/* ================================================================
   LANDPACK V4 CHROME — B2 导航 + 页脚（2026-10-12 批H）
   作用域：.v4hd（顶部）/ .v4ft（页脚），零全局污染
   门控：模板内 <link media="only screen and (min-width:1237px)">
   数据：栏目/系列/台数全部后台实时口径；53kf/百度统计不在此文件
================================================================ */
.v4hd,.v4ft{
  --i25:#FAFDFF; --i50:#F3F9FE; --i100:#E9F4FC; --i150:#DDEBF8;
  --i200:#C9E2F4; --i300:#A3CEEE; --i400:#6FB0E0; --i500:#2F8CD0;
  --i600:#1B6FB4; --i700:#11598F; --i800:#0C4269; --i900:#082F4C;
  --mut:#7C94A9; --line:#E3EFF9;
}
.v4hd{position:sticky;top:-42px;z-index:900;font-family:inherit}
.v4hd *,.v4ft *{margin:0;padding:0;box-sizing:border-box}
.v4hd ul{list-style:none}
.v4hd a,.v4ft a{text-decoration:none;color:inherit}
.v4hd img,.v4ft img{display:block;max-width:100%}

/* ---------------- 顶条（深冰蓝 42px） ---------------- */
.v4hd .topbar{height:42px;background:linear-gradient(180deg,#0A3555,#082F4C);display:flex;align-items:center;justify-content:space-between;padding:0 max(56px,calc((100vw - 1584px) / 2));color:#B9D4E8;font-size:12.5px}
.v4hd .topbar .tb-l{display:flex;align-items:center;gap:18px}
.v4hd .topbar .tb-l .sub{display:inline-flex;align-items:center;gap:7px;color:#9FC0D8}
.v4hd .topbar .tb-l .sub:before{content:"";width:5px;height:5px;border-radius:50%;background:var(--i400);box-shadow:0 0 0 3px rgba(111,176,224,.18)}
.v4hd .topbar .tb-r{display:flex;align-items:center;gap:14px}
.v4hd .topbar a:hover{color:#fff}
.v4hd .topbar .spt{width:1px;height:14px;background:rgba(255,255,255,.16)}
.v4hd .topbar .hot{display:inline-flex;align-items:center;gap:8px;height:27px;padding:0 13px;border-radius:999px;background:rgba(255,255,255,.09);border:1px solid rgba(255,255,255,.14);color:#fff;font-weight:700;letter-spacing:.3px;transition:.2s}
.v4hd .topbar .hot:hover{background:rgba(255,255,255,.16);border-color:rgba(255,255,255,.24)}
.v4hd .topbar .hot svg{flex:none;color:#8CC0E8}
.v4hd .topbar .lang{display:inline-flex;align-items:center;gap:5px;font-weight:600}
.v4hd .topbar .lang b{color:#fff}
.v4hd .topbar .lang i{font-style:normal;color:#4E7CA6}
.v4hd .topbar .lang s{text-decoration:none;color:#7FA3C0}

/* ---------------- 主导航（白底磨砂 78px） ---------------- */
.v4hd .nav{height:78px;background:rgba(255,255,255,.96);backdrop-filter:blur(14px);display:grid;grid-template-columns:1fr auto auto;column-gap:56px;align-items:center;padding:0 max(56px,calc((100vw - 1584px) / 2));border-bottom:1px solid var(--line);position:relative;z-index:50}
.v4hd .nav .lg{display:flex;align-items:center;flex:none;justify-self:start}
.v4hd .nav .lg .lglogo{height:46px;width:auto}
.v4hd .nav .mn{display:flex;align-items:stretch;gap:2px;height:78px}
.v4hd .nav .mn>a,.v4hd .nav .mn .mi>a{display:flex;align-items:center;position:relative;padding:0 16px;font-size:15px;color:#2E4E6B;font-weight:600;letter-spacing:.2px;white-space:nowrap;border-radius:10px;transition:background .2s,color .2s}
.v4hd .nav .mn>a:hover,.v4hd .nav .mn .mi>a:hover{color:var(--i700);background:var(--i50)}
.v4hd .nav .mn>a.on,.v4hd .nav .mn .mi>a.on{color:var(--i600)}
.v4hd .nav .mn>a.on:after,.v4hd .nav .mn .mi>a.on:after{content:"";position:absolute;left:16px;right:16px;bottom:0;height:3px;border-radius:3px 3px 0 0;background:linear-gradient(90deg,var(--i400),var(--i600));box-shadow:0 3px 10px -2px rgba(47,140,208,.6)}
.v4hd .nav .mn a .dt{font-size:0;margin-left:5px;color:var(--i300);display:inline-flex;transition:transform .25s}
.v4hd .nav .mn a .dt svg{width:12px;height:12px}
.v4hd .nav .mn .mi{display:flex;align-items:stretch}
.v4hd .nav .mn .mi:hover>a{color:var(--i700);background:var(--i50)}
.v4hd .nav .mn .mi:hover>a .dt{transform:rotate(180deg)}
.v4hd .nav .nr{justify-self:end;display:flex;align-items:center;gap:14px}
.v4hd .nav .srch{height:42px;padding:0 16px;gap:9px;border-radius:999px;border:1px solid var(--i150);display:inline-flex;align-items:center;color:#8298AC;background:var(--i25);font-size:13px;font-weight:500;transition:.2s;white-space:nowrap}
.v4hd .nav .srch:hover{border-color:var(--i300);background:#fff;color:var(--i600)}
.v4hd .nav .srch svg{flex:none}
.v4hd .nav .btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;height:38px;padding:0 18px;border-radius:8px;font-size:13.5px;font-weight:600;transition:.22s;white-space:nowrap}
.v4hd .nav .btn-p{background:linear-gradient(180deg,#2E8AD0,var(--i700));color:#fff;box-shadow:0 12px 26px -13px rgba(17,89,143,.6),inset 0 1px 0 rgba(255,255,255,.2)}
.v4hd .nav .btn-p:hover{transform:translateY(-1px);box-shadow:0 18px 34px -15px rgba(17,89,143,.66)}
.v4hd .nav .btn .ar{display:inline-flex;align-items:center;transition:.2s}
.v4hd .nav .btn:hover .ar{transform:translateX(3px)}

/* ---------------- Mega 面板（产品中心，全宽 3 列） ---------------- */
.v4hd .mega{position:absolute;left:0;right:0;top:100%;background:#fff;box-shadow:0 34px 68px -30px rgba(8,42,68,.30);border-top:1px solid var(--i100);opacity:0;visibility:hidden;transform:translateY(-8px);transition:opacity .22s ease,transform .22s ease,visibility .22s}
.v4hd .mega:before{content:"";position:absolute;left:0;top:0;right:0;height:2px;background:linear-gradient(90deg,var(--i400),var(--i600) 30%,var(--i400) 60%,transparent)}
.v4hd .mn .mi:hover .mega{opacity:1;visibility:visible;transform:translateY(0)}
.v4hd .mega-cols{columns:3;column-gap:72px;padding:40px 72px 4px}
.v4hd .mgr{break-inside:avoid;-webkit-column-break-inside:avoid;padding-bottom:21px;border-bottom:1px solid #EEF5FB;margin-bottom:25px}
.v4hd .mgr:last-child{border-bottom:none}
.v4hd .mgr-t{display:inline-flex;align-items:center;gap:7px;font-size:16.5px;font-weight:800;color:var(--i600);letter-spacing:.2px}
.v4hd .mgr-t:hover{color:var(--i700)}
.v4hd .mgr-t .gt{font-size:13px;color:var(--i400);font-weight:400;display:inline-flex;align-items:center}
.v4hd .mgr-t .cnt{font-size:11.5px;color:var(--i400);font-weight:600;background:var(--i50);border:1px solid var(--i100);padding:1px 8px;border-radius:999px;transform:translateY(-1px);white-space:nowrap}
.v4hd .mgr-i{display:flex;flex-wrap:wrap;gap:4px 26px;margin-top:11px;min-height:2px}
.v4hd .mgr-i a{font-size:13.5px;color:#5B7992;transition:.18s}
.v4hd .mgr-i a:hover{color:var(--i600)}
.v4hd .mega-ft{display:flex;align-items:center;justify-content:space-between;margin:6px 72px 0;padding:19px 0 21px;border-top:1px dashed var(--i200);font-size:13.5px;color:var(--mut)}
.v4hd .mega-ft b{color:var(--i600);font-weight:700}
.v4hd .mega-ft .mf-r{color:var(--i600);font-weight:700;display:inline-flex;align-items:center;gap:7px}
.v4hd .mega-ft .mf-r:hover{color:var(--i700)}

/* ---------------- 吸顶收窄态（78 → 62px） ---------------- */
.v4hd .nav.narrow{height:62px;box-shadow:0 18px 38px -26px rgba(8,42,68,.4)}
.v4hd .nav.narrow .mn{height:62px}
.v4hd .nav.narrow .mn>a,.v4hd .nav.narrow .mn .mi>a{padding:0 15px;font-size:14px}
.v4hd .nav.narrow .srch{display:none}
.v4hd .nav.narrow .lg .lglogo{height:38px}

/* ---------------- 页脚（深冰蓝四栏） ---------------- */
.v4ft{margin-top:0}
.v4ft .ft{background:var(--i900);color:#A9C6DD}
.v4ft .ft-t{display:grid;grid-template-columns:1.35fr 1fr 1fr 1.15fr;gap:56px;padding:72px 72px 52px;border-bottom:1px solid rgba(255,255,255,.09)}
.v4ft .ft-lg b{display:block;font-size:21px;color:#fff;font-weight:900;letter-spacing:.5px}
.v4ft .ft-lg span{display:block;font-size:10.5px;letter-spacing:2.8px;color:#6E93B2;font-weight:600;margin-top:3px}
.v4ft .ft-lg p{font-size:13px;line-height:1.9;margin-top:18px;color:#8FB0CA}
.v4ft .ft-hot{margin-top:22px}
.v4ft .ft-hot .lb{font-size:12px;color:#7FA3C0}
.v4ft .ft-hot .no{font-size:24px;color:#fff;font-weight:800;letter-spacing:.5px;margin-top:2px}
.v4ft .ft-t h5{font-size:14.5px;color:#fff;font-weight:700;margin-bottom:20px;letter-spacing:.4px}
.v4ft .ft-t li{margin-bottom:11px;font-size:13.5px;line-height:1.7}
.v4ft .ft-t li a{transition:.18s}
.v4ft .ft-t li a:hover{color:#fff}
.v4ft .ft-t li.more a{color:#8CC0E8;font-weight:600}
.v4ft .ft-t .qr{width:118px;height:118px;border-radius:10px;background:#fff;padding:8px;margin-top:14px}
.v4ft .ft-t .qr img{width:100%;height:100%;object-fit:contain;border-radius:6px}
.v4ft .ft-b{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;padding:22px 72px;font-size:12.5px;color:#6E93B2}
.v4ft .ft-b a:hover{color:#fff}
.v4ft .ft-b .lnk span{margin:0 10px;color:#3D6280}

/* ---------------- 1237–1560px 中等宽度收窄 ---------------- */
@media only screen and (min-width:1237px) and (max-width:1560px){
  .v4hd .topbar{padding:0 26px}
  .v4hd .nav{padding:0 26px;column-gap:44px}
  .v4hd .nav .mn>a,.v4hd .nav .mn .mi>a{padding:0 12px;font-size:14.5px}
  .v4hd .mega-cols{column-gap:44px;padding:34px 40px 4px}
  .v4hd .mega-ft{margin:6px 40px 0}
  .v4ft .ft-t{grid-template-columns:1.2fr .9fr .9fr 1.1fr;gap:36px;padding:56px 40px 44px}
  .v4ft .ft-b{padding:20px 40px}
}