:root{
      --theme:#0B3D91;
      --theme-deep:#07295f;
      --theme-light:#e9f2ff;
      --ink:#10233f;
      --muted:#63738c;
      --line:#dbe4ef;
      --surface:#fff;
      --soft:#f5f8fc;
      --accent:#13a6a0;
      --shadow:0 18px 50px rgba(16,35,63,.10);
      --radius:8px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      color:var(--ink);
      background:#fff;
      font-family:-apple-system,BlinkMacSystemFont,"Noto Sans TC","PingFang TC","Microsoft JhengHei",sans-serif;
      line-height:1.7;
    }
    a{color:inherit;text-decoration:none}
    img{max-width:100%;display:block}
    button,input{font:inherit}
    .container{width:min(1180px,calc(100% - 40px));margin:0 auto}

    .topbar{background:#071b3b;color:#dce9ff;font-size:13px}
    .topbar .container{min-height:38px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .topbar-contact{display:flex;gap:22px}
    .topbar a:hover{color:#fff}

    .header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
    .header-inner{min-height:76px;display:flex;align-items:center;gap:28px}
    .logo{display:inline-flex;align-items:center;gap:10px;color:var(--theme);font-weight:800;white-space:nowrap}
    .logo img{width:34px;height:34px;object-fit:contain}
    .main-nav{margin-left:auto}
    .nav-list{display:flex;align-items:stretch;gap:4px;margin:0;padding:0;list-style:none}
    .nav-item{position:relative}
    .nav-link{display:flex;align-items:center;min-height:76px;padding:0 13px;font-size:15px;font-weight:650;white-space:nowrap}
    .nav-link:hover,.nav-link:focus-visible{color:var(--theme)}
    .has-arrow:after{content:"⌄";font-size:13px;margin-left:6px;transform:translateY(-2px)}
    .header-btns{display:flex;align-items:center;gap:12px}
    .member-slot{font-size:14px;color:var(--theme)}
    .open-account,.download-button{
      display:inline-flex;align-items:center;justify-content:center;
      min-height:42px;padding:0 18px;border-radius:6px;
      background:var(--theme);color:#fff;font-weight:700;
    }
    .open-account:hover,.download-button:hover{background:var(--theme-deep)}
    .hamburger{display:none;width:42px;height:42px;border:1px solid var(--line);background:#fff;border-radius:6px;padding:9px;cursor:pointer}
    .hamburger span{display:block;height:2px;margin:5px 0;background:var(--theme);transition:.2s}
    .hamburger.active span:first-child{transform:translateY(7px) rotate(45deg)}
    .hamburger.active span:nth-child(2){opacity:0}
    .hamburger.active span:last-child{transform:translateY(-7px) rotate(-45deg)}

    .dropdown-panel,.mega-menu{
      position:absolute;top:calc(100% + 1px);left:50%;z-index:30;
      width:340px;padding:22px;background:#fff;border:1px solid var(--line);
      box-shadow:var(--shadow);opacity:0;visibility:hidden;transform:translate(-50%,8px);
      transition:opacity .2s,transform .2s,visibility .2s;
    }
    .mega-menu{width:min(780px,calc(100vw - 40px))}
    .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:translate(-50%,0)
    }
    .dropdown-panel:before,.mega-menu:before{
      content:"";position:absolute;top:-14px;left:0;right:0;height:14px;
    }
    .dropdown-heading,.mega-head{margin:0 0 16px}
    .dropdown-heading{font-weight:800;color:var(--theme)}
    .dropdown-panel>a:not(.dropdown-all){display:block;padding:8px 0;border-bottom:1px solid var(--line);font-size:14px}
    .dropdown-panel>a:hover,.mega-category-list a:hover{color:var(--theme)}
    .dropdown-all,.mega-footer{display:block;margin-top:15px;color:var(--theme);font-size:14px;font-weight:750}
    .mega-head{display:flex;align-items:baseline;justify-content:space-between;gap:18px}
    .mega-head strong{font-size:17px}
    .mega-head span{color:var(--muted);font-size:13px}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
    .mega-card{min-width:0;padding:12px;border:1px solid var(--line);border-radius:6px;background:#fff}
    .mega-card:hover{border-color:#9bb9e5;box-shadow:0 6px 18px rgba(11,61,145,.09)}
    .mega-card img{width:34px;height:34px;object-fit:contain;margin-bottom:8px}
    .mega-card strong{display:block;font-size:14px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
    .mega-card p{margin:5px 0 0;color:var(--muted);font-size:12px;line-height:1.5}
    .mega-meta{display:flex;flex-wrap:wrap;gap:4px 8px;margin-top:7px;color:var(--muted);font-size:11px}
    .mega-category-list{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:15px}
    .mega-category-list a{padding:5px 10px;border:1px solid var(--line);border-radius:999px;font-size:12px}

    .drawer-overlay{position:fixed;inset:0;z-index:40;background:rgba(2,17,38,.45);opacity:0;visibility:hidden;transition:.2s}
    .mobile-drawer{position:fixed;top:0;right:0;bottom:0;z-index:50;width:min(390px,88vw);background:#fff;overflow:auto;transform:translateX(100%);transition:transform .25s;box-shadow:-16px 0 40px rgba(0,0,0,.18)}
    .mobile-drawer.open{transform:translateX(0)}
    .drawer-overlay.open{opacity:1;visibility:visible}
    .drawer-head{display:flex;align-items:center;gap:12px;padding:18px 20px;border-bottom:1px solid var(--line)}
    .drawer-member{margin-right:auto;color:var(--theme)}
    .drawer-head>a{color:var(--theme);font-weight:700;font-size:14px}
    .drawer-close{border:0;background:transparent;font-size:28px;line-height:1;color:var(--muted);cursor:pointer}
    .drawer-menu{padding:12px 20px 30px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 0;border:0;border-bottom:1px solid var(--line);background:none;text-align:left;color:var(--ink);font-weight:700;cursor:pointer}
    .drawer-toggle:after{content:"＋";float:right;color:var(--theme)}
    .drawer-toggle.active:after{content:"－"}
    .drawer-submenu{display:none;padding:4px 0 8px 14px}
    .drawer-submenu.open{display:block}
    .drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:14px}

    .download-page-main{background:var(--soft)}
    .download-hero{padding:76px 0 62px;background:linear-gradient(145deg,#edf5ff 0%,#fff 70%);border-bottom:1px solid var(--line)}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;margin:0 0 13px;color:var(--theme);font-size:13px;font-weight:800;letter-spacing:.08em}
    .eyebrow:before{content:"";width:28px;height:2px;background:var(--accent)}
    .download-hero h1{max-width:760px;margin:0;font-size:clamp(34px,5vw,60px);line-height:1.15;letter-spacing:0}
    .download-hero .lead{max-width:670px;margin:20px 0 28px;color:var(--muted);font-size:18px}
    .hero-actions{display:flex;flex-wrap:wrap;align-items:center;gap:14px}
    .secondary-button{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:0 18px;border:1px solid #9cb7da;border-radius:6px;color:var(--theme);font-weight:700;background:#fff}
    .secondary-button:hover{border-color:var(--theme);background:var(--theme-light)}
    .download-note{margin:12px 0 0;color:var(--muted);font-size:13px}

    .download-section{padding:64px 0}
    .section-heading{display:flex;justify-content:space-between;align-items:end;gap:25px;margin-bottom:26px}
    .section-heading h2{margin:0;font-size:30px;line-height:1.25}
    .section-heading p{max-width:500px;margin:0;color:var(--muted)}
    .download-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .step-card{padding:25px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 8px 24px rgba(16,35,63,.05)}
    .step-number{display:flex;align-items:center;justify-content:center;width:36px;height:36px;margin-bottom:18px;border-radius:50%;background:var(--theme);color:#fff;font-weight:800}
    .step-card h3{margin:0 0 8px;font-size:19px}
    .step-card p{margin:0;color:var(--muted);font-size:15px}
    .platform-panel{display:grid;grid-template-columns:1fr auto;align-items:center;gap:30px;padding:28px 32px;background:var(--theme-deep);color:#fff;border-radius:var(--radius)}
    .platform-panel h2{margin:0 0 8px;font-size:25px}
    .platform-panel p{margin:0;color:#cbdafa}
    .platform-panel .download-button{background:#fff;color:var(--theme)}
    .platform-panel .download-button:hover{background:#e5efff}
    .faq-list{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    .faq-item{padding:20px 22px;background:#fff;border:1px solid var(--line);border-radius:var(--radius)}
    .faq-item h3{margin:0 0 8px;font-size:17px}
    .faq-item p{margin:0;color:var(--muted);font-size:14px}

    .footer{background:#071b3b;color:#cbdafa;padding:54px 0 20px}
    .footer .logo{color:#fff}
    .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.15fr;gap:38px}
    .footer-brand p{max-width:330px;margin:18px 0;color:#9fb3d3;font-size:14px}
    .footer h3{margin:0 0 15px;color:#fff;font-size:15px}
    .footer-links{display:grid;gap:8px;font-size:14px}
    .footer-links a:hover,.footer-contact a:hover{color:#fff}
    .footer-contact{display:grid;gap:8px;font-size:14px}
    .footer-social{color:#fff}
    .footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:42px;padding-top:18px;border-top:1px solid rgba(203,218,250,.2);color:#91a7c9;font-size:13px}
    .footer-legal{display:flex;gap:18px}
    .footer-legal a:hover{color:#fff}

    @media (max-width:900px){
      .main-nav{display:none}
      .hamburger{display:block}
      .member-slot{display:none}
      .header-inner{justify-content:space-between}
      .header-btns{margin-left:auto}
      .mega-grid{grid-template-columns:repeat(2,1fr)}
      .footer-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media (max-width:680px){
      .container{width:min(100% - 28px,1180px)}
      .topbar .container{align-items:flex-start;flex-direction:column;gap:2px;padding:8px 0}
      .topbar-contact{flex-wrap:wrap;gap:4px 14px}
      .header-inner{min-height:66px}
      .open-account{min-height:38px;padding:0 11px;font-size:13px}
      .download-hero{padding:52px 0 44px}
      .download-hero .lead{font-size:16px}
      .download-section{padding:44px 0}
      .section-heading{display:block}
      .section-heading p{margin-top:10px}
      .download-steps,.faq-list{grid-template-columns:1fr}
      .platform-panel{grid-template-columns:1fr;padding:24px}
      .platform-panel .download-button{justify-self:start}
      .footer-grid{grid-template-columns:1fr;gap:28px}
      .footer-bottom{display:block}
      .footer-legal{margin-top:12px;flex-wrap:wrap}
      .mega-menu{left:auto;right:0;transform:translate(0,8px)}
      .nav-item:hover>.mega-menu,.nav-item:focus-within>.mega-menu{transform:translate(0,0)}
    }