:root{
  --blue:#5865f2;
  --blue-dark:#4338ca;
  --line:#e5edf5;
}
*{box-sizing:border-box}
body{margin:0;background:#fff;color:#17324d;font-family:"Microsoft YaHei",Arial,sans-serif}
a{text-decoration:none;color:inherit}
.top{height:170px;display:flex;align-items:center;justify-content:center;position:relative;background:#fff}
.brand{position:absolute;left:6%;top:28px;font-size:22px;font-weight:700;color:#635bdb}
.search{display:flex;width:460px;height:46px}
.search input{flex:1;border:1px solid #cbd9e8;border-right:0;border-radius:6px 0 0 6px;padding:0 16px;font-size:15px;background:#fff}
.search button{width:74px;border:0;background:linear-gradient(135deg,#4f7cff,#8a57ed);color:#fff;font-size:0;border-radius:0 6px 6px 0;display:flex;align-items:center;justify-content:center;cursor:pointer}
.search button img{width:30px;height:30px;object-fit:contain;display:block}
.nav,.container{max-width:1120px;margin:auto}
.nav{height:62px;border-bottom:1px solid var(--line);display:flex;gap:44px;align-items:stretch;position:relative;z-index:5}
.nav a{display:flex;align-items:center;height:62px;padding:0 4px;color:#17324d;font-size:19px;border-bottom:2px solid transparent}
.nav>a.active,.nav-item>a.active{border-bottom-color:var(--blue);color:var(--blue)}
.nav-item{position:relative;display:flex;align-items:stretch}
.nav-item>a{display:flex;align-items:center;height:62px}
.nav-dropdown{position:absolute;left:0;top:calc(100% + 1px);width:190px;background:#fff;border:1px solid #e5edf5;border-left:5px solid var(--blue);box-shadow:0 4px 14px #5865f233;padding:10px 0;opacity:0;visibility:hidden;transform:translateY(8px);transition:.18s;z-index:20}
.nav-item:hover .nav-dropdown{opacity:1;visibility:visible;transform:translateY(0)}
.nav-dropdown a{display:block;padding:8px 18px;color:#4a4a4a;font-size:16px;white-space:nowrap;border:0;height:auto}
.nav-dropdown a:hover,.nav-dropdown a.active{color:var(--blue);background:#f1f3ff}
.nav-dropdown em{font-style:normal;color:#8a8a8a;margin-left:4px}
.mobile-pagebar,.mobile-category-grid{display:none}
.product-list{display:grid;grid-template-columns:1fr 1fr;gap:0 38px;padding-top:26px}
.card{height:106px;border-bottom:1px solid var(--line);display:flex;align-items:center;padding:10px 12px;transition:.25s;background:#fff}
.card:hover{background:#f3f5ff;box-shadow:0 4px 14px #5865f21a}
.thumb{width:82px;height:82px;display:flex;align-items:center;justify-content:center;background:#f5f8fb;margin-right:18px;flex:none;overflow:hidden}
.thumb img{max-width:100%;max-height:100%;object-fit:contain}
.thumb span{font-size:12px;color:#9aaabd}
.info{flex:1}
.info h3{margin:0 0 8px;font-size:17px;font-weight:500;color:#17324d}
.info small{color:#7b8da0}
.download-btn,.file-download{
  width:56px;height:56px;display:flex;align-items:center;justify-content:center;flex:none;
}
.detail-page{display:grid;grid-template-columns:1fr 360px;gap:48px;padding-top:30px}
.detail-title{color:#17324d;font-size:28px;font-weight:500;border-bottom:1px solid var(--line);padding-bottom:18px}
.file-list{margin-top:6px}
.file-row{display:grid;grid-template-columns:28px 1fr 160px 90px 56px;align-items:center;min-height:72px;border-bottom:1px solid var(--line);gap:10px}
.file-row input[type=checkbox]{width:22px;height:22px;accent-color:var(--blue)}
.file-name{font-size:18px}
.file-date,.file-size{color:#6c6c6c;font-size:15px}
.file-download{position:relative}
.select-all{padding:20px 0;display:flex;align-items:center;gap:18px;color:var(--blue-dark)}
.select-all input{width:22px;height:22px;accent-color:var(--blue)}
.select-all button{background:linear-gradient(135deg,#4f7cff,#7657e8);color:#fff;border:0;border-radius:6px;padding:8px 22px;font-size:15px;cursor:pointer}
.product-box{background:#fff;border-radius:16px;padding:30px;text-align:center;align-self:start}
.big-cover{height:280px;background:#fff;display:flex;align-items:center;justify-content:center;margin-bottom:20px;border-radius:6px;overflow:hidden}
.big-cover img{max-width:100%;max-height:100%;object-fit:contain}
.product-box strong{font-size:18px}
.empty{padding:60px;text-align:center;color:#8aa0b5}
[hidden]{display:none!important}
.download-btn img,.file-download img{width:34px;height:34px;object-fit:contain;display:block}
.file-download img{width:32px;height:32px}
@media(max-width:800px){
  .top{height:152px;justify-content:center}
  .brand{left:16px;top:18px;font-size:18px}
  .search{position:absolute;top:72px;width:92%;height:52px}
  .search button{width:86px}
  .nav{display:none}
  .mobile-pagebar{display:flex;align-items:center;justify-content:space-between;height:56px;background:linear-gradient(135deg,#4f7cff,#7657e8);color:#fff;padding:0 14px}
  .mobile-pagebar .mobile-title{flex:1;text-align:center;font-size:18px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .mobile-back,.mobile-menu{width:34px;height:34px;display:flex;align-items:center;justify-content:center;color:#fff;position:relative;flex:none}
  .mobile-back:before{content:"";width:14px;height:14px;border-left:3px solid #fff;border-bottom:3px solid #fff;transform:rotate(45deg);display:block}
  .mobile-menu{border:1px solid #d5d8df;border-radius:7px;background:#9aa0aa;cursor:pointer}
  .mobile-menu:before{content:"";position:absolute;left:8px;top:9px;width:4px;height:4px;background:#fff;box-shadow:0 6px 0 #fff,0 12px 0 #fff}
  .mobile-menu:after{content:"";position:absolute;left:16px;top:10px;width:11px;height:2px;background:#fff;box-shadow:0 6px 0 #fff,0 12px 0 #fff}
  .mobile-menu[aria-expanded="true"]{background:#7f8794}
  .mobile-category-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px 18px;padding:16px 18px 18px;background:#fff;border-bottom:1px solid var(--line)}
  .mobile-category-grid a{font-size:16px;color:#4b5563;white-space:nowrap}
  .mobile-category-grid em{font-style:normal;color:#8a8a8a;margin-left:4px}
  .product-list{grid-template-columns:1fr;gap:0;padding-top:0}
  .card{height:100px;padding:12px 16px}
  .thumb{width:84px;height:84px;margin-right:14px}
  .download-btn,.file-download{width:48px;height:48px}
  .download-btn img,.file-download img{width:32px;height:32px}
  .detail-page{grid-template-columns:1fr;gap:24px;padding:0 16px 0}
  .detail-title{display:none}
  .file-row{grid-template-columns:24px 1fr auto 48px;gap:8px;min-height:64px}
  .file-row .file-size{display:none}
  .file-row .file-date{font-size:13px}
  .file-row input[type=checkbox]{width:20px;height:20px}
  .file-name{font-size:16px}
  .product-box{order:-1;padding:18px}
  .big-cover{height:240px}
  .select-all{gap:12px}
  .select-all button{padding:8px 18px}
}