/* roulang page: index */
:root{
      --ink:#202221;
      --charcoal:#2d302f;
      --paper:#fffdf9;
      --mist:#f3f4f0;
      --line:#dedfd9;
      --muted:#69706b;
      --coral:#e85d45;
      --coral-dark:#c94735;
      --teal:#4f8f88;
      --teal-pale:#e2efeb;
      --shadow:0 10px 24px rgba(31,35,32,.08);
      --radius:7px;
      --container:1280px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      color:var(--ink);
      background:var(--paper);
      font:15px/1.7 "PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
    }
    a{color:inherit;text-decoration:none}
    img{display:block;width:100%;height:auto}
    button,input{font:inherit}
    button{cursor:pointer}
    :focus-visible{outline:3px solid rgba(232,93,69,.45);outline-offset:3px}
    .container{width:min(calc(100% - 48px),var(--container));margin:auto}
    .site-header{
      position:sticky;top:0;z-index:30;
      background:rgba(255,253,249,.96);
      border-bottom:1px solid rgba(32,34,33,.11);
      backdrop-filter:blur(10px);
    }
    .nav-wrap{min-height:68px;display:flex;align-items:center;gap:28px}
    .brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;font-size:18px;font-weight:800}
    .brand-mark{
      display:grid;place-items:center;width:34px;height:34px;color:#fff;background:var(--coral);
      border-radius:6px;font-size:14px;line-height:1;
    }
    .site-nav{display:flex;align-items:center;gap:6px;margin-left:auto}
    .site-nav a{padding:10px 13px;color:#454a46;font-weight:600;border-radius:5px}
    .site-nav a:hover,.site-nav a.active{color:var(--coral);background:#fff0eb}
    .search{display:flex;align-items:center;border:1px solid var(--line);border-radius:6px;background:#fff;overflow:hidden}
    .search input{width:126px;border:0;padding:8px 10px;outline:0;background:transparent}
    .search button{width:38px;height:36px;border:0;background:transparent;color:var(--muted);font-size:18px}
    .menu-toggle{display:none;width:44px;height:44px;margin-left:auto;border:1px solid var(--line);border-radius:6px;background:#fff;color:var(--ink);font-size:20px}
    .hero{
      position:relative;min-height:600px;display:flex;align-items:center;color:#fff;overflow:hidden;
      background:linear-gradient(90deg,rgba(20,23,22,.84) 0%,rgba(20,23,22,.62) 48%,rgba(20,23,22,.28) 100%),url('/assets/images/e3110c98f442aecb.jpg') center/cover no-repeat;
    }
    .hero::after{content:"";position:absolute;right:5%;bottom:38px;width:78px;height:48px;border:1px solid rgba(255,255,255,.62);border-radius:5px}
    .hero .container{position:relative;z-index:1;padding:80px 0 110px}
    .hero-kicker{display:inline-flex;align-items:center;gap:9px;margin:0 0 16px;color:#ffd7ce;font-size:13px;font-weight:700}
    .hero-kicker::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--coral)}
    h1,h2,h3,p{margin-top:0}
    h1{max-width:760px;margin-bottom:18px;font-size:48px;line-height:1.18;font-weight:800}
    h1 strong{color:#ff9d89;font-weight:800}
    .hero-sub{margin:0 0 14px;font-size:20px;font-weight:700}
    .hero-copy{max-width:745px;margin-bottom:26px;color:rgba(255,255,255,.88);font-size:16px;line-height:1.9}
    .hero-actions{display:flex;gap:12px;flex-wrap:wrap}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:10px 19px;
      border:1px solid transparent;border-radius:6px;font-weight:700;transition:.2s ease;
    }
    .btn-primary{background:var(--coral);color:#fff}
    .btn-primary:hover{background:var(--coral-dark);color:#fff;transform:translateY(-2px)}
    .btn-outline{border-color:rgba(255,255,255,.72);color:#fff;background:rgba(255,255,255,.06)}
    .btn-outline:hover{background:#fff;color:var(--ink)}
    .hero-meta{position:absolute;bottom:33px;left:0;display:flex;gap:10px;font-size:13px;color:#f5f5f3}
    .hero-meta span{padding:4px 9px;border:1px solid rgba(255,255,255,.35);border-radius:4px;background:rgba(0,0,0,.2)}
    section{padding:84px 0;scroll-margin-top:68px}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:30px}
    .eyebrow{margin-bottom:7px;color:var(--teal);font-size:13px;font-weight:800}
    h2{margin-bottom:0;font-size:29px;line-height:1.32;font-weight:800}
    .section-intro{max-width:610px;margin:12px 0 0;color:var(--muted)}
    .text-link{color:var(--coral);font-weight:700;white-space:nowrap}
    .text-link:hover{color:var(--coral-dark)}
    .discover{background:var(--mist)}
    .benefit-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
    .benefit{padding:28px 28px 26px;border-right:1px solid var(--line)}
    .benefit:last-child{border-right:0}
    .benefit-icon{display:grid;place-items:center;width:39px;height:39px;margin-bottom:16px;border-radius:6px;background:var(--teal-pale);color:var(--teal);font-size:20px;font-weight:800}
    .benefit h3{margin-bottom:8px;font-size:18px;font-weight:800}
    .benefit p{margin-bottom:0;color:var(--muted)}
    .video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
    .video-card{overflow:hidden;border:1px solid var(--line);border-radius:var(--radius);background:#fff;box-shadow:0 2px 7px rgba(31,35,32,.04);transition:.2s ease}
    .video-card:hover{border-color:rgba(232,93,69,.5);box-shadow:var(--shadow);transform:translateY(-3px)}
    .cover{position:relative;overflow:hidden;aspect-ratio:16/9;background:#d9ddd7}
    .cover img{height:100%;object-fit:cover;transition:.25s ease}
    .video-card:hover .cover img{transform:scale(1.04)}
    .play{position:absolute;left:10px;bottom:9px;display:grid;place-items:center;width:27px;height:27px;border-radius:50%;background:rgba(24,26,25,.78);color:#fff;font-size:11px}
    .duration{position:absolute;right:8px;bottom:8px;padding:2px 6px;border-radius:3px;background:rgba(24,26,25,.8);color:#fff;font-size:12px}
    .card-info{padding:12px 13px 14px}
    .card-info h3{overflow:hidden;margin-bottom:7px;font-size:16px;line-height:1.4;white-space:nowrap;text-overflow:ellipsis}
    .card-meta{display:flex;align-items:center;justify-content:space-between;gap:8px;color:var(--muted);font-size:12px}
    .tag{display:inline-block;padding:2px 7px;border-radius:3px;background:var(--teal-pale);color:#34746d;font-size:11px;font-weight:700}
    .latest{background:#fbfaf7}
    .latest-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .latest-item{display:grid;grid-template-columns:132px 1fr;gap:14px;align-items:center;padding:12px;border-bottom:1px solid var(--line)}
    .latest-item:nth-last-child(-n+3){border-bottom:0}
    .latest-thumb{aspect-ratio:16/10;overflow:hidden;border-radius:5px;background:#ddd}
    .latest-thumb img{height:100%;object-fit:cover}
    .latest-item h3{margin-bottom:4px;font-size:16px;line-height:1.4}
    .latest-item p{margin-bottom:6px;color:var(--muted);font-size:13px;line-height:1.55}
    .latest-meta{display:flex;gap:8px;align-items:center;color:var(--muted);font-size:12px}
    .new{color:var(--coral);font-weight:800}
    .categories{background:var(--charcoal);color:#fff}
    .categories .eyebrow{color:#8cc2ba}
    .categories .section-intro{color:#d1d4d0}
    .category-grid{display:grid;grid-template-columns:1.2fr .8fr 1fr;gap:16px}
    .category{
      min-height:176px;padding:24px;border:1px solid rgba(255,255,255,.18);border-radius:var(--radius);
      background:rgba(255,255,255,.035);transition:.2s ease;
    }
    .category:nth-child(2),.category:nth-child(5){background:rgba(79,143,136,.18)}
    .category:nth-child(3){background:rgba(232,93,69,.16)}
    .category:hover{border-color:rgba(255,157,137,.8);transform:translateY(-3px)}
    .category-num{display:block;margin-bottom:26px;color:#a8aeaa;font-size:12px;font-weight:700}
    .category h3{margin-bottom:8px;font-size:21px}
    .category p{margin-bottom:0;color:#d7dad7;font-size:14px}
    .ranking{background:var(--mist)}
    .rank-layout{display:grid;grid-template-columns:1.05fr .95fr;gap:46px}
    .rank-top{border-top:2px solid var(--ink)}
    .rank-main{display:grid;grid-template-columns:56px 1fr auto;gap:15px;align-items:center;padding:18px 0;border-bottom:1px solid var(--line)}
    .rank-no{font-size:27px;font-weight:800;line-height:1}
    .rank-main:nth-child(1) .rank-no{color:var(--coral)}
    .rank-main:nth-child(2) .rank-no{color:var(--teal)}
    .rank-main:nth-child(3) .rank-no{color:#565c58}
    .rank-title{font-size:18px;font-weight:800}
    .rank-sub{color:var(--muted);font-size:12px}
    .rank-heat{color:var(--coral);font-weight:800;font-size:14px}
    .rank-list{margin:0;padding:0;list-style:none;border-top:1px solid var(--line)}
    .rank-list li{display:grid;grid-template-columns:32px 1fr auto;gap:10px;align-items:center;padding:13px 0;border-bottom:1px solid var(--line)}
    .rank-list b{font-size:16px}
    .rank-list span{overflow:hidden;font-weight:700;white-space:nowrap;text-overflow:ellipsis}
    .rank-list small{color:var(--muted)}
    .feedback-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
    .feedback-item{padding:5px 0 5px 20px;border-left:3px solid var(--teal)}
    .feedback-item blockquote{margin:0 0 18px;font-size:17px;line-height:1.8}
    .viewer{display:flex;align-items:center;gap:10px}
    .avatar{width:34px;height:34px;border-radius:50%;object-fit:cover}
    .viewer b{display:block;font-size:14px}
    .viewer span{display:block;color:var(--muted);font-size:12px}
    .scenarios{background:#fbfaf7}
    .scenario-grid{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line);border-left:1px solid var(--line)}
    .scenario{padding:24px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
    .scenario-num{color:var(--coral);font-weight:800;font-size:14px}
    .scenario h3{margin:14px 0 8px;font-size:18px}
    .scenario p{margin-bottom:14px;color:var(--muted);font-size:14px}
    .scenario a{font-size:13px;color:var(--teal);font-weight:800}
    .news-layout{display:grid;grid-template-columns:1.04fr .96fr;gap:32px}
    .lead-news{display:grid;grid-template-columns:1fr 1fr;gap:19px;align-items:start}
    .lead-news img{aspect-ratio:16/10;object-fit:cover;border-radius:var(--radius)}
    .news-date{color:var(--teal);font-size:12px;font-weight:800}
    .lead-news h3{margin:8px 0 9px;font-size:22px;line-height:1.45}
    .lead-news p{margin-bottom:0;color:var(--muted);font-size:14px}
    .news-list{margin:0;padding:0;list-style:none}
    .news-list li{display:grid;grid-template-columns:90px 1fr;gap:13px;padding:0 0 13px;margin-bottom:13px;border-bottom:1px solid var(--line)}
    .news-list li:last-child{margin-bottom:0}
    .news-list img{aspect-ratio:16/10;object-fit:cover;border-radius:4px}
    .news-list h3{margin:3px 0 4px;font-size:15px;line-height:1.42}
    .news-list p{margin:0;color:var(--muted);font-size:12px;line-height:1.45}
    .metrics{padding:64px 0;background:var(--charcoal);color:#fff}
    .metric-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
    .metric{padding-left:20px;border-left:1px solid rgba(255,255,255,.27)}
    .metric strong{display:block;color:#ff9d89;font-size:37px;line-height:1.1}
    .metric span{display:block;margin-top:8px;color:#d2d6d2;font-size:14px}
    .faq{background:var(--mist)}
    .accordion{border-top:1px solid var(--line)}
    .faq-item{border-bottom:1px solid var(--line)}
    .faq-item summary{position:relative;padding:18px 42px 18px 0;cursor:pointer;font-size:17px;font-weight:800;list-style:none}
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item summary::after{content:"+";position:absolute;right:6px;top:14px;color:var(--coral);font-size:25px;font-weight:400}
    .faq-item[open] summary::after{content:"−"}
    .faq-item p{max-width:900px;margin:0;padding:0 0 19px;color:var(--muted)}
    .cta{padding:76px 0;background:#fff4ef}
    .cta-inner{display:flex;align-items:center;justify-content:space-between;gap:28px;padding:34px 40px;border:1px solid rgba(232,93,69,.27);border-radius:var(--radius);background:url('/assets/images/983c5a3213b69f58.jpg') right center/42% auto no-repeat #fff4ef}
    .cta h2{max-width:660px}
    .cta p{max-width:660px;margin:10px 0 0;color:var(--muted)}
    .cta .btn{flex-shrink:0}
    footer{padding:56px 0 22px;background:#202221;color:#e4e6e2}
    .footer-grid{display:grid;grid-template-columns:1.3fr .8fr .9fr .7fr;gap:30px;padding-bottom:38px}
    .footer-brand{margin-bottom:12px;color:#fff}
    .footer-copy{max-width:270px;margin:0;color:#aeb4af;font-size:13px}
    .footer-grid h3{margin-bottom:12px;color:#fff;font-size:14px}
    .footer-grid a{display:block;margin:7px 0;color:#b9bdb9;font-size:13px}
    .footer-grid a:hover{color:#ff9d89}
    .copyright{padding-top:18px;border-top:1px solid rgba(255,255,255,.14);color:#929994;font-size:12px}
    .back-top{position:fixed;right:18px;bottom:18px;z-index:20;display:grid;place-items:center;width:42px;height:42px;border:1px solid var(--line);border-radius:6px;background:#fff;color:var(--ink);box-shadow:var(--shadow);font-size:18px}
    .back-top:hover{background:var(--coral);border-color:var(--coral);color:#fff}
    @media (max-width:1024px){
      .site-nav{gap:0}.site-nav a{padding:10px 8px}
      .search input{width:96px}
      .video-grid{grid-template-columns:repeat(3,1fr)}
      .latest-grid{grid-template-columns:repeat(2,1fr)}
      .latest-item:nth-last-child(-n+3){border-bottom:1px solid var(--line)}
      .latest-item:nth-last-child(-n+2){border-bottom:0}
      .category-grid{grid-template-columns:repeat(2,1fr)}
      .scenario-grid{grid-template-columns:repeat(2,1fr)}
      .footer-grid{grid-template-columns:1.3fr 1fr 1fr}
    }
    @media (max-width:768px){
      .container{width:min(calc(100% - 32px),var(--container))}
      .nav-wrap{min-height:62px}
      .menu-toggle{display:block}
      .site-nav{
        position:absolute;top:62px;right:16px;left:16px;display:none;align-items:stretch;gap:2px;
        padding:12px;border:1px solid var(--line);border-radius:7px;background:#fff;box-shadow:var(--shadow);
      }
      .site-nav.open{display:flex;flex-direction:column}
      .site-nav a{min-height:44px;padding:11px 13px}
      .search{margin-top:5px}.search input{width:100%}
      .hero{min-height:580px}.hero .container{padding:65px 0 96px}
      h1{font-size:40px}.hero-copy{font-size:15px}
      section{padding:58px 0}
      .benefit-grid{grid-template-columns:1fr}.benefit{border-right:0;border-bottom:1px solid var(--line)}.benefit:last-child{border-bottom:0}
      .video-grid{grid-template-columns:repeat(3,1fr);gap:14px}
      .rank-layout,.news-layout{grid-template-columns:1fr;gap:30px}
      .feedback-grid{grid-template-columns:1fr;gap:23px}
      .lead-news{grid-template-columns:180px 1fr}
      .metric-grid{grid-template-columns:repeat(2,1fr);gap:28px}
      .cta-inner{padding:29px;background-image:none}
      .footer-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media (max-width:520px){
      body{font-size:14px}.brand{font-size:17px}
      .hero{min-height:565px;background-position:58% center}.hero .container{padding-top:54px}
      h1{font-size:33px}.hero-sub{font-size:17px}.hero-copy{line-height:1.8}
      .hero-actions .btn{width:100%}.hero-meta{bottom:28px}
      .section-head{align-items:flex-start;flex-direction:column;margin-bottom:23px}
      h2{font-size:24px}.section-intro{font-size:14px}
      .video-grid{grid-template-columns:repeat(2,1fr);gap:12px}
      .card-info{padding:10px}.card-info h3{font-size:14px}.card-meta{font-size:11px}
      .latest-grid{grid-template-columns:1fr}.latest-item,.latest-item:nth-last-child(-n+2){border-bottom:1px solid var(--line)}.latest-item:last-child{border-bottom:0}
      .category-grid{grid-template-columns:1fr}.category{min-height:142px}
      .rank-main{grid-template-columns:40px 1fr;gap:10px}.rank-heat{grid-column:2}
      .rank-title{font-size:16px}
      .scenario-grid{grid-template-columns:1fr}
      .lead-news{grid-template-columns:1fr}.lead-news img{max-height:195px}
      .news-list li{grid-template-columns:76px 1fr}
      .metric-grid{grid-template-columns:1fr 1fr;gap:21px}.metric strong{font-size:30px}
      .cta-inner{align-items:flex-start;flex-direction:column;padding:25px}.cta .btn{width:100%}
      .footer-grid{grid-template-columns:1fr 1fr;gap:24px}.footer-grid>div:first-child{grid-column:1/-1}
      .back-top{right:12px;bottom:12px}
    }