/* roulang page: index */
:root{
  --c-brand:#1B5CFF;
  --c-brand-600:#0F3FC9;
  --c-brand-300:#7FA6FF;
  --c-brand-tint:rgba(27,92,255,.06);
  --c-neon:#2BE8D0;
  --c-neon-2:#7C5CFF;
  --c-ink:#0B1220;
  --c-ink-2:#16203A;
  --t-900:#101828;
  --t-700:#344054;
  --t-500:#667085;
  --t-300:#98A2B3;
  --bg-page:#F4F7FC;
  --bg-card:#FFFFFF;
  --bg-soft:#EDF2FF;
  --line:#E4EAF4;
  --line-strong:#D0DAEA;
  --c-amber:#FFB020;
  --r-s:10px;
  --r-m:14px;
  --r-l:20px;
  --r-pill:999px;
  --sh-s:0 1px 2px rgba(16,24,40,.06);
  --sh-m:0 8px 24px -12px rgba(16,24,40,.18);
  --sh-l:0 24px 48px -28px rgba(13,42,90,.28);
  --sh-h:0 18px 40px -20px rgba(27,92,255,.45);
  --ease:cubic-bezier(.2,.7,.3,1);
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.85;
  color:var(--t-700);
  background:var(--bg-page);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:var(--c-brand);text-decoration:none;transition:color .2s var(--ease);}
a:hover{color:var(--c-brand-600);}
h1,h2,h3,h4,h5{color:var(--t-900);font-weight:700;margin:0;line-height:1.3;}
p{margin:0;}
ul{margin:0;padding:0;list-style:none;}
button{font-family:inherit;}
:focus-visible{outline:2px solid var(--c-neon);outline-offset:2px;border-radius:4px;}
.container,
.container-sm,
.container-md,
.container-lg,
.container-xl{
  max-width:1200px;
  padding-left:24px;
  padding-right:24px;
  margin-left:auto;
  margin-right:auto;
}
.num{font-feature-settings:"tnum";font-variant-numeric:tabular-nums;}

/* ============ 顶部导航 ============ */
.topbar{
  position:sticky;
  top:0;
  z-index:1030;
  background:var(--c-ink);
  transition:box-shadow .2s var(--ease);
}
.topbar::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  background:linear-gradient(90deg,var(--c-brand),var(--c-neon));
  box-shadow:0 0 12px rgba(43,232,208,.35);
}
.topbar.is-stuck{box-shadow:0 14px 32px -22px rgba(11,18,32,.95);}
.topbar-inner{
  display:flex;
  align-items:center;
  gap:14px;
  height:64px;
  transition:height .2s var(--ease);
}
.topbar.is-stuck .topbar-inner{height:56px;}
.brand{display:flex;align-items:center;gap:11px;flex:none;}
.logo-mark{
  width:32px;height:32px;border-radius:10px;flex:none;position:relative;
  background:linear-gradient(135deg,var(--c-brand),var(--c-neon));
  box-shadow:0 0 18px rgba(43,232,208,.32);
}
.logo-mark::before{
  content:"";position:absolute;inset:9px 8px 9px 10px;
  background:rgba(255,255,255,.94);
  border-radius:2px;
  transform:skewX(-16deg);
}
.brand-text{display:flex;flex-direction:column;line-height:1.15;}
.brand-name{color:#fff;font-size:17px;font-weight:700;letter-spacing:.2px;}
.brand-sub{color:rgba(255,255,255,.55);font-size:11px;letter-spacing:2px;}
.navcollapse{flex:1 1 auto;}
.navmenu{display:flex;align-items:center;gap:4px;flex-wrap:wrap;}
.navmenu a{
  position:relative;
  display:inline-flex;align-items:center;
  height:40px;padding:0 18px;border-radius:var(--r-pill);
  color:rgba(255,255,255,.88);
  font-size:15px;
  white-space:nowrap;
  transition:background .2s var(--ease),color .2s var(--ease),box-shadow .2s var(--ease);
}
.navmenu a::after{
  content:"";position:absolute;left:50%;bottom:5px;transform:translateX(-50%);
  width:0;height:2px;border-radius:2px;background:var(--c-neon);
  transition:width .2s var(--ease);
}
.navmenu a:hover{color:#fff;background:rgba(255,255,255,.06);}
.navmenu a:hover::after{width:18px;}
.navmenu a.active{
  color:var(--c-neon);
  background:rgba(43,232,208,.10);
  box-shadow:inset 0 0 0 1px rgba(43,232,208,.45),0 0 18px rgba(43,232,208,.30);
}
.navmenu a.active::after{width:0;}
.topbar-cta{
  display:inline-flex;align-items:center;justify-content:center;
  height:40px;padding:0 22px;border-radius:var(--r-pill);
  background:var(--c-neon);color:var(--c-ink);
  font-size:14px;font-weight:700;white-space:nowrap;flex:none;
  transition:transform .2s var(--ease),box-shadow .2s var(--ease),background .2s var(--ease);
}
.topbar-cta:hover{background:#49f2dc;color:var(--c-ink);transform:translateY(-1px);box-shadow:0 10px 26px -10px rgba(43,232,208,.75);}
.navtoggle{
  width:42px;height:42px;border:0;background:transparent;flex:none;margin-left:auto;
  display:inline-flex;flex-direction:column;justify-content:center;align-items:center;gap:5px;
  border-radius:10px;
}
.navtoggle span{display:block;width:22px;height:2px;border-radius:2px;background:#fff;transition:transform .25s var(--ease),opacity .25s var(--ease);}
.navtoggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.navtoggle[aria-expanded="true"] span:nth-child(2){opacity:0;}
.navtoggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

@media (min-width:992px){
  .navcollapse{display:flex !important;align-items:center;justify-content:space-between;height:auto !important;visibility:visible !important;}
  .navmenu{flex-wrap:nowrap;}
  .navtoggle{display:none;}
}
@media (max-width:991.98px){
  .topbar-inner{height:56px;}
  .brand-name{font-size:15.5px;}
  .navcollapse{
    background:var(--c-ink-2);
    border-radius:var(--r-m);
    margin-bottom:14px;
    padding:10px;
    box-shadow:0 24px 48px -28px rgba(0,0,0,.8);
  }
  .navmenu{flex-direction:column;align-items:stretch;gap:2px;}
  .navmenu a{
    height:48px;border-radius:var(--r-s);
    border-left:3px solid transparent;
    justify-content:flex-start;
  }
  .navmenu a::after{display:none;}
  .navmenu a.active{
    border-left-color:var(--c-neon);
    box-shadow:none;
    background:rgba(43,232,208,.10);
  }
  .topbar-cta{width:100%;margin-top:8px;height:46px;}
}

/* ============ 按钮 / 文字链 / 徽章 ============ */
.btn-brand,.btn-ghost,.btn-neon-outline{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 26px;border-radius:var(--r-pill);
  font-size:15px;font-weight:600;border:1px solid transparent;
  transition:transform .2s var(--ease),box-shadow .2s var(--ease),background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
  cursor:pointer;
}
.btn-brand{background:var(--c-brand);color:#fff;box-shadow:0 10px 26px -16px rgba(27,92,255,.9);}
.btn-brand:hover{background:var(--c-brand-600);color:#fff;transform:translateY(-1px);box-shadow:var(--sh-h);}
.btn-brand:active{transform:translateY(0);box-shadow:inset 0 2px 6px rgba(0,0,0,.18);}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--t-700);}
.btn-ghost:hover{border-color:var(--c-brand);color:var(--c-brand);background:var(--c-brand-tint);transform:translateY(-1px);}
.btn-neon-outline{background:transparent;border-color:rgba(255,255,255,.32);color:#fff;}
.btn-neon-outline:hover{border-color:var(--c-neon);color:var(--c-neon);background:rgba(43,232,208,.08);}
.link-arrow{
  display:inline-flex;align-items:center;gap:6px;
  font-size:15px;font-weight:600;color:var(--c-brand);
}
.link-arrow span{transition:transform .2s var(--ease);}
.link-arrow:hover span{transform:translateX(3px);}
.badge-pill{
  display:inline-flex;align-items:center;gap:7px;
  padding:6px 15px;border-radius:var(--r-pill);
  border:1px solid rgba(27,92,255,.32);
  background:rgba(27,92,255,.06);
  color:var(--c-brand);font-size:13px;font-weight:600;letter-spacing:.3px;
}
.tag-soft{
  display:inline-flex;align-items:center;
  padding:4px 12px;border-radius:var(--r-pill);
  background:var(--bg-soft);color:var(--c-brand);
  font-size:12px;font-weight:600;letter-spacing:.3px;
}
.tag-time{
  display:inline-flex;align-items:center;
  padding:4px 12px;border-radius:var(--r-pill);
  background:#F1F4F9;color:var(--t-500);
  font-size:12px;letter-spacing:.3px;
}
.hairline{
  display:block;width:40px;height:12px;border-radius:3px;
  background:linear-gradient(90deg,var(--c-brand),var(--c-neon));
  margin-bottom:16px;
}

/* ============ 区块 ============ */
.section{padding:96px 0;}
.section-soft{background:var(--bg-soft);}
.section-white{background:#fff;}
.section-head{
  display:flex;align-items:flex-end;justify-content:space-between;gap:24px;
  margin-bottom:48px;flex-wrap:wrap;
}
.section-head h2{font-size:clamp(24px,2.6vw,34px);line-height:1.25;letter-spacing:-.3px;}
.section-head p{margin-top:12px;color:var(--t-500);font-size:15px;max-width:620px;}
@media (max-width:991.98px){.section{padding:72px 0;}.section-head{margin-bottom:36px;}}
@media (max-width:767.98px){.section{padding:56px 0;}.section-head{margin-bottom:28px;}}
@media (max-width:575.98px){.section{padding:44px 0;}}

/* ============ Hero ============ */
.hero{
  position:relative;
  padding:88px 0 80px;
  background:var(--bg-page);
  overflow:hidden;
}
.hero::before{
  content:"";position:absolute;right:-180px;top:-220px;width:640px;height:640px;
  border-radius:50%;
  background:radial-gradient(circle,rgba(27,92,255,.10),rgba(27,92,255,0) 68%);
  pointer-events:none;
}
.hero::after{
  content:"";position:absolute;left:-140px;bottom:-200px;width:480px;height:480px;
  border-radius:50%;
  background:radial-gradient(circle,rgba(43,232,208,.12),rgba(43,232,208,0) 70%);
  pointer-events:none;
}
.hero .container{position:relative;z-index:2;}
.hero h1{
  font-size:clamp(34px,5vw,54px);
  line-height:1.12;
  letter-spacing:-.5px;
  margin:22px 0 20px;
}
.hero-sub{
  font-size:17px;
  line-height:1.8;
  color:var(--t-700);
  max-width:560px;
}
.hero-cta{display:flex;align-items:center;gap:22px;flex-wrap:wrap;margin-top:34px;}
.hero-stats{display:flex;align-items:stretch;gap:26px;margin-top:46px;flex-wrap:wrap;}
.hero-stats .stat{padding-right:26px;border-right:1px solid var(--line-strong);}
.hero-stats .stat:last-child{border-right:0;padding-right:0;}
.stat-num{
  display:block;color:var(--c-brand);
  font-size:26px;font-weight:700;line-height:1.2;
  font-feature-settings:"tnum";
}
.stat-label{display:block;color:var(--t-500);font-size:12px;letter-spacing:.6px;margin-top:4px;}
.hero-visual{
  position:relative;
  border-radius:var(--r-l);
  overflow:hidden;
  box-shadow:var(--sh-l);
  outline:1px solid var(--line);
  outline-offset:-1px;
  background:var(--bg-soft);
}
.hero-visual img{width:100%;aspect-ratio:16/11;object-fit:cover;}
.hero-visual-tag{
  position:absolute;left:16px;top:16px;
  padding:6px 14px;border-radius:var(--r-pill);
  background:rgba(11,18,32,.82);
  color:var(--c-neon);
  font-size:12px;font-weight:600;letter-spacing:.6px;
  backdrop-filter:blur(4px);
}
.hero-mini{
  position:absolute;right:16px;bottom:16px;
  width:124px;border-radius:var(--r-m);overflow:hidden;
  border:3px solid #fff;
  box-shadow:var(--sh-m);
}
.hero-mini img{width:100%;aspect-ratio:4/3;object-fit:cover;}
@media (max-width:991.98px){
  .hero{padding:56px 0 60px;}
  .hero-visual{margin-top:36px;}
  .hero-visual img{aspect-ratio:16/10;}
  .hero-stats{gap:0;}
  .hero-stats .stat{flex:1 1 0;padding:0 10px;border-right:1px solid var(--line-strong);text-align:center;}
}
@media (max-width:575.98px){
  .hero{padding:40px 0 48px;}
  .hero-cta{gap:12px;}
  .hero-cta .btn-brand{width:100%;}
  .stat-num{font-size:21px;}
  .hero-mini{width:96px;}
}

/* ============ 三步上手 ============ */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:0;position:relative;}
.step{
  position:relative;
  padding:30px 28px 26px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--r-l);
  box-shadow:var(--sh-s);
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
}
.step + .step{margin-left:26px;}
.step + .step::before{
  content:"";position:absolute;left:-27px;top:52px;
  width:26px;border-top:1px dashed var(--line-strong);
}
.step + .step::after{
  content:"";position:absolute;left:-18px;top:48px;
  width:8px;height:8px;border-radius:50%;
  background:var(--c-neon);
  box-shadow:0 0 12px rgba(43,232,208,.85);
}
.step:hover{transform:translateY(-4px);box-shadow:var(--sh-h);border-color:rgba(27,92,255,.35);}
.step-num{
  width:44px;height:44px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  background:#fff;
  border:2px solid transparent;
  background-image:linear-gradient(#fff,#fff),linear-gradient(135deg,var(--c-brand),var(--c-neon));
  background-origin:border-box;
  background-clip:padding-box,border-box;
  color:var(--c-brand);font-size:17px;font-weight:700;
  font-feature-settings:"tnum";
}
.step h3{font-size:18px;margin:20px 0 10px;}
.step p{font-size:14.5px;color:var(--t-500);line-height:1.8;}
@media (max-width:767.98px){
  .steps{grid-template-columns:1fr;gap:18px;}
  .step{padding:22px 20px;}
  .step + .step{margin-left:0;}
  .step + .step::before{left:24px;top:-18px;width:0;height:18px;border-top:0;border-left:2px solid var(--line-strong);}
  .step + .step::after{left:20px;top:0;}
}

/* ============ 能力网格 ============ */
.cap-card{
  height:100%;
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--r-l);
  padding:28px;
  box-shadow:var(--sh-s);
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
}
.cap-card:hover{transform:translateY(-4px);box-shadow:var(--sh-h);border-color:rgba(27,92,255,.35);}
.cap-ico{
  width:46px;height:46px;border-radius:var(--r-m);
  display:flex;align-items:center;justify-content:center;
  background:var(--bg-soft);color:var(--c-brand);
  margin-bottom:18px;
}
.cap-card h3{font-size:18px;margin-bottom:10px;}
.cap-card p{font-size:14.5px;color:var(--t-500);line-height:1.8;}
@media (max-width:767.98px){.cap-card{padding:20px;}}

/* ============ 案例证明 ============ */
.proof-main{
  height:100%;
  display:flex;
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--r-l);
  overflow:hidden;
  box-shadow:var(--sh-m);
  transition:transform .22s var(--ease),box-shadow .22s var(--ease);
}
.proof-main:hover{transform:translateY(-3px);box-shadow:var(--sh-h);}
.proof-main .proof-img{flex:0 0 46%;background:var(--bg-soft);}
.proof-main .proof-img img{width:100%;height:100%;object-fit:cover;aspect-ratio:16/10;}
.proof-main .proof-body{padding:28px;display:flex;flex-direction:column;gap:12px;justify-content:center;}
.proof-main h3{font-size:19px;line-height:1.45;}
.proof-main p{font-size:14.5px;color:var(--t-500);}
.proof-stat{
  height:100%;
  background:var(--bg-soft);
  border-left:4px solid var(--c-brand);
  border-radius:var(--r-l);
  padding:28px;
  display:flex;
  flex-direction:column;
  justify-content:center;
  gap:14px;
}
.proof-stat .big{font-size:38px;font-weight:700;color:var(--c-brand);line-height:1;font-feature-settings:"tnum";}
.proof-stat p{font-size:14.5px;color:var(--t-700);}
.proof-stat .mini-row{display:flex;gap:10px;flex-wrap:wrap;}
.proof-mini{
  height:100%;
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--r-l);
  overflow:hidden;
  box-shadow:var(--sh-s);
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
}
.proof-mini:hover{transform:translateY(-3px);box-shadow:var(--sh-h);border-color:rgba(27,92,255,.35);}
.proof-mini img{width:100%;aspect-ratio:16/10;object-fit:cover;background:var(--bg-soft);}
.proof-mini .pm-body{padding:16px 18px 18px;}
.proof-mini h4{font-size:15.5px;font-weight:600;color:var(--t-900);line-height:1.5;}
.proof-mini span{display:block;font-size:12.5px;color:var(--t-300);margin-top:8px;letter-spacing:.3px;}
@media (max-width:767.98px){
  .proof-main{flex-direction:column;}
  .proof-main .proof-img{flex:none;}
  .proof-main .proof-img img{aspect-ratio:16/9;}
}

/* ============ 内容列表 ============ */
.post-card{
  height:100%;
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--r-l);
  overflow:hidden;
  box-shadow:var(--sh-s);
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
  display:flex;flex-direction:column;
}
.post-card:hover{transform:translateY(-4px);box-shadow:var(--sh-h);border-color:rgba(27,92,255,.35);}
.post-thumb{position:relative;overflow:hidden;background:var(--bg-soft);}
.post-thumb img{width:100%;aspect-ratio:16/10;object-fit:cover;transition:transform .35s var(--ease);}
.post-card:hover .post-thumb img{transform:scale(1.04);}
.post-tag{
  position:absolute;left:14px;top:14px;
  padding:5px 13px;border-radius:var(--r-pill);
  background:rgba(11,18,32,.86);color:#fff;
  font-size:12px;font-weight:600;letter-spacing:.3px;
  max-width:70%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}
.post-body{padding:20px 22px 22px;display:flex;flex-direction:column;flex:1 1 auto;}
.post-title{font-size:17px;line-height:1.5;font-weight:600;}
.post-title a{color:var(--t-900);}
.post-title a:hover{color:var(--c-brand);}
.post-sum{
  margin-top:10px;font-size:14px;color:var(--t-500);line-height:1.8;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.post-meta{
  margin-top:16px;padding-top:14px;border-top:1px solid var(--line);
  display:flex;align-items:center;gap:10px;flex-wrap:wrap;
  font-size:12.5px;color:var(--t-300);
}
.post-meta .dot{width:4px;height:4px;border-radius:50%;background:var(--line-strong);}
.post-meta a{font-weight:600;font-size:13px;}
.empty-state{
  min-height:220px;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;
  background:var(--bg-soft);
  border:1px dashed var(--line-strong);
  border-radius:var(--r-l);
  padding:40px 24px;
  text-align:center;
}
.empty-state svg{stroke:var(--c-brand-300);}
.empty-state p{font-size:15px;color:var(--t-500);}

/* ============ FAQ ============ */
.faq .accordion-item{
  position:relative;
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--r-m);
  margin-bottom:12px;
  overflow:hidden;
  box-shadow:var(--sh-s);
  transition:border-color .22s var(--ease),box-shadow .22s var(--ease);
}
.faq .accordion-item:hover{border-color:rgba(27,92,255,.35);}
.faq .accordion-item::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:3px;
  background:var(--c-neon);opacity:0;transition:opacity .25s var(--ease);
}
.faq .accordion-item:has(.accordion-button:not(.collapsed))::before{opacity:1;}
.faq .accordion-button{
  background:#fff;
  color:var(--t-900);
  font-size:16px;font-weight:600;
  padding:20px 24px;
  box-shadow:none;
  border-radius:var(--r-m);
  line-height:1.6;
}
.faq .accordion-button:not(.collapsed){
  color:var(--c-brand);
  background:rgba(27,92,255,.04);
  box-shadow:none;
}
.faq .accordion-button:focus{box-shadow:none;outline:2px solid var(--c-neon);outline-offset:-2px;}
.faq .accordion-button::after{
  width:17px;height:17px;background-size:17px 17px;flex:none;margin-left:16px;
  background-image:url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23667085' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  transition:transform .3s var(--ease);
}
.faq .accordion-button:not(.collapsed)::after{
  background-image:url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231B5CFF' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  transform:rotate(180deg);
}
.faq .accordion-body{
  padding:0 24px 22px 24px;
  font-size:15px;color:var(--t-500);line-height:1.85;
}
@media (max-width:767.98px){
  .faq .accordion-button{padding:16px 18px;font-size:15.5px;}
  .faq .accordion-body{padding:0 18px 18px 18px;}
}

/* ============ CTA ============ */
.cta-band{
  position:relative;
  border-radius:var(--r-l);
  padding:52px 48px;
  background:linear-gradient(135deg,var(--c-ink),var(--c-ink-2));
  overflow:hidden;
  display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;
}
.cta-band::before{
  content:"";position:absolute;right:-90px;top:-110px;width:340px;height:340px;border-radius:50%;
  background:radial-gradient(circle,rgba(43,232,208,.22),rgba(43,232,208,0) 70%);
}
.cta-band > *{position:relative;z-index:2;}
.cta-band h2{color:#fff;font-size:clamp(22px,2.5vw,30px);line-height:1.35;}
.cta-band p{color:rgba(255,255,255,.72);font-size:15px;margin-top:12px;max-width:560px;}
.cta-actions{display:flex;gap:14px;flex-wrap:wrap;}
@media (max-width:767.98px){
  .cta-band{padding:32px 22px;}
  .cta-actions{width:100%;}
  .cta-actions .btn-brand,.cta-actions .btn-neon-outline{flex:1 1 100%;}
}

/* ============ 页脚 ============ */
.site-footer{
  background:var(--c-ink);
  color:rgba(255,255,255,.68);
  padding:72px 0 0;
  margin-top:0;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1fr;
  gap:40px;
  padding-bottom:56px;
}
.site-footer h4{
  color:var(--c-neon);
  font-size:13px;letter-spacing:1.5px;font-weight:700;
  margin-bottom:20px;
}
.site-footer ul li{margin-bottom:12px;}
.site-footer a{color:rgba(255,255,255,.68);font-size:14px;transition:color .2s var(--ease),transform .2s var(--ease);display:inline-block;}
.site-footer a:hover{color:#fff;transform:translateX(2px);}
.footer-brand{display:flex;align-items:center;gap:11px;margin-bottom:16px;}
.footer-brand .brand-name{color:#fff;font-size:17px;font-weight:700;}
.footer-desc{font-size:14px;line-height:1.85;color:rgba(255,255,255,.6);max-width:300px;}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.08);
  padding:24px 0 32px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:rgba(255,255,255,.5);
}
.footer-bottom a{font-size:13px;color:rgba(255,255,255,.6);}
@media (max-width:991.98px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
}
@media (max-width:575.98px){
  .site-footer{padding-top:48px;}
  .footer-grid{grid-template-columns:1fr;gap:32px;padding-bottom:36px;}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{transition:none !important;animation:none !important;}
  .step:hover,.cap-card:hover,.post-card:hover,.proof-mini:hover,.proof-main:hover,.btn-brand:hover,.btn-ghost:hover{transform:none !important;}
}

/* roulang page: article */
:root{
  --c-brand:#1B5CFF;
  --c-brand-600:#0F3FC9;
  --c-brand-300:#7FA6FF;
  --c-brand-tint:rgba(27,92,255,.06);
  --c-neon:#2BE8D0;
  --c-neon-2:#7C5CFF;
  --c-ink:#0B1220;
  --c-ink-2:#16203A;
  --t-900:#101828;
  --t-700:#344054;
  --t-500:#667085;
  --t-300:#98A2B3;
  --bg-page:#F4F7FC;
  --bg-card:#FFFFFF;
  --bg-soft:#EDF2FF;
  --line:#E4EAF4;
  --line-strong:#D0DAEA;
  --c-amber:#FFB020;
  --r-s:10px;
  --r-m:14px;
  --r-l:20px;
  --r-pill:999px;
  --sh-s:0 1px 2px rgba(16,24,40,.06);
  --sh-m:0 8px 24px -12px rgba(16,24,40,.18);
  --sh-l:0 24px 48px -28px rgba(13,42,90,.28);
  --sh-h:0 18px 40px -20px rgba(27,92,255,.45);
  --ease:cubic-bezier(.2,.7,.3,1);
}
*{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Helvetica Neue",Arial,sans-serif;
  font-size:16px;
  line-height:1.85;
  color:var(--t-700);
  background:var(--bg-page);
  -webkit-font-smoothing:antialiased;
  font-feature-settings:"tnum";
}
img{max-width:100%;display:block;border:0;}
a{color:var(--c-brand);text-decoration:none;transition:color .2s var(--ease),opacity .2s var(--ease);}
a:hover{color:var(--c-brand-600);}
h1,h2,h3,h4,h5{margin:0;color:var(--t-900);font-weight:700;letter-spacing:-.2px;}
p{margin:0 0 1.1em;}
ul,ol{margin:0;}
button{font-family:inherit;}
:focus-visible{outline:2px solid var(--c-neon);outline-offset:2px;border-radius:6px;}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px;}
.section{padding:72px 0;}
.section-head{margin-bottom:32px;}
.section-head h2{
  font-size:clamp(24px,2.6vw,34px);
  line-height:1.25;
  position:relative;
  padding-top:18px;
}
.section-head h2::before{
  content:"";
  position:absolute;
  top:0;left:0;
  width:40px;height:12px;
  border-radius:3px;
  background:linear-gradient(90deg,var(--c-brand),var(--c-neon));
  box-shadow:0 0 14px rgba(43,232,208,.35);
}
.section-head p{margin:10px 0 0;color:var(--t-500);font-size:15px;}

/* ---------- 顶栏 ---------- */
.topbar{
  position:sticky;top:0;z-index:1030;
  background:var(--c-ink);
  transition:box-shadow .2s var(--ease);
}
.topbar::after{
  content:"";display:block;height:2px;
  background:linear-gradient(90deg,var(--c-brand),var(--c-neon));
  box-shadow:0 0 14px rgba(43,232,208,.5);
}
.topbar.is-stuck{box-shadow:0 14px 34px -22px rgba(0,0,0,.85);}
.topbar-inner{
  display:flex;align-items:center;justify-content:space-between;
  gap:18px;min-height:64px;
  transition:min-height .2s var(--ease);
}
.topbar.is-stuck .topbar-inner{min-height:56px;}
.brand{display:flex;align-items:center;gap:11px;color:#fff;flex:0 0 auto;}
.brand:hover{color:#fff;}
.logo-mark{
  position:relative;display:inline-block;width:32px;height:32px;flex:0 0 auto;
  border-radius:9px;
  background:linear-gradient(135deg,var(--c-brand),var(--c-neon));
  box-shadow:0 0 16px rgba(43,232,208,.4);
}
.logo-mark::after{
  content:"";position:absolute;inset:8px;
  background:var(--c-ink);
  border-radius:3px;
  transform:skewX(-14deg);
}
.brand-text{display:flex;flex-direction:column;line-height:1.2;}
.brand-name{font-size:17px;font-weight:700;color:#fff;letter-spacing:.2px;}
.brand-sub{font-size:10px;letter-spacing:2px;color:rgba(255,255,255,.55);}
.navcollapse{display:flex;align-items:center;gap:14px;flex:1 1 auto;justify-content:flex-end;}
.navmenu{display:flex;align-items:center;gap:4px;}
.navmenu a{
  position:relative;
  display:inline-flex;align-items:center;height:40px;padding:0 18px;
  border-radius:var(--r-pill);
  border:1px solid transparent;
  color:rgba(255,255,255,.88);
  font-size:15px;white-space:nowrap;
  transition:all .2s var(--ease);
}
.navmenu a::after{
  content:"";position:absolute;left:50%;bottom:2px;
  width:0;height:2px;border-radius:2px;
  background:var(--c-neon);
  transform:translateX(-50%);
  transition:width .22s var(--ease);
}
.navmenu a:hover{color:#fff;background:rgba(255,255,255,.06);}
.navmenu a:hover::after{width:18px;}
.navmenu a.active{
  color:var(--c-neon);
  background:rgba(43,232,208,.10);
  border-color:rgba(43,232,208,.45);
  box-shadow:0 0 18px rgba(43,232,208,.3);
}
.navmenu a.active::after{display:none;}
.topbar-cta{
  display:inline-flex;align-items:center;justify-content:center;
  height:40px;padding:0 20px;flex:0 0 auto;
  border-radius:var(--r-pill);
  background:var(--c-neon);color:var(--c-ink);
  font-size:14px;font-weight:600;
  transition:transform .2s var(--ease),box-shadow .2s var(--ease),background .2s var(--ease);
}
.topbar-cta:hover{
  background:#4ff2dd;color:var(--c-ink);
  transform:translateY(-1px);
  box-shadow:0 12px 26px -12px rgba(43,232,208,.85);
}
.navtoggle{
  display:none;flex-direction:column;justify-content:center;gap:5px;
  width:42px;height:42px;padding:0 9px;
  background:transparent;border:0;cursor:pointer;flex:0 0 auto;
}
.navtoggle span{display:block;height:2px;border-radius:2px;background:#fff;transition:transform .25s var(--ease),opacity .25s var(--ease);}
.navtoggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.navtoggle[aria-expanded="true"] span:nth-child(2){opacity:0;}
.navtoggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

/* ---------- 阅读进度 ---------- */
.read-progress{
  position:fixed;top:0;left:0;height:2px;width:0;z-index:1050;
  background:var(--c-neon);
  box-shadow:0 0 12px rgba(43,232,208,.85);
  transition:width .1s linear;
}

/* ---------- 页头 ---------- */
.page-head{
  position:relative;
  padding:48px 0 44px;
  background:var(--bg-soft);
  border-bottom:1px solid var(--line);
  overflow:hidden;
}
.page-head-bg{
  position:absolute;inset:0;
  background-image:url('/assets/images/backpic/back-2.webp');
  background-size:cover;background-position:center;
  opacity:.16;
}
.page-head::after{
  content:"";position:absolute;inset:0;
  background:radial-gradient(680px 260px at 82% 12%,rgba(27,92,255,.14),transparent 70%);
}
.page-head .container{position:relative;z-index:2;}
.crumb{margin-bottom:20px;}
.crumb ol{
  display:flex;flex-wrap:wrap;align-items:center;
  gap:8px;list-style:none;padding:0;margin:0;
  font-size:13px;color:var(--t-300);
}
.crumb li{display:inline-flex;align-items:center;gap:8px;}
.crumb li+li::before{content:"/";color:var(--line-strong);}
.crumb a{color:var(--t-300);}
.crumb a:hover{color:var(--c-brand);}
.crumb .current{color:var(--t-500);max-width:340px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.article-head{max-width:880px;}
.cat-pill{
  display:inline-flex;align-items:center;
  height:26px;padding:0 12px;margin-bottom:16px;
  border-radius:var(--r-pill);
  background:var(--c-ink);color:#fff;
  font-size:12px;letter-spacing:.4px;
}
.article-head h1{
  font-size:clamp(26px,3.4vw,38px);
  line-height:1.3;
  letter-spacing:-.4px;
  margin-bottom:18px;
}
.meta-row{
  display:flex;flex-wrap:wrap;align-items:center;gap:12px;
  font-size:13px;color:var(--t-500);
}
.meta-row .dot{width:1px;height:12px;background:var(--line-strong);display:inline-block;}
.meta-row .time{color:var(--c-amber);font-weight:600;}

/* ---------- 正文 ---------- */
.article-card{
  max-width:800px;
  margin:44px auto 0;
  background:var(--bg-card);
  border:1px solid var(--line);
  border-radius:var(--r-l);
  box-shadow:var(--sh-s);
  padding:40px;
}
.article-body{font-size:16px;line-height:1.9;color:var(--t-700);}
.article-body>*:first-child{margin-top:0;}
.article-body p{margin:0 0 1.25em;}
.article-body h2{
  font-size:22px;font-weight:700;line-height:1.45;
  margin:32px 0 14px;
  padding-left:12px;
  border-left:4px solid var(--c-brand);
}
.article-body h3{font-size:18px;font-weight:600;margin:24px 0 10px;color:var(--t-900);}
.article-body h4{font-size:16px;font-weight:600;margin:20px 0 8px;}
.article-body img{width:100%;height:auto;border-radius:var(--r-m);margin:10px 0 8px;background:var(--bg-soft);}
.article-body figure{margin:18px 0;}
.article-body figcaption{font-size:13px;color:var(--t-300);text-align:center;margin-top:6px;}
.article-body blockquote{
  margin:20px 0;padding:14px 18px;
  background:var(--bg-soft);
  border-left:3px solid var(--c-neon);
  border-radius:0 var(--r-m) var(--r-m) 0;
  font-size:15px;color:var(--t-700);
}
.article-body ul,.article-body ol{padding-left:22px;margin:0 0 1.25em;}
.article-body li{margin-bottom:8px;}
.article-body ul li::marker,.article-body ol li::marker{color:var(--c-brand);font-weight:700;}
.article-body a{color:var(--c-brand);text-decoration:underline;text-underline-offset:3px;}
.article-body a:hover{color:var(--c-brand-600);}
.article-body table{width:100%;border-collapse:collapse;font-size:14px;margin:18px 0;border:0;}
.article-body th{background:var(--bg-soft);text-align:left;font-weight:600;color:var(--t-900);}
.article-body th,.article-body td{padding:10px 12px;border-bottom:1px solid var(--line);}
.article-body hr{border:0;border-top:1px solid var(--line);margin:28px 0;}
.article-note{
  max-width:800px;margin:16px auto 0;
  display:flex;gap:10px;align-items:flex-start;
  padding:14px 18px;
  background:var(--bg-soft);
  border-radius:var(--r-m);
  font-size:14px;color:var(--t-500);line-height:1.75;
}
.article-note strong{color:var(--t-900);font-weight:600;}
.empty-note{
  max-width:800px;margin:44px auto 0;
  padding:56px 24px;text-align:center;
  background:var(--bg-soft);
  border:1px dashed var(--line-strong);
  border-radius:var(--r-l);
}
.empty-note svg{margin:0 auto 14px;display:block;stroke:var(--c-brand-300);}
.empty-note p{font-size:15px;color:var(--t-500);margin-bottom:20px;}

/* ---------- 按钮 ---------- */
.btn-primary{
  display:inline-flex;align-items:center;justify-content:center;
  height:44px;padding:0 26px;
  border:0;border-radius:var(--r-pill);
  background:var(--c-brand);color:#fff;
  font-size:15px;font-weight:600;cursor:pointer;
  transition:transform .2s var(--ease),box-shadow .2s var(--ease),background .2s var(--ease);
}
.btn-primary:hover{background:var(--c-brand-600);color:#fff;transform:translateY(-1px);box-shadow:var(--sh-h);}
.btn-primary:active{transform:translateY(0);box-shadow:inset 0 2px 6px rgba(0,0,0,.18);}
.btn-outline{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 24px;
  border:1px solid var(--line);border-radius:var(--r-pill);
  background:#fff;color:var(--t-700);
  font-size:15px;font-weight:600;cursor:pointer;
  transition:all .2s var(--ease);
}
.btn-outline:hover{border-color:var(--c-brand);color:var(--c-brand);background:var(--c-brand-tint);}
.btn-ghost{
  display:inline-flex;align-items:center;justify-content:center;
  height:44px;padding:0 24px;
  border:1px solid rgba(255,255,255,.3);border-radius:var(--r-pill);
  background:transparent;color:#fff;
  font-size:15px;font-weight:600;
  transition:all .2s var(--ease);
}
.btn-ghost:hover{border-color:#fff;color:#fff;background:rgba(255,255,255,.08);}
.link-more{
  display:inline-flex;align-items:center;gap:6px;
  font-size:14px;font-weight:600;color:var(--c-brand);
}
.link-more svg{transition:transform .2s var(--ease);}
.link-more:hover svg{transform:translateX(3px);}

/* ---------- 相关阅读 ---------- */
.related-section{max-width:800px;margin:0 auto;}
.related-list{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-l);
  box-shadow:var(--sh-s);overflow:hidden;
}
.related-item{
  display:flex;align-items:center;gap:16px;
  padding:14px 18px;
  border-bottom:1px solid var(--line);
  transition:background .2s var(--ease);
}
.related-item:last-child{border-bottom:0;}
.related-item:hover{background:var(--c-brand-tint);}
.related-item img{
  width:96px;height:64px;flex:0 0 auto;
  object-fit:cover;border-radius:var(--r-s);
  background:var(--bg-soft);
}
.related-item .ri-title{font-size:15px;font-weight:600;color:var(--t-900);line-height:1.5;}
.related-item .ri-title:hover{color:var(--c-brand);}
.related-item .ri-time{font-size:12px;color:var(--t-300);margin-top:4px;}
.related-foot{margin-top:24px;}

/* ---------- CTA ---------- */
.cta-band{
  display:flex;align-items:center;justify-content:space-between;
  gap:28px;flex-wrap:wrap;
  padding:44px 40px;
  border-radius:var(--r-l);
  background:linear-gradient(120deg,var(--c-ink) 0%,var(--c-ink-2) 100%);
  box-shadow:var(--sh-l);
}
.cta-band h2{color:#fff;font-size:clamp(22px,2.4vw,28px);line-height:1.35;margin-bottom:8px;}
.cta-band p{color:rgba(255,255,255,.72);font-size:15px;margin:0;}
.cta-actions{display:flex;gap:14px;flex-wrap:wrap;}

/* ---------- 页脚 ---------- */
.site-footer{
  margin-top:96px;padding:64px 0 0;
  background:var(--c-ink);
  color:rgba(255,255,255,.68);
  font-size:14px;
}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px;}
.footer-brand{display:flex;align-items:center;gap:11px;margin-bottom:16px;}
.footer-brand .brand-name{color:#fff;font-size:16px;font-weight:700;}
.footer-desc{color:rgba(255,255,255,.62);font-size:14px;line-height:1.8;max-width:300px;margin:0;}
.site-footer h4{
  color:var(--c-neon);font-size:13px;font-weight:600;
  letter-spacing:1.5px;margin-bottom:16px;
}
.site-footer ul{list-style:none;padding:0;margin:0;display:grid;gap:10px;}
.site-footer ul a{display:inline-block;color:rgba(255,255,255,.68);font-size:14px;transition:color .2s var(--ease),transform .2s var(--ease);}
.site-footer ul a:hover{color:#fff;transform:translateX(2px);}
.footer-bottom{
  margin-top:52px;padding:20px 0;
  border-top:1px solid rgba(255,255,255,.08);
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;
  font-size:13px;color:rgba(255,255,255,.5);
}

/* ---------- 响应式 ---------- */
@media (max-width:1199.98px){
  .navmenu a{padding:0 14px;font-size:14px;}
}
@media (max-width:991.98px){
  .section{padding:56px 0;}
  .navtoggle{display:flex;}
  .navcollapse.collapse{display:none;}
  .navcollapse{
    flex-direction:column;align-items:stretch;
    gap:0;
    background:var(--c-ink-2);
    border-radius:var(--r-m);
    padding:12px;
    margin:0 0 14px;
    justify-content:flex-start;
  }
  .navcollapse.collapse.show{display:flex;}
  .navmenu{flex-direction:column;align-items:stretch;gap:2px;width:100%;}
  .navmenu a{
    height:48px;border-radius:10px;
    border-left:3px solid rgba(43,232,208,.5);
    padding-left:16px;
  }
  .navmenu a::after{display:none;}
  .topbar-cta{width:100%;margin-top:10px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .article-card{max-width:100%;padding:28px;}
  .page-head{padding:36px 0 34px;}
  .cta-band{padding:34px 26px;}
}
@media (min-width:992px){
  .navcollapse.collapse{display:flex !important;}
}
@media (max-width:767.98px){
  body{font-size:15px;line-height:1.8;}
  .container{padding:0 16px;}
  .section{padding:44px 0;}
  .page-head{padding:28px 0 26px;}
  .article-card{padding:20px;border-radius:var(--r-m);margin-top:32px;}
  .article-body{font-size:15px;line-height:1.85;}
  .article-body h2{font-size:19px;margin-top:26px;}
  .article-body h3{font-size:17px;}
  .related-item{padding:12px;gap:12px;}
  .related-item img{width:76px;height:54px;}
  .cta-band{padding:28px 20px;border-radius:var(--r-m);}
  .cta-actions{width:100%;}
  .cta-actions .btn-primary,.cta-actions .btn-ghost{flex:1 1 auto;}
  .footer-grid{grid-template-columns:1fr;gap:30px;}
  .site-footer{margin-top:56px;padding-top:48px;}
  .footer-bottom{margin-top:36px;}
}
@media (max-width:575.98px){
  .brand-name{font-size:15px;}
  .brand-sub{font-size:9px;letter-spacing:1.4px;}
  .crumb .current{max-width:150px;}
  .article-head h1{font-size:24px;}
  .article-note{font-size:13px;padding:12px 14px;}
  .related-item img{width:64px;height:48px;}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important;}
  html{scroll-behavior:auto;}
}

/* roulang page: category1 */
:root{
  --c-brand:#1B5CFF;
  --c-brand-600:#0F3FC9;
  --c-brand-300:#7FA6FF;
  --c-brand-tint:rgba(27,92,255,.06);
  --c-neon:#2BE8D0;
  --c-neon-2:#7C5CFF;
  --c-ink:#0B1220;
  --c-ink-2:#16203A;
  --t-900:#101828;
  --t-700:#344054;
  --t-500:#667085;
  --t-300:#98A2B3;
  --bg-page:#F4F7FC;
  --bg-card:#FFFFFF;
  --bg-soft:#EDF2FF;
  --line:#E4EAF4;
  --line-strong:#D0DAEA;
  --c-amber:#FFB020;
  --r-s:10px;
  --r-m:14px;
  --r-l:20px;
  --r-pill:999px;
  --sh-s:0 1px 2px rgba(16,24,40,.06);
  --sh-m:0 8px 24px -12px rgba(16,24,40,.18);
  --sh-l:0 24px 48px -28px rgba(13,42,90,.28);
  --sh-h:0 18px 40px -20px rgba(27,92,255,.45);
  --font-cn:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.85;
  color:var(--t-700);
  background:var(--bg-page);
  font-feature-settings:"tnum";
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto;}
a{color:var(--c-brand);text-decoration:none;transition:color .2s ease;}
a:hover{color:var(--c-brand-600);}
ul,ol{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4{margin:0;color:var(--t-900);font-weight:700;letter-spacing:-.2px;}
p{margin:0;}
button{font-family:inherit;}
:focus-visible{outline:2px solid var(--c-neon);outline-offset:2px;border-radius:4px;}

.container{
  width:100%;
  max-width:1200px;
  margin:0 auto;
  padding-left:24px;
  padding-right:24px;
}

/* ============ 顶栏导航 ============ */
.topbar{
  position:sticky;
  top:0;
  z-index:1030;
  background:var(--c-ink);
  transition:box-shadow .2s ease,padding .2s ease;
}
.topbar::after{
  content:"";
  display:block;
  height:2px;
  background:linear-gradient(90deg,var(--c-brand),var(--c-neon));
  box-shadow:0 0 12px rgba(43,232,208,.45);
}
.topbar.scrolled{box-shadow:0 12px 30px -18px rgba(3,10,26,.9);}
.topbar-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  min-height:64px;
}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;}
.logo-mark{
  width:34px;height:34px;flex:0 0 34px;
  border-radius:10px;
  background:linear-gradient(135deg,var(--c-brand),var(--c-neon));
  position:relative;
  box-shadow:0 6px 18px -6px rgba(27,92,255,.85);
}
.logo-mark::after{
  content:"";
  position:absolute;
  inset:9px 9px 9px 9px;
  background:var(--c-ink);
  border-radius:4px;
  transform:skewX(-18deg);
}
.brand-text{display:flex;flex-direction:column;line-height:1.15;}
.brand-name{color:#fff;font-size:17px;font-weight:700;letter-spacing:.2px;}
.brand-sub{color:rgba(255,255,255,.52);font-size:11px;letter-spacing:2px;}

.navtoggle{
  display:none;
  width:44px;height:40px;
  background:transparent;
  border:1px solid rgba(255,255,255,.18);
  border-radius:var(--r-s);
  padding:0;
  position:relative;
  cursor:pointer;
}
.navtoggle span{
  position:absolute;
  left:12px;right:12px;
  height:2px;
  background:#fff;
  border-radius:2px;
  transition:transform .25s ease,opacity .25s ease;
}
.navtoggle span:nth-child(1){top:13px;}
.navtoggle span:nth-child(2){top:19px;}
.navtoggle span:nth-child(3){top:25px;}
.navtoggle[aria-expanded="true"] span:nth-child(1){transform:translateY(6px) rotate(45deg);}
.navtoggle[aria-expanded="true"] span:nth-child(2){opacity:0;}
.navtoggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}

.navcollapse{display:flex;align-items:center;gap:20px;flex:1;justify-content:flex-end;}
.navmenu{display:flex;align-items:center;gap:4px;}
.navmenu a{
  display:inline-flex;
  align-items:center;
  height:40px;
  padding:0 18px;
  border-radius:var(--r-pill);
  font-size:15px;
  color:rgba(255,255,255,.88);
  border:1px solid transparent;
  position:relative;
  transition:background .2s ease,color .2s ease,border-color .2s ease;
}
.navmenu a::after{
  content:"";
  position:absolute;
  left:50%;bottom:5px;
  width:0;height:2px;
  border-radius:2px;
  background:var(--c-neon);
  transform:translateX(-50%);
  transition:width .2s ease;
}
.navmenu a:hover{color:#fff;background:rgba(255,255,255,.06);}
.navmenu a:hover::after{width:18px;}
.navmenu a.active{
  color:var(--c-neon);
  background:rgba(43,232,208,.10);
  border-color:rgba(43,232,208,.45);
  box-shadow:0 0 18px rgba(43,232,208,.30);
}
.navmenu a.active::after{display:none;}
.topbar-cta{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  height:40px;
  padding:0 22px;
  border-radius:var(--r-pill);
  background:var(--c-neon);
  color:var(--c-ink);
  font-size:14px;
  font-weight:700;
  white-space:nowrap;
  transition:filter .2s ease,transform .2s ease,box-shadow .2s ease;
}
.topbar-cta:hover{
  color:var(--c-ink);
  filter:brightness(1.08);
  transform:translateY(-1px);
  box-shadow:0 12px 26px -12px rgba(43,232,208,.95);
}

/* ============ 页头带 ============ */
.page-hero{
  background:
    radial-gradient(680px 300px at 88% -30%,rgba(27,92,255,.13),transparent 70%),
    linear-gradient(180deg,#F7FAFF 0%,var(--bg-soft) 100%);
  border-bottom:1px solid var(--line);
  padding:52px 0 44px;
}
.crumb{margin-bottom:20px;}
.crumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;}
.crumb li{color:var(--t-300);display:inline-flex;align-items:center;}
.crumb li+li::before{content:"/";color:var(--line-strong);margin-right:8px;}
.crumb a{color:var(--t-300);}
.crumb a:hover{color:var(--c-brand);}
.crumb li[aria-current="page"]{color:var(--t-700);}
.hero-tag{
  display:inline-flex;
  align-items:center;
  gap:8px;
  height:30px;
  padding:0 14px;
  border-radius:var(--r-pill);
  border:1px solid rgba(27,92,255,.35);
  background:rgba(255,255,255,.7);
  color:var(--c-brand);
  font-size:12.5px;
  letter-spacing:.3px;
  margin-bottom:16px;
}
.hero-tag::before{
  content:"";
  width:7px;height:7px;border-radius:50%;
  background:var(--c-neon);
  box-shadow:0 0 10px rgba(43,232,208,.9);
}
.page-hero h1{
  font-size:clamp(28px,3.6vw,42px);
  line-height:1.24;
  max-width:820px;
  letter-spacing:-.5px;
}
.page-hero .hero-lead{
  margin-top:16px;
  font-size:17px;
  line-height:1.8;
  color:var(--t-500);
  max-width:720px;
}
.pillbar{
  margin-top:26px;
  display:flex;
  gap:10px;
  overflow-x:auto;
  padding-bottom:4px;
  scrollbar-width:thin;
}
.pillbar::-webkit-scrollbar{height:4px;}
.pillbar::-webkit-scrollbar-thumb{background:var(--line-strong);border-radius:4px;}
.pill{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  height:36px;
  padding:0 18px;
  border-radius:var(--r-pill);
  background:#fff;
  border:1px solid var(--line);
  color:var(--t-700);
  font-size:14px;
  transition:all .2s ease;
}
.pill:hover{border-color:var(--c-brand-300);color:var(--c-brand);}
.pill.active{
  background:var(--c-brand);
  border-color:var(--c-brand);
  color:#fff;
  box-shadow:var(--sh-h);
}

/* ============ 通用板块 ============ */
.section{padding:84px 0;}
.section.tight{padding:64px 0;}
.section.soft{background:var(--bg-soft);}
.section.white{background:var(--bg-card);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:12.5px;
  letter-spacing:1px;
  color:var(--c-brand);
  font-weight:600;
  margin-bottom:12px;
}
.eyebrow::before{
  content:"";
  width:22px;height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--c-brand),var(--c-neon));
}
h2.h2-deco{
  font-size:clamp(23px,2.5vw,32px);
  line-height:1.3;
  margin-bottom:16px;
}
h2.h2-deco::before{
  content:"";
  display:block;
  width:40px;height:4px;
  border-radius:3px;
  background:linear-gradient(90deg,var(--c-brand),var(--c-neon));
  margin-bottom:16px;
}
.section-head{max-width:760px;margin-bottom:44px;}
.section-head p{color:var(--t-500);font-size:16px;}

/* ============ 错落图文 ============ */
.split{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:56px;
  align-items:center;
}
.split + .split{margin-top:72px;}
.split.reverse .split-media{order:2;}
.split-media{
  border-radius:var(--r-l);
  overflow:hidden;
  background:var(--bg-soft);
  box-shadow:var(--sh-l);
  border:1px solid rgba(255,255,255,.7);
  position:relative;
}
.split-media img{
  width:100%;
  aspect-ratio:16/11;
  object-fit:cover;
  transition:transform .5s cubic-bezier(.2,.7,.3,1);
}
.split-media:hover img{transform:scale(1.03);}
.split-media .media-chip{
  position:absolute;
  left:16px;top:16px;
  display:inline-flex;
  align-items:center;
  gap:6px;
  height:28px;
  padding:0 12px;
  border-radius:var(--r-pill);
  background:rgba(11,18,32,.82);
  color:#fff;
  font-size:12px;
  letter-spacing:.4px;
  backdrop-filter:blur(4px);
}
.split-body h3{
  font-size:22px;
  line-height:1.4;
  margin-bottom:14px;
}
.split-body > p{color:var(--t-500);margin-bottom:20px;}
.check-list{display:grid;gap:12px;}
.check-list li{
  display:flex;
  gap:12px;
  align-items:flex-start;
  background:var(--bg-card);
  border:1px solid var(--line);
  border-radius:var(--r-m);
  padding:14px 18px;
  box-shadow:var(--sh-s);
  transition:transform .22s cubic-bezier(.2,.7,.3,1),box-shadow .22s ease,border-color .22s ease;
}
.check-list li:hover{
  transform:translateY(-3px);
  border-color:rgba(27,92,255,.35);
  box-shadow:var(--sh-h);
}
.check-list i{color:var(--c-brand);font-size:15px;margin-top:5px;}
.check-list strong{display:block;color:var(--t-900);font-size:15.5px;font-weight:600;}
.check-list span{display:block;color:var(--t-500);font-size:14px;line-height:1.75;}

/* ============ 场景卡 ============ */
.scene-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:24px;
}
.scene-card{
  background:var(--bg-card);
  border:1px solid var(--line);
  border-radius:var(--r-l);
  padding:28px;
  box-shadow:var(--sh-s);
  transition:transform .22s cubic-bezier(.2,.7,.3,1),box-shadow .22s ease,border-color .22s ease;
  height:100%;
}
.scene-card:hover{
  transform:translateY(-4px);
  border-color:rgba(27,92,255,.35);
  box-shadow:var(--sh-h);
}
.scene-icon{
  width:46px;height:46px;
  border-radius:14px;
  display:grid;place-items:center;
  background:var(--c-brand-tint);
  color:var(--c-brand);
  font-size:19px;
  margin-bottom:18px;
}
.scene-card h3{font-size:18px;margin-bottom:10px;}
.scene-card p{color:var(--t-500);font-size:14.5px;}
.scene-card .scene-tags{
  display:flex;flex-wrap:wrap;gap:8px;margin-top:18px;
}
.tag-soft{
  display:inline-flex;align-items:center;
  height:26px;padding:0 12px;
  border-radius:var(--r-pill);
  background:var(--bg-soft);
  color:var(--c-brand);
  font-size:12.5px;
}
.tag-time{
  display:inline-flex;align-items:center;
  height:26px;padding:0 12px;
  border-radius:var(--r-pill);
  background:#F2F4F7;
  color:var(--t-500);
  font-size:12.5px;
}

/* ============ 排查清单 ============ */
.check-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:20px;
}
.check-item{
  background:var(--bg-card);
  border:1px solid var(--line);
  border-left:4px solid var(--c-brand);
  border-radius:var(--r-m);
  padding:22px 24px;
  box-shadow:var(--sh-s);
  transition:transform .22s ease,box-shadow .22s ease;
}
.check-item:hover{transform:translateY(-3px);box-shadow:var(--sh-m);}
.check-item .num{
  display:inline-block;
  font-size:13px;
  font-weight:700;
  color:var(--c-brand);
  letter-spacing:1px;
  margin-bottom:8px;
}
.check-item h3{font-size:17px;margin-bottom:8px;}
.check-item p{color:var(--t-500);font-size:14.5px;}

/* ============ FAQ ============ */
.faq{max-width:900px;margin:0 auto;}
.faq .accordion-item{
  border:1px solid var(--line);
  border-radius:var(--r-m)!important;
  background:var(--bg-card);
  margin-bottom:12px;
  overflow:hidden;
  box-shadow:var(--sh-s);
}
.faq .accordion-button{
  font-size:16px;
  font-weight:600;
  color:var(--t-900);
  background:var(--bg-card);
  padding:18px 22px;
  box-shadow:none!important;
  display:flex;
  align-items:center;
  gap:12px;
  line-height:1.5;
}
.faq .accordion-button::before{
  content:"";
  width:3px;
  height:16px;
  flex:0 0 3px;
  border-radius:2px;
  background:transparent;
  transition:background .25s ease,height .25s ease;
}
.faq .accordion-button:not(.collapsed){
  color:var(--t-900);
  background:rgba(27,92,255,.04);
}
.faq .accordion-button:not(.collapsed)::before{
  background:var(--c-neon);
  height:22px;
  box-shadow:0 0 10px rgba(43,232,208,.7);
}
.faq .accordion-button::after{
  content:"";
  width:9px;height:9px;
  border-right:2px solid var(--t-500);
  border-bottom:2px solid var(--t-500);
  background-image:none!important;
  transform:rotate(45deg);
  transition:transform .3s ease,border-color .3s ease;
  margin-left:auto;
}
.faq .accordion-button:not(.collapsed)::after{
  transform:rotate(-135deg);
  border-color:var(--c-brand);
}
.faq .accordion-body{
  padding:0 22px 20px 37px;
  font-size:15px;
  line-height:1.85;
  color:var(--t-500);
}
.faq .accordion-button:focus{box-shadow:none;}

/* ============ CTA 条 ============ */
.cta-strip{padding:0 0 96px;}
.cta-inner{
  background:linear-gradient(120deg,#FFFFFF 0%,var(--bg-soft) 100%);
  border:1px solid var(--line);
  border-left:5px solid var(--c-brand);
  border-radius:var(--r-l);
  padding:36px 40px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:32px;
  box-shadow:var(--sh-m);
}
.cta-inner h2{font-size:clamp(20px,2.2vw,26px);margin-bottom:10px;}
.cta-inner p{color:var(--t-500);font-size:15px;}
.cta-actions{display:flex;gap:14px;flex-shrink:0;}

/* ============ 按钮 ============ */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 26px;border-radius:var(--r-pill);font-size:15px;font-weight:600;
  border:1px solid transparent;cursor:pointer;
  transition:transform .2s cubic-bezier(.2,.7,.3,1),box-shadow .2s ease,background .2s ease,color .2s ease,border-color .2s ease;
}
.btn-main{background:var(--c-brand);color:#fff;box-shadow:0 10px 24px -14px rgba(27,92,255,.9);}
.btn-main:hover{background:var(--c-brand-600);color:#fff;transform:translateY(-1px);box-shadow:var(--sh-h);}
.btn-main:active{transform:translateY(0);box-shadow:inset 0 3px 8px rgba(0,0,0,.18);}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--t-700);}
.btn-ghost:hover{border-color:var(--c-brand);color:var(--c-brand);background:var(--c-brand-tint);}
.link-arrow{display:inline-flex;align-items:center;gap:6px;color:var(--c-brand);font-size:14.5px;font-weight:600;}
.link-arrow i{transition:transform .2s ease;}
.link-arrow:hover i{transform:translateX(3px);}

/* ============ 页脚 ============ */
.site-footer{background:var(--c-ink);color:rgba(255,255,255,.68);padding:64px 0 0;}
.footer-grid{
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr 1fr;
  gap:40px;
  padding-bottom:44px;
}
.footer-brand{display:flex;align-items:center;gap:12px;margin-bottom:18px;}
.footer-brand .brand-name{color:#fff;font-size:17px;font-weight:700;}
.footer-desc{font-size:14px;line-height:1.85;color:rgba(255,255,255,.6);max-width:320px;}
.site-footer h4{
  color:var(--c-neon);
  font-size:13px;
  letter-spacing:1.5px;
  font-weight:600;
  margin-bottom:18px;
}
.site-footer ul li{margin-bottom:11px;}
.site-footer ul a{
  color:rgba(255,255,255,.68);
  font-size:14px;
  display:inline-block;
  transition:color .2s ease,transform .2s ease;
}
.site-footer ul a:hover{color:#fff;transform:translateX(2px);}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.08);
  padding:22px 0 26px;
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  justify-content:space-between;
  font-size:13px;
  color:rgba(255,255,255,.48);
}

/* ============ 响应式 ============ */
@media (max-width:1199.98px){
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr;gap:34px;}
  .footer-grid > div:last-child{grid-column:span 3;}
}
@media (max-width:991.98px){
  .topbar-inner{min-height:56px;}
  .navtoggle{display:block;}
  .navcollapse{
    display:block;
    flex-basis:100%;
    flex-grow:1;
    background:var(--c-ink-2);
    border-radius:var(--r-m);
    margin:10px 0 14px;
    padding:12px;
  }
  .navcollapse:not(.show){display:none;}
  .navcollapse.show{display:block;}
  .navmenu{flex-direction:column;align-items:stretch;gap:2px;}
  .navmenu a{
    height:48px;
    border-radius:var(--r-s);
    padding-left:16px;
    border-left:3px solid transparent;
  }
  .navmenu a::after{display:none;}
  .navmenu a:hover{background:rgba(255,255,255,.06);border-left-color:rgba(43,232,208,.5);}
  .navmenu a.active{border-left-color:var(--c-neon);box-shadow:none;}
  .topbar-cta{margin-top:10px;width:100%;}
  .section{padding:72px 0;}
  .split{grid-template-columns:1fr;gap:32px;}
  .split.reverse .split-media{order:0;}
  .split + .split{margin-top:56px;}
  .scene-grid{grid-template-columns:repeat(2,1fr);}
  .cta-inner{flex-direction:column;align-items:flex-start;padding:32px;}
  .cta-actions{flex-wrap:wrap;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .footer-grid > div:last-child{grid-column:span 2;}
}
@media (max-width:767.98px){
  .container{padding-left:16px;padding-right:16px;}
  .page-hero{padding:36px 0 32px;}
  .page-hero .hero-lead{font-size:15.5px;}
  .section{padding:56px 0;}
  .section.tight{padding:48px 0;}
  .check-grid{grid-template-columns:1fr;}
  .scene-grid{grid-template-columns:1fr;}
  .split-body h3{font-size:20px;}
  .cta-strip{padding-bottom:56px;}
  .footer-grid{grid-template-columns:1fr;gap:30px;}
  .footer-grid > div:last-child{grid-column:span 1;}
}
@media (max-width:575.98px){
  .page-hero h1{font-size:27px;}
  .section{padding:44px 0;}
  .btn{width:100%;}
  .cta-actions{width:100%;flex-direction:column;}
  .brand-name{font-size:15.5px;}
  .brand-sub{letter-spacing:1px;}
  .split-media img{aspect-ratio:16/10;}
  .footer-bottom{flex-direction:column;gap:8px;}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important;}
  html{scroll-behavior:auto;}
}

/* roulang page: category2 */
:root{
  --c-brand:#1B5CFF;
  --c-brand-600:#0F3FC9;
  --c-brand-300:#7FA6FF;
  --c-brand-tint:rgba(27,92,255,.06);
  --c-neon:#2BE8D0;
  --c-neon-2:#7C5CFF;
  --c-ink:#0B1220;
  --c-ink-2:#16203A;
  --t-900:#101828;
  --t-700:#344054;
  --t-500:#667085;
  --t-300:#98A2B3;
  --bg-page:#F4F7FC;
  --bg-card:#FFFFFF;
  --bg-soft:#EDF2FF;
  --line:#E4EAF4;
  --line-strong:#D0DAEA;
  --c-amber:#FFB020;
  --r-s:10px;
  --r-m:14px;
  --r-l:20px;
  --r-pill:999px;
  --sh-s:0 1px 2px rgba(16,24,40,.06);
  --sh-m:0 8px 24px -12px rgba(16,24,40,.18);
  --sh-l:0 24px 48px -28px rgba(13,42,90,.28);
  --sh-h:0 18px 40px -20px rgba(27,92,255,.45);
  --sec-y:96px;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",sans-serif;
  font-size:16px;
  line-height:1.85;
  color:var(--t-700);
  background:var(--bg-page);
  font-feature-settings:"tnum";
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:var(--c-brand);text-decoration:none;transition:color .2s ease,border-color .2s ease,background-color .2s ease;}
a:hover{color:var(--c-brand-600);}
button{font-family:inherit;}
h1,h2,h3,h4{color:var(--t-900);margin:0;font-weight:700;letter-spacing:-.2px;}
p{margin:0 0 1.1em;}
ul,ol{margin:0;padding:0;list-style:none;}
:focus-visible{outline:2px solid var(--c-neon);outline-offset:2px;border-radius:6px;}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px;}

/* ============ 顶栏导航 ============ */
.topbar{
  position:sticky;top:0;z-index:1030;
  background:var(--c-ink);
  box-shadow:0 10px 30px -18px rgba(11,18,32,.9);
  transition:box-shadow .2s ease;
}
.topbar::after{
  content:"";display:block;height:2px;
  background:linear-gradient(90deg,var(--c-brand),var(--c-neon));
  box-shadow:0 0 14px rgba(43,232,208,.45);
}
.topbar-inner{display:flex;align-items:center;gap:22px;min-height:64px;}
.brand{display:flex;align-items:center;gap:11px;flex-shrink:0;}
.logo-mark{
  width:34px;height:34px;border-radius:10px;
  background:linear-gradient(140deg,var(--c-brand),var(--c-neon));
  position:relative;flex-shrink:0;
  box-shadow:0 6px 18px -8px rgba(43,232,208,.7);
}
.logo-mark::after{
  content:"";position:absolute;left:9px;top:9px;
  width:16px;height:16px;border-radius:4px;
  background:var(--c-ink);
  transform:skewX(-14deg);
}
.brand-text{display:flex;flex-direction:column;line-height:1.25;}
.brand-name{color:#fff;font-size:17px;font-weight:700;letter-spacing:.2px;}
.brand-sub{color:rgba(255,255,255,.55);font-size:11px;letter-spacing:2px;}
.navtoggle{
  margin-left:auto;width:42px;height:38px;border:0;border-radius:var(--r-s);
  background:rgba(255,255,255,.06);display:inline-flex;flex-direction:column;
  align-items:center;justify-content:center;gap:4px;cursor:pointer;
}
.navtoggle span{display:block;width:18px;height:2px;border-radius:2px;background:#fff;transition:transform .25s ease,opacity .25s ease;}
.navtoggle[aria-expanded="true"] span:nth-child(1){transform:translateY(6px) rotate(45deg);}
.navtoggle[aria-expanded="true"] span:nth-child(2){opacity:0;}
.navtoggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}
.navcollapse{width:100%;}
.navmenu{display:flex;flex-direction:column;gap:2px;}
.navmenu a{
  position:relative;display:block;
  padding:0 18px;height:48px;line-height:48px;
  color:rgba(255,255,255,.88);font-size:15px;border-radius:var(--r-pill);
  border:1px solid transparent;
}
.navmenu a:hover{color:#fff;background:rgba(255,255,255,.06);}
.navmenu a::after{
  content:"";position:absolute;left:18px;bottom:9px;width:0;height:2px;border-radius:2px;
  background:var(--c-neon);transition:width .22s ease;
}
.navmenu a:hover::after{width:18px;}
.navmenu a.active{
  color:var(--c-neon);background:rgba(43,232,208,.10);
  border-color:rgba(43,232,208,.45);
  box-shadow:0 0 18px rgba(43,232,208,.30);
}
.navmenu a.active::after{width:0;}
.topbar-cta{
  display:inline-flex;align-items:center;justify-content:center;
  height:40px;padding:0 20px;border-radius:var(--r-pill);
  background:var(--c-neon);color:var(--c-ink);font-size:14px;font-weight:700;
  white-space:nowrap;transition:transform .2s ease,box-shadow .2s ease,background-color .2s ease;
}
.topbar-cta:hover{background:#4df3dd;color:var(--c-ink);transform:translateY(-1px);box-shadow:0 0 22px rgba(43,232,208,.45);}
@media (max-width:991.98px){
  .topbar-inner{flex-wrap:wrap;min-height:56px;padding:8px 0;}
  .navcollapse{background:var(--c-ink-2);border-radius:var(--r-m);padding:12px;margin-bottom:12px;}
  .navmenu a{border-left:3px solid transparent;border-radius:var(--r-s);line-height:48px;}
  .navmenu a.active{border-left-color:var(--c-neon);}
  .topbar-cta{width:100%;margin-top:8px;}
}
@media (min-width:992px){
  .navtoggle{display:none;}
  .navcollapse.collapse{display:flex !important;height:auto !important;align-items:center;justify-content:space-between;gap:18px;}
  .navmenu{flex-direction:row;align-items:center;}
}

/* ============ 页头带 ============ */
.page-band{
  position:relative;
  padding:56px 0 46px;
  background-color:var(--bg-soft);
  background-image:linear-gradient(180deg,rgba(244,247,252,.72),rgba(237,242,255,.96)),url("/assets/images/backpic/back-1.webp");
  background-size:cover;
  background-position:center;
  border-bottom:1px solid var(--line);
  overflow:hidden;
}
.page-band::before{
  content:"";position:absolute;right:-120px;top:-160px;width:420px;height:420px;border-radius:50%;
  background:radial-gradient(circle,rgba(27,92,255,.12),rgba(27,92,255,0) 68%);
}
.crumb{position:relative;font-size:13px;color:var(--t-300);margin-bottom:18px;}
.crumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px;}
.crumb li{display:flex;align-items:center;gap:8px;}
.crumb li+li::before{content:"/";color:var(--line-strong);}
.crumb a{color:var(--t-300);}
.crumb a:hover{color:var(--c-brand);}
.page-band h1{
  position:relative;font-size:clamp(27px,3.6vw,40px);line-height:1.28;
  max-width:840px;letter-spacing:-.5px;
}
.page-band .lead{
  position:relative;margin:16px 0 0;max-width:720px;
  font-size:16px;color:var(--t-700);
}
.pill-row{
  position:relative;display:flex;gap:10px;margin-top:26px;
  overflow-x:auto;padding-bottom:6px;scrollbar-width:none;
}
.pill-row::-webkit-scrollbar{display:none;}
.pill{
  flex:0 0 auto;display:inline-flex;align-items:center;gap:8px;
  height:38px;padding:0 18px;border-radius:var(--r-pill);
  background:#fff;border:1px solid var(--line-strong);
  color:var(--t-700);font-size:14px;white-space:nowrap;
  transition:all .2s ease;
}
.pill:hover{border-color:var(--c-brand);color:var(--c-brand);background:var(--c-brand-tint);}
.pill.is-on{background:var(--c-brand);border-color:var(--c-brand);color:#fff;box-shadow:0 10px 22px -14px rgba(27,92,255,.9);}
.pill.is-on:hover{color:#fff;background:var(--c-brand-600);}
.pill .dot{width:6px;height:6px;border-radius:50%;background:var(--c-neon);}

/* ============ 通用区块 ============ */
.section{padding:var(--sec-y) 0;}
.section-head{max-width:760px;margin-bottom:44px;}
.sec-line{width:40px;height:12px;border-radius:4px;background:linear-gradient(90deg,var(--c-brand),var(--c-neon));margin-bottom:16px;}
.section-head h2{font-size:clamp(24px,2.6vw,34px);line-height:1.25;}
.section-head p{margin-top:14px;color:var(--t-500);font-size:15px;}
.soft-bg{background:var(--bg-soft);}

/* ============ 错落图文 ============ */
.split{
  display:grid;grid-template-columns:1fr;gap:32px;align-items:center;
  margin-bottom:64px;
}
.split:last-child{margin-bottom:0;}
.split-media{position:relative;border-radius:var(--r-l);overflow:hidden;box-shadow:var(--sh-l);background:var(--bg-soft);}
.split-media img{width:100%;aspect-ratio:16/10;object-fit:cover;}
.split-media .media-badge{
  position:absolute;left:16px;top:16px;
  display:inline-flex;align-items:center;gap:7px;
  padding:6px 14px;border-radius:var(--r-pill);
  background:rgba(11,18,32,.82);color:#fff;font-size:12px;letter-spacing:.3px;
}
.split-media .media-badge i{width:6px;height:6px;border-radius:50%;background:var(--c-neon);display:inline-block;}
.split-body h2{font-size:clamp(22px,2.2vw,28px);line-height:1.3;margin-bottom:16px;}
.split-body p{font-size:16px;color:var(--t-700);}
.tick-list{margin-top:20px;display:grid;gap:12px;}
.tick-list li{
  position:relative;padding-left:30px;font-size:15px;color:var(--t-700);line-height:1.75;
}
.tick-list li::before{
  content:"";position:absolute;left:0;top:9px;width:14px;height:14px;border-radius:4px;
  background:var(--c-brand-tint);border:1px solid rgba(27,92,255,.35);
}
.tick-list li::after{
  content:"";position:absolute;left:4.5px;top:12.5px;width:5px;height:7px;
  border-right:2px solid var(--c-brand);border-bottom:2px solid var(--c-brand);
  transform:rotate(40deg);
}
.step-list{counter-reset:cs;display:grid;gap:14px;margin-top:20px;}
.step-list li{
  counter-increment:cs;position:relative;padding-left:44px;
  font-size:15px;line-height:1.8;color:var(--t-700);
}
.step-list li::before{
  content:counter(cs);position:absolute;left:0;top:2px;
  width:28px;height:28px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  background:#fff;border:1px solid rgba(27,92,255,.35);
  color:var(--c-brand);font-size:13px;font-weight:700;
}
.tag-line{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px;}
.tag{
  display:inline-flex;align-items:center;height:28px;padding:0 14px;
  border-radius:var(--r-pill);background:var(--bg-soft);color:var(--c-brand);
  font-size:13px;font-weight:600;
}
.tag.gray{background:#F2F4F7;color:var(--t-500);font-weight:500;}
@media (min-width:992px){
  .split{grid-template-columns:1fr 1fr;gap:48px;}
  .split.reverse .split-media{order:2;}
  .split.reverse .split-body{order:1;}
}

/* ============ 清单卡 ============ */
.check-grid{display:grid;grid-template-columns:1fr;gap:20px;}
.check-card{
  background:var(--bg-card);border:1px solid var(--line);border-radius:var(--r-l);
  padding:26px 24px;border-left:4px solid var(--c-brand);
  box-shadow:var(--sh-s);transition:transform .22s cubic-bezier(.2,.7,.3,1),box-shadow .22s ease,border-color .22s ease;
}
.check-card:hover{transform:translateY(-4px);box-shadow:var(--sh-h);border-color:rgba(27,92,255,.35);border-left-color:var(--c-neon);}
.check-card .num{
  font-size:13px;font-weight:700;color:var(--c-brand-300);letter-spacing:1.5px;
}
.check-card h3{font-size:17px;margin:10px 0 10px;line-height:1.45;}
.check-card p{font-size:14px;color:var(--t-500);margin:0;line-height:1.8;}
@media (min-width:768px){.check-grid{grid-template-columns:repeat(2,1fr);}}
@media (min-width:992px){.check-grid{grid-template-columns:repeat(4,1fr);}}

/* ============ FAQ ============ */
.faq-wrap{max-width:860px;}
.faq-item{
  background:var(--bg-card);border:1px solid var(--line);border-radius:var(--r-m);
  margin-bottom:12px;overflow:hidden;position:relative;transition:border-color .22s ease,box-shadow .22s ease;
}
.faq-item::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:3px;
  background:var(--c-neon);opacity:0;transition:opacity .22s ease;
}
.faq-item:hover{border-color:rgba(27,92,255,.28);box-shadow:var(--sh-s);}
.faq-item.open{background:linear-gradient(90deg,rgba(27,92,255,.04),rgba(255,255,255,1) 40%);}
.faq-item.open::before{opacity:1;}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  background:none;border:0;text-align:left;cursor:pointer;
  padding:20px 22px;font-size:16px;font-weight:600;color:var(--t-900);
}
.faq-q .caret{flex:0 0 auto;width:18px;height:18px;transition:transform .3s ease;}
.faq-q .caret path{stroke:var(--c-brand);stroke-width:1.8;fill:none;stroke-linecap:round;stroke-linejoin:round;}
.faq-item.open .caret{transform:rotate(180deg);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .32s ease;}
.faq-a p{margin:0;padding:0 22px 20px;font-size:15px;line-height:1.85;color:var(--t-500);max-width:720px;}

/* ============ CTA 条 ============ */
.cta-bar{
  display:grid;grid-template-columns:1fr;gap:22px;align-items:center;
  background:linear-gradient(120deg,#EDF2FF,#F7FAFF 60%,#E9F6F4);
  border:1px solid var(--line);border-radius:var(--r-l);
  padding:32px 28px;box-shadow:var(--sh-m);
}
.cta-bar h2{font-size:clamp(20px,2.2vw,26px);line-height:1.35;}
.cta-bar p{margin:10px 0 0;font-size:15px;color:var(--t-500);}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px;}
.btn-main,.btn-ghost{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 26px;border-radius:var(--r-pill);
  font-size:15px;font-weight:600;cursor:pointer;border:1px solid transparent;
  transition:transform .2s ease,box-shadow .2s ease,background-color .2s ease,color .2s ease,border-color .2s ease;
}
.btn-main{background:var(--c-brand);color:#fff;box-shadow:0 12px 26px -16px rgba(27,92,255,.9);}
.btn-main:hover{background:var(--c-brand-600);color:#fff;transform:translateY(-1px);box-shadow:var(--sh-h);}
.btn-main:active{transform:translateY(0);box-shadow:inset 0 2px 6px rgba(0,0,0,.18);}
.btn-ghost{background:#fff;border-color:var(--line-strong);color:var(--t-700);}
.btn-ghost:hover{border-color:var(--c-brand);color:var(--c-brand);background:var(--c-brand-tint);transform:translateY(-1px);}
@media (min-width:768px){
  .cta-bar{grid-template-columns:1.4fr auto;padding:36px 40px;gap:32px;}
}

/* ============ 页脚 ============ */
.site-footer{
  background:var(--c-ink);color:rgba(255,255,255,.68);
  padding:64px 0 26px;margin-top:20px;
  border-top:2px solid transparent;
  background-image:linear-gradient(var(--c-ink),var(--c-ink)),linear-gradient(90deg,var(--c-brand),var(--c-neon));
  background-origin:border-box;background-clip:padding-box,border-box;
}
.footer-grid{display:grid;grid-template-columns:1fr;gap:32px;}
.footer-brand{display:flex;align-items:center;gap:11px;margin-bottom:14px;}
.footer-brand .brand-name{color:#fff;font-size:17px;font-weight:700;}
.footer-desc{font-size:14px;line-height:1.8;color:rgba(255,255,255,.6);max-width:320px;margin:0;}
.site-footer h4{
  font-size:13px;letter-spacing:1.5px;color:var(--c-neon);
  font-weight:600;margin-bottom:16px;
}
.site-footer ul{display:grid;gap:11px;}
.site-footer ul a{color:rgba(255,255,255,.68);font-size:14px;display:inline-block;transition:transform .2s ease,color .2s ease;}
.site-footer ul a:hover{color:#fff;transform:translateX(2px);}
.footer-bottom{
  margin-top:44px;padding-top:20px;border-top:1px solid rgba(255,255,255,.08);
  display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;
  font-size:13px;color:rgba(255,255,255,.5);
}
@media (min-width:768px){.footer-grid{grid-template-columns:1.6fr 1fr 1fr 1fr;}}
@media (max-width:991.98px){
  :root{--sec-y:72px;}
}
@media (max-width:767.98px){
  :root{--sec-y:56px;}
  .container{padding:0 16px;}
  body{font-size:15px;}
  .split-body h2{font-size:22px;}
  .btn-main,.btn-ghost{width:100%;}
  .cta-actions{width:100%;}
}
@media (max-width:575.98px){
  :root{--sec-y:44px;}
  .page-band{padding:38px 0 34px;}
  .section-head{margin-bottom:30px;}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important;}
  .check-card:hover,.btn-main:hover,.btn-ghost:hover,.topbar-cta:hover{transform:none;}
}

/* roulang page: category3 */
:root{
  --c-brand:#1B5CFF;
  --c-brand-600:#0F3FC9;
  --c-brand-300:#7FA6FF;
  --c-brand-tint:rgba(27,92,255,.06);
  --c-neon:#2BE8D0;
  --c-neon-2:#7C5CFF;
  --c-ink:#0B1220;
  --c-ink-2:#16203A;
  --t-900:#101828;
  --t-700:#344054;
  --t-500:#667085;
  --t-300:#98A2B3;
  --bg-page:#F4F7FC;
  --bg-card:#FFFFFF;
  --bg-soft:#EDF2FF;
  --line:#E4EAF4;
  --line-strong:#D0DAEA;
  --c-amber:#FFB020;
  --r-s:10px;
  --r-m:14px;
  --r-l:20px;
  --r-pill:999px;
  --sh-s:0 1px 2px rgba(16,24,40,.06);
  --sh-m:0 8px 24px -12px rgba(16,24,40,.18);
  --sh-l:0 24px 48px -28px rgba(13,42,90,.28);
  --sh-h:0 18px 40px -20px rgba(27,92,255,.45);
  --ease:cubic-bezier(.2,.7,.3,1);
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  margin:0;
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",sans-serif;
  font-size:16px;
  line-height:1.8;
  color:var(--t-700);
  background:var(--bg-page);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4,p,ul,ol{margin:0;}
ul,ol{padding-left:0;list-style:none;}
a{color:inherit;text-decoration:none;}
img{max-width:100%;height:auto;display:block;}
button{font-family:inherit;}
input,textarea,select{font-family:inherit;}

body .container{
  width:100%;
  max-width:1200px;
  margin:0 auto;
  padding-left:24px;
  padding-right:24px;
}
@media (min-width:1200px){
  body .container{max-width:1200px;}
}

a:focus-visible,
button:focus-visible{
  outline:2px solid var(--c-neon);
  outline-offset:2px;
  border-radius:6px;
}

/* ============ 顶部导航 ============ */
.topbar{
  position:sticky;
  top:0;
  z-index:1030;
  background:var(--c-ink);
  box-shadow:0 1px 0 rgba(43,232,208,.14);
  transition:box-shadow .2s ease;
}
.topbar::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  background:linear-gradient(90deg,var(--c-brand),var(--c-neon));
  opacity:.9;
  pointer-events:none;
}
.topbar.scrolled{box-shadow:0 10px 30px -14px rgba(0,0,0,.75);}
.topbar-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  flex-wrap:wrap;
  min-height:64px;
  padding:6px 0;
}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;}
.logo-mark{
  width:30px;height:30px;border-radius:9px;
  background:linear-gradient(135deg,var(--c-brand),var(--c-neon));
  position:relative;
  flex-shrink:0;
  box-shadow:0 0 16px rgba(43,232,208,.35);
}
.logo-mark::after{
  content:"";
  position:absolute;
  left:8px;top:8px;
  width:14px;height:14px;
  border-radius:4px;
  background:var(--c-ink);
  transform:skewX(-16deg);
}
.brand-text{display:flex;flex-direction:column;line-height:1.15;}
.brand-name{color:#fff;font-size:17px;font-weight:700;letter-spacing:.2px;}
.brand-sub{
  color:rgba(255,255,255,.45);
  font-size:11px;
  letter-spacing:2px;
  margin-top:2px;
}
.navmenu{display:flex;align-items:center;gap:2px;flex-wrap:wrap;}
.navmenu a{
  position:relative;
  display:inline-flex;
  align-items:center;
  height:40px;
  padding:0 18px;
  border-radius:var(--r-pill);
  font-size:15px;
  color:rgba(255,255,255,.88);
  transition:color .2s ease,background .2s ease,box-shadow .2s ease;
}
.navmenu a:hover{
  color:#fff;
  background:rgba(255,255,255,.06);
}
.navmenu a.active{
  color:var(--c-neon);
  background:rgba(43,232,208,.10);
  box-shadow:inset 0 0 0 1px rgba(43,232,208,.45),0 0 18px rgba(43,232,208,.30);
}
.topbar-cta{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  height:40px;
  padding:0 22px;
  border-radius:var(--r-pill);
  background:var(--c-neon);
  color:var(--c-ink);
  font-size:15px;
  font-weight:600;
  white-space:nowrap;
  transition:transform .2s var(--ease),box-shadow .2s ease,background .2s ease;
}
.topbar-cta:hover{
  background:#4df3dd;
  color:var(--c-ink);
  transform:translateY(-1px);
  box-shadow:0 0 22px rgba(43,232,208,.5);
}
.navtoggle{
  display:none;
  width:44px;height:40px;
  border:0;
  background:transparent;
  flex-direction:column;
  justify-content:center;
  gap:5px;
  padding:0 8px;
  cursor:pointer;
}
.navtoggle span{
  display:block;
  height:2px;
  border-radius:2px;
  background:#fff;
  transition:transform .25s ease,opacity .25s ease;
}

@media (min-width:992px){
  .navcollapse{
    display:flex !important;
    flex:1;
    align-items:center;
    justify-content:flex-end;
    gap:18px;
  }
}
@media (max-width:991.98px){
  .topbar-inner{min-height:56px;}
  .navtoggle{display:flex;}
  .navcollapse{
    flex-basis:100%;
    width:100%;
    background:var(--c-ink-2);
    border-radius:var(--r-m);
    padding:10px;
    margin-bottom:12px;
  }
  .navmenu{flex-direction:column;gap:2px;width:100%;}
  .navmenu a{
    display:block;
    width:100%;
    height:48px;
    line-height:48px;
    padding:0 14px;
    border-radius:8px;
    border-left:3px solid transparent;
  }
  .navmenu a.active{
    border-left-color:var(--c-neon);
    box-shadow:none;
  }
  .topbar-cta{
    width:100%;
    margin-top:10px;
    height:44px;
  }
}

/* ============ 页头 ============ */
.page-head{
  position:relative;
  padding:40px 0 52px;
  border-bottom:1px solid var(--line);
  overflow:hidden;
  background-color:#fff;
  background-image:
    linear-gradient(180deg,rgba(255,255,255,.95) 0%,rgba(237,242,255,.95) 100%),
    url("/assets/images/backpic/back-1.webp");
  background-size:cover;
  background-position:center;
}
.page-head::after{
  content:"";
  position:absolute;
  right:-140px;top:-160px;
  width:460px;height:460px;
  border-radius:50%;
  background:radial-gradient(circle,rgba(27,92,255,.13),transparent 66%);
  pointer-events:none;
}
.page-head .container{position:relative;z-index:1;}

.crumb ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-size:13px;
  color:var(--t-300);
}
.crumb li{display:inline-flex;align-items:center;}
.crumb li+li::before{content:"/";color:var(--line-strong);margin-right:8px;}
.crumb a{transition:color .2s ease;}
.crumb a:hover{color:var(--c-brand);}
.crumb li[aria-current] {color:var(--t-500);}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin-top:20px;
  padding:6px 16px;
  border-radius:var(--r-pill);
  background:rgba(255,255,255,.75);
  border:1px solid rgba(27,92,255,.28);
  color:var(--c-brand);
  font-size:13px;
  font-weight:600;
  letter-spacing:.3px;
  box-shadow:var(--sh-s);
}
.eyebrow i{font-size:12px;color:var(--c-neon-2);}

.page-head h1{
  margin-top:16px;
  font-size:clamp(26px,3.8vw,40px);
  font-weight:700;
  line-height:1.25;
  letter-spacing:-.5px;
  color:var(--t-900);
  max-width:860px;
}
.page-head .lead{
  margin-top:14px;
  max-width:740px;
  font-size:16px;
  color:var(--t-500);
}

/* ============ 主体布局 ============ */
.content-wrap{padding:56px 0 24px;}
.help-layout{
  display:grid;
  grid-template-columns:296px minmax(0,1fr);
  gap:48px;
  align-items:start;
}

/* 左侧粘性目录 */
.toc{
  position:sticky;
  top:88px;
  background:var(--bg-card);
  border:1px solid var(--line);
  border-radius:var(--r-l);
  padding:24px;
  box-shadow:var(--sh-s);
}
.toc-title{
  font-size:13px;
  font-weight:600;
  letter-spacing:1.5px;
  color:var(--t-300);
  margin-bottom:14px;
}
.toc-nav{display:flex;flex-direction:column;gap:4px;}
.toc-nav a{
  display:block;
  padding:10px 12px 10px 16px;
  border-radius:var(--r-s);
  border-left:3px solid transparent;
  font-size:15px;
  color:var(--t-700);
  transition:background .2s ease,color .2s ease,border-color .2s ease;
}
.toc-nav a:hover{background:var(--c-brand-tint);color:var(--c-brand);}
.toc-nav a.active{
  background:var(--c-brand-tint);
  color:var(--c-brand);
  font-weight:600;
  border-left-color:var(--c-neon);
  box-shadow:inset 0 0 18px rgba(43,232,208,.14);
}
.toc-help{
  margin-top:22px;
  padding-top:20px;
  border-top:1px dashed var(--line-strong);
}
.toc-help img{
  width:100%;
  aspect-ratio:16/10;
  object-fit:cover;
  border-radius:var(--r-m);
  background:var(--bg-soft);
  border:1px solid var(--line);
}
.toc-help p{
  margin-top:12px;
  font-size:14px;
  line-height:1.7;
  color:var(--t-500);
}
.toc-help a{
  display:inline-flex;
  align-items:center;
  gap:6px;
  margin-top:10px;
  font-size:14px;
  font-weight:600;
  color:var(--c-brand);
}
.toc-help a span{transition:transform .2s ease;}
.toc-help a:hover span{transform:translateX(3px);}

/* 右侧问答区 */
.qa-group{
  margin-bottom:52px;
  scroll-margin-top:96px;
}
.qa-group:last-child{margin-bottom:0;}
.qa-group > h2{
  position:relative;
  padding-top:16px;
  font-size:clamp(20px,2.2vw,26px);
  font-weight:700;
  line-height:1.3;
  color:var(--t-900);
}
.qa-group > h2::before{
  content:"";
  position:absolute;
  top:0;left:0;
  width:40px;height:6px;
  border-radius:var(--r-pill);
  background:linear-gradient(90deg,var(--c-brand),var(--c-neon));
}
.group-intro{
  margin:10px 0 22px;
  font-size:15px;
  color:var(--t-500);
  max-width:680px;
}
.qa-item{
  background:var(--bg-card);
  border:1px solid var(--line);
  border-left:3px solid var(--c-neon);
  border-radius:var(--r-m);
  padding:20px 24px;
  margin-bottom:14px;
  box-shadow:var(--sh-s);
  transition:box-shadow .22s var(--ease),transform .22s var(--ease),border-color .22s ease;
}
.qa-item:last-child{margin-bottom:0;}
.qa-item:hover{
  box-shadow:var(--sh-h);
  transform:translateY(-2px);
  border-color:rgba(27,92,255,.35);
  border-left-color:var(--c-brand);
}
.qa-item h3{
  font-size:16px;
  font-weight:600;
  line-height:1.5;
  color:var(--t-900);
  margin-bottom:8px;
}
.qa-item p{
  font-size:15px;
  line-height:1.85;
  color:var(--t-500);
}
.qa-item p strong{color:var(--t-700);font-weight:600;}

/* ============ 轻量 CTA ============ */
.cta-lite{padding:40px 0 88px;}
.cta-lite-inner{
  position:relative;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:28px;
  flex-wrap:wrap;
  padding:34px 40px;
  border:1px solid var(--line);
  border-radius:var(--r-l);
  background:linear-gradient(135deg,var(--bg-soft),#FFFFFF 78%);
  box-shadow:var(--sh-s);
  overflow:hidden;
}
.cta-lite-inner::before{
  content:"";
  position:absolute;
  left:0;top:0;bottom:0;
  width:4px;
  background:linear-gradient(180deg,var(--c-brand),var(--c-neon));
}
.cta-lite h2{
  font-size:clamp(19px,2.1vw,24px);
  font-weight:700;
  color:var(--t-900);
  line-height:1.35;
}
.cta-lite p{
  margin-top:8px;
  font-size:15px;
  color:var(--t-500);
  max-width:620px;
}
.cta-actions{display:flex;align-items:center;gap:14px;flex-wrap:wrap;}

.btn-primary-c,
.btn-ghost-c{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:44px;
  padding:0 26px;
  border-radius:var(--r-pill);
  font-size:15px;
  font-weight:600;
  white-space:nowrap;
  transition:transform .22s var(--ease),box-shadow .22s ease,background .22s ease,color .22s ease,border-color .22s ease;
}
.btn-primary-c{
  background:var(--c-brand);
  color:#fff;
  border:1px solid var(--c-brand);
}
.btn-primary-c:hover{
  background:var(--c-brand-600);
  border-color:var(--c-brand-600);
  color:#fff;
  transform:translateY(-1px);
  box-shadow:var(--sh-h);
}
.btn-primary-c:active{transform:translateY(0);box-shadow:inset 0 2px 6px rgba(0,0,0,.18);}
.btn-ghost-c{
  background:transparent;
  color:var(--t-700);
  border:1px solid var(--line-strong);
}
.btn-ghost-c:hover{
  border-color:var(--c-brand);
  color:var(--c-brand);
  background:var(--c-brand-tint);
  transform:translateY(-1px);
}

/* ============ 页脚 ============ */
.site-footer{
  background:var(--c-ink);
  color:rgba(255,255,255,.68);
  padding:64px 0 0;
  margin-top:8px;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr 1fr;
  gap:40px;
  padding-bottom:48px;
}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:14px;}
.footer-brand .brand-name{color:#fff;font-size:17px;font-weight:700;}
.footer-desc{
  font-size:14px;
  line-height:1.8;
  color:rgba(255,255,255,.62);
  max-width:330px;
}
.site-footer h4{
  font-size:13px;
  font-weight:600;
  letter-spacing:1.5px;
  color:var(--c-neon);
  margin-bottom:16px;
}
.site-footer ul{display:flex;flex-direction:column;gap:10px;}
.site-footer ul a{
  display:inline-block;
  font-size:14px;
  color:rgba(255,255,255,.68);
  transition:color .2s ease,transform .2s ease;
}
.site-footer ul a:hover{color:#fff;transform:translateX(2px);}
.footer-bottom{
  display:flex;
  justify-content:space-between;
  gap:16px;
  flex-wrap:wrap;
  padding:22px 0;
  border-top:1px solid rgba(255,255,255,.08);
  font-size:13px;
  color:rgba(255,255,255,.5);
}

/* ============ 响应式 ============ */
@media (max-width:991.98px){
  .content-wrap{padding:40px 0 16px;}
  .help-layout{grid-template-columns:1fr;gap:24px;}
  .toc{position:static;padding:16px;}
  .toc-nav{
    flex-direction:row;
    gap:8px;
    overflow-x:auto;
    padding-bottom:6px;
    -webkit-overflow-scrolling:touch;
    scrollbar-width:none;
  }
  .toc-nav::-webkit-scrollbar{display:none;}
  .toc-nav a{
    white-space:nowrap;
    padding:8px 16px;
    border-left:none;
    border:1px solid var(--line);
    border-radius:var(--r-pill);
    font-size:14px;
  }
  .toc-nav a.active{
    background:var(--c-brand);
    color:#fff;
    border-color:var(--c-brand);
    box-shadow:none;
  }
  .toc-help{display:none;}
  .cta-lite-inner{padding:28px 24px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
}

@media (max-width:767.98px){
  .page-head{padding:28px 0 40px;}
  .qa-group{margin-bottom:40px;}
  .qa-item{padding:18px 18px;}
  .cta-lite{padding:24px 0 64px;}
  .cta-actions{width:100%;}
  .cta-actions .btn-primary-c,
  .cta-actions .btn-ghost-c{flex:1 1 160px;}
  .site-footer{padding-top:48px;}
}

@media (max-width:575.98px){
  body{font-size:15px;}
  body .container{padding-left:16px;padding-right:16px;}
  .page-head h1{font-size:26px;}
  .page-head .lead{font-size:15px;}
  .footer-grid{grid-template-columns:1fr;gap:30px;}
  .footer-bottom{flex-direction:column;gap:8px;}
  .brand-name{font-size:16px;}
  .btn-primary-c,.btn-ghost-c{width:100%;}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    transition:none !important;
    animation:none !important;
  }
  .qa-item:hover{transform:none;}
  .btn-primary-c:hover,.btn-ghost-c:hover{transform:none;}
}