/* roulang page: index */
:root{
      --primary:#2563eb;
      --primary-dark:#1d4ed8;
      --primary-soft:#eff6ff;
      --secondary:#0ea5e9;
      --accent:#f59e0b;
      --ink:#0f172a;
      --muted:#64748b;
      --light:#f8fafc;
      --panel:#ffffff;
      --line:#dbe5f2;
      --dark:#07111f;
      --dark-panel:#0d1b2f;
      --success:#16a34a;
      --danger:#ef4444;
      --radius-sm:12px;
      --radius:20px;
      --radius-lg:28px;
      --shadow-sm:0 8px 24px rgba(15,23,42,.08);
      --shadow:0 18px 45px rgba(15,23,42,.12);
      --shadow-blue:0 24px 70px rgba(37,99,235,.22);
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      color:var(--ink);
      font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;
      line-height:1.7;
      background:
        radial-gradient(circle at 8% 0%, rgba(37,99,235,.10), transparent 28rem),
        linear-gradient(180deg,#f8fbff 0%,#ffffff 42%,#f7fbff 100%);
      text-rendering:optimizeLegibility;
    }
    a{color:inherit;text-decoration:none}
    img,svg{max-width:100%;display:block}
    button,input,textarea{font:inherit}
    input,textarea{outline:none}
    ::selection{background:rgba(37,99,235,.18)}
    .container{width:min(var(--container), calc(100% - 40px));margin-inline:auto}
    .site-header{
      position:sticky;top:0;z-index:50;
      background:rgba(255,255,255,.86);
      backdrop-filter:saturate(180%) blur(18px);
      border-bottom:1px solid rgba(219,229,242,.9);
      box-shadow:0 10px 30px rgba(15,23,42,.04);
    }
    .nav-wrap{height:74px;display:flex;align-items:center;justify-content:space-between;gap:22px}
    .brand{display:flex;align-items:center;gap:12px;min-width:0;font-weight:900;letter-spacing:-.02em}
    .brand-mark{
      width:42px;height:42px;border-radius:14px;
      background:linear-gradient(135deg,var(--primary),var(--secondary));
      display:grid;place-items:center;color:#fff;
      box-shadow:0 12px 30px rgba(37,99,235,.28);
      flex:0 0 auto;
    }
    .brand span{font-size:18px;white-space:nowrap}
    .nav-menu{display:flex;align-items:center;gap:8px;padding:6px;border:1px solid var(--line);border-radius:999px;background:#fff}
    .nav-link{
      padding:10px 18px;border-radius:999px;font-weight:800;color:#334155;font-size:14px;
      transition:background .2s ease,color .2s ease,transform .2s ease;
    }
    .nav-link:hover,.nav-link.active{background:var(--primary-soft);color:var(--primary)}
    .nav-actions{display:flex;align-items:center;gap:10px}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:9px;
      min-height:44px;padding:0 18px;border-radius:999px;border:1px solid transparent;
      font-weight:900;font-size:14px;cursor:pointer;transition:transform .2s ease,box-shadow .2s ease,background .2s ease,border-color .2s ease,color .2s ease;
      white-space:nowrap;
    }
    .btn:hover{transform:translateY(-2px)}
    .btn:focus-visible,.nav-link:focus-visible,.mobile-toggle:focus-visible,input:focus-visible,textarea:focus-visible{
      outline:3px solid rgba(37,99,235,.22);outline-offset:3px;
    }
    .btn-primary{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;box-shadow:0 14px 30px rgba(37,99,235,.25)}
    .btn-primary:hover{box-shadow:0 18px 44px rgba(37,99,235,.32)}
    .btn-soft{background:#fff;color:var(--primary);border-color:#bfdbfe}
    .btn-soft:hover{background:var(--primary-soft);border-color:#93c5fd}
    .btn-dark{background:#0f172a;color:#fff;box-shadow:0 16px 40px rgba(15,23,42,.22)}
    .mobile-toggle{display:none;border:0;background:#eef6ff;color:var(--primary);border-radius:14px;width:44px;height:44px;place-items:center}
    main{overflow:hidden}
    section{position:relative}
    .section-pad{padding:86px 0}
    .section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:28px;margin-bottom:30px}
    .section-kicker{
      display:inline-flex;align-items:center;gap:8px;
      padding:7px 12px;border-radius:999px;background:var(--primary-soft);color:var(--primary);
      font-size:13px;font-weight:900;margin-bottom:12px;
    }
    .section-title{font-size:clamp(28px,4vw,44px);line-height:1.15;letter-spacing:-.04em;margin:0;color:var(--ink);font-weight:950}
    .section-desc{max-width:650px;color:var(--muted);font-size:16px;margin:12px 0 0}
    .hero{padding:42px 0 72px}
    .hero-shell{
      border-radius:34px;
      background:
        radial-gradient(circle at 88% 16%,rgba(14,165,233,.32),transparent 24rem),
        radial-gradient(circle at 35% 120%,rgba(37,99,235,.42),transparent 30rem),
        linear-gradient(135deg,#06101f 0%,#0d1b2f 55%,#0a2444 100%);
      color:#fff;box-shadow:var(--shadow-blue);overflow:hidden;border:1px solid rgba(255,255,255,.10);
    }
    .hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:26px;padding:44px}
    .hero-left{
      background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);
      border-radius:28px;padding:34px;backdrop-filter:blur(10px);
    }
    .hero-badge{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:rgba(255,255,255,.10);border:1px solid rgba(255,255,255,.16);color:#bfdbfe;font-size:13px;font-weight:900}
    h1{font-size:clamp(36px,6vw,68px);line-height:1.03;letter-spacing:-.06em;margin:22px 0 18px;font-weight:950}
    .hero-text{font-size:18px;color:#dbeafe;max-width:720px;margin:0 0 26px}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:28px 0}
    .hero-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:26px}
    .metric{
      padding:15px;border-radius:18px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);
    }
    .metric strong{display:block;font-size:24px;line-height:1;font-weight:950;color:#fff}
    .metric span{display:block;font-size:12px;color:#bfdbfe;margin-top:7px}
    .leader-panel{
      border-radius:28px;background:rgba(255,255,255,.94);color:var(--ink);
      padding:22px;box-shadow:0 24px 80px rgba(0,0,0,.24);align-self:stretch;
    }
    .panel-top{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:16px}
    .panel-title{font-weight:950;font-size:18px}
    .live-dot{display:inline-flex;align-items:center;gap:7px;color:var(--success);font-weight:900;font-size:12px}
    .live-dot::before{content:"";width:8px;height:8px;border-radius:999px;background:var(--success);box-shadow:0 0 0 6px rgba(22,163,74,.12)}
    .rank-list{display:grid;gap:12px}
    .rank-item{
      display:grid;grid-template-columns:36px 1fr auto;align-items:center;gap:12px;
      padding:14px;border:1px solid var(--line);border-radius:18px;background:#fff;
      transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
    }
    .rank-item:hover{transform:translateY(-2px);box-shadow:var(--shadow-sm);border-color:#bfdbfe}
    .rank-no{width:32px;height:32px;border-radius:11px;background:#eff6ff;color:var(--primary);display:grid;place-items:center;font-weight:950}
    .rank-name{font-weight:900;color:#0f172a}
    .rank-note{font-size:12px;color:var(--muted)}
    .rank-value{font-weight:950;color:var(--primary)}
    .card{
      background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
      box-shadow:var(--shadow-sm);transition:transform .22s ease,box-shadow .22s ease,border-color .22s ease;
    }
    .card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#bfdbfe}
    .badge{display:inline-flex;align-items:center;gap:7px;border-radius:999px;padding:6px 11px;font-size:12px;font-weight:900;background:#eef6ff;color:var(--primary)}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .commission-card{padding:24px}
    .icon-chip{width:48px;height:48px;border-radius:16px;background:linear-gradient(135deg,#dbeafe,#eff6ff);display:grid;place-items:center;color:var(--primary);margin-bottom:18px}
    .card h3{font-size:20px;margin:0 0 8px;font-weight:950;letter-spacing:-.02em}
    .card p{margin:0;color:var(--muted)}
    .reward-wrap{display:grid;grid-template-columns:.9fr 1.1fr;gap:22px;align-items:stretch}
    .progress-card{padding:28px;background:linear-gradient(180deg,#fff,#f8fbff)}
    .progress-bar{height:14px;border-radius:999px;background:#e2e8f0;overflow:hidden;margin:20px 0 12px}
    .progress-bar span{display:block;height:100%;width:68%;border-radius:999px;background:linear-gradient(90deg,var(--primary),var(--secondary),#38bdf8)}
    .step-list{display:grid;gap:12px}
    .step-item{display:flex;gap:12px;align-items:flex-start;padding:14px;border-radius:16px;background:#f8fbff;border:1px solid #e6eef9}
    .step-num{width:28px;height:28px;border-radius:10px;background:var(--primary);color:#fff;display:grid;place-items:center;font-weight:950;font-size:12px;flex:0 0 auto}
    .compare-table{overflow:hidden;border-radius:var(--radius);border:1px solid var(--line);box-shadow:var(--shadow-sm);background:#fff}
    .compare-row{display:grid;grid-template-columns:1fr 1fr 1fr;border-bottom:1px solid var(--line)}
    .compare-row:last-child{border-bottom:0}
    .compare-cell{padding:18px 20px;color:#475569}
    .compare-head{background:#f1f7ff;font-weight:950;color:#0f172a}
    .compare-us{color:var(--primary);font-weight:900;background:#fbfdff}
    .material-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:22px}
    .material-card{padding:26px}
    .material-list{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:18px}
    .material-item{padding:16px;border-radius:18px;background:#f8fbff;border:1px solid #e6eef9}
    .material-item strong{display:block;margin-bottom:4px}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
    .topic-tag{
      padding:10px 14px;border-radius:999px;background:#fff;border:1px solid var(--line);
      color:#334155;font-weight:800;font-size:14px;box-shadow:0 8px 18px rgba(15,23,42,.04);
      transition:transform .2s ease,background .2s ease,color .2s ease,border-color .2s ease;
    }
    .topic-tag:hover{transform:translateY(-2px);background:var(--primary);color:#fff;border-color:var(--primary)}
    .faq-list{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
    .faq-item{padding:22px}
    .faq-item h3{font-size:17px}
    .news-layout{display:grid;grid-template-columns:1.35fr .65fr;gap:22px}
    .news-list{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm);overflow:hidden}
    .news-link{display:grid;grid-template-columns:110px 1fr auto;gap:18px;align-items:center;padding:18px 20px;border-bottom:1px solid var(--line);transition:background .2s ease}
    .news-link:last-child{border-bottom:0}
    .news-link:hover{background:#f8fbff}
    .news-date{font-weight:950;color:var(--primary);font-size:14px}
    .news-title{font-weight:900;color:#0f172a}
    .news-meta{color:var(--muted);font-size:13px;margin-top:3px}
    .arrow{color:#94a3b8;font-weight:950}
    .update-card{padding:22px}
    .kpi-list{display:grid;gap:12px;margin-top:16px}
    .kpi{display:flex;align-items:center;justify-content:space-between;padding:14px;border-radius:16px;background:#f8fbff;border:1px solid #e6eef9}
    .kpi strong{font-size:20px;color:var(--primary)}
    .join{padding:76px 0 92px}
    .join-shell{
      display:grid;grid-template-columns:1fr .92fr;gap:26px;align-items:center;
      border-radius:34px;padding:36px;background:linear-gradient(135deg,#eff6ff,#ffffff 48%,#e0f2fe);
      border:1px solid #dbeafe;box-shadow:var(--shadow);
    }
    .form-card{background:#fff;border:1px solid var(--line);border-radius:26px;padding:24px;box-shadow:var(--shadow-sm)}
    .form-grid{display:grid;gap:12px}
    .field{width:100%;border:1px solid var(--line);border-radius:16px;padding:14px 15px;background:#f8fbff;color:#0f172a;transition:border-color .2s ease,background .2s ease,box-shadow .2s ease}
    .field:focus{border-color:#93c5fd;background:#fff;box-shadow:0 0 0 4px rgba(37,99,235,.10)}
    .form-tip{font-size:12px;color:var(--muted);margin-top:10px}
    .site-footer{background:#07111f;color:#cbd5e1;padding:50px 0 28px}
    .footer-grid{display:grid;grid-template-columns:1.2fr .8fr .8fr;gap:28px;padding-bottom:30px;border-bottom:1px solid rgba(255,255,255,.10)}
    .footer-title{color:#fff;font-weight:950;font-size:18px;margin-bottom:12px}
    .footer-text{color:#94a3b8;margin:0}
    .footer-links{display:grid;gap:9px}
    .footer-links a{color:#cbd5e1;transition:color .2s ease,transform .2s ease}
    .footer-links a:hover{color:#fff;transform:translateX(3px)}
    .copyright{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;color:#94a3b8;font-size:13px;padding-top:22px}
    @media (max-width:1024px){
      .hero-grid,.reward-wrap,.material-grid,.news-layout,.join-shell{grid-template-columns:1fr}
      .grid-4{grid-template-columns:repeat(2,1fr)}
      .section-pad{padding:70px 0}
    }
    @media (max-width:768px){
      .container{width:min(100% - 28px,var(--container))}
      .nav-wrap{height:66px}
      .nav-menu,.nav-actions{display:none}
      .mobile-toggle{display:grid}
      .mobile-panel{
        display:none;position:absolute;left:14px;right:14px;top:72px;background:#fff;border:1px solid var(--line);
        border-radius:22px;box-shadow:var(--shadow);padding:14px;
      }
      .mobile-panel.open{display:grid;gap:10px}
      .mobile-panel a{padding:12px 14px;border-radius:14px;font-weight:900;background:#f8fbff}
      .hero{padding:24px 0 54px}
      .hero-grid{padding:18px}
      .hero-left{padding:24px}
      .hero-metrics,.grid-3,.faq-list{grid-template-columns:1fr}
      .section-head{display:block}
      .compare-row{grid-template-columns:1fr}
      .compare-cell{border-bottom:1px solid var(--line)}
      .compare-row .compare-cell:last-child{border-bottom:0}
      .material-list{grid-template-columns:1fr}
      .news-link{grid-template-columns:1fr;gap:6px}
      .footer-grid{grid-template-columns:1fr}
    }
    @media (max-width:520px){
      .brand span{font-size:15px;max-width:220px;overflow:hidden;text-overflow:ellipsis}
      h1{font-size:38px}
      .hero-actions .btn,.join .btn{width:100%}
      .grid-4{grid-template-columns:1fr}
      .join-shell{padding:22px;border-radius:26px}
      .section-pad{padding:56px 0}
    }