*{box-sizing:border-box}
body{margin:0;background:#f4f7f9;color:#18333b;font:15px system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif}
.top{background:linear-gradient(135deg,#087f8c,#19a7a0);color:#fff;padding:28px 18px}
.wrap{max-width:1050px;margin:auto;padding:0 14px}
.top-row{display:flex;align-items:flex-start;justify-content:space-between;gap:20px}
.brand{font-size:28px;font-weight:780}
.sub{opacity:.9;margin-top:4px}
.lang-select{width:auto;min-width:145px;margin:0;background:#fff}
.nav{margin-top:14px;display:flex;gap:8px;flex-wrap:wrap}
.nav a,.btn{display:inline-block;padding:10px 14px;border-radius:10px;text-decoration:none;font-weight:650;border:0;cursor:pointer}
.nav a{color:#fff;background:#ffffff20}
.btn{background:#078b93;color:#fff}
.btn-primary{background:#078b93;color:#fff}
.card{background:#fff;border-radius:16px;padding:20px;margin:18px 0;box-shadow:0 5px 20px #173d4a12}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:14px}
.device-tile,.sensor{background:#fff;border-radius:16px;padding:18px;box-shadow:0 5px 20px #173d4a12}
.device-name{font-size:20px;font-weight:750;margin-bottom:4px}
.device-head{display:flex;justify-content:space-between;gap:20px;align-items:flex-start}
.k{color:#70868c;font-size:13px;text-transform:uppercase;letter-spacing:.04em}
.v{font-size:28px;font-weight:750;margin-top:6px}
.status{font-weight:800;margin-top:8px}
.online{color:#079455}
.offline{color:#d92d20}
.muted{color:#70868c}
.notice{padding:12px 14px;border-radius:10px;background:#e8f6fb;color:#075985;margin:16px 0}
.err{background:#fee2e2;color:#991b1b}
label{display:block;font-weight:650;margin:14px 0 6px}
input,select{width:100%;max-width:500px;padding:11px 12px;border:1px solid #cbd8dc;border-radius:9px;background:#fff;color:#18333b;font:inherit}
.auth-card{max-width:520px;margin:32px auto}
.auth-switch{margin-top:18px}
.mode-msg{margin-left:8px;color:#70868c}
.warn{display:none;background:#fff6d8;color:#8a6200;padding:12px 14px;border-radius:10px;margin:12px 0;font-weight:700}
.table-scroll{overflow-x:auto}
table{width:100%;border-collapse:collapse}
th,td{padding:9px;border-bottom:1px solid #e4ecee;text-align:left}
td input[type=checkbox]{width:auto}
.footer{text-align:center;color:#7b8f94;padding:28px}
@media(max-width:600px){
  .top{padding:22px 14px}
  .top-row{flex-direction:column}
  .card{margin:12px 0;padding:15px}
  table{font-size:12px}
}