/* roulang page: index */
:root{
  --bg-0:#05080F;--bg-1:#0A1120;
  --surface:rgba(17,27,44,.58);
  --line:rgba(122,196,255,.14);
  --primary:#2BE0C8;--accent:#FFB25B;--hot:#FF5D6C;
  --text:#E9EFF8;--text-muted:#93A3B8;
  --r-card:14px;--r-btn:10px;--r-pill:4px;
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --shadow-card:0 1px 0 rgba(255,255,255,.04) inset,0 18px 48px -24px rgba(0,0,0,.8);
  --glow:0 0 0 1px rgba(43,224,200,.45),0 10px 32px -10px rgba(43,224,200,.55);
}
*,*::before,*::after{box-sizing:border-box}
body{margin:0;background:var(--bg-0);color:var(--text);font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none;transition:color .18s ease}
a:hover{color:var(--primary)}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p{margin:0}
button{font:inherit;color:inherit;border:0;background:none;cursor:pointer}
:focus-visible{outline:2px solid var(--primary);outline-offset:3px}
.container{width:100%;max-width:1280px;margin:0 auto;padding:0 24px}

/* header */
.site-header{position:sticky;top:0;z-index:60;background:rgba(5,8,15,.78);-webkit-backdrop-filter:blur(14px) saturate(120%);backdrop-filter:blur(14px) saturate(120%);border-bottom:1px solid var(--line)}
.topline{background:linear-gradient(90deg,rgba(43,224,200,.24),rgba(255,178,91,.20));border-bottom:1px solid var(--line)}
.topline-inner{display:flex;align-items:center;gap:12px;height:32px;font-family:var(--mono);font-size:12px;letter-spacing:.04em;color:#DCE7F5;overflow:hidden;white-space:nowrap}
.dot{width:6px;height:6px;border-radius:50%;background:var(--primary);box-shadow:0 0 10px var(--primary);flex:none}
.nav{display:flex;align-items:center;justify-content:space-between;gap:24px;height:72px}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;letter-spacing:.02em;font-size:17px}
.brand-mark{width:40px;height:40px;border-radius:8px;display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),var(--accent));color:#04141A;font-weight:900;font-size:18px;flex:none}
.nav-links{display:flex;align-items:center;gap:28px;font-size:14px;color:var(--text-muted)}
.nav-links a{position:relative;display:inline-block;padding:8px 0}
.nav-links a::after{content:"";position:absolute;left:0;right:0;bottom:2px;height:1px;background:var(--primary);transform:scaleX(0);transform-origin:left;transition:transform .2s ease}
.nav-links a:hover::after{transform:scaleX(1)}
.nav-links a:hover{color:var(--text)}
.nav-links a.is-active{color:var(--text)}
.nav-links a.is-active::after{transform:scaleX(1)}
.nav-links a.is-active::before{content:"";display:inline-block;width:4px;height:4px;border-radius:50%;background:var(--primary);vertical-align:middle;margin-right:8px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:0 22px;border-radius:var(--r-btn);font-size:15px;font-weight:600;letter-spacing:.01em;transition:transform .18s ease,box-shadow .18s ease,filter .18s ease,color .18s ease,border-color .18s ease}
.btn-primary{background:linear-gradient(180deg,#34EBD2,#1FBFA9);color:#04141A;box-shadow:var(--glow)}
.btn-primary:hover{color:#04141A;filter:brightness(1.08);transform:translateY(-1px);box-shadow:0 0 0 1px rgba(43,224,200,.6),0 16px 44px -12px rgba(43,224,200,.7)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{border:1px solid var(--line);color:var(--text)}
.btn-ghost:hover{border-color:var(--primary);color:var(--primary)}
.btn-sm{min-height:38px;padding:0 16px;font-size:14px}
.nav-cta{flex:none}

/* sections */
section{padding:96px 0;position:relative}
.sec-alt{background:var(--bg-1)}
.sec-head{display:flex;align-items:flex-start;justify-content:space-between;gap:24px;margin-bottom:40px}
.sec-head h2{font-size:clamp(24px,2.6vw,36px);font-weight:800;line-height:1.25;letter-spacing:.01em}
.sec-desc{margin-top:12px;max-width:760px;color:var(--text-muted);font-size:15px;line-height:1.75}
.sec-index{align-self:flex-start;flex:none;font-family:var(--mono);font-size:12px;letter-spacing:.12em;color:var(--primary);border-left:1px solid var(--line);padding:2px 0 2px 12px}

/* hero */
.hero{padding:0;border-bottom:1px solid var(--line);background:url(/assets/images/247600634b9e3723.jpg) center/cover no-repeat;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background:linear-gradient(100deg,rgba(5,8,15,.97) 0%,rgba(5,8,15,.88) 46%,rgba(5,8,15,.58) 100%)}
.hero::after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(122,196,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(122,196,255,.05) 1px,transparent 1px);background-size:40px 40px;pointer-events:none}
.hero-inner{position:relative;z-index:2;padding:76px 0 66px;max-width:800px}
.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.12em;color:var(--primary)}
.hero h1{margin-top:18px;font-size:clamp(36px,5vw,64px);line-height:1.1;font-weight:900;letter-spacing:.01em}
.hero h1 em{font-style:normal;color:var(--accent);text-shadow:0 0 26px rgba(255,178,91,.45)}
.hero-sub{margin-top:18px;font-size:clamp(17px,1.6vw,20px);color:var(--text);font-weight:600}
.hero-lead{margin-top:14px;max-width:620px;font-size:15px;line-height:1.8;color:var(--text-muted)}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:32px}
.chips li{padding:8px 14px;border:1px solid var(--line);border-radius:var(--r-pill);font-size:13px;color:var(--text-muted);background:var(--surface);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}
.chips li:first-child{color:var(--text);border-color:rgba(43,224,200,.45);box-shadow:0 0 0 1px rgba(43,224,200,.14) inset}

/* stats */
.sec-stats{padding:48px 0}
.stats{display:grid;grid-template-columns:repeat(5,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden}
.stat{background:var(--bg-1);padding:24px 20px}
.stat b{display:block;font-family:var(--mono);font-size:clamp(22px,2.4vw,30px);font-weight:700;letter-spacing:.02em;color:var(--accent)}
.stat span{display:block;margin-top:6px;font-size:12px;color:var(--text-muted)}

/* grid & card */
.grid{display:grid;gap:24px}
.g4{grid-template-columns:repeat(4,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);box-shadow:var(--shadow-card);-webkit-backdrop-filter:blur(14px) saturate(120%);backdrop-filter:blur(14px) saturate(120%);transition:transform .18s ease,border-color .18s ease}
.card:hover{transform:translateY(-2px);border-color:rgba(43,224,200,.45)}
.vcard{overflow:hidden}
.thumb{position:relative;aspect-ratio:16/9;overflow:hidden;border-radius:var(--r-card) var(--r-card) 0 0}
.thumb img{width:100%;height:100%;object-fit:cover;transition:filter .18s ease,transform .18s ease}
.card:hover .thumb img{filter:brightness(1.08)}
.dur{position:absolute;left:10px;bottom:10px;font-family:var(--mono);font-size:11px;letter-spacing:.04em;padding:2px 6px;border-radius:var(--r-pill);background:rgba(5,8,15,.8);border:1px solid var(--line);color:var(--text)}
.vbody{padding:14px 16px 16px}
.vbody h3{font-size:15px;font-weight:700;line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.meta{margin-top:10px;font-family:var(--mono);font-size:12px;letter-spacing:.04em;color:var(--text-muted)}
.badge{display:inline-block;padding:1px 6px;margin-left:6px;border:1px solid rgba(43,224,200,.5);border-radius:var(--r-pill);color:var(--primary);font-family:var(--mono);font-size:11px;letter-spacing:.06em}

/* channels */
.chcard{padding:24px;position:relative}
.code{font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:var(--primary)}
.chcard h3{margin:10px 0 8px;font-size:19px;font-weight:700}
.chcard p{font-size:14px;line-height:1.7;color:var(--text-muted);min-height:3.5em}
.chcard::after{content:"";position:absolute;right:18px;bottom:18px;width:8px;height:8px;border:1px solid var(--line);border-radius:50%}
.link-line{display:inline-block;margin-top:16px;padding-bottom:2px;font-size:13px;border-bottom:1px solid var(--line);color:var(--text)}
.link-line:hover{border-color:var(--primary);color:var(--primary)}

/* latest */
.nlist{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.nitem{display:grid;grid-template-columns:150px 1fr;gap:14px;align-items:center;padding:10px}
.nitem .thumb{border-radius:10px;aspect-ratio:16/9}
.nitem h3{font-size:15px;font-weight:700;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.nitem .meta{margin-top:8px}

/* scenes */
.scenes{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.scene{padding:22px 20px;position:relative;border-radius:12px}
.scene .ico{width:34px;height:34px;border:1px solid var(--line);border-radius:8px;display:grid;place-items:center;font-family:var(--mono);font-size:13px;color:var(--primary)}
.scene h3{margin-top:14px;font-size:18px;font-weight:700}
.scene p{margin-top:8px;font-size:14px;line-height:1.7;color:var(--text-muted);min-height:4.8em}

/* demo */
.demo-wrap{display:grid;grid-template-columns:1.35fr .65fr;gap:36px;align-items:center}
.player{position:relative;aspect-ratio:16/9;border-radius:var(--r-card);overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow-card)}
.player img{width:100%;height:100%;object-fit:cover}
.player::before,.player::after{content:"";position:absolute;width:22px;height:22px;pointer-events:none}
.player::before{top:12px;left:12px;border-top:2px solid rgba(43,224,200,.55);border-left:2px solid rgba(43,224,200,.55)}
.player::after{right:12px;bottom:12px;border-right:2px solid rgba(43,224,200,.55);border-bottom:2px solid rgba(43,224,200,.55)}
.pbar{position:absolute;left:16px;right:16px;bottom:44px;height:3px;border-radius:2px;background:rgba(233,239,248,.18)}
.pbar span{display:block;width:38%;height:100%;border-radius:2px;background:linear-gradient(90deg,var(--primary),rgba(43,224,200,0))}
.ptime{position:absolute;left:16px;bottom:16px;font-family:var(--mono);font-size:12px;color:var(--text-muted);letter-spacing:.04em}
.points li{display:flex;gap:14px;padding:16px 0;border-bottom:1px solid var(--line)}
.points li:first-child{padding-top:0}
.points b{flex:none;font-family:var(--mono);font-size:12px;letter-spacing:.12em;color:var(--primary);padding-top:4px}
.points h3{font-size:16px;font-weight:700}
.points p{margin-top:4px;font-size:14px;line-height:1.7;color:var(--text-muted)}

/* rank */
.rank{display:grid;grid-template-columns:1fr 1fr;grid-auto-flow:column;grid-template-rows:repeat(5,auto);gap:0 40px}
.rank li{display:grid;grid-template-columns:56px 1fr auto;align-items:center;gap:14px;padding:12px 8px;border-bottom:1px solid var(--line);transition:background .18s ease}
.rank li:hover{background:rgba(43,224,200,.06)}
.rank .no{font-family:var(--mono);font-size:20px;letter-spacing:.02em;color:rgba(233,239,248,.32);border:1px solid var(--line);border-radius:var(--r-pill);text-align:center;padding:2px 0}
.rank .top3 .no{color:var(--accent);border-color:rgba(255,178,91,.5);text-shadow:0 0 18px rgba(255,178,91,.55)}
.rank h3{font-size:15px;font-weight:600;line-height:1.5;display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical;overflow:hidden}
.rank .meta{margin:0;white-space:nowrap}

/* topics */
.topic{position:relative;overflow:hidden;min-height:180px;padding:22px;display:flex;flex-direction:column;justify-content:flex-end;border:1px solid var(--line);border-radius:var(--r-card);clip-path:polygon(0 0,calc(100% - 20px) 0,100% 20px,100% 100%,0 100%);transition:transform .18s ease,border-color .18s ease}
.topic img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.42;transition:opacity .18s ease,filter .18s ease}
.topic::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(5,8,15,.35),rgba(5,8,15,.92))}
.topic:hover{transform:translateY(-2px);border-color:rgba(43,224,200,.45)}
.topic:hover img{opacity:.55;filter:brightness(1.08)}
.topic h3,.topic p,.topic .meta{position:relative;z-index:2}
.topic h3{font-size:18px;font-weight:800}
.topic p{margin-top:6px;font-size:13px;line-height:1.65;color:var(--text-muted)}

/* creators */
.creators{display:flex;gap:16px;overflow-x:auto;padding-bottom:8px}
.creator{flex:0 0 180px;padding:22px 16px;text-align:center}
.creator img{width:64px;height:64px;border-radius:50%;object-fit:cover;margin:0 auto 12px;border:1px solid var(--line)}
.creator h3{font-size:15px;font-weight:700}
.creator .meta{margin-top:4px}
.creator .link-line{margin-top:12px}

/* plans */
.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;align-items:start}
.plan{padding:28px 24px;position:relative}
.plan h3{font-size:18px;font-weight:800}
.plan .price{margin-top:14px;font-family:var(--mono);font-size:34px;font-weight:700;color:var(--accent);letter-spacing:.02em}
.plan .price small{font-size:13px;color:var(--text-muted);font-weight:400;letter-spacing:0}
.plan ul{margin:18px 0 22px}
.plan ul li{padding:10px 0;border-bottom:1px dashed var(--line);font-size:14px;color:var(--text-muted)}
.plan ul li::before{content:"—";color:var(--primary);margin-right:8px;font-family:var(--mono)}
.plan .btn{width:100%}
.plan.is-rec{border-color:rgba(43,224,200,.6);box-shadow:0 0 46px -20px rgba(43,224,200,.85),var(--shadow-card)}
.tag-rec{position:absolute;top:16px;right:16px;padding:2px 8px;border-radius:var(--r-pill);border:1px solid rgba(255,178,91,.5);color:var(--accent);font-size:11px;font-family:var(--mono);letter-spacing:.08em}
.plan-note{margin-top:20px;font-size:13px;color:var(--text-muted)}

/* reviews */
.reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;align-items:start}
.review{padding:22px;position:relative}
.review p{margin-top:12px;font-size:14px;line-height:1.75;color:var(--text-muted)}
.review .who{font-size:14px;font-weight:700}
.stars{font-family:var(--mono);font-size:13px;letter-spacing:.22em;color:var(--accent)}

/* voice */
.voice{display:grid;grid-template-columns:.9fr 1.1fr;gap:44px;align-items:center}
.vstats li{display:flex;align-items:baseline;justify-content:space-between;gap:16px;padding:14px 0;border-bottom:1px solid var(--line)}
.vstats b{font-family:var(--mono);font-size:24px;color:var(--accent);letter-spacing:.02em}
.vstats span{font-size:14px;color:var(--text-muted)}
.voice blockquote{margin:0;padding-left:20px;border-left:3px solid var(--primary);font-size:17px;line-height:1.85}
.voice cite{display:block;margin-top:16px;padding-left:20px;font-style:normal;font-size:13px;color:var(--text-muted);font-family:var(--mono);letter-spacing:.06em}

/* news */
.news{display:grid;grid-template-columns:1fr 1fr;gap:0 40px}
.nrow{display:grid;grid-template-columns:130px 1fr;gap:16px;padding:16px 0;border-bottom:1px solid var(--line)}
.nrow .thumb{aspect-ratio:16/9;border-radius:8px}
.nrow h3{font-size:15px;font-weight:700;line-height:1.5}
.nrow p{margin-top:6px;font-size:13px;line-height:1.65;color:var(--text-muted)}
.nrow time{display:block;margin-top:8px;font-family:var(--mono);font-size:12px;color:var(--text-muted);letter-spacing:.04em}

/* faq */
.faq details{border-bottom:1px solid var(--line)}
.faq summary{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:64px;padding:20px 0;font-size:16px;font-weight:600;cursor:pointer;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:var(--mono);font-size:20px;color:var(--primary);flex:none}
.faq details[open] summary::after{content:"−"}
.faq p{padding:0 0 22px;max-width:920px;font-size:15px;line-height:1.85;color:var(--text-muted)}

/* cta */
.sec-cta{padding:96px 0}
.cta{position:relative;overflow:hidden;padding:64px 40px;border:1px solid var(--line);border-radius:18px;text-align:center;background:radial-gradient(120% 150% at 50% 0%,rgba(43,224,200,.18),transparent 62%),var(--bg-1);box-shadow:var(--shadow-card)}
.cta h2{font-size:clamp(24px,3vw,38px);font-weight:900;line-height:1.25}
.cta p{margin:16px auto 0;max-width:620px;font-size:15px;line-height:1.8;color:var(--text-muted)}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px;justify-content:center;margin-top:30px}

/* footer */
.site-footer{border-top:1px solid var(--line);background:var(--bg-1);padding:64px 0 28px}
.foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:32px}
.foot-grid h4{margin:0 0 14px;font-family:var(--mono);font-size:12px;letter-spacing:.16em;color:var(--text-muted);font-weight:600}
.foot-brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:16px}
.foot-grid p{margin-top:14px;font-size:14px;line-height:1.8;color:var(--text-muted);max-width:320px}
.foot-grid li{padding:6px 0;font-size:14px;color:var(--text-muted)}
.copyright{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;margin-top:40px;padding-top:20px;border-top:1px solid var(--line);font-size:13px;color:var(--text-muted)}

@media(max-width:1024px){
  section,.sec-cta{padding:72px 0}
  .sec-stats{padding:40px 0}
  .g4{grid-template-columns:repeat(3,1fr)}
  .g3{grid-template-columns:repeat(2,1fr)}
  .scenes{grid-template-columns:repeat(2,1fr)}
  .demo-wrap{grid-template-columns:1fr;gap:28px}
  .voice{grid-template-columns:1fr;gap:28px}
  .news{grid-template-columns:1fr;gap:0}
  .foot-grid{grid-template-columns:1fr 1fr}
  .plans{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  section,.sec-cta{padding:60px 0}
  .nav{flex-wrap:wrap;height:auto;padding:12px 0;gap:10px}
  .nav-links{order:3;width:100%;overflow-x:auto;gap:20px;padding-bottom:2px;white-space:nowrap;font-size:13px}
  .g4,.g3,.g2{grid-template-columns:repeat(2,1fr)}
  .stats{grid-template-columns:repeat(2,1fr)}
  .nlist{grid-template-columns:1fr}
  .rank{grid-auto-flow:row;grid-template-columns:1fr;grid-template-rows:auto;gap:0}
  .reviews{grid-template-columns:1fr 1fr}
  .plans{grid-template-columns:1fr}
  .hero-inner{padding:56px 0 48px}
  .cta{padding:44px 24px}
}
@media(max-width:520px){
  .container{padding:0 16px}
  section,.sec-cta{padding:52px 0}
  .brand-name{font-size:15px}
  .nav-links{display:none}
  .g4,.g3,.g2{grid-template-columns:1fr}
  .scenes{grid-template-columns:1fr}
  .reviews{grid-template-columns:1fr}
  .nitem{grid-template-columns:110px 1fr}
  .nrow{grid-template-columns:96px 1fr}
  .sec-head{flex-direction:column;gap:12px}
  .sec-index{align-self:flex-end}
  .foot-grid{grid-template-columns:1fr}
  .rank .no{font-size:18px}
  .cta-actions .btn{width:100%}
}