/* roulang page: index */
:root{
  --brand:#1D4E89;
  --brand-deep:#143A66;
  --accent:#E4692B;
  --bg:#F6F8FB;
  --surface:#FFFFFF;
  --surface-alt:#F1F5FA;
  --ink:#0F1B2D;
  --ink-2:#5A6B80;
  --line:#E3E9F2;
  --radius:12px;
  --radius-lg:16px;
  --shadow:0 6px 20px rgba(20,58,102,.08);
  --shadow-hover:0 10px 28px rgba(20,58,102,.14);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,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}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
h1,h2,h3,p,ul,figure{margin:0}
ul{padding:0;list-style:none}
h1,h2,h3{line-height:1.3;font-weight:700}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
section{scroll-margin-top:88px}
.section{padding:88px 0}
.section--white{background:var(--surface)}
.section--alt{background:var(--surface-alt)}
.num{font-variant-numeric:tabular-nums}
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:6px}

/* header */
.site-header{position:sticky;top:0;z-index:60;background:var(--bg);transition:background .2s ease-out,box-shadow .2s ease-out}
.site-header.is-stuck{background:#fff;box-shadow:0 1px 0 var(--line),0 6px 18px rgba(20,58,102,.06)}
.header-inner{display:flex;align-items:center;gap:28px;height:72px}
.brand{display:flex;align-items:center;gap:10px;flex:none}
.brand-mark{width:40px;height:40px;border-radius:12px;background:var(--brand);color:#fff;display:grid;place-items:center;font-size:20px;font-weight:700;flex:none}
.brand-name{font-size:18px;font-weight:700;letter-spacing:.01em}
.nav{display:flex;align-items:center;gap:26px;margin-right:auto}
.nav-link{font-size:14.5px;letter-spacing:.02em;color:var(--ink-2);padding:8px 0;border-bottom:2px solid transparent;transition:color .2s,border-color .2s}
.nav-link:hover{color:var(--brand)}
.nav-link.current{color:var(--brand);font-weight:600;border-bottom-color:var(--accent)}
.header-tools{display:flex;align-items:center;gap:12px;margin-left:auto}
.search-box{display:flex;align-items:center;gap:8px;height:44px;padding:0 18px;border-radius:999px;background:var(--surface-alt);border:1px solid var(--line);color:var(--ink-2);font-size:14px;width:210px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:12px 24px;border-radius:999px;font-size:15px;font-weight:600;transition:background .2s ease-out,transform .2s ease-out,color .2s ease-out}
.btn-accent{background:var(--accent);color:#fff}
.btn-accent:hover{background:#CF5A20;transform:translateY(-1px)}
.btn-ghost{color:var(--brand);border:1.5px solid var(--brand);background:transparent}
.btn-ghost:hover{background:rgba(29,78,137,.07)}
.btn-sm{min-height:44px;padding:10px 20px;font-size:14px}
.menu-btn{display:none;width:44px;height:44px;border-radius:10px;border:1px solid var(--line);align-items:center;justify-content:center;color:var(--brand)}
.drawer{position:fixed;inset:0;z-index:80;background:#fff;padding:16px 24px 40px;overflow-y:auto;transform:translateY(-100%);transition:transform .25s ease-out}
.drawer.open{transform:translateY(0)}
.drawer-top{display:flex;align-items:center;justify-content:space-between;height:64px;border-bottom:1px solid var(--line)}
.drawer-top .menu-btn{display:flex}
.drawer-nav a{display:flex;align-items:center;justify-content:space-between;height:56px;font-size:18px;border-bottom:1px solid var(--line);color:var(--ink)}
.drawer-nav span{color:var(--accent);font-size:18px}

/* hero */
.hero{position:relative;padding:72px 0 88px;background:#EAF0F8 url('/assets/images/e7bbc4a0c7bb77c2.jpg') center right/cover no-repeat}
.hero::before{content:"";position:absolute;inset:0;background:linear-gradient(100deg,rgba(246,248,251,.98) 0%,rgba(246,248,251,.94) 46%,rgba(246,248,251,.6) 100%)}
.hero-inner{position:relative;display:grid;grid-template-columns:minmax(0,1.12fr) minmax(0,1fr);gap:56px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--brand);background:#fff;border:1px solid var(--line);border-radius:999px;padding:4px 14px;margin-bottom:18px}
.hero h1{font-size:clamp(30px,5vw,54px);font-weight:800;line-height:1.2;letter-spacing:-.01em}
.hl{color:var(--accent);background:linear-gradient(transparent 68%,rgba(228,105,43,.18) 68%)}
.hero-sub{margin-top:14px;font-size:17px;color:var(--ink-2);font-weight:500}
.hero-desc{margin-top:16px;font-size:15.5px;color:var(--ink-2);max-width:520px}
.check-list{margin-top:22px;display:grid;gap:10px}
.check-list li{display:flex;align-items:flex-start;gap:10px;font-size:14.5px;color:var(--ink)}
.check-list li::before{content:"✓";flex:none;display:grid;place-items:center;width:20px;height:20px;border-radius:50%;background:rgba(29,78,137,.1);color:var(--brand);font-size:12px;font-weight:700;margin-top:3px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
.hero-media{position:relative}
.hero-media img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:var(--radius-lg);box-shadow:var(--shadow)}
.hero-chip{position:absolute;top:16px;left:16px;background:var(--accent);color:#fff;font-size:13px;font-weight:600;padding:4px 12px;border-radius:999px;font-variant-numeric:tabular-nums}
.hero-card{position:absolute;right:14px;bottom:14px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:12px 16px;display:grid;gap:2px}
.hero-card strong{font-size:15px;color:var(--ink)}
.hero-card span{font-size:12.5px;color:var(--ink-2)}

/* section head */
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;flex-wrap:wrap;margin-bottom:40px}
.sec-title{font-size:32px;font-weight:700;line-height:1.3;position:relative;padding-left:16px}
.sec-title::before{content:"";position:absolute;left:0;top:8px;width:4px;height:20px;border-radius:2px;background:var(--accent)}
.sec-desc{margin-top:10px;font-size:15px;color:var(--ink-2);max-width:640px}
.link-text{color:var(--brand);font-size:14.5px;font-weight:600;white-space:nowrap}
.link-text:hover{text-decoration:underline;text-underline-offset:3px}

/* pain cards */
.pain-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}
.pain{background:var(--surface-alt);border:1px solid var(--line);border-radius:var(--radius);padding:24px 20px}
.pain-ico{width:38px;height:38px;border-radius:10px;background:#fff;border:1px solid var(--line);color:var(--brand);display:grid;place-items:center;margin-bottom:14px}
.pain h3{font-size:17px;font-weight:600;margin-bottom:8px}
.pain p{font-size:14px;color:var(--ink-2);line-height:1.7}

/* solve */
.solve{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:64px;align-items:center}
.solve p{margin-top:16px;font-size:15.5px;color:var(--ink-2)}
.solve-list{margin-top:24px;display:grid;gap:12px}
.solve-list li{display:flex;align-items:flex-start;gap:10px;font-size:15px}
.solve-list li::before{content:"✓";flex:none;color:var(--accent);font-weight:700}
.solve-media{position:relative}
.solve-media img{width:100%;aspect-ratio:5/4;object-fit:cover;border-radius:var(--radius-lg);box-shadow:var(--shadow)}
.solve-note{position:absolute;left:-16px;bottom:20px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:14px 18px;max-width:220px}
.solve-note strong{display:block;font-size:14px;color:var(--brand)}
.solve-note span{font-size:13px;color:var(--ink-2)}

/* cards */
.grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;transition:transform .2s ease-out,box-shadow .2s ease-out}
.card:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.card-media{position:relative;overflow:hidden;aspect-ratio:16/9;background:var(--surface-alt)}
.card-media img{width:100%;height:100%;object-fit:cover;transition:transform .2s ease-out}
.card:hover .card-media img{transform:scale(1.03)}
.badge{position:absolute;top:10px;left:10px;font-size:12px;font-weight:600;padding:2px 8px;border-radius:999px;line-height:1.7;white-space:nowrap}
.badge-hd{background:#fff;color:var(--brand);border:1px solid var(--brand)}
.badge-blu{background:var(--brand-deep);color:#fff}
.badge-up{background:#FDEDE3;color:var(--accent)}
.card-body{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:12px 14px}
.card-title{font-size:18px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.card-score{display:inline-flex;align-items:center;gap:3px;flex:none;color:var(--accent);font-size:13px;font-weight:600;font-variant-numeric:tabular-nums}

/* hot */
.hot-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.hot-card.feature{grid-column:span 2;grid-row:span 2}
.hot-card .badge{left:auto;right:10px}
.hot-card.feature .card-media{aspect-ratio:2/1}
.hot-card.feature .card-title{font-size:22px}
.hot-card.feature .card-body{display:block;padding:16px 18px 18px}
.hot-card.feature .card-score{font-size:15px;margin-top:6px}
.hot-intro{margin-top:10px;font-size:14px;color:var(--ink-2);line-height:1.75}
.hot-card .card-body{align-items:center}

/* steps */
.steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px}
.step-num{width:46px;height:46px;border-radius:50%;border:2px solid var(--accent);color:var(--accent);display:grid;place-items:center;font-size:18px;font-weight:700;font-variant-numeric:tabular-nums;margin-bottom:16px;background:#fff}
.step h3{font-size:17px;font-weight:600;margin-bottom:8px}
.step p{font-size:14px;color:var(--ink-2);line-height:1.7}

/* channels */
.chan-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.chan{display:flex;align-items:center;justify-content:space-between;gap:18px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px;transition:transform .2s ease-out,box-shadow .2s ease-out}
.chan:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.chan h3{font-size:17px;font-weight:700;margin-bottom:6px}
.chan p{font-size:13.5px;color:var(--ink-2);line-height:1.7}
.chan-count{display:inline-block;margin-top:10px;font-size:13px;font-weight:600;color:var(--brand);font-variant-numeric:tabular-nums}
.chan-arrow{flex:none;width:34px;height:34px;border-radius:50%;background:var(--surface-alt);color:var(--brand);display:grid;place-items:center;font-size:16px}

/* stats */
.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;background:var(--surface-alt);border:1px solid var(--line);border-radius:var(--radius-lg);padding:38px 32px}
.stat-num{font-size:34px;font-weight:800;color:var(--brand);line-height:1.2;font-variant-numeric:tabular-nums}
.stat-num em{font-size:15px;font-style:normal;font-weight:600;margin-left:4px;color:var(--ink-2)}
.stat-label{margin-top:6px;font-size:13.5px;color:var(--ink-2)}

/* rank */
.rank-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 48px}
.rank-row{display:flex;align-items:center;gap:14px;padding:14px 8px;border-bottom:1px solid var(--line);transition:background .2s}
.rank-row:hover{background:var(--surface-alt)}
.rank-no{width:36px;flex:none;font-weight:700;color:var(--ink-2);font-variant-numeric:tabular-nums}
.rank-no.top{color:var(--accent)}
.rank-title{flex:1;min-width:0;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.rank-tag{flex:none;font-size:12px;color:var(--ink-2);background:var(--surface-alt);border-radius:6px;padding:2px 8px}
.rank-bar{flex:none;width:72px;height:5px;border-radius:999px;background:var(--line);overflow:hidden}
.rank-bar i{display:block;height:100%;background:var(--accent);border-radius:999px}
.rank-score{flex:none;width:44px;text-align:right;color:var(--accent);font-weight:600;font-variant-numeric:tabular-nums}

/* voices */
.voice-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.voice{position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:28px 24px 24px;overflow:hidden}
.voice::before{content:"“";position:absolute;top:2px;right:18px;font-family:Georgia,serif;font-size:60px;line-height:1;color:rgba(228,105,43,.18)}
.voice p{font-size:15px;line-height:1.8}
.voice-user{display:flex;align-items:center;gap:12px;margin-top:20px}
.voice-user img{width:48px;height:48px;border-radius:50%;object-fit:cover;flex:none}
.voice-user strong{display:block;font-size:14px}
.voice-user span{font-size:12.5px;color:var(--ink-2)}

/* who */
.who-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}
.who{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.who h3{font-size:16px;font-weight:600;margin-bottom:8px}
.who p{font-size:13.5px;color:var(--ink-2);line-height:1.7}
.tag-cloud{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}
.tag-cloud span{font-size:13px;color:var(--ink-2);background:#fff;border:1px solid var(--line);border-radius:999px;padding:6px 14px}

/* news */
.news-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 48px}
.news-item{display:flex;gap:16px;padding:18px 0;border-bottom:1px solid var(--line)}
.news-item img{width:112px;height:78px;object-fit:cover;border-radius:8px;flex:none}
.news-item h3{font-size:16px;font-weight:600;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-date{margin-top:8px;font-size:13px;color:var(--ink-2);font-variant-numeric:tabular-nums}

/* meters */
.meter-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.meter{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}
.meter-top{display:flex;align-items:baseline;justify-content:space-between;gap:12px}
.meter-name{font-size:15px;font-weight:600}
.meter-val{font-size:20px;font-weight:700;color:var(--brand);font-variant-numeric:tabular-nums}
.meter-track{height:8px;border-radius:999px;background:var(--surface-alt);overflow:hidden;margin-top:14px}
.meter-track i{display:block;height:100%;border-radius:999px;background:var(--brand)}
.meter p{margin-top:12px;font-size:13.5px;color:var(--ink-2)}

/* faq */
.faq-wrap{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.6fr);gap:56px}
.faq-wrap .sec-desc{max-width:320px}
.faq details{border-bottom:1px solid var(--line);padding:18px 0}
.faq summary{display:flex;align-items:center;justify-content:space-between;gap:18px;font-size:16px;font-weight:600;cursor:pointer;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"⌄";flex:none;color:var(--brand);font-size:20px;line-height:1;transition:transform .2s ease-out}
.faq details[open] summary::after{transform:rotate(180deg)}
.faq details p{margin-top:12px;font-size:15px;line-height:1.75;color:var(--ink-2)}

/* cta */
.cta-box{background:var(--brand-deep);border-radius:var(--radius-lg);padding:64px 32px;text-align:center;color:#fff}
.cta-box h2{font-size:clamp(24px,4vw,34px);color:#fff}
.cta-box p{margin-top:14px;font-size:15.5px;color:rgba(255,255,255,.82)}
.cta-box .btn{margin-top:28px}
.cta-tip{margin-top:16px;font-size:12.5px;color:rgba(255,255,255,.62)}

/* footer */
.site-footer{background:var(--brand-deep);color:rgba(255,255,255,.8);padding:64px 0 28px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px}
.footer-brand .brand-name{color:#fff}
.footer-brand p{margin-top:16px;font-size:13.5px;line-height:1.8;color:rgba(255,255,255,.68);max-width:320px}
.footer-logo{display:flex;align-items:center;gap:10px}
.footer-logo .brand-mark{background:#fff;color:var(--brand-deep)}
.footer-col h4{margin:0 0 14px;font-size:14px;font-weight:600;color:#fff}
.footer-col a{display:block;font-size:13.5px;padding:5px 0;color:rgba(255,255,255,.7);transition:color .2s}
.footer-col a:hover{color:#fff}
.footer-bottom{margin-top:44px;padding-top:20px;border-top:1px solid rgba(255,255,255,.14);font-size:12.5px;color:rgba(255,255,255,.55)}

@media (max-width:1024px){
  .container{padding:0 20px}
  .section{padding:72px 0}
  .nav{display:none}
  .menu-btn{display:flex}
  .hero{padding:56px 0 64px}
  .hero-inner{grid-template-columns:1fr;gap:36px}
  .grid-4{grid-template-columns:repeat(3,minmax(0,1fr))}
  .pain-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .solve{grid-template-columns:1fr;gap:36px}
  .solve-note{left:14px;bottom:14px}
  .chan-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .who-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .faq-wrap{grid-template-columns:1fr;gap:24px}
  .faq-wrap .sec-desc{max-width:640px}
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr;gap:32px}
}
@media (max-width:768px){
  .section{padding:56px 0}
  .sec-title{font-size:26px}
  .sec-head{margin-bottom:28px}
  .grid-4{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
  .card-title{font-size:15px}
  .card-body{padding:10px 12px}
  .hot-grid{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;gap:14px;padding:0 20px 12px;margin:0 -20px}
  .hot-card{flex:0 0 68%;scroll-snap-align:start}
  .hot-card.feature{grid-column:auto;grid-row:auto;flex:0 0 68%}
  .hot-card.feature .card-media{aspect-ratio:16/9}
  .hot-card.feature .card-title{font-size:18px}
  .steps{display:block}
  .step{position:relative;padding:0 0 28px 38px}
  .step:last-child{padding-bottom:0}
  .step::before{content:"";position:absolute;left:14px;top:46px;bottom:0;width:1px;background:var(--line)}
  .step:last-child::before{display:none}
  .step-num{position:absolute;left:0;top:0;width:30px;height:30px;font-size:14px;margin:0}
  .steps .step h3{margin-bottom:6px}
  .chan-grid{grid-template-columns:1fr}
  .rank-grid{grid-template-columns:1fr;gap:0}
  .rank-bar{display:none}
  .voice-grid{grid-template-columns:1fr}
  .news-grid{grid-template-columns:1fr}
  .meter-grid{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,minmax(0,1fr));padding:28px 22px;gap:20px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .cta-box{padding:44px 22px}
  .search-box{display:none}
}
@media (max-width:520px){
  .container{padding:0 16px}
  .section{padding:44px 0}
  .header-inner{height:60px;gap:12px}
  .brand-mark{width:34px;height:34px;border-radius:10px;font-size:17px}
  .brand-name{font-size:16px}
  .hero{padding:44px 0 52px}
  .hero-actions .btn{flex:1 1 100%}
  .pain-grid{grid-template-columns:1fr}
  .who-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
  .who{padding:16px}
  .who h3{font-size:15px}
  .who p{font-size:13px}
  .grid-4{gap:12px}
  .stat-num{font-size:26px}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{margin-top:28px}
  .rank-tag{display:none}
  .news-item img{width:88px;height:66px}
}