/* roulang page: index */
:root{
      --brand:#6d5dfc;
      --brand-2:#9b5cff;
      --brand-3:#22d3ee;
      --ink:#172033;
      --muted:#647086;
      --soft:#f5f7ff;
      --soft-2:#eef3ff;
      --paper:#ffffff;
      --line:rgba(31,42,68,.12);
      --dark:#101729;
      --dark-2:#17213a;
      --success:#22c55e;
      --warning:#f59e0b;
      --danger:#fb7185;
      --radius-sm:12px;
      --radius:20px;
      --radius-lg:30px;
      --shadow:0 18px 50px rgba(36,45,82,.12);
      --shadow-sm:0 10px 28px rgba(36,45,82,.09);
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;
      color:var(--ink);
      background:
        radial-gradient(circle at 8% 8%, rgba(109,93,252,.16), transparent 28%),
        radial-gradient(circle at 88% 12%, rgba(34,211,238,.13), transparent 30%),
        linear-gradient(180deg,#fbfcff 0%,#f7f8ff 42%,#ffffff 100%);
      line-height:1.72;
      overflow-x:hidden;
    }
    a{color:inherit;text-decoration:none;transition:.22s ease}
    a:hover{color:var(--brand)}
    img{max-width:100%;display:block}
    button,input,textarea,select{font:inherit}
    button{border:0}
    ::selection{background:rgba(109,93,252,.18)}
    .container-xl{max-width:var(--container)}
    .skip-link{
      position:absolute;left:-999px;top:10px;z-index:9999;
      background:var(--dark);color:#fff;padding:10px 14px;border-radius:10px;
    }
    .skip-link:focus{left:12px;outline:3px solid rgba(34,211,238,.45)}
    .site-header{
      position:sticky;top:0;z-index:1000;
      background:rgba(255,255,255,.82);
      backdrop-filter:blur(18px);
      border-bottom:1px solid rgba(31,42,68,.08);
    }
    .topbar{
      display:flex;align-items:center;gap:18px;
      min-height:74px;
    }
    .brand-link{
      display:flex;align-items:center;gap:12px;min-width:max-content;
      font-weight:900;color:var(--ink);
      letter-spacing:.01em;
    }
    .brand-mark{
      width:42px;height:42px;border-radius:16px;
      display:grid;place-items:center;color:#fff;font-weight:900;
      background:linear-gradient(135deg,var(--brand),var(--brand-2) 55%,var(--brand-3));
      box-shadow:0 12px 30px rgba(109,93,252,.28);
    }
    .brand-text{font-size:1.12rem}
    .doc-search{
      flex:1;position:relative;max-width:520px;margin-left:14px;
    }
    .doc-search input{
      width:100%;height:44px;border-radius:999px;border:1px solid var(--line);
      background:#fff;padding:0 46px 0 44px;color:var(--ink);
      outline:none;box-shadow:0 8px 22px rgba(36,45,82,.05);
      transition:.22s ease;
    }
    .doc-search input:focus{
      border-color:rgba(109,93,252,.55);
      box-shadow:0 0 0 4px rgba(109,93,252,.12),0 10px 26px rgba(36,45,82,.08);
    }
    .search-icon{position:absolute;left:16px;top:50%;transform:translateY(-50%);color:#8a94a8}
    .nav-actions{display:flex;align-items:center;gap:10px;margin-left:auto}
    .version-pill,.lang-pill{
      display:inline-flex;align-items:center;gap:6px;
      padding:9px 13px;border-radius:999px;border:1px solid var(--line);
      background:rgba(255,255,255,.78);color:var(--muted);
      font-size:.92rem;font-weight:700;
    }
    .nav-link-main{
      display:inline-flex;align-items:center;justify-content:center;
      padding:10px 16px;border-radius:999px;font-weight:800;
      color:var(--brand);background:rgba(109,93,252,.1);
    }
    .nav-link-main.active,.nav-link-main:hover{
      background:linear-gradient(135deg,var(--brand),var(--brand-2));
      color:#fff;box-shadow:0 12px 26px rgba(109,93,252,.24);
      transform:translateY(-1px);
    }
    .mobile-menu-btn{
      display:none;width:44px;height:44px;border-radius:14px;
      background:var(--soft);color:var(--ink);
      align-items:center;justify-content:center;
    }
    .mobile-menu-btn:focus,.btn:focus,.form-control:focus{
      outline:0;box-shadow:0 0 0 4px rgba(109,93,252,.16);
    }
    .page-shell{
      display:grid;
      grid-template-columns:250px minmax(0,1fr);
      gap:28px;
      max-width:var(--container);
      margin:0 auto;
      padding:28px 12px 0;
    }
    .doc-sidebar{
      position:sticky;top:96px;height:calc(100vh - 112px);
      align-self:start;overflow:auto;
      padding:16px;border:1px solid var(--line);
      border-radius:var(--radius);
      background:rgba(255,255,255,.72);
      box-shadow:var(--shadow-sm);
    }
    .sidebar-title{
      color:var(--muted);font-size:.82rem;font-weight:900;
      letter-spacing:.08em;margin:2px 8px 12px;
    }
    .side-nav{display:grid;gap:6px}
    .side-nav a{
      display:flex;align-items:center;justify-content:space-between;
      padding:10px 12px;border-radius:13px;
      color:#44506a;font-weight:750;font-size:.94rem;
    }
    .side-nav a:hover,.side-nav a.active{
      color:var(--brand);background:rgba(109,93,252,.1);
    }
    .side-dot{
      width:7px;height:7px;border-radius:50%;background:rgba(109,93,252,.32);
    }
    main{min-width:0}
    section{scroll-margin-top:98px}
    .section{
      padding:72px 0;
    }
    .section-tight{padding:46px 0}
    .section-head{
      max-width:760px;margin-bottom:28px;
    }
    .eyebrow{
      display:inline-flex;align-items:center;gap:8px;
      padding:7px 12px;border:1px solid rgba(109,93,252,.18);
      border-radius:999px;background:rgba(109,93,252,.08);
      color:var(--brand);font-weight:900;font-size:.86rem;
      margin-bottom:12px;
    }
    .eyebrow::before{
      content:"";width:8px;height:8px;border-radius:50%;
      background:linear-gradient(135deg,var(--brand),var(--brand-3));
      box-shadow:0 0 0 5px rgba(109,93,252,.12);
    }
    h1,h2,h3,h4{line-height:1.18;font-weight:950;letter-spacing:-.035em;color:var(--ink)}
    h1{font-size:clamp(2.25rem,6vw,5.7rem);max-width:980px}
    h2{font-size:clamp(1.75rem,3.8vw,3.35rem)}
    h3{font-size:1.35rem}
    p{margin:0;color:var(--muted)}
    .lead{
      font-size:clamp(1rem,1.55vw,1.18rem);
      color:#46536b;max-width:830px;
    }
    .btn-brand,.btn-soft,.btn-darkline{
      display:inline-flex;align-items:center;justify-content:center;gap:9px;
      min-height:48px;padding:12px 20px;border-radius:999px;
      font-weight:900;transition:.22s ease;border:1px solid transparent;
      white-space:nowrap;
    }
    .btn-brand{
      color:#fff;background:linear-gradient(135deg,var(--brand),var(--brand-2));
      box-shadow:0 18px 34px rgba(109,93,252,.28);
    }
    .btn-brand:hover{color:#fff;transform:translateY(-2px);box-shadow:0 22px 42px rgba(109,93,252,.34)}
    .btn-soft{
      color:var(--brand);background:rgba(109,93,252,.1);
      border-color:rgba(109,93,252,.14);
    }
    .btn-soft:hover{background:rgba(109,93,252,.16);transform:translateY(-2px)}
    .btn-darkline{
      color:#fff;background:rgba(255,255,255,.1);
      border-color:rgba(255,255,255,.18);
    }
    .btn-darkline:hover{color:#fff;background:rgba(255,255,255,.16);transform:translateY(-2px)}
    .hero{
      position:relative;overflow:hidden;
      min-height:590px;border-radius:34px;
      padding:44px;
      background:
        linear-gradient(115deg,rgba(13,19,38,.84) 0%,rgba(37,31,88,.68) 52%,rgba(109,93,252,.42) 100%),
        url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='1280' height='680' viewBox='0 0 1280 680'%3E%3Cdefs%3E%3ClinearGradient id='g' x1='0' y1='0' x2='1' y2='1'%3E%3Cstop stop-color='%236d5dfc'/%3E%3Cstop offset='.55' stop-color='%239b5cff'/%3E%3Cstop offset='1' stop-color='%2322d3ee'/%3E%3C/linearGradient%3E%3C/defs%3E%3Crect width='1280' height='680' fill='%23101729'/%3E%3Ccircle cx='1040' cy='110' r='230' fill='url(/%23g)' opacity='.55'/%3E%3Ccircle cx='210' cy='590' r='220' fill='%2322d3ee' opacity='.16'/%3E%3Cpath d='M60 420 C220 260 350 520 520 340 S850 120 1220 290' fill='none' stroke='%23fff' stroke-width='2' opacity='.18'/%3E%3Cg opacity='.16' fill='%23fff'%3E%3Ccircle cx='165' cy='155' r='4'/%3E%3Ccircle cx='322' cy='90' r='3'/%3E%3Ccircle cx='760' cy='150' r='5'/%3E%3Ccircle cx='1110' cy='410' r='4'/%3E%3C/g%3E%3C/svg%3E") center/cover no-repeat;
      box-shadow:0 28px 80px rgba(16,23,41,.22);
    }
    .hero::after{
      content:"";position:absolute;inset:auto -10% -30% 30%;
      height:310px;background:radial-gradient(circle,rgba(34,211,238,.28),transparent 62%);
      pointer-events:none;
    }
    .hero-content{position:relative;z-index:2;display:grid;gap:26px}
    .hero .eyebrow{background:rgba(255,255,255,.12);color:#fff;border-color:rgba(255,255,255,.16)}
    .hero h1{color:#fff;margin:0}
    .hero .lead{color:rgba(255,255,255,.82)}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px}
    .hero-ribbon{
      margin-top:22px;display:grid;
      grid-template-columns:repeat(3,minmax(0,1fr));
      gap:14px;max-width:860px;
    }
    .metric-badge{
      border:1px solid rgba(255,255,255,.16);
      background:rgba(255,255,255,.12);
      backdrop-filter:blur(14px);
      border-radius:22px;padding:16px;
      color:#fff;
    }
    .metric-badge strong{display:block;font-size:1.55rem;line-height:1;font-weight:950}
    .metric-badge span{display:block;margin-top:8px;color:rgba(255,255,255,.72);font-size:.92rem}
    .hero-panel{
      position:absolute;right:34px;bottom:34px;z-index:3;
      width:min(390px,42%);
      border-radius:28px;padding:18px;
      background:rgba(255,255,255,.9);
      box-shadow:0 22px 60px rgba(16,23,41,.25);
      border:1px solid rgba(255,255,255,.38);
    }
    .panel-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}
    .panel-title{font-weight:950;color:var(--ink)}
    .live-dot{display:flex;align-items:center;gap:7px;color:var(--success);font-weight:900;font-size:.86rem}
    .live-dot i{width:9px;height:9px;border-radius:50%;background:var(--success);box-shadow:0 0 0 6px rgba(34,197,94,.12)}
    .progress-card{
      padding:14px;border-radius:20px;background:linear-gradient(180deg,#f8f9ff,#fff);
      border:1px solid var(--line);
    }
    .progress-row{display:flex;align-items:center;justify-content:space-between;color:#44506a;font-weight:800;font-size:.92rem;margin-bottom:10px}
    .progress{height:10px;border-radius:999px;background:#e9edfb;overflow:hidden}
    .progress-bar{background:linear-gradient(90deg,var(--brand),var(--brand-3));border-radius:999px}
    .mini-list{display:grid;gap:9px;margin-top:14px}
    .mini-item{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 12px;border-radius:16px;background:#fff;border:1px solid var(--line)}
    .mini-item span{color:var(--muted);font-size:.88rem}
    .mini-item b{color:var(--ink);font-size:.9rem}
    .feature-strip{
      display:grid;grid-template-columns:1.1fr .9fr;gap:18px;
    }
    .glass-card,.card-modern{
      border:1px solid var(--line);
      border-radius:var(--radius-lg);
      background:rgba(255,255,255,.78);
      box-shadow:var(--shadow-sm);
      overflow:hidden;
      transition:.22s ease;
    }
    .card-modern:hover,.glass-card:hover{
      transform:translateY(-4px);box-shadow:var(--shadow);
      border-color:rgba(109,93,252,.22);
    }
    .big-feature{
      padding:30px;
      background:
        radial-gradient(circle at 88% 20%,rgba(109,93,252,.14),transparent 28%),
        linear-gradient(180deg,#fff,#f8f9ff);
    }
    .feature-list{display:grid;gap:14px;margin-top:22px}
    .check-row{display:flex;gap:12px;align-items:flex-start}
    .check-icon{
      flex:0 0 28px;width:28px;height:28px;border-radius:10px;
      display:grid;place-items:center;
      color:#fff;background:linear-gradient(135deg,var(--brand),var(--brand-3));
      font-weight:950;font-size:.86rem;
    }
    .check-row b{display:block;color:var(--ink);margin-bottom:2px}
    .check-row span{color:var(--muted);font-size:.94rem}
    .matrix-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
    .matrix-card{
      padding:22px;border-radius:24px;background:#fff;border:1px solid var(--line);
      box-shadow:0 10px 26px rgba(36,45,82,.06);
      transition:.22s ease;
    }
    .matrix-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-sm)}
    .matrix-icon{
      width:44px;height:44px;border-radius:16px;
      display:grid;place-items:center;margin-bottom:14px;
      background:rgba(109,93,252,.1);color:var(--brand);font-weight:950;
    }
    .data-board{
      border-radius:34px;padding:28px;
      background:linear-gradient(135deg,#11182c,#20184d 62%,#2b5d77);
      color:#fff;box-shadow:0 28px 70px rgba(16,23,41,.23);
    }
    .data-board h2,.data-board h3{color:#fff}
    .data-board p{color:rgba(255,255,255,.72)}
    .stats-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin-top:24px}
    .stat-tile{
      padding:18px;border-radius:22px;background:rgba(255,255,255,.1);
      border:1px solid rgba(255,255,255,.13);
    }
    .stat-tile strong{display:block;font-size:2rem;line-height:1.1;font-weight:950}
    .stat-tile span{color:rgba(255,255,255,.72);font-size:.9rem}
    .compare-wrap{display:grid;grid-template-columns:1fr 1fr;gap:18px}
    .compare-card{padding:26px;border-radius:28px;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow-sm)}
    .compare-card.highlight{background:linear-gradient(180deg,#fff,#f6f3ff);border-color:rgba(109,93,252,.2)}
    .compare-list{display:grid;gap:12px;margin:20px 0 0;padding:0;list-style:none}
    .compare-list li{display:flex;gap:10px;color:#536078}
    .compare-list li::before{content:"";width:9px;height:9px;border-radius:50%;margin-top:10px;background:var(--brand);flex:0 0 9px}
    .group-section{
      background:linear-gradient(180deg,rgba(109,93,252,.08),rgba(34,211,238,.06));
      border:1px solid rgba(109,93,252,.12);
      border-radius:34px;padding:30px;
    }
    .group-layout{display:grid;grid-template-columns:.9fr 1.1fr;gap:22px;align-items:start}
    .steps{display:grid;gap:14px}
    .step-card{display:flex;gap:14px;padding:18px;border-radius:22px;background:#fff;border:1px solid var(--line);box-shadow:0 8px 22px rgba(36,45,82,.05)}
    .step-num{width:36px;height:36px;border-radius:14px;display:grid;place-items:center;background:var(--dark);color:#fff;font-weight:950;flex:0 0 36px}
    .hot-groups{display:grid;gap:12px}
    .group-card{padding:16px;border-radius:22px;background:#fff;border:1px solid var(--line)}
    .group-card-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:10px}
    .tag{
      display:inline-flex;align-items:center;gap:6px;padding:6px 10px;border-radius:999px;
      background:rgba(109,93,252,.1);color:var(--brand);font-size:.82rem;font-weight:900;
    }
    .tag.warn{background:rgba(245,158,11,.12);color:#b96b00}
    .tag.ok{background:rgba(34,197,94,.12);color:#16803c}
    .testimonials{
      display:grid;grid-template-columns:1fr 1.2fr;gap:18px;align-items:stretch;
    }
    .quote-main{padding:30px;border-radius:30px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-sm)}
    .quote-mark{font-size:3.4rem;line-height:1;color:rgba(109,93,252,.25);font-weight:950}
    .avatar-row{display:flex;align-items:center;gap:12px;margin-top:18px}
    .avatar{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand-3));display:grid;place-items:center;color:#fff;font-weight:950}
    .quote-grid{display:grid;gap:14px}
    .quote-card{padding:20px;border-radius:24px;background:rgba(255,255,255,.76);border:1px solid var(--line)}
    .quote-card b{display:block;margin-bottom:6px}
    .guide-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .guide-card{padding:22px;border-radius:26px;background:#fff;border:1px solid var(--line);box-shadow:0 10px 28px rgba(36,45,82,.06)}
    .guide-card ol,.guide-card ul{margin:14px 0 0;padding-left:20px;color:var(--muted)}
    .guide-card li{margin:7px 0}
    .news-layout{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(280px,.65fr);gap:22px}
    .news-list{display:grid;gap:12px}
    .news-item{
      display:grid;grid-template-columns:auto 1fr auto;gap:14px;align-items:center;
      padding:17px;border-radius:22px;background:#fff;border:1px solid var(--line);
      box-shadow:0 8px 20px rgba(36,45,82,.05);
    }
    .news-date{min-width:72px;color:var(--brand);font-weight:950;font-size:.9rem}
    .news-item h3{font-size:1.06rem;margin:0 0 3px}
    .news-item p{font-size:.92rem}
    .arrow{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:var(--soft);color:var(--brand);font-weight:950}
    .news-item:hover{transform:translateX(3px);border-color:rgba(109,93,252,.22)}
    .recommend-card{padding:24px;border-radius:28px;background:linear-gradient(180deg,#171f35,#25184d);color:#fff;position:sticky;top:96px}
    .recommend-card h3{color:#fff}
    .recommend-card p{color:rgba(255,255,255,.72)}
    .timeline{display:grid;gap:12px;margin-top:18px}
    .timeline-row{display:flex;gap:12px;align-items:flex-start}
    .timeline-row i{width:12px;height:12px;border-radius:50%;background:var(--brand-3);margin-top:8px;box-shadow:0 0 0 6px rgba(34,211,238,.12);flex:0 0 12px}
    .faq-wrap{display:grid;grid-template-columns:.82fr 1.18fr;gap:22px}
    .accordion-item{border:1px solid var(--line)!important;border-radius:20px!important;overflow:hidden;margin-bottom:12px;background:#fff;box-shadow:0 8px 22px rgba(36,45,82,.04)}
    .accordion-button{font-weight:900;color:var(--ink);padding:18px 20px;background:#fff}
    .accordion-button:not(.collapsed){color:var(--brand);background:rgba(109,93,252,.07);box-shadow:none}
    .accordion-button:focus{box-shadow:0 0 0 4px rgba(109,93,252,.12)}
    .accordion-body{color:var(--muted);padding:0 20px 20px}
    .cta-section{
      border-radius:34px;padding:32px;
      background:
        radial-gradient(circle at 85% 18%,rgba(34,211,238,.25),transparent 28%),
        linear-gradient(135deg,#6d5dfc,#8f50ff 58%,#16213f);
      color:#fff;overflow:hidden;position:relative;
    }
    .cta-section h2{color:#fff}
    .cta-section p{color:rgba(255,255,255,.78)}
    .cta-layout{display:grid;grid-template-columns:1fr 420px;gap:28px;align-items:center;position:relative;z-index:2}
    .lead-form{
      padding:20px;border-radius:26px;background:rgba(255,255,255,.95);
      border:1px solid rgba(255,255,255,.35);box-shadow:0 20px 50px rgba(16,23,41,.18);
    }
    .lead-form label{font-weight:850;color:var(--ink);font-size:.92rem;margin-bottom:6px}
    .form-control,.form-select{
      border-radius:15px;border:1px solid var(--line);min-height:46px;color:var(--ink);
    }
    .form-control:focus,.form-select:focus{border-color:rgba(109,93,252,.5)}
    .form-note{font-size:.84rem;color:var(--muted);margin-top:10px}
    .site-footer{
      margin-top:70px;background:#0f1729;color:#d8def0;
      padding:42px 0 24px;
    }
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr .8fr;gap:28px}
    .footer-brand{display:flex;align-items:center;gap:12px;font-weight:950;color:#fff;margin-bottom:12px}
    .footer-brand .brand-mark{width:38px;height:38px;border-radius:14px}
    .footer-text{color:#9faac2;max-width:520px}
    .footer-title{font-weight:950;color:#fff;margin-bottom:12px}
    .footer-links{display:grid;gap:9px}
    .footer-links a{color:#aeb8ce}
    .footer-links a:hover{color:#fff;transform:translateX(2px)}
    .copyright{
      margin-top:28px;padding-top:20px;border-top:1px solid rgba(255,255,255,.1);
      display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;
      color:#8995ad;font-size:.92rem;
    }
    .floating-cta{
      position:fixed;left:50%;bottom:18px;transform:translateX(-50%);
      z-index:999;display:flex;align-items:center;gap:12px;
      padding:10px 12px 10px 18px;border-radius:999px;
      background:rgba(17,24,43,.92);backdrop-filter:blur(16px);
      color:#fff;box-shadow:0 18px 46px rgba(16,23,41,.26);
      border:1px solid rgba(255,255,255,.12);
    }
    .floating-cta span{font-weight:850;font-size:.93rem;color:rgba(255,255,255,.82)}
    .floating-cta a{padding:9px 14px;border-radius:999px;background:#fff;color:var(--brand);font-weight:950}
    .floating-cta a:hover{transform:translateY(-1px);color:var(--brand)}
    @media (max-width: 1024px){
      .page-shell{grid-template-columns:1fr;padding-left:18px;padding-right:18px}
      .doc-sidebar{position:relative;top:auto;height:auto;display:none}
      .hero-panel{position:relative;right:auto;bottom:auto;width:100%;margin-top:24px}
      .hero{padding:34px;min-height:auto}
      .feature-strip,.group-layout,.testimonials,.faq-wrap,.cta-layout{grid-template-columns:1fr}
      .stats-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
      .guide-grid{grid-template-columns:1fr 1fr}
      .recommend-card{position:relative;top:auto}
    }
    @media (max-width: 768px){
      .topbar{min-height:auto;padding:14px 0;flex-wrap:wrap}
      .doc-search{order:3;max-width:none;width:100%;margin-left:0}
      .nav-actions{gap:8px}
      .version-pill,.lang-pill{display:none}
      .mobile-menu-btn{display:inline-flex}
      .nav-link-main{padding:10px 14px}
      .page-shell{padding-top:18px}
      .section{padding:54px 0}
      .hero{border-radius:26px;padding:26px}
      .hero-ribbon{grid-template-columns:1fr}
      .matrix-grid,.compare-wrap,.news-layout{grid-template-columns:1fr}
      .stats-grid{grid-template-columns:1fr 1fr}
      .footer-grid{grid-template-columns:1fr}
      .floating-cta{width:calc(100% - 28px);justify-content:space-between}
    }
    @media (max-width: 520px){
      .brand-text{font-size:1rem}
      .brand-mark{width:38px;height:38px}
      .hero{padding:22px;border-radius:22px}
      h1{font-size:2.18rem}
      .hero-actions{display:grid}
      .btn-brand,.btn-soft,.btn-darkline{width:100%}
      .stats-grid,.guide-grid{grid-template-columns:1fr}
      .news-item{grid-template-columns:1fr;gap:8px}
      .arrow{display:none}
      .cta-section,.group-section,.data-board{padding:22px;border-radius:26px}
      .floating-cta span{display:none}
      .floating-cta a{width:100%;text-align:center}
    }

/* 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}