:root{
      --theme:#0B3D91;
      --ink:#14213d;
      --muted:#64748b;
      --line:#dbe4ef;
      --paper:#f5f8fc;
      --white:#fff;
      --accent:#16a36a;
      --shadow:0 16px 45px rgba(20,33,61,.09);
      --radius:18px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;color:var(--ink);background:var(--paper);font-family:"PingFang SC","Microsoft YaHei",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:#0f1c32;color:#c9d6e8;font-size:13px}
    .topbar .container{min-height:38px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar a{color:#dce8f6;margin-left:18px}
    .topbar a:hover{color:#fff}

    .header{position:relative;z-index:30;background:#fff;border-bottom:1px solid #e7edf5}
    .header-inner{height:78px;display:flex;align-items:center;gap:30px}
    .logo{display:flex;align-items:center;gap:10px;min-width:185px;font-size:19px;font-weight:800;color:var(--ink)}
    .logo img{width:38px;height:38px;object-fit:contain}
    .main-nav{flex:1}
    .nav-list{list-style:none;padding:0;margin:0;display:flex;align-items:stretch;justify-content:center;gap:4px}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;gap:5px;height:78px;padding:0 14px;color:#26354e;font-size:15px;white-space:nowrap}
    .nav-link:hover,.nav-link:focus-within{color:var(--theme)}
    .has-arrow:after{content:"";width:6px;height:6px;border-right:1.5px solid currentColor;border-bottom:1.5px 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:330px;padding:22px;background:#fff;border:1px solid #e4ebf4;border-radius:0 0 16px 16px;box-shadow:0 20px 45px rgba(17,38,70,.15);opacity:0;visibility:hidden;transition:.22s ease;pointer-events:none}
    .mega-menu{width:650px}
    .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;transform:translateX(-50%) translateY(0);pointer-events:auto}
    .dropdown-panel:before,.mega-menu:before{content:"";position:absolute;left:0;right:0;height:12px;top:-12px}
    .drop-title,.mega-title{font-size:14px;font-weight:800;color:var(--theme);margin-bottom:13px}
    .drop-list{display:grid;gap:8px}
    .drop-list a{display:block;padding:7px 0;color:#33445d;font-size:14px;border-bottom:1px solid #edf1f6}
    .drop-list a:hover,.mega-card:hover{color:var(--theme)}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
    .mega-card{min-height:108px;padding:12px;border:1px solid #e5ebf3;border-radius:12px;background:#fbfdff;display:flex;flex-direction:column;gap:3px;font-size:13px}
    .mega-card img{width:30px;height:30px;object-fit:contain;margin-bottom:4px}
    .mega-card strong{font-size:13px;color:#1e3150}
    .mega-card small,.drop-list small{font-size:11px;color:#8290a5;line-height:1.45}
    .mega-footer{display:block;margin-top:17px;color:var(--theme);font-weight:700;font-size:13px}
    .header-btns{display:flex;align-items:center;gap:9px;white-space:nowrap}
    .member-btn{font-size:13px;color:var(--theme)}
    .open-btn{padding:9px 15px;border-radius:8px;background:var(--theme);color:#fff;font-size:13px;font-weight:700}
    .hamburger{display:none;width:42px;height:40px;border:1px solid var(--line);border-radius:8px;background:#fff;padding:9px;cursor:pointer}
    .hamburger span{display:block;height:2px;background:var(--ink);margin:5px 0;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(7,17,34,.52);opacity:0;visibility:hidden;transition:.2s;z-index:60}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;z-index:70;top:0;right:0;width:min(380px,88vw);height:100vh;overflow:auto;background:#fff;transform:translateX(105%);transition:.25s ease;box-shadow:-15px 0 40px rgba(0,0,0,.15)}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-head{height:72px;display:flex;align-items:center;gap:16px;padding:0 22px;border-bottom:1px solid var(--line);font-weight:800}
    .drawer-head>a{margin-left:auto;color:var(--theme);font-size:14px}
    .drawer-close{border:0;background:transparent;font-size:30px;line-height:1;color:#6a7890;cursor:pointer}
    .drawer-menu{padding:14px 22px 35px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 0;border:0;border-bottom:1px solid #edf1f6;background:transparent;text-align:left;color:var(--ink);font-weight:700;cursor:pointer}
    .drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:18px}
    .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:8px 0;color:var(--muted);font-size:14px}

    .about-page{overflow:hidden}
    .about-hero{position:relative;padding:92px 0 105px;background:linear-gradient(135deg,#0d1d35 0%,#102e59 58%,#0B3D91 100%);color:#fff}
    .about-hero:before{content:"";position:absolute;inset:0;opacity:.18;background-image:linear-gradient(rgba(255,255,255,.12) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.12) 1px,transparent 1px);background-size:42px 42px;mask-image:linear-gradient(to bottom,#000,transparent)}
    .about-hero:after{content:"";position:absolute;width:400px;height:400px;right:-120px;top:-160px;border:1px solid rgba(118,207,255,.32);border-radius:50%;box-shadow:0 0 0 35px rgba(118,207,255,.07),0 0 0 70px rgba(118,207,255,.04)}
    .about-hero .container{position:relative;z-index:1}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;color:#88d7ff;font-size:13px;font-weight:800;letter-spacing:2px}
    .eyebrow:before{content:"";width:22px;height:2px;background:#49c1f2}
    .about-hero h1{max-width:760px;margin:18px 0 20px;font-size:clamp(34px,5vw,65px);line-height:1.15;letter-spacing:-1px}
    .about-hero p{max-width:650px;margin:0;color:#d2e1f2;font-size:18px}
    .hero-points{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
    .hero-points span{padding:7px 13px;border:1px solid rgba(255,255,255,.25);border-radius:30px;color:#e1f2ff;font-size:13px;background:rgba(255,255,255,.06)}

    .about-intro{padding:92px 0;background:#fff}
    .section-heading{max-width:710px;margin-bottom:42px}
    .section-heading .eyebrow{color:var(--theme);letter-spacing:1px}
    .section-heading .eyebrow:before{background:var(--theme)}
    .section-heading h2{margin:12px 0 12px;font-size:clamp(28px,4vw,43px);line-height:1.2}
    .section-heading p{margin:0;color:var(--muted)}
    .intro-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:60px;align-items:start}
    .intro-copy p{margin:0 0 18px;color:#52627a}
    .principle-list{display:grid;gap:15px}
    .principle{display:flex;gap:15px;padding:19px;border:1px solid var(--line);border-radius:14px;background:#fbfdff}
    .principle-index{flex:0 0 38px;height:38px;display:grid;place-items:center;border-radius:10px;background:#eaf2ff;color:var(--theme);font-weight:800}
    .principle h3{margin:0 0 3px;font-size:16px}
    .principle p{margin:0;color:var(--muted);font-size:13px;line-height:1.6}

    .capabilities{padding:88px 0;background:#f3f7fb}
    .capability-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:17px}
    .capability-card{padding:25px 21px;background:#fff;border:1px solid #e3ebf4;border-radius:var(--radius);box-shadow:0 8px 24px rgba(21,50,89,.04)}
    .capability-card .icon{width:42px;height:42px;display:grid;place-items:center;border-radius:12px;background:var(--theme);color:#fff;font-weight:800}
    .capability-card h3{margin:18px 0 7px;font-size:17px}
    .capability-card p{margin:0;color:var(--muted);font-size:13px;line-height:1.7}

    .timeline-section{padding:90px 0;background:#fff}
    .timeline{position:relative;max-width:900px;margin:50px auto 0}
    .timeline:before{content:"";position:absolute;top:0;bottom:0;left:50%;width:1px;background:#cbd9e8}
    .timeline-item{position:relative;width:50%;padding:0 42px 34px}
    .timeline-item:nth-child(odd){left:0;text-align:right}
    .timeline-item:nth-child(even){left:50%;text-align:left}
    .timeline-dot{position:absolute;top:5px;width:13px;height:13px;border:3px solid #fff;border-radius:50%;background:var(--accent);box-shadow:0 0 0 2px var(--accent)}
    .timeline-item:nth-child(odd) .timeline-dot{right:-7px}
    .timeline-item:nth-child(even) .timeline-dot{left:-7px}
    .timeline-year{color:var(--theme);font-size:13px;font-weight:800;letter-spacing:1px}
    .timeline-item h3{margin:5px 0 6px;font-size:18px}
    .timeline-item p{margin:0;color:var(--muted);font-size:14px}

    .trust-section{padding:85px 0;background:#f3f7fb}
    .trust-box{display:grid;grid-template-columns:1fr 1fr;gap:35px;align-items:stretch}
    .trust-panel{padding:33px;border-radius:20px;background:#10233f;color:#fff}
    .trust-panel h2{margin:0 0 15px;font-size:28px}
    .trust-panel p{margin:0;color:#c8d7e9}
    .trust-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:25px}
    .trust-tags span{padding:8px 12px;border:1px solid rgba(255,255,255,.2);border-radius:7px;color:#dbe9f7;font-size:13px}
    .contact-panel{padding:33px;border:1px solid var(--line);border-radius:20px;background:#fff}
    .contact-panel h2{margin:0 0 12px;font-size:28px}
    .contact-panel p{margin:0 0 22px;color:var(--muted)}
    .contact-actions{display:flex;flex-wrap:wrap;gap:12px}
    .primary-action,.secondary-action{display:inline-block;padding:11px 18px;border-radius:8px;font-size:14px;font-weight:700}
    .primary-action{background:var(--theme);color:#fff}
    .secondary-action{border:1px solid #cbd8e8;color:var(--theme);background:#fff}

    .footer{background:#0d1a2d;color:#b9c9dc;padding:58px 0 24px}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:38px}
    .footer-brand strong{display:block;color:#fff;font-size:20px;margin-bottom:13px}
    .footer p{margin:0 0 8px;font-size:13px;line-height:1.8}
    .footer h3{margin:0 0 15px;color:#fff;font-size:15px}
    .footer-grid>div:not(.footer-brand) a,.footer-grid>div:not(.footer-brand) span{display:block;margin:7px 0;color:#b9c9dc;font-size:13px}
    .footer-grid a:hover{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:42px;padding-top:20px;border-top:1px solid rgba(255,255,255,.12);font-size:12px;color:#8498b1}

    @media (max-width:980px){
      .main-nav{display:none}
      .hamburger{display:block}
      .member-btn{display:none}
      .intro-grid,.trust-box{grid-template-columns:1fr;gap:35px}
      .capability-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media (max-width:640px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{min-height:44px;display:block;padding:7px 0;font-size:11px}
      .topbar a{margin-left:10px}
      .header-inner{height:67px;gap:12px}
      .logo{min-width:0;font-size:16px}
      .logo img{width:32px;height:32px}
      .open-btn{padding:8px 10px;font-size:12px}
      .about-hero{padding:65px 0 70px}
      .about-hero p{font-size:16px}
      .about-intro,.capabilities,.timeline-section,.trust-section{padding:62px 0}
      .capability-grid{grid-template-columns:1fr}
      .timeline:before{left:8px}
      .timeline-item,.timeline-item:nth-child(even),.timeline-item:nth-child(odd){left:0;width:100%;padding:0 0 28px 35px;text-align:left}
      .timeline-item:nth-child(odd) .timeline-dot,.timeline-item:nth-child(even) .timeline-dot{left:2px;right:auto}
      .footer-grid{grid-template-columns:1fr 1fr;gap:28px 18px}
      .footer-brand{grid-column:1/-1}
      .footer-bottom{display:block}
      .footer-bottom span{display:block;margin-top:8px}
    }