/* roulang page: index */
:root{
      --primary:#2563eb;
      --primary-dark:#1d4ed8;
      --primary-soft:#eaf2ff;
      --secondary:#0ea5e9;
      --accent:#f59e0b;
      --success:#10b981;
      --danger:#ef4444;
      --ink:#0f172a;
      --text:#334155;
      --muted:#64748b;
      --weak:#94a3b8;
      --line:#dbe7f5;
      --line-soft:#edf3fb;
      --bg:#f7fbff;
      --surface:#ffffff;
      --surface-2:#f1f7ff;
      --shadow-sm:0 10px 24px rgba(15,23,42,.07);
      --shadow-md:0 18px 46px rgba(37,99,235,.13);
      --shadow-lg:0 28px 70px rgba(15,23,42,.16);
      --radius-sm:12px;
      --radius-md:18px;
      --radius-lg:28px;
      --radius-xl:36px;
      --container:1180px;
      --nav-height:76px;
      --ease:all .24s ease;
    }

    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;
      color:var(--text);
      background:
        radial-gradient(circle at 8% 2%, rgba(37,99,235,.12), transparent 28%),
        radial-gradient(circle at 92% 8%, rgba(14,165,233,.12), transparent 30%),
        linear-gradient(180deg,#f8fbff 0%,#ffffff 42%,#f7fbff 100%);
      line-height:1.72;
      font-size:16px;
      overflow-x:hidden;
    }
    a{color:inherit;text-decoration:none;transition:var(--ease)}
    a:hover{color:var(--primary)}
    img{max-width:100%;height:auto;display:block}
    button,input,textarea,select{font:inherit}
    ::selection{background:rgba(37,99,235,.16);color:var(--ink)}
    :focus-visible{outline:3px solid rgba(37,99,235,.28);outline-offset:3px;border-radius:10px}

    .container-main{
      max-width:var(--container);
      margin:0 auto;
      padding:0 24px;
    }
    .section{
      padding:82px 0;
      position:relative;
    }
    .section-tight{padding:58px 0}
    .eyebrow{
      display:inline-flex;
      align-items:center;
      gap:8px;
      padding:8px 13px;
      border:1px solid rgba(37,99,235,.16);
      border-radius:999px;
      background:rgba(255,255,255,.86);
      color:var(--primary-dark);
      font-weight:800;
      font-size:13px;
      letter-spacing:.02em;
      box-shadow:0 8px 20px rgba(37,99,235,.06);
    }
    .eyebrow .dot{
      width:8px;height:8px;border-radius:50%;
      background:linear-gradient(135deg,var(--primary),var(--secondary));
      box-shadow:0 0 0 6px rgba(37,99,235,.1);
    }
    .section-heading{
      display:flex;
      justify-content:space-between;
      align-items:flex-end;
      gap:28px;
      margin-bottom:32px;
    }
    .section-title{
      margin:14px 0 0;
      font-size:clamp(28px,3.2vw,42px);
      line-height:1.18;
      color:var(--ink);
      font-weight:900;
      letter-spacing:-.04em;
    }
    .section-desc{
      max-width:560px;
      margin:0;
      color:var(--muted);
      font-size:17px;
    }

    .site-header{
      position:sticky;
      top:0;
      z-index:1000;
      background:rgba(255,255,255,.86);
      backdrop-filter:blur(18px);
      border-bottom:1px solid rgba(219,231,245,.84);
      box-shadow:0 8px 30px rgba(15,23,42,.04);
    }
    .navbar{
      min-height:var(--nav-height);
      padding:0;
    }
    .navbar-brand{
      display:flex;
      align-items:center;
      gap:12px;
      color:var(--ink)!important;
      font-weight:950;
      letter-spacing:-.03em;
      padding:0;
      white-space:normal;
    }
    .brand-mark{
      width:42px;
      height:42px;
      border-radius:15px;
      display:grid;
      place-items:center;
      color:#fff;
      font-weight:950;
      background:
        linear-gradient(135deg,#2563eb 0%,#0ea5e9 55%,#38bdf8 100%);
      box-shadow:0 14px 30px rgba(37,99,235,.24);
    }
    .brand-text{
      display:flex;
      flex-direction:column;
      line-height:1.08;
    }
    .brand-text small{
      color:var(--muted);
      font-size:12px;
      font-weight:700;
      letter-spacing:0;
      margin-top:4px;
    }
    .navbar-nav{
      gap:8px;
      align-items:center;
    }
    .nav-link{
      color:var(--text)!important;
      font-weight:800;
      padding:10px 14px!important;
      border-radius:999px;
    }
    .nav-link:hover,.nav-link.active{
      color:var(--primary-dark)!important;
      background:var(--primary-soft);
    }
    .nav-actions{
      display:flex;
      align-items:center;
      gap:10px;
      margin-left:18px;
    }
    .mini-search{
      width:220px;
      position:relative;
    }
    .mini-search input{
      width:100%;
      border:1px solid var(--line);
      background:#fff;
      color:var(--text);
      border-radius:999px;
      padding:10px 14px 10px 38px;
      outline:none;
      transition:var(--ease);
      box-shadow:0 8px 20px rgba(15,23,42,.04);
    }
    .mini-search input:focus{
      border-color:rgba(37,99,235,.55);
      box-shadow:0 0 0 4px rgba(37,99,235,.1);
    }
    .mini-search span{
      position:absolute;
      left:14px;
      top:50%;
      transform:translateY(-50%);
      color:var(--weak);
    }
    .navbar-toggler{
      border:1px solid var(--line);
      border-radius:12px;
      padding:9px 11px;
      box-shadow:none!important;
    }

    .btn-main,.btn-ghost,.btn-light-blue{
      display:inline-flex;
      align-items:center;
      justify-content:center;
      gap:9px;
      border-radius:999px;
      border:1px solid transparent;
      padding:12px 20px;
      font-weight:900;
      line-height:1;
      transition:var(--ease);
      cursor:pointer;
      white-space:nowrap;
    }
    .btn-main{
      background:linear-gradient(135deg,var(--primary),var(--secondary));
      color:#fff!important;
      box-shadow:0 16px 34px rgba(37,99,235,.27);
    }
    .btn-main:hover{
      transform:translateY(-2px);
      box-shadow:0 22px 44px rgba(37,99,235,.33);
      color:#fff!important;
    }
    .btn-main:active{transform:translateY(0)}
    .btn-ghost{
      background:#fff;
      color:var(--primary-dark)!important;
      border-color:rgba(37,99,235,.18);
      box-shadow:0 12px 26px rgba(15,23,42,.07);
    }
    .btn-ghost:hover{
      border-color:rgba(37,99,235,.38);
      background:var(--primary-soft);
      transform:translateY(-2px);
    }
    .btn-light-blue{
      background:var(--primary-soft);
      color:var(--primary-dark)!important;
      border-color:rgba(37,99,235,.12);
      padding:10px 15px;
      font-size:14px;
    }
    .btn-light-blue:hover{background:#dbeafe;transform:translateY(-1px)}

    .hero{
      padding:62px 0 40px;
    }
    .hero-panel{
      border:1px solid rgba(219,231,245,.95);
      border-radius:var(--radius-xl);
      background:
        linear-gradient(135deg,rgba(255,255,255,.96),rgba(241,247,255,.92)),
        radial-gradient(circle at 72% 18%,rgba(14,165,233,.18),transparent 32%);
      box-shadow:var(--shadow-lg);
      overflow:hidden;
      position:relative;
    }
    .hero-panel:before{
      content:"";
      position:absolute;
      inset:auto -80px -110px auto;
      width:360px;height:360px;
      border-radius:50%;
      background:rgba(37,99,235,.08);
      filter:blur(2px);
    }
    .hero-inner{
      position:relative;
      padding:56px;
      display:grid;
      grid-template-columns:1.1fr .9fr;
      gap:34px;
      align-items:stretch;
    }
    .hero-copy{
      min-width:0;
      display:flex;
      flex-direction:column;
      justify-content:center;
    }
    h1{
      margin:18px 0 18px;
      font-size:clamp(38px,5vw,68px);
      line-height:1.05;
      color:var(--ink);
      font-weight:950;
      letter-spacing:-.065em;
    }
    .hero-lead{
      max-width:720px;
      margin:0;
      color:var(--text);
      font-size:18px;
      line-height:1.9;
    }
    .hero-actions{
      display:flex;
      flex-wrap:wrap;
      gap:13px;
      margin:28px 0 22px;
    }
    .trust-strip{
      display:flex;
      flex-wrap:wrap;
      gap:10px;
      margin-top:4px;
    }
    .trust-item{
      display:inline-flex;
      align-items:center;
      gap:8px;
      border:1px solid var(--line-soft);
      border-radius:999px;
      background:rgba(255,255,255,.78);
      padding:8px 12px;
      color:var(--muted);
      font-weight:700;
      font-size:13px;
    }
    .hero-stage{
      display:grid;
      grid-template-columns:1fr 1fr;
      gap:16px;
      min-width:0;
    }
    .cover-card{
      grid-column:span 2;
      min-height:230px;
      border-radius:28px;
      background:
        linear-gradient(135deg,rgba(15,23,42,.92),rgba(37,99,235,.78)),
        radial-gradient(circle at 20% 10%,rgba(255,255,255,.28),transparent 24%);
      color:#fff;
      padding:26px;
      display:flex;
      flex-direction:column;
      justify-content:space-between;
      position:relative;
      overflow:hidden;
      box-shadow:0 22px 42px rgba(15,23,42,.18);
    }
    .cover-card:after{
      content:"";
      position:absolute;
      width:180px;height:180px;
      border-radius:38px;
      right:-52px;top:-42px;
      background:rgba(255,255,255,.14);
      transform:rotate(24deg);
    }
    .cover-kicker{
      display:inline-flex;
      width:max-content;
      padding:7px 10px;
      border-radius:999px;
      background:rgba(255,255,255,.14);
      font-size:13px;
      font-weight:800;
    }
    .cover-card strong{
      font-size:28px;
      line-height:1.18;
      letter-spacing:-.04em;
      max-width:320px;
      position:relative;
      z-index:1;
    }
    .cover-meta{
      display:flex;
      gap:10px;
      flex-wrap:wrap;
      position:relative;
      z-index:1;
    }
    .cover-meta span{
      padding:7px 10px;
      background:rgba(255,255,255,.14);
      border:1px solid rgba(255,255,255,.16);
      border-radius:999px;
      font-size:13px;
      font-weight:800;
    }
    .mini-stat{
      border:1px solid rgba(219,231,245,.92);
      border-radius:22px;
      background:#fff;
      padding:18px;
      box-shadow:var(--shadow-sm);
    }
    .mini-stat b{
      display:block;
      color:var(--ink);
      font-size:28px;
      line-height:1;
      letter-spacing:-.04em;
    }
    .mini-stat span{
      color:var(--muted);
      font-size:13px;
      font-weight:700;
    }

    .metric-board{
      display:grid;
      grid-template-columns:1.1fr repeat(3,1fr);
      gap:18px;
    }
    .metric-feature,.metric-card,.material-card,.resource-card,.secure-card,.faq-card,.entry-card,.compare-panel,.news-panel,.join-panel{
      border:1px solid rgba(219,231,245,.96);
      background:rgba(255,255,255,.92);
      box-shadow:var(--shadow-sm);
      border-radius:var(--radius-lg);
      transition:var(--ease);
    }
    .metric-feature:hover,.metric-card:hover,.material-card:hover,.resource-card:hover,.secure-card:hover,.entry-card:hover{
      transform:translateY(-4px);
      box-shadow:var(--shadow-md);
      border-color:rgba(37,99,235,.2);
    }
    .metric-feature{
      padding:26px;
      background:
        linear-gradient(135deg,#ffffff 0%,#eff6ff 100%);
    }
    .metric-feature h3,.material-card h3,.resource-card h3,.secure-card h3,.entry-card h3{
      margin:0 0 10px;
      color:var(--ink);
      font-size:21px;
      font-weight:950;
      letter-spacing:-.03em;
    }
    .metric-feature p,.material-card p,.resource-card p,.secure-card p,.entry-card p{
      margin:0;
      color:var(--muted);
    }
    .reward-tags{
      display:flex;
      flex-wrap:wrap;
      gap:9px;
      margin-top:20px;
    }
    .badge-soft{
      display:inline-flex;
      align-items:center;
      gap:7px;
      border-radius:999px;
      padding:7px 10px;
      font-weight:800;
      font-size:13px;
      color:var(--primary-dark);
      background:var(--primary-soft);
      border:1px solid rgba(37,99,235,.1);
    }
    .metric-card{
      padding:22px;
    }
    .metric-card .num{
      color:var(--ink);
      font-weight:950;
      font-size:36px;
      line-height:1;
      letter-spacing:-.05em;
    }
    .metric-card .label{
      margin-top:12px;
      color:var(--muted);
      font-weight:800;
    }
    .trend-up{
      display:inline-flex;
      margin-top:15px;
      padding:6px 9px;
      border-radius:999px;
      background:rgba(16,185,129,.1);
      color:#047857;
      font-size:12px;
      font-weight:900;
    }

    .material-layout{
      display:grid;
      grid-template-columns:.9fr 1.1fr;
      gap:22px;
      align-items:start;
    }
    .directory-box{
      border-radius:var(--radius-lg);
      background:#0f172a;
      color:#e2e8f0;
      padding:26px;
      box-shadow:var(--shadow-lg);
      overflow:hidden;
      position:relative;
    }
    .directory-box:before{
      content:"";
      position:absolute;
      right:-80px;top:-80px;
      width:220px;height:220px;
      border-radius:50%;
      background:rgba(14,165,233,.22);
    }
    .directory-box h3{
      margin:0 0 18px;
      font-weight:950;
      color:#fff;
      position:relative;
    }
    .tree-list{
      list-style:none;
      padding:0;
      margin:0;
      display:grid;
      gap:12px;
      position:relative;
    }
    .tree-list li{
      display:flex;
      justify-content:space-between;
      gap:14px;
      padding:12px 14px;
      border-radius:15px;
      background:rgba(255,255,255,.07);
      border:1px solid rgba(255,255,255,.08);
    }
    .tree-list span:first-child{font-weight:850;color:#fff}
    .tree-list span:last-child{color:#bfdbfe;font-size:13px}
    .material-grid{
      display:grid;
      grid-template-columns:repeat(2,1fr);
      gap:18px;
    }
    .material-card{
      padding:24px;
    }
    .icon-pill{
      width:46px;height:46px;
      border-radius:16px;
      display:grid;
      place-items:center;
      margin-bottom:16px;
      color:var(--primary-dark);
      background:var(--primary-soft);
      font-size:22px;
      font-weight:950;
    }

    .news-layout{
      display:grid;
      grid-template-columns:minmax(0,1.35fr) minmax(280px,.65fr);
      gap:22px;
      align-items:start;
    }
    .news-panel,.ranking-panel{
      border:1px solid rgba(219,231,245,.96);
      background:#fff;
      border-radius:var(--radius-lg);
      box-shadow:var(--shadow-sm);
      overflow:hidden;
    }
    .news-list{
      list-style:none;
      padding:0;
      margin:0;
    }
    .news-list li{
      border-bottom:1px solid var(--line-soft);
    }
    .news-list li:last-child{border-bottom:0}
    .news-link{
      display:grid;
      grid-template-columns:1fr auto;
      gap:18px;
      padding:18px 22px;
      align-items:center;
    }
    .news-link:hover{
      background:#f8fbff;
      color:var(--primary-dark);
    }
    .news-title{
      color:var(--ink);
      font-weight:900;
      line-height:1.45;
    }
    .news-meta{
      display:flex;
      gap:10px;
      flex-wrap:wrap;
      margin-top:6px;
      color:var(--muted);
      font-size:13px;
      font-weight:700;
    }
    .news-date{
      color:var(--weak);
      font-size:13px;
      font-weight:800;
      white-space:nowrap;
    }
    .ranking-panel{
      padding:22px;
    }
    .ranking-panel h3{
      margin:0 0 16px;
      color:var(--ink);
      font-size:20px;
      font-weight:950;
    }
    .rank-list{
      list-style:none;
      margin:0;
      padding:0;
      display:grid;
      gap:11px;
    }
    .rank-list li{
      display:grid;
      grid-template-columns:34px 1fr auto;
      gap:10px;
      align-items:center;
      padding:12px;
      border-radius:16px;
      background:var(--surface-2);
      border:1px solid rgba(37,99,235,.06);
    }
    .rank-no{
      width:30px;height:30px;
      border-radius:11px;
      display:grid;
      place-items:center;
      background:#fff;
      color:var(--primary-dark);
      font-weight:950;
      box-shadow:0 6px 14px rgba(15,23,42,.06);
    }
    .rank-name{font-weight:900;color:var(--ink);line-height:1.35}
    .rank-heat{
      color:#ef7b00;
      font-weight:950;
      font-size:13px;
      white-space:nowrap;
    }

    .compare-panel{
      padding:12px;
      overflow:hidden;
    }
    .compare-head,.compare-row{
      display:grid;
      grid-template-columns:1fr 1fr 1fr;
      gap:10px;
      align-items:center;
    }
    .compare-head{
      padding:12px;
      color:var(--muted);
      font-weight:900;
      font-size:13px;
    }
    .compare-row{
      padding:16px 12px;
      border-top:1px solid var(--line-soft);
    }
    .compare-row strong{color:var(--ink);font-weight:950}
    .good,.bad{
      display:flex;
      align-items:flex-start;
      gap:8px;
      font-weight:800;
      line-height:1.55;
    }
    .good{color:#047857}
    .bad{color:#b45309}

    .resource-grid{
      display:grid;
      grid-template-columns:repeat(4,1fr);
      gap:18px;
    }
    .resource-card{
      padding:22px;
      position:relative;
      overflow:hidden;
    }
    .resource-card .index{
      position:absolute;
      right:18px;top:12px;
      font-size:44px;
      line-height:1;
      color:rgba(37,99,235,.09);
      font-weight:950;
    }
    .resource-card .btn-light-blue{margin-top:18px}

    .secure-wrap{
      display:grid;
      grid-template-columns:1fr 1fr 1fr;
      gap:18px;
    }
    .secure-card{
      padding:24px;
      background:linear-gradient(180deg,#fff 0%,#f8fbff 100%);
    }
    .secure-icon{
      width:52px;height:52px;
      border-radius:18px;
      display:grid;
      place-items:center;
      background:rgba(16,185,129,.1);
      color:#047857;
      font-size:24px;
      margin-bottom:16px;
      font-weight:950;
    }

    .faq-wrap{
      display:grid;
      grid-template-columns:.75fr 1.25fr;
      gap:24px;
      align-items:start;
    }
    .faq-note{
      border-radius:var(--radius-lg);
      background:linear-gradient(135deg,var(--primary),var(--secondary));
      color:#fff;
      padding:28px;
      box-shadow:var(--shadow-md);
      position:sticky;
      top:96px;
    }
    .faq-note h3{
      margin:0 0 10px;
      font-weight:950;
      letter-spacing:-.03em;
    }
    .faq-note p{margin:0;color:rgba(255,255,255,.82)}
    .accordion{
      display:grid;
      gap:14px;
    }
    .faq-card{
      overflow:hidden;
    }
    .accordion-button{
      color:var(--ink);
      font-weight:950;
      background:#fff;
      padding:20px 22px;
      box-shadow:none!important;
    }
    .accordion-button:not(.collapsed){
      background:var(--primary-soft);
      color:var(--primary-dark);
    }
    .accordion-button::after{
      background-size:18px;
    }
    .accordion-body{
      padding:0 22px 22px;
      color:var(--muted);
    }

    .join-panel{
      padding:34px;
      background:
        linear-gradient(135deg,#ffffff 0%,#eef6ff 100%);
      overflow:hidden;
      position:relative;
    }
    .join-panel:before{
      content:"";
      position:absolute;
      width:300px;height:300px;
      border-radius:50%;
      right:-130px;bottom:-150px;
      background:rgba(37,99,235,.11);
    }
    .join-grid{
      display:grid;
      grid-template-columns:1fr .9fr;
      gap:28px;
      position:relative;
      z-index:1;
    }
    .countdown{
      display:flex;
      gap:10px;
      flex-wrap:wrap;
      margin:24px 0;
    }
    .timebox{
      min-width:78px;
      padding:12px 10px;
      border:1px solid rgba(37,99,235,.12);
      border-radius:18px;
      background:#fff;
      box-shadow:0 10px 22px rgba(15,23,42,.05);
      text-align:center;
    }
    .timebox b{
      display:block;
      color:var(--ink);
      font-size:26px;
      line-height:1;
      font-weight:950;
      letter-spacing:-.04em;
    }
    .timebox span{
      color:var(--muted);
      font-size:12px;
      font-weight:800;
    }
    .subscribe-card{
      border:1px solid var(--line);
      border-radius:24px;
      background:#fff;
      padding:22px;
      box-shadow:var(--shadow-sm);
    }
    .form-label{
      color:var(--ink);
      font-weight:900;
      font-size:14px;
      margin-bottom:8px;
    }
    .form-control,.form-select{
      border:1px solid var(--line);
      border-radius:16px;
      padding:12px 14px;
      color:var(--text);
      box-shadow:none!important;
      transition:var(--ease);
    }
    .form-control:focus,.form-select:focus{
      border-color:rgba(37,99,235,.55);
      box-shadow:0 0 0 4px rgba(37,99,235,.1)!important;
    }
    .form-hint{
      color:var(--muted);
      font-size:13px;
      margin-top:12px;
    }
    .form-message{
      display:none;
      margin-top:14px;
      padding:12px 14px;
      border-radius:14px;
      background:rgba(16,185,129,.1);
      color:#047857;
      font-weight:850;
      border:1px solid rgba(16,185,129,.16);
    }

    .site-footer{
      background:#0f172a;
      color:#cbd5e1;
      padding:48px 0 28px;
    }
    .footer-grid{
      display:grid;
      grid-template-columns:1.1fr .9fr;
      gap:32px;
      align-items:start;
      padding-bottom:28px;
      border-bottom:1px solid rgba(255,255,255,.1);
    }
    .footer-brand{
      display:flex;
      align-items:center;
      gap:12px;
      color:#fff;
      font-weight:950;
      font-size:20px;
      margin-bottom:12px;
    }
    .footer-brand .brand-mark{
      width:40px;height:40px;
      box-shadow:none;
    }
    .footer-desc{
      max-width:620px;
      margin:0;
      color:#94a3b8;
    }
    .footer-links{
      display:flex;
      justify-content:flex-end;
      gap:12px;
      flex-wrap:wrap;
    }
    .footer-links a{
      color:#e2e8f0;
      padding:9px 12px;
      border-radius:999px;
      background:rgba(255,255,255,.06);
      font-weight:800;
      font-size:14px;
    }
    .footer-links a:hover{
      background:rgba(37,99,235,.35);
      color:#fff;
    }
    .copyright{
      margin-top:22px;
      display:flex;
      justify-content:space-between;
      gap:18px;
      flex-wrap:wrap;
      color:#94a3b8;
      font-size:14px;
    }

    @media (max-width:1024px){
      .hero-inner{grid-template-columns:1fr;padding:42px}
      .metric-board{grid-template-columns:1fr 1fr}
      .metric-feature{grid-column:span 2}
      .material-layout,.news-layout,.faq-wrap,.join-grid{grid-template-columns:1fr}
      .faq-note{position:relative;top:auto}
      .resource-grid{grid-template-columns:repeat(2,1fr)}
      .secure-wrap{grid-template-columns:1fr 1fr}
      .mini-search{width:180px}
    }
    @media (max-width:991px){
      .navbar-collapse{
        padding:14px 0 20px;
        border-top:1px solid var(--line-soft);
        margin-top:12px;
      }
      .navbar-nav{align-items:stretch}
      .nav-actions{
        margin-left:0;
        margin-top:12px;
        flex-direction:column;
        align-items:stretch;
      }
      .mini-search{width:100%}
      .nav-actions .btn-main{width:100%}
    }
    @media (max-width:768px){
      :root{--nav-height:68px}
      .container-main{padding:0 18px}
      .section{padding:62px 0}
      .section-heading{
        align-items:flex-start;
        flex-direction:column;
        gap:12px;
      }
      .hero{padding:34px 0 28px}
      .hero-inner{padding:28px;gap:24px}
      .hero-stage{grid-template-columns:1fr}
      .cover-card{grid-column:auto;min-height:220px}
      .metric-board,.material-grid,.resource-grid,.secure-wrap{grid-template-columns:1fr}
      .metric-feature{grid-column:auto}
      .compare-head{display:none}
      .compare-row{
        grid-template-columns:1fr;
        gap:12px;
        padding:18px;
      }
      .news-link{
        grid-template-columns:1fr;
        gap:8px;
      }
      .news-date{white-space:normal}
      .footer-grid{grid-template-columns:1fr}
      .footer-links{justify-content:flex-start}
    }
    @media (max-width:520px){
      body{font-size:15px}
      .brand-text small{display:none}
      .brand-mark{width:38px;height:38px;border-radius:13px}
      .navbar-brand{font-size:15px;max-width:235px}
      h1{font-size:36px}
      .hero-lead{font-size:16px}
      .hero-actions .btn-main,.hero-actions .btn-ghost{width:100%}
      .trust-item{width:100%;justify-content:center}
      .cover-card{padding:22px}
      .cover-card strong{font-size:24px}
      .mini-stat b{font-size:24px}
      .rank-list li{grid-template-columns:30px 1fr;align-items:start}
      .rank-heat{grid-column:2}
      .join-panel{padding:24px}
      .timebox{flex:1;min-width:68px}
      .copyright{display:block}
      .copyright span{display:block;margin-top:8px}
    }

/* 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}