:root{
      --primary:#0B3D91;
      --primary-dark:#082b66;
      --ink:#172033;
      --muted:#687386;
      --line:#e4e9f1;
      --soft:#f4f7fb;
      --white:#fff;
      --shadow:0 18px 50px rgba(15,39,82,.1);
      --radius:18px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:#fff;font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.7}
    a{color:inherit;text-decoration:none}
    img{max-width:100%;display:block}
    button{font:inherit}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}
    .topbar{background:#0b1b35;color:#dbe7fb;font-size:13px}
    .topbar-inner{min-height:38px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar-contact{display:flex;gap:22px}
    .topbar a{color:#e7effd}
    .header{position:relative;z-index:20;background:var(--white);border-bottom:1px solid var(--line)}
    .header-inner{height:78px;display:flex;align-items:center;gap:34px}
    .logo{display:inline-flex;align-items:center;gap:10px;min-width:max-content;font-weight:800;color:var(--primary);font-size:18px}
    .logo img{width:34px;height:34px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{display:flex;justify-content:center;align-items:stretch;gap:4px;list-style:none;margin:0;padding:0}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;gap:6px;height:78px;padding:0 14px;color:#26344b;font-size:14px;white-space:nowrap}
    .nav-link:hover,.nav-link:focus{color:var(--primary)}
    .has-arrow:after{content:"";width:6px;height:6px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg) translateY(-2px)}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% + 1px);left:50%;transform:translateX(-50%) translateY(8px);width:300px;padding:18px;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:var(--shadow);opacity:0;visibility:hidden;pointer-events:none;transition:.2s ease}
    .mega-menu{width:min(900px,calc(100vw - 40px));padding:24px}
    .nav-item:hover>.dropdown-panel,.nav-item:focus-within>.dropdown-panel,.nav-item:hover>.mega-menu,.nav-item:focus-within>.mega-menu{opacity:1;visibility:visible;pointer-events:auto;transform:translateX(-50%) translateY(0)}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;top:-12px;height:12px}
    .dropdown-panel>a{display:block;padding:8px 4px;border-bottom:1px solid #edf0f5;font-size:14px}
    .dropdown-panel>a:hover{color:var(--primary)}
    .dropdown-footer,.mega-footer{display:block!important;margin-top:13px;color:var(--primary)!important;font-weight:700}
    .mega-title-row{display:flex;justify-content:space-between;align-items:center;gap:18px;padding-bottom:17px;margin-bottom:17px;border-bottom:1px solid var(--line)}
    .mega-title-row strong{font-size:17px;color:var(--primary)}
    .mega-title-row span{font-size:12px;color:var(--muted)}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
    .mega-card{display:block;padding:13px;border:1px solid #e8edf4;border-radius:12px;background:#fbfcfe;transition:.2s}
    .mega-card:hover{border-color:#a9c0e9;box-shadow:0 7px 18px rgba(11,61,145,.08);transform:translateY(-2px)}
    .mega-card-head{display:flex;align-items:center;gap:9px}
    .mega-card-head img{width:30px;height:30px;object-fit:contain;border-radius:6px}
    .mega-card strong{font-size:13px}
    .mega-card p{font-size:12px;color:var(--muted);margin:7px 0 0;line-height:1.5}
    .mega-meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:9px;color:var(--muted);font-size:11px}
    .rating{display:block;color:#d58b1b;font-size:11px}
    .video-card>img,.product-card>img{width:100%;height:70px;object-fit:cover;border-radius:8px;margin-bottom:8px}
    .category-links{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:17px}
    .category-links a{padding:5px 10px;background:#eef4ff;border-radius:30px;color:var(--primary);font-size:12px}
    .header-btns{display:flex;align-items:center;gap:12px;white-space:nowrap}
    .member-entry{font-size:13px;color:var(--primary);font-weight:700}
    .account-entry{padding:8px 15px;border-radius:7px;background:var(--primary);color:#fff;font-size:13px}
    .hamburger{display:none;border:0;background:transparent;padding:7px;cursor:pointer}
    .hamburger span{display:block;width:23px;height:2px;margin:5px 0;background:var(--ink);transition:.2s}
    .hamburger.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
    .hamburger.active span:nth-child(2){opacity:0}
    .hamburger.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
    .drawer-overlay{position:fixed;inset:0;background:rgba(5,18,39,.55);opacity:0;visibility:hidden;z-index:40;transition:.2s}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;z-index:41;right:0;top:0;bottom:0;width:min(390px,88vw);background:#fff;transform:translateX(100%);transition:.25s;overflow:auto}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{display:flex;align-items:center;gap:15px;padding:20px;border-bottom:1px solid var(--line);color:var(--primary);font-weight:700}
    .drawer-head>a{margin-left:auto;padding:5px 12px;border-radius:5px;background:var(--primary);color:#fff;font-size:13px}
    .drawer-close{border:0;background:none;color:#596579;font-size:28px;line-height:1;cursor:pointer}
    .drawer-menu{padding:12px 20px 35px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 0;text-align:left;border:0;border-bottom:1px solid #edf0f5;background:none;color:var(--ink);font-size:15px}
    .drawer-toggle{cursor:pointer;position:relative}
    .drawer-toggle:after{content:"+";position:absolute;right:4px;color:var(--primary);font-size:20px}
    .drawer-toggle.active:after{content:"−"}
    .drawer-submenu{display:none;padding:5px 0 8px 14px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:7px 0;color:var(--muted);font-size:14px}
    .footer{margin-top:80px;background:#0c1a31;color:#c3cde0}
    .footer-grid{display:grid;grid-template-columns:1.45fr 1fr 1fr 1.1fr;gap:35px;padding:54px 0 42px}
    .footer .logo{color:#fff;margin-bottom:17px}
    .footer-brand p{max-width:320px;margin:0;color:#aebbd0;font-size:13px;line-height:1.9}
    .footer h3{margin:0 0 17px;color:#fff;font-size:15px}
    .footer-links{display:grid;gap:8px}
    .footer-links a,.footer-contact a,.footer-contact div{color:#aebbd0;font-size:13px}
    .footer-links a:hover,.footer-contact a:hover{color:#fff}
    .footer-contact{display:grid;gap:8px}
    .social-entry{color:#87b1f4!important;margin-top:7px}
    .footer-bottom{display:flex;justify-content:space-between;gap:25px;padding:18px 0;border-top:1px solid rgba(255,255,255,.12);font-size:12px;color:#8f9db4}
    .risk-note{text-align:right;max-width:600px}
    .about-page{background:#fff}
    .about-hero{padding:90px 0 75px;background:linear-gradient(135deg,#f2f6fd 0%,#fff 58%);border-bottom:1px solid var(--line)}
    .about-hero-inner{text-align:center;max-width:820px;margin:auto}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:6px 13px;border-radius:30px;color:var(--primary);background:#eaf1ff;font-size:13px;font-weight:700}
    .eyebrow:before{content:"";width:7px;height:7px;border-radius:50%;background:var(--primary)}
    .about-hero h1{margin:20px 0 15px;font-size:clamp(34px,5vw,60px);line-height:1.18;letter-spacing:-1px;color:#102b59}
    .about-hero h1 span{color:var(--primary)}
    .about-hero p{max-width:680px;margin:0 auto;color:var(--muted);font-size:17px}
    .about-section{padding:82px 0}
    .section-heading{text-align:center;max-width:680px;margin:0 auto 42px}
    .section-heading h2{margin:0 0 12px;font-size:32px;color:#122b55}
    .section-heading p{margin:0;color:var(--muted)}
    .intro-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:60px;align-items:center}
    .intro-copy h2{margin:0 0 20px;font-size:32px;color:#122b55}
    .intro-copy p{margin:0 0 16px;color:#5d697c}
    .intro-note{padding:22px 24px;border-left:4px solid var(--primary);background:#f5f8fd;color:#30496e}
    .signal-card{position:relative;min-height:340px;padding:35px;border-radius:24px;background:linear-gradient(145deg,#092859,#0b3d91);box-shadow:var(--shadow);overflow:hidden;color:#fff}
    .signal-card:before,.signal-card:after{content:"";position:absolute;border:1px solid rgba(255,255,255,.2);border-radius:50%}
    .signal-card:before{width:330px;height:330px;right:-120px;top:-110px}
    .signal-card:after{width:220px;height:220px;right:-65px;top:-55px}
    .signal-card h3{position:relative;margin:0 0 13px;font-size:23px}
    .signal-card p{position:relative;margin:0;color:#d5e4ff;max-width:310px}
    .signal-stat{position:absolute;left:35px;bottom:32px;display:flex;gap:36px}
    .signal-stat strong{display:block;font-size:29px;color:#fff}
    .signal-stat span{font-size:12px;color:#b9d0f5}
    .value-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .value-card{padding:28px;border:1px solid var(--line);border-radius:16px;background:#fff;box-shadow:0 8px 25px rgba(15,39,82,.045)}
    .value-icon{display:grid;place-items:center;width:45px;height:45px;border-radius:12px;background:#eaf1ff;color:var(--primary);font-weight:800;font-size:20px}
    .value-card h3{margin:19px 0 8px;font-size:18px}
    .value-card p{margin:0;color:var(--muted);font-size:14px}
    .timeline-wrap{background:#f5f8fc}
    .timeline{position:relative;max-width:900px;margin:auto;padding:10px 0}
    .timeline:before{content:"";position:absolute;left:50%;top:0;bottom:0;width:1px;background:#b8c9e3}
    .timeline-item{position:relative;width:50%;padding:0 45px 32px}
    .timeline-item:nth-child(even){margin-left:50%}
    .timeline-item:after{content:"";position:absolute;top:7px;right:-7px;width:13px;height:13px;border:3px solid #f5f8fc;border-radius:50%;background:var(--primary);box-shadow:0 0 0 1px var(--primary)}
    .timeline-item:nth-child(even):after{left:-7px;right:auto}
    .timeline-item h3{margin:0 0 5px;color:var(--primary);font-size:17px}
    .timeline-item p{margin:0;color:var(--muted);font-size:14px}
    .trust-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:15px;padding:25px;border:1px solid var(--line);border-radius:18px;background:#fff}
    .trust-strip div{text-align:center;padding:10px;border-right:1px solid var(--line)}
    .trust-strip div:last-child{border-right:0}
    .trust-strip strong{display:block;color:var(--primary);font-size:25px}
    .trust-strip span{font-size:13px;color:var(--muted)}
    .about-cta{padding:55px 30px;text-align:center;border-radius:22px;background:#eef4ff}
    .about-cta h2{margin:0 0 10px;color:#122b55}
    .about-cta p{margin:0 0 23px;color:var(--muted)}
    .primary-btn{display:inline-block;padding:11px 23px;border-radius:7px;background:var(--primary);color:#fff;font-weight:700;font-size:14px}
    .secondary-btn{display:inline-block;margin-left:8px;padding:10px 22px;border:1px solid #b7c8e5;border-radius:7px;color:var(--primary);font-weight:700;font-size:14px}
    .faq-question{width:100%;padding:17px 0;text-align:left;border:0;border-bottom:1px solid var(--line);background:none;color:var(--ink);font-weight:700;cursor:pointer}
    .faq-answer{display:none;padding:8px 0 15px;color:var(--muted);font-size:14px}
    .faq-answer.open{display:block}
    @media(max-width:1050px){
      .header-inner{gap:15px}.nav-link{padding:0 8px}.member-entry{display:none}
      .mega-menu{width:min(760px,calc(100vw - 30px))}
    }
    @media(max-width:800px){
      .container{width:min(100% - 30px,600px)}
      .topbar-inner{padding:8px 0;align-items:flex-start}.topbar-contact{gap:9px;flex-direction:column;text-align:right}
      .header-inner{height:68px}.main-nav{display:none}.hamburger{display:block}
      .account-entry{padding:7px 10px}.mega-grid{grid-template-columns:repeat(2,1fr)}
      .about-hero{padding:60px 0}.about-section{padding:58px 0}
      .intro-grid{grid-template-columns:1fr;gap:30px}.value-grid{grid-template-columns:1fr}
      .trust-strip{grid-template-columns:repeat(2,1fr)}.trust-strip div:nth-child(2){border-right:0}
      .trust-strip div{border-bottom:1px solid var(--line)}.trust-strip div:nth-child(3),.trust-strip div:nth-child(4){border-bottom:0}
      .timeline:before{left:7px}.timeline-item,.timeline-item:nth-child(even){width:100%;margin-left:0;padding:0 0 28px 32px}
      .timeline-item:after,.timeline-item:nth-child(even):after{left:0;right:auto}
      .footer-grid{grid-template-columns:1fr 1fr;gap:28px}.footer-bottom{display:block}.risk-note{text-align:left;margin-top:10px}
    }
    @media(max-width:480px){
      .topbar{font-size:11px}.mega-grid{grid-template-columns:1fr}.mega-title-row{display:block}
      .mega-title-row span{display:block;margin-top:6px}.header-btns{gap:6px}
      .about-hero h1{font-size:37px}.about-hero p{font-size:15px}
      .signal-card{min-height:300px;padding:26px}.signal-stat{left:26px;bottom:24px;gap:20px}
      .footer-grid{grid-template-columns:1fr}.secondary-btn{margin:10px 0 0}
    }