/* roulang page: index */
:root{
  --paper:#F3EFE4;
  --paper2:#EAE4D4;
  --card:#FFFDF7;
  --ink:#15181B;
  --muted:#6F7477;
  --panel:#23282D;
  --deep:#15181B;
  --line:#D9D2C2;
  --line-d:rgba(255,255,255,.14);
  --orange:#FF6B2C;
  --lime:#C9FF4D;
  --r:5px;
  --r-sm:3px;
  --shadow:0 14px 34px rgba(21,24,27,.12);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;font-size:16px;line-height:1.8;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3{margin:0;line-height:1.22;font-weight:800;letter-spacing:.01em}
p{margin:0}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--lime);outline-offset:2px}
.wrap{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}

/* header */
.site-header{position:sticky;top:0;z-index:60;background:rgba(35,40,45,.97);border-bottom:1px solid var(--line-d)}
.hd{position:relative;display:flex;align-items:center;gap:28px;height:68px}
.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.brand-mark{width:32px;height:32px;display:grid;place-items:center;background:var(--orange);border-radius:var(--r-sm)}
.brand-mark svg{width:20px;height:20px}
.brand-name{font-size:18px;font-weight:800;color:#F3EFE4;letter-spacing:.02em}
.nav{margin-left:auto}
.nav-list{display:flex;gap:2px}
.nav-list a{display:block;padding:9px 12px;font-size:15px;color:#D6D1C5;border-bottom:2px solid transparent;transition:color .18s,border-color .18s}
.nav-list a:hover{color:#fff;border-bottom-color:var(--orange)}
.nav-check{display:none}
.nav-btn{display:none;margin-left:auto;width:44px;height:44px;flex-direction:column;justify-content:center;gap:5px;cursor:pointer;border:1px solid var(--line-d);border-radius:var(--r-sm)}
.nav-btn span{display:block;height:2px;margin:0 10px;background:#F3EFE4}

/* hero */
.hero{position:relative;overflow:hidden;padding:76px 0 84px;color:#F1EDE3;background:linear-gradient(rgba(21,24,27,.93),rgba(21,24,27,.97)),url('/assets/images/af37e49391d0440c.jpg') center/cover no-repeat}
.hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);background-size:46px 46px;pointer-events:none}
.hero .wrap{position:relative;z-index:1}
.hero-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:56px;align-items:center}
.eyebrow{display:flex;align-items:center;gap:10px;font-size:13px;font-weight:700;letter-spacing:.14em;color:var(--muted);margin-bottom:12px}
.eyebrow i{display:block;width:36px;height:2px;background:var(--orange)}
.eyebrow-num{color:var(--orange);font-weight:800}
.eyebrow.on-dark{color:#9EA5AB}
.hero h1{font-size:58px;line-height:1.15;letter-spacing:.015em;margin:16px 0 18px}
.hl{color:var(--orange)}
.hero-sub{font-size:19px;line-height:1.7;color:#E9E4D8;font-weight:500;margin-bottom:14px}
.hero-desc{font-size:16px;line-height:1.85;color:#B6B1A5;max-width:520px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 22px;border:2px solid transparent;border-radius:var(--r);font-size:15px;font-weight:700;cursor:pointer;transition:transform .18s,background-color .18s,color .18s,border-color .18s}
.btn-primary{background:var(--orange);border-color:var(--orange);color:#15181B}
.btn-primary:hover{background:var(--ink);border-color:var(--orange);color:var(--orange);transform:translateY(-2px)}
.btn-ghost{background:transparent;border-color:rgba(255,255,255,.42);color:#F1EDE3}
.btn-ghost:hover{border-color:var(--orange);color:var(--orange);transform:translateY(-2px)}
.hero-visual{position:relative;margin:0;border:1px solid var(--line-d);border-radius:var(--r);overflow:hidden;background:#1a1e22;box-shadow:4px 4px 0 rgba(21,24,27,.5)}
.hero-visual img{width:100%;aspect-ratio:16/9;object-fit:cover}
.hero-visual::before,.hero-visual::after{content:"";position:absolute;width:18px;height:18px;border:2px solid var(--lime);opacity:.85}
.hero-visual::before{top:10px;left:10px;border-right:0;border-bottom:0}
.hero-visual::after{bottom:10px;right:10px;border-left:0;border-top:0}
.hero-play{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:64px;height:64px;border-radius:50%;border:2px solid rgba(255,255,255,.82);background:rgba(21,24,27,.45);display:grid;place-items:center}
.hero-play::after{content:"";width:0;height:0;border-left:15px solid #fff;border-top:9px solid transparent;border-bottom:9px solid transparent;margin-left:4px}
.hero-time{position:absolute;top:12px;right:12px;height:24px;display:inline-flex;align-items:center;padding:0 8px;background:rgba(21,24,27,.85);color:#fff;font-size:12px;border-radius:var(--r-sm);font-variant-numeric:tabular-nums}
.hero-bar{position:absolute;left:0;right:0;bottom:0;height:4px;background:rgba(255,255,255,.18)}
.hero-bar span{display:block;width:62%;height:100%;background:var(--orange)}

/* sections */
.sec{padding:88px 0}
.sec-alt{background:var(--paper2)}
.sec-head{margin-bottom:40px}
.sec h2{font-size:32px}
.sec-note{margin-top:12px;max-width:660px;color:var(--muted);font-size:16px}

/* metrics */
.metrics{display:grid;grid-template-columns:repeat(5,1fr);gap:20px}
.metric{position:relative;overflow:hidden;background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:20px;box-shadow:0 6px 18px rgba(21,24,27,.06)}
.metric-no{font-size:12px;font-weight:800;color:var(--orange);letter-spacing:.08em}
.metric-val{display:block;font-size:34px;font-weight:800;line-height:1.1;margin:10px 0 4px;font-variant-numeric:tabular-nums}
.metric-label{font-size:13.5px;color:var(--muted)}
.metric::after{content:"";position:absolute;right:16px;bottom:16px;width:20px;height:3px;background:var(--lime)}

/* video grid */
.vid-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.vid{background:var(--card);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;padding-bottom:14px;transition:transform .2s,border-color .2s,box-shadow .2s}
.vid:hover{transform:translateY(-4px);border-color:var(--orange);box-shadow:var(--shadow)}
.vid-cover{position:relative;margin:0;aspect-ratio:16/9;overflow:hidden;background:#2a2f34}
.vid-cover img{width:100%;height:100%;object-fit:cover;transition:transform .3s}
.vid:hover .vid-cover img{transform:scale(1.03)}
.tag-time{position:absolute;left:8px;bottom:8px;height:22px;display:inline-flex;align-items:center;padding:0 7px;background:rgba(21,24,27,.84);color:#fff;font-size:12px;border-radius:var(--r-sm);font-variant-numeric:tabular-nums}
.tag-cat{position:absolute;right:8px;top:8px;height:22px;display:inline-flex;align-items:center;padding:0 7px;background:var(--lime);color:#15181B;font-size:12px;font-weight:700;border-radius:var(--r-sm)}
.vid-title{margin:12px 14px 0;font-size:16px;line-height:1.45;font-weight:700;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.vid-title a:hover{color:var(--orange)}
.vid-meta{margin:6px 14px 0;font-size:13px;color:var(--muted);transition:color .2s}
.vid:hover .vid-meta{color:var(--ink)}

/* new uploads */
.new-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.new-card{display:grid;grid-template-columns:150px 1fr;background:var(--card);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;transition:transform .2s,border-color .2s,box-shadow .2s}
.new-card:hover{transform:translateY(-4px);border-color:var(--orange);box-shadow:var(--shadow)}
.new-fig{margin:0;overflow:hidden;background:#2a2f34}
.new-fig img{width:100%;height:100%;object-fit:cover}
.new-body{padding:14px 16px;display:flex;flex-direction:column;gap:6px;justify-content:center}
.chip{align-self:flex-start;font-size:12px;font-weight:700;padding:1px 7px;border-radius:var(--r-sm);background:rgba(255,107,44,.14);color:#C24A16;border:1px solid rgba(255,107,44,.4)}
.new-title{font-size:16px;line-height:1.4;font-weight:700;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.new-title a:hover{color:var(--orange)}
.new-meta{font-size:13px;color:var(--muted)}

/* categories */
.cat-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:20px}
.cat{position:relative;display:flex;flex-direction:column;gap:10px;background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:24px 20px 20px;transition:transform .2s,border-color .2s,box-shadow .2s}
.cat:hover{transform:translateY(-4px);border-color:var(--orange);box-shadow:var(--shadow)}
.cat::after{content:"";position:absolute;top:22px;right:20px;width:10px;height:10px;background:var(--lime);border-radius:50% 50% 50% 0;transform:rotate(45deg)}
.cat-no{font-size:12px;font-weight:800;color:var(--orange);letter-spacing:.08em}
.cat h3{font-size:18px}
.cat p{font-size:14px;line-height:1.75;color:var(--muted);flex:1}
.cat-more{align-self:flex-start;font-size:14px;font-weight:700;padding-bottom:2px;border-bottom:2px solid var(--orange)}
.cat-more:hover{color:var(--orange)}
.cat-all{margin-top:28px;font-size:14px;font-weight:700;color:var(--ink);border-bottom:2px solid var(--orange);display:inline-block;padding-bottom:2px}

/* ranking */
.rank-grid{display:grid;grid-template-rows:repeat(5,auto);grid-auto-flow:column;gap:0 44px}
.rank-item{display:flex;align-items:center;gap:14px;padding:12px 4px;border-bottom:1px solid var(--line)}
.rank-no{flex:0 0 auto;width:32px;font-size:18px;font-weight:800;color:var(--muted);font-variant-numeric:tabular-nums}
.rank-title{flex:1;min-width:0;font-size:16px;font-weight:700;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.rank-title:hover{color:var(--orange)}
.rank-item.top{border-left:3px solid var(--orange);padding-left:12px;border-bottom-color:#C9C0AB}
.rank-item.top .rank-no{width:44px;font-size:26px;color:var(--orange);line-height:1.1}
.rank-cat{flex:0 0 auto;font-size:12px;color:var(--muted);border:1px solid var(--line);border-radius:var(--r-sm);padding:0 6px;line-height:20px}
.rank-num{flex:0 0 auto;min-width:70px;text-align:right;font-size:13px;color:var(--muted);font-variant-numeric:tabular-nums}
.rank-item.top .rank-num{color:var(--ink);font-weight:700}

/* compare table */
.cmp-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:var(--card);box-shadow:0 6px 18px rgba(21,24,27,.06)}
.cmp{width:100%;min-width:700px;border-collapse:collapse;font-size:14.5px}
.cmp th,.cmp td{padding:15px 18px;text-align:left;border-bottom:1px solid var(--line);vertical-align:middle}
.cmp thead th{background:var(--panel);color:#F1EDE3;font-size:13.5px;font-weight:700;letter-spacing:.05em;border-bottom:0}
.cmp tbody th{background:#F7F3E8;font-weight:700;white-space:nowrap}
.cmp tbody tr:last-child th,.cmp tbody tr:last-child td{border-bottom:0}
.cmp td{color:var(--muted)}
.cmp .lv-high{color:var(--ink);font-weight:700}
.cmp .lv-mid{color:var(--muted)}
.cmp-foot{margin-top:18px;font-size:14px;color:var(--muted);max-width:760px}

/* timeline */
.tl{position:relative;display:grid;grid-template-columns:repeat(5,1fr);gap:24px;padding-top:32px}
.tl::before{content:"";position:absolute;top:9px;left:8px;right:8px;border-top:2px dashed #C6BDA9}
.tl-item{position:relative}
.tl-dot{position:absolute;top:-31px;left:0;width:18px;height:18px;background:var(--card);border:2px solid var(--orange);border-radius:50% 50% 50% 0;transform:rotate(45deg)}
.tl-dot::after{content:"";position:absolute;inset:4px;border-radius:50%;background:var(--lime)}
.tl-no{font-size:12px;font-weight:800;color:var(--orange);letter-spacing:.08em}
.tl-item h3{font-size:17px;margin:6px 0 8px}
.tl-item p{font-size:14px;line-height:1.75;color:var(--muted)}

/* news */
.news-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.news-item{display:grid;grid-template-columns:150px 1fr;gap:16px;align-items:center;padding:12px;background:var(--card);border:1px solid var(--line);border-radius:var(--r);transition:transform .2s,border-color .2s,box-shadow .2s}
.news-item:hover{transform:translateY(-4px);border-color:var(--orange);box-shadow:var(--shadow)}
.news-fig{margin:0;aspect-ratio:4/3;overflow:hidden;border-radius:var(--r-sm);background:#2a2f34}
.news-fig img{width:100%;height:100%;object-fit:cover}
.news-title{font-size:16px;line-height:1.45;font-weight:700;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-title a:hover{color:var(--orange)}
.news-date{margin-top:8px;font-size:13px;color:var(--muted);font-variant-numeric:tabular-nums}

/* guarantee */
.guard-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.guard{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:24px 20px;transition:transform .2s,border-color .2s}
.guard:hover{transform:translateY(-4px);border-color:var(--orange)}
.guard-ico{width:44px;height:44px;display:grid;place-items:center;background:rgba(201,255,77,.35);border-radius:var(--r-sm);margin-bottom:14px}
.guard-ico svg{width:22px;height:22px;stroke:#15181B;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.guard h3{font-size:17px;margin-bottom:8px}
.guard p{font-size:14px;line-height:1.75;color:var(--muted)}

/* steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.step{background:var(--card);border:1px solid var(--line);border-top:3px solid var(--orange);border-radius:var(--r);padding:20px}
.step-no{font-size:12px;font-weight:800;color:var(--orange);letter-spacing:.08em}
.step h3{font-size:17px;margin:8px 0 8px}
.step p{font-size:14px;line-height:1.75;color:var(--muted)}

/* faq */
.faq{max-width:920px}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:var(--r);margin-bottom:12px;overflow:hidden}
.faq summary{display:flex;align-items:center;gap:12px;min-height:48px;padding:16px 20px;font-size:16.5px;font-weight:700;cursor:pointer;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";margin-left:auto;font-size:20px;font-weight:400;color:var(--orange)}
.faq details[open] summary::after{content:"−"}
.faq-q-no{font-size:13px;font-weight:800;color:var(--orange);letter-spacing:.06em}
.faq details[open] summary{border-bottom:1px solid var(--line)}
.faq-a{padding:16px 20px 20px 52px;font-size:15px;line-height:1.85;color:var(--muted)}

/* subscribe */
.sub-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:start}
.sub-copy h2{font-size:32px;margin-bottom:16px}
.sub-copy p{color:var(--muted);margin-bottom:10px;font-size:15.5px}
.sub-list li{position:relative;padding-left:18px;font-size:15.5px;color:var(--muted);margin-bottom:8px}
.sub-list li::before{content:"";position:absolute;left:0;top:11px;width:7px;height:7px;background:var(--lime);border:1px solid #A8DE2C;border-radius:50% 50% 50% 0;transform:rotate(45deg)}
.form-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:28px;box-shadow:0 6px 18px rgba(21,24,27,.06)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:16px}
.field label{font-size:13.5px;font-weight:700;color:var(--muted)}
.field input,.field select,.field textarea{width:100%;min-height:46px;padding:10px 12px;background:#FFFDF7;border:2px solid var(--line);border-radius:var(--r);font-size:15px;transition:border-color .18s,box-shadow .18s}
.field textarea{min-height:94px;resize:vertical;line-height:1.7}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--orange);box-shadow:0 0 0 3px rgba(201,255,77,.65)}
.form-note{font-size:13px;color:var(--muted);margin-top:12px}
.form-card .btn{width:100%;margin-top:4px}

/* footer */
.site-footer{background:var(--deep);color:#B4AFA3;padding:64px 0 0}
.ft-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px}
.ft-brand{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.ft-brand .brand-mark{background:var(--orange)}
.ft-brand span{font-size:17px;font-weight:800;color:#F1EDE3}
.ft-desc{font-size:14px;line-height:1.8;max-width:300px}
.ft-title{font-size:15px;font-weight:700;color:#F1EDE3;margin-bottom:14px}
.ft-list li{margin-bottom:9px;font-size:14px}
.ft-list a{transition:color .18s}
.ft-list a:hover{color:var(--orange)}
.ft-bottom{margin-top:48px;border-top:1px solid var(--line-d);padding:20px 0;display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;font-size:13px;color:#8B877D}

@media(max-width:1024px){
  .hd{height:64px}
  .nav-btn{display:flex}
  .nav{position:absolute;left:-24px;right:-24px;top:64px;margin:0;background:var(--panel);border-bottom:1px solid var(--line-d);display:none}
  .nav-check:checked ~ .nav{display:block}
  .nav-list{flex-direction:column;gap:0;padding:6px 0}
  .nav-list a{padding:14px 24px;border-bottom:1px solid var(--line-d)}
  .hero{padding:56px 0 64px}
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .hero h1{font-size:46px}
  .sec{padding:64px 0}
  .sec h2{font-size:28px}
  .metrics{grid-template-columns:repeat(3,1fr)}
  .vid-grid{grid-template-columns:repeat(3,1fr);gap:20px}
  .cat-grid{grid-template-columns:repeat(3,1fr)}
  .guard-grid{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .tl{grid-template-columns:repeat(3,1fr);row-gap:34px;padding-top:32px}
  .tl::before{display:none}
  .tl-dot{position:static;margin-bottom:14px;transform:rotate(45deg)}
  .sub-grid{grid-template-columns:1fr;gap:32px}
  .ft-grid{grid-template-columns:1fr 1fr;gap:32px}
}
@media(max-width:768px){
  .wrap{padding:0 18px}
  .nav{left:-18px;right:-18px}
  .hero h1{font-size:38px}
  .hero-sub{font-size:17px}
  .sec{padding:52px 0}
  .sec h2{font-size:25px}
  .metrics{grid-template-columns:repeat(2,1fr)}
  .vid-grid{grid-template-columns:repeat(2,1fr);gap:16px}
  .new-grid{grid-template-columns:1fr}
  .cat-grid{grid-template-columns:repeat(2,1fr)}
  .rank-grid{grid-template-rows:none;grid-auto-flow:row;gap:0}
  .news-grid{grid-template-columns:1fr}
  .guard-grid{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  .tl{grid-template-columns:1fr;gap:26px}
  .sub-copy h2{font-size:25px}
  .form-card{padding:20px}
  .form-row{grid-template-columns:1fr}
}
@media(max-width:520px){
  .brand-name{font-size:16px}
  .hero{padding:44px 0 52px}
  .hero h1{font-size:34px}
  .hero-actions .btn{flex:1 1 100%}
  .metrics{gap:12px}
  .metric{padding:16px}
  .metric-val{font-size:28px}
  .vid-grid{grid-template-columns:repeat(2,1fr);gap:12px}
  .new-card{grid-template-columns:104px 1fr}
  .new-body{padding:12px}
  .cat-grid{grid-template-columns:1fr}
  .news-item{grid-template-columns:104px 1fr;padding:10px;gap:12px}
  .rank-item{gap:10px;padding:11px 2px}
  .rank-item.top{padding-left:10px}
  .rank-num{min-width:60px;font-size:12px}
  .faq-a{padding:14px 16px 18px}
  .ft-grid{grid-template-columns:1fr;gap:26px}
}