:root{
  --theme:#0B3D91;
  --theme-deep:#071d49;
  --ink:#10213d;
  --muted:#64748b;
  --line:#dbe4f0;
  --soft:#f4f7fb;
  --white:#fff;
  --accent:#3e82e8;
  --shadow:0 18px 55px rgba(10,42,92,.12);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;color:var(--ink);background:#f8fafc;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","微软雅黑",Arial,sans-serif;line-height:1.65}
a{color:inherit;text-decoration:none}
button{font:inherit}
img{max-width:100%;display:block}
.container{width:min(1180px,calc(100% - 40px));margin:0 auto}


.topbar{background:#071d49;color:#dbeafe;font-size:13px}
.topbar .container{min-height:38px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.topbar a{color:#e7f0ff;margin-left:20px;transition:color .2s}
.topbar a:hover{color:#fff}


.header{position:relative;z-index:20;background:#fff;border-bottom:1px solid #e8eef6}
.header-inner{min-height:78px;display:flex;align-items:center;gap:30px}
.logo{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto;color:var(--theme);font-size:20px;font-weight:800;letter-spacing:.02em}
.logo img{width:38px;height:38px;object-fit:contain}
.main-nav{flex:1}
.nav-list{display:flex;align-items:stretch;justify-content:center;gap:3px;list-style:none;margin:0;padding:0}
.nav-item{position:relative}
.nav-link{display:flex;align-items:center;min-height:78px;padding:0 14px;color:#263752;font-size:15px;font-weight:600;white-space:nowrap}
.nav-link:hover,.nav-link:focus{color:var(--theme)}
.has-arrow:after{content:"";width:6px;height:6px;margin:0 0 3px 8px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg)}
.dropdown-panel,.mega-menu{position:absolute;top:calc(100% - 1px);left:50%;width:330px;padding:22px;background:#fff;border:1px solid #e4ebf4;border-radius:0 0 16px 16px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transform:translate(-50%,8px);transition:.2s ease}
.mega-menu{width:560px}
.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;left:0;right:0;top:-14px;height:14px}
.panel-title{margin:0 0 14px;color:var(--theme);font-size:16px;font-weight:800}
.panel-list{display:grid;gap:4px}
.panel-list a{display:block;padding:9px 10px;border-radius:8px;color:#41516a;font-size:14px}
.panel-list a:hover{background:#eef5ff;color:var(--theme)}
.mega-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.mega-card{display:block;padding:13px;border:1px solid #e4ebf4;border-radius:11px;background:#fbfdff;transition:.2s}
.mega-card:hover{border-color:#8eb7f0;box-shadow:0 8px 20px rgba(11,61,145,.08)}
.mega-card strong{display:flex;align-items:center;gap:7px;color:#1b3153;font-size:14px;line-height:1.4}
.mega-card strong img{width:22px;height:22px;object-fit:contain;border-radius:5px}
.mega-card small{display:block;margin-top:7px;color:#718096;font-size:12px;line-height:1.45}
.mega-footer{display:inline-block;margin-top:17px;color:var(--theme);font-size:13px;font-weight:700}
.header-btns{display:flex;align-items:center;gap:10px;white-space:nowrap}
.member-btn,.open-btn{padding:9px 14px;border-radius:8px;font-size:13px;font-weight:700}
.member-btn{color:var(--theme);background:#edf4ff}
.open-btn{color:#fff;background:var(--theme)}
.member-btn:hover{background:#dfeeff}
.open-btn:hover{background:#082f70}
.hamburger{display:none;width:42px;height:40px;padding:8px;border:1px solid #dbe4f0;border-radius:8px;background:#fff;cursor:pointer}
.hamburger span{display:block;width:22px;height:2px;margin:4px auto;background:var(--theme);transition:.2s}
.hamburger.active span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.hamburger.active span:nth-child(2){opacity:0}
.hamburger.active span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}


.drawer-overlay{position:fixed;inset:0;z-index:40;background:rgba(3,15,38,.48);opacity:0;visibility:hidden;transition:.25s}
.drawer-overlay.open{opacity:1;visibility:visible}
.mobile-drawer{position:fixed;z-index:50;top:0;right:0;width:min(390px,88vw);height:100vh;overflow:auto;background:#fff;transform:translateX(105%);transition:transform .3s ease;box-shadow:-15px 0 45px rgba(2,20,52,.2)}
.mobile-drawer.open{transform:translateX(0)}
.drawer-head{display:flex;align-items:center;gap:12px;padding:20px;border-bottom:1px solid var(--line);color:var(--theme);font-weight:800}
.drawer-head span{flex:1}
.drawer-head a{padding:7px 12px;border-radius:6px;background:var(--theme);color:#fff;font-size:13px}
.drawer-close{width:32px;height:32px;border:0;background:transparent;color:#506078;font-size:27px;cursor:pointer}
.drawer-menu{padding:12px 20px 30px}
.drawer-link,.drawer-toggle{display:block;width:100%;padding:14px 0;border:0;border-bottom:1px solid #edf1f6;background:none;text-align:left;color:#233752;font-weight:700;cursor:pointer}
.drawer-toggle:after{content:"+";float:right;color:var(--theme);font-size:20px;font-weight:400}
.drawer-toggle.active:after{content:"−"}
.drawer-submenu{max-height:0;overflow:hidden;padding-left:14px;transition:max-height .25s ease}
.drawer-submenu.open{max-height:600px}
.drawer-submenu a{display:block;padding:10px 0;color:#617087;font-size:14px}


.download-page-main{overflow:hidden}
.download-hero{padding:82px 0 70px;background:linear-gradient(135deg,#f7fbff 0%,#eef5ff 50%,#fff 100%);border-bottom:1px solid #e7eef8}
.download-intro{text-align:center;max-width:780px;margin:0 auto}
.download-kicker{display:inline-flex;align-items:center;gap:8px;padding:7px 13px;border-radius:999px;background:#e7f0ff;color:var(--theme);font-size:13px;font-weight:800;letter-spacing:.04em}
.download-kicker:before{content:"";width:7px;height:7px;border-radius:50%;background:#3e82e8}
.download-intro h1{margin:20px 0 15px;color:#0b2148;font-size:clamp(34px,5vw,58px);line-height:1.12;letter-spacing:-.04em}
.download-intro p{margin:0 auto;color:#60718a;font-size:17px;max-width:650px}
.download-actions{display:flex;justify-content:center;gap:12px;flex-wrap:wrap;margin-top:28px}
.primary-action,.secondary-action{display:inline-flex;align-items:center;justify-content:center;min-width:142px;padding:13px 22px;border-radius:9px;font-weight:800}
.primary-action{background:var(--theme);color:#fff;box-shadow:0 10px 22px rgba(11,61,145,.2)}
.secondary-action{border:1px solid #b8cae2;background:#fff;color:var(--theme)}
.primary-action:hover{background:#082f70}
.secondary-action:hover{border-color:var(--theme);background:#f5f9ff}
.download-shell{padding:68px 0 84px}
.section-heading{text-align:center;margin-bottom:32px}
.section-heading h2{margin:0 0 8px;color:#102b55;font-size:30px}
.section-heading p{margin:0;color:var(--muted)}
.download-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.step-card{position:relative;padding:29px 25px;background:#fff;border:1px solid #e1e9f3;border-radius:16px;box-shadow:0 8px 26px rgba(16,47,92,.06)}
.step-number{display:inline-flex;width:38px;height:38px;align-items:center;justify-content:center;border-radius:50%;background:#e8f1ff;color:var(--theme);font-weight:900}
.step-card h3{margin:18px 0 8px;font-size:19px;color:#17345f}
.step-card p{margin:0;color:#66758a;font-size:14px}
.download-panel{display:grid;grid-template-columns:1fr 1fr;gap:26px;margin-top:52px}
.platform-card,.faq-card{padding:30px;background:#fff;border:1px solid #e1e9f3;border-radius:16px}
.platform-card h2,.faq-card h2{margin:0 0 20px;color:#17345f;font-size:23px}
.platform-list{display:grid;gap:13px}
.platform-item{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:15px;border:1px solid #e7edf5;border-radius:11px;background:#fbfdff}
.platform-info{display:flex;align-items:center;gap:12px}
.platform-icon{display:grid;place-items:center;width:38px;height:38px;border-radius:9px;background:#eaf2ff;color:var(--theme);font-size:18px;font-weight:900}
.platform-info strong{display:block;color:#244264;font-size:15px}
.platform-info small{display:block;color:#7b899c;font-size:12px}
.platform-link{color:var(--theme);font-size:13px;font-weight:800}
.faq-list{display:grid;gap:0}
.faq-item{padding:15px 0;border-bottom:1px solid #e8eef5}
.faq-item:last-child{border-bottom:0}
.faq-item h3{margin:0 0 5px;color:#294566;font-size:15px}
.faq-item p{margin:0;color:#718096;font-size:13px}
.download-notice{margin-top:25px;padding:18px 20px;border-left:4px solid #3e82e8;border-radius:8px;background:#eef5ff;color:#4c6280;font-size:13px}


.footer{background:#071d49;color:#cbd8eb}
.footer .container{padding-top:54px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:35px;padding-bottom:42px}
.footer-brand strong{display:block;margin-bottom:13px;color:#fff;font-size:20px}
.footer p{margin:0 0 10px;color:#aebed5;font-size:13px}
.footer h3{margin:0 0 14px;color:#fff;font-size:15px}
.footer-grid>div:not(.footer-brand) a{display:block;margin:8px 0;color:#aebed5;font-size:13px}
.footer-grid>div a:hover{color:#fff}
.footer-bottom{display:flex;justify-content:space-between;gap:20px;padding:20px 0;border-top:1px solid rgba(255,255,255,.14);color:#91a6c3;font-size:12px}


@media (max-width:1050px){
  .header-inner{gap:15px}
  .nav-link{padding:0 9px;font-size:14px}
  .member-btn{display:none}
}
@media (max-width:820px){
  .topbar .container{min-height:42px;font-size:12px}
  .topbar .container>span:last-child{display:flex;flex-direction:column;align-items:flex-end}
  .topbar a{margin-left:10px}
  .main-nav{display:none}
  .header-inner{min-height:68px}
  .header-btns{margin-left:auto}
  .hamburger{display:block}
  .download-hero{padding:60px 0 55px}
  .download-steps{grid-template-columns:1fr}
  .download-panel{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:560px){
  .container{width:min(100% - 28px,1180px)}
  .topbar .container>span:first-child{display:none}
  .topbar .container{justify-content:flex-end}
  .logo span{font-size:17px}
  .open-btn{display:none}
  .download-intro h1{font-size:37px}
  .download-intro p{font-size:15px}
  .download-shell{padding:52px 0 62px}
  .footer-grid{grid-template-columns:1fr;gap:25px;padding-bottom:30px}
  .footer-bottom{display:block}
  .footer-bottom span{display:block;margin:5px 0}
}