/* roulang page: index */
:root{
  --blue:#2B6C9E;--deep:#1D4F75;--light:#E8F1F8;--sand:#D98B3A;
  --ink:#13202C;--muted:#5D6F80;--bg:#F6F9FC;--card:#FFFFFF;
  --line:#DDE7F0;--cline:#E6EEF5;
  --r:14px;--sh:0 8px 24px rgba(19,32,44,.06);--shh:0 16px 40px rgba(19,32,44,.10);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;padding-bottom:64px;
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans SC",sans-serif;
  font-size:16px;line-height:1.75;color:var(--ink);background:var(--bg);
}
img{max-width:100%;display:block}
a{color:var(--blue);text-decoration:none}
button{font:inherit;cursor:pointer;border:0;background:none;color:inherit}
h1,h2,h3,h4{margin:0;line-height:1.25;font-weight:700}
p{margin:0}
section{scroll-margin-top:88px}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}
.btn{display:inline-flex;align-items:center;justify-content:center;height:48px;padding:0 24px;border-radius:10px;font-size:15px;font-weight:600;transition:all .18s;white-space:nowrap}
.btn-main{background:var(--blue);color:#fff}
.btn-main:hover{background:var(--deep);color:#fff;transform:translateY(-2px)}
.btn-ghost{background:#fff;border:1px solid #B9CFDF;color:var(--blue)}
.btn-ghost:hover{background:var(--light);color:var(--blue);transform:translateY(-2px)}
.btn:focus-visible{outline:2px solid var(--sand);outline-offset:2px}
.btn-sm{height:40px;padding:0 18px;font-size:14px}
.tlink{color:var(--blue);font-size:14px;font-weight:600;text-decoration:underline;text-underline-offset:4px;transition:color .18s}
.tlink:hover{color:var(--sand)}

/* header */
.hd{position:sticky;top:0;z-index:90;background:#fff;border-bottom:1px solid var(--line)}
.hd-in{display:flex;align-items:center;gap:20px;height:72px;max-width:1200px;margin:0 auto;padding:0 24px}
.logo{display:flex;align-items:center;gap:12px;color:inherit}
.logo-mark{width:40px;height:40px;flex:0 0 40px;background:var(--blue);color:#fff;border-radius:10px;display:grid;place-items:center;font-size:15px;font-weight:700;letter-spacing:1px}
.logo-txt{display:flex;flex-direction:column;line-height:1.3}
.logo-txt b{font-size:15px;font-weight:700;color:var(--ink)}
.logo-txt span{font-size:12px;color:var(--muted)}
.nav{display:flex;gap:26px;margin-left:auto}
.nav a{position:relative;font-size:15px;color:var(--ink);padding:6px 0;transition:color .18s}
.nav a::after{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:transparent;transition:background .18s}
.nav a:hover,.nav a.on{color:var(--blue)}
.nav a.on::after{background:var(--blue)}
.hd-act{display:flex;align-items:center;gap:10px}
.icon-btn{width:44px;height:44px;display:grid;place-items:center;border-radius:10px;color:var(--deep);transition:background .18s}
.icon-btn:hover{background:var(--light)}
.icon-btn:focus-visible{outline:2px solid var(--sand);outline-offset:2px}
.search{width:0;opacity:0;overflow:hidden;transition:width .18s,opacity .18s}
.search.open{width:220px;opacity:1}
.search input{width:100%;height:44px;border:1px solid var(--line);border-radius:10px;padding:0 14px;font-size:14px;background:#fff;color:var(--ink);outline:none}
.search input:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(43,108,158,.12)}
.burger{display:none;width:44px;height:44px;flex-direction:column;justify-content:center;align-items:center;gap:5px;border-radius:10px}
.burger span{width:20px;height:2px;background:var(--ink);border-radius:2px}

/* off canvas */
.oc{position:fixed;inset:0;z-index:120;visibility:hidden}
.oc.open{visibility:visible}
.oc-mask{position:absolute;inset:0;background:rgba(19,32,44,.42);opacity:0;transition:opacity .18s}
.oc.open .oc-mask{opacity:1}
.oc-panel{position:absolute;right:0;top:0;bottom:0;width:280px;background:#fff;padding:18px 20px;display:flex;flex-direction:column;transform:translateX(100%);transition:transform .18s;box-shadow:-8px 0 32px rgba(19,32,44,.12)}
.oc.open .oc-panel{transform:none}
.oc-head{display:flex;align-items:center;justify-content:space-between;padding-bottom:12px;border-bottom:1px solid var(--line);font-weight:700;font-size:15px}
.oc-close{width:40px;height:40px;border-radius:10px;display:grid;place-items:center;color:var(--muted)}
.oc-panel nav a{display:flex;align-items:center;height:44px;font-size:15px;color:var(--ink);border-bottom:1px solid var(--line)}
.oc-panel nav a:hover{color:var(--blue)}
.oc-cta{margin-top:auto;padding-top:16px}
.oc-cta .btn{width:100%}

/* hero */
.hero{position:relative;background:var(--bg);border-bottom:1px solid var(--line);overflow:hidden}
.hero-bg{position:absolute;inset:0;background:url('/assets/images/93a7164abbe9608a.jpg') center/cover no-repeat;opacity:.12;pointer-events:none}
.hero-in{position:relative;display:grid;grid-template-columns:7fr 5fr;gap:56px;align-items:center;padding:72px 0 80px}
.hero h1{font-size:44px;line-height:1.25;letter-spacing:-.5px}
.hl{position:relative;color:var(--blue);z-index:0}
.hl::after{content:"";position:absolute;left:0;right:0;bottom:3px;height:8px;background:rgba(217,139,58,.30);border-radius:4px;z-index:-1}
.hero-sub{margin-top:18px;font-size:17px;font-weight:600;color:var(--deep)}
.hero-desc{margin-top:14px;max-width:560px;font-size:15px;color:var(--muted)}
.hero-act{display:flex;gap:14px;margin-top:30px;flex-wrap:wrap}
.hero-stats{display:flex;gap:44px;margin-top:38px;padding-top:26px;border-top:1px solid var(--line);flex-wrap:wrap}
.hero-stats b{display:block;font-size:24px;font-variant-numeric:tabular-nums;color:var(--deep);line-height:1.3}
.hero-stats span{font-size:13px;color:var(--muted)}
.hero-vis{position:relative}
.hero-vis img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:16px;box-shadow:0 16px 40px rgba(19,32,44,.14)}
.hv-play{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:64px;height:64px;border-radius:50%;background:rgba(255,255,255,.94);display:grid;place-items:center;box-shadow:0 8px 24px rgba(19,32,44,.18)}
.hv-play::after{content:"";border-left:18px solid var(--blue);border-top:11px solid transparent;border-bottom:11px solid transparent;margin-left:5px}
.hv-card{position:absolute;left:-22px;bottom:-22px;background:#fff;border:1px solid var(--cline);border-radius:12px;padding:12px 16px;box-shadow:var(--sh);display:flex;align-items:center;gap:10px;font-size:13px;color:var(--ink)}
.hv-card b{color:var(--sand);font-size:15px;font-variant-numeric:tabular-nums}

/* sections */
.sec{padding:96px 0}
.sec-white{background:#fff}
.sec-sky{background:var(--light)}
.sec-hd{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:40px}
.sec-hd h2{font-size:28px;color:var(--ink)}
.sec-sub{margin-top:10px;font-size:15px;color:var(--muted);max-width:680px}

/* points */
.pts{display:grid;grid-template-columns:repeat(3,1fr)}
.pt{padding:0 32px;border-left:1px solid var(--line)}
.pt:first-child{border-left:0;padding-left:0}
.pt-no{display:inline-block;font-size:13px;font-weight:700;color:var(--sand);font-variant-numeric:tabular-nums;letter-spacing:1px}
.pt h3{font-size:18px;margin:10px 0 8px}
.pt p{font-size:15px;color:var(--muted)}

/* tabs / scene */
.tablist{display:flex;gap:8px;margin-bottom:32px;border-bottom:1px solid var(--line)}
.tab{height:44px;padding:0 22px;font-size:15px;color:var(--muted);border-bottom:2px solid transparent;transition:all .18s}
.tab:hover{color:var(--blue)}
.tab.on{color:var(--blue);border-bottom-color:var(--blue);font-weight:600}
.tab:focus-visible{outline:2px solid var(--sand);outline-offset:-2px}
.pane{display:none}
.pane.on{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.scene-img img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:14px;box-shadow:var(--sh)}
.steps{list-style:none;margin:0;padding:0;counter-reset:s}
.steps li{position:relative;padding-left:52px;margin-bottom:22px}
.steps li:last-child{margin-bottom:0}
.steps li::before{counter-increment:s;content:"0" counter(s);position:absolute;left:0;top:2px;width:36px;height:36px;border-radius:10px;background:var(--light);color:var(--blue);font-size:13px;font-weight:700;display:grid;place-items:center;font-variant-numeric:tabular-nums}
.steps h4{font-size:16px;margin-bottom:4px}
.steps p{font-size:14px;color:var(--muted)}

/* grid */
.grid{display:grid;gap:24px}
.g2{grid-template-columns:repeat(2,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.g5{grid-template-columns:repeat(5,1fr)}

/* poster card */
.pc{display:block;background:#fff;border:1px solid var(--cline);border-radius:var(--r);overflow:hidden;box-shadow:var(--sh);transition:all .18s;color:inherit}
.pc:hover{transform:translateY(-2px);box-shadow:var(--shh)}
.pc-thumb{position:relative;aspect-ratio:3/4;overflow:hidden;background:var(--light)}
.pc-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .18s}
.pc:hover .pc-thumb img{transform:scale(1.03)}
.badge{position:absolute;left:10px;top:10px;font-size:11px;line-height:1.6;padding:1px 7px;border-radius:4px;background:var(--blue);color:#fff;font-weight:600}
.badge.bd{background:#1F3A4D}
.badge.up{background:var(--sand)}
.score{position:absolute;right:10px;top:10px;font-size:12px;font-weight:700;color:var(--sand);background:rgba(255,255,255,.94);border-radius:4px;padding:1px 7px;font-variant-numeric:tabular-nums}
.pc-body{padding:14px 14px 16px}
.pc-body h3{font-size:15px;line-height:1.4;margin-bottom:6px;color:var(--ink)}
.pc-meta{font-size:12px;color:var(--muted)}

/* horizontal card */
.hc{display:flex;background:#fff;border:1px solid var(--cline);border-radius:var(--r);overflow:hidden;box-shadow:var(--sh);transition:all .18s;color:inherit}
.hc:hover{transform:translateY(-2px);box-shadow:var(--shh)}
.hc-img{flex:0 0 40%;overflow:hidden}
.hc-img img{width:100%;height:100%;object-fit:cover;aspect-ratio:16/9;transition:transform .18s}
.hc:hover .hc-img img{transform:scale(1.03)}
.hc-body{padding:16px 18px;display:flex;flex-direction:column;gap:6px}
.hc-body h3{font-size:16px;color:var(--ink)}
.hc-body p{font-size:13px;color:var(--muted);line-height:1.65}
.hc-foot{margin-top:auto;display:flex;align-items:center;gap:12px;font-size:12px;color:var(--muted)}
.hc-foot b{color:var(--sand);font-size:13px;font-variant-numeric:tabular-nums}

/* channels */
.ch-list{display:grid;grid-template-columns:repeat(5,1fr);gap:0}
.ch{padding:24px 22px 26px;border-top:2px solid var(--blue);border-right:1px solid var(--line);color:inherit;transition:background .18s;display:block}
.ch:last-child{border-right:0}
.ch:hover{background:var(--bg)}
.ch-no{font-size:12px;font-weight:700;color:var(--sand);font-variant-numeric:tabular-nums;letter-spacing:1px}
.ch h3{font-size:17px;margin:8px 0 8px;color:var(--ink)}
.ch p{font-size:13px;color:var(--muted);line-height:1.7}

/* ranking */
.rank-wrap{display:grid;grid-template-columns:1fr 1fr;gap:0 48px}
.rk{display:grid;grid-template-columns:42px 1fr 104px 46px;gap:14px;align-items:center;padding:14px 12px;border-bottom:1px solid var(--line);transition:background .18s;color:inherit}
.rk:hover{background:var(--light)}
.rk-no{font-size:20px;font-weight:700;color:var(--blue);font-variant-numeric:tabular-nums;line-height:1}
.rk-no.top{color:var(--sand)}
.rk-t{font-size:15px;color:var(--ink)}
.rk-tag{display:inline-block;margin-left:8px;font-size:11px;padding:0 6px;border:1px solid var(--line);border-radius:4px;color:var(--muted);line-height:1.7;vertical-align:1px}
.heat{height:4px;border-radius:2px;background:var(--line);overflow:hidden}
.heat i{display:block;height:100%;background:var(--blue);border-radius:2px}
.heat-n{font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums;margin-top:4px}
.rk-sc{font-size:13px;font-weight:700;color:var(--sand);font-variant-numeric:tabular-nums;text-align:right}

/* social proof */
.sp{display:grid;grid-template-columns:4fr 4fr 4fr;gap:24px;align-items:stretch}
.quote{background:#fff;border:1px solid var(--cline);border-radius:var(--r);padding:24px;box-shadow:var(--sh);display:flex;flex-direction:column;gap:14px}
.quote.big{padding:32px}
.quote p{font-size:15px;color:var(--muted);line-height:1.8}
.quote.big p{font-size:16px;color:var(--ink)}
.q-user{display:flex;align-items:center;gap:12px;margin-top:auto}
.ava{width:40px;height:40px;flex:0 0 40px;border-radius:50%;background:var(--light);color:var(--blue);display:grid;place-items:center;font-size:14px;font-weight:700}
.q-user b{display:block;font-size:14px;color:var(--ink)}
.q-user span{font-size:12px;color:var(--sand);font-weight:700}
.q-stack{display:flex;flex-direction:column;gap:24px}
.stats4{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.stats4 div{background:#fff;padding:22px 20px}
.stats4 b{display:block;font-size:24px;color:var(--deep);font-variant-numeric:tabular-nums;line-height:1.3}
.stats4 span{font-size:12px;color:var(--muted)}

/* compare */
.cmp{background:#fff;border:1px solid var(--cline);border-radius:var(--r);overflow:hidden;box-shadow:var(--sh)}
.cmp-row{display:grid;grid-template-columns:1.1fr 1.5fr 1.2fr 1.7fr;gap:20px;padding:18px 24px;border-bottom:1px solid var(--line);font-size:14px}
.cmp-row:last-child{border-bottom:0}
.cmp-row.head{background:var(--light);font-weight:700;color:var(--deep);font-size:14px}
.cmp-row div:nth-child(2){color:var(--blue);font-weight:600}
.cmp-row div:nth-child(3){color:var(--muted)}
.cmp-row div:nth-child(4){color:var(--muted)}
.cmp-row.head div{color:var(--deep)!important;font-weight:700}

/* news */
.news-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px 40px}
.news{display:grid;grid-template-columns:160px 1fr;gap:18px;align-items:center;color:inherit;padding:8px;border-radius:12px;transition:background .18s}
.news:hover{background:var(--bg)}
.news img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:10px}
.news h3{font-size:16px;line-height:1.5;margin-bottom:6px;color:var(--ink)}
.news:hover h3{color:var(--blue)}
.news-meta{display:flex;align-items:center;gap:10px;font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums}
.news-meta em{font-style:normal;padding:0 7px;border-radius:4px;background:var(--light);color:var(--blue);font-size:11px}

/* faq */
.faq{max-width:920px;margin:0 auto}
.faq details{background:#fff;border:1px solid var(--cline);border-radius:12px;margin-bottom:14px;overflow:hidden;transition:background .18s}
.faq details[open]{background:#F3F8FC}
.faq summary{list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 22px;font-size:16px;font-weight:600;color:var(--ink)}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:22px;line-height:1;color:var(--blue);transition:transform .18s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq summary:focus-visible{outline:2px solid var(--sand);outline-offset:-2px}
.faq p{padding:0 22px 20px;font-size:15px;color:var(--muted)}

/* guarantee */
.guar-grid{display:grid;grid-template-columns:repeat(4,1fr)}
.guar-item{padding:0 26px;border-left:1px solid #C6DAE9}
.guar-item:first-child{border-left:0;padding-left:0}
.guar-item h3{font-size:16px;margin-bottom:8px;color:var(--deep)}
.guar-item p{font-size:14px;color:var(--muted)}
.g-ico{width:34px;height:34px;border-radius:9px;background:#fff;display:grid;place-items:center;margin-bottom:12px;color:var(--blue)}

/* footer */
.ft{background:#EEF4F9;padding-top:64px}
.ft-grid{display:grid;grid-template-columns:1.7fr 1fr 1fr 1fr;gap:40px}
.ft-brand .logo{margin-bottom:16px}
.ft-brand p{font-size:13px;color:var(--muted);max-width:280px}
.ft h4{font-size:14px;color:var(--ink);margin-bottom:16px}
.ft ul{list-style:none;margin:0;padding:0}
.ft li{margin-bottom:10px}
.ft li a,.ft li span{font-size:13px;color:var(--muted);transition:color .18s}
.ft li a:hover{color:var(--blue)}
.ft-bot{margin-top:56px;background:var(--ink);color:#fff;padding:18px 0;font-size:13px}
.ft-bot .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.ft-bot a{color:#B9CFDF}

/* fixed bar */
.fbar{position:fixed;left:0;right:0;bottom:0;height:64px;background:#fff;border-top:1px solid var(--line);box-shadow:0 -4px 20px rgba(19,32,44,.07);z-index:100}
.fbar-in{max-width:1200px;height:100%;margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.fbar-txt{font-size:13px;color:var(--muted)}
.fbar-act{display:flex;gap:10px}

@media (max-width:1024px){
  .hd-in{height:60px;gap:12px}
  .nav{display:none}
  .hd-act .search,.hd-act .btn{display:none}
  .burger{display:flex}
  .sec{padding:72px 0}
  .sec-hd h2{font-size:24px}
  .hero h1{font-size:36px}
  .hero-in{grid-template-columns:1fr;gap:40px;padding:56px 0 64px}
  .pts{grid-template-columns:1fr;gap:0}
  .pt{padding:22px 0;border-left:0;border-top:1px solid var(--line)}
  .pt:first-child{border-top:0;padding-top:0}
  .pane.on{grid-template-columns:1fr;gap:28px}
  .g4{grid-template-columns:repeat(3,1fr)}
  .g5{grid-template-columns:repeat(2,1fr)}
  .ch-list{grid-template-columns:repeat(2,1fr)}
  .ch{border-right:0;border-bottom:1px solid var(--line)}
  .sp{grid-template-columns:1fr}
  .q-stack{flex-direction:row}
  .q-stack .quote{flex:1}
  .ft-grid{grid-template-columns:1fr 1fr;gap:32px}
  .guar-grid{grid-template-columns:1fr 1fr;gap:28px 0}
  .guar-item:nth-child(3){border-left:0;padding-left:0}
}
@media (max-width:768px){
  .sec{padding:56px 0}
  .sec-hd{flex-direction:column;align-items:flex-start;gap:12px;margin-bottom:28px}
  .grid{gap:20px}
  .g2{grid-template-columns:1fr}
  .rank-wrap{grid-template-columns:1fr;gap:0}
  .rk{grid-template-columns:38px 1fr 46px}
  .rk .heat,.heat-n{display:none}
  .news-grid{grid-template-columns:1fr;gap:16px}
  .news{grid-template-columns:120px 1fr;gap:14px}
  .cmp-row{display:block;padding:16px 18px}
  .cmp-row.head{display:none}
  .cmp-row>div{display:block;padding:3px 0;font-size:14px}
  .cmp-row>div::before{content:attr(data-l) "：";color:var(--muted);font-weight:600}
  .cmp-row>div:nth-child(2){font-weight:700}
  .q-stack{flex-direction:column}
  .ft-grid{grid-template-columns:1fr 1fr}
  .fbar-txt{display:none}
  .hero-stats{gap:28px}
}
@media (max-width:520px){
  .wrap{padding:0 16px}
  .hd-in{padding:0 16px}
  .hero h1{font-size:30px}
  .hero-sub{font-size:15px}
  .hero-desc{font-size:14px}
  .hero-act .btn{flex:1}
  .hero-stats b{font-size:20px}
  .hv-card{left:10px;bottom:-16px;padding:10px 12px;font-size:12px}
  .sec{padding:48px 0}
  .g4{grid-template-columns:repeat(2,1fr)}
  .g5{grid-template-columns:1fr}
  .ch-list{grid-template-columns:1fr}
  .pc-body{padding:10px 10px 12px}
  .pc-body h3{font-size:14px}
  .hc{flex-direction:column}
  .hc-img{flex:0 0 auto;width:100%}
  .news{grid-template-columns:1fr}
  .stats4 b{font-size:20px}
  .guar-grid{grid-template-columns:1fr;gap:24px}
  .guar-item{border-left:0;padding-left:0}
  .ft-grid{grid-template-columns:1fr;gap:28px}
  .fbar{height:56px}
  body{padding-bottom:56px}
  .fbar-act .btn-ghost{display:none}
  .fbar-act .btn-main{height:40px;font-size:14px;padding:0 16px}
  .ft-bot .wrap{flex-direction:column;gap:6px}
}