:root{--blue:#0B3D91;--ink:#172235;--muted:#697386;--line:#e7eaf0;--paper:#f7f9fc;--gold:#d89b35;--dark:#111b2e}
    *{box-sizing:border-box}
    body{margin:0;color:var(--ink);background:#fff;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",Arial,sans-serif;line-height:1.65}
    a{color:inherit;text-decoration:none}
    img{max-width:100%;display:block}
    button{font:inherit}
    .container{width:min(1180px,calc(100% - 40px));margin:auto}
    .topbar{background:var(--dark);color:#dbe5f5;font-size:13px}
    .topbar-inner{min-height:36px;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{height:76px;display:flex;align-items:center;gap:30px}
    .logo{display:flex;align-items:center;gap:10px;color:var(--dark);font-size:19px;font-weight:800;white-space:nowrap}
    .logo img{width:34px;height:34px;object-fit:contain}
    .main-nav{flex:1}.nav-list{display:flex;align-items:center;justify-content:center;gap:4px;list-style:none;margin:0;padding:0}
    .nav-item{position:relative}.nav-link{display:block;padding:25px 13px;font-size:15px;font-weight:600;white-space:nowrap}
    .nav-link:hover{color:var(--blue)}
    .has-arrow:after{content:"⌄";margin-left:6px;font-size:12px}
    .dropdown-panel,.mega-menu{position:absolute;top:calc(100% + 1px);left:50%;transform:translateX(-50%);width:290px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;box-shadow:0 18px 45px rgba(17,27,46,.14);opacity:0;visibility:hidden;pointer-events:none;transition:.2s}
    .dropdown-panel a{display:block;padding:9px 2px;border-bottom:1px solid #f0f2f6;font-size:14px}
    .dropdown-panel .dropdown-all,.mega-footer{display:block;margin-top:14px;color:var(--blue);font-weight:700}
    .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}
    .mega-menu{width:650px}.mega-wide{width:900px}.mega-title{margin:0 0 14px;font-size:16px;color:var(--dark)}
    .mega-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
    .mega-card{min-width:0;padding:12px;border:1px solid var(--line);border-radius:10px;background:#fbfcfe}
    .mega-card img{width:30px;height:30px;object-fit:contain;margin-bottom:7px}
    .mega-card .video-thumb,.mega-card .product-thumb{width:100%;height:70px;object-fit:cover;border-radius:7px}
    .mega-card strong{display:block;font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
    .mega-card p{margin:5px 0 0;color:var(--muted);font-size:11px;line-height:1.45}
    .mega-meta{display:flex;justify-content:space-between;gap:5px;color:var(--muted);font-size:11px}
    .mega-columns{display:grid;grid-template-columns:150px 1fr;gap:22px}.mega-categories a{display:block;padding:6px 0;color:var(--muted);font-size:13px}
    .header-btns{display:flex;align-items:center;gap:12px}.account-btn{padding:9px 15px;border-radius:7px;background:var(--blue);color:#fff;font-size:13px;font-weight:700}
    .hamburger{display:none;border:0;background:transparent;padding:7px;cursor:pointer}.hamburger span{display:block;width:24px;height:2px;margin:5px 0;background:var(--dark);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(10,18,32,.5);opacity:0;visibility:hidden;z-index:30;transition:.2s}.drawer-overlay.open{opacity:1;visibility:visible}
    .mobile-drawer{position:fixed;top:0;right:-360px;width:min(360px,90vw);height:100vh;overflow:auto;background:#fff;z-index:31;transition:.25s;box-shadow:-12px 0 35px rgba(0,0,0,.14)}
    .mobile-drawer.open{right:0}.drawer-head{display:flex;align-items:center;gap:14px;padding:20px;border-bottom:1px solid var(--line);font-weight:700}.drawer-head>a{margin-left:auto;color:var(--blue)}
    .drawer-close{border:0;background:transparent;font-size:28px;line-height:1;cursor:pointer;color:var(--muted)}.drawer-menu{padding:12px 20px}
    .drawer-link,.drawer-toggle{display:block;width:100%;padding:13px 0;border:0;border-bottom:1px solid var(--line);background:transparent;text-align:left;font-weight:600;color:var(--ink);cursor:pointer}
    .drawer-toggle:after{content:"＋";float:right;color:var(--muted)}.drawer-toggle.active:after{content:"－"}
    .drawer-submenu{display:none;padding:4px 0 8px 16px}.drawer-submenu.open{display:block}.drawer-submenu a{display:block;padding:8px 0;color:var(--muted);font-size:14px}
    .download-page-main{background:var(--paper);padding:58px 0 80px}.download-hero{text-align:center;max-width:760px;margin:0 auto 38px}
    .eyebrow{display:inline-block;color:var(--blue);font-size:13px;font-weight:800;letter-spacing:.12em;margin-bottom:10px}
    .download-hero h1{margin:0;font-size:clamp(32px,5vw,54px);line-height:1.18;color:var(--dark)}
    .download-hero p{margin:18px auto 0;color:var(--muted);font-size:17px}
    .download-actions{display:flex;justify-content:center;gap:12px;flex-wrap:wrap;margin-top:25px}.primary-btn,.ghost-btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 22px;border-radius:8px;font-weight:700}
    .primary-btn{background:var(--blue);color:#fff}.ghost-btn{border:1px solid #cbd4e2;background:#fff;color:var(--blue)}
    .download-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:28px}.download-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:25px;box-shadow:0 8px 24px rgba(17,27,46,.05)}
    .download-number{width:38px;height:38px;border-radius:50%;display:grid;place-items:center;background:#eaf0fb;color:var(--blue);font-weight:800}.download-card h2{font-size:19px;margin:16px 0 8px}.download-card p{margin:0;color:var(--muted);font-size:14px}
    .download-card ul{margin:15px 0 0;padding-left:20px;color:var(--muted);font-size:14px}.download-card li{margin:5px 0}
    .platform-panel{display:grid;grid-template-columns:1fr 1fr;gap:22px;align-items:center;background:var(--dark);color:#fff;border-radius:18px;padding:32px;margin-top:28px}.platform-panel h2{margin:0 0 8px;font-size:26px}.platform-panel p{margin:0;color:#bdc8da}.platform-list{display:grid;grid-template-columns:1fr 1fr;gap:10px}.platform-item{padding:14px;border:1px solid rgba(255,255,255,.16);border-radius:10px;background:rgba(255,255,255,.06)}.platform-item strong{display:block}.platform-item span{font-size:12px;color:#bdc8da}
    .faq-section{margin-top:55px}.section-heading{text-align:center;margin-bottom:22px}.section-heading h2{margin:0;font-size:28px;color:var(--dark)}.section-heading p{color:var(--muted);margin:7px 0}
    .faq-list{max-width:850px;margin:auto;display:grid;gap:10px}.faq-item{background:#fff;border:1px solid var(--line);border-radius:10px;padding:17px 20px}.faq-item h3{font-size:16px;margin:0 0 5px}.faq-item p{margin:0;color:var(--muted);font-size:14px}
    .footer{background:var(--dark);color:#c5cfde;padding:48px 0 20px}.footer .logo{color:#fff}.footer-main{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:35px}.footer h3{margin:0 0 15px;color:#fff;font-size:15px}.footer-brand p{font-size:13px;color:#aab7ca}.footer-links{display:grid;gap:8px;font-size:13px}.footer-links a:hover,.footer-contact a:hover{color:#fff}.footer-contact p{margin:7px 0;font-size:13px}.footer-bottom{display:flex;justify-content:space-between;gap:20px;border-top:1px solid rgba(255,255,255,.12);margin-top:35px;padding-top:18px;font-size:12px;color:#8f9db2}
    @media(max-width:1050px){.main-nav{display:none}.hamburger{display:block}.header-inner{justify-content:space-between}.header-btns{margin-left:auto}.download-grid{grid-template-columns:repeat(3,1fr)}}
    @media(max-width:760px){.container{width:min(100% - 28px,1180px)}.topbar-inner{padding:8px 0;align-items:flex-start;flex-direction:column;gap:2px}.topbar-contact{gap:12px}.header-inner{height:66px}.logo{font-size:17px}.account-btn{padding:8px 10px}.download-page-main{padding:40px 0 60px}.download-hero p{font-size:15px}.download-grid,.platform-panel{grid-template-columns:1fr}.platform-list{grid-template-columns:1fr 1fr}.footer-main{grid-template-columns:1fr 1fr;gap:28px}.footer-brand{grid-column:1/-1}.footer-bottom{flex-direction:column;gap:5px}.mega-menu,.dropdown-panel{display:none}}
    @media(max-width:480px){.header-btns{gap:5px}.account-btn{font-size:12px}.download-grid{grid-template-columns:1fr}.platform-panel{padding:23px}.platform-list{grid-template-columns:1fr}.footer-main{grid-template-columns:1fr}.footer-brand{grid-column:auto}}