body:not(.en) .en{display:none!important}
body.en .zh{display:none!important}
nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.85);backdrop-filter:blur(12px);border-bottom:1px solid #e2e8f0}
nav .wrap{max-width:1120px;margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px;white-space:nowrap}
.logo .mark{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--accent,#334155),var(--accent-glow,#38bdf8));display:flex;align-items:center;justify-content:center;color:#fff}
.logo small{font-weight:400;color:#64748b;font-size:12px}
nav ul{display:flex;gap:28px;list-style:none;font-size:14px;color:#475569;white-space:nowrap}
nav ul li{display:flex;align-items:center}
nav ul a{padding:6px 2px;border-bottom:2px solid transparent;transition:.2s}
nav ul a:hover{color:var(--accent,#334155);border-color:var(--accent,#334155)}
.nav-cta{background:var(--accent,#334155);color:#fff!important;padding:9px 18px;border-radius:8px;font-weight:600}
.nav-cta:hover{background:var(--accent-strong,#0f172a)!important;border-color:transparent}
.burger{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:6px;margin-right:4px}
.burger span{display:block;width:22px;height:2.5px;background:#0f172a;border-radius:2px;transition:.25s}
.burger.on span:nth-child(1){transform:translateY(7.5px) rotate(45deg)}
.burger.on span:nth-child(2){opacity:0}
.burger.on span:nth-child(3){transform:translateY(-7.5px) rotate(-45deg)}
.lang{background:none;border:1px solid #e2e8f0;border-radius:8px;padding:7px 13px;font-size:13px;font-weight:600;color:#475569;cursor:pointer;transition:.2s;margin-right:10px}
.lang:hover{border-color:var(--accent,#334155);color:var(--accent,#334155)}
nav .drop{position:relative}
nav .drop::after{content:"";position:absolute;top:100%;left:12%;right:12%;height:14px}
nav .dropbtn{display:inline-flex;align-items:center;gap:5px}
nav .caret{width:0;height:0;border-left:4px solid transparent;border-right:4px solid transparent;border-top:5px solid currentColor;margin-left:5px;display:inline-block}
nav .dropmenu{display:none;position:absolute;top:calc(100% + 8px);left:50%;transform:translateX(-50%);background:#fff;border:1px solid #e2e8f0;border-radius:12px;box-shadow:0 14px 32px rgba(0,0,0,.12);padding:8px;min-width:240px;z-index:120}
nav .drop:hover .dropmenu{display:block}
nav .dropmenu a{display:flex;align-items:center;gap:12px;padding:9px 13px;border-radius:9px;border-bottom:none!important;font-size:13px;white-space:nowrap}
nav .dropmenu a:hover{background:#f8fafc;color:var(--accent,#334155);border-color:transparent}
nav .dropmenu b{display:block;font-size:13.5px}
nav .dropmenu small{display:block;font-size:11.5px;color:#64748b}
nav .dropmenu .mico{flex:none;width:34px;height:34px;border-radius:9px;display:flex;align-items:center;justify-content:center;color:#fff}
.mico-home{background:linear-gradient(135deg,#334155,#64748b)}
.mico-water{background:linear-gradient(135deg,#0e7490,#22d3ee)}
.mico-temp{background:linear-gradient(135deg,#ea580c,#fdba74)}
.mico-watt{background:linear-gradient(135deg,#7c3aed,#c4b5fd)}
.mico-lock{background:linear-gradient(135deg,#0f766e,#2dd4bf)}
.mico-fire{background:linear-gradient(135deg,#dc2626,#fb923c)}
.mico-vision{background:linear-gradient(135deg,#0891b2,#a7f3d0)}
.mico-parking{background:linear-gradient(135deg,#334155,#38bdf8)}
.mico-merchant{background:linear-gradient(135deg,#475569,#94a3b8)}
.mico-edge{background:linear-gradient(135deg,#0f172a,#14b8a6)}
footer{background:#0f172a;color:#94a3b8;padding:64px 0 32px;font-size:14px}
footer .wrap{max-width:1120px;margin:0 auto;padding:0 24px}
.fam{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:28px 0 36px}
.fam a{display:block;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12);border-radius:10px;padding:16px;transition:.2s}
.fam a:hover{background:rgba(255,255,255,.1);border-color:rgba(255,255,255,.35)}
.fam b{display:block;color:#e2e8f0;font-size:14.5px;margin-bottom:4px}
.fam small{font-size:12px}
.fam .cur{border-color:var(--accent-glow,#38bdf8);background:rgba(255,255,255,.12)}
.fam .cur b{color:#fff}
.copy{border-top:1px solid rgba(255,255,255,.1);padding-top:22px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:13px}
.copy a{color:inherit;text-decoration:underline}
@media(max-width:1100px){nav ul{gap:16px;font-size:13px}}
@media(max-width:860px){
  nav ul{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;border-bottom:1px solid #e2e8f0;flex-direction:column;gap:0;padding:8px 24px 16px;box-shadow:0 12px 24px rgba(0,0,0,.08)}
  nav ul.open{display:flex}
  nav ul a{padding:12px 4px;border-bottom:1px solid #e2e8f0;font-size:15px}
  nav ul li:last-child a{border-bottom:none}
  .burger{display:flex}
  nav .wrap{gap:6px}
  .logo{font-size:15px;min-width:0;overflow:hidden;text-overflow:ellipsis}
  .logo .mark{width:28px;height:28px;flex:none}
  .logo small{display:none}
  .lang{padding:6px 9px;font-size:12px;margin-right:2px}
  .nav-cta{padding:7px 12px;font-size:12.5px;white-space:nowrap}
  nav .dropmenu{display:block;position:static;transform:none;background:transparent;border:none;box-shadow:none;padding:0 0 2px 16px;min-width:0}
  nav .dropmenu a{padding:9px 2px;border-bottom:1px solid #e2e8f0!important}
  nav .dropmenu a:last-child{border-bottom:none!important}
  nav .caret{display:none}
  .fam{grid-template-columns:repeat(2,1fr)}
}