/* roulang page: index */
:root{
  --blue:#1E63E9;--blue-d:#164BB8;--blue-l:#EAF3FF;
  --coral:#FF5C4D;--ink:#0F1F3D;--text:#33445F;--muted:#6B7C96;
  --line:#E3EDF9;--bg:#F7F9FD;--card:#FFFFFF;--green:#1D9E75;
  --r:14px;--sh:0 8px 28px rgba(20,45,90,.08);--sh-h:0 14px 36px rgba(20,45,90,.12);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
  font-size:15px;line-height:1.7;padding-bottom:88px;
}
h1,h2,h3,h4{margin:0;color:var(--ink);font-weight:800;line-height:1.25;letter-spacing:-.2px}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
:focus-visible{outline:2px solid var(--blue);outline-offset:3px;border-radius:6px}

.container{width:100%;max-width:1200px;margin:0 auto;padding:0 16px}
.section{padding:44px 0}
.sec-head{margin-bottom:22px}
.sec-head h2{font-size:23px}
.sec-head p{margin-top:8px;color:var(--muted);font-size:14px;max-width:700px}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:50;background:#fff;border-bottom:1px solid #E6EEF9}
.nav{display:flex;align-items:center;gap:14px;height:64px}
.brand{display:flex;align-items:center;gap:10px;min-width:0}
.brand__mark{width:40px;height:40px;border-radius:10px;background:var(--blue);color:#fff;font-size:13px;font-weight:800;display:grid;place-items:center;flex:0 0 auto;letter-spacing:.5px}
.brand__name{font-size:16px;font-weight:800;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.nav__links{display:flex;gap:2px;margin-left:auto;overflow-x:auto;scrollbar-width:none;-webkit-overflow-scrolling:touch}
.nav__links::-webkit-scrollbar{display:none}
.nav__links a{padding:8px 10px;border-radius:8px;font-size:14px;color:var(--text);white-space:nowrap;transition:background .2s,color .2s}
.nav__links a:hover{background:var(--blue-l);color:var(--blue-d)}
.nav__links a.is-active{color:var(--blue);font-weight:700;background:var(--blue-l)}

/* ---------- steps ---------- */
.steps{background:#fff;border-bottom:1px solid #E6EEF9}
.steps__inner{display:flex;align-items:center;gap:4px;overflow-x:auto;padding:9px 16px;max-width:1200px;margin:0 auto;scrollbar-width:none}
.steps__inner::-webkit-scrollbar{display:none}
.step{display:flex;align-items:center;gap:7px;flex:0 0 auto;font-size:13px;color:var(--muted);padding:4px 10px;border-radius:999px;transition:.2s}
.step__dot{width:24px;height:24px;border-radius:50%;background:var(--blue-l);color:var(--blue);font-size:12px;font-weight:800;display:grid;place-items:center}
.step:hover{background:var(--blue-l);color:var(--blue-d)}
.step.is-current{background:var(--blue-l);color:var(--blue-d);font-weight:700}
.step.is-current .step__dot{background:var(--blue);color:#fff}
.step-sep{flex:0 0 22px;height:2px;background:#DCE8F8;border-radius:2px}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 22px;border-radius:10px;font-size:15px;font-weight:700;border:1px solid transparent;cursor:pointer;transition:transform .2s,background .2s,box-shadow .2s}
.btn--primary{background:var(--blue);color:#fff}
.btn--primary:hover{background:var(--blue-d);transform:translateY(-1px);box-shadow:0 8px 20px rgba(30,99,233,.25)}
.btn--ghost{background:#fff;color:var(--blue);border-color:var(--blue)}
.btn--ghost:hover{background:var(--blue-l)}

/* ---------- hero ---------- */
.hero{
  padding:36px 0 44px;
  background:linear-gradient(rgba(242,247,255,.94),rgba(247,249,253,.97)),url('/assets/images/7ca040cade846129.jpg') center/cover no-repeat;
}
.hero__grid{display:grid;grid-template-columns:1fr;gap:28px}
.hero__tag{display:inline-block;font-size:12px;font-weight:700;color:var(--blue-d);background:#fff;border:1px solid #DCE8F8;border-radius:999px;padding:4px 12px;margin-bottom:14px}
.hero h1{font-size:30px;line-height:1.2}
.hero h1 .hl{color:var(--coral);background:#FFF0EE;padding:0 4px;border-radius:8px}
.hero__sub{margin-top:14px;font-size:16px;font-weight:600;color:var(--ink)}
.hero__desc{margin-top:12px;color:var(--text)}
.hero__cta{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}
.hero__cta .btn{flex:1 1 160px}
.hero__facts{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}
.fact{display:inline-flex;align-items:center;gap:7px;font-size:13px;color:var(--text);background:#fff;border:1px solid var(--line);border-radius:999px;padding:6px 13px}
.dot{width:8px;height:8px;border-radius:50%;background:var(--green);flex:0 0 auto}
.preview-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.preview{background:#EAF3FF;border:1px solid var(--line);border-radius:12px;overflow:hidden;box-shadow:var(--sh);transition:transform .25s,box-shadow .25s}
.preview:hover{transform:translateY(-3px);box-shadow:var(--sh-h)}
.preview img{width:100%;aspect-ratio:16/9;object-fit:cover}
.preview span{display:block;padding:7px 10px;font-size:12px;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.topic-bar{display:flex;align-items:center;gap:10px;margin-top:10px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:9px 12px;box-shadow:var(--sh);font-size:13px;transition:background .2s}
.topic-bar:hover{background:var(--blue-l)}
.topic-bar__t{flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:var(--ink);font-weight:600}
.topic-bar__c{color:var(--muted);font-size:12px;flex:0 0 auto}

/* ---------- benefits ---------- */
.benefits{display:grid;grid-template-columns:1fr;gap:24px}
.benefit{border-top:3px solid var(--blue);padding-top:16px}
.benefit:nth-child(2){border-top-color:var(--coral)}
.benefit:nth-child(3){border-top-color:#7FA9F5}
.benefit__num{font-size:12px;font-weight:800;color:var(--blue);letter-spacing:1.5px}
.benefit h3{font-size:18px;margin:8px 0 6px}
.benefit p{font-size:14px;color:var(--muted)}

/* ---------- demo ---------- */
.demo{display:grid;grid-template-columns:1fr;gap:14px}
.demo__item{display:block;background:#fff;border:1px solid #E6EEF9;border-radius:var(--r);padding:14px;box-shadow:var(--sh);transition:transform .25s,box-shadow .25s,border-color .25s}
.demo__item:hover{transform:translateY(-4px);box-shadow:var(--sh-h);border-color:rgba(30,99,233,.3)}
.demo__frame{aspect-ratio:16/10;border-radius:10px;background:var(--blue-l);border:1px solid #DCE8F8;display:grid;place-items:center;color:var(--blue);font-size:22px;font-weight:800;margin-bottom:12px}
.demo__item h3{font-size:16px;margin-bottom:6px}
.demo__item p{font-size:13px;color:var(--muted)}

/* ---------- rooms ---------- */
.rooms{display:grid;grid-template-columns:1fr;gap:16px}
.room{background:var(--card);border:1px solid #E6EEF9;border-radius:var(--r);overflow:hidden;box-shadow:var(--sh);transition:transform .25s,box-shadow .25s,border-color .25s;display:flex;flex-direction:column}
.room:hover{transform:translateY(-4px);box-shadow:var(--sh-h);border-color:rgba(30,99,233,.3)}
.room__cover{position:relative;display:block;overflow:hidden;background:#EAF3FF}
.room__cover img{width:100%;aspect-ratio:16/9;object-fit:cover;transition:transform .35s}
.room:hover .room__cover img{transform:scale(1.03)}
.live{position:absolute;left:9px;top:9px;display:inline-flex;align-items:center;gap:5px;background:var(--coral);color:#fff;font-size:11px;font-weight:800;letter-spacing:.5px;padding:3px 8px;border-radius:999px}
.live::before{content:"";width:6px;height:6px;border-radius:50%;background:#fff;animation:pulse 1.6s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.3;transform:scale(.75)}}
.viewers{position:absolute;right:9px;bottom:9px;background:rgba(15,31,61,.72);color:#fff;font-size:11px;padding:2px 8px;border-radius:999px}
.room__body{padding:11px 13px 13px;display:flex;flex-direction:column;gap:9px;flex:1}
.room__title{font-size:15px;font-weight:700;line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.room__meta{display:flex;align-items:center;gap:8px;margin-top:auto;font-size:12px;color:var(--muted);min-width:0}
.avatar{width:24px;height:24px;border-radius:50%;background:var(--blue-l);color:var(--blue);font-size:12px;font-weight:700;display:grid;place-items:center;flex:0 0 auto}
.room__meta .name{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.pill{font-size:11px;color:var(--blue-d);background:var(--blue-l);padding:2px 9px;border-radius:999px;white-space:nowrap;flex:0 0 auto}

/* ---------- upcoming ---------- */
.upcoming{display:grid;grid-template-columns:1fr;gap:14px}
.up{display:flex;align-items:center;gap:12px;background:#fff;border:1px solid #E6EEF9;border-radius:var(--r);padding:12px;box-shadow:var(--sh);transition:transform .25s,box-shadow .25s,border-color .25s}
.up:hover{transform:translateY(-4px);box-shadow:var(--sh-h);border-color:rgba(30,99,233,.3)}
.up__time{flex:0 0 76px;background:var(--blue-l);border-radius:10px;padding:8px 4px;text-align:center}
.up__time b{display:block;font-size:16px;color:var(--blue);font-variant-numeric:tabular-nums}
.up__time span{display:block;font-size:11px;color:var(--blue-d);margin-top:1px}
.up__thumb{flex:0 0 84px;border-radius:8px;overflow:hidden;background:#EAF3FF}
.up__thumb img{width:100%;aspect-ratio:16/9;object-fit:cover}
.up__body{min-width:0;flex:1}
.up__body h3{font-size:14px;margin-bottom:4px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.up__line{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--muted);margin-bottom:4px}
.up__link{font-size:12px;color:var(--blue);font-weight:700}
.up__link:hover{color:var(--blue-d);text-decoration:underline}

/* ---------- categories ---------- */
.cats{display:grid;grid-template-columns:1fr;gap:0}
.cat{display:grid;grid-template-columns:38px 1fr;gap:4px;padding:14px 12px;border-bottom:1px solid var(--line);border-left:3px solid transparent;transition:background .2s,border-left-color .2s}
.cat:hover{background:var(--blue-l);border-left-color:var(--blue)}
.cat__num{font-size:13px;font-weight:800;color:var(--blue);font-variant-numeric:tabular-nums;padding-top:3px}
.cat h3{font-size:16px;margin-bottom:3px}
.cat p{font-size:13px;color:var(--muted);line-height:1.65}

/* ---------- ranking ---------- */
.rank{display:grid;grid-template-columns:1fr;gap:0 36px}
.rank li{display:grid;grid-template-columns:32px 1fr auto auto;align-items:center;gap:8px;padding:11px 8px;border-bottom:1px solid var(--line);font-size:14px;transition:background .2s}
.rank li:hover{background:var(--blue-l)}
.rank__no{font-weight:800;color:var(--muted);font-variant-numeric:tabular-nums;font-size:14px}
.rank-first li:nth-child(-n+3) .rank__no{color:var(--coral)}
.rank__name{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-weight:600;color:var(--ink)}
.rank__num{font-size:13px;color:var(--muted);font-variant-numeric:tabular-nums}

/* ---------- topics ---------- */
.topics{display:grid;grid-template-columns:1fr;gap:12px}
.topic{display:flex;gap:11px;padding:14px;background:#fff;border:1px solid #E6EEF9;border-radius:var(--r);transition:background .2s,border-color .2s}
.topic:hover{background:var(--blue-l);border-color:rgba(30,99,233,.3)}
.topic .avatar{width:36px;height:36px;font-size:14px}
.topic__main{min-width:0;flex:1}
.topic__title{font-size:14px;font-weight:700;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.topic__meta{display:flex;flex-wrap:wrap;gap:8px;font-size:12px;color:var(--muted);margin-top:5px}

/* ---------- social ---------- */
.voices{display:grid;grid-template-columns:1fr;gap:14px}
.voice{background:#fff;border:1px solid #E6EEF9;border-radius:var(--r);padding:15px;box-shadow:var(--sh)}
.voice__head{display:flex;align-items:center;gap:9px;margin-bottom:9px}
.voice__head b{font-size:14px;color:var(--ink)}
.voice p{font-size:14px;color:var(--text);line-height:1.7}
.voice__tag{display:inline-block;margin-top:10px;font-size:11px;color:var(--blue-d);background:var(--blue-l);padding:2px 10px;border-radius:999px}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:18px}
.stat{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 10px;text-align:center;box-shadow:var(--sh)}
.stat b{display:block;font-size:22px;color:var(--blue);font-variant-numeric:tabular-nums;line-height:1.2}
.stat span{font-size:12px;color:var(--muted)}

/* ---------- compare ---------- */
.cmp{width:100%;background:#fff;border:1px solid var(--line);border-radius:var(--r);font-size:14px;overflow:hidden}
.cmp thead{display:none}
.cmp tbody tr{display:block;border-bottom:1px solid var(--line);padding:10px 14px}
.cmp tbody tr:last-child{border-bottom:0}
.cmp td{display:flex;gap:12px;padding:5px 0}
.cmp td::before{content:attr(data-label);flex:0 0 92px;font-size:12px;font-weight:700;color:var(--muted)}
.cmp td:first-child{font-weight:800;color:var(--ink);font-size:15px}
.cmp td:first-child::before{display:none}
.ok{color:var(--green);font-weight:800;flex:0 0 auto}
.no{color:#A9B7CB;font-weight:800;flex:0 0 auto}

/* ---------- news ---------- */
.news{display:grid;grid-template-columns:1fr;gap:20px}
.news__lead{display:block;background:#fff;border:1px solid #E6EEF9;border-radius:var(--r);overflow:hidden;box-shadow:var(--sh);transition:transform .25s,box-shadow .25s}
.news__lead:hover{transform:translateY(-4px);box-shadow:var(--sh-h)}
.news__lead img{width:100%;aspect-ratio:4/3;object-fit:cover}
.news__lead div{padding:14px}
.news__lead h3{font-size:16px;margin-bottom:8px}
.news__meta{display:flex;flex-wrap:wrap;gap:8px;font-size:12px;color:var(--muted);align-items:center}
.news__list li a{display:block;padding:13px 0;border-bottom:1px solid var(--line);transition:color .2s}
.news__list li:last-child a{border-bottom:0}
.news__list h3{font-size:14px;font-weight:700;line-height:1.5;margin-bottom:5px}
.news__list a:hover h3{color:var(--blue)}
.tag{font-size:11px;color:var(--blue-d);background:var(--blue-l);padding:1px 8px;border-radius:999px}

/* ---------- faq ---------- */
.faq details{background:#fff;border:1px solid #E6EEF9;border-radius:12px;padding:0 16px;margin-bottom:12px;transition:border-color .2s,box-shadow .2s}
.faq details[open]{border-left:3px solid var(--blue);box-shadow:var(--sh)}
.faq summary{cursor:pointer;list-style:none;position:relative;padding:15px 32px 15px 0;font-size:16px;font-weight:500;color:var(--ink)}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:0;top:50%;transform:translateY(-50%);font-size:22px;line-height:1;color:var(--blue);transition:transform .25s}
.faq details[open] summary::after{transform:translateY(-50%) rotate(45deg)}
.faq p{padding:0 0 15px;font-size:14px;line-height:1.8;color:var(--text)}

/* ---------- guarantee ---------- */
.guarantee{background:#EAF3FF;border-radius:16px;padding:24px;display:grid;grid-template-columns:1fr;gap:20px}
.g-item h3{font-size:15px;margin-bottom:5px}
.g-item p{font-size:13px;color:var(--text)}
.g-icon{width:32px;height:32px;border-radius:9px;background:#fff;color:var(--blue);display:grid;place-items:center;font-size:15px;font-weight:800;margin-bottom:10px}

/* ---------- footer ---------- */
.site-footer{background:#F2F7FE;border-top:1px solid #E6EEF9;margin-top:20px;padding:36px 0 20px}
.footer__grid{display:grid;grid-template-columns:1fr;gap:26px}
.footer__brand p{font-size:13px;color:var(--muted);margin-top:10px;max-width:340px}
.footer__col h4{font-size:14px;margin-bottom:10px}
.footer__col li{margin-bottom:7px}
.footer__col a{font-size:13px;color:var(--muted);transition:color .2s}
.footer__col a:hover{color:var(--blue)}
.footer__bottom{display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;border-top:1px solid #DCE8F8;margin-top:26px;padding-top:16px;font-size:12px;color:var(--muted)}

/* ---------- bottom bar ---------- */
.bar{position:fixed;left:0;right:0;bottom:0;z-index:40;background:#fff;border-top:1px solid #E6EEF9;box-shadow:0 -6px 24px rgba(20,45,90,.10);padding-bottom:env(safe-area-inset-bottom)}
.bar__inner{max-width:1200px;margin:0 auto;padding:9px 16px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.bar__text{font-size:13px;font-weight:700;color:var(--ink)}
.bar__text span{color:var(--blue)}

@media (min-width:768px){
  .container{padding:0 20px}
  .section{padding:60px 0}
  .sec-head h2{font-size:26px}
  .hero{padding:52px 0 60px}
  .hero h1{font-size:36px}
  .hero__grid{grid-template-columns:7fr 5fr;gap:36px;align-items:center}
  .hero__cta .btn{flex:0 0 auto}
  .benefits{grid-template-columns:1.2fr 1fr .8fr;gap:26px}
  .demo{grid-template-columns:1fr 1fr;gap:16px}
  .rooms{grid-template-columns:1fr 1fr;gap:18px}
  .upcoming{grid-template-columns:1fr 1fr;gap:16px}
  .cats{grid-template-columns:1fr 1fr;gap:0 28px}
  .rank{grid-template-columns:1fr 1fr}
  .topics{grid-template-columns:1fr 1fr}
  .voices{grid-template-columns:1fr 1fr}
  .news{grid-template-columns:1fr 1fr;gap:26px}
  .guarantee{grid-template-columns:1fr 1fr;padding:28px}
  .footer__grid{grid-template-columns:1.4fr 1fr 1fr 1fr}
  .bar__inner{padding:9px 20px}
  .cmp{display:table;border-collapse:collapse;border:1px solid var(--line)}
  .cmp thead{display:table-header-group;background:var(--blue-l)}
  .cmp thead th{text-align:left;padding:14px 18px;font-size:14px;color:var(--blue-d);font-weight:700}
  .cmp tbody tr{display:table-row;border-bottom:0;padding:0}
  .cmp tbody tr:nth-child(even){background:#FBFDFF}
  .cmp td{display:table-cell;padding:14px 18px;border-top:1px solid var(--line)}
  .cmp td::before{display:none}
}
@media (min-width:1024px){
  .container{padding:0 24px}
  .section{padding:84px 0}
  .sec-head{margin-bottom:32px}
  .sec-head h2{font-size:30px}
  .sec-head p{font-size:15px}
  .hero{padding:64px 0 76px}
  .hero__grid{gap:48px}
  .brand__name{font-size:19px}
  .nav__links a{font-size:15px;padding:8px 12px}
  .demo{grid-template-columns:repeat(4,1fr);gap:20px}
  .rooms{grid-template-columns:repeat(4,1fr);gap:20px}
  .topics{grid-template-columns:1fr 1fr;gap:14px}
  .voices{grid-template-columns:repeat(3,1fr)}
  .guarantee{grid-template-columns:repeat(4,1fr);padding:32px}
  .bar{left:50%;right:auto;bottom:16px;transform:translateX(-50%);min-width:660px;border:1px solid #E6EEF9;border-radius:14px}
  .bar__inner{padding:9px 18px}
  body{padding-bottom:96px}
}