/* roulang page: index */
:root{
      --ink:#13233f;
      --muted:#66758d;
      --subtle:#8a98aa;
      --paper:#f7faff;
      --white:#ffffff;
      --line:#e4ebf5;
      --blue:#3867f0;
      --blue-dark:#2446b6;
      --cyan:#16b8d4;
      --cyan-soft:#e8fbff;
      --violet:#7358ef;
      --shadow:0 18px 55px rgba(45,76,132,.11);
      --shadow-sm:0 8px 26px rgba(45,76,132,.08);
      --radius:24px;
      --radius-sm:15px;
      --container:1180px;
      --ease:all .3s cubic-bezier(.2,.7,.2,1);
    }
    *,*::before,*::after{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      color:var(--ink);
      background:var(--paper);
      font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;
      line-height:1.75;
      font-size:16px;
      overflow-x:hidden;
    }
    a{color:inherit;text-decoration:none;transition:var(--ease)}
    img{max-width:100%;height:auto;display:block}
    button,input{font:inherit}
    button:focus,a:focus,input:focus{outline:3px solid rgba(56,103,240,.22);outline-offset:3px}
    .container{width:min(var(--container),calc(100% - 48px));margin:0 auto}
    .section{padding:108px 0;position:relative}
    .section.alt{background:#fff}
    .section.soft{background:#eef5ff}
    .section-head{max-width:700px;margin-bottom:48px}
    .section-head.center{margin-left:auto;margin-right:auto;text-align:center}
    .eyebrow{
      display:inline-flex;align-items:center;gap:8px;
      color:var(--blue);font-size:13px;font-weight:800;
      letter-spacing:.08em;text-transform:uppercase;margin-bottom:14px
    }
    .eyebrow i{font-size:11px}
    h1,h2,h3,h4{margin:0;color:var(--ink);line-height:1.2;letter-spacing:-.035em}
    h1{font-size:clamp(42px,5.5vw,72px);font-weight:850}
    h2{font-size:clamp(30px,4vw,48px);font-weight:820}
    h3{font-size:22px;font-weight:760}
    p{margin:0;color:var(--muted)}
    .lead{font-size:18px;line-height:1.9}
    .topbar{background:#142a57;color:#dae6ff;font-size:13px}
    .topbar-inner{height:38px;display:flex;align-items:center;justify-content:space-between}
    .topbar strong{color:#fff}
    .topbar span:last-child{opacity:.8}
    .site-header{
      position:sticky;top:0;z-index:30;
      background:rgba(247,250,255,.88);
      backdrop-filter:blur(18px);
      border-bottom:1px solid rgba(224,233,246,.8)
    }
    .nav-wrap{height:76px;display:flex;align-items:center;justify-content:space-between;gap:28px}
    .brand{display:inline-flex;align-items:center;gap:11px;font-size:21px;font-weight:850;white-space:nowrap}
    .brand-mark{
      width:38px;height:38px;border-radius:12px;display:grid;place-items:center;
      color:#fff;background:linear-gradient(135deg,var(--blue),var(--cyan));
      box-shadow:0 8px 20px rgba(56,103,240,.25)
    }
    .nav-list{display:flex;align-items:center;gap:5px;margin:0;padding:0;list-style:none}
    .nav-list a{display:block;padding:10px 14px;border-radius:10px;color:#5f6f86;font-size:14px;font-weight:650}
    .nav-list a:hover,.nav-list a.active{color:var(--blue);background:#eaf0ff}
    .nav-action{display:inline-flex!important;align-items:center;gap:8px;color:#fff!important;background:var(--blue)!important;padding:11px 18px!important;box-shadow:0 8px 18px rgba(56,103,240,.2)}
    .nav-action:hover{background:var(--blue-dark)!important;transform:translateY(-2px)}
    .menu-toggle{display:none;border:0;background:transparent;color:var(--ink);font-size:22px}
    .hero{padding:82px 0 92px;background:linear-gradient(180deg,#f7faff 0%,#edf5ff 100%);overflow:hidden}
    .hero-grid{display:grid;grid-template-columns:1.08fr .92fr;align-items:center;gap:72px}
    .hero h1{max-width:720px;margin:10px 0 24px}
    .hero h1 span{color:var(--blue)}
    .hero-copy{max-width:680px;font-size:19px;line-height:1.9}
    .hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:32px}
    .button{
      display:inline-flex;align-items:center;justify-content:center;gap:9px;
      border:0;border-radius:12px;padding:14px 21px;font-size:15px;font-weight:750;
      cursor:pointer;transition:var(--ease)
    }
    .button.primary{color:#fff;background:var(--blue);box-shadow:0 12px 24px rgba(56,103,240,.22)}
    .button.primary:hover{background:var(--blue-dark);transform:translateY(-3px);box-shadow:0 16px 30px rgba(56,103,240,.3)}
    .button.secondary{color:var(--blue);background:#fff;border:1px solid #d9e4fa}
    .button.secondary:hover{border-color:var(--blue);background:#f3f6ff;transform:translateY(-3px)}
    .hero-proof{display:flex;gap:28px;flex-wrap:wrap;margin-top:34px;padding-top:24px;border-top:1px solid #dfe8f6}
    .proof-item strong{display:block;font-size:24px;line-height:1.2;color:var(--ink)}
    .proof-item span{font-size:13px;color:var(--subtle)}
    .invite-panel{
      position:relative;background:#fff;border:1px solid #e3ebf8;border-radius:30px;padding:28px;
      box-shadow:var(--shadow);overflow:hidden
    }
    .invite-panel::before{content:"";position:absolute;width:220px;height:220px;right:-100px;top:-100px;border-radius:50%;background:#e5faff}
    .panel-top{display:flex;align-items:center;justify-content:space-between;position:relative}
    .panel-label{font-size:13px;color:var(--muted);font-weight:700}
    .live-dot{display:inline-flex;align-items:center;gap:7px;color:#1c9e77;font-size:12px;font-weight:750}
    .live-dot i{font-size:8px}
    .reward-card{position:relative;margin:24px 0;padding:25px;border-radius:20px;background:linear-gradient(135deg,#2752d0,#4f7df8);color:#fff}
    .reward-card small{display:block;color:#dce6ff;font-size:13px;margin-bottom:5px}
    .reward-card strong{font-size:34px;line-height:1.15}
    .reward-card p{margin-top:10px;color:#dce6ff;font-size:14px}
    .progress-row{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px;font-size:13px;color:var(--muted)}
    .progress-row strong{color:var(--ink)}
    .progress{height:10px;border-radius:99px;background:#e7edf7;overflow:hidden}
    .progress span{display:block;height:100%;width:72%;border-radius:inherit;background:linear-gradient(90deg,var(--cyan),var(--blue))}
    .invite-list{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:22px}
    .invite-list div{padding:13px 10px;border-radius:13px;background:#f6f9fe;text-align:center}
    .invite-list i{display:block;color:var(--blue);margin-bottom:5px}
    .invite-list span{font-size:12px;color:var(--muted)}
    .ribbon{position:absolute;right:20px;top:18px;color:#fff;background:#ff8b4d;padding:5px 10px;border-radius:8px;font-size:11px;font-weight:800;transform:rotate(5deg)}
    .notice-strip{padding:15px 0;background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
    .notice-inner{display:flex;align-items:center;gap:16px;overflow:hidden;white-space:nowrap}
    .notice-tag{color:#fff;background:var(--blue);border-radius:7px;padding:4px 9px;font-size:12px;font-weight:800}
    .notice-text{font-size:14px;color:var(--muted)}
    .notice-text b{color:var(--ink)}
    .problem-grid{display:grid;grid-template-columns:1fr 1.35fr;gap:70px;align-items:start}
    .problem-list{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
    .problem-card{padding:24px;border:1px solid var(--line);border-radius:var(--radius-sm);background:#fff;box-shadow:var(--shadow-sm)}
    .problem-card i{width:38px;height:38px;display:grid;place-items:center;border-radius:11px;color:#e4775e;background:#fff0eb;margin-bottom:16px}
    .problem-card h3{font-size:18px;margin-bottom:8px}
    .problem-card p{font-size:14px;line-height:1.75}
    .workflow{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;position:relative}
    .workflow::before{content:"";position:absolute;left:11%;right:11%;top:31px;border-top:1px dashed #b9c9e4}
    .step{position:relative;z-index:1;background:#fff;padding:0 14px;text-align:center}
    .step-num{width:62px;height:62px;display:grid;place-items:center;margin:0 auto 20px;border:8px solid #edf3ff;border-radius:50%;color:#fff;background:var(--blue);font-weight:850}
    .step h3{font-size:18px;margin-bottom:9px}
    .step p{font-size:14px}
    .dashboard{display:grid;grid-template-columns:1.2fr .8fr;gap:22px}
    .dash-main,.dash-side{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm)}
    .dash-main{padding:30px}
    .dash-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:28px}
    .dash-title h3{font-size:21px}
    .status{color:#18876b;background:#e8faf4;border-radius:20px;padding:6px 11px;font-size:12px;font-weight:750}
    .route-row{display:grid;grid-template-columns:1.1fr .8fr .7fr;gap:15px;padding:18px 0;border-bottom:1px solid #edf1f7;align-items:center}
    .route-row:last-child{border-bottom:0}
    .route-name{display:flex;align-items:center;gap:11px;font-weight:700}
    .route-icon{width:35px;height:35px;display:grid;place-items:center;border-radius:10px;color:var(--blue);background:#edf2ff}
    .route-row small{display:block;color:var(--subtle);font-size:12px;font-weight:500}
    .latency{font-weight:800;color:#159573}
    .bar{height:7px;border-radius:99px;background:#edf1f7;overflow:hidden}
    .bar span{display:block;height:100%;border-radius:99px;background:#35c5a0}
    .dash-side{padding:28px}
    .dash-side h3{font-size:19px;margin-bottom:24px}
    .metric{padding:17px 0;border-bottom:1px solid #edf1f7}
    .metric:last-child{border-bottom:0}
    .metric-label{display:flex;justify-content:space-between;font-size:13px;color:var(--muted);margin-bottom:7px}
    .metric strong{font-size:20px;color:var(--ink)}
    .metric em{font-size:12px;color:#1b9c79;font-style:normal;font-weight:700}
    .matrix{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
    .matrix-card{padding:28px;border-radius:var(--radius);background:#fff;border:1px solid var(--line);transition:var(--ease)}
    .matrix-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
    .matrix-card.featured{color:#fff;background:#18356f;border-color:#18356f}
    .matrix-card.featured p,.matrix-card.featured li{color:#d7e3ff}
    .matrix-card i{font-size:25px;color:var(--blue);margin-bottom:22px}
    .matrix-card.featured i{color:#62dded}
    .matrix-card h3{font-size:21px;margin-bottom:12px}
    .matrix-card p{font-size:14px;line-height:1.8;margin-bottom:18px}
    .check-list{padding:0;margin:0;list-style:none}
    .check-list li{display:flex;gap:9px;align-items:flex-start;font-size:14px;color:var(--muted);margin:9px 0}
    .check-list li i{font-size:13px;color:#22a984;margin-top:5px;margin-bottom:0}
    .featured .check-list li i{color:#65d8e9}
    .compare{display:grid;grid-template-columns:1fr 1fr;gap:22px}
    .compare-card{padding:30px;border-radius:var(--radius);border:1px solid var(--line);background:#fff}
    .compare-card.highlight{background:#f0f5ff;border-color:#cbd9fb}
    .compare-card h3{display:flex;align-items:center;gap:10px;font-size:20px;margin-bottom:22px}
    .compare-card h3 i{color:var(--blue)}
    .compare-item{display:flex;justify-content:space-between;align-items:center;padding:15px 0;border-bottom:1px solid #e7edf6;font-size:14px}
    .compare-item:last-child{border-bottom:0}
    .compare-item span{color:var(--muted)}
    .compare-item b{color:var(--ink)}
    .compare-item b.good{color:#159573}
    .milestones{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1px solid var(--line);border-radius:var(--radius);background:#fff;overflow:hidden}
    .mile{padding:28px 24px;border-right:1px solid var(--line)}
    .mile:last-child{border-right:0}
    .mile strong{display:block;font-size:31px;color:var(--blue);margin-bottom:7px}
    .mile h3{font-size:17px;margin-bottom:8px}
    .mile p{font-size:14px}
    .news-grid{display:grid;grid-template-columns:1.15fr .85fr .85fr;gap:20px}
    .news-card{padding:26px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;transition:var(--ease)}
    .news-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-sm)}
    .news-card.primary{background:linear-gradient(145deg,#244ab9,#3c6bea);color:#fff}
    .news-card.primary p,.news-card.primary .news-meta{color:#d7e3ff}
    .news-type{display:inline-block;color:var(--blue);background:#edf2ff;border-radius:6px;padding:4px 8px;font-size:11px;font-weight:800;margin-bottom:24px}
    .primary .news-type{color:#fff;background:rgba(255,255,255,.16)}
    .news-card h3{font-size:20px;margin-bottom:14px}
    .news-card p{font-size:14px;line-height:1.8}
    .news-meta{display:flex;justify-content:space-between;margin-top:30px;color:var(--subtle);font-size:12px}
    .security-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}
    .security-card{display:flex;gap:18px;padding:25px;border-radius:var(--radius-sm);border:1px solid var(--line);background:#fff}
    .security-card i{flex:0 0 44px;width:44px;height:44px;display:grid;place-items:center;border-radius:13px;color:var(--blue);background:#edf2ff}
    .security-card h3{font-size:18px;margin-bottom:7px}
    .security-card p{font-size:14px}
    .faq-layout{display:grid;grid-template-columns:.8fr 1.2fr;gap:74px;align-items:start}
    .faq-list{display:grid;gap:12px}
    .faq-item{border:1px solid var(--line);border-radius:15px;background:#fff;overflow:hidden}
    .faq-item summary{cursor:pointer;list-style:none;padding:21px 24px;font-weight:750;display:flex;align-items:center;justify-content:space-between}
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item summary::after{content:"+";font-size:23px;color:var(--blue);font-weight:400}
    .faq-item[open] summary::after{content:"−"}
    .faq-item p{padding:0 24px 22px;font-size:14px;line-height:1.85}
    .final-section{padding:86px 0;background:linear-gradient(120deg,#18356f,#2c58c6);color:#fff}
    .final-box{display:flex;align-items:center;justify-content:space-between;gap:35px}
    .final-box h2{color:#fff;margin-bottom:14px}
    .final-box p{color:#dce7ff;max-width:650px}
    .final-box .button{background:#fff;color:var(--blue)}
    .final-box .button:hover{background:#eaf4ff}
    footer{background:#10244d;color:#b7c8e8;padding:58px 0 25px}
    .footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:45px;padding-bottom:42px}
    footer .brand{color:#fff;margin-bottom:17px}
    footer .brand-mark{box-shadow:none}
    .footer-desc{font-size:14px;line-height:1.8;max-width:290px;color:#9eb3d7}
    .footer-col h4{color:#fff;font-size:15px;margin-bottom:17px}
    .footer-col a{display:block;color:#9eb3d7;font-size:14px;margin:9px 0}
    .footer-col a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;padding-top:22px;border-top:1px solid rgba(214,228,255,.15);font-size:12px;color:#8198c0}
    .footer-bottom a:hover{color:#fff}
    @media(max-width:1024px){
      .hero-grid{gap:40px}
      .nav-list{gap:0}
      .nav-list a{padding-left:9px;padding-right:9px}
      .section{padding:86px 0}
      .problem-grid,.faq-layout{gap:38px}
    }
    @media(max-width:768px){
      .container{width:min(var(--container),calc(100% - 32px))}
      .topbar-inner{font-size:11px}
      .topbar span:last-child{display:none}
      .nav-wrap{height:68px}
      .menu-toggle{display:block}
      .nav-list{display:none;position:absolute;left:16px;right:16px;top:76px;padding:12px;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow)}
      .nav-list.open{display:block}
      .nav-list li{margin:3px 0}
      .nav-list a{padding:12px 14px}
      .nav-action{justify-content:center}
      .hero{padding:60px 0 70px}
      .hero-grid,.problem-grid,.dashboard,.compare,.faq-layout,.security-grid{grid-template-columns:1fr}
      .hero-copy{font-size:17px}
      .hero-proof{gap:20px}
      .workflow{grid-template-columns:repeat(2,1fr);gap:32px 15px}
      .workflow::before{display:none}
      .matrix{grid-template-columns:1fr}
      .milestones{grid-template-columns:repeat(2,1fr)}
      .mile:nth-child(2){border-right:0}
      .mile:nth-child(-n+2){border-bottom:1px solid var(--line)}
      .news-grid{grid-template-columns:1fr}
      .final-box{display:block}
      .final-box .button{margin-top:25px}
      .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
    }
    @media(max-width:520px){
      h1{font-size:40px}
      h2{font-size:32px}
      .section{padding:68px 0}
      .invite-panel{padding:20px}
      .invite-list{gap:6px}
      .invite-list div{padding:10px 5px}
      .problem-list{grid-template-columns:1fr}
      .workflow{grid-template-columns:1fr 1fr}
      .route-row{grid-template-columns:1.2fr .7fr}
      .route-row .bar{display:none}
      .milestones{grid-template-columns:1fr}
      .mile{border-right:0!important;border-bottom:1px solid var(--line)}
      .mile:last-child{border-bottom:0}
      .footer-grid{grid-template-columns:1fr}
      .footer-bottom{display:block}
      .footer-bottom span{display:block;margin-top:8px}
    }