search-mobile i{font-size:14px;}
  .cmd-search,.icon-btn{display:none;}
  .burger{display:grid;}
  .hero-grid{grid-template-columns:1fr;gap:32px;}
  .hero-copy h1{font-size:36px;}
  .hero-media{order:-1;}
  .hero-media img{aspect-ratio:16/9;}
  .hero-float{left:16px;bottom:-14px;}
  .metric-grid{grid-template-columns:repeat(2,1fr);gap:20px;}
  .scene-grid{grid-template-columns:1fr;}
  .scene-media img{aspect-ratio:16/10;}
  .steps{grid-template-columns:repeat(2,1fr);gap:20px;}
  .param-grid{grid-template-columns:1fr;gap:20px;}
  .form-grid{grid-template-columns:1fr;}
  .foot-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .cta-inner{flex-direction:column;align-items:flex-start;}
  .sec-head h2{font-size:28px;}
  .deep-band h2{font-size:28px;}
}

@media (max-width:767px){
  .wrap{padding:0 16px;}
  .section{padding:56px 0;}
  .deep-band{padding:56px 0;}
  .logo-text span{display:none;}
  .logo-text b{font-size:15px;}
  .nav-right{gap:8px;}
  .btn-main,.btn-ghost,.btn-light-ghost{width:100%;}
  .nav-cta{display:none;}
  .hero-copy h1{font-size:30px;}
  .hero-copy .sub{font-size:16px;}
  .hero-actions{gap:10px;}
  .hero-bar{font-size:13px;gap:8px 10px;}
  .metric-grid,.steps{grid-template-columns:1fr;}
  .metric-value{font-size:28px;}
  .metric-card{padding:20px;}
  .scene-item{padding:16px;}
  .form-card{padding:22px 20px;}
  .form-row2{grid-template-columns:1fr;}
  .sec-head{margin-bottom:32px;}
  .sec-head h2{font-size:24px;}
  .deep-band h2{font-size:24px;}
  .cta-inner h2{font-size:22px;}
  .faq-wrap{max-width:100%;}
  .accordion-button{padding:16px 18px;font-size:15px;}
  .accordion-body{padding:2px 18px 18px;}
  .foot-grid{grid-template-columns:1fr;gap:28px;}
  .site-footer{padding:56px 0 0;}
  .foot-bottom{flex-direction:column;align-items:flex-start;gap:10px;}
  .to-top{right:16px;bottom:16px;width:44px;height:44px;}
}

/* roulang page: category4 */
:root{
  --brand-600:#1557E0;
  --brand-700:#0F3FA8;
  --brand-50:#EAF0FF;
  --accent:#FF6B35;
  --accent-50:#FFF1EB;
  --success:#12B886;
  --warning:#F59E0B;
  --error:#E5484D;
  --ink:#101828;
  --text:#475467;
  --muted:#98A2B3;
  --line:#E4E7EC;
  --soft:#F6F8FC;
  --card:#FFFFFF;
  --deep:#101B33;
  --r-card:16px;
  --r-lg:20px;
  --r-btn:10px;
  --r-pill:999px;
  --sh1:0 1px 2px rgba(16,24,40,.06);
  --sh2:0 8px 24px -6px rgba(16,24,40,.10);
  --sh3:0 16px 40px -12px rgba(21,87,224,.22);

  --bs-primary:#1557E0;
  --bs-body-color:#475467;
  --bs-body-bg:#FFFFFF;
  --bs-border-color:#E4E7EC;
  --bs-border-radius:16px;
  --bs-font-sans-serif:'HarmonyOS Sans SC','PingFang SC','Microsoft YaHei',system-ui,sans-serif;
  --bs-link-color:#1557E0;
  --bs-link-hover-color:#0F3FA8;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:'HarmonyOS Sans SC','PingFang SC','Microsoft YaHei',system-ui,sans-serif;
  font-size:16px;
  line-height:1.75;
  color:var(--text);
  background:#fff;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--brand-600);text-decoration:none;transition:color .18s ease-out}
a:hover{color:var(--brand-700)}
button,input,select,textarea{font-family:inherit;font-size:inherit}
h1,h2,h3,h4{margin:0;color:var(--ink);font-weight:700;letter-spacing:.2px}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--brand-600);outline-offset:2px;border-radius:6px}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px;width:100%}
.num{font-variant-numeric:tabular-nums}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:1030;
  background:rgba(255,255,255,.88);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
  transition:box-shadow .18s ease-out;
}
.site-header.scrolled{box-shadow:var(--sh1)}
.nav-inner{display:flex;align-items:center;gap:24px;height:72px}
.logo{display:flex;align-items:center;gap:12px;flex:0 0 auto}
.logo-mark{
  width:38px;height:38px;border-radius:11px;
  background:linear-gradient(160deg,var(--brand-600),var(--brand-700));
  color:#fff;display:flex;align-items:center;justify-content:center;font-size:17px;
  box-shadow:0 6px 16px -6px rgba(21,87,224,.55);
}
.logo-text{display:flex;flex-direction:column;line-height:1.2}
.logo-text b{font-size:16px;font-weight:700;color:var(--ink);letter-spacing:.2px}
.logo-text span{font-size:12px;color:var(--muted);margin-top:2px}
.nav-menu{display:flex;align-items:center;gap:4px;margin-left:8px}
.nav-menu a{
  position:relative;
  display:inline-flex;align-items:center;
  padding:8px 12px;border-radius:8px;
  font-size:14px;font-weight:500;color:var(--text);
  transition:color .18s ease-out,background .18s ease-out;
}
.nav-menu a:hover{color:var(--ink);background:var(--soft)}
.nav-menu a::after{
  content:"";position:absolute;left:12px;right:12px;bottom:2px;height:2px;
  background:var(--brand-600);border-radius:2px;opacity:0;transform:scaleX(.4);
  transition:opacity .18s ease-out,transform .18s ease-out;
}
.nav-menu a:hover::after,.nav-menu a.active::after{opacity:1;transform:scaleX(1)}
.nav-menu a.active{color:var(--brand-600);font-weight:600}
.drawer-search{display:none}
.nav-right{display:flex;align-items:center;gap:12px;margin-left:auto}
.cmd-search{
  display:flex;align-items:center;gap:10px;
  width:248px;height:40px;padding:0 12px;
  background:var(--soft);border:1px solid var(--line);border-radius:var(--r-btn);
  color:var(--muted);font-size:13px;cursor:text;
  transition:border-color .18s ease-out,background .18s ease-out,box-shadow .18s ease-out;
}
.cmd-search:hover{border-color:#CBD5E1;background:#fff}
.cmd-search:focus-visible{border-color:var(--brand-600);background:#fff;box-shadow:0 0 0 4px var(--brand-50)}
.cmd-search i{color:var(--brand-600);font-size:13px}
.cmd-search .kbd{
  margin-left:auto;font-size:11px;font-weight:600;color:var(--text);
  background:#fff;border:1px solid var(--line);border-radius:6px;padding:2px 6px;line-height:1.3;
}
.icon-btn{
  width:40px;height:40px;border-radius:var(--r-btn);
  display:inline-flex;align-items:center;justify-content:center;
  border:1px solid var(--line);background:#fff;color:var(--text);font-size:15px;
  transition:all .18s ease-out;
}
.icon-btn:hover{color:var(--brand-600);border-color:var(--brand-600);background:var(--brand-50)}
.btn-main{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 24px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;line-height:1;
  border:1px solid transparent;cursor:pointer;
  transition:transform .18s ease-out,box-shadow .18s ease-out,background .18s ease-out,color .18s ease-out,border-color .18s ease-out;
  white-space:nowrap;
}
.btn-accent{background:var(--accent);color:#fff}
.btn-accent:hover{background:#E85A28;color:#fff;transform:translateY(-1px);box-shadow:var(--sh3)}
.btn-brand{background:var(--brand-600);color:#fff}
.btn-brand:hover{background:var(--brand-700);color:#fff;transform:translateY(-1px);box-shadow:var(--sh3)}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{color:var(--brand-600);border-color:var(--brand-600);background:var(--brand-50)}
.btn-plain{background:transparent;color:var(--brand-600);border-color:transparent;padding:0 8px}
.btn-plain:hover{color:var(--brand-700)}
.btn-plain i{transition:transform .18s ease-out}
.btn-plain:hover i{transform:translateX(3px)}
.nav-cta{height:40px;padding:0 18px;font-size:14px}
.burger{
  display:none;width:40px;height:40px;border-radius:var(--r-btn);
  border:1px solid var(--line);background:#fff;color:var(--ink);font-size:16px;
  align-items:center;justify-content:center;cursor:pointer;
}
.nav-backdrop{
  position:fixed;inset:0;background:rgba(16,24,40,.45);
  opacity:0;pointer-events:none;transition:opacity .18s ease-out;z-index:1040;
}
.nav-backdrop.show{opacity:1;pointer-events:auto}
body.nav-open{overflow:hidden}

/* ---------- crumbs ---------- */
.crumbs{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);flex-wrap:wrap}
.crumbs a{color:var(--muted)}
.crumbs a:hover{color:var(--brand-600)}
.crumbs .sep{color:#D0D5DD}
.crumbs .now{color:var(--text);font-weight:500}

/* ---------- hero ---------- */
.cat-hero{
  background:linear-gradient(180deg,#FFFFFF 0%,var(--brand-50) 100%);
  padding:48px 0 72px;border-bottom:1px solid var(--line);
}
.hero-grid{display:grid;grid-template-columns:1.35fr 1fr;gap:40px;align-items:center}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;height:30px;padding:0 14px;
  border-radius:var(--r-pill);background:#fff;border:1px solid #D6E0FF;
  color:var(--brand-700);font-size:13px;font-weight:600;margin-bottom:18px;
}
.cat-hero h1{font-size:38px;line-height:1.28;margin-bottom:14px}
.cat-hero .sub{font-size:16px;line-height:1.8;color:var(--text);max-width:560px}
.hero-actions{display:flex;gap:12px;margin-top:26px;flex-wrap:wrap}
.hero-media{position:relative}
.hero-media img{width:100%;height:268px;object-fit:cover;border-radius:var(--r-lg);box-shadow:var(--sh2)}
.hero-float{
  position:absolute;left:18px;bottom:-24px;
  display:flex;align-items:center;gap:12px;
  background:#fff;border:1px solid var(--line);border-radius:14px;
  padding:12px 16px;box-shadow:var(--sh2);
}
.date-block{
  width:52px;height:52px;border-radius:12px;background:var(--brand-50);color:var(--brand-700);
  display:flex;flex-direction:column;align-items:center;justify-content:center;line-height:1.1;
}
.date-block b{font-size:19px;font-weight:700}
.date-block span{font-size:11px;color:var(--brand-600)}
.hero-float p{font-size:13px;color:var(--text);line-height:1.6}
.hero-float strong{display:block;color:var(--ink);font-size:14px}

/* ---------- stat band ---------- */
.stat-band{padding:0 0 8px;margin-top:-40px}
.stat-inner{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);
  box-shadow:var(--sh2);display:grid;grid-template-columns:repeat(4,1fr);
  overflow:hidden;
}
.stat-item{padding:24px 22px;border-right:1px solid var(--line)}
.stat-item:last-child{border-right:none}
.stat-item b{display:block;font-size:26px;color:var(--ink);font-weight:700;line-height:1.2}
.stat-item b em{font-style:normal;font-size:14px;color:var(--text);font-weight:500;margin-left:4px}
.stat-item span{display:block;font-size:13px;color:var(--muted);margin-top:6px}

/* ---------- sections ---------- */
.section{padding:88px 0}
.section.soft{background:var(--soft)}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:32px}
.sec-head h2{font-size:30px;line-height:1.35}
.sec-head p{margin-top:10px;font-size:15px;color:var(--text);max-width:680px}

/* ---------- layout 8:4 ---------- */
.layout{display:grid;grid-template-columns:minmax(0,8fr) minmax(0,4fr);gap:32px;align-items:start}
.feed{display:flex;flex-direction:column;gap:20px}
.feed-card{
  display:grid;grid-template-columns:224px minmax(0,1fr);gap:20px;
  background:#fff;border:1px solid var(--line);border-radius:var(--r-card);
  padding:16px;box-shadow:var(--sh1);
  transition:transform .18s ease-out,box-shadow .18s ease-out,border-color .18s ease-out;
}
.feed-card:hover{transform:translateY(-4px);box-shadow:var(--sh2);border-color:#D6E0FF}
.feed-thumb{position:relative;border-radius:12px;overflow:hidden;background:var(--soft)}
.feed-thumb img{width:100%;height:100%;aspect-ratio:16/10;object-fit:cover}
.feed-body{display:flex;flex-direction:column;min-width:0}
.badge-pill{
  display:inline-flex;align-items:center;height:24px;padding:0 10px;
  border-radius:var(--r-pill);background:var(--brand-50);color:var(--brand-700);
  font-size:13px;font-weight:600;line-height:1;
}
.badge-hot{background:var(--accent-50);color:#C2410C}
.feed-body h3{font-size:19px;line-height:1.5;margin:12px 0 8px}
.feed-body h3 a{color:var(--ink)}
.feed-body h3 a:hover{color:var(--brand-600)}
.feed-body p{font-size:14px;line-height:1.75;color:var(--text)}
.feed-meta{
  display:flex;align-items:center;gap:10px;flex-wrap:wrap;
  margin-top:auto;padding-top:14px;font-size:13px;color:var(--muted);
}
.feed-meta .dot{width:4px;height:4px;border-radius:50%;background:#D0D5DD}
.feed-meta a{font-weight:600;margin-left:auto;display:inline-flex;align-items:center;gap:6px}
.feed-meta a i{transition:transform .18s ease-out}
.feed-meta a:hover i{transform:translateX(3px)}
.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);background:var(--soft);border:1px solid var(--line);
  color:var(--text);font-size:13px;transition:all .18s ease-out;
}
.tag:hover{background:var(--brand-50);border-color:#D6E0FF;color:var(--brand-700)}

/* ---------- sidebar ---------- */
.side{display:flex;flex-direction:column;gap:20px}
.side-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-card);
  padding:22px;box-shadow:var(--sh1);
}
.side-card h3{font-size:16px;margin-bottom:14px;display:flex;align-items:center;gap:8px}
.side-card h3 i{color:var(--brand-600);font-size:14px}
.side-card p{font-size:14px;line-height:1.75}
.faq-mini{display:flex;flex-direction:column;gap:10px}
.faq-mini details{
  border:1px solid var(--line);border-radius:12px;background:#fff;
  padding:0;overflow:hidden;transition:border-color .18s ease-out,background .18s ease-out;
}
.faq-mini details[open]{border-color:#D6E0FF;background:#FCFDFF}
.faq-mini summary{
  list-style:none;cursor:pointer;padding:13px 16px;
  font-size:14px;font-weight:600;color:var(--ink);position:relative;
}
.faq-mini summary::-webkit-details-marker{display:none}
.faq-mini summary::before{
  content:"";position:absolute;left:0;top:10px;bottom:10px;width:3px;
  background:var(--brand-600);border-radius:0 3px 3px 0;opacity:0;transition:opacity .18s ease-out;
}
.faq-mini details[open] summary::before{opacity:1}
.faq-mini summary::after{
  content:"+";position:absolute;right:16px;top:50%;transform:translateY(-50%);
  color:var(--brand-600);font-weight:700;font-size:16px;
}
.faq-mini details[open] summary::after{content:"–"}
.faq-mini .ans{padding:0 16px 14px 16px;font-size:13.5px;line-height:1.75;color:var(--text)}
.contact-list{display:flex;flex-direction:column;gap:12px;margin-top:4px}
.contact-list li{display:flex;gap:10px;font-size:14px;color:var(--text)}
.contact-list i{color:var(--brand-600);margin-top:5px;font-size:13px}
.subscribe-box{display:flex;flex-direction:column;gap:10px;margin-top:14px}
.field{
  height:44px;border:1px solid var(--line);border-radius:var(--r-btn);
  padding:0 14px;font-size:14px;color:var(--ink);background:#fff;width:100%;
  transition:border-color .18s ease-out,box-shadow .18s ease-out;
}
.field::placeholder{color:var(--muted)}
.field:focus{outline:none;border-color:var(--brand-600);box-shadow:0 0 0 4px var(--brand-50)}
.side-note{font-size:12px;color:var(--muted);margin-top:4px}

/* ---------- explain cards ---------- */
.explain-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.explain{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-card);
  padding:24px;box-shadow:var(--sh1);position:relative;
  transition:transform .18s ease-out,box-shadow .18s ease-out,border-color .18s ease-out;
}
.explain:hover{transform:translateY(-4px);box-shadow:var(--sh2);border-color:#D6E0FF}
.explain .idx{
  font-size:13px;font-weight:700;color:var(--brand-600);letter-spacing:1px;
  display:inline-flex;align-items:center;gap:8px;
}
.explain .idx::after{content:"";width:28px;height:1px;background:#C7D4F5}
.explain h3{font-size:17px;margin:14px 0 10px}
.explain p{font-size:14px;line-height:1.78}
.explain ul{margin-top:12px;display:flex;flex-direction:column;gap:8px}
.explain li{font-size:13.5px;color:var(--text);display:flex;gap:8px}
.explain li i{color:var(--success);font-size:12px;margin-top:6px}

/* ---------- cta band ---------- */
.cta-band{background:var(--deep);padding:64px 0;color:#fff}
.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:28px;flex-wrap:wrap}
.cta-inner h2{color:#fff;font-size:26px;line-height:1.4}
.cta-inner p{color:#B6C0D9;font-size:14px;margin-top:10px;max-width:620px}
.cta-actions{display:flex;gap:12px;flex-wrap:wrap}
.cta-band .btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.34)}
.cta-band .btn-ghost:hover{background:rgba(255,255,255,.12);color:#fff;border-color:#fff}

/* ---------- footer ---------- */
.site-footer{background:var(--soft);border-top:1px solid var(--line);padding:64px 0 24px;margin-top:0}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr 1fr;gap:32px}
.foot-brand p{font-size:14px;line-height:1.8;margin-top:16px;color:var(--text)}
.foot-col h3{font-size:14px;font-weight:700;margin-bottom:14px}
.foot-col a{display:block;font-size:14px;color:var(--text);padding:5px 0}
.foot-col a:hover{color:var(--brand-600)}
.foot-col ul li{font-size:14px;color:var(--text);padding:5px 0;line-height:1.7}
.foot-bottom{
  margin-top:40px;padding-top:20px;border-top:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:var(--muted);
}
.foot-bottom .links{display:flex;gap:18px;flex-wrap:wrap}
.foot-bottom a{color:var(--muted)}
.foot-bottom a:hover{color:var(--brand-600)}

/* ---------- to top ---------- */
.to-top{
  position:fixed;right:24px;bottom:24px;width:48px;height:48px;border-radius:50%;
  background:#fff;border:1px solid var(--line);box-shadow:var(--sh2);
  display:flex;align-items:center;justify-content:center;color:var(--brand-600);font-size:16px;
  opacity:0;pointer-events:none;transform:translateY(8px);
  transition:opacity .24s ease-out,transform .24s ease-out;z-index:1020;cursor:pointer;
}
.to-top.show{opacity:1;pointer-events:auto;transform:translateY(0)}
.to-top:hover{color:var(--brand-700);border-color:var(--brand-600)}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(12px)}
.reveal.in{opacity:1;transform:none;transition:opacity .24s ease-out,transform .24s ease-out}

/* ---------- responsive ---------- */
@media (max-width:1199px){
  .layout{grid-template-columns:1fr}
  .side{position:static}
  .explain-grid{grid-template-columns:repeat(2,1fr)}
  .cmd-search{width:210px}
  .nav-menu a{padding:8px 10px;font-size:13.5px}
}
@media (max-width:991px){
  .section{padding:72px 0}
  .nav-menu{
    position:fixed;top:0;right:0;height:100%;width:min(340px,88vw);
    background:#fff;box-shadow:-8px 0 32px -12px rgba(16,24,40,.28);
    padding:88px 20px 28px;display:flex;flex-direction:column;align-items:stretch;gap:4px;
    transform:translateX(105%);transition:transform .18s ease-out;z-index:1045;margin-left:0;overflow-y:auto;
  }
  .nav-menu.open{transform:translateX(0)}
  .nav-menu a{padding:13px 12px;border-radius:10px;font-size:15px}
  .nav-menu a::after{display:none}
  .nav-menu a:hover,.nav-menu a.active{background:var(--brand-50)}
  .drawer-search{
    display:flex;align-items:center;gap:10px;height:42px;padding:0 14px;margin-bottom:12px;
    background:var(--soft);border:1px solid var(--line);border-radius:var(--r-btn);
    color:var(--muted);font-size:13.5px;
  }
  .drawer-search i{color:var(--brand-600)}
  .cmd-search,.icon-btn{display:none}
  .burger{display:inline-flex}
  .hero-grid{grid-template-columns:1fr;gap:32px}
  .cat-hero{padding:36px 0 72px}
  .cat-hero h1{font-size:30px}
  .stat-inner{grid-template-columns:repeat(2,1fr)}
  .stat-item{border-bottom:1px solid var(--line)}
  .stat-item:nth-child(2){border-right:none}
  .stat-item:nth-child(n+3){border-bottom:none}
  .foot-grid{grid-template-columns:repeat(2,1fr);gap:28px}
  .feed-card{grid-template-columns:180px minmax(0,1fr)}
}
@media (max-width:767px){
  .wrap{padding:0 16px}
  .section{padding:56px 0}
  .nav-inner{height:60px}
  .logo-text span{display:none}
  .cat-hero h1{font-size:26px;line-height:1.36}
  .hero-media img{height:200px}
  .hero-float{position:static;margin-top:16px;bottom:auto}
  .hero-actions .btn-main{width:100%}
  .sec-head{flex-direction:column;align-items:flex-start;gap:12px}
  .sec-head h2{font-size:24px}
  .feed-card{grid-template-columns:1fr;gap:14px;padding:14px}
  .feed-body h3{font-size:17px}
  .feed-meta a{margin-left:0;width:100%}
  .explain-grid{grid-template-columns:1fr}
  .cta-band{padding:48px 0}
  .cta-inner h2{font-size:22px}
  .cta-actions{width:100%}
  .cta-actions .btn-main{width:100%}
  .foot-grid{grid-template-columns:1fr;gap:24px}
  .foot-bottom{flex-direction:column;align-items:flex-start}
  .stat-inner{grid-template-columns:1fr}
  .stat-item{border-right:none;border-bottom:1px solid var(--line)}
  .stat-item:last-child{border-bottom:none}
  .to-top{right:16px;bottom:16px}
}