/* roulang page: index */
:root{
      --primary:#246BFE;
      --primary-700:#174fd0;
      --primary-100:#eaf1ff;
      --secondary:#0ea5e9;
      --accent:#7c3aed;
      --warning:#f59e0b;
      --success:#10b981;
      --danger:#ef4444;
      --ink:#102033;
      --muted:#617086;
      --soft:#f5f8ff;
      --panel:#ffffff;
      --line:#dfe7f3;
      --line-strong:#c9d7ea;
      --shadow-sm:0 8px 22px rgba(20,58,112,.08);
      --shadow-md:0 18px 44px rgba(20,58,112,.12);
      --shadow-lg:0 28px 70px rgba(20,58,112,.16);
      --radius-sm:12px;
      --radius-md:18px;
      --radius-lg:26px;
      --radius-xl:34px;
      --container:1180px;
      --header-h:72px;
    }
    *{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 top left,rgba(36,107,254,.13),transparent 34rem),
        radial-gradient(circle at 88% 10%,rgba(14,165,233,.12),transparent 30rem),
        linear-gradient(180deg,#fbfdff 0%,#f6f9ff 42%,#ffffff 100%);
      line-height:1.68;
      -webkit-font-smoothing:antialiased;
      text-rendering:optimizeLegibility;
    }
    a{color:inherit;text-decoration:none;transition:color .2s ease,background .2s ease,border-color .2s ease,transform .2s ease,box-shadow .2s ease}
    a:hover{color:var(--primary)}
    img{max-width:100%;display:block}
    button,input,select,textarea{font:inherit}
    button{border:0}
    ::selection{background:rgba(36,107,254,.18);color:var(--primary-700)}
    .container-site{width:min(var(--container),calc(100% - 40px));margin-inline:auto}
    .skip-link{
      position:absolute;left:-999px;top:12px;background:var(--ink);color:#fff;padding:10px 14px;border-radius:999px;z-index:9999
    }
    .skip-link:focus{left:14px;outline:3px solid rgba(36,107,254,.35)}
    .site-header{
      position:sticky;top:0;z-index:1030;height:var(--header-h);
      background:rgba(255,255,255,.86);
      backdrop-filter:saturate(160%) blur(18px);
      border-bottom:1px solid rgba(208,220,238,.86);
      box-shadow:0 10px 26px rgba(15,40,80,.04);
    }
    .nav-shell{
      height:var(--header-h);
      display:grid;
      grid-template-columns:auto minmax(260px,1fr) auto;
      gap:18px;
      align-items:center;
    }
    .brand{
      display:inline-flex;align-items:center;gap:12px;min-width:230px;
      font-weight:900;letter-spacing:-.02em;color:var(--ink)
    }
    .brand-mark{
      width:42px;height:42px;border-radius:15px;
      display:grid;place-items:center;
      color:#fff;font-weight:900;
      background:linear-gradient(135deg,var(--primary),var(--secondary));
      box-shadow:0 14px 28px rgba(36,107,254,.26);
      position:relative;overflow:hidden;
    }
    .brand-mark:after{
      content:"";position:absolute;inset:8px;border-radius:11px;border:1px solid rgba(255,255,255,.45)
    }
    .brand-text{display:flex;flex-direction:column;line-height:1.1}
    .brand-text strong{font-size:17px}
    .brand-text span{font-size:12px;color:var(--muted);font-weight:700;margin-top:3px}
    .search-box{
      position:relative;max-width:520px;width:100%;justify-self:center
    }
    .search-box input{
      width:100%;height:44px;border-radius:999px;border:1px solid var(--line);
      background:#f8fbff;color:var(--ink);padding:0 118px 0 44px;
      outline:0;box-shadow:inset 0 1px 0 rgba(255,255,255,.85);
      transition:border-color .2s ease,box-shadow .2s ease,background .2s ease;
    }
    .search-box input:focus{
      background:#fff;border-color:rgba(36,107,254,.55);
      box-shadow:0 0 0 4px rgba(36,107,254,.12);
    }
    .search-icon{
      position:absolute;left:16px;top:50%;transform:translateY(-50%);
      color:var(--muted);font-size:15px
    }
    .search-kbd{
      position:absolute;right:12px;top:50%;transform:translateY(-50%);
      display:inline-flex;gap:5px;align-items:center;
      color:#7890ad;font-size:12px;font-weight:800;
      border:1px solid var(--line);border-radius:999px;padding:4px 10px;background:#fff;
    }
    .top-actions{display:flex;align-items:center;gap:10px;justify-self:end}
    .nav-home{
      display:inline-flex;align-items:center;gap:8px;height:40px;padding:0 14px;
      border-radius:999px;font-weight:800;color:var(--primary-700);
      background:var(--primary-100);border:1px solid rgba(36,107,254,.14)
    }
    .nav-home:hover,.nav-home:focus{background:#fff;box-shadow:var(--shadow-sm);color:var(--primary-700)}
    .pill-select{
      height:40px;border-radius:999px;border:1px solid var(--line);background:#fff;
      color:var(--muted);font-weight:800;padding:0 12px;outline:0
    }
    .pill-select:focus{border-color:rgba(36,107,254,.6);box-shadow:0 0 0 4px rgba(36,107,254,.12)}
    .mobile-menu-btn{
      display:none;width:42px;height:42px;border-radius:14px;background:#fff;border:1px solid var(--line);
      color:var(--ink);align-items:center;justify-content:center
    }
    .layout{
      display:grid;grid-template-columns:260px minmax(0,1fr);gap:28px;
      align-items:start;padding-top:24px;
    }
    .doc-aside{
      position:sticky;top:calc(var(--header-h) + 18px);
      background:rgba(255,255,255,.78);backdrop-filter:blur(14px);
      border:1px solid var(--line);border-radius:var(--radius-lg);
      box-shadow:var(--shadow-sm);padding:18px;
      max-height:calc(100vh - 98px);overflow:auto;
    }
    .aside-title{font-size:13px;color:var(--muted);font-weight:900;letter-spacing:.08em;margin:0 0 12px}
    .toc{display:grid;gap:6px;margin:0;padding:0;list-style:none}
    .toc a{
      display:flex;align-items:center;justify-content:space-between;
      border-radius:12px;padding:10px 11px;color:#51627a;font-weight:800;font-size:14px
    }
    .toc a:hover,.toc a.active{background:var(--primary-100);color:var(--primary-700)}
    .aside-note{
      margin-top:16px;padding:14px;border-radius:16px;background:#f8fbff;border:1px solid var(--line);
      color:var(--muted);font-size:13px
    }
    .aside-note strong{display:block;color:var(--ink);margin-bottom:4px}
    main{min-width:0}
    section{scroll-margin-top:calc(var(--header-h) + 18px)}
    .section{padding:42px 0}
    .section-tight{padding:28px 0}
    .section-head{
      display:flex;align-items:end;justify-content:space-between;gap:22px;margin-bottom:22px
    }
    .section-head .eyebrow{
      display:inline-flex;align-items:center;gap:8px;
      font-size:13px;font-weight:900;color:var(--primary-700);
      background:var(--primary-100);padding:7px 11px;border-radius:999px;margin-bottom:10px
    }
    .section-head h2{
      font-size:clamp(26px,3vw,38px);line-height:1.18;margin:0;color:var(--ink);letter-spacing:-.03em;font-weight:950
    }
    .section-head p{margin:10px 0 0;color:var(--muted);max-width:680px}
    .section-link{
      white-space:nowrap;display:inline-flex;align-items:center;gap:8px;
      font-weight:900;color:var(--primary-700);background:#fff;border:1px solid var(--line);
      padding:11px 14px;border-radius:999px;box-shadow:var(--shadow-sm)
    }
    .section-link:hover{transform:translateY(-2px);box-shadow:var(--shadow-md);color:var(--primary-700)}
    .btn-modern{
      display:inline-flex;align-items:center;justify-content:center;gap:9px;
      min-height:46px;padding:12px 18px;border-radius:999px;
      font-weight:900;border:1px solid transparent;
      transition:transform .2s ease,box-shadow .2s ease,background .2s ease,border-color .2s ease,color .2s ease;
      cursor:pointer;
    }
    .btn-primary-modern{
      color:#fff;background:linear-gradient(135deg,var(--primary),var(--secondary));
      box-shadow:0 16px 34px rgba(36,107,254,.28)
    }
    .btn-primary-modern:hover{color:#fff;transform:translateY(-2px);box-shadow:0 22px 44px rgba(36,107,254,.34)}
    .btn-soft{
      color:var(--primary-700);background:#fff;border-color:var(--line);box-shadow:var(--shadow-sm)
    }
    .btn-soft:hover{color:var(--primary-700);border-color:rgba(36,107,254,.34);transform:translateY(-2px);box-shadow:var(--shadow-md)}
    .btn-ghost{
      color:#52647c;background:rgba(255,255,255,.68);border-color:rgba(255,255,255,.55)
    }
    .btn-modern:focus-visible,.coupon-card:focus-within,.plan-card:focus-within,.news-link:focus-visible{
      outline:4px solid rgba(36,107,254,.16);outline-offset:3px
    }
    .badge-modern{
      display:inline-flex;align-items:center;gap:6px;border-radius:999px;padding:7px 11px;
      font-size:12px;font-weight:900;color:var(--primary-700);
      background:var(--primary-100);border:1px solid rgba(36,107,254,.14)
    }
    .hero{
      padding:34px 0 44px;
    }
    .invite-hero{
      position:relative;overflow:hidden;border-radius:var(--radius-xl);
      border:1px solid rgba(196,212,235,.92);
      background:
        linear-gradient(135deg,rgba(255,255,255,.96),rgba(240,247,255,.94)),
        radial-gradient(circle at 80% 20%,rgba(36,107,254,.25),transparent 28rem);
      box-shadow:var(--shadow-lg);
    }
    .invite-hero:before{
      content:"";position:absolute;inset:0;
      background:
        linear-gradient(90deg,rgba(36,107,254,.08) 1px,transparent 1px),
        linear-gradient(180deg,rgba(36,107,254,.07) 1px,transparent 1px);
      background-size:34px 34px;
      mask-image:linear-gradient(90deg,transparent,black 18%,black 82%,transparent);
      opacity:.7;pointer-events:none;
    }
    .invite-grid{
      position:relative;display:grid;grid-template-columns:1.15fr .85fr;gap:24px;
      padding:34px;
    }
    .hero-copy{padding:16px 6px 12px}
    .hero h1{
      font-size:clamp(34px,5vw,62px);line-height:1.04;letter-spacing:-.055em;
      margin:14px 0 18px;font-weight:980;color:#0b1d35;
    }
    .hero-intro{
      font-size:17px;color:#4f6078;max-width:780px;margin:0 0 22px;
    }
    .reward-strip{
      display:flex;flex-wrap:wrap;gap:10px;margin:18px 0 24px;padding:0;list-style:none
    }
    .reward-strip li{
      display:flex;align-items:center;gap:8px;padding:10px 12px;border-radius:999px;
      background:#fff;border:1px solid var(--line);box-shadow:0 8px 18px rgba(20,58,112,.06);
      color:#44566e;font-size:14px;font-weight:850;
    }
    .reward-strip i{
      width:18px;height:18px;border-radius:6px;display:inline-grid;place-items:center;
      background:var(--primary-100);color:var(--primary);font-style:normal;font-size:12px
    }
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin-top:10px}
    .hero-safe{
      margin-top:18px;display:flex;align-items:center;gap:10px;color:#64748b;font-size:13px;font-weight:750
    }
    .hero-safe span{
      width:26px;height:26px;border-radius:50%;display:grid;place-items:center;
      background:#ecfdf5;color:#059669;font-weight:950
    }
    .invite-panel{
      background:rgba(255,255,255,.86);border:1px solid rgba(209,222,241,.94);
      border-radius:28px;padding:22px;box-shadow:var(--shadow-md);
      align-self:stretch;display:flex;flex-direction:column;justify-content:space-between;gap:18px
    }
    .invite-top{
      display:flex;align-items:start;justify-content:space-between;gap:16px
    }
    .invite-code{
      padding:12px 14px;border-radius:18px;background:#f7faff;border:1px dashed rgba(36,107,254,.35)
    }
    .invite-code small{display:block;color:var(--muted);font-weight:800;margin-bottom:3px}
    .invite-code strong{font-size:22px;letter-spacing:.08em;color:var(--primary-700)}
    .live-badge{
      display:inline-flex;align-items:center;gap:7px;border-radius:999px;padding:8px 12px;
      color:#0369a1;background:#e0f2fe;border:1px solid rgba(14,165,233,.18);
      font-size:12px;font-weight:950
    }
    .pulse{
      width:8px;height:8px;border-radius:50%;background:#0ea5e9;
      box-shadow:0 0 0 6px rgba(14,165,233,.12)
    }
    .progress-wrap{
      padding:18px;border-radius:22px;background:linear-gradient(180deg,#f8fbff,#fff);
      border:1px solid var(--line)
    }
    .progress-label{display:flex;justify-content:space-between;gap:12px;margin-bottom:10px;color:#40536b;font-weight:900}
    .progress{
      height:14px;border-radius:999px;background:#e8eef8;overflow:hidden
    }
    .progress-bar{
      background:linear-gradient(90deg,var(--primary),var(--secondary));
      border-radius:999px;box-shadow:0 8px 18px rgba(36,107,254,.24)
    }
    .milestones{
      display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:14px
    }
    .milestone{
      border-radius:16px;background:#fff;border:1px solid var(--line);
      padding:12px;text-align:center
    }
    .milestone strong{display:block;color:var(--ink);font-size:18px;line-height:1}
    .milestone span{display:block;color:var(--muted);font-size:12px;font-weight:800;margin-top:5px}
    .countdown{
      display:grid;grid-template-columns:repeat(4,1fr);gap:10px
    }
    .timebox{
      border-radius:18px;background:#0f2140;color:#fff;text-align:center;padding:13px 8px;
      box-shadow:inset 0 1px 0 rgba(255,255,255,.12)
    }
    .timebox strong{display:block;font-size:22px;line-height:1;font-weight:950}
    .timebox span{font-size:12px;color:#b8c7dc;font-weight:800}
    .coupon-grid{
      display:grid;grid-template-columns:repeat(12,1fr);gap:18px
    }
    .coupon-card{
      grid-column:span 4;position:relative;overflow:hidden;border-radius:24px;
      background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-sm);
      padding:20px;min-height:210px;transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease
    }
    .coupon-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:rgba(36,107,254,.28)}
    .coupon-card.featured{grid-column:span 6;background:linear-gradient(135deg,#ffffff 0%,#edf5ff 100%);border-color:rgba(36,107,254,.28)}
    .coupon-card.dark{grid-column:span 6;background:linear-gradient(135deg,#102033,#1d3b68);color:#fff;border-color:rgba(255,255,255,.12)}
    .coupon-card.dark p,.coupon-card.dark .coupon-meta{color:#c7d7eb}
    .coupon-tag{
      display:inline-flex;border-radius:999px;padding:6px 10px;background:var(--primary-100);
      color:var(--primary-700);font-weight:950;font-size:12px;margin-bottom:14px
    }
    .coupon-card.dark .coupon-tag{background:rgba(255,255,255,.12);color:#fff}
    .coupon-card h3{font-size:22px;font-weight:950;letter-spacing:-.03em;margin:0 0 8px}
    .coupon-card p{color:var(--muted);margin:0 0 16px}
    .coupon-meta{
      display:flex;align-items:center;justify-content:space-between;gap:12px;
      color:#53657c;font-weight:900;font-size:13px;border-top:1px solid rgba(223,231,243,.9);
      padding-top:14px;margin-top:auto
    }
    .coupon-card.dark .coupon-meta{border-top-color:rgba(255,255,255,.15)}
    .coupon-value{font-size:34px;font-weight:980;letter-spacing:-.05em;color:var(--primary)}
    .coupon-card.dark .coupon-value{color:#7dd3fc}
    .rules-panel{
      display:grid;grid-template-columns:.9fr 1.1fr;gap:18px
    }
    .rule-summary{
      border-radius:28px;padding:26px;background:linear-gradient(135deg,#0f2140,#174a86);
      color:#fff;box-shadow:var(--shadow-md);position:relative;overflow:hidden
    }
    .rule-summary:after{
      content:"18+";position:absolute;right:-12px;bottom:-42px;font-size:120px;font-weight:1000;color:rgba(255,255,255,.08);letter-spacing:-.08em
    }
    .rule-summary h2{font-size:32px;font-weight:950;line-height:1.15;margin:10px 0 14px}
    .rule-summary p{color:#d7e5f8;margin:0}
    .rule-list{display:grid;gap:12px}
    .rule-item{
      display:grid;grid-template-columns:42px 1fr;gap:14px;align-items:start;
      padding:18px;border-radius:20px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-sm)
    }
    .rule-num{
      width:42px;height:42px;border-radius:15px;display:grid;place-items:center;
      background:var(--primary-100);color:var(--primary-700);font-weight:950
    }
    .rule-item h3{font-size:17px;font-weight:950;margin:0 0 5px}
    .rule-item p{margin:0;color:var(--muted);font-size:14px}
    .tier-board{
      border-radius:var(--radius-xl);background:#fff;border:1px solid var(--line);
      box-shadow:var(--shadow-md);padding:24px;overflow:hidden
    }
    .tier-line{
      position:relative;display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:18px
    }
    .tier-line:before{
      content:"";position:absolute;left:8%;right:8%;top:28px;height:8px;
      background:#e8eef8;border-radius:999px
    }
    .tier-line:after{
      content:"";position:absolute;left:8%;width:48%;top:28px;height:8px;
      background:linear-gradient(90deg,var(--primary),var(--secondary));border-radius:999px
    }
    .tier{
      position:relative;z-index:1;background:#fff;border:1px solid var(--line);
      border-radius:22px;padding:18px;text-align:center;box-shadow:var(--shadow-sm)
    }
    .tier-dot{
      width:60px;height:60px;margin:0 auto 12px;border-radius:22px;
      display:grid;place-items:center;background:var(--primary-100);color:var(--primary-700);
      font-weight:950;font-size:18px;border:4px solid #fff;box-shadow:0 12px 24px rgba(36,107,254,.12)
    }
    .tier.active{border-color:rgba(36,107,254,.4);box-shadow:var(--shadow-md)}
    .tier h3{font-size:18px;font-weight:950;margin:0 0 6px}
    .tier p{font-size:13px;color:var(--muted);margin:0}
    .plan-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .plan-card{
      border-radius:26px;background:#fff;border:1px solid var(--line);
      box-shadow:var(--shadow-sm);padding:24px;position:relative;
      transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease
    }
    .plan-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
    .plan-card.recommend{
      border-color:rgba(36,107,254,.42);
      background:linear-gradient(180deg,#ffffff 0%,#f1f7ff 100%);
      transform:translateY(-8px)
    }
    .recommend-badge{
      position:absolute;right:18px;top:18px;background:linear-gradient(135deg,var(--primary),var(--secondary));
      color:#fff;border-radius:999px;padding:7px 10px;font-size:12px;font-weight:950
    }
    .plan-card h3{font-size:22px;font-weight:950;margin:0 0 8px}
    .plan-price{display:flex;align-items:end;gap:4px;margin:14px 0;color:var(--primary-700)}
    .plan-price strong{font-size:42px;line-height:1;font-weight:980;letter-spacing:-.05em}
    .plan-price span{color:var(--muted);font-weight:800;margin-bottom:5px}
    .plan-card p{color:var(--muted);margin:0 0 16px}
    .check-list{list-style:none;padding:0;margin:18px 0;display:grid;gap:10px}
    .check-list li{display:flex;gap:9px;color:#40536b;font-weight:750;font-size:14px}
    .check-list li:before{content:"✓";color:var(--success);font-weight:950}
    .highlight-grid{
      display:grid;grid-template-columns:1.15fr .85fr;gap:18px
    }
    .highlight-wall{
      display:grid;grid-template-columns:repeat(2,1fr);gap:14px
    }
    .highlight-card{
      min-height:160px;border-radius:24px;padding:20px;border:1px solid var(--line);
      background:#fff;box-shadow:var(--shadow-sm);position:relative;overflow:hidden
    }
    .highlight-card:nth-child(1){background:linear-gradient(135deg,#fff,#eef5ff)}
    .highlight-card:nth-child(2){background:linear-gradient(135deg,#fff,#ecfeff)}
    .highlight-card:nth-child(3){background:linear-gradient(135deg,#fff,#f5f3ff)}
    .highlight-card:nth-child(4){background:linear-gradient(135deg,#fff,#fff7ed)}
    .highlight-icon{
      width:42px;height:42px;border-radius:16px;display:grid;place-items:center;
      background:var(--primary-100);color:var(--primary-700);font-weight:950;margin-bottom:14px
    }
    .highlight-card h3{font-size:18px;font-weight:950;margin:0 0 7px}
    .highlight-card p{margin:0;color:var(--muted);font-size:14px}
    .evidence-card{
      border-radius:28px;background:#102033;color:#fff;border:1px solid rgba(255,255,255,.1);
      box-shadow:var(--shadow-md);padding:24px;display:flex;flex-direction:column;justify-content:space-between;min-height:334px
    }
    .evidence-card p{color:#c8d7ea}
    .metric-row{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:18px}
    .metric{
      border-radius:18px;background:rgba(255,255,255,.08);padding:16px;border:1px solid rgba(255,255,255,.12)
    }
    .metric strong{display:block;font-size:30px;line-height:1;font-weight:980;color:#7dd3fc}
    .metric span{font-size:12px;color:#c8d7ea;font-weight:800}
    .privacy-band{
      display:grid;grid-template-columns:repeat(4,1fr);gap:14px
    }
    .privacy-item{
      border-radius:22px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-sm);
      padding:18px
    }
    .privacy-item strong{display:block;font-size:16px;margin-bottom:7px}
    .privacy-item span{color:var(--muted);font-size:13px}
    .news-layout{
      display:grid;grid-template-columns:minmax(0,1.2fr) 360px;gap:18px
    }
    .news-list,.recommend-box{
      border-radius:28px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-sm);padding:18px
    }
    .news-link{
      display:grid;grid-template-columns:auto 1fr auto;gap:14px;align-items:center;
      padding:15px;border-radius:18px;border:1px solid transparent
    }
    .news-link:hover{background:#f7faff;border-color:var(--line);color:inherit;transform:translateX(2px)}
    .news-date{
      width:58px;height:58px;border-radius:18px;background:var(--primary-100);
      color:var(--primary-700);display:grid;place-items:center;font-weight:950;line-height:1.05;text-align:center
    }
    .news-date span{display:block;font-size:12px;color:#5d7ac0}
    .news-link h3{font-size:17px;font-weight:950;margin:0 0 4px}
    .news-link p{margin:0;color:var(--muted);font-size:14px}
    .news-arrow{color:#8aa0ba;font-weight:950}
    .recommend-box h3{font-size:20px;font-weight:950;margin:0 0 14px}
    .rec-track{display:grid;gap:12px}
    .rec-card{
      display:grid;grid-template-columns:76px 1fr;gap:12px;align-items:center;
      padding:12px;border-radius:18px;background:#f8fbff;border:1px solid var(--line)
    }
    .rec-cover{
      height:76px;border-radius:18px;background:
        linear-gradient(135deg,rgba(36,107,254,.9),rgba(14,165,233,.72)),
        radial-gradient(circle at 70% 20%,rgba(255,255,255,.8),transparent 42%);
      display:grid;place-items:center;color:#fff;font-weight:950
    }
    .rec-card strong{display:block;margin-bottom:4px}
    .rec-card span{font-size:13px;color:var(--muted)}
    .faq-wrap{display:grid;grid-template-columns:.78fr 1.22fr;gap:18px}
    .faq-intro{
      border-radius:28px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-sm);padding:24px
    }
    .faq-intro h2{font-size:30px;line-height:1.18;font-weight:950;margin:10px 0 12px}
    .faq-intro p{color:var(--muted);margin:0}
    .accordion{
      --bs-accordion-border-color:var(--line);
      --bs-accordion-border-radius:22px;
      --bs-accordion-inner-border-radius:18px;
      --bs-accordion-btn-focus-box-shadow:0 0 0 4px rgba(36,107,254,.12);
      display:grid;gap:12px
    }
    .accordion-item{
      border:1px solid var(--line)!important;border-radius:22px!important;overflow:hidden;
      box-shadow:var(--shadow-sm);background:#fff
    }
    .accordion-button{
      font-weight:950;color:var(--ink);padding:18px 20px;background:#fff
    }
    .accordion-button:not(.collapsed){
      color:var(--primary-700);background:#f4f8ff;box-shadow:none
    }
    .accordion-body{color:var(--muted);padding:0 20px 20px}
    .cta{
      padding:34px 0 54px
    }
    .cta-panel{
      position:relative;overflow:hidden;border-radius:var(--radius-xl);
      background:
        radial-gradient(circle at 20% 20%,rgba(125,211,252,.24),transparent 22rem),
        linear-gradient(135deg,#102033,#164c93);
      color:#fff;padding:34px;border:1px solid rgba(255,255,255,.12);
      box-shadow:var(--shadow-lg);
      display:grid;grid-template-columns:1fr auto;gap:24px;align-items:center
    }
    .cta-panel:after{
      content:"";position:absolute;right:-120px;top:-160px;width:360px;height:360px;border-radius:50%;
      border:58px solid rgba(255,255,255,.06)
    }
    .cta-panel h2{position:relative;font-size:clamp(28px,3vw,44px);font-weight:980;line-height:1.12;margin:0 0 12px;letter-spacing:-.04em}
    .cta-panel p{position:relative;color:#d5e6fb;margin:0;max-width:760px}
    .cta-actions{position:relative;display:flex;gap:12px;flex-wrap:wrap;justify-content:flex-end}
    .cta-actions .btn-soft{background:#fff;color:var(--primary-700)}
    .footer{
      background:#0b1729;color:#d7e2f1;border-top:1px solid rgba(255,255,255,.08)
    }
    .footer-inner{
      width:min(var(--container),calc(100% - 40px));margin-inline:auto;
      padding:34px 0;display:grid;grid-template-columns:1fr auto;gap:24px;align-items:center
    }
    .footer-brand{display:flex;align-items:center;gap:12px}
    .footer-brand .brand-mark{width:38px;height:38px;border-radius:14px;box-shadow:none}
    .footer-brand strong{display:block;color:#fff;font-size:17px}
    .footer-brand span{display:block;color:#8fa4bf;font-size:13px;margin-top:2px}
    .footer-note{color:#8fa4bf;font-size:13px;margin-top:14px;max-width:760px}
    .footer-links{display:flex;gap:10px;flex-wrap:wrap;justify-content:flex-end}
    .footer-links a{
      border:1px solid rgba(255,255,255,.12);border-radius:999px;padding:9px 12px;color:#b8c7dc;font-weight:800;font-size:13px
    }
    .footer-links a:hover{background:rgba(255,255,255,.08);color:#fff}
    .floating-cta{
      position:fixed;left:50%;bottom:18px;transform:translateX(-50%);
      z-index:1020;display:none;align-items:center;gap:10px;
      padding:10px 12px;border-radius:999px;background:rgba(255,255,255,.92);
      border:1px solid var(--line);box-shadow:var(--shadow-lg);backdrop-filter:blur(14px)
    }
    .floating-cta span{font-size:13px;color:var(--muted);font-weight:850}
    @media (max-width:1100px){
      .layout{grid-template-columns:1fr}
      .doc-aside{position:relative;top:auto;max-height:none}
      .toc{grid-template-columns:repeat(4,1fr)}
      .invite-grid,.rules-panel,.highlight-grid,.faq-wrap,.news-layout{grid-template-columns:1fr}
      .coupon-card,.coupon-card.featured,.coupon-card.dark{grid-column:span 6}
      .plan-card.recommend{transform:none}
      .privacy-band{grid-template-columns:repeat(2,1fr)}
    }
    @media (max-width:900px){
      .nav-shell{grid-template-columns:auto 1fr auto}
      .search-box{display:none}
      .pill-select{display:none}
      .brand{min-width:auto}
      .brand-text span{display:none}
      .invite-grid{padding:24px}
      .plan-grid,.tier-line{grid-template-columns:1fr}
      .tier-line:before,.tier-line:after{display:none}
      .cta-panel{grid-template-columns:1fr}
      .cta-actions{justify-content:flex-start}
    }
    @media (max-width:768px){
      :root{--header-h:66px}
      .container-site,.footer-inner{width:min(100% - 28px,var(--container))}
      .site-header{height:var(--header-h)}
      .nav-shell{height:var(--header-h);gap:10px}
      .nav-home{display:none}
      .mobile-menu-btn{display:inline-flex}
      .top-actions{gap:8px}
      .brand-mark{width:38px;height:38px}
      .brand-text strong{font-size:15px}
      .layout{padding-top:14px}
      .doc-aside{display:none}
      .section{padding:32px 0}
      .section-head{display:block}
      .section-link{margin-top:14px}
      .hero{padding-top:22px}
      .hero h1{font-size:38px}
      .hero-intro{font-size:15px}
      .invite-grid{padding:20px}
      .invite-top{display:grid}
      .countdown{grid-template-columns:repeat(2,1fr)}
      .coupon-grid{grid-template-columns:1fr}
      .coupon-card,.coupon-card.featured,.coupon-card.dark{grid-column:auto}
      .highlight-wall{grid-template-columns:1fr}
      .metric-row{grid-template-columns:1fr}
      .privacy-band{grid-template-columns:1fr}
      .news-link{grid-template-columns:auto 1fr}
      .news-arrow{display:none}
      .footer-inner{grid-template-columns:1fr}
      .footer-links{justify-content:flex-start}
      .floating-cta{display:flex}
    }
    @media (max-width:520px){
      body{background:#f7faff}
      .invite-hero,.cta-panel{border-radius:24px}
      .reward-strip li{width:100%}
      .hero-actions .btn-modern{width:100%}
      .milestones{grid-template-columns:1fr}
      .coupon-value{font-size:30px}
      .rule-item{grid-template-columns:1fr}
      .cta-actions .btn-modern{width:100%}
      .floating-cta{left:12px;right:12px;transform:none;justify-content:space-between}
      .floating-cta span{display:none}
    }

/* 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}