/* roulang page: index */
*,*::before,*::after{box-sizing:border-box}
:root{
  --ink-900:#060B14;--ink-800:#0A1526;--ink-700:#0E1E33;
  --glass:rgba(255,255,255,.055);--line:rgba(255,255,255,.10);
  --text-hi:#EAF2FF;--text-mid:#A9BACF;--text-dim:#7A8CA3;
  --gold:#F2A63B;--gold-2:#FF7A47;--cyan:#46E0D2;
  --grad:linear-gradient(135deg,#F2A63B 0%,#FF7A47 100%);
  --r-lg:24px;--r-md:18px;--r-sm:12px;
  --ease:cubic-bezier(.2,.7,.3,1);
  --shadow:0 10px 30px rgba(0,0,0,.45);
}
html{scroll-behavior:smooth}
body{
  margin:0;font-size:15px;line-height:1.75;color:var(--text-mid);
  font-family:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,sans-serif;
  background-color:var(--ink-900);
  background-image:
    radial-gradient(900px 520px at 8% -6%,rgba(242,166,59,.09),transparent 62%),
    radial-gradient(760px 460px at 94% 36%,rgba(70,224,210,.06),transparent 64%),
    radial-gradient(900px 520px at 50% 106%,rgba(242,166,59,.06),transparent 62%);
  background-repeat:no-repeat;
  -webkit-font-smoothing:antialiased;
}
body::before{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:
    repeating-linear-gradient(0deg,rgba(255,255,255,.028) 0 1px,transparent 1px 64px),
    repeating-linear-gradient(90deg,rgba(255,255,255,.028) 0 1px,transparent 1px 64px);
}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none;margin:0;padding:0}
h1,h2,h3,h4,p{margin:0}
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}
main,footer{position:relative;z-index:1}

/* 头部 */
.site-header{position:sticky;top:0;z-index:50}
.nav-main{background:rgba(6,11,20,.78);backdrop-filter:blur(18px) saturate(120%);-webkit-backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;gap:20px;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:700;color:var(--text-hi);white-space:nowrap}
.logo{width:40px;height:40px;border-radius:12px;display:grid;place-items:center;font-size:18px;font-weight:700;color:#171006;background:var(--grad);box-shadow:0 6px 18px rgba(242,166,59,.3)}
.search{display:flex;align-items:center;gap:8px;flex:1;max-width:400px;margin:0 auto;padding:4px 4px 4px 14px;border-radius:999px;background:rgba(255,255,255,.05);border:1px solid var(--line);transition:border-color .2s var(--ease),box-shadow .2s var(--ease)}
.search:focus-within{border-color:var(--gold);box-shadow:0 0 0 3px rgba(242,166,59,.16)}
.search svg{width:18px;height:18px;color:var(--text-dim);flex:none}
.search input{flex:1;min-width:0;border:0;background:transparent;color:var(--text-hi);font-size:14px;padding:8px 0;outline:none}
.search input::placeholder{color:var(--text-dim)}
.search button{flex:none;border:0;cursor:pointer;border-radius:999px;padding:8px 16px;font-size:13px;font-weight:600;color:#171006;background:var(--grad)}
.nav-links{display:flex;align-items:center;gap:16px;margin-left:auto}
.link-plain{font-size:14px;color:var(--text-mid);transition:color .2s var(--ease)}
.link-plain:hover{color:var(--gold)}
.nav-channels{position:relative;background:rgba(6,11,20,.66);backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}
.nav-channels::after{content:"";position:absolute;right:0;top:0;bottom:0;width:40px;pointer-events:none;background:linear-gradient(90deg,transparent,rgba(6,11,20,.92))}
.chan-tabs{display:flex;gap:8px;overflow-x:auto;scrollbar-width:none;padding:8px 0;scroll-snap-type:x proximity}
.chan-tabs::-webkit-scrollbar{display:none}
.tab{flex:none;scroll-snap-align:start;padding:7px 16px;border-radius:999px;font-size:14px;color:var(--text-mid);border:1px solid transparent;white-space:nowrap;transition:color .2s var(--ease),border-color .2s var(--ease),background .2s var(--ease)}
.tab:hover{color:var(--text-hi);background:rgba(255,255,255,.05)}
.tab.is-active{color:var(--gold);background:rgba(255,255,255,.06);border-color:rgba(242,166,59,.55)}

/* 通用 */
main > section{padding:76px 0;border-bottom:1px solid var(--line);scroll-margin-top:130px}
.sec-head{display:flex;align-items:baseline;justify-content:space-between;gap:20px;flex-wrap:wrap;margin-bottom:28px}
h2{font-size:30px;line-height:1.3;font-weight:700;color:var(--text-hi);letter-spacing:-.3px}
.more{font-size:14px;color:var(--text-dim);transition:color .2s var(--ease)}
.more:hover{color:var(--gold)}
.card{background:var(--glass);border:1px solid var(--line);border-radius:var(--r-md);backdrop-filter:blur(14px) saturate(120%);-webkit-backdrop-filter:blur(14px) saturate(120%);box-shadow:var(--shadow);transition:transform .22s var(--ease),border-color .22s var(--ease),box-shadow .22s var(--ease)}
.card:hover{transform:translateY(-4px);border-color:rgba(242,166,59,.55);box-shadow:0 14px 40px rgba(242,166,59,.16)}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:11px 26px;border-radius:999px;font-size:15px;font-weight:600;border:1px solid transparent;cursor:pointer;transition:filter .2s var(--ease),box-shadow .2s var(--ease),border-color .2s var(--ease),background .2s var(--ease)}
.btn-primary{background:var(--grad);color:#171006;box-shadow:0 0 0 1px rgba(242,166,59,.55),0 8px 26px rgba(242,166,59,.32)}
.btn-primary:hover{filter:brightness(1.08);box-shadow:0 0 0 1px rgba(242,166,59,.55),0 12px 34px rgba(242,166,59,.45)}
.btn-ghost{background:rgba(255,255,255,.04);border-color:rgba(255,255,255,.22);color:#E8F1FF}
.btn-ghost:hover{border-color:var(--cyan)}
.btn-sm{padding:8px 18px;font-size:13px;min-height:40px}

/* 01 Hero */
#hero{padding:84px 0 76px}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);gap:44px;align-items:center}
h1{font-size:44px;line-height:1.15;font-weight:700;color:var(--text-hi);letter-spacing:-1px;margin-bottom:14px}
.hl{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;-webkit-text-fill-color:transparent}
.lede{font-size:17px;color:var(--text-hi);margin-bottom:12px}
.desc{max-width:560px;margin-bottom:26px}
.btn-row{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:28px}
.mini-stats{display:flex;flex-wrap:wrap;gap:30px}
.mini-stats li{display:flex;flex-direction:column}
.mini-stats b{font-size:20px;font-weight:700;color:var(--text-hi);font-variant-numeric:tabular-nums;line-height:1.4}
.mini-stats span{font-size:12px;color:var(--text-dim)}
.hero-media{position:relative;border-radius:22px;overflow:hidden;aspect-ratio:16/9;border:1px solid rgba(242,166,59,.35);box-shadow:0 0 44px rgba(242,166,59,.18)}
.hero-media img{width:100%;height:100%;object-fit:cover}
.now-play{position:absolute;right:12px;bottom:12px;display:inline-flex;align-items:center;gap:8px;padding:6px 14px;border-radius:999px;font-size:13px;color:var(--text-hi);background:rgba(6,11,20,.72);border:1px solid var(--line);backdrop-filter:blur(10px)}
.dot{width:7px;height:7px;border-radius:50%;background:var(--cyan);box-shadow:0 0 10px var(--cyan)}

/* 02 痛点 */
.grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}
.pain{position:relative;padding:24px;overflow:hidden}
.pain::before{content:"";position:absolute;left:0;top:20px;bottom:20px;width:2px;border-radius:2px;background:var(--grad);opacity:0;transition:opacity .22s var(--ease)}
.pain:hover::before{opacity:1}
.ic{width:24px;height:24px;display:block;margin-bottom:14px;color:var(--gold);transition:color .22s var(--ease)}
.pain h3{font-size:17px;color:var(--text-hi);margin-bottom:8px}
.pain p{font-size:14px}

/* 03 解决方案 */
.solution{display:grid;grid-template-columns:5fr 7fr;gap:32px;padding:32px;border-radius:var(--r-lg);align-items:center}
.sol-media{border-radius:var(--r-md);overflow:hidden;aspect-ratio:4/3;border:1px solid var(--line);background:var(--ink-700)}
.sol-media img{width:100%;height:100%;object-fit:cover}
.sol-point{display:flex;gap:16px;padding:18px 0;border-bottom:1px solid var(--line)}
.sol-point:first-child{padding-top:0}
.sol-point:last-child{border-bottom:0;padding-bottom:0}
.no{flex:none;font-size:20px;font-weight:700;font-variant-numeric:tabular-nums;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;-webkit-text-fill-color:transparent}
.sol-point h3{font-size:17px;color:var(--text-hi);margin-bottom:6px}
.sol-point p{font-size:14px}

/* 04 视频墙 */
.video-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}
.vcard{display:flex;flex-direction:column;gap:10px;padding:10px}
.vthumb{position:relative;aspect-ratio:16/9;border-radius:var(--r-sm);overflow:hidden;background:var(--ink-700)}
.vthumb img{width:100%;height:100%;object-fit:cover;transition:filter .22s var(--ease)}
.vcard:hover .vthumb img{filter:brightness(.82)}
.dur{position:absolute;right:8px;bottom:8px;padding:2px 8px;border-radius:999px;font-size:11px;color:#EAF2FF;background:rgba(6,11,20,.76);border:1px solid var(--line);font-variant-numeric:tabular-nums}
.play{position:absolute;inset:0;margin:auto;width:46px;height:46px;border-radius:50%;display:grid;place-items:center;background:rgba(6,11,20,.5);border:1px solid rgba(255,255,255,.4);backdrop-filter:blur(6px);opacity:0;transform:translateY(6px);transition:opacity .22s var(--ease),transform .22s var(--ease)}
.vcard:hover .play{opacity:1;transform:none}
.play::after{content:"";width:0;height:0;border-left:12px solid #fff;border-top:7px solid transparent;border-bottom:7px solid transparent;margin-left:3px}
.vtitle{font-size:15px;font-weight:600;line-height:1.45;color:var(--text-hi);display:-webkit-box;-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.vmeta{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--text-dim);font-variant-numeric:tabular-nums}
.vmeta svg{width:14px;height:14px}

/* 05 步骤 */
.steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.step{position:relative;padding:26px 22px}
.step + .step::before{content:"";position:absolute;left:-24px;top:50%;width:24px;border-top:1px dashed var(--line)}
.step-no{font-size:34px;line-height:1;font-weight:700;font-variant-numeric:tabular-nums;margin-bottom:12px;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;-webkit-text-fill-color:transparent}
.step h3{font-size:17px;color:var(--text-hi);margin-bottom:8px}
.step p{font-size:14px}

/* 06 最新上传 */
.latest-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.litem{position:relative;display:grid;grid-template-columns:40% minmax(0,1fr);gap:16px;padding:14px;align-items:center}
.lthumb{aspect-ratio:16/9;border-radius:var(--r-sm);overflow:hidden;background:var(--ink-700)}
.lthumb img{width:100%;height:100%;object-fit:cover}
.ltitle{font-size:15px;font-weight:600;color:var(--text-hi);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.lmeta{display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin-top:6px;font-size:12px;color:var(--text-dim);font-variant-numeric:tabular-nums}
.badge-new{position:absolute;top:8px;right:8px;padding:1px 10px;border-radius:999px;font-size:11px;font-weight:700;color:#171006;background:var(--grad)}
.pill{flex:none;padding:1px 9px;border-radius:999px;font-size:11px;border:1px solid var(--line);color:var(--text-mid)}

/* 07 成果数据 */
.results{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}
.stat{padding:28px 24px}
.stat-num{font-size:46px;line-height:1.1;font-weight:700;font-variant-numeric:tabular-nums;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;-webkit-text-fill-color:transparent}
.stat-lbl{margin-top:6px;font-size:12px;color:var(--text-mid)}

/* 08 分类频道 */
.channels{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:18px}
.chan{position:relative;display:flex;flex-direction:column;gap:10px;padding:26px 20px 20px}
.chan::before{content:"";position:absolute;top:0;left:20px;width:28px;height:3px;border-radius:0 0 3px 3px;background:var(--gold)}
.chan:nth-child(n+2)::before{background:rgba(70,224,210,.75)}
.chan h3{font-size:17px;color:var(--text-hi)}
.chan p{font-size:13px;flex:1}
.arrow{font-size:13px;color:var(--gold);transition:transform .22s var(--ease)}
.chan:hover .arrow{transform:translateX(4px)}

/* 09 排行 */
.rank-wrap{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:40px}
.rank-row{display:flex;align-items:center;gap:12px;min-height:52px;padding:0 8px;border-bottom:1px solid var(--line);transition:background .2s var(--ease)}
.rank-row:hover{background:rgba(255,255,255,.04)}
.rank-no{flex:none;width:34px;font-size:20px;font-weight:700;font-variant-numeric:tabular-nums;color:var(--text-dim)}
.top3{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;-webkit-text-fill-color:transparent}
.rank-name{flex:1;min-width:0;font-size:15px;color:var(--text-hi);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.pill-cyan{color:var(--cyan);border-color:rgba(70,224,210,.42);background:rgba(70,224,210,.07)}
.rank-num{flex:none;width:78px;text-align:right;font-size:13px;color:var(--text-dim);font-variant-numeric:tabular-nums}

/* 10 观众反馈 */
.voices{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
.voice{padding:26px 24px 22px}
.quote{display:block;margin-bottom:4px;font-size:44px;line-height:1;color:rgba(242,166,59,.25);font-family:Georgia,serif}
.voice p{font-size:15px}
.vuser{display:flex;align-items:center;gap:10px;margin-top:18px}
.avatar{width:40px;height:40px;border-radius:50%;object-fit:cover;border:1px solid var(--line)}
.uname{font-size:13px;color:var(--text-hi)}
.utag{margin-left:auto;padding:1px 8px;border-radius:999px;font-size:11px;color:var(--text-dim);border:1px solid var(--line)}

/* 11 适用人群 */
.audience{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:18px}
.aud{padding:24px 18px;text-align:center}
.aud .ic{color:var(--text-mid);margin:0 auto 12px}
.aud:hover .ic{color:var(--gold)}
.aud h3{font-size:16px;color:var(--text-hi);margin-bottom:6px}
.aud p{font-size:13px}

/* 12 合集 */
.collections{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.coll{display:flex;flex-direction:column;gap:12px;padding:12px}
.cthumb{aspect-ratio:4/3;border-radius:var(--r-sm);overflow:hidden;background:var(--ink-700)}
.cthumb img{width:100%;height:100%;object-fit:cover}
.cbody{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:0 4px 4px}
.cbody h3{font-size:15px;font-weight:600;color:var(--text-hi)}
.cn{flex:none;padding:1px 9px;border-radius:999px;font-size:11px;color:var(--gold);border:1px solid rgba(242,166,59,.45);background:rgba(242,166,59,.08);font-variant-numeric:tabular-nums}

/* 13 资讯 */
.news-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0 32px}
.nitem{display:grid;grid-template-columns:96px minmax(0,1fr);gap:14px;align-items:center;padding:12px 8px;border-bottom:1px solid var(--line);transition:background .2s var(--ease)}
.nitem:hover{background:rgba(255,255,255,.04)}
.nthumb{width:96px;height:64px;border-radius:10px;overflow:hidden;background:var(--ink-700)}
.nthumb img{width:100%;height:100%;object-fit:cover}
.ntitle{font-size:14px;color:var(--text-hi);line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.ndate{display:block;margin-top:4px;font-size:13px;color:var(--text-dim);font-variant-numeric:tabular-nums}

/* 14 指标条 */
.metrics-bar{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));padding:20px 24px;border-radius:var(--r-md)}
.metrics-bar li{padding:6px 18px;border-left:1px solid var(--line)}
.metrics-bar li:first-child{border-left:0;padding-left:0}
.mnum{display:block;font-size:22px;font-weight:700;color:var(--text-hi);font-variant-numeric:tabular-nums;line-height:1.4}
.mlbl{font-size:12px;color:var(--text-dim)}

/* 15 FAQ */
.faq{display:grid;gap:12px;max-width:900px}
.faq details{background:var(--glass);border:1px solid var(--line);border-radius:var(--r-md);backdrop-filter:blur(14px) saturate(120%);overflow:hidden;transition:border-color .22s var(--ease)}
.faq details[open]{border-color:rgba(242,166,59,.45)}
.faq summary{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:44px;padding:18px 22px;cursor:pointer;list-style:none;color:var(--text-hi);font-weight:600;transition:color .2s var(--ease)}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";flex:none;font-size:20px;line-height:1;color:var(--gold)}
.faq details[open] summary::after{content:"−"}
.faq details[open] summary{color:var(--gold)}
.faq summary h3{font-size:16px;font-weight:600;margin:0}
.faq p{padding:0 22px 20px;font-size:14px}

/* 16 CTA */
.cta{position:relative;max-width:880px;margin:0 auto;padding:48px 32px;text-align:center;border-radius:var(--r-lg);overflow:hidden}
.cta::after{content:"";position:absolute;left:50%;bottom:-120px;width:520px;height:240px;transform:translateX(-50%);background:radial-gradient(closest-side,rgba(242,166,59,.22),transparent);pointer-events:none}
.cta h2{font-size:28px;margin-bottom:12px}
.cta p{margin-bottom:24px}
.cta .btn-row{justify-content:center;margin-bottom:0}

/* 页脚 */
footer{background:var(--ink-800);border-top:1px solid var(--line)}
.foot{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px;padding:56px 0 32px}
.fbrand{display:flex;align-items:center;gap:10px;margin-bottom:12px;font-size:17px;font-weight:700;color:var(--text-hi)}
.fcol h4{font-size:14px;font-weight:600;color:var(--text-hi);margin-bottom:14px}
.fcol p{font-size:13px;color:var(--text-dim)}
.fcol li{margin-bottom:8px}
.fcol a,.fcol span{font-size:13px;color:var(--text-dim);transition:color .2s var(--ease)}
.fcol a:hover{color:var(--gold)}
.foot-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;padding:18px 0 28px;border-top:1px solid var(--line);font-size:13px;color:var(--text-dim)}

/* 响应式 */
@media (max-width:1024px){
  .hero-grid{grid-template-columns:1fr;gap:32px}
  .search,.link-plain{display:none}
  .grid-4,.results{grid-template-columns:repeat(2,minmax(0,1fr))}
  .video-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .solution{grid-template-columns:1fr;padding:24px}
  .rank-wrap{grid-template-columns:1fr;gap:0}
  .channels{grid-template-columns:repeat(3,minmax(0,1fr))}
  .audience{grid-template-columns:repeat(3,minmax(0,1fr))}
  .collections{grid-template-columns:repeat(2,minmax(0,1fr))}
  .news-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .metrics-bar{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px 0}
  .metrics-bar li{border-left:0;padding:6px 0}
  .foot{grid-template-columns:1fr 1fr}
}
@media (max-width:768px){
  main > section{padding:48px 0}
  h1{font-size:32px;letter-spacing:-.5px}
  h2{font-size:24px}
  .steps{grid-template-columns:1fr;gap:0}
  .step{padding:16px 0 16px 28px;border-left:2px solid var(--line)}
  .step + .step::before{display:none}
  .step::after{content:"";position:absolute;left:-6px;top:28px;width:10px;height:10px;border-radius:50%;background:var(--gold)}
  .latest-grid,.voices,.news-grid{grid-template-columns:1fr}
  .channels,.collections,.audience{grid-template-columns:repeat(2,minmax(0,1fr))}
  .foot{grid-template-columns:1fr;gap:28px;padding:40px 0 24px}
  .cta{padding:36px 22px}
}
@media (max-width:520px){
  .container{padding:0 16px}
  h1{font-size:28px}
  h2{font-size:22px}
  .video-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
  .grid-4,.results,.channels,.audience,.collections,.metrics-bar{grid-template-columns:1fr}
  .metrics-bar{padding:16px}
  .stat-num{font-size:38px}
  .mini-stats{gap:20px}
  .btn-row .btn{flex:1 1 100%}
  .cta .btn-row .btn{flex:1 1 auto}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{transition:none!important;animation:none!important}
  html{scroll-behavior:auto}
  .card:hover{transform:none}
}

/* roulang: framework shim */
/* 覆盖 Bootstrap 等对 a/btn 的全局默认，避免导航出现下划线/蓝链 */
.site-header a,.site-header a:hover,.navbar a,.navbar a:hover,.nav-links a,.nav-links a:hover,header nav a,header nav a:hover{text-decoration:none}
.site-header .btn,.navbar .btn,.nav-cta{text-decoration:none}