/* roulang page: index */
*,*::before,*::after{box-sizing:border-box}
:root{
  --brand:#2B4C9B;--brand-deep:#1E3A78;--gold:#E8A33D;--teal:#3AA6A0;
  --mist:#F6F8FC;--alt:#F1F5FB;--white:#FFFFFF;
  --ink:#111A2E;--sub:#5A6478;--weak:#8A93A6;--line:#E6EBF5;
  --r:16px;--sh:0 1px 2px rgba(16,24,40,.04),0 12px 32px -14px rgba(43,76,155,.18);
  --sh-h:0 18px 40px -16px rgba(43,76,155,.28);
}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;background:var(--mist);color:var(--ink);font-size:15px;line-height:1.75}
img{display:block;max-width:100%}
a{color:var(--brand);text-decoration:none;transition:color .18s}
h1,h2,h3,p,ul,ol,figure{margin:0}
ul,ol{padding:0;list-style:none}
button,input,textarea{font:inherit;color:inherit}
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible,textarea:focus-visible{outline:2px solid var(--brand);outline-offset:2px}
.wrap{max-width:1200px;margin:0 auto;padding:0 20px}
@media(min-width:768px){.wrap{padding:0 32px}}
@media(min-width:1024px){.wrap{padding:0 48px}}
.sec{padding:56px 0}
@media(min-width:768px){.sec{padding:72px 0}}
@media(min-width:1024px){.sec{padding:96px 0}}
.sec.a{background:var(--alt)}
.sec.w{background:var(--white)}
.sec.j{background:rgba(43,76,155,.06)}
.head{margin-bottom:26px;max-width:820px}
.h2{font-size:22px;font-weight:600;line-height:1.3;letter-spacing:-.01em}
@media(min-width:768px){.h2{font-size:26px}}
.lead{margin-top:8px;color:var(--sub);font-size:14px}
.card{background:var(--white);border-radius:var(--r);box-shadow:var(--sh);padding:22px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:0 22px;border-radius:10px;border:1px solid transparent;font-size:15px;font-weight:600;cursor:pointer;transition:background .18s,border-color .18s,transform .18s,box-shadow .18s}
.btn-p{background:var(--brand);color:#fff}
.btn-p:hover{background:var(--brand-deep);transform:translateY(-1px);color:#fff}
.btn-s{background:#fff;border-color:#D7DFEF;color:var(--brand)}
.btn-s:hover{border-color:var(--brand);background:#F4F7FE}
/* header */
.hd{position:sticky;top:0;z-index:60;background:var(--white);border-bottom:1px solid var(--line);transition:box-shadow .2s}
.hd.on{box-shadow:var(--sh)}
.hd-in{display:flex;align-items:center;justify-content:space-between;gap:16px;height:68px}
.logo{display:flex;flex-direction:column;line-height:1.2;color:var(--ink)}
.logo b{font-size:16px;font-weight:700;letter-spacing:-.01em}
.logo span{font-size:11px;color:var(--weak);font-weight:500}
.nav{display:none;gap:26px;font-size:14px}
@media(min-width:1024px){.nav{display:flex;align-items:center}}
.nav a{color:var(--sub);padding:6px 0;border-bottom:2px solid transparent}
.nav a:hover{color:var(--brand)}
.nav a.active{color:var(--brand);border-bottom-color:var(--brand)}
.hd .btn-p{display:none}
@media(min-width:1024px){.hd .btn-p{display:inline-flex;min-height:40px;padding:0 18px;font-size:14px}}
.burger{display:inline-flex;flex-direction:column;justify-content:center;gap:5px;width:44px;height:44px;padding:0 9px;background:#fff;border:1px solid var(--line);border-radius:10px;cursor:pointer}
.burger i{display:block;height:2px;background:var(--ink);border-radius:2px}
@media(min-width:1024px){.burger{display:none}}
.drawer{display:none;background:#fff;border-bottom:1px solid var(--line);padding:6px 20px 18px}
.drawer.open{display:block}
.drawer a{display:flex;align-items:center;min-height:52px;font-size:15px;color:var(--sub);border-bottom:1px solid var(--line)}
.drawer a:hover{color:var(--brand)}
.drawer .btn{width:100%;margin-top:14px}
body.lock{overflow:hidden}
/* hero */
.hero{position:relative;overflow:hidden;background:var(--mist);padding:36px 0 48px}
@media(min-width:768px){.hero{padding:48px 0 64px}}
@media(min-width:1024px){.hero{padding:56px 0 80px}}
.hero::before{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(43,76,155,.55) 1px,transparent 1px);background-size:26px 26px;opacity:.07;pointer-events:none}
.hero-grid{position:relative;display:grid;gap:28px}
@media(min-width:1024px){.hero-grid{grid-template-columns:7fr 5fr;gap:44px;align-items:start}}
.hero h1{font-size:28px;line-height:1.24;font-weight:700;letter-spacing:-.01em}
@media(min-width:768px){.hero h1{font-size:34px}}
@media(min-width:1024px){.hero h1{font-size:40px}}
.hero-sub{margin-top:14px;color:var(--sub);font-size:15px;max-width:520px}
.hero-acts{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
.status{display:flex;flex-wrap:wrap;gap:0;margin-top:18px;font-size:12px;color:var(--weak)}
.status span{padding:0 12px;border-right:1px solid var(--line)}
.status span:first-child{padding-left:0}
.status span:last-child{border-right:0;padding-right:0}
.igrid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.icell{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 6px;text-align:center;box-shadow:var(--sh)}
.icell b{display:block;font-size:18px;line-height:1.4;color:var(--brand)}
.icell span{display:block;font-size:12px;color:var(--sub);margin-top:2px}
.intro{margin-top:24px;background:#fff;border-radius:var(--r);box-shadow:var(--sh);padding:22px;position:relative}
@media(min-width:1024px){.intro{padding:26px 28px}}
.intro p{font-size:14px;color:var(--sub);line-height:1.85}
.intro .tag{display:inline-block;font-size:12px;color:var(--brand);background:rgba(43,76,155,.08);border-radius:8px;padding:3px 10px;margin-bottom:10px;font-weight:600}
/* stats */
.stats{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
@media(min-width:768px){.stats{grid-template-columns:repeat(3,1fr)}}
@media(min-width:1024px){.stats{grid-template-columns:repeat(6,1fr)}}
.stat{background:#fff;border-radius:14px;box-shadow:var(--sh);padding:18px 10px;text-align:center}
.stat b{display:block;font-size:24px;font-weight:700;color:var(--brand);line-height:1.2;font-variant-numeric:tabular-nums}
.stat span{display:block;font-size:12px;color:var(--weak);margin-top:4px}
/* player */
.player{display:grid;gap:20px}
@media(min-width:1024px){.player{grid-template-columns:1.65fr 1fr;gap:28px;align-items:start}}
.screen{position:relative;aspect-ratio:16/9;border-radius:14px;background:linear-gradient(150deg,#DEE7F8,#EFF4FC);display:grid;place-items:center;overflow:hidden}
.screen .pbtn{width:64px;height:64px;border-radius:50%;background:rgba(255,255,255,.94);color:var(--brand);display:grid;place-items:center;font-size:22px;box-shadow:var(--sh)}
.bar{position:absolute;left:16px;right:16px;bottom:16px;height:4px;border-radius:2px;background:rgba(43,76,155,.18)}
.bar i{display:block;width:38%;height:100%;border-radius:2px;background:var(--brand)}
.chips{margin-top:12px}
.chip{display:inline-block;font-size:12px;padding:5px 11px;border-radius:8px;background:#fff;border:1px solid var(--line);color:var(--sub);margin:0 6px 6px 0}
.chip.on{background:rgba(43,76,155,.08);border-color:var(--brand);color:var(--brand);font-weight:600}
.tl li{display:flex;gap:14px;align-items:baseline;padding:11px 0;border-bottom:1px solid var(--line);font-size:13px}
.tl li:last-child{border-bottom:0}
.tl .t{min-width:44px;color:var(--weak);font-variant-numeric:tabular-nums}
.tl a{color:var(--ink)}
.tl a:hover{color:var(--brand)}
/* matrix */
.matrix{display:grid;gap:14px}
@media(min-width:768px){.matrix{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.matrix{grid-template-columns:repeat(4,1fr)}}
.mcard{background:#fff;border-radius:var(--r);box-shadow:var(--sh);padding:20px;transition:box-shadow .2s,transform .2s}
.mcard:hover{box-shadow:var(--sh-h);transform:translateY(-2px)}
.mcard.big{grid-column:span 2;background:linear-gradient(160deg,#fff,#F7FAFF)}
.mcard h3{font-size:16px;font-weight:600;margin-bottom:6px}
.mcard p{font-size:13px;color:var(--sub);line-height:1.7}
.mico{display:inline-grid;place-items:center;width:36px;height:36px;border-radius:10px;background:rgba(43,76,155,.08);color:var(--brand);font-size:16px;margin-bottom:12px}
/* compare */
.cmp{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden}
.cmp-row{display:grid;grid-template-columns:1fr;border-bottom:1px solid var(--line)}
.cmp-row:last-child{border-bottom:0}
.cmp-row>div{padding:12px 16px;font-size:13px}
.cmp-row .c1{font-weight:600;background:#F9FBFE;color:var(--ink)}
.cmp-row .c2,.cmp-row .c3{color:var(--sub)}
.cmp-row .c3{background:rgba(43,76,155,.05);color:var(--brand-deep);font-weight:500}
.lab{display:inline-block;font-size:11px;color:var(--weak);margin-right:8px;min-width:52px}
.ok::before{content:"✓";display:inline-block;margin-right:6px;color:var(--teal);font-weight:700}
@media(min-width:768px){
  .cmp-row{grid-template-columns:1.1fr 1fr 1fr;align-items:center}
  .cmp-row .c1{background:#F9FBFE}
  .cmp-row:nth-child(even) .c2,.cmp-row:nth-child(even) .c3{background:#FCFDFF}
  .lab{display:none}
}
/* devices */
.dev{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
@media(min-width:1024px){.dev{grid-template-columns:repeat(4,1fr)}}
.dcard{background:#fff;border-radius:var(--r);box-shadow:var(--sh);overflow:hidden;transition:transform .2s,box-shadow .2s}
.dcard:hover{transform:translateY(-2px);box-shadow:var(--sh-h)}
.dcard img{width:100%;aspect-ratio:4/3;object-fit:cover}
.dcard p{padding:12px 14px;font-size:13px;color:var(--sub)}
.dcard b{display:block;font-size:14px;color:var(--ink);margin-bottom:2px}
/* road */
.road{padding-left:20px;border-left:2px solid rgba(43,76,155,.2)}
.node{position:relative;padding-bottom:22px}
.node:last-child{padding-bottom:0}
.node::before{content:"";position:absolute;left:-27px;top:8px;width:10px;height:10px;border-radius:50%;background:var(--brand)}
.node:first-child::before{background:var(--gold)}
.node time{font-size:12px;color:var(--weak);font-variant-numeric:tabular-nums}
.node b{display:block;font-size:15px;font-weight:600;margin:2px 0 2px}
.node p{font-size:13px;color:var(--sub)}
/* news */
.news{display:grid;gap:18px}
@media(min-width:1024px){.news{grid-template-columns:1.12fr 1fr;gap:28px;align-items:start}}
.nc{background:#fff;border-radius:var(--r);box-shadow:var(--sh);overflow:hidden;transition:box-shadow .2s}
.nc:hover{box-shadow:var(--sh-h)}
.nc img{width:100%;aspect-ratio:16/10;object-fit:cover}
.nc div{padding:18px 20px}
.nc h3{font-size:16px;font-weight:600;margin-bottom:6px}
.nc p{font-size:13px;color:var(--sub)}
.nl li{border-bottom:1px solid var(--line)}
.nl li:last-child{border-bottom:0}
.nl a{display:flex;gap:12px;padding:10px 0;align-items:center;color:var(--ink)}
.nl a:hover{color:var(--brand)}
.nl img{width:80px;height:60px;object-fit:cover;border-radius:8px;flex:none}
.nl b{display:block;font-size:14px;font-weight:500;line-height:1.5}
.nl time{font-size:12px;color:var(--weak)}
/* clips */
.clips{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
@media(min-width:1024px){.clips{grid-template-columns:repeat(4,1fr);gap:16px}}
.clip{background:#fff;border-radius:14px;box-shadow:var(--sh);overflow:hidden;transition:transform .2s,box-shadow .2s}
.clip:hover{transform:translateY(-2px);box-shadow:var(--sh-h)}
.clip:hover img{transform:scale(1.04)}
.clip figure{overflow:hidden}
.clip img{width:100%;aspect-ratio:4/5;object-fit:cover;transition:transform .3s}
.clip .cap{padding:10px 12px;display:flex;justify-content:space-between;align-items:center;gap:8px}
.clip b{font-size:13px;font-weight:600}
.clip em{font-style:normal;font-size:11px;color:var(--brand);background:rgba(43,76,155,.08);border-radius:6px;padding:2px 6px;white-space:nowrap}
/* lyric */
.lyr{display:grid;gap:22px}
@media(min-width:1024px){.lyr{grid-template-columns:1fr 1fr;gap:36px;align-items:start}}
.lyric-box{background:#fff;border-radius:var(--r);box-shadow:var(--sh);padding:24px}
.ln{line-height:1.9;font-size:15px;color:var(--sub)}
.ln.on{color:var(--brand);font-weight:600}
.plist li{display:flex;gap:12px;padding:12px 0;border-bottom:1px solid var(--line);font-size:13px;color:var(--sub)}
.plist li:last-child{border-bottom:0}
.plist i{flex:none;width:26px;height:26px;border-radius:8px;background:rgba(232,163,61,.14);color:var(--gold);display:grid;place-items:center;font-style:normal;font-size:12px;font-weight:700}
.plist b{color:var(--ink);font-weight:600;margin-right:6px}
/* trust band */
.trust{position:relative;background-image:url(/assets/images/419d956a290256e8.jpg);background-size:cover;background-position:center}
.trust::before{content:"";position:absolute;inset:0;background:rgba(255,255,255,.93)}
.trust .wrap{position:relative}
.tgrid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
@media(min-width:768px){.tgrid{grid-template-columns:repeat(3,1fr)}}
@media(min-width:1024px){.tgrid{grid-template-columns:repeat(5,1fr)}}
.titem b{display:block;font-size:14px;font-weight:600;margin-bottom:2px}
.titem span{font-size:12px;color:var(--sub)}
.titem em{display:block;font-style:normal;font-size:16px;color:var(--brand);margin-bottom:6px}
/* quick */
.quick{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
@media(min-width:1024px){.quick{grid-template-columns:repeat(4,1fr)}}
.qc{background:#fff;border-radius:14px;box-shadow:var(--sh);padding:18px}
.qc b{display:block;font-size:14px;font-weight:600;margin-bottom:4px}
.qc span{font-size:12px;color:var(--sub);line-height:1.6}
.qc em{display:block;font-style:normal;font-size:15px;color:var(--brand);margin-bottom:8px}
/* faq */
.faq{max-width:900px}
.fitem{background:#fff;border-bottom:1px solid var(--line)}
.fitem:first-child{border-radius:14px 14px 0 0}
.fitem:last-child{border-bottom:0;border-radius:0 0 14px 14px}
.fitem:first-child:last-child{border-radius:14px}
.fitem summary{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:16px 18px;font-size:15px;font-weight:600;cursor:pointer;list-style:none;transition:color .15s}
.fitem summary::-webkit-details-marker{display:none}
.fitem summary::after{content:"+";color:var(--brand);font-size:20px;line-height:1;font-weight:400}
.fitem[open] summary::after{content:"−"}
.fitem summary:hover{color:var(--brand)}
.fbody{padding:0 18px 18px;font-size:13px;color:var(--sub);line-height:1.8;animation:fade .15s ease}
@keyframes fade{from{opacity:0}to{opacity:1}}
/* wall */
.wall{display:grid;grid-template-columns:1fr;gap:14px}
@media(min-width:768px){.wall{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.wall{grid-template-columns:repeat(3,1fr)}}
.wc{background:#fff;border-radius:14px;box-shadow:var(--sh);padding:18px}
.wc .u{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.wc b{font-size:13px;font-weight:600}
.wc .s{color:var(--gold);font-size:12px;letter-spacing:1px}
.wc p{font-size:13px;color:var(--sub)}
/* form */
.join{display:grid;gap:26px}
@media(min-width:1024px){.join{grid-template-columns:1fr 1.15fr;gap:44px;align-items:start}}
.join h2{font-size:22px;font-weight:600}
@media(min-width:768px){.join h2{font-size:26px}}
.join p.d{color:var(--sub);font-size:14px;margin-top:10px}
.jlist{margin-top:16px}
.jlist li{position:relative;padding-left:22px;font-size:13px;color:var(--sub);margin-bottom:8px}
.jlist li::before{content:"";position:absolute;left:0;top:9px;width:8px;height:8px;border-radius:2px;background:var(--brand);opacity:.55}
.form{background:#fff;border-radius:var(--r);box-shadow:var(--sh);padding:22px}
@media(min-width:768px){.form{padding:26px}}
.field{margin-bottom:14px}
.field label{display:block;font-size:13px;color:var(--sub);margin-bottom:6px}
.field input,.field textarea{width:100%;min-height:46px;padding:10px 14px;border:1px solid #D7DFEF;border-radius:10px;background:#FCFDFF;font-size:14px;transition:border-color .18s,background .18s}
.field textarea{min-height:104px;resize:vertical;line-height:1.7}
.field input:focus,.field textarea:focus{border-color:var(--brand);background:#fff;outline:2px solid var(--brand);outline-offset:1px}
.field input:required:invalid:not(:placeholder-shown){border-color:#C9D5EC}
.form .btn{width:100%;margin-top:4px}
.tip{font-size:12px;color:var(--weak);margin-top:10px}
/* topics */
.topic-links{display:grid;gap:10px}
@media(min-width:768px){.topic-links{grid-template-columns:repeat(2,1fr);gap:12px}}
@media(min-width:1024px){.topic-links{grid-template-columns:repeat(3,1fr)}}
.topic-links a{display:flex;justify-content:space-between;align-items:center;gap:10px;min-height:52px;padding:12px 16px;background:#fff;border:1px solid var(--line);border-radius:12px;font-size:14px;color:var(--ink);transition:border-color .2s,box-shadow .2s,color .2s}
.topic-links a:hover{border-color:var(--brand);color:var(--brand);box-shadow:var(--sh)}
.topic-links a i{font-style:normal;color:var(--weak);font-size:13px}
/* footer */
.ft{background:#0F1A33;color:rgba(255,255,255,.7);padding:48px 0 24px;position:relative}
.ft::before{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(255,255,255,.5) 1px,transparent 1px);background-size:32px 32px;opacity:.06;pointer-events:none}
.ft .wrap{position:relative}
.ft-grid{display:grid;gap:28px}
@media(min-width:768px){.ft-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.ft-grid{grid-template-columns:1.4fr 1fr 1fr 1.2fr}}
.ft h4{font-size:14px;color:#fff;font-weight:600;margin:0 0 12px}
.ft p{font-size:13px;line-height:1.8}
.ft li{margin-bottom:8px;font-size:13px}
.ft a{color:rgba(255,255,255,.7);font-size:13px}
.ft a:hover{color:#fff}
.ft .logo b{color:#fff}
.ft .logo span{color:rgba(255,255,255,.55)}
.ft-bot{border-top:1px solid rgba(255,255,255,.12);margin-top:32px;padding-top:18px;font-size:12px;color:rgba(255,255,255,.55);display:flex;flex-wrap:wrap;gap:8px 18px;justify-content:space-between}
@media(max-width:520px){
  .hero h1{font-size:26px}
  .igrid{grid-template-columns:repeat(2,1fr)}
  .status span{padding:0 8px}
  .clips{grid-template-columns:1fr}
  .quick{grid-template-columns:1fr}
  .dev{grid-template-columns:1fr}
}