/* roulang page: index */
:root{
  --brand:#12A67A;
  --deep:#0B2E27;
  --lime:#D6FF5C;
  --orange:#FF7A45;
  --bg:#F4FAF6;
  --card:#FFFFFF;
  --line:#DCEBE3;
  --text:#16211D;
  --muted:#5C6F68;
  --grad:linear-gradient(135deg,#12A67A 0%,#7BD94A 60%,#D6FF5C 100%);
  --shadow:0 10px 26px rgba(11,46,39,.07);
  --shadow-hover:0 16px 34px rgba(11,46,39,.13);
  --r-lg:20px;
  --r-sm:14px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  font-size:16px;
  line-height:1.7;
  color:var(--text);
  background:var(--bg);
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit}
h1,h2,h3{margin:0;line-height:1.35;letter-spacing:-.2px}
p{margin:0}
ul{list-style:none;margin:0;padding:0}
:focus-visible{outline:2px solid var(--brand);outline-offset:3px}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
.sec{padding:72px 0}
.sec-alt{background:#fff}
.sec-head{margin-bottom:28px}
.sec-head h2{font-size:30px}
.sec-head p{margin-top:10px;color:var(--muted);font-size:15px;max-width:820px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:46px;padding:0 24px;border-radius:999px;
  font-size:15px;font-weight:600;border:1px solid transparent;
  cursor:pointer;transition:transform .18s,box-shadow .18s,background .18s;
}
.btn-primary{background:var(--grad);color:#08281F;box-shadow:0 8px 20px rgba(18,166,122,.28)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(18,166,122,.34)}
.btn-ghost{background:rgba(255,255,255,.12);border-color:rgba(255,255,255,.42);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.22)}
.tag{
  display:inline-block;padding:2px 10px;border-radius:999px;
  background:#EAF6F0;color:#0B4C39;font-size:12px;line-height:20px;
}
.clamp{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* header */
.site-header{position:sticky;top:0;z-index:60;background:#fff;border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;gap:24px;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px;color:var(--deep);flex:0 0 auto}
.logo-mark{
  width:34px;height:34px;border-radius:10px;background:var(--grad);
  display:grid;place-items:center;color:#08281F;font-size:18px;font-weight:800;
}
.nav{display:flex;align-items:center;gap:4px}
.nav-link{
  position:relative;display:inline-flex;align-items:center;
  min-height:44px;padding:0 14px;border-radius:999px;
  font-size:15px;color:var(--muted);background:none;border:0;cursor:pointer;
  transition:color .2s,background .2s;
}
.nav-link:hover{color:var(--deep);background:#EAF6F0}
.nav-link.active{color:var(--deep);font-weight:600}
.nav-link.active::after{
  content:"";position:absolute;left:14px;right:14px;bottom:5px;
  height:3px;border-radius:999px;background:var(--grad);
}
.mega{position:relative}
.mega-panel{
  position:absolute;top:calc(100% + 8px);left:0;
  width:min(92vw,720px);
  display:grid;grid-template-columns:1fr 1fr 1.1fr;gap:24px;
  padding:24px;background:#fff;border:1px solid var(--line);
  border-radius:20px;box-shadow:0 20px 44px rgba(11,46,39,.14);
  opacity:0;visibility:hidden;transform:translateY(6px);
  transition:opacity .18s,transform .18s,visibility .18s;
}
.mega:hover .mega-panel,.mega:focus-within .mega-panel{opacity:1;visibility:visible;transform:translateY(0)}
.mega-panel h3{font-size:13px;color:var(--muted);font-weight:600;margin-bottom:10px;letter-spacing:.4px}
.mega-panel a{display:block;padding:6px 0;font-size:14px;color:var(--deep);transition:color .18s}
.mega-panel a:hover{color:var(--brand)}
.mega-card{
  background:linear-gradient(160deg,#EFFBEE,#F6FDE0);
  border-radius:16px;padding:16px;
}
.mega-card strong{display:block;font-size:14px;margin-bottom:6px}
.mega-card p{font-size:13px;color:var(--muted);margin-bottom:10px}
.mega-card .btn{min-height:38px;padding:0 16px;font-size:13px}
.header-actions{margin-left:auto;display:flex;align-items:center;gap:12px}
.search{
  display:flex;align-items:center;gap:6px;
  background:#F1F8F4;border:1px solid var(--line);
  border-radius:999px;padding:4px 4px 4px 16px;
}
.search input{
  width:150px;border:0;background:none;outline:none;
  font-family:inherit;font-size:14px;color:var(--text);padding:8px 0;
}
.search button{
  border:0;background:var(--brand);color:#fff;border-radius:999px;
  min-height:36px;padding:0 16px;font-size:13px;cursor:pointer;
}
.search button:hover{background:#0E8C67}

/* hero */
.hero{
  position:relative;overflow:hidden;color:#fff;
  padding:88px 0 76px;
  background-image:linear-gradient(100deg,rgba(11,46,39,.95) 0%,rgba(11,46,39,.84) 46%,rgba(11,46,39,.52) 100%),url('/assets/images/637c359a9188285e.jpg');
  background-size:cover;background-position:center;
}
.hero::after{
  content:"";position:absolute;right:-8%;top:-38%;
  width:520px;height:520px;border-radius:90px;
  background:var(--grad);opacity:.16;transform:skewX(-18deg);pointer-events:none;
}
.hero-inner{position:relative;z-index:2;max-width:860px}
.hero-tag{
  display:inline-block;padding:5px 14px;border-radius:999px;
  background:rgba(214,255,92,.16);border:1px solid rgba(214,255,92,.42);
  color:#D6FF5C;font-size:13px;margin-bottom:20px;
}
.hero h1{font-size:clamp(34px,4.6vw,52px);color:#fff}
.hero h1 .hl{
  background:linear-gradient(135deg,#7BD94A,#D6FF5C);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-sub{margin-top:18px;max-width:700px;font-size:16px;color:#D6EAE2;line-height:1.85}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px}
.hero-badges{display:flex;flex-wrap:wrap;gap:12px;margin-top:36px}
.hero-badges li{
  display:flex;align-items:baseline;gap:8px;
  padding:10px 20px;border-radius:999px;
  background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.22);
  backdrop-filter:blur(2px);
}
.hero-badges b{font-size:22px;font-weight:800;font-variant-numeric:tabular-nums;color:#fff}
.hero-badges span{font-size:13px;color:#C6E2D7}

/* metrics */
.metrics{display:grid;grid-template-columns:repeat(5,1fr);gap:20px}
.metric{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);
  padding:22px;box-shadow:var(--shadow);
}
.metric b{display:block;font-size:30px;font-weight:800;color:var(--deep);font-variant-numeric:tabular-nums}
.metric span{display:block;margin-top:4px;font-size:14px;color:var(--muted)}

/* video grid */
.videos{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.vcard{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);
  overflow:hidden;box-shadow:var(--shadow);
  transition:transform .2s,box-shadow .2s;
}
.vcard:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.thumb{
  position:relative;aspect-ratio:16/9;display:flex;align-items:center;justify-content:center;
  font-size:38px;font-weight:800;color:rgba(11,46,39,.2);letter-spacing:2px;
  background:linear-gradient(135deg,#D9F3E7,#F3FBD8);
}
.vcard:nth-child(3n+2) .thumb{background:linear-gradient(135deg,#E4F7DA,#CEF2EC)}
.vcard:nth-child(3n+3) .thumb{background:linear-gradient(135deg,#F2F9CB,#D9F3E7)}
.dur{
  position:absolute;right:8px;bottom:8px;
  background:rgba(11,46,39,.78);color:#fff;font-size:12px;
  padding:2px 8px;border-radius:999px;font-variant-numeric:tabular-nums;
}
.play{
  position:absolute;inset:0;display:grid;place-items:center;
  background:rgba(11,46,39,.3);opacity:0;transition:opacity .2s;
}
.vcard:hover .play{opacity:1}
.play i{
  width:52px;height:52px;border-radius:50%;background:#fff;color:var(--brand);
  display:grid;place-items:center;font-size:18px;font-style:normal;
}
.vbody{padding:16px}
.vbody h3{font-size:16px;margin-bottom:10px}
.vmeta{display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:13px;color:var(--muted)}
.vmeta .num{font-variant-numeric:tabular-nums}

/* uploads */
.uploads{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.up{
  display:flex;gap:16px;align-items:center;
  background:#fff;border:1px solid var(--line);border-radius:16px;
  padding:12px;transition:transform .2s,box-shadow .2s;
}
.up:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.up .thumb{width:152px;flex:0 0 152px;border-radius:12px;font-size:22px}
.up h3{font-size:15px;margin-bottom:6px}
.up .line{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--muted)}
.state{
  display:inline-block;padding:1px 9px;border-radius:999px;font-size:12px;
  background:linear-gradient(135deg,#12A67A,#7BD94A);color:#06251C;font-weight:600;
}

/* channels */
.chans{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.chan{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);
  padding:24px;box-shadow:var(--shadow);transition:transform .2s,box-shadow .2s;
}
.chan:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.chan h3{font-size:18px;margin-bottom:8px}
.chan p{font-size:14px;color:var(--muted);min-height:66px}
.chan a{display:inline-block;margin-top:12px;font-size:14px;color:var(--brand);font-weight:600}
.chan a:hover{color:#0E8C67}

/* compare */
.table-wrap{overflow-x:auto;border-radius:var(--r-lg);border:1px solid var(--line);background:#fff}
.cmp{width:100%;min-width:640px;border-collapse:collapse}
.cmp th,.cmp td{padding:16px 20px;text-align:left;font-size:15px;border-bottom:1px solid var(--line)}
.cmp tbody tr:last-child th,.cmp tbody tr:last-child td{border-bottom:0}
.cmp thead th{background:#F0F9F4;font-size:14px;color:var(--muted);font-weight:600}
.cmp thead th.hl{background:var(--grad);color:#06251C;font-weight:700}
.cmp tbody th{font-weight:600;color:var(--deep);background:#FBFEFC;width:180px}
.cmp .hl{background:#F5FDEE;color:var(--deep);font-weight:600}
.cmp-note{margin-top:14px;font-size:13px;color:var(--muted)}

/* ranking */
.rank{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.rank li{
  display:flex;align-items:center;gap:14px;
  background:#fff;border:1px solid var(--line);border-radius:var(--r-sm);
  padding:12px 16px;transition:background .2s;
}
.rank li:hover{background:#EFFAF3}
.rk{
  flex:0 0 34px;height:34px;border-radius:10px;background:#EAF6F0;color:var(--deep);
  display:grid;place-items:center;font-weight:800;font-variant-numeric:tabular-nums;font-size:15px;
}
.rank li.top .rk{background:var(--grad);color:#06251C}
.rank h3{font-size:15px;flex:1}
.rank .rv{font-size:13px;color:var(--muted);font-variant-numeric:tabular-nums;white-space:nowrap}

/* milestones */
.miles{display:grid;grid-template-columns:repeat(5,1fr);gap:24px}
.mil{position:relative;padding-top:28px}
.mil::before{content:"";position:absolute;top:0;left:0;right:0;height:1px;background:var(--line)}
.mil::after{content:"";position:absolute;top:-5px;left:0;width:11px;height:11px;border-radius:50%;background:var(--brand)}
.mil b{display:block;font-size:20px;color:var(--brand);font-variant-numeric:tabular-nums}
.mil strong{display:block;margin-top:4px;font-size:15px}
.mil p{margin-top:6px;font-size:13px;color:var(--muted)}

/* news */
.news{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden}
.news li{display:flex;align-items:center;gap:16px;padding:16px 20px;border-bottom:1px solid var(--line);transition:background .2s}
.news li:last-child{border-bottom:0}
.news li:hover{background:#F7FCF9}
.news .thumb{width:120px;flex:0 0 120px;border-radius:10px;font-size:18px;aspect-ratio:16/9}
.news h3{font-size:16px;flex:1}
.news .meta{display:flex;align-items:center;gap:12px;font-size:13px;color:var(--muted);white-space:nowrap}

/* topics */
.topics{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.topic{
  background:linear-gradient(160deg,#FFFFFF,#F1FBE8);
  border:1px solid var(--line);border-radius:var(--r-lg);
  padding:22px;transition:transform .2s,box-shadow .2s;
}
.topic:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.topic h3{font-size:17px;margin-bottom:8px}
.topic p{font-size:14px;color:var(--muted);min-height:48px}
.topic .cnt{
  display:inline-block;margin-top:14px;padding:3px 12px;border-radius:999px;
  background:var(--grad);color:#06251C;font-size:12px;font-weight:700;
}

/* scenes */
.scenes{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.scene{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:22px;box-shadow:var(--shadow)}
.scene-ico{
  width:44px;height:44px;border-radius:50%;background:#EAF6F0;
  display:grid;place-items:center;font-size:20px;color:var(--brand);margin-bottom:12px;
}
.scene h3{font-size:17px;margin-bottom:6px}
.scene p{font-size:14px;color:var(--muted);margin-bottom:12px}
.scene a{display:block;font-size:14px;color:var(--deep);padding:4px 0;transition:color .2s}
.scene a:hover{color:var(--brand)}

/* guarantee */
.guards{display:grid;grid-template-columns:repeat(2,1fr);gap:0 48px}
.guard{display:flex;gap:16px;padding:20px 0;border-bottom:1px solid var(--line)}
.guard-ico{
  flex:0 0 44px;width:44px;height:44px;border-radius:50%;background:#EAF6F0;
  display:grid;place-items:center;color:var(--brand);font-size:18px;
}
.guard h3{font-size:16px;margin-bottom:4px}
.guard p{font-size:14px;color:var(--muted)}

/* quick answers */
.qa{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.qa-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px}
.qa-card h3{font-size:16px;margin-bottom:8px}
.qa-card p{font-size:14px;color:var(--muted)}
.qa-more{margin-top:18px;font-size:14px}
.qa-more a{color:var(--brand);font-weight:600}
.qa-more a:hover{color:#0E8C67}

/* faq */
.faq-list details{
  background:#fff;border:1px solid var(--line);border-radius:16px;
  padding:16px 20px;margin-bottom:12px;
}
.faq-list summary{
  cursor:pointer;font-weight:600;font-size:16px;list-style:none;
  display:flex;justify-content:space-between;gap:16px;
}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::after{content:"+";color:var(--brand);font-weight:700;flex:0 0 auto}
.faq-list details[open] summary::after{content:"−"}
.faq-list p{margin-top:10px;font-size:15px;color:var(--muted)}

/* subscribe */
.sub-wrap{
  background:linear-gradient(150deg,#E8FBEF,#F6FDE1);
  border:1px solid var(--line);border-radius:28px;
  padding:40px;display:grid;grid-template-columns:1fr 1.05fr;gap:40px;align-items:center;
}
.sub-wrap h2{font-size:28px;margin-bottom:12px}
.sub-wrap p{color:var(--muted);font-size:15px}
.sub-form .field{margin-bottom:14px}
.sub-form label{display:block;font-size:14px;color:var(--muted);margin-bottom:6px}
.sub-form input,.sub-form select,.sub-form textarea{
  width:100%;min-height:46px;padding:10px 14px;
  border:1px solid var(--line);border-radius:14px;background:#fff;
  font-family:inherit;font-size:15px;color:var(--text);outline:none;
  transition:border-color .2s,box-shadow .2s;
}
.sub-form textarea{min-height:88px;resize:vertical}
.sub-form input:focus,.sub-form select:focus,.sub-form textarea:focus{
  border-color:var(--brand);box-shadow:0 0 0 3px rgba(18,166,122,.16);
}
.sub-form .row{display:grid;grid-template-columns:1fr 1fr;gap:14px}

/* footer */
.site-footer{background:var(--deep);color:#C9E6D9;padding:56px 0 24px}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:32px}
.site-footer h3{color:#fff;font-size:15px;margin-bottom:14px}
.site-footer p{font-size:14px;color:#9CC4B4;margin-top:10px;max-width:320px}
.site-footer a{display:block;padding:5px 0;font-size:14px;color:#C9E6D9;transition:color .2s}
.site-footer a:hover{color:var(--lime)}
.foot-logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px;color:#fff}
.foot-bottom{
  margin-top:36px;padding-top:20px;border-top:1px solid rgba(255,255,255,.14);
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;
  font-size:13px;color:#8FB8A8;
}

@media (max-width:1024px){
  .metrics{grid-template-columns:repeat(3,1fr)}
  .videos{grid-template-columns:repeat(3,1fr)}
  .chans{grid-template-columns:repeat(2,1fr)}
  .topics{grid-template-columns:repeat(2,1fr)}
  .scenes{grid-template-columns:repeat(2,1fr)}
  .miles{grid-template-columns:repeat(3,1fr);gap:20px}
  .sub-wrap{grid-template-columns:1fr;gap:28px;padding:32px}
  .foot-grid{grid-template-columns:1fr 1fr}
  .search input{width:110px}
  .guard p{font-size:13px}
}
@media (max-width:768px){
  .sec{padding:48px 0}
  .sec-head h2{font-size:24px}
  .header-inner{height:auto;flex-wrap:wrap;padding:10px 0;gap:8px}
  .nav{order:3;width:100%;overflow-x:auto}
  .nav::-webkit-scrollbar{display:none}
  .header-actions{margin-left:auto}
  .mega-panel{width:min(90vw,600px);grid-template-columns:1fr 1fr}
  .hero{padding:60px 0 52px}
  .hero-sub{font-size:15px}
  .metrics{grid-template-columns:repeat(2,1fr);gap:14px}
  .videos{grid-template-columns:repeat(2,1fr);gap:16px}
  .uploads{grid-template-columns:1fr}
  .up .thumb{width:128px;flex:0 0 128px}
  .chans{grid-template-columns:1fr}
  .rank{grid-template-columns:1fr}
  .miles{grid-template-columns:repeat(2,1fr)}
  .news li{flex-wrap:wrap}
  .news .thumb{width:96px;flex:0 0 96px}
  .news .meta{width:100%;justify-content:flex-start}
  .topics{grid-template-columns:1fr}
  .scenes{grid-template-columns:repeat(2,1fr);gap:16px}
  .guards{grid-template-columns:1fr;gap:0}
  .qa{grid-template-columns:1fr}
  .sub-form .row{grid-template-columns:1fr}
}
@media (max-width:520px){
  .search{display:none}
  .hero-badges li{padding:8px 14px}
  .hero-badges b{font-size:19px}
  .metrics{grid-template-columns:repeat(2,1fr)}
  .videos{grid-template-columns:repeat(2,1fr);gap:12px}
  .vbody{padding:12px}
  .vbody h3{font-size:14px}
  .vmeta{font-size:12px;flex-wrap:wrap}
  .scenes{grid-template-columns:1fr}
  .miles{grid-template-columns:1fr}
  .sub-wrap{padding:24px;border-radius:22px}
  .sub-wrap h2{font-size:22px}
  .foot-grid{grid-template-columns:1fr}
  .mega-panel{grid-template-columns:1fr;width:88vw}
}